CN103074113B - 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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- CN103074113B CN103074113B CN201310059969.1A CN201310059969A CN103074113B CN 103074113 B CN103074113 B CN 103074113B CN 201310059969 A CN201310059969 A CN 201310059969A CN 103074113 B CN103074113 B CN 103074113B
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- 239000002028 Biomass Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000003245 coal Substances 0.000 title claims abstract description 19
- 238000002309 gasification Methods 0.000 claims abstract description 60
- 239000002918 waste heat Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 17
- 239000000567 combustion gas Substances 0.000 claims description 79
- 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
- 239000002893 slag Substances 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 35
- 239000002699 waste material Substances 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 10
- 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 67
- 239000000428 dust Substances 0.000 description 13
- 239000003921 oil Substances 0.000 description 10
- 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
- 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
- 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
- 238000002156 mixing Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004215 Carbon black (E152) Substances 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
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 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
- 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
Classifications
-
- 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 method of utilizing the agriculture biomass waste producing and coal jointly to prepare combustion gas, make full use of biomass and produce combustion gas under the synergy of coal, belong to changing waste into resources, new energy field.
Background technology
Tellurian biomass net response is huge, is equivalent to 10 times of current world total energy consumption, has great exploitation, utilizes potentiality.
China's agroforestry are produced and are occupied critical role, in agroforestry production and agricultural byproducts processing process, produce a large amount of biomass wastes, 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 exceedes 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.The large solid waste comprehensive utilization of the < < embodiment > > of < < " 12 " utilization of resources instruction > > proposes, the target of straw utilization rate in 2015 is 80%, seek low cost, efficiently, straw utilization approach easily, be 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 higher, substantially higher than 18000 kJ/kg.China's biomass waste output is large, its higher calorific value feature in addition, and biomass waste has formed a potential huge energy sink.
China is an energy consumption big country, and prospective oil is less, large to Imported oil dependency; Natural gas reserves is also limited; Domestic main energy substance is coal, and Coal Mine Coal Reserve is larger, but colliery is Nonrenewable resources.From long term growth, have to consider the at every moment energy dilemma of existence.Biomass energy is renewable resources, and making full use of biomass waste can reduce the pollution of waste to environment on the one hand, on the other hand can alleviating energy crisis.
At present, utilize biomass-making much paid close attention to and study for combustion gas.Publication number is the system and method that CN 101774542 A disclose a kind of biomass gasifying hydrogen making, adopt biomass gasifying hydrogen making and chemical bond to burn and combine, take metal oxide as thermal barrier and the system that circulates between three of oxygen carrier realize low CO
2discharge hydrogen manufacturing.Publication number is that CN 101747945 A disclose a kind of method that two-stage type biomass is prepared synthetic gas, the method is by biomass cracking, obtain charcoal and bio-crude oil, the oil carbon that utilizes transferpump that bio-crude oil or charcoal and bio-crude oil are mixed with is starched and is sent into gasifier system for synthetic gas.In these method gas-making processes or need external system that water vapour is provided, or need catalyzer, or limited to the burnt oil handling producing in cracking process.
Summary of the invention
The object of the invention is to provide a kind of biomass and the coal method of combustion gas processed altogether, the method is take biomass as main raw material, add a certain amount of coal and prepare biological fuel gas, preparation method mainly comprises preheating and drying, once middle wet, secondary high-temperature gasification and gas-purification supervisor, wherein utilize the waste heat preheating and drying biomass of combustion gas, the water vapour that preheating and drying step produces is used as the once vaporized chemical of middle wet, the biological carbon that once gasification produces is for removing the tar of combustion gas, charcoal after tar removing carries out secondary high-temperature gasification through pulverizing with the combustion gas that once gasification produces, tar is removed in combustion gas after secondary high-temperature gasification, after further purifying, make required combustion gas.
The present invention is achieved through the following technical solutions:
(1) biomass are carried out to preliminary fragmentation, make its particle diameter be less than 2 cm, utilize subsequent handling waste heat to enter material is carried out to preheating and dry, dried water ratio is lower than 5%.The moisture vapor transport that drying process produces is to wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, after grinding, material particular diameter is less than 1 mm, obtains powder biomass;
(3) powder biomass that step (2) obtains and coal dust are sent into once middle wet gasifying device, the water vapour producing with step (1) once gasifies in wet gasifying device in once, the intake of water vapour is take the relative humidity in warm gasification reactor apparatus once as reference, relative humidity once in warm gasification reactor apparatus is controlled in 7% ~ 10% scope, the quality of pc wherein mixing 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) secondary high-temperature gasification installation is led in the combustion gas obtaining after wet in once, and the biological carbon that once gasification obtains is transported to the tar-removing device after secondary high-temperature gasification gas device, as tar removing material enrichment tar, can change continuously;
(5) biological carbon after tar removing in step (4) is carried out to grinding, after grinding material particle diameter be less than 0.5 mm, obtain grinding shape containing tar biological carbon;
(6) combustion gas wet in once being obtained and grinding shape are transported to secondary high-temperature gasification installation containing tar biological carbon to carry out secondary high-temperature gasification and (containing the addition of tar biological carbon, with the generation of biological carbon and the volume of reactor, determines, be controlled at 0 ~ 0.15 t/m
3h), the temperature of secondary high-temperature gasification is controlled at 1100 ~ 1300 ℃, obtains combustion gas;
(7) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the impurity such as tar in combustion gas, and this step is furnished with heat exchanger, reduces temperature to promote adsorption cleaning, and utilizes waste heat gas to carry out preheating and dry to the biomass of preliminary fragmentation;
(8) combustion gas after tar removing is transported to refining plant and further purifies, and removes the impurity such as the dust in 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, and energy-conservation, minimizing waste discharge again; Step (3) biological carbon that once middle wetization produces is 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 under certain thermodynamic condition, thermo-cracking, redox reaction can occur biomolecules, generates micro-molecular gas, biological carbon and ash content.Biomass start gasification under 300 ℃ of temperature condition, generate CO, CO
2, H
2, CH
4, the material such as tar, biological carbon, when temperature during higher than 800 ℃ tar start cracking, when temperature is 1100 ℃ ~ 1300 ℃, overwhelming majority tar is cleaved, 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;
In the present invention, biomass refer in agroforestry production and agricultural byproducts processing process and produce a large amount of biomass wastes, 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 efficiency.The utilization of biomass preheating and drying process be the waste heat producing in technique, the water vapour that drying step produces, as the vaporized chemical of wet in once, is technique vaporized chemical is provided, and has reduced again the discharge of refuse.In gasification point 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 obtaining can be used as the coal-tar middle oil removal material of combustion gas.The biological carbon of tar removing turns back to secondary high-temperature gasification installation through grinding, with once in warm gasification burning 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 by heat exchanger cooling after purifying, and waste heat, for to initial biomass preheating and dry, makes full use of waste heat, save energy.
Whole technique has not only realized utilizes 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 technique, reduced pollution substance discharge and energy consumption, met the theory of cleaner production.
Accompanying drawing explanation
Fig. 1 is biomass of the present invention and the coal process flow diagram of combustion gas processed altogether.
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 to fragmentation, make its particle diameter be less than 2 cm, preheating to be dried to water ratio be 3%, stalk and cow dung mass ratio are 1:1, the waste heat obtaining by subsequent handling is to stalk and cow dung preheating and drying (during initial start-up, this step needs external source that heat is provided), and the moisture vapor transport that drying process produces is to wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, after grinding, material particular diameter is less than 1mm, obtains powdery biomass;
(3) the powdery biomass that step (2) obtains and coal dust are sent into once middle wet gasifying device, the water vapour producing with step (1) once gasifies in 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 within the scope of 300 ~ 450 ℃, once, in warm device, pass into after water vapour, relative humidity approximately 8%, after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain tar, in addition forming section biological carbon and ash content;
(4) secondary high-temperature gasification installation is led in the combustion gas obtaining after wet in once, and the biological carbon that once gasification obtains is transported in the tar-removing device after secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon after tar removing in step (4) is carried out to grinding, after grinding material particle diameter be less than 0.5 mm, obtain grinding shape containing tar biological carbon;
(6) combustion gas wet in once being obtained and grinding shape are transported to secondary high-temperature gasification installation containing tar biological carbon and carry out secondary high-temperature gasification, and grinding shape is 0.1 t/m containing the addition of tar biological carbon
3h, the temperature of secondary high-temperature gasification is controlled within the scope of 1100 ~ 1250 ℃, and after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain a small amount of tar, and produce a certain amount of ash content;
(7) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the tar in combustion gas, and the heat exchange system of outfit makes the main body process temperature of tar rough purification lower than 50 ℃, and waste heat gas carries out preheating and dry to stalk and cow dung; After the effect of biological carbon in tar-removing device, the coal-tar middle oil amount of combustion gas reduces approximately 90%;
(8) combustion gas after tar removing be transported to refining plant adopt ordinary method further purify, remove the impurity such as the dust in 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 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 to fragmentation, make its particle diameter be less than 2 cm, preheating to be dried to water ratio be 2%, stalk and cow dung mass ratio are 2:1, the waste heat obtaining by subsequent handling is to stalk and bean dregs preheating and drying (during initial start-up, this step needs external source that heat is provided), and the moisture vapor transport that drying process produces is to wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, after grinding, material particular diameter is less than 1mm, obtains powdery biomass.
(3) the powdery biomass that step (2) obtains and coal dust are sent into once middle wet gasifying device, the water vapour producing with step (1) once gasifies in wet gasifying device in once, the quality of pc wherein mixing is 8% of powder biomass, once the temperature of middle wet remains within the scope of 350 ~ 400 ℃, once, in warm device, pass into after water vapour relative humidity approximately 9%; After gasification, obtaining main component is CO, CO2, H
2, CH
4combustion gas, in gas, contain tar, in addition forming section biological carbon and ash content;
(4) secondary high-temperature gasification installation is led in the combustion gas obtaining after wet in once, and the biological carbon that once gasification obtains is transported in the tar-removing device after secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon after tar removing in step (4) is carried out to grinding, after grinding material particle diameter be less than 0.5 mm, obtain grinding shape containing tar biological carbon;
(6) combustion gas wet in once being obtained and grinding shape are transported to secondary high-temperature gasification installation containing tar biological carbon and carry out secondary high-temperature gasification, and grinding shape is 0.08 t/m containing the addition of tar biological carbon
3h, the temperature of secondary high-temperature gasification is controlled within the scope of 1150 ~ 1300 ℃, and after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain a small amount of tar, and produce a certain amount of ash content;
(7) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the tar in combustion gas, and the heat exchange system of outfit makes the main body process temperature of tar rough purification lower than 50 ℃.Waste heat gas carries out preheating and dry to stalk and cow dung; After the effect of biological carbon in tar-removing device, the coal-tar middle oil amount of combustion gas reduces approximately 90%;
(8) combustion gas after tar removing be transported to refining plant adopt ordinary method further purify, remove the impurity such as the dust in 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 15.5 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 to fragmentation, make its particle diameter be less than 2 cm, preheating to be dried to water ratio be 3%, wood chip, branches and leaves mass ratio are 1:2, the waste heat obtaining by subsequent handling is to wood chip, branches and leaves preheating and drying (during initial start-up, this step needs external source that heat is provided), and the moisture vapor transport that drying process produces is to wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, after grinding, material particular diameter is less than 1 mm, obtains powder biomass;
(3) powder biomass that step (2) obtains and coal dust are sent into once middle wet gasifying device, and the water vapour producing with step (1) once gasifies in 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 within the scope of 350 ~ 500 ℃, pass into after water vapour in warm device in once, relative humidity approximately 7%, after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain tar, in addition forming section biological carbon and ash content;
(4) secondary high-temperature gasification installation is led in the combustion gas obtaining after wet in once, and the biological carbon that once gasification obtains is transported in the tar-removing device after secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) biological carbon after tar removing in step (4) is carried out to grinding, after grinding material particle diameter be less than 0.5 mm, obtain grinding shape containing tar biological carbon,
(6) combustion gas wet in once being obtained and grinding shape are transported to secondary high-temperature gasification installation containing tar biological carbon and carry out secondary high-temperature gasification, and grinding shape is 0.14 t/m containing the addition of tar biological carbon
3h, the temperature of secondary high-temperature gasification is controlled within the scope of 1100 ~ 1200 ℃, and after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain a small amount of tar, and produce a certain amount of ash content;
(7) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the tar in combustion gas; The heat exchange system being equipped with makes the main body process temperature of tar rough purification lower than 50 ℃.Waste heat gas carries out preheating and dry to stalk and cow dung, and after the effect of biological carbon in tar-removing device, the coal-tar middle oil amount of combustion gas reduces approximately 90%;
(8) combustion gas after tar removing be transported to refining plant adopt ordinary method further purify, remove the impurity such as the dust in 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 to fragmentation, make its particle diameter be less than 2 cm, preheating to be dried to water ratio be 3%, rice husk, tabacco straw mass ratio are 3:2, the waste heat obtaining by subsequent handling is to rice husk, tabacco straw preheating and drying (during initial start-up, this step needs external source that heat is provided), and the moisture vapor transport that drying process produces is to wet gasifying device in once;
(2) the dried material of step (1) is sent into milling equipment, after grinding, material particular diameter is less than 1 mm, obtains powder biomass;
(3) powder biomass that step (2) obtains and coal dust are sent into once middle wet gasifying device, and the water vapour producing with step (1) once gasifies in 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 within the scope of 350 ~ 450 ℃, pass into after water vapour in warm device in once, relative humidity approximately 9%, after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain tar, in addition forming section biological carbon and ash content;
(4) secondary high-temperature gasification installation is led in the combustion gas obtaining after wet in once, and the biological carbon that once gasification obtains is transported in the tar-removing device after secondary high-temperature gasification gas device as tar removing material enrichment tar, can change continuously;
(5) combustion gas that once middle wet obtains is transported to secondary high-temperature gasification installation and carries out secondary high-temperature gasification, the temperature of secondary high-temperature gasification is controlled within the scope of 1200 ~ 1300 ℃, and after gasification, obtaining main component is CO, CO
2, H
2, CH
4combustion gas, in gas, contain a small amount of tar, and produce a small amount of ash content;
(6) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the tar in combustion gas; The heat exchange system being equipped with makes the main body process temperature of tar rough purification lower than 50 ℃, and waste heat gas carries out preheating and dry to rice husk, tabacco straw, and after the effect of biological carbon in tar-removing device, the coal-tar middle oil amount of combustion gas reduces approximately 90%;
(7) combustion gas after tar removing be transported to refining plant adopt ordinary method further purify, remove the impurity such as the dust in 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. a biomass and coal method for combustion gas processed altogether, is characterized in that carrying out as follows:
(1) biomass powder is broken to particle diameter and is less than 2cm, preheating is also dried to water ratio lower than 5%, and the moisture vapor transport producing in drying process is in warm gasification in once;
(2) dry rear crushing material to particle diameter is less than 1mm, obtains powdery biomass;
(3) powdery biomass and coal dust are sent into once in middle wet gasifying device, at 300-450 ℃, gasify, wherein the addition of coal dust is the 5-10% of powdery biomass butt quality, once in relative humidity in warm gasification reactor apparatus be controlled in 7% ~ 10% scope; The biological slag once obtaining after middle wet is put into tar-removing device as tar removing material, the biological slag after enrichment tar, and grinding to particle diameter is less than 0.5mm, makes containing tar biological carbon;
(4), by the combustion gas obtaining after wet in once and/or pass into secondary high-temperature gasification installation containing tar biological carbon carry out secondary high-temperature gasification at 1100-1300 ℃, containing the addition of tar biological carbon, be wherein 0 ~ 0.15 t/m
3h;
(5) the secondary high-temperature combustion gas obtaining of gasifying is transported to tar-removing device, removes the tar in combustion gas, carries out heat exchange in the tar removing stage simultaneously, obtains waste heat, after tar removing combustion gas be transported in refining plant and further purify, obtain finished product combustion gas.
2. biomass and the coal method of combustion gas processed altogether according to claim 1, is characterized in that: the waste heat that heat exchange produces is dry for 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103074113A CN103074113A (en) | 2013-05-01 |
| CN103074113B true CN103074113B (en) | 2014-05-07 |
Family
ID=48150815
Family Applications (1)
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| CN101012384A (en) * | 2007-01-31 | 2007-08-08 | 华东理工大学 | Method and device for preparing combustion gas by gasifying biomass |
| JP2012111913A (en) * | 2010-11-26 | 2012-06-14 | Mitsubishi Heavy Ind Ltd | Biomass gasification system and purification method of biomass gasification gas |
| CN102703131A (en) * | 2012-05-10 | 2012-10-03 | 中国科学院过程工程研究所 | Two-stage gasification method and gasification device for fuels with wide size distribution |
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| CN101962574B (en) * | 2010-09-30 | 2014-01-08 | 华东理工大学 | Clean synthesis gas and preparation method thereof |
| CN102660331A (en) * | 2012-05-30 | 2012-09-12 | 平顶山市三源制氢有限公司 | Pressure swing adsorption and vacuum desulphurization process for coke oven gas |
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| CN101012384A (en) * | 2007-01-31 | 2007-08-08 | 华东理工大学 | Method and device for preparing combustion gas by gasifying biomass |
| JP2012111913A (en) * | 2010-11-26 | 2012-06-14 | Mitsubishi Heavy Ind Ltd | Biomass gasification system and purification method of biomass gasification gas |
| CN102703131A (en) * | 2012-05-10 | 2012-10-03 | 中国科学院过程工程研究所 | Two-stage gasification method and gasification device for fuels with wide size distribution |
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