In order to solve the problem of increased exhaust caused by the installation of an exhaust water washing tank assembly in an explosion-proof diesel exhaust cooling system

an exhaust spray cooling system consisting of water jacket cooling

heat exchange tube cooling and two-stage spray cooling was designed

and then the key factors affecting the cooling effect

such as the spray flow rate

spray particle size

injection method and two-stage spray ratio were tested at 1500 r/min and a torque of 700 N·m. Results show that the smaller the spray particle size

the better the spray evaporation in the high-temperature exhaust. Use of counter-current spraying with appropriate increase in the proportion of the second-stage spray flow allows to improve spray cooling effect. Moreover

the heat exchange tubes added to the system can increase the cooling of exhaust gas by circulating cooling water and reduce the amount of water used for spraying. As observed

using a spray cooling system with heat exchange tubes can reduce the exhaust temperature to 67 ℃ under the above mentioned operating conditions

thus meeting the requirements that the exhaust outlet operating temperature of explosion-proof diesel shouldn't exceed 70 ℃ as specified in the MT 990—2006.