Technical Data; Functional Description - Herrmann HLZ 45 A/BV Montage- Und Betriebsanleitung

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1. Technical Data

1.1 Range of models
Type Oil nozzle
(US gal/h 80°H) m in kg/h
HLZ 45 AV17 G1 0,30
HLZ 45 AV17 G1 0,35
HLZ 45 AV19 G1 0,40
HLZ 45 AV19 G1 0,45
HLZ 45 AV22 G1 0,55
HLZ 45 AV22 G1 0,60
HLZ 45 AV24 G1 0,60
HLZ 45 AV24 G2 0,65
HLZ 45 AV24 G2 0,75
HLZ 45 AV24 G2 0,85
Image: Model code H L Z 45 A V 19 G1
H
L
Z
45
A
V
19
G1
1.2 Certification
European Standard (EN) 267:1999-11, class 3
1.3 Operating range
The operating range diagram of an oilburner describes the maximum fur-
nace pressure dependig on the oil mass flow. For a reliable start up the
burner may alternatively be started in the first or second stage. While it is
preferable for the burner to start in the lower power area in the second
stage, a start in the middle or upper power area in the first stage is ad-
vantageous. The diagram below also shows the corresponding starting
points. The range of operation has been determined on a test boiler in ac-
cordance with DIN EN 267:1999-11 and relates to a height of 100 metres
MSL, as well as to a room tem-perature of 20ºC. The maximum achievable
firing rate depends on the respective starting resistance of the heating
system. This is influenced by the geometry of the heating system and the
heat exchanger, as well as the flue gas system.
2. stage
(starting point)
1. stage
HLZ 45 AV 17 G1
1.4 Standard scope of delivery
1 Oil burner without covering cap
1 Unit flange
1 Seal for the flange
2 Odour-proof oil tubes (length 1,100 mm)
4 Fastening screws M8 x 30 for unit or shift flanges including washers
1 Hexagon key, nominal size 4 mm
1 7-pin part of Euro female connector in accordance with DIN
4791:1985-09 (a plug connector for the boiler is not included in the
scope of delivery)
1 Oil nozzle
1 Assembly and operating instructions
1.5 Fuel
EL heating oil and EL heating oil sulphur free in accordance with DIN
51603, part 1: 2003-09
Oil throughput Fuel power
Q in kW
F
0,84 – 1,52 10 – 18
1,10 – 1,85 13 – 22
1,18 – 2,02 14 – 24
1,35 – 2,53 16 – 30
1,69 – 3,04 20 – 36
1,94 – 3,37 23 – 40
2,19 – 3,54 26 – 42
2,28 – 4,05 27 – 48
2,45 – 4,38 29 – 52
2,78 – 4,72 33 – 56
Herrmann
Light oil burner
Two-stage
Series
Mixing device
Pre-heater
Diameter air nozzle (17, 19, 22, 24)
Size of blower (G1 HRG 134, G2 RG 148)
Operating range
HLZ 45 AV 24 G2
HLZ 45 AV 24 G1
HLZ 45 AV 22 G1
HLZ 45 AV 19 G1
1. stage
(starting point)
1.6 Components
Components
Blower
Motor
Oil pump
Oil pre-heater
Ignition
Flame control
Firing unit
Communication interface (CI)
1.7 Electrical data
Nominal voltage
Starting line
Operating power
Contact rating of heat valve and switch 6A~ at minimum
1.8 Packing
Individual packing (carton), basic surface x height: 400 x 400 x 500 mm
Weight of burner without packaging material: approximately 1.2 kg
Weight of burner including packaging material: approximately 13.0 kg
Bulk shipment
(18 single cartons on Euro pallet), basic surface x height: 1200 x 800 x
1700 mm
Weight of pallet: approximately 254 kg

2. Functional description

The HLZ 45 oil burner is designed as two-stage blue flame burner for ope-
ration with EL heating oil. A two-stage gear pump is used for fuel injection.
The injected mass of fuel depends on the size of the nozzle and the in-
jection pressure adjusted at the respective pressure balance valves of the
respective load stage (5bar<pE<26bar). For adjustment of the air volume
flow to the injected fuel mass flow a regulating speed blower is intended.
During the operation of the burner and before each burner start up the
fuel is heated to a temperature of approximately 70º C in an electric fuel
heater. Through this process, temperature and quality conditioned fluctua-
tions of the fuel viscosity that have an effect on the spraying process and
the fuel proportion are decreased. The fuel spray is ignited by an electric
spark gap that is formed by the application of high voltage between two
initiating electrodes. Subsequently we will go into the function of the in-
dividual sub-systems in more detail.
2. stage
2.1 Mixing device
A blue flame burner mixing device is used to burn the mix. The fuel spray
that es-capes from the nozzle evaporates before the actual reaction of
combustion by a mixture of hot flue gases. The low level of temperature
within the evaporating zone and the water content of the drawn-in flue
gases prevent the formation of smoke spot. The intensity of the backflow
is indicated by the rate of re-circulation that mea-sures the proportion of
the re-circulated flow of flue gas of the entire gas mass flow. Low rates of
re-circulation favour the formation of smoke spot. The solid state of smoke
spot particles confers a yellow colour to the flame. An increase in the re-
cir-culation of flue gas reduces the rate of smoke spot formation and ul-
timately results in a completely smoke spot-free flame that emits a hardly
visible blue flame to the human eye.
In order to achieve an intensive re-circulation of flue gas over the entire
performance range and high stability of the flame the combustion air is
supplied in a swirl-free jet. The image below shows schematically the
mode of operation of the mixing device. The combustion air enters
through a nozzle into the flame pipe.
Due to the rapid cross-sectional enlargement of the air jet a vacuum
accrues at the edge of the air nozzle through which the hot flame gases
are transported from the inside of the flame conduit into the evaporating
zone. Besides this, cooled flue gases reach through openings of the flame
tube from the combustion chamber into the evaporating zone. In addition,
a backward zone is developed in the flame's rotation centre due to the
swirled flow of the combustion air.
Besides the avoidance of smoke formation the intensive return of flue ga-
ses to the flame's root also achieves a reduction of nitrogen oxide emis-
sions (NOx). Two mechanisms essentially help this occur.
On the one hand the oxygen partial pressure of the mixture is reduced.
Therefore the local concentration of dissociated oxygen molecules that
react with the nitrogen of the combustion air to NOx is reduced . On the
Manufacturer Designation of model
ebm-papst HRG 134 / RG 148
ACC EB 95 C 35 / 2
Danfoss BFP 52 E L3
Danfoss FPHB 5, PTC 50,
T 60/32, 30-90 W
Danfoss/Beru EBI 4/ZTÜ with flame
monitoring
BST-Solutions Wide Band Flame
Detector KLC 2002
Elster CM 168
Herrmann CI 1
230 V ~50 Hz
approximately 180 W
approximately 130 W–270 W