The invention relates to the technical field of dehumidification and drying, in particular to a heat pump dehumidification and drying device.
Background technique:
Drying generally refers to various operations that remove moisture or other moisture from wet materials. The purpose of drying is to make the materials easy to store, transport and use, or to meet the needs of further processing. Drying operations are widely used in chemicals, food, light industry, and textiles. , Coal, agricultural and forestry product processing and building materials, such as in daily life, damp materials are exposed to the sun to remove water. In industry, silica gel, lime, concentrated sulfuric acid, etc. are used to remove water vapor, industrial gases or organic liquids. Moisture, or use hot air, flue gas, and infrared to heat wet solid materials in chemical production to vaporize and remove the moisture or solvent contained in them.
For drying technology, it is recognized that there are three major goals: to ensure product quality, not to cause pollution to the environment, and to save energy. Although the above-mentioned traditional drying technology can achieve the purpose of dehumidification and drying, there are still many shortcomings in the three aspects of "guarantee product quality, no pollution to the environment, and energy saving". For example, some chemical desiccants or drying environment may cause problems during the dehumidification process. The quality of the material is reduced; or some chemical pollutants are discharged during drying, which is easy to cause environmental pollution; or the heat generated during the drying process is lost or wasted seriously, causing energy waste.
In view of this, it is necessary to develop a heat pump dehumidifying and drying device that has good dehumidification effect, no pollution, and can fully recycle the heat generated in the heating process.
Technical realization elements:
The technical problem to be solved by the present invention is to provide a heat pump dehumidification drying device that has good dehumidification effect, no pollution, and can fully recycle the heat generated in the heating process.
In order to solve the above technical problems, the present invention discloses the following technical solutions: a heat pump dehumidification and drying device, including a gas circulation pipeline and a heat circulation pipeline, the gas circulation pipeline passes through a belt dryer and a filter device , A condenser, an evaporator, a first heater, a second heater and a return fan are connected in sequence, wherein the condenser and the first heater also pass through a closed pipeline with built-in condensation Connected, the evaporator is provided with an annular pipe and a drain pipe for discharging condensate, and the second heater is provided with an annular pipe; the heat circulation pipe passes through the annular pipe of the evaporator, a compressor, and The annular pipe of the second heater, a condensate receiver and an expansion valve are connected in sequence, and the heat circulation pipe is built with condensate.
The further technical solution is that the filtering device includes a first filter and a second filter, and the gas passes through the first filter and the second filter in sequence to remove dust particles therein.
The further technical solution is that a radiator is also connected to the pipeline between the second heater and the condensate receiver, and the radiator is used for dissipating heat and cooling the condensate in the heat circulation pipeline.
The further technical solution is that: the gas pipeline between the belt dryer and the filter device is also provided with a branch pipeline, the branch pipeline is connected with the second heater, and the branch pipeline is provided with a A first valve for controlling the flow of gas flowing into the branch pipeline; the inlet pipeline of the filter device is provided with a second valve for controlling the flow of gas flowing into the filter device.
The further technical solution is: a first temperature monitoring device and a humidity monitoring device are installed on the water vapor outlet pipe of the belt dryer, which are used to detect the temperature and humidity of the water vapor in the water vapor outlet pipe of the belt dryer .
A further technical solution is that: a second temperature monitoring device and a first pressure control device are provided on the inlet pipe of the return fan to detect the temperature and pressure of the gas in the inlet pipe of the return fan.
The further technical solution is that: a second pressure monitoring device is provided on the outlet pipe of the return fan for detecting the pressure of the gas in the outlet pipe of the return fan.
The further technical solution is that a pressure drop monitoring device is provided on the filter device for detecting the pressure difference between the air inlet and the air outlet of the filter device.
A further technical solution is that: a third temperature monitoring device and a third pressure monitoring device are provided on the inlet pipeline of the compressor for detecting the temperature and pressure of the condensate in the inlet pipeline of the compressor.
A further technical solution is that: a fourth temperature monitoring device and a fourth pressure monitoring device are provided on the refrigerant receiver for detecting the temperature and pressure of the refrigerant in the refrigerant receiver.
The beneficial technical effect of the present invention is that the heat pump dehumidification and drying device performs dehumidification and drying through a gas circulation pipeline connected with a belt dryer, a filter device, a condenser, an evaporator, a first heater, a second heater, and a return fan. The water vapor discharged from the material continuously circulates in the gas circulation pipeline, the dehumidification and drying effect is good, and there is no need to add some other chemical desiccants during the dehumidification process, the water vapor is condensed into water in the evaporator and discharged, and the discharge is only condensed water. There are pollutants and no pollution to the environment. At the same time, the heat pump dehumidification and drying device also reuses heat through the heat circulation pipeline formed by the evaporator, compressor, second heater, condensate receiver and expansion valve, which saves energy energy.
Description of the drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
detailed description
In order to fully understand the technical content of the present invention, the technical solution of the present invention will be further introduced and illustrated below in conjunction with the schematic diagram, but it is not limited thereto.
As shown in Figure 1, in the present invention, the heat pump dehumidification and drying device includes a gas circulation pipeline and a heat circulation pipeline. The gas circulation pipeline passes through a belt dryer 10, a first filter 11, and a first filter. Two filters 12, a condenser 13, an evaporator 14, a first heater 15, a second heater 16 and a return fan 17 are connected in sequence. Among them, the condenser 13 and the first heater 15 The evaporator 14 is provided with an annular pipe and a drain pipe 141 for draining condensate water, and the second heater 16 is provided with an annular pipe; the heat circulation pipe passes through The annular pipe of the evaporator 14, a compressor 20, an annular pipe of the second heater 16, a condensate receiver 21 and an expansion valve 22 are connected in sequence, and the heat circulation pipe contains a condensate.
Among them, the material to be dried is installed on the belt dryer 10. In this embodiment, the belt dryer 10 adopts a multi-layer belt dryer 10 to place the materials. Of course, in some other preferred embodiments, A single-stage belt dryer, a multi-stage belt dryer 10 or an impact belt dryer 10 can be used. In addition, the filtering device composed of the first filter 11 and the second filter 12 is mainly used to remove dust particles in the water vapor discharged from the belt dryer 10 to avoid clogging the machine and affecting the normal operation of the machine. In this embodiment, the first filter 11 adopts a coarse-efficiency filter, which has a filtering efficiency of 90>E≥70% for dust with a particle size ≥5.0μm; the second filter 12 adopts a high- and medium-efficiency filter, Its filtration efficiency for dust with a particle size of ≥1.0μm is 90>E≥75%. After two layers of filtration, the dust in the water vapor can be basically removed. In some other preferred embodiments, more levels of filters can be designed for filtering according to actual conditions, or filters of different filtering levels can be selected.
In this embodiment, both the evaporator 14 and the second heater 16 adopt surface heat exchangers, in which the gas in the gas circulation pipeline passes through the outer wall of the annular pipe of the evaporator 14 and the second heater 16 and interacts with the evaporator. The condensate flowing in the annular pipes of the heater 14 and the second heater 16 exchange heat.
As shown in Figure 1, during specific work, the compressor 20 works to heat up the refrigerant in the heat circulation pipeline to vaporize, and the high-temperature refrigerant enters the second heater 16 and transfers heat to the air in the second heater 16 to form High-temperature air, under the action of the return fan 17, the high-temperature air flows into the belt dryer 10 so that the material is heated and discharged from the moisture to form high-temperature water vapor. The high-temperature water vapor passes through the first filter 11 and the second filter 12 to remove dust and enter In the condenser 13, the high-temperature water vapor transfers heat to the condensate in the closed pipe 125 connected between the condenser 13 and the first heater 15 for cooling, and then the water vapor continues to enter the evaporator 14 to further cool down. Cooling will condense more water. The condensed water is discharged through the drain pipe 141 in the evaporator 14, and the condensate in the closed pipe 125 absorbs heat and vaporizes and enters the first heater 15 to be heated through the evaporator 14. After cooling, the gas flows into the first heater 15, and then the gas enters the second heater 16 for further heating and drying so that it flows into the belt dryer 10 through the return fan 17 to continue to take out the moisture in the material. The material in the belt dryer 10 is dehumidified and dried. Among them, in order to ensure the smooth circulation of the refrigerant in the closed pipeline 125, the fixed position of the condenser 13 is usually set at a position slightly lower than the first heater 15. In this way, the refrigerant absorbs heat in the condenser 13 and vaporizes It rises to the first heater 15 to radiate heat, and radiates heat in the first heater 15 to condense and then flows back to the condenser 13 to circulate and absorb heat.
In order to avoid the waste of heat, the present invention recovers and utilizes heat through the heat circulation pipeline, as shown in Fig. 1. During specific operation, the high-temperature water vapor in the evaporator 14 transfers heat to the condensate in the heat circulation pipeline, and the condensate absorbs After the heat rises and vaporizes, it enters the compressor 20. The compressor 20 works to further increase the temperature of the condensate and enters the second heater 16. The high-temperature condensate transfers the heat in the second heater 16 to the second heater 16 The gas, the refrigerant releases heat and then cools, enters the refrigerant receiver 21, then flows through the expansion valve 22 for expansion, pressure reduction and temperature reduction to enter the evaporator 14, and then absorbs the heat in the high-temperature water vapor in the evaporator 14, so Circulation to realize heat recovery and utilization.
In some other preferred embodiments, a radiator is also connected to the pipeline between the second heater 16 and the condensate receiver 21, and the radiator is used to dissipate heat and reduce the temperature of the condensate in the heat circulation pipeline, so that the condensate enters The condensate of the agent receiver 21 is in a low temperature state, which is beneficial to the continuous heat recovery.
Considering the limited processing capacity of the heat pump dehumidification and drying device, in order to ensure a more stable operation of the device, a branch pipe is also provided on the gas pipeline between the belt dryer 10 and the filter device, and the branch pipe is in communication with the second heater 16. And the branch pipeline is provided with a first valve 18 for controlling the flow of gas into the branch pipeline; the inlet pipeline of the filtering device is provided with a second valve 19 for controlling the flow of gas into the filtering device. In this way, the water vapor from the belt dryer 10 can be divided, wherein the water vapor passing through the first valve 18 directly enters the second heater 16 for heating cycle, and then circulates into the belt dryer 10 through the return fan 17 Bring out the moisture in the material; and the water vapor passing through the second valve 19 sequentially passes through the first filter 11, the second filter 12, the condenser 13, the evaporator 14, the first heater 15 and the second heater 16, and the water vapor The dust particles, moisture, etc. are basically removed, so that the gas entering the return fan 17 is dry and dust-free. When the water vapor coming out of the belt dryer 10 is large, the water vapor is divided and circulated to ensure that the device works more smoothly, avoiding the first filter 11, the second filter 12, the condenser 13, the evaporator 14, and the first heating The heater 15 and the second heater 16 cannot process a large amount of water vapor at the same time. In actual work, the opening and closing of the first valve 18 and the second valve 19 can be controlled according to actual needs, so that the drying efficiency is higher.
In this embodiment, the medium and low temperature environmental protection refrigerant R134a is used as the condensing agent. Of course, in some other embodiments, a suitable condensing agent can be selected according to the needs of the actual process and the characteristics of the condensing agent.
In some preferred embodiments, a first temperature monitoring device 101 and a humidity monitoring device 102 are installed on the water vapor outlet pipe of the belt dryer 10, and the belt type can be detected by the first temperature monitoring device 101 and the humidity monitoring device 102. The temperature and humidity of the water vapor coming out of the dryer 10 can be adjusted by the user according to the temperature and humidity to adjust the working parameters of related components in the heat pump dehumidification and drying device, such as adjusting the compressor 20, the return fan 17 or the expansion valve 22 And other working power in order to achieve the purpose of dehumidification and drying.
In some preferred embodiments, a second temperature monitoring device 171 and a first pressure control device 172 are provided on the inlet pipe of the return fan 17, and the user can understand the entry through the second temperature monitoring device 171 and the first pressure control device 172. The temperature and pressure of the gas in the return fan 17 are used for the user to adjust the working parameters of the relevant devices in the heat pump dehumidification and drying device.
In some preferred embodiments, a second pressure monitoring device 173 is provided on the outlet pipe of the return fan 17, and the user can learn the pressure of the gas at the outlet of the return fan 17 through the second pressure monitoring device 173, so that the user can adjust the heat pump dehumidification. The working parameters of the relevant devices in the drying device.
In some preferred embodiments, a pressure drop monitoring device 112 is provided on the filter device, and the pressure drop monitoring device 112 is used to detect the pressure difference between the air inlet and the air outlet of the filter device, and the user judges according to the pressure change Whether the filter device is clogged, when the pressure difference between the air inlet and the air outlet is too large, it means that the filter device is clogged, and the user needs to clean the filter device in time for the heat pump dehumidification and drying device to work normally.
In some preferred embodiments, a third temperature monitoring device 201 and a third pressure monitoring device 202 are provided on the inlet pipeline of the compressor 20, and the user can understand the entry through the third temperature monitoring device 201 and the third pressure monitoring device 202. The temperature and pressure of the condensate in the compressor 20 are used for the user to adjust the working parameters of the relevant devices in the heat pump dehumidification and drying device.
In some preferred embodiments, a fourth temperature monitoring device 211 and a fourth pressure monitoring device 212 are provided on the condensate receiver 21. The user can learn about the condensate through the fourth temperature monitoring device 211 and the fourth pressure monitoring device 212. The temperature and pressure of the condensate in the receiver 21 are used for the user to adjust the working parameters of the relevant devices in the heat pump dehumidification and drying device.
In the solution of the present invention, the heat pump dehumidification and drying device passes through a belt dryer 10, a first filter 11, a second filter 12, a condenser 13, an evaporator 14, a first heater 15, a second heater 16 and The air circulation pipe formed by the return fan 17 is connected to perform dehumidification and drying. The water vapor discharged from the material continuously circulates in the gas circulation pipe for drying. The drying effect is good; and there is no need to add some chemical substances for drying during the dehumidification process. It is condensed into water in the evaporator 14 and flows out, which does not pollute the environment; in addition, the heat pump dehumidification and drying device is formed by communicating with the evaporator 14, the compressor 20, the second heater 16, the condensate receiver 21 and the expansion valve 22 The heat circulation pipeline recycles heat and saves energy. The radiator connected between the second heater 16 and the condensate receiver 21 can sufficiently release heat from the condensate in the heat circulation pipeline, which is beneficial to the continuous heat recovery.
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