CN107245345B - Pyrolysis reaction system and pyrolysis reaction method - Google Patents

Pyrolysis reaction system and pyrolysis reaction method Download PDF

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Publication number
CN107245345B
CN107245345B CN201710497315.5A CN201710497315A CN107245345B CN 107245345 B CN107245345 B CN 107245345B CN 201710497315 A CN201710497315 A CN 201710497315A CN 107245345 B CN107245345 B CN 107245345B
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pyrolysis
furnace body
outlet
hydrogen
mixing
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CN107245345A (en
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石晓莉
陈水渺
赵延兵
姜朝兴
肖磊
耿层层
孙宝林
吴道洪
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Beijing Hengfeng Yaye Technology Development Co ltd
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Beijing Hengfeng Yaye Technology Development Co ltd
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/04Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/04Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The invention discloses a pyrolysis reaction system and a pyrolysis reaction method, wherein the pyrolysis reaction system is provided with a first feed inlet and a second feed inlet, and comprises the following components: the pyrolysis furnace body is provided with a first feeding hole; the heating pipe stretches into the pyrolysis furnace body; the mixing component comprises a mixing furnace body and a mixer, the mixing furnace body is arranged below the pyrolysis furnace body and is communicated with the pyrolysis furnace body, the second feeding port is arranged on the pyrolysis furnace body or the mixing furnace body, a pyrolysis gas outlet is arranged on the pyrolysis furnace body and/or the mixing furnace body, and a hydrogen inlet is arranged on the pyrolysis furnace body and/or the mixing furnace body; the device comprises a dust removing device, an oil-gas separating device and a purifying device which are sequentially connected in series, wherein a dust removing inlet is communicated with a pyrolysis gas outlet; the hydrogen extracting device comprises a hydrogen extracting inlet, a first hydrogen extracting outlet and a second hydrogen extracting outlet, wherein the hydrogen extracting inlet is communicated with the purifying outlet, and the first hydrogen extracting outlet is communicated with the hydrogen inlet. According to the pyrolysis reaction system provided by the invention, the quality of pyrolysis gas can be improved.

Description

Pyrolysis reaction system and pyrolysis reaction method
Technical Field
The invention relates to the technical field of pyrolysis reaction, in particular to a pyrolysis reaction system and a pyrolysis reaction method of the pyrolysis reaction system.
Background
Pyrolysis oil gas and semicoke are obtained after the lignite is subjected to fast pyrolysis reaction, and in the related technology, the yield of hydrogen and hydrocarbon in pyrolysis gas obtained after the lignite is subjected to pyrolysis reaction in a pyrolysis reaction system is low, and the quality of the pyrolysis gas is not high.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a pyrolysis reaction system, which is provided with a hydrogen extracting device to ensure that the yields of hydrogen and hydrocarbon in pyrolysis gas obtained after the pyrolysis reaction of materials are high, so that the quality of the pyrolysis gas can be improved.
The invention also provides a pyrolysis reaction method of the pyrolysis reaction system.
According to an embodiment of the present invention, a pyrolysis reaction system having a first feed inlet and a second feed inlet, the pyrolysis reaction system comprising: the pyrolysis furnace body is provided with a first feeding hole; the heating pipe stretches into the pyrolysis furnace body to provide pyrolysis heat for materials in the pyrolysis furnace body; the mixing component comprises a mixing furnace body and a mixer, the mixing furnace body is arranged below the pyrolysis furnace body and is communicated with the pyrolysis furnace body to receive pyrolyzed materials discharged from the pyrolysis furnace body, the mixing furnace body is provided with a discharge hole, the second feed hole is arranged on the pyrolysis furnace body or the mixing furnace body and is positioned between the heating pipe and the mixer, the mixer is used for mixing materials discharged into the mixing furnace body from the pyrolysis furnace body and the second feed hole, the pyrolysis furnace body and/or the mixing furnace body are/is provided with a pyrolysis gas outlet, and the pyrolysis furnace body and/or the mixing furnace body are/is provided with a hydrogen inlet; the dust removing device comprises a dust removing inlet, a first dust removing outlet and a second dust removing outlet, and the dust removing inlet is communicated with the pyrolysis gas outlet; the oil-gas separation device comprises an oil-gas separation inlet, a first oil-gas separation outlet and a second oil-gas separation outlet, and the oil-gas separation inlet is communicated with the first dust removal outlet; the purification device comprises a purification inlet and a purification outlet, and the purification inlet is communicated with the first oil-gas separation outlet; the hydrogen extracting device comprises a hydrogen extracting inlet, a first hydrogen extracting outlet and a second hydrogen extracting outlet, wherein the hydrogen extracting inlet is communicated with the purifying outlet, and the first hydrogen extracting outlet is communicated with the hydrogen inlet.
According to the pyrolysis reaction system provided by the embodiment of the invention, the pyrolysis gas discharged from the pyrolysis gas outlet is subjected to dust removal, oil-gas separation and purification by the dust removal device, the oil-gas separation device and the purification device to obtain pure pyrolysis gas, hydrogen in the pyrolysis gas is extracted by the hydrogen extraction device for extracting hydrogen, and the extracted hydrogen is introduced into the pyrolysis furnace body and/or the mixing furnace body again, so that the yield of hydrogen and hydrocarbon in the pyrolysis reaction of materials can be greatly improved, and the quality of the pyrolysis gas is improved.
In addition, the pyrolysis reaction system according to the embodiment of the invention can also have the following additional technical features:
according to some embodiments of the invention, the mixer comprises a plurality of baffles provided on an inner peripheral wall of the mixing furnace, free ends of each of the baffles extending obliquely downward in a direction toward a central axis of the mixing furnace, free ends of at least two of the baffles extending toward each other and being offset in a vertical direction.
Optionally, two groups of baffle groups are arranged in the mixing furnace body, each baffle group comprises at least two baffles which are arranged at intervals in the vertical direction, the free ends of the baffles of the two groups of baffle groups extend towards each other, and the free ends of the baffles of the two groups of baffle groups are arranged in a staggered manner in the vertical direction.
Optionally, the ratio of the dislocation distance of the two baffles and the length of the baffles, which are arranged in a dislocation manner at the free end, is in the range of 1/10-1/5.
Optionally, the included angle between each baffle and the side wall of the mixing furnace body ranges from 30 degrees to 75 degrees.
According to some embodiments of the invention, a length ratio between the pyrolysis furnace and the mixing furnace is 2:3-5:4.
Optionally, the pyrolysis reaction system further comprises a vibration device connected with each baffle plate to drive each baffle plate to vibrate.
In one embodiment of the present invention, the dust removing device includes a primary dust removing device and a secondary dust removing device connected in series with each other.
Optionally, the primary dust removing device and the secondary dust removing device are cyclone separators.
According to the pyrolysis reaction method of the pyrolysis reaction system according to the embodiment of the present invention, the pyrolysis reaction system is the pyrolysis reaction system according to the above embodiment of the present invention, the pyrolysis reaction method includes the following steps:
s1: the material is conveyed into the pyrolysis furnace body through the first feed inlet, the heating pipe is controlled to work so as to provide pyrolysis heat for the material in the pyrolysis furnace body, and pyrolysis gas discharged from the pyrolysis gas outlet is sequentially received through the dust removing device, the oil-gas separating device and the purifying device;
s2: after a preset time, conveying the materials into the mixing furnace body through the second feeding hole, controlling the mixer to work so as to mix the materials discharged into the mixing furnace body from the pyrolysis furnace body and the second feeding hole, and sequentially receiving pyrolysis gas discharged from the pyrolysis gas outlet through the dust removing device, the oil-gas separating device and the purifying device;
s3: receiving pure pyrolysis gas discharged from the purification device through the hydrogen extraction device, and extracting hydrogen in the pyrolysis gas;
s4: and reintroducing the hydrogen extracted by the hydrogen extracting device into the pyrolysis furnace body and/or the mixing furnace body through the hydrogen inlet.
According to the pyrolysis reaction method of the pyrolysis reaction system, disclosed by the embodiment of the invention, the pyrolysis gas discharged from the pyrolysis gas outlet is subjected to dust removal, oil-gas separation and purification by using the dust removal device, the oil-gas separation device and the purification device to obtain pure pyrolysis gas, hydrogen in the pure pyrolysis gas is extracted by using the hydrogen extraction device, and the extracted hydrogen is introduced into the pyrolysis furnace body and/or the mixing furnace body again, so that the yield of hydrogen and hydrocarbon in the pyrolysis reaction of materials can be greatly improved, and the quality of the pyrolysis gas is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a pyrolysis reaction system according to an embodiment of the present invention;
fig. 2 is a schematic view of a part of the pyrolysis reaction system shown in fig. 1.
Reference numerals:
a pyrolysis reaction system 100;
a pyrolysis furnace body 1; a first feed port 11; a second feed port 12; a discharge port 13; a pyrolysis gas outlet 14; a hydrogen inlet 15;
a heating pipe 2; a gas inlet 21; an air inlet 22; a flue gas outlet 23;
a mixing part 3; a mixing furnace body 31; a mixer 32; a baffle group 321; a baffle 3211;
a hydrogen extracting device 4; a hydrogen extraction inlet 41; a first hydrogen extraction outlet 42; a second hydrogen extraction outlet 43;
a dust removing device 5; a primary dust removing device 51; a secondary dust removing device 52;
an oil-gas separation device 6; a purifying device 7; a driving device 8; a hopper 9;
a dryer 200; a screw conveyor 300; a screw feeder 400; a semicoke collection tank 500; an oil storage tank 600; a gas storage tank 700.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
A pyrolysis reaction system 100 according to embodiments of the present invention is described below with reference to fig. 1-2. The pyrolysis reaction system 100 may be used for the rapid pyrolysis of materials such as lignite.
As shown in fig. 1 to 2, a pyrolysis reaction system 100 according to an embodiment of the present invention has a first feed inlet 11 and a second feed inlet 12, the pyrolysis reaction system 100 comprising: the device comprises a pyrolysis furnace body 1, a heating pipe 2, a mixing component 3, a hydrogen extracting device 4 for extracting hydrogen, a dust removing device 5, an oil-gas separating device 6 and a purifying device 7.
Specifically, the first feed port 11 is provided on the pyrolysis furnace body 1, and the heating pipe 2 extends into the pyrolysis furnace body 1 to supply pyrolysis heat to the material in the pyrolysis furnace body 1. Therefore, after the material enters the pyrolysis furnace body 1 through the first feed inlet 11, the heating pipe 2 in the pyrolysis furnace body 1 provides heat for the material so that the material is fully pyrolyzed in the pyrolysis furnace body 1, and oil gas and high-temperature semicoke are formed after the material is pyrolyzed.
The mixing part 3 comprises a mixing furnace 31 and a mixer 32, the mixing furnace 31 is arranged below the pyrolysis furnace 1 and is communicated with the pyrolysis furnace 1 to receive pyrolyzed materials discharged from the pyrolysis furnace 1 (here, the materials are high-temperature semicoke generated by pyrolysis in the pyrolysis furnace 1), the mixing furnace 31 is provided with a discharge port 13, the second feed port 12 is arranged on the pyrolysis furnace 1 or the mixing furnace 31 and is positioned between the heating pipe 2 and the mixer 32, the mixer 32 is used for mixing materials discharged from the pyrolysis furnace 1 and the second feed port 12 into the mixing furnace 31, namely, the mixer 32 mixes pyrolyzed semicoke products discharged from the pyrolysis furnace 1 with new materials discharged from the second feed port 12, so that the high-temperature semicoke discharged from the pyrolysis furnace 1 into the mixing furnace 31 releases sensible heat of the semicoke products, the materials discharged from the second feed port 12 into the mixing furnace 31 absorb heat of the semicoke products and carry out pyrolysis, and the semicoke products formed after releasing the sensible heat of the semicoke fall into the discharge port 13 on the mixing furnace 31 and are discharged from the discharge port 13 of the pyrolysis system 100. Therefore, the sensible heat of the high-temperature semicoke product generated after the pyrolysis of the material in the pyrolysis furnace body 1 is fully utilized, so that the energy consumption of the system is effectively reduced, and the yield of pyrolysis tar is improved.
The pyrolysis furnace body 1 and/or the mixing furnace body 31 are provided with the pyrolysis gas outlet 14, namely the pyrolysis gas outlet 14 can be only arranged on the pyrolysis furnace body 1 or the mixing furnace body 31, or the pyrolysis furnace body 1 and the mixing furnace body 31 are provided with the pyrolysis gas outlet 14, the pyrolysis furnace body 1 and/or the mixing furnace body 31 are provided with the hydrogen inlet 15, namely the hydrogen inlet 15 can be only arranged on the pyrolysis furnace body 1 or the mixing furnace body 31, or the pyrolysis furnace body 1 and the mixing furnace body 31 are provided with the hydrogen inlet 15, and because the pyrolysis furnace body 1 and the mixing furnace body 31 are communicated with each other, when the pyrolysis gas outlet 14 and the hydrogen inlet 15 are respectively arranged on any one of the pyrolysis furnace body 1 and the mixing furnace body 31, pyrolysis gas generated by pyrolysis in the pyrolysis furnace body 1 and the mixing furnace body 31 can be discharged through the pyrolysis gas outlet 14, and hydrogen can be diffused into the pyrolysis furnace body 1 and the mixing furnace body 31 after entering through the hydrogen inlet 15.
The dust removing device 5 comprises a dust removing inlet, a first dust removing outlet and a second dust removing outlet, the dust removing inlet is communicated with the pyrolysis gas outlet 14, pyrolysis gas generated by pyrolysis of materials in the pyrolysis furnace body 1 and the mixing furnace body 31 is discharged out of the pyrolysis furnace body 1 and the mixing furnace body 31 through the pyrolysis gas outlet 14 and enters the dust removing device 5 through the dust removing inlet, pyrolysis gas discharged by the pyrolysis gas outlet 14 is subjected to dust removal in the dust removing device 5 to separate semicoke products mixed in the pyrolysis gas, the separated semicoke pyrolysis gas is discharged out of the dust removing device 5 through the first dust removing outlet, and the separated semicoke is discharged out of the dust removing device 5 through the second dust removing outlet, optionally, as shown in fig. 1, the second dust removing outlet can be connected with a semicoke collecting tank 500 so as to collect the semicoke products separated by the dust removing device 5 for subsequent process treatment.
The oil-gas separation device 6 comprises an oil-gas separation inlet, a first oil-gas separation outlet and a second oil-gas separation outlet, wherein the oil-gas separation inlet is communicated with the first dust removal outlet, pyrolysis gas discharged from the first dust removal outlet enters the oil-gas separation device 6 through the oil-gas separation inlet to be subjected to oil-gas separation so as to separate oil liquid mixed in the pyrolysis gas, the pyrolysis gas after the oil liquid is separated out of the oil-gas separation device 6 through the first oil-gas separation outlet, the separated oil liquid is discharged out of the oil-gas separation device 6 through the second oil-gas separation outlet, and optionally, as shown in fig. 1, the second oil-gas separation outlet can be connected with the oil storage tank 600 so as to store the separated oil liquid in the oil storage tank 600 for subsequent process treatment.
The purification device 7 comprises a purification inlet and a purification outlet, wherein the purification inlet is communicated with the first oil-gas separation outlet, pyrolysis gas discharged from the first oil-gas separation outlet enters the purification device 7 through the purification inlet for purification treatment so as to remove impurities and harmful gases in the pyrolysis gas, so that pure pyrolysis gas is obtained, and the pure pyrolysis gas is discharged out of the purification device through the purification outlet.
The hydrogen extracting device 4 for extracting hydrogen, the hydrogen extracting device 4 comprises a hydrogen extracting inlet 41, a first hydrogen extracting outlet 42 and a second hydrogen extracting outlet 43, the hydrogen extracting inlet 41 is communicated with the purifying outlet, and the first hydrogen extracting outlet 42 is connected with the hydrogen inlet 15. The pure pyrolysis gas discharged from the purifying outlet enters the hydrogen extracting device 4 through the hydrogen extracting inlet 41, and the hydrogen extracted by the hydrogen extracting device 4 is discharged from the hydrogen extracting device 4 through the first hydrogen extracting outlet 42 and enters the pyrolysis furnace body 1 and the mixing furnace body 31 through the hydrogen inlet 15 communicated with the first hydrogen extracting outlet 42. The residual gas after hydrogen extraction is discharged from the hydrogen extraction device 4 through the second hydrogen extraction outlet 43, alternatively, the second hydrogen extraction outlet 43 may be connected to the gas storage tank 700 to collect pyrolysis gas remaining after hydrogen extraction in the gas storage tank 700 to be treated by a subsequent process.
According to the pyrolysis reaction system 100 of the embodiment of the invention, the pyrolysis gas discharged from the pyrolysis gas outlet 14 is dedusted, separated and purified by the dedusting device 5, the oil-gas separation device 6 and the purification device 7 to obtain pure pyrolysis gas, the hydrogen in the pyrolysis gas is extracted by the hydrogen extracting device 4 for extracting hydrogen, and the extracted hydrogen is introduced into the pyrolysis furnace body 1 and/or the mixing furnace body 31 again, so that the yield of hydrogen and hydrocarbon in the pyrolysis reaction of materials can be greatly improved, and the quality of the pyrolysis gas is improved.
Alternatively, the pyrolysis gas outlets 14 may be plural, and the plural pyrolysis gas outlets 14 may be spaced apart on the side walls of the pyrolysis furnace body 1 and the mixing furnace body 31. Thereby improving the efficiency of pyrolysis gas discharge. Preferably, a plurality of pyrolysis gas outlets 14 circumscribe a pyrolysis gas duct (not shown) that directs pyrolysis gas to the same pyrolysis gas overall outlet (not shown). So that the pyrolysis reaction system 100 is simple in structure and high in working efficiency.
Preferably, as shown in fig. 1, the dust-removing device 5 may include a multi-stage dust-removing device 5, for example, as shown in fig. 1, a primary dust-removing device 51 and a secondary dust-removing device 52 are disposed between the pyrolysis gas outlet 14 and the hydrogen extraction inlet 41 in series, specifically, the primary dust-removing device 51 and the secondary dust-removing device 52 each include a dust-removing inlet, a first dust-removing outlet and a second dust-removing outlet, the dust-removing inlet of the primary dust-removing device 51 is communicated with the pyrolysis gas outlet 14, the first dust-removing outlet of the primary dust-removing device 51 is communicated with the dust-removing inlet of the secondary dust-removing device 52, the first dust-removing outlet of the secondary dust-removing device 52 is communicated with the oil-gas separation inlet of the oil-gas separation device 6, and the second dust-removing outlets of the primary dust-removing device 51 and the secondary dust-removing device 52 are both connected with the semicoke collection tank 500, whereby the pyrolysis gas discharged from the pyrolysis gas outlet 14 first enters the primary dust-removing device 51 to remove semicoke mixed in the pyrolysis gas, the gas after the dust-removing in the primary dust-removing device 51 then enters the secondary pyrolysis device 52 to further remove dust, the obtained clean gas, and then enters the oil-gas separation device 6 and the oil-gas separation device 7 to perform the separation treatment, and the oil-gas separation device is further clean, and the hydrogen extraction device 4 is disposed, thereby, and the dust-purifying device is better, and the dust is purified. Alternatively, the primary dust removing device 51 and the secondary dust removing device 52 may be cyclone separators, which has simple structure, low cost and good dust removing effect.
In the example shown in fig. 1, a driving device 8 (such as an induced draft fan) is disposed between the first hydrogen outlet 42 and the hydrogen inlet 15 of the hydrogen extracting device 4, so as to drive hydrogen to flow from the first hydrogen outlet 42 toward the hydrogen inlet 15, ensure that the hydrogen smoothly and quickly enters the pyrolysis furnace body 1 and the mixing furnace body 31, and improve the quality of pyrolysis gas generated by the pyrolysis reaction of materials.
In one embodiment of the invention, as shown in fig. 2, the heating tube 2 is a regenerative radiant tube. So that the heating pipe 2 has high thermal efficiency, stable operation and high reliability. It can be understood that when the heating pipe 2 is a heat accumulating radiant tube, the pyrolysis furnace body 1 is further provided with a gas inlet 21, an air inlet 22 and a flue gas outlet 23, so that the heat efficiency and the reliability in the heat accumulating radiant tube can be ensured, and the heating pipe 2 can be further ensured to provide sufficient heat for the materials in the pyrolysis furnace body 1 to be pyrolyzed. Wherein the temperature of the tube wall of the regenerative radiant tube is controlled by a gas regulating valve (not shown).
In one embodiment of the present invention, as shown in fig. 1 and 2, the mixer 32 includes a plurality of baffles 3211, the plurality of baffles 3211 being provided on an inner peripheral wall of the mixing furnace 31, free ends of each of the baffles 3211 extending obliquely downward in a direction toward a central axis of the mixing furnace 31, free ends of at least two of the baffles 3211 extending toward each other and being disposed offset in a vertical direction. The high-temperature semicoke products generated after pyrolysis of the materials in the pyrolysis furnace body 1 are discharged into the mixing furnace body 31 along the pyrolysis furnace body 1, then the high-temperature semicoke products and the materials entering the mixing furnace body 31 from the second feeding port 12 are received by a plurality of baffles 3211 on the mixing furnace body 31 and move downwards along the baffles 3211, the high-temperature semicoke products and the materials discharged into the mixing furnace body 31 from the second feeding port 12 are mixed under the action of the inclined baffles 3211 in the moving process, so that the high-temperature semicoke products discharged into the mixing furnace body 31 from the pyrolysis furnace body 1 release self sensible heat, the materials entering the mixing furnace body 31 from the second feeding port 12 absorb the heat released by the materials and carry out pyrolysis, and the semicoke products formed after pyrolysis and the semicoke products released self sensible heat fall into the discharge port 13 on the mixing furnace body 31 and are discharged out of the pyrolysis reaction system 100 from the discharge port 13. The mixer 32 is simple in structure and low in manufacturing cost.
According to some embodiments of the present invention, two groups of baffles 321 are disposed in the mixing furnace 31, each group of baffles 321 includes at least two baffles 3211 disposed at intervals in a vertical direction, free ends of the baffles 3211 of the two groups of baffles 321 extend toward each other, and free ends of the baffles 3211 of the two groups of baffles 321 are disposed in a staggered manner in the vertical direction. Therefore, the structural arrangement of the two baffle groups 321 can ensure the flowing time of the high-temperature semicoke product discharged from the pyrolysis furnace body 1 into the mixing furnace body 31 and the material discharged from the second feeding hole 12 into the mixing furnace body 31 on the two baffle groups 321, so as to enhance the mixing effect of the high-temperature semicoke product and the material, and further facilitate the improvement of the pyrolysis efficiency of the pyrolysis reaction system 100.
Alternatively, the interval between two adjacent baffles 3211 of each group of baffles 321 is 100mm-500mm, for example, the interval between two adjacent baffles 3211 of each group of baffles 321 may be 100mm, 200mm, 250mm or 500mm, etc., so that an effective space is provided for discharging oil gas generated after pyrolysis of the materials in the mixing furnace 31, and thus the pyrolysis efficiency of the pyrolysis reaction system 100 is improved.
Optionally, when the value range of the ratio between the dislocation distance of the two baffles 3211 and the length of the baffles 3211, which are arranged at the dislocation of the free ends, is 1/10-1/5, the high-temperature semicoke products discharged into the mixing furnace body 31 from the pyrolysis furnace body 1 and the materials discharged into the mixing furnace body 31 from the second feeding hole 12 can be fully mixed, so that heat exchange is more sufficient, and the heat recovery efficiency is higher.
In an alternative example of the present invention, the two shutters 3211 having the free ends offset are different in length. Thereby be favorable to discharging from pyrolysis furnace body 1 to mix the high temperature semicoke product in the furnace body 31 and discharging from second feed inlet 12 to mix the material in the furnace body 31 and contact, evenly mix repeatedly on baffle 3211, and then make the material that enters into mixing furnace body 31 from second feed inlet 12 more abundant absorb the self sensible heat that the high temperature semicoke product that discharges into mixing furnace body 31 from pyrolysis furnace body 1 released in order to carry out the pyrolysis, improve the pyrolysis efficiency in mixing furnace body 31.
Further, when the length ratio of the two baffles 3211 with the staggered free ends is 1.2-1.5, the material entering the mixing furnace body 31 from the second feeding port 12 can be ensured to fully absorb the self-sensible heat released by the high-temperature semicoke products discharged from the pyrolysis furnace body 1 into the mixing furnace body 31, so that the yield of pyrolysis tar in the pyrolysis reaction system 100 is ensured.
Optionally, the included angle between each baffle 3211 and the side wall of the mixing furnace 31 ranges from 30 ° to 75 °, that is, the included angle between each baffle 3211 and the side wall of the mixing furnace 31 is greater than or equal to 30 ° and less than or equal to 75 °, for example, may be 30 °, 40 °, 45 °, 50 °, 55 °, 60 ° or 75 °, etc., and preferably, the included angle between each baffle 3211 and the side wall of the mixing furnace 31 is 60 °, so that the high-temperature semicoke product discharged from the pyrolysis furnace 1 on each baffle 3211 and the moving speed of the material discharged from the second feed inlet 12 into the mixing furnace 31 to the discharge outlet 13 can be controlled to a certain extent, so that the material in the mixing furnace 31 is pyrolyzed more sufficiently, and the pyrolysis reaction efficiency is improved. Preferably, the length ratio between the pyrolysis furnace body 1 and the mixing furnace body 31 is 2:3-5:4, thereby ensuring that the pyrolysis reaction of the pyrolysis furnace body 1 and the mixing furnace body 31 is more sufficient.
The heat insulation material piece can be arranged on the inner wall of the mixing furnace body 31, the heat insulation material piece can be a rock wool piece, namely, the heat insulation material piece can be made of rock wool materials, but is not limited to the rock wool, and the heat insulation material piece is arranged on the inner wall of the mixing furnace body 31, so that heat of high-temperature semicoke products discharged into the mixing furnace body 31 from the pyrolysis furnace body 1 is prevented from being dissipated outwards from the inner peripheral wall of the mixing furnace body 31, the heat insulation effect of the mixing furnace body 31 is improved, and the pyrolysis efficiency of materials in the mixing furnace body 31 can be improved to a certain extent. The baffle plate 3211 may be a stainless steel plate, so that high temperature resistance and corrosion resistance of the baffle plate 3211 can be ensured, and reliability of the pyrolysis reaction system 100 can be improved.
In one embodiment of the present invention, the pyrolysis reaction system 100 further comprises a vibration device (not shown) coupled to each of the baffles 3211 to drive each of the baffles 3211 to vibrate. Accordingly, it can be seen that each baffle plate 3211 can vibrate at a high frequency under the driving of the vibration device, so that the high-temperature semicoke product discharged from the pyrolysis furnace body 1 into the mixing furnace body 31 on each baffle plate 3211 and the material discharged from the second feeding port 12 into the mixing furnace body 31 can be mixed more uniformly under the vibration action of the baffle plate 3211, thereby improving the yield of pyrolysis tar in the pyrolysis reaction system 100. Meanwhile, the baffle plate 3211 vibrating at high frequency can also effectively prevent semicoke products and materials in the mixing furnace body 31 from accumulating on the baffle plate 3211 due to internal friction, electrification, component segregation and other reasons to block the mixing furnace body 31, so that the reliability of the pyrolysis reaction system 100 is improved to a certain extent.
Specifically, the vibration device includes a plurality of vibration bars (not shown) and a motor (not shown), the plurality of vibration bars are respectively connected to the motor, the plurality of vibration bars are disposed in one-to-one correspondence with the plurality of shutters 3211, each shutter 3211 is mounted on a corresponding vibration bar, the vibration device transmits a vibration force to the corresponding shutter 3211 through an axial movement of each vibration bar to drive each shutter 3211 to vibrate, and the vibration device has a simple structure and high movement reliability.
Optionally, the pyrolysis reaction system 100 may further comprise a screw conveyor 300, the screw conveyor 300 being provided at the discharge opening 13. Thus, the carbocoal product at the discharge port 13 can be conveyed to the outside of the pyrolysis reaction system 100, for example, into the carbocoal collection tank 500, and the carbocoal product can be automatically output by arranging the screw conveyor 300, so that the pyrolysis reaction process can be simplified, and the pyrolysis reaction efficiency can be improved.
As shown in fig. 1, the first feed port 11 and the second feed port 12 are respectively provided with a screw feeder 400, and the screw feeder 400 connects the hopper 9 and the first feed port 11 and the second feed port 12, whereby the materials in the hopper 9 can be automatically conveyed into the pyrolysis furnace body 1 and the mixing furnace body 31 through the screw feeder 400, thereby simplifying the pyrolysis reaction process and improving the pyrolysis reaction efficiency. The pyrolysis reaction system 100 further includes a dryer 200 for drying the raw materials, and the materials are stored in the hopper 9 after being dried in the dryer 200, whereby the pyrolysis reaction efficiency can be improved. Alternatively, the dryer 200 may be a riser dryer 200, which has a simple structure, low cost, and good drying efficiency.
The following description is made in connection with specific examples of pyrolysis of lignite. Wherein: table 1 is a coal quality analysis of raw materials of brown coal; table 2 shows the process operating parameters of the fast pyrolysis of the brown coal of wild goose; table 3 is the content of each component in pyrolysis gas obtained by pyrolysis of lignite by using a pyrolysis reaction system (without hydrogen circulation process) in the prior art and a pyrolysis reaction system 100 (with hydrogen circulation process) in one embodiment of the present application, specifically, the pyrolysis reaction system 100 includes the pyrolysis furnace body 1, the heating pipe 2, the mixing component 3, the hydrogen extraction device 4, the dust removal device 5, the oil-gas separation device 6, the purification device 7 and the vibration device 8, the dust removal device 5 includes a primary dust removal device 51 and a secondary dust removal device 52 which are connected in series with each other, and the primary dust removal device 51 and the secondary dust removal device 52 are all cyclone separators, the mixing component 3 includes the mixing furnace body 31 and the mixer 32, the mixer 32 includes a plurality of baffles 3211, and the vibration device is connected with each baffle to drive each baffle to vibrate.
Table 1 brown coal quality analysis of wild goose
Table 2 process operating parameters and material balances
TABLE 3 content of pyrolysis gas main components
From table 3 it can be derived that: compared with the pyrolysis reaction in the pyrolysis reaction system in the prior art, the wild goose brown coal is pyrolyzed in the pyrolysis reaction system 100 of one embodiment of the application to generate H in the pyrolysis gas 2 、CH 4 、C 2 H 4 And C 3 H 6 The yield of (2) is improved by 10%.
According to the pyrolysis reaction method of the pyrolysis reaction system according to the embodiment of the present invention, the pyrolysis reaction system is the pyrolysis reaction system 100 according to the above embodiment of the present invention, the pyrolysis reaction method includes the steps of:
s1: the method comprises the steps that materials are conveyed into a pyrolysis furnace body 1 through a first feed port 11, a heating pipe 2 is controlled to work so as to provide pyrolysis heat for the materials in the pyrolysis furnace body 1, pyrolysis gas discharged from a pyrolysis gas outlet 14 is sequentially received through a dust removal device 5, an oil-gas separation device 6 and a purification device 7, specifically, the materials entering the pyrolysis furnace body 1 through the first feed port 11 are pyrolyzed in the pyrolysis furnace body 1 to generate semicoke and pyrolysis gas, the semicoke is downwards discharged into a mixing furnace body 31, the pyrolysis gas is firstly discharged into the dust removal device 5 through a pyrolysis gas outlet 14 to remove semicoke mixed in the pyrolysis gas, then enters the oil-gas separation device 6 to perform oil-gas separation to remove oil liquid mixed in the pyrolysis gas, and then enters the purification device 7 to perform purification treatment to remove impurities and harmful gases in the pyrolysis gas so as to obtain pure pyrolysis gas;
s2: after a predetermined time, the materials are conveyed into the mixing furnace body 31 through the second feed inlet 12, the mixer 32 is controlled to work so as to mix the materials discharged into the mixing furnace body 31 from the pyrolysis furnace body 1 and the second feed inlet 12, and the pyrolysis gas discharged from the pyrolysis gas outlet 14 is sequentially received through the dust removing device 5, the oil-gas separation device 6 and the purification device 7, the predetermined time can be set according to actual needs, for example, after semicoke generated by pyrolysis in the pyrolysis furnace body 1 enters the mixing furnace body 31, the materials are conveyed into the mixing furnace body 31 through the second feed inlet 12, the materials discharged into the mixing furnace body 31 from the pyrolysis furnace body 1 (the materials refer to semicoke generated by pyrolysis in the pyrolysis furnace body 1) provide pyrolysis heat for the materials discharged into the mixing furnace body 31 from the second feed inlet 12 (the materials required to be pyrolyzed in the process), so that the pyrolysis gas generated by pyrolysis is discharged into the dust removing device 5 from the gas outlet 14 firstly, and then enters the pyrolysis gas mixture 6 for purifying and removing impurities in the pyrolysis furnace body 31, and then the purified oil-gas is discharged into the mixing furnace body 31;
s3: receiving the pure pyrolysis gas discharged from the purifying device 7 through the hydrogen extracting device 4, and extracting hydrogen in the pyrolysis gas;
s4: the hydrogen extracted by the hydrogen extracting device 4 is reintroduced into the pyrolysis furnace 1 and/or the mixing furnace 31 through the hydrogen inlet 15.
According to the pyrolysis reaction method of the pyrolysis reaction system, the pyrolysis gas discharged from the pyrolysis gas outlet 14 is subjected to dust removal, oil-gas separation and purification by the dust removal device 5, the oil-gas separation device 6 and the purification device 7 to obtain pure pyrolysis gas, hydrogen in the pure pyrolysis gas is extracted by the hydrogen extraction device 4, and the extracted hydrogen is introduced into the pyrolysis furnace body 1 and/or the mixed furnace body 31 again, so that the yield of hydrogen and hydrocarbon in the pyrolysis reaction of materials can be greatly improved, and the quality of the pyrolysis gas is improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. A pyrolysis reaction system, wherein the pyrolysis reaction system has a first feed port and a second feed port, the pyrolysis reaction system comprising:
the pyrolysis furnace body is provided with a first feeding hole;
the heating pipe stretches into the pyrolysis furnace body to provide pyrolysis heat for materials in the pyrolysis furnace body;
the mixing component comprises a mixing furnace body and a mixer, the mixing furnace body is arranged below the pyrolysis furnace body and is communicated with the pyrolysis furnace body to receive pyrolyzed materials discharged from the pyrolysis furnace body, the mixing furnace body is provided with a discharge hole, the second feed hole is arranged on the pyrolysis furnace body or the mixing furnace body and is positioned between the heating pipe and the mixer, the mixer is used for mixing materials discharged into the mixing furnace body from the pyrolysis furnace body and the second feed hole, the pyrolysis furnace body and/or the mixing furnace body are/is provided with a pyrolysis gas outlet, and the pyrolysis furnace body and/or the mixing furnace body are/is provided with a hydrogen inlet; the dust removing device comprises a dust removing inlet, a first dust removing outlet and a second dust removing outlet, and the dust removing inlet is communicated with the pyrolysis gas outlet;
the oil-gas separation device comprises an oil-gas separation inlet, a first oil-gas separation outlet and a second oil-gas separation outlet, and the oil-gas separation inlet is communicated with the first dust removal outlet;
the purification device comprises a purification inlet and a purification outlet, and the purification inlet is communicated with the first oil-gas separation outlet;
the hydrogen extracting device comprises a hydrogen extracting inlet, a first hydrogen extracting outlet and a second hydrogen extracting outlet, wherein the hydrogen extracting inlet is communicated with the purifying outlet, and the first hydrogen extracting outlet is communicated with the hydrogen inlet;
the mixer comprises a plurality of baffles, wherein the baffles are arranged on the inner peripheral wall of the mixing furnace body, the free ends of each baffle extend downwards in a tilting manner along the direction towards the central axis of the mixing furnace body, and the free ends of at least two baffles extend towards each other and are staggered in the vertical direction;
wherein the length ratio between the pyrolysis furnace body and the mixing furnace body is 2:3-5:4.
2. The pyrolysis reaction system of claim 1 wherein two sets of baffles are provided in the mixing furnace, each set of baffles comprising at least two baffles spaced apart in a vertical direction, the free ends of the baffles of the two sets of baffles extending toward each other, the free ends of the baffles of the two sets of baffles being staggered in the vertical direction.
3. The pyrolysis reaction system of claim 1 wherein the ratio between the offset distance of the two baffles with offset free ends and the length of the baffles ranges from 1/10 to 1/5.
4. The pyrolysis reaction system of claim 1 wherein the included angle between each baffle and the side wall of the mixing furnace is in the range of 30 ° -75 °.
5. The pyrolysis reaction system of claim 1 further comprising a vibration device coupled to each baffle to drive each baffle to vibrate.
6. The pyrolysis reaction system of any one of claims 1 to 5 wherein the dust removal means comprises primary dust removal means and secondary dust removal means in series with each other.
7. The pyrolysis reaction system of claim 6 wherein the primary dust removal device and the secondary dust removal device are both cyclones.
8. A pyrolysis reaction method of a pyrolysis reaction system, characterized in that the pyrolysis reaction system is a pyrolysis reaction system according to any one of claims 1 to 7, comprising the steps of:
s1: the material is conveyed into the pyrolysis furnace body through the first feed inlet, the heating pipe is controlled to work so as to provide pyrolysis heat for the material in the pyrolysis furnace body, and pyrolysis gas discharged from the pyrolysis gas outlet is sequentially received through the dust removing device, the oil-gas separating device and the purifying device;
s2: after a preset time, conveying the materials into the mixing furnace body through the second feeding hole, controlling the mixer to work so as to mix the materials discharged into the mixing furnace body from the pyrolysis furnace body and the second feeding hole, and sequentially receiving pyrolysis gas discharged from the pyrolysis gas outlet through the dust removing device, the oil-gas separating device and the purifying device;
s3: receiving pure pyrolysis gas discharged from the purification device through the hydrogen extraction device, and extracting hydrogen in the pyrolysis gas;
s4: and reintroducing the hydrogen extracted by the hydrogen extracting device into the pyrolysis furnace body and/or the mixing furnace body.
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