System for recycling raw gas afterheat of coke oven

Abstract

The invention discloses a system for recycling the raw gas afterheat of a coke oven, and belongs to the technical field of the recycling utilization of raw gas afterheat. The system for recycling the raw gas afterheat of the coke oven comprises a heat exchange medium circulating system and a water charging system, wherein the heat exchange medium circulating system comprises a heat exchanger set, a steam pocket and a forced circulation pump, a water inlet of the heat exchanger set is connected to a water outlet of the steam pocket through the forced circulation pump, a water outlet of the heat exchanger set is connected to a water inlet of the steam pocket, and a steam outlet in the steam pocket is connected to an external steam pipe network; the water charging system comprises a buffer water tank, a make-up pump, a feed pump and a desalting oxygen removal water tank, the feed pump is arranged between the buffer water tank and the desalting oxygen removal water tank, and the buffer water tank is connected to the steam pocket through the make-up pump. The system can be used for effectively, safely and reliably recycling the raw gas afterheat and circularly converting a heat exchange medium into middle and low pressure steam; the system operation can be effectively detected and controlled, so that the safe and normal operation of the system is ensured, and the accident rate is reduced.

Description

Technical field [0001] The invention relates to a waste heat recovery and utilization system, more specifically, to a coke oven raw gas waste heat recovery and utilization system. Background technique [0002] Efficient recovery and utilization of waste heat resources generated in the coking process is the main direction for the establishment of resource-saving and environmentally friendly green coking plants and one of the main ways to reduce energy consumption of coke ovens. However, my country’s exploitation of secondary energy quality potential, value development, and low-quality waste heat and waste energy utilization support technology and equipment development are lagging behind. The waste heat of high-temperature coke oven raw gas in the riser has not been effectively used, and only circulating ammonia can be used. Cooling wastes heat in vain. Someone exchanges heat between raw gas and the process medium water in the jacket, but the heat exchange surface is stuck with tar...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing waste heat recovery and utilization system of raw coke oven gas, which is easy to coke and block, has a great impact on the external environment, and is not ideal for high temperature treatment and the use of heat exchangers in the process of starting and stopping, and provides A coke oven raw gas waste heat recovery and utilization system adopts the technical solution provided by the invention, which not only ensures the heat exchange effect, effectively, safely and reliably recovers the waste heat of the raw gas, but also can cyclically convert the heat exchange medium into medium and low pressure Steam can fully recycle and utilize the waste heat of raw gas, and at the same time, it can also effectively detect and control the operation of the system to ensure the safe and normal operation of the system and reduce the incidence of accidents

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