Efficient gas turbine inlet-gas cooling device with seawater cooling and mixing cold source

Abstract

The invention relates to an efficient gas turbine inlet-gas cooling device with a seawater cooling and mixing cold source. The efficient gas turbine inlet-gas cooling device comprises a gas turbine (1), a waste heat boiler (2), a steam turbine (3), a steam type lithium bromide chiller (4), a steam desuperheater (5), a surface air cooler (6), a large-temperature-difference seawater heat exchanger (7), a centrifugal type electric refrigerator (8), a seawater source (9), a cooling water pump (10), a cold water pump (11), a seawater pump (13) and a pressure reducing valve (14). The sets of equipment are connected with relevant pipelines, and controlled and adjusted by special control systems. The steam turbine (3) of a seaside combined-cycle power plant is used for performing steam extraction to drive the lithium bromide chiller (with high-temperature cooling water) to produce high-temperature cold water, and the high-temperature cold water is combined with low-temperature cold water produced by the centrifugal type electric refrigerator (with low-temperature cooling water) with high cold capacity to form large-temperature-difference cold water for cooling gas turbine inlet-gas, so that the power generation power and the efficiency of the power plant are improved. The efficient gas turbine inlet-gas cooling device has the advantages of low comprehensive energy consumption, large inlet-gas temperature drop, low manufacturing cost, small occupied area and the like, and has a wide application prospect to the fields of energy conservation and beneficiation of the large-size seaside combined-cycle power plant in hot seasons.

Description

technical field [0001] The invention relates to a cooling device, in particular to a high-efficiency gas turbine inlet cooling device for seawater cooling and mixed cold source, and belongs to the technical field of gas turbine energy-saving and efficiency-enhancing equipment. Background technique [0002] Gas turbine intake air cooling technology is an effective means to solve the insufficient output and efficiency drop of gas turbines in high temperature seasons. For large gas-steam combined cycle power stations by the sea, the traditional steam-driven gas turbine intake air cooling devices generally include gas turbines, waste heat Boilers, steam turbines, steam refrigerators and other structures can alleviate the problem of insufficient gas turbine output during high temperature periods, but there are three main problems at the same time: 1. The comprehensive energy consumption of the gas turbine air intake cooling device is high. For steam combined cycle power plants, a...

AI Technical Summary

Problems solved by technology

[0002] Gas turbine intake air cooling technology is an effective means to solve the insufficient output and efficiency drop of gas turbines in high temperature seasons. For large gas-steam combined cycle power stations by the sea, the traditional steam-driven gas turbine intake air cooling devices generally include gas turbines, waste heat Boilers, steam turbines, steam refrigerators and other structures can alleviate the problem of insufficient gas turbine output during high temperature periods, but there are three main problems at the same time: 1. The comprehensive energy consumption of the gas turbine air intake cooling device is high. For steam combined cycle power plants, although the traditional steam-driven gas turbine air intake cooling device uses steam turbine extraction for refrigeration, the primary energy consumption in the refrigeration link is not large, but due to the temperature difference between the cold water of the conventional steam-type bromine cooler Small, generally no more than 10°C, which makes the delivery power of the cooling water pump large; the temperature difference of the cooling water is small (generally no more than 6°C), the condensation heat is large, and the delivery power of the cooling water and seawater circulation pump is greater, especially when the power plant is farther from the sea. When the seawater pump is far away (some kilometers or tens of kilometers away), the delivery power of the seawater pump is extremely high

Therefore, the comprehensive energy consumption of gas turbine air intake cooling device is high

2. The gas turbine air inlet cooling device has a large investment. For large gas-steam combined cycle power stations on the seashore, the traditional steam-driven gas turbine inlet cooling device adopts a small temperature difference method for cold water, cooling water, and seawater circulation, so the cooling , cooling water, seawater pipelines and pumps require a lot of investment; in addition, the cooling capacity of a steam-type bromine chiller cannot be made very large, generally no more than 5 million kcal / hour (this kind of capacity needs to be transported separately, and the on-site Assembly), the cost per unit of cooling capacity is high; the above two factors also lead to an increase in the project’s investment in civil engineering, and the investment in the entire gas turbine intake cooling device is relatively high

3. The air intake cooling device of the gas turbine occupies a large area. For the large gas-steam combined cycle power station at the seaside, the traditional steam-driven air intake cooling device of the gas turbine is too large in volume and size due to the steam-type bromine cooler. It occupies a large area, and it is difficult to find a large enough place to arrange a refrigeration room in some areas where the plant area is tight

[0003] The deficiencies in the above three aspects have greatly reduced the economics of the project and affected the promotion prospect of the gas turbine air intake cooling technology in the high temperature season of the seaside large gas-steam combined cycle power station

Images