Urea SCR system, control device for urea SCR system, and method for estimating deposition amount of white product

The technical problem can be solved by a urea SCR system (100) provided with a urea water injector (101), an SCR catalyst (102), and a control device (103) that determines the amount of added deposition of a white product in an exhaust path (105) on the basis of the amount of added urea water, the temperature of the exhaust gas, and the flow rate of the exhaust gas. The deducted accumulation amount of the white product in the exhaust path (105) is determined on the basis of the current accumulation amount of the white product in the exhaust path (105), the temperature of the exhaust gas, and the flow rate of the exhaust gas. The current accumulation amount of the white product in the exhaust path (105) and the sum of the added accumulation amount of the white product in the exhaust path (105) and the subtracted accumulation amount of the white product in the exhaust path (105) are used as the new accumulation amount of the white product in the exhaust path (105). 能够通过尿素SCR系统(100)解决技术问题，该尿素SCR系统(100)具备尿素水喷射器(1