CN101831334B

CN101831334B - System for producing power fuel for agricultural machinery by adopting biogas methanation way

Info

Publication number: CN101831334B
Application number: CN2010102044256A
Authority: CN
Inventors: 孙河忠; 董利霞; 于志彦; 曹国顺
Original assignee: BAZHOU LIHUA GAS STORAGE AND TRANSPORTATION Co Ltd
Current assignee: LANGFANG HEZHONG NEW ENERGY TECHNOLOGY CO., LTD.
Priority date: 2010-06-21
Filing date: 2010-06-21
Publication date: 2013-03-20
Anticipated expiration: 2030-06-21
Also published as: CN101831334A

Abstract

The invention relates to a system for producing power fuel for agricultural machinery by adopting a biogas methanation way. The system comprises a feeding device, a fermentation tank, a gas storage tank, a desulfuration device, a gas compressor, a dewatering device, a decarburization tower, a decarburization liquid regeneration tower, a dehydrant regeneration device, a hot water boiler and a heat exchanger, wherein the dehydrant regeneration device comprises an air cooler, a steam-water separator, a circulating fan and an electric heater; the electric heater is arranged on a regenerated gas uplink pipeline; the first path of a regenerated gas downlink pipeline is communicated with the air cooler, the second path thereof is communicated with a tail gas pipeline, and the third path thereof is communicated with a reflux pipeline; the tail gas pipeline is communicated with a fuel inlet of the hot water boiler, a hot water outlet of the hot water boiler is communicated with the heat exchanger through a hot water pipeline, the heat exchanger is communicated with a feeding port of the fermentation tank, and a barren liquid inlet of the decarburization tower is communicated with a barren liquid outlet of the decarburization liquid regeneration tower through a barren liquid pipeline. The system integrates biogas production, biogas storage, biogas compression and biogas purification into a whole and can make biogas become gas fuel which can directly used for agricultural vehicles and equipment.

Description

The system of producing power fuel for agricultural machinery by adopting biogas methanation way

Technical field

The present invention relates to the production system of the power fuel of agri-vehicle, farm implements use, particularly utilize Methane Resources, be the system of farm implements, agricultural vehicle and other vehicle production power fuel.

Background technology

At present, agri-vehicle, farm implements use gasoline or diesel oil as power fuel mostly, also have part agri-vehicle, farm implements to use Sweet natural gas as power fuel, but gasoline, diesel oil, Sweet natural gas all are primary energy source, and be non-renewable, expensive, and pollute the environment.

A lot of countries all are faced with the dual-pressure of economic growth and environment protection in the world; seek substitute energy; change traditional fossil energy production and consumption mode, the reproducible clean energies such as development and use biomass energy all are significant to development and the environment protection of sustainability.

China is a large agricultural country, biological energy raw material is quite abundant, although the recovery approach of biomass energy is a lot, but carry out the analysis-by-synthesis contrast from energy transfer, material cycle and three aspects of the eubiosis as can be known, biogas fermentation is the most reasonable, most economical, the most efficient mode of biomass utilization.

The biomass materials such as agricultural crop straw, fowl and animal excrement, organic waste materials, municipal wastes can Biogas.Biogas be biomass material under the condition of secluding air, a kind of combustible gas that produces through the effect of methane fermentating microorganism.Methane fermentating microorganism is a general designation, comprises zymogenic bacteria, hydrogen-producing acetogens, consumption hydrogen acetogen, food producing hydrogen and methane bacterium, food acetic acid and methane producing bacterium five large monoids.Five large monoid bacteriums consist of a food chain, and from the physiological metabolism product of each group bacterium or their the activity impact on fermented liquid pH value, marsh gas fermentation processes can be divided into hydrolysis, produce sour and product methane three phases.

Yet, biogas is as a kind of product, its level of quality is very low, only can be used for the purposes such as agricultural cooking fuel, if do not make the purifying processing treatment, biogas can not directly act as a fuel for agri-vehicle, farm implements, although the main component of biogas is methane, but also contain some impurity, such as moisture, hydrogen sulfide, carbonic acid gas, hydrogen sulfide has stronger corrosive nature to pipeline valve and application apparatus.Moisture in the biogas and hydrogen sulfide acting in conjunction can be accelerated the corrosion of pipeline and valve, under meter, and hydrogen sulfide also can pollute atmosphere, and the content of carbon dioxide in methane is very large, can reduce the quality of fuel, also can so that transportation, carrying cost increase.

Existing equipment with biomass production biogas all is independently, function singleness, production efficiency is low, energy consumption is high, do not form industrialization, intensive production system, can not do subsequent disposal to biogas, can not remove the impurity such as moisture in the biogas, hydrogen sulfide, carbonic acid gas, make marsh gas purifying, purifying, methanation, can't directly act as a fuel for agri-vehicle, farm implements.

Summary of the invention

For addressing the above problem, the system that the purpose of this invention is to provide a kind of producing power fuel for agricultural machinery by adopting biogas methanation way, integrate biogas production, storage, compression, purification, realize biogas desulfurization, decarburization, dehydration, thereby make biogas become the geseous fuel that can be directly used in agri-vehicle, farm implements.

For achieving the above object, the present invention is by the following technical solutions:

A kind of system of producing power fuel for agricultural machinery by adopting biogas methanation way, by feeding device, fermentor tank, gas-holder, desulfurizer, gas compressor, dewatering unit, decarbonizing tower, the decarbonizing liquid regenerator column, the dewatering agent regenerating unit, hot water boiler, interchanger forms, it is characterized in that: the discharge port of feeding device is connected with the opening for feed on fermentor tank top through a feed liquid pipeline, the air outlet at fermentor tank top is connected through the inlet mouth of biogas pipeline with the gas-holder middle part, the liquid outlet of fermentor tank bottom is communicated with the fluid inlet of feeding device through natural pond liquid reflux line, the air outlet at gas-holder top is connected with the desulfurization uphill line, desulfurizer is by No. one, No. two digester composes in parallel, No. one, the top of No. two digesters is respectively arranged with No. one, two desulfurization inlet mouths, No. one, the bottom of No. two digesters is respectively arranged with No. one, two desulfurization air outlets, No. one, two desulfurization inlet mouths are respectively through No. one, No. two the desulfurization intake ducting is connected with the desulfurization uphill line, No. one, two desulfurization air outlets are respectively through No. one, No. two the desulfurization outlet pipe is connected with the descending pipeline of desulfurization, No. one the desulfurization air outlet is communicated with No. two desulfurization inlet mouths through a by-pass line, No. two the desulfurization air outlet is communicated with a desulfurization inlet mouth through No. two by-pass lines, the descending pipeline of desulfurization is connected with the inlet mouth of gas compressor, the descending pipeline of desulfurization also is connected with the fuel gas inlet of hot water boiler through No. three by-pass lines, the air outlet of gas compressor is connected with the descending pipeline of decarburization through the biogas bearing pipe, the descending pipeline of decarburization is connected with the inlet mouth of decarbonizing tower, the air outlet of decarbonizing tower is connected with the decarburization uphill line, the decarburization uphill line is connected with the dehydration uphill line, dewatering unit is by No. one, No. two water knockout composes in parallel, No. one, the top of No. two water knockouts is respectively arranged with No. one, No. two dehydration inlet mouths, No. one, the bottom of No. two water knockouts is respectively arranged with No. one, No. two dehydration air outlets, No. one, No. two dehydration inlet mouths are respectively through No. one, No. two the dehydration intake ducting is connected with the dehydration uphill line, No. one, No. two dehydration air outlets are respectively through No. one, No. two the dehydration outlet pipe is connected with the descending pipeline of dehydration, the dewatering agent regenerating unit is by air-cooler, steam separator, recirculation blower and electric heater form, the air outlet of air-cooler is communicated with the inlet mouth of steam separator, the air outlet of steam separator is connected with circulating line, circulating line is connected with the resurgent gases uphill line, recirculation blower is arranged on the circulating line, electric heater is arranged on the resurgent gases uphill line, No. one, No. two dehydration inlet mouths are respectively through No. four, No. five by-pass line is connected with the descending pipeline of resurgent gases, No. one, No. two dehydration air outlets are respectively through No. six, No. seven by-pass line is connected with the resurgent gases uphill line, the descending pipeline one tunnel of resurgent gases is communicated with the inlet mouth of air-cooler, another road is communicated with exhaust pipe, one the tunnel is communicated with reflux line again, exhaust pipe is communicated with the fuel gas inlet of hot water boiler, reflux line is communicated with the inlet mouth of gas compressor, the hot water outlet of hot water boiler is communicated with the tube side entrance of interchanger through hot water pipeline, the tube side outlet of interchanger is communicated with the water return outlet of hot water boiler through water return pipeline, the shell side outlet of interchanger is communicated with the opening for feed of fermentor tank through No. two feed liquid pipelines, the shell side entrance of interchanger is communicated with the discharge port of feeding device through No. three feed liquid pipelines, the lean solution import of decarbonizing tower is communicated with the lean solution outlet of decarbonizing liquid regenerator column through the lean solution pipeline, be provided with lean pump on the lean solution pipeline, the rich solution import of decarbonizing liquid regenerator column is communicated with the rich solution outlet of decarbonizing tower through the rich solution pipeline.

The present invention has following positive beneficial effect:

1. the present invention adopts stalk marsh gas, is crushed to 1-2cm after straw (fresh straw, dry straw all can) is collected, the sealing stack retting stores.The stalk that stack retting is good (the stack retting time is more than 30 days) drops into marsh-gas fermentation tank, and through acid-producing bacteria, methanobacteria effect, fermentation produces biogas, and its methane content 50-70% is stored in the biogas storage tank.

The agricultural crop straw Biogas has many advantages: stalk is widely distributed, and raw material is sufficient, can thoroughly solve biogas production raw material problem; The natural pond slag that produces is solid-state, can directly use as organic fertilizer, and natural pond liquid can be used for the moisture of next batch of fermentation material to be regulated, and does not have the discharging of natural pond liquid, meets the recycling economy requirement; But the stalk long storage, convenient transportation, price is more cheap; Can be at normal temperature, middle temperature bottom fermentation, energy input-output efficiency is high, is convenient to production management, is more suitable for production application; The product of stalk marsh gas is clean energy---biogas and organic fertilizer, do not produce harmful byproduct, and can realize the zero release of waste, the complete resource conversion of stalk and the efficient utilization of resource.Therefore, utilizing stalk is to realize that stalk is efficient, the effective way of clean utilization for raw material production biogas,

Can use at aspects such as family expenses fuel, marsh gas power generations after the desulfurization of biogas process, the dehydration; Through pressurization, be filled in gas tank, the air bag, the agricultural machinery and implement that can offer fixed operation short range operation use.

2. the present invention adopts the dry type desulfurizing method, and the method for desulfurization has the methods such as wet desulphurization, dry desulfurization, biological desulphurization.The dry removal hydrogen sulfide in methane is to utilize oxygen to make hydrogen sulfide (H ₂S) be oxidized to sulphur, namely in a container, put into sweetening agent, gas with low flow velocity from an end through the sweetening agent packing layer in the container, after Oxidation of Hydrogen Sulfide becomes sulphur or oxysulfide, reside in the packing layer, gas is discharged from the container the other end after purifying.

It is simple that dry desulfurization has technique, the advantage such as mature and reliable, cost are low, and can reach the degree of delivering goods preferably.Dry-desulphurizer has gac, zinc oxide, manganese oxide and ferric oxide etc.Gac is a kind of porous material, and its specific surface is large, adsorptivity is strong, can desulfurization, take off benzene, deodorization, decolouring, can also optionally remove some impurity atom in the gas phase, and the present invention adopts gac to make sweetening agent.

3. contain saturated steam from fermentation unit biogas out, the methods such as available cold partition method, solvent absorption, solid-state physics suction method are removed it.The present invention adopts calcium chloride as dewatering agent biogas to be dewatered, and the calcium chloride price is low, drying power is strong, rate of drying is fast, can regenerate, and is reusable.

4. decarbonization method commonly used has: the decarburization of PSA dry method, WATER-WASHING METHOD, propylene carbonate method, MDEA method, the decarburization of NHD method wet method etc.The present invention adopts the decarburization of NHD method wet method, and NHD is a kind of novel dissolvent, and its major ingredient is Polyethylene glycol dimethyl ether, and molecular formula is CH-O-(CH-CH ₂-O-) nCH, wherein n=2～8 are mixtures of alcohol ether, and NHD has good chemical property and thermostability, steam forces down, volatilization loss is few, does not degrade under working conditions, polymerization, with contact with air oxidation does not occur, nontoxic, can by other biological degradation, therefore, a large amount of liquid accidents of running of generation also not polluted the environment.The itself non-corrosiveness belongs to organic solvent, and certain oilness is arranged, and running device is had the lubrication protection effect, and the NHD zero pour is lower, can guarantee its normal use at lesser temps.Can be with the H in the biogas ₂S, CO ₂Physics Deng sour gas removes.The present invention adopts the NHD decarburization technique.Biogas can make methane content＞90%, calorific value＞33.4MJ m through further decarburization purification ³(8000kcal/m ³) refining biogas, the compression of compressed machine, be filled to the biogas storage tank, offer farm implements, agri-vehicle and other vehicle and use.

Description of drawings

Fig. 1 is system principle structural representation of the present invention.

Fig. 2 is the internal structure synoptic diagram of fermentor tank.

Fig. 3 is the internal structure synoptic diagram of gas-holder.

Fig. 4 is the internal structure synoptic diagram of digester.

Fig. 5 is the internal structure synoptic diagram of water knockout.

Fig. 6 is the internal structure synoptic diagram of decarbonizing tower.

Fig. 7 is the internal structure synoptic diagram of decarbonizing liquid regenerator column.

Embodiment

Number in the figure

1 feeding device, 101 opening for feeds, 102 discharge ports, 103 fluid inlets

2 fermentor tanks, 201 opening for feeds, 202 air outlets

203 slag notches, 204 liquid outlets, 205 gas storage districts, 206 fermentation zones

Slag district, 207 natural pond 208 marsh liquid regions, 209 spargers

3 gas-holder, 301 inlet mouths, 302 air outlets, 303 leakage fluid drams

4 digesters

401 desulfurization inlet mouths, 402 desulfurization air outlets, 403 tank bodies

404 end sockets, 405 spigot discharges, 406 double-edged fine-toothed combs, 407 gacs

5 digesters

501 desulfurization inlet mouths, 502 desulfurization air outlets

6 water knockouts, 601 dehydration inlet mouths (resurgent gases outlet)

602 dehydration air outlets (resurgent gases import)

603 tank bodies, 604 end sockets, 605 spigot discharges, 606 double-edged fine-toothed combs

The 608 outer insulations of 607 Calcium Chloride Powder Anhydrouss

7 water knockouts, 701 dehydration inlet mouths, 702 dehydration air outlets

8 decarbonizing towers, 801 inlet mouths, 802 air outlets

803 lean solution imports, 804 rich solutions export 805 main bodys

806 manholes, 807 double-edged fine-toothed combs, 808 packing rings

809 mouth sprays, 810 rich solutions, 811 external thermal insulations

9 decarbonizing liquid regenerator columns

901 rich solution imports, 902 lean solutions export 903 air intlets, 904 discharge outlets

905 main bodys, 906 manholes, 907 double-edged fine-toothed combs, 908 packing rings

909 mouth sprays, 910 lean solutions, 911 external thermal insulations

The outlet of 11 air-coolers, 111 resurgent gases imports, 112 resurgent gaseses

12 steam separator 121 resurgent gases imports, 122 resurgent gaseses export 123 leakage fluid drams

13 recirculation blowers

The outlet of 14 electric heaters, 141 resurgent gases imports, 142 resurgent gaseses

15 natural pond liquid reflux lines 16 pipeline 17 blower fans 18 lean pumps of slagging tap

19 hot water boilers, 191 fuel gas inlet, 192 hot water outlets, 193 water return outlets

20 feed liquid pipelines

21 gas compressors, 211 inlet mouths, 212 air outlets

The outlet of 22 interchanger, 221 shell side entrances, 222 shell sides

The outlet of 223 tube side imports, 224 tube sides

23 feed liquid pipelines, 24 biogas pipelines

The descending pipeline of 25 desulfurization uphill lines, 26 desulfurization

The descending pipeline 29 decarburization uphill lines of 27 biogas bearing pipes, 28 decarburizations

The descending pipeline of 30 dehydration uphill lines, 31 dehydrations

32 feed liquid pipelines, 33 by-pass lines, 34 by-pass lines

The descending pipeline 36 resurgent gases uphill lines of 35 resurgent gaseses

38 resurgent gaseses are replenished pipeline 39 exhaust pipes 40 reflux lines

41 desulfurization intake ductings, 42 desulfurization outlet pipes

43 exhausting pipelines, 44 lean solution pipelines, 45 rich solution pipelines

46 air lines, 47 Drainage pipes, 48 circulating lines

51 desulfurization intake ductings, 52 desulfurization outlet pipes

57 biogas pipelines, 58 hot water pipelines, 59 water return pipelines

60 Drainage pipes, 61 dehydration intake ductings, 62 dehydration outlet pipes

63 by-pass lines, 64 by-pass lines

71 dehydration intake ductings, 72 dehydration outlet pipes

73 by-pass lines, 74 by-pass lines

Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, the present invention is a kind of system of producing power fuel for agricultural machinery by adopting biogas methanation way, formed by feeding device 1, fermentor tank 2, gas-holder 3, desulfurizer, gas compressor 21, dewatering unit, decarbonizing tower 8, decarbonizing liquid regenerator column 9, dewatering agent regenerating unit, hot water boiler 19, interchanger 22, it is characterized in that:

The discharge port 102 of feeding device 1 is connected with the opening for feed 201 on fermentor tank 2 tops through a feed liquid pipeline 23, the air outlet 202 at fermentor tank 2 tops is connected with the inlet mouth 301 at gas-holder 3 middle parts through biogas pipeline 24, the liquid outlet 204 of fermentor tank 2 bottoms is communicated with the fluid inlet 103 of feeding device 1 through natural pond liquid reflux line 15, the air outlet 302 at gas-holder 3 tops is connected with desulfurization uphill line 25

Desulfurizer is composed in parallel by No. one, No. two

digesters

4,5, No. one, No. two

digesters

4,5 top are respectively arranged with No. one, two desulfurization inlet mouths 401,501, No. one, No. two

digesters

4,5 bottom are respectively arranged with No. one, two desulfurization air outlets 402,502

No. one, two desulfurization inlet mouths 401,501 are connected with desulfurization uphill line 25 through No. one, No. two

desulfurization intake ductings

41,51 respectively,

No. one, two desulfurization air outlets 402,502 are connected with the descending pipeline 26 of desulfurization through No. one, No. two

desulfurization outlet pipes

42,52 respectively,

No. one desulfurization air outlet 402 is communicated with No. two desulfurization inlet mouths 501 through a by-pass line 33,

No. two desulfurization air outlet 502 is communicated with a desulfurization inlet mouth 401 through No. two by-pass lines 34,

The descending pipeline 26 of desulfurization is connected with the inlet mouth 211 of gas compressor 21, and the descending pipeline 26 of desulfurization also is connected with the fuel gas inlet 191 of hot water boiler 19 through No. three by-pass lines 57,

The air outlet 212 of gas compressor 21 is connected with the descending pipeline 28 of decarburization through biogas bearing pipe 27, and the descending pipeline 28 of decarburization is connected with the inlet mouth 801 of decarbonizing tower 8, and the air outlet 802 of decarbonizing tower 8 is connected with decarburization uphill line 29,

Decarburization uphill line 29 is connected with dehydration uphill line 30,

Dewatering unit is composed in parallel by No. one, No. two water knockouts 6,7, No. one, No. two water knockouts 6,7 top are respectively arranged with No. one, No. two dehydration inlet mouths 601,701, No. one, No. two water knockouts 6,7 bottom are respectively arranged with dehydration air outlet 602,702 No. one, No. two

No. one, No. two dehydration inlet mouths 601,701 are connected with dehydration uphill line 30 through No. one, No. two

dehydration intake ductings

61,71 respectively,

No. one, No. two dehydration air outlets 602,702 are connected with the descending pipeline 31 that dewaters through No. one, No. two

dehydration outlet pipes

62,72 respectively,

The dewatering agent regenerating unit is comprised of air-cooler 11, steam separator 12, recirculation blower 13 and electric heater 14, the air outlet 112 of air-cooler 11 is communicated with the inlet mouth 121 of steam separator 12, the air outlet 122 of steam separator 12 is connected with circulating line 48, circulating line 48 is connected with resurgent gases uphill line 36, recirculation blower 13 is arranged on the circulating line 48, electric heater 14 is arranged on the resurgent gases uphill line 36

No. one, No. two dehydration inlet mouths 601,701 (resurgent gases outlets) are connected with the descending pipeline 35 of resurgent gases through No. four, No. five by-

pass lines

63,73 respectively,

No. one, No. two dehydration air outlets 602,702 (resurgent gases import) are connected with resurgent gases uphill line 36 through No. six, No. seven by-

pass lines

64,74 respectively,

The descending pipeline 35 one tunnel of resurgent gases is communicated with the inlet mouth 111 of air-cooler 11, and another road is communicated with exhaust pipe 39, and one the tunnel is communicated with reflux line 40 again,

Exhaust pipe 39 is communicated with the fuel gas inlet 191 of hot water boiler 19, and reflux line 40 is communicated with the inlet mouth 211 of gas compressor 21,

The hot water outlet 192 of hot water boiler 19 is communicated with the tube side entrance 223 of interchanger 22 through hot water pipeline 58,

The tube side outlet 224 of interchanger 22 is communicated with the water return outlet 193 of hot water boiler 19 through water return pipeline 59,

The shell side of interchanger 22 outlet 222 is communicated with the opening for feed 201 of fermentor tank 2 through No. two feed liquid pipelines 32,

The shell side entrance 221 of interchanger 22 is communicated with the discharge port 102 of feeding device 1 through No. three feed liquid pipelines 20,

The lean solution import 803 of decarbonizing tower 8 is communicated with the lean solution outlet 902 of decarbonizing liquid regenerator column 9 through lean solution pipeline 44, be provided with lean pump 18 on the lean solution pipeline 44, the rich solution import 901 of decarbonizing liquid regenerator column 9 is communicated with the rich solution outlet 804 of decarbonizing tower 8 through rich solution pipeline 45.

Principle of work of the present invention is as follows:

The stalk material that pulverize, stack retting is good adds in the feeding device 1 through opening for feed 101, through discharge port 102, feed liquid pipeline 23, add inner being equipped with in the fermentor tank 2 of biogas fermentation bacterium by opening for feed 201, please refer to Fig. 2, Fig. 3, act on the gas storage district 205 that fermentor tank middle part fermentation zone 206 produces biogas and concentrates on fermentor tank 2 tops through zymophyte, through the air outlet 202, biogas pipeline 24, enter the gas-holder 3 from gas-holder inlet mouth 301 and to store; The natural pond slag that produces is enriched in slag district, natural pond, fermentor tank bottom 207, discharges through slag notch 203, the pipeline 16 of slagging tap, and as fertilizer sources is sold outward; The natural pond liquid enrichment is in fermentor tank 2 bottom marsh liquid regions 208, is back in the feeding device 1 through liquid outlet 204, natural pond liquid reflux line 15, by natural pond liquid import 103 self-pressures to recycle.

Marsh-gas fermentation tank 2 is Steel Vessel, and leavening temperature is 40-50 ℃, and the fermentation pressure of self is 0.06-0.08MPa, vary in size depending on tank body, opening for feed 201 can be 3-5 or more, links to each other with sparger 209 in the tank body respectively, and sparger 209 plays the uniform distribution effect; Open different feeding lines, pump circulation according to fermentation situation in the tank; Prevent crust; Carry out part or whole heating according to temperature conditions in the tank, keep leavening temperature.

Sparger 209 is circular steel pipe, has a plurality of discharge holes on the pipe, to reach the equally distributed effect of feed liquid.

Gas-holder 3 is dry type, constant volume type Steel Vessel, and working pressure is 0.06-0.08MPa, relies on pressure change to store biogas.Container bottom is provided with leakage fluid dram 303, plays the free-water in the discharging biogas.

When cold snap uses native system to produce biogas, self heat production can not guarantee the leavening temperature requirement during fermentation, need heat, feed liquid in the feeding device 1 is through discharge port 102, feed liquid pipeline 20, entered in the feed liquid interchanger 22 by shell side entrance 221 and to heat, enter into fermentor tank 2 by shell side outlet 222, feed liquid pipeline 32 again.

The biogas heating is provided by hot water boiler 19, hot water boiler 19 uses self-produced biogas to act as a fuel, hot water is through hot water outlet 192, hot water pipeline 58, after entering the interchanger heating by the tube side import 223 of interchanger 22, through tube side outlet 224, water return pipeline 59, returned in the hot water boiler 19 by water return outlet 193.

The biogas that stores is through air outlet 302, the desulfurization uphill line 25 of gas-holder 3, entering inside by the desulfurization inlet mouth 401 (or 501) of digester 4 (or 5) is equipped with in the digester 4 (or 5) of gac 407, gac 407 uses as sweetening agent, under the katalysis of gac, the oxidized generation element sulphur of hydrogen sulfide in the biogas, reside in the digester 4 (or 5), thereby reach the purpose of desulfurization.

The adsorption of gac is a catalyzed reaction, and gac is as catalyzer, and the dioxygen oxidation that hydrogen sulfide is stored on the gac, the element sulphur of generation are adsorbed to (oxygen storage capacity of every 1g gac is about 600mg) on the gac.

Use active-carbon bed adsorption of hydrogen sulfide, can select single or double bed system.The advantage of double bed activated carbon system is: two adsorption bed tandem workings, and during first adsorption bed adsorption of hydrogen sulfide, second adsorption bed and inoperative.When first adsorption bed adsorbs when saturated, hydrogen sulfide can pass first adsorption bed, is adsorbed when entering second adsorption bed.When the hydrogen sulfide content of importing and exporting when first adsorption bed is identical, change the gac of first adsorption bed (digester 4).

Please refer to Fig. 4, the replacing method is: open digester end socket 404, open spigot discharge 405, to adsorb saturated gac 407 by spigot discharge 405 draws off and cleans out, closed discharging hole 405, new gac 407 evenly is contained on the double-edged fine-toothed comb 406 that is positioned at tank body 403 bottoms, sealing end socket 404 is finished replacing.After the replacing, new adsorption bed is as second adsorption bed work.

Adsorb in order to maximally utilise gac, the present invention selects the double bed system, the double bed system operating mode is: control by valve, biogas enters the first digester 4 by the first desulfurization inlet mouth 401, through the first desulfurization air outlet 402, by-pass line 33, enter the second digester 5 by the second desulfurization inlet mouth 501, through the second desulfurization air outlet 502, sent outside by the descending pipeline 26 of desulfurization; After changing gac, the biogas delivery conduit is: desulfurization uphill line 25, the second desulfurization inlet mouth 501, the second digester 5, the second desulfurization air outlet 502, by-pass line 34, the first desulfurization inlet mouth 401, the first digester 4, the first desulfurization air outlet 402, the descending pipeline 26 of desulfurization.

Biogas after the desulfurization is different as required, near being used for the place of production, during the little agricultural machinery and implement of activity scope, only needing to carry out processed to biogas and gets final product.Biogas enters the descending pipeline 26 of desulfurization through the second desulfurization air outlet 502 (or first desulfurization air outlet 402) of

digester

4 or 5, after entering compressor 21 pressurizations by the inlet mouth 211 of compressor 21, compressed machine air outlet 212, biogas bearing pipe 27 enter in the second dehydration inlet mouth 701 of the first dehydration inlet mouth 601 of the first water knockout 6 or the second water knockout 7.

The first water knockout 6 is identical with the second water knockout 7 internal structures, please refer to Fig. 5, dewatering agent is equipped with in the first water knockout 6 inside, dewatering agent is calcium chloride 607, by the water in the calcium chloride 607 absorption biogas to reach the purpose of dehydration, biogas after the dehydration is filled with biogas gas tank or air bag through the first dehydration air outlet 602, the descending pipeline 31 of dehydration, for the biogas agricultural machinery and implement.

Please refer to Fig. 5, the Calcium Chloride Powder Anhydrous filling method is: open water knockout end socket 604, open spigot discharge 605, cleaned out in waste and old calcium chloride and the tank behind the impurity by spigot discharge 605, closed discharging hole 605, new Calcium Chloride Powder Anhydrous 607 evenly is contained on the double-edged fine-toothed comb 606 that is positioned at tank body 603 bottoms by tank body 603 tops, sealing end socket 604 is finished filling.

The regeneration of calcium chloride is carried out about 200 ℃, therefore, water knockout 6,7 and up, the descending pipeline of resurgent gases need increase external thermal insulation 608.

At first, the biogas that drying is crossed replenishes pipeline 38, is sent in the electric heater 14 by the import of electric heater 14 and heat through the dehydration resurgent gases,

Resurgent gases after the heating is through resurgent gases uphill line 36, by-

pass line

64,74,

dehydration air outlet

602 or 702 by water knockout 6 or 7 enters in water knockout 6 or 7, dewatering agent to its inside carries out thermal regeneration, gas after the regeneration is discharged through

dehydration inlet mouth

601 or 701, through by-

pass line

63,73 enter in the descending pipeline 35 of resurgent gases, then cool off by air-cooler 11, steam separator 12 carries out gas-liquid separation, water coolant after the separation is by leakage fluid dram 123, Drainage pipe 60 dischargings, Gas reclamation gas enters in the circulating line 48 through resurgent gases outlet 122, by recirculation blower 13 pressurizations, recycle, finish until regenerate, thereby calcium chloride is reused.After regeneration is finished, resurgent gases is used as combustion gas through the fuel gas inlet 191 that exhaust pipe 39 enters hot water boiler 19, when hot water boiler 19 is stopped using, tail gas can return gas compressor 21 by reflux line 40 to be continued to utilize, when hot water boiler 19 gas consumptions strengthen, can replenish biogas to hot water boiler 19 by the descending pipeline 26 of desulfurization, by-pass line 57 and exhaust pipe 39.

When the agricultural machinery and implement distant when being applied to, that scope of activity is larger or agri-vehicle, reply biogas further carries out carbonization treatment, is beneficial to compression, conveying and easy to carry.

Biogas after the pressurization is through biogas bearing pipe 27, the descending pipeline 28 of decarburization, entered in the decarbonizing tower 8 by the inlet mouth 801 of decarbonizing tower 8, NHD decarbonizing liquid (lean solution) counter current contact good with regeneration, and carbonic acid gas is absorbed in the liquid phase to reach the purpose of decarburization.

Biogas air outlet 802 after the decarburization, decarburization uphill line 29, dehydration uphill line 30 enter dewatering system and dewater.Methane content in the refining biogas of process desulfurization, decarburization, dehydration can reach more than 90%, calorific value＞33.4MJ/m ³(8000kcal/m ³).Be filled with the facilities such as biogas gas tank, for biogas agricultural machinery and implement and other vehicle.

Please refer to Fig. 6, Fig. 7, the regeneration of NHD decarbonizing liquid is finished by decarbonizing liquid regenerator column 9, and air through air line 46, enters decarbonizing liquid regenerator column 9 by the air intlet 903 that is positioned at decarbonizing liquid regenerator column 9 bottoms through blower fan 17 pressurizations; Absorbed decarbonizing liquid (rich solution) 810 of carbonic acid gas through rich solution outlet 804, the rich solution pipeline 45 of decarbonizing tower 8 bottoms, enter decarbonizing liquid regenerator column 9 by the rich solution import 901 that is positioned at decarbonizing liquid regenerator column top, spray to filler 908 by rich solution mouth spray 909, contact with the air inversion that the bottom enters, carbonic acid gas is desorbed, and reclaims or discharging through discharge outlet 904, exhausting pipeline 43.Decarbonizing liquid after the desorb (lean solution) 910 concentrates on the regenerator column bottom, through lean solution outlet 902, lean solution pipeline 44, by lean pump 18 pressurizations, enter decarbonizing tower 8 by decarbonizing tower 8 lean solution imports 803 after the pressurization, to filler 808, absorbing carbon dioxide is finished circulation by mouth spray 809 sprays.

Please refer to Fig. 6, decarbonizing tower 8 is the steel packing tower, whole tower is comprised of main body 805, inlet mouth 801, air outlet 802, lean solution import 803, mouth spray 809, rich solution outlet 804, double-edged fine-toothed comb 807, packing ring 808 is housed in the decarbonizing tower 8, main body 805 is provided with 2 of manholes (or a plurality of), play a part into tower maintenance, loading and unloading filler, the main body outside is provided with external thermal insulation 811.Packing ring 808 is the filler of filling in the packing tower, works and increase gas-to-liquid contact, improves the effects such as mass transfer effect, and packing ring adopts prior art, can be a kind of during Raschig ring, cascade ring, rectangular saddle ring, Pall ring, Haier encircle.Wherein, the advantage such as plastics Haier ring filler is a kind of novel perforated filling material of injection moulding, and it not only has, and flux is large, and pressure drop is low, and corrosion-resistant and anti-collision performance is good, also having can be not nested between filler, the advantages such as the little and uniform gas-liquid distribution of wall stream effect.Be applicable to the processes such as gas absorption and desorption, cooling and gas sweetening.

Please refer to Fig. 7, decarbonizing liquid regenerator column 9 is the steel packing tower, whole tower is comprised of main body 905, rich solution import 901, lean solution outlet 902, air intlet 903, discharge outlet 904, mouth spray 909, double-edged fine-toothed comb 907 etc., packing ring 908 is housed in the decarbonizing liquid regenerator column 9, main body 905 is provided with 2 of manholes (or a plurality of), play a part into tower maintenance, loading and unloading filler, main body 905 outsides are provided with external thermal insulation 911.Packing ring 908 is the filler of filling in the packing tower, works and increase gas-to-liquid contact, improves the effects such as mass transfer effect.

Claims

1. the system of a producing power fuel for agricultural machinery by adopting biogas methanation way, by feeding device, fermentor tank, gas-holder, desulfurizer, gas compressor, dewatering unit, decarbonizing tower, the decarbonizing liquid regenerator column, the dewatering agent regenerating unit, hot water boiler, interchanger forms, it is characterized in that: the discharge port of feeding device is connected with the opening for feed on fermentor tank top through a feed liquid pipeline, the air outlet at fermentor tank top is connected through the inlet mouth of biogas pipeline with the gas-holder middle part, the liquid outlet of fermentor tank bottom is communicated with the fluid inlet of feeding device through natural pond liquid reflux line, the air outlet at gas-holder top is connected with the desulfurization uphill line, desulfurizer is by No. one, No. two digester composes in parallel, No. one, the top of No. two digesters is respectively arranged with No. one, two desulfurization inlet mouths, No. one, the bottom of No. two digesters is respectively arranged with No. one, two desulfurization air outlets, No. one, two desulfurization inlet mouths are respectively through No. one, No. two the desulfurization intake ducting is connected with the desulfurization uphill line, No. one, two desulfurization air outlets are respectively through No. one, No. two the desulfurization outlet pipe is connected with the descending pipeline of desulfurization, No. one the desulfurization air outlet is communicated with No. two desulfurization inlet mouths through a by-pass line, No. two the desulfurization air outlet is communicated with a desulfurization inlet mouth through No. two by-pass lines, the descending pipeline of desulfurization is connected with the inlet mouth of gas compressor, the descending pipeline of desulfurization also is connected with the fuel gas inlet of hot water boiler through No. three by-pass lines, the air outlet of gas compressor is connected with the descending pipeline of decarburization through the biogas bearing pipe, the descending pipeline of decarburization is connected with the inlet mouth of decarbonizing tower, the air outlet of decarbonizing tower is connected with the decarburization uphill line, the decarburization uphill line is connected with the dehydration uphill line, dewatering unit is by No. one, No. two water knockout composes in parallel, No. one, the top of No. two water knockouts is respectively arranged with No. one, No. two dehydration inlet mouths, No. one, the bottom of No. two water knockouts is respectively arranged with No. one, No. two dehydration air outlets, No. one, No. two dehydration inlet mouths are respectively through No. one, No. two the dehydration intake ducting is connected with the dehydration uphill line, No. one, No. two dehydration air outlets are respectively through No. one, No. two the dehydration outlet pipe is connected with the descending pipeline of dehydration, the dewatering agent regenerating unit is by air-cooler, steam separator, recirculation blower and electric heater form, the air outlet of air-cooler is communicated with the inlet mouth of steam separator, the air outlet of steam separator is connected with circulating line, circulating line is connected with the resurgent gases uphill line, recirculation blower is arranged on the circulating line, electric heater is arranged on the resurgent gases uphill line, No. one, No. two dehydration inlet mouths are respectively through No. four, No. five by-pass line is connected with the descending pipeline of resurgent gases, No. one, No. two dehydration air outlets are respectively through No. six, No. seven by-pass line is connected with the resurgent gases uphill line, the descending pipeline one tunnel of resurgent gases is communicated with the inlet mouth of air-cooler, another road is communicated with exhaust pipe, one the tunnel is communicated with reflux line again, exhaust pipe is communicated with the fuel gas inlet of hot water boiler, reflux line is communicated with the inlet mouth of gas compressor, the hot water outlet of hot water boiler is communicated with the tube side entrance of interchanger through hot water pipeline, the tube side outlet of interchanger is communicated with the water return outlet of hot water boiler through water return pipeline, the shell side outlet of interchanger is communicated with the opening for feed of fermentor tank through No. two feed liquid pipelines, the shell side entrance of interchanger is communicated with the discharge port of feeding device through No. three feed liquid pipelines, the lean solution import of decarbonizing tower is communicated with the lean solution outlet of decarbonizing liquid regenerator column through the lean solution pipeline, be provided with lean pump on the lean solution pipeline, the rich solution import of decarbonizing liquid regenerator column is communicated with the rich solution outlet of decarbonizing tower through the rich solution pipeline.