International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
PERFORMANCE ANALYSIS AND OPTIMIZATION OF AIR PREHEATER IN THERMAL POWER PLANT Bihari Lal Meena1, Mohd. Yunus Sheikh2 1M.TechScholer, 2Assistantant
Dept. of Mechanical Engineering, Govt. Engineering College Bikaner, Rajasthan, India
professor, Dept. of Mechanical Engineering, Govt. Engineering College Bikaner, Rajasthan, India
---------------------------------------------------------------------***--------------------------------------------------------------------2. WORKING PRINCIPLE Abstract - This paper presents working of air preheter with performance analysis and optimization. The regenerative air preheater absorbs waste heat from flue gas. Absorb this heat transfers to cold air by means of continuously rotating heat transfer element of specially formed metal sheets. Bi-sector Air preheater preheats the combustion air and primary air that is required to preheat & carry pulverized fuel to the burners. Trisector air preheater preheats secondary air for use combustion. A performance evaluation and optimization of an air preheater based on routine operation data measured onsite at Chhabra Thermal Power Project, Chhabra. The performance was evaluated before and after radial sector plate and Axial Seal Plate clearance adjustment and improvement seen along with air preheater optimization.
As the name implies the tri-sector air pre heater design three sections one used of flue gas, second as primary air used for drying and transport of coal mill to furnace and third as secondary air used for combustion. Air preheater wastage of heat recovers and used increase thermal efficiency of boiler. The rotor slowly revolve element alternatively through the air and gas passage, heat absorbed by element surfaces passing through the flue gas side. These same surfaces carried through the air side. They released the stored up heat increase the temperature of the incoming combustion air. The ljungstrom air pre-heater is more widely used than other type heat exchanger. The regions for performance and reliability, effective leakage control and any fuel burning process. Simplicity of design makes it easy and economical to maintain operation and schedule outage. [2]
Key Words: Air preheater, air leakage, gas side efficiency, seals and x-ratio.
3. HEATING ELEMENTS
1. INTRODUCTION
The heating element is a compact arrangement of formed metal sheets contained in the rotor in two and more layer. The basket element at the cold end air admitted and flue
Modern high capacity boilers are essential air pre heater. Air preheater is an important auxiliary of boiler which used improve the efficiency. Air preheater primarily preheat combustion air for smooth operation the furnace as last system of boiler heat recovers. If the incoming air for combustion is not preheat then more fuel consume which increase overall cost increase and decrease plant efficiency. There are many factors depend on air preheater performance like as high seal leakage, basket element fouling and plugging. [1] These high efficiency elements are spaced and compactly arranged with in twelve shaped compartments for heater size from 24.5 to 36 inches of a radically divided cylindrical shell called the rotor. The housing surrounding the rotor provided with duct connections at both ends. Seals are both end radial, axial and circumference for restriction air leakage. The air pre heater size 27.5 VIMT 2000, total weight 295000 kg, weight of one module assembly 17200 kg, Hot end basket weight 700 kg and cold end basket weight 320 kg.[7]
Š 2017, IRJET
|
Impact Factor value: 5.181
Fig-1: (a) Air Preheater (b) Heating Element(c) Basket [5]
|
ISO 9001:2008 Certified Journal
|
Page 1767