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DL/T 1990-2019 English PDF

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DL/T 1990-2019: Determination of sulfur trioxide in flue gas from thermal power plants - Controlled condensation method
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DL/T 1990-2019	English	229	Add to Cart	3 days [Need to translate]	Determination of sulfur trioxide in flue gas from thermal power plants - Controlled condensation method	Valid	DL/T 1990-2019

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Basic data

Standard ID	DL/T 1990-2019 (DL/T1990-2019)
Description (Translated English)	Determination of sulfur trioxide in flue gas from thermal power plants - Controlled condensation method
Sector / Industry	Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard	F29
Classification of International Standard	27.100
Word Count Estimation	10,181
Date of Issue	2019
Date of Implementation	2019-10-01
Issuing agency(ies)	National Energy Administration

DL/T 1990-2019: Determination of sulfur trioxide in flue gas from thermal power plants - Controlled condensation method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of sulfur trioxide in flue gas from thermal power plants-Controlled condensation method ICS 27.100 F 29 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard SO3 test method in flue gas of thermal power plant controlled condensation method 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Foreword...I 1 Scope of application...2 2 Normative references...2 3 Terms and definitions...2 4 Principle of the method...2 5 Sampling equipment...2 6 Reagents...4 7 Sampling procedure...4 8 Analysis steps...6 9 Calculation and presentation of results...6 10 Quality Control and Quality Assurance...6 Appendix A (Normative Appendix) Determination of the sampling flow rate and sampling nozzle of the suction pump...8 Appendix B (Normative Appendix) Determination of Water Bath Temperature...9

Foreword

This standard is in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation" Then drafted. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction and interpretation of the Environmental Protection Standardization Technical Committee of the Electric Power Industry. Drafting organizations of this standard. Guodian Environmental Protection Research Institute Co., Ltd., Guodian Nanjing Electric Power Test and Research Co., Ltd., Beijing Jingguodian Longyuan Environmental Engineering Co., Ltd., Fujian Longjing Environmental Protection Co., Ltd., China Datang Group Science and Technology Research Institute Co., Ltd. Central China Branch, Environmental Engineering Evaluation Center of Ministry of Environmental Protection, Nanjing Guodian Environmental Protection Technology Co., Ltd., Guodian Jiang Su Electric Power Co., Ltd., Zhejiang Zheneng Technology Research Institute Co., Ltd., State Grid Xinjiang Electric Power Co., Ltd. Electric Power Research Institute. The main drafters of this standard. Li Junzhuang, Zhu Lin, Zhu Fahua, Duan Jiuxiang, Mo Hua, Tang Jian, Yang Ding, Tang Guanghua, Pan Dingli, Zhong Hongling, Zhou Daobin, Wu Qibin, Zhou Xiaoxiang, Zhang Guoxin, Yang Lin, Yao Jie, Zhao Yang, Zheng Fang, Zhang Wenjie, Wei Han, Liu Yin. This standard is formulated for the first time. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Beijing No. 1 Ertiao, Baiguang Road, 100761). SO3 test method in flue gas of thermal power plant controlled condensation method

1 Scope

This standard specifies different shapes such as gaseous SO3, aerosol sulfuric acid mist and soluble sulfate in flue gas of thermal power plants. State SO3 test method. This method is suitable for testing SO3 in flue gas of thermal power plants. SO3 test in flue gas from stationary sources such as industrial and civil boilers Can refer to this standard for implementation. When the sampling volume is 0.5 m3, the detection limit of this standard method is 0.30 mg/m3.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable Used in this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method of gaseous pollutants GB/T 27025 General requirements for the competence of testing and calibration laboratories

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 Dry flue gas of standard condition The flue gas is moisture-free at a temperature of 273.15 K and a pressure of 101325 Pa. Unless otherwise specified, this standard Refers to the volume and concentration of dry flue gas under standard conditions. 3.2 Flue gas humidity The amount of moisture in the flue gas that coexists with 1 kg of dry flue gas. This standard refers to the volume percentage of water vapor content in wet flue gas. 3.3 Controlled condensation method After the temperature is controlled at (240~260)℃ by a suitable heating device, the coarse particles are filtered, and the condensing device is controlled to The SO3 in the flue gas is condensed and trapped, and the SO3 test method for the analysis of sulfate radicals by the barium perchlorate-thorium reagent titration method.

4 Principle of the method

Use a heated sampling gun to extract a certain amount of flue gas, control the temperature to be maintained between 240 ℃ and 260 ℃, and filter coarse The particulate matter, through the control of the condensing device, the SO3 is condensed to form a sulfuric acid mist with a suitable particle size, which is trapped under the action of inertial collision; The sulfuric acid mist that failed to be captured is collected through a secondary filter. Rinse the control condenser and secondary filter with isopropanol solution, and Collect flushing fluid. Use barium perchlorate-thorium reagent to titrate and analyze the SO42-concentration in the flushing solution, and calculate it with the sampling volume The concentration of SO3 in the flue gas.

5 Sampling equipment

5.1 Sampling mouth Determine the size of the sampling nozzle according to Appendix A. It should be ensured that the suction speed of the sampling nozzle is basically equal to the airflow speed at the measuring point. The relative error is less than ±15%. 5.2 Sampling gun The heating temperature of the sampling gun should be controlled at (250±10)℃, and there should be a temperature display device. The lining material can be quartz, corrosion-resistant Stainless steel with corrosion performance above 316L. 5.3 Heating filter It is composed of filter element, heating element and temperature control device. The filter element should be made of ceramic material. For a mark with a diameter of 1.0 μm For quasi-particles, the trapping efficiency of the filter element should be greater than 99.9%. Control the heating temperature (200±10)℃. 5.4 Heating connection pipe It is composed of air duct, heating device, thermal insulation layer and temperature control device. The air duct should be made of polytetrafluoroethylene. Heating temperature (130±10)℃. 5.5 Control the condenser The control condenser tube is composed of an inner tube and an outer tube. The inner tube is a serpentine tube, and the material should be glass. The inner diameter of the outer tube is 60 mm, and the inner The inner diameter of the tube is 4 mm, the inner tube circle diameter is 36 mm, the inner tube circle distance is 15 mm, and the length of the inner tube from point A to point B is not less than 2400 mm, see Figure 1. Figure 1 Schematic diagram of control condenser 5.6 Temperature control water bath device The temperature control range of the temperature control water bath device is (50~90)℃, and the adjustment accuracy is ±1℃. 5.7 Secondary filter The material of the secondary filter should be PTFE or quartz. For standard particles with a diameter of 0.3μm, secondary filtration The collection efficiency of the filter should be greater than 99.5%. 5.8 Air pump The pump flow rate should be adjustable within the range of (6~15) L/min, with temperature and pressure measurement functions before the flowmeter. 5.9 Flowmeter Used for measuring sampling flow, it shall have the function of measuring sampling instantaneous flow and cumulative flow, and the error shall not exceed ±2.0 %. 5.10 Dryer The dehumidification device for sampling flue gas is set in front of the flow meter.

6 Preparation of reagents and solutions

Unless otherwise specified, use analytical reagents that meet national standards. The experimental water is deionized water. 6.1 Barium perchlorate trihydrate (Ba(ClO4)2·3H2O). excellent grade pure. 6.2 Isopropanol. ρ((CH3) 2CHOH) = 0.79 g/ml. 6.3 Sodium hydroxide (NaOH). 6.4 Perchloric acid. ρ (HClO4) = 1.76 g/ml. 6.5 Glacial acetic acid. ρ (CH3COOH) = 1.05 g/ml. 6.6 Acetic anhydride. ρ (C4H6O3) = 1.08 g/ml. 6.7 Thorium reagent (C16H11AsN2Na2O10S2). pure superior grade. 6.8 Acetone. ρ (CH3COCH3) = 0.78 g/ml. 6.9 Potassium dichromate (K2Cr2O7). 6.10 Concentrated sulfuric acid. ρ (H2SO4) = 1.84 g/ml. 6.11 Isopropanol solution. 41. Measure 800 ml isopropanol (6.2) and add it to.200 ml water. Available now. 6.12 Barium perchlorate standard stock solution. ρ(Ba(ClO4)2) = 0.10 mol/L. Weigh 3.9027 g of barium perchlorate trihydrate (6.1), dissolve in 20 ml of water, dilute with isopropanol solution (6.2), and determine Volume up to 100 ml. (0~4) ℃ can be stored for 6 months. 6.13 Barium perchlorate standard liquid. ρ(Ba(ClO4)2)= 0.001 mol/L. Pipette 1.00 ml barium perchlorate standard stock solution (6.12), dilute with isopropanol solution (6.11), and dilute to 100 ml. Available now. 6.14 Sodium hydroxide solution. ρ (NaOH) = 0.10 mol/L. Weigh 2.00 g of sodium hydroxide (6.3), dissolve it in 500 ml of water, and store it in a polyethylene bottle. 6.15 Perchloric acid solution. ρ (HClO4) = 0.15 mol/L. Measure 8.5 ml perchloric acid (6.4), add to 500 ml glacial acetic acid (6.5) under stirring, and mix well. in room temperature Add 20 ml of acetic anhydride (6.6) dropwise. After cooling, dilute to 1000 ml with glacial acetic acid. 6.16 Thorium reagent indicator. ρ (C16H11AsN2Na2O10S2) = 2.0 g/L. Weigh 0.20 g of thorium reagent (6.7), dissolve it in 100 ml of water, and store it in a quartz glass bottle or polyethylene bottle. 6.17 Potassium dichromate lotion. Weigh 15.0 g of potassium dichromate (6.9), dissolve it in 30 ml of water, slowly add 300 ml of concentrated sulfuric acid (6.10) under stirring, Store in a glass bottle.

7 Sampling steps

7.1 Preparation for sampling 7.1.1 Prepare reagents according to (6). 7.1.2 Clean the inner tube of the control condenser tube and the secondary filter with acetone (6.8), and place it in a fume hood to dry for later use. If the control is cold There are solid foreign objects on the condenser and secondary filter that are difficult to clean. They can be treated with potassium dichromate lotion (6.17) and then used to remove them. Clean with water and acetone. 7.1.3 During the sampling period, the unit is in stable operation, and the boiler load fluctuation should not exceed ±5%. 7.2 Sampling process 7.2.1 Select representative sampling points according to GB/T 16157. 7.2.2 Measure the flue gas temperature and flue gas humidity at the sampling point, and determine the temperature of the condensing tube water bath according to Appendix B. 7.2.3 Connect the sampling system according to Figure 2 and check whether the system is leaking. If a leak is found, check and plug the leak in sections. Until the leak detection requirements are met. The leak detection method shall be implemented according to GB/T 16157. 7.2.4 Before sampling, the flue gas flow rate at the sampling point should be tested, and the sampling flow rate of the suction pump and the size of the sampling nozzle should be determined according to Appendix A. 7.2.5 Heat the sampling system, when the sampling gun, heating filter, heating connection pipe, and temperature control water bath device reach the setting Turn on the circulating water pump after the temperature; when the flue gas temperature at the inlet of the condensing tube is controlled at (130±10) ℃, sampling starts. 7.2.6 The sampling nozzle should face the direction of the airflow, and the angle between the centerline of the sampling nozzle and the flue gas flow should be less than 5°. 7.2.7 Each sampling point should be measured at least twice, and each sampling volume should not be less than 0.5 m3. 7.2.8 After sampling, rinse the control condenser and secondary filter three times with isopropanol solution (6.11). Combined collection Rinse solution and dilute to 250 ml. Make sampling records. 7.2.9 Every time you sample, you should bring 250 ml of isopropanol solution (6.11) to the sampling site as a blank sample for the whole procedure. The collected samples are stored together and brought back to the laboratory for analysis.

8 Analysis steps

8.1 Sample determination Adjust the pH value of the rinse solution (7.2.8) to 3.5 with sodium hydroxide solution (6.3) or perchloric acid solution (6.15). Join 4 Drops of thorium reagent indicator (6.16), titrate with barium perchlorate standard solution (6.13) until the solution turns from orange to pink. Record the volume of the standard barium perchlorate used dropwise. 8.2 Determination of blank samples in the whole procedure Titrate according to the same conditions (8.1) as the sample, and measure the barium perchlorate standard added to the blank sample of the whole procedure Use liquid volume. 8.3 Determination of laboratory blank samples Take 250ml of isopropanol solution (6.11) as a laboratory blank sample. According to the same conditions as the sample (8.1) Titration, measure the volume of the standard barium perchlorate used dropwise in the laboratory blank sample.

9 Calculation and presentation of results

9.1 Result calculation The mass concentration of sulfur trioxide in the flue gas should be calculated according to formula (1), namely. 9.2 Presentation of results The result should conform to the principle of rounding off the value, and the decimal point can be retained to the second place. 10 Quality control and quality assurance 10.1 The laboratory should meet the requirements of GB/T 27025, have a metrological certification (CMA) and a national conformity assessment Accreditation Committee Laboratory Accreditation Certificate (CNAS). 10.2 Based on the sampling volume of 0.5 m3, the measured value (8.2) of the blank sample in the whole procedure should not exceed the detection limit; It is 0.5 m3, and the measured value (8.3) of the laboratory blank sample should not exceed the detection limit. 10.3 The newly purchased or repaired sampling flowmeter should be calibrated before being put into use; the equipment needed for sampling should be Verification and calibration are within the validity period. 10.4 Pay close attention to the state of the desiccant during the sampling process to ensure that the desiccant is in an effective state before and after sampling. The desiccant should be replaced in time when it fails. 10.5 When the filter membrane in the secondary filter is found to be broken after sampling, the gasket should be checked or replaced. The current sampling is invalid. 10.6 Sample analysis should be completed within 24 hours after sampling.

Appendix A

(Normative appendix) Determination of sampling flow and sampling nozzle of suction pump A.1 Determination of sampling flow rate of suction pump The sampling flow rate of the suction pump should be calculated according to the formula (A.1).

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