(EN) Disclosed is a device for cooling and heating a urea solution to be dispersed into exhaust gas, which is discharged from an engine, in order to reduce nitrogen oxides in the exhaust gas. The present invention provides a device for cooling and heating a urea solution for a construction machine, the device comprising: an engine having a cooling fan, a coolant pump and a main cooler; a urea solutiontank storing a urea solution and having an embedded heat exchange pipe through which a first cooling water or a second cooling water circulates; an additional cooling water tank for storing the secondcooling water; a water pump for supplying the second cooling water of the additional cooling water tank to the heat exchange pipe; a valve to be opened or closed so as to supply the first cooling water and the second cooling water to the heat exchange pipe through a supply line, or moving the first cooling water and the second cooling water, which are discharged from the heat exchange pipe through a discharge line, to the coolant pump and the additional cooling water tank; and a controller for supplying the second cooling water to the heat exchange pipe through the supply line when the urea solution temperature exceeds a set temperature, and supplying the first cooling water to the heat exchange pipe through the supply line when the urea solution temperature is below or equal to the set temperature, and turning the valve on or off.
(ZH) 公开了一种用于冷却和加热要分散到从发动机排出的排气中的尿素溶液以便减少排气中的氮氧化物的装置。本发明提供了一种用于建筑机械的用于冷却和加热尿素溶液的装置，该装置包括：发动机，其具有冷却风扇、冷却剂泵和主冷却器；尿素溶液罐，其储存尿素溶液并具有内置的热交换管，第一冷却水或第二冷却水通过所述热交换管循环；另外的冷却水罐，其用于储存第二冷却水；水泵，其将来自所述另外的冷却水罐的第二冷却水供应至热交换管；阀，其被构造成打开或关闭，以便将第一冷却水和第二冷却水通过供应管线供应至热交换管并且使从热交换管通过排出管线排出的第一冷却水和第二冷却水移动至冷却剂泵和所述另外的冷却剂罐；以及控制器，其用于在尿素溶液温度超过设定温度时将第二冷却水通过供应管线供应至热交换管并在尿素溶液温度低于或等于设定温度时将第一冷却水通过供应管线供应到热交换管，并且该控制器打开或关闭所述阀。