CN213478412U - Liquid oxygen cold energy power generation system - Google Patents
Liquid oxygen cold energy power generation system Download PDFInfo
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- CN213478412U CN213478412U CN202022062480.8U CN202022062480U CN213478412U CN 213478412 U CN213478412 U CN 213478412U CN 202022062480 U CN202022062480 U CN 202022062480U CN 213478412 U CN213478412 U CN 213478412U
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Abstract
The utility model discloses a liquid oxygen cold energy power generation system, this liquid oxygen cold energy power generation system include rankine cycle power generation system and reheater. The Rankine cycle power generation system comprises a generator, and a preheater, an evaporator, a thermal power conversion machine, a condenser and a working medium pump which are sequentially connected into a loop. The heat-work power conversion machine is connected with the generator. The heat source inlet of the evaporator is used for receiving an external input heat source, and the heat source outlet is communicated with the heat source inlet of the preheater. The cold source inlet of the condenser is used for receiving liquid oxygen input from the outside. And a heat source inlet and a cold source inlet of the reheater are respectively communicated with a heat source outlet of the preheater and a cold source outlet of the condenser, so that the heat source output from the preheater and the cold source output from the condenser exchange heat in the reheater. The utility model discloses a closed thermodynamic cycle can practice thrift heat source consumption, effectively retrieves liquid oxygen cold energy, promotes the rational utilization of the energy, reduces the production energy consumption and the cost of steel industry.
Description
Technical Field
The utility model relates to an energy saving and emission reduction, cold energy power generation technical field.
Background
The steel industry is the largest industrial user of the oxygen industry, and the oxygen consumption in the steel production process accounts for about 70 percent of the total oxygen consumption. In order to ensure the stability of oxygen supply when the oxygen generating equipment fails and stops, steel enterprises usually build large-scale liquid oxygen storage tanks and liquid oxygen vaporization systems. Meanwhile, liquid oxygen is also taken as a gas supply peak regulation means to reduce the oxygen dispersion amount and the production energy consumption. At present, a water bath type vaporizer is a key device in a liquid oxygen vaporization gas supply system, and the water bath type vaporizer has the main function of transferring the heat of water vapor to low-temperature liquid oxygen through water so that the liquid oxygen absorbs heat, vaporizes into a gas state and reheats.
The water bath type liquid oxygen vaporizer is a heat exchanger, the traditional structure is shown in figure 1, the medium at the hot side of the water bath type vaporizer used for a liquid oxygen vaporization air supply system is water vapor, hot water or normal temperature water, and the medium at the cold side is liquid oxygen. Because the liquid oxygen temperature is low, the heat exchange between the water vapor, the hot water or the normal temperature water and the liquid oxygen is directly adopted, so that the heat energy at the hot side and the cold energy of the liquid oxygen at the cold side are greatly wasted.
In order to deepen structural reform of a supply side, effectively promote the manufacturing industry to reduce production cost and optimize stock resource allocation, a series of effective measures are taken in the steel industry in recent years, a plurality of steel enterprises select to expand the oxygen generation capacity of the enterprises, and a plurality of large oxygen generation units are invested and built. With the continuous development of the large-scale oxygen generator set matched with the steel industry, the demand of recovering cold and heat energy to generate electricity by reforming the water bath type vaporizer in the prior form is larger and larger.
At present, the research and application of cold energy recovery power generation at home and abroad mainly focuses on LNG (Liquefied Natural Gas), the research on energy conservation and consumption reduction related to liquid oxygen mainly focuses on the aspects of oxygen generation process, structural form improvement and optimization of a liquid oxygen vaporizer and the like, and the research and application of cold energy recovery power generation at home and abroad does not gain attention at home and abroad for the problem of liquid oxygen cold energy recovery power generation in the steel industry.
Disclosure of Invention
The utility model aims to solve the technical problem that the problem of not rational utilization of water bath formula liquid oxygen vaporizer energy in to steel industry provides an advantage liquid oxygen cold energy power generation system, and it can effectively retrieve liquid oxygen cold energy, promotes the rational utilization of the energy, reduces steel industry's production energy consumption and cost.
The embodiment of the utility model provides a liquid oxygen cold energy power generation system, including rankine cycle power generation system and reheater; the Rankine cycle power generation system comprises a generator, a preheater, an evaporator, a thermal power conversion machine, a condenser and a working medium pump; the preheater, the evaporator, the thermal power conversion machine, the condenser and the working medium pump are sequentially connected into a loop, and the thermal power conversion machine is connected with the generator to drive the generator to work; a heat source inlet of the evaporator is used for receiving an externally input heat source, and a heat source outlet of the evaporator is communicated with a heat source inlet of the preheater; a cold source inlet of the condenser is used for receiving externally input liquid oxygen; and a heat source inlet and a cold source inlet of the reheater are respectively communicated with a heat source outlet of the preheater and a cold source outlet of the condenser, so that the heat source output from the preheater and the cold source output from the condenser exchange heat in the reheater.
The utility model discloses at least, have following advantage:
the utility model discloses a liquid oxygen cold energy power generation system has adopted closed thermodynamic cycle, has practiced thrift heat source consumption, has retrieved liquid oxygen cold energy effectively, has promoted the rational utilization of the energy, and whole equipment size is little simultaneously, and sealing system's the design degree of difficulty reduces, and investment cost is low.
Drawings
Fig. 1 shows a schematic diagram of a water bath type liquid oxygen vaporizer.
Fig. 2 shows a schematic diagram of a liquid oxygen-cooled power generation system according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram of a liquid oxygen cold energy power generation system applied to a water bath type liquid oxygen vaporizer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, but the present invention is not limited thereto.
Fig. 2 shows a schematic diagram of a liquid oxygen cooled power generation system according to an embodiment of the present invention. As shown in fig. 3, the liquid oxygen cooling power generation system according to an embodiment of the present invention includes a preheater 1, an evaporator 2, a thermal power conversion machine 3, a generator 4, a condenser 5, a working medium pump 6, and a reheater 7. The preheater 1, the evaporator 2, the thermal power conversion machine 3, the condenser 5 and the working medium pump 6 are connected in sequence to form a loop. The thermal power conversion machine 3 is connected with the generator 4 to drive the generator 4 to work.
A heat source inlet of the evaporator 2 is used for receiving an externally input heat source, and a heat source outlet of the evaporator 2 is communicated with a heat source inlet of the preheater 1; the cold source inlet of the condenser 5 is used for receiving liquid oxygen input from the outside.
The heat source inlet and the cold source inlet of the reheater 7 are respectively communicated with the heat source outlet of the preheater 1 and the cold source outlet of the condenser 5, so that the heat source output from the preheater 1 and the cold source output from the condenser 5 exchange heat in the reheater.
The Rankine cycle power generation system of the embodiment uses carbon dioxide as a cycle working medium, and the carbon dioxide circulates in a loop formed by sequentially connecting a preheater 1, an evaporator 2, an expander 3, a condenser 5 and a working medium pump 6, so that liquid oxygen cooling energy power generation is realized. Specifically, firstly, liquid carbon dioxide (the pressure of the liquid carbon dioxide input into the preheater 1 is 1.0 Mpa-6.0 Mpa, and the temperature is-81 ℃ to-54 ℃) exchanges heat with a heat source (such as water vapor, hot water and normal temperature water) in the preheater 1 and the evaporator 2 in sequence, absorbs the heat of the heat source, and then is vaporized. Then, gaseous carbon dioxide (the pressure is 1.0-6.0 Mpa, the temperature is-35-26 ℃) enters the thermal power conversion machine 3 to do work, the thermal energy is converted into mechanical work, and the mechanical work drives the generator 4 to be converted into electric energy to be output. Carbon dioxide gas (with pressure of 0.2 Mpa-0.6 Mpa and temperature of-76 deg.C to-53 deg.C) output from the thermal power conversion machine 3 enters the condenser 5 and is condensed into liquid state (with pressure of 0.2 Mpa-0.6 Mpa and temperature of-82 deg.C to-57 deg.C) by low-temperature liquid oxygen. Then, the liquid carbon dioxide is delivered to the preheater 1 through the working medium pump 6, so that a closed working cycle of the carbon dioxide is formed.
The heat source output from the preheater 1 exchanges heat with the gaseous low-temperature oxygen output from the condenser 5 in the recuperator 7, and the heated oxygen and the cooled heat source flow out of the recuperator 7.
The rankine cycle power generation system of the present embodiment uses normal-temperature water, hot water, or steam as a heat source. The heat source (with the temperature range of 10-30 ℃) enters from a heat source inlet of the evaporator 2, exchanges heat with carbon dioxide working medium in the evaporator 2 and the preheater 1 in sequence, and enters from a heat source outlet of the preheater 1 (with the temperature range of 6-23.5 ℃) into a heat source inlet of the reheater 7.
The Rankine cycle power generation system of the embodiment takes liquid oxygen (with the temperature range of-164 ℃ to-183 ℃) as a cold source. Liquid oxygen enters from a cold source inlet of the condenser 5, and becomes gaseous low-temperature oxygen (the temperature range is minus 90 ℃ to minus 122 ℃) after heat exchange with a carbon dioxide working medium in the condenser 5. The gaseous low-temperature oxygen enters a cold source inlet of the reheater 7, exchanges heat with a heat source from the preheater 1 in the reheater 7, and is heated to the temperature required by the process.
Alternatively, the thermal power conversion machine 3 is an expander.
Compared with the conventional Organic Rankine Cycle (ORC) technology, the beneficial effects of the embodiment are as follows:
1. the selected circulating working medium carbon dioxide is a natural working medium and has the following advantages: the environment-friendly type water-based paint is non-toxic and harmless to human bodies and has no pollution to the environment, and belongs to a green environment-friendly type medium; the physical and chemical properties are stable, and the paint is non-combustible, non-explosive, non-decomposed, non-corrosive and non-explosive; easy to obtain, low in price and low in investment cost;
2. the carbon dioxide system has high operation pressure, the heat exchanger and the pipeline accessories have small sizes, and the whole equipment has small size, light weight and small occupied area;
3. the carbon dioxide is selected as a working medium, the design difficulty of a main machine sealing system is reduced, a sealing leakage gas treatment system and corresponding security measures are simplified, the overall air tightness of the system, leakage monitoring and corresponding emergency treatment measure grades are reduced, the flow of a power generation system is simple, and the operability of a control system is strong;
4. the carbon dioxide Rankine cycle system with the reheater 7 is suitable for heat sources with various temperature levels such as normal-temperature water, hot water, steam and the like, and the water flowing out of the preheater 1 and the oxygen flowing out of the condenser 5 exchange heat in the reheater 7, so that the water temperature can be reduced to about 20 ℃ and the water can be used as cooling water for other processes in a factory. The oxygen is heated to about 15 ℃ after passing through the reheater 7, and can be directly used by devices such as a converter and the like;
5. the utility model discloses process systems neither influences upper and lower reaches production technology, also additionally consumes energy, through heat source energy and the recycle of liquid oxygen cold energy, additionally provides a quantitative electric energy for the enterprise.
The power generation operation of the liquid oxygen cooled power generation system according to this embodiment will be described in detail with reference to a specific embodiment.
In this embodiment, normal-temperature water (30 ℃) is used as a heat source (hot water or steam is also suitable as a heat source), liquid oxygen (-183 ℃) is used as a cold source, and an expander is used as the thermal power conversion machine 3.
Liquid carbon dioxide at 4MPa and-54 ℃ exchanges heat with heat source normal temperature water (30 ℃) in the preheater 1 and the evaporator 2 in sequence, the water temperature reaches about 23 ℃, and the carbon dioxide absorbs the heat of the water and then is vaporized; gaseous carbon dioxide with the pressure of 3.97MPa and the temperature of 9 ℃ enters the expander 3 to be expanded and do work, the heat energy is converted into mechanical work, and finally the generator 4 is driven to be converted into electric energy to be output; the expanded carbon dioxide gas (0.6 MPa and 53 ℃) enters a condenser 5 to exchange heat with low-temperature liquid oxygen (3.1 MPa and 183 ℃) and is condensed into liquid (0.57 MPa and 57 ℃); the liquid carbon dioxide is then conveyed to the preheater 1 by means of the working medium pump 6, so that a closed working cycle of the carbon dioxide is formed. The water (23 ℃) from the preheater 1 exchanges heat with the gaseous low temperature oxygen (-122 ℃) from the condenser 5 in the recuperator 7, heating the oxygen to about 15 ℃ for the process, and the heat source finally exits the recuperator 7 as water at about 20 ℃.
Utilize the utility model discloses liquid oxygen cold energy power generation system can realize the transformation to current water bath formula liquid oxygen vaporizer, is about to this liquid oxygen cold energy power generation system and adds as closed thermodynamic cycle between hot side medium and cold side liquid oxygen, as shown in fig. 3, utilizes the huge difference in temperature of both sides medium, retrieves the electricity generation with the energy of cold, hot both sides medium simultaneously.
The foregoing description is provided to further illustrate the present invention in connection with the detailed description and the accompanying drawings. However, it is obvious that the present invention can be implemented in various other ways than those described herein, and those skilled in the art can make popularization and deduction according to actual use without departing from the content of the present invention, and therefore, the content of the above specific embodiments should not limit the scope of protection determined by the present invention.
Claims (4)
1. The liquid oxygen cold energy power generation system is characterized by comprising a Rankine cycle power generation system and a reheater;
the Rankine cycle power generation system comprises a generator, a preheater, an evaporator, a thermal power conversion machine, a condenser and a working medium pump; the preheater, the evaporator, the thermal power conversion machine, the condenser and the working medium pump are sequentially connected into a loop, and the thermal power conversion machine is connected with the generator to drive the generator to work; the heat source inlet of the evaporator is used for receiving an externally input heat source, and the heat source outlet of the evaporator is communicated with the heat source inlet of the preheater; a cold source inlet of the condenser is used for receiving externally input liquid oxygen;
and a heat source inlet and a cold source inlet of the reheater are respectively communicated with a heat source outlet of the preheater and a cold source outlet of the condenser, so that the heat source output from the preheater and the cold source output from the condenser exchange heat in the reheater.
2. The liquid oxygen cooled power generation system of claim 1, wherein the rankine cycle power generation system uses carbon dioxide as a circulating working medium.
3. The liquid oxygen cooled power generation system of claim 1, wherein the rankine cycle power generation system uses normal temperature water, hot water or steam as a heat source.
4. The hydrooxygen-cooled power generation system of claim 1, wherein the thermal-power conversion machine is an expander.
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| CN202022062480.8U CN213478412U (en) | 2020-09-19 | 2020-09-19 | Liquid oxygen cold energy power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112112697A (en) * | 2020-09-19 | 2020-12-22 | 中国船舶重工集团公司第七一一研究所 | Liquid oxygen cold energy power generation system and power generation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112697A (en) * | 2020-09-19 | 2020-12-22 | 中国船舶重工集团公司第七一一研究所 | Liquid oxygen cold energy power generation system and power generation method |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Patentee after: SHANGHAI QIYAO SCREW MACHINERY Co.,Ltd. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute Patentee before: SHANGHAI QIYAO SCREW MACHINERY Co.,Ltd. |