CN103074113A - Method for preparing gas by using biomass and coal - Google Patents
Method for preparing gas by using biomass and coal Download PDFInfo
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- CN103074113A CN103074113A CN2013100599691A CN201310059969A CN103074113A CN 103074113 A CN103074113 A CN 103074113A CN 2013100599691 A CN2013100599691 A CN 2013100599691A CN 201310059969 A CN201310059969 A CN 201310059969A CN 103074113 A CN103074113 A CN 103074113A
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- 239000002028 Biomass Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000003245 coal Substances 0.000 title claims abstract description 19
- 238000002309 gasification Methods 0.000 claims abstract description 61
- 238000001035 drying Methods 0.000 claims abstract description 25
- 239000002918 waste heat Substances 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000000567 combustion gas Substances 0.000 claims description 80
- 229910052799 carbon Inorganic materials 0.000 claims description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 29
- 238000000227 grinding Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000009434 installation Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 35
- 239000002699 waste material Substances 0.000 abstract description 14
- 238000000746 purification Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000013067 intermediate product Substances 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 239000011269 tar Substances 0.000 description 68
- 239000000428 dust Substances 0.000 description 13
- 239000003921 oil Substances 0.000 description 9
- 239000010902 straw Substances 0.000 description 9
- 241000209094 Oryza Species 0.000 description 8
- 235000007164 Oryza sativa Nutrition 0.000 description 8
- 239000010903 husk Substances 0.000 description 8
- 235000009566 rice Nutrition 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 210000003608 fece Anatomy 0.000 description 7
- 239000002023 wood Substances 0.000 description 7
- 239000011280 coal tar Substances 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 238000013467 fragmentation Methods 0.000 description 6
- 238000006062 fragmentation reaction Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 244000046052 Phaseolus vulgaris Species 0.000 description 5
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000003801 milling Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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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
- 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
Abstract
The invention discloses a method for preparing gas by using biomass and coal. By using the biomass as main raw materials, a certain amount of coal is added to prepare biomass gas. The method comprises the processes of preheating drying, primary medium-temperature gasification, secondary high-temperature gasification, gas purification and the like. The gas prepared by using the method is high in heat value and can be in accordance with a gas using standard. By the adoption of the method, new energy is obtained; wastes are recycled; intermediate products and waste heat are fully and reasonably utilized technologically; pollutant emission and energy consumption are reduced; and the method is in accordance with an idea of cleaner production.
Description
Technical field
The present invention relates to a kind of biomass waste and coal that utilizes agricultural to produce and jointly prepare the method for combustion gas, take full advantage of biomass and under the synergy of coal, produce combustion gas, belong to changing waste into resources, new energy field.
Background technology
Tellurian biomass net response is huge, is equivalent to 10 times of present world total energy consumption, great exploitation is arranged, utilize potentiality.
China's agroforestry are produced and are occupied critical role, produce a large amount of biomass wastes in agroforestry production and the agricultural byproducts processing process, comprise various stalks, rice husk, excrement of animals, bean dregs, wood chip etc., biomass waste is dealt with improperly and is usually caused environmental pollution, comprises atmosphere, water body, soil etc.More than 3,000 ten thousand tons of annual China rice husk output, collectable stalk amount is above 700,000,000 tons.The Lower heat value of rice husk, stalk is about 12000 ~ 17000 kJ/kg, and agricultural crop straw is potential, a huge energy depot." " 12 " utilization of resources instruction " it " large solid waste comprehensive utilization embodiment " proposes, and the target of straw utilization rate in 2015 is 80%, seek low cost, efficiently, straw utilization approach easily, be the straw utilization key point.The Lower heat value of excrement of animals is about 14000 kJ/kg, and the Lower heat value of bean dregs is about 15000 kJ/kg, and the Lower heat value of wood chip is then higher, substantially is higher than 18000 kJ/kg.China's biomass waste output is large, in addition its higher calorific value feature, and biomass waste has formed a potential huge energy sink.
China is an energy consumption big country, and prospective oil is less, and is large to the Imported oil dependency; Natural gas reserves is also limited; Domestic main energy substance is coal, and Coal Mine Coal Reserve is larger, but the colliery is Nonrenewable resources.From long term growth, have to consider the energy dilemma that at every moment exists.Biomass energy is renewable resources, and taking full advantage of biomass waste can reduce waste to the pollution of environment on the one hand, on the other hand can alleviating energy crisis.
At present, utilize the standby combustion gas of biomass-making much to be paid close attention to and study.Publication number is the system and method that CN 101774542 A disclose a kind of biomass gasifying hydrogen making, adopts biomass gasifying hydrogen making to combine with the chemical bond burning, take metal oxide as thermal barrier and system's realization of between three, circulate of oxygen carrier hang down CO
2Discharging hydrogen manufacturing.Publication number is that CN 101747945 A disclose the method that a kind of two-stage type biomass prepares synthetic gas, the method is with biomass cracking, obtain charcoal and bio-crude oil, utilize transferpump that bio-crude oil or charcoal are sent into gasifier system for synthetic gas with the oil carbon slurry that bio-crude oil is mixed with.In these method gas-making processes or need external system that water vapour is provided, or need catalyzer, or limited to the processing of the tar that produces in the cracking process.
Summary of the invention
The object of the invention is to provide the altogether method of combustion gas processed of a kind of biomass and coal, the method is take biomass as main raw material, add a certain amount of coal and prepare biological fuel gas, the preparation method mainly comprises preheating and drying, middle wet once, secondary high-temperature gasification and gas-purification supervisor, wherein utilize the waste heat preheating and drying biomass of combustion gas, the vaporized chemical of wet during the water vapour that the preheating and drying step produces is used as once, once the biological carbon of gasification generation is used for removing the tar of combustion gas, charcoal behind the tar removing carries out the secondary high-temperature gasification through pulverizing with the combustion gas of once gasification generation, and tar is removed in the combustion gas after the secondary high-temperature gasification, make required combustion gas after further purifying.
The present invention is achieved through the following technical solutions:
(1) biomass are carried out preliminary fragmentation, make its particle diameter less than 2 cm, utilize the subsequent handling waste heat to advance material is carried out preheating and drying, dried water ratio is lower than 5%.The moisture vapor transport that drying process produces wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, material particular diameter obtains powder biomass less than 1 mm behind the grinding;
(3) wet gasifying device during the powder biomass that obtains of step (2) and coal dust are sent into once, the water vapour that produces with step (1) once gasifies in the wet gasifying device in once, the intake of water vapour in once the relative humidity in the wet reaction unit as reference, once the relative humidity in the middle wet reaction unit is controlled in 7% ~ 10% scope, the quality of pc that wherein mixes is that 5% ~ 10%(of powder biomass quality is in butt), once the temperature of middle wet is 300 ~ 500 ℃, makes combustion gas, biological carbon and ash content;
(4) the secondary high-temperature gasification installation is led in the combustion gas that obtains behind the wet in once, and once the biological carbon that obtains of gasification is transported to the tar-removing device after the secondary high-temperature gasification gas device, as tar removing material enrichment tar, can change continuously;
(5) biological carbon behind the tar removing in the step (4) is carried out grinding, behind the grinding material particle diameter less than 0.5 mm, obtain the grinding shape and contain the tar biological carbon;
(6) combustion gas that wet obtains in will be once and grinding shape contain the tar biological carbon and are transported to the secondary high-temperature gasification installation and carry out the secondary high-temperature gasification (addition that contains the tar biological carbon is decided with the volume of the generation of biological carbon and reactor, is controlled at 0 ~ 0.15 t/m
3H), the temperature of secondary high-temperature gasification is controlled at 1100 ~ 1300 ℃, obtains combustion gas;
(7) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the impurity such as tar in the combustion gas, and this step is furnished with heat exchanger, reduces temperature promoting adsorption cleaning, and utilizes waste heat gas that the biomass of preliminary fragmentation are carried out preheating and drying;
(8) combustion gas behind the tar removing is transported to refining plant and further purifies, and removes the impurity such as dust in the combustion gas, obtains the combustion gas of high-quality finished product.
The steam that the preheating and drying process of step in the inventive method (1) raw material produces can be used as the vaporized chemical of step (3), both for gasification provides vaporized chemical, again energy-conservation, reduce waste discharge; Step (3) once in the biological carbon of wet generation as the sorbent material of tar in gas, and further gasification in step (6) secondary high-temperature gasification.
The principle of the invention is as follows: the chief component of biomass is C, H, O, N, and thermo-cracking, redox reaction can occur biomolecules under certain thermodynamic condition, generates micro-molecular gas, biological carbon and ash content.Biomass begin gasification under 300 ℃ of temperature condition, generate CO, CO
2, H
2, CH
4, the materials such as tar, biological carbon, tar begins cracking when temperature is higher than 800 ℃, overwhelming majority tar were cleaved when temperature was 1100 ℃ ~ 1300 ℃, main reaction formula has:
Biomass+O
2/ H
2O → CO+CO
2+ H
2+ CH
4+ CHX+larger molecular organics+tar+ash content+C (biological carbon)+other;
Larger molecular organics (hydrocarbon, aromatic compound) → CO+H
2O+H
2+ CO
2+ CH
4+ O
2
C?+?O
2?→?CO
2；C?+?O
2?→?CO；
C?+?H
2O?→?CO?+?H
2；C?+?H
2?→?CH
4；
C+CO
2→ CO; Tar+C+O
2→ CO+CH
4+ CO
2+ H
2O;
Biomass refer to produce a large amount of biomass wastes in agroforestry production and the agricultural byproducts processing process among the present invention, comprise various stalks, rice husk, excrement of animals, bean dregs, wood chip etc.
Advantage of the present invention:
The present invention utilizes biomass waste to prepare biological fuel gas, adds a small amount of coal and promotes and improve biomass through pyrolysis and efficient.The utilization of biomass preheating and drying process be the waste heat that produces in the technique, the water vapour that drying step produces is technique vaporized chemical is provided as the vaporized chemical of wet in once, has reduced again the discharging of refuse.In gasification minute two stages, once middle wet and secondary high-temperature gasification can reduce the consumption of gasification energy.Middle thermophase makes most of gasifying biomass, obtains part biological carbon, and the biological carbon that obtains can be used as the coal-tar middle oil removal material of combustion gas.The biological carbon of tar removing turns back to the secondary high-temperature gasification installation through grinding, with once in the wet combustion gas at high temperature carry out cracking, make the abundant cracking of tar become small molecules combustion gas material, reduced the coal-tar middle oil content of combustion gas, improved the calorific value of combustion gas.Combustion gas is used heat exchanger cooling after purifying, waste heat is used for initial biomass preheating and drying, takes full advantage of waste heat, save energy.
Whole technique has not only realized utilizing biomass waste to prepare combustion gas, and the calorific value of combustion gas is higher, can reach the standard that combustion gas is used.Both obtain new forms of energy, made changing waste into resources, and fully rationally utilized intermediate product, waste heat in the technique, reduced pollution substance discharging and energy consumption, met the theory of cleaner production.
Description of drawings
Fig. 1 is the altogether process flow diagram of combustion gas processed of biomass of the present invention and coal.
Embodiment
Below by drawings and Examples the present invention is described in further detail, but protection domain of the present invention is not limited to described content.
Embodiment 1: biomass and coal be the method for combustion gas processed altogether, and concrete operations are as follows:
(1) take stalk, cow dung as main biomass material, stalk is carried out fragmentation, make its particle diameter less than 2 cm, preheating and to be dried to water ratio be 3%, stalk and cow dung mass ratio are 1:1, the waste heat that obtains with subsequent handling is to stalk and cow dung preheating and drying (this step needs external source that heat is provided during initial start-up), the moisture vapor transport that drying process produces wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, material particular diameter obtains the powdery biomass less than 1mm behind the grinding;
(3) wet gasifying device during the powdery biomass that obtain of step (2) and coal dust are sent into once, the water vapour that produces with step (1) once gasifies in the wet gasifying device in once, wherein the addition of coal dust is 5% of powdery biomass butt quality, once the temperature of middle wet is in 300 ~ 450 ℃ of scopes, after passing into water vapour in the warm device once, relative humidity is about 8%, and obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain tar in the gas, in addition forming section biological carbon and ash content;
(4) the secondary high-temperature gasification installation is led in the combustion gas that obtains behind the wet in once, and once the biological carbon that obtains of gasification is transported in the tar-removing device after the secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon behind the tar removing in the step (4) is carried out grinding, behind the grinding material particle diameter less than 0.5 mm, obtain the grinding shape and contain the tar biological carbon;
(6) combustion gas that wet obtains in will be once and grinding shape contain the tar biological carbon and are transported to the secondary high-temperature gasification installation and carry out the secondary high-temperature gasification, and the addition that the grinding shape contains the tar biological carbon is 0.1 t/m
3H, the temperature of secondary high-temperature gasification is controlled in 1100 ~ 1250 ℃ of scopes, and obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain a small amount of tar in the gas, and produce a certain amount of ash content;
(7) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the tar in the combustion gas, and the heat exchange system of outfit makes the main body process temperature of tar rough purification be lower than 50 ℃, and waste heat gas carries out preheating and drying to stalk and cow dung; After the effect through biological carbon in the tar-removing device, the coal-tar middle oil amount of combustion gas reduces about 90%;
(8) combustion gas behind the tar removing is transported to refining plant and adopts ordinary method further to purify, remove the impurity such as dust in the combustion gas, further purifying gas makes the indexs such as dust, tar meet gasifying biomass combustible gas performance index, and dust and tar content are 6 ~ 8 mg/m
3The low heat value of finished product combustion gas is about 16 MJ/m
3
Embodiment 2: biomass and coal be the method for combustion gas processed altogether, and concrete operations are as follows:
(1) take stalk, bean dregs as main biomass material, stalk is carried out fragmentation, make its particle diameter less than 2 cm, preheating and to be dried to water ratio be 2%, stalk and cow dung mass ratio are 2:1, the waste heat that obtains with subsequent handling is to stalk and bean dregs preheating and drying (this step needs external source that heat is provided during initial start-up), the moisture vapor transport that drying process produces wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, material particular diameter obtains the powdery biomass less than 1mm behind the grinding.
(3) wet gasifying device during the powdery biomass that obtain of step (2) and coal dust are sent into once, the water vapour that produces with step (1) once gasifies in the wet gasifying device in once, the quality of pc that wherein mixes is 8% of powder biomass, once the temperature of middle wet remains in 350 ~ 400 ℃ of scopes, after passing into water vapour in the warm device once, relative humidity about 9%; Obtaining main component after the gasification is CO, CO2, H
2, CH
4Combustion gas, contain tar in the gas, in addition forming section biological carbon and ash content;
(4) the secondary high-temperature gasification installation is led in the combustion gas that obtains behind the wet in once, and once the biological carbon that obtains of gasification is transported in the tar-removing device after the secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon behind the tar removing in the step (4) is carried out grinding, behind the grinding material particle diameter less than 0.5 mm, obtain the grinding shape and contain the tar biological carbon;
(6) combustion gas that wet obtains in will be once and grinding shape contain the tar biological carbon and are transported to the secondary high-temperature gasification installation and carry out the secondary high-temperature gasification, and the addition that the grinding shape contains the tar biological carbon is 0.08 t/m
3H, the temperature of secondary high-temperature gasification is controlled in 1150 ~ 1300 ℃ of scopes, and obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain a small amount of tar in the gas, and produce a certain amount of ash content;
(7) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the tar in the combustion gas, and the heat exchange system of outfit makes the main body process temperature of tar rough purification be lower than 50 ℃.Waste heat gas carries out preheating and drying to stalk and cow dung; After the effect through biological carbon in the tar-removing device, the coal-tar middle oil amount of combustion gas reduces about 90%;
(8) combustion gas behind the tar removing is transported to refining plant and adopts ordinary method further to purify, remove the impurity such as dust in the combustion gas, further purifying gas makes the indexs such as dust, tar meet gasifying biomass combustible gas performance index, and dust and tar content are 5 ~ 8 mg/m
3The low heat value of finished product combustion gas is about 15.5 MJ/m
3
Embodiment 3: biomass and coal be the method for combustion gas processed altogether, and concrete operations are as follows:
(1) take wood chip, branches and leaves as main biomass material, wood chip, branches and leaves are carried out fragmentation, make its particle diameter less than 2 cm, preheating and to be dried to water ratio be 3%, wood chip, branches and leaves mass ratio are 1:2, the waste heat that obtains with subsequent handling is to wood chip, branches and leaves preheating and drying (this step needs external source that heat is provided during initial start-up), the moisture vapor transport that drying process produces wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, material particular diameter obtains powder biomass less than 1 mm behind the grinding;
(3) wet gasifying device during the powder biomass that obtains of step (2) and coal dust are sent into once, the water vapour that produces with step (1) once gasifies in the wet gasifying device in once; Wherein the addition of coal dust is 10% of powdery biomass butt quality, once in the temperature of wet remain in 350 ~ 500 ℃ of scopes, pass into water vapour in the warm device in once after, relative humidity is about 7%, obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain tar in the gas, in addition forming section biological carbon and ash content;
(4) the secondary high-temperature gasification installation is led in the combustion gas that obtains behind the wet in once, and once the biological carbon that obtains of gasification is transported in the tar-removing device after the secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon behind the tar removing in the step (4) is carried out grinding, behind the grinding material particle diameter less than 0.5 mm, obtain the grinding shape and contain the tar biological carbon,
(6) combustion gas that wet obtains in will be once and grinding shape contain the tar biological carbon and are transported to the secondary high-temperature gasification installation and carry out the secondary high-temperature gasification, and the addition that the grinding shape contains the tar biological carbon is 0.14 t/m
3H, the temperature of secondary high-temperature gasification is controlled in 1100 ~ 1200 ℃ of scopes, and obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain a small amount of tar in the gas, and produce a certain amount of ash content;
(7) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the tar in the combustion gas; The heat exchange system that is equipped with makes the main body process temperature of tar rough purification be lower than 50 ℃.Waste heat gas carries out preheating and drying to stalk and cow dung, and after the effect through biological carbon in the tar-removing device, the coal-tar middle oil amount of combustion gas reduces about 90%;
(8) combustion gas behind the tar removing is transported to refining plant and adopts ordinary method further to purify, remove the impurity such as dust in the combustion gas, further purifying gas makes the indexs such as dust, tar meet gasifying biomass combustible gas performance index, and dust and tar content are 6 ~ 8 mg/m
3, the low heat value of finished product combustion gas is about 17.5 MJ/m
3
Embodiment 4: biomass and coal be the method for combustion gas processed altogether, and concrete operations are as follows:
(1) take rice husk, tabacco straw as main biomass material, tabacco straw is carried out fragmentation, make its particle diameter less than 2 cm, preheating and to be dried to water ratio be 3%, rice husk, tabacco straw mass ratio are 3:2, the waste heat that obtains with subsequent handling is to rice husk, tabacco straw preheating and drying (this step needs external source that heat is provided during initial start-up), the moisture vapor transport that drying process produces wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, material particular diameter obtains powder biomass less than 1 mm behind the grinding;
(3) wet gasifying device during the powder biomass that obtains of step (2) and coal dust are sent into once, the water vapour that produces with step (1) once gasifies in the wet gasifying device in once; Wherein the addition of coal dust is 7% of powdery biomass butt quality, once in the temperature of wet remain in 350 ~ 450 ℃ of scopes, pass into water vapour in the warm device in once after, relative humidity is about 9%, obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain tar in the gas, in addition forming section biological carbon and ash content;
(4) the secondary high-temperature gasification installation is led in the combustion gas that obtains behind the wet in once, and once the biological carbon that obtains of gasification is transported in the tar-removing device after the secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) combustion gas that wet obtains in inciting somebody to action once is transported to the secondary high-temperature gasification installation and carries out the secondary high-temperature gasification, and the temperature of secondary high-temperature gasification is controlled in 1200 ~ 1300 ℃ of scopes, and obtaining main component after the gasification is CO, CO
2, H
2, CH
4Combustion gas, contain a small amount of tar in the gas, and produce a small amount of ash content;
(6) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the tar in the combustion gas; The heat exchange system that is equipped with makes the main body process temperature of tar rough purification be lower than 50 ℃, and waste heat gas carries out preheating and drying to rice husk, tabacco straw, and after the effect through biological carbon in the tar-removing device, the coal-tar middle oil amount of combustion gas reduces about 90%;
(7) combustion gas behind the tar removing is transported to refining plant and adopts ordinary method further to purify, remove the impurity such as dust in the combustion gas, further purifying gas makes the indexs such as dust, tar meet gasifying biomass combustible gas performance index, and dust and tar content are 5 ~ 8 mg/m
3, the low heat value of finished product combustion gas is about 15.8 MJ/m
3
Claims (2)
1. biomass and the coal method of combustion gas processed altogether is characterized in that carrying out as follows:
(1) biomass powder is broken to particle diameter less than 2cm, preheating also is dried to water ratio and is lower than 5%, and the moisture vapor transport that produces in the drying process is in once in the wet process;
(2) after dry crushing material to particle diameter less than 1mm, obtain the powdery biomass;
(3) powdery biomass and coal dust are sent into once in the middle wet gasifying device, under 300-500 ℃, gasify, wherein the addition of coal dust is the 5-10% of powdery biomass butt quality, and once the relative humidity in the middle wet reaction unit is controlled in 7% ~ 10% scope; The biological slag that once obtains behind the middle wet is put into tar-removing device as the tar removing material, the biological slag behind the enrichment tar, grinding to particle diameter less than 0.5mm, make and contain the tar biological carbon;
(4) combustion gas that obtains behind the wet in will be once and/or contain the tar biological carbon and pass into the secondary high-temperature gasification installation carry out the secondary high-temperature gasification under 1100-1300 ℃, the addition that wherein contains the tar biological carbon is 0 ~ 0.15 t/m
3H;
(5) combustion gas that obtains of secondary high-temperature gasification is transported to tar-removing device, removes the tar in the combustion gas, then is transported in the refining plant further to purify, and heat exchange is carried out in combustion gas after purifying, and makes finished product combustion gas and waste heat.
2. described biomass and the coal method of combustion gas processed altogether according to claim 1, it is characterized in that: the waste heat that heat exchange produces is used for the drying of step (1) Raw biomass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310059969.1A CN103074113B (en) | 2013-02-26 | 2013-02-26 | Method for preparing gas by using biomass and coal |
Applications Claiming Priority (1)
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| CN104212492A (en) * | 2013-06-04 | 2014-12-17 | 蒋寿悟 | Method for making gas by burning cow dung |
| CN105018148A (en) * | 2015-08-05 | 2015-11-04 | 中国东方电气集团有限公司 | Sleeve type plasma gasification reacting furnace and process thereof |
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