Double pressure dry-extinguishing coke waste heat boiler

Abstract

The invention relates to a dual-pressure DQC residual heat boiler that comprises a flue gas system, a high-pressure boiler barrel, a high-pressure evaporator, a high-pressure economizer, a superheater and a water-cooling wall and etc. A flue gas channel in the flue gas system is composed of a low-pressure self-deoxidizer system at the outlet of the high-pressure economizer; the low-pressure self-deoxidizer system is provided with a low-pressure evaporator; the inlet and outlet to the low-pressure evaporator are respectively connected with the low-pressure boiler barrel through a low-pressure evaporator descending pipe and a low-pressure evaporator flow riser; the lower part of the low-pressure evaporator is composed of the low-pressure economizer; the inlet to the low-pressure economizer is linked to the boiler water supply pipe; the outlet is connected with the low-pressure boiler barrel through the outlet pipe; the low-pressure boiler barrel is mounted with a deoxidizer head and a high-pressure delivery pipe; the area between the inlet and outlet to the low-pressure economizer is composed of a bypass pipeline; the bypass pipeline is provided with a circulating pump and a governor valve; the area between the low-pressure evaporator and the low-pressure evaporator descending pipe is composed of a low-pressure evaporator inlet collection tank; the area between the low-pressure evaporator and the low-pressure evaporator flow riser is composed of a low-pressure evaporator outlet collection tank. The invention effectively resolves the problems in prior arts of low heating efficiency and too much land resources.

Description

technical field [0001] The invention relates to a waste heat boiler, in particular to a dual-pressure CDQ waste heat boiler with a small system footprint and high energy efficiency. Background technique [0002] In the modern coke quenching process, there are two kinds of wet coke quenching and dry coke quenching. In wet coke quenching, the waste heat cannot be used, the quality of coke is poor and the environmental pollution is serious; in dry coke quenching, the gas can be recycled, The quality of coke is more guaranteed. Since the gas recycling basically does not pollute the environment, wet coke quenching is gradually replaced by dry coke quenching. CDQ technology is one of the new energy-saving and environmental protection technologies developed by metallurgical enterprises and coking enterprises in the past ten years. It has good social and economic benefits, and relevant enterprises in various countries are competing to adopt it. As an important part of the CDQ devic...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low thermal efficiency and the need to occupy a lot of land resources in the prior art, the present invention provides a dual-pressure CDQ waste heat boiler that occupies less land and has high energy efficiency.

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