Efficient standard solution production purification system for vehicle urea

Abstract

The invention provides an efficient standard solution production purification system for vehicle urea. The system comprises a gravel filtering system (1), an activated carbon filtering system (2), a pressure pump (3), a micro-filtering device (4), an ultra-filtering device (5), a middle water tank (6), a high-pressure pump (7), a primary reverse osmosis device (8), a secondary reverse osmosis device (9) and an EDI system (10). The efficient standard solution production purification system for the vehicle urea can be used for replacing a crystallization method adopted in traditional urea purification, electric energy can be saved, discharging of waste liquid in the crystallization process can be reduced, the efficient urea standard solution production purification system is a new breakthrough in the technical field of the urea for the vehicle, the content of the impurities of the urea for the vehicle can be controlled below 10-20 ppm, the conversion rate of oxynitride can reach up to 95 percent, the requirement for the diesel vehicle exhaust emission standard of the national level 4 and the national level V can be completely met, and important economic value and social value are achieved.

Description

technical field [0001] The invention relates to the field of diesel exhaust post-treatment systems, in particular to a novel and efficient method for producing urea for vehicles. Background technique [0002] Urea for vehicles is suitable for cars, trucks, buses and heavy-duty off-road diesel engine vehicles equipped with SCR (vehicle selective catalytic reduction exhaust aftertreatment) system. It is a consumable that must be used in SCR technology. It is compatible with SCR catalysts Together they convert harmful nitrogen oxides emitted by diesel engines into harmless water vapor and nitrogen. As the implementation time of the National IV emission standard is approaching, major domestic cities such as Beijing, Shenzhen, and Shanghai have begun to implement the National IV standard ahead of schedule. At the same time, at present, most domestic medium and heavy trucks, buses, and buses adopt the SCR technology route to meet the requirements of the National IV emission stand...

AI Technical Summary

Problems solved by technology

At the same time, at present, most domestic medium and heavy trucks, buses, and public transport vehicles adopt the SCR technology route to meet the requirements of the National IV emission standards. Therefore, the vehicle urea solution required by the SCR system has become a consumable equivalent to diesel

[0003] At present, the research on urea technology for vehicles has also been carried out, such as: a preparation method of urea for vehicles (patent number 201210003845.7), a urea reducing solution for vehicles (patent number 201210065471.1), and other methods. The method of urea production is to purify industrial urea, such as the method of re-crystallizing urea from an aqueous solution. This method requires multiple crystallization and purification. First, the urea solution needs to be heated to 70-80°C, and then the temperature is lowered. Crystallize at 20-40°C, and then mix with high-purity water. This method causes a lot of waste of power consumption and energy, and also needs to discharge a large amount of waste liquid generated during the crystallization process.

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