APU desalination system liquid alkali recycling device

Abstract

The utility model discloses a kind of APU desalination system liquid alkali recycling device, it is related to APU desalination technical field, including APU desalination system, filler cooling tower and denitration desulfurization combined tower, APU desalination system is equipped with dilute alkali discharge port, filler cooling tower is equipped with dilute alkali inlet one, denitration desulfurization combined tower is equipped with dilute alkali inlet two, dilute alkali discharge port of APU desalination system and dilute alkali inlet one of filler cooling tower are connected by first pipeline, first valve and second valve are installed on first pipeline, second pipeline is connected on the first pipeline between first valve and second valve, second pipeline other end is connected with dilute alkali inlet two of denitration desulfurization combined tower. By newly adding bypass pipeline and valve in pipeline, dilute alkali discharged by APU desalination system is entered into denitration desulfurization combined tower by bypass pipeline, for absorbing NO2 and N2O5 after being oxidized by ozone, simultaneously absorbing SO2 gas that desulfurization absorption tower escapes, so that dilute alkali discharged obtains secondary utilization.

Description

Technical Field

[0001] This utility model relates to the field of APU desalination technology, and in particular to a liquid alkali reuse device for an APU desalination system. Background Technology

[0002] An APU (Acid Purification Unit Demineralization System) is a purification device specifically designed for treating industrial waste acid (especially sulfuric acid), commonly found in industries such as metallurgy and chemicals (e.g., titanium dioxide production, steel pickling). Its core purpose is to remove metal ion impurities (such as Fe) from waste acid. 2 ⁺ / Fe 3 ⁺, Mg 2 ⁺, Al 3 (e.g., ⁺), to achieve acid recycling and utilization, reducing waste acid emissions and fresh acid consumption.

[0003] The APU desalination system uses ion exchange technology to purify waste acid containing metal ions. During the resin regeneration and washing steps, dilute alkaline wastewater is generated. Currently, during the operation of the APU desalination system, the dilute alkali discharged during the two steps of resin regeneration and residual alkali washing is directly discharged into the purification packing cooling tower. The dilute alkali entering the packing cooling tower makes the original dilute acid circulating liquid alkaline. The circulating spray in the upper tower absorbs sulfur dioxide and sulfur trioxide in the flue gas from the furnace, reducing the concentration of sulfur dioxide entering the desulfurization absorption tower and reducing the amount of acid produced to a certain extent. Utility Model Content

[0004] The purpose of this invention is to provide an APU desalination system liquid alkali reuse device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An APU desalination system liquid alkali reuse device includes an APU desalination system, a packed cooling tower, and a denitrification and desulfurization combined tower. The APU desalination system is provided with a dilute alkali discharge port, the packed cooling tower is provided with a dilute alkali inlet 1, and the denitrification and desulfurization combined tower is provided with a dilute alkali inlet 2. The dilute alkali discharge port of the APU desalination system and the dilute alkali inlet 1 of the packed cooling tower are connected by a first pipe. A first valve and a second valve are installed on the first pipe. A second pipe is connected to the first pipe between the first valve and the second valve. The other end of the second pipe is connected to the dilute alkali inlet 2 of the denitrification and desulfurization combined tower. A third valve is installed on the second pipe.

[0006] Preferably, the first valve is installed on the first pipe on the side near the dilute alkali discharge port of the APU desalination system.

[0007] Preferably, the second valve is installed on the first pipe on the side near the dilute alkali inlet of the packed cooling tower.

[0008] Preferably, the third valve is installed on the second pipeline on one side near the dilute alkali inlet of the denitrification and desulfurization combined tower.

[0009] Preferably, the first and second pipes are plastic-lined steel pipes (PP lining) or 316L stainless steel pipes that are resistant to corrosion by dilute alkalis and dilute acids.

[0010] Preferably, the first valve, the second valve, and the third valve are all electrically controlled valves.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adds a bypass pipe and valve to the pipeline. When the APU desalination system is running through the two steps of alkali solution regeneration and residual alkali solution washing, the dilute alkali discharged can enter the denitrification and desulfurization combined tower through the bypass pipe. It is used to absorb NO2 and N2O5 after being oxidized by ozone, and at the same time absorb SO2 gas that escapes from the desulfurization absorption tower in the denitrification and desulfurization combined tower, so that this part of the dilute alkali discharged from the APU desalination system can be reused.

[0012] 2. The amount of liquid alkali used in the denitrification and desulfurization combined tower was reduced, which lowered the operating costs of the workshop and resulted in a decrease in the cost per ton of sulfuric acid.

[0013] 3. The dilute alkali discharged from the APU desalination system goes directly into the denitrification and desulfurization combined tower, which shortens the pipeline route, reduces the risk of pipeline freezing in winter, and better ensures the stable operation of the system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure Labels 1. APU desalination system, 2. Packed cooling tower, 3. Denitrification and desulfurization combined tower, 4. First valve, 5. Second valve, 6. First pipeline, 7. Second pipeline, 8. Third valve. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] An APU desalination system liquid alkali reuse device includes an APU desalination system 1, a packed cooling tower 2, and a denitrification and desulfurization combined tower 3. The APU desalination system, the packed cooling tower, and the denitrification and desulfurization combined tower are all existing technologies, and their internal structures and principles will not be described in detail here.

[0018] The APU desalination system 1 is equipped with a dilute alkali discharge port, the packed cooling tower 2 is equipped with a dilute alkali inlet 1, and the denitrification and desulfurization combined tower 3 is equipped with a dilute alkali inlet 2. The dilute alkali discharge port of the APU desalination system 1 and the dilute alkali inlet 1 of the packed cooling tower 2 are connected by a first pipe 6. A first valve 4 and a second valve 5 are installed on the first pipe 6. A second pipe 7 is connected to the first pipe 6 between the first valve 4 and the second valve 5. The other end of the second pipe 7 is connected to the dilute alkali inlet 2 of the denitrification and desulfurization combined tower 3. A third valve 8 is installed on the second pipe 7.

[0019] The first valve 4 is installed on the first pipe 6 on the side near the dilute alkali discharge port of the APU desalination system 1. The second valve 5 is installed on the first pipe 6 on the side near the dilute alkali inlet 1 of the packed cooling tower 2. The third valve 8 is installed on the second pipe 7 on the side near the dilute alkali inlet 2 of the denitrification and desulfurization combined tower 3.

[0020] The first pipe 6 and the second pipe 7 are plastic-lined steel pipes (PP lining) or 316L stainless steel pipes that are resistant to dilute alkali and dilute acid corrosion; the first valve 4, the second valve 5 and the third valve 8 are all electrically controlled valves.

[0021] Working principle: The first valve 4 and the second valve 5 on the first pipeline 6 are kept closed, and the third valve 8 on the second pipeline 7 is kept open. When the APU desalination system 1 operates to the two steps of alkali solution regeneration and residual alkali solution washing, the first valve 4 is opened. The dilute alkali discharged from the dilute alkali discharge port of the APU desalination system 1 enters the denitrification and desulfurization combined tower 3 through the second pipeline 7, where it absorbs NO2 and N2O5 after being oxidized by ozone, and at the same time absorbs SO2 gas escaping from the desulfurization absorption tower, so that this part of the dilute alkali discharged from the APU desalination system 1 can be reused.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for reusing liquid alkali in an APU desalination system, characterized in that: The system includes an APU desalination system, a packed cooling tower, and a denitrification and desulfurization combined tower. The APU desalination system is equipped with a dilute alkali discharge port, the packed cooling tower is equipped with a dilute alkali inlet 1, and the denitrification and desulfurization combined tower is equipped with a dilute alkali inlet 2. The dilute alkali discharge port of the APU desalination system and the dilute alkali inlet 1 of the packed cooling tower are connected by a first pipe. A first valve and a second valve are installed on the first pipe. A second pipe is connected to the first pipe between the first valve and the second valve. The other end of the second pipe is connected to the dilute alkali inlet 2 of the denitrification and desulfurization combined tower. A third valve is installed on the second pipe.

2. The APU desalination system liquid alkali reuse device according to claim 1, characterized in that: The first valve is installed on the first pipe on the side near the dilute alkali discharge port of the APU desalination system.

3. The APU desalination system liquid alkali reuse device according to claim 1, characterized in that: The second valve is installed on the first pipe on the side near the dilute alkali inlet of the packed cooling tower.

4. The APU desalination system liquid alkali reuse device according to claim 1, characterized in that: The third valve is installed on the second pipeline on one side near the dilute alkali inlet of the denitrification and desulfurization combined tower.

5. The APU desalination system liquid alkali reuse device according to claim 1, characterized in that: The first and second pipes are plastic-lined steel pipes or 316L stainless steel pipes that are resistant to corrosion from dilute alkalis and dilute acids.

6. The APU desalination system liquid alkali reuse device according to claim 1, characterized in that: The first valve, the second valve, and the third valve are all electrically controlled valves.

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