Exhaust Gas Purifier of Engine used in Locomotive

Abstract

A exhaust gas cleaning purifier used in an engine of a locomotive, which is arranged between an exhaust pipe of the engine and a silencer connecting to the exhaust pipe, includes a front supply pipe and a back supply pipe configured for supplying secondary air, at least one front catalyst converter for making an oxidation reaction and at least one middle catalyst converter for making an reduction reaction, and at least one back catalyst converter arranged after the silencer and the back supply pipe. The front supply pipe connects with the exhaust terminal of the engine, and the back supply pipe connects with the silencer. The at least one front catalyst converter and the at least one middle catalyst converter are arranged in the silencer and arranged between the front and back supply pipes. A dissipating-heat distance is defined between the front catalyst converter and the middle catalyst converter.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an exhaust gas purifier and, more particularly, to an exhaust gas purifier which can effectively purify the gas exhausted from an engine of a locomotive.[0003]2. Description of the Related Art[0004]The locomotive engines, more particularly the two-cycle locomotive engines, are different from the automobile engines since they burn insufficiently to exhaust noxious exhaust gases. Furthermore, the automobile engines have a perfect engine control unit (ECU) to obtain more environmental parameters so as to ensure the normal operation of the engine and decrease the exhaust of the exhaust gases.[0005]Furthermore, not only the two-cycle locomotive engines, but also the four-cycle automobile or locomotive engines, have a catalyst converter arranged on a exhaust gas exhaust pipe. The catalyst converter is a metal cylinder covering a catalyst. The catalyst may include noble metals, such as Pd, Pt, ...

AI Technical Summary

Benefits of technology

[0010]To solve the conventional problems, one objection of the present invention is provided an exhaust gas purifier used in an engine of a locomotive, which can synchronously or separately supply secondary air of two supply pipes to catalyst and take actions with the catalyst, to synchronously take oxidation and reduction with the exhaust gas, in order to improve a purifying efficiency of the catalyst.

[0014]The present exhaust gas cleaning purifier uses the plurality of catalyst converter in the silencer to make the oxidation reaction and the reduction reaction synchronously. Furthermore, the exhaust gas cleaning purifier use the back catalyst converter to increase the efficiency of oxidizing the carbon monoxide and the hydrogen carbide of the exhaust gas if the actual rotating speed or the actual temperature of the engine is low and the carbon monoxide and hydrogen carbide are easy to be generated. The back catalyst converter also increases the efficiency of disoxidizing the nitrogen oxide of the exhaust gas if the actual rotating speed or the actual temperature of the engine is high and the nitrogen oxide is easy to be generated. Therefore, the exhaust gas cleaning purifier can effectually increases the purifying efficiency of the catalyst.

Problems solved by technology

The locomotive engines, more particularly the two-cycle locomotive engines, are different from the automobile engines since they burn insufficiently to exhaust noxious exhaust gases.

However, if stop guiding the secondary air, the front and back catalyst converters only make the reduction reaction with the exhaust gas, and the oxidation reaction with the exhaust gas weakens such that it is not advantageous for cleaning the exhaust gas by oxidizing and deoxidizing the exhaust gas synchronously.

However, if the front and back secondary air supply pipes are open synchronously, the secondary air make the reaction with the catalysts in the front and back catalyst converters synchronously such that the noxious nitrogen oxide of the exhaust gas can not be effectively deoxidized to the nitrogen and the oxygen.

Furthermore, the front and back secondary air supply pipes are generally controlled by a single switch such that it is not advantageous for cleaning the exhaust gas by oxidizing and deoxidizing the exhaust gas synchronously.

Furthermore, the conventional exhaust gas purifiers place the catalyst converters in the chamber, so it is not advantageous of the locomotives, which have a limit space.

The cost of processing the exhaust pipes increases.

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