CN210829421U - Supercritical carbon dioxide power generation system combining supercritical water oxidation technology - Google Patents
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Abstract
The utility model relates to a supercritical carbon dioxide power generation system combining supercritical water oxidation technology, which comprises a supercritical water oxidation unit, a heat exchange unit, a supercritical carbon dioxide power generation unit, an expander power generation unit and a tail gas heat energy utilization and recovery unit; the supercritical water oxidation unit comprises a supercritical water oxidation reactor, the heat exchange unit comprises a main heat exchanger, the supercritical carbon dioxide power generation unit comprises a turbine, a motor, a high-temperature heat exchanger, a low-temperature heat exchanger, a high-temperature compressor, a low-temperature compressor and a cooler, and the expander power generation unit comprises an expander and a generator; the tail gas heat energy utilization and recovery unit comprises a liquefaction separation treatment device. The utility model relates to a supercritical carbon dioxide power generation system combined with supercritical water oxidation technology, which can effectively treat sewage and sludge and simultaneously generate electric energy; and an ecological development mode combining environmental pollution treatment and energy development and utilization is realized.
Description
Technical Field
The utility model belongs to the technical field of clean energy power generation system, especially a supercritical carbon dioxide power generation system who unites supercritical water oxidation technology.
Background
With the increasing severity of the problems of energy shortage and environmental pollution, the traditional economic growth mode with high energy consumption and high pollution is changed, low-carbon economy is developed, sustainable development is realized, and the method is becoming a common choice for economic development of all countries in the world.
The development and utilization of clean, environment-friendly, renewable and ecologically recycling-beneficial new energy is the key to the relief of energy and environmental problems for mankind. While electric power consumption is one of the main forms of energy consumption, about 68% of other various energy sources are converted into electric power consumption. Therefore, it is of great significance to develop new energy and convert it into electrical energy for storage and utilization.
At present, as a main new energy source, solar thermal power generation firstly converts solar energy into heat energy and then converts the heat energy into electric energy, and the solar thermal power generation has two conversion modes. One is to directly convert solar heat energy into electric energy, such as thermoelectric power generation of semiconductors or metal materials, thermoelectronic and thermionic power generation in vacuum devices, alkali metal thermoelectric conversion, magnetohydrodynamic power generation, and the like. Another way is to use solar thermal energy to drive a generator to generate electricity through a heat engine (e.g., a steam turbine), similar to conventional thermal power generation, except that the thermal energy comes not from fuel, but from solar energy.
Geothermal power generation is a power generation technology using underground hot water and steam as power sources. The geothermal energy is first converted into mechanical energy, and then the mechanical energy is converted into electric energy. Geothermal energy is generally classified into low-temperature geothermal energy (60 to 100 ℃), medium-temperature geothermal energy (100 to 150 ℃) and high-temperature geothermal energy (150 ℃ or higher). Geothermal heat is a low grade energy source since it is typically less than 250 ℃. Geothermal power generation typically requires the combined generation of electricity with other heat sources in order to increase efficiency.
However, power generation technologies such as solar thermal power generation and geothermal power generation are not suitable for all cities due to the cost of light collection and uneven distribution of geothermal heat. And the development of new energy is not combined with environmental pollution treatment, so that the construction and management cost of the city is easily increased.
Along with the development of social life and economic activities, urban population is continuously increased, urban scale is rapidly enlarged, and urban sewage and sludge become a big problem troubling human beings. How to effectively treat the urban sewage and sludge and simultaneously generate electric energy, form low-carbon economy marked by low energy consumption and low emission, realize sustainable development combining environmental management and energy development, and is an important problem which needs to be solved in urban economy development.
Chinese patent (named: supercritical carbon dioxide power generation system patent number: CN201510666417.6 based on secondary reflection light-gathering heat absorption technology) discloses a technical scheme for generating power by utilizing solar heat. The solar energy-saving heat-storage heat-exchange system comprises a solar light-gathering system, a heat-absorption energy-storage heat-exchange system and a power generation system.
Chinese patent (titled: a geothermal, gas and supercritical carbon dioxide combined power generation system, patent No. CN201510132018.1) discloses a power generation technology using geothermal and gas. According to the technical scheme, the method comprises the steps of collecting and utilizing geothermal heat, combining the geothermal heat with other energy sources to act as a heat exchange system, and finally, providing a power generation system.
Solar thermal power generation requires not only a solar concentrating system but also a thermal power generation system, and requires heating water from an ambient state to a superheated steam state. Therefore, the solar power generation has the problems of high cost and low conversion efficiency. The geothermal power generation needs other fuels as auxiliary heat sources, such as combined power generation with gas, and has the disadvantages of complex system structure, high maintenance difficulty and high power generation cost. It can be seen that most of the existing energy solutions only consider the development and utilization of new energy to reduce environmental pollution, but do not consider solutions to the problem of environmental pollution already caused. Or only the solution of environmental pollution is considered without mentioning the energy problem. The repeated construction and high investment become phase-changing environmental burden and energy waste.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a supercritical carbon dioxide power generation system who combines supercritical water oxidation technology, produce the electric energy in the time of can effective treatment sewage mud, realize environmental pollution administers the ecotype development mode that combines together with energy development and utilization.
The utility model also aims to provide a power generation method of supercritical carbon dioxide power generation system of combination supercritical water oxidation technique.
The utility model provides a its technical problem realize through following technical scheme:
the utility model provides a supercritical carbon dioxide power generation system who combines supercritical water oxidation technique which characterized in that: the system comprises a supercritical water oxidation unit, a heat exchange unit, a supercritical carbon dioxide power generation unit, an expander power generation unit and a tail gas heat energy utilization and recovery unit; the supercritical water oxidation unit comprises a supercritical water oxidation reactor, the heat exchange unit comprises a main heat exchanger, the supercritical carbon dioxide power generation unit comprises a turbine, a motor, a high-temperature heat exchanger, a low-temperature heat exchanger, a high-temperature compressor, a low-temperature compressor and a cooler, and the expander power generation unit comprises an expander and a generator; the tail gas heat energy utilization and recovery unit comprises a liquefaction separation treatment device; a high-temperature flue gas outlet of the supercritical water oxidation reactor is connected to a heat medium inlet of a main heat exchanger, a heat medium outlet of the main heat exchanger is connected to a gas inlet of an expander, a power generation working medium outlet of the main heat exchanger is connected to a turbine, a turbine driving motor, a power generation working medium outlet of the turbine is sequentially connected with a high-temperature heat exchanger and a low-temperature heat exchanger, a part of power generation working medium outlet of the low-temperature heat exchanger is connected with heat exchange inlets of the low-temperature heat exchanger and the high-temperature heat exchanger sequentially after passing through a cooler and a low-temperature compressor, a part of power generation working medium outlet of the low-temperature heat exchanger is connected back to a heat; the low-temperature steam outlet of the expansion machine is connected to the liquefaction separation processing device.
And, supercritical carbon dioxide power generation unit includes first turbine, second motor, main heat exchanger's the power generation working medium export is connected to the power generation working medium entry of first turbine, second turbine respectively, and first turbine drive first motor (6), second turbine drive second motor, and the power generation working medium export of first turbine, second turbine all connects gradually high temperature heat exchanger and low temperature heat exchanger.
Moreover, the working medium of the supercritical carbon dioxide power generation unit is supercritical carbon dioxide.
The utility model discloses an advantage and beneficial effect do:
1. the utility model discloses a supercritical carbon dioxide power generation system of combined supercritical water oxidation technology, the heat energy that the supercritical water oxidation treatment process produced is as the heat source, and this heat source passes through heat exchange unit, transmits the energy to the working medium-supercritical carbon dioxide of supercritical carbon dioxide power generation unit; the heated supercritical carbon dioxide drives the power generation unit to generate power, the heat energy generated by supercritical water oxidation is only partially transferred to the supercritical carbon dioxide power generation unit, the rest heat energy enters the energy step utilization part, namely the expander power generation unit, and is further converted into electric energy, the low-temperature steam in the tail gas of the expander power generation unit can be used as heat supply, and the rest tail gas is liquefied and separated to obtain gas fertilizer, so that the energy recovery and utilization are greatly improved.
2. The utility model discloses combine supercritical water oxidation technology's supercritical carbon dioxide power generation system, supercritical water oxidation technology can realize carrying out degree of depth oxidation treatment's technique to multiple organic waste to supercritical water is the reaction medium, through the oxidation reaction of homogeneous phase, turns into clear CO with the organic matter completely2、H2O、N2And other harmless micromolecules, before the oxidation treatment, the supercritical state of water is firstly ensured, namely the temperature is above 374 ℃ and the pressure is above 22.1MPa, after the oxidation reaction is normally carried out, the temperature and the pressure in the supercritical water oxidation reactor can reach about 650-1000 ℃, the pressure is about 25-35 MPa, and the supercritical water oxidation technology is adopted for treatmentMunicipal waste water and mud, this processing procedure produce a large amount of heat energy, with a large amount of heat energy that supercritical water oxidation process produced, turn into the electric energy with a large amount of heat energy that supercritical water oxidation process produced, realize the environmental pollution and administer the ecotype development mode that combines together with energy development and utilization.
3. The utility model discloses combine supercritical carbon dioxide power generation system of supercritical water oxidation technique, supercritical carbon dioxide refers to the thermodynamic state on being in the critical point, temperature T is more than or equal to 31 ℃, pressure P is more than or equal to 74 atmospheric pressure's state, supercritical carbon dioxide is in the single phase state between liquid and gas, unique physicochemical property has, its viscosity is close to gas, density is close to liquid, the diffusion coefficient is between gas and liquid, so its characteristics that have gas and liquid concurrently, not only like gas easy diffusion, there is very strong dissolving capacity like liquid again, therefore supercritical carbon dioxide has high diffusivity and high solubility.
4. The utility model discloses combine supercritical carbon dioxide power generation system of supercritical water oxidation technique, supercritical carbon dioxide is as power generation system's cycle working medium and heat transfer fluid for the energy conversion process of heat energy conversion electric energy, because its density is high, the circulation is simple, so generating set light in weight, the size is little, and its brayton cycle efficiency is higher than other working mediums under the lower condition of temperature, makes it possible to convert well low temperature heat energy resource to the electric energy.
5. The utility model discloses a supercritical carbon dioxide power generation system of combined supercritical water oxidation technology is used for solving the problems of environmental pollution and energy shortage in urban development, and can also be used for a distributed power generation system, and the scheme can effectively process sewage and sludge and simultaneously generate electric energy; and an ecological development mode combining environmental pollution treatment and energy development and utilization is realized.
Drawings
FIG. 1 is a schematic view of the process flow of the present invention;
fig. 2 is a schematic diagram of energy transfer and conversion according to the present invention.
Fig. 3 is a schematic diagram of the supercritical water oxidation unit of the present invention.
Description of reference numerals:
i-supercritical water oxidation unit, II-heat exchange unit, III-supercritical carbon dioxide power generation unit, IV-expander power generation unit and V-tail gas heat energy utilization and recovery unit;
1-supercritical water oxidation reactor, 2-main heat exchanger, 3-first turbine, 4-second turbine, 5-second motor, 6-first motor, 7-high temperature heat exchanger, 8-low temperature heat exchanger, 9-high temperature compressor, 10-cooler, 11-low temperature compressor, 12-expander, 13-generator, 14-liquefaction separation treatment device.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
A supercritical carbon dioxide power generation system combining supercritical water oxidation technology, as shown in fig. 1, comprising a supercritical water oxidation unit (I), a heat exchange unit (II), a supercritical carbon dioxide power generation unit (III), an expander power generation unit (IV) and a tail gas heat energy utilization and recovery unit (V); the supercritical water oxidation unit (I) comprises a supercritical water oxidation reactor (1), the heat exchange unit (II) comprises a main heat exchanger (2), the supercritical carbon dioxide power generation unit (III) comprises a turbine, a motor, a high-temperature heat exchanger (7), a low-temperature heat exchanger (8), a high-temperature compressor (9), a low-temperature compressor (11) and a cooler (10), and the expander power generation unit (IV) comprises an expander (12) and a generator (13); the tail gas heat energy utilization and recovery unit (V) comprises a liquefaction separation treatment device (14); a high-temperature flue gas outlet of the supercritical water oxidation reactor (1) is connected to a heat medium inlet of a main heat exchanger (2), a heat medium outlet of the main heat exchanger (2) is connected to a gas inlet of an expander (12), a power generation working medium outlet of the main heat exchanger (2) is connected to a turbine, the turbine drives a motor, the power generation working medium outlet of the turbine is sequentially connected with a high-temperature heat exchanger (7) and a low-temperature heat exchanger (8), one part of the power generation working medium outlet of the low-temperature heat exchanger (8) passes through a cooler (10) and a low-temperature compressor (11) and then is connected with a heat exchange inlet of the low-temperature heat exchanger (8) and a heat exchange inlet of the high-temperature heat exchanger (7), one part of the power generation working medium outlet of the high-temperature heat exchanger (7) passes through a high-; the low-temperature steam outlet of the expansion machine (12) is connected to a liquefaction separation processing device (14).
Supercritical carbon dioxide power generation unit (III) includes first turbine (3), second turbine (4), second motor (5), the electricity generation working medium export of main heat exchanger (2) is connected to first turbine (3) respectively, the electricity generation working medium entry of second turbine (4), first turbine (3) drive first motor (6), second turbine (4) drive second motor (5), first turbine (3), the electricity generation working medium export of second turbine (4) all connects gradually high temperature heat exchanger (7) and low temperature heat exchanger (8).
The working medium of the supercritical carbon dioxide power generation unit (III) is supercritical carbon dioxide.
The power generation method of the supercritical carbon dioxide power generation system combining the supercritical water oxidation technology comprises the following steps:
1) supercritical water oxidation unit (I) generates heat energy: the supercritical water oxidation unit (I) is used for treating sewage and sludge and generating heat energy;
2) the supercritical carbon dioxide power generation unit (III) generates power: the heat energy generated by the supercritical water oxidation unit (I) exchanges heat with a supercritical carbon dioxide working medium of the supercritical carbon dioxide power generation unit (III) after passing through the main heat exchanger, the supercritical carbon dioxide is used as the working medium to drive the turbine to rotate, and a transmission shaft of the turbine drives the motor to generate power;
3) circulating a supercritical carbon dioxide working medium: the supercritical carbon dioxide exhaust gas after the work of the turbine is sequentially cooled through a high-temperature heat exchanger (7) and a low-temperature heat exchanger (8), one part of the supercritical carbon dioxide from the low-temperature heat exchanger (8) enters a high-temperature compressor (9) and is compressed and then enters the high-temperature heat exchanger (7) for preheating, the other part of the supercritical carbon dioxide is further cooled to the inlet temperature of the low-temperature compressor (11) through a cooler (10), is compressed by the low-temperature compressor (11), enters the low-temperature heat exchanger (8) for preheating, then enters a high-temperature regenerator for preheating, enters a main heat exchanger together with the previous part of supercritical carbon dioxide for heat exchange, and the supercritical carbon dioxide after heat exchange and temperature rise enters a supercritical carbon dioxide power generation unit (III) again to drive the turbine to rotate and a motor to generate power;
4) the expander power generation unit (IV) generates power: part of the heat energy generated in the step 1) is heated by the main heat exchanger to supercritical carbon dioxide and then enters an expander power generation unit (IV) to be further converted into electric energy;
5) and (3) tail gas heat energy utilization and recovery: and (3) extracting part of supercritical carbon dioxide in the tail gas to be used as working medium in the supercritical carbon dioxide power generation unit (III) for timed supplement, and liquefying and separating the rest to generate the usable gas fertilizer.
The heat energy generated in the supercritical water oxidation treatment process is used as a heat source, and the heat source transfers the energy to a working medium, namely supercritical carbon dioxide, of a supercritical carbon dioxide power generation unit through a heat exchange unit; the heated supercritical carbon dioxide drives the power generation unit to generate power, the heat energy generated by supercritical water oxidation is only partially transferred to the supercritical carbon dioxide power generation unit, the rest heat energy enters the energy step utilization part, namely the expander power generation unit, and is further converted into electric energy, the low-temperature steam in the tail gas of the expander power generation unit can be used as heat supply, and the rest tail gas is liquefied and separated to obtain gas fertilizer, so that the energy recovery and utilization are greatly improved.
The supercritical water oxidation technology is a technology capable of realizing deep oxidation treatment on various organic wastes, takes supercritical water as a reaction medium, and completely converts organic matters into clean CO through homogeneous oxidation reaction2、H2O、N2And other harmless micromolecules, before the oxidation treatment, the supercritical state of water is firstly ensured, namely the temperature is more than 374 ℃, the pressure is more than 22.1MPa, after the oxidation reaction is normally carried out, the temperature and the pressure in the supercritical water oxidation reactor can reach about 650-1000 ℃, and the pressure is about 25-35 MPa, the supercritical water oxidation technology is adopted to treat the urban wastewater and the sludge, the treatment process generates a large amount of heat energy, the large amount of heat energy generated in the supercritical water oxidation process is converted into electric energy, and the ecological development mode combining the environmental pollution treatment and the energy development and utilization is realized.
The supercritical carbon dioxide is in a thermodynamic state above a critical point, namely a state with the temperature T being more than or equal to 31 ℃ and the pressure P being more than or equal to 74 atmospheres, is in a single phase state between liquid and gas, has unique physicochemical properties, has the viscosity close to gas, the density close to liquid and the diffusion coefficient between gas and liquid, has the characteristics of both gas and liquid, is easy to diffuse like gas and has strong dissolving capacity like liquid, and thus has high diffusivity and high solubility.
The supercritical carbon dioxide is used as a circulating working medium and a heat transfer fluid of a power generation system and is used for the energy conversion process of converting heat energy into electric energy, and the generator set is light in weight and small in size due to high density and simple circulation, and compared with other working media, the Brayton cycle efficiency is higher under the condition of lower temperature, so that the conversion of medium-low temperature heat energy resources into electric energy becomes possible.
The heat energy generated in unit time in the supercritical water oxidation treatment process is Q0Maintaining the heat energy required for the self-reaction as Q1Efficiency of heat exchange system η1(i.e., efficiency of heat transfer to supercritical carbon dioxide), efficiency η of supercritical carbon dioxide power generation system2And then the power generation amount of the system per unit time is as follows:
W1(η1，η2)＝(Q0-Q1)η1η2
according to different values of design parameters, the method comprises the following steps:
η1-taking 80% -90%;
η2-46% -55% of the powder.
Expander power generation system efficiency η3And then the converted electric energy of the system per unit time is as follows:
W2(η1，η3)＝(Q0-Q1)(1-η1)η3
in the formula:
η3-8% -15% of the sample.
Then, according to the technical scheme, the total generated energy per unit time is as follows:
W＝W1ten W2
＝(Q0-Q1)(η1η2+η3 -)
＝(Q0-Q1)T
In the formula:
η -the generating efficiency of the effective net output heat energy of this technical scheme is about 46.8 ~ 56.5%.
And by combining a heat energy step utilization part (low-temperature steam is used for heating), the utilization rate of the total net output heat energy of the system can reach more than 70%.
The utility model discloses a supercritical carbon dioxide power generation system's control system based on supercritical water oxidation technique adopts distributed computer control system to combine big data and cloud to calculate's intelligent control theory. The system under intelligent control comprises basic functions of starting and stopping programs, protecting the system and the generator, controlling load, controlling temperature, controlling the circulating amount of supercritical carbon dioxide in the system and the like. In addition, application parameters can be accumulated and analyzed through a cloud computing data system, energy conservation, emission reduction and efficiency improvement are achieved.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (3)
1. The utility model provides a supercritical carbon dioxide power generation system who combines supercritical water oxidation technique which characterized in that: the system comprises a supercritical water oxidation unit (I), a heat exchange unit (II), a supercritical carbon dioxide power generation unit (III), an expander power generation unit (IV) and a tail gas heat energy utilization and recovery unit (V); the supercritical water oxidation unit (I) comprises a supercritical water oxidation reactor (1), the heat exchange unit (II) comprises a main heat exchanger (2), the supercritical carbon dioxide power generation unit (III) comprises a turbine, a motor, a high-temperature heat exchanger (7), a low-temperature heat exchanger (8), a high-temperature compressor (9), a low-temperature compressor (11) and a cooler (10), and the expander power generation unit (IV) comprises an expander (12) and a generator (13); the tail gas heat energy utilization and recovery unit (V) comprises a liquefaction separation treatment device (14); a high-temperature flue gas outlet of the supercritical water oxidation reactor (1) is connected to a heat medium inlet of a main heat exchanger (2), a heat medium outlet of the main heat exchanger (2) is connected to a gas inlet of an expander (12), a power generation working medium outlet of the main heat exchanger (2) is connected to a turbine, the turbine drives a motor, the power generation working medium outlet of the turbine is sequentially connected with a high-temperature heat exchanger (7) and a low-temperature heat exchanger (8), one part of the power generation working medium outlet of the low-temperature heat exchanger (8) passes through a cooler (10) and a low-temperature compressor (11) and then is connected with a heat exchange inlet of the low-temperature heat exchanger (8) and a heat exchange inlet of the high-temperature heat exchanger (7), one part of the power generation working medium outlet of the high-temperature heat exchanger (7) passes through a high-; the low-temperature steam outlet of the expansion machine (12) is connected to a liquefaction separation processing device (14).
2. The supercritical carbon dioxide power generation system in combination with supercritical water oxidation technology of claim 1, wherein: supercritical carbon dioxide power generation unit (III) includes first turbine (3), second turbine (4), second motor (5), the electricity generation working medium export of main heat exchanger (2) is connected to the electricity generation working medium entry of first turbine (3), second turbine (4) respectively, first turbine (3) drive first motor (6), second turbine (4) drive second motor (5), first turbine (3), the electricity generation working medium export of second turbine (4) all connect gradually high temperature heat exchanger (7) and low temperature heat exchanger (8).
3. The supercritical carbon dioxide power generation system in combination with supercritical water oxidation technology of claim 1, wherein: and the working medium of the supercritical carbon dioxide power generation unit (III) is supercritical carbon dioxide.
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| CN110486107A (en) * | 2019-07-31 | 2019-11-22 | 碧流天能(北京)科技股份有限公司 | The supercritical carbon dioxide electricity generation system and method for joint supercritical Water Oxidation Technology |
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