Water supply system for combined cycle heat recovery boiler

Abstract

The invention relates to a water supply system for a combined cycle heat recovery boiler. The water supply system for the combined cycle heat recovery boiler comprises a water supply main path formed by a condensate pump, a condensate heater, a low-pressure water supply operation board and a low-pressure steam drum which are connected with one another sequentially, a middle-pressure water supply branch path formed by a middle-pressure water supply pump, a middle-pressure coal economizer, a middle-pressure water supply operation board and a middle-pressure steam drum which are connected with one another sequentially and a high-pressure water supply branch path formed by a high-pressure water supply inlet end, a high-pressure water supply speed regulation device, a high-pressure water supply pump, a high-pressure water supply operation board, a high-pressure coal economizer and a high-pressure coal steam drum which are connected with one another sequentially; the middle-pressure water supply pump is connected with the outlet end of the low-pressure steam drum; and the high-pressure water supply inlet end is connected with the outlet end of the middle-pressure coal economizer. According to the water supply system, water supplied by a high-pressure system is from the outlet end of the middle-pressure coal economizer to enable the flow rate of the middle-pressure water supply pump to be greatly increased, the lift of the high-pressure water supply pump to be greatly lowered and the running efficiencies of the middle-pressure water supply pump and the high-pressure water supply pump to be both greatly improved, thus the power consumption of a unit is effectively lowered, and the running benefit of a furnace island is increased.

Description

technical field [0001] The invention relates to a water supply system for a combined cycle waste heat boiler. Background technique [0002] With the gradual advancement of the industrialization process since the country's reform and opening up, especially the rapid development of high energy-consuming heavy industries, gas-steam combined cycle generator sets have been popularized and used because of their advantages of high efficiency and low emissions, such as 9E, 9F, etc. Large-scale gas-steam combined cycle units have gradually become a beneficial and important supplement to the power system. In order to realize the cascaded utilization of waste heat, the current 9F combined cycle waste heat boilers generally adopt a three-pressure system. The water supply system of the combined cycle waste heat boiler adopting the three-pressure system is as attached figure 1 As shown, the condensed water enters the main water supply road 1 through the condensate pump 12, and then enter...

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Problems solved by technology

[0006] The present invention mainly aims to solve the technical defects of high investment cost, low operating efficiency of medium and high pressure feed water pumps, high energy consumption and short service life in the operation of the unit in the prior art, and provides a low investment cost, in-unit operation Feed water system of combined cycle waste heat boiler with high operating efficiency, low energy consumption and long service life of medium and high pressure feed water pump

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