Eclipse ThermJet TJ0015 Leitfaden

Models TJ0015 – TJ2000

Version 2

Eclipse ThermJet

Burners

3/5/07

Design Guide 205

Eclipse ThermJet Design Guide No. 205, 3/5/07

DisClaimer NotiCe

liability aND

WarraNty

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, Inc.

In accordance with the manufacture’s policy of continual prod-

uct improvement, the product presented in this brochure is

subject to change without notice or obligation.

The material in this manual is believed adequate for the intend-

ed use of the product. If the product is used for purposes other

than those specied herein, conrmation of validity and suit-

ability must be obtained. Eclipse warrants that the product itself

does not infringe upon 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 nd errors or omissions,

please bring them to our attention so that we may correct

them. In this way we hope to improve our product documenta-

tion for the benet of our customers. Please send your cor-

rections and comments to our Marketing Communications

Manager.

It must be understood that Eclipse’s liability for its product,

whether due to breach of warranty, negligence, strict liability,

or otherwise is limited to the furnishing of replacement parts

and Eclipse 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, or damage to material arising in

connection with the sale, installation, use of, inability to use, or

the repair or replacement of Eclipse’s products.

Any operation expressly prohibited in this Guide, any adjust-

ment, or assembly procedures not recommended or authorized

in these instructions shall void the warranty.

Eclipse ThermJet Design Guide No. 205, 3/5/07

auDieNCe

relateD DoCumeNts

About this manual

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. 205

This document

Data Sheet No. 205-1 through 205-13

Available for individual TJ models

Required to complete design calculations in this guide

Installation Guide No. 205

Used with Data Sheet to complete installation

Price List No. 205

Used to order burners

EFE 825 (Combustion Engineering Guide)

Eclipse bulletins and Info Guides:

610, 710, 720, 730, 742, 744, 760, 930

Purpose

The purpose of this manual is to make sure that the design of a

safe, effective and trouble-free combustion system is carried out.

•

thermJet DoCumeNts

Eclipse ThermJet Design Guide No. 205, 3/5/07

DoCumeNt

CoNveNtioNs

hoW to get help

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 qualied and well trained personnel are

allowed to carry out these instructions or proce-

dures.

Act with great care and follow the instructions.

Warning:

Indicates hazards or unsafe practices 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 care-

fully.

Note:

Indicates an important part of the text. Read thoroughly.

If you need help, contact your local Eclipse representative.You

can also contact Eclipse at:

1665 Elmwood Rd.

Rockford, Illinois 61103 U.S.A.

Phone: 815-877-3031

Fax: 815-877-3336

http://www.eclipsenet.com

Eclipse ThermJet Design Guide No. 205, 3/5/07

Table of contents

Introduction

Product Description.......................................................................... 6

Figure 1.1 The ThermJet Burner ..................................................... 6

Safety

Introduction ........................................................................................ 7

Safety..................................................................................................... 7

Capabilities ......................................................................................... 8

Operator Training............................................................................... 8

Replacement Parts............................................................................. 8

System Design

Design................................................................................................... 9

Step 1: Burner model selection....................................................... 9

Step 2: Control Methodology.......................................................... 10

Figure 3.1: Modulating gas & air:

On-ratio control or excess air @ low re............................ 12

Figure 3.2: Modulating gas with xed-air control ...................... 13

Figure 3.4: High/Low gas with xed-air control ........................ 15

Step 3: Ignition System..................................................................... 16

Figure 3.5: Bypass start gas circuit schematics ........................... 17

Step 5: Combustion Air System: Blower

and air pressure switch ............................................................. 19

Table 3.1: Required calculation information................................ 20

Table 3.2: Fuel gas heating values................................................... 20

Example blower calculation............................................................. 21

Step 6: Main gas shut-off valve train.............................................. 22

Step 7: Process Temperature Control System............................ 22

Appendix

Conversion Factors ........................................................................... 23

Key to System Schematics ............................................................... 24

Eclipse ThermJet Design Guide No. 205, 3/5/07

Introduction

proDuCt

DesCriptioN

The ThermJet is a nozzle-mix burner that is designed to re an

intense stream of hot gases through a combustor using ambient

combustion air.

The high velocity of the gases improves temperature uniformity,

product quality and system efciency.

The ThermJet burner comes in two types:

High Velocity (HV)

Medium Velocity (MV)

The gas velocity can be as high as 500 ft/s for the High Velocity

burner, and 250 ft/s for the Medium Velocity burner.

•

Figure 1.1 The ThermJet Burner

Eclipse ThermJet Design Guide No. 205, 3/5/07

Important notices about safe burner operation will be found in

this section. Read this entire manual before attempting to start

the system. If any part of the information in this manual is not

understood, then contact your local Eclipse representative or

Eclipse, Inc. before continuing.

Danger:

The burners covered in this manual are designed

to mix fuel with air and burn the resulting mix-

ture. All fuel burning devices are capable of

producing res and explosions when improperly

applied, installed, adjusted, controlled or main-

tained.

Do not bypass any safety feature. Fires and ex-

plosions can be caused.

Never try to light the burner if the burner shows

signs of damage or malfunctioning.

Warning:

The burner is likely to have HOT surfaces. Al-

ways wear protective clothing when approaching

the burner.

Note:

This manual gives information for the use of these burners

for their specic design purpose. Do not deviate from any in-

structions or application limits in this manual without written

advice from Eclipse, Inc.

Safety 2

iNtroDuCtioN

safety

Eclipse ThermJet Design Guide No. 205, 3/5/07

Warning:

Eclipse products are designed to minimize the

use of materials that contain crystalline silica.

Examples of these chemicals are: respirable

crystalline silica from bricks, cement or other

masonry products and respirable refractory

ceramic bers from insulating blankets, boards,

or gaskets. Despite these efforts, dust created by

sanding, sawing, grinding, cutting, and other con-

struction activities could release crystalline silica.

Crystalline silica is known to cause cancer, and

health risks from the exposure to these chemi-

cals vary depending on the frequency and length

of exposure to these chemicals. To reduce this

risk, limit exposure to these chemicals, work in a

well-ventilated area and wear approved personal

protective safety equipment for these chemicals.

Adjustment, maintenance and troubleshooting of the mechanical

and the electrical parts of this system should be done by quali-

ed personnel with good mechanical aptitude and experience

with combustion equipment.

The best safety precaution is an alert and competent opera-

tor. Thoroughly instruct new operators so they demonstrate

an adequate understanding of the equipment and its operation.

Regular retraining must be scheduled to maintain a high degree

of prociency.

Order replacement parts from Eclipse only. Any customer-sup-

plied valves or switches should carry UL, FM, CSA,CGA and/or

CE approval where applicable.

Capabilities

operator traiNiNg

replaCemeNt parts

safety (CoNtiNueD)



Eclipse ThermJet Design Guide No. 205, 3/5/07

System Design 3

DesigN

Step 1: Burner model selection

Design structure

Designing a burner system is a straight-forward exercise of

combining modules that add up to a reliable and safe system.

The design process is divided into the following steps:

1. Burner model selection:

The burner size and quantity

The ame velocity

The fuel type and pressure

The combustor type

2. Control methodology

3. Ignition system

4. Flame monitoring system

5. Combustion air system: blower and air pressure switch

6. Main gas shut-off valve train selection

7. Process temperature control system

Burner size and quantity

Select the size and number of burners based on the heat bal-

ance. For heat balance calculations, refer to the Combustion

Engineering Guide (EFE 825).

Performance data, dimensions and specications are given for

each ThermJet model in Data Sheets 205-1 through 205-13

Flame velocity

Each burner size comes in two versions, High or Medium

Velocity. Select the version needed based on requirements for

temperature uniformity, circulation, chamber size, air pressure

and overall operating costs.

Flame velocity information is available in Data Sheets 205-1

through 205-13

10 Eclipse ThermJet Design Guide No. 205, 3/5/07

Fuel type & fuel pressure

The usable fuel types are:

Natural gas

Propane

Butane

For other fuels less than 800 Btu/ft (330 MJ/m

) contact Eclipse

Combustion with an accurate breakdown of the fuel contents.

The gas pressure must be at the minimum level shown.

The required gas pressure at the burner can be found in Therm-

Jet Data Sheets 205-1 through 205-13

Combustor

The combustor that you choose depends on the temperature

and the construction of the furnace.

The furnace temperature limits of the combustors can be found

in ThermJet Data Sheets 205-1 through 205-13

The control methodology is the basis for the rest of the design

process. Once it is known what the system will look like, the

components that are in it can be selected. The control method-

ology chosen depends on the type of process to be controlled.

Note:

The stated operational characteristics only apply if the de-

scribed control circuits are followed. Use of different control

methods will result in unknown operational performance

characteristics. Use the control circuits contained within this

section or contact Eclipse Combustion for written, approved

alternatives.

•

Step 2: Control Methodology

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