CN204006647U - Semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace - Google Patents
Semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace Download PDFInfo
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- CN204006647U CN204006647U CN201420254234.4U CN201420254234U CN204006647U CN 204006647 U CN204006647 U CN 204006647U CN 201420254234 U CN201420254234 U CN 201420254234U CN 204006647 U CN204006647 U CN 204006647U
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Abstract
The utility model provides a kind of semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, and fuel applications is extensive, and fuel combustion is abundant, and heat utilization rate is high, and hot blast temperature is high, and temperature easily regulates, flue dust is few.A semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, comprises burning portion, transition passage and heat exchange portion in body of heater; Burning portion comprises the first combustion chamber and is positioned at the second combustion chamber of the first below, combustion chamber, the outlet of flue gas thermal current is set in the second bottom, combustion chamber; The hot flue gas that fuel combustion produces comes downwards to the second combustion chamber by the first combustion chamber successively, then through crossing passage, enters heat exchange portion from the flue gas thermal current outlet of the second bottom, combustion chamber.
Description
Technical field
The utility model relates to a kind of hot-blast stove, is specifically related to a kind of semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace.
Background technology
Hot-blast stove product can be widely used in: the oven dry of the products such as timber, stone material, chemical industry, machinery, paint spraying and baking streamline, pharmacy drying production line; The products such as agricultural byproducts processing, marine products aquatic products, vegetables, preserved fruit, dry fruit, vinasse, mud dehydrate and large car between, the heating temperature adjustment in the place such as herding pouity dwelling place.
Hot-blast stove mainly adopts single combustion chamber or double combustion chamber's structure, normal burning heat exchange system at present.So-called normal burning refers to that combustion product gases rises to Heat Room naturally, and heating heat exchange element also produces hot blast then.Patent 201220703503.1 discloses a kind of vertical double combustion chamber vertical hot furnace, the mid-group switching centre heat pipe with holes in the second combustion chamber; Patent 200620097656,201020664919.8 discloses a kind of vertical double combustion chamber without heat pipe vertical hot furnace.Vertical hot furnace flue gas and combustion flame are fast by burner hearth speed, and heat exchange efficiency is low.Patent 200720173511.9 discloses a kind of horizontal double combustion chamber hot-blast stove, but first adopt bituminous coal, the second combustion chamber to adopt anthracite, timber etc., and heat exchanger tube is still one vertical.Although patent 93223796.7 adopts horizontal type heat pipe to arrange, adopts single chamber combustion system, burns insufficient, heat pipe heat exchanging effect does not fully demonstrate out.
Hot-blast stove ubiquity fuel combustion is at present insufficient, and heat utilization rate is low, and hot blast temperature is low, and easily produces the problems such as volume of smoke.
Utility model content
The purpose of this utility model is to provide a kind of semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, and fuel applications is extensive, and fuel combustion is abundant, and heat utilization rate is high, and hot blast temperature is high, and temperature easily regulates, flue dust is few.
To achieve these goals, the utility model adopts technical scheme as follows:
A semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, comprises burning portion, transition passage and heat exchange portion in body of heater; Burning portion comprises the first combustion chamber and is positioned at the second combustion chamber of the first below, combustion chamber, the outlet of flue gas thermal current is set in the second bottom, combustion chamber; The hot flue gas that fuel combustion produces comes downwards to the second combustion chamber by the first combustion chamber successively, then through crossing passage, enters heat exchange portion from the flue gas thermal current outlet of the second bottom, combustion chamber.
Further, heat exchange portion comprises housing, heat-insulation layer, hollow sandwich and the high temperature resistant wall that ecto-entad sets gradually, and high temperature resistant wall is the high temperature resistant body of wall that refractory material laying forms, and heat-insulation layer is insulating brick, heat-preservation cotton or alumina silicate fiber felt.。
Further, heat exchange portion comprises multi-stage heat exchanger chamber; Heat Rooms at different levels are connected successively, and between Heat Room, are provided with partition wall; In partition wall in odd bits order, exhaust gases passes is left in crown center position, and exhaust gases passes is left in the centre position, partition wall bottom in even bit order; Every grade of Heat Room comprises a plurality of heat exchanger tubes, and heat exchanger tube is along the vertical direction arranged crosswise of body of heater, and the two ends of each heat exchanger tube are arranged on respectively on the high temperature resistant wall of heat exchange portion; In the Heat Room of next-door neighbour's transition passage, adopt resistant to elevated temperatures aluminium oxide or silicon carbide ceramic.
Further, the partition wall in final stage extends in heat-insulation layer and seals in inlet of cold air one side, at inlet of cold air offside, builds to high temperature resistant wall sealing; Next stage partition wall extends in heat-insulation layer and seals at inlet of cold air offside, and builds to high temperature resistant wall sealing at inlet of cold air offside; Next stage partition wall block system identical with final stage cross wall, so analogizes again; And partition wall bottom is provided with open channel.
Further, top one side of body of heater heat exchange portion final stage Heat Room is provided with the air blast being connected through pipeline with cold wind import, hot-blast outlet arranges Heat Room middle and upper part, and hot-blast outlet and cold wind import are positioned at heat exchange portion one or both sides, and cold wind import is positioned at the middle and lower part of final stage Heat Room.
Further, hollow sandwich is divided into upper and lower two parts at cold wind inlet side by demarcation strip, and top is for cold and hot air turnover, and lower floor is preheating channel.
Further, below every grade of Heat Room, be provided with the dirt pocket of dedusting mouth.
Further, lower portion of furnace body also comprises combustion-aid structure two, three times, two, three combustion-aid structures comprise accumulation of heat dead level, combustion air passage and a plurality of combustion-supporting through hole, combustion air passage is from heat exchange portion cold wind import one side, be communicated to the second combustion chamber and transition passage, combustion-supporting through hole is arranged on bottom, top and the sidewall of the second sidewall of combustion chamber and transition passage.
Further, in heat exchange portion upper end one side, cold wind is sent into hollow sandwich by air blast, via final stage heat exchanger tube, adverse current is discharged after one-level heat exchanger tube becomes hot blast successively; Heat exchange portion end top arranges exhanst gas outlet, and exhanst gas outlet connects air-introduced machine import, and air-introduced machine outlet connects chimney.
Further, heat exchange portion the first top of combustion chamber is provided with wind air inlet pipe one time, and in air inlet pipe, is provided with stop valve, below stop valve, makes a wind air inlet pipe communicate with chimney middle and lower part naturally emptying communicating pipe; Between the first combustion chamber and the second combustion chamber, be provided with the first grate, the second below, combustion chamber is provided with ash-falling chamber, between the second combustion chamber and ash-falling chamber, be provided with the second grate, the second bottom, combustion chamber be provided with for loose combustion residue to outward opening, ash-falling chamber has for outwards clearing up the ash hole of lime-ash, and the second grate aperture is less than the first grate aperture.
The beneficial effects of the utility model:
Hot-blast stove comprises two combustion chambers, and formula burning gases path is returned in employing, and (semi-coal gas producing while being fuel primary combustion first comes downwards to the second combustion chamber, and then laterally enter Heat Room by transition passage), prolonging combustion process, abundant warm-up combustion-supporting air, the semi-coal gas producing while promoting fuel primary combustion is further fully burning again, improves ignition temperature, gives full play to the heat energy of fuel; In addition, the descending mode of burning indoor gas, also promotes the sedimentation of flue dust, is conducive to gas cleaning, and fuel combustion is abundant, and heat utilization rate is high, and hot blast temperature is high, and flue dust is few.
Accompanying drawing explanation
Fig. 1 is that the master of the selected embodiment of the utility model looks schematic diagram.
Fig. 2 is the selected embodiment burning of the utility model portion side structure schematic diagram.
Fig. 3 is body of heater heat exchange portion top schematic top plan view, and in figure, dotted line represents cold wind trend.
Fig. 4 is body of heater heat exchange subordinate portion schematic top plan view.
Fig. 5 is heat exchange portion internal structure schematic diagram, and in figure, arrow represents flue gas trend.
Fig. 6 is via arrangement structural representation.
In figure 1, burning portion, 2, heat exchange portion, 3, transition passage, 4, the first combustion chamber, 5, the second combustion chamber, 6, ash-falling chamber, 7, fuel inlet, 8 break mouths, 9, to outward opening, 10, ash hole, 11, hot exhanst gas outlet, 12, the first grate, 13, the second grate, 14, housing, 15 heat-insulation layers, 16, hollow sandwich, 17, high temperature resistant wall, 18, partition wall, 19, accumulation of heat dead level, 20, preheating channel, 21, combustion air passage, 22, combustion-supporting through hole, 23, high-temperature heat exchange tube, 24, general heat exchanger tube, 25, exhanst gas outlet, 26, air-introduced machine, 27, chimney, 28, naturally emptying communicating pipe, 29, a wind air inlet pipe, 30, stop valve, 31, air blast, 32, cold wind blast pipe, 33, cold wind enters heat exchanger tube region, 34, hot-blast outlet, 35, dirt pocket, 36, dedusting mouth, 37, demarcation strip, 38, exhaust gases passes.
The specific embodiment
For the ease of those skilled in the art, better understand the utility model, below in conjunction with accompanying drawing and instantiation, the utility model is described in further details, following is only the exemplary protection domain of the present utility model that do not limit.
A semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, comprises burning portion 1 and heat exchange portion 2 in body of heater.Burning portion 1 comprises the second combustion chamber 5 that has the first combustion chamber 4 and be positioned at 4 belows, the first combustion chamber, a wind air inlet pipe 29 is set for introduce primary air to combustion chamber on top, Qie combustion chamber, body of heater top, between the first combustion chamber 4 and the second combustion chamber 5, be provided with the first grate 12, the first 4 tops, combustion chamber is provided with fuel inlet 7 for adding coal or biomass fuel, between the first 4 bottom to the first grate 12 positions, combustion chamber, fuel takes fire, the first 4 bottoms, combustion chamber is provided with break mouth 8, with prevent burning coal or biomass fuel at the first grate 12 and with upper part coking.The second 5 belows, combustion chamber is provided with ash-falling chamber 6, between the second combustion chamber 5 and ash-falling chamber 6, be provided with the second grate 13, and the second grate 13 apertures are less than the first grate 12 apertures, to catch the small sized particles fuel falling from the first combustion chamber 4, fully burning again, the second 5 bottoms, combustion chamber be provided with flue gas thermal current outlet 11 and for loose combustion residue to outward opening 9, ash-falling chamber 6 has for outwards clearing up the ash hole 10 of lime-ash, the semi-coal gas of fuel after the first combustion chamber 4 primary combustions enters the second combustion chamber 5, the burning particles that part is imperfect combustion falls into the second combustion chamber 5 through the first grate 12, imperfect combustion burning particles and semi-coal gas further burn in the second combustion chamber 5.
In order to guarantee that the gas that enters heat exchange portion 2 obtains high temperature, the transition passage 3 communicating with heat exchange portion 2 in the second combustion chamber 5 end face settings enters the time of heat exchange portion 2 for combustion-supporting prolongation air-flow again.
Heat exchange portion 2 comprises housing 14, heat-insulation layer 15, hollow sandwich 16 and the high temperature resistant wall 17 that ecto-entad sets gradually, the high temperature resistant body of wall that high temperature resistant wall 17 forms for refractory material laying, and heat-insulation layer 15 is insulating brick, heat-preservation cotton or alumina silicate fiber felt.Heat exchange portion 2 comprises multi-stage heat exchanger chamber, is generally 3 ~ 5 grades; Heat Room is connected successively; What communicate with transition passage 3 is one-level Heat Room, the like; Between Heat Rooms at different levels, be provided with partition wall 18, the top of the partition wall 18 between one-level Heat Room and secondary heat exchange chamber has exhaust gases passes 38, the bottom of secondary heat exchange chamber and three grades of Heat Room partition walls has exhaust gases passes 38, the like, exhaust gases passes 38 is left in the partition wall crown center position that is odd bits order, and exhaust gases passes 38 is left in centre position, the partition wall of even bit order bottom; Every grade of Heat Room comprises a plurality of heat exchanger tubes, and heat exchanger tube is along the vertical direction arranged crosswise of body of heater, and the two ends of each heat exchanger tube are arranged on respectively on the high temperature resistant wall of heat exchange portion.
for guaranteeing the adverse current of heat exchange wind below,partition wall in final stage extends in heat-insulation layer and seals in inlet of cold air one side, at inlet of cold air offside, builds to high temperature resistant wall sealing; Next stage partition wall extends in heat-insulation layer and seals at inlet of cold air offside, and builds to high temperature resistant wall sealing at inlet of cold air offside; Next stage partition wall block system identical with final stage cross wall, so analogizes again; And partition wall bottom is provided with open channel; And all partition walls leave open channel.
From final stage Heat Room one side of heat exchange portion 2, by air blast 31, by cold wind blast pipe 32, blast cold wind, after entering final stage Heat Room heat exchanger tube region 33 and being heated, from the heat exchanger tube other end, through top interlayer, enter each heat exchanger tube of penultimate stage Heat Room, after heating, by the other end, enter level heat exchanger tube third from the bottom, the like, until enter one end (i.e. contrary smoke gas flow direction) of each heat exchanger tube of first order Heat Room, after high-temperature heating, by the other end of each heat exchanger tube of first order Heat Room, discharge and enter equipment to be heated or space via hot-blast outlet 34.Every grade of Heat Room 22 belows are provided with the dirt pocket 35 with dedusting mouth 36.Take three grades arrange that heat exchange portions are example, in reality, the 1st grade of Heat Room next-door neighbour transition passage 3, consists of resistant to elevated temperatures carborundum or corundum high-temperature heat exchange tube 23 arrays.Due to the setting of composite chamber and transition passage, flue gas enters the prolongation of heat exchange portion path, in addition combustion-supporting due to semi-coal gas, full combustion of fuel, the initial temperature that enters Heat Room 1 is very high, and carborundum or corundum hollow tube can prevent high-temperature heating distortion, extend lifetime of hot-air stove.2nd, 3 ... .. level adopts the array that ordinary hot wind furnace forms with the general heat exchanger tube 24 of steel.According to user's needs, heat exchanger tube arrays at different levels can all adopt carbon steel, No. 20 boiler tubes or stainless steel tube.
The present embodiment hollow sandwich 16 is divided into upper and lower two parts at cold wind inlet side by demarcation strip 37, and top is for cold and hot air turnover, and lower floor is preheating channel 20.
In the present embodiment, also comprise secondary, three combustion-aid structures; Secondary and three combustion-aid structures comprise accumulation of heat dead level 19, combustion air passage 21 and a plurality of combustion-supporting through hole 22, combustion air passage 21 is communicated to the second combustion chamber 5, transition passage 3 from the end of heat exchange portion 2, and combustion-supporting through hole 22 is arranged on top, bottom and the sidewall of the second sidewall of combustion chamber and transition passage 3.The wind shunting that secondary and three combustion airs are blasted by air blast 31, enter in preheating channel 20, and become secondary and three combustion airs through preheating, through combustion air passage 21 and combustion-supporting through hole 22, enter the second combustion chamber 5 and transition passage 3, play enhanced fuel burning, more can give full play to the heat energy effect of fuel.
On top, Qie combustion chamber, body of heater top, wind air inlet pipe 29 is set one time, heat exchange portion end 5 tops arrange exhanst gas outlet 25, exhanst gas outlet 25 connects air-introduced machine 26 imports, air-introduced machine 26 outlets connect chimney 27, chimney 27 middle and lower parts communicated with a wind air inlet pipe 29 through naturally emptying communicating pipe 28, and a wind air inlet pipe 29 is provided with stop valve 30.When hot-blast stove normal combustion heating work of the present invention, due to the draft of air-introduced machine 26, stop valve 30 is opened automatically, so that primary air enters combustion chamber; When hot-blast stove stops heating air-introduced machine 26 and cuts out, stop valve 30 is closed automatically, and combustion chamber residual gas was discharged via chimney 27 by emptying communicating pipe 28 of nature.
Below only described basic principle of the present utility model and preferred embodiment, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection domain of the present utility model.
Claims (10)
1. a semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace, is characterized in that: in body of heater, comprise burning portion, transition passage and heat exchange portion; Burning portion comprises the first combustion chamber and is positioned at the second combustion chamber of the first below, combustion chamber, the outlet of flue gas thermal current is set in the second bottom, combustion chamber; The hot flue gas that fuel combustion produces comes downwards to the second combustion chamber by the first combustion chamber successively, then through crossing passage, enters heat exchange portion from the flue gas thermal current outlet of the second bottom, combustion chamber.
2. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 1, it is characterized in that: heat exchange portion comprises housing, heat-insulation layer, hollow sandwich and the high temperature resistant wall that ecto-entad sets gradually, high temperature resistant wall is the high temperature resistant body of wall that refractory material laying forms, and heat-insulation layer is insulating brick, heat-preservation cotton or alumina silicate fiber felt.
3. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 2, is characterized in that: heat exchange portion comprises multi-stage heat exchanger chamber; Heat Rooms at different levels are connected successively, and between Heat Room, are provided with partition wall; In partition wall in odd bits order, exhaust gases passes is left in crown center position, and exhaust gases passes is left in the centre position, partition wall bottom in even bit order; Every grade of Heat Room comprises a plurality of heat exchanger tubes, and heat exchanger tube is along the vertical direction arranged crosswise of body of heater, and the two ends of each heat exchanger tube are arranged on respectively on the high temperature resistant wall of heat exchange portion; In the Heat Room of next-door neighbour's transition passage, adopt resistant to elevated temperatures aluminium oxide or silicon carbide ceramic.
4. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 3, is characterized in that: the partition wall in final stage extends in heat-insulation layer and seals in inlet of cold air one side, at inlet of cold air offside, builds to high temperature resistant wall sealing; Next stage partition wall extends in heat-insulation layer and seals at inlet of cold air offside, and builds to high temperature resistant wall sealing at inlet of cold air offside; Next stage partition wall block system identical with final stage cross wall, so analogizes again; And partition wall bottom is provided with open channel.
5. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 3, it is characterized in that: top one side of body of heater heat exchange portion final stage Heat Room is provided with the air blast being connected through pipeline with cold wind import, hot-blast outlet arranges Heat Room middle and upper part, hot-blast outlet and cold wind import are positioned at heat exchange portion one or both sides, and cold wind import is positioned at the middle and lower part of final stage Heat Room.
6. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 5, is characterized in that: hollow sandwich is divided into upper and lower two parts at cold wind inlet side by demarcation strip, and top is for cold and hot air turnover, and lower floor is preheating channel.
7. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 3, is characterized in that: every grade of Heat Room below is provided with the dirt pocket of dedusting mouth.
8. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 5, it is characterized in that: lower portion of furnace body also comprises combustion-aid structure two, three times, two, three combustion-aid structures comprise accumulation of heat dead level, combustion air passage and a plurality of combustion-supporting through hole, combustion air passage is from heat exchange portion cold wind import one side, be communicated to the second combustion chamber and transition passage, combustion-supporting through hole is arranged on bottom, top and the sidewall of the second sidewall of combustion chamber and transition passage.
9. semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace according to claim 3, it is characterized in that: in heat exchange portion upper end one side, cold wind is sent into hollow sandwich by air blast, via final stage heat exchanger tube, adverse current is discharged after one-level heat exchanger tube becomes hot blast successively; Heat exchange portion end top arranges exhanst gas outlet, and exhanst gas outlet connects air-introduced machine import, and air-introduced machine outlet connects chimney.
10. according to semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace described in claim 1 to 9 any one, it is characterized in that: heat exchange portion the first top of combustion chamber is provided with wind air inlet pipe one time, and in air inlet pipe, be provided with stop valve, below stop valve, make a wind air inlet pipe communicate with chimney middle and lower part naturally emptying communicating pipe; Between the first combustion chamber and the second combustion chamber, be provided with the first grate, the second below, combustion chamber is provided with ash-falling chamber, between the second combustion chamber and ash-falling chamber, be provided with the second grate, the second bottom, combustion chamber be provided with for loose combustion residue to outward opening, ash-falling chamber has for outwards clearing up the ash hole of lime-ash, and the second grate aperture is less than the first grate aperture.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420254234.4U CN204006647U (en) | 2014-05-19 | 2014-05-19 | Semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420254234.4U CN204006647U (en) | 2014-05-19 | 2014-05-19 | Semi-coal gas downward-burning type tubulation multistage heat exchange smoke-dust-free hot-air furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104896729A (en) * | 2015-06-09 | 2015-09-09 | 王永强 | Various-fuel and environment-friendly boiler |
| CN106679174A (en) * | 2016-12-29 | 2017-05-17 | 广州市祈雅典锅炉有限公司 | High-temperature hot blast stove |
| CN107421118A (en) * | 2017-08-16 | 2017-12-01 | 广西中立源能源技术有限公司 | A kind of biomass thermal wind furnace in built-in combustion pond |
| CN109282491A (en) * | 2018-09-25 | 2019-01-29 | 湖南郴江电力设备安装运维有限公司 | A kind of air conditioner type biomass-burning hot-blast stove |
| CN110542207A (en) * | 2019-09-30 | 2019-12-06 | 合肥工业大学 | Rice husk type environment-friendly energy-saving suspension furnace |
| CN113883868A (en) * | 2021-09-27 | 2022-01-04 | 江苏羚羊水泥工程技术有限公司 | Marching type brown coal drying-machine |
-
2014
- 2014-05-19 CN CN201420254234.4U patent/CN204006647U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104896729A (en) * | 2015-06-09 | 2015-09-09 | 王永强 | Various-fuel and environment-friendly boiler |
| CN104896729B (en) * | 2015-06-09 | 2017-12-22 | 王永强 | Pluralities of fuel environment-protection boiler |
| CN106679174A (en) * | 2016-12-29 | 2017-05-17 | 广州市祈雅典锅炉有限公司 | High-temperature hot blast stove |
| CN106679174B (en) * | 2016-12-29 | 2023-09-08 | 广东工业大学 | High-temperature hot-air furnace |
| CN107421118A (en) * | 2017-08-16 | 2017-12-01 | 广西中立源能源技术有限公司 | A kind of biomass thermal wind furnace in built-in combustion pond |
| CN109282491A (en) * | 2018-09-25 | 2019-01-29 | 湖南郴江电力设备安装运维有限公司 | A kind of air conditioner type biomass-burning hot-blast stove |
| CN110542207A (en) * | 2019-09-30 | 2019-12-06 | 合肥工业大学 | Rice husk type environment-friendly energy-saving suspension furnace |
| CN113883868A (en) * | 2021-09-27 | 2022-01-04 | 江苏羚羊水泥工程技术有限公司 | Marching type brown coal drying-machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20170519 |
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| CF01 | Termination of patent right due to non-payment of annual fee |