1m3 dust/gas explosion test device

1、 Function

1.1compose

1m³ The dust/gas explosion testing device meets the requirements of dust testing, gas testing, gas powder two-phase testing, inerting and explosion suppression material performance evaluation testing, and explosion pressure relief testing. The device consists of a microcomputer control system, an explosive container, a vacuum pumping system, an automatic ignition device, an automatic gas distribution system, a wireless data transmission system, and a computer monitoring system.

1.2 Function

The experimental device has the following functions: automatic vacuum pumping, sample chamber pressurization, automatic gas distribution, automatic powder spraying, ignition, data acquisition, wireless data transmission and storage, and data analysis. Test the pressure and temperature parameters of gas, dust, and gas/powder two-phase explosion processes, and conduct optical testing through an optical window. The specific functions are as follows:

(1) Measurement of multicomponent mixed gases, dust, and gas/dust mixtures;

(2) The explosion index of combustible gases in the air, including the maximum explosion pressure of the gas and the rate of increase of the maximum pressure of the gas:

(3) Lower explosive limit of combustible gases in the air;

(4) The maximum explosion pressure and maximum pressure rise rate of dust clouds;

(5) The maximum oxygen concentration of a gas;

(6) Evaluation of inerting performance of inerting materials:

(7) Evaluation of explosion suppression performance of explosion suppression materials and verification of explosion suppression methods.

2、 Structure

2.1 Explosive containers

Volume 1m³The static working pressure is 1.2MPa.

2.2 Dust diffusion system

The sample chamber has a capacity of 5L and a maximum working pressure of 2.5MPa; The working pressure of the high-speed gas/dust injection valve is 1-2.5MPa.

2.3 Valve system

Adopting the pressure division method for automatic gas distribution technology to achieve multi-channel gas automatic distribution, equipped with independent precision gas distribution pressure sensors and valves, with a gas distribution accuracy of ± 0.1%

Invention Specialist Li ("Measurement Device and Operating Method for Limiting Oxygen Concentration Parameters of Combustible Gases")

Special Li Number: ZL 2017 1 0443836.2

Exclusive rights holder: Jilin Hongyuan Scientific Instrument Co., Ltd./Emergency Management Bu Tianjin Fire Research Institute (formerly known as Public Security Bu Tianjin Fire Research Institute)

Precision air distribution consists of 4 channels (including 3 sample channels and 1 air channel), with an accuracy of 0.1%; Measurement range of valve pressure: 0-1000kPa (absolute pressure), resolution: 0.1kPa, accuracy: ± 0.1% FS.

2.4 Vacuum System

System sealing: Under 50kPa (absolute pressure), the pressure rise within 5 minutes is ≤ 0.5kPa.

2.5 Mixing system (optional)

Magnetic drive, resistant to explosive impact.

3、 Control and Data Acquisition and Processing System

The experimental device is remotely monitored wirelessly by a computer, with data transmitted and stored wirelessly. The human-machine interface is separated to ensure the personal safety of the testing personnel.

3.1 Automatic Control

The experimental device automatically evacuates according to the set parameters, automatically mixes the dust sample into the explosion container, automatically stirs (optional), ignites, and automatically collects explosion parameters and stores them in a data file. Draw a time curve of bao explosion parameters, and the data can be saved to EXCEL for further analysis and processing.

3.2 Manual Control

It is possible to independently operate vacuum pumping, gas distribution, mixing (optional), ignition, data acquisition and storage, container cleaning, etc. through a simulated keyboard, and data files can be read into a computer for analysis and processing.

3.3 Multi channel data synchronization acquisition and processing system

The experimental device automatically evacuates according to the set parameters, automatically mixes the dust sample into the explosion container, automatically stirs (optional), ignites, and automatically collects explosion parameters and stores them in a data file. Draw a time curve of bao explosion parameters, and the data can be saved to EXCEL for further analysis and processing.

3.3.1 Explosion pressure detection range: 0-2MPa (absolute pressure); Resolution: 0.001MPa; Accuracy: ± 0.25% FS;

Response time: ≤ lms; Standard configuration includes 1 high-speed pressure sensor.

3.3.2 Flame temperature detection range: 0-1200 ℃; Resolution: 1 ℃; Accuracy: ± 0.5% FS;

Response time: ≤ lms; Optional high-speed flame temperature sensor.

3.3.3 Data sampling interval: 0.2ms; sampling depth: 3s; real-time display of pressure time and other data.

3.4 External Device Drivers

Configure two external device synchronization triggering function modules to synchronize or delay the output of TTL start signals, in order to synchronously start external high-speed cameras and other testing equipment.

4、 Experimental conditions

4.1Initial pressure, local atmospheric pressure

4.2Container vacuum pumping: 5-100kPa

4.3Sample chamber pressure; 1～2.5MPa

4.4Delay ignition time: 1-1000ms

4.5Sample compartment automatically closes after a delay

4.6The sum of injection volumes for gas sample 1 (2, 3); 0-100%.

5、 Ignition system

5.1 Chemical ignition

The ignition energy range is 10J to 10KJ (10KJ requires a proportional configuration of 40% zirconium powder, 30% nitric acid, and 30% barium peroxide, to be provided by the user).

5.2 Electric spark ignition

(1) High frequency pulse ignition device electric spark energy: 0-300J;

(2) Spark voltage: 15kV;

(3) Spark current: 20mA;

(4) Adjustable ignition energy, duration: 1-1000ms

6、 Optical system (optional)

Two ultra large optical windows made of 150mm quartz glass are symmetrically arranged in the horizontal direction of the tank, with a pressure resistance of 3MPa and a transmission wavelength range of 200-1000nm. The surfaces of the two windows are strictly parallel and can be used for high-speed photography, schlieren and other testing projects.

7、 Sampling interface

Configure sampling interface, which can be used for analysis equipment such as chromatography after sampling.

8、 Test type

8.1 Dust test: automatic powder spraying, delayed ignition, collection of explosion pressure data, drawing of explosion pressure/time curve, data analysis.

8.2 Gas Test: Automatically mix the gas sample into 1m according to the set value³Explosion container, magnetic driven stirring, static mixing, ignition and explosion pressure data collection, drawing explosion pressure/time curve, data analysis.

8.3 Gas powder two-phase test: automatic gas distribution, dust spraying, delayed ignition, explosion pressure data collection, and curve drawing.

8.4 Inert Material Inert Performance Evaluation Test: The material's chemical performance is evaluated by changes in ignition energy.

8.5 Explosion suppression material explosion suppression performance evaluation test: The explosion suppression performance of the material is evaluated by changing the explosion parameters.

8.6 Pressure relief test: Study the effect of pressure relief hole area on pressure relief efficiency by changing the size of the pressure relief hole.

9、 Environmental monitoring

Used for monitoring the safe operating conditions of environmental temperature, humidity, and air pressure of electronic components inside the device, and is not used as a judgment of experimental conditions.

9.1 Atmospheric pressure measurement range: 10-110.0kPa Resolution: 0.1kPa;

9.2 Environmental temperature measurement range: -40~80 ℃ Resolution: 0.1 ℃;

9.3 Environmental humidity measurement range: 0-100% RH resolution: 0.1% RH.

10、 Workstation

CPU-i5, 8GB RAM, 512GB hard drive

11、 Power supply requirements

220V ± 10% AC 50Hz ± 2Hz; Power: ＜ 5KW.

12、 Working environment

Environmental temperature: 10 ℃~40 ℃;

Environmental humidity: 5% to 90% RH.