Double helix production equipment for vehicle urea

Abstract

The invention discloses double-helix production equipment of urea for vehicle. The double-helix production equipment comprises a synthesis tank, a transfer pump, a crystallization kettle, a vacuum pump, a buffer tank and a circulating pump, wherein the synthesis tank comprises a liquid inlet, a liquid outlet, a gas inlet and a gas outlet; an input port of the transfer pump is connected with the liquid outlet of the synthesis tank; an output port of the transfer pump is connected with an entrance of the crystallization kettle; the buffer tank, the vacuum pump and the crystallization kettle are connected in turn; an input port of the circulating pump is connected with an exit of the crystallization kettle; an output port of the circulating pump is connected with the synthesis tank; two groups of helix baffles and hydrocyclones are also arranged in the synthesis tank; and a hydrocyclone is arranged at the gas inlet. In the invention, since the helix baffles and hydrocyclones are arranged in the synthesis tank, liquid ammonia and carbon dioxide gas can react sufficiently, the urea synthetic liquid obtained by the reaction in the synthesis tank is directly crystallized in a vacuum environment, the process flow is simplified, the production cost is reduced, and large-batch and high-purity urea for vehicle can be continuously produced.

Description

technical field [0001] The invention belongs to the technical field of producing urea for vehicles, and relates to a double-helix production equipment for urea for vehicles. Background technique [0002] According to the regulations of the national environmental protection department, all heavy-duty diesel vehicles sold from July 1, 2013 must meet the National IV emission standard. Compared with the National III emission standard, the National IV emission of heavy-duty diesel vehicles has reduced nitrogen oxide emissions by 30% %, particulate matter (PM) emissions have been reduced by more than 80%. In order to reduce nitrogen oxides and particulate matter in diesel vehicle exhaust emissions. At present, automobile manufacturers in Europe, the United States and other countries generally use selective catalytic reduction (SCR) technology to treat diesel vehicle exhaust to meet Euro V, Euro VI or even higher emission standards. [0003] Diesel vehicle exhaust treatment fluid...

AI Technical Summary

Problems solved by technology

However, the purity requirements of urea for vehicles are very high, and commercially available industrial or agricultural urea granules cannot be directly used to prepare urea solutions for vehicles due to the high content of biuret and other impurities.

Images