CN104832782B - Compressed methane gas recovery control system and recycling and control method - Google Patents
Compressed methane gas recovery control system and recycling and control method Download PDFInfo
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- CN104832782B CN104832782B CN201510262920.5A CN201510262920A CN104832782B CN 104832782 B CN104832782 B CN 104832782B CN 201510262920 A CN201510262920 A CN 201510262920A CN 104832782 B CN104832782 B CN 104832782B
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Abstract
The present invention relates to a kind of compressed methane gas recovery control system and recycling and control method, the automatically working of system is realized by setting pressure interlock device and temperature interlock, is entered wherein between surge tank and heat-exchanger rig provided with the methane gas controlled in the surge tank between the Stress control interlock of the heat-exchanger rig and the entrance of the heat-exchanger rig and one stage of compression device provided with the temperature control interlock for controlling the multistage compressing device to open and close.The present invention realizes equipment essential safety while human cost is reduced, and eliminates the heat exchange of other media, saves energy consumption, improves organic efficiency.
Description
Technical field
The present invention relates to the technical field of gas recycling, refer in particular to apply in liquefied natural gas（LNG）Storage
With boil-off gas in transportation（BOG）Recovery.
Background technology
Liquefied natural gas（LNG）Main component is methane, and it is the energy most clean on the earth to be recognized, colourless, tasteless, nothing
Poison and non-corrosiveness, its volume is about the 1/625 of same amount gaseous natural gas volume, and the weight of liquefied natural gas is only consubstantiality ponding
45% or so.Liquefied natural gas is that natural gas is compressed, is cooled to after its boiling temperature and becomes liquid, usual liquefied natural gas
It is stored in subzero 161.5 degrees Celsius, in 0.1MPa or so low-temperature storage tank, is transported with special purpose ship or oil truck, weight when using
New gasification.It is very small to air pollution after liquefied natural gas burning, and liberated heat is big, so liquefied natural gas is a kind of
The more advanced energy.
Existing LNG systems have good insulation, but during storage and operation, because of extraneous heat transfer
Needed with the cooling of system, a number of boil-off gas can be inevitably generated inside it（Boiled Off Gas, referred to as
BOG）.With being continuously increased for BOG quantity, the temperature and pressure of LNG internal systems can be increased, when LNG tank insides
When pressure is higher than the safety relief pressure of default, the safety-valve of LNG storage tank tank decks will be opened, and BOG is directly released
To flare system burning, with systems stabilisation internal pressure.Gone into operation initial stage, downstream external transport pipeline or gas user in LNG receiving stations
Pipe network, which does not reach, connects gas bar part or smaller with gas demand, therefore LNG receiving stations can often be in long period several weeks to several months
Defeated operating mode outside defeated operating mode or low discharge outside zero.In these cases, the LNG in LNG storage systems can continuous endothermic gasification into
BOG, excessive BOG directly can be discharged and burnt, so as to cause the economic loss and problem of environmental pollution of great number.Mesh
Before, conventional BOG zero discharge treatments device is all, to BOG direct liquefactions, to back into LNG storages using BOG liquefying plants
In tank, and natural evaporation due to BOG and a not stable process is produced, it is necessary to open and close BOG liquefying plants repeatedly, and
BOG liquefying plants reach that operation generally requires 3 hours even 5 hours from startup, directly result in when methane gas is diffused in recovery
Organic efficiency is greatly lowered, and more difficult during practical operation, easily causes the unstability of system pressure, such as LNG pressure of storage tank
It is too low, be accomplished by the measures such as extra tonifying Qi pressurize；In addition, the liquefying plant generally includes cooling device, compression set etc.
Plurality of devices, therefore cause the recovery system of methane gas more complicated, and floor space is bigger than normal.
The content of the invention
Therefore, the technical problems to be solved by the invention are to overcome reclaims organic efficiency when diffusing methane in the prior art
Low the problem of, a kind of can not only improve the rate of recovery, and the recovery control of the simple compressed methane gas of reclaimer so as to provide
System processed and recycling and control method.
In order to solve the above technical problems, a kind of compressed methane gas recovery control system of the present invention, including for connecing
The surge tank of the methane gas, and the heat-exchanger rig being connected with the surge tank are received, the heat-exchanger rig at least includes two
Individual passage, the compressed methane gas recovery system also includes the multistage compressing device being connected with the heat-exchanger rig, wherein the
The entrance of one stage of compression device is connected by pipeline with the first passage of the heat-exchanger rig, the first order compression set
Outlet is connected by pipeline with the second channel of the heat-exchanger rig, and the second channel of the heat-exchanger rig is pressed with the second level
The entrance of compression apparatus is connected by pipeline, provided with the control surge tank between the surge tank and the heat-exchanger rig
Methane gas enters the Stress control interlock and the heat-exchanger rig and the one stage of compression device of the heat-exchanger rig
Provided with the temperature control interlock for controlling the multistage compressing device to open and close between entrance.
In one embodiment of the invention, the Stress control interlock includes controlling the methane in the surge tank
Gas enters the first stop valve and regulation methane gas of the heat-exchanger rig into the regulating valve of the heat-exchanger rig flow.
In one embodiment of the invention, the Stress control interlock is provided with pressure high-value and pressure low level
Value, if the pressure of surge tank outlet is higher than the pressure high-value, starts first stop valve and the regulating valve；
If the pressure of the surge tank outlet is less than the pressure low-value, first stop valve and multi-stage compression dress are closed
Put.
In one embodiment of the invention, the temperature control interlock is according to the outlet temperature of the heat-exchanger rig
The regulating valve is adjusted, if the outlet temperature of the heat-exchanger rig is higher than rated value, the regulating valve is tuned up, enters methane gas
The flow for entering the heat-exchanger rig increases；If the outlet temperature of the heat-exchanger rig is less than rated value, the regulating valve is turned down,
The flow for making methane gas enter the heat-exchanger rig is reduced.
In one embodiment of the invention, companion is provided between the entrance and the heat-exchanger rig of the one stage of compression device
Thermal, the heating device is wound on the pipeline between the one stage of compression device and the heat-exchanger rig.
In one embodiment of the invention, the heat tracing charging aperture of the heating device is provided with the second stop valve.
Present invention also offers a kind of compressed methane gas recycling and control method, its step is as follows, including：Step S1：Will
The methane gas of recovery is collected buffering by surge tank, judge the surge tank outlet pressure and preset pressure value it is big
It is small, when the outlet pressure of the surge tank is higher than the first preset value, into step S2；When the outlet pressure of the surge tank is low
When the second preset value, continue to collect methane gas to the outlet pressure of the surge tank higher than the first preset value, into step S2；
Step S2：Methane gas heat exchange heating is formed into heating methane gas, the temperature of heating methane gas is judged whether in setting range, if
The temperature for the methane gas that heats up is in setting range, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue
The temperature for being warming up to heating methane gas is exchanged heat to methane gas in setting range, into step S3；Step S3：It will heat up methane gas
It is pressed to form HTHP methane gas；Step S4：HTHP methane gas is exchanged heat with the methane gas in the step S1
Cooling forms cooling high pressure methane gas；Step S5：Will cooling high pressure methane gas repressurization formation compressed methane gas.
In another embodiment of the present invention, in the step S2, on the heat tracing charging aperture by opening heat tracing equipment
The second stop valve to methane gas heat exchange heating formed heating methane gas, judge heating methane gas temperature whether in setting range
It is interior, if the temperature of heating methane gas closes second stop valve, into step S3 in setting range；If heating up methane gas
Temperature not in setting range, continue to methane gas exchange heat be warming up to heating methane gas temperature in setting range, enter
Step S3.
In another embodiment of the present invention, the step S4 includes judging the step of the heating methane gas temperature
Suddenly, if the temperature of heating methane gas is in setting range, into step S3；If the temperature for the methane gas that heats up is not in setting range
It is interior, continue to exchange heat to methane gas the temperature for being warming up to heating methane gas in setting range, into step S3.
In one embodiment of the invention, in the step S4, if the temperature of heating methane gas is not in setting range,
Enter the temperature for being sized so that heating methane gas of the heat-exchanger rig flow in setting range by adjusting methane gas.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：
Methane gas recovery control system and recycling and control method of the present invention, by set pressure interlock device and
Temperature interlock realizes the automatically working of system, realizes equipment essential safety while reducing human cost, and save
The heat exchange of other media, saves energy consumption, improves organic efficiency.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention
Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the schematic diagram of compressed methane gas recovery system described in the embodiment of the present invention one；
Fig. 2 is the schematic diagram of compressed methane gas recovery system described in the embodiment of the present invention two；
Fig. 3 is the schematic diagram of compressed methane gas recovery system described in the embodiment of the present invention three；
Fig. 4 is the schematic diagram of compressed methane gas recovery control system described in the embodiment of the present invention four；
Fig. 5 is the schematic diagram of compressed methane gas recovery control system described in the embodiment of the present invention five.
Embodiment
Embodiment one：
As shown in figure 1, a kind of compressed methane gas recovery system is present embodiments provided, including for receiving the methane gas
Heat-exchanger rig 11, the heat-exchanger rig 11 at least includes two passages, and the compressed methane gas recovery system also includes and institute
The multistage compressing device that heat-exchanger rig 11 is connected is stated, the wherein entrance of first order compression set 121 is changed by pipeline with described
The first passage of thermal 11 is connected, and the outlet of the first order compression set 121 passes through pipeline and the heat-exchanger rig 11
Second channel be connected, and the second channel of the heat-exchanger rig 11 and the entrance of second level compression set 122 pass through pipeline
It is connected.
Above-mentioned is core technology scheme of the present invention, compressed methane gas recovery system of the present invention, including for
The multistage compressing device for receiving the heat-exchanger rig 11 of the methane gas and being connected with the heat-exchanger rig 11, wherein, it is described
Heat-exchanger rig 11 at least includes two passages, and the first passage of the heat-exchanger rig 11 passes through pipeline and first order compression set
121 entrance is connected, and institute is flowed into by heat exchange heating into the low temperature methane gas in the first passage of the heat-exchanger rig 11
The entrance of first order compression set 121 is stated, because the temperature of low temperature methane gas is relatively low, generally at subzero 160 ° or so, if directly
Compression set cisco unity malfunction can be caused into compression set by tapping into, and the methane gas after heating can meet normal temperature compressed
The temperature requirement of device, it is to avoid use expensive low temperature compression device；The outlet of the first order compression set 121 passes through
Pipeline is connected with the second channel of the heat-exchanger rig 11, because the methane gas passes through the first order compression set 121
Pressurization after formed HTHP methane gas, the HTHP methane gas by pipeline enter the heat-exchanger rig 11 second
Low temperature methane gas in passage, with the first passage of the heat-exchanger rig 11 exchanges heat to form cooling high pressure methane gas, meanwhile, it is described
Low temperature methane gas heat exchange in the first passage of heat-exchanger rig 11 heats up to be directly inputted into the first order compression set
In 121, the methane gas after heating is exported to the entrance of first order compression set 121 using the first order compression set 121
The methane gas heating at place, therefore the heat exchange using other media had both been eliminated, and energy has fully been saved, significantly improve energy
Utilization rate, effectively reduces the floor space of equipment；The second channel of the heat-exchanger rig 11 and second level compression set 122
Entrance is connected by pipeline, due to it is described cooling high pressure methane gas temperature control normal temperature compressed device temperature range
Interior, therefore, the cooling high pressure methane gas can be flowed directly into be compressed in the second level compression set 122, it is to avoid made
While with special requirement compression set, the operating efficiency of compression set is significantly improved, compressed methane gas is ultimately formed.
In the present embodiment, the multistage compressing device is respectively independent compression set, including first order compression set 121
And second level compression set 122, the 3rd extreme pressure compression apparatus can also be set as needed.
The unstability discharged in view of LNG filling stations methane gas, the heat-exchanger rig 11 passes through pipeline and surge tank 13
Connection, the surge tank 13 is used for the methane gas for receiving LNG filling stations, is collected buffering to diffusing methane gas, waits to be collected into
Inputted when a certain amount of to the heat-exchanger rig 11, so as to avoid the continuous service of system.
Illustrate the operation principle of methane gas recovery system below：
Low temperature methane gas enters to be collected in the surge tank 13, is inputted when being collected into a certain amount of to the heat exchange dress
Put in 11 first passage, the low temperature methane gas heat exchange heating forms heating methane gas, enters the first order by pipeline
In compression set 121, the heating methane gas is compressed to form HTHP methane in the first order compression set 121
Gas, the HTHP methane gas enters the heat-exchanger rig 11 by the outlet of the first order compression set 121 by pipeline
Second channel in, exchanged heat with low temperature methane gas in the first passage of the heat-exchanger rig 11, make HTHP methane gas
Temperature reduce to be formed cooling high pressure methane gas, by it is described cooling high pressure methane gas be delivered to the second level compression set 122
Inside it is compressed, ultimately forms compressed methane gas；Meanwhile, the heat exchange of low temperature methane gas rises in the first passage of the heat-exchanger rig 11
Temperature forms heating methane gas, can be fed directly in the first order compression set 122, realizes the recycling to energy.
Embodiment two：
Embodiment two is the improvement made on the basis of embodiment one, in order to improve the system for reclaiming methane gas, in reality
Apply and the structure of the multistage compressing device is improved in the system of example one, the following detailed description of：
As shown in Fig. 2 the multistage compressing device 12 is multiple compression sections of same compression set, it can wrap as needed
Include first order compression set 12A, second level compression set 12B, third level compression set etc..Compared to the independence in embodiment one
Compression set, the occupation area of equipment of the present embodiment two reduces.
In the present embodiment, the multistage compressing device 12 is a compression set, and first order compression set 12A fills for compression
The former sections of compressions put, second level compression set 12B is the rear several sections of compressions of compression set.Heating methane gas enters compression set
Afterwards, high-temperature pressurizing methane gas is drawn in some setting compression stage, specifically, the first order is compressed as described in corresponding in the stage
The methane gas is compressed to form HTHP methane gas in device 12A, methane gas is adjusted by the inlet temperature of compression set
Flow into the first passage of heat-exchanger rig 11, so that the inlet temperature of compression set is not less than the volume of compression set
Constant temperature degree.The present embodiment is realized on the premise of compression set manufacturing cost is not increased presses methane gas by compression set formation
The purpose of contracting methane gas, and finally it is delivered to follow-up other systems.
Embodiment three：
Embodiment three is the deformation made on the basis of embodiment one or embodiment two, and methane gas is reclaimed in order to improve
System, the equipment that recycling is added in the system of embodiment one or embodiment two, the following detailed description of：
As shown in figure 3, in the compressed methane gas recovery system, because initial cryogenic methane gas is entered by the surge tank 13
After entering in the first passage of the heat-exchanger rig 11, heating methane is not formed also in the second channel of the heat-exchanger rig 11
Gas, therefore the temperature of the methane gas flowed out out of the heat-exchanger rig 11 first passage is still very low, it is impossible to it is directly inputted into
In the first order compression set 12A, therefore set between the entrance and the heat-exchanger rig 11 of the first order compression set 12A
There is heating device 14, the heating device 14 is wound between the first order compression set 12A and the heat-exchanger rig 11
On pipeline, when the low temperature methane gas flowed out in the first passage from the heat-exchanger rig 11 flows into the first order compression set
During 12A entrance, after the heating by the heating device 14 so that the methane of the first order compression set 12A porch
Temperature degree is raised, and can be flowed directly into the first order compression set 12A and be carried out pressurized operation.
In order to realize the heat temperature raising by the heating device 14 to methane gas, the heating device 14 is that heat exchange type is set
It is standby, heat tracing charging aperture 141 and heat tracing discharging opening 142 are which is provided with, high-temperature medium flows into the companion by heat tracing charging aperture 141
In thermal 14, flowed out by the heat tracing discharging opening 142, so as to realize the heat exchange heating to methane gas in pipeline.Make
For one kind deformation, the heat tracing equipment 14 can also be heated type equipment, by heated type equipment to from the heat-exchanger rig 11
Pipeline between to the first order compression set 12A entrances is heated, so that the temperature rise of the methane gas.
The high-temperature medium can be water or other fluid, in order to save the energy, it is to avoid waste, from the heat tracing discharging opening 142
Outflow high-temperature medium can continue to utilize for miscellaneous equipment；The heated type equipment can be the heating of the common forms such as electrical heating
Equipment.
Example IV：
The present embodiment four is the deformation made on the basis of embodiment one or embodiment two, in order to improve recovery methane gas
System, the monitoring device for controlling gas to reclaim automatically is added in the system of example IV, the following detailed description of：
As shown in figure 4, present embodiments provide a kind of compressed methane gas recovery control system, the surge tank 13 with it is described
The Stress control for entering the heat-exchanger rig 11 provided with the methane gas controlled in the surge tank 13 between heat-exchanger rig 11 is interlocked
Provided with the control multi-stage compression between device 15 and the heat-exchanger rig 11 and the first order compression set 12A entrance
The temperature control interlock 16 that device 12 is opened and closed.
In the present embodiment, the Stress control interlock 15 controls to change described in the methane gas inflow in the surge tank 13
In thermal 11, when the outlet pressure of the surge tank 13 is more than the first preset value, methane gas flows into the heat-exchanger rig 12
It is interior；When the outlet pressure of the surge tank 13 is less than the second preset value, methane gas cannot flow into the heat-exchanger rig 12.Institute
The keying that temperature control interlock 16 controls the multistage compressing device 12 is stated, specifically, is flowed when from the heat-exchanger rig 12
When the temperature of the methane gas gone out is in setting range, start the first order compression set 12A；When the first order compression set
The cooling high pressure that the methane gas of 12A outflows is formed with the low temperature methane gas in the first passage of heat-exchanger rig 12 after heat exchange
When the temperature of methane gas is in setting range, start the second level compression set 12B, wherein the setting range of the temperature
It can ensure the normal startup of the multistage compressing device 12 when between -10 ° to 0 °.The present embodiment passes through the Stress control
Interlock 15 and the temperature control interlock 16 directly control the keying of whole system, realize automatically working, keep away
Exempted from manually operated, it is labor-saving simultaneously, organic efficiency is also greatly improved.
In the present embodiment, the Stress control interlock 15 includes controlling the methane gas in the surge tank 13 to enter institute
The first stop valve 151 and regulation methane gas for stating heat-exchanger rig 11 enter the regulating valve of the uninterrupted of heat-exchanger rig 11
152.Specifically, first stop valve 151 is arranged between the surge tank 13 and the heat-exchanger rig 11, the regulating valve
152 are arranged between first stop valve 151 and the heat-exchanger rig 11.The Stress control interlock 15 is provided with pressure
High-value and pressure low-value, the wherein scope of pressure high-value in 0.5Mpa between 0.7Mpa, pressure described in prioritizing selection
High-value is 0.6Mpa, the scope of the pressure low-value in 0.1Mpa between 0.3Mpa, pressure low level described in prioritizing selection
It is worth for 0.2Mpa, if the pressure that the surge tank 13 is exported is higher than the pressure high-value, starts first stop valve 151
With the regulating valve 152, the methane gas in the surge tank 13 is flowed into the heat-exchanger rig 11, according to the heat-exchanger rig 11
The temperature of outlet controls the regulating valve 152, and the regulating valve 152 opens aperture and ensure that compression set minimum load
Flow；If the pressure that the surge tank 13 is exported is less than the pressure low-value, first stop valve 151 is closed, makes first
Alkane gas stops entering in the heat-exchanger rig 11, the multistage compressing device 12 is closed at, so as to ensure system as far as possible one
Secondary run time is longer, it is to avoid frequently open.
In the present embodiment, the temperature control interlock 16 is according to being adjusted the outlet temperature of the heat-exchanger rig 11
Regulating valve 152, if the outlet temperature of the heat-exchanger rig 11 is higher than the rated temperature value of the multistage compressing device 12, as described
When the outlet temperature of heat-exchanger rig 11 is higher than 0 °, then the regulating valve 152 is tuned up, low temperature methane gas is entered the heat-exchanger rig
11 flow increases, so as to ensure the outlet temperature of the heat-exchanger rig 11 between -10 ° to 0 °；If temperature is less than described more
The rated temperature value of level compression set 12, when the outlet temperature of heat-exchanger rig 11 is less than -10 ° as described, then turns the regulation down
Valve 152, reduces the flow that low temperature methane gas enters the heat-exchanger rig 11, so as to ensure the outlet temperature of the heat-exchanger rig 11
Degree is between -10 ° to 0 °.
Embodiment five
The present embodiment five is the deformation made on the basis of example IV, in order to improve the system for reclaiming methane gas,
The monitoring device for controlling gas to reclaim automatically is added in the system of example IV, the following detailed description of：
As shown in figure 5, being provided with heating device between the entrance and the heat-exchanger rig 11 of the first order compression set 12A
14, the heating device 14 is wound on the pipeline between the first order compression set 12A and the heat-exchanger rig 11, its
In, the heating device 14 is heat exchange type equipment, which is provided with heat tracing charging aperture 141 and heat tracing discharging opening 142, high-temperature medium
Flowed into the heating device 14, flowed out by the heat tracing discharging opening 142, so as to realize by heat tracing charging aperture 141
Heat exchange heating to methane gas in pipeline.
In order to automatically control the keying of the heating device 14, the heat tracing charging 141 of the heating device 14 is provided with the
Two stop valves 143, for controlling the medium of the heat tracing charging aperture 141 to flow into the heating device 14, when the heat exchange dress
The temperature for putting the methane gas of 11 outlets is less than the rated temperature value of the multistage compressing device 12, and heat-exchanger rig 11 goes out as described
When mouth temperature is less than -10 °, second stop valve 143 is opened, the medium of the heat tracing charging aperture 141 is flowed into the heat tracing
In device 14, the methane gas in the exit of heat-exchanger rig 11 is set to heat up；When the temperature for the methane gas that the heat-exchanger rig 11 is exported
Degree is higher than the rated temperature value of the multistage compressing device 12, and the outlet temperature of heat-exchanger rig 11 is between -10 ° to 0 ° as described
When, second stop valve 143 is closed, the multistage compressing device 12 is opened.
As one kind deformation, the heat tracing equipment 14 can also be heated type equipment, by heated type equipment to from described
Heat-exchanger rig 11 to the pipeline between the first order compression set 12A entrances is heated, so that the methane gas
Temperature is raised.
Embodiment six：
The present embodiment provides a kind of compressed methane gas recovery method, is appointed using embodiment one, embodiment two, embodiment three
Compressed methane recovery system described in meaning one reclaims methane gas, and it specifically includes following steps：
Step S1：Methane gas heat exchange heating is formed into heating methane gas；Step S2：It will heat up methane gas and be pressed to form high temperature
High pressure methane gas；Step S3：Methane gas in HTHP methane gas and the step S1 is subjected to heat exchange cooling and forms cooling
High pressure methane gas；Step S4：Will cooling high pressure methane gas repressurization formation compressed methane gas.
In compressed methane gas recovery method described in the present embodiment, the step S1, the methane gas of low-temp low-pressure is exchanged heat and risen
Temperature forms heating low-pressure methane gas；In the step S2, it will heat up low-pressure methane gas and be pressed to form HTHP methane gas；It is described
In step S3, the low-temp low-pressure methane gas in HTHP methane gas and the step S1 is subjected to heat exchange cooling formation cooling high
Methane gas is pressed, and makes the low-temp low-pressure methane gas in the step S1 heat up to form heating methane gas, since the step S2
Circulation, due to using making low-temp low-pressure methane gas heat up to be formed heating methane gas the step of compression, and it is low with low temperature before compression
Press methane gas to carry out heat exchange cooling, eliminate the heat exchange of other media, therefore be effectively saved energy；Meanwhile, make low-temp low-pressure
The step of directly being pressurizeed is realized in methane gas heating, and makes the HTHP methane gas cooling of the step S2 realize directly to enter
The step of row pressurization, therefore significantly improve operating efficiency；In the step S4, will cooling high pressure methane gas repressurization so as to
Form compressed methane gas.
In the present embodiment, before the step S1, in addition to the step of methane gas is collected into buffering, it is contemplated that LNG
The unstability of filling station methane gas release, is collected buffering to diffusing methane gas, institute is entered back into when being collected into a certain amount of
State in step S1, so as to avoid the continuous service of system.
, can be with order to realize the step of heat exchange heating of low-temp low-pressure methane gas is formed into heating methane gas in the step S1
The purpose that heating is realized in heat exchange is carried out to methane gas by the heat tracing equipment 14.
Embodiment seven：
The present embodiment provides a kind of compressed methane gas recycling and control method, is reclaimed using the compressed methane described in example IV
Control system reclaims methane gas, and it specifically includes following steps：
Step S1：The methane gas that will be reclaimed is collected buffering by surge tank 13, judges the surge tank 13
The size of outlet pressure and preset pressure value, when the outlet pressure of the surge tank 13 is higher than the first preset value, into step
S2；When the outlet pressure of the surge tank 13 is less than the second preset value, continue to collect methane gas going out to the surge tank 13
Mouth pressure is higher than the first preset value, into step S2；Step S2：Methane gas heat exchange heating is formed into heating methane gas, judges to rise
Whether the temperature of warm methane gas is in setting range, if the temperature of heating methane gas is in setting range, into step S3；If rising
The temperature of warm methane gas is not in setting range, and the temperature for being warming up to heating methane gas that continues to exchange heat to methane gas is in setting range
It is interior, into step S3；Step S3：It will heat up methane gas and be pressed to form HTHP methane gas；Step S4：By HTHP methane
Gas carries out heat exchange cooling with the methane gas in the step S1 and forms cooling high pressure methane gas；Step S5：To be cooled high pressure methane
Gas repressurization formation compressed methane gas.
In methane gas recycling and control method described in the present embodiment, in the step S1,15 controls are filled using Stress control interlocking
The methane gas made in the surge tank 11 enters the heat-exchanger rig 11, when the outlet pressure of the surge tank 13 is pre- higher than first
If during value, specifically, if the pressure that the surge tank 13 is exported is higher than the pressure high-value, starting first stop valve
151 and the regulating valve 152, the methane gas in the surge tank 13 is flowed into the heat-exchanger rig 11, into step S2；Work as institute
When the outlet pressure for stating surge tank 13 is less than the second preset value, specifically, if the pressure that the surge tank 13 is exported is less than described
Pressure low-value, then close first stop valve 151, and is closed at the multistage compressing device 12, stops methane gas
Into in the heat-exchanger rig 11, continue to collect methane gas to the outlet pressure of the surge tank 13 higher than pressure high-value, first
Alkane gas flows into the heat-exchanger rig 11, into step S2.In the step S2, judged using the temperature control interlock 16
Whether the temperature for the methane gas that heats up is in setting range, if the temperature of heating methane gas is in setting range, such as heating methane gas
Temperature between -10 ° to 0 °, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue to methane gas
Heat exchange is warming up to the temperature of heating methane gas in setting range, into step S3.In the step S3, it will heat up methane gas and add
Swaging is into HTHP methane gas.In the step S4, the methane gas in HTHP methane gas and the step S1 is carried out
Heat exchange cooling forms cooling high pressure methane gas, into step S5, and makes the methane gas in the step S1 heat up to form heating first
Alkane gas, is started the cycle over from the step S3.The step of step S4 includes judging the heating methane gas temperature, if heating
The temperature of methane gas is in setting range, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue to first
The heat exchange of alkane gas is warming up to the temperature of heating methane gas in setting range, into step S3, specifically, if the temperature of heating methane gas
Degree is not in setting range, by adjusting methane gas into the temperature for being sized so that heating methane gas of the flow of heat-exchanger rig 11
Degree is in setting range.In this step, the methane gas in step S1 is not only set to heat up, and make the HTHP first in step S4
Alkane gas is cooled, it is achieved that the recycling of energy, fully saves the energy, significantly improves capacity usage ratio, so as to have
Effect reduces the floor space of equipment.In the step S5, by cooling high pressure methane gas repressurization formation compressed methane gas, this reality
Example is applied by interlocked control so as to realize that the automatic safe of equipment is run, while effectively reducing human cost.
Embodiment eight：
The present embodiment provides a kind of methane gas recycling and control method, is reclaimed and controlled using the compressed methane gas described in embodiment five
System processed reclaims methane gas, and the place different from methane gas recycling and control method described in embodiment seven is step S2, below in detail
Describe in detail bright：
In step S2 described in the present embodiment, methane gas heat exchange heating is formed into heating methane gas, heating methane gas is judged
Whether temperature is in setting range, if the temperature of heating methane gas is in setting range, into step S3；If the methane gas that heats up
Temperature continues to exchange heat to methane gas the temperature for being warming up to heating methane gas in setting range, into step not in setting range
Rapid S3, because the temperature of initial methane gas is very low, it is impossible to be directly entered in the step S3, by the companion for opening heat tracing equipment 14
The second stop valve 143 in hot feed mouthful 141 can form heating methane gas to methane gas heat exchange heating, and judge the methane that heats up
Whether the temperature of gas is in setting range, if the temperature of heating methane gas closes second stop valve in setting range
143, start the first order compression set 12A, into step S3；If the temperature for the methane gas that heats up is not in setting range, after
The continuous temperature for being warming up to heating methane gas that exchanged heat to methane gas is in setting range, into step S3.
Compression set of the present invention can be compressor, and the heat-exchanger rig is heat exchanger；From multi-stage compression dress
Putting the 12 compressed methane gas finally discharged can directly utilize, and can also be stored in methane and deposit in tank.
To sum up, above technical scheme of the present invention has advantages below：
1. compressed methane gas recovery control system of the present invention, the Stress control interlock controls the surge tank
Interior methane gas is flowed into the heat-exchanger rig, when the outlet pressure of the surge tank is more than the first preset value, methane gas stream
Enter in the heat-exchanger rig；When the outlet pressure of the surge tank is less than the second preset value, methane gas cannot flow into described change
In thermal.The temperature control interlock controls the keying of the multistage compressing device.The present invention passes through the pressure control
Interlock processed and the temperature control interlock directly control the keying of whole system, realize automatically working, it is to avoid
Manually operated, it is labor-saving simultaneously, be also greatly improved organic efficiency.
2. compressed methane gas recovery control system of the present invention, the temperature control interlock is filled according to the heat exchange
The outlet temperature put adjusts the regulating valve, if the outlet temperature of the heat-exchanger rig is specified higher than the multistage compressing device
Temperature value, increases the flow that methane gas enters the heat-exchanger rig；If temperature is less than the specified temperature of the multistage compressing device
Angle value, reduces the flow that methane gas enters the heat-exchanger rig.
3. compressed methane gas recovery control system of the present invention, the entrance of the first order compression set and the heat exchange
Heating device is provided between device, the heating device is wound between the first order compression set and the heat-exchanger rig
On pipeline, wherein, the heating device is heat exchange type equipment, which is provided with heat tracing charging aperture and heat tracing discharging opening, and high temperature is situated between
Matter is flowed into the heating device by heat tracing charging aperture, is flowed out by the heat tracing discharging opening, so as to realize to pipeline
The heat exchange heating of interior methane gas.
4. it is described slow using Stress control interlocking dress control in methane gas recycling and control method of the present invention, the step S1
The methane gas rushed in tank enters the heat-exchanger rig, when the outlet pressure of the surge tank is higher than the first preset value, starts institute
The methane gas stated in the first stop valve and the regulating valve, the surge tank is flowed into the heat-exchanger rig, into step S2；When
When the outlet pressure of the surge tank is less than the second preset value, first stop valve is closed, and be closed at the multistage pressure
Compression apparatus, makes methane gas stop entering in the heat-exchanger rig, continues to collect methane gas to the outlet pressure height of the surge tank
Untill pressure high-value, methane gas flows into the heat-exchanger rig, into step S2.In the step S2, the temperature is utilized
Control interlock judges the temperature of heating methane gas whether in setting range, if the temperature of heating methane gas is in setting range
It is interior, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue to be warming up to heating methane to methane gas heat exchange
The temperature of gas is in setting range, into step S3.In the step S3, it will heat up methane gas and be pressed to form HTHP methane
Gas.In the step S4, the methane gas in HTHP methane gas and the step S1 is subjected to heat exchange cooling formation cooling high
Methane gas is pressed, into step S5, and makes the methane gas in the step S1 heat up to form heating methane gas, is opened from the step S3
Begin to circulate.In this step, the methane gas in step S1 is heated up, and carry out the HTHP methane gas in step S4
Cooling, it is achieved that the recycling of energy, fully saves the energy, significantly improves capacity usage ratio, is set so as to effectively reduce
Standby floor space.In the step S5, by cooling high pressure methane gas repressurization formation compressed methane gas, the present embodiment passes through
Interlocked control is so as to realize the automatic safe operation of equipment, while effectively reducing human cost.
5. in methane gas recycling and control method of the present invention, the step S2, entered by the heat tracing for opening heat tracing equipment
The second stop valve in material mouth can form heating methane gas to methane gas heat exchange heating, and the temperature for the methane gas that judges to heat up is
It is no in setting range, if the temperature of heating methane gas closes second stop valve in setting range, start described first
Level compression set, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue to be warming up to methane gas heat exchange
The temperature for the methane gas that heats up is in setting range, into step S3.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of embodiment.For
For those of ordinary skill in the art, other various forms of changes or change can also be made on the basis of the above description
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change or change thus extended out
Move still in the protection domain of the invention.
Claims (10)
1. a kind of compressed methane gas recovery control system, including delay for receiving the surge tank of the methane gas, and with described
The heat-exchanger rig that tank is connected is rushed, the heat-exchanger rig at least includes two passages, it is characterised in that：The compressed methane gas is returned
Receipts system also includes the multistage compressing device being connected with the heat-exchanger rig, and the entrance of wherein first order compression set passes through pipe
Road is connected with the first passage of the heat-exchanger rig, and the outlet of the first order compression set is filled by pipeline with the heat exchange
The second channel put is connected, and the second channel of the heat-exchanger rig is connected with the entrance of second level compression set by pipeline
Connect, enter the heat-exchanger rig provided with the methane gas controlled in the surge tank between the surge tank and the heat-exchanger rig
Provided with the control multistage between the entrance of Stress control interlock and the heat-exchanger rig and the one stage of compression device
The temperature control interlock that compression set is opened and closed.
2. compressed methane gas recovery control system according to claim 1, it is characterised in that：The Stress control interlocking dress
Put and enter including the first stop valve and regulation methane gas for controlling the methane gas in the surge tank to enter the heat-exchanger rig
The regulating valve of the heat-exchanger rig flow.
3. compressed methane gas recovery control system according to claim 2, it is characterised in that：The Stress control interlocking dress
Pressure high-value and pressure low-value have been installed, if the pressure of surge tank outlet is higher than the pressure high-value, has been started
First stop valve and the regulating valve；If the pressure of the surge tank outlet is less than the pressure low-value, institute is closed
State the first stop valve and the multistage compressing device.
4. compressed methane gas recovery control system according to claim 2, it is characterised in that：The temperature control interlocking dress
Put and the regulating valve is adjusted according to the outlet temperature of the heat-exchanger rig, if the outlet temperature of the heat-exchanger rig is higher than specified
Value, then tune up the regulating valve, increases the flow that methane gas enters the heat-exchanger rig；If the outlet temperature of the heat-exchanger rig
Degree is less than rated value, then turns the regulating valve down, reduces the flow that methane gas enters the heat-exchanger rig.
5. compressed methane gas recovery control system according to claim 1, it is characterised in that：The one stage of compression device
Heating device is provided between entrance and the heat-exchanger rig, the heating device is wound in the one stage of compression device and changed with described
On pipeline between thermal.
6. compressed methane gas recovery control system according to claim 5, it is characterised in that：The heat tracing of the heating device
Charging aperture is provided with the second stop valve.
7. a kind of compressed methane gas recycling and control method, its step is as follows, including：
Step S1：The methane gas that will be reclaimed is collected buffering by surge tank, judges the outlet pressure of the surge tank
With the size of preset pressure value, when the surge tank outlet pressure be higher than the first preset value when, into step S2；When described slow
When the outlet pressure for rushing tank is less than the second preset value, the outlet pressure for continuing collection methane gas to the surge tank is pre- higher than first
If value, into step S2；
Step S2：Methane gas heat exchange heating is formed into heating methane gas, judges the temperature of heating methane gas whether in setting range
It is interior, if the temperature of heating methane gas is in setting range, into step S3；If the temperature for the methane gas that heats up is not in setting range
It is interior, continue to exchange heat to methane gas the temperature for being warming up to heating methane gas in setting range, into step S3；
Step S3：It will heat up methane gas and be pressed to form HTHP methane gas；
Step S4：Methane gas in HTHP methane gas and the step S1 is subjected to heat exchange cooling and forms cooling high pressure methane
Gas；
Step S5：Will cooling high pressure methane gas repressurization formation compressed methane gas.
8. compressed methane gas recycling and control method according to claim 7, it is characterised in that：In the step S2, pass through
The second stop valve opened on the heat tracing charging aperture of heat tracing equipment forms heating methane gas to methane gas heat exchange heating, judges heating
Whether the temperature of methane gas is in setting range, if the temperature of heating methane gas is in setting range, closes second cut-out
Valve, into step S3；If the temperature for the methane gas that heats up is not in setting range, continue to be warming up to heating methane to methane gas heat exchange
The temperature of gas is in setting range, into step S3.
9. compressed methane gas recycling and control method according to claim 7, it is characterised in that：The step S4 includes sentencing
The step of disconnected heating methane gas temperature, if the temperature of heating methane gas is in setting range, into step S3；If heating up first
The temperature of alkane gas continues to exchange heat to methane gas the temperature for being warming up to heating methane gas in setting range not in setting range,
Into step S3.
10. compressed methane gas recycling and control method according to claim 9, it is characterised in that：In the step S4, if rising
The temperature of warm methane gas is sized so that heating methane not in setting range by adjusting methane gas into heat-exchanger rig flow
The temperature of gas is in setting range.
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| CN104141881A (en) * | 2014-07-18 | 2014-11-12 | 江汉石油钻头股份有限公司 | Heat transfer system utilizing normal temperature compressor to compress cryogenic medium |
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| CN104141881A (en) * | 2014-07-18 | 2014-11-12 | 江汉石油钻头股份有限公司 | Heat transfer system utilizing normal temperature compressor to compress cryogenic medium |
| CN204062465U (en) * | 2014-07-18 | 2014-12-31 | 天津舜天达天然气有限公司 | A kind of flashed vapour recovering device |
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