[Stoves] печи

Sun Dec 18 12:32:00 CST 2011

Dear Yuri

I am complimenting you on the solution you propose for the following problem (running the stove below the rated power).

From your website:

“В наше время этот принцип сжигания топлива заложен в котлах Стропува, литовского производства. Горит он от нескольких часов до нескольких суток. Горит не плохо. Но есть проблема, при сжигании топлива в малых интервалах мощностей на стенках котла осаждается дёготь. Это дурно пахнущая тягучая жидкость, запах от которой нельзя передать. При постоянном подходе к котлу этот дурной запах переносится на одежду. Причиной этого явления является то, что температура в очаге горения не достаточна для того чтобы полностью испарить горючие смолы.”

In our time this principle was clear in the combustion boilers for Stropuva, Lithuanian production. When it is lit for a few hours to several days at a time burning is not bad. But there is a problem with fuel combustion for shorter intervals which is deposition of tar on the inside walls of the boiler. This is a bad-smelling viscous liquid, the smell of which cannot be removed. If you are constantly near to the boiler, this odor is transferred to the clothing. The reason for this phenomenon is that the combustion temperature is not high enough to fully evaporate the flammable resin.

The direct cause is excessive removal of heat from a system optimised to operate at a higher power level.  The solution which you have also implemented is reducing the size of the chamber and at the same time increasing the thickness of the brick (to reduce the rate of heat extraction). The combination should eliminate the formation of tars. This problem we see in a lot of domestic stoves that are left burning for a long time. As the heat exchanger is built for high power (useful in mid-winter) it takes out too much heat at times when the fuel load is small or when the fire is dying down. When burning coal it can lead to PM emissions late into the burn because of sub-optimal combustion conditions. 

The conical shape (larger at the top than the bottom) is the same solution developed in Ulaanbaatar and I am happy to hear confirmation of this approach from the Caucuses. As the gases combust and create a larger volume of combustion products, the conical combustion chamber volume is increased to maintain a (reasonably) constant gas velocity. The result is that the combustion chamber can be quite small while still giving an acceptable heat exchange efficiency.

View from the top:

Description: Description: cid:image003.jpg at 01CCBD87.8E0FDA60

3D drawing: The grooved blocks of ceramic are secondary air entrances. The fuel is stored between the black plates. The grate sits between the blue plates.

Description: cid:image004.jpg at 01CCBD89.64F838A0

The system was able to achieve long periods of burn with CO emissions of less than 10 mg/m3 at a power of 5-7 kW. The thermal efficiency is just over 80% (as a space heater). Cooking efficiency is about 25%.

The dropping plate shown at  30-10-2011 20:38 is very interesting. Very. It might also be employed to make small charcoal producing cookers because it brings the gases into a confined space for burning above.

Regards

Crispin

Здравствуйте!

Я из России. У меня много печей и котлов, которые я придумал сам

Все они находятся в моём блоге, по адресу:

 <http://blogs.mail.ru/list/user-05/> http://blogs.mail.ru/list/user-05/ 

Если хотите, можете вводить их в рассылки. С уважением, Юрий

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Hello!
I am from Russia. I have a lot of furnaces and boilers, which I invented myself
All of them are on my blog at:
http://blogs.mail.ru/list/user-05/
If you prefer, you can enter them in the mail. Regards, Yuri

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