Tubular Type Recuperative Air Preheater Pre Heating For Thermal Power Plant

Tubular Type Recuperative Air Preheater Pre Heating For Thermal Power Plant

Introduction

An air preheater (APH) is a general term to describe any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process. They may be used alone or to replace a recuperative heat system or to replace a steam coil.
In particular, this article describes the combustion air preheaters used in large boilers found in thermal power stations producing electric power from e.g. fossil fuels, biomasses or waste.

Purpose of Preheaters

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas. As a consequence, the flue gases are also conveyed to the flue gas stack (or chimney) at a lower temperature, allowing simplified design of the conveyance system and the flue gas stack. It also allows control over the temperature of gases leaving the stack (to meet emissions regulations, for example).

Specifications

Advantages of Using Air Heater

The recovery of waste heat from the flue gas and heating the air required for Boiler In an air heater gives the following advantages.
a) The Boiler efficiency is increased.
b) More stable combustion in furnace.
c) The combustion is intensified with the use of hot air.
d) Lower grades of coals can be burnt efficiently with hot-air.
e) The use of hot air, improves the heat transfer rate and so less heat transfer area will be required.
f) The combustion is made complete with negligible amount of carbon in ash.
g) Faster load variations are possible.
h) The coal can be dried effectively for easy pulverization and combustion.

Quality Control

1. Fabrication area of 200,000 square meters

2. 150 Engineers

3. 400 Coded welders

4. 60 Licensed Inspectors(NDT Level-III instructors)

5. Class-A Licenses for Design and Manufacture Boiler

6. ISO 9001:2008 Quality System

7. ASME Certificate of Power Boilers

8. ASME 'S','U' and NB stamp authorization

Company Introduction

Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading as HD Boiler),produces power plant; industrial; waste heat; waste incineration; biomass; organic heat carrier and electric steam boilers. Coupled with a comprehensive range of heating surfaces, HD Boiler brings to the market a unique service including boiler design , fabrication, installation, maintenance and replacement of boiler pressure parts.