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Rapid quality evaluation method for urea reducing agent used by SCR tail gas post processing apparatus

A technology for post-treatment of exhaust gas and reducing agent, which is applied in the measurement of phase influence characteristics, color/spectral characteristics, material resistance, etc., which can solve the problem that the test cost and feedback speed are not suitable for end-user urea reducing agent quality evaluation and urea reducing agent samples. It does not have problems such as operability and long detection period, so as to save maintenance time and claim costs, and achieve intuitive results and low costs.

Active Publication Date: 2015-09-02
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its complex equipment, professional operation, long transportation, inspection and detection cycle, it is not suitable for end users to evaluate the quality of on-site urea reductant in terms of test cost and feedback speed, especially for users to quickly grasp the quality of urea reducing agent on the market The urea reducing agent samples produced by several or even a dozen large and small manufacturers that are optional for filling are not operable

Method used

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  • Rapid quality evaluation method for urea reducing agent used by SCR tail gas post processing apparatus
  • Rapid quality evaluation method for urea reducing agent used by SCR tail gas post processing apparatus
  • Rapid quality evaluation method for urea reducing agent used by SCR tail gas post processing apparatus

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Effect test

Embodiment 1

[0026] Take a urea reducing agent solution with a turbid and opaque appearance, but without visible floating and suspended turbid impurities, use the method in step 1 of the quick test method, and if it does not meet the above appearance requirements through visual inspection, it can be evaluated on-site as impurity content exceeding the standard. It can be judged as unqualified product. In fact, according to the national standard GB29518-2013 diesel engine nitrogen oxide reducing agent urea aqueous solution (AMS32), the water insoluble matter test is carried out, and the water insoluble matter is 107.5 mg / kg (the national standard requires that this item is not more than 20 mg / kg), rapid determination method and standard determination The results are consistent.

Embodiment 2

[0028] Such as figure 1As shown, take a random sample A, the appearance is clear, colorless and transparent, and meets the appearance requirements; first use the method in step 2 to take out the conductivity meter, pull out the electrode protective cover, turn on the power switch, and insert the test end vertically into the visually qualified In the urea reducing agent to be tested, the liquid surface is immersed in the protruding liquid level control line of the instrument, and the electrode end is slightly shaken to drive away the attached air bubbles. After the number displayed on the LCD screen is stable, read the value and it is the urea reducing agent to be tested. If the conductivity value is determined to be 421μS / cm, then use the method in step 3 to take out the urea reducing agent concentration measuring instrument, lift the protective cover of the refraction prism, and clean the refraction prism and On the surface of the cover plate, absorb the urea reducing agent t...

Embodiment 3

[0030] Take random sample B, the appearance is clear, colorless and transparent, first use the method in step 1 to visually judge whether it meets the appearance requirements; then use the method in step 2 to take out the conductivity meter, pull out the electrode protective cover, turn on the power switch, and connect the test terminal Insert vertically into the urea reducing agent to be tested that has passed the visual inspection, immerse the liquid level to the protruding liquid level control line of the instrument, shake the electrode end slightly to drive off the attached air bubbles, and read the value after the number displayed on the LCD screen is stable. is the conductivity value of the urea reducing agent to be tested, and the measured conductivity value is 1789μS / cm, which is determined to be a substandard product. In fact, the element content detection is carried out according to the national standard GB29518-2013 diesel engine nitrogen oxide reducing agent urea so...

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Abstract

The invention relates to a rapid quality evaluation method for a urea reducing agent used by a selective catalytic reduction (SCR) tail gas post processing apparatus. The rapid quality evaluation method is characterized by comprising the following specific detection steps: 1, selecting clear, colorless and transparent urea reducing agent products without floating or suspended impurityies visible to the naked eye by using an ocular estimation method; 2, removing an electrode protective jacket of a conductivity determinator, turning on a power switch, vertically inserting a test terminal into the urea reducing agent to be measured which is qualified based on the ocular estimation, and judging whether the impurity ion exceeds standard seriously by using a conductivity determination method; and measuring the urea reducing agent concentration by using the urea concentration determination method. After the three steps, the product can be determined to be basically qualified, the use requirement is generally satisfied, and serious consequences will not occur after use. The second step and the third step in the detection method provide verification for each other and are indispensible, but the detection order can be exchanged, and the product quality confirmation is not influenced. The urea reducing agent quality is comprehensively evaluated based on ocular estimation of the appearance state of the urea reducing agent, determination of the conductivity of the urea reducing agent, and determination of the concentration of the urea reducing agent. The urea reducing agent quality rapid evaluation method of the invention can rapidly and accurately determine the quality, has the advantages of simple operation, visual result and low cost, and satisfies the urgent market demands.

Description

technical field [0001] The invention relates to a method for quickly evaluating the quality of a urea reducing agent used in an SCR tail gas post-treatment device, in particular to a method for quickly evaluating the quality of a urea reducing agent used in an SCR tail gas post-processing device on site, which is applied to the industry of SCR post-treatment of automobile tail gas. Background technique [0002] With the full implementation of the National IV emission standards of the Chinese government, especially the release of the "Action Plan for the Prevention and Control of Air Pollution", it is especially proposed to strengthen the prevention and control of mobile pollution sources. [0003] At present, in response to the implementation of the National IV emission regulations, most domestic heavy-duty diesel vehicles adopt SCR technology. The reason is mainly that SCR has many advantages, for example, it can have 50-85% NO in the range of exhaust temperature 250-550oC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/29G01N27/06G01N21/41
Inventor 米新艳张克金曹婷婷崔龙吴碧磊王冬泉王义刚
Owner CHINA FIRST AUTOMOBILE
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