Method and system for preparing urea aqueous solution for vehicles

A technology of urea aqueous solution and vehicle urea, which is applied in the direction of dissolution method, mixing method, dissolution system, etc., can solve the problems of large output and difficult sales, and achieve the effects of low cost, reduced water cost, and reduced production cost

Active Publication Date: 2019-09-10
PETROCHINA CO LTD
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, dust urea is a by-product produced by screening in the urea granulation section. Its output is large and it is difficult to sell, which brings huge burden and pressure to the production of enterprises and the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for preparing urea aqueous solution for vehicles
  • Method and system for preparing urea aqueous solution for vehicles
  • Method and system for preparing urea aqueous solution for vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The detection results of the analytical hydrolysis wastewater adopted in this embodiment are shown in Table 3.

[0073] Table 3 Analysis of the test results of hydrolyzed wastewater

[0074]

[0075]

[0076] Such as figure 1 Shown, the method for preparing aqueous urea solution for vehicles of the present embodiment comprises the steps:

[0077] 1. EDI processing

[0078] EDI treatment was carried out on the desorption and hydrolysis wastewater to obtain ultrapure water; after testing, the conductivity of the ultrapure water was 0.067 μS / cm.

[0079] 2. Preparation of aqueous urea solution

[0080] Mix the dust urea with the above-prepared ultrapure water according to metering, so that the dust urea is completely dissolved in the ultrapure water to prepare an aqueous urea solution.

[0081] 3. Preparation of aqueous urea solution for vehicles

[0082] Carry out primary filtration, homogenization, fine filtration and ultrafiltration to above-mentioned urea a...

Embodiment 2

[0088] The detection results of the analysis and hydrolysis wastewater adopted in this embodiment are shown in Table 5.

[0089] Table 5 Analysis of the test results of hydrolyzed wastewater

[0090]

[0091]

[0092] The method for preparing the aqueous urea solution for vehicles of the present embodiment may further comprise the steps:

[0093] 1. EDI processing

[0094] EDI treatment was carried out on the desorption and hydrolysis wastewater to obtain ultrapure water; after testing, the conductivity of the ultrapure water was 0.067 μS / cm.

[0095] 2. Preparation of aqueous urea solution

[0096] Mix the dust urea with the above-prepared ultrapure water according to metering, so that the dust urea is completely dissolved in the ultrapure water to prepare an aqueous urea solution.

[0097] 3. Preparation of aqueous urea solution for vehicles

[0098] Carry out primary filtration, homogenization, fine filtration and ultrafiltration to above-mentioned urea aqueous so...

Embodiment 3

[0104] Such as figure 2 As shown, the system for preparing aqueous urea solution for vehicles in this embodiment includes: EDI device 1, which is used to perform EDI treatment on desorption and hydrolysis wastewater to form ultrapure water with conductivity ≤ 0.1 μS / cm; mixing device 2, combined with EDI The device 1 is connected, and is used to mix dust urea and ultrapure water to prepare an aqueous urea solution; the purification system includes a preliminary filter device 3, a homogeneous device 4, a fine filter device 5 and an ultrafiltration device 6 arranged in sequence, and is used to sequentially treat the urea The aqueous solution is subjected to primary filtration, homogenization, fine filtration and ultrafiltration to prepare an aqueous urea solution for vehicles, and the primary filter device 3 is connected to the mixing device 2; wherein, the filtration accuracy of the primary filter device 3 is 25-50 μm, and the filtration of the fine filter device 5 The precisi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
electrical conductivityaaaaaaaaaa
electrical conductivityaaaaaaaaaa
Login to view more

Abstract

The invention provides a method and a system for preparing urea aqueous solution for vehicles. The method for preparing the urea aqueous solution for the vehicle comprises the following steps of: carrying out EDI treatment on desorption hydrolysis wastewater to prepare ultrapure water with conductivity less than or equal to 0.1 mu s/cm; Dissolving dust urea in the ultrapure water to prepare urea aqueous solution; sequentially carrying out primary filtration, homogenization, fine filtration and ultrafiltration on the urea aqueous solution to prepare the urea aqueous solution for vehicles; Wherein the filtration precision of the primary filtration is 25-50 mu m, the filtration precision of the fine filtration is 5 mu m, and the filtration precision of the ultrafiltration is 0.01mu m. The method uses dust urea and desorption hydrolysis waste water as raw materials to prepare the vehicle urea aqueous solution, which not only provides an effective way for the rational utilization of dust urea and desorption hydrolysis waste water, but also the prepared vehicle urea aqueous solution can meet the requirements of GB 29518-2013 standard.

Description

technical field [0001] The invention relates to a method for preparing urea for vehicles, in particular to a method and system for preparing an aqueous urea solution for vehicles. Background technique [0002] The urea aqueous solution for vehicles is a urea aqueous solution with a urea concentration of 31.8-33.2% and ultra-pure water as a solvent. It is mainly used to treat nitrogen oxides in the exhaust gas, so that heavy-duty trucks, buses and other diesel vehicles must meet the National IV emission standards. standard. Vehicle Selective Catalytic Reduction Exhaust Gas Post-Treatment Technology (i.e. SCR Technology) is a method commonly used in my country to reduce emissions from heavy-duty diesel vehicles. Metal ion poisoning occurs and the catalytic effect is lost. Therefore, the urea solution for vehicles must be prepared with first-class ultrapure water and high-purity urea in the electronics industry. [0003] At present, urea for domestic vehicles is mainly purifie...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01F1/00B01F3/22B01D53/94B01D53/56B01F23/80
CPCB01D53/9418B01D2251/2067B01F21/30B01F21/02B01F23/808
Inventor 包经珊刘会军马政文张娟平朱正祥豆怀斌武晓旭姜磊宋文亮解明志陈彦峰
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap