Dust explosion suppression system

Abstract

The utility model relates to the technical field of dust explosion prevention, and particularly discloses a dust explosion suppression system which comprises a monitoring unit, an explosion suppression unit and a purification unit, the monitoring unit comprises a monitoring column, and a laser emitter and a laser intensity detector which are opposite to each other are arranged in the monitoring column; the explosion suppression unit comprises an explosion suppression box body and a nitrogen steel cylinder, the explosion suppression box body is arranged on the ground, the nitrogen steel cylinder is arranged in the explosion suppression box body, and an air jet hole is formed in the nitrogen steel cylinder; the purification unit comprises an exhaust fan and suction openings, the suction openings communicate with the exhaust fan, and the suction openings are formed in the lower portions of the two sides of the explosion suppression unit. The objective of the utility model is to solve the technical problem of how to monitor explosion risks and carry out warning and corresponding processing.

Description

Technical Field

[0001] The utility model relates to the technical field of dust explosion protection, and specifically discloses a dust explosion suppression system. Background Art

[0002] Dust explosion refers to a chemical reaction in which a combustible dust forms a dust cloud by mixing with air in a confined space, and the dust cloud burns rapidly under the action of an ignition source, causing a rapid increase in temperature and pressure.

[0003] In recent years, a large number of explosion protection products have been well promoted and applied in confined spaces. However, dust explosion accidents still occur. Dust explosion poses great harm to personnel, seriously threatening personal safety. At the same time, it also causes great damage to confined spaces and equipment, resulting in serious economic losses.

[0004] The patent with application number 202020692675.8 discloses a dust explosion suppression system applied to a protected device, including: a controller, one end of the controller is connected to a suppressor, and the other end of the controller is connected to an explosion pressure monitor; the suppressor is connected to the communication pipeline of the protected device; the explosion pressure monitor is installed on the protected device, and its installation position is not fixed and can be adjusted according to the type of the protected device. The utility model mainly uses the explosion pressure monitor to monitor the pressure and pressure rise rate in the system. When it is detected that the pressure and pressure rise rate in the protected device exceed the set value, an alarm signal is transmitted to the controller, and at the same time, the suppressor is controlled to work. The suppressor can detect the pressure change in the initial stage of the explosion within a few milliseconds and release the inhibitor before reaching the destructive pressure to stop the explosion process.

[0005] The above patent mainly controls the transfer of explosion heat within a few milliseconds after the explosion occurs, forms a protection barrier, and plays an explosion suppression role. However, the energy generated after the explosion is huge and the chain reaction is extremely fast. If there is a problem with the equipment, it is very difficult to control the explosion. If a warning can be issued before the explosion and corresponding measures can be taken, the explosion can be avoided, but the prior art lacks the technology of pre-explosion alarm and explosion suppression. Summary of the Utility Model

[0006] In view of this, the purpose of the present utility model is to provide a dust explosion suppression system to solve the technical problem of how to monitor the explosion risk, give a warning and carry out corresponding treatment.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A dust explosion suppression system includes a monitoring unit, an explosion suppression unit, and a purification unit; the monitoring unit includes a monitoring column, and a laser emitter and a laser intensity detector are arranged oppositely inside the monitoring column; the explosion suppression unit includes an explosion suppression box body and a nitrogen cylinder, the explosion suppression box body is arranged on the ground, the nitrogen cylinder is arranged inside the explosion suppression box body, and an air jet port is arranged on the nitrogen cylinder; the purification unit includes an exhaust fan and an air suction port, the air suction port is communicated with the exhaust fan, and the air suction port is arranged below both sides of the explosion suppression unit. In this solution, the dust concentration in the confined space is detected by the monitoring column. The specific principle is as follows: after the laser emitter emits laser, the dust in the air will block the laser propagation and affect the laser intensity. Then, after the laser intensity detector detects the laser intensity, the dust concentration in the confined space can be judged. When the dust concentration reaches the threshold, the explosion suppression unit and the purification unit are started. The explosion suppression unit can effectively inhibit the conditions required for explosion, and the purification unit can quickly extract the dust in the air.

[0009] Optionally, the monitoring column includes an upper seat body, a lower seat body, and a support frame. The upper seat body is arranged at the top of the inner wall of the confined space, the lower seat body is arranged on the ground of the confined space, the support frame is arranged between the upper seat body and the lower seat body, and the support frame is arranged along the circumferential direction of the upper seat body / lower seat body. The laser emitter is arranged at the upper end of the lower seat body and vertically upward, and the laser intensity detector is arranged at the bottom of the upper seat body and vertically downward.

[0010] Optionally, the explosion suppression box body is provided with two flip-up upper covers, and shielding covers are arranged on both sides of the two upper covers facing each other. The shielding covers can be flipped towards the inside of the explosion suppression box body; a cross frame is detachably arranged on the inner wall of the explosion suppression box body, and an electromagnet is arranged on the cross frame. After the electromagnet is energized, it can attract the shielding cover to flip towards the electromagnet. In this solution, when the monitoring column detects that the dust concentration exceeds the standard, the electromagnet is instantly started and attracts the shielding cover to it. The shielding cover is opened, and the air jet port in the explosion suppression box body is exposed, and the nitrogen cylinder inside can spray nitrogen. After the nitrogen enters the confined space, the air content can be reduced, and then the oxygen content can be reduced to inhibit dust explosion. At the same time, the nitrogen cylinder generally contains liquid nitrogen, and a large amount of heat will be absorbed when the liquid nitrogen changes from liquid to solid, which can reduce the surrounding temperature.

[0011] Optionally, the exhaust fan is arranged on both sides of the explosion suppression box body, the air suction port is horizontally arranged and faces away from the explosion suppression box body, and the horizontal distance between the air suction port and the air jet port is between 1 and 3 m. In this solution, there is a certain distance between the air suction port and the explosion suppression box body to prevent the air suction port from pumping out a large amount of nitrogen, resulting in a decrease in nitrogen content.

[0012] Optionally, a spraying device is provided at the top of the confined space. The spraying device includes an electronically controlled sprinkler head that can spray water mist. The spraying device can spray water mist to quickly reduce the amount of dust in the air.

[0013] Optionally, the electronically controlled sprinkler head is arranged above the air extraction opening.

[0014] The working principle and beneficial effects of this solution are as follows:

[0015] In this solution, the dust concentration in the air is judged by detecting the laser intensity. When the dust concentration reaches the threshold (this threshold is generally set as: 80%-90% of the dust concentration in the explosion limit of dust explosion in this confined space), the monitoring column can issue an alarm, and then the purification unit and the explosion suppression unit can be started. The main structure in the explosion suppression unit is a nitrogen gas cylinder. After the gas jet opening of the nitrogen gas cylinder is opened, a large amount of nitrogen gas is ejected. During the process, the liquid nitrogen in the cylinder changes into nitrogen gas and will also absorb a large amount of heat, cooling the confined space and reducing the temperature threshold required for the explosion limit, playing a role in explosion suppression to a certain extent. At the same time, after a large amount of nitrogen gas is ejected, the oxygen content in the air can be reduced, so that the oxygen concentration cannot reach the oxygen concentration requirement for dust explosion, playing a role in explosion suppression. When the explosion suppression unit is started, the personnel in the confined space quickly evacuate, and the ejected nitrogen gas will not cause harm to the personnel. The purification unit in this solution can extract the dust in the air, reduce the dust concentration, and at the same time, the position of the air extraction opening in the purification unit can extract as little nitrogen gas as possible. The electronically controlled sprinkler head can also play a role in reducing dust.

[0016] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the embodiment;

[0018] Figure 2 It is a schematic structural diagram of the monitoring unit, explosion suppression unit, purification unit, and spraying device;

[0019] Figure 3 It is a schematic structural diagram of the monitoring column;

[0020] Figure 4 It is a schematic structural diagram of the explosion suppression unit and the purification unit.

[0021] The markings in the attached drawings are as follows: confined space 1, monitoring column 2, explosion suppression unit 3, lower seat body 4, support frame 5, upper seat body 6, explosion suppression box body 7, upper cover 8, shielding cover 9, exhaust fan 10, air extraction port 11, spraying device 12, laser emitter 13, laser intensity detector 14, nitrogen gas cylinder 15, air jet port 16, electromagnet 17. Detailed implementation manners

[0022] The following is a further detailed description through specific implementation manners:

[0023] Embodiment

[0024] A dust explosion suppression system includes a monitoring unit, an explosion suppression unit 3, a purification unit, and a spraying device 12.

[0025] The monitoring unit includes a monitoring column 2, and a laser emitter 13 and a laser intensity detector 14 are arranged oppositely inside the monitoring column 2. The specific structure of the monitoring column 2 is as follows: it includes an upper seat body 6, a lower seat body 4, and a support frame 5. The upper seat body 6 is arranged at the top of the inner wall of the confined space 1, and the lower seat body 4 is arranged on the ground of the confined space 1 (the confined space 1 in this embodiment may refer to a confined space); the support frame 5 is arranged between the upper seat body 6 and the lower seat body 4, and the support frame 5 is arranged circumferentially along the upper seat body 6 / lower seat body 4, and there is a space between several support frames 5. The laser emitter 13 is arranged at the upper end of the lower seat body 4 and vertically upward, and the laser intensity detector 14 is arranged at the bottom of the upper seat body 6 and vertically downward.

[0026] The explosion suppression unit 3 includes an explosion suppression box body 7 and a nitrogen gas cylinder 15. The explosion suppression box body 7 is arranged on the ground, the nitrogen gas cylinder 15 is arranged inside the explosion suppression box body 7, and several air jet ports 16 are arranged on the nitrogen gas cylinder 15. The explosion suppression box body 7 is provided with two rotatable upper covers 8, and rotatable shielding covers 9 are arranged on opposite sides of the two upper covers 8, and the shielding covers 9 can be turned towards the inside of the explosion suppression box body 7. The upper covers 8 and the shielding covers 9 can both adopt the hinge method to achieve the turning function. A cross frame is detachably arranged on the inner wall of the explosion suppression box body 7, and an electromagnet 17 is arranged on the cross frame. After the electromagnet 17 is powered on, it can attract the shielding cover 9 to turn towards the direction of the electromagnet 17.

[0027] The purification unit includes an exhaust fan 10 and an air extraction port 11. The air extraction port 11 is communicated with the exhaust fan 10. The air extraction port 11 is arranged below both sides of the explosion suppression unit 3, specifically below the outside of the explosion suppression box body 7. The exhaust fan 10 is arranged on both sides of the explosion suppression box body 7. The air extraction port 11 is horizontally arranged and faces away from the explosion suppression box body 7. The horizontal distance between the air extraction port 11 and the air jet port 16 is between 1 - 3 m.

[0028] A spraying device 12 is arranged at the top of the confined space 1. The spraying device 12 includes an electrically controlled spray head, and the electrically controlled spray head can spray water mist. The electrically controlled spray head is arranged directly above the air extraction port 11.

[0029] In this embodiment, a central control unit, a signal receiving device and a signal transmitting device can also be provided. The signal transmitting device can be arranged on the laser intensity detector 14, and the signal receiving device is arranged on the explosion suppression unit 3, the purification unit and the spraying device 12. When it detects that the laser intensity reaches the critical value, it sends a signal to the central control unit, and the central control unit then sends a signal to the explosion suppression unit 3, the purification unit and the spraying device 12 to control their startup.

[0030] During specific implementation:

[0031] The laser emitter 13 can emit laser. After the laser passes through the dust in the confined space 1, its intensity and brightness will both decrease. When the laser intensity detector 14 detects that the laser intensity is lower than 80% of the threshold value and is detected 60 times within 1 minute, and 45 of them are unqualified, it indicates that the dust concentration in the confined space 1 is too high, and the explosion suppression unit 3, the purification unit and the spraying device 12 need to be started. When the explosion suppression unit 3 is started, first, the electromagnet 17 is energized, and then the electromagnet 17 attracts the shielding cover 9 to flip downwards, and the air jet port 16 of the nitrogen gas cylinder 15 is exposed. At this time, the nitrogen gas in the nitrogen gas cylinder 15 quickly sprays out; at the same time, the purification unit is started, and the exhaust fan 10 of the purification unit extracts the dust in the air. The spraying device 12 sprays water mist at the same time to reduce the dust in the air.

[0032] The above are only the embodiments of the present invention. Common knowledge such as the specific structures and characteristics in the solutions is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the present invention.

Claims

1. A dust explosion suppression system, characterized in that: It includes a monitoring unit, an explosion suppression unit and a purification unit; the monitoring unit includes a monitoring column, in which relative laser emitters and laser intensity detectors are arranged; the explosion suppression unit includes an explosion suppression box body and a nitrogen cylinder, the explosion suppression box body is arranged on the ground, the nitrogen cylinder is arranged in the explosion suppression box body, and the nitrogen cylinder is arranged with an air jet; the purification unit includes an exhaust fan and an exhaust port, the exhaust port is connected to the exhaust fan, and the exhaust port is arranged below both sides of the explosion suppression unit.

2. The dust explosion suppression system according to claim 1, characterized in that: The monitoring column includes an upper seat, a lower seat and a support frame. The upper seat is arranged on the top of the inner wall of the confined space, the lower seat is arranged on the ground of the confined space, the support frame is arranged between the upper seat and the lower seat, and the support frame is arranged along the circumference of the upper seat / lower seat, the laser emitter is arranged at the upper end of the lower seat and vertically upward, and the laser intensity detector is arranged at the bottom of the upper seat and vertically downward.

3. The dust explosion suppression system according to claim 2, characterized in that: The explosion suppression box body is provided with two flip-over upper covers, and shielding covers are provided on opposite sides of the two upper covers, and the shielding covers can be flipped toward the inside of the explosion suppression box body; a cross frame is detachably provided on the inner wall of the explosion suppression box body, and an electromagnet is provided on the cross frame, and the electromagnet can attract the shielding cover to flip in the direction of the electromagnet after being energized.

4. The dust explosion suppression system according to claim 3, characterized in that: The exhaust fan is arranged on both sides of the explosion suppression box body, the exhaust port is arranged horizontally and faces a direction away from the explosion suppression box body, and the horizontal distance between the exhaust port and the air injection port is between 1-3m.

5. The dust explosion suppression system according to claim 4, characterized in that: A spray device is arranged on the top of the confined space, and the spray device comprises an electrically controlled spray head, and the electrically controlled spray head can spray water mist.

6. The dust explosion suppression system according to claim 5, characterized in that: The electrically controlled spray head is arranged above the air exhaust port.

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