Discharge electrode of electrostatic precipitator for treating diesel engine exhaust gas

Abstract

The invention provides a discharge electrode of an electrostatic precipitator for treating diesel engine exhaust gas, in which axial intervals (intervals along the flow direction of exhaust gas) of discharge electrodes are changed between the upstream sides and downstream sides of tubular collecting modules, whereby initial electrification of PM, peeling of PM, electrification after peeling, repeating of peeling electrification, etc., are performed easily, PM is reliably collected, and power consumption can be reduced while voltage applied to the electrodes is ensured. A discharge electrode ofa device for treating diesel engine exhaust gas having a multi-stage precipitation wall structure in which a plurality of tubular collecting modules comprising electrostatic precipitation parts are arranged along a tube-axial direction inside a main collecting tube, the discharge electrode characterized in that axial intervals (intervals along the flow direction of exhaust gas) of electrodes of the tubular collecting modules are arranged far apart on upstream sides of the collecting modules and close together on downstream sides, the upstream sides of the collecting modules are weak-average-field electrode parts, and the downstream sides are strong-average-field electrode parts.

Description

technical field [0001] The present invention relates to an electrical treatment technology for exhaust gas from diesel engines such as marine, power generation, and general industrial engines using corona discharge, and more specifically to exhaust gas treatment technology for diesel engines that discharge high-temperature exhaust gas using heavy oil as fuel Use the discharge electrode of the electric dust collection device. Background technique [0002] Diesel engines are widely used as power sources for various ships, generators, large-scale construction machinery, and various automobiles. However, it is well known that PM contained in the exhaust gas discharged from such diesel engines not only causes air pollution but also has harmful effects on human body. Extremely harmful substances, so the purification of its exhaust is extremely important. Therefore, many proposals have been made, such as improvement of the combustion method of the diesel engine, adoption of variou...

AI Technical Summary

Problems solved by technology

That is, for example in Figure 14 In the case of the shown discharge electrode needles, the discharge electrodes made of electrode needles 101-2b protruding radially on a common electrode rod 101-2a, the discharge electrodes shown in FIG. The main electrode (electrode rod) 101-2a of the main electrode (electrode rod) 101-2a is substantially the discharge electrode that isosceles triangular zigzag discharge plate 101-2c constitutes, and the discharge electrode shown in Fig. 15 (B) is arranged on a common main electrode (electrode In the flow direction of the exhaust gas, the discharge electrode 101-2d formed by integrally setting the serrated discharge plate portion (mountain portion) 101-2e on the rod) 101-2a with the substrate portion 101-2f is formed by the serrated discharge electrode 101-2d. The arrangement intervals are fixed (equal intervals), so the electric field at the tip of the discharge electrode of each collection module is substantially constant in the flow direction of the exhaust gas, and the collection status of PM hardly changes in the flow direction of the exhaust gas. In order to secure a high applied voltage to maintain the collection rate, a large current is required and the power consumption is significant

Also, even in Figure 14 , Figure 15 (A) and Figure 15 (B) shown in the outer circumference of the cylindrical discharge electrode holding cylinder 201-2A-1d, 201-3A-1d installed on the outer circumference of the main electrode, set to the prescribed The discharge electrode needles 201-2A-1c or the low-height zigzag discharge electrode plates 101-2d are arranged radially in a dense manner, and the intervals arranged in each flow direction of the exhaust gas are also fixed as above, so in this case , the electric field of the discharge electrode needles of each collection module or the front end of the low-height serrated discharge electrode is also roughly fixed in the flow direction of the exhaust gas, and the PM collection status hardly changes in the flow direction of the exhaust gas. The high applied voltage of the collection rate requires a large current, and the power consumption is significant

Therefore, both technologies have the following problems. In order to secure a high applied voltage for maintaining the collection rate over the entire length of each collection module, a large current is required, resulting in significant power consumption.

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