Double pressure dry-extinguishing coke waste heat boiler

Abstract

The invention relates to a double-pressure dry quenching coke waste heat boiler. It consists of a flue gas system, a high-pressure drum, a high-pressure evaporator, a high-pressure economizer, a superheater and a water wall. The flue gas channel of the flue gas system is equipped with a low-pressure self-deoxygenation system at the outlet of the high-pressure economizer, and a low-pressure evaporator is installed on the low-pressure self-deoxygenation system. The rising pipe of the low-pressure evaporator is connected to the low-pressure drum, and a low-pressure economizer is installed under the low-pressure evaporator. The inlet of the low-pressure economizer is connected to the boiler water supply pipe, and the outlet is connected to the low-pressure drum through the outlet pipe. There is a bypass pipe between the inlet and outlet of the low-pressure economizer, and a circulating pump and a regulating valve are installed on the bypass pipe; a low-pressure evaporator is installed between the low-pressure evaporator and the downcomer of the low-pressure evaporator The inlet header, the outlet header of the low-pressure evaporator is arranged between the low-pressure evaporator and the rising pipe of the low-pressure evaporator. The invention effectively solves the problems of low thermal efficiency and the need to occupy a lot of land resources in the prior art.

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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