CN213392299U - Supercritical CO2 power generation system for drying lignite by using exhaust gas - Google Patents
Supercritical CO2 power generation system for drying lignite by using exhaust gas Download PDFInfo
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- CN213392299U CN213392299U CN202022255690.9U CN202022255690U CN213392299U CN 213392299 U CN213392299 U CN 213392299U CN 202022255690 U CN202022255690 U CN 202022255690U CN 213392299 U CN213392299 U CN 213392299U
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Abstract
The utility model discloses an utilize supercritical CO2 power generation system of exhaust drying brown coal, this system includes supercritical CO2 coal-fired power generation system and brown coal exhaust predrying system, and supercritical CO2 coal-fired power generation system includes boiler, main compressor, recompressor, turbine, low temperature regenerator, high temperature regenerator and precooler, and brown coal exhaust predrying system includes flow control valve, dividing wall formula desiccator and condenser; the medium temperature working medium of a shunting part of a hot side outlet of the high-temperature heat regenerator enters the dividing wall type dryer to heat the lignite, so that the moisture in the lignite is removed, the aim of pre-drying the lignite is fulfilled, and the heat required by drying the lignite is adjusted by adjusting the flow of the working medium in the dividing wall type dryer through the flow adjusting valve. The utility model discloses reduce the moisture in the brown coal, improve the brown coal calorific value, can improve boiler efficiency, reduce the station service power to improve system energy utilization efficiency by a wide margin.
Description
Technical Field
The utility model relates to a power generation technical field, concretely relates to utilize supercritical CO2 power generation system and of exhaust drying brown coal.
Background
The supercritical CO2 power cycle has the advantages of high thermal efficiency, simple system, high flexibility, low investment, low operation and maintenance cost and the like, and has wide application prospect in the field of coal-fired power generation. Research shows that compared with a conventional steam Rankine cycle coal-fired power generator set, the coal-fired power generation system based on the supercritical CO2 power cycle has higher power generation efficiency and lower investment, and is expected to be applied in a large scale. The current research on the supercritical CO2 cycle in the field of coal-fired power generation considers less changes of coal types, and particularly lacks research on a lignite power generation system. The lignite reserves in China are abundant, the reserve volume is proved to reach 1300 hundred million tons, the reserve volume accounts for 12 percent of the coal reserves in China, the price is low, and the lignite reserves become the main fuel of thermal power generation in China. However, because the moisture content of the lignite is high, the heat value is low, the energy utilization efficiency of the direct-fired lignite power generation system is low, and the equipment cost is high.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide an utilize supercritical CO2 power generation system of exhaust drying brown coal, this system is through arranging the dividing wall formula desiccator and low temperature regenerator are parallelly connected, utilizes the dry brown coal of heat that the medium temperature exhaust of high temperature regenerator export carried, and moisture in the desorption brown coal improves the brown coal calorific value to realize reducing boiler cost, the purpose that improves system energy utilization efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a supercritical CO2 power generation system for drying lignite by using exhaust gas comprises a supercritical CO2 coal-fired power generation system and a lignite exhaust gas pre-drying system; wherein the content of the first and second substances,
the supercritical CO2 coal-fired power generation system comprises a main compressor 1, a low-temperature heat regenerator 2, a high-temperature heat regenerator 3, a boiler 4, a turbine 5, a precooler 6 and a recompression machine 7, wherein an outlet of the main compressor 1, a cold-side inlet and outlet of the low-temperature heat regenerator 2, a cold-side inlet and outlet of the high-temperature heat regenerator 3, an inlet and outlet of the boiler 4, an inlet and outlet of the turbine 5, an inlet and outlet of a hot side of the high-temperature heat regenerator 3, an inlet and outlet of a hot side of the low-temperature heat regenerator 2; an inlet and an outlet of the recompressor 7 are respectively communicated with an outlet at the hot side of the low-temperature heat regenerator 2 and an outlet at the cold side of the low-temperature heat regenerator 2;
the lignite exhaust pre-drying system comprises a flow regulating valve 8, a dividing wall type dryer 9 and a condenser 10, wherein a hot side inlet of the low-temperature heat regenerator 2, an inlet and an outlet of the flow regulating valve 8, an inlet and an outlet of the dividing wall type dryer 9 and a hot side outlet of the low-temperature heat regenerator 2 are sequentially communicated, dry coal at an outlet of the dividing wall type dryer 9 is fed into the boiler 4, and an exhaust outlet of the dividing wall type dryer 9 is communicated with an inlet of the condenser 10.
The dividing wall type dryer 9 and the low-temperature heat regenerator 2 are arranged in parallel, medium-temperature exhaust gas at the hot side outlet of the high-temperature heat regenerator 3 is divided into two parts, and the two parts enter the dividing wall type dryer 9 and the low-temperature heat regenerator 2 respectively to be recombined after releasing heat.
The flow regulating valve 8 regulates the supercritical CO2 working medium flow of the dividing wall type dryer 9, so that the heat input into the dividing wall type dryer 9 is regulated.
The supercritical CO2 at the inlet of the dividing wall type dryer 9 has the temperature higher than 150 ℃ and is used for drying raw coal.
According to the working method of the supercritical CO2 power generation system for drying lignite by using exhaust gas, a supercritical CO2 working medium is boosted by a main compressor 1, then the working medium absorbs heat in a low-temperature heat regenerator 2, a high-temperature heat regenerator 3 and a boiler 4 in sequence and then enters a turbine 5 to do work, and the exhaust gas of the turbine 5 is released heat in the high-temperature heat regenerator 3 and then is divided into two parts: one part enters the low-temperature heat regenerator 2 to continuously release heat, the other part enters the dividing wall type dryer 9 through the flow regulating valve 8 to heat the lignite, and then the two working media are converged; the converged working medium is divided into two parts again, one part enters the main compressor 1 after being cooled by the precooler 6 to complete closed power generation circulation, and the other part is subjected to pressure boosting by the recompressor 7 and then converged into a cold side outlet of the low-temperature heat regenerator 2;
the lignite is heated in the dividing wall type dryer 9, the evaporated steam exhaust enters the condenser 10 to be condensed into liquid water, and the dehydrated dry lignite is sent to the boiler 4 to be combusted.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model discloses brown coal exhaust pre-drying system only includes dividing wall formula desiccator and condenser, and the system is comparatively simple.
2 the utility model reduces the water content of the fuel by drying the brown coal, improves the heat value of the fuel, can reduce the exhaust gas temperature of the boiler, and improves the efficiency of the boiler; the fuel consumption, the air quantity and the flue gas quantity can be reduced, the power consumption of a coal mill, a blower and an induced draft fan is reduced, the plant power consumption is reduced, and the boiler cost can also be reduced.
3 the utility model discloses can improve system energy utilization efficiency by a wide margin.
Drawings
Fig. 1 is a schematic diagram of a supercritical CO2 power generation system for drying lignite by using exhaust gas according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model relates to a supercritical CO2 power generation system for drying lignite by using exhaust gas, which comprises a supercritical CO2 coal-fired power generation system and a lignite exhaust pre-drying system; wherein the content of the first and second substances,
the supercritical CO2 coal-fired power generation system comprises a main compressor 1, a low-temperature heat regenerator 2, a high-temperature heat regenerator 3, a boiler 4, a turbine 5, a precooler 6 and a recompression machine 7, wherein an outlet of the main compressor 1, a cold-side inlet and outlet of the low-temperature heat regenerator 2, a cold-side inlet and outlet of the high-temperature heat regenerator 3, an inlet and outlet of the boiler 4, an inlet and outlet of the turbine 5, an inlet and outlet of a hot side of the high-temperature heat regenerator 3, an inlet and outlet of a hot side of the low-temperature heat regenerator 2; an inlet and an outlet of the recompressor 7 are respectively communicated with an outlet at the hot side of the low-temperature heat regenerator 2 and an outlet at the cold side of the low-temperature heat regenerator 2;
the lignite exhaust pre-drying system comprises a flow regulating valve 8, a dividing wall type dryer 9 and a condenser 10, wherein a hot side inlet of the low-temperature heat regenerator 2, an inlet and an outlet of the flow regulating valve 8, an inlet and an outlet of the dividing wall type dryer 9 and a hot side outlet of the low-temperature heat regenerator 2 are sequentially communicated, dry coal at an outlet of the dividing wall type dryer 9 is fed into the boiler 4, and an exhaust outlet of the dividing wall type dryer 9 is communicated with an inlet of the condenser 10.
As the preferred embodiment of the present invention, the dividing wall type dryer 9 and the low temperature regenerator 2 are arranged in parallel, and the medium temperature exhaust at the hot side outlet of the high temperature regenerator 3 is divided into two paths, and enters the dividing wall type dryer 9 and the low temperature regenerator 2 respectively to release heat and then join again.
As a preferred embodiment of the present invention, the flow regulating valve 8 regulates the flow rate of the supercritical CO2 working medium of the dividing wall type dryer 9, thereby regulating the heat input into the dividing wall type dryer 9.
As a preferred embodiment of the present invention, the supercritical CO2 at the inlet of the dividing wall dryer 9 has a temperature higher than 150 ℃ for drying raw coal.
As shown in fig. 1, the utility model relates to a working method of a supercritical CO2 power generation system for drying lignite by exhaust gas, which is characterized in that: the supercritical CO2 working medium is boosted by the main compressor 1, then absorbs heat in the low-temperature heat regenerator 2, the high-temperature heat regenerator 3 and the boiler 4 in sequence and then enters the turbine 5 to do work, and the exhaust gas of the turbine 5 is released heat in the high-temperature heat regenerator 3 and then is divided into two parts: one part enters the low-temperature heat regenerator 2 to continuously release heat, the other part enters the dividing wall type dryer 9 through the flow regulating valve 8 to heat the lignite, and then the two working media are converged; the converged working medium is divided into two parts again, one part enters the main compressor 1 after being cooled by the precooler 6 to complete closed power generation circulation, and the other part is converged into the cold side outlet of the low-temperature heat regenerator 2 after being boosted by the recompressor 7.
The lignite is heated in the dividing wall type dryer 9, the evaporated steam exhaust enters the condenser 10 to be condensed into liquid water, and the dehydrated dry lignite is sent to the boiler 4 to be combusted.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A supercritical CO2 power generation system for drying lignite by using exhaust gas is characterized in that: the system comprises a supercritical CO2 coal-fired power generation system and a lignite exhaust pre-drying system; wherein the content of the first and second substances,
the supercritical CO2 coal-fired power generation system comprises a main compressor (1), a low-temperature heat regenerator (2), a high-temperature heat regenerator (3), a boiler (4), a turbine (5), a precooler (6) and a recompressor (7), wherein an outlet of the main compressor (1), a cold-side inlet and outlet of the low-temperature heat regenerator (2), a cold-side inlet and outlet of the high-temperature heat regenerator (3), an inlet and outlet of the boiler (4), an inlet and outlet of the turbine (5), an inlet and outlet of a hot side of the high-temperature heat regenerator (3), an inlet and outlet of a hot side of the low-temperature heat regenerator (2), an inlet and outlet of the precooler (; an inlet and an outlet of the recompressor (7) are respectively communicated with a hot side outlet of the low-temperature regenerator (2) and a cold side outlet of the low-temperature regenerator (2);
the lignite exhaust pre-drying system comprises a flow regulating valve (8), a dividing wall type dryer (9) and a condenser (10), wherein a hot side inlet of the low-temperature heat regenerator (2), an inlet and an outlet of the flow regulating valve (8), an inlet and an outlet of the dividing wall type dryer (9) and a hot side outlet of the low-temperature heat regenerator (2) are sequentially communicated, a dried coal outlet of the dividing wall type dryer (9) is communicated with a boiler (4) and sends dried coal into the boiler (4), and an exhaust outlet of the dividing wall type dryer (9) is communicated with an inlet of the condenser (10).
2. The supercritical CO2 power generation system for lignite drying with exhaust gas as claimed in claim 1, wherein: the dividing wall type dryer (9) and the low-temperature heat regenerator (2) are arranged in parallel, medium-temperature exhaust gas at a hot side outlet of the high-temperature heat regenerator (3) is divided into two parts, and the two parts enter the dividing wall type dryer (9) and the low-temperature heat regenerator (2) respectively to be recombined after heat release.
3. The supercritical CO2 power generation system for lignite drying with exhaust gas as claimed in claim 1, wherein: the supercritical CO2 temperature at the inlet of the dividing wall type dryer (9) is above 150 ℃, and the dividing wall type dryer is used for drying raw coal.
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| CN202022255690.9U CN213392299U (en) | 2020-10-12 | 2020-10-12 | Supercritical CO2 power generation system for drying lignite by using exhaust gas |
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| CN202022255690.9U CN213392299U (en) | 2020-10-12 | 2020-10-12 | Supercritical CO2 power generation system for drying lignite by using exhaust gas |
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