CN202693574U - Simulation device for cellular materials to restrain gas explosion communication effect experiments - Google Patents

Abstract

The utility model relates to a simulation device for the experiment of the effect of suppressing the propagation of gas explosion by porous materials, relating to a pipeline experiment simulation device. It is to meet the needs of experiments on the effect of porous materials on suppressing the propagation of gas explosions. Its N-section main pipelines are connected to an explosion wave propagation pipeline through N-1 flanges, and one end of the explosion wave propagation pipeline is communicated with the opening end of the detonation pipeline through a flange to form an experimental pipeline; The above-mentioned barrier layer seals the opening end of the detonation pipeline or one of the opening ends on one of the flanges; a temperature sensor installation hole and a pressure sensor installation hole are opened on the detonation pipeline and the N-section main pipeline; Air hole, vacuum pump connection hole and detonator connection hole. The utility model is suitable for experiments on the effect of porous materials suppressing the propagation of gas explosions.

Description

A simulation device for experiments on the effect of porous materials on suppressing the propagation of gas explosions

technical field

The utility model relates to a pipeline experiment simulation device.

Background technique

Based on the analysis of the gas explosion theory and propagation process combined with the coal mine gas explosion accident case, it can be known that the main influencing factors in the coal mine gas explosion process are the maximum pressure of the gas explosion shock, the flame temperature and its propagation process during the gas explosion process, In the process of gas explosion propagation, shock wave pressure is the main cause of death of coal mine workers and destruction of equipment and roadways. Explosion flames can severely burn workers, which can make gas explode continuously and may cause secondary explosion of coal dust. It is a continuous explosion. The main cause of the explosion. Therefore, it is necessary to determine the porous material to study the change of pressure, the change of flame temperature and the continuous propagation of flame in the process of gas explosion. At present, due to the lack of large-aperture and high-quality experimental pipes, the accuracy of the experimental results obtained by porous materials in inhibiting the propagation of gas explosions is relatively low.

Utility model content

The utility model is to meet the requirements of the porous material suppressing gas explosion spreading effect experiment, thereby providing a simulation device for the porous material suppressing gas explosion spreading effect experiment.

A simulation device for the experiment of the effect of porous materials on inhibiting the propagation of gas explosions, which includes a detonation pipe with one end open, a main pipe with N sections open at both ends, N flanges and a barrier layer; the N section main pipes pass through N -1 flange is connected as an explosion wave propagation pipeline, and one end of the explosion wave propagation pipeline communicates with the opening end of the detonation pipeline through a flange to form an experimental pipeline; the barrier layer connects the opening end of the detonation pipeline or One open end on a flange is sealed; a temperature sensor installation hole and a pressure sensor installation hole are opened on the detonation pipeline and the N-section main pipeline; gas injection holes, vacuum pump connection holes and detonator connection holes are opened on the detonation pipeline; N is a positive integer.

It also includes a rubber pad, and rubber pads are used to seal between the N-section main pipelines, and between the explosion wave propagation pipeline and the detonation pipeline.

It also includes four circulation pump mounting holes on the side wall of the experimental pipeline.

It also includes a vacuum gauge, which is placed on the detonation pipe.

The utility model provides a simulation device for the experiment of the effect of the porous material suppressing the propagation of the gas explosion, which can simulate the effect of the porous material suppressing the propagation of the gas explosion in different positions as required, and meets the requirements of the experiment of the effect of the porous material suppressing the propagation of the gas explosion.

Description of drawings

Fig. 1 is a schematic structural view of the utility model; Fig. 2 is a distribution schematic diagram of an air injection hole, a vacuum pump connection hole and a detonator connection hole on the detonation pipeline; Fig. 3 is a schematic structural diagram of an experimental device built in the specific embodiment one.

Detailed ways

The specific embodiment one, in conjunction with Fig. 1 illustrates this specific embodiment, is used for the simulation device of porous material suppression gas explosion propagation effect experiment, and it comprises the detonation pipeline 1 of opening at one end, the main pipeline 2 of opening at both ends of N section, N method The blue plate 3 and the barrier layer; the N-section main pipeline 2 is connected to an explosion wave propagation pipeline through N-1 flanges 3, and one end of the explosion wave propagation pipeline is connected to the detonation pipeline through a flange The opening end of 1 is connected to form an experimental pipeline; the barrier layer seals the opening end of the detonating pipeline 1 or an opening end on a flange 3; a temperature sensor is installed on the detonating pipeline 1 and the N-section main pipeline 2 Hole 4 and a pressure sensor installation hole 5; detonation pipeline 1 is provided with gas injection hole 6, vacuum pump connection hole 7 and detonator connection hole 8; N is a positive integer.

The experimental pipeline in this embodiment is a square experimental pipeline with a large section of 30cm×30cm.

The utility model features: strong impact resistance and high temperature resistance; high air tightness; good mobility and combination; sufficient number of installation holes can be opened for the experimental pipeline.

The gas distribution system and ignition system used in the experiment of this embodiment:

A. Air distribution system

Design Principles:

(1) The gas distribution process is safe and fast;

(2) Gas-air mixtures with different volume fractions can be configured according to requirements;

(3) The gas distribution equipment is easy to operate and the equipment is easy to purchase.

Solution: The gas distribution system consists of a 100% concentration methane gas cylinder, a gas flow valve, a methane concentration sensor, an explosion-proof circulation pump and a single check valve. Its main working principle is: according to the concentration requirement, calculate the required methane volume fraction in the pipeline, use the gas flow valve to inject a certain amount of methane gas into the experimental pipeline, and then turn on the circulation pump to circulate the gas in the pipeline. When the readings of the gas concentration sensor behind the single check valve reach a certain value, the circulation pump and the check valve are turned off, and the experiment is carried out. Before starting the experiment, the volume of the space where methane gas may remain in the gas injection hose, flow valve, and circulation pump has been calculated, and corrections are made when gas is injected into the pipeline to achieve accurate purposes.

B. Ignition system

Design Principles:

(1) The ignition energy is greater than 0.28mJ;

(2) The ignition frequency is greater than 10 times/s;

(3) High stability, ensuring that the ignition energy changes within ±5%, and can continue to supply power to ensure continuous experimentation;

(4) The safety factor is high, which can ensure the safety of operators.

Proposal: Considering the cost of equipment, ease of use and sustainability of the experiment, the ignition device was finally selected as an electronic igniter produced by Huada Electronics Factory in Nantong City, Jiangsu Province. The ignition energy is 60J, and the ignition frequency is 10-15 times/s , using two No. 5 AA1.5V for supply.

The test system adopted in the experiment of this embodiment:

Data collection and data processing:

The experimental system mainly conducts experimental research on gas explosion pressure, flame temperature and flame propagation effect. These three signals can be converted into voltage signals, so a set of data acquisition system is used for the acquisition of these three data signals.

1. Data acquisition system

Design Principles:

(1) Able to accurately and quickly respond to experimental data;

(2) There is a data acquisition system or acquisition card to collect the excitation data of a certain channel;

(3) It can work continuously and stably, with low hardware requirements and high cost performance;

(4) Supporting data processing tools have extensive resources and are easy to operate.

Proposal: Four sets of dynamic data acquisition systems are used, which are purchased and configured by myself according to the experimental needs. It consists of four computers, four four-channel data acquisition cards and eight conditioning modules. The computer is Founder Shangqi N720, the main parameters are as follows: the processor is Core E6700 with a main frequency of 2.6Hz, 2GDDR3 memory, and the hard disk is 500G. The data acquisition card adopts the model PCI-9812 produced by Taiwan ADLINK, as shown in Figure 3.3. The main parameters are as follows: 32-bit PCI bus, plug and play, the highest sampling frequency of each channel is 20MHz, 8 single-ended synchronous input channels, 12 1-bit analog input resolution, 8 A/D converters, one converter for each analog channel, 32k word FIFO on board, bipolar analog input range, five A/D trigger modes : Software trigger, pre-trigger, post-trigger, mid-trigger and delay trigger, the sampling frequency can be programmed.

This experiment uses the trigger function of the first measurement point of the data acquisition card. The data acquisition card has sixteen channels in total, one of which is the acquisition channel and the trigger channel, and the acquisition card is triggered to start data acquisition through one channel.

2. Data processing software

Design Principles:

(1) The software is fully compatible with the ADLINK PCI9812 data acquisition card used in this experiment;

(2) The software can run stably for a long time, and has relatively low requirements for computer hardware;

(3) The acquisition card has a strong ability to identify data, has a long sampling length and sampling time, and can eliminate certain external interference to the experiment through the software itself;

(4) The software is easy for data processing, easy for data processing personnel to operate, and has certain scalability and developability.

DIADem和MathWorks的离线分析。利用凌华科技AD-Loggert软件可轻松在每套采集系统上建立起16通道数据采集方案，完成对压力和火焰温度采集的基础编程工作。Solution: Considering software cost, software compatibility and developability, the data processing software used in this experiment is ADLINK AD-Logger, a data acquisition software matched with ADLINK PCI9812. ADLINK AD-Logger is a ready-to-use software logger that provides rich and flexible solutions for data acquisition applications. Sampling conditions can be easily configured through the ADLINK DAQPilot interactive wizard without any programming. As long as the system is compatible with ADLINK DAQ equipment and AD-Logger is installed, the data acquisition and display functions can be started immediately. The main features are as follows: data recording based on DAQPilot task configuration; support real-time and historical data viewing; support instant usable and intuitive user interface; support data export function, and use it for third-party applications, including Microsoft Excel,

DIADem and MathWorks offline analysis. ADLINK AD-Loggert software can be used to easily establish a 16-channel data acquisition solution on each acquisition system to complete the basic programming of pressure and flame temperature acquisition.

The pressure acquisition system adopted in the experiment of this embodiment:

Design Principles:

(1) Short response time and strong sensitivity to pressure;

(2) The range of the pressure sensor is 10% greater than the maximum pressure value of the gas explosion;

(3) The connection is convenient, and the supporting signal conditioning and signal amplification equipment are easy to purchase;

(4) The sensor is durable, corrosion-resistant, impact-resistant, and less affected by the external environment.

Solution: Considering the purchase of the pressure sensor range and its supporting equipment, the pressure test system finally used in this experimental system consists of a pressure sensor and a sensor conditioning module. The sensor used is produced by Dytarn Company in the United States, the model is 2300V1, the range is 250psi (Note: 1psi=1 lb/inch=6894.76 Pa, 250psi is 1.723625MPa), the division is 20mV/psi, 10-32 top connectors, with Acceleration compensation function, sensor response time is millisecond level. The single-channel conditioning module is produced for Dytran pressure sensors in the United States. The model is Electronics SignalConditioners-4110C. The main technical parameters are: external power supply, 2-20mA conditioning, effectively filtering the influence of the outside world on the current.

The flame temperature acquisition system adopted in the experiment of this embodiment:

Design Principles:

(1) Sensitive to temperature changes, the response time is milliseconds;

(2) The range of the temperature sensor is greater than 2300°C;

(3) The sensor has strong impact resistance and can resist the burning of flames generated by gas explosions;

(4) It has a certain ability to eliminate the gas and other effects produced by the gas explosion, and the sensor can be used repeatedly.

Solution: The flame sensor is produced by NANMAC Company of the United States, the model is E12-1-C-U, the main technical parameters are as follows: range 0-2300 ℃, response time up to microseconds, the thermocouple junction is placed on the end surface of the probe, and can be processed into any shape , the erosion or wear during the measurement process will automatically renew its thermocouple junction,

Can measure inside wall surface (thermally grounded thermocouple) or two different temperature non-thermally grounded thermocouples in the room. The external protection material of the thermocouple is stainless steel, with special connecting joints, connecting wires and fixing nuts.

The flame propagation phenomenon observation system adopted in the experiment of this embodiment:

Design Principles:

(1) The response time is short, and the flame signal can be quickly captured;

(2) High anti-interference ability, effectively avoiding vibration and electromagnetic interference;

(3) The flame signal can also be collected under the condition of low flame illumination.

Design scheme: According to the above requirements, the experimental system intends to use a high-speed camera as an observation instrument for the flame propagation phenomenon. The high-speed camera can collect the propagation of the flame under the condition of low illumination, effectively avoiding other interference.

Experimental program:

1. Air traffic control experiment plan

A 30cm×30cm square experimental pipe designed and manufactured by ourselves was used to conduct gas explosion experiments. In order to verify the effect of the explosion-proof device, this paper selected 7.68% gas explosion concentration and designed an experimental plan:

The whole pipe is filled with gas mixture, the front end is ignited, and the rear end is closed. This scheme can simulate the gas explosion process under the condition that the local roadways in the mine are completely filled with gas explosion gas, and most of the roadway sections are blocked or there are obstacles such as dampers and airtightness.

The main purpose of the scheme design is to study the propagation law of the gas explosion process, and also to provide a comparative basis for the experimental research of the explosion isolation technology.

2. Explosion-proof experimental plan for gas barrier

The 30cm×30cm square experimental pipe designed and manufactured by ourselves is used to conduct experimental research on the influence of porous materials on the propagation of gas explosions.

Install the porous material at 3.5m away from the pipeline using a fixing frame. Select the gas explosion concentration condition of 7.68%, fill the whole pipe with gas mixture, insert porous material on the fixed frame of the pipe, ignite at the front end, and close the rear end. According to the parameters of the porous material, use the orthogonal experiment method to determine the number of explosion-proof experiment groups and order.

This scheme can simulate that the local confined space roadway in the mine is completely filled with gas explosion gas, and the explosion-proof device is surrounded by the gas mixture gas that reaches the explosion limit. One end ignites and explodes and propagates to the other side through the explosion-proof device to test the quenching of porous materials. The effect of fire and attenuation shock waves.

Sensor placement

A total of 8 groups of 16 sensors are equipped for experimental testing. Each section of pipeline is arranged with 2 groups of 4 sensor installation holes, and 1 group of 2 sensor installation holes is arranged on the detonation chamber. The specific parameters are shown in Table 1 below:

Table 1:

The experimental device designed and built by ourselves is shown in Figure 3. Among them, 1-1 is the computer, 1-2 is the data acquisition system; 1-3 is the explosion-proof circulation pump; 1-4 is the pressure sensor; 1-5 is the temperature sensor; 1-6 is the photosensitive sensor; 1-7 is the ignition system; 1-8 are one-way check valves; 1-9 are gas concentration sensors; 1-10 are gas injection holes.

Specific embodiment two, the difference between this specific embodiment and the simulation device used for the experiment of porous material suppressing gas explosion propagation effect described in specific embodiment one is that it also includes rubber pads, between the N section main pipes 2, Rubber pads are used to seal between the explosion wave propagation pipe and the detonation pipe 1 .

Specific embodiment three. The difference between this specific embodiment and the simulation device for the experiment of the effect of porous material suppressing gas explosion propagation described in specific embodiment one or two is that it also includes four loops on the side wall of the experimental pipeline. Pump mounting holes.

Embodiment 4. The difference between this embodiment and the simulation device for the experiment of porous material suppression gas explosion propagation effect described in Embodiment 3 is that it also includes a vacuum gauge 11, and the vacuum gauge 11 is arranged in the detonation pipeline. 1 on.

Embodiment 5. The difference between this embodiment and the simulation device for the experiment of the effect of porous material suppressing gas explosion propagation described in Embodiment 1, 2 or 4 is that the barrier layer is kraft paper.

Embodiment 6. The difference between this embodiment and the simulation device for the experiment of the effect of porous materials suppressing the propagation of gas explosion described in Embodiment 5 is that N=4.

Embodiment 7. The difference between this embodiment and the simulation device used for the experiment of porous material suppression gas explosion propagation effect described in Embodiment 1, 2, 4 or 6 is that the length of each main pipe 2 is 1.55 meters of pipes.

Embodiment 8. The difference between this embodiment and the simulation device for the experiment of the effect of porous materials suppressing the propagation of gas explosion described in Embodiment 7 is that the detonation pipeline 1 is a pipeline with a length of 0.3 meters.

In this embodiment, the experimental pipeline consists of four main pipelines and one detonation gas chamber, the lengths of which are 1.55m and 0.3m respectively, and the total length is 6.5m. Every two sections are flanged by 16 bolts, with a 1cm rubber pad in between to improve the airtightness of the pipeline. The upper part of each pipeline is provided with two pressure sensors and two temperature sensor installation ports, and the lower part of No. 4 pipeline has a valve as a detection valve. The detonation gas chamber is equipped with a temperature sensor and a pressure sensor installation port, and is also equipped with a vacuum gauge, a gas injection port, a vacuum pump connection port, and a detonator connection port.

Claims (8)

1. The simulation device used for the experiment of the effect of porous material suppressing the propagation of gas explosion, which is characterized in that it includes a detonation pipe (1) with one end open, a main pipe (2) with N sections open at both ends, and N flanges (3 ) and barrier layer; the N-section main pipeline (2) is connected to an explosion wave propagation pipe through N-1 flanges (3), and one end of the explosion wave propagation pipe is connected to the The opening end of the detonating pipeline (1) is connected to form an experimental pipeline; the barrier layer seals the opening end of the detonating pipeline (1) or an opening end on a flange (3); the detonating pipeline (1) and the N-section main The pipeline (2) has a temperature sensor installation hole (4) and a pressure sensor installation hole (5); the detonation pipeline (1) has a gas injection hole (6), a vacuum pump connection hole (7) and a detonator connection hole (8); N is a positive integer. 2. The simulation device for the experiment of porous material suppression gas explosion propagation effect according to claim 1, characterized in that it also includes rubber pads, between the N-section main pipes (2), between the explosion wave propagation pipe and the detonation initiation Rubber pads are used to seal between the pipes (1). 3. The simulation device for the experiment of porous material suppressing the propagation of gas explosion according to claim 1 or 2, characterized in that four circulation pump installation holes are provided on the side wall of the test pipeline. 4. The simulation device for experiments on the effect of porous materials suppressing gas explosion propagation according to claim 3, characterized in that it also includes a vacuum gauge (11), and the vacuum gauge (11) is set on the detonation pipeline (1) . 5. The simulation device for porous material suppression gas explosion propagation effect experiment according to claim 1, 2 or 4, characterized in that the barrier layer is kraft paper. 6. The simulation device for the experiment of porous material suppressing the propagation of gas explosion according to claim 5, characterized in that N=4. 7. The simulation device for the experiment of the effect of porous materials suppressing the propagation of gas explosion according to claim 1, 2, 4 or 6, characterized in that each section of the main pipeline (2) is a pipeline with a length of 1.55 meters. 8. The simulation device for experiments on the effect of porous materials suppressing gas explosion propagation according to claim 7, characterized in that the detonation pipeline (1) is a pipeline with a length of 0.3 meters.

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