RU2419478C1 - Combined electric filter - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to leaning gas of dust and may be sued in heat engineering, metallurgy, production of construction materials etc. Combined electric filter consists of bag filter and electric filter fields arranged in one case. Case face is closed by bag plate. The latter houses filtration elements are arranged towards gas flow. Besides, tube distributing compressed air for reclamation of bags are arranged horizontally. Regeneration device incorporates programmable controller that allows regeneration of filtration elements starting from top bags, while duration of pause between regeneration intervals exceeds time of dust deposition between adjacent bags.

EFFECT: optimum use of case volume, simplified mounting and better gas distribution in electric filter.

4 cl, 2 dwg

Description

The invention relates to the field of gas cleaning from dust and can be used in the power industry, metallurgy, building materials industry and other industries.

Known combined dust collecting apparatus, consisting of a filter and an electrostatic precipitator [patent No. 2248837]. A distinctive feature of this apparatus is that a fabric filter is installed sequentially behind the electrostatic precipitator with a ratio of active volumes of the filter to the electrostatic precipitator of 0.1-0.9, and the electrostatic precipitator and the filter are located in one or different cases. The disadvantage of this apparatus is the fact that when placing the filter in the housing of the electrostatic precipitator, a substantial alteration of the housing is required.

Closest to the proposed invention in terms of the technical nature of the problem and the set of common essential features is a combined dust collecting apparatus (prototype) manufactured by VNA. The devices manufactured by this company contain filter elements that, when placed in the housing of the electrostatic precipitator, "hang vertically." [VNA advertising brochure “Modernization of electrostatic precipitators by VNA, info-switzerland@bha.com.] This is a progressive solution, but it has the following disadvantages with the vertical arrangement of filter elements:

- the bag filter occupies the volume of more than one field of the electrostatic precipitator;

- the need to manufacture special devices for organizing the desired direction of movement of the purified gas in the filters;

- the complexity of the installation of the filtration apparatus;

- the need to change the direction of flow of the purified gas;

- deterioration of the gas distribution quality of the gas flow in the last field of the electrostatic precipitator.

The technical task of the invention and the technical result achieved by its solution are that the proposed horizontal placement of filter elements allows you to:

- rationally use the volume of the housing and fit into the dimensions of one field of the electrostatic precipitator.

- simplify the installation of the filter;

- leave unchanged the direction of the gases in the housing;

- improve gas distribution in the last field of the electrostatic precipitator.

The specified technical result is achieved by the fact that in the housing the end part of the electrostatic precipitator along the gas is closed by a sleeve plate, in which filter elements are installed with their bottoms facing the gas flow.

Thus, the moving cleaned dust and gas stream retains its original direction. The length of the sleeves can be made over the entire length of the field. With good regeneration of the sleeves, the entire volume of the field is filled.

In particular cases, some deviation of the direction of the dust and gas stream in the direction may be allowed, i.e. filter element bottoms can be installed at an angle to the flow, slightly different from 90 °. With a flat sleeve, bottoms may be absent.

Hose regeneration is performed by air pulses through distribution pipes. During the regeneration process, the dust removed from the sleeves falls down, so to prevent clogging of the regenerated sleeves with this dust, the distribution pipes are installed horizontally, and the bag filter regeneration device is equipped with a software controller that ensures the order of regeneration of filter elements, starting from the sleeves located on the top and sequentially to the sleeves located on the bottom . Moreover, the duration of the pause between regenerations is provided more than the time of dust falling from one row of arms to the next.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The possibility of carrying out the invention described by the above set of features, as well as the possibility of realizing the purpose of the invention can be confirmed by a description of a possible design of a device made in accordance with the invention, the essence of which is illustrated by graphic materials.

Figure 1 shows a sectional view of a combined electrostatic precipitator.

The designations of the elements in figure 1 are as follows:

1 - housing combined electrostatic precipitator;

2 - diffuser;

3 - field electrostatic precipitator;

4 - bottoms of filter elements;

5 - bag filter;

6 - filter elements;

7 - sleeve plate;

8 - hopper

Figure 2 shows the distribution pipes with the controller.

The designations in figure 2 are as follows:

9 - receiver;

10 - valves with electric control;

11 - distributing pipes;

12 - signal lines;

13 - software controller.

In Fig. 1, in the initial part of the housing of the combined electrostatic precipitator (1), the electrostatic precipitator fields (3) are located, equipped with a diffuser (2) at the gas inlet. Next in the housing is a bag filter (5) containing a bag plate (7), in which filter elements (6) with bottoms (4) are installed. Filter elements are oriented by bottoms towards the gas flow. Bins (8) are located under the casing to collect trapped dust.

The functioning of the combined electrostatic precipitator is as follows. The gas arriving for cleaning enters the housing (1) through the diffuser (2), where it is subjected to preliminary cleaning in the fields of the electrostatic precipitator (3). Next, the gas is cleaned in a bag filter (5), where it passes through the filter elements and is subjected to final cleaning from dust to the level of several grams of dust per 1 m ^{3 of} gas to be cleaned.

In figure 2, the distribution pipes (11) are located horizontally on two opposite sides of the filter elements between the receivers (9). Each distribution pipe has an electrically controlled valve (10) that receives power through the corresponding signal line (12). The regeneration of filter elements is carried out by supplying compressed air from the receivers (9) through electrically controlled valves (10) and distribution pipes (11).

Electrically controlled valves (2) are switched on by the program controller via signal lines (12). In this case, the program controller (13) ensures the order of regeneration of filter elements, starting from the sleeves located above and sequentially to the sleeves located below. Moreover, the duration of the pause between regenerations is longer than the time of dust fall from one row of arms to the next.

The present invention is industrially applicable, since its manufacture does not require special equipment and new technologies.

The design of a “combined electrostatic precipitator” described in this example and depicted in graphic material is not the only one possible to achieve the above technical result and does not exclude other variants of its manufacture containing a combination of features included in an independent claim.

Claims (4)

1. A combined electrostatic precipitator, including one or more fields of an electrostatic precipitator placed in one housing, and behind them along the gas flow a bag filter, characterized in that the end part in the housing is closed by a tubular plate in which filter elements are installed with bottoms facing the gas flow. 2. The combined electrostatic precipitator according to claim 1, characterized in that the distribution pipes of compressed air for the regeneration of the sleeves are installed horizontally. 3. The combined electrostatic precipitator according to claim 1, characterized in that the bag filter regeneration device is equipped with a program controller that ensures the order of regeneration of filter elements, starting from the sleeves located on the top and sequentially to the sleeves located on the bottom. 4. The combined electrostatic precipitator according to claim 3, characterized in that the pause duration between regenerations is longer than the time of dust falling from one row of arms to the next.

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