GB2514514A - Coal pyrolysis device and coal pyrolysis method for improving yield of tar - Google Patents
Coal pyrolysis device and coal pyrolysis method for improving yield of tar Download PDFInfo
- Publication number
- GB2514514A GB2514514A GB1416425.5A GB201416425A GB2514514A GB 2514514 A GB2514514 A GB 2514514A GB 201416425 A GB201416425 A GB 201416425A GB 2514514 A GB2514514 A GB 2514514A
- Authority
- GB
- United Kingdom
- Prior art keywords
- furnace
- coal pyrolysis
- tar
- material bed
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B7/00—Coke ovens with mechanical conveying means for the raw material inside the oven
- C10B7/06—Coke ovens with mechanical conveying means for the raw material inside the oven with endless conveying devices
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B1/00—Retorts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/18—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with moving charge
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/02—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Industrial Gases (AREA)
Abstract
A coal pyrolysis device and a coal pyrolysis method for improving yield of tar by reducing secondary pyrolysis of the tar at high temperature. The coal pyrolysis device for improving yield of tar of the present invention comprises a furnace body, the furnace body being formed by a fixed furnace top, a furnace wall (4) and a rotary furnace bottom (2), a material bed (15) used for placing materials (7) being arranged on the rotary furnace bottom (2), an interval between the material bed (15) and the rotary furnace bottom (2) being an overhead space (3), and the material bed (15) being a ventilation material bed; and an air sucking opening (8) being arranged at one side of the overhead space (3) and being connected with a high-temperature fan (9) and an air outlet (10). In the coal pyrolysis device and the coal pyrolysis method for improving yield of tar of the present invention, by changing a furnace body structure in the rotary bed and an air flue, a gas flowing direction in a furnace is adjusted, and circulation of a thermal field inside the furnace and the function of heating a material are reinforced. Pyrolysis gas forcedly permeates a material layer under the action of the high-temperature fan (9), the flowing of gas in the furnace is reinforced, and heat transfer of the material layer is accelerated; and the situation of secondary pyrolysis of the tar resulting from secondary combination of macromolecular free radicals generated by original coal pyrolysis is reduced, so as to improve the yield of the tar through original coal pyrolysis.
Description
Description
Coal Pyrolysis Apparatus for Improving Tar Yield and Pyrolysis Method Thereof
Field of the Invention
The present invention relates to a coal pyrolysis apparatus and a coal pyrolysis method, in particular to a coal pyrolysis apparatus for improving tar yield and a coal pyrolysis method thereof.
Background of the Invention
A rotary hearth furnace for pyrolysis of materials such as coal, hiomass, and urban rubbish is disclosed in Patent Application No.200910238038.1 titled as "Radiant Tube and Circulating Gas Combined Heating Moving Bed Retort Furnace'. As shown in Figure 1, the rotary hearth furnace comprises fixed furnace wall 4, furnace top 6, rotary furnace hearth 2, and elevated layer over furnace hearth 3, wherein, a water sealing, sand sealing, or oil sealing system 1 is arranged between furnace hearth 2 and furnace wall 4 to separate the hearth from the surroundings. The material 7 is laid on a fixed material bed and is driven by the rotary furnace hearth 2 to rotate in the horizontal plane, and is kept still relatively to the material bed, without extrusion or movement; therefore, the heating effect is good. The space between the material bed and the furnace top is used as the hearth, and heating devices such as burners and radiant tubes 5 are mounted in the hearth to heat the material 7. The rotary hearth furnace is equipped with a blower fan 9 and has gas suction port 8 and gas blast port 11, to strengthen the gas flow in the furnace and improve the heat exchange between the gas in the furnace and the material 7. The gas circulation in the retort furnace is forced circulation from bottom to top; therefore, the stay time of retort gas in the furnace is too long, and may result in secondary pyrolysis of tar; as a result, the tar yield is low.
A rotary bed for pyrolysis of materials such as coal, biomass, and urban rubbish is disclosed in Patent Application No. 201110286641.4 titled as "Rotary Bed Retort Furnace and Method for Improving Tar Yield from Dry Distillation of Coal with Activated Pyrolysis Gas". As shown in Figure 2, the rotary hearth furnace comprises fixed furnace wall 4, furnace top 6, and rotary furnace hearth 2, wherein, a water sealing, sand sealing, or oil sealing system 1 is arranged between the furnace hearth 2 and the furnace wall 4, to isolate the hearth from the surroundings. The material 7 is laid on a fixed material bed and is driven by the rotary furnace hearth 2 to rotate in the horizontal plane, and is kept still relatively to the material bed, without extrusion or movement; therefore, the heating effect is good. The space between the material bed and the furnace top 6 is used as the hearth, and radiant tubes 5 are mounted in the hearth to heat the material 7. The rotary hearth furnace is equipped with a blower fan 9, wherein, the gas suction port 8 of the blower fan 9 is in the hearth, while the gas blast port 8 is near the material bed. Catalyst 12, oxidizer module 13, and temperature control module 14 are mounted on the blower fan 9, so that the hot gas sucked into the blower fan 9 reacts with the catalyst and oxidizer and then is returned to the material through the gas blast port II. In that way, the small-molecule gasses (e.g., methane) pyrolyzed from the raw material can be reused to combine with the large-molecule substances in the material to he pyrolyzed, so as to improve the tar yield. However, catalytic oxidation introduces additional cost; since methane emission is reduced because the gasses produced from pyrolysis are reused, the heat value of the gasses collected from the furnace finally is decreased severely.
Summary of the Invention
The present invention provides a coal pyrolysis apparatus for improving tar yield by reducing secondary pyrolysis of tar at high temperature and a coal pyrolysis method thereof.
In one aspect of the present invention, a coal pyrolysis apparatus for improving tar yield is provided, comprising a furnace body, wherein, a material bed for the material to be pyrolyzed is arranged over the furnace hearth of the furnace body, a free space is formed between the material bed and the furnace hearth, and the material bed is a ventilated material bed; a gas suction port is arranged on a side of the free space, and is connected to a heat-resistant blower fan and a gas blast port.
The furnace body comprises furnace wall, furnace top, and rotary furnace hearth, heating radiant tubes are arranged in the furnace body, and a water seal trough for sealing purpose is arranged between the furnace wall and the rotary furnace hearth.
The material bed has densely and evenly distributed pores.
The pores are in diameter of 3-8mm, and are arranged at 6-i 1mm center-to-center spacing between each other.
Preferably, the pores are in 5mm diameter, and the center-to-center spacing between the pores is 8mm.
In another aspect of the present invention, a coal pyrolysis method for improving tar yield is provided: the crushed and screened dry material is loaded onto a ventilated material bed in the hearth of a pyrolysis apparatus; the coal gas produced from dry distillation of the material is sucked by a heat-resistant blower fan to flow out of material bed from the bottom and flow through the material from top to bottom.
The material is in iO-8Omm particle size.
The coal pyrolysis apparatus and method for improving tar yield in the present invention have the following beneficial effects: The coal pyrolysis apparatus and method for improving tar yield in the present invention implement a new rotary hearth furnace for coal pyrolysis, which has improved furnace body and flue structure and can achieve higher tar yield; with the change of furnace body and flue structure in the rotary hearth furnace, the gas flow direction in the furnace is adjusted, and thereby the thermal circulation and material heating effect in the furnace are improved. Since the pyrolysis gas is driven by the blower fan to flow through the material layer, the gas flow in the furnace is strengthened, and therefore the heat transfer to the material layer is improved; secondary combination between large-molecule free radicals produced from coal pyrolysis is reduced, and secondary pyrolysis of tar can be avoided; as a result, the tar yield from coal pyrolysis is improved.
Brief Description of the Drawings
Figure 1 is a schematic structural diagram of an existing coal pyrolysis apparatus in
the prior art;
Figure 2 is a schematic structural diagram of another existing coal pyrolysis
apparatus in the prior art;
Figure 3 is a schematic structural diagram of the coal pyrolysis for improving tar yield in the present invention.
Detailed Description of the Embodiments
As shown in Figure 3, the coal pyrolysis apparatus for improving tar yield provided in the present invention comprises a furnace body, wherein, a material bed 15 for the material 7 to be pyrolyzed is arranged over the furnace hearth 2 of the furnace body, a free space 3 is formed between the material bed 15 and the furnace hearth 2, and the material bed 15 is a ventilated material bed; a gas suction port 8 is arranged on a side of the free space 3, and is connected to a heat-resistant blower fan 9 and a gas blast port 10. The furnace body comprises furnace wall 4, furnace top 6, and rotary furnace hearth 3, heating radiant tubes 5 are arranged in the furnace body, and a water seal trough 1 for sealing purpose is arranged between the furnace wall 4 and the rotary furnace hearth 2.
The material bed 15 has densely and evenly distributed pores. The pores are in diameter of 3-8mm, and are arranged at 6-11mm center-to-center spacing between each other. Preferably, the pores are in 5mm diameter, and the center-to-center spacing between the pores is 8mm.
The space between the furnace wall 4 and the rotary furnace hearth 2 is sealed by the water seal trough 1, and thereby the hearth is isolated from the atmosphere. The material 7 is laid on a fixed material bed on the bottom and is heated by the radiant tubes 5 mounted in the hearth; the free space 3 is created by structural supports between the material bed 15 and the rotary furnace hearth 2. The material bed 15 has evenly and densely distributed pores, and is equipped with the heat-resistant blower fan 9, wherein, the gas suction port 8 of the blower fan 9 is arranged in the free space 3 over the furnace hearth; driven by the blower fan 9, the pyrolysis gas passes through the material 7 from top to bottom and transfer heat to the material 7 in the process that it is sucked out of the hearth by the blower fan 9; after the pyrolysis gas produced from the reaction is cooled down, the pyrolysis products (coalite, tar, and coal gas) are obtained. With that method, the pyrolysis gas is driven by the blower fan to flow through the material layer, and the gas flow in the furnace is strengthened; thus, secondary combination between large-molecule free radicals produced from coal pyrolysis is reduced, and secondary pyrolysis of tar can be avoided; as a result, the tar yield from coal pyrolysis is improved.
The coal pyrolysis method for improving tar yield in the present invention is as follows: The crushed and screen dry material (in iO-8Omm particle size, with 8% moisture content) is loaded into the hearth of a retort furnace by a feeding device, the material passes through preheating area and reaction areas in the furnace, and the preheating area and reaction areas are controlled at 550-600 temperature. The total stay time of the material in the furnace is approx. I 00mm. The material bed in the retort furnace has pores in (P5mm diameter evenly distributed at 8mm center-to-center spacing. The coal gas produced from dry distillation of the material is driven by the blower fan to pass through the material from top to bottom; the heat value of the material at the inlet is 4200kcallkg; approx. 9% tar is produced after dry distillation, and the heat value of the tar is 4,SOOkcal/Nm3; the yield rate of coal gas is 18%; the yield rate of coalite is 62%, and the heat value of the coalite is approx. 6,400kcalIkg.
Claims (7)
- A coal pyrolysis apparatus for improving tar yield is provided, comprising a furnace body, wherein, a material bed for the material to he pyrolyzed is arranged over the furnace hearth of the furnace body, a free space is formed between the material bed and the furnace hearth, and the material bed is a ventilated material bed; a gas suction port is arranged on a side of the free space, and is connected to a heat-resistant blower fan and a gas blast port.
- 2. The coal pyrolysis apparatus for improving tar yield according to claim 1, wherein, the furnace body comprises fixed furnace wall, furnace top, and rotary furnace hearth, heating radiant tubes are arranged in the furnace body, and a water seal trough for sealing purpose is arranged between the furnace wall and the rotary furnace hearth.
- 3. The coal pyrolysis apparatus for improving tar yield according to claim I or 2, wherein, the material bed has evenly and densely distributed pores.
- 4. The coal pyrolysis apparatus for improving tar yield according to claim 3, wherein, the pores are in diameter of 3-8mm, and are distributed at 6-11mm center-to-center spacing.
- 5. The coal pyrolysis apparatus for improving tar yield according to claim 4, wherein, the pores are in diameter of 5mm, and are distributed at 8mm center-to-center spacing.
- 6. A coal pyrolysis method for improving tar yield used by the coal pyrolysis apparatus for improving tar yield according to claims l-5, comprising: loading a crushed and screened dry material onto a ventilated material bed in the hearth of a pyrolysis apparatus; sucking the coal gas produced from dry distillation of the material with a heat-resistant blower fan to flow out of material bed from the bottom and flow through the material from top to bottom.
- 7. The coal pyrolysis method for improving tar yield according to claim 6, wherein, the material is in 1O-8Onmi particle size.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101052714A CN102634354A (en) | 2012-04-11 | 2012-04-11 | Coal pyrolysis device and coal pyrolysis method for improving yield of tar |
| CN201220151448XU CN202519199U (en) | 2012-04-11 | 2012-04-11 | Coal pyrolysis equipment for improving yield of tar |
| PCT/CN2012/074027 WO2013152508A1 (en) | 2012-04-11 | 2012-04-13 | Coal pyrolysis device and coal pyrolysis method for improving yield of tar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201416425D0 GB201416425D0 (en) | 2014-10-29 |
| GB2514514A true GB2514514A (en) | 2014-11-26 |
Family
ID=49327018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1416425.5A Withdrawn GB2514514A (en) | 2012-04-11 | 2012-04-13 | Coal pyrolysis device and coal pyrolysis method for improving yield of tar |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2514514A (en) |
| WO (1) | WO2013152508A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109504409B (en) * | 2018-11-02 | 2024-01-02 | 北京鸿机装备科技有限公司 | Rotary bed pyrolysis device and method for carrying out oil sludge pyrolysis by adopting same |
| CN109401766B (en) * | 2018-11-02 | 2024-01-02 | 湖北亚首生物质新能源科技有限公司 | Rotary bed pyrolysis device and method for carrying out oil sludge pyrolysis by adopting same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4211632A (en) * | 1978-08-14 | 1980-07-08 | Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni G.M. Krzhizhanovskogo | Method for heat processing of pulverized brown coal |
| CN101712878A (en) * | 2009-11-23 | 2010-05-26 | 吴道洪 | Moving-bed retorting furnace heated comprehensively by radiant tube and circulating airflow |
| CN102277185A (en) * | 2011-07-19 | 2011-12-14 | 吴道洪 | Method for pyrolyzing coal by utilizing heat accumulating type revolving furnace |
| CN102391879A (en) * | 2011-09-23 | 2012-03-28 | 北京华福工程有限公司 | Rotary bed dry distillation furnace and method for improving yield of coal dry distillation tar by activating pyrolysis gas |
-
2012
- 2012-04-13 WO PCT/CN2012/074027 patent/WO2013152508A1/en active Application Filing
- 2012-04-13 GB GB1416425.5A patent/GB2514514A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4211632A (en) * | 1978-08-14 | 1980-07-08 | Gosudarstvenny Nauchno-Issledovatelsky Energetichesky Institut Imeni G.M. Krzhizhanovskogo | Method for heat processing of pulverized brown coal |
| CN101712878A (en) * | 2009-11-23 | 2010-05-26 | 吴道洪 | Moving-bed retorting furnace heated comprehensively by radiant tube and circulating airflow |
| CN102277185A (en) * | 2011-07-19 | 2011-12-14 | 吴道洪 | Method for pyrolyzing coal by utilizing heat accumulating type revolving furnace |
| CN102391879A (en) * | 2011-09-23 | 2012-03-28 | 北京华福工程有限公司 | Rotary bed dry distillation furnace and method for improving yield of coal dry distillation tar by activating pyrolysis gas |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201416425D0 (en) | 2014-10-29 |
| WO2013152508A1 (en) | 2013-10-17 |
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| 789A | Request for publication of translation (sect. 89(a)/1977) |
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