EA026622B1 - Dust precipitation chamber for cement dust recovery - Google Patents

Abstract

The invention relates to dust precipitation facilities and can be used in a construction materials industry in cement production. A cement precipitation structure comprises a horizontally-extended body 1, inside which a fiber filter 4 along its ends and along its upper and side walls is arranged. At the entrance the structure body is connected with a powder-gas pipeline 2, provided with a corona electrode device 5, wherein electrical cables with precipitation electrodes 7 are positioned in the bottom part of the structure body, beneath which receiving hoppers are mounted. The technical result of the invention provides enhancement of precipitation effectiveness of hot dust in cement production.

Description

The invention relates to dust collecting devices and can be used in the building materials industry in the manufacture of cement.

Known dust precipitation structure containing a rigid moisture-resistant casing and dusty air duct. It is equipped with a closed filter cloth shell, which is suspended on the inner walls of the housing and is connected to a dusty air pipe through a coagulation jet extinguishing device (KI 2156154, class Β01Ό 46/00, published on September 20, 1999).

The named dust collecting plant is intended for cleaning dust and air emissions from crushing and screening plants and processing plants, where during the processing of the material it does not heat up with the formation of carbon monoxide, therefore, the design of the known dust collecting plant for dust collection uses only a fabric bag filter, which is used to process finely dispersed material not enough.

Also known is a dust collecting apparatus for dry cleaning gases having a high concentration of fine dust. This apparatus contains a housing with a diffuser at the gas inlet and an electrostatic precipitator and precipitation and corona electrodes installed in it, as well as a fabric filter with filter elements. Both filters at the bottom have hoppers. The electrostatic electrodes and filter elements of the fabric filter are installed in the apparatus in a vertical plane along the gas stream. In addition, the apparatus has valve sections, as well as mud and clean gas manifolds (KI 2396128, class B03C 3/155, published on 08/10/2010).

This device has a number of significant disadvantages. This is due to the fact that two dust collectors with opposite aerodynamic characteristics are combined in tandem in it, as a result of which it only works with certain ratios (0.1-0.8) of the areas of the corona electrodes to the filter cloth elements. In case of violation of this ratio, the device dramatically loses its cleaning efficiency, and in some cases completely stops functioning.

The technical result of the invention is to increase the efficiency of trapping hot dust in the production of cement, provided that the stability of the proposed device.

The named technical result is achieved in the invention using the following set of features.

The dust-collecting plant contains a horizontal body, inside of which a fabric filter is located at its ends and along its upper and lateral sides. The building body at the inlet is connected to a dust and gas pipeline equipped with a corona electrode, and precipitation electrodes are located in the lower part of the body, under which receiving hoppers are installed.

Precipitation electrodes can be made in the form of electrical wires located along the housing.

The building body is equipped with a soothing partition and at the outlet it is connected to a gas collection chamber and an exhaust device.

The invention is illustrated in the drawing, where in FIG. 1 schematically depicts a dust settling structure (end view); in FIG. 2 is a section AA in FIG. one; in FIG. 3 is a section BB in FIG. one.

The deposition dust deposition plant for collecting cement dust shown in the drawing contains a rigid moisture-proof casing 1 connected to a pipe 2 for supplying a heated dust-gas mixture 3 inside a fabric filter 4 (Fig. 1, 2) fixed inside the casing 1. Pipeline 2 is equipped with a device 5 with a corona electrode . A soothing partition 6. is installed across the housing. Settling electrodes are located throughout the lower part of the housing 1, made, for example, in the form of electric wires 7 installed on insulators 8 located at the joints of the receiving hoppers 9 (Fig. 2, 3). The dust collecting structure has a gas collection chamber 10, a fan 11 and a chimney 12.

Dust precipitation works as follows.

The stream of the heated dust-gas mixture 3, passing through the pipeline 2, is in contact with the corona electrode of the device 5, made in the form of an ozonizer. As a result, carbon monoxide CO is oxidized to carbon dioxide CO ₂ , and the dust contained in it acquires a negative charge. When leaving the gas pipeline 2, the flow of structured gas mixture enters the fabric filter 4 and, having reached the soothing partition 6, bypasses it through the opening formed at the bottom.

Since the electric wires 7 have a constant positive charge, a stable electromagnetic field with a positive charge is created above the receiving bins 9, which attracts negatively charged dust particles. Reaching a critical mass, dust particles accumulated on the wires fall into the storage bins 9.

A dust-free gas containing CO2, passing through a fabric filter 4, enters the interbody 13 through which it moves towards the gas collection chamber 10, which has a negative pressure created by the fan 11. Then the dust-free gas is released into the atmosphere through the exhaust pipe 12.

Thus, the proposed dust settling structure allows efficiently precipitating cement dust due to the simultaneous use of several filtering devices, and the name is 1 026622 but fabric and electric filters.

Claims (4)

CLAIM 1. A dust precipitating structure containing a horizontally extended housing, inside of which, along its ends and along its top and sides, is a fabric filter, while the housing is connected to the dust and gas pipeline at the entrance, characterized in that the dust gas pipeline is equipped with a device with a corona electrode, and in the lower part of the body there are precipitation electrodes, under which the receiving bins are installed. 2. The construction according to claim 1, characterized in that the collecting electrodes are made in the form of electrical wires along the body. 3. The construction according to claim 1, characterized in that the housing at the outlet is connected to the gas collecting chamber and the exhaust device. 4. The construction according to claim 1, characterized in that the building is equipped with a soothing partition.