Wet desulphurization process and device for sintering machine flue gas

A technology of wet desulfurization and sintering machine, applied in the direction of combination device, separation method, air quality improvement, etc., can solve the problems of large environmental pollution, increase the resistance of flue gas of desulfurization system, and form smoke and rain, and save investment and operation cost, Improve the effect of governance and increase the effect of lifting height

Active Publication Date: 2014-03-12
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The application number is 200810038050.3. The Chinese invention patent discloses a direct discharge flue gas countercurrent purification treatment method. A direct discharge chimney is installed on the top of the absorption tower to directly discharge the tail gas into the atmosphere to avoid corrosion of the flue and equipment by the acid tail gas, but there is no Exhaust gas treatment and dedusting and fog removal are carried out. The temperature of the flue gas at the outlet is low. After the pollutants are discharged from the outlet of the straight chimney, it will form smoke and rain. The pollutants will diffuse and enrich in the nearby area, which is easy to corrode the nearby soil and farms, causing great environmental pollution.
At the same time, the temperature of the flue gas will decrease in the straight chimney section, which increases the flue gas resistance of the desulfurization system, and requires equipment to provide more pressure for the flue gas to overcome the flue gas resistance, which increases the operating cost of the desulfurization system, and is not suitable for sintering Comprehensive treatment of machine flue gas

Method used

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  • Wet desulphurization process and device for sintering machine flue gas

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Embodiment 1

[0033] A steel group 1×160m 2 Sintering machine flue gas and blast furnace gas account for 37% of the total flue gas volume. With the device and process of the present invention, the desulfurizer is limestone. The liquid-gas ratio of wet desulfurization is 8L / m 3 , the pH is controlled at 5.3, the gas velocity in the direct chimney is 17.8m / s, the pressure at the top of the absorption tower is controlled at -100-50Pa, and the inlet flue gas SO 2 The concentration is 2780mg / m 3 , CO concentration is 11300ppm. The desulfurization efficiency is 96.3%, the flue gas temperature at the outlet of the straight chimney is 87°C, and the dust content at the outlet is 28mg / m 3 , the outlet CO concentration is 172ppm, and there is no smoke and rain at the outlet.

Embodiment 2

[0035] A steel group 2×240m 2 Sintering machine flue gas and blast furnace gas account for 33% of the total flue gas volume. With the device and process of the present invention, the desulfurizer is lime. The liquid-gas ratio of wet desulfurization is 10L / m 3 , the pH is controlled at 5.2, the gas velocity in the direct chimney is 15.6m / s, the pressure at the top of the absorption tower is controlled at -120-80Pa, and the inlet flue gas SO 2 The concentration is 2220mg / m 3 , CO concentration is 9800ppm. The desulfurization efficiency is 97.9%, the flue gas temperature at the outlet of the straight chimney is 85°C, and the dust content at the outlet is 31mg / m 3 , the CO concentration at the outlet is 145ppm, and there is no smoke and rain at the outlet.

Embodiment 3

[0037] A steel group 1×180m 2 Sintering machine flue gas and blast furnace gas account for 35% of the total flue gas volume. With the device and process of the present invention, the desulfurizer is limestone. The liquid-gas ratio of wet desulfurization is 7L / m 3 , the pH is controlled at 5.4, the gas velocity in the direct chimney is 16.9m / s, the pressure at the top of the absorption tower is controlled at -110-70Pa, and the inlet SO 2 The concentration is 3260mg / m 3 , CO concentration is 10300ppm. The desulfurization efficiency is 96.1%, the flue gas temperature at the outlet of the straight chimney is 88°C, and the dust content at the outlet is 26mg / m 3 , the outlet CO concentration is 121ppm, and there is no smoke and rain at the outlet.

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Abstract

The invention discloses a wet desulphurization process and a device for sintering machine flue gas, which belong to the field of air pollution control. The device comprises an absorption tower, wherein a first demister, a spraying layer and a pulp chest are sequentially arranged in the absorption tower from top to bottom. A direct-discharging chimney is arranged at the top of the absorption tower, a gas pipeline is arranged at the upper portion in the direct-discharging chimney, a second demister is arranged in the middle in the direct-discharging chimney, and a baffle door is arranged at the lower portion in the direct-discharging chimney. The process is that the device is utilized to carry out wet desulphurization on the sintering machine flue gas which is mixed with blast-furnace gas for combustion after the sintering machine flue gas is demisted. The device and the process are used for overall treatment on the sintering machine flue gas and the blast-furnace gas, can effectively remove harmful gas including carbonic oxide, dioxin and the like in the flue gas in a desulphurization mode, improve the temperature of the flue gas at a wet desulphurization outlet and achieve purification treatment on the blast-furnace gas simultaneously.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a process and device for wet desulfurization of flue gas from a sintering machine. Background technique [0002] The polluting gases produced in the steel production process are mainly sintering machine flue gas, blast furnace gas and coke oven gas. During the sintering process, the iron ore, calcium oxide, fluorite and other ground powder are mixed evenly and then transported to the sintering machine to be calcined to form coarse iron, and the sintering machine flue gas is generated during the sintering process. The flue gas emissions from sintering account for more than 60% of the total emissions from steel production, and are the main source of SO2 in the steel production process. [0003] Sintering machine flue gas has the characteristics of low flue gas temperature, high dust content, high moisture content, and wide fluctuation range of flue gas. Each ton of sintered or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/60B01D53/68B01D53/48B01D53/62B01D53/72B01D50/00
CPCY02A50/20
Inventor 李泽清夏纯洁莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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