Dry quenching subcritical ultrahigh temperature reheating boiler thermal system

Abstract

The invention relates to waste heat recycling in the technical field of coking and metallurgical engineering, in particular to a dry quenching subcritical ultrahigh temperature reheating boiler thermal system. The dry quenching subcritical ultrahigh temperature reheating boiler thermal system is characterized by at least comprising a deaerator, a deaerator water tank, a boiler feed pump, a dry quenching boiler and a boiler steam drum; a high-temperature superheater, a low-temperature superheater, a light pipe evaporator, a fin evaporator and a fin economizer are distributed between a smoke inlet and a smoke outlet of the dry quenching boiler at intervals from top to bottom; and a steam reheater is arranged between the high-temperature superheater and the low-temperature superheater, and the high-temperature superheater is close to the lower end of the smoke inlet and at least comprises two external pipelines. The dry quenching subcritical ultrahigh temperature reheating boiler thermalsystem can bring higher economic benefits so that main steam generating subcritical ultrahigh temperature parameters of the dry quenching boiler can generate reheat steam, and the power generation efficiency can be improved by 10% or higher.

Description

technical field [0001] The invention relates to waste heat recovery in the technical fields of coking and metallurgical engineering, in particular to a thermal system for CDQ subcritical ultra-high temperature reheating boilers. Background technique [0002] The CDQ boiler is the core equipment to realize heat energy conversion in the CDQ process. The main function of the CDQ boiler is to reduce the temperature of the inert circulating gas in the CDQ system and absorb its heat, and generate steam for heating and power generation, so as to achieve The heat of the inert cycle gas is effectively utilized to save energy. [0003] Under the action of the circulating fan, the inert circulating gas cools the red-hot coke at about 1000°C in the dry quenching tank, and the inert circulating gas absorbing the sensible heat of the coke is heated to 880-960°C, and the high-temperature inert circulating gas is dedusted by the primary dust collector After that, it enters the CDQ boiler, ...

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Problems solved by technology

[0006] The problems of the conventional CDQ boiler thermal system are as follows: 1. The deoxygenation capacity of the atmospheric deaerator cannot meet the boiler feed water requirements, and it is necessary to cooperate with deoxidation and dosing; 2. The heat of the CDQ circulating gas is not fully utilized, resulting in The steam parameters are low, and the power generation efficiency is low; 3. The conventional boiler is not equipped with a reheater, which cannot achieve the effect of more effective use of circulating gas; 4. The exhaust gas temperature of the conventional boiler is high, and the heat loss is large

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