CN105221194B - Liquid nitrogen auxiliary waste heat recovery energy storage power generation system - Google Patents
Liquid nitrogen auxiliary waste heat recovery energy storage power generation system Download PDFInfo
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- CN105221194B CN105221194B CN201510744277.XA CN201510744277A CN105221194B CN 105221194 B CN105221194 B CN 105221194B CN 201510744277 A CN201510744277 A CN 201510744277A CN 105221194 B CN105221194 B CN 105221194B
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Abstract
A liquid nitrogen auxiliary waste heat recovery energy storage power generation system comprises a waste gas pipeline, an expander, a condenser, a heat exchanger, a compressor, an expansion valve, a water pump, a low-temperature heat storage tank, a high-temperature heat storage tank, a power generator, a temperature difference engine and a liquid nitrogen storage tank. The compressor, the condenser, the expansion valve and the expander are connected into a heat absorption loop through pipelines. The low-temperature heat storage tank, the water pump, the heat exchanger and the high-temperature heat storage tank form a heat storage link in a heat storage/release cycle. The low-temperature heat storage tank, the high-temperature heat storage tank, the generator, the temperature difference engine and the liquid nitrogen storage tank form a liquid nitrogen-cooled energy storage power station. The invention can store the industrial waste heat, convert the industrial waste heat into electric power output at the time with the highest use value, and efficiently and high-value utilize the industrial waste heat in an electric power mode.
Description
Technical Field
The invention relates to the technical field of industrial waste heat recovery, also relates to the technical field of power generation, and also relates to a waste heat recovery energy storage device (see patent application number 201510584920.7).
Background
At present, the utilization of industrial waste heat generally directly utilizes heat energy, and converts the heat energy into power or electric power for output. The energy recovered by these methods must be immediately used and cannot be stored, and if it happens to be in a time period that is relatively short for the energy, it is meaningless to recover this energy. In addition, the existing waste heat recovery power generation technology is limited by the carnot cycle efficiency law, the efficiency is low, and generally, only 10% to 15% of waste heat energy can be recovered. Therefore, the commercial value of waste heat recovery and utilization is not high, and the popularization of the energy-saving technology of waste heat recovery and power generation is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid nitrogen auxiliary waste heat recovery energy storage power generation system. The technical scheme of the invention is as follows: a liquid nitrogen auxiliary waste heat recovery energy storage power generation system comprises an expander, a condenser, a heat exchanger, a compressor, an expansion valve, a water pump, a low-temperature heat storage tank, a high-temperature heat storage tank, a power generator, a temperature difference engine and a liquid nitrogen storage tank.
The compressor, the condenser, the expansion valve and the expander are connected into a heat absorption loop through pipelines.
The heat absorption loop contains gas working medium, and the gas working medium circularly flows among the compressor, the condenser, the expansion valve and the expander along the pipeline under the driving of the compressor, so that the heat energy absorbed from the waste gas pipeline is transferred to the heat exchanger to be released.
The low-temperature heat storage tank, the water pump, the heat exchanger and the high-temperature heat storage tank form a heat storage link in a heat storage/release cycle.
In the heat storage link, the used heat transfer working medium is a liquid working medium, absorbs heat in the heat exchanger under the driving of the water pump, and then flows to the high-temperature heat storage tank for storage.
The low-temperature heat storage tank, the high-temperature heat storage tank, the generator, the temperature difference engine and the liquid nitrogen storage tank form a liquid nitrogen-cooled energy storage power station which is a heat release acting link in heat storage/heat release circulation.
When the liquid nitrogen-cooled energy storage power station works, the used working medium is heat conduction oil and is used for providing heat energy for the temperature difference engine, and the flow direction of the working medium flows out of the high-temperature heat storage tank, flows through the heater of the temperature difference engine and enters the low-temperature heat storage tank.
When the energy storage power station cooled by the liquid nitrogen works, the liquid nitrogen flows out of the liquid nitrogen storage tank, is cooled and gasified by a cooler of the temperature difference engine, and is finally discharged in a waste gas form through a chimney.
When the liquid nitrogen-cooled energy storage power station works, the temperature difference engine drives the motor to generate electric power to be output, and the electric power is uniformly transmitted to a power grid through the power distribution room.
An adjusting valve is arranged between the liquid nitrogen storage tank and a cooler of the temperature difference engine and is controlled by an ECU in the temperature difference engine, and the temperature difference engine adjusts the output power of the temperature difference engine by adjusting the flow of the liquid nitrogen.
The invention has the advantages of
The liquid nitrogen auxiliary waste heat recovery energy storage power generation system provided by the invention can be used for recovering industrial waste heat and then storing the industrial waste heat in a high-temperature heat energy mode, and when high energy requirements are met, a temperature difference engine is used as a core, the temperature difference between a high-temperature working medium stored in a high-temperature heat storage tank and liquid nitrogen in a liquid nitrogen storage tank is converted into power, and then the power is converted into electric power to be output. As the temperature of the liquid nitrogen is as low as 196 ℃ below zero, the Carnot cycle efficiency of the industrial waste heat utilization can be greatly improved according to the Carnot cycle efficiency law. The invention opens up a new technical path for the utilization of industrial waste heat, can be widely applied to high-energy-consumption industries, can make contributions to energy conservation, emission reduction and environmental protection, and provides a solid foundation for the development of green industrial civilization.
Drawings
FIG. 1 is a schematic diagram of a system of the heat recovery energy storage device;
in the figure, 1, an exhaust gas channel, 2, an expansion valve, 3, a compressor, 4, a heat exchanger, 5, a condenser, 6, a high-temperature heat storage tank, 7, a chimney, 8, a liquid nitrogen storage tank, 9, a cooler of a temperature difference engine, 10, a power grid, 11, a power distribution station, 12, an engine, 13, a temperature difference engine cylinder body, 14, a heater of the temperature difference engine, 15, a low-temperature heat storage tank, 16, a water pump, 17 and an expander are arranged in sequence.
Detailed description of the preferred embodiments
The first embodiment is as follows: referring to fig. 1, a liquid nitrogen assisted waste heat recovery energy storage power generation system includes an expander, a condenser, a heat exchanger, a compressor, an expansion valve, a water pump, a low temperature heat storage tank, a high temperature heat storage tank, a generator, a temperature difference engine, and a liquid nitrogen storage tank.
The compressor, the condenser, the expansion valve and the expander are connected into a heat absorption loop through pipelines.
The heat absorption loop contains gas working medium, and the gas working medium circularly flows among the compressor, the condenser, the expansion valve and the expander along the pipeline under the driving of the compressor, so that the heat energy absorbed from the waste gas pipeline is transferred to the heat exchanger to be released.
The low-temperature heat storage tank, the water pump, the heat exchanger and the high-temperature heat storage tank form a heat storage link in a heat storage/release cycle.
In the heat storage link, the used heat transfer working medium is a liquid working medium, absorbs heat in the heat exchanger under the driving of the water pump, and then flows to the high-temperature heat storage tank for storage.
The low-temperature heat storage tank, the high-temperature heat storage tank, the generator, the temperature difference engine and the liquid nitrogen storage tank form a liquid nitrogen-cooled energy storage power station which is a heat release acting link in heat storage/heat release circulation.
When the liquid nitrogen-cooled energy storage power station works, the used working medium is heat conduction oil and is used for providing heat energy for the temperature difference engine, and the flow direction of the working medium flows out of the high-temperature heat storage tank, flows through the heater of the temperature difference engine and enters the low-temperature heat storage tank.
When the energy storage power station cooled by the liquid nitrogen works, the liquid nitrogen flows out of the liquid nitrogen storage tank, is cooled and gasified by a cooler of the temperature difference engine, and is finally discharged in a waste gas form through a chimney.
When the liquid nitrogen-cooled energy storage power station works, the temperature difference engine drives the motor to generate electric power to be output, and the electric power is uniformly transmitted to a power grid through the power distribution room.
An adjusting valve is arranged between the liquid nitrogen storage tank and a cooler of the temperature difference engine and is controlled by an ECU in the temperature difference engine, and the temperature difference engine adjusts the output power of the temperature difference engine by adjusting the flow of the liquid nitrogen.
The invention provides a new technical scheme for utilizing waste heat, according to the scheme, industrial waste heat can be recovered and stored, and then when energy is needed most, a temperature difference engine is utilized to convert heat storage into electric power for output. Meanwhile, the liquid nitrogen is used for cooling the cooler of the temperature difference engine, so that the Carnot cycle efficiency is improved. The scheme can improve the efficiency of waste heat utilization and has more stable power output.
This scheme includes expander, condenser, heat exchanger, compressor, expansion valve, water pump, low temperature heat storage jar, high temperature heat storage jar, generator, difference in temperature engine, liquid nitrogen holding vessel.
The whole system consists of three parts of heat absorption, heat storage and power generation.
The heat absorption loop consists of a compressor, a condenser, an expansion valve and an expander, and the four components are connected into a whole through pipelines to form the heat absorption loop. The heat source is industrial waste gas from the waste gas pipeline, the industrial waste gas circularly flows among the compressor, the condenser, the expansion valve and the expander along the pipeline under the driving of the compressor through an internal gas working medium, and heat energy absorbed from the waste gas pipeline is transferred to the heat exchanger to be released.
The low-temperature heat storage tank, the water pump, the heat exchanger and the high-temperature heat storage tank form a heat storage link in a heat storage/release cycle. In the heat storage link, the heat transfer working medium is a liquid working medium. Under the drive of the water pump, the liquid working medium flows out of the low-temperature heat storage tank, absorbs heat through the heat exchanger, and then flows to the high-temperature heat storage tank for storage.
The power generation link is composed of a low-temperature heat storage tank, a high-temperature heat storage tank, a power generator, a temperature difference engine and a liquid nitrogen storage tank. The power generation link is a liquid nitrogen cooled energy storage power station, and forms a heat release acting link in a heat storage/heat release cycle.
When the liquid nitrogen-cooled energy storage power station works, the liquid working medium from the high-temperature heat storage tank is used for providing heat energy for the temperature difference engine, the flow direction of the liquid working medium flows out of the high-temperature heat storage tank, flows through a heater of the temperature difference engine, releases the heat energy, is cooled, and then flows back to the low-temperature heat storage tank. Meanwhile, liquid nitrogen flows out of the liquid nitrogen storage tank, is cooled and gasified by a cooler of the temperature difference engine, and is finally discharged in a waste gas form through a chimney.
Liquid nitrogen is used to improve the carnot cycle efficiency of a thermoelectric engine. Since liquid nitrogen can be produced using an air separation plant at the time of a power utilization valley at night, liquid nitrogen can be regarded as energy storage for abundant power. Meanwhile, since the production of liquid nitrogen does not increase additional fuel efficiency, the carbon emission amount of liquid nitrogen can be considered to be zero.
When the liquid nitrogen-cooled energy storage power station works, the temperature difference engine generates power by using the temperature difference between the high temperature of the heat energy from the high-temperature heat storage tank and the low temperature of the liquid nitrogen, drives the motor to generate electric power to be output, and finally transmits the electric power to a power grid in a unified mode through the power distribution room.
An adjusting valve is arranged between a liquid nitrogen storage tank and a cooler of the temperature difference engine and is controlled by an ECU (electronic control unit) in the temperature difference engine, and the temperature difference engine adjusts the output power of the temperature difference engine by adjusting the flow of liquid nitrogen; when the flow of the liquid nitrogen is small, the output power of the temperature difference engine is also small. Therefore, the output power of the whole system can be accurately adjusted by adjusting the using amount of the liquid nitrogen, so that stable and efficient power supply is realized.
Claims (6)
1. A liquid nitrogen auxiliary waste heat recovery energy storage power generation system comprises an expander, a condenser, a heat exchanger, a compressor, an expansion valve, a water pump, a low-temperature heat storage tank, a high-temperature heat storage tank, a generator, a temperature difference engine and a liquid nitrogen storage tank;
the compressor, the condenser, the expansion valve and the expander are connected into a heat absorption loop through pipelines; the heat absorption loop contains gas working medium, and the gas working medium circularly flows among the compressor, the condenser, the expansion valve and the expander along the pipeline under the driving of the compressor, so that the heat energy absorbed from the waste gas pipeline is transferred to the heat exchanger to be released;
the low-temperature heat storage tank, the water pump, the heat exchanger and the high-temperature heat storage tank form a heat storage link in a heat storage/release cycle; in the heat storage link, the used heat transfer working medium is a liquid working medium, absorbs heat in the heat exchanger under the driving of the water pump, and then flows to the high-temperature heat storage tank for storage.
2. The liquid nitrogen assisted waste heat recovery energy storage power generation system of claim 1, wherein: the low-temperature heat storage tank, the high-temperature heat storage tank, the generator, the temperature difference engine and the liquid nitrogen storage tank form a liquid nitrogen-cooled energy storage power station which is a heat release acting link in heat storage/heat release circulation.
3. The liquid nitrogen assisted waste heat recovery energy storage power generation system of claim 2, wherein: when the liquid nitrogen-cooled energy storage power station works, the used working medium is heat conduction oil and is used for providing heat energy for the temperature difference engine, and the flow direction of the working medium flows out of the high-temperature heat storage tank, flows through the heater of the temperature difference engine and enters the low-temperature heat storage tank.
4. The liquid nitrogen assisted waste heat recovery energy storage and power generation system of claim 3, wherein: when the energy storage power station cooled by the liquid nitrogen works, the liquid nitrogen flows out of the liquid nitrogen storage tank, is cooled and gasified by a cooler of the temperature difference engine, and is finally discharged in a waste gas form through a chimney.
5. The liquid nitrogen assisted waste heat recovery energy storage power generation system of claim 4, wherein: when the liquid nitrogen-cooled energy storage power station works, the temperature difference engine drives the motor to generate electric power to be output, and the electric power is uniformly transmitted to a power grid through the power distribution room.
6. The liquid nitrogen assisted waste heat recovery energy storage and power generation system of claim 5, wherein: an adjusting valve is arranged between the liquid nitrogen storage tank and a cooler of the temperature difference engine and is controlled by an ECU in the temperature difference engine, and the temperature difference engine adjusts the output power of the temperature difference engine by adjusting the flow of the liquid nitrogen.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202133185U (en) * | 2011-06-01 | 2012-02-01 | 西安交通大学 | High-temperature steam-generating heat pump system |
| CN103423916A (en) * | 2013-08-06 | 2013-12-04 | 柳州职业技术学院 | Low-grade heat energy recycling device |
| CN104075489A (en) * | 2014-07-19 | 2014-10-01 | 烟台明辉热泵节能科技有限公司 | High-temperature steam heat pump unit |
| CN104832387A (en) * | 2015-03-25 | 2015-08-12 | 上海领势新能源科技有限公司 | Liquid-nitrogen assisted energy storage tower type solar power plant |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202133185U (en) * | 2011-06-01 | 2012-02-01 | 西安交通大学 | High-temperature steam-generating heat pump system |
| CN103423916A (en) * | 2013-08-06 | 2013-12-04 | 柳州职业技术学院 | Low-grade heat energy recycling device |
| CN104075489A (en) * | 2014-07-19 | 2014-10-01 | 烟台明辉热泵节能科技有限公司 | High-temperature steam heat pump unit |
| CN104832387A (en) * | 2015-03-25 | 2015-08-12 | 上海领势新能源科技有限公司 | Liquid-nitrogen assisted energy storage tower type solar power plant |
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