THE METHODE TO IMPROVE EFFICIENCY OF BOILER

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boiler effiency

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THE METHEODS TO IMPROVE EFFICIENCY OF BOILER:

THE METHEODS TO IMPROVE EFFICIENCY OF BOILER PRESENTED TO Prof.dr/ OSAMA EL MASRY

BY:

BY HESHAM SAMIR AHMED NO: 570 WALID ATEF AHMED NO: 581 MOSTAFA RAMADAN KHALAF NO: 523 MOHAMED ADEL ABDELLATIF NO: 415 YASSER MAMDOUH NO: 586

Define of Boiler Efficiency :

Define of Boiler Efficiency Combustion Efficiency indication of the burner's ability to burn fuel. Thermal Efficiency It measures the ability of the exchanger to transfer heat from the combustion process to the water or steam in the boiler . It measures the ability of the exchanger to transfer heat from the combustion process to the water or steam in the boiler .

Fuel-To-Steam Efficiency:

Fuel-To-Steam Efficiency Fuel-to-steam efficiency is a measure of the overall efficiency of the boiler It accounts for the effectiveness of the heat exchanger as well as the radiation and convection losses . It is an indication of the true boiler efficiency

Ways to improve boiler efficient:

Ways to improve boiler efficient (1 ) Reducing excess air (adjusting A/F ratio ) (2) Reducing emissions (3) Switching to lower cost fuel (4) Installing deaerator mechanical- chemical (5) Installing economizer (6) Reducing scale and deposits

Ways to improve boiler efficient:

Ways to improve boiler efficient (7) Operating at peak efficiency more than boiler (8) Reducing blow down (9) Recovering waste heat from blow (10) Stopping dynamic operation (11) Switching from steam to air atomization (12) Reducing boiler pressure (13) Preheating combustion air

Reducing excess air (adjusting A/F ratio ):

Reducing excess air (adjusting A/F ratio ) By far the most common reason for energy inefficiencies in a boiler can be attributed to the use of excess air during combustion at the burners.

THANKS F`OR LISTENING TO US:

THANKS F`OR LISTENING TO US

Reducing excess air (adjusting A/F ratio ):

Reducing excess air (adjusting A/F ratio ) there are reasons for putting in some extra air for combustion -to compensate for imperfect burner fuel- air mixing conditions -compensate air density changes, -control system "slop", burner maintenance, -fuel composition and viscosity variation -imperfect atomizing steam or air controls for burners.

Adjusting the fuel-air ratio:

Adjusting the fuel-air ratio (A/F) ratio for combustion can be quite tricky. If the fuel is too much as compared to the air, incomplete combustion occurs. Therefore , many boiler operators choose to adjust their burners to be slightly on excess air

Reducing emissions:

Reducing emissions ALL components Emission Formed in boiler and its sources and bad effect for this emission

Installing deaerator:

Installing deaerator Deaerator (a) mechanical (b) chemical (1) To remove oxygen, carbon dioxide and other noncondensable gases from feed water

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(2) To heat the incoming makeup water and return condensate to an optimum temperature for: -Minimizing solubility of the undesirable gases -Providing the highest temperature water for injection to the boiler Deaerators are typically elevated in boiler rooms to help create head pressure on pumps located lower . This allows hotter water to be pumped without vapor locking should some steam get into the pump

(a) Mechanical deaerators :

(a) Mechanical deaerators Deaerators use low pressure steam to heat boiler make-up water and condensate return in order to (drive-off dissolved oxygen , CO2 and other corrosive gases) .

(b)Chemical Deaeration:

(b)Chemical Deaeration Complete oxygen removal cannot be attained by mechanical deaeration alone . Oxygen scavengers are added to the boiler water, preferably in the storage tank of the deaerator so the scavenger will have the maximum time to react with the residual oxygen.

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The most commonly used oxygen scavenger is sodium sulfite . It is ( a) inexpensive (b) very effective ) (c) rapidly reacts with the trace amounts of oxygen ). (d) It is also easily measured in boiler water .

Operating at Peak Efficiency :

Operating at Peak Efficiency When operating two or more boilers , improved efficiency can sometimes be obtained by unequal sharing of the load so that the combined load operates at peak efficiency

Reducing Scale and Deposits :

Reducing Scale and Deposits For any boiler operation, this is a must. The safety of the boiler is at stake. Any scale or deposits will lead to reduced heat transfer that will eventually ( a) Lead to overheating (b) reduction of mechanical strength of the steel (c) finally to bursting This should already be in the normal daily procedure of boiler operation.

Reducing Blow down :

Reducing Blow down Blow down of boiler water is discharging hot water into the drains. blow down is necessary to maintain the boiler water concentration of dissolved solids that are necessary for conditioning the boiler water. The challenge is to control the draining to the minimum

Recovering Waste Heat from Blow down :

Recovering Waste Heat from Blow down methods can be adopted to recover back some of the heat from the drained hot water Blow down tanks heat exchanger tubes and pumping arrangements can be fabricated to recover some of the heat back into the boiler

Switching from Steam to Air Atomization :

Switching from Steam to Air Atomization This is only applicable - For heavy fuel oil burners. - For burners with steam atomization switching to air atomization will naturally result in (a) less steam consumption overall (b) better boiler efficiencies.

Reducing boiler pressure:

Reducing boiler pressure By reducing the boiler pressure, Advantage: some of the heat losses through leakages or transmission may be reduced slightly . Disadvantage: .The boiler circulation may be upset and the steam lines may have insufficient capacity and flow to transport the low pressure steam

Preheating Combustion Air :

Preheating Combustion Air Any heat loss from the skin of the boiler to the boiler room can be utilized back for combustion By preheating the intake air the combustion in the furnace becomes more efficient .

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