System for treating ammonium chloride white smoke

Abstract

The utility model relates to the field of waste gas recovery treatment, and discloses a system for treating ammonium chloride white smoke, which comprises an alkali liquor spraying device, an electrostatic dust collection device and a recovery pipeline, and the alkali liquor spraying device is communicated with the electrostatic dust collection device through the recovery pipeline. And the alkali liquor spraying device and the electrostatic dust collection device are sequentially arranged along the flowing direction of waste gas. Ammonium chloride particles in waste gas are recycled through the electrostatic dust collection device, and the recycling cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of waste gas recovery and treatment, in particular to a system for recovering and treating waste gas containing ammonium chloride, and in particular to a system for treating white smoke of ammonium chloride. Background Art

[0002] Ruthenium metal has a series of excellent properties such as high melting point, high temperature oxidation resistance, corrosion resistance, excellent conductivity, high catalytic activity, etc. The content of ruthenium in nature is relatively low, and it is difficult to extract. In the existing technology, ruthenium is mainly extracted by ammonium chloride precipitation. This method has a low utilization rate of ammonium chloride and limits production capacity. The waste gas generated in the calcination process includes unused ammonium chloride, which pollutes the environment.

[0003] CN102172458A discloses a method and equipment for treating tail gas containing ammonium chloride, and 3 , HCl, NH 4 The tail gas containing ammonium chloride is first heated to 400°C in the heating zone and then cooled and precipitated in the cooling zone. The cooling zone is divided into three areas, each with grooves.

[0004] The ammonium chloride tail gas is treated by heating it up first and then cooling it down. The tail gas needs to be heated to 400°C, which consumes a lot of energy. The ammonium chloride deposited in the grooves in the cooling zone requires manpower and material resources to collect, resulting in increased treatment costs. Utility Model Content

[0005] In view of the defects and shortcomings of the prior art, the utility model provides a system for processing white smoke of ammonium chloride.

[0006] A system for treating ammonium chloride white smoke comprises an alkali solution spraying device, an electrostatic dust removal device and a recovery pipeline. The alkali solution spraying device and the electrostatic dust removal device are connected through the recovery pipeline, and the alkali solution spraying device and the electrostatic dust removal device are arranged in sequence along the flow direction of the exhaust gas.

[0007] Preferably, the electrostatic precipitator comprises a dust collecting chamber, a dust collecting electrode and a discharge electrode, the dust collecting chamber is connected to the recovery pipe, and the dust collecting electrode and the discharge electrode are both arranged in the dust collecting chamber.

[0008] Preferably, a porous plate is further included, and the porous plate is arranged between the dust collecting chamber and the recovery pipe.

[0009] Preferably, a nozzle is provided at the top of the dust collecting chamber, and an ash hopper is provided at the bottom of the dust collecting chamber.

[0010] Preferably, the ash hopper is slidably connected to the dust collecting chamber.

[0011] Preferably, the alkali solution spraying device comprises at least one alkali solution spraying tower.

[0012] Further preferably, the alkali solution spraying device comprises two alkali solution spraying towers.

[0013] Preferably, it also includes a centrifugal fan, which is connected to the recovery pipe and is arranged downstream of the electrostatic precipitator.

[0014] Compared with the prior art, the utility model has the following obvious beneficial effects:

[0015] (1) An electrostatic dust removal device is set up to recover ammonium chloride in the exhaust gas. Compared with the method of heating first and then cooling in the prior art, it can reduce energy consumption, save recovery costs, and facilitate the promotion of recovery technology; the ammonium chloride particles entering the dust collecting chamber adhere to the surface of the dust collecting electrode, which is convenient for centralized collection;

[0016] (2) By setting up multiple spray towers, the acidic substances in the exhaust gas can be fully recovered to prevent the acidic substances from entering the electrostatic precipitator and damaging the electrostatic precipitator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the electrostatic precipitator in Example 1.

[0019] Explanation of reference numerals: 1. Alkali solution spraying device; 101. Alkali solution spraying tower; 2. Electrostatic dust removal device; 201. Dust collecting chamber; 202. Perforated plate; 203. Dust collecting electrode; 204. Discharge electrode; 205. Ash hopper; 206. Nozzle; 3. Recovery pipe; 4. Centrifugal fan. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, they will be described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited to the following specific embodiments.

[0021] Unless otherwise defined, all professional terms used below have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.

[0022] Embodiment 1:

[0023] A system for treating white smoke of ammonium chloride comprises an alkali solution spraying device 1, an electrostatic precipitator 2, a recovery pipe 3 and a centrifugal fan 4, wherein the head end of the recovery pipe 2 is connected to a device for producing waste gas in a workshop, and the end of the recovery pipe 3 is connected to a chimney for discharging waste gas in the workshop. The alkali solution spraying device 1, the electrostatic precipitator 2 and the centrifugal fan 4 are arranged in sequence along the flow direction of the waste gas, and the alkali solution spraying device 1, the electrostatic precipitator 2 and the centrifugal fan 4 are connected in sequence through the recovery pipe 3.

[0024] The alkali liquid spraying device 1 includes more than one alkali liquid spraying tower 101. Preferably, the alkali liquid spraying device 1 includes two alkali liquid spraying towers 101, and the two alkali liquid spraying towers 101 are connected in sequence through the recovery pipe 3. When purifying ruthenium, the production waste gas contains acidic substances. If one alkali liquid spraying tower 101 is set, the absorption rate of acidic substances in the waste gas is limited. If two alkali liquid spraying towers 101 are set, the absorption effect of acidic substances is increased to prevent a large amount of acidic substances from entering the electrostatic precipitator 2 and damaging the electrostatic precipitator 2. If more than three alkali liquid spraying towers 101 are set, on the one hand, the recycling cost will increase. On the other hand, after the waste gas is treated by the alkali liquid spraying tower 101 each time, some alkaline substances are taken out. If it passes through more than three alkali liquid spraying towers 101, it is easy to cause the alkaline substances in the waste gas to increase. After entering the electrostatic precipitator 2, it may still cause damage to the electrostatic precipitator 2.

[0025] The electrostatic precipitator 2 comprises a dust collecting chamber 201 , a porous plate 202 , a dust collecting electrode 203 , a discharge electrode 204 , an ash hopper 205 and a nozzle 206 . The dust collecting chamber 201 is connected to the recovery pipe 3 , and the porous plate 202 is arranged between the dust collecting chamber 201 and the recovery pipe 3 .

[0026] The dust collecting electrode 203 and the discharge electrode 204 are both arranged in the dust collecting chamber 201, the dust collecting electrode 203 is arranged around the inner wall of the dust collecting chamber 201, and the discharge electrode 204 is arranged in the central area of ​​the dust collecting chamber 201. The electrostatic dust removal device 2 is connected to an external power supply, the dust collecting electrode 203 is connected to the positive pole of the power supply, and the discharge electrode 204 is connected to the negative pole of the power supply. The nozzle 206 is arranged at the top of the dust collecting chamber 201, and the ash hopper 205 is arranged at the bottom of the dust collecting chamber 201, and the ash hopper 205 is slidably connected to the dust collecting chamber 201. In the embodiment of the present application, the ash hopper 205 is arranged in a pull-out type.

[0027] When the electrostatic precipitator 2 is working, the dust collecting electrode 203 and the discharge electrode 204 are started to form a high-voltage electric field. The high-voltage electric field charges the smoke and droplets in the exhaust gas to form charged particles, and the charged particles move toward the electrodes of opposite charges (i.e., positively charged particles move toward the discharge electrode 204, and negatively charged particles move toward the dust collecting electrode 203). After the charged particles reach the electrodes, they are discharged, so that the ammonium chloride particles form neutral dust and mist particles, which are deposited on the dust collecting electrode 203 or the discharge electrode 204. Then, the nozzle 206 is started to spray liquid toward the dust collecting electrode 203 and the discharge electrode 204. The liquid flushes the dust collecting electrode 203 and the discharge electrode 204, and flushes the ammonium chloride particles into the ash hopper 205.

[0028] The pore structure of the porous plate 202 makes the high voltage electric field formed more uniformly distributed, thereby improving the dust removal efficiency of the equipment. In practical applications, the pore size, porosity and thickness of the porous plate 202 can be adjusted according to different application requirements.

[0029] Preferably, a door can be hinged on any side of the dust collecting chamber 201. After the water flow flushes the dust collecting electrode, some ammonium chloride particles may adhere to the surface of the dust collecting electrode. The door is provided to facilitate the staff to clean the dust collecting electrode.

[0030] When recycling waste gas, the waste gas flows into the alkali liquid spray device through the recovery pipe, passes through two alkali liquid spray towers to absorb the acidic substances in the waste gas, and then enters the electrostatic dust removal device to deposit ammonium chloride particles. After that, other impurities in the waste gas are removed by a centrifugal fan, and the treated waste gas can be discharged through the chimney of the workshop.

[0031] The above embodiments are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope of the present invention according to the technical solution and concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A system for treating white smoke from ammonium chloride, characterized in that: The invention comprises an alkali liquid spraying device (1), an electrostatic precipitator (2) and a recovery pipe (3); the alkali liquid spraying device (1) and the electrostatic precipitator (2) are connected via the recovery pipe (3); the alkali liquid spraying device (1) and the electrostatic precipitator (2) are arranged in sequence along the flow direction of the exhaust gas; the electrostatic precipitator (2) comprises a dust collecting chamber (201), a dust collecting electrode (203) and a discharge electrode (204); the dust collecting chamber (201) is connected to the recovery pipe (3); the dust collecting electrode (203) and the discharge electrode (204) are both arranged in the dust collecting chamber (201).

2. The system for treating white smoke of ammonium chloride according to claim 1, characterized in that: It also comprises a porous plate (202), wherein the porous plate (202) is arranged between the dust collecting chamber (201) and the recovery pipe (3).

3. The system for treating white smoke of ammonium chloride according to claim 1, characterized in that: A nozzle (206) is provided at the top of the dust collecting chamber (201), and an ash hopper (205) is provided at the bottom of the dust collecting chamber (201).

4. The system for treating white smoke of ammonium chloride as claimed in claim 3, characterized in that: The ash hopper (205) is slidably connected to the dust collecting chamber (201).

5. The system for treating white smoke of ammonium chloride according to claim 1, characterized in that: The alkali solution spraying device (1) comprises one or more alkali solution spraying towers (101).

6. The system for treating white smoke of ammonium chloride according to claim 5, characterized in that: The alkali solution spraying device (1) comprises two alkali solution spraying towers (101).

7. The system for treating white smoke of ammonium chloride according to claim 1, characterized in that: It also includes a centrifugal fan (4), and the alkali solution spraying device (1), the electrostatic dust removal device (2) and the centrifugal fan (4) are connected in sequence through a recovery pipeline (3).

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