Dry quenching supercritical carbon dioxide power generation thermodynamic system

Abstract

The utility model relates to a dry quenching supercritical carbon dioxide power generation thermodynamic system which comprises a dry quenching boiler, a CO2-flue gas heat exchanger, a turbine, a power generator, a high-temperature heat regenerator, a low-temperature heat regenerator, a cooler, a main compressor and an auxiliary compressor. The turbine is sequentially connected with the high-temperature heat regenerator and the low-temperature heat regenerator, the high-temperature side of the low-temperature heat regenerator is connected with the auxiliary compressor and the cooler, the cooler is connected with the main compressor, the main compressor is connected with the low-temperature side of the low-temperature heat regenerator, and the low-temperature side of the low-temperature heat regenerator and the auxiliary compressor are connected in parallel and jointly connected into the low-temperature side of the high-temperature heat regenerator. The supercritical CO2 power generation system has the beneficial effects that the system is relatively simple, the arrangement is more compact, the occupied area is saved, the power generation efficiency can be greatly improved by a supercritical CO2 power generation technology, the power generation amount is increased, and huge economic benefits can be brought to enterprises.

Description

TECHNICAL FIELD

[0001] The utility model relates to coking waste heat utilization technical field especially relates to a dry quenching supercritical carbon dioxide power generation thermal system. BACKGROUND

[0002] The dry quenching flue gas steam turbine unit is used for power generation, and due to the steam Rankine cycle of the steam turbine unit being subject to the characteristics of the circulating working medium, there are low power generation efficiency and other difficult-to-overcome drawbacks. The dry quenching steam turbine generator set is mostly a condensing type unit, and the low-temperature exhaust steam is condensed in the condenser, and most of the heat released is taken to the cooling tower by circulating water and discharged into the atmosphere, and the condensation heat loss accounts for more than 40% of the total heat entering the steam turbine.

[0003] The power generation field has been exploring new technologies for improving power generation capacity, and supercritical CO2 power generation technology is one of them. The supercritical CO2 power generation supercritical state CO2 pressure boosting, heat exchange control and other applications have been important projects in various fields. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a dry quenching supercritical carbon dioxide power generation thermal system, and the utility model takes supercritical CO2 as an energy conversion working medium, heats CO2 with the heat of the high-temperature section of the dry quenching circulating gas, uses the Brayton cycle principle, and scientifically designs and reasonably matches the working medium characteristics, thermal processes and system equipment to form a new power conversion technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A dry quenching supercritical carbon dioxide power generation thermal system, comprising a dry quenching boiler, a CO2-flue gas heat exchanger, a turbine, a generator, a high-temperature regenerator, a low-temperature regenerator, a cooler, a main compressor and an auxiliary compressor, the CO2-flue gas heat exchanger is arranged at the top of the dry quenching boiler, the heat exchange outlet of the CO2-flue gas heat exchanger is connected with the turbine, the turbine is connected with the generator, the gas outlet of the turbine is connected with the high-temperature side of the high-temperature regenerator and the low-temperature regenerator in sequence, the high-temperature side outlet of the low-temperature regenerator is connected with the auxiliary compressor and the cooler respectively, the outlet of the cooler is connected with the main compressor, the outlet of the main compressor is connected with the low-temperature side of the low-temperature regenerator, the low-temperature side outlet of the low-temperature regenerator is connected with the outlet of the auxiliary compressor in parallel and then connected with the low-temperature side of the high-temperature regenerator, and the low-temperature side outlet of the high-temperature regenerator is connected with the inlet of the CO2-flue gas heat exchanger.

[0007] A dry quenching supercritical carbon dioxide power generation thermal system, comprising a dry quenching boiler, a CO2-flue gas heat exchanger, a turbine, a generator, a high-temperature regenerator, a low-temperature regenerator, a cooler, a main compressor and a secondary compressor, wherein the CO2-flue gas heat exchanger is arranged at the front end of the dry quenching boiler, the dry quenching circulating gas outlet of the CO2-flue gas heat exchanger is connected with the dry quenching circulating gas inlet of the dry quenching boiler, the heat exchange outlet of the CO2-flue gas heat exchanger is connected with the turbine, the turbine is connected with the generator, the gas outlet of the turbine is connected with the high-temperature side of the high-temperature regenerator and the low-temperature regenerator in sequence, the high-temperature side outlet of the low-temperature regenerator is connected with the secondary compressor and the cooler respectively, the outlet of the cooler is connected with the main compressor, the outlet of the main compressor is connected with the low-temperature side of the low-temperature regenerator, the low-temperature side outlet of the low-temperature regenerator is connected with the outlet of the secondary compressor in parallel and then connected with the low-temperature side of the high-temperature regenerator, and the low-temperature side outlet of the high-temperature regenerator is connected with the inlet of the CO2-flue gas heat exchanger.

[0008] Further, the CO2-flue gas heat exchanger is arranged at the top of the dry quenching boiler in a fixed manner of suspension or support structure.

[0009] Further, the CO2-flue gas heat exchanger arranged at the front end of the dry quenching boiler is independently arranged.

[0010] Further, the dry quenching boiler is connected with a boiler water-steam system at the lower part.

[0011] Further, the boiler water-steam system comprises boiler feed water and steam external supply.

[0012] Further, the steam external supply comprises production operation, heating and power generation.

[0013] Further, the boiler water-steam system is arranged according to the heat exchange interval of the CO2-flue gas heat exchanger.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] 1) The utility model uses supercritical CO2 as energy conversion working medium, uses the heat of the dry quenching circulating gas high-temperature section to heat CO2, uses the principle of the Brayton cycle to scientifically design and reasonably match the working medium characteristics, thermal process and system equipment to form a new power conversion technology, and compared with the traditional steam power generation technology using water as circulating medium, the working medium CO2 has no phase change process in the whole cycle, the consumption of circulating water is reduced, energy consumption is saved, the dry quenching circulating gas is fully utilized, and energy waste of the dry quenching circulating gas is avoided.

[0016] 2) CO2-flue gas heat exchanger is integrated on the upper part of dry quenching boiler, can be fixed by suspension or support structure, CO2-flue gas heat exchanger can also be independently arranged in front of dry quenching boiler, the heat in dry quenching circulating gas is directly exchanged with the heat of CO2 first, the utilization rate of dry quenching circulating flue gas is improved, which is beneficial to the heat absorption of supercritical CO2 working medium and helps to improve the power generation efficiency.

[0017] 3) Dry quenching circulating gas exchanges heat with liquid water in boiler feed water in the boiler water system after heat exchange with CO2 first, liquid water is heated into water vapor for external supply, further improving the utilization rate of dry quenching circulating gas, the heat absorption temperature range of CO2-flue gas heat exchanger is large, the design of dry quenching boiler water system is adjusted according to the heat absorption temperature range of CO2-flue gas heat exchanger, further making full use of the heat in dry quenching circulating flue gas, improving the heat conversion amount, and avoiding the waste of dry quenching circulating gas energy.

[0018] 4) After the quenching circulating gas passes through the CO2-flue gas heat exchanger, further heat exchange with the dry quenching boiler water system can produce steam for external supply, the dry quenching boiler can produce low-pressure or medium-pressure steam with various parameters according to user demand, and the steam is used for production operation, heating or power generation, etc., has wide application range, strong practicability, high utilization rate and high economic value.

[0019] 5) The system of supercritical CO2 waste heat power generation is relatively simple and compact, saves the land occupation, and the supercritical CO2 power generation technology can greatly improve the power generation efficiency and increase the power generation capacity, which can bring great economic benefits to enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a kind of dry quenching supercritical carbon dioxide power generation heat system process flow chart.

[0021] In the figure: 1. Dry quenching boiler;2. CO2-flue gas heat exchanger;3. Turbine;4. Generator;5. High temperature regenerator;6. Low temperature regenerator;7. Cooler;8. Main compressor;9. Auxiliary compressor. DETAILED DESCRIPTION

[0022] The specific embodiments of the utility model will be further described below in combination with the drawings:

[0023]

Example 1

[0024] Further, the lower part of the dry quenching boiler 1 is connected to a boiler steam-water system.

[0025] Further, the boiler steam-water system includes boiler feed water and steam external supply.

[0026] Further, the steam external supply includes production operation, heating, and power generation.

[0027] Further, the boiler steam-water system is arranged according to the heat exchange interval of the CO2-flue gas heat exchanger 2.

[0028]

Embodiment 2

[0029] Further, the dry quenching boiler 1 is connected to a boiler steam-water system.

[0030] Further, the boiler steam-water system comprises boiler feed water and steam external supply.

[0031] Further, the steam external supply comprises production operation, heating and power generation.

[0032] Further, the boiler steam-water system is arranged according to the heat exchange range of the CO2-flue gas heat exchanger 2.

[0033] The above merely describes the preferred embodiments of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes to the technical scheme and concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A dry quenching supercritical carbon dioxide power generation thermal system comprising a dry quenching boiler, a CO2-flue gas heat exchanger, a turbine, a generator, a high temperature recuperator, a low temperature recuperator, a cooler, a main compressor, a secondary compressor, characterized in that, The CO2-flue gas heat exchanger is arranged at the top of the dry quenching boiler, the heat exchange outlet of the CO2-flue gas heat exchanger is connected with the turbine, the turbine is connected with the generator, the gas outlet of the turbine is connected with the high-temperature side of the high-temperature regenerator and the low-temperature side of the low-temperature regenerator in sequence, the high-temperature side outlet of the low-temperature regenerator is connected with the auxiliary compressor and the cooler respectively, the outlet of the cooler is connected with the main compressor, the outlet of the main compressor is connected with the low-temperature side of the low-temperature regenerator, the low-temperature side outlet of the low-temperature regenerator is connected with the outlet of the auxiliary compressor in parallel and is connected with the low-temperature side of the high-temperature regenerator, and the low-temperature side outlet of the high-temperature regenerator is connected with the inlet of the CO2-flue gas heat exchanger.

2. A dry quenching supercritical carbon dioxide power generation thermal system according to claim 1, characterized in that, The fixed mode of the CO2-flue gas heat exchanger arranged at the top of the dry quenching boiler adopts a suspension or support structure.

3. A dry quenching supercritical carbon dioxide power generation thermal system comprising a dry quenching boiler, a CO2-flue gas heat exchanger, a turbine, a generator, a high temperature recuperator, a low temperature recuperator, a cooler, a main compressor, a secondary compressor, characterized in that, The CO2-flue gas heat exchanger is arranged at the front end of the dry quenching boiler, the dry quenching circulating gas outlet of the CO2-flue gas heat exchanger is connected with the dry quenching boiler circulating gas inlet, the heat exchange outlet of the CO2-flue gas heat exchanger is connected with the turbine, the turbine is connected with the generator, the gas outlet of the turbine is connected with the high-temperature side of the high-temperature regenerator and the low-temperature side of the low-temperature regenerator in sequence, the high-temperature side outlet of the low-temperature regenerator is connected with the auxiliary compressor and the cooler respectively, the outlet of the cooler is connected with the main compressor, the outlet of the main compressor is connected with the low-temperature side of the low-temperature regenerator, the low-temperature side outlet of the low-temperature regenerator is connected with the outlet of the auxiliary compressor in parallel and is connected with the low-temperature side of the high-temperature regenerator, and the low-temperature side outlet of the high-temperature regenerator is connected with the inlet of the CO2-flue gas heat exchanger.

4. A dry quenching supercritical carbon dioxide power generation thermal system according to claim 3, wherein, The CO2-flue gas heat exchanger arranged at the front end of the dry quenching boiler is independently arranged.

5. The dry quenching supercritical carbon dioxide power generation thermal system according to claim 1 or 3, characterized in that, The lower part of the dry quenching boiler is connected with the boiler steam-water system.

6. A dry quenching supercritical carbon dioxide power generation thermal system according to claim 5, wherein, The boiler steam-water system comprises boiler feed water and steam external supply.

7. A dry quenching supercritical carbon dioxide power generation thermal system according to claim 6, wherein, The steam external supply comprises production operation, heating and power generation.

8. A dry quenching supercritical carbon dioxide power generation thermal system according to claim 5, wherein, The boiler steam-water system is arranged according to the heat exchange interval of the CO2-flue gas heat exchanger. The CO2-flue gas heat exchanger is arranged at the top of the dry quenching boiler, the heat exchange outlet of the CO2-flue gas heat exchanger is connected with the turbine, the turbine is connected with the generator, the gas outlet of the turbine is connected with the high-temperature side of the high-temperature regenerator and the low-temperature side of the low-temperature regenerator in sequence, the high-temperature side outlet of the low-temperature regenerator is connected with the auxiliary compressor and the cooler respectively, the outlet of the cooler is connected with the main compressor, the outlet of the main compressor is connected with the low-temperature side of the low-temperature regenerator, the low-temperature side outlet of the low-temperature regenerator is connected with the outlet of the auxiliary compressor in parallel and is connected with the low-temperature side of the high-temperature regenerator, and the low-temperature side outlet of the high-temperature regenerator is connected with the inlet of the CO2-flue gas heat exchanger.

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