CN105042324A - Methane recycling control system and method - Google Patents
Methane recycling control system and method Download PDFInfo
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- CN105042324A CN105042324A CN201510304485.8A CN201510304485A CN105042324A CN 105042324 A CN105042324 A CN 105042324A CN 201510304485 A CN201510304485 A CN 201510304485A CN 105042324 A CN105042324 A CN 105042324A
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Abstract
The invention relates to a methane recycling control system and method. A third pressure control interlocking device arranged between a gas-phase heat exchange device and a liquid-phase heat exchange device and a fourth pressure control interlocking device arranged between a liquid outlet of the liquid-phase heat exchange device and a liquid pump are used for conducting interlocking control over the liquid pump. By means of the methane recycling control system and method, manual operation is avoided, the system is controlled to be started and stopped automatically, the consumption of cooling liquid is effectively controlled, energy losses are reduced to the maximum degree, and safety and reliability in the system operation process are guaranteed.
Description
Technical field
The present invention relates to the technical field of gas recycling, refer in particular to the liquefaction again and recovery that are 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.
The low temperature methane liquid that LNG filling station stores, owing to there is heat exchange with the external world, low temperature methane liquid needs self gasification (becoming gas from liquid) guarantee temperature below boiling point or boiling point, if the methane gas of this part gasification directly enters air, environmental pollution and potential safety hazard can be caused.Existing methane gas way of recycling comprise gasification methane gas out through with air heat-exchange after enter urban pipe network or use compressor that these methane gass are become the methane gas product that CNG(pressure is greater than 20MPa), enter urban pipe network scheme need LNG filling station near urban pipe network if select, inapplicable to common LNG filling station; If methane gas is processed into CNG product by Selection utilization compressor, because the market value of CNG product is lower, accumulating is complicated, and compression power consumption is higher, and equipment takes up an area larger.
Summary of the invention
For this reason, technical problem to be solved by this invention is to overcome in prior art the high and problem that the recovery rate is low of energy loss when reclaiming methane thus provides one not only can make full use of energy, reduce energy loss, and the high methane recovery control system of the recovery rate and recycling and control method.
For solving the problems of the technologies described above, a kind of methane recovery control system of the present invention, comprise gas phase heat-exchanger rig and liquid phase heat-exchanger rig, described gas phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, methane gas by Cemented filling to described gas phase heat-exchanger rig high temperature channel in, described liquid phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, the low temperature path of described liquid phase heat-exchanger rig is connected with cooling liquid by pipeline, and the high temperature channel of described gas phase heat-exchanger rig is connected with the high temperature channel of described liquid phase heat-exchanger rig, the low temperature path of described gas phase heat-exchanger rig is connected with the low temperature path of described liquid phase heat-exchanger rig, the liquid outlet of described liquid phase heat-exchanger rig is connected with liquid pump by the 4th cut-off valve, the 3rd Stress control interlock is provided with between described gas phase heat-exchanger rig and described liquid phase heat-exchanger rig, the 4th Stress control interlock is provided with between the liquid outlet of described liquid phase heat-exchanger rig and described liquid pump, described 3rd Stress control interlock and described 4th Stress control interlock carry out interlocked control by pressure reduction to described 4th cut-off valve and liquid pump.
In one embodiment of the invention, the pressure reduction of described 3rd Stress control interlock and described 4th Stress control interlock is relevant with the height of described liquid phase heat-exchanger rig.
In one embodiment of the invention, the ingress of described gas phase heat-exchanger rig is provided with methane gas described in interlocked control and flows into the first Stress control interlock that described gas phase heat-exchanger rig and described cooling liquid flow into described liquid phase heat-exchanger rig, is provided with to control the temperature that described cooling liquid flows into described liquid phase heat-exchanger rig flow and control interlock between described gas phase heat-exchanger rig and described liquid phase heat-exchanger rig.
In one embodiment of the invention, described Stress control interlock comprises and controls described cooling liquid and flow into the second cut-off valve that the first cut-off valve of described liquid phase heat-exchanger rig and described methane gas flow into described gas phase heat-exchanger rig.
In one embodiment of the invention, described temperature control interlock comprises the throttle valve that the described cooling liquid of control flows into described liquid phase heat-exchanger rig flow.
In one embodiment of the invention, the outlet of described gas phase heat-exchanger rig is provided with control and heats up the second Stress control interlock that cooling liquid flows out again, and described second Stress control interlock comprises the 3rd cut-off valve that the cooling liquid that to heat up again described in control flows into other heat-exchanger rig.
The invention also discloses a kind of methane recovery controlling method, its step is as follows, comprising: step S1: cooling liquid heat exchange being heated up forms intensification cooling liquid; Step S2: methane gas and the heat exchange of described intensification cooling liquid are carried out first order cooling, forms cooling methane gas, and the first force value formed after recording the cooling of the described first order; Step S3: cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, forms methane liquid, and the second force value formed after recording the cooling of the described second level; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment; Step S4: the second force value in the first force value in step S2 and described step S3 made comparisons, if pressure reduction is higher than when presetting the first value, reclaims and stores methane liquid; If when pressure reduction is lower than described default second value, continue to collect methane liquid, when pressure reduction is worth higher than default first, reclaim and store methane liquid.
In one embodiment of the invention, in described step S1, also comprise the step of the pressure judging methane gas and preset pressure value size, if the pressure of described methane gas is higher than the first predefined value, cooling liquid heat exchange is heated up and forms intensification cooling liquid; If the pressure of described methane gas is lower than the second predefined value, after described methane gas stops input, described cooling liquid stops input, when the pressure of methane gas is higher than the first predefined value, cooling liquid heat exchange is heated up and forms intensification cooling liquid.
In one embodiment of the invention, in described step S2, described intensification cooling liquid and described methane gas heat exchange heat up and form the cooling liquid that heats up again, and described heat up cooling liquid and miscellaneous equipment heat exchange are lowered the temperature again.
In one embodiment of the invention, in described step S3, described cooling liquid heats up with the heat exchange of cooling methane gas and forms intensification cooling liquid, judge the size of intensification cooling liquid and preset temperature value, if the temperature of intensification cooling liquid is lower than temperature low-value, reduce the flow of described cooling liquid, if the temperature of intensification cooling liquid is higher than temperature high-value, increase the flow of described cooling liquid.
Technique scheme of the present invention has the following advantages compared to existing technology:
Methane recovery control system of the present invention and recycling and control method, utilize the cold of cooling liquid to lower the temperature to methane gas, and then methane gas is liquefied, realize reclaiming methane gas, not only realize energy to make full use of, and minimizing energy loss makes the recovery rate significantly improve.
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 methane recovery system schematic described in the embodiment of the present invention one;
Fig. 2 is methane recovery system schematic described in the embodiment of the present invention two;
Fig. 3 is methane recovery system schematic described in the embodiment of the present invention three;
Fig. 4 is methane recovery system schematic described in the embodiment of the present invention four;
Fig. 5 is methane recovery control system schematic diagram described in the embodiment of the present invention five;
Fig. 6 is methane recovery control system schematic diagram described in the embodiment of the present invention six;
Fig. 7 is methane recovery control system schematic diagram described in the embodiment of the present invention seven;
Fig. 8 is methane recovery control system schematic diagram described in the embodiment of the present invention eight;
Fig. 9 is methane recovery control system schematic diagram described in the embodiment of the present invention nine;
Figure 10 is methane recovery control system schematic diagram described in the embodiment of the present invention ten;
Figure 11 is methane recovery control system schematic diagram described in the embodiment of the present invention 11.
Embodiment
Embodiment one:
As shown in Figure 1, present embodiments provide a kind of methane recovery system, comprise gas phase heat-exchanger rig 11 and liquid phase heat-exchanger rig 12, described gas phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, methane gas 10 by Cemented filling to described gas phase heat-exchanger rig 11 high temperature channel in, described liquid phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, the low temperature path of described liquid phase heat-exchanger rig is connected with cooling liquid by pipeline, and the high temperature channel of described gas phase heat-exchanger rig 11 is connected with the high temperature channel of described liquid phase heat-exchanger rig 12, the low temperature path of described gas phase heat-exchanger rig 11 is connected with the low temperature path of described liquid phase heat-exchanger rig 12.
Above-mentioned is core technology scheme of the present invention, methane recovery system of the present invention comprises gas phase heat-exchanger rig 11, described gas phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, methane gas 10 by Cemented filling to the high temperature channel of described gas phase heat-exchanger rig 11, the medium flow through in low temperature path by described gas phase heat-exchanger rig 11, for reducing the temperature of methane gas, realizes lowering the temperature to the one-level of methane gas.In order to make the medium temperature that flows in the low temperature path of described gas phase heat-exchanger rig 11 lower than the temperature of methane gas 10, particularly, methane recovery system of the present invention also comprises liquid phase heat-exchanger rig 12, described liquid phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, the high temperature channel of described gas phase heat-exchanger rig 11 is connected with the high temperature channel of described liquid phase heat-exchanger rig 12, the cooling methane gas after one-level cooling is made to be flowed into the high temperature channel of described liquid phase heat-exchanger rig 12 by the high temperature channel of described gas phase heat-exchanger rig 11, the low temperature path of described liquid phase heat-exchanger rig 12 is connected with cooling liquid 13 by pipeline, because the temperature of described cooling liquid 13 is very low, after described cooling liquid 13 enters the low temperature path of described liquid phase heat-exchanger rig 12, heat exchange is carried out with the cooling methane gas in the high temperature channel of described gas phase heat-exchanger rig 11, cooling methane gas is made to be deformed into methane liquid mutually through secondary cooling, described methane liquid is directly recycled, and recovery product is that LNG Liquefied natural gas can market goods locally.The low temperature path of described gas phase heat-exchanger rig 11 is connected with the low temperature path of described liquid phase heat-exchanger rig 12, described cooling liquid 13 forms intensification cooling liquid after the heat exchange of described liquid phase heat-exchanger rig 12, the temperature of described intensification cooling liquid is still low than the temperature of methane gas 10, entered the low temperature path of described gas phase heat-exchanger rig 11 by the low temperature path of described liquid phase heat-exchanger rig 12, thus the one-level realized methane gas 10 is carried out is lowered the temperature.The present invention adopts described cooling liquid 13 pairs of methane gas 10 to lower the temperature, and carries out reducing temperature twice to described methane gas 10, carries out one-level heat exchange with utilizing described cooling liquid 13, and its cryogenic energy utilization is more fully effective, thus the efficiency reclaiming methane liquid increases substantially; In addition, the cold in one-level cooling of the present invention derives from the cold of cooling liquid 13 described in secondary cooling, the energy is recycled to the full extent, decreases the loss of the energy, effectively improve the recovery rate of methane.
The following describes the working principle of methane recovery system:
The low temperature path that described cooling liquid 13 enters described liquid phase heat-exchanger rig 12 by pipeline forms intensification cooling liquid, and described intensification cooling liquid enters the low temperature path of described gas phase heat-exchanger rig 11; Described methane gas 10 enters the high temperature channel of described gas phase heat-exchanger rig 11, because the temperature of described intensification cooling liquid is still low than the temperature of described methane gas 10, the described intensification cooling liquid heat exchange entered in the methane gas of described gas phase heat-exchanger rig 11 high temperature channel and the low temperature path of described gas phase heat-exchanger rig 11 is lowered the temperature and is formed methane gas of lowering the temperature, and completes and lowers the temperature to the one-level of methane gas; Described cooling methane gas enters the high temperature channel of described liquid phase heat-exchanger rig 12, and lower the temperature with described cooling liquid 13 heat exchange in the low temperature path of described liquid phase heat-exchanger rig 12, complete and the secondary of methane gas is lowered the temperature, methane gas after reducing temperature twice is through being deformed into methane liquid mutually, described methane liquid is directly recycled, and recovery product is that LNG Liquefied natural gas can market goods locally.Wherein, initial cooling liquid requires no heat exchange after entering the low temperature path of described liquid phase heat-exchanger rig 12 by pipeline, flow directly into the low temperature path of described gas phase heat-exchanger rig 11, and with the heat exchange of described methane gas 10, described methane gas 10 cooling forms cooling methane gas and flows into the high temperature channel of described liquid phase heat-exchanger rig 12, thus realizes the heat exchange with described cooling liquid 13.
It is to be noted: after described cooling liquid 13 enters the low temperature path of described liquid phase heat-exchanger rig 12 by pipeline, if consider the factor such as flow and line size of described cooling liquid 13, then described cooling liquid 13 is when the low temperature path of described liquid phase heat-exchanger rig 12 is run, through heat exchange, part cooling liquid 13 becomes gaseous state mutually, part cooling liquid 13 is still liquid, thus formation gas-liquid mixture flows in the low temperature path of described gas phase heat-exchanger rig 11; The present invention for convenience of description, all enters in described liquid phase heat-exchanger rig 12 with described cooling liquid 13 and illustrates for liquid state.
In order to better reclaim methane, temperature control apparatus is provided with between described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12, described temp control controls the temperature of temperature between described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 and methane liquefaction, described temperature control apparatus controls to undergo phase transition heat exchange in described liquid phase heat-exchanger rig 12, as become liquid temperature mutually from gaseous state; Also control the heat exchange of methane gas in described gas phase heat-exchanger rig 11 simultaneously, particularly, control the temperature of the rear methane gas of one-level heat exchange cooling.
Embodiment two:
As shown in Figure 2, 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 adds the equipment of recycling, the following detailed description of:
In the present embodiment, the liquid outlet of described liquid phase heat-exchanger rig 12 is deposited tank 14 by pipeline and methane liquid and is connected, enable methane liquid finished product directly be back to described methane liquid to deposit in tank 14, thus avoid methane liquid and deposit diffusing of tank and cause reducing the problem of fluid temperature.
When the pressure of the methane liquid flowed out in order to avoid the liquid outlet of described liquid phase heat-exchanger rig 12 deposits the pressure of tank 14 lower than described methane liquid, causing methane liquid can not flow into described methane liquid deposits in tank 14, the liquid outlet of described liquid phase heat-exchanger rig 12 and described methane liquid are deposited between tank 14 and are provided with liquid pump 15, methane liquid can be flowed into smoothly described methane liquid by described liquid pump 15 to deposit in tank 14, realize the storage of liquid.
In the present embodiment, after described cooling liquid 13 flows into the low temperature path of described liquid phase heat-exchanger rig 12, heat up through heat exchange and form intensification cooling liquid, enter the low temperature path of described gas phase heat-exchanger rig 11 and described methane gas again to carry out heat exchange and form the cooling liquid that heats up again, because the temperature of the described cooling liquid that heats up again is still lower, in order to energy saving, the low temperature path of described gas phase heat-exchanger rig 11 is connected with other heat transmission equipment by pipeline, thus the cold of cooling liquid of heating up again described in can continuing to utilize, heat exchange cooling is carried out to other heat transmission equipment, in addition, the liquid outlet of described liquid phase heat-exchanger rig 12 is deposited tank 14 by pipeline with described methane liquid and is connected, in order to make full use of cold, the methane liquid reclaimed can be lowered the temperature, the liquid outlet of described liquid phase heat-exchanger rig 12 and described methane liquid are deposited between tank 14 and are provided with cooling tube 16, and described cooling tube 16 is wound in the liquid outlet of described liquid phase heat-exchanger rig 12 and described methane liquid is deposited on the pipeline between tank 14, deposit tank 14 when described methane liquid flows into described methane liquid from the liquid outlet of described liquid phase heat-exchanger rig 12 by pipeline, by the cooling of described cooling tube 16, the temperature of described methane liquid can be reduced further.When wherein said intensification cooling liquid enters the low temperature path of described gas phase heat-exchanger rig 11, if consider the factors such as the described flow of intensification cooling liquid and the size of pipeline, then described intensification cooling liquid is after the heat exchange of described gas phase heat-exchanger rig 11, part intensification cooling liquid is still liquid, part intensification cooling liquid becomes gaseous state mutually, gas can directly be discharged, as through as described in cooling tube 16 discharge.Embodiment three:
As shown in Figure 3, embodiment three is the improvement made on the basis of embodiment two, mainly changes the structure of described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12, the following detailed description of:
In the present embodiment, described liquid phase heat-exchanger rig 12 is positioned at the below of described gas phase heat-exchanger rig 11, and be all positioned at the first heat-exchanger rig 17, described first heat-exchanger rig 17 is integral type equipment, namely described first heat-exchanger rig 17 incorporates described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 two equipment, described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 is made all to be positioned at described first heat-exchanger rig 17, not only effectively save space, decrease occupation area of equipment, and described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 respectively account for a part of space, described cooling liquid 13 forms intensification cooling liquid when transferring to described gas phase heat-exchanger rig 11 by pipeline after described liquid phase heat-exchanger rig 12, effectively can reduce thermal losses, thus raising heat exchange efficiency.
In the present embodiment, the bottom of described first heat-exchanger rig 17 is provided with liquid outlet, the methane liquid that described liquid phase heat-exchanger rig 12 flows out is discharged by the liquid outlet of described first heat-exchanger rig 17, the liquid outlet of described first heat-exchanger rig 17 is deposited tank 14 by pipeline and methane liquid and is connected, thus may be used for the methane liquid of memory recall.When the pressure of the methane liquid flowed out in order to avoid the liquid outlet of described first heat-exchanger rig 17 deposits the pressure of tank 14 lower than described methane liquid, causing methane liquid can not flow into described methane liquid deposits in tank 14, the liquid outlet of described first heat-exchanger rig 17 and described methane liquid are deposited between tank 14 and are provided with liquid pump 15, methane liquid can be flowed into smoothly described methane liquid by described liquid pump 15 to deposit in tank 14, the recovery realizing liquid stores.
Embodiment four:
The present embodiment four is the improvement made on the basis of embodiment two, in order to the system of perfect recovery methane gas, the system of embodiment two adds the equipment of recycling, the following detailed description of:
As shown in Figure 4, in the present embodiment, described methane gas 10 adopts high pressure methane gas, described high pressure methane gas 10 enters the high temperature channel of described gas phase heat-exchanger rig 11, and lower the temperature with the intensification cooling liquid heat exchange in the low temperature path of described gas phase heat-exchanger rig 11 and form high pressure methane gas of lowering the temperature, complete and the one-level of methane gas is lowered the temperature; Described cooling high pressure methane gas enters the high temperature channel of described liquid phase heat-exchanger rig 12, and lower the temperature with described cooling liquid 13 heat exchange in the low temperature path of described liquid phase heat-exchanger rig 12, complete and the secondary of methane gas is lowered the temperature, methane gas after reducing temperature twice is through being deformed into high pressure methane liquid mutually, because the pressure of now high pressure methane liquid to deposit the pressure of tank 14 higher than described methane liquid, therefore methane liquid does not need liquid pump and just can flow into described methane liquid by pressure difference to deposit in tank 14, thus LNG Liquefied natural gas can be recycled on the spot.
Described methane liquid is stored in after described methane liquid deposits tank 14, the cold of methane liquid during in order to ensure that methane liquid is annotated, as methane liquid may be used for for automobile liquid feeding, in order to ensure methane liquid deposit methane liquid in tank 14 can smooth delivery of power in automobile, described methane liquid is deposited tank 14 and is connected with liquid feeding rifle 27 by compression pump 26.Particularly, described methane liquid is deposited between tank 14 and automobile and is provided with compression pump 26 and liquid feeding rifle 27, and wherein said compression pump 26 is for pressurizeing to methane liquid thus being beneficial to smooth extraction, and described liquid feeding rifle 27 uses for giving during automobile liquid feeding.In order to restart described liquid pump 15 when the methane liquid controlled in described liquid phase heat-exchanger rig 12 is stored into a certain amount of, be provided with the 5th cut-off valve 30 between described liquid phase heat-exchanger rig 12 and described liquid pump 15, described liquid pump 15 and described methane liquid are deposited between tank 14 and are provided with the 6th cut-off valve 33; In addition, in order to control the discharge of freezing mixture in described gas phase heat-exchanger rig 11, being provided with the 7th cut-off valve 31 and described liquid pump 15 and described methane liquid between described gas phase heat-exchanger rig 11 and described liquid pump 15 and depositing between tank 14 and be also provided with the 8th cut-off valve 32.
The methane liquid depositing tank 14 in order to ensure to be stored in described methane liquid has certain cold, open described 7th cut-off valve 31 and described 8th cut-off valve 32, closed described 5th cut-off valve 30 and described 6th cut-off valve 33 simultaneously, to pipeline cooling after flowing through pipeline from the freezing mixture of described gas phase heat-exchanger rig 11 discharge, and cooling air is discharged by described 8th cut-off valve 32; After pipe temperature is reduced to requirement, closed described 7th cut-off valve 31 and described 8th cut-off valve 32, open described 5th cut-off valve 30 and described 6th cut-off valve 33 simultaneously, methane liquid in described liquid phase heat-exchanger rig 12 flows into described methane liquid and deposits in tank 14, thus take full advantage of low-temperature receiver, achieve the cooling of methane liquid.
Embodiment five:
The present embodiment five is the improvement made on the basis of embodiment four, in order to the system of perfect recovery methane, adds the equipment of recycling, the following detailed description of:
As shown in Figure 5, during in order to ensure liquid feeding further, the temperature of methane liquid is in suitable low temperature range, the pipeline that described methane liquid is deposited between tank 14 and described compression pump 26 adopts bimetallic tube, comprise outer tube and interior pipe, wherein said outer tube is large pipeline, and the cooling liquid that heats up again of described gas phase heat-exchanger rig 11 discharge flows into large pipeline; Described interior pipe is small pipeline, be positioned at described outer tube, the methane liquid that described liquid phase heat-exchanger rig 12 is discharged flows into small pipeline, because the temperature of the cooling liquid that heats up again is still very low, in order to make full use of the energy, the cooling liquid that heats up again in described large pipeline provides cold for the methane liquid of stream in described small pipeline, thus further ensures cold when methane liquid flows out.
As one distortion, in order to ensure the cold reclaiming methane liquid, the pipeline that described methane liquid is deposited between tank 14 and described liquid feeding rifle 27 all adopts bimetallic tube, because advantage is identical with above-mentioned, and therefore no longer repeat specification.
Embodiment six:
The present embodiment six is the improvement made on the basis of embodiment four or embodiment five, in order to the system of perfect recovery methane, adds the equipment of recycling, the following detailed description of:
As shown in Figure 6, in order to described in further utility during liquid feeding rifle 27 liquid feeding described methane liquid also have sufficient cold all the time, be also provided with cooling tube 16 between described compression pump 26 and described liquid feeding rifle 27.Particularly, described cooling tube 16 is wound on the pipeline between described compression pump 26 and described liquid feeding rifle 27, thus can remain that the methane liquid of outflow is in suitable low temperature range.
As one distortion, in order to ensure the cold reclaiming methane liquid, described methane liquid is deposited between tank 14 and described liquid feeding rifle 27 and is also provided with cooling tube 16, and described cooling tube 16 is wound on the pipeline that described methane liquid deposits between tank 14 and described liquid feeding rifle 27.Because advantage is identical with above-mentioned, therefore no longer repeat specification.
Embodiment seven:
The present embodiment seven is the improvement made on the basis of any one embodiment described in embodiment one to embodiment six, in order to the system of perfect recovery methane, the system of any one embodiment described in embodiment one to embodiment seven adds the control apparatus of recycling, the following detailed description of:
As shown in Figure 7, the ingress of described gas phase heat-exchanger rig 11 is provided with methane gas 10 described in interlocked control and flows into the first Stress control interlock 21 that described gas phase heat-exchanger rig 11 and described cooling liquid 13 flow into described liquid phase heat-exchanger rig 12, is provided with to control the temperature that described cooling liquid 13 flows into described liquid phase heat-exchanger rig 12 flow and control interlock 22 between described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12.
In the present embodiment, described methane gas 10 flows in described gas phase heat-exchanger rig 11 for interlocked control and flows in described liquid phase heat-exchanger rig 12 by described cooling liquid 13 by described first Stress control interlock 21, by the interlocked control of described first Stress control interlock 21, avoid manual operation, realize the keying of automatic control system, not only effectively control the consumption of described cooling liquid 13, reduce energy loss to the full extent, and safe and reliable when ensure that system cloud gray model.Described temperature controls interlock 22 flows into described liquid phase heat-exchanger rig 12 flow for controlling described cooling liquid 13, thus conveniently can regulate the inlet amount of described cooling liquid 13, realizes the normal operation that LNG filling station diffuses methane recovery system.
Described Stress control interlock 21 comprises and controls described cooling liquid 13 and flow into the second cut-off valve 212 that the first cut-off valve 211 of described liquid phase heat-exchanger rig 12 and described methane gas 10 flow into described gas phase heat-exchanger rig 11, and described first Stress control interlock 21 is for the keying of the first cut-off valve 211 described in interlocked control and described second cut-off valve 212.Particularly, described first Stress control interlock 21 is provided with pressure high-value and pressure low-value, if when the pressure of described methane gas is higher than pressure high-value, first start described first cut-off valve 211, described cooling liquid 13 is made to flow in described liquid phase heat-exchanger rig 12, and then start described second cut-off valve 212, described methane gas 10 is made to flow in described gas phase heat-exchanger rig 11, thus ensure that the more described methane gas 10 of described cooling liquid 13 more early enters system, described methane gas 10 just can carry out heat exchange cooling with described cooling liquid 13 once enter described system, be beneficial to the recovery to methane liquid, the scope of wherein said pressure high-value is between 0.5Mpa-0.7Mpa, preferred described pressure high-value is 0.6Mpa, if when the pressure of described methane gas is lower than pressure low-value, first closed described second cut-off valve 212, described methane gas 10 is stopped to flow in described gas phase heat-exchanger rig 11, and then closed described first cut-off valve 211, stop described cooling liquid 13 to flow in described liquid phase heat-exchanger rig 12, make in system, there is sufficient cooling liquid all the time, thus ensure that intrasystem methane gas heat exchange is lowered the temperature, the scope of wherein said pressure low-value is between 0.1Mpa-0.3Mpa, and preferred described pressure low-value is 0.2Mpa.
Described temperature controls interlock 22 and comprises the throttle valve 221 that the described cooling liquid 13 of control flows into described liquid phase heat-exchanger rig 12 flow, described throttle valve 221 is located between described first cut-off valve 211 and described liquid phase heat-exchanger rig 12, entering flow in described liquid phase heat-exchanger rig 12 for adjusting described cooling liquid 13, realizing the normal operation that LNG filling station diffuses methane recovery system.Particularly, described temperature controls interlock 22 and is provided with temperature high-value and temperature low-value, when the temperature of the intensification cooling liquid flowed out from described liquid phase heat-exchanger rig 12 outlet is lower than described temperature low-value, turn the switch of described throttle valve 221 down, the flow that described cooling liquid 13 is entered in described liquid phase heat-exchanger rig 12 reduces, thus the temperature of intensification cooling liquid is adjusted in operating range gradually, wherein, the scope of described temperature low-value is between-180 ° to-160 °, and preferred described temperature low-value is-170 °; When the temperature of described intensification cooling liquid is higher than described temperature high-value, tune up the switch of described throttle valve 221, the flow that described cooling liquid 13 is entered in described liquid phase heat-exchanger rig 12 increases, thus the temperature of intensification cooling liquid is adjusted in operating range gradually, wherein, the scope of described temperature high-value is between-160 ° to-140 °, and preferred described temperature high-value is-150 °.
Embodiment eight:
The present embodiment eight is the improvement made on the basis of embodiment seven, in order to the system of perfect recovery methane, the reclaiming system described in embodiment seven adds the control apparatus of recycling, the following detailed description of:
As shown in Figure 8, the outlet of described gas phase heat-exchanger rig 11 is provided with the second Stress control interlock 23 that the cooling liquid that to heat up again described in control flows out, described second Stress control interlock 23 comprises the 3rd cut-off valve 231 that the cooling liquid that to heat up again described in control flows into other heat-exchanger rig, and described second Stress control interlock 23 is for by the outlet pressure of described gas phase heat-exchanger rig 11 and described 3rd cut-off valve 231 interlocked control.Because described cooling liquid 13 forms intensification cooling liquid after described liquid phase heat-exchanger rig 12, described intensification cooling liquid forms the cooling liquid that heats up again after described gas phase heat-exchanger rig 11, in order to make full use of energy, the cooling liquid that makes to heat up again can continue heat exchange, therefore need to control to heat up cooling liquid again in suitable pressure range, particularly, described second Stress control interlock 21 is provided with pressure high-value and pressure low-value, when if the pressure of the cooling liquid that heats up again described is higher than pressure high-value, start described 3rd cut-off valve 231, the cooling liquid that heats up again described in making flows in other heat-exchanger rig, the scope of wherein said pressure high-value is between 0.6Mpa-0.8Mpa, preferred described pressure high-value is 0.7Mpa, when if the pressure of the cooling liquid that heats up again described is lower than pressure low-value, closed described 3rd cut-off valve 231, the cooling liquid that heats up again described in stopping flows out, and the scope of wherein said pressure low-value is between 0.3Mpa-0.5Mpa, and preferred described pressure low-value is 0.4Mpa.
In the present embodiment, hand off valve 24 is provided with between the outlet of described gas phase heat-exchanger rig 11 and described 3rd cut-off valve 231, continue to lower the temperature to miscellaneous equipment heat exchange to make full use of cold, as to as described in cooling tube 16 lower the temperature, open described hand off valve 24 cooling liquid that can make to heat up again and flow to described cooling tube, realize the cooling to methane liquid; Temperature when described gas phase heat-exchanger rig 11 outlet port meets job requirement, when not needing to reduce temperature, and closed described hand off valve 24.
In the present embodiment, in order to the temperature of the cooling liquid that controls accurately to heat up again, make full use of cold to continue to carry out heat exchange cooling to miscellaneous equipment, the outlet port of described gas phase heat-exchanger rig 11 also can control interlock, for the inlet adjusting valve of the temperature of the cooling liquid that heats up again and described cooling liquid 13 and described throttle valve 221 are carried out interlocked control by set temperature.Particularly, described temperature controls interlock and is provided with temperature high-value and temperature low-value, when the temperature of the cooling liquid that heats up again is lower than described temperature low-value, turn the switch of described throttle valve 221 down, the flow that described cooling liquid 13 is entered in described liquid phase heat-exchanger rig 12 and described gas phase heat-exchanger rig 11 respectively reduces, thus the temperature of the cooling liquid that makes to heat up again is adjusted in operating range gradually, wherein, the scope of described temperature low-value is between-180 ° to-160 °, and preferred described temperature low-value is-170 °; When the temperature of the described cooling liquid that heats up again is higher than described temperature high-value, tune up the switch of described throttle valve 221, the flow that described cooling liquid 13 is entered in described liquid phase heat-exchanger rig 12 and described gas phase heat-exchanger rig 11 respectively increases, thus the temperature of the cooling liquid that makes to heat up again is adjusted in operating range gradually, wherein, the scope of described temperature high-value is between-160 ° to-140 °, and preferred described temperature low-value is-150 °.
Embodiment nine:
The present embodiment nine is the improvement made on the basis of any one embodiment described in embodiment one to embodiment six, in order to the system of perfect recovery methane, the system of any one embodiment described in embodiment one to embodiment seven adds the control apparatus of recycling, the following detailed description of:
As shown in Figure 9, the liquid outlet of described liquid phase heat-exchanger rig 12 is connected with liquid pump 15 by the 4th cut-off valve 251, the 3rd Stress control interlock 25A is provided with between described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12, be provided with the 4th Stress control interlock 25B between the liquid outlet of described liquid phase heat-exchanger rig 12 and described liquid pump 15, described 3rd Stress control interlock 25A and described 4th Stress control interlock 25B carries out interlocked control by pressure reduction to described 4th cut-off valve 251 and liquid pump 15.
In the present embodiment, pressure reduction between described 3rd Stress control interlock 25A and described 4th Stress control interlock 25B can the 4th cut-off valve 251 and liquid pump 15 described in interlocked control, in order to avoid opening liquid pump 15 frequently, described liquid pump 15 is restarted when the methane liquid in described liquid phase heat-exchanger rig 12 is stored into a certain amount of, effectively can control the consumption of electric energy, realize the saving of energy.The pressure reduction of described 3rd Stress control interlock 25A and described 4th Stress control interlock 25B is relevant with the height of described liquid phase heat-exchanger rig 12, particularly, described liquid phase heat-exchanger rig 12 is provided with liquid level high-value and liquid level low-value, if described pressure reduction is lower than described liquid level low-value, closed described 4th cut-off valve 251 and described liquid pump 15, methane liquid continues to be stored in described liquid phase heat-exchanger rig 12; If described pressure reduction is higher than described liquid level high-value, start described 4th cut-off valve 251 and described liquid pump 15, methane liquid in described liquid phase heat-exchanger rig 12 will be stored in and flow into described methane liquid and deposit in tank 14.As the device height of liquid phase heat-exchanger rig 12 is H as described in setting, if when described pressure reduction is lower than 0.1H-0.3H, closed described 4th cut-off valve 251 and described liquid pump 15; If when described pressure reduction is higher than 0.5H-0.7H, open described 4th cut-off valve 251 and described liquid pump 15.
Embodiment ten:
The present embodiment ten is the improvement made on the basis of embodiment nine, in order to the system of perfect recovery methane, the system of embodiment nine adds the control apparatus of recycling, the following detailed description of:
As shown in Figure 10, the ingress of described gas phase heat-exchanger rig 11 is provided with methane gas described in interlocked control and flows into the first Stress control interlock 21 that described gas phase heat-exchanger rig 11 and described cooling liquid 13 flow into described liquid phase heat-exchanger rig 12, described methane gas 10 to flow into for interlocked control and flows in described liquid phase heat-exchanger rig 12 in described gas phase heat-exchanger rig 11 and by described cooling liquid 13 by described first Stress control interlock 21, by the interlocked control of described first Stress control interlock 21, avoid manual operation, realize the keying of automatic control system, not only effectively control the consumption of described cooling liquid 13, reduce energy loss to the full extent, and safe and reliable when ensure that system cloud gray model.
The concrete structure of the Stress control interlock 21 described in the present embodiment is identical with the Stress control interlock 21 in embodiment five with effect, therefore discusses no longer in detail.
Embodiment 11:
The present embodiment 11 is the improvement made on the basis of embodiment ten, in order to the system of perfect recovery methane, the system of embodiment 11 adds the control apparatus of recycling, the following detailed description of:
As shown in figure 11, the temperature control interlock 22 that the described cooling liquid 13 of control flows into described liquid phase heat-exchanger rig 12 flow is provided with between described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12.Described temperature controls interlock 22 flows into described liquid phase heat-exchanger rig 12 flow for controlling described cooling liquid 13, thus conveniently can regulate the inlet amount of described cooling liquid 13, realizes the normal operation that LNG filling station diffuses methane recovery system.Temperature described in the present embodiment control interlock 22 concrete structure and act on and the temperature in embodiment five to control interlock 22 identical, therefore discuss no longer in detail.
In the present embodiment, the outlet of described gas phase heat-exchanger rig 11 is provided with and controls the second Stress control interlock 23 that described cooling liquid 13 flows into described gas phase heat-exchanger rig 11 flow, hand off valve 24 is provided with between the outlet of described gas phase heat-exchanger rig 11 and described 3rd cut-off valve 231, the structure of described second Stress control interlock 23 is identical with the second Stress control interlock 23 in embodiment six with effect, and the setting of hand off valve 24 described in the present embodiment is also identical with the hand off valve 24 in embodiment six, therefore discusses no longer in detail.
Embodiment seven to embodiment 11 of the present invention all with described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 be respectively two independently equipment describe the composition and working principle of methane recovery control system in detail, described gas phase heat-exchanger rig 11 and described liquid phase heat-exchanger rig 12 are all positioned to the methane recovery control system of described first heat-exchanger rig 17, its composition is identical with working principle, not in detailed discussion.
Embodiment 12:
The present embodiment provides a kind of methane recovery method, and utilize any one the methane recovery system recoveries methane liquid described in embodiment one to embodiment six, its step is as follows:
Step S1: cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid;
Step S2: first order cooling is carried out in methane gas 10 and the heat exchange of described intensification cooling liquid, forms cooling methane gas;
Step S3: cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, forms methane liquid, reclaims described methane liquid; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment.
In methane recovery method described in the present embodiment, in described step S1, described cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, after described cooling liquid 13 enters the low temperature path of described liquid phase heat-exchanger rig 12, heat up through heat exchange and form intensification cooling liquid; In described step S2, first order cooling is carried out in methane gas 10 and the heat exchange of described intensification cooling liquid, form cooling methane gas, wherein intensification cooling liquid enters the low temperature path of described gas phase heat-exchanger rig 11 from the low temperature path of described liquid phase heat-exchanger rig 12, and with methane gas 10 heat exchange in the high temperature channel of described gas phase heat-exchanger rig 11, because the temperature of described intensification cooling liquid is still low than the temperature of described methane gas 10, therefore described methane gas 10 forms cooling methane gas through first order cooling; In described step S3, cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, form methane liquid, described methane liquid is directly recycled, and to reclaim product be that LNG Liquefied natural gas can market goods locally, wherein, cooling methane gas is entered the high temperature channel of described liquid phase heat-exchanger rig 12 by the high temperature channel of described gas phase heat-exchanger rig 11, carry out second level cooling with the heat exchange of described cooling liquid 13; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment.The present invention utilizes described cooling liquid 13 to carry out reducing temperature twice to described methane gas 10, effectively methane gas being become methane liquid mutually, carrying out one-level heat exchange with utilizing cooling liquid, and its cryogenic energy utilization is more fully effective, thus the efficiency reclaiming methane liquid increases substantially; Moreover the cold in this method in first order cooling derives from the cold of cooling liquid 13 described in the cooling of the second level, makes the energy be recycled to the full extent, decreases the loss of the energy, effectively improve the recovery rate of methane.
In the present embodiment, in order to better utilize the cold of described cooling liquid 13, described step S2 also comprises: described intensification cooling liquid and described methane gas 10 heat exchange being heated up forms the cooling liquid that heats up again, because the temperature of described intensification cooling liquid and the described cooling liquid that heats up again is still very low, therefore the cooling liquid that heats up again described in can be lowered the temperature with other heat transmission equipment heat exchange, thus make full use of low-temperature receiver, effective energy saving.Particularly, the methane liquid that the described cooling liquid that heats up again also can be used for for reclaiming in described step S3 is lowered the temperature, thus can ensure the cold reclaiming methane liquid, makes the methane liquid of recovery be easier to collect and store.
In the present embodiment, utilize described methane liquid to deposit tank 14 and reclaim methane liquid, described methane liquid is stored in after described methane liquid deposits tank 14, then utilize liquid feeding rifle 27 can to automobile liquid feeding, in order to ensure that methane liquid also has sufficient cold all the time described in automobile liquid feeding process, the pipeline that described methane liquid is deposited between tank 14 to described liquid feeding rifle 27 first passes into refrigerant gas, make the cold that pipeline keeps suitable, and then discharge methane liquid in described pipeline, thus the temperature of methane liquid is reduced, and take full advantage of low-temperature receiver, improve capacity usage ratio.
Embodiment 13:
The present embodiment provides a kind of methane recovery controlling method, and utilize the methane recovery control system of embodiment seven or embodiment eight or embodiment 11 to reclaim methane liquid, its step is as follows:
Step S1: judge the pressure of methane gas 10 and the size of preset pressure value, if the pressure of described methane gas 10 is higher than the first predefined value, cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, enter step S2, if the pressure of described methane gas 10 is lower than the second predefined value, after described methane gas 10 stops input, described cooling liquid 13 stops input, when the pressure of methane gas 10 is higher than the first predefined value, cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, enter step S2;
Step S2: described methane gas 10 is carried out first order cooling with the heat exchange of described intensification cooling liquid, forms cooling methane gas;
Step S3: cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, forms methane liquid, reclaims described methane liquid; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas and forms intensification cooling liquid, enters step S2 and carries out circular treatment.
Methane recovery controlling method described in the present embodiment, in described step S1, judge the pressure of methane gas 10 and the size of preset pressure value, if when the pressure of described methane gas 10 is higher than pressure high-value, described cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, enter step S2, thus ensure that the more described methane gas 10 of described cooling liquid 13 more early enters system, described methane gas 10 just can carry out heat exchange cooling with described cooling liquid 13 once enter described system, is beneficial to the recovery to methane liquid; If the pressure of described methane gas 10 is lower than pressure low-value, after described methane gas 10 stops input, described cooling liquid 13 stops input, make in system, there is sufficient cooling liquid all the time, thus ensure to be positioned at intrasystem methane gas heat exchange cooling, when the pressure of methane gas 10 is higher than the first predefined value, cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, enter step S2.In described step S2, described methane gas 10 is carried out first order cooling with the heat exchange of described intensification cooling liquid, form cooling methane gas, simultaneously, described intensification cooling liquid and described methane gas 10 heat exchange heat up and form the cooling liquid that heats up again, the described cooling liquid that heats up again can continue for miscellaneous equipment heat exchange cooling, thus makes full use of cold, effective energy saving.In described step S3, cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, form methane liquid, reclaim described methane liquid; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas and forms intensification cooling liquid, enters step S2 and carries out circular treatment, owing to making full use of low-temperature receiver, the energy being recycled to the full extent, because this reducing the loss of the energy, effectively improve the recovery rate of methane.Controlling method of the present invention, by the unlatching of pressure automatic control system with closed, therefore not only decrease manual control, and the efficiency reclaiming methane liquid increases substantially.
In the present embodiment, described step S1 also comprises the step judging intensification cooling liquid and preset temperature value size, if the temperature of intensification cooling liquid is higher than temperature high-value, increases the flow of described cooling liquid 13; If the temperature of intensification cooling liquid is lower than temperature low-value, reduce the flow of described cooling liquid 13, thus make the temperature of intensification cooling liquid all the time in operating range.
Also comprise judgement in described step S2 to heat up again the step of cooling liquid and preset temperature value size, if the temperature of the cooling liquid that heats up again is higher than temperature high-value, increase the flow of described cooling liquid; If the temperature of the cooling liquid that heats up again is lower than temperature low-value, reduce the flow of described cooling liquid, thus the temperature of the cooling liquid that makes to heat up again is all the time in operating range.
Embodiment 14:
The present embodiment provides a kind of methane recovery controlling method, and utilize any one the methane recovery control system described in embodiment nine to embodiment 11 to reclaim methane liquid, its step is as follows:
Step S1: cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid;
Step S2: first order cooling is carried out in methane gas 10 and the heat exchange of described intensification cooling liquid, forms cooling methane gas, and the first force value formed after recording the cooling of the described first order;
Step S3: cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, forms methane liquid, and the second force value formed after recording the cooling of the described second level; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment;
Step S4: the second force value in the first force value in step S2 and described step S3 made comparisons, if pressure reduction is higher than when presetting the first value, reclaims and stores methane liquid; If when pressure reduction is lower than described default second value, continue to collect methane liquid, when pressure reduction is worth higher than default first, reclaim and store methane liquid.
Methane recovery controlling method described in the present embodiment, in described step S1, described cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid, particularly, judge the pressure of methane gas and the size of preset pressure value, if the pressure of described methane gas is higher than the first predefined value, described cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid; If the pressure of described methane gas is lower than the second predefined value, after described methane gas 10 stops input, described cooling liquid 13 stops input, when the pressure of methane gas is higher than the first predefined value, cooling liquid 13 heat exchange is heated up and forms intensification cooling liquid.In described step S2, first order cooling is carried out in methane gas 10 and the heat exchange of described intensification cooling liquid, form cooling methane gas, and the first force value formed after recording the cooling of the described first order; Described intensification cooling liquid and described methane gas 10 heat exchange simultaneously heats up and forms the cooling liquid that heats up again, and the described cooling liquid that heats up again can continue for miscellaneous equipment heat exchange cooling, thus makes full use of cold, effective energy saving.In described step S3, cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, form methane liquid, and the second force value formed after recording the cooling of the described second level; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment, thus realize recycling of the energy.In described step S4, the second force value in the first force value in step S2 and described step S3 is made comparisons, if pressure reduction is higher than when presetting the first value, is reclaimed by liquid pump 15 and store methane liquid to described methane liquid and deposit in tank 14; If when pressure reduction is lower than described default second value, continue to collect methane liquid, when pressure reduction is worth higher than default first, reclaim and store methane liquid, thus avoiding frequent starting liquid pump, reducing the consumption of electric energy.
Cooling liquid 13 of the present invention can adopt the free of contamination cryogenic media such as liquid nitrogen or liquid oxygen, even if also can directly drain in air through being deformed into gaseous state mutually; In addition, high temperature channel of the present invention is relative bit-lane, and in practical application, the medium temperature flow through in passage is all at subzero about 100 degree.
To sum up, above technological scheme of the present invention has the following advantages:
1. methane recovery control system of the present invention, pressure reduction between described 3rd Stress control interlock and described 4th Stress control interlock can the 4th cut-off valve and liquid pump described in interlocked control, in order to avoid opening liquid pump frequently, described liquid pump is restarted when the methane liquid in described liquid phase heat-exchanger rig is stored into a certain amount of, effectively can control the consumption of electric energy, realize the saving of energy.
2. methane recovery control system of the present invention, the ingress of described gas phase heat-exchanger rig is provided with methane gas described in interlocked control and flows into the first Stress control interlock that described gas phase heat-exchanger rig and described cooling liquid flow into described liquid phase heat-exchanger rig, described methane gas flows into for interlocked control and flows in described liquid phase heat-exchanger rig in described gas phase heat-exchanger rig and by described cooling liquid by described first Stress control interlock, by the interlocked control of described first Stress control interlock, avoid manual operation, realize the keying of automatic control system, not only effectively control the consumption of described cooling liquid, reduce energy loss to the full extent, and safe and reliable when ensure that system cloud gray model.
3. methane recovery control system of the present invention, is provided with between described gas phase heat-exchanger rig and described liquid phase heat-exchanger rig and controls the temperature control interlock that described cooling liquid flows into described liquid phase heat-exchanger rig flow.Described temperature controls interlock flows into described liquid phase heat-exchanger rig flow for controlling described cooling liquid, thus conveniently can regulate the inlet amount of described cooling liquid, realizes the normal operation that LNG filling station diffuses methane recovery system.
4. methane recovery controlling method of the present invention, in described step S1, heats up described cooling liquid heat exchange and forms intensification cooling liquid.In described step S2, methane gas and the heat exchange of described intensification cooling liquid are carried out first order cooling, form cooling methane gas, and the first force value formed after recording the cooling of the described first order; Described intensification cooling liquid and described methane gas heat exchange simultaneously heats up and forms the cooling liquid that heats up again, and the described cooling liquid that heats up again can continue for miscellaneous equipment heat exchange cooling, thus makes full use of cold, effective energy saving.In described step S3, cooling methane gas and described cooling liquid heat exchange are carried out second level cooling, form methane liquid, and the second force value formed after recording the cooling of the described second level; Meanwhile, described cooling liquid heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment, thus realize recycling of the energy.In described step S4, the second force value in the first force value in step S2 and described step S3 is made comparisons, if pressure reduction is higher than when presetting the first value, is reclaimed by liquid pump and store methane liquid to described methane liquid and deposit in tank; If when pressure reduction is lower than described default second value, continue to collect methane liquid, when pressure reduction is worth higher than default first, reclaim and store methane liquid, thus avoiding frequent starting liquid pump, reducing the consumption of electric energy.
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 methane recovery control system, it is characterized in that: comprise gas phase heat-exchanger rig and liquid phase heat-exchanger rig, described gas phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, methane gas by Cemented filling to described gas phase heat-exchanger rig high temperature channel in, described liquid phase heat-exchanger rig comprises at least two passages, wherein high temperature channel and low temperature path heat-shift, the low temperature path of described liquid phase heat-exchanger rig is connected with cooling liquid by pipeline, and the high temperature channel of described gas phase heat-exchanger rig is connected with the high temperature channel of described liquid phase heat-exchanger rig, the low temperature path of described gas phase heat-exchanger rig is connected with the low temperature path of described liquid phase heat-exchanger rig, the liquid outlet of described liquid phase heat-exchanger rig is connected with liquid pump by the 4th cut-off valve, the 3rd Stress control interlock is provided with between described gas phase heat-exchanger rig and described liquid phase heat-exchanger rig, the 4th Stress control interlock is provided with between the liquid outlet of described liquid phase heat-exchanger rig and described liquid pump, described 3rd Stress control interlock and described 4th Stress control interlock carry out interlocked control by pressure reduction to described 4th cut-off valve and liquid pump.
2. methane recovery control system according to claim 1, is characterized in that: the pressure reduction of described 3rd Stress control interlock and described 4th Stress control interlock is relevant with the height of described liquid phase heat-exchanger rig.
3. methane recovery control system according to claim 1, it is characterized in that: the ingress of described gas phase heat-exchanger rig is provided with methane gas described in interlocked control and flows into the first Stress control interlock that described gas phase heat-exchanger rig and described cooling liquid flow into described liquid phase heat-exchanger rig, be provided with between described gas phase heat-exchanger rig and described liquid phase heat-exchanger rig and control the temperature that described cooling liquid flows into described liquid phase heat-exchanger rig flow and control interlock.
4. methane recovery control system according to claim 3, is characterized in that: described Stress control interlock comprises and controls described cooling liquid and flow into the second cut-off valve that the first cut-off valve of described liquid phase heat-exchanger rig and described methane gas flow into described gas phase heat-exchanger rig.
5. methane recovery control system according to claim 3, is characterized in that: described temperature controls interlock and comprises the throttle valve that the described cooling liquid of control flows into described liquid phase heat-exchanger rig flow.
6. methane recovery control system according to claim 1, it is characterized in that: the outlet of described gas phase heat-exchanger rig is provided with control and heats up the second Stress control interlock that cooling liquid flows out again, described second Stress control interlock comprises the 3rd cut-off valve that the cooling liquid that to heat up again described in control flows into other heat-exchanger rig.
7. a methane recovery controlling method, its step is as follows, comprising:
Step S1: cooling liquid heat exchange is heated up and forms intensification cooling liquid;
Step S2: methane gas and the heat exchange of described intensification cooling liquid are carried out first order cooling, forms cooling methane gas, and the first force value formed after recording the cooling of the described first order;
Step S3: cooling methane gas and described cooling liquid 13 heat exchange are carried out second level cooling, forms methane liquid, and the second force value formed after recording the cooling of the described second level; Meanwhile, described cooling liquid 13 heats up with the heat exchange of cooling methane gas, forms intensification cooling liquid, enters step S2 and carry out circular treatment;
Step S4: the second force value in the first force value in step S2 and described step S3 made comparisons, if pressure reduction is higher than when presetting the first value, reclaims and stores methane liquid; If when pressure reduction is lower than described default second value, continue to collect methane liquid, when pressure reduction is worth higher than default first, reclaim and store methane liquid.
8. methane recovery controlling method according to claim 7, it is characterized in that: the step also comprising the pressure judging methane gas and preset pressure value size in described step S1, if the pressure of described methane gas is higher than the first predefined value, cooling liquid heat exchange is heated up and forms intensification cooling liquid; If the pressure of described methane gas is lower than the second predefined value, after described methane gas stops input, described cooling liquid stops input, when the pressure of methane gas is higher than the first predefined value, cooling liquid heat exchange is heated up and forms intensification cooling liquid.
9. methane recovery controlling method according to claim 7, is characterized in that: in described step S2, and described intensification cooling liquid and described methane gas heat exchange heat up and form the cooling liquid that heats up again, and described heat up cooling liquid and miscellaneous equipment heat exchange are lowered the temperature again.
10. methane recovery controlling method according to claim 7, it is characterized in that: in described step S3, described cooling liquid heats up with the heat exchange of cooling methane gas and forms intensification cooling liquid, judge the size of intensification cooling liquid and preset temperature value, if the temperature of intensification cooling liquid is lower than temperature low-value, reduce the flow of described cooling liquid, if the temperature of intensification cooling liquid is higher than temperature high-value, increase the flow of described cooling liquid.
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