Method for analyzing combustion products

Abstract

The invention relates to combustion product analysis, in particular to a method for combustion product analysis, and the specific structure of the method comprises a muffle furnace, a quartz glass tube, a heating wire, a gas source and an analysis instrument. According to the method, substances with different ignition points can be ignited, and then gas generated by combustion is introduced into an analysis instrument for detection. The method has the advantages of wide application range and simple operation.

Description

Technical Field

[0001] The present invention relates to combustion product analysis, in particular to a method for combustion product analysis, wherein the specific structure of the method comprises a muffle furnace, a quartz glass tube, a heating wire, a gas source and an analytical instrument. The method can ignite substances with different ignition points, and then introduce the gas generated by the combustion into an analytical instrument for detection. The method has the advantages of wide application range, simple operation and the like. Background Art

[0002] Combustion product analysis is a scientific and technical field that studies the chemical composition and characteristics of various gases, particles and harmful substances produced during the combustion process. During the combustion process, such as burning fossil fuels, wood, biomass or other combustible materials, a large amount of gases and particles are produced, including carbon dioxide, carbon monoxide, nitrogen oxides, sulfur oxides, volatile organic compounds, etc., as well as some incomplete combustion products, such as polycyclic aromatic hydrocarbons, heavy metals and other harmful substances.

[0003] Combustion product analysis is a study conducted to understand the characteristics of the combustion process, control combustion emissions and evaluate its environmental impact. It has a wide range of applications in environmental science, atmospheric science, energy science, engineering technology and other fields. By studying the composition and characteristics of combustion products, we can better understand the chemical reaction mechanism in the combustion process, optimize the combustion process to reduce pollutant emissions, and evaluate and monitor the impact on the environment and human health.

[0004] Commonly used techniques for modern combustion product analysis include mass spectrometry, chromatography, spectroscopy, mass spectrometry, etc. These methods can accurately measure the concentration of various gases and particulate matter, providing an important scientific basis for environmental protection and improving air quality. With the continuous development of technology, combustion product analysis will continue to contribute to the promotion of green environmental protection and sustainable energy utilization. Summary of the invention

[0005] The object of the present invention is to provide a combustion product analysis method which is simple and easy to operate.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A method for analyzing combustion products, the device used includes a gas source, a sampling glass tube, a sampling glass tube, and an analytical instrument; the sampling glass tube with two openings at both ends is formed by connecting two sections of pipelines with different inner diameters in series, a metal capillary with two openings at both ends is inserted into the section with a smaller inner diameter, one end of the metal capillary extends into the sampling glass tube, and the other end is connected to the sampling port of the analytical instrument; the middle part of the sampling glass tube (at the intersection of the section with a smaller inner diameter and the section with a larger inner diameter) is placed in a muffle furnace, the two opening ends are both located outside the muffle furnace, and an electric heating wire is wound around the outer wall surface of the section with a smaller inner diameter of the sampling glass tube outside the muffle furnace;

[0008] One end of the sampling glass tube with two openings is connected to the outlet of the gas source, and the other end is inserted into a section of the sampling glass tube with a larger inner diameter from the opening end of the side with a larger inner diameter; the characteristics are:

[0009] Take 1-5g of the combustion product sample to be tested and place it in the sampling glass tube 1-2cm away from the open end of the sampling glass tube to be inserted into the injection glass tube. Put a ball of glass wool into the open end of the sampling glass tube to seal it, so as to prevent the particles generated by combustion from flowing out of the sampling glass tube and contaminating the analytical instrument.

[0010] Then, one end of the sampling glass tube is inserted into the sampling glass tube nested in the muffle furnace near the intersection of two sections of pipelines with different inner diameters;

[0011] The other end of the sampling glass tube is connected to a gas source, and the sampling glass tube is connected to an analytical instrument via a metal capillary for detection.

[0012] The sampling glass tube with two open ends is formed by connecting two sections of pipelines with different inner diameters in series. The length of the sampling glass tube is 10-20cm, and the two ends have different diameters. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3mm-4mm (such as: 3mm or 4mm), and the inner diameter is 1.5-2mm, and the outer diameter of the thick end is 10-12mm, and the inner diameter is 8-10mm; the open end on the side with a larger inner diameter is inserted into the middle of the sampling glass tube, and the open end on the side with a smaller inner diameter is connected to the outlet of the gas source;

[0013] The length of the sampling glass tube is 10-20cm, and the two ends also have different diameters. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3mm-4mm (such as: 3mm or 4mm), and the inner diameter is 1.5-2mm. The outer diameter of the thick end is 14-16mm, and the inner diameter is 12-14mm.

[0014] The heating temperature range of the muffle furnace is 25-500℃; the ceramic heating coil (Huajian Electric Heating, 220V, 1400W) inside it is located in the center of the muffle furnace, and the diameter-changing position of the sample feeding glass tube (i.e. the intersection of two sections of pipelines with different inner diameters) is nested in the middle of the ceramic heating coil.

[0015] When analyzing the gas generated by combustion, the end of the sampling glass tube with a smaller diameter is connected to the gas source through an SMC gas pipe joint, and a Seven Star D07-19B mass flow controller is provided on the connecting pipeline to regulate the gas flow rate, which is 5-50 ml / min; the gas in the gas source is air and / or nitrogen.

[0016] A metal capillary with an outer diameter of 1 / 16 is inserted into the end of the injection glass tube with a smaller diameter for connecting to an analytical instrument for detection;

[0017] An electric heating wire is wound around the outer wall of the portion of the sample injection glass tube into which the metal capillary is inserted that extends out of the muffle furnace for heat preservation to reduce the adsorption of combustion products. The heat preservation temperature is 25-300°C.

[0018] The analytical instrument can be chromatography, mass spectrometry or ion mobility spectrometry.

[0019] The gas flow rate through the mass flow controller, the heating temperature of the muffle furnace, and the heating temperature of the heating wire are all set and read through the control computer.

[0020] This method can ignite substances with different ignition points in a muffle furnace, and then introduce the combustion gas into an analytical instrument for detection. It has the advantages of wide application range and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a method for combustion product analysis of the present invention;

[0022] Figure 2 Mass spectra of three types of heat-not-burn cigarette tobacco; DETAILED DESCRIPTION

[0023] See also Figure 1 , which is a schematic diagram of the structure of the present invention.

[0024] The device used includes a gas source 1, a sampling glass tube 4, a sampling glass tube 5, and an analytical instrument 12; the sampling glass tube 5 with two openings at both ends is formed by connecting two sections of pipelines with different inner diameters in series, and a metal capillary 11 with two openings at both ends is inserted into the section with a smaller inner diameter, one end of the metal capillary 11 extends into the sampling glass tube 5, and the other end is connected to the sampling port of the analytical instrument 12; the middle part of the sampling glass tube 5 (at the intersection of the section with a smaller inner diameter and the section with a larger inner diameter) is placed in a muffle furnace 6, and the two opening ends are located outside the muffle furnace 6, and an electric heating wire 10 is wound around the outer wall surface of the section with a smaller inner diameter of the sampling glass tube 5 outside the muffle furnace 6;

[0025] One end of the sampling glass tube 4 with two openings is connected to the outlet of the gas source 1, and the other end is inserted into a section of the sampling glass tube 5 with a larger inner diameter from the opening end of the side with a larger inner diameter;

[0026] Take 2g of the combustion product sample 8 to be tested and place it in the sampling glass tube 4, 1.5cm away from the open end of the sampling glass tube 4 to be inserted into the injection glass tube 5, and plug a ball of glass wool 9 into the open end of the sampling glass tube 4 to be inserted into the injection glass tube 5 to seal it, so as to prevent the particles generated by the combustion from flowing out of the sampling glass tube 4 and contaminating the analysis instrument 12;

[0027] Then, one end of the sampling glass tube 4 is inserted into the sampling glass tube 5 nested in the muffle furnace 6 near the intersection of two sections of pipelines with different inner diameters;

[0028] The other end of the sampling glass tube 4 is connected to the gas source 1, and the sampling glass tube 5 is connected to the analysis instrument 12 through the metal capillary 11 for detection.

[0029] The sampling glass tube 4 with two open ends is formed by connecting two sections of pipelines with different inner diameters in series. The sampling glass tube 4 is 20 cm long and has different diameters at both ends. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3 mm and the inner diameter is 1.5 mm, and the outer diameter of the thick end is 11 mm and the inner diameter is 9 mm. The open end on the side with a larger inner diameter is inserted into the middle of the sampling glass tube 5, and the open end on the side with a smaller inner diameter is connected to the outlet of the gas source 1.

[0030] The length of the injection glass tube 5 is 20 cm, and the two ends also have different diameters. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3 mm and the inner diameter is 1.5 mm, and the outer diameter of the thick end is 14 mm and the inner diameter is 12 mm.

[0031] The heating temperature of the muffle furnace 6 is 300°C; the ceramic heating coil (Huajian Electric Heating, 220V, 1400W) 7 therein is located at the center of the muffle furnace 6, and the diameter-changing position of the sample feeding glass tube 5 (i.e., the intersection of two sections of pipelines with different inner diameters) is nested in the middle of the ceramic heating coil 7.

[0032] When analyzing the gas generated by combustion, the end of the sampling glass tube 4 with a smaller diameter is connected to the gas source 1 through the SMC gas pipe joint 3, and a Seven Star D07-19B mass flow controller (2) is provided on the connecting pipeline to regulate the gas flow rate, and the gas flow rate is 20 ml / min; the gas in the gas source 1 is nitrogen.

[0033] A metal capillary 11 with an outer diameter of 1 / 16 is inserted into the end of the sample injection glass tube 5 with a smaller diameter for connecting to an analytical instrument 12 for detection;

[0034] The portion of the outer wall of the sample injection glass tube 5 into which the metal capillary 11 is inserted extending from the muffle furnace (6) is wrapped with an electric heating wire 10 for heat preservation to reduce the adsorption of combustion products. The heat preservation temperature is 200°C.

[0035] The analytical instrument used was mass spectrometry.

[0036] The gas flow rate through the mass flow controller 2 , the heating temperature of the muffle furnace 6 , and the heating temperature of the heating wire 10 are all set and read by the control computer 13 .

[0037] Example:

[0038] Using the above-mentioned sampling method and experimental conditions, the combustion components of 1g of Huanghelou brand heat-not-burn cigarette tobacco were analyzed at a muffle furnace heating temperature of 300°C. Figure 2 As shown in the mass spectrum, the substances detected mainly include nicotine, methylfurfural, dihydroxybenzene, ethylene, acetone, pyrrole, pyridine, benzene, toluene, xylene, ammonia, nitric oxide, methyl mercaptan, cyclopentene, methylfuran, aniline, phenol and other compounds.

Claims

1. A method for analyzing combustion products, the device used comprises a gas source (1), a sampling glass tube (4), a sampling glass tube (5), and an analytical instrument (12); the sampling glass tube (5) with two open ends is formed by connecting two sections of pipelines with different inner diameters in series, a metal capillary (11) with two open ends is inserted into the section with a smaller inner diameter, one end of the metal capillary (11) extends into the sampling glass tube (5), and the other end is connected to the sampling port of the analytical instrument (12); the middle part of the sampling glass tube (5) (at the intersection of the section with a smaller inner diameter and the section with a larger inner diameter) is placed in a muffle furnace (6), and the two open ends are both located outside the muffle furnace (6), and an electric heating wire (10) is wound around the outer wall surface of the section with a smaller inner diameter of the sampling glass tube (5) outside the muffle furnace (6); One end of the sampling glass tube (4) with two openings is connected to the outlet of the gas source (1), and the other end is inserted into a section of the sampling glass tube (5) with a larger inner diameter from the opening end on the side with a larger inner diameter; the characteristics are: 1-5 g of the combustion product sample (8) to be tested is placed in the sampling glass tube (4) at a distance of 1-2 cm from the open end of the sampling glass tube (4) to be inserted into the injection glass tube (5), and a ball of glass wool (9) is inserted into the open end of the sampling glass tube (4) to be inserted into the injection glass tube (5) to seal it, so as to prevent particles generated by combustion from flowing out of the sampling glass tube (4) and contaminating the analysis instrument (12); Then, one end of the sampling glass tube (4) is inserted into the sampling glass tube (5) nested in the muffle furnace (6) near the intersection of two sections of pipelines with different inner diameters; The other end of the sampling glass tube (4) is connected to the gas source (1), and the sampling glass tube (5) is connected to the analysis instrument (12) via the metal capillary (11) for detection.

2. The method according to claim 1, characterized in that: The sampling glass tube (4) with two open ends is formed by connecting two sections of pipelines with different inner diameters in series. The sampling glass tube (4) is 10-20 cm long and has different diameters at both ends. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3 mm-4 mm (e.g., 3 mm or 4 mm) and the inner diameter is 1.5-2 mm, and the outer diameter of the thick end is 10-12 mm and the inner diameter is 8-10 mm. The open end on the side with the larger inner diameter is inserted into the middle of the sampling glass tube (5), and the open end on the side with the smaller inner diameter is connected to the outlet of the gas source (1). The length of the injection glass tube (5) is 10-20 cm, and the two ends also have different diameters. The diameter changes in the middle of the glass tube. The outer diameter of the thin end is 3mm-4mm (such as: 3mm or 4mm) and the inner diameter is 1.5-2mm, and the outer diameter of the thick end is 14-16mm and the inner diameter is 12-14mm.

3. The method according to claim 1 or 2, characterized in that: The heating temperature range of the muffle furnace (6) is 25-500°C; the ceramic heating coil (Huajian Electric Heating, 220V, 1400W) (7) therein is located at the center of the muffle furnace (6), and the diameter-changing position of the sample feeding glass tube (5) (i.e., the intersection of two sections of pipelines with different inner diameters) is nested in the middle of the ceramic heating coil (7).

4. The method according to claim 1 or 2, characterized in that: When analyzing the gas generated by combustion, the end with a smaller diameter of the sampling glass tube (4) is connected to the gas source (1) through the SMC gas pipe joint (3), and a Seven Star D07-19B mass flow controller (2) is provided on the connecting pipeline to control the gas flow rate, and the gas flow rate is 5-50 ml / min; the gas in the gas source (1) is air and / or nitrogen.

5. The method according to claim 1 or 2, characterized in that: A metal capillary (11) with an outer diameter of 1 / 16 is inserted into the end of the sample injection glass tube (5) with a smaller diameter for connecting to an analytical instrument (12) for detection; An electric heating wire (10) is wound around the outer wall of the portion of the sample injection glass tube (5) into which the metal capillary (11) is inserted, which extends out from the muffle furnace (6) for heat preservation, so as to reduce the adsorption of combustion products, and the heat preservation temperature is 25-300°C.

6. The method according to claim 1, characterized in that: The analytical instrument (12) may be a chromatograph, a mass spectrometer or an ion mobility spectrometer.

7. The method according to claim 1, 4 or 5, characterized in that: The gas flow rate through the mass flow controller (2), the heating temperature of the muffle furnace (6), and the heating temperature of the heating wire (10) are all set and read through the control computer (13).

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