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PER-EKO KSR 25 - what should the temperature of the exhaust be?

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  • Level 11  
    Hello and I am asking for advice. I have a 25 kW retort oven that heats the surface of a new house with an area of 120 m2. I use eco-peas with a calorific value of 28 GJ. I found out that the exhaust temperature at the boiler outlet is important. The higher the temperature, the less efficiency. My last test is 232 degrees. Boiler setpoint for set temperature 50 degrees: feed time 8 seconds, feed break 60 seconds, blowdown force 2 gear on ST37 controller. Hysteresis every 1 degree. The temperature sensor on the screw pipe at the flange is additionally installed on which is a constant temperature of 28.3 degrees. My question: what should the temperature of the exhaust be?
  • Level 26  
    300m2 you would warm this boiler ....
    I do not know what the temperature of the exhaust should be exactly in this boiler, but I will give you the measurements on the example of the 25 kW Ogniwo Eko Plus boilers. https://esterownik.pl/zdalny-dostep
    here you have graphical representation, how many degrees are on the sensor, and what are the settings. Only 100% do not suggest it because it's other boilers !!
  • Level 11  
    Thank you for the extensive material that gave me some hints. The outside temperature is the optimal process for achieving optimal results. In the examples given, this aspect has been omitted. In addition, the feeder's working time parameter is not understandable for me (eg 764 for 50s). In addition, does the temperature of the exhaust gas depend on the fuel level in the storage tank? I am waiting for further clarification.
  • Level 11  
    Hello everyone on my forum. Due to the lack of information I try different ways to reduce the temperature of the exhaust on the boiler flue. I managed to come down with temperature from 262 degrees to 212 degrees. Below this temperature the number of cycles of coal feeding increases which is a loss in its saving . I already have some experience what should be done to make the efficiency of the boiler right. After obtaining the temperature of 212 degrees, the range of coal feeding (cycles) from 12 to 7 was reduced in order to demand the desired temperature of the boiler.
  • Specialist - heating systems
    Pay attention to the cleanliness of the combustion chamber and the flue gas / water exchanger.
    The dirtier, the higher the temperature of the fumes - the less heat goes into the water.
    greetings
  • Level 40  
    Rządkowski Ryszard wrote:
    . My question: what should the temperature of the exhaust be?

    In general, the temperature of fumes in solid fuel boilers should be 150 to 200 degrees Celsius. This prevents the condensate from condensing from the flue gas, which can cause corrosion of the boiler and destruction of the chimney.
    In addition, the temperature of the exhaust depends on the current power and the boiler and the surface of the exchanger. As the exchanger in the boiler is too small, the flue gases will be hot.
    And as for the exhaust temperature itself, it is not worth lowering it too much at any price - as it may turn out that later losses to the burner can be bigger than the chimney loss. In addition, you still need to remember about the risk of condensation in the chimney ...
  • Level 11  
    The boiler with the exchanger is clean, free of soot, so it does not affect the temperature of the exhaust. To reduce the temperature of the exhaust gas I turned on the circulation pump every 3rd gear, as a result of which the temperature of the exhaust gases decreased by 40 degrees and I obtained less cycles of coal feeding from 12 to 7. Moreover, I did not notice any traces of condensate in the chimney. Soot in the cleaning is dry. From the information I obtained, I know that the temperature of the exhaust at the outlet of the chimney should be 40 degrees. I must therefore examine this information.
  • Level 1  
    Rządkowski Ryszard wrote:
    Hello everyone on my forum. Due to the lack of information I try different ways to reduce the temperature of the exhaust on the boiler flue. I managed to come down with temperature from 262 degrees to 212 degrees. Below this temperature the number of cycles of coal feeding increases which is a loss in its saving . I already have some experience what should be done to make the efficiency of the boiler right. After obtaining the temperature of 212 degrees, the range of coal feeding (cycles) from 12 to 7 was reduced in order to demand the desired temperature of the boiler.

    I do not know if you've heard about something like swirl swirlers, I think that if you use something like this then it should help
  • Level 8  
    During normal boiler operation in the vicinity of 75% of the maximum power, the temperature of the exhaust gases should not go below 90-100'C
    the majority of boilers, when working on 90% of the power, releases flue gases with temperatures above 150'C, I know huge heat loss :(