Combined forced air thermal regeneration dryer

Abstract

The utility model provides a combined type blast hot regeneration dryer, dryer import, precooling evaporimeter, gas -liquid separator, alternate adsorption module, dryer export connect gradually form the cooling adsorption flow path, the air blower, the heat accumulator, the heater, alternate adsorption module, second waste gas blowdown valve connect gradually form environmental gas heating regeneration flow path, precooling evaporimeter, refrigeration compressor, condenser, throttling device form refrigeration circulation flow path, dryer export, alternate adsorption module, first waste gas blowdown valve form first finished gas cold blow cooling flow path. The utility model provides a combined type blast hot regeneration dryer, adopts the way that low temperature pretreatment and regeneration process high temperature heat compensation are combined in adsorption process to ensure that adsorbent has stable, good adsorption and regeneration condition in each adsorption cycle, can make gas get deep drying, and effectively reduce the system energy consumption in the processing process.

Description

Technical Field

[0001] This utility model relates to the field of dryer technology, and in particular to a combined blower-type hot regeneration dryer. Background Technology

[0002] The blower-heated regenerative adsorption dryer is a type of temperature- and pressure-swing adsorption drying device. Its function is to remove moisture from compressed gas through the principle of adsorption-desorption with pressure- and temperature-swinging adsorption, thereby achieving the purpose of drying the compressed gas. The dew point temperature, or simply dew point, is the temperature at which air reaches saturation under constant water vapor content and pressure, and is expressed in degrees Celsius (°C). Dew point temperature is an indicator of gas dryness, not a general temperature measurement. Under the same conditions, a lower dew point temperature indicates higher dryness.

[0003] Utility model patent CN210814549U discloses a controlled, low-consumption blower-type regenerative dryer. This dryer includes an adsorption tower I, an adsorption tower II, and an air supply system. The adsorption towers I and II are identical, and both contain adsorbent. This utility model patent utilizes the difference in adsorption capacity of the adsorbent at different temperatures to achieve a cycle of adsorption and separation. The adsorption towers I and II are used alternately for adsorption and drying, allowing for an uninterrupted drying and adsorption process without shutting down the system.

[0004] However, this patent has the following problems: High temperature not only increases the moisture content in the air, leading to a greater load on the adsorption system of the blower regeneration dryer, but also has an adverse effect on the performance of the adsorbent, reducing its ability to adsorb moisture; therefore, due to the frequent fluctuations in the exhaust temperature of the air compressor, it is generally difficult to stabilize the compressed air drying process using the above-mentioned blower regeneration dryer at a low dew point temperature, resulting in high energy consumption during the process. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a combined blower-type hot regeneration dryer.

[0006] The purpose of this utility model is achieved through the following technical solution: a combined blower-type hot regeneration dryer, including a dryer inlet, a dryer outlet, a pre-cooling evaporator, an alternating adsorption module, a refrigeration compressor, a gas-liquid separator, a blower, a heat accumulator, a heater, a second waste gas vent valve, and a throttling device. The alternating adsorption module includes a first adsorption tower and a second adsorption tower that operate alternately, with the inlet ends of the first and second adsorption towers connected to the second waste gas vent valve. The dryer inlet, pre-cooling evaporator, gas-liquid separator, alternating adsorption module, and dryer outlet are sequentially connected to form a cooling adsorption flow path. The blower, heat accumulator, heater, alternating adsorption module, and second waste gas vent valve are sequentially connected to form an ambient gas heating and regeneration flow path. The pre-cooling evaporator, refrigeration compressor, condenser, and throttling device form a refrigeration circulation flow path. The dryer outlet, alternating adsorption module, and first waste gas vent valve form a first finished product gas cooling and blowing flow path.

[0007] As a preferred embodiment, the dryer outlet, alternating adsorption module, heat accumulator, and second waste gas venting valve form a second finished product gas cooling flow path.

[0008] Preferably, a heat exchange device is provided between the refrigeration compressor and the condenser. The heat exchanger is provided with a first heat exchange inlet, a first heat exchange outlet corresponding to the first heat exchange inlet, a second heat exchange inlet, and a heat exchange outlet corresponding to the second heat exchange inlet. The outlet of the refrigeration compressor is connected to the first heat exchange inlet, and the first heat exchange outlet is connected to the inlet of the condenser. The heat accumulator is provided with a first inlet, a second inlet, a first outlet, and a second outlet. A blower is connected to the first inlet of the heat accumulator. The second inlet of the heat accumulator is connected to a heat accumulator heating pipe. The inlets of the first adsorption tower and the second adsorption tower are simultaneously connected to a venting pipe. A second bypass switching valve is provided between the venting pipe, the heat accumulator heating pipe, and the second waste gas venting valve. The first outlet of the heat accumulator is connected to the second heat exchange inlet of the heat exchange device, and the second outlet of the heat accumulator is connected to the first waste gas venting valve. The second heat exchange outlet of the heat exchange device is connected to a heater.

[0009] Preferably, the precooling evaporator is provided with a processing gas inlet, a processing gas outlet, a refrigerant inlet, and a refrigerant outlet. The processing gas inlet of the precooling evaporator is connected to the dryer inlet, the processing gas outlet of the precooling evaporator is connected to the gas-liquid separator inlet, the refrigerant inlet of the precooling evaporator is connected to the condenser outlet, and the refrigerant outlet of the precooling evaporator is connected to the refrigeration compressor inlet. The outlet of the gas-liquid separator is connected to the inlet end of the first adsorption tower and the second adsorption tower, and the outlet end of the first adsorption tower and the second adsorption tower is connected to the dryer outlet.

[0010] Preferably, a first bypass switching valve is provided at the dryer inlet, and the three ports on the first bypass switching valve are respectively connected to the dryer inlet, the dryer outlet and the processing gas inlet of the precooling evaporator.

[0011] Preferably, the heater is an electric heater or a steam heater.

[0012] Preferably, the blower is a variable frequency speed control blower, and the total pressure of the variable frequency speed control blower is not less than 15 kPa.

[0013] Preferably, the refrigerant in the refrigeration cycle is a hydrochlorofluorocarbon, hydrofluorocarbon, or hydrofluoroolefin refrigerant.

[0014] Preferably, the system also includes a common skid base, and the precooling evaporator, gas-liquid separator, first adsorption tower, second adsorption tower, and blower are all fixedly installed on the common skid base.

[0015] Preferably, the shells of the first adsorption tower, the second adsorption tower, the heat accumulator, and the heater are all covered with a rock wool insulation layer with a thickness of 40mm-70mm.

[0016] The beneficial effects of this utility model are: This utility model provides a combined blower-type hot regeneration dryer, which adopts a combination of low-temperature pretreatment in the adsorption process and high-temperature heat exchange compensation in the regeneration process to ensure that the adsorbent has stable and good adsorption and regeneration conditions in each adsorption cycle, which can deeply dry the gas while effectively reducing the system energy consumption in the process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram: 1. Precooling evaporator; 2. Gas-liquid separator; 3. First adsorption tower; 4. Second adsorption tower; 5. Blower; 6. Heater; 7. Silencer; 8. Heat accumulator; 9. Refrigeration compressor; 10. Condenser; 11. Heat exchanger; 12. First waste gas vent valve; 13. Second waste gas vent valve; 14. First bypass switching valve; 15. Second bypass switching valve; 16. Venting pipeline; 17. Heat accumulator heating pipeline; 18. Throttling device. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0020] like Figure 1As shown, a combined blower-type hot regeneration dryer includes a dryer inlet, a dryer outlet, a pre-cooling evaporator 1, an alternating adsorption module, a refrigeration compressor 9, a gas-liquid separator 2, a blower 5, a heat accumulator 8, a heater 6, a second waste gas vent valve 13, and a throttling device 18. The alternating adsorption module includes a first adsorption tower 3 and a second adsorption tower 4 that operate alternately. The inlets of the first adsorption tower 3 and the second adsorption tower 4 are connected to the second waste gas vent valve 13. The dryer inlet, pre-cooling evaporator 1, gas-liquid separator 2, alternating adsorption module, and dryer outlet are sequentially connected to form a cooling adsorption flow path. The blower 5, heat accumulator 8, heater 6, alternating adsorption module, and second waste gas vent valve 13 are sequentially connected to form an ambient gas heating and regeneration flow path. The pre-cooling evaporator 1, refrigeration compressor 9, condenser 10, and throttling device 18 form a refrigeration circulation flow path. The dryer outlet, alternating adsorption module, and first waste gas vent valve 12 form a first finished gas cooling and blowing flow path. The dryer outlet, alternating adsorption module, heat accumulator 8, and second waste gas venting valve 13 form the second finished product gas cooling flow path.

[0021] The precooling evaporator 1 is provided with a processing gas inlet, a processing gas outlet, a refrigerant inlet, and a refrigerant outlet. The processing gas inlet of the precooling evaporator 1 is connected to the dryer inlet, the processing gas outlet of the precooling evaporator 1 is connected to the inlet of the gas-liquid separator 2, the refrigerant inlet of the precooling evaporator 1 is connected to the outlet of the condenser 10, and the refrigerant outlet of the precooling evaporator 1 is connected to the inlet of the refrigeration compressor 9. The outlet of the gas-liquid separator 2 is connected to the inlet end of the first adsorption tower 3 and the second adsorption tower 4, and the outlet end of the first adsorption tower 3 and the second adsorption tower 4 is connected to the dryer outlet.

[0022] Furthermore, a heat exchange device 11 is provided between the refrigeration compressor 9 and the condenser 10. The heat exchanger is provided with a first heat exchange inlet, a first heat exchange outlet corresponding to the first heat exchange inlet, a second heat exchange inlet, and a heat exchange outlet corresponding to the second heat exchange inlet. The outlet of the refrigeration compressor 9 is connected to the first heat exchange inlet, and the first heat exchange outlet is connected to the inlet of the condenser 10. The heat accumulator 8 is provided with a first input port, a second input port, a first output port, and a second output port. The blower 5 is connected to the first input port of the heat accumulator 8. The second input port of the heat accumulator 8 is connected to the heat accumulator heating pipe 17. The inlets of the first adsorption tower 3 and the second adsorption tower 4 are simultaneously connected to the venting pipe 16. A second bypass switching valve 15 is provided between the venting pipe 16, the heat accumulator heating pipe 17, and the second waste gas venting valve 13. The first output port of the heat accumulator is connected to the second heat exchange inlet of the heat exchange device 11, and the second output port of the heat accumulator is connected to the first waste gas venting valve 12. The second heat exchange outlet of the heat exchange device 11 is connected to the heater 6.

[0023] The working principle of this utility model is as follows: Hot and humid compressed air (processing air) from the front-end air compressor enters the pre-cooling evaporator 1 through the dryer inlet of the combined blower-type hot regeneration dryer. The processing air exchanges heat with the refrigerant in the refrigeration cycle in the pre-cooling evaporator 1. The refrigerant evaporates and absorbs heat in the pre-cooling evaporator 1, carrying away the heat from the processing air and cooling it down. The cooled and condensed liquid water is separated by the gas-liquid separator 2 and then continues to the alternating adsorption module. The first adsorption tower 3 and the second adsorption tower 4 in the alternating adsorption module operate alternately. The first adsorption tower 3 and the second adsorption tower 4 are filled with adsorbents that have a certain adsorption capacity for moisture. The condensed processing air is further dried by the adsorption of the first adsorption tower 3 and the second adsorption tower 4. The gas dried by the adsorption towers becomes the finished product gas, which is discharged from the dryer outlet.

[0024] In the refrigeration cycle, refrigerant circulates. Low-temperature, low-pressure liquid refrigerant is introduced into the pre-cooling evaporator 1 through the refrigerant inlet. The refrigerant evaporates and absorbs heat in the pre-cooling evaporator 1, and exchanges heat with the processed gas, cooling the processed gas and causing the moisture in the processed gas to condense. At the same time, the refrigerant absorbs heat and evaporates into a gaseous state. The gaseous refrigerant is discharged from the refrigerant outlet and enters the refrigeration compressor 9. The refrigeration compressor 9 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. After passing through the heat exchange device 11, the high-temperature, high-pressure gaseous refrigerant enters the condenser 10, where it is condensed into a room-temperature, high-pressure liquid. After passing through the throttling device 18, it becomes a low-temperature, low-pressure liquid refrigerant again. Then, the refrigerant enters the pre-cooling evaporator 1 again to absorb heat and evaporate, and so on.

[0025] After passing through the pre-cooled evaporator 1 and the gas-liquid separator 2, the low-temperature saturated treated gas will enter the adsorption tower (one of the first adsorption tower 3 or the second adsorption tower 4) in the adsorption working state. The moisture in the treated gas will be adsorbed on the surface of the adsorbent in the tower through the interaction force between the gas and the surface of the adsorbent. The treated gas dried by the adsorption tower will be discharged from the dryer outlet and enter the downstream gas-using unit.

[0026] In the first adsorption tower 3 and the second adsorption tower 4, when one adsorption tower is in the adsorption state, the other adsorption tower is in the regeneration state, that is, the two are in a cyclical alternation operation state. The two adsorption towers continuously dry the treated gas in a cycle, and continuously output clean compressed air. Specifically, the adsorbent regeneration process of the combined blower-type hot regeneration dryer includes four stages: depressurization, heating regeneration, cold blowing cooling and pressure equalization (standby).

[0027] Specifically, the working steps of the adsorption module are as follows:

[0028] 1. Adsorption: The treated gas enters the pre-cooling evaporator 1 through the dryer inlet and exchanges heat with the refrigerant in the refrigeration cycle to reduce the temperature. Then, it passes through the gas-liquid separator 2 to remove condensate and the adsorption tower to remove water before reaching the dryer outlet.

[0029] 2. Pressure relief: The inlet and outlet valves of the adsorption tower after the adsorption stage is completed are closed, and the compressed air in the adsorption tower is discharged to the ambient atmosphere through the silencer 7 until the pressure in the adsorption tower drops to the same as the ambient pressure; the silencer 7 is installed at the outlet end of the first adsorption tower 3 and the second adsorption tower 4.

[0030] III. Heating and Regeneration: Ambient air is drawn in by blower 5 and used as regeneration gas. The drawn-in regeneration gas is pressurized by blower 5 and then passes sequentially through accumulator 8, heat exchange device 11, and heater 6. When the regeneration gas passes through the accumulator, it exchanges heat with the heat storage medium in the accumulator, thereby raising the temperature of the regeneration gas. When the regeneration gas passes through heat exchange device 11, it exchanges heat with the high-temperature and high-pressure gaseous refrigerant in the refrigeration cycle, thereby raising the temperature of the regeneration gas a second time. When the regeneration gas passes through heater 6, heater 6 further heats the regeneration gas to the target temperature. The regeneration gas that has reached the target temperature enters the adsorption tower in the regeneration state, where the adsorbent in the adsorption tower is heated and dehydrated. The removed water is discharged to the ambient atmosphere through the second waste gas vent valve 13.

[0031] IV. Cold blowing and cooling: A small amount of finished gas from the dryer outlet enters the regenerated adsorption tower as cooling gas to reduce the temperature of the adsorbent in the adsorption tower. In the early stage of the cold blowing and cooling stage, the cooling gas exchanges heat with the adsorbent in the adsorption state, which has a higher temperature, and becomes a tail gas with a higher temperature. After leaving the tower, the tail gas carries a large amount of heat from the adsorbent and passes through the heat accumulator 8. The tail gas exchanges heat with the heat storage medium in the heat accumulator 8 and heats the heat storage medium. Then, the tail gas is discharged to the ambient atmosphere through the first waste gas vent valve 12. Some of the heat in the tail gas is absorbed by the heat storage medium in the heat accumulator. In the later stage of the cold blowing and cooling stage, the tail gas carries the remaining heat from the adsorbent after leaving the tower and is directly discharged to the ambient atmosphere through the second waste gas vent valve 13 without passing through the heat accumulator.

[0032] 5. Pressure equalization: Close the first waste gas vent valve 12 and the second waste gas vent valve 13. Part of the finished gas from the dryer outlet enters the adsorption tower in the regeneration state, so that the pressure in the adsorption tower gradually increases to the same as the pressure in the other adsorption tower.

[0033] Furthermore, a first bypass switching valve 14 is provided at the dryer inlet. The three ports on the first bypass switching valve 14 are respectively connected to the dryer inlet, the dryer outlet, and the processing gas inlet of the precooling evaporator 1. Under normal operating conditions, the first bypass switching valve 14 connects the dryer inlet and the precooling evaporator 1, and the processing gas is cooled and dried by the system. When the equipment fails, the first bypass switching valve 14 can directly connect the dryer inlet and the dryer outlet, thereby facilitating maintenance.

[0034] This utility model also includes a common skid base, on which the precooling evaporator 1, gas-liquid separator 2, first adsorption tower 3, second adsorption tower 4, and blower 5 are all fixedly installed. By setting the above-mentioned devices and components on the same common skid base, the integration level and overall integration of the entire equipment are improved.

[0035] The outer shells of the first adsorption tower 3, the second adsorption tower 4, the heat accumulator 8, and the heater 6 are all covered with a rock wool insulation layer with a thickness of 40mm-70mm.

[0036] In this embodiment, the heat accumulator 8 is a ceramic ball heat accumulator, which contains ceramic balls. The ceramic balls act as heat storage bodies. When the regenerated gas passes through the heat accumulator, the ambient atmosphere exchanges heat with the high-temperature ceramic balls, thereby increasing the temperature of the regenerated gas.

[0037] In this embodiment, the adsorbent sampled in the first adsorption tower 3 and the second adsorption tower 4 is activated alumina. Activated alumina is a porous, highly dispersed solid material with a large surface area. Its microporous surface possesses the characteristics required for catalytic activity, such as adsorption performance, surface activity, and excellent thermal stability. Activated alumina is a type of adsorbent, and its role in this device is to adsorb moisture entering the adsorption towers.

[0038] In some embodiments of this application, heater 6 is an electric heater or a steam heater.

[0039] In some embodiments of this application, the blower 5 is a variable frequency speed control blower, and the total pressure of the variable frequency speed control blower is not less than 15 kPa.

[0040] In some embodiments of this application, the refrigerant in the refrigeration cycle path is a hydrochlorofluorocarbon, hydrofluorocarbon, or hydrofluoroolefin refrigerant.

[0041] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A combined blower-type hot regeneration dryer, characterized in that, The system includes a dryer inlet, dryer outlet, pre-cooling evaporator, alternating adsorption module, refrigeration compressor, gas-liquid separator, blower, heat accumulator, heater, second waste gas vent valve, and throttling device. The alternating adsorption module includes a first adsorption tower and a second adsorption tower that operate alternately, with the inlets of the first and second adsorption towers connected to the second waste gas vent valve. The dryer inlet, pre-cooling evaporator, gas-liquid separator, alternating adsorption module, and dryer outlet are sequentially connected to form a cooling adsorption flow path. The blower, heat accumulator, heater, alternating adsorption module, and second waste gas vent valve are sequentially connected to form an ambient gas heating and regeneration flow path. The pre-cooling evaporator, refrigeration compressor, condenser, and throttling device form a refrigeration circulation flow path. The dryer outlet, alternating adsorption module, and first waste gas vent valve form a first finished gas cooling and blowing flow path.

2. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, The dryer outlet, alternating adsorption module, heat accumulator, and second waste gas vent valve form the second finished product gas cooling flow path.

3. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, A heat exchange device is provided between the refrigeration compressor and the condenser. The heat exchanger is provided with a first heat exchange inlet, a first heat exchange outlet corresponding to the first heat exchange inlet, a second heat exchange inlet, and a heat exchange outlet corresponding to the second heat exchange inlet. The outlet of the refrigeration compressor is connected to the first heat exchange inlet, and the first heat exchange outlet is connected to the inlet of the condenser. The heat accumulator is provided with a first inlet, a second inlet, a first outlet, and a second outlet. A blower is connected to the first inlet of the heat accumulator. The second inlet of the heat accumulator is connected to a heat accumulator heating pipeline. The inlets of the first adsorption tower and the second adsorption tower are simultaneously connected to a venting pipeline. A second bypass switching valve is provided between the venting pipeline, the heat accumulator heating pipeline, and the second waste gas venting valve. The first outlet of the heat accumulator is connected to the second heat exchange inlet of the heat exchange device, and the second outlet of the heat accumulator is connected to the first waste gas venting valve. The second heat exchange outlet of the heat exchange device is connected to a heater.

4. The combined blower-type hot regeneration dryer according to claim 3, characterized in that, The precooling evaporator is equipped with a processing gas inlet, a processing gas outlet, a refrigerant inlet, and a refrigerant outlet. The processing gas inlet of the precooling evaporator is connected to the dryer inlet, the processing gas outlet of the precooling evaporator is connected to the gas-liquid separator inlet, the refrigerant inlet of the precooling evaporator is connected to the condenser outlet, and the refrigerant outlet of the precooling evaporator is connected to the refrigeration compressor inlet. The outlet of the gas-liquid separator is connected to the inlet end of the first adsorption tower and the second adsorption tower, and the outlet end of the first adsorption tower and the second adsorption tower is connected to the dryer outlet.

5. The combined blower-type hot regeneration dryer according to claim 4, characterized in that, A first bypass switching valve is provided at the dryer inlet. The three ports on the first bypass switching valve are respectively connected to the dryer inlet, the dryer outlet and the treatment gas inlet of the precooling evaporator.

6. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, The heater is an electric heater or a steam heater.

7. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, The blower is a variable frequency speed control blower, and the total pressure of the variable frequency speed control blower is not less than 15 kPa.

8. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, The refrigerant in the refrigeration cycle is a hydrochlorofluorocarbon, hydrofluorocarbon, or hydrofluoroolefin refrigerant.

9. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, It also includes a common skid base, and the precooling evaporator, gas-liquid separator, first adsorption tower, second adsorption tower, and blower are all fixedly installed on the common skid base.

10. The combined blower-type hot regeneration dryer according to claim 1, characterized in that, The shells of the first adsorption tower, the second adsorption tower, the heat accumulator, and the heater are all covered with a rock wool insulation layer with a thickness of 40mm-70mm.

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