管道直燃燃烧器使用说明

SDB系列空调管道直燃燃烧器使用说明书。

Shenzhen Sunsrays heating Science And Technology Company

Add:Rm.1308,Shenzhen University Town Business Park,Li Shan Rd.,Nan Shan Dist.,518055,Shen Zhen,China

Tel:0086-755-86635378;Fax:0086-755-26748751

Web-site:http://www.77cn.com.cn "D"Series Air Heat Burners

Duct Burner System

SUNSRAYS'"D"Series Air Heating Burner and Duct Burner System Application Manual

SDB系列空调管道直燃燃烧器使用说明书。

Contents

Section1Introduction

Section2Design Calculations

Section3Burner Mounting Arrangements

Section4"D"series Duct Burner Systems

APPENDIX A"D"series Calculation Method&Examples

APPENDIX B Flame Lengths

APPENDIX C Combustion Air Flow Calculations

APPENDIX D Burner Assembly Parts–Isometric View

APPENDIX E Pilot,Ignition&Flame Sensing Options

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SDB系列空调管道直燃燃烧器使用说明书。

-3-Section 1Introduction

SUNSRAYS "D"series Air Heating Burners and "D"series Duct Burner systems are designed to provide a high efficiency,high turndown,low emission solution for air replacement or “make-up”air heating applications.

They are ideally suited to offer precise temperature control for applications such as:?Paint spray booth air heating -spray and bake cycles ?Parts dryers ?HVAC air replacement schemes for factories,warehouses,distribution centres …?Crop dryers

SUNSRAYS "D"series burner assemblies can either be supplied as:

A.Individual units for integration into “customer”designed air heating modules.

or within

B."D"series Duct Burner systems which also incorporate a duct mounting plate,modulating gas valve train &control box.

or as

http://www.77cn.com.cnplete air heater assemblies,built to client specifications to include a "D"series Duct Burner and an air circulation fan.

SUNSRAYS "D"series burner assemblies operate directly within the heated air flow and can be located either upstream or downstream of the main air supply fans.

Specifications

Firing rates -up to 220kW (750,000Btu/h)per 12inch (305mm)burner length

Process air velocity range -7.5to 18m/s (1500to 3500ft/min)

Differential air pressure range

-0.5to 3.0mbar (0.2to 1.2in w.g).(across the burner)Turndown

-up to 30:1Efficiency -100%based on LHV*(92%based on Gross CV**)

Burner head gas pressure range -Natural Gas :6-20mb at full output Propane :2-

8mb at full output Burner head orientation

-Either horizontal or vertical parallel to air flow Burner head configuration

-Straight (standard)“H”or “I”arrangements (on request)Flame lengths -Natural:280–405mm (11–16in)Propane:205–330mm (8–13in)

Emissions -<5ppm CO and <0.5ppm NO2up to 65ºC temperature rise across the burner

Process Air Temperatures -up to 100ºC (standard)(for higher temperatures please consult SUNSRAYS)

Construction -Either :cast iron burner casting +stainless steel baffles or :aluminium +stainless steel baffles

*Lower Heating Value (gas)**Gross Calorific Value (gas)

SDB系列空调管道直燃燃烧器使用说明书。

-4-Section 2Design Calculations

SUNSRAYS'DbCalc©software is available to determine burner ratings and to specify minimum duct dimensions/profile plate designs.

Input data required:

A.Airflow (Nm3/h or scfm)

B.Minimum “air on”temperature

(ºC or ºF)C.Maximum “air off”temperature (ºC or ºF)

D.Preferred firing rate (kW or Btu per ft (305mm)section)

SUNSRAYS can help you calculating:

1.Heat input required (kW or Btu/h)

2.Burner length (mm or inches)

3.Minimum duct width &height (mm or inches)

4.Profile plate dimensions (mm or inches)

5.Burner turndown (&minimum achievable heat input)

6.Required air pressure drop across the burner

7.Burner head gas pressure for either natural gas or propane

Please refer to Appendix A for Calculation Method &Examples

SDB系列空调管道直燃燃烧器使用说明书。

-5-Section 3Burner Mounting Arrangements

For “make-up air”or “air replacement”heating applications,SUNSRAYS'"D"series burners normally operate with 100%fresh air.

For spraybooth,dryer or process oven applications it is important that adequate fresh air is available at all times to meet the combustion requirements of the burner.(Refer to Appendix D for combustion air flow calculation details)

It is important to maintain a laminar airflow around the burner and should be located in the centre of the profile.(Any reinforcements used in the profile construction should be located on the downstream side of the profile).The profile plate should be constructed such that the width is fixed but adjustments incorporated above and below the burner (+/-2”–50mm is typical).

The burner can be mounted horizontally or vertically.

The preferred method of operation is for the burner to be located upstream of the

main

circulation fan so that the fan acts as a mixing device,eliminating any temperature stratification at the outlet of the heating unit.

SDB系列空调管道直燃燃烧器使用说明书。

-6-Push-Through Arrangement

The "D"series burner will also operate satisfactorily when located downstream of the circulation

fan.

For these applications an “air screen”(see example below)can be located before the burner,to create the required laminar flow.

SDB系列空调管道直燃燃烧器使用说明书。

-7-Duct Elbow/Bend Considerations

The diagrams below should be used as a guide to the minimum distances that should be allowed to/from outlet/inlet duct bends.

Burner Configurations

"D"series burners can be configured using a combination of components assemblies as shown below:Gas Manifold Requirements

Maximum length of burner :End inlet (1.5”):48”(1220mm)Rear Inlet (2”):78”(1980mm)

For burner

lengths >78”(1980mm)multiple rear inlet connections will be required –refer to SUNSRAYS for suitable gas manifold design arrangements.

SDB系列空调管道直燃燃烧器使用说明书。

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SDB系列空调管道直燃燃烧器使用说明书。

-9-Circulation Air Fan Specification Requirements

When selecting a circulation

fan the

available

air pressure must take account of the required pressure drop across the burner in addition to all other system requirements.

SDB系列空调管道直燃燃烧器使用说明书。

Section4DB Duct Burner Assemblies Typical SUNSRAYS"D"series Duct Burner Assembly

1)"D"series Duct Burner

2)profile plate

3)combustion chamber

4)intake louvers

5)main volume fan

6)sequencing control panel

7)differential air pressure switch

8)high tempera-ture protection

9)safety shut-off valves

10)vent valve

11)gas filter

12)control valve

13)pilot gas train

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SDB系列空调管道直燃燃烧器使用说明书。

-11-APPENDIX A Calculation Method &Examples

SUNSRAYS normally uses the following formula to calculate the required net heat input:

Q (kW)=Airflow (Nm3/s)x Temperature rise (ºC)x Air Density x Specific Heat of Air

or

Q (Btu/h)=Airflow (scfh)x Temperature rise (ºF)x Air Density x Specific Heat of Air

The required gross gas input =Required net heat input/0.92

The gross gas input ÷firing rate per 12”(305mm)section will determine the required burner length.Minimum section length =6”(150mm).

Example:

A.Airflow =5Nm3/s

B.“Air on”temperature =-5ºC

C.“Air off”temperature

=25ºC D.Preferred firing rate =600,000Btu /176kW)per 12”(305mm)section

Required net heat input =181kW

Required gross gas input =197kW

Number of 6”(152.5mm)sections =197÷176=1.12x 2=2.24which is “rounded up”to 3.

Total burner length =3x 6”=18”(or 3x

152.5mm =458mm)The required net profile area (excluding the burner)=Airflow/Profile velocity (determined by burner firing rate)Net Profile Area (excluding burner)=5Nm3/s/14.7m/s =0.34m2

Total Profile Area (including burner)=Net Profile Area +Burner Profile Area (0.03m2/6”burner section)=0.34+0.09=0.43m2

Required width of the profile opening =Total burner length +100mm (4”)=558mm (rounded to 560mm)Required height of the profile opening =Total Profile Area/Required Width of Profile Opening

=0.43x 106/558=770mm

Minimum duct width =Burner length +305mm (152.5mm

at either side)=763mm (rounded to 770mm)Minimum duct height =Height of profile opening +200mm (8”)=970mm

SDB系列空调管道直燃燃烧器使用说明书。

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-APPENDIX B Flame Lengths (mm)

SDB系列空调管道直燃燃烧器使用说明书。

-13-APPENDIX C Combustion Air Flow Calculations

SUNSRAYS "D"series duct burners typically operate with 100%fresh air.

For applications where a percentage of the heated air is to be re-circulated the a minimum volume of fresh air must pass across the burner.

As a “rule of thumb”the volume of air required for operation at 20%excess air is given by:

AirVOL =(Q/CV)x SAGR x 1.2

where AirVOL =Air Volume per hour (m3/h or ft3/h)Q =Heat Input (kW or Btu/h)CV =Gas Calorific Value (kWh/m3or Btu/ft3)

SAGR =Stoiciometric Air/Gas Ratio (m3AIR/m3GAS or ft3AIR/ft3GAS)

Typical Calorific Values for Natural Gas and Propane are:

Natural Gas =10kWh//m3or 1000Btu/ft3Propane =25kWh//m3or 2500Btu/ft3

Stoiciometric Air/Gas Ratios (SAGR)for Natural Gas and Propane are:

Natural Gas =10Propane =25

Example 1

Heat input =200kW Fuel =Natural Gas

Airvol (m3/h)=(200/10)x 10x 1.2=240m3/h

Example 2

Heat input =1,000,000Btu/h Fuel =Natural Gas

Airvol (ft3/h)=(1,000,000/1000)x 10x 1.2=12,000ft 3/h

Example 3

Heat input =400kW Fuel =Propane Gas

Airvol (m3/h)=(400/25)x 25x 1.2=480m3/h

Example 4

Heat input =1,500,000Btu/h Fuel =Propane Gas

Airvol (ft3/h)=(1,500,000/2500)x 25x 1.2=18,000ft3/h

SDB系列空调管道直燃燃烧器使用说明书。

APPENDIX D Burner Assembly Parts–Isometric Views

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SDB系列空调管道直燃燃烧器使用说明书。

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APPENDIX E Pilot,Ignition &Flame Sensing Options

SUNSRAYS "D"SERIES BURNER

PILOT ASSEMBLY

NATURAL:M1200350

PROPANE:M1200450SUNSRAYS "D"SERIES BURNER PILOT ASSEMBLY NATURAL:M1190850PROPANE:M1190950

SDB系列空调管道直燃燃烧器使用说明书。

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