阅读说明：本技术 一种新型低碳特高压换流站能量利用系统 (Novel low-carbon extra-high voltage converter station energy utilization system ) 是由 陈伟 渠学景 于 2021-08-13 设计创作，主要内容包括：本发明涉及一种新型低碳特高压换流站能量利用系统,其中包括：换流单元、热泵循环单元和有机朗肯循环单元；所述换流单元的出口端与所述热泵循环单元的入口端连接,所述热泵循环单元的出口端与所述换流单元的入口端连接,所述有机朗肯循环单元一端与所述热泵循环单元一端连接；所述换流单元产生的热量通过所述热泵循环单元传递到所述有机朗肯循环单元,所述有机朗肯循环单元将所述热量转化为电量用于所述系统动力部件的运行。本发明极大的减少了能源的浪费,实现能量的回收和利用,有效提高了特高压换流站的经济效益,减少了土地资源和水资源的浪费,实现特高压换流站低碳运行。(The invention relates to a novel low-carbon extra-high voltage converter station energy utilization system, which comprises: the system comprises a conversion unit, a heat pump cycle unit and an organic Rankine cycle unit; the outlet end of the conversion unit is connected with the inlet end of the heat pump circulation unit, the outlet end of the heat pump circulation unit is connected with the inlet end of the conversion unit, and one end of the organic Rankine cycle unit is connected with one end of the heat pump circulation unit; the heat generated by the conversion unit is transferred to the organic Rankine cycle unit through the heat pump cycle unit, and the organic Rankine cycle unit converts the heat into electricity for operation of the system power component. The invention greatly reduces the waste of energy, realizes the recovery and utilization of energy, effectively improves the economic benefit of the extra-high voltage converter station, reduces the waste of land resources and water resources, and realizes the low-carbon operation of the extra-high voltage converter station.)

1. The utility model provides a novel low carbon extra-high voltage converter station energy utilization system which characterized in that includes:

a converter unit (1), a heat pump cycle unit (2) for heat exchange, and an organic Rankine cycle unit (3) for energy conversion;

the outlet end of the conversion unit (1) is connected with the inlet end of the heat pump circulation unit (2), the outlet end of the heat pump circulation unit (2) is connected with the inlet end of the conversion unit (1), and one end of the organic Rankine cycle unit (3) is connected with one end of the heat pump circulation unit (2).

2. The novel low-carbon extra-high voltage converter station energy utilization system according to claim 1, further comprising: the system comprises a main circulating pump (4), a deionization device (5), a nitrogen pressure stabilizing device (6), an electric proportional valve (7), an energy storage device (8), a power generation device (9), a wastewater flash evaporation recovery device (10), a converter transformer fan (11) and an inverter device (12).

3. The novel low-carbon extra-high voltage converter station energy utilization system is characterized in that the core of the converter unit (1) is the extra-high voltage converter valve (101), key heat generating components of the extra-high voltage converter valve (101) comprise a thyristor (1011), a radiator (1012), a damping resistor (1013) and a saturable reactor (1014), the thyristor (1011) is arranged on the radiator (1012), the radiator (1012) and the damping resistor (1013) are connected in parallel with the saturable reactor (1014), and the main circulating pump (4) is connected between the outlet end of the converter unit (1) and the inlet end of the heat pump circulation unit (2).

4. The novel low-carbon extra-high voltage converter station energy utilization system is characterized in that the heat pump cycle unit (2) comprises an evaporator (201), a compressor (202), a heat pump condenser (203) and a throttle valve (204), wherein the evaporator (201) is connected with the compressor (202), the compressor (202) is connected with the heat pump condenser (203), the heat pump condenser (203) is connected with the throttle valve (204), and the throttle valve (204) is connected with the evaporator (201) to form a closed-loop connection.

5. The novel low-carbon extra-high voltage converter station energy utilization system according to claim 2, characterized in that an electric proportional valve (7) is installed between the main circulating pump (4) and the converter unit (1), one end of the electric proportional valve (7) is connected with the inlet end of the main circulating pump (4), the other end of the electric proportional valve is connected with the inlet end of the converter unit (1), and the electric proportional valve (7) is provided with a regulating valve.

6. The novel low-carbon extra-high voltage converter station energy utilization system according to claim 2, wherein the deionization device (5) for adjusting the flow of the cooling medium is installed between the outlet end of the heat pump circulation unit (2) and the inlet end of the converter unit (1), the deionization device (5) is connected with the nitrogen pressure stabilizer (6), and the wastewater flash evaporation recovery device (10) for recycling wastewater is connected with the deionization device (5).

7. The novel low-carbon extra-high voltage converter station energy utilization system according to claim 2, wherein the nitrogen pressure stabilizer (6) is installed between the deionization device (5) and the inlet end of the converter unit (1), and the nitrogen pressure stabilizer (6) comprises a nitrogen cylinder and a pressure reduction valve.

8. The novel low-carbon extra-high voltage converter station energy utilization system is characterized in that one end of the organic Rankine cycle unit (3) is connected with one end of the heat pump cycle unit (2), the organic Rankine cycle unit (3) comprises a high-pressure evaporator (301), an expansion screw machine (302), a cooling medium recoverer (303) and a power pump (304), the high-pressure evaporator (301) is connected with the expansion screw machine (302), the expansion screw machine (302) is connected with the condensation medium recoverer (303), the condensation medium recoverer (303) is connected with the power pump (304), and the power pump (304) is connected with the high-pressure evaporator (301) to form closed-loop connection.

9. The novel low-carbon extra-high voltage converter station energy utilization system as claimed in claim 2, wherein the energy storage device (8) for storing the electricity generated by the organic Rankine cycle unit (3) is connected with one end of the organic Rankine cycle unit (3), and one end of the organic Rankine cycle unit (3) is connected with a converter transformer fan (11).

10. The novel low-carbon extra-high voltage converter station energy utilization system according to claim 2, characterized in that the power generation device (9) for driving the heat pump cycle unit (2) and the organic Rankine cycle unit (3) is connected with an inverter device (12), the inverter device (12) is connected with the heat pump cycle unit (2), and the inverter device (12) is connected with the organic Rankine cycle unit (3).

Technical Field

The invention relates to the field of extra-high voltage alternating current and direct current transmission, in particular to a novel low-carbon extra-high voltage converter station energy utilization system.

Background

The ultra-high voltage alternating current and direct current transmission has wide technical requirements in China, and is an important means for realizing long-distance electric energy transmission, large-scale renewable energy source grid connection and complex power grid control level improvement. With the comprehensive popularization and application of advanced technologies such as extra-high voltage and the like, the power grid is not only a carrier for electric energy transmission in the traditional sense, but also an important means for realizing the purposes of energy saving and carbon reduction in China and promoting the comprehensive coordinated sustainable development in east and west regions, and is also an important component of an energy system in China.

The extra-high voltage alternating current and direct current converter valve is core equipment of extra-high voltage alternating current and direct current transmission engineering and is a core functional unit for realizing alternating current and direct current conversion, and components of the converter valve can generate high heat in the operation process and need to dissipate the heat through a cooling system so as to ensure the safe and reliable operation of a converter station. However, the existing cooling mode is to directly discharge the heat of the converter valve cooling water into the ambient air, which causes great waste of energy, and meanwhile, a cooler needs to be separately configured, which indirectly consumes land resources and water resources and causes environmental pollution.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a novel low-carbon extra-high voltage converter station energy utilization system, which comprises:

a converter unit 1, a heat pump cycle unit 2 for heat exchange, and an organic rankine cycle unit 3 for energy conversion;

the outlet end of the conversion unit 1 is connected with the inlet end of the heat pump circulation unit 2, the outlet end of the heat pump circulation unit 2 is connected with the inlet end of the conversion unit 1, and one end of the organic Rankine cycle unit 3 is connected with one end of the heat pump circulation unit 2.

Preferably, the novel low-carbon extra-high voltage converter station energy utilization system further comprises: the system comprises a main circulating pump 4, a deionization device 5, a nitrogen pressure stabilizing device 6, an electric proportional valve 7, an energy storage device 8, a power generation device 9, a wastewater flash evaporation recovery device 10, a converter transformer fan 11 and an inverter device 12.

Preferably, the core of the converter unit 1 is the extra-high voltage converter valve 101, key heat generating components of the extra-high voltage converter valve 101 include a thyristor 1011, a radiator 1012, a damping resistor 1013 and a saturable reactor 1014, the thyristor 1011 is arranged on the radiator 1012, the radiator 1012 and the damping resistor 1013 are connected in parallel with the saturable reactor 1014, and the main circulation pump 4 is connected between the outlet end of the converter unit 1 and the inlet end of the heat pump cycle unit 2.

Preferably, the heat pump cycle unit 2 includes an evaporator 201, a compressor 202, a heat pump condenser 203 and a throttle valve 204, the evaporator 201 is connected to the compressor 202, the compressor 202 is connected to the heat pump condenser 203, the heat pump condenser 203 is connected to the throttle valve 204, and the throttle valve 204 is connected to the evaporator 201 to form a closed loop connection.

Preferably, an electric proportional valve 7 is installed between the main circulating pump 4 and the commutation unit 1, one end of the electric proportional valve 7 is connected with the inlet end of the main circulating pump 4, the other end of the electric proportional valve 7 is connected with the inlet end of the circulation unit 1, and the electric proportional valve 7 is provided with a regulating valve.

Preferably, the deionization device 5 for adjusting the flow rate of the cooling medium is installed between the outlet end of the heat pump cycle unit 2 and the inlet end of the converter unit 1, the deionization device 5 is connected with the nitrogen pressure stabilizing device 6, and the wastewater flash evaporation recovery device 10 for recycling wastewater discharged by the deionization device 5 is connected with the deionization device 5.

Preferably, the nitrogen gas pressure stabilizer 6 is installed between the deionization unit 5 and the inlet end of the converter unit 1, and the nitrogen gas pressure stabilizer 6 comprises a nitrogen gas cylinder and a pressure reduction valve.

Preferably, one end of the organic rankine cycle unit 3 is connected with one end of the heat pump cycle unit 2, the organic rankine cycle unit 3 includes a high-pressure evaporator 301, an expansion screw machine 302, a cooling medium recoverer 303 and a power pump 304, the high-pressure evaporator 301 is connected with the expansion screw machine 302, the expansion screw machine 302 is connected with the condensation medium recoverer 303, the condensation medium recoverer 303 is connected with the power pump 304, and the power pump 304 is connected with the high-pressure evaporator 301 to form closed-loop connection.

Preferably, the energy storage device 8 for storing the electric energy generated by the organic rankine cycle unit 3 is connected to one end of the organic rankine cycle unit 3, and one end of the organic rankine cycle unit 3 is connected to the converter transformer fan 11.

Preferably, the power generation device 9 for driving the heat pump cycle unit 2 and the organic rankine cycle unit 3 is connected to an inverter device 12, the inverter device 12 is connected to the heat pump cycle unit 2, and the inverter device 12 is connected to the organic rankine cycle unit 3.

Based on this, the beneficial effects of the invention are:

(1) the invention recycles the heat in the cooling medium discharged from the extra-high voltage converter valve, greatly reduces the energy waste, greatly improves the operation economic benefit of the extra-high voltage converter station, cancels the application of a closed cooling tower and an air cooler, and reduces the waste of land resources and water resources.

(2) Through the matching design of the heat pump circulation unit, the organic Rankine cycle unit and the electric proportional valve, the constant temperature of a cooling medium of the high-pressure converter valve is ensured to the maximum extent, and the operation reliability of key components such as a thyristor, a damping resistor, a saturable reactor and the like is improved.

(3) The novel low-carbon high-voltage converter station energy utilization system can dynamically coordinate the operation relation of each system according to environmental conditions, greatly reduce the emission of carbon dioxide of a high-voltage converter station, and realize low-carbon operation of an extra-high voltage converter station.

Drawings

FIG. 1 is a schematic diagram of an energy utilization system of a novel low-carbon extra-high voltage converter station according to an embodiment of the invention;

FIG. 2 is a schematic diagram of an extra-high voltage converter valve provided by an embodiment of the invention;

FIG. 3 is a schematic diagram of a heat pump cycle provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of an organic Rankine cycle unit provided by an embodiment of the invention.

The system comprises a converter unit 1, a heat pump cycle unit 2, an organic Rankine cycle unit 3, a main circulation pump 4, a deionization device 5, a nitrogen pressure stabilizing device 6, an electric proportional valve 7, an energy storage device 8, a power generation device 9, a wastewater flash evaporation recovery device 10, a converter transformer fan 11, an inverter device 12, an extra-high pressure converter valve 101, a thyristor 1011, a radiator 1012, a damping resistor 1013, a saturable reactor 1014, an evaporator 201, a compressor 202, a heat pump condenser 203, a throttle valve 204, a high-pressure evaporator 301, an expansion screw machine 302, a condensing medium recoverer 303 and a power pump 304.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.

This embodiment provides a novel extra-high voltage converter station energy utilization system of low carbon, as shown in fig. 1, a novel extra-high voltage converter station energy utilization system of low carbon includes: the system comprises a conversion unit 1, a heat pump cycle unit 2, an organic Rankine cycle unit 3, a main circulation pump 4, a deionization device 5, a nitrogen pressure stabilizing device 6, an electric proportional valve 7, an energy storage device 8, a power generation device 9, a wastewater flash evaporation recovery device 10, a converter transformer fan 11 and an inverter device 12, wherein heat generated by the conversion unit 1 is transmitted to the organic Rankine cycle unit 3 through the heat pump cycle unit 2, and the organic Rankine cycle unit 3 converts the heat into electric quantity for operation of the system power components.

Specifically, as shown in fig. 2, the core of the converter unit 1 is an extra-high voltage converter valve 101, the extra-high voltage converter valve 101 is a core device of an extra-high voltage direct current transmission project, and is a core function part for realizing alternating current and direct current conversion, key heat generating components of the extra-high voltage converter valve 101 include a thyristor 1011, a radiator 1012, a damping resistor 1013, and a saturable reactor 1014, and components of the extra-high voltage converter valve 101 generate high heat in the operation process. The thyristor 1011 is connected to a heat sink 1012, and the heat sink 1012, the damping resistor 1013, and the saturable reactor 1014 are connected in parallel. The cooling medium used for cooling in the extra-high voltage converter valve 101 is deionized water with the electric conductivity lower than 0.03 mu s/cm, heat generated by the thyristor 1011 is transferred to the radiator 1012 in a heat conduction mode, the radiator 1012 transfers heat to the cooling medium in a heat convection mode, and heat generated by the damping resistor 1013 and the saturable reactor 1014 is directly transferred to the cooling medium in a heat convection mode.

The main circulation pump 4 is connected between the outlet end of the converter unit 1 and the inlet end of the heat pump circulation unit 2, and the cooling medium flows out of the high-pressure converter valve 101 and enters the heat pump circulation unit 2 through the main circulation pump 4. The main circulation pump 4 is a power component of the system, the main circulation pump 4 provides power for the flow of the cooling medium in the extra-high voltage converter valve 101, the flow resistance of the cooling medium in the radiator 1012, the damping resistor 1013 and the saturable reactor 1014 is overcome, and the lift of the main circulation pump 4 is selected to be in a range of 1.05-1.1 times of the flow resistance of the branch of the radiator 1012.

As shown in fig. 3, the heat pump cycle unit 2 includes an evaporator 201, a compressor 202, a heat pump condenser 203, and a throttle valve 204, an inlet end of the heat pump cycle unit 2 is connected to the main circulation pump 4, and an outlet end of the heat pump cycle unit 2 is connected to an inlet end of the commutation unit 1. The evaporator 201 is connected with the compressor 202, the compressor 202 is connected with the heat pump condenser 203, the heat pump condenser 203 is connected with the throttle valve 204, and the throttle valve 204 is connected with the evaporator 201 to form closed loop connection. The cooling medium flowing out of the extra-high voltage converter valve 101 flows through the main circulation pump 4 and enters the heat pump circulation unit 2, the heat pump circulation unit 2 absorbs heat in the cooling medium through the evaporator 201, the heat absorbed by the evaporator 201 is transferred to the heat pump condenser 203 through the action of the compressor 202, and the compressor 202 provides power for the heat transfer. The heat is released in the heat pump condenser 203 to heat the circulating water.

The cooling medium absorbs heat generated by the operation of the thyristor 1011, the damping resistor 1012 and the saturable reactor 1013 in the converter unit 1, the temperature is raised to 60-65 ℃, the cooling medium flows out of the extra-high voltage converter valve 101, flows into the heat pump circulation unit 2, the temperature is reduced to 35-40 ℃ after heat exchange, and the cooling medium flows back into the converter unit 1 again for circulation flow.

A deionization device 5 is arranged between the outlet end of the heat pump circulation unit 2 and the inlet end of the converter unit 1, the deionization device 5 is used for ensuring that the conductivity of the cooling medium meets the operation requirement, and a part of the cooled cooling medium firstly flows through the deionization device 5 and then enters the converter unit 1. And a regulating valve is arranged in the deionization device 5, and the flow of the cooling medium is regulated in real time according to the conductivity of the cooling medium in the system, so that the conductivity of the cooling medium is ensured to meet the requirement of system operation. Deionization device 5 connects waste water flash distillation recovery unit 10, flows into waste water flash distillation recovery unit 10 by deionization device 5 exhaust waste water, waste water flash distillation recovery unit 10 carries out recovery processing to waste water, realizes zero sewage discharge.

And a nitrogen pressure stabilizing device 6 is arranged between the outlet end of the heat pump circulation unit 2 and the inlet end of the flow conversion unit 1, the nitrogen pressure stabilizing device 6 is connected with the deionization device 5, and a part of the cooled cooling medium flows through the deionization device 5, then flows through the nitrogen pressure stabilizing device 6 and then flows into the flow conversion unit 1. The nitrogen gas pressure stabilizing device 6 is used for ensuring that the system pressure meets the operation requirement, the nitrogen gas pressure stabilizing device 6 comprises a nitrogen gas bottle and a pressure reducing valve, the nitrogen gas bottle is used for storing nitrogen gas, and the pressure reducing valve is used for adjusting the opening degree of the valve according to the pressure in the system in real time to ensure the pressure balance in the system.

An electric proportional valve 7 is installed between the converter unit 1 and the main circulation pump 4, and adjusts the opening of the valve according to the temperature of the external environment to control the flow rate of the cooling medium flowing through the heat pump circulation unit 2.

As shown in fig. 4, the organic rankine cycle unit includes a high-pressure evaporator 301, an expansion screw 302, a condensed medium recoverer 303, and a power pump 304, and one end of the organic rankine cycle unit 3 is connected to the heat pump cycle unit 2. The high-pressure evaporator 301 is connected with an expansion screw machine 302, the expansion screw machine 302 is connected with a condensing medium recoverer 303, the condensing medium recoverer 303 is connected with a power pump 304, and the power pump 304 is connected with the high-pressure evaporator 301 to form closed-loop connection. The circulating water heated by the heat pump cycle unit 2 flows into the organic rankine cycle unit 3, the circulating water heated to 120 ℃ transfers heat to the evaporation circulating medium by the action of the high-pressure evaporator 301, and the cooled circulating water flows back to the heat pump condenser 203 for circulating flow. The evaporation circulating substance absorbing the heat is sent to the expansion screw machine 302 to do work, mechanical energy is converted into electric energy, the evaporation circulating substance releasing the energy flows to the condensing medium recoverer 303 to be recovered, and the evaporation circulating substance flows back to the high-pressure evaporator 301 to circularly flow under the driving of the power pump 304.

The organic Rankine cycle unit 3 is connected with the energy storage device 8 and the converter transformer fan 11, the electric quantity generated by the organic Rankine cycle unit 3 firstly meets the operation requirement of the circulation transformer fan 11, and the surplus electric quantity is stored in the energy storage device 8. The energy storage device 8 can output power supplies of 120V direct current, 220V alternating current and 380V alternating current, the electric quantity output by the energy storage device 8 can meet the operation requirements of power components in the main cycle 4, the deionization device 5, the nitrogen pressure stabilizing device 6 and the electric proportional valve 7, the operation requirements of an air conditioning system in the high-pressure converter valve 101 can be met, the electric quantity requirements of operation and maintenance personnel in the high-pressure circulating station for daily life and office work can be met, and the operation requirements of the power components in the heat pump cycle unit 2 and the organic Rankine cycle unit 3 can be met under the condition of more stored electric quantity.

The power generation device 9 comprises a wind power generation system and a photovoltaic power generation system, different combinations of the wind power generation system, the photovoltaic power generation system, the wind power generation system and the photovoltaic power generation system can be combined to adapt the power generation device according to the geographical environment and the position of the high-voltage converter station, the power generation device 9 is connected with an inverter device 12, and the electric quantity generated by the power generation device 9 drives the heat pump circulation unit 2 and the organic Rankine circulation unit 3 to operate through the inverter device 12.

In conclusion, the invention can obtain the following beneficial technical effects:

(1) the system provides the combination of the heat pump circulation unit and the organic Rankine circulation unit to recycle the heat of the cooling water discharged from the high-pressure converter valve, greatly reduces the energy waste and effectively improves the economic benefit of the extra-high voltage converter station.

(2) The circulating cooling medium is adopted to cool the extra-high voltage converter valve, the application of an original closed cooling tower and an air cooler is cancelled, and the waste of land resources and water resources is reduced.

(3) The matching design of the heat pump circulation unit, the organic Rankine circulation unit and the electric proportional valve ensures the constant temperature of the cooling medium of the high-pressure converter valve to the maximum extent, and improves the operation reliability of key components such as a thyristor, a damping resistor, a saturable reactor and the like.

(4) The novel low-carbon high-voltage converter station energy utilization system can dynamically coordinate the operation relation of each system according to environmental conditions, greatly reduce the emission of carbon dioxide of a high-voltage converter station, and realize low-carbon operation of an extra-high voltage converter station.

(5) The waste water flash distillation that this system adopted is handled, uses in extra-high voltage converter station field, reduces the waste of water resource.