CN104832780A - Compressed methane gas recovery system and method - Google Patents
Compressed methane gas recovery system and method Download PDFInfo
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- CN104832780A CN104832780A CN201510262181.XA CN201510262181A CN104832780A CN 104832780 A CN104832780 A CN 104832780A CN 201510262181 A CN201510262181 A CN 201510262181A CN 104832780 A CN104832780 A CN 104832780A
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Abstract
The invention relates to a compressed methane gas recovery system and method. Recovery of compressed methane gas is achieved by utilizing a heat exchange device and multiple stages of compression devices, wherein an inlet of a first-stage compression device is connected with a first channel of the heat exchange device by a pipeline; an outlet of the first-stage compression device is connected with a second channel of the heat exchange device by a pipeline; the second channel of the heat exchange device is connected with an inlet of a second-stage compression device by a pipeline. Compressed and heated gases are utilized to heat raw cooling gases and simultaneously cool compressed gases, thus not only omitting heat exchange of other media but also improving the recovery efficiency.
Description
Technical field
The present invention relates to the technical field of gas recycling, refer in particular to the recovery being applied in boil-off gas (BOG) in LNG Liquefied natural gas (LNG) storage and transportation process.
Background technique
LNG Liquefied natural gas (LNG) main component is methane, being recognized is the energy the cleanest on the earth, colourless, tasteless, nontoxic and non-corrosiveness, its volume is about with amount gaseous natural gas volume 1/625, and the weight of LNG Liquefied natural gas is only about 45% of consubstantiality ponding.LNG Liquefied natural gas is natural gas via compression, be cooled to its boiling temperature after become liquid, usual LNG storage subzero 161.5 degrees Celsius, in the low-temperature storage tank of about 0.1MPa, with special purpose ship or fuel tank transport, again gasify during use.Very little to atmospheric pollution after LNG Liquefied natural gas burning, and liberated heat is large, so LNG Liquefied natural gas is a kind of more advanced energy.
Existing LNG system has good insulation, but in the process stored and operate, because the heat transmission in the external world and the cooling of system need, its inside inevitably can produce the boil-off gas (Boiled Off Gas is called for short BOG) of some.Along with the continuous increase of BOG quantity, the temperature and pressure of LNG internal system can increase, when the safety relief pressure of LNG tank internal pressure higher than default, the Safety valve of LNG storage tank tank deck will be opened, flare system of directly being released to by BOG is burnt, with stable system internal pressure.Go into operation the initial stage in LNG receiving station, downstream external transport pipeline or gas user pipe network do not reach the gas condition or less with gas demand of connecing, and therefore LNG receiving station often can be in zero outer defeated operating mode or the low discharge defeated operating mode outward of long period several weeks to several months.In these cases, the LNG in LNG storage system can become BOG by continuous endothermic gasification, and too much BOG directly can be discharged and burn, thus causes economic loss and the environmental pollution problem of great number.At present, conventional BOG zero discharge treatment device is all utilize BOG liquefaction plant to BOG direct liquefaction, returned in LNG storage tank, and due to BOG natural evaporation and produce a not stable process, need repeatedly to open and close BOG liquefaction plant, and BOG liquefaction plant reaches operation from startup often needs 3 hours even 5 hours, the reuse efficiency when methane gas is diffused in recovery is directly caused significantly to reduce, and it is more difficult during practical operation, easily cause the unstability of system pressure, as too low in LNG pressure of storage tank, just need the measures such as extra tonifying Qi pressurize; In addition, described liquefaction plant generally includes the plurality of devices such as cooling unit, compression set, therefore cause the reclaiming system of methane gas more complicated, and floor space is bigger than normal.
Summary of the invention
For this reason, technical problem to be solved by this invention is to overcome in prior art and reclaims problem that when diffusing methane, reuse efficiency is low thus provide one not only can improve the recovery rate, and the reclaiming system of the simple compressed methane gas of recovery plant and recovery method.
For solving the problems of the technologies described above, a kind of compressed methane gas reclaiming system of the present invention, comprise the heat-exchanger rig for receiving described methane gas, described heat-exchanger rig at least comprises two passages, described compressed methane gas reclaiming system also comprises the multistage compressing device be connected with described heat-exchanger rig, wherein the entrance of first order compression set is connected by the first passage of pipeline with described heat-exchanger rig, the outlet of described first order compression set is connected by the second channel of pipeline with described heat-exchanger rig, and the second channel of described heat-exchanger rig is connected by pipeline with the entrance of second level compression set.
In one embodiment of the invention, described heat-exchanger rig is connected with knock out drum by pipeline.
In one embodiment of the invention, described multistage compressing device is respectively independently compression set.
In one embodiment of the invention, described multistage compressing device is multiple compressing sections of same compression set.
In one embodiment of the invention, be provided with heating device between the entrance of described first order compression set and described heat-exchanger rig, described heating device is wound on the pipeline between described first order compression set and described heat-exchanger rig.
In one embodiment of the invention, described heating device is heat exchange-type equipment, which is provided with companion's hot feed mouth and accompanies hot discharge port.
In one embodiment of the invention, the hot equipment of described companion is heating type equipment.
Present invention also offers a kind of compressed methane gas recovery method, its step is as follows, comprising: step S1: methane gas heat exchange being heated up forms intensification methane gas; Step S2: the pressurization of intensification methane gas is formed High Temperature High Pressure methane gas; Step S3: the methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange and lower the temperature and form high pressure methane gas of lowering the temperature; Step S4: cooling high pressure methane gas is pressurizeed again and forms compressed methane gas.
In another embodiment of the present invention, before described step S1, also comprise the step of carrying out methane gas to collect buffering.
In another embodiment of the present invention, in described step S1, by accompanying hot equipment, methane gas heat exchange is heated up.
Technique scheme of the present invention has the following advantages compared to existing technology:
Methane gas reclaiming system of the present invention and recovery method, the gas after utilizing compression to heat up heats up to former cooled gas, gives the cooling of the gas after compression simultaneously, has both eliminated the heat exchange of other medium, and turn improved the efficiency of recovery.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the schematic diagram of compressed methane gas reclaiming system described in the embodiment of the present invention one;
Fig. 2 is the schematic diagram of compressed methane gas reclaiming system described in the embodiment of the present invention two;
Fig. 3 is the schematic diagram of compressed methane gas reclaiming system described in the embodiment of the present invention three;
Fig. 4 is the schematic diagram of compressed methane gas recovery control system described in the embodiment of the present invention four;
Fig. 5 is the schematic diagram of compressed methane gas recovery control system described in the embodiment of the present invention five.
Embodiment
Embodiment one:
As shown in Figure 1, present embodiments provide a kind of compressed methane gas reclaiming system, comprise the heat-exchanger rig 11 for receiving described methane gas, described heat-exchanger rig 11 at least comprises two passages, described compressed methane gas reclaiming system also comprises the multistage compressing device be connected with described heat-exchanger rig 11, wherein the entrance of first order compression set 121 is connected by the first passage of pipeline with described heat-exchanger rig 11, the outlet of described first order compression set 121 is connected by the second channel of pipeline with described heat-exchanger rig 11, and the second channel of described heat-exchanger rig 11 is connected by pipeline with the entrance of second level compression set 122.
Above-mentioned is core technology scheme of the present invention, compressed methane gas reclaiming system of the present invention, the multistage compressing device comprising the heat-exchanger rig 11 for receiving described methane gas and be connected with described heat-exchanger rig 11, wherein, described heat-exchanger rig 11 at least comprises two passages, the first passage of described heat-exchanger rig 11 is connected by the entrance of pipeline with first order compression set 121, the low temperature methane gas entered in the first passage of described heat-exchanger rig 11 heats up through heat exchange and flows into the entrance of described first order compression set 121, because the temperature of low temperature methane gas is lower, usually at subzero about 160 °, if directly enter compression set can cause compression set cisco unity malfunction, and the methane gas after heating up can meet the temperature requirement of normal temperature compressed device, avoid using expensive low temperature compression device, the outlet of described first order compression set 121 is connected by the second channel of pipeline with described heat-exchanger rig 11, because described methane gas forms High Temperature High Pressure methane gas after the pressurization of described first order compression set 121, described High Temperature High Pressure methane gas enters the second channel of described heat-exchanger rig 11 by pipeline, high pressure methane gas of lowering the temperature is formed with the low temperature methane gas heat exchange in the first passage of described heat-exchanger rig 11, simultaneously, low temperature methane gas heat exchange in the first passage of described heat-exchanger rig 11 heats up thus can be directly inputted in described first order compression set 121, utilize described first order compression set 121 to export the methane gas after heating up to heat up to the methane gas of described first order compression set 121 ingress, therefore the heat exchange utilizing other medium had both been eliminated, fully save energy again, significantly improve capacity usage ratio, effectively reduce the floor space of equipment, the second channel of described heat-exchanger rig 11 is connected by pipeline with the entrance of second level compression set 122, because the temperature of described cooling high pressure methane gas controls in the temperature range of normal temperature compressed device, therefore, described cooling high pressure methane gas can flow directly in described second level compression set 122 and compress, while avoiding using special requirement compression set, significantly improve the working efficiency of compression set, final formation compressed methane gas.
In the present embodiment, described multistage compressing device is respectively independently compression set, comprises first order compression set 121 and second level compression set 122, also can arrange the 3rd pole compression device as required.
Consider the unstability that LNG filling station methane gas discharges, described heat-exchanger rig 11 is connected with knock out drum 13 by pipeline, described knock out drum 13 is for receiving the methane gas of LNG filling station, collection buffering is carried out to diffusing methane gas, input in time collecting a certain amount of in described heat-exchanger rig 11, thus avoid the continuous service of system.
The following describes the working principle of methane gas reclaiming system:
Low temperature methane gas enters in described knock out drum 13 and collects, input in the first passage of described heat-exchanger rig 11 in time collecting a certain amount of, described low temperature methane gas heat exchange heats up and forms intensification methane gas, enter in described first order compression set 121 by pipeline, in described first order compression set 121, High Temperature High Pressure methane gas is formed to described intensification methane gas compression, described High Temperature High Pressure methane gas enters in the second channel of described heat-exchanger rig 11 by the outlet of described first order compression set 121 by pipeline, heat exchange is carried out with low temperature methane gas in the first passage of described heat-exchanger rig 11, the temperature of High Temperature High Pressure methane gas is reduced and forms cooling high pressure methane gas, described cooling high pressure methane gas is delivered in described second level compression set 122 and compresses, final formation compressed methane gas, meanwhile, in the first passage of described heat-exchanger rig 11, the heat exchange of low temperature methane gas heats up and forms intensification methane gas, directly can be delivered in described first order compression set 122, realize recycling energy.
Embodiment two:
Embodiment two is the improvement made on the basis of embodiment one, in order to the system of perfect recovery methane gas, the system of embodiment one is improved the structure of described multistage compressing device, the following detailed description of:
As shown in Figure 2, described multistage compressing device 12 is multiple compressing sections of same compression set, can comprise first order compression set 12A as required, second level compression set 12B, third level compression set etc.Compare and the independent compression device in embodiment one, the occupation area of equipment of the present embodiment two reduces.
In the present embodiment, described multistage compressing device 12 is a compression set, and first order compression set 12A is former sections of compressions of compression set, and second level compression set 12B is the rear several sections of compressions of compression set.After intensification methane gas enters compression set, high temperature pressing methane gas is drawn at certain setting compression stage, particularly, as in first order compression set 12A as described in corresponding in this stage to as described in methane gas compression form High Temperature High Pressure methane gas, entered the flow in described heat-exchanger rig 11 first passage by the inlet temperature adjustment methane gas of compression set, thus make the inlet temperature of compression set be not less than the rated temperature of compression set.The present embodiment realizes object methane gas being formed compressed methane gas by compression set under the prerequisite not increasing compression set manufacture cost, and is finally delivered to other system follow-up.
Embodiment three:
Embodiment three is the distortion made on the basis of embodiment one or embodiment two, in order to the system of perfect recovery methane gas, the system of embodiment one or embodiment two adds the equipment of recycling, the following detailed description of:
As shown in Figure 3, in described compressed methane gas reclaiming system, after in initial cryogenic methane gas to be entered described heat-exchanger rig 11 first passage by described knock out drum 13, also intensification methane gas is not formed in the second channel of described heat-exchanger rig 11, the temperature of the methane gas flowed out in the first passage of described heat-exchanger rig 11 is still very low, can not be directly inputted in described first order compression set 12A, therefore heating device 14 is provided with between the entrance of described first order compression set 12A and described heat-exchanger rig 11, described heating device 14 is wound on the pipeline between described first order compression set 12A and described heat-exchanger rig 11, when the methane gas flowed out in the first passage from described heat-exchanger rig 11 flows into the entrance of described first order compression set 12A, after heating by described heating device 14, the methane gas temperature of described first order compression set 12A ingress is raised, can flow directly in described first order compression set 12A and carry out pressurized operation.
In order to realize the heat temperature raising by described heating device 14 pairs of methane gas, described heating device 14 is heat exchange-type equipment, which is provided with companion's hot feed mouth 141 and accompany hot discharge port 142, high temperature media flows in described heating device 14 by companion's hot feed mouth 141, flowed out by the hot discharge port 142 of described companion, thus can realize heating up to the heat exchange of low temperature methane gas in pipeline.As one distortion, the hot equipment 14 of described companion also can be heating type equipment, is heated, thus the temperature of described low temperature methane gas is raised by heating type equipment to the pipeline between from described heat-exchanger rig 11 to described first order compression set 12A entrance.
Described high temperature media can be water or other fluid, in order to energy saving, avoids waste, flows out high temperature media can continue to utilize for miscellaneous equipment from the hot discharge port 142 of described companion; Described heating type equipment can be the heating plant of the common form such as electric heating.
Embodiment four:
The present embodiment four is the distortion made on the basis of embodiment one or embodiment two, in order to the system of perfect recovery methane gas, the system of embodiment four adds the monitoring equipment for controlling gas the automatic recovery, the following detailed description of:
As shown in Figure 4, present embodiments provide a kind of compressed methane gas recovery control system, be provided with the methane gas controlled in described knock out drum 13 between described knock out drum 13 and described heat-exchanger rig 11 and enter to be provided with between the Stress control interlock 15 of described heat-exchanger rig 11 and the entrance of described heat-exchanger rig 11 and described first order compression set 12A and control the temperature that described multistage compressing device 12 opens and closes and control interlock 16.
In the present embodiment, described Stress control interlock 15 methane gas controlled in described knock out drum 13 flows in described heat-exchanger rig 11, and when the outlet pressure of described knock out drum 13 is greater than the first predefined value, methane gas flows in described heat-exchanger rig 12; When the outlet pressure of described knock out drum 13 is less than the second predefined value, methane gas can not flow in described heat-exchanger rig 12.Described temperature controls the keying that interlock 16 controls described multistage compressing device 12, particularly, when the temperature of the methane gas flowed out from described heat-exchanger rig 12 is in setting range, starts described first order compression set 12A; When the temperature of the cooling high pressure methane gas that the low temperature methane gas in the methane gas that described first order compression set 12A flows out and described heat-exchanger rig 12 first passage is formed after heat exchange is in setting range, start described second level compression set 12B, the normal startup of described multistage compressing device 12 when the setting range of wherein said temperature is between-10 ° to 0 °, can be ensured.The present embodiment controls by described Stress control interlock 15 and described temperature the keying that interlock 16 directly controls whole system, realizes automatically working, avoids people for manually-operable, labor-saving while, has also increased substantially reuse efficiency.
In the present embodiment, described Stress control interlock 15 comprises the methane gas controlled in described knock out drum 13 and enters the first cut-off valve 151 of described heat-exchanger rig 11 and regulate methane gas to enter the modulating valve 152 of described heat-exchanger rig 11 uninterrupted.Particularly, described first cut-off valve 151 is arranged between described knock out drum 13 and described heat-exchanger rig 11, and described modulating valve 152 is arranged between described first cut-off valve 151 and described heat-exchanger rig 11.Described Stress control interlock 15 is provided with pressure high-value and pressure low-value, wherein the scope of pressure high-value is between 0.5Mpa to 0.7Mpa, pressure high-value described in prioritizing selection is 0.6Mpa, the scope of described pressure low-value is between 0.1Mpa to 0.3Mpa, pressure low-value described in prioritizing selection is 0.2Mpa, if the pressure that described knock out drum 13 exports is higher than described pressure high-value, then start described first cut-off valve 151 and described modulating valve 152, methane gas in described knock out drum 13 flows in described heat-exchanger rig 11, described modulating valve 152 is controlled according to the temperature that described heat-exchanger rig 11 exports, the flow that aperture can ensure compression set minimum load opened by described modulating valve 152, if the pressure that described knock out drum 13 exports is lower than described pressure low-value, then closed described first cut-off valve 151, makes methane gas stop entering in described heat-exchanger rig 11, simultaneously closed described multistage compressing device 12, thus ensure system as far as possible a working time longer, avoid frequent unlatching.
In the present embodiment, described temperature controls interlock 16 and regulates described modulating valve 152 according to the outlet temperature of described heat-exchanger rig 11, if the outlet temperature of described heat-exchanger rig 11 is higher than the rated temperature value of described multistage compressing device 12, as as described in the outlet temperature of heat-exchanger rig 11 higher than 0 ° time, then tune up described modulating valve 152, the flow making low temperature methane gas enter described heat-exchanger rig 11 increases, thus ensures that the outlet temperature of described heat-exchanger rig 11 is between-10 ° to 0 °; If temperature is lower than the rated temperature value of described multistage compressing device 12, as as described in the outlet temperature of heat-exchanger rig 11 lower than-10 ° time, then turn described modulating valve 152 down, the flow making low temperature methane gas enter described heat-exchanger rig 11 reduces, thus ensures that the outlet temperature of described heat-exchanger rig 11 is between-10 ° to 0 °.
Embodiment five
The present embodiment five is the distortion made on the basis of embodiment four, in order to the system of perfect recovery methane gas, the system of embodiment four adds the monitoring equipment for controlling gas the automatic recovery, the following detailed description of:
As shown in Figure 5, heating device 14 is provided with between the entrance of described first order compression set 12A and described heat-exchanger rig 11, described heating device 14 is wound on the pipeline between described first order compression set 12A and described heat-exchanger rig 11, wherein, described heating device 14 is heat exchange-type equipment, which is provided with companion's hot feed mouth 141 and accompany hot discharge port 142, high temperature media flows in described heating device 14 by companion's hot feed mouth 141, flowed out by the hot discharge port 142 of described companion, thus can realize heating up to the heat exchange of methane gas in pipeline.
In order to automatically control the keying of described heating device 14, companion's hot feed 141 of described heating device 14 is provided with the second cut-off valve 143, medium for controlling described companion's hot feed mouth 141 flows in described heating device 14, the temperature of the methane gas exported when described heat-exchanger rig 11 is lower than the rated temperature value of described multistage compressing device 12, as as described in the outlet temperature of heat-exchanger rig 11 lower than-10 ° time, open described second cut-off valve 143, the medium of described companion's hot feed mouth 141 is made to flow in described heating device 14, the methane gas in described heat-exchanger rig 11 outlet port is heated up, the temperature of the methane gas exported when described heat-exchanger rig 11 is higher than the rated temperature value of described multistage compressing device 12, as as described in the outlet temperature of heat-exchanger rig 11 between-10 ° to 0 ° time, closed described second cut-off valve 143, opens described multistage compressing device 12.
As one distortion, the hot equipment 14 of described companion also can be heating type equipment, is heated, thus the temperature of described methane gas is raised by heating type equipment to the pipeline between from described heat-exchanger rig 11 to described first order compression set 12A entrance.
Embodiment six:
The present embodiment provides a kind of compressed methane gas recovery method, utilize embodiment one, embodiment two, embodiment three any one described in compressed methane reclaiming system reclaim methane gas, it specifically comprises the steps:
Step S1: methane gas heat exchange is heated up and forms intensification methane gas; Step S2: the pressurization of intensification methane gas is formed High Temperature High Pressure methane gas; Step S3: the methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange and lower the temperature and form high pressure methane gas of lowering the temperature; Step S4: cooling high pressure methane gas is pressurizeed again and forms compressed methane gas.
Compressed methane gas recovery method described in the present embodiment, in described step S1, heats up the methane gas heat exchange of low-temp low-pressure and forms intensification low-pressure methane gas; In described step S2, the pressurization of intensification low-pressure methane gas is formed High Temperature High Pressure methane gas; In described step S3, low-temp low-pressure methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange to lower the temperature and form high pressure methane gas of lowering the temperature, and make the low-temp low-pressure methane gas intensification in described step S1 form intensification methane gas, circulate from described step S2, owing to utilizing the step of compression, low-temp low-pressure methane gas is heated up and form intensification methane gas, and carry out heat exchange cooling with the low-temp low-pressure methane gas before compression, eliminate the heat exchange of other medium, therefore effectively save energy; Meanwhile, make the intensification of low-temp low-pressure methane gas realize the step of directly carrying out pressurizeing, and make the cooling of the High Temperature High Pressure methane gas of described step S2 realize the step of directly carrying out pressurizeing, therefore significantly improve working efficiency; In described step S4, cooling high pressure methane gas is pressurizeed again thus forms compressed methane gas.
In the present embodiment, before described step S1, also comprise the step of carrying out methane gas to collect buffering, consider the unstability that LNG filling station methane gas discharges, carrying out collection buffering to diffusing methane gas, entering again in described step S1 in time collecting a certain amount of, thus avoiding the continuous service of system.
Forming the step of intensification methane gas to realize the heat exchange of low-temp low-pressure methane gas being heated up in described step S1, can carry out by the hot equipment of described companion 14 pairs of methane gas the object that heat exchange realizes intensification.
Embodiment seven:
The present embodiment provides a kind of compressed methane gas recycling and control method, and utilize the compressed methane recovery control system described in embodiment four to reclaim methane gas, it specifically comprises the steps:
Step S1: the methane gas that will reclaim carries out collection buffering by knock out drum 13, judges the described outlet pressure of knock out drum 13 and the size of preset pressure value, when the outlet pressure of described knock out drum 13 is higher than the first predefined value, enters step S2; When the outlet pressure of described knock out drum 13 is lower than the second predefined value, continues to collect the outlet pressure of methane gas to described knock out drum 13 higher than the first predefined value, enter step S2; Step S2: methane gas heat exchange heated up and form intensification methane gas, judges that the temperature of intensification methane gas is whether in setting range, if the temperature of intensification methane gas is in setting range, enters step S3; If the temperature of intensification methane gas is not in setting range, continues to be warming up to the temperature of intensification methane gas in setting range to methane gas heat exchange, enter step S3; Step S3: the pressurization of intensification methane gas is formed High Temperature High Pressure methane gas; Step S4: the methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange and lower the temperature and form high pressure methane gas of lowering the temperature; Step S5: cooling high pressure methane gas is pressurizeed again and forms compressed methane gas.
In methane gas recycling and control method described in the present embodiment, in described step S1, the Stress control interlocking methane gas filled in the described knock out drum of 15 control 11 is utilized to enter described heat-exchanger rig 11, when the outlet pressure of described knock out drum 13 is higher than the first predefined value, particularly, if the pressure that described knock out drum 13 exports is higher than described pressure high-value, then described first cut-off valve 151 and described modulating valve 152 is started, methane gas in described knock out drum 13 flows in described heat-exchanger rig 11, enters step S2; When the outlet pressure of described knock out drum 13 is lower than the second predefined value, particularly, if the pressure that described knock out drum 13 exports is lower than described pressure low-value, then closed described first cut-off valve 151, and close described multistage compressing device 12 simultaneously, make methane gas stop entering in described heat-exchanger rig 11, continue to collect the outlet pressure of methane gas to described knock out drum 13 higher than pressure high-value, methane gas flows into described heat-exchanger rig 11, enters step S2.In described step S2, utilize described temperature to control interlock 16 and judge that the temperature of intensification methane gas is whether in setting range, if the temperature of intensification methane gas is in setting range, if the temperature of intensification methane gas is between-10 ° to 0 °, enters step S3; If the temperature of intensification methane gas is not in setting range, continues to be warming up to the temperature of intensification methane gas in setting range to methane gas heat exchange, enter step S3.In described step S3, the pressurization of intensification methane gas is formed High Temperature High Pressure methane gas.In described step S4, the methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange and lower the temperature and form high pressure methane gas of lowering the temperature, enter step S5, and the methane gas in described step S1 is heated up form intensification methane gas, circulate from described step S3.Described step S4 comprises the step judging described intensification methane gas temperature, if the temperature of intensification methane gas is in setting range, enters step S3; If the temperature of intensification methane gas is not in setting range, continue to be warming up to the temperature of intensification methane gas in setting range to methane gas heat exchange, enter step S3, particularly, if the temperature of intensification methane gas is not in setting range, make the temperature of intensification methane gas in setting range by the large I regulating methane gas to enter described heat-exchanger rig 11 flow.In this step, not only make the methane gas in step S1 heat up, and the High Temperature High Pressure methane gas in step S4 is lowered the temperature, therefore recycling of energy is achieved, abundant energy saving, significantly improves capacity usage ratio, thus the floor space of effective minimizing equipment.In described step S5, cooling high pressure methane gas is pressurizeed again and forms compressed methane gas, the present embodiment by interlocked control thus the automatic safe realizing equipment run, effectively reduce human cost simultaneously.
Embodiment eight:
The present embodiment provides a kind of methane gas recycling and control method, and utilize the compressed methane gas recovery control system described in embodiment five to reclaim methane gas, the place different from methane gas recycling and control method described in embodiment seven is step S2, the following detailed description of:
In step S2 described in the present embodiment, methane gas heat exchange is heated up and forms intensification methane gas, judge that the temperature of intensification methane gas is whether in setting range, if the temperature of intensification methane gas is in setting range, enters step S3, if the temperature of intensification methane gas is not in setting range, continue to be warming up to the temperature of intensification methane gas in setting range to methane gas heat exchange, enter step S3, because the temperature of initial methane gas is very low, can not directly enter in described step S3, can be heated up to methane gas heat exchange by the second cut-off valve 143 opened on companion's hot feed mouth 141 of the hot equipment 14 of companion and form intensification methane gas, and judge that the temperature of intensification methane gas is whether in setting range, if the temperature of intensification methane gas is in setting range, closed described second cut-off valve 143, start described first order compression set 12A, enter step S3, if the temperature of intensification methane gas is not in setting range, continues to be warming up to the temperature of intensification methane gas in setting range to methane gas heat exchange, enter step S3.
Compression set of the present invention can be compressor, and described heat-exchanger rig is heat exchanger; The compressed methane gas of finally discharging from described multistage compressing device 12 can directly utilize, and also can leave methane in and deposit in tank.
To sum up, above technological scheme of the present invention has the following advantages:
1. compressed methane gas reclaiming system of the present invention, the multistage compressing device comprising the heat-exchanger rig for receiving described methane gas and be connected with described heat-exchanger rig, wherein, described heat-exchanger rig at least comprises two passages, the first passage of described heat-exchanger rig is connected by the entrance of pipeline with first order compression set, the low temperature methane gas entered in the first passage of described heat-exchanger rig heats up through heat exchange and flows into the entrance of described first order compression set, because the temperature of low temperature methane gas is lower, usually at subzero about 160 °, if directly enter compression set can cause compression set cisco unity malfunction, and the methane gas after heating up can meet the temperature requirement of normal temperature compressed device, avoid using expensive low temperature compression device, the outlet of described first order compression set is connected by the second channel of pipeline with described heat-exchanger rig, because described methane gas forms High Temperature High Pressure methane gas after the pressurization of described first order compression set, described High Temperature High Pressure methane gas enters the second channel of described heat-exchanger rig by pipeline, high pressure methane gas of lowering the temperature is formed with the low temperature methane gas heat exchange in the first passage of described heat-exchanger rig, simultaneously, low temperature methane gas heat exchange in the first passage of described heat-exchanger rig heats up thus can be directly inputted in described first order compression set, utilize described first order compression set to export the methane gas after heating up to heat up to the methane gas of described first order compression set ingress, therefore the heat exchange utilizing other medium had both been eliminated, fully save energy again, significantly improve capacity usage ratio, effectively reduce the floor space of equipment, the second channel of described heat-exchanger rig is connected by pipeline with the entrance of second level compression set, because the temperature of described cooling high pressure methane gas controls in the temperature range of normal temperature compressed device, therefore, described cooling high pressure methane gas can flow directly in the compression set of the described second level and compress, while avoiding using special requirement compression set, significantly improve the working efficiency of compression set, final formation compressed methane gas.
2. compressed methane gas reclaiming system of the present invention, after in initial methane gas to be entered described heat-exchanger rig first passage by described knock out drum, also intensification methane gas is not formed in the second channel of described heat-exchanger rig, the temperature of the methane gas flowed out in the first passage of described heat-exchanger rig is still very low, can not be directly inputted in described first order compression set, therefore heating device is provided with between the entrance of described first order compression set and described heat-exchanger rig, described heating device is wound on the pipeline between described first order compression set and described heat-exchanger rig, when the methane gas flowed out in the first passage from described heat-exchanger rig flows into the entrance of described first order compression set, after heating by described heating device, the temperature of described methane gas is raised, can flow directly in described first order compression set and carry out pressurized operation.
3. compressed methane gas reclaiming system of the present invention, described multistage compressing device is multiple compressing sections of same compression set, can comprise first order compression set as required, second level compression set, third level compression sets etc., compare independently multiple compression set, and its occupation area of equipment reduces
4. compressed methane gas recovery method of the present invention, in described step S1, heats up the methane gas heat exchange of low-temp low-pressure and forms intensification low-pressure methane gas; In described step S2, the pressurization of intensification low-pressure methane gas is formed High Temperature High Pressure methane gas; In described step S3, low-temp low-pressure methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange to lower the temperature and form high pressure methane gas of lowering the temperature, and make the low-temp low-pressure methane gas intensification in described step S1 form intensification methane gas, circulate from described step S2, owing to utilizing the step of compression, low-temp low-pressure methane gas is heated up and form intensification methane gas, and carry out heat exchange cooling with the low-temp low-pressure methane gas before compression, eliminate the heat exchange of other medium, therefore effectively save energy; Meanwhile, make the intensification of low-temp low-pressure methane gas realize the step of directly carrying out pressurizeing, and make the cooling of the High Temperature High Pressure methane gas of described step S2 realize the step of directly carrying out pressurizeing, therefore significantly improve working efficiency; In described step S4, cooling high pressure methane gas is pressurizeed again thus forms compressed methane gas.
Obviously, above-described embodiment is only for clearly example being described, the restriction not to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all mode of executions.And thus the apparent change of extending out or variation be still in the protection domain of the invention.
Claims (10)
1. a compressed methane gas reclaiming system, comprise the heat-exchanger rig for receiving described methane gas, described heat-exchanger rig at least comprises two passages, it is characterized in that: described compressed methane gas reclaiming system also comprises the multistage compressing device be connected with described heat-exchanger rig, wherein the entrance of first order compression set is connected by the first passage of pipeline with described heat-exchanger rig, the outlet of described first order compression set is connected by the second channel of pipeline with described heat-exchanger rig, and the second channel of described heat-exchanger rig is connected by pipeline with the entrance of second level compression set.
2. compressed methane gas reclaiming system according to claim 1, is characterized in that: described heat-exchanger rig is connected with knock out drum by pipeline.
3. compressed methane gas reclaiming system according to claim 1, is characterized in that: described multistage compressing device is respectively independently compression set.
4. compressed methane gas reclaiming system according to claim 1, is characterized in that: described multistage compressing device is multiple compressing sections of same compression set.
5. compressed methane gas reclaiming system according to claim 1, it is characterized in that: be provided with heating device between the entrance of described first order compression set and described heat-exchanger rig, described heating device is wound on the pipeline between described first order compression set and described heat-exchanger rig.
6. compressed methane gas reclaiming system according to claim 5, is characterized in that: described heating device is heat exchange-type equipment, which is provided with companion's hot feed mouth and accompanies hot discharge port.
7. compressed methane gas reclaiming system according to claim 5, is characterized in that: the hot equipment of described companion is heating type equipment.
8. a compressed methane gas recovery method, its step is as follows, comprising:
Step S1: methane gas heat exchange is heated up and forms intensification methane gas;
Step S2: the pressurization of intensification methane gas is formed High Temperature High Pressure methane gas;
Step S3: the methane gas in High Temperature High Pressure methane gas and described step S1 is carried out heat exchange and lower the temperature and form high pressure methane gas of lowering the temperature;
Step S4: cooling high pressure methane gas is pressurizeed again and forms compressed methane gas.
9. compressed methane gas recovery method according to claim 8, is characterized in that: before described step S1, also comprises the step of carrying out methane gas to collect buffering.
10. compressed methane gas recovery method according to claim 8, is characterized in that: in described step S1, heats up to methane gas heat exchange by accompanying hot equipment.
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