A flue gas de-whitening system

Abstract

A flue gas desulfurization system. The conventional flue gas desulfurization system can cause the temperature of the clean flue gas to decrease, which is not conducive to the diffusion of the chimney emission, and even can cause the phenomenon of "gypsum rain" and the like to affect the surrounding environment. The utility model discloses a composition includes: flue gas waste heat heat release section heat exchanger, flue gas waste heat heat absorption section heat exchanger, dust remover and desulfurization system, the flue gas waste heat heat release section heat exchanger install at the out smoke pipe place after the dust remover, the flue gas waste heat heat absorption section heat exchanger install at the out smoke pipeline place after the desulfurization system, the water outlet of the flue gas waste heat heat release section heat exchanger is connected to the water inlet of the flue gas waste heat heat absorption section heat exchanger through the water outlet pipeline, and the water outlet of the flue gas waste heat heat absorption section heat exchanger is connected to the water inlet of the flue gas waste heat heat release section heat exchanger through the water inlet joint pipe. The utility model is used for flue gas desulfurization.

Description

Technical Field

[0001] This utility model relates to a flue gas dewhitening system. Background Technology

[0002] Traditional flue gas desulfurization (FGD) processes have some limitations during operation. For example, some FGD systems can cause a decrease in the temperature of the clean flue gas, forming a "white plume" (containing water vapor, soluble salts, etc.), which is detrimental to the dispersion of emissions from chimneys and may even lead to phenomena such as "gypsum rain," affecting the surrounding environment. This not only affects the visual appeal but may also raise public concerns about pollution. Direct emission of low-temperature flue gas can also result in heat waste, impacting the overall thermal efficiency of the power plant. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a flue gas whitening system.

[0004] The above objectives are achieved through the following technical solutions:

[0005] A flue gas desulfurization system comprises: a flue gas waste heat release section heat exchanger, a flue gas waste heat absorption section heat exchanger, a dust collector, and a desulfurization system. The flue gas waste heat release section heat exchanger is installed at the flue gas outlet pipe after the dust collector, and the flue gas waste heat absorption section heat exchanger is installed at the flue gas outlet pipe after the desulfurization system.

[0006] The water outlet of the flue gas waste heat release section heat exchanger is connected to the water inlet of the flue gas waste heat absorption section heat exchanger via an outlet pipe, and the water outlet of the flue gas waste heat absorption section heat exchanger is connected to the water inlet of the flue gas waste heat release section heat exchanger via an inlet connecting pipe.

[0007] The flue gas dewhitening system is equipped with a booster pump at the water inlet pipe. Beneficial effects

[0008] 1. This invention utilizes a heat exchange device to transfer the heat from the high-temperature flue gas before desulfurization to the low-temperature clean flue gas after desulfurization, thereby increasing the temperature of the clean flue gas, improving flue gas emission conditions, and reducing adverse environmental impacts. Simultaneously, in response to increasingly stringent environmental protection requirements, it helps improve the overall performance and operational efficiency of the desulfurization system, achieving more efficient and cleaner flue gas treatment. Attached Figure Description

[0009] Appendix Figure 1 This is a schematic diagram of the present invention;

[0010] In the diagram: 1. Dust collector; 2. Exhaust fan; 3. Heat exchanger for flue gas waste heat release section; 4. Water outlet pipe; 5. Water inlet connecting pipe; 6. Booster pump; 7. Pressure stabilizing water tank; 8. Makeup water pipe; 9. Chimney; 10. Heat exchanger for flue gas waste heat absorption section; 11. Desulfurization system. Detailed Implementation

[0011] Reference Figure 1 A flue gas desulfurization system comprises: a flue gas waste heat release section heat exchanger 3, a flue gas waste heat absorption section heat exchanger 10, a dust collector 1, and a desulfurization system 11. The flue gas waste heat release section heat exchanger is installed at the flue gas outlet pipe after the dust collector, and the flue gas waste heat absorption section heat exchanger is installed at the flue gas outlet pipe after the desulfurization system.

[0012] The water outlet of the flue gas waste heat release section heat exchanger is connected to the water inlet of the flue gas waste heat absorption section heat exchanger via the water outlet pipe 4, and the water outlet of the flue gas waste heat absorption section heat exchanger is connected to the water inlet of the flue gas waste heat release section heat exchanger via the water inlet connecting pipe 5.

[0013] A booster pump 6 is installed at the water inlet pipe.

[0014] Working principle: The high-temperature raw flue gas (120-150℃) from the outlet of the electrostatic precipitator enters the flue gas waste heat release section heat exchanger through the induced draft fan 2, transferring heat to the water in the heat exchange tubes of the flue gas waste heat release section heat exchanger. The temperature of the raw flue gas is reduced to about 90-100℃, and then it enters the desulfurization system. The low-temperature clean flue gas after desulfurization (about 45-55℃, saturated wet flue gas) enters the flue gas waste heat absorption section heat exchanger. The hot water after heat exchange in the flue gas waste heat release section heat exchanger enters the flue gas waste heat absorption section heat exchanger through the outlet water pipe. This hot water exchanges heat with the low-temperature flue gas after the desulfurization system, raising the flue gas temperature to about 80-90℃. The heated clean flue gas is discharged to the chimney, avoiding water vapor condensation to form "white smoke" and reducing the risk of chimney corrosion. The system is also equipped with a pressure stabilizing water tank 7, which is connected to the inlet water connection pipe through the water supply pipe 8 for water replenishment when water is insufficient.

Claims

1. A flue gas whitening system, characterized in that: Its components include: a flue gas waste heat release section heat exchanger, a flue gas waste heat absorption section heat exchanger, a dust collector, and a desulfurization system. The flue gas waste heat release section heat exchanger is installed at the flue gas outlet pipe after the dust collector, and the flue gas waste heat absorption section heat exchanger is installed at the flue gas outlet pipe after the desulfurization system. The water outlet of the flue gas waste heat release section heat exchanger is connected to the water inlet of the flue gas waste heat absorption section heat exchanger via an outlet pipe, and the water outlet of the flue gas waste heat absorption section heat exchanger is connected to the water inlet of the flue gas waste heat release section heat exchanger via an inlet connecting pipe.

2. The flue gas whitening system according to claim 1, characterized in that: A booster pump is installed at the water inlet pipe.

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