Structure of container for reducing agent

Abstract

On the upper surface of a container body, there are installed at least a base section of a water level meter for detecting the remaining amount of a liquid reducing agent, a base section of a concentration meter for detecting the concentration of the liquid reducing agent, a heat exchanger surrounding each of detection sections of the water level meter and the concentration meter and exchanging heat between an engine coolant and the liquid reducing agent by circulating the engine coolant, and a suction tube provided between the water level gauge and the concentration meter and sucking the liquid reducing agent from the bottom of the container body. A substantially box-like protector is installed so as to surround the water level meter, concentration meter, and suction tube that are positioned at the lower part of the heat exchanger. Heat discharged from the lower part of the heat exchanger is confined inside the protector, and convection is produced in the confined region. By this, the liquid reducing agent frozen around the water level meter, concentration meter, and suction tube is efficiently thawed.

Description

technical field [0001] The present invention relates to storage of nitrogen oxides (NO X ) The structure of the reductant container of the liquid reductant used in the exhaust gas purification device for reducing and purifying, and particularly relates to the technology that can perform the exhaust gas purifying function in a short time after the engine is started. Background technique [0002] To remove NO contained in engine exhaust X Japanese Patent Application Laid-Open No. 2000-27627 (Patent Document 1) discloses an exhaust gas purification system. [0003] The above-mentioned exhaust purification device injects and supplies liquid reductant corresponding to the engine operating state through the exhaust gas upstream of the reduction catalyst arranged on the engine exhaust pipe, so that the NO in the exhaust gas X Catalyst reduction reaction with liquid reducing agent, NO X Purified to harmless components. Here, the reduction reaction is used with NO X Ammonia gas ...

AI Technical Summary

Problems solved by technology

At the bottom of the reductant container, there are detection parts of a water level gauge and a concentration meter for detecting the remaining amount and concentration of the liquid reductant, and a suction port for the liquid reductant, so as long as the liquid reductant freezes slightly There is a possibility that not only the remaining amount and concentration of the liquid reducing agent cannot be detected, but also the liquid reducing agent cannot be supplied to the reduction catalyst.

For this reason, a heat exchanger is installed on the reducing agent container to circulate the engine cooling water and exchange heat with the liquid reducing agent. The thawing of the liquid reducing agent takes a certain amount of time

Images