Regenerative system of low-pressure drain water cooler

Abstract

The invention provides a regenerative system of a low-pressure drain water cooler and a generator set. Low-pressure drain water in a low-pressure heater is heated through a low-pressure drain water cooler system by the aid of heat of the drain water in the low-pressure heater, and vapor generated after the drain water is vaporized by heating is guided back to the low-pressure heater. The problem of unsmooth drain water of the low-pressure heater can be solved, and indirect heating of condensation water, reduction of vapor extraction capacity and improvement of unit economy are achieved.

Description

technical field [0001] The invention relates to thermal power generation, in particular to a heat recovery system in thermal power generation equipment. Background technique [0002] In the heat recovery system of the current steam turbine power plant, between two adjacent low-pressure heaters, especially the last two low-pressure heaters 3-1 and 3-2 adopt a self-flowing drainage method step by step. 3-2 In the hydrophobic cooling section, use hydrophobic to heat the main condensed water, such as figure 1 As shown, so as to recover heat and achieve the purpose of improving the thermal economy of the unit. [0003] However, in many subcritical and supercritical units currently operating in China, the last two-stage low-pressure heaters often have the problem of poor drainage (mainly because the pressure difference between the two-stage low-pressure heaters is too small, resulting in insufficient pressure difference In order to overcome the resistance of the drain pipe and t...

AI Technical Summary

Problems solved by technology

[0003] However, in many subcritical and supercritical units currently operating in China, the last two-stage low-pressure heaters often have the problem of poor drainage (mainly because the pressure difference between the two-stage low-pressure heaters is too small, resulting in insufficient pressure difference In order to overcome the resistance of the drain pipe and the corresponding valve), many units need to open the emergency drain valve for a long time during normal operation or low-load operation, which causes heat loss and reduces the economical efficiency of the unit

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