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what causes the high temperature of outside coal boiler flue gas

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Working Pressure: 0.7 - 2 Mpa

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Introduction of WNS gas / oil fired steam boiler:

WNS series horizontal internal combustion boiler is a boiler shell type 3 passes wetback oil/gas fired boiler. After fuel is being atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, this is 1st pass; the high temperature smoke is collected in reversal chamber and then enters 2nd pass which is grooved tubes bundle area; after heat convection, air temperature gradually falls and goes to front smoke box and turn to 3rd pass, which is smooth tubes bundle area, and then enters chimney passing back smoke box and exhausted to the atmosphere.

Technical advantages:

1. Digitized manufacture
The key part such as material cutting, rolling, drilling are proceeded by advanced CNC machining process to reduce the assemble stress and extend boiler working lifetime.
The front and back smoke chamber plates are cut by CNC plasma cutting machine and looks tidy and beautiful.

2.Easy operation and maintenance
Fully automatically operating, with automatically adjustment and protection of burning, water level, temperature and steam pressure.

3. Longer working life
Smoke tube and tube sheet connection is expanded first to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boilers working life.
Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint will have 100% radiographic inspection.
Fin tube us ND steel or stainless-steel material which avoid low temperature corrosion.
Inspection procedure point is set up to guarantee the sequence of expanding and welding, avoid cracking of the tube sheet holes.

4. Less fuel consumption
High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45℃ to control heat lost.
Sufficient steam storage room and heating area makes boiler to generate high quality steam and high thermal power.
Condenser is added to reuse the waste heat of the exhausted smoke to increase feeding water’s temperature and reduce emission temperature, which can increase the thermal efficiency above 98% and save operating cost.

Understanding Boiler Flue Gas Analys

Author: Noria Corporation Combustion Efficiency and Excess Air - Engineering . 2019-11-15 · Example - Oil Combustion and Heat Loss in the Flue Gas. If. the temperature difference between the flue gas leaving a boiler and the ambient supply temperature is 300 o C, and; the carbon dioxide measured in the flue gas is 10% - then, from the diagram above. the flue gas loss can be estimated to approximately 16%.

What effect will blocked flue have on the boiler - Answe

These gases are one of causes of heat loss in combustion process. The high temperature of flue gas coming out from boiler affect amount of heat loss.

Combustion Efficiency and Excess Air - Engineering ToolB

The relation between temperature difference in flue gas and supply air, the CO 2 concentration in the flue gas, and the efficiency loss in the flue gas oil combustion, is expressed below: Example - Oil Combustion and Heat Loss in the Flue Gas. If. the temperature difference between the flue gas leaving a boiler and the ambient supply temperature is 300 o C, and

HIGH FLUE GAS TEMPERATURE - Boiler and Pressure Vess

Nov 15, 2004· Can anybody help me on this. Our firetube boiler has a progressive increase in flue gas temperature due to the formation of unburned residue or soot inside the boiler. We have already check the flue gas analysis and its corresponds to the standard setting. CO2 = 12-15%, O2 = 3-5%. Any suggestions regarding this.

5 Factors Killing Your Industrial Boiler Efficiency & What

Excess Air Effect on Industrial Boiler Efficiency. All combustion burners require some degree of …

What is the gas temperature coming out from the hi

What type of fuel are you burning - oil or natural gas?you'll not get much soot from NG, but whatever you are burning is fouling the tubes if the flue temperature increases and the steaming rate is declBlow the soot and descale the shell(or outer side of the tubes) Proper combustion is not an indicator for good heat transfer across the tubes.Are you certain that the watersides are clean? Increasing stack temperature is one of the indicators of scaling in the boiler. Since your stack gFour pass firetube boilers that utilize a refractory shelf for the chaning flue gas direction (like Cleaver Brooks boilers) can fail cuasing a shorYou share a couple of causes for this problem. But just think about this. I am using CB600 boiler. From the info I recieve CB600 boilers only firesWhen you use lighter oils with same fuel pump and nozzle, more fuel flows into the boiler. There are fair chances for unburned fuel accumulating ingladkenn, The mixture with 70% Diesel fuel has lower viscosity, and the nozzle(s) are probably not atomizing as effectively. You could check nozzlAs a commissioned boiler inspector, I suggest the following: -Consider employing a qualified specialist to evaluate your boiler combustion controls1I can not believe that the flue gas temperature is increasing thru each pass of the firetube boiler.If soot is building up inside the firetubes, puCombustion high CO - Boiler and Pressure VesselAug 30, 2005High flue gas temperatureMay 13, 2003See more results Excess Air Effect on Industrial Boiler Efficiency. All combustion burners require some degree of … The flue gas temperature should always be maintained preferably within 120 to 150 deg Celsius. If it goes beyond 150 deg Celsius then the flue gas exit loss …

Finding the Root Cause of Boiler Tube Failur

Causes : Long-term operation at relatively high metal temperatures can result in damage in carbon steels of higher carbon content, or carbon-molybdenum steel, particularly in weld heat affected zones (HAZ), and result in a unique degradation of the material.

Flue Gas - an overview | ScienceDirect Topi

The flue gas exits the cyclones to a plenum chamber in the top of the regenerator. The hot flue gas holds an appreciable amount of energy. Various heat recovery schemes are used to recover this energy. In some units, the flue gas is sent to a CO boiler where both the sensible and combustible heat is used to generate high-pressure steam.

Flue Gas Analysis Table | CleanBoiler.o

Operation. Using a Flue Gas Analyzer or any meter designed to measure oxygen or carbon-monoxide, and taking the flue gas temperature and the temperature of the combustion air, the following Table can be used to determine combustion efficiency when operating on natural gas. The Temperature Column is the NET Difference between Flue Gas and Combustion Air Temperatures.

Boilers High Furnace Pressure - Specific causes - Brig

As furnace pressure increase is one of the indications for boiler explosion boiler operating engineers and all concerned must view increase in furnace pressure very critical and take corrective action and ensure safety. High furnace pressure is a direct indication of disturbance in combustion performance. The rate of change in the furnace pressure can vary very much, that is from a simple

Unit 13 - Combustion Flashcards | Quizl

If, during a flue gas analysis, the excess air to a boiler furnace is increased: D) CO2 percentage should decrease. In AFBC, the fuel content by mass of the turbulent material is usually less than:

Low Temperature Corrosion in Boiler and Its Preventi

The presence of moisture in the flue gas due to moisture in fuel and air, sulphur dioxide, and trioxide, combines with moisture and forms sulphuric acid and sulphuric acid. These acids condense from around 115 degree centigrade to slightly higher than 160 degrees, depending upon the …

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