CN113926293A - Dry desulfurization device and desulfurization method - Google Patents

Dry desulfurization device and desulfurization method Download PDF

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Publication number
CN113926293A
CN113926293A CN202010667782.XA CN202010667782A CN113926293A CN 113926293 A CN113926293 A CN 113926293A CN 202010667782 A CN202010667782 A CN 202010667782A CN 113926293 A CN113926293 A CN 113926293A
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pipeline
desulfurization
gas
sub
desulfurization tower
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CN113926293B (en
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计维安
戴万能
李小云
高晓根
张春阳
常宏岗
刘蔷
赵婷
宋彬
李蔚熹
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • 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, a primary air inlet line is communicated with a first sub air inlet line and a second sub air inlet line; the first sub air inlet pipeline and the second sub air inlet pipeline are respectively communicated with the first desulfurizing tower and the second desulfurizing tower; the inlets of the first and second transfer pipelines are respectively communicated with the outlets of the first and second desulfurization towers, and the outlets of the first and second transfer pipelines are respectively communicated with the inlets of the second and first desulfurization towers; the inlets of the first and second sub-purified gas pipelines are respectively communicated with the first and second switching pipelines, and the outlets of the first and second sub-purified gas pipelines are communicated with the main purified gas pipeline; the cooling gas pipeline is communicated with the main gas inlet pipeline; the first and second air inlet valves are respectively positioned on the first and second sub air inlet pipelines; the first switching valve and the second switching valve are respectively positioned on the first switching pipeline and the second switching pipeline; the first and second purge gas valves are located on the first and second sub-purge gas lines, respectively; the temperature sensors are arranged on the first desulfurizing tower and the second desulfurizing tower and are electrically connected with the cooling air control valves on the cooling air pipelines.

Description

Dry desulfurization device and desulfurization method
Technical Field
The invention relates to the technical field of desulfurization, in particular to a dry desulfurization device and a desulfurization method.
Background
Currently common desulfurization methods include the following three types: dry desulfurization, wet desulfurization and biological desulfurization. Wherein, the dry desulfurization is to remove H in gas by using solid particle desulfurizing agents such as ferric oxide, active carbon and the like through the physical and chemical adsorption effect2And S. And is particularly suitable for low latent sulfur content and low hydrogen sulfide concentration (10 g/m)3Below), natural gas at high pressure (above 1 MPa), and biogas.
While for low pressure (near atmospheric pressure), high hydrogen sulfide concentration (100 g/m)3Above), especially under the working condition of containing oxygen, heat can be released violently in the desulfurization process, if the existing dry desulfurization process is directly adopted, heat accumulation is very easy to cause, and the desulfurizer bed layer is over-temperature and spontaneously combusted.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the related art, no effective dry desulfurization measure has been found for desulfurization of a high hydrogen sulfide concentration and an 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 technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, there is provided a dry desulfurization apparatus comprising: the device comprises a first desulfurization tower, a second desulfurization 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 air pipeline, a first sub purified air pipeline, a second sub purified air pipeline, a cooling air pipeline, a first air inlet valve, a second air inlet valve, a first switching valve, a second switching valve, a first purified air valve, a second purified air valve, a cooling air control valve and a temperature sensor;
the outlet end of the primary air intake line communicates with the inlet ends of both the first and second sub air intake lines;
the outlet end of the first sub air inlet pipeline is communicated with the air inlet of the first desulfurization tower, and the outlet end of the second sub air inlet pipeline is communicated with the air inlet of the second desulfurization tower;
the inlet end of the first adapter pipeline is communicated with the gas outlet of the first desulfurization tower, and the outlet end of the first adapter pipeline is communicated with the gas inlet of the second desulfurization tower;
the inlet end of the second transfer pipeline is communicated with the gas outlet of the second desulfurization tower, and the outlet end of the second transfer pipeline is communicated with the gas inlet of the first desulfurization tower;
the inlet end of the first sub-purified air pipeline is communicated with the first adapter pipeline, and the outlet end of the first sub-purified air pipeline is communicated with the inlet end of the main purified air pipeline;
the inlet end of the second sub-purified air pipeline is communicated with the second switching pipeline, and the outlet end of the second sub-purified air pipeline is communicated with the inlet end of the main purified air pipeline;
the outlet end of the cooling gas pipeline is communicated with the main gas inlet pipeline;
the first air inlet valve is positioned on the first sub air inlet pipeline;
the second air inlet valve is positioned on the second sub air inlet pipeline;
the first transfer valve is located on the first transfer line and downstream of the inlet end of the first sub purge gas line;
the second switching valve is positioned on the second switching pipeline and is positioned at the downstream of the inlet end of the second sub purified gas pipeline;
the first purge gas valve is located on the first sub-purge gas line;
the second purge gas valve is located on the second sub-purge gas line;
the temperature sensors are respectively arranged on the first desulfurization tower and the second desulfurization tower and are used for measuring the temperatures of desulfurizer bed layers in the first desulfurization tower and the second desulfurization tower;
the cooling air control valve is located on the cooling air pipeline and electrically connected with the temperature sensor and used for adjusting the opening degree according to the temperature information measured by the temperature sensor.
In one possible implementation, the dry desulfurization apparatus 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, the dry desulfurization apparatus further includes: a first conduit flame arrestor and a second conduit flame arrestor;
the first pipe flame arrestor is located on the main air inlet line;
the second pipeline flame arrester is located on the main purification gas pipeline.
In one possible implementation, the dry desulfurization apparatus further includes: the sewage treatment system comprises a main sewage draining pipeline, a first sub sewage draining pipeline, a second sub sewage draining pipeline and a sewage draining valve;
the inlet end of the first sub-sewage pipeline is communicated with a sewage outlet of the first desulfurization tower;
the inlet end of the second sub-sewage pipeline is communicated with a sewage outlet of the second desulfurization tower;
the outlet ends of the first and second sub sewage pipes are both communicated with the inlet end of the main sewage pipe;
the blowdown valves are respectively located on the main blowdown pipeline, the first sub blowdown pipeline and the second sub blowdown pipeline.
In another aspect, a dry desulfurization method is provided, which employs any one of the dry desulfurization apparatuses described above.
In one possible implementation, the dry desulfurization method includes: the first desulfurization process is carried out by connecting the first desulfurization tower with the second desulfurization tower in series;
the first desulfurization process includes: opening the first air inlet valve, the first switching valve and the second purge valve, and closing the other valves;
the method comprises the following steps that raw material gas to be desulfurized sequentially enters a first desulfurization tower through a main air inlet pipeline and a first sub air inlet pipeline to be subjected to dry desulfurization operation, and intermediate purified gas is obtained;
the intermediate purified gas is discharged from the first desulfurization tower, enters the second desulfurization tower through the first transfer pipeline, and is subjected to dry desulfurization again to obtain terminal purified gas;
the terminal purified gas is discharged from the second desulfurization tower and is discharged through a second sub purified gas pipeline and a main purified gas pipeline in sequence;
when the first desulfurization process is carried out, the temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are respectively used for detecting the temperatures of the desulfurizer beds in the first desulfurization tower and the second desulfurization tower, and the opening degree of the cooling air control valve is controlled according to the temperatures of the desulfurizer beds, so that the flow of cooling air entering the main air inlet pipeline is controlled, and the temperature of the desulfurizer beds is kept within a set range.
In one possible implementation, the dry desulfurization method includes: a second desulfurization process separately performed by a second desulfurization tower;
the second desulfurization process includes: opening a second air inlet valve and a second purified air valve, and closing the other valves;
the raw gas to be desulfurized enters a second desulfurization tower through a main gas inlet pipeline and a second sub gas inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
the terminal purified gas is discharged from the second desulfurization tower and is discharged through a second sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the second desulfurization process, detecting the temperature of a desulfurizer bed layer in the second desulfurization tower by using a temperature sensor arranged on the second desulfurization tower, controlling the opening of the cooling control valve according to the temperature of the desulfurizer bed layer, and further controlling the flow of cooling gas entering the main gas inlet pipeline to keep the temperature of the desulfurizer bed layer within a set range.
In one possible implementation, the dry desulfurization method includes: the second desulfurizing tower is connected in series with the first desulfurizing tower for a third desulfurizing process;
the third desulfurization process includes: opening a second air inlet valve, a second switching valve and a first purifying air valve, and closing the other valves;
the raw gas to be desulfurized enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline in sequence to carry out dry-method desulfurization operation to obtain intermediate purified gas;
the intermediate purified gas is discharged from the second desulfurization tower, enters the first desulfurization tower through a second transfer pipeline, and is subjected to dry desulfurization again to obtain terminal purified gas;
the terminal purified gas is discharged from the first desulfurizing tower and is discharged through a first sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the third desulfurization process, detecting the temperatures of the desulfurizer beds in the first desulfurization tower and the second desulfurization tower by using the temperature sensors arranged on the first desulfurization tower and the second desulfurization tower respectively, and controlling the opening of the cooling air control valve according to the temperature of the desulfurizer bed so as to control the flow of cooling air entering the main air inlet pipeline and keep the temperature of the desulfurizer bed within a set range.
In one possible implementation, the dry desulfurization method includes: a fourth desulfurization process separately performed by the first desulfurization tower;
the fourth desulfurization process includes: opening a first air inlet valve and a first purified air valve, and closing the other valves at the same time;
the method comprises the following steps that raw material gas to be desulfurized enters a first desulfurization tower through a main air inlet pipeline and a first sub air inlet pipeline to be subjected to dry desulfurization operation, and terminal purified gas is obtained;
the terminal purified gas is discharged from the first desulfurizing tower and is discharged through a first sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the fourth desulfurization process, detecting the temperature of a desulfurizer bed layer in the first desulfurization tower by using a temperature sensor arranged on the first desulfurization tower, controlling the opening of the cooling control valve according to the temperature of the desulfurizer bed layer, and further controlling the flow of cooling gas entering the main gas inlet pipeline to keep the temperature of the desulfurizer 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:
in the dry desulfurization device provided by the embodiment of the invention, the first desulfurization tower and the second desulfurization tower are arranged, so that the first desulfurization tower can be connected in series with the second desulfurization tower to perform desulfurization operation under the control of each valve, the second desulfurization tower can also be connected in series with the first desulfurization tower to perform desulfurization operation, and the first desulfurization tower or the second desulfurization tower can also perform desulfurization operation independently. Meanwhile, when the desulfurization is carried out, the temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are respectively used for detecting the bed temperature of the desulfurizing agent in the first desulfurization tower and the second desulfurization tower, and the bed temperature of the desulfurizing agent is detected according to the bed temperature of the desulfurizing agentThe degree controls the opening degree of the cooling air control valve, and further controls the flow of the cooling air entering the main air inlet pipeline, so that the temperature of the desulfurizer bed layer is kept within a set range. By such arrangement, the dry desulfurization device provided by the embodiment of the invention can be suitable for low pressure (close to normal pressure) and high hydrogen sulfide concentration (100 g/m)3Above) and desulfurization of natural gas and biogas under oxygen-containing conditions. 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 in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an exemplary dry desulfurization apparatus according to an embodiment of the present invention.
The reference numerals denote:
11-a first desulfurization tower, 12-a second desulfurization tower,
21-the primary air intake line, 22-the first sub-air intake line, 23-the second sub-air intake line,
24-the first intake valve, 25-the second intake valve,
31-a first switching line, 32-a second switching line, 33-a first switching valve, 34-a second switching valve,
41-the main purified gas line, 42-the first sub-purified gas line, 43-the second sub-purified gas line,
44-a first purge gas valve, 45-a second purge gas valve,
51-cooling gas line, 52-cooling gas control valve, 53-cooling gas check valve, 54-temperature sensor,
61-a first flame arrestor for the pipeline, 62-a second flame arrestor for the pipeline,
71-main blowdown line, 72-first sub blowdown line, 73-second sub blowdown line, 74-blowdown valve.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention 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 air intake line 21, the first sub air intake line 22, the second sub air intake line 23, the first adapter line 31, the second adapter line 32, the main purge air line 41, the first sub purge air line 42, the second sub purge air line 43, the cooling air line 51, the first air intake valve 24, the second air intake valve 25, the first adapter valve 33, the second adapter valve 34, the first purge air valve 44, the second purge air valve 45, the cooling air control valve 52, and the temperature sensor 53.
Wherein the outlet end of the main air intake line 21 communicates with the inlet ends of both the first and second sub air intake lines 22, 23;
the outlet end of the first sub air inlet pipeline 22 is communicated with the air inlet of the first desulfurization tower 11, and the outlet end of the second sub air inlet pipeline 23 is communicated with the air inlet of the second desulfurization tower 12;
the inlet end of the first transfer pipeline 31 is communicated with the gas outlet of the first desulfurization tower 11, and the outlet end of the first transfer pipeline 31 is communicated with the gas inlet of the second desulfurization tower 12;
the inlet end of the second transfer pipeline 32 is communicated with the gas outlet of the second desulfurization tower 12, and the outlet end of the second transfer pipeline 32 is communicated with the gas inlet of the first desulfurization tower 11;
the inlet end of the first sub purge gas line 42 communicates with the first adapter line 31, and the outlet end of the first sub purge gas line 42 communicates with the inlet end of the main purge gas line 41;
the inlet end of the second sub-purge gas line 43 communicates with the second switching line 32, and the outlet end of the second sub-purge gas line 43 communicates with the inlet end of the main purge gas line 41;
the outlet end of the cooling gas line 51 communicates with the primary gas intake line 21;
a first intake valve 24 is located on the first sub-intake line 22;
a second intake valve 25 is located on the second sub-intake 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;
a second switching valve 34 is located on the second switching line 32 downstream of the inlet end of the second sub-purge gas 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;
the temperature sensors 53 are respectively arranged on the first desulfurization tower 11 and the second desulfurization tower 12 and are used for measuring the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12;
the cooling control valve 52 is located on the cooling gas line 51, and the cooling control valve 52 is electrically connected to the temperature sensor 53, and is used for adjusting the opening degree based on the temperature information measured by the temperature sensor 53.
In the dry desulfurization apparatus according to the embodiment of the present invention, the first desulfurization tower 11 and the second desulfurization tower 12 are provided, so that the first desulfurization tower 11 can be connected in series with the second desulfurization tower 12 to perform desulfurization operation, the second desulfurization tower 12 can also be connected in series with the first desulfurization tower 11 to perform desulfurization operation, and the first desulfurization tower 11 or the second desulfurization tower 12 can also perform desulfurization operation independently. Meanwhile, when the desulfurization is performed, the temperature sensors 54 arranged on the first desulfurization tower 11 and the second desulfurization tower 12 are respectively used for detecting the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12, and the opening degree of the cooling control valve 52 is controlled according to the temperatures of the desulfurizer beds, so that the flow of the cooling gas entering the main gas inlet pipeline 21 is controlled, and the temperature of the desulfurizer beds is kept within a set range. By such arrangement, the dry desulfurization device provided by the embodiment of the invention can be suitable for low pressure (close to normal pressure) and high hydrogen sulfide concentration (100 g/m)3Above) and desulfurization of natural gas and biogas under oxygen-containing conditions. 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 desulfurization tower 11 and the second desulfurization tower 12 both adopt a dry desulfurization tower commonly used in the art, a desulfurization agent bed layer is arranged in the desulfurization tower, and the used desulfurization agent may be an iron oxide desulfurization agent.
Further, as shown in fig. 1, the dry desulfurization apparatus provided in the embodiment of the present invention further includes: the cooling gas check valve 53; the cooling gas check valve 53 is located on the cooling gas line 51 and 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 first desulfurization tower 11 and/or the second desulfurization tower 12, the effective cooling of the desulfurizer bed layer inside is realized.
Further, as shown in fig. 1, the dry desulfurization apparatus provided in the embodiment of the present invention further includes: a first pipe flame arrestor 61 and a second pipe flame arrestor 62; wherein the first pipe flame arrestor 61 is located on the primary air intake line 21; a second flame arrestor 62 is located on the main purge gas line 41.
By providing the first and second flame arresters 61, 62 as described above, spread of a flame that may be generated can be prevented, and the safety of the desulfurization process can be improved.
Further, as shown in fig. 1, the dry desulfurization apparatus provided in the embodiment of the present invention further includes: a main sewage line 71, a first sub sewage line 72, a second sub sewage line 73, a sewage valve 74;
wherein, the inlet end of the first sub-blowdown line 72 is communicated with the blowdown port of the first desulfurization tower 11;
the inlet end of the second sub-sewage line 73 is communicated with a sewage discharge outlet of the second desulfurization tower 12;
the outlet ends of the first and second sub sewage pipes 72 and 73 are both communicated with the inlet end of the main sewage pipe 71;
a sewage valve 74 is provided on the main sewage line 71, the first sub sewage line 72 and the second sub sewage line 73, respectively.
Through the arrangement of the main sewage discharge pipeline 71, the first sub sewage discharge pipeline 72, the second sub sewage discharge pipeline 73 and the sewage discharge valve 74, sewage discharged from the bottoms of the first desulfurizing tower 11 and the second desulfurizing tower 12 can be discharged in time, and the use safety and the service life of the desulfurizing device are improved.
The dry desulfurization device provided by the embodiment of the invention has four working modes, which are respectively as follows:
in the first mode: the first desulfurization tower 11 is connected in series with the first desulfurization process performed by the second desulfurization tower 12.
The first desulfurization process includes: the first intake valve 24, the first switching valve 33 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the first desulfurizing tower 11 through the main gas inlet pipeline 21 and the first sub gas inlet pipeline 22 in sequence, and dry-method desulfurization operation is carried out to obtain intermediate purified gas. (in the process, the raw material gas and the desulfurizer reversely contact and react to remove most of hydrogen sulfide in the raw material gas to obtain intermediate purified gas).
The intermediate purified gas is discharged from the first desulfurization tower 11, enters the second desulfurization tower 12 through the first transfer line 31, and is subjected to dry desulfurization again to obtain the terminal purified gas. In the embodiment of the invention, the terminal purified gas can meet the emission standard requirement.
The final purified gas is discharged from the second desulfurization tower 12, and is sequentially discharged through the second sub-purified gas line 43 and the main purified gas line 41.
During the first desulfurization process, the temperature sensors 54 disposed on the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperatures of the desulfurizer beds, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperatures of the desulfurizer beds within a set range.
It should be noted that, in the embodiment of the present invention, one or more temperature sensors 54 are disposed on each of the first desulfurization tower 11 and the second desulfurization tower 12, and a temperature probe of each temperature sensor 54 is located at the desulfurization agent bed layer inside the desulfurization tower, so as to be able to detect the temperature of the desulfurization agent bed layer (when a plurality of temperature sensors 54 are used, the detected highest temperature is taken as a reference). If the detected maximum temperature of the desulfurizer bed layer exceeds the set temperature range, for example, exceeds 80 ℃, the cooling control valve 52 is interlocked and opened, after the cooling gas reaches the over-temperature desulfurizer bed layer through the main gas inlet pipeline 21, the temperature of the desulfurizer bed layer is rapidly reduced, and when the temperature sensor 54 detects that the temperature of the desulfurizer bed layer is reduced to the set temperature range, for example, 50 ℃, the cooling control valve 52 is closed, and the cooling process is completed. The cooling principles involved in the following desulfurization processes are as described above and will not be further described.
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, the second desulfurization tower 12 needs to be switched to carry out independent operation for a short time, and the desulfurizer in the first desulfurization tower 11 needs to be 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.
And the raw gas to be desulfurized enters the second desulfurization tower 12 through the main gas inlet pipeline 21 and the second sub gas inlet pipeline 23 to carry out dry desulfurization operation, so that the terminal purified gas is obtained.
The final purified gas is discharged from the second desulfurization tower 12, and is sequentially discharged through the second sub-purified gas line 43 and the main purified gas line 41.
During the second desulfurization process, the temperature sensor 54 disposed on the second desulfurization tower 12 is used to detect the temperature of the desulfurizer bed layer inside the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperature of the desulfurizer bed layer, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer bed layer within a set range.
After the desulfurizer in the first desulfurizing tower 11 is replaced, two-tower series connection is needed to be realized again, in order to improve the utilization rate of desulfurization, the second desulfurizing tower 12 which is subjected to partial reaction is connected in front, and the first desulfurizing tower 11 filled with fresh desulfurizer is connected in series at the back.
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 changeover valve 34 and the first purge valve 44 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the second desulfurizing tower 12 through the main gas inlet pipeline 21 and the second sub gas inlet pipeline 23 in sequence, and dry desulfurization operation is carried out to obtain intermediate purified gas.
The intermediate purified gas is discharged from the second desulfurization tower 12, enters the first desulfurization tower 11 through the second transfer pipeline 32, and is subjected to dry desulfurization again to obtain the terminal purified gas.
The final purified gas is discharged from the first desulfurization tower 11, and is sequentially discharged through the first sub-purified gas line 42 and the main purified gas line 41.
During the third desulfurization process, the temperature sensors 54 disposed on the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperatures of the desulfurizer beds, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer beds within a set range.
After the third desulfurization process is performed for a period of time, when it is detected that the concentration of hydrogen sulfide in the terminal purified gas is close to the odor emission standard, the first desulfurization tower 11 needs to be switched to perform independent operation for a short time, and the desulfurizing agent in the second desulfurization tower 12 needs to be 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 gas inlet pipeline 21 and the first sub gas inlet pipeline 22 to be subjected to dry desulfurization operation, and the terminal purified gas is obtained.
The final purified gas is discharged from the first desulfurization tower 11, and is sequentially discharged through the first sub-purified gas line 42 and the main purified gas line 41.
In the fourth desulfurization process, the temperature sensor 54 disposed on the first desulfurization tower 11 is used to detect the temperature of the desulfurizer bed layer inside the first desulfurization tower 11, and the opening of the cooling control valve 52 is controlled according to the temperature of the desulfurizer bed layer, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer bed layer within a set range.
Based on the concept of the embodiment of the present invention, more desulfurization towers, for example, 3, 4, 5, etc., can be provided to perform the above four modes, thereby significantly improving the desulfurization efficiency and the operation safety.
In another aspect, embodiments of the present invention provide a dry desulfurization method, which employs any one of the dry desulfurization apparatuses mentioned above.
In one possible implementation, the dry desulfurization method includes: the first desulfurization tower 11 is connected in series with the first desulfurization process performed by the second desulfurization tower 12.
The first desulfurization process includes: the first intake valve 24, the first switching valve 33 and the second purge valve 45 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the first desulfurizing tower 11 through the main gas inlet pipeline 21 and the first sub gas inlet pipeline 22 in sequence, and dry-method desulfurization operation is carried out to obtain intermediate purified gas.
The intermediate purified gas is discharged from the first desulfurization tower 11, enters the second desulfurization tower 12 through the first transfer line 31, and is subjected to dry desulfurization again to obtain the terminal purified gas.
The final purified gas is discharged from the second desulfurization tower 12, and is sequentially discharged through the second sub-purified gas line 43 and the main purified gas line 41.
During the first desulfurization process, the temperature sensors 54 disposed on the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperatures of the desulfurizer beds, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperatures of the desulfurizer beds 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, the second desulfurization tower 12 needs to be switched to carry out independent operation for a short time, and the desulfurizer in the first desulfurization tower 11 needs to be replaced in time.
In one possible implementation, the dry desulfurization method further includes: and a second desulfurization process separately performed by the second desulfurization tower 12.
The second desulfurization process includes: the second intake valve 25 and the second purge valve 45 are opened while the remaining valves are closed.
And the raw gas to be desulfurized enters the second desulfurization tower 12 through the main gas inlet pipeline 21 and the second sub gas inlet pipeline 23 to carry out dry desulfurization operation, so that the terminal purified gas is obtained.
The final purified gas is discharged from the second desulfurization tower 12, and is sequentially discharged through the second sub-purified gas line 43 and the main purified gas line 41.
During the second desulfurization process, the temperature sensor 54 disposed on the second desulfurization tower 12 is used to detect the temperature of the desulfurizer bed layer inside the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperature of the desulfurizer bed layer, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer bed layer within a set range.
After the desulfurizer in the first desulfurizing tower 11 is replaced, two-tower series connection is needed to be realized again, in order to improve the utilization rate of desulfurization, the second desulfurizing tower 12 which is subjected to partial reaction is connected in front, and the first desulfurizing tower 11 filled with fresh desulfurizer is connected in series at the back.
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 changeover valve 34 and the first purge valve 44 are opened while the remaining valves are closed.
The raw gas to be desulfurized enters the second desulfurizing tower 12 through the main gas inlet pipeline 21 and the second sub gas inlet pipeline 23 in sequence, and dry desulfurization operation is carried out to obtain intermediate purified gas.
The intermediate purified gas is discharged from the second desulfurization tower 12, enters the first desulfurization tower 11 through the second transfer pipeline 32, and is subjected to dry desulfurization again to obtain the terminal purified gas.
The final purified gas is discharged from the first desulfurization tower 11, and is sequentially discharged through the first sub-purified gas line 42 and the main purified gas line 41.
During the third desulfurization process, the temperature sensors 54 disposed on the first desulfurization tower 11 and the second desulfurization tower 12 are used to detect the temperatures of the desulfurizer beds inside the first desulfurization tower 11 and the second desulfurization tower 12, and the opening of the cooling control valve 52 is controlled according to the temperatures of the desulfurizer beds, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer beds within a set range.
After the third desulfurization process is performed for a period of time, when it is detected that the concentration of hydrogen sulfide in the terminal purified gas is close to the odor emission standard, the first desulfurization tower 11 needs to be switched to perform independent operation for a short time, and the desulfurizing agent in the second desulfurization tower 12 needs to be replaced in time.
In one possible implementation, the dry desulfurization method further includes: and a fourth desulfurization process separately performed by the first desulfurization tower 11.
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 gas inlet pipeline 21 and the first sub gas inlet pipeline 22 to be subjected to dry desulfurization operation, and the terminal purified gas is obtained.
The final purified gas is discharged from the first desulfurization tower 11, and is sequentially discharged through the first sub-purified gas line 42 and the main purified gas line 41.
In the fourth desulfurization process, the temperature sensor 54 disposed on the first desulfurization tower 11 is used to detect the temperature of the desulfurizer bed layer inside the first desulfurization tower 11, and the opening of the cooling control valve 52 is controlled according to the temperature of the desulfurizer bed layer, so as to control the flow of the cooling gas entering the main gas inlet pipeline 21, and keep the temperature of the desulfurizer bed layer within a set range.
For the desulfurization process, the cooling gas is an inert gas, such as nitrogen, and the pressure of the cooling gas is higher than that of the feed gas, so as 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 passes through the process of top-in bottom-out adopted by the desulfurizing tower, and the purified gas after desulfurization flows out from the lower part of the tower body, thereby reducing the pulverization of the desulfurizing agent and prolonging the reaction residence time. The two desulfurizing towers are freely connected in series for operation, and the upper part is in a mode of feeding in and discharging out, so that the utilization rate of the desulfurizing agent is improved.
(2) The temperature measuring probe is arranged in the desulfurizing tower, the cooling nitrogen gas inlet valve is automatically opened when the temperature exceeds the set temperature, and the desulfurizing agent bed layer is cooled to control heat accumulation caused by violent reaction or oxygen regeneration reaction of the high-concentration raw material gas desulfurizing agent, and the cooling is carried out when necessary, so that the safety of the working process is ensured. The design of automatic cooling makes this desulphurization unit can adapt to the temperature rise operating mode that high sulphur content even oxygen gets into to bring the heat accumulation production.
(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 unattended operation is easy to realize.
Therefore, the device and the method provided by the embodiment of the invention are greatly improved in scientificity, advancement and safety compared with the prior art, provide technical support for the design and manufacture of a desulfurization method and equipment for high-concentration hydrogen sulfide, especially oxygen-containing mixed gas in the future, and have wide application space for the desulfurization requirement of domestic high-concentration hydrogen sulfide gas such as water flash gas of a sulfur-containing field.
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" means two or more unless expressly limited otherwise.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A dry desulfurization apparatus, characterized in that it comprises: the device comprises a first desulfurization tower, a second desulfurization 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 air pipeline, a first sub purified air pipeline, a second sub purified air pipeline, a cooling air pipeline, a first air inlet valve, a second air inlet valve, a first switching valve, a second switching valve, a first purified air valve, a second purified air valve, a cooling air control valve and a temperature sensor;
the outlet end of the primary air intake line communicates with the inlet ends of both the first and second sub air intake lines;
the outlet end of the first sub air inlet pipeline is communicated with the air inlet of the first desulfurization tower, and the outlet end of the second sub air inlet pipeline is communicated with the air inlet of the second desulfurization tower;
the inlet end of the first adapter pipeline is communicated with the gas outlet of the first desulfurization tower, and the outlet end of the first adapter pipeline is communicated with the gas inlet of the second desulfurization tower;
the inlet end of the second transfer pipeline is communicated with the gas outlet of the second desulfurization tower, and the outlet end of the second transfer pipeline is communicated with the gas inlet of the first desulfurization tower;
the inlet end of the first sub-purified air pipeline is communicated with the first adapter pipeline, and the outlet end of the first sub-purified air pipeline is communicated with the inlet end of the main purified air pipeline;
the inlet end of the second sub-purified air pipeline is communicated with the second switching pipeline, and the outlet end of the second sub-purified air pipeline is communicated with the inlet end of the main purified air pipeline;
the outlet end of the cooling gas pipeline is communicated with the main gas inlet pipeline;
the first air inlet valve is positioned on the first sub air inlet pipeline;
the second air inlet valve is positioned on the second sub air inlet pipeline;
the first transfer valve is located on the first transfer line and downstream of the inlet end of the first sub purge gas line;
the second switching valve is positioned on the second switching pipeline and is positioned at the downstream of the inlet end of the second sub purified gas pipeline;
the first purge gas valve is located on the first sub-purge gas line;
the second purge gas valve is located on the second sub-purge gas line;
the temperature sensors are respectively arranged on the first desulfurization tower and the second desulfurization tower and are used for measuring the temperatures of desulfurizer bed layers in the first desulfurization tower and the second desulfurization tower;
the cooling air control valve is located on the cooling air pipeline and electrically connected with the temperature sensor and used for adjusting the opening degree according to the temperature information measured by the temperature sensor.
2. The dry desulfurization apparatus according to claim 1, further comprising: 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.
3. The dry desulfurization apparatus according to claim 1, further comprising: a first conduit flame arrestor and a second conduit flame arrestor;
the first pipe flame arrestor is located on the main air inlet line;
the second pipeline flame arrester is located on the main purification gas pipeline.
4. The dry desulfurization apparatus according to claim 1, further comprising: the sewage treatment system comprises a main sewage draining pipeline, a first sub sewage draining pipeline, a second sub sewage draining pipeline and a sewage draining valve;
the inlet end of the first sub-sewage pipeline is communicated with a sewage outlet of the first desulfurization tower;
the inlet end of the second sub-sewage pipeline is communicated with a sewage outlet of the second desulfurization tower;
the outlet ends of the first and second sub sewage pipes are both communicated with the inlet end of the main sewage pipe;
the blowdown valves are respectively located on the main blowdown pipeline, the first sub blowdown pipeline and the second sub blowdown pipeline.
5. A dry desulfurization method characterized by using the dry desulfurization apparatus according to any one of claims 1 to 4.
6. The dry desulfurization method according to claim 5, characterized in that it comprises: the first desulfurization process is carried out by connecting the first desulfurization tower with the second desulfurization tower in series;
the first desulfurization process includes: opening the first air inlet valve, the first switching valve and the second purge valve, and closing the other valves;
the method comprises the following steps that raw material gas to be desulfurized sequentially enters a first desulfurization tower through a main air inlet pipeline and a first sub air inlet pipeline to be subjected to dry desulfurization operation, and intermediate purified gas is obtained;
the intermediate purified gas is discharged from the first desulfurization tower, enters the second desulfurization tower through the first transfer pipeline, and is subjected to dry desulfurization again to obtain terminal purified gas;
the terminal purified gas is discharged from the second desulfurization tower and is discharged through a second sub purified gas pipeline and a main purified gas pipeline in sequence;
when the first desulfurization process is carried out, the temperature sensors arranged on the first desulfurization tower and the second desulfurization tower are respectively used for detecting the temperatures of the desulfurizer beds in the first desulfurization tower and the second desulfurization tower, and the opening degree of the cooling air control valve is controlled according to the temperatures of the desulfurizer beds, so that the flow of cooling air entering the main air inlet pipeline is controlled, and the temperature of the desulfurizer beds is kept within a set range.
7. The dry desulfurization method according to claim 6, characterized in that it comprises: a second desulfurization process separately performed by a second desulfurization tower;
the second desulfurization process includes: opening a second air inlet valve and a second purified air valve, and closing the other valves;
the raw gas to be desulfurized enters a second desulfurization tower through a main gas inlet pipeline and a second sub gas inlet pipeline to carry out dry desulfurization operation, so as to obtain terminal purified gas;
the terminal purified gas is discharged from the second desulfurization tower and is discharged through a second sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the second desulfurization process, detecting the temperature of a desulfurizer bed layer in the second desulfurization tower by using a temperature sensor arranged on the second desulfurization tower, controlling the opening of the cooling control valve according to the temperature of the desulfurizer bed layer, and further controlling the flow of cooling gas entering the main gas inlet pipeline to keep the temperature of the desulfurizer bed layer within a set range.
8. The dry desulfurization method according to claim 7, characterized in that it comprises: the second desulfurizing tower is connected in series with the first desulfurizing tower for a third desulfurizing process;
the third desulfurization process includes: opening a second air inlet valve, a second switching valve and a first purifying air valve, and closing the other valves;
the raw gas to be desulfurized enters a second desulfurizing tower through a main air inlet pipeline and a second sub air inlet pipeline in sequence to carry out dry-method desulfurization operation to obtain intermediate purified gas;
the intermediate purified gas is discharged from the second desulfurization tower, enters the first desulfurization tower through a second transfer pipeline, and is subjected to dry desulfurization again to obtain terminal purified gas;
the terminal purified gas is discharged from the first desulfurizing tower and is discharged through a first sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the third desulfurization process, detecting the temperatures of the desulfurizer beds in the first desulfurization tower and the second desulfurization tower by using the temperature sensors arranged on the first desulfurization tower and the second desulfurization tower respectively, and controlling the opening of the cooling air control valve according to the temperature of the desulfurizer bed so as to control the flow of cooling air entering the main air inlet pipeline and keep the temperature of the desulfurizer bed within a set range.
9. The dry desulfurization method according to claim 8, characterized in that it comprises: a fourth desulfurization process separately performed by the first desulfurization tower;
the fourth desulfurization process includes: opening a first air inlet valve and a first purified air valve, and closing the other valves at the same time;
the method comprises the following steps that raw material gas to be desulfurized enters a first desulfurization tower through a main air inlet pipeline and a first sub air inlet pipeline to be subjected to dry desulfurization operation, and terminal purified gas is obtained;
the terminal purified gas is discharged from the first desulfurizing tower and is discharged through a first sub purified gas pipeline and a main purified gas pipeline in sequence;
and during the fourth desulfurization process, detecting the temperature of a desulfurizer bed layer in the first desulfurization tower by using a temperature sensor arranged on the first desulfurization tower, controlling the opening of the cooling control valve according to the temperature of the desulfurizer bed layer, and further controlling the flow of cooling gas entering the main gas inlet pipeline to keep the temperature of the desulfurizer bed layer within a set range.
10. The dry desulfurization method according to claim 9, wherein the cooling gas is an inert gas, and the pressure of the cooling gas is higher than that of the feed gas.
CN202010667782.XA 2020-07-13 2020-07-13 Dry desulfurization device and desulfurization method Active CN113926293B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04225814A (en) * 1990-12-26 1992-08-14 Ishikawajima Harima Heavy Ind Co Ltd Method for temperature controlling of regenerating tower and device therefor
CN101343572A (en) * 2008-08-28 2009-01-14 上海交通大学 Multi-layer desulfurization reaction tower
CN203990299U (en) * 2014-06-26 2014-12-10 中国石油化工集团公司 Gas protection desulfurizer
CN104525057A (en) * 2014-12-26 2015-04-22 太原理工大学 Device and process for preparing gasoline using synthesis gas by two-step method
CN204569860U (en) * 2015-04-20 2015-08-19 阳光凯迪新能源集团有限公司 A kind of changeable flow process desulfurizer
CN106039925A (en) * 2016-07-12 2016-10-26 中国石油化工股份有限公司 Cooling device and method for adsorption tank in oil and gas recovery

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04225814A (en) * 1990-12-26 1992-08-14 Ishikawajima Harima Heavy Ind Co Ltd Method for temperature controlling of regenerating tower and device therefor
CN101343572A (en) * 2008-08-28 2009-01-14 上海交通大学 Multi-layer desulfurization reaction tower
CN203990299U (en) * 2014-06-26 2014-12-10 中国石油化工集团公司 Gas protection desulfurizer
CN104525057A (en) * 2014-12-26 2015-04-22 太原理工大学 Device and process for preparing gasoline using synthesis gas by two-step method
CN204569860U (en) * 2015-04-20 2015-08-19 阳光凯迪新能源集团有限公司 A kind of changeable flow process desulfurizer
CN106039925A (en) * 2016-07-12 2016-10-26 中国石油化工股份有限公司 Cooling device and method for adsorption tank in oil and gas recovery

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