CN108421400B - Online-regeneration biogas dry-method desulfurization device and desulfurization method thereof - Google Patents
Online-regeneration biogas dry-method desulfurization device and desulfurization method thereof Download PDFInfo
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- 238000011069 regeneration method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 28
- 238000006477 desulfuration reaction Methods 0.000 title claims description 25
- 230000023556 desulfurization Effects 0.000 title claims description 25
- 230000008929 regeneration Effects 0.000 claims abstract description 40
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000001105 regulatory effect Effects 0.000 claims abstract description 27
- 230000003009 desulfurizing effect Effects 0.000 claims description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 238000005192 partition Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 230000001172 regenerating effect Effects 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical group O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical class O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- KAEAMHPPLLJBKF-UHFFFAOYSA-N iron(3+) sulfide Chemical compound [S-2].[S-2].[S-2].[Fe+3].[Fe+3] KAEAMHPPLLJBKF-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- B01D53/81—Solid phase processes
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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
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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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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Abstract
The invention relates to a biogas dry desulphurization device capable of on-line regeneration, which comprises a dry desulphurization tower main body, an on-line regeneration device and a PLC (programmable logic controller), wherein the on-line regeneration device comprises an air inlet pipe and an electronic thermometer, the air inlet pipe is communicated with a biogas inlet pipe, the inlet end of the air inlet pipe is connected with an air compressor, the air inlet pipe is sequentially provided with a plurality of air flow meters, electric regulating valves and air one-way valves, the electronic thermometers are arranged at different positions of a desulfurizer filling area, and the biogas flow meters, a gas detector, the air flow meters, the electric regulating valves, the electronic thermometers and the air compressor are all connected with the PLC. The biogas dry desulphurization device provided by the invention realizes online regeneration of the iron oxide desulfurizer in the dry desulphurization device, prolongs the service life of the desulfurizer by 3-4 times, saves the cost of the desulfurizer, simultaneously realizes automatic operation, avoids safety risks caused by improper operation, and provides a guarantee for utilization of biogas.
Description
Technical Field
The invention relates to a biogas dry desulphurization device capable of being regenerated on line and a desulphurization method thereof, belonging to the technical field of dry desulphurization.
Background
Biogas is a combustible gas produced by the fermentation of various organic substances in the absence of air (reducing conditions) and at a suitable temperature and pH value by microorganisms. The biogas belongs to secondary energy and is renewable energy, the heat productivity of the biogas per cubic meter is about 20800-23600 kilojoules, which is equivalent to the heat provided by 0.7 kg of anthracite, so the biogas is a good energy source. The main components of the biogas comprise: 50% -80% methane (CH)4) 20% -40% of carbon dioxide (CO)2) 0% -5% nitrogen (N)2) Less than 1% hydrogen (H)2) Less than 0.4% oxygen (O2) and 0.1% -3% hydrogen sulfide (H)2S), and the like. At present, the biogas generated in industrial production is mostly from the anaerobic fermentation process to generate biogas IThe device is generally used for generating electricity, and generating steam or hot water by burning methane or a methane boiler for plant use.
Because the biogas contains a certain amount of hydrogen sulfide, the hydrogen sulfide has a strong corrosion effect, and if the hydrogen sulfide enters a biogas boiler or a generator, the inner wall of equipment is easily corroded, so that equipment damage or safety accidents are caused. Therefore, before the biogas is used, desulfurization treatment is required, and the content of hydrogen sulfide in the biogas is less than 100ppm generally before the biogas enters a biogas boiler or a generator.
In order to ensure the biogas desulfurization effect, a dry desulfurization tower device is needed. The dry desulfurization utilizes a desulfurizing agent to adsorb or react hydrogen sulfide for removal. The main component of the currently used dry desulfurizing agent is ferric oxide, which can operate at normal temperature and normal pressure, the removal efficiency of hydrogen sulfide can reach more than 90%, and simultaneously, the dry desulfurizing agent also has a certain removal effect on thiol organic sulfur and most nitrogen oxide compounds. The method has the advantages of simple equipment, convenient operation and small desulfurizer resistance in the using process, and is the most used biogas desulfurization method at present because iron oxide resources are rich and the price is low and the method has obvious advantages in the biogas fine desulfurization process. The desulfurization formula is as follows:
Fe2O3+3H2S＝Fe2S3+3H2O
Fe2O3+3H2S＝2FeS+3H2O
Fe2O3+FeS＝3FeO+S
the biogas is contacted with a dry desulfurizing agent in a dry desulfurizing device so as to be removed. However, when the content of iron oxide in the desulfurizer reaches more than 30%, the desulfurizer cannot be used continuously and needs to be regenerated for use. However, most of the using units cannot master the method for regenerating the iron oxide desulfurizer, and when the desulfurizer loses the effect, the desulfurizer can only be replaced, which causes waste of the desulfurizer. And if improper operation occurs in the desulfurizer replacement process and a large amount of air is contacted, violent heat release can be caused, and potential safety hazards are brought. Patent application publication No. CN104923076A, title of invention: a safe and pollution-free regeneration method of a spent ferric oxide desulfurizer mainly comprises the following steps: to contain failureIntroducing inert gas into a dry desulfurization tower of the iron oxide desulfurizer for replacement; introducing mixed gas consisting of oxygen-containing gas and inert gas after replacement, and carrying out regeneration reaction; introducing gas generated by the regeneration reaction into an absorption tower to react with Mg (OH)2And (3) solution reaction, namely introducing the reacted gas and the supplemented oxygen-containing gas into the dry desulfurization tower again for cyclic regeneration reaction. The method utilizes the inert gas to take away the heat generated during regeneration, thereby greatly reducing the risk of uncontrollable temperature caused by the strong exothermic process of the regeneration reaction; organic solvent is not needed, so that the cost is greatly reduced; the generated magnesium salt is Mg SO4No pollution is caused; the failure desulfurizer does not need to be disassembled from the dry desulfurization tower, so that the labor intensity of workers is reduced, and the working environment of the workers is improved; the regenerated desulfurizer has the desulfurization capability again, and a desulfurization system can be quickly put into operation. However, there are the following problems: the method needs to replace the methane contained in the methane by inert gas, and takes away the heat generated during regeneration by the inert gas, thereby greatly reducing the risk of uncontrollable temperature caused by the strong exothermic process of the regeneration reaction, along with high cost and complex process.
Disclosure of Invention
The invention provides a biogas dry desulphurization device capable of on-line regeneration and a desulphurization method thereof, which solve the problems of high cost, complex process and the like caused by the need of inert gas in the regeneration process of an oxidant in the conventional dry desulphurization device.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a biogas dry desulphurization device capable of on-line regeneration comprises a dry desulphurization tower main body, an on-line regeneration device and a PLC (programmable logic controller), wherein a plurality of layers of desulfurizer supporting partition plates are arranged inside the dry desulphurization tower main body, the dry desulphurization tower main body is divided into a plurality of desulfurizer filling areas by the desulfurizer supporting partition plates, iron oxide desulfurizer is filled in the desulfurizer filling areas, a biogas inlet pipe is arranged at the bottom of the dry desulphurization tower main body, a biogas one-way valve and a biogas flowmeter are sequentially arranged on the biogas inlet pipe, a biogas outlet and an exhaust port are arranged at the top of the dry desulphurization tower main body, and a gas detector is arranged at the biogas outlet; the online regeneration device comprises an air inlet pipe and an online thermometer, the air inlet pipe is communicated with the biogas inlet pipe, the inlet end of the air inlet pipe is connected with the air compressor, the air inlet pipe is sequentially provided with an air flow meter, an electric regulating valve and an air one-way valve, the online thermometers are a plurality of and are arranged at different positions of a desulfurizer filling area, and the biogas flow meter, the gas detector, the air flow meter, the electric regulating valve, the online thermometer and the air compressor are all connected with the PLC.
Further, a preferred embodiment of the present invention is: the dry-type desulfurizing tower also comprises a dry-type desulfurizing tower base, a desulfurizing agent access hole and a water outlet.
Further, a preferred embodiment of the present invention is: the iron oxide desulfurizer is a yellow or brown yellow small cylinder, the diameter is 4-6mm, the length is 5-15mm, and the bulk density is 0.7-0.9 kg/L.
Further, a preferred embodiment of the present invention is: the main body of the dry-type desulfurizing tower adopts glass fiber reinforced plastic or stainless steel which can resist the temperature of more than 70 ℃.
Further, a preferred embodiment of the present invention is: the empty tower linear velocity of the dry desulfurizing tower main body is 0.2-0.4m/s, and the stacking height of the single-layer desulfurizing agent is 0.3-0.8 m.
The invention also provides a biogas dry desulphurization method capable of on-line regeneration, and the biogas dry desulphurization device adopting the biogas dry desulphurization method comprises the following steps:
(1) biogas enters a main body of the dry-type desulfurization tower through a biogas inlet pipeline, the biogas enters the main body tower, passes through a desulfurizer supporting partition plate and a desulfurizer filling area in sequence and is discharged through a biogas outlet, a gas detector measures the concentration of hydrogen sulfide and oxygen at the outlet, and when the content of hydrogen sulfide at the outlet is continuously higher than 100ppm for 1 hour, the desulfurizer is basically saturated and starts on-line regeneration;
(2) injecting air through an air inlet pipeline by an air compressor, regenerating the reacted desulfurizer by using oxygen in the air, wherein an air flow meter is used for metering air inflow, an electric regulating valve is used for regulating the air inflow, an online thermometer is used for measuring the temperature of the tower wall, when the temperature is higher than 50 ℃, a temperature sensor prepared by the online thermometer sends a 4-20mA signal to be transmitted to a PLC (programmable logic controller), the PLC controls a valve of an electromagnetic valve to be closed, the air inflow is reduced, the regeneration speed is delayed, when the temperature is lower, the opening degree of the valve of the electric regulating valve is increased, the regeneration speed is accelerated, the temperature can be set according to the field condition, and the discharged gas is introduced into sodium carbonate absorption liquid for absorption treatment;
(3) in the regeneration process, the opening of the electric regulating valve is controlled by temperature, when the electric regulating valve is opened for the first time, the opening degree of the electric regulating valve is controlled according to a biogas flow meter and is represented by air flow, the air flow is generally the biogas flow multiplied by the hydrogen sulfide concentration multiplied by 4/oxygen concentration, the count value of the air flow is smaller than the value whenever, the oxygen concentration detected by an outlet gas detector is smaller than 1%, and if the oxygen concentration is larger than 1%, the opening degree of the electromagnetic valve is reduced.
The invention has the beneficial effects that:
the biogas dry desulphurization device provided by the invention realizes online regeneration of the iron oxide desulfurizer in the dry desulphurization device, prolongs the service life of the desulfurizer by 3-4 times, saves the cost of the desulfurizer, simultaneously realizes automatic operation, avoids safety risks caused by improper operation, and provides a guarantee for utilization of biogas. The device provided by the invention realizes the online regeneration of the iron oxide desulfurizer simply by adding the online thermometer, the electric regulating valve, the air one-way valve and the air compressor, and has the advantages of simple structure and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
in the figure, 1, a biogas inlet pipeline; 2. a methane one-way valve; 3. a biogas flow meter; 4. an air compressor; 5. an air flow meter; 6. an electric control valve; 7. an air intake duct; 8. an air check valve; 9. a dry desulfurization tower base; 10. a desulfurizer supporting partition plate; 11. a desulfurizer manhole; 12. a desulfurizer filling area; 13. a dry desulfurization tower main body; 14. an online thermometer; 15. a biogas outlet; 16. an exhaust port; 17. a gas detector; 18. a water outlet; 19. a PLC controller.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A biogas dry desulphurization device capable of on-line regeneration comprises a dry desulphurization tower main body 13, an on-line regeneration device and a PLC (programmable logic controller) 19, wherein a plurality of layers of desulfurizer supporting partition plates are arranged inside the dry desulphurization tower main body 13, the dry desulphurization tower main body 13 is divided into a plurality of desulfurizer filling areas 12 by the desulfurizer supporting partition plates 10, iron oxide desulfurizer is filled in the desulfurizer filling areas 12, a biogas inlet pipe is arranged at the bottom of the dry desulphurization tower main body 13, a biogas check valve 2 and a biogas flowmeter 3 are sequentially arranged on the biogas inlet pipe, a biogas outlet 15 and an exhaust port 16 are arranged at the top of the dry desulphurization tower main body 13, and a gas detector 17 is arranged at the biogas outlet 15; the online regeneration device comprises an air inlet pipe and an online thermometer 14, wherein the air inlet pipe is communicated with the biogas inlet pipe, the inlet end of the air inlet pipe is connected with an air compressor 4, an air flow meter 5, an electric regulating valve 6 and an air one-way valve 8 are sequentially arranged on the air inlet pipe, the online thermometers 14 are arranged at different positions of a desulfurizer filling area 12, and the biogas flow meter 3, a gas detector 17, the air flow meter 5, the electric regulating valve 6, the online thermometer 14 and the electric regulating valve 6 are all connected with a PLC 19.
In this embodiment, there are two desulfurizing agent supporting partition plates 10, the main body 13 of the dry desulfurizing tower is divided into two desulfurizing agent filling areas 12 by the two desulfurizing agent supporting partition plates 10, and two electronic thermometers 14 are disposed on the upper portions of the desulfurizing agent filling areas 12.
The dry-type desulfurizing tower also comprises a dry-type desulfurizing tower base 9, a desulfurizing agent access hole 11 and a water outlet 18.
The ferric oxide desulfurizer is a yellow or brown yellow small cylinder with the diameter of 4-6mm, the length of 5-15mm and the bulk density of 0.7-0.9 kg/L.
The main body 13 of the dry-type desulfurizing tower is made of glass fiber reinforced plastics or stainless steel which can resist the temperature of more than 70 ℃.
The empty linear velocity of the main body 13 of the dry desulfurizing tower is 0.2-0.4m/s, and the stacking height of the single-layer desulfurizing agent is 0.3-0.8 m.
The purpose of the methane one-way valve is to prevent gas from returning, and the methane flow meter is used for monitoring the air inlet flow so as to calculate the air inlet flow. After the methane enters the main tower. The desulfurizer supporting partition plate has the functions of supporting the filling of the desulfurizer to fix the desulfurizer, and also has the function of uniformly distributing the biogas to avoid local short flow; the desulfurizer filling area is mainly filled with an iron oxide desulfurizer which is a yellow or brownish yellow small cylinder, the diameter of the iron oxide desulfurizer is about 4-6mm, the length of the iron oxide desulfurizer is 5-15mm, the stacking density of the iron oxide desulfurizer is 0.7-0.9kg/L, and the filling amount and the filling area are determined according to the designed biogas air input and the hydrogen sulfide removal amount. The dry-type desulfurizing tower base purpose is to guarantee that the desulfurizing tower structure is firm, can increase the enhancement post etc. according to the structural requirement when the design. The purpose of the desulfurization tower access hole is to fill a desulfurizing agent and carry out the maintenance arrangement in the tower, and the diameter is generally designed to be 600 mm. The exhaust port should be in long term closure. The gas detector is used for measuring the concentration of outlet hydrogen sulfide and the concentration of oxygen, and when the outlet hydrogen sulfide content is higher than 100ppm continuously for 1 hour, the desulfurizing agent is basically saturated and needs to start on-line regeneration. The water discharged from the dry desulfurizing tower is discharged through a water outlet.
Example 2
A biogas dry desulphurization method capable of on-line regeneration adopts the biogas dry desulphurization device of the embodiment 1, and comprises the following steps:
(1) biogas enters a main body 13 of the dry-type desulfurizing tower through a biogas inlet pipeline 1, the biogas enters the main body tower, passes through a desulfurizing agent supporting partition plate 10 and a desulfurizing agent filling area 12 in sequence and is discharged through a biogas outlet 15, a gas detector 17 measures the concentration of hydrogen sulfide and oxygen at the outlet, and when the content of the hydrogen sulfide at the outlet is continuously higher than 100ppm for 1 hour, the desulfurizing agent is basically saturated and the on-line regeneration is started;
(2) air is injected through an air inlet pipeline 7 by an air compressor 4, oxygen in the air is used for regenerating the reacted desulfurizer, an air flow meter 5 is used for metering air inflow, an electric regulating valve 6 is used for regulating the air inflow, an electronic thermometer 14 is used for measuring the temperature of the tower wall, when the temperature is higher than 50 ℃, a temperature sensor prepared by the electronic thermometer 14 sends a 4-20mA signal to be transmitted to a PLC (programmable logic controller) 19, the PLC 19 controls the electric regulating valve to be closed, the air inflow is reduced, the regeneration speed is delayed, when the temperature is lower, the opening degree of the valve of the electric regulating valve 6 is increased, the regeneration speed is accelerated, the temperature can be set according to the field condition, and the discharged gas is introduced into sodium carbonate absorption liquid for absorption treatment;
(3) in the regeneration process, the electric regulating valve 6 is opened under the control of temperature, when the electric regulating valve is opened for the first time, the opening degree of the electric regulating valve is controlled according to the methane flow meter 3 and is represented by air flow, the air flow is generally the methane flow multiplied by the hydrogen sulfide concentration multiplied by 4/oxygen concentration, the numerical value of the air flow meter 5 is smaller than the numerical value whenever, and the outlet gas detector 17 detects that the oxygen concentration is smaller than 1 percent, if the oxygen concentration is larger than 1 percent, the opening degree of the electromagnetic valve is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A biogas dry desulphurization method capable of on-line regeneration is characterized in that a biogas dry desulphurization device capable of on-line regeneration is adopted, and the device comprises a dry desulphurization tower main body (13), an on-line regeneration device and a PLC (programmable logic controller) (19);
a plurality of layers of desulfurizer supporting partition plates (10) are arranged inside the dry-type desulfurizing tower main body (13), the dry-type desulfurizing tower main body (13) is divided into a plurality of desulfurizer filling areas (12) by the desulfurizer supporting partition plates (10), and the desulfurizer filling areas (12) are filled with iron oxide desulfurizer; the iron oxide desulfurizer is a yellow or brown yellow small cylinder, the diameter is 4-6mm, the length is 5-15mm, and the bulk density is 0.7-0.9 kg/L;
a biogas inlet pipeline (1) is arranged at the bottom of the dry-type desulfurization tower main body (13), a biogas one-way valve (2) and a biogas flowmeter (3) are sequentially arranged on the biogas inlet pipeline (1), a biogas outlet (15) and an exhaust port (16) are arranged at the top of the dry-type desulfurization tower main body (13), and a gas detector (17) is arranged at the biogas outlet (15); the dry-type desulfurizing tower main body (13) adopts glass fiber reinforced plastic or stainless steel which can resist the temperature of more than 70 ℃;
the online regeneration device comprises an air inlet pipeline (7) and an online thermometer (14), wherein the air inlet pipeline (7) is communicated with the biogas inlet pipeline (1), the inlet end of the air inlet pipeline (7) is connected with the air compressor (4), the air inlet pipeline (7) is sequentially provided with a plurality of air flow meters (5), an electric regulating valve (6) and an air one-way valve (8), the online thermometers (14) are arranged at different positions of a desulfurizer filling area (12), and the biogas flow meters (3), the gas detector (17), the air flow meters (5), the electric regulating valve (6), the online thermometers (14) and the air compressor (4) are all connected with a PLC (19);
the dry-type desulfurizing tower also comprises a dry-type desulfurizing tower base (9), a desulfurizing agent access hole (11) and a water outlet (18);
the empty linear velocity of the dry-type desulfurizing tower main body (13) is 0.2-0.4m/s, and the stacking height of the single-layer desulfurizing agent is 0.3-0.8 m;
the method comprises the following steps:
(1) biogas enters a main body (13) of the dry-type desulfurization tower through a biogas inlet pipeline (1) which is sequentially provided with a biogas one-way valve (2) and a biogas flowmeter (3), the biogas enters the main body and then sequentially passes through a desulfurizer supporting partition plate (10) and a desulfurizer filling area (12) and then is discharged through a biogas outlet (15) arranged at the top of the main body (13) of the dry-type desulfurization tower, a gas detector (17) arranged at the biogas outlet (15) measures the concentration of hydrogen sulfide and oxygen at the outlet, when the content of hydrogen sulfide at the outlet is higher than 100ppm for 1 hour continuously, the desulfurizer is basically saturated, online regeneration is started, and the water discharged from the dry-type desulfurization tower is discharged through a water outlet (18);
(2) air is injected through an air inlet pipeline (7) of an air compressor (4) which is sequentially provided with an air flow meter (5), an electric control valve (6) and an air one-way valve (8), the oxygen in the air is used for regenerating the reacted desulfurizer, the air flow meter (5) is used for measuring the air inflow, the electric control valve (6) is used for adjusting the air inflow, the online thermometer (14) is used for measuring the temperature of the tower wall, when the temperature is higher than 50 ℃, a temperature sensor configured on the online thermometer (14) sends a 4-20mA signal to be transmitted to the PLC (19), the PLC (19) controls the closing of a valve of an electromagnetic valve, the air inflow is reduced, the regeneration speed is delayed, when the temperature is lower, the opening of the electric regulating valve (6) is increased, the regeneration speed is accelerated, the temperature can be set according to the field condition, and the discharged gas is introduced into sodium carbonate absorption liquid for absorption treatment;
(3) in the regeneration process, the opening of the electric regulating valve (6) is controlled by temperature, and when the electric regulating valve is opened for the first time, the opening of the electric regulating valve (6) is controlled according to the biogas flowmeter (3) and is represented by air flow;
the biogas flow meter (3) is arranged on the biogas inlet pipeline (1) and is used for monitoring the air inlet flow so as to calculate the air inlet flow;
the general air flow is the methane flow multiplied by the hydrogen sulfide concentration multiplied by 4/oxygen concentration, whenever the value of the air flow meter (5) is smaller than the value of the general air flow, the gas detector (17) arranged at the methane outlet (15) detects that the oxygen concentration is smaller than 1%, and if the oxygen concentration is larger than 1%, the opening degree of the electric control valve (6) is reduced.
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| CN111948332A (en) * | 2019-05-17 | 2020-11-17 | 福建福源凯美特气体有限公司 | Device for detecting and calculating sulfur capacity of desulfurizer |
| CN112107975A (en) * | 2020-08-24 | 2020-12-22 | 新兴铸管股份有限公司 | Desulfurization system regeneration air compression automatic control system |
| CN112226251A (en) * | 2020-09-28 | 2021-01-15 | 北京中科鸿飞环境工程技术有限公司 | Dry desulfurization system and method for fuel gas containing high-concentration sulfide |
| CN115382522A (en) * | 2022-08-24 | 2022-11-25 | 重庆赛迪热工环保工程技术有限公司 | Blast furnace gas desulfurizer regeneration system and method |
| CN117304993B (en) * | 2023-10-12 | 2024-05-24 | 中国华电科工集团有限公司 | Chain plate type biogas desulfurization device and method |
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