Coke oven ascension pipe crude gas waste heat recycling system

Abstract

The invention discloses a coke oven ascension pipe crude gas waste heat recycling system. The waste heat recycling system comprises an ascension pipe heat exchanger. The ascension pipe heat exchanger comprises an outer sleeve, and the inner wall of the outer sleeve is connected with an inner sleeve to form a double-sleeve structure. A center pipe is disposed in the center of the inner sleeve. A diffluence and confluence channel is disposed at the bottom of the outer sleeve, the inner sleeve and the center pipe. The inner wall of the inner sleeve and the outer wall of the center pipe are respectively provided with a heating surface. The connecting portion at the top of the outer sleeve and the inner sleeve is provided with a bellows baffling area. The top of the center pipe is provided with a center pipe baffling area. The outer sleeve, the inner sleeve and the center pipe are respectively provided with a spiral backflow channel. On the premise that a coke oven is safely operated and other technology requirements for the crude gas can be met, more than 60% of the crude gas can be recycled by the ascension pipe heat exchanger effectively, the amount of ammonia for cooling the crude gas is reduced, and the amount of poisonous and harmful waste water in the crude gas purifying process is reduced.

Description

technical field [0001] The invention relates to a waste heat recovery device for raw gas overflowing during the coking process, in particular to a waste heat recovery system for raw gas in a coke oven riser. Background technique [0002] The efficient recovery and utilization of waste heat resources generated in the coking process is the main direction of building a resource-saving and environmentally friendly green coking plant for energy conservation, and it is also one of the main ways to reduce coke oven energy consumption. However, my country's exploration of the quality potential of secondary energy, the development of value, and the development of supporting technologies and equipment for the utilization of low-quality waste heat and waste energy are lagging behind. For example, waste heat resources at 250-300 °C have not been effectively utilized. [0003] At present, 30% of the waste heat and waste energy in iron and steel enterprises have not been recycled. Among t...

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Problems solved by technology

[0004] In order to solve the problem of wasting waste heat from raw gas in the current coking process, the present invention provides a coke oven rising pipe waste heat recovery system for raw gas, which is used to recover waste gas that escapes from the coke oven carbonization chamber through the rising pipe. 650℃~700℃ raw coal gas brings out heat, which accounts for 36% of the total input heat of the coke oven

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