A kind of scr urea heating/cooling system and method

Abstract

The invention relates to the field of tail gas treatment of engineering machinery, in particular to an SCR urea heating / cooling system and method. It includes an engine and a radiator, and a heating and cooling pipe arranged in the urea tank. The heating and cooling pipe has a first water inlet port and a first water outlet port; the engine has a second water inlet port and a second water outlet port, and the radiator has a third water outlet port. The water inlet port and the third water outlet port, and the second water outlet port is connected through the third water inlet port, and the third water outlet port is connected through the second water inlet port to dissipate heat from the engine; wherein, the first water inlet port is respectively It is connected through the second water outlet port and the third water inlet port, and the first water outlet port is connected with the second water inlet port to heat the urea with the hot water output by the engine and cool down the urea with the warm water output by the radiator. This scheme can be controlled according to the real-time temperature of urea, so that the urea can always work at a suitable temperature and ensure the discharge performance of the machine.

Description

technical field [0001] The invention relates to the field of exhaust gas treatment of engineering machinery vehicles, in particular to an SCR urea heating / cooling system and method. Background technique [0002] In the current construction machinery, with the upgrading of emissions, especially the installation of diesel engines in excavators. At present, ier4f engines that meet Euro IV emissions have been implemented in European and American markets. In order to meet the requirements of emission regulations, most engines use SCR systems, that is, selective catalytic reduction systems to reduce engine emissions. Urea is an odorless and non-toxic solution that is stored in specially configured urea tanks on diesel vehicles. When the exhaust gas is removed from the engine, it travels with the exhaust gas to the truck's catalytic converter, where the ammonia produced by pyrolysis converts nitrogen oxides into harmless nitrogen and water, greatly reducing exhaust emissions. Ure...

AI Technical Summary

Problems solved by technology

The urea solution is alkaline and highly corrosive to copper, cast iron, solder, and cast aluminum. It should not be lower than -11°C, because lower than -11°C will easily cause the urea solution to freeze, resulting in blockage of the urea pipe and urea tank, making the urea pump and urea nozzle unable to work, and affecting the exhaust function of the machine

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