Boiler Knowledge

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

2022-05-14 16:04:17

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 14:58:16

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 17:36:12

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 16:10:08

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 15:33:26

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 15:31:17

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 15:17:53

Some effective energy saving and emission reduction measures for industrial steam boilers

In the boiler market, there are still some industrial steam boilers with low thermal efficiency, energy can not be effectively used, resulting in waste; boilers are old and the automatic control level is not high, which affects boiler combustion efficiency; energy conservation supervision is not in place, and many other problems. The industrial steam boiler launched by Zhengzhou Fangkuai Boiler Factory adopts the latest technology, which can not only improve the operating efficiency of the boiler, but also fully reduce the emission of pollutants, which is in line with my country's current sustainable development policy. At the same time, the boiler technical engineer of Zhengzhou Fangkuai Boiler Factory also summarized the following effective energy-saving and emission-reduction measures for industrial steam boilers.
       (1) Modification of fuel type. At present, the operating efficiency of coal-fired boilers can reach between 50-60%, while the efficiency of oil-fired gas-fired boilers can reach more than 90%. Although the unit price of oil and gas fuel is more expensive than that of coal, in general, it is still The use of oil and gas boilers is more energy-saving and money-saving.
       (2) Reform the combustion system. Adding full premixing or FGR combustion technology to the boiler to reuse the fuel heat energy can not only reduce the temperature of the flue gas emitted, but also allow the fuel to be more fully utilized.
       (3) The use of frequency conversion technology to transform boiler auxiliary equipment.
       (4) The automatic control system is adopted to adjust the output heat of the boiler in real time to achieve the purpose of energy saving. (5) Recover condensed water.
       (6) The boiler is updated and replaced with a new boiler to replace the old boiler.

2021-11-19 15:16:22

Properly use softened water treatment to extend the service life of industrial boilers at least 5 ye

For the water flowing into the industrial boiler, it must be softened, which can effectively reduce the formation of scale, which is good for the long-term operation of the boiler. The Zhengzhou Fangkuai Boiler Factory said that the correct use of softened water treatment prolongs the service life of industrial boilers by at least 5 years.

There are many ways to soften industrial boiler water, but the most common method is ion exchange. The characteristic of ion exchangers is that the resin must be regenerated frequently;

A. When the hardness of the effluent water exceeds the standard, it must be stopped and regenerated;

B. The method of cation resin regeneration is to soak the resin in salt water for about two hours, let the salt water dry, and then backflush with clean water, you can continue to use it;

C. The method of judging whether the exchange resin is invalid (when must be regenerated) is very simple:

Wash your hands with a piece of soap in the raw water (water before treatment). Use the same method to wash your hands in the finished water after treatment. Compare the feel of the two washes. If the water is soft, the hands are very slippery, and the soap always washes. No, the processor is normal at this time and does not need to be regenerated. On the contrary, if the two feels are the same, it means that the processor has failed and can be regenerated at this time.


D. Other types of processors can also use this method to adjust the amount of salt or other regeneration parameters.

2021-11-17 15:16:02

What are the more mainstream boiler equipment in use now?

There are many types of boilers, which are used in various industries and have corresponding uses and characteristics. What are the more mainstream boiler equipment currently in use? How to choose a boiler as a boiler user? Zhengzhou Fangkuai Boiler Factory summarizes the following types of boiler equipment.

1. Oil and gas boiler
       Advantages: Efficient, clean, environmentally friendly, no manual operation is required, only monitoring is required, less area, no transportation fuel, no need to dispose of coal ash, because natural gas is burned without impurities, there is no corrosion to the boiler and related accessories, and the boiler has a long life , The stipulation is 15 years, but basically it can be used for a long time. It is now the mainstream boiler, and natural gas is also vigorously promoted by the environmental protection department and the government.

2. Coal-fired boiler
       Advantages: The boiler purchase cost is low.
       Disadvantages: 1. Coal yard and coal ash require a large amount of land.
       2. Furnace workers need 4 to 8 people for a boiler.
       3. The boiler room and coal yard are very dirty.
       4. It is noisy and emits a lot of dust, which disturbs the people.
       5. The environmental protection department will often come to check. If you don't pay attention, it will be found that the emission exceeds the standard, the furnace will be shut down for maintenance, and the fine will be very troublesome.
       6. Coal contains a lot of sulphur, which corrodes the boiler heavily, and it is basically unusable after 10 to 15 years.

Coal-fired boilers have serious air pollution. As the country pays more and more attention to environmental protection issues, the emission requirements for coal-fired boilers are stricter. Many urban areas have stopped the approval procedures for coal-fired boilers.

Therefore, Zhengzhou Fangkuai Boiler Factory still recommends that you install a natural gas boiler. Although you use a little more fuel cost, in the actual operation process, you can save a lot of things, while saving land, and the environment is clean.

2021-11-15 15:14:00