CN212205563U - Heating device of grain drying tower - Google Patents
Heating device of grain drying tower Download PDFInfo
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- CN212205563U CN212205563U CN202020658005.4U CN202020658005U CN212205563U CN 212205563 U CN212205563 U CN 212205563U CN 202020658005 U CN202020658005 U CN 202020658005U CN 212205563 U CN212205563 U CN 212205563U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model relates to a heating device of grain drying tower relates to grain stoving technical field, has solved the technical problem that the grain drying tower heating device among the prior art discharges not up to standard. The technical characteristics include that the biomass hot blast stove comprises a feeder, the discharge end of the feeder is communicated with a feeding bin of the biomass hot blast stove, a fire outlet of the biomass hot blast stove is communicated with a smoke inlet of a heat exchanger, a smoke outlet of the heat exchanger is communicated with an inlet end of a smoke waste heat recoverer, high-temperature smoke enters the smoke waste heat recoverer for further heat exchange after heat exchange, part of the smoke is recovered to a boiler distribution chamber through a smoke recovery pipe, hot smoke enters the biomass hot blast stove through the boiler distribution chamber, and part of the smoke enters a dust remover, is purified and dedusted and then is discharged to the outside through a chimney. Has the beneficial effects of energy conservation and emission reduction.
Description
Technical Field
The utility model relates to a grain stoving technical field, in particular to heating device of grain drying tower.
Background
At present, the grain drying tower uses coal as a heat source, the coal is fossil energy and is non-renewable, the environmental pollution is serious, the biomass fuel is renewable clean energy, the clean biomass energy is used for replacing the coal fuel with serious pollution, and the problem of the environmental pollution caused by the fire coal of the grain drying tower is solved. The pollution of coal to the environment is very serious, and the utilization of clean energy is widely popularized along with the increase of the environmental remediation strength of the country. The change of electricity into gas and the change of biomass into biomass become the pets of the times. In contrast, biomass has irreplaceable advantages in terms of economy and resource.
The mode of changing the biomass energy of the grain drying tower is roughly two: one is to use the original heat exchanger to reform the old coal-fired furnace into the biomass furnace; the other is to use a chain grate of a coal burning technology to manufacture a new biomass hot blast stove, but still use the original heat exchanger; the discharge modes of the two modes do not meet the standards of energy conservation and emission reduction, so that a new heating device of the grain drying tower is imperative to manufacture a new biomass furnace.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the technical problem that the grain drying tower heating device among the prior art discharges not up to standard, provide a heating device of grain drying tower.
In order to solve the technical problem, the technical scheme of the utility model is specifically as follows:
a heating apparatus of a grain drying tower, comprising:
the device comprises a feeding machine, wherein the discharge end of the feeding machine is communicated with a feeding bin of a biomass hot blast stove, a fire outlet of the biomass hot blast stove is communicated with a smoke inlet of a heat exchanger, a smoke outlet of the heat exchanger is communicated with an inlet end of a smoke waste heat recoverer, the smoke temperature at the smoke outlet of the heat exchanger is between 200 DEG and 250 DEG, high-temperature smoke enters the smoke waste heat recoverer for further heat exchange after heat exchange, part of the smoke is recovered into a boiler distribution chamber through a smoke recovery pipe, hot smoke enters the biomass hot blast stove through the boiler distribution chamber, and part of the smoke enters a dust remover, is purified and dedusted and then is discharged outdoors through a chimney;
external air enters an air heat-preservation cavity on the outer wall of the biomass hot blast stove through an air inlet pipe of the preheater, heated air enters a gas distribution chamber of the boiler and is mixed with flue gas to form oxygen-poor air, the oxygen-poor air enters a hearth of the biomass hot blast stove through a fan, the oxygen-poor air forms oxygen-poor low-nitrogen combustion on biomass fuel in the biomass hot blast stove, and the emission of nitrogen oxides generated by the combustion is lower than 200mg/m 3;
the outside space enters the heat exchanger through the air inlet pipe of the heat exchanger, the heated air enters the air distribution chamber of the drying tower from the air outlet pipe of the heat exchanger, and the hot air in the air distribution chamber of the drying tower is sent into the drying tower by the fan of the drying tower to dry grains;
the outside air enters the flue gas waste heat recoverer through an air inlet pipe of the flue gas waste heat recoverer, the outlet temperature of the flue gas waste heat recoverer is 85-100 ℃, and the outside air is changed into hot air through heat exchange and then enters an air distribution chamber of the drying tower through a pipeline;
wherein, living beings hot-blast furnace includes:
a hearth;
the feeding bin is internally provided with a first auger which is communicated with the feeding bin and the hearth, and the biomass fuel enters the hearth through the first auger;
wherein, the bottom of the hearth is also provided with a primary air supply fan which feeds oxygen-poor gas mixed by the recycled flue gas and the hot air into the hearth;
a heat exchanger, comprising:
the air inlet cavity is arranged on one side in the heat exchanger and is communicated with the outside air;
the flue gas heat exchange cavity is arranged in the middle of the heat exchanger, a plurality of heat exchange tubes are welded in the flue gas heat exchange cavity, and one ends of the heat exchange tubes are communicated with the air inlet cavity;
the first air exchange cavity is arranged on the other side in the heat exchanger and communicated with the other end of the heat exchange tube, the first air exchange cavity is communicated with the second air exchange cavity through the heat exchange tube, and the second air exchange cavity is communicated with an air outlet tube of the heat exchanger;
the gas inlet cavity, the flue gas heat exchange cavity, the first gas exchange cavity and the second gas exchange cavity are separated by partition plates and are arranged independently;
the heat exchange tube at the front end of the flue gas heat exchange cavity is provided with a U-shaped flue gas channel, the bottom of the U-shaped flue gas channel is provided with a second auger used for conveying dust in the flue gas to the outside of the heat exchanger, hot flue gas enters from the front end of the flue gas heat exchange cavity and enters the flue gas heat exchange cavity through the U-shaped flue gas channel to heat the outer wall of the heat exchange tube, and the dust in the flue gas falls into the second auger.
Further, the feed bin includes:
the first auger is fixedly arranged in the feeding bin, and a discharge port of the first auger is communicated with the hearth;
the motor is fixedly arranged in the feeding bin and is connected with the first auger through a belt;
the feed inlet is arranged above the feeding bin and communicated with the first auger.
Further, the one end top of furnace includes for going out the burner in the furnace:
the grate is composed of a plurality of steel pipes with vent holes, a motor drives each steel pipe to rotate in the same direction, the grate is close to the wall of the hearth and is positioned below a discharge hole of the first auger, and a main combustion area is arranged above the grate;
the slag extractor is arranged at the other end of the grate and is positioned below the grate, and the slag extractor is used for receiving the burnt slag;
the air blocking pipe is formed by a plurality of steel pipes in parallel, the air blocking pipe is arranged above the fire grate and is fixedly connected with the interior of the hearth, one end of the air blocking pipe is arranged below the fire outlet, and the other end of the air blocking pipe, the fire grate and the hearth top plate form a U-shaped flame channel;
wherein, the upper part of one end of the wind shielding pipe far away from the fire outlet is a reburning area, the upper part of one end of the wind shielding pipe near the fire outlet is a burnout area, and at the moment, the burnout rate of the fuel is 95 percent;
the biomass fuel preheating device comprises an air preheating air pipe, a biomass hot blast stove and a fan, wherein the air preheating air pipe is a steel pipe with a plurality of ventilation holes and is tightly arranged, the air preheating air pipe enters an air heat preservation cavity on the outer wall of the biomass hot blast stove, heated air enters a boiler air distribution chamber and is mixed with flue gas to form oxygen-deficient air, the oxygen-deficient air enters a hearth of the biomass hot blast stove through the fan, and the oxygen-deficient air forms oxygen-deficient low-nitrogen combustion on biomass fuel in the biomass hot blast stove;
the primary air supply fan is communicated with the flue gas recovery pipe and arranged below the grate, and mixes preheated air and recovered flue gas to provide oxygen-deficient combustion air for fuel combustion;
the secondary air supply fan is arranged on one side, close to the feeding bin, of the U-shaped flame channel and blows air in the air preheating air pipe into the hearth;
and the tertiary air supply fan is arranged on one side of the U-shaped flame channel close to the fire outlet.
Further, the flue gas heat exchange cavity includes:
the first air baffle is fixedly arranged at the bottom of the flue gas heat exchange cavity, and the interior of the flue gas heat exchange cavity is divided into a first heat exchange space and a second heat exchange space by the first air baffle;
the smoke inlet is positioned in the first heat exchange space and arranged at the front end of the smoke heat exchange cavity, the smoke inlet is communicated with a fire outlet of a hearth of the biomass hot blast stove in the previous process, and hot smoke enters the first heat exchange space from the smoke inlet;
the smoke outlet is positioned in the second heat exchange space and arranged at the rear end of the smoke heat exchange cavity and communicated with the smoke waste heat recoverer;
the first high-temperature-resistant air pipe bank is arranged in the first heat exchange space and right in front of the smoke inlet and used for blocking smoke from continuing to move forwards, a second high-temperature-resistant air pipe bank and a third high-temperature-resistant air pipe bank are arranged below two sides of the first high-temperature-resistant air pipe bank respectively, the second high-temperature-resistant air pipe bank is arranged on the inner wall below the smoke inlet of the smoke heat exchange cavity, the third high-temperature-resistant air pipe bank is arranged above the first wind shield and is attached to the upper surface of the first wind shield, and the first high-temperature-resistant air pipe bank, the second high-temperature-resistant air pipe bank and the third high-temperature-resistant air pipe bank form a U-shaped smoke passing channel;
a second packing auger for conveying dust in the flue gas to the outside of the heat exchanger is arranged below the space between the second high-temperature-resistant air pipe row and the third high-temperature-resistant air pipe row, and a feed inlet of the second packing auger is communicated with the lower parts of the second high-temperature-resistant air pipe row and the third high-temperature-resistant air pipe row;
the heat exchange tubes are divided into a first heat exchange tube, a second heat exchange tube and heat exchange tubes which form a first high-temperature-resistant air pipe bank, a second high-temperature-resistant air pipe bank and a third high-temperature-resistant air pipe bank.
Furthermore, the first high-temperature-resistant air pipe bank, the second high-temperature-resistant air pipe bank and the third high-temperature-resistant air pipe bank are formed by closely arranging and combining a plurality of high-temperature-resistant heat exchange pipes.
Furthermore, a second air baffle for preventing the smoke from circulating from the bottom is arranged in the second heat exchange space, the second air baffle divides the second heat exchange space into a first heat exchange cavity and a second heat exchange cavity, and ash removing openings are formed in the bottoms of the first heat exchange cavity and the second heat exchange cavity.
Furthermore, a second heat exchange tube for preventing the temperature of the top wall of the heat exchanger from being too high is arranged on the inner side of the top wall of the flue gas heat exchange cavity, the second heat exchange tube is tightly arranged on the inner side of the top wall of the heat exchanger, and heat insulation cotton is further arranged on the outer side of the top wall of the heat exchanger;
the second heat exchange tube in the first heat exchange space is a high-temperature-resistant steel tube.
The utility model discloses following beneficial effect has:
the utility model discloses a heating device of grain drying tower, through setting up living beings hot-blast furnace and heat exchanger, the fuel burn-off rate is high, and nitrogen oxide discharges and is less than 200mg/m3, has reached energy saving and emission reduction's standard; the biomass hot blast stove is characterized in that the auger is arranged in the feeding bin, so that biomass fuel enters the hearth through the auger to be combusted, and the auger is filled with the biomass fuel to seal the hearth, so that air in the feeding bin is prevented from entering the hearth, and the technical problems that the air leakage at the feeding port of the original equipment is serious, and the content of nitrogen oxides in flue gas is high due to excessive air in the hearth are solved; the auger can convey the biomass fuel into the hearth uniformly and then burn the biomass fuel, so that the technical problems of uneven feeding and serious coking of the original equipment are solved; by arranging the air blocking pipe, the secondary air supply fan and the tertiary air supply fan, and the position of the secondary air supply fan is a certain distance away from the main combustion area, the biomass fuel can be combusted more fully, the reductive thermal decomposition of nitrogen oxides generated in the main combustion area is facilitated, and the generation of the nitrogen oxides is limited; the primary air supply fan can feed the oxygen-deficient gas mixed by the recovered flue gas and the hot air into the hearth to perform oxygen-deficient combustion on biomass fuel, so that the generation of nitrogen oxides is limited and reduced; the biomass hot blast stove can ensure that the biomass fuel is more fully combusted, reduces the emission of nitrogen oxides and is more environment-friendly; the heat exchanger is provided with a first high-temperature resistant air pipe bank, a second high-temperature resistant air pipe bank and a third high-temperature resistant air pipe bank to form a U-shaped smoke channel, so that a large amount of smoke can fall into the auger, a large amount of smoke dust is automatically discharged out of the heat exchanger through the auger, only a small amount of smoke dust is left to enter the second heat exchange space, the automatic smoke dust cleaning is realized, the smoke dust removing efficiency is improved, the frequency of cleaning the heat exchanger is reduced, the labor intensity of workers is reduced, meanwhile, high-temperature smoke gas enters the smoke gas heat exchange cavity to heat the outer wall of the heat exchange pipe, thereby heating the air in the heat exchange tube, abandoning the thought of the prior hot smoke in the heat exchange tube, therefore, the inner wall of the heat exchange tube is not blocked by smoke dust, tar and the like or obstructs the gas circulation of the heat exchange tube, and a high-power smoke-inducing fan is not needed for inducing air to the heat exchanger tube.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural view of a heating device of a grain drying tower of the present invention;
fig. 2 is a schematic structural view of a biomass hot-blast stove of a heating device of a grain drying tower of the utility model;
fig. 3 is a schematic view of a side-looking structure in a furnace chamber of a biomass hot-blast stove of a heating device of a grain drying tower of the utility model;
fig. 4 is a schematic structural view of a heat exchanger of a heating device of a grain drying tower according to the present invention;
fig. 5 is a schematic view of the inside of the heat exchanger of the heat supply device of the grain drying tower according to the present invention.
The reference numerals in the figures denote:
1. a feeder; 2. a biomass hot blast stove; 201. a feeding bin; 202. a motor; 203. a first auger; 204. A hearth; 205. an air blocking pipe; 206. a fire outlet; 207. a primary air supply fan; 208. a grate; 209. a slag extractor; 210. a secondary air supply fan; 211. air preheating air pipes; 212. a tertiary air supply fan; 213. a primary combustion zone; 214. a reburning zone; 215. a burnout zone; 3. a heat exchanger; 301. a smoke inlet; 302. heat preservation cotton; 303. A second heat exchange tube; 304. the first high-temperature-resistant air duct bank; 305. a first heat exchange tube; 306. a second auger; 307. cleaning the ash hole; 308. a second wind deflector; 309. a first heat exchange chamber; 310. a second heat exchange chamber; 311. A smoke outlet; 312. a first windshield; 313. a first heat exchange space; 314. the second high-temperature-resistant air pipe bank; 315. a third high-temperature-resistant air duct bank; 316. an air inlet cavity; 317. a second air exchange cavity; 318. a first air exchange cavity; 319. a partition plate; 320. a flue gas heat exchange cavity; 4. a flue gas waste heat recoverer; 5. a dust remover; 6. a chimney; 7. a boiler gas distribution chamber; 8. an air inlet pipe of the heat exchanger; 9. an air inlet pipe of the preheater; 10. an air distribution chamber of the drying tower; 11. a drying tower fan; 12. an air outlet pipe of the heat exchanger; 13. flue gas waste heat recovery air-supply line.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-5, a heating apparatus for a grain drying tower includes:
the device comprises a feeder 1, wherein the discharge end of the feeder 1 is communicated with a feeding bin 201 of a biomass hot blast stove 2, a fire outlet 206 of the biomass hot blast stove 2 is communicated with a smoke inlet 301 of a heat exchanger 3, a smoke outlet 311 of the heat exchanger 3 is communicated with an inlet end of a smoke waste heat recoverer 4, the smoke temperature at the smoke outlet 311 of the heat exchanger 3 is between 200 degrees and 250 degrees, high-temperature smoke enters the smoke waste heat recoverer 4 for further heat exchange after heat exchange, part of the smoke is recovered to a boiler gas distribution chamber 7 through a smoke recovery pipe, hot smoke enters the biomass hot blast stove 2 through the boiler gas distribution chamber 7, and part of the smoke enters a dust remover 5 and is discharged outdoors through a chimney 6 after being purified and dedusted;
the external air enters an outer wall air heat preservation cavity of the biomass hot blast stove 2 through a preheater air inlet pipe 9, the biomass hot blast stove 2 is substantially of a sleeve-like structure, namely, the outer wall of the biomass hot blast stove 2 is also provided with an air heat preservation cavity, heated air enters a boiler air distribution chamber 7 and is mixed with flue gas to form oxygen-deficient air, the oxygen-deficient air enters a hearth of the biomass hot blast stove 2 through a fan, the oxygen-deficient air forms oxygen-deficient low-nitrogen combustion on biomass fuel in the biomass hot blast stove 2, and the oxygen content of the oxygen-deficient combustion is lower than 21%; the oxygen-poor low-nitrogen combustion is that the nitrogen oxides generated by the combustion of the biomass fuel are low, and the emission of the nitrogen oxides generated by the combustion is lower than 200mg/m 3;
the external space enters the heat exchanger 3 through the heat exchanger air inlet pipe 8, the heated air enters the drying tower air distribution chamber 10 from the heat exchanger air outlet pipe 12, and the drying tower fan 11 sends the hot air in the drying tower air distribution chamber 10 into the drying tower to dry the grains;
the outside air enters the flue gas waste heat recoverer 4 through the flue gas waste heat recoverer air inlet pipe 13, the outlet temperature of the flue gas waste heat recoverer 13 is 85-100 degrees, and the outside air is changed into hot air through heat exchange and then enters the drying tower air distribution chamber 10 through a pipeline;
wherein, living beings hot-blast furnace 2 includes:
a hearth 204;
a feeding bin 201, wherein a first auger 203 is arranged in the feeding bin 201, the first auger 203 is communicated with the feeding bin 201 and a hearth 204, and biomass fuel enters the hearth 204 through the first auger 203;
wherein, the bottom of the hearth 204 is also provided with a primary air supply fan 207 which feeds oxygen-poor gas mixed by the recycled flue gas and the hot air into the hearth;
a heat exchanger, comprising:
the air inlet cavity 316 is arranged on one side inside the heat exchanger and is communicated with the outside air;
the flue gas heat exchange cavity 320 is arranged in the middle of the heat exchanger, a plurality of heat exchange tubes are welded in the flue gas heat exchange cavity 320, and one ends of the heat exchange tubes are communicated with the air inlet cavity 316;
the first ventilation cavity 318 is arranged at the other side in the heat exchanger, the first ventilation cavity 318 is communicated with the other end of the heat exchange tube, the first ventilation cavity 318 is communicated with the second ventilation cavity 317 through the heat exchange tube, and the second ventilation cavity 317 is communicated with the drying tower air distribution chamber 10 through the heat exchanger air outlet tube 12;
the air inlet cavity 316 and the second ventilation cavity 317 are arranged on the same side, and the air inlet cavity 316, the flue gas heat exchange cavity 320, the first ventilation cavity 318 and the second ventilation cavity 317 are separated by a partition plate 319 and are arranged independently;
the heat exchange tube at the front end of the flue gas heat exchange cavity 320 is provided with a U-shaped flue gas channel, the bottom of the U-shaped flue gas channel is provided with a second auger 306 for conveying dust in the flue gas to the outside of the heat exchanger, hot flue gas enters from the front end of the flue gas heat exchange cavity 320 and enters the flue gas heat exchange cavity 320 through the U-shaped flue gas channel to heat the outer wall of the heat exchange tube, and the dust of the flue gas falls into the second auger 306.
The working principle is as follows: the biomass fuel enters the hearth of a biomass hot blast stove 2 through a feeder 1 to be combusted; high-temperature flue gas generated by combustion of the biomass hot blast stove 2 enters the heat exchanger 3 to heat the outer wall of a heat exchanger tube of the heat exchanger 3, the high-temperature flue gas enters the flue gas waste heat recoverer 4 after heat exchange for further heat exchange, one part of the flue gas is recovered into the boiler gas distribution chamber 7, and the other part of the flue gas enters the dust remover 5 to be purified and dedusted and then is discharged outdoors through the chimney 6.
Cold air enters the air heat preservation cavity on the outer wall of the biomass hot blast stove 2 through the air inlet pipe 9 of the preheater, heated air enters the boiler air distribution chamber 7 to be mixed with part of flue gas to form oxygen-poor air, and the oxygen-poor air enters the hearth through the fan air distribution fan to form oxygen-poor low-nitrogen combustion. In the environment of oxygen-deficient combustion, the nitrogen oxides generated by the biomass fuel are less, the emission of the nitrogen oxides is lower than 200mg/m3, and the environment requirement is met.
Cold air enters the heat exchanger 3 through the air inlet pipe 8 of the heat exchanger, heat exchange is completed through walking in the heat exchanger pipe, the cold air enters the air distribution chamber 10 of the drying tower through the air outlet pipe 12 of the heat exchanger, and hot air in the air distribution chamber 10 of the drying tower is sent into the grain drying tower through the grain drying tower fan 11 to dry grains.
Cold air enters the flue gas waste heat recycling device 4 through the air inlet pipe 13 of the flue gas waste heat recycling device, the waste heat recycling rate is improved, fuel is saved, and the cold air enters the air distribution chamber 10 of the drying tower after being converted into hot air through heat exchange.
After entering the feeding bin 201, the biomass fuel is conveyed to the hearth 204 through the first auger 203 for combustion, and because the biomass fuel enters and fills the inside of the first auger 203 and the first auger 203 has an isolation effect, external air cannot enter the hearth 204 through the feeding bin 201, so that the technical problems that the air leakage at the feeding port of the original equipment is serious, and the content of nitrogen oxides in flue gas is high due to excessive air inside the hearth are solved; the first auger 203 can convey the biomass fuel into the hearth uniformly and then burn the biomass fuel, so that the technical problems of uneven feeding and serious coking of the original equipment are solved; partial flue gas is retrieved to the flue gas recoverer, and once gives in air blower 7 sends into furnace 204 with partial flue gas that the flue gas recoverer was retrieved through the recovery pipeline, can make biomass fuel carry out the oxygen deficiency burning like this, and biomass fuel burns under this kind of environment, can effectively reduce nitrogen oxide's production, makes whole burning environmental protection more.
Hot flue gas generated by the biomass hot blast stove 2 enters the flue gas heat exchange cavity 320 from the front end of the flue gas heat exchange cavity 320 and heats the outer wall of a heat exchange pipe in the flue gas heat exchange cavity 320, the second air exchange cavity 317 is communicated with the drying tower air distribution cavity 10 through a heat exchanger air outlet pipe 12, and hot air in the drying tower air distribution cavity 10 is sent into the drying tower by the drying tower fan 11 to dry grains, so that the external air enters the first air exchange cavity 318 from the air inlet cavity 316 through the heat exchange pipe and then enters the grain drying tower from the second air exchange cavity 317; the heat exchange tube at the front end of the flue gas heat exchange cavity 320 is provided with a U-shaped flue gas channel, the bottom of the U-shaped flue gas channel is provided with a second packing auger 306 for conveying dust in flue gas to the outside of the heat exchanger, as shown in fig. 4, it can be understood that after hot flue gas passes through the U-shaped flue gas channel, a large amount of smoke dust falls into the second packing auger 306 below, and the dust in the flue gas is conveyed to the outside of the heat exchanger 3 through the second packing auger 306; the smoke dust is automatically cleaned, the smoke dust removing efficiency is improved, the frequency of cleaning the heat exchanger is reduced, the labor intensity of workers is reduced, meanwhile, high-temperature smoke enters the smoke heat exchange cavity 320 to heat the outer wall of the heat exchange pipe, air in the heat exchange pipe is further heated, the previous idea that hot smoke leaves the heat exchange pipe is abandoned, the inner wall of the heat exchange pipe cannot be blocked by smoke dust, tar and the like or block the gas circulation of the heat exchange pipe, meanwhile, the space between the heat exchange pipes is large, the circulation of the smoke is facilitated, a smoke guiding fan with high power is not needed to guide the smoke heat exchange cavity, and the energy consumption is reduced; meanwhile, because the power of the smoke-inducing fan is low, the smoke-inducing acting force generated on the hearth of the biomass hot blast stove in the previous process is small, the smoke-inducing acting force is small, the air in the hearth of the biomass hot blast stove in the previous process is less, the oxygen is less, the nitrogen oxide generated in the hearth of the biomass hot blast stove in the previous process is less, and the emission of the nitrogen oxide is environment-friendly.
the first auger 203 is fixedly arranged in the feeding bin 201, and a discharge port of the first auger 203 is communicated with the hearth 204;
the motor 202 is fixedly arranged in the feeding bin 201 and is connected with the first auger 203 through a belt;
the feeding hole is arranged above the feeding bin 201 and communicated with the first auger 203.
The working principle is as follows: biomass fuel enters the feeding bin 201 through the feeding hole, the motor 202 is started, the motor 202 drives the first auger 203 to operate, so that the biomass fuel is conveyed to the hearth 204 by the first auger 203 and then is combusted, and because the biomass fuel enters and fills the inside of the first auger 203 and the isolation effect of the first auger 203, outside air cannot enter the hearth 204 through the feeding bin 1, so that the technical problems that the content of nitrogen oxides in flue gas is high due to serious air leakage at the feeding hole of the original equipment and excessive air in the drying tower are solved; the biomass fuel can be uniformly conveyed into the hearth 204 by the first auger 203 and then combusted, so that the technical problems of uneven feeding and serious coking of the original equipment are solved.
Above one end of the furnace 204 is a fire outlet 206, and the furnace 204 includes:
the grate 208 is composed of a plurality of high-temperature resistant cast iron pipes with vent holes, a motor drives each steel pipe to rotate in the same direction, the grate 208 is close to the wall of the hearth 204 and is positioned below a discharge hole of the first auger 203, and a main combustion area 213 is arranged above the grate 208;
the slag extractor 209, the slag extractor 209 is set up in another end of the fire grate 208, and locate under the fire grate 208, the slag extractor 209 is used for receiving the slag burnt out;
the fire grate comprises an air blocking pipe 205 and a wind blocking pipe 205, wherein the wind blocking pipe 205 is formed by arranging a plurality of high-temperature-resistant stainless steel pipes side by side, the wind blocking pipe 205 is arranged above the fire grate 208, the wind blocking pipe 205 is fixedly connected with the inside of the hearth 204, one end of the wind blocking pipe 205 is arranged below a fire outlet 206, and the other end of the wind blocking pipe 205, the fire grate 208 and a hearth top plate form a U-shaped flame channel;
wherein, the upper part of one end of the wind shielding pipe 205 far away from the fire outlet 206 is provided with a reburning area 214, and the upper part of one end of the wind shielding pipe 205 near the fire outlet 206 is provided with a burnout area 215;
the biomass fuel preheating system comprises an air preheating air pipe 211, the air preheating air pipe 211 is a steel pipe with a plurality of ventilation holes and is tightly arranged, the air preheating air pipe 211 enters an air heat insulation cavity on the outer wall of a biomass hot blast stove 2, heated air enters a boiler air distribution chamber 7 and is mixed with flue gas to form oxygen-poor air, the oxygen-poor air enters a hearth 204 of the biomass hot blast stove through a fan, and the oxygen-poor air forms oxygen-poor low-nitrogen combustion on biomass fuel in the biomass hot blast stove 2;
the primary air supply fan 207, the air inlet of the primary air supply fan 207 is communicated with the flue gas recovery pipe and is arranged below the grate 208; the primary air supply fan 207 mixes the preheated air with the recovered flue gas to provide oxygen-deficient combustion air for fuel combustion;
the secondary air supply fan 210 is arranged on one side, close to the feeding bin 201, of the U-shaped flame channel, and the secondary air supply fan 210 blows air in the air preheating air pipe 211 into the hearth; the secondary air supply fan 210 is arranged at a certain distance from the main combustion area 213, so that the biomass fuel can be more fully combusted;
and the tertiary air supply fan 212 is arranged on one side of the U-shaped flame channel close to the fire outlet 206.
The working principle is as follows: the biomass fuel is uniformly conveyed to the upper part of the grate 208 through the first auger 203 and is combusted on the grate 208, the motor drives the grate 208 to rotate, combusted residues move on the grate 208 and enter a slag extractor 209 below the grate 208, and the slag extractor 209 discharges slag; under the action of an external draught fan and the wind shielding pipe 205 at the fire outlet 206, a flame channel of the biomass fuel burning above the grate 208 forms a U shape, that is, the upper side of the grate 208 of the burning biomass fuel moves to the lower side of the wind shielding pipe 205, and the external draught fan can make the flame move along the arrow direction shown in fig. 2; meanwhile, secondary air distribution is carried out on the secondary air supply fan 210, the secondary air supply fan 210 blows outside fresh air at the air preheating air pipe 211 into the hearth, the outside air is fused with 20% of hot flue gas sent by the primary air supply fan 207 to carry out oxygen-deficient combustion on biomass fuel, a secondary air distribution nozzle has a certain distance from the grate 208, a gas reduction area is large, and the reduction thermal decomposition of nitrogen oxides generated in the main combustion area 213 in the area is facilitated, so that the generation of the nitrogen oxides is limited; the combustible gas in the main combustion zone 213 enters the reburning zone 214 to be continuously combusted until reaching the burnout zone 215, enough oxygen is supplemented again through the tertiary air supply fan 212 to promote the complete combustion of the combustible gas, and then the combustible gas enters the next working procedure through the fire outlet 206, so that the burnout rate of the fuel reaches 95%;
the working sequence of the biomass hot blast stove 2 is that biomass fuel uniformly enters the grate 208 through the first auger 203 and is combusted in the main combustion area 213, combustible gas and unburnt substances are generated at the moment, flame flows through the U-shaped flame channel, sequentially passes through the reburning area 214 and the burnout area 215, and finally enters the heat exchanger 3 from the fire outlet 206; in the period, the combined air distribution (not all fans are continuously distributed) of the primary air supply fan 207, the secondary air supply fan 210 and the tertiary air supply fan 212 can meet the requirement of oxygen-poor combustion of the biomass fuel, can ensure oxygen required by the biomass fuel, can inhibit the generation of nitrogen oxides, can reduce the thermal decomposition of the nitrogen oxides, and achieves the aim of environmental protection. Can make biomass fuel burning more abundant, reduce nitrogen oxide's emission, environmental protection more.
The flue gas heat exchange cavity 320 comprises:
the first air baffle 312 is fixedly arranged at the bottom of the flue gas heat exchange cavity 320, and the interior of the flue gas heat exchange cavity 320 is divided into a first heat exchange space 313 and a second heat exchange space by the first air baffle 312;
the smoke inlet 301 is positioned in the first heat exchange space 313 and is arranged at the front end of the smoke heat exchange cavity 320, the smoke inlet 301 is communicated with a fire outlet of a hearth of the biomass hot blast stove in the previous process, and hot smoke enters the first heat exchange space 313 from the smoke inlet 1;
the smoke outlet 311 is positioned in the second heat exchange space and is arranged at the rear end of the smoke heat exchange cavity 320, and the smoke outlet 311 is communicated with the next process;
a first high-temperature-resistant air pipe bank 304 for blocking smoke from continuously walking forward is arranged in the first heat exchange space 313 and right in front of the smoke inlet 301, a second high-temperature-resistant air pipe bank 314 and a third high-temperature-resistant air pipe bank 315 are respectively arranged below two sides of the first high-temperature-resistant air pipe bank 304, the second high-temperature-resistant air pipe bank 314 is arranged on the inner wall below the smoke inlet 301 of the smoke heat exchange cavity 320, the third high-temperature-resistant air pipe bank 315 is arranged above the first wind shield 312 and is attached to the upper surface of the first wind shield 312, and the first high-temperature-resistant air pipe bank 304, the second high-temperature-resistant air pipe bank 314 and the third high-temperature-resistant air pipe bank 315 form a U-shaped smoke walking channel;
a second packing auger 306 for conveying dust in the flue gas to the outside of the heat exchanger is arranged below the space between the second high-temperature-resistant air pipe row 314 and the third high-temperature-resistant air pipe row 315, and a feed inlet of the second packing auger 306 is communicated with the lower parts of the second high-temperature-resistant air pipe row 314 and the third high-temperature-resistant air pipe row 315;
the plurality of heat exchange tubes are divided into a first heat exchange tube 305, a second heat exchange tube 303, and heat exchange tubes forming a first high-temperature resistant air duct bank 304, a second high-temperature resistant air duct bank 314, and a third high-temperature resistant air duct bank 315.
The working principle is as follows: hot flue gas generated by a hearth of the biomass hot blast stove 2 in the previous process enters the first heat exchange space 313 through the smoke inlet 301, and due to the action of the first high-temperature resistant air pipe bank 304, the hot flue gas can only flow downwards and can only enter the second heat exchange space through the U-shaped smoke-passing channel, and can not directly enter the second heat exchange space, so that a large amount of smoke dust can fall into the second packing auger 306 below, dust in the flue gas is sent to the outside of the heat exchanger through the second packing auger 306, a small amount of smoke dust enters the second heat exchange space, and the hot flue gas heats the heat exchange pipe in the flue gas heat exchange cavity 320; the second high-temperature-resistant air pipe bank 314 is arranged on the inner wall below the smoke inlet 301 of the smoke heat exchange cavity 320, so that the inner wall at the smoke inlet 301 of the smoke heat exchange cavity 320 can be prevented from being overheated, the normal use of the heat exchanger is ensured, and the service life of the heat exchanger is prolonged; hot flue gas enters from the flue gas inlet 301, heats the heat exchange pipe and further heats air in the heat exchange pipe, and then the flue gas after heat exchange is discharged from the flue gas outlet 311, so that the temperature of the flue gas in the flue gas heat exchange cavity 320 is ensured, and the aim of continuously heating the air in the heat exchange pipe is fulfilled; as can be seen from fig. 4, there are spaces between the first heat exchange tubes 305, so the flue gas can be filled in the flue gas heat exchange cavity 320, and the outer wall of each heat exchange tube can be heated, only a low-power smoke-inducing fan induces smoke, and meanwhile, the heat exchange tubes in the flue gas heat exchange cavity 320 both have the function of blocking smoke and dust, and also have the functions of heat exchange and cooling the tubes.
The first high temperature resistant air duct bank 304, the second high temperature resistant air duct bank 314 and the third high temperature resistant air duct bank 315 are formed by closely arranging and combining a plurality of high temperature resistant heat exchange tubes.
The working principle is as follows: because the temperature of the flue gas which just enters is higher, a high-temperature resistant heat exchange tube is selected, so that the service life of the heat exchange tube is prolonged; in order to prevent the flue gas from directly entering the second heat exchange space and ensure that the flue gas passes through the U-shaped smoke channel, the heat exchange tubes are closely arranged, so that the trend of the flue gas is controllable, and meanwhile, the purpose of dropping a large amount of smoke dust into the second packing auger 306 below can be achieved, and automatic cleaning is realized.
A second air baffle 308 for preventing the flue gas from flowing from the bottom is arranged in the second heat exchange space, the second air baffle 308 divides the second heat exchange space into a first heat exchange cavity 309 and a second heat exchange cavity 310, and the bottoms of the first heat exchange cavity 309 and the second heat exchange cavity 310 are both provided with a dust removing port 307.
The working principle is as follows: after the hot flue gas enters the second heat exchange space, in order to prevent the flue gas from flowing from the bottom, a second air baffle 308 is arranged, so that the flue gas can flow above, and further the purpose of heating the outer wall of the first heat exchange tube 305 of the second heat exchange space by the hot flue gas is realized, then the flue gas is discharged from a flue gas outlet 311, and during the period, a small amount of flue gas can fall to the lower part of the second heat exchange space and is cleaned through an ash cleaning port 307.
The inner side of the top wall of the flue gas heat exchange cavity 320 is provided with a second heat exchange tube 303 for preventing the temperature of the top wall of the heat exchanger from being too high, the second heat exchange tube 303 is tightly arranged on the inner side of the top wall of the heat exchanger, and the outer side of the top wall of the heat exchanger is also provided with heat preservation cotton 302;
the second heat exchange tube 303 in the first heat exchange space 313 is a high temperature resistant steel tube.
The working principle is as follows: because the flue gas temperature that just got into is higher, so choose high temperature resistant heat exchange tube for use, and adopt the mode of inseparable range, the heat exchange tube will play the effect of isolation temperature like this, that is to say, because the isolation effect of heat exchange tube, the heat of hot flue gas can be used on the heat exchange tube, can not directly use the roof of heat exchanger, the purpose of protection heat exchanger has been played, the life of heat exchanger has been improved, the normal use of heat exchanger has been guaranteed, the roof outside of heat exchanger still is provided with heat preservation cotton 302, heat preservation cotton 302 can make the difficult giving off of heat of flue gas heat transfer chamber 320, the thermal loss has been reduced, can make the flue gas to the better heating of heat exchange.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (7)
1. The utility model provides a heating device of grain drying tower which characterized in that includes:
the device comprises a feeding machine (1), wherein the discharge end of the feeding machine (1) is communicated with a feeding bin (201) of a biomass hot blast stove (2), a fire outlet (206) of the biomass hot blast stove (2) is communicated with a smoke inlet (301) of a heat exchanger (3), a smoke outlet (311) of the heat exchanger (3) is communicated with an inlet end of a smoke waste heat recoverer (4), high-temperature smoke enters the smoke waste heat recoverer (4) after heat exchange for further heat exchange, part of the smoke is recovered into a boiler air distribution chamber (7) through a smoke recovery pipe, hot smoke enters the biomass hot blast stove (2) through the boiler air distribution chamber (7), and part of the smoke enters a dust remover (5) and is discharged outdoors through a chimney (6) after purification and dust removal;
outside air enters an air heat-preservation cavity on the outer wall of the biomass hot blast stove (2) through a preheater air inlet pipe (9), heated air enters a boiler air distribution chamber (7) to be mixed with flue gas to form oxygen-poor air, the oxygen-poor air enters a hearth of the biomass hot blast stove (2) through a fan, the oxygen-poor air forms oxygen-poor low-nitrogen combustion on biomass fuel in the biomass hot blast stove (2), and the emission of nitrogen oxides generated by combustion is lower than 200mg/m 3;
outside air enters the heat exchanger (3) through a heat exchanger air inlet pipe (8), heated air enters a drying tower air distribution chamber (10) from a heat exchanger air outlet pipe (12), and hot air in the drying tower air distribution chamber (10) is sent into the drying tower by a drying tower fan (11) to dry grains;
outside air enters the flue gas waste heat recoverer (4) through a flue gas waste heat recoverer air inlet pipe (13), the outlet temperature of the flue gas waste heat recoverer (4) is 85-100 degrees, and the outside air is changed into hot air through heat exchange and then enters the drying tower air distribution chamber (10) through a pipeline;
wherein the biomass hot blast stove (2) comprises:
a furnace (204);
the biomass fuel feeding device comprises a feeding bin (201), wherein a first packing auger (203) is arranged in the feeding bin (201), the first packing auger (203) is communicated with the feeding bin (201) and a hearth (204), and biomass fuel enters the hearth (204) through the first packing auger (203);
wherein, the bottom of the hearth (204) is also provided with a primary air supply fan (207) which feeds oxygen-poor gas mixed by the recovered flue gas and the hot air into the hearth (204);
the heat exchanger (3) comprises:
the air inlet cavity (316) is arranged on one side inside the heat exchanger and is communicated with the outside air;
the flue gas heat exchange cavity (320) is arranged in the middle of the heat exchanger, a plurality of heat exchange tubes are welded in the flue gas heat exchange cavity (320), and one ends of the heat exchange tubes are communicated with the gas inlet cavity (316);
the first air exchange cavity (318) is arranged on the other side in the heat exchanger, the first air exchange cavity (318) is communicated with the other end of the heat exchange tube, the first air exchange cavity (318) is communicated with the second air exchange cavity (317) through the heat exchange tube, and the second air exchange cavity (317) is communicated with the next process;
the air inlet cavity (316) and the second air exchange cavity (317) are arranged on the same side, and the air inlet cavity (316), the flue gas heat exchange cavity (320), the first air exchange cavity (318) and the second air exchange cavity (317) are separated through a partition plate (319) and are arranged independently;
the heat exchange tube of the front end of flue gas heat transfer chamber (320) is provided with the flue gas pavement of U type, the flue gas pavement bottom of U type is provided with and is arranged in sending the dust in the flue gas to the outside second auger (306) of heat exchanger, and hot flue gas gets into from the front end of flue gas heat transfer chamber (320) and gets into the outer wall heating of flue gas heat exchange chamber (320) to the heat exchange tube through the flue gas pavement of U type, and the dust of flue gas falls into in second auger (306).
2. A heating installation of a grain drying tower according to claim 1, characterized in that said feed bin (201) comprises:
the first packing auger (203), the first packing auger (203) is fixedly arranged in the feeding bin (201), and a discharge hole of the first packing auger (203) is communicated with the hearth (204);
the motor (202), the said motor (202) is fixedly mounted in feeding the storehouse (201), and connect with first auger (203) through the belt;
the feed inlet is arranged above the feeding bin (201) and communicated with the first packing auger (203).
3. The heating device of the grain drying tower according to claim 2, wherein a fire outlet is arranged above one end of the furnace (204), and the furnace (204) comprises:
the grate (208) is composed of a plurality of steel pipes with vent holes, a motor drives each steel pipe to rotate in the same direction, the grate (208) is close to the wall of the hearth and is positioned below a discharge hole of the first auger (203), and a main combustion area (213) is arranged above the grate (208);
the slag extractor (209), the slag extractor (209) is arranged at the other end of the grate (208) and below the grate (208), and the slag extractor (209) is used for receiving the burnt-off slag;
the air blocking pipe (205) is formed by a plurality of steel pipes in parallel, the air blocking pipe (205) is arranged above the fire grate (208), the air blocking pipe (205) is fixedly connected with the interior of the hearth (204), one end of the air blocking pipe (205) is arranged below the fire outlet (206), and the other end of the air blocking pipe (205), the fire grate (208) and the hearth top plate form a U-shaped flame channel;
a reburning area (214) is arranged above one end, far away from the fire outlet (206), of the wind blocking pipe (205), and a burnout area (215) is arranged above one end, close to the fire outlet (206), of the wind blocking pipe (205);
the biomass fuel preheating system comprises an air preheating air pipe (211), wherein the air preheating air pipe (211) is a steel pipe with a plurality of ventilation holes and is tightly arranged, the air preheating air pipe (211) enters an outer wall air heat insulation cavity of a biomass hot blast stove (2), heated air enters a boiler air distribution chamber (7) and is mixed with flue gas to form oxygen-poor air, the oxygen-poor air enters a hearth (204) of the biomass hot blast stove through a fan, and the oxygen-poor air forms oxygen-poor low-nitrogen combustion on biomass fuel in the biomass hot blast stove (2);
the primary air supply fan (207), the air intake of the primary air supply fan (207) is communicated with the flue gas recovery pipe and is arranged below the grate (208);
the secondary air supply fan (210) is arranged on one side, close to the feeding bin (201), of the U-shaped flame channel, and the secondary air supply fan (210) blows air in the air preheating air pipe (211) into the hearth;
and the tertiary air supply fan (212) is arranged on one side of the U-shaped flame channel close to the fire outlet (206).
4. The heating installation of a grain drying tower according to claim 1, characterized in that said flue gas heat exchange chamber (320) comprises:
the first air baffle (312) is fixedly arranged at the bottom of the smoke heat exchange cavity (320), and the first air baffle (312) divides the interior of the smoke heat exchange cavity into a first heat exchange space (313) and a second heat exchange space;
the smoke inlet (301) is positioned in the first heat exchange space (313) and arranged at the front end of the smoke heat exchange cavity (320), the smoke inlet (301) is communicated with a fire outlet of a hearth of the biomass hot blast stove in the previous process, and hot smoke enters the first heat exchange space (313) from the smoke inlet (301);
the smoke outlet (311) is positioned in the second heat exchange space and arranged at the rear end of the smoke heat exchange cavity (320), and the smoke outlet (311) is communicated with the next process;
a first high-temperature-resistant air pipe row (304) used for blocking smoke from continuously walking forward is arranged in the first heat exchange space (313) and right in front of the smoke inlet (301), a second high-temperature-resistant air pipe row (314) and a third high-temperature-resistant air pipe row (315) are respectively arranged below two sides of the first high-temperature-resistant air pipe row (304), the second high-temperature-resistant air pipe row (314) is arranged on the inner wall below the smoke inlet (301) of the smoke heat exchange cavity (320), the third high-temperature-resistant air pipe row (315) is arranged above the first wind shield (312) and is attached to the upper surface of the first wind shield (312), and the first high-temperature-resistant air pipe row (304), the second high-temperature-resistant air pipe row (314) and the third high-temperature-resistant air pipe row (315) form a U-shaped smoke walking channel;
a second packing auger (306) used for conveying dust in flue gas to the outside of the heat exchanger is arranged below the space between the second high-temperature-resistant air pipe row (314) and the third high-temperature-resistant air pipe row (315), and a feed inlet of the second packing auger (306) is communicated with the lower parts of the second high-temperature-resistant air pipe row (314) and the third high-temperature-resistant air pipe row (315);
the heat exchange tubes are divided into a first heat exchange tube (305), a second heat exchange tube (303) and heat exchange tubes which form a first high-temperature-resistant air pipe bank (304), a second high-temperature-resistant air pipe bank (314) and a third high-temperature-resistant air pipe bank (315).
5. The heating device of the grain drying tower according to claim 4, wherein the first high temperature resistant air duct bank (304), the second high temperature resistant air duct bank (314) and the third high temperature resistant air duct bank (315) are formed by closely arranging and combining a plurality of high temperature resistant heat exchange tubes.
6. The heating device of the grain drying tower according to claim 4, wherein a second damper (308) is arranged in the second heat exchanging space for preventing flue gas from flowing from the bottom, the second damper (308) divides the second heat exchanging space into a first heat exchanging cavity (309) and a second heat exchanging cavity (310), and the bottoms of the first heat exchanging cavity (309) and the second heat exchanging cavity (310) are provided with ash removing openings (307).
7. The heating device of the grain drying tower as claimed in claim 4, wherein a second heat exchange pipe (303) for preventing the temperature of the top wall of the heat exchanger from being too high is arranged on the inner side of the top wall of the flue gas heat exchange cavity (320), the second heat exchange pipe (303) is closely arranged on the inner side of the top wall of the heat exchanger, and heat insulation cotton (302) is further arranged on the outer side of the top wall of the heat exchanger;
the second heat exchange tube (303) in the first heat exchange space (313) is a high-temperature-resistant steel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020658005.4U CN212205563U (en) | 2020-04-27 | 2020-04-27 | Heating device of grain drying tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020658005.4U CN212205563U (en) | 2020-04-27 | 2020-04-27 | Heating device of grain drying tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212205563U true CN212205563U (en) | 2020-12-22 |
Family
ID=73827884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020658005.4U Expired - Fee Related CN212205563U (en) | 2020-04-27 | 2020-04-27 | Heating device of grain drying tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212205563U (en) |
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2020
- 2020-04-27 CN CN202020658005.4U patent/CN212205563U/en not_active Expired - Fee Related
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Granted publication date: 20201222 |