阅读说明：本技术 一种高炉煤气中硫含量的检测方法 (Method for detecting sulfur content in blast furnace gas ) 是由 周桂海 于 2018-06-04 设计创作，主要内容包括：本发明公开了一种高炉煤气中硫含量的检测方法,主要解决现有高炉煤气中硫含量无法准确检测的技术问题。本发明的技术方案为：一种高炉煤气中硫含量的检测方法,包括以下步骤：取样；燃烧试样,将高炉煤气试样转移至燃烧管中进行燃烧,控制燃烧管的温度为800～900℃,高炉煤气燃烧过程中,向燃烧管内同时通入氧气和氩气,氧气流量为1.0～2.0L/min,氩气流量为2.0～3.0L/min；检测试样中硫的荧光积分响应值；计算高炉煤气中硫的质量含量。本发明方法本发明实现了高炉煤气中硫含量准确测定,操作简便,检测成本低,适用于高炉煤气、焦炉煤气、转炉煤气中硫含量的检测。(The invention discloses a method for detecting the sulfur content in blast furnace gas, which mainly solves the technical problem that the sulfur content in the blast furnace gas can not be accurately detected in the prior art. The technical scheme of the invention is as follows: a method for detecting the sulfur content in blast furnace gas comprises the following steps: sampling; burning a sample, namely transferring the blast furnace gas sample into a burning pipe for burning, controlling the temperature of the burning pipe to be 800-900 ℃, and simultaneously introducing oxygen and argon into the burning pipe in the burning process of the blast furnace gas, wherein the flow rate of the oxygen is 1.0-2.0L/min, and the flow rate of the argon is 2.0-3.0L/min; detecting a fluorescence integral response value of sulfur in the sample; and calculating the mass content of sulfur in the blast furnace gas. The method provided by the invention realizes accurate determination of the sulfur content in the blast furnace gas, is simple and convenient to operate, has low detection cost, and is suitable for detection of the sulfur content in the blast furnace gas, the coke oven gas and the converter gas.)

1. a method for detecting the sulfur content in blast furnace gas is characterized by comprising the following steps:

1) sampling, namely extracting 2-5 ml of blast furnace gas sample by using an injection tube;

2) Burning a sample, transferring the blast furnace gas sample into a burning pipe for burning, controlling the temperature of the burning pipe to be 800-900 ℃, simultaneously introducing oxygen and argon into the burning pipe in the burning process of the blast furnace gas, wherein the flow rate of the oxygen is 1.0-2.0L/min, the flow rate of the argon is 2.0-3.0L/min, and collecting waste gas generated after the blast furnace gas in the burning pipe is burnt;

3) Detecting a fluorescence integral response value of sulfur in a sample, dedusting the waste gas generated after the blast furnace gas is combusted in the step 2) by using a 0.2-micrometer filter membrane, and detecting a fluorescence integral response value I of sulfur in the dedusted waste gas by using an ultraviolet fluorescence detector;

4) the method comprises the steps of calculating the mass content of sulfur in blast furnace gas according to a formula I, wherein W is (a + b multiplied by I) multiplied by 10 ⁶/V, W is the mass content of sulfur in the blast furnace gas and is expressed by mg/m ³, a is background equivalent concentration and is expressed by mg, b is conversion of a fluorescence integral response value of sulfur to mass and is expressed by mg, I is the fluorescence integral response value of sulfur in the blast furnace gas and is not in a dimensional unit, V is the sample volume of the blast furnace gas and is expressed by mL, the conversion of the fluorescence integral response values of background equivalent concentration a and sulfur to mass is determined by a working curve equation of the relation between the mass of sulfur and the fluorescence integral response value of sulfur in a ³, specifically, the fluorescence integral response value is measured by an ultraviolet fluorescence spectrometer, the fluorescence integral response value is calculated by calculating the linear integral response value of sulfur in the gas combustion tube of the mass concentration of sulfur of 50mg/m, the fluorescence integral response value of sulfur in the gas combustion tube is expressed by a, the fluorescence integral response value of sulfur in a and is expressed by a, and is expressed by a linear regression equation of the fluorescence integral response value of sulfur in a, and is expressed by a standard curve equation of the fluorescence integral response value of sulfur in a.

2. The method for detecting the sulfur content in the blast furnace gas as claimed in claim 1, wherein the temperature of the combustion tube is controlled to be 840-890 ℃ in the step 2), oxygen and argon are simultaneously introduced into the combustion tube during the combustion process of the blast furnace gas, the oxygen flow is 1.5-2.0L/min, and the argon flow is 2.0-2.5L/min.

Technical Field

The invention relates to a method for detecting gas components of a blast furnace generated in the production process of the blast furnace, in particular to a method for detecting the content of sulfur in blast furnace gas, and belongs to the technical field of chemical analysis.

Background

³Blast furnace gas is a byproduct in the blast furnace ironmaking production process, and the main components of the blast furnace gas are carbon monoxide, carbon dioxide, nitrogen, hydrogen, sulfide and the like, wherein the carbon monoxide accounts for about 22-26%, the carbon dioxide accounts for about 16-19%, the hydrogen accounts for about 1-4%, the nitrogen accounts for 58-60%, and a small amount of sulfide gas belongs to important secondary energy.

the Chinese patent application publication No. CN103063790A discloses a method for detecting the content of hydrogen sulfide in coal gas, which is mainly characterized in that coke oven gas to be detected is subjected to a gas chromatographic column under specific conditions to separate the hydrogen sulfide in the coal gas from other components of the coal gas, and a characteristic peak area of the hydrogen sulfide is measured by a gas chromatographic detector to calculate the content of the hydrogen sulfide in a coal gas sample. The method can not be applied to the detection of the total sulfur content in blast furnace gas, and mainly has the following two problems: (1) the method is only suitable for detecting the coke oven gas sample, and the blast furnace gas components are completely different from the coke oven gas components and cannot be suitable for detecting the blast furnace gas sample. (2) The method is only suitable for detecting the content of the hydrogen sulfide in the coal gas, and the hydrogen sulfide is only one of sulfides in the coal gas and cannot replace the total sulfur content in the coal gas.

the Chinese patent application publication No. CN106770709A discloses a method for directly feeding a sample to a gas chromatograph to measure sulfur in various forms in coke oven gas, which mainly comprises the steps of separating sulfur in different forms in the coke oven gas by a chromatographic column, and detecting the characteristic peak area of sulfur in various forms by a flame photometric detector to calculate the sulfur content in various forms. The method is also only suitable for detecting the sulfur content in the coke oven gas, and meanwhile, the method can detect only the sulfur component with high content in the gas, so the method is still not suitable for detecting the total sulfur content in the blast furnace gas.

Disclosure of Invention

The invention aims to provide a method for detecting the sulfur content in blast furnace gas, which mainly solves the technical problem that the sulfur content in the blast furnace gas cannot be accurately detected in the prior art.

The invention adopts the technical scheme that the method for detecting the sulfur content in the blast furnace gas comprises the following steps:

1) Sampling, namely extracting 2-5 ml of blast furnace gas sample by using an injection tube;

2) burning a sample, transferring the blast furnace gas sample into a burning pipe for burning, controlling the temperature of the burning pipe to be 800-900 ℃, simultaneously introducing oxygen and argon into the burning pipe in the burning process of the blast furnace gas, wherein the flow rate of the oxygen is 1.0-2.0L/min, the flow rate of the argon is 2.0-3.0L/min, and collecting waste gas generated after the blast furnace gas in the burning pipe is burnt;

3) Detecting a fluorescence integral response value of sulfur in a sample, dedusting the waste gas generated after the blast furnace gas is combusted in the step 2) by using a 0.2-micrometer filter membrane, and detecting a fluorescence integral response value I of sulfur in the dedusted waste gas by using an ultraviolet fluorescence detector;

4) The method comprises the steps of calculating the mass content of sulfur in blast furnace gas according to a formula I, wherein W is (a + b multiplied by I) multiplied by 10 ⁶/V, W is the mass content of sulfur in the blast furnace gas and is expressed by mg/m ³, a is background equivalent concentration and is expressed by mg, b is conversion of a fluorescence integral response value of sulfur to mass and is expressed by mg, I is the fluorescence integral response value of sulfur in the blast furnace gas and is not in a dimensional unit, V is the sample volume of the blast furnace gas and is expressed by mL, the conversion of the fluorescence integral response values of background equivalent concentration a and sulfur to mass is determined by a working curve equation of the relation between the mass of sulfur and the fluorescence integral response value of sulfur in a ³, specifically, the fluorescence integral response value is measured by an ultraviolet fluorescence spectrometer, the fluorescence integral response value is calculated by calculating the linear integral response value of sulfur in the gas combustion tube of the mass concentration of sulfur of 50mg/m, the fluorescence integral response value of sulfur in the gas combustion tube is expressed by a, the fluorescence integral response value of sulfur in a and is expressed by a, and is expressed by a linear regression equation of the fluorescence integral response value of sulfur in a, and is expressed by a standard curve equation of the fluorescence integral response value of sulfur in a.

In the step 2), the waste gas generated after the blast furnace gas in the combustion pipe is combusted contains sulfur dioxide gas generated by the combustion of the blast furnace gas and argon introduced into the combustion pipe.

Based on the research of the applicant on the combustion behavior of the blast furnace gas for many years, the method of the invention generates a chemical reaction between combustible gas in the blast furnace gas and oxygen at the high temperature of 800-900 ℃, and the chemical reaction formula comprises:

2CO+O₂＝2CO₂；

2H₂+O₂＝2H₂O；

2H₂S+3O₂＝2SO₂+2H₂O；

CS₂+3O₂＝2SO₂+CO₂；

2COS+3O₂＝2SO₂+2CO₂；

according to the chemical reactions, the main components of waste gas generated after combustion in blast furnace gas comprise CO ₂, H ₂ O, SO ₂ and N ₂, and through orthogonal condition experimental study and detection, the applicant finds that the temperature of a combustion tube is controlled to be 800-900 ℃, the oxygen flow is 1.0-2.0L/min, the argon flow is 2.0-3.0L/min, and sulfides in the blast furnace gas are completely combusted and completely converted into sulfur dioxide, and finds that the temperature of the combustion tube is controlled to be 840-890 ℃, oxygen and argon are simultaneously introduced into the combustion tube in the combustion process of the blast furnace gas, the oxygen flow is 1.5-2.0L/min, the argon flow is 2.0-2.5L/min, and the effect is good.

The invention can completely combust various sulfur in blast furnace gas with oxygen under the condition of high temperature to generate sulfur dioxide under the reasonable control condition, and then the fluorescence integral response value of the sulfur is detected by an ultraviolet fluorescence detector to calculate the mass content of the sulfur in the blast furnace gas.

The method effectively solves the problem that the mass content of the sulfur in the blast furnace gas generated in the blast furnace ironmaking production can not be accurately detected, and provides data support for reutilization, tail gas emission treatment, environmental pollution control and the like in the blast furnace gas.

The method is also suitable for detecting the sulfur content in the coke oven gas and the converter gas.

Compared with the prior art, the invention has the following positive effects: 1. the method realizes accurate determination of the sulfur content in the blast furnace gas, has simple and convenient operation and low detection cost, and solves the problem that the sulfur in the blast furnace gas cannot be detected. 2. The method is suitable for detecting the sulfur content in blast furnace gas, coke oven gas and converter gas.

Detailed Description

The invention is further illustrated below with reference to example 1.