Urea injection device, urea tank for heating urea, and heating method

Abstract

The invention discloses a urea tank for heating urea and a heating method thereof, including a urea tank main body, a urea heating water pipe and a urea electric heating device for heating the inside of the urea tank main body; The upper part and the lower part inside the main body of the urea tank are cut off; the urea replenishing valve is located on the partition plate and is used to conduct the upper part and the lower part inside the main body of the urea tank. The amount of urea thawed by the urea electric heating device is small, which can quickly complete the urea thawing and pressure building, shorten the urea supply time under the low temperature environment of the whole vehicle, reduce the ineffective time of SCR, and indirectly reduce the NOx emission pollution in the low temperature environment of the whole vehicle. The urea heating water pipe can thaw the urea in the upper part and continuously flow into the lower part of the main body of the urea tank to complete the continuous supply of urea. The above method realizes rapid thawing of urea and shortens the thawing time. The invention also discloses a urea injection device with the above-mentioned urea tank.

Description

technical field [0001] The invention relates to the technical field of environmental protection, relates to a urea injection device, and in particular to a urea tank and a heating method for heating urea of ​​the urea injection device. Background technique [0002] The existing SCR technology for engines requires a urea injection device to inject a urea aqueous solution into the exhaust gas. The urea injection device mainly includes urea tank, urea pump, urea pipe, urea nozzle and urea heating and defrosting device. Among them, the urea heating and thawing device is mainly used to heat and thaw the urea when it freezes (-11°C), so as to ensure the normal injection of the urea. The existing urea depyrogenation and thawing device mainly has two technical solutions, specifically: water heating and electric heating. Water heating is to use engine coolant to heat components such as urea tank and urea pipe. Electric heating is to use resistance wire to heat components such as u...

AI Technical Summary

Problems solved by technology

[0003] Due to the slow temperature rise of the engine coolant and the influence of water flow at low temperature in winter, the urea heating and thawing time is relatively long

Due to the limitation of the electric heating power of the urea tank heating resistance wire, the urea heating and thawing time is relatively long

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