Method for electrostatic spark explosion suppression in environment with explosive possibility

Abstract

The invention discloses a method for electrostatic spark explosion suppression in an explosive possible environment, and mainly relates to the field of electrostatic spark explosion prevention. The method is mainly applied to monitoring the energy influence factors of the ignition source before electrostatic sparks are generated in equipment such as purifiers. Static electricity can be generated by friction of fluid in equipment such as purifiers or the fluid carries the static electricity before entering the equipment, so that the phenomenon of electric sparks generated by the static electricity often occurs, and even explosion in the purifiers is caused. Traditional explosion suppression mostly adopts electric spark detection, and measures are taken immediately after the electric spark is found. According to the technology, the voltage value, the change rate value, the electric quantity value and the change rate value of static electricity are monitored, then the monitored value is compared with the preset value, and measures are taken in advance before electric sparks are generated, so that explosion suppression is carried out more early and more safely.

Description

Technical Field

[0001] The present invention relates to the field of electrostatic spark explosion protection, and specifically to a method for suppressing electrostatic sparks in an environment with explosive potential. Background Art

[0002] Purifier devices such as deflakers, dust collectors, particle cleaners, separators, filters, etc. are used in many fields such as industrial production, chemical industry, and textile. Usually, due to working conditions, explosion protection measures are required to be designed for purifier devices. The main reason is that media such as gases, liquids, and materials flowing through these devices carry static electricity by themselves before entering the device, or static electricity is generated by friction between the materials and fluids themselves after entering the device, or static electricity is generated by friction between the materials, fluids and the device housing after entering the device. This may cause a discharge phenomenon in the purifier device, forming an electrostatic spark and causing major accidents such as gas explosion and dust explosion. Therefore, in actual work, the explosion protection requirements for using purifier devices in an environment with explosive potential have always been highly regarded.

[0003] Under the current technical conditions, the basic logic of the relatively common explosion protection measures is the explosion protection logic of detecting electrostatic sparks and immediately taking measures after detecting electrostatic sparks and the corresponding devices. Some negative losses will still occur after the measures are activated. The present invention provides a method for detecting the static electricity state in the purifier before the generation of electrostatic sparks, so as to suppress the electrostatic sparks at an earlier and more secure time.

[0004] The present invention aims to detect abnormal static electricity in the purifier earlier, be able to detect potential hazards of electrostatic sparks or explosions in the state before the generation of electrostatic sparks, and improve the safety of the purifier. Summary of the Invention

[0005] In order to scientifically and early warn of the generation of electrostatic sparks, the present invention provides a method for suppressing electrostatic sparks in an environment with explosive potential, which is applied to environments where static electricity is easily generated or accumulated in various purifiers, such as in devices such as deflakers, dust collectors, particle cleaners, separators, filters, bag filters, etc. The implementation of this method requires the cooperation of a monitoring part, a control system, and a feedback part; monitor the energy influence factors of the ignition source before the generation of electrostatic sparks, compare the monitored data with the preset values of the control system, and the feedback part outputs instructions to adjust the operation of the purifier.

[0006] Furthermore, the monitoring part monitors the static electricity voltage U in the purifier, compares the monitored static electricity voltage U value with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates the explosion suppression measures.

[0007] Further, the monitoring part monitors the change rate dU / dt of the static voltage U in the purifier per unit time, compares the monitored value of the voltage change rate dU / dt with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates the explosion suppression measures.

[0008] Further, the monitoring part monitors the static voltage U and the change rate dU / dt of the static voltage U in the purifier, compares the monitored voltage U value and the change rate dU / dt value with the first comprehensive preset value of the control system, and when the monitored voltage U value and / or the change rate dU / dt value is greater than the first comprehensive preset value, the feedback part operates the explosion suppression measures.

[0009] Further, the monitoring part monitors the static electricity quantity Q in the purifier, compares the monitored value of the static electricity quantity Q with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates the explosion suppression measures.

[0010] Further, the monitoring part monitors the change rate dQ / dt of the static electricity quantity Q in the purifier per unit time, compares the monitored value of the electricity quantity change rate dQ / dt with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates the explosion suppression measures.

[0011] Further, the monitoring part monitors the static electricity quantity Q and the change rate dQ / dt of the static electricity quantity Q in the purifier, compares the monitored electricity quantity Q value and the change rate dQ / dt value with the second comprehensive preset value of the control system, and when the monitored electricity quantity Q value and / or the change rate dQ / dt value is greater than the second comprehensive preset value, the feedback part operates the explosion suppression measures.

[0012] Further, the monitoring part monitors the static voltage U, the static electricity quantity Q, the change rate dU / dt value of the static voltage U, and the change rate dQ / dt value of the static electricity quantity Q in the purifier, compares the monitored voltage U value, the voltage change rate dU / dt value, the electricity quantity Q value, and the electricity quantity change rate dQ / dt value with the third comprehensive preset value of the control system, and when any one or more of the monitored voltage U value, the voltage change rate dU / dt value, the electricity quantity Q value, and the electricity quantity change rate dQ / dt value is greater than the third comprehensive preset value, the feedback part operates the explosion suppression measures.

[0013] Further, the preset values of the control system are divided into three types. The first type is the set value or the comprehensive set value, the second type is the dangerous set value or the dangerous comprehensive set value, and the third type is the stop operation set value or the stop operation comprehensive set value.

[0014] Further, when the monitored value reaches the first set value or the comprehensive set value, the feedback part takes the explosion suppression measure of giving an audible and visual alarm; when the monitored value reaches the second dangerous set value or the dangerous comprehensive set value, the feedback part takes the explosion suppression measure of filling nitrogen or carbon dioxide gas or a flame-retardant substance into the purifier; when the monitored value reaches the third shutdown set value or the shutdown comprehensive set value, the feedback part takes the explosion suppression measure of interlocking the shutdown of the purifier. Description of the Drawings

[0015] Figure 1 is the logic principle flowchart of the embodiment of the electrostatic spark explosion suppression method Detailed Description of the Invention

[0016] The following describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0017] Figure 1 is the logic principle flowchart of the embodiment of the electrostatic spark explosion suppression method. As shown in the figure, the implementation process of this method needs to be completed by the cooperation of the monitoring part, the control system, and the feedback part. The monitoring part monitors the energy influence factor of the ignition source before the generation of electrostatic sparks, compares the monitored data with the preset value of the control system, and then the feedback part outputs an instruction to adjust the operation of the purifier according to the comparison result of the monitored data and the preset value.

[0018] The monitoring part monitors the electrostatic voltage U in the purifier, compares the monitored electrostatic voltage U value with the preset value of the control system, and only when it is greater than the preset value, the feedback part operates the explosion suppression measure.

[0019] The monitoring part monitors the rate of change dU / dt of the electrostatic voltage U per unit time in the purifier, compares the monitored voltage rate of change dU / dt value with the preset value of the control system, and only when it is greater than the preset value, the feedback part operates the explosion suppression measure.

[0020] The monitoring part monitors the electrostatic voltage U and the rate of change dU / dt of the electrostatic voltage U in the purifier, compares the monitored voltage U value and the rate of change dU / dt value with the first comprehensive preset value of the control system, and only when the voltage U value and / or the rate of change dU / dt value is greater than the first comprehensive preset value, the feedback part operates the explosion suppression measure.

[0021] The monitoring part monitors the electrostatic charge Q in the purifier, compares the monitored electrostatic charge Q value with the preset value of the control system, and only when it is greater than the preset value, the feedback part operates the explosion suppression measure.

[0022] The monitoring part monitors the change rate dQ / dt of the static electricity quantity Q per unit time in the purifier, compares the monitored value of the change rate of the electricity quantity dQ / dt with the preset value of the control system, and only when it is greater than the preset value, the feedback part operates the explosion suppression measures.

[0023] The monitoring part monitors the static electricity quantity Q and the change rate dQ / dt of the static electricity quantity Q in the purifier, compares the monitored value of the electricity quantity Q and the change rate dQ / dt with the second comprehensive preset value of the control system, and only when the value of the electricity quantity Q and / or the change rate dQ / dt is greater than the second comprehensive preset value, the feedback part operates the explosion suppression measures.

[0024] The monitoring part monitors the static electricity voltage U, the static electricity quantity Q, the change rate dU / dt of the static electricity voltage U, and the change rate dQ / dt of the static electricity quantity Q in the purifier, compares the monitored values of the voltage U, the change rate of the voltage dU / dt, the electricity quantity Q, and the change rate of the electricity quantity dQ / dt with the third comprehensive preset value of the control system, and only when any one or more of the monitored values of the voltage U, the change rate of the voltage dU / dt, the electricity quantity Q, and the change rate of the electricity quantity dQ / dt are greater than the third comprehensive preset value, the feedback part operates the explosion suppression measures.

[0025] The preset values of the control system are divided into three levels. The first is the set value or the comprehensive set value, the second is the dangerous set value or the dangerous comprehensive set value, and the third is the stop operation set value or the stop operation comprehensive set value.

[0026] When the monitored value reaches the first set value or the comprehensive set value, the feedback part takes the explosion suppression measure of acoustic and optical alarm; when the monitored value reaches the second dangerous set value or the dangerous comprehensive set value, the feedback part takes the explosion suppression measure of filling nitrogen or carbon dioxide gas or a flame-retardant substance into the purifier; when the monitored value reaches the third stop operation set value or the stop operation comprehensive set value, the feedback part takes the explosion suppression measure of interlocking shutdown of the purifier.

[0027] The principle of this method: The fluid inside the purifier will generate static electricity due to the mutual friction inside the fluid or the friction between the fluid and other substances inside the purifier; or the fluid already has static electricity before entering the purifier. The static electricity of these fluids accumulates inside the purifier and will cause static electricity discharge after accumulating to a certain extent. The use environment of the purifier is mostly accompanied by sensitive areas of gas explosion or dust explosion. Therefore, the generation of static electricity sparks poses a great threat to production. Therefore, the discharge can be effectively suppressed before the static electricity accumulates to generate electric sparks, which is an important progress in the aspect of explosion suppression of static electricity sparks in production.

[0028] For the analysis of the characteristics of static electricity, there are index values for static voltage and static charge. Therefore, this method selects to monitor the voltage value and change rate value, charge value and change rate value of static electricity inside the purifier. Monitoring the values of static voltage and static charge is relatively intuitive. Monitoring the change rate values of static voltage and static charge per unit time will enable users to understand the regularity of fluid static electricity accumulation inside the purifier. When these selected index values are too large, starting from aspects such as reducing the oxygen concentration or combustible gas concentration inside the purifier or reducing the energy of the static ignition source, timely intervention is carried out inside the purifier to effectively prevent the danger of explosion caused by static sparks in actual production.

[0029] This method proposes that single-index determination can be selected. For example, the voltage U value or charge Q value of static electricity, or the voltage change rate dU / dt value or charge change rate dQ / dt value of static electricity can be measured separately; composite-index determination can also be selected, and a composite value is used to evaluate the prevention of static sparks. For example, two or more of the voltage U value, charge Q value, voltage change rate dU / dt value, and charge change rate dQ / dt value of static electricity are used for monitoring.

[0030] After determining the monitoring index, the monitoring location can be selected at the position where fluid static electricity in the purifier is prone to accumulate for monitoring, or multi-point monitoring can be carried out throughout the purifier.

[0031] After determining the monitoring part, it needs to be defined in the control system. According to the requirements of the working conditions and the empirical analysis of the characteristics of fluid static electricity, the preset values are matched for programming or logic design. The preset values in this method are the general term for the numerical indexes artificially set in the control system. Here, the preset values are divided into set values or composite set values, danger set values or danger composite set values, stop-operation set values or stop-operation composite set values, and their mutual relationship is set value or composite set value < danger set value or danger composite set value < stop-operation set value or stop-operation composite set value. The monitored values are the numerical indexes obtained by measuring the monitoring part.

[0032] The control system outputs instructions according to the comparison result of the monitored value and the preset value, and the feedback part makes a response. There are a total of 3 response methods: sound and light alarm, filling nitrogen or carbon dioxide gas or flame-retardant substances into the purifier, and the purifier is interlocked to stop. Users can select one or more response methods according to the situation to cooperate for feedback to suppress the explosion of static sparks.

[0033] An embodiment of this method is as follows: when the set value or the comprehensive set value < the monitored value < the danger set value or the danger comprehensive set value, the feedback part operates the explosion suppression measure of sound and light alarm; when the danger set value or the danger comprehensive set value < the monitored value < the stop operation set value or the stop operation comprehensive set value, the feedback part operates the explosion suppression measure of filling nitrogen or carbon dioxide gas or a flame retardant substance into the purifier; when the stop operation set value or the stop operation comprehensive set value < the monitored value, the feedback part operates the explosion suppression measure of the purifier interlocking shutdown.

Claims

1. A method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards, characterized in that, it is applied to the environment in various purifiers where static electricity is likely to be generated or accumulated easily, including a monitoring part, a control system, and a feedback part; the energy influencing factors of the ignition source before the generation of electrostatic sparks are monitored, and after comparing the monitored data with the preset values of the control system, the feedback part outputs instructions to adjust the operation of the purifier.

2. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the static voltage U in the purifier, compares the monitored value of the static voltage U with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates explosion suppression measures.

3. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the rate of change dU / dt of the static voltage U per unit time in the purifier, compares the monitored value of the voltage rate of change dU / dt with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates explosion suppression measures.

4. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the static voltage U and the rate of change dU / dt of the static voltage U in the purifier, compares the monitored values of the voltage U and the rate of change dU / dt with the first comprehensive preset value of the control system, and when the monitored values of the voltage U and / or the rate of change dU / dt are greater than the first comprehensive preset value, the feedback part operates explosion suppression measures.

5. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the static electricity quantity Q in the purifier, compares the monitored value of the static electricity quantity Q with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates explosion suppression measures.

6. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the rate of change dQ / dt of the static electricity quantity Q per unit time in the purifier, compares the monitored value of the electricity quantity rate of change dQ / dt with the preset value of the control system, and when the monitored value is greater than the preset value, the feedback part operates explosion suppression measures.

7. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, the monitoring part monitors the static electricity quantity Q and the rate of change dQ / dt of the static electricity quantity Q in the purifier, compares the monitored values of the electricity quantity Q and the rate of change dQ / dt with the second comprehensive preset value of the control system, and when the monitored values of the electricity quantity Q and / or the rate of change dQ / dt are greater than the second comprehensive preset value, the feedback part operates explosion suppression measures.

8. The method for suppressing explosion caused by electrostatic sparks in an environment with potential explosion hazards according to claim 1, characterized in that, The monitoring part monitors the static voltage U, static charge Q, the change rate dU / dt of the static voltage U, and the change rate dQ / dt of the static charge Q in the purifier, and compares the monitored voltage U value, voltage change rate dU / dt value, charge Q value, and charge change rate dQ / dt value with the third comprehensive preset value of the control system. When any one or more of the monitored values of the voltage U value, voltage change rate dU / dt value, charge Q value, and charge change rate dQ / dt value are greater than the third comprehensive preset value, the feedback part operates the explosion suppression measures.

9. The method for suppressing explosion against electrostatic sparks in an environment with potential explosiveness according to claims 1-8, characterized in that, The preset values of the control system are divided into three levels. The first level is the set value or comprehensive set value, the second level is the danger set value or danger comprehensive set value, and the third level is the stop operation set value or stop operation comprehensive set value. The mutual relationship is that the set value or comprehensive set value < the danger set value or danger comprehensive set value < the stop operation set value or stop operation comprehensive set value.

10. The method for suppressing explosion against electrostatic sparks in an environment with potential explosiveness according to claims 1-8, characterized in that, When the set value or comprehensive set value < the monitored value < the danger set value or danger comprehensive set value, the feedback part operates the explosion suppression measures of audible and visual alarms; when the danger set value or danger comprehensive set value < the monitored value < the stop operation set value or stop operation comprehensive set value, the feedback part operates the explosion suppression measures of filling nitrogen or carbon dioxide gas or flame-retardant substances into the purifier; when the stop operation set value or stop operation comprehensive set value < the monitored value, the feedback part operates the explosion suppression measures of interlocking shutdown of the purifier.

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