CN106437911B - A kind of gas distributing system overbottom pressure comprehensive generating system - Google Patents
A kind of gas distributing system overbottom pressure comprehensive generating system Download PDFInfo
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- CN106437911B CN106437911B CN201610753872.4A CN201610753872A CN106437911B CN 106437911 B CN106437911 B CN 106437911B CN 201610753872 A CN201610753872 A CN 201610753872A CN 106437911 B CN106437911 B CN 106437911B
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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
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
-
- 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
-
- 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
- F01K13/006—Auxiliaries or details not otherwise provided for
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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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention provides a kind of gas distributing system overbottom pressure comprehensive generating system, and it is connected to natural gas line, and is substantially arranged in parallel with original natural gas pressure regulating device, including：Natural gas top pressure power generation subsystem, natural gas waste cold power generation sub-system, lubrication oil subsystem and monitoring regulation and control subsystem.Natural gas top pressure power generation subsystem using high-pressure natural gas be depressured caused by pressure energy generated electricity, natural gas waste cold power generation sub-system is using the cryogenic natural gas after the decompression of natural gas top pressure power generation subsystem as low-temperature receiver, generated electricity by thermal source of normal temperature air, lubricate oil subsystem and lubrication is provided, adjustment is monitored to running status by monitoring regulation and control subsystem.According to the gas distributing system overbottom pressure comprehensive generating system of the present invention, the pressure energy in gas distributing system can be made full use of, improve capacity usage ratio.Natural gas does not contact with lubricating oil, reduces pollution of the lubricating oil to natural gas.And whole device is assembled into machine sled, convenience in transport and installation.
Description
Technical field
Present invention relates generally to gas distributing system hydraulic recovery power field, relates more specifically to a kind of based on the double spiral shells of oil-free
The gas distributing system overbottom pressure comprehensive generating system of bar expanding machine.
Background technology
Natural gas is increasingly paid attention to as a kind of cleaning, efficient fossil energy, its utilization by countries in the world.
At present, natural gas long-distance transport mainly by pipe network system progress, on our times the transport of long-distance pipeline use
High pressure gas transmission, discharge pressure typically deliver to each city or large-scale user in more than 10MPa, natural gas upstream by high pressure pipe network,
0.4MPa or so is depressurized to by various regions natural gas pressure regulating station and delivers to user's use, most pressure energy is unrestrained during this
Expense is fallen.
With the development of economic and technical, some recovery and utilization technologies to overbottom pressure in gas distributing system have been engendered,
It is broadly divided into refrigeration utilization and gas-to electricity.Wherein, refrigeration utilizes mainly ice making and refrigeration etc. of living；Pressure energy electrification technique
It is required that the flow and pressure of natural gas are relatively stable, but there is serious inhomogeneities in the use of natural gas, so can not expire
The stable operation of sufficient generating equipment, and the layout at natural gas pressure regulating station is more scattered, and small electrical system does not possess online
Condition, be unfavorable for build large-scale power recovery system, can only be used by oneself in door station, unnecessary electricity can not store and cause wave
Take.
Authorization Notice No. is that CN105201558A patent of invention discloses a kind of natural gas based on single-screw expander
Feed-line top pressure power generation system, the invention are mainly to be carried out the pressure energy of natural gas transmission pipeline using single-screw expander
Generate electricity, low pressure natural gas after expansion enters gs-oil separator by natural gas and lubricating oil separation, and the natural gas after separation is through sky
Hot-air heater delivers to downstream user into original natural gas transmission pipeline, and lubricating oil is added lubricating oil by grease pump after separation
The position that single-screw expander needs to lubricate is pumped into after pressure again, while cryogenic natural gas is gone up under by air heater
Swim the temperature that user needs.The technique that the invention proposes is only with the natural gas overbottom pressure of part, also substantial amounts of cold energy
It is wasted, generating efficiency is relatively low, and lubricating oil is in contact with natural gas, causes the pollution of natural gas.
Authorization Notice No. is that CN103334891A patent of invention discloses a kind of natural gas pressure regulating formula TRT, the hair
It is bright to be generated electricity using turbine apparatus recovery pressure energy of natural gas.The technique that the invention proposes, had not both accounted for the recycling of cold energy,
Also without equipment blocking caused by a large amount of cold energy and corrosion is discharged after solution natural gas direct expansion the problems such as.
In addition, the utility model patent that Authorization Notice No. is CN203430574U, which discloses one kind, utilizes mini gas pipe
The device that net pressure energy generates electricity, the utility model are proposed to be generated electricity using small gas expanding machine recovery pressure energy of natural gas, realized
The personal function of small-power generating.Natural gas after expansion returns by the stable gas pressure of pressure and temp balancer and to natural gas
Temperature.Although the utility model rationally make use of pressure energy of natural gas to realize that generating is personal, because generated output is smaller, only 1
~5kW, be not suitable for the larger natural gas pressure regulating place of flow.Meanwhile the utility model equally exists natural gas cold energy and can not returned
The problem of receipts, and after the natural gas after expanding is adjusted by pressure and temp balancer, natural gas is risen again limited extent, expansion release
Cold energy can still cause equipment block and etching problem.
Similarly, the patent of invention that Authorization Notice No. is CN104088605A discloses a kind of pressure energy that is based on and sent out electrically and thermally
The natural gas wellhead heating throttle system of pump heating, the invention substitute traditional throttling pressure regulation dress using expanding machine generating set
Put, the pressure energy in the natural gas that gas well is produced using expansion power generator is converted to electric energy, and the cryogenic natural gas after expansion adds
Heat recovers natural gas temperature part by air preheater using amount of heat first, then produced by expansion power generation unit
Electrical energy drive heat pump, by reheater by the heat of heat pump be used for heat the natural gas after air preheater so that it is swollen
Heated by natural gas after swollen decompression is to the temperature sent outside needed for gathering line.The technique that the invention proposes is although save natural gas
The energy of heating, and risen again by the concurrent heating of natural gas after heat pump assembly realization expansion, but returning for cold energy is not accounted for still
Receive and utilize.
Authorization Notice No. is that CN105041395A patent of invention discloses one kind by refrigerating coolant subsystem pressure energy
Power generation sub-system and refrigeration concurrent heating subsystem combine, to realize pressure energy recovery comprehensive utilization, using being classified concurrent heating side
Formula, while improving natural gas expansion power generation amount, recovery natural gas cold energy is used to produce commodity ice or carries cooling needs.The hair
The technique of bright proposition, block and etching problem, but use point although it is contemplated that discharging equipment caused by a large amount of cold energy after expansion
What the mode of level concurrent heating was carried out, the complexity of technique is added, and waste the cold energy of part.
In order to comprehensively utilize pressure energy of natural gas, Authorization Notice No. is that CN203847188U utility model patent discloses
A kind of natural gas pressure regulating station complementary energy synthesis utilizes system, and the utility model is using the pressure in expansion power generation unit recovery natural gas
Can, and cryogenic natural gas cold energy generation and recovery section cold energy are utilized by low-temperature electricity-generating unit.Meanwhile enter one by heat exchanger
Step recovery low-temperature electricity-generating unit utilize after cold energy, the cold cooling user of recovery or directly to environmental emission.With above-mentioned hair
Bright patent is compared, and is effectively utilized the cold energy of natural gas, but because natural gas is not preprocessed, at normal temperatures using expansion power generation
Equipment will be caused to block, corrode for unit direct expansion and the generation of wear phenomena, and the generating efficiency base of low-temperature electricity-generating unit
This is 10% or so, and cost of investment is big, and cold energy use rate is low.
The technology contents of the above patent, it is not perfect enough, following technical problem be present：
1) lubricating oil is in contact with natural gas, easily causes the pollution of natural gas；
2) natural gas of normal temperature can separate out a small amount of ice cube, for turbo-expander etc., can have a strong impact on it by expansion
Safe operation；
3) when using overbottom pressure in gas distributing system, the natural gas after expanded machine expansion contains substantial amounts of cold energy, still
The overwhelming majority is all directly exchanged heat with air, and this part cold energy is wasted；
4) for most natural gas line, mass flow discrepancy is even, easily causes the shakiness of expanding machine admission line pressure
It is fixed, cause the pressure of generating and frequency unstable, have a strong impact on grid-connected；
5) most TRT is required for manually being operated and installation etc., adds the risk of operation.
Therefore, it is necessary to a kind of gas distributing system overbottom pressure comprehensive generating system, to solve the above problems at least in part.
The content of the invention
To solve the above problems at least in part, the present invention provides a kind of gas distributing system overbottom pressure comprehensive generating system, its
It is characterised by, the gas distributing system overbottom pressure comprehensive generating system is connected to natural gas line, and is filled with original natural gas pressure regulating
Put and be substantially arranged in parallel, including：
Natural gas top pressure power generation subsystem, the natural gas top pressure power generation subsystem is using produced by high-pressure natural gas decompression
Pressure energy generated electricity；
Natural gas waste cold power generation sub-system, the natural gas waste cold power generation sub-system is with by the natural gas top pressure power generation
Cryogenic natural gas after subsystem decompression is low-temperature receiver, is generated electricity by thermal source of normal temperature air；
Oil subsystem is lubricated, it is described to lubricate more than oil subsystem and the natural gas top pressure power generation subsystem and the natural gas
Cold power generation sub-system connects to provide lubrication respectively；And
Monitoring regulation and control subsystem, fortune of the monitoring regulation and control subsystem to the gas distributing system overbottom pressure comprehensive generating system
Row state is monitored adjustment.
Alternatively, the natural gas top pressure power generation subsystem and prime mover of the natural gas waste cold power generation sub-system are nothing
Oily twin-screw expander.
Alternatively, the natural gas top pressure power generation subsystem includes：
Natural gas pretreatment unit, the entrance of the natural gas pretreatment unit is connected to high pressure gas pipeline, described
The outlet of natural gas pretreatment unit is connected to original natural gas pressure regulating device by natural gas original pipeline regulating valve；
First oil-free twin-screw expander, the air inlet of the first oil-free twin-screw expander are connected to the natural gas
The outlet of pretreatment unit, the gas outlet of the first oil-free twin-screw expander are connected to original natural gas pressure regulating device
The low pressure natural gas pipes in downstream；
Dynamic reductor, the dynamic reductor are connected with the rotor of the first oil-free twin-screw expander；And
Generator, the generator are connected with the dynamic reductor.
Alternatively, the natural gas waste cold power generation sub-system includes：
Second oil-free twin-screw expander, the rotor of the second oil-free twin-screw expander are connected to the generator；
Condenser, the entrance of the working medium side of the condenser and the gas outlet of the second oil-free twin-screw expander connect
Connect, the inlet and outlet of the low-temperature receiver side of the condenser be respectively connecting to the gas outlet of the first oil-free twin-screw expander with it is described
Pipeline between low pressure natural gas pipes；
Working medium pump, the entrance of the working medium pump are connected with the outlet of the working medium side of the condenser；
Evaporator, the entrance of the working medium side of the evaporator are connected with the outlet of the working medium pump, the work of the evaporator
The outlet of matter side is connected with the air inlet of the second oil-free twin-screw expander, and the evaporator is used as thermal source using air.
Alternatively, the lubrication oil subsystem includes：
Grease-box, the grease-box come from the natural gas top pressure power generation subsystem and the natural gas to collect
The high temperature grease of waste cold power generation sub-system；
Oil pump, the entrance of the oil pump are connected with the outlet of the grease-box；
Oil strainer, the entrance of the oil strainer are connected with the outlet of the oil pump；
Heat exchanger, the entrance of the lubricating oil side of the heat exchanger are connected with the outlet of the oil strainer；
Oil dispenser, the entrance of the oil dispenser are connected with the outlet of the lubricating oil side of the heat exchanger, the oil
Orchestration is to by the distribution of lubrication oil of low temperature to the natural gas top pressure power generation subsystem and the natural gas waste cold generating subsystem
The position that the needs of system lubricate.
Alternatively, the monitoring regulation and control subsystem includes PLC control cabinet and connected with the PLC control cabinet by signal wire
The monitoring device and flow regulator connect.Alternatively, the PLC control cabinet plays Data Detection and regulation and control.
Alternatively, working medium is low boiling working fluid used by the natural gas waste cold power generation sub-system, such as R22,
R134a、CO2, ammonia etc..
Alternatively, the condenser and the heat exchanger are plate type heat exchanger, and the evaporator dissipates for a kind of efficiently fin
Hot device.
Alternatively, the import of the heat exchanger cold side is respectively connecting to the first oil-free twin-screw expander with outlet
On pipeline between gas outlet and low pressure natural gas pipes, the low-temperature receiver of the heat exchanger is by natural gas top pressure power generation
A part of cryogenic natural gas after system decompression.
Alternatively, according to the pressure of required lubricating oil, restriction orifice is arranged in the outlet of the oil dispenser.
Alternatively, in the outlet of the natural gas pretreatment unit and the air inlet of the first oil-free twin-screw expander
Between pipeline on first flow regulating valve, flowmeter and first pressure transmitter be set, the monitoring regulation and control subsystem according to
The change of the pressure signal of the first pressure transmitter adjusts the air inlet of valve regulation high-pressure natural gas by the first flow
Amount.
Alternatively, the low-temperature receiver side of the heat exchanger entrance and the first oil-free twin-screw expander gas outlet it
Between pipeline on be provided with second flow regulating valve, second pressure transmitter and temperature pick-up are provided with the oil dispenser
Device, the monitoring regulation and control subsystem pass through described according to the signal intensity of the second pressure transmitter and the temperature transmitter
Second flow regulation valve regulation enters the air inflow of the cryogenic natural gas of the heat exchanger.
Alternatively, in the axle and casing of the first oil-free twin-screw expander and the second oil-free twin-screw expander
On be respectively arranged vibrating sensor, by it is described monitoring regulate and control subsystem be monitored control, when casing vibration values are more than predetermined value
When, Concatenate shut-down immediately.
Alternatively, the gas distributing system overbottom pressure comprehensive generating system makes overall skid-mounted formula.
Alternatively, detection of natural gas sensor is arranged in the skid, regulating and controlling subsystem by the monitoring is monitored
Control, when concentration of natural gas is more than predetermined value, Concatenate shut-down immediately.
According to the gas distributing system overbottom pressure comprehensive generating system of the present invention, prime mover is the double spiral shells of oil-free used by generator
Bar expanding machine, in the process of running, lubricating oil do not contact with natural gas, so as to avoid natural gas asking by lubricant pollution
Topic, and the property due to oil-free twin-screw expander in itself, natural gas can be ignored by the ice cube that expansion separates out to operation
Influence.Lubricating oil is cooled down using the cryogenic natural gas after part expansion decompression, effectively raises lubricating oil
Quality, enhance lubricant effect, also this part cold energy effectively utilized.Waste cold power generation sub-system is added, it is right
A large amount of cold energy are more fully utilized caused by the expanded decompression of natural gas.Become by using PLC combinations magnetic valve, pressure
Device, leak detector and sealer sled are sent, is capable of the running status of automatic real time monitoring TRT, pressure is exceeded, combustion
The situations such as gas leakage when occurring can voluntarily early warning and Concatenate shut-down, possess superior safety and stability.Pass through structure
Whole device is assembled into machine sled by optimization, can convenience in transport and installation, present apparatus inlet and outlet are directly parallel to original during installation
Pressure regulation pipe network can be run, and have the advantages of application easy to spread, the security risk that site operation can also be avoided to bring.
Brief description of the drawings
Drawings below is used to understand the present invention in this as the part of the present invention.In accompanying drawing：
Fig. 1 is the principle schematic of the gas distributing system overbottom pressure comprehensive generating system shown in the present invention.
Embodiment
In the following description, a large amount of concrete details are given to provide more thorough understanding of the invention.So
And it will be apparent to one skilled in the art that the present invention can be able to without one or more of these details
Implement.In other examples, in order to avoid obscuring with the present invention, do not enter for some technical characteristics well known in the art
Row description.
For above-mentioned a series of problems, the invention provides a kind of gas distributing system overbottom pressure comprehensive generating system, and it is wrapped
Include natural gas top pressure power generation subsystem, natural gas waste cold power generation sub-system, lubrication oil subsystem and monitoring and controlling subsystem.
Gas distributing system overbottom pressure comprehensive generating system shown in the present invention by the use of oil-free twin-screw expander as prime mover,
As the lubricating oil contact of the natural gas discord unit of working medium, pollution of the lubricating oil to natural gas can be effectively reduced.In addition,
When natural gas normal temperature expands, easily ice cube is caused to separate out because temperature declines, the presence of ice cube can be had a strong impact on using turbine
The operation of the system of expanding machine, but for the operation of oil-free twin-screw expander, without too much influence.Natural gas top pressure power generation
Subsystem is generated electricity using the pressure energy expansion work of high-pressure natural gas.Expansion work is depressured later natural gas temperature drop
Low, containing has substantial amounts of cold energy, and the sub-fraction of these cold energy is used for cooling to lubricating oil, more than natural gas
The low-temperature receiver of cold power generation sub-system.The present invention is innovatively by the cold energy after the expansion power generation of pressure energy in gas distributing system and expansion
Using combining, energy utilization efficiency further increasing.Embedded monitoring and controlling subsystem, monitors whole natural gas automatically
The running status of remaining pressure of piping system comprehensive generating system, and the action of each pneumatic operated valve is automatically adjusted according to running state parameter, reach
To optimal generating effect.When operational factor exceedes the interlocking value of setting, monitoring and controlling subsystem may also function as interlock protection work(
Energy, greatly improve the safe and reliable operation of equipment.Meanwhile whole gas distributing system overbottom pressure comprehensive generating system can be made
The skid-mounted type structure of one entirety, it is only necessary to admission line and discharge duct and natural gas leaking report are arranged outside skid structure
Alarm device etc., the difficulty of installation and construction is greatly reduced, occasion is utilized suitable for various natural gas overbottom pressure.
The gas distributing system overbottom pressure comprehensive generating system shown in the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, original natural gas pressure regulating device 90 is arranged on natural gas main pipeline, regulating valve 91 and 92 distinguishes position
In on the high and low pressure natural gas line of original both sides of natural gas pressure regulating device 90, whole gas distributing system overbottom pressure comprehensive electric generating system
System is substantially in be arranged in parallel with original natural gas pressure regulating device 90.Gas distributing system overbottom pressure comprehensive generating system is by natural gas overbottom pressure
Power generation sub-system, natural gas waste cold power generation sub-system, lubrication oil subsystem and the part of monitoring and controlling subsystem four composition.
Specifically, natural gas top pressure power generation subsystem includes natural gas pretreatment unit 10, the first oil-free twin-screw expands
Machine 11, dynamic reductor 12 and generator 13.Wherein, natural gas pretreatment unit 10 is arranged on natural gas main pipeline, its import
It is connected with high pressure gas pipeline, its oil-free twin-screw of regulating valve 91 and first for exporting respectively with natural gas original pipeline expands
The air inlet of machine 11 is connected.The gas outlet of first oil-free twin-screw expander 11 is connected to the regulating valve 92 of natural gas original pipeline
Downstream low pressure natural gas main pipeline on.The rotor of first oil-free twin-screw expander 11 is connected with dynamic reductor 12, dynamic to subtract
Fast machine 12 is connected to generator 13, and hair is driven so as to realize the first oil-free twin-screw expander 11 in the presence of high-pressure natural gas
The operating of motor 13 generates electricity.
Natural gas waste cold power generation sub-system includes the second oil-free twin-screw expander 20, condenser 21, working medium pump 22 and steamed
Send out device 23.Wherein, the rotor of the second oil-free twin-screw expander 20 is pivotally connected to generator 13, and power is provided for generator 13.
The low-temperature receiver inlet and outlet of condenser 21 be connected to the gas outlet of the first oil-free twin-screw expander 11 and low pressure natural gas main pipeline it
Between natural gas line on, using the low-temperature receiver by the cryogenic natural gas after expansion work as condenser 21, evaporator 23
Thermal source is normal temperature air, has been achieved in that the recycling of cold energy, has further increased energy utilization efficiency, it is also possible to
Heating is carried out to cryogenic natural gas to rise again, and saves the energy of special heated by natural gas.Natural gas waste cold power generation sub-system institute
The working medium used is low boiling working fluid, such as R22, R134a, CO2, ammonia etc..
Lubrication oil subsystem includes grease-box 30, oil pump 31, oil strainer 32, heat exchanger 33 and oil dispenser 34.Its
In, grease-box 30 is collecting the high temperature from natural gas top pressure power generation subsystem and the natural gas waste cold power generation sub-system
Lubricating oil.High temperature grease, by the filtering of oil strainer 32, is dropped by the pressurized delivered of oil pump 31 into heat exchanger 33
Temperature.The used low-temperature receiver of heat exchanger 33 is a part of low temperature day after natural gas top pressure power generation subsystem expansion work
Right gas, so lubricating oil is being cooled to provide good lubricant effect, can also be to warp while recovery to part cold energy
The a certain degree of heating of cryogenic natural gas progress for crossing heat exchanger 33 is risen again, and plays the effect of energy-conservation.Cool by heat exchanger 33
Lubricating oil enter oil dispenser 34, the distribution of lubrication oil of low temperature to natural gas top pressure power generation subsystem and natural gas waste cold are sent out
The position that the needs of electronic system lubricate, such as the first oil-free twin-screw expander 11 and the second oil-free twin-screw expander 20
Bearing and synchromesh gear, the bearing and the bearing of gear and generator 13 of dynamic reductor 12.According to lubricating oil needed for each position
Pressure difference, be respectively disposed with each outlet of oil dispenser 34 restriction orifice (not shown) not of uniform size with to profit
Lubricating oil carries out throttling control.
Monitoring and controlling subsystem includes PLC control cabinet and a series of monitoring device and flow regulator, PLC control cabinet
Detection means and flow regulator are connected to by signal wire.It is double in the outlet of natural gas pretreatment unit 10 and the first oil-free
On pipeline between the air inlet of screw expander 11, first flow regulating valve 41, flowmeter 42, first pressure pick-up are disposed with
Device 43 and stop valve 44, in system operation, PLC control cabinet 40 passes through flowmeter 42 and the letter of first pressure transmitter 43
Number carry out the running status of monitoring system, when flow and pressure fluctuate, PLC control cabinet regulation first flow regulating valve
The flow and pressure of natural gas are adjusted 41 aperture size, ensure the stable operation of system.When system occurs abnormal,
Control stop valve 44 to cut off natural gas, ensure the safety of system.Temperature transmitter 45 and second is disposed with oil dispenser 34
Pressure transmitter 46, the temperature and pressure of the lubricating oil after cooling is detected, while in the first oil-free twin-screw expander
Second flow regulating valve 47 is provided with natural gas line between 11 gas outlet and heat exchanger 33, in the first oil-free twin-screw
The 3rd flow control valve 48 is provided with natural gas line between the gas outlet of expanding machine 11 and condenser 21.When monitoring oil
When the temperature of lubricating oil in distributor 34 is too low or too high, PLC control cabinet 40 is by controlling second flow regulating valve 47 and
The apertures of three flow control valves 48 is to be reduced or increased the flow of the cryogenic natural gas by heat exchanger 33, so that lubricating oil
Temperature is in optimum state to provide optimal lubricant effect.From safety considerations, in the first oil-free twin-screw expander 11
Vibrating sensor (not shown) is respectively arranged with the axle and casing of the second oil-free twin-screw expander 20, day is arranged in skid
Right gas detection sensor (not shown), is carried out from monitoring and controlling by PLC control cabinet 40, when monitoring that casing vibration values are more than some
Predetermined value, for example during 11.2mm/s or monitor that concentration of natural gas is more than some predetermined value, such as when 25%, PLC controls
Cabinet 40 processed controls gas distributing system overbottom pressure comprehensive generating system Concatenate shut-down immediately, prevents security incident.In addition, condensing
The 4th flow control valve 49 and the 3rd pressure inverting are disposed with pipeline between the outlet of device 21 and low pressure natural gas main pipeline
Device 50, PLC control cabinet 40 is connected to by signal wire, to increase the redundancy of system control.
The operation principle of gas distributing system overbottom pressure comprehensive generating system shown in the present invention is as follows：
After high-pressure natural gas in high-pressure natural gas main pipeline pre-processes by natural gas pretreatment unit 10, by the
One flow control valve 41, flowmeter 42 and stop valve 44 enter the first oil-free twin-screw expander 11, while PLC control cabinet 40 is supervised
Survey the pressure signal of high-pressure natural gas.High-pressure natural gas expansion work drive rotor in the first oil-free twin-screw expander 11 turns
It is dynamic, while natural gas decompression cooling.The rotation of the rotor of first oil-free twin-screw expander 11 is passed to by dynamic reductor 12
Generator 13 is generated electricity, so that the pressure energy of high-pressure natural gas is electric energy.PLC control cabinet 40 passes through the pressure that receives
The aperture of force signal regulation first flow regulating valve 41, namely the air inflow of the first oil-free twin-screw expander 11 of regulation, ensure
System stable operation.
Sub-fraction by the acting of natural gas top pressure power generation subsystem and the natural gas of decrease temperature and pressure enters lubrication foxy old hand
In the heat exchanger 33 of system, exchanged heat with high temperature grease, while cooling to lubricating oil to improve lubricant effect, also given
This portion of natural gas carries out heating of rising again.Now, PLC control cabinet 40 is according to the temperature transmitter on oil dispenser 34
45 and the second pressure transmitter 46 temperature and pressure signal of subzero oil that is transmitted control second flow regulating valve 47
With the aperture of the 3rd flow control valve 48, namely the air inflow of regulation heat exchanger 33, lubricating oil is set to reach most after cooling
Temperature required by good lubricant effect.
Mix, enter with remaining cryogenic natural gas after the cryogenic natural gas discharge heat exchanger 33 that fraction exchanges heat with lubricating oil
Enter in condenser 21, as low-temperature receiver, the working medium of natural gas waste cold power generation sub-system is condensed, realizes the utilization of cold energy, together
When heating of rising again also is carried out to cryogenic natural gas.Working medium is condensed into liquid in condenser 21 by cryogenic natural gas, by working medium pump
22 are delivered to evaporator 23, are evaporated using normal temperature air as thermal source and are changed into gaseous state, and gaseous working medium enters the double spiral shells of the second oil-free
Acting drive rotor rotates in bar expanding machine 20.The rotation of rotor passes to generator 13 and generated electricity again.Gas after acting
State working medium reenters condenser 21 and condensed by cryogenic natural gas, forms circulation.With the working medium of natural gas waste cold power generation sub-system
Cryogenic natural gas temperature after heat exchange obtains a certain degree of rise, after the discharge of condenser 21, by the 3rd pressure inverting
The flow control valve 49 of device 50 and the 4th enters low pressure natural gas main pipeline, is generated electricity so as to complete whole natural gas overbottom pressure comprehensive utilization
Process.
The course of work of the gas distributing system overbottom pressure comprehensive generating system shown in the present invention is done with reference to instantiation
Further describe.
Gaseous state and generated energy after the first oil-free twin-screw expander 11 is as shown in table 1：
Natural gaseity and generated energy of the table 1 after the first oil-free twin-screw expander 11
Through the gas cold energy use amount after lubrication oil subsystem：
Assuming that the lubricating oil used is No. 32 lubricating oil, the first oil-free twin-screw expander 11 and the second oil-free twin-screw are swollen
Heat energy caused by the bearing and synchromesh gear of swollen machine 20, the bearing of dynamic reductor 12 and the bearing of gear and generator 13 etc. is complete
Portion is taken away by lubricating oil, is calculated according to mechanical loss for 10%, the mechanical loss heat under different conditions is as shown in table 2：
The mechanical loss heat of table 2
Assuming that the inlet oil temperature of lubricating oil is 40 DEG C, when going out heat exchanger 33, the temperature of lubricating oil is 20 DEG C of normal temperature, ignores and changes
Heat exchange loss of the hot device 33 to surrounding environment, according to energy balance, the heat dissipation capacity of lubricating oil is equal to what cryogenic natural gas was absorbed
Heat, i.e.,：
Q=mccp,c(Tc,i-Tc,o)=mhcp,h(Th,i-Th,o)
Wherein：mc,mh--- natural gas, the flow of lubricating oil, kg/s are represented respectively
cp,c,cp,h--- natural gas, the specific heat at constant pressure of lubricating oil are represented respectively,
Tc,i,Tc,o--- the out temperature of natural gas is represented, DEG C
Th,i,Th,o--- the out temperature of lubricating oil is represented, DEG C
According to above formula, according to the mass flow of lubricating oil, for 2.88kg/s calculating, (size of lubricants capacity will be by reality
Border operating mode is specifically adjusted), the specific heat at constant pressure of lubricating oil isThe heat exchange amount of natural gas and lubrication oil subsystem
As shown in table 3：
The cryogenic natural gas of table 3 and lubrication oil subsystem heat exchange amount
Further, the generated energy using natural gas waste cold is adjusted according to the delivery temperature of natural gas, according to environment temperature
For 20 DEG C of calculating.In natural gas waste cold power generation sub-system, working medium can select R134a, R22, CO2Or ammonia etc., this example
The middle refrigerant used is 20% calculating by generating efficiency for R134a, and gained generated energy is as shown in table 4：
The natural gas waste cold power generation sub-system generated energy of table 4
Therefore, total generated energy is as shown in table 5：
The gas distributing system overbottom pressure comprehensive generating system gross generation of table 5
The present invention is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is only intended to
Citing and the purpose of explanation, and be not intended to limit the invention in described scope of embodiments.Those skilled in the art can
With understanding, more kinds of variants and modifications can also be made according to the teachings of the present invention, these variants and modifications are all fallen within
Within scope of the present invention.Protection scope of the present invention is by the appended claims and its equivalent scope institute circle
It is fixed.
Claims (17)
- A kind of 1. gas distributing system overbottom pressure comprehensive generating system, it is characterised in that the gas distributing system overbottom pressure comprehensive electric generating system System is connected to natural gas line, and is arranged in parallel with original natural gas pressure regulating device, including：Natural gas top pressure power generation subsystem, the natural gas top pressure power generation subsystem are pressed using caused by high-pressure natural gas decompression Power can be generated electricity；Natural gas waste cold power generation sub-system, the natural gas waste cold power generation sub-system is with by the natural gas top pressure power generation subsystem Cryogenic natural gas after system decompression is low-temperature receiver, is generated electricity by thermal source of normal temperature air；Oil subsystem is lubricated, the lubrication oil subsystem is sent out with the natural gas top pressure power generation subsystem and the natural gas waste cold Electronic system connects to provide lubrication respectively；AndMonitoring regulation and control subsystem, operation shape of the monitoring regulation and control subsystem to the gas distributing system overbottom pressure comprehensive generating system State is monitored adjustment.
- 2. gas distributing system overbottom pressure comprehensive generating system according to claim 1, it is characterised in that the natural gas overbottom pressure Prime mover of power generation sub-system and the natural gas waste cold power generation sub-system is oil-free twin-screw expander.
- 3. gas distributing system overbottom pressure comprehensive generating system according to claim 2, it is characterised in that the natural gas overbottom pressure Power generation sub-system includes：Natural gas pretreatment unit, the entrance of the natural gas pretreatment unit is connected to high pressure gas pipeline, described natural The outlet of gas pretreatment unit is connected to original natural gas pressure regulating device by natural gas original pipeline regulating valve；First oil-free twin-screw expander, the air inlet of the first oil-free twin-screw expander are connected to the natural gas and located in advance The outlet of device is managed, the gas outlet of the first oil-free twin-screw expander is connected to original natural gas pressure regulating device downstream Low pressure natural gas pipes；Dynamic reductor, the dynamic reductor are connected with the rotor of the first oil-free twin-screw expander；Generator, the generator are connected with the dynamic reductor.
- 4. gas distributing system overbottom pressure comprehensive generating system according to claim 3, it is characterised in that the natural gas waste cold Power generation sub-system includes：Second oil-free twin-screw expander, the rotor of the second oil-free twin-screw expander are connected to the generator；Condenser, the entrance of the working medium side of the condenser are connected with the gas outlet of the second oil-free twin-screw expander, institute The inlet and outlet for stating the low-temperature receiver side of condenser are respectively connecting to the gas outlet of the first oil-free twin-screw expander and the low pressure Pipeline between natural gas line；Working medium pump, the entrance of the working medium pump are connected with the outlet of the working medium side of the condenser；Evaporator, the entrance of the working medium side of the evaporator are connected with the outlet of the working medium pump, the working medium side of the evaporator Outlet be connected with the air inlet of the second oil-free twin-screw expander, the evaporator is used as thermal source using air.
- 5. gas distributing system overbottom pressure comprehensive generating system according to claim 3, it is characterised in that the lubricating oil subsystem System includes：Grease-box, the grease-box come from the natural gas top pressure power generation subsystem and the natural gas waste cold to collect The high temperature grease of power generation sub-system；Oil pump, the entrance of the oil pump are connected with the outlet of the grease-box；Oil strainer, the entrance of the oil strainer are connected with the outlet of the oil pump；Heat exchanger, the entrance of the lubricating oil side of the heat exchanger are connected with the outlet of the oil strainer；Oil dispenser, the entrance of the oil dispenser are connected with the outlet of the lubricating oil side of the heat exchanger, the oil dispenser To by the distribution of lubrication oil of low temperature to the natural gas top pressure power generation subsystem and the natural gas waste cold power generation sub-system Need the position lubricated.
- 6. gas distributing system overbottom pressure comprehensive generating system according to claim 1, it is characterised in that the monitoring regulator System includes PLC control cabinet and the monitoring device and flow regulator that are connected with the PLC control cabinet by signal wire.
- 7. gas distributing system overbottom pressure comprehensive generating system according to claim 6, it is characterised in that the PLC control cabinet Play Data Detection and regulation and control.
- 8. gas distributing system overbottom pressure comprehensive generating system according to claim 4, it is characterised in that the natural gas waste cold Working medium is low boiling working fluid used by power generation sub-system.
- 9. gas distributing system overbottom pressure comprehensive generating system according to claim 4, it is characterised in that the condenser is plate Formula heat exchanger, the evaporator are a kind of efficient finned radiator.
- 10. gas distributing system overbottom pressure comprehensive generating system according to claim 5, it is characterised in that the heat exchanger is cold But side import and outlet be respectively connecting between the first oil-free twin-screw expander gas outlet and low pressure natural gas pipes Pipeline on, the low-temperature receiver of the heat exchanger is a part of low temperature day after natural gas top pressure power generation subsystem decompression Right gas.
- 11. gas distributing system overbottom pressure comprehensive generating system according to claim 5, it is characterised in that according to required lubrication The pressure of oil, restriction orifice is arranged in the outlet of the oil dispenser.
- 12. gas distributing system overbottom pressure comprehensive generating system according to claim 3, it is characterised in that in the natural gas First flow is set to adjust on pipeline between the outlet of pretreatment unit and the air inlet of the first oil-free twin-screw expander Valve, flowmeter and first pressure transmitter are saved, the monitoring regulation and control subsystem is believed according to the pressure of the first pressure transmitter Number change by the first flow regulation valve regulation high-pressure natural gas air inflow.
- 13. gas distributing system overbottom pressure comprehensive generating system according to claim 10, it is characterised in that in the heat exchanger The entrance of low-temperature receiver side and the gas outlet of the first oil-free twin-screw expander between pipeline on be provided with second flow tune Save valve, be provided with second pressure transmitter and temperature transmitter on the oil dispenser, the monitoring regulation and control subsystem according to The signal intensity of the second pressure transmitter and the temperature transmitter adjusts valve regulation by the second flow and enters institute State the air inflow of the cryogenic natural gas of heat exchanger.
- 14. gas distributing system overbottom pressure comprehensive generating system according to claim 4, it is characterised in that in first nothing Vibrating sensor is respectively arranged on the axle and casing of oily twin-screw expander and the second oil-free twin-screw expander, by described Monitoring regulation and control subsystem is monitored control, when casing vibration values are more than predetermined value, Concatenate shut-down immediately.
- 15. gas distributing system overbottom pressure comprehensive generating system according to claim 5, it is characterised in that the heat exchanger is Plate type heat exchanger.
- 16. the gas distributing system overbottom pressure comprehensive generating system according to any one of claim 1~15, it is characterised in that institute State gas distributing system overbottom pressure comprehensive generating system and make overall skid-mounted formula.
- 17. gas distributing system overbottom pressure comprehensive generating system according to claim 16, it is characterised in that in the skid Detection of natural gas sensor is arranged, regulating and controlling subsystem by the monitoring is monitored control, when concentration of natural gas is more than predetermined value When, Concatenate shut-down immediately.
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| CN107916961B (en) * | 2017-11-16 | 2020-03-24 | 中国科学院广州能源研究所 | Solar energy and natural gas cold energy combined cascade utilization system |
| CN107990146A (en) * | 2017-12-26 | 2018-05-04 | 武汉联合立本能源科技有限公司 | A kind of natural gas pressure regulating door station pressure energy recycles utilization system |
| CN110159373B (en) * | 2019-06-12 | 2021-12-14 | 北京建筑大学 | Heating power device and natural gas anti-freezing and anti-blocking system |
| CN112761732A (en) * | 2021-01-27 | 2021-05-07 | 贵州航天天马机电科技有限公司 | Series screw type natural gas depressurization power generation system |
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