Corrosion-resistant fumed silica chlorine tail gas treatment device

Abstract

This invention provides a corrosion-resistant fumed silica chlorine tail gas treatment device, comprising a tower body divided into upper and lower chambers, a dual-circulation pump, and a liquid collection tank. Chlorine-containing tail gas is introduced from the bottom of the lower chamber and neutralized with liquid alkali to generate sodium hypochlorite; unreacted gas enters the upper chamber, undergoes deep purification by the spray liquid circulating in the liquid collection tank, and is then discharged. The inner wall of the tower body is coated with polytetrafluoroethylene for corrosion resistance, and the liquid collection tank is equipped with a level gauge to achieve closed-loop circulation. This device solves the problems of low sodium hypochlorite concentration and production downtime risks caused by corrosion of fiberglass materials and flawed circulation design in traditional equipment. Through corrosion protection optimization and zero-water replenishment circulation, it significantly improves by-product concentration and production stability.

Description

Technical Field

[0001] This utility model relates to the field of fumed silica production technology, specifically to a corrosion-resistant fumed silica chlorine tail gas treatment device. Background Technology

[0002] The production process of fumed silica involves the high-temperature hydrolysis of chlorosilanes in an oxyhydrogen flame at 1200-1500℃, producing silica and acidic gases. Subsequently, through cooling, aggregation, cyclone separation, deacidification, and drying, fumed silica is produced for packaging and sale. The acidic tail gas obtained from cyclone separation enters a hydrochloric acid unit, where, after dust removal and acid absorption, 31% concentrated hydrochloric acid is produced as a byproduct. Chlorine gas, after water washing, enters a tail gas treatment unit, where it is treated with alkali and then discharged at high altitude as a harmless byproduct, producing sodium hypochlorite. The chlorine tail gas treatment stage, a crucial part of this process, currently has several application shortcomings. Specifically, the fiberglass material of the upper tower is not resistant to liquid alkali corrosion, and the bottom annular groove is shallow, making continuous spray circulation without introducing production water impossible. This not only poses a safety hazard due to equipment corrosion but also reduces the concentration of the byproduct sodium hypochlorite by continuously introducing production water, thus adversely affecting production stability and economic efficiency. Utility Model Content

[0003] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a corrosion-resistant fumed silica chlorine tail gas treatment device, avoiding the risk of production shutdowns caused by equipment corrosion, and ensuring stable production operation while maintaining an increased concentration of by-products.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A corrosion-resistant fumed silica chlorine tail gas treatment device includes a tower body, a first circulating pump, a second circulating pump, and a sump tank. The tower body is internally divided into an upper tower chamber and a lower tower chamber. The tower body is equipped with a gas material inlet, a circulating pipeline inlet, a circulating pipeline outlet, a liquid material discharge port, a balance pipeline inlet, and a gas material outlet. The gas material inlet, circulating pipeline inlet, and circulating pipeline outlet are connected to the lower tower chamber. The liquid material discharge port, balance pipeline inlet, and gas material outlet are connected to the upper tower chamber. The circulating pipeline inlet is located below the lower tower chamber, and the circulating pipeline outlet is located above the lower tower chamber. The first circulating pump connects to the circulating pipeline inlet and the circulating pipeline outlet. A product discharge pipe is connected to the circulating pipeline inlet. The liquid material discharge port and balance pipeline inlet are located below the upper tower chamber, and the gas material outlet is located above the upper tower chamber. The liquid material discharge port and balance pipeline inlet are connected to the sump tank. One end of the second circulating pump is connected to the bottom of the sump tank, and the other end is connected to the upper part of the upper tower chamber.

[0006] Preferably, the inner wall of the tower body is provided with a polytetrafluoroethylene (PTFE) cladding.

[0007] Preferably, a level gauge is installed on the liquid collection tank.

[0008] Preferably, a partition plate is fixedly installed inside the tower body; the partition plate is horizontally installed in the middle of the tower body and fixedly connected to the tower body, and the interior of the tower body is divided into an upper tower chamber and a lower tower chamber by the partition plate.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] Compared to traditional fumed silica chlorine tail gas treatment devices, this device significantly enhances the corrosion resistance of the tower by adding a polytetrafluoroethylene coating to the inner wall of the tower and the inner wall of the circulation pipe. Simultaneously, a liquid collection tank is added to the upper tower outlet pipe, equipped with a liquid level metering and control system to ensure continuous circulation in the upper tower, effectively reducing the amount of production water entering the system and thus increasing the concentration of the byproduct sodium hypochlorite. This effectively prevents internal corrosion, avoids the risk of production shutdowns caused by equipment corrosion, and achieves stable production operation while ensuring the increased concentration of byproducts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] in:

[0013] 1. Gaseous material inlet; 2. Circulation pipeline inlet; 3. Circulation pipeline outlet; 4. Liquid collection tank; 5. Liquid material discharge port; 6. Balance pipeline inlet; 7. Gaseous material outlet. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figure 1As shown, a corrosion-resistant fumed silica chlorine tail gas treatment device includes a tower body, a first circulation pump, a second circulation pump, and a liquid collection tank 4. The tower body is internally divided into an upper tower chamber and a lower tower chamber. The tower body is equipped with a gas material inlet 1, a circulation pipeline inlet 2, a circulation pipeline outlet 3, a liquid material discharge port 5, a balance pipeline inlet 6, and a gas material outlet 7. The gas material inlet 1, circulation pipeline inlet 2, and circulation pipeline outlet 3 are connected to the lower tower chamber; the liquid material discharge port 5, balance pipeline inlet 6, and gas material outlet 7 are connected to the upper tower chamber. The upper and lower tower chambers are connected; the circulation pipeline inlet 2 is located below the lower tower chamber, and the circulation pipeline outlet 3 is located above the lower tower chamber; the first circulation pump connects the circulation pipeline inlet 2 and the circulation pipeline outlet 3; a product discharge pipeline is connected to the circulation pipeline inlet 2; the liquid phase material discharge port 5 and the balance pipeline inlet 6 are located below the upper tower chamber, and the gas phase material outlet 7 is located above the upper tower chamber; the liquid phase material discharge port 5 and the balance pipeline inlet 6 are connected to the liquid collection tank 4; one end of the second circulation pump is connected to the bottom of the liquid collection tank 4, and the other end is connected to the upper part of the upper tower chamber. Chlorine gas enters the lower tower chamber through the gas material inlet 1 and is neutralized by adding liquid alkali; liquid alkali is input into the lower tower chamber through the circulation pipeline inlet 2; sodium hypochlorite is collected through the product discharge pipeline; the bottom liquid in the upper tower chamber enters the liquid collection tank 4 through the liquid phase material discharge port 5, and is pumped to the upper part of the upper tower chamber by the second circulation pump for spray circulation, and the tail gas is discharged from the gas phase material outlet 7 after being rendered harmless.

[0016] In this embodiment, the inner wall of the tower body is provided with a polytetrafluoroethylene (PTFE) cladding.

[0017] In this embodiment, a level gauge is installed on the liquid collection tank 4.

[0018] In this embodiment, a partition plate is fixedly installed inside the tower body; the partition plate is horizontally installed in the middle of the tower body and fixedly connected to the tower body, and the interior of the tower body is divided into an upper tower chamber and a lower tower chamber by the partition plate.

[0019] Working principle

[0020] Gas processing flow:

[0021] Chlorine-containing tail gas enters the lower tower chamber from gaseous material inlet 1, where it undergoes a neutralization reaction with the circulating liquid alkali (entering through circulating pipeline inlet 2) to produce sodium hypochlorite product.

[0022] Sodium hypochlorite solution is extracted through the product discharge pipeline connected to inlet 2 of the circulation pipeline.

[0023] The unreacted exhaust gas rises and enters the upper tower chamber.

[0024] Upper tower chamber circulation system:

[0025] The bottom liquid at the bottom of the upper tower chamber flows into the liquid collection tank 4 through the liquid material discharge port 5, and is then pumped to the top of the upper tower chamber by the second circulation pump for spraying to further absorb residual chlorine gas.

[0026] The spray liquid circulates in a closed loop between the collection tank 4 and the upper tower chamber to prevent additional production water from entering the system and maintain the sodium hypochlorite concentration.

[0027] The purified exhaust gas is discharged at high altitude from the gas phase material outlet 7.

[0028] Corrosion-resistant design:

[0029] The inner wall of the tower is covered with a polytetrafluoroethylene coating to resist corrosion from liquid alkali.

[0030] The liquid collection tank 4 is equipped with a level gauge to accurately control the circulating liquid volume.

[0031] Structural design:

[0032] The tower is divided into upper and lower chambers by a horizontal partition plate. The lower chamber is for the main reaction, and the upper chamber is for deep purification.

[0033] The balancing pipeline inlet 6 ensures stable pressure.

Claims

1. A corrosion-resistant fumed silica chlorine tail gas treatment device, characterized in that, The tower includes a tower body, a first circulating pump, a second circulating pump, and a liquid collection tank (4); the tower body is divided into an upper tower chamber and a lower tower chamber; the tower body is equipped with a gas material inlet (1), a circulation pipeline inlet (2), a circulation pipeline outlet (3), a liquid material discharge port (5), a balance pipeline inlet (6), and a gas material outlet (7); the gas material inlet (1), the circulation pipeline inlet (2), and the circulation pipeline outlet (3) are connected to the lower tower chamber; the liquid material discharge port (5), the balance pipeline inlet (6), and the gas material outlet (7) are connected to the upper tower chamber; the circulation pipeline inlet (1), the circulation pipeline inlet (2), and the circulation pipeline outlet (3) are connected to the upper tower chamber; the circulation pipeline inlet (1), the circulation pipeline inlet (2), and the circulation pipeline outlet (3) are connected to the lower tower chamber; the circulation pipeline inlet (1), the circulation pipeline inlet (2), and the circulation pipeline outlet (3) are connected to the upper ... 2) Located below the lower tower chamber, the circulation pipeline outlet (3) is located above the lower tower chamber; the first circulation pump connects the circulation pipeline inlet (2) and the circulation pipeline outlet (3); the circulation pipeline inlet (2) is connected to a product discharge pipeline; the liquid material discharge port (5) and the balance pipeline inlet (6) are located below the upper tower chamber, and the gaseous material outlet (7) is located above the upper tower chamber; the liquid material discharge port (5) and the balance pipeline inlet (6) are connected to the liquid collection tank (4); one end of the second circulation pump is connected to the bottom of the liquid collection tank (4), and the other end is connected to the upper part of the upper tower chamber.

2. The corrosion-resistant fumed silica chlorine tail gas treatment device as described in claim 1, characterized in that, The inner wall of the tower is provided with a polytetrafluoroethylene (PTFE) cladding.

3. The corrosion-resistant fumed silica chlorine tail gas treatment device as described in claim 1, characterized in that, A level gauge is installed on the liquid collection tank (4).

4. The corrosion-resistant fumed silica chlorine tail gas treatment device as described in any one of claims 1 to 3, characterized in that, A partition plate is fixedly installed inside the tower body; the partition plate is horizontally installed in the middle of the tower body and fixedly connected to the tower body, and the interior of the tower body is divided into an upper tower chamber and a lower tower chamber by the partition plate.

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