18 ton high pressure steam boiler

After the system control principle of vertical gas-fired 18 ton high pressure steam boiler is turned on the power switch, click the pump control switch to turn on the position, carry on the boiler feed water to rise to the normal position, click the burner power switch, click the start button. The power supply of the control system is turned on and the burner enters the working state. According to the operation procedure of the program controller, the low-fire combustion is carried out first and then into the fire-burning state, and the boiler enters the normal operation stage. When the water level rises to the high water level, the output high water level alarm signal light is lit, accompanied by the sound of the electric bell, and the protection shutdown is realized to cut off the power supply of the controller. When the water level rises to + 30mm, the pump stops running, and when the water level drops to-30mmm, the pump automatically restarts, When the water level drops to ±50mm, the output is extremely high, the warning signal light is lit at the very low water level, accompanied by the sound of the electric bell, and the power supply of the controller is cut off by protecting the shutdown of the furnace. When the pressure rises to 0.72MPa, the overpressure signal, the sound of the electric bell, alarm and cut off the power supply of the control system to realize the emergency shutdown of the furnace. When the pressure exceeds the upper limit of the regulating pressure, the controller outputs a small fire signal to close the fire valve and open the small fire valve to burn in a small fire. When the pressure falls below the lower limit of the regulating pressure, the controller outputs a fire signal to open the fire valve to burn the fire. When the burner failure occurs, the combustion controller automatically closes the valve to stop combustion. When the exhaust temperature is higher than 250 ℃, there is a blue light, accompanied by the sound of the electric bell, and the protection shut down the power supply of the controller.

To stop running after the boiler flameout, why fans need to continue ventilation 5min? Since the flame shutdown process, since the furnace temperature is lowered, the combustion unstable, so that incomplete combustion of fuel increases, the fuel remaining in the furnace and the flue waste heat of the furnace under heating, then combustion will produce a direct threat to the safety of boiler equipment. So turn off the boiler, ventilation fans continue for some time to take away the fuel in the furnace, but ventilation time not too long, otherwise due to the large amount of cold air directly into the furnace, make the furnace, flues and various heating surface is rapidly cooled contraction, resulting in damage. Therefore, the boiler flame, the ventilation fans continue 5min stopped, and then close the shutter smoke duct, so that the furnace and the flue is in the closed state, and also continues to monitor the flue gas temperature to prevent the pump do not re-combustibles combustion.

Second Session of the CPPCC National Committee Session of March 5 press conference held in the afternoon, the CPPCC National Committee of Population, Resources and Environment Committee, Democratic National Construction Association Central Committee, Environmental Management Division of the Ministry of Ecology Environment Atmospheric Liu Bingjiang said: Last year, resolve more than 30 million tons of steel production capacity, 810 million kilowatts of coal-fired units basically reached the national emission levels of natural gas, built the world's largest clean coal power base, out of 1.3 million units in industrial furnaces, coal accounts for the country's primary energy consumption the proportion of first time below the 60% to 59%, and turned off the small coal-fired boilers 23000 units.

At present the country has completed a preliminary air pollution control goals, the future will continue to promote coal-fired boilers governance, and the introduction of more stringent emission performance standards of air pollution.

In the specific implementation process should pay attention to a few points:

1, according to the strict rules of water treatment, to ensure acceptable addition salt supply, to reduce the impurities in the water, to reduce the water vapor thus reducing the salt content of the salt furnace, to ensure good quality feed water.

2, reasonably boiler blowdown. Boiler blowdown discharge points periodically and continuous blowdown, periodic blowdown of boiler water can be eliminated and the precipitate slag. Continuous blowdown pot of water can reduce the amount of salt, silicon content. Therefore boiler attendant should be carrying out the work of the technical measures for emission standards for technical and operational breakout strictly enforced.

3, according to the technical standard boiler regulations: strict control of boiler water level normal, caused by high water levels prevent steam with water, resulting in the deterioration of the quality of steam. Also, avoid sudden changes in the load, in order to avoid false water level caused by the sharp increase in water level in a serious deterioration in the quality of steam.

4, water quality requires stringent requirements, real-time adjustment of boiler operating conditions. Because soda boiler monitoring indicators to determine the chemical experiments of each heat boiler, the operation should remain qualified soda quality.

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