CN111275257B - Dust explosion-proof air volume monitoring method and monitoring system - Google Patents
Dust explosion-proof air volume monitoring method and monitoring system Download PDFInfo
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Abstract
The invention provides a dust explosion-proof air volume monitoring method and a monitoring system, which comprises the following steps: s1, acquiring air inlet air quantity, middle air quantity and air outlet air quantity data in a certain period, and respectively calculating the air quantity average value and the air quantity variance of the air inlet air quantity, the middle air quantity and the air quantity of the air outlet in the period; s2, acquiring real-time air volumes of different parts of the negative pressure pipeline; s3, if the real-time air volume of any part is not lower than the corresponding alarm threshold value, calculating an early warning value Lv according to the real-time air volume, the corresponding air volume average value and the corresponding air volume variance; and S4, generating different early warning signals according to different early warning values. According to the invention, real-time air volume data of different parts of the negative pressure pipeline for reducing the dust concentration are obtained and are associated with the average air volume and the air volume variance to establish a grading early warning mechanism, so that the conditions of false alarm and missing alarm are avoided, and the accuracy of dust explosion-proof early warning is improved.
Description
Technical Field
The invention relates to the technical field of safety production, in particular to a dust explosion-proof air volume monitoring method and a dust explosion-proof air volume monitoring system.
Background
In the industries of mines, metallurgy, building materials, machining, chemical engineering, textiles and the like, a large amount of flammable and combustible dust is often generated due to the production processes of polishing, crushing, grinding and the like, and the generated harm is more serious than that of flammable gas and liquid due to the large diffusion space and the long deflagration process.
Therefore, in the prior art, the dust is mostly extracted by arranging a negative pressure pipeline so as to reduce the dust concentration and prevent explosion. Furthermore, in order to know the air flow rate in the negative pressure pipeline in real time and correlate the air flow rate with the dust concentration, a simple flow meter and the like are generally arranged at an air inlet/air outlet and the like of the pipeline for monitoring, and once the flow meter and the like break down, false alarm and false alarm are easily generated. In addition, due to the design path, shape, material and the like of the negative pressure pipeline, the air volume of a certain local part of the negative pressure pipeline may not reflect the real level of the air volume in the whole pipeline, so that the air volume monitoring result in the pipeline is inaccurate, and further cannot be accurately related to the dust concentration, and the dust explosion-proof effect cannot be achieved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a dust explosion-proof air volume monitoring method and a monitoring system, which establish a grading early warning mechanism by acquiring real-time air volume data of different parts in the same negative pressure pipeline and correlating the real-time air volume data with an air volume average value and a variance, so that the grading early warning mechanism is further accurately correlated with dust concentration to achieve the dust explosion-proof effect.
In order to achieve the purpose, the invention provides the following technical scheme:
the dust explosion-proof air volume monitoring method comprises the following steps:
s1, acquiring air inlet air quantity at an air inlet of a negative pressure ventilation pipeline, middle air quantity at the middle part of the pipeline and air outlet air quantity data at an air outlet in a certain period; the negative pressure ventilation pipeline is used for discharging dust in the first area to the second area through negative pressure so as to reduce the dust concentration in the first area and prevent dust explosion in the first area;
respectively calculating the air volume average value and the air volume variance of the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time on the assumption that the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time belong to normal distribution, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
s2, respectively and correspondingly arranging an air inlet air quantity sensor, a middle air quantity sensor and an air outlet air quantity sensor at the air inlet, the middle of the pipeline and the air outlet of the negative pressure ventilating pipeline so as to correspondingly monitor the air inlet, the middle of the pipeline and the air outlet of the negative pressure ventilating pipeline in real time and correspondingly obtain the real-time air quantity T of the air inlet, the real-time air quantity M of the middle and the real-time air quantity R of the air outlet of the negative pressure ventilating pipeline;
s3, if any one of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet is not lower than the corresponding alarm threshold value, calculating an early warning value Lv according to the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part, the real-time air quantity R of the air outlet, the corresponding average value of the air quantity and the corresponding variance of the air quantity, wherein the calculation formula (1) of the early warning value Lv is as follows:
and S4, generating different early warning signals according to different early warning values so as to remind personnel to take corresponding measures.
Preferably, if one or more of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is lower than the corresponding alarm threshold value, an alarm signal is directly generated.
Preferably, when the real-time air quantity T of the air inlet is less than or equal to 30M 3 /min and/or middle real-time air quantity M is less than or equal to 25M 3 Min and/or the real-time air quantity of an air outlet is less than or equal to 20M 3 And directly generating an alarm signal at min.
Preferably, the step S4 includes: and if the second limit value is less than or equal to the first limit value and less than or equal to the Lv, generating and sending first early warning information to remind personnel to take first measures.
Preferably, the step S4 includes: if the third limit value is less than or equal to the second limit value and less than or equal to the second limit value, calculating the contribution degree of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet to the early warning value Lv according to formulas (2) to (4); when the contribution degree of any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is less than or equal to a second limit value, second early warning information is generated and sent to remind personnel to take a second measure;
preferably, the step S4 includes: and if Lv is less than the third limit value, generating and sending third early warning information to remind personnel to take third measures.
The dust explosion-proof air volume monitoring system for realizing the monitoring method is characterized by comprising the following steps:
the historical data statistical unit is used for acquiring air inlet air quantity at an air inlet of the negative pressure ventilating duct, middle air quantity at the middle part of the duct and air outlet air quantity data at an air outlet in a certain period; respectively calculating the air volume average value and the air volume variance of the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
the air quantity sensors comprise an air inlet air quantity sensor arranged at an air inlet of the negative pressure ventilating duct, a middle air quantity sensor arranged at the middle part of a pipeline of the negative pressure ventilating duct and an air outlet air quantity sensor arranged at an air outlet of the negative pressure ventilating duct, so as to correspondingly monitor the real-time air quantity of the air inlet, the middle part of the pipeline and the air outlet of the negative pressure ventilating duct and correspondingly obtain the real-time air quantity of the air inlet, the real-time air quantity of the middle part and the real-time air quantity of the air outlet of the negative pressure ventilating duct;
the alarm unit is connected with the air inlet air quantity sensor, the middle air quantity sensor and the air outlet air quantity sensor and is used for directly generating an alarm signal when one or more of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is lower than a corresponding alarm threshold value;
and the early warning value calculation unit is connected with the air inlet air quantity sensor, the middle air quantity sensor, the air outlet air quantity sensor and the historical data statistics unit, and is used for calculating an early warning value Lv according to the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R and the corresponding air quantity average value and air quantity variance when any one of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is not lower than the corresponding alarm threshold, wherein a calculation formula (1) of the early warning value Lv is as follows:
and the early warning unit is connected with the early warning value calculation unit and used for generating different early warning signals according to different early warning values so as to remind personnel to take corresponding measures.
Preferably, the method comprises the following steps: the early warning unit includes:
the primary early warning unit is used for generating and sending first early warning information when the second limit value is less than or equal to the Lv and less than or equal to the first limit value so as to remind personnel to take first measures;
the contribution degree calculating unit is used for calculating the contribution degree of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet on the early warning value Lv according to formulas (2) to (4) when the third limit value is less than Lv and less than or equal to the second limit value;
the secondary early warning unit is connected with the contribution degree calculation unit and is used for generating and sending second early warning information when the contribution degree of any one of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet is less than or equal to a second limit value so as to remind personnel of taking a second measure;
and the third-level early warning unit is used for generating and sending third early warning information when Lv is less than a third limit value so as to remind personnel to take a third measure.
According to the invention, different parts of the negative pressure pipeline for reducing the dust concentration and the whole air volume are effectively monitored in an alarm and early warning mode, and in the process of acquiring the early warning value, the contribution degree of the real-time air volume of different parts to the early warning value is fully considered to generate different early warning signals and realize graded early warning, so that the situations of wrong report and missed report generated in the process of alarming and early warning by adopting the air volume of a single part are avoided, and the accuracy of dust explosion-proof early warning is improved.
Drawings
FIG. 1 is a schematic connection diagram of a negative pressure ventilation duct and an air volume sensor according to the present invention;
FIG. 2 is a flow chart of a dust explosion-proof air volume monitoring method according to the present invention;
FIG. 3 is a structural diagram of a dust explosion-proof air volume monitoring system according to the present invention;
fig. 4 is a structural diagram of the early warning unit of the present invention.
Detailed Description
For the convenience of understanding, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment provides a dust explosion-proof air volume monitoring method, as shown in fig. 1-2, which includes the following steps:
s1, acquiring air inlet air volume at an air inlet 101, middle air volume at a pipeline middle part 102 and air outlet air volume data at an air outlet 103 of a negative pressure ventilation pipeline 100 within a certain period (such as at least one month); the negative pressure ventilation pipeline 100 is used for discharging dust in the first area to the second area through negative pressure so as to reduce the dust concentration in the first area, thereby preventing dust explosion in the first area due to overhigh dust concentration, for example, the negative pressure ventilation pipeline is communicated with a mine and an external atmosphere environment, and the dust in the mine is discharged to the second area through negative pressure so as to reduce the dust concentration in the mine and prevent dust explosion;
respectively calculating the air volume average value and the air volume variance of the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time on the assumption that the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time belong to normal distribution, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
s2, correspondingly arranging an air inlet air quantity sensor S1, a middle air quantity sensor S2 and an air outlet air quantity sensor S3 at the air inlet 101, the pipeline middle part 102 and the air outlet 103 of the negative pressure ventilation pipeline 100 respectively so as to correspondingly monitor the real-time air quantity of the air inlet 101, the pipeline middle part 102 and the air outlet 103 of the negative pressure ventilation pipeline 100 and correspondingly obtain the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet of the negative pressure ventilation pipeline 100;
in the real-time monitoring process, if one or more of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is lower than a corresponding alarm threshold value, the air volume at the moment is not enough to timely reduce the dust concentration in the area, dust explosion is very likely to occur, and an alarm signal (such as various sound and light alarm signals and the like) is directly generated at the moment; in this embodiment, when the real-time air volume T of the air inlet is less than or equal to 30M 3 Min and/or middle real-time air volume M less than or equal to 25M 3 Min and/or the real-time air quantity of an air outlet is less than or equal to 20M 3 Generating an alarm signal at/min;
s3, if any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is not lower than the corresponding alarm threshold value, calculating an early warning value Lv according to the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet, the corresponding average value of the air volume and the corresponding variance of the air volume, wherein a calculation formula (1) of the early warning value Lv is as follows:
and S4, generating different early warning signals according to different early warning values so as to remind personnel to take corresponding measures.
Specifically, the step S4 includes:
if the Lv is larger than or equal to the first limit value, the whole air quantity of the pipeline is enough, dust can be discharged in time, and early warning is not needed;
if the second limit value is less than or equal to the first limit value and less than or equal to the Lv, the whole air volume is still enough, but the attention needs to be paid properly, and at the moment, first early warning information is generated and sent to remind personnel to take first measures; the first warning information includes a warning value Lv at this time, and the first measure includes: personnel can remotely monitor the site by calling site videos and the like, but do not need to perform site processing;
if the third limit value is less than the Lv and less than or equal to the second limit value, calculating the contribution degrees of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet to the early warning value Lv according to formulas (2) to (4); and when the contribution degree of any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is less than or equal to a second limit value, it is indicated that the real-time air volume is at a too low risk, second early warning information is generated and sent at the moment to remind personnel to take a second measure, the second early warning information comprises the real-time air volume of which the contribution degree is less than or equal to the second limit value and/or the contribution degree of the real-time air volume and/or an early warning value Lv at the moment, and the second measure comprises the following steps: informing field workers to avoid evacuation, and dispatching personnel and/or equipment to observe and process on site;
if Lv is less than the third limit value, it indicates that the overall air volume of the negative pressure pipeline is relatively low and the dust concentration cannot be reduced in time due to the comprehensive influence of the structure, material and trend of each part of the negative pressure pipeline, so as to reach the degree that dust explosion is easily generated, and third early warning information is generated and sent to remind personnel to take a third measure; the third warning information includes a warning value Lv at this time, and the third measure includes: and reporting the condition, stopping production, informing field workers to evacuate, and dispatching professional personnel and/or equipment to carry out field processing.
In the above steps, the determination of the first limit value to the third limit value may be determined according to actual monitoring requirements, and the severity of the early warning information is that the first early warning information is less than the second early warning information and less than the third early warning information in sequence.
In the dust explosion prevention, the larger the air volume of the negative pressure pipeline is, the better the ventilation condition of a place is, the more difficult the dust explosion is, so the air volume has the lowest value, and if the air volume is smaller than the lowest value, the air volume is too small, the dust concentration cannot be timely reduced, and the risk of causing dust explosion is increased. Therefore, the quantitative change characteristics of the air volume of different parts of the negative pressure pipeline can be obtained in real time in the quantitative change process through the formulas (1) to (4), the digitization of the early warning process and the real-time air volume monitoring of the production process are realized, the air volume can be related to the dust concentration, namely the change condition of the dust concentration is predicted through the air volume, the hidden danger is solved with the minimum cost in advance, the accident is eliminated in the bud state, and the production cannot be influenced.
Example 2:
the embodiment provides a dust explosion-proof air volume monitoring system for implementing the monitoring method described in embodiment 1, as shown in fig. 1 and 3, the dust explosion-proof air volume monitoring system includes:
a historical data statistical unit 1, configured to obtain air inlet air volume at an air inlet 101, middle air volume at a middle 102, and air outlet air volume data at an air outlet 103 of the negative pressure ventilation duct 100 within a certain period (for example, at least one month); respectively calculating the air volume average value and the air volume variance of the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time on the assumption that the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time belong to normal distribution, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
the air quantity sensors comprise an air inlet air quantity sensor S1 arranged at an air inlet 101 of the negative pressure ventilation pipeline 100, a middle air quantity sensor S2 arranged at a pipeline middle part 102 of the negative pressure ventilation pipeline 100 and an air outlet air quantity sensor S3 arranged at an air outlet 103 of the negative pressure ventilation pipeline 100, so as to correspondingly monitor the air inlet 101, the pipeline middle part 102 and the air outlet 103 of the negative pressure ventilation pipeline 100 in real time and correspondingly obtain an air inlet real-time air quantity T, a middle real-time air quantity M and an air outlet real-time air quantity R of the negative pressure ventilation pipeline 100;
the alarm unit 2 is connected with the air inlet air quantity sensor S1, the middle air quantity sensor S2 and the air outlet air quantity sensor S3 and is used for directly generating an alarm signal when one or more of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is lower than a corresponding alarm threshold value;
the early warning value calculation unit 3 is connected with the air inlet air quantity sensor S1, the middle air quantity sensor S2, the air outlet air quantity sensor S3 and the historical data statistics unit 1, and is used for calculating an early warning value Lv according to the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R and the corresponding air quantity average value and air quantity variance when any one of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is not lower than a corresponding alarm threshold, and a calculation formula (1) of the early warning value Lv is as follows:
and the early warning unit 4 is connected with the early warning value calculation unit 4 and used for generating different early warning signals according to different early warning values so as to remind personnel to take corresponding measures.
Specifically, as shown in fig. 4, the early warning unit 4 includes:
the primary early warning unit 41 is used for generating and sending first early warning information when the second limit value is less than or equal to the Lv and less than or equal to the first limit value so as to remind personnel to take a first measure;
the contribution degree calculating unit 42 is used for calculating the contribution degree of the air inlet real-time air volume T, the middle real-time air volume M and the air outlet real-time air volume R to the early warning value Lv according to the formulas (2) - (4) when the third limit value is less than Lv and less than or equal to the second limit value;
the secondary early warning unit 43 is connected with the contribution degree calculation unit 42, and is used for generating and sending second early warning information when the contribution degree of any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is less than or equal to a second limit value so as to remind personnel to take a second measure;
and the third-level early warning unit 44 is used for generating and sending third early warning information when Lv is less than a third limit value so as to remind personnel to take a third measure.
The first to third measures and the negative pressure pipeline are the same as those in embodiment 1, and are not described again.
Therefore, the invention adopts the mode that the real-time air volume of a single part exceeds the corresponding alarm threshold value, namely alarm and graded early warning, to accurately and comprehensively monitor the different parts and the whole air volume of the negative pressure pipeline, obtains the quantitative change characteristic of the air volume in real time, can correlate the air volume with the dust concentration, namely predicts the change condition of the dust concentration through the air volume, realizes the digitization of the early warning process and the real-time data monitoring of the production process, aims to solve the hidden trouble at the minimum cost in advance, eliminates the accident in the bud state, and does not influence the production; particularly, in a grading early warning mechanism, real-time air volume of different parts of the negative pressure pipeline is taken into consideration by a formula (1), so that the situations of false alarm and missed alarm generated when a single part of air volume is adopted for warning and early warning are fully avoided, the accuracy of early warning is improved, and meanwhile, early warning information of different levels is generated by combining the contribution degrees of the real-time air volume of different parts to an early warning value, so that sufficient processing time is reserved for a person, the person is reminded that the real-time air volume of the part of the negative pressure pipeline is close to a dangerous level, precious measures are taken for the part conveniently, and the time waste caused by one-by-one troubleshooting is avoided.
The technical features of the above embodiments 1-2 can be combined arbitrarily, and the combined technical solutions all belong to the protection scope of the present invention. And it will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, device or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A dust explosion-proof air volume monitoring method is characterized by comprising the following steps:
s1, acquiring air inlet air quantity at an air inlet of a negative pressure ventilating duct, middle air quantity at the middle part of the duct and air outlet air quantity data at an air outlet in a certain period; the negative pressure ventilation pipeline is used for discharging dust in the first area to the second area through negative pressure so as to reduce the dust concentration in the first area and prevent dust explosion in the first area;
respectively calculating the air volume average value and the air volume variance of the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time on the assumption that the air volume of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time belong to normal distribution, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
s2, respectively and correspondingly arranging an air inlet air quantity sensor, a middle air quantity sensor and an air outlet air quantity sensor at the air inlet, the middle of the pipeline and the air outlet of the negative pressure ventilating pipeline so as to correspondingly monitor the air inlet, the middle of the pipeline and the air outlet of the negative pressure ventilating pipeline in real time and correspondingly obtain the real-time air quantity T of the air inlet, the real-time air quantity M of the middle and the real-time air quantity R of the air outlet of the negative pressure ventilating pipeline;
s3, if any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is not lower than the corresponding alarm threshold value, calculating an early warning value Lv according to the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet, the corresponding average value of the air volume and the corresponding variance of the air volume, wherein a calculation formula (1) of the early warning value Lv is as follows:
s4, generating different early warning signals according to different early warning values to remind personnel to take corresponding measures;
the step S4 includes: if the second limit value is less than or equal to the first limit value and less than or equal to the Lv, first early warning information is generated and sent to remind personnel to take first measures;
if the third limit value is less than or equal to the second limit value and less than or equal to the second limit value, calculating the contribution degree of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet to the early warning value Lv according to formulas (2) to (4); when the contribution degree of any one of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is less than or equal to a second limit value, second early warning information is generated and sent to remind personnel of taking a second measure;
2. the dust explosion-proof air volume monitoring method according to claim 1, wherein if one or more of the real-time air volume T of the air inlet, the real-time air volume M of the middle part and the real-time air volume R of the air outlet is lower than a corresponding alarm threshold, an alarm signal is directly generated.
3. The dust explosion-proof air volume monitoring method as set forth in claim 1, wherein when the real-time air volume T of the air inlet is less than or equal to 30M 3 Min and/or middle real-time air volume M less than or equal to 25M 3 Min and/or the real-time air quantity of an air outlet is less than or equal to 20M 3 And directly generating an alarm signal at min.
4. The dust explosion-proof air volume monitoring method according to claim 1, wherein the step S4 includes: and if Lv is less than the third limit value, generating and sending third early warning information to remind personnel to take third measures.
5. A dust explosion-proof air volume monitoring system for realizing the monitoring method of any one of claims 1 to 4, which is characterized by comprising the following steps:
the historical data statistical unit is used for acquiring air inlet air quantity at an air inlet of the negative pressure ventilating duct, middle air quantity at the middle part of the duct and air outlet air quantity data at an air outlet in a certain period; respectively calculating the air volume average value and the air volume variance of the air inlet, the air volume of the middle part and the air volume of the air outlet in the period of time, wherein the air volume average value and the air volume variance are the air volume average value tv of the air inlet, the air volume variance dt of the air inlet, the air volume average value mv of the middle part, the air volume variance dm of the middle part, the air volume average value rv of the air outlet and the air volume variance dr of the air outlet;
the air quantity sensors comprise an air inlet air quantity sensor arranged at an air inlet of the negative pressure ventilating duct, a middle air quantity sensor arranged at the middle part of a pipeline of the negative pressure ventilating duct and an air outlet air quantity sensor arranged at an air outlet of the negative pressure ventilating duct, so as to correspondingly monitor the real-time air quantity of the air inlet, the middle part of the pipeline and the air outlet of the negative pressure ventilating duct and correspondingly obtain the real-time air quantity of the air inlet, the real-time air quantity of the middle part and the real-time air quantity of the air outlet of the negative pressure ventilating duct;
the alarm unit is connected with the air inlet air quantity sensor, the middle air quantity sensor and the air outlet air quantity sensor and is used for directly generating an alarm signal when one or more of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is lower than a corresponding alarm threshold value;
and the early warning value calculating unit is connected with the air inlet air quantity sensor, the middle air quantity sensor, the air outlet air quantity sensor and the historical data statistical unit and is used for calculating an early warning value Lv according to the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R and the corresponding air quantity average value and air quantity variance when any one of the air inlet real-time air quantity T, the middle real-time air quantity M and the air outlet real-time air quantity R is not lower than the corresponding warning threshold value, and the calculation formula (1) of the early warning value Lv is as follows:
and the early warning unit is connected with the early warning value calculation unit and used for generating different early warning signals according to different early warning values so as to remind personnel to take corresponding measures.
6. The dust explosion-proof air volume monitoring system of claim 5, comprising: the early warning unit includes:
the primary early warning unit is used for generating and sending first early warning information when the second limit value is less than or equal to the Lv and less than or equal to the first limit value so as to remind personnel to take first measures;
the contribution degree calculating unit is used for calculating the contribution degree of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet on the early warning value Lv according to formulas (2) to (4) when the third limit value is less than Lv and less than or equal to the second limit value;
the secondary early warning unit is connected with the contribution degree calculation unit and is used for generating and sending second early warning information when the contribution degree of any one of the real-time air quantity T of the air inlet, the real-time air quantity M of the middle part and the real-time air quantity R of the air outlet is less than or equal to a second limit value so as to remind personnel of taking a second measure;
and the third-level early warning unit is used for generating and sending third early warning information when Lv is less than a third limit value so as to remind personnel to take a third measure.
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