CN107246767A - A kind of partial air removal moisture drying Split hot pump drying system - Google Patents

Abstract

A kind of partial air removal moisture drying Split hot pump drying system that the present invention is provided, including source pump and drying cycles wind system for partial air removal moisture drying.Overcome shortcoming present in prior art, there is provided a set of low energy consumption partial air removal moisture drying Split hot pump drying system that disclosure satisfy that dry production requirement on the basis of existing production technology and drying plant structure type is not changed.The drying process system is applicable to the production processes such as the food with same dried technique and drying plant structure type, medicinal material, has the advantages that dry air quantity is big, windage is small, energy consumption is low, yield is high in hothouse.Be characterized in, source pump be arranged on hothouse outside, only in hothouse partial air dehumidify, the air drag of drying cycles wind system is not influenceed, it is ensured that hothouse can systemic circulation air quantity, improve rate of drying.

Description

Partial air dehumidification and drying split heat pump drying system

technical field

The invention relates to a heat pump drying system suitable for the drying production process of food, fruits and vegetables, Chinese medicinal materials, wood, sugar processing and other products, belonging to the field of heat pump drying.

Background technique

With the continuous increase of the intensity of environmental governance in our country, the continuous enhancement of environmental protection awareness and the increasingly stringent and standardized requirements of the state for energy conservation and emission reduction of enterprises, more and more attention has been paid to the selection of drying equipment and the promotion of new products. The coal-fired hot blast stove drying method has been banned, but the current drying heat pump drying unit still has the disadvantages of difficult installation, small circulating air volume, unstable operation, and high energy consumption. Further improvements are needed to meet the process and yield requirements for product production.

After retrieval, the closed-loop dehumidification heat pump drying system applied for by application number CN2013207171257 and the heat pump dryer and system for hawthorn cake and sugar cubes applied by CN2016101686474 all adopt the method of dehumidification and drying with full air volume, although they can well meet the drying process requirements. However, since all the air used for drying has to be dehumidified and heated by the heat pump system, when the circulating air volume is large, the resistance of the air circulation system is greatly increased, the power consumption of the fan is increased, and the energy-saving advantages of the heat pump are not well utilized. , and cannot meet the requirements of the large air volume drying process. Application number CN2015107361274 applied for a closed heat pump drying system and CN2015207694032 applied for a regenerative heat pump drying system, which separates the heat pump unit from the outside world, reduces the heat loss of the system, and has an energy-saving effect, but the installation of the equipment is complicated and the investment The cost is high, and it cannot meet the high air volume requirements of some food drying. Application number CN2016106778468 applies for a two-way air supply heat pump drying system, through the independent setting of two sets of moisture exhaust outlets and fresh air outlets, which effectively reduces the energy loss after the exhaust air is heated and then discharged, ensuring the normal operation of the unit in a low temperature environment. However, this arrangement of air ducts will make the air supply in the drying chamber uneven, resulting in higher air temperature in the upper part of the drying chamber and lower temperature in the lower part, which is not conducive to the uniform drying of materials. Application number CN2015204461666 applies for a horizontal airflow type heat pump drying system that overcomes the problems of uneven drying in the drying chamber and unguaranteed color quality caused by small air supply volume. However, this system is only suitable for the processing of products dried by a single-air duct system, and cannot meet the technical requirements of products that require double-air ducts to be shaped first and then dried. Application number CN2015103764238 applies for a dehumidifying heat pump drying system with a bypass air channel. A bypass air channel is added to the air channel system, and the temperature and air volume of the drying room are adjusted through the air valve, which improves the production capacity. However, the air valve in the bypass air duct of this drying system needs to be manually adjusted, and cannot be adjusted automatically according to climate changes. Due to the large changes in the temperature and humidity of the external environment in each season, the system cannot change the bypass flow in time, which will lead to a sudden drop in production , and the air supply mode of the drying room adopts the way of sending up and down, which is not suitable for the food processing industry with large-scale production. Contents of the invention

The task of the present invention is to overcome the shortcomings in the prior art, and provide a set of low-energy partial air dehumidification split heat pump drying system that can meet the requirements of drying production without changing the existing production process and the structure of the drying workshop. The drying system can be applied to the drying production process of food and medicinal materials with the same drying process and drying workshop structure. Low, uniform air supply, can meet the production process requirements and output requirements and other advantages.

For realizing task of the present invention, its technical solution is:

A split-type heat pump drying system for partial air dehumidification and drying includes a heat pump unit for partial air dehumidification and drying and a drying circulating air system. The heat pump unit for partial air dehumidification and drying includes a heat pump main unit, a heat pump group A condenser, a condensation fan, a heat pump group B condenser, a heat pump evaporator group, a heat pipe condenser, a heat pipe evaporator, a heat pump induced draft fan, and a water retaining fan. Plate, water tray, heat pump air inlet, heat pump air outlet. There are several heat pump hosts, which respectively form heat pump refrigerant cycle units with heat pump group A condenser, heat pump group B condenser, and heat pump evaporator group, and constitute several heat pump refrigerant cycle units. Each unit should be configured according to needs. Auxiliary refrigeration accessories for flow valves, dry filters, liquid receivers, oil separators, high and low pressure controllers. A condensing fan is installed on the heat pump group A condenser. The heat pipe evaporator and the heat pipe condenser are respectively installed on the air inlet side and the air outlet side of the evaporator group. The heat pipe evaporator and the heat pipe condenser are connected to form a heat pipe circuit, which is used to recover the residual energy of the air entering the heat pump unit and reduce the heat loss of the heat pump unit. power consumption.

The drying circulating air system includes drying chamber A, drying chamber B, air circulation power and heating chamber, drying chamber A and drying chamber B are separated by partition walls respectively, and air circulation power and heating chamber are equipped with guides against the direction of air flow in sequence. Fan machine, auxiliary electric heater group, heat pump group A condenser, blower, the air passes through the induced draft fan before entering drying room A and drying room B, and is divided by air guides to ensure uniform air supply on both sides. The heat pump air outlet is set on the top between the heat pump group A condenser and the blower in the air circulation power and heating room, and is connected with the heat pump air outlet. The air dehumidified and heated by the heat pump enters the dry circulating air system through the heat pump air outlet. The hot air inlet is set at the return air end of the air circulation power and heating room or at the return air end of the drying room, connected with the heat pump air inlet, and used to introduce the humid air with high water content in the drying room into the heat pump unit. The heat pump group A condenser is installed between the auxiliary electric heater and the heat pump air outlet to heat the air before it is sent into the drying room. The material inlet door and the material outlet door are arranged at both ends of the drying chamber, which are used for the passage of the dried material. The material inlet door, the material outlet door and the thermal insulation wall form a sealed space except for the exhaust outlet of the heat exhaust fan. The drying room is equipped with a heat exhaust fan near the end of the return air, which is used to remove excess heat in the system and ensure the stable operation of the heat pump unit. The auxiliary electric heater group is used for auxiliary air heating equipment equipped with insufficient heat in cold weather conditions or when the unit is turned on. At the same time, it is also used to reduce the fluctuation of the air supply temperature in the drying room when the drying process door is opened. Several blower units and induced draft units can be installed separately to ensure sufficient air supply volume and uniformity of air supply.

In the partial air dehumidification and drying split-type heat pump drying system, since the heat pump unit is installed outside the drying room, it only dehumidifies part of the air in the drying room without affecting the air resistance of the drying circulating air system, which can ensure that the drying room can be large. The circulating air volume improves the drying rate.

Description of drawings

Fig. 1 is a vertical schematic diagram of the assembly of a heat pump unit used in a partial air dehumidification and drying process according to an embodiment of the present invention.

Fig. 2 is a schematic plan view of a partial air dehumidification and drying system according to an embodiment of the present invention.

In the figure: 1-material outlet door, 2-inlet air duct of drying room, 3-induction fan unit, 4-auxiliary electric heater group, 5-heat pump group A condenser, 6-condensing fan, 7-heat pump air outlet Road, 8-blowing unit, 9-drying room/setting room return air door, 10-material inlet door, 11-heat pump air inlet, 12-water tray, 13-heat pipe evaporator, 14-heat pump evaporator group, 15 -Water baffle, 16-heat pipe condenser, 17-heat pump group B condenser, 18-heat pump main unit, 19-heat pump induced draft fan, 20-insulation wall, 21-heat pump air inlet, 22-exhaust heat fan, 23- Heat pump air outlet, 24-partition wall, 25-air guide body.

detailed description

The technical solutions of the present invention will be described below through specific embodiments in conjunction with the accompanying drawings.

A split-type heat pump drying system for partial air dehumidification and drying includes a heat pump unit for partial air dehumidification and drying and a drying circulating air system. The heat pump unit for partial air dehumidification and drying, please refer to FIG. 1 , which includes a heat pump host 18, a heat pump group A condenser 5, a condensing fan 6, a heat pump B group condenser 17, a heat pump evaporator group 14, and a heat pipe condenser 16. Heat pipe evaporator 13, heat pump induced draft fan 19, water baffle 15, water receiving tray 12, heat pump air inlet duct 11, heat pump air outlet duct 7. There are several heat pump hosts 18, which respectively form heat pump refrigerant cycle units with heat pump group A condenser 5, heat pump group B condenser 17, and heat pump evaporator group 14, forming several heat pump refrigerant cycle units. It should be equipped with auxiliary refrigeration accessories including throttle valve, dry filter, liquid receiver, oil separator, high and low pressure controller. A condenser fan 6 is arranged on the condenser 5 of the heat pump group A. The heat pipe evaporator 13 and the heat pipe condenser 16 are respectively installed on the air inlet side and the air outlet side of the heat pump evaporator group 14, and the heat pipe evaporator 13 and the heat pipe condenser 16 are connected to form a heat pipe circuit, which is used to recover the residual air entering the heat pump unit. can reduce the power consumption of the heat pump unit.

Described drying circulating air system, please refer to Fig. 2, and in conjunction with Fig. 1, comprises drying room A, drying room B and air circulation power and heating room, drying room A and drying room B are separated by dividing wall 23 respectively, and air circulation In the power and heating room, the induced draft fan 3, the auxiliary electric heater group 4, the condenser 5 of the heat pump group A, and the blower 8 are sequentially installed against the direction of air flow. The guide body 24 divides the flow to ensure that the air supply on both sides is even. The heat pump air outlet 22 is arranged on the top of the air circulation power and heating chamber, before the blower 8, and is connected with the heat pump air outlet 7. The air dehumidified and heated by the heat pump enters the dry circulating air system through the heat pump air outlet 22. The hot air inlet 21 is set at the end of the air circulation power and the return air of the heating chamber or at the end of the return air of the drying chamber, connected with the heat pump air inlet 11, and used to introduce the humid air with high water content in the drying chamber into the heat pump unit. The heat pump group A condenser 5 is installed between the auxiliary electric heater 4 and the heat pump air outlet 22, and is used for heating the air before being sent into the drying chamber. A material inlet door 10 and a material outlet door 1 are arranged at both ends of the drying chamber for the passage of the dried material. The material inlet door 10, the material outlet door 1 and the thermal insulation wall 20 form a sealed space except for the air exhaust port of the heat exhaust fan. The drying room is equipped with a heat exhaust fan near the end of the return air, which is used to remove excess heat in the system and ensure the stable operation of the heat pump unit. The auxiliary electric heater group 4 is used for auxiliary air heating equipment equipped with insufficient heat in cold weather conditions or when the unit is started, and at the same time, it is also used for reducing the fluctuation of the air supply temperature of the drying chamber when the drying process door is opened . The blower unit 8 and the induced draft unit 3 can be provided with several units respectively to ensure sufficient air supply volume and uniformity of air supply. In the partial air dehumidification and drying split-type heat pump drying system, since the heat pump unit is installed outside the drying room, it only dehumidifies part of the air in the drying room without affecting the air resistance of the drying circulating air system, which can ensure that the drying room can be large. The circulating air volume improves the drying rate.

Claims (2)

1. A split heat pump drying system for partial air dehumidification and drying, including a heat pump unit for partial air dehumidification and drying and a drying circulating air system; the heat pump unit for partial air dehumidification and drying includes a heat pump main unit, heat pump group A condenser, condenser Fan, heat pump group B condenser, heat pump evaporator group, heat pipe condenser, heat pipe evaporator, heat pump induced draft fan, water baffle, water tray, heat pump air inlet, heat pump outlet; there are several heat pump hosts, respectively Together with the heat pump group A condenser, heat pump B group condenser, and heat pump evaporator group, it constitutes a heat pump refrigerant cycle unit, forming several heat pump refrigerant cycle units. Each unit should be equipped with throttle valves, dry filters, Auxiliary refrigeration accessories for liquid receiver, oil separator, high and low pressure controller; heat pipe evaporator and heat pipe condenser are respectively installed on the air inlet side and air outlet side of the evaporator group, and the heat pipe evaporator and heat pipe condenser are connected to form a heat pipe Loop; heat pump group A condenser is equipped with a condensing fan; the drying circulating air system includes drying room A, drying room B and air circulation power and heating room, drying room A and drying room B are separated by a partition wall, air circulation power and heating The indoor is equipped with induced draft fan, auxiliary electric heater group, condenser of heat pump group A, and blower in sequence against the direction of air flow. The top of the circulation power and heating room and before the blower are connected to the heat pump outlet. The air dehumidified and heated by the heat pump enters the dry circulation air system through the heat pump outlet; the hot air inlet is set at the return air end of the air circulation power and heating room or It is installed at the return air end of the drying room and connected with the air inlet of the heat pump; the heat pump group A condenser is installed between the auxiliary electric heater and the heat pump air outlet to heat the air before it is sent into the drying room; materials are set at both ends of the drying room The inlet door and the material outlet door are used for the passage of the dried material; the material inlet door, the material outlet door and the insulation wall form a sealed space except for the exhaust outlet of the heat exhaust fan; the drying room is close to the return air end Alternatively, heat exhaust fans are installed in the air inlet of the heat pump; the auxiliary electric heater group is arranged between the induced draft unit and the condenser of heat pump group A; several sets of blower units and induced draft units can be installed respectively. 2. In the partial air dehumidification and drying split-type heat pump drying system according to claim 1, it is characterized in that the heat pump unit is installed outside the drying room, and only dehumidifies part of the air in the drying room without affecting the drying and circulating air system The air resistance can ensure that the drying room can circulate a large amount of air.