Integrated system and process for flue gas waste heat utilization and dust removal from converter steelmaking

Abstract

The invention provides a waste heat utilization and dedusting integrated system and technology for flue gas generated from converter steelmaking. The system comprises a waste heat boiler, a dust remover and a gas recycling dispersing subsystem, wherein the waste heat boiler is used for dedusting flue gas generated from converter steelmaking and generating superheated steam through waste heat of flue gas; a flue gas side inlet of the waste heat boiler communicates with a vaporization cooling flue for converter steelmaking through an input pipeline; a steam side outlet of the waste heat boiler communicates with a steam inlet of a turbine; a water side inlet of the waste heat boiler communicates with a water supply source of the waste heat boiler; a flue gas inlet of the dust remover communicates with a flue gas side outlet of the waste heat boiler; and the gas recycling dispersing subsystem communicates with a flue gas outlet of the dust remover. The technology comprises the steps that flue gas enters the waste heat boiler to be in heat exchange with waste heat boiler feedwater of the waste heat boiler, after heat exchange, flue gas enters the dust remover to be subjected to dust removal, then, flue gas subjected to dust removal enters the gas recycling dispersing subsystem, waste heat boiler feedwater is changed into superheated steam, and superheated steam enters the turbine. According to the waste heat utilization and dedusting integrated system and the waste heat utilization and dedusting integrated technology, the energy efficiency index of converter steelmaking is improved, thermal efficiency is high, the service life of the dust remover is prolonged, maintenance is facilitated, investment is low, and benefits are high.

Description

technical field [0001] The invention relates to the field of flue gas waste heat recovery, in particular to an integrated system and process for flue gas waste heat utilization and dust removal generated in the iron and steel metallurgy intermediate converter steelmaking production process. Background technique [0002] In the industrial production of converter steelmaking, the carbon in the molten iron in the converter reacts with the oxygen sprayed into the converter by the oxygen lance to produce a large amount of carbon monoxide, a small amount of carbon dioxide and a very small amount of other oxides, which are then sprayed out from the converter mouth , These gases are collectively referred to as furnace gas; due to the oxygen lance sprayed into the oxygen flow, the steel slag is vigorously stirred, and part of the evaporated and splashed metal impurity oxides and loose raw material dust are ejected together with the furnace gas, these substances are collectively referr...

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Problems solved by technology

[0013] In order to solve the problem of high-temperature flue gas sensible heat waste in the prior art, the present invention provides an integrated system for waste heat utilization and dust removal of flue gas produced in converter steelmaking, which includes: waste heat boiler, steam turbine, Dust collector and gas recovery and release subsystem; the waste heat boiler is used to remove dust from the flue gas produced by the converter steelmaking and generate superheated steam by using the waste heat of the flue gas, and the flue gas side inlet of the waste heat boiler is connected with the converter steelmaking The steam side outlet is connected with the steam inlet of the steam turbine, and the water side inlet is connected with the waste heat boiler feed water source; the dust collector is used to remove dust from the flue gas discharged from the waste heat boiler, and the dust collector The flue gas inlet of the waste heat boiler is connected to the flue gas side outlet of the waste heat boiler, and the gas recovery and release subsystem is connected to the flue gas outlet of the dust collector to recover the flue gas that meets the recovery requirements, and the gas that does not meet the recovery requirements ignition of smoke

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