Exhaust gas processing device for diesel engine

Abstract

Provided is an exhaust gas purifying device for a diesel engine, such that the size of a cyclone can be reduced, and a high particulate matter (PM) collection rate and low fuel consumption can be achieved. This exhaust gas processing device for a diesel engine comprises: a tubular collection unit comprising a discharge electrode for electrically charging particulate matter contained in the exhaust gas of a diesel engine that uses fuel of quality less than or equal to that of fuel oil, and a collector electrode for collecting the electrically charged particulate matter; and a cyclone-type separation and collection means for selecting and collecting the particulate matter that has peeled off from the tubular collection unit. The exhaust gas processing device is characterized in that a cyclone collection means constituted of one or more tangential cyclones is provided to a high-concentration exhaust gas discharging section for discharging exhaust gas with a high particulate matter concentration, the high-concentration exhaust gas discharging section being located in the vicinity of an inner surface of a downstream portion of the tubular collection unit, and a stream of high-concentration gas discharged from the high-concentration exhaust gas discharging section is selectively introduced to the tangential cyclone(s) according to the flow rate of the exhaust gas.

Description

technical field [0001] The present invention relates to removal and purification of particulate matter (Particulate Matter: hereinafter referred to as "PM") and harmful gases mainly containing carbon contained in the exhaust gas of a diesel engine, especially for ships, power generation, and industry. Exhaust gas treatment technology for large-displacement diesel engines that use low-quality fuel below heavy oil, and more specifically, relates to exhaust gas that utilizes corona discharge in large-displacement diesel engines that discharge high-temperature exhaust gas Processing device. Background technique [0002] Diesel engines are widely used as power sources for various ships, engines, large construction machinery, and various automobiles. However, the PM contained in the exhaust gas discharged from the diesel engines not only causes well-known air pollution, but also It is an extremely harmful substance to the human body, so the purification of the exhaust gas is extr...

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Problems solved by technology

[0021] That is, in the electrical treatment method and device for diesel engine exhaust described in the aforementioned Patent Document 1, the length of the electrode needle 24 of the discharge charging part 22 in the flow direction of the exhaust gas flow is short, and the collecting plate 23 is arranged on the In the direction at right angles to the flow direction of the exhaust gas flow, and because the exhaust gas flow directly contacts with the trapping plate 23, the flow resistance (pressure loss; pressure loss) is large, and since the trapping plate 23 is thin and exhausts The length of the flow direction of the airflow is short, so there is a possibility that PM will pass through without stopping, and there is a concern that the PM collection efficiency cannot be sufficiently improved, and there is a possibility that PM that has passed through the collection plate 23 cannot pass through the corona discharge again. Instead of being charged and trapped, it is the problem of being discharged as it is

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