The 300MW unit water balance test calculates the water consumption, water tower drift and leakage loss of the 300MW unit by measuring the water consumption of the 300MW unit's supplementary water and industrial water users. By measuring the total water consumption of the boiler ash system and the water consumption of each user, Calculate the ratio of ash to water. Water balance test data of 300MW unit.
300MW unit water balance test data table serial number unit value 1300MW unit hour water consumption t/h1392.62 two units total power generation (24 hours) MWh108813 two units hour coal consumption t / h179.684 two units coal ash volume t /h35.4551 unit circulating water volume t/h3850062 unit circulating water volume t/h2600071 machine to furnace ash consumption water consumption t/h270.682 machine to furnace ash consumption water consumption t/h153.791 machine miscellaneous air pressure Machine water consumption t/h62.7
The water consumption index of the 300MW unit is calculated from the water balance test data. The water consumption index of the 300MW unit is calculated as follows: (1) Power consumption of the power generation operation Water consumption operation V transportation = water consumption ÷ power generation = 33, 423.2 × 103 ÷ (10881 × 103 ) = 3.0kg / kWh type: water consumption = urban tap water flow + No. 2 machine water absorption well water + water tower and industrial pool water level change equivalent water volume = 33423.2t (24 hours).
(2) Power generation installed water consumption power generation installed water consumption V installed = whole plant power consumption (m3 / s) ÷ 1000MW capacity meter of the entire plant installed capacity (GW) = 1392.6 ÷ (0.6 × 3600) = 0.65m3 / (s .GW) If 20% margin is considered, the installation water consumption V is installed = 0.65 × 1.2 = 0.78m3 / (s.GW) (3) Water tower drift loss and leakage loss drift, leakage loss = 1, The amount of water drifting on the No. 2 water tower 总 No. 1 and No. 2 total circulation water volume = 1.15% In the formula: the amount of water that drifts and leaks = the water supply of the 300 MW unit - the quantity of the industrial pump water -1, the total amount of the No. 2 machine to the furnace ash -1, No. 2 furnace air compressor cooling water volume - chemical water system treatment raw water volume + No. 2 water absorption well water supply = 743.1t / h1, No. 2 total circulation = 64500t / h (4) No. 1, 2 Water ratio of ash (slag) system ash (slag) water ratio = ash and slag amount: grey water system water replenishment = 35.45: 376.26 = 1:10.6 where: grey water system water replenishment = 1, No. 2 Total amount of water to the furnace ash No.-1, No.2 furnace fixed row desuperheating water consumption +1 No.2 water tank replenishment amount +1, No. 2 furnace slag machine sealing water consumption + No. 2 furnace air compressor cooling water consumption = 376.26t/h(5) Circulating water system discharge rate: sewage rate = Sewage volume æ€»é‡ circulating water total = 0.658% In the formula: total circulating water = 64500t / h sewage volume = 1, No. 2 machine to furnace ash total water = 424.3t / h water consumption index analysis of the above calculated power generation operation The water consumption is 3.07kg/kWh, which is lower than the designed value of 4.3kg/kWh; the power consumption of power generation is 0.78m3 (s.GW), which is also lower than the design value.
Water tower drift loss and leakage loss 1.15% According to the relevant design data, when the circulating water temperature rises by 10 °C in the fall, the loss is 1.2%. During the test, the circulating water temperature of Unit 1 rises by 10 °C, and the circulating water temperature of Unit 2 rises by 13 °C, and the loss is only 1.15%, indicating that the water tower dewatering effect is good.
From the water balance test data, the water supply rate of No.1 and No.2 furnace ash (slag) system is 1:10.6. For each ton of ash and slag, 10.6 tons of circulating water should be added to the grey water system, and the normal hydration ratio is 1. : 3, if the water is replenished according to the actual calculated water supply rate, it will cause excessive gray water, discharge to the river and pollute the environment.
The water-saving measures of the industrial water system compare the water consumption indicators of the same type of 300MW units. The installed water consumption of several power plants was: 0.85m3/(s.GW) for Shiheng Power Plant and 0.93m3/ for Zouxian Power Plant (4×300MW). (s.GW), Texas Power Plant 0.98m3/(s.GW).
It can be seen from the calculation results of the water balance test that the water consumption index of the power plant is smaller than the design value and other manufacturers of the same type, indicating that its water management work is better, and the current urgent need to improve the gray water system and auxiliary machine water system.
The 300 MW unit grey water system of the power plant has excess water and drains 125.5 tons per hour to the river. This contradiction is more obvious with the improvement of coal quality. Efforts should be made to reduce the water supply of the grey water system. For example, the ratio of ash and slag to water is reduced to 1:3, zero discharge of the grey water system can be achieved. The main reason for the large grey-water ratio is that the water that is discharged into the mortar system is not recovered, resulting in an increase in the amount of ash-washing water and an increase in mortar discharge.
During the test, the water supply of the 300MW unit grey water system comes from No. 1 furnace flue fan water, 2 furnace air compressor cooling water return water, No. 1 shaft seal pump water, No. 1 and No. 2 furnace slag machine seal water, 1 No. No. 1 water tank hydration, these users except the No. 1 furnace fan, the water source of other users can not be replaced by recycled water, only work to reduce the amount of water. In order to reduce the amount of water replenishment in the grey water system, the following work was carried out: (1) circulating water discharge as water for the flue gas turbine, and finally water replenishment in the grey water system. In addition, research on high-concentration rate operation technology of circulating water to achieve a ratio of grey water 1: The design goal of 3 is the main way for power plants to save water and reduce the amount of pollutants discharged.
(2) The flow rates of the No. 1 and No. 2 shaft seal pumps are 26t/h and 76t/h, respectively. The deviation is large because the operating personnel prevent the outlet pressure of the No. 2 shaft seal pump from being too high and prevent the fouling of the ash pool. Open the pump outlet to the flushing gate. For example, the No.1 and No.2 shaft seal pump outlets are equipped with a communication pipe. Only one shaft seal pump can be operated during operation to meet the operation requirements. One 22kW pump can be deactivated and the circulating water supply can be reduced by about 50t/h. .
(3) The cooling water from the No. 1 and No. 2 furnace air compressors is returned to the water pump circulation pump suction well.
After taking the above three measures, at least reduce the water replenishment of the grey water system by about 400t/h.
(4) At present, No. 1 furnace only uses air compressor cooling water return water, No. 1 and No. 2 furnaces, and the total amount of desuperheated water is about 150t/h. The water is discharged to the rainwater well, and the water is recycled, which is equivalent to a reduction of 150t/ h city water, saving water costs about 200,000 yuan. To this end, the operation should be strictly controlled, adjust the desuperheating water flow of the fixed discharge container, the No. 1 furnace air compressor cooling water is changed to the No. 1 machine circulating water suction well, the No. 1 furnace is only connected to the air compressor cooling water to No. 1 clear water tank. After this measure is realized, the output of the industrial water pump can be reduced by 21t/h, and an industrial water pump can be operated to avoid the air consumption of the 22kW motor.
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