CN108728166B - Dry pyrolysis system for biomass gasification furnace and biomass gasification system - Google Patents
Dry pyrolysis system for biomass gasification furnace and biomass gasification system Download PDFInfo
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- CN108728166B CN108728166B CN201710245870.9A CN201710245870A CN108728166B CN 108728166 B CN108728166 B CN 108728166B CN 201710245870 A CN201710245870 A CN 201710245870A CN 108728166 B CN108728166 B CN 108728166B
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 170
- 238000002309 gasification Methods 0.000 title claims abstract description 71
- 239000002028 Biomass Substances 0.000 title claims abstract description 70
- 238000001035 drying Methods 0.000 claims abstract description 130
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000001154 acute effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 56
- 241000209094 Oryza Species 0.000 description 10
- 235000007164 Oryza sativa Nutrition 0.000 description 10
- 235000009566 rice Nutrition 0.000 description 10
- 239000010902 straw Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000191 radiation effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000004227 thermal cracking Methods 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
Abstract
The invention provides a dry pyrolysis system for a biomass gasification furnace and a biomass gasification system comprising the same. The drying pyrolysis system comprises a drying section structure, a pyrolysis section structure and an air lock (5), wherein the drying section structure is horizontally or obliquely arranged, and the pyrolysis section structure and the horizontal surface form an acute angle alpha in an oblique manner; the drying section structure comprises a drying section jacket outer cylinder (2) and a drying Duan Jiaolong (3) which are concentrically welded, a heat exchange plate, a drying section heating gas inlet (4), a drying section heating gas outlet (1) and a water vapor outlet (11); the pyrolysis section structure comprises a pyrolysis section jacket outer cylinder (7) and a pyrolysis Duan Jiaolong (8) which are concentrically welded, a heat exchange plate, a pyrolysis section heating gas inlet (9) and a pyrolysis section heating gas outlet (6). The dry pyrolysis system and the biomass gasification system are beneficial to comprehensive and efficient utilization of biomass, reduce energy consumption of enterprises and protect environment, and have excellent scientific research value and market value.
Description
Technical Field
The invention belongs to the technical field of biomass gasification, and particularly relates to a dry pyrolysis system for a biomass gasification furnace and a biomass gasification system comprising the same.
Background
Biomass energy refers to energy produced by various organisms photosynthesis that utilizes carbon dioxide in the air and water in the soil to convert absorbed solar energy into carbohydrates and oxygen. Biomass generally includes several types of agricultural waste, wood and forest industrial waste, livestock manure, municipal domestic waste, and energy crops. The biomass energy has the following characteristics: belongs to renewable energy sources, and can ensure the sustainable utilization of the energy sources; the variety is multiple and the distribution is wide, so that the device is convenient to use on site and has various utilization forms; the related technology is mature, and the storability is good; the energy is saved and the environmental protection effect is good. Biomass gasification is a thermochemical reaction that converts the combustible portion of biomass fuel into combustible gas (mainly hydrogen, carbon monoxide and methane) at high temperature using oxygen or oxygenates in the air as gasifying agent. In the 70 s of the 20 th century, ghaly et al, for the first time proposed the application of gasification technology to fuels of low energy density, such as biomass (GahlyM, piskorzJ, et al, the Hydro gasification of wood [ J ]. IndEngCheMres,1988, 27:256-264). It is worth mentioning that the volatile content of biomass is generally 76% -86%, and a large amount of volatile substances can be separated out at a relatively low temperature after the biomass is heated (Li Chuantong, new energy and renewable energy technology [ M ], southeast university Press, 2005).
The gasifier is the main equipment for biomass gasification reaction. According to the operation mode of the gasification furnace, the gasification furnace is mainly divided into three types of fixed bed, fluidized bed and rotating bed. The gasification furnaces adopted in the domestic biomass gasification process at present are mainly a fixed bed gasification furnace and a fluidized bed gasification furnace. There are a number of different forms of fixed bed gasifiers and fluidized bed gasifiers.
With further intensive research on comprehensive and efficient utilization of biomass, researchers have proposed biomass staged gasification technology in the prior art. For example, chinese patent CN101144022a discloses a three-stage biomass gasifier, which is divided into pyrolysis, gasification stage on grate and gasification stage under grate; however, in this technical scheme, lack of biomass drying section to lead to the pyrolysis process insufficient, volatile separation is incomplete, and gasification section temperature is insufficient, and the heat is insufficient, technical problems such as whole gasification efficiency decline. The inventor finds through analysis that, due to higher water content in biomass, the water content in pyrolysis gas generated by the pyrolysis section is too high, so that the temperature in the gasification section is reduced, the gasification strength and the gasification efficiency are reduced, and the tar content in gasification gas is higher, thus not only increasing the burden of a downstream purification system, causing secondary pollution, but also reducing the energy conversion rate.
Disclosure of Invention
The technical scheme provided by the invention aims to solve the technical problems in the prior art, and the inventor intends to design and manufacture a system capable of fully drying moisture first and then carrying out pyrolysis, so that the moisture content in biomass can be effectively reduced, thereby obviously improving the temperature of a gasification section, enhancing the gasification strength and reducing the tar content in gasification gas.
Accordingly, a first aspect of the present invention provides a dry pyrolysis system for a biomass gasifier comprising a dry section structure, a pyrolysis section structure, and a gas lock detachably connecting the dry section structure and the pyrolysis section structure; the drying section structure is arranged horizontally or obliquely, and the pyrolysis section structure and the horizontal surface form an acute angle alpha in an inclined manner;
the drying section structure comprises a drying section jacket outer cylinder and a drying section auger which are concentrically welded, wherein the drying section jacket outer cylinder is sleeved on the drying section auger, and the length of the drying section jacket outer cylinder is smaller than that of the drying Duan Jiaolong; a heat exchange plate is welded between the outer jacket cylinder of the drying section and the auger of the drying section, and a heating gas inlet of the drying section and a heating gas outlet of the drying section are arranged on the surface of the outer jacket cylinder of the drying section; the drying section auger comprises a drying section feed inlet and a drying section discharge outlet;
the pyrolysis section structure comprises a pyrolysis section jacket outer cylinder and a pyrolysis section auger which are concentrically welded, wherein the pyrolysis section jacket outer cylinder is sleeved on the pyrolysis section auger, and the length of the pyrolysis section jacket outer cylinder is smaller than that of pyrolysis Duan Jiaolong; a heat exchange plate is welded between the pyrolysis section jacket outer cylinder and the pyrolysis section auger, and a pyrolysis section heating gas inlet and a pyrolysis section heating gas outlet are formed in the surface of the pyrolysis section jacket outer cylinder; the pyrolysis section auger comprises a pyrolysis section feed inlet and a pyrolysis section discharge outlet;
and one end of the air lock is connected with the discharge port of the drying section, and the other end of the air lock is connected with the feed port of the pyrolysis section; and a water vapor outlet is welded on one side of the drying section auger opposite to the drying section discharge port.
It is worth to say that when the dry pyrolysis system is operated, biomass from a storage bin enters the drying section auger from the drying section feed inlet, is fully dried under the pushing of the drying section auger, is output from the drying section discharge outlet, enters the pyrolysis section feed inlet through the gas lock, and after being fully pyrolyzed, generated pyrolysis gas and biomass coke enter the biomass gasification furnace from the pyrolysis section discharge outlet so as to implement further treatment; the heating gas is derived from gas subjected to heat exchange by the high-temperature gasification gas generated by the biomass gasification furnace, is respectively introduced into a drying section heating gas inlet and a pyrolysis section heating gas inlet, is guided by each heat exchange plate, respectively heats a drying section auger and a pyrolysis section auger, and is finally output from a drying section heating gas outlet and a pyrolysis section heating gas outlet. In particular, as the water vapor outlet is welded on the auger of the drying section, a large amount of water vapor generated in the drying section can be discharged from the water vapor outlet, so that the content of water in biomass is sufficiently reduced before pyrolysis.
Preferably, in the above drying pyrolysis system, two ends of the air lock are connected with the drying section auger and the pyrolysis section auger through flanges respectively.
Preferably, in the above dry pyrolysis system, the material of the drying section auger and/or the pyrolysis section auger is cast iron or stainless steel.
Preferably, in the dry pyrolysis system described above, the acute angle α=5° to 10 °. Therefore, the pyrolysis section structure which is arranged at an angle of 5-10 degrees with the horizontal plane is convenient for smooth material conveying.
Preferably, in the dry pyrolysis system, the drying section heating gas inlet and the drying section heating gas outlet are both opened at the lower side of the drying section jacket outer cylinder.
Preferably, in the drying pyrolysis system, the pyrolysis section heating gas inlet and the pyrolysis section heating gas outlet are both arranged on the lower side of the pyrolysis section jacket outer cylinder.
In addition, a screw conveyer rotating speed adjusting device can be arranged in the drying and pyrolysis system to timely adjust the rotating speeds of the screw conveyer at the drying section and the screw conveyer at the pyrolysis section; meanwhile, a heating gas flow regulating valve can be arranged in front of the heating gas inlet of the drying section and the heating gas inlet of the pyrolysis section respectively so as to properly regulate the flow of the heating gas; more preferably, the auger rotating speed adjusting device and the heating gas flow adjusting valve can be arranged at the same time and used for more accurately controlling biomass with different moisture contents, so that a better biomass drying pyrolysis effect is obtained.
The second aspect of the invention also provides a biomass gasification system, which comprises a biomass classification gasification furnace and the dry pyrolysis system according to the first aspect of the invention; wherein, the discharge hole of the pyrolysis section stretches into the upper part of the furnace body of the biomass classification gasification furnace.
Preferably, in the biomass gasification system, an insulating layer is arranged on the outer layer of the biomass classification gasification furnace, and a steel grate is arranged in the furnace body and divides the furnace body into an upper gasification section and a lower gasification section; a cylindrical throat is arranged at the inlet of the furnace body, and the cross section area of the throat is smaller than that of the furnace body; and the cylinder body of the throat is uniformly provided with an air inlet pipe so as to be communicated with the outside of the furnace.
Further preferably, in the biomass gasification system, the cross-sectional area of the throat is 0.55 to 0.65 times the cross-sectional area of the furnace body.
Further preferably, in the biomass gasification system, the air intake pipe is disposed obliquely.
In addition, under the condition that the cylindrical throat is arranged, the pyrolysis section structure which is obliquely arranged at an acute angle alpha with the horizontal plane is beneficial to strengthening the high-temperature heat radiation effect of the throat section on the pyrolysis section, so that the pyrolysis temperature is increased, and the pyrolysis reaction is strengthened.
In summary, compared with the prior art, the technical scheme provided by the invention mainly has the following technical advantages: the drying pyrolysis system fully considers the drying characteristic and the pyrolysis characteristic of biomass, can effectively reduce the moisture content in pyrolysis gas introduced into the gasification furnace, improves the gasification temperature, and avoids heat loss in the gasification process; the drying pyrolysis system adopts the air lock to effectively prevent water vapor generated in the drying process from flowing into the pyrolysis section structure, and simultaneously can ensure that the pyrolysis section structure maintains a micro negative pressure state, thereby enhancing the natural circulation heat exchange effect of air in the pyrolysis section structure; in addition, the inclined arrangement of the pyrolysis section structure ensures the smoothness of material conveying on one hand, and can strengthen the high-temperature heat radiation effect of the throat section on the pyrolysis section on the other hand, thereby improving the pyrolysis temperature and strengthening the pyrolysis reaction.
Therefore, the arrangement and the use of the dry pyrolysis system and the biomass gasification system are beneficial to the comprehensive and efficient utilization of biomass, the reduction of the energy consumption of enterprises and the environmental protection; in a word, the dry pyrolysis system and the biomass gasification system provided by the invention have excellent scientific research value and market value.
Drawings
FIG. 1 is a schematic diagram of a dry pyrolysis system for a biomass gasifier according to one embodiment of the invention; wherein: the biomass gasification furnace comprises a 1-drying section heating gas outlet, a 2-drying section jacket outer cylinder, a 3-drying section auger, a 4-drying section heating gas inlet, a 5-gas lock, a 6-pyrolysis section heating gas outlet, a 7-pyrolysis section jacket outer cylinder, an 8-pyrolysis section auger, a 9-pyrolysis section heating gas inlet, a 10-biomass gasification furnace/biomass classification gasification furnace and an 11-water vapor outlet.
Detailed Description
The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to the following embodiments.
As shown in fig. 1, a drying and pyrolysis system for a biomass gasifier comprises a drying section structure, a pyrolysis section structure and a gas lock 5 detachably connecting the drying section structure and the pyrolysis section structure, wherein the drying section structure is horizontally arranged, and the pyrolysis section structure and the horizontal surface are obliquely arranged at an acute angle of 5 degrees;
the drying section structure comprises a drying section jacket outer cylinder 2 and a drying section auger 3 which are concentrically welded, wherein the drying section jacket outer cylinder 2 is sleeved on the drying section auger 3, and the length of the drying section jacket outer cylinder 2 is smaller than that of the drying section auger 3; wherein, a heat exchange plate (not shown in the figure) is welded between the drying section jacket outer cylinder 2 and the drying section auger 3, and the surface of the drying section jacket outer cylinder 2 is provided with a drying section heating gas inlet 4 and a drying section heating gas outlet 1; the drying section auger 3 comprises a drying section feed inlet and a drying section discharge outlet;
the pyrolysis section structure comprises a pyrolysis section jacket outer cylinder 7 and a pyrolysis section auger 8 which are concentrically welded, wherein the pyrolysis section jacket outer cylinder 7 is sleeved on the pyrolysis section auger 8, and the length of the pyrolysis section jacket outer cylinder 7 is smaller than that of the pyrolysis section auger 8; heat exchange plates (not shown in the figure) are welded between the pyrolysis section jacket outer cylinder 7 and the pyrolysis section auger 8, and a pyrolysis section heating gas inlet 9 and a pyrolysis section heating gas outlet 6 are formed in the surface of the pyrolysis section jacket outer cylinder 7; the pyrolysis section auger 8 comprises a pyrolysis section feed inlet and a pyrolysis section discharge outlet;
and one end of the air lock 5 is connected with the discharge port of the drying section, and the other end of the air lock is connected with the feed port of the pyrolysis section; on the side of the drying section auger 3 opposite to the drying section discharge port, a water vapor outlet 11 is welded.
In addition, it should be noted that, in the drying pyrolysis system, the specific diameters and lengths of the drying section auger 3 and the pyrolysis section auger 8 are determined according to the feeding amount and the processing amount, respectively, and the specific diameters of the drying section jacket outer cylinder 2 and the pyrolysis section jacket outer cylinder 7 are also determined according to the specific requirements of the drying strength and the pyrolysis strength. And, the said steam outlet 11 keeps unblocked all the time, is used for discharging the steam produced in the dry course of bionass in real time.
In a preferred embodiment, two ends of the air lock 5 are respectively connected with the drying section auger 3 and the pyrolysis section auger 8 through flanges. In addition, the capacity of the lockers 5 is configured according to the maximum biomass throughput of the dry pyrolysis system.
In a preferred embodiment, the materials of the drying section auger 3 and the pyrolysis section auger 8 are stainless steel.
In a preferred embodiment, the drying section heating gas inlet 4 and the drying section heating gas outlet 1 are both arranged on the lower side of the drying section jacket outer cylinder 2.
In a preferred embodiment, the pyrolysis section heating gas inlet 9 and the pyrolysis section heating gas outlet 6 are both arranged on the lower side of the pyrolysis section jacket outer cylinder 7.
In a further preferred embodiment, the drying section heating gas inlet 4, the drying section heating gas outlet 1 are arranged counter-currently to the drying section feed opening, the drying section discharge opening, i.e. the drying section heating gas outlet 1 is arranged at an end near the drying section feed opening, and the drying section heating gas inlet 4 is arranged at an end near the drying section discharge opening.
In a further preferred embodiment, the pyrolysis section heating gas inlet 9, the pyrolysis section heating gas outlet 6 and the pyrolysis section feed inlet, the pyrolysis section discharge outlet are arranged counter-currently, i.e. the pyrolysis section heating gas outlet 6 is arranged at an end close to the pyrolysis section feed inlet, whereas the pyrolysis section heating gas inlet 9 is arranged at an end close to the pyrolysis section discharge outlet.
The "counter-current arrangement" in the preferred embodiment above facilitates more adequate heat exchange between the heated gas and the material.
In a further preferred embodiment, an auger rotation speed adjusting device is further arranged in the drying pyrolysis system, and can respectively adjust the rotation speeds of the drying section auger 3 and the pyrolysis section auger 8.
In a further preferred embodiment, a heating gas flow regulating valve is arranged before the drying section heating gas inlet 4 and the pyrolysis section heating gas inlet 9, respectively, for regulating the flow of heating gas.
A biomass gasification system comprising a biomass staged gasifier 10 and a dry pyrolysis system according to the first aspect of the invention; wherein, the discharge hole of the pyrolysis section stretches into the upper part of the furnace body of the biomass classification gasification furnace.
In a preferred embodiment, the outer layer of the biomass classifying gasification furnace is provided with a heat preservation layer, and a steel grate is arranged in the furnace body and divides the furnace body into an upper gasification section and a lower gasification section; a cylindrical throat is arranged at the inlet of the furnace body, and the cross section area of the throat is smaller than that of the furnace body; and the cylinder body of the throat is uniformly provided with an air inlet pipe so as to be communicated with the outside of the furnace.
In a further preferred embodiment, the throat has a cross-sectional area of 0.55 to 0.65 times the cross-sectional area of the furnace body.
In a further preferred embodiment, the air inlet pipe is arranged obliquely.
Example 1
The inventor selects three rice straw raw material samples with different water contents (13.45%, 16.6% and 21.4%) for thermogravimetric analysis, which shows that: the weight loss rates of the three rice straw raw material samples with different water contents before 150 ℃ are 5.0%, 10.5% and 19.0%, respectively, which shows that the larger the water content is, the larger the weight loss is, and the larger the heat consumed in the stage is; when the temperature is higher than 230 ℃, the maximum weight loss peak of the three rice straw raw material samples with different water contents is 330 ℃,355 ℃ and 360 ℃ respectively, which shows that the maximum weight loss peak is obviously delayed along with the increase of the water content, and the occurrence of biomass pyrolysis reaction is delayed due to the existence of intrinsic water; analysis of the pyrolysis products shows that as the moisture content increases, the semicoke yield is smaller; therefore, the higher the moisture content, the more energy is required in the drying stage of the rice straw, the thermal cracking reaction of the rice straw is delayed, and the smaller the semicoke yield is.
The inventors performed a biomass gasification experiment on a rice straw raw material sample having a moisture content of 16% using a biomass gasification system including a dry pyrolysis system as shown in fig. 1. In the treatment process, the rice straw raw material firstly enters the drying section auger from the feed bin and is dried for a certain time under the pushing of the auger to ensure that the moisture in the rice straw raw material is sufficiently removed, so as to obtain the dried rice straw raw material; because of the existence of the air lock, the vapor generated in the drying process can be discharged only through the vapor outlet, and the dried rice straw raw material is conveyed into the pyrolysis section auger through the air lock; after full pyrolysis, CO and CO are generated 2 、CH 4 Pyrolysis gas and biomass coke mainly including tar and the like, along withAnd then enters the biomass gasification furnace from a discharge hole of the pyrolysis section to implement further treatment and reaction. Experiments show that after full drying and pyrolysis, the average combustion temperature of the throat section is increased to 1000 ℃, the highest temperature reaches 1100 ℃, and the effect is excellent.
Therefore, the drying pyrolysis system provided by the invention effectively solves the problem of insufficient temperature of a partial oxidation section and insufficient heat supply in the biomass gasification process, and successfully provides and decomposes one-step heat into multiple steps, so that the temperature of the partial oxidation section in the gasification section is increased, the pyrolysis effect is obviously improved, and the precipitation of volatile matters is obviously improved.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (10)
1. The drying and pyrolysis system for the biomass gasification furnace is characterized by comprising a drying section structure, a pyrolysis section structure and a gas lock which is detachably connected with the drying section structure and the pyrolysis section structure; the drying section structure is arranged horizontally or obliquely, and the pyrolysis section structure and the horizontal surface form an acute angle alpha in an inclined manner;
the drying section structure comprises a drying section jacket outer cylinder and a drying section auger which are concentrically welded, wherein the drying section jacket outer cylinder is sleeved on the drying section auger, and the length of the drying section jacket outer cylinder is smaller than that of the drying Duan Jiaolong; a heat exchange plate is welded between the outer jacket cylinder of the drying section and the auger of the drying section, and a heating gas inlet of the drying section and a heating gas outlet of the drying section are arranged on the surface of the outer jacket cylinder of the drying section; the drying section auger comprises a drying section feed inlet and a drying section discharge outlet;
the pyrolysis section structure comprises a pyrolysis section jacket outer cylinder and a pyrolysis section auger which are concentrically welded, wherein the pyrolysis section jacket outer cylinder is sleeved on the pyrolysis section auger, and the length of the pyrolysis section jacket outer cylinder is smaller than that of pyrolysis Duan Jiaolong; a heat exchange plate is welded between the pyrolysis section jacket outer cylinder and the pyrolysis section auger, and a pyrolysis section heating gas inlet and a pyrolysis section heating gas outlet are formed in the surface of the pyrolysis section jacket outer cylinder; the pyrolysis section auger comprises a pyrolysis section feed inlet and a pyrolysis section discharge outlet;
and one end of the air lock is connected with the discharge port of the drying section, and the other end of the air lock is connected with the feed port of the pyrolysis section; and a water vapor outlet is welded on one side of the drying section auger opposite to the drying section discharge port.
2. The dry pyrolysis system of claim 1, wherein two ends of the air lock are connected to the drying section auger and the pyrolysis section auger by flanges, respectively.
3. The dry pyrolysis system of claim 1 wherein the material of the dry section auger and/or the pyrolysis section auger is cast iron or stainless steel.
4. The dry pyrolysis system of claim 1 wherein the acute angle α = 5 ° to 10 °.
5. The dry pyrolysis system of claim 1, wherein the drying section heating gas inlet and the drying section heating gas outlet are both open at the underside of the drying section jacket outer barrel.
6. The dry pyrolysis system of claim 1, wherein the pyrolysis section heating gas inlet and the pyrolysis section heating gas outlet are both open at the underside of the pyrolysis section jacket outer barrel.
7. A biomass gasification system, characterized by comprising a biomass staged gasifier and a dry pyrolysis system according to any one of claims 1 to 6; wherein, the discharge hole of the pyrolysis section stretches into the upper part of the furnace body of the biomass classification gasification furnace.
8. The biomass gasification system according to claim 7, wherein an insulation layer is arranged on the outer layer of the biomass classification gasification furnace, and a steel grate is arranged in the furnace body and divides the furnace body into an upper gasification section and a lower gasification section; a cylindrical throat is arranged at the inlet of the furnace body, and the cross section area of the throat is smaller than that of the furnace body; and the cylinder body of the throat is uniformly provided with an air inlet pipe so as to be communicated with the outside of the furnace.
9. The biomass gasification system according to claim 8, wherein said throat has a cross-sectional area that is between 0.55 and 0.65 times the cross-sectional area of the furnace body.
10. The biomass gasification system according to claim 8, wherein said air inlet conduit is disposed at an incline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245870.9A CN108728166B (en) | 2017-04-14 | 2017-04-14 | Dry pyrolysis system for biomass gasification furnace and biomass gasification system |
Applications Claiming Priority (1)
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