RU2303480C1 - Dust-gas emission treatment process - Google Patents

Abstract

FIELD: environmental protection processes.

SUBSTANCE: invention relates to environmental protection systems designed to detoxify industrial emissions of multiple-profile enterprises dealing with processing of all types of mineral raw materials and can be used for detoxifying emissions from metallurgical and chemical enterprises as well as those of heat-power complex. Process of invention comprises cooling and condensation of flue gases followed by withdrawal of condensate and treated gases. At the height of 2/3 chimney, flue gas is mixed with overheated (150-200°C) steam and cooling and condensation of steam-gas mixture are performed in atmosphere beyond the chimney. Condensate formed from air-drop flow is collected on trays on the area adjusting the basement of chimney.

EFFECT: reduced operation expenses on efficient purification of flue gas from solid and gaseous pollutants.

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Description

The invention relates to environmental engineering systems for the neutralization of industrial emissions of multidisciplinary enterprises for the processing of all types of mineral raw materials, and can be used for the neutralization of emissions of metallurgical and chemical enterprises, as well as enterprises of the heat and power complex.

A known method of condensing gas and dust emissions in contact condensers, followed by drainage, secondary heating in a heat exchanger, followed by removal into the atmosphere through chimneys, with the production of secondary mechanical energy, with deep heat recovery while reducing harmful emissions and cleaning them with irrigation solutions and heat recovery with the condensation of water vapor by injection into the chimney [application 2000131050, IPC ⁷ F02C 6/18, publ. 11/10/2002].

The disadvantage of this method is the need to use additional expensive equipment, reagents, a larger number of staff, which leads to high operating costs.

A known method of purification of flue gases with the simultaneous utilization of secondary thermal energy and trapped impurities by condensation of the liquid phase in a tubular heat exchanger and further cooling in the atmosphere with simultaneous countercurrent absorption of nitrogen and sulfur oxides in a film of recirculated condensate saturated with ozone and a separation droplet cleaning followed by acid cleaning the liquid fraction on an anion exchange filter [RF Patent No. 2186612, IPC ⁷ B01D 53/60, publ., 12/13/2000]. This method is adopted as a prototype.

The disadvantage of this method is the need to use additional expensive equipment, reagents, a larger number of staff, which leads to high operating costs.

The technical result, the solution of which the proposed method is directed, is to reduce operating costs for the efficient purification of flue gases from solid and gaseous pollutants.

The technical result is achieved by the fact that the proposed method for cleaning dust and gas emissions, which consists in cooling and condensing flue gases, removing condensate and purified flue gases, according to the invention, superheated steam with a temperature of 150 is introduced into the flue gases at a distance of 2/3 of the height of the chimney -200 ° C, and the cooling and condensation of the vapor-gas mixture is carried out in the atmosphere outside the chimney, then the condensate from the resulting airborne droplet is collected in pallets located on the territory, adjacent to the base of the chimney.

The method is illustrated in the drawing, which shows a scheme for cleaning dust and gas emissions, as follows.

Flue gases from the enterprise’s transit gas duct are sent to a smoke exhauster (not shown in the drawing), which organizes a dust and gas stream, then sent to the chimney 1. Hot water from the enterprise’s heat supply system and energy is supplied to the steam generator 2 to create a stream of superheated steam with specified parameters (temperature 150-200 ° C) to ensure condensation of the steam outside the chimney. The formed jet is fed into the reaction zone, located at a distance of 2/3 H from the base of the pipe, where H is the height of the pipe. When passing the dust and gas stream through the reaction zone, it is saturated with water vapor. When entering the atmosphere outside the chimney, the stream cools, forming an air-droplet mixture, from which condensate with pollutants precipitates into trays 3 located in the territory adjacent to the base of the chimney, and the cleaned air enters the atmosphere. Condensate accumulates on the territory of the source of emissions with its subsequent neutralization and separation of solid and liquid phases. Pallets 3 are located on the territory of the enterprise, taking into account the wind rose. The size and number of pallets is determined by the parameters of the pipe and emissions.

To ensure the operation of the steam generator 2, it is possible to use the heat of a part of the exhaust crude gases entering the chimney 1 by passing them through the steam generator.

The advantages of the proposed method is that it will allow you to effectively ensure the purification of flue gases, without resorting to the use of expensive gas-cleaning equipment. To ensure the operation of the steam generator, it is possible to use the secondary heat of part of the crude exhaust gases entering the chimney.

Claims (1)

A method for cleaning dust and gas emissions, which consists in cooling and condensing flue gases, discharging condensate and purified flue gases, characterized in that superheated steam with a temperature of 150-200 ° C is introduced into the flue gases at a distance 2/3 of the height of the chimney from its base cooling and condensation of the vapor-gas mixture is carried out in the atmosphere outside the chimney, then the condensate from the obtained air-drop stream is collected in pallets in the territory adjacent to the base of the chimney.