CN111181184A - Product stores up and uses integration comprehensive utilization system based on pressure energy electricity generation - Google Patents
Product stores up and uses integration comprehensive utilization system based on pressure energy electricity generation Download PDFInfo
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- CN111181184A CN111181184A CN202010107921.3A CN202010107921A CN111181184A CN 111181184 A CN111181184 A CN 111181184A CN 202010107921 A CN202010107921 A CN 202010107921A CN 111181184 A CN111181184 A CN 111181184A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention relates to a pressure energy power generation-based integrated comprehensive utilization system for production and storage, which comprises an existing natural gas system, an energy management subsystem for intelligently managing power utilization and power storage sequence, and a power generation subsystem, an energy storage subsystem and an energy utilization subsystem which share an alternating current bus and are based on a double-rotor expander, wherein the energy management subsystem is used for intelligently managing power utilization and power storage sequence; the existing natural gas system comprises a high-pressure gas transmission pipeline, an existing pressure regulating system and a medium-pressure urban pipe network which are connected in sequence; the power generation subsystem comprises a double-rotor expander and a generator connected with the double-rotor expander; a branch is led out from an inlet pipeline of the existing pressure regulating system, the double-rotor expander is connected to the branch, and the natural gas of the drainage part led out from the branch is subjected to work of the double-rotor expander, is subjected to pressure reduction, is subjected to pressure regulation by the pressure regulator, is connected to an outlet of the existing pressure regulating system, and is converged into a medium-pressure urban pipe network. The system jointly supplies energy, combines energy storage and energy utilization, utilizes pressure energy to generate electricity, and can promote the recycling of the pressure energy wasted in pressure regulation in various types of stations of town gas.
Description
Technical Field
The invention relates to the technical field of energy recovery, conversion and utilization, in particular to a pressure energy power generation-based production and storage integrated comprehensive utilization system.
Background
In order to meet the energy requirements of urban development and improvement of the quality of life of residents, 8.0-12.0 MPa ultrahigh-pressure long-distance pipelines and 4.0MPa high-pressure urban gas transmission and distribution pipelines are built in China, and high-pressure natural gas is distributed to end users through a medium-pressure municipal pipeline network after being subjected to step-by-step pressure regulation and reduction to 0.4MPa in a load center.
At present, the pressure regulating mode of various pressure regulating stations in China is throttling expansion, and pressure energy contained in high-pressure natural gas cannot be effectively utilized and is wasted. It is statistical that the national gas consumption in 2018 exceeds 2800 billion cubic meters, with the pipeline gas accounting for about 73%. Theoretically, when the natural gas with 10MPa pressure in a long-distance pipeline is reduced to 0.4MPa through the pressure regulating equipment, about 49W of energy can be released per cubic meter, and if the energy released in the pressure regulating process of the natural gas is utilized, about 130 hundred million kW.h of power can be recovered. The scale of the natural gas used in China in 2030 years is estimated to reach 5000 billion cubic meters, and the pressure energy released after pressure regulation in the conveying process can generate 230 billion kW.h each year.
Although the pressure energy released by the pressure-regulated transportation of natural gas can theoretically be converted into a large amount of electric energy, the success of converting the recovered pressure energy into electric energy is too many at present. The problem of recycling pressure energy released in the pressure regulating process is not considered in the early stage of planning and construction of the town gas pressure regulating station, the automation degree and the intensification degree of equipment in the pressure regulating station are high, and the electric load of the equipment in the station is small; in addition, the peripheral industrial layout and the geographic condition of the pressure regulating station are limited, and peripheral enterprises are few, so that the electric energy converted from surplus pressure energy released by pressure regulation is not consumed, and further, the project of the electric energy converted from the pressure energy is less popularized and applied. However, with the popularization and use of electric vehicles and electric automobiles, charging devices such as charging piles become the new demand, and the demands of resource saving and energy saving and emission reduction are added, so that pressure energy released in the pressure regulating process in various stations of town gas is recycled and converted into electric energy, and the electric energy is very necessary for storage and utilization.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention provides a production and storage integrated comprehensive utilization system based on pressure energy power generation, which aims to recycle pressure energy released by natural gas pressure regulation to generate power, organically coordinate the power generated by the pressure energy with self power consumption of a pressure regulation station, power storage and storage, external charging, an emergency power consumption resistance cabinet and the like, and construct a comprehensive utilization system with balanced production and storage integrated by using a mains supply system as supplement so as to realize the joint power supply of the pressure energy power generation and the mains supply for in-station equipment and a new energy charging pile, and realize an integrated utilization method of peak clipping and valley filling through an energy storage battery and the emergency power consumption resistance cabinet.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an integrated comprehensive utilization system for production and storage based on pressure energy power generation comprises an existing natural gas system, a power generation subsystem based on a double-rotor expander, an energy storage subsystem, an energy utilization subsystem and an energy management subsystem, wherein the energy management subsystem is used for intelligently managing the electricity utilization of the energy utilization subsystem and the electricity storage sequence of the energy storage subsystem; the existing natural gas system comprises a high-pressure gas transmission pipeline, an existing pressure regulating system and a medium-pressure urban pipe network which are connected in sequence; the power generation subsystem comprises a double-rotor expander and a generator connected with the double-rotor expander; a branch is led out from an inlet pipeline of the existing pressure regulating system, the double-rotor expander is connected to the branch, the natural gas led out from the branch is subjected to work and pressure reduction by the double-rotor expander, is subjected to pressure regulation by a pressure regulator, is connected to an outlet of the existing pressure regulating system and is converged into the medium-pressure urban pipe network, and meanwhile, the pressure energy released by the pressure reduction of the natural gas drives the double-rotor expander to generate power so as to drive the generator to generate electric energy; the generator, the energy storage subsystem and the energy utilization subsystem share an alternating current bus;
further, the flow of the existing pressure regulating system is 8000-10000 Nm3H, inletThe pressure is 3.7MPa, the inlet temperature is 15 ℃, and the outlet pressure is 0.35 MPa; the natural gas flow of the branch is 2500Nm3H; the inlet pressure is 1.8MPa, the inlet temperature is 15 ℃, the outlet pressure is 0.73MPa after the work of the double-rotor expander is performed and the pressure is reduced, and the outlet temperature is-29 ℃.
Further, the energy storage subsystem comprises a rectifier, an energy storage battery and an inverter which are connected in sequence; the rectifier rectifies alternating current output by the generator set into direct current and stores the direct current into the energy storage battery; and the inverter converts the direct current output by the rectifier or the energy storage battery into alternating current with stable voltage and frequency and then outputs the alternating current to the energy utilization subsystem.
Further, the rectifier power is 20 kW; the energy storage battery is formed by a group of 100kWh battery stacks, the rated total capacity is 108.8kWh, 680 nodes of 50Ah lithium batteries are adopted, and 680 x 3.2 x 50 is 108.8 kWh; the conversion efficiency of the energy storage system is about 92%, and the actual power of the system is 108.8kWh multiplied by 0.92 to 100 kWh; the power of the inverter is 100 kW.
Further, the energy storage subsystem is connected with the energy management subsystem through an alternating current bus; the energy management subsystem comprises an alternating current contactor, a PLC (programmable logic controller), an energy management system and a current detection device which are connected; the energy management subsystem dynamically controls the output power of the inverter through an intelligent control strategy according to the load condition, and intelligently schedules the electric power among the pipeline natural gas pressure energy power generation, the distribution network, the battery energy storage system and the charging pile; the energy management subsystem charges the battery at the power consumption valley according to the power supply peak-valley characteristic, stores redundant electric energy, feeds back energy to the alternating current bus to supply the direct current to fill the electric pile or other loads to use power at the power consumption peak, and can smooth the fluctuation of the pressure energy generator.
Furthermore, the energy utilization subsystem comprises electric equipment for voltage regulation station processes, life and the like, a new energy charging pile, a variable power resistance cabinet and a fixed power resistance cabinet; the electric equipment, the new energy charging pile and the variable power resistance cabinet are connected in parallel; the fixed power resistance cabinet is directly connected with the generator through the alternating current contactor.
Furthermore, the electric equipment and the new energy charging pile are normal energy equipment; the variable power resistor cabinet and the fixed power resistor cabinet are emergency power consumption equipment. The power utilization equipment is a normal load, the power is 5kW and is lower than the power generation power of the power generation subsystem; the new energy charging pile is intermittent power utilization equipment, has the power of 60kW, and can provide charging service for two new energy automobiles at the same time; the variable power resistor cabinet is an emergency load, the power adjustable range is 0-20 kW, and the actual load can be automatically adjusted according to the load change of a power generation end and a power utilization end of a system so as to meet the requirement of complete consumption of the load of the power generation end; the fixed power resistance cabinet is emergent load, and power is 20kW, with generator output is the same.
The power utilization loads in the system comprise technical and life normal loads in the voltage regulation station, charging equipment (electric vehicle charging piles and electric vehicle charging piles, dynamic loads), energy storage batteries (balance loads) and load resistance cabinets (emergency loads). In order to ensure that the power generation load is matched with the total load of the normal load, the dynamic load, the balance and the emergency load, the power consumption among all the power consumption equipment and the charge-discharge mode of the energy storage battery are logically controlled by the arranged PLC.
The system operation strategy of the invention is as follows:
1. when the total load (normal load and dynamic load) of the electric equipment is lower than the power generation load, the power system in the station is disconnected with the urban power grid, the electric equipment is completely supplied by the pressure energy power generation system, the redundant electric quantity is converted into direct current through the rectifier and is input into the energy storage battery for storage, and the peak clipping is carried out on the electric equipment by charging the energy storage battery pack, so that the system is balanced. Namely:
for production (normal load + dynamic load) + storage (balanced load) (1)
2. When the energy storage battery pack is full or the power generation load is surplus, namely the power generation and storage are unbalanced, the surplus power is released through the variable power resistor cabinet, and the resistor cabinet emergently releases electric energy for peak clipping, so that the system balance is achieved. Namely, it is
Yield is equal to use (normal load + dynamic load) + store (balanced load) + emergency load (2)
3. Under extreme conditions, when the normal load, the dynamic load and the energy storage battery pack are all in no load, in order to ensure the load balance of the system, the pressure energy power generation subsystem operates stably, and the power generation load is completely consumed by the load resistance cabinet, namely
Produce as emergency load (3)
4. When the total load (normal load and dynamic load) of the electric equipment is higher than the load which can be provided by the pressure energy power generation equipment, the PLC controller sends an instruction to the energy storage battery, and the stored electric energy is converted into alternating current by the inverter and then is output to supply power to the electric equipment; the system is balanced by releasing stored electric energy to fill in the valley. Namely:
for birth and storage (4)
5. And if the energy storage battery pack still has insufficient electric energy after releasing the electric energy, the load is filled by accessing the urban network and supplementing the electric energy by the urban network, so that the requirements of dynamic load and normal load are met. Namely:
produce + commercial power (5)
Basic principles for ensuring the system load of the invention:
1. ensuring the stable operation of the pressure energy power generation device, reducing fluctuation range, and striving to maintain the power generation load to operate between 70% and 95% of rated power;
2. the frequent start and stop of the pressure energy power generation subsystem are avoided, and the high efficiency of the power generation system is maintained;
3. the stored electric energy of the energy storage battery is released in time, and the energy storage battery pack is in a lower energy storage position in a normal state;
4. the operation of the variable power emergency resistance cabinet is avoided as much as possible or the variable power emergency resistance cabinet is operated under low load, so that the effective utilization of electric energy is ensured;
5. ensuring that the power generation load is less than or equal to the total load (grid connection and no network connection);
6. if necessary, the pressure energy power generation load is adjusted to reach the balance for production and storage.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention does not consume natural gas, but utilizes the pressure energy released by the pipeline natural gas through pressure regulation to drive the rotor expander to generate power and drive the generator to generate electric energy, fully recycles the pressure energy released by pressure regulation, avoids waste, saves energy and reduces emission.
2. The invention realizes real-time balance of power generation load and power utilization loads such as a charging pile and a voltage regulating station by using power storage and discharge equipment such as an energy storage battery and a variable power resistance cabinet and introducing commercial power and adjusting the power generation load of pressure energy. Namely: on the basis that pressure energy power generation meets the conventional power consumption of a voltage regulating station, the energy storage battery is used for storing the surplus electric quantity during the low ebb of the power consumption, and the energy storage battery and the commercial power supply are used for supplying power to the new energy charging pile together in the peak charging period, so that the demand of high peak power consumption is met, peak clipping and valley filling are realized, the problem of power distribution and capacity increase is solved, the energy utilization mode is sustainable development, and the energy utilization mode has great social benefit and economic benefit.
3. The invention utilizes the electric energy generated by the generator to provide energy for the heat exchanger, and the electric energy exchanges heat with the natural gas at the outlet of the rotor expander, so that the natural gas which is converged into the main path meets the temperature requirement of town gas.
4. The invention realizes multiple modes of round-robin charging, intelligent dynamic distribution charging and the like through an energy management system based on pressure energy recovery power generation in the high-pressure natural gas depressurization process in the town gas pressure regulating station, supports intelligent scheduling of electric energy, can adjust the charging strategies of the charging pile and the energy storage battery according to load fluctuation of a power utilization end in real time, ensures full utilization of pressure energy power generation and reliability and economy of charging of commercial power, reduces operation cost and improves system operation efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an overall schematic of the present invention.
Detailed Description
The present invention will now be described in more detail with reference to the following examples, but it should be understood that the invention is not limited to the details of the examples set forth herein. 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.
Examples
An integrated comprehensive utilization system for production and storage based on pressure energy power generation comprises an existing natural gas system, a power generation subsystem based on a double-rotor expander, an energy storage subsystem, an energy utilization subsystem and an energy management subsystem, wherein the energy management subsystem is used for intelligently managing the electricity utilization of the energy utilization subsystem and the electricity storage sequence of the energy storage subsystem; the existing natural gas system comprises a high-pressure gas transmission pipeline, an existing pressure regulating system and a medium-pressure urban pipe network which are connected in sequence; the power generation subsystem comprises a double-rotor expander and a generator connected with the double-rotor expander; a branch is led out from an inlet pipeline of the existing pressure regulating system, the double-rotor expander is connected to the branch, the natural gas led out from the branch is subjected to work and pressure reduction by the double-rotor expander, is subjected to pressure regulation by a pressure regulator, is connected to an outlet of the existing pressure regulating system and is converged into the medium-pressure urban pipe network, and meanwhile, the pressure energy released by the pressure reduction of the natural gas drives the double-rotor expander to generate power so as to drive the generator to generate electric energy; the generator, the energy storage subsystem and the energy utilization subsystem share an alternating current bus;
wherein, the flow of the existing pressure regulating system is 8000-10000 Nm3H, inlet pressure 3.7MPa, inlet temperature 15 ℃ and outlet pressure 0.35 MPa. And because the flow in the pressure regulating station fluctuates due to the non-uniformity of the downstream gas use in the pressure regulating process of the natural gas, the flow of the natural gas inlet of the branch where the double-rotor expansion machine is positioned is regulated to 2500Nm3And h, the flow rate is less than the minimum gas using working condition flow rate of the pressure regulating station, so that the expander can work stably and continuously and stably output electric energy. At the same time, the day of the branchThe inlet pressure of the natural gas is 1.8MPa, the inlet temperature is 15 ℃, the outlet pressure is 0.73MPa and the outlet temperature is-29 ℃ after the double-rotor expander works and reduces the pressure.
The energy storage subsystem comprises a rectifier, an energy storage battery and an inverter which are connected in sequence; the rectifier rectifies alternating current output by the generator set into direct current and stores the direct current into the energy storage battery; and the inverter converts the direct current output by the rectifier or the energy storage battery into alternating current with stable voltage and frequency and then outputs the alternating current to the energy utilization subsystem. Wherein the rectifier power is 20 kW; the energy storage battery is formed by a group of 100kWh battery stacks, the rated total capacity is 108.8kWh, 680 nodes of 50Ah lithium batteries are adopted, and 680 x 3.2 x 50 is 108.8 kWh; the conversion efficiency of the energy storage system is about 92%, and the actual power of the system is 108.8kWh multiplied by 0.92 to 100 kWh; the power of the inverter is 100 kW.
The energy storage subsystem is connected with the energy management subsystem through an alternating current bus; the energy management subsystem comprises an alternating current contactor, a PLC (programmable logic controller), an energy management system and a current detection device which are connected; the energy management subsystem dynamically controls the output power of the inverter through an intelligent control strategy according to the load condition, and intelligently schedules the electric power among the pipeline natural gas pressure energy power generation, the distribution network, the battery energy storage system and the charging pile; the energy management subsystem charges the battery at the power consumption valley according to the power supply peak-valley characteristic, stores redundant electric energy, feeds back energy to the alternating current bus to supply the direct current to fill the electric pile or other loads to use power at the power consumption peak, and can smooth the fluctuation of the pressure energy generator. The energy utilization subsystem comprises power utilization equipment of voltage regulation station processes, life and the like, a new energy charging pile, a variable power resistance cabinet and a fixed power resistance cabinet; the electric equipment, the new energy charging pile and the variable power resistance cabinet are connected in parallel; the fixed power resistance cabinet is directly connected with the generator through the alternating current contactor. Furthermore, the electric equipment and the new energy charging pile are normal energy equipment; the variable power resistor cabinet and the fixed power resistor cabinet are emergency power consumption equipment. The power utilization equipment is a normal load, the power is 5kW and is lower than the power generation power of the power generation subsystem; the new energy charging pile is intermittent power utilization equipment, has the power of 60kW, and can provide charging service for two new energy automobiles at the same time; the variable power resistor cabinet is an emergency load, the power adjustable range is 0-20 kW, and the actual load can be automatically adjusted according to the load change of a power generation end and a power utilization end of a system so as to meet the requirement of complete consumption of the load of the power generation end; the fixed power resistance cabinet is emergent load, and power is 20kW, with generator output is the same.
The power utilization loads in the system comprise technical and life normal loads in the voltage regulation station, charging equipment (electric vehicle charging piles and electric vehicle charging piles, dynamic loads), energy storage batteries (balance loads) and load resistance cabinets (emergency loads). In order to ensure that the power generation load is matched with the total load of the normal load, the dynamic load, the balance and the emergency load, the power consumption among all the power consumption equipment and the charge-discharge mode of the energy storage battery are logically controlled by the arranged PLC.
The system operation strategy of the invention is as follows:
1. when the total load (normal load and dynamic load) of the electric equipment is lower than the power generation load, the power system in the station is disconnected with the urban power grid, the electric equipment is completely supplied by the pressure energy power generation system, the redundant electric quantity is converted into direct current through the rectifier and is input into the energy storage battery for storage, and the peak clipping is carried out on the electric equipment by charging the energy storage battery pack, so that the system is balanced. Namely:
for production (normal load + dynamic load) + storage (balanced load) (1)
2. When the energy storage battery pack is full or the power generation load is surplus, namely the power generation and storage are unbalanced, the surplus power is released through the variable power resistor cabinet, and the resistor cabinet emergently releases electric energy for peak clipping, so that the system balance is achieved. Namely, it is
Yield is equal to use (normal load + dynamic load) + store (balanced load) + emergency load (2)
3. Under extreme conditions, when the normal load, the dynamic load and the energy storage battery pack are all in no load, in order to ensure the load balance of the system, the pressure energy power generation subsystem operates stably, and the power generation load is completely consumed by the load resistance cabinet, namely
Produce as emergency load (3)
4. When the total load (normal load and dynamic load) of the electric equipment is higher than the load which can be provided by the pressure energy power generation equipment, the PLC controller sends an instruction to the energy storage battery, and the stored electric energy is converted into alternating current by the inverter and then is output to supply power to the electric equipment; the system is balanced by releasing stored electric energy to fill in the valley. Namely:
for birth and storage (4)
5. And if the energy storage battery pack still has insufficient electric energy after releasing the electric energy, the load is filled by accessing the urban network and supplementing the electric energy by the urban network, so that the requirements of dynamic load and normal load are met. Namely:
produce + commercial power (5)
Basic principles for ensuring the system load of the invention:
1. ensuring the stable operation of the pressure energy power generation device, reducing fluctuation range, and striving to maintain the power generation load to operate between 70% and 95% of rated power;
2. the frequent start and stop of the pressure energy power generation subsystem are avoided, and the high efficiency of the power generation system is maintained;
3. the stored electric energy of the energy storage battery is released in time, and the energy storage battery pack is in a lower energy storage position in a normal state;
4. the operation of the variable power emergency resistance cabinet is avoided as much as possible or the variable power emergency resistance cabinet is operated under low load, so that the effective utilization of electric energy is ensured;
5. ensuring that the power generation load is less than or equal to the total load (grid connection and no network connection);
6. if necessary, the pressure energy power generation load is adjusted to reach the balance for production and storage.
The working principle or process of the invention is as follows:
3.7MPa natural gas (flow is 8000-10000 Nm) of an upstream gas transmission pipeline3The natural gas is led into a pressure regulating station through a pipeline, is subjected to pressure reduction to 0.35MPa through a main path high-medium pressure regulator and then enters an urban medium-pressure transmission and distribution pipe network, a bypass pipe (namely a leading-out branch) is arranged at an opening on the main path, the high-pressure natural gas is led into a double-rotor expander, the volume is increased to apply work outwards along with the expansion and pressure reduction of the natural gas, and a generator is driven to drive mechanical energyAnd converted into electric energy.
After the system operates, the power of the pressure energy power generation subsystem is 20kW, the output voltage is 380V, the frequency is 50Hz, the alternating current contactor is connected to K2, the energy management system carries out intelligent scheduling on system electric energy through signal detection and logic judgment, and controls the charging and discharging and current inversion of the energy storage battery, so that the following energy utilization/energy storage sequence of pressure energy power generation is realized: 1. conventional power utilization equipment for processes and life in the voltage regulating station; 2. a new energy charging pile; 3. an energy storage battery; 4. a variable power resistor cabinet; 5. and fixing the power resistor cabinet. Meanwhile, the energy management system monitors the current of the generator end and the current of the load end, when the power of the generator end is higher than that of the load end and the charging state of the energy storage battery is 100, the energy management system sends an instruction to the energy storage system to enable the charging circuit to stop working, the PLC controls the load resistance cabinets to be put into operation in groups (the power adjustable range is 0-20 kW), and surplus power generated by the rotor expander by utilizing pressure energy is consumed; when the output power of the generator end is lower than the power demand of the load end, the PLC controller disconnects the load resistance cabinet, a grid-connected switch is closed, the mains supply network is connected to a system for supplying power, and the power required by the load end (station equipment and the new energy charging pile) is provided by the generator and the mains supply network together.
The pressure energy generator outputs alternating current which is converted into direct current by the 20kW rectifier and then is divided into two paths, one path is connected to an energy storage battery with the capacity of 100kWh, the energy management system transmits battery information to the energy storage converter, and the energy storage converter discharges the battery according to a command and receives the command sent by the energy management system to realize charging and discharging control; and the other path of the power is converted into 220V and 50Hz alternating current through a 100kW inverter and supplies power to energy utilization equipment.
The pressure energy generating set normally operates, the detection device detects that the current of the system flows to the commercial power network, the energy management system is disconnected from the commercial power network through the PLC, and the system operates in an isolated network mode. The power generation load supply station equipment of the generator, the new energy charging pile and the energy storage battery pile are used.
The power generation energy generating set is stable in operation condition, the power generation load is 20kW, 16kW of surplus power is provided on the basis of meeting the 4kW requirement of the power load of the equipment for the normal station, when the detection device detects that surplus power is uploaded to a mains power grid, a grid-connected switch is tripped, and at the moment, the system is in off-grid operation. When the system power load only has station power utilization equipment, the energy management system ensures the storage of the output electric energy of the generator set during the power utilization valley by controlling the charging of the energy storage battery; when intermittent power utilization load-new energy charging pile is put into operation, the generator supplies electric energy to the charging pile, and meanwhile, the energy management system controls the energy storage battery to discharge and supply power to the charging pile together.
When the new energy charging pile runs at a high load, the energy management system controls the commercial power network to be connected with the system because the energy storage battery discharges slowly or the charging state of the energy storage battery is 0, and the commercial power and the pressure energy generating set supply power to the power load together, so that the charging efficiency of the new energy charging pile is not influenced in the peak power utilization period.
When new forms of energy fill electric pile no load and energy storage battery full load, energy storage system or distribution system trouble, energy management system detects there is unnecessary electric quantity, and the PLC controller control ac contactor closes to K1, and the generator electric quantity is whole to be absorbed (power is 20kW) by fixed power resistance case, ensures that generating set continuously operates, and the natural gas pressure drop, the flow stability of this branch road of flowing through do not influence the steady work of natural gas pressure regulating station.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The integrated comprehensive utilization system for production and storage based on pressure energy power generation is characterized by comprising an existing natural gas system, a power generation subsystem based on a double-rotor expander, an energy storage subsystem, an energy utilization subsystem and an energy management subsystem, wherein the energy management subsystem is used for intelligently managing the electricity utilization of the energy utilization subsystem and the electricity storage sequence of the energy storage subsystem; the existing natural gas system comprises a high-pressure gas transmission pipeline, an existing pressure regulating system and a medium-pressure urban pipe network which are connected in sequence; the power generation subsystem comprises a double-rotor expander and a generator connected with the double-rotor expander; a branch is led out from an inlet pipeline of the existing pressure regulating system, the double-rotor expander is connected to the branch, the natural gas led out from the branch is subjected to work and pressure reduction by the double-rotor expander, is subjected to pressure regulation by a pressure regulator, is connected to an outlet of the existing pressure regulating system and is converged into the medium-pressure urban pipe network, and meanwhile, the pressure energy released by the pressure reduction of the natural gas drives the double-rotor expander to generate power so as to drive the generator to generate electric energy; the generator, the energy storage subsystem and the energy utilization subsystem share an alternating current bus.
2. The pressure energy power generation-based production and storage integrated comprehensive utilization system as claimed in claim 1, wherein the flow rate of the existing pressure regulating system is 8000-10000 Nm3H, the inlet pressure is 3.7MPa, the inlet temperature is 15 ℃, and the outlet pressure is 0.35 MPa; the natural gas flow of the branch is 2500Nm3H; the inlet pressure is 1.8MPa, the inlet temperature is 15 ℃, the outlet pressure is 0.73MPa after the work of the double-rotor expander is performed and the pressure is reduced, and the outlet temperature is-29 ℃.
3. The integrated comprehensive utilization system for production and storage based on pressure energy power generation as claimed in claim 1, wherein the energy storage subsystem comprises a rectifier, an energy storage battery and an inverter which are connected in sequence; the rectifier rectifies alternating current output by the generator set into direct current and stores the direct current into the energy storage battery; and the inverter converts the direct current output by the rectifier or the energy storage battery into alternating current with stable voltage and frequency and then outputs the alternating current to the energy utilization subsystem.
4. The integrated power generation and storage system based on pressure energy power generation as claimed in claim 3, wherein the rectifier power is 20 kW; the power of the inverter is 100 kW.
5. The integrated production and storage comprehensive utilization system for generating power based on pressure energy as claimed in claim 3 or 4, wherein the energy storage battery is a group of 100kWh cell stacks.
6. The integrated comprehensive utilization system for production and storage based on pressure energy power generation as claimed in claim 1, wherein the energy storage subsystem is connected with the energy management subsystem through an alternating current bus; the energy management subsystem comprises an alternating current contactor, a PLC (programmable logic controller), an energy management system and a current detection device which are connected.
7. The integrated production and storage comprehensive utilization system based on pressure energy power generation is characterized in that the energy utilization subsystem comprises power utilization equipment of voltage-regulating station processes, life and the like, a new energy charging pile, a variable power resistance cabinet and a fixed power resistance cabinet; the electric equipment, the new energy charging pile and the variable power resistance cabinet are connected in parallel; the fixed power resistance cabinet is directly connected with the generator through the alternating current contactor.
8. The pressure energy power generation-based production and storage integrated comprehensive utilization system is characterized in that the electric equipment and the new energy charging pile are normal energy equipment; the variable power resistor cabinet and the fixed power resistor cabinet are emergency power consumption equipment.
9. The integrated power generation and storage integrated comprehensive utilization system based on pressure energy power generation as claimed in claim 7 or 8, wherein the electric equipment is a normal load, the power is 5kW, and the power is lower than the power generation power of the power generation subsystem; the new energy charging pile is intermittent electric equipment, and the power is 60 kW; the variable power resistor cabinet is an emergency load, the power adjustable range is 0-20 kW, and the actual load can be automatically adjusted according to the load change of a power generation end and a power utilization end of the system; the fixed power resistance cabinet is emergency load, and the power is 20 kW.
10. The pressure energy power generation-based production and storage integrated comprehensive utilization system is characterized in that the new energy charging pile can charge at least two new energy vehicles at the same time.
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| CN112746868A (en) * | 2021-01-20 | 2021-05-04 | 佛山玄同科技有限公司 | Charging system based on natural gas pipeline pressure energy recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112746868A (en) * | 2021-01-20 | 2021-05-04 | 佛山玄同科技有限公司 | Charging system based on natural gas pipeline pressure energy recovery |
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