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Low-cost blast furnace gas desulfurization method and device

A blast furnace gas, low-cost technology, applied in the field of blast furnace gas purification, can solve problems such as difficult removal of organic sulfur, achieve the effects of prolonging service life, reducing operating costs, and improving desulfurization efficiency

Pending Publication Date: 2022-08-05
ANHUI WEIDA ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relatively stable organic sulfur is hydrolyzed into easy-to-remove inorganic sulfur and removed by dry adsorption method, which solves the problem that organic sulfur is difficult to remove. In addition, this method rationally plans the utilization of heat energy while considering gas purification, Energy saving

Method used

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  • Low-cost blast furnace gas desulfurization method and device

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Experimental program
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Effect test

Embodiment 1

[0044] In a steel plant, the gas pressure drawn from the residual pressure and residual heat utilization device is 10-20KPa, the temperature is 40-100℃, and the blast furnace gas flow rate is 250000Nm 3 / h, including H 2 S concentration 20-65mg / Nm 3 , containing COS concentration 50-160mg / Nm 3 , with CS 2 Concentration 0.2-0.5mg / Nm 3 , The cooling water introduced from the bottom of the pretreatment tower (blast furnace gas condensation and impurity removal pretreatment device 1) is in countercurrent contact with the cooling water sprayed at the top, and the gas is cooled to 30-35 ° C. 1) The gas outlet of 1) is introduced into the rotary GGH2 and heated to about 75 °C, and then the temperature is raised to 90 °C through an external heat source (steam is connected to the rotary GGH2 as a heat source, 3t / h steam) and enters the hydrolysis tank. On the surface of the hydrolysis catalyst, the blast furnace Organic sulfur in coal gas is converted into H by catalytic hydrolysis...

Embodiment 2

[0047] In a steel plant, the gas pressure drawn from the residual pressure and residual heat utilization device is 10-20KPa, the temperature is 40-100℃, and the blast furnace gas flow rate is 250000Nm 3 / h, including H 2 S concentration 20-65mg / Nm 3 , containing COS concentration 50-160mg / Nm 3 , with CS 2 Concentration 0.2-0.5mg / Nm 3 , The cooling water introduced from the bottom of the pretreatment tower and the cooling water sprayed at the top are in countercurrent contact, the gas is cooled to 30-35 °C, introduced from the gas outlet of the pretreatment device to the rotary GGH and heated to about 75 °C, and then passes through an external heat source (steam). As a heat source connected to a rotary GGH, 3t / h steam), the temperature is raised to 90 °C and enters the hydrolysis tank. On the surface of the hydrolysis catalyst, the organic sulfur in the blast furnace gas is converted into H by catalytic hydrolysis of the catalyst. 2 S, hydrolysis reaction space velocity 100...

Embodiment 3

[0050] In a steel plant, the gas pressure drawn from the residual pressure and residual heat utilization device is 10-20KPa, the temperature is 40-100℃, and the blast furnace gas flow rate is 250000Nm 3 / h, including H 2 S concentration 20-65mg / Nm 3 , containing COS concentration 50-160mg / Nm 3 , with CS 2 Concentration 0.2-0.5mg / Nm 3 , The cooling water introduced from the bottom of the pretreatment tower and the cooling water sprayed at the top are in countercurrent contact, the gas is cooled to 30-35 °C, introduced from the gas outlet of the pretreatment device to the rotary GGH and heated to about 75 °C, and then passes through an external heat source (steam). As a heat source, it is connected to a rotary GGH, 3t / h steam), and the temperature is raised to 90 °C and enters the hydrolysis tank. On the surface of the hydrolysis catalyst, the organic sulfur in the blast furnace gas is converted into H by the catalytic hydrolysis of the catalyst. 2 S, hydrolysis reaction spa...

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Abstract

The invention relates to a low-cost blast furnace gas desulfurization method, which adopts a rotary flue gas heat exchanger, and comprises the following steps: (1) carrying out condensation pretreatment on blast furnace gas from a residual pressure and residual heat utilization device to cool the gas at 40-100 DEG C to 30-35 DEG C, and simultaneously removing dust, chlorine and mist to protect a hydrolysis catalyst and a desulfurizing agent; (2) raising the temperature of the coal gas to about 75 DEG C through a rotary flue gas heat exchanger, and then raising the temperature to 90 DEG C by using an external heat source; (3) introducing the heated blast furnace gas into an organic sulfur conversion hydrolysis tower to hydrolyze organic sulfur into H2S; and (4) transferring heat of the hydrolyzed blast furnace gas to the front-section low-temperature blast furnace gas through a rotary flue gas heat exchanger, cooling to about 55 DEG C, introducing into a dry adsorption tower, and introducing the purified blast furnace gas to a downstream user side.

Description

technical field [0001] The invention relates to the technical field of blast furnace gas purification, in particular to a low-cost blast furnace gas desulfurization method and a device thereof. Background technique [0002] In modern industry, blast furnace ironmaking technology has always been the mainstream ironmaking method, and its output accounts for more than 95% of the world's total output of pig iron. Blast furnace ironmaking will by-produce a large amount of blast furnace gas. The sulfur in blast furnace gas will not only corrode the gas pipeline, but also generate a large amount of SO if it is directly burned at the downstream user end without purification treatment. 2 , causing pollution to the living environment of human beings and endangering our health. In addition, the sulfur in the gas can poison the catalyst. Therefore, whether the blast furnace gas is directly burned or passed into the downstream process, it needs to be purified and desulfurized. [0003...

Claims

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Application Information

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IPC IPC(8): C10K1/00C10K1/04C10K1/32C10K1/34
CPCC10K1/004C10K1/34C10K1/32C10K1/04Y02P20/129
Inventor 黄乃金石勇王一臻解彬
Owner ANHUI WEIDA ENVIRONMENTAL PROTECTION TECH