Gas-fired steam boilers are the first choice for many industries such as food processing, paper making, brewing, and chemical production. In the current boiler market, gas-fired steam boiler technology has been very advanced, with obvious advantages of stable operation and low energy discharge and energy saving. If you do not use it for a long time, you must use the correct maintenance method to maintain normal operation during subsequent startups.

The gas steam boiler is not used, the specific maintenance method and the square boiler are carefully analyzed.

1. dry maintenance
       The gas-fired boiler needs to be drained after the furnace is shut down, then the internal dirt is completely removed and rinsed, and the drying in the furnace is kept so as not to be eroded.
       You can use a small fire when drying the remaining water in the furnace, but you should not use a large fire. Also be careful to close all the hand hole pipe valves and place the quicklime pan in the drum.
       If you have not used a gas steam boiler for a long time, check the boiler at least three months. If the quicklime in the crucible is broken into powder, it is necessary to replace the new lime in time to ensure that the dryness protection in the gas steam boiler is not corroded by moisture.

2. wet maintenance
       The specific operation procedure of the wet maintenance is: after the water in the furnace is discharged, the internal dirt is removed, and the treated water is filled into the crucible and then heated to the required temperature; then the gas in the water is completely discharged to the furnace. In addition, close all valves. However, it should be noted that when the weather is very cold, wet maintenance should not be used to prevent the furnace water from freezing and damaging the furnace and cannot be used.

It can be seen that the gas steam boiler can be used in both dry and wet methods without being used. The specific maintenance method should be flexibly selected according to different sites and climatic conditions, which is also for normal use in the future. "Protect the escort."

The condensing boiler can recover the residual heat in the high-temperature flue gas of the boiler and the latent heat part of the condensation of water vapor in the flue gas, thereby improving the use efficiency and reducing the harmful gases in the flue gas, so it will soon become the boiler technology. Future development direction. Driven by this new form, consumers are also buying condensing boilers. What should consumers pay attention to during the life of the condensing boiler?

First, pay attention to cleaning.
       The main function of the pickling inhibitor during the cleaning process is to prevent the metal from being corroded during the pickling process of the condensing boiler. In most cases, many people choose to use the eyes to check whether the cleaning of the condensing boiler is qualified. However, visual inspection can only see if the cleaning is clean, ignoring the most important indicators of cleaning - corrosion rate and corrosion. The corrosion rate and the amount of corrosion are not visible to the naked eye. Therefore, consumers should also understand the measurement method of corrosion rate and corrosion amount; in the cleaning process, use the cycle mode of lowering up or going up or going up and down, installing temporary cleaning circulation pipelines in multiple positions, so that the pots and drums, steam drums, The pyrotechnic tube, the ascending tube, the descending tube and the header can be circulated by the cleaning pump to maintain a balanced concentration of the cleaning liquid, which enables the insoluble matter to be discharged from the boiler after the cleaning is completed, thereby preventing a large amount of dirt from falling off and causing the boiler to burst. Tube "accident.

Second, When one of the following conditions occurs during the operation of the condensing boiler, it should be immediately shut down.
       The water level of the condensing boiler is lower than the lowest visible edge of the water level table; the water supply is continuously increased and other measures are taken, but the water level continues to drop; the water level of the condensing boiler exceeds the highest visible water level of the water level table, and the water level cannot be seen after the water is discharged; all the water pumps fail or water supply In case of system failure, water cannot be supplied to the condensing boiler; the condensing boiler water level gauge or safety valve is completely ineffective; the condensing boiler components are damaged and endanger the safety of the operating personnel.

Therefore, when consumers choose and use the factory direct condensing boiler, not only need to follow the instructions for the operation of the standard, but also need to pay more attention to the precautions in the use of the condensing boiler, so that consumers can use the condensing boiler The process is double-insurance to avoid risks during the operation.

“Coal to electricity” has become a very frequent project in the boiler market. Many users will feel confused when they first contact the boiler “coal to electricity” project. In fact, in order to smoothly carry out coal-to-electric boilers, it is necessary to grasp a series of precautions for coal-to-electric boilers; this will help improve the efficiency of boiler operation after successful transformation, and on the other hand, it can be used for boiler operators. The personal safety is increased, and FANGKUAI Boiler will come to introduce three key points in the process of coal-to-electric boilers.

First, pay attention to the planning and laying of circuit lines
       When using electric energy, each line needs to have certain independence between each line. In order to ensure that the electric boiler after the transformation does not have poor contact due to the electric wire problem, it has to have good circuit circuit planning and laying. This requires professional personnel to operate. Coal-to-electric boiler manufacturers with perfect after-sale conditions generally provide excellent services in this regard.

Second, pay attention to the installation of the electric boiler should be stable enough
       The use of boilers has certain dangers. The use of electric energy as energy source after the boiler is changed to coal can greatly increase the safety factor of use. However, when the electric boiler is installed, it is still necessary to ensure the stability of installation and install the foundation. It is also necessary to maintain a certain level of flatness so as not to have a bad influence on the electric boiler, especially in the place connected to the ground, to be adequately prepared to prevent accidents during use.

Third, pay attention to measures to prevent electric shock
       The threat of electricity to people is still relatively large. Once a person has a shocking effect, it is unimaginable. Therefore, a good quality electric boiler must pay attention to the measures to prevent electric shock. This is directly related to the personal safety of the boiler operator. Therefore, it is necessary to give full attention to the conversion of coal to electric boilers. The efficiency of coal-to-electric boilers is very important, but the improvement of efficiency must always be based on safety.

In the process of coal-to-electric boilers, we must carefully master the "coal to electricity" skills, in order to ensure that the electric boiler can play the most important role and ensure equipment and personal safety. The above is the boiler 'coal to electricity' tips that FANGKUAI Boiler will provide for you, and hope to help you carry out the boiler renovation project more smoothly.

When and under what conditions, the hydraulic pressure test, the main steps of the water pressure test, there are many techniques and techniques.

With many years of boiler experience, FANGKUAI Boiler has summarized the following dry goods for your reading and reference.

First, When do you need to carry out boiler water pressure test?
       1. When the newly installed boiler is put into operation.
       2. When the boiler that has been out of service for more than one year is restored to operation.
       3. After the boiler is rebuilt and the pressure components are repaired or replaced, if the number of water wall replacement tubes is more than 50%, the superheater, reheater, economizer and other components are replaced in groups, and the steam drum is undergoing major repairs. Time.
       4. When the boiler is overpressured to 1.25 times working pressure and above.
       5. When the boiler is seriously deficient in water and the heating surface is deformed in a large area.
       6. According to the operation situation, there is doubt about the safety and reliability of equipment operation.

Second, the boiler water pressure test method
       1. The water pressure test should be carried out when the ambient temperature is higher than 5 °C. When it is lower than 5 °C, anti-freezing measures must be taken.
       2. The water used for the hydraulic test should be kept above the ambient dew point to prevent condensation on the surface of the boiler. It may be confused with the inconsistency of water seepage and increase the inspection difficulty. However, it is not suitable for the temperature to be too high to prevent vaporization. (It is difficult to find the leak) and excessive temperature difference stress, generally 20 ° C ~ 70 ° C.
       3. After the water is full, gradually increase the pressure to 0.4MPa, that is, perform a strict inspection. If necessary, tighten the bolts of the flange, manhole door and hand hole cover.
       4. During the water pressure test, the water pressure should be slowly raised and lowered. When the water pressure rises to the working pressure, the pressure should be suspended, check for water leakage or abnormality, and then boost to the test pressure for 20 minutes. There is no drop, that is, it is reduced to the working pressure for inspection.
       5. Any leaks should be recorded to reduce the pressure to atmospheric pressure.

The above is the skill that FANGKUAI Boiler needs to master when comparing the more comprehensive boiler water pressure test. I hope it can help you.

The application of pressureless boilers is very extensive, and it has the advantages of safety and low explosion risk compared with pressurized boilers.

This is because the top of the pressureless boiler is directly connected to the atmosphere and does not withstand the static pressure of the water column of the heating system. It can also be understood as an "open hot water tank".

There are three distinct advantages of a pressureless boiler, mainly:

       1. the operation is absolutely safe and reliable. The biggest advantage of a pressureless boiler is that it is not subjected to pressure during operation and there is no risk of explosion.
       2. Save steel and simplify the process. The pressureless boiler has low material requirements. Except for the furnace, the other uses cheaper ordinary carbon steel materials. The welding process can meet the strength requirements by using fillet welds, which not only saves welding materials, but also simplifies the process.
       3. It is well known that the main scale of boilers is sulfate and silicate. These two types of scales decrease with the evaporation of water and reach a certain level (saturated concentration). The water temperature of the pressureless boiler is kept at around 95 °C for many years, which is not limited by the saturation temperature, and the scale is not easy to form. Therefore, the pressureless boiler also has the advantage of being less prone to fouling, thereby eliminating unnecessary water treatment devices.

 

But this is not to say that the pressureless boiler has no special attention when it is running. On the contrary, the pressureless boiler should pay attention to many details when it is running.
       1. the system water
       The heating system should be equipped with a high-level bearing box, which is located at the high point of the system. The rainwater system is connected to the return pipe and is filled into the system through the tap water pressure. At the same time, the system discharge is normal, so that the system can replenish water. After the high water tank overflows, the water pump cycle is started. Replenish water until the system is full.
       2. Check the activation valve before running
       Firstly, the valve of the boiler inlet and outlet is opened, and the circulating water pump is turned on to make the system circulate and flow to check whether the automatic opening and closing valve is sensitive. Then the circulating water pump stops running for 1-2 hours, paying attention to the water level of the boiler.
       If the water level changes little here, the automatic opening and closing valve of the table name is closed tightly. If the boiler water level rises rapidly after stopping the pump, it indicates that the automatic opening and closing valve leaks seriously and needs to be repaired or replaced in time.
       When the automatic opening and closing valve fails or the leakage is serious, it cannot be ignited.
       3. stop the furnace
       When the pressureless boiler is shut down, the operation of the combustion equipment is the same as that of the pressure-bearing boiler, but it is not limited by the requirement that the boiler water temperature is below 50 °C. If a serious water hammer is caused by vaporization during the shutdown, the boiler water supply can be used to replenish water, and the overflow pipe can be used to reduce the furnace temperature and weaken the vaporization phenomenon.

The thermal efficiency is directly linked to the operating cost of the gas steam boiler. It is very important to understand the factors affecting the thermal efficiency of the boiler and to master the method of improving the thermal efficiency of the boiler.

Factors affecting boiler thermal efficiency:
       First, the exhaust temperature of the furnace body. The higher the exhaust gas temperature, the lower the thermal efficiency; and vice versa.
       Second, whether the fuel is completely burned. If the fuel cannot be completely burned, the boiler's thermal efficiency is also very low.
       Third, the heat dissipation strength of the furnace wall. The stronger the heat dissipation of the boiler wall, the lower the thermal efficiency; and vice versa.
       Fourth, the amount of scale in the furnace. The more scale, the worse the heat of the furnace and the lower the thermal efficiency.

Measures to improve boiler thermal efficiency:
       First, reduce the heat loss of smoke exhaust
       The temperature of the smoke is a comprehensive parameter for the design, operation and health of the boiler, and is the main reason affecting the thermal efficiency of the boiler. The exhaust gas temperature of ordinary gas boilers is around 220 °C. After calculation, the thermal efficiency will decrease by 1% for every 10 °C increase in smoke temperature.
       FANGKUAI Boiler invested a lot of energy and money to reduce the heat loss of smoke exhaust. The boiler adopts advanced condensing technology to make full use of the residual heat of flue gas. The exhaust gas temperature can be reduced to about 50 °C, and the thermal efficiency is also increased to more than 107%.
       Second, reduce fuel incomplete combustion heat loss
       Sometimes, due to the poor heat of the furnace or the use of poor quality burners, the fuel cannot be fully burned, which reduces the thermal efficiency and requires a large amount of gas cost.
       In solving this problem, the full premixed combustion technology is used, and the natural gas and air are accurately adjusted before entering the burner to achieve an ideal state, so that the fuel is burned sufficiently and uniformly, and there is no need to worry about heat loss.
       Third, the furnace wall heat dissipation
       The problem of heat loss is unavoidable when the boiler is running. This is the physics conclusion.
       We set up double-layer closed structure in the front and rear smoke boxes, more than 95% of the welding uses intelligent automatic machinery, and each layer is filled with multi-layer centrifugal glass wool for thermal insulation treatment, without ignoring every detail, to a great extent, reducing Loss of heat.
       Fourth, the amount of scale in the furnace
       Boiler feed water contains various impurities and calcium and magnesium ions, which will form scale when operated for a long time. The thermal conductivity of the scale is very low. When the surface is fouled by the heating surface, the thermal resistance increases, the exhaust temperature of the boiler rises, and the heat loss of the exhaust gas increases. In general, 1 mm of scale on the heated surface will increase the heat loss of the exhaust by 2%-4%.
       We use high-quality soft water treatment equipment, operate the boiler feed water softening treatment device in strict accordance with the process, control the boiler feed water quality, and use the patented technology--scale online monitoring, real-time control of scale status, and regularly remind users to the boiler as a whole. Check and clean.

The above is the four methods provided by FANGKUAI Boiler to improve the thermal efficiency of gas-fired boilers. You can check the boilers by referring to the above methods. If you have any problems with your boiler, please contact us immediately and our technical engineers will provide you with a solution for free.