Integral type continuous sewage discharging system of waste heat boiler

Abstract

The invention relates to an integral type continuous sewage discharging system of a waste heat boiler. The integral type continuous sewage discharging system comprises a high-pressure steam drum, a low-pressure steam drum, a continuous sewage discharging tank with a high-pressure continuous sewage discharging inlet, and a high-pressure continuous sewage discharging pipe with one end communicating with the high-pressure steam drum and the other end communicating with the continuous sewage discharging tank through the high-pressure continuous sewage discharging inlet, wherein a high-pressure throttling device and a high-pressure continuous sewage discharging valve are arranged on the high-pressure continuous sewage discharging pipe; and the continuous sewage discharging tank is fixedly arranged at the top of the low-pressure steam drum and integrally communicates with the low-pressure steam drum through a connection pipe. According to the integral type continuous sewage discharging system of the waste heat boiler, the continuous sewage discharging tank integrally communicates with the low-pressure steam drum; compared with the prior art, the high-pressure continuous sewage discharging has the advantages that more full flash evaporation can be realized in the continuous sewage discharging tank, heat of the high-pressure continuous sewage discharging and a working medium can be recycled to the maximum extent, and the effects of saving energy and improving efficiency are achieved; and meanwhile, the integral type continuous sewage discharging system is simple in structure, convenient to control and lower in manufacturing cost and operation and maintenance cost.

Description

technical field [0001] The invention relates to a sewage discharge system of a waste heat boiler, in particular to an integrated continuous sewage discharge system of a waste heat boiler. Background technique [0002] As the country's air quality requirements are getting higher and higher, especially the emphasis on PM2.5 indicators, more and more coal-fired units are replaced by efficient gas-steam combined cycle units. In order to improve combined cycle efficiency, combined cycle waste heat boilers are usually set up for multi-pressure systems, such as dual-pressure systems, triple-pressure systems, etc. In order to recover part of the heat in the medium and high pressure continuous blowdown, the waste heat boiler is usually equipped with a continuous blowdown system. When the continuous sewage system is running (if attached figure 1 As shown), the continuous blowdown of the high-pressure steam drum 1 is discharged into the continuous blowdown tank 3 through the high-pre...

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Problems solved by technology

[0003] The present invention mainly solves the technical defects in the prior art that the heat and working medium of high-pressure continuous sewage discharge cannot be fully recovered, the system structure is complicated, it is not easy to be flexibly controlled, and the cost of manufacturing and operation and maintenance is high, and it provides a high-pressure continuous sewage discharge heat and Integral continuous sewage discharge system for waste heat boilers with sufficient recovery of working fluid, simple system structure, convenient control, and low manufacturing and operation maintenance costs

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