CN220450115U - Blast furnace gas fine desulfurization system - Google Patents
Blast furnace gas fine desulfurization system Download PDFInfo
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- CN220450115U CN220450115U CN202321953676.3U CN202321953676U CN220450115U CN 220450115 U CN220450115 U CN 220450115U CN 202321953676 U CN202321953676 U CN 202321953676U CN 220450115 U CN220450115 U CN 220450115U
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 65
- 230000023556 desulfurization Effects 0.000 title claims abstract description 65
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 50
- 230000007062 hydrolysis Effects 0.000 claims abstract description 49
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims description 157
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 239000000428 dust Substances 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 7
- 238000000746 purification Methods 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 description 33
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 18
- 229910052717 sulfur Inorganic materials 0.000 description 12
- 239000011593 sulfur Substances 0.000 description 12
- 230000003009 desulfurizing effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 125000001741 organic sulfur group Chemical group 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003223 protective agent Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of gas purification, and discloses a blast furnace gas fine desulfurization system which comprises a dechlorination tower, a hydrolysis tower and a desulfurization tower, wherein a gas inlet of the dechlorination tower is communicated with a gas main pipe through a first air inlet pipeline, a gas outlet of the dechlorination tower is communicated with the gas main pipe through a first air outlet pipeline, a gas inlet of the hydrolysis tower is communicated with the first air outlet pipeline through a second air inlet pipeline, a gas outlet of the hydrolysis tower is communicated with the gas main pipe through a second air outlet pipeline, a gas inlet of the desulfurization tower is communicated with the second air outlet pipeline through a third air inlet pipeline, a gas outlet of the desulfurization tower is communicated with the gas main pipe through a third air outlet pipeline, and a first valve, a second valve, a third valve and a fourth valve are sequentially arranged on the gas main pipe. The three radial flow reactors of the dechlorination tower, the hydrolysis tower and the desulfurization tower are communicated end to end and are mutually independent, a main gas pipe is reserved as a bypass, and the three reactors are respectively connected to the main gas pipe and can be respectively and independently controlled.
Description
Technical Field
The utility model belongs to the technical field of gas purification, and particularly relates to a blast furnace gas fine desulfurization system.
Background
At present, the domestic blast furnace gas fine desulfurization is still in a starting stage, and the running time of the put-into-operation device is not long. The conventional coke oven gas desulfurization technology is generally used, and the coke oven gas desulfurization technology can be classified into a dry method and a wet method according to the physical property state of a desulfurization catalyst, and can be classified into a normal temperature method and a high temperature method according to the use temperature. Because of the difference of gas components and different using purposes, when the method is used for the blast furnace gas desulfurization process, the desulfurization cost is high, the economy is poor, and the popularization and the application are restricted.
Disclosure of Invention
The present utility model aims to solve the above technical problems at least to some extent. Therefore, the utility model aims to provide a blast furnace gas fine desulfurization system.
The technical scheme adopted by the utility model is as follows:
the gas inlet of the dechlorination tower is communicated with a gas main pipe through a first gas inlet pipeline, the gas outlet of the dechlorination tower is communicated with the gas main pipe through a first gas outlet pipeline, the gas inlet of the hydrolysis tower is communicated with the first gas outlet pipeline through a second gas inlet pipeline, the gas outlet of the hydrolysis tower is communicated with the gas main pipe through a second gas outlet pipeline, the gas inlet of the desulfurization tower is communicated with the second gas outlet pipeline through a third gas inlet pipeline, the gas outlet of the desulfurization tower is communicated with the gas main pipe through a third gas outlet pipeline, a first valve, a second valve, a third valve and a fourth valve are sequentially arranged on the gas main pipe, the first valve is positioned between the first gas inlet pipeline and the first gas outlet pipeline, the second valve is positioned between the first gas outlet pipeline and the second gas outlet pipeline, the third valve is positioned between the second gas outlet pipeline and the third gas outlet pipeline, and the fourth valve is positioned behind the third gas outlet pipeline.
Preferably, the material inlets of the dechlorination tower, the hydrolysis tower and the desulfurization tower are connected with a charging tank, the material outlets of the dechlorination tower, the hydrolysis tower and the desulfurization tower are connected with a discharging tank, and the charging tank is communicated with a lifting device. The charging tanks are all connected with a nitrogen source, and the discharging tanks are all connected with the bag-type dust remover.
Preferably, a fifth valve, a first diffusing device and a sixth valve are sequentially arranged on the first air inlet pipeline, a seventh valve and a fifteenth valve are sequentially arranged on the first air outlet pipeline, and the communication part of the second air inlet pipeline and the first air outlet pipeline is positioned between the seventh valve and the fifteenth valve; an eighth valve, a second diffusing device and a ninth valve are sequentially arranged on the second air inlet pipeline, a tenth valve and a sixteenth valve are sequentially arranged on the second air outlet pipeline, and the communication part of the third air inlet pipeline and the second air outlet pipeline is positioned between the tenth valve and the sixteenth valve; an eleventh valve, a third diffusing device and a twelfth valve are sequentially arranged on the third air inlet pipeline, and a thirteenth valve and a fourteenth valve are sequentially arranged on the third air outlet pipeline.
The beneficial effects of the utility model are as follows:
1. the blast furnace gas fine desulfurization system provided by the utility model removes impurities such as chloride in blast furnace gas in a dechlorination tower, only contains sulfide in the gas, and comprises organic sulfur and inorganic sulfur, the organic sulfur is converted into hydrogen sulfide under the catalysis of a hydrolysis catalyst in a hydrolysis tower, so that harmful substances in the hydrolyzed gas are mainly hydrogen sulfide, the harmful substances are catalyzed and oxidized into elemental sulfur by a desulfurization catalyst in the desulfurization tower, the elemental sulfur is adsorbed in pores of the desulfurization catalyst, the desulfurization effect is achieved, and the sulfur content in the clean gas is less than 20mg/Nm 3 Meets the ultra-low emission requirement of the desulfurization of the blast furnace gas source.
2. The three radial flow reactors of the dechlorination tower, the hydrolysis tower and the desulfurization tower are communicated end to end and are mutually independent, the system keeps a gas main pipe from a dry dust remover to a TRT/BPRT device as a bypass, and the three reactor gas outlet pipelines are respectively connected to the gas main pipe, so that the dechlorination tower, the hydrolysis tower and the desulfurization tower can be respectively and independently controlled.
3. The utility model can efficiently and cooperatively remove the total sulfur in the blast furnace gas, has simple process flow, small system resistance, no need of adding water in the whole process, is a full-dry technology and is not affected by CO in the gas 2 Influence, no waste water is discharged. The best desulfurization effect can be achieved when the temperature of the gas is 80-180 ℃, the whole system is arranged before the TRT/BPRT device, and a new heat exchange device is not needed.
Drawings
FIG. 1 is a schematic diagram of a blast furnace gas fine desulfurization system of the present utility model.
In the figure: 1-a dechlorination tower; 2-a hydrolysis tower; 3-desulfurizing tower; 4-a main gas pipe; 5-a first air inlet pipeline; 6-a first air outlet pipeline; 7-a second air inlet pipeline; 8-a second air outlet pipeline; 9-a third air inlet pipeline; 10-a third air outlet pipeline; 11-a first valve; 12-a second valve; 13-a third valve; 14-fourth valve; 15-a fifth valve; 16-sixth valve; 17-seventh valve; 18-eighth valve; 19-ninth valve; 20-tenth valve; 21-eleventh valve; 22-twelfth valve; 23-thirteenth valve; 24-fourteenth valve; 25-fifteenth valve; 26-sixteenth valve; 27-a first diffusing means; 28-a second diffusing means; 29-a third diffusing means; 30-a filter; 31-a first charging tank; 32-a second charging tank; 33-a third charging tank; 34-a first discharge tank; 35-a second discharge tank; 36-a third discharge tank; 37-lifting device; 38-a bag-type dust collector.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
The utility model will be further described with reference to the drawings and specific examples.
As shown in fig. 1, the blast furnace gas fine desulfurization system of the embodiment comprises a dechlorination tower 1, a hydrolysis tower 2, a desulfurization tower 3 and a gas main pipe 4, wherein the inlet end of the gas main pipe 4 is connected with a dry dust collector, and the outlet end of the gas main pipe 4 is connected with a TRT/BPRT device. The gas inlet of the dechlorination tower 1 is communicated with the gas main pipe 4 through a first gas inlet pipeline 5, the gas outlet of the dechlorination tower 1 is communicated with the gas main pipe 4 through a first gas outlet pipeline 6, the gas inlet of the hydrolysis tower 2 is communicated with the first gas outlet pipeline 6 through a second gas inlet pipeline 7, the gas outlet of the hydrolysis tower 2 is communicated with the gas main pipe 4 through a second gas outlet pipeline 8, the gas inlet of the desulfurization tower 3 is communicated with the second gas outlet pipeline 8 through a third gas inlet pipeline 9, and the gas outlet of the desulfurization tower 3 is communicated with the gas main pipe 4 through a third gas outlet pipeline 10.
The blast furnace gas enters a dechlorination tower 1 through a first air inlet pipeline 5 after passing through a dry dust remover, the dechlorination tower is a radial flow fixed bed dechlorination tower, the dechlorination tower is composed of a cylinder body, a gas-purifying chamber, a material bed, a central air inlet pipe and the like from outside to inside, the blast furnace gas enters the central air inlet pipe, horizontally passes through a dechlorination catalyst bed layer through pipe wall micropores, inorganic acid radical chloride ions such as Cl & lt- & gt in the blast furnace gas react with metal oxides in the dechlorination catalyst to generate stable chloride, and the stable chloride is reserved in the catalyst micropores, wherein the chemical reaction formula is as follows:
MO+2HCl＝MCl 2 +H 2 O。
meanwhile, dust in blast furnace gas enters a material bed along with the gas, is not only subject to the action of gravity, but also is continuously intercepted when passing through gaps among material particles, the fluidity is far smaller than that of the gas, the gas is gradually separated from the gas and left in a bed layer, and the gas and saturated dechlorination catalyst are cleared out of a tower together during discharging, so that the effects of intercepting the dust and removing dust are achieved.
The blast furnace gas enters the hydrolysis tower 2 through the second air inlet pipeline 7 after being treated by the dechlorination tower 1, the hydrolysis tower is a radial flow fixed bed hydrolysis tower, and the hydrolysis tower and the dechlorination tower are similar in structure and comprise a cylinder body, a gas purifying chamber, a material bed, a central air inlet pipe and the like from outside to inside. The blast furnace gas passes through a hydrolysis tower, COS in the blast furnace gas reacts with trace water vapor under the action of a hydrolysis catalyst to generate CO 2 And H 2 S, COS hydrolysis chemical reaction formula is:
COS+H 2 O＝H 2 S+CO 2 。
after the blast furnace gas is treated by the hydrolysis tower 2, COS and CS in the blast furnace gas 2 Most of the organic sulfur is converted into H 2 S, then enters the desulfurizing tower 3 through a third air inlet pipeline 9, the desulfurizing tower is a high-efficiency radial fixed bed reaction tower, the structure of the desulfurizing tower is similar to that of a dechlorination tower and a hydrolysis tower, a desulfurizing catalyst is filled in the tower, and most of H in blast furnace gas is contained in the tower 2 S is catalyzed and oxidized to generate elemental sulfur under the action of a desulfurization catalyst, and the elemental sulfur is adsorbed in a pore structure of the desulfurization catalyst, so that the total sulfur content in coal gas is reduced to below 1ppm, and the chemical reaction formula is as follows:
2H 2 S+O 2 →2S+2H 2 O。
after purification, the total sulfur is less than or equal to 20mg/Nm 3 The clean gas is cooled and decompressed by a TRT/BPRT device and then sent to each user point. The whole flow of the blast furnace gas fine desulfurization system is arranged in front of the TRT/BPRT device, so that the influence on the power generation of the TRT/BPRT device can be effectively reduced, the hydrolysis of organic sulfur in the gas into inorganic sulfur can be realized under the condition of high temperature of 80-150 ℃, sulfide in the gas is selectively converted into elemental sulfur and is adsorbed in the pore structure of the catalyst, and the high-efficiency removal of sulfide in the blast furnace gas is realized. The organic sulfur hydrolysis conversion rate is more than or equal to 90 percent, the pressure drop of the reactor is less than 1000Pa, and the total sulfur content of the purified gas is less than or equal to20mg/Nm 3 。
The material inlets of the dechlorination tower 1, the hydrolysis tower 2 and the desulfurization tower 3 are connected with a first charging tank 31, a second charging tank 32 and a third charging tank 33, the material outlets of the dechlorination tower 1, the hydrolysis tower 2 and the desulfurization tower 3 are connected with a first discharging tank 34, a second discharging tank 35 and a third discharging tank 36, and the charging tanks are communicated with a lifting device 37; the feed tanks are all connected with a nitrogen source, and the discharge tanks are all connected with a bag-type dust collector 38.
Fresh dechlorination catalyst, hydrolysis catalyst and desulfurization catalyst respectively enter corresponding charging tanks through a lifting device 37 under the protection of nitrogen, then are divided into four paths to enter corresponding reactors, the waste catalyst saturated in adsorption is discharged into corresponding discharging tanks under the protection of nitrogen, and is discharged out of a boundary region after being cooled and decompressed, and clean nitrogen is discharged into a factory emptying pipeline after the emptying nitrogen is filtered through a bag-type dust collector 38.
The treatment modes of the waste catalyst are as follows: delivering the waste to a specific section of a steel mill for incineration treatment, so as to realize the treatment of dangerous waste in the mill; as a production raw material of sulfuric acid, the sulfuric acid is sent to a sulfuric acid plant to realize the recycling of waste; and (5) regenerating treatment. The catalyst of the system is biomass activated carbon material, activated carbon can be recycled, and meanwhile, sulfur is recovered, so that the recycling of pollutants is realized.
In order to enable the coal gas of the coal gas main pipe 4 to sequentially pass through the dechlorination tower 1, the hydrolysis tower 2 and the desulfurization tower 3, a first valve 11, a second valve 12, a third valve 13 and a fourth valve 14 are sequentially arranged on the coal gas main pipe 4, the first valve 11 is positioned between the first air inlet pipeline 5 and the first air outlet pipeline 6, the second valve 12 is positioned between the first air outlet pipeline 6 and the second air outlet pipeline 8, the third valve 13 is positioned between the second air outlet pipeline 8 and the third air outlet pipeline 10, and the fourth valve 14 is positioned behind the third air outlet pipeline 10.
In order to facilitate the maintenance and the loading/unloading of the protective agent of the blast furnace gas fine desulfurization system, a fifth valve 15, a first diffusing device 27 and a sixth valve 16 are sequentially arranged on the first air inlet pipeline 5, a seventh valve 17 and a fifteenth valve 25 are sequentially arranged on the first air outlet pipeline 6, and the communication part of the second air inlet pipeline 7 and the first air outlet pipeline 6 is positioned between the seventh valve 17 and the fifteenth valve 25; the second air inlet pipeline 7 is sequentially provided with an eighth valve 18, a second diffusing device 28 and a ninth valve 19, the second air outlet pipeline 8 is sequentially provided with a tenth valve 20 and a sixteenth valve 26, and the communication part of the third air inlet pipeline 9 and the second air outlet pipeline 8 is positioned between the tenth valve 20 and the sixteenth valve 26; an eleventh valve 21, a third diffusing device 29 and a twelfth valve 22 are sequentially arranged on the third air inlet pipeline 9, and a thirteenth valve 23 and a fourteenth valve 24 are sequentially arranged on the third air outlet pipeline 10. A filter 30 is provided on the third outlet pipe 10, the filter 30 being located between the thirteenth valve 23 and the fourteenth valve 24.
As shown in fig. 1, when the blast furnace gas fine desulfurization system works normally, the first valve 11, the second valve 12, the third valve 13, the fifteenth valve 25 and the sixteenth valve 26 on the gas main pipe 4 are closed, the fourth valve 14-the fourteenth valve 24 are opened, and after the blast furnace gas passes through the dechlorination tower 1, the hydrolysis tower 2, the desulfurization tower 3 and the filter 30 in sequence, the clean gas returns to the gas main pipe 4 to be sent to the TRT/BPRT device.
When the dechlorination tower needs to be overhauled or the dechlorination catalyst is loaded/unloaded, nitrogen is used for protection replacement, and the specific steps are as follows:
(1) Keeping the second valve 12, the third valve 13, the sixteenth valve 26 closed;
(2) Opening the valve first valve 11 and the fifteenth valve 25;
(3) Sequentially closing the fifth valve 15, the seventh valve 17 and the sixth valve 16, and keeping the opening states of the eighth valve 18, the fourteenth valve 24 and the fourth valve 14, wherein the dechlorination tower is independently cut off from the main system;
(4) After the residual gas in the first air inlet pipeline 5 at the inlet of the dechlorination tower is diffused by the first diffusing device 27 between the fifth valve 15 and the sixth valve 16, nitrogen enters the dechlorination tower through the first charging tank 31, is discharged through the first discharging tank 34 and is sent to the bag-type dust remover 38, clean nitrogen is discharged into a factory emptying pipeline, and the dechlorination tower can be overhauled or loaded/unloaded with protective agent independently, and the main system can still complete hydrolysis and desulfurization reactions.
When the hydrolysis tower needs to be overhauled or the hydrolysis catalyst is loaded/unloaded, the nitrogen protection replacement steps are as follows:
(1) Keeping the first valve 11 and the third valve 13 closed;
(2) Opening the valve second valve 12, the fifteenth valve 25, the sixteenth valve 26;
(3) Sequentially closing an eighth valve 18, a tenth valve 20 and a ninth valve 19, and keeping the rest valves in an open state, wherein the hydrolysis tower is independently cut off from the main system;
(4) After the residual gas in the gas pipeline at the inlet of the hydrolysis tower is diffused by the second diffusing device 28 between the eighth valve 18 and the ninth valve 19, nitrogen enters the hydrolysis tower through the second charging tank 32 and is discharged through the second discharging tank 35 to be sent to the bag-type dust collector 38, clean nitrogen is discharged into the factory emptying pipeline, so that the hydrolysis tower can be overhauled or the hydrolysis catalyst can be loaded/unloaded independently, and the main system can still complete dechlorination and desulfurization reactions.
When the desulfurization tower needs to be overhauled or the desulfurization catalyst is assembled/disassembled, the nitrogen protection replacement steps are as follows:
(1) Keeping the first valve 11, the second valve 12, the fifteenth valve 25 closed;
(2) Opening the valve third valve 13 and the sixteenth valve 26;
(3) Sequentially closing an eleventh valve 21, a thirteenth valve 23, a twelfth valve 22 and a fourteenth valve 24, and keeping the rest valves in an open state, wherein the desulfurizing tower is independently cut off from the main system;
(4) After the residual gas in the gas pipeline at the inlet of the desulfurizing tower is diffused by a third diffusing device 29 between the eleventh valve 21 and the twelfth valve 22, nitrogen enters the desulfurizing tower through a third charging tank 33 and is discharged through a third discharging tank 36 to be sent to a bag-type dust remover 38, clean nitrogen is discharged into a factory emptying pipeline, so that the desulfurizing tower can be overhauled or the adsorbent can be loaded/unloaded independently, and the main system can still complete dechlorination and hydrolysis reactions.
When the blast furnace gas fine desulfurization system is directly connected to the TRT/BPRT device without fine desulfurization treatment, the first valve 11-the fourth valve 14 are opened, and the rest valves are closed. And (3) repeating the step (4) to finish the system protection without influencing the service life of the catalyst in the tower.
Example 1
From blast furnace gas, flow rate: q=200000 Nm 3 And/h, gas pressure: p=0.15 MPa, gas temperature: t=100 ℃, sulfide content in blast furnace gas: COS:40-150mg/Nm 3 ，H 2 S：20-100mg/Nm 3 Blast furnace gas composition (vol): CO:20-40%, H 2 ：2-10％、CO 2 ：3-30％、N 2 ：30-60％、O 2 :0.01-0.3%, dust:<10mg/Nm 3 . The main gas pipe is 4 in gas flow rate u=18m/s, and the catalyst space velocity u=1000h -1 。
After the blast furnace gas is subjected to dry dedusting, the blast furnace gas firstly enters a dechlorination tower 1, and after the gas fully acts with a dechlorination catalyst, acid gases such as HCl and the like are effectively removed. The blast furnace gas after dechlorination enters a hydrolysis tower 2, and organic sulfur in the gas is efficiently converted into inorganic sulfur under the action of a hydrolysis catalyst. The original and converted inorganic sulfur in the gas enters a desulfurization tower 3 to be catalyzed and oxidized into elemental sulfur by a desulfurization catalyst, and is adsorbed in a pore structure of the desulfurization catalyst, so that the fine desulfurization of the blast furnace gas is realized. The blast furnace gas discharged from the desulfurizing tower 3 is discharged into a factory pipe network after passing through a filter.
The annual protective agent dosage of the device is about 240m 3 The annual hydrolysis catalyst is used in an amount of about 240m 3 The annual adsorbent dosage is about 400m 3 The total sulfur of the clean gas is less than 20mg/Nm 3 。
The blast furnace gas fine desulfurization system is arranged behind the dry dust collector and in front of the TRT/BPRT device. The outlet of the dry dust collector is 90-200 ℃ and the blast furnace gas of 150-300kPa is cooled to 50-70 ℃ and 10-20kPa after passing through a TRT/BPRT device. The dechlorination catalyst, the hydrolysis catalyst and the desulfurization catalyst required by the system can reach the optimal catalytic effect in the environments of 80-200 ℃ and 80-150 ℃ respectively, and the environments are highly consistent with the temperature interval of blast furnace gas before the TRT/BPRT device, and a heat exchange device is not required to be additionally arranged.
The system is arranged in front of the TRT/BPRT device, and the sulfur content of the clean gas entering the TRT/BPRT device is less than 20mg/Nm 3 The chloride in the gas is removed, so that on one hand, the corrosion of the gas to BPRT is greatly reduced, and on the other hand, the device system is providedThe resistance is low, the influence on the power generation of the TRT/BPRT device is only about 1.3%, the influence on the gas pressure and the temperature of a rear pipe network is avoided, and the influence on the operation of a rear hot blast stove and a heating furnace is avoided.
The utility model is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present utility model, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present utility model, fall within the scope of protection of the present utility model.
Claims (6)
1. A blast furnace gas fine desulfurization system is characterized in that: comprises a dechlorination tower (1), a hydrolysis tower (2) and a desulfurization tower (3), wherein a gas inlet of the dechlorination tower (1) is communicated with a gas main pipe (4) through a first gas inlet pipeline (5), a gas outlet of the dechlorination tower (1) is communicated with the gas main pipe (4) through a first gas outlet pipeline (6), a gas inlet of the hydrolysis tower (2) is communicated with the first gas outlet pipeline (6) through a second gas inlet pipeline (7), a gas outlet of the hydrolysis tower (2) is communicated with the gas main pipe (4) through a second gas outlet pipeline (8), a gas inlet of the desulfurization tower (3) is communicated with the second gas outlet pipeline (8) through a third gas inlet pipeline (10), a first valve (11), a second valve (12), a third valve (13) and a fourth valve (14) are sequentially arranged on the gas main pipe (4), the first valve (11) is positioned between the first gas inlet pipeline (5) and the first gas outlet pipeline (6), the second valve (12) is positioned between the second gas outlet pipeline (6) and the third valve (13) and the third gas outlet pipeline (8) is positioned between the third valve (13) and the third gas outlet pipeline (8), the fourth valve (14) is positioned behind the third outlet pipeline (10).
2. The blast furnace gas fine desulfurization system according to claim 1, wherein: the material inlets of the dechlorination tower (1), the hydrolysis tower (2) and the desulfurization tower (3) are connected with a charging tank, the material outlets of the dechlorination tower (1), the hydrolysis tower (2) and the desulfurization tower (3) are connected with a discharging tank, and the charging tank is communicated with a lifting device (37).
3. The blast furnace gas fine desulfurization system according to claim 2, wherein: the charging tanks are all connected with a nitrogen source, and the discharging tanks are all connected with a bag-type dust remover (38).
4. The blast furnace gas fine desulfurization system according to claim 1, wherein: a fifth valve (15), a first diffusing device (27) and a sixth valve (16) are sequentially arranged on the first air inlet pipeline (5), a seventh valve (17) and a fifteenth valve (25) are sequentially arranged on the first air outlet pipeline (6), and the communication part of the second air inlet pipeline (7) and the first air outlet pipeline (6) is positioned between the seventh valve (17) and the fifteenth valve (25); an eighth valve (18), a second diffusing device (28) and a second diffusing device are sequentially arranged on the second air inlet pipeline (7)
A ninth valve (19), a tenth valve (20) and a sixteenth valve (26) are sequentially arranged on the second air outlet pipeline (8), and the communication position of the third air inlet pipeline (9) and the second air outlet pipeline (8) is positioned between the tenth valve (20) and the sixteenth valve (26); an eleventh valve (21), a third diffusing device (29) and a twelfth valve (22) are sequentially arranged on the third air inlet pipeline (9), and a thirteenth valve (23) and a fourteenth valve (24) are sequentially arranged on the third air outlet pipeline (10).
5. The blast furnace gas fine desulfurization system according to claim 1, wherein: and a filter (30) is arranged on the third air outlet pipeline (10).
6. The blast furnace gas fine desulfurization system according to claim 1, wherein: the inlet end of the gas main pipe (4) is connected with the dry dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321953676.3U CN220450115U (en) | 2023-07-24 | 2023-07-24 | Blast furnace gas fine desulfurization system |
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