Urban gas composite type station based on differential pressure power generation

Abstract

The utility model relates to an urban gas composite type field station based on differential pressure power generation, which comprises a high-pressure pipeline, a medium-pressure pipeline, a high-pressure manifold, a medium-pressure manifold, a pipeline a, a pipeline b, a monitoring feedback device a, a differential pressure power generation device, a power storage device, a pressure stabilizing valve group, an electric heating device, electric equipment and a distribution device, the pressure difference power generation device and the monitoring feedback device b are connected with the pipeline a in parallel, the pressure difference power generation device and the monitoring feedback device b are arranged on the pipeline b, the pressure difference power generation device is connected with the allocation device, the allocation device is connected with the electricity storage device, the electric heating device and the electric equipment, and the pressure stabilizing valve group is arranged between the pipeline a and the pipeline b; pressure energy in high-pressure fuel gas is converted into electric energy, the electricity utilization requirement of operation equipment such as remote control automatic electric appliances in a pressure regulating station is met, meanwhile, it is guaranteed that the fuel gas can enter a municipal pipe network after meeting the standard state, and meanwhile extra electric energy can be generated to create more profits for urban fuel gas enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of urban gas transmission and distribution, and in particular to an urban gas composite station based on pressure difference power generation. Background Art

[0002] In the process of long-distance gas transmission and distribution, the gas is pressurized by pressure-boosting equipment, and then transported through the long-distance pipeline network to the gate station. The pressure-regulating equipment in the gate station regulates the high-pressure gas, and adjusts the gas in the high-pressure A state of 4.0MPa~1.6MPa to a sub-high pressure of 1.6MPa~0.4MPa or a medium pressure of 0.4MPa~0.2MPa to meet the use requirements of urban residents, industry, commerce and other gas users. The process of gas changing from a high-pressure state to a low-pressure state obeys the Bernoulli equation: the decrease in fluid pressure energy causes its kinetic energy to increase, and the flow rate of the gas increases after the pressure drop. Most urban gas transmission and distribution processes only control the state of the gas at the outlet of the pressure regulator to meet the transmission and distribution requirements by changing the expansion and contraction amount of the spring in the pressure regulator. The high-speed gas that has been depressurized directly hits the diaphragm of the pressure regulator. Although the pressure regulation effect is achieved by reducing the flow rate and kinetic energy, this process greatly wastes the gas’s At the same time, the pressure reduction process is also accompanied by a temperature drop in the gas. In the north, this temperature drop makes it impossible for the gas to directly enter the municipal pipeline network and cannot meet the use conditions of residents, industry, commerce, etc. At present, most urban gas transmission and distribution processes in China have not fully considered the application of technology to recover this part of the lost energy. The energy generated by differential pressure power generation can compensate for the energy required for the gas temperature drop. The function of the traditional station is to adjust the gas to a suitable pressure level and then supply it to the downstream transportation pipeline network. The utility model composite station can provide power supplement services while realizing the basic functions of the station.

[0003] A Chinese patent with publication number CN113090353A discloses a medium-low pressure gas pressure difference power generation system, which is arranged between an upstream medium-low pressure gas pipeline and a downstream medium-low pressure gas pipeline. A gas pressure regulating station connected to the upstream medium-low pressure gas pipeline and the downstream medium-low pressure gas pipeline is also arranged. The system includes a No. 1 pipeline, a No. 2 pipeline, a gas pressure regulating device, a transmission device, a power generation device and a power storage device. The air inlet of the No. 1 pipeline is connected to the air outlet of the upstream medium-low pressure gas pipeline, and the air outlet of the No. 2 pipeline is connected to the air inlet of the downstream medium-low pressure gas pipeline. The gas pressure regulating device, the transmission device, the power generation device and the power storage device are arranged in sequence. The gas pressure regulating device is arranged on the No. 1 pipeline, the transmission device is arranged between the No. 1 pipeline and the No. 2 pipeline and is connected, the power generation device and the transmission device are transmission-connected, and the power storage device and the gas pressure regulating station are electrically connected; however, the patent does not take into account the temperature drop problem of the gas after the pressure difference power generation, and there are obvious defects.

[0004] The Chinese patent with the publication number CN2755288Y discloses a new type of combined power generation device that uses the pressure difference of natural gas transmission and distribution pipelines to generate electricity, including a natural gas transmission and distribution pipeline of upper pressure, a natural gas transmission and distribution pipeline of lower pressure, a pressure regulator, and a valve. It is characterized in that it also includes a natural gas turbine expander generator set, an internal combustion gas engine generator set or a gas turbine generator set, and a split heat pipe heat exchanger. The device is a power generation equipment with a high energy utilization rate, which not only recycles the pressure energy released during the natural gas decompression process, but also recycles the waste heat energy generated during the power generation process of the internal combustion gas engine generator set or the gas turbine generator set; however, the heat provided by the tail gas of the diesel generator in the patent is relatively even and cannot be adjusted to match the heat required by the gas. Summary of the invention

[0005] The utility model provides a composite town gas station based on pressure difference power generation, which can convert the pressure energy of high-pressure gas into usable electrical energy to meet the electricity demand of remote control and remote transmission intelligent equipment in the pressure regulating station, and on the basis of gas entering the municipal pipeline network in a standardized state, the pressure energy and kinetic energy of the gas are recycled and utilized, so as to generate additional electrical energy while meeting the energy self-sufficiency in the pressure regulating station, creating more profits for town gas enterprises.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A town gas composite station based on pressure difference power generation, comprising a high-pressure pipeline, a medium-pressure pipeline, a high-pressure manifold, a medium-pressure manifold, a regulating valve a, a filter a, a monitoring feedback device a, a pressure regulator, a pipeline a and an electric heating heat exchanger, wherein the high-pressure pipeline is connected to the high-pressure manifold, the high-pressure manifold is connected to the medium-pressure manifold through the pipeline a, the medium-pressure manifold is connected to the medium-pressure pipeline, the filter a, the pressure regulator, the electric heating heat exchanger and the monitoring feedback device a are arranged on the pipeline a, the signal line of the monitoring feedback device b is connected to the signal input end of the deployment device, and the regulating valve a and the monitoring feedback device a are arranged at both ends of the pipeline a;

[0008] It also includes a pipeline b, a monitoring feedback device b, a pressure difference power generation device, a regulating device, an electricity storage device, a pressure stabilizing valve group, an electric heating device and electrical equipment. The pipeline b is arranged between the high-pressure manifold and the medium-pressure manifold, and the pipeline b is connected in parallel with the pipeline a. The pressure difference power generation device and the monitoring feedback device b are arranged on the pipeline b. The pressure difference power generation device is connected to the regulating device, and the regulating device is connected to the electricity storage device, the electric heating device and the electrical equipment. The pressure stabilizing valve group is arranged between the pipeline a and the pipeline b.

[0009] Furthermore, the electric heating device includes an electric heating heat exchanger and a heat exchanger power adjustment device. The electric heating heat exchanger is arranged on the pipeline b between the pressure difference power generation device and the medium pressure manifold, and the heat exchanger power adjustment device is arranged between the deployment device and the electric heating heat exchanger on the pipeline b.

[0010] Furthermore, it also includes a regulating valve b and a filter b. The regulating valve b is arranged on the pipeline b between the monitoring feedback device b near the high-pressure manifold and the high-pressure manifold and on the pipeline b between the monitoring feedback device b near the medium-pressure manifold and the electric heating device. The filter is arranged on the pipeline b between the monitoring feedback device b near the high-pressure manifold end and the regulating valve b.

[0011] Furthermore, the pressure stabilizing valve group includes a pressure sensor, an electromagnetic shut-off valve and a pressure regulating valve. The pressure sensor is arranged on the pipeline between the pipeline b and the pressure regulating valve, and the electromagnetic shut-off valve and the pressure regulating valve are arranged in series.

[0012] Furthermore, the pressure difference power generation device includes a pressure difference turbine, a gearbox, a generator and a power distribution device, the pressure difference turbine is connected to the gearbox, the gearbox is connected to the generator, and the power distribution device is connected to the deployment device.

[0013] Furthermore, the deployment device includes a monitoring feedback device signal receiver, a microcomputer, a controller and an I / O module, the monitoring feedback device signal receiver is connected to the I / O module, the I / O module is connected to the controller, the power supply end of the controller is connected to the power distribution device, and the communication interface of the controller is connected to the microcomputer.

[0014] Furthermore, the power storage device includes a transformer and a battery, the transformer is connected to the power distribution device, the battery is connected to the transformer, and the electric heating device, monitoring feedback device b, deployment device and electrical equipment are all connected to the battery of the power storage device.

[0015] Furthermore, it also includes an odorizing device, which is connected to the medium-pressure manifold through a pipeline.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1) By adding monitoring feedback device b, pressure difference power generation device, power storage device, pressure stabilizing valve group, electric heating device, power equipment and distribution device in the traditional gas pressure regulating station, the pressure energy in the high-pressure gas can be converted into electric energy that can be reused for a second time to meet the power demand of the power equipment in the pressure regulating station, and further the electric energy can be used as the power source for the charging pile of new energy vehicles;

[0018] 2) Use the electric energy generated by the pressure difference power generation device as the energy source of the electric heating device to solve the temperature drop problem of the gas after the pressure difference power generation, realize heat compensation, and ensure that the gas can enter the municipal pipe network after meeting the standard state;

[0019] 3) The generated electric energy is scientifically and reasonably distributed through the dispatching device and the power storage device to ensure that the electric energy can be efficiently used in the composite station and improve the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] In the figure: 1. High-pressure pipeline 2. Medium-pressure pipeline 3. High-pressure manifold 4. Medium-pressure manifold 5. Regulating valve a 6. Filter a 7. Monitoring feedback device a 8. Voltage regulator 9. Electric heating heat exchanger 10. Pipeline a 11. Monitoring feedback device b 12. Pressure difference power generation device 13. Power storage device 14. Pressure stabilizing valve group 15. Electric heating device 16. Electric equipment 17. Dispensing device 18. Regulating valve b 19. Filter b 20. Pipeline b 21. Odorizing equipment DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0023] See Figure 1 , is a schematic diagram of the structure of the utility model. The utility model is a composite town gas station based on pressure difference power generation, including a high-pressure pipeline 1, a medium-pressure pipeline 2, a high-pressure manifold 3, a medium-pressure manifold 4, a regulating valve a5, a filter a6, a monitoring feedback device a7, a pressure regulator 8, a pipeline a10 and an electric heating heat exchanger 9, wherein the high-pressure pipeline 1 is connected to the high-pressure manifold 3, the high-pressure manifold 3 is connected to the medium-pressure manifold 4 through the pipeline a10, and the medium-pressure manifold 4 is connected to the medium-pressure pipeline 2, the filter a6, the pressure regulator 8, the electric heating heat exchanger 9 and the monitoring feedback device a7 are arranged on the pipeline a10, and the regulating valve a5 and the monitoring feedback device a7 are arranged at both ends of the pipeline a10;

[0024] It also includes a pipeline b20, a monitoring feedback device b11, a pressure difference power generation device 12, a power storage device 13, a pressure stabilizing valve group 14, an electric heating device 15, an electrical equipment 16, a regulating device 17, a regulating valve b18, a filter b19 and an odorizing device 21. The pipeline b20 is arranged between the high-pressure manifold 3 and the medium-pressure manifold 4, and is connected in parallel with the pipeline a10. The pressure difference power generation device 12 and the monitoring feedback device b11 are arranged on the pipeline b20. The pressure difference power generation device 12 is connected to the regulating device 17, and the regulating device 17 is connected to the power storage device 13, the electric heating device 15 and the electrical equipment 16. The pressure stabilizing valve group 14 is It is arranged between the pipeline a10 and the pipeline b20, and the monitoring feedback device b11 and the monitoring feedback device a7 are connected to the monitoring feedback device signal receiver of the mixing device 17 by wire or wirelessly; a regulating valve b18 is arranged on the pipeline b20 between the monitoring feedback device b11 and the high-pressure manifold 3 near the high-pressure manifold 3 and on the pipeline b20 between the monitoring feedback device b11 and the electric heating device 15 near the medium-pressure manifold 4, and the filter is arranged on the pipeline b20 between the monitoring feedback device b11 and the regulating valve b18 near the end of the high-pressure manifold 3; the odorizing device 21 is connected to the medium-pressure manifold 4 through a pipeline.

[0025] The electric heating device 15 includes an electric heating heat exchanger 9 and a heat exchanger power adjustment device. The electric heating heat exchanger 9 is arranged on the pipeline b20 between the pressure difference power generation device 12 and the medium pressure manifold 4. The heat exchanger power adjustment device is arranged between the allocation device 17 and the electric heating heat exchanger 9 on the pipeline b20.

[0026] The pressure stabilizing valve group 14 includes a pressure sensor, an electromagnetic shut-off valve and a pressure regulating valve. The pressure sensor is arranged on the pipeline between the pipeline b20 and the pressure regulating valve. The electromagnetic shut-off valve and the pressure regulating valve are arranged in series.

[0027] The pressure difference power generation device 12 includes a pressure difference turbine, a gearbox, a generator and a power distribution device. The pressure difference turbine is connected to the gearbox, the gearbox is connected to the generator, and the generator is connected to the power distribution device.

[0028] The adjustment device 17 includes a monitoring feedback device signal receiver, a microcomputer, a controller and an I / O module. The monitoring feedback device signal receiver is connected to the I / O module, the I / O module is connected to the controller, the power supply end of the controller is connected to the power distribution device, and the communication interface of the controller is connected to the microcomputer.

[0029] The power storage device 13 includes a transformer and a battery. The transformer is connected to a power distribution device, and the battery is connected to the transformer. The electric heating device 15 , the monitoring feedback device b11 , the adjustment device 17 and the electrical equipment are all connected to the battery of the power storage device 13 .

[0030] Working principle: High-pressure gas is gathered in the high-pressure manifold 3 through the high-pressure pipeline 1, the regulating valve b18 is opened, and the regulating valve a5 and the pressure-stabilizing valve group 14 are ensured to be in the automatic adjustment state, so that the high-pressure gas enters the pipeline b20, is filtered by the regulating valve b18 and the filter b19 and enters the pressure difference turbine, and is converted into medium-pressure gas through the high-medium pressure differential power generation device 12, and then heat compensation is performed through the electric heating heat exchanger 9 of the electric heating device 15. The heated medium-pressure gas is gathered through the medium-pressure manifold 4 and directly distributed to the medium-pressure pipeline 2. The monitoring feedback device b11 installed near the side of the medium-pressure manifold 4 monitors the data of the medium-pressure gas, and the gas that meets the requirements is incorporated into the town gas official website or dedicated line for residential, industrial and commercial use.

[0031] The electric energy generated by the high-medium pressure differential power generation device 12 passes through the power distribution device and is distributed by the adjustment device 17. According to different power generation conditions, the electric energy is supplied to the electric heating device 15, the power storage device 13 and the power consumption equipment 16 respectively. The power consumption equipment 16 includes a charging pile of new energy. The electric heating device 15 is connected to the battery in the power storage device 13. When the power generation power is in the peak section, the electric energy of the pressure differential power generation device 12 is directly distributed to the electric heating device 15 and the power consumption equipment 16 through the distribution of the adjustment device 17. The remaining power is stored in the power storage device 13. The power consumption equipment 16 supplies power to external equipment. The power storage device 13 is an emergency power supply for external equipment or a pressure regulating station. When the power generation power is in the valley section, the electric energy of the power storage device 13 is directly distributed to the electric heating device 15 through the distribution of the adjustment device 17, so as to ensure that the gas can meet the requirements for entering the urban gas pipeline network.

[0032] As the operating conditions of urban gas have the characteristics of peaks, valleys and flatness, in order to ensure the stability of downstream gas pressure and pressure difference power generation output power during the pressure regulation process, a pressure stabilizing valve group 14 is set between pipeline a10 and pipeline b20. When the pressure in pipeline b20 fluctuates greatly, the pressure stabilizing valve group 14 is used to switch to pipeline a10, and the equipment on pipeline a10 is used as a backup bypass. When the equipment on pipeline b20 fails, it can still be switched to the traditional gas pressure regulating station for normal production. In order to ensure the stability of downstream gas pressure, the pressure regulating valve of the pressure stabilizing valve group 14 is adjusted to ensure the stability of downstream gas pressure and pressure difference power generation output power during the pressure regulation process.

[0033] The above embodiments are implemented based on the technical solution of the utility model, and detailed implementation methods and specific operation processes are given, but the protection scope of the utility model is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A town gas composite station based on pressure difference power generation, comprising a high-pressure pipeline, a medium-pressure pipeline, a high-pressure manifold, a medium-pressure manifold, a regulating valve a, a filter a, a monitoring feedback device a, a pressure regulator, a pipeline a and an electric heating heat exchanger, wherein the high-pressure pipeline is connected to the high-pressure manifold, the high-pressure manifold is connected to the medium-pressure manifold through the pipeline a, the medium-pressure manifold is connected to the medium-pressure pipeline, the filter a, the pressure regulator, the electric heating heat exchanger and the monitoring feedback device a are arranged on the pipeline a, and the regulating valve a and the monitoring feedback device a are arranged at both ends of the pipeline a; It is characterized in that It also includes a pipeline b, a monitoring feedback device b, a pressure difference power generation device, a regulating device, a power storage device, a pressure stabilizing valve group, an electric heating device and an electrical equipment. The pipeline b is arranged between the high-pressure manifold and the medium-pressure manifold, and the pipeline b is connected in parallel with the pipeline a. The pressure difference power generation device and the monitoring feedback device b are arranged on the pipeline b. The pressure difference power generation device is connected to the regulating device, and the regulating device is connected to the power storage device, the electric heating device and the electrical equipment. The signal line of the monitoring feedback device b is connected to the signal input end of the regulating device, and the pressure stabilizing valve group is arranged between the pipeline a and the pipeline b.

2. A town gas composite station based on pressure difference power generation according to claim 1, characterized in that: The electric heating device includes an electric heating heat exchanger and a heat exchanger power adjustment device. The electric heating heat exchanger is arranged on the pipeline b between the pressure difference power generation device and the medium pressure manifold. The heat exchanger power adjustment device is arranged between the deployment device and the electric heating heat exchanger on the pipeline b.

3. A town gas composite station based on pressure difference power generation according to claim 1, characterized in that: It also includes a regulating valve b and a filter b. The regulating valve b is arranged on the pipeline b between the monitoring feedback device b near the high-pressure manifold and the high-pressure manifold and on the pipeline b between the monitoring feedback device b near the medium-pressure manifold and the electric heating device. The filter is arranged on the pipeline b between the monitoring feedback device b near the high-pressure manifold end and the regulating valve b.

4. A town gas composite station based on pressure difference power generation according to claim 1, characterized in that: The pressure stabilizing valve group includes a pressure sensor, an electromagnetic cut-off valve and a pressure regulating valve. The pressure sensor is arranged on the pipeline between the pipeline b and the pressure regulating valve, and the electromagnetic cut-off valve and the pressure regulating valve are arranged in series.

5. A town gas composite station based on pressure difference power generation according to claim 1, characterized in that: The pressure difference power generation device includes a pressure difference turbine, a gearbox, a generator and a power distribution device. The pressure difference turbine is connected to the gearbox, the gearbox is connected to the generator, the generator is connected to the power distribution device, and the power distribution device is connected to the adjustment device.

6. A town gas composite station based on pressure difference power generation according to claim 5, characterized in that: The deployment device includes a monitoring feedback device signal receiver, a microcomputer, a controller and an I / O module. The monitoring feedback device signal receiver is connected to the I / O module, the I / O module is connected to the controller, the power supply end of the controller is connected to the power distribution device, and the communication interface of the controller is connected to the microcomputer.

7. A town gas composite station based on pressure difference power generation according to claim 5, characterized in that: The power storage device comprises a transformer and a battery, wherein the transformer is connected to a power distribution device, the battery is connected to the transformer, and the electric heating device, monitoring feedback device b, adjustment device and electrical equipment are all connected to the battery of the power storage device.

8. A town gas composite station based on pressure difference power generation according to claim 1, characterized in that: It also includes an odorizing device, which is connected to the medium-pressure manifold through a pipeline.

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