E-mail: [email protected]. Atmospheric pressure boiler products are most popular.. Food plant CHP. Paper mill Power plant. Textile industry. Waste heat recovery. Quick inquiry: I need the quotation of -Please select product- Steam Boiler Hot Water Boiler Industrial Autoclave , the fuel is not for autoclave , the pressure is , this capacity is , use for. Food plant CHP.
Paper mill Power plant. Textile industry. Waste heat recovery. Quick inquiry: I need the quotation of -Please select product- Steam Boiler Hot Water Boiler Industrial Autoclave , the fuel is not for autoclave , the pressure is , this capacity is , use for.
My Name is , my Email is , my phone number is , Please Send the detail information for me! A steam boiler In order to describe the principles of a steam boiler, Principle of boiler operation Coal-fired Power plant. Contact info Company: Zhengzhou Boiler Co. Related product Biomass boiler Coal fired boiler Oil fired gas fired boiler.
If the DP is more than the acceptable limit, reasons to be identified and rectified. Repeat the above procedures at least two times to ensure the correctness of reading. If the result is within limit, then the system is ready for bed material filing.
Bed material size and chemical property must be maintained strictly as per the specification for smooth start up and efficient operation. Switch ON the rotary feeders at bed material bunker outlet and operate it at minimum speed and start filling the bed material to the furnace. Bed material shall be filled up to mm heights above the bubble cap, which is to be verified physically.
Record the minimum fluidization wind box pressure and PA air flow as these are the guiding parameter during Cold startup. All instruments for measurement of NG pressure, flow and temperature are in service. Whenever the Pre interlocks are satisfied, the system is Ready for purging and is indicated by the glow of lamp Purge ready to start.
Initiate the Purge start from DCS. At this stage Purge in progress indication will appear. After the pre set time i. After completion of purging wind box burner combustion air damper moves to start up position. Burner ready to start indication will appear. Initiate burner start command to the selected burner. Whenever the burner start command is initiated the Following actions takes place. Start up burner and Igniter gun assembly is inserted.
Ignition transformer will get de-energised after 5 seconds, after issuing the start command. Pilot flame is sensed by the flame scanner and the individual NG Shut off valves will open and corresponding vent valve will get close. If the burner is stopped manually by STOP push button or tripped for quenching of fire. Purge required signal will energised automatically. Repeated failures in lighting off the burner may cause accumulation of un-burnt fuel and make a threat of explosion.
Maintain the furnace pressure around -3 to 5 mmH2O. Maintain normal water level in Drum. Intermittently fluidize the bed at regular intervals, so as to avoid over heating of bed material. Monitor and maintain the steam drum metal differential temperature at 25C by modulating the firing rate. When Bed temperature will start increasing steadily after coal firing and O2 level in Flue gas start reducing then continue the coal feeding.
After reaching the bed temperature around Deg C, Switch off the over bed burners one by one gradually. Raise the Boiler pressure up to rated pressure in accordance with the enclosed Boiler Cold start up pressure raising curve.
Whenever the drum pressure reaches near the operating pressure make preparation for charging the main steam piping and other distribution lines. While increasing the firing rate always increase the air flow first and then increase the fuel. While loading the boiler, following conditions are to be ensured to achieve the desired output. During low load operation i. Along with the increase in load i. During load ramp up sufficient quantity of inventory is made available to control the bed temperature fluctuations beyond safe limit.
Boiler Air Flow Curves 80 60 40 20 0. Solids Mass Control Total inventory Control The solids mass control is accomplished on-line using sorbent or inert material feed rate, bed drain purge, multi clone purge and MDC recycle rate.
Bed particle size distribution can also be changed by rate of MDC ash recycle and bed drain. Note: Wind box needs to be purged with steam as per the Wind box steam purging procedure. Whenever the boiler rated pressure is attained, connect the boiler to CSDH as per procedure describe in Manual.
Hot Start Up Curve Note: Wind box needs to be purged with steam as per the Win box steam purging procedure. Apart from steam purging, Furnace purging also need to be carried out as per Furnace Purging Procedure. Once the required bed temperature is attained, initiate the solid fuel firing as per the procedure. Whenever the boiler rated pressure is attained, connect the boiler to CSDH as per procedure describe in manual. Switch off the ESP transformer whenever the backend temperature drops below C but keep the heaters and the rapping system in service.
Using high temp FW, increase water level to 6" below top of drum and hold between 6" and 12" until zero pressure. Stay on this side of curv Open Su r drains to equalize temp of the dru shell 3 rounds. If personnel need to enter the unit, all solids must be removed completely from the boiler including the furnace, U-Beam zone, super heater pass floor, MDC hoppers, and ESP and wind box.
Solid fuel feeders. Limestone feed system. Makeup bed material silo. If the unit is shut down for a short period of time, store the solid inventory in the MDC ash hopper and furnace. Loss of both water supply and draft - Black plant with the boiler trip and isolated from the power grid, with only emergency power available.
This is the most important emergency situation.
0コメント