CN204611334U - Methane gas reclaiming system - Google Patents
Methane gas reclaiming system Download PDFInfo
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- CN204611334U CN204611334U CN201520138771.7U CN201520138771U CN204611334U CN 204611334 U CN204611334 U CN 204611334U CN 201520138771 U CN201520138771 U CN 201520138771U CN 204611334 U CN204611334 U CN 204611334U
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Abstract
The utility model relates to a kind of methane gas reclaiming system, described system comprises flash vessel, the suction port of described flash vessel is for receiving methane gas, the air outlet of described flash vessel is connected with the suction port of compressor, the air outlet of described compressor is connected with cooling unit, and described cooling unit is connected to the refluxing opening of described flash vessel by throttle valve.The flow process of the utility model not only gas recovery is simple, and reduce the recovery power consumption of methane, and I&M cost is low, the recovery rate is high, and to reclaim product be that LNG Liquefied natural gas can market goods locally.
Description
Technical field
The utility model relates to the technical field of gas recycling, refers 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.
But in LNG ship oceangoing ship, tank car transportation process and LNG filling, uninstall process, due to the heat transmission that the huge temperature difference between ambient temperature and low temperature LNG produces, the precooling of station system and other reason, the LNG of low temperature constantly can be heated and produce boil-off gas (being called for short BOG).Although the low-temperature (low temperature) vessel storing LNG has heat insulation layer; but still the impact of outer heat cannot be avoided, cause the increase producing BOG, BOG to make the pressure increase of system; once pressure exceedes the working pressure that storage tank allows, need to start safety protection device release BOG decompression.
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 CNG (pressure is greater than the methane gas product of 20MPa).To enter urban pipe network scheme need LNG filling station near urban pipe network, inapplicable to common LNG filling station; Make CNG product market value lower, accumulating is complicated, and compression power consumption is higher, and equipment takes up an area larger.Also the low-temperature receivers such as liquid nitrogen are utilized to cool methane, again the reuse of low temperature methane liquid is become, but the method need arrange separately cold generation device, investment and run power consumption higher, flow process is complicated and occupation of land is larger, the cost of the methane reclaimed is higher, and the recovery rate is low, causes the waste of the energy to a certain extent.
In order to overcome the problems referred to above, there is the mounting structure of a kind of small-sized prizing liquefied rock gas boil-off gas recovery device of liquefied again in prior art, comprising: low-temperature storage tank, regenerating type low-temperature refrigerator, condensing heat exchanger; Condensing heat exchanger is arranged on the cold junction of regenerating type low-temperature refrigerator; Boil-off gas transfer passage and LNG Liquefied natural gas transfer passage is provided with between low-temperature storage tank and condensing heat exchanger; The LNG Liquefied natural gas at condensing heat exchanger place can enter low-temperature storage tank along LNG Liquefied natural gas transfer passage under gravity.Although above-mentioned document improves liquefaction efficiency again, ensure that equipment operational reliability and Security, but described regenerating type low-temperature refrigerator and condensing heat exchanger must be arranged on the top of described low-temperature storage tank, therefore for equipment, certain requirement is installed, not easily realizes effectively reducing I&M cost; In addition, the recovery rate of gas does not increase substantially.
Model utility content
For this reason, technical problem to be solved in the utility model is to overcome in prior art the problem that I&M cost is high and the recovery rate is low that reclaims methane thus provides a kind of I&M cost of not only equipment low, and the reclaiming system of the high methane gas of the recovery rate.
For solving the problems of the technologies described above, a kind of methane gas reclaiming system described in the utility model, described system comprises flash vessel, the suction port of described flash vessel is for receiving methane gas, the air outlet of described flash vessel is connected with the suction port of compressor, the air outlet of described compressor is connected with cooling unit, and described cooling unit is connected to the refluxing opening of described flash vessel by throttle valve.
In an embodiment of the present utility model, the liquid outlet of described flash vessel is connected with finished pot.
In an embodiment of the present utility model, between described flash vessel and described finished pot, be provided with compression pump.
In an embodiment of the present utility model, described cooling unit is water-cooling apparatus.
In an embodiment of the present utility model, described cooling unit is air-cooling device.
In an embodiment of the present utility model, described cooling unit is heat exchanger, described heat exchanger comprises at least two passages, the pipeline connection between one of them passage and described flash vessel to described compressor, the pipeline connection between another passage and described compressor to described throttle valve.
In an embodiment of the present utility model, the suction port of described flash vessel is connected with knock out drum by pipeline, and described flash vessel receives described methane gas by described knock out drum.
In an embodiment of the present utility model, between described knock out drum and described flash vessel, be provided with reduction valve.
In an embodiment of the present utility model, described reduction valve is provided with the pressure monitoring device controlling described reduction valve and compressor unlatching.
In an embodiment of the present utility model, each parts forming described methane gas reclaiming system are installed on a chassis jointly, form skid integral structure.
Technique scheme of the present utility model has the following advantages compared to existing technology:
Methane gas reclaiming system described in the utility model, utilize the high-grade cold energy that the low temperature feature of diffusing methane gas self has, the flow process of gas recovery is simple, reduces the recovery power consumption of methane, cost is low, and recovery product is that LNG Liquefied natural gas can market goods locally.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is the utility model embodiment one and the methane gas reclaiming system schematic diagram described in embodiment two;
Fig. 2 is the methane gas reclaiming system schematic diagram described in the utility model embodiment three;
Fig. 3 is the methane gas reclaiming system schematic diagram described in the utility model embodiment four;
Fig. 4 is the plan view in methane gas recovering device described in the utility model.
Embodiment
Embodiment one:
As shown in Figure 1, present embodiments provide a kind of methane gas reclaiming system, described system comprises flash vessel 12, the suction port of described flash vessel 12 is for receiving methane gas 10, the air outlet of described flash vessel 12 is connected with the suction port of compressor 14, the air outlet of described compressor 14 is connected with cooling unit, and described cooling unit is connected to the refluxing opening of described flash vessel 12 by throttle valve 15.
Above-mentioned is core technology scheme described in the utility model, methane gas reclaiming system described in the utility model comprises the flash vessel 12 for receiving methane gas 10, wherein, the suction port of described flash vessel 12 is for receiving methane gas 10, described methane gas is entered after in flash vessel 12, is separated into low-temp low-pressure methane gas and methane liquid, the air outlet of described flash vessel 12 is connected with the suction port of described compressor 14, methane gas pressurization isolated in described flash vessel 12 is formed high pressure-temperature methane gas, the air outlet of described compressor 14 is connected with cooling unit, institute's high pressure-temperature methane gas is made to form high pressure low temperature methane gas after cooling, described cooling unit is connected to the refluxing opening of described flash vessel 12 by described throttle valve 15, make described high pressure low temperature methane gas after reduced pressure treatment, form the mixture of gaseous methane and liquid methane, the mixture of described methane gas and liquid methane enters in described flash vessel 12 and is separated into low-temp low-pressure methane gas and methane liquid, wherein, described flash vessel 12, described compressor 14 and described cooling unit and described throttle valve 15 form gas circulation channel A, in described flash vessel 12, isolated low-temp low-pressure methane gas constantly circulates in gas circulation channel A, the liquid outlet of described flash vessel 12 flows out methane liquid and can form liquids recovery channel B, and the methane liquid be separated in described flash vessel 12 flows out from liquids recovery channel B.The setting of gas circulation channel A described in the utility model makes the low temperature methane gas of constantly discharging from the air outlet of described flash vessel 12 can be recycled, and effectively improves energy utilization rate, avoids energy waste, reduce recovery power consumption; The setting of described liquids recovery channel B enables methane liquid finished product directly collect recycling, thus improves energy utilization rate; Moreover the utility model technological process is simple, can make skid integral type, investment and to run power consumption little, reclaiming product is that LNG Liquefied natural gas can market goods locally, reduces methane recovery power consumption, therefore the efficiency not only reclaiming methane gas increases substantially, and reduces I&M cost.
In the present embodiment, the liquid outlet of described flash vessel 12 is connected with finished pot 16, the liquid outlet of described flash vessel 12 is connected with described finished pot 16 and forms liquids recovery channel B, methane liquid finished product is directly back in described finished pot 16, thus avoids diffusing of finished pot and cause reducing the problem of fluid temperature.
The following describes the working principle of methane gas reclaiming system:
Described methane gas enters in described flash vessel 12, the operative liquid methane carried in methane gas can by initial gross separation in flash vessel 12, liquid methane is sent back to finished pot, and enter described compressor 14 from isolated low-temp low-pressure methane gas in described flash vessel 12, high pressure methane gas is formed by compressor compresses, described high pressure methane gas forms high pressure low temperature methane gas after the cooling of described cooling unit, again through the throttling action of described throttle valve 15, wherein methane gas volumetric expansion becomes the gaseous methane of low-temp low-pressure, because methane can absorb most of heat in inflation process, thus make methane liquefy, form the mixture of gaseous methane and liquid methane.The mixture of described gaseous methane and liquid methane is back in described flash vessel 12, is separated into methane gas and methane liquid in described flash vessel 12, and described methane gas is discharged from the air outlet of described flashed vapour 12 and carried out circular treatment; Described isolated methane liquid is discharged from the liquid outlet of described flash vessel 12, is completed the recovery of methane liquid by liquids recovery channel B.
Embodiment two:
As shown in Figure 1, 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, described cooling unit is heat exchanger 13, described heat exchanger 13 comprises at least two passages, pipeline connection between one of them passage and described flash vessel 12 to described compressor 14, pipeline connection between another passage and described compressor 14 to described throttle valve 15, high-temperature methane gas after the outlet side of the described flash vessel 12 low temperature methane gas of constantly discharging and pressurization carries out heat exchange, is conducive to reducing energy loss.
The suction port of described flash vessel 12 is connected with described knock out drum 11 by pipeline, described flash vessel 12 receives described methane gas 10 by described knock out drum 11, the utility model diffuses the recovery of methane owing to can be applied to LNG filling station, make use of the pressure feature that LNG filling station diffuses methane gas, described knock out drum 11 the unstability that can overcome LNG filling station source of release is set, increase the time of this system each run.
Working principle is described in detail below in conjunction with methane gas reclaiming system in accompanying drawing 1:
The methane gas 10 flowed in it collected by described knock out drum 11 by pipeline, when the methane gas that knock out drum 11 is collected reaches a certain amount of, low-temp low-pressure methane gas in described knock out drum 11 enters in described flash vessel 12, meanwhile open compressor 14, the operative liquid methane carried in methane gas can by initial gross separation in flash vessel 12, liquid methane is sent back to finished pot 16, in described flash vessel 12, isolated low-temp low-pressure methane gas enters described heat exchanger 13, enter in described compressor 14 after the methane gas of low-temp low-pressure carries out heat exchange intensification in described heat exchanger 13, the methane gas of low-voltage high-temperature is by forming high pressure methane gas after the pressurization of described compressor 14, pressure is 8MPa and temperature raises, high pressure-temperature methane enters the low-pressure low-temperature methane gas heat exchange that described heat exchanger 13 is discharged with described flash vessel 12 air outlet, high pressure low temperature methane gas after abundant heat exchange changes the low-pressure low-temperature methane gas of lower 83 DEG C of zero temperature and the mixture of methane liquid into through the throttling action step-down cooling of described throttle valve 15, in the straight described flash vessel 12 of mixture backflow of described low-pressure low-temperature methane gas and methane liquid, described low-pressure low-temperature methane gas is separated with methane liquid by described flash vessel 12, wherein methane gas is discharged from the air outlet of described flashed vapour and is carried out circular treatment, described isolated methane liquid enters in LNG finished pot 16, is completed the recovery of methane liquid by liquids recovery channel B.
Embodiment three:
As shown in Figure 2, embodiment three is the distortion 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:
Between described knock out drum 11 and described flash vessel 12, can valve be set, this valve is preferably reduction valve 17, thus temperature can be reduced further after methane gas is reduced pressure, the cold methane gas of high-quality is supplied to described flash vessel 12, be conducive to the separation of methane gas in described flash vessel 12, low-temp low-pressure methane gas in described knock out drum 11 is decompressed to 0.1MPa through described reduction valve 17 and enters in described flash vessel 12, is conducive to obtaining more methane liquid when described flash vessel 12 carries out gas-liquid separation.
Be provided with compression pump 18 between described flash vessel 12 and described finished pot 16, for methane liquid in described flash vessel 12 is evacuated in described finished pot 16, is conducive to described methane liquid and flows in described finished pot 16, be convenient to recycle.
In the present embodiment, described cooling unit is water-cooling apparatus, and the outlet port of described compressor 14 is provided with water cooling system 19, and for the methane gas after compression being cooled, described water cooling system 19 comprises upper circulation water 191 and lower circulating water 192.In gas circulation channel A, in described flash vessel 12, isolated low-temp low-pressure methane gas enters described heat exchanger 13, enter in described compressor 14 after the methane gas of low-temp low-pressure carries out heat exchange intensification in described heat exchanger 13, high pressure methane gas is formed after low-pressure methane is pressurizeed by described compressor 14, pressure is 8MPa and temperature raises, lower the temperature through described water cooling system 19, the high pressure-temperature methane gas that described compressor 14 exports is cooled to normal temperature, particularly, high pressure methane gas is lowered the temperature by the upper circulation water 191 that shares with described compressor 14 and lower circulating water 192, methane gas after now high pressure cooling enters in described heat exchanger 13 the low-pressure low-temperature methane gas heat exchange being more conducive to discharging with described flash vessel 12 air outlet, energy required when substantially reducing heat exchange, high pressure low temperature methane gas after heat exchange through described throttle valve 15 expand step-down cooling change the low-pressure low-temperature methane gas of lower 85 DEG C of zero temperature and the mixture of methane liquid into, the mixture of described low-pressure low-temperature methane gas and methane liquid enters in described flash vessel 12, the mixture of described low-pressure low-temperature methane gas and methane liquid is separated into methane gas and callable methane liquid by described flash vessel 12.
As one distortion, this implements described cooling unit also can be set to air-cooling device, and the outlet port of described compressor 14 is provided with water air-cooling device, the methane gas after compression can be cooled equally.
In the present embodiment, described knock out drum 11 storage capacity is for equaling system hour Processing capacity.
Embodiment four:
As shown in Figure 3, embodiment four is the distortion made on the basis of embodiment three, 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:
Reduction valve 17 described in the present embodiment is pressure self-adjusting valves, described pressure self-adjusting valve is provided with the pressure monitoring device 171 controlling described pressure self-adjusting valve and compressor 14 keying, described pressure self-adjusting valve is opened when the pressure of described knock out drum 11 reaches 0.6MPa, low-temp low-pressure methane in knock out drum 11 is decompressed to 0.15MPa through described pressure self-adjusting valve and enters in described flash vessel 12, thus is conducive to the separation of methane gas in described flash vessel 12 and obtains more methane liquid.In described flash vessel 12, isolated low-temp low-pressure methane gas enters described heat exchanger 13, enter in described compressor 14 after the methane gas of low-temp low-pressure carries out heat exchange intensification in described heat exchanger 13, high pressure methane gas is formed after low-pressure methane is pressurizeed by described compressor 14, pressure is 8.5MPa and temperature raises, lower the temperature through described water cooling system 19, methane gas after high pressure cooling enters in described heat exchanger 13 the low-pressure low-temperature methane gas heat exchange being more conducive to discharging with described flash vessel 12 air outlet, thus reduction energy loss, high pressure low temperature methane gas after abundant heat exchange changes the low-pressure low-temperature methane gas of lower 90 DEG C of zero temperature and the mixture of methane liquid into through the throttling action expansion step-down cooling of described throttle valve 15, be conducive to entering the laggard row gas-liquid separation of described flash vessel 12.
Described flash vessel 12 is provided with the level monitoring device 121 controlling compression pump 18 and open and close, liquid level self-adjusting valve 122 is provided with between described compression pump 18 and described finished pot 16, described level monitoring device 121 controls the unlatching of described compression pump 18 and described liquid level self-adjusting valve 122 or closes, particularly, when described liquid level monitoring arrangement 121 detects that the liquid height inside described flash vessel 12 exceedes predefined value, described liquid level self-adjusting valve 122 and described compression pump 18 will be opened, utilize described compression pump 18 to be entered by liquid pressing in described finished pot 16.Device for detecting temperature 20 is provided with between described heat exchanger 13 and described compressor 14, temperature for monitoring methane gas ensures the trouble-free operation of system, comprises and detects the methane gas temperature flowed out from the outlet of described heat exchanger 13 and the methane gas temperature flowing to described compressor 14 entrance.
In the present embodiment, described knock out drum 11 storage capacity is for being greater than system hour Processing capacity.
Embodiment five:
The present embodiment provides a kind of methane gas recovery method, utilize embodiment one, embodiment two, embodiment three, embodiment four any one described in methane gas reclaiming system reclaim methane gas and collect methane liquid, its step is as follows: step S1: described methane gas is carried out compression formation high pressure methane gas; Step S2: described high pressure methane gas is carried out cooling and form high pressure low temperature methane gas; Step S3: described high pressure low temperature methane gas is carried out throttling, forms the mixture of gaseous methane and liquid methane; Step S4: described gaseous methane be separated with the mixture of liquid methane, returns by gaseous methane to step S1 and carries out circular treatment; Liquid methane is reclaimed.
In methane gas recovery method described in the present embodiment, the low temperature methane gas of constantly discharging from the air outlet of described flash vessel 12 can be recycled, and effectively improves energy utilization rate, avoids energy waste, reduces recovery power consumption; Described methane liquid finished product can directly be back in described finished pot 16, and recovery process is simple, and cost is low, and recovery product is that LNG Liquefied natural gas can market goods locally.
In the present embodiment, also comprise step S0 before described step S1: the methane gas that will reclaim carries out collection buffering, when the methane gas collected reaches the first predetermined amount, perform described step S1-S4, guarantee system as far as possible a working time longer, avoid frequent unlatching; And when the methane gas collected is lower than the second predetermined amount, stop performing described step S1-S4, effectively prevent in described flash vessel 12 problem of feeling suffocated.
In described step S2, the methane gas before compressing is carried out heat exchange to complete cooling, not only effectively can improve energy utilization rate in described high pressure-temperature methane gas and described step S1, and be conducive to reducing energy loss.
Described knock out drum 11 storage capacity can make methane gas continuous the automatic recovery when being more than or equal to system hour Processing capacity, thus is easy to the market goods locally realizing LNG Liquefied natural gas.
Embodiment six:
The present embodiment provides a kind of methane gas recycling and control method, utilizes any one the methane gas reclaiming system described in embodiment two, embodiment three, embodiment four to reclaim methane gas, comprising:
Step S1: the methane gas that will reclaim carries out collection buffering, utilizes pressure monitoring device to control the keying of described pressure self-adjusting valve, when the methane gas collected reaches the first predetermined amount, opens described pressure self-adjusting valve, enters step S2; When the methane gas collected is lower than the second predetermined amount, closed described pressure self-adjusting valve, continues to collect methane gas to methane gas and reaches described first predetermined amount, open described pressure self-adjusting valve, enter step S2; Step S2: start compressor, carries out compression and forms high pressure methane gas by described methane gas; Step S3: described high pressure methane gas is carried out cooling and form high pressure low temperature methane gas; Step S4: described high pressure low temperature methane gas is carried out throttling, forms the mixture of gaseous methane and liquid methane; Step S5: described gaseous methane be separated with the mixture of liquid methane, returns by gaseous methane to step S2 and carries out circular treatment; Liquid methane is reclaimed.
Methane gas recycling and control method described in the present embodiment, pressure-detecting device 171 is provided with between described knock out drum 11 and described flash vessel 12, described pressure-detecting device 171 can carry out interlocked control to the motor switch of described reduction valve 17 and described compressor 14, be conducive to prolongation system separate run times, now described reduction valve 17 is pressure self-adjusting valves.This method judges whether to open reclaiming system by the pressure of monitoring described knock out drum 11, once the pressure of described knock out drum 11 higher than the first predetermined amount and pressure high-value, open described pressure self-adjusting valve, whole system is opened automatically, and the methane gas in described knock out drum 11 enters in described gas circulation channel A and described liquids recovery channel B respectively; If when the pressure of described knock out drum 11 is lower than the second predetermined amount and pressure low-value, closed described pressure self-adjusting valve, continuation collection methane gas to methane gas reaches described first predetermined amount, opens described pressure self-adjusting valve, start up system.Moreover, controlling method described in the utility model, by the keying of pressure interlock control system, is conducive to prolongation system separate run times, avoids using manpower to control, solve the Automated condtrol problem of methane recovery, so both saved human cost to additionally reduce inoperative power cost.
In the present embodiment, the pressure requirements that the setting of described pressure low-value runs based on follow-up system is considered, if hypotony, the methane gas in described knock out drum 11 will be difficult to flow in described flash vessel 12, easily feel suffocated; The pressure in methane gas 10 source is diffused in the setting of described pressure high-value based on leading portion, when described pressure high-value is higher than when diffusing the pressure of methane source gas, can collect in described knock out drum 11 and abundant diffuse methane gas, to ensure that described knock out drum 11 storage capacity is for being more than or equal to system hour recovery ability, make system as far as possible a working time longer, avoid frequent unlatching.If when the pressure of described knock out drum 11 is lower than pressure low-value, whole system is closed, if when the pressure of described knock out drum 11 is higher than pressure high-value, whole system is opened, particularly, when the pressure of described knock out drum 11 is lower than 0.1Mpa-0.3Mpa, halt system runs, being preferably described pressure low-value is 0.2Mpa, and halt system runs; When the pressure of knock out drum 11 is higher than open system during 0.5Mpa-0.7Mpa, being preferably described pressure high-value is 0.6Mpa open system.
In order to improve the automatic recovery of methane gas, in the present embodiment, described flash vessel 12 outlet port and described compressor 14 inlet pipe place are provided with device for detecting temperature 20, and wherein, described device for detecting temperature 20 is provided with temperature alarming high-value and temperature parking high-value.When the temperature detected is higher than temperature alarming high-value, system automatic alarm, whether detection system is normally run; When the temperature detected is higher than parking high-value, close described pressure self-adjusting valve and described compressor 14, system automatic stopping.Described device for detecting temperature 20 is for carrying out interlocked control to the motor of described pressure self-adjusting valve and described compressor 14, be conducive to monitoring described heat exchanger 13 and described compressor 14 whether normal operation, not only can effective monitoring running situation, and can essential safety be accomplished.Wherein, setting temperature warning high-value object is the temperature by monitoring described compressor 14 entrance methane gas, as too high in temperature may show as described in heat exchanger 13 break down or as described in compressor 14 to export methane gas temperature too high, affect overall operation.When methane gas temperature between described heat exchanger 13 and described compressor 14 is higher than temperature alarming high-value, system automatic alarm; When methane gas temperature between described heat exchanger 13 and described compressor 14 is higher than parking high-value, system automatic stopping.Particularly, if the entrance methane gas temperature of described compressor 14 is higher than 10 DEG C-30 DEG C, system automatic alarm, if preferably the entrance methane gas temperature of described compressor 14 is higher than 15 DEG C, system is with regard to automatic alarm; If when the Outlet Gas Temperature of described heat exchanger 13 is higher than 20 DEG C-40 DEG C, system automatic stopping, if when preferably the Outlet Gas Temperature of described heat exchanger 13 is higher than 30 DEG C, system automatic stopping.When actual process sets, temperature parking high-value is higher than temperature alarming high-value.
In order to constantly improve the automatic recovery of methane gas, in the present embodiment, described flash vessel 12 is provided with liquid level detection device 121, is provided with liquid level self-adjusting valve 122 between described compression pump 18 and described finished pot 16.Described liquid level detection device 121 is provided with liquid level high-value and liquid level low-value, after in described flash vessel 12, described methane gas is separated into methane liquid, the liquid level of methane liquid is detected by liquid level detection device 121, when the liquid level of the methane liquid detected is higher than liquid level high-value, start compression pump 18, methane liquid is transported in finished pot 16; When the liquid level of the methane liquid detected is lower than liquid level low-value, close compression pump 18, the present embodiment is by carrying out interlocked control to motor switch on described compression pump 18 and described liquid level self-adjusting valve 122, thus be conducive to the separate run times extending described compression pump 18, avoid full liquid in described flash vessel 12 to note problem or the too low problem causing gas to seal in described compression pump 18 of liquid level of not air inlet body.
In the present embodiment, the setting of described liquid high-value runs based on total system, if store enough methane liquid to open the frequent unlatching that described compression pump 18 can avoid described compression pump 18 again, if the liquid level in described flash vessel 12 also can cause the described flash vessel 12 upper end gas space too small higher than liquid high-value, described flash vessel 12 internal air pressure is caused to raise, if higher than when entering the methane gas pressure of described flash vessel 12, can cause coming gas to enter, easily cause and feel suffocated; The setting of described liquid low-value is based on consideration once liquid level is lower, and the methane gas in described flash vessel 12 may be mixed into methane liquid and enter in finished pot 16.In order to ensure can to enter smoothly liquids recovery channel B from the isolated methane liquid of described flash vessel, liquid level in described flash vessel 12 is higher than starting described compression pump 18 during liquid level high-value, if when the liquid level in described flash vessel 12 is lower than liquid level low-value, close described compression pump 18.Particularly, when the liquid level on described flash vessel 12 reaches the 60%-80% of described flash vessel 12 general assembly liquid height, start described compression pump 18, and open described liquid level self-adjusting valve 122, being preferably described liquid level high-value is 70% of general assembly liquid height in described flash vessel 12; When the liquid level on described flash vessel 12 is lower than 10%-30%, close described compression pump 18 and described liquid level self-adjusting valve 122, being preferably described liquid level low-value is 20% of described flash vessel 12 general assembly liquid height.
In the present embodiment, also comprise between described step S1 and S2 and initial gross separation is carried out to the liquid methane carried in methane gas, isolated liquid methane is delivered to finished pot 16, methane gas is transported to compressor 14, perform step S2.
In the present embodiment, methane gas continuous the automatic recovery can be made when described knock out drum 11 storage capacity is more than or equal to system hour Processing capacity, thus be easy to the market goods locally realizing LNG Liquefied natural gas.
Embodiment seven:
As shown in Figure 4, the methane gas reclaiming system of the present embodiment according to embodiment three or embodiment four provides a kind of methane gas recovering device, this recovering device is made package unit, the each parts forming described methane gas reclaiming system are installed on a chassis jointly, form skid integral structure, thus ensure that operational reliability and Security, concrete size can require design according to actual motion, if skid body is 10 meters * 6 meters * 2.5 meters, wherein length is 10 meters, wide is 6 meters, height is 2.5 meters, wherein, described knock out drum 11 to skid body inwall distance is vertically 2m, described knock out drum 11 to skid body inwall distance is in the horizontal direction 1.8m, described knock out drum 11 is 3.5m to described flash vessel 12 distance vertically, described flash vessel 12 is 3m to described compression pump 18 distance vertically and described heat exchanger 13 to described compressor 14 distance vertically, described flash vessel 12 is 3m to described heat exchanger 13 distance in the horizontal direction.
In the utility model, described knock out drum 11 source of the gas is LNG filling process, LNG finished pot diffuses process, LNG cistern car decompression process etc.
To sum up, above technological scheme described in the utility model has the following advantages:
1. the utility model can be applied to the recovery that LNG filling station diffuses methane, make use of the pressure feature that LNG filling station diffuses methane gas, described knock out drum the unstability that can overcome LNG filling station source of release is set, increase the time of this system each run; High-temperature methane gas after the setting of described gas circulation channel makes the low temperature methane gas of constantly discharging from the air outlet of described flash vessel and pressurization carries out heat exchange, reduces energy loss; The setting of described liquids recovery passage enables methane liquid finished product directly be back in described finished pot, thus avoids diffusing of finished pot and cause reducing the problem of fluid temperature; Moreover the utility model technological process is simple, can make skid integral type, investment and to run power consumption little, reclaiming product is that LNG Liquefied natural gas can market goods locally, reduces methane recovery power consumption, therefore the efficiency not only reclaiming methane gas increases substantially, and reduces I&M cost.
2. be provided with reduction valve between knock out drum described in the utility model and described flash vessel, thus temperature can be reduced further after methane gas is reduced pressure, be conducive to the separation of methane gas in described flash vessel thus obtain more methane liquid; Be provided with compression pump between described flash vessel and described finished pot, be conducive to described methane liquid and flow in described finished pot, be convenient to recycle; The outlet port of described compressor is provided with water cooling system, is conducive to lowering the temperature to high pressure methane gas, energy required when being convenient to reduce follow-up heat exchange.
3. reduction valve described in the utility model is provided with the pressure monitoring device controlling described reduction valve and compressor unlatching, described pressure-detecting device can carry out interlocked control to the motor switch of described reduction valve and described compressor, is conducive to prolongation system separate run times; Described flash vessel outlet port and described compressor inlet duct place are provided with device for detecting temperature, described device for detecting temperature is used for carrying out interlocked control to the motor of described reduction valve and described compressor, be conducive to monitoring described heat exchanger and described compressor whether normal operation, not only can effective monitoring running situation, and can essential safety be accomplished; Described flash vessel is provided with liquid level detection device, liquid level self-adjusting valve is provided with between described compression pump and described finished pot, after methane gas described in described flash vessel is separated into methane liquid, open liquid level detection device, interlocked control is carried out to motor switch on described compression pump and described liquid level self-adjusting valve, thus be conducive to the separate run times extending described compression pump, avoid the full liquid of described flash vessel to note problem or the too low problem causing gas to seal in described compression pump of liquid level of not air inlet body.
4., in methane gas recovery method described in the utility model, the high-temperature methane gas after the air outlet of the described flash vessel low temperature methane gas of constantly discharging and pressurization carries out heat exchange, energy loss can be made little, avoid energy waste, reduce recovery power consumption; Described methane liquid finished product can directly be back in described finished pot, and recovery process is simple, and cost is low, and recovery product is that LNG Liquefied natural gas can market goods locally.
5. methane gas recycling and control method described in the utility model, in order to improve the automatic recovery of methane gas, described flash vessel outlet port and described compressor inlet duct place are provided with device for detecting temperature, described device for detecting temperature is used for carrying out interlocked control to the motor of described reduction valve and described compressor, be conducive to monitoring described heat exchanger and described compressor whether normal operation, not only can effective monitoring running situation, and can essential safety be accomplished.
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 that the utility model creates.
Claims (10)
1. a methane gas reclaiming system, it is characterized in that: described system comprises flash vessel (12), the suction port of described flash vessel (12) is for receiving methane gas (10), the air outlet of described flash vessel (12) is connected with the suction port of compressor (14), the air outlet of described compressor (14) is connected with cooling unit, and described cooling unit is connected to the refluxing opening of described flash vessel (12) by throttle valve (15).
2. methane gas reclaiming system according to claim 1, is characterized in that: the liquid outlet of described flash vessel (12) is connected with finished pot (16).
3. methane gas reclaiming system according to claim 2, is characterized in that: be provided with compression pump (18) between described flash vessel (12) and described finished pot (16).
4. methane gas reclaiming system according to claim 1, is characterized in that: described cooling unit is water-cooling apparatus (19).
5. methane gas reclaiming system according to claim 1, is characterized in that: described cooling unit is air-cooling device.
6. methane gas reclaiming system according to claim 1, it is characterized in that: described cooling unit is heat exchanger (13), described heat exchanger (13) comprises at least two passages, pipeline connection between one of them passage and described flash vessel (12) to described compressor (14), the pipeline connection between another passage and described compressor (14) to described throttle valve (15).
7. methane gas reclaiming system according to claim 1, it is characterized in that: the suction port of described flash vessel (12) is connected with knock out drum (11) by pipeline, and described flash vessel (12) receives described methane gas (10) by described knock out drum (11).
8. methane gas reclaiming system according to claim 7, is characterized in that: be provided with reduction valve (17) between described knock out drum (11) and described flash vessel (12).
9. methane gas reclaiming system according to claim 8, is characterized in that: described reduction valve (17) is provided with and controls described reduction valve (17) and the pressure monitoring device (171) opened of compressor (14).
10. according to the methane gas reclaiming system in claim 1-9 described in any one, it is characterized in that: each parts forming described methane gas reclaiming system are installed on a chassis jointly, form skid integral structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104696700A (en) * | 2015-03-11 | 2015-06-10 | 新奥气化采煤有限公司 | Methane gas recycling system and methane gas recycling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104696700A (en) * | 2015-03-11 | 2015-06-10 | 新奥气化采煤有限公司 | Methane gas recycling system and methane gas recycling method |
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Effective date of registration: 20170126 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang Xinyuan host new Austrian Science and Technology Park in Southern District Patentee before: ENN Coal Gasification Co., Ltd. |
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Address after: Building software No. 662 410006 Hunan province Yuelu District City Lugu Avenue (Changsha professional building No. 539) Patentee after: The new Austrian Energy Engineering Technology Co., Ltd. Address before: Building software No. 662 410006 Hunan province Yuelu District City Lugu Avenue (Changsha professional building No. 539) Patentee before: New Austrian Gas Engineering Company Limited |
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