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Ozone generator ozone concentration, production, power consumption measurement 1 Subject content and scope of application: This standard specifies the ozone concentration, output and power consumption of the ozone generator.
Applicable to the determination of electricity as an energy ozone generator.
2 noun terms Specific energy consumption
The equipment produces electrical energy consumed by the unit weight of the finished product.
3 Ozone generator ozone concentration, production, power consumption measurement and calculation method 3.1 Ozone concentration
3.1.1 Principle of the method: Ozone (O3) is a strong oxidant. It can be freed from iodine by reaction with potassium iodide (KI) solution. After sampling and acidifying the solution, 0.1000 mol/L sodium thiosulfate (Na2S2O3) is used. The standard solution was titrated with free iodine using a starch solution as an indicator, and the amount of ozone was calculated from the consumption of the sodium thiosulfate standard solution. Its reaction formula is:
18.104.22.168 Potassium iodide (KI) solution (20%): Dissolve 200 g of potassium iodide (analytical grade) in 1000 mL of distilled water cooled by boiling, store in a brown bottle in a refrigerator, and store at least one day. This solution 1.00 mL contains 0.20 g of potassium iodide.
22.214.171.124 (1+5) sulfuric acid (H2SO4) solution: Concentrated sulfuric acid (p=1.84; analytical grade) was dissolved in 5 volumes of distilled water.
126.96.36.199 C(Na2S2O3Â·5H2O)=0.1000mol/L sodium thiosulfate standard solution; use analytical balance to accurately weigh 24.817g sodium thiosulfate (Na2S2O3Â·5H2O; analytical grade) dissolved in distilled water cooled by fresh boiling In a 1000mL volumetric flask. Or weigh 25 g of sodium thiosulfate (Na2S2O3Â·5H2O; analytically pure) dissolved in 1000 mL of freshly boiled and cooled distilled water. The solution has a sodium thiosulfate concentration of about 0.1 mol/L. Add 0.2g sodium carbonate (Na2S0O3) or 5mL chloroform (CHCL3); calibrate, adjust the concentration to 0.1000mol/L, store in brown bottle, store for too long time, need to be recalibrated before use (see calibration method) Appendix A).
188.8.131.52 Starch solution; weigh 1g of soluble starch, mix it with cold water to form a suspension slurry, then add about 80mL of boiling water, stir while stirring, dilute to 100mL; boil for a few minutes, then deposit the precipitate overnight, take the supernatant for use, such as It takes a long time to store 1.25 g of salicylic acid or 0.4 g of zinc chloride.
3.1.3 Test equipment, equipment and requirements
184.108.40.206 Triangle wash bottle (absorption bottle) 500mL.
220.127.116.11 For the titration tube 50mL, a precision burette should be used.
18.104.22.168 Wet gas flow meter capacity 5L.
22.214.171.124 Measuring cylinder 20mL each 500mL.
126.96.36.199 Scale pipette (pipette) 10mL.
188.8.131.52 Volumetric flask 1000mL.
184.108.40.206 Polyethylene or polyvinyl chloride hose for the transport of ozone-containing gases. Do not use rubber hoses.
3.1.4 Experimental procedure and method: Measure 20mL potassium iodide solution (220.127.116.11), pour into 500mL absorption bottle, then add 350mL distilled water. After the ozone generator runs stably, sample at the ozonation gas outlet. Into the absorption bottle (18.104.22.168) to absorb the ozone and then measure the gas through the wet gas flow meter (22.214.171.124), the gas throughput is 2000mL (time control is about 4min), stop adding 5mL immediately after sampling (1+ 5) Sulfuric acid solution (126.96.36.199) (to reduce the pH to below 2.0) and shake well, let stand for 5 min. Titrate with 0.1000mol/L sodium thiosulfate standard deep solution (188.8.131.52). When the solution is light yellow, add a few drops (about 1mL) of the starch solution (184.108.40.206), and continue to carefully and quickly titrate the color disappears. . Record the amount of sodium thiosulfate standard solution.
3.1.5 Calculation of ozone concentration
Where: Co3--ozone concentration, mg/L;
ANa--sodium thiosulfate standard solution dosage, mL;
B - sodium thiosulfate standard solution concentration, mol / L;
V0 - ozonation gas sampling volume, mL;
When the ozone concentration is greater than or equal to 3 mg/L, the precision of this test result is within Â±1%.
3.2 Ozone production
3.2.1 Summary of Method Principle: The product of the ozone concentration value and the value of the total gas entering the ozone generator is the output.
3.2.2 Equipment, instruments and their requirements
220.127.116.11 Pressure gauge level 1.5
18.104.22.168 Gas Rotor Flowmeter Industrial Grade
3.2.3 Correction calculation of gas flow rate: The temperature and pressure of the gas to be measured when the flowmeter is used are often different from the calibration of the flowmeter. Therefore, the flow display value of the readings during use is often not a true reflection of the flow through the gas and must be corrected. Its formula is as follows:
QN=(PsTN/PNTs)1/2Â·Qs(m3/h or L/h) (4)
Where: QN--the actual gas flow rate under standard conditions, m3/h or L/h;
Qs--the measured flow rate of gas in the meter under measurement (test) state, m3/h or L/h;
Ps--measurement (test) state, gas pressure, Pa;
TN--the absolute temperature of the meter calibration, (273.15+20)K;
Ts--the temperature of the gas in the state of measurement (test);
PN--The absolute pressure at which the meter is calibrated (a standard atmospheric pressure of 1.01325 x 105 Pa).
3.2.4 Calculation of ozone production
Do3=Co3Â·QN(g or mg) (5)
Where 3-3 - ozone production, g or mg.
3.3 Power consumption
3.3.1 Outline of the principle of the method: The ratio of the measured electric power consumption of the ozone generator to the unit ozone output is the power consumption.
3.3.2 Equipment, instruments and their requirements.
22.214.171.124 Voltmeter (voltmeter) class 0.5.
126.96.36.199 Ammeter (amperometer) class 0.5.
188.8.131.52 Power meter (watt meter) level 0.5.
184.108.40.206 Electrostatic high voltage meter class 1.5.
220.127.116.11 Watt-hour meter 2.0.
3.3.3 Calculation of power consumption: The ratio of the cumulative value recorded in unit time and the ozone production per unit time measured by the power meter (wattmeter) (18.104.22.168) is the power consumption. The formula is as follows:
P=W/Do3 (WÂ·h/gÂ·O3 or kWÂ·h/kgÂ·O3) (6) or
P=AH/Do3 (WÂ·h/gÂ·O3 or kWÂ·h/kgÂ·O3) (7)
P--Ozone unit power consumption, WÂ·h/gÂ·O3 or kWÂ·h/kgÂ·O3;
W--electric power, W or kW;
AH--The cumulative value of the meter in unit time, kWÂ·h.
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