I believe you are mistaken. The round white end is the insulating ceramic. If you look closely, you can barely see the protruding electrode. The ground electrode can not be clearly seen. Either it can not be seen in this picture due to its angle or it has been cut off.
Cutting off the ground electrode is not as unusual and crazy as you might first think. Realize that the entire outer body of the spark plug is intended to be the ground potential. It is quite easy for DGT to provide an alternative ground electrode. That way, they can adjust spark gap distance. I do this myself for my Arc Discharge nanotube reactor. I buy a long reach spark plug (long threaded part), I cut it down, then cut down the ceramic insulator to expose the electrode core. Then I insert it into a cylinder and ground the cylinder. This allows me to vary the spark distance by varying the diameter of the cylinder. Simple solution. Solves the fouling problem that I run into a lot in my early designs. Jojo ----- Original Message ----- From: Alain Sepeda To: [email protected] Sent: Monday, July 16, 2012 4:53 AM Subject: Re: [Vo]:Harping on the Right Things! what photography are you looking ? this one clearly is imcompatible with a spark plug. see the round end. for the glowplug, the standard diesel one are made to heat quickly to high temperature (few seconds). DGT tell that their control method was to quickly heat the reactor, so that it trigger the reaction.when temperature fall, they trigger again... absolutely compatible with that kind of plug. maybe they use a variant which is more tough than usual, or maybe is the frequency so low that it works nicely for long period. nice engineering solution. 2012/7/15 Robert Dorr <[email protected]> I had a look at the multi-page Defkalion press release May of 2012, and on page 18 of the 35 page document there is a picture of one of the spark plugs laying on a table. It is somewhat unusual in that it has a very long threaded body. I did some looking and found a similar plug from Ford Motorcraft Number SP-509. They are almost the same, short of a body that is not quite threaded all the way to the tip. Anyway I have to say that it most certainly a spark plug and not a glow plug. Robert Dorr At 12:44 PM 7/15/2012, you wrote: I supposed DGT can replace spark plug for glow plugs to misdirect, but that would still not explain the temp spike. Sparks are the only mechanism that can bring H2 temps that high and then quickly back down again. Glow plugs will not result in a temp spike. When you look at the end plates of DGT reactors, you will notice that the thermocouples are very close to the spark plug. A series of sparks would quickly raise the temperature of the H2 gas in the vicinity of the sparks, which is also where the thermocouples are. Then a second later, the hot H2 gas diffuses and the temps are down again. Hence a temp spike. Jojo ----- Original Message ----- From: Bob Higgins To: [email protected] Sent: Monday, July 16, 2012 3:19 AM Subject: Re: [Vo]:Harping on the Right Things! After surfing the different glow plugs on the web, I believe that Jojo is correct, that what is shown in the pictures offered by DGT are probably spark plugs. However, might there be misdirection in DGT's pictures? Would a glow plug screw in place of the spark plug in their reactor? DGT could have put the spark plugs in their reactor for the pictures, while they normally use glow plugs in those positions. The spare spark plug on the table was obvious and suspiciously left in the open. Another possibility is that DGT found that the glow plugs were wearing out too quickly and they modified their reactor for a different type of heater that would have greater life. Since they were left with the tapped glow plug holes, they plugged the holes with the spark plugs. The spark plugs are never shown connected, but everything else is shown connected. The comment from W&M about DGT having trouble with the glow plugs not lasting long enough goes with what Jojo observes for a glow plug. I am not convinced either way. Bob On Sun, Jul 15, 2012 at 2:47 PM, Jojo Jaro <[email protected]> wrote: And only if you want to waste your money. Like I said, they don't last very long when used continously as would be the case if DGT were using these to heat their reactors. A heating cartridge would make more sense for heating. I tried using glow plugs in my first generation reactors with so-so results. They tend to overheat and melt your ingredients. Hard to control heat output. They are designed to heat fast and furious. Controllability is not an issue for their intended application as Diesel engine preheaters as they are fired only for a few seconds. but, even in their intended application in diesel engines, they are one of the more frequently failing items. Jojo PS. Those pictures are definitiely spark plugs. No question about it. ----- Original Message ----- From: Alain Sepeda To: [email protected] Sent: Monday, July 16, 2012 2:14 AM Subject: Re: [Vo]:Harping on the Right Things! using a glowplug for heating is very natural, since it is very resistant, cheap, and easy to find. -- Regards, Bob Higgins
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