A method and device for purifying high-temperature dusty exhaust gas emission

Abstract

The invention provides a high-temperature dust-containing waste gas discharge purification method and device that can realize waste gas cooling, dust separation, formaldehyde and other organic matter separation, and efficiently separate dust and harmful gases in dust-containing waste gas. Gas hood collection; under the action of the first-stage centrifugal fan, the cyclone dust removal device is used to make the dust particles with a particle size of more than 100 μm be discharged from the bottom of the cyclone dust removal device; the high-temperature dust-containing gas discharged from the cyclone dust removal device is cooled and enters the gas-solid adsorption separation tower. The dust and organic waste gas with a particle size of less than 100 μm are washed, adsorbed and separated. The dust is discharged at the bottom of the tower after precipitation; the mixed solution containing organic waste gas enters the external buffer water tank from above the bottom of the gas-solid adsorption separation tower, and is purified by secondary precipitation. And the circulating solution obtained after dilution is transported by the spray pump to the nozzle in the gas-solid adsorption separation tower for spraying; the gas after gas-solid separation is discharged into the atmosphere under the action of the secondary centrifugal fan.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas treatment, and relates to a dust-containing waste gas discharge purification method and a device thereof during industrial production, in particular to a discharge of high-temperature dust-containing waste gas suitable for industrial production of wood-based panels such as fiberboards and particle boards. Cleaning method and device thereof. Background technique [0002] In the wood processing industry, the production process of wood-based panels such as fiberboard and particleboard involves a series of processes such as unit crushing, sizing, drying, hot pressing, sanding, and cutting of wood materials, which will simultaneously produce certain dust and formaldehyde. High temperature and dusty exhaust gas such as harmful gases are discharged. The particle size range of the dust particles is 0.001-500 μm. In addition to dust, due to the decomposition of wood extracts, the addition of...

AI Technical Summary

Problems solved by technology

However, a single technology is not ideal for the treatment of high-temperature dusty waste gas generated in the production process of wood-based panels.

For example, the bag dust removal device can effectively remove tiny particles, but it cannot handle gases such as VOCs, and the tiny particles are easy to stick to the bag during operation and cause blockage. Most cloth bag materials are easy to burn, and friction is easy to generate static electricity. When dealing with high-temperature gases, there are potential accidents such as combustion and explosion.

The cyclone dust removal device is a dust removal device designed by the action of dust inertia and gravity. It has a better dust removal effect on large particle dust, and a relatively poor dust removal effect on fine dust.

The electrostatic precipitator mainly uses a strong electric field to separate and adsorb the particles from the airflow under the action of the electric field force to achieve the purpose of purification. However, the electrostatic precipitator technology has certain requirements on the specific resistance of the dust, which cannot make all dusts obtain high purification efficiency. It is easy to form a voltage gradient and cause local breakdown and discharge, which has the disadvantages of high energy consumption and high failure rate, a large investment, complex equipment, high costs for transportation, installation and maintenance management

The spray water washing dedusting device mainly uses a spray tower to make the dust-containing gas and water in close contact, and relies on hydro-wet to separate and capture dust particles and harmful water-soluble gases in the gas, and can reduce the temperature of the exhaust gas, but the existing spray In the water washing dedusting technology, the spray water cannot be fully in contact with the dust-containing waste gas effectively, and the dust or gas cannot be recycled, which will cause secondary pollution of dust and washing liquid containing harmful chemical components, and high operating costs.

[0004] Therefore, it is difficult to effectively treat the high-temperature dust-containing waste gas including dust and harmful gases generated in the production process of wood-based panel industry, especially dry tail gas and hot-pressed tail gas, etc., through a single mechanism or device. Optimization and upgrade

Images