Temperature regulating system based on combined cycle generating unit and control method

Abstract

The invention discloses a temperature regulating system based on a combined cycle generating unit. The temperature regulating system is characterized in that an air outlet end of an air heat exchangeris connected with an inlet end of the combined cycle generating unit, and a flue gas inlet end of a hot water generator is connected with an outlet end of the combined cycle generating unit; a wateroutlet end of the hot water generator is connected with a water inlet end of a water tank, and the water tank is connected with the air heat exchanger through a first valve; a first water inlet end ofa low-temperature hot water lithium bromide refrigerator is connected with the water tank through a second valve, and a first water outlet end of the low-temperature hot water lithium bromide refrigerator is connected with the hot water generator; a second water outlet end of the low-temperature hot water lithium bromide refrigerator is connected with the air heat exchanger, and the air heat exchanger is connected with a second water inlet end of the low-temperature hot water lithium bromide refrigerator through a fourth valve; and the low-temperature hot water lithium bromide refrigerator isconnected with a cooling tower, and a third valve is connected with a water outlet end of the air heat exchanger and a water inlet end of the hot water generator.

Description

technical field [0001] The invention relates to the field of combined cycle generating sets, in particular to a temperature regulation system and control method based on combined cycle generating sets. Background technique [0002] Because gas turbines have the advantages of high efficiency, low cost, environmental friendliness, less land occupation, and flexible control, gas-steam combined cycle units or polygeneration projects with gas turbines as the main engine have become power generation projects actively developed by countries all over the world to achieve energy conservation and emission reduction. technology. [0003] With the development of society, human's demand for energy is increasing day by day. Since in China, the operation mode of gas-steam combined cycle units is not only used for heat supply, but also used for peak regulation and frequency regulation of the power grid, and the annual operating hours are also strictly controlled, so the generating units ar...

AI Technical Summary

Problems solved by technology

[0012] However, the biggest disadvantage of this technical solution is that 1) the intake air cooling system can only be put into operation in high temperature environment in summer to improve the output and efficiency of the combined cycle. The time is very short, and the increase in the average annual operating efficiency of the combined cycle unit of the power plant is limited; 2) The lithium bromide refrigerator uses the steam extracted from the steam turbine as the driving steam source, and its energy grade is high. The output and efficiency of the steam turbine are reduced. Although the output and efficiency of the gas turbine are increased, the efficiency of the overall combined cycle is not significantly improved; 3) Since the entire set of refrigeration system equipment is not in operation for a long time, there is equipment investment but no profit for a long time, resulting in The equipment investment payback period is long; 4) It can only cool the inlet air of the gas turbine, but cannot heat the inlet air, and lacks the flexible adjustment of the combined cycle system

5) Unable to respond to the requirements of the power grid to increase or decrease unit output, lacking the means to respond to power grid dispatching

[0014] However, the disadvantage of this technical solution is that it is only suitable for the autumn and winter seasons when the temperature is low, and it can be put into use for a short period of time in areas where the annual average temperature is not cold, which affects the availability of the unit and also affects the use of waste heat to improve the efficiency of the combined cycle. Effect

Especially in hot summer, when the power grid requires gas turbines to operate at full load, the overall output of the combined cycle system will not rise but fall, resulting in a shortage of power supply, and the output of the unit cannot be accurately quantitatively adjusted, but the output of the unit can only be qualitatively reduced

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