- MULTI SOLID FUEL FIRED BOILER: A multi solid fuel fired boiler is a type of boiler that can burn a variety of solid fuels, such as coal, wood, biomass, and agricultural waste. This makes them a versatile and cost-effective option for many applications, such as industrial process heating, district heating, and power generation.
- PROCEDURE:
- Checks to be carried out before starting the plate heat exchanger:
- Check and ensure soft water level in the day storage tank and open the valve the tank outlet valve.
- Select the feed water pumps 1 or 2 by using the selector switch.
- Close the boiler main steam stop valve and open the air vent valve (It is important to keep the air vent open to prevent vacuum in boiler).
- Check the soft water hardness maintain <5 ppm.
- Bag filter running time don’t open the top doors & side doors, Maintain the bag filter in let temperature should be 130°C to 200°C. Maintain the air pressure for bag filter 6kg/cm².
- Prestart up:
- Switch ON the main switch and individual switches for all equipment and control supplies to the boiler control panel.
- Put the boiler vent valve open and main steam valve closed.
- Switch ON the feed water pump fills up water up to the required level.
- Close the ID and FD fan dampers to minimum position.
- Open the flue gas dampers, required for fuel firing.
- Open the air valve for the bag filter, Check the (ICBD) Inlet com bypass damper valve open or close.
- Check and ensure that all safeties are within set limits.
- Startup procedure:
- Check the optimum water level in the gauge glass.
- Check the water level is controlled by mobrey level controller depending upon water level.
- To prepare the fuel bed, spread briquettes waste cotton socked in kerosene over bed and set it on fire.
- After the prepared bed catches full fire.
- Put the FILL AND FIRE selector switch in fire position ID fan starts operating.
- After put ON the FD fan. Feeding will start and the fuel will catch the fire suspension.
- Operate the secondary FD fan air damper to adjust the fuel feeding rate.
- Switch on the rotary switch of Bag filter rotary air lock valve.
- Switch on the rotary switch of dust collector rotary air lock valve. (Whenever applicable)During this process, continually monitor carefully as the fuel is loaded and ensure that you use the manual section of the visualization where necessary to maintain a uniform layer.
- The initial fuel bed should be maintained around 100 – 200 mm thickness.
- Steam pressure will start increasing. When reach the above 7 kg/cm² open the main steam valve.
- Stopping Procedure:
- Switch OFF the secondary FD fan.
- Switch OFF the primary FD fan.
- Keep the ash doors and ID fan damper full open to cooling by atmosphere air.
- Wait until the furnace temperature come down.
- Turn the FILL &FIRE Switch OFF position ID fan automatically OFF.
- Close the boiler main steam stop valve and keep the air vent valve open.
- Blow down the boiler, membrane panel header, Mobrey level switch and gauge glasses under pressure. The boiler blow down should be such as to maintain a TDS in the boiler to less than 3500 PPM and then close the blow down valve.
- Bag filter & MDC rotary air lock valve should be off, after stopping boiler clean the combustion bed.
- Ensure that water tank is full for subsequent operation.
- Isolate boiler control panel by putting OFF all electrical supply.
- Clean the boiler and bag filter its surrounding areas.
- Drain the water tank by opening the drain valve to bring down the water level by 1”. In case of boilers working continuously, drain the tank about one minute after 8 hours and close the drain valve.
- When boiler is shut off a short period, keep the vent valve slightly opened.
- REFERENCES:
- Not Applicable
- ANNEXURES:
- Not Applicable
- ENCLOSURES:
- SOP Training Record
- DISTRIBUTION:
- Controlled Copy No. 01 : Head Quality Assurance
- Controlled Copy No. 02 : Head Engineering
- Master Copy : Quality Assurance Department
- ABBREVIATIONS:
| No. | : | Number |
| SOP | : | Standard Operating Procedure |
- REVISION HISTORY:
- CHANGE HISTORY LOG
| Revision No. | Details of Changes | Reason for Change | Effective Date |
| 00 | New SOP | Not Applicable | To be written manual |