News information

The role of each part of the boiler body

1. Drum: The function of the drum is to collect, store, purify steam and make up water. The drum of the hot water boiler is filled with hot water, while the lower drum of the steam boiler is filled with hot water, the lower part of the upper drum is hot water, the upper part is the steam space, the surface of the water is called the water surface, and the location of the steam-water boundary is called water line.

2. Water cooling wall: The cooling wall is the radiant heating surface arranged around the furnace. It is the main heating surface of the boiler.

3. Convection tube bundle: The flow tube bundle is the convection heating surface of the boiler. It absorbs the heat of high temperature flue gas, and the heat absorption is related to the flow rate of flue gas, the arrangement of pipes, and the way of flue gas flushing.

4. Descending pipe: The main function is to transport the water in the drum to the lower header, so that the heating surface pipe has enough circulating water to ensure reliable operation.

5. Header: It mainly collects and distributes pot water to ensure reliable water supply for each heating surface pipe or to collect water or soda mixture from each pipe. Generally, the header should not be exposed to radiant heat to avoid the generation of internal water. Bubble cooling is not good, overheating burns out.

6. Superheater: The superheater is the auxiliary heating surface of the steam boiler. Its function is to draw saturated steam from the upper drum under the condition of constant pressure, and then heat it to evaporate the water in the saturated steam and make the steam temperature. Raise, improve steam quality, become superheated steam.

7. Coal economizer: The coal economizer is a heat exchanger that is arranged in the flue at the tail of the boiler and uses the waste heat of the exhaust gas temperature to increase the temperature of the feed water. Generally speaking, every time the water temperature at the outlet of the economizer increases by 1°C, the exhaust gas temperature of the boiler decreases by 2-3°C on average, and the feed water temperature does not increase by 6-7°C. Save 1% of coal, and generally, boilers equipped with economizers can save 5-10% of coal.

Any parts of the boiler can be found at https://www.boilermanufactory.com/products/parts/

2022-05-14

Comparison of Atmospheric Pressure Hot Water Boiler and Vacuum Hot Water Boiler

Basic Principles

1. Atmospheric pressure hot water boiler

Atmospheric pressure hot water boiler is also called non-pressure hot water boiler. The drum is filled with water and heated by direct combustion in the furnace to form hot water. It belongs to the category of civil domestic boilers. The atmospheric pressure hot water boiler is a non-pressure hot water boiler with an air vent on the top and the boiler body is always in a normal pressure operation state. Its main feature is that the boiler is not under pressure and has no potential safety hazards. , mainly used for heating and production of hot water, is one of our more common boiler varieties.

Advantages: simple to manufacture and easy to install; the boiler is directly vented to the atmosphere, which is safer than the pressure boiler;

Disadvantages: The boiler system cannot directly supply heat because it cannot bear pressure. It needs to be equipped with accessories such as external heat exchangers. The cost of the system is high; the startup is slow and the preheating time is long; after the boiler is scaled, the thermal efficiency decreases year by year, and the service life generally does not exceed 8-10 year;

2. Vacuum hot water boiler

The vacuum boiler forms a negative pressure vacuum environment inside the closed furnace body, and fills the heat medium water in the body. The heat medium water is heated by combustion or other methods, and the heat medium water is heated to generate steam, and the steam heats the water in the heat exchanger tubes through condensation heat exchange to realize the supply of hot water.

Advantages: high thermal efficiency, the boiler will never scale, and achieve semi-permanent life (more than 20 years); fast start-up, small preheating loss; multi-channel water supply, multi-purpose for one machine; negative pressure operation, safer.

Disadvantages: high manufacturing requirements; hot water outlet temperature up to 90 ℃.

Comparison of heating systems

1. The hot water supply system of the atmospheric hot water boiler is adopted:

According to the current national standards and specifications, the atmospheric pressure hot water boiler is not allowed to bear pressure when it is in operation. In order to meet the usage requirements when the heating system is running, it can only be made up by configuring other auxiliary equipment in the system to make it perfect. System Features:

a. The system is complex, with many equipment and control systems, which are prone to failures and cumbersome operations (requires full-time personnel);

b. There are many auxiliary equipment, high installation requirements, large floor space, and increased initial investment;

c. The number of intermediate heat exchanges is large, the heat loss of the system is large, the operating cost is high, and the thermal efficiency of the system is low (about 80%);

d. The maintenance cost is high, and the service life of the boiler equipment is short (about 8 years);

e. The water temperature of the hot water tank cannot be controlled, the water temperature is not constant, and the water temperature of the hot water supply system fluctuates greatly.

2. The hot water supply system of vacuum hot water unit is adopted:

According to the structural characteristics of the vacuum hot water unit, the state expressly stipulates that it is not a special equipment, can withstand pressure (standard pressure 1.0Mpa) during operation, and can be directly connected to the system for use. System Features:

a. The system is simple and reliable, and the operation is convenient (unmanned operation is possible);

b. Less equipment configuration, low installation requirements, small footprint, and low initial investment;

c. The intermediate heat exchange loss is almost zero, the operating cost is low, and the thermal efficiency of the system is high (over 90%);

d. Maintenance is simple, the cost is low, and the service life of the unit equipment is long (up to 20 years);

e. Automatic constant temperature water supply, high quality hot water.
 

2022-04-29

What are the functions of industrial steam boilers? How does a steam boiler work?

Nowadays, with the rapid development of the industry, the scope of application of steam boilers in the industry is becoming more and more extensive. Today, what the editor wants to introduce to you is what are the functions of steam boilers? Follow me below to find out!

How a steam boiler works:
Its working principle is that the heating equipment releases heat, which is absorbed by the water-cooled wall through radiation heat transfer, and the water in the water-cooled wall boils and vaporizes, generating a large amount of steam into the steam drum for steam-water separation, and the separated saturated steam enters the superheater. The method continues to absorb the heat of the flue gas protecting the top of the furnace, the horizontal flue and the tail flue, and makes the superheated steam reach the required working temperature.

A simple understanding is to boil hot water, the pot is equal to the kettle for water, the stove is equal to the stove to burn fuel, and the water in the pot absorbs the heat energy after the fuel is burned in the furnace and converts it into steam.

steam boiler

The role of the steam boiler:
Steam boilers can play an important role in production and daily life. Steam boilers have a sterilizing effect in food processing, medical industry and canning industry.

In the school canteen, food processing, brewing and other industries, the function of the steam boiler is to steam the food, and it can also steam the embryo for brewing.

In school bathhouses, students' daily drinking hot water, hotel hot water supply, hotel hot water supply, bathing halls and other places, the function of the steam boiler is to exchange the heat of the steam to the water through the heat exchanger. After heating the water, there are heating, hot water supply, bathing, production, etc.

In refineries, chemical plants and other places, steam boilers can increase fluidity by heating them. Steam boilers are also used in their production.

In addition to the above points, the use of steam boilers in the production industry is also very extensive.

Precautions for using steam boilers:
Units using steam boilers also need to pay attention that steam boilers must be inspected every year. Only if the inspection results of the relevant departments are qualified, they can continue to be used. If they are not qualified, they will be required to be replaced.

The annual inspection of the steam boiler is mainly to check the condition of the drum. There is no bulge in the drum, and the pit depth of oxygen corrosion does not exceed the specified value.

The above is the relevant information about the steam boiler brought to you today. I hope it will help you to understand the boiler and learn more about the boiler. Follow the Fangkuai Boiler website to show you more about the boiler.

2022-04-11

For steam boilers, what does "evaporation capacity" mean?

When purchasing a steam boiler, it is best for users to have a certain understanding of the various parameters of the boiler. This will not only ensure that the appropriate boiler model is purchased, but also will not be deceived by bad boiler manufacturers and lose costs in vain. For steam boilers, "evaporation capacity" is a relatively important parameter, Zhengzhou Fangkuai Boiler Factory will come to show you.

The amount of steam produced by a steam boiler per hour is called the boiler’s evaporation, also known as "output" or "capacity". It is represented by the symbol "D", and the commonly used unit is t/h.
       The boiler evaporation capacity is divided into rated evaporation capacity, economic evaporation capacity and maximum continuous evaporation capacity.
       (1) Rated evaporating capacity The steam boiler uses the fuel specified in the design under the rated steam pressure, the rated steam temperature, and the rated feed water temperature, and the evaporative capacity per hour specified when the efficiency is guaranteed. The evaporation capacity indicated on the metal nameplate of the boiler product is the rated evaporation capacity of the boiler.
       (2) Economic evaporation capacity In continuous operation of the steam boiler, the evaporation capacity at the highest efficiency is called economic evaporation capacity. The economic evaporation is about 75% to 80% of the rated evaporation.
       (3) Maximum continuous evaporation The maximum evaporation that the steam boiler can achieve during long-term continuous operation under the conditions of rated steam parameters, rated feed water temperature and use of the designed fuel is called the maximum continuous evaporation. At this time, the efficiency of the boiler will be reduced, so try to avoid the boiler running under the maximum continuous evaporation capacity.

2021-11-29

What types of boiler equipment are available on the market?

Boiler equipment has played an important role in the development of our country. Nowadays, there are many kinds of boiler equipment on the market, and many users and friends will inevitably not know how to choose. Zhengzhou Fangkuai Boiler Factory has summarized the following classification of boilers for your reference and understanding.

1. Classified by boiler purpose
       Divided into thermal power boilers and heating boilers. Power boilers include power station boilers, ship boilers and locomotive boilers, etc., which are used for power generation, ship power and locomotive power accordingly. Heating boilers include steam boilers, hot water boilers, heat pipe boilers, hot blast stoves and heating medium heating furnaces, etc., and obtain steam and hot water accordingly. Hot air and heating medium, etc.

2. Classified by boiler body structure
       Mainly divided into fire tube boilers and water tube boilers. Fire tube boilers include vertical boilers and horizontal boilers, and water tube boilers include horizontal water tube boilers and vertical water tube boilers.

3. Classified by the type of fuel used in the boiler
       Divided into coal-fired boilers, oil-fired boilers and gas-fired boilers, as well as pulverized coal boilers, gas dual-purpose boilers. Coal-fired boilers can be divided into layer-fired boilers, room-fired boilers and boiling boilers according to their combustion methods.

4. Classified by boiler capacity
       Those with an evaporation capacity of less than 20t/h are called small boilers, those with an evaporation capacity of more than 75t/h are called large boilers, and those with an evaporation capacity between the two are called medium-sized boilers.

5. Classified by boiler pressure
       Boilers below 2.5MPa are called low-pressure boilers, those above 6.0MPa are called high-pressure boilers, and those with a pressure between the two are called medium-pressure boilers. In addition, there are ultra-high pressure boilers, subcritical boilers and supercritical boilers.

6. Classified by boiler water circulation form
       Divided into natural circulation boilers and forced circulation boilers (including once-through boilers).

7. Classified by device form
       Divided into quick-installed boilers, assembled boilers and bulk boilers. In addition, there are wall-mounted boilers, vacuum boilers and modular boilers.

 

2021-11-27

What type of hot water boiler is better for greenhouse planting?

Greenhouse planting technology allows us to eat green vegetables even in the cold winter, and one of the equipment to ensure that the greenhouse can still maintain a constant temperature in winter is the hot water boiler. Only one easy-to-use hot water boiler can maintain the needs of all the greenhouses throughout the winter, allowing users to worry and rest assured. What type of hot water boiler is better for greenhouse planting? The professional Zhengzhou Fangkuai boiler manufacturer will answer for you.

Generally speaking, the capacity of the hot water boiler should be determined according to the area of ​​the greenhouse, so that the appropriate boiler equipment can be purchased. At the same time, it is necessary to choose the model of the hot water boiler according to the structure of its own boiler room, whether it is horizontal or vertical. Of course, the operating efficiency of the boiler cannot be ignored. A good hot water boiler has a very high operating efficiency. It can save at least one hundred thousand to several hundred thousand yuan in fuel costs over the entire winter.

Therefore, Zhengzhou Fangkuai Boiler Factory recommends that if you need to use a hot water boiler, it is best to contact a professional boiler manufacturer, and its skilled boiler engineer will formulate a detailed boiler systemization plan, including auxiliary equipment and boiler room layout. , Quotation and more information.

At the same time, everyone should pay attention to the fire separation range when designing the boiler room.
       1. The boiler room is a Category D production plant. When the rated evaporation capacity of the steam boiler is greater than 4t/h, and the rated output of the hot water boiler is greater than 2.8MW, the boiler room building should not be lower than the Class II fire resistance level; the rated evaporation capacity of the steam boiler is less than or equal to When the rated output of 4t/h and hot water boiler is less than or equal to 2.8MW, the boiler room building shall not be lower than the third-class fire resistance level;
       2. The oil tank room, the oil pump room and the oil heater room are all category C production plants, and their buildings should not be lower than the second-class fire resistance level. When the above rooms are arranged in the auxiliary rooms of the boiler room, a firewall should be set up to separate them from other rooms;
       3. The gas pressure regulating room is a Class A production plant, and its building should not be lower than the second fire resistance level. The pressure regulating room adjacent to the boiler room should be separated from the boiler room by a firewall, and its doors and windows should be opened outwards. Directly lead to the boiler room, and the floor should be a non-sparking floor.

2021-11-25

What is the difference between a hot water boiler and a steam boiler? How to choose suitable boiler

Hot water boilers and steam boilers are relatively common boiler equipment on the market at present, and the output media of the two are different, and the application places are also different. Hot water boilers are more suitable for air conditioners, heaters, low temperature ovens, drying equipment, hot water tanks for textile printing and dyeing, and various low temperature heating, air conditioning coils and heat exchange equipment. Steam boilers are suitable for industrial sites such as chemicals, building materials, and food processing. What is the difference between a hot water boiler and a steam boiler? How to choose suitable boiler equipment as a user? Zhengzhou Fangkuai Boiler Factory will answer for you.

1. Hot water boilers generally have a low heat medium temperature and a large temperature difference with the flue gas. The boiler exhaust gas temperature is relatively low, so the efficiency of the boiler will be higher.

2. The hot water boiler adopts a closed hot water system, the amount of make-up water is small, the blowdown rate is much smaller than that of the steam boiler, and the water waste is also small. In addition, the boiler water quality requirements are low, and the water treatment costs are low.

3. The heat capacity of the water in the hot water boiler is large, the hot water capacity in the system is large, and the heat storage capacity is strong. When the thermal or hydraulic operating conditions fail for a short time, it will not cause significant fluctuations in the heating conditions.

4. The hot water heating system can be pumped for long-distance transportation, with small heat loss and large heating radius, which can meet the requirements of urban central heating planning.

2021-11-21

The development of social science and technology and technical means has promoted the rapid development of the breeding industry. People obtain meat, eggs, milk, wool, cashmere, hides, silk and medicinal materials from poultry such as chickens, ducks and geese through artificial breeding. For many farms, maintaining a constant temperature living environment for poultry is a top priority.
 
How to choose the type of hot water boiler for heat preservation in farms, Fangkuai Boiler can give you the most sincere guidance and advice.
 
Taking a shrimp farm as an example, we will focus on how users in the aquaculture industry should choose suitable hot water boilers.
 
Generally speaking, shrimp farming requires "cold water", but this "cold water" refers to the natural water temperature in a normal environment, that is, a temperature between 10-20 °C. However, in winter, it is necessary to start the hot water boiler equipment to maintain the temperature of the shrimp pond and ensure that the shrimp can survive normally.
 
In order to meet the needs of the livestock for the environment and diet, a device that can output heat in a lasting and stable manner is required. We can see that in many large farms, one or several steam or hot water boilers will be equipped for the livestock of the farm.
 
The shrimp farm that cooperated with Fangkuai Boiler this time needs to use a boiler to maintain the constant temperature of the shrimp pond. According to the knowledge of Fangkuai boiler sales consultant, the shrimp farm has a total pool volume of 20 tons. The boiler is mainly used in winter, and the water at subzero temperature needs to be heated to about 10°C. After calculation, the technicians of Fangkuai Boiler concluded that a half-ton atmospheric pressure hot water boiler can meet their needs. For this reason, we provided a boiler with an output of 0.35MW (that is, a half-ton capacity). Atmospheric pressure vertical gas hot water boiler (CLSH0.35-95/70-Q). The adjusted hot water boiler can maintain a temperature difference of 14°C between the inlet and outlet water and maintain a constant temperature in the shrimp farm's pool. Combined with the actual situation of the user's project site, the natural gas interface has not yet been connected to the local area. We have customized a plan for using liquefied petroleum gas. The fuel is transported through canned transportation. There is no need to specially prepare a fuel storage site, and it is very clean and convenient to use.
 

Guidance Scheme for Selection of Hot Water Boilers for Thermal Insulation of Farms

According to the structural design, the use of atmospheric hot water boilers should be of no risk. This is mainly due to the fact that the top of the atmospheric hot water boiler is open to the atmosphere, and the internal pressure is always the same as the outside. Many residential and breeding centers choose to use this type of boiler.

Although the safety of atmospheric pressure hot water boilers is very high, this does not mean that the furnace personnel can be negligent. A relatively old steam boiler located in a fish farm in Wangtan Village, Rudong Town, Rudong County, exploded due to improper operation of the boiler operator.

When using a normal pressure hot water boiler, pay attention to the regular observation of the water level to avoid low water level and dry burning. Otherwise, there will be certain dangers, and the service life of the boiler will be seriously reduced. Boiler operators should pay attention to the following matters:
       1. Strictly implement various rules and regulations, earnestly study the professional knowledge of boilers, continuously improve the level, and ensure the safe and economic operation of boilers.
       2. After the normal pressure hot water boiler is put into use, the unit and individual may not change the boiler structure, valve and pipeline system without authorization.
       3. Inspect and inspect various equipments according to regulations before taking over, including: water level of water tank (hot water tank, expansion water tank), energy consumption (boiler gas meter), thermometer (hot water tank temperature, boiler heat medium water temperature), etc. Check the operation records, check the equipment, and learn more about the boiler operation when you transfer the shift.
       4. The succession personnel will go to the boiler room in advance to prepare for the work according to the regulations, shifts and prescribed time, and understand the boiler operation.
       5. The shifter should prepare in advance, carry out serious and comprehensive inspections and investigations, and keep the boiler running normally.
       6. The shifting staff should introduce the relevant problems of equipment operation, water quality and boiler discharge to the successor. If the handover procedure is not completed, the handover personnel must not leave the job. 7. Keep the boiler body clean when the boiler is running, no dirt, no leakage, no rust and corrosion, and fill in the equipment maintenance record carefully and in detail.
       8. The boiler room is one of the key departments of the boiler unit. Except for the boiler room staff, relevant leaders, and safety, security, and department management personnel, other personnel are not allowed to enter without permission.
       9. It is forbidden to store inflammable, explosive and other miscellaneous items in the boiler room. It is necessary to install oil drums and oil pots with a small amount of lubricating oil and cleaning oil. Store them at the designated place and pay attention to check whether there is explosives in the burning.
       10. The boiler room should be equipped with fire-fighting equipment, carefully managed, do not move or use it for other purposes.
       11. The floor, walls, doors and windows of the boiler room are always kept clean and hygienic.
       12. The supervisors should check the operation records and environmental sanitation regularly and irregularly, find problems and solve them in time.
       13. Go to work on time according to the prescribed time, do a good job of shifting records, and do not leave the job casually.
       14. It is strictly forbidden to drink alcohol, sleep, gamble, and fight in the boiler room.
       15. After equipment failures and accidents are reported in time (timely reported to the person in charge at night), the written accident report is written in a realistic manner. After the investigation is clear, after the responsibility is clarified, the accidental loss is caused to the dereliction of duty, and the responsibility is handled.

How to make the normal pressure hot water boiler operate safely?

There are three reasons for the explosion of a gas boiler: gas (fuel), air and heat. Once the three reach a certain level, it is not far from the explosion of the boiler.

The key to preventing the explosion of gas boilers is to prevent the three from reaching certain limits at the same time. Among them, air is ubiquitous, it is very difficult to remove this condition, so the focus of explosion-proof is concentrated on gas and heat sources. Therefore, almost all gas explosion-proof technologies at this stage focus on how to treat gas and heat sources.

A large number of accidents indicate that the explosion of the gas boiler boiler or flue site is caused by the accumulation of gas and air in the furnace or flue, and the fire or high-temperature heat source. The combustible mixture is obviously mixed with air from the air. Forming. Therefore, the core of preventing gas boiler explosion is to prevent the boiler from entering the furnace when it is not running (no flame in the furnace); and it should be noted that the boiler must be "fire and other gas" when it starts, that is, the gas is first supplied and then ignited to form a heat source.

To this end, "Steam Boiler Safety Technical Supervision Regulations" and "Hot Water Boiler Safety Technical Supervision Regulations" clearly stipulate that: gas (including fuel, pulverized coal) boilers must be equipped with reliable ignition program control and flameout protection devices; Explosion-proof doors should also be installed in inflammable and explosive parts such as furnaces and flue ducts. The first half of the regulation is actually based on the mechanism of the explosion to prevent the formation of a mixture of gas and air, and to ensure the realization of "fire and other gas"; the latter part is used as a remedy, once the furnace or flue explosion, through the explosion-proof door Reduce the damage caused by the explosion.

How to prevent gas boiler explosion?

Pickling is the main method for removing a large amount of oxidizing substances and corrosion products inside a gas boiler, and also has the effect of eliminating scale. The pickling process is usually carried out after 1-3 weeks of boiler operation. FANGKUAI Boiler summarizes the steps of boiler pickling for your reference and understanding.

First, cleaning tools
       Boiler energy saver, steam drum, water wall, hydrochloric acid, ammonium bifluoride.

Second, the cleaning method
       1. First, at the beginning of the pickling work, the boiler's economizer, steam drum and water wall are filled with demineralized water.
       2. The boiler is ignited. When the temperature of the boiler rises to 70-80 ° C, the boiler is turned off, and then the pickling operation can be performed. Before the pickling operation, the superheater should also be recharged with demineralized water until the water overflows into the steam drum to prevent acid or acid vapor from being introduced into the superheater.
       3. When the acid is charged into the boiler, the boiler should not be ignited under any circumstances. The steam drum and other venting holes should be opened to remove the hydrogen generated by the reaction of acid and iron. Before making sure that the hydrogen has dissipated, avoid open flames or use electrical equipment that generates sparks to avoid the risk of hydrogen explosion.
       4. Finally, after the acid filling is completed, let the boiler and economizer soak for about 6 hours in the solution, then drain the acid and rinse the superheater with demineralized water. The acid is discharged. After the acid is drained, the boiler feed water pump is operated, and the water of one economizer is filled into the boiler to prevent the water supply shutoff valve from leaking.

Third, matters needing attention
       The gas boiler can be pickled with 5% hydrochloric acid with 0.25% ammonium difluoride inhibitor added. The acid solution is injected into the boiler through the pickling joint on the steam drum down pipe, and the acid filling of the economizer is carried out through the recirculation pipe. The filling of the acid solution should be carried out until the liquid level in the steam drum temporary water level gauge rises significantly until the liquid level rises above the cyclone separator, but it should be noted that the acid liquid cannot enter the superheater, otherwise it will cause serious damage.

How to clean the gas boiler?

After the electric hot water boiler is out of service, it is necessary to carry out corresponding maintenance work to prevent corrosion problems inside and outside the furnace. So, do you know how to maintain the electric hot water boiler after it is shut down?

1. After the electric hot water boiler is shut down for cooling, completely remove the ash from the heated surface and the ash from the upper part of the grate and the lower part of the furnace.

2. Keep the flue has a certain natural ventilation. Under normal circumstances, in order to prevent moisture, desiccant should be placed in the furnace and flue. If quicklime is used as the desiccant, it is necessary to place about 3 kg of quicklime per cubic meter of furnace or flue. After placing, all the ventilation doors should be closed tightly. The quicklime turns pink and needs to be replaced. If the location of the boiler room is low, and the ground flooding is severe during the shutdown, the combination of frequent low-fire baking and desiccant should be used. If the boiler is shut down for a long time, red sand oil or other anti-corrosive paint is applied to the outer surface of the furnace metal after the soot is completely removed.

3. As for the anti-corrosion maintenance method of stopping the furnace inside the furnace, it is determined according to the length of the shutdown time. Under normal circumstances, the furnace can be shut down for more than one month of available wet maintenance, and more than one month should be dry maintenance.

Wet maintenance is suitable for electric hot water boilers with a shutdown period of no more than one month. After the furnace is stopped, the boiler water is discharged, cleaned and filled with clean water, the power is cut off, and the valve is closed.

Dry maintenance means that after the furnace is shut down, the boiler water is released, the dirt in the furnace is washed out, the boiler is dried with a burner, and then all the boiler gases are drained, and all the pipeline valves are closed every three months. Check once.

How to maintain the electric hot water boiler after stopping the furnace?