Method for optimizing generator set cold end system with counter-flow mechanical draft cooling tower
A ventilation cooling and system optimization technology, applied to steam/steam condensers, heat exchange equipment, lighting and heating equipment, etc., to achieve the effect of low coal consumption rate for power supply
Active Publication Date: 2021-09-03
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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Problems solved by technology
The existing cold-end system optimization methods generally only adjust the operation mode of the circulating water pump, and cannot comprehensively consider the condenser, circulating water pump and counterflow mechanical ventilation cooling tower
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[0116] Taking a 200MW gas-steam combined cycle generator set in a power plant as an example, the dry bulb temperature of the atmosphere is 31.1°C, the wet bulb temperature is 27.1°C, and the atmospheric pressure is 99.3kPa. The cold end system of the unit consists of 1 condenser, 4 The circulating water pump of the same type and 6 cooling tower fans of the same type are composed. The circulating water pump operates at power frequency, and the fans have no low-speed operation mode. The condenser data are shown in Table 1.
[0117] Table 1 Condenser data
[0118]
[0119] In addition, the correction coefficient in the HEI overall heat transfer coefficient calculation formula can be obtained by looking up the table or looking up the map.
[0120] According to the equipment type of circulating water pump and fan, there are 24 combinations in total. The conventional operation mode is 4 circulating water pumps and 6 fans, 3 circulating water pumps and 5 fans, 2 circulating water p...
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The invention discloses a method for optimizing a generator set cold end system with a counter-flow mechanical draft cooling tower. The method comprises the following steps of establishing a condenser thermal model; establishing a circulating water pump thermal model, and obtaining the relationship between the circulating cooling water flow and the power consumption of a circulating water pump under different circulating water pump operation modes through tests; establishing a mechanical draft cooling tower thermal model, and obtaining the relation between the cooling tower inlet air flow and the power consumption of a fan under different cooling tower fan operation modes through tests; and conducting cold end system optimization, specifically, aiming at the combination modes of the circulating water pump and the cooling tower fan, determining the circulating cooling water outlet temperature, the circulating cooling water inlet temperature and the condenser back pressure, and comparing the difference values between the power change values and the power consumption of the cold end system under various combination modes. According to the method, through variable working condition analysis of the condenser and the mechanical draft cooling tower, cold end system power consumption parameters and unit output parameters are obtained, and the optimal cold end system operation mode is sought to obtain the unit net output maximum value.
Description
technical field [0001] The invention relates to the field of energy saving and consumption reduction of generator sets, in particular to a method for optimizing the cold end system of a generator set with a counterflow mechanical ventilation cooling tower. Background technique [0002] The cold-end system of the combined cycle power generation, waste incineration power generation and biomass power generation units in the generating set generally includes the low-pressure cylinder of the steam turbine, the condenser, the circulating water pump and the counterflow mechanical ventilation cooling tower. For the specific layout, see figure 1 . With the increasingly urgent situation of energy saving and consumption reduction, many power plants at home and abroad have begun to optimize and transform the cold-end system in the power generation cycle. The optimization of the cold end system should determine the best operation mode of the cold end system on the basis of comprehensive...
Claims
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IPC IPC(8): F28B11/00F28F27/00
CPCF28B11/00F28F27/003
Inventor 宋金时钟平孟桂祥王安庆王峰聂雨韩国庆曹寿峰黄伟徐凯史燕红单绍荣郑磊张丁凡
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD