CN111965213A - System capable of automatically measuring self-heating tendency of accumulation body - Google Patents
System capable of automatically measuring self-heating tendency of accumulation body Download PDFInfo
- Publication number
- CN111965213A CN111965213A CN202010509644.9A CN202010509644A CN111965213A CN 111965213 A CN111965213 A CN 111965213A CN 202010509644 A CN202010509644 A CN 202010509644A CN 111965213 A CN111965213 A CN 111965213A
- Authority
- CN
- China
- Prior art keywords
- module
- self
- temperature
- heating
- serial port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 25
- 238000009825 accumulation Methods 0.000 title abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 28
- 239000010963 304 stainless steel Substances 0.000 claims abstract description 7
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000004913 activation Effects 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000009795 derivation Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- 230000002269 spontaneous effect Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000004880 explosion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000004463 hay Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
Abstract
The invention discloses a system capable of automatically measuring self-heating tendency strength of a stacking body, which comprises a 101-1B type oven capable of realizing temperature programming, a cylindrical metal mesh basket which is used for containing a test object and is made of 304 stainless steel and has the diameter of 12cm, a PT100 thermistor temperature sensor (4), a self-made singlechip which can carry out AD acquisition and serial port communication with a PC end, and software which can carry out operation control and real-time display of test data on the system. The device has the advantages of simple structure, easy operation and convenient acquisition of test data, solves the problem of complex operation steps for testing the self-heating tendency of the accumulation body, and has certain effect on forecasting the occurrence of spontaneous combustion fires.
Description
Technical Field
The invention relates to a system capable of automatically judging the self-heating tendency grade of a stacking body, in particular to a system capable of automatically measuring the self-heating tendency strength of the stacking body.
Background
Various chemicals appear in various fields in production and life, and meanwhile, the occurrence frequency and the damage degree of spontaneous combustion type fire accidents are higher and higher. Spontaneous combustion type fires and explosions are fires or explosions caused by the accumulation of reaction heat inside a substance, causing combustion. There are many chemicals that can spontaneously ignite when sufficient heat is accumulated, such as coal, hay, compost, etc. However, of all spontaneous combustion fires, the fires occurring in mines, particularly fires resulting from spontaneous combustion of coal, have a significant weight. In the important mines in coal mines in China, more than 56 percent of mines with spontaneous combustion fire risks exist. Of all mine fires, more than 90% are caused by spontaneous combustion of coal. In recent years, due to the development of scientific technology, the efficiency of coal mine production is greatly improved, but the phenomena of more residual coal left in a goaf and serious air leakage exist in a production field, so that the danger of mine fire is greatly increased, and the coal production and the development of a mine are seriously hindered. Generally, under certain conditions, most chemicals that are capable of exothermic reactions have the property of self-igniting heat. A fire or explosion phenomenon due to combustion is often caused by accumulation of reaction heat inside the material. If a system could be devised that automatically tests the level of self-heating propensity of a heap, it would be possible to predict the occurrence of a spontaneous combustion fire.
At present, preliminary research is carried out on the self-heating tendency of substances at home and abroad, and some mature self-heating prediction technologies are provided, but research objects are not wide enough, only certain research is carried out on coal and ore, the strength of the self-heating tendency of different kinds of substances cannot be judged, and the characteristic is not well applied to the practical application of fire prevention and explosion prevention. Although there are some mature techniques for predicting spontaneous combustion, these techniques have high cost, complicated apparatus and complicated operation, and can only be applied to large-scale production. And the instruments have larger volume and are not convenient and fast to measure.
Disclosure of Invention
The purpose of the invention is as follows: it is to reduce the possibility of fire or explosion in order to conveniently predict the occurrence of spontaneous combustion fire, and to make up for the deficiencies of the prior art.
In order to achieve the above object of the invention, the following techniques are adopted: based on the temperature cross-point method by obtaining Tc(temperature crossover point), TcObtained by placing a container containing the stack in a programmed oven, measuring the temperature of the centre of the container and the temperature of the interior of the container at the same level, and when the two temperatures are the same, the temperature is Tc. The experiment was repeated five times, each time setting a different temperature to be reached for the oven, resulting in five TscAnd finally, utilizing an oxidation kinetic equation:
to obtain
From which E can be derived by the slope and intercept, respectively, of the lineaAnd A. Finally by judging the apparent activation energy (E)a) The self-heating tendency of the stack is judged. The specific technical scheme is as follows:
a system capable of automatically measuring the self-heating tendency of a stacking body comprises a 101-1B type oven, a temperature sensor and a control module, wherein the oven is used for programming temperature to provide a temperature environment required by a test; the metal mesh basket is made of 304 stainless steel and is used for containing a test object; a PT100 thermistor temperature sensor for measuring temperature; the singlechip is used for carrying out AD acquisition and serial port communication with the PC end; and the control module is used for reading the data transmitted by the singlechip, carrying out operation control, data processing and real-time display of test data on the system, putting the metal basket into a 101-1B type oven for testing, fixing the PT100 thermistor temperature sensor with a corresponding point in the cylindrical metal basket, and simultaneously connecting with a corresponding interface on the singlechip, wherein the singlechip is connected with the control module.
Furthermore, the metal mesh basket is a cylindrical metal mesh basket with the high-temperature resistance, the aperture of the metal mesh basket is 100 meshes, and the diameter of the metal mesh basket is 12 cm.
Further, the singlechip is including using the STINK to download the procedure SWD module, UART1, AD acquisition module, reset circuit module that carry out serial communication, LED lamp module turn into 5V and 3.3V's mains voltage conversion module 12V, STM32RET6 chip, relay module.
Furthermore, the control module comprises an actual temperature processing module, a filtering module and a point-by-point derivation module, and an activation energy and self-heating tendency grade module, wherein the actual temperature processing module (including serial port configuration, serial port reading value display, real-time display of processed temperature value images, data processing, fitting image display, and activation energy display are included.
Drawings
FIG. 1 is a view of the overall connection structure of the present invention;
FIG. 2 is a schematic view of thermocouple and metal basket placement
FIG. 3 is an interface for operation of the system software;
FIG. 4 is an effect diagram of the results displayed on the operation interface after data processing;
FIG. 5 is a schematic diagram of hardware
FIG. 6 is a clapper diagram of hardware.
Detailed Description
The invention is further described below with reference to the accompanying drawings and test methods:
the invention has the following functions:
firstly, temperature data obtained through measurement of the thermistor temperature sensor can be displayed on an operation interface of a PC end in real time.
The system can calculate and process data of the measured temperature, and the process of data processing can be displayed on an operation interface.
And thirdly, the apparent activation energy of the tested stacking body can be obtained after the data are processed, the numerical value of the apparent activation energy is displayed in an operation interface, and a user can obtain the self-heating tendency of the stacking body according to the obtained apparent activation energy and the classification standard of the self-heating tendency.
Fourthly, the system has a self-protection function, and when the detected temperature is 180-200 ℃, the system gives an alarm at a low frequency; at the temperature of 200 ℃ and 220 ℃, the intermediate frequency alarm is carried out; and when the temperature is above 220 ℃, high-frequency alarm is carried out. When the temperature reaches 220 ℃, the cooling spray can be started.
The invention structurally comprises:
a. hardware (1) a 101-1B oven capable of programmed temperature. (2) The metal mesh basket is used for containing a test object and is made of 304 stainless steel and is cylindrical with the diameter of 12 cm. (3) The PT100 thermistor temperature sensor (4) can be used for AD acquisition and can be communicated with a self-made singlechip of a PC end serial port. (5) And the control module can perform operation control on the system and display the test data in real time.
b. And the display software is made of Labview graphic programming software and can display images and final test results in real time.
The use environment of the invention is as follows: the thermistor temperature sensor can be normally tested in the environment with the ambient temperature of-50 ℃ to 200 ℃. But the single chip microcomputer can not work at the ambient temperature of over 50 ℃.
As shown in fig. 1-6, the system for automatically measuring the self-heating tendency of a deposited body of the present invention comprises a 101-1B type oven 1 capable of programming temperature to provide a temperature environment required for a test, a cylindrical metal basket 2 made of 304 stainless steel for holding a test object and having a diameter of 12cm, a PT100 thermistor temperature sensor 3 for measuring temperature, a single chip 4 capable of performing AD acquisition and serial port communication with a PC end, and a control module 5 capable of reading data transmitted by the single chip, performing operation control on the system, processing data, and displaying the test data in real time. The metal basket 2 containing the tested object is placed into the oven 1 of 101-1B type capable of achieving temperature programming for testing, the PT100 thermistor temperature sensor 3 is fixed with a corresponding point in the corresponding metal basket 2 and is connected with a corresponding interface on the single chip microcomputer 4, the single chip microcomputer 4 has AD acquisition and serial port communication functions, and the single chip microcomputer 4 is connected with a control module 5 capable of carrying out operation control and real-time display of test data on the system.
The metal basket 2 is characterized in that: the manufacturing of the metal basket has certain requirements because the testing environment needs to be carried out under the condition of temperature programming to be higher than 100 ℃ and constant temperature. As the temperature rises, the surface and internal temperature of the test object also rises. When the test object accumulates heat and reaches its own auto-ignition threshold temperature, and there is a sufficient supply of oxygen, auto-ignition of the test object is likely to occur. According to the principle, a metal mesh basket with good oxygen circulation is selected as a container for containing the test object. In addition, the tested environment temperature is generally higher, and is above 100 ℃, therefore, the metal mesh basket should have the characteristic of high temperature resistance at the same time, and 304 stainless steel is used as the material for manufacturing the metal mesh basket because of better heat resistance. In order to ensure that the container has good oxygen gas circulation and the test object cannot easily leak out, a metal mesh basket with 100 meshes is finally selected by referring to the particle size of a common test object (the common mesh number is 35-100 meshes), and a cylindrical metal mesh basket with the diameter of 12cm is manufactured by using 304 stainless steel as a material.
The singlechip 3 capable of performing AD acquisition and communicating with the serial port of the PC end is characterized in that: the singlechip comprises a UART 142, an AD acquisition module 43, a reset circuit module 44, an LED lamp module 45, a power supply voltage conversion module 46, an STM32RET6 chip 47 and a relay module 48, wherein the UART module 41 can use STINK to download a program SWD, can carry out serial port communication, and can convert 12V into 5V and 3.3V. Unnecessary functions are removed, the size of the development board is reduced, and the whole circuit board is 55mm multiplied by 45mm in size, so that the portable test device is convenient to carry and test.
The software capable of carrying out operation control on the system and displaying the test data in real time is characterized in that: the software comprises a module for processing actual temperature 51, a filter module 52, a point-by-point derivation module 53, and a module for obtaining activation energy and self-heating tendency grade 54. The module 51 for obtaining the actual temperature through processing comprises serial port configuration, a serial port reading value display module, a processed temperature value image real-time display module, an activation energy and self-heating tendency grade obtaining module 54 for obtaining the activation energy and self-heating tendency grade display module comprises data processing and image fitting display, and the activation energy display module is used for obtaining the activation energy display.
The test method of the invention is as follows:
as shown in figure 1, all parts are connected according to the figure, a basket for containing an experimental object is placed in an oven, a thermistor temperature sensor and a metal basket are connected according to the figure 2, meanwhile, a thermistor is connected with a single chip microcomputer, the single chip microcomputer is connected with a PC (personal computer) end through a serial port, and an operation interface is opened to prepare for starting testing.
The oven was set to heat up to 150 ℃ at a constant rate, the system would begin to collect the temperature by clicking the start button on the operator interface, and the real-time temperature curve is shown in the "T-T diagram" in fig. 3.
The image of the "T-T map" is again filtered and the resulting image is displayed in the "fit" image of fig. 3, and the processed image is differentiated point-by-point and displayed in the "T-T map derivation" image of fig. 3.
The oven operation may be stopped by proceeding to a point where the same temperature can be found for channel 1 and channel 2 in fig. 2
The oven was set to ramp up to 160 deg.C, 170 deg.C, 180 deg.C, 190 deg.C, respectively, and the above operations after setting to 150 deg.C were repeated to obtain 5 points where the temperature of channel 1 and channel 2 were the same, and the derivative of channel 2 at this point.
The system will automatically read these five temperature identical points and their derivatives and display them on the operation interface of fig. 3, and after data processing, the obtained apparent activation energy will also be on the operation interface of fig. 3.
Claims (4)
1. A system capable of automatically measuring self-heating tendency of a stacking body comprises a 101-1B type oven (1) for providing a temperature environment required by a test by temperature programming; the metal mesh basket (2) is made of 304 stainless steel and is used for containing a test object; a PT100 thermistor temperature sensor (3) for measuring temperature; the singlechip (4) is used for carrying out AD acquisition and communicating with a serial port of the PC end; control module (5) for reading singlechip transmission data, to this system operation control, data processing and show test data in real time, its characterized in that: the metal basket (2) is placed into a 101-1B type oven (1) for testing, a PT100 thermistor temperature sensor (3) is fixed with a corresponding point in the cylindrical metal basket (2) and is connected with a corresponding interface on a singlechip (4) which is connected with a control module (5).
2. The system of claim 1, wherein the system is adapted to automatically measure the self-heating propensity of the stack: the metal basket (2) is a cylindrical metal basket with the high-temperature resistance, the aperture of the metal basket is 100 meshes, and the diameter of the metal basket is 12 cm.
3. The system of claim 1, wherein the system is adapted to automatically measure the self-heating propensity of the stack: the single chip microcomputer (3) comprises a STLINK downloading program SWD module (41), a UART1 (42) for serial port communication, an AD acquisition module (43), a reset circuit module (44), an LED lamp module (45), a power supply voltage conversion module (46) for converting 12V into 5V and 3.3V, an STM32RET6 chip (47) and a relay module (48).
4. The system of claim 1, wherein the system is adapted to automatically measure the self-heating propensity of the stack: the control module (5) comprises an actual temperature processing module (51), a filtering module (52) and a point-by-point derivation module (53), and an activation energy and self-heating tendency grade module (54) is obtained, wherein the actual temperature processing module (51) comprises serial port configuration, a serial port reads numerical value display, a processed temperature value image is displayed in real time, and the activation energy and self-heating tendency grade module (54) comprises data processing and fitting image display, so that activation energy display is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509644.9A CN111965213A (en) | 2020-06-05 | 2020-06-05 | System capable of automatically measuring self-heating tendency of accumulation body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509644.9A CN111965213A (en) | 2020-06-05 | 2020-06-05 | System capable of automatically measuring self-heating tendency of accumulation body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111965213A true CN111965213A (en) | 2020-11-20 |
Family
ID=73360263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010509644.9A Pending CN111965213A (en) | 2020-06-05 | 2020-06-05 | System capable of automatically measuring self-heating tendency of accumulation body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111965213A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206211A (en) * | 2007-12-18 | 2008-06-25 | 中国矿业大学 | Method for determining coal ignitability |
| CN203705376U (en) * | 2014-02-25 | 2014-07-09 | 福州大学 | Device for identifying spontaneous combustion tendency of sulfide ores |
| CN204630963U (en) * | 2015-05-12 | 2015-09-09 | 中国计量学院 | Detect the experimental provision of spontaneous combustible substance energy of activation |
| CN105973936A (en) * | 2016-07-19 | 2016-09-28 | 中国科学技术大学 | Testing device for combustion performance of stacked materials under constant-power heating effect of spherical metal hot particles |
-
2020
- 2020-06-05 CN CN202010509644.9A patent/CN111965213A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206211A (en) * | 2007-12-18 | 2008-06-25 | 中国矿业大学 | Method for determining coal ignitability |
| CN203705376U (en) * | 2014-02-25 | 2014-07-09 | 福州大学 | Device for identifying spontaneous combustion tendency of sulfide ores |
| CN204630963U (en) * | 2015-05-12 | 2015-09-09 | 中国计量学院 | Detect the experimental provision of spontaneous combustible substance energy of activation |
| CN105973936A (en) * | 2016-07-19 | 2016-09-28 | 中国科学技术大学 | Testing device for combustion performance of stacked materials under constant-power heating effect of spherical metal hot particles |
Non-Patent Citations (1)
| Title |
|---|
| 赵丹: "面向典型致热材料的自热特性测试系统研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020052286A1 (en) | Method for collecting and testing lithium ion battery thermal runaway products | |
| CN208109740U (en) | A kind of lithium ion battery combustion explosion risk experimental rig | |
| AU2020100862A4 (en) | Method For Collecting And Testing Lithium Ion Battery Thermal Runaway Products | |
| CN203705376U (en) | Device for identifying spontaneous combustion tendency of sulfide ores | |
| CN109961602A (en) | A kind of SCM Based lithium ion battery fire disaster alarming device | |
| CN202710524U (en) | Single combustion testing machine | |
| CN202903705U (en) | Testing device for dynamic vacuum stability test | |
| CN101650287A (en) | Electrical heating type cylindrical raw coal spontaneous combustion testing device and method | |
| CN111965213A (en) | System capable of automatically measuring self-heating tendency of accumulation body | |
| CN203396760U (en) | Visible test device for oxidation spontaneous combustion of simulated fluidized coal sample | |
| CN114267150A (en) | Early fire detection and early warning method for thermal runaway of lithium battery | |
| CN207066623U (en) | A kind of solid material burning behavior measurement apparatus | |
| CN201852600U (en) | Portable multifunctional comprehensive safety detector | |
| CN104807962B (en) | A kind of compound portable Tunnel Blasting gas dirt real-time monitoring device | |
| CN207163492U (en) | A kind of USB interface-based portable air mass detecting instrument | |
| CN216012519U (en) | Temperature monitoring device of CNG holding vessel | |
| CN105910713B (en) | A kind of temperature signal collection system based on PLC | |
| CN206096064U (en) | Boiler smoke detection device | |
| CN202793980U (en) | Distributed wireless dust measuring instrument | |
| CN203870052U (en) | Quick detection device for high precision active coke ignition points | |
| CN205210605U (en) | Harmful gas data collection station and monitoring system who constitutes thereof | |
| CN111443168A (en) | Boiler flue gas nitrogen oxide monitoring alarm system | |
| CN207300408U (en) | Oxygen bottle filling process overheating warning device | |
| CN209372846U (en) | A kind of hydrocarbon gas monitoring system based on wireless sensor | |
| CN219913960U (en) | Self-heating solid classification test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201120 |