Gas Flow Meter |
| 03-06 08:49:21 来源： 作者： |
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Gas Flow Meter Inquiry (采购产品): Gas Flow Meter Hallo Sir or Madam, Phoenix Solutions is in the business of engineering and building the syngas production facility, using the high temperature plasma-arc technology. I am currently working on a new project where we are making a syngas out of used tire chips. The syngas is a new term used for synthetic gases whose constituents, in this case, are 48.8 % CO, 41.7 % H2, 4.0 % N2, 2.1 % CO2, 3.0 % H2O, 0.24 % H2S, 0.01 % CH4, 0.02 Argon and 0.001 % NH3. As a part of the guaranty to our customer, we need to accurately quantify the syngas production rate. To that end, we need to analyze the gas constituents and measure the volumetric flow rate of the syngas being produced in the new facility. For the first part of this task, we will need a good gas analyzer to “fingerprint” the CO, H2, CO2 and CH4 concentrations. Just for your info, we have already purchased the gas analyzer for other projects, so we are quite familiar with what we need here. Unless mistaken, we may not need any help from you on this. For the second part is the area where I think we’ll need your help. In past, I remember purchasing flow meters, probably for the steam metering. I am quite sure the flow meters were the venturi type. I don’t think we can use the orifice type due to restricting the gas flow. The mass flow meter is probably most accurate, but I hear it can’t be used here because of too high temperature around 1,000 oC (1,832 oF). Regarding the gas flow meter application, I can offer these design criteria. 1. We would expect considerable variation in the gas concentration, depending on how consistently we can charge the tire chips into the furnace. If you look at the concentration variation over one or two minutes, there would venture to guess +/- 10 % variation in hydrogen or carbon monoxide volume concentration. So we need to take a number of data points (say, one every minute) over one hour, then use the average concentration based of those data points. 2. We need to do the same for gas pressure in the duct, which will be normally maintained at about (-) 5” WC. So are the gas density and flow rate. 3. The normal flow rate will be maintained at about 25 m/sec (4,920 ft/min), to prevent ash in the gas stream settling out. 4. The flow meter accuracy would be dictated by the type of flow meter that can be used in this application since the meter choice will be limited by the high gas temperature. It could also be affected by the duct geometry – see the attached. 5. One technique to consider is pulling off a small side stream, cooling it and running it thru a mass flow meter, if the side stream can be accurately partitioned off. 6. Another thing to keep in mind is that the syngas is not completely free of fouling from ash and corrosiveness from HCl and H2SO4. Please let me know if you have any question or comment. Best regards, George Y. Bang Thermal and Chemical Process Engineer Phoenix Solutions Co. 3324 Winpark Drive Minneapolis, MN 55427-2063 USA 763-544-2721 Ext. 129 763-546-5617 Fax georgebang@phoenixsolutionsco.com **** Hidden Message ***** George Bang 55427 USA Company: Phoenix Solutions Co. Title: Process Engineer Phone: 763-544-2721 E-mail: georgebang@phoenixsolutionsco.com **** Hidden Message ***** georgebang@phoenixsolutionsco.com |
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