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Preparation method and preparation system of urea for vehicles

A technology for vehicle urea and preparation system, which is applied in the field of vehicle urea preparation method and preparation system, can solve the problem of not meeting the national standard requirements of diesel engine nitrogen oxide reducing agent, increasing the production cost of vehicle urea solution, and reducing the production of vehicle urea Enterprise profits and other issues, to achieve the effect of easy backwashing and maintenance, prevent nozzle clogging, and prevent catalyst deactivation

Inactive Publication Date: 2021-05-28
江苏艾德露环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Agricultural urea will bring metal ions Fe, K, Ca, etc. during the production and packaging process. Metal ions and impurities such as biuret and melamine in urea will deactivate the catalyst in the SCR system and reduce the reaction rate, so it is directly blended with agricultural urea Can not meet the national standard requirements of diesel engine nitrogen oxide reducing agent, long-term use of unqualified urea aqueous solution will block and damage SCR, resulting in large economic losses
Chinese patent application 201410488044.3 discloses a preparation method of urea for vehicles, which comprises crystalline urea and high-purity water, but the preparation of urea for vehicles increases the production cost of urea solution for vehicles and reduces the profits of urea manufacturers for vehicles

Method used

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  • Preparation method and preparation system of urea for vehicles
  • Preparation method and preparation system of urea for vehicles

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Embodiment 1

[0029] This embodiment provides a vehicle urea preparation system, including a dissolving tank 1, a first solution pump 2, a first polypropylene tow filter 3, a cooling tank 4, a second solution pump 5, and a second polypropylene tow filter 6 , reaction tank 7, the third solution pump 8, microfiltration membrane filter 9, backwash water tank 10, backwash pump 11 and finished product tank 12; There is a discharge port; the discharge port of the dissolution tank 1 is connected to the feed port of the first polypropylene tow filter 3 through the first solution pump 2, and the filtrate outlet of the first polypropylene tow filter 3 is connected to the inlet of the cooling tank 4 through a pipeline Connect, cooling tank 4 outlets are connected with the second polypropylene fiber tow filter 6 feeding ports by the second solution pump 5, the filtrate outlet of the second polypropylene fiber tow filter 6 is connected with the urea liquid inlet of reaction tank 7 tops by pipeline , the...

Embodiment 2

[0033] A preparation method of urea for vehicles, using the preparation system of embodiment 1, specifically comprises the following steps:

[0034] (1) Add 1000kg of desalted water at a temperature of 50°C in the dissolving tank 1, open the agitator, add 1500kg of agricultural urea, and stir for 0.5 to 1 hour to obtain a saturated urea solution; The urea saturated solution is pumped into the first polypropylene tow filter 3 to filter out insoluble impurities and then enters the cooling tank 4; after natural cooling in the cooling tank 4 for 0.5 to 2 hours, a cooling crystal suspension is obtained;

[0035] (2) enter retort 7 after the second solution pump 5 is pumped into the second polypropylene tow filter 6 to filter crystals by the cooling crystallization suspension in cooling tank 4, add desalted water and 100kg acetic acid in retort 7, React for 0.5 to 1 hour to obtain a urea acetate aqueous concentrate with a concentration of 30 to 35%;

[0036] (3) with the third solu...

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Abstract

The invention discloses a preparation method and a preparation system of urea for vehicles. The preparation method of urea comprises the following steps: (1) dissolving agricultural urea in high-temperature desalted water to obtain a urea saturated solution, filtering insoluble impurities out of the obtained urea saturated solution through a polypropylene fiber tow filter, and naturally cooling to room temperature to obtain cooled crystal suspension slurry; (2) filtering out crystals from the cooled and crystallized suspension slurry through a polypropylene fiber tow filter to obtain a urea water concentrated solution with the concentration of 30-35%; and (3) adding acetic acid into the obtained urea aqueous solution, reacting for a period of time, and filtering out impurities by adopting a microfiltration membrane to obtain the product. According to the present invention, the cost of the vehicle urea prepared by using the preparation method is low, the freezing point of the obtained urea is lower than -20 DEG C, and the scale inhibition and scale removal effects are provided during the use.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust purification, in particular to a method and system for preparing urea for vehicles. Background technique [0002] Diesel engine exhaust treatment fluid, commonly known as vehicle urea, is composed of 32.5% high-purity urea and 67.5% deionized water. It is mainly used to treat nitrogen oxides in diesel-fueled vehicle exhaust. Diesel engine exhaust treatment fluid It reacts with the nitrogen oxides in the exhaust gas to generate nitrogen and water, reducing the emission of nitrogen oxides in the vehicle exhaust. [0003] The conventional production process of urea for vehicles is to dissolve, purify and dilute commercially available agricultural urea or industrial urea in high-purity aqueous solution. Agricultural urea will bring metal ions Fe, K, Ca, etc. during the production and packaging process. Metal ions and impurities such as biuret and melamine in urea will deactivate the cataly...

Claims

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Application Information

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IPC IPC(8): B01F1/00B01D29/44B01D61/14C07C273/16
CPCB01D29/44B01D61/147C07C273/16B01F21/10
Inventor 朱秀峰
Owner 江苏艾德露环保科技有限公司
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