CN202835898U - Cascade type refrigeration system for oil and gas recovery - Google Patents
Cascade type refrigeration system for oil and gas recovery Download PDFInfo
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- CN202835898U CN202835898U CN 201220260295 CN201220260295U CN202835898U CN 202835898 U CN202835898 U CN 202835898U CN 201220260295 CN201220260295 CN 201220260295 CN 201220260295 U CN201220260295 U CN 201220260295U CN 202835898 U CN202835898 U CN 202835898U
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Abstract
The utility model relates to a cascade type refrigeration system for oil and gas recovery. The cascade type refrigeration system comprises a first level refrigeration system, a second level refrigeration system and a third level refrigeration system, wherein the first level refrigeration system is connected with the second level refrigeration system, and the second level refrigeration system is connected with the third level refrigeration system. The first level refrigeration system comprises a first level compressor, a first level air condenser, a first level throttling gear and a first level evaporator. The second level refrigeration system comprises a second level compressor, a second level air condenser, a second level throttling gear and a second level evaporator. The third level refrigeration system comprises a third level compressor, a third level air condenser, a third level throttling gear and a third level evaporator. The cascade type refrigeration system for the oil and gas recovery has the advantages that not only is defrosting time saved greatly, but also security is achieved. The cascade type refrigeration system for the oil and gas recovery is beneficial to environmental protection.
Description
Technical field
The utility model relates to a kind of refrigeration system, particularly relates to the staged refrigeration system that a kind of oil gas reclaims.
Background technology
In the prior art; when volatile chemical steam is reclaimed; in order to control the concentration of tail gas; usually can use the COMBINED PROCESS of several recovery methods; add absorbing process such as condensation; condensation adds membrane separation process, and compression adds condensation process, and above recovery technology all need to be take the condensation method recovery technology as the basis.
Reclaim for oil gas, condensation method refers at loading and unloading gasoline and in to the process of group refueling, the petrol gas that volatilizees is collected, and makes oil gas change liquid state into from gaseous state by cryogenic condensation, again becomes gasoline, reaches the purpose of recycling.
Traditional condensation method technique is comprised of the preposition precool heat exchanger device that utilizes the low temperature exhaust gas cold and the cooling of two-stage afterwards, one-level condensation temperature general control is at 3 ℃～5 ℃, make it as far as possible near 0 ℃ and be higher than 0 ℃, remove to greatest extent aqueous water and don't extremely icing at heat exchanger, secondary needs-40 ℃～-60 ℃ low temperature usually, hydrocarbon content is dropped in the certain value, the technique (being generally absorption method technique) of further oil gas being processed with after convenient finally makes exhaust of oil satisfy the requirement of national standard NMHC content≤25g/m3.The low temperature that needs for obtaining above-mentioned secondary oil gas condensation, its refrigeration system often adopts the form of binary cascade refrigeration.
Because oil-gas recovery device just just moves when loading and unloading oils, only worked 2～8 hours general every day, so special molecular sieve dehydration device is not set before the general device.Remove to greatest extent aqueous water and only control near the temperature of 0 ℃ (being generally 3～5 ℃) by the one-level oil gas condensation as far as possible, make the secondary oil gas condensation can adhere to again capable defrost of a period of time more.
On the one hand: when the design oil-gas recovery device, the device processes ability is normally with reference to Q/SH0117-2007 " gas recovery system for oil engineering guide rule ", select simultaneously about 80% (guide rule stipulates that this coefficient gets 0.6～1.0, and designing unit all can select 0.8～1.0 usually) designed of hair oil amounts of all oil filling risers.And actual oil depot is in loading and unloading oils; it usually is not timing; mostly all come a car to send out a car in the situation; oil-gas recovery device has not performance of surplus capacity at this moment; one-level oil gas condensation system particularly; because aforementioned technological reason; need to be controlled at 3～5 ℃ to temperature; general one-level oil gas refrigeration system all is directly to adopt the unit kind of refrigeration cycle now; realize the control of one-level temperature by continuous start-stop refrigeration machine or control liquid supply electromagnetic valve; like this in far below the situation of the former Design cooling load of oil-gas recovery device during loading and unloading oils; the one-level refrigeration system is usually only worked two or three minutes; primary oil temperature degree just drops to below 0 ℃, and refrigeration system has to shut down, and the evaporating temperature of one-level refrigeration system reality often is lower than 0 ℃ at this moment; the continuous unlatching of one-level refrigeration machine and stopping; cause primary oil temperature degree fluctuation, do not have the effect of well dewatering, the risk of bringing on the contrary one-level oil gas condensation system to freeze.
And to frequency conversion or the cylinder Unloading Technology of one-level refrigeration machine, can make preferably the load coupling, but since the cost relation almost adopt without any producer in the market; Can control refrigerant system capacity by the lower-cost way of refrigeration system bypass-unloading that makes, the better control of one-level temperature when maintaining underload, but a stage compressor still can continuous operation, and compressor has been done a lot of idle works.
On the other hand: the solution that the secondary oil-gas condenser freezes when worst cold case of traditional condensation method has become a difficult problem.
The problem that freezes that reclaims in order to solve condensation method oil gas has following several method defrosting usually:
1, electrothermal way:
When the oil-gas recovery device standby, in the air-introduced machine outlet electric heater is set, when needs defrosted, the V1 valve was opened, and air-introduced machine sucks the air of bypass, air is heated in electrical heating place, hot-air flows into the firsts and seconds oil-gas condenser, and one-level secondary oil gas condensation actuator temperature rises to more than 0 ℃, and the method is simple to operation, but relatively power consumption, so general supplementary means as other Defrost modes.(also the handlebar heating tape directly be entangled in one, on the level oil-gas condenser, because the I and II oil-gas condenser all is cryogenic heat exchanger, need to be with insulations such as polyurethane foams, so the heating element heaters such as heating tape directly heat in the insulation of foaming, very dangerous, and the heating tape of heating, companion's hot plate etc. need to be according to heat exchanger shape particular design, so seldom adopt)
2, the contrary circular flow of one-level refrigeration system, the heating first-stage condenser, the hot blast defrost that secondary condenser utilizes first-stage condenser to blow, during loading and unloading gasoline, the defeated oil gas of collection is introduced device for recovering oil and gas to oil gas by air-introduced machine, oil gas carries out heat exchange with secondary condenser low temperature exhaust gas out in preposition forecooler, make the oil gas temperature drop to 10 ℃～20 ℃, and then enter first-stage condenser and continue cooling, make the oil gas temperature be down to 3 ℃～5 ℃, the fluid oil that condensation is got off enters the temporary knockout drum of oil gas; Entering secondary condenser by the oil gas after the first-stage condenser cooling further lowers the temperature again, make the oil gas temperature be down to-40 ℃～-60 ℃, most of oil gas is condensed into liquid and enters the temporary knockout drum of oil product at this, the tail gas of low temperature enters preposition forecooler after converging with the gas that volatilizes from the temporary knockout drum of oil product, carries out emptying after the heat exchange with the oil gas of discharging from air-introduced machine or enters subsequent treatment (charcoal absorption, membrane separation device etc.).
The same day, hair oil was complete, when needing defrosting, and valve open, air-introduced machine is introduced air and (is directly introduced the oil-gas heating defrosting if do not introduce air, namely dangerous, can make again oil gas just enter next step oil gas operation without K cryogenic treatment, greatly increase next step burden.Add the absorption gas recovery system for oil such as typical condensation, if the oil gas without K cryogenic treatment directly enters adsorption system, adsorption tanks are steep temperature rise probably, bring very large danger to system, the oil gas of discharging does not probably reach the NMHC content 25g/m3 of national standard with interior regulation simultaneously), the simultaneously contrary circulation of one-level refrigeration system, (one-level refrigeration system, the single level system of Reversible Cycle) its kind of refrigeration cycle flow process is as follows:
The contrary circulation time of refrigeration system, the former first-stage condenser that is used as the evaporimeter of one-level refrigeration system, present condenser as the one-level refrigeration system, cold-producing medium is in this condensation heat release, the air that air-introduced machine is discharged is heated to 20 ℃～60 ℃ at this, heated air enters the secondary condenser that freezes, and secondary condenser is heated the rear discharge of defrosting.Heated air constantly by secondary condenser, constantly rises the B-grade condensation actuator temperature that freezes in first-stage condenser, and the B-grade condensation actuator temperature is risen to more than 0 ℃, is reached for the purpose of secondary condenser defrosting.
Above-mentioned defrosting technique is few to hair oil, the oil depot that the oil gas flow is little, the unlikely obstruction of freezing of secondary condenser, when oil delivery is finished the needs defrosting, heated air can easily pass through secondary condenser in the first-stage condenser, secondary condenser is heated up, but if the oil delivery amount is larger, oil-gas recovery device must be worked the long period, so probably cause secondary condenser to stop up, hot-air during defrosting is blocked at the icing place of secondary condenser, and hot-air is difficult to enter, and secondary condenser all can not defrost for a long time, and have to increase auxiliary electric heater to the secondary condenser defrost, bring potential safety hazard and the waste that causes energy.
3, one-level refrigeration system, the defrosting of two-stage system cooling system impulse electromagnetic valve:
Refrigeration system pulse defrosting, when referring to after oil gas first-stage condenser, oil gas secondary condenser freeze, need to defrost, refrigeration system compressor is operation as usual, open simultaneously the defrosting magnetic valve, close the cold liquid way solenoid valve of three tier structure, make and just pour rapidly oil gas one-level (or secondary) condenser from compressor hot gas out, reach the purpose of defrosting.The pulse defrosting can make compressor load increase, and may directly absorb from the refrigerant liquid of the direct condensation of evaporimeter during compressor air suction, causes the liquid hammer of compressor; Perhaps have little time to carry out the heat exchange heat exchange with the oil-gas condenser that freezes from oil-gas condenser hot gas out; the hot gas of high temperature directly sucks compressor; cause the suction temperature of compressor too high; cause the load of compressor to increase; compressor do not work in this case a few minutes thermal overload relay or other protectors will move; so usually only can allow compressor under this kind bad working environments, work 1～3 minute; then must suspend 3～5 minutes allows compressor " rest " for a moment; could continue again to start hot defrosting; the oil gas secondary condenser is finished from the frozen state to the defrost, and having a rest so in a state of excitement needs to continue 1～2 hour.
Compared with using four-way change-over valve in one-level, the pulse defrost system only need increase a defrosting magnetic valve, cost is saved a little, but defrosting time is long, and very large to compressor injury, probably bring the difficult problems such as compressor liquid hammer, overload or compressor oil return difficulty, so general is used in the lower microminiature refrigeration system of the shared fund of compressor, when the compressor lost of life or liquid hammer damage, only need to buy again a compressor and get final product.But be not suitable for as oil gas reclaims compressor cost moving then several ten thousand in addition the larger refrigeration system of hundreds of thousands on.
The utility model content
The purpose of this utility model is in order to solve the defective of prior art in oil gas recovery refrigeration system is used, to provide a kind of staged refrigeration system of oil gas recovery to solve the problems referred to above.
To achieve these goals, the technical solution of the utility model is as follows:
The staged refrigeration system that a kind of oil gas reclaims, comprise one-level refrigeration system, two-stage system cooling system and three tier structure cooling system, described one-level refrigeration system connects described two-stage system cooling system, and described two-stage system cooling system connects described three tier structure cooling system, it is characterized in that:
Described one-level refrigeration system comprises a stage compressor, the force one wind condenser, one nuclear one-stage throttling device and one-level evaporimeter, a described nuclear one-stage throttling device comprises that one-level refrigeration throttling device and one-level cross cold throttling arrangement, described one-level evaporimeter comprises the first evaporimeter and the second evaporimeter, described the first evaporimeter connects the force one wind condenser by the one-level refrigeration throttling device, described the second evaporimeter is in parallel with the first evaporimeter, and by one-level defrosting magnetic valve connection force one wind condenser, described one-level is crossed cold throttling arrangement and is connected between force one wind condenser and the second evaporimeter, described the second evaporimeter connects four-way change-over valve by one-level refrigeration magnetic valve, and described four-way change-over valve connects a stage compressor;
Described two-stage system cooling system comprises split-compressor, the secondary wind cool condenser, two-step throttle device and secondary evaporimeter, described two-step throttle device comprises secondary refrigeration throttling device and dual evaporation throttling arrangement, described secondary evaporimeter comprises the 3rd evaporimeter and the 4th evaporimeter, described the 3rd evaporimeter connects the second evaporimeter by the secondary refrigeration throttling device, described the second evaporimeter connects the secondary wind cool condenser, described the 4th evaporimeter is in parallel with the 3rd evaporimeter, and connect the second evaporimeter by secondary defrosting magnetic valve, described dual evaporation throttling arrangement is connected between the second evaporimeter and the 4th evaporimeter, described the 4th evaporimeter connects four-way change-over valve by secondary refrigeration magnetic valve, and described four-way change-over valve connects split-compressor;
Described three tier structure cooling system comprises three-stage blower, the force 3 wind condenser, three nuclear one-stage throttling devices and three grades of evaporimeters, described three nuclear one-stage throttling devices comprise the cold throttling arrangement of three tier structure and three grades of defrosting throttling arrangements, described three grades of evaporimeters connect the 4th evaporimeter by the cold throttling arrangement of three tier structure, described three grades of evaporimeters connect compressor by three grades of bypass magnetic valves, an end that is connected three grades of oil content magnetic valves between described defrosting magnetic valve and the compressor, the other end of described three grades of oil content magnetic valves connects expansion vessel, described expansion vessel connects three grades of oil-gas condensers by the expansion vessel magnetic valve, described three grades of defrosting throttling arrangements are arranged between three grades of oil-gas condensers and the expansion vessel, and in parallel with the expansion vessel magnetic valve, between described three grades of defrosting throttling arrangements and three grades of oil-gas condensers the cold return-air magnetic valve of three tier structure is set.
The staged refrigeration system that above-mentioned a kind of oil gas reclaims, it is characterized in that: described the first evaporimeter is the primary oil gas condenser, described the second evaporimeter is that one-level is crossed cold heat exchanger.
The staged refrigeration system that above-mentioned a kind of oil gas reclaims, it is characterized in that: described the 3rd evaporimeter is the secondary oil-gas condenser, described the 4th evaporimeter is the dual evaporation condenser.
The staged refrigeration system that above-mentioned a kind of oil gas reclaims, it is characterized in that: described three grades of evaporimeters are three grades of oil-gas condensers.
The staged refrigeration system that above-mentioned a kind of oil gas reclaims, it is characterized in that: the described staged refrigeration system that reclaims for oil gas also comprises separation and memory device, and described separation and memory device connect primary oil gas condenser, secondary oil-gas condenser and three grades of oil-gas condensers simultaneously.
The staged refrigeration system that above-mentioned a kind of oil gas reclaims, it is characterized in that: described refrigeration system comprises that also air-introduced machine, forecooler, described air-introduced machine connect described forecooler, and described forecooler connects described one-level refrigeration system.
The beneficial effect that the utlity model has:
1, the utility model has adopted the direct phase transformation defrosting of the cold-producing medium that is in vapours (hot fluorine defrosting), and Energy Efficiency Ratio is high.
2, because hot fluorine defrosting is directly to carry out in the inside of heat exchanger, so it is fast to conduct heat, defrosting is rapid, and general one-level, secondary oil-gas condenser defrosting time can be finished in 15 minutes, and the defrosting of three grades of oil-gas condensers also can be finished in 30 minutes.Greatly saved defrosting time.
3, hot fluorine defrosting, the temperature of cold-producing medium are from the heat of compression of compressor, and its maximum temperature is by natural being controlled in 130 ℃, than electric heated defrosting safety.
4, hot fluorine defrosting need not additionally be introduced air, can carry out when hair oil amount less, has realized the continuous operation of oil-gas recovery device.
5, because hot fluorine defrosting is to carry out in the refrigeration side of heat exchanger, real even the gas channel of oil-gas condenser has been frozen, also can to defrosting.
6 ,-15 ℃～-30 ℃ oil-gas condensers between former 3 ℃～5 ℃ oil-gas condensers and-40 ℃～-60 ℃ oil-gas condensers of setting up, greatly increased systematic energy efficiency ratio, the low temperature level of former binary folding type cooling system (third level refrigeration system of the present utility model) can be dwindled greatly.
7, the hot fluorine defrosting of the R23 level of the utility model third level, only needing increases by two magnetic valves, increases some expansion vessels, has just solved the difficult problem of low temperature level defrosting in the traditional handicraft, has guaranteed the service life of compressor.
8, owing to adopted hot fluorine defrosting, and oil-gas condensers at different levels all can independently defrost independently, so oil-gas recovery device continuously-running, unlikely as traditional handicraft, even oil truck is arranged in entrucking, if just in time run into oil-gas recovery device in defrosting, the oil gas that produces in the time of also can only be entrucking all directly is discharged into atmosphere.The oil-gas recovery device of the utility model for moving continuously, more energy-conservation, more environmental protection.
9, during underload, the one-level refrigeration system passes to next stage to cold automatically, reduce the final temperature of oil-gas recovery device oil gas recycling, make that to enter the gas concentration that follow-up adsorption treatment or film process lower, objectively prolonged the life-span of activated carbon in the adsorption treatment or the film film in processing.
Effective control when 10, having realized the underrun of one-level refrigeration system, avoided the one-level condensation temperature than great fluctuation process, avoided the frequent start-stop of one-level refrigeration compressor.
Description of drawings
Fig. 1 is one-level refrigeration system schematic diagram of the present utility model
Fig. 2 is secondary of the present utility model and three tier structure cooling system schematic diagram
Fig. 3 is refrigeration modes flow chart of the present utility model
Fig. 4 is Defrost method flow chart of the present utility model
The specific embodiment
Further understand and understanding for making architectural feature of the present utility model and the effect reached had, cooperate detailed explanation in order to preferred embodiment and accompanying drawing, be described as follows:
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the staged refrigeration system that a kind of oil gas reclaims comprises air-introduced machine, forecooler, one-level refrigeration system, two-stage system cooling system and three tier structure cooling system, and air-introduced machine connects described forecooler.
Forecooler connects described one-level refrigeration system, and the one-level refrigeration system connects the two-stage system cooling system, and the two-stage system cooling system connects the three tier structure cooling system.
For becoming liquid one-level refrigeration system smoothly, the gaseous state oil that makes collection comprises a stage compressor 1, force one wind condenser 2, one nuclear one-stage throttling device and one-level evaporimeter, one nuclear one-stage throttling device comprises that one-level refrigeration throttling device 4 and one-level cross cold throttling arrangement 7, and the one-level evaporimeter comprises the first evaporimeter 5 and the second evaporimeter 8, the first evaporimeter 5 connects the force one wind condenser by one-level refrigeration throttling device 4, the second evaporimeter 8 is in parallel with the first evaporimeter 5, and by one-level defrosting magnetic valve 3 connection force one wind condensers 2, one-level is crossed cold throttling arrangement 4 and is connected between force one wind condenser 2 and the second evaporimeter 8, the second evaporimeter 8 connects four-way change-over valve by one-level refrigeration magnetic valve 6, and four-way change-over valve connects a stage compressor 1.For effective refrigeration, the first evaporimeter 5 is primary oil gas condensers, and the second evaporimeter 8 is that one-level is crossed cold heat exchanger.
And the residual a part of gaseous state oil of meeting after the first-stage condenser condensation, this just needs further condensation, secondary condenser is set for this reason, the two-stage system cooling system comprises split-compressor 10, secondary wind cool condenser 9, two-step throttle device and secondary evaporimeter, the two-step throttle device comprises secondary refrigeration throttling device 13 and dual evaporation throttling arrangement 17, secondary evaporimeter comprises the 3rd evaporimeter 14 and the 4th evaporimeter 16, the 3rd evaporimeter 14 connects the second evaporimeter 8 by secondary refrigeration throttling device 13, the second evaporimeter 8 connects secondary wind cool condenser 9, the 4th evaporimeter 16 is in parallel with the 3rd evaporimeter 14, and by secondary defrosting magnetic valve 12 connections the second evaporimeter 8, dual evaporation throttling arrangement 17 is connected between the second evaporimeter 8 and the 4th evaporimeter 16, the 4th evaporimeter 16 connects four-way change-over valve by secondary refrigeration magnetic valve 15, and four-way change-over valve connects split-compressor 10.In order to increase efficient, the 3rd evaporimeter 14 is secondary oil-gas condensers, and the 4th evaporimeter 16 is dual evaporation condensers.
The three tier structure cooling system comprises three-stage blower 21, force 3 wind condenser 20, three nuclear one-stage throttling devices and three grades of evaporimeters 11, three nuclear one-stage throttling devices comprise the cold throttling arrangement 19 of three tier structure and three grades of defrosting throttling arrangements 26, three grades of evaporimeters 11 connect the 4th evaporimeter 16 by the cold throttling arrangement 19 of three tier structure, three grades of evaporimeters 11 connect compressor by three grades of bypass magnetic valves 23, an end that is connected three grades of oil content magnetic valves between defrosting magnetic valve and the compressor, the other end of three grades of oil content magnetic valves connects expansion vessel 25, expansion vessel 25 connects three grades of oil-gas condensers by three grades of expansion vessel magnetic valves 27, three grades of defrosting throttling arrangements 26 are arranged between three grades of oil-gas condensers and the expansion vessel, and in parallel with three grades of expansion vessel magnetic valves 27, between three grades of defrosting throttling arrangements 26 and three grades of oil-gas condensers 11 the cold return-air magnetic valve 22 of three tier structure is set.
Except refrigeration also need store condensed fluid oil, therefore, the staged refrigeration system that is used for the oil gas recovery also comprises separates and memory device, and separation and memory device connect respectively primary oil gas condenser, secondary oil-gas condenser and three grades of oil-gas condensers.
Referring to Fig. 3 in order to freeze, when elder generation is loading and unloading gasoline in this cover system, the defeated oil gas of collection is introduced device for recovering oil and gas to oil gas by air-introduced machine, oil gas carries out heat exchange with secondary condenser low temperature exhaust gas out in preposition forecooler, make the oil gas temperature drop to 10 ℃～20 ℃, and then enter first-stage condenser and continue cooling, make the oil gas temperature be down to 3 ℃～5 ℃, become liquid oil gas and flow into knockout drum, the oil gas after the first-stage condenser cooling of passing through of gaseous state enters secondary condenser again and further lowers the temperature, make the oil gas temperature be down to-15 ℃～-30 ℃, become liquid oil gas and flow into knockout drum, then gaseous state at secondary condenser further after the cooling, change three grades of condensers over to, temperature is dropped to-40 ℃～-60 ℃ by three grades of condensers, most of oil gas is condensed into liquid and enters the temporary knockout drum of oil product at this, the tail gas of low temperature enters preposition forecooler after converging with the gas that volatilizes from the temporary knockout drum of oil product, carries out emptying after the heat exchange with the oil gas of discharging from air-introduced machine or enters subsequent treatment (charcoal absorption, membrane separation device etc.).
And need the one-level refrigeration system to take away heat in the first-stage condenser, the high-temperature high-pressure refrigerant of discharging after the compressed machine compression, behind the mist attitude oil droplet through carrying secretly in the oil eliminator removal cold-producing medium, enter the A mouth of four-way change-over valve, enter force one wind condenser 2 from the outflow of B mouth, cold-producing medium is condensed to environment temperature, becomes high temperature high pressure liquid, enters reservoir, from reservoir liquid refrigerant out, through check-valves, be divided into two-way: the one tunnel through filter, ball valve, magnetic valve, enter one-level refrigeration throttling device 4, this one-level refrigeration throttling device 4 is expansion valve or capillary, and expenditure and pressure enters primary oil gas condenser 5 for liquid low-temperature refrigerant, carry out heat exchange with oil gas, make oil gas be cooled to 3 ℃～5 ℃, simultaneously cold-producing medium heat absorption is evaporated to gas, then gets back to the D mouth of four-way change-over valve; Another road is from check-valves cold-producing medium out, through filter, ball valve, magnetic valve, enter one-level and cross cold throttling arrangement 4, this throttling arrangement also is expansion valve or capillary, expenditure and pressure, become cryogenic liquid, enter the cold-producing medium that one-level crosses in 8 pairs of two-stage system cooling systems of cold heat exchanger and carried out cold heat exchange.Then through one-level refrigeration magnetic valve 6, enter the D mouth of four-way change-over valve (one-level four-way change-over valve) after converging with primary oil gas condenser 5 cold-producing medium out.Enter gas-liquid separator through the C mouth of four-way change-over valve (one-level four-way change-over valve) after out, then pass through filter, return the compressor air suction mouth.
And for the refrigeration of replenishing the one-level refrigeration system insufficient, the work of two-stage system cooling system is arranged simultaneously, the high-temperature high-pressure refrigerant of discharging after the compressed machine compression, behind the mist attitude oil droplet through carrying secretly in the oil eliminator removal cold-producing medium, enter the A mouth of four-way change-over valve (secondary four-way change-over valve), enter secondary wind cool condenser 9 from the outflow of B mouth, cold-producing medium is condensed to environment temperature, become high temperature high pressure liquid, enter one-level and cross cold heat exchanger 8, carry out heat exchange with the low-temperature refrigerant of one-level refrigeration system, further cold-producing medium is crossed cold for the cold-producing medium of cryogenic high pressure, enter reservoir, from reservoir liquid refrigerant out, through check-valves, be divided into two-way: the one tunnel through filter, ball valve, magnetic valve, enter secondary refrigeration throttling device 13, this throttling arrangement is expansion valve or capillary, and expenditure and pressure enters secondary oil-gas condenser 14 for liquid low-temperature refrigerant, carry out heat exchange with oil gas, make oil gas be cooled to-15 ℃～-30 ℃, simultaneously cold-producing medium heat absorption is evaporated to gas, then gets back to the D mouth of four-way change-over valve; Another road is from check-valves cold-producing medium out, through filter, ball valve, magnetic valve enters dual evaporation throttling arrangement 17, and this throttling arrangement also is expansion valve or capillary, expenditure and pressure, become cryogenic liquid, enter dual evaporation condenser 16, the cold-producing medium in the two-stage system cooling system was carried out cold heat exchange.Then through secondary refrigeration magnetic valve 15, enter the D mouth of four-way change-over valve (secondary four-way change-over valve) after converging with secondary oil-gas condenser cold-producing medium out.Enter gas-liquid separator through the C mouth of four-way change-over valve (secondary four-way change-over valve) after out, then pass through filter, return the compressor air suction mouth.
Also have the part gaseous state remaining after having passed through one-level, secondary refrigeration, need the three tier structure cooling system this moment.The R23 cold-producing medium of the HTHP after the compression of R23 low temperature stage compressor, through gs-oil separator (when pressure at expulsion is no more than unloading pressure, oil eliminator closed electromagnetic valve between force 3 wind condenser 9 and the expansion vessel 25), enter 20 precoolings of force 3 wind condenser, and then enter dual evaporation condenser 16 (when not defrosting, three grades of bypass magnetic valves 23 between force 3 wind condenser 20 and the three grades of oil-gas condensers 11 cut out), carry out heat exchange with the low-temperature refrigerant of two-stage system cooling system, the R23 cold-producing medium becomes cryogenic high pressure liquid, then enter filter, ball valve, the cold liquid way solenoid valve 18 of three tier structure between three grades of oil-gas condensers and the dual evaporation condenser, then enter the cold throttling arrangement 19 of three tier structure, this throttling arrangement is expansion valve or capillary, the R23 cold-producing medium becomes the liquid of low-temp low-pressure, through ball valve, enter three grades of oil-gas condensers 11, carry out heat exchange with oil gas, make oil gas be cooled to-40 ℃～-60 ℃, three grades of oil-gas condensers 11 that the R23 cold-producing medium becomes that low-pressure steam enters and three grades of oil content magnetic valves 24 between the gs-oil separator (during non-defrost state between expansion vessel and the three grades of oil-gas condensers three grades of expansion vessel magnetic valves 27 close), through gas-liquid separator, filter is got back to the air entry of R23 low temperature stage compressor 21.
The frosting situation appears in cold and hot exchange easily when reclaiming referring to Fig. 4 oil gas, be unfavorable for that oil gas reclaims, and refrigeration system itself also can provide the effect of defrosting, when oil gas process primary oil gas condenser 5, in the one-level refrigeration system, need ownership cryogen to flow into one-level and cross cold heat exchanger 8, full load is that the two-stage system cooling system is excessively cold.The high-temperature high-pressure refrigerant of therefore at first after the compression of high temperature stage compressor, discharging, behind the mist attitude oil droplet through carrying secretly in the oil eliminator removal cold-producing medium, enter the A mouth of four-way change-over valve (one-level four-way change-over valve), then flow out through the D mouth, the one-level refrigeration magnetic valve 6 that one-level is crossed between cold heat exchanger and the D mouth cuts out, high-temperature high-pressure refrigerant directly enters primary oil gas condenser 5, primary oil gas condenser 5 heat exchange with low temperature, be reached for the purpose of primary oil gas condenser defrosting, this moment, the part cold-producing medium may be condensed into liquid, pass through afterwards check-valves, ball valve, dual flow filter, filter, ball valve, magnetic valve, cross cold throttling arrangement 7 (one-level is crossed capillary or the expansion valve between cold heat exchanger and the filter) through one-level, be the cold-producing medium throttling low-temp low-pressure liquid, cross cold heat exchanger 8 through one-level, after the cold-producing medium heat exchange of level two, enter the one-level defrosting magnetic valve 3 between primary oil gas condenser 5 and the reservoir, behind check-valves, enter two-way reservoir, then enter force one wind condenser 2, through the B mouth of four-way change-over valve (one-level four-way change-over valve), from the C mouth of four-way change-over valve (one-level four-way change-over valve) out, then through gas-liquid separator, continue compressed through getting back to compressor behind the filter.
Therefore the two-stage system cooling system also also frost can occur in work, therefore the two-stage system cooling system also will defrost, when oil gas process secondary oil-gas condenser 14, one-level is crossed the closed electromagnetic valve between cold throttling arrangement and the filter in this moment one-level refrigeration system, the one-level refrigeration system is excessively not cold to the two-stage system cooling system, the high-temperature high-pressure refrigerant of then after the compression of high temperature stage compressor, discharging, behind the mist attitude oil droplet through carrying secretly in the oil eliminator removal cold-producing medium, enter the A mouth of four-way change-over valve (secondary four-way change-over valve), then flow out through the D mouth, secondary refrigeration magnetic valve 15 between D mouth and the dual evaporation condenser 16 cuts out, high-temperature high-pressure refrigerant directly enters secondary oil-gas condenser 14, secondary oil-gas condenser heat exchange with low temperature, be reached for the purpose of secondary oil-gas condenser defrosting, this moment, the part cold-producing medium may be condensed into liquid, pass through afterwards check-valves, ball valve, dual flow filter, filter, ball valve, magnetic valve, through dual evaporation throttling arrangement 17 (capillary or expansion valve between filter and the dual evaporation condenser 16), be the cold-producing medium throttling low-temp low-pressure liquid, through dual evaporation condenser 16, after the R23 refrigeration system heat exchange of three-level system, enter the secondary defrosting magnetic valve 12 between dual evaporation condenser 16 and the reservoir, behind check-valves, enter two-way reservoir, then enter one-level and cross cold heat exchanger 8,9 places are heated by environment division at the secondary wind cool condenser, and refrigerant temperature is returned to more than-20 ℃, B mouth through four-way change-over valve (secondary four-way change-over valve), from the C mouth of four-way change-over valve (secondary four-way change-over valve) out, then through gas-liquid separator, continue compressed through getting back to compressor 10 behind the filter.
Last three tier structure cooling system also frost can occur at work, therefore the three tier structure cooling system also will defrost, when oil gas during through three grades of condensers, closed electromagnetic valve in this moment two-stage system cooling system between dual evaporation throttling arrangement 17 and the filter, the two-stage system cooling system is excessively not cold to the dual evaporation condenser, then the R23 cold-producing medium of the HTHP after R23 low temperature stage compressor compression, through oil eliminator (when pressure at expulsion is no more than unloading pressure, three grades of oil content magnetic valves 24 between expansion vessel 25 and the force 3 wind condenser 20 cut out), three grades of bypass magnetic valves 23 that are connected with force 3 wind condenser 20 are opened (the cold liquid way solenoid valve 18 of three tier structure is closed), vapours directly enters three grades of oil-gas condensers 11, three grades of oil-gas condenser 11 heat exchange with low temperature, three grades of oil-gas condenser 11 temperature rise to more than 0 ℃ and defrost, from out high-pressure refrigerant of three grades of oil-gas condensers 11 (the cold return-air magnetic valve 22 of three tier structure between oil-liquid separator and the three grades of oil-gas condensers 11 cuts out), enter the expansion vessel that strengthens design by the expansion vessel magnetic valve 27 between three grades of oil-gas condensers 11 and the expansion vessel 25, again after three grades of defrosting throttling arrangements 26 (capillary or expansion valve between oil-liquid separator and the expansion vessel 25) step-down, enter gas-liquid separator, through being sucked and again compression by compressor 21 behind the filter.
When R23 three tier structure cooling system pressure at expulsion surpassed unloading pressure: pressure at expulsion was too high; the action of R23 level high voltage protector; three grades of oil content magnetic valves 24 between expansion vessel 25 and the force 3 wind condenser 20 are opened; high-pressure refrigerant is pressed into the expansion vessel 25 of low pressure; when pressure at expulsion drops to certain value; three grades of oil content magnetic valves 24 between expansion vessel 25 and the force 3 wind condenser 20 cut out, and cold-producing medium is according to normal path flows.When surpassing unloading pressure, system breaks down in the time of can not normally opening three grades of oil content magnetic valves 24 that unload between expansion vessel 25 and the force 3 wind condenser 20, and the another high voltage protector action in the high-low pressure protector makes system-down.
During system-down, three grades of oil content magnetic valves 24 between expansion vessel 25 and the force 3 wind condenser 20 are opened, and it is temporary that the R23 cold-producing medium enters expansion vessel 25, reduces system-down pressure.
In sum, it only is preferred embodiment of the present utility model, be not to limit the scope that the utility model is implemented, all equalizations of doing according to the described shape of the utility model claim scope, structure, feature and spirit change and modify, and all should be included in the claim scope of the present utility model.
Claims (6)
1. the staged refrigeration system that reclaims of an oil gas, comprise one-level refrigeration system, two-stage system cooling system and three tier structure cooling system, described one-level refrigeration system connects described two-stage system cooling system, and described two-stage system cooling system connects described three tier structure cooling system, it is characterized in that:
Described one-level refrigeration system comprises a stage compressor, the force one wind condenser, one nuclear one-stage throttling device and one-level evaporimeter, a described nuclear one-stage throttling device comprises that one-level refrigeration throttling device and one-level cross cold throttling arrangement, described one-level evaporimeter comprises the first evaporimeter and the second evaporimeter, described the first evaporimeter connects the force one wind condenser by the one-level refrigeration throttling device, described the second evaporimeter is in parallel with the first evaporimeter, and by one-level defrosting magnetic valve connection force one wind condenser, described one-level is crossed cold throttling arrangement and is connected between force one wind condenser and the second evaporimeter, described the second evaporimeter connects four-way change-over valve by one-level refrigeration magnetic valve, and described four-way change-over valve connects a stage compressor;
Described two-stage system cooling system comprises split-compressor, the secondary wind cool condenser, two-step throttle device and secondary evaporimeter, described two-step throttle device comprises secondary refrigeration throttling device and dual evaporation throttling arrangement, described secondary evaporimeter comprises the 3rd evaporimeter and the 4th evaporimeter, described the 3rd evaporimeter connects the second evaporimeter by the secondary refrigeration throttling device, described the second evaporimeter connects the secondary wind cool condenser, described the 4th evaporimeter is in parallel with the 3rd evaporimeter, and connect the second evaporimeter by secondary defrosting magnetic valve, described dual evaporation throttling arrangement is connected between the second evaporimeter and the 4th evaporimeter, described the 4th evaporimeter connects four-way change-over valve by secondary refrigeration magnetic valve, and described four-way change-over valve connects split-compressor;
Described three tier structure cooling system comprises three-stage blower, the force 3 wind condenser, three nuclear one-stage throttling devices and three grades of evaporimeters, described three nuclear one-stage throttling devices comprise the cold throttling arrangement of three tier structure and three grades of defrosting throttling arrangements, described three grades of evaporimeters connect the 4th evaporimeter by the cold throttling arrangement of three tier structure, described three grades of evaporimeters connect compressor by three grades of bypass magnetic valves, an end that is connected three grades of oil content magnetic valves between described defrosting magnetic valve and the compressor, the other end of described three grades of oil content magnetic valves connects expansion vessel, described expansion vessel connects three grades of oil-gas condensers by the expansion vessel magnetic valve, described three grades of defrosting throttling arrangements are arranged between three grades of oil-gas condensers and the expansion vessel, and in parallel with the expansion vessel magnetic valve, between described three grades of defrosting throttling arrangements and three grades of oil-gas condensers the cold return-air magnetic valve of three tier structure is set.
2. the staged refrigeration system that reclaims of described a kind of oil gas according to claim 1, it is characterized in that: described the first evaporimeter is the primary oil gas condenser, described the second evaporimeter is that one-level is crossed cold heat exchanger.
3. the staged refrigeration system that reclaims of described a kind of oil gas according to claim 1, it is characterized in that: described the 3rd evaporimeter is the secondary oil-gas condenser, described the 4th evaporimeter is the dual evaporation condenser.
4. the staged refrigeration system that reclaims of described a kind of oil gas according to claim 1, it is characterized in that: described three grades of evaporimeters are three grades of oil-gas condensers.
5. the staged refrigeration system that reclaims of described a kind of oil gas according to claim 4, it is characterized in that: the described staged refrigeration system that reclaims for oil gas also comprises separation and memory device, and described separation and memory device connect primary oil gas condenser, secondary oil-gas condenser and three grades of oil-gas condensers simultaneously.
6. the staged refrigeration system that reclaims of described a kind of oil gas according to claim 1, it is characterized in that: described refrigeration system comprises that also air-introduced machine, forecooler, described air-introduced machine connect described forecooler, and described forecooler connects described one-level refrigeration system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220260295 CN202835898U (en) | 2012-06-04 | 2012-06-04 | Cascade type refrigeration system for oil and gas recovery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220260295 CN202835898U (en) | 2012-06-04 | 2012-06-04 | Cascade type refrigeration system for oil and gas recovery |
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| CN202835898U true CN202835898U (en) | 2013-03-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706024A (en) * | 2012-06-04 | 2012-10-03 | 上海森鑫新能源科技有限公司 | Stepped refrigerating system and method for recovering oil gas and defrosting method |
| CN105771300A (en) * | 2015-12-01 | 2016-07-20 | 北京明天和创科贸有限公司 | Oil and gas recovery system |
| CN108603711A (en) * | 2016-01-08 | 2018-09-28 | 株式会社电装 | Conveying refrigerating plant |
| CN114699789A (en) * | 2022-03-16 | 2022-07-05 | 南京都乐制冷设备有限公司 | Oil tanker wharf oil gas recovery device |
| CN115518407A (en) * | 2022-09-16 | 2022-12-27 | 上海昱菱制冷科技有限公司 | Ultralow-temperature solvent condensation recovery system and method |
-
2012
- 2012-06-04 CN CN 201220260295 patent/CN202835898U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706024A (en) * | 2012-06-04 | 2012-10-03 | 上海森鑫新能源科技有限公司 | Stepped refrigerating system and method for recovering oil gas and defrosting method |
| CN102706024B (en) * | 2012-06-04 | 2015-06-17 | 上海森鑫新能源科技有限公司 | Stepped refrigerating system and method for recovering oil gas and defrosting method |
| CN105771300A (en) * | 2015-12-01 | 2016-07-20 | 北京明天和创科贸有限公司 | Oil and gas recovery system |
| CN108603711A (en) * | 2016-01-08 | 2018-09-28 | 株式会社电装 | Conveying refrigerating plant |
| CN114699789A (en) * | 2022-03-16 | 2022-07-05 | 南京都乐制冷设备有限公司 | Oil tanker wharf oil gas recovery device |
| CN114699789B (en) * | 2022-03-16 | 2023-05-09 | 南京都乐制冷设备有限公司 | Oil-gas recovery device for oil tanker wharf |
| CN115518407A (en) * | 2022-09-16 | 2022-12-27 | 上海昱菱制冷科技有限公司 | Ultralow-temperature solvent condensation recovery system and method |
| CN115518407B (en) * | 2022-09-16 | 2024-05-07 | 上海昱菱制冷科技有限公司 | Ultralow-temperature solvent condensation recovery system and method |
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