Integrated technique and special equipment for raw gas waste heat recovery and steam replacement with heat transfer soil

Abstract

The invention relates to an integrated technique and special equipment for raw gas waste heat recovery and steam replacement with heat transfer soil. The integrated technique and the special equipment are mainly characterized in that high-temperature separation heat pipes are used to recover latent heat of high-temperature raw gas from a coking chamber, the recovered heat is transmitted to heat transfer oil, the heated transfer oil supplies required heat to various coking procedures of chemical production operational units (an ammonia evaporation procedure, crude benzene distillation and refining procedures, a coke distillation procedure), the heat transfer oil in a whole chemical production system cycles in closed loops, and temperature and flow are regulated and controlled according different requirements of the units on operational heat sources. Compared with the prior art, the integrated technique and the special equipment can be used for efficiently recovering high-quality waste heat of raw coke oven gas, energy consumption of the coking procedure is reduced, consumption of circulating ammonia water in spraying is reduced, heat transfer oil heating systems for the chemical production operational units and addition heat required by the heat transfer oil heating systems are omitted, and closed-loop circulation of the heat transfer soil and cascade use of the waste heat are achieved.

Description

technical field [0001] The invention belongs to the technical field of efficient recovery and utilization of waste heat resources in metallurgical processes, and in particular relates to an integrated process method of efficient recovery and utilization of raw gas waste heat in coking process and heat transfer oil instead of water vapor based on energy saving and emission reduction. Background technique [0002] The waste heat resources brought out by coke oven products are mainly composed of two parts: one part is 37~42% of the sensible heat carried by 1000℃ red hot coke, and the other part is 30~34% of the sensible heat carried by 700~850℃ raw coal gas , the two together account for 65% to 75% of the total heat output of the coke oven. At present, the application of dry coke quenching technology has matured. Good recovery, while the raw gas contains complex corrosive substances (such as tar, SO 2 , NOx, dust, etc.) makes the recovery of this part of sensible heat has not ...

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Problems solved by technology

[0007] Purpose of the invention: Aiming at the deficiencies in the existing technology, the present invention proposes an integrated process method and special equipment for waste heat recovery of raw coal gas and heat transfer oil replacement, which integrates efficient recovery and utilization of gas waste heat resources and heat transfer oil instead of water vapor as a heat source. The purpose of this method is to solve the problems of waste of high-quality sensible heat and large consumption of cooling water in ammonia water cooling in the past, as well as the low recovery efficiency of the riser vaporization cooling device and the need to stop production from time to time. It not only recovers the sensible heat of raw gas, Moreover, the recovered waste heat is used as the heat source required for the operation of the chemical production unit, which realizes the closed-circuit circulation of the heat transfer oil in the entire chemical production system, and avoids the heat transfer oil heating system operated by the chemical production unit.

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