CN204881113U - Solar energy and heat pump be multi -functional drying system of integration jointly - Google Patents

Abstract

The utility model discloses a multifunctional drying system combining solar energy and a heat pump. The system consists of a solar heat collector, a plurality of valves, a water storage tank, a drying room, a circulating fan, a coil pipe installed on the wall of the drying room, Composed of isolation plate, circulating water pump, condenser, compressor, evaporator, expansion valve, air inlet fan and exhaust fan. This system combines the characteristics of solar energy and heat pump energy supply, and can complete continuous drying operations under different climatic conditions. Through the switching or combination of various energy supply modes, the system can realize solar energy storage heating mode (single), heat pump drying and dehumidification mode (single), solar heat pump combined with energy storage heating mode, a total of three operating modes. The advantage of this system is that the temperature in the drying room is relatively uniform, which overcomes the problems of hot air dead angle and uneven indoor temperature distribution in the traditional drying room, and has a good energy-saving effect. It makes full use of the functions of heat pump and solar energy. When the drying room is not working, It can be used to generate hot water for heat storage and heating, and one machine can be used for multiple purposes, which greatly exerts its functions.

Description

A multifunctional drying system integrating solar energy and heat pump

technical field

The utility model relates to a drying system, in particular to a multifunctional drying system integrating solar energy and a heat pump, which belongs to the technical field of solar heat utilization.

Background technique

my country's energy demand pressure, greenhouse gas emissions and fuel price increases have prompted people to vigorously develop renewable energy. Solar energy is considered as an ideal energy source to solve the current energy crisis and environmental pollution because of its abundant resources and environmental friendliness. With the maturity of solar thermal utilization technology, the connection between the development and utilization of solar energy and people's production and life is getting closer. Among them, solar drying has gradually attracted attention because of its characteristics of energy saving, pollution-free, and environmental friendliness.

Most of the existing solar drying systems collect heat energy through air collectors, and dry by blowing hot air into the drying room. However, due to the small heat capacity of hot air, changes in solar radiation will cause large fluctuations in wind temperature. And it cannot store energy, the drying system cannot use solar energy to dry at night, and the independent solar system lacks drying continuity and stability.

In addition, the traditional hot air drying room also has the problems of hot air dead angle and uneven indoor temperature distribution. Affected by the way materials are stacked, the circulation resistance of hot air in the drying room is relatively large. Especially for drying rooms with unreasonable air inlet and outlet designs, there will often be uneven temperature distribution in the room and even hot air dead ends, resulting in poor or impossible drying of local materials. Drying, which in turn affects the overall dry material quality.

Some heat pump drying systems adopt a split structure, which occupies a large area, affects the appearance, and has no waste heat recovery or poor recovery effect. The high-humidity hot air after drying the material is directly discharged from the drying room, and the remaining heat is not supplied to the heat pump evaporator. Increase the COP of the heat pump, so the energy saving effect is not obvious, especially in the cold season, energy consumption.

In addition, the traditional drying system has a single function, and some materials have obvious seasonality, such as flue-cured tobacco and wild mushrooms, etc. The drying system is basically idle after the drying period, resulting in a long payback period for the drying system and poor economic efficiency.

Contents of the invention

One of the problems to be solved by the technology of the utility model is: to overcome the above-mentioned defects or deficiencies in the existing solar drying technology, and provide a multifunctional drying system integrating solar energy and heat pump. The system combines solar energy with heat pump energy supply, and through the switching or combination of various energy supply modes, it can complete continuous drying operations under different climate conditions, with low operating costs and good energy-saving effects.

The second problem solved by the technology of the utility model is: it overcomes the shortcoming of the single function of the traditional drying system. In the time period when drying is not required, solar collectors and heat pumps can be used to generate hot water to provide heating or domestic water for users, and one machine can be used for multiple purposes, which greatly shortens the investment recovery period.

The technical solution of the utility model is: a multifunctional drying system integrating solar energy and a heat pump, which is characterized in that it includes a solar energy storage heating system and a heat pump drying and dehumidification energy storage system. The solar energy storage heating system includes a solar heat collector, a water storage tank, a circulation pipeline, and a heat exchange coil installed on the inner wall of the drying chamber. The circulation pipeline is composed of a connecting pipeline, a first valve, a second valve, and a third valve. , the first circulating water pump and the second circulating water pump; the heat pump drying and dehumidification energy storage system includes a drying chamber, an isolation plate, a circulating fan, an air inlet fan, an exhaust fan, a compressor, a condenser, an evaporator, an expansion valve, The dehumidification pipe, four-way valve and heat exchanger placed in the water storage tank, the drying room is divided into a material area and a heat pump area.

Compared with the prior art, the utility model has the following advantages:

(1) The utility model uses water as the working medium for heat storage and heat transfer, and the solar heat collector can adopt a low-cost vacuum tube heat collector or a flat plate heat collector that is better combined with a drying chamber according to actual needs. The water temperature fluctuates less with solar radiation, and the water temperature is constant, which can ensure a constant and balanced drying temperature in the drying room. And it has a certain heat storage capacity, and it can still work continuously at night or during the day without solar radiation for a short time.

(2) The utility model arranges heat exchange coils on the wall of the drying room, and the distribution is even, which can ensure that the temperature in the drying room is relatively uniform, and overcomes the problems of hot air dead angle and uneven indoor temperature distribution in the traditional hot air drying room.

(3) The utility model integrates the evaporator and condenser of the heat pump into the drying room, which can make full use of the waste heat of the tail gas after drying the materials, and overcomes the disadvantage of heat loss caused by the exhaust gas being directly discharged outside the traditional drying room, while the heat pump evaporates The device can absorb the waste heat of the exhaust gas after drying the material, improve the COP of the heat pump, and greatly enhance the energy saving effect.

(4) Since the utility model integrates the heating equipment—the heat pump into the drying room, the circulation of the hot air is only carried out independently in the room during the whole drying process, and rarely exchanges heat with the outside world, ensuring a constant indoor temperature and reducing external losses. With less heat, less energy is required to heat the air, making it more energy efficient.

(5) The utility model uses a circulating fan in the drying chamber to strengthen the air flow in the drying chamber, which overcomes the shortcomings of the traditional drying chamber, such as uneven temperature and indoor air flow, and can make the material dry faster and more evenly. good.

(6) The utility model makes full use of the functions of the heat pump and solar energy. When the drying room is not working, it can be used to produce hot water for heat storage and heating. One machine is multi-purpose, which greatly exerts its functions and overcomes the traditional drying room. The disadvantage of being idle in the non-dry season.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the utility model.

Fig. 2 is a front view of the drying chamber of the present invention.

Explanation of reference signs: solar heat collector 1; first valve 2; second valve 3; third valve 4; circulation fan 5; condenser 6; compressor 7; evaporator 8; expansion valve 9; Air inlet 11; Air inlet fan 12; Air outlet 13; Exhaust fan 14; Four-way valve 15; Heat exchange coil 16 installed on the inner wall of the drying chamber; 19; the first circulating water pump 20; the heat exchanger 21 placed in the water storage tank; the drying chamber 22; the isolation plate 23;

Detailed ways

In the following description, various aspects of the invention will be described. For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without the specific details mentioned herein. Furthermore, well-known features may be omitted or simplified in order not to obscure the invention.

With reference to Fig. 1 now, it is that embodiment of the present utility model constitutes and structural representation. The solar energy storage heating system of the present utility model is connected with the water storage tank 19 by the solar heat collector 1 through the first valve 2, the second valve 3 and the first circulating water pump 20 to form a solar energy storage circulation loop; the water storage tank 19 passes through the second The valve 3, the third valve 4 and the second circulating water pump 18 are connected with the heat exchange coil 16 installed on the inner wall of the drying chamber to form a solar heating circulation loop.

In the heat pump drying and dehumidification energy storage system of the present invention, the isolation plate 23 in the drying chamber 22 divides it into the drying area 17 and the area where the heat pump is located; there are circulating fans 5 and heat pump equipment in the area where the heat pump is located.

The circulation fan 5 will force the hot air in the drying chamber 22 to circulate, and then pass through the circulation fan 5-drying area 17-evaporator 8-condenser 6-circulation fan 5, thereby completing a process of heating and drying materials by a heat pump.

The connection working mode of the heat pump equipment is as follows: both ends of the evaporator 8 are respectively connected with the compressor 7 and the expansion valve 9, and the other ends of the compressor 7 and the expansion valve 9 are respectively connected with a four-way valve 15, and the four-way valve 15 It is also connected with the condenser 6 and the heat exchanger 21 placed in the water storage tank 19; by adjusting the closing direction of the four-way valve 15 to complete the switching of the heat pump working mode, the heat pump cycle can be made as the condenser 6-compression Machine 7-expansion valve 9-evaporator 8 to achieve drying and dehumidification mode or make the heat pump cycle work process as evaporator 8-expansion valve 9-compressor 7-to achieve energy storage mode.

The outer surface of the bottom of the evaporator 8 is equipped with a dehumidification device 10. When the humid air passing through the material area 17 passes through the evaporator 8, because the temperature of the outer surface of the evaporator 8 is relatively low, when the humid air reaches its dew point temperature, it will flow in the evaporator. 8, water droplets are precipitated outside, and after the water droplets are collected, they are discharged out of the drying chamber 22 through the dehumidification device 10 to complete the dehumidification process.

An air inlet 11 and an air outlet 13 are provided on the same side wall of the drying chamber 22 .

An air inlet fan 12 is installed on the air inlet; an exhaust fan 14 is installed on the air outlet. When the humidity of the material is too high and the dehumidification load on the evaporator 8 is too heavy, start the exhaust fan 14 to forcibly discharge part of the humid air; .

The utility model has three usage modes: solar energy storage heating mode (single), heat pump drying and dehumidification mode (single), solar heat pump combined energy storage heating mode.

Solar energy storage heating mode (separate): This kind of working mode is in the case of intermittent drying in a short period of time, the solar radiation is good, and the temperature of the material is not high, so it can work without a heat pump and can be completed only by solar energy. Energy saving. The specific working method is: start the first circulating water pump 20, open the first valve 2 and the second valve 3, the water in the water storage tank 19 is transported to the solar heat collector 1 by the first circulating water pump 20 for heating, and the hot water is heated by the solar energy. The circuit formed between the heat collector 1 and the water storage tank 19 stores heat in the water storage tank 19; when the temperature of the hot water in the water storage tank is higher than the temperature in the drying room, the third valve 4 is opened, and part of the hot water enters the installation The coil 6 on the wall of the drying room, the hot water in the coil exchanges heat with the cold air in the room, so that the indoor temperature rises, and the intake fan 12, the exhaust fan 14 and the circulation fan 5 are started, and the hot air passes through the circulation fan. 5 and then enter the drying area 17 through the periphery of the isolation plate 23, and after releasing heat and absorbing the moisture of the material, it is discharged from the air outlet 17 through the exhaust fan 14 located above as shown in Figure 2, and the fresh air passes through the air outlet 17 as shown in Figure 2. The air intake blower 12 shown below enters the drying chamber 22 from the air intake 11 . The second circulating water pump 18 is started, and the cooling water after heat exchange in the coil is transported to the water storage tank 19 through the second circulating water pump 18 .

Heat pump drying and dehumidification mode (separate): This working mode works when the solar resources are not good, such as rainy days, nights or when continuous drying is required, and the material has a high temperature requirement, which cannot be met by solar drying. The specific working method is as follows: in the initial stage, the cold air in the drying chamber 22 is used as a low-temperature heat source for the heat pump cycle, and the cold air in the drying chamber 22 is gradually heated through the heat pump cycle. Start the circulation fan 5, the circulation fan 5 forces the hot air in the drying chamber 22 to circulate, and then passes through the circulation fan 5-the periphery of the isolation plate 23-the drying area 17-the evaporator 8-the condenser 6-the circulation fan 5, thereby completing A heat pump heats the process of drying the material. Wherein, when the humid air passing through the material area 17 passes through the outer wall of the evaporator 8 to precipitate water droplets, the water droplets are collected and then discharged out of the drying chamber 22 through the dehumidification device 10 to complete the dehumidification process. If the humidity of the material is too high, when the dehumidification load on the evaporator 8 is too heavy, start the exhaust fan 14 located above as shown in Figure 2, and forcefully discharge part of the humid air; if the temperature in the drying room is too high, start as shown in Figure 2 As shown, the air intake fan 12 located below is forced into the air to reduce the indoor temperature.

Solar heat pump combined with energy storage heating mode: This mode of operation is to combine solar energy and heat pump to work at the same time during the heating and drying stage. When the system is in the dry season, this mode is equivalent to the heat pump drying and dehumidification mode (independent), plus the solar energy storage heating mode (independent). The specific working method is: start the first circulating water pump 20, open the first valve 2 and the second valve 3, the water in the water storage tank 19 is transported to the solar heat collector 1 by the first circulating water pump 20 for heating, and the hot water is heated by the solar energy. The circuit formed between the heat collector 1 and the water storage tank 19 stores heat in the water storage tank 19; when the temperature of the hot water in the water storage tank is higher than the temperature in the drying room, the third valve 4 is opened, and part of the hot water enters the installation For the coil 6 on the wall of the drying room, the hot water in the coil exchanges heat with the cold air in the room. At the same time, the working mode of the heat pump is switched to the heat pump drying and dehumidification mode by adjusting the closing direction of the four-way valve 15 . The cold air in the drying chamber 22 is heat-supplied by solar energy and a heat pump, so that the cold air in the drying chamber 22 becomes hot rapidly. At this time, start the circulation fan 5, the circulation fan 5 forces the hot air in the drying chamber 22 to circulate, and then passes through the circulation fan 5-the periphery of the isolation plate 23-drying area 17-evaporator 8-condenser 6-circulation fan 5 , to complete a process of heating and drying materials; in addition, start the second circulating water pump 18, and the cooling water after heat exchange in the coil is transported to the water storage tank 19 through the second circulating water pump 18. In the above process, when the humid air passing through the material area 17 passes through the outer wall of the evaporator 8 to precipitate water droplets, the water droplets are collected and then discharged out of the drying chamber 22 through the dehumidification device 10 to complete the dehumidification process. If the humidity of the material is too high and the dehumidification load on the evaporator 8 is too heavy, start the exhaust fan 14 located above as shown in Figure 2 to forcefully discharge part of the humid air; if the temperature in the drying room is too high, start it as shown in Figure 2 Shown in 2 is positioned at the intake fan 12 of below, forced air intake to reduce indoor temperature. When the system is in the non-dry season and does not need to be dried, the energy storage method is adopted, that is, the traditional solar-heat pump hot water system is used to generate hot water for heating or providing domestic water for users. The specific working method is: start the first circulating water pump 20, open the first valve 2 and the second valve 3, the water in the water storage tank 19 is transported to the solar heat collector 1 by the first circulating water pump 20 for heating, and the hot water is passed through The circuit formed between the solar heat collector 1 and the water storage tank 19 stores heat in the water storage tank 19; at the same time, by adjusting the closing direction of the four-way valve 15, the heat pump working mode is switched to the heat pump energy storage mode. Open the expansion valve 9, the refrigerant in the evaporator 8 absorbs the heat in the drying chamber 22 and evaporates continuously, the refrigerant coming out of the evaporator 8 is sucked into the compressor 7, and after being compressed by the compressor 7, the refrigerant enters In the heat exchanger 21 placed in the water storage tank 19 , the refrigerant exchanges heat with the water in the water storage tank 19 and returns to the evaporator 8 through the expansion valve 9 .

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those skilled in the art, without departing from the scope of the technical solutions of the present utility model, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solutions of the present utility model The content of the scheme, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (6)

1. A combined and integrated multifunctional drying system of solar energy and heat pump, comprising a solar energy storage heating system and a heat pump drying dehumidification energy storage system, characterized in that: the circulation pipeline of the solar energy storage heating system is provided with a first valve , the second valve, the third valve, the first circulating water pump, the second circulating water pump, and the third valve is connected to the heat exchange coil installed on the inner wall of the drying chamber, and is provided with a solar collector and a water storage tank Energy storage system; the circulation pipeline of the heat pump drying and dehumidification energy storage system is equipped with a compressor, a condenser, an evaporator, and an expansion valve, and the evaporator is connected with a dehumidification pipe. The other end of the machine and the expansion valve are respectively connected with a four-way valve, and the other end of the four-way valve is connected with the condenser and the heat exchanger placed in the water storage tank. The drying room is equipped with an isolation plate and a circulating fan, and the drying The wall on the same side of the chamber is provided with an air inlet and an air outlet, and an air inlet fan and an exhaust fan are respectively installed on the air inlet and the air outlet. 2. A multifunctional drying system integrated with solar energy and heat pump as claimed in claim 1, characterized in that the solar heating drying adopts the hot water coil method. 3. A multifunctional drying system combining solar energy and heat pump as claimed in claim 1, characterized in that the heat pump drying dehumidification energy storage system is to place the heat pump in the drying room, use the evaporator as the dehumidification device, and set the exhaust wet mouth. 4. A multifunctional drying system integrating solar energy and heat pump as claimed in claim 1, characterized in that a heat exchanger is provided in the water storage tank, and when the drying room is not working, the heat pump can be used to dry, dehumidify and store energy In the system, the working fluid in the evaporator exchanges heat with the water in the water storage tank to realize heat pump energy storage. 5. A multifunctional drying system integrating solar energy and heat pump as claimed in claim 1, characterized in that the drying chamber is provided with a circulation fan, which forces the hot air in the drying chamber to circulate. 6. A multifunctional drying system combining solar energy and heat pumps as claimed in claim 1, characterized in that four-way valves are respectively connected between the compressor and the condenser and between the condenser and the expansion valve. Adjust the closing direction of the four-way valve to complete the switching of the heat pump working mode.