CN210367569U - Blast furnace gas dry desulphurization system - Google Patents

Blast furnace gas dry desulphurization system Download PDF

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CN210367569U
CN210367569U CN201921291923.1U CN201921291923U CN210367569U CN 210367569 U CN210367569 U CN 210367569U CN 201921291923 U CN201921291923 U CN 201921291923U CN 210367569 U CN210367569 U CN 210367569U
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desulfurization
powder
blast furnace
dry
furnace gas
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贾彩清
谢建
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CISDI Technology Research Center Co Ltd
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CISDI Technology Research Center Co Ltd
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Abstract

The utility model discloses a blast furnace gas dry desulfurization system, include the leading powder desulphurization unit that connects gradually along the desulfurization route, the fine dust remover of dry process, organic sulfur conversion tower and second grade dry desulfurization device constitute the second grade desulfurization unit, still include sulphur content detection device and coal gas bypass, the coal gas bypass is parallelly connected with second grade desulfurization unit, is provided with the governing valve group on this coal gas bypass, and the export of coal gas bypass and the export of second grade desulfurization unit are joined. The utility model discloses, the desulfurization divide into leading desulfurization and second grade desulfurization two-stage and arranges, and the second grade desulfurization is parallelly connected to have the bypass, can adapt to blast furnace gas and contain the variable operating mode operation and the system security that the change was become, further reduces the running cost.

Description

Blast furnace gas dry desulphurization system
Technical Field
The utility model belongs to the technical field of blast furnace gas desulfurization, concretely relates to blast furnace gas dry desulfurization system.
Background
The blast furnace will produce a large amount of blast furnace gas in the smelting process, about 1400m per 1 ton of iron smelted3~1800m3The blast furnace gas of (1). Blast furnace gas is used as a secondary energy source in the iron-making process and has the most extensive application in iron and steel enterprises. The sulphide contained in the blast furnace gas being other than H2S (hydrogen sulfide) and SO2(Sulfur dioxide) in addition to inorganic sulfur, a large amount of sulfur (COS) and CS2(carbon disulfide) is the predominant organic sulfur. After burning, SO in the flue gas2The content can reach 40mg/m3~250mg/m3. Can not reach 50mg/m recommended by national ultra-low emission3(hot-blast stove, heating furnace, and baking) and 35mg/m3(boiler and gas turbine). The current blast furnace gas desulfurization process route is as follows: blast furnace gas dust removal system → organic sulfur conversion → residual pressure power generation → normal temperature wet oxidation absorption process desulfurization → pipe network. The process has the following disadvantages:
1) the corrosion or salt accumulation of the residual pressure power generation facilities and the pipeline is aggravated.
Organic sulfur hydrolytic conversion is arranged before the residual pressure power generation, wet desulphurization is arranged after the residual pressure power generation, and H in coal gas is hydrolyzed and converted2The S content will increase, which will aggravate corrosion or salt accumulation of the residual pressure power generation facility and its subsidiary pipes.
2) The system is complex, the occupied area is large, the energy consumption is high, and the operation cost is high.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings in the prior art, an object of the present invention is to provide a blast furnace gas dry desulfurization system, which can flexibly adapt to the variable operation condition operation of the sulfur-containing change of the blast furnace gas, and reduce the cost.
In order to achieve the above objects and other related objects, the technical solution of the present invention is as follows:
a blast furnace gas dry desulphurization system is used for desulphurization of blast furnace gas after dust removal, and comprises a preposed powder desulphurization device, a dry fine dust remover, an organic sulfur conversion tower and a second-stage dry desulphurization device which are sequentially connected along a desulphurization route, wherein the organic sulfur conversion tower and the second-stage dry desulphurization device form a second-stage desulphurization unit, and further comprises a sulfur content detection device and a gas bypass, the sulfur content detection device is used for detecting the sulfur content of the gas before entering the preposed powder desulphurization device, the gas bypass is connected with the second-stage desulphurization unit in parallel, an adjusting valve group is arranged on the gas bypass, and the outlet of the gas bypass and the outlet of the second-stage desulphurization unit are converged.
By adopting the structure, the desulfurization is divided into two-stage arrangement of pre-desulfurization and secondary desulfurization, and the secondary desulfurization is connected with the bypass in parallel, so that whether the pre-powder desulfurization device is used or not, whether the secondary desulfurization unit is used or not and the coal gas amount entering the coal gas bypass and the secondary desulfurization unit can be reasonably distributed according to the content of the blast furnace gas; can adapt to the variable working condition operation of the sulfur-containing change of blast furnace gas and the system safety, and further reduces the operation cost. And the powder desulphurization device is small in occupied area, simple in system and flexible in arrangement, is particularly suitable for desulphurization of the existing blast furnace gas system in a blast furnace area with short occupied area, has small resistance loss of gas desulphurization pressure, is beneficial to subsequent excess pressure power generation recovery, and has strong system adaptability.
Optionally, the regulating valve group comprises a flow regulating valve and/or a pressure regulating valve.
Optionally, the blast furnace gas dry desulphurization system further comprises a powder storage tank, and the powder storage tank provides desulphurization powder for the front powder desulphurization device.
Optionally, the second-stage dry desulfurization device is a second-stage powder desulfurization device, and the powder storage tank further provides desulfurization powder for the second-stage powder desulfurization device.
Optionally, a powder catcher for separating desulfurized coal gas from desulfurized powder and collecting desulfurized powder is connected behind the second-stage powder desulfurizing device.
Optionally, the powder storage tank takes nitrogen or blast furnace gas as carrier gas, and the desulfurized powder is sent to the front powder desulfurization device or the second-stage powder desulfurization device.
Optionally, the desulfurization powder is activated carbon powder, alkaline desulfurization powder or a mixture of the two.
Optionally, the second-stage dry desulfurization device is a hydrogen sulfide dry adsorption tower.
Optionally, a control valve is arranged on a connecting pipeline between the organic sulfur conversion tower and the dry fine dust collector to select whether to introduce the coal gas into the organic sulfur conversion tower.
Optionally, blast furnace gas dry desulfurization system still includes blast furnace, dry process coarse dust remover and excess pressure power generation facility, the air inlet of dry process coarse dust remover is connected to the blast furnace export, the gas outlet of dry process coarse dust remover passes through the pipeline and is connected with leading powder desulphurization unit, the low reaches after coal gas bypass and second grade desulfurization unit converge are connected to excess pressure power generation facility.
Optionally, the blast furnace gas dry desulphurization system further comprises a buffer tank, and the buffer tank is connected to the downstream of the gas bypass after the gas bypass and the secondary desulphurization unit are merged.
Optionally, a venturi reactor is arranged on a pipeline from the front powder desulfurization device to the dry fine dust collector.
The utility model has the advantages that: the desulfurization is divided into two-stage arrangement of pre-desulfurization and secondary desulfurization, and the secondary desulfurization is connected with a bypass in parallel, so that whether a pre-powder desulfurization device is used or not and whether a secondary desulfurization unit is used or not can be selected according to the sulfur content and the sulfur-containing type of the blast furnace gas, and the gas amount entering the gas bypass and the secondary desulfurization unit can be reasonably distributed; can adapt to the variable working condition operation of the sulfur-containing change of blast furnace gas and the system safety, and further reduces the operation cost. And the powder desulfurizing device has the advantages of small occupied area, simple system, small gas pressure loss and flexible arrangement, is particularly suitable for desulfurizing the gas of the existing blast furnace system in a blast furnace area with short occupied area, and has strong system adaptability.
Drawings
FIG. 1 is a schematic view of a dry desulfurization system for blast furnace gas according to an embodiment of the present invention;
FIG. 2 is a schematic view of a dry desulfurization system for blast furnace gas according to another embodiment of the present invention;
description of reference numerals
1 blast furnace
2 Dry method coarse dust remover
3 sulphur content detection device
4 powder storage tank
5 preposed powder desulfurizing device
6 dry method fine dust remover
7 organic sulfur conversion tower
8 second-stage dry desulfurization device
9 gas bypass
10 powder catcher
11 residual pressure generating device
12 control valve
13 regulating valve group
14 buffer tank
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description, and are not intended to limit the scope of the invention, but rather the scope of the invention.
The embodiment is an example of a blast furnace gas dry desulphurization system, as shown in fig. 1, the blast furnace gas dry desulphurization system comprises a preposed powder desulphurization device 5, a dry fine dust remover 6, an organic sulfur conversion tower 7 and a second-stage dry desulphurization device 8 which are sequentially connected along a desulphurization route, and also comprises a sulfur content detection device 3 and a gas bypass 9, wherein a gas outlet of the blast furnace 1 is connected with a dry coarse dust remover 2, and the preposed powder desulphurization device 5 is connected behind the dry coarse dust remover 2; the sulfur content detection device 3 is used for detecting the sulfur content of the coal gas before entering the front powder desulfurization device 5, so as to detect the contents of hydrogen sulfide and organic sulfur in the blast furnace gas, the sulfur content detection device 3 can be used for on-line detection or off-line detection, and the sulfur content detection device 3 can be used for detecting the sulfur content and the types of sulfur-containing substances in the coal gas by adopting a gas chromatograph and the like.
The organic sulfur conversion tower 7 and the second-stage dry desulfurization device 8 form a second-stage desulfurization unit, and the coal gas bypass 9 is connected with the second-stage desulfurization unit in parallel; namely, the rear part of the front powder desulphurization device 5 is divided into two parallel branches, wherein one branch is a coal gas bypass 9, and the other branch is an organic sulfur conversion tower 7 and a second-stage dry desulphurization device 8 which are connected in series; the outlet of the coal gas bypass 9 is converged with the outlet of the secondary desulfurization unit, and the converged coal gas is connected to a pipe network and is sent to a user for use; the gas bypass 9 is provided with a regulating valve group 13 for regulating pressure and/or flow.
The desulfurization is divided into two-stage arrangement of pre-desulfurization and secondary desulfurization, and the secondary desulfurization is connected with a bypass in parallel, so that whether the pre-powder desulfurization device 5 is used or not, whether the secondary desulfurization unit is used or not and the coal gas amount entering the coal gas bypass 9 and the secondary desulfurization unit can be reasonably distributed according to the sulfur-containing type and content of the blast furnace gas; can adapt to the variable working condition operation of the sulfur-containing change of blast furnace gas and the system safety, and further reduces the operation cost. And the powder desulphurization device has the advantages of small occupied area, simple system and flexible arrangement, is particularly suitable for the desulphurization of the existing blast furnace gas system in the blast furnace area with short occupied area, and has strong system adaptability.
The regulating valve group 13 includes a flow regulating valve and/or a pressure regulating valve, such as a pressure reducing valve.
The dry fine dust collector 6 can be a bag type dust collector or a dry electrostatic dust collector, and the dry coarse dust collector 2 can be a cyclone dust collector, a gravity dust collector, a bag type dust collector or a dry electrostatic dust collector; the second-stage dry desulfurization device 8 can adopt a powder desulfurization device (which is a second-stage powder desulfurization device relative to the front powder desulfurization device 5); the powder desulfurizing device can adopt powder spraying spray guns which are controlled in groups and use nitrogen or blast furnace clean gas as a power gas source, spray guns with different groups are selected according to the desulfurizing load, and the desulfurizing powder is sprayed into a blast furnace gas pipeline between the dry rough dust collector 2 and the dry fine dust collector 6. In order to enhance the mixing and reaction effects of the powder and the coal gas, a Venturi reactor can be arranged at the downstream of the injection point of the coal gas pipeline.
When the second-stage dry desulfurization device 8 is a powder desulfurization device, a powder catcher 10 is connected behind the second-stage powder desulfurization device and used for separating desulfurized coal gas from desulfurized powder and collecting desulfurized powder; the powder catcher 10 can adopt a bag type dust collector and the like; the gas outlet of the powder catcher 10 is converged with the outlet of the coal gas bypass 9.
In another embodiment, the second stage dry desulfurization unit 8 is a hydrogen sulfide dry adsorption tower, as shown in FIG. 2. Wherein, active carbon particles and/or alkaline adsorbent particles are arranged in the hydrogen sulfide dry-method adsorption tower; the basic adsorbent particles are metal oxide particles such as iron oxide, zinc oxide, calcium oxide, or the like, or modified activated carbon particles.
The dry fine dust collector 6, the dry coarse dust collector 2, the hydrogen sulfide dry adsorption tower, the powder desulfurization device and the like belong to common equipment in the field and are not described in detail.
In this example, the blast furnace gas dry desulphurization system further comprises a powder storage tank 4 for storing desulphurization powder, and the powder storage tank 4 provides desulphurization powder for the preposed powder desulphurization device 5 and the second-stage powder desulphurization device.
The powder storage tank 4 takes nitrogen in a pipe network or blast furnace clean gas after pressurization as a power gas source (carrier gas), and the desulfurized powder is conveyed to the front powder desulfurizing device 5 or the second-stage powder desulfurizing device in a pneumatic conveying mode. In order to ensure the powder spraying effect, besides the on-way resistance loss of powder conveying, the carrier gas pressure at the spraying point is also higher than the gas pressure to be desulfurized, and the pressure difference is 0.1-0.2 MPa. The preposed powder desulfurizing device 5 or the second-stage powder desulfurizing device is provided with one group or a plurality of groups of powder spraying mechanisms (such as powder spraying guns), so that the number of the powder spraying guns which are put into operation can be selected according to the required powder spraying amount. Thereby flexibly determining the number of groups of powder spraying guns which are put into operation according to the sulfur content of the coal gas.
Specifically, the desulfurization powder is activated carbon powder, alkaline desulfurization powder, or a mixture of activated carbon powder and alkaline desulfurization powder, and is used for adsorbing and removing part of H2S and organic sulfur. The alkaline desulfurization powder material can be impregnated or loaded with alkaliModified activated carbon powder, metal oxide (such as ferric oxide, zinc oxide, calcium oxide, etc.), NaOH, Ca (OH)2、Na2CO3Or NaHCO3. The mixing ratio of the activated carbon powder and the alkaline desulfurization powder is selected according to the components of the coal gas, and can be any ratio, for example, when the content of hydrogen sulfide and sulfur in the coal gas accounts for 70% of the total sulfur (the content of hydrogen sulfide and sulfur in the coal gas is divided by 34 × 32), the content of organic sulfur accounts for 30% of the total sulfur (the content of organic sulfur, the content of sulfur is calculated according to the specific molecular weight of organic sulfur), and the ratio of the alkaline powder to the activated carbon powder is 7: 3.
In order to conveniently turn off the secondary desulfurization unit, a control valve 12 is arranged on a connecting pipeline between the organic sulfur conversion tower 7 and the dry fine dust collector 6 to control the on-off and select whether to introduce coal gas into the organic sulfur conversion tower.
In one embodiment, the blast furnace gas dry desulphurization system further comprises an excess pressure power generation device 11, the excess pressure power generation device 11 is connected with the merged gas bypass 9 and the downstream of the secondary desulphurization unit, the desulfurized gas enters the excess pressure power generation device 11, the desulfurized gas is sent to a blast furnace gas user for combustion and use after being decompressed and cooled, and the sulfur dioxide emission concentration reaches the standard and is discharged in the form of flue gas.
A buffer tank 14 is arranged at the upstream of the excess pressure power generation device 11, and the outlet of the coal gas bypass 9 and the outlet of the secondary desulfurization unit are both connected to the buffer tank 14. So that the desulphurization coal gas and the desulphurization coal gas are mixed in the buffer tank 14 and then are sent to users after being mixed, thereby reducing the fluctuation of the pipe network.
In order to enhance the full contact, reaction and adsorption of the coal gas and the desulfurization powder, a venturi reactor (not shown in the figure) is arranged on the pipeline from the front powder desulfurization device 5 to the dry fine dust collector 6, the venturi reactor is the existing equipment, and the structure and the working principle are not described again.
The blast furnace gas dry desulfurization system has a plurality of working modes:
firstly, a preposed powder desulfurization device, an organic sulfur conversion tower and a second-stage dry desulfurization device do not work, blast furnace gas is sent to a user for use after passing through a gas bypass, and is discharged after combustion;
secondly, the preposed powder desulfurizing device works, the organic sulfur conversion tower and the second-stage dry desulfurizing device do not work, the coal gas desulfurized by the preposed powder desulfurizing device is sent to a user for use after passing through a coal gas bypass, and is discharged after being combusted;
thirdly, the preposed powder desulfurization device works, the organic sulfur conversion tower and the second-stage dry desulfurization device work, all the coal gas desulfurized by the preposed powder desulfurization device enters the organic sulfur conversion tower and the second-stage dry desulfurization device for conversion and desulfurization, a coal gas bypass is closed, and the converted and desulfurized coal gas is sent to a user for use and then is combusted and discharged;
or one part of the coal gas desulfurized by the preposed powder desulfurizing device enters the organic sulfur conversion tower and the second-stage dry desulfurizing device for conversion and desulfurization, and the part which does not need desulfurization passes through the coal gas bypass and is mixed with the coal gas subjected to conversion and desulfurization, and the mixture is sent to a user for use and then is combusted and discharged.
When the organic sulfur conversion tower 7 and the second-stage dry desulfurization device 8 work, the distribution of the coal gas quantity entering the pipeline where the coal gas bypass 9 and the second-stage dry desulfurization device 8 are located is realized by controlling the opening degree of the regulating valve group 13.
The utility model discloses, the desulfurization divide into leading desulfurization and second grade desulfurization two-stage arrangement, and the second grade desulfurization is parallelly connected with the bypass, can select whether to use leading powder desulphurization unit 5, whether to use second grade desulfurization unit according to blast furnace gas content, and the rational distribution gets into the coal gas volume of coal gas bypass 9 and second grade desulfurization unit; can adapt to the variable working condition operation of the sulfur-containing change of blast furnace gas and the system safety, and further reduces the operation cost. And the powder desulphurization device has the advantages of small occupied area, simple system and flexible arrangement, is particularly suitable for the desulphurization of the existing blast furnace gas system in the blast furnace area with short occupied area, and has strong system adaptability.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (12)

1. A blast furnace gas dry desulphurization system is used for desulphurization of blast furnace gas after dust removal, and is characterized in that: the device comprises a front-mounted powder desulfurization device, a dry fine dust collector, an organic sulfur conversion tower and a second-stage dry desulfurization device which are sequentially connected along a desulfurization route, wherein the organic sulfur conversion tower and the second-stage dry desulfurization device form a second-stage desulfurization unit, the device also comprises a sulfur content detection device and a coal gas bypass, the sulfur content detection device is used for detecting coal gas before entering the front-mounted powder desulfurization device, the coal gas bypass is connected with the second-stage desulfurization unit in parallel, an adjusting valve group is arranged on the coal gas bypass, and an outlet of the coal gas bypass and an outlet of the second-stage desulfurization unit are converged.
2. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: the regulating valve group comprises a flow regulating valve and/or a pressure regulating valve.
3. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: the blast furnace gas dry desulphurization system further comprises a powder storage tank, and the powder storage tank provides desulphurization powder for the front powder desulphurization device.
4. The blast furnace gas dry desulphurization system according to claim 3, characterized in that: the second-stage dry desulfurization device is a second-stage powder desulfurization device, and the powder storage tank is used for providing desulfurization powder for the second-stage powder desulfurization device.
5. The blast furnace gas dry desulfurization system according to claim 4, characterized in that: and a powder catcher is connected behind the second-stage powder desulfurizing device and used for separating desulfurized coal gas from desulfurized powder and collecting the desulfurized powder.
6. The blast furnace gas dry desulfurization system according to claim 4, characterized in that: and the powder storage tank takes nitrogen or blast furnace gas as carrier gas, and the desulfurized powder is sent to the preposed powder desulfurizing device or the second-stage powder desulfurizing device.
7. The blast furnace gas dry desulphurization system according to claim 3, characterized in that: the desulfurization powder is active carbon powder, alkaline desulfurization powder or a mixture of the active carbon powder and the alkaline desulfurization powder.
8. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: the second-stage dry desulfurization device is a hydrogen sulfide dry adsorption tower.
9. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: and a control valve is arranged on a connecting pipeline between the organic sulfur conversion tower and the dry fine dust collector.
10. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: blast furnace gas dry desulfurization system still includes blast furnace, dry process coarse dust collector and excess pressure power generation facility, the air inlet of dry process coarse dust collector is connected to the blast furnace export, the gas outlet of dry process coarse dust collector passes through the pipeline and is connected with leading powder desulphurization unit, the low reaches after coal gas bypass and second grade desulfurization unit converge are connected to excess pressure power generation facility.
11. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: the blast furnace gas dry desulphurization system also comprises a buffer tank, and the buffer tank is connected to the downstream of the gas bypass after the gas bypass and the secondary desulphurization unit are converged.
12. The blast furnace gas dry desulfurization system according to claim 1, characterized in that: and a venturi reactor is arranged on a pipeline from the front powder desulfurization device to the dry fine dust collector.
CN201921291923.1U 2019-08-09 2019-08-09 Blast furnace gas dry desulphurization system Active CN210367569U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110387270A (en) * 2019-08-09 2019-10-29 中冶赛迪技术研究中心有限公司 Blast furnace gas dry desulphurization system and method
CN111849566A (en) * 2020-07-30 2020-10-30 中国科学院过程工程研究所 Blast furnace gas hydrolysis desulfurization device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110387270A (en) * 2019-08-09 2019-10-29 中冶赛迪技术研究中心有限公司 Blast furnace gas dry desulphurization system and method
CN110387270B (en) * 2019-08-09 2024-03-01 中冶赛迪技术研究中心有限公司 Dry desulfurization system and method for blast furnace gas
CN111849566A (en) * 2020-07-30 2020-10-30 中国科学院过程工程研究所 Blast furnace gas hydrolysis desulfurization device and method

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