CN214091968U - Natural gas pressure energy power generation and storage system - Google Patents

Abstract

The utility model discloses a natural gas pressure energy electricity generation energy storage system, include: the system comprises an expander, a generator and an energy storage assembly, wherein the generator is connected with the expander; the energy storage assembly comprises an energy storage battery, an electricity storage device and a discharging device, the electricity storage device is connected with the generator, and the energy storage battery is respectively connected with the electricity storage device and the discharging device. According to the utility model discloses natural gas pressure energy power generation energy storage system can improve energy utilization.

Description

Natural gas pressure energy power generation and storage system

Technical Field

The utility model relates to an energy conversion technology field, in particular to natural gas pressure energy electricity generation energy storage system.

Background

At present, a natural gas pressure energy recovery power generation system mostly adopts a power generation grid connection or network connection mode to consume electric energy. However, in view of the current application situation of the pressure energy power generation system of the domestic natural gas pressure regulating station, most stations still cannot be used for power generation and network surfing due to local policy restrictions or cannot meet the grid-connected self-use requirement due to low self-electricity utilization load of a plant area where a project is located, so that the pressure energy power generation equipment cannot be well popularized and applied.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a natural gas pressure energy electricity generation energy storage system can improve energy utilization.

According to the utility model discloses natural gas pressure energy power generation energy storage system, include: the system comprises an expander, a generator and an energy storage assembly, wherein the generator is connected with the expander; the energy storage assembly comprises an energy storage battery, an electricity storage device and a discharging device, the electricity storage device is connected with the generator, and the energy storage battery is respectively connected with the electricity storage device and the discharging device.

According to the utility model discloses natural gas pressure energy power generation energy storage system can improve energy utilization.

In addition, according to the utility model discloses natural gas pressure energy electricity generation energy storage system of above-mentioned embodiment can also have following additional technical characterstic:

optionally, the power storage device comprises: the alternating current contactor comprises a first joint, a second joint and a third joint, and the first joint selectively connects the second joint and the third joint; the resistance box is connected with the second joint; the rectifier is respectively connected with the third joint and the energy storage battery, wherein the first joint is connected with the generator.

Optionally, the energy storage assembly further comprises: an energy management system and a PLC controller. The energy management system is respectively connected with the rectifier and the discharging device; and the PLC is respectively connected with the energy management system and the alternating current contactor.

Optionally, the discharge device comprises: the inverter is connected with the energy storage battery.

Optionally, the energy storage assembly is detachably connected to the generator.

Optionally, the system further comprises: the moving device is suitable for driving the energy storage assembly to move, and the energy storage assembly is installed on the moving device.

Optionally, the system further comprises: the expansion machine comprises a first pipeline assembly, a heat exchange pipeline assembly and a heat exchanger, wherein both ends of the first pipeline assembly are respectively connected with an air inlet pipe and an air outlet pipe, and the expansion machine is connected in series with the first pipeline assembly; the heat exchange pipeline assembly is connected with the first pipeline assembly in parallel, and the heat exchange pipeline assembly is connected to the downstream of the expansion machine; the heat exchanger comprises a first heat exchange part and a second heat exchange part, the first heat exchange part and the second heat exchange part are matched and suitable for heat transfer, the first heat exchange part is connected in series with the heat exchange pipeline assembly, and the second heat exchange part is used for introducing a heat exchange medium.

Optionally, the system further comprises: the two ends of the second pipeline assembly are respectively connected with the air inlet pipe and the air outlet pipe, and the first pipeline assembly is connected with the second pipeline assembly in parallel; a valve assembly connected to the first and second conduit assemblies, respectively, the valve assembly being configured to control the intake pipe and the first conduit assembly to be turned on or off and the intake pipe and the second conduit assembly to be turned on or off.

Optionally, the valve assembly includes a first shut-off valve and a second shut-off valve, the first shut-off valve being connected in series with the first pipeline assembly, the second shut-off valve being connected in series with the second pipeline assembly.

Drawings

Fig. 1 is a schematic diagram of an energy storage assembly according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a natural gas pressure regulating system according to an embodiment of the present invention.

Reference numerals: the expansion machine 10, the generator 11, the energy storage assembly 200, the energy storage battery 210, the ac contactor 221, the resistance box 222, the rectifier 223, the inverter 230, the energy management system 240, the PLC controller 250,

Detailed Description

The utility model belongs to natural gas pressure energy electricity generation recovery field is the integrated equipment scheme that utilizes natural gas pressure energy to retrieve energy storage equipment and retrieve the energy storage with the natural gas at the extravagant pressure energy of pressure regulating in-process. At present, a natural gas pressure energy recovery power generation system mostly adopts a power generation grid connection or network connection mode to consume electric energy. However, in view of the current application situation of the pressure energy power generation system of the domestic natural gas pressure regulating station, most stations still cannot be used for power generation and network surfing due to local policy restrictions or cannot meet the grid-connected self-use requirement due to low self-electricity utilization load of a plant area where a project is located, so that the pressure energy power generation equipment cannot be well popularized and applied. Through the utility model provides a natural gas pressure energy electricity generation energy storage system then can this problem of effectual solution.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

With reference to fig. 1 and fig. 2, according to the utility model discloses natural gas pressure energy electricity generation energy storage system includes: expander 10, generator 11 and energy storage assembly 200. The expander 10 is used for converting pressure energy into mechanical energy, the generator 11 is used for converting mechanical energy into electrical energy, the energy storage assembly 200 is used for storing the electrical energy converted by the generator 11, and the energy storage assembly 200 is used for releasing the electrical energy stored in the energy storage assembly 200.

Specifically, the generator 11 is connected to the expander 10, and the mechanical energy generated during the operation of the expander 10 drives the generator 11 to generate electricity. The energy storage assembly 200 includes an energy storage battery 210, an electricity storage device, and a discharge device, wherein the energy storage motor is adapted to store electric energy, the electricity storage device is adapted to transmit the electric energy obtained by the conversion of the generator 11 to the energy storage battery 210 for storage, the discharge device is adapted to release the electric energy stored by the energy storage battery 210, the electricity storage device is connected to the generator 11, and the energy storage battery 210 is connected to the electricity storage device and the discharge device, respectively.

According to the utility model discloses natural gas pressure energy electricity generation energy storage system through setting up expander 10, converts the pressure energy in the gas transportation process into the electric energy, can be applied to natural gas pressure regulating system's daily operation with the electric energy, but also can be used for other usage with unnecessary electric energy, for example, with the unnecessary electric energy transmission for use in the electric wire netting, consequently, the utility model provides a pressure energy in the natural gas transportation process can be retrieved to the natural gas pressure regulating system, and is energy-concerving and environment-protective. The energy storage assembly 200 can store unused electric energy and release the electric energy at a certain time and place to provide electric energy, so that the energy utilization rate can be improved.

The energy storage assembly 200 of the present invention can have different forms, and only the electric energy generated by the generator 11 needs to be transmitted to the electric storage device. The utility model provides a power storage device of specific embodiment.

As shown in fig. 1, in some embodiments of the present invention, the power storage device includes: the alternating current contactor 221, the resistor box 222 and the rectifier 223, wherein the alternating current contactor 221 comprises a first joint, a second joint and a third joint, and the first joint selectively connects the second joint and the third joint; the resistance box 222 is connected to the second connector; the rectifier 223 is connected to the third connection and the energy storage cell 210, respectively, wherein the first connection is connected to the generator 11. Therefore, the stability and the safety of the power storage device can be effectively improved, and the performance of the power storage device is effectively improved.

Optionally, the energy storage assembly 200 further comprises: an energy management system 240 and a PLC controller 250. The energy management system 240 is connected to the rectifier 223 and the discharge device, respectively; the PLC controller 250 is connected to the energy management system 240 and the ac contactor 221, respectively. The energy storage assembly 200 can be controlled by the energy management system 240, so that the stability and the safety of the energy storage assembly 200 are further effectively improved.

Optionally, in some embodiments of the present invention, the discharge device comprises: the inverter 230, the inverter 230 is connected with the energy storage battery 210.

Optionally, the energy storage assembly 200 is detachably connected to the generator 11. Therefore, the influence of the connecting line between the energy storage assembly 200 and the generator 11 on the energy storage assembly 200 can be avoided, and the energy storage assembly 200 is convenient to move.

Optionally, the system further comprises: the mobile device is suitable for driving the energy storage assembly 200 to move, and the energy storage assembly 200 is mounted on the mobile device. By means of the moving device, the energy storage assembly 200 can be moved so as to move the energy storage assembly 200 to a proper position for the discharging operation.

The utility model discloses in, through this natural gas pressure energy power generation energy storage system, can improve the suitability of natural gas pressure energy recovery technique by a wide margin, at some inconvenient internet surfing or the station that is incorporated into the power networks, can store the electric energy of retrieving in the group battery through this technique, carry out power consumption in order to solve this single direction of application of generating electricity in the past and being incorporated into the power networks through the occasion of storage battery of storage to the useful electric demand or through increasing the mode that fills electric pile in the station of storage through the storage battery car.

Additionally, the utility model also provides a natural gas pressure regulating system 100, this natural gas pressure regulating system can utilize expander and generator to provide the electric energy.

In the natural gas pressure regulating station, the high-pressure natural gas of the upstream in-station pipeline is converged into the downstream out-station pipeline, the pressure of the natural gas can be changed, and the pressure change of the natural gas causes energy loss. The utility model discloses in, in the natural gas pressure regulating station, the high-pressure natural gas of upper reaches pipeline of coming into station at first lets in expander 10 (for example two expanders 10) and carries out the inflation step-down, converts the natural gas pressure energy into mechanical energy to generator 11 through the coaxial connection with expander 10 further converts mechanical energy into the electric energy. The natural gas after expansion and depressurization is converged into a downstream outbound pipeline. Additionally, the utility model provides a this pressure energy recovery technology of pressure connects in parallel with original regulator in the pressure regulating station, guarantees incessant continuous air feed during expander 10 stops machine to maintain or when emergency stop appears. The natural gas pressure energy recovery project can output high-quality electric energy on the premise of not consuming primary energy. The whole set of equipment only consumes energy from the electricity utilization part, and accounts for about 1-2% of the total power generation power. The recovered electricity can be directly used by being merged into an internal local area network of an electricity utilization enterprise, so that the outsourcing electric quantity of the enterprise is reduced.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 2, the natural gas pressure regulating system 100 according to the embodiment of the present invention includes: air inlet pipe 101, air outlet pipe 102, first pipeline assembly 103, expander 10 and generator 11. Intake pipe 101 is used for letting in the gas natural gas pressure regulating system 100, outlet duct 102 is used for deriving natural gas pressure regulating system 100 with the gas, first pipeline subassembly 103 is used for guiding the air current from intake pipe 101 to outlet duct 102, expander 10 is used for converting pressure energy into mechanical energy, at the gas along first pipeline subassembly 103 circulation in-process, when through expander 10, can carry out the conversion of pressure energy to mechanical energy, generator 11 can be transmitted to expander 10's mechanical energy, thereby generate electricity through generator 11.

Specifically, the first pipe assembly 103 is connected at both ends thereof to the inlet pipe 101 and the outlet pipe 102, respectively. The expander 10 is connected in series to the first pipe assembly 103, and the generator 11 is connected to the expander 10.

According to the utility model discloses natural gas pressure regulating system 100 through setting up expander 10, converts the pressure energy among the gas transportation process into the electric energy, can be applied to natural gas pressure regulating system 100's daily operation with the electric energy, but also can be used for other usage with unnecessary electric energy, for example, with unnecessary electric energy transmission to the electric wire netting in for using, consequently, the utility model provides a natural gas pressure regulating system 100 can retrieve the pressure energy among the natural gas transportation process, and is energy-concerving and environment-protective.

In addition, it should be noted that the generator 11 of the present invention is not an essential component of the natural gas pressure regulating system 100, and in the use process of the natural gas pressure regulating system 100 of the present invention, if the mechanical energy is used for other purposes, the generator 11 may not be provided, but the mechanical energy obtained by converting the expander 10 may be used elsewhere.

In addition, during the operation of the natural gas pressure regulating system 100, a problem may occur that the temperature of the natural gas is too low, when the temperature of the natural gas is too low, the transmission of the natural gas may be affected, and the pressure may be increased due to the temperature increase of the natural gas downstream of the natural gas pressure regulating system 100. For this reason, in order to improve natural gas pressure regulating system 100's performance effectively, the utility model discloses in, set up heat exchange module in natural gas pressure regulating system 100, too high or low excessively to the temperature in the gas, all can adjust through heat exchange module to improve natural gas pressure regulating system 100's stability and security effectively.

As shown in fig. 2, in some embodiments of the present invention, the natural gas pressure regulating system 100 further includes: a heat exchange piping assembly 104 and a heat exchanger 12, the heat exchange piping assembly 104 being connected in parallel with the first piping assembly 103, and the heat exchange piping assembly 104 being connected downstream of the expander 10. The heat exchanger 12 includes a first heat exchanging portion and a second heat exchanging portion, the first heat exchanging portion and the second heat exchanging portion are matched and suitable for heat transfer, the first heat exchanging portion is connected in series to the heat exchanging pipe assembly 104, and the second heat exchanging portion is used for introducing a heat exchanging medium. In the use process, the fuel gas can be introduced into the heat exchange pipeline assembly 104, the heat exchanger 12 is used for temperature regulation, the stability and the safety of the natural gas pressure regulating system 100 are effectively improved, and in addition, the heat exchange system is simple in structure and convenient to control.

In addition, the heat exchange pipeline assembly 104 of the present invention can be connected in parallel with the first pipeline, or the heat exchange pipeline assembly 104 can be connected in series with the first pipeline, and during the use, according to the difference of the temperature of the natural gas, it may be necessary to switch between different transportation channels, for example, the natural gas is transported only through the first pipeline assembly 103; passing natural gas only through the heat exchange pipe assembly 104 and not through the pipe in the first pipe assembly 103 which is connected in parallel with the heat exchange pipe assembly 104; natural gas may also be simultaneously transported through the heat exchange tube assembly 104 and the tubes of the first tube assembly 103 that are in parallel with the heat exchange tube assembly 104. Therefore, the utility model discloses in provide a to the device that the gas flow was adjusted to can switch the circulation direction of gas, with the stable transmission that realizes the natural gas.

The gas flow direction adjusting device can be a reversing valve or a valve assembly.

In some embodiments of the present invention, the first pipeline assembly 103 includes a first switch valve 131, the first switch valve 131 is connected in parallel with the heat exchange pipeline assembly 104, the heat exchange pipeline assembly 104 includes a second switch valve 132 and a third switch valve 133, and the second switch valve 132 and the third switch valve 133 are respectively connected in series at the upstream and downstream of the heat exchanger 12. Therefore, the natural gas conveying direction can be adjusted by opening and closing the first switch valve 131, the second switch valve 132 and the third switch valve 133, so that the natural gas conveying direction can be stably adjusted, and the stability of the natural gas pressure regulating system 100 is improved.

The second switch valve 132 and the second switch valve 132 may be alternatively arranged or simultaneously arranged, that is, the heat exchange pipeline assembly 104 of the present invention may only include the second switch valve 132; the heat exchange pipeline assembly 104 of the present invention may only include the third on/off valve 133; the heat exchange pipeline assembly 104 of the present invention may include both the second on-off valve 132 and the third on-off valve 133. Additionally, the utility model provides a switching valve can be the ball valve.

In some embodiments of the present invention, it is necessary to perform stable control on the temperature of the natural gas, and therefore, the present invention provides a temperature transmitter in the first pipeline assembly 103, for example, the temperature transmitter may be provided in at least one of the upstream and downstream of the heat exchange pipeline assembly 104. Specifically, in an example of the present invention, the first pipe assembly 103 further comprises a first temperature transmitter 141 and a second temperature transmitter 142, and the first temperature transmitter 141 and the second temperature transmitter 142 are respectively connected to the upstream and downstream of the heat exchange pipe assembly 104. Through the detection to heat exchange pipeline subassembly 104 upper reaches and low reaches temperature, can acquire the running state of heat exchange tube subassembly fast, when heat exchange pipeline subassembly 104 upper reaches and low reaches temperature variation unsatisfied rated condition, can select to increase or reduce heat exchange efficiency and the heat transfer efficiency of heat exchanger 12, perhaps judge the running state of heat exchanger 12 fast, thereby conveniently acquire the running state of natural gas pressure regulating system 100 fast, in time discover the trouble that probably appears in the natural gas pressure regulating system 100, in time maintain, thereby further improve the stability and the security of natural gas pressure regulating system 100.

Optionally, the first conduit assembly 103 includes a first pressure regulating valve 161, the first pressure regulating valve 161 being connected upstream of the expander 10. By providing the pressure regulating valve, the pressure in the first pipe assembly 103 can be quickly regulated, effectively improving the stability and safety of the first pipe assembly 103.

Optionally, the first conduit assembly 103 includes a second pressure regulating valve 162, the second pressure regulating valve 162 being connected downstream of the expander 10. Wherein, the utility model discloses in can all set up the air-vent valve in the upper reaches and the low reaches of expander 10, also can set up the air-vent valve in the upper reaches of expander 10 and a department in low reaches to in time feed back expander 10, natural gas pressure regulating system 100's running state through the air-vent valve, so that to natural gas pressure regulating system 100, expander 10's quick adjustment. To achieve a balance between the stability of the natural gas pressure regulating system 100 and the output energy efficiency of the expander 10.

Optionally, the first pipe assembly 103 comprises a third temperature transmitter 143, the third temperature transmitter 143 being connected upstream of the expander 10, the temperature upstream of the expander 10 being rapidly obtained by the third temperature transmitter 143, so as to facilitate stable operation of the expander 10.

Optionally, the first pipe assembly 103 comprises a first pressure transmitter 151, the first pressure transmitter 151 being connected upstream of the expander 10, the temperature upstream of the expander 10 being rapidly obtained by the third temperature transmitter 143, so as to facilitate stable operation of the expander 10.

Optionally, the first pipe assembly 103 comprises a fourth temperature transmitter 144, the fourth temperature transmitter 144 being connected downstream of the expander 10, by means of which fourth temperature transmitter 144 the temperature downstream of the expander 10 can be quickly taken to facilitate a stable operation of the expander 10.

Optionally, the first pipe assembly 103 comprises a second pressure transmitter 152, the second pressure transmitter 152 being connected downstream of the expander 10, the temperature downstream of the expander 10 being rapidly obtained by the fourth temperature transmitter 144 to facilitate stable operation of the expander 10.

Optionally, the first conduit assembly 103 includes a filter 18, the filter 18 being in series downstream of the expander 10. Through setting up filter 18, can improve the stability of natural gas pressure regulating system 100 to reduce the impurity in the natural gas of carrying, improve the quality of natural gas, and can maintain the stability of natural gas pressure regulating system 100.

Optionally, the natural gas pressure regulating system 100 further includes: a second pipeline assembly 105 and a valve assembly, wherein two ends of the second pipeline assembly 105 are respectively connected with the gas inlet pipe 101 and the gas outlet pipe 102, and the first pipeline assembly 103 is connected with the second pipeline assembly 105 in parallel; a valve assembly is associated with the first and second conduit assemblies 103 and 105, respectively, and is configured to control the connection or disconnection of the first conduit assembly 103 and the connection or disconnection of the second conduit assembly 105. In the use, the natural gas can circulate through first pipeline subassembly 103, also can circulate through second pipeline subassembly 105, like this, when expander 10 trouble or when needing to maintain, can set natural gas pressure regulating system 100 to carry the gas through second pipeline subassembly 105 to can maintain lasting gas of passing through, improve natural gas pressure regulating system 100's stability and security effectively, and make things convenient for the maintenance of expansion valve.

The valve assembly of the present invention may be a reversing valve or other structure, for example, by providing a shut-off valve to cut and open the first and second pipe assemblies 103 and 105, thereby achieving the purpose of switching the passage.

Optionally, in some embodiments of the present invention, the valve assembly includes a first shut-off valve 171 and a second shut-off valve 172, the first shut-off valve 171 being connected in series with the first pipe assembly 103, and the second shut-off valve 172 being connected in series with the second pipe assembly 105. By the first cutoff valve 171 and the second cutoff valve 172, a desired passage can be selected, and stable control of the natural gas pressure regulating system 100 is realized.

Optionally, the valve assembly further comprises: and a third pressure transmitter 153, wherein the third pressure transmitter 153 is connected to the second pipe assembly 105 and connected to the upstream of the second cutoff valve 172, and the third pressure transmitter 153 transmits signals to the first cutoff valve 171 and the second cutoff valve 172. Whether the natural gas pressure regulating system 100 has a fault or not can be determined by acquiring the pressure condition of the second pipeline assembly 105, so that the states of the first cutoff valve 171 and the second cutoff valve 172 are controlled, and the natural gas pressure regulating system 100 is controlled.

Optionally, the second pipe assembly 105 comprises a plurality of first branches 106 connected in parallel, each first branch 106 being provided with at least one first shut-off valve 171 and a third pressure regulating valve 163. By providing a plurality of first branches 106, a redundant design can be formed, and when a failure occurs in one of the first branches 106, the first branch 106 can be switched, thereby improving the stability of the natural gas pressure regulating system 100.

Optionally, the second tubing assembly 105 further comprises a fourth pressure transmitter 154, the fourth pressure transmitter 154 being connected downstream of the plurality of first branches 106. The natural gas pressure regulating system 100 can be further controlled by the fourth pressure transmitter 154 to chat the state of the natural gas pressure regulating system 100 in time, thereby improving the control effect.

Optionally, the natural gas pressure regulating system 100 further includes: the high-pressure emptying header pipe 107 and the high-pressure emptying header pipe 107 are connected with the second pipeline assembly 105, and a pressure relief structure is connected between the high-pressure emptying header pipe 107 and the second pipeline assembly 105. Through the high-pressure emptying header pipe 107, the pressure of the natural gas pressure regulating system 100 can be stabilized, and the stability and the safety of the natural gas pressure regulating system 100 are improved

Optionally, the natural gas pressure regulating system 100 further includes: low pressure air release house steward 108, low pressure air release house steward 108 links to each other with second pipeline assembly 105, and is connected with pressure relief structure between low pressure air release house steward 108 and the second pipeline assembly 105, and low pressure air release house steward 108 links to each other with first pipeline assembly 103, and is connected with pressure relief structure between low pressure air release house steward 108 and the first pipeline assembly 103. Further improving the stability of the natural gas pressure regulating system 100.

Optionally, the natural gas pressure regulating system 100 further comprises a second branch 109, the second branch 109 is configured to inject an inert gas into the natural gas pressure regulating system 100, and a fourth switch valve 134 is connected to the second branch 109. Inert gas, such as nitrogen, can be injected into the natural gas pressure regulating system 100 through the second branch 109, so that air in the natural gas pressure regulating system 100 can be evacuated, and the safety of the natural gas pressure regulating system 100 is effectively improved.

Optionally, inlet pipe 101 is connected in series with inlet valve 191, and outlet pipe 102 is connected in series with outlet valve 192.

As shown in fig. 2, according to the utility model discloses a natural gas pressure regulating system 100 of a specific embodiment, including first pipeline subassembly 103, second pipeline subassembly 105 and heat exchange pipeline subassembly 104, first pipeline subassembly 103 establishes ties with second pipeline subassembly 105, and heat exchange pipeline subassembly 104 is parallelly connected with second pipeline subassembly 105, wherein, has set gradually third pressure transmitter 153, a plurality of parallelly connected first branch road 106 on the first pipeline subassembly 103, fifth pressure transmitter, fifth ooff valve, wherein, has parallelly connected second trip valve 172 and third air-vent valve 163 on the first branch road 106. The second pipe assembly 105 is sequentially provided with a sixth switching valve, a first cut-off valve 171, a first pressure regulating valve 161, a first pressure transmitter 151, a third temperature transmitter 143, the expander 10, a fourth temperature transmitter 144, a second temperature transmitter 142, the filter 18, a first temperature transmitter 141, a first switching valve 131, and a second temperature transmitter 142. The heat exchange pipeline assembly 104 is connected in parallel with the first switch valve 131, and the heat exchange pipeline assembly is sequentially connected with a second switch valve 132, the heat exchanger 12 and a third switch valve 133. Both ends of the second heat exchanging part of the heat exchanger 12 are connected with a seventh switching valve and an eighth switching valve, respectively. A second branch 109 is connected between the sixth switching valve and the valve, and a third switching valve 133 is connected to the second branch 109. The high-pressure air release manifold 107 is connected between the air inlet pipe 101 and the second pipeline assembly 105, a ninth switch valve and a fourth switch valve 134 which are connected in parallel are connected to the high-pressure air release manifold 107, a safety valve is connected in series with the tenth switch valve, the low-pressure air release manifold 108 is connected with the first pipeline assembly 103 and the second pipeline assembly 105, an eleventh switch valve and a twelfth switch valve are connected in parallel between the pressure air release manifold and the second pipeline assembly 105, and a safety valve is connected in series with the twelfth switch valve.

The utility model provides an expander 10 can be double-rotor expander 10, according to the utility model discloses expander 10 can include casing, external rotor and inner rotor. The shell is internally provided with a first accommodating cavity, the shell is provided with an air inlet and an air outlet which are communicated with the first accommodating cavity, and the air outlet is connected with an inlet of the first cold energy recovery heat exchanger 12.

A second containing cavity is formed in the outer rotor, N grooves are formed in the wall of the second containing cavity, and a through hole is formed in the wall of each groove. The outer rotor is rotatably arranged in the first accommodating cavity, an air inlet cavity communicated with the air inlet and an air outlet cavity communicated with the air outlet are defined by the outer rotor and the wall of the first accommodating cavity, and the volume of the air outlet cavity is larger than that of the air inlet cavity.

N-1 teeth are arranged on the inner rotor at intervals, wherein N is an integer larger than 2, and the shape of the teeth is matched with that of the grooves. Wherein, the inner rotor is rotatably arranged in the second accommodating cavity. According to the utility model discloses an embodiment, inner rotor and external rotor disalignment, the rotational speed ratio of inner rotor and external rotor corresponds with the ratio of the number of tooth and recess.

Specifically, the high-pressure natural gas enters the first accommodation chamber, i.e., the expander 10, from the gas inlet of the housing, and pushes the outer rotor and the inner rotor to rotate. Because the outer rotor and the inner rotor are not coaxial, and the rotating speed of the outer rotor is not consistent with that of the inner rotor, the volume of a cavity formed between the teeth of the inner rotor and the grooves of the outer rotor is gradually increased in the rotating process, and the cavity is transited to be coupled with the air outlet cavity, so that the purpose of expanding and reducing the pressure is achieved. In the natural gas expansion process, the pressure energy of the natural gas can output mechanical energy outwards through a shaft connected with the inner rotor. According to one embodiment of the present invention, the expansion ratio of the expander 10 is determined by the volume ratio of the inlet chamber to the outlet chamber.

According to the utility model discloses expander 10 has strong, the wide advantage of application scope of expansibility, compares with current expander 10 and can utilize the expansion ratio interval of wideer.

Advantageously, in a pressure interval of 10.0mpa.g-0.4mpa.g with the maximum pressure energy contained in the natural gas pipeline network, various natural gas pressure regulating mechanisms in the interval can be adapted by designing the expander 10 into one stage or multiple stages (for example, three stages). According to an embodiment of the present invention, the multistage expander 10 can be coaxially connected, so that the whole device has a simple and compact structure and a small volume.

The expander 10 according to the embodiment of the present invention also has the advantage of high expansion efficiency. For example, at a power of 200kW or less, the efficiency of the expander 10 is between 75% and 85%, and at a power of 200kW or more, the efficiency of the expander 10 is 85% or more.

According to the utility model discloses expander 10 can adapt to the inlet pressure and the flow that change, when inlet pressure and the undulant 20% of flow about, expander 10's expansion efficiency still can keep more than 70%. Moreover, the air inlet of the expander 10 according to the embodiment of the present invention can accommodate fluid media such as gas, liquid, and gas-liquid mixture.

According to the utility model discloses expander 10's axle rotational speed can be high can be low, can design according to relevant professional technical personnel's requirement, need not the derailleur and can directly export power frequency electricity with 11 coaxial coupling of generator, has reduced mechanical work loss, can show the ground and improve the generating efficiency.

Moreover, the expander 10 according to the embodiment of the present invention has the advantages of simple structure, low cost and easy maintenance. The outer rotor and the inner rotor are both of two-dimensional structures, the processing cost is low, oil lubrication is not needed between the outer rotor and the inner rotor, the outer rotor and the inner rotor are firm and impact-resistant, and the number of easily damaged parts is small. The expander 10 can be made as a series of standardized components, manufactured modularly.

Therefore, according to the utility model discloses expander 10 has advantages such as expansibility is strong, application scope is wide, expansion efficiency is high, strong adaptability, simple structure, with low costs, easy maintenance.

The utility model provides a natural gas pressure regulating system 100 mainly includes structural component such as expander 10, asynchronous generator 11, import governing valve, export governing valve, metering device, filter 18, can realize that the natural gas pressure energy is retrieved and is decided the function demand that the expansion ratio steps down. The core technology of the natural gas pressure energy power generation process device is a novel double-rotor expander 10. The novel dual rotor expander 10 is simple in construction and only requires rotation to effect expansion of the fluid. The main structure of the device comprises an inner rotor and an outer rotor which rotate around respective shafts, and the inner rotor and the outer rotor are synchronous but not contacted with each other by utilizing a unique driving mechanism. By additionally arranging the natural gas pressure energy power generation process device in the natural gas pressure regulating station, the pressure energy released by natural gas in the expansion and pressure reduction process can be recycled, and electric energy is output outwards through the coaxially connected generator 11. The pressure energy recovery process is generally connected in parallel with an original pressure regulating device in a pressure regulating station, uninterrupted continuous gas supply is guaranteed during the maintenance period of shutdown of the expansion machine 10 or emergency shutdown, and gas supply safety of downstream users is not affected. The equipment adopts a full-automatic control system and can be self-adaptive according to the fluctuation of the natural gas pressure at upstream and downstream. Meanwhile, one-key starting/stopping can be realized, and the system has the advantages of simplicity in operation, no need of on duty and the like.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (9)

1. A natural gas pressure energy power generation and storage system is characterized by comprising:

an expander;

a generator connected to the expander;

the energy storage assembly comprises an energy storage battery, an electricity storage device and a discharging device, the electricity storage device is connected with the generator, and the energy storage battery is respectively connected with the electricity storage device and the discharging device.

2. The natural gas pressure energy electricity generating and storing system of claim 1, wherein the electricity storage device comprises:

an AC contactor including a first terminal, a second terminal, and a third terminal, the first terminal selectively connecting the second terminal and the third terminal;

the resistance box is connected with the second joint;

a rectifier connected to the third connector and the energy storage battery, respectively,

wherein the first joint is connected with the generator.

3. The natural gas pressure energy electricity generating and storing system of claim 2, wherein the energy storage assembly further comprises:

the energy management system is respectively connected with the rectifier and the discharging device;

and the PLC is respectively connected with the energy management system and the alternating current contactor.

4. The natural gas pressure energy electricity generating and storing system of claim 1, wherein the electrical discharge device comprises:

the inverter is connected with the energy storage battery.

5. The natural gas pressure energy electricity generating and storing system of claim 1, wherein the energy storage assembly is detachably connected to the generator.

6. The natural gas pressure energy electricity generating and storing system of claim 1, further comprising:

the moving device is suitable for driving the energy storage assembly to move, and the energy storage assembly is installed on the moving device.

7. The natural gas pressure energy electricity generating and storing system of claim 1, further comprising:

the expansion machine comprises a first pipeline assembly, a second pipeline assembly and a third pipeline assembly, wherein both ends of the first pipeline assembly are respectively connected with an air inlet pipe and an air outlet pipe;

a heat exchange tube assembly connected in parallel with the first tube assembly and connected downstream of the expander;

the heat exchanger comprises a first heat exchange part and a second heat exchange part, the first heat exchange part and the second heat exchange part are matched and suitable for heat transfer, the first heat exchange part is connected in series with the heat exchange pipeline assembly, and the second heat exchange part is used for introducing a heat exchange medium.

8. The natural gas pressure energy electricity generating and storing system of claim 7, further comprising:

the two ends of the second pipeline assembly are respectively connected with the air inlet pipe and the air outlet pipe, and the first pipeline assembly is connected with the second pipeline assembly in parallel;

a valve assembly connected to the first and second conduit assemblies, respectively, the valve assembly being configured to control the intake pipe and the first conduit assembly to be turned on or off and the intake pipe and the second conduit assembly to be turned on or off.

9. The natural gas pressure energy electricity generating and storing system of claim 8, wherein the valve assembly comprises a first shut-off valve and a second shut-off valve, the first shut-off valve being connected in series to the first pipeline assembly, the second shut-off valve being connected in series to the second pipeline assembly.

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