Method for utilizing waste heat of low-concentration combustible materials in tail gas of Slapple furnace

Abstract

The invention provides a method for utilizing waste heat of low-concentration combustible materials in tail gas of a Slapple furnace. The technical scheme includes that the low-concentration tail gas with a heat value lower than 450Kcal / m<3> flows into a 'U'-shaped settling chamber (5), is subjected to inertial separation and then flows into a secondary combustion chamber (6), air is distributed in the secondary combustion chamber by the aid of an air distribution chamber (7) and is ignited by a heat accumulator (16) with the temperature ranging from 400 DEG C to 600 DEG C, the combustible tail gas is ignited, is sufficiently combusted in a combustion chamber (8) with a long flue and is gradually expanded in the long flue, combusted high-temperature flue gas flows into a heat-pipe heat exchanger (10) at a low flow rate, internal resistance of the heat exchanger is lower than 10mmH<2>O, a coal economizer (13) performs heat exchange, the tail gas flows through desulfurization dust removal equipment (15) and then is exhausted into the atmosphere, and high-grade steam generated in a waste heat boiler (9) flows to a heat accumulation chamber (2) to be supplied to the Slapple activation furnace (1), so that activated carbon can be manufactured. The method has the advantages that the low-grade waste heat can be sufficiently utilized, pollution emission can be reduced, and a system is high in reliability and can be operated and maintained easily and conveniently.

Description

[0001] The present invention is a divisional application with the application number 201210048224.0 and the title of the invention "A System and Method for Utilizing Waste Heat of Low-Concentration Combustibles in Sleep Furnace Tail Gas". technical field [0002] The invention relates to a waste heat utilization method of low-concentration combustibles, in particular to the field of waste heat utilization and purification of low-concentration tail gas of a Sleep activation furnace. Background technique [0003] In the process of producing activated carbon by using the Sleep furnace, coal reacts with oxygen or hydrogen or water vapor at high temperature to produce special gas, liquid or solid products, produces a large number of gas by-products, and releases a large amount of heat. At the same time, it will produce low-concentration combustible gas and solid combustible tail gas. Because of its low concentration and temperature, the calorific value is less than 400Kcal / Nm 3 ,...

AI Technical Summary

Problems solved by technology

At present, most of them adopt the method of directly exhausting the atmosphere, which not only pollutes the atmosphere but also causes energy waste.

The invention patent CN200810119157.0 "Comprehensive Utilization Method of Activation Furnace Flue Gas" and the methods adopted in the existing literature do not involve the supplementary combustion and incineration of low-concentration tail gas combustibles, and cannot make full use of the low-concentration combustibles in the tail gas

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