CN103087727B - External-heat vertical cylindrical dry-distillation furnace and application method thereof - Google Patents
External-heat vertical cylindrical dry-distillation furnace and application method thereof Download PDFInfo
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- CN103087727B CN103087727B CN201310042861.1A CN201310042861A CN103087727B CN 103087727 B CN103087727 B CN 103087727B CN 201310042861 A CN201310042861 A CN 201310042861A CN 103087727 B CN103087727 B CN 103087727B
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Abstract
The invention discloses an external-heat vertical cylindrical dry-distillation furnace and application method thereof. The dry-distillation furnace comprises a vertical cylindrical furnace body (1), a rotation feeding device (2), and a discharge device (3). Carbonization chambers (4) and combustion chambers (5) are alternately arranged in the vertical cylindrical furnace body (1). A dry-distillation product outlet (6) is arranged on the upper end of each carbonization chamber (4). A supporting column (8) is arranged at a central position of the vertical cylindrical furnace body (1). The discharge device (3) is arranged at the bottom of the supporting column (8). The rotation feeding device (2) is arranged on the top of the supporting column (8). An auxiliary material bin (9) and a coal storage bin (10) are arranged on the top of each carbonization chamber (4), and the auxiliary material bins (9) and the coal storage bins (10) are connected. According to the invention, the carbonization chambers and the combustion chambers are arranged alternately, such that the dry-distillation furnace has a compact structure, and the carbonization chambers can be uniformly heated. Also, raw gas quality can be effectively improved. A maximal production of semi-coke can reach 300000 tons.
Description
Technical field
The present invention relates to the particularly circular gas retort of a kind of outer hot vertical type and using method thereof of a kind of gas retort.
Background technology
At present, the gas retort that China is used is mostly internal thermal upright stove, there is the advantages such as reliable, fuel tolerance is strong, but because internal thermal upright stove is with hot flue gas direct heating carbonized material, therefore, upright furnace outlet destructive distillation product is that raw gas is the mixed gas of heating flue gas with dry distillation gas, has increased raw gas derived quantity, reduce raw gas quality, increased the load of recovery system.
In existing vertical type gas retort technology, be subject to the restriction of feed and drawing mechanism etc., separate unit scale is difficult to break through 100,000 tons/year, if can develop the vertical type gas retort of ten thousand tons/year of separate unit scale 20-30, and take into full account operational condition, taking dry distillation gas and tar as major product, blue charcoal is byproduct, will produce great effect to whole Coal at Low Temperature destructive distillation industry.
Summary of the invention
The object of the invention is to, the circular gas retort of a kind of outer hot vertical type and using method thereof are provided, and the structure formation of its employing coking chamber and the alternate layout in combustion chamber, not only makes gas retort compact construction, coking chamber be heated evenly, and can effectively improve raw gas calorific value, increase gas retort output.
Technical scheme of the present invention: the circular gas retort of a kind of outer hot vertical type, comprise the circular body of heater of vertical type, rotation feeding device and drawing mechanism, circumferentially alternate coking chamber and the combustion chamber of being furnished with, edge in the circular body of heater of vertical type, each coking chamber upper end is equipped with the outlet of destructive distillation product, the central position of the circular body of heater of vertical type is provided with pillar stiffener, drawing mechanism is arranged on the bottom of pillar stiffener, and rotation feeding device is arranged on the top of pillar stiffener; The top of each coking chamber is equipped with auxiliary feed bin and coal store, and auxiliary feed bin is connected with coal store.Coking chamber layout alternate with combustion chamber in circular gas retort, not only compact construction, takes up an area littlely, and can realize better the thermally equivalent of coking chamber.
In the circular gas retort of aforesaid this outer hot vertical type, two side walls in coking chamber are provided with zig-zag furnace wall.Adopt zig-zag furnace wall can effectively prevent furnace wall slagging scorification, increase ventilation property in stove.
In the circular gas retort of aforesaid this outer hot vertical type, in each combustion chamber, be equipped with regenerator, regenerator is located at the bottom of combustion chamber, and the inside of combustion chamber is divided into combustion channels and exhaust gases passes by partition wall, combustion channels and the exhaust gases passes top UNICOM in combustion chamber.Regenerator is set in combustion chamber, realize the heat exchange of flue gas with coal gas and combustion air, recovered flue gas heat effectively, top, combustion chamber is divided into combustion channels and exhaust gases passes, coal gas and combustion air are after regenerator preheating, enter combustion channels burning, the flue gas that burning produces enters regenerator through exhaust gases passes, discharges out of the furnace after emitting heat.
In the circular gas retort of aforesaid this outer hot vertical type, between auxiliary feed bin and coal store, be provided with coal valve.Adopt this structure can effectively ensure the pressure-stabilisation in coking chamber, prevent coal gas anti-channeling.
In the circular gas retort of aforesaid this outer hot vertical type, described rotation feeding device comprises cantilever, support platform, the funnel that connects material, funnel platform and conveyor connect material, support platform is fixed on the top of pillar stiffener, cantilever is fixed center pillar and rotary drive motor and support platform by cantilever and is rotationally connected, the top of the fixing center pillar link position of cantilever and cantilever is provided with the funnel platform that connects material, the funnel platform that connects material is provided with the funnel that connects material, conveyor is located on cantilever, on cantilever, be also provided with conveyor drive-motor, the main drive shaft on conveyor is connected with conveyor drive-motor; One end of cantilever is provided with the coking chamber funnel the other end that connects material and is provided with counterweight.
In the circular gas retort of aforesaid this outer hot vertical type, drawing mechanism comprises discharging disk, discharging belt conveyer, scraper and rotating machine, discharging disk is located at the bottom of pillar stiffener, discharging disk and pillar stiffener are rotationally connected, scraper is located at the top of discharging disk, and the below of scraper is located in one end of discharging belt conveyer; Rotating machine is located at the side of discharging disk, and discharging disk is connected with rotating machine, and rotating machine drives discharging disk rotation by geartransmission.Adopt this drawing mechanism, effectively solved the problem of coking chamber circle distribution blanking centralized collection.
The using method of the circular gas retort of a kind of outer hot vertical type, feed coal is added to the funnel that connects material, feed coal is scattered on conveyor through the funnel that connects material, by rotation feeding device cantilever through 360 ° of rotations, by conveyor, feed coal is delivered to each coking chamber, under the indirect heating effect of burning Indoor Thermal flue gas, feed coal slowly moves down in coking chamber, first enter the preheating section that is positioned at coking chamber top, feed coal enters retort section after preheating section is preheating to 200 DEG C～330 DEG C, retort section temperature is 600 DEG C～700 DEG C, feed coal decomposes and generates raw gas and blue charcoal in retort section, raw gas is entered and is cooled back receiving apparatus by the destructive distillation product outlet of coking chamber upper end, obtains tar and raw gas product, blue charcoal continues descending, by the cooling section of coking chamber bottom, is cooled to 250 DEG C～350 DEG C, then enters coke discharge box, the refrigerating unit arranging by coke discharge box both sides carries out cooling, and the discharging disk of the cooling circular bottom of furnace body of blue charcoal product introduction vertical type completing, then enters discharging belt conveyer, by blue charcoal product transmitting system.
In the using method of the circular gas retort of aforesaid this outer hot vertical type, first feed coal falls into the coking chamber funnel that connects material after conveyor falls, fall into coal store by the coking chamber funnel that connects material, the bottom of coal store is provided with coal valve, by the operational throughput of coal valve control feed coal, the feed coal falling from coal store enters the auxiliary feed bin being connected with coal valve, finally enters coking chamber by auxiliary feed bin.
In the using method of the circular gas retort of aforesaid this outer hot vertical type, the refrigerating unit employing water spray of described coke discharge box both sides is cooling or spraying steam is cooling.
In the using method of the circular gas retort of aforesaid this outer hot vertical type, described feed coal enters retort section after preheating section is preheating to 240 DEG C～290 DEG C, and retort section temperature is 630 DEG C～680 DEG C.
Compared with prior art, because the present invention adopts the structure formation of the alternate layout of coking chamber and combustion chamber, adopt this external-heat type of heating, heating flue gas does not mix with dry distillation gas, therefore raw gas is dry distillation gas, and in the raw gas composition of generation, hydrogen and carbon monoxide content can reach more than 60%, for follow-up raw gas processing unit (plant) provides the unstripped gas of high-quality, and raw gas calorific value is the more than 2 times of traditional internal thermal upright stove raw gas calorific value.Owing to adopting structure formation of the present invention, make the blue charcoal annual production of vertical type gas retort separate unit reach as high as 300,000 tons in addition, have huge progress compared with hot gas retort in traditional vertical type.
Because the present invention is provided with rotation feeding device, make the circular body of heater of vertical type to enter coal more convenient, quick.
Due to regenerator being set in combustion chamber, realize the heat exchange of flue gas with coal gas and combustion air, effectively recovered flue gas heat.
In addition, coal valve is set and has effectively prevented coking chamber coal gas anti-channeling.The problem that discharging disk efficiently solves the bad centralized collection of coking chamber circle distribution blanking is set.
Through constantly contrast in engineering practice, the product of hot vertical type gas retort in the present invention and tradition has been done a contrast by technician, as following table:
The upright gas retort composition of coal gas contrast of inside and outside hot type
Can be analyzed and be drawn by upper table, raw gas calorific value of the present invention is the more than 2 times of traditional internal thermal upright gas retort, and blue charcoal annual production can reach 300,000 tons.
Brief description of the drawings
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is the cross section structure schematic diagram of the circular body of heater of vertical type;
Fig. 3 is the internal structure schematic diagram of combustion chamber;
Fig. 4 is the structural representation of coking chamber furnace wall;
Fig. 5 is the structural representation of rotation feeding device.
Being labeled as in accompanying drawing: the circular body of heater of 1-vertical type, 2-rotates feeding device, 3-drawing mechanism, 4-coking chamber, 5-combustion chamber, the outlet of 6-destructive distillation product, 7-regenerator, 8-pillar stiffener, 9-assists feed bin, 10-coal store, 11-furnace wall, 12-partition wall, 13-combustion channels, 14-exhaust gases passes, 15-coal valve, 16-cantilever, 17-support platform, the 18-funnel that connects material, the 19-funnel platform that connects material, 20-conveyor, 21-cantilever is fixed center pillar, 22-rotary drive motor, 23-conveyor drive-motor, 24-main drive shaft, the 25-coking chamber funnel that connects material, 26-counterweight, 27-discharging belt conveyer, 28-discharging disk, 29-scraper, 30-rotating machine.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, but not as the foundation of the present invention being done to any restriction.
Embodiments of the invention 1: as depicted in figs. 1 and 2, the circular gas retort of a kind of outer hot vertical type, comprise the circular body of heater 1 of vertical type, rotation feeding device 2 and drawing mechanism 3, circumferentially alternate coking chamber 4 and the combustion chamber 5 of being furnished with, the interior edge of the circular body of heater 1 of vertical type, each coking chamber 4 upper ends are equipped with destructive distillation product outlet 6, the central position of the circular body of heater 1 of vertical type is provided with pillar stiffener 8, and drawing mechanism 3 is arranged on the bottom of pillar stiffener 8, and rotation feeding device 2 is arranged on the top of pillar stiffener 8; The top of each coking chamber 4 is equipped with auxiliary feed bin 9 and coal store 10, and auxiliary feed bin 9 is connected with coal store 10.
Drawing mechanism 3 comprises discharging disk 28, discharging belt conveyer 27, scraper 29 and rotating machine 30, discharging disk 28 is located at the bottom of pillar stiffener 8, discharging disk 28 is rotationally connected with pillar stiffener 8, and scraper 29 is located at the top of discharging disk 28, and the below of scraper 29 is located in one end of discharging belt conveyer 27; Rotating machine 30 is located at the side of discharging disk 28, and discharging disk 28 is connected with rotating machine 30, and rotating machine 30 drives discharging disk 28 to rotate by geartransmission.
As shown in Figure 4, two side walls in coking chamber 4 are provided with zig-zag furnace wall 11.
As shown in Figure 3, in each combustion chamber 5, be equipped with regenerator 7, regenerator 7 is located at the bottom of combustion chamber 5, and the inside of combustion chamber 5 is divided into combustion channels 13 and exhaust gases passes 14 by partition wall 12, combustion channels 13 and the exhaust gases passes 14 top UNICOM in combustion chamber 5.
As shown in Figure 5, rotation feeding device 2 comprises cantilever 16, support platform 17, funnel 18 connects material, funnel platform 19 and conveyor 20 connect material, support platform 17 is fixed on the top of pillar stiffener 8, cantilever 16 fixes center pillar 21 by cantilever and rotary drive motor 22 is rotationally connected with support platform 17, cantilever 16 is provided with the top of fixing center pillar 21 link positions of cantilever the funnel platform 19 that connects material, the funnel platform 19 that connects material is provided with the funnel 18 that connects material, conveyor 20 is located on cantilever 16, on cantilever 16, be also provided with conveyor drive-motor 23, main drive shaft 24 on conveyor 20 is connected with conveyor drive-motor 23, one end of cantilever 16 is provided with coking chamber funnel 25 the other ends that connect material and is provided with counterweight 26.
The using method of the circular gas retort of a kind of outer hot vertical type, feed coal is added to the funnel 18 that connects material, feed coal is scattered on conveyor 20 through the funnel 18 that connects material, by rotation feeding device 2 cantilever 16 through 360 ° of rotations, by conveyor 20, feed coal is delivered to each coking chamber 4, first feed coal falls into the coking chamber funnel 25 that connects material after conveyor 20 falls, fall into coal store 10 by the coking chamber funnel 25 that connects material, the bottom of coal store 10 is provided with coal valve 15, control the operational throughput of feed coal by coal valve 15, the feed coal falling from coal store 10 enters the auxiliary feed bin 9 being connected with coal valve 15, finally enter coking chamber 4 by auxiliary feed bin 9.Under the indirect heating effect of combustion chamber 5 interior hot flue gases, feed coal slowly moves down coking chamber 4 is interior, first enter the preheating section that is positioned at coking chamber 4 tops, feed coal enters retort section after preheating section is preheating to 200 DEG C～330 DEG C, retort section temperature is 600 DEG C～700 DEG C, and feed coal decomposes and generates raw gas and blue charcoal in retort section; Raw gas is entered and is cooled back receiving apparatus by the destructive distillation product outlet 6 of coking chamber 4 upper ends, obtains tar and raw gas product; Blue charcoal continues descending, by the cooling section of coking chamber 4 bottoms, is cooled to 250 DEG C～350 DEG C, then enters coke discharge box; The equipment water jetting cooler arranging by coke discharge box both sides carries out cooling, then enters discharging belt conveyer 27 through the discharging disk 28 of the circular body of heater of vertical type 1 bottom, by blue charcoal product transmitting system.
In addition, the principle of work of regenerator is, coal gas and combustion air are after regenerator (side of regenerator arrow upward direction is shown in Fig. 3) preheating, entering combustion channels 13 burns, the flue gas that burning produces enters regenerator opposite side (as a side of arrow downward direction in Fig. 3) through exhaust gases passes 14, discharges out of the furnace after emitting heat.After the regular hour, the gas commutation of regenerator 7 both sides, coal gas and combustion air enter through former flue gas discharge side, absorb the heat of regenerator 7; Flue gas is discharged through crude gas and combustion air approaching side, reaches the object of accumulation of heat.
Embodiments of the invention 2: the circular gas retort structure division of outer hot vertical type of the present embodiment is identical with the circular gas retort structure of outer hot vertical type in embodiment 1, and difference is only the using method of outer hot vertical type gas retort:
The using method of the circular gas retort of a kind of outer hot vertical type, feed coal is added to the funnel 18 that connects material, feed coal is scattered on conveyor 20 through the funnel 18 that connects material, by rotation feeding device 2 cantilever 16 through 360 ° of rotations, by conveyor 20, feed coal is delivered to each coking chamber 4, first feed coal falls into the coking chamber funnel 25 that connects material after conveyor 20 falls, fall into coal store 10 by the coking chamber funnel 25 that connects material, the bottom of coal store 10 is provided with coal valve 15, control the operational throughput of feed coal by coal valve 15, the feed coal falling from coal store 10 enters the auxiliary feed bin 9 being connected with coal valve 15, finally enter coking chamber 4 by auxiliary feed bin 9.Under the indirect heating effect of combustion chamber 5 interior hot flue gases, feed coal slowly moves down coking chamber 4 is interior, first enter the preheating section that is positioned at coking chamber 4 tops, feed coal enters retort section after preheating section is preheating to 240 DEG C～290 DEG C, retort section temperature is 630 DEG C～680 DEG C, and feed coal decomposes and generates raw gas and blue charcoal in retort section; Raw gas is entered and is cooled back receiving apparatus by the destructive distillation product outlet 6 of coking chamber 4 upper ends, obtains tar and raw gas product; Blue charcoal continues descending, by the cooling section of coking chamber 4 bottoms, is cooled to 250 DEG C～350 DEG C, then enters coke discharge box; The steam cooling device arranging by coke discharge box both sides carries out cooling, then enters discharging belt conveyer 27 through the discharging disk 28 of the circular body of heater of vertical type 1 bottom, by blue charcoal product transmitting system.
In addition, the principle of work of regenerator is, coal gas and combustion air are after regenerator (side of regenerator arrow upward direction is shown in Fig. 3) preheating, entering combustion channels 13 burns, the flue gas that burning produces enters regenerator opposite side (as a side of arrow downward direction in Fig. 3) through exhaust gases passes 14, discharges out of the furnace after emitting heat.After the regular hour, the gas commutation of regenerator 7 both sides, coal gas and combustion air enter through former flue gas discharge side, absorb the heat of regenerator 7; Flue gas is discharged through crude gas and combustion air approaching side, reaches the object of accumulation of heat.
The principle of work of rotation feeding device is according to the time of the required coal of coking chamber and coal amount, to adjust velocity of rotation and the conveyor rotating speed of cantilever 16, regularly to the quantitative feed coal of the interior interpolation of funnel 18 that connects material.Feed coal is scattering on conveyor 20 along the funnel 18 that connects material after adding the funnel 18 that connects material to, the coking chamber that conveyor 20 is transported to feed coal cantilever 16 under the drive of conveyor drive-motor 23 funnel 25 that connects material, (note: can also can pass through belt transmission by chain gear between conveyor 20 and conveyor drive-motor 23.) according to the time setting, in the time that cantilever 16 passes through the coal store 10 of charring furnace 4 tops, accurately locate and start feeding system, quantitative feed coal joins in coal store 10 by the funnel 25 that connects material, feed coal in coal store 10 falls into auxiliary feed bin 9 in the effect of coal valve 15, and then joins in charring furnace 4.In addition, when conveyor 20 is worked, cantilever 16 does 360 degree rotations (fix a point reinforced in cantilever stop the rotation) under the drive of rotary drive motor 22.
Claims (8)
1. the circular gas retort of outer hot vertical type, it is characterized in that: comprise the circular body of heater of vertical type (1), rotation feeding device (2) and drawing mechanism (3), circumferentially alternate coking chamber (4) and combustion chamber (5) of being furnished with, edge in the circular body of heater of vertical type (1), each coking chamber (4) upper end is equipped with destructive distillation product outlet (6), the central position of the circular body of heater of vertical type (1) is provided with pillar stiffener (8), drawing mechanism (3) is arranged on the bottom of pillar stiffener (8), and rotation feeding device (2) is arranged on the top of pillar stiffener (8); The top of each coking chamber (4) is equipped with auxiliary feed bin (9) and coal store (10), and auxiliary feed bin (9) is connected with coal store (10); Two side walls in coking chamber (4) are provided with zig-zag furnace wall (11); In each combustion chamber (5), be equipped with regenerator (7), regenerator (7) is located at the bottom of combustion chamber (5), the inside of combustion chamber (5) is divided into combustion channels (13) and exhaust gases passes (14) by partition wall (12), combustion channels (13) and the top UNICOM of exhaust gases passes (14) in combustion chamber (5).
2. the circular gas retort of the outer hot vertical type of one according to claim 1, is characterized in that: between auxiliary feed bin (9) and coal store (10), be provided with coal valve (15).
3. the circular gas retort of the outer hot vertical type of one according to claim 1, it is characterized in that: described rotation feeding device (2) comprises cantilever (16), support platform (17), funnel (18) connects material, funnel platform (19) and conveyor (20) connect material, support platform (17) is fixed on the top of pillar stiffener (8), cantilever (16) fixes center pillar (21) by cantilever and rotary drive motor (22) is rotationally connected with support platform (17), cantilever (16) is provided with the top of fixing center pillar (21) link position of cantilever the funnel platform (19) that connects material, the funnel platform (19) that connects material is provided with the funnel that connects material (18), conveyor (20) is located on cantilever (16), on cantilever (16), be also provided with conveyor drive-motor (23), main drive shaft (24) on conveyor (20) is connected with conveyor drive-motor (23), one end of cantilever (16) is provided with the coking chamber funnel (25) that connects material, and the other end is provided with counterweight (26).
4. the circular gas retort of the outer hot vertical type of one according to claim 3, it is characterized in that: drawing mechanism (3) comprises discharging disk (28), discharging belt conveyer (27), scraper (29) and rotating machine (30), discharging disk (28) is located at the bottom of pillar stiffener (8), discharging disk (28) is rotationally connected with pillar stiffener (8), scraper (29) is located at the top of discharging disk (28), and the below of scraper (29) is located in one end of discharging belt conveyer (27); Rotating machine (30) is located at the side of discharging disk (28), and discharging disk (28) is connected with rotating machine (30).
5. the using method of the circular gas retort of outer hot vertical type claimed in claim 4, it is characterized in that: feed coal is added to the funnel that connects material (18), feed coal is scattered on conveyor (20) through the funnel that connects material (18), by rotation feeding device (2) cantilever (16) through 360 ° of rotations, by conveyor (20), feed coal is delivered to each coking chamber (4), in combustion chamber (5) under the indirect heating effect of hot flue gas, feed coal slowly moves down in coking chamber (4), first enter the preheating section that is positioned at coking chamber (4) top, feed coal enters retort section after preheating section is preheating to 200 DEG C～330 DEG C, retort section temperature is 600 DEG C～700 DEG C, feed coal decomposes and generates raw gas and blue charcoal in retort section, raw gas is entered and is cooled back receiving apparatus by the destructive distillation product outlet (6) of coking chamber (4) upper end, obtains tar and raw gas product, blue charcoal continues descending, by the cooling section of coking chamber (4) bottom, is cooled to 250 DEG C～350 DEG C, then enters coke discharge box, the refrigerating unit arranging by coke discharge box both sides carries out cooling, and the discharging disk (28) of the cooling circular body of heater of blue charcoal product introduction vertical type (1) bottom completing, then enters discharging belt conveyer (27), by blue charcoal product transmitting system.
6. the using method of the circular gas retort of a kind of outer hot vertical type according to claim 5, it is characterized in that: first feed coal falls into the coking chamber funnel (25) that connects material after conveyor (20) falls, fall into coal store (10) by the coking chamber funnel (25) that connects material, the bottom of coal store (10) is provided with coal valve (15), control the operational throughput of feed coal by coal valve (15), the feed coal falling from coal store (10) enters the auxiliary feed bin (9) being connected with coal valve (15), finally enters coking chamber (4) by auxiliary feed bin (9).
7. the using method of the circular gas retort of a kind of outer hot vertical type according to claim 5, is characterized in that: the refrigerating unit employing of described coke discharge box both sides is sprayed water cooling or spraying steam is cooling.
8. the using method of the circular gas retort of a kind of outer hot vertical type according to claim 5, is characterized in that: described feed coal enters retort section after preheating section is preheating to 240 DEG C～290 DEG C, and retort section temperature is 630 DEG C～680 DEG C.
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| CN201310042861.1A CN103087727B (en) | 2013-02-01 | 2013-02-01 | External-heat vertical cylindrical dry-distillation furnace and application method thereof |
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| CN105295967B (en) * | 2015-11-12 | 2017-12-26 | 盐城工学院 | A kind of carbon-based raw material external-heat pyrolysis reactor of high humidity |
| CN105295961B (en) * | 2015-11-27 | 2018-02-06 | 华电重工股份有限公司 | A kind of gas retort and its combustion chamber |
| CN106398732A (en) * | 2016-10-28 | 2017-02-15 | 湖北鑫固久技术装备有限公司 | Process and device for poly-generation quality improvement of low-quality coal |
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| CN203095971U (en) * | 2013-02-01 | 2013-07-31 | 华电重工股份有限公司 | Externally heated vertical type circular destructive distillation furnace |
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| CN2329640Y (en) * | 1998-03-24 | 1999-07-21 | 台儿庄区面粉厂粮食输送机械厂 | Rotary belt-conveyer |
| CN201301298Y (en) * | 2008-11-13 | 2009-09-02 | 武汉科技大学 | Duplex exhaust gas reversed jet circulation stamp charging coke oven |
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| CN203095971U (en) * | 2013-02-01 | 2013-07-31 | 华电重工股份有限公司 | Externally heated vertical type circular destructive distillation furnace |
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