The steam boiler has a certain pressure, which belongs to the category of special equipment. After running for a period of time (3 months, half a year, one year, etc.), it is necessary to carry out maintenance and maintenance work. What should be paid attention to during maintenance and safety inspection? Let's share it with everyone.

1. Before the maintenance work, it should be observed whether the environment has working conditions. If the conditions are not met, the value should be notified and reported to the superior leader.

2. Before the maintenance work, notify the operator to cut off the water, electricity, steam source and be listed by a special person.

3. Tools, various materials and accessories should be placed in the inspection to prevent falling into equipment, pipes or furnaces.

4. When entering the furnace, smoke ducts and other space operations, the ventilation conditions should be good, and the temperature can be reduced to the working temperature before entering the work.

5. After the work is finished, check whether the tools, materials and accessories are complete and prevent them from remaining in the space such as the furnace.

6. After the work is completed, the special person will be delisted and the inspection will be completed before leaving the work site.

7. Report the inspection results to a long value and make a maintenance record.

The maintenance and maintenance of steam boilers will directly affect the service life and stability of the equipment. It is a matter of concern for the enterprise units that need a large amount of steam for production operations. Maintenance and maintenance are required to ensure that the steam boilers maintain normal operation.

In order to maintain a stable, long-lasting, and efficient operation of the gas boiler, routine maintenance and maintenance work is essential. What are the daily maintenance work of gas boilers? Listen to the fast boiler for you to come together.

First, routine maintenance
       1, daily work
       (1) Checking the function of the water level regulator: Whether it can automatically water up and stop the pump.
       (2) Inspection of flame monitoring.
       (3) Rotate, slide, and lubricate the cam parts and wipe them.
       (4) Flush the water level gauge 1-2 times (per shift), and operate in the correct way until the water level gauge is cleaned.
       (5) Sewage 1-2 times (per shift).
       2, regular work
       (1) Items to be inspected each week
       1) When the ultra-low water level is shut down, it is necessary to carry out the furnace test (press the button on the B3 board, it should be able to simulate the water shortage), or discharge the sewage to check the function of the ultra-low water level shutdown.
       2) The safety valve is manually opened once and the reset is quick.
       3) The burner control system and the electric eye should be inspected, and the photocell of the electric eye should be extracted by hand. The furnace should be stopped within 1 s; and the electric eye should be wiped.
       4) Fill or replace the valve packing; eliminate running leaks.
       5) Fix the bolts everywhere, especially the gas pipeline system, and check for leaks if necessary.
       (2) Clean the filter on the gas line once a month.
       (3) Maintain the following parts every six months
       1) Check the pressure gauge and clean the watch tube, add distilled water when resetting.
       2) Maintain the water level electrode, and then use a fine sandpaper to polish it.
       3) Clean the flue, generally based on the exhaust gas temperature to determine whether it needs to be cleaned. Under normal circumstances, the exhaust gas temperature does not exceed 350 ° C (measured at the boiler exit, measured at the flue inlet), too high means increased fouling, boiler efficiency is reduced, must be cleaned. The purpose of cleaning the flue is on the one hand for economic considerations and on the other hand for safety reasons (smoke is poorly thermally conductive and prone to local burnout). When cleaning and replacing asbestos liners, it is necessary to use the method of erroneous joints (proofing smoke), graphite coating, and no lubrication.
       4) After the boiler repair or annual inspection, check that the manhole, head hole and hand hole nut cannot be loosened. Check the motor steering (from the fan end, turn counterclockwise).
       (4) Check the safety valve once a year, and conduct a comprehensive inspection and maintenance of the boiler.

Second, the normal shutdown
       (1) Stop the fire: first turn the size fire knob to the small fire position, then turn off the burner;
       (2) depressurizing the steam;
       (3) Sheung Shui to high water level;
       (4) closing the main steam valve;
       (5) Close the upper water gate;
       (6) Close the gas gate;
       (7) Check if the drain valve is closed and tight;
       (8) Turn off the main power switch;
       Note: When the hot water boiler is shut down, the circulation pump cannot stop the pump immediately after the burner is turned off.

Corrosion is an important factor affecting the service life of gas boilers. If the operator fails or does not perform maintenance work on time, the boiler will be corroded, which will make the thickness of the boiler body thinner, reduce thermal efficiency and shorten the service life.

There are two main reasons for the corrosion of gas boilers, namely smoke corrosion and scale corrosion. These two kinds of corrosion are formed over time, and if they are not taken seriously, they will cause damage to the equipment, and in severe cases, serious accidents will occur.

The primary cause of boiler corrosion is flue gas. The boiler needs fuel to burn, and the combustion process is bound to generate smoke. When the high-temperature flue gas passes through the boiler wall, condensation will form, and the formed condensate will seriously corrode the metal surface.

Another major cause of boiler corrosion is scale corrosion. For example, the kettle for daily water burning, if used for a long time, there will be scale inside the kettle, first of all, it will affect the quality of drinking water, and then it will take longer to boil a pot of water. The boiler is a "big behemoth" that is hundreds of times larger than a kettle. If corrosion occurs, the hazard is very large.

Therefore, it is recommended that you use the gas boiler enterprise unit. When purchasing a gas boiler, you must choose a manufacturer with reasonable specifications. The water used by the boiler must also be softened to ensure safe production of the boiler and make it more durable.

The burner is a combustion device of a gas boiler. A good burner can realize automatic ignition, monitoring of combustion status, protection against ignition, flameout protection, high and low pressure protection of gas pressure, protection against insufficient air pressure, and power failure protection. What role can these functions play? Listen to FANGKUAI Boiler to introduce you one by one.

1. Automatic ignition function
       The gas burner should be equipped with electric spark ignition, which is convenient for automatic control. The ignition time is generally between 2 and 5 seconds.

2. Combustion status monitoring function
       Mainly monitor the flameout state of the gas boiler burner, and the monitoring object is the flameout signal. Once the flame detector detects this signal, the burner will automatically cut off the air supply and the burner will stop running.

3. The burner does not catch fire, automatic protection function
       When the gas boiler burner is ignited. The ignition action occurs before the ventilation. After the ignition action occurs, if the human flame detector does not detect the flame signal, the burner automatically enters the protection state.

4. Burner flameout protection
       After the burner is turned off, the temperature in the furnace of the gas boiler is still relatively high, the burner will stop running in a short time, and the supply of the gas source is automatically cut off to prevent excessive gas from entering the furnace and causing an explosion.

5. Gas pressure high and low protection
       The gas boiler burner will operate within a certain range of gas pressure, above or below this range, the burner will enter the protection state.

6. Air pressure protection function
       When the gas boiler burner is running, if the amount of air in the furnace is insufficient, it will always be inhaled, which will cause the furnace to deflagrate, which is very dangerous. Therefore, once the air in the furnace is insufficient, the burner will automatically enter the protection state.

7. Burner power failure protection function
       When the gas boiler burner is in operation, if it is suddenly powered off, it will be very dangerous. Therefore, the burner is provided with power failure protection.

Strictly speaking, the gas boiler needs to do an overall inspection and related repair and maintenance work within three months of operation to ensure the safe operation of the boiler to the maximum extent and avoid safety accidents. The content of maintenance mainly refers to the local and preventive maintenance of the boiler without stopping the furnace during operation. The boiler operation personnel are the main ones, and the maintenance personnel are supplemented. The specific maintenance parts are as follows.

1. Pressure gauge: Check and eliminate the leakage of the cock and the condensate pipe joint; turn the three-way cock to check whether the pressure gauge pointer returns to zero; check whether the condensate pipe is unblocked.

2. Water level gauge: Check the water level gauge cock; eliminate leakage and air leakage; repair and replace damaged parts.

3. Safety valve: Check the safety valve for leaks; check whether the seal is damaged or not, and whether the exhaust pipe is unblocked.

4. Pipelines and valve parts: cleaning and touch up the exterior part of the paint; maintenance of pipelines and valve parts leaking and leaking phenomenon.

5. Auxiliary equipment: Check water supply, circulating water pump and water treatment equipment. Clean the pump inlet filter and oil and gas filter.

6. Thermometer: check the thermometer, to be clearly visible.

7. Automatic control device: check the circuit, controller, regulating valve, operating system and electrical instrumentation, whether the line is loose; check the ignition program and the reliability of the interlocking alarm protection device.

The above is the FANGKUAI Boiler for you to organize, the gas boiler must be regularly maintained during the operation of the gas boiler, hope to help your boiler equipment, away from dangerous accidents.

Gas boilers provide high quality steam and hot water for many industrial enterprises and production and life, and are important thermal energy output devices. What do the newly installed gas boilers need to do before starting? FANGKUAI Boiler has compiled the following seven precautions for your reference.

1. Hydraulic test (overpressure test)
       The purpose of the hydraulic test is to verify the strength and tightness of the pressure-bearing components inside the boiler. The newly installed gas boiler shall be subjected to an overpressure test with a working pressure of 1.25 times. Generally, after the pressure parts are inspected, such as replacing or repairing some valves, boiler tubes, headers, etc., and the medium and small repairs of the boiler shall also be subjected to working pressure.

2. Auxiliary machine test and calibration of various electric doors and dampers
       In many cases, gas boilers cannot be stopped, so many companies will provide auxiliary equipment to the boilers, auxiliary machines and the electric boilers and dampers to provide better emergency services.

3. Oven
       The main purpose of the oven is to remove the moisture from the furnace wall and the water in the boiler tube. The boiler is brought to a certain degree of dryness to prevent the furnace wall from being wet when the boiler is running, and the furnace wall is cracked after the sudden heating is unevenly heated. At the same time, the oven has a relatively good strength in the furnace wall to improve the high temperature resistance of the furnace wall.

4. Cooking stove and pickling
       Use lye and acid to remove deposits such as grease, rust, scale and other corrosion products and scales in the heating surface of the evaporation system.

5. Furnace aerodynamic field test
       The furnace aerodynamic field test is to measure the wind speed of each tuyere of the boiler, and then calculate the air volume. Only when the wind speed and air volume meet the requirements of the boiler working conditions will the boiler be deprived of oxygen.

6. Flushing
       The purpose of flushing the gas boiler is to use the boiler's own steam to flush out the rust, welding slag, iron filings, ash and grease in the superheater, the heating surface tube and the steam pipe, otherwise it will supply steam to the steam turbine. There will be a hazard, and the boiler should be officially activated before flushing. Therefore, the boiler flushing tube is also the first complete starting process of the boiler itself. It plays the role of testing equipment, inspecting equipment, and initially grasping the operating characteristics of the equipment, laying a foundation for the smooth trial operation of the equipment.

7. Verify the security door
       The safety door is set to prevent overpressure of the soda system and is a safety guarantee for the normal operation of the boiler. Therefore, before starting the gas boiler, be sure to check the safety door to avoid leakage.

I believe that many users have heard of the boiler business personnel of major manufacturers when buying gas boilers. They should configure the boiler with softened water treatment facilities. So what exactly does this softened water treatment facility do? Must the gas boiler be equipped with a softened water device? Today, FANGKUAI Boiler will tell you what is the softening water treatment.

1. What is softened water?
       Soft water refers to water that has been softened and deoxygenated by equipment. Soft water treatment can reduce the content of calcium and magnesium salts in hard water such as tap water and mineral water, so that the water quality meets the water quality standards stipulated by boiler equipment.

2. Why should soft water be used in gas boilers?
       Scale is known as the “source of all kinds of harm” for all types of boilers. The use of soft water prevents the boiler from producing scale and reduces corrosion on the heated surface metal. Reduce boiler failure rate and extend service life.

3. How is scale generated?
       The impurities in the water in the boiler are concentrated and concentrated during the boiling boiling evaporation process. When these impurities reach saturation in the pot water, solid matter is precipitated. The precipitated solid object, if suspended in the pot water, is called water slag; if it is firmly attached to the inner wall of the furnace, it is called scale.

4. What are the hazards of scale to the boiler?
       a. The heating tube is burned due to overheating. The scale is poor in thermal conductivity. Too much scale in the heating tube is too thick, which may cause the internal temperature of the heating tube to not spread, resulting in cracking of the outer tube of the heating tube.
       b. A large amount of energy waste When the boiler is fouled, the thermal conductivity of the heating tube is lowered, thereby prolonging the heating time, resulting in an increase in the amount of electricity used by the equipment. The higher the working pressure of the boiler, the lower the thermal conductivity of the scale, the higher the scale thickness, and the greater the amount of electricity wasted.
       c. Reduce steam pressure When there is scale on the inner wall of the boiler or the heating pipe, the heat will not be transferred to the boiler water very quickly, which will reduce the steam pressure of the boiler, so that the output pressure of the equipment can not meet the requirements of use.
       d. Increasing the maintenance cost After the inner wall of the boiler or the heating pipe is covered with scale, it is very difficult to remove, especially the damage of the heating pipe or the furnace body caused by scale, corrosion, etc., which not only damages the equipment, but also requires a lot of manpower and material resources to repair. , resulting in an increase in maintenance costs.
       e. Reduce the service life of the boiler After the boiler is seriously fouled, it needs to be cleaned with chemical agents. If the cleaning times are too many, it will cause damage to the boiler, reduce the service life of the boiler and increase the safety hazard.

According to the equipment requirements of gas boilers, the use of softened water is a profitable thing in the long run, and it is also one of the necessary conditions to ensure the stable operation of the boiler. Therefore, professional boiler business personnel will emphasize to the user that the boiler softened water treatment should be arranged.

1. The most common problem is that boiler water treatment is not implemented. At present, some boilers are often not taken seriously because they are relatively small in capacity, or are used only in winter, and those who manage small boilers often have insufficient experience in boiler water treatment, and no boilers are implemented in the boiler management process. Effective boiler water treatment causes scaling or corrosion of the boiler, which has a serious impact on boiler management over time.

2. The boiler water treatment method is improper. At present, many enterprises have often adopted unscientific methods for the treatment of boiler water in order to save more expenses, and the tools and instruments used in the process of boiler water treatment do not comply with the relevant regulations. This kind of practice can not fundamentally solve the problem of boiler scaling and corrosion, and at the same time not only causes waste of energy but also reduces the service life of the boiler. Moreover, if the anti-scaling agent is used improperly, it will have the opposite effect on the protection of the boiler, accelerate the scaling and corrosion of the boiler, and bring serious threat to the normal operation of the boiler.

3. At the same time, there are still problems with boiler water treatment equipment. If the water quality of the water treatment equipment used in the boiler water treatment is not good, and the water discharge efficiency is not high, the boiler scale and corrosion are often accelerated. The main reason is that the resin is damaged and eventually oxidized; or the inner wall of the iron boiler is not treated promptly and properly, resulting in iron poisoning of the resin.

4. In addition, many companies do not pay attention to the pH of boiler water. For steam-type boilers, the water hardness index is very important. The hardness of the boiler water often affects the later scaling and corrosion problems. If the hardness of the boiler water is high, the boiler water will be fouled by evaporation, and the hot water boiler is relatively more susceptible to corrosion.

All of the above are some problems in water treatment at this stage. You can check your own gas boiler first to see if there are any problems. Early detection and early settlement will enable the boiler to create more benefits for you.

First, the igniter problem
       If the pulse igniter and controller fail, one of the gas boilers will not start.

Second, the battery problem
       If there is a problem with the battery, the first thing to look at is whether the battery is too old, because the voltage is not enough to make the gas boiler not catch fire.

Third, the water pressure problem
       The water in the inflow of the filter in the water inlet of the gas boiler cannot flow normally, and it can be used normally after being cleaned and cleaned.

Fourth, the solenoid valve problem
       If the gas boiler is ignited, only the ignition sound can be heard, and there is no magnetic sound of the solenoid valve "嗒", which may be damage or aging of the solenoid valve. When the solenoid valve is aging, it will be uncontrolled. When the fire is started, it can be sucked and hit, and it will catch fire, but then it will close and turn off. Before confirming that the solenoid valve is good or bad, make sure that the ignition control circuit is normal. Can not control the solenoid valve to pull in.

Five, ignition needle or induction needle problem
       The ignition coil offset of the gas boiler can be changed or the ignition needle can be correctly placed; if the induction aging problem is solved, it is only necessary to place the induction polishing.

Sixth, the pipe can not be exhausted normally
       The gas boiler pipe has an infarction, and the pipe for inflating the pipe intrusion is too long and is not properly installed. Refer to the instructions for a balanced water heater double-layer pipe installation.

Seven, water and gas linkage installation problems
       In the gas boiler water-gas linkage valve, the tympanic membrane is aged or damaged, and the micro-switch cannot be pushed; the micro-switch is broken.

Every winter, there will be a lot of users asking about the "method of using natural gas hot water boilers". According to this question, Xiaobian asked our professional boiler technicians and summarized them below. You can refer to them.

Let us take the example of one of the FANGKUAI Boiler star products, the condensing gas hot water boiler.

1. Firstly, it is necessary to carry out safety inspections on the boiler, whether the valves of the valves are loose, whether the drain port of the drain is open or not, and so on, to ensure that the safety indexes of the boilers are at normal levels.

2. After connecting the waterway system, fill the system with water, and observe the water pressure change of the internal pressure gauge of the boiler. When the limit value is reached, stop the water injection and check whether there is loose leakage at the connection of each waterway.

3. Turn on the power, press the power button, let the water pump rotate, discharge the air in each heat exchanger coil or unscrew the manual exhaust valve at the front end of the heat exchanger to exhaust. After the exhaust water pressure drops, the water is replenished. Until the water pressure reaches the working range.

4. After filling the water, the pipe is connected well, the gas source is turned on, the ignition operation is performed, and the red signal light on the sub-control board is observed. After the power is turned on, the backlight is slowly flashed, and the ignition flashes rapidly after successful ignition.

5. The boiler has adjusted various parameters before leaving the factory, and the user does not need to adjust it at the site. However, if the local natural gas calorific value, air pressure or altitude is changed (compared with the plain area), it must be burned. System analysis and adjustment, the specific operation method needs to be analyzed and adjusted by the professional technicians according to the combustion system.

If you want to know more about gas hot water boilers, please continue to pay attention to FANGKUAI Boiler Co., Ltd., we will continue to provide you with troubleshooting.

First, the safety distance of the boiler in the boiler room
       The net distance between the boiler and the internal walls of the boiler house building shall be left to the furnace operator to operate, overhaul and arrange the auxiliary machine space.
       1. The front distance of the furnace
       Steam boiler 1 ~ 4t / h, hot water boiler 0.7 ~ 2.8MW, not less than 3.0m;
       Steam boiler 6 ~ 20t / h, hot water boiler 4.2 ~ 14MW, not less than 4.0m;
       Steam boiler 35 ~ 65t / h, hot water boiler 29 ~ 58MW, should not be less than 5.0m.
       Note: When it is necessary to replace the boiler tube in front of the furnace, the clearance before the furnace should meet the operational requirements. For steam boilers of 6 to 65 t/h and hot water boilers of 4.2 to 58 MW, when the furnace control room is equipped with the instrument control room, the clearance from the front end of the boiler to the instrument control room can be set to 3 m.
       2. The clearance of the channel on the side and back of the boiler
       Steam boiler 1 ~ 4t / h, hot water boiler 0.7 ~ 2.8MW, should not be less than 0.8m;
       Steam boiler 6 ~ 20t / h, hot water boiler 4.2 ~ 14MW, should not be less than 1.5m;
       Steam boiler 35 ~ 65t / h, hot water boiler 29 ~ 58MW, should not be less than 1.8m.
       In addition, when it is necessary to blow ash, set fire, remove slag, install or repair the spiral slag remover, the clear distance of the passage should meet the requirements of operation. It should be added that the distance between the highest operating point of the boiler and the lowest structure at the top of the boiler room should not be less than 2 m.

Second, the safety distance between boiler and production workshop
       The boiler room and the production workshop are connected at different speeds. The two must be independent, generally more than 5 meters.

Third, the safety distance between the boiler room and the building
       1. The safety distance between the boiler room and a type of high-rise building is 15 meters: one type of high-rise refers to 9-16 floors (the height is up to 50 meters);
       2. The safety distance between the boiler house and the multi-storey residential building is 13 meters: multi-storey buildings refer to houses of 2-9 floors and other civil buildings with a height of not more than 24m;
       3. The safety distance before the boiler room and the podium is 10 meters: the height of the podium connected to the high-rise is generally not more than 24m.

Note: The podium refers to an outbuilding that is connected to a high-rise building and has a height of no more than 24 meters outside the projection of the main building of the high-rise building.

Different types of boiler pressures are also different. According to the pressure, there are mainly low-pressure boilers, medium-pressure boilers, high-pressure boilers, ultra-high pressure boilers, subcritical boilers, critical boilers, supercritical boilers and ultra-supercritical boilers. The following are specific The pressure divides.

1. Low pressure boiler
       The outlet steam pressure is ≤2.45MPa, and the steam temperature is mostly saturated temperature or ≤400°C.

2. Medium pressure boiler
       The outlet steam pressure is in the range of 2.94-4.90 MPa. According to the current series of power plant boilers, the steam pressure at the outlet of the medium pressure boiler is 3.83 MPa and the steam temperature is 450 °C.

3. High pressure boiler
       The outlet steam pressure is 7.84-10.8 MPa. According to the current series of power plant boilers in China, the outlet steam pressure of the high-pressure boiler is 9.81 MPa, and the outlet steam temperature is 540 °C.

4. Ultra high pressure boiler
       The outlet steam pressure is 11.8-14.7 MPa. According to the current series of power plant boilers in China, the steam pressure at the outlet of the ultra-high pressure boiler is specified as 13.7 MPa, the steam outlet temperature is 540 ° C, and the minority is at 555 ° C.

5. Subcritical pressure boiler
       The boiler with an outlet steam pressure of 15.7-19.6 MPa. According to the current series of power plant boilers in China, the subcritical pressure boiler outlet steam pressure is specified as 16.7 MPa, the outlet steam temperature is 540 ° C or 555 ° C, and a few are 570 ° C.

6. Supercritical pressure boiler
       For boilers whose outlet steam pressure exceeds the critical pressure, the critical pressure of water vapor is 22.1 MPa. At present, the supercritical pressure of power station boilers is mostly between 25-27 MPa.