CN114686282B - Natural gas wet desulphurization device and method - Google Patents
Natural gas wet desulphurization device and method Download PDFInfo
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- CN114686282B CN114686282B CN202210346949.1A CN202210346949A CN114686282B CN 114686282 B CN114686282 B CN 114686282B CN 202210346949 A CN202210346949 A CN 202210346949A CN 114686282 B CN114686282 B CN 114686282B
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- 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
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention discloses a natural gas wet desulphurization device and a method, comprising an absorption flotation tower, a regeneration filtering device and an alkali adding system; the absorption flotation tower comprises a tower body, a natural gas aerator is sequentially arranged in the tower body from bottom to top, a liquid-rich tank, a packing layer, a spraying device and a demisting layer, a desulfurizer outlet and a circulating desulfurizer inlet are arranged at the bottom of the tower body, a natural gas outlet is arranged at the top of the tower body, the desulfurizer outlet is connected with the spraying device through a conveying pipeline, the liquid-rich tank is communicated with a deaerator through a liquid-phase communicating pipe, the top of the deaerator is communicated with the inside of the tower body through a gas-phase communicating pipe, the bottom of the deaerator is connected with a regeneration filtering device through a rich liquid outlet pipe, the regeneration filtering device is connected with the circulating desulfurizer inlet through a circulating pipeline, an alkali adding system is connected with the regeneration filtering device, and alkali liquor is added into the regeneration filtering device to adjust the pH of the liquid desulfurizer. The invention needs less equipment, has low investment cost and is convenient for control and maintenance.
Description
Technical Field
The invention relates to the technical field of natural gas treatment, in particular to a natural gas wet desulphurization device and method for removing hydrogen sulfide in natural gas based on a direct conversion method.
Background
The removal of hydrogen sulfide from natural gas by a direct conversion method is one of the conventional processes for wet-process natural gas desulfurization. The method is generally used for medium-sized and large-sized natural gas desulfurization systems, the desulfurization capacity is generally 1-25 t/d, the minimum treatment capacity is not less than 100kg/d, the systems are relatively complex, the investment is relatively large, and the investment is generally more than 100 ten thousand yuan.
The principle of the method is that hydrogen sulfide in natural gas is absorbed by alkaline complex iron solution, elemental sulfur is generated after reaction, ferric iron is reduced to ferrous iron, then air is adopted to carry out flotation and regeneration on the reacted alkaline complex iron solution, the ferrous iron in the alkaline complex iron solution is oxidized to ferric iron, regeneration of the alkaline complex iron solution is realized, alkaline complex iron solution (hereinafter referred to as rich solution) rich in sulfur elemental substance is generated, and then the rich solution is filtered by plate-frame filter press and other filter pressing equipment. And circularly absorbing the hydrogen sulfide in the natural gas again by the regenerated and filtered alkaline complex iron solution.
The direct conversion desulfurization mainly comprises the following parts: 1) Natural gas desulfurization: the natural gas desulfurization process is mainly carried out to remove H contained in the natural gas 2 S, making the content of hydrogen sulfide lower than a standard value, and comprising a raw material gas separator, a filtering separator, a purification gas separator, a desulfurizing tower and other equipment; 2) A solution circulation module: the liquid desulfurizer is circulated, the commonly used solution is complex iron solution, and the complex iron solution is treated, stored and configured to absorb H 2 The rich solution of S is regenerated into lean solution which is recycled in the whole system after being processed. Comprises a flash tank, a barren liquor pump, a dosing device, a barren liquor tank, an underground tank stirrer, a liquid replenishing pump and the like;
3) Regeneration: absorb H 2 The rich solution of S is contacted with air in the module and is oxidized into lean solution again to recover the desulfurization performance, and the rich solution comprises equipment such as a regeneration tank and the like; 4) And (3) sulfur production: the sulfur foam is further processed, and a sulfur product is obtained after filtration and molding, and comprises a sulfur foam tank, a blower, a vacuum drum filter, an air compressor, a sulfur foam pump, a sulfur conveyor and other equipment.
The existing wet desulphurization process for removing the hydrogen sulfide in the natural gas by a direct conversion method is a relatively mature process in medium and large-scale desulphurization projects, and not less than 50 processes are used nationwide. The oil field crude oil gathering and transportation station has the particularity of desulfurization. The main body is as follows:
1) The desulfurization amount is small. The desulfurization amount of each natural gas desulfurization site is not more than 100kg/d, and the total sulfur amount of most sites is 1-5 kg/d.
2) Except for H 2 S also containsWith CO 2 。CO 2 The content is far greater than H 2 S。
3) Containing liquid hydrocarbons. The purification temperature is lower than the gas source temperature, and liquid hydrocarbon is generated in the purification process.
The existing desulfurization process used for less than 100kg/d is mainly a dry desulfurization process, namely, a solid desulfurizing agent is adopted to react with hydrogen sulfide in natural gas, and the solid desulfurizing agent is mainly divalent or trivalent iron. The use is difficult at present mainly because: (1) The waste desulfurizer is rich in ferrous sulfide and has pyrophoricity, and has safety risk when used in oil and gas stations; and (2) the solid hazardous waste is difficult to treat.
The existing wet-process natural gas desulfurization process has the following defects if used in a crude oil gathering and transportation station:
1. the equipment is multiple, the system is complex, and a set of natural gas desulfurization device generally comprises 10-30 devices;
2. the investment is large, generally not less than 100 ten thousand yuan;
3. because of a plurality of devices, a complex control system is required to be matched and professional personnel are required to maintain in order to realize automatic control and automatic operation; once equipment and a system have faults, the overhauling difficulty is high.
Disclosure of Invention
The invention aims to provide a natural gas wet desulphurization device and a natural gas wet desulphurization method, which are used for solving the problems in the prior art, and have the advantages of less required equipment, low investment cost and convenience for control, maintenance and repair.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a natural gas wet desulphurization device, which comprises an absorption flotation tower, a regeneration filtering device and an alkali adding system; the absorption flotation tower comprises a tower body, a natural gas aerator, a liquid-rich tank, a packing layer, a spraying device and a demisting layer are sequentially arranged in the tower body from bottom to top, a desulfurizer outlet and a circulating desulfurizer inlet are formed in the bottom of the tower body, a natural gas outlet is formed in the top of the tower body, the desulfurizer outlet is connected with the spraying device through a conveying pipeline, an absorption pump is arranged on the conveying pipeline, the liquid-rich tank is communicated with a deaerator through a liquid-phase communicating pipe, the top of the deaerator is communicated with the spraying device through a gas-phase communicating pipe, the inside of the tower body is located between the spraying device and the demisting layer, the bottom of the deaerator is connected with a regeneration filtering device through a liquid-rich outlet pipe, the regeneration filtering device enables the liquid-rich to recover desulfurization capacity to form a liquid desulfurizer capable of being used circularly and filter the liquid desulfurizer to obtain a sulfur simple substance, the regeneration filtering device is connected with the circulating desulfurizer inlet through a circulating pipe, a circulating pump is arranged on the circulating pipeline, and an alkali adding system is connected with the regeneration filtering device and used for adding alkali liquor into the liquid desulfurizer capable of being used circularly to adjust the pH value of the liquid desulfurizer.
Preferably, the regenerative filtration device comprises a liquid storage tank and at least two filter bag groups, each filter bag group is arranged above the liquid storage tank and is respectively connected with the rich liquid outlet pipe through a rich liquid branch pipe, each rich liquid branch pipe is provided with a control valve, each filter bag group comprises a plurality of filter bags connected in parallel, and an inlet pipeline of each filter bag is provided with a filter bag adjusting valve.
Preferably, the system of adding alkali includes lye tank, lye pump, controller and pH meter, the lye tank passes through the lye pipe and connects the liquid reserve tank, the lye pump set up in on the lye pipe, the pH meter be used for detecting the pH of liquid in the liquid reserve tank and with controller communication connection.
Preferably, the spraying device comprises a plurality of nozzles, and the nozzles are uniformly distributed in the same plane in the tower body.
Preferably, a rich liquid level sensor is arranged in the rich liquid tank, and a rich liquid control valve is arranged on the rich liquid outlet pipe.
Preferably, a circulating liquid level sensor is arranged in the liquid storage tank.
The invention also provides a natural gas wet desulphurization method, which is based on the natural gas wet desulphurization device and comprises the following steps: the natural gas enters a liquid phase space with a liquid desulfurizer in the tower body through the natural gas aerator, hydrogen sulfide in the natural gas reacts with the liquid desulfurizer to generate elemental sulfur, ferric iron in the liquid desulfurizer is reduced to ferrous iron, and meanwhile, the liquid desulfurizer forms rich liquid rich in the elemental sulfur through natural gas flotation; rich solution enters the rich solution tank, enters the deaerator through the liquid phase communicating pipe for deaeration, enters a gas phase space above a liquid phase space in the tower body through the gas phase communicating pipe for deaerating, enters the regeneration filtering device through the rich solution outlet pipe for treatment to obtain a recyclable liquid desulfurizer, is filtered to obtain a sulfur simple substance, and circularly introduces the recyclable liquid desulfurizer into the liquid phase space through the circulating pump to continuously participate in reaction after the pH of the recyclable liquid desulfurizer is adjusted by the alkali adding system; the natural gas leaving the liquid surface of the liquid desulfurizer continuously goes upward, is subjected to desulfurization absorption by the liquid desulfurizer sprayed by the packing layer and the spraying device in sequence, is demisted by the demisting layer together with the removed gas, and then flows out from the natural gas outlet.
Compared with the prior art, the invention achieves the following technical effects:
the invention provides a natural gas wet desulphurization device and a method, wherein natural gas is used as a flotation medium, the natural gas enters a tower body through a natural gas aerator to be dispersed into small bubbles, liquid desulfurizer at the lower part of the tower body is floated to float out liquid desulfurizer rich in elemental sulfur, the rich liquid enters a rich liquid tank, the rich liquid enters a regeneration filtering device to be treated after being degassed by a degasser, the rich liquid recovers the desulphurization capability to form desulfurizer which can be recycled, the desulfurizer can be filtered to obtain elemental sulfur, the pH of the liquid desulfurizer which can be recycled is adjusted by an alkali adding system, the liquid desulfurizer is recycled and introduced into the tower body to continuously participate in reaction, the natural gas leaving the liquid surface of the liquid desulfurizer continuously goes upwards, the natural gas is desulfurized and absorbed by the liquid desulfurizer sprayed by a packing layer and a spraying device in sequence, and then is demisted by a demisting layer together with the removed gas, and then flows out from a natural gas outlet, so that the natural gas which meets the standard is obtained. The invention integrates the absorption flotation process into the absorption flotation tower, accelerates the reaction of hydrogen sulfide and liquid desulfurizer while floating rich liquid, realizes multi-stage absorption and flotation in the same equipment, has less equipment required in the natural gas desulfurization process, low investment cost and convenient control, maintenance and repair.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, 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 that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a wet desulfurization device for natural gas according to the present invention;
in the figure: 100-natural gas wet desulphurization unit;
1-an absorption flotation tower, 101-a tower body, 102-a natural gas aerator, 103-a rich solution tank, 104-a packing layer, 105-a spraying device, 106-a demisting layer, 107-a desulfurizer outlet, 108-a circulating desulfurizer inlet, 109-a natural gas outlet, 110-a conveying pipeline, 111-an absorption pump, 112-a liquid phase communicating pipe, 113-a degasser, 114-a gas phase communicating pipe, 115-a rich solution outlet pipe, 116-a nozzle, 117-a rich solution control valve, 118-a liquid phase space, 119-a gas phase space and 120-a natural gas inlet;
2-regeneration filtering device, 201-liquid storage tank, 202-rich liquid branch pipe, 203-control valve, 204-filter bag, 205-filter bag regulating valve;
3-an alkali adding system, 301-an alkali liquor box, 302-an alkali liquor pump and 303-an alkali liquor pipe;
4-a circulation pipeline; 5-circulating pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide a natural gas wet desulphurization device and a natural gas wet desulphurization method, which are used for solving the problems in the prior art, and have the advantages of less required equipment, low investment cost and convenience for control, maintenance and repair.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1, the present embodiment provides a natural gas wet desulfurization apparatus 100, which includes an absorption flotation tower 1, a regeneration filtering device 2, and an alkali adding system 3; the absorption flotation tower 1 comprises a tower body 101, a natural gas aerator 102, a rich liquid tank 103, a packing layer 104, a spraying device 105 and a demisting layer 106 are sequentially arranged in the tower body 101 from bottom to top, a desulfurizer outlet 107 and a circulating desulfurizer inlet 108 are arranged at the bottom of the tower body 101, a natural gas outlet 109 is arranged at the top of the tower body 101, the desulfurizer outlet 107 is connected with the spraying device 105 through a conveying pipeline 110, an absorption pump 111 is arranged on the conveying pipeline 110, the rich liquid tank 103 is communicated with a deaerator 113 through a liquid phase communicating pipe 112, the top of the deaerator 113 is communicated with the interior of the tower body 101 between the spraying device 105 and the demisting layer 106 through a gas phase communicating pipe 114, the bottom of the deaerator 113 is connected with a regeneration filtering device 2 through a rich liquid outlet pipe 115, the rich liquid can recover desulfurization capability through the regeneration filtering device 2 to form a recyclable liquid desulfurizer and filter the liquid desulfurizer to obtain sulfur, the regeneration filtering device 2 is connected with the circulating pipeline 4 through the circulating pipeline 108, a circulating pump 5 is arranged on the circulating pipeline 4, an alkali liquor 3 is connected with the regeneration filtering device 2, and is used for adding the liquid desulfurizer capable of recycling to adjust the pH value of the liquid desulfurizer.
When the natural gas desulfurization tower is used, natural gas enters the tower body 101 from the natural gas inlet 120, is dispersed into small bubbles through the natural gas aerator 102, is subjected to flotation on a liquid desulfurizer at the lower part of the tower body 101, is floated to obtain a liquid desulfurizer rich in elemental sulfur, namely a rich solution, enters the rich solution tank 103, is degassed through the degasser 113, enters the regeneration filtering device 2 for treatment to obtain the recyclable liquid desulfurizer, is filtered to obtain the elemental sulfur, is subjected to pH adjustment of the recyclable liquid desulfurizer through the alkali adding system 3, is recycled and introduced into the tower body 101 to continue to react, the natural gas leaving the liquid surface of the liquid desulfurizer continues to go upwards, is subjected to desulfurization absorption by the liquid desulfurizer sprayed by the packing layer 104 and the spraying device 105 in sequence, is demisted through the demisting layer 106 together with the removed gas, and then flows out from the natural gas outlet 109, so that the natural gas meeting the standard is obtained. The device integrates the absorption flotation process in the absorption flotation tower, accelerates the reaction of hydrogen sulfide and liquid desulfurizer while floating out the rich solution, realizes multi-stage absorption and flotation in the same equipment, has less equipment required in the natural gas desulfurization process, has low investment cost, and is convenient for control and maintenance. And the treatment and filtration of the rich solution are realized through the regeneration filtering device, so that the rich solution recovers the desulfurization capability to circularly participate in the desulfurization reaction, and the sulfur simple substance can be obtained through filtration.
In this embodiment, the regenerative filtration device 2 includes a liquid storage tank 201 and at least two filter bag groups, each filter bag group is disposed above the liquid storage tank 201 and is connected to the rich liquid outlet pipe 115 through the rich liquid branch pipe 202, each rich liquid branch pipe 202 is provided with a control valve 203, each filter bag group includes a plurality of filter bags 204 connected in parallel, and each filter bag 204 is provided with a filter bag adjusting valve 205 on the inlet pipeline. Rich liquor is subjected to group control through a control valve 203 and a filter bag adjusting valve 205, and enters a filter bag 204 for filtration, wherein the filter bag 204 is a fine filter bag, each filter bag is in contact with air, and the filtered liquid desulfurizer is stored in a liquid storage tank 201 and then is circularly conveyed into the tower body 101 through a circulating pump 5; in the filtering process, the rich solution and the filtered liquid desulfurizer react with oxygen in the air, ferrous ions are oxidized into trivalent ions, and the liquid desulfurizer recovers the capability of absorbing hydrogen sulfide; the fine filter bags are controlled in groups, after one group is filtered, the other group is opened to filter the liquid inlet, the liquid desulfurizer in the inactive group of fine filter bags is continuously filtered out of the bags, the water content of the liquid desulfurizer is gradually reduced, the fine filter bags are designed to be used for 7-15 days, and the inactive filter bags are cleaned before switching, so that sulfur with low water content can be obtained. The functions of filtering rich liquid, recovering the desulfurization capability, storing the liquid desulfurizer, storing the elemental sulfur and the like are integrated in the regeneration filtering device 2, the structure is simple, the control is convenient, and the investment cost is reduced. The regeneration filter device 2 is configured to contact the desulfurizing agent with air while filtering with the filter bag 204, and to absorb oxygen in the air to realize a regeneration function while filtering.
In this embodiment, the alkali adding system 3 includes an alkaline solution tank 301, an alkaline solution pump 302, a controller and a pH meter, the alkaline solution tank 301 is connected with the liquid storage tank 201 through an alkaline solution pipe 303, the alkaline solution pump 302 is arranged on the alkaline solution pipe 303, and the pH meter is used for detecting the pH of the liquid in the liquid storage tank 201 and is in communication connection with the controller. The pH value of the liquid in the liquid storage tank 201 is detected through the pH meter, the pH meter can be a remote pH meter, when the pH value detected by the pH meter is lower than a set value, the controller controls the lye pump 302 to start, lye is added into the liquid storage tank 201, and when the pH value detected by the pH meter reaches a set upper limit value, the controller controls the lye pump 302 to stop.
In this embodiment, the spraying device 105 includes a plurality of nozzles 116, the plurality of nozzles 116 are uniformly distributed on the same plane in the tower body 101, and the liquid desulfurizer at the bottom of the tower body 1 is pumped by the absorption pump 111, pressurized, and sprayed downward from the nozzles 116 to mix with the natural gas flowing upward for reaction, so as to further absorb the hydrogen sulfide therein.
In this embodiment, a rich liquid level sensor is disposed in the rich liquid tank 103, a rich liquid control valve 117 is disposed on the rich liquid outlet pipe 115, when the rich liquid level sensor detects that the liquid level in the rich liquid tank 103 is at a high liquid level, the rich liquid control valve 117 is opened, the rich liquid is transported to the regeneration filter device 2 through the rich liquid outlet pipe 115 for processing, and when the rich liquid level sensor detects that the liquid level in the rich liquid tank 103 is at a low liquid level, the rich liquid control valve 117 is closed.
In this embodiment, be equipped with circulation liquid level sensor in the liquid reserve tank 201, detect liquid level in the liquid reserve tank 201 when low as circulation liquid level sensor and report to the police excessively to can in time remind the staff.
The invention also provides a natural gas wet desulphurization method, which uses the natural gas wet desulphurization device 100: the natural gas enters a liquid phase space 118 filled with a liquid desulfurizer in the tower body 101 through a natural gas aerator 102, hydrogen sulfide in the natural gas reacts with the liquid desulfurizer to generate elemental sulfur, ferric iron in the liquid desulfurizer is reduced into ferrous iron, and meanwhile, the liquid desulfurizer forms rich liquid rich in the elemental sulfur through natural gas flotation; the rich solution enters a rich solution tank 103, enters a deaerator 113 through a liquid phase communicating pipe 112 for deaeration, the removed gas enters a gas phase space 119 above a liquid phase space 118 in the tower body 101 through a gas phase communicating pipe 114, the deaerated rich solution enters a regeneration filtering device 2 through a rich solution outlet pipe 115 for treatment to obtain a recyclable liquid desulfurizer, the liquid desulfurizer is filtered to obtain a sulfur simple substance, the pH of the recyclable liquid desulfurizer is adjusted through an alkali adding system 3, and the recyclable liquid desulfurizer is circularly introduced into the liquid phase space 118 through a circulating pump 5 to continuously participate in the reaction; the natural gas leaving the liquid surface of the liquid desulfurizer goes upward continuously, passes through the packing layer 104 and the spraying device 105 in sequence, is sprayed by the liquid desulfurizer, is subjected to desulfurization absorption, is demisted by the demisting layer 106 together with the removed gas, and then flows out from the natural gas outlet 109.
The natural gas wet desulphurization device has the advantages of less adopted equipment, simple control, small investment, small occupied area, skid-mounted realization, convenient maintenance, common field treatment when a fault occurs, and only 7-20 days for normal operation to clean the sulfur in the filter bag. The natural gas wet desulphurization device is adopted for carrying out natural gas desulphurization treatment, and the content of hydrogen sulfide in the treated natural gas can be lower than 20mg/m 3 And the standard requirement is met.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A natural gas wet desulphurization device is characterized in that: comprises an absorption flotation tower, a regeneration filtering device and an alkali adding system; the absorption flotation tower comprises a tower body, a natural gas aerator, a liquid-rich tank, a packing layer, a spraying device and a demisting layer are sequentially arranged in the tower body from bottom to top, a desulfurizer outlet and a circulating desulfurizer inlet are formed in the bottom of the tower body, a natural gas outlet is formed in the top of the tower body, the desulfurizer outlet is connected with the spraying device through a conveying pipeline, an absorption pump is arranged on the conveying pipeline, the liquid-rich tank is communicated with a deaerator through a liquid-phase communicating pipe, the top of the deaerator is communicated with the spraying device through a gas-phase communicating pipe, the inside of the tower body is located between the spraying device and the demisting layer, the bottom of the deaerator is connected with a regeneration filtering device through a liquid-rich outlet pipe, the regeneration filtering device enables the liquid-rich to recover desulfurization capacity to form a liquid desulfurizer capable of being used circularly and filter the liquid desulfurizer to obtain a sulfur simple substance, the regeneration filtering device is connected with the circulating desulfurizer inlet through a circulating pipe, a circulating pump is arranged on the circulating pipeline, and an alkali adding system is connected with the regeneration filtering device and used for adding alkali liquor into the liquid desulfurizer capable of being used circularly to adjust the pH value of the liquid desulfurizer.
2. The natural gas wet desulfurization apparatus according to claim 1, characterized in that: the regeneration filtering device comprises a liquid storage tank and at least two filtering bag groups, wherein each filtering bag group is arranged above the liquid storage tank and is respectively connected with a rich liquid outlet pipe through a rich liquid branch pipe, a control valve is arranged on each rich liquid branch pipe, each filtering bag group comprises a plurality of filtering bags connected in parallel, and a filtering bag adjusting valve is arranged on an inlet pipeline of each filtering bag.
3. The natural gas wet desulfurization apparatus according to claim 2, characterized in that: the alkali adding system comprises an alkali liquor tank, an alkali liquor pump, a controller and a pH meter, wherein the alkali liquor tank is connected with the liquid storage tank through an alkali liquor pipe, the alkali liquor pump is arranged on the alkali liquor pipe, and the pH meter is used for detecting the pH of liquid in the liquid storage tank and is in communication connection with the controller.
4. The natural gas wet desulfurization apparatus according to claim 1, characterized in that: the spraying device comprises a plurality of nozzles, and the nozzles are uniformly distributed on the same plane in the tower body.
5. The natural gas wet desulfurization apparatus according to claim 1, characterized in that: and a rich liquid level sensor is arranged in the rich liquid groove, and a rich liquid control valve is arranged on the rich liquid outlet pipe.
6. The natural gas wet desulfurization apparatus according to claim 2, characterized in that: and a circulating liquid level sensor is arranged in the liquid storage tank.
7. A natural gas wet desulfurization method based on the natural gas wet desulfurization apparatus according to any one of claims 1 to 6, characterized in that: the natural gas enters a liquid phase space with a liquid desulfurizer in the tower body through the natural gas aerator, hydrogen sulfide in the natural gas reacts with the liquid desulfurizer to generate elemental sulfur, ferric iron in the liquid desulfurizer is reduced to ferrous iron, and meanwhile, the liquid desulfurizer forms rich liquid rich in the elemental sulfur through natural gas flotation; rich solution enters the rich solution tank, enters the deaerator through the liquid phase communicating pipe for deaeration, enters a gas phase space above a liquid phase space in the tower body through the gas phase communicating pipe for deaerating, enters the regeneration filtering device through the rich solution outlet pipe for treatment to obtain a recyclable liquid desulfurizer, is filtered to obtain a sulfur simple substance, and circularly introduces the recyclable liquid desulfurizer into the liquid phase space through the circulating pump to continuously participate in reaction after the pH of the recyclable liquid desulfurizer is adjusted by the alkali adding system; the natural gas leaving the liquid surface of the liquid desulfurizer continuously goes upward, is subjected to desulfurization absorption by the liquid desulfurizer sprayed by the packing layer and the spraying device in sequence, is demisted by the demisting layer together with the removed gas, and then flows out from the natural gas outlet.
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| CN215440345U (en) * | 2021-08-30 | 2022-01-07 | 四川西油致诚石油技术有限公司 | Novel natural gas desulfurization process device |
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