CN106640246B - A kind of safety operation control that natural gas pipe network pressure energy utilizes realization system and method - Google Patents
A kind of safety operation control that natural gas pipe network pressure energy utilizes realization system and method Download PDFInfo
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- CN106640246B CN106640246B CN201611087545.6A CN201611087545A CN106640246B CN 106640246 B CN106640246 B CN 106640246B CN 201611087545 A CN201611087545 A CN 201611087545A CN 106640246 B CN106640246 B CN 106640246B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
Abstract
The present invention provides a kind of safety operation controls that natural gas pipe network pressure energy utilizes to realize that system and method, system include：Expansion power generation module is converted into electric energy for being depressured to the high-pressure natural gas flowed out from high-voltage fence, and by obtained pressure energy is depressured；Cryogenic natural gas cold energy use module, for supply cold energy of the cryogenic natural gas after expanding expanded electricity generation module after exchanging heat with refrigerant；Monitoring regulation and control module; for monitoring expansion power generation module in real time; when monitoring expansion power generation module emergency shutdown or natural gas power load drop suddenly, then expansion power generation module is switched into preset voltage-regulating system, and the rear end pressure of expansion power generation module is supplemented to front end.The present invention realizes the slitless connection of pressure energy expansion power generation system and original voltage-regulating system, successfully manages the impact of burst operating mode, improves expanding machine and runs service life, ensures whole system safe and stable operation.
Description
Technical field
The present invention relates to natural gas overbottom pressure complementary energy utilization technology field more particularly to a kind of natural gas pipe network pressure energies
The safety operation control utilized realizes system and method.
Background technology
Long-distance Transmission Pipeline generally uses high-pressure delivery, the distribution pressure difference of such as transfering natural gas from the west to the east " line " and " two wires "
The partial pressure need to often be reduced by pressure reducing valve, can be produced in the process before being delivered to user terminal for 10MPa and 12MPa
Raw a large amount of pressure energy.Such as：When gas distributing system pressure is 4MPa, the pressure of terminal user is 1.6MPa, which is pressed
Power can be used to generate electricity, then be about 12W per the recyclable electric energy of square gas, calculated for 120 billion cubic meters according to " line " year displacement,
Then annual recyclable pressure energy is 1.32 hundred million kW, 633,600,000,000 yuan of direct economic loss.It is energy saving in order to reduce the wasting of resources,
The utilization of partial pressure energy has attracted people's attention.
Chinese patent CN105401990A describes a kind of intelligent natural gas pipe network pressure energy power generator.The practicality is new
Type patent by pressure energy electricity generation system and energy-storage system distribute rationally and intelligentized control method is, it can be achieved that system passive starts,
One key opens and closes, automatic adjustment and teletransmission manipulate, suitable for having power demand, unattended remote districts.Chinese patent
CN203430574U describes a kind of device to generate electricity using mini gas pipe network pressure energy.The utility model patent passes through close
The system reform is sealed, fluid motor is applied into natural gas pipe network pressure energy power generation, it is steady that standard can be provided for 1-5kW small-power users
Determine power supply.Chinese patent CN102563958A describes a kind of method and apparatus using pipe network pressure energy power generation and ice making, should
Invention is by natural gas pipe network pressure energy for generating electricity, and cryogenic natural gas cold energy is passed through ice-making system system after institute's electricity and pressure regulation
Ice, realization natural gas pipe network pressure energy and cold energy make full use of.Chinese patent CN204960996U describes a kind of natural gas
Pipe network pressure energy automatic control electricity generation system.The utility model patent is combined using technologies such as electric power storage, inversion, automatic control, current limlitings ensures system
Electrical power stabilization of uniting supply solves the problems, such as that combustion gas fluctuation causes electric power output unstable.Chinese patent CN205025513U provides one
Kind natural gas pipe network pressure energy recycles utilization system, which passes through the combination of heat pump system and compound expansion system, increases
While adding generated energy, solve the problems, such as that expanding machine preheating is risen again with cryogenic natural gas after pressure regulation.Chinese patent
CN101245956A provides a kind of method using pressure energy of natural gas, which uses unpowered refrigeration machine by pressure
Cold energy can be converted into and be sequentially applied to freezer, ice making, air conditioner user.
Above-mentioned patent proposes the recycling mode of natural gas pipe network pressure energy, and partial monopoly utilizes system to pressure energy
The stable manipulation of system and product are stablized output and are inquired into.However, in natural gas pipe network pressure energy recycling system, exist
It promptly stops the supple of gas or steam or the special operation conditions such as load of electrical generation is reduced has the problems such as impact loss to key equipment expanding machine, eventually lead to swollen
Swollen machine damage, influence downstream natural gas supply system stablizes output.
Therefore, the prior art could be improved and develop.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of natural gas pipe network pressure energy profits
Safety operation control realizes system and method, and recycling natural gas pipe network pressure energy is for generating electricity, and cryogenic natural gas is available after pressure regulation
In for systems such as dry ice, freezer, ice making or cooling water air conditioners.It is important that in the process of running, by monitoring regulation and control and system
Linkage design, ensures the slitless connection of expansion power generation system and original voltage-regulating system, protects expanding machine rushing from burst operating mode
It hits, realizes the safety and stability of combustion gas process system.
In order to achieve the above object, this invention takes following technical schemes：
A kind of safety operation control that natural gas pipe network pressure energy utilizes realization system, wherein including：
Expansion power generation module is obtained for being depressured to the high-pressure natural gas flowed out from high-voltage fence, and by decompression
Pressure energy be converted into electric energy；
Cryogenic natural gas cold energy use module, for the cryogenic natural gas warp and refrigerant after expanding expanded electricity generation module
Supply cold energy after heat exchange；
Monitoring regulation and control module, for monitoring expansion power generation module in real time, when monitor expansion power generation module emergency shutdown or
When the steep drop of natural gas power load, then expansion power generation module is switched into preset voltage-regulating system, and by expansion power generation module
End pressure is supplemented to front end afterwards.
Safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the expansion power generation module includes
It is connected to the expanding machine (6) between high pressure pipe network and low-pressure pipe network in turn by pipeline, the output shaft of expanding machine (6) is sequentially connected
Shaft coupling (7) and generator (9), the output power of generator (9) are exported by cable；It is natural after expanded machine (6) decompression
Gas enters cryogenic natural gas cold energy use module after being adjusted by temperature and pressure balancer (12).
The safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the cryogenic natural gas cold energy profit
Include heat exchanger (16) with module and is connected with device for cooling (17), one end of the heat exchanger (16) and the temperature and pressure balancer (12)
It connects, the other end is connect with described with device for cooling (17).
The safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the monitoring regulates and controls module and includes：
The first shut-off valve (1), the first electricity being successively set between high pressure pipe network and the air inlet of expanding machine (6) on pipeline
Magnet valve (2), electric control valve (3), the first temperature transmitter (4), first pressure transmitter (5)；
The rotating speed transducer (8) connected on the shaft coupling (7)；
The second solenoid valve that the branch road being connected between electric control valve (3) and temperature and pressure balancer (12) is set gradually
(10) and the first check valve (11)；
The sequentially connected second temperature transmitter (13) in branch road between temperature and pressure balancer (12) and heat exchanger (16),
Second pressure transmitter (14) and the second shut-off valve (15)；
Sequentially connected third shut-off valve (18), third temperature transmitter in the branch of heat exchanger (16) and downstream pipe network road
(19), third pressure transmitter (20), the second check valve (21), safety valve (22) and the 4th shut-off valve (23)；
The third solenoid valve (24) and pressure regulator set gradually on branch road between high pressure pipe network and low-pressure pipe network
(25)。
The safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the expanding machine (6) is that turbine is swollen
Swollen machine or screw expander.
Safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the temperature and pressure balancer (12) is
Deicing silk screen is arranged in the compensator of 20-50L, compensator inside.
Safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the electric control valve (3) with turn
Fast transmitter (8) is linked, and when expanding machine (6) rotating speed is more than preset maximum speed, electric control valve (3) aperture subtracts
It is small；When expanding machine (6) rotating speed is less than preset lower limit rotating speed, electric control valve (3) aperture increases.
Safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein first solenoid valve (2), the
Two solenoid valves (10) and third solenoid valve (24) link, when the first solenoid valve (2) are opened, second solenoid valve (10) and
Three solenoid valves (24) are in off state；When the first solenoid valve (2) are closed, second solenoid valve (10) and third solenoid valve (24)
It is open state.
The safety operation control that the natural gas pipe network pressure energy utilizes realizes system, wherein the heat exchanger (16) is shell
Formula heat exchanger.
A kind of safety operation control implementation method that natural gas pipe network pressure energy utilizes, wherein the described method comprises the following steps：
Expansion power generation module is depressured the high-pressure natural gas flowed out from high-voltage fence, and will be depressured obtained pressure
Electric energy can be converted into；
Cryogenic natural gas after cryogenic natural gas cold energy use module expands expanded electricity generation module passes through and refrigerant heat exchange
Supply cold energy afterwards；
Monitoring regulation and control module monitors expansion power generation module in real time, when monitoring expansion power generation module emergency shutdown or natural gas
When load of electrical generation drops suddenly, then expansion power generation module is switched into preset voltage-regulating system, and by the rear side pressure of expansion power generation module
Power is supplemented to front end.
The safety operation control that natural gas pipe network pressure energy provided by the present invention utilizes realizes that system and method, system include：
Expansion power generation module for being depressured to the high-pressure natural gas flowed out from high-voltage fence, and will be depressured obtained pressure energy
It is converted into electric energy；Cryogenic natural gas cold energy use module, for by expanded electricity generation module expand after cryogenic natural gas pass through with
Supply cold energy after refrigerant heat exchange；Monitoring regulation and control module, for monitoring expansion power generation module in real time, when monitoring expansion power generation mould
When block emergency shutdown or natural gas power load are dropped suddenly, then expansion power generation module is switched into preset voltage-regulating system, and will be swollen
The rear end pressure of swollen electricity generation module is supplemented to front end.The present invention realizes the nothing of pressure energy expansion power generation system and original voltage-regulating system
Seam docking, successfully manages the impact of burst operating mode, improves expanding machine and runs service life, ensures whole system safety and stability fortune
Row.
Description of the drawings
Fig. 1 is the structure diagram that the safety operation control that natural gas pipe network pressure energy of the present invention utilizes realizes system.
Fig. 2 is the structural schematic diagram that the safety operation control that natural gas pipe network pressure energy of the present invention utilizes realizes system.
Wherein, it is shown in Fig. 2：The first shut-off valves of 1-；The first solenoid valves of 2-；3- electric control valves；The first temperature of 4- becomes
Send device；5- first pressure transmitters；6- expanding machines；7- shaft couplings；8- rotating speed transducers；9- generators；10- second solenoid valves；
The first check valves of 11-；12- temperature and pressure balancers；13- second temperature speed changers；14- second pressure transmitters；15- second ends
Valve；16- heat exchangers；17- device for cooling；18- third shut-off valves；19- third temperature transmitters；20- third pressure transmitters；
21- check valves；22- safety valves；The 4th shut-off valves of 23-；24- third solenoid valves；The original pressure regulators of 25-.
Fig. 3 is the flow chart that the safety operation control that natural gas pipe network pressure energy of the present invention utilizes realizes systems approach.
Specific implementation mode
The present invention provides a kind of safety operation control that natural gas pipe network pressure energy utilizes realization system and method, to make the present invention
Purpose, technical solution and effect it is clearer, clear, the embodiment that develops simultaneously referring to the drawings to the present invention further specifically
It is bright.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
The safety operation control that natural gas pipe network pressure energy of the present invention utilizes realizes system, as shown in Figure 1 comprising：
Expansion power generation module 100 is obtained for being depressured to the high-pressure natural gas flowed out from high-voltage fence, and by decompression
The pressure energy obtained is converted into electric energy；
Cryogenic natural gas cold energy use module 200, for by expanded electricity generation module expand after cryogenic natural gas pass through with
Supply cold energy after refrigerant heat exchange；
Monitoring regulation and control module 300, for monitoring expansion power generation module in real time, when monitoring expansion power generation module emergency shutdown
Or when the steep drop of natural gas power load, then expansion power generation module is switched into preset voltage-regulating system, and by expansion power generation module
Rear end pressure be supplemented to front end；
The expansion power generation module 100 is separately connected cryogenic natural gas cold energy use module 200 and monitoring regulation and control module
300。
Specifically, as shown in Fig. 2, expansion power generation module includes being connected to high pressure pipe network and low-pressure pipe network in turn by pipeline
Between expanding machine 6, the output shaft of expanding machine 6 is sequentially connected shaft coupling 7 and generator 9, and 9 output power of generator passes through cable
Output；Natural gas after pressure regulation enters heat exchanger 16 after being adjusted by temperature and pressure balancer 12.
Cryogenic natural gas cold energy use module includes the heat exchanger by natural gas and heat exchange refrigerant heat exchange after adjusting
16 and with device for cooling 17.
Monitoring regulation and control module includes first be successively set between high pressure pipe network and turbo-expander air inlet on pipeline
Shut-off valve 1, the first solenoid valve 2, electric control valve 3, the first temperature transmitter 4, first pressure transmitter 5；In the shaft coupling 7
The rotating speed transducer 8 of upper connection；Second is set gradually on the branch road being connected between electric control valve 3 and temperature and pressure balancer 12
Solenoid valve 10 and the first check valve 11；Second temperature change is sequentially connected on branch road between temperature and pressure balancer 12 and heat exchanger 16
Send device 13, second pressure transmitter 14 and the second shut-off valve 15；It is sequentially connected on branch road of the heat exchanger 16 with downstream pipe network
Third shut-off valve 18, third temperature transmitter 19, third pressure transmitter 20, the second check valve 21, safety valve 22 and the 4th section
The third solenoid valve 24 and pressure regulator 25 only set gradually on branch road of the valve 23 between high pressure pipe network and low-pressure pipe network.
As the preferred embodiment in this implementation, expanding machine 6 is preferably turbo-expander or screw expander；Shaft coupling
7 be preferably yielding coupling；Generator 8 is preferably asynchronous generator, has explosion prevention function；Temperature and pressure balancer 12 is preferably 20-
The compensator of 50L, compensator inside are arranged deicing silk screen, remove the ice formed in minor amount of water pressure reduction in cryogenic natural gas,
Ensure downstream pipe network and equipment safety；Heat exchanger 16 is preferably shell-and-tube heat exchanger, and cryogenic natural gas walks tube side, and refrigerant walks shell
Journey, to be transferred to cryogenic natural gas cold energy with device for cooling 17；With 17 preferred freezer of device for cooling, ice making or cooling water air conditioner system
System, corresponding refrigerant is respectively R404A, glycol water or brine, water.
First shut-off valve 1 and the 4th shut-off valve 23 are independent by natural gas expansion system and original voltage-regulating system；First
Shut-off valve 1, the second shut-off valve 15 and third shut-off valve 18 can be independent from system by expansion power generation device and heat-exchanger rig respectively
Out；First temperature transmitter 4, first pressure transmitter 5, second temperature transmitter 13, second pressure transmitter 14 and third
Temperature transmitter 19, third pressure transmitter 20 are respectively by cryogenic natural gas after high-pressure natural gas, pressure regulation and low after heat exchange
Warm natural gas carries out temperature, pressure metering；First check valve 11 is with the second check valve 21 so that natural gas can not flow back；Safety valve
22 under the excessively high situation of ductwork pressure pressure release with ensure system safety.
Electric control valve 3 is linked system with rotating speed speed changer 8, and when rotating speed is excessive, 3 aperture of electric control valve reduces,
So that gas discharge reduces, 6 rotating speed of expanding machine reduces；When rotating speed is too small, motorized adjustment valve opening 3 increases so that natural
Throughput increases, and 6 rotating speed of expanding machine improves.Ensure the normal table of pressure regulation process.
First solenoid valve 2, second solenoid valve 10 and third solenoid valve 24 are linked system, when the first solenoid valve 2 is opened,
Second solenoid valve 10 and third solenoid valve 24 are in off state；When the first solenoid valve 2 is closed, second solenoid valve 10 and third
Solenoid valve 24 is open state.The design of the linked system can be effectively ensured expanding machine 6 and cope with various emergency situations.
Compared with prior art, technical scheme of the present invention has advantageous effect below：
1) safety and stability for realizing expansion power generation system, ensure downstream combustion gas stablizes output.In existing expansion power generation skill
Under art, in the case where natural gas is promptly stopped the supple of gas or steam and load of electrical generation reduces, expanding machine can be caused directly to damage, influence it and use the longevity
Life.The present invention designs the slitless connection, it can be achieved that natural gas expansion system and original voltage-regulating system by three electromagnetic valve linkings,
Ensure gas downstream gas demand.Simultaneously will in emergency circumstances end pressure drainage is supplemented to front end after expanding machine, to ensure
The slow reduction of speed of expanding machine effectively solves expanding machine caused by the unexpected locking of expander system under emergency work condition and damages.
2) capacity usage ratio is high.Natural gas recycling system is substituted into original voltage-regulating system, can effectively be recycled in vain
The pressure energy of waste exchanges heat with refrigerant in heat exchanger for generating electricity, while by the cryogenic natural gas after expansion cooling, recycles the portion
Point cold energy is used to colod-application family, take full advantage of natural gas pipe network pressure energy, effectively increase system capacity utilization rate.
3) it is simple for process it is easily-controllable, electricity generation system is safe and reliable.The present invention is mainly by expanding machine electricity generation system, cryogenic natural gas
Heat-exchange system and monitoring regulator control system composition, simple for process, generated energy can be adjusted according to user demand.Robot control system(RCS) ensures a whole set of
Technique quick metering controls so that system is safe and reliable.
4) use easy to spread.Present invention process can realize power generation and refrigeration comprehensive utilization, and technological process is simple, sends out
Electric power is used or is generated electricity for airfield equipment and surfs the Internet, and refrigeration product can be used for periphery with cold market nearby.Cold obtained also may be used
For other purposes, such as dry ice processed, power generation.The technique can have power demand or without power grid remote districts build, can have
Effect saves electric energy, reduces power grid construction investment, has good economic and social benefits.
Based on above system embodiment, the present invention also provides a kind of realizations of safety operation control that natural gas pipe network pressure energy utilizes
Method, as shown in figure 3, the safety operation control implementation method that the natural gas pipe network pressure energy utilizes includes the following steps：
Step S100, expansion power generation module is depressured the high-pressure natural gas flowed out from high-voltage fence, and will be depressured institute
The pressure energy of acquisition is converted into electric energy；
Step S200, cryogenic natural gas cold energy use module by expanded electricity generation module expand after cryogenic natural gas pass through with
Supply cold energy after refrigerant heat exchange；
Step S300, monitoring regulation and control module monitors expansion power generation module in real time, promptly stops when monitoring expansion power generation module
When machine or the steep drop of natural gas power load, then expansion power generation module is switched into preset voltage-regulating system, and by expansion power generation mould
The rear end pressure of block is supplemented to front end.
Specifically, under accidental conditions, high-pressure natural gas passes through the first shut-off valve successively after high pressure pipe network comes out
1, the first solenoid valve 2, electric control valve 3 adjust flow, 5 metering temperature pressure of the first temperature transmitter 4 and first pressure transmitter
Enter expanding machine 6 after power to be depressured, after temperature and pressure balancer 12 is adjusted, passes through second temperature transmitter 13, second pressure transmitter
14, temperature is increased into downstream pipe network after entering heat exchanger 16 after the second shut-off valve 15.
Pressure energy is converted to mechanical energy by high-pressure natural gas by expanding machine 6, makes expanding machine 6 and power generation by shaft coupling 7
Machine 9, which matches, sends out electric energy.Cryogenic natural gas after expansion by cold energy with after refrigerant heat exchange in heat exchanger 16 by supplying downstream
With device for cooling 17.
It is reduced suddenly under emergency work condition, such as when emergency shutdown or natural gas power load occurs in natural gas expansion system
When, 2 moment of the first solenoid valve closes, while second solenoid valve 10 and 24 moment of third solenoid valve open.It on the one hand expands at this time
Electricity generation module is switched to original voltage-regulating system, ensures the seamless switching between two systems so that natural gas pressure regulating system
Stable operation.On the other hand 6 forefront pressure moment of expanding machine caused by being reduced due to emergency shutdown or load of electrical generation is reduced even
The situations such as no pressure may be caused, it can be by the pressure of 6 rear end of expanding machine by being mended after the first check valve 11 and second solenoid valve 10
It is charged to expanding machine front end, the damages such as 6 system locking of expanding machine caused by preventing 6 forefront pressure moment of expanding machine from reducing so that swollen
6 slow machine halt of swollen machine, to ensure its safety and stability.
Embodiment
The technical program is usually applied to natural gas pressure regulating station.Before the technical solution is implemented, gas component, stream need to be understood
The data such as pressure, temperature before and after amount, pressure regulation, and according to the capacity of the data of understanding selection Natural gas expander group.And it selects to close
Suitable instrument valve is matched.
By natural gas transportation amount be pressure regulation amount for the voltage regulating station of 4500Nm3/h for, voltage regulating station Inlet pressure 1.6MPa
(a), the pressure after pressure regulation is 0.4MPa (a), and natural gas initial temperature is about 20 DEG C.This programme uses high-pressure natural gas pressure energy
After power generation, the natural gas cold energy of low temperature is used for downstream with ice user for film-making ice.
This programme expanding machine 6 selects SEPG180-80-3000-1.65-S type screw expanders, and expansion efficiency is about 0.65；
Shaft coupling selects H-type yielding coupling；Generator selects the asynchronous generator of Nanyang explosion-proof type；Temperature and pressure balancer volume is 30L
Compensator；Heat exchanger is shell-and-tube special type equipment, heat exchange area 60m2；Slice ice machine selects ICESTA slice ice machines.In this programme
Instrument valve is conventional equipment, wherein the equal ZCKF types gas emergency cut-off valve of solenoid valve, and electric control valve is II types of CXZQH-
Flow control valve.6 front end pipeline caliber of expanding machine is 100mm, and pressure is 40MPa (a), and mating valve Instrumentation Requirement is equal
DN100PN40.6 rear end pipeline caliber of expanding machine is 150mm, and pressure is 16MPa (a), and mating valve Instrumentation Requirement is
DN150PN16.The branch caliber being connected after electric control valve 3 and after temperature and pressure balancer 12 is that 50mm pressure is
16MPa (a), then its branch road second solenoid valve 10 and 11 specification of the first check valve are DN50PN40.
Under accidental conditions, 20 DEG C, 4.0MPa (a), 4500Nm3/h natural gas from high pressure pipe network come out after, successively
It is depressurized to 1.6MPa (a) into expanding machine 6 after metering adjusting, temperature is reduced to -30 DEG C, and heat exchange is entered after voltage stabilizing balancer
Temperature, which increases, after device 16 enters downstream pipe network.In operational process, by the coordinated signals of rotating speed transducer 8 and electric control valve 3,
So that expansion function stable operation under declared working condition.Pressure energy is converted to mechanical energy by high-pressure natural gas by expanding machine 6, is led to
It crosses shaft coupling 7 expanding machine 6 and generator 9 is made to match and send out 80kW electric energy.Cryogenic natural gas after expansion passes through heat exchanger 16
Cold energy is supplied into slice ice machine 17, ice capacity 10t/d after the interior heat exchange with brine.
Under emergency work condition, when there is emergency shutdown in natural gas expansion system or natural gas power load reduces suddenly,
2 moment of first solenoid valve closes, and second solenoid valve 10 and 24 moment of third solenoid valve open.Natural gas pressure regulating system is switched to original
Some voltage-regulating systems ensure that gas downstream stablizes gas supply.Before expanding machine 6 caused by emergency shutdown or load of electrical generation reduce simultaneously
End pressure moment reduces or no pressure, and 1.6MPa (a) gases in 6 rear end temperature and pressure balancer of expanding machine are passed through the in this system
6 front end of expanding machine is added to after one check valve 11 and second solenoid valve 10 so that 6 forefront pressure of expanding machine control to 1.0MPa
(a), hereafter pressure continuously decreases, and 6 rotating speed of expanding machine gradually lowers, and after a whole set of expansion power generation module balancing, expanding machine 6 stops
Machine.The damages such as 6 system locking of expanding machine caused by this programme can prevent 6 forefront pressure moment of expanding machine from reducing so that expanding machine 6
Slow machine halt, to ensure its safety and stability.
It, can according to the technique and scheme of the present invention and this hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (6)
1. a kind of safety operation control that natural gas pipe network pressure energy utilizes realizes system, which is characterized in that including：
Expansion power generation module for being depressured to the high-pressure natural gas flowed out from high pressure pipe network, and will be depressured obtained pressure
Power can be converted into electric energy；
Cryogenic natural gas cold energy use module, after exchanging heat with refrigerant for the cryogenic natural gas after expanding expanded electricity generation module
Supply cold energy；
Monitoring regulation and control module, for monitoring expansion power generation module in real time, when monitoring expansion power generation module emergency shutdown or natural
When gas load of electrical generation drops suddenly, then expansion power generation module is switched into preset voltage-regulating system, and by the rear end of expansion power generation module
Pressure drainage is supplemented to front end；
The expansion power generation module includes being connected to expanding machine (6) between high pressure pipe network and low-pressure pipe network in turn by pipeline,
The output shaft of expanding machine (6) is sequentially connected shaft coupling (7) and generator (9), and the output power of generator (9) is defeated by cable
Go out；Natural gas after expanded machine (6) decompression enters cryogenic natural gas cold energy use mould after being adjusted by temperature and pressure balancer (12)
Block；
The cryogenic natural gas cold energy use module includes heat exchanger (16) and with device for cooling (17), and the of the heat exchanger (16)
One end is connect with the temperature and pressure balancer (12), and second end is connect with third shut-off valve (18), and third end and the 4th end pass through institute
It states and is connected with device for cooling (17)；
The heat exchanger (16) is shell-and-tube heat exchanger, and cryogenic natural gas walks tube side, and refrigerant walks shell side, by cryogenic natural gas cold energy
It is transferred to described with device for cooling (17)；
The monitoring regulates and controls module：
The first shut-off valve (1), the first solenoid valve being successively set between high pressure pipe network and the air inlet of expanding machine (6) on pipeline
(2), electric control valve (3), the first temperature transmitter (4), first pressure transmitter (5)；
The rotating speed transducer (8) connected on the shaft coupling (7)；
The second solenoid valve (10) that the branch road being connected between electric control valve (3) and temperature and pressure balancer (12) is set gradually
And first check valve (11)；
The sequentially connected second temperature transmitter (13) in branch road between temperature and pressure balancer (12) and heat exchanger (16), second
Pressure transmitter (14) and the second shut-off valve (15)；
Sequentially connected third shut-off valve (18), third temperature transmitter in the branch of heat exchanger (16) and downstream pipe network road
(19), third pressure transmitter (20), the second check valve (21), safety valve (22) and the 4th shut-off valve (23)；
The third solenoid valve (24) and pressure regulator (25) set gradually on branch road between high pressure pipe network and low-pressure pipe network.
2. the safety operation control that natural gas pipe network pressure energy utilizes according to claim 1 realizes system, which is characterized in that described
Expanding machine (6) is turbo-expander or screw expander.
3. the safety operation control that natural gas pipe network pressure energy utilizes according to claim 1 realizes system, which is characterized in that described
Temperature and pressure balancer (12) is the compensator of 20-50L, and deicing silk screen is arranged inside compensator.
4. the safety operation control that natural gas pipe network pressure energy utilizes according to claim 1 realizes system, which is characterized in that described
Electric control valve (3) links with rotating speed transducer (8), electronic when expanding machine (6) rotating speed is more than preset maximum speed
Regulating valve (3) aperture reduces；When expanding machine (6) rotating speed is less than preset lower limit rotating speed, electric control valve (3) aperture increases.
5. the safety operation control that natural gas pipe network pressure energy utilizes according to claim 1 realizes system, which is characterized in that described
First solenoid valve (2), second solenoid valve (10) and third solenoid valve (24) link, when the first solenoid valve (2) are opened, the
Two solenoid valves (10) and third solenoid valve (24) are in off state；When the first solenoid valve (2) are closed, second solenoid valve (10)
And third solenoid valve (24) is open state.
6. a kind of safety operation control implementation method that natural gas pipe network pressure energy utilizes, which is characterized in that the method includes following
Step：
Expansion power generation module is depressured the high-pressure natural gas flowed out from high pressure pipe network, and turns obtained pressure energy is depressured
Turn to electric energy；
Cryogenic natural gas cold energy use module expanded electricity generation module is expanded after the heat exchange of cryogenic natural gas and refrigerant after supply
Cold energy；
Monitoring regulation and control module monitors expansion power generation module in real time, when monitoring expansion power generation module emergency shutdown or natural gas power
When load is dropped suddenly, then expansion power generation module is switched into preset voltage-regulating system, and the rear end pressure of expansion power generation module is mended
It is charged to front end；
The expansion power generation module includes being connected to expanding machine (6) between high pressure pipe network and low-pressure pipe network in turn by pipeline,
The output shaft of expanding machine (6) is sequentially connected shaft coupling (7) and generator (9), and the output power of generator (9) is defeated by cable
Go out；Natural gas after expanded machine (6) decompression enters cryogenic natural gas cold energy use mould after being adjusted by temperature and pressure balancer (12)
Block；
The cryogenic natural gas cold energy use module includes heat exchanger (16) and with device for cooling (17), and the of the heat exchanger (16)
One end is connect with the temperature and pressure balancer (12), and second end is connect with third shut-off valve (18), and third end and the 4th end pass through institute
It states and is connected with device for cooling (17)；
The heat exchanger (16) is shell-and-tube heat exchanger, and cryogenic natural gas walks tube side, and refrigerant walks shell side, by cryogenic natural gas cold energy
It is transferred to described with device for cooling (17)；
The monitoring regulates and controls module：
The first shut-off valve (1), the first solenoid valve being successively set between high pressure pipe network and the air inlet of expanding machine (6) on pipeline
(2), electric control valve (3), the first temperature transmitter (4), first pressure transmitter (5)；
The rotating speed transducer (8) connected on the shaft coupling (7)；
The second solenoid valve that the branch road being connected between electric control valve (3) and temperature and pressure balancer (12) is set gradually
(10) and the first check valve (11)；
The sequentially connected second temperature transmitter (13) in branch road between temperature and pressure balancer (12) and heat exchanger (16), second
Pressure transmitter (14) and the second shut-off valve (15)；
Sequentially connected third shut-off valve (18), third temperature transmitter in the branch of heat exchanger (16) and downstream pipe network road
(19), third pressure transmitter (20), the second check valve (21), safety valve (22) and the 4th shut-off valve (23)；
The third solenoid valve (24) and pressure regulator (25) set gradually on branch road between high pressure pipe network and low-pressure pipe network.
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| CN110185506A (en) * | 2019-05-27 | 2019-08-30 | 西南石油大学 | A kind of natural gas pressure regulating station pressure energy utilization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107120148A (en) * | 2017-05-25 | 2017-09-01 | 华南理工大学 | A kind of pressure energy generating Internet device |
| CN108204245B (en) * | 2018-01-23 | 2021-05-04 | 深圳市燃气集团股份有限公司 | Natural gas pipe network pressure recovery method and device |
| CN108252759A (en) * | 2018-02-07 | 2018-07-06 | 广州莱仑特种装备有限公司 | A kind of intelligentized small-sized cold energy generation device and its control method |
| CN108316981A (en) * | 2018-03-14 | 2018-07-24 | 中节能工程技术研究院有限公司 | Natural gas overbottom pressure and gas turbine coupling combined supplying system, pipe network system and method |
| CN111828834A (en) * | 2020-07-29 | 2020-10-27 | 中海石油气电集团有限责任公司 | BOG processing system and method for LNG receiving station |
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| CN112361214A (en) * | 2020-11-27 | 2021-02-12 | 无锡玄同科技有限公司 | Natural gas pressure regulating system |
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| CN110185506A (en) * | 2019-05-27 | 2019-08-30 | 西南石油大学 | A kind of natural gas pressure regulating station pressure energy utilization system |
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