GB 29518-2013Diesel engines NOx reduction agent -- Aqueous urea solution (AUS 32) (English PDF)

Foreword

This standard in Chapters 4 and 5 are mandatory, the rest are recommended.

This standard was drafted in accordance with rules GB/T 1.1-2009 given.

This standard uses redrafted modified method using ISO 22241-1.2006 "Diesel engine NOx reduction agent AUS32 1

Part. Quality Requirements ", ISO 22241-2.2006" Diesel engine AUS32 reducing the nitrogen oxides - Part 2. Test Method "and

ISO 22241-3.2008 "Diesel engine AUS32 reducing the nitrogen oxides - Part 3. handling, transport and storage."

This standard and ISO 22241-1.2006, ISO 22241-2.2006 and ISO 22241-3.2008 has more adjustment compared to the previous structure, attached

M record listed in this standard and ISO 22241-1.2006, ISO 22241-2.2006 and ISO 22241-3.2008 Number of control clauses

List.

This standard and ISO 22241-1.2006, ISO 22241-2. there is a technical difference compared to 2008.2006 and ISO 22241-3

Appendix N given in the corresponding technical Differences in the list.

This standard was proposed by the Ministry of Environmental Protection of the People's Republic of China.

This standard petroleum products by the National Standardization Technical Committee Technical Committee petroleum fuels and lubricants and lubricant (SAC /

TC280/SC1) centralized.

Drafted by. China Petrochemical Sales Co., Ltd. North China Branch, China Environmental Science Research Institute, China Petroleum & Chemical shares have

Lubricating Oil Company Limited, China Environmental Science Research Institute, China National Petroleum Marketing Company, China Petroleum Lanzhou lubricant research and development centers,

Sichuan Meifeng Chemical Co., Ltd.

1 Scope

This standard specifies a diesel engine NOx reduction agent --- aqueous urea solution (AUS32) terms and definitions, identification technology to

Sum test methods, inspection rules, marking, packaging, transportation and storage, and make a recommendation to the requirements of filling interface products.

This standard applies to diesel selective catalytic reduction of nitrogen oxides with a reducing agent system --- aqueous urea solution (AUS32).

2 Normative references

The following documents for the application of this document is essential. For dated references, only applies to the version dated paper

Pieces. For undated references, the latest edition (including any amendments) applies to this document.

Preparation GB/T 601 standard titration solution Chemicals

GB/T 614 General Method Chemicals refractive index determination (GB/T 614-2006, ISO 6353-1. 1982, NEQ)

GB/T 1884 Density of crude oil and liquid petroleum products laboratory assay (densitometer method) (GB/T 1884-2000, eqvISO

3675.1998)

GB/T 1885 Petroleum Measurement Tables (GB/T 1885-1998, eqvISO 91-2.1991)

GB/T 6682 for analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)

SH/T 0604 Crude petroleum and petroleum products densitometry (U-shaped vibrating tube method) (SH/T 0604-2000, eqvISO 12185.1996)

Petroleum products ISO 4259 Test Method Determination of precision data (Petroleumproducts-Determinationand

applicationofprecisiondatainrelationtomethodsoftest)

Determination of free formaldehyde content of sodium sulfite titration (Binders ISO 9020 Paints and varnishes amine resin binder

forpaintsandvarnishes-Determinationoffree-formaldehydecontentofaminoresins-Sodiumsulfite

titrimetricmethod)

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

Selective catalytic reduction system selectivecatalyticreductionsystem; SCR

Installed in a diesel engine exhaust system, by injecting the reducing agent, nitrogen oxides in the exhaust gas catalytically reduced to nitrogen and water in a catalytic

Conversion means.

3.2

AUS32 dedicated urea ureaforAUS32

It contains only industrially produced urea, free of aldehydes and other trace substances biuret, ammonia and water (e.g., anti-caking agent), sulfur and vulcanization

, Chloride, nitrate and other compounds.

Note. For the above-mentioned contaminants, will have influence in the urea production process, and to strictly control the content of the test method, as used in agricultural production

Urea typically contains the compound.

3.3

Water purewater

With a single distillation, deionization, reverse osmosis or ultrafiltration, etc. The method of preparation of the third grade water GB/T 6682 provisions.

3.4

--- NOx reduction agent aqueous urea solution (AUS32) NOxreductionagent-Aqueousureasolution (AUS32)

Not containing any other additives (e.g., 3.2 shown) in pure AUS32 dedicated formulated together with the urea aqueous solution which urine

Su content of 32.5% (mass fraction), and meet the technical requirements specified in Chapter 5, referred to AUS32.

Note. the tracer in accordance with Table 1 may be used as an additive.

4 logo

Shall have the following markings on the charging pump and the container AUS32 compliance with this standard.

AUS32 GB 29518

5 technical requirements and test methods

Technical requirements and test methods for reducing nitrogen oxides in diesel engines --- aqueous urea solution (AUS32) shown in Table 1.

Table 1 --- diesel engine NOx reduction agent aqueous urea solution (AUS32) technical requirements and test methods

Project Quality Index Test Method

Urea content a (mass fraction) /% 31.8 33.2 Appendix Ad ~

Density b (20 °C) / (kg/m3) 1087.0 ~ 1093.0 SH/T 0604e

Refractive index c20nD 1.3814 ~ 1.3843 GB/T 614

Impurities

Alkalinity (in terms NH3) (mass fraction)/not more than 0.2%

Biuret (mass fraction)/not more than 0.3%

Aldehydes (in terms HCHO)/(mg/kg) no greater than 5

Insolubles/(mg/kg) not more than 20

Phosphate (in terms PO4)/(mg/kg) not greater than 0.5

Ca/(mg/kg) not greater than 0.5

Fe/(mg/kg) not greater than 0.5

Cu/(mg/kg) not more than 0.2

Zn/(mg/kg) not more than 0.2

Cr/(mg/kg) not more than 0.2

Ni/(mg/kg) not more than 0.2

Al/(mg/kg) not greater than 0.5

Mg/(mg/kg) not greater than 0.5

Sodium/(mg/kg) not greater than 0.5

K/(mg/kg) not greater than 0.5

Appendix B

Appendix C

Appendix D

Appendix E

Appendix F

Appendix G

Reference spectrum is consistent with the consistency confirmation Appendix H

Note. If you need to add a tracer to AUS32, we should ensure that the tracer does not affect the AUS32 meet the technical requirements in this table, it will not hurt

SCR systems.

a target value of 32.5% (mass fraction).

b target 1090.0kg/m3.

c target 1.3829.

Deduction of ammonia from nitrogen d is calculated.

e can be used GB/T 1884 and GB/T 1885, when the result of objections to SH/T 0604 arbitration method.

6 Inspection Rules

7 signs, packaging, transportation and storage

8 filling Interface

Referring to Appendices Appendix K and L are predetermined.

Appendix A

(Normative)

Determination of urea content AUS32 (TN method)

A.1 Scope

This annex specifies a method for measuring the total nitrogen content of urea AUS32 method.

This method is suitable for detecting the urea solution in the urea content 30.0% to 35.0% (mass fraction).

A.2 Summary of Method

Samples high temperature combustion in an oxygen stream, nitrogen in the sample completely converted to nitrogen oxides. The generated interference component by a suitable absorbent

Removal of the nitrogen oxides are reduced to molecular nitrogen quantified after a thermal conductivity detector. Urea nitrogen content was determined by deducting from the total nitrogen reduction in diurea

Calculated.

A.3 instruments and equipment

A.3.1 automatic azotometer

Automatic Azotometer combustion.

A.3.2 Analytical balance

A sense of the amount of 0.0001g.

A.3.3 aids

Example.

---tweezers;

Trace --- blunt spatula;

--- pipette, from a fixed or variable size to 1000µL capacity 10µL pipette;

--- commonly used laboratory glassware.

A.4 reagents and materials

A.4.1 Water

In line with GB/T 6682 in two water requirement.

A.4.2 accelerant and other supplies

The selection azotometer used. The following examples are for reference only, container or other material may be used as needed.

Example.

--- tin capsules or the like sample container;

--- nitrogen-free oxidant, such as sucrose, cellulose;

--- nitrogen-liquid absorbent, such as magnesium oxide.

A.4.3 nitrogen Standards

Preferred materials certification standards, such as ethylenediaminetetraacetic acid (ethylenediaminetetraaceticacid, EDTA), and nicotinamide

(Nicotinicacidamide), may also be used high purity low biuret urea content (e.g., analytical pure urea crystals or urea),

Or equipment manufacturers recommendations or other similar reference materials provided.

A.4.4 oxygen

Purity of not less than 99.995%.

A.4.5 other gases

Depending on the requirements Azotometer selection.

A.5 analysis step

A.5.1 sample preparation

Samples should be completely dissolved, crystals can not be urea. If necessary, the sample may be heated to no more than 40 °C.

A.5.2 standard curve plotted

The requirements azotometer be used, according to the procedure A.5.4 to establish a standard curve.

A.5.3 working state testing equipment and standard curve

With a suitable reference material testing instrument conditions and the standard curve, preferably urea certified standard solutions. Inspection frequency

Depending on the use required azotometer may be.

A.5.4 Determination

Weighed sample is placed in line with a certain quality requirements azotometer suitable container (such as a tin capsule) in. The sample size of the sample shall ensure that its nitrogen content

In the middle range of the standard curve.

With approximately three times the amount of the oxidant (e.g., no nitrogen cellulose) and the liquid absorbent (such as magnesium oxide).

When a liquid sample delivery system, sample volume not less than 100µL. The sample mass calculated SH/T 0604 obtained density

get.

Enter the required data (e.g., quality, sample type) to azotometer (or computer) in. The measured amount of sample into the analyzer and start

combustion.

Each sample was subjected to at least three determinations.

Calculation and results expressed A.6

A.6.1 calculation results

First, calculate the standard curve should drift to correct a result of analysis by measuring the blank reading. Then use the instrument that comes with the program

To the standard calibration curve.

If the relative standard deviation of the test results (RSD) of greater than 1%, will have to re-test the samples.

Calculating the average, with at least three samples of a nitrogen content of the urea content of the test results according to formula (A.1) is calculated.

wU = 2.1438 × (wN-F × wBi) (A.1)

Where.

wU --- urea content (mass fraction),%;

wN --- average nitrogen content (mass fraction), two decimals,%;

--- F. Biuret factor into nitrogen (0.4076);

Appendix C WBI --- the concentration of the biuret assay (mass fraction)%.

A.6.2 The results indicate

To the arithmetic mean of three independent determination results do measurement results. After calculation reserved to one decimal place, in%.

A.7 precision

Table A.1.

Table A.1 precision

Urea content (mass fraction) wU /% Repeatability r /% Reproducibility R /%

100 (B.1)

Where.

W (NH3) --- Alkalinity (in terms NH3) (mass fraction),%;

V --- volume of standard solution of hydrochloric acid consumed in titration, in milliliters (mL);

C --- hydrochloric acid standard titrant concentration in mol per liter (mol/L);

--- M ammonia molar mass in grams per mole (g/mol), M = 17.03;

--- mass mS sample in grams (g).

B.6.2 results indicate

In the arithmetic mean of test results of two test as a final result, data retention to 0.01% (mass fraction).

B.7 precision

Table B.2.

Table B.2 Precision

Alkali content (mass fraction) w (NH3) /% Repeatability r /% Reproducibility R /%