CN107289767A - Tunnel type multistage series heat pump drying system - Google Patents

Abstract

The invention relates to the technical field of heat pump drying, in particular to a tunnel type multi-stage series heat pump drying system. The system includes a solar system, a heat pump circulation system and a drying system, the drying system includes a tunnel drying room, the solar system is a solar fresh air system, the solar system includes a fresh air heating chamber, and the heat pump circulation system includes a plurality of heat pumps system, the condensers of each heat pump system are connected in series to form a multi-stage heating chamber, the evaporators of each heat pump system are connected in series to form a multi-stage dehumidification chamber, and between the multi-stage heating chamber and the multi-stage dehumidification chamber With mixing chamber. The invention can effectively recycle waste heat, reduce the total energy consumption of the system, adopt multi-stage dehumidification to effectively remove moisture in the dry air, and adopt multi-stage heating to meet the large temperature difference between the return air and improve the efficiency of the compressor. dehumidification efficiency.

Description

A tunnel type multi-stage series heat pump drying system

technical field

The invention relates to the technical field of heat pump drying, in particular to a tunnel type multi-stage series heat pump drying system.

Background technique

The application of the heat pump system in the drying field can effectively recover waste heat and reduce drying energy consumption. However, the performance of the existing heat pump system is low in a low temperature environment, and even cannot operate normally, and when the temperature difference between supply and return is large, the existing single-stage heat pump system cannot meet the requirements.

Contents of the invention

(1) Technical problems to be solved

The purpose of the present invention is to provide a tunnel-type multi-stage series heat pump drying system to solve the problem that the existing heat pump system cannot operate normally in a low temperature environment, the performance is low, and the temperature difference between supply and return is large, and the single-stage heat pump system is difficult to meet the requirements. question.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a tunnel-type multi-stage series heat pump drying system, which at least includes a solar system, a heat pump circulation system and a drying system arranged sequentially from top to bottom;

The drying system includes a tunnel drying chamber;

The solar energy system is a solar fresh air system, and the solar fresh air system includes a fresh air heating chamber;

The heat pump circulation system includes a plurality of heat pump systems, the condensers of each heat pump system are connected in series to form a multi-stage heating chamber, the evaporators of each heat pump system are connected in series to form a multi-stage dehumidification chamber, and in the multi-stage heating chamber A mixing chamber is provided between the multi-stage dehumidification chamber, and exhaust ducts are respectively provided on the left and right sides of the mixing chamber;

The multi-stage heating chamber, the mixing chamber and the multi-stage dehumidification chamber are connected sequentially from front to back; The tunnel-type drying chamber is connected; the fresh air heating chamber is connected to the mixing chamber through a hot air inlet, and the mixing chamber is connected to the exhaust duct through an air outlet.

Further, the solar fresh air system includes a light-transmitting heat insulation board, an adsorption structure and a support plate, wherein the support plate is arranged on the adsorption structure, and the light-transmitting heat insulation board is arranged on the support board, so The fresh air heating chamber is surrounded by the above-mentioned light-transmitting heat insulation board, the adsorption structure and the support board.

Specifically, heat storage materials are arranged inside the adsorption structure, and solar energy adsorption materials are arranged on the outer surface of the adsorption structure.

Specifically, a fresh air inlet is provided on the support plate.

Further, the tunnel-type drying chamber is provided with a material inlet and a material outlet, wherein the material outlet is set on the side of the tunnel-type drying room corresponding to the air supply port, and the material inlet is set at The side of the tunnel drying chamber corresponding to the air return port.

Further, a water storage tray is provided in the multi-stage dehumidification chamber, the water storage tray is arranged at the bottom of the evaporator, and an outlet pipe is provided on the water storage tray.

Specifically, a main fan is provided at the air outlet of the multi-stage heating chamber, and the main fan is a variable frequency fan.

Specifically, the hot air inlet is provided with a fresh air valve, and the air outlet is provided with an exhaust valve.

Specifically, a material cart is provided in the tunnel-type drying chamber, and the moving direction of the material cart is opposite to the flow direction of the drying hot air in the tunnel-type drying chamber.

Specifically, the outer enclosure structure of the tunnel-type multi-stage series heat pump drying system adopts polyurethane insulation boards.

(3) Beneficial effects

The technical scheme of the present invention has the following advantages:

The present invention adopts a series-connected multi-stage heat pump system. The evaporators of each heat pump system are connected in series to form a multi-stage dehumidification chamber, and the condensers of each heat pump system are connected in series to form a multi-stage heating chamber. A mixing chamber is set between the chambers, in which, the high-temperature and high-humidity exhaust gas discharged from the tunnel drying chamber is gradually cooled and dehumidified through the multi-stage dehumidification chamber. The heated fresh air is mixed, and the mixed air is heated and heated step by step through the multi-stage heating chamber to realize multi-stage cooling and dehumidification and equal humidity heating, thereby effectively recovering waste heat, reducing the compression ratio of the single-stage compressor in the heat pump system, and improving compressor efficiency.

The invention adopts a continuous tunnel-type drying chamber for material drying, and the moving direction of the material in the tunnel-type drying chamber is opposite to the flow direction of the drying hot air, so as to ensure a certain temperature difference between the sending and returning air, realize the stability of the system during the drying process, and improve the waste heat. recycling and energy efficiency.

The invention utilizes the solar energy system, realizes the preheating treatment of the fresh air through the solar energy system, effectively reduces the drying energy consumption, wherein the solar energy can be significantly absorbed and stored through the adsorption structure, thereby improving the utilization rate of the solar energy.

Description of drawings

Fig. 1 is the schematic diagram of air closed cycle in the tunnel type multi-stage series heat pump drying system of the embodiment of the present invention;

Fig. 2 is a schematic diagram of solar preheating fresh air in a tunnel type multi-stage series heat pump drying system according to an embodiment of the present invention;

Fig. 3 is the A-A sectional view of Fig. 2 in the tunnel type multi-stage series heat pump drying system according to the embodiment of the present invention;

Fig. 4 is a schematic structural view of a water storage tray in a tunnel-type multi-stage series heat pump drying system according to an embodiment of the present invention.

In the figure: 1: main fan; 2: material trolley; 3: discharge port; 4: feed port; 5: fresh air valve; 6: exhaust valve; 7: exhaust duct; 8: adsorption structure; 9: Light-transmitting heat insulation board; 10: enclosure structure; 11: water storage tray; 12: outlet pipe; 13: support plate; 100: tunnel drying room; 200: fresh air heating room; 300: multi-stage heating room; 400: Multi-stage dehumidification chamber; 500: mixing chamber.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1-4, an embodiment of the present invention provides a tunnel type multi-stage series heat pump drying system, including a solar system, a heat pump circulation system and a drying system arranged in sequence from top to bottom.

The drying system includes a tunnel-type drying chamber 100, and the front and rear sides of the tunnel-type drying chamber 100 are respectively provided with a feed port 4 and a discharge port 3.

The solar energy system is a solar fresh air system, and the solar fresh air system includes a light-transmitting heat insulation board 9, an adsorption structure 8 and a support plate 13, wherein the support plate 13 is arranged on the adsorption structure 8, and the light-transmitting heat insulation board 9 is arranged on the support plate 13, The light-transmitting heat insulation board 9 , the adsorption structure 8 and the supporting board 13 enclose the fresh air heating chamber 200 .

The heat pump cycle system includes n heat pump systems, where n≥2. In this embodiment, the condensers of each heat pump system are C1, C2...Cn, and the condensers are connected in series to form a multi-stage heating chamber 300 . In this embodiment, the evaporators of each heat pump system are respectively E1 , E2 . A mixing chamber 500 is provided between the multi-stage heating chamber 300 and the multi-stage dehumidification chamber 400, and the left and right sides of the mixing chamber 500 are respectively provided with exhaust ducts 7 .

Wherein, the multi-stage heating chamber 300, the mixing chamber 500 and the multi-stage dehumidification chamber 400 are connected in sequence from front to back. The multi-stage heating chamber 300 communicates with the tunnel-type drying chamber 100 through the air supply port, and the multi-stage dehumidification chamber 400 communicates with the tunnel-type drying chamber 100 through the air return port. The fresh air heating chamber 200 communicates with the mixing chamber 500 through the hot air inlet, and the mixing chamber 500 communicates with the exhaust duct 7 through the air outlet.

Wherein, the discharge port 3 of the tunnel-type drying chamber 100 is arranged on the side corresponding to the air supply port of the multi-stage heating chamber 300, and the feed port 4 of the tunnel-type drying chamber 100 is arranged on the air return port of the multi-stage dehumidification chamber 400. the corresponding side.

A material trolley 2 is provided in the tunnel drying chamber. The material trolley 2 enters the tunnel drying chamber 100 from the feed port 4, and then exits from the discharge port 3. During this process, the material cart 2 passes through the tunnel drying chamber. 100 carries out drying process to the material in the material trolley 2.

Wherein, the supporting plate 13 of the solar system is provided with a fresh air inlet, and the external fresh air enters the fresh air heating chamber 200 through the fresh air inlet. The light-transmitting heat-shielding plate 9 can effectively transmit more sunlight, and has a heat-insulating effect at the same time, and is used for preheating fresh air. The interior of the adsorption structure 8 is provided with a heat storage material, and the outer surface of the adsorption structure 8 is provided with a solar adsorption material, which can effectively absorb solar energy and store energy.

Furthermore, each independent heat pump system is composed of a compressor, a condenser, a throttle valve, an evaporator, connecting pipes and corresponding accessories. Among them, the compressors are N1, N2...Nn, and the throttle valves are V1, V2...Vn, and each evaporator is connected to the condenser through the compressor, and the condenser is connected to the evaporator through the throttle valve. Wherein, the compressor is preferably a variable frequency compressor.

Specifically, a water storage tray 11 is provided in the multi-stage dehumidification chamber 400 , and the water storage tray 11 is arranged at the bottom of the evaporator, and an outlet pipe 12 is provided on the water storage tray 11 .

Wherein, a main fan 1 is provided at the air supply port of the multi-stage heating chamber 300, and the main fan 1 is preferably a variable frequency fan.

Wherein, a fresh air valve 5 is provided on the hot air inlet, and an exhaust valve 6 is provided on the air outlet, wherein both the fresh air valve 5 and the exhaust valve 6 are air valves with adjustable openings. The present invention regulates the heat-humidity balance of the system through the air exhaust valve 6 and the fresh air valve 5, combined with the solar energy system, not only ensures the stability of the drying process of the system, but also effectively improves the energy efficiency of the system.

Wherein, the enclosure structure 10 of the tunnel-type multi-stage series heat pump drying system of the present invention adopts thermal insulation materials, and the thermal insulation materials preferably adopt polyurethane thermal insulation boards. The invention adopts thermal insulation material as the enclosure structure on the periphery of the system, which can realize semi-open and closed-circuit separate or mixed operation, can effectively adapt to the harsh external environment, and improve the energy efficiency of the system.

In addition, the tunnel-type multi-stage series heat pump drying system of the present invention also includes a control system, which includes a control switch, a temperature controller, a humidity controller, and a PLC panel.

The working principle of the tunnel type multi-stage series heat pump drying system described in the present invention is as follows:

The high-temperature and high-humidity exhaust gas discharged from the tunnel-type drying chamber 100 enters the multi-stage dehumidification chamber 400 through the air return port, and in the multi-stage dehumidification chamber 400, the temperature and dehumidification are carried out step by step from the nth-stage evaporator En to the first-stage evaporator E1 , the dehumidified air enters the mixing chamber 500 and is mixed with the fresh air preheated by the solar system, and then the mixed air enters the multi-stage heating chamber 300, where it is sequentially condensed from the first stage From the condenser C1 to the nth stage condenser Cn, the temperature is raised by heating. The dehumidified and heated air passes through the main fan 1 and then enters the tunnel drying chamber 100 through the air supply port to dry the materials and transfer heat and moisture with the wet materials. During this process, the material trolley 2 in the tunnel-type drying chamber 100 gradually moves along the direction opposite to the flow direction of the drying hot air, and the material is dried during the moving process.

In the above process, adjust the fresh air valve 5 and the exhaust valve 6 according to the humidity and heat stability of the drying process system, wherein the fresh air volume and exhaust air volume are controlled by the opening of the fresh air valve 5 and the exhaust valve 6 . When heat and humidity are unbalanced, open the fresh air valve 5 and the exhaust valve 6, remove part of the air discharged through the multi-stage dehumidification chamber through the exhaust duct 7, and then introduce the fresh air preheated by the solar system through the fresh air valve 5, As shown in Figure 2, the direction of the arrow in the figure indicates the direction of air flow. In the case of heat and humidity balance, the fresh air valve 5 and the exhaust valve 6 are closed, and the air in the system is in a closed cycle at this time, as shown in Figure 1, the direction of the arrow in the figure indicates the direction of air flow.

In the above process, the frequency of the main fan 1 is adjusted according to the required circulating air volume, so that the circulating air volume meets the requirements of the drying conditions of the system, and the drying rate is adjusted by controlling the circulating air volume.

In the above-mentioned process, the speed and way of entering and exiting the material trolley 2 can be regulated according to the actual situation of the material.

In summary, the tunnel-type multi-stage series heat pump drying system described in the embodiment of the present invention can effectively recover waste heat and reduce the total energy consumption of the system through the utilization of solar energy. Compared with the single-stage heat pump drying system, this The invention adopts multi-stage dehumidification to effectively remove moisture in the dry air, adopts multi-stage heating to meet the situation of large temperature difference between the air sent and returned, improves the efficiency of the compressor, and effectively improves the dehumidification efficiency.

It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner ", "outside", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. a kind of tunnel type plural serial stage Analysis of Heat Pump Drying System, it is characterised in that：At least include setting gradually from top to bottom too Positive energy system, heat pump circulating system and drying system；

The drying system includes tunnel chamber for drying；

The solar energy system is solar energy VMC, and the solar energy VMC includes fresh air heating chamber；

The heat pump circulating system includes multiple heat pumps, and the condenser of each heat pump is followed in series to form multistage add Hot cell, the evaporator of each heat pump is followed in series to form multistage moist chamber, in the Multi-stage heating room and the multistage Mixing chamber is provided between moist chamber, the mixing chamber is respectively arranged on the left side and the right side exhausting duct；

Described Multi-stage heating room, mixing chamber and multistage moist chamber is sequentially communicated from front to back；The Multi-stage heating room is by sending Air port is connected with the tunnel chamber for drying, and the multistage moist chamber is connected by return air inlet with the tunnel chamber for drying It is logical；The fresh air heating chamber is connected by hot wind inlet with the mixing chamber, and the mixing chamber passes through exhaust outlet and the row Air channel is connected.

2. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 1, it is characterised in that：The solar energy fresh air System includes printing opacity thermal insulation board, adsorption structure and supporting plate, wherein the supporting plate is arranged on the adsorption structure, it is described Light thermal insulation board is arranged in the supporting plate, and described printing opacity thermal insulation board, adsorption structure and supporting plate surrounds the composition fresh air Heating chamber.

3. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 2, it is characterised in that：The adsorption structure Inside sets heat-storing material, and the outer surface of the adsorption structure sets solar energy sorbing material.

4. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 2, it is characterised in that：Set in the supporting plate There is fresh inlet.

5. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 1, it is characterised in that：The tunnel type is dried Room is provided with charging aperture and discharging opening, wherein the discharging opening is arranged on one of the correspondence air outlet in the tunnel chamber for drying Side, the charging aperture is arranged on the side of the correspondence return air inlet in the tunnel chamber for drying.

6. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 1, it is characterised in that：In the multistage dehumidifying Water storage disk is provided with room, the water storage disk is arranged on the bottom of the evaporator, and the water storage disk is provided with introduction pipe.

7. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 1, it is characterised in that：In the Multi-stage heating Main air blower is provided with the air outlet of room, the main air blower uses frequency conversion fan.

8. tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim 1, it is characterised in that：In the hot wind inlet Provided with new air-valve, the exhaust outlet is provided with exhaust valve.

9. the tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim any one of 1-8, it is characterised in that：The tunnel Material stroller, the moving direction of the material stroller and dry-heat air in the tunnel chamber for drying are provided with road formula hothouse Flow direction is opposite.

10. the tunnel type plural serial stage Analysis of Heat Pump Drying System according to claim any one of 1-8, it is characterised in that：It is described The outside building enclosure of tunnel type plural serial stage Analysis of Heat Pump Drying System uses polyurethane thermal insulation board.