CN208000039U - A kind of solar heat-preservation is in direct contact evaporation high temperature drying system - Google Patents

Abstract

The utility model discloses a direct contact evaporative high-temperature drying system for solar heat storage, which comprises a drying chamber with an air inlet and an air outlet, an air duct sealed and connected at both ends to the air inlet and air outlet of the drying chamber, and an air duct arranged in the air duct near the Condenser, fan, compressor, solar heat collector and direct contact evaporator on the air inlet side; the inlet of the condenser is connected to the low-temperature gas outlet directly contacting the evaporator through the compressor, and the outlet is directly contacting the evaporator through the thermal expansion valve The low-temperature liquid inlet is connected; the heat storage fluid inlet directly in contact with the evaporator is connected to the outlet of the solar heat collector through the heat storage fluid pump, and the heat storage fluid outlet is connected to the inlet of the solar heat collector through a stop valve. The utility model uses the heat storage fluid absorbed by the solar heat collector to enter the direct contact evaporator and the working fluid to fully contact and mix heat exchange, reduce the heat transfer temperature difference, increase the heat transfer efficiency, improve the performance of the heat pump cycle, and increase the condensation temperature and drying temperature.

Description

A direct contact evaporation high temperature drying system with solar heat storage

technical field

The utility model relates to the technical field of heat pumps for drying agricultural products, in particular to a direct-contact evaporation high-temperature drying system for solar heat storage.

Background technique

In the existing technical field of heat pump for drying agricultural products, the working fluid of the heat pump cycle usually exchanges heat with the medium of the low-temperature heat source through a partition wall. The heat transfer temperature difference of the evaporator is large, the evaporation temperature is low, and the heat transfer efficiency is low. temperature needs. my country is a big producer of agricultural products, and it is urgent to develop a clean, efficient and safe high-temperature heat pump drying system.

Utility model content

The purpose of this utility model is to provide a direct-contact evaporation high-temperature drying system with solar heat storage to further improve the thermal performance of the drying heat pump system and the temperature of the drying hot air to improve the drying efficiency.

The technical scheme adopted for realizing the purpose of this utility model is as follows:

A direct contact evaporative high temperature drying system for solar heat storage, comprising a drying chamber with an air inlet and an air outlet, an air duct with both ends sealed and connected to the air inlet and air outlet of the drying chamber, and a nearly The condenser on the side of the air inlet, the fan, the compressor, the solar heat collector, and the direct contact evaporator that makes the working fluid of the compressor directly contact with the thermal storage fluid of the solar heat collector for mixed heat exchange; The inlet is connected to the low-temperature gas outlet that directly contacts the evaporator through the compressor, and the outlet is connected to the low-temperature liquid inlet that directly contacts the evaporator through a thermal expansion valve; the heat storage fluid inlet that directly contacts the evaporator is connected to the solar collector through a heat storage fluid pump The outlet of the heat heater is connected, and the outlet of the thermal storage fluid is connected with the inlet of the solar heat collector through a shut-off valve.

The drying chamber is an insulating body formed by overall foaming, and the air duct is a pipe of the insulating body.

The air inlet and the air outlet are oppositely opened on two side walls of the drying chamber.

The drying chamber is provided with a door frame which is in sealing fit with the drying chamber door.

The outlet connecting pipeline of the compressor is connected to the inlet of the condenser through the air duct, and the outlet connecting pipeline of the condenser passes through the air duct and is connected to the low-temperature liquid inlet directly contacting the evaporator through a thermal expansion valve.

The utility model uses the heat-absorbing heat storage fluid of the solar heat collector to enter the direct contact evaporator, fully contacts and mixes heat exchange with the working fluid of the heat pump cycle through throttling and pressure reduction, reduces the heat transfer temperature difference, increases the heat transfer efficiency, and improves The evaporation temperature of the heat pump cycle reduces the pressure ratio of the compressor, improves the performance of the heat pump cycle, increases the condensation temperature and drying temperature, and improves the drying efficiency.

Description of drawings

Fig. 1 is the schematic diagram of the direct contact evaporation high-temperature drying system of solar heat storage of the present invention;

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, a direct contact evaporation high-temperature drying system for solar heat storage includes:

Condenser 1, fan 2, compressor 3, thermal expansion valve 4, direct contact evaporator 5, heat storage fluid pump 6, stop valve 7, solar collector 8, drying chamber door 9, drying chamber 10, air duct 11 ; The corresponding position of the drying chamber 10 is provided with an air inlet and an air outlet, and is connected with the two ends of the air duct 11 in a sealed fit; the condenser 1 and the fan 2 are placed on the air inlet side of the drying chamber 10 of the air duct 11; The outlet connection pipeline of the compressor 3 is connected to the inlet of the condenser 1 through the air duct 11, and after the outlet connection pipeline of the condenser 1 passes through the air duct 11, it passes through the thermal expansion valve 4 and directly contacts the evaporator 5. The low-temperature liquid inlet at the bottom is connected with a connecting pipe, and the low-temperature gas outlet near the top of the direct contact evaporator 5 is connected with the inlet of the compressor 3; the outlet of the solar heat collector 8 is connected with the inlet of the heat storage fluid pump, and heat storage The outlet of the fluid pump is connected to the thermal storage fluid inlet near the bottom of the direct contact evaporator 5 , and the thermal storage fluid outlet near the bottom of the direct contact evaporator 5 is connected to the inlet of the solar collector 8 through the stop valve 7 .

Wherein, the working fluid passing through the compressor 3 and the thermal storage fluid passing through the solar heat collector 8 are the same kind of fluid, and the two fluids are fully contacted and mixed for heat exchange in the direct contact evaporator 5 .

Wherein, the drying chamber 10 is an integrally foamed thermal insulation body, and the air duct 11 is a pipeline of the thermal insulation body.

Wherein, a door frame is provided on the side wall of the drying chamber 10 to sealably cooperate with the drying chamber door 9 .

When the system is running, start the compressor 3 and heat storage fluid pump 6, open the cut-off valve 7, the heat storage fluid absorbed in the solar collector 8 enters the evaporator 5, and the high-temperature and high-pressure liquid at the outlet of the condenser passes through the thermal The low-temperature working liquid behind the expansion valve 4 enters the direct contact evaporator 5, fully contacts with the heat storage fluid, mixes and exchanges heat, absorbs heat, and the evaporated working gas is sucked into the compressor 3. The air blown by the blower fan 2 in the air duct 11 enters the drying chamber 10 after being heated up by the condenser 1, and the air temperature in the drying chamber 10 is lowered to enter the return air of the air duct 11 through the air return port of the drying chamber 10. The air blown by the fan 2 again enters the drying chamber 10 after being heated up by the condenser 1 to realize the function of circulating air supply and drying.

The utility model uses the heat-absorbing heat storage fluid of the solar heat collector to enter the direct contact evaporator, fully contacts and mixes heat exchange with the working fluid of the heat pump cycle through throttling and pressure reduction, reduces the heat transfer temperature difference, increases the heat transfer efficiency, and improves The evaporation temperature of the heat pump cycle reduces the pressure ratio of the compressor, improves the performance of the heat pump cycle, increases the condensation temperature and drying temperature, and improves the drying efficiency.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (5)

1. A direct contact evaporation high-temperature drying system of solar heat storage, characterized in that it comprises a drying chamber with an air inlet and an air outlet, an air duct that is sealed and connected with the air inlet and the air outlet at both ends of the drying chamber, and The condenser, fan, compressor, and solar heat collector near the air inlet in the air duct, and a direct contact evaporator that makes the working fluid of the compressor directly contact the heat storage fluid of the solar heat collector for mixed heat exchange The inlet of the condenser is connected to the low-temperature gas outlet directly contacting the evaporator through the compressor, and the outlet is connected to the low-temperature liquid inlet directly contacting the evaporator through a thermal expansion valve; The thermal fluid pump is connected with the outlet of the solar heat collector, and the heat storage fluid outlet is connected with the inlet of the solar heat collector through a shut-off valve. 2. The direct contact evaporative high-temperature drying system for solar heat storage according to claim 1, characterized in that, the drying chamber is an insulation body formed by integral foaming, and the air duct is an insulation body pipeline. 3. The direct contact evaporative high-temperature drying system of solar heat storage according to claim 1, wherein the air inlet and the air outlet are oppositely opened on two side walls of the drying chamber. 4. The direct contact evaporative high-temperature drying system for solar heat storage according to claim 1, characterized in that, the drying chamber is provided with a door frame that is tightly fitted with the drying chamber door. 5. The direct contact evaporative high-temperature drying system for solar heat storage according to claim 1, characterized in that the outlet connecting pipeline of the compressor passes through the air duct to connect with the inlet of the condenser, and the outlet connecting pipeline of the condenser passes through After passing through the air duct, it is connected to the low-temperature liquid inlet directly contacting the evaporator through a thermal expansion valve.