SU1530260A1 - Apparatus for electric cleaning of gas - Google Patents

Abstract

The invention relates to electric gas cleaning, can be used in electrostatic precipitators for gas cleaning of thermal power plants, metallurgical enterprises and building materials industry and allows to increase the service life of the electrostatic precipitator and reduce operating costs. The device for electrical gas cleaning is equipped with sensors 12–14 of droplet formation installed in the cross section of the gas stream in front of the electrodes of the fields 2–4 of the electrostatic precipitator. The outputs of the sensors 12-14 through the element OR 15 are connected to the fluid supply controller. 1 hp f-ly, 3 ill.

Description

one

(21) 4405607 / 23-26

(22) 02.29.88

(46) 12/23/89. Bul N 47

(71) All-Union Scientific Research Institute of Electric Power Industry

(72) A.M. Druinsky and L. D. Epstein (53) 66.012-53 (088.8)

(56) Aliyev G.M. Power units for electrostatic precipitators. - M .: Energoizdat, j1981, p. 4-8.

Experimental testing and implementation of TeMnepaTypfro-RjiamHoro flue gas conditioning in front of electrostatic precipitators at a 300 MW Ermakovskaya GRES unit. Report on research on the topic, 139 0.3.84-86. No. of state. registration 0184006698. Kazakh Institute of Eglergetics, Almaty, 1986.

(54) TREATMENT FOR ELECTRIC GAS CLEANING

(57) The invention relates to electric gas cleaning, can be used in electrostatic precipitators of gas cleaning of thermal power plants, metallurgical enterprises and building materials industry and allows to increase the service life of the electrostatic precipitator and reduce operating costs. The device for electrical gas cleaning is equipped with drop-forming sensors 12-14 installed in the cross section of the gas flow in front of the electrodes of the fields of the 2-4 electrostatic precipitator. The outputs of the sensors 12-14 through the element OR 15 are connected to the fluid supply controller. 1 hp f-ly, 3 ill.

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The invention relates to the field of electrical gas cleaning and can be used for gas cleaning at thermal power plants x 5 M eTan-smelters and in the industry of building materials,

The aim of the invention is to increase the service life of the electrostatic precipitator and reduce operating costs by preventing corrosive wear of the electrodes and the walls of the chamber.

Fig. 1 shows the block diagram of the device and section A-A; Fig. 2 shows a variant of the design of the active part of the drop-forming sensor; Fig. 3 is a block diagram of a drip sensor,

The device (FIG. 1) contains a chamber 1 inside which the floor of the corona and collecting electrodes is placed. Each field is electrically connected to its power supply unit 5-7, respectively. Flue 8. It connects the camera 1 with a wet conditioning unit, which includes nozzles 9 for liquid flow, a fluid supply pipe 10, and a regulator 1 1 for supplying a conditioner liquid, and, for the regulator, an electrically operated valve or valve can be used. In front of the first along the gas flow, the field of electrodes in the cross section of the chamber is equipped with drop-forming iZ-IA sensors, whose codes are connected to the input of the OR 15 element, and the output of this element is connected to the control regulator 11.

The active part 16 of the drip sensor (Fig. 2) includes an insulating frame frame 17 equipped with a confuser 18. Near the exit of the confuser are two conductive electrodes 19 and 20 with a gap between their close ends about 0.5 mm. At the opposite ends of the electrodes, lugs 21 and 22 with conductor 23 and 24 sunk into them, with the help of which the electrodes 19–20 (Fig. 3) are connected to the power supply 25, are fastened with nuts and con- ning nuts. A current sensor 26 is connected in series to the power circuit in the form of, for example, a current relay,

The device works as follows.

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Combustion products in the form of flue gas, containing solid suspended particles, forcibly (using smoke exhausters) move through the flue 8 and enter the chamber of 1 electrostatic precipitator, sequentially streaming the floor of 2-A electrodes. Between the corona and collecting electrodes of each field there is a high (on the order of 20-50 kV) voltage provided by the corresponding power units 5-7. The corona electrodes are injected, and electric charges are charged into the interelectrode space, which charge solid aerosol particles of the passing gas. Charged particles under the action of electrostatic field forces are transferred to the precipitation electrodes and deposited on them. The cleaned gas leaves chamber 1, having a small concentration (a few percent of the inlet) dust.

With an increase in the voltage and current of the electroplator pitann efd), the purity of gas purification increases (the output concentration decreases), but only until the known phenomenon of the reverse corona occurs, after which the current increase in the interelectrode space does not give a different effect ( Apart from the increased energy consumption, and in a number of cases, the gas cleaning efficiency is even reduced. Since the phenomenon of the return corona occurs with high-resistance dust having a temperature of 180-220 ° C, it can be eliminated by lowering this temperature In particular, by wet conditioning. Through nozzles 9, a liquid is injected into the flow of flue gas under pressure and is injected through a pressure pipe

10 through the feed controller 11.

In normal operation, the fluid is injected in a fine state. The size of its droplets is such that during the movement of gas in chamber 1, they manage to evaporate, taking away part of the heat from the mass of gas and thereby reducing its temperature to the required level of 120-160 ° C. In this mode, there is no signal at the output of the drop sensor and regulator

11 Filing is open.

During operation, changes in the conditioning conditions are possible, such as those caused by a decrease in the pressure of the fluid in the pipeline, wear of the nozzles 9, or clogging of them. In this case, instead of finely dispersed liquid spraying large coils are formed, which do not evaporate and settle on the surface of the electrodes. Being chemically active due to the content of acids, liquid that has hit the surface of electrodes can, under high temperature conditions, lead to very rapid corrosion destruction of the electrodes. In the proposed device, this process is prevented as follows. Through the confuser of the active part 16 of the drop-forming sensors, the gas stream with the liquid drops contained in it enters the space between the electrodes 19 and 20.

Moving past the ends of the electrode, a drop of liquid briefly bridges them. And since it is an electrolyte solution and has good conductivity, an electric current occurs in the circuit formed by electrodes 19 and 20, wires 23 and 24, power supply 25, and current sensor 26. The latter is triggered and through the element OR 15 sends a signal to the fluid supply controller 11. The regulator stops feeding the 7Fluid and the dropping process stops. At the same time, a sound or light signal may be given to stop the wet conditioning process to eliminate the causes of failure by service personnel.

To more reliably detect the formation of droplets, several sensors are installed at different points in the cross section of the gas flow. Since these sensors are connected to the fluid supply controller 11 through the element OR 15, a drop in one of them is enough to stop the wet conditioning process.

Claims (2)

1. An apparatus for electrical gas cleaning, comprising a chamber with fields of corona and collecting electrodes, connected by a gas duct to a wet conditioning unit, and a regulator for the conditioning fluid supply, characterized in that the circuit extends the service life of the electrostatic filter and reduces operating costs by preventing corrosive wear of electrodes and chamber walls, it additionally contains drop-forming sensors and an OR element, while drop-forming sensors are placed in the cross section of gas The water in the area between the first field of the electro ml and the wet conditioning unit and each of them consists of the active part and electrically connected to the power source and the current sensor, and the leads of the drop sensors through the OR element are connected to the control input of the conditioning fluid supply regulator.   2. The device of claim 1, about tl, which is because the active part of the drop-formation sensor is designed as a hollow insulating frame, on the walls of which electrodes are made of conductive material, with the first ends of the electrodes placed between them at a distance of 0 , 1-0.5 mm, their second ends are equipped with threaded connections for connecting a series electric circuit from a power source and a current sensor, and the frame is equipped with a confuser, the input of which is drawn in the direction of the incident noToi a gas, and the output to the gap between the first mi ends of the electrodes. Editor O. Yurkovetska Compiled by B. Dolotin Tehred A. Kravchuk Proofreader E. Lonchakova Order 7803/8 Circulation 498 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., A / 5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Thebes. I Subscription