CN113926293B - Dry desulfurization device and desulfurization method - Google Patents
Dry desulfurization device and desulfurization method Download PDFInfo
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- CN113926293B CN113926293B CN202010667782.XA CN202010667782A CN113926293B CN 113926293 B CN113926293 B CN 113926293B CN 202010667782 A CN202010667782 A CN 202010667782A CN 113926293 B CN113926293 B CN 113926293B
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 300
- 230000023556 desulfurization Effects 0.000 title claims abstract description 300
- 238000000034 method Methods 0.000 title claims abstract description 97
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 211
- 239000007789 gas Substances 0.000 claims abstract description 176
- 239000000112 cooling gas Substances 0.000 claims abstract description 93
- 238000010926 purge Methods 0.000 claims abstract description 60
- 238000012546 transfer Methods 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims description 94
- 230000008569 process Effects 0.000 claims description 68
- 239000002994 raw material Substances 0.000 claims description 16
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 14
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a dry desulfurization device and a dry desulfurization method, and belongs to the technical field of desulfurization. In the device, the main air inlet line is communicated with the first and second sub air inlet lines; the first and second sub-inlet lines are also in communication with the first and second desulfurizing towers, respectively; the first and second transfer pipeline inlets are respectively communicated with the first and second desulfurizing tower outlets, and the first and second transfer pipeline outlets are respectively communicated with the second and first desulfurizing tower inlets; the inlets of the first sub-purified gas pipeline and the second sub-purified gas pipeline are respectively communicated with the first switching pipeline and the second switching pipeline, and the outlets of the first sub-purified gas pipeline and the second sub-purified gas pipeline are communicated with the main purified gas pipeline; the cooling gas pipeline is communicated with the main air inlet pipeline; the first air inlet valve and the second air inlet valve are respectively positioned on the first sub-air inlet pipe line and the second sub-air inlet pipe line; the first and second transfer valves are respectively positioned on the first and second transfer pipelines; the first and second purge gas valves are located on the first and second sub-purge gas lines, respectively; the temperature sensor is arranged on the first desulfurizing tower and the second desulfurizing tower and is electrically connected with a cooling gas control valve positioned on the cooling gas pipeline.
Description
Technical Field
The invention relates to the technical field of desulfurization, in particular to a dry desulfurization device and a desulfurization method.
Background
The currently common desulfurization methods include the following three types: dry desulfurization, wet desulfurization, and biological desulfurization. Wherein, the dry desulfurization is to remove H 2 S in the gas by physical and chemical adsorption by using solid particle desulfurizing agents such as ferric oxide, active carbon and the like. And is especially suitable for desulfurizing natural gas and marsh gas with low sulfur-diving amount, low hydrogen sulfide concentration (below 10g/m 3) and high pressure (above 1 MPa).
For low pressure (near normal pressure) and high hydrogen sulfide concentration (more than 100g/m 3), particularly oxygen-containing working conditions, heat is severely released in the desulfurization process, and if the current dry desulfurization process is directly adopted, heat accumulation is extremely easy to cause the desulfurizer bed layer to exceed Wen Ziran.
In carrying out the invention, the present inventors have found that there are at least the following problems in the prior art:
in the related art, no effective dry desulfurization measures have been found for desulfurization of high hydrogen sulfide concentration and oxygen-containing mixed gas.
Disclosure of Invention
In view of the above, the present invention provides a dry desulfurization apparatus and a desulfurization method, which can solve the above-mentioned technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, there is provided a dry desulfurization apparatus including: the system comprises a first desulfurizing tower, a second desulfurizing tower, a main air inlet pipeline, a first sub air inlet pipeline, a second sub air inlet pipeline, a first switching pipeline, a second switching pipeline, a main purified gas pipeline, a first sub purified gas pipeline, a second sub purified gas pipeline, a cooling gas pipeline, a first air inlet valve, a second air inlet valve, a first switching valve, a second switching valve, a first purified gas valve, a second purified gas valve, a cooling gas control valve and a temperature sensor;
the outlet end of the main air inlet pipeline is simultaneously communicated with the inlet ends of the first sub air inlet pipeline and the second sub air inlet pipeline;
the outlet end of the first sub air inlet pipeline is communicated with the air inlet of the first desulfurizing tower, and the outlet end of the second sub air inlet pipeline is communicated with the air inlet of the second desulfurizing tower;
the inlet end of the first transfer pipeline is communicated with the air outlet of the first desulfurizing tower, and the outlet end of the first transfer pipeline is communicated with the air inlet of the second desulfurizing tower;
The inlet end of the second transfer pipeline is communicated with the air outlet of the second desulfurizing tower, and the outlet end of the second transfer pipeline is communicated with the air inlet of the first desulfurizing tower;
the inlet end of the first sub-purified gas pipeline is communicated with the first transfer pipeline, and the outlet end of the first sub-purified gas pipeline is communicated with the inlet end of the main purified gas pipeline;
the inlet end of the second sub-purifying gas pipeline is communicated with the second switching pipeline, and the outlet end of the second sub-purifying gas pipeline is communicated with the inlet end of the main purifying gas pipeline;
The outlet end of the cooling gas pipeline is communicated with the main air inlet pipeline;
the first air inlet valve is positioned on the first sub-air inlet pipe line;
the second air inlet valve is positioned on the second sub-air inlet pipe line;
the first transfer valve is positioned on the first transfer line and downstream of the inlet end of the first sub-purge gas line;
the second transfer valve is positioned on the second transfer pipeline and is positioned at the downstream of the inlet end of the second sub-purified gas pipeline;
The first purifying air valve is positioned on the first sub purifying air pipeline;
the second purifying air valve is positioned on the second sub purifying air pipeline;
The temperature sensors are respectively arranged on the first desulfurization tower and the second desulfurization tower and are used for measuring the temperature of the desulfurizing agent beds in the first desulfurization tower and the second desulfurization tower;
The cooling gas control valve is positioned on the cooling gas pipeline and is electrically connected with the temperature sensor and used for adjusting the opening according to temperature information measured by the temperature sensor.
In one possible implementation manner, the dry desulfurization device further includes: a cooling gas check valve;
the cooling gas check valve is located on the cooling gas line and downstream of the cooling gas control valve.
In one possible implementation manner, the dry desulfurization device further includes: a first conduit flame arrester and a second conduit flame arrester;
The first pipeline flame arrestor is positioned on the main air inlet pipeline;
the second conduit flame arrestor is located on the primary purge gas line.
In one possible implementation manner, the dry desulfurization device further includes: a main blow-down pipeline, a first sub-blow-down pipeline, a second sub-blow-down pipeline and a blow-down valve;
the inlet end of the first sub-blowdown pipeline is communicated with a blowdown outlet of the first desulfurizing tower;
the inlet end of the second sub-blowdown pipeline is communicated with a blowdown outlet of the second desulfurizing tower;
The outlet ends of the first sub-blow-down pipeline and the second sub-blow-down pipeline are communicated with the inlet end of the main blow-down pipeline;
the blowdown valve is located on the main blowdown pipeline, the first sub blowdown pipeline and the second sub blowdown pipeline respectively.
In another aspect, a dry desulfurization method is provided that employs any of the dry desulfurization devices described above.
In one possible implementation, the dry desulfurization method includes: a first desulfurization process performed by connecting the first desulfurization tower in series with the second desulfurization tower;
the first desulfurization process includes: opening the first air inlet valve, the first transfer valve and the second purified air valve, and closing the rest valves at the same time;
The raw material gas to be desulfurized sequentially enters a first desulfurizing tower through a main air inlet pipeline and a first sub air inlet pipeline, and dry desulfurization operation is carried out to obtain intermediate purified gas;
the intermediate purified gas is discharged from the first desulfurizing tower, enters the second desulfurizing tower through the first transfer pipeline, and is subjected to dry desulfurizing operation again to obtain terminal purified gas;
The terminal purified gas is discharged from the second desulfurizing tower and sequentially discharged through a second sub purified gas pipeline and a main purified gas pipeline;
When the first desulfurization process is carried out, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of a desulfurizing agent bed layer in the first desulfurization tower and the second desulfurization tower respectively, and the opening degree of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent bed layer, so that the flow rate of cooling gas entering a main air inlet pipeline is controlled, and the temperature of the desulfurizing agent bed layer is kept within a set range.
In one possible implementation, the dry desulfurization method includes: a second desulfurization process performed separately in the second desulfurization tower;
the second desulfurization process includes: opening a second air inlet valve and a second purifying air valve, and closing other valves at the same time;
the raw material gas to be desulfurized enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
The terminal purified gas is discharged from the second desulfurizing tower and sequentially discharged through a second sub purified gas pipeline and a main purified gas pipeline;
And when the second desulfurization process is carried out, detecting the temperature of a desulfurizing agent bed layer in the second desulfurization tower by using a temperature sensor arranged on the second desulfurization tower, controlling the opening of the cooling gas control valve according to the temperature of the desulfurizing agent bed layer, and further controlling the flow rate of cooling gas entering a main air inlet pipeline to keep the temperature of the desulfurizing agent bed layer within a set range.
In one possible implementation, the dry desulfurization method includes: a third desulfurization process performed by the first desulfurization tower connected in series with the second desulfurization tower;
The third desulfurization process includes: opening a second air inlet valve, a second switching valve and a first purifying air valve, and closing other valves at the same time;
The raw material gas to be desulfurized sequentially enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline, and dry desulfurization operation is carried out to obtain intermediate purified gas;
The intermediate purified gas is discharged from the second desulfurizing tower, enters the first desulfurizing tower through a second switching pipeline, and is subjected to dry desulfurizing operation again to obtain terminal purified gas;
The terminal purified gas is discharged from the first desulfurizing tower and sequentially discharged through a first sub purified gas pipeline and a main purified gas pipeline;
And when the third desulfurization process is carried out, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of the desulfurizing agent beds in the first desulfurization tower and the second desulfurization tower respectively, and the opening degree of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent beds, so that the flow rate of cooling gas entering the main air inlet pipeline is controlled, and the temperature of the desulfurizing agent beds is kept within a set range.
In one possible implementation, the dry desulfurization method includes: a fourth desulfurization process performed by the first desulfurization tower alone;
The fourth desulfurization process includes: opening a first air inlet valve and a first purifying air valve, and closing other valves at the same time;
The raw material gas to be desulfurized enters a first desulfurizing tower through a main air inlet pipeline and a first sub air inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
The terminal purified gas is discharged from the first desulfurizing tower and sequentially discharged through a first sub purified gas pipeline and a main purified gas pipeline;
And when the fourth desulfurization process is performed, detecting the temperature of a desulfurizing agent bed layer in the first desulfurization tower by using a temperature sensor arranged on the first desulfurization tower, controlling the opening of the cooling gas control valve according to the temperature of the desulfurizing agent bed layer, and further controlling the flow rate of cooling gas entering a main air inlet pipeline to keep the temperature of the desulfurizing agent bed layer within a set range.
In one possible implementation, the cooling gas is an inert gas and the pressure of the cooling gas is higher than the pressure of the feed gas.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
According to the dry desulfurization device provided by the embodiment of the invention, the first desulfurization tower and the second desulfurization tower are arranged, the first desulfurization tower can be connected in series with the second desulfurization tower to carry out desulfurization operation under the control action of each valve, the second desulfurization tower can also be connected in series with the first desulfurization tower to carry out desulfurization operation, and the first desulfurization tower or the second desulfurization tower can also carry out desulfurization operation independently. Meanwhile, when desulfurization is carried out, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of the desulfurizing agent beds in the first desulfurization tower and the second desulfurization tower respectively, and the opening of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent beds, so that the flow rate of cooling gas entering the main air inlet pipeline is controlled, and the temperature of the desulfurizing agent beds is kept within a set range. By the arrangement, the dry desulfurization device provided by the embodiment of the invention is suitable for low-pressure (near normal pressure) high-hydrogen sulfide concentration (more than 100g/m 3) and desulfurization of natural gas and methane under the working condition of oxygen. The heat released in the desulfurization process is absorbed by the cooling gas, so that the temperature can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an exemplary dry desulfurization apparatus according to an embodiment of the present invention.
Reference numerals denote:
11-a first desulfurizing tower, 12-a second desulfurizing tower,
21-A main intake line, 22-a first sub intake line, 23-a second sub intake line,
24-A first air inlet valve, 25-a second air inlet valve,
31-First transfer line, 32-second transfer line, 33-first transfer valve, 34-second transfer valve,
41-Main purge gas line, 42-first sub-purge gas line, 43-second sub-purge gas line,
44-A first purge valve, 45-a second purge valve,
51-Cooling gas line, 52-cooling gas control valve, 53-cooling gas check valve, 54-temperature sensor,
61-First conduit flame arrester, 62-second conduit flame arrester,
71-A main blow-down pipeline, 72-a first sub blow-down pipeline, 73-a second sub blow-down pipeline and 74-a blow-down valve.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides a dry desulfurization apparatus, as shown in fig. 1, including: the first desulfurization tower 11, the second desulfurization tower 12, the main intake line 21, the first sub intake line 22, the second sub intake line 23, the first switching line 31, the second switching line 32, the main purge gas line 41, the first sub purge gas line 42, the second sub purge gas line 43, the cooling gas line 51, the first intake valve 24, the second intake valve 25, the first switching valve 33, the second switching valve 34, the first purge gas valve 44, the second purge gas valve 45, the cooling gas control valve 52, the temperature sensor 53.
Wherein the outlet end of the main intake line 21 communicates with the inlet ends of both the first sub intake line 22 and the second sub intake line 23;
the outlet end of the first sub air inlet line 22 is communicated with the air inlet of the first desulfurizing tower 11, and the outlet end of the second sub air inlet line 23 is communicated with the air inlet of the second desulfurizing tower 12;
The inlet end of the first transfer pipeline 31 is communicated with the air outlet of the first desulfurizing tower 11, and the outlet end of the first transfer pipeline 31 is communicated with the air inlet of the second desulfurizing tower 12;
The inlet end of the second switching pipeline 32 is communicated with the air outlet of the second desulfurizing tower 12, and the outlet end of the second switching pipeline 32 is communicated with the air inlet of the first desulfurizing tower 11;
the inlet end of the first sub purge gas line 42 is communicated with the first transfer line 31, and the outlet end of the first sub purge gas line 42 is communicated with the inlet end of the main purge gas line 41;
the inlet end of the second sub purge gas line 43 is communicated with the second transfer line 32, and the outlet end of the second sub purge gas line 43 is communicated with the inlet end of the main purge gas line 41;
the outlet end of the cooling gas line 51 communicates with the main intake line 21;
A first inlet valve 24 is located on the first sub-inlet line 22;
a second inlet valve 25 is located on the second sub-inlet line 23;
the first transfer valve 33 is located on the first transfer line 31 downstream of the inlet end of the first sub purge gas line 42;
the second transfer valve 34 is located on the second transfer line 32 downstream of the inlet end of the second sub purge line 43;
a first purge gas valve 44 is located on the first sub-purge gas line 42;
a second purge gas valve 45 is located on the second sub-purge gas line 43;
Temperature sensors 53 are provided on the first desulfurization tower 11 and the second desulfurization tower 12, respectively, for measuring the desulfurizing agent bed temperatures inside the first desulfurization tower 11 and the second desulfurization tower 12;
The cooling gas control valve 52 is located on the cooling gas pipeline 51, and the cooling gas control valve 52 is electrically connected with the temperature sensor 53, and is used for adjusting the opening according to the temperature information measured by the temperature sensor 53.
According to the dry desulfurization device provided by the embodiment of the invention, the first desulfurization tower 11 and the second desulfurization tower 12 are arranged, so that the first desulfurization tower 11 can be connected with the second desulfurization tower 12 in series to perform desulfurization operation under the control action of each valve, the second desulfurization tower 12 can also be connected with the first desulfurization tower 11 in series to perform desulfurization operation, and the first desulfurization tower 11 or the second desulfurization tower 12 can also perform desulfurization operation independently. Meanwhile, when desulfurization is performed, the temperature sensors 54 arranged on the first desulfurization tower 11 and the second desulfurization tower 12 are used for detecting the temperature of the desulfurizing agent beds in the first desulfurization tower 11 and the second desulfurization tower 12 respectively, and the opening degree of the cooling gas control valve 52 is controlled according to the temperature of the desulfurizing agent beds, so that the flow rate of the cooling gas entering the main air inlet pipeline 21 is controlled, and the temperature of the desulfurizing agent beds is kept within a set range. By the arrangement, the dry desulfurization device provided by the embodiment of the invention is suitable for low-pressure (near normal pressure) high-hydrogen sulfide concentration (more than 100g/m 3) and desulfurization of natural gas and methane under the working condition of oxygen. The heat released in the desulfurization process is absorbed by the cooling gas, so that the temperature can be effectively reduced.
In the embodiment of the present invention, the first desulfurizing tower 11 and the second desulfurizing tower 12 are all dry desulfurizing towers common in the art, a desulfurizing agent bed is arranged in the desulfurizing tower, and the desulfurizing agent used can be ferric oxide desulfurizing agent.
Further, as shown in fig. 1, the dry desulfurization device provided in the embodiment of the present invention further includes: a cooling gas check valve 53; wherein a cooling gas check valve 53 is located on the cooling gas line 51 downstream of the cooling gas control valve 52.
By using the cooling gas check valve 53 to ensure that the cooling gas smoothly enters the inside of the first desulfurization tower 11 and/or the second desulfurization tower 12, an effective temperature reduction of the desulfurizing agent bed therein is achieved.
Further, as shown in fig. 1, the dry desulfurization device provided in the embodiment of the present invention further includes: a first conduit flame arrester 61 and a second conduit flame arrester 62; wherein the first conduit flame arrestor 61 is located on the main intake line 21; a second conduit flame arrestor 62 is located on the main purge gas line 41.
By providing the first pipe flame arrestor 61 and the second pipe flame arrestor 62 as described above, it is possible to prevent the spread of flames that may be generated, and to improve the safety of the desulfurization process.
Further, as shown in fig. 1, the dry desulfurization device provided in the embodiment of the present invention further includes: a main drain line 71, a first sub drain line 72, a second sub drain line 73, and a drain valve 74;
Wherein, the inlet end of the first sub-blowdown line 72 is communicated with the blowdown port of the first desulfurizing tower 11;
the inlet end of the second sub-blowdown line 73 is communicated with a blowdown outlet of the second desulfurizing tower 12;
The outlet ends of the first sub-drain line 72 and the second sub-drain line 73 are both in communication with the inlet end of the main drain line 71;
a drain valve 74 is located on the main drain line 71, the first sub drain line 72 and the second sub drain line 73, respectively.
Through the arrangement of the main sewage drain pipeline 71, the first sub sewage drain pipeline 72, the second sub sewage drain pipeline 73 and the sewage drain valve 74, sewage discharged from the bottoms of the first desulfurization tower 11 and the second desulfurization tower 12 can be timely drained, and the use safety and the service life of the desulfurization device are improved.
The dry desulfurization device provided by the embodiment of the invention has four working modes, which are respectively as follows:
First mode: the first desulfurization process is performed by the first desulfurization tower 11 connected in series with the second desulfurization tower 12.
The first desulfurization process includes: the first intake valve 24, the first changeover valve 33 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized sequentially enters the first desulfurizing tower 11 through the main air inlet pipeline 21 and the first sub air inlet pipeline 22, and is subjected to dry desulfurization operation to obtain intermediate purified gas. (in the process, the raw material gas and the desulfurizing agent are in reverse contact reaction to remove most of hydrogen sulfide in the raw material gas, so as to obtain intermediate purified gas).
The intermediate purified gas is discharged from the first desulfurization tower 11 and enters the second desulfurization tower 12 through the first transfer line 31, and the dry desulfurization operation is performed again to obtain a terminal purified gas. In the embodiment of the invention, the terminal purified gas can meet the emission standard requirement.
The terminal purge gas is discharged from the second desulfurization tower 12, and is discharged through the second sub-purge gas line 43 and the main purge gas line 41 in this order.
In the first desulfurization process, the temperature sensors 54 provided in the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperature of the desulfurizing agent bed in the first desulfurization tower 11 and the second desulfurization tower 12, respectively, and the opening of the cooling gas control valve 52 is controlled according to the desulfurizing agent bed temperature, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the desulfurizing agent bed temperature is maintained within a set range.
In the embodiment of the present invention, one or more temperature sensors 54 are disposed on each of the first desulfurizing tower 11 and the second desulfurizing tower 12, and the temperature measuring probe of the temperature sensor 54 is located at the desulfurizing agent bed inside the desulfurizing tower, so that the temperature of the desulfurizing agent bed can be detected (when a plurality of temperature sensors 54 are used, the detected highest temperature is the basis). If the highest temperature of the desulfurizing agent bed is detected to exceed the set temperature range, for example, the temperature exceeds 80 ℃, the interlocking is used for opening the cooling gas control valve 52, the temperature of the desulfurizing agent bed is rapidly reduced after the cooling gas reaches the over-temperature desulfurizing agent bed through the main air inlet pipeline 21, and when the temperature sensor 54 detects that the temperature of the desulfurizing agent bed is reduced to be within the set temperature range, for example, 50 ℃, the cooling gas control valve 52 is closed, so that the cooling process is completed. The cooling principles involved in the various desulfurization processes are described above and will not be described in detail.
After the first desulfurization process is performed for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the emission standard requirement, the terminal purified gas is switched to the second desulfurization tower 12 to perform short-time independent operation, and the desulfurizing agent in the first desulfurization tower 11 is replaced in time.
Specifically, the second desulfurization process performed by the second desulfurization tower 12 alone includes: the second intake valve 25 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the second desulfurizing tower 12 through the main air inlet pipeline 21 and the second sub air inlet pipeline 23, and dry desulfurization operation is carried out, so that the terminal purified gas is obtained.
The terminal purge gas is discharged from the second desulfurization tower 12, and is discharged through the second sub-purge gas line 43 and the main purge gas line 41 in this order.
In the second desulfurization process, the temperature sensor 54 provided in the second desulfurization tower 12 is used to detect the temperature of the desulfurizing agent bed in the second desulfurization tower 12, and the opening of the cooling gas control valve 52 is controlled according to the temperature of the desulfurizing agent bed, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the desulfurizing agent bed temperature is maintained within a set range.
After the replacement of the desulfurizing agent in the first desulfurizing tower 11 is completed, the two towers are required to be connected in series again, and the first desulfurizing tower 11 filled with fresh desulfurizing agent is connected in series after the second desulfurizing tower 12 which has undergone partial reaction is connected in front in order to improve the desulfurizing efficiency.
Specifically, the third desulfurization process performed by the second desulfurization tower 12 in series with the first desulfurization tower 11 includes: the second intake valve 25, the second transfer valve 34 and the first purge valve 44 are opened while the remaining valves are closed.
The raw material gas to be desulfurized sequentially enters the second desulfurizing tower 12 through the main air inlet pipeline 21 and the second sub air inlet pipeline 23, and the dry desulfurizing operation is carried out to obtain intermediate purified gas.
The intermediate purified gas is discharged from the second desulfurizing tower 12, enters the first desulfurizing tower 11 through the second transfer pipeline 32, and is subjected to dry desulfurizing operation again to obtain the terminal purified gas.
The terminal purge gas is discharged from the first desulfurizing tower 11, and sequentially discharged through the first sub purge gas line 42 and the main purge gas line 41.
In the third desulfurization process, the temperature sensors 54 provided in the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizing agent beds in the first desulfurization tower 11 and the second desulfurization tower 12, respectively, and the opening of the cooling gas control valve 52 is controlled according to the temperatures of the desulfurizing agent beds, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the temperatures of the desulfurizing agent beds are maintained within a set range.
After the third desulfurization process is performed for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the malodorous emission standard, the first desulfurization tower 11 is switched to perform short-time independent operation, and the desulfurizing agent in the second desulfurization tower 12 is replaced in time.
Specifically, the fourth desulfurization process performed by the first desulfurization tower 11 alone includes: the first intake valve 24 and the first purge valve 44 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the first desulfurizing tower 11 through the main air inlet pipeline 21 and the first sub air inlet pipeline 22, and dry desulfurization operation is carried out, so that the terminal purified gas is obtained.
The terminal purge gas is discharged from the first desulfurizing tower 11, and sequentially discharged through the first sub purge gas line 42 and the main purge gas line 41.
In the fourth desulfurization process, the temperature sensor 54 provided in the first desulfurization tower 11 is used to detect the temperature of the desulfurizing agent bed in the first desulfurization tower 11, and the opening of the cooling gas control valve 52 is controlled according to the desulfurizing agent bed temperature, so that the flow rate of the cooling gas entering the main intake line 21 is controlled to keep the desulfurizing agent bed temperature within the set range.
It should be noted that, based on the above-mentioned concept according to the embodiment of the present invention, more desulfurizing towers, for example, 3 desulfurizing towers, 4 desulfurizing towers, 5 desulfurizing towers, etc., may be provided to perform the above-mentioned four modes, so that the desulfurizing efficiency and the operation safety are significantly improved.
In another aspect, embodiments of the present invention provide a dry desulfurization method employing any one of the dry desulfurization apparatuses described above.
In one possible implementation, the dry desulfurization method includes: the first desulfurization process is performed by the first desulfurization tower 11 connected in series with the second desulfurization tower 12.
The first desulfurization process includes: the first intake valve 24, the first changeover valve 33 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized sequentially enters the first desulfurizing tower 11 through the main air inlet pipeline 21 and the first sub air inlet pipeline 22, and is subjected to dry desulfurization operation to obtain intermediate purified gas.
The intermediate purified gas is discharged from the first desulfurization tower 11 and enters the second desulfurization tower 12 through the first transfer line 31, and the dry desulfurization operation is performed again to obtain a terminal purified gas.
The terminal purge gas is discharged from the second desulfurization tower 12, and is discharged through the second sub-purge gas line 43 and the main purge gas line 41 in this order.
In the first desulfurization process, the temperature sensors 54 provided in the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperature of the desulfurizing agent bed in the first desulfurization tower 11 and the second desulfurization tower 12, respectively, and the opening of the cooling gas control valve 52 is controlled according to the desulfurizing agent bed temperature, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the desulfurizing agent bed temperature is maintained within a set range.
After the first desulfurization process is performed for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the emission standard requirement, the terminal purified gas is switched to the second desulfurization tower 12 to perform short-time independent operation, and the desulfurizing agent in the first desulfurization tower 11 is replaced in time.
In one possible implementation, the dry desulfurization method further includes: the second desulfurization process performed by the second desulfurization tower 12 alone.
The second desulfurization process includes: the second intake valve 25 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the second desulfurizing tower 12 through the main air inlet pipeline 21 and the second sub air inlet pipeline 23, and dry desulfurization operation is carried out, so that the terminal purified gas is obtained.
The terminal purge gas is discharged from the second desulfurization tower 12, and is discharged through the second sub-purge gas line 43 and the main purge gas line 41 in this order.
In the second desulfurization process, the temperature sensor 54 provided in the second desulfurization tower 12 is used to detect the temperature of the desulfurizing agent bed in the second desulfurization tower 12, and the opening of the cooling gas control valve 52 is controlled according to the temperature of the desulfurizing agent bed, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the desulfurizing agent bed temperature is maintained within a set range.
After the replacement of the desulfurizing agent in the first desulfurizing tower 11 is completed, the two towers are required to be connected in series again, and the first desulfurizing tower 11 filled with fresh desulfurizing agent is connected in series after the second desulfurizing tower 12 which has undergone partial reaction is connected in front in order to improve the desulfurizing efficiency.
In one possible implementation, the dry desulfurization method further includes: the second desulfurization tower 12 is connected in series with the third desulfurization process performed by the first desulfurization tower 11.
The third desulfurization process includes: the second intake valve 25, the second transfer valve 34 and the first purge valve 44 are opened while the remaining valves are closed.
The raw material gas to be desulfurized sequentially enters the second desulfurizing tower 12 through the main air inlet pipeline 21 and the second sub air inlet pipeline 23, and the dry desulfurizing operation is carried out to obtain intermediate purified gas.
The intermediate purified gas is discharged from the second desulfurizing tower 12, enters the first desulfurizing tower 11 through the second transfer pipeline 32, and is subjected to dry desulfurizing operation again to obtain the terminal purified gas.
The terminal purge gas is discharged from the first desulfurizing tower 11, and sequentially discharged through the first sub purge gas line 42 and the main purge gas line 41.
In the third desulfurization process, the temperature sensors 54 provided in the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizing agent beds in the first desulfurization tower 11 and the second desulfurization tower 12, respectively, and the opening of the cooling gas control valve 52 is controlled according to the temperatures of the desulfurizing agent beds, so that the flow rate of the cooling gas entering the main intake line 21 is controlled, and the temperatures of the desulfurizing agent beds are maintained within a set range.
After the third desulfurization process is performed for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the malodorous emission standard, the first desulfurization tower 11 is switched to perform short-time independent operation, and the desulfurizing agent in the second desulfurization tower 12 is replaced in time.
In one possible implementation, the dry desulfurization method further includes: the fourth desulfurization process performed by the first desulfurization tower 11 alone.
The fourth desulfurization process includes: the first intake valve 24 and the first purge valve 44 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the first desulfurizing tower 11 through the main air inlet pipeline 21 and the first sub air inlet pipeline 22, and dry desulfurization operation is carried out, so that the terminal purified gas is obtained.
The terminal purge gas is discharged from the first desulfurizing tower 11, and sequentially discharged through the first sub purge gas line 42 and the main purge gas line 41.
In the fourth desulfurization process, the temperature sensor 54 provided in the first desulfurization tower 11 is used to detect the temperature of the desulfurizing agent bed in the first desulfurization tower 11, and the opening of the cooling gas control valve 52 is controlled according to the desulfurizing agent bed temperature, so that the flow rate of the cooling gas entering the main intake line 21 is controlled to keep the desulfurizing agent bed temperature within the set range.
For the desulfurization process described above, the cooling gas is an inert gas such as nitrogen, and the pressure of the cooling gas is higher than the pressure of the raw material gas to ensure that the cooling gas can smoothly enter the inside of the desulfurization tower.
In summary, the desulfurization device and the desulfurization method provided by the embodiment of the invention have at least the following advantages:
(1) The raw material gas flows out from the lower part of the tower body through the upper inlet and lower outlet processes adopted by the desulfurizing tower, so that the pulverization of the desulfurizing agent is reduced, and the reaction residence time is prolonged. The two desulfurizing towers are freely operated in series, and the utilization rate of the desulfurizing agent is improved in an up-in and down-out mode.
(2) The temperature measuring probe is arranged in the desulfurizing tower, the temperature exceeds the set temperature, the cooling nitrogen gas inlet valve is automatically opened, and the desulfurizing agent bed is cooled, so that heat accumulation caused by severe reaction or oxygen-containing regeneration reaction of the high-concentration raw material gas desulfurizing agent is controlled, cooling is carried out when necessary, and the safety of the working process is ensured. The design of automatic cooling enables the desulfurization device to adapt to the temperature rise working condition caused by heat accumulation due to high sulfur content and even oxygen entering.
(3) Flame arresters arranged on the inlet pipeline and the outlet pipeline can prevent flame from spreading, and the safety of the working process is further improved.
(4) The operation is simple and safe, and the unattended operation is easy to realize.
Therefore, compared with the prior art, the device and the method provided by the embodiment of the invention have the advantages of greatly improving scientificity, advancement and safety, providing technical support for the design and manufacture of the method and the equipment for desulfurizing the high-hydrogen sulfide concentration, especially the oxygen-containing mixed gas in the future, and having wide application space for the current domestic desulfurization requirement of high-hydrogen sulfide-containing gas such as water flash steam of sulfur-containing field gas fields.
In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A dry desulfurization apparatus, characterized by comprising: the device comprises a first desulfurizing tower, a second desulfurizing tower, a main air inlet pipeline, a first sub air inlet pipeline, a second sub air inlet pipeline, a first switching pipeline, a second switching pipeline, a main purified gas pipeline, a first sub purified gas pipeline, a second sub purified gas pipeline, a cooling gas pipeline, a first air inlet valve, a second air inlet valve, a first switching valve, a second switching valve, a first purified gas valve, a second purified gas valve, a cooling gas control valve, a temperature sensor, a cooling gas check valve, a first pipeline flame arrester, a second pipeline flame arrester, a main blowdown pipeline, a first sub blowdown pipeline, a second sub blowdown pipeline and a blowdown valve;
the outlet end of the main air inlet pipeline is simultaneously communicated with the inlet ends of the first sub air inlet pipeline and the second sub air inlet pipeline;
the outlet end of the first sub air inlet pipeline is communicated with the air inlet of the first desulfurizing tower, and the outlet end of the second sub air inlet pipeline is communicated with the air inlet of the second desulfurizing tower;
the inlet end of the first transfer pipeline is communicated with the air outlet of the first desulfurizing tower, and the outlet end of the first transfer pipeline is communicated with the air inlet of the second desulfurizing tower;
The inlet end of the second transfer pipeline is communicated with the air outlet of the second desulfurizing tower, and the outlet end of the second transfer pipeline is communicated with the air inlet of the first desulfurizing tower;
the inlet end of the first sub-purified gas pipeline is communicated with the first transfer pipeline, and the outlet end of the first sub-purified gas pipeline is communicated with the inlet end of the main purified gas pipeline;
the inlet end of the second sub-purifying gas pipeline is communicated with the second switching pipeline, and the outlet end of the second sub-purifying gas pipeline is communicated with the inlet end of the main purifying gas pipeline;
The outlet end of the cooling gas pipeline is communicated with the main air inlet pipeline, and the cooling gas check valve is positioned on the cooling gas pipeline and is positioned at the downstream of the cooling gas control valve;
the first air inlet valve is positioned on the first sub-air inlet pipe line;
the second air inlet valve is positioned on the second sub-air inlet pipe line;
the first transfer valve is positioned on the first transfer line and downstream of the inlet end of the first sub-purge gas line;
the second transfer valve is positioned on the second transfer pipeline and is positioned at the downstream of the inlet end of the second sub-purified gas pipeline;
The first purifying air valve is positioned on the first sub purifying air pipeline;
the second purifying air valve is positioned on the second sub purifying air pipeline;
The temperature sensors are respectively arranged on the first desulfurization tower and the second desulfurization tower and are used for measuring the temperature of the desulfurizing agent beds in the first desulfurization tower and the second desulfurization tower, the first desulfurization tower and the second desulfurization tower are used for enabling raw gas to enter from the upper parts of the tower bodies of the first desulfurization tower and the second desulfurization tower, and the desulfurized purified gas flows out from the lower parts of the tower bodies of the first desulfurization tower and the second desulfurization tower;
The cooling gas control valve is positioned on the cooling gas pipeline and is electrically connected with the temperature sensor, and is used for adjusting the opening according to the temperature information measured by the temperature sensor so as to control the flow of the cooling gas entering the main gas inlet pipeline; the first pipeline flame arrestor is positioned on the main air inlet pipeline, and the second pipeline flame arrestor is positioned on the main purifying air pipeline;
The inlet end of the first sub-blowdown pipeline is communicated with a blowdown outlet of the first desulfurizing tower; the inlet end of the second sub-blowdown pipeline is communicated with a blowdown outlet of the second desulfurizing tower; the outlet ends of the first sub-blow-down pipeline and the second sub-blow-down pipeline are communicated with the inlet end of the main blow-down pipeline; the drain valve is respectively positioned on the main drain pipeline, the first sub drain pipeline and the second sub drain pipeline;
When a first desulfurization process is carried out by connecting a first desulfurization tower in series with a second desulfurization tower, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of a desulfurizing agent bed in the first desulfurization tower and the second desulfurization tower respectively, and the opening degree of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent bed, so that the flow rate of cooling gas entering a main air inlet pipeline is controlled, and the temperature of the desulfurizing agent bed is kept within a set range;
After the first desulfurization process is carried out for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the emission standard requirement, switching to the second desulfurization tower to independently operate, and when the second desulfurization process is independently carried out by the second desulfurization tower, detecting the temperature of a desulfurizing agent bed layer in the second desulfurization tower by using a temperature sensor arranged on the second desulfurization tower, controlling the opening of the cooling gas control valve according to the temperature of the desulfurizing agent bed layer, and further controlling the flow rate of the cooling gas entering the main air inlet pipeline to keep the temperature of the desulfurizing agent bed layer within a set range;
When the second desulfurizing tower is connected in series with the third desulfurizing process carried out by the first desulfurizing tower, temperature sensors arranged on the first desulfurizing tower and the second desulfurizing tower are used for detecting the temperatures of desulfurizing agent beds in the first desulfurizing tower and the second desulfurizing tower respectively, the opening of the cooling gas control valve is controlled according to the temperatures of the desulfurizing agent beds, and then the flow rate of cooling gas entering a main air inlet pipeline is controlled, so that the temperatures of the desulfurizing agent beds are kept within a set range, wherein the first desulfurizing tower filled with fresh desulfurizing agent is connected in series after the second desulfurizing tower is connected in front;
After the third desulfurization process is carried out for a period of time, when the concentration of hydrogen sulfide in the terminal purified gas is detected to be close to the malodor emission standard, the terminal purified gas is switched to the first desulfurization tower to independently operate, the first desulfurization tower is independently used for carrying out the fourth desulfurization process, the temperature sensor arranged on the first desulfurization tower is used for detecting the temperature of a desulfurizing agent bed layer in the first desulfurization tower, the opening of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent bed layer, and the flow of cooling gas entering the main air inlet pipeline is controlled, so that the temperature of the desulfurizing agent bed layer is kept within a set range.
2. A dry desulfurization method, characterized in that the dry desulfurization method employs the dry desulfurization apparatus according to claim 1.
3. The dry desulfurization method according to claim 2, characterized in that the dry desulfurization method comprises: a first desulfurization process performed by connecting the first desulfurization tower in series with the second desulfurization tower;
the first desulfurization process includes: opening the first air inlet valve, the first transfer valve and the second purified air valve, and closing the rest valves at the same time;
The raw material gas to be desulfurized sequentially enters a first desulfurizing tower through a main air inlet pipeline and a first sub air inlet pipeline, and dry desulfurization operation is carried out to obtain intermediate purified gas;
the intermediate purified gas is discharged from the first desulfurizing tower, enters the second desulfurizing tower through the first transfer pipeline, and is subjected to dry desulfurizing operation again to obtain terminal purified gas;
The terminal purified gas is discharged from the second desulfurizing tower and sequentially discharged through a second sub purified gas pipeline and a main purified gas pipeline;
When the first desulfurization process is carried out, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of a desulfurizing agent bed layer in the first desulfurization tower and the second desulfurization tower respectively, and the opening degree of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent bed layer, so that the flow rate of cooling gas entering a main air inlet pipeline is controlled, and the temperature of the desulfurizing agent bed layer is kept within a set range.
4. A dry desulfurization process according to claim 3, characterized in that it comprises: a second desulfurization process performed separately in the second desulfurization tower;
the second desulfurization process includes: opening a second air inlet valve and a second purifying air valve, and closing other valves at the same time;
the raw material gas to be desulfurized enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
The terminal purified gas is discharged from the second desulfurizing tower and sequentially discharged through a second sub purified gas pipeline and a main purified gas pipeline;
And when the second desulfurization process is carried out, detecting the temperature of a desulfurizing agent bed layer in the second desulfurization tower by using a temperature sensor arranged on the second desulfurization tower, controlling the opening of the cooling gas control valve according to the temperature of the desulfurizing agent bed layer, and further controlling the flow rate of cooling gas entering a main air inlet pipeline to keep the temperature of the desulfurizing agent bed layer within a set range.
5. The dry desulfurization method according to claim 4, characterized in that the dry desulfurization method comprises: a third desulfurization process performed by the first desulfurization tower connected in series with the second desulfurization tower;
The third desulfurization process includes: opening a second air inlet valve, a second switching valve and a first purifying air valve, and closing other valves at the same time;
The raw material gas to be desulfurized sequentially enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline, and dry desulfurization operation is carried out to obtain intermediate purified gas;
The intermediate purified gas is discharged from the second desulfurizing tower, enters the first desulfurizing tower through a second switching pipeline, and is subjected to dry desulfurizing operation again to obtain terminal purified gas;
The terminal purified gas is discharged from the first desulfurizing tower and sequentially discharged through a first sub purified gas pipeline and a main purified gas pipeline;
And when the third desulfurization process is carried out, temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are used for detecting the temperature of the desulfurizing agent beds in the first desulfurization tower and the second desulfurization tower respectively, and the opening degree of the cooling gas control valve is controlled according to the temperature of the desulfurizing agent beds, so that the flow rate of cooling gas entering the main air inlet pipeline is controlled, and the temperature of the desulfurizing agent beds is kept within a set range.
6. The dry desulfurization method according to claim 5, characterized in that the dry desulfurization method comprises: a fourth desulfurization process performed by the first desulfurization tower alone;
The fourth desulfurization process includes: opening a first air inlet valve and a first purifying air valve, and closing other valves at the same time;
The raw material gas to be desulfurized enters a first desulfurizing tower through a main air inlet pipeline and a first sub air inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
The terminal purified gas is discharged from the first desulfurizing tower and sequentially discharged through a first sub purified gas pipeline and a main purified gas pipeline;
And when the fourth desulfurization process is performed, detecting the temperature of a desulfurizing agent bed layer in the first desulfurization tower by using a temperature sensor arranged on the first desulfurization tower, controlling the opening of the cooling gas control valve according to the temperature of the desulfurizing agent bed layer, and further controlling the flow rate of cooling gas entering a main air inlet pipeline to keep the temperature of the desulfurizing agent bed layer within a set range.
7. The dry desulfurization method according to claim 6, wherein the cooling gas is an inert gas, and the pressure of the cooling gas is higher than the pressure of the raw material gas.
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