Full dry purification and residual heat utilization equipment and method for converter gas

Abstract

The invention provides devices for purifying converter gas by dry process and using afterheat of the converter gas and a method thereof. In a converting period, waste gas exhausted from the converter is cooled by a movable gas hood and a vaporizing cooling duct, then is sent into a gravity dust collector to reduce dust content thereof, is conducted into a flue and then to an afterburning afterheat boiler; the afterburning afterheat boiler generates overheated vapor by using large quantity of sensible heat of the converter gas and sends the converter gas after being cooled into a bag dust collector through the flue to purify; the purified converter gas is sent to a draft fan to be pressurized through the flue, then passes through a three-way valve, and is sent to a converter gas cabinet; in a non-blowing period of the converter, converter gas is not generated; afterburning afterheat boiler burns a certain amount of blast furnace gas to stabilize load thereof and vapor yield. The three-way valve is switched to cause the afterheat boiler waster gas exhausted from the draft fan to flow to a waste gas discharging chimney. The converter gas processed by the method and devices has very low dust and moisture contents and is an ideal purified gas. During the operation process, large quantity of industrial water is saved, and large quantity of secondary energy is recycled.

Description

technical field [0001] The invention relates to the field of converter gas purification, in particular to a converter gas full-dry purification and waste heat utilization equipment and method. technical background [0002] The converter blowing period is generally 12 to 18 minutes, and the smelting cycle is 28 to 38 minutes. During the blowing period, the converter produces raw coal gas with extremely high dust content at around 1600 ° C, and the gas volume is large, containing a large amount of sensible heat that can be used. So far, the vaporization cooling flue is generally used to cool the high-temperature raw coal gas to about 900°C, and then the purification method is to use a water spray cooling device or an atomization cooling device and an electrostatic precipitator. The resulting converter gas has a large water content, and it is difficult to control the water content. When the specific resistance changes, it will affect the dust removal effect of the electrostati...

AI Technical Summary

Problems solved by technology

The resulting converter gas has a large water content, and it is difficult to control the water content. When the specific resistance changes, it will affect the dust removal effect of the electrostatic precipitator, and the final dust content of the converter gas will seriously exceed the standard (it cannot reach 10mg at all. / Nm 3 )

Under such working conditions, the electrostatic precipitator still has the danger of timely blasting (explosion)

Moreover, the converter gas at around 900°C contains a large amount of available sensible heat, all of which are taken away by the sprayed cooling water, which wastes a large amount of secondary energy and consumes a large amount of valuable industrial water.

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