possible caused for stack temprature rising in boiler

The National Board of Boiler and Pressure Vessel Inspectors was created in 1919 to promote greater safety to life and property through uniformity in the construction, installation, repair, maintenance, and inspection of pressure equipment.

The "net stack temperature" is the difference between the flue gas inside the chimney and the room temperature outside the burner. Net stack temperatures above 700 o F (370 o C) are in general to high. Typical values are between 330 - 500 o F (160 - 260 o C). High stack temperatures may be caused by. undersized furnace; defective combustion chamber

Jan 18, 2012· With a thicker bed of coals my stack temperature goes down, quite a bit. Good gassification, better efficiency. Different types of wood effect that coal bed and therefor the stack temperature. How much the damper is open also has effects. Lots to learn. I also need a good stack temperature thermometer that measures on the inside of the pipe.

heat transfer. The stack temperature of a 4-pass boiler will be lower than the stack temperature of a 2 or 3-pass boiler, of the same basic design, operating under similar conditions. Because of this fact, the 4-pass will have higher efficiency and lower fuel cost. This is not an opinion; it is basic heat exchanger physics. The 4-pass design

Aug 29, 2017· The calculation of boiler’s fuel efficiency boiler should consider the consumption amount of fuel used, so it is very appropriate to be used as a point of boiler economic analysis. Direct Method There are two popular methods for calculating the fuel efficiency of …

What is the correct temp setting for a hot water boilerIncreasing stack temperature — Heating Help: The WallSee more results Nov 15, 2004· re: high flue gas temperature combustionman (Mechanical) 4 Nov 04 13:59 Four pass firetube boilers that utilize a refractory shelf for the chaning flue gas direction (like Cleaver Brooks boilers) can fail cuasing a short circuiting affect that will affect boiler output and increase stack temperature.

Dec 02, 2016· Shielding the boiler from indoor drafts and outdoor winds prevents the loss of heat caused by air flowing over the boiler surface. 4. Fuel Specification. As virtually anyone would expect, fuel specification can have a dramatic effect on your industrial boiler efficiency.

Jan 22, 2020· If you've got a condensing boiler, you may not be getting the full energy savings. Follow our guide to correctly set your water temp for the best efficiency.

BOILER STACK GAS HEAT RECOVERY IFinal), by P.C. Lu, T.T. Fu, S.C. Gargs and G. Nowakowski TN-1776 95 pp illus Sep 1987 Unclassified 1. Exhaust heat recovery Z, Stack heat I. R0371-804-431B This report is a detaillk study of various heat recovery schemes

May 28, 2013· If you set it too high, as is possible if you use the first method and put the heating on full with an idea to turning it off soon after, the risk is that the water which returns to the condensing boiler after having circulated through the radiators will be too high a temperature to recover enough heat from the boiler’s exhaust gases.

Author: P C Lu, T T Fu, S C Garg, G Nowakowski important to determine if the value is proven. For example, if a boiler runs on natural gas with a stack temperature of 350°F, the maximum theoretical efficiency of the unit is 83.5%. For the boiler to operate at 84% efficiency, the stack temperature must be less than 350°F.