Presentation is loading. Please wait.

Presentation is loading. Please wait.

ACTIVE LEARNING PROCESS Prepared By : BINI MOL THOMAS 13BEECG069 VISHAL SALVI 13BEECG067 HARSHAL M.H 13BEECG064 Guided By : Prof. C O Yadav Branch: Electronics.

Similar presentations


Presentation on theme: "ACTIVE LEARNING PROCESS Prepared By : BINI MOL THOMAS 13BEECG069 VISHAL SALVI 13BEECG067 HARSHAL M.H 13BEECG064 Guided By : Prof. C O Yadav Branch: Electronics."— Presentation transcript:

1 ACTIVE LEARNING PROCESS Prepared By : BINI MOL THOMAS 13BEECG069 VISHAL SALVI 13BEECG067 HARSHAL M.H 13BEECG064 Guided By : Prof. C O Yadav Branch: Electronics & Communication

2 2

3 3 1. Describe the theory, construction, and applications of boilers 2. Describe the common type of boilers 3. Explain how to assess the performance and efficiency of a boiler 4. Describe methods to improve boiler efficiency 5.List energy efficiency opportunities Objectives

4 4 Introduction – Purpose? Type of boilers Boiler Assessment Energy efficiency opportunities Objectives

5 5 What is a Boiler? Introduction Vessel that heats water to become hot water or steam At atmospheric pressure water volume increases 1,600 times Hot water or steam used to transfer heat to a process

6 6 Thermal Equipment/ Boilers Introduction BURNER WATER SOURCE BRINE SOFTENERS CHEMICAL FEED FUEL BLOW DOWN SEPARATOR VENT VENT EXHAUST GAS STEAM TO PROCESS STACK DEAERATOR PUMPS Figure: Schematic overview of a boiler room BOILER ECO- NOMI- ZER

7 7 Thermal Equipment/ Boilers Types of Boilers 1.Fire Tube Boiler 2.Water Tube Boiler 3.Packaged Boiler 4.Fluidized Bed (FBC) Boiler 5.Stoker Fired Boiler 6.Pulverized Fuel Boiler 7.Waste Heat Boiler What Type of Boilers Are There?

8 8 Thermal Equipment/ Boilers Type of Boilers (Light Rail Transit Association) 1. Fire Tube Boiler Relatively small steam capacities (12,000 kg/hour) Low to medium steam pressures (18 kg/cm2) Operates with oil, gas or solid fuels

9 9

10 10

11 11 Thermal Equipment/ Boilers Type of Boilers 2. Water Tube Boiler (Your Dictionary.com) Used for high steam demand and pressure requirements Capacity range of 4,500 – 120,000 kg/hour Combustion efficiency enhanced by induced draft provisions Lower tolerance for water quality and needs water treatment plant

12 12 Thermal Equipment/ Boilers Type of Boilers (BIB Cochran, 2003) 3. Packaged Boiler Oil Burner To Chimney Comes in complete package Features High heat transfer Faster evaporation Good convective heat transfer Good combustion efficiency High thermal efficiency Classified based on number of passes

13 13 Thermal Equipment/ Boilers Type of Boilers 4. Fluidized Bed Combustion (FBC) Boiler Particles (e.g. sand) are suspended in high velocity air stream: bubbling fluidized bed Combustion at 840° – 950° C Fuels: coal, washery rejects, rice husk, bagasse and agricultural wastes Benefits: compactness, fuel flexibility, higher combustion efficiency, reduced SOx & NOx

14 14 Thermal Equipment/ Boilers Type of Boilers 5. Stoke Fired Boilers a) Spreader stokers Coal is first burnt in suspension then in coal bed Flexibility to meet load fluctuations Favored in many industrial applications

15 15 Thermal Equipment/ Boilers Type of Boilers 5. Stoke Fired Boilers b) Chain-grate or traveling-grate stoker (University of Missouri, 2004) Coal is burnt on moving steel grate Coal gate controls coal feeding rate Uniform coal size for complete combustion

16 16 Thermal Equipment/ Boilers Type of Boilers Tangential firing 6. Pulverized Fuel Boiler Pulverized coal powder blown with combustion air into boiler through burner nozzles Combustion temperature at °C Benefits: varying coal quality coal, quick response to load changes and high pre- heat air temperatures

17 17 Independence Steam Electric Station - Newark, AR Operation: Unit 1 - January 1983/Unit 2 - December 1984 Fuel: Low-sulfur coal mined near Gillette, Wyoming Capability: 1,678 megawatts

18 18 Thermal Equipment/ Boilers Type of Boilers Agriculture and Agri-Food Canada, Waste Heat Boiler Used when waste heat available at medium/high temp Auxiliary fuel burners used if steam demand is more than the waste heat can generate Used in heat recovery from exhaust gases from gas turbines and diesel engines

19 19 Thermal Equipment/ Boilers Assessment of a Boiler 1. Boiler performance Causes of poor boiler performance -Poor combustion -Heat transfer surface fouling -Poor operation and maintenance -Deteriorating fuel and water quality Heat balance: identify heat losses Boiler efficiency: determine deviation from best efficiency

20 20 Thermal Equipment/ Boilers Assessment of a Boiler Heat Balance An energy flow diagram describes geographically how energy is transformed from fuel into useful energy, heat and losses Stochiometric Excess Air Un burnt FUEL INPUT STEAM OUTPUT Stack Gas Ash and Un-burnt parts of Fuel in Ash Blow Down Convection & Radiation

21 Thermal Equipment/ Boilers Assessment of a Boiler Heat Balance Balancing total energy entering a boiler against the energy that leaves the boiler in different forms Heat in Steam BOILER Heat loss due to dry flue gas Heat loss due to steam in fuel gas Heat loss due to moisture in fuel Heat loss due to unburnts in residue Heat loss due to moisture in air Heat loss due to radiation & other unaccounted loss 12.7 % 8.1 % 1.7 % 0.3 % 2.4 % 1.0 % 73.8 % % Fuel 73.8 %

22 22 Thermal Equipment/ Boilers Assessment of a Boiler Heat Balance Goal: improve energy efficiency by reducing avoidable losses Avoidable losses include: -Stack gas losses (excess air, stack gas temperature) -Losses by unburnt fuel -Blow down losses -Condensate losses -Convection and radiation

23 23 Thermal Equipment/ Boilers Assessment of a Boiler 1. Boiler Efficiency Thermal efficiency: % of (heat) energy input that is effectively useful in the generated steam

24 24 Thermal Equipment/ Boilers Assessment of a Boiler Boiler Efficiency: Direct Method Boiler efficiency ( ) = h f /h g Heat Input * 100% Heat Output

25 25


Download ppt "ACTIVE LEARNING PROCESS Prepared By : BINI MOL THOMAS 13BEECG069 VISHAL SALVI 13BEECG067 HARSHAL M.H 13BEECG064 Guided By : Prof. C O Yadav Branch: Electronics."

Similar presentations


Ads by Google