A waste gas treatment device for silicone sealant production

Abstract

This utility model belongs to the technical field of chemical production equipment and discloses a waste gas treatment device for silicone sealant production. It includes suction hoods installed at various points on the production line, which are sequentially connected via pipes to a dust collector, an incinerator, a wet electrostatic precipitator, an alkaline scrubbing tower, an induced draft fan, and a chimney. The outlet of the dust collector is connected to the inlet of the incinerator, the outlet of the incinerator is connected to the inlet of the wet electrostatic precipitator, the outlet of the wet electrostatic precipitator is connected to the inlet of the alkaline scrubbing tower, the outlet of the alkaline scrubbing tower is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the inlet of the chimney. This utility model can treat the waste gas generated during silicone sealant production, ensuring environmental and personal safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of chemical production equipment, specifically relating to a waste gas treatment device for silicone sealant production. Background Technology

[0002] The production of silicone sealant uses polydimethylsiloxane as the main raw material, supplemented with crosslinking agents, fillers, plasticizers, coupling agents, and catalysts, mixed under vacuum. Although sealed equipment is used as much as possible during the production process, waste gas is inevitably generated. This waste gas mainly consists of methanol vapor generated during the curing process (including white oil vapor generated under vacuum during high-temperature dehydration), as well as some volatile organic compounds (VOCs), mainly including hydrocarbons, halogenated hydrocarbons, oxygenated hydrocarbons, and nitrogenous hydrocarbons, specifically benzene series compounds, organochlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids, and petroleum hydrocarbon compounds, as well as silane coupling agent decomposition products (such as Si-CH3), dust (fillers or powder raw materials), and a small amount of acidic gases (such as HCl). If these waste gases are not centrally treated, they will cause serious harm to the environment and human health, because most of these waste gases are flammable and explosive, and reaching a certain concentration will cause safety hazards. Moreover, many are carcinogenic substances that can damage the liver, kidneys, brain, and nervous system. Therefore, they must be treated to ensure environmental and personal safety. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a waste gas treatment device for the production of silicone sealant, which can treat the waste gas generated in the production of silicone sealant and ensure environmental and personal safety.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A waste gas treatment device for silicone sealant production includes suction hoods installed at various points on the production line. The suction hoods are connected in sequence to a dust collector, an incinerator, a wet electrostatic precipitator, an alkaline scrubbing tower, an induced draft fan, and a chimney via pipes. The outlet of the dust collector is connected to the inlet of the incinerator, the outlet of the incinerator is connected to the inlet of the wet electrostatic precipitator, the outlet of the wet electrostatic precipitator is connected to the inlet of the alkaline scrubbing tower, the outlet of the alkaline scrubbing tower is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the inlet of the chimney.

[0006] Preferably, the dust collector is a cyclone bag filter. It primarily removes dust (packing material or powder raw materials) from the exhaust gas. A dust collection device is installed at the bottom of the cyclone dust collector to collect the dust for further processing.

[0007] Preferably, the incinerator is an RTO incinerator, which is equipped with a blower and a heat exchanger.

[0008] Preferably, the alkali washing tower is also connected to an alkali storage tank and a recovery liquid storage tank via pumps and pipelines.

[0009] Furthermore, the recovered liquid storage tank is reconnected to the alkaline scrubbing tower via a circulation pump. Spraying is achieved by recycling the alkaline solution. When the recovered liquid reacts with the waste gas for a certain period and the salt concentration in the recovered liquid reaches a certain value, the alkaline solution needs to be replaced. At this point, circulation stops, and new alkaline solution is introduced from the alkaline solution storage tank for reaction, then another cycle begins.

[0010] Furthermore, the upper part of the inner cavity of the alkali washing tower is provided with a spraying device, which includes a spray liquid input pipe and a square grid-shaped spray pipe connected to the spray liquid input pipe. The spray pipe is composed of five horizontal pipes and five vertical pipes arranged in parallel and intersecting each other. All the connections between the horizontal pipes and the vertical pipes are provided with downward spraying spiral nozzles.

[0011] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] This invention first separates the dust from the exhaust gas using a dust collector, then incinerates it in an incinerator to oxidize the combustibles in the exhaust gas at high temperature. The sintered particles are then separated in a wet electrostatic precipitator (which collects particulate matter, mainly silica particles). The remaining exhaust gas still contains acidic components, which are removed by an alkaline scrubbing tower. The resulting exhaust gas has a low content of various harmful substances, meeting emission standards, and is then transported to a chimney for discharge by an induced draft fan (which simultaneously provides negative pressure to the preceding process).

[0013] Therefore, this invention can treat the waste gas generated during the production of silicone sealant, ensuring environmental and personal safety. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0015] Among them, 1. suction hood; 2. dust collector; 3. incinerator; 4. wet electrostatic precipitator; 5. alkaline scrubbing tower; 6. induced draft fan; 7. chimney. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1As shown, a waste gas treatment device for silicone sealant production includes suction hoods 1 installed at various points on the production line. The suction hoods 1 are connected sequentially to a dust collector 2, an incinerator 3, a wet electrostatic precipitator 4, an alkaline scrubbing tower 5, an induced draft fan 6, and a chimney 7 via pipes (not shown). The outlet of the dust collector 2 is connected to the inlet of the incinerator 3, the outlet of the incinerator 3 is connected to the inlet of the wet electrostatic precipitator 4, the outlet of the wet electrostatic precipitator 4 is connected to the inlet of the alkaline scrubbing tower 5, the outlet of the alkaline scrubbing tower 5 is connected to the inlet of the induced draft fan 6, and the outlet of the induced draft fan 6 is connected to the inlet of the chimney 7.

[0018] In actual production, the negative pressure created by the induced draft fan 6 throughout the entire processing unit draws the waste gas generated during production into the dust collector 2 via the suction hoods 1 at various points on the production line. The dust collector 2 removes dust from the waste gas, which is then introduced into the incinerator 3 for combustion, allowing the organic waste gas to undergo high-temperature (above 900℃) oxidation. However, because silicone waste gas easily generates SiO2, the oxidized waste gas is cooled by the cooling system of the incinerator 3 before entering the wet electrostatic precipitator 4 to remove SiO2 particles. However, the acidic components (mainly hydrochloric acid) in the waste gas are not yet treated, so the waste gas is introduced into the alkaline scrubbing tower 5 for further treatment. The resulting gas contains ≤120mg / m³ of non-methane total hydrocarbons (NMHC). 3 Particulate matter: ≤30mg / m³ 3 HCl: ≤50mg / m³ 3 If the emission standards are fully met, emissions can be emitted through chimney 7.

[0019] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A waste gas treatment device for silicone sealant production, characterized in that: The system includes suction hoods installed at various points along the production line. These suction hoods are connected sequentially to a dust collector, an incinerator, a wet electrostatic precipitator, an alkaline scrubbing tower, an induced draft fan, and a chimney via pipes. The outlet of the dust collector is connected to the inlet of the incinerator, the outlet of the incinerator is connected to the inlet of the wet electrostatic precipitator, the outlet of the wet electrostatic precipitator is connected to the inlet of the alkaline scrubbing tower, the outlet of the alkaline scrubbing tower is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the inlet of the chimney.

2. The waste gas treatment device for silicone sealant production as described in claim 1, characterized in that: The dust collector is a cyclone bag filter.

3. The waste gas treatment device for silicone sealant production as described in claim 1, characterized in that: The incinerator is an RTO incinerator, which is equipped with a blower and a heat exchanger.

4. The waste gas treatment device for silicone sealant production as described in claim 1, characterized in that: The alkaline washing tower is also connected to an alkaline solution storage tank and a recovery solution storage tank via pumps and pipelines.

5. The waste gas treatment device for silicone sealant production as described in claim 4, characterized in that: The recovered liquid storage tank is reconnected to the alkaline washing tower via a circulation pump.

6. The waste gas treatment device for silicone sealant production as described in claim 1, characterized in that: The upper part of the inner cavity of the alkali washing tower is equipped with a spray device.

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