CN1344577A - Industrial gas drying method - Google Patents
Industrial gas drying method Download PDFInfo
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- CN1344577A CN1344577A CN 01107267 CN01107267A CN1344577A CN 1344577 A CN1344577 A CN 1344577A CN 01107267 CN01107267 CN 01107267 CN 01107267 A CN01107267 A CN 01107267A CN 1344577 A CN1344577 A CN 1344577A
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Abstract
The industrial gas drying method includes two sets, one for high temperature and another low temperature, of refrigerating circulations and drying circulations. The refrigerating circulations adopt refrigerant R22 and R13 respectively and some expanding contains is set to regulate refrigerating amount and recover refrigerant while stopping. The method can provide dry and fresh air at dew point as minus 50 to minus 60 deg.c for the overhaul of transformer and others. The technological process of the present invention is advanced and reliable. Providing dry and low dew point air during overhaul can protect the transformer windings from being affected with damp and maintain the positive pressure state inside the transformer.
Description
The utility model belongs to the drying means of a kind of electric power, electronics, mechanical industry usefulness gas, and particularly a kind of have automatically continuously the non-interruptible supply dew-point temperature in the method for-50～-60 ℃ of dry gas.To the air feed drying of coil, and transformer production factory is to the drying of transformer when being particularly useful for the maintenance of power plant, power station, electric power system transformer and generating set.Be applicable to that also electronics, the closed factory building of mechanical industry, food product packets the place such as decorate and supply with dry gas.
Along with the develop rapidly of electric utility, power system changes the Totally-enclosed-type transformer with transformer into gradually from the core-adjustable type transformer in past.Behind the transformer operation certain hour,, have a strong impact on the insulating properties of transformer, remove these dirts,, can be removed by the method for transferring core for the core-adjustable type transformer because the long-term use of oil will produce ageing products such as greasy filth, free carbon; But for closed transformer, operating personnel must enter inside by manhole and can overhaul transformer.Therefore, satisfy the operating personnel that enter the transformer internal overhaul and obtain needed fresh air, the transformer coil drying after guaranteeing simultaneously to overhaul, generally adopt following dual mode: the one, adopt air compressor to supply with general wet air, Awaiting Overhaul finishes, by the drying out by circulating hot oil coil, this method easily makes coil make moist and corrosion between turn(a)round again, and, the drying out by circulating hot oil of coil needs continuous a couple of days, and the prolongation of power off time will cause unnecessary economic loss; The 2nd, adopt the method for freezing, make wet air the time by the refrigeration unit evaporimeter, airborne moisture content form with frost under low-temperature condition is condensed in the evaporimeter, dry gas feeds the transformer of Awaiting Overhaul, satisfy the operating personnel that enter the transformer internal overhaul and obtain fresh air, and avoid coil to make moist.But this drying means is owing to adopt two-stage combined type compression refrigeration circulation, warm cold-producing medium R during the used cold-producing medium of high pressure and low pressure compressor is
22(chlorodifluoromethane), behind the bleeder heater of low pressure compressor system, directly be connected, to provide dry gas to the body that is dried with the drying system that comprises air cleaner, blower fan, air intlet heater, heat exchange of heat pipe, purging defrost magnetic valve, air outlet slit magnetic valve and outlet heater.Its cryogenic temperature (evaporating temperature under the cold-producing medium normal pressure is-40.8 ℃) can't meet the requirements of low temperature, the dry air dew point temperature of handling of drying machine only is-25～-35 ℃, transformer coil after the maintenance can not obtain efficient drying, still need pass through drying out by circulating hot oil; And, because what the refrigeration compressor of this type of drying means and drying device thereof adopted is accessible compressor, start shooting forward and backwardly stop valve air-breathing, exhaust outlet must be closed respectively, open-minded, frequently open and close stop valve and very easily cause cold-producing medium to leak, cause potential safety hazard; In addition, this drying means adopts roots blower to carry air, and this blower fan one is that capacity is too little, invade at the humid air that the Repair of Transformer hole phase of opening and closing is difficult to stop in the atmosphere, and the 2nd, noise is too big.
The purpose of this utility model is a kind of automatic drying method that can move voluntarily and successively supply with the industrial gas of-50～-60 ℃ of dew-point temperatures of design, so that the desired dew-point temperature that makes the transformer coil surrounding air fresh below-50 ℃ can be provided when maintenance such as transformer, dry air, both avoid transformer coil to make moist to reach, can satisfy the required fresh air of maintainer again, guarantee simultaneously to keep malleation in the transformer in unlatching of Repair of Transformer hole or down periods, prevent the humid air intrusion in the atmosphere, and drying process operational efficiency height, safety, purpose such as reliable.
Solution of the present invention is the combined type refrigeration with background technology, improvement is designed to the cascade refrigeration circulation, promptly set up a cryogenic refrigerating system between first order refrigeration system and drying system, first order refrigeration system is high temp, refrigerating system for this system, and two systems adopt R respectively
22, R
13(Freon 13) is as cold-producing medium.The cold-producing medium that act as the cooling cryogenic refrigerating system of high temp, refrigerating system; Cryogenic refrigerating system then carries out low temperature drying by its evaporimeter etc. to the gas that is dried to be handled, thereby reaches its purpose.Therefore, the present invention includes:
A, cooling cryogenic refrigerating system cold-producing medium:
A. by the R of high-temperature systems compressor compresses output
22Refrigerant vapour is after oil eliminator separates lubricating oil, and again through the cooler precooling, the cold liquid after its precooling is imported R after liquid reservoir and device for drying and filtering processing
22Gas-liquid heat exchanger is cooled to subcooled liquid once more, and this subcooled liquid is sent into the devaporizer cavity with the low-temperature refrigerant R of cool stream in this devaporizer heat exchanger tube through heating power expansion valve
13To-40～-50 ℃;
B. the rapid R of evaporation after heat exchange
22Opposing steam flow is through R
22Behind the gas-liquid heat exchanger cavity, enter next working cycles by high temperature compressed machine suction again;
B, sub-cooled air are to dehumidify:
A. the R by cryogenic refrigeration compressor compresses output
13Refrigerant vapour is through cryogenic system oil eliminator separation lubricating oil, again through R
13Overheated cooler precooling and enter devaporizer and be cooled to cryogenic liquid, this cryogenic liquid R that flows through again
13Gas-liquid heat exchanger further was cooled to cold R
13Liquid is after this subcooled liquid drying filtration treatment, send into evaporimeter through heating power expansion valve again and the air of its cavity of flowing through is cooled to is lower than-70 ℃ to remove airborne moisture;
B. the R that after evaporator operation, flows out
13Cold-producing medium, refluxing is sucked by the cryogenic refrigeration compressor through the devaporizer cavity, enters next working cycles;
C, the dry processing of gas: the humid air under the environment temperature is after the air cleaner filtration treatment, by pressure air pump input heat exchange of heat pipe cavity precooling (just dry), air after the precooling is sent into the evaporimeter cavity again and is cooled to and is lower than-70 ℃ to remove airborne moisture, then, send into heat exchanger tube in the heat exchange of heat pipe again; Behind the air precooling to its cavity of flowing through, be-50～-60 ℃ fresh, dry air again through magnetic valve and air outlet slit heater output dew-point temperature.
For the maloperation effectively avoiding may occurring before and after the background technology start and repeatedly the open and close stop valve easily cause the generation of problem such as cold-producing medium leakage, set up an expansion vessel at cryogenic refrigeration compressor inlet end and with automatic adjusting refrigerating capacity and when shutting down cold-producing medium got back in the expansion vessel automatically to store.For regular defrosting, at the inlet end of evaporimeter and heat exchange of heat pipe cavity heater is set respectively, regularly heat defrost.And handle in order to ensure continuously gas being carried out drying, be set up in parallel two cover evaporimeters and heat exchange of heat pipe and corresponding heater, valve, and adopt identical technological process alternate run, continuously providing dew-point temperature with this is-50～-60 ℃ dry gas.The technological process of whole drying system is carried out full-automatic programme-control by the PLG Programmable Logic Controller.
The present invention is owing to adopt high and low temperature two-stage superposition type cycle refrigeration system, warm cold-producing medium R during high temp, refrigerating system adopts
22The precooling of cryogenic system cold-producing medium, cryogenic system are adopted low-temperature refrigerant R
13Its minimum evaporating temperature reaches-80～-90 ℃, can make the gas dew-point temperature after evaporator dry that is dried reach-50～-60 ℃, than low 25～35 ℃ of combination type drying machines, when guaranteeing that the Repair of Transformer personnel obtain required fresh, dry air, the dew-point temperature of transformer coil surrounding air is reached below-50 ℃, the water capacity of air is in the permissible value scope, thereby can effectively avoid coil to make moist, save disadvantages such as also needing be undertaken drying after the background technology maintenance by Circulation and Hot Oil Spray.Set up the expansion vessel of regulating refrigerating capacity and reclaiming storing refrigerant when shutting down at the cryogenic compressor inlet end, compressor is inhaled, the exhaust outlet stop valve just is in normally open and only be used for refrigeration system vacuumizes with refrigerant feeding and uses; Both can avoid maloperation occurring before and after the start, can avoid the leakage of cold-producing medium again.Pressure fan change into the pressure air pump not only blast pressure can bring up to 105kPa, guarantee during the Repair of Transformer hole opens or closes to keep being in barotropic state in the transformer, prevent that the humid air in the atmosphere from invading.But and adopt the drying system of alternate run of two cover same process flows, can guarantee that then it is-50～-60 ℃ dry gas that drying machine is continuously supplied with dew-point temperature.Thereby the present invention has technological process advanced person, reliable, required fresh, dry air in the time of can effectively satisfying maintenance such as transformer, the dew-point temperature of guaranteeing its coil surrounding air reaches below-50 ℃, and the air water capacity avoids transformer coil to make moist in the permissible value scope; Keep during the Repair of Transformer hole is opened or closed being in barotropic state inside and outside the transformer, prevent characteristics such as humid air intrusion.
Accompanying drawing and description of drawings
Fig. 1, for process flow diagram of the present invention;
Among the figure: 1. high temperature refrigeration compressor, 1A, 1B, 1C: stop valve, 2. high-temperature systems oil eliminator, 3. cooler, 4. liquid reservoir, 5.R
22Device for drying and filtering, 6. air inlet magnetic valve, 7.R
22Gas-liquid heat exchanger, 8. heating power expansion valve, 9. stop valve, 10. devaporizer, 11. cryogenic refrigeration compressors, 11A, 11B, 11C, 11D: stop valve, 12. cryogenic system oil eliminators, 13.R
13Overheated cooler, 14.R
13Gas-liquid heat exchanger, 15.R
13Device for drying and filtering, 16. expansion vessels, 17.R
13Heating power expansion valve, 18. stop valve, 19～1,19～2: evaporimeter air inlet magnetic valve, 20～1,20～2: evaporimeter, 21～1,21～2: the evaporimeter defrosting heater, 22～1,22～2: heat exchange of heat pipe, 23～1,23～2: heat exchange of heat pipe defrosting heater, 24. pressure air pumps, 25. air cleaner, 26～1,26～2: heat exchange of heat pipe defrost magnetic valve, 27～1,27～2: air outlet slit magnetic valve, 28. outlet air heaters.
Embodiment
Present embodiment is 40m with the dry flow
3The gas drier of/h is an example: high temperature refrigeration compressor 1 adopts the fully closed compressor of power 7.5kw, cooler 3 heat exchange area 450m
2, R
22Gas-liquid heat exchanger 7 heat exchange area 0.12m
2, devaporizer 10 heat exchange power 6kw, stop valve 9 heating power expansion valves 8 are DN8.Cryogenic compressor 11 also adopts the fully closed compressor of power 7.5kw, R
13Overheated cooler heat exchange area 10m
2, R
13Gas-liquid heat exchanger 14 heat exchange area 0.12m
2, feed flow cryogenic globe valve 18, R
13Heating power expansion valve 17 is DN8, and present embodiment adopts two cover drying system wheels to change jobs, and evaporimeter 20～1,20～2 heat exchange areas are 42m
2, heat exchange of heat pipe 22～1,22～2, heat exchange area is 30m
2, pressure air pump 24 power 1.1kw, distribution pressure 105kPa, flow 40m
3/ h, evaporimeter defrosting heater 21～1,21～2 power 1kw, heat exchange of heat pipe defrosting heater 23～1.23～2 power also are 1kw, outlet air heater 28 power 5kw, air outlet slit magnetic valve 27～1,27～2 is DN32, and defrost magnetic valve 26～1,26～2 is DN20; Present embodiment adopts full-automatic electrical equipment switch board to carry out overall process by the PLC Programmable Logic Controller and controls automatically.
Claims (5)
1, a kind of drying means of industrial gas; It is characterized in that this drying means comprises:
A, cooling cryogenic refrigerating system cold-producing medium:
A. by the R of high-temperature systems compressor compresses output
22Refrigerant vapour is after oil eliminator separates lubricating oil, and again through the cooler precooling, the cold liquid after its precooling is imported R after liquid reservoir and device for drying and filtering processing
22Gas-liquid heat exchanger is cooled to subcooled liquid once more, and this subcooled liquid is sent into the devaporizer cavity with the low-temperature refrigerant R of cool stream in this devaporizer heat exchanger tube through heating power expansion valve
13To-40～-50 ℃;
B. the rapid R of evaporation after heat exchange
22Opposing steam flow is through R
22Behind the gas-liquid heat exchanger cavity, enter next working cycles by high temperature compressed machine suction again;
B, sub-cooled air are to dehumidify:
A. the R by cryogenic refrigeration compressor compresses output
13Refrigerant vapour is through cryogenic system oil eliminator separation lubricating oil, again through R
13Overheated cooler precooling and enter devaporizer and be cooled to cryogenic liquid, this cryogenic liquid R that flows through again
13Gas-liquid heat exchanger further was cooled to cold R
13Liquid is after this subcooled liquid drying filtration treatment, send into evaporimeter through heating power expansion valve again and the air of its cavity of flowing through is cooled to is lower than-70 ℃ to remove airborne moisture;
B. the R that after evaporator operation, flows out
13Cold-producing medium, refluxing is sucked by the cryogenic refrigeration compressor through the devaporizer cavity, enters next working cycles;
C, the dry processing of gas: the humid air under the environment temperature is after the air cleaner filtration treatment, by the precooling of pressure air pump input heat exchange of heat pipe cavity, air after the precooling is sent into the evaporimeter cavity again and is cooled to and is lower than-70 ℃ to remove airborne moisture, then, send into the heat exchanger tube in the heat exchange of heat pipe again, behind the air precooling to its cavity of flowing through, be-50～-60 ℃ fresh, dry air again through magnetic valve and air outlet slit heater output dew-point temperature.
2, press the drying means of the described industrial gas of claim 1; It is characterized in that when cryogenic refrigeration compressor inlet end is set up an expansion vessel with automatic adjusting refrigerating capacity and shutdown cold-producing medium being got back in the expansion vessel automatically stores.
3, press the drying means of the described industrial gas of claim 1; It is characterized in that heater being set respectively, regularly heat defrost at the inlet end of evaporimeter and heat exchange of heat pipe cavity.
4, press the drying means of the described industrial gas of claim 1; It is characterized in that this drying means is set up in parallel two cover evaporimeters and heat exchange of heat pipes and corresponding heater, valve, adopting identical technological process alternate run continuously to provide dew-point temperature with this is-50～-60 ℃ dry gas.
5, by the drying means of the described industrial gas of claim 1, it is characterized in that the technological process of whole drying system is carried out full-automatic programme-control by the PLG Programmable Logic Controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011072679A CN1164343C (en) | 2001-03-20 | 2001-03-20 | Industrial gas drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011072679A CN1164343C (en) | 2001-03-20 | 2001-03-20 | Industrial gas drying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1344577A true CN1344577A (en) | 2002-04-17 |
| CN1164343C CN1164343C (en) | 2004-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011072679A Expired - Fee Related CN1164343C (en) | 2001-03-20 | 2001-03-20 | Industrial gas drying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1164343C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106457131A (en) * | 2014-05-09 | 2017-02-22 | 阿特拉斯·科普柯空气动力股份有限公司 | Method and device for cool-drying a gas with circulating cooling liquid with bypass line |
| CN110953176A (en) * | 2018-09-26 | 2020-04-03 | 上海梅山钢铁股份有限公司 | Adjustment control method for improving dew point temperature of compressed air |
-
2001
- 2001-03-20 CN CNB011072679A patent/CN1164343C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106457131A (en) * | 2014-05-09 | 2017-02-22 | 阿特拉斯·科普柯空气动力股份有限公司 | Method and device for cool-drying a gas with circulating cooling liquid with bypass line |
| CN106457131B (en) * | 2014-05-09 | 2019-05-21 | 阿特拉斯·科普柯空气动力股份有限公司 | The method and apparatus for keeping gas cooling dry |
| CN110953176A (en) * | 2018-09-26 | 2020-04-03 | 上海梅山钢铁股份有限公司 | Adjustment control method for improving dew point temperature of compressed air |
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| Publication number | Publication date |
|---|---|
| CN1164343C (en) | 2004-09-01 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |