阅读说明：本技术 一种连续式谷物热泵烘干系统 (Continuous grain heat pump drying system ) 是由 张正礼 史文杰 吕云凯 腾闯 王曙光 于 2021-08-20 设计创作，主要内容包括：本发明属于谷物烘干设备技术领域,尤其涉及一种连续式谷物热泵烘干系统,包括烘干机、多台空气能热泵、总热风管、脉冲除尘器、沉降室和热风房；所述热风房设置在沉降室的上方,所述脉冲除尘器的进风口与沉降室的上部连通,所述脉冲除尘器的出风口与热风房连通,所述空气能热泵设置在热风房内,多台所述空气能热泵的热风出口均与总热风管连通,所述总热风管的热风出口与烘干机的热风道连通,所述烘干机的废气道与沉降室连通；所述热风房上设置有与外界连通的排气风帽和补气风帽,所述排气风帽与空气能热泵的冷风出口连通,所述补气风帽与热风房连通,所述补气风帽的空气进口高于排气风帽的冷风出口设置。(The invention belongs to the technical field of grain drying equipment, and particularly relates to a continuous grain heat pump drying system which comprises a dryer, a plurality of air energy heat pumps, a total hot air pipe, a pulse dust collector, a settling chamber and a hot air room; the hot air room is arranged above the settling chamber, the air inlet of the pulse dust collector is communicated with the upper part of the settling chamber, the air outlet of the pulse dust collector is communicated with the hot air room, the air energy heat pumps are arranged in the hot air room, the hot air outlets of the air energy heat pumps are communicated with a main hot air pipe, the hot air outlet of the main hot air pipe is communicated with a hot air channel of the dryer, and the waste air channel of the dryer is communicated with the settling chamber; the hot blast room is provided with an exhaust blast cap and an air supply blast cap which are communicated with the outside, the exhaust blast cap is communicated with a cold air outlet of the air energy heat pump, the air supply blast cap is communicated with the hot blast room, and an air inlet of the air supply blast cap is higher than the cold air outlet of the exhaust blast cap.)

1. The utility model provides a continuous type cereal heat pump drying system which characterized in that: the device comprises a dryer (1), a plurality of air energy heat pumps (2), a total hot air pipe (3), a pulse dust collector (4), a settling chamber (5) and a hot air room (6);

the hot air room (6) is arranged above the settling chamber (5), the air inlet of the pulse dust collector (4) is communicated with the upper part of the settling chamber (5), the air outlet of the pulse dust collector (4) is communicated with the hot air room (6), the air energy heat pump (2) is arranged in the hot air room (6), the hot air outlets of the air energy heat pumps (2) are communicated with the main hot air pipe (3), the hot air outlet of the main hot air pipe (3) is communicated with the hot air duct (11) of the dryer (1), and the waste air duct (12) of the dryer (1) is communicated with the settling chamber (5);

be provided with exhaust hood (61) and tonifying qi hood (62) with external intercommunication on hot-blast room (6), exhaust hood (61) and the cold wind export intercommunication of air energy heat pump (2), tonifying qi hood (62) and hot-blast room (6) intercommunication, the air intlet of tonifying qi hood (62) is higher than the cold wind export setting of exhaust hood (61).

2. The continuous grain heat pump drying system of claim 1, wherein: be provided with a plurality of material blocking structures in settling chamber (5), it is a plurality of material blocking structure sets gradually along the tail gas air current direction in settling chamber (5), and the preceding material blocking structure has air current clearance (51) between the bottom of material blocking structure and the bottom of settling chamber (5), and adjacent the latter material blocking structure also has air current clearance (51) between the top of material blocking structure and the upper portion of settling chamber (5).

3. The continuous grain heat pump drying system of claim 2, wherein: the material blocking structure comprises a baffle (52), and the baffle (52) is fixedly connected with the settling chamber (5).

4. The continuous grain heat pump drying system of claim 2, wherein: keep off the material structure including the flexible fender section (53) and the rigid fender section (54) that connect gradually, flexible fender section (53) and deposit room (5) fixed connection, rigid fender section (54) are through rope (55) and deposit room (5) fixed connection, rope (55) are located corresponding air current clearance (51) department.

5. The continuous grain heat pump drying system of claim 4, wherein: the flexible blocking section (53) is made of rubber, plastics, foam or non-woven fabrics.

6. The continuous grain heat pump drying system according to any one of claims 1 to 5, wherein: the device comprises a settling chamber (5), a plurality of pulse dust collectors (4), a hot air room (6), a plurality of pulse dust collectors (4), a plurality of air-conditioning units and a plurality of air-conditioning units, wherein the pulse dust collectors (4) are arranged in the hot air room (6) in sequence and are vertical to the tail gas flow direction of the settling chamber (5); the air energy heat pumps (2) are also arranged in sequence in a direction vertical to the tail gas flow direction of the settling chamber (5).

7. The continuous grain heat pump drying system of claim 6, wherein: the quantity of exhaust hood (61) and the quantity of air-source heat pump (2) set up relatively, the air inlet department of tonifying qi hood (62) is provided with tonifying qi grid (621), setting up of exhaust hood (61) is kept away from in tonifying qi grid (621).

8. The continuous grain heat pump drying system of claim 6, wherein: the dryer (1) comprises two continuous drying towers (13) and two fans (14), the two fans (14) are positioned at two sides of a hot air channel (11) of the dryer (1), the two drying towers (13) are mutually communicated, and the fans (14) are used for conveying hot air in the hot air channel (11) of the dryer (1) to the drying towers (13); the two waste gas channels (12) are positioned at two sides of a hot air channel (11) of the dryer (1), and the waste gas channels (12) are arranged corresponding to the drying tower (13).

Technical Field

The invention belongs to the technical field of grain drying equipment, and particularly relates to a continuous grain heat pump drying system.

Background

The guarantee of the grain safety is the first major thing in China and is also the central importance of the development of the economic society. With the full-force promotion of agriculture production in China, the investment on key links of agriculture production is increased, the mechanical level of weak links is improved, the integral production capacity of agriculture is effectively improved, and the comprehensive and healthy development of agriculture production is promoted. From 2011, grain drying equipment is listed in national agricultural machinery subsidy catalogues and mainly subsidized, the stock quantity of the domestic grain drying equipment is rapidly increased by 150% every year, however, the grain drying equipment and environment-friendly heat source equipment are still short boards of Chinese agricultural machines, and the development of Chinese grain drying is far from being suitable for the requirement of grain production development.

At present, bulk coal and diesel oil are adopted as heat sources for drying most grains, and all the bulk coal and the diesel oil belong to high-pollution fuels; although biomass fuels such as straws belong to clean energy, a small amount of pollutants such as sulfide and ash still exist in emissions of the biomass fuels. Meanwhile, if the coal, fuel and gas heat sources cannot be safely stored and used, the safety problems of fire, explosion and the like are easily caused. The automation degree of the coal-fired and fuel-fired drying process is low, the grain drying temperature needs manual intervention, the temperature cannot be accurately controlled, the phenomena of grain discoloration, scorching, crack generation and the like can be caused, and the quality is reduced; the drying process system using the fire coal, the fuel oil and the biomass as heat sources needs to be equipped with dedicated firemen, fuel is added manually, labor cost is high, and in addition, the unit price of the existing raw materials such as the fire coal, the fuel oil, the fuel gas and the biomass is high, heat efficiency is converted in the raw materials, energy efficiency ratio is low, energy cost is high, and energy cost is difficult to break through.

The air energy heat pump technology is an energy-saving and environment-friendly heating technology established based on the reverse Carnot cycle principle, low-temperature heat in the surrounding environment is absorbed, the low-temperature heat is efficiently collected and integrated by a system to form a high-temperature heat source, the high-temperature heat source is used for heating and drying, the high-temperature heat source is heating equipment with higher energy efficiency in the world at present, the high-temperature heat source has obviously higher safety, heating efficiency and energy efficiency ratio than heat sources such as coal, fuel oil, gas, biomass and the like, and nearly 4 parts of electric energy heat can be obtained when the air energy heat pump consumes one part of electric energy. Under the condition of consuming the same heat quantity, the air energy heat pump saves about 50% of the cost of fire coal and about 80% of the cost of fuel oil, and has very considerable economic benefit. However, because the air source heat pump has higher requirements on the quality of ambient air, the unit blockage is easily caused due to higher content of ambient dust, most of the applications in the market are processes for absorbing the heat of the ambient air by the air energy heat pump to supply heat to the drying equipment in a one-way mode, the heat absorption conversion characteristic of the air energy heat pump is not fully exerted, particularly, the application on large continuous grain drying equipment is not good, and the research on the adoption of the air energy heat pump for efficient heat supply so as to be suitable for the large continuous grain drying equipment has great significance.

Disclosure of Invention

The invention provides a continuous grain heat pump drying system, which aims to solve the problems that in the prior art, an air energy heat pump absorbs the heat of the air in the external environment to supply heat to drying equipment in a one-way mode, and the waste heat of the drying equipment is not recycled, so that the heat supply efficiency and the energy efficiency are low.

In order to solve the technical problem, the invention adopts the following technical scheme that the continuous grain heat pump drying system comprises a dryer, a plurality of air energy heat pumps, a total hot air pipe, a pulse dust collector, a settling chamber and a hot air room;

the hot air room is arranged above the settling chamber, the air inlet of the pulse dust collector is communicated with the upper part of the settling chamber, the air outlet of the pulse dust collector is communicated with the hot air room, the air energy heat pumps are arranged in the hot air room, the hot air outlets of the air energy heat pumps are communicated with a main hot air pipe, the hot air outlet of the main hot air pipe is communicated with a hot air channel of the dryer, and the waste air channel of the dryer is communicated with the settling chamber;

the hot blast room is provided with an exhaust blast cap and an air supply blast cap which are communicated with the outside, the exhaust blast cap is communicated with a cold air outlet of the air energy heat pump, the air supply blast cap is communicated with the hot blast room, and an air inlet of the air supply blast cap is higher than the cold air outlet of the exhaust blast cap.

Preferably, a plurality of material blocking structures are arranged in the settling chamber and are sequentially arranged along the tail gas flow direction in the settling chamber, an air flow gap is formed between the bottom end of each material blocking structure and the bottom of the settling chamber, and an air flow gap is formed between the top end of each material blocking structure and the upper portion of the settling chamber. Can prolong the stroke of dusty tail gas on the one hand, on the other hand can directly reduce the flow velocity of dust, promotes the dust and subsides the effect, and because of the relative air of dust unit weight is great, the dust subsides under the action of gravity, and the stroke is longer more, and it is better to subside the effect, and in addition keep off the material structure and can reduce dust speed and change dust direction, promote the dust and subside the effect.

Preferably, the material blocking structure comprises a baffle plate, and the baffle plate is fixedly connected with the settling chamber. Simple structure and convenient processing and manufacturing.

Preferably, the material blocking structure comprises a flexible blocking section and a rigid blocking section which are sequentially connected, the flexible blocking section is fixedly connected with the settling chamber, the rigid blocking section is fixedly connected with the settling chamber through a rope, and the rope is located at the corresponding airflow gap. The whole material blocking structure swings back and forth in a wave manner under the impact of the dust-containing tail gas, so that on one hand, tail gas airflow can be buffered, the material blocking structure can better reduce the dust speed, effectively shake off the dust, and further improve the dust settling effect; on the other hand, dust adhesion of high temperature and high humidity is effectively prevented from being accumulated on the material blocking structure, and the cleaning and maintenance cost of the system is reduced.

Preferably, the flexible blocking section is made of rubber, plastics, foam or non-woven fabrics. The flexible blocking section is combined with the rigid blocking section, so that the flexible blocking section has certain flexibility and certain supporting rigidity, the material of the flexible blocking section also has certain flexibility and certain structural strength, the dust-containing tail gas can better impact the blocking structure to reduce the speed, and the cost is lower.

Furthermore, the number of the pulse dust collectors is multiple, the pulse dust collectors are arranged in the hot air room, and the pulse dust collectors are sequentially arranged in a direction perpendicular to the tail gas flow direction of the settling chamber; and the plurality of air energy heat pumps are also sequentially arranged in a direction perpendicular to the tail gas flow direction of the settling chamber. The plurality of air energy heat pumps and the plurality of pulse dust collectors are reasonably distributed, so that the working efficiency of each pulse dust collector is improved, the uniformity of mixed air flow in a hot air room is improved, and the working efficiency of each air energy heat pump and each pulse dust collector is improved; the great impurity in the dry tail gas can effectively be clear away to the deposit room, and the pulse dust remover is as two dust collecting equipment, can effectively clear away tiny impurity in the dry tail gas, and utilizes the pulse effect can effectively clear away the difficult jam of dust impurity in the pulse dust remover, has solved and has directly set up current filter screen and has filtered easy jam, and is difficult to clear up the problem that influences equipment normal operating after blockking up.

Furthermore, the number of the exhaust hoods is opposite to the number of the air-source heat pumps, an air supply grid is arranged at an air inlet of each air supply hood, and the air supply grid is far away from the exhaust hoods. The external air entering the hot air room from the air supply grille and the purified drying tail gas are subjected to heat conversion through the air energy heat pump together, the air energy heat pump absorbs heat energy in the mixed low-temperature air and converts the heat energy into a part of high-temperature hot air, the part of hot air enters a hot air duct of the dryer under the action of the fan to be dried, and the air energy heat pump also obtains a part of cold air with the temperature lower than the ambient temperature and discharges the cold air into the external atmosphere from the exhaust hood through a pipeline; exhaust hood and tonifying qi grid set up completely independently, and the tonifying qi grid is higher than and keep away from the setting of exhaust hood, the temperature is lower because of the air, the unit weight is big more, so cold air can sink, thereby avoid air energy heat pump exhaust cold air directly to get into hot-blast room through tonifying qi grid, realize the higher heat utilization ratio of air energy heat pump, hot-blast room relatively confined structure has ensured 100% (heat dissipation such as settling chamber and hot-blast room are less can neglected) recycle of stoving tail gas waste heat, the heat utilization ratio of this system reaches the highest.

Furthermore, the dryer comprises two continuous drying towers and two fans, the two fans are positioned on two sides of a hot air duct of the dryer, the two drying towers are mutually communicated, and the fans are used for conveying hot air in the hot air duct of the dryer to the drying towers; the two waste gas channels are positioned at two sides of a hot air channel of the dryer, and the waste gas channels are arranged corresponding to the drying tower. The dryer has reasonable and reliable structural design, the continuous drying tower adopts centralized heat supply, hot air outlets of a plurality of air energy heat pumps are communicated with a hot air channel of the dryer after being collected by a total hot air pipe, the plurality of air energy heat pumps work simultaneously to supply heat, a hot air room is shared, mixed air in the hot air room randomly enters each air energy heat pump, and the wind resistance of the system can be reduced; and a plurality of air energy heat pumps work simultaneously to supply heat for the continuous drying tower, so that the heat supply power is improved, and the air energy heat pumps are suitable for large-scale drying machines.

Has the advantages that:

(1) according to the continuous grain heat pump drying system, the exhaust hood and the air supply grating are completely and independently arranged, the air inlet of the air supply hood is higher than the cold air outlet of the exhaust hood, and the lower the temperature of the air is, the larger the volume weight is, the cold air can sink, so that the cold air discharged by the air energy heat pump can be prevented from directly entering the hot air room through the air supply hood, the higher heat utilization rate of the air energy heat pump is realized, the relatively closed structure of the hot air room ensures that 100% of the waste heat of the drying tail gas (the heat dissipation of a settling chamber, the hot air room and the like is less negligible) can be recycled, the heat utilization rate of the system is highest, the effect of the air energy heat pump is exerted to the maximum extent, and the drying efficiency is improved;

(2) according to the continuous grain heat pump drying system, hot air outlets of a plurality of air energy heat pumps are communicated with a hot air channel of a dryer after being collected through a main hot air pipe, the plurality of air energy heat pumps work simultaneously to supply heat and share a hot air chamber, mixed air in the hot air chamber randomly enters each air energy heat pump, the wind resistance of the system can be reduced, and since outside air enters the hot air chamber through an air supplementing grid, a pipeline for conveying air volume is avoided, so that the local wind resistance is reduced, the wind resistance of the system is relatively small, and the air energy heat pumps and a pulse dust collector are correspondingly arranged, the flow path of wind is reduced, and the wind resistance of the system can also be reduced; the multiple air energy heat pumps work simultaneously to supply heat for the continuous drying tower, so that the functions of the air energy heat pumps are exerted to the maximum extent, the drying efficiency is improved, the heat supply power is improved, and the continuous drying tower is suitable for large-scale dryers;

(3) according to the continuous grain heat pump drying system, the plurality of baffles are sequentially arranged along the airflow direction in the settling chamber, an airflow gap is formed between the bottom end of the front baffle and the bottom of the settling chamber, an airflow gap is also formed between the top end of the adjacent rear baffle and the upper part of the settling chamber, and the drying tail gas entering the settling chamber sequentially impacts the baffles, so that on one hand, the stroke of the dust-containing tail gas can be prolonged, on the other hand, the flowing speed of dust can be directly reduced, and the flowing direction of the dust can be changed, so that the dust settling effect is improved, and the settling chamber mainly removes larger impurities in the drying tail gas; after the drying tail gas is settled and dedusted by the settling chamber, the drying tail gas enters the pulse deduster for secondary dedusting, the pulse deduster mainly removes fine impurities in the drying tail gas, and the dust impurities in the pulse deduster can be effectively removed by using the pulse effect, so that the pulse deduster is not easy to block, and the problems that the conventional filter screen is directly arranged for filtering and is easy to block, and the normal operation of equipment is influenced due to the difficulty in cleaning after the blockage are solved;

(4) according to the continuous grain heat pump drying system, the material blocking structure comprises the flexible blocking section and the rigid blocking section which are sequentially connected, the flexible blocking section is fixedly connected with the settling chamber, the rigid blocking section is fixedly connected with the settling chamber through the rope, the rope is located at the corresponding airflow gap, and the whole material blocking structure swings back and forth in a wave manner under the impact of dust-containing tail gas, so that on one hand, tail gas airflow can be buffered, the dust speed is reduced better by the material blocking structure, dust is effectively shaken off, and the dust settling effect is further improved; on the other hand, dust adhesion of high temperature and high humidity is effectively prevented from being accumulated on the material blocking structure, and the cleaning and maintenance cost of the system is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic side view of a continuous grain heat pump drying system of embodiment 1 of the present invention;

FIG. 2 is a schematic top view of embodiment 1 of the continuous grain heat pump drying system of the present invention;

FIG. 3 is a schematic side view of the settling chamber of embodiment 2 of the continuous grain heat pump drying system of the present invention;

in the figure: theThe arrow indicates the direction of flow of the dust-laden exhaust gas, theArrows indicate the flow direction of the outside air, theThe arrows indicate the direction of the mixed air flow, whichArrows indicate the direction of the cold air flow, theArrows indicate hot air flow direction;

in the figure: 1. the device comprises a dryer, 11, a hot air duct, 12, a waste air duct, 13, a drying tower, 14, a fan, 2, an air energy heat pump, 3, a total hot air duct, 4, a pulse dust collector, 5, a settling chamber, 51, an air flow gap, 52, a baffle, 53, a flexible blocking section, 54, a rigid blocking section, 55, a rope, 6, a hot air room, 61, an exhaust hood, 62, an air supply hood, 621 and an air supply grille.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 and 2, a continuous grain heat pump drying system comprises a dryer 1, a plurality of air energy heat pumps 2, a total hot air pipe 3, a pulse dust collector 4, a settling chamber 5 and a hot air room 6; the hot air room 6 is arranged above the settling chamber 5, the air inlet of the pulse dust collector 4 is communicated with the upper part of the settling chamber 5, the air outlet of the pulse dust collector 4 is communicated with the hot air room 6, the air energy heat pump 2 is arranged in the hot air room 6, the air inlet of the air energy heat pump 2 is communicated with the hot air room 6, the hot air outlets of the air energy heat pumps 2 are all communicated with the main hot air pipe 3, the hot air outlet of the main hot air pipe 3 is communicated with the hot air duct 11 of the dryer 1, and the waste air duct 12 of the dryer 1 is communicated with the settling chamber 5; be provided with exhaust hood 61 and tonifying qi hood 62 with external intercommunication on the hot-blast room 6, exhaust hood 61 and air energy heat pump 2's cold wind export intercommunication, tonifying qi hood 62 and hot-blast room 6 intercommunication, tonifying qi hood 62's air intlet is higher than the cold wind export setting of exhaust hood 61.

In order to improve the dust settling effect of the settling chamber 5, in this embodiment, as shown in fig. 1, a plurality of material blocking structures are arranged in the settling chamber 5, the plurality of material blocking structures are sequentially arranged along the tail gas flow direction in the settling chamber 5, an air flow gap 51 is formed between the bottom end of the former material blocking structure and the bottom of the settling chamber 5, and an air flow gap 51 is also formed between the top end of the adjacent latter material blocking structure and the upper part of the settling chamber 5; specifically, the baffle structure comprises a baffle plate 52, and the baffle plate 52 is fixedly connected with the settling chamber 5; (ii) a In order to facilitate the periodic cleaning of the settling chamber 5 of dust, the settling chamber 5 is provided with a dust cleaning door.

In order to improve the dust removal effect of the continuous grain heat pump drying system, improve the uniformity of the mixed air flow in the hot air room 6 and improve the work efficiency of each air energy heat pump 2 and the pulse dust collector 4, in this embodiment, as shown in fig. 2, the number of the pulse dust collectors 4 is multiple, the pulse dust collectors 4 are arranged in the hot air room 6, and the multiple pulse dust collectors 4 are sequentially arranged in a direction perpendicular to the tail gas flow direction of the settling chamber 5; and a plurality of air energy heat pumps 2 are also sequentially arranged in a direction perpendicular to the tail gas flow direction of the settling chamber 5.

In order to maximize the heat utilization rate of the continuous grain heat pump drying system, in this embodiment, as shown in fig. 1, the number of the exhaust hoods 61 is set opposite to the number of the air energy heat pumps 2, an air inlet of the air supply hood 62 is provided with an air supply grille 621, and the air supply grille 621 is set away from the exhaust hoods 61.

In this embodiment, as shown in fig. 2, the dryer 1 includes two continuous drying towers 13 and two fans 14, the two fans 14 are located at two sides of the hot air duct 11 of the dryer 1, the two drying towers 13 are communicated with each other, and the fans 14 are used for conveying hot air in the hot air duct 11 of the dryer 1 to the drying towers 13; the two exhaust gas ducts 12 are located at two sides of the hot air duct 11 of the dryer 1, and the exhaust gas ducts 12 are arranged corresponding to the drying tower 13.

The working principle is as follows:

firstly, high-temperature dust-containing drying tail gas generated by the drying tower 13 is discharged into the settling chamber 5 from the waste gas duct 12, because the plurality of baffles 52 are sequentially arranged along the airflow direction in the settling chamber 5, an airflow gap 51 is formed between the bottom end of the previous baffle 52 and the bottom of the settling chamber 5, and an airflow gap 51 is also formed between the top end of the adjacent next baffle 52 and the upper part of the settling chamber 5, the drying tail gas entering the settling chamber 5 sequentially impacts the baffles 52, on one hand, the stroke of the dust-containing tail gas can be prolonged, on the other hand, the flow speed of the dust can be directly reduced, and the flow direction of the dust can be changed, so that the dust settling effect is improved, and the settling chamber 5 mainly removes larger impurities in the drying tail gas; after the drying tail gas is settled and dedusted by the settling chamber 5, the drying tail gas enters the pulse deduster 4 for secondary dedusting, the pulse deduster 4 mainly removes fine impurities in the drying tail gas, the dust impurities in the pulse deduster 4 can be effectively removed by using the pulse effect, the pulse deduster 4 is not easy to block, and the problems that the conventional filter screen is directly arranged for filtering, the blockage is easy to occur, and the normal operation of equipment is influenced due to the difficulty in cleaning after the blockage are solved;

the high-temperature clean hot air dedusted by the pulse deduster 4 enters the hot air room 6 and is mixed with the outside air entering the hot air room 6 from the air supply grille 621, then the heat energy is converted by the air-source heat pump 2, the air-source heat pump 2 absorbs the heat energy in the mixed low-temperature air and converts the heat energy into a part of high-temperature hot air, the hot air enters a hot air duct 11 of the dryer 1 and a drying tower 13 in sequence to be dried under the action of a fan 14, high-temperature dust-containing drying tail gas generated by the drying tower 13 is discharged into a settling chamber 5 from a waste gas duct 12 to be subjected to heat circulation, hot air outlets of a plurality of air energy heat pumps 2 are communicated with the hot air duct 11 of the dryer 1 after being gathered through a total hot air pipe 3, the plurality of air energy heat pumps 2 work for heat supply at the same time and share the hot air chamber, mixed air in the hot air chamber randomly enters each air energy heat pump 2, and the wind resistance of the system can be reduced; and a plurality of air energy heat pumps 2 work simultaneously to supply heat as the continuous drying tower 13, so that the heat supply power is improved, and the air energy heat pumps are suitable for a large-scale dryer 1;

and the air energy heat pump 2 also obtains a part of cold air with the temperature lower than the ambient temperature, the cold air is discharged to the outside atmosphere from the exhaust hood 61 through a pipeline, the exhaust hood 61 and the air supply grating 621 are completely and independently arranged, and the air supply grating 621 is higher than and far away from the exhaust hood 61, the lower the temperature of the air is, the larger the volume weight is, the cold air can sink, so that the cold air discharged by the air energy heat pump 2 is prevented from directly entering the hot air room 6 through the air supply grating 621, the higher heat utilization rate of the air energy heat pump 2 is realized, the relatively closed structure of the hot air room 6 ensures that 100 percent (the heat dissipation of the settling chamber 5, the hot air room 6 and the like is negligible) of the waste heat of the drying tail gas is recycled, and the heat utilization rate of the system reaches the highest.

Example 2

As shown in fig. 3, in the present embodiment, the difference from embodiment 1 is that the blocking structure includes a flexible blocking section 53 and a rigid blocking section 54 which are connected in sequence, the flexible blocking section 53 is fixedly connected with the settling chamber 5, the rigid blocking section 54 is fixedly connected with the settling chamber 5 through a rope 55, and the rope 55 is located at the corresponding airflow gap 51; the flexible blocking section 53 of this embodiment is made of rubber, plastic, foam or non-woven fabric. The flexible blocking section 53 of the embodiment has certain flexibility and certain supporting rigidity by combining with the rigid blocking section 54, and the flexible blocking section 53 is made of a material which has certain flexibility and certain structural strength, so that the dust-containing tail gas can better impact the blocking structure to reduce the speed, and the cost of the flexible blocking section 53 is lower; the whole material blocking structure of the embodiment swings back and forth in a wave manner under the impact of the dust-containing tail gas, so that on one hand, tail gas airflow can be buffered, the material blocking structure can better reduce the dust speed, the dust can be effectively shaken off, and the dust settling effect can be further improved; on the other hand, dust adhesion of high temperature and high humidity is effectively prevented from being accumulated on the material blocking structure, and the cleaning and maintenance cost of the system 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 able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.