阅读说明：本技术 一种高炉煤气一体化干法脱硫的装置及工艺 (Blast furnace gas integrated dry desulphurization device and process ) 是由 朱廷钰 李玉然 林玉婷 许志成 王斌 于 2020-07-03 设计创作，主要内容包括：本发明涉及一种高炉煤气一体化干法脱硫的装置及工艺,所述装置包括依次连接的除尘单元、脱硫单元及TRT发电单元；所述脱硫单元包括一体化脱硫塔。本发明提供的一体化脱硫装置在设置过程中可减少对现有高炉煤气处理工艺及设备的影响,实现高炉煤气中硫的资源化,减少TRT发电的损失,为企业节约运行成本。(The invention relates to a device and a process for integrated dry desulphurization of blast furnace gas, wherein the device comprises a dust removal unit, a desulphurization unit and a TRT power generation unit which are sequentially connected; the desulfurization unit includes an integrated desulfurization tower. The integrated desulfurization device provided by the invention can reduce the influence on the existing blast furnace gas treatment process and equipment in the setting process, realize the resource utilization of the sulfur in the blast furnace gas, reduce the TRT power generation loss and save the operation cost for enterprises.)

1. The integrated dry desulfurization device for blast furnace gas is characterized by comprising a dust removal unit, a desulfurization unit and a TRT power generation unit which are sequentially connected;

the desulfurization unit includes an integrated desulfurization tower.

2. The apparatus according to claim 1, wherein the dust removing unit comprises a gravity dust remover and a bag-type dust remover which are arranged in sequence;

preferably, the TRT power generation unit includes a TRT residual pressure power generation device.

3. The apparatus according to claim 1 or 2, wherein a moving bed is provided in the integrated desulfurization tower;

preferably, the height-diameter ratio of the integrated desulfurization tower is 3-7;

preferably, the air inlet of the integrated desulfurization tower is positioned at the top;

preferably, the gas outlet of the integrated desulfurization tower is positioned at the bottom;

preferably, the desulfurization unit further comprises a regeneration column;

preferably, the desulfurizer outlet of the integrated desulfurization tower is connected with the desulfurizer of the regeneration tower;

preferably, the regenerated desulfurizer outlet of the regeneration tower is connected with the desulfurizer of the integrated desulfurization tower.

4. The integrated dry desulfurization process for blast furnace gas is characterized by comprising the following steps of: the blast furnace gas is sequentially subjected to dust removal and desulfurization to obtain desulfurized gas;

wherein the desulfurized coal gas is reused after TRT power generation.

5. The process of claim 4, wherein said dust removal comprises gravity dust removal and bag dust removal in sequence.

6. The process as claimed in claim 4 or 5, wherein the dust content of the dedusted coal gas is less than 5mg/m³；

Preferably, the temperature of the coal gas after dust removal is 120-140 ℃.

7. The process of any one of claims 4 to 6, wherein the desulphurizing agent comprises molecular sieves, activated carbon, ZnO, Fe₂O₃Or a combination of 1 or at least 2 of the hydrotalcite-like compounds;

preferably, the height-diameter ratio of the integrated desulfurization tower in the desulfurization is 3-7;

preferably, the moving speed of the desulfurizing agent in the desulfurization is 0.015-0.03 m/h.

8. The process according to any one of claims 4 to 7, wherein the temperature of the desulfurization is 80 to 150 ℃;

preferably, the pressure of the desulfurization is 120-250 kPa;

preferably, the total sulfur content in the desulfurized coal gas is less than 20mg/m³；

Preferably, the temperature of the desulfurized coal gas after TRT power generation treatment is 45-55 ℃.

9. The process according to claim 7 or 8, characterized in that the desulfurizing agent in desulfurization is regenerated;

preferably, the temperature of the regeneration is 250-600 ℃;

preferably, the regeneration is carried out under a protective atmosphere;

preferably, the protective atmosphere comprises nitrogen and/or an inert gas.

10. The process according to any one of claims 4 to 9, wherein the process comprises: the blast furnace gas is sequentially subjected to dust removal and desulfurization to obtain desulfurized gas;

wherein the desulfurized coal gas is reused after TRT power generation; the dust removal comprises gravity dust removal and cloth bag dust removal which are sequentially carried out; the dust content of the dedusted coal gas is less than 5mg/m³(ii) a The temperature of the dedusted coal gas is 120-140 ℃; the desulfurizing agent for desulfurization comprises molecular sieve, active carbon, ZnO and Fe₂O₃Or a combination of 1 or at least 2 of the hydrotalcite-like compounds; the height-diameter ratio of the integrated desulfurization tower in desulfurization is 3-7; the moving speed of the desulfurizer in the desulfurization is 0.015-0.03 m/h; the temperature of the desulfurization is 80-150 ℃; the pressure of the desulfurization is 120-250 kPa; the total sulfur content in the desulfurized coal gas is less than 20mg/m³(ii) a The temperature of the desulfurized coal gas after TRT power generation treatment is 45-55 ℃; regenerating a desulfurizing agent in the desulfurization; the regeneration temperature is 250-600 ℃; the regeneration is carried out under a protective atmosphere; the protective atmosphere comprises nitrogen and/or an inert gas.

Technical Field

The invention relates to the field of gas desulfurization, in particular to a device and a process for integrated dry desulfurization of blast furnace gas.

Background

The opinion on the promotion of ultra-low emissions in the iron and steel industry issued by the ministry of environmental protection requires the tail gas SO of a blast furnace hot blast stove₂＜50mg/m³If not passing through a desulfurization facility, SO₂Exceed the standard by 5-8 times. The fuel source of the blast furnace hot blast stove is blast furnace gas, if SO is carried out at the tail gas of the hot blast stove₂The removal of (2) is not economical due to a large number of desulfurization sites. The focus of current research is therefore on organic sulfur and H in blast furnace gas₂And (4) removing S. The total sulfur content of the blast furnace gas is 200-300mg/m³More than 70% of the total content is COS and 25% is H₂S, 5% is other organosulfur forms. If wet desulphurization is adopted, a dehydration device is additionally added, because the water content in the gas can influence the calorific value of the blast furnace gas. The dry desulfurization device can improve the desulfurization efficiency, has little influence on the prior blast furnace and hot blast stove process, and is a blast furnace gas desulfurization process with wide prospect.

CN110129102A discloses a desulfurization process for blast furnace gas, which mainly comprises two identical adsorption towers filled with molecular sieve resin, wherein the cooled blast furnace gas is introduced into an adsorption tower A for adsorption, and when the sulfur content of the gas at the outlet of the adsorption tower A is 5mg/m³When the gas is exhausted, the gas is discharged and heated, and then is discharged into the adsorption tower A for high-temperature desorption regeneration, the gas discharged by the high-temperature desorption regeneration passes through the recovery process of the sulfur-containing compounds, the regenerated adsorption tower A is cooled for standby, the regenerated adsorption tower A can be alternately used with the adsorption tower B, and the continuous removal of the sulfur-containing compounds in the blast furnace gas is realized. The catalyst needs high-temperature desorption and regeneration, and the energy consumption of the system is high.

CN110643395A discloses a process system utilizing wet desulphurization. However, the process adopts wet desulphurization, has large volume and produces waste water.

Therefore, in order to solve the above problems, it is necessary to develop a new blast furnace gas desulfurization process flow which can reduce the influence on the existing process and improve the desulfurization efficiency.

Disclosure of Invention

In view of the problems in the prior art, the invention aims to provide a device and a process for integrated dry desulphurization of blast furnace gas, and the integrated dry desulphurization device provided by the invention can reduce the influence on the existing configuration in the configuration process, ensure the maximization of economic benefit, and simultaneously improve the desulphurization effect, wherein the desulphurization rate is as high as more than 90%.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a blast furnace gas integrated dry desulphurization device, which comprises a dust removal unit, a desulphurization unit and a TRT power generation unit which are connected in sequence;

the desulfurization unit includes an integrated desulfurization tower.

The integrated desulfurization device provided by the invention can reduce the influence on the existing blast furnace gas treatment process and equipment in the setting process, realize the resource removal of the sulfur in the blast furnace gas, reduce the TRT power generation loss and save the operation cost for enterprises.

As a preferable technical scheme of the invention, the dust removal unit comprises a gravity dust remover and a bag-type dust remover which are sequentially arranged.

Preferably, the TRT power generation unit includes a TRT residual pressure power generation device.

As a preferable technical scheme of the invention, a moving bed is arranged in the integrated desulfurization tower.

Preferably, the ratio of height to diameter of the integrated desulfurization tower is 3 to 7, and may be, for example, 3, 4, 5, 6, or 7, but is not limited to the recited values, and other values not recited in this range are also applicable.

Preferably, the gas inlet of the integrated desulfurization tower is located at the top.

Preferably, the gas outlet of the integrated desulfurization tower is positioned at the bottom.

Preferably, the desulfurization unit further comprises a regeneration column.

Preferably, the desulfurizer outlet of the integrated desulfurization tower is connected with the desulfurizer of the regeneration tower.

Preferably, the regenerated desulfurizer outlet of the regeneration tower is connected with the desulfurizer of the integrated desulfurization tower.

According to the invention, the dry-method integrated desulfurization tower can simultaneously remove HCl and HCN in blast furnace gas, and the corrosion of blades of the TRT (blast furnace gas recovery turbine) residual pressure power generation device is slowed down.

In a second aspect, a blast furnace gas integrated dry desulfurization process comprises: the blast furnace gas is sequentially subjected to dust removal and desulfurization to obtain desulfurized gas;

the invention develops a dry desulfurization process and a dry desulfurization device for blast furnace gas aiming at the characteristics of large gas flow, high pressure and complex water content of the blast furnace gas, and the dry desulfurization process and the dry desulfurization device can simultaneously remove COS and H in the gas₂S, HCl and water vapor are removed cooperatively, so that the corrosion condition of blades in a TRT unit is greatly reduced, and the influence caused by the process is reduced.

Wherein the desulfurized coal gas is reused after TRT power generation.

As the preferable technical scheme of the invention, the dust removal comprises gravity dust removal and cloth bag dust removal which are sequentially carried out.

As the preferable technical scheme of the invention, the dust content of the dedusted coal gas is less than 5mg/m³For example, it may be 4.5mg/m³、4mg/m³、3.5mg/m³、3mg/m³、2.5mg/m³、2mg/m³、1.5mg/m³Or 1mg/m³And the like, but are not limited to the recited values, and other values not recited within the range are equally applicable.

Preferably, the temperature of the gas after dust removal is 120-140 ℃, such as 120 ℃, 125 ℃, 130 ℃, 135 ℃ or 140 ℃, but not limited to the recited values, and other values not recited in the range are also applicable.

As a preferred technical scheme of the invention, the desulfurizing agent for desulfurization comprises molecular sieve, active carbon, ZnO and Fe₂O₃Or a combination of 1 or at least 2 of the hydrotalcite-like compounds.

The combination can be a combination of molecular sieve and activated carbon, ZnO and Fe₂O₃The combinations of (3) and (3) or the combination of hydrotalcite and molecular sieve, but not limited to the combinations listed, and other combinations not listed in the scope are also applicable.

Preferably, the ratio of height to diameter of the desulfurization tower integrated in the desulfurization is 3 to 7, and may be, for example, 3, 4, 5, 6 or 7, but is not limited to the values listed, and other values not listed in the range are also applicable.

Preferably, the desulfurizing agent in the desulfurization moves at a speed of 0.015 to 0.03m/h, and may be, for example, 0.015m/h, 0.016m/h, 0.017m/h, 0.018m/h, 0.019m/h, 0.02m/h, 0.022m/h, 0.024m/h, 0.026m/h, 0.028m/h, or 0.03m/h, etc., but is not limited to the enumerated values, and other unrecited values in this range are also applicable.

In a preferred embodiment of the present invention, the temperature of the desulfurization is 80 to 150 ℃, and may be, for example, 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃ or 150 ℃, but not limited to the above-mentioned values, and other values not listed in the above range are also applicable.

Preferably, the pressure for desulfurization is 120kPa to 250kPa, and may be, for example, 120kPa, 130kPa, 140kPa, 150kPa, 160kPa, 170kPa, 180kPa, 190kPa, 200kPa, 210kPa, 220kPa, 230kPa, 240kPa, 250kPa, or the like, but is not limited to the recited values, and other values not recited in the range are also applicable.

Preferably, the total sulfur content in the desulfurized coal gas is less than 20mg/m³For example, it may be 18mg/m³、16mg/m³、14mg/m³、12mg/m³、10mg/m³、8mg/m³、6mg/m³Or 4mg/m³And the like, but are not limited to the recited values, and other values not recited within the range are equally applicable.

Preferably, the temperature of the desulfurized gas after TRT power generation treatment is 45 to 55 ℃, for example, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃, 51 ℃, 52 ℃, 53 ℃, 54 ℃ or 55 ℃, but not limited to the recited values, and other values not recited in the range are also applicable.

As a preferable technical scheme of the invention, the desulfurizing agent in the desulfurization is regenerated.

Preferably, the regeneration temperature is 250-600 ℃, for example, 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃, 550 ℃ or 600 ℃, but not limited to the enumerated values, and other unrecited values in the range are also applicable.

Preferably, the regeneration is carried out under a protective atmosphere.

Preferably, the protective atmosphere comprises nitrogen and/or an inert gas.

As a preferable technical scheme of the invention, the process comprises the following steps: the blast furnace gas is sequentially subjected to dust removal and desulfurization to obtain desulfurized gas;

wherein the desulfurized coal gas is reused after TRT power generation; the dust removal comprises gravity dust removal and cloth bag dust removal which are sequentially carried out; the dust content of the dedusted coal gas is less than 5mg/m³(ii) a The temperature of the dedusted coal gas is 120-140 ℃; the desulfurizing agent for desulfurization comprises molecular sieve, active carbon, ZnO and Fe₂O₃Or a combination of 1 or at least 2 of the hydrotalcite-like compounds; the height-diameter ratio of the integrated desulfurization tower in desulfurization is 3-7; the moving speed of the desulfurizer in the desulfurization is 0.015-0.03 m/h; the temperature of the desulfurization is 80-150 ℃; the pressure of the desulfurization is 120-250 kPa; the total sulfur content in the desulfurized coal gas is less than 20mg/m³(ii) a The temperature of the desulfurized coal gas after TRT power generation treatment is 45-55 ℃; regenerating a desulfurizing agent in the desulfurization; the regeneration temperature is 250-600 ℃; the regeneration is carried out under a protective atmosphere; the protective atmosphere comprises nitrogen and/or an inert gas.

In the invention, the regeneration tower adopts a thermal regeneration mode, and realizes the recycling of the desulfurizer by heating up and desorbing the sulfur-containing substances. The desulfurizer after adsorption saturation enters a regeneration tower from the upper end of the regeneration tower through a vibrating screen, the temperature in the tower rises to 250-plus-600 ℃, the regeneration tower is divided into a regeneration section and a cooling section, the regeneration section completes the regeneration of the desulfurizer, the desorbed sulfur-containing gas enters a subsequent processing unit from the regeneration section, and the desulfurizer enters the cooling section from the regeneration section and is cooled to about 150 ℃ and then enters the dry-process integrated desulfurization tower for recycling. The temperature of the upper half part is from 150 to 250-. The dry-method integrated desulfurization tower and the regeneration tower are both provided with storage bins.

The invention develops a blast furnace gas desulfurization process and a device aiming at the characteristics of large gas flow, high pressure and complex components of blast furnace gas, and can simultaneously remove COS and H in the gas₂And S, simultaneously removing HCl in a synergistic manner, thereby greatly reducing the corrosion condition of blades in the TRT unit. The height-diameter ratio is an important factor influencing the desulfurization efficiency and the pressure drop of the reaction tower, the reasonable range of the height-diameter ratio is 3-7, if the height-diameter ratio is too high, the pressure drop of the reaction tower is too large, the TRT residual pressure power generation efficiency is reduced, the power generation economy is influenced, and if the height-diameter ratio is too low, the contact time of coal gas and a catalyst is insufficient, and the desulfurization efficiency is reduced. Meanwhile, if the moving speed of the desulfurizer is too low, the desulfurization efficiency can be reduced due to the fact that the desulfurizer is not in time in a circulating mode and is saturated in adsorption, and if the moving speed is too high, due to the fact that the desulfurizer is abraded in the moving process, some dust can be brought out by desulfurization, and the pressure drop can be increased due to too high moving speed, so that the TRT power generation efficiency is affected. Therefore, the invention realizes high-efficiency desulfurization and power generation through the specific coupling of the height-diameter ratio, the moving speed of the desulfurizing agent and the process sequence.

Compared with the prior art, the invention has the following beneficial effects:

(1) the integrated desulfurization device provided by the invention can reduce the influence on the existing blast furnace gas treatment process and equipment in the setting process, realize the resource utilization of the sulfur in the blast furnace gas, reduce the TRT power generation loss and save the operation cost for enterprises.

(2) The invention develops a blast furnace gas desulfurization process and a device aiming at the characteristics of large gas flow, high pressure and complex components of blast furnace gas, and can simultaneously remove COS and H in the gas₂And S, simultaneously removing HCl in a synergistic manner, thereby greatly reducing the corrosion condition of blades in the TRT unit.

Drawings

Fig. 1 is a schematic diagram of a device for integrated dry desulfurization of blast furnace gas provided in example 1 of the present invention.

In the figure: the method comprises the following steps of 1-gravity dust collector, 2-bag dust collector, 3-integrated desulfurizing tower, 4-TRT power generation unit and 5-regeneration tower, wherein the solid arrow is the flow direction of coal gas, and the dotted arrow is the flow direction of desulfurizing agent.

The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.

Detailed Description

To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows: