CN105198182A - Method and device for gas production and electricity generation through sludge - Google Patents
Method and device for gas production and electricity generation through sludge Download PDFInfo
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- CN105198182A CN105198182A CN201510665425.9A CN201510665425A CN105198182A CN 105198182 A CN105198182 A CN 105198182A CN 201510665425 A CN201510665425 A CN 201510665425A CN 105198182 A CN105198182 A CN 105198182A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
A method for gas production and electricity generation through sludge comprises the following steps: further removing moisture in drying sludge by utilizing tail gas waste heat of a gas generator unit, grinding and crushing the dried sludge; conducting extrusion moulding on the crushed dried sludge by utilizing a forming machine to obtain square particles with the side length of 5-50 mm, cylindrical particles with the diameter of 5-50 mm and the height of 5-50 mm, or spherical particles with the equivalent diameter of 5-100 mm; detecting chemical components and physical properties of the formed sludge; conveying qualified formed sludge into a gas producer to react with a gasifying agent so as to generate gas; conveying gas subjected to cooling and dust removing into the gas generator for electricity generation. According to the method, the final target of harmless, stabilized, reduced and resourceful treatment of sludge in an urban sewage treatment plant can be realized, and better economic benefits, social benefits and environmental benefits can be achieved; the method can be widely applied to treatment of various types of urban sludge and garbage.
Description
Technical field
The present invention relates to a kind of mud gas electricity-generating method and device.
Background technology
In order to the water resources protecting us limited, create excellent living environment, sanitary sewage and trade effluent have to pass through the process of sewage work, could discharge after reaching state sewage emission standard, whether have urban sewage treatment system, this has become the mark of a modern city civilization, is also the requisite environmental engineering measure of Urban Ecology Environment Construction; Urban sewage treatment system comprises sewage disposal and sludge treatment two portions, in recent years, by Importing Foreign Advanced Technology and technological transformation, the water technology level of China is greatly improved, various types of sewage can be effectively controlled, but, can use for reference owing to there is no a kind of effective sludge disposal technology in the world, China, to the sludge disposal technology produced in sewage treatment process, lags behind the development of urban sewage treatment technology out and away; Pollutent most in sewage, in the process making sewage be purified, is transferred in mud by various water technology, and it is large that this mud that municipal sewage plant is produced has quantity, and the feature of the hazardous contaminant of enrichment high density.
At present, China mainly takes the method for disposal of interim heap buried to sludge from wastewater treatment plant, not only spend a large amount of funds and take a large amount of land resources, and cause serious secondary pollution to ecotope, ooze under sewage particularly in mud, the harm brought to groundwater resource is unable to estimate especially, and in fact peri-urban can not have the space and place that are applicable to stacking this kind of mud, the harm of the secondary environmental pollution that the interim heap buried of mud produces, in fact counteracts the environmental benefit of sewage disposal; The environmental problem caused in the face of mud increasingly sharp-pointed and mud endanger the reality of increasingly sharpening, and people attempt utilizing mud as fertilizer, and for agricultural or afforest, but each heavy metal species contained by mud limits the adaptability that soil utilizes mud; Research shows, the heavy metal of 1mg/L is removed from waste water, the heavy metal of 10000mg/L will be accumulated in mud, their meeting enrichments in soil, and enter food chain by the absorption of crop, finally jeopardize the health of human body, even if some mud is from city domestic sewage, although heavy metal content is lower, pathogenic agent contained in mud and persistence organic pollutant, and the various medicaments added in sewage treatment process, all can bring potential harm to environment.
With reference to the practice of external sludge incineration, some places are attempted by burning the object reaching mud decrement, but sludge incinerator investment cost is high, energy-output ratio is large, and working cost is expensive, the expense of sludge incineration is more than 400 yuan/ton, adding that mud is when burning, the residue after polluting and burning can be brought still to need the reasons such as disposal, according to the national conditions of China to atmospheric environment, sludge incineration process is difficult to bear economically, goes back imperfection technically.
The chemical constitution of municipal sludge is kept stable, and wherein the content of nitrogen and phosphorus is higher, containing higher organic substance in mud; In mud, organic content is high, and its calorific value is also high, and show by measuring, the organic substance of sludge from wastewater treatment plant accounts for 70% ~ 80%, and its calorific value is about the calorific value that 14MJ/kg is equivalent to brown coal; If the heat energy in mud can be developed, municipal sludge treatment plant can not only be made to obtain thoroughly processing safely, and the heat energy that mud can be made to have become valuable resource.
The method of some sludge power generations is also provided in the state of the art, as disclosed a kind of sludge from wastewater treatment plant disposal and utilization method in application for a patent for invention 201010107585.9, the steps include:, by the sludge press filtration of pressure filter by municipal sewage plant, to enter sludge drier by feeding machine; Calcium-based modifying agents is entered sludge drier by feeding machine, and calcium-based modifying agents consumption is up to 1/100 of mud weight, puddle with mud in sludge drier and drying sludge is become moisture be 15% ~ 20% loose shape mud; Tablets press is utilized loose mud to be pressed into the mud granule fuel of 5mm ~ 10mm particle diameter; This invention carries out minimizing, harmless treatment to mud preferably, and achieves recycling, does not only consume extra power simultaneously, and can produce the new energy or material supplies outward during process; Sewage treatment plants dewatered sludge calorific value, more than 2500 kilocalories, adopts the circular fluid bed of lower heat of combustion fuel, burns to the dewatered sludge after granulation, while generation is hot or electric, processes mud.
Separately have the existing scheme that other fuel (as coal or domestic refuse) that to adulterate in mud generates electricity, but these methods are directly to the direct combustion power generation of mud after dry and/or granulation mostly, capacity usage ratio of its generating is lower; Have scheme biogas prepared by sludge fermentation and be used for generating electricity, but the carbon dioxide produced in such scheme is more, thus its capacity usage ratio is not high yet yet.
Summary of the invention
For above-mentioned situation, the object of the invention is to provide a kind of mud gas electricity-generating method, the using waste heat from tail gas that it utilizes jet dynamic control to discharge is to sludge drying process, again by dried sludge crushing, extrusion molding, enter producer gas generator and vaporized chemical to react and produce coal gas, gas electricity generator generating is conveyed into by the coal gas after recovery of heat, washing, storage, purification, thus the mud of municipal sewage plant is realized to the ultimate aim of innoxious, stabilization, minimizing and recycling treatment, and good economic benefit can be obtained.
For realizing above-mentioned task, a kind of mud gas electricity-generating method, it comprises the following steps:
A. dry: the moisture removed in mud obtains the sludge-drying of water ratio 10 ~ 35%, Lower heat value >=8500KJ/Kg (if no special instructions, percentage composition of the present invention is weight percentage);
B. broken: dried mud to be carried out roll, broken processing;
C. shaping: the sludge-drying after fragmentation is utilized forming machine extrusion molding, obtaining the square particle length of side is 5mm ~ 50mm, or cylindrical particle diameter be 5mm ~ 50mm and high be 5mm ~ 50mm, or spheroidal particle equivalent diameter is 5mm ~ 100mm;
D. detect: chemical composition and physical property are carried out to shaping mud and detects, the parameter of described detection comprise in ash content, volatile matter, fixed carbon, sulphur, water ratio, lime-ash softening temperature, lime-ash performance, superior calorific value, Lower heat value and calorific value one or more;
E. gas processed: the qualified shaping mud of detection is transported to producer gas generator top, enters fuel bed through hopper from top to bottom; And vaporized chemical oxygen-rich air and superheated vapour according to ratio set by Ju shaping mud add-on through grate from bottom to top even fuel bed by producer gas generator time can meet with shaping mud, now shaping mud and vaporized chemical react generation coal gas;
F. lower the temperature: to coal gas cooling and purification, described purification comprises dedusting;
G. generate electricity: by the coal gas input gas-engine cylinder after cooling and purification, coal gas and air, compression, igniting blast and exhaust four stroke is sucked through cylinder, blast generate energy can promote piston linear motion, piston linear reciprocating motion is converted to rotary motion by bent axle, drive the generator connected with gas-engine to rotate, cutting magnetic line obtains electric energy.
For realizing effect optimization of the present invention, its further step: described step f also comprises the partial CO 2 removed in coal gas and the hydrogen sulfide removed in coal gas, makes the hydrogen sulfide content in coal gas be less than 20mg/m
3, meet the requirement of jet dynamic control to gas quality.
Vent gas treatment flow process after described gas-fired generating is as follows:
H. heat exchange: in the high-temperature tail gas steps for importing a of combustibleconstituents content≤1% emitted by jet dynamic control, temperature≤600 DEG C, drying is carried out to mud, mud fully contacts with high-temperature tail gas in drying installation, there is heat exchange, mud obtains further mummification, and exhaust temperature is reduced to less than 150 DEG C simultaneously;
I. wash: adopt clear water fully to contact in washer with tail gas, the trace solid in washing tail gas, exhaust temperature is reduced to less than 50 DEG C further;
J. desulfurization: doctor solution fully contacts in thionizer with tail gas, SO in tail gas
2generate stable compound with doctor solution reaction, desulfurization regeneration Posterior circle uses; Desulfurization adopts sodalime double alkali method, and doctor solution can also partial removal NO
x, dust concentration can be reduced further simultaneously.
In described step e, the temperature of fuel layer of producer gas generator is 600 ~ 1200 DEG C; The pressure of vaporized chemical oxygen-rich air and superheated vapour is 1000 ~ 20000Pa, and flow velocity is 0.5 ~ 2.0m/s; The height of fuel bed is 1.0 ~ 5.8m.
In described step e superheated vapour be adopt hardness≤100mg/L soft water made by, Ca in this soft water
2+and Mg
2+equivalent sum≤the 100mg/L of ion.
Gas-engine Import Gas temperature≤40 DEG C in described step g, combustibleconstituents content>=50%, the rate of change of combustibleconstituents content≤2%/min, H
2s≤20mg/Nm
3, impurity granularity≤5 μm, foreign matter content≤30mg/Nm
3, water-content≤40g/Nm
3.
After described gas-fired generating, the characteristic of final externally emission is: exhaust temperature≤50 DEG C, smoke content≤5mg/m
3, SO
2content≤10mg/Nm
3, NO
xcontent≤50mg/Nm
3; Odor concentration reaches GB14554-1993 primary standard value: ammonia content≤1.0mg/Nm
3, hydrogen sulfide content <0.03mg/Nm
3, trimethylamine content <0.05mg/Nm
3, methanthiol <0.004mg/Nm
3, dimethyl sulfide content <0.03mg/Nm
3, methyl disulfide content <0.03mg/Nm
3, dithiocarbonic anhydride content <2.0mg/Nm
3, styrene content <3.0mg/Nm
3, Dioxins is at 0.01ng/Nm
3below.
In described step c, the sludge-drying of fragmentation is utilized forming machine extrusion molding, obtaining the square particle length of side is 25mm ~ 40mm, or cylindrical particle diameter is 25mm ~ 40mm and high 25mm ~ 40mm, or spheroidal particle equivalent diameter is 55mm ~ 80mm.
Carry out chemical composition and physical property detection to shaping mud in described steps d, its chemical composition content meets ash content 20 ~ 40%, volatile matter 40 ~ 70%, fixed carbon 5 ~ 15%, sulphur 0.2 ~ 0.8% and water ratio 10 ~ 35%; Its physical property meets calorific value >=8.5MJ/Kg and lime-ash softening temperature 1200 ~ 1600 DEG C.
The present invention also provides a kind of mud gas electric generating apparatus, and it comprises drying installation, crusher, forming machine, producer gas generator, refining plant and gas electricity generator; Described drying installation, crusher and forming machine are connected for successively carrying out drying, fragmentation and shaping to mud successively; Described producer gas generator is connected to forming machine downstream for generation of coal gas, and its furnace roof or upper of furnace body are provided with the feeding mouth for molding mud, and furnace bottom or lower portion of furnace body are provided with the inlet mouth for inputting oxygen-rich air and water vapor; Described refining plant and gas electricity generator are connected to producer gas generator downstream and are respectively used to purify in producer gas generator the coal gas that produces and the coal gas after utilizing purification for raw material and generate electricity.
The invention provides a kind of mud gas electricity-generating method, it comprises the following steps: utilize jet dynamic control using waste heat from tail gas to remove moisture further to dewatered sludge, obtain the sludge-drying of water ratio 10 ~ 35%, its organic content is greater than 50%, Lower heat value 8500KJ/Kg and more than; Dried mud is broken through crusher grinding; The sludge-drying of fragmentation is utilized forming machine extrusion molding, and obtaining square particle is length of side 5mm ~ 50mm, cylindrical particle diameter 5mm ~ 50mm, high 5mm ~ 50mm, and spheroidal particle is equivalent diameter 5mm ~ 100mm; Carry out chemical composition and physical property detection to shaping mud, its chemical composition content meets ash content 20 ~ 40%, volatile matter 40 ~ 70%, fixed carbon 5 ~ 15%, sulphur 0.2 ~ 0.8% and water ratio 10 ~ 35%; Its physical property meets calorific value >=8.5MJ/Kg and lime-ash softening temperature 1200 ~ 1600 DEG C; Qualified shaping mud is transported to producer gas generator top, enters fuel bed through hopper from top to bottom, and vaporized chemical oxygen-rich air and superheated vapour evenly to react generation coal gas by the fuel bed of producer gas generator and with shaping mud from bottom to top through grate; Coal gas, by vapor superheater generation heat exchange, make steam superheating actuator temperature rise to 200 ~ 250 DEG C, and gas temperature drops to 250 ~ 300 DEG C; Coal gas is again through scrubber tower washing cooling dedusting, tar removing, and temperature drops to 20 ~ 50 DEG C further, then enters gas holder storage; Coal gas delivers into gas electricity generator burning and produces heat energy, drives the technical scheme of electrical power generators; The using waste heat from tail gas that it utilizes jet dynamic control to discharge is to sludge drying process, again by dried sludge crushing, extruding, shaping, enter producer gas generator and vaporized chemical to react and produce coal gas, coal gas is by generating electricity through gas electricity generator after recovery of heat, washing, storage, purification, thus the mud of municipal sewage plant is realized to the ultimate aim of innoxious, stabilization, minimizing and recycling treatment, and good economic benefit can be obtained.
The beneficial effect that the present invention is produced compared to existing technology:
I, the present invention adopts the thermal energy of gas-fired to be electric energy, and lowers the temperature to the tail gas after burning, wash and desulfurization removing nitric process, ensures qualified discharge, meets the policy requirements of developing a circular economy;
II, the present invention adopts jet dynamic control using waste heat from tail gas dewatered sludge, reduce the water ratio of mud, condition is created for realizing the generating of mud gas, open the effective way of a cyclic utilization of waste, significant social benefit and environmental benefit can be produced, obvious economic benefit can be obtained again;
III, the present invention adopts and carries out carbon dioxide removal and hydrogen sulfide to before gas to generate electricity, adds unit volume caloric power of gas, improves fuel gas temperature, thus improve the efficiency of gas electricity generator, meet the requirement of gas electricity generator to coal gas;
IV, the present invention adopts the square particle length of side to be 25mm ~ 40mm, or cylindrical particle diameter be 25mm ~ 40mm and high be 25mm ~ 40mm, or spheroidal particle equivalent diameter is the shaping mud of 55mm ~ 80mm, the shaping mud of per kilogram can be made to produce the output increased 30% of coal gas;
V, the present invention adopts Ca in the soft water producing superheated vapour
2+and Mg
2+equivalent sum≤the 100mg/L of ion, effectively can prevent producer gas generator from producing bird nest, improve the work-ing life of equipment and the production efficiency of coal gas;
VI, the present invention utilize jet dynamic control to discharge using waste heat from tail gas to sludge drying process, again by dried sludge crushing, extruding, shaping, enter producer gas generator and vaporized chemical to react and produce coal gas, coal gas is by generating electricity through gas electricity generator after recovery of heat, washing, storage, purification, thus the mud of municipal sewage plant is realized to the ultimate aim of innoxious, stabilization, minimizing and recycling treatment, and good social benefit, environmental benefit and economic benefit can be obtained.
The present invention is widely used in the process of various municipal sludge and rubbish.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
The accompanying drawing forming the application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
Fig. 1 is workflow diagram of the present invention.
Fig. 2 is the structural representation of mud gas electric generating apparatus of the present invention.
Fig. 3 is the syndeton schematic diagram of exhaust scrubber and thionizer in the present invention.
In figure: 1-drying installation, 2-crusher, 3-forming machine, 4-producer gas generator, 5-heat sink, 6-refining plant, 7-gas electricity generator, 8-exhaust scrubber, 9-thionizer.
Embodiment
As shown in Figure 1, workflow of the present invention comprises the following steps:
1) dry: to utilize gas electricity generator using waste heat from tail gas to remove moisture further to dewatered sludge in drying installation 1, obtain the sludge-drying of water ratio 10 ~ 35%, wherein organic matter comprises protein, humic acids and carbohydrate equal size and is greater than 50%, Lower heat value >=8500KJ/Kg, its Lower heat value method of masurement operative norm GB/T12206;
2) broken: dried mud to be carried out rolling through crusher 2, broken processing;
3) shaping: the sludge-drying of fragmentation to be utilized forming machine 3 extrusion molding, obtaining the square particle length of side is 5mm ~ 50mm, or cylindrical particle diameter be 5mm ~ 50mm and high be 5mm ~ 50mm, or spheroidal particle equivalent diameter is 5mm ~ 100mm; Described shaping mud preferred size is square particle length of side 25mm ~ 40mm, or cylindrical particle diameter is 25mm ~ 40mm and high 25mm ~ 40mm, or spheroidal particle equivalent diameter is 55mm ~ 80mm, every kilogram of shaping mud can be made to produce the output increased 30% of coal gas;
4) detect: chemical composition and physical property are carried out to shaping mud and detects, the parameter of described detection comprise in ash content, volatile matter, fixed carbon, sulphur, water ratio, calorific value and lime-ash softening temperature one or more; Preferably its chemical composition content meets ash content 20 ~ 40%, volatile matter 40 ~ 70%, fixed carbon 5 ~ 15%, sulphur 0.2 ~ 0.8% and water ratio 10 ~ 35%; Its physical property meets calorific value >=8.5MJ/Kg and lime-ash softening temperature 1200 ~ 1600 DEG C; Described lime-ash is silicate by the elementary composition compound such as silicon, aluminium, iron, calcium and oxygen, its principal mode, silico-aluminate, silicon, aluminium, iron, calcium oxide, vitriol etc.; Silicate, silico-aluminate, vitriol etc. have higher softening temperature, and the inner top temperature of shaping mud will lower than softening temperature, otherwise lime-ash difficulty is broken, and lime-ash wraps up shaping mud and causes utilization ratio low, and affect vaporized chemical passage, reduce gas making efficiency;
5) gas processed: the qualified shaping mud of detection is transported to producer gas generator 4 top, enters fuel bed through hopper from top to bottom; And vaporized chemical oxygen-rich air and superheated vapour are through the grate even fuel bed by producer gas generator 4 meeting with shaping mud from bottom to top, now shaping mud and vaporized chemical react generation coal gas; In the gas-making process of described coal gas, the temperature of fuel layer of producer gas generator 4 is 600 ~ 1200 DEG C; The pressure of vaporized chemical oxygen-rich air and superheated vapour is 1000 ~ 20000Pa, and flow velocity is 0.5 ~ 2.0m/s; Fuel layer height is 1.0 ~ 5.8m; Softened water hardness≤the 100mg/L of described production superheated vapour, i.e. Ca in soft water
2+and Mg
2+equivalent sum≤the 100mg/L of ion, effectively can prevent producer gas generator 4 from producing bird nest, improve the work-ing life of equipment and the production efficiency of coal gas;
6) lower the temperature: coal gas, through vapor superheater generation heat exchange, make steam superheating actuator temperature rise to 200 ~ 250 DEG C, and water-gas temperature drops to 250 ~ 300 DEG C; Coal gas comprises scrubber tower washing cooling dedusting, tar removing and the removal of impurity through heat sink 5 again, and temperature drops to 20 ~ 50 DEG C further, and the coal gas arrangement after described cooling enters gas holder storage;
7) purify: the coal gas in storage gas holder is delivered in the process of gas electricity generator the partial CO 2 removed through refining plant 6 in coal gas; Wet desulfurizing process such as employing MSQ, tannin process etc. removes the hydrogen sulfide in coal gas, makes the hydrogen sulfide content in coal gas be less than 20mg/m
3, add unit volume caloric power of gas, improve fuel gas temperature, thus improve the efficiency of gas electricity generator 7, meet the requirement of gas electricity generator 7 pairs of coal gas;
8) generate electricity: the coal gas after purification is delivered into gas electricity generator 7 and to burn generation heat energy, drive gas electricity generator 7 to generate electricity; Gas electricity generator 7 is mechanical energy by the thermal energy of gas-fired, then be the equipment of electric energy by mechanical energy; It is made up of air feed, lubrication, cooling, igniting, startup and speed governing six Iarge-scale system; Institute's Import Gas temperature≤40 DEG C in described generating set incinerator, combustibleconstituents content>=50%, the rate of change of combustibleconstituents content≤2%/min, H
2s≤20mg/Nm
3, impurity granularity≤5 μm, foreign matter content≤30mg/Nm
3, water-content≤40g/Nm
3; Described combustibleconstituents comprises hydrogen, carbon monoxide, methane (nitrogen, indifferent gas, carbonic acid gas are non-combustible components), described impurity mainly refers to incombustible ash content, the content of combustibleconstituents is high, and calorific value is just high, and the efficiency of gas electricity generator 7 is just high; Impurity is few, little to the wearing and tearing of gas electricity generator 7 cylinder, can extend the work-ing life of gas electricity generator 7, reduces maintenance cost;
9) heat exchange: the high-temperature tail gas (combustibleconstituents content≤1%, temperature≤600 DEG C) ejected by jet dynamic control is by sludge drying mechanism 1, mud fully contacts with tail gas in drying installation 1, there is heat exchange, mud obtains mummification further, and exhaust temperature is also reduced to less than 150 DEG C simultaneously;
10) wash: adopt clear water fully to contact in exhaust scrubber 8 with tail gas, the trace solid in washing tail gas, exhaust temperature is reduced to less than 50 DEG C further;
11) desulfurization: doctor solution fully contacts in thionizer 9 with tail gas, SO in tail gas
2generate stable compound with doctor solution reaction, desulfurization regeneration Posterior circle uses; Desulfurization adopts sodalime double alkali method, and doctor solution can also partial removal NO
x, dust concentration can be reduced further simultaneously.
12) discharge: the characteristic of final externally emission is exhaust temperature≤50 DEG C, smoke content≤5mg/m
3, SO
2content≤10mg/Nm
3, NO
xcontent≤50mg/Nm
3; Odor concentration reaches GB14554-1993 primary standard value: ammonia content≤1.0mg/Nm
3, hydrogen sulfide content <0.03mg/Nm
3, trimethylamine content <0.05mg/Nm
3, methanthiol <0.004mg/Nm
3, dimethyl sulfide content <0.03mg/Nm
3, methyl disulfide content <0.03mg/Nm
3, dithiocarbonic anhydride content <2.0mg/Nm
3, styrene content <3.0mg/Nm
3, Dioxins is at 0.01ng/Nm
3below.
As shown in Figure 2, mud gas electric generating apparatus of the present invention comprises drying installation 1, crusher 2, forming machine 3, producer gas generator 4, refining plant 6 and gas electricity generator 7; Described drying installation 1, crusher 2 and forming machine 3 are connected successively and are used for successively carrying out drying, fragmentation and shaping to mud; Described producer gas generator 4 is connected to forming machine 3 downstream for generation of coal gas, and its furnace roof or upper of furnace body are provided with the feeding mouth for molding mud, and furnace bottom or lower portion of furnace body are provided with the inlet mouth for inputting oxygen-rich air and water vapor; Described refining plant 6 and gas electricity generator 7 are connected to producer gas generator 4 downstream and are respectively used to purify the coal gas that produces in producer gas generator 4 and utilize purification coal gas to generate electricity for raw material; The heat sink 5 for lowering the temperature to coal gas is provided with between producer gas generator 4 and refining plant 6.
As shown in Figure 3, mud gas electric generating apparatus of the present invention also comprises the pipeline being communicated with described gas electricity generator 7 and described drying installation 1, described pipeline is for transporting the high-temperature tail gas in gas electricity generator 7, and described high-temperature tail gas contacts with mud and carries out drying to mud; Described exhaust scrubber 8 and thionizer 9 are connected to the downstream in the exhaust pipe road from gas electricity generator 7 to drying installation 1 in turn, clear water and tail gas complete the washing process to tail gas in exhaust scrubber 8, tail gas after washing and doctor solution complete FGD-Flue gas desulphurization process in described thionizer 9, and described thionizer 9 is provided with exhaust port.
Specific embodiments of the invention see the following form, and affect large by the size of known shaping mud in table on the production efficiency of coal gas.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations; Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a mud gas electricity-generating method, is characterized in that comprising the following steps:
A. dry: the moisture removed in mud obtains the sludge-drying of water ratio 10 ~ 35%, Lower heat value >=8500KJ/Kg;
B. broken: dried mud to be carried out roll, broken processing;
C. shaping: the sludge-drying after fragmentation is utilized forming machine extrusion molding, obtaining the square particle length of side is 5mm ~ 50mm, or cylindrical particle diameter be 5mm ~ 50mm and high be 5mm ~ 50mm, or spheroidal particle equivalent diameter is 5mm ~ 100mm;
D. detect: chemical composition and physical property are carried out to shaping mud and detects, the parameter of described detection comprise in ash content, volatile matter, fixed carbon, sulphur, water ratio, lime-ash softening temperature, lime-ash performance, superior calorific value, Lower heat value and calorific value one or more;
E. gas processed: the qualified shaping mud of detection is transported to producer gas generator top, enters fuel bed through hopper from top to bottom; And vaporized chemical oxygen-rich air and superheated vapour according to ratio set by Ju shaping mud add-on through grate from bottom to top even fuel bed by producer gas generator time can meet with shaping mud, now shaping mud and vaporized chemical react generation coal gas;
F. lower the temperature: to coal gas cooling and purification, described purification comprises dedusting;
G. generate electricity: by the coal gas input gas-engine cylinder after cooling and purification, coal gas and air, compression, igniting blast and exhaust four stroke is sucked through cylinder, blast generate energy can promote piston linear motion, piston linear reciprocating motion is converted to rotary motion by bent axle, drive the generator connected with gas-engine to rotate, cutting magnetic line obtains electric energy.
2. a kind of mud gas electricity-generating method according to claim 1, is characterized in that described step f also comprises the partial CO 2 removed in coal gas and the hydrogen sulfide removed in coal gas, makes the hydrogen sulfide content in coal gas be less than 20mg/m
3, meet the requirement of gas electricity generator to gas quality.
3. a kind of mud gas electricity-generating method according to claim 1, is characterized in that the vent gas treatment flow process after described gas-fired generating is as follows:
H. heat exchange: in the high-temperature tail gas steps for importing a of combustibleconstituents content≤1% emitted by jet dynamic control, temperature≤600 DEG C, drying is carried out to mud, mud fully contacts with high-temperature tail gas in drying installation, there is heat exchange, mud obtains further mummification, and exhaust temperature is reduced to less than 150 DEG C simultaneously;
I. wash: adopt clear water fully to contact in washer with tail gas, the trace solid in washing tail gas, exhaust temperature is reduced to less than 50 DEG C further;
J. desulfurization: doctor solution fully contacts in thionizer with tail gas, SO in tail gas
2generate stable compound with doctor solution reaction, desulfurization regeneration Posterior circle uses; Desulfurization adopts sodalime double alkali method, and doctor solution can also partial removal NO
x, dust concentration can be reduced further simultaneously.
4. a kind of mud gas electricity-generating method according to claim 1, is characterized in that the temperature of fuel layer of producer gas generator in described step e is 600 ~ 1200 DEG C; Pressure 1000 ~ the 20000Pa of vaporized chemical oxygen-rich air and superheated vapour, flow velocity is 0.5 ~ 2.0m/s; The height of fuel bed is 1.0 ~ 5.8m.
5. a kind of mud gas electricity-generating method according to claim 1, it is characterized in that superheated vapour in described step e be adopt hardness≤100mg/L soft water made by, Ca in this soft water
2+and Mg
2+equivalent sum≤the 100mg/L of ion.
6. a kind of mud gas electricity-generating method according to claim 1, is characterized in that gas-engine Import Gas temperature≤40 DEG C in described step g, combustibleconstituents content>=50%, the rate of change of combustibleconstituents content≤2%/min, H
2s≤20mg/Nm
3, impurity granularity≤5 μm, foreign matter content≤30mg/Nm
3, water-content≤40g/Nm
3.
7. a kind of mud gas electricity-generating method according to claim 3, after it is characterized in that described gas-fired generating, the characteristic of final externally emission is: exhaust temperature≤50 DEG C, smoke content≤5mg/m
3, SO
2content≤10mg/Nm
3, NO
xcontent≤50mg/Nm
3; Odor concentration reaches GB14554-1993 primary standard value: ammonia content≤1.0mg/Nm
3, hydrogen sulfide content <0.03mg/Nm
3, trimethylamine content <0.05mg/Nm
3, methanthiol <0.004mg/Nm
3, dimethyl sulfide content <0.03mg/Nm
3, methyl disulfide content <0.03mg/Nm
3, dithiocarbonic anhydride content <2.0mg/Nm
3, styrene content <3.0mg/Nm
3, Dioxins is at 0.01ng/Nm
3below.
8. a kind of mud gas electricity-generating method according to claim 1, it is characterized in that, in described step c, the sludge-drying of fragmentation is utilized forming machine extrusion molding, obtaining the square particle length of side is 25mm ~ 40mm, or cylindrical particle diameter is 25mm ~ 40mm and high 25mm ~ 40mm, or spheroidal particle equivalent diameter is 55mm ~ 80mm.
9. according to a kind of mud gas electricity-generating method in claim 1 ~ 8 described in any one, it is characterized in that carrying out chemical composition and physical property detection to shaping mud in described steps d, its chemical composition content meets ash content 20 ~ 40%, volatile matter 40 ~ 70%, fixed carbon 5 ~ 15%, sulphur 0.2 ~ 0.8% and water ratio 10 ~ 35%; Its physical property meets calorific value >=8.5MJ/Kg and lime-ash softening temperature 1200 ~ 1600 DEG C.
10. realize a kind of mud gas electric generating apparatus of mud gas electricity-generating method described in claim 1, it is characterized in that comprising drying installation (1), crusher (2), forming machine (3), producer gas generator (4), refining plant (6) and gas electricity generator (7); Described drying installation (1), crusher (2) and forming machine (3) are connected successively and are used for successively carrying out drying, fragmentation and shaping to mud; Described producer gas generator (4) is connected to forming machine (3) downstream for generation of coal gas, its furnace roof or upper of furnace body are provided with the feeding mouth for molding mud, and furnace bottom or lower portion of furnace body are provided with the inlet mouth for inputting oxygen-rich air and water vapor; Described refining plant (6) and gas electricity generator (7) are connected to producer gas generator (4) downstream and are respectively used to purify the coal gas that produces in producer gas generator (4) and the coal gas after utilizing purification for raw material and generate electricity.
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| CN111569648A (en) * | 2020-05-18 | 2020-08-25 | 新沂百川畅银新能源有限公司 | Power generation device and power generation working method for landfill gas |
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