EXHAUST GAS PROCESSING DEVICE, DIESEL ENGINE, AND EXHAUST GAS PROCESSING METHOD

摘要

An exhaust gas processing device includes a NOx detection sensor, a first catalyst provided to a first branch pipe, a second catalyst provided to a second branch pipe, a first pressure sensor and a second pressure sensor which are arranged on the upstream side of the first catalyst and the second catalyst and which detect pressures in the first branch pipe and the second branch pipe, and a control device that obtains flow rates of exhaust gas flowing through the first branch pipe and the second branch pipe based on detection values of the first pressure sensor and the second pressure sensor and obtains amounts of reducing agent to be given to the first catalyst and the second catalyst from the obtained flow rates and a concentration of NOx of the exhaust gas.

主权项

1. An exhaust gas processing device comprising:
a plurality of exhaust gas passages, wherein exhaust gas exhausted from a diesel engine is divided to pass through the exhaust gas passages; a reducing catalyst which is provided in each of the exhaust gas passages and reduces NOx in the exhaust gas by a reducing agent; a NOx detection sensor which is arranged on an upstream side of the catalyst in an exhaust gas flowing direction and which detects a concentration of NOx contained in the exhaust gas exhausted from the diesel engine; a pressure sensor which is arranged on an upstream side of each of the reducing catalysts in the exhaust gas flowing direction and which detects a pressure in each of the exhaust gas passages; and a control device that obtains a flow rate of the exhaust gas flowing through each of the exhaust gas passages based on at least a detection value of each of the pressure sensors, obtains a flow rate of NOx in each of the exhaust gas passages from the obtained flow rate of the exhaust gas in each of the exhaust gas passages and the concentration of NOx detected by the NOx detection sensor, and obtains an amount of reducing agent to be supplied to each of the reducing catalysts from the obtained flow rate of NOx in each of the exhaust gas passages.