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Laundry detergent production factory house about urea crystal formation

by:Meibao     2020-10-21
Five truck, new countries to run thirty thousand kilometers is don't think the so-called 270 horsepower car speed run, also special oil. To the repair shop to check, the result is the post-processing catalysts the front end of the SCR system, has been a big gray solid blockage, apparently caused by urea crystallization. This is because the urea solution is unqualified. Catalysts structure design flaws: early production vehicles often appear urea the distance between the nozzle to the SCR catalysts are too short, as the urea is jet had not a moment after gasification is reach the catalyst carrier, thus forming crystal; Distribution and urea and the Angle of nozzle installation pedestal welding encapsulation does not conform to the requirement. Effect of the spray nozzle and nozzle failure: the post-processing SCR system can be divided into common models choose no gas type and have spirit help type two kinds. General urea of the airless spray work pressure is relatively high, so often appear nozzle needle valve closed lax, resulting in low temperature stage still work, shouldn't work urea can't high temperature hydrolysis so that rapid crystallization, have spirit to nozzle is normally open type of urea and its atomization is assisted by pressure, such as urea pump pressure piping malfunction or nozzle at high temperature cracking can cause bad jet atomization, as a result causes crystallization jam. Stalled after urea pump to empty is not completely: as the vehicle to stop working after urea pump and piping in the presence of residual liquid, so the vehicle off after the ignition switch must be clean, prevent crystallization or freeze. Detergent production factory house, the previous: liquid detergent production machine how many money?
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