The main difference is that condensing boilers are up to 99% efficient while non-condensing boiler are only up to 78% efficient. This means that condensing boilers help you save up to £310 per year on gas bills while also reducing your household emissions. If you want to replace your old boilers and you are looking into upgrading to a

Thus, the exhaust temperature has to be maintained above this temperature to avoid large-scale corrosion of boiler water tubes. This limits the boiler energy extraction efficiency and constitutes the largest heat loss from the boiler. Coal in CFB boiler is mixed with sand and limestone/dolomite (to absorb SOx pollutant gases).

Jun 08, 2016· Usually there are two types of boilers on a ship,Auxiliary boiler and Exhaust boiler. Sometimes there are composite boilers, standard cargo ships have water tube boilers. The auxiliary boiler on a ship is the one which operates on diesel/furnace o

6 Soot Deposits and Fires in Exhaust gas Boilers quality and the above highly efficient and perhaps “overstretched” design, it also seemed that the tendency to fouling, i.e. soot deposits on the ex haust gas boiler tubes, had increased and, in some cases, had resulted in soot fires. In extreme cases, the soot

Composite boiler. A firetube boiler which can generate steam by oil firing or the use of diesel engine exhaust gas.

Exhaust Gas Boilers And Economisers Arrangement Auxiliary boilers on diesel main propulsion ships, other than tankers, are usually of composite form, enabling steam generation using oil firing or the exhaust gases from the diesel engine. With this arrangement the boiler acts as the heat exchanger and raises steam in its own drum.

Composit Cochran boiler- Composite boilers are mostly sued on ships because when a ship is in port, the firing is through the burner. But when a ship is en route, then main engine exhaust is used to heat the water in order to generate the required steam.

Exhaust Gas Boilers The Clayton Heat recovery boiler operates on the same tried and tested principle as the world famous Clayton Steam generator. It is therefore the most compact, efficient, responsive and safest means of producing high quality steam or hot water from waste gas streams.

Difference Between Heat Exchange Equipments - posted in Student: hii. I am interested to know the difference between reboiler & boiler , vaporizer & reboiler or boiler , evaporator & vaporizer (because in an evaporator we also vaporize water and concentrate the soluton)..I have read the differences from "Process Heat Transfer BY KERN D.Q" but I want to know more logical difference between

Dec 13, 2007· The difference is very simple a normal combination boiler (one which heats hot water as well as central heating) burns gas or oil in a combustion chamber and uses that to heat water in a heat exchanger within the boiler. the difference is that the condensing boiler uses the hot flue (exhuast) gases from that burning to pre-heat the water coming into the boiler in another smaller heat exchanger.

Composite boilers are combination of oil-fired boilers and exhaust gas economizers.When the diesel engine is at full load the fuel oil burner only starts if the steam demand exceeds the steam production achieved from the diesel engines exhaust gases.

Jun 08, 2019· A composite boiler is a specially designed boiler that can use more that one means to pass hot flue gases from different sources to generate steam. For example a boiler that can be fired directly using its in-built furnace and other means to pass

Jan 14, 2013· A combi boiler produces the hot water for washing etc directly from the boiler so if you turn a hot tap on the boiler kicks in and heats the water as you use it, a conventional boiler heats the water in a storage cylinder by means of a heat exchanger and hot water for washing etc is …

May 21, 2009· A boiler is a unit that is used to create a boiling liquid and perhaps a vapour as in a (re)boiler on the bottom of a distillation column.As the boiling of a liquid will nearly always generate vapour you could always assume two phases (liquid and gas) are present io a boiler.

Some people are often confused on the difference between a combi and heat boiler. This is mainly because people believe that all boilers are the same, as in they serve the same function of heating water. There are certain key differences between the combi and heat-only boiler. We explain below the main differences between the combi and heat

Dec 09, 2015· In emergency mode the exhaust gas boiler can therefore be operated with low water level and even without water with the full exhaust gas flow through the boiler tubes, provided the boiler is operated depressurised and the inside temperature does not exceed 400˚C. For inside inspection, the boiler is arranged with both hand holes and manholes.

Composite boilers are often used in conjunction with Diesel machinery, since if the exhaust gas from the engine is low in temperature due to slow running of the engine and reduced power output; the pressure of the steam can be maintained by means of an oil fired furnace.

The higher pressure would be advantageous if the boiler is oil-fired, but the difference is hardly measurable. If you have a diesel engine exhaust gas economizer then 7 bar boiler pressure would gain more heat from the exhaust gases. Boiler Questions and Answers