TWI303581B - Composite dehumidifying system for high pressure air - Google Patents

Description

1303581 IX. Description of the Invention: [Technical Field] The present invention relates to a high-pressure air freezing and dehumidifying system, and more particularly to a composite type in which a plurality of parallel frosters are connected in series with a pre-dehumidifier. High pressure air refrigeration dehumidification system. [Prior Art]

Air purification is a must-have procedure for many processes to obtain dry air with very low moisture content (eg 0.01%). After entering the molecular screening membrane, N2 and 〇2 are separately taken out, while some larger molecules such as C〇2 are Before the filter, but the small but non-inert water vapor has many adverse effects on the process, it cannot be screened by molecular membranes. The water molecules must be taken out of the humid air by means of dehumidification or freezing frost. This is a process air freezing technology. If the dehumidification method of water vaporizer condensation in the low-temperature surface air of the evaporator coil is used above freezing point, the water content of the humid air is still high due to the efficiency limitation of the heat mass transfer. When the air pressure is 700 kPa and the evaporator surface temperature is 5 °C, the ideal humidity ratio of the air passing through the thermodynamic calculation is about 0.00086. When the evaporator surface temperature is -15 °C, the ideal humidity ratio is about It is 0.00016, which is only 1/5 of the former. If the surface temperature drops to -25 °C, the ideal humidity ratio can reach 0.000053. Therefore, in the method of freezing and dehumidifying, the moisture content after air treatment can be less than 1/10000. However, the disadvantage of freezing and dehumidifying is that when it is operated for a long time, it needs a time defrosting. For example, a 24-hour operation requires defrosting one to three times, and the defrost cycle is determined by the amount of frosting. 0956-A21824TWF(N2); P55950041TW;chentf 5 1303581 The earliest high-pressure air freeze-drying, often with a thick cavity, internal unit for all dehumidification or frosting coils, as disclosed in British Patent GB893773, this design approach The compression chamber and the dehumidification device of the air compressor are integrated. The disadvantage is that the co-construction of the air compressor and the dehumidification system is serious. As long as one component fails, the cavity is disassembled and repaired, and the volume is too heavy and is not easy to carry out. Flexible combination.

In recent years, the design has gradually been processed in a combined manner, and is connected by a high-pressure pipeline to enhance the elastic space of the air purification treatment, and the smaller the pipeline, the smaller the thickness required for the same pressure, the safety improvement and the cost reduction, for example, Japanese Patent Publications JP 2002/253920, JP2002/267306, and JP2005/344543 'have been modularized and processed for high-pressure air drying'. This creative design has achieved functions such as improved safety and reduced size. The existing design, after running for a period of time, must be shut down for defrosting, and many wafer materials and biochemical processes need to run 24 hours, and the requirements for reducing air moisture content are getting higher and higher, so there must be other air freezing and dehumidification Designed to meet the requirements of many wafer materials and biochemical processes. SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a composite high-pressure air cold-bead dehumidification system which can be operated for 24 hours while taking into consideration dehumidification and defrosting. The invention is integrated with air conditioning dehumidification, double parallel circuit small cold The East system takes turns to dehumidify and dehumidify, and the variable frequency control method performs high-pressure air drying to achieve energy-saving, full-time operation and high quality requirements. 0956-A21824TWF(N2); P55950041TW;chentf 6 1303581 A preferred embodiment of the composite high pressure air freeze dehumidification system of the present invention includes a plurality of frosters 'the frosters are connected in parallel' and each froster is The evaporating temperature is less than Celsius, the high-pressure air enters several frosters in the frosters for frosting and dehumidification, and the other frosters defrost. The preferred embodiment further includes a plurality of valve bodies coupled to the frosters and corresponding to the frosters, the valve systems directing high pressure air into the frosters that are frosting for dehumidification And enclose other frosters for defrosting.

In the preferred embodiment described above, each froster includes a cavity and a dehumidification device that defrosts the high pressure air passing through the cavity. The dehumidification apparatus includes an evaporator, a condenser, a compressor, and a capillary. The evaporator, the condenser, the compressor and the capillary system are connected via a refrigerant pipeline, wherein the evaporator and the condenser are disposed in the cavity, and the high-pressure air is subjected to frosting and dehumidification through the evaporator, and then passes through the condenser to make the temperature. Pick up. The dehumidifying device further includes a heater disposed in the cavity, and the heater heats the cavity when the froster is closed for defrosting. The compressor can be a variable frequency compressor or a fixed frequency compressor. The preferred embodiment further includes a pre-dehumidifier connected in series to the parallel defrosters. The evaporating temperature of the pre-dehumidifier is greater than Celsius, and the high-pressure air is first condensed and dehumidified by a pre-dehumidifier. Frosting and dehumidification is then carried out through the frosters. In the above preferred embodiment, the pre-dehumidifier comprises a cavity, a dehumidifying device and a drain valve. The dehumidifying device dehumidifies the high-pressure air passing through the cavity, and the liquid water condensed from the high-pressure air is drained. Valve row 0956-A21824TWF (N2); P55950041TW; chentf 7 1303581 out of the cavity. In the above preferred embodiment, the dehumidifying apparatus comprises an evaporator, a condenser, a compressor and an expansion valve, and the evaporator, the condenser, the compressor and the expansion valve are connected in series via a refrigerant line, wherein the evaporation The condenser and the condenser are disposed in the cavity, and the high-pressure air is condensed and dehumidified through the evaporator, and then passed through the condenser to raise the temperature. The compressor can be a variable frequency compressor or a fixed frequency compressor.

In the preferred embodiment described above, the pre-dehumidifier further includes a temperature sensing element disposed in the cavity to sense the temperature in the cavity and thereby control the dehumidification device. The above and other objects, features, and advantages of the present invention will become more apparent and understood. The high pressure air refrigeration dehumidification system, as shown in Figure 1, includes a pre-dehumidifier 100 and two parallel defrosters 220, 240. Although the present embodiment is described by taking two defrosters as an example, the number of defrosters is not limited to two, and may be plural. Generally, under atmospheric conditions, the air compressor system (not shown) is pressurized, for example, pressurized to 1 to 10 bar (gage), preliminary air filtration, oil and gas filtration and the like. After the preliminary treatment of high-pressure air, the inlet end 101 of the pre-dehumidifier 100 is introduced (as indicated by the arrow of the dotted line), and the dehumidifier is first placed at an evaporating temperature above the freezing point 〇 ° C (evaporation temperature is about 0). ~101) Conduct the first phase 0956-A21824TWF (N2); P55950041TW; chentf 8 1303581

Cold spinning dehumidification. The rain dehumidifier 100 includes a first cavity i 2 , a first dehumidifying device 140 and a drain valve 18 , and the first dehumidifying device 14 includes a first evaporator 142 , a first condenser 144 , and a first dehumidifying device 14 . The expansion valve 146, the first compressor 148, the first evaporator 142, the expansion valve 146, the first condenser 144, and the first compressor 148 are connected in series by a refrigerant line, and the first line in the i-th diagram Indicates the flow of refrigerant. The first evaporator 142 and the first cold break 144 are disposed in the first cavity 12 , and the high-pressure air entering from the inlet end 1 依 1 sequentially passes through the coil of the first evaporator 142 and the first condenser 144 . The coil, when the high-pressure air passes through the coil of the first evaporator 142, since the surface temperature of the coil of the first evaporator 142 is not lower, there is no problem of freezing and frosting, and the water vapor in the air The surface of the coil of the first evaporator 142 is condensed into liquid water, and is slid into the first cavity 120 by gravity in a film-wise condensation or drop-wise condensation mode. At the bottom of the first chamber 12, a water collecting tray (not shown) is mounted on the bottom of the first chamber 12, and is drained to the outside of the first chamber no by a drain valve (floating valve member) 180, due to the first chamber 120. The pressure inside is higher than one atmosphere, so the condensed water in the air will discharge the first cavity 120 in a pressure difference mode, and the first stage dehumidification effect is achieved. At the inlet end 101 of the pre-dehumidifier 100, the inlet air pressure (P1), volume flow rate (VF1), temperature (T1), relative humidity (RH1) or wet bulb temperature are simultaneously measured, and then according to the desired air. The moisture content of the outlet (also the humidity ratio) to determine the required water removal and the required freezing capacity for dehumidification under different air flows. These estimates and the adjustment of the freezing capacity are determined by the variable frequency type 0956-A21824TWF (N2); P55950041 TW;chentf 9 1303581

The automatic control mechanism of a compressor 148 (including the frequency converter 149) and its refrigeration system is achieved, including the first compressor 148 speed control and the fine adjustment of the expansion valve 146 shown in FIG. 1 due to the air exit of the first evaporator 142 The relative humidity is often between 90 and 100%, the humidity signal is not required to be measured, and the feedback control parameter is automatically controlled by the temperature sensing component T2 for the first stage dehumidification. The dehumidifying device 140 further includes a pre-condenser 147 for reducing the temperature of the refrigerant at the outlet of the first compressor 148, so that the temperature of the air treated in the first stage is close to the temperature of the air at the inlet 1〇1, and The outer casing of the first cavity 120 must be insulated, in addition to preventing condensed water from the outer casing, which is a method of improving the energy efficiency of the dehumidification process. In the first stage, the air is condensed and dehumidified. The humidity ratio can be reduced from 0.001997 (700kPa/TDB25°C/RH70%) to 〇00086 (600kPa/TDB5°C/RH95%), and the flow rate is 3m3/min. The mass flow rate is about 3535kg/s, and the water removal rate is about 3.98xicr\g/s. At this time, the condensation latent heat and sensible heat of water vapor is about 2500kJ/kg, so the required cold> East capacity is about lkW (evaporation temperature is about 0~10°〇. If the humidity ratio has to be reduced to 2/10000 or less, the above-mentioned pre-dissection, crying, and 100 cannot be completed, so the present invention utilizes frosters 22 and 240 for freezing, such as As shown in Fig. 1, the first stage treated air is introduced into the froster 220 to dehumidify, and the second stage of freezing and dehumidification is performed. According to the above design example, the air mass flow rate is about 3535 kg/s, and the humidity ratio is determined by 〇. 〇〇〇86 (600kPa/TDB5°C/RH95%) down to 0.000163 (600kPa/TDB-15°C/RH95%), the second stage water removal rate is about 0956-A21824TWF(N2); P55950041 TWichentf 10 .Ϊ303581' 8 1 〇kg/s 'Water solidification latent heat and sensible heat about 340kj/kg, the required cold shower force is about 135W (the bursting temperature is about _15. 〇, ice can be used Use inverter compressor system (including compressor 2248 and inverter 2249), as shown in Figure 2. Since the froster 220, 240 runs for a period of time, the surface of the evaporator will be 2 full of frost, and the air passage will be narrowed. Even if it is clogged, it is necessary to periodically defrost. In the present invention, the two sets of frosters 220 and 240 alternately perform air removal and defrosting operations, and two sets of air solenoid valves 21〇/27〇 and _ 23 〇 / 280, to control the direction of air circulation (fonder 22 〇 or 24 〇), when the froster 220 performs frosting and dehumidification, the froster 24 〇 defrost. At this time, ~ phase 220 The compressor (as shown in Fig. 2) is activated, the valve body 21〇/27〇 is opened, and the exhaust valve 250 is closed; at this time, the compressor (not shown) of the froster 24〇 is closed, and the valve body 230/280 is closed. In order to perform defrosting, since δ generates a large amount of water helium during defrosting, in order to prevent the pressure from being excessively high in the defrosting process, the juice exhaust valve 260 is set (the froster 220 is the exhaust valve 25 〇), and the exhaust gas is exhausted at this time. The valve 26〇 is open to the atmosphere, and the ten frost process can be defrost by electric heating. If the compressor • stop time, the surrounding room temperature can be used. The natural melting defrosting can eliminate the need for electric defrosting. When the froster 220 and the froster 24 are intermodulated, the froster 24 that has just completed the defrosting does not need to open the valve body 23 The coffee 280 is closed, the exhaust valve is opened for a short period of time, the humid air that has just been defrosted in the froster 240 is discharged, and the compressor is started and maintained for a period of time, so that the operation of the froster 240 is stabilized. Thereafter, the valve body 230 is opened, the valve body 280 is opened, and the exhaust valve 26 is closed. The defrosting action of the froster 220 is performed after the high-pressure air is switched to dehumidification via the froster 240. 0956-A21824TWF(N2); P55950041TW;chentf.1303581 2 2 〇^ i /,,, and port as an example Figure 2 shows the structure of the froster 22〇, since the structure of the froster 250 is the same Therefore, only the froster 22 is clarified. The froster 220 includes a second cavity 222, a dehumidification device, and a heater 226. The dehumidification device 224 includes a second condenser, a second condenser, and a capillary f 2246.

And - Di two compressor 2248. The second evaporator (10) and the second condensation cry 2244 are disposed in the second cavity 222, and the high-pressure air from the first stage passes through the second evaporator 2242 and the second condenser 2244, due to the second evaporator 2242 When the coil temperature is lower, the moisture in the high-pressure air will be frosted on the coil of the second evaporator 2242, and the purpose of dehumidification is achieved, and the high-pressure air after being wet passes through the second condenser 2244 to make the temperature generally The temperature is restored to the temperature when entering the froster 220. The heater 226 is disposed in the second month working plate 222 and is electrically heated. When the froster needs to be defrosted, the heater 226 is used to heat the second evaporator 2242 coil to make the second evaporation 2242 disk. The frost on the tube melts into liquid water and is discharged to the outside of the second chamber 222 via the drain valve 228. The front condenser 2247 has the same function as the front condenser 147 in Fig. 2 and will not be described again. In the second cavity buckle, temperature sensors T3, T4, D5 respectively sense the inlet of the froster 22〇, the outlet of the first burst state 2242 coil, and the air temperature of the outlet of the froster 22 As the basis for implementation control. Further, although in the present embodiment, the first and second compressors are corrected and 2248 is a variable frequency compressor, a frequency air compressor may be used. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to be limited to the disclosure of the present invention, which is not limited to the spirit and scope of the present invention, without departing from the spirit and scope of the present invention. A number of changes and modifications may be made, and the scope of the invention is defined by the scope of the appended claims.

0956-A21824TWF(N2); P55950041 TW;chentf 13 1303581 [Simplified Schematic] FIG. 1 is a block diagram of the composite high-pressure air freezing and dehumidifying system of the present invention. Fig. 2 is a schematic view showing the structure of the froster in Fig. 1. [Main component symbol description] 100~pre-dehumidifier;

101~inlet end; 120~first cavity; 140~first dehumidification device; 142~first evaporator; 144~first condenser; 146~expansion valve; 147~pre-condenser; 148~first compression Machine; 149~inverter; 180~drain valve; 210, 230, 270, 280~ valve body; 220, 240~ froster; 250, 260~ exhaust valve; 222~ second cavity; 224~ second Dehumidification device; 226~heater; 228~drain valve; 2242~second evaporator; 0956-A21824TWF(N2); P55950041 TW;chentf 14 1303581 2244~ second condenser; 2246~capillary; 2247~ front condenser 2248 ~ 2nd compressor; 2249 ~ Inverter.

0956-A21824TWF(N2); P55950041TW;chentf 15

Claims (1)

, I3 03 silk J 4. . In the 32nd, please modify the scope of the patent. Amendment date: 97.9.25 r丨1 Nl .....................^ Years of the month <E|Repair (more) replacement page X. Patent application scope·· _ 1· A composite high-pressure air freezing and dehumidifying system, including a plurality of frosters, which are connected in parallel, and the evaporation temperature of the first frosting is less than 0 degrees Celsius, high pressure At least one frosting defroster is chilled and dehumidified by the air entering the frosting, and the frosted defroster is subjected to the degassing. The composite high pressure air as described in claim 1 a cold dehumidification system, which further includes a plurality of valve bodies connected to the frosters and corresponding to the frosters, the valve systems direct high pressure air into the frosting defroster for dehumidification, and The frosted froster is closed for defrosting. 3. The composite high pressure air cooling according to claim 1, wherein the east dehumidification system further comprises a pre-dehumidifier connected in series to the front end of the frosters, and the evaporation temperature of the pre-dehumidifier The system is larger than the Celsius temperature, and the air is first condensed and dehumidified by the pre-dehumidifier, and then cooled by the froster; the east is dehumidified. 4. The composite high-pressure air dehumidification system of claim 3, wherein the pre-dehumidifier comprises a first cavity, a second dehumidification device, and a drain valve, the first dehumidification device facing The high-pressure air is dehumidified, and the first cavity is discharged from the high-pressure air through the drain valve. U-liquid water system 5: The composite 34 air dehumidification system according to claim 4, wherein the first dehumidification device comprises a first - _ ^ ^ strip crying, a look at a condenser, a first a compressor and an expansion valve, the first of the first condenser, the first compressor and the expansion; the system: = a certain 16 π January and repair (more) is replacing the page pipeline and connected in series, wherein The first evaporator and the first condenser are disposed in the first cavity, and the high-pressure air is condensed and dehumidified through the first evaporator, and then the temperature is raised by the first condenser. 6. The composite high pressure air refrigeration dehumidification system of claim 5, wherein the first compressor is a variable frequency compressor. 7. The composite high pressure air refrigeration dehumidification system of claim 5, wherein the first compressor is a fixed frequency compressor. 8. The composite high-pressure air freezing and dehumidifying system according to claim 5, wherein the pre-dehumidifier further comprises a temperature sensing element disposed in the first cavity to sense the first cavity The temperature in the middle and thereby control the dehumidification device. 9. The composite high pressure air freeze dehumidification system of claim 8, wherein the temperature sensing element is disposed at an outlet of the first evaporator. 10. The composite high-pressure air freezing and dehumidifying system according to claim 1, wherein the froster comprises a second cavity and a second dehumidifying device, and the second dehumidifying device passes through the second cavity The high pressure air is frosted and dehumidified. 11. The composite high pressure air refrigeration dehumidification system of claim 10, wherein the second dehumidification device comprises a second evaporator, a second condenser, a second compressor, and a capillary tube, the first The second evaporator, the second condenser, the second compressor, and the capillary system are connected in series via a refrigerant pipeline, wherein the second evaporator and the second condenser are disposed in the second cavity, and the high pressure The air passes through the second evaporator for frosting and dehumidification, 17 1303581 ___ _______; "year, after repair (more) is replacing the page and then passing the second condenser to raise the temperature I, one ------J 12. The composite high pressure air freezing and dehumidifying system of claim 11, wherein the second dehumidifying device further comprises a heater disposed in the second cavity, when the froster is closed for removal In the case of a frost, the heater heats the second evaporator in the second chamber. 13. The composite high pressure air freezing and dehumidifying system according to claim 11, wherein the second compressor is a variable frequency compressor 14. If you apply for a special Item 11. The range of the high pressure air composite frozen dehumidification system, wherein the second compressor is a fixed-frequency compressor. 18