A vapor compression waste heat utilization system

Abstract

The utility model relates to thermal power plant waste heat utilization technical field discloses a steam compression waste heat utilization system, including desulfurizing tower, the lower part of desulfurizing tower is passed through pipeline and is communicated with the input end of flash tank, the steam output end of flash tank is connected with steam compressor, steam compressor is communicated with heat user through pipeline, the water outlet of flash tank is communicated with the upper part of desulfurizing tower, the utility model utilizes the waste heat of high temperature water to produce flash steam, and adds pressure to flash steam for industrial steam, recycles waste heat and precious water data, and the economic benefit is produced to the steam supply to the outside, and the steam supply parameter is not influenced by unit load, and need not increase the water consumption index of power plant.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology in thermal power plants, specifically a steam compression waste heat utilization system. Background Technology

[0002] This solution belongs to the field of waste heat utilization technology in thermal power plants. Currently, thermal power plants are energy-intensive industries, and their energy consumption and waste heat generation have always been key areas of research in energy conservation and emission reduction. Waste heat utilization technology can convert waste heat generated during power generation into reusable energy, significantly improving energy efficiency and helping to reduce carbon emissions from thermal power plants. By recovering waste heat, thermal power plants can reduce their dependence on raw materials and fuels, lower production costs, and contribute to environmental protection.

[0003] Current industrial steam supply typically employs either turbine extraction for external steam supply or main steam desuperheating and pressure reduction for external steam supply. Turbine extraction generally involves installing industrial extraction ports on the turbine block to supply industrial steam. Please refer to [link to relevant documentation]. Figure 1 Alternatively, a single stage of regenerative steam extraction can be used for industrial gas supply, or steam extraction can be achieved by drilling holes in cold reheat pipes, hot reheat pipes, and intermediate exhaust pipes. Please refer to [link / reference needed]. Figure 2 .

[0004] Current industrial steam supply typically involves extracting steam from the turbine itself for external supply. Large thermal power plant units operate under sliding pressure, meaning steam supply parameters are limited by unit load. To ensure extraction parameters meet user requirements, the units must operate above a certain load, impacting operational flexibility. Furthermore, industrial steam supply necessitates increased water usage quotas for power plants, which are difficult to increase in water-scarce regions. Utility Model Content

[0005] The purpose of this invention is to provide a steam compression waste heat utilization system that utilizes the waste heat of high-temperature water to generate flash steam, pressurizes the flash steam for industrial use, recovers waste heat and valuable water resources, generates economic benefits from external steam supply, and whose steam supply parameters are not affected by the unit load and do not require increasing the power plant's water consumption index.

[0006] This utility model is implemented as follows:

[0007] A steam compression waste heat utilization system includes a desulfurization tower, the lower part of which is connected to the input end of a flash tank via a pipeline, the steam output end of the flash tank is connected to a steam compressor, the steam compressor is connected to a heat user via a pipeline, and the water outlet end of the flash tank is connected to the upper part of the desulfurization tower.

[0008] Furthermore, the steam compressor is driven by an electric motor or a steam turbine.

[0009] Furthermore, multiple steam compressors are used in combination to supply steam to heat users with different steam consumption parameters.

[0010] Furthermore, a spraying device is installed at the top of the desulfurization tower, the water outlet of the flash tank is connected to the spraying device, and a slurry pump is connected between the water outlet of the flash tank and the spraying device.

[0011] Furthermore, the spray nozzles of the spray device cover the cross-section of the desulfurization tower.

[0012] Furthermore, the input end of the flash tank is connected to a flue gas waste heat utilization heat exchanger, which is installed inside the flue. The high-temperature water output end of the flue gas waste heat utilization heat exchanger is connected to the input end of the flash tank, and the low-temperature water output end of the flash tank is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger.

[0013] Furthermore, the waste heat utilization heat exchanger for flue gas is a gas-water heat exchanger.

[0014] Furthermore, the low-temperature water output end of the flash tank is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger via a circulating pump.

[0015] Furthermore, an economizer is provided at the input end of the flue gas waste heat utilization heat exchanger, and an air preheater is provided between the economizer and the flue gas waste heat utilization heat exchanger.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In practical applications, the high-temperature desulfurization slurry from the lower part of the desulfurization tower is piped to a flash tank. The steam generated in the flash tank is fed into a steam compressor, which is either driven by an electric motor or a steam turbine. The steam compressor pressurizes the flashed steam and sends it to heat users for industrial use. The low-temperature desulfurization slurry output from the outlet of the flash tank is sent back to the upper part of the desulfurization tower for reheating and reuse. This invention utilizes the waste heat of high-temperature water to generate flash steam and pressurizes it for industrial use, recovering waste heat and valuable water resources. It generates economic benefits from external steam supply, and the steam supply parameters are not affected by the unit load, eliminating the need to increase the power plant's water consumption indicators. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1This is a schematic diagram of the existing technology for extracting steam from the steam turbine body to supply industrial steam.

[0020] Figure 2 This is a schematic diagram of the existing technology for extracting steam from the intermediate exhaust, reheat cold section, and reheat hot section to supply industrial steam.

[0021] Figure 3 This is a schematic diagram of the process of generating flash steam from desulfurization slurry and compressing it for industrial use according to this utility model.

[0022] Figure 4 This is a schematic diagram of the process of using high-temperature water generated from waste heat of flue gas for flash evaporation and compression to supply industrial steam.

[0023] Figure labels: 1. Desulfurization tower; 2. Flash tank; 3. Steam compressor; 4. Heat user; 5. Spraying device; 6. Slurry pump; 7. Economizer; 8. Flue gas waste heat utilization heat exchanger; 9. Air preheater; 10. Circulation pump. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] Please see Figure 3 A steam compression waste heat utilization system includes a desulfurization tower 1, the lower part of which is connected to the input end of a flash tank 2 via a pipeline, the steam output end of the flash tank 2 is connected to a steam compressor 3, the steam compressor 3 is connected to a heat user 4 via a pipeline, and the water outlet end of the flash tank 2 is connected to the upper part of the desulfurization tower 1.

[0026] In practical applications, the high-temperature desulfurization slurry from the lower part of the desulfurization tower 1 is piped to the flash tank 2. The steam generated by the flash tank 2 is sent to the steam compressor 3. The steam compressor 3 is driven by an electric motor or a steam turbine. The steam compressor 3 pressurizes the flashed steam and sends it to the heat user 4 for industrial steam. The low-temperature desulfurization slurry output from the outlet of the flash tank 2 is sent back to the upper part of the desulfurization tower 1 for reheating and reuse. This utility model utilizes the waste heat of high-temperature water to generate flash steam and pressurizes the flash steam for industrial steam, recovering waste heat and valuable water resources. It generates economic benefits from external steam supply, and the steam supply parameters are not affected by the unit load, so there is no need to increase the power plant's water consumption index.

[0027] Please see Figure 3 Multiple steam compressors 3 are used in combination to supply steam to heat users with different steam consumption parameters through series, parallel or other combinations.

[0028] Please see Figure 3 A spraying device 5 is installed on the upper part of the desulfurization tower 1. The water outlet of the flash tank 2 is connected to the spraying device 5. A slurry pump 6 is connected between the water outlet of the flash tank 2 and the spraying device 5.

[0029] Driven by the slurry pump 6, the low-temperature desulfurization slurry output from the outlet of the flash tank 2 is sent back to the spray device 5 of the desulfurization tower 1. The nozzle of the spray device 5 covers the cross-section of the desulfurization tower 1. The low-temperature desulfurization slurry is sprayed out through the spray nozzle of the spray device 5 to contact the high-temperature flue gas, thereby increasing the heating area of ​​the low-temperature desulfurization slurry and accelerating the heating of the low-temperature desulfurization slurry. This allows the low-temperature desulfurization slurry to be rapidly heated and transformed into a high-temperature slurry for repeated use.

[0030] Please see Figure 4 The input end of the flash tank 2 is connected to a flue gas waste heat utilization heat exchanger 8, which is installed in the flue. The high-temperature water output end of the flue gas waste heat utilization heat exchanger 8 is connected to the input end of the flash tank 2, and the low-temperature water output end of the flash tank 2 is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger 8.

[0031] High-temperature flue gas output from the flue at the front end of the desulfurization tower enters the flue gas waste heat utilization heat exchanger 8. After heat exchange treatment by the flue gas waste heat utilization heat exchanger 8, high-temperature water is output. The high-temperature water enters the flash tank 2 to generate flash steam. The flash steam enters the steam compressor 3 to supply steam to the outside. The low-temperature water output end of the flash tank 2 is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger 8 through the circulation pump 10. After heat exchange, the saturated low-temperature water returns to the flue gas waste heat utilization heat exchanger 8 under the action of the circulation pump 10, and the cycle repeats; this can further fully utilize the waste heat.

[0032] Please see Figure 4An economizer 7 is provided at the input end of the flue gas waste heat utilization heat exchanger 8, and an air preheater 9 is provided between the economizer 7 and the flue gas waste heat utilization heat exchanger 8.

[0033] The high-temperature flue gas is successively recovered and utilized through economizer 7, air preheater 9 and flue gas waste heat utilization heat exchanger 8. The waste heat of the output high-temperature flue gas is fully utilized to heat the demineralized water, so that the demineralized water reaches a certain temperature. During the heat exchange process, the high-temperature flue gas transfers heat to the demineralized water, so that the temperature of the demineralized water rises and becomes high-temperature water that enters the flash tank 2. The saturated low-temperature water output from the flash tank 2 returns to the flue gas waste heat utilization heat exchanger 8 under the action of the circulation pump, and the cycle repeats.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A steam compression waste heat utilization system, characterized in that: The system includes a desulfurization tower (1), the lower part of which is connected to the input end of a flash tank (2) via a pipeline. The steam output end of the flash tank (2) is connected to a steam compressor (3), which is connected to a heat user (4) via a pipeline. The water outlet end of the flash tank (2) is connected to the upper part of the desulfurization tower (1).

2. The steam compression waste heat utilization system according to claim 1, characterized in that, The steam compressor (3) is driven by an electric motor or a steam turbine.

3. The steam compression waste heat utilization system according to claim 1, characterized in that, Multiple steam compressors (3) are used in combination to supply steam to heat users with different steam consumption parameters.

4. The steam compression waste heat utilization system according to claim 1, characterized in that, A spraying device (5) is provided on the upper part of the desulfurization tower (1), the water outlet of the flash tank (2) is connected to the spraying device (5), and a slurry pump (6) is connected between the water outlet of the flash tank (2) and the spraying device (5).

5. A steam compression waste heat utilization system according to claim 4, characterized in that, The nozzle of the spray device (5) covers the cross-section of the desulfurization tower (1).

6. A steam compression waste heat utilization system according to claim 1, characterized in that, The input end of the flash tank (2) is connected to a flue gas waste heat utilization heat exchanger (8), which is installed in the flue. The high-temperature water output end of the flue gas waste heat utilization heat exchanger (8) is connected to the input end of the flash tank (2), and the low-temperature water output end of the flash tank (2) is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger (8).

7. A steam compression waste heat utilization system according to claim 6, characterized in that, The waste heat utilization heat exchanger (8) is a gas-water heat exchanger.

8. A steam compression waste heat utilization system according to claim 6, characterized in that, The low-temperature water output end of the flash tank (2) is connected to the low-temperature water input end of the flue gas waste heat utilization heat exchanger (8) through a circulating pump (10).

9. A steam compression waste heat utilization system according to claim 6, characterized in that, An economizer (7) is provided at the input end of the flue gas waste heat utilization heat exchanger (8), and an air preheater (9) is provided between the economizer (7) and the flue gas waste heat utilization heat exchanger (8).

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