CN109847657B - Fused salt heat supply fluidized bed pyrolysis reaction furnace and reaction method - Google Patents
Fused salt heat supply fluidized bed pyrolysis reaction furnace and reaction method Download PDFInfo
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Abstract
The invention discloses a fused salt heat supply fluidized bed pyrolysis furnace, which comprises a feeder, a fluidized bed pyrolysis furnace, a cyclone separator, a primary bio-oil condensation box and a secondary bio-oil condensation box which are connected in sequence, wherein the feeder consists of a two-stage hopper and a spiral feeder which are arranged along the height direction of the pyrolysis furnace and is used for providing materials; the fluidized bed pyrolysis furnace consists of a carbon dioxide air inlet, a vertical hearth of the cracking furnace and a horizontal hearth of the cracking furnace, and a fused salt heat exchange conduit is arranged in the fluidized bed pyrolysis furnace for realizing the cracking of materials; the cyclone separator is used for separating solid-gas products to obtain pyrolytic carbon, and the two-stage bio-oil condensation box is used for condensing bio-oil with different boiling points in a grading manner; the uncondensed gas is input into a carbon dioxide air inlet to realize recycling; the heat released by the condensation of the bio-oil is used for drying the raw material, so that the utilization of waste heat is realized. The device of the invention accurately controls the temperature in the furnace by using the fused salt, can realize the high-efficiency separation of products, and has the characteristics of simple structure and convenient operation.
Description
Technical Field
The invention belongs to the field of biomass pyrolysis, and particularly relates to a molten salt heat supply fluidized bed pyrolysis reaction furnace and a reaction method.
Background
The reaction mass particles present inside the fluidized bed reactor are in a fluidized state in which they exhibit fluid characteristics. When the speed of the fluid passing through the bed layer is increased to a certain value, the material particles are loosened, the distance between the particles is increased, and the volume of the bed layer begins to expand.
The conventional fluidized bed heat source usually comes from an electric furnace or high-temperature flue gas for heat exchange, and the economical efficiency of electric heat exchange is poor in industrial application, the specific heat capacity of the flue gas is small, the temperature reduction amplitude is large after heat exchange, and the heat supply of the reaction furnace cannot be stably and uniformly realized.
Prior art patent CN107723017A discloses a fluidized bed pyrolysis furnace, including the furnace chamber, the inside heat exchange tube that is provided with the high temperature flue gas in the furnace chamber and passes through, the furnace chamber is provided with outside honeycomb duct, outside honeycomb duct is linked together with the inside heat exchange tube of number, the furnace chamber bottom is provided with the air inlet of input inert gas to the furnace chamber.
The cracking furnace is supplied with heat by high-temperature flue gas, the specific heat capacity is low, the uniformity of the temperature in the furnace is poor, and the accurate control of the temperature in the furnace chamber of the fluidized bed cannot be realized; meanwhile, only one-stage feeding is arranged, so that the feeding pressure is high, and the distribution in the material furnace is uneven; in addition, the flow field design is unreasonable, the retention time in the material furnace is short, the thermal cracking is insufficient, and a novel thermal cracking reaction furnace for heating medium needs to be developed.
Disclosure of Invention
Aiming at least one of the defects or improvement requirements in the prior art, the invention provides a fused salt heat supply fluidized bed pyrolysis reaction furnace, which is provided with two stages of feeding ports to realize uniform feeding, realizes full cracking of materials by arranging vertical and horizontal two stages of cracking reaction zones, realizes enrichment of different liquid products by fractional condensation, and realizes accurate control of the temperature in the furnace preferably by cross-flow arrangement and temperature difference setting of fused salt heat exchange conduits.
To achieve the above object, according to one aspect of the present invention, there is provided a molten salt-heated fluidized-bed pyrolysis reactor, characterized in that: comprises a feeder device, a fluidized bed pyrolysis furnace, a cyclone separator, a primary bio-oil condensation tank and a secondary bio-oil condensation tank which are connected in sequence;
wherein the feeder device comprises a primary screw feeder and a secondary screw feeder which are sequentially arranged from bottom to top along the height direction of the fluidized bed pyrolysis furnace;
the fluidized bed pyrolysis furnace comprises a carbon dioxide air inlet at the bottom, a vertical hearth of the cracking furnace and a horizontal hearth of the cracking furnace which are connected in sequence; the device comprises a cracking furnace vertical hearth, a cracking furnace horizontal hearth, a cracking furnace heat exchange medium inlet pipe, a cracking furnace heat exchange medium outlet pipe and a cracking furnace heat exchange medium outlet pipe, wherein a primary molten salt heat exchange conduit and a secondary molten salt heat exchange conduit are respectively arranged on the cracking furnace vertical hearth and the cracking furnace horizontal hearth and are used for allowing molten salt heat exchange media with uniform temperature to;
the cyclone separator is positioned at the tail part of the horizontal hearth of the cracking furnace, and the lower part of the cyclone separator is provided with a coke collecting box;
the primary bio-oil condensing tank is connected with the cyclone separator, and a primary bio-oil collecting box is arranged at the bottom of the primary bio-oil condensing tank and used for collecting high-boiling-point bio-oil; the secondary bio-oil condensing tank is connected with the primary bio-oil condensing tank, and a secondary bio-oil collecting box is arranged at the bottom of the secondary bio-oil condensing tank and used for collecting low-boiling-point bio-oil;
and a pyrolysis gas outlet of the secondary bio-oil condensing box discharges uncondensed pyrolysis gas into the carbon dioxide air inlet through partial branches to enter the fluidized bed pyrolysis furnace, so that the pyrolysis gas is recycled.
Preferably, the primary screw feeder is used for providing 50% -70% of biomass materials, the secondary screw feeder is used for providing the rest 30% -50% of biomass materials, and the biomass materials are respectively fed into the lower part and the upper part of the vertical hearth of the cracking furnace by the corresponding primary screw feeder and the corresponding secondary screw feeder.
Preferably, the feeder device further comprises a primary hopper, a secondary hopper, a primary heating box and a secondary heating box;
the feed inlets of the primary screw feeder and the secondary screw feeder are respectively connected with the primary hopper and the secondary hopper, and the primary heating box and the secondary heating box are respectively sleeved outside the primary screw feeder and the secondary screw feeder;
high-temperature heat conduction oil which is subjected to heat exchange through the two-stage biological oil condensing box is introduced into the first-stage heating box and the second-stage heating box so as to dry the materials.
Preferably, a plurality of the primary molten salt heat exchange conduits and the secondary molten salt heat exchange conduits are respectively and uniformly arranged in the vertical hearth and the horizontal hearth of the cracking furnace;
the fused salt in the heat exchange conduit absorbs heat from an external heat source and enters the respective heat exchange conduits from the corresponding fused salt heat exchange conduit inlets so as to realize material heating, and the fused salt after heat exchange is discharged from the corresponding fused salt heat exchange conduit outlets and flows to the external heat source again to absorb heat, thereby realizing a cycle process.
Preferably, a plurality of the primary molten salt heat exchange conduits are respectively provided with a common primary hot molten salt inlet and a common primary hot molten salt outlet at both ends; two ends of the secondary molten salt heat exchange conduits are respectively provided with a common secondary hot molten salt inlet and a common secondary hot molten salt outlet;
the molten salt enters the corresponding molten salt heat exchange conduit from the first-stage hot-melt salt inlet and the second-stage hot-melt salt inlet respectively, flows out from the first-stage hot-melt salt outlet and the second-stage hot-melt salt outlet after sufficient heat exchange, returns to an external heat source for heating, and recycles the heated molten salt to the first-stage hot-melt salt inlet and the second-stage hot-melt salt inlet.
Preferably, the temperature of the primary molten salt heat exchange conduit is higher than the temperature of the secondary molten salt heat exchange conduit by% -%.
Preferably, the primary molten salt heat exchange conduit and the secondary molten salt heat exchange conduit are arranged in a manner of crossing the flow direction of biomass material particles in the vertical hearth and the horizontal hearth of the cracking furnace.
Preferably, a smoke-folding corner is arranged at the upper part of the other side, opposite to the feeder device, of the vertical hearth of the cracking furnace, and is used for enhancing airflow disturbance at the top of the furnace chamber and enhancing heat exchange.
Preferably, a volatile component guide plate is arranged at the top of one side of the feeder device and the vertical hearth of the cracking furnace and used for changing the flow direction of volatile components, optimizing the flow field in the furnace chamber, reducing the height of the pyrolysis furnace and saving the capital construction cost.
In order to achieve the above object, according to another aspect of the present invention, there is provided a reaction method of the molten salt heat supply fluidized bed pyrolysis reactor, comprising the steps of:
relatively more materials are fed into a cracking furnace vertical hearth of the fluidized bed pyrolysis furnace by a primary screw feeder, and the rest materials are fed by a secondary screw feeder;
the materials are preheated in the two-stage screw feeder by absorbing the heat of high-temperature heat conducting oil from the two-stage bio-oil condensing box;
the preheated materials are fully contacted with a first-stage molten salt heat exchange conduit positioned in a vertical hearth of the cracking furnace and a second-stage molten salt heat exchange conduit positioned in a horizontal hearth of the cracking furnace under the driving of carbon dioxide fluidized air entering from a carbon dioxide air inlet, so that the pyrolysis process is realized;
the pyrolysis finished product enters a cyclone separator for cyclone separation, and the separated solid product is cooled to form a final coke product which is collected in a coke collecting box; the gas product is fully condensed through a subsequent primary bio-oil condensing box and a subsequent secondary bio-oil condensing box, and high-boiling bio-oil and low-boiling bio-oil are respectively obtained in a primary bio-oil collecting box and a secondary bio-oil collecting box; and introducing the uncondensed gas into the carbon dioxide air inlet again to be used as fluidized air.
The above-described preferred features may be combined with each other as long as they do not conflict with each other.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
1. the molten salt heat supply fluidized bed pyrolysis reaction furnace is sequentially connected with a primary feeding hole, a secondary feeding hole, a vertical hearth of the cracking furnace, a primary molten salt heat conduction pipe, a horizontal hearth of the cracking furnace, a secondary molten salt heat conduction pipe, a cyclone separator, a coke collecting box, a primary bio-oil condensation box, a secondary bio-oil condensation box and a pyrolysis gas outlet from left to right.
2. The molten salt heat supply fluidized bed pyrolysis reaction furnace adopts two-stage feeding, reduces the feeding pressure of a first-stage feeding port, reduces the temperature disturbance caused by the entrance of cold biomass materials at the bottom of the cracking furnace, and realizes the uniform feeding in the fluidized bed furnace and the accurate control of the temperature in the fluidized bed furnace.
3. The molten salt heat supply fluidized bed pyrolysis reaction furnace adopts two-stage heat exchange of molten salt, the specific heat of the molten salt is large, the heat transfer efficiency is high, stable work in the range of 400-1200 ℃ can be realized through regulation and control of the component proportion, and the working temperature adaptability is strong; in addition, the two-stage molten salt heat exchange design fully considers the temperature disturbance of cold biomass materials and carbon dioxide fluidized air to the interior of the hearth, and the temperature of the first-stage molten salt heat exchange conduit is 5% -10% higher than that of the second-stage molten salt heat exchange conduit, so that the accurate control of the temperature in the whole cracking furnace is realized.
4. The molten salt heat supply fluidized bed pyrolysis reaction furnace adopts fractional condensation, is beneficial to the separation of bio-oil components in different condensation sections, and achieves the purpose of enriching different liquid products.
Drawings
FIG. 1 is a schematic structural view of a molten salt-heated fluidized-bed pyrolysis reactor of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a sectional view B-B of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.
As a preferred embodiment of the present invention, as shown in FIG. 1, the present invention provides a molten salt heat supply fluidized bed pyrolysis reactor, which comprises a feeder device 1, a fluidized bed pyrolysis furnace 20, a cyclone 13, a primary bio-oil condensation tank 14 and a secondary bio-oil condensation tank 16 connected in sequence. Wherein the feeder device 1 comprises a first-stage screw feeder 3 and a second-stage screw feeder 6 which are sequentially arranged from bottom to top along the height direction of the fluidized bed pyrolysis furnace 20 and are used for feeding materials into a hearth of the fluidized bed pyrolysis furnace. The fluidized bed pyrolysis furnace 20 comprises a carbon dioxide air inlet 21 at the bottom, a vertical hearth 9 of the cracking furnace and a horizontal hearth 11 of the cracking furnace which are connected in sequence and used for providing a reaction space for thermal cracking of materials; the cracking furnace comprises a cracking furnace vertical hearth 9 and a cracking furnace horizontal hearth 11, wherein a primary molten salt heat exchange conduit 10 and a secondary molten salt heat exchange conduit 12 are respectively arranged on the cracking furnace vertical hearth and the cracking furnace horizontal hearth and used for flowing in molten salt heat exchange media with uniform temperature to realize thermal cracking of materials carried by carbon dioxide fluidized wind. The cyclone separator 13 is positioned at the tail part of the horizontal hearth 11 of the cracking furnace, and the lower part of the cyclone separator is provided with a coke collecting box 18 for collecting coke. The primary bio-oil condensation tank 14 is connected with the cyclone separator 13, and a primary bio-oil collection tank 15 for collecting high-boiling-point bio-oil is arranged at the bottom of the primary bio-oil condensation tank; the secondary bio-oil condensing tank 16 is connected with the primary bio-oil condensing tank 14, and a secondary bio-oil collecting tank 17 is arranged at the bottom of the secondary bio-oil condensing tank and used for collecting low-boiling-point bio-oil; and a pyrolysis gas outlet of the secondary bio-oil condensing box 16 discharges uncondensed pyrolysis gas into the carbon dioxide air inlet 21 through partial branches and enters the fluidized bed pyrolysis furnace 20, so that the pyrolysis gas is recycled.
Preferably, the primary screw feeder 3 is used for providing 50% -70% of biomass material, and the secondary screw feeder 6 is used for providing the rest 30% -50% of biomass material, and the biomass material is respectively fed into the lower part and the upper part of the vertical hearth 9 of the cracking furnace by the corresponding primary screw feeder 3 and the corresponding secondary screw feeder 6. And a carbon dioxide air inlet 21 is formed in the lower part of the vertical hearth 9 of the pyrolysis furnace and used for providing fluidized air for the hearth so as to carry materials entering the spiral feeder and enable the materials to be in contact with the molten salt heat exchange conduit from bottom to top. The upper portion of the right side of the vertical hearth 9 of the cracking furnace is provided with a smoke-folding angle 19, the smoke-folding angle 19 can change the flow direction of smoke, the disturbance and the entrainment of the smoke at the upper portion are enhanced, the heat exchange is enhanced, and the heat exchange efficiency is improved. The top of the left side of the vertical hearth 9 of the cracking furnace is provided with a volatile guide plate 8, the volatile guide plate 8 can enable flue gas to turn, optimize the flow field in the furnace chamber, reduce the height of the cracking furnace and save the capital construction cost.
Preferably, the feeder device 1 further comprises a primary hopper 4, a secondary hopper 7, a primary heating box 2, and a secondary heating box 5. The feed inlets of the primary screw feeder 3 and the secondary screw feeder 6 are respectively connected with the primary hopper 4 and the secondary hopper 7, and the primary heating box 2 and the secondary heating box 5 are respectively sleeved outside the primary screw feeder 3 and the secondary screw feeder 6; high-temperature heat conduction oil which is subjected to heat exchange through the two-stage biological oil condensing boxes 14 and 16 is introduced into the first-stage heating box 2 and the second-stage heating box 5, so that drying of materials is achieved.
Preferably, a plurality of the primary molten salt heat exchange conduits 10 and the secondary molten salt heat exchange conduits 12 are respectively and uniformly arranged in the vertical hearth 9 and the horizontal hearth 11 of the cracking furnace, and are used for fully contacting with the materials and providing heat required by preheating the materials and partially cracking the materials to complete cracking. The fused salt in the heat exchange conduit absorbs heat from an external heat source and enters the respective heat exchange conduits from the corresponding fused salt heat exchange conduit inlets so as to realize material heating, and the fused salt after heat exchange is discharged from the corresponding fused salt heat exchange conduit outlets and flows to the external heat source again to absorb heat, thereby realizing a cycle process.
As shown in fig. 3, a single primary hot molten salt inlet 22 and a single primary hot molten salt outlet 23 which are common to both ends of the primary molten salt heat exchange conduits 10 are provided; a secondary hot molten salt inlet 24 and a secondary hot molten salt outlet 25 which are common to both ends of the plurality of secondary molten salt heat exchange conduits 12 are provided, respectively. The molten salt enters the corresponding molten salt heat exchange conduit from the first-stage hot molten salt inlet 22 and the second-stage hot molten salt inlet 24 respectively, flows out from the first-stage hot molten salt outlet 23 and the second-stage hot molten salt outlet 25 after sufficient heat exchange, returns to an external heat source for heating, and the heated molten salt is recycled to the first-stage hot molten salt inlet 24 and the second-stage hot molten salt inlet 25. The one-level molten salt heat exchange conduit and the second-level molten salt heat exchange conduit are arranged inside the cracking furnace, so that the heat exchange area is far larger than the traditional outer wall heating mode, the stability of the temperature field inside the cracking furnace is favorably realized, and the cracking reaction temperature can be accurately controlled. Preferably, the temperature of the primary molten salt heat exchange conduit 10 is 5% -10% higher than the temperature of the secondary molten salt heat exchange conduit 12. Preferably, the primary molten salt heat exchange conduit 10 and the secondary molten salt heat exchange conduit 12 are arranged in a way of crossing with the flowing direction of biomass material particles in the vertical hearth 9 and the horizontal hearth 11 of the cracking furnace, so that the disturbance of particles in the fluidized bed can be strengthened, and the heat exchange efficiency is greatly increased.
Furthermore, the product collection and purification comprises coke separation and collection, biological oil fraction condensation and biomass pyrolysis gas recycling. Wherein the coke separating and collecting device comprises a cyclone separator 13 positioned at the tail part of a horizontal hearth 11 of the cracking furnace and a coke collecting box 18 at the lower part thereof. The biomass pyrolysis volatile matter after gas-solid separation enters a primary bio-oil condensing tank 14 positioned behind the cyclone separator 13 for collecting high-boiling-point bio-oil, and then enters a secondary bio-oil condensing tank 16 for collecting low-boiling-point bio-oil; the biological oil condensing box adopts heat conduction oil as a heat exchange medium, and the heat-exchanged high-temperature heat conduction oil flows into a heating box coated outside the spiral feeder to realize heating of materials and utilization of waste heat; the uncondensed pyrolysis gas is discharged from the secondary bio-oil condensing box 16 and enters the fluidized bed pyrolysis furnace 20 through the carbon dioxide gas inlet 21, so that the reutilization of the pyrolysis gas is realized.
The molten salt heat supply fluidized bed pyrolysis reaction furnace has the specific working process that:
50-70% of the material is fed into a cracking furnace vertical hearth 9 of the fluidized bed pyrolysis furnace 20 by a primary screw feeder 3, and the rest material is fed by a secondary screw feeder 6; the materials are preheated in the two-stage screw feeder by absorbing the heat of high-temperature heat conducting oil from the two-stage bio-oil condensing box; the preheated materials are driven by carbon dioxide fluidized air entering from a carbon dioxide air inlet 21 to fully contact with a primary molten salt heat exchange conduit 10 positioned in a vertical hearth 20 of the cracking furnace and a secondary molten salt heat exchange conduit 12 positioned in a horizontal hearth 11 of the cracking furnace, so that the pyrolysis process is realized; the products after pyrolysis enter a cyclone separator 13 for cyclone separation, and the separated solid products are cooled to form final coke products which are collected in a coke collecting box 18; the gas product is fully condensed through a subsequent primary bio-oil condensing box 14 and a secondary bio-oil condensing box 15 in sequence, and high-boiling bio-oil and low-boiling bio-oil are respectively obtained in the primary bio-oil collecting box 15 and the secondary bio-oil collecting box 17; the uncondensed gas is fed into the carbon dioxide inlet 21 again as fluidizing air. The heating boxes of the condensing box and the spiral feeder all use heat conduction oil as heat exchange media, the heat conduction oil preheats the raw materials entering the furnace through absorbing the waste heat of the pyrolysis gas, and the heat conduction oil discharged by the preheated raw materials can be used as cooling media for cooling pyrolysis gas products again so as to improve the heat efficiency of the pyrolysis furnace.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A fused salt heat supply fluidized bed pyrolysis reaction furnace is characterized in that: comprises a feeder device, a fluidized bed pyrolysis furnace, a cyclone separator, a primary bio-oil condensation tank and a secondary bio-oil condensation tank which are connected in sequence;
wherein the feeder device comprises a primary screw feeder and a secondary screw feeder which are sequentially arranged from bottom to top along the height direction of the fluidized bed pyrolysis furnace;
the fluidized bed pyrolysis furnace comprises a carbon dioxide air inlet at the bottom, a vertical hearth of the cracking furnace and a horizontal hearth of the cracking furnace which are connected in sequence; the device comprises a cracking furnace vertical hearth, a cracking furnace horizontal hearth, a cracking furnace heat exchange medium inlet pipe, a cracking furnace heat exchange medium outlet pipe and a cracking furnace heat exchange medium outlet pipe, wherein a primary molten salt heat exchange conduit and a secondary molten salt heat exchange conduit are respectively arranged on the cracking furnace vertical hearth and the cracking furnace horizontal hearth and are used for allowing molten salt heat exchange media with uniform temperature to;
the cyclone separator is positioned at the tail part of the horizontal hearth of the cracking furnace, and the lower part of the cyclone separator is provided with a coke collecting box;
the primary bio-oil condensing tank is connected with the cyclone separator, and a primary bio-oil collecting box is arranged at the bottom of the primary bio-oil condensing tank and used for collecting high-boiling-point bio-oil; the secondary bio-oil condensing tank is connected with the primary bio-oil condensing tank, and a secondary bio-oil collecting box is arranged at the bottom of the secondary bio-oil condensing tank and used for collecting low-boiling-point bio-oil;
and a pyrolysis gas outlet of the secondary bio-oil condensing box discharges uncondensed pyrolysis gas into the carbon dioxide air inlet through partial branches to enter the fluidized bed pyrolysis furnace, so that the pyrolysis gas is recycled.
2. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
the primary screw feeder is used for providing 50% -70% of biomass materials, the secondary screw feeder (6) is used for providing the rest 30% -50% of biomass materials, and the biomass materials are respectively fed into the lower portion and the upper portion of the vertical hearth (9) of the cracking furnace through the corresponding primary screw feeder (3) and the corresponding secondary screw feeder (6).
3. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 2, wherein:
the feeder device also comprises a primary hopper, a secondary hopper, a primary heating box and a secondary heating box;
the feed inlets of the primary screw feeder and the secondary screw feeder are respectively connected with the primary hopper and the secondary hopper, and the primary heating box and the secondary heating box are respectively sleeved outside the primary screw feeder and the secondary screw feeder;
high-temperature heat conduction oil which is subjected to heat exchange through the two-stage biological oil condensing box is introduced into the first-stage heating box and the second-stage heating box so as to dry the materials.
4. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
the primary molten salt heat exchange conduits and the secondary molten salt heat exchange conduits are respectively and uniformly arranged in the vertical hearth and the horizontal hearth of the cracking furnace;
the fused salt in the heat exchange conduit absorbs heat from an external heat source and enters the respective heat exchange conduits from the corresponding fused salt heat exchange conduit inlets so as to realize material heating, and the fused salt after heat exchange is discharged from the corresponding fused salt heat exchange conduit outlets and flows to the external heat source again to absorb heat, thereby realizing a cycle process.
5. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 4, wherein:
two ends of the primary molten salt heat exchange conduits are respectively provided with a primary hot molten salt inlet and a primary hot molten salt outlet which are shared; two ends of the secondary molten salt heat exchange conduits are respectively provided with a common secondary hot molten salt inlet and a common secondary hot molten salt outlet;
the molten salt enters the corresponding molten salt heat exchange conduit from the first-stage hot-melt salt inlet and the second-stage hot-melt salt inlet respectively, flows out from the first-stage hot-melt salt outlet and the second-stage hot-melt salt outlet after sufficient heat exchange, returns to an external heat source for heating, and recycles the heated molten salt to the first-stage hot-melt salt inlet and the second-stage hot-melt salt inlet.
6. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
the temperature of the first-stage molten salt heat exchange conduit is 5% -10% higher than that of the second-stage molten salt heat exchange conduit.
7. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
the primary molten salt heat exchange conduit and the secondary molten salt heat exchange conduit are arranged in a way of crossing with the flowing directions of biomass material particles in the vertical hearth and the horizontal hearth of the cracking furnace.
8. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
and a smoke-folding corner is arranged on the upper part of the other side of the vertical hearth of the cracking furnace, which is opposite to the feeder device, and is used for enhancing airflow disturbance at the top of the furnace chamber and enhancing heat exchange.
9. The molten salt-heated fluidized-bed pyrolysis reactor according to claim 1, wherein:
the top of the vertical hearth of the cracking furnace and one side of the feeder device is provided with a volatile component guide plate, and the volatile component guide plate is used for changing the flow direction of volatile components, optimizing the flow field in the furnace chamber, reducing the height of the pyrolysis furnace and saving the capital construction cost.
10. A reaction method of the molten salt-heated fluidized-bed pyrolysis reactor according to any one of claims 1 to 9, characterized in that:
relatively more materials are fed into a cracking furnace vertical hearth of the fluidized bed pyrolysis furnace by a primary screw feeder, and the rest materials are fed by a secondary screw feeder;
the materials are preheated in the two-stage screw feeder by absorbing the heat of high-temperature heat conducting oil from the two-stage bio-oil condensing box;
the preheated materials are fully contacted with a first-stage molten salt heat exchange conduit positioned in a vertical hearth of the cracking furnace and a second-stage molten salt heat exchange conduit positioned in a horizontal hearth of the cracking furnace under the driving of carbon dioxide fluidized air entering from a carbon dioxide air inlet, so that the pyrolysis process is realized;
the pyrolysis finished product enters a cyclone separator for cyclone separation, and the separated solid product is cooled to form a final coke product which is collected in a coke collecting box; the gas product is fully condensed through a subsequent primary bio-oil condensing box and a subsequent secondary bio-oil condensing box, and high-boiling bio-oil and low-boiling bio-oil are respectively obtained in a primary bio-oil collecting box and a secondary bio-oil collecting box; and introducing the uncondensed gas into the carbon dioxide air inlet again to be used as fluidized air.
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| CN101544901B (en) * | 2009-05-05 | 2012-05-23 | 江苏大学 | Method and device for preparing biological oil by biomass cracking |
| CN102031133B (en) * | 2010-12-30 | 2013-09-25 | 东北林业大学 | Device and method for producing biological fuel oil by quickly cracking biomass |
| JP2014079705A (en) * | 2012-10-17 | 2014-05-08 | Sumitomo Chemical Co Ltd | Multitubular type reaction apparatus |
| CN103031139B (en) * | 2012-10-22 | 2014-10-08 | 华北电力大学 | Device and method for preparing bio-oil through rapid biomass pyrolysis |
| US9714391B2 (en) * | 2014-08-14 | 2017-07-25 | Johnny D. Combs | Waste to fuel system |
| CN105400528B (en) * | 2014-09-16 | 2019-01-29 | 王开辉 | A kind of rice husk rapid pyrolysis apparatus and corollary system |
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| DK201670548A1 (en) * | 2016-07-21 | 2018-02-19 | Syntes One Eng Group Aps | Pyrolysis system and process |
| CN106966360B (en) * | 2017-03-31 | 2019-03-01 | 中国科学院广州能源研究所 | The method of preparing hydrogen gas through catalytic cracking of methane and the device of this method is realized in a kind of fuse salt |
| CN107723017A (en) * | 2017-11-29 | 2018-02-23 | 广州市新望谷环保科技有限公司 | One kind fluidisation pyrolysis oven |
| CN109207179A (en) * | 2018-09-18 | 2019-01-15 | 华中科技大学 | A kind of system of Photospot solar fuse salt pyrolysis carbonaceous material preparing synthetic gas |
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2019
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