Comprehensive utilization system for throttling loss of natural gas pipeline

Abstract

The invention provides a natural gas pipeline throttling loss comprehensive utilization system which comprises a natural gas inlet pipeline, a pressure energy recovery unit, a cold energy recovery unit and an emergency branch pipeline, the pressure energy recovery unit comprises rotor equipment, the rotor equipment is connected with a universal coupling, and the universal coupling is connected with a power generator; the cold energy recovery unit comprises a refrigerating machine, the refrigerating machine is connected with the end face inlet end of a heat exchanger A, the side face outlet end of the heat exchanger A is connected with an ice making machine, the ice making machine is connected with the bottom face inlet end of a heat exchanger B, the left side outlet end of the heat exchanger B is connected with an air conditioner, and the air conditioner is connected with a water pump. The water pump is connected with the top inlet end of the heat exchanger B. The right outlet end of the heat exchanger B is connected with the side inlet end of the heat exchanger A. The natural gas pressure energy is utilized for power generation, the generated throttling loss cold energy is utilized, the loss energy generated by throttling is utilized to the maximum extent, and the energy consumption in the production and operation process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy recovery, in particular to a natural gas pipeline throttling loss comprehensive utilization system. BACKGROUND

[0002] As a technology for recovering and utilizing pressure energy in industrial processes, the pressure utilization technology is an important measure for throttling loss governance. The pressure power generation technology fully utilizes the pressure energy of fluid to generate electricity. This technology can effectively solve the problems of pipeline vibration, noise and ice blockage caused by rapid cooling during natural gas pressure regulation, fully utilize the internal energy of natural gas and does not produce pollution, and meets the zero emission standard.

[0003] At present, natural gas is mainly transported through a pipeline network system. During the transportation of natural gas, a large amount of pressure energy is released during the pressure regulation of high-pressure natural gas. In China, the pressure reduction process of natural gas is mainly adjusted and stabilized by a pressure regulating station to regulate the pressure of the upstream high-pressure and sub-high-pressure pipeline network natural gas into the medium-pressure pipeline network. During this process, most of the pressure energy is wasted. When the pipeline network pressure is 10 MPa and the user end pressure is 0.8 MPa, the pipeline network contains a large amount of pressure energy, and the maximum recoverable pressure energy is 359.12 kJ / kg. If this part of energy can be recovered, the energy utilization rate of natural gas and the safety of natural gas pipeline network operation will be greatly improved. High-pressure purified natural gas entering the user terminal often needs to go through a pressure regulation process of "high pressure-medium pressure-low pressure", and the energy waste caused by pressure drop is very large. If the pressure energy of the natural gas pipeline network can be recovered, the energy utilization rate and the economy of natural gas pipeline transportation can be effectively improved. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a natural gas pipeline throttling loss comprehensive utilization system. The energy loss generated by the throttling of the existing pipeline through the valve is recovered, the natural gas pressure energy is utilized for power generation, and the throttling loss cold energy is utilized, so as to maximize the utilization of the loss energy generated by throttling and reduce the energy consumption in the production and operation process.

[0005] The technical scheme adopted by the present application to solve the technical problem is:

[0006] A natural gas pipeline throttling loss comprehensive utilization system, comprising an inlet pipeline of natural gas, a pressure energy recovery unit, a cold energy recovery unit and an emergency branch pipeline, wherein the pressure energy recovery unit comprises a rotor device, the rotor device is connected with a universal joint, and the universal joint is connected with a generator.

[0007] The cold energy recovery unit comprises a refrigerating machine, an end face inlet end of a heat exchanger A connected with the refrigerating machine, an ice maker connected with a side face outlet end of the heat exchanger A, a bottom face inlet end of a heat exchanger B connected with the ice maker, an air conditioner connected with a left side outlet end of the heat exchanger B, a water pump connected with the air conditioner, a top face inlet end of the heat exchanger B connected with the water pump, and a right side outlet end of the heat exchanger B connected with a side face inlet end of the heat exchanger A.

[0008] A hydrophobic valve and a filter connected in sequence are further included, an inlet end of the filter is connected with the flow guide valve, and the hydrophobic valve is connected with an inlet pipeline of the natural gas.

[0009] An inlet end of a flow stabilizer is connected with an end face outlet end of the heat exchanger A, and an outlet end of the flow stabilizer is connected with an outlet pipeline of the natural gas.

[0010] One end of an emergency branch pipeline is connected with the outlet pipeline of the natural gas, the other end is connected with the inlet pipeline of the natural gas, and a pressure regulating valve is arranged on the emergency branch pipeline.

[0011] An electric ball valve is connected on the natural gas pipeline, and the generator is connected with the ice maker through a wire.

[0012] The electric ball valve is two, one is arranged at the inlet end of the hydrophobic valve, and the other is arranged on the emergency branch pipeline.

[0013] The rotor device comprises an air inlet and an air outlet, the air inlet is connected with an outlet end of the flow guide valve, and the air outlet is connected with the refrigerating machine.

[0014] A rotating shaft is arranged in the rotor device, and an impeller is connected on the rotating shaft.

[0015] The impeller is composed of multiple stages of blades, the first stage of blades is communicated with the air inlet, and the last stage of blades is communicated with the air outlet.

[0016] The beneficial effects of the present application are:

[0017] 1. The natural gas pressure difference is used for power generation, which not only fully utilizes the natural gas pressure energy and improves the energy utilization rate, but also solves the problem of cold energy recovery and utilization, recovers the energy loss generated by the existing pipeline through the valve, generates power by using the natural gas pressure energy, and utilizes the cold energy generated by the throttling loss, maximizes the utilization of the loss energy generated by throttling, reduces the energy consumption in the production operation process, simultaneously stores energy through the battery, alleviates the problem of power surplus and deficiency of natural gas pressure energy power generation, and realizes gas-electricity-storage-cold multi-energy complementary utilization, which is an environmentally friendly and low-carbon process scheme.

[0018] 2. The condensed water in the inlet pipeline is continuously discharged outside the pipeline through the hydrophobic valve to achieve the purpose of automatic steam drainage, preventing water from corroding the power generation equipment; through the filter, the solid impurities contained in the natural gas are separated to reduce the wear and damage of mechanical equipment and avoid causing failure; through the electric ball valve, conduction is carried out when the pressure energy recovery unit fails to prevent the upstream and downstream of the pipeline from being interrupted.

[0019] 3. By superimposing power at each level on the power output main shaft, the vector synthesis output of torque is realized, the power output shaft realizes the output of rotating speed through the universal coupling, so as to start the generator, convert the natural gas pressure energy into mechanical energy of the power generation equipment, and cut the magnetic induction line driven by the rotor to generate electricity. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the connection structure schematic diagram of the application;

[0021] Fig. 2 is the connection structure schematic diagram of the pressure energy recovery unit;

[0022] Fig. 3 is the connection structure schematic diagram of the cold energy recovery unit;

[0023] Fig. 4 is the structure schematic diagram of the rotor equipment;

[0024] Fig. 5 Impeller torque transmission diagram.

[0025] Shown in the figure: 1-pressure energy recovery unit, 2-cold energy recovery unit, 3-hydrophobic valve, 4-filter, 5-flow valve, 6-flow stabilizer, 7-pressure regulating valve, 8-rotating shaft, 9-impeller, 10-, 11-rotor equipment, 12-universal coupling, 13-generator, 14-impeller, 21-refrigerator, 22-heat exchanger A, 23-ice maker, 24-heat exchanger B, 25-air conditioner, 26-water pump. DETAILED DESCRIPTION

[0026] The application will be further described below in combination with the drawings and examples.

[0027] Example 1

[0028] As Figs. 1 to 5 shown, a natural gas pipeline throttling loss comprehensive utilization system includes a natural gas inlet pipeline, a pressure energy recovery unit 1, a cold energy recovery unit 2 and an emergency branch pipeline, the pressure energy recovery unit 1 includes a rotor equipment 11, the rotor equipment 11 is connected with a universal coupling 12, and the universal coupling 12 is connected with a generator 13;

[0029] The cold energy recovery unit 2 comprises a refrigerating machine 21, an end face inlet end of which is connected with a heat exchanger A 22, a side face outlet end of the heat exchanger A 22 is connected with an ice maker 23, a bottom face inlet end of the ice maker 23 is connected with a heat exchanger B 24, a left side outlet end of the heat exchanger B 24 is connected with an air conditioner 25, the air conditioner 25 is connected with a water pump 26, the water pump 26 is connected with a top face inlet end of the heat exchanger B 24, and a right side outlet end of the heat exchanger B 24 is connected with a side face inlet end of the heat exchanger A 22.

[0030] Further comprising a hydrophobic valve 3 and a filter 4 connected in sequence, an inlet end of a flow guide valve 5 is connected with the filter 4, and the hydrophobic valve 3 is connected with an inlet pipeline of natural gas.

[0031] An inlet end of a flow stabilizer 6 is connected with an end face outlet end of the heat exchanger A 22, and an outlet end of the flow stabilizer 6 is connected with an outlet pipeline of natural gas.

[0032] One end of the emergency branch pipeline is connected with the outlet pipeline of natural gas, the other end is connected with the inlet pipeline of natural gas, and a pressure regulating valve 7 is arranged on the emergency branch pipeline.

[0033] An electric ball valve is connected on the natural gas pipeline, and the generator 13 is connected with the ice maker 23 through a wire.

[0034] The electric ball valve is two, one is arranged at the inlet end of the hydrophobic valve 3, and the other is arranged on the emergency branch pipeline.

[0035] The rotor device 11 comprises an air inlet and an air outlet, the air inlet is connected with an outlet end of the flow guide valve 5, and the air outlet is connected with the refrigerating machine 21.

[0036] A rotating shaft 8 is arranged in the rotor device 11, and an impeller 9 is connected on the rotating shaft 8.

[0037] The impeller 9 is composed of multiple stages of blades, the first stage of blades is communicated with the air inlet, and the last stage of blades is communicated with the air outlet.

[0038] The multiple stages of blades are all connected with connecting planetary gears, the planetary gears are connected with a main gear, the main gear is engaged with the planetary gears, and the main gear is connected with a universal joint 12 through a power output shaft.

[0039] The natural gas pressure difference is used for power generation, which not only fully utilizes the natural gas pressure energy and improves the energy utilization rate, but also solves the problem of cold energy recycling and utilization, recycles the energy loss generated by the existing pipeline through the valve throttling, uses the natural gas pressure energy for power generation, and utilizes the throttling loss cold energy, maximizes the utilization of the loss energy generated by throttling, reduces the energy consumption in the production operation process, simultaneously stores energy through the battery, solves the problems of power surplus and deficiency of the natural gas pressure energy power generation, realizes the gas-electricity-storage-cold multi-energy complementary utilization, and is an environmentally friendly and low-carbon process scheme.

[0040] A drain valve 3 is arranged in front of the pressure energy recovery unit 1, which continuously discharges the condensate water in the inlet pipeline to the outside of the pipeline to achieve the purpose of automatic steam drainage, prevents the corrosion of the water to the power generation equipment, and installs a filter 4 behind the drain valve 3, which blocks the solid impurities contained in the natural gas to reduce the wear and damage of the mechanical equipment, avoids causing faults, and the filter 4 is a replaceable device, which is convenient for daily maintenance and replacement. An emergency branch pipeline is arranged in front of the drain valve 3 and is provided with an electric ball valve, which is connected when the pressure energy recovery unit 1 fails to prevent the upstream and downstream of the pipeline from being disconnected.

[0041] The high-pressure natural gas in the inlet pipeline enters the gas inlet of the rotor equipment 11, and the pressure difference in the pipeline drives the impeller 9 to rotate, the impeller 9 drives the rotating shaft 8 to rotate, the blade 9 is connected with the planetary gear through the rotating shaft 8, the first-stage blade is communicated with the gas inlet, and the last-stage blade is communicated with the gas outlet, the pressurized gas passes through the blade 9 in sequence to realize the multi-gradient recovery and utilization of the pressure, each blade has a power output shaft, the planetary gear meshes with the main gear to superimpose the power of each stage on the power output main shaft to realize the vector composition output of the torque, the power output shaft realizes the output of the rotating speed through the universal joint 12, thereby starting the generator 13, converting the natural gas pressure energy into mechanical energy of the power generation equipment, and cutting the magnetic induction line with the rotor driven by the mechanical energy to generate electricity. The generator 13 converts the electric energy into power supply for the use scene through the wire, and the excess enters the battery.

[0042] The cold energy recovery unit 2 is provided with a natural gas stabilizer 6, which stabilizes the natural gas after pressure reduction, reduces the occurrence of turbulent flow of the natural gas after pressure reduction, and improves the stability of the system. The natural gas discharged from the gas outlet of the rotor device 11 enters the gas refrigerator 21, and the cold gas is obtained. The gas refrigerant is exchanged in the heat exchanger 1 (the gas refrigerant enters from the end face inlet end of the heat exchanger A22, and is discharged from the end face outlet end of the heat exchanger A22; the refrigerant A enters from the side face inlet end of the heat exchanger A22, and the refrigerant A is discharged from the side face outlet end of the heat exchanger A2). The gas cold coal and the refrigerant A are exchanged in the heat exchanger 1, the temperature of the gas cold coal is increased, and the temperature of the refrigerant A is decreased. The discharged refrigerant A is used to make ice blocks in the ice maker 23. If the cold energy is not enough during the ice making process, the power generated by the pressure energy recovery unit 1 can be used to supplement. The refrigerant is discharged and then sold. The refrigerant A discharged from the ice maker 23 is cooled to the ambient temperature by the heat exchanger B 24 (the refrigerant A enters from the bottom face inlet end of the heat exchanger B24, and is discharged from the right side outlet end. The refrigerant B enters from the top face inlet end of the heat exchanger B24, and is discharged from the left side outlet end. The heat exchange between the refrigerant A and the refrigerant B is realized. The low-temperature refrigerant A reduces the temperature of the refrigerant B, and then the refrigerant B after temperature reduction enters the air conditioner 25 through 26. The refrigerant B circulates between the air conditioner 25 and the heat exchanger B24. The temperature of the refrigerant A after heat exchange is increased, and then enters the heat exchanger A2. The refrigerant A and the refrigerant B are exchanged to achieve the comfortable temperature of people or equipment. The refrigerant B exchanges the medium cold energy by the water pump 26, reduces the use of electric refrigeration equipment, and the outlet natural gas is discharged from the pressure regulating area after being exchanged twice. Through the above process, the throttling loss of natural gas is comprehensively utilized.

[0043] The natural gas pressure power generation device is a pneumatic motor (when the natural gas in the pipeline meets the flow rate of more than 7000 m3 / h and the pressure ratio of more than 1.2, the power generation device is an expander). The rotor of the power generation device is driven by the pressure difference in the pipeline, and the pressure energy of the natural gas is converted into mechanical energy of the power generation device. The rotor driven by the mechanical energy cuts the magnetic induction lines to generate electricity. The electric energy converted by the power generation unit is stored in the electric energy package composed of the battery through the wire interface or used in the field.

[0044] The drain valve 3 arranged in front of the pressure energy recovery unit 1 continuously discharges the condensed water in the pipeline to the outside of the pipeline, so as to achieve the purpose of automatic steam drainage and prevent the corrosion of the power generation device by water vapor. The drain valve 3 is provided with a filter 4, which separates the solid impurities contained in the natural gas, and reduces the wear and damage of the mechanical equipment.

[0045] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A comprehensive system for utilizing the throttling losses of a natural gas pipeline, comprising a natural gas inlet pipeline, a pressure energy recovery unit (1), a cold energy recovery unit (2), and an emergency tributary pipeline, characterized in that: The pressure energy recovery unit (1) includes a rotor device (11), which is connected to a universal coupling (12), and the universal coupling (12) is connected to a generator (13). The cold energy recovery unit (2) includes a refrigeration unit (21), which is connected to the end face inlet of heat exchanger A (22). The side outlet of heat exchanger A (22) is connected to an ice maker (23), which is connected to the bottom inlet of heat exchanger B (24). The left outlet of heat exchanger B (24) is connected to an air conditioner (25), which is connected to a water pump (26). The water pump (26) is connected to the top inlet of heat exchanger B (24), and the right outlet of heat exchanger B (24) is connected to the side inlet of heat exchanger A (22).

2. The natural gas pipeline throttling loss comprehensive utilization system as described in claim 1, characterized in that: It also includes a steam trap (3) and a filter (4) connected in sequence, the filter (4) being connected to the inlet end of a flow guide valve (5), and the steam trap (3) being connected to the inlet pipeline of natural gas.

3. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 2, characterized in that: The outlet end of the heat exchanger A (22) is connected to the inlet end of the flow stabilizer (6), and the outlet end of the flow stabilizer (6) is connected to the outlet pipeline of natural gas.

4. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 3, characterized in that: One end of the emergency tributary pipeline is connected to the natural gas outlet pipeline, and the other end is connected to the natural gas inlet pipeline. A pressure regulating valve (7) is installed on the emergency tributary pipeline.

5. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 4, characterized in that: An electric ball valve is connected to the natural gas pipeline, and the generator (13) is connected to the ice maker (23) via a wire.

6. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 5, characterized in that: There are two electric ball valves, one of which is installed at the inlet end of the steam trap (3), and the other is installed on the emergency tributary pipeline.

7. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 6, characterized in that: The rotor device (11) includes an air inlet and an air outlet. The air inlet is connected to the outlet end of the flow guide valve (5), and the air outlet is connected to the refrigeration unit (21).

8. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 7, characterized in that: The rotor device (11) is provided with a rotating shaft (8), and an impeller (9) is connected to the rotating shaft (8).

9. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 8, characterized in that: The impeller (9) is composed of multiple stages of blades, with the first stage blades connected to the air inlet and the last stage blades connected to the air outlet.

10. A comprehensive utilization system for throttling losses in natural gas pipelines as described in claim 9, characterized in that: The multi-level Each blade is connected to a planetary gear, which is connected to a main gear. The main gear meshes with the planetary gear. The main gear is connected to the universal coupling (12) via the power output shaft.

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