Heat preservation and preheating device and method for diesel engine of diesel locomotive

The invention provides an internal combustion locomotive diesel engine heat preservation and preheating device and method, and the heat preservation and preheating device comprises a heater which is used for heating circulating water of a diesel engine cooling circulation system and is arranged in an expansion water tank of the diesel engine cooling circulation system; one end of the preheating circulating water pump is connected with the expansion water tank, and the other end of the preheating circulating water pump is connected with a pipeline of the diesel engine cooling circulating system. According to the heat preservation preheating device, the heater is placed in the expansion water tank of the cooling circulation system, and the problems that the pressure loss of circulating water in a pipeline is large and the occupied space is large due to the fact that the heater is placed in the pipeline of the cooling circulation system are solved. 本公开提供了一种内燃机车柴油机保温预热装置和方法，保温预热装置包括：加热器，用于对柴油机冷却循环系统的循环水加热的加热器设置在柴