CN112033097A - Side-arranged horizontal-pushing type intelligent heat pump dryer - Google Patents
Side-arranged horizontal-pushing type intelligent heat pump dryer Download PDFInfo
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- CN112033097A CN112033097A CN202010441405.4A CN202010441405A CN112033097A CN 112033097 A CN112033097 A CN 112033097A CN 202010441405 A CN202010441405 A CN 202010441405A CN 112033097 A CN112033097 A CN 112033097A
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- heat pump
- hot air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/063—Movable containers or receptacles, e.g. carts, trolleys, pallet-boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
Abstract
The invention discloses a side flat-pushing type intelligent heat pump dryer, which comprises a tunnel type hot air drying carriage body with an upper layer structure and a lower layer structure, and a side flat-pushing type hot air pushing system, an auxiliary electric heating system, a heat pump heating system, a high-efficiency heat exchange dehumidification and fresh air supply system, a skip material tray system and an automatic control system which are sequentially arranged on the tunnel type hot air drying carriage body. The side-mounted horizontal push type intelligent heat pump dryer provided by the invention can realize 18-section programming drying setting, can accurately control the change of temperature, humidity and wind speed in the drying process, enables materials to be dried highly uniformly and individually, and is more environment-friendly and energy-saving.
Description
Technical Field
The invention relates to a dryer, in particular to a side-mounted horizontal-pushing type intelligent heat pump dryer suitable for drying, processing and producing traditional Chinese medicinal materials.
Background
Generally, hot air drying uses electric heat or steam heat as a drying heat source, and with the development of technology, a more energy-saving and more environment-friendly heat pump technology is introduced into the drying field. The heat pump system has no doubtful environmental protection of toxic waste gas emission (such as CO, CO2, black smoke and the like), has large energy-saving range, can reduce waste heat emission and reduce the impact of waste heat on the environment, and is an extremely environment-friendly green energy source.
The conventional heat pump drying system adopts an internal circulation system, and has two problems in operation: firstly, the temperature of the wet hot air is reduced to a lower degree by the heat pump evaporator so as to condense the moisture in the wet hot air, and the humidity of circulating air is reduced to facilitate drying, so that the cooling and heating loads are heavier, the power consumption of the whole heat pump system is increased, and the operating efficiency of a heat pump is reduced; secondly, a large amount of condensed water is generated in the drying process and discharged to the environment.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the traditional Chinese medicinal material drying equipment and provide a novel side-mounted horizontal push type intelligent heat pump dryer. The side-arranged flat-pushing type intelligent heat pump drying machine can well meet the drying processing requirements of the traditional Chinese medicinal materials with thermal instability, solves the problems of poor drying uniformity, low drying top-grade product rate, low drying efficiency, small adaptability to different medicinal materials, high labor intensity, high energy consumption and the like of the traditional drying method, and improves the environmental protection performance of drying equipment.
In order to achieve the technical purpose, the technical scheme adopted by the invention for solving the technical problem is as follows:
a side-mounted horizontal pushing type intelligent heat pump dryer comprises:
the tunnel type hot air drying carriage body is of an upper-layer structure and a lower-layer structure, an upper air channel is arranged on the upper layer of the tunnel type hot air drying carriage body, a lower air channel is arranged on the lower layer of the tunnel type hot air drying carriage body, a fresh air carriage is arranged at the top of one end of the tunnel type hot air drying carriage body, and fresh air enters from the fresh air carriage and then sequentially passes through an air supply channel, a lower air channel and the upper air channel on the right side of the tunnel type hot air drying carriage body and then is discharged through an air outlet;
an air filter, an electric air valve and a high-efficiency heat exchanger are sequentially arranged in the air supply duct along the wind direction;
the lower air duct is internally provided with the following components in sequence along the wind direction:
a heat pump heating system comprising: the system comprises a heat pump condenser, a heat pump evaporator and a heat pump system, wherein the heat pump condenser is arranged behind an air supply duct on the right side of the tunnel type hot air drying compartment body; the heat pump evaporator is arranged on the right side of the upper air duct and on the upper part of the axial flow fan rack; the heat pump system is arranged in the air supply duct on the right side of the tunnel type hot air drying compartment body, and heat generated in the running process of the unit is directly utilized by the system;
supplementary electric heating system sets up and lies in heat pump heating system left side in wind channel down, includes: the electric heating device comprises a fin tube type electric heater and a fixed support, wherein the fin tube type electric heater is arranged in the lower air duct through the fixed support;
the hot-blast push-type system of side flat-pushing formula sets up and lies in the auxiliary electric heating system left side in wind channel down, includes: the axial flow fan is arranged at the bottom of the lower air duct through the shockproof rack;
skip charging tray system sets up and lies in the wind channel down the hot-blast push-type system left side of side flat push formula includes:
the anti-collision skip car guide rail extends along the wind direction in the lower air duct;
the skip car is arranged on the anti-collision skip car guide rail;
the charging tray is arranged on the charging trolley;
still be equipped with automatic control system in the tunnel type hot air drying railway carriage or compartment body, include:
the integrated sensor comprises a first integrated sensor arranged at the upper and lower air duct joint part at the left end of the tunnel type hot air drying carriage body and a second integrated sensor arranged at the upper and lower air duct joint part at the right end of the tunnel type hot air drying carriage body;
and the signal output end of the programmable controller is in signal connection with the electric air valve, the heat pump heating system, the auxiliary electric heating system and the side horizontal pushing type hot air pushing system.
The tunnel type hot air drying compartment body is a combined stainless steel polyurethane sandwich wallboard, and the combined stainless steel polyurethane sandwich wallboard is formed by combining a single-sided/double-sided stainless steel polyurethane sandwich wallboard and a top plate in a detachable structure.
The skip car and the charging tray are made of stainless steel materials.
And 2 observation sampling windows are arranged at the lower air duct on the tunnel type hot air drying compartment body.
The programmable controller is a PLC.
The integrated sensor is at least integrated with a temperature sensor, a humidity sensor and a wind speed sensor.
Has the advantages that:
the invention adopts the high-efficiency heat exchanger to carry out secondary heat recovery on the wet hot air passing through the evaporator, directly discharges the wet hot air into the atmosphere after the temperature of the wet hot air is reduced to a proper degree, and simultaneously heats the fresh air introduced by the system to a higher temperature and introduces the fresh air into the drying chamber. Therefore, the power consumption of the heat pump system is reduced, the operation efficiency is improved, the discharge of a large amount of condensed water is avoided, and the stability of the operation temperature of the system is improved.
The automatic control system consists of an integrated sensor, an electric control chamber, a Programmable Logic Controller (PLC) arranged on the electric control chamber, a corresponding electric control element and the like; the integrated sensor is at least integrated with a temperature/humidity/wind speed sensor, is arranged at the joint part of the upper air duct and the lower air duct at the left side of the drying tunnel, and is connected with a programmable logic controller PLC arranged on an electric control compartment. The PLC can set up a maximum of 18 drying programs to meet the drying requirements of different materials.
The side-mounted horizontal push type intelligent heat pump dryer provided by the invention can uniformly dry the traditional Chinese medicinal materials with high quality. The temperature, humidity and wind speed of hot wind can be freely adjusted in the process so as to be suitable for different medicinal materials and achieve the process aims of individualized drying requirement and minimized damage to the medicinal materials. In the process, the temperature, the humidity and the wind speed can be monitored, displayed and recorded on line, the whole operation is set and controlled by a PLC, and the device is provided with the functions of fault safety alarm and overrun delay shutdown. Can be widely applied to low-temperature and medium-temperature drying of different traditional Chinese medicinal materials.
Drawings
Fig. 1 is a schematic front sectional view of a side-mounted horizontal push type intelligent heat pump dryer according to the present invention;
fig. 2 is a schematic side view, sectional structure of the intelligent heat pump dryer with a side horizontal pushing type according to the present invention;
wherein, 1, a carriage door; 2. a movable door shield; 3. a tunnel type hot air drying compartment body; 4-1, skip car; 4-2, a material tray; 4-3, a skip guide rail; 5. fin tube type electric heater; 6. a heat pump condenser; 7. a heat pump evaporator; 8-1, a shockproof rack; 8-2, an axial flow fan; 9. a heat pump system; 10. a high efficiency heat exchanger; 11. an integrated sensor; 12. an electric fresh air valve; 13-1, a fresh air compartment; 13-2, an air filter; 14. an appliance control compartment; 15. a drying chamber; 16. an upper air duct; 17. a programmable controller; 18. a sampling window.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1 and 2, the intelligent heat pump dryer with the side horizontal pushing type is composed of a combined stainless steel polyurethane sandwich wall board, and a side horizontal pushing type hot air pushing system, an auxiliary electric heating system, a heat pump heating system, a high-efficiency heat exchange and dehumidification and fresh air supply system, a material tray system and an automatic control system which are sequentially installed on a combined carriage body.
In this embodiment, the tunnel-type hot air drying compartment 3 is formed by combining a single-sided/double-sided stainless steel polyurethane sandwich wall plate and a top plate together in a detachable structure, and the tunnel-type hot air drying compartment with an upper-layer structure and a lower-layer structure is fixed on a proper ground. The compartment body structure has higher installation flexibility and stronger heat preservation performance, and the specially designed combined structure effectively overcomes the phenomenon of 'heat bridge' commonly existing in the common drying compartment body, so that the heat leakage is obviously reduced, and the energy-saving effect is obviously improved. The flexible combined structure can be installed on site, greatly reduces the transportation volume and reduces the transportation cost.
The side horizontal pushing type hot air pushing system is composed of a shockproof rack 8-1 and an axial flow fan 8-2. The axial flow fan 8-2 is arranged on the shockproof rack 8-1, is positioned on the right side of the carriage body, is arranged on the left side of the fin tube type electric heater 5, and is arranged at the right side air supply end of the drying chamber. The drying chamber is characterized in that the air supply surface is fully distributed on the cross section of the whole drying chamber, so that hot air is pushed to materials in a cross-section advection mode, the materials on the whole cross section can be uniformly and stably dried, and the phenomenon of uneven drying of the upper material and the lower material caused by uneven air supply is eliminated.
The auxiliary electric heating system comprises fin tubular electric heater 5 and fixed bolster, fin tubular electric heater 5 installs on the fixed bolster, is located dry railway carriage or compartment body right side, heat pump condenser left side. The fin tube type electric heater 5 is mainly used as an auxiliary heater of the heat pump system, and performs auxiliary heating in the initial stage of starting the heat pump and in the case of low ambient temperature. The heat exchanger is characterized in that the heat exchanger is arranged on the air supply side of the drying chamber and is fully distributed on the cross section of the whole drying chamber, so that the heat distribution of the cross section of the drying chamber is more uniform and stable. The drying and temperature rising are rapid, the device can be operated in rainy days, and the climate adaptability of the device is good.
The heat pump heating system consists of a heat pump condenser 6, a heat pump evaporator 7 and a heat pump system 9, wherein the heat pump condenser 6 is arranged behind an air supply duct on the right side of the drying compartment body; the heat pump evaporator 7 is arranged on the right side of the upper air duct and on the upper part of the axial flow fan frame; the heat pump system 9 is arranged in the air supply duct on the right side of the carriage body, and heat generated in the running process of the unit can be directly utilized by the system.
The high-efficiency heat exchange, dehumidification and fresh air supply system is composed of a high-efficiency heat exchanger 10, an electric air valve 12, a fresh air compartment 13-1 and an air filter 13-2. The air filter 13-2 and the electric fresh air valve 12 are sequentially arranged on a fresh air compartment 13-1 positioned at the right side end of the dryer compartment body; the high-efficiency heat exchanger 10 is arranged at the right side end of an upper air duct of the compartment body, an upper fresh air inlet of the high-efficiency heat exchanger is connected with an air outlet of a fresh air compartment 13-1, a lower hot fresh air outlet of the high-efficiency heat exchanger is communicated with an air inlet duct of the drying chamber, a wet hot air inlet of the high-efficiency heat exchanger is communicated with an air outlet of an upper air duct heat pump evaporator, and a wet hot air outlet of the high-efficiency heat exchanger;
the automatic control system consists of an integrated sensor 11, an electric control box 14, a programmable controller 17, corresponding electric control elements and the like.
In a preferred embodiment of the present invention, the integrated sensor 11 is a temperature/humidity/wind speed integrated sensor.
As a preferable scheme of the invention, the skip car and the charging tray are made of stainless steel materials.
In a preferred embodiment of the invention, a viewing and sampling window 18 is mounted in the cabinet at a suitable position to facilitate viewing and sampling during the drying process.
The side-mounted horizontal push type intelligent heat pump dryer provided by the invention has the advantages of reasonable structural design, convenience in operation, high automation degree, low working strength, small appearance and color difference of dried medicinal materials, uniform drying degree, energy conservation and environmental friendliness. Compared with the traditional hot air circulation dryer, the drying time can be shortened by 20 percent, the energy consumption is reduced by 30 percent, and the environment-friendly property is excellent.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.
Claims (6)
1. The utility model provides a side flat push formula intelligence heat pump desiccator which characterized in that: the method comprises the following steps:
the tunnel type hot air drying carriage body is of an upper-layer structure and a lower-layer structure, an upper air channel is arranged on the upper layer of the tunnel type hot air drying carriage body, a lower air channel is arranged on the lower layer of the tunnel type hot air drying carriage body, a fresh air carriage is arranged at the top of one end of the tunnel type hot air drying carriage body, and fresh air enters from the fresh air carriage and then sequentially passes through an air supply channel, a lower air channel and the upper air channel on the right side of the tunnel type hot air drying carriage body and then is discharged through an air outlet;
an air filter, an electric air valve and a high-efficiency heat exchanger are sequentially arranged in the air supply duct along the wind direction;
the lower air duct is internally provided with the following components in sequence along the wind direction:
a heat pump heating system comprising: the system comprises a heat pump condenser, a heat pump evaporator and a heat pump system, wherein the heat pump condenser is arranged behind an air supply duct on the right side of the tunnel type hot air drying compartment body; the heat pump evaporator is arranged on the right side of the upper air duct and on the upper part of the axial flow fan rack; the heat pump system is arranged in the air supply duct on the right side of the tunnel type hot air drying compartment body, and heat generated in the running process of the unit is directly utilized by the system;
supplementary electric heating system sets up and lies in heat pump heating system left side in wind channel down, includes: the electric heating device comprises a fin tube type electric heater and a fixed support, wherein the fin tube type electric heater is arranged in the lower air duct through the fixed support;
the hot-blast push-type system of side flat-pushing formula sets up and lies in the auxiliary electric heating system left side in wind channel down, includes: the axial flow fan is arranged at the bottom of the lower air duct through the shockproof rack;
skip charging tray system sets up and lies in the wind channel down the hot-blast push-type system left side of side flat push formula includes:
the anti-collision skip car guide rail extends along the wind direction in the lower air duct;
the skip car is arranged on the anti-collision skip car guide rail;
the charging tray is arranged on the charging trolley;
still be equipped with automatic control system in the tunnel type hot air drying railway carriage or compartment body, include:
the integrated sensor comprises a first integrated sensor arranged at the upper and lower air duct joint part at the left end of the tunnel type hot air drying carriage body and a second integrated sensor arranged at the upper and lower air duct joint part at the right end of the tunnel type hot air drying carriage body;
and the signal output end of the programmable controller is in signal connection with the electric air valve, the heat pump heating system, the auxiliary electric heating system and the side horizontal pushing type hot air pushing system.
2. The side-mounted flat-push intelligent heat pump dryer according to claim 1, characterized in that: the tunnel type hot air drying compartment body is a combined stainless steel polyurethane sandwich wallboard, and the combined stainless steel polyurethane sandwich wallboard is formed by combining a single-sided/double-sided stainless steel polyurethane sandwich wallboard and a top plate in a detachable structure.
3. The side-mounted flat-push intelligent heat pump dryer according to claim 1, characterized in that: the skip car and the charging tray are made of stainless steel materials.
4. The side-mounted flat-push intelligent heat pump dryer according to claim 1, characterized in that: and 2 observation sampling windows are arranged at the lower air duct on the tunnel type hot air drying compartment body.
5. The side-mounted flat-push intelligent heat pump dryer according to claim 1, characterized in that: the programmable controller is a PLC.
6. The side-mounted flat-push intelligent heat pump dryer according to claim 1, characterized in that: the integrated sensor is at least integrated with a temperature sensor, a humidity sensor and a wind speed sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010441405.4A CN112033097A (en) | 2020-05-22 | 2020-05-22 | Side-arranged horizontal-pushing type intelligent heat pump dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010441405.4A CN112033097A (en) | 2020-05-22 | 2020-05-22 | Side-arranged horizontal-pushing type intelligent heat pump dryer |
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| Publication Number | Publication Date |
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| CN112033097A true CN112033097A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010441405.4A Pending CN112033097A (en) | 2020-05-22 | 2020-05-22 | Side-arranged horizontal-pushing type intelligent heat pump dryer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203163459U (en) * | 2013-03-11 | 2013-08-28 | 孙应真 | Intelligent hot air drying control device |
| CN105021013A (en) * | 2014-04-23 | 2015-11-04 | 中国科学院理化技术研究所 | Heat pump drying system with sensible heat recovery function and multi-effect dehumidification function |
| CN205843311U (en) * | 2016-07-26 | 2016-12-28 | 上海筑能环境科技有限公司 | A kind of Novel multifunctional heat pump drying all-in-one |
| CN107202487A (en) * | 2017-05-07 | 2017-09-26 | 青岛大学 | A kind of partial air dehumidifying Analysis of Heat Pump Drying System for high temperature production technology |
| CN107830705A (en) * | 2017-12-11 | 2018-03-23 | 云南师范大学 | A kind of novel high-efficiency and energy-saving heat pump double back heated drying system |
-
2020
- 2020-05-22 CN CN202010441405.4A patent/CN112033097A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203163459U (en) * | 2013-03-11 | 2013-08-28 | 孙应真 | Intelligent hot air drying control device |
| CN105021013A (en) * | 2014-04-23 | 2015-11-04 | 中国科学院理化技术研究所 | Heat pump drying system with sensible heat recovery function and multi-effect dehumidification function |
| CN205843311U (en) * | 2016-07-26 | 2016-12-28 | 上海筑能环境科技有限公司 | A kind of Novel multifunctional heat pump drying all-in-one |
| CN107202487A (en) * | 2017-05-07 | 2017-09-26 | 青岛大学 | A kind of partial air dehumidifying Analysis of Heat Pump Drying System for high temperature production technology |
| CN107830705A (en) * | 2017-12-11 | 2018-03-23 | 云南师范大学 | A kind of novel high-efficiency and energy-saving heat pump double back heated drying system |
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