CN108917074A - Large-scale aluminium electrolysis workshop entirety method of ventilation and its device - Google Patents

Abstract

The invention discloses an overall ventilation method and device for a large-scale aluminum electrolysis workshop. The heat emitted by the electrolytic cell of the aluminum electrolysis workshop, the thermal pressure effect of the emitted flue gas itself, and the influence of the outlet speed of the flue gas in the purification system are used, and the protruding part of the roof of the original electrolysis workshop is used. As the upper gas-collecting flue, the flue gas in the workshop is integrated and exhausted as a whole, changing unorganized emission into organized high-altitude emission, strengthening the diffusion of pollutants, and reducing the impact of environmental pollution around the factory area.

Description

Integral ventilation method and device for large-scale aluminum electrolysis plant

technical field

The invention relates to a method and a device for integral ventilation of a large-scale aluminum electrolysis plant, belonging to the technical field of integral ventilation of industrial plants.

technical background

The flue gas produced by the existing aluminum electrolytic cell is simply sealed through the cell cover plate, and is sucked into the purification system through the exhaust pipe of the electrolytic cell under the action of the exhaust fan. Since most of the new electrolytic cells adopt the electrolytic cell technology of more than 500KA, the equipment length is basically in Above 18 meters, during the smoke exhaust process of the electrolytic cell, the flue gas in the furnace is unevenly distributed, resulting in some flue gas from the aluminum outlet end of the electrolytic cell not being able to be effectively discharged into the flue gas purification system, especially in the electrolytic cell. When the tank cover is opened, the negative pressure of the furnace of the electrolytic cell is reduced, and a large amount of air enters the electrolytic cell from the slotted part.

The flue gas that escapes into the workshop rises to the top of the electrolysis workshop under the action of heat and pressure, and is discharged into the atmosphere through the skylight, forming fugitive emissions. Due to the large scale of new projects, generally more than 300kt/a, the total amount of unorganized emissions is relatively large, and the pollutant emissions are relatively concentrated. The diffusion of pollutants is objectively affected by the topography and landforms around the factory area. According to the latest environmental pollution simulation reality, it is difficult for most enterprises to completely diffuse the fugitive emissions, resulting in increased environmental load and environmental pressure in local areas, resulting in a reduction in the number of animal and plant species around the workshop. And grow slowly, causing great damage to the surrounding environment of the factory.

Contents of the invention

The purpose of the present invention is to provide an overall ventilation method and device for a large-scale aluminum electrolysis factory building, so as to enhance the diffusion of pollutants and reduce the environmental pollution impact around the factory area.

Technical scheme of the present invention is:

First of all, the present invention proposes an overall ventilation method for a large-scale aluminum electrolysis plant. The protruding part of the factory roof is used as the upper gas-collecting flue to exhaust the flue gas in the workshop as a whole, transforming unorganized emission into organized high-altitude emission, which is more conducive to gas diffusion and reduces the environmental pressure around the factory area.

Among them, the upper gas-collecting flue of the plant and the electrolysis plant are integrated. The flue gas emitted from the electrolysis workshop is collected through the upper gas-collecting flue, and then enters the integrated chimney through the side flue by thermal pressure and is discharged at high altitude; The flue gas is desulfurized and purified at the same time as dry purification.

Correspondingly, the present invention proposes an integral ventilation device for a large-scale aluminum electrolysis plant. The device is provided with an upper gas-collecting flue on the protruding part of the electrolysis plant roof. At the same time, an integrated chimney is provided between the two electrolysis plants. The middle section of the flue is connected to the integrated chimney through a section of side flue. A purification chimney is installed at the bottom of the integrated chimney, and a purification and desulfurization system is installed at the bottom of the integrated chimney and below the purification chimney. While performing dry purification of the aluminum electrolysis flue gas Carry out desulfurization and purification, improve the level of flue gas treatment in the system, and reduce pollutant emissions.

Wherein, the integrated chimney adopted in the present invention is a Venturi structure, and the height of the throat part is the height of the outlet of the purification chimney.

The invention utilizes the thermal pressure effect of the flue gas itself and the influence of the outlet speed of the flue gas in the purification system to exhaust the flue gas in the workshop as a whole through integrated suction, changing unorganized emission into organized high-altitude emission, strengthening the diffusion of pollutants, and reducing the factory area Pollution of the surrounding environment.

Description of drawings

Fig. 1 is a structural schematic diagram of the overall ventilation device of a large-scale aluminum electrolysis factory building of the present invention.

The marks in the drawings are: 1-upper gas-collecting flue, 2-side flue, 3-integrated chimney, 4-cleaning chimney, 5-purifying desulfurization system.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the design of the present invention includes the upper gas-collecting flue 1 of the plant, the middle section of the upper gas-collecting flue 1 is connected to the side flue 2, and the other section of the side flue 2 is connected to the integration in the middle of the two electrolysis plants. chimney3. It can be seen from the figure that the integrated chimney 3 collects the flue gas from the upper gas-collecting flue 1 of the two electrolysis plants through the side flue 2 .

During the specific implementation, the heat emitted by the electrolytic cell of the aluminum electrolysis plant, the hot pressure effect of the emitted flue gas itself, and the influence of the outlet speed of the flue gas from the purification system are used, and the protruding part of the original electrolysis plant roof is used as the upper gas-collecting flue 1. The flue gas is exhausted by integrated suction as a whole, changing unorganized emission into organized high-altitude emission. The upper gas-collecting flue 1 of the plant is integrated with the electrolysis plant. The flue gas emitted from the electrolysis workshop is collected through the upper gas-collecting flue 1 and then enters the integrated chimney 3 through the side flue 2 by heat and pressure for high-altitude discharge; the integrated chimney 3 There is a purification chimney 4 at the inner bottom, and a purification and desulfurization system 5 is installed at the bottom of the integrated chimney 3 and below the purification chimney 4, so that desulfurization and purification can be performed while performing dry purification of the aluminum electrolysis flue gas.

The above are only specific application examples of the present invention. The present invention also has other implementation modes. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (4)

1. An overall ventilation method for a large-scale aluminum electrolysis plant, characterized in that: utilizing the heat emitted by the electrolytic cell of the aluminum electrolysis plant, the thermal pressure effect of the distributed flue gas itself, and the influence of the outlet speed of the flue gas from the purification system, utilizing the protruding roof of the original electrolysis plant Part of it is used as the upper gas-collecting flue (1) to exhaust the flue gas in the workshop as a whole through integrated suction, changing unorganized emission into organized high-altitude emission. 2. The overall ventilation method for large-scale aluminum electrolysis plant according to claim 1, characterized in that: the upper gas-collecting flue (1) of the plant is integral with the electrolysis plant, and the flue gas emitted by the electrolysis workshop passes through the upper gas-collecting flue ( 1) After being collected, it enters into the integrated chimney (3) through the side flue (2) and discharges at a high altitude through thermal pressure; at the same time, it performs desulfurization purification while performing dry purification on the aluminum electrolysis flue gas. 3. A large-scale aluminum electrolysis plant overall ventilation device, characterized in that: an upper gas-collecting flue (1) is provided on the protruding part of the electrolysis plant roof, and an integrated chimney (3) is provided between the two electrolysis plants. The middle section of the gas-collecting flue (1) is connected to the integrated chimney (3) through a section of side flue (2), and the integrated chimney (3) is provided with a purification chimney (4) at the bottom of the integrated chimney (3). A purification and desulfurization system (5) is provided below the chimney (4). 4. The overall ventilation device for a large-scale aluminum electrolysis plant according to claim 2, characterized in that: the integrated chimney (3) is a Venturi structure, and the height of the throat part is the height of the outlet of the purification chimney (4).