CN103604239A - Large-cold-storage gas expansion refrigerating system and refrigerating method thereof - Google Patents
Large-cold-storage gas expansion refrigerating system and refrigerating method thereof Download PDFInfo
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- CN103604239A CN103604239A CN201310578778.6A CN201310578778A CN103604239A CN 103604239 A CN103604239 A CN 103604239A CN 201310578778 A CN201310578778 A CN 201310578778A CN 103604239 A CN103604239 A CN 103604239A
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Abstract
The invention provides a large-cold-storage gas expansion refrigerating system and a refrigerating method thereof, aiming to solve the problem of Freon consumption during refrigerating of cold storages in the prior art. The refrigerating system comprises a gas inlet switching valve and a gas filter. The gas inlet switching valve is sequentially connected with a gas compressor and a gas heat exchanger. The gas heat exchanger is connected with a turbo expander connected with a cold air inlet pipe. The cold air inlet pipe is arranged in a cold storage which is further provided with a hot air outlet pipe. The hot air outlet pipe and the gas filter are connected with the gas heat exchanger. The air compressor and the gas inlet switching valve are connected with a PLC (programmable logic controller) control module. A cold-storage temperature probe is connected to the PLC control module. Since no refrigerating fluid is needed, damage of Freon to the atmospheric ozonosphere is avoided; through expansion by the turbo expander, gas temperature is lowered to required level, and time and heat loss of heat exchange steps are reduced.
Description
Technical field
The invention belongs to refrigerating field, be specifically related to a kind of large cold storage refrigeration system and refrigerating method thereof.
Background technology
Freon is the general name of several fluorine chloromethanes and fluorine chloric ethane.The air-conditioning of commonly using in our life, refrigerator, air conditioner etc. adopt freon to make cold-producing medium mostly.Due to freon stable chemical nature, and be organic matter, have do not fire, low toxicity, the characteristic such as dielectric constant is low, critical-temperature is high, easy liquefaction, thereby be widely used as the cold-producing medium of freezing equipment and conditioner.
Yet freon can consume ozone material in a large number, is the arch-criminal of depletion of the ozone layer.Freon is that 1920's is synthetic, and its stable chemical nature, does not have combustibility and toxicity, is taken as cold-producing medium, blowing agent and cleaning agent, is widely used in the fields such as household electrical appliance, foamed plastics, household chemicals, automobile, fire-fighting equipment.In the later stage eighties, the production of freon has reached peak, and output has reached 1,440,000 tons.Before freon carry out is controlled, the whole world has reached 2,000 ten thousand tons to the freon discharging in atmosphere.Because their average life spans in atmosphere reach centuries, so the major part of discharge is still stayed in atmosphere, wherein major part still rests on troposphere, and sub-fraction rises up into stratosphere.At the freon of troposphere quite stable, in rising, enter after stratosphere, under certain meteorological condition, can under the effect of intense UV rays, be decomposed, the chlorine atom that decomposition discharges, with ozone meeting chain-react, constantly destroys ozone molecule.Scientist estimates that a chlorine atom can destroy tens thousand of ozone molecules.
According to data, within 2003, ozone cavity area has reached 2,500 ten thousand square kilometres.After a large amount of losses of ozone layer quilt, the ability of ultraviolet radiation-absorbing weakens greatly, causes the ultraviolet ray that arrives earth surface obviously to increase, and brings many-sided harm to human health and ecological environment.According to one's analysis, Stratospheric ozone depletion 0.01%, the global cataractous incidence of disease will increase 0.6-0.8%, mean so cause that blind number will increase by 10,000 to 1.5 ten thousand people.
For this reason, China has put into effect a measure that is intended to Ozonosphere protection, will completely forbid and use freon after 2010.The schedule of formulating according to relevant department: will completely forbid material--the fluorine Lyons that produces and use ozone layer depletion to 2010 Nian， China.According to this schedule, China by since on July 1st, 1999 the production and consumption horizontal frozen in fluorine Lyons in the average level of 1995～1997 years, reduce year by year later.On January 1st, 2010, freon is banned use of by China.Yet because the cold-producing medium price of replacement fluorine Leon is high, and refrigeration can not show a candle to freon, so until August 1 in 2013 ， China still using freon.And according to relevant personnel's investigation, even the use amount of many decades Nei， China freon will still can remain high over the next several years, the situation of Ozonosphere protection also will be still very severe.
Conventional freezer refrigerating machine, to utilize freon as cold-producing medium, by compression freon, then heat exchanger heat exchange, the temperature of reduction freon, makes freon liquefaction, then pass through throttle effect, further reduce the temperature of freon, then the air in the freon of low temperature and freezer is adopted to wall-type heat exchange, to reduce the temperature in freezer.
Summary of the invention
The present invention proposes a kind of large cold storage gas expansion refrigeration system and refrigerating method thereof, has solved the problem that in prior art, freezer consumes freon in refrigeration.
Technical scheme of the present invention is achieved in that
A kind of large cold storage gas expansion refrigeration system, comprise gas feed transfer valve, also comprise pneumatic filter, gas feed transfer valve successively with gas compressor, gas heat exchanger is connected, gas heat exchanger is connected with turbo-expander, turbo-expander is connected with cold air blast pipe, cold air blast pipe is arranged in freezer, in freezer, be also provided with hot gas discharge pipe, hot gas discharge pipe is connected with gas heat exchanger, gas heat exchanger is also connected with pneumatic filter, gas compressor, gas feed transfer valve is all connected with PLC control module, in PLC control module, be connected with temperature of ice house probe.
Between described gas compressor and gas heat exchanger, be also provided with the dry transfer valve of gas, an output of the dry transfer valve of gas is connected with gas-drying apparatus, and the output of gas-drying apparatus is connected with gas heat exchanger.
Described hot gas discharge pipe is arranged on cold air blast pipe top.
Gas heat exchanger is also connected with gas emitting valve, and gas emitting valve is connected with PLC control module.
A large cold storage gas expansion refrigeration system refrigerating method, carries out in the following manner:
(1) gas filters out granule foreign and the dust in gas after pneumatic filter;
(2) gas after filtering enters gas compressor through gas feed transfer valve, enters gas heat exchanger after compressed;
(3) after the preliminary cooling of the gas in gas heat exchanger, enter the turbo-expander cooling of expanding, enter afterwards cold air blast pipe;
(4) cold air in cold air blast pipe is discharged in the middle of freezer, and thermal current in freezer is sent into gas heat exchanger after collecting by hot gas discharge pipe, again enters afterwards gas feed transfer valve.
In step (2), gas is divided into two kinds of forms after gas compressor compression, the first form is that aridity meets the requirements of gas and enters gas heat exchanger through the dry transfer valve of gas, the second form is that aridity gas not up to standard enters gas-drying apparatus through the dry transfer valve of gas and carries out humidity adjusting, enters afterwards gas heat exchanger again.
In step (4), from gas heat exchanger gas out, be divided into two kinds of forms, the first is that the foul smell in freezer bleeds off by gas emitting valve, and the second is containing the gas of foul smell, directly not get back to gas feed transfer valve, for next circulation ready.
The gas that enters pneumatic filter is air or nitrogen.
The present invention does not need to utilize any cold-producing medium, has avoided the destruction of freon to atmospheric ozone layer.Can by turbo-expander, expand directly by the clean gas compression after processing, gas temperature is reduced to required temperature, be then discharged in freezer and go, can reach the effect of fast-refrigerating, and reduce time and the thermal loss of heat exchange link.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is structural representation of the present invention.
Wherein: 1. gas feed transfer valve, 2. pneumatic filter, 3. gas compressor, 4. gas is dried transfer valve, 5. gas-drying apparatus, 6. gas heat exchanger, 7. turbo-expander, 8. freezer, 9. hot gas discharge pipe, 10. cold air blast pipe, 11. temperature of ice house probes, 12. gas emitting valves, 13.PLC control module.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not paying the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of large cold storage gas expansion refrigeration system, comprise gas feed transfer valve 1, also comprise pneumatic filter 2, gas feed transfer valve 1 successively with gas compressor 3, gas heat exchanger 6 is connected, gas heat exchanger 6 is connected with turbo-expander 7, turbo-expander 7 is connected with cold air blast pipe 10, cold air blast pipe 10 is arranged in freezer 8, in freezer 8, be also provided with hot gas discharge pipe 9, hot gas discharge pipe 9 is connected with gas heat exchanger 6, gas heat exchanger 6 is also connected with pneumatic filter 2, gas compressor 3, gas feed transfer valve 1 is all connected with PLC control module 13, in PLC control module 13, be connected with temperature of ice house probe 11.
The course of work of the present invention is as follows: first gas filter through pneumatic filter 2, remove granule foreign and dust wherein, by gas feed transfer valve 1, enter gas compressor 3 afterwards, the gas that is compressed into certain pressure is tentatively lowered the temperature through gas heat exchanger 6 again, the gas of preliminary cooling is reduced to below-40 ℃ under the effect of turbo-expander 7, cooling gas enters freezer 8 uniformly by cold air blast pipe 10 afterwards, after the thermal current rising in freezer enters gas heat exchanger 6 recovery colds by hot gas discharge pipe 9, again enter gas feed transfer valve 1 and enter circulation next time.Wherein, PLC control module 13 is accepted the temperature information of temperature of ice house probe 11, controls the work of gas feed transfer valve 1, gas compressor 3.
In big-and-middle-sized freezer, often deposit fresh fruit or vegetables, therefore, may there is requirement to the humidity of gas.Therefore, as of the present invention, preferably between described gas compressor 3 and gas heat exchanger 6, be also provided with the dry transfer valve 4 of gas, an output of the dry transfer valve 4 of gas is connected with gas-drying apparatus 5, and the output of gas-drying apparatus 5 is connected with gas heat exchanger 6.After arranging like this, can according to gas compressor 3 out the aridity of gas select, if gas humidity is suitable, gas is through directly entering gas heat exchanger 6 after the dry transfer valve 4 of gas, if gas is crossed as dry or humidity is excessive, gas compressor 3 gas out first regulates humidity through gas-drying apparatus 5, enters afterwards gas heat exchanger again.
Described hot gas discharge pipe 9 is arranged on cold air blast pipe 10 tops.
Some large cold storages will be done long-period freshness preserving to some fresh melon fruit vegetables and store, and the air entering in gas feed transfer valve 1 can be replaced by nitrogen.Nitrogen itself also can be used as refrigerant gas on the one hand; Can reduce oxygen content in freezer on the other hand, reduce the oxidation of fresh melon fruit vegetable, greatly prolong storage period.When using nitrogen, freezer 8 is interior may there are some muddy air etc., in cold storage procedure, need to first these gases be discharged.Therefore, as a step more of the present invention, improve, gas heat exchanger 6 is also connected with gas emitting valve 12, and gas emitting valve 12 is connected with PLC control module 13.In initial launch, first gas emitting valve 12 is opened like this, foul smell in freezer 8 is discharged, close afterwards gas emitting valve 12, gas more out in gas heat exchanger 6 is directly connected with gas feed transfer valve 1.PLC control module 13 can be controlled the work of gas emitting valve 12 and gas feed transfer valve 1.
In addition, according to the difference of the size of freezer 8, storage inside object, the treating capacity of gas-drying apparatus 5 can regulate, and can to gas humidity, regulate timely like this.
Large cold storage gas expansion refrigeration system refrigerating method of the present invention, carries out in the following manner:
(1) gas filters out granule foreign and the dust in gas after pneumatic filter 2;
(2) gas after filtering enters gas compressor 3 through gas feed transfer valve 1, enters gas heat exchanger 6 after compressed;
(3) gas in gas heat exchanger 6 enters turbo-expander 7 cooling of expanding after being lowered the temperature, and enters afterwards cold air blast pipe 10;
(4) cold air in cold air blast pipe 10 is discharged in the middle of freezer 8 uniformly, and thermal current in freezer 8 is sent into gas heat exchanger 6 after collecting by hot gas discharge pipe 9, again enters afterwards gas feed transfer valve 1.
As preferably, in step (2), gas is divided into two kinds of forms after gas compressor 3 compressions, the first form is that aridity meets the requirements of gas and enters gas heat exchanger 6 through the dry transfer valve 4 of gas, the second form is that aridity gas not up to standard enters gas-drying apparatus 5 through the dry transfer valve 4 of gas and carries out humidity adjusting, enters afterwards gas heat exchanger 6 again.
As a step is preferred again, in step (4), from gas heat exchanger 6 gas out, be divided into two kinds of forms, the first is that the foul smell in freezer bleeds off by gas emitting valve 12, and the second is containing the gas of foul smell, directly not get back to gas feed transfer valve, for next circulation ready.
The present invention has following advantage:
1, the present invention adopts expansion of compressed gas Refrigeration Technique, directly gas self temperature is reduced to low-temperature condition, does not need the cold-producing mediums such as freon as refrigeration medium;
2, can replace air with pure nitrogen gas, as refrigerant gas, nitrogen also can play the effect of long term insurnace simultaneously;
3, supporting gas-drying apparatus 5 in system, can to gas, carry out suitable dry processing according to the humidity indicating value in freezer, guarantee that the water content in freezer maintains suitable amount, avoid water content too much and frosting is serious, the very few chilled goods lack of water that causes of water content.
4, complete equipment configuration is simple, and cost of investment is low, and easy to operate.
5, directly by expansion of compressed gas, freeze to reduce gas temperature, cooling rate is fast; Temperature-fall period does not need heat exchange, has reduced the loss of refrigeration capacity of heat transfer process, reduces energy consumption.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a large cold storage gas expansion refrigeration system, comprise gas feed transfer valve (1), it is characterized in that: also comprise pneumatic filter (2), gas feed transfer valve (1) successively with gas compressor (3), gas heat exchanger (6) is connected, gas heat exchanger (6) is connected with turbo-expander (7), turbo-expander (7) is connected with cold air blast pipe (10), cold air blast pipe (10) is arranged in freezer (8), in freezer (8), be also provided with hot gas discharge pipe (9), hot gas discharge pipe (9) is connected with gas heat exchanger (6), gas heat exchanger (6) is also connected with pneumatic filter (2), gas compressor (3), gas feed transfer valve (1) is all connected with PLC control module (13), in PLC control module (13), be connected with temperature of ice house probe (11).
2. large cold storage gas expansion refrigeration system according to claim 1, it is characterized in that: between described gas compressor (3) and gas heat exchanger (6), be also provided with the dry transfer valve (4) of gas, the output that gas is dried transfer valve (4) is connected with gas-drying apparatus (5), and the output of gas-drying apparatus (5) is connected with gas heat exchanger (6).
3. large cold storage gas expansion refrigeration system according to claim 1, is characterized in that: described hot gas discharge pipe (9) is arranged on cold air blast pipe (10) top.
4. according to the large cold storage gas expansion refrigeration system one of claim 1～3 Suo Shu, it is characterized in that: gas heat exchanger (6) is also connected with gas emitting valve (12), gas emitting valve (12) is connected with PLC control module (13).
5. a large cold storage gas expansion refrigeration system refrigerating method, it is characterized in that carrying out in the following manner:
(1) gas filters out granule foreign and the dust in gas after pneumatic filter (2);
(2) gas after filtering enters gas compressor (3) through gas feed transfer valve (1), enters gas heat exchanger (6) after compressed;
(3) after the preliminary cooling of the gas in gas heat exchanger (6), enter turbo-expander (7) cooling of expanding, enter afterwards cold air blast pipe (10);
(4) cold air in cold air blast pipe (10) is discharged in the middle of freezer (8), and thermal current in freezer (8) is sent into gas heat exchanger (6) after by hot gas discharge pipe (9) collection, again enters afterwards gas feed transfer valve (1).
6. large cold storage gas expansion refrigeration system refrigerating method according to claim 5, it is characterized in that: in step (2), gas is divided into two kinds of forms after gas compressor (3) compression, the first form is that aridity meets the requirements of gas and enters gas heat exchanger (6) through the dry transfer valve (4) of gas, the second form is that aridity gas not up to standard enters gas-drying apparatus (5) through the dry transfer valve (4) of gas and carries out humidity adjusting, enters afterwards gas heat exchanger (6) again.
7. large cold storage gas expansion refrigeration system refrigerating method according to claim 5, it is characterized in that: in step (4), from gas heat exchanger (6) gas out, be divided into two kinds of forms, the first is that the foul smell in freezer (8) bleeds off by gas emitting valve (12), the second is containing the gas of foul smell, directly not get back to gas feed transfer valve (1), for next circulation ready.
8. according to the large cold storage gas expansion refrigeration system refrigerating method one of claim 5～7 Suo Shu, it is characterized in that: the gas that enters pneumatic filter (2) is air or nitrogen.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107940618A (en) * | 2017-12-23 | 2018-04-20 | 新兴铸管股份有限公司 | A kind of environment protction type central air-conditioning system |
| CN107965962A (en) * | 2017-12-27 | 2018-04-27 | 杭州锦华气体设备有限公司 | A kind of air refrigerant low-temperature quick-freezing refrigeration system |
| CN112316999A (en) * | 2020-11-16 | 2021-02-05 | 中科赛凌（北京）科技有限公司 | High-low temperature test box |
| CN113154770A (en) * | 2021-02-10 | 2021-07-23 | 西安交通大学 | Refrigeration house refrigerating system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113154770B (en) * | 2021-02-10 | 2022-08-05 | 西安交通大学 | Refrigeration house refrigerating system |
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| CN103604239B (en) | 2016-01-20 |
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Effective date of registration: 20230317 Address after: No. 73, Beidou Avenue, Zhejiang Longyou Economic Development Zone, Longyou County, Quzhou City, Zhejiang Province, 324404 Patentee after: Zhejiang Jinhua Air Separation Equipment Co.,Ltd. Address before: Room 802, No. 707, Jianguo North Road, Xiacheng District, Hangzhou City, Zhejiang Province, 310003 Patentee before: HANGZHOU JINHUA GAS EQUIPMENT Co.,Ltd. |