CN114673566A - Differential pressure power generation device and system for recovering pressure energy of natural gas pipe network - Google Patents
Differential pressure power generation device and system for recovering pressure energy of natural gas pipe network Download PDFInfo
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- CN114673566A CN114673566A CN202210335821.5A CN202210335821A CN114673566A CN 114673566 A CN114673566 A CN 114673566A CN 202210335821 A CN202210335821 A CN 202210335821A CN 114673566 A CN114673566 A CN 114673566A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 244
- 239000003345 natural gas Substances 0.000 title claims abstract description 124
- 238000010248 power generation Methods 0.000 title claims description 48
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 98
- 239000000779 smoke Substances 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 239000003546 flue gas Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 13
- 238000005299 abrasion Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/22—Lubricating arrangements using working-fluid or other gaseous fluid as lubricant
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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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/12—Kind or type gaseous, i.e. compressible
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a differential pressure generating device and a system for recovering pressure energy of a natural gas pipe network, wherein the device comprises: a bearing; the rotating shaft penetrates through the bearing, and a turbine coaxially fixed with the rotating shaft is arranged on the rotating shaft; the generator assembly comprises a motor magnetic rotor arranged on the rotating shaft and a motor stator sleeved outside the rotating shaft, and the motor stator is matched with the motor magnetic rotor in position; a natural gas inlet communicating with a region between the bearing and the shaft and for delivering natural gas towards the turbine to drive the turbine to rotate; and the natural gas outlet is communicated with the area between the bearing and the rotating shaft and is used for discharging the natural gas which drives the turbine to rotate. The natural gas drives the turbine to rotate, so that the magnetic rotor of the motor rotates relative to the stator of the motor, and the pressure energy of the natural gas is converted into electric energy.
Description
Technical Field
The invention belongs to the field of natural gas power generation, and particularly relates to a differential pressure power generation device and system for recovering pressure energy of a natural gas pipe network.
Background
With the rapid development of economy in China, the demand of natural gas is increasing day by day, and in order to improve the efficiency of natural gas pipeline transportation, the natural gas of a natural gas pipeline network always maintains higher pressure in the pipeline transportation process, wherein the pressure is generally about 10MPa and is far higher than the pressure of urban users by 0.4 MPa. The traditional pressure regulating valve device cannot realize energy recovery, and a large amount of waste is caused. The expander is matched with the power generation system to convert the pressure energy into electric energy, and the part of the pressure energy is recycled, so that remarkable economic benefit can be generated, noise and equipment damage hidden danger in the natural gas pressure regulating process can be eliminated, and the expander has important practical significance.
At present, expanders in the process of recovering pressure energy of a natural gas pipe network are mainly star rotary motors and screw expanders. The star rotary pneumatic motor generally adopts a full rolling bearing rotor structure, but generally needs to replace a wear part more than one year. Screw expanders require oil lubrication and are inefficient. The utility model discloses a natural gas pressure difference power generation system, including filtering separator, steam heater, pressure regulating unit and go the combustion engine, the last still parallelly connected turbo expander that is provided with of differential pressure power generation system, filtering separator's inlet end passes through the ESD valve and is connected with the natural gas, filtering separator's exit end and steam heater's entrance connection, steam heater's first exit end and pressure regulating unit entrance connection, steam heater's second exit end and turbo expander's entrance connection, turbo expander's first exit end with go combustion engine entrance connection, turbo expander's second exit end and motor are connected. Although the system can recover the energy originally released by the pressure regulating valve group, the noise pollution and the pipeline vibration generated when the pressure regulating valve group reduces the pressure can be effectively solved, and the working environment is improved, the adopted turbine expander has the problems of frequent replacement of wearing parts and low efficiency.
Therefore, how to provide a technical scheme for recovering the pressure energy of natural gas and reducing the abrasion degree of the device is a technical problem to be solved in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the differential pressure power generation device and the differential pressure power generation system for recovering the pressure energy of the natural gas pipe network, which can convert the pressure energy of the natural gas into electric energy and reduce the abrasion degree of the rotating shaft and the bearing.
In a first aspect, the present invention provides a differential pressure power generation apparatus for recovering pressure energy of a natural gas pipe network, comprising:
a housing;
the pressing plates are used for sealing two ends of the shell;
the rotating assembly comprises a bearing embedded in the shell and a rotating shaft penetrating through the bearing, two ends of the rotating shaft respectively penetrate through the pressing plate, and a turbine coaxial with the rotating shaft is fixed on the rotating shaft;
the generator assembly is positioned in the shell and comprises a motor magnetic rotor arranged on the rotating shaft and a motor stator embedded in the shell, and the motor stator is matched with the motor magnetic rotor in position;
a natural gas inlet in communication with a region between the bearing and the shaft, the natural gas inlet further for delivering natural gas towards the turbine to drive the turbine to rotate;
and the natural gas outlet is communicated with the region between the bearing and the rotating shaft, and the natural gas outlet is also used for discharging and driving the natural gas after the turbine rotates.
Wherein the natural gas inlet comprises a bearing gas inlet and a turbine gas inlet, the bearing gas inlet being in communication with a region between the bearing and the shaft, the turbine gas inlet being for conveying natural gas towards the turbine;
the natural gas export includes bearing gas exhaust port and turbine gas vent, bearing gas exhaust port with regional intercommunication between bearing and the pivot, the turbine gas vent is used for the discharge drive natural gas after the turbine rotates.
The pressure difference power generation device comprises turbine volutes which are the same as the number of the turbines, each turbine volute comprises a first accommodating cavity for accommodating the turbine and an outlet pipe communicated with the first accommodating cavity, the first accommodating cavity is communicated with the natural gas inlet, and the outlet pipe is communicated with the natural gas outlet.
The turbine volute is cylindrical, one cylindrical end of the turbine volute is bent inwards to form an annular second accommodating cavity, the second accommodating cavity is communicated with the first accommodating cavity, and a plurality of nozzles communicated with the first accommodating cavity and the second accommodating cavity are arranged between the cylindrical bent inwards end and the pressure plate;
the second accommodating cavity is communicated with the natural gas inlet and is used for accommodating natural gas;
the nozzle is arranged along the circumferential direction of the second accommodating cavity and faces the turbine, so that the sprayed natural gas pushes the turbine to rotate.
The turbine volute is characterized in that a sealing plate is arranged on one side, bent inwards, of the turbine volute, the outlet pipe is fixed on the sealing plate, and the axis of the outlet pipe coincides with the axis of the turbine;
the turbine comprises a plurality of blades arranged along the circumferential direction of the turbine, an arc-shaped flow channel is arranged between the blades, one end of the arc-shaped flow channel is arranged at the inlet along the radial direction of the turbine, the other end of the arc-shaped flow channel is arranged at the outlet along the axial direction of the turbine, and the turbine is used for changing the natural gas sprayed from the nozzle along the radial direction of the turbine into the natural gas along the axial direction of the turbine.
One end of the rotating shaft is provided with a thrust disc which is coaxial with the rotating shaft, the thrust disc is positioned in the bearing, and the diameter of the thrust disc is larger than that of the rotating shaft;
the bearing includes the edge hybrid bearing, thrust bearing and the journal bearing that the pivot axial set gradually, hybrid bearing and thrust bearing are located the one end of pivot, and be located respectively the thrust disc both sides, the journal bearing is located the other end of pivot, be equipped with between thrust bearing and journal bearing motor stator.
The shell is provided with a mixed bearing air inlet pipe, a thrust bearing air inlet pipe and a radial bearing air inlet pipe which are respectively communicated with a mixed bearing, a thrust bearing and a radial bearing, and the mixed bearing air inlet pipe, the thrust bearing air inlet pipe and the radial bearing air inlet pipe are all communicated with the natural gas inlet;
a mixing channel, a thrust channel and a radial channel which are communicated with the mixing bearing air inlet pipe, the thrust bearing air inlet pipe and the radial bearing air inlet pipe are respectively arranged in the mixing bearing, the thrust bearing and the radial bearing, the mixing channel is provided with two air outlets, one air outlet faces one side of the thrust disc, the other air outlet faces the rotating shaft, the air outlet of the thrust channel faces the other side of the thrust disc, and the air outlet of the radial channel faces the rotating shaft;
the shell is provided with a bearing gas exhaust pipe communicated with the interior of the shell, and the bearing gas exhaust pipe is communicated with the natural gas outlet.
Wherein, hybrid bearing, thrust bearing and journal bearing's the outside all is equipped with annular holding tank, hold tank bottom with hybrid bearing intake pipe, thrust bearing intake pipe and journal bearing intake pipe intercommunication, the opening of holding tank support hold in inside the casing, so that the holding tank with the casing forms the sealed district that holds the natural gas, the opening of holding tank is for reducing the structure to its bottom.
The rotating shaft is internally provided with a hollow structure, and the middle part of the rotating shaft is fixed with the motor magnetic rotor and a motor rotor protective sleeve wrapped outside the motor magnetic rotor.
In a second aspect, the present invention further provides a differential pressure power generation system for recovering pressure energy in a natural gas pipeline network, comprising:
the above-described differential pressure power generation device;
a natural gas thermoelectric device in communication with the natural gas outlet;
the electric energy output end is connected with the generator assembly.
The differential pressure power generation system comprises a natural gas pipe, a smoke exhaust pipe and a preheater;
the natural gas pipe conveys natural gas towards the turbine through a turbine gas path, and is also communicated with the region between the bearing and the rotating shaft through a bearing gas path;
the smoke exhaust pipe is communicated with the natural gas thermoelectric device through a smoke gas circuit;
the turbine gas circuit and the smoke gas circuit both penetrate through the preheater.
Compared with the prior art, the natural gas drives the turbine to rotate, so that the magnetic rotor of the motor rotates relative to the stator of the motor, and the pressure energy of the natural gas is converted into electric energy. According to the invention, the natural gas inlet is communicated with the area between the bearing and the rotating shaft, so that the rotating shaft is in an air floating state when working and cannot be contacted with the bearing, thereby avoiding the abrasion condition and the risk of oil pollution during oil lubrication; and the rotating speed of the rotating shaft in the air floatation state can be very high, and the electric energy conversion efficiency at high speed is higher. In addition, because the gas used when the rotating shaft is in air floatation is high-pressure natural gas which is the same working medium and drives the turbine to rotate, an air source does not need to be prepared separately for air floatation of the rotating shaft, and the mutual pollution can not occur.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic structural diagram illustrating a differential pressure power generation device for recovering pressure energy of a natural gas pipeline network according to an embodiment of the invention;
fig. 2 is a schematic structural view showing a rotor portion according to an embodiment of the present invention;
fig. 3 is a schematic structural view showing a stator portion according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a pressure differential power generation system for natural gas pipeline pressure energy recovery according to an embodiment of the present invention.
Description of reference numerals: 1-rotor part, 11-turbine, 111-first turbine, 112-second turbine, 12-shaft, 121-first spindle part, 122-second spindle part, 13-magnetic rotor of electric machine, 14-rotor protective sleeve of electric machine, 15-thrust disk, 2-stator part, 211-first turbine inlet pipe, 212-first turbine outlet pipe, 213-second turbine inlet pipe, 214-second turbine outlet pipe, 22-turbine volute, 221-first turbine volute, 222-second turbine volute, 223-nozzle, 224-first nozzle, 225-second nozzle, 226-first receiving chamber, 227-second receiving chamber, 23-pressure plate, 231-first pressure plate, 232-second pressure plate, 24-housing, 251-hybrid bearing intake duct, 252-thrust bearing intake duct, 253-radial bearing intake duct, 26-bearing, 261-hybrid bearing, 262-thrust bearing, 263-radial bearing, 264-bearing gas exhaust duct, 27-motor stator, 31-bearing gas intake port, 32-turbine gas intake port, 321-first turbine gas intake port, 322-second turbine gas intake port, 41-bearing gas exhaust port, 42-turbine gas exhaust port, 421-first turbine gas exhaust port, 422-second turbine gas exhaust port, 5-natural gas duct, 61-bypass throttle valve, 62-turbine gas regulating valve, 63-bearing gas regulating valve, 64-preheater, 7-inverter, 8-differential pressure power generation device, 9-natural gas thermoelectric device, 91-smoke exhaust pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present embodiment provides a pressure difference power generation device for recovering pressure energy of a natural gas pipeline network, which drives a motor magnetic rotor 13 to generate power through rotation of a turbine 11 when generating power, wherein the number of the turbine 11 can be selected according to actual conditions. In this embodiment, taking two turbines 11 disposed at two ends of a rotating shaft 12 as an example, the differential pressure power generation device may specifically include: the stator comprises a rotor part 1, a stator part 2, a natural gas inlet and a natural gas outlet, wherein the natural gas inlet comprises a bearing gas inlet 31 and a turbine gas inlet 32, the natural gas outlet comprises a bearing gas exhaust port 41 and a turbine exhaust port 42, preferably, the turbine gas inlet 32 comprises a first turbine gas inlet 321 and a second turbine gas inlet 322, and the turbine exhaust port 42 comprises a first turbine exhaust port 421 and a second turbine exhaust port 422.
Referring to fig. 2, the rotor portion 1 in the present embodiment may specifically include: the turbine 11, the rotating shaft 12, the motor magnetic rotor 13, the motor rotor protective sleeve 14 and the thrust disc 15, wherein the turbine 11 comprises a first turbine 111 and a second turbine 112, and the rotating shaft 12 comprises a first main shaft part 121 and a second main shaft part 122. The various parts of the rotor section 1 are coaxially arranged.
In practical application, the motor magnetic rotor 13 of the present embodiment is disposed between the first spindle portion 121 and the second spindle portion 122, and is completely covered by the motor rotor protection sleeve 14, so as to avoid the motor magnetic rotor 13 from being broken due to centrifugal force when rotating at high speed. Preferably, the first main shaft part 121 and the second main shaft part 122 can adopt a hollow structure design, so as to reduce the weight of the shaft system and improve the rotor dynamic characteristics of the shaft system. The present embodiment is provided with a thrust disc 15 on the main shaft second part 122. The first turbine 111 and the second turbine 112 are respectively disposed on both sides of the rotor portion 1 (the rotary shaft 12). Preferably, the first turbine 111 and the second turbine 112 are identical mirror-symmetrical designs (the flow channels of the turbines 11 are identical, but the rotation directions are opposite), and the axial thrust generated on the turbines 11 is equal in magnitude and opposite in direction, so that the load of the thrust disc 15 can be greatly reduced.
The bearing gas and the turbine gas in the embodiment both adopt pressurized natural gas, so that the condition of mutual pollution can not occur when the rotor part 1 rotates.
Referring to fig. 3, the stator portion 2 in the present embodiment may specifically include: the turbine volute 22 comprises a first turbine volute 221 and a second turbine volute 222, the inlet pipes comprise a first turbine outlet pipe 212 and a second turbine outlet pipe 214, the pressure plate 23 comprises a first turbine inlet pipe 211, a nozzle 223, a pressure plate 23, a radial bearing inlet pipe 253, the casing 24, a thrust bearing inlet pipe 252, a mixed bearing inlet pipe 251, a second turbine inlet pipe 213, a bearing 26, a bearing gas exhaust pipe 264 and the motor stator 27, wherein the turbine volute 22 comprises the first turbine volute 221 and the second turbine volute 222, the inlet pipes comprise the first turbine outlet pipe 212 and the second turbine outlet pipe 214, the pressure plate 23 comprises a first pressure plate 231 and a second pressure plate 232, the nozzle 223 comprises a first nozzle 224 and a second nozzle 225, and the bearing 26 comprises a mixed bearing 261, a thrust bearing 262 and a radial bearing 263. Bearing air exhaust 264 communicates through the housing 24 to the area between the bearings 26 and the shaft 12. The motor magnetic rotor 13 of the rotor part 1 forms a generator assembly with the motor stator 27 of the stator part 2, preferably with the motor stator 27 coinciding with the plane of symmetry of the motor magnetic rotor 13.
In practical application scenarios, the first turbine volute 221, the first pressure plate 231, the casing 24, the second pressure plate 232, the second turbine volute 222, the hybrid bearing 261, the thrust bearing 262, the motor stator 27, and the radial bearing 263 of the present embodiment are coaxially disposed. Preferably, a hybrid bearing 261 and a radial bearing 263 for generating radial bearing force are respectively arranged at two ends of the rotating shaft 12, so as to obtain better rotor dynamic characteristics. The thrust bearing 262 and the hybrid bearing 261 which generate axial bearing force are distributed on two sides of the thrust disc 15, axial air outlets of the thrust bearing 262 and the hybrid bearing 261 are air outlet towards the thrust disc 15, and an air outlet of the radial bearing 263 is air outlet towards the rotating shaft 12.
Naturally, the bearing air inlet 31 is communicated with the radial bearing air inlet pipe 253, the thrust bearing air inlet pipe 252 and the mixed bearing air inlet pipe 251, the bearing air outlet 41 is communicated with the bearing air outlet pipe 264, the first turbine air inlet 321 is communicated with the first turbine inlet pipe 211, the second turbine air inlet 322 is communicated with the second turbine inlet pipe 213, the first turbine air outlet 421 is communicated with the first turbine 111 outlet pipe, and the second turbine air outlet 422 is communicated with the second turbine 112 outlet pipe.
During operation, high-pressure bearing gas (natural gas) enters the differential pressure power generation device from the radial bearing gas inlet pipe 253, the thrust bearing gas inlet pipe 252 and the mixed bearing gas inlet pipe 251, and forms a gas film and a bearing capacity on the surface of the first main shaft part 121, the surface of the corresponding side of the thrust disc 15, the second main shaft part 122 and the surface of the other side of the thrust disc 15 through gas outlets of the radial bearing 263, the thrust bearing 262 and the mixed bearing 261. All of the bearing 26 gas that has been depressurized finally exits the pressure differential power plant through the bearing gas exhaust 264. After the bearing system (the structure formed by the bearing 26 and the rotating shaft 12) normally works, high-pressure working gas (the same as the bearing gas) enters the first turbine volute 221 through the first turbine inlet pipe 211, passes through the first nozzle 224, converts pressure energy into velocity energy, and then enters the first turbine 111 to push the rotor part 1 to rotate, so that the velocity energy is converted into mechanical energy for the rotor part 1 to rotate; the rotating rotor portion 1 rotates the magnetic rotor 13 of the motor therein and generates an induced current in the stator 27 of the motor to convert the mechanical energy of the rotor rotation into electrical energy. The other path of working gas enters the second turbine inlet pipe 213 similarly. It should be noted that the working gas pushes the first turbine 111 and the second turbine 112 to rotate in the same direction, and together drives the rotor portion 1 to rotate in the same direction. Wherein, the first and second turbine volutes 221 and 222 each include a first accommodating chamber 226 accommodating the turbine 11 and a second accommodating chamber 227 bent inward to form a ring shape, the first accommodating chamber 226 is communicated with the first or second turbine 111 or 112 discharge pipe, the second accommodating chamber 227 is communicated with the first or second turbine inlet pipe 211 or 213, and the second accommodating chamber 227 is communicated with the first accommodating chamber 226 through the first or second nozzle 224 or 225.
Although the embodiment of the invention adopts the technology of dynamic pressure gas bearing, the bearing can work without additionally providing a gas source for the bearing. By adding the air bag, when the rotating assembly is started and stopped, a certain amount of air can be supplied to the bearing, so that friction loss is avoided.
The technical scheme provided by the invention is essentially a pressure energy recovery device based on a static pressure gas bearing. The purpose is to utilize the pressure energy and the heat energy of the high-pressure gas to drive the turbine 11 and the rotating shaft 12 to rotate, and further drive the generator assembly arranged on the rotating shaft 12 to generate electric energy, namely, the pressure energy is converted into the electric energy. The present invention is characterized in that a certain amount of gas is always supplied to the bearing 26 for providing the support of the air flotation for the rotating shaft 12, and compared with the traditional dynamic pressure gas bearing, the present invention has the advantages of more reliability, no abrasion and larger bearing capacity.
Referring to fig. 4, an embodiment of the present invention further provides a differential pressure power generation system for recovering pressure energy of a natural gas pipe network, where the differential pressure power generation system is mainly used in a natural gas power plant, and specifically may include: the natural gas pipeline 5, a bypass throttle valve 61, a turbine gas regulating valve 62, a bearing gas regulating valve 63, a preheater 64, an inverter 7, a differential pressure generating device 8, a natural gas thermoelectric device 9 and a smoke exhaust pipeline 91. Wherein the natural gas pipe 5 is used for transporting high-pressure natural gas.
In a practical application scenario, the differential pressure power generation system of the embodiment may include four gas paths: the device comprises a bearing gas path, a bypass gas path, a turbine gas path and a smoke gas path. Specifically, the bearing gas circuit is composed of a natural gas pipe 5, a bearing gas regulating valve 63, a bearing gas inlet 31 of the differential pressure power generation device 8, a bearing gas exhaust port 41 of the differential pressure power generation device 8 and a natural gas thermoelectric device 9 which are sequentially communicated, the bypass gas circuit is composed of the natural gas pipe 5, a bypass throttle valve 61 and the natural gas thermoelectric device 9 which are sequentially communicated, the turbine gas circuit is composed of the natural gas pipe 5, a turbine gas regulating valve 62, a preheater 64, a turbine gas inlet 32 of the differential pressure power generation device 8, a turbine exhaust port 42 of the differential pressure power generation device 8 and the natural gas thermoelectric device 9 which are sequentially communicated, and the flue gas circuit is composed of the natural gas thermoelectric device 9, the preheater 64 and a flue gas exhaust pipe 91 which are sequentially communicated.
When the differential pressure power generation system of the embodiment works, the differential pressure power generation system can be divided into the following steps:
natural gas is channeled to the area between the bearing 26 and the shaft 12 via the bearing air passages. And opening the bearing gas regulating valve 63, introducing the high-pressure natural gas in the natural gas pipe 5 into the bearing gas path, and entering the bearing system of the differential pressure generating device 8 to suspend the rotor part 1.
Natural gas is transported through the turbine gas path towards the turbine 11. The turbine gas regulating valve 62 is opened, high-pressure natural gas in the natural gas pipe 5 is introduced into a turbine gas circuit, is preheated by the preheater 64, then enters the differential pressure power generation device 8 and acts on the turbine 11 to convert pressure energy into electric energy, and the natural gas which comes out of the differential pressure power generation device 8 is not low in temperature due to preheating and can directly enter the natural gas thermoelectric device 9.
And introducing the natural gas in the bearing gas path and the turbine gas path through the differential pressure power generation device 8 into the natural gas thermoelectric device 9 for power generation.
The present embodiment may also introduce natural gas directly into the natural gas thermoelectric device 9 through the bypass gas path. That is, in the present embodiment, the opening degree of the bypass throttle valve 61 is adjusted, so as to introduce the high-pressure natural gas in the natural gas pipe 5 into the bypass gas path, so as to achieve the purpose of keeping the pressure difference power generation device 8 stably operating.
The natural gas of the embodiment enters the natural gas thermoelectric device 9 through the bearing gas path, the bypass gas path and the turbine gas path to perform conventional combustion power generation, and then generates hot flue gas, and the generated hot flue gas enters the preheater 64 to preheat the high-pressure natural gas in the turbine gas path, so that the temperature of the natural gas in the turbine gas path after differential pressure power generation is prevented from being too low; meanwhile, after the flue gas in the flue gas path passes through the preheater 64, the temperature is reduced, a large amount of moisture in the flue gas is separated out, and meanwhile, harmful substances in the flue gas are separated out together with the moisture, so that pollutants are prevented from being discharged to the atmosphere from the smoke discharge pipe 91, and the purpose of 'flue gas whitening' can be realized.
The frequency of the electric energy generated by the differential pressure power generation device 8 in the working process of the embodiment is related to the rotating speed of the rotor part 1, and if the power needs to be connected with the natural gas thermoelectric device 9 together, the inverter 7 is also needed to convert the frequency of the electricity generated by the differential pressure power generation device 8 into 50 Hz; in addition, the differential pressure power generation device 8 of the present embodiment may be directly connected to an electric energy storage device.
The foregoing describes preferred embodiments of the present invention, and is intended to provide a clear and concise description of the spirit and scope of the invention, and not to limit the same, but to include all modifications, substitutions, and alterations falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a pressure differential power generation facility for natural gas pipe network pressure energy recuperation which characterized in that includes:
a housing;
the pressing plates are used for sealing two ends of the shell;
the rotating assembly comprises a bearing embedded in the shell and a rotating shaft penetrating through the bearing, two ends of the rotating shaft respectively penetrate through the pressing plate, and a turbine coaxial with the rotating shaft is fixed on the rotating shaft;
the generator assembly is positioned in the shell and comprises a motor magnetic rotor arranged on the rotating shaft and a motor stator embedded in the shell, and the motor stator is matched with the motor magnetic rotor in position;
a natural gas inlet in communication with a region between the bearing and the shaft, the natural gas inlet further for delivering natural gas towards the turbine to drive the turbine to rotate;
and the natural gas outlet is communicated with the region between the bearing and the rotating shaft, and is also used for discharging and driving the natural gas after the turbine rotates.
2. The differential pressure power generation apparatus of claim 1, wherein the natural gas inlet comprises a bearing gas inlet and a turbine gas inlet, the bearing gas inlet communicating with a region between the bearing and the shaft, the turbine gas inlet for transporting natural gas toward the turbine;
the natural gas export includes bearing gas exhaust port and turbine gas vent, bearing gas exhaust port with regional intercommunication between bearing and the pivot, the turbine gas vent is used for the discharge drive natural gas after the turbine rotates.
3. The pressure differential generating apparatus according to claim 1, wherein the pressure differential generating apparatus comprises a number of turbine volutes equal to the number of the turbines, the turbine volutes comprising a first accommodating chamber accommodating the turbines and an outlet pipe communicating with the first accommodating chamber, the first accommodating chamber communicating with the natural gas inlet, and the outlet pipe communicating with the natural gas outlet.
4. The pressure difference power generation device as claimed in claim 3, wherein the turbine volute is cylindrical, and one end of the turbine volute is bent inwards to form a second annular accommodating cavity, the second accommodating cavity is communicated with the first accommodating cavity, and a plurality of nozzles communicated with the first accommodating cavity and the second accommodating cavity are arranged between the end of the turbine volute bent inwards and the pressure plate;
the second accommodating cavity is communicated with the natural gas inlet and is used for accommodating natural gas;
the nozzle is arranged along the circumferential direction of the second accommodating cavity and faces the turbine, so that the sprayed natural gas pushes the turbine to rotate.
5. The pressure differential generating apparatus as claimed in claim 4, wherein a sealing plate is provided on the inwardly bent side of the turbine volute, the outlet pipe is fixed to the sealing plate, and the outlet pipe coincides with the axis of the turbine;
the turbine comprises a plurality of blades arranged along the circumferential direction of the turbine, an arc-shaped flow channel is arranged between the blades, one end of the arc-shaped flow channel is arranged at the inlet along the radial direction of the turbine, the other end of the arc-shaped flow channel is arranged at the outlet along the axial direction of the turbine, and the turbine is used for changing the natural gas sprayed from the nozzle along the radial direction of the turbine into the natural gas along the axial direction of the turbine.
6. The pressure differential generating apparatus of claim 1, wherein the shaft has a thrust disk disposed coaxially therewith at one end, the thrust disk being located within the bearing, and the diameter of the thrust disk being greater than the diameter of the shaft;
the bearing includes the edge hybrid bearing, thrust bearing and the journal bearing that the pivot axial set gradually, hybrid bearing and thrust bearing are located the one end of pivot, and be located respectively the thrust disc both sides, journal bearing is located the other end of pivot, be equipped with between thrust bearing and journal bearing motor stator.
7. The differential pressure power generation device as claimed in claim 6, wherein the casing is provided with a hybrid bearing air inlet pipe, a thrust bearing air inlet pipe and a radial bearing air inlet pipe which are respectively communicated with the hybrid bearing, the thrust bearing and the radial bearing, and the hybrid bearing air inlet pipe, the thrust bearing air inlet pipe and the radial bearing air inlet pipe are all communicated with the natural gas inlet;
a mixing channel, a thrust channel and a radial channel which are communicated with the mixing bearing air inlet pipe, the thrust bearing air inlet pipe and the radial bearing air inlet pipe are respectively arranged in the mixing bearing, the thrust bearing and the radial bearing, the mixing channel is provided with two air outlets, one air outlet faces one side of the thrust disc, the other air outlet faces the rotating shaft, the air outlet of the thrust channel faces the other side of the thrust disc, and the air outlet of the radial channel faces the rotating shaft;
the shell is provided with a bearing gas exhaust pipe communicated with the interior of the shell, and the bearing gas exhaust pipe is communicated with the natural gas outlet.
8. The differential pressure power generation device as claimed in claim 6, wherein annular accommodating grooves are formed in the outer sides of the hybrid bearing, the thrust bearing and the radial bearing, the bottom of each accommodating groove is communicated with the air inlet pipe of the hybrid bearing, the air inlet pipe of the thrust bearing and the air inlet pipe of the radial bearing, and an opening of each accommodating groove abuts against the inside of the casing, so that a sealed space for accommodating natural gas is formed between each accommodating groove and the casing.
9. A pressure differential power generation system for natural gas pipe network pressure energy recovery, comprising:
the differential pressure power generation device of claims 1-8;
a natural gas thermoelectric device in communication with the natural gas outlet;
the electric energy output end is connected with the generator assembly.
10. The differential pressure power generation system of claim 9, wherein the differential pressure power generation system comprises a natural gas pipe, a flue gas pipe, and a preheater;
the natural gas pipe conveys natural gas towards the turbine through a turbine gas path, and is also communicated with the region between the bearing and the rotating shaft through a bearing gas path;
the smoke exhaust pipe is communicated with the natural gas thermoelectric device through a smoke gas circuit;
the turbine gas circuit and the smoke gas circuit both penetrate through the preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210335821.5A CN114673566A (en) | 2022-03-31 | 2022-03-31 | Differential pressure power generation device and system for recovering pressure energy of natural gas pipe network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210335821.5A CN114673566A (en) | 2022-03-31 | 2022-03-31 | Differential pressure power generation device and system for recovering pressure energy of natural gas pipe network |
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| CN114673566A true CN114673566A (en) | 2022-06-28 |
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| CN202210335821.5A Pending CN114673566A (en) | 2022-03-31 | 2022-03-31 | Differential pressure power generation device and system for recovering pressure energy of natural gas pipe network |
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| US20170198583A1 (en) * | 2004-12-07 | 2017-07-13 | ReCoGen, LLC | Turbine Engine |
| CN101016857A (en) * | 2007-02-12 | 2007-08-15 | 西安交通大学 | Liquefied natural gas double-driving automobile circulatory system based on opening Rankine cycle |
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Application publication date: 20220628 |