Tail gas particle purifier of diesel engine

Abstract

The invention relates to a tail gas particle purifier of a diesel engine. The purifier comprises a gas inlet pipe connected with the diesel engine, and two branch purifiers connected to the gas inlet pipe. The branch purifiers are of the same structure. Each branch purifier comprises a branch gas inlet pipe, a butterfly valve is installed on the branch gas inlet pipe, the branch purifier is provided with a ceramic filter, an igniting electric heater is installed in front of the ceramic filter, and a temperature sensor for measuring the heating temperature is arranged in front of the electric heater; a pressure sensor and a pressure reference tube are installed on the gas inlet pipe; and a combustion-supporting gas pipe for conveying combustion-supporting gas is arranged between the branch gas inlet pipes and located behind the butterfly valves of the branch purifiers. The tail gas particle purifier of the diesel engine has the beneficial effects that 1, judgment of a regeneration point is conducted through the reference method, errors caused by the working condition, the type, the abrasion degree and other factors of the diesel engine can be counteracted, judgment of the regeneration point is accurate, and field debugging is convenient; and 2, the combustion-supporting gas required by combustion of particles during regeneration is from tail gas exhausted by the diesel engine, and the situation that the pressure of vehicle-mounted compressed air is decreased, and accordingly, the driving safety is affected is avoided.

Description

technical field [0001] The utility model relates to a diesel engine tail gas particle purifier, which filters the particles in the diesel engine automobile tail gas by filtering ceramics, heats the particles in the ceramics with an electric heater during regeneration, and uses the diesel engine tail gas to support combustion. Background technique [0002] In the prior art, the particles emitted by diesel engine exhaust are generally captured by wall-flow ceramic filters. When the particles in the ceramic filter accumulate to a certain amount, that is, when the regeneration point is reached, the ceramic filter is regenerated. Particles are removed for further filtration. In the prior art, the judgment of the regeneration point is obtained by measuring and calculating the speed of the diesel engine, the back pressure at the end of the exhaust pipe of the diesel engine, and the exhaust temperature. There is an error between the regeneration point calculated by the calculation ...

AI Technical Summary

Problems solved by technology

In the prior art, the judgment of the regeneration point is obtained by measuring and calculating the speed of the diesel engine, the back pressure at the end of the exhaust pipe of the diesel engine, and the exhaust temperature. There is an error between the regeneration point calculated by the calculation formula and the actual regeneration point. It is necessary to correct the calculation formula after repeated testing of the operation of the diesel engine, which is very inconvenient for debugging; The air is provided by the on-board air compressor. Due to the large amount of air required, it is easy to cause the pressure drop of the on-board compressed air, which affects driving safety.

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