Riello DB 6 LSE C13 Quick start guide

Istruzioni per installazione, uso e manutenzione

Installation, use and maintenance instructions

Instructions d'installation, d'utilisation et d'entretien

Bruciatori industriali policombustibile gasolio/gas

Light Oil/Gas dual fuel industrial burners

Brûleurs industriels polycombustible fioul/gaz

20023874 (2) - 06/2010

DB 6 LSE C13

Funzionamento modulante

Modulating operation

Fonctionnement modulant

General warnings

Informations about the This handbook is a supplement to the burner and must always be kept

handbook with it. It should be read carefully as it supplies important

information for installation, use and maintenance; it should be kept

in a safe place for future consultation.

Who should receive it This handbook has been prepared for people who already have a

working knowledge of all aspects involving oil and gas burners.

These aspects refer to:

- installation;

- use;

- maintenance;

- safety.

Those who receive the handbook should also have qualified and suf-

ficient experience in this sort of appliance and typical working envi-

ronments.

Relative documentation - Gas trains

- Control panel diagram

- Output regulator (modulating)

Index

CHAPTER1Introduction . . . . . . . . . . . . . . . . . . . . pagina 3

Selection code descriptions. . . . . . . . . . . . . . . . . . . . . . 3

Specification of the burner type and coding . . . . . . . . . . . . . 3

CHAPTER 2Burner description. . . . . . . . . . . . . . . . . . . . . 4

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Firing rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Burner components . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overall dimensions – Burner weight . . . . . . . . . . . . . . . . . 6

Air side pressure drop . . . . . . . . . . . . . . . . . . . . . . . . 7

Gas side pressure drop . . . . . . . . . . . . . . . . . . . . . . . . 8

CHAPTER 3Installation. . . . . . . . . . . . . . . . . . . . . . . . . 9

Installation positions . . . . . . . . . . . . . . . . . . . . . . . . . 9

Blast tube length . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . 9

Accessibility to the interior of the combustion head . . . . . . . . . 9

CHAPTER 4Fuel supply . . . . . . . . . . . . . . . . . . . . . . . .10

General gas supply layout (example). . . . . . . . . . . . . . . . 10

Choice of nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Pressure variation. . . . . . . . . . . . . . . . . . . . . . . . . . 11

Hydraulic system layout . . . . . . . . . . . . . . . . . . . . . . 12

CHAPTER 5Preparation for start up . . . . . . . . . . . . . . . . . .13

Combustion head adjustment . . . . . . . . . . . . . . . . . . . . 13

Gas train - pilot connection. . . . . . . . . . . . . . . . . . . . . 14

Ignition pilot . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Electrodes positioning . . . . . . . . . . . . . . . . . . . . . . . 15

Control box for the air/fuel ratio (LMV52...) . . . . . . . . . . . 15

Actuator (SQM48.4....) . . . . . . . . . . . . . . . . . . . . . . . 18

Pressure switches setting . . . . . . . . . . . . . . . . . . . . . . 20

Periodic checks . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

CHAPTER 6Maintenance . . . . . . . . . . . . . . . . . . . . . . . .22

Problems and remedies . . . . . . . . . . . . . . . . . . . . . . . 22

CHAPTER 7Wiring diagrams. . . . . . . . . . . . . . . . . . . . . .24

1Introduction

1.1 Selection code description 1.2 Specification of the burner type

and coding

DB 6 S TC A-0

supply

A-0 = from below

A-90 = from the right

Combustion head

TC = standard head

Fuel

S= natural gas

P= LPG

Adjustment

E= electronic cam

Size

Series

N= fuel oil

NS = fuel oil / natural gas

NP = fuel oil / LPG

NA = fuel oil assisted atomisation

L= light oil

TL = long head

Combustive air

NAP = fuel oil assisted atomisation / LPG

M= progressive (modulating, mechanical cam)

LS = light oil / natural gas

LP = light oil / LPG

NAS = fuel oil assisted atomisation / natural gas

TXL = special head

A-180 = from above

A-270 = from the left

4 - 6

HS = low emissions

TYPE CODE

DB 6 LSE C13 A0 20004685

2Burner description

2.1 Technical data

2.2 Firing rate

Model DB 6

Capacity Min./Max. natural gas [kW] 4000 ÷ 7800

Output adjustment Modulating

Combustibile Natural gas (G 20) - Net calorific value 10 kWh/Nm3

Natural gas (G 25) - Net calorific value 8,6 kWh/Nm3

Combustive air temperature Max. 150 °C

Electrical supply 230 V+/-10%50/60 Hz

Ignition Pilot burner

Flame control Standard (1 stop in 24 hours)

Continuous self-check (on request)

Air temperature

7800

66004000

1400

150°C

50°C

250°C

DB6

GAS

5850

Air temperature

D8871

Fig. 1

CHAPTER 2Burner description

2.3 Burner components

Key

1Air box

2Cover

3Gas delivery regulator

4Control box base for electrical connections

5Boiler attachment flange

6Combustion head

7Gas servomotor

8Air servomotor

9Air pipe attachment flange

10 Flame inspection window

11 Photocell

12 Air pressure switch

13 Maximum gas pressure switch

14 Maximum oil pressure switch on return circuit

15 Pressure gauge nozzle return

16 Pressure gauge nozzle delivery

17 Gauge level (0-90) pressure speed gear

18 Pilot burner

19Burner opening hinge

20 Atomisation nozzle-holder

21 Pilot gas train

Fig. 2

7894

12 13

16 17

19 20

5 6

D10366

CHAPTER 2Burner description

2.4 Overall dimensions – Burner weight

The weight of the burner is shown in table:

Modello kg

DB 6 LSE C13 270

Air duct connection Fixing to the boiler

FLANGE DIMENSIONS

Gas supply

D7549

Fig. 4 Fig. 5 Fig. 6

Fig. 3

D10368

301391

692

355 710

173

1724

428

450

812

659

485

D10367

435

350

DN 80

160

D3974

CHAPTER 2Burner description

2.5 Air side pressure drop (taken upstream from the completely open air damper)

The pressure curves refer to the different adjustment conditions for the combustion head in accordance to the table on page 14.

Refer to Paragraph 5.1.

In the case of air supply at a higher temperature than 20°C and/or an altitude higher than 100 m. a.s.l., the pressure drop in the

head that is shown in the graph must be multiplied by the Kccoefficient as indicated in the table below.

Example for DB 4

Burnt output = 4000 kW - Altitude = 750 m. a.s.l. - Combustive air temperature = 120 °C

From the diagram, with an output of 4000 kW, a total head pressure drop is shown of: 'p20 = 20 mbar (combustive air at 20 °C

and altitude 100 m. a.s.l.).

The table gives a multiplying coefficient, for combustive air at 120 °C and altitude 750 m. a.s.l., equal to Kc= 1,449.

The total pressure drop of the burner head is:

'p= 'p20 x Kc= 20 x 1,449 = 29 mbar.

Altitude Kc

Air temperature °C

m. a.s.l. 0 20 30 40 50 60 70 80 90 100 120 140 150

0 0,920 0,988 1,021 1,055 1,089 1,122 1,156 1,190 1,223 1,257 1,325 1,392 1,426

100 0,932 1,000 1,034 1,069 1,103 1,137 1,171 1,205 1,239 1,273 1,342 1,410 1,444

500 0,976 1,047 1,083 1,119 1,155 1,190 1,226 1,262 1,298 1,333 1,405 1,477 1,512

750 1,007 1,080 1,117 1,154 1,191 1,228 1,265 1,302 1,338 1,375 1,449 1,523 1,560

1000 1,038 1,114 1,152 1,190 1,228 1,266 1,304 1,342 1,380 1,418 1,494 1,570 1,608

1250 1,069 1,147 1,186 1,226 1,265 1,304 1,343 1,382 1,421 1,460 1,539 1,617 1,656

1500 1,102 1,182 1,223 1,263 1,304 1,344 1,384 1,425 1,465 1,505 1,586 1,667 1,707

1750 1,130 1,213 1,254 1,295 1,337 1,378 1,419 1,461 1,502 1,544 1,626 1,709 1,751

2000 1,174 1,260 1,303 1,346 1,389 1,432 1,475 1,518 1,561 1,604 1,690 1,776 1,819

2250 1,206 1,294 1,338 1,382 1,427 1,471 1,515 1,559 1,603 1,647 1,736 1,824 1,868

2500 1,251 1,343 1,389 1,434 1,480 1,526 1,572 1,618 1,664 1,709 1,801 1,893 1,939

2750 1,284 1,378 1,425 1,472 1,519 1,566 1,613 1,660 1,707 1,754 1,848 1,942 1,989

3000 1,320 1,417 1,465 1,514 1,562 1,610 1,659 1,707 1,755 1,804 1,901 1,997 2,046

0 1000 2000 4000 6000 8000

mbar

D8326

Fig. 7

Potenza bruciatore Pb [kW]

'p[mbar]

CHAPTER 2Burner description

2.6 Gas side pressure drop

mbar

0 1000 2000 4000 6000 8000

G20

G25

0 1000 2000 4000 6000 8000

mbar

G20

G25

D8328

D8327

Pb (Burner output) [kW]

Fig. 8

'p[mbar]

Gas pressure on the basis of the

maximum output developed by

the burner is given by the curves

in Fig. 8.

It represents the pressure drop

in the combustion head.

Natural gas G 20 - Net calorific

value = 10 kWh/Nm3

The curves were taken in the fol-

lowing conditions:

• pressure measured at the test

point on the pressure switch

downstream from the gas but-

terfly valve;

• combustion chamber at 0

mbar;

• burner working at full output.

The pressure drop of the com-

pletely open butterfly valve is

given in Fig. 9.

Head pressure drop

Butterfly valve pressure drop

Fig. 9

Pb (Burner output) [kW]

'p[mbar]

3Installation

3.1 Installation positions

Horizontal installation

The burner is available in various models to be installed with the air intake from below or above.

3.2 Blast tube length (Fig. 10)

The length of the blast tube must be selected according to the indications provided by the manufacturer of the boiler, and in any

case it must be greater than the thickness of the boiler door complete with its fettling. For boilers with front flue passes 1) or flame

inversion chambers, protective fettling in refractory material 5) must be inserted between the boiler fettling 2) and end cone 4).

This protective fettling must not compromise the extraction of the blast tube. For boilers having a water-cooled front the refractory

fettling 2)-5)(Fig. 10) is not required unless it is expressly requested by the boiler manufacturer.

3.3 Securing the burner to the boiler (Fig. 10)

• Prepare an adequate system of hoisting by

hooking onto the rings 3).

• Slip the thermal protection (standard equip-

ment) onto the blast tube 4).

• Place entire burner on the boiler hole

arranged previously and fasten with the

screws given as standard equipment.

The coupling of the burner-boiler must be

air-tight.

3.4 Accessibility to the interior of the combustion head (Fig. 11) (Optional)

• Switch off the electrical power.

• Unscrew the locknut 6) and release the tie rod 7).

• Remove the 4 fixing screws 1).

• Open burner at hinge (see Fig. 11) (only optional).

• Disconnect the wires of the electrode and the

probe 2).

• Turn the under part of the elbow 3) anticlockwise

until it comes free of its slot.

• Unscrew screw 4) with pressure test point.

• Extract the internal part 5) of the combustion

head.

• With burner closed, the accessibility to the interior

combustion head is possible by removing the

cover 8).

Fig. 10 D8772

Fig. 11 D8773

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