How to maintain the boiler shutdown? After boiler shutdown cooling, heating surface must be thoroughly cleaned of fouling and ash grate the upper, the lower portion of the furnace. Then to maintain a certain degree of natural ventilation flue. In general, in order desiccant moisture should be placed in the furnace, flue. The quicklime as a drying agent, within the furnace or flue gas per cubic meter should be placed generally about 3kg. After placing all the ventilation should be tightly closed doors. After the change of lime powder to be replaced. Low-lying position as boiler room, ground during shutdown severe flood tide, often approach should be used and placed a small fire to dry desiccant combination. How to care? If the boiler shutdown a long time, the boiler shutdown after complete removal of soot coated with an anti-corrosion red lead paint in oil or other metal surface furnace. As internal corrosion Maintenance shutdown of the boiler body, under normal circumstances, can be used wet shutdown maintenance is not more than one month, one month electrically operated 1000 kg per hour steam boiler should be taken to dry more maintenance. To note the following problems when a dry maintenance: desiccant boiler not in direct contact with the metal surface, may be mounted in a container such as the iron plate after the desiccant is placed, and a hole for shutting the other hand hole cover.
Check gas boiler before the preparation of cease-fire and that the flue slow cooling drum; open all manholes and hand holes in the header of the boiler body; let go of the gas within the boiler drum and water; the boiler combustion chamber, drum , flue ducts thorough cleaning; steam pipeline cleaning and removing rust and scale water; repair or replace a manhole cover; ready safelight, flashlights, test rods, tools and the like. Burner gas is an important part of the boiler, the main control system and combustion system components, the problem lies in easy control cabinet, 1. However, the normal ignition off this failure phenomenon typical cause of several tens of seconds after the self-ignition of the burner flame sensor dirty parts. The flame sensor is a photoresistor when irradiated with light of its own resistance decreases resistance value increases as a state of high impedance low impedance state when the light irradiation. Burner flame sensor controller in accordance with a resistance value to determine whether the process is continued if the combustion stop combustion flame sensor high impedance supply is immediately stopped to prevent the unburned diesel fuel reservoir. Flame sensor probe positioned within the burner duct, since the black smoke, tempering, blowing dust and other reasons that the surface thus losing readily soiling the photosensitive functionality. Check sensor probe, its surface is cleaned with a detergent or alcohol, if necessary. 2. Ignition normal exhaust smoke color but not normal diesel fuel injected into the burner is burning the mixture under stirring, when the appropriate amount of blowing water vapor and CO2 exhaust gas atomization are colorless. When there is insufficient air supply can cause incomplete combustion of diesel soot to form CO and thus give rise to the phenomenon of black smoke exhaust. However, if a strong wind inlet excessive combustion of oil mist may be blown off too late will form white smoke is discharged. Common causes of black smoke exhaust of combustion into the throttle opening is too small, white smoke into the throttle opening is reason to see through the large, two cases should be re-adjusted into the throttle. Exhaust smoke color can be observed while the side damper opening degree until near colorless in exhaust smoke color adjustment. Another reason is that black smoke exhaust poor atomization of diesel, oil mist contained in the larger droplets, can not be sufficiently mixed with the air due to a local incomplete combustion produce soot.
WNS type gas 1000 kg per hour steam boiler system control principle: ①, after WNS type gas steam boiler on the power switch, click on the pump control switch open position, after boiler feed water rises to the normal position, click-burner power switch, clicking the start button, the control system power is on, the burner into the working state, according to the operation program for the controller, to be re-ignition burner fires into the combustion state, the boiler enters normal operation this stage. ②, high output level when the water level rose to a high level alarm signal indicator light, when the water level rises to the pump stops running + 25mm, the water pump when the water level falls -25mmm automatic restart, when the water level falls -50mm, outputs a low level alarm indicator light, with bell sound, and cut off the power to the controller to achieve protection shutdown, -75 mm when the water level falls, the output signal of low water level indicator light. ③, when the pressure is raised 0.73MPa, the output signal of the first indicator light overpressure, combustion conditions and off the controller circuit, the controller stops the shutdown. Output when the pressure rises above a second overpressure 0.75MPa signal issued bell sound, alarm and cut off the power supply control system implemented emergency stop. Regulating the pressure when the pressure exceeds the upper limit, the controller output signal of a small fire fire closed valve, a valve to open the small kerosene ignition burner. When the lower limit pressure drops below the regulated pressure, the controller outputs the fire signal to open fuel valve fire, the fire to burn. ④, after the failure of the burner failure occurs, the burner control valve is automatically shut down to stop the oil combustion. Vertical coal-fired steam boiler structural features
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