RU2368425C1 - Louver ash catcher - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: in device louvers are arranged in the form of metal wall installed with inclination angle of 45° at electric insulators inside body and connected to source of high voltage current. Metal plates of louvers have shape of isosceles angles, length of which fully covers flue section. Shelves of angles are inclined at the angle of 60° to horizontal plane, edges of shelves are sharpened as "knife" and are connected to each other by means of contact-ionising woven steel wire mesh with cut ends of wires.

EFFECT: reduction of dust load at electric filters by means of previous cleaning of gas and dust flow in louver dust catchers, but with application of electric flow in them, which is taken from power supply source common with electric filter.

1 dwg

Description

The proposed device relates to industries that use all types of electrostatic precipitators to clean gas and dust emissions into the air.

Analogs of the claimed invention are schemes of louvered dust collectors described in the following sources:

- Sorokin N.S. Aspiration of machines and pneumatic transport in the textile industry. "Light industry", 1970, p. 158, fig. 122 and 123;

- Sukhareva A.I. Reduced air dust in glassworks. L .: Stroyizdat, Leningrad Department, 1976 (Fig. 24, p. 110);

- Lukin V.D., Kurochkina M.I. Purification of ventilation emissions in the chemical industry. - L .: Chemistry, 1980 (p. 36, Figs. 1-14 and 15).

Common in the designs of these devices is a housing with three holes (nozzles) and shutters, consisting of overlapping rows of parallel plates or rings with a gap of 2-3 mm, mounted conically along a stream of dusty gas. A common disadvantage of these analogues is the low degree of dust cleaning. To increase it, louvered dust collectors are used in conjunction with cyclones, which complicates and increases the cost of the cleaning process. In addition, the disadvantage of cyclones is the secondary ablation of dust, which is observed in the case of gas overload of the cyclone.

We chose the dust collector operation scheme shown in the book by A. I. Rodionov as a prototype. et al. Environmental protection technology. Textbook for high schools. M.: Chemistry, 1989, p. 32, Fig. 1-4 - louvered dust collector.

The louvred dust collector consists of a housing with openings for the entry of dusty gas, the outlet of the purified gas with fine dust, the removal of coarse coarse and medium-sized dust and shutters in the form of plates parallel to each other and overlapping each other, inclined to the incident flow of dusty gas and partially overlapping the cross section chimney.

The disadvantage of the prototype is that it does not capture solid aerosols with a size of less than 20 microns.

Aerosols with a size of less than 20 microns, as you know, are well captured by electric filters, which in practice are installed as the first stage of gas purification from ash, in connection with which they take on the bulk of the dust of the gas stream, they are overloaded during operation, while reducing quality of gas purification; they operate in an unstable mode; they often stop during operation to clean from trapped ash.

In this regard, the task arose to significantly reduce the dust load on the electrostatic precipitators by pre-cleaning the gas-dust flow in the louver dust collectors, but using (for this) electric current taken from the power source common with the electrostatic precipitator.

The essence of the invention lies in the fact that the blinds are made of steel isosceles corners, the shelves of which are placed at an angle of 60 ° to the horizontal plane to prevent sedimentation and accumulation of ash particles on them, are metallic interconnected, forming a wall installed with an inclination angle of 45 ° to the oncoming the flow of dusty gas, completely overlapping the cross section of the chimney, electrically isolated from the body and connected to the same source of electric current from which the corona electrodes of the electrostatic precipitator are powered, at In this case, the edges of the shelves of the corners are sharpened “under the knife”, and the space between the corners in the upper part is covered by a steel wire mesh metal-bonded to the corners, which also provides the process of ionization of both gas and non-trapped fine ash, charging it with the same sign of electricity as sharp edges of corners.

The drawing schematically shows a vertical section along the longitudinal axis of the louvered ash collector, which is a housing 1 with holes for the entry of dusty gas 2, the outlet of the purified gas with fine dust 3, the removal of captured coarse and medium dust 4, a louvered metal wall 5 mounted on insulators 6, located on the inner walls of the housing 1, and inclined towards the dusty gas stream at an angle of 45 °, consisting of a group of sections - blinds 7, made of steel isosceles corners 8, in length Completely overlapping the cross section of the chimney, the shelves are inclined at an angle of 60 ° to the horizontal plane, the shelf parts 8 are interconnected contact-ionizing braided steel wire mesh 9 cheroots wires, the edge flange 8 sharpened corners "under the knife"; the hole for the removal of captured coarse and medium-sized ash 4 is equipped with a soothing grid 10.

The ash collector works as follows. The louvered ash collector is placed in the chimney in the area between the furnace of the steam boiler and the electrostatic precipitator and is connected to a receiving hopper for receiving large and medium-sized ash.

The flue gas from the boiler furnace through the chimney is fed through the inlet 2 of the housing 1 to the louvered metal wall 5 of the ash collector, the ash particles hit the lower shelves of the steel equal-sided corners 8 and are thrown to the stilling grate 10, and through it into the silo for the coarse-grained and medium-grained ashes.

In this case, ash particles larger than 20 microns in size fall into the bunker and accumulate, and particles smaller than 20 microns together with the gas are displaced from the hopper loaded with ash and, together with the rest of the mass that did not fall into the bunker, pass through the louver wall 5 of the ash collector, where the ionization process takes place gas and fine dust under the influence of ions flowing from the pointed edges of the shelves of the steel corners 8 and the ends of the wires of the steel wicker mesh 9, due to which sufficiently ionized gas and fine particles already enter the electrostatic precipitator s ash particles have got an electric charge of the same sign as the discharge electrodes of the electrostatic precipitator, which improves the efficiency and reliability of the precipitator.

The proposed louvered ash collector has the advantage over the known ones that along with increasing the degree of cleaning coarse and medium-sized dust due to the design and location of the blinds, its use in the chimney in the area between the boiler furnace and the electrostatic precipitator eliminates the need to use an additional dust collector due to the fact that in the process ash collector entrained medium and coarse ash displaces flue gas with fine dust and sends them to the main stream frequently Normally the purified gas, which passes through the wall of the dust collector tambour where this gas together with the fine dust is ionized and enters the primary precipitator with electric charge of discharge electrodes of the electrostatic precipitator, which creates favorable conditions for improving its efficiency and stability.

Claims (1)

Louver ash collector, consisting of a housing with openings for entering a dusty basin, an outlet for purified gas with fine dust, removal of coarse coarse and medium fine dust and louvers in the form of plates parallel to each other and overlapping each other, inclined to the incident flow of dusty gas, characterized in that the blinds are made in the form of a metal wall mounted with an angle of inclination of 45 ° on electrical insulators inside the housing, and the metal plates of the blinds have the shape of isosceles corners, along the length of the chimney section completely overlapping, the corner shelves are inclined at an angle of 60 ° to the horizontal plane, the edges of the shelves are sharpened “under the knife”, and in the space between the corners are contact-ionizing woven steel wire mesh with cut ends of wires, metal-connected to the corners and connected to the same current source from which the corona electrodes of the electrostatic precipitator are fed, and the hole for the removal of coarse and medium-sized ash is equipped with a soothing grid.

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