Method and device for preventing solution crystallization and solution storage tank

Abstract

The invention discloses a method for preventing solution crystallization. The method comprises the following steps of monitoring environment temperature and concentration of a solution in real time, judging that there are crystals in the solution when the environment temperature is lower than a first preset value after being monitored, and the concentration of the solution is lower than a second preset value; and removing the crystals in the solution by employing an ultrasonic wave. The invention further discloses a device for preventing solution crystallization and a solution storage tank. Byemploying the embodiments of the invention, solution crystallization can be effectively prevented on the premise that solution quality is not destroyed, and safety is high.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method, a device and a solution storage tank for preventing solution crystallization. Background technique [0002] With the increasing requirements of environmental protection, the environmental protection departments of various countries have proposed to further reduce the nitrogen oxide pollutants emitted by diesel engines. At present, the mainstream method to deal with the exhaust pollution of diesel vehicles is to use selective catalytic reduction technology (SCR). The SCR system is installed in the exhaust system of diesel vehicles. NOx in the exhaust is catalytically reduced to N2 and O2. [0003] The vehicle urea solution is composed of 32.5% high-purity urea granules and 67.5% pure water. The vehicle urea is usually stored in a stainless steel tank with a capacity of 1 ton or several tons. When the vehicle urea solution is dehydrated or the temperatur...

AI Technical Summary

Problems solved by technology

This heating method will cause the walls of the urea storage tank to heat rapidly, so that the urea crystals will fall off from the tank wall and be suspended in the urea solution. Unless the heater raises the temperature of the entire solution to melt all the crystals, the suspended crystals will May block the infusion port or infusion line, causing malfunction

[0007] 2. Even if the above method can raise the temperature of all the urea solution in the storage tank to melt all the crystals, since the storage capacity of the storage tank is in tons, a high-power heater is required, resulting in a waste of resources. And no one is on duty, safety cannot be guaranteed

[0008] 3. Since the heat transfer of the urea solution for vehicles takes a certain amount of time, and it is not convenient to install a stirring device in the urea storage tank for vehicles, these reasons make the temperature near the tank wall near the heating zone in the storage tank very high, and the farther away from the tank wall The lower the partial temperature, the higher the temperature of local urea for vehicles will change the quality of urea for vehicles

Images