Eclipse Combustion RatioMatic RM Series Guide

Eclipse RatioMatic Burners
RM Series Version 3.00
No. 110, 4/98
L00002
DesignGuide

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
Copyright I998 by Eclipse Combustion, Inc. All rights
reserved worldwide. This publication is protected by federal
regulation and shall not be copied, distributed, transmitted,
transcribed or translated into any human or computer
language, in any form or by any means, to any third parties,
without the express written consent of Eclipse
Combustion, Inc., Rockford, Illinois, U.S.A.
We reserve the right to change the construction and/or
configuration of our products at any time without being
obliged to adjust earlier supplies accordingly.
The material in this manual is believed adequate for the
intended use of the product. If the product, or its individual
modules or procedures, are used for purposes other than
those specified herein, confirmation of their validity and
suitability must be obtained. Eclipse Combustion, Inc.
warrants that the material itself does not infringe any United
States patents. No further warranty is expressed or implied.
We have made every effort to make this manual as accurate
and complete as possible. Should you find errors or
omissions, please bring them to our attention so that we
may correct them. In this way we hope to improve our
product documentation for the benefit of our customers.
Please send your corrections and comments to our
Documentation Manager.
It must be understood that Eclipse Combustion’s liability for its
products,whether due to breach of warranty, negligence, strict
liability,or otherwise, is limited to the furnishing of such
replacement parts and Eclipse Combustion will not be liable for
any other injury, loss, damage or expenses, whether direct or
consequential, including but not limited to loss of use, income
of or damage to material arising in connection with the sale,
installation, use of, inability to use or the repair or replacement
of Eclipse Combustion’s products.
Any operation expressly prohibited in this Guide, any
adjustment, or assembly procedures not recommended or
authorized in these instructions shall void the warranty.
COPYRIGHT
DISCLAIMER NOTICE
LIABILITY AND
WARRANTY
ii

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
About this manual
AUDIENCE
iii
This manual has been written for people who are already
familiar with all aspects of a nozzle-mix burner and its add-on
components, also referred to as “the burner system.”
These aspects are:
•design/selection
•use
•maintenance.
The audience is expected to have had experience with this kind
of equipment.
Design Guide No.110
• This document
RatioMatic Data Sheets, Series 110
• Available for individual RM models
•Required to complete design & selection
Installation Guide No.110
Used with Data Sheet to complete installation
RatioMatic Price List No.110
Used to order burners
•EFE 825 (Combustion Engineering Guide)
•Eclipse Bulletins and Info Guides: 710, 732, 742, 760, 818,
832, 852, 854, 856, 610, 620, 630, 826, 820, 930, I-354.
Purpose
The purpose of this manual is to ensure that the design of a
safe, effective, and trouble-free combustion system is carried
out.
RATIOMATIC
DOCUMENTS
RELATED DOCUMENTS

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
iv
There are several special symbols in this document. You must
know their meaning and importance.
The explanation of these symbols follows below. Please read it
thoroughly.
Danger:
Indicates hazards or unsafe practices which
WILL result in severe personal injury or even
death. Only qualified and well trained personnel
are allowed to carry out these instructions or
procedures.
Act with great care and follow the instructions.
Warning:
Indicates hazards or unsafe pratices which could
result in severe personal injury or damage.
Act with great care and follow the instructions.
Caution:
Indicates hazards or unsafe practices which could result in
damage to the machine or minor personal injury, Act
carefully.
Note:
Indicates an important part of the text. Read thoroughly.
If you need help, contact your local Eclipse Combustion
representative.You can also contact Eclipse Combustion at any
of the addresses listed on the back of this document.
DOCUMENT
CONVENTIONS
HOW TO GET HELP

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
Table of Contents
1
v
About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
RatioMatic Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
How to Get Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Operator Training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Step 1: Burner Option Selection . . . . . . . . . . . . . . . . . . . . 3-2
Step 2: Blower Option Selection . . . . . . . . . . . . . . . . . . . . 3-4
Step 3: Control Methodology . . . . . . . . . . . . . . . . . . . . . . 3-5
Step 4: Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Step 5: Flame Monitoring Control System . . . . . . . . . . . . 3-8
Step 6: Main Gas Shut-Off Valve Train . . . . . . . . . . . . . . . . 3-9
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Key to System Schematics . . . . . . . . . . . . . . . . . . . . . . . . . A-2
2
3

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
1-1
Introduction
The RatioMatic Version 3.00 is a nozzle-mix type burner
designed for direct air heating, indirect air heating, and oven
applications up to 1800° F. (1000° C.)
The burner package includes a combustion air blower and an
air:gas ratio regulator to fire over a wide gas turndown range at
a controlled ratio.
The burner is designed for:
•efficient ratio controlled combustion
•reliable burner operation
•simple burner adjustment
•direct spark ignition
•multiple fuel capability
A wide variety of options and configurations are available due
to the modular design of the burner.
The RatioMatic Burner
PRODUCT DESCRIPTION
11
11
1

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98 2-1
INTRODUCTION This section is provided as a guide for the safe operation of
the RatioMatic burner system. All involved personnel should
read this section carefully before operating this system.
Danger:
The RatioMatic burners, described herein, are
designed to mix fuel with air and burn the
resulting mixture. All fuel burning devices are
capable of producing fires and explosions if
improperly applied, installed, adjusted,
controlled, or maintained.
Do not bypass any safety feature; fire or
explosion could result.
Never try to light a burner if it shows signs of
damage or malfunction.
Warning:
The burner might have HOT surfaces. Always
wear protective clothing when approaching the
burner.
Note:
This manual provides information in the use of these
burners for their specific design purpose. Do not deviate
from any instructions or application limits described herein
without written advice from Eclipse Combustion.
Read the entire manual before attempting to start this
system. If you do not understand any part of the
information contained in this manual, contact your local
Eclipse representative or Eclipse Combustion before
continuing.
SAFETY
Safety 22
22
2

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
Only qualified personnel, with good mechanical aptitude and
experience on combustion equipment, should adjust, maintain,
or troubleshoot any mechanical or electrical part of this
system.
The best safety precaution is an alert and trained operator.
Train new operators thoroughly and have them demonstrate
an adequate understanding of the equipment and its operation.
A regular retraining schedule should be administered to
ensure operators maintain a high degree of proficiency.
Order replacement parts from Eclipse Combustion only. All
Eclipse Combustion approved, customer supplied valves or
switches should carry UL, FM, CSA,CGA,and/or CE approval,
where applicable.
CAPABILITIES
OPERATOR TRAINING
REPLACEMENT PARTS
2-2

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98 3-1
System Design
DESIGN Design structure
The design process is divided into the following steps:
1. Burner Option Selection including:
•Burner Model / Size Selection
•Fuel Type
•Air Supply
•Combustor Type
•Combustor Length
•Control Motor
•Burner Configuration
•Gas Pipe Connection
•Flame Supervision
•Air Flow Switch
2. Blower Option Selection including:
•Power Supply Frequency
•Pressure & Flow
•Blower Motor Type
•Blower Inlet
•Motor Orientation
3. Control Methodology including:
•Burner Control
4. Ignition System including:
•Ignition Transformer
•Trial For Ignition
•Ignition Gas Piping
5. Flame Monitoring Control System including:
•Flame Sensor
•Flame Monitoring Control
6. Main Gas Shut-Off Valve Train including:
•Component Selection
•Valve Train Size
33
33
3

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
3-2
Step 1 describes how to select burner options to suit an
application. Use the RatioMatic Price List 110 and Data Sheets,
Series 110 when following this selection process.
Caution:
Consult EFE-825,Eclipse Combustion Engineering Guide,or
contact Eclipse Combustion if you have special conditions or
questions.
Burner Model / Size Selection
Consider the following when selecting the burner size:
•Heat Input. Calculate the required heat input to
achieve the required heat balance.
•Power Supply Frequency. Burner capacity will vary
with power supply frequency (50Hz or 60Hz power).
•Combustion Chamber Pressure.Consider the
effects that large or varying chamber pressures have on
burner performance.
•Altitude. The maximum burner capacity is reduced by
approximately 3% each 1000 feet (300 meters) above
sea level.
•CombustionAir Supply. Combustion air should be
fresh (20.9% O2) and clean (without corrosives).
•CombustionAirTemperature. Changes in air supply
temperature can affect the burner capacity. The
combustion air supply temperature should not exceed
250° F.
•FuelType.Variation in calorific value and density will
affect burner performance.
Fuel Type
Fuel Symbol Gross HeatingValue Specific Gravity
Natural gas CH490%+ 1000 BTU/ft30.60
1.52
1.95
(40 MJ/m3)
(103 MJ/m3)
(130 MJ/m3)
Propane C3H82570 BTU/ft3
Butane C4H10 3250 BTU/ft3
BTU/ft3@ standard conditions (MJ/m3@ normal conditions)
If using and alternative fuel supply, contact Eclipse Combustion
with an accurate breakdown of the fuel components.
Air Supply
When a standard RatioMatic Version 3.00 burner is ordered, a
combustion air blower is supplied and mounted directly to the
burner body.
Combustor Type
Select a combustor type based on the application. Low
temperature applications use an alloy combustion tube. High
temperature applications use a silicon carbide (SiC) tube or a
refractory block & holder.
Step 1: Burner Option
Selection

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98 3-3
Combustor Length
Select a combustor length. Optional lengths are available on
some models. Nozzle position will vary with combustor length.
The nozzle position determines the location of heat release.
Control Motor
Select a control motor. Standard control motor options include
various models which Eclipse will mount to the burner.
RatioMatics can be ordered with control motor bracket and
mounting hardware only. Customer supplied control motors
must conform to the these specifications:
•rotation not to exceed 2 rpm.
•minimum torque of 25 in-lb. (2,8 Nm)
•90°stroke.
•continuous modulating or high/low modulating control.
•reversible direction of rotation.
•certain applications may require control motors with a
limit switch or switches if:
-
the burner capacity is to be limited to fit an
application.
- the chamber is to be fired with positive or negative
pressure.
- the chamber pressure is outside the range -1”w.c.
to +1”w.c. (-2,5 to 2,5 mbar)
- there is a need to indicate a high and/or low fire air
butterfly valve (BV) position.
Burner Configuration
Select configuration.
Gas Pipe Connection
Select the gas pipe connection including the pipe thread type and
the turndown required.
The piping, burner gas inlet, and ratio regulator are threaded
using the customer selected pipe thread option.
The high turndown option includes a ratio regulator with an
adjustment for lower inputs.
Flame Supervision
Select a flame rod or an ultraviolet (U.V.) scanner. Both are
available on all RatioMatics. If a flame rod is selected, it will be
factory mounted in the burner. If a U.V. scanner is selected, it
must be ordered separately.
Warning:
A U.V. scanner could possibly detect another burner’s
flame if it is in the line of sight, and falsely indicate flame
presence. Use a flame rod in this situation.This helps
prevent accumulation of unburned fuel which, in extreme
situations, could cause a fire or an explosion.
Nozzle
Combustor
length
Combustor
Inverted
right hand piping
Upright
left hand piping Upright
right hand piping
Configuration selections:
Inverted
left hand piping
Nozzle
position

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
Air Flow Switch
The air flow switch provides a signal to the monitoring system
when there is not enough air pressure from the blower. If a
switch is selected, it will be factory mounted.
Warning:
Eclipse Combustion supports the NFPA regulation
requiring, as a minimum standard for main gas
shut-off systems, the use of an air pressure switch
in conjunction with other system components.
Note:
Standard blower options are listed in Price List 110, additional
blower options are available through Eclipse Combustion. Price
and leadtime may vary.
Power Supply Frequency
Select the 50Hz or 60Hz option. The 50Hz blower motors have
IEC frames and are CE marked. The 60Hz motors have NEMA
frames.
Pressure & Flow
RatioMatics include a combustion air blower.
Blower MotorType
Motor types include various options: voltages, single or three
phase,TEFC or automotive duty enclosures.
Blower Inlet
When selecting an inlet, consider the following:
•amount and size of particles in the air.
•sound requirements.
•space limitations.
•cleanliness requirements of the process.
Motor Orientation
All RatioMatics are assembled with a right-hand blower motor
orientation.
Step 1: Burner Option
Selection (continued)
3-4
Step 2: Blower Option
Selection
Inlet filter Right- hand
blower
motor
Air flow
switch

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
All standard RatioMatics are designed for:
•air:gas ratio controlled combustion.
•10% to 15% excess air at high fire.
•higher excess air at low fire
Burner Control
RatioMatics come with a ratio regulator that maintains the air:gas
ratio.
Air Butterfly
Valve (BV)
Loading Line
Control Motor
Ratio
Regulator
Gas Flow
Heat
•A control signal is sent from a process temperature controller
(sold separately) to the control motor. (Refer to Bulletin
818C or contact Eclipse Combustion for further information
on temperature controllers.)
Control
Signal
Gas Flow
Process
Set Point Process
Controller Control
Motor Air
BV
Ratio
Regulator
Temperature
Pressure
Impulse
•The control motor modulates the air butterfly valve (BV)
which controls the combustion air flow.
•Air pressure in the burner body sends an impulse down the
loading line to the ratio regulator.
•The ratio regulator controls the gas flow in proportion to the
air flow.
Warning:
Do not use other control methods, such as, a fixed-air
control, and do not alter the ratio regulator or burner
piping without prior approval from Eclipse Combustion.
3-5
Step 3: Control
Methodology
Air/Gas Flow
Gas
Air
Stoichiometric
R
a
t
i
o
c
o
n
t
r
o
l
o
p
e
r
a
t
i
o
n
Excess air

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
Ignition Transformer
For the ignition system, use a transformer with:
•secondary voltage 6,000 to 8,000 VAC.
•minimum secondary current 0.02 amps continuous.
•full wave output.
DO NOT USE the following:
•twin outlet transformer
•distributor type transformer.
Trial For Ignition
It is recommended that low fire start be used. However, under
certain circumstances RatioMatics are capable of direct spark
ignition at higher gas inputs.
Most local safety codes and insurance requirements limit the
maximum trial for ignition time (the time it takes for a burner to
ignite). These requirements vary from one location to another;
check your local codes and comply to the strictest codes
applicable.
The time it takes for a burner to ignite depends on the following:
•the distance between the gas shut-off valve and the burner.
•the air/gas ratio.
•the gas flow conditions at start-up.
The possibility exists where the low fire is too low to ignite the
burner within the maximum trial for ignition time. The following
options must be considered under these conditions:
•start at higher gas input levels.
•resize and/or relocate the gas controls.
•use bypass start gas.
3-6
Step 4: Ignition System

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
Ignition Gas Piping
RatioMatics are capable of ignition with either low fire or bypass
start gas.
Low Fire Start:
Main gas
shut-off
valve train
Bypass Start Gas (optional):
Main gas
shut-off
valve train
NC
An optional fuel orifice meter connected in the start gas piping
can simplify start-up and adjustment. To start the burner at the
lowest possible gas input, select a fuel orifice meter for 5”to 10”
w.c. pressure drop when the gas flow is at the burner’s rated low
fire.
3-7
Step 4: Ignition System
(continued)
Optional fuel orifice meter recommended

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
The flame monitoring control system consists of two main
components:
•Flame Sensor
•Flame Monitoring Control
Flame Sensor
Two types can be used on a RatioMatic Burner:
•flame rod
•U.V. scanner
Flame rods are available for all RatioMatic Burner sizes. Further
information can be found in:
•Info Guide 832
A U.V. scanner can be used on all RatioMatic Burner sizes.
Further information can be found in:
•Info Guide 852; 90°U.V. scanner
•Info Guide 854; straight U.V. scanner
•Info Guide 856; self-check U.V. scanner
Flame Monitoring Control
The Flame Monitoring Control processes the signal from the
flame rod,or U.V. scanner, and controls the start-up sequence
and the main gas shut-off valve sequence.
Eclipse Combustion recommends the use of flame monitoring
control systems which maintain a spark for the entire trial for
ignition time when using U.V. scanners. Some of these flame
monitoring models are:
•Veri-Flame; see Bulletin / Info Guide 610,620, 630
•Bi-Flame series; see Instruction Manual 826
•Multi-Flame series 6000; see Instruction Manual 820
DO NOT USE:
•PCI Automatic flame monitoring
•Honeywell RM7890 series flame monitoring
•Flame monitoring relays which interrupt the trial for ignition
when the flame is detected.
•Flame sensors which supply a weak signal.
•Flame monitoring relays with low sensitivity.
3-8
Flame Rod
U.V. Scanner
Step 5: Flame Monitoring
Control System

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
Component Selection
Eclipse Combustion can help in the design of a main gas shut-
off valve train that satisfies the customer and complies with all
local safety standards and codes set by the authorities within
that jurisdiction. Contact Eclipse Combustion for further
information.
Note:
Eclipse Combustion supports NFPA regulations (two gas shut-off
valves as a minimum standard for main gas shut-off systems).
ValveTrain Size
Fuel pressure supplied to the ratio regulator inlet must be within
the range specified in the RatioMatic data sheet. The valve train
should be sized sufficiently to provide the specified pressure.
Warning:
Do not operate RatioMatics with gas inlet
pressure less than the minimum listed on the
RatioMatic Data Sheet. Lower gas inlet pressures
may cause the ratio regulator to remain fully open
at lower inputs as the burner transitions from low
to high fire. This could result in the possible
accumulation of unburned fuel in the burner which,
in extreme situations, could cause a fire or an
explosion.
3-9
Step 6: Main Gas Shut-Off
Valve Train

Eclipse RatioMatic v3.00 - Design Guide No. 110, 04/98
3-10
Blank page

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98 A-1
Appendix
CONVERSION
FACTORS
Metric to English.
From To Multiply By
cubic meter (m3) cubic foot (ft3) 35.31
cubic meter/hour (m3/h) cubic foot/hour (cfh) 35.31
degrees Celsuis (ºC) degrees Fahrenheit (ºF) (ºC x 1.8) + 32
kilogram (kg) pound (lb) 2.205
kilowatt (kW) BTU/hr 3414
meter (m) foot (ft) 3.28
millibar (mbar)
inches water column (“w.c.) 0.401
millibar (mbar) pounds/sq in (psi) 14.5 x 10-3
millimeter (mm) inch (in) 3.94 x 10-2
MJ/m3(normal) BTU/ft3 (standard) 2.491 x 10-2
Metric to Metric.
kiloPascals (kPa) millibar (mbar) 10
meter (m) millimeter (mm) 1000
millibar (mbar) kiloPascals (kPa) 0.1
millimeter (mm) meter (m) 0.001
English to Metric.
From To Mulitply By
BTU/hr kilowatt (kW) 0.293 x 10-3
cubic foot (ft3) cubic meter (m3) 2.832 x 10-2
degrees Fahrenheit (ºF) degrees Celsius (ºC) (ºF –32) ÷1.8
foot (ft) meter (m) 0.3048
inches (in) millimeter (mm) 25.4
inches water column (“wc) millibar (mbar) 2.49
pound (lb) kilogram (kg) 0.454
pounds/sq in (psi) millibar (mbar) 68.95
BTU/ft3 (standard) MJ/m3(normal) 40.14

Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
A-2
RatioMatic
Main Gas Shutoff
Valve Train
Gas Cock
SolenoidValve
(normally closed)
Fuel Orifice Meter
Adjustable Limiting
Orifice
Pressure Regulator
Eclipse Combustion, Inc.
strongly endorses NFPA as a
minimum
Gas cocks are used to
manually shut off the gas
supply on both sides of the
main gas shut-off valve train.
Solenoid valves are used to
automatically shut off the gas
supply on a bypass gas system
or on small capacity burners.
Fuel orifice meters are used to
measure gas flow.
Adjustable limiting orifices are
used for fine adjustment of gas
flow.
NC
KEY TO SYSTEM
SCHEMATICS
These are the symbols used in the schematics.
ALO
Adjusting
Screw
CCW for
more gas
Cap
756
710
760
910
684
742
Symbol Appearance Name Remarks Bulletin/
Info Guide
A ratio regulator is used to
control the air/gas ratio. The
ratio regulator is a sealed unit
that adjusts the gas flow in ratio
with the air flow. To do this, it
measures the air pressure with a
pressure sensing line, the impulse
line. This impulse line is
connected between the top of
the ratio regulator and the
burner body.
A pressure regulator reduces
gas pressure to a stable, usable
pressure.
Ratio Regulator