Dust remover used in production process of fumed silica

Abstract

The utility model provides a dust remover used in fumed silica production process, which comprises a dust collecting hopper and an upper box body arranged above the dust collecting hopper, a gas purifying chamber and a filter chamber are arranged in the upper box body from top to bottom, the bottom of the gas purifying chamber is connected with the filter chamber through a perforated plate, a titanium alloy bag cage is arranged in the filter chamber, and the titanium alloy bag cage is connected with the filter chamber through a perforated plate. A plurality of rows of filter bags are arranged outside the titanium alloy bag cage, a pulse-jet ash removal device and an electric control box are mounted on the filter chamber, a gas source of the pulse-jet ash removal device adopts compressed nitrogen, the electric control box is in control connection with the pulse-jet ash removal device, and ash removal is performed on the plurality of rows of filter bags through the compressed nitrogen. The titanium alloy bag cage disclosed by the utility model has the advantages of low cost, high temperature resistance, corrosion resistance and the like, nitrogen is an inactive gas and is not easy to chemically react with an acid gas, and dust is cleaned on line by adopting pulse line by line through compressed nitrogen, so that the dust cleaning efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, and particularly relates to a dust remover used in the production process of fumed silica. Background Technique

[0002] The production process of fumed silica mainly generates silica particles through the high-temperature hydrolysis reaction of chlorosilane under the condition of a hydrogen-oxygen flame, and then is rapidly cooled. The particles are obtained through processes such as aggregation, separation, and deacidification, and the product purity is as high as over 99.8%. There are relatively high technical requirements for the raw materials, production equipment, production process, tail gas removal, packaging process, and surface treatment of the product of fumed silica. Fumed silica is an amorphous nanoscale powder material with primary particles of 7 - 40 nm and aggregates of 100 - 500 nm. Its specific surface area, pH value, particle size, surface chemistry, etc. all affect the quality and performance of the product. In the production process, precise control and adjustment are required for each variable such as particle generation, aggregation, and separation, and relatively complex process technology control capabilities are needed to produce high-quality products.

[0003] The bag filters on the market are difficult to handle the treatment of strongly corrosive gases involving high temperature and hydrochloric acid in the tail gas during use, thus affecting the process stability. Content of the Utility Model

[0004] To solve the above problems, the utility model aims to provide a dust remover used in the production process of fumed silica, which can withstand high temperature and acid corrosion during the dust removal process and does not affect the process stability.

[0005] To achieve the above purpose, the technical solution of the utility model is realized as follows:

[0006] A dust remover used in the production process of fumed silica includes an ash collection hopper and an upper box body installed above the ash collection hopper. A clean gas chamber and a filtration chamber are arranged in the upper box body from top to bottom. The bottom of the clean gas chamber is connected to the filtration chamber through a perforated plate. A titanium alloy bag cage is installed in the filtration chamber, and multiple rows of filter bags are arranged outside the titanium alloy bag cage. A pulse jet cleaning device and an electrical control box are installed on the filtration chamber. The gas source of the pulse jet cleaning device uses compressed nitrogen, and the electrical control box is connected to control the pulse jet cleaning device to clean the multiple rows of filter bags through compressed nitrogen.

[0007] Further, the surface of the filter bag is covered with PTFE needle felt + PTFE film.

[0008] Further, the electromagnetic pulse valve of the pulse jet cleaning device is placed on the side of the clean gas chamber of the upper box body, with one end connected to the gas source and the other end connected to the spray pipe.

[0009] Further, there is a maintenance door on the clean gas chamber.

[0010] Further, a pressure sensor and a temperature sensor are installed on the purification chamber, and the pressure sensor and the temperature sensor are connected to an electrical control box for control.

[0011] Further, an air flow distribution device is arranged in the ash hopper.

[0012] Further, an observation mirror is also arranged on the ash hopper.

[0013] Further, an air inlet is arranged on one side of the ash hopper, and an air outlet is arranged on the other side of the clean gas chamber.

[0014] Beneficial effects: The titanium alloy cage of the present utility model has the advantages of low cost, high temperature resistance and corrosion resistance, etc. Nitrogen is an inert gas and is not easy to chemically react with acidic gases. Pulse-by-pulse online cleaning is carried out by compressed nitrogen for ash cleaning, and the ash cleaning efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0016] Figure 1 is the front view of the dust collector in the production process of fumed silica according to the embodiment of the present utility model;

[0017] Figure 2 is the side view of the dust collector in the production process of fumed silica according to the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0019] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] Embodiment 1

[0021] See Figure 1-2:A dust collector used in the production process of fumed silica, including an ash collection hopper 1 and an upper box body 2 installed above the ash collection hopper 1. A clean gas chamber 201 and a filtration chamber 202 are arranged in the upper box body 2 from top to bottom. The bottom of the clean gas chamber 201 is connected to the filtration chamber 202 through a perforated plate. A titanium alloy cage 2021 is installed in the filtration chamber 202, and multiple rows of filter bags are arranged outside the titanium alloy cage 2021. A pulse jet cleaning device 3 and an electrical control box 4 are installed on the filtration chamber 202. The gas source of the pulse jet cleaning device 3 is compressed nitrogen, and the electrical control box 4 is connected to the pulse jet cleaning device 3 for control to clean the multiple rows of filter bags through compressed nitrogen.

[0022] The titanium alloy cage in this embodiment has the advantages of low cost, high temperature resistance and corrosion resistance. Nitrogen is an inert gas and is not easy to chemically react with acidic gases. The cleaning is carried out by pulse-by-pulse online cleaning through compressed nitrogen, and the cleaning efficiency is high.

[0023] In a specific example, the surface of the filter bag is covered with PTFE needle felt + PTFE film.

[0024] In this embodiment, the PTFE needle felt + PTFE film can separate the main product of the nanoscale silica process from the gas.

[0025] In a specific example, the electromagnetic pulse valve of the pulse jet cleaning device 3 is placed on the side of the clean gas chamber of the upper box body 2, with one end connected to the gas source and the other end connected to the blowing pipe.

[0026] It should be noted that the signal of the PLC microcomputer in the electrical control box is connected to the electromagnetic pulse valve; the electromagnetic pulse valve is connected in series with the compressed nitrogen 0.5 - 0.6 MPA gas source. When there is no signal input to the electrical control box, the air port of the electromagnetic pulse valve is sealed, and the pulse valve is in the closed state; when the electrical control box sends a signal, the control valve opens the pulse valve, and the compressed nitrogen enters the filter bag through the nozzle of the blowing pipe from the air bag for cleaning operation.

[0027] In a specific example, there is a maintenance door 2011 on the clean gas chamber 201.

[0028] In this embodiment, the porous plate and the filter bag inside can be replaced through the maintenance door.

[0029] In a specific example, a pressure sensor 5 and a temperature sensor 6 are installed on the purification chamber 201, and the pressure sensor 5 and the temperature sensor 6 are connected to the electrical control box 4 for control.

[0030] When the pressure sensor and the temperature sensor in the dust collector detect abnormal pressure and temperature, the electrical control box will drive the PLC microcomputer to control the pressure alarm and the temperature alarm to alarm.

[0031] In a specific example, an air flow distribution device 101 is provided in the ash hopper 1.

[0032] In this embodiment, the air flow distribution device equalizes the air flow entering the dust collector, thereby improving the dust removal effect.

[0033] In a specific example, an observation mirror 102 is further provided on the ash hopper 1.

[0034] In this embodiment, the dust state in the ash hopper can be conveniently observed at any time through the observation mirror, facilitating timely treatment.

[0035] In a specific example, an air inlet 103 is provided on one side of the ash hopper 1, and an air outlet 2012 is provided on the other side of the clean gas chamber 201.

[0036] The acidic gas at the air outlet of this embodiment can be recycled or used for acid production to achieve reuse.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dust collector used in the production process of fumed silicon dioxide, characterized in that: The invention comprises an ash collecting hopper (1) and an upper box body (2) installed above the ash collecting hopper (1); a clean air chamber (201) and a filter chamber (202) are arranged in the upper box body (2) from top to bottom; the bottom of the clean air chamber (201) is connected to the filter chamber (202) via a porous plate; a titanium alloy bag cage (2021) is installed in the filter chamber (202); a plurality of rows of filter bags are arranged outside the titanium alloy bag cage (2021); a pulse jet cleaning device (3) and an electrical control box (4) are installed on the filter chamber (202); the air source of the pulse jet cleaning device (3) adopts compressed nitrogen; the electrical control box (4) is connected to the pulse jet cleaning device (3) for control, and the plurality of rows of filter bags are cleaned by compressed nitrogen.

2. The dust collector for the production process of fumed silicon dioxide according to claim 1, characterized in that: The surface of the filter bag is covered with PTFE needle felt + PTFE film.

3. The dust collector for the production process of fumed silicon dioxide according to claim 1, characterized in that: The electromagnetic pulse valve of the pulse jet cleaning device (3) is placed on the side of the clean air chamber of the upper box body (2), one end of which is connected to the air source and the other end of which is connected to the jet pipe.

4. The dust collector for the production process of fumed silicon dioxide according to claim 1, characterized in that: The clean air chamber (201) is provided with an inspection door (211).

5. The dust collector used in the production process of fumed silicon dioxide according to claim 1, characterized in that: A pressure sensor (5) and a temperature sensor (6) are installed on the clean air chamber (201), and the pressure sensor (5) and the temperature sensor (6) are control-connected to the electrical control box (4).

6. The dust collector for the production process of fumed silicon dioxide according to claim 1, characterized in that: An airflow distribution device (101) is provided in the ash collecting hopper (1).

7. The dust collector used in the production process of fumed silicon dioxide according to claim 1, characterized in that: The ash collecting hopper (1) is also provided with an observation mirror (102).

8. The dust collector used in the production process of fumed silicon dioxide according to claim 1, characterized in that: An air inlet (103) is provided on one side of the ash collecting hopper (1), and an air outlet (2012) is provided on the other side of the clean air chamber (201).

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