CN202221213U - Propane boil off gas and butane boil off gas liquefying system - Google Patents
Propane boil off gas and butane boil off gas liquefying system Download PDFInfo
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- CN202221213U CN202221213U CN 201120271258 CN201120271258U CN202221213U CN 202221213 U CN202221213 U CN 202221213U CN 201120271258 CN201120271258 CN 201120271258 CN 201120271258 U CN201120271258 U CN 201120271258U CN 202221213 U CN202221213 U CN 202221213U
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Abstract
The utility model relates to a propane boil off gas and butane boil off gas liquefying system, which comprises a gas-liquid separation tank, a propane boil off gas (BOG) output pipe for delivering propane BOG to the gas-liquid separation tank, a compressor for compressing propane BOG, a propane liquefier for liquefying high pressure propane BOG, a propane buffer tank for temporality storing high pressure liquid propane, a propane collecting tank for collecting high pressure liquid propane in the propane buffer tank, a propane spherical tank for storing low pressure liquid propane, a propane delivery pipe communicated with the propane collecting tank and the propane spherical tank, a propane regulating valve arranged on the propane delivery pipe, a butane condenser for liquefying butane BOG to liquid butane, a butane liquefied cold delivery pipe for supplying liquid propane to the butane condenser to serve as liquefied cold, a depressurization throttling valve arranged on the butane liquefied cold delivery pipe, a butane buffer tank for temporality storing liquid butane and a butane return pump for delivering ordinary pressure liquid butane to a butane storage tank. The propane boil off gas and butane boil off gas liquefying system can improve liquefied and output comprehensive energy use ratio.
Description
Technical field
The utility model relates to the storage and the transportation art of low-temperature liquefaction oil gas, particularly relates to the liquefaction system of a kind of propane boil-off gas and butane boil-off gas.
Background technology
Liquefied petroleum gas (Liquefied Petroleum Gas is called for short LPG) is the mixture of propane and butane.Propane is a kind of alkane of three carbon, is generally gaseous state.Butane is two kinds of general designations that the alkane hydrocarbon of same molecular formula (C4H10) is arranged, and comprises normal butane and iso-butane.
Propane and butane generally be with low temperature pressure-fired liquid phase storing in storage tank separately; Because the propane of low temperature liquid phase and the butane heat in all can absorbing environmental, thereby the above part of liquid level is the gas-phase space that the boil-off gas (BOG) by low temperature propane or butane is constituted in the storage tank.Along with increasing of BOG, the air pressure in the storage tank also increases gradually, if do not carry out any processing, storage tank will be excessive and impaired because of air pressure inside.Therefore; Must to low temperature propane tank and low temperature butane storage tank separately the BOG in the gas-phase space liquefy; Make the air pressure of storage tank gas-phase space remain the slight positive pressure state that is slightly larger than external atmospheric pressure; Make full use of the BOG resource simultaneously, prevent its exhaust emission environment and cause accidents such as fire, blast.
Utilizing prior art that propane BOG and butane BOG are liquefied, is to overlap independently liquefaction system for propane and butane are provided with one separately, and every cover liquefaction system is formed by compressor, liquefier (like aerial cooler, water cooler etc.).The operation principle of this system is: utilize compressor with the normal pressure BOG boil down to high pressure BOG in the gas-phase space, utilize liquefier that it is liquefied then, carry back storage tank separately after high-pressure liquid propane that liquefaction is obtained and high-pressure liquid butane are reduced to normal pressure.
Low temperature liquid propane in the storage tank and liquefied butane finally all will be input into row utilization outward.Need heat before low temperature propane is defeated outside, this is the same with liquefaction, also need consume certain energy.And the temperature of liquefied butane and environment temperature are more or less the same, and do not need heating before outer the failing.This shows; Because existing technology is to adopt two independently systems to the liquefaction of propane BOG and butane BOG;, the higher propane BOG of temperature and butane BOG need consume certain energy when being liquefied; And when defeated outside, also need the lower LPG of temperature be heated, also consume certain energy.Therefore, existing liquefaction technology causes liquefaction lower with outer defeated complex energy utilization rate.
Summary of the invention
The utility model technical problem to be solved provides the liquefaction system of a kind of propane boil-off gas and butane boil-off gas, can improve liquefaction and outer defeated complex energy utilization rate.
The technical scheme that the utility model solves the problems of the technologies described above is following: the liquefaction system of a kind of propane boil-off gas BOG and butane BOG is used for the butane BOG of normal pressure in the propane BOG of propane tank normal pressure and the butane storage tank is liquefied; It is characterized in that this system comprises: the propane knockout drum; The propane BOG efferent duct that two ends communicate with the gas-phase space and the said propane knockout drum of said propane tank respectively; The compressor of the propane BOG boil down to high pressure propane BOG of the normal pressure that said propane knockout drum is sent here; The high pressure propane BOG liquefaction that said compressor is sent here is the propane liquefier of high-pressure liquid propane; The propane surge tank that the said high-pressure liquid propane that said propane liquefier is sent here is kept in; Link to each other to collect the propane collecting tank of high-pressure liquid propane wherein with said propane surge tank; Store the propane spherical tank of low-pressure liquid propane; The delivery of propane pipe that two ends communicate with said propane collecting tank and said propane spherical tank respectively; Be positioned at the propane control valve on the said delivery of propane pipe; The butane BOG liquefaction of normal pressure is the butane condenser of normal pressure liquefied butane; The butane BOG efferent duct that two ends link to each other with said butane condenser with the gaseous space of said butane storage tank respectively; Two ends link to each other with the liquid phase space of said propane spherical tank and the cold input of said butane condenser respectively, the low-pressure liquid propane in the said propane spherical tank is reduced to normal pressure be transported to said butane condenser so that the butane liquefaction cold carrier pipe of liquefaction institute chilling requirement to be provided to it; Be positioned at the step-down choke valve on the said butane liquefaction cold carrier pipe; The butane surge tank of the said normal pressure liquefied butane that temporary said butane condenser is sent here; Said normal pressure liquefied butane in said butane surge tank provides power to return pump with the butane of it being delivered to said butane storage tank.
The beneficial effect of the utility model is: the utility model only is provided with a cover compressor; It is used to compress the propane BOG of normal pressure, and the high pressure propane BOG that obtains after the compression is by after the propane liquefier liquefaction, and the LPG that obtains is successively through the collection of temporary, the propane collecting tank of propane surge tank; The final propane Spherical tank Storage that gets into; Because the temperature of this LPG has reached outer defeated temperature, thereby the LPG in the propane spherical tank can directly carry out outer defeatedly, need not to heat.In addition, the LPG in the propane spherical tank after reducing to normal pressure, also as butane condenser to the cold source that the butane BOG of normal pressure carries out condensation, be used for realizing liquefaction to the butane BOG of butane storage tank.Therefore, the utility model lacks than prior art has used the compressor apparatus of a cover to butane BOG, except reducing equipment investment, can also reduce the energy consumption of compressor operating aspect; The LPG that is stored in the propane spherical tank can be directly outer defeated, reduced it is heated the energy that is consumed; Sharp by butane BOG is provided after the LPG step-down in the propane spherical tank cold of liquefaction; Can reduce the energy that butane BOG liquefaction is consumed; This shows that the utility model connects the liquefaction of propane BOG and butane BOG, improved liquefaction and outer defeated complex energy utilization rate greatly.
On the basis of technique scheme, the utility model can also be done following improvement:
Further, said propane liquefier is the aerial cooler that utilizes the cold of air that said high pressure propane BOG is cooled off and liquefies;
And/or,
This system also comprises with said propane tank and linking to each other, and provides power with the propane output pump with its output to the LPG of wherein normal pressure; Said propane liquefier is to link to each other with said propane output pump, the propane condenser that said high pressure propane BOG is cooled off and liquefies with the cold of the said LPG that utilizes its output.
Further, said compressor links to each other through high pressure propane BOG carrier pipe with said propane liquefier; This system comprises that also two ends communicate with the gas-phase space and the said high pressure propane BOG carrier pipe of said propane surge tank respectively, so that the high pressure propane BOG that flashes off in the said propane surge tank is delivered to the flash distillation high pressure propane carrier pipe that said propane liquefier liquefies through said high pressure propane BOG carrier pipe.
Further, said compressor comprises the lube oil cooler that the lubricating oil to its inside cools off; This system also comprises: two ends link to each other with the liquid phase space of said propane surge tank and the input of said lube oil cooler respectively, and the high-pressure liquid propane in the said propane surge tank is delivered to said lube oil cooler so that the siphon pipe of cold to be provided to it through siphon mode; Two ends link to each other with the output of said lube oil cooler and the gas-phase space of said propane surge tank respectively, deliver to the cooling recurrent canal of said propane surge tank with the high pressure propane BOG that the said high-pressure liquid propane gasification that loses cold in the said lube oil cooler is formed.
Further, also comprise with the liquid phase space of said propane knockout drum linking to each other, the butane lime set pump of power is provided with the liquefied butane to wherein normal pressure;
Said butane lime set delivery side of pump links to each other with said butane storage tank, the liquefied butane of said normal pressure is delivered to said butane storage tank.
Further, also comprise: the liquid level detector that detects the liquid level of the said high-pressure liquid propane in the said propane collecting tank; Link to each other with said propane control valve with said liquid level detector respectively, control first controller of the aperture of said propane control valve with the said liquid level that records according to said liquid level detector.
Further, also comprise: link to each other with said delivery of propane pipe, provide power to realize the outer defeated propane shipment pump of low-pressure liquid propane to the low-pressure liquid propane of its conveying.
Further; Also comprise: two ends link to each other with said propane BOG efferent duct with the gas-phase space of said propane spherical tank respectively; With the low-pressure propane BOG step-down that flashes off in the said propane spherical tank is normal pressure, and it is transported to the flash distillation low-pressure propane carrier pipe of said propane knockout drum through said propane BOG efferent duct; Be positioned at the flash distillation low-pressure propane pressure-regulating valve on the said flash distillation low-pressure propane carrier pipe.
Further, also comprise: the pressure by air pressure detector that detects the propane BOG that said flash distillation low-pressure propane carrier pipe carried; Link to each other respectively with said flash distillation low-pressure propane pressure-regulating valve with said pressure detector, control second controller of the aperture of said flash distillation low-pressure propane pressure-regulating valve with the air pressure that records according to said pressure detector.
Further; Also comprise: two ends link to each other with said propane BOG efferent duct with the cold output of said butane condenser respectively, are transported to the normal pressure propane BOG carrier pipe of said propane knockout drum through said propane BOG efferent duct with the normal pressure propane BOG that the normal pressure LPG gasification that loses cold in the said butane condenser is formed; Detect the Temperature Detector of the temperature of the said normal pressure propane BOG that said normal pressure propane BOG carrier pipe carried; Link to each other with said step-down choke valve with said Temperature Detector respectively, to control the 3rd controller of the aperture of said step-down choke valve according to the measured temperature of said Temperature Detector.
Description of drawings
The structure chart of propane BOG that Fig. 1 provides for the utility model and the liquefaction system of butane BOG.
The specific embodiment
Below in conjunction with accompanying drawing the principle and the characteristic of the utility model are described, institute gives an actual example and only is used to explain the utility model, is not the scope that is used to limit the utility model.
The utility model provides the liquefaction system of a kind of propane boil-off gas (BOG) and butane BOG, and Fig. 1 is the structure chart of this system.As shown in Figure 1; This system is used for the butane BOG of normal pressure in the propane BOG of propane tank 101 normal pressures and the butane storage tank 128 is liquefied; BOG in these two storage tanks derives from the volatilization behind atmospheric low-temperature liquid hydrocarbon (low temperature liquid propane or liquefied butane) the absorbing environmental heat of its storage; These BOG have all formed a gas-phase space in corresponding storage tank, the normal pressure liquid hydrocarbon then forms the liquid phase space of this storage tank in corresponding storage tank.Gas-phase space in each storage tank is on top; The liquid phase space is positioned at the bottom; Therefore, in the utility model, communicate with the gas-phase space of each storage tank or the pipeline that links to each other all communicates with this gas-phase space or links to each other from this tank top; The pipeline that communicates with the liquid phase space of each storage tank or link to each other can communicate with its liquid phase space or links to each other from corresponding storage tank lower sidewall, thereby realizes and the communicating or link to each other of liquid phase space.Equally; Also all there are gas-phase space and liquid phase space in other can container in the utility model (like propane spherical tank 120, each surge tank, propane knockout drum 102, propane collecting tank 115 etc.) inside; The connected mode coupled or pipeline that communicates adopts gas phase to link to each other from top, and liquid phase links to each other from the bottom.
As shown in Figure 1, this system comprises: to importing the propane knockout drum 102 that its inner atmospheric low-temperature propane (propane BOG and LPG) carries out gas-liquid separation; Two ends communicate with the gas-phase space and the propane knockout drum 102 of propane tank 101 respectively; So that the normal pressure propane BOG in the propane tank 101 is transported to the propane BOG efferent duct 103 in the propane knockout drum 102; Because the material that propane BOG efferent duct 103 is carried is except comprising propane BOG; Also possibly contain a spot of liquid (being generally the higher liquefied butane of phosphorus content); Thereby the utility model is provided with propane knockout drum 102, to realize the separation of gas-liquid, prevents that LPG from impacting back-connected compressor and other pipelines; The compressor 104 of the propane BOG boil down to high pressure propane BOG of the atmospheric low-temperature that propane knockout drum 102 is sent here; The compressor 104 here is a cover compression machine equipment, and it can be with the propane BOG boil down to high pressure propane BOG of normal pressure, and this process is recently carried out in strict accordance with predefined compression; If compression ratio is lower; Then the compressor in the utility model 104 can be realized with a compressor, if compression ratio than higher, then available multiple compressors is realized the compressor 104 among Fig. 1; Thereby prolong the service life of every compressor, reduce system cost.
In addition; Isolated liquid is generally the higher normal pressure liquefied butane of phosphorus content in the propane knockout drum 102, and this is because liquefied petroleum gas is the mixture of LPG and liquefied butane, can't the two be separated up hill and dale; After getting into propane knockout drum 102; The higher liquefied butane of phosphorus content is higher because of saturation temperature, can be pooled to the bottom liquid phases space of propane knockout drum 102 gradually, thereby the propane BOG of itself and normal pressure is separated.Like this; The utility model also is provided with the liquid phase space of propane knockout drum 102 and links to each other; The butane lime set pump 129 of power is provided with the liquefied butane to wherein normal pressure; The output of this butane lime set pump 129 links to each other with butane storage tank 128, so that the liquefied butane of normal pressure is delivered to butane storage tank 128.
This system also comprises: the high pressure propane BOG liquefaction that compressor 104 is sent here is the propane liquefier of high-pressure liquid propane.The implementation of the propane liquefier here is a lot; Prior art utilizes aerial cooler or water cooler to realize; The aerial cooler that propane liquefier in the utility model also can cool off and liquefy high pressure propane BOG for the cold that utilizes air; Shown in the aerial cooler that label among Fig. 1 is 106, this aerial cooler 106 can realize that also available many aerial coolers are realized with an aerial cooler.The propane liquefier can also realize that this propane condenser utilizes the cold of other materials to come high pressure propane BOG is liquefied with the propane condenser, shown in the propane condenser that label among Fig. 1 is 108.In order to realize that the outer of LPG failed in the propane tank 101; This system also comprises with propane tank 101 and linking to each other; LPG to wherein normal pressure provides power with the propane output pump 125 with its output; The normal pressure LPG of its conveying has a large amount of colds, and the utility model outer defeated normal pressure LPG capable of using is as the cold source that high pressure propane BOG is liquefied, and is as shown in Figure 1; Propane condenser 108 (being the propane liquefier) links to each other with propane output pump 125, high pressure propane BOG is cooled off and liquefies with the cold of the operative liquid propane that utilizes its output.Certainly, the propane condenser 108 here can be realized with a propane condenser, realizes for also available many, and it is fixed that the situation such as amount and device backup of looking high pressure propane BOG to be liquefied are come.
Preferable; The utility model can be realized cooling and liquefaction to high pressure propane BOG with aerial cooler and propane condenser simultaneously; As shown in Figure 1; Propane liquefier in the utility model is realized with the parallel system of aerial cooler 106 with propane condenser 108; The two can move simultaneously, also can isolated operation, thereby also be provided with regulating switch valve 107 and 109 respectively separately with on the pipeline that propane surge tank 110 is connected at aerial cooler 106, propane condenser 108; When aerial cooler 106 moves with propane condenser 108, to open respectively and to keep certain aperture, the regulating switch valve 107 and 109 here also can be realized with a switch valve and a control valve respectively.
The utility model is realized propane liquefier that propane BOG is cooled off and liquefies with the aerial cooler that is together in parallel and propane condenser; Can be at the low luck row aerial cooler of temperature in winter; Realize liquefaction to make full use of environmental low temperature to high pressure propane BOG; Reduce the power consumption of liquefaction; Then utilize the propane condenser to realize liquefaction higher summer at temperature, can reduce the number of devices of aerial cooler like this, thereby reduce the floor space of propane liquefier high pressure propane BOG.Thereby the utility model also has the advantage that reduces system energy consumption and system's floor space concurrently.
As shown in Figure 1; This system also comprises: the propane surge tank 110 that the high-pressure liquid propane (the about 1.8MPaG of pressure) that the propane liquefier is sent here is kept in, and link to each other with the propane collecting tank 115 (pressure of inner high-pressure liquid propane or the air pressure of gas-phase space all are about 1.8MPaG) of collecting high-pressure liquid propane wherein with propane surge tank 110.The propane surge tank 110 here can be through to high-pressure liquid propane temporary, realize its gas-liquid separation.This be since the high-pressure liquid propane that propane liquefier liquefaction obtains after getting into downstream line and equipment; Also can evaporate high pressure propane BOG because of the absorbing environmental heat; The utility model is through being provided with propane surge tank 110; Can make these high pressure propane BOG in temporary process, realize separating fully with high-pressure liquid propane; Thereby to propane collecting tank 115, and for evaporating the high pressure propane BOG that, the utility model can be sent it back to propane liquefier and liquefied again with the high-pressure liquid delivery of propane.As shown in Figure 1, compressor 104 links to each other through high pressure propane BOG carrier pipe 111 with propane liquefier (aerial cooler 106 that is together in parallel and propane condenser 108), delivers to the propane liquefier with the high pressure propane BOG that will obtain after will compressing and liquefies; The high pressure propane BOG that then flashes off in the propane surge tank 110 can realize liquefying again through following structure: this system comprises that also two ends communicate with the gas-phase space and the high pressure propane BOG carrier pipe 111 of propane surge tank 110 respectively, so that the high pressure propane BOG that flashes off in the propane surge tank 110 is delivered to the flash distillation high pressure propane carrier pipe 112 that the propane liquefier liquefies through high pressure propane BOG carrier pipe 111.
As shown in Figure 1, this system also comprises: the propane spherical tank 120 that stores low-pressure liquid propane; The delivery of propane pipe 116 that two ends communicate with propane collecting tank 115 and propane spherical tank 120 respectively; Be positioned at the propane control valve 117 on the delivery of propane pipe 116.
The utility model stores the end product of propane BOG liquefaction with propane spherical tank 120, and does not send them back to propane tank 101 storages.This is because the temperature of this compression of process, the resulting LPG of liquefaction process is outer defeated temperature; Temperature than the normal pressure LPG in the propane tank 101 is much higher; Send it back to propane tank 101 stores; Must reduce pressure and come to its cooling the power consumption that has so just improved the utility model.As shown in Figure 1; The utility model utilizes propane spherical tank 120 to come the end product (reaching the LPG of outer defeated temperature) of storing liquefied; When externally the user has the LPG demand; Can be at first with the LPG output that stores in the propane spherical tank 120, thereby reduce the energy consumption that LPG decompression cooling is wherein returned propane tank and heated up when defeated outward, improve the capacity usage ratio of the utility model.If the reserves of LPG are not enough to satisfy user's demand in the propane spherical tank 120; 126 pairs of LPGs from propane tank 101 of the propane butner that links to each other with propane output pump 125 capable of using heat; Thereby obtain meeting the LPG of outer defeated temperature requirement, flow to the user.Certainly, in the utility model, the mode that LPG is flowed to the user can also can be entrucking for bottling, can also be for defeated outward etc. through pipeline.
Propane in the propane collecting tank 115 is high-pressure liquid propane; Because the volume of propane collecting tank 115 is limited; Can only use as the buffering apparatus for temporary storage; Can not store high-pressure liquid propane in a large number, thereby need the high-pressure liquid delivery of propane of its storage be stored to the huge propane spherical tank 120 of volume.The volume of propane spherical tank 120 is to propose the temporal regularity of demand and the statistical law of each demand designs according to the user; In order further to improve the size of storage area; 120, one of two propane spherical tanks can also be set as main usefulness, one as subsequent use.Like this, propane spherical tank 120 just can realize storing discontinuous outer defeated LPG, with the waste avoiding directly discharging propane and caused and the function of environmental pollution.
The utility model is provided with propane control valve 117 on the delivery of propane pipe 116 that connects propane collecting tank 115 and propane spherical tank 120, change through its aperture and can control the flow of LPG from propane collecting tank 115 to propane spherical tank 120.Simultaneously; The propane spherical tank 120 stored pressure of treating the outer LPG of failing change between 0.6MPaG-1.4MPaG; Be the described low-pressure state of the utility model; After opening propane control valve 117, LPG is 116 entering propane spherical tanks 120 from propane collecting tank 115 along the delivery of propane pipe, can also realize the transformation of LPG from high pressure conditions (about 1.8MPaG) to the described low-pressure state of the utility model.
Consider that the user is uncertain to the time that the outer defeated demand of propane proposes, the utility model also is provided with delivery of propane pipe 116 and links to each other, provides power to load and transport pump 127 with the outer defeated propane of realizing low-pressure liquid propane to the low-pressure liquid propane of its conveying.Like this; The pressure of the LPG in propane spherical tank 120 does not satisfy outer when failing the requiring of pressure; Can load and transport pump 127 by propane power is provided; LPG is defeated by the user outward, and the LPG in this moment propane collecting tank 115 also can carry out outer defeated (propane spherical tank 120 also can load and transport pump 127 with propane and be connected through pipeline) by propane transhipment pump 127 with the propane in the propane spherical tank 120, stores and no longer deliver to propane spherical tank 120.
As shown in Figure 1; The utility model can utilize propane output pump 125 pressurization to provide normal pressure LPG behind the power as cold source (it being transported to propane condenser 108 through pipeline 141); Utilize propane condenser 108 to come high pressure propane BOG is cooled off and liquefies; And losing cold after, become the LPG of failing temperature requirement outside meeting as the LPG after the pressurization in cold source; Can be directly outer defeated through the pipeline shown in the dotted line 142 among Fig. 1, or be transported to propane spherical tank 120 and store temporarily, wait for outer defeated.
In the utility model; Propane control valve 117 is the liquid phase control valve; It can not stop passing through of gas; Propane BOG in propane collecting tank 115 gaseous spaces is a high pressure and propane BOG in the propane spherical tank 120 is under the situation of the described low-pressure state of the utility model (air pressure is between the 0.6-1.4MPaG); If the LPG in the propane collecting tank 115 is very few, can cause that high pressure propane BOG wherein directly gets into propane spherical tank 120 along delivery of propane pipe 116, cause propane spherical tank 120 to improve impaired rapidly because of air pressure inside; Perhaps high pressure propane BOG along among Fig. 1 not the dotted line pipeline of label get into propane shipment pump 127, cause the cavitation of propane shipment pump 127 and be destroyed.Therefore; The liquid level of the LPG in the propane collecting tank 115 is remained in the safe range; As shown in Figure 1, this liquefaction system also comprises: the liquid level detector 118 (the height in hand sensor is realized) that detects the liquid level of the high-pressure liquid propane in the propane collecting tank 115; Link to each other with propane control valve 117 with liquid level detector 118 respectively, control first controller 119 of the aperture of propane control valve 117 with the liquid level that records according to liquid level detector 118.Like this; When first controller 119 can arrive minimum critical altitude at the liquid level in the propane collecting tank 115; Control is closed propane control valve 117 or is reduced its aperture, thereby prevents that propane collecting tank 115 inner high voltage propane BOG from directly getting into propane spherical tank 120 along delivery of propane pipe 116; When liquid level in propane collecting tank 115 arrives the highest critical altitude; First controller 119 is controlled the aperture that strengthens propane control valve 117 again; To improve the outer defeated flow of LPGs in the propane collecting tank 115, avoid in the propane collecting tank 115 liquid level too high, in case LPG overflows.
In addition, the low-pressure propane BOG in propane spherical tank 120 gas-phase spaces also has certain air pressure, if its air pressure is excessive, can make propane spherical tank 120 impaired, if its air pressure is too small, also can make propane spherical tank 120 excessive and impaired because of the pressure that receives external atmosphere pressure.Therefore, must reasonably handle the low-pressure propane BOG in the propane spherical tank 120, make the air pressure of its gas-phase space remain on the barotropic state between the 0.6MPaG-1.4MPaG.As shown in Figure 1; This liquefaction system also comprises: two ends link to each other with propane BOG efferent duct 103 with the gas-phase space of propane spherical tank 120 respectively; With the low-pressure propane BOG step-down that flashes off in the propane spherical tank 120 is normal pressure, and it is transported to the flash distillation low-pressure propane carrier pipe 121 of propane knockout drum 102 through propane BOG efferent duct 103; Be positioned at the flash distillation low-pressure propane pressure-regulating valve 122 on the flash distillation low-pressure propane carrier pipe 121.Like this; When propane spherical tank 120 internal gas pressures are excessive; Can open flash distillation low-pressure propane pressure-regulating valve 122; Propane BOG in the propane spherical tank 120 is reduced to normal pressure along flash distillation low-pressure propane carrier pipe 121 deliver in the propane BOG efferent duct 103, and then entering compressor 104 compresses and follow-up liquefaction; In addition; The aperture magnitude relationship of flash distillation low-pressure propane pressure-regulating valve 122 is to the flow size of flash distillation low-pressure propane carrier pipe 121 delivering propane BOG; Therefore, this liquefaction system also comprises: the pressure by air pressure detector 123 (the available pressure sensor is realized) of the propane BOG that detection flash distillation low-pressure propane carrier pipe 121 is carried; Link to each other respectively with flash distillation low-pressure propane pressure-regulating valve 122 with pressure detector 123, control second controller 124 of the aperture of flash distillation low-pressure propane pressure-regulating valve 122 with the air pressure that records according to pressure detector 123.Like this, second controller can be opened flash distillation low-pressure propane pressure-regulating valve 122 when propane spherical tank 120 internal gas pressures are excessive, and regulates its aperture, with the safety of protection propane spherical tank 120.
Liquefaction system recited above can be realized the storage of compression, liquefaction and the liquefaction products of the propane BOG of normal pressure in the propane tank 101 and outer defeated; But the utility model also will relate to the liquefaction of the butane BOG of normal pressure in the butane storage tank 128; Therefore, liquefaction system shown in Figure 1 also comprises: the butane BOG liquefaction of normal pressure is the butane condenser 132 of normal pressure liquefied butane; The butane BOG efferent duct 131 that two ends link to each other with butane condenser 132 with the gaseous space of butane storage tank 128 respectively; Two ends link to each other with the liquid phase space of propane spherical tank 120 and the cold input of butane condenser 132 respectively, the low-pressure liquid propane in the propane spherical tank 120 is reduced to normal pressure be transported to butane condenser 132 so that the butane liquefaction cold carrier pipe 143 of liquefaction institute chilling requirement to be provided to it; Be positioned at the step-down choke valve 140 on the butane liquefaction cold carrier pipe 143; The butane surge tank 133 of the normal pressure liquefied butane that temporary butane condenser 132 is sent here; Normal pressure liquefied butane in butane surge tank 133 provides power to return pump 134 with the butane of it being delivered to butane storage tank 128.
It is thus clear that; Liquefaction to the butane BOG of normal pressure in the butane storage tank 128 utilizes butane condenser 132 to realize; Cold source will be the LPG behind the normal pressure for the low-pressure liquid propane in the propane tank 120, thereby the utility model connects the liquefaction of propane BOG and butane BOG, with respect to prior art; Liquefaction to butane BOG in the utility model does not re-use compressor, has just reduced the power consumption and the cost input of compressor accordingly yet.
The utility model is being provided with step-down choke valve 140 with the low-pressure liquid delivery of propane in the propane spherical tank 120 to the butane liquefaction cold carrier pipe 143 of butane condenser 132; Can realize the step-down and the cooling of low-pressure liquid propane; Thereby with the step-down of low-pressure liquid propane is the normal pressure LPG; And reduce its temperature, to satisfy the refrigeration requirement of butane liquefaction.In addition; The aperture size of step-down choke valve 140 can also be controlled the flow as the LPG in cold source; And this flow is relevant with the liquefaction demand of butane BOG; If flow is too small, then the liquefying speed of butane BOG and quality will be affected, therefore; This liquefaction system also comprises: two ends link to each other with propane BOG efferent duct 103 with the cold output of butane condenser 132 respectively, are transported to the normal pressure propane BOG carrier pipe 144 of propane knockout drum 102 through propane BOG efferent duct 103 with the normal pressure propane BOG that the normal pressure LPG gasification that loses cold in the butane condenser 132 is formed; The Temperature Detector 138 of the temperature of the normal pressure propane BOG that detection normal pressure propane BOG carrier pipe 144 is carried; Link to each other with step-down choke valve 140 with Temperature Detector 138 respectively, to control the 3rd controller 139 of the aperture of step-down choke valve 140 according to Temperature Detector 138 measured temperature.Like this; If the 3rd controller 139 judges that the temperature of the normal pressure propane BOG that normal pressure propane BOG carrier pipe 144 is carried is too high; The flow that means the LPG of originating as cold is too small, thereby its control step-down choke valve 140 increasing apertures, to improve the flow of LPG; If the 3rd controller 139 judges that the temperature of the normal pressure propane BOG that normal pressure propane BOG carrier pipe 144 is carried is low excessively; The flow that then means the LPG of originating as cold is excessive; Can waste the cold source though liquefaction is abundant; Thereby control the aperture that reduces step-down choke valve 140, thereby reduce the input flow rate in cold source.
As shown in Figure 1; The liquefied butane of the normal pressure that stores in the butane storage tank 128 can provide power by the butane output pump 136 that links to each other with butane storage tank 128 liquid phase spaces; Outer defeated to realize, outer defeated mode can be entrucking, shipment, bottling and directly outer defeated etc. through pipeline.
In sum, the utility model only is provided with a cover compressor, and it is used to compress the propane BOG of normal pressure; After the high pressure propane BOG that obtains after the compression is liquefied by the propane liquefier; The LPG that obtains through the collection of temporary, the propane collecting tank of propane surge tank, finally gets into the propane Spherical tank Storage, because the temperature of this LPG has reached outer defeated temperature successively; Thereby the LPG in the propane spherical tank can directly carry out outward defeated, need not to heat.In addition, the LPG in the propane spherical tank after reducing to normal pressure, also as butane condenser to the cold source that the butane BOG of normal pressure carries out condensation, be used for realizing liquefaction to the butane BOG of butane storage tank.Therefore, the utility model lacks than prior art has used the compressor apparatus of a cover to butane BOG, except reducing equipment investment, can also reduce the energy consumption of compressor operating aspect; The LPG that is stored in the propane spherical tank can be directly outer defeated, reduced it is heated the energy that is consumed; Sharp by butane BOG is provided after the LPG step-down in the propane spherical tank cold of liquefaction; Can reduce the energy that butane BOG liquefaction is consumed; This shows that the utility model connects the liquefaction of propane BOG and butane BOG, improved liquefaction and outer defeated complex energy utilization rate greatly.
This shows, the utlity model has following advantage:
(1) the utility model only is provided with a cover compressor; It is used to compress the propane BOG of normal pressure, and the high pressure propane BOG that obtains after the compression is by after the propane liquefier liquefaction, and the LPG that obtains is successively through the collection of temporary, the propane collecting tank of propane surge tank; The final propane Spherical tank Storage that gets into; Because the temperature of this LPG has reached outer defeated temperature, thereby the LPG in the propane spherical tank can directly carry out outer defeatedly, need not to heat.In addition, the LPG in the propane spherical tank after reducing to normal pressure, also as butane condenser to the cold source that the butane BOG of normal pressure carries out condensation, be used for realizing liquefaction to the butane BOG of butane storage tank.Therefore, the utility model lacks than prior art has used the compressor apparatus of a cover to butane BOG, except reducing equipment investment, can also reduce the energy consumption of compressor operating aspect; The LPG that is stored in the propane spherical tank can be directly outer defeated, reduced it is heated the energy that is consumed; Sharp by butane BOG is provided after the LPG step-down in the propane spherical tank cold of liquefaction; Can reduce the energy that butane BOG liquefaction is consumed; This shows that the utility model connects the liquefaction of propane BOG and butane BOG, improved liquefaction and outer defeated complex energy utilization rate greatly.
(2) the utility model is realized the propane liquefier with the aerial cooler and the propane condenser that are together in parallel; Can be at the low luck row aerial cooler of temperature in winter; Realize liquefaction to make full use of environmental low temperature, reduce the power consumption of liquefaction, then utilize the propane condenser to realize liquefaction higher summer high pressure propane BOG at temperature to high pressure propane BOG; Can reduce the number of devices of aerial cooler like this, thereby reduce the floor space of propane liquefier.Thereby the utility model also has the advantage that reduces system energy consumption and system's floor space concurrently.
(3) the utility model carries out liquefaction once more with the high pressure propane BOG in the propane collecting tank gas-phase space, also the liquefied butane in liquid phase space in the propane knockout drum is recycled, and can improve the utilization rate of propane and butane resource.
(4) the utility model cools off the lubricating oil in the compressor with LPG through siphon mode; Both improved the cooling effectiveness of lubricating oil; Enlarged the cryogenic energy utilization scope of LPG; High-pressure liquid propane can be input in the lube oil cooler automatically, guarantee that the flow of LPG satisfies the cooling needs of lubricating oil just.
The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. the liquefaction system of propane boil-off gas BOG and butane BOG is used for the butane BOG of normal pressure in the propane BOG of propane tank normal pressure and the butane storage tank is liquefied; It is characterized in that this system comprises: the propane knockout drum; The propane BOG efferent duct that two ends communicate with the gas-phase space and the said propane knockout drum of said propane tank respectively; The compressor of the propane BOG boil down to high pressure propane BOG of the normal pressure that said propane knockout drum is sent here; The high pressure propane BOG liquefaction that said compressor is sent here is the propane liquefier of high-pressure liquid propane; The propane surge tank that the said high-pressure liquid propane that said propane liquefier is sent here is kept in; Link to each other to collect the propane collecting tank of high-pressure liquid propane wherein with said propane surge tank; Store the propane spherical tank of low-pressure liquid propane; The delivery of propane pipe that two ends communicate with said propane collecting tank and said propane spherical tank respectively; Be positioned at the propane control valve on the said delivery of propane pipe; The butane BOG liquefaction of normal pressure is the butane condenser of normal pressure liquefied butane; The butane BOG efferent duct that two ends link to each other with said butane condenser with the gaseous space of said butane storage tank respectively; Two ends link to each other with the liquid phase space of said propane spherical tank and the cold input of said butane condenser respectively, the low-pressure liquid propane in the said propane spherical tank is reduced to normal pressure be transported to said butane condenser so that the butane liquefaction cold carrier pipe of liquefaction institute chilling requirement to be provided to it; Be positioned at the step-down choke valve on the said butane liquefaction cold carrier pipe; The butane surge tank of the said normal pressure liquefied butane that temporary said butane condenser is sent here; Said normal pressure liquefied butane in said butane surge tank provides power to return pump with the butane of it being delivered to said butane storage tank.
2. system according to claim 1 is characterized in that,
Said propane liquefier is the aerial cooler that utilizes the cold of air that said high pressure propane BOG is cooled off and liquefies;
And/or,
This system also comprises with said propane tank and linking to each other, and provides power with the propane output pump with its output to the LPG of wherein normal pressure; Said propane liquefier is to link to each other with said propane output pump, the propane condenser that said high pressure propane BOG is cooled off and liquefies with the cold of the said LPG that utilizes its output.
3. system according to claim 1 is characterized in that, said compressor links to each other through high pressure propane BOG carrier pipe with said propane liquefier; This system comprises that also two ends communicate with the gas-phase space and the said high pressure propane BOG carrier pipe of said propane surge tank respectively, so that the high pressure propane BOG that flashes off in the said propane surge tank is delivered to the flash distillation high pressure propane carrier pipe that said propane liquefier liquefies through said high pressure propane BOG carrier pipe.
4. system according to claim 1 is characterized in that, said compressor comprises the lube oil cooler that the lubricating oil to its inside cools off; This system also comprises: two ends link to each other with the liquid phase space of said propane surge tank and the input of said lube oil cooler respectively, and the high-pressure liquid propane in the said propane surge tank is delivered to said lube oil cooler so that the siphon pipe of cold to be provided to it through siphon mode; Two ends link to each other with the output of said lube oil cooler and the gas-phase space of said propane surge tank respectively, deliver to the cooling recurrent canal of said propane surge tank with the high pressure propane BOG that the said high-pressure liquid propane gasification that loses cold in the said lube oil cooler is formed.
5. system according to claim 1 is characterized in that, also comprises with the liquid phase space of said propane knockout drum linking to each other, and the butane lime set pump of power is provided with the liquefied butane to wherein normal pressure;
Said butane lime set delivery side of pump links to each other with said butane storage tank, the liquefied butane of said normal pressure is delivered to said butane storage tank.
6. system according to claim 1 is characterized in that, also comprises: the liquid level detector that detects the liquid level of the said high-pressure liquid propane in the said propane collecting tank; Link to each other with said propane control valve with said liquid level detector respectively, control first controller of the aperture of said propane control valve with the said liquid level that records according to said liquid level detector.
7. system according to claim 1 is characterized in that, also comprises: link to each other with said delivery of propane pipe, provide power to realize the outer defeated propane shipment pump of low-pressure liquid propane to the low-pressure liquid propane of its conveying.
8. system according to claim 1; It is characterized in that; Also comprise: two ends link to each other with said propane BOG efferent duct with the gas-phase space of said propane spherical tank respectively; With the low-pressure propane BOG step-down that flashes off in the said propane spherical tank is normal pressure, and it is transported to the flash distillation low-pressure propane carrier pipe of said propane knockout drum through said propane BOG efferent duct; Be positioned at the flash distillation low-pressure propane pressure-regulating valve on the said flash distillation low-pressure propane carrier pipe.
9. system according to claim 8 is characterized in that, also comprises: the pressure by air pressure detector that detects the propane BOG that said flash distillation low-pressure propane carrier pipe carried; Link to each other respectively with said flash distillation low-pressure propane pressure-regulating valve with said pressure detector, control second controller of the aperture of said flash distillation low-pressure propane pressure-regulating valve with the air pressure that records according to said pressure detector.
10. system according to claim 1; It is characterized in that; Also comprise: two ends link to each other with said propane BOG efferent duct with the cold output of said butane condenser respectively, are transported to the normal pressure propane BOG carrier pipe of said propane knockout drum through said propane BOG efferent duct with the normal pressure propane BOG that the normal pressure LPG gasification that loses cold in the said butane condenser is formed; Detect the Temperature Detector of the temperature of the said normal pressure propane BOG that said normal pressure propane BOG carrier pipe carried; Link to each other with said step-down choke valve with said Temperature Detector respectively, to control the 3rd controller of the aperture of said step-down choke valve according to the measured temperature of said Temperature Detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120271258 CN202221213U (en) | 2011-07-28 | 2011-07-28 | Propane boil off gas and butane boil off gas liquefying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120271258 CN202221213U (en) | 2011-07-28 | 2011-07-28 | Propane boil off gas and butane boil off gas liquefying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202221213U true CN202221213U (en) | 2012-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120271258 Withdrawn - After Issue CN202221213U (en) | 2011-07-28 | 2011-07-28 | Propane boil off gas and butane boil off gas liquefying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202221213U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353232A (en) * | 2011-07-28 | 2012-02-15 | 中国寰球工程公司 | Liquefying system and method of propane boil off gas (BOG) and butane BOG |
| CN109661549A (en) * | 2016-12-08 | 2019-04-19 | 川崎重工业株式会社 | Unstrpped gas liquefying plant and its control method |
| CN112344204A (en) * | 2020-10-23 | 2021-02-09 | 中国石油化工股份有限公司 | Low-temperature ethane loading method |
-
2011
- 2011-07-28 CN CN 201120271258 patent/CN202221213U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353232A (en) * | 2011-07-28 | 2012-02-15 | 中国寰球工程公司 | Liquefying system and method of propane boil off gas (BOG) and butane BOG |
| CN109661549A (en) * | 2016-12-08 | 2019-04-19 | 川崎重工业株式会社 | Unstrpped gas liquefying plant and its control method |
| CN112344204A (en) * | 2020-10-23 | 2021-02-09 | 中国石油化工股份有限公司 | Low-temperature ethane loading method |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120516 Effective date of abandoning: 20130424 |
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| RGAV | Abandon patent right to avoid regrant |