High-temperature drying system for water-working substance

Abstract

The utility model discloses a kind of high-temperature drying systems for water working substance, including evaporative condenser, partition wall type drying device, further including the liquid storage device for storing working substance;The liquid storage device is connected by first pipeline and evaporative condenser, the liquid storage device is formed first circulation loop by first pipeline and partition wall type drying device, second circulation loop is formed by second pipeline and throttling expansion valve, evaporative condenser, heat pump compressor, partition wall type drying device, and the exhaust outlet of partition wall type drying device is accessed evaporative condenser.Liquid storage device transports working substance preheating material inside partition wall type drying device, evaporative condenser recycles energy carried by exhaust gas discharged by partition wall type drying device, and the heat recovered is returned to partition wall type drying device after compression by heat pump compressor.The drying system of the utility model can achieve higher drying temperature, lower cost, and is safer compared to chemical working substance.

Description

Technical Field

[0001] This utility model relates to a gas control device for drying, and more particularly to a high-temperature drying system for water-based media. Background Technology

[0002] In the field of wet material drying, heat pump technology is developing rapidly, saving at least 60% more energy than traditional electric and steam heat source drying. Heat pump technology based on the reverse Carnot cycle mainly focuses on steam temperatures below 150°C, while over 70% of industrial heating needs operate above 160°C. To meet the heating demands of most industries, it is necessary to develop heat pump technology for high-temperature ranges above 160°C. Currently, the working fluids for high-temperature heat pumps around 160°C are all chemical products, which are expensive and limit the application of high-temperature heat pump technology around 160°C.

[0003] Water, as a working medium (water working medium), has the advantages of safety and environmental protection. The invention patent application with publication number CN 116123859 A discloses a material drying heat recovery system. This scheme is an open system of water vapor pressurization, which is not suitable for closed systems. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a high-temperature drying system for water-based media in closed systems.

[0005] Technical solution: The present invention provides a high-temperature drying system for water-based working fluids, comprising an evaporator-condenser, a partitioned drying device, and a liquid storage device for storing the working fluid; the liquid storage device is connected to the evaporator-condenser via a first pipeline, and forms a first circulation loop with the partitioned drying device via the first pipeline, and forms a second circulation loop with the expansion valve, the evaporator-condenser, the heat pump compressor, and the partitioned drying device via a second pipeline, and the exhaust gas outlet of the partitioned drying device is connected to the evaporator-condenser.

[0006] Preferably, a preheating heat source and a preheating circulation pump are provided on the first pipeline downstream of the liquid storage device.

[0007] Preferably, a third pipeline is connected to the first pipeline downstream of the preheating heat source, and the third pipeline is connected in series with an evaporator-condenser and a liquid storage device.

[0008] Preferably, a first control valve and a second control valve are respectively installed on the third pipes at the inlet and outlet of the evaporator condenser.

[0009] Preferably, a third control valve and a gas-liquid separation device are provided on the second pipeline between the evaporator / condenser and the heat pump compressor.

[0010] Preferably, a first check valve is provided on the second pipeline between the heat pump compressor and the indirect drying unit.

[0011] Preferably, a second check valve is provided on the first pipeline downstream of the preheating heat source.

[0012] Preferably, a dust removal and filtration device is provided between the exhaust gas outlet of the partition-type drying device and the evaporator-condenser.

[0013] Preferably, a dust removal and filtration device is provided between the exhaust gas outlet of the partition-type drying device and the evaporator-condenser.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following significant advantages: 1. Applicable to closed systems: The liquid storage device transports the working fluid to preheat the materials inside the partitioned drying device, and the evaporator and condenser recover the energy carried by the exhaust gas discharged from the partitioned drying device. The recovered heat is compressed by the heat pump compressor and returned to the partitioned drying device, and then back to the liquid storage device, forming a closed loop; 2. It can achieve high-temperature heat source output of 160℃ or even more than 300℃; 3. The overall energy consumption is reduced by more than 60% compared with the traditional steam system; 4. The price of water working fluid is extremely low, and it does not require lubricating oil during circulation. Compared with the current chemical working fluid heat pump system, it has lower cost, higher temperature range, is safer, and more environmentally friendly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0018] Example 1: As Figure 1The diagram shown is a schematic of the high-temperature drying system for water-based media in this embodiment. The high-temperature drying system for water-based media mainly consists of a partition-type drying device 2, an evaporator-condenser 4, a heat pump compressor 8, a liquid storage device 10, and a throttling expansion valve 11. The liquid storage device 10 has at least two pipelines. The first pipeline and the partition-type drying device 2 form a first circulation loop, and the second pipeline and the throttling expansion valve 11, the evaporator-condenser 4, the heat pump compressor 8, and the partition-type drying device 2 form a second circulation loop. The exhaust gas outlet of the partition-type drying device 2 is connected to the evaporator-condenser 4. Before drying, the liquid storage device 10 conveys a working fluid with a certain temperature through the first circulation loop to heat the wet material inside the partition dryer 2, and then returns to the liquid storage device 10. After the wet material is heated, the exhaust gas is discharged and conveyed to the evaporator condenser 4. The working fluid inside the liquid storage device 10 expands through the throttling expansion valve 11 and enters the evaporator condenser 4 to recover the heat from the exhaust gas. The recovered heat is compressed by the heat pump compressor 8 and sent back to the partition dryer 2 to heat the material. The working fluid after heating the material in the second circulation loop returns to the liquid storage device 10, forming a closed loop.

[0019] On the first pipeline, a preheating circulation pump 14 and a preheating heat source 15 are provided downstream of the liquid storage device 10. The preheating heat source 15 heats the working fluid flowing through the first circulation loop to the target temperature. There is a check valve B16 between the preheating heat source 15 and the indirect drying device.

[0020] The first pipeline downstream of the preheating heat source 15 is equipped with a third pipeline, which is connected to the evaporator condenser 4 and then back to the liquid storage device 10. Thus, before drying, the working fluid with a certain temperature output from the liquid storage device 10 can simultaneously preheat the partition dryer 2 and the evaporator condenser 4. Control valves B17 and C18 are respectively installed on the third pipeline at the inlet and outlet of the evaporator condenser 4. Control valves B17 and C18 are used to control the opening and closing of the third pipeline.

[0021] On the second pipeline, a control valve A12 and a gas-liquid separation device 13 are provided between the evaporator condenser 4 and the heat pump compressor 8, and a check valve A9 is provided between the heat pump compressor 8 and the indirect drying device 2.

[0022] The exhaust outlet of the partition-type dryer 2 is equipped with a dust removal and filtration device 3. After the exhaust gas is treated by the dust removal and filtration device 3, it enters the evaporator condenser 4 to recover energy.

[0023] The operating principle of the preheating mode of the high-temperature drying system for water-based materials in this embodiment is as follows:

[0024] Step 1: Wet material 1 enters the partition-type drying device 2.

[0025] Step 2: Start the preheating circulation pump 14, control valve C18, and control valve B17, and close control valve A12. The preheating circulation pump 14 transports the water medium inside the storage device 10 to the preheating heat source 15, heating it to above 160℃. The heated water medium is then divided into two streams, preheating the material inside the indirect-flow dryer 2 and the water medium inside the evaporator-condenser 4, respectively. Specifically: the first stream is transported to the indirect-flow dryer 2 via the first pipeline and check valve B16, heating the wet material 1 inside the indirect-flow dryer 2 to approximately 150℃, causing the water or organic phase in the wet material to vaporize into high-temperature exhaust gas above 105℃; the second stream is transported via the third pipeline... Control valve B17 delivers water to evaporator condenser 4, heating the water medium inside evaporator condenser 4 to above 100°C. The water medium after preheating the partition dryer 2 returns directly to the storage tank 10. The water medium after preheating evaporator condenser 4 is delivered back to the storage tank 10 via the third pipeline and control valve C18. At the same time, the high-temperature steam above 105°C discharged from partition dryer 2 enters evaporator condenser 4 after being filtered by dust removal and filtration device 3, heating the water medium in evaporator condenser 4 and causing it to vaporize.

[0026] Step 4: Preheating is complete. Turn off the preheating circulation pump 14, preheating heat source 15, control valve B17, and control valve C18.

[0027] After preheating is complete, the operating principle of the drying mode is as follows:

[0028] Step 6: Start the heat pump compressor 8 and the throttling expansion valve 11, and simultaneously open the control valve A12.

[0029] The heat pump compressor 8 compresses the 100°C water-based working fluid vapor from the evaporator-condenser 4, transforming the low-temperature, low-pressure water-based working fluid vapor into a high-temperature, high-pressure gaseous water-based working fluid vapor at a temperature above 170°C. This high-temperature, high-pressure gaseous water-based working fluid vapor enters the indirect-flow drying device 2 through the check valve A9, where it is heated to vaporize the water and / or organic phase carried by the wet material into high-temperature waste gas at a temperature above 105°C. Simultaneously, the high-temperature, high-pressure gaseous water-based working fluid flowing through the indirect-flow drying device 2 becomes a high-pressure liquid water-based working fluid, returning to the liquid storage device 10. Then, it undergoes isenthalpic cooling through the throttling expansion device 11, becoming a low-temperature, low-pressure liquid water-based working fluid at a temperature of 100°C. This 100°C low-temperature, low-pressure liquid water-based working fluid enters the evaporator-condenser 4, recovering the heat from the high-temperature waste gas at a temperature above 105°C discharged from the indirect-flow drying device 2. Finally, it enters the heat pump compressor 8 through the control valve A 12, and the cycle continues.

[0030] Step 7: After the waste gas exchanges energy with the evaporator condenser 4, the water vapor (or organic phase) liquefies into condensate, and the remaining non-condensable gas is discharged to the waste gas treatment section for treatment.

[0031] Example 2: Based on Example 1, this example has the following variation: the preheating heat source 15 is located upstream of the preheating circulation pump 14 and is integrated into the liquid storage device 10.

Claims

1. A high-temperature drying system for water-based materials, comprising an evaporator-condenser (4) and a partitioned drying device (2), characterized in that, It also includes a liquid storage device (10) for storing the working fluid; the liquid storage device (10) forms a first circulation loop through a first pipeline and a partition dryer (2), and forms a second circulation loop through a second pipeline and a throttling expansion valve (11), an evaporator condenser (4), a heat pump compressor (8), and a partition dryer (2); the exhaust gas outlet of the partition dryer (2) is connected to the evaporator condenser (4).

2. The high-temperature drying system for water-based materials according to claim 1, characterized in that, A preheating heat source (15) and a preheating circulation pump (14) are provided on the first pipeline downstream of the liquid storage device (10).

3. The high-temperature drying system for water-based materials according to claim 2, characterized in that, A third pipeline is connected to the first pipeline downstream of the preheating heat source (15), and the third pipeline is connected in series with the evaporator condenser (4) and the liquid storage device (10).

4. The high-temperature drying system for water-based materials according to claim 3, characterized in that, The first control valve (17) and the second control valve (18) are respectively installed on the third pipes at the inlet and outlet of the evaporator condenser (4).

5. The high-temperature drying system for water-based media according to claim 1, characterized in that, A third control valve (12) and a gas-liquid separation device (13) are provided on the second pipeline between the evaporator condenser (4) and the heat pump compressor (8).

6. The high-temperature drying system for water-based materials according to claim 1, characterized in that, A first check valve (9) is provided on the second pipeline between the heat pump compressor (8) and the indirect drying unit (2).

7. The high-temperature drying system for water-based materials according to claim 4, characterized in that, A second check valve (16) is installed on the first pipeline downstream of the preheating heat source (15).

8. The high-temperature drying system for water-based materials according to claim 1, characterized in that, A dust removal and filtration device (3) is provided between the exhaust gas outlet of the indirect-flow drying device (2) and the evaporator condenser (4).

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