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why temperature boiler exhaust gases should be maintained above a minimum value

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    • low temperature corrosion in boiler and its prevention

      Low Temperature Corrosion in Boiler and Its Prevention

      Condensation of these acids results in metal wastage and boiler tube failure, air preheater corrosion, and flue gas duct corrosion. In order to avoid or reduce the cold end corrosion the gas temperature leaving the heat transfer surface in boiler is kept around 150 degrees centigrade, ranging from 120 to 155.

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    • exhaust gas boilers and economisers working procedure

      Exhaust Gas Boilers And Economisers working procedure

      On vessels with an exhaust economiser by pass valve, water temperature is a critical factor in preventing condensation and acid formation on the gas side. The minimum temperature of 140 degree C should be kept, when running with the exhaust gas bypassing the economiser. iii) Operation 1) Exhaust gas boiler circulation must be maintained at all times. This is to maintain tube temperature and prevent “cold …

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    • boiler efficiency and combustion | spirax sarco

      Boiler Efficiency and Combustion | Spirax Sarco

      Heat losses in the flue gases. This is probably the biggest single source of heat loss, and the Engineering Manager can reduce much of the loss. The losses are attributable to the temperature of the gases leaving the furnace. Clearly, the hotter the gases in the stack, the less efficient the boiler.

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    • technical advice on boiler combustion control

      Technical advice on boiler combustion control

      Typically, the dominant loss is associated with energy leaving the boiler with combustion gases. The temperature of exhaust gases is an indication of their energy content. Ensuring that the heat-transfer surfaces of the boiler are clean is a major point of focus for managing the thermal energy in exhaust gases.

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    • protecting boilers against flue gas condensation | 08

      Protecting Boilers Against Flue Gas Condensation | 08

      • boiler combustion | cleanboiler.org

        Boiler Combustion | CleanBoiler.org

        Selective non-catalytic reduction involves the injection of a NOx reducing agent, such as ammonia or urea, into the boiler exhaust gases at a temperature of approximately 1400-1600°F. The ammonia or urea breaks down the NOx in the exhaust gases into water and atmospheric nitrogen. Selective non-catalytic reduction reduces NOx up to 70%.

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      • gas-fired boilers - code compliance brief | building

        Gas-Fired Boilers - Code Compliance Brief | Building

        M2103.2.1, Slab-on-grade. Radiant piping used in slab-on-grade applications should be insulated to a minimum R-value of 5 installed beneath the slab. M2103.2.2, Suspended floor. Suspended floor applications, insulation should be installed in the joist bay cavity serving the heating space above and should be insulated to a minimum R-value of 11.

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      • exhaust gas - an overview | sciencedirect topics

        Exhaust Gas - an overview | ScienceDirect Topics

        High loads and high speeds result in the highest temperatures. Generally, temperatures of 500–700°C (932–1293°F) are produced in the exhaust gases from diesel-cycle engines at 100% load to 200–300°C (392–572°F) with no load. Exhaust gases normally discharges at a temperature of around 420°C (788°F).

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      • unit 81 boiler and related equipment flashcards | quizlet

        Unit 81 Boiler and Related Equipment Flashcards | Quizlet

        What is the minimum desired return water temperature for a gas fired boiler? Why is it desirable to have a minimum water temperature entering the boiler? To prevent condensation in the flue. The system is under enough pressure to raise the boiling point above the water temperature in the boiler.

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      • myths and methods for protecting boilers against flue gas

        Myths and methods for protecting boilers against flue gas

        Nov 27, 2017 · The operating logic within this controller gives priority to maintaining the boiler inlet temperature above a user-selected minimum value, which, in the example in Figure 4, is 130°. The system in Figure 4 uses a mixing valve controller that measures boiler inlet temperature. Notice that the water temperature entering the boiler is now 130°.

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      • fuels exhaust temperatures - engineering toolbox

        Fuels Exhaust Temperatures - Engineering ToolBox

        Exhaust Temperature (o F) (o C) Chemical Oxidation: 1350 - 1475: 730 - 800: Annealing furnace: 1100 - 1200: 590 - 650: Fluidized-bed combustion: 1600 - 1800: 870 - 980: Natural-gas fired heating appliance with draft hood: 360: 182: Liquefied-petroleum gas-fired heating appliance with draft hood: 360: 182: Gas-fired heating appliance, no draft

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      • understanding boiler stack losses - forbes marshall

        Understanding Boiler Stack Losses - Forbes Marshall

        Depending upon the type of fuel which is being used and burner type, standard percentage of allowable excess should be found out and these values should be followed strictly. Controlling outlet temperature of flue gases. A common trend observed is, as boiler is operated continuously, the measured outlet temperature of flue gases increases.

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      • managing condensate for condensing boilers

        Managing Condensate for Condensing Boilers

        Flue gas starts to condense when it drops below its dew point of 55°C. This is why condensing boilers are designed to accommodate a return water temperature of 54°C or less. It is this resulting condensate liquid that is acidic and requires treatment to avoid damage to piping systems, sewerage systems and other items it may come in contact with.

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      • exhaust gas boiler on ships - marine engineering

        Exhaust Gas Boiler on Ships - Marine Engineering

        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.

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      • heat recovery from boiler exhaust gases | physics forums

        Heat Recovery from Boiler Exhaust Gases | Physics Forums

        Jan 05, 2015 · The exhaust gases from a natural gas-fired central heating boiler leave the boiler at a temperature of 70 deg C. The oxygen content of the exhaust gases is 9% by volume (dry). The rate of energy input (Gross calorific value) to the boiler from natural gas is 16kW. The gross calorific value of natural gas is 55MJ/kg.

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      • boiler exam study guide 1 flashcards | quizlet

        boiler exam study guide 1 Flashcards | Quizlet

        A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in ___. heating surface The part of a boiler that has the heat and gases of combustion on one side and water on the other side is known as the ___.

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