Ammonia desulfurization vacuum concentration waste heat utilization system

Abstract

The utility model discloses a kind of ammonia desulfurization vacuum concentration waste heat utilization systems, belong to waste heat utilization technical field, comprising: desulfurization tower, the desulfurization tower includes adsorption spray chamber and concentration spray chamber, ammonia water storage unit receives slurry in the adsorption spray chamber and is transported back in the adsorption spray chamber by pipeline, the slurry in the concentration spray chamber is generated by flash unit flash steam, steam is heat source for heat exchange unit. The present application is provided with flash unit to the slurry in concentration spray chamber Heat recovery, steam generated by the steam is heat source for heat exchange unit, and condensate is generated by heat exchange unit, without breaking the original desulfurization tower in water balance, while improving the concentration of slurry in concentration spray chamber, it is conducive to extracting ammonium sulfate. The present application is provided with auxiliary spray unit can effectively prevent excess ammonia is taken away by flue gas and cause environmental pollution.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization technology, and in particular to a waste heat utilization system for vacuum concentration in ammonia desulfurization. Background Technology

[0002] In ammonia-based desulfurization processes, a large amount of slurry and flue gas containing waste heat is generated. Traditional systems often fail to effectively recover and utilize this waste heat, resulting in energy waste and increased system operating costs. Furthermore, in existing desulfurization tower structures, the concentration spray chamber may experience crystal accumulation during solution concentration, affecting media discharge efficiency. Ammonia escape also easily leads to air pollution, indicating insufficient environmental friendliness. Simultaneously, the collaborative working capacity of the various units within the system is limited, making it difficult to achieve efficient and unified desulfurization, solution concentration, and waste heat recovery. Therefore, there is an urgent need for an ammonia-based desulfurization waste heat utilization system that can improve energy utilization, reduce ammonia escape, and optimize system operational stability. Utility Model Content

[0003] Purpose of the utility model: To provide a vacuum concentration waste heat utilization system for ammonia desulfurization to solve the above-mentioned problems existing in the prior art.

[0004] Technical solution: A vacuum concentration waste heat utilization system for ammonia desulfurization includes: a desulfurization tower, which includes an adsorption spray chamber and a concentration spray chamber. An ammonia storage unit receives the slurry in the adsorption spray chamber and transports it back to the adsorption spray chamber through a pipeline. The slurry in the concentration spray chamber is flashed by a flash evaporation unit to generate exhaust steam, which provides a heat source for the heat exchange unit.

[0005] Furthermore, the flue gas enters the adsorption spray chamber after passing through the concentration spray chamber, and the adsorption spray chamber is selectively connected to the concentration spray chamber through the return liquid pipeline.

[0006] Furthermore, a circulating spray unit is provided on the concentrated spray chamber.

[0007] Furthermore, the circulating spray unit includes: a circulating pipeline, one end of which is connected to the bottom of the concentrated spray chamber, and the other end is connected to the spray head inside the circulating spray unit, and a circulating pump is provided on the circulating pipeline.

[0008] Furthermore, the other end of the circulation pipeline is connected to the flash evaporation unit.

[0009] Furthermore, the ammonia storage unit is equipped with an ammonia replenishment pipeline.

[0010] Furthermore, the ammonia storage unit is equipped with an oxidation gas inlet pipe and an oxidation gas exhaust pipe, and the ammonia storage unit is connected to the concentration spray chamber through the oxidation gas exhaust pipe.

[0011] Furthermore, it also includes a concentrated medium outlet connected to the concentrated spray chamber.

[0012] Furthermore, it also includes an auxiliary spray chamber to prevent ammonia escape. After the flue gas passes through the adsorption spray chamber, it enters the auxiliary spray chamber, and the auxiliary spray chamber is equipped with an auxiliary spray unit.

[0013] Furthermore, the auxiliary spray unit includes a water storage unit, which is connected to the nozzle and the bottom of the auxiliary spray chamber through connecting pipes. A circulation pump is installed on the connecting pipes, and a water replenishment pipe is installed on the water storage unit.

[0014] Beneficial effects:

[0015] This application utilizes a flash evaporation unit to recover heat from the slurry in the concentration spray chamber. The generated exhaust steam provides a heat source for the heat exchange unit, which in turn generates condensate. This process does not disrupt the water balance within the original desulfurization tower and simultaneously increases the concentration of the slurry in the concentration spray chamber, which is beneficial for the extraction of ammonium sulfate.

[0016] This application effectively prevents excess ammonia from being carried away by flue gas and causing environmental pollution by setting up an auxiliary spray unit. Attached Figure Description

[0017] Figure 1 This is a system diagram of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection of the circulating spray unit of this utility model.

[0019] The attached diagram is labeled as follows: desulfurization tower 100, adsorption spray chamber 110, concentration spray chamber 120, return liquid pipeline 130, auxiliary spray chamber 140, flash evaporation unit 200, heat exchange unit 300, ammonia storage unit 400, circulating spray unit 500, circulating pipeline 510, first circulating pump 520, ammonia replenishment pipeline 600, oxidant gas inlet pipeline 700, oxidant gas exhaust pipeline 800, concentrated medium outlet 900, auxiliary spray unit 1000, water storage unit 1010, connecting pipeline 1020, water replenishment pipeline 1030, and second circulating pump 1040. Detailed Implementation

[0020] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0021] Combined with appendixFigure 1 and Figure 2 Description: An ammonia-based desulfurization vacuum concentration waste heat utilization system includes a desulfurization tower 100, which comprises an adsorption spray chamber 110 and a concentration spray chamber 120. An ammonia storage unit 400 receives the slurry in the adsorption spray chamber 110 and transports it back to the adsorption spray chamber 110 through pipelines. The slurry in the concentration spray chamber 120 is flashed by a flash evaporation unit 200 to generate exhaust steam, which provides a heat source for a heat exchange unit 300. Flue gas enters the adsorption spray chamber 110 after passing through the concentration spray chamber 120. The adsorption spray chamber 110 is selectively connected to the concentration spray chamber 120 through a return liquid pipeline 130. A circulating spray unit 500 is installed on the concentration spray chamber 120. The circulating spray unit 500 includes: a circulating pipeline 510, one end of which is connected to the bottom of the concentrating spray chamber 120, and the other end of which is connected to a spray head inside the circulating spray unit 500. A circulating pump 520 is installed on the circulating pipeline 510. The other end of the circulating pipeline 510 is connected to the flash evaporation unit 200. An ammonia water storage unit 400 is provided with an ammonia water replenishment pipeline 600. An oxidation gas inlet pipeline 700 and an oxidation gas exhaust pipeline 800 are provided on the ammonia water storage unit 400, and the ammonia water storage unit 400 is connected to the concentrating spray chamber 120 through the oxidation gas exhaust pipeline 800. It also includes a concentrated medium outlet 900 connected to the concentrating spray chamber 120. It also includes an auxiliary spray chamber 140 to prevent ammonia escape. Flue gas enters the auxiliary spray chamber 140 after passing through the adsorption spray chamber 110. An auxiliary spray unit 1000 is installed on the auxiliary spray chamber 140. The auxiliary spray unit 1000 includes a water storage unit 1010, which is connected to the nozzles and bottom of the auxiliary spray chamber 140 via connecting pipes 1020. A circulation pump 1040 is installed on the connecting pipes 1020, and a water replenishment pipe 1030 is installed on the water storage unit 1010.

[0022] The desulfurization tower 100 includes a raw flue gas inlet pipe and a clean flue gas outlet pipe. The bottom of the auxiliary spray chamber 140 is equipped with a drain outlet for controlling the liquid level and concentration. The oxidizing gas exhaust pipe 800 transports unreacted gas from the ammonia storage unit 400 to the bottom of the concentration spray chamber 120 for further reaction and to prevent crystal accumulation in the concentration spray chamber 120, which would affect the media discharge efficiency. The flash evaporation unit 200 and the heat exchange unit 300 can be integrated or separate. The heat exchange unit 300 contains heat exchange tubes containing the medium to be heated. The heat exchange unit 300 also includes a cooling water outlet pipe and a vacuum pipe for evacuation. The flash evaporation unit 200 contains a demister. The return liquid pipe 130 controls the liquid level in the adsorption spray chamber 110 and is equipped with a valve. The ammonia storage... Unit 400 is connected to the adsorption spray chamber 110 via a pipeline, specifically to the nozzles within the adsorption spray chamber 110. A circulation pump is installed on the connecting pipeline for spraying ammonia water to perform ammonia desulfurization of the flue gas. The adsorption spray chamber 110 is the main desulfurization chamber for the flue gas. The main function of the concentration spray chamber 120 is to perform the first heat exchange after the dry flue gas is sprayed, turning the dry flue gas into saturated wet flue gas, thereby concentrating the solution in the concentration spray chamber 120. The main function of the auxiliary spray chamber 140 is to prevent excessive ammonia in the flue gas from being discharged into the atmosphere with the flue gas in the adsorption spray chamber 110. Ammonia is adsorbed by spraying water washing. When the concentration is too high, it is discharged through the drain outlet. At the same time, the water replenishment pipeline 1030 replenishes fresh water to ensure stable circulation. The medium in the ammonia water storage unit 400 is ammonium sulfite solution, which is oxidized by oxygen in the oxidizing gas inlet pipeline 700 to form ammonium sulfate.

[0023] The concentration spray chamber 120 of the desulfurization tower 100 in this application performs the first heat exchange on the flue gas, turning the dry flue gas into saturated wet flue gas while concentrating the solution in the chamber to increase the solution concentration. The adsorption spray chamber 110, as the main desulfurization chamber, works in conjunction with the ammonia storage unit 400 to deliver ammonia for desulfurization, thereby improving desulfurization efficiency. The flash evaporation unit 200 generates exhaust steam from the flash evaporation of the slurry, providing a heat source for the heat exchange unit 300, realizing waste heat recovery and utilization, and improving the system's energy utilization rate. The auxiliary spray chamber 140 uses the auxiliary spray unit 1000 to spray water and adsorb excess ammonia, preventing ammonia escape and atmospheric pollution, while maintaining stable circulation through the drain outlet and water supply pipeline 1030. The oxidizing gas inlet pipeline 700 oxidizes ammonium sulfite to ammonium sulfate, and the oxidizing gas exhaust pipeline 800 transports unreacted gas to the concentration spray chamber 120 to prevent crystal accumulation. The return liquid pipeline 130 controls the liquid level in the adsorption spray chamber 110. All units work together to improve system stability and environmental friendliness.

[0024] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A waste heat utilization system for vacuum concentration in ammonia desulfurization, characterized in that, include: The desulfurization tower (100) includes an adsorption spray chamber (110) and a concentration spray chamber (120). An ammonia storage unit (400) receives the slurry in the adsorption spray chamber (110) and transports it back to the adsorption spray chamber (110) through a pipeline. The slurry in the concentration spray chamber (120) is flashed by a flash evaporation unit (200) to generate exhaust steam, which provides a heat source for the heat exchange unit (300).

2. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, After passing through the concentration spray chamber (120), the flue gas enters the adsorption spray chamber (110), and the adsorption spray chamber (110) is selectively connected to the concentration spray chamber (120) through the return liquid pipeline (130).

3. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, The concentrated spray chamber (120) is equipped with a circulating spray unit (500).

4. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 3, characterized in that, The circulating spray unit (500) includes: a circulating pipeline (510), one end of which is connected to the bottom of the concentrated spray chamber (120), and the other end is connected to the nozzle inside the circulating spray unit (500). A circulating pump (520) is provided on the circulating pipeline (510).

5. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 4, characterized in that, The other end of the circulation pipeline (510) is connected to the flash evaporation unit (200).

6. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, The ammonia storage unit (400) is equipped with an ammonia replenishment pipeline (600).

7. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, The ammonia storage unit (400) is provided with an oxidation gas inlet pipe (700) and an oxidation gas exhaust pipe (800), and the ammonia storage unit (400) is connected to the concentration spray chamber (120) through the oxidation gas exhaust pipe (800).

8. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, It also includes a concentrated medium outlet (900) connected to the concentrated spray chamber (120).

9. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 1, characterized in that, It also includes an auxiliary spray chamber (140) to prevent ammonia escape. After the flue gas passes through the adsorption spray chamber (110), it enters the auxiliary spray chamber (140). An auxiliary spray unit (1000) is provided on the auxiliary spray chamber (140).

10. The ammonia desulfurization vacuum concentration waste heat utilization system according to claim 9, characterized in that, The auxiliary spray unit (1000) includes a water storage unit (1010), which is connected to the nozzle and bottom of the auxiliary spray chamber (140) through a connecting pipe (1020). A circulation pump (1040) is provided on the connecting pipe (1020), and a water replenishment pipe (1030) is provided on the water storage unit (1010).

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