CN110376330B

CN110376330B - Device for simulating combustion environment of stable combustion improver

Info

Publication number: CN110376330B
Application number: CN201910634235.9A
Authority: CN
Inventors: 洪昊; 谢冬柏; 多树旺; 董阳
Original assignee: Jiangxi Science and Technology Normal University
Current assignee: Jiangxi Science and Technology Normal University
Priority date: 2019-07-15
Filing date: 2019-07-15
Publication date: 2023-05-12
Anticipated expiration: 2039-07-15
Also published as: CN110376330A

Abstract

One of the combustion environment devices for simulating the combustion of the stable combustion improver, which uses liquid fuel as energy to simulate the combustion of the combustion improver; the method is characterized in that: the liquid fuel is heated by a heating device (1) to be gasified and volatilized, the gaseous fuel is stored by a heat-preserving gas-collecting tank (2), and the flame which is stable to burn is obtained by a secondary heating device (3). In the invention, the following components are added: 1. the liquid level sensor 13 is arranged in front of the heat-preserving gas collection tank 2 to prevent the excessive liquid flow; 2. the inlet and outlet of the thermal-insulation gas collection tank 2 can be set according to the relative ratio of the density of the gasified fuel and the density of the air. The invention has excellent technical effect and excellent development prospect, and has great expected economic value and social value.

Description

Device for simulating combustion environment of stable combustion improver

Technical Field

The invention relates to criminal technology and material science, and particularly provides a device for simulating and stabilizing combustion environment of a combustion improver.

Background

In the prior art, the fire is a common criminal means and is also one of the reasons for the occurrence of fire. Most of the fire cases are hidden in common fires, and the nature of the fire can be determined only by surveying the fire scene and investigating the cause of the fire. However, the scene of the fire-setting case is complex, the fire-setting case is damaged by fire, the fire-setting case can be soaked by water during fire extinguishment, personnel entering the fire scene are damaged, and the extracted sample is very different from the pure product. And most of the combustion improver in the fire scene is easy to volatilize, and particularly, the light mineral oil has little residue in the fire scene, thereby bringing difficulty to the inspection and identification of the combustion improver in the combustible liquid residue in the fire scene.

For the identification of fire scene material evidence, the main method adopted at home and abroad at present is to detect whether flammable liquid with low unburned or excessive fire degree exists in fire scene residues. Based on the analysis, various analysis means are adopted for analysis. However, the use of this identification method is premised on a timely fire suppression, a less severe fire burn, and the extracted sample is required to be very pure and not contaminated, otherwise, the remaining flammable liquid components in the fire are not easily detected. However, fire sites are often damaged by oxidation, combustion, blisters and fire fighters, and the extracted samples are often contaminated. And most of the combustion improver in the fire scene is easy to volatilize, especially light mineral oil, and is difficult to find in the high-temperature environment of the fire scene. Conventional methods for determining the presence of a combustion improver in a fire scene by detecting the combustible liquid residue in the fire scene often encounter a number of difficulties in the process of inspection and identification.

The inventor researches and groups found that the metal material widely applied in the building field is generally nonflammable, but in the fire disaster environment, the metal material interacts with the combustion atmosphere of the surrounding environment to generate chemical reaction. Therefore, the relationship between the oxidizing atmosphere of different kinds of combustion promoters and the surface oxidation morphology after metal oxidation can be determined by simulating the combustion environments of different combustion promoters, and at present, the equipment for simulating the combustion environments of the combustion promoters is only closest to a gasification furnace, but the existing gasification furnace has the problem of unstable combustion temperature and cannot provide stable oxidation conditions for a long time. Therefore, for achieving the purpose of stable combustion, a device for simulating the combustion environment of a stable combustion improver is highly desired. So as to further develop related research work based on the related technology represented by the Chinese patent application document with the application number.

Disclosure of Invention

The invention aims to provide a combustion environment device for simulating and stabilizing a combustion improver, which has excellent technical effects.

The invention provides a combustion environment device for simulating and stabilizing a combustion improver, which uses liquid fuel as energy to simulate combustion of the combustion improver; the method is characterized in that: the liquid fuel is heated by a heating device 1, namely an electric heating coil, so that the liquid fuel is gasified and volatilized, a certain amount of gaseous fuel is stored by a heat preservation gas collection tank 2 after the liquid fuel is connected by a pipeline, the fuel ejection amount is kept stable by a secondary heating device 3 and a pressure stabilizing valve after the liquid fuel reaches a certain air pressure, and then the liquid fuel is ignited to obtain flame for stable combustion.

The invention relates to one of devices for simulating and stabilizing combustion environment of combustion improver, which is preferably provided with the following technical contents: the core devices in the heating device 1 and the secondary heating device 3 are electric heating coils; specifically, the core device in the heating device 1 is an electric heating coil a11; the core device in the secondary heating apparatus 3 is an electric heating coil B31.

Further preferred technical requirements are:

one, one of the simulated stable oxidizer combustion environment devices also meets one or a combination of the following requirements:

a liquid fuel supply source 4 is also arranged in one of the simulated stabilizer combustion environment devices, which is arranged upstream of the pipeline in the heating device 1; the fuel storage tank is specifically adopted; which is communicated with a heating device 1 through a connecting pipeline;

The heating device 1 is also provided with a temperature measuring element 12, a liquid level sensor 13 and a controller 14; wherein: the electric heating coil a11 is arranged outside the primary heating pipe 15 communicating with the liquid fuel supply source 4; the temperature measuring element 12 and the liquid level sensor 13 are arranged inside the primary heating pipeline 15; the liquid level sensor 13 is arranged at a pipeline at the outlet of the primary heating pipeline 15; the electric heating coil B31 is arranged outside the secondary heating pipe 32 communicating with the upstream air supply pipe; the secondary heating apparatus 3 is further provided with a pressure stabilizing unit 33 arranged at the outlet of the secondary heating pipe 32.

One of the simulated stabilizer combustion environment devices also meets one or a combination of the following requirements:

a sample hanging frame 8 is further arranged in one of the combustion environment simulation stabilizing combustion improver devices; which is arranged in the secondary heating apparatus 3 above the pressure stabilizing unit 33 downstream of the secondary heating pipe 32; the gasified fuel in the secondary heating pipeline 32 can keep the fuel injection amount stable after being stabilized by the downstream pressure stabilizing unit 33, and the flame which can be stably burnt can be obtained after the fuel is injected and directly acts on the sample rack 8;

an ignition switch 34 is arranged at a fuel ejection port 321 below the sample rack 8 and downstream of the pressure stabilizing unit 33 downstream of the secondary heating pipeline 32, and a windshield 322 is arranged at the periphery of the fuel ejection port 321;

A barometer A5 and a check valve A6 are also arranged in a pipeline communicated with the heat preservation and air collection tank 2 at the upstream of the secondary heating pipeline 32; wherein the check valve A6 is arranged upstream of the barometer A5;

a check valve B61 and a pump 21 are also arranged in a pipeline which is communicated with the heat preservation and gas collection tank 2 at the downstream of the primary heating pipeline 15; wherein: the pump 21 is arranged upstream of the check valve B61;

a check valve C62 is further provided on the line that communicates with the liquid fuel supply source 4 upstream of the primary heating line 15; a main valve switch 7 is also provided upstream of the check valve C62.

Secondly, the heating device 1 is constituted as follows: an electric heating coil A11, a temperature measuring element 12, a controller 14, an oil bath container 16, a bracket 17 and a container 18 for containing liquid combustion improver; wherein: the container 18 containing the liquid combustion improver is fixedly arranged on the bracket 17, so that the container 18 containing the liquid combustion improver can be arranged in the inner space of the oil bath container 16 in a suspending way and does not directly contact the oil bath container 16; the electric heating coil A11 is arranged outside the container 18 for containing the liquid combustion improver; both the electric heating coil a11 and the container 18 containing the liquid combustion improver are arranged in the oil bath oil in the oil bath container 16; the temperature measuring element 12 is arranged in the oil bath oil outside a container 18 containing liquid combustion improver in an oil bath container 16; the controller 14 is arranged outside the oil bath container 16, and the controller 14 is connected with the temperature measuring element 12; the inner cavity of the container 18 containing the liquid combustion improver is communicated with a pipeline, and a check valve B61 and a check valve C62 are respectively arranged on the pipeline at the downstream and the upstream.

The secondary heating apparatus 3 is replaced with a fuel flow controller 35, and the fuel flow controller 35 is constituted as follows: a movable valve 36 and a control panel 37; wherein: the movable valve 36 is disposed on the fuel line connected to the downstream fuel ejection port 321, and the control panel 37 is connected to the movable valve 36. A combustible addition accessory is also disposed near the fuel ejection port 321, and is constituted as follows: a combustible material nozzle 323 and a combustible material supply storage tank 324; wherein: the rear part of the combustible nozzle 323 is directly communicated with the combustible supply storage tank 324 or is communicated with the combustible supply storage tank 324 through a pipeline; the nozzle of the combustible nozzle 323 corresponds to the fuel ejection channel of the fuel ejection port 321, and the included angle between the axes is 5-45 degrees.

The device can also simulate whether the sample is oxidized in the flame or in the flame combustion atmosphere by setting different positions of the sample, because the flame is oxidized in the flameBoth the turbulence and the plasma in the flame affect the oxidation of the metallic material (flame turbulence promotes the peeling of the oxide layer, the plasma has good activity to accelerate the oxidation), and the combustion products (CO) are oxidized in the flame combustion atmosphere ₂ 、CO、H ₂ O, nitrogen oxides, C, etc.) are mostly oxidative products and have an influence on the formation and growth of oxide layers

The technical contents of other to-be-exchanged in the invention are as follows:

the liquid fuel supply source 4 may specifically be a fuel storage tank: for storing common liquid fuels such as absolute ethanol, gasoline, acetone, and the like;

total valve switch 7: for controlling the flow rate of the liquid fuel;

check valves everywhere: for preventing backflow of the gasified gas; restricting flow in only one direction; while preventing air backflow, the device is provided with a plurality of check valves to ensure unidirectional gas flow

An electric heating coil: a temperature measuring element 12 (specifically a thermocouple) is arranged at the head and the tail of the heating coil, and the heating temperature of the electric heating coil can be controlled by combining the readings of the thermocouples according to different fuel gasification degrees; the device can be assembled in a controller 14, and the controller 14 can be integrated into a control panel;

thermal insulation gas collection tank 2: temporarily storing the vaporized fuel, while operating at a pressure greater than atmospheric pressure, and maintaining stability;

liquid level sensor 13: the opening of the main valve switch 7 is prevented from being too large, and liquid enters the pump 21 in front of the heat preservation and gas collection tank 2; because the gasified fuel stored in the heat-preserving and gas-collecting tank 2 can be stably discharged for combustion only when reaching stable pressure, the pressure in the heat-preserving and gas-collecting tank 2 is higher than the atmospheric pressure, and a pump 21 is needed to press the gasified fuel into the heat-preserving and gas-collecting tank 2;

Barometer A5: the gas fuel pressure in the heat preservation gas collection tank 2 can be conveniently observed;

secondary heating device 3: according to the past experience, the combustion instability of the gasifier is partly incomplete, and the secondary heating device 3 is arranged to fully gasify the fuel liquefied in the pipeline and the fuel completely gasified;

the voltage stabilizing unit 33 is specifically a voltage stabilizing table: stabilizing the output gas flow rate;

the liquid fuel is heated and volatilized by an electric heating coil A11 (different temperatures are set according to different boiling points of different fuels) and enters a heat preservation gas collection tank 2; judging whether the air pressure in the heat preservation and air collection tank 2 is suitable for stable combustion or not through an air pressure meter A5; a secondary heating device 3 is arranged in front of the final fuel injection port 321, i.e. the burner tip, from which the fuel is injected and burned; (because one of the reasons for flame instability is incomplete gasification according to past experience), further gasifying the fuel as needed; so as to ensure the combustion effect.

In the invention, the following components are added: 1. the liquid level sensor 13 is arranged in front of the heat-preserving gas collection tank 2 to prevent the excessive liquid flow; 2. the inlet and outlet of the thermal-insulation gas collection tank 2 can be set according to the relative ratio of the density of the gasified fuel and the density of the air. For some exemplary experimental examples, see fig. 5-26.

The invention has excellent technical effect and excellent development prospect. Compared with the heating device in the prior art, the invention is obviously different from other conventional burners (such as various energy engines) which consume various energy sources and convert the energy sources into heat energy to work; the technical purpose is to simulate the fire scene with combustion improver so as to obtain stable experimental analysis and verification conditions, and finally provide technical feasibility for criminal investigation analysis after fire disaster; the method provides a new technical route with operability for the related technology, fills the technical blank, has predictable and extremely huge social benefit and economic benefit, and is beneficial to the detection after the fire disaster and the technical analysis of China to enter a new development stage.

Drawings

The invention will be described in further detail with reference to the accompanying drawings and embodiments:

FIG. 1 is a schematic diagram of one of the apparatus for simulating a combustion environment for a stabilized oxidizer according to example 1;

FIG. 2 is a schematic diagram showing the construction principle of an alternative heating device 1 for primary heating according to embodiment 2;

FIG. 3 is a schematic diagram showing the construction principle of an alternative secondary heating apparatus 3 according to embodiment 2;

fig. 4 is a schematic diagram illustrating the principle constitution of a combustible addition accessory provided in the vicinity of the downstream fuel ejection port 321;

FIG. 5 is the EDS results (5 min) of the oxidized surface of Q235 steel in an ethanol combustion environment (gasifier);

FIG. 6 is the EDS results (10 min) of the oxidized surface of Q235 steel in an ethanol combustion environment (gasifier);

FIG. 7 is the EDS results (20 min) of the oxidized surface of Q235 steel in an ethanol combustion environment (gasifier);

FIG. 8 is the EDS results (30 min) of the oxidized surface of Q235 steel in an ethanol combustion environment (gasifier);

FIG. 9 is the EDS results (5 min) of an oxidized surface of pure copper in an ethanol combustion environment (gasifier);

FIG. 10 is the EDS results (10 min) of an oxidized surface of pure copper in an ethanol combustion environment (gasifier);

FIG. 11 is the EDS results (20 min) of an oxidized surface of pure copper in an ethanol combustion environment (gasifier);

FIG. 12 is the EDS results (30 min) of an oxidized surface of pure copper in an ethanol combustion environment (gasifier);

FIG. 13 is one of the temperature curves (5 min) measured multiple times at the same point around the gasifier flame;

FIG. 14 is one of the temperature curves (10 min) measured multiple times at the same point on the periphery of the gasifier flame;

FIG. 15 is a graph of one of the temperature profiles (20 min) measured multiple times at the same point on the periphery of the gasifier flame;

FIG. 16 is a graph of one of a plurality of measured temperature curves (30 min) at different points around the periphery of the gasifier flame;

FIG. 17 is a second graph (5 min) of temperature measurements taken multiple times at the same point around the gasifier flame;

FIG. 18 is a second graph (10 min) of temperature measurements taken multiple times at the same point around the gasifier flame;

FIG. 19 is a second graph of temperature measurements (20 min) taken multiple times at the same point around the gasifier flame;

FIG. 20 is a second graph (30 min) of temperature measurements taken multiple times at the same point around the gasifier flame;

FIG. 21 is a numerical simulation calculation result of temperature distribution at different heights in the gasifier during combustion (flow field simulation and research of the gasifier in the IGCC system, yuanyuan);

FIG. 22 is a graph (0.4 m/s) of one of the temperature fields (numerical simulation of combustion characteristics of hydrogen-loaded methane in micro-combustors, mechanical engineering report, xu Yiming, etc.) obtained by simulation for different fuel flow rates;

FIG. 23 is a graph showing two (0.5 m/s) temperature fields (numerical simulation of combustion characteristics of hydrogen-doped methane in micro-combustors, mechanical engineering report, xu Yiming, etc.) for different fuel flow rates obtained by simulation;

FIG. 24 is a graph showing three (0.6 m/s) temperature fields (numerical simulation of combustion characteristics of hydrogen-doped methane in micro-combustors, mechanical engineering report, xu Yiming, etc.) for various fuel flow rates obtained by simulation;

FIG. 25 is a graph of temperature profile (numerical simulation of a long flame burner, lanshen, industrial furnace) under full load conditions;

FIG. 26 is a graph of simulated temperature at a point.

Detailed Description

The reference numerals have the following meanings: the heating device 1, the electric heating coil A11, the temperature measuring element 12, the liquid level sensor 13, the controller 14, the primary heating pipeline 15, the oil bath container 16, the bracket 17 and the container 18 for containing the liquid combustion improver; a thermal insulation gas collection tank 2 and a pump 21; the secondary heating device 3, the electric heating coil B31, the secondary heating pipeline 32, the downstream fuel ejection port 321, the windshield 322, the voltage stabilizing unit 33 and the ignition switch 34; a combustible nozzle 323, a combustible supply storage tank 324, a fuel flow controller 35, a movable valve 36, a control panel 37; a liquid fuel supply source 4, a barometer A5, a check valve A6, a check valve B61, a check valve C62, a main valve switch 7; and a sample hanging frame 8.

FIGS. 21-26 are temperature curves for different distances of fuel in the furnace (boundary conditions: fuel CH4; inlet velocity: 80m/s; combustion vessel atmospheric pressure; results of temperature simulation at different heights after ignition are shown in the graph);

FIG. 25 is a graph showing the temperature field generated by a simulated long flame burner such as Lanshen, which burns after a set fuel flow rate, defining a fuel inlet velocity of 97.4m/s; FIG. 26 is a graph of simulated temperature at a point from the flame showing that the fuel injection is controlled to a certain level, and that high temperatures occur at the instant of ignition and then stabilize, similar to the results of the previous introduction. In summary, a substantially temperature-stable combustion curve can be obtained by stabilizing the injection amount of fuel.

Example 1

A combustion environment device for simulating and stabilizing combustion improver uses liquid fuel as energy to simulate combustion improver; the liquid fuel is heated by a heating device 1, namely an electric heating coil, so that the liquid fuel is gasified and volatilized, a certain amount of gaseous fuel is stored by a heat preservation gas collection tank 2 after the liquid fuel is connected by a pipeline, the fuel ejection amount is kept stable by a secondary heating device 3 and a pressure stabilizing valve after the liquid fuel reaches a certain air pressure, and then the liquid fuel is ignited to obtain flame for stable combustion. The core devices in the heating device 1 and the secondary heating device 3 are electric heating coils; specifically, the core device in the heating device 1 is an electric heating coil a11; the core device in the secondary heating apparatus 3 is an electric heating coil B31.

One of the simulated stabilizer combustion environment devices also meets the following combination of requirements:

the heating device 1 is also provided with a temperature measuring element 12, a liquid level sensor 13 and a controller 14; wherein: the electric heating coil a11 is arranged outside the primary heating pipe 15 communicating with the liquid fuel supply source 4; the temperature measuring element 12 and the liquid level sensor 13 are arranged inside the primary heating pipeline 15; the liquid level sensor 13 is arranged at a pipeline at the outlet of the primary heating pipeline 15;

The electric heating coil B31 is arranged outside the secondary heating pipe 32 communicating with the upstream air supply pipe; the secondary heating apparatus 3 is further provided with a pressure stabilizing unit 33 arranged at the outlet of the secondary heating pipe 32.

A sample hanging frame 8 is further arranged in one of the combustion environment simulation stabilizing combustion improver devices; which is arranged in the secondary heating apparatus 3 above the pressure stabilizing unit 33 downstream of the secondary heating pipe 32; the gasified fuel in the secondary heating pipeline 32 can keep the fuel injection amount stable after being stabilized by the downstream pressure stabilizing unit 33, and the flame which can be stably burnt can be obtained after the fuel is injected and directly acts on the sample rack 8; an ignition switch 34 is arranged at a fuel ejection port 321 below the sample rack 8 and downstream of the pressure stabilizing unit 33 downstream of the secondary heating pipeline 32, and a windshield 322 is arranged at the periphery of the fuel ejection port 321; a barometer A5 and a check valve A6 are also arranged in a pipeline communicated with the heat preservation and air collection tank 2 at the upstream of the secondary heating pipeline 32; wherein the check valve A6 is arranged upstream of the barometer A5; a check valve B61 and a pump 21 are also arranged in a pipeline which is communicated with the heat preservation and gas collection tank 2 at the downstream of the primary heating pipeline 15; wherein: the pump 21 is arranged upstream of the check valve B61; a check valve C62 is further provided on the line that communicates with the liquid fuel supply source 4 upstream of the primary heating line 15; a main valve switch 7 is also provided upstream of the check valve C62.

The secondary heating apparatus 3 is replaced with a fuel flow controller 35, and the fuel flow controller 35 is constituted as follows: a movable valve 36 and a control panel 37; wherein: the movable valve 36 is disposed on the fuel line connected to the downstream fuel ejection port 321, and the control panel 37 is connected to the movable valve 36.

A combustible addition accessory is also disposed near the fuel ejection port 321, and is constituted as follows: a combustible material nozzle 323 and a combustible material supply storage tank 324; wherein: the rear part of the combustible nozzle 323 is directly communicated with the combustible supply storage tank 324 or is communicated with the combustible supply storage tank 324 through a pipeline; the nozzle of the combustible nozzle 323 corresponds to the fuel ejection channel of the fuel ejection port 321, and the included angle between the axes is 5-45 degrees.

The device in this embodiment also simulates whether the sample is oxidized in the flame or in the flame combustion atmosphere by setting different positions of the sample, because the flame turbulence of oxidizing the sample in the flame and the plasma in the flame both affect the oxidation of the metal material (the flame turbulence promotes the peeling of the oxide layer, the plasma has good activity to accelerate the oxidation), and the combustion products (CO ₂ 、CO、H ₂ O, nitrogen oxides, C, etc.) are mostly oxidative products and have an influence on the formation and growth of oxide layers

The other technical contents to be exchanged in this embodiment are as follows:

Total valve switch 7: for controlling the flow rate of the liquid fuel. Check valves everywhere: for preventing backflow of the gasified gas; restricting flow in only one direction; at the same time, the air backflow is prevented, and the purpose of the device is to ensure the unidirectional flow direction of the air by arranging a plurality of check valves. An electric heating coil: a temperature measuring element 12 (specifically a thermocouple) is arranged at the head and the tail of the heating coil, and the heating temperature of the electric heating coil can be controlled by combining the readings of the thermocouples according to different fuel gasification degrees; the device may be incorporated into a controller 14, and the controller 14 may be integrated into a control panel. Thermal insulation gas collection tank 2: the vaporized fuel is temporarily stored, is at a pressure greater than atmospheric pressure during operation, and remains stable. Liquid level sensor 13: the opening of the main valve switch 7 is prevented from being too large, and liquid enters the pump 21 in front of the heat preservation and gas collection tank 2; since the vaporized fuel stored in the thermal-insulation gas collection tank 2 is required to reach a stable pressure to be stably discharged for combustion, the pressure in the thermal-insulation gas collection tank 2 is higher than the atmospheric pressure, and therefore, a pump 21 is required to press the vaporized fuel into the thermal-insulation gas collection tank 2. Barometer A5: the gas fuel pressure in the heat preservation gas collection tank 2 is convenient to observe. Secondary heating device 3: according to the past experience, the reason that the combustion of the gasification furnace is unstable is partly incomplete gasification, and the secondary heating device 3 is arranged in the equipment to fully gasify the fuel liquefied in the pipeline and the fuel completely gasified. The voltage stabilizing unit 33 is specifically a voltage stabilizing table: stabilizing the output gas flow rate.

In this embodiment: 1. the liquid level sensor 13 is arranged in front of the heat-preserving gas collection tank 2 to prevent the excessive liquid flow; 2. the inlet and outlet of the thermal-insulation gas collection tank 2 can be set according to the relative ratio of the density of the gasified fuel and the density of the air.

Some examples of relevant typical experiments based on this embodiment are shown in fig. 5-26. The embodiment has excellent technical effect and excellent development prospect, and has great expected economic value and social value.

Example 2

A combustion environment device for simulating and stabilizing combustion improver uses liquid fuel as energy to simulate combustion improver; the liquid fuel is heated by a heating device 1, namely an electric heating coil, so that the liquid fuel is gasified and volatilized, a certain amount of gaseous fuel is stored by a heat preservation gas collection tank 2 after the liquid fuel is connected by a pipeline, the fuel ejection amount is kept stable by a secondary heating device 3 and a pressure stabilizing valve after the liquid fuel reaches a certain air pressure, and then the liquid fuel is ignited to obtain flame for stable combustion.

In the device for simulating and stabilizing combustion environment of combustion improver, which is disclosed in the embodiment: the core devices in the heating device 1 and the secondary heating device 3 are electric heating coils; specifically, the core device in the heating device 1 is an electric heating coil a11; the core device in the secondary heating apparatus 3 is an electric heating coil B31.

The heating device 1 is constituted as follows: an electric heating coil A11, a temperature measuring element 12, a controller 14, an oil bath container 16, a bracket 17 and a container 18 for containing liquid combustion improver; wherein: the container 18 containing the liquid combustion improver is fixedly arranged on the bracket 17, so that the container 18 containing the liquid combustion improver can be arranged in the inner space of the oil bath container 16 in a suspending way and does not directly contact the oil bath container 16;

the electric heating coil A11 is arranged outside the container 18 for containing the liquid combustion improver; both the electric heating coil a11 and the container 18 containing the liquid combustion improver are arranged in the oil bath oil in the oil bath container 16; the temperature measuring element 12 is arranged in the oil bath oil outside a container 18 containing liquid combustion improver in an oil bath container 16; the controller 14 is arranged outside the oil bath container 16, and the controller 14 is connected with the temperature measuring element 12;

the inner cavity of the container 18 containing the liquid combustion improver is communicated with a pipeline, and a check valve B61 and a check valve C62 are respectively arranged on the pipeline at the downstream and the upstream.

Other main matters of this embodiment are substantially the same as those of embodiment 1, and are omitted here.

Example 3

A combustion environment device for simulating and stabilizing combustion improver uses liquid fuel as energy to simulate combustion improver; the method is characterized in that: the liquid fuel is heated by a heating device 1, namely an electric heating coil, so that the liquid fuel is gasified and volatilized, a certain amount of gaseous fuel is stored by a heat preservation gas collection tank 2 after the liquid fuel is connected by a pipeline, the fuel ejection amount is kept stable by a secondary heating device 3 and a pressure stabilizing valve after the liquid fuel reaches a certain air pressure, and then the liquid fuel is ignited to obtain flame for stable combustion.

In the device for simulating and stabilizing combustion environment of combustion improver, core equipment in the heating device 1 and the secondary heating device 3 are electric heating coils; specifically, the core device in the heating device 1 is an electric heating coil a11; the core device in the secondary heating apparatus 3 is an electric heating coil B31.

An ignition switch 34 is arranged at a fuel ejection port 321 below the sample rack 8 and downstream of the pressure stabilizing unit 33 downstream of the secondary heating pipeline 32, and a windshield 322 is arranged at the periphery of the fuel ejection port 321; a barometer A5 and a check valve A6 are also arranged in a pipeline communicated with the heat preservation and air collection tank 2 at the upstream of the secondary heating pipeline 32; wherein the check valve A6 is arranged upstream of the barometer A5; a check valve B61 and a pump 21 are also arranged in a pipeline which is communicated with the heat preservation and gas collection tank 2 at the downstream of the primary heating pipeline 15; wherein: the pump 21 is arranged upstream of the check valve B61; a check valve C62 is further provided on the line that communicates with the liquid fuel supply source 4 upstream of the primary heating line 15; a main valve switch 7 is also provided upstream of the check valve C62.

The following examples are selected from the metallic materials common in everyday life (pure copper, 6062 aluminum alloy, Q235 carbon steel, 304 stainless steel), the combustion promoters readily available in everyday life (ethanol, gasoline, kerosene) and the combustibles common in fire fields (paper, cotton, plastic):

Example 4 (oxidation behavior of pure copper in the fire scene of ethanol Combustion improver)

Ethanol is used as a fuel to simulate combustion improver for combustion, pure copper which is common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valve behind the heat preservation gas collection tank is closed, and a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2 to reach a certain degreeAfter air pressure, the fuel injection quantity is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the fuel is ignited to obtain stable combustion ethanol flame. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and a large amount of CO is contained in the flame due to the easily-oxidized property of the pure copper and the combustion of ethanol ₂ ，H ₂ O _(g) The presence of CO, which is an oxidizing gas, further enhances the oxidation of copper, oxidation and exfoliation of pure copper surfaces, and the flow of gas around the sample caused by combustion also enhances the exfoliation of the oxide layer, and the morphology of the oxide presents a dense network structure, while the sample surfaces all present carbon deposits, which are associated with incomplete combustion of ethanol. These oxidation characteristics can be used as a reference point for determining whether an ethanol combustion improver is present in a fire scene.

Example 5 (oxidation behavior of pure copper in a fire scene where ethanol combustion improver and combustibles (paper, cotton, plastics) are present)

Ethanol is used as a fuel to simulate combustion improver for combustion, pure copper which is common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, after a certain air pressure is reached, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the ignition is carried out, so that stable burning ethanol flame is obtained. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not directly contacted with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and meanwhile, the sample is arranged around the burner tip The powder of paper, cotton cloth and plastic is placed in the combustible material adding accessory, and the powder is sprayed out at a certain speed while being burnt, and the powder is mixed and burnt. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the S and N oxides and the harmful substances such as benzene ring compounds, HCl, phenols, aldehydes and the like are oxide products, so that the oxidation of copper is further promoted, and the oxidation of copper is promoted due to the property of pure copper which is easy to oxidize and the existence of a large amount of oxidizing substances in flame for burning combustible substances such as ethanol, paper, cotton cloth and plastics, which is necessary to aggravate the oxidation of copper, the oxidation state of copper can be estimated within the same time according to the content of the oxidizing substances in the oxidation products, and carbon deposition on the surface of a sample is increased along with the increase of carbon chains of the combustible substances. These oxidation characteristics can be used as reference points for judging whether the alcohol combustion improver and combustible substances exist in the fire scene.

Example 6 (oxidation behavior of 6062 aluminum alloy in fire scene Environment of ethanol Combustion improver)

Ethanol is used as a fuel to simulate combustion improver for combustion, 6062 aluminum alloy which is common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valves behind the heat preservation and collection tank are closed, and heat preservation and collection are carried outThe gas tank 2 stores a certain amount of gaseous fuel, after reaching a certain air pressure, the fuel injection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the fuel is ignited to obtain stable burning ethanol flame. The 6062 aluminum alloy sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and because the 6062 aluminum alloy is easy to oxidize and easily form a compact oxide film, mechanical polishing treatment is carried out before an experiment to reduce experimental variables. The flame of ethanol combustion has a large amount of CO ₂ ，H ₂ O _(g) The presence of CO, both of which are oxidizing gases, further exacerbates the oxidation of the aluminum alloy. The aluminum alloy forms a dense oxide layer in a natural state, and numerous oxidizing components promote the formation of the oxide layer in an atmosphere in which ethanol burns. At the same time, there is also carbon deposition on the sample surface due to incomplete combustion of ethanol. These oxidation characteristics can be used as a reference point for determining whether an ethanol combustion improver is present in a fire scene.

Example 7 (oxidation behavior of 6062 aluminum alloy in fire scene Environment where ethanol Combustion improver and combustible materials paper, cotton, plastics exist)

Ethanol is used as a fuel to simulate combustion improver for combustion, 6062 aluminum alloy which is common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, after a certain air pressure is reached, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the ignition is carried out, so that stable burning ethanol flame is obtained. The 6062 aluminum alloy sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, and the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not directly connected The method comprises the steps of touching flame, wherein the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and simultaneously placing powder of paper, cotton cloth and plastic in a combustible material adding accessory around a burner tip, spraying at a certain speed while burning, and mixing and burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ， H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the oxides of S and N contain benzene ring compounds, HCl, phenols, aldehydes and other harmful substances, and the products are oxide products, so that the oxidation of 6062 aluminum alloy is further promoted, and due to the extremely easy oxidation property of 6062 aluminum alloy and the existence of a large amount of oxidizing substances in flame of ethanol, paper, cotton cloth and plastic which are burnt by combustible substances, the formation of an oxidation layer of 6062 aluminum alloy is promoted, the oxidation state and the thickness of the oxidation layer of 6062 aluminum alloy can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, and corrosive components in the oxidation product can possibly erode the compact oxidation layer of aluminum alloy, and carbon is deposited on the surface of a sample, and the carbon deposition is increased along with the increase of the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the alcohol combustion improver and combustible substances exist in the fire scene.

Example 8 (oxidation behavior of Q235 carbon Steel in fire scene Environment of ethanol Combustion improver)

Ethanol is used as a fuel to simulate combustion improver for combustion, Q235 carbon steel which is common in daily life is used as a simulated oxidation metal material, and a scanning electron microscope, an energy spectrometer, an atomic force microscope and an X-ray are usedAnalyzing the oxidation state of the surface of the sample by using diffractometer and other devices; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, after a certain air pressure is reached, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the ignition is carried out, so that stable burning ethanol flame is obtained. Q235 carbon steel samples are in a sheet shape of 2 x 10 x 20mm, holes are punched in the top of the samples for facilitating hanging of the samples, the samples are hung at a position 10cm above the vertical edge of a flame nozzle and are not in direct contact with flame, oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and mechanical polishing treatment is carried out on the Q235 carbon steel. The flame of ethanol combustion has a large amount of CO ₂ ，H2O _(g) The presence of CO, which are both oxidizing gases, further exacerbates the oxidation of Q235 carbon steel at ordinary elevated temperatures. The oxidation of the Q235 carbon steel in a natural state is more weight increment, the Q235 carbon steel has a weight loss trend in the preliminary exploration of the applicant, which is likely to be related to the gas flow around the sample to accelerate the peeling of an oxide layer, and the corrosion oxidation of the Q235 carbon steel is promoted because of the existence of a large amount of oxidizing atmosphere in combustion products, and the existence of ferrous ions in the ethanol combustion atmosphere promotes the formation of carbon nanotubes by ethanol combustion products. At the same time, there is also carbon deposition on the sample surface due to incomplete combustion of ethanol. These oxidation characteristics can be used as a reference point for determining whether an ethanol combustion improver is present in a fire scene.

Example 9 (oxidation behavior of Q235 carbon Steel in fire scene Environment where alcohol Combustion improver and combustible Material paper, cotton, plastics are present)

Ethanol is used as a fuel to simulate combustion improver for combustion, Q235 carbon steel which is common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, and the heating device is firstly opened All valves of the equipment are used for discharging the air in the equipment by the ethanol gas, then the valves behind the heat preservation gas collection tanks are closed, after the heat preservation gas collection tanks 2 store a certain amount of gaseous fuel, the fuel ejection amount is kept stable by the secondary heating device 3 and the pressure stabilizing valve after the air pressure reaches a certain air pressure, and then the ethanol flame with stable combustion is obtained by ignition. Q235 carbon steel sample is 2 x 10 x 20mm slice, and the top punches in order to conveniently hang the sample, and the sample hangs 10cm department above flame nozzle vertical edge department, does not directly contact flame, and oxidation time is 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min, 30min respectively, and place paper, cotton cloth, plastics's powder in the combustible material around the burner tip interpolation accessory simultaneously, spouts with certain speed when burning, mixed burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ， H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, S and N oxides, benzene-containing ring compounds, HCl, phenols, aldehydes and other harmful substances are contained, and the products are oxide products, so that the oxidation of the Q235 carbon steel can be further promoted, and meanwhile, corrosive products generated by the combustion of combustible substances can also have an erosion effect on the Q235 carbon steel, so that the corrosion is accelerated. The oxidation state, the thickness of an oxide layer and the weight loss degree of the Q235 carbon steel can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, carbon is deposited on the surface of a sample, and the carbon deposition is increased along with the increase of the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the alcohol combustion improver and combustible substances exist in the fire scene.

Example 10 (oxidation behavior of 304 stainless Steel in fire scene Environment of ethanol Combustion improver)

Ethanol is used as a fuel to simulate combustion improver for combustion, 304 stainless steel common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to enable ethanol gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, after a certain air pressure is reached, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the ignition is carried out, so that stable burning ethanol flame is obtained. The 304 stainless steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and the 304 stainless steel is subjected to mechanical polishing treatment. The flame of ethanol combustion has a large amount of CO ₂ ，H ₂ O _(g) The presence of CO, which are all oxidizing gases, is less susceptible to oxidation than in the normal environment of 304 stainless steel, but oxidation occurs more readily in the environment with an oxidizing atmosphere than in the normal environment. At the same time, there is also carbon deposition on the sample surface due to incomplete combustion of ethanol. These oxidation characteristics can be used as a reference point for determining whether an ethanol combustion improver is present in a fire scene.

Example 11 (oxidation behavior of 304 stainless Steel in fire scene Environment where alcohol Combustion improver and combustible Material paper, cotton, plastics are present)

Ethanol is used as a fuel to simulate combustion improver for combustion, 304 stainless steel common in daily life is used as a simulated oxidation metal material, and equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like is used for analyzing the oxidation state of the surface of the sample; because ethanol is very volatile, the heating device adopts water bath or oil bath, the heating temperature is 70-80 ℃, all valves of the equipment are firstly opened to allowThe ethanol gas discharges the air in the equipment, then the valve behind the heat preservation gas collection tank is closed, after the heat preservation gas collection tank 2 stores a certain amount of gaseous fuel, the fuel spraying amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the air pressure reaches a certain air pressure, and then the air is ignited to obtain stable burning ethanol flame. The 304 stainless steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, meanwhile, powder of paper, cotton cloth and plastic is placed in a combustible material adding accessory around the burner tip, and the powder is sprayed out at a certain speed while being combusted, and mixed and combusted. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, S and N oxides and harmful substances such as benzene ring compounds, HCl, phenols, aldehydes and the like are contained, and the products are oxide products, so that the oxidation of 304 stainless steel can be further promoted, and meanwhile, corrosive products generated by the combustion of combustible substances can also have an erosion effect on a protective oxide layer of 304 stainless steel, so that the corrosion is accelerated. The oxidation state of 304 stainless steel, the damage degree of protective oxide layer and the like can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, carbon is deposited on the surface of the sample, and the carbon deposition is increased along with the increase of the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the alcohol combustion improver and combustible substances exist in the fire scene.

Example 12 (oxidation behavior of pure copper in a fire scene of a gasoline Combustion improver)

Using gasoline as a fuel to simulate combustion improver for combustion, using pure copper common in daily life as a simulated oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of the sample; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not directly contacted with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and the pure copper is subjected to mechanical polishing treatment. The heating value of gasoline combustion is high, the heating temperature of a sample at a copper position is higher, and meanwhile, a large amount of CO is contained in flame of gasoline combustion ₂ ，H ₂ O _(g) The presence of CO, N oxides, S oxides, and also some organics, which are oxidizing gases, is more severe than oxidation in the ethanol combustion environment, and the high heat generated by combustion also exacerbates the oxidation of pure copper to some extent. At the same time, the surface of the sample can be deposited with carbon, and the carbon deposited on the surface of the sample is unnecessary in an ethanol combustion environment because the carbon chain of gasoline is longer than that of ethanol. These oxidation characteristics can be used as a reference point for judging whether a gasoline combustion improver exists in a fire scene.

Example 13 (oxidation behavior of pure copper in a fire scene where gasoline combustion improver and combustibles (paper, cotton, plastics) are present)

The gasoline is used as a fuel to simulate combustion improver for combustion, the pure copper which is common in daily life is used as a simulated oxidation metal material, and a scanning electron microscope and an energy spectrometer are usedAnalyzing the oxidation state of the surface of the sample by using equipment such as an atomic force microscope, an X-ray diffractometer and the like; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, meanwhile, powder of paper, cotton cloth and plastic is placed in a combustible material adding accessory around the burner tip, and the powder is sprayed out at a certain speed while being combusted, and mixed and combusted. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ， H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, S and N oxides, benzene-containing ring compounds, HCl, phenols, aldehydes and other harmful substances are also included, and these products are oxide products, which further aggravate the content of oxides produced by gasoline combustion, and this can further promote copper oxidation, and because of the nature of easy oxidation of pure copper itself and the existence of a large amount of oxidizing substances in the flame of gasoline and combustibles such as paper, cotton cloth and plastics, this will tend to aggravate copper oxidation, according to the content of oxidizing substances in the oxidized productsIt is assumed how much copper is oxidized at the same time, carbon is deposited on the surface of the sample, and carbon deposition increases with the increase of the carbon chain of the combustible. These oxidation characteristics can be used as reference points for judging whether the alcohol combustion improver and combustible substances exist in the fire scene.

Example 14 (oxidation behavior of 6062 aluminum alloy in a fire scene Environment of a gasoline Combustion improver)

Using gasoline as a fuel to simulate combustion improver for combustion, using 6062 aluminum alloy which is common in daily life as a simulated oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The 6062 aluminum alloy sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and the 6062 aluminum alloy is subjected to mechanical polishing treatment. The heating value of gasoline combustion is high, the heating temperature of a sample at the same position is higher, and meanwhile, a large amount of CO is contained in flame of gasoline combustion ₂ ，H ₂ O _(g) The presence of CO, N oxides, S oxides, and some organic species, all of which are oxidizing gases, is more severe than oxidation in an ethanol combustion environment, and the high heat generated by combustion also to some extent exacerbates the oxidation of 6062 aluminum alloy, which forms a dense oxide layer in its natural state, and numerous oxidizing components promote the formation of an oxide layer in the gasoline combustion atmosphere. At the same time, the surface of the sample can be deposited with carbon, and the carbon chain of the gasoline is longer than that of the ethanolCarbon deposited on the surface of the product is in excess of the ethanol combustion environment. These oxidation characteristics can be used as a reference point for determining whether an ethanol combustion improver is present in a fire scene.

Example 15 (oxidation behavior of 6062 aluminum alloy in a fire scene Environment where gasoline Combustion improver and combustible materials paper, cotton, plastics are present)

Using gasoline as a fuel to simulate combustion improver for combustion, using 6062 aluminum alloy which is common in daily life as a simulated oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. 6062 aluminum alloy sample is 2 x 10 x 20 mm's slice, and the top punches in order to conveniently hang the sample, and the sample hangs 10cm department above flame nozzle vertical edge department, does not directly contact flame, and oxidation time is 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min, 30min respectively, places paper, cotton cloth, plastics's powder in the combustible material around the burner tip interpolation accessory simultaneously, spouts with certain speed when burning, mixed burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S and N oxides, benzene ring compounds, HCl, phenols, aldehydes and other harmful substances, the products are oxide products, the content of oxides generated by combustion is further increased, the oxidation of 6062 aluminum alloy is further promoted, and due to the property that 6062 aluminum alloy is easy to oxidize and the existence of a large amount of oxidizing substances in flames of combustion of gasoline, paper, cotton cloth and plastics and the like, the oxidation of 6062 aluminum alloy is increased, meanwhile, the high heat generated by combustion also increases the oxidation of 6062 aluminum alloy to a certain extent, a compact oxide layer is formed by the aluminum alloy in a natural state, and the formation of the oxide layer and the erosion of the oxide layer are promoted by a plurality of oxidizing components in the combustion atmosphere of gasoline and combustible substances. At the same time, the surface of the sample is deposited with carbon, and the carbon deposited on the surface of the sample is more than in the ethanol combustion environment because the carbon chain of gasoline is longer than that of ethanol. Meanwhile, incomplete combustion of combustible substances can also cause carbon deposition, and the oxidation characteristics can be used as reference points for judging whether the gasoline combustion improver and the combustible substances exist in a fire scene.

Example 16 (oxidation behavior of Q235 carbon Steel in a fire scene Environment of a gasoline Combustion improver)

Using gasoline as a fuel simulation combustion improver for combustion, using Q235 carbon steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The Q235 carbon steel sample is in a sheet shape of 2 x 10 x 20mm, the top punch is used for conveniently hanging the sample, and the sample is hung 10cm above the vertical edge of the flame nozzle and is not straightAnd (3) connecting a contact flame, wherein the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and performing mechanical polishing treatment on the Q235 carbon steel. The heating value of gasoline combustion is high, the heating temperature of a sample at the same position is higher, and meanwhile, a large amount of CO is contained in flame of gasoline combustion ₂ ，H ₂ O _(g) The method has the advantages that the method is characterized in that compared with the method in an ethanol combustion environment, the method has the advantages that the method is more severe, the organic matters generated by gasoline combustion can also have corrosion effect on a sample to a certain extent, meanwhile, the high heat generated by combustion can also exacerbate the oxidation of Q235 carbon steel to a certain extent, the gas flow around the sample due to temperature change can also have stripping effect on an oxidation layer, meanwhile, because incomplete combustion of gasoline can deposit carbon on the surface of the sample, the carbon deposit content is related to the carbon chain length of the combustible matters, and the characteristics are different from that of the method in common air, and can be used as a reference point for judging whether the gasoline combustion improver exists in a fire scene.

Example 17 (oxidation behavior of Q235 carbon Steel in a fire scene Environment where gasoline Combustion improver and combustible materials paper, cotton, plastics are present)

Using gasoline as a fuel simulation combustion improver for combustion, using Q235 carbon steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The Q235 carbon steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, and the oxidation time is 0 respectively 5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, placing powder of paper, cotton cloth and plastic in the combustible additive around the burner tip, spraying at a certain speed while burning, and mixing and burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S, N oxides, benzene-containing ring compounds, HCl, phenols, aldehydes and other harmful substances, and the products are oxide products, so that the content of oxides generated by gasoline combustion is further increased, the oxidation of Q235 carbon steel is further promoted, and meanwhile, corrosive products generated by combustible combustion also have erosion effects on Q235 carbon steel, so that corrosion is accelerated. At the same time, the gas flow around the sample due to temperature changes can also have a stripping effect on the oxide layer. The oxidation state, the thickness of an oxidation layer and the weight loss degree of the Q235 carbon steel can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, carbon is deposited on the surface of a sample, and the carbon deposition is increased along with the increase of the combustion improver and the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the gasoline combustion improver and combustible substances exist in the fire scene.

Example 18 (oxidation behavior of 304 stainless Steel in a fire scene Environment of a gasoline Combustion improver)

The sample table is analyzed by using gasoline as a fuel to simulate combustion improver, using 304 stainless steel common in daily life as a simulated metal oxide material, using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the likeA surface oxidation state; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The 304 stainless steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and the 304 stainless steel is subjected to mechanical polishing treatment. The heating value of gasoline combustion is high, the heating temperature of a sample at the same position is higher, and meanwhile, a large amount of CO is contained in flame of gasoline combustion ₂ ，H ₂ O _(g) CO, N oxides, S oxides, and also the presence of some organics, which are oxidizing gases, are more severe than oxidation in an ethanol combustion environment, are less susceptible to oxidation than in a normal environment for 304 stainless steel, but are more susceptible to oxidation in an oxidizing atmosphere than in a normal environment. The organics generated by the gasoline combustion also have a corrosive effect on the protective oxide layer formed by the 304 stainless steel sample to some extent, while the high heat generated by combustion also exacerbates the oxidation of 304 stainless steel to some extent. Meanwhile, because incomplete combustion of gasoline can deposit carbon on the surface of a sample, and the content of the carbon deposit is related to the carbon chain length of combustible matters, the characteristics are quite different from that of oxidation in common air, and the carbon deposit can be used as a reference point for judging whether a gasoline combustion improver exists in a fire scene.

Example 19 (oxidation behavior of 304 stainless Steel in a fire scene Environment where gasoline Combustion improver and combustible Material paper, cotton, plastics are present)

The gasoline is used as a fuel to simulate combustion improver for combustion, the 304 stainless steel common in daily life is used as a simulated oxidation metal material, and a scanning electron microscope is used to simulate combustion Analyzing the oxidation state of the surface of the sample by using a spectrometer, an atomic force microscope, an X-ray diffractometer and other devices; because gasoline is very volatile, the distillation range is 30-220 ℃, the heating device adopts water bath or oil bath, the heating temperature is 50-70 ℃, all valves of the equipment are firstly opened to enable gasoline gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tank are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the stable combustion gasoline flame is obtained after ignition. The 304 stainless steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, meanwhile, powder of paper, cotton cloth and plastic is placed in a combustible material adding accessory around the burner tip, and the powder is sprayed out at a certain speed while being combusted, and mixed and combusted. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S and N oxides, benzene-containing ring compounds, HCl, phenols, aldehydes and other harmful substances, and the products are oxide products, so that the content of oxides generated by gasoline combustion is further increased, the oxidation of 304 stainless steel is further promoted, and meanwhile, corrosive products generated by combustible combustion also have an erosion effect on a compact oxide layer formed by the 304 stainless steel, so that the corrosion of the 304 stainless steel is accelerated. Depending on how much of the content of oxidizing species in the oxidation productTo speculate that the oxidation state, the damage degree of the protective oxide layer, etc. of the 304 stainless steel are all deposited on the surface of the sample in the same time, and the carbon deposition is increased along with the increase of the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the gasoline combustion improver and combustible substances exist in the fire scene.

Example 20 (oxidation behavior of pure copper in a fire scene of kerosene Combustion improver)

Using kerosene as a fuel simulation combustion improver for combustion, using pure copper common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts a coil for heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valve behind the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after reaching a certain air pressure, and then the kerosene flame with stable combustion is obtained by ignition. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not directly contacted with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and the pure copper is subjected to mechanical polishing treatment. Kerosene is mainly a mixture of hydrocarbons with high boiling point of C11-C17 carbon atoms. The main component is saturated hydrocarbon, and also contains unsaturated hydrocarbon and aromatic hydrocarbon. The variety contains 28-48% of alkane, 20-50% or 8-15% of aromatic hydrocarbon, 1-6% of unsaturated hydrocarbon and 17-44% of cyclic hydrocarbon. The number of carbon atoms is 11-16. In addition, there are small amounts of impurities such as sulfides (mercaptans), gums, etc. Wherein the sulfur content is 0.04 to 0.10 percent. Free of benzene, diolefins and cracked fractions. The majority of the kerosene combustion products are therefore CO ₂ ，H ₂ O _(g) CO, and the like, also contain small amounts of oxides of N, S, which are all oxidizing gases, which are more dramatic than oxidation in an air or ethanol combustion environmentThe high heat generated by the simultaneous combustion also to some extent exacerbates the oxidation of pure copper. At the same time, the sample surface is deposited with carbon, and the carbon deposited on the sample surface is redundant to the ethanol combustion environment because the carbon chain of kerosene is longer than that of ethanol. These oxidation characteristics can be used as a reference point for judging whether kerosene combustion improver exists in a fire scene.

Example 21 (oxidation behavior of pure copper in a fire scene in the presence of kerosene combustion improver and combustibles (paper, cotton, plastics))

Using kerosene as a fuel simulation combustion improver for combustion, using pure copper common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is up to 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts coil heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valves after the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the kerosene flame with stable combustion is obtained by ignition. The pure copper sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, meanwhile, powder of paper, cotton cloth and plastic is placed in a combustible material adding accessory around the burner tip, and the powder is sprayed out at a certain speed while being combusted, and mixed and combusted. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc., except that since the cotton cloth is subjected to the coloring treatment,the combustion products also contain S oxides, N oxides, etc., and the products are relatively complex except for CO, CO because the plastics have large C chain length and molecular weight and contain a plurality of S, N and Cl functional groups ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S and N oxides, benzene ring compounds, HCl, phenols, aldehydes and other harmful substances, the products are oxide products, the content of oxides generated by combustion is further increased, the oxidation of copper is further promoted, the oxidation of copper is further increased due to the property that pure copper is easy to oxidize and the existence of a large amount of oxidizing substances in flames generated by combusting combustible substances such as kerosene, paper, cotton cloth and plastics, the oxidation of copper is necessarily increased, the oxidation state of copper in the same time can be estimated according to the content of the oxidizing substances in the oxidation products, meanwhile, carbon is deposited on the surface of a sample, and carbon deposition is also increased along with the increase of carbon chains of the combustible substances. These oxidation characteristics can be used as a reference point for judging whether kerosene combustion improver and combustible materials exist in a fire scene.

Example 22 (oxidation behavior of 6062 aluminum alloy in a fire scene Environment of kerosene Combustion improver)

Using kerosene as a fuel simulation combustion improver for combustion, using 6062 aluminum alloy which is common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts a coil for heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valve behind the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after reaching a certain air pressure, and then the kerosene flame with stable combustion is obtained by ignition. The 6062 aluminum alloy sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, and the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min and 10min,And (5) mechanically polishing the 6062 aluminum alloy for 20min and 30 min. Kerosene is mainly a mixture of hydrocarbons with high boiling point of C11-C17 carbon atoms. The main component is saturated hydrocarbon, and also contains unsaturated hydrocarbon and aromatic hydrocarbon. The variety contains 28-48% of alkane, 20-50% or 8-15% of aromatic hydrocarbon, 1-6% of unsaturated hydrocarbon and 17-44% of cyclic hydrocarbon. The number of carbon atoms is 11-16. In addition, there are small amounts of impurities such as sulfides (mercaptans), gums, etc. Wherein the sulfur content is 0.04 to 0.10 percent. Free of benzene, diolefins and cracked fractions. The majority of the kerosene combustion products are therefore CO ₂ ，H ₂ O _(g) CO, etc., also contains small amounts of N oxides, S oxides, which are all oxidizing gases, which are more severe than oxidation in an air or ethanol combustion environment, while the high heat generated by combustion also exacerbates the oxidation of 6062 aluminum alloy to some extent. The aluminum alloy forms a dense oxide layer in a natural state, and numerous oxidizing components promote the formation of the oxide layer in a kerosene combustion atmosphere. At the same time, the sample surface is deposited with carbon, and the carbon deposited on the sample surface is superfluous in the ethanol combustion environment because the carbon chain of kerosene is longer than that of ethanol. These oxidation characteristics can be used as a reference point for judging whether kerosene combustion improver exists in a fire scene.

Example 23 (oxidation behavior of 6062 aluminum alloy in fire scene Environment where kerosene combustion improver and combustible materials paper, cotton, plastics exist)

Using kerosene as a fuel simulation combustion improver for combustion, using 6062 aluminum alloy which is common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is up to 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts coil heating, the heating temperature is set to 300 ℃, all valves of the equipment are firstly opened to allow the kerosene gas to discharge the air in the equipment, then the valves after the heat-preserving gas-collecting tank is closed, a certain amount of gaseous fuel is stored in the heat-preserving gas-collecting tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after a certain air pressure is reached, and then the fuel is ignited Burning to obtain kerosene flame with stable combustion. 6062 aluminum alloy sample is 2 x 10 x 20 mm's slice, and the top punches in order to conveniently hang the sample, and the sample hangs 10cm department above flame nozzle vertical edge department, does not directly contact flame, and oxidation time is 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min, 30min respectively, places paper, cotton cloth, plastics's powder in the combustible material around the burner tip interpolation accessory simultaneously, spouts with certain speed when burning, mixed burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S and N oxides, benzene ring compounds, HCl, phenols, aldehydes and other harmful substances, the products are oxide products, the content of oxides generated by kerosene combustion is further increased, the oxidation of 6062 aluminum alloy is further promoted, and due to the property that 6062 aluminum alloy is easy to oxidize and the existence of a large amount of oxidizing substances in flames of the combustibles such as kerosene, paper, cotton cloth and plastics, the oxidation of 6062 aluminum alloy is increased, the oxidation of 6062 aluminum alloy is also increased to a certain extent due to high heat generated by combustion, a compact oxide layer is formed in a natural state of the aluminum alloy, and the formation of the oxide layer and the erosion of the oxide layer are promoted by a plurality of oxidizing components in the combustion atmosphere of kerosene and combustibles. At the same time, the surface of the sample is deposited with carbon, and the carbon deposited on the surface of the sample is unnecessary in an ethanol combustion environment because the carbon chain of kerosene is longer than that of ethanol. At the same time, incomplete combustion of combustible materials also causes carbon deposition These oxidation characteristics can be used as a reference point for judging whether kerosene combustion improver and combustible materials exist in a fire scene.

Example 24 (oxidation behavior of Q235 carbon Steel in a fire scene Environment of kerosene Combustion improver)

Using kerosene as a fuel simulation combustion improver for combustion, using Q235 carbon steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts a coil for heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valve behind the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after reaching a certain air pressure, and then the kerosene flame with stable combustion is obtained by ignition. Q235 carbon steel samples are in a sheet shape of 2 x 10 x 20mm, holes are punched in the top of the samples for facilitating hanging of the samples, the samples are hung at a position 10cm above the vertical edge of a flame nozzle and are not in direct contact with flame, oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, and mechanical polishing treatment is carried out on the Q235 carbon steel. Kerosene is mainly a mixture of hydrocarbons with high boiling point of C11-C17 carbon atoms. The main component is saturated hydrocarbon, and also contains unsaturated hydrocarbon and aromatic hydrocarbon. The variety contains 28-48% of alkane, 20-50% or 8-15% of aromatic hydrocarbon, 1-6% of unsaturated hydrocarbon and 17-44% of cyclic hydrocarbon. The number of carbon atoms is 11-16. In addition, there are small amounts of impurities such as sulfides (mercaptans), gums, etc. Wherein the sulfur content is 0.04 to 0.10 percent. Free of benzene, diolefins and cracked fractions. The majority of the kerosene combustion products are therefore CO ₂ ，H ₂ O _(g) CO and the like, and also contains a small amount of N oxide and S oxide, and the gases are oxidizing gases, which are more severe than oxidation in an ethanol combustion environment, and corrosive components such as the S oxide generated by kerosene combustion generate corrosive action on a sample to a certain extent, and high heat generated by combustion generates a certain extentThe oxidation of Q235 carbon steel is also aggravated, gas flow around the sample caused by temperature change can also have stripping action on an oxidation layer, meanwhile, carbon is deposited on the surface of the sample due to incomplete combustion of kerosene, the content of the deposited carbon is related to the carbon chain length of combustibles, and the characteristics are quite different from that of the oxidation in common air, and can be used as a reference point for judging whether the kerosene combustion improver exists in a fire scene.

Example 25 (oxidation behavior of Q235 carbon Steel in a fire scene Environment where kerosene combustion improver and combustible materials paper, cotton, plastics are present)

Using kerosene as a fuel simulation combustion improver for combustion, using Q235 carbon steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is up to 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts coil heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valves after the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after the certain air pressure is reached, and then the kerosene flame with stable combustion is obtained by ignition. Q235 carbon steel sample is 2 x 10 x 20mm slice, and the top punches in order to conveniently hang the sample, and the sample hangs 10cm department above flame nozzle vertical edge department, does not directly contact flame, and oxidation time is 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min, 30min respectively, and place paper, cotton cloth, plastics's powder in the combustible material around the burner tip interpolation accessory simultaneously, spouts with certain speed when burning, mixed burning. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, S and N oxides and harmful substances such as benzene ring compounds, HCl, phenols, aldehydes and the like are contained, and the products are oxide products, so that the content of oxides generated by kerosene combustion is further increased, the oxidation of Q235 carbon steel is further promoted, and meanwhile, corrosive products generated by the combustion of combustible substances also have erosion effects on the Q235 carbon steel, so that corrosion is accelerated. At the same time, the gas flow around the sample due to temperature changes can also have a stripping effect on the oxide layer. The oxidation state, the thickness of an oxidation layer and the weight loss degree of the Q235 carbon steel can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, carbon is deposited on the surface of a sample, and the carbon deposition is increased along with the increase of the combustion improver and the combustible carbon chain. These oxidation characteristics can be used as reference points for judging whether the gasoline combustion improver and combustible substances exist in the fire scene.

Example 26 (oxidation behavior of 304 stainless Steel in a fire scene Environment of kerosene Combustion improver)

Using kerosene as a fuel simulation combustion improver for combustion, using 304 stainless steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because the boiling point of kerosene is 175-325 ℃ and the volatilization degree is far less than that of ethanol and gasoline, the heating device adopts a coil for heating, the heating temperature is set to 300 ℃, all valves of the device are firstly opened to allow the kerosene gas to discharge the air in the device, then the valve behind the heat preservation gas collection tank is closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tank 2, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve after reaching a certain air pressure, and then the kerosene flame with stable combustion is obtained by ignition. 304 stainless steel sample is in the form of a sheet of 2 x 10 x 20mm, and the top is perforated to facilitate hanging the sample, which is hung on fireAnd (3) performing mechanical polishing treatment on the 304 stainless steel at the position 10cm above the vertical edge of the flame nozzle without directly contacting with flame, wherein the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30 min. Kerosene is mainly a mixture of hydrocarbons with high boiling point of C11-C17 carbon atoms. The main component is saturated hydrocarbon, and also contains unsaturated hydrocarbon and aromatic hydrocarbon. The variety contains 28-48% of alkane, 20-50% or 8-15% of aromatic hydrocarbon, 1-6% of unsaturated hydrocarbon and 17-44% of cyclic hydrocarbon. The number of carbon atoms is 11-16. In addition, there are small amounts of impurities such as sulfides (mercaptans), gums, etc. Wherein the sulfur content is 0.04 to 0.10 percent. Free of benzene, diolefins and cracked fractions. The majority of the kerosene combustion products are therefore CO ₂ ，H ₂ O _(g) CO, etc., also contains a small amount of N oxide, S oxide, which are all oxidizing gases, which are more severe than oxidation in an ethanol combustion environment, are less susceptible to oxidation than in a normal environment, but are more susceptible to oxidation in an environment with an oxidizing atmosphere than in a normal environment. The corrosive products produced by the combustion of kerosene also have a corrosive effect on the protective oxide layer formed by the 304 stainless steel sample, while the high heat generated by the combustion also exacerbates the oxidation of 304 stainless steel to some extent. Meanwhile, because the incomplete combustion of kerosene can deposit carbon on the surface of a sample, and the content of the carbon deposit is related to the carbon chain length of combustibles, the characteristics are quite different from that of the oxidation in common air, and can be used as a reference point for judging whether the kerosene combustion improver exists in a fire scene.

Example 27 (oxidation behavior of 304 stainless Steel in a fire scene Environment where kerosene Combustion improver and combustible materials paper, cotton, plastics are present)

Using kerosene as a fuel simulation combustion improver for combustion, using 304 stainless steel common in daily life as a simulation oxidation metal material, and using equipment such as a scanning electron microscope, an energy spectrometer, an atomic force microscope, an X-ray diffractometer and the like to analyze the oxidation state of the surface of a sample; because kerosene has a boiling point as high as 175-325 ℃ and a volatility much lower than that of ethanol and gasoline, the heating device adopts a coil for heating, the heating temperature is set to 300 ℃, Firstly, all valves of the equipment are opened to enable kerosene gas to discharge air in the equipment, then the valves behind the heat preservation gas collection tanks are closed, a certain amount of gaseous fuel is stored in the heat preservation gas collection tanks 2, after a certain air pressure is reached, the fuel ejection amount is kept stable through the secondary heating device 3 and the pressure stabilizing valve, and then the kerosene flame capable of burning stably is obtained. The 304 stainless steel sample is in a sheet shape of 2 x 10 x 20mm, the top punching is used for conveniently hanging the sample, the sample is hung at a position 10cm above the vertical edge of the flame nozzle and is not in direct contact with flame, the oxidation time is respectively 0.5min, 1min, 2min, 3min, 4min, 5min, 10min, 20min and 30min, meanwhile, powder of paper, cotton cloth and plastic is placed in a combustible material adding accessory around the burner tip, and the powder is sprayed out at a certain speed while being combusted, and mixed and combusted. Paper, cotton cloth and plastics are all common combustibles in family life, and if the combustibles are ignited by the combustion improver, the fire tends to increase, so that the simulation of the oxidation behavior of the metal material in the environment where the combustibles and the combustion improver exist simultaneously is of great significance. Because paper, cotton cloth and plastics are high molecular substances, the combustion products are mostly CO and CO ₂ ，H ₂ O _(g) Etc. are different in that the cotton cloth is colored, so that the combustion product also contains S oxide, N oxide, etc. and the plastics have large C chain length molecular weight and contain a plurality of S, N and Cl functional groups, so that the product is more complex except CO and CO ₂ ，H ₂ O _(g) Besides the conventional products, the products also contain S and N oxides, benzene ring compounds, HCl, phenols, aldehydes and other harmful substances, and the products are oxidative products, so that the content of the oxides generated by kerosene combustion is further increased, the oxidation of 304 stainless steel is further promoted, and meanwhile, corrosive products generated by combustible combustion also have an erosive effect on a compact oxide layer formed by the 304 stainless steel, so that the corrosion of the 304 stainless steel is accelerated. The oxidation state of 304 stainless steel, the damage degree of protective oxide layer and the like can be estimated in the same time according to the content of the oxidizing substances in the oxidation product, carbon is deposited on the surface of the sample, and the carbon deposition is increased along with the increase of the combustible carbon chain. These oxidation characteristics can be used asJudging whether a reference point exists for the existence of the kerosene combustion improver and the combustible matters in the fire scene.

Claims

1. A combustion environment device for simulating combustion of a stable combustion improver, which uses liquid fuel as energy to simulate combustion of the combustion improver; the method is characterized in that: firstly, a heating device (1) is used for heating liquid fuel to gasify and volatilize the liquid fuel, a pipeline is used for connecting the liquid fuel, then the gaseous fuel is stored by a heat preservation gas collection tank (2), and a secondary heating device (3) is used for obtaining flame for stable combustion;

The liquid fuels include ethanol, gasoline, and kerosene;

the core devices in the heating device (1) and the secondary heating device (3) are electric heating coils; specifically, the core equipment in the heating device (1) is an electric heating coil A (11); the core equipment in the secondary heating device (3) is an electric heating coil B (31);

the simulated stable combustion improver combustion environment device is also provided with a liquid fuel supply source (4) which is arranged at the upstream of a pipeline in the heating device (1); the fuel storage tank is specifically adopted; which is communicated with a heating device (1) through a connecting pipeline;

the heating device (1) is also provided with a temperature measuring element (12), a liquid level sensor (13) and a controller (14); wherein: the electric heating coil A (11) is arranged outside a primary heating pipeline (15) communicated with the liquid fuel supply source (4); the temperature measuring element (12) and the liquid level sensor (13) are arranged in the primary heating pipeline (15); the liquid level sensor (13) is arranged at a pipeline at the outlet of the primary heating pipeline (15); a check valve B (61) and a pump (21) are also arranged in a pipeline which is communicated with the heat preservation and gas collection tank (2) at the downstream of the primary heating pipeline (15); wherein: the pump (21) is arranged upstream of the check valve B (61); a check valve C (62) is also arranged on the pipeline which is communicated with the liquid fuel supply source (4) at the upstream of the primary heating pipeline (15); a main valve switch (7) is also arranged at the upstream of the check valve C (62);

Or alternatively, the first and second heat exchangers may be,

the heating device (1) is configured as follows: an electric heating coil A (11), a temperature measuring element (12), a controller (14), an oil bath container (16), a bracket (17) and a container (18) for containing liquid combustion improver; wherein: the container (18) for containing the liquid combustion improver is fixedly arranged on the bracket (17) and enables the container (18) for containing the liquid combustion improver to be arranged in the inner space of the oil bath container (16) in a suspending way and not directly contact with the oil bath container (16); the electric heating coil A (11) is arranged outside a container (18) for containing liquid combustion improver; the electric heating coil A (11) and the container (18) for containing the liquid combustion improver are arranged in the oil bath oil in the oil bath container (16); the temperature measuring element (12) is arranged in oil bath oil outside a container (18) for containing liquid combustion improver in the oil bath container (16); the controller (14) is arranged outside the oil bath container (16), and the controller (14) is connected with the temperature measuring element (12); the inner cavity of the container (18) for containing the liquid combustion improver is communicated with a pipeline, and a check valve B (61) and a check valve C (62) are respectively arranged on the pipeline at the downstream and the upstream;

the electric heating coil B (31) is arranged outside a secondary heating pipeline (32) communicated with the upstream air supply pipeline; the secondary heating device (3) is also provided with a pressure stabilizing unit (33) which is arranged at the outlet of the secondary heating pipeline (32);

The sample rack (8) is also arranged; which is arranged above a pressure stabilizing unit (33) in the secondary heating device (3) at the downstream of the secondary heating pipeline (32); the gasified fuel in the secondary heating pipeline (32) can be stabilized by a downstream stabilizing unit (33) to obtain stable burning flame, and the flame directly acts on the sample hanger (8); an ignition switch (34) is arranged at a fuel ejection port (321) below the sample rack (8) and downstream of the pressure stabilizing unit (33) downstream of the secondary heating pipeline (32), and a windshield (322) is arranged at the periphery of the fuel ejection port (321); a barometer A (5) and a check valve A (6) are also arranged in a pipeline communicated with the heat preservation and air collection tank (2) at the upstream of the secondary heating pipeline (32); wherein the check valve A (6) is arranged upstream of the barometer A (5).

2. A device for simulating a combustion environment for a stable combustion improver according to claim 1, wherein: the secondary heating device (3) is replaced by a fuel flow controller (35), and the fuel flow controller (35) is composed of the following components: a movable valve (36) and a control panel (37); wherein: the movable valve (36) is disposed on a fuel line connected to the downstream fuel discharge port (321), and the control panel (37) is connected to the movable valve (36).

3. A device for simulating a combustion environment for a stable combustion improver according to claim 1, wherein: a combustible addition fitting is also arranged near the fuel ejection port (321), and is composed of the following components: a combustible nozzle (323) and a combustible supply storage tank (324); wherein: the rear part of the combustible material nozzle (323) is directly communicated with the combustible material supply storage tank (324) or is communicated with the combustible material supply storage tank (324) through a pipeline; the nozzle of the combustible material nozzle (323) corresponds to the fuel spraying channel of the fuel spraying hole (321), and the included angle between the axes of the nozzle and the fuel spraying channel is 5-45 degrees.

4. A simulated stable combustion environment device as claimed in claim 2 wherein: a combustible addition fitting is also arranged near the fuel ejection port (321), and is composed of the following components: a combustible nozzle (323) and a combustible supply storage tank (324); wherein: the rear part of the combustible material nozzle (323) is directly communicated with the combustible material supply storage tank (324) or is communicated with the combustible material supply storage tank (324) through a pipeline; the nozzle of the combustible material nozzle (323) corresponds to the fuel spraying channel of the fuel spraying hole (321), and the included angle between the axes of the nozzle and the fuel spraying channel is 5-45 degrees.