 |
Invisible keywords: Sun Combustion, Combustion, Industrial, Industrial |
Combustion SUN COMBUSTION, INC. "INNOVATIVE COMBUSTION TECHNOLOGY"
|
|
|
|
|
SGC
SERIES™ GAS COOLING SYSTEM
Since 1988, Sun Combustion, Inc. has been
utilizing its unique liquid atomizing systems to provide innovative
solutions to a broad range of industrial problems. Today, the company designs
and manufactures systems for
combustion, environmental, humidification, paper moisturizing, food
processing, chemical coating, dust suppression and many other types of
applications. Sun Combustion, Inc. serves the
steel, non-ferrous metals, paper, textile, food, chemical, petro-chemical, mining, glass,
cement, rock products and a broad range of
other industries where hot gases
are formed in the production process. Sun Combustion, Inc. designs
and manufactures evaporative gas cooling systems
for the cooling and conditioning of hot gases prior to treatment by air pollution control equipment.
These evaporative gas cooling systems introduce a specific amount of
atomized liquids into hot gas streams
to reduce and control gas
temperatures so that pollution control equipment can effectively clean the gas stream. Sun Combustion, Inc. is devoted to resolving gas cooling and conditioning problems originating
with high temperature polluted gases. The company's design and application know-how is recognized around the
world in the form of hundreds of successfully
operating new and retrofit installations. In the majority
of retrofit applications, the special expertise of
Sun Combustion, Inc.’s engineers was required to correct deficiencies
or upgrade existing gas cooling equipment so
that these gas cooling systems could do the job they were designed to do. REQUIREMENTS OF A GAS COOLING SYSTEM From
its research and broad experience in a variety of gas cooling applications / installations,
Sun Combustion, Inc.’s engineers determined
that a reliable gas cooling system requires: A
Sound Understanding
of Droplet Evaporation Rates In developing its evaporative gas
cooling techniques, Sun Combustion, Inc.’s engineering staff made an initial
study of liquid
droplet evaporation rates to properly size cooling chambers.
The study analyzed various size liquid droplets with
inlet temperatures ranging from 150°F to 2500°F. Liquid droplets were then analyzed
at millisecond intervals until complete evaporation
was achieved. By including such new variables as heat transfer through
the steam barrier surrounding an evaporating
liquid droplet and the percent of water vapor in the
gas stream, meaningful new information was developed to permit the sizing of cooling sections based on the
residence time of various liquid droplets. Data from this study
was modified by comparisons with data from field
installations. A
Spray
System Capable of Producing Fine Liquid Droplets Any improvement in gas cooling performance must begin with better liquid atomization. The gas cooling system's liquid atomizing nozzles should have wide flow modulation characteristics and the capability of producing extremely fine liquid droplets at high flow rates; as inlet gas temperature decreases, a finer liquid droplet is required to maintain a dry outlet. They
should also operate at reasonable pressures
/ energy levels, be self-cleaning, maintenance free
and produce finer droplets as the nozzle's liquid flow rate is turned down. Sun Combustion, Inc.’s Liquid Atomizing Nozzles meet and
exceed these requirements.
A
Control System Capable
of Taking Advantage of the Spray System's Flow
Modulation Characteristics To
maximize the modulation capabilities of the Sun Combustion, Inc. liquid atomizing
nozzle, most Sun Combustion, Inc.’s evaporative gas cooling system
installations incorporate an automated, feed forward, cascade type control
system. The system is a two-loop scheme for sensing temperature at the inlet
and outlet of the gas cooling chamber. An inlet temperature controller
dictates the required water flow rate to the nozzles. The loop anticipates
changes in cooling system inlet temperature and corrects water flow at
approximately the same time the variation arrives at the spray nozzles. If there is any deviation
from set point at the cooler outlet, resulting from un-sensed
gas volume changes at the inlet, the outlet loop (set point) resets the set
point of the inlet loop. The downstream sensor provides a trimming feedback to
correct any system errors while providing fail-safe protection against excessive
temperatures at the bag house or electrostatic
precipitator collector. The system is designed to use only the proper volume of liquid required to
accomplish precise gas cooling. Wetted walls, refractory spalling,
sludge build-up, water carryover and recycling problems are avoided. Use of a feed
forward cascade system results in the control of set point
temperature to within ±5°F.
SGC SERIES™ GAS COOLING SYSTEM ADVANTAGES
|
|
|
