SU1181717A1 - Method and apparatus for trapping dust from gases - Google Patents

Abstract

1. A method for collecting dusts from gases, including passing a dusty stream through unipolar zones of corona discharges of different polarity with charge neutralization on the precipitation element and exclusion of the return corona by mutual compensation of fields created by charges of different sign in sediment layers, differing in that, in order to increase the degree of purification of gases and simplify the process, the flowing stream is passed through adjacent unipolar zones of different polarity, separated by precipitating elements, with fields pi ayut sequentially. (LL-JL. Vut, i

Description

2. Method POP1, characterized in that the unipolar coronal discharge zones are permanently supplied with a constant current.

3, an electrostatic precipitator for trapping dust from gases, including a power source, a housing with a bunker, corona-carrying gears located in the housing, and precipitation elements differing in that, p. In order to increase the degree of gas purification, adjacent corona electrodes are connected to opposite terminals.

the power supply, and the precipitation elements are placed between these discharge electrodes.

4. The electric filter according to the item 3, which is based on the fact that the precipitating elements are made of dielectric.

5. The electrostatic precipitator according to the item 3, which is based on the fact that the precipitation elements are made of electrically conductive material and are fixed in the case to insulators.

The invention relates to a technology for separating the flows of gases and particles suspended in them in a corona field and can be used in districts of the national economy where dust collection is necessary, especially when trapping so-called high-lancers.

The purpose of the invention is to increase the degree of gas purification and simplify the process of trapping.

Fig. 1 shows a scheme for trapping dust and passing current through a dielectric precipitating element, in Fig. 2, an electrostatic precipitator, a transverse section; in FIG. 3-Volt. The discharge characteristics of the bits carried out by —the scheme shown in FIG.

In Figures 1 and 3, the following notation is adopted: unipolar corona discharge zones of different polarity 1 and 2, boundary of unipolar zones (precipitating element) 3, layers of sediments 4, coinciding current-voltage characteristics of 5 bits with a pure metal precipitating element 1i with an element in the form of two layers of synthetic knitted fabric of dense structure, 6-volt voltage-current characteristics with a metal element on which layers of nylon fabric are applied, 7-voltage current-voltage characteristics from beta-fabric elements.

For the implementation of the proposed method, a bipolar electrostatic precipitator containing gas-tight,

a housing 8 with a bunker 9, inside of which there are anti-pole coronation electrodes 10 and 11 (for example, three) and precipitating elements 3. Corona electrodes are connected to different polarity outputs of the high-voltage source 12, mounted on the insulators 13 on the insulator. Precipitating the elements are fixed between the anti-pole corona electrodes 10 and 11. They divide the discharge gaps of the bipolar crowns into unipolar zones 1 and 2, in which particles are charged and deposited. The precipitation elements 3 are made of a porous dielectric, for example, of fabric used for bag filters, or of metal. In the latter case, they are fixed on insulators in the housing.

The implementation of the proposed method is carried out as follows.

The dusty stream is passed through the adjacent unipolar zones of corona discharges of different polarity 1 and 2, which are separated by a precipitating element 3. The electric fields of the zones are fed with current sequentially, and their ionic streams are directed to both sides of the mentioned partition, which serves as a precipitating element. At the same time, the reverse corona (OC) on the precipitation element is eliminated by localizing mutual compensation and neutralizing the captured charges, which are carried out between the layers of sediments 4, across the boundary of the Jat. 31 These unipolar zones are obtained from the bipolar corona burning from electrodes 10 and 11 by separating its discharge gap with a precipitating element 3. They feed the zones from one (or several) power source 12, one of whose poles can be grounded. In this case, the precipitating element should not have a common point with the food chain. Different interface materials can be used to separate adjacent unipolar zones. It must satisfy the requirement of impermeability for discharge ions. At the same time, it should ensure the free exchange of electrons between the zones. Both electrically conductive materials (metals) and various types of dielectrics (film and textiles) satisfy these requirements. The latter should have low electrical strength, low voltage drop (compared to source voltage) and high polarizability. The first

13 174 and the second characteristic is necessary to reduce the potential barrier on the surfaces of the partition, from which its local spark micro-breaks begin, closing the circuit between the zones. The third characteristic is necessary to obtain a continuous floor (equipotentials without dips) on the surface, which makes even a porous partition, with a moderate cell size, impermeable to ions. In addition, the last characteristic is necessary for the dielectric septum to function as a drainless electrode (it attracts particles from the zones). Polymer and wool fabrics and knitted fabrics of dense structure, as well as non-woven materials (felt, etc.) have these properties. The method is carried out at the parameters of corona discharges and dust-gas flow (speed, temperature, dust, etc.) that are usual for electro-gas cleaning.

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Claims (5)

METHOD FOR COLLECTING DUSTS FROM GASES AND ELECTRIC FILTER FOR ITS IMPLEMENTATION. (57) 1. A method for collecting dust from gases, including passing a dusty stream through unipolar zones of corona discharges of different polarity with neutralizing charges on the precipitating element and eliminating the reverse corona of field compensation, of different signs in order to increase the degree of gas purification and simplify the process, dusty the flow is passed through adjacent unipolar zones of different polarity, separated by precipitation elements, while the fields of the zones are fed sequentially. by mutual charge co-created by the layers of deposits, and with c so that, c> 2. The method of pop. 1, characterized in that the unipolar zones of the corona discharges stationary supply DC. 3. An electrostatic precipitator for collecting dust from gases, including a power source, a housing with a hopper, corona electrodes and precipitation elements placed in the housing; characterized in that, c. In order to increase the degree of gas purification, adjacent corona electrodes are connected to opposite terminals of the power source, and precipitation elements are placed between these corona electrodes. 4. An electrostatic precipitator according to claim 3, wherein the precipitating elements are made of dielectric. 5. An electrostatic precipitator according to claim 3, wherein the precipitating elements are made of electrically conductive material and are fixed in the housing on insulators.