Highenergyelectrostaticsparkgenerator大能量靜電火花發(fā)生器

1、High energy static spark generator Miao NanIndustrial Explosion Protection Institute, Northeastern UniversitymiaonandsgTel:1編輯pptWhat is high energy spark？High energy：E100J in nominalApplication：pmax, Kst, MEC etc. in 20L explosion chamber 2編輯ppt3編輯pptPrincipleHigh-voltage trigger; Low-

2、voltage arc-sustainThe left part of the electrodes is trigger circuit. The highest voltage of high voltage power supply U1 is 10kV, and the capacitance of trigger capacitor is very small. The right part of the electrodes is arc-sustaining circuit (main discharge circuit). The highest voltage of the

3、arc-sustaining power is around 1kV, and the main capacitance is large. The main energy is stored in the main capacitance. First, S3 is set to “on” to charge the main capacitor C2, which stores much energy. The voltage of C2 is not enough to break down the gap between the electrodes. Then S1 is set t

4、o “on”, C1 is charged to high voltage. Then S2 is set to “on”, and the gap between electrodes is broken down by C1 because its high voltage. Once the gap is broken down, energy in C2 is discharged by arc sustaining discharge, and the energy is released in the gap between the electrodes.4編輯pptControl

5、 boxFrontBack5編輯pptApparatus6編輯pptDust explosion testParameters: 1. pmax ，Kst 2. MECIgnition： Chemical Ignition, Electrostatic IgnitionDust： Lycopodium, HCMA (3-Hydroxy-4-methoxycinnamaldehyde)7編輯ppt1. pmax , Kst - Chemical Ignition-LycopodiumNo.C/(g/m3)pm /MPaKm /(MPam/s)11250.6077.35722500.71112.7

6、0232500.70313.14542500.70316.81455000.71817.17565000.68617.26575000.76415.92385000.77416.81795000.77417.891107500.70316.459117500.67216.871127500.75014.4021310000.69914.651pmax=0.734MPa，Kst=17.014/(MPam/s)8編輯ppt1. pmax , Kst - Chemical Ignition-HCMANo.C/(g/m3)pm /MPaKm /(MPam/s)11250.29714.25722500.

7、73624.77932500.72326.38942500.81527.52055000.95434.26165000.94136.58575000.92032.78087500.83132.82997500.83733.504107500.80733.0981110000.79628.899pmax=0.938MPa，Kst=34.542/(MPam/s)9編輯pptNo.C/(g/m3)pm /MPaKm /(MPam/s)11250.6426.28222500.67910.73432500.67610.55645000.71715.40455000.69512.52365000.7251

8、4.76077500.66712.88187500.64413.239910000.64212.363pmax=0.712MPa，Kst=14.229/(MPam/s)1. pmax , Kst - Electrostatic Ignition-Lycopodium10編輯pptNo.C/(g/m3)pm /MPaKm /(MPam/s)11250.27919.68022500.70130.32535000.86830.05647500.76430.414510000.78824.600pmax=0.868MPa，Kst=30.414/(MPam/s)1. pmax , Kst - Elect

9、rostatic Ignition-HCMA11編輯pptDustIgnition methodpmax/(MPa)(pE/ pC)/%Kst/(MPam/s)(KE/ KC)/%LycopodiumChemical 0.74395.8317.01483.63Electrostatic0.71214.229HCMAChemical 0.93892.5434.54288.05Electrostatic0.86830.4141. pmax , Kst - Test result12編輯pptpmax -Lycopodiumpmax -HCMAKst-LycopodiumKst-HCMA1. pma

10、x , Kst - Parameters as function of dust concentration, at two kinds of the ignition source13編輯pptPC=0.82839pE+0.15597 KC=1.06097KE+1.44067 KCKst in chemical ignition, (MPam/s);KEKst in electrostatic ignition, (MPam/s)。Goodness of fit： 0.97324PCPmax in chemical ignition, MPa;PEPmax in electrostatic

11、ignition, MPa.Goodness of fit：0.94824Reason：1. Ignition mechanism; 2.Actual Ignition energy1. pmax , Kst Analysis (Linear fitting)14編輯ppt2. MEC - Chemical Ignition-2.5kJNo.C/(g/m3)pm /MPaIgnition？100.028N2400.052N3400.058N4400.062N5450.396YNo.C/(g/m3)pm /MPaIgnition?100.028N2450.059N3450.067N4450.07

12、7N5500.076N6500.235YLycopodiumHCMAMEC=45g/m3MEC=50g/m315編輯ppt2. MEC Electrostatic Ignition-2.5kJNo.C/(g/m3)pm /MPaIgnition？100.006N2400.027N3450.009N4500.008N5500.021N6500.021N7550.335YNo.C/(g/m3)pm /MPaIgnition?100.006N2500.006N3750.008N4750.009N5750.008N6800.009N7800.252YLycopodiumHCMAMEC=55g/m3ME

13、C=80g/m316編輯ppt2. MEC Electrostatic Ignition-8kJNo.C/(g/m3)pm /MPaIgnition？100.006N2400.011N3400.008N4400.022N5450.327YNo.C/(g/m3)pm /MPaIgnition?100.006N2450.006N3450.009N4450.010N5500.011N6500.295YLycopodiumHCMAMEC=45g/m3MEC=50g/m317編輯pptIgnition MethodEnergy /kJMEClycopodium/(g/m3)MEC HCMA /(g/m3

14、)Chemical Ignition2.54550Electrostatic Ignition2.55580Electrostatic Ignition84550Comparison of MEC in chemical ignition and electrostatic ignitionFor the MEC test, the results with electrostatic ignition are higher than the chemical ignition, but they could be the same by increasing the nominal ener

15、gy of electrostatic ignition.2. MEC Analysis18編輯pptTest of Spark EnergyNominal Energy：energy stored in the capacitor. It is estimated for the spark energyEenergy in the capacitor, J;Ccapacitor values, F;Uvoltage of capacitor, VMeasured Energy：energy measured in integration methodEenergy measured, J;

16、ttime, s;uvoltage between the electrode, V;icurrent between the electrode, A19編輯pptTest principle20編輯pptCurrent and voltage curve as a function of time-200V-400V-600V-800V-1000VCapacitance is 0.022F21編輯pptVoltage of charge/VVoltage after ignite/VNominal Energy E1/JMeasured Energy E2/JDischarge efficiency E2/E1100%20343434125.428.8920345432119.627.69400571725323.918.78404581759294.816.76602663939451.811.47606703986469.711.78800686990683.49.78800626999653.89.3498610010585846.78.00Test Result22編輯pptDisc