CN112048329B - Multi-raw-material collaborative pyrolysis treatment method for straw agricultural film - Google Patents
Multi-raw-material collaborative pyrolysis treatment method for straw agricultural film Download PDFInfo
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 221
- 239000010902 straw Substances 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002994 raw material Substances 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001257 hydrogen Substances 0.000 claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 19
- 239000000779 smoke Substances 0.000 claims description 18
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000002028 Biomass Substances 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 14
- 239000003921 oil Substances 0.000 abstract description 12
- 239000012075 bio-oil Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005984 hydrogenation reaction Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000012773 agricultural material Substances 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
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- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
本发明公开了一种秸秆农膜多原料协同热解处理方法，属于废弃物处理领域，以解决现有方法难以有效提高生物质热解气和生物油质量的问题。本发明将秸秆和农膜在相对独立的热解条件下进行热解，农膜热解产生的高温烟气为秸秆热解提供热量，同时农膜热解为秸秆热解提供富氢气氛。此方法不仅利用了农膜反应室热解后高温油气的显热，为秸秆热解提供能量，无需单独提供生物质热解热源，还将农膜中的富氢有效地转移到秸秆热解过程中,使得农膜热解产生的富氢气体与秸秆热解反应室会产生一定的加氢饱和作用，有助于提高热解油的收率。此方法降低了运行成本，提高了工艺经济性，易于工业化推广。
The invention discloses a multi-raw material synergistic pyrolysis treatment method for straw agricultural film, which belongs to the field of waste treatment and solves the problem that the existing methods cannot effectively improve the quality of biomass pyrolysis gas and bio-oil. In the invention, the straw and the agricultural film are pyrolyzed under relatively independent pyrolysis conditions, the high-temperature flue gas generated by the agricultural film pyrolysis provides heat for the straw pyrolysis, and at the same time, the agricultural film pyrolysis provides a hydrogen-rich atmosphere for the straw pyrolysis. This method not only utilizes the sensible heat of high-temperature oil and gas after pyrolysis in the agricultural film reaction chamber to provide energy for the pyrolysis of straw without providing a separate biomass pyrolysis heat source, but also effectively transfers the hydrogen-rich in the agricultural film to the straw pyrolysis process. The hydrogen-rich gas produced by the pyrolysis of agricultural film and the straw pyrolysis reaction chamber will have a certain hydrogenation saturation effect, which will help to improve the yield of pyrolysis oil. This method reduces the operating cost, improves the process economy, and is easy to promote in industrialization.
Description
Technical Field
The invention belongs to the field of waste treatment, and particularly relates to a multi-raw-material collaborative pyrolysis treatment method for a straw agricultural film.
Background
Currently, agricultural films have become indispensable agricultural materials together with seeds, fertilizers and pesticides, and the use area of the agricultural films is increased year by year. The agricultural film has three main raw materials, namely polyvinyl chloride, polyethylene and a regenerated film (black). As a high molecular compound, the agricultural film is extremely difficult to degrade (self-decompose) and is not easy to be corroded by microorganisms, the degradation period is generally 200-300 years, and toxic and harmful substances can be dissolved out in the degradation process. The discarded agricultural film reaches 178887 tons every year, and the common treatment methods include recovery and regeneration, landfill, incineration and the like. However, due to the problems of high cost, incomplete technology and the like, most agricultural films are actually stacked on the field and two sides of a river channel, and are unattended, so that landscape pollution flying with wind is caused; or enter river channels and water bodies along with the rain wash, so as to pollute the environment; or the waste water is burnt on site, which causes serious secondary pollution to the environment. The waste agricultural film pyrolysis recycling technology is one of important technologies for solving the pollution of agricultural films.
In recent years, crop straws become a new source of non-point source pollution in rural areas. In summer and autumn and winter every year, a large amount of straws of wheat, corn and the like are incinerated in the field, a large amount of dense smoke is generated, and the straw incineration method not only becomes a bottleneck problem of rural environment protection, but also even becomes a chief culprit of compromising urban environment. According to relevant statistics, as a big agricultural country, China can generate more than 7 hundred million tons of straws every year, and the straws become wastes which are not used much but need to be disposed. Pyrolysis technology for biomass such as straw
Polyethylene and polyvinyl chloride materials such as agricultural films are high molecular polymers artificially synthesized by using natural resources such as petroleum, natural gas, carbon and the like as raw materials, and have the characteristic of high hydrogen content (for example, polyolefin contains about 14 percent of hydrogen). Pyrolysis of such polymers at elevated temperatures under inert atmosphere or vacuum conditions can liberate many hydrocarbons which can be the primary reaction product. Pyrolysis of the polymer at higher temperatures (above 700 ℃) can yield predominantly low paraffins and chain hydrocarbons.
Pyrolysis of biomass produces three types of products: gas, bio-oil or bio-char. Pyrolysis of cellulose and major component studies of lignin indicate that bio-oil is produced by the radical channels of thermal cracking containing oxygen-bonded bonds. The biochar is generated by dehydrogenation of carbohydrate monomers during the zipper reaction of the cellulose chains. In the pyrolysis reaction in the hydrogen atmosphere, as the biomass is concentrated to generate less carbon, and the thermal cracking products are re-concentrated or recombined, the biomass can generate a large amount of liquid products.
Pyrolysis gas generated after the agricultural film is pyrolyzed is hydrogen-rich gas and can supply hydrogen to the straw pyrolysis reaction, so that free radicals generated by biomass pyrolysis are stabilized, and the oil-forming conversion of the straw is promoted. In addition, hydrogen provided by the agricultural film pyrolysis can also effectively reduce the oxygen content and improve the heat value of the oil, so that the quality of the bio-oil is obviously improved.
At present, biomass pyrolysis processes comprise biomass single pyrolysis, biomass-plastic co-pyrolysis and the like. The single biomass pyrolysis technology has the problems of high oxygen content, low effective hydrogen-carbon ratio and high energy consumption in the process of preparing fuel oil by independently cracking biomass. The biomass-plastic co-pyrolysis directly mixes plastic materials such as agricultural films and straw materials to react under the same pyrolysis condition, but the heat transfer and mass transfer performances of the agricultural films and the straws are different, the optimal reaction temperature and time and catalysts of the straws and the agricultural films are different, the pyrolysis can not reach higher efficiency simultaneously under the same condition, the generation of pyrolysis products has primary and secondary components, the components are complex, and the quality of biomass pyrolysis gas and bio-oil is difficult to effectively improve.
Disclosure of Invention
The invention aims to provide a method for the synergistic pyrolysis of biomass and agricultural films, which aims to solve the problem that the quality of biomass pyrolysis gas and bio-oil is difficult to effectively improve by the existing method.
The technical scheme of the invention is as follows: a multi-raw material collaborative pyrolysis treatment method for straw agricultural films comprises the following steps:
s1, removing impurities from the agricultural film and the straw, drying and crushing;
s2, feeding the agricultural film and the straws into an agricultural film pyrolysis furnace and a straw pyrolysis furnace respectively through different feeding devices;
s3, pyrolyzing the agricultural film and the straw, wherein the pyrolysis temperature of the agricultural film is controlled to be 780-820 ℃;
s4, introducing pyrolysis gas generated by agricultural film pyrolysis into a straw pyrolysis furnace, and adding hydrogen-rich atmosphere for straw pyrolysis; the temperature of straw pyrolysis is 450-590 ℃;
s5, recycling the high-temperature flue gas after the agricultural film is pyrolyzed and utilized, and introducing the flue gas into a high-temperature flue cavity of the straw pyrolyzing furnace to provide a heat source for straw pyrolysis.
Further, in the step S4, the flow rate of the high-temperature flue gas is adjusted through an induced draft fan, so that the temperature of the high-temperature flue gas after heat exchange with the agricultural film pyrolysis furnace is 550-630 ℃.
Furthermore, the horizontal position of the straw pyrolysis furnace is higher than that of the agricultural film pyrolysis furnace, and a pyrolysis gas inlet device and a high-temperature flue are connected between the straw pyrolysis furnace and the furnace body of the agricultural film pyrolysis furnace; the feeding direction of the agricultural film pyrolyzing furnace is opposite to that of the straw pyrolyzing furnace.
Furthermore, a filter screen is arranged at a flue gas outlet of the agricultural film pyrolysis furnace, and then the agricultural film pyrolysis furnace enters a pyrolysis gas inlet device after being treated by a charcoal catalyst and enters the straw pyrolysis furnace through a pressure relief tank and a control valve.
Furthermore, a pyrolysis gas flow control module is arranged on the pyrolysis gas inlet device.
Further, the wall of the agricultural film pyrolysis furnace is provided with an agricultural film pyrolysis furnace high-temperature smoke cavity, and a smoke cavity partition plate is arranged in the agricultural film pyrolysis furnace high-temperature smoke cavity; the outer wall of the agricultural film pyrolyzing furnace is provided with an agricultural film pyrolyzing furnace heat preservation layer.
The invention has the following characteristics:
(1) the process method is innovative, the straws and the agricultural film are pyrolyzed under relatively independent pyrolysis conditions by virtue of straw-agricultural film collaborative pyrolysis, high-temperature flue gas generated by the pyrolysis of the agricultural film provides heat for the pyrolysis of the straws, and meanwhile, the pyrolysis of the agricultural film provides a hydrogen-rich atmosphere for the pyrolysis of the straws. The method not only utilizes sensible heat of high-temperature oil gas after pyrolysis of the agricultural film reaction chamber to provide energy for straw pyrolysis, and a biomass pyrolysis heat source is not required to be provided independently, but also effectively transfers hydrogen rich in the agricultural film to the straw pyrolysis process, so that hydrogen rich gas generated by agricultural film pyrolysis and the straw pyrolysis reaction chamber can generate a certain hydrogenation saturation effect, and the yield of pyrolysis oil is improved. The method reduces the operation cost, improves the process economy and is easy for industrialized popularization.
(2) The invention can fully utilize the agricultural film pyrolysis to supply hydrogen for straw pyrolysis and improve the quality, and effectively improve the yield and the quality of the pyrolysis oil. And high-temperature flue gas generated after pyrolysis of the agricultural film can be used for providing a heat source for straw pyrolysis, so that the energy efficiency is improved.
(3) The pipeline is provided with a pyrolysis gas flow control module, and the rear end of the pyrolysis furnace is provided with an induced draft fan, so that pyrolysis gas is uniformly distributed in the straw pyrolysis furnace and slowly flows from front to back, an excellent hydrogen-rich atmosphere is created for straw pyrolysis, and the speed and quality of straw pyrolysis are improved.
(4) The method can simultaneously solve the pollution problem of two agricultural wastes of straws and agricultural films, and has certain economic benefit.
Drawings
FIG. 1 is a flow chart of a method for the multi-raw material collaborative pyrolysis treatment of a straw agricultural film;
FIG. 2 is a schematic structural diagram of equipment used in a method for the multi-raw material collaborative pyrolysis treatment of the agricultural film of straw.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in the figure, the agricultural film pyrolysis furnace 13 is arranged on a furnace frame 20, and the agricultural film pyrolysis furnace 13 is connected with a burner 19.
The utility model provides a many raw materialss of straw plastic sheeting are pyrolysis processing system in coordination, includes straw processing system and plastic sheeting, and straw processing system is located plastic sheeting's top, and straw processing system includes straw pyrolysis oven 5, straw pyrolysis oven feed arrangement 8, straw pyrolysis oven discharging device 1, and the one end of straw pyrolysis oven 5 is equipped with straw pyrolysis oven feed arrangement 8, and the other end of straw pyrolysis oven 5 is equipped with straw pyrolysis oven discharging device 1.
Agricultural film processing system includes agricultural film pyrolysis oven 13, agricultural film pyrolysis oven feed inlet 2, agricultural film pyrolysis oven discharging device 10, and the one end of agricultural film pyrolysis oven 13 is equipped with agricultural film pyrolysis oven feed inlet 2, and the other end of agricultural film pyrolysis oven 13 is equipped with agricultural film pyrolysis oven discharging device 10, and the feeding direction of agricultural film pyrolysis oven is opposite with the feeding direction of straw pyrolysis oven.
The wall of the agricultural film pyrolysis furnace 13 is provided with an agricultural film pyrolysis furnace high-temperature smoke cavity 15, and a smoke cavity clapboard 14 is arranged in the agricultural film pyrolysis furnace high-temperature smoke cavity 15; the outer wall of the agricultural film pyrolyzing furnace 13 is provided with an agricultural film pyrolyzing furnace insulating layer 16.
An agricultural film conveying device 17 is arranged in the agricultural film pyrolysis furnace 13, and a boosting plate 18 is arranged on the agricultural film conveying device 17; the agricultural film conveying device 17 is connected with a transmission device 11. The agricultural film pyrolysis furnace utilizes a conveying belt with a partition plate to uniformly and continuously distribute the agricultural film.
The horizontal position of the straw pyrolysis furnace 5 is higher than that of the agricultural film pyrolysis furnace 13, and the straw pyrolysis furnace and the agricultural film pyrolysis furnace are connected together through a furnace frame 20. A pyrolysis gas inlet device 9 and a high-temperature flue 12 are connected between the straw pyrolysis furnace 5 and the agricultural film pyrolysis furnace 13. A straw pyrolysis furnace helical blade 6 is arranged in the straw pyrolysis furnace high-temperature smoke cavity 4 of the straw pyrolysis furnace 5. The discharge end of the straw pyrolysis furnace 5 is provided with a pyrolysis furnace induced draft fan 3.
The pyrolysis gas inlet device is provided with a pyrolysis gas flow control module 95 for hydrogen-rich pyrolysis gas of the agricultural film pyrolysis furnace to uniformly flow into the straw pyrolysis furnace and the flow rate and concentration of the gas are adjusted by using the control device. The pyrolysis gas flow control module can be a digital mass flow controller with the model of ACU10FD-BC of ACCU Beijing precision technology Limited.
Thermometers 7 are arranged in the straw pyrolysis furnace 5 and the agricultural film pyrolysis furnace 13. Pyrolysis temperature measuring points are arranged in the two pyrolysis furnaces, and the temperature environment in the pyrolysis furnaces is monitored in real time through thermometers.
The principle of the invention is as follows: hydrogen-rich pyrolysis gas generated in the agricultural film pyrolysis furnace after pyrolysis reaction enters the straw pyrolysis furnace from the discharge end of the agricultural film pyrolysis furnace through the pyrolysis gas channel, flows to an outlet under a negative pressure environment, provides a hydrogenation atmosphere for the pyrolysis reaction in the straw pyrolysis furnace, and effectively improves the biomass liquefaction efficiency and the liquefied oil quality by realizing the synergistic pyrolysis of the straw and the agricultural film.
High temperature flue gas that agricultural film pyrolysis oven produced flows into agricultural film pyrolysis oven high temperature smoke chamber 15 in, constantly detours between smoke chamber baffle 14 and passes through, provides the heat for agricultural film pyrolysis oven, reduces the energy consumption. And then, the high-temperature flue gas enters a high-temperature flue cavity of the straw pyrolysis furnace through the high-temperature flue to be reused, and the waste heat is used for continuously providing heat for the straw pyrolysis furnace.
Example 1
And cleaning and drying the straw agricultural film to ensure that the water content is less than 5 percent. Drying and crushing into small sections, wherein the grain size of the straw is less than 2cm, and the grain size of the agricultural film is less than 4 cm.
Respectively conveying the straws and the agricultural film to two pyrolysis furnaces according to the mass ratio of 3: 1.
The agricultural film falls into the conveyer inside the pyrolysis furnace at the feed inlet of the agricultural film pyrolysis furnace, and is evenly and continuously distributed inside the pyrolysis furnace under the pushing of the partition plate. The burner is started, high-temperature smoke generated by the burner flows in a bypassing way in a high-temperature smoke cavity of the agricultural film pyrolysis furnace to provide heat for agricultural film pyrolysis, the heating time of the agricultural film is controlled to be 35min through the rotation rate of the partition plate, and the pyrolysis temperature is controlled to be 820 ℃. Adjust high temperature flue gas flow rate and heat exchange efficiency through the rear end induced air, guarantee that the high temperature flue gas is 630 ℃ with the temperature behind the agricultural film pyrolysis furnace heat transfer, then let in the smoke chamber of straw pyrolysis furnace, provide the heat for the straw pyrolysis, guarantee that the straw pyrolysis temperature is 590 ℃.
The rotating speed of the straw rotary furnace is controlled by the variable frequency motor, and the heating time of the straw in the rotary furnace is ensured to be 40 min.
In the agricultural film pyrolysis furnace, agricultural film is heated and is cracked the back and produce a large amount of hydrogen-rich pyrolysis gas, pyrolysis gas gets into pyrolysis gas air inlet unit, agricultural film pyrolysis furnace gas outlet 90 departments are equipped with filter equipment, filter impurity such as residual carbon through the filter screen earlier, then under the effect of charcoal catalyst, get into the straw pyrolysis furnace through slow-pressure jar and control valve, and fully contact with straw pyrolytic reaction's semicoke, take place out of phase reaction, through rear end induced air system control pyrolysis air current, build favorable gaseous environment for straw pyrolytic reaction.
The straw adopts the mode of spiral feeding, and under straw pyrolysis feed arrangement's effect, the even unanimous propelling movement of raw materials in the straw hopper is to the pyrolysis oven in, and the upset advances in spiral straw pyrolysis oven, is heated decomposition under the effect of high temperature flue gas simultaneously, experiences dry dehydration, two processes of pyrolysis, produces products such as pyrolysis oil, biochar. The top of the straw pyrolysis furnace is provided with a pyrolysis gas outlet through which pyrolysis oil gas and semicoke powder enter a subsequent product separation and refining system.
Example 2
The difference with the embodiment lies in that the agricultural film pyrolysis temperature is controlled at 780 ℃, the flow rate and the heat exchange efficiency of the high-temperature flue gas are adjusted through rear-end induced air, the temperature of the high-temperature flue gas after heat exchange with the agricultural film pyrolysis furnace is ensured to be 550 ℃, and then the high-temperature flue gas is introduced into a smoke cavity of the straw pyrolysis furnace to provide heat for straw pyrolysis, and the temperature of the straw pyrolysis is ensured to be 450 ℃.
Example 3
The difference with the embodiment lies in that the agricultural film pyrolysis temperature is controlled at 800 ℃, the flow rate and the heat exchange efficiency of the high-temperature flue gas are adjusted through rear-end induced air, the temperature of the high-temperature flue gas after heat exchange with the agricultural film pyrolysis furnace is ensured to be 600 ℃, and then the high-temperature flue gas is introduced into a smoke cavity of the straw pyrolysis furnace to provide heat for straw pyrolysis, and the temperature of the straw pyrolysis is ensured to be 500 ℃.
Examination of the products of the examples
The water content of the refined straw pyrolysis oil is measured by using an LXT-200 moisture meter, the oxygen content of the pyrolysis oil is measured by using an EA 2400 II type element analyzer, the high-grade calorific value of the pyrolysis oil is measured by using a ZDHW-8000A calorimeter, and the results show that: the water content is 12 percent, the oxygen content is only 3.56 percent, the high-grade heat value reaches 35MJ/kg, and the heat value is obviously improved compared with other pyrolysis methods.
The composition of the fuel gas was analyzed by gas chromatography to find that: the obtained fuel gas mainly contains 33 percent of CO and CH4Ratio of 21%, H 218% by weight of C2H4、C2H6、C3H6And the like. The heat value is about 20MJ/kg and is higher than the heat productivity of water gas and methane.
Claims (6)
1. A multi-raw material collaborative pyrolysis treatment method for straw agricultural films is characterized by comprising the following steps:
s1, removing impurities from the agricultural film and the straw, drying and crushing;
s2, feeding the agricultural film and the straws into an agricultural film pyrolysis furnace and a straw pyrolysis furnace respectively through different feeding devices;
s3, pyrolyzing the agricultural film and the straw, wherein the pyrolysis temperature of the agricultural film is controlled to be 780-820 ℃;
s4, introducing pyrolysis gas generated by agricultural film pyrolysis into a straw pyrolysis furnace, and adding hydrogen-rich atmosphere for straw pyrolysis; the temperature of straw pyrolysis is 450-590 ℃;
s5, recycling the high-temperature flue gas after the agricultural film is pyrolyzed and utilized, and introducing the flue gas into a high-temperature flue cavity of the straw pyrolyzing furnace to provide a heat source for straw pyrolysis.
2. The multi-raw-material collaborative pyrolysis treatment method for the straw agricultural film according to claim 1, characterized in that: and in the step S4, the flow rate of the high-temperature flue gas is adjusted by the induced draft fan, so that the temperature of the high-temperature flue gas after heat exchange with the agricultural film pyrolysis furnace is 550-630 ℃.
3. The multi-raw-material collaborative pyrolysis treatment method for the straw agricultural film according to claim 1 or 2, characterized in that: the horizontal position of the straw pyrolysis furnace (5) is higher than that of the agricultural film pyrolysis furnace (13), and a pyrolysis gas inlet device (9) and a high-temperature flue (12) are connected between the straw pyrolysis furnace (5) and a furnace body of the agricultural film pyrolysis furnace (13);
the feeding direction of the agricultural film pyrolyzing furnace is opposite to that of the straw pyrolyzing furnace.
4. The multi-raw-material collaborative pyrolysis treatment method for the straw agricultural film according to claim 3, characterized in that: a filter screen is arranged at a flue gas outlet of the agricultural film pyrolysis furnace, and then the agricultural film pyrolysis furnace enters a pyrolysis gas inlet device (9) after being treated by a biochar catalyst and enters the straw pyrolysis furnace through a pressure-reducing tank and a control valve.
5. The multi-raw-material collaborative pyrolysis treatment method for the straw agricultural film according to claim 4, characterized in that: and a pyrolysis gas flow control module (95) is arranged on the pyrolysis gas inlet device.
6. The multi-raw-material collaborative pyrolysis treatment method for the straw agricultural film according to claim 5, characterized in that: the wall of the agricultural film pyrolysis furnace (13) is provided with an agricultural film pyrolysis furnace high-temperature smoke cavity (15), and a smoke cavity clapboard (14) is arranged in the agricultural film pyrolysis furnace high-temperature smoke cavity (15); the outer wall of the agricultural film pyrolyzing furnace (13) is provided with an agricultural film pyrolyzing furnace heat insulating layer (16).
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| CN207933352U (en) * | 2017-11-22 | 2018-10-02 | 盐城工学院 | A kind of device of biomass and waste plastics preparing bio-oil and combustion gas |
| CN110229707A (en) * | 2019-07-25 | 2019-09-13 | 祖柏实 | A kind of agriculture and forestry organic waste material low temperature pyrogenation high heating value granular fuel production equipment and process |
| CN111662731A (en) * | 2020-05-26 | 2020-09-15 | 汕头市谷源新能源有限公司 | Treatment method of waste plastics of paper mill |
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| CN207933352U (en) * | 2017-11-22 | 2018-10-02 | 盐城工学院 | A kind of device of biomass and waste plastics preparing bio-oil and combustion gas |
| CN110229707A (en) * | 2019-07-25 | 2019-09-13 | 祖柏实 | A kind of agriculture and forestry organic waste material low temperature pyrogenation high heating value granular fuel production equipment and process |
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