CN220931544U - Biomass hot air water heater for double-heat-medium grain dryer - Google Patents
Biomass hot air water heater for double-heat-medium grain dryer Download PDFInfo
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- CN220931544U CN220931544U CN202322840553.5U CN202322840553U CN220931544U CN 220931544 U CN220931544 U CN 220931544U CN 202322840553 U CN202322840553 U CN 202322840553U CN 220931544 U CN220931544 U CN 220931544U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000002028 Biomass Substances 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000428 dust Substances 0.000 claims description 34
- 238000005192 partition Methods 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 27
- 239000003546 flue gas Substances 0.000 abstract description 27
- 239000000446 fuel Substances 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 description 5
- 239000003500 flue dust Substances 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a biomass hot air water heater for a double-heat-medium grain dryer, which comprises a furnace body, a burner, a first heat exchanger and a second heat exchanger, wherein a storage bin is arranged on one side outside the furnace body so as to be convenient for conveying biomass granular fuel, a heat exchange chamber is arranged in the furnace body, an air inlet is arranged on one side of the heat exchange chamber, an air outlet is arranged on the other side of the heat exchange chamber, the burner is arranged in the heat exchange chamber and is close to one side of the air outlet, the first heat exchanger is arranged in the heat exchange chamber and is close to one side of the air inlet, and the second heat exchanger is arranged outside the heat exchange chamber. From this, can provide hot-blast and hot-water simultaneously as the heat conduction medium of grain drying-machine through this living beings hot-blast hot-water heating stove, need not additionally to purchase hot-water equipment to greatly reduced the cost, heat in the second heat exchanger in addition comes from the high temperature flue gas after the heat transfer in the first heat exchanger, is equivalent to recycling some flue gas heat once more, thereby has promoted the waste heat utilization ratio of high temperature flue gas greatly.
Description
Technical Field
The utility model relates to the technical field of grain drying, in particular to a biomass hot air water heater for a double-heat-medium grain dryer.
Background
For many years, vast rural areas in China are used to adopting a court airing method for drying grains, and the main disadvantage of adopting the drying method is that the grain is greatly influenced by weather, and once the grains are in a rainy day, the recovered grains are often not timely aired to safe moisture, so that the grains germinate or are mildewed. Therefore, a grain dryer is designed, which is equipment for drying grains, utilizes flowing hot air to dry the grains, reduces the water content of the grains, is convenient for storing and transporting the grains, and inhibits the breeding of microorganisms.
The traditional grain dryer generally adopts single hot air as a heat source, the single hot air has low energy, and the drying efficiency is generally low; therefore, the double-heating-medium grain dryer is designed, and grains are dried by taking hot water and hot air as heat conducting media at the same time, so that the heat exchange efficiency is improved; however, the traditional hot blast stove can only provide single hot blast as a heat transfer medium, and the equipment of the hot blast medium is usually purchased separately, so that the purchase cost is greatly increased, the two independent heat medium equipment needs to consume double fuel, the use cost is greatly increased, and the energy utilization rate is very low.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the biomass hot air water heater for the double-heat-medium grain dryer can simultaneously provide hot air and hot water as heat conducting media, and can simultaneously meet the requirements of double heat mediums by using one fuel, thereby greatly reducing the use cost.
According to the embodiment of the utility model, the biomass hot air water heater for the double-heating-medium grain dryer comprises:
the furnace body is internally provided with a heat exchange chamber, one side of the heat exchange chamber is provided with an air inlet, and the other side of the heat exchange chamber is provided with an air outlet;
the bin is arranged outside the furnace body;
The burner is arranged in the heat exchange chamber, one side of the burner is provided with a feed inlet, the other side of the burner is provided with an exhaust port, and the feed inlet is communicated with the stock bin;
The first heat exchanger is arranged in the heat exchange chamber and is close to one side of the air inlet, the heat exchanger comprises a heat exchange tube assembly, an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the air outlet, one side of the heat exchange tube assembly is communicated with the air inlet cavity, and the other side of the heat exchange tube assembly is communicated with the air outlet cavity so as to be used for heating cold air at the air inlet; and
The second heat exchanger is arranged outside the heat exchange chamber and comprises a heat exchange water chamber and a second heat exchange tube, the second heat exchange tube is arranged in the heat exchange water chamber in a penetrating mode, and one end of the second heat exchange tube is communicated with the air outlet cavity.
According to some embodiments of the utility model, the biomass hot air water heater further comprises: the cyclone dust collector is arranged in the heat exchange chamber and comprises an air inlet and an air outlet, the air inlet is communicated with the air outlet, and the air outlet is communicated with the air inlet cavity.
According to some embodiments of the utility model, the biomass hot air water heater further comprises: the dust removal cavity is arranged at the bottom of the heat exchange chamber, the heat exchange tube assembly comprises a plurality of heat exchange tube units, each heat exchange tube unit comprises a plurality of heat exchange tubes, and the heat exchange tubes are vertically arranged and the bottom of each heat exchange tube is communicated with the dust removal cavity.
According to some embodiments of the utility model, a partition is disposed in the dust removing chamber, and at least one partition is disposed between adjacent heat exchange tube units to form a serpentine path.
According to some embodiments of the utility model, at least one of the heat exchange tube units forms a first tube group, at least one of the heat exchange tube units forms a second tube group, the first tube group is arranged on a side close to the burner, and the sum of cross-sectional areas of the heat exchange tubes of the heat exchange tube units in the first tube group is larger than the sum of cross-sectional areas of the heat exchange tubes of the heat exchange tube units in the second tube group.
According to some embodiments of the utility model, the biomass hot air water heater further comprises: the centrifugal fan is arranged on the furnace body and/or the second heat exchanger is arranged on the furnace body, the air exhausting end of the centrifugal fan is communicated with the air outlet cavity, and the air outlet is communicated with the second heat exchanger.
According to some embodiments of the utility model, the biomass hot air water heater further comprises: and the two ends of the spiral feeder are respectively communicated with the storage bin and the burner.
The beneficial effects are that:
The biomass hot air water heater can simultaneously provide hot air and hot water as heat transfer media of the grain dryer, hot water equipment is not required to be purchased additionally, so that the cost is greatly reduced, and the heat in the second heat exchanger is derived from high-temperature flue gas after heat exchange in the first heat exchanger, which is equivalent to recycling part of flue gas heat again, so that the residual heat utilization rate of the high-temperature flue gas is greatly improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the overall structure of a biomass hot air water heater according to an embodiment of the utility model;
FIG. 2 is a schematic cross-sectional view of a biomass hot air water heater according to an embodiment of the utility model;
Fig. 3 is a schematic structural view of a heat exchange tube assembly according to an embodiment of the present utility model.
Reference numerals:
100. A biomass hot air water heater;
1. A furnace body; 11. a heat exchange chamber; 12. an air inlet; 13. an air outlet; 2. a storage bin; 3. a burner; 31. an exhaust port; 4. a cyclone dust collector; 41. an air inlet; 42. an air outlet; 5. a first heat exchanger; 51. an air inlet cavity; 52. a heat exchange tube assembly; 521. a heat exchange tube unit; 522. a first heat exchange tube; 53. an air outlet cavity; 6. a second heat exchanger; 61. a heat exchange water chamber; 62. a second heat exchange tube; 7. a dust removal cavity; 71. a partition plate; 8. a centrifugal fan; 9. screw feeder.
Detailed Description
Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.
A biomass hot air water heater 100 for a dual heat medium grain dryer according to an embodiment of the present utility model will be described with reference to fig. 1 to 3.
Referring to fig. 1 and 2, a biomass hot air water heater 100 for a dual-heating medium grain dryer according to an embodiment of the present utility model includes: furnace body 1, combustor 3, first heat exchanger 5 and second heat exchanger 6, wherein, one side outside furnace body 1 is equipped with feed bin 2 to be convenient for carry living beings pellet fuel, be equipped with heat transfer chamber 11 in furnace body 1, one side of heat transfer chamber 11 is equipped with air intake 12, and the opposite side is equipped with air outlet 13, and combustor 3 locates in heat transfer chamber 11 and is close to air outlet 13 one side, and first heat exchanger 5 locates in heat transfer chamber 11 and is close to air intake 12 one side, and second heat exchanger 6 locates outside heat transfer chamber 11. When the biomass particle fuel combustion device is used, biomass particle fuel in the storage bin 2 can enter the combustor 3 to be combusted, high-temperature flue gas generated by combustion can generate heat exchange at the first heat exchanger 5, so that cold air outside the furnace body 1 firstly flows through the first heat exchanger 5 when entering the heat exchange chamber 11, the cold air is heated to become hot air, and the heated air can leave the furnace body 1 from the air outlet 13 and is used as a hot air source of the grain dryer.
Specifically, one side of combustor 3 is equipped with the feed inlet, and the opposite side is equipped with gas vent 31, and the bottom is equipped with primary air inlet 41, and feed inlet and feed bin 2 intercommunication, in the biomass pellet fuel in the feed bin 2 got into combustor 3 through the feed inlet, and the fresh air that primary air inlet 41 got into can assist biomass pellet fuel to fully burn, and the high temperature flue gas that produces after the fully burn can leave combustor 3 through gas vent 31.
The first heat exchanger 5 comprises a heat exchange tube assembly 52, an air inlet cavity 51 and an air outlet cavity 53, wherein the air inlet cavity 51 is communicated with the air outlet 31, one side of the heat exchange tube assembly 52 is communicated with the air inlet cavity 51, and the other side is communicated with the air outlet cavity 53.
The second heat exchanger 6 includes a heat exchange water chamber 61 and a second heat exchange tube 62, where a plurality of second heat exchange tubes 62 are penetrating through the heat exchange water chamber 61, one end of the second heat exchange tube 62 is communicated with the air outlet cavity 53, more specifically, in order to facilitate the high-temperature flue gas to more uniformly pass through the second heat exchange tube 62, two sides of the heat exchange water chamber 61 are respectively provided with an air inlet chamber and an air outlet chamber, that is, two ends of the second heat exchange tube 62 respectively extend into the air inlet chamber and the air outlet chamber, the air inlet chamber is communicated with the air outlet cavity 53 of the first heat exchanger 5, and it is noted that the heat exchange water chamber 61 is not communicated with the air inlet chamber and the air outlet chamber, and the heat exchange water chamber 61 is provided with a water inlet and a water outlet.
In practical use, the flue gas in the air outlet chamber can be directly exhausted, and the flue gas can also enter the air outlet 13 under the condition that the quality of biomass fuel is clean, so that the hot flue gas after heat exchange and the hot air in the heat exchange chamber enter the grain dryer together, and the energy utilization rate is further improved.
In use, cold water enters the heat exchange water chamber 61 from the water inlet and exchanges heat with the high temperature air at the second heat exchange tube 62, so that the cold water becomes hot water required for the grain dryer.
Therefore, the biomass hot air water heater can simultaneously provide hot air and hot water as heat transfer media of the grain dryer, and additional water heating equipment is not needed, so that the cost is greatly reduced, and the heat in the second heat exchanger 6 is derived from high-temperature flue gas after heat exchange in the first heat exchanger 5, which is equivalent to recycling part of the heat of the flue gas again, so that the residual heat utilization rate of the high-temperature flue gas is greatly improved.
Further, on the basis of the above embodiment, as shown in fig. 1 and 2, the biomass hot air water boiler further includes a cyclone dust collector 4, the cyclone dust collector 4 is disposed in the heat exchange chamber 11, the air inlet 41 of the cyclone dust collector 4 is communicated with the air outlet 31, the top of the cyclone dust collector 4 is provided with an air outlet 42, the air outlet 42 is communicated with the air inlet cavity 51, during use, high-temperature flue gas after full combustion in the combustor 3 enters the cyclone dust collector 4, the cyclone dust collector 4 can separate flue dust in the flue gas by utilizing the principle of centrifugal dust removal, the separated flue dust is directly discharged from the ash discharge port at the bottom, and the flue gas after the flue dust separation enters the first heat exchanger 5 for air heat exchange, so that the flue dust content of the flue gas entering the first heat exchanger 5 can be reduced by the cyclone dust collector 4, and the flue dust is prevented from accumulating and blocking in the heat exchange tube assembly 52, and the heat exchange effect is affected.
In some embodiments of the present utility model, as shown in fig. 1 and 3, the biomass hot air water boiler further includes a dust removing cavity 7, the dust removing cavity 7 is disposed at the bottom of the heat exchange chamber 11, the heat exchange tube assembly 52 includes a plurality of heat exchange tube units 521, each heat exchange tube unit 521 includes a plurality of first heat exchange tubes 522, so as to increase a heat exchange area and improve heat exchange efficiency, each first heat exchange tube 522 is adjacent and vertically disposed, and the bottom of each first heat exchange tube 522 is communicated with the dust removing cavity 7, and in use, high-temperature flue gas flows from one end to the other end in the first heat exchange tube 522, and when the high-temperature flue gas flows into the dust removing cavity 7, smoke dust settlement occurs, so that the smoke dust content in the high-temperature flue gas flowing into the second heat exchanger 6 is reduced, and the smoke dust is prevented from accumulating at the second heat exchanger 6 to affect the heat exchange effect.
Further, on the basis of the above embodiment, as shown in fig. 1 and 3, a partition 71 is disposed in the dust removing cavity 7, at least one partition 71 is disposed between adjacent heat exchange tube units 521 to form a serpentine path, specifically, taking two partitions 71 disposed in the drawing as an example, the dust removing cavity 7 can be divided into three chambers by the two partitions 71, and each chamber is correspondingly connected to two heat exchange tube units 521 from one side to the other side, and when in use, high temperature flue gas moves from top to bottom along the first heat exchange tube 522 of the first row of heat exchange tube units 521 into the first chamber, and part of the flue gas is settled in the first chamber, then the high temperature flue gas moves from bottom to top along the first heat exchange tube 522 of the second row of heat exchange tube units 521, and the top of the first heat exchange tube 522 of the third row of heat exchange tube units 521 is connected to the top of the first heat exchange tube 522 of the second row of heat exchange tube units 521, and then flows from top to bottom within the first heat exchange tube 522 of the second row of heat exchange tube units 521.
Therefore, the serpentine passage with the dust removing cavity 7 chamber is beneficial to realizing multiple dust sedimentation, further reduces the dust content in high-temperature flue gas, reduces the dust content entering the second heat exchanger 6, avoids the influence of accumulation in the second heat exchanger 6 on the heat exchange effect, and can also reduce the dust removing times.
In some embodiments of the present utility model, at least one heat exchange tube unit 521 forms a first tube group, at least one heat exchange tube unit 521 forms a second tube group, the first tube group is disposed near one side of the burner 3, the sum of the cross-sectional areas of the first heat exchange tubes 522 of the heat exchange tube units 521 in the first tube group is larger than the sum of the cross-sectional areas of the first heat exchange tubes 522 of the heat exchange tube units 521 in the second tube group, specifically, taking that each heat exchange tube unit 521 is provided with the same number of first heat exchange tubes 522 as an example, the first heat exchange tubes 522 can adopt at least two different tube diameters, and the tube diameters of the first heat exchange tubes 522 of the heat exchange tube units 521 near one side of the burner 3 are larger, so that the unsmooth flow caused by smoke and dust adhering to the tube walls of the first heat exchange tubes 522 after long-term use is avoided, and the same management is that the smoke and dust flowing in the first heat exchange tubes 522 far from the burner 3 is cleaner, so that the first heat exchange tubes 522 with small tube diameters can be adopted to perform heat exchange, and the service life of the first heat exchanger 5 is prolonged.
In some embodiments of the present utility model, as shown in fig. 1, the biomass hot air water heater further includes a centrifugal fan 8, where the centrifugal fan 8 is disposed on the furnace body 1 and/or the second heat exchanger 6 is disposed on the furnace body 1, an exhaust end of the centrifugal fan 8 is communicated with the air outlet cavity 53, and an air outlet is communicated with the second heat exchanger 6, and specifically, disposing the centrifugal fan 8 and the second heat exchanger 6 on the furnace body 1 is beneficial to reducing an occupied area of the furnace body 1, and is beneficial to daily maintenance and overhaul, especially, the second heat exchanger 6 includes the heat exchange water chamber 61, so as to facilitate observation of whether the heat exchange water chamber 61 has leakage, thereby improving use safety.
The centrifugal fan 8 is arranged between the first heat exchanger 5 and the second heat exchanger 6, so that the negative pressure state is maintained at the first heat exchanger 5, the smooth circulation of the flue gas along the direction of the combustion chamber-the first heat exchanger 5 is ensured, and the problem of overlarge air resistance in the first heat exchanger 5 is reduced.
In some embodiments of the present utility model, as shown in fig. 2, the biomass hot air water heater further includes a screw feeder 9, two ends of the screw feeder 9 are respectively connected to the storage bin 2 and the burner 3, and a conveying speed of biomass fuel into the burner 3 can be controlled through the screw feeder 9, so that energy consumption can be more precisely controlled. Meanwhile, the tightness of the screw feeder 9 is good, so that the flame in the combustor 3 can be prevented from igniting to the storage bin 2, and the use is safer.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The utility model provides a two heat medium grain hot-blast water heater of living beings for drying-machine which characterized in that includes:
the furnace body is internally provided with a heat exchange chamber, one side of the heat exchange chamber is provided with an air inlet, and the other side of the heat exchange chamber is provided with an air outlet;
the bin is arranged outside the furnace body;
The burner is arranged in the heat exchange chamber, one side of the burner is provided with a feed inlet, the other side of the burner is provided with an exhaust port, and the feed inlet is communicated with the stock bin;
The first heat exchanger is arranged in the heat exchange chamber and is close to one side of the air inlet, the first heat exchanger comprises a heat exchange tube assembly, an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the air outlet, one side of the heat exchange tube assembly is communicated with the air inlet cavity, and the other side of the heat exchange tube assembly is communicated with the air outlet cavity so as to be used for heating cold air at the air inlet; and
The second heat exchanger is arranged outside the heat exchange chamber and comprises a heat exchange water chamber and a second heat exchange tube, the second heat exchange tube is arranged in the heat exchange water chamber in a penetrating mode, and one end of the second heat exchange tube is communicated with the air outlet cavity.
2. The biomass hot air water heater for a dual heat medium grain dryer of claim 1, further comprising: the cyclone dust collector is arranged in the heat exchange chamber and comprises an air inlet and an air outlet, the air inlet is communicated with the air outlet, and the air outlet is communicated with the air inlet cavity.
3. The biomass hot air water heater for a dual heat medium grain dryer according to claim 1 or 2, further comprising: the dust removal cavity is arranged at the bottom of the heat exchange chamber, the heat exchange tube assembly comprises a plurality of heat exchange tube units, each heat exchange tube unit comprises a plurality of first heat exchange tubes, and the first heat exchange tubes are vertically arranged and the bottom is communicated with the dust removal cavity.
4. A biomass hot air water heater for a dual heat medium grain dryer as claimed in claim 3, wherein a partition is provided in said dust removal chamber, at least one of said partitions being provided between adjacent heat exchange tube units to form a serpentine path.
5. A biomass hot air water heater for a dual heating medium grain dryer as claimed in claim 3, wherein at least one of said heat exchange tube units forms a first tube group and at least one of said heat exchange tube units forms a second tube group, said first tube group being disposed adjacent to said burner, the sum of the cross-sectional areas of said heat exchange tubes in said first tube group being greater than the sum of the cross-sectional areas of said heat exchange tubes in said second tube group.
6. The biomass hot air water heater for a dual heat medium grain dryer of claim 1, further comprising: the centrifugal fan is arranged on the furnace body and/or the second heat exchanger is arranged on the furnace body, the air exhausting end of the centrifugal fan is communicated with the air outlet cavity, and the air outlet is communicated with the second heat exchanger.
7. The biomass hot air water heater for a dual heat medium grain dryer of claim 1, further comprising: and the two ends of the spiral feeder are respectively communicated with the storage bin and the burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322840553.5U CN220931544U (en) | 2023-10-23 | 2023-10-23 | Biomass hot air water heater for double-heat-medium grain dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322840553.5U CN220931544U (en) | 2023-10-23 | 2023-10-23 | Biomass hot air water heater for double-heat-medium grain dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220931544U true CN220931544U (en) | 2024-05-10 |
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ID=90961019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322840553.5U Active CN220931544U (en) | 2023-10-23 | 2023-10-23 | Biomass hot air water heater for double-heat-medium grain dryer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220931544U (en) |
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2023
- 2023-10-23 CN CN202322840553.5U patent/CN220931544U/en active Active
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