CN217398831U - Blast furnace gas sulfur recovery system - Google Patents
Blast furnace gas sulfur recovery system Download PDFInfo
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- CN217398831U CN217398831U CN202221411783.9U CN202221411783U CN217398831U CN 217398831 U CN217398831 U CN 217398831U CN 202221411783 U CN202221411783 U CN 202221411783U CN 217398831 U CN217398831 U CN 217398831U
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- 239000011593 sulfur Substances 0.000 title claims abstract description 129
- 238000011084 recovery Methods 0.000 title claims abstract description 64
- 238000001179 sorption measurement Methods 0.000 claims abstract description 88
- 238000001816 cooling Methods 0.000 claims abstract description 75
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 59
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- 150000003464 sulfur compounds Chemical class 0.000 claims abstract description 27
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- 239000000126 substance Substances 0.000 claims abstract description 15
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- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
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- 230000007246 mechanism Effects 0.000 claims description 55
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to a blast furnace gas sulfur recovery system, include: the device comprises a pretreatment device, a hydrolysis device, an adsorption device, a desorption back-flushing device and a sulfur recovery device. The pretreatment device carries out cooling and dewatering on blast furnace gas to be treated; the hydrolysis device separates sulfur-containing substances in the blast furnace gas treated by the pretreatment device; the adsorption device carries out desulfurization treatment on the coal gas hydrolyzed by the hydrolysis device; the desorption back-blowing device heats the desulfurized coal gas and then reversely feeds the heated coal gas into the adsorption device to carry out desorption reaction; the sulfur recovery device replaces sulfur simple substance from the desorption gas and recovers the sulfur simple substance; the sulfur recovery device comprises a sulfur desublimation device and a dust remover. The coal gas after adsorption is heated and recycled by arranging the desorption back-blowing device and the sulfur recovery device, the sulfur compounds in the adsorbent are separated out by desorbing the adsorbent, the sulfur compounds are condensed and fixed by the sulfur recovery device, and finally the sulfur compounds and the sulfur are recovered by the dust remover.
Description
Technical Field
The application relates to the technical field of desulfurization equipment, in particular to a sulfur recovery system for blast furnace gas.
Background
Blast furnace gas is a byproduct combustible gas in the blast furnace ironmaking production process, and comprises 6-12% of carbon dioxide, 28-33% of carbon monoxide, 1-4% of hydrogen, 55-60% of nitrogen, 0.2-0.5% of hydrocarbons and a small amount of hydrogen sulfide, carbonyl sulfide, hydrogen chloride, water vapor, dust and the like, and the gas containing combustible carbon monoxide is a low-calorific-value gas fuel and can be used as a self-use gas for metallurgical enterprises, such as heating hot rolled steel ingots, preheating ladles and the like. The blast furnace gas has more impurities, the sulfur content in hydrogen sulfide and carbonyl sulfide is more than 100mg/m3, and the blast furnace gas becomes sulfur dioxide after combustion to pollute the environment; the water vapor content is more than 30g/m3, the fuel heat value is reduced, and the heat loss of the exhaust smoke after combustion of a user is increased; the hydrogen chloride can cause pipeline corrosion, and the dust can block the pipeline; in order to reduce the maintenance cost of subsequent pipeline equipment and reduce pollution emission, the source dehumidification and desulfurization of blast furnace gas are needed.
By using the existing dry desulphurization process of coke oven gas and natural gas, the desulfurized sulfur-containing impurities are not recycled, so that the waste of sulfur resources is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application provides a blast furnace gas sulfur recovery system, which adopts a new process design concept, and can realize desulfurization of blast furnace gas, and recover sulfur compounds, thereby realizing recovery and utilization of sulfur resources.
In order to achieve the above object, the present application provides a blast furnace gas sulfur recovery system, comprising: a pretreatment device, a hydrolysis device, an adsorption device, a desorption back-blowing device and a sulfur recovery device.
The gas inlet of the pretreatment device is communicated with the gas phase of the blast furnace coal to be treated, and the pretreatment device is used for cooling and dewatering the blast furnace coal gas to be treated.
The gas inlet of the hydrolysis device is communicated with the gas outlet of the pretreatment device, and the hydrolysis device is used for separating sulfur-containing substances in the blast furnace gas treated by the pretreatment device.
The adsorption device comprises a first air inlet, a second air inlet, a first air outlet and a second air outlet, the first air inlet of the adsorption device is communicated with the air outlet of the hydrolysis device, and the adsorption device is used for performing desulfurization treatment on the coal gas hydrolyzed by the hydrolysis device.
The desorption blowback device, the air inlet of desorption blowback device switches on with adsorption equipment's first gas outlet mutually, the gas outlet of desorption blowback device switches on with adsorption equipment's second air inlet mutually, desorption blowback device is used for heating the gas after the desulfurization back and reversely lets in adsorption equipment and carries out the desorption reaction, desorption blowback device includes second heating device, second heating device includes one-level heating mechanism, one-level heating mechanism includes one-level heating cavity and tertiary heating pipe, tertiary heating pipe is the heliciform cover and establishes in one-level heating cavity outside.
The gas inlet of the sulfur recovery device is communicated with the second gas outlet of the adsorption device, and the sulfur recovery device is used for replacing sulfur simple substances from the desorption gas and recovering the sulfur simple substances; the sulfur recovery device comprises a sulfur desublimation device and a dust remover, and the sulfur desublimation device and the dust remover are sequentially arranged along the gas flowing direction; the sulfur recovery device also comprises a purging pipeline which is arranged between the sulfur desublimation device and the dust remover.
In some embodiments, the sulfur recovery unit further comprises: and (4) an oxidation mechanism. The oxidation mechanism is arranged between the adsorption device and the sulfur desublimation device and is used for oxidizing sulfur compounds.
In some embodiments, the pre-treatment device comprises a first cooling device, a first heating device, a gas dehumidifier, and a gas rewarming device;
the gas inlet of the gas dehumidifier is communicated with blast furnace gas to be treated, the first cooling device is sleeved outside the gas dehumidifier and is in contact with the outer wall of the gas dehumidifier, and the first cooling device is used for cooling the blast furnace gas to be treated;
the gas rewarming device comprises a third gas inlet, the third gas inlet is communicated with the gas outlet of the gas dehumidifier, and the gas outlet of the gas rewarming device is communicated with the hydrolysis device;
the first heating device is arranged outside the gas rewarming device, is contacted with the outer wall of the gas rewarming device and is used for heating the dehumidified blast furnace gas.
In some embodiments, the gas reheater further comprises a fourth gas inlet, and the outlet of the sulfur recovery unit is communicated with the fourth gas inlet of the gas reheater.
In some embodiments, the first cooling device comprises a primary cooling mechanism and a secondary cooling mechanism;
the primary cooling mechanism is arranged outside the gas dehumidifier and positioned at one end close to the gas inlet of the gas dehumidifier, and is used for carrying out primary cooling on blast furnace gas to be treated;
the secondary cooling mechanism is arranged outside the gas dehumidifier and positioned at one end close to the gas outlet of the gas dehumidifier, and is used for carrying out secondary cooling on blast furnace gas to be treated, and is connected with a second cold source which is chilled water;
the first-stage cooling mechanism and the second-stage cooling mechanism are arranged independently and are not communicated with each other.
In some embodiments, the first heating device is a heating pipe, and the heating pipe is spirally sleeved outside the gas rewarming device;
alternatively, the first heating device is a first heat exchanger.
In some embodiments, the heating tube comprises a primary heating tube and a secondary heating tube;
the primary heating pipe is arranged outside the gas rewarming device and positioned at one end close to the gas inlet of the gas rewarming device and used for carrying out primary heating on the dehumidified blast furnace gas, and the primary heating pipe is connected with a first heat source which is hot water;
the secondary heating pipe is arranged outside the gas rewarming device and is positioned at one end close to the gas outlet of the gas rewarming device, the secondary heating pipe is used for carrying out secondary heating on blast furnace gas to be treated, the secondary heating pipe is connected with a second heat source, and the second heat source is hot steam;
the first-stage heating pipe and the second-stage heating pipe are mutually independent and are not communicated with each other.
In some embodiments, the pretreatment device further comprises a dechlorination device, an air inlet of the dechlorination device is connected with an air outlet of the coal gas rewarming device, an air outlet of the dechlorination device is connected with an air inlet of the hydrolysis device, and the dechlorination device is used for removing chlorine-containing impurities in the rewarmed coal gas.
In some embodiments, the hydrolysis apparatus comprises a plurality of hydrolysis columns and the adsorption apparatus comprises a plurality of adsorption columns;
the gas outlet of each hydrolysis tower is correspondingly communicated with the gas inlet of one adsorption tower, the gas inlets of all the hydrolysis towers are communicated with the gas outlet of the same pretreatment device, and the first gas outlets of all the adsorption towers are communicated with the gas inlet of the same desorption back flushing device.
In some embodiments, the adsorption device further includes an adsorption body, a cavity is formed in the adsorption body, an oxidant and an adsorbent are arranged in the cavity, the oxidant and the adsorbent are arranged in a position region which is not overlapped with each other, and the oxidant is arranged in a predetermined region of the second air outlet.
Be different from prior art, above-mentioned technical scheme is through setting up desorption blowback device and sulphur recovery unit, heat the coal gas after adsorbing and recycle, when the adsorbent in the adsorption equipment adsorbs saturation, with net coal gas reverse access in the adsorption equipment, the desorption adsorbent is appeared with the sulphur compound in the adsorbent, it is fixed to carry out the desublimation through sulphur recovery unit again, retrieve through the dust remover at last, realize the recovery of sulphur compound and sulphur, can effectively promote the utilization ratio of material, reduction in production cost.
The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, the present invention may be further implemented according to the content described in the text and the drawings of the present application, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description is made in conjunction with the detailed description of the present application and the drawings.
Drawings
The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the present application, as well as others related thereto, and are not to be construed as limiting the application.
In the drawings of the specification:
FIG. 1 is a schematic view of a sulfur recovery system for blast furnace gas according to an embodiment of the present invention;
fig. 2 is a schematic view of a desorption back-blowing device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a sulfur recovery apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view of a pre-treatment apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic view of a sulfur recovery system for blast furnace gas according to another embodiment of the present invention;
fig. 6 is a schematic view of an adsorption apparatus according to an embodiment of the present invention. The reference numerals referred to in the above figures are explained below:
1. a pretreatment device;
11. a gas dehumidifier;
12. a first cooling device;
121. a primary cooling mechanism;
122. a secondary cooling mechanism;
13. a gas rewarming device;
131. a third air inlet;
132. a fourth air inlet;
14. a first heating device;
141. a first-stage heating pipe;
142. a secondary heating pipe;
143. a first heat exchanger;
15. a dechlorination device;
2. a hydrolysis device;
21. a hydrolysis tower;
3. an adsorption device;
31. an adsorption tower;
32. an oxidizing agent;
33. an adsorbent;
34. a first air inlet;
35. a second air outlet;
36. a first air outlet;
37. a second air inlet;
4. a desorption back-blowing device;
41. a pressurizing device;
42. a second heating device;
421. a primary heating mechanism;
4211. a primary heating cavity;
4212. a third-stage heating pipe;
422. a secondary heating mechanism;
4221. a secondary heating cavity;
4222. an electric heater;
5. a sulfur recovery unit;
51. a sulphur desublimation device;
52. a dust remover;
53. a second cooling device;
531. a second cooling pipe;
532. a second heat exchanger;
54. and (4) an oxidation mechanism.
Detailed Description
In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are only used for clearly illustrating the technical solutions of the present application, and therefore are only used as examples, and the scope of the present application is not limited thereby.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution as long as there is no technical contradiction or conflict.
Unless otherwise defined, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".
In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Without further limitation, in this application, the use of "including," "comprising," "having," or other similar expressions in phrases and expressions of "including," "comprising," or "having," is intended to cover a non-exclusive inclusion, and such expressions do not exclude the presence of additional elements in a process, method, or article that includes the recited elements, such that a process, method, or article that includes a list of elements may include not only those elements but also other elements not expressly listed or inherent to such process, method, or article.
As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. Furthermore, the description of embodiments herein of the present application of the term "plurality" means more than two (including two), and expressions relating to "plurality" similar thereto are also to be understood, such as "plurality", etc., unless explicitly defined otherwise.
In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application are to be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated arrangement; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.
Referring to fig. 1, the present embodiment relates to a sulfur recovery system for blast furnace gas, including: a pretreatment device 1, a hydrolysis device 2, an adsorption device 3, a desorption back-blowing device 4 and a sulfur recovery device 5. The gas inlet of the pretreatment device 1 is communicated with the gas phase of the blast furnace coal to be treated, and the pretreatment device 1 is used for cooling and dewatering the blast furnace coal gas to be treated; the gas inlet of the hydrolysis device 2 is communicated with the gas outlet of the pretreatment device 1, and the hydrolysis device 2 is used for separating sulfur-containing substances in the blast furnace gas treated by the pretreatment device 1; the adsorption device 3 comprises a first air inlet 34, a second air inlet 37, a first air outlet 36 and a second air outlet 35, the first air inlet 34 of the adsorption device 3 is communicated with the air outlet of the hydrolysis device 2, and the adsorption device 3 is used for carrying out desulfurization treatment on the coal gas hydrolyzed by the hydrolysis device 2; the gas inlet of the desorption back-blowing device 4 is communicated with the first gas outlet 36 of the adsorption device 3, the gas outlet of the desorption back-blowing device 4 is communicated with the second gas inlet 37 of the adsorption device 3, and the desorption back-blowing device 4 is used for heating the desulfurized coal gas and then reversely introducing the heated coal gas into the adsorption device 3 for desorption reaction; the gas inlet of the sulfur recovery device 5 is communicated with the second gas outlet 35 of the adsorption device 3, and the sulfur recovery device 5 is used for replacing sulfur simple substances from the desorption gas and recovering the sulfur simple substances; the sulfur recovery device 5 includes a sulfur desublimation device 51 and a dust remover 52, and the sulfur desublimation device 51 and the dust remover 52 are sequentially arranged along the gas flow direction.
The pretreatment apparatus 1 is used for pretreating blast furnace gas, and since the blast furnace gas contains a large amount of moisture, sulfur-containing compounds, and other impurities, and the moisture affects the adsorption effect of the adsorbent 33 on the sulfur compounds in the dry desulfurization, most of the moisture in the blast furnace gas can be removed by pretreating the blast furnace gas by the pretreatment apparatus 1.
The gas inlet of the hydrolysis device 2 is communicated with the gas outlet of the pretreatment device 1, and the hydrolysis device 2 is used for separating sulfur-containing substances in the blast furnace gas treated by the pretreatment device 1. The water content in the pretreated blast furnace gas is reduced, carbonyl sulfide accounts for more than 100mg/m3 of the sulfur content, and the carbonyl sulfide in the blast furnace gas is hydrolyzed into hydrogen sulfide by the hydrolysis device 2, so that the subsequent extraction of sulfur compounds is facilitated. The hydrolysis device 2 is provided with a hydrolysis agent, the hydrolysis agent can hydrolyze carbonyl sulfide into hydrogen sulfide, the hydrolysis agent can be a combination of a carrier and an active component, and the specific components can be as follows: the carrier is a hydrotalcite oxide of ZnNiAl, ZnNiFe, La-SnO2, CeO2 and NiAl, the active components are active carbon of Fe, Cu and Ce and one or a mixture of more of Al2O 3-K-coal-based active carbon, the carrier can also be gamma-Al 2O3 and TiO2, the active components are one or more of potassium oxide, ferric oxide and zirconium dioxide, and the additive is one or more of nitric acid, sesbania powder and polyvinyl alcohol. The adsorption device 3 is communicated with the hydrolysis device 2 and used for adsorbing hydrogen sulfide in the hydrolyzed blast furnace gas and replacing sulfur elements in the hydrogen sulfide into the adsorbent 33, so that clean gas meeting the national standard is discharged. The adsorbent can carry out effective adsorption reaction on the coal gas at the temperature of 20-80 ℃, the adsorption is more sufficient, and desorption reaction can be carried out at the temperature of 160-350 ℃ to desorb the sulfur compounds in the adsorbent into gas. The adsorbent 33 can be one or a mixture of several of metal oxide, modified zeolite material and modified activated carbon, wherein the metal oxide comprises ZnO and Fe2O3, and the modified zeolite material comprises Ca-LTA, Zn-LTA and Ca-X, Ce-Y, Cu-Y zeolite material.
Referring to fig. 2, in order to prolong the service life of the adsorbent 33 and further recycle the sulfur in the gas, a desorption back-blowing device 4 may be added at the gas outlet of the adsorption device 3, when the adsorbent reaches an adsorption saturation state, the adsorption flow channel of the blast furnace gas is closed, the bypass channel where the desorption back-blowing device 4 is located and the bypass channel of the sulfur recovery device are opened, the purified gas heated and pressurized by the desorption back-blowing device 4 is used to desorb the adsorbent 33, the sulfur element in the adsorbent is replaced, and the sulfur element is recovered by the sulfur recovery device, so that the sulfur content in the adsorbent is reduced, the adsorbent is separated from the adsorption saturation state, and the service life of the adsorbent is prolonged.
The desorption back-blowing device 4 comprises a pressurizing device 41 and a second heating device 42, the pressurizing device 41 can be a fan or the like, and the gas introduced into the desorption back-blowing device 4 is pressurized by the pressurizing device 41. The adsorption reaction is a reversible adsorption process, the reverse process is a desorption reaction, the temperature of the adsorbed clean gas is lower, and the temperature is reduced when the adsorbed clean gas is introduced into a bypass pipeline, so that the clean gas needs to be heated, and the efficiency of the desorption reaction is improved. The second heating device 42 is disposed behind the pressurizing device 41, and the pressurized clean gas is heated in the second heating device 42, and the second heating device 42 may be a conventional heating device such as a heating pipe or a heat exchange device. The second heating device 42 can effectively heat the purified gas to the temperature required by the desorption reaction, so as to increase the reaction rate of the purified gas in the desorption reaction and fully desorb the adsorbent.
In some preferred embodiments, the second heating device 42 includes a primary heating mechanism 421 and a secondary heating mechanism 422, the primary heating mechanism 421 includes a primary heating cavity 4211 and a tertiary heating pipe 4212, the tertiary heating pipe 4212 is spirally sleeved outside the primary heating cavity 4211, and a side wall of the tertiary heating pipe 4212 is attached to an outer wall of the primary heating cavity 4211, so as to facilitate heat conduction. Hot water or steam can be introduced into the tertiary heating pipe 4212 as a heat source to primarily heat the gas in the primary heating cavity 4211 to a first temperature. The first temperature is in the range of 80-160 deg.c.
The secondary heating mechanism 422 comprises a secondary heating cavity 4221 and an electric heater 4222, the electric heater 4222 extends into the secondary heating cavity 4221, the gas after primary heating is introduced into the secondary heating cavity 4221, and secondary heating is performed by the electric heater 4222 to reach a second temperature. The second temperature range is 160-350 ℃, the heated coal gas is introduced into the second gas inlet 37 of the adsorption device 3 from the gas outlet of the secondary heating mechanism 422, the coal gas and the adsorbent 33 undergo desorption reaction, the sulfur compounds in the adsorbent 33 are replaced by sulfur-containing gas, and the sulfur-containing gas is communicated to the sulfur recovery device 5 through the second gas outlet 35.
The sulfur recovery device 5 comprises a sulfur desublimation device 51 and a dust remover 52, the sulfur-containing gas flows into the sulfur desublimation device 51, the sulfur element in the sulfur-containing gas is cooled and separated out through the cooling and desublimation effects, sulfur dust is obtained, and then the sulfur dust is collected through the dust remover 52. The second cooling device 53 is sleeved outside the sulfur desublimation device 51, and the second cooling device 53 may be a second cooling pipe 531 or a second heat exchanger 532. The heat released during the desublimation of the sulfur dust is absorbed by the second cooling device 53, and the desublimation rate of the sulfur is improved. The dust separator 52 is a dust removing device that separates dust from flue gas. The dust collector 52 may be a particle layer dust collector, a bag type dust collector, an electric dust collector, or the like. In practical application, the low-purity sulfur dust obtained after treatment by the dust remover 52 can be collected for other processing technologies, so as to achieve the recovery and utilization of sulfur resources.
In some preferred embodiments, a purging pipeline may be disposed between the sulfur desublimation device 51 and the second air outlet 35, and the compressed inert gas is used to purge the inner wall of the sulfur desublimation device 51, so as to prevent sulfur dust from attaching to the inside of the sulfur desublimation device 51 and affecting the heat exchange effect; or, a visible window is additionally arranged on the side wall of the sulfur desublimation device 51 for observing the adhesion condition of the sulfur dust, and the sulfur dust is cleaned from the sulfur desublimation device 51 and the connecting pipeline at regular intervals.
The utility model discloses a set up desorption blowback device 4 and sulphur recovery unit 5 in blast furnace gas sulphur recovery system, heat the recycling to the coal gas after the absorption, when the adsorbent in the absorption is adsorbed and is saturated, reversely let in the absorption in the net coal gas, desorption adsorbent 33, separate out the sulfur compounds in adsorbent 33, realize recycling of adsorbent 33, it is solid to carry out the desublimation through sulphur recovery unit 5, retrieve through dust remover 52 at last, realize the recovery of sulfur compounds and sulphur.
Referring to fig. 3, in some embodiments, the sulfur recovery unit 5 further comprises: and an oxidizing mechanism 54 provided between the adsorption device 3 and the sulfur desublimation device 51, for oxidizing the sulfur compounds.
The oxidizing mechanism 54 is used for oxidizing sulfur compounds, the oxidizing agent 32 is filled in the oxidizing mechanism 54, the oxidizing agent 32 can be alumina as a carrier, fine iron oxide as an active component and a small amount of chromium oxide as a stabilizer, or can be activated carbon as a carrier, sodium oxide and zinc oxide as an accelerant, and the sulfur compounds are oxidized by the oxidizing agent 32 to generate gaseous sulfur simple substances. The air inlet of the oxidation mechanism 54 is connected with the second air outlet 35 of the adsorption device 3, the air outlet of the oxidation mechanism 54 is connected with the air inlet of the sulfur desublimation device 51, the hydrogen sulfide gas in the adsorption device 3 is further oxidized into elemental sulfur and water vapor by the oxidation mechanism 54, and then sulfur dust is desublimed out by the sulfur desublimation device 51. The sulfur compounds in the sulfur-containing coal gas are further oxidized by the oxidizing mechanism, the proportion of the sulfur compounds in the coal gas is reduced, the sulfur compounds in the coal gas reach the emission standard, and meanwhile, the content of gaseous sulfur simple substances in the coal gas is improved, which is beneficial to improving the desublimation efficiency in the subsequent desublimation process.
Referring to fig. 4, in some embodiments, the pretreatment device 1 includes a first cooling device 12, a first heating device 14, a gas dehumidifier 11, and a gas reheater 13; the gas inlet of the gas dehumidifier 11 is communicated with blast furnace gas to be treated, the first cooling device 12 is sleeved outside the gas dehumidifier 11 and is contacted with the outer wall of the gas dehumidifier 11, and the first cooling device 12 is used for cooling the blast furnace gas to be treated; the gas rewarming device 13 comprises a third gas inlet 131, the third gas inlet 131 is communicated with the gas outlet of the gas dehumidifier 11, and the gas outlet of the gas rewarming device 13 is communicated with the hydrolysis device 2; the first heating device 14 is arranged outside the gas rewarming device 13 and is in contact with the outer wall of the gas rewarming device 13, and is used for heating the dehumidified blast furnace gas.
The gas dehumidifier 11 can be a large tank structure capable of accommodating blast furnace gas, the inner surface of the gas dehumidifier 11 is made of chlorine-resistant stainless steel, the inner surface of the gas dehumidifier 11 can be subjected to an enamel plating process, and corrosion-resistant paint can be coated, so that the problem of corrosion of the inner surface of the gas dehumidifier 11 caused by too long contact between the inner surface of the gas dehumidifier 11 and the blast furnace gas is avoided, and the service life of the gas dehumidifier 11 is prolonged. The bottom of the gas dehumidifier 11 is provided with a water collecting tank, and the inner wall of the gas dehumidifier 11 is properly inclined within a preselected range close to the water collecting tank, so that water can flow to the water collecting tank conveniently.
In some preferred embodiments, a purging nozzle is further disposed at one end of the gas dehumidifier 11 close to the gas inlet, high-pressure nitrogen and high-pressure water are filled in the purging nozzle, the purging nozzle mixes the nitrogen and the water to spray atomized water vapor, the atomized water vapor is used for adsorbing large-particle dust, water-soluble compounds and the like in the blast furnace gas, and then the large-particle dust and part of the compounds in the blast furnace gas can be removed by dehumidifying through the gas dehumidifier 11. Optionally, a demister is additionally arranged inside one end of the gas outlet of the gas dehumidifier 11 to further remove water mist suspended in the gas and reduce the content of moisture in the gas.
The first cooling device 12 may be a cooling pipe, which is sleeved outside the gas dehumidifier 11. The first cooling device 12 is in contact with the outer wall of the gas dehumidifier 11 to facilitate heat conduction. The blast furnace gas passes through the gas dehumidifier 11, a large amount of water vapor contained in the high-temperature gas is condensed into water drops by reducing the temperature, and then the water is collected and discharged by the collector at the bottom, so that the water content in the high-temperature gas is reduced.
The gas rewarming device 13 can be a large tank structure, and the dehumidified blast furnace gas is introduced into the gas rewarming device. The first heating device 14 is sleeved outside the gas rewarming device 13, and the first heating device 14 is in contact with the outer wall of the gas rewarming device 13, so that heat conduction is facilitated.
In some preferred embodiments, the gas rewarming device 13 is provided with an insulating layer on the outside to prevent heat loss inside the gas rewarming device 13. The temperature of the blast furnace gas after dehumidification is low, which will affect the subsequent hydrolysis and desulfurization reaction, so the gas reheater 13 is needed to heat the blast furnace gas after dehumidification, which is convenient to improve the reaction efficiency of the subsequent hydrolysis reaction and adsorption reaction of the blast furnace gas.
In some embodiments, the gas reheater 13 further comprises a fourth gas inlet 132, and the outlet of the sulfur recovery unit 5 is in communication with the fourth gas inlet 132 of the gas reheater 13.
After the sulfur recovery device 5 recovers the sulfur dust, the obtained residual gas still has low-concentration sulfur compounds, and as a preferred scheme, the residual gas can be communicated to the gas rewarming device 13 through the fourth gas inlet 132, and then enters the desulfurization system again to participate in the subsequent reaction together with the newly introduced blast furnace gas. And the residual gas is communicated into the blast furnace gas through the fourth gas inlet, so that the problems of emission and environmental pollution caused by the residual gas mixed into the clean gas are avoided. And sulfur compounds in the residual coal gas can reenter the desulfurization reaction through the fourth gas inlet, so that the further recovery of the sulfur compounds is facilitated, and the recovery utilization rate of the sulfur compounds is improved.
In some embodiments, the first cooling device 12 includes a primary cooling mechanism 121 and a secondary cooling mechanism 122; the primary cooling mechanism 121 is arranged outside the gas dehumidifier 11 and located at one end close to the gas inlet of the gas dehumidifier 11, the primary cooling mechanism 121 is used for performing primary cooling on blast furnace gas to be treated, the primary cooling mechanism 121 is connected with a first cold source, and the first cold source is circulating cooling water; the secondary cooling mechanism 122 is arranged outside the gas dehumidifier 11 and at one end close to the gas outlet of the gas dehumidifier 11, the secondary cooling mechanism 122 is used for performing secondary cooling on blast furnace gas to be treated, the secondary cooling mechanism 122 is connected with a second cold source, and the second cold source is chilled water; the primary cooling mechanism 121 and the secondary cooling mechanism 122 are independent of each other and are not communicated with each other.
The primary cooling mechanism 121 is used for primary cooling of blast furnace gas, and the primary cooling mechanism 121 can be a cooling pipe and adopts circulating cooling water as a first cold source. The primary cooling mechanism 121 is sleeved outside the gas dehumidifier 11 and is provided with one end close to the gas inlet of the gas dehumidifier 11, so as to facilitate primary cooling treatment of the blast furnace gas. The secondary cooling mechanism 122 may also be a cooling pipe, and uses chilled water as a second cold source, and the secondary cooling mechanism 122 is sleeved outside the gas dehumidifier 11 and is provided at one end close to the gas outlet of the gas dehumidifier 11, so as to facilitate secondary cooling treatment of the blast furnace gas. The second-stage cooling mechanism 122 and the first-stage cooling mechanism 121 are arranged adjacently, and are mutually independent and not communicated, and the cold source of the first-stage cooling mechanism 121 and the cold source of the second-stage cooling mechanism 122 are mutually independent and cannot be mixed.
After the blast furnace gas is cooled in the second stage, the water vapor takes the dust as the inner core, is condensed into fog drops by cooling, absorbs hydrogen chloride gas, is attached to the inner surface of the gas dehumidifier 11 and is suspended in the blast furnace gas, forms large water drops after being further captured by the demister, and flows into a water collecting tank at the bottom of the gas dehumidifier 11, thereby realizing the dehumidification and water removal functions of the blast furnace gas and simultaneously discharging part of compound impurities mixed in the blast furnace gas.
In some embodiments, the first heating device 14 is a heating pipe, and the heating pipe is spirally sleeved outside the gas rewarming device 13; alternatively, the first heating device 14 is a first heat exchanger 143.
The first heating device 14 may be a heating pipe, which is sleeved outside the gas rewarming device 13 and attached to the outer surface of the gas rewarming device 13. Optionally, a heat insulation layer and a heat insulation layer may be covered outside the heating pipe and the gas reheater 13, so that heat loss of the heating pipe and the gas reheater 13 is reduced, and heating efficiency of the gas reheater 13 is improved.
Referring to fig. 5, the first heating device 14 can also be a first heat exchanger, and the first heat exchanger 143 is a device for transferring heat from a hot fluid to a cold fluid to meet the specified process requirements, and is an industrial application of convective heat transfer and heat transfer. The first heat exchanger 143 in the blast furnace gas is more widely applied, and can utilize surplus low-grade heat sources in iron and steel enterprises or heat energy in other processing technologies to heat the blast furnace gas, thereby saving energy and protecting environment. For example, the first heat exchanger 143 may be a tubular heat exchanger, and the heating end of the first heat exchanger 143 is disposed outside the gas rewarming device 13, near one side of the gas rewarming device 13, but is not attached to the gas rewarming device 13; the input end of the curved pipeline is communicated with the gas rewarming device 13 and is close to the gas inlet of the gas rewarming device 13, the curved part covers the heating end of the first heat exchanger 143, the output end of the curved pipeline is communicated with the gas rewarming device 13 and is close to the gas outlet of the gas rewarming device 13, the blast furnace gas is communicated into the curved pipeline from the gas rewarming device 13, and the blast furnace gas returns to the gas rewarming device 13 after being heated at the heating end of the first heat exchanger 143 at a slow speed, so that the heating of the blast furnace gas is realized.
In some embodiments, the heating tube includes a primary heating tube 141 and a secondary heating tube 142; the primary heating pipe 141 is arranged outside the gas rewarming device 13 and is positioned at one end close to the gas inlet of the gas rewarming device 13, and is used for performing primary heating on the dehumidified blast furnace gas, and the primary heating pipe 141 is connected with a first heat source which is hot water; the secondary heating pipe 142 is arranged outside the gas rewarming device 13 and is positioned at one end close to the gas outlet of the gas rewarming device 13, the secondary heating pipe 142 is used for carrying out secondary heating on blast furnace gas to be treated, the secondary heating pipe 142 is connected with a second heat source, and the second heat source is hot steam; the primary heating pipe 141 and the secondary heating pipe 142 are independent from each other and are not communicated with each other.
The primary heating pipe 141 is used for primary heating of the dehumidified blast furnace gas, the primary heating pipe 141 is connected with a first heat source, optionally, the first heat source can be hot water or a surplus low-grade heat source in a steel enterprise, and recycling of surplus heat sources is achieved. The secondary heating pipe 142 is used for carrying out secondary heating on blast furnace gas to be treated, and the secondary heating pipe 142 is connected with a second heat source which is hot steam; the coal gas is heated to more than 100 ℃ through steam, so that the subsequent hydrolysis reaction and adsorption reaction of the coal gas are facilitated. The primary heating pipe 141 and the secondary heating pipe 142 are independent from each other and are not communicated with each other, and the heat source of the primary heating pipe 141 and the heat source of the secondary heating pipe 142 are independent from each other and cannot be mixed.
In some embodiments, the pretreatment device 1 further comprises a dechlorination device 15, an air inlet of the dechlorination device 15 is connected with an air outlet of the gas rewarming device 13, an air outlet of the dechlorination device 15 is connected with an air inlet of the hydrolysis device 2, and the dechlorination device 15 is used for removing chlorine-containing impurities in the rewarmed gas.
Hydrogen chloride gas contained in the gas corrodes the hydrolytic agent and the adsorbent 33, and hydrogen chloride can be partially removed during the gas dehumidification by utilizing the characteristic that hydrogen chloride is dissolved in water in the gas dehumidification link in the pretreatment device 1, and a small amount of hydrogen chloride gas also remains in the dehumidified gas. Therefore, the dechlorinating device 15 is additionally arranged in the pretreatment device 1, so that the residual chlorine-containing impurities in the coal gas can be removed.
The dechlorination device 15 is arranged at the air outlet of the coal gas rewarming device 13, and the air outlet of the dechlorination device 15 is connected with the air inlet of the hydrolysis device 2. The dechlorination device 15 contains dechlorination agent, and is used as security sacrificial agent to prevent the rear end hydrolytic agent and the adsorbent 33 from losing efficacy when the concentration of hydrogen chloride in the gas is high and the cold quantity of the cold source is insufficient.
In some embodiments, the hydrolysis apparatus 2 comprises a plurality of hydrolysis towers 21, and the adsorption apparatus 3 comprises a plurality of adsorption towers 31; the air outlet of each hydrolysis tower 21 is correspondingly communicated with the air inlet of one adsorption tower 31, the air inlets of all the hydrolysis towers 21 are communicated with the air outlet of the same pretreatment device 1, and the first air outlets 36 of all the adsorption towers 31 are communicated with the air inlet of the same desorption back flushing device 4.
The hydrolysis tower 21 is a specific structure for performing a gas hydrolysis reaction, and the hydrolysis tower 21 contains a hydrolyzing agent therein, and hydrolyzes carbonyl sulfide in the gas into gas such as hydrogen sulfide by sufficiently contacting the gas. Since the hydrolysis reaction requires a certain time, in order to improve the hydrolysis efficiency, a plurality of hydrolysis towers 21 may be provided, and the pretreated coal gas is introduced into the plurality of hydrolysis towers 21 to perform the hydrolysis reaction.
The adsorption tower 31 is a specific structure for carrying out a gas adsorption reaction, an adsorbent 33 is arranged in the adsorption tower 31, sulfur elements in the gas are adsorbed in the adsorbent 33 through full contact with the gas, and clean gas meeting the emission standard is discharged. Since the adsorption reaction requires a certain time, in order to improve the adsorption efficiency, a plurality of adsorption towers 31 may be provided, and the hydrolyzed gas is introduced into the plurality of adsorption towers 31 to perform the adsorption reaction. Alternatively, the gas outlet of one hydrolysis tower 21 communicates with the first gas inlet 34 of one adsorption tower 31. The adsorbed coal gas is clean coal gas, meets the emission standard and can be directly emitted into the atmosphere.
Referring to fig. 6, in some embodiments, the adsorption device 3 further includes an adsorption body, the adsorption body has a cavity therein, the cavity is provided with an oxidant 32 and an adsorbent 33, the oxidant 32 and the adsorbent 33 are disposed in different positions and areas, the oxidant 32 may be disposed in a predetermined area near the second air outlet 35, and the oxidant 32 is used for oxidizing the sulfur compound into elemental sulfur. Since the adsorbent 33 has a larger adsorption capacity for elemental sulfur than for sulfur compounds, the oxidant 32 may also be disposed in a predetermined region near the first gas inlet 34 for increasing the adsorption efficiency of sulfur in the gas.
The absorption body is filled with an oxidant 32 and an absorbent 33, and the working principle is as follows: the blast furnace gas enters the adsorption body from the first gas inlet 34 after hydrolysis, and is subjected to adsorption reaction with the adsorbent 33 in the adsorption body, the sulfur element is adsorbed in the adsorbent 33, and the clean gas flows out from the first gas outlet 36. After the adsorbent 33 reaches a saturated state, the first air inlet 34 and the first air outlet 36 are closed, the second air inlet 37 and the second air outlet 35 are opened, the air outlet of the desorption back-blowing device 4 is connected with the second air inlet 37, the pressurized and heated clean gas enters the adsorbent body and is subjected to desorption reaction with the adsorbent 33 in the adsorbent body, the adsorption content of sulfur compounds in the adsorbent 33 is reduced, sulfur elements are changed into hydrogen sulfide gas, the hydrogen sulfide gas is subjected to oxidation reaction with the oxidant 32, gaseous sulfur simple substances are generated through oxidation reaction, and the gaseous sulfur simple substances flow out from the second air outlet 35.
The adsorbent 33 is used for adsorbing the sulfur compounds, and the oxidant 32 is used for oxidizing the sulfur compounds, which affect each other, so that the adsorbent 33 and the oxidant 32 cannot be arranged in an overlapping manner, and the oxidant 32 is arranged in a predetermined area range at the second gas outlet 35, and only the gas entering the second gas outlet 35 needs to be subjected to an oxidation reaction.
According to the technical scheme, the desorption back-blowing device and the sulfur recovery device are additionally arranged, when the adsorbent reaches a saturated state, a channel related to the adsorption reaction of the blast furnace gas is closed, a bypass channel required by the desorption reaction is opened, the desorption back-blowing device pressurizes and heats the clean gas to the temperature required by the desorption reaction, then the clean gas is introduced into the adsorption device, the adsorbent is subjected to desorption treatment, the sulfur element in the adsorbent is replaced, and the sulfur element is refined and desublimated through the sulfur recovery device to obtain sulfur dust for recovery. The utilization of sulfur resources and the recycling effect of the adsorbent are realized, the service life of the adsorbent is prolonged, and meanwhile, sulfur in blast furnace gas is collected to obtain low-concentration sulfur dust for related industrial utilization, so that the sulfur content in the gas is effectively reduced, and the method is environment-friendly and efficient.
Finally, it should be noted that, although the above embodiments have been described in the text and drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical solutions which are generated by replacing or modifying the equivalent structure or the equivalent flow according to the contents described in the text and the drawings of the present application, and which are directly or indirectly implemented in other related technical fields, are included in the scope of protection of the present application.
Claims (10)
1. A blast furnace gas sulfur recovery system, comprising:
the gas inlet of the pretreatment device is communicated with the gas phase of the blast furnace gas to be treated, and the pretreatment device is used for cooling and dewatering the blast furnace gas to be treated;
the gas inlet of the hydrolysis device is communicated with the gas outlet of the pretreatment device, and the hydrolysis device is used for separating sulfur-containing substances in the blast furnace gas treated by the pretreatment device;
the adsorption device comprises a first air inlet, a second air inlet, a first air outlet and a second air outlet, the first air inlet of the adsorption device is communicated with the air outlet of the hydrolysis device, and the adsorption device is used for performing desulfurization treatment on the coal gas hydrolyzed by the hydrolysis device;
the gas inlet of the desorption back-blowing device is communicated with the first gas outlet of the adsorption device, the gas outlet of the desorption back-blowing device is communicated with the second gas inlet of the adsorption device, and the desorption back-blowing device is used for heating desulfurized coal gas and then reversely introducing the heated desulfurized coal gas into the adsorption device for desorption reaction;
the desorption back-blowing device comprises a second heating device, the second heating device comprises a primary heating mechanism, the primary heating mechanism comprises a primary heating cavity and a tertiary heating pipe, and the tertiary heating pipe is spirally sleeved outside the primary heating cavity;
the gas inlet of the sulfur recovery device is communicated with the second gas outlet of the adsorption device, and the sulfur recovery device is used for replacing and recovering elemental sulfur from the desorption gas;
the sulfur recovery device comprises a sulfur desublimation device and a dust remover, and the sulfur desublimation device and the dust remover are sequentially arranged along the gas flowing direction;
the sulfur recovery device also comprises a purging pipeline, and the purging pipeline is arranged between the sulfur desublimation device and the dust remover.
2. The blast furnace gas sulfur recovery system of claim 1, wherein the sulfur recovery unit further comprises:
and the oxidation mechanism is arranged between the adsorption device and the sulfur desublimation device and is used for oxidizing sulfur compounds.
3. The blast furnace gas sulfur recovery system of claim 1 or 2, wherein the pretreatment device comprises a first cooling device, a first heating device, a gas dehumidifier, and a gas rewater;
the gas inlet of the gas dehumidifier is communicated with the blast furnace gas to be treated, the first cooling device is sleeved outside the gas dehumidifier and is in contact with the outer wall of the gas dehumidifier, and the first cooling device is used for cooling the blast furnace gas to be treated;
the gas rewarming device comprises a third gas inlet, the third gas inlet is communicated with the gas outlet of the gas dehumidifier, and the gas outlet of the gas rewarming device is communicated with the hydrolysis device;
the first heating device is arranged outside the gas rewarming device, is in contact with the outer wall of the gas rewarming device and is used for heating the dehumidified blast furnace gas.
4. The blast furnace gas sulfur recovery system of claim 3, wherein the gas rewarming device further comprises a fourth gas inlet, and the outlet of the sulfur recovery unit is in communication with the fourth gas inlet of the gas rewarming device.
5. The blast furnace gas sulfur recovery system of claim 3, wherein the first cooling device comprises a primary cooling mechanism and a secondary cooling mechanism;
the primary cooling mechanism is arranged outside the gas dehumidifier and positioned at one end close to the gas inlet of the gas dehumidifier, and is used for carrying out primary cooling on blast furnace gas to be treated;
the secondary cooling mechanism is arranged outside the gas dehumidifier and positioned at one end close to the gas outlet of the gas dehumidifier, and is used for carrying out secondary cooling on blast furnace gas to be treated, and is connected with a second cold source which is chilled water;
the first-stage cooling mechanism and the second-stage cooling mechanism are mutually independent and are not communicated with each other.
6. The blast furnace gas sulfur recovery system of claim 3,
the first heating device is a heating pipe, and the heating pipe is spirally sleeved outside the gas rewarming device;
or, the first heating device is a first heat exchanger.
7. The blast furnace gas sulfur recovery system of claim 6, wherein the heating tubes comprise primary heating tubes and secondary heating tubes;
the primary heating pipe is arranged outside the gas rewarming device and positioned at one end close to the gas inlet of the gas rewarming device and used for performing primary heating on the dehumidified blast furnace gas, and the primary heating pipe is connected with a first heat source which is hot water;
the secondary heating pipe is arranged outside the gas rewarming device and is positioned at one end close to the gas outlet of the gas rewarming device, the secondary heating pipe is used for carrying out secondary heating on blast furnace gas to be treated, the secondary heating pipe is connected with a second heat source, and the second heat source is hot steam;
the primary heating pipe and the secondary heating pipe are mutually independent and are not communicated with each other.
8. The blast furnace gas sulfur recovery system of claim 3, wherein the pretreatment device further comprises a dechlorination device, an air inlet of the dechlorination device is connected with an air outlet of the gas rewarming device, an air outlet of the dechlorination device is connected with an air inlet of the hydrolysis device, and the dechlorination device is used for removing chlorine-containing impurities in the rewarmed gas.
9. The blast furnace gas sulfur recovery system of claim 1, wherein the hydrolysis apparatus comprises a plurality of hydrolysis towers, and the adsorption apparatus comprises a plurality of adsorption towers;
the gas outlet of each hydrolysis tower is correspondingly communicated with the gas inlet of one adsorption tower, the gas inlets of all the hydrolysis towers are communicated with the gas outlet of the same pretreatment device, and the first gas outlets of all the adsorption towers are communicated with the gas inlet of the same desorption back flushing device.
10. The blast furnace gas sulfur recovery system of claim 1, wherein the adsorption device further comprises an adsorption body, a cavity is formed in the adsorption body, an oxidizing agent and an adsorbent are arranged in the cavity, the oxidizing agent and the adsorbent are arranged in a position area which is not overlapped with each other, and the oxidizing agent is arranged in a predetermined area range of the second gas outlet.
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