CN115773630A - Vertical multi-section convection drying device - Google Patents
Vertical multi-section convection drying device Download PDFInfo
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- CN115773630A CN115773630A CN202211682881.0A CN202211682881A CN115773630A CN 115773630 A CN115773630 A CN 115773630A CN 202211682881 A CN202211682881 A CN 202211682881A CN 115773630 A CN115773630 A CN 115773630A
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- 238000001035 drying Methods 0.000 title claims abstract description 106
- 239000012159 carrier gas Substances 0.000 claims abstract description 93
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 101
- 239000003245 coal Substances 0.000 abstract description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000197 pyrolysis Methods 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract 1
- 239000003077 lignite Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 6
- 230000008676 import Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001599 direct drying Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a vertical multi-section convection drying device which sequentially comprises an inlet material sealing section, a first inlet air distribution section, a first convection drying section, a second air inlet air distribution section, a third convection drying section, a fourth air inlet air distribution section and an outlet material sealing section from top to bottom. The low-rank coal realizes four-section convection drying process in the convection drying device, the temperature gradually rises and the moisture in the coal continuously decreases. The drying device has simple structure and convenient operation, and can adopt nitrogen as carrier gas to realize the convective drying of the coal in four sections. The temperature and the moisture of the dried coal are uniform and stable through the mass and the heat transfer of the low-rank coal and the carrier gas in the drying device. In addition, the coal outlet temperature after drying is higher, so that the requirements of subsequent dry distillation treatment of the coal can be met.
Description
Technical Field
The invention belongs to the field of lignite drying, and particularly relates to a vertical multi-section convection drying device.
Background
The lignite gradually enters the visual field of people through quality grading and cascade efficient utilization, is parallel to related development plans on the national level, plays a certain role in expanding new coal clean and efficient utilization fields such as coking coal substitution, coal-to-oil, coal-to-chemical products, coal-to-natural gas and coal-to-hydrogen, and the like, and wins social acceptance and positive evaluation. However, because the moisture content of the lignite is high, the lignite needs to be pretreated in a drying mode before the lignite is subjected to dry distillation and upgrading utilization by the dry distillation device, so that the moisture of the coal as fired is reduced, the temperature of the coal as fired is increased, the energy gradient utilization and the moisture recovery of the lignite in the treatment process are realized, and the economy and the operability of the whole process device are improved.
Patent CN205102163U discloses a brown coal drying waste heat and water recovery system, raw coal enters a dryer through a coal feeder, moisture in the raw coal is vaporized after absorbing heat in the dryer, the raw coal is changed into dry coal, exhaust gas of the dryer enters a bag-type dust remover for dust removal, and separated coal powder and the dry coal enter a coal mill through a powder dropping pipe for grinding; and the exhaust gas at the outlet of the bag-type dust collector enters a condensing heat exchanger to recover moisture. The system is too complex, and the exhaust gas at the outlet of the bag-type dust collector has larger water content, so that the bag is easily blocked, and the system is obstructed.
Patent CN113280617A discloses "a low-rank pulverized coal drying device and a working method thereof", the method adopts a vertical drying structure and takes flue gas as a heat source. However, the direct drying of the high-temperature flue gas may cause over-drying and even destructive distillation decomposition of the lignite, and the cross-flow drying form of the high-temperature flue gas cannot ensure the uniformity of lignite drying.
Disclosure of Invention
The invention provides a vertical multi-section convection drying device, wherein four-section convection drying processes of low-rank coal are realized in the convection drying device, the temperature is gradually increased, and the moisture in the coal is continuously reduced. The drying device has simple structure and convenient operation, and can adopt nitrogen as carrier gas to realize the convective drying of the coal in four sections. The temperature and the moisture of the dried coal are uniform and stable through the mass and the heat transfer of the low-rank coal and the carrier gas in the drying device. In addition, the coal outlet temperature after drying is higher, so that the requirements of subsequent dry distillation treatment of the coal can be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vertical multi-section convection drying device comprises an inlet material sealing section, a first inlet gas distribution section, a first convection drying section, a second gas inlet gas distribution section, a third convection drying section, a fourth gas inlet gas distribution section and an outlet material sealing section from top to bottom in sequence, wherein the side walls of the first inlet gas distribution section, the second gas inlet gas distribution section, the third gas inlet gas distribution section and the fourth gas inlet gas distribution section are provided with carrier gas inlets, the first inlet gas distribution section exhausts gas to the first convection drying section and is dried with materials in a forward flow manner, the second gas inlet gas distribution section exhausts gas to the second convection drying section and is dried with materials in a reverse flow manner, the three-section air inlet and distribution section exhausts air to the three-section convection drying section and is dried with materials in a forward flow mode, the four-section air inlet and distribution section exhausts air to the four-section convection drying section and is dried with the materials in a reverse flow mode, the outer ring of the one-section convection drying section is provided with a second section comprehensive air outlet section, the second section comprehensive air outlet section is communicated with the bottom of the one-section convection drying section and the top of the two-section convection drying section respectively, the outer ring of the three-section convection drying section is provided with three or four section comprehensive air outlet sections, the three or four section comprehensive air outlet sections are communicated with the bottom of the three-section convection drying section and the top of the four-section convection drying section, and the side walls of the first section comprehensive air outlet section and the three or four section comprehensive air outlet sections are provided with carrier gas exhaust ports.
The structure of one section import gas distribution section, two-section import gas distribution section, three-section gas distribution section and four sections gas distribution section of admitting air is unanimous, including gas distribution section casing, carrier gas air duct, the carrier gas air duct transverse arrangement is in gas distribution section casing, and carrier gas air duct one end is equipped with the carrier gas air inlet, and the lower bottom surface of carrier gas air duct is equipped with the carrier gas outlet, and gas distribution section casing size length, width and height do respectively: 2m to 4m, 2m to 4m and 1m to 3m.
The carrier gas inlets are arranged on one side of the shell of the gas distribution section, and the number of the openings is 3-5; the center distance between every two carrier gas inlets is 600 mm-1200 mm.
The two-section comprehensive air outlet section comprises an annular inclined duct, an annular air storage duct and a carrier gas exhaust port, the annular air storage duct is sleeved outside the one-section convection drying section, the annular inclined duct is arranged at the lower end of the annular air storage duct, the bottom of the annular inclined duct is connected with the two-section convection drying section at the lower part of the annular inclined duct, and the side wall of the annular air storage duct is provided with the carrier gas exhaust port.
The three-four section comprehensive air outlet section comprises an annular chute, an annular air storage passage and a carrier gas exhaust port, the annular air storage passage is sleeved outside the three section convection drying section, the annular chute is arranged at the lower end of the annular air storage passage, the bottom of the annular chute is connected with the four section convection drying section at the lower part, and the side wall of the annular air storage passage is provided with the carrier gas exhaust port.
The angle of inclination of the annular chute is greater than 45 °.
Compared with the prior art, the invention has the beneficial effects that:
a vertical multi-section convection drying device is characterized in that four-section convection drying processes of low-rank coal are achieved in the convection drying device, the temperature is gradually increased, and the moisture in the coal is continuously reduced. The drying device has simple structure and convenient operation, and can adopt nitrogen as carrier gas to realize the convective drying of the coal in four sections. The temperature and the moisture of the dried coal are uniform and stable through the mass and the heat transfer of the low-rank coal and the carrier gas in the drying device. In addition, the coal outlet temperature after drying is higher, so that the requirements of subsequent dry distillation treatment of the coal can be met.
Fig. 1 is a front view of a vertical multi-stage convection drying apparatus.
Fig. 2 is a side view of a vertical multi-stage convection drying apparatus.
Fig. 3 is a detailed view of a section of air inlet and distribution section.
Fig. 4 is a detailed view of a two-stage integrated gas outlet section.
In fig. 1 and 2: 1. the device comprises an inlet gate 2, an inlet material sealing section 3, a first air inlet and distribution section 4, a first convection drying section 5, a second comprehensive air outlet section 6, a second convection drying section 7, a second air inlet and distribution section 8, a third air inlet and distribution section 9, a third convection drying section 10, a third and fourth comprehensive air outlet section 11, a fourth convection drying section 12, a fourth air inlet and distribution section 13, an outlet material sealing section 14 and an outlet material discharging gate;
in fig. 3: 31-gas distribution section shell, 32-carrier gas inlet, 33-carrier gas guide tube, 34-carrier gas outlet;
in fig. 4: 51-annular chute, 52-annular reservoir duct, 53-carrier gas exhaust.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the examples below. Various substitutions and alterations made according to the knowledge and ordinary skill in the art without departing from the technical idea of the invention are included in the scope of the invention.
Referring to fig. 1-4, a vertical multi-section convection drying device comprises an inlet material sealing section 2, a first inlet air distribution section 3, a first convection drying section 4, a second convection drying section 6, a second air inlet air distribution section 7, a third air inlet air distribution section 8, a third convection drying section 9, a fourth convection drying section 11, a fourth air inlet air distribution section 12 and an outlet material sealing section 13 from top to bottom in sequence, wherein the sections are connected by flanges, the upper end of the inlet material sealing section 2 is provided with an inlet gate 1, and the bottom of the outlet material sealing section 13 is provided with an outlet discharge gate 14. The side walls of the first-section inlet gas distribution section 3, the second-section inlet gas distribution section 7, the third-section inlet gas distribution section 9 and the fourth-section inlet gas distribution section 12 are provided with carrier gas inlets 32, the first-section inlet gas distribution section 3 exhausts gas to the first-section convection drying section 4 and is dried with materials in a forward flow mode, the second-section inlet gas distribution section 7 exhausts gas to the second-section convection drying section 6 and is dried with the materials in a reverse flow mode, the third-section inlet gas distribution section 8 exhausts gas to the third-section convection drying section 9 and is dried with the materials in a forward flow mode, the fourth-section inlet gas distribution section 12 exhausts gas to the fourth-section convection drying section 11 and is dried with the materials in a reverse flow mode, the outer ring of the first-section convection drying section 4 is provided with a second-section comprehensive gas outlet section 5, the second-section comprehensive gas outlet section 5 is respectively communicated with the bottom of the first-section convection drying section 4 and the top of the second-section convection drying section 6, the outer ring of the convection drying section 9 is provided with a third-fourth-section comprehensive gas outlet section 10, and the third-section-four-section comprehensive gas outlet section 5 is communicated with the top of the four-section convection drying section 11, and carrier gas outlets 53 are arranged on the side walls of the second-comprehensive gas outlet section 5 and the fourth-section 10.
The structure of one section import gas distribution section 3, two-section import gas distribution section 7, three-section gas distribution section 8 and four sections gas distribution section 12 that admits air is unanimous, including gas distribution section casing 31, carrier gas air duct 33 transversely arranges in gas distribution section casing 31, and carrier gas air duct 33 one end is equipped with carrier gas air inlet 32, and the lower bottom surface of carrier gas air duct 33 is equipped with carrier gas outlet 34, and gas distribution section casing 31 size is long, wide and high do respectively: 2m to 4m, 2m to 4m and 1m to 3m.
The carrier gas inlet 32 is arranged on one side of the gas distribution section shell 31, and the number of the openings is 3-5; the center distance between every two carrier gas inlets is 600 mm-1200 mm.
The two-section comprehensive air outlet section 5 comprises an annular inclined duct 51, an annular air storage duct 52 and a carrier gas exhaust port 53, the annular air storage duct 52 is sleeved outside the one-section convection drying section 4, the annular inclined duct 51 is arranged at the lower end of the annular air storage duct 52, the bottom of the annular inclined duct 51 is connected with the two-section convection drying section 6 at the lower part, and the carrier gas exhaust port 53 is arranged on the side wall of the annular air storage duct 51.
The three-four-section comprehensive air outlet section 10 comprises an annular chute 51, an annular air storage duct 52 and a carrier gas exhaust port 53, the annular air storage duct 52 is sleeved outside the three-section convection drying section 9, the annular chute 51 is arranged at the lower end of the annular air storage duct 52, the bottom of the annular chute 51 is connected with the four-section convection drying section 11 at the lower part, and the side wall of the annular air storage duct 52 is provided with the carrier gas exhaust port 53.
The inclination angle of the annular chute 51 is larger than 45 degrees, so that downstream blanking of low-rank coal is ensured.
The carrier gas of each section enters the gas inlet and distribution section of each section through the carrier gas inlet 32, passes through the carrier gas guide tube 33 and is discharged into the convection drying section of each section through the carrier gas outlet 34, and the convection drying process of the carrier gas and the coal is realized.
Each carrier gas inlet 32 is connected to a carrier gas duct 33. Each carrier gas guide tube 33 is connected with the two sides of the inner part of the gas distribution section shell 31 in a whole length. The cross section of the carrier gas air duct 33 is similar to a five-sided row, and 4-6 carrier gas air outlets 34 are formed at the bottom of the carrier gas air duct 33. The carrier gas outlet 34 is smaller in size closer to the carrier gas inlet 32; the carrier gas outlet 34 is larger in size further from the carrier gas inlet 32.
One section of convection drying section and three sections of convection drying sections, and the carrier gas exchanges heat with the coal in a downstream mode.
And the carrier gas and the coal perform countercurrent heat exchange in the two-section convection drying section and the four-section convection drying section.
The structure of the first-second section comprehensive air outlet section 5 and the structure of the third-fourth section comprehensive air outlet section 10 adopt the same structure. Each section of the integrated outlet section is divided into an annular chute 51, an annular gas storage duct 52 and a carrier gas outlet 53.
The annular inclined duct 51 collects the carrier gas and the carried vapor discharged from the convection drying section, the annular inclined duct 51 is communicated with an annular gas storage duct 52, and the annular gas storage duct 52 is provided with a carrier gas exhaust port 53.
The annular width of the carrier gas circulation of the annular chute and the annular gas storage channel is more than 500mm, the carrier gas circulation speed is ensured to be less than 2.5m/s, and the fluidization overflow of low-order coal particles and dust is reduced.
The specific implementation mode is as follows:
taking a section of gas inlet distribution section 3 as a row, the carrier gas enters the section of gas inlet distribution section 3 from the carrier gas inlet 32, passes through the carrier gas air duct 33 and then is discharged into a section of convection drying section 4 from the carrier gas outlet 34, and the convection drying process of the carrier gas and the coal is realized.
The length, width and height of the shell 31 of the gas distribution section are respectively as follows: 3m, 3m and 1m.
A section of gas inlet and distribution section 3 is taken as a row, carrier gas inlets 32 are arranged on one side of a gas distribution section shell 31, and the number of the openings is 3; the distance between the centers of every two carrier gas inlets 32 is 900mmmm.
Each carrier gas inlet 32 is connected with a carrier gas guide pipe 33 by taking a section of the gas inlet distribution section 3 as a row. Each carrier gas guide tube 33 is connected with the two sides of the inner part of the gas distribution section shell 31 in a whole length. The cross section of the carrier gas air duct 33 is similar to a five-sided row, and 4-6 carrier gas air outlets 34 are formed at the bottom of the carrier gas air duct 33. The carrier gas outlet 34 is smaller in size closer to the carrier gas inlet 32; the carrier gas outlet 34 is larger in size further from the carrier gas inlet 32.
Taking the second-stage integrated air outlet section 5 as an example, the annular chute 51 collects the carrier gas and the carried vapor discharged from the first-stage convection drying section 4 and the second-stage convection drying section 6, the annular chute 51 is communicated with the annular air storage duct 52, and the annular air storage duct 52 is provided with a carrier gas exhaust port 53.
Taking the second-stage comprehensive gas outlet section 5 as an example, the annular width of the carrier gas circulation of the annular chute 51 and the annular gas storage channel 52 is 550mm, and the carrier gas circulation speed is 2.2m/s, so that the fluidization overflow of low-order coal particles and dust is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A vertical multi-section convection drying device is characterized by comprising an inlet material sealing section, a first inlet gas distribution section, a first convection drying section, a second gas inlet gas distribution section, a third convection drying section, a fourth gas inlet gas distribution section and an outlet material sealing section from top to bottom in sequence, wherein carrier gas inlets are arranged on the side walls of the first inlet gas distribution section, the second gas inlet gas distribution section, the third gas inlet gas distribution section and the fourth gas inlet gas distribution section, the first inlet gas distribution section exhausts to the first convection drying section and is dried with materials in a concurrent mode, the second gas inlet gas distribution section exhausts to the second convection drying section and is dried with materials in a concurrent mode, the fourth gas inlet gas distribution section exhausts to the fourth convection drying section and is dried with materials in a concurrent mode, a second comprehensive gas outlet section is arranged on the side wall of the second gas distribution section, the second comprehensive gas outlet section is communicated with the bottom of the first convection drying section and the top of the second convection drying section, an outer ring is arranged on the bottom of the second comprehensive gas outlet drying section, and an outer ring is communicated with the bottom of the third convection drying section and the top of the four sections, and an outer ring is arranged on the outer ring.
2. The vertical multi-section convection drying device according to claim 1, wherein the structure of the first inlet gas distribution section, the second inlet gas distribution section, the third gas inlet gas distribution section and the fourth gas inlet gas distribution section is consistent, the vertical multi-section convection drying device comprises a gas distribution section shell and a carrier gas air duct, the carrier gas air duct is transversely arranged in the gas distribution section shell, one end of the carrier gas air duct is provided with a carrier gas inlet, the lower bottom surface of the carrier gas air duct is provided with a carrier gas outlet, and the length, width and height of the gas distribution section shell are respectively: 2m to 4m, 2m to 4m and 1m to 3m.
3. The vertical multi-stage convection drying device according to claim 2, wherein the carrier gas inlets are arranged on one side of the gas distribution stage shell, and the number of the openings is 3-5; the center distance between every two carrier gas inlets is 600 mm-1200 mm.
4. The vertical multi-stage convection drying device according to claim 1, wherein the two-stage comprehensive air outlet section comprises an annular chute, an annular air storage duct and a carrier gas exhaust port, the annular air storage duct is sleeved outside the one-stage convection drying section, the annular chute is arranged at the lower end of the annular air storage duct, the bottom of the annular chute is connected with the two-stage convection drying section at the lower part, and the carrier gas exhaust port is arranged on the side wall of the annular air storage duct.
5. The vertical multi-stage convection drying device according to claim 1, wherein the three or four-stage comprehensive air outlet section comprises an annular chute, an annular air storage duct and a carrier gas exhaust port, the annular air storage duct is sleeved outside the three or four-stage convection drying section, the annular chute is arranged at the lower end of the annular air storage duct, the bottom of the annular chute is connected with the four or four-stage convection drying section at the lower part, and the side wall of the annular air storage duct is provided with the carrier gas exhaust port.
6. A vertical multi-stage convective drying apparatus according to claim 4 or 5, wherein the angle of inclination of the annular chute is greater than 45 °.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211682881.0A CN115773630A (en) | 2022-12-27 | 2022-12-27 | Vertical multi-section convection drying device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211682881.0A CN115773630A (en) | 2022-12-27 | 2022-12-27 | Vertical multi-section convection drying device |
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| CN202211682881.0A Pending CN115773630A (en) | 2022-12-27 | 2022-12-27 | Vertical multi-section convection drying device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE319128B (en) * | 1968-09-24 | 1969-12-22 | Svenska Flaektfabriken Ab | |
| CN85203488U (en) * | 1985-08-16 | 1986-06-18 | 辽宁省粮食科研所 | Tower-form grain drier without ventilating box |
| CN101712882A (en) * | 2009-12-04 | 2010-05-26 | 北京国电富通科技发展有限责任公司 | Heat exchange structure used for coal drying treatment |
| CN101762145A (en) * | 2009-10-12 | 2010-06-30 | 郑州拉姆顿清洁能源工程技术有限公司 | Coal anaerobic drying device and drying system |
| CN203629247U (en) * | 2013-06-15 | 2014-06-04 | 宁波互联聚能环保技术有限公司 | Multi-gust parallel transverse flow air drying machine |
| CN113280617A (en) * | 2021-06-08 | 2021-08-20 | 中冶焦耐(大连)工程技术有限公司 | Low-order pulverized coal drying device and working method thereof |
| CN115179458A (en) * | 2022-06-29 | 2022-10-14 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen gas circulation degree of depth takes off and waves drying tower |
| CN219454584U (en) * | 2022-12-27 | 2023-08-01 | 中冶焦耐(大连)工程技术有限公司 | Vertical multistage convection drying device |
-
2022
- 2022-12-27 CN CN202211682881.0A patent/CN115773630A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE319128B (en) * | 1968-09-24 | 1969-12-22 | Svenska Flaektfabriken Ab | |
| CN85203488U (en) * | 1985-08-16 | 1986-06-18 | 辽宁省粮食科研所 | Tower-form grain drier without ventilating box |
| CN101762145A (en) * | 2009-10-12 | 2010-06-30 | 郑州拉姆顿清洁能源工程技术有限公司 | Coal anaerobic drying device and drying system |
| CN101712882A (en) * | 2009-12-04 | 2010-05-26 | 北京国电富通科技发展有限责任公司 | Heat exchange structure used for coal drying treatment |
| CN203629247U (en) * | 2013-06-15 | 2014-06-04 | 宁波互联聚能环保技术有限公司 | Multi-gust parallel transverse flow air drying machine |
| CN113280617A (en) * | 2021-06-08 | 2021-08-20 | 中冶焦耐(大连)工程技术有限公司 | Low-order pulverized coal drying device and working method thereof |
| CN115179458A (en) * | 2022-06-29 | 2022-10-14 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen gas circulation degree of depth takes off and waves drying tower |
| CN219454584U (en) * | 2022-12-27 | 2023-08-01 | 中冶焦耐(大连)工程技术有限公司 | Vertical multistage convection drying device |
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