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Management Measures for Water Conservation in Thermal Power Plants

2009-02-20View Original

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Water Conservation Management Measures 1. Management of domestic and industrial water use across the entire company must be strengthened, with strict evaluation. 2. Ensure the recovery of all types of water used in production; for systems such as low-level water tanks, drain tanks, and series expansion vessels, it is necessary to evaluate their efficiency to minimize steam and water losses. Strengthen the turbine spray tanks and the recovery of water in the boiler’s industrial water tank; all low-level water must be recycled to reduce wastewater discharge, and overflow is strictly prohibited. 3. Further strengthen the operation management, inspection, and maintenance of the graywater closed-loop system; under normal circumstances, this system must not be shut down arbitrarily. The water from the boiler industry water sump should be recycled as much as possible into the turbine circulation water; the pumps used for recycling water from the turbine spray tanks and those used for recycling boiler industry water must not be stopped arbitrarily. 4. For the circulating water system, it is necessary to determine economically reasonable quality parameters for the circulating water through chemical analysis; once these parameters are met, the discharge valves should be reduced in size or closed promptly, and discharge should not occur indiscriminately. The water eliminators in the cold water towers must remain in good condition and must not be removed. 5. All sampling at the production site should be adjusted in a timely manner depending on the circumstances; after sampling is completed, the flow rate should be reduced promptly to prevent excessive discharge. 6. The boiler ash removal personnel should arrange the slag removal times for Boilers #1 and #2 in a reasonable manner, striving to carry out slag removal for both boilers at the same time. They should work to improve any defects that arise during the operation of the slag scoopers, in order to reduce the operating time of the slag flushing pumps. After slag removal is completed, the slag flushing pumps should be stopped immediately and their outlet valves closed. The nozzles in the boiler’s slag flushing channels should also be adjusted accordingly to prevent unnecessary spraying that could lead to an increase in the amount of water used for ash removal. If there are other tasks that require the addition of slag flushing pumps, the operation mode of these pumps shall be adjusted with the approval of the on-duty shift supervisor, and records shall be kept. Immediately after returning to normal, resume the normal operation mode of the slag flushing water. 7. The water seals in the boiler’s cold ash hopper, the cooling water for samplers, as well as the water seals used in the flue ducts and preheaters should operate at the lowest possible flow rate while still ensuring an adequate supply of water. It is not allowed to increase the amount of water used for ash cleaning unnecessarily, and excessive overflow must be avoided. The water supply to the electrostatic precipitator’s mixing tank should be turned off promptly when it is not in use. 8. For the cooling water of the generator and the water used for equipment sealing as well as cooling, the volume of these waters should be adjusted in a cost-effective and reasonable manner while ensuring the safe operation of the equipment; such adjustments should not be excessive. The cooling water valve for the drive train should be adjusted according to the temperature of the bearings and the motor; it is strictly prohibited to leave it unadjusted with the cooling water valve fully open. For standby equipment that is out of service for an extended period, its sealing systems and cooling water supplies should be turned off promptly. 9. The steam turbine should strengthen the monitoring and adjustment of the pressure of industrial water and raw water to ensure that these pressures remain within the specified range. 10. Chemical backwashing requires stricter management to prevent water waste from indiscriminate flushing. 11. The Administration Department should strengthen the management of water used for daily purposes. Strict control should be exercised over the water used in bathtubs to prevent water from running continuously. Water used for landscaping and irrigation within the factory area should be used sparingly and in a scientific manner to avoid waste. 12. Strict oversight should be exercised regarding boiler blowdown; flow meters must be properly calibrated, and all types of drainages and wastewater releases throughout the plant should be minimized or eliminated as much as possible. 13. For the heating network, boiler drain tanks, and water supply to start-up boilers, it is necessary to consult the chemistry department; work can proceed only after obtaining approval from the shift supervisor. 14. The ash flushing water and dust removal water generated during combustion operations should be made full use of, while the coal storage area **should be properly controlled to prevent erosion of the coal piles and waste of water. 15. Strengthen the management and allocation of fire-fighting water; it is strictly prohibited for various departments to draw fire-fighting water without authorization. Departments where there are frequent leaks of fire-fighting water should conduct more inspections and address the issues as soon as possible. 16. Water and steam usage for non-core operations should be adjusted reasonably; water and steam supply should be turned off promptly when swimming pools and canteens are closed to prevent waste of steam and water. 17. In winter, it is necessary to strengthen the recovery of water used for heating steam. Recovery should be carried out promptly depending on the water quality. The steam turbine operator must keep the low drain level under control; when the level in the boiler drain tank approaches 2 meters, action should be taken to facilitate recovery in order to prevent overflow or discharge. 18. All employees of the company should embrace the concept that saving water is an honor; they should carry out regular inspections of equipment, promptly address any defects through maintenance, and prevent leaks and other forms of water waste. 19. Department heads and maintenance personnel shall promptly eliminate and improve equipment defects, as well as any equipment, systems, valves, etc. at the production site that make it difficult for operators to work efficiently or that are poorly designed. 20. In winter, heating and drainage systems should be adjusted promptly according to temperature conditions in order to reduce heat and fluid losses. 21. Department heads are responsible for water usage within their respective departments; they must conduct regular inspections to eliminate any unnecessary water flow in those areas.

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