Recycling device and system for crude gas waste heat of coke oven

Abstract

The invention discloses a recycling device and system for crude gas waste heat of a coke oven. The recycling device for crude gas waste heat of the coke oven comprises an inner barrel and an outer barrel which are concentrically arranged in a sleeving manner inside and outside, wherein the axes of the inner barrel and the outer barrel extend up and down; connecting flanges are arranged at the upper and lower ends of the inner barrel and the outer barrel; a crude gas inlet is formed in the lower end of the inner barrel; a crude gas outlet is formed in the upper end of the inner barrel; the space between the inner barrel and the outer barrel is filled with a heat-conducting material layer; a spirally arranged heat exchange pipe is arranged in the heat-conducting material layer; the heat exchange pipe is a spiral coil; the axis of the spiral coil coincides with the axes of the inner barrel and the outer barrel; a medium inlet is formed in the lower end of the heat exchange pipe; and a medium outlet is formed in the upper end of the heat exchange pipe. According to the recycling device and the recycling system for crude gas waste heat of the coke oven, the spiral coil-type heat exchange pipe is utilized, enough heat exchange area can be arranged on the limited length, the diameter of the heat exchange pipe can be decreased, water supply and steam pressure is improved, high-level steam is produced, and the defect that only low-pressure steam can be produced through a water jacket structure is overcome; and the heat-conducting material layer is arranged, so that the coking problem caused by low temperature of the inner wall is solved.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, in particular to a waste heat recovery device and system of coke oven waste gas. Background technique [0002] my country is a country with a large coke production capacity. In 2016, my country had 1,420 coke ovens of various types, with a coke output of 449.1 million tons. In addition to the heat dissipation on the surface of the coke oven body, the coke oven waste heat is mainly composed of the following three parts: (1) The high-temperature waste heat from the 950℃~1050℃ red coke pushed out from the coke oven carbonization chamber accounts for about 37.52% of the coke oven expenditure heat; (2) The medium-temperature waste heat brought out by raw coal gas at 650-700°C accounts for about 33.76% of the coke oven expenditure heat; (3) the low-temperature waste heat brought out by the coke oven flue gas at 260°C accounts for about 18.15% of the coke oven expenditure heat. ...

AI Technical Summary

Problems solved by technology

To sum up, there are the following technical key points or difficulties: (1) When the raw gas temperature is lower than a certain value, graphite deposition, tar precipitation, and serious coking and coking are easy to occur, resulting in reduced inner wall space and lower heat transfer coefficient; (2) The coke oven itself There are load and space limitations; (3) The heat transfer coefficient of the raw gas side is low, and the recovered heat is less; (4) During the process of waste heat recovery, the heat exchange medium is easy to leak, which affects the safety of the carbonization chamber

[0004] There are some waste heat recovery technologies for raw coal gas. According to the structure, there are water jacket structure, heat pipe structure, coil structure, etc., and according to the cooling medium, there are water, heat transfer oil, molten salt, nitrogen, etc. The advantages and disadvantages of these methods have not achieved satisfactory results, so they have not been promoted in large-scale projects.

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