Method for efficiently preheating coke oven gas

Abstract

The invention discloses a method for efficiently preheating coke oven gas. The coke oven gas is subjected to preheating treatment by flue gas or waste gas with the temperature of above 1,150 DEG C, and the flue gas or the waste gas and the coke oven gas are subjected to countercurrent heat exchange, wherein the preheating treatment comprises convection preheating treatment and radiation preheating treatment which are performed sequentially; after the convection preheating treatment, the coke oven gas is preheated to 500 to 600 DEG C; and after the radiation preheating treatment the coke oven gas is continuously preheated to 800 to 950 DEG C. The coke oven gas is preheated by completely utilizing the sensible heat of high-temperature flue gas or tail gas, so that the preheating time is short, the preheating temperature is high, the automatic control can be realized basically, the heat efficiency is high, and operation safety and reliability are achieved. High-temperature decomposition of hydrocarbon in the coke oven gas and carbon deposition can be effectively prevented by adding a trace amount of a carbon deposition inhibitor and a decarbonizer, and the application range is wide.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and more specifically relates to a method for efficiently preheating coke oven gas by utilizing high-temperature flue gas or waste gas in related processes in the field of metallurgy and chemical industry. Background technique [0002] In industrial production, when the entire production system or a reactor in the system must use gas as the reduction reaction medium under reducing conditions and maintain the heat balance of the system to ensure the progress of the reduction reaction, the gas must be preheated quickly and efficiently. For example, in the process of using titanium concentrate to prepare artificial rutile, in order to improve the quality of artificial rutile, Fe in the modified titanium concentrate must be 2 o 3 Reduction to FeO to improve the removal rate of impurity element iron in titanium concentrate; in the process of producing iron concentrate from low-grade ir...

AI Technical Summary

Problems solved by technology

However, most of the methods currently used in industry preheat the combustion air or blast furnace gas, and the preheating temperature is relatively low, usually below 500°C. There is basically no preheating of coke oven gas. Influence of gas properties, hydrocarbons in coke oven gas at high temperature (C n h m and CH 4 ) will decompose to form carbon deposits and adhere to the gas pipeline, seriously affecting the continuous and stable operation of the system; in addition, coke oven gas has a high calorific value, and leakage is likely to cause major accidents such as explosion and poisoning, and the safety is poor. There are basically no related methods and devices for high-temperature preheating of coke oven gas, and the method of preheating combustion-supporting air and blast furnace gas cannot be used for coke oven gas preheating at all

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