CN105401990B - A kind of pressure energy of natural gas generating regulator and method - Google Patents
A kind of pressure energy of natural gas generating regulator and method Download PDFInfo
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- CN105401990B CN105401990B CN201510818182.8A CN201510818182A CN105401990B CN 105401990 B CN105401990 B CN 105401990B CN 201510818182 A CN201510818182 A CN 201510818182A CN 105401990 B CN105401990 B CN 105401990B
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Classifications
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- 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
Abstract
The present invention provides a kind of pressure energy of natural gas generating regulator and method, regulator includes heating system, expansion power generation system and pressure control portion, the heating system is used to preheat the natural gas of low-pressure pipe network front end, the pressure control portion is used to carry out pressure regulation to the natural gas of low-pressure pipe network front end, the control unit respectively with the heating system and the expansion power generation system communication, adjust pre-warmed temperature by controlling the heating system；And the gas pressure and gas discharge according to low-pressure pipe network front end control the expansion power generation system, until the gas pressure of low-pressure pipe network front end is adjusted to setting value.Regulator of the invention is during the natural gas to high pressure pipe network carries out pressure regulation, pressure energy to natural gas can be reclaimed, the aperture and expanding machine of each valve and the rotating speed of generator are adjusted by control unit, the gas pressure of low-pressure pipe network front end is adjusted to setting level.
Description
Technical field
Can be reclaimed and pressure regulation technology the present invention relates to gas pressure, and in particular to a kind of for industrial hydraulic recovery
Pressure energy of natural gas generating regulator and method.
Background technology
With further going deep into for urbanization, the consumption figure currently as the natural gas of the main naked light energy in city is in substantially
Reveal elevated trend year by year, the gas consumption of China has broken through 1816 billion cubic meters within only 2014.Current natural gas from
Gas field, " West-east Gas pipeline and " Shan-capital two wires " pipeline or LNG gasification station with the High voltage output of 6~10MP, by natural
Gas pipe network is delivered to resident and natural gas of industry user after multi-stage pressure regulating.
For voltage regulating mode, the main pressure regulator using Throttle Principle carries out pressure regulation to natural gas at present, to natural
Gas is compressed, accumulating and utilize during, the abundant pressure energy that high-pressure natural gas itself contain is during pressure regulation by for no reason
Waste, the capacity usage ratio gone out outside burning capacity has to be excavated.
The content of the invention
In view of this, the present invention provides a kind of pressure energy of natural gas generating regulator and method, it is intended to realize natural gas
On the premise of pressure regulation, the pressure energy to natural gas is reclaimed.
The technical solution adopted by the present invention is specially：
A kind of pressure energy of natural gas generating regulator, including heating system, expansion power generation system and pressure control portion, institute
State heating system to be preheated for the natural gas to low-pressure pipe network front end, before the pressure control portion is used for low-pressure pipe network
The natural gas at end carries out pressure regulation, the control unit respectively with the heating system and the expansion power generation system communication, lead to
Cross and control the heating system to adjust pre-warmed temperature；And according to the gas pressure and natural gas of low-pressure pipe network front end
Flow controls the expansion power generation system, until the gas pressure of low-pressure pipe network front end is adjusted to setting value.
In above-mentioned pressure energy of natural gas generating regulator, the heating system includes circulating pump, frequency-variable module, heat exchange
Device and thermal source；Wherein：
The thermal source is connected through circulating pump with the heat exchanger, the heating agent in the thermal source by it is described circulation pumped after
Exchanged heat with natural gas after sending into the heat exchanger；
The pressure control portion sends corresponding frequency adjusting signals according to pre-warmed temperature to the frequency-variable module,
Adjust the flow rate of heat medium of the circulating pump output.
In above-mentioned pressure energy of natural gas generating regulator, the expansion power generation system include valve group and several
Expansion power generation unit in parallel, the valve group includes the second valve, the 3rd valve and each expansion power generation unit front end
First valve, each described expansion power generation unit includes expanding machine and generator, the natural gas of high pressure pipe network through the first valve with
The expanding machine is connected, and the expanding machine is connected with the generator, and natural gas expands and causes expanding machine rotation, further
Electrical power generators are driven, so as to pressure energy be reclaimed；
After pressure energy is reclaimed, after the natural gas of temperature reduction converges in each described expansion power generation unit, successively through institute
State the second valve and the 3rd valve enters low-pressure pipe network.
In above-mentioned pressure energy of natural gas generating regulator, the pressure control portion includes central controller, excitation mould
Block and sensor group, the sensor group include flow sensor, temperature sensor and pressure sensor；Wherein：
Each sensor respectively with the central controller communicate, by the expansion power generation system front end gas discharge,
The natural gas temperature and pressure signal of low-pressure pipe network front end are sent to central controller described in controller；
The central controller is communicated by the excitation module with the generator of each expansion power generation unit, is passed through
Change the exciting current of generator to adjust the rotating speed of the expanding machine and the generator, further regulation low-pressure pipe network front end
Gas pressure；
The valve group is communicated with the central controller respectively, for adjusting entrance by changing the aperture of each valve
The gas discharge of expanding machine, further adjusts the gas pressure of low-pressure pipe network front end.
A kind of pressure regulation method of pressure energy of natural gas generating regulator, pressure sensor and flow sensor respectively will inspections
The natural pressure force signal of the low-pressure pipe network front end for measuring and the natural gas total flow signal of expansion power generation system front end send to
Central controller, central controller is according to the pressure and total flow signal for receiving to the gas pressure of low-pressure pipe network front end
It is adjusted, adjusting method is specially：
If 1) natural gas { pressure set in pressure≤central controller, total flow ＞ system natural gases peak that detect
The design total flow of value }, then central controller gives the second valve sending signal, swollen to ensure by the aperture for reducing the second valve
Swollen operation of electric power system is normal；
If 2) natural gas { pressure set in pressure≤central controller, total flow≤system natural gas peak that detect
The design total flow of value }, then central controller sends to excitation module gradually reduces the control signal of exciter current of generator, makes
The rotating speed for obtaining generator and expanding machine is raised, and along with the rising of rotating speed, is able to by the gas discharge of expansion power generation system
Increase, gas pressure gradually rises, untill the pressure set during the pressure of low-pressure pipe network front end reaches central controller；
If 3) natural gas { pressure set in pressure ＞ central controllers, total flow ＞ system natural gases peak that detect
The design total flow of value }, then on the one hand central controller sends the signal for improving exciter current of generator to excitation module, makes hair
The rotating speed reduction of motor and expanding machine, along with the reduction of rotating speed, is reduced by the gas discharge of expansion power generation system；
On the other hand the signal for reducing its aperture is sent to the second valve, until the gas pressure of low-pressure pipe network front end reaches central control
Untill the pressure of device setting processed；
If 4) natural gas { pressure set in pressure ＞ central controllers, total flow≤system natural gas peak that detect
The design total flow of value }, then central controller sends the control signal for gradually stepping up exciter current of generator to excitation module, makes
The rotating speed reduction of generator and expanding machine, along with the reduction of rotating speed, is increased by the gas discharge of expansion power generation system
Plus, gas pressure reduction, untill the pressure set during the pressure of low-pressure pipe network front end reaches central controller.
In the pressure regulation method of above-mentioned pressure energy of natural gas generating regulator, if the expansion power generation list of expansion power generation system
The group number of unit is m groups, if integer 1<a≤m；In step 2) in, if the now natural gas total flow of expansion power generation system front end
Peak value between { m-a-1, m-a } group expansion power generation unit designs total flow, then central controller (a-1) group expansion thereto
First valve of generator unit sends shutdown signal, closes the first valve of wherein (a-1) group expansion power generation unit front end, while
The control signal for reducing its exciter current of generator is sent to the excitation module of remaining m-a-1 groups expansion power generation unit, makes this
The generator of m-a-1 group expansion power generation units and the rotating speed of expanding machine are raised, along with the rising of rotating speed, by expansion power generation system
The gas discharge of system is increased, and gas pressure is raised, until the gas pressure of low-pressure pipe network front end reaches central control
Untill the pressure set in device processed.
In the pressure regulation method of above-mentioned pressure energy of natural gas generating regulator, if the expansion power generation list of expansion power generation system
The group number of unit is m groups, if integer 1<a≤m；In step 4) in, if the natural gas total flow for now detecting is between { m-a-1, m-
A } group expansion power generation unit peak value design total flow when, central controller on the one hand pass through signal cable (a-1) thereto
First valve of group sends shutdown signal, first valve of wherein (a-1) group is closed, on the other hand, to remaining (m-a-1) group
The excitation module of expansion power generation unit sends the control signal for improving exciter current of generator, (m-a-1) is organized expansion power generation
The rotating speed reduction of the generator and expanding machine of unit, along with the reduction of rotating speed, by the gas discharge of expansion power generation system
It is reduced, gas pressure reduction, until the pressure of low-pressure pipe network front end reaches the pressure position set in central controller.
In the pressure regulation method of above-mentioned pressure energy of natural gas generating regulator, also include：
If during natural gas { pressure set in pressure=central controller, total flow is less than setting value } for detecting, then
Central controller sends shutdown signal to the first valve of the 3rd valve and each expansion power generation unit.
The beneficial effect comprise that：
Generating regulator of the invention reclaims pressure energy of natural gas using expanding machine and generator, and is translated into electricity
Can, it is natural by pressure sensor, flow sensor, excitation module, generator and central controller flexible modulation high pressure pipe network
The pressure of gas simultaneously realizes voltage stabilizing, meets the need of the irregular change of pressure stability and flow of natural gas in low-pressure pipe network
Will, that is, the pressure regulation of high-pressure natural gas is realized, and the pressure energy in high-pressure natural gas has effectively been reclaimed, realize the energy
Efficient utilization；
Before high pressure pipe network natural gas enters expansion power generation system, natural gas is preheated by introducing thermal source, protected
The natural gas temperature for having demonstrate,proved the device port of export meets the requirement of low-pressure pipe network；
Additionally, generating regulator of the invention is compact to design, simple structure, easy to operate and low cost of manufacture can be used
Pressure regulator in the large, medium and small type voltage regulating station in area, pressure regulating box, is particularly suited for medium and small gas pressure regulating station.
Brief description of the drawings
When considered in conjunction with the accompanying drawings, the present invention can more completely be more fully understood.Accompanying drawing described herein is used for providing
A further understanding of the present invention, embodiment and its illustrates, for explaining the present invention, not constitute inappropriate limitation of the present invention.
Fig. 1 be a kind of pressure energy of natural gas generating regulator of the invention structural representation one (heating system be located at it is swollen
Swollen electricity generation system upstream)；
Fig. 2 be a kind of pressure energy of natural gas generating regulator of the invention structural representation two (heating system be located at it is swollen
Swollen electricity generation system downstream).
In figure：
10th, thermal source 11, circulating pump 12, frequency-variable module 13, heat exchanger 14, temperature sensor 15, flow sensor
20th, central controller 21, the first valve 22, expanding machine 23, generator 24, excitation module 25, the second valve the 26, the 3rd
Valve 27, pressure sensor.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to technical scheme.
A kind of pressure energy of natural gas generating regulator as shown in Figure 1, mainly including heating system, expansion power generation system
And pressure control portion, along natural gas airintake direction, the heating system is located at the upstream of the expansion power generation system；Control unit sets
In therebetween, the pressure for adjusting low-pressure pipe network front end；Specifically：
Heating system mainly includes thermal source 10, circulating pump 11, frequency-variable module 12 and heat exchanger 13, and heat exchanger 13 is placed in high pressure
Pipe network natural gas end, thermal source 10 is connected through circulating pump 11 with heat exchanger, and frequency-variable module 12 is communicated with pressure control portion, for controlling
Circulating pump processed 11 changes the flow rate of heat medium for being passed through heat exchanger 13.
The workflow of heating system is：
Heating agent in thermal source 10 sends into heat exchanger 13 and is exchanged heat with natural gas, natural gas is entered after being extracted out by circulating pump 11
Row preheating, the expanded electricity generation system of natural gas after preheating enters low-pressure pipe network；
Expansion power generation system includes several expansion power generation units in parallel, and the group number of expansion power generation unit is true by following formula
It is fixed：
The size of wherein parameter n affects expansion power generation list number of tuples, and n multiplies with single group expansion power generation unit metered flow
Product this is defined herein as single group expansion power generation unit in the corresponding maximum stream flow of power generation performance tolerance interval, and n can be in 1~3 model
Enclose interior value.
The present embodiment includes (first, second, third) expansion cell in parallel, and each expansion cell includes the He of expanding machine 22
Generator 23, the downstream of heat exchanger 13 is provided with the first valve 21, and the outlet of the first valve 21 is with the import of expanding machine 22 by pipe
Road is connected, and expanding machine 22 is connected by shaft coupling with generator 23, and the natural gas after preheating is respectively through each expansion cell
First valve 21 is passed through corresponding expanding machine 22, enters low-pressure pipe network through (second, third) valve (25,26) successively afterwards,
Heating agent after lowering the temperature after heat exchange in heat exchanger 13 returns to thermal source 10 it is heated again, it is ensured that thermal source 10 can be with heat exchanging device 13
Continuously export the heating agent of approximately constant temperature.
The workflow of expansion power generation system is：
Natural gas after being preheated by heat exchanger 13 enters expanding machine 22 through the first valve 21, and natural gas expands and causes expansion
Machine 22 rotates, and is further driven to generator 23 and generates electricity, so as to pressure energy be reclaimed.
Pressure control portion includes the excitation module 24 and main bag that central controller 20, each expansion power generation unit are configured
The sensor group of temperature sensor 14, pressure sensor 27 and flow sensor 15 is included, the expanding machine of each expansion power generation unit
22 outlet is connected to the second valve 25, be respectively arranged on the front end of the second valve 25 and the 3rd valve 26 export, for detecting low pressure
The temperature sensor 14 and pressure sensor 27 of natural gas temperature and pressure are by signal cable and central controller 20 before pipe network
Connection, frequency-variable module 12 communicates respectively with central controller 20 and circulating pump 11, central controller 20 also by signal cable and
The flow sensor 15 detected into the gas discharge before expansion power generation system is connected；Central controller 20 passes through cable connection
There is excitation module 23, excitation module 24 is connected with the generator 23 of expansion power generation system, the second valve 25 and located at second
3rd valve 26 of the outlet of valve 25 is connected by cable with central controller 20 respectively.
The excitation electricity of the excitation signal regulator generator 23 that excitation module 24 sends according to the central controller 20 for receiving
Stream so that the rotating speed of generator 23 and expanding machine 22 changes, and then realize that regulation enters the mesh of the gas discharge of expanding machine 22
's；
The temperature control flow of pressure control portion is：
The natural gas temperature signal that the expanding machine 22 that temperature sensor 14 will be detected is exported is sent to by signal cable
Central controller 20, central controller 20 controls the output frequency of frequency-variable module 12 by signal cable, according to above-mentioned natural gas
Temperature signal, corresponding frequency adjusting signals are sent to frequency converter 12, so that the flow rate of heat medium of the output of circulating pump 11 is adjusted, until
Natural gas temperature after being heated is equal to the default natural gas temperature pre-add heat level of central controller 20.
The Stress control flow of pressure control portion is：
The natural pressure force signal of the low-pressure pipe network front end that pressure sensor 27 will be detected is sent to by signal cable
Central controller 20, the natural gas total flow signal of the expansion power generation system front end that flow sensor 15 will be detected passes through signal
Cable sends central controller 20 to, if：
I) pressure set in the pressure for detecting not higher than central controller 20, the natural gas total flow that detects are
Higher than system natural gas peak value design total flow when, then central controller 20 by signal cable to the second valve 25 send letter
Number, ensure that expansion power generation system operation is normal by way of being gradually reduced the aperture of the second valve 25；
Ii the pressure set in the pressure for) detecting not higher than central controller 20, the natural gas total flow that detects are not
When designing total flow higher than system natural gas peak value, then central controller 20 is sent gradually by signal cable to excitation module 24
The control signal of the exciting current of generator 22 is reduced, is gradually risen along with the rotating speed of generator 23 and expanding machine 22, by swollen
The gas discharge of swollen electricity generation system gradually increases, and gas pressure gradually rises, until the pressure of low-pressure pipe network front end reaches
To the pressure set in central controller 20；If now the natural gas total flow of expansion power generation system front end is between single group
Metered flow × the n of expansion power generation unit × { (2-a), (3-a) } (0≤a≤2) (parameter a is relevant with total flow) group expansion hair
During the peak value design total flow of electric unit, (a-1) of the central controller 20 by signal cable thereto organizes expansion power generation unit
The first valve 21 send shutdown signal, the first valve 21 of wherein (a-1) group expansion power generation unit front end is closed, while to surplus
The excitation module 24 of remaining (2-a) group expansion power generation unit sends the control signal for gradually reducing its exciting current of generator 23,
Gradually rise the generator 23 of (2-a) group expansion power generation unit and the rotating speed of expanding machine 22, by expansion power generation system
Gas discharge increases so that gas pressure is raised, by comprehensive adjustment, until the gas pressure of low-pressure pipe network front end reaches
The stress level set in central controller 20；
Iii the pressure for) detecting is higher than higher than the pressure set in central controller 20, the natural gas total flow for detecting
During system natural gas peak value design total flow, central controller 20 is sent to excitation module 24 by signal cable and improves generator
The signal of 23 exciting currents, generator 23 and the rotating speed of expanding machine 22 are reduced immediately, and gas discharge reduces, meanwhile, ensureing to send out
On the premise of motor 23 and expanding machine 22 are in optimal power generation power, central controller 20 sends to the second valve 25 and is gradually reduced
The signal of the aperture of the second valve 25, until the gas pressure of low-pressure pipe network front end reaches the press water of the setting of central controller 20
It is flat；
IV the pressure for) detecting is not high higher than the pressure set in central controller 20, the natural gas total flow for detecting
When system natural gas peak value designs total flow, central controller 20 is sent to excitation module 24 by signal cable and gradually stepped up
The rotating speed of the control signal of the exciting current of generator 23, generator 23 and expanding machine 22 is gradually reduced, by expansion power generation system
Gas discharge reduce, gas pressure reduction, until the pressure of low-pressure pipe network front end is reached in central controller 20 setting
Stress level；If the natural gas total flow for now detecting is total between the peak value design of { 2-a, 3-a } group expansion power generation unit
During flow, first valve 21 that (a-1) of the one side of central controller 20 by signal cable thereto is organized sends closes
Signal, closes first valve of wherein (a-1) group, and the excitation of expansion power generation unit is on the other hand organized to remaining (2-a)
Module 24 sends the control signal for gradually stepping up the exciting current of generator 23, (2-a) is organized the generator of expansion power generation unit
23 and the rotating speed of expanding machine 22 gradually reduce, reduced by the gas discharge of expansion power generation system, gas pressure reduction is led to
Comprehensive adjustment is crossed, until the pressure of low-pressure pipe network front end reaches the stress level set in central controller 20；
V) if the pressure for detecting is equal to the pressure of setting in central controller and detects day by flow sensor 15
(certain value that can be set lower than in 5~30% of expanding machine flow in single group expansion power generation unit is right gas total flow close to zero
Lower limit, when such as 10%), now central controller 20 is to the 3rd valve 26 and corresponding first valve of each expansion power generation unit
21 send shutdown signal.
Additionally, the thermal source 10 in the present embodiment selects solar energy heating, corresponding heating agent selects hot water, single expansion power generation
The peak value design discharge of unit is 1.5 times of single expansion power generation unit natural gas metered flows, i.e. expansion power generation system peak sets
Meter total flow is 4.5 times of natural gas metered flows of single expansion power generation unit.
As one kind preferably, heat exchanger 13 selects plate type heat exchanger, the first valve 21 and the 3rd valve 26 to select automatically controlled gas
Movable valve, the second valve 25 selects ecp valve, expanding machine 22 to select single-screw expander.
In practice, start first to each operated pneumatic valve for the central controller 20 of pressure-air, open all the first valves
The 21, second valve 25 of door and the 3rd valve 26, whole device enter starting state；Then start circulating pump 10, add heating agent
Circulated in hot systems, it is ensured that the temperature of the detection of temperature sensor 14 reaches the natural temperature set in central controller 20
Degree.
Similarly, as shown in Fig. 2 heating system can also be located at the downstream of expansion power generation system, i.e., located at expansion power generation
Between system and the second valve 25, now the expander outlet of each expansion power generation unit is connected to heat exchanger 13, controls army
The temperature of the natural gas of low-pressure pipe network front end, Stress control principle are similar to, and here is omitted.
To ensure that the natural gas temperature after pressure regulation meets the temperature requirement that low-pressure pipe network receives natural gas, it is necessary to assure thermal source
10 can provide enough heat and heat exchanger 13 enough heat transfer areas.
As described above, being explained to embodiments of the invention, it is clear that as long as essentially without this hair of disengaging
Bright inventive point and effect, will be readily apparent to persons skilled in the art deformation, also be all contained in guarantor of the invention
Within the scope of shield.
Claims (3)
1. a kind of pressure energy of natural gas generating regulator, it is characterised in that including heating system, expansion power generation system and pressure
Control unit, the heating system is used to preheat the natural gas of low-pressure pipe network front end, and it is right that the pressure control portion is used for
The natural gas of low-pressure pipe network front end carries out pressure regulation, the pressure control portion and the heating system and the expansion power generation system
System is communicated respectively, and pre-warmed temperature is adjusted by controlling the heating system；And according to the natural of low-pressure pipe network front end
Atmospheric pressure and gas discharge control the expansion power generation system, until the gas pressure of low-pressure pipe network front end is adjusted
To setting value；Wherein：
1) heating system includes circulating pump, frequency-variable module, heat exchanger and thermal source；Wherein：
The thermal source is connected through the circulating pump with the heat exchanger, the heating agent in the thermal source by it is described circulation pumped after
The heat exchanger is sent into, and is exchanged heat with natural gas in the heat exchanger；
2) the expansion power generation system includes valve group and several expansion power generation units in parallel, wherein：
The valve group includes the second valve, the 3rd valve and is arranged at the first valve of each expansion power generation unit front end
Door；
Each described expansion power generation unit includes expanding machine and generator, and the natural gas of high pressure pipe network is through first valve and institute
State expanding machine to be connected, the expanding machine is connected with the generator；
Natural gas expands and causes expanding machine rotation, by pressure energy conversioning mechanical energy；Expanding machine rotation is further driven to generator rotation
Forwarding electricity, converts mechanical energy into electric energy；So as to the pressure energy of natural gas be reclaimed；And
After pressure energy recovery, after in each described expansion power generation unit, temperature reduction natural gas converges, successively through institute
State the second valve and the 3rd valve enters low-pressure pipe network；
3) pressure control portion includes central controller, excitation module and sensor group, and the sensor group includes flow
Sensor, temperature sensor and pressure sensor；Wherein：
Each sensor is communicated with the central controller respectively, by the gas discharge of the expansion power generation system front end, low
The natural gas temperature of pressure pipe net front end and the natural pressure force signal of low-pressure pipe network front end are sent to the central controller；It is described
Central controller is used for：
31) central controller is communicated by the excitation module with the generator of each expansion power generation unit, is passed through
The exciting current for changing the generator of each expansion power generation unit adjusts the rotating speed of the expanding machine and the generator,
And then adjust the gas pressure of low-pressure pipe network front end；
32) central controller is communicated respectively with each valve in the valve group, for by changing each valve
Aperture enters the gas discharge of the expanding machine to adjust, and then adjusts the gas pressure of low-pressure pipe network front end；
33) central controller is communicated by the frequency-variable module with the circulating pump, according to pre-warmed temperature, by
The frequency-variable module sends corresponding frequency adjusting signals, and then adjusts the flow rate of heat medium of the circulating pump output.
2. a kind of pressure regulation method of pressure energy of natural gas generating regulator, it is characterised in that pressure sensor and flow sensing
Device be respectively used to the low-pressure pipe network front end that will be detected natural pressure force signal and expansion power generation system front end natural gas it is total
Flow signal sends central controller to, and central controller is believed according to the pressure signal for receiving and the total flow
Number, the gas pressure to low-pressure pipe network front end is adjusted, and adjusting method is specially：
If the pressure set in the pressure≤central controller of the natural gas for 1) detecting, and natural gas total flow ＞ systems day
The design total flow of right gas peak value, then central controller give the second valve sending signal, by reduce the aperture of the second valve come
Ensure that expansion power generation system operation is normal；
If the pressure set in the pressure≤central controller of the natural gas for 2) detecting, and natural gas total flow≤system day
The design total flow of right gas peak value, then central controller sends to excitation module gradually reduces the control letter of exciter current of generator
Number, so that the rotating speed of generator and expanding machine is raised, along with the rising of rotating speed, by the gas discharge of expansion power generation system
It is increased, gas pressure gradually rises, until the gas pressure of low-pressure pipe network front end sets in reaching central controller
Stress level untill；
If the pressure set in the pressure ＞ central controllers of the natural gas for 3) detecting, and natural gas total flow ＞ systems day
The design total flow of right gas peak value, then central controller is on the one hand to the letter of excitation module transmission raising exciter current of generator
Number, so that the rotating speed reduction of generator and expanding machine, along with the reduction of rotating speed, by the gas discharge of expansion power generation system
It is reduced；On the other hand central controller sends the signal for reducing its aperture to the second valve, until low-pressure pipe network front end
Untill gas pressure reaches the stress level of central controller setting；
If in the pressure ＞ central controllers of the natural gas for 4) detecting set pressure and, and natural gas total flow≤system
Natural gas peak value designs total flow, then central controller is sent to excitation module by signal cable and gradually steps up generator excitation
The control signal of electric current, so that the rotating speed of generator and expanding machine is gradually reduced, and then makes by the natural of expansion power generation system
Throughput is reduced, gas pressure reduction, until the gas pressure of low-pressure pipe network front end reaches what is set in central controller
Stress level.
3. the pressure regulation method of pressure energy of natural gas generating regulator according to claim 2, it is characterised in that the tune
Pressure method also includes：
If the pressure set in the pressure=central controller of the natural gas for 5) detecting, and natural gas total flow ＜ systems day
The design total flow of right gas peak value, then central controller sent to the first valve of the 3rd valve and each expansion power generation unit
Shutdown signal.
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| CN201510818182.8A CN105401990B (en) | 2015-11-23 | 2015-11-23 | A kind of pressure energy of natural gas generating regulator and method |
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| CN201510818182.8A CN105401990B (en) | 2015-11-23 | 2015-11-23 | A kind of pressure energy of natural gas generating regulator and method |
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| CN105401990B true CN105401990B (en) | 2017-05-31 |
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| 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 |
| BE1028636B1 (en) * | 2020-09-24 | 2022-04-25 | Atlas Copco Airpower Nv | Method and device for expanding a fluid |
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| US11619140B1 (en) | 2022-04-08 | 2023-04-04 | Sapphire Technologies, Inc. | Producing power with turboexpander generators based on specified output conditions |
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| CN103422899B (en) * | 2013-08-09 | 2015-06-03 | 华南理工大学 | Process and device for generating power by pressure energy of small natural gas pipeline network |
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| CN104213939A (en) * | 2014-09-01 | 2014-12-17 | 江苏航天惠利特环保科技有限公司 | A pressure energy-recycling generation device for a natural gas pipe network |
| CN104929776A (en) * | 2015-05-29 | 2015-09-23 | 浙江浙能节能科技有限公司 | Combined cycle power generation system utilizing gas and natural gas pipe network pressure energy |
| CN104975896A (en) * | 2015-07-31 | 2015-10-14 | 北京市燃气集团有限责任公司 | Natural gas pipeline network pressure energy self-control power generation system and self-control method |
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