High plus emergency drainage and decompression escape steam system

Abstract

The invention discloses a high-pressure heater emergency draining depressurization steam escaping system. The system comprises a high-pressure heater emergency draining steam escaping unit. A steam escaping port is formed in the upper end of a cylinder, and a draining port is formed in the lower end of the cylinder. A plurality of high-pressure heater emergency draining water inlet tubes are arranged in the middle of the cylinder. High-pressure heaters are connected with the high-pressure heater emergency draining water inlet tubes through high-pressure heater emergency draining valves. The high-pressure heater emergency draining steam escaping unit is connected with the gas inlet end of a deaerator and is connected with water inlet end of the deaerator through the draining port. By means of the system, the outlet pressure of the high-pressure heater emergency draining valves is improved from 0.005MPa to 1MPa, and the flow speed reduction amplitude of steam and water in tubes on the rear portions of the heater emergency draining valves are 99.6%, 99.6% and 99.8% respectively. The degree of scouring abrading of the gas and water to valve cores and valve seats of the emergency draining valves is reduced greatly, the emergency draining valve service life is prolonged, and the emergency draining valves tightness is improved.

Description

technical field [0001] The present invention relates to a high-pressure heater emergency drainage system, more specifically, it is a high-pressure heater emergency drainage and pressure reduction steam escape system. Background technique [0002] In the investigation of thermal power plants, it was found that the temperature of the protective shell of the emergency drainage pipes of the high-pressure heaters of some units was relatively high, indicating that the leakage of the emergency drainage systems of the high-pressure heaters was common. [0003] The thermal power units designed earlier in my country used vertical high-voltage heaters (such as figure 1 shown), arranged in the steam engine room, the emergency drain pipes of each high-pressure heater are combined after the emergency drain valve into one emergency drain pipe and connected to the regular blowdown and expansion vessel arranged in the boiler area. Its function is to act as a high-pressure heater. When the w...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the existing high-pressure heater emergency water trap is scoured by the two-phase flow of steam and water, and the problem of serious damage is provided by a high-pressure emergency water-drainage and decompression escape steam system.

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