Light Scattering Real Time Dust Density Monitor System

Light Scattering Real Time Dust Density Monitor System
Light Scattering
Real Time
Dust Density Monitor System
High sensitivity
Durable and reliable
Ultra low maintenance
Simple installation
URL: http://www.tanaka-e-lab.com
Contact: office@tanaka-e-lab.com
The dust contained in flue gas can cause environmental pollutions and health issues,
and reducing the dust emitted from a plant/factory is global demand. In many countries the governments enforce air pollution law. Tanaka Electric Lab. dust monitor system helps to run a plant/factory
more cleanly and efficiently and to establish corporative compliance and CSR (Corporate Social Responsibility).
Tanaka Electric Laboratory DDM-fC high performance real-time
DDM-f C Dust Monitor System
dust monitor system is designed for the harsh industrial environment such as high temperature (820 ˚C), high pressure (246 kPa), high humid , and
Main Control System
highly electrically charged flue gas. It can measure dust density up to 1 mg/Nm3 as
regulated by the Air Pollution Control Law. It is designed both for standalone and
Purge Air System
for unattended automatic CEMS (continuous emission monitoring). It is easy to be
integrated in DCS (Distributed Control System). DDM-fC is an excellent product
for a new installation or replacing unstable existing dust monitor system. The DDM-f
C is composed with an optical detector, fiber cables, main control system, and purge
air system. The detector uses light scattering method to detect the dust density of
flue gas inside of a stack and has unique design to achieve accurate, reliable, and low
maintenance operation. The microprocessor controlled main control box analyzes
the data from the detector and dispatches alarm signals to the DCS to control the
whole factory or to the dust control system such as bag filters and ESP (Electrostatic
Detector
Precipitator) to avoid accidental air pollution or to control the system to lower the
Optical Fiber Cable
operational cost. The data can be transmitted to DCS and stored and used for data
log and future analysis.
Compliance and CSR
Tanaka Electric Laboratory Light Scattering Detector
The Tanaka Electric Lab. light scattering detector provides
reliable monitoring in the harsh conditions such as highly
Light Source
electrically charged gas, high humidity gas, and variable
velocity of gas. Its dust detection area is 3 dimensional and
Electrode
DDM detection area
Electrode
large; it covers large area inside of a stack and the detector
Optical penetration
has an excellent sensitivity. The light scattering method
uses optical sensor and provides excellent noise resistance.
Its unique detector design and the integrated purge air
system makes the detector almost maintenance free. In adThe integrated Purge air
Optical penetration dition, the installation of the detector is very simple as well.
system keeps the optical
The electrode method detector is theoretically sensitive, but
sensor always clean
Optical Detector
Flow of light emitted the output may be noisy and unreliable. Its detection area is
very small, and the detection may not be accurate. The seninto duct
To main control box
sitivity of the optical penetration method detectors depends
on the product. The detection area is long but narrow. The
Sample Data and Comparison
installation and maintenance are difficult.
Cross Section of the Detection Areas
DDM
Stack/Duct
T.E.L. Light Scattering method vs opacity method
Dust Density
Dust Density
T.E.L. Light Scattering method vs electrode method
DDM
Electrode
Time
The electrode detector could not detect the dust
DDM detected. The signal from the DDM
detector is stable whereas the signal from the
electrode detector is noisy. An electrode method
detector easily picks up noises, and its sensitivity
needs to be set low.
DDM
Optical penetration
Time
DDM dust detector detected the dust the elect rode
method and optical penetration method detectors did
not detect.
The DDM detector and optical penetration
detector sensitivities are resemble. However,
the optical penetration detector’s detection
area is smaller and could not detect the dust
the DDM detector could.
Simple and Easy Installation
Purge Air System Box
It can be installed anywhere and provides
oil and humid free clean air to the detector. The purge air keeps the optical sensor
always clean.
Main Control Box
Detector
The detector body can be easily
installed on stack without any adjustment.
It can be installed anywhere and can be
isolated from high heat and static magnetic
field from stack for maximum accuracy
and reliability. The dust detector sensors
integrated with its control circuit is easy to
be installed and may be cheaper, but these
sensors can be affected by high heat and
static electricity, and may not be reliable
and have shorter life time.
The installation of the DDM-fC is simple
and costs you less. To install the detector you need just one hole on a stack and
minimal work space.
Installing optical penetration dust monitor
systems needs another hole on the other
side of the stack; it is more difficult; you
need more time, work space, efforts, and
money to install it.
Benefits
Simple and Easy Maintenance
Calibrator
The calibrator is
simple and portable. It is easy to be
carried and used
for regular maintenance.
DDM-fC can be calibrated, maintained, or fixed while a
plant is running, and flue gas is still running. It does not
scarify productivity. Most of dust monitor systems needs a
plant to be shut down for maintenance.
Tanaka Electric Laboratory dust monitor systems do not only
help to reduce air pollution and to establish corporative compliance and CSR, but also provide other benefits, such as:
•
•
•
Improve plant’s productivity
Reduce ESP running cost
Improve plant equipment life time
In addition, there are more benefits:
•
•
Reduce initial installation time and cost
Reduce maintenance time and cost
Reliable Continuous Monitoring
Clogged bag filter happened
Clogged bag filter is fixed
Note:
Dust Density
The right graph
is magnified
10x because the
signal is too small
to be visually examined without
magnified.
Time
Abnormal
Time
Normal
Normal
DDM-f C was installed at the exit duct of a cement mill bag filter, continuously
monitored dust, and detected an excess of the dust unable to be visually identified as shown in the right graph. It led to discover a clogged bag filter and a
faulty shaking damper, and fix the problem as shown in the left graph.
Applications/Usages:
•
•
•
•
•
•
•
•
•
FGD of coal/oil electric power plant
Iron works
Paper mill
Waste garbage incinerator
General boiler
Biomass boiler
Cement plant
Sludge incinerator
Aluminum smelting furnace
Control room
1
1
DDM-fC Control box
Heat exchanger
CB
1
2
3
Auxiliary
power
FG
Power
Duct or chimney
supply board
DPM
3
4
+
5
6
3
-
SV3
9
10
Alarm 1 output
(Power supply failure)
11
12
Alarm 2 output
(Lamp failure Motor rotaion failure)
13
14
2M~ 5M
PT1/4 female
Dry pump
SV2
+
-
Pump built-in type
Heater temp,cont,box
SV1
7
8
Auto zero adj.
contact output
Optical fiber cable
(Transmission)
Detector
+
-
3
Optical fiber cable
(Receiving)
1
Cable
2
3
4
Heater 4
2M~ 5M
Heater 5
Gas flow
Thermostat 6
R
Thermostat 7
8
RS-232C
4
FAN
P
Customer construction
Light receiving unit
+
Signal processing board with CPU
Dust density output signal
(DC4~ 20mA)
1
2
2
Motor box
with lamp
2
4
CB2
Alarm 9
CB1
1
AC220V IN
Power supply AC220V,50/60Hz,1.5kVA
F.G
2
3
FG
AC220V
P.0
T
Alarm 3 output
(Pump failure)
AC100V
S.0
10
AC100V OUT 11
5
Specifications
F.G
B
Name
2008 08 20
sega
Checked
2008 08 26
tanaka
C
Detector
Dust density meter composition figure
tanaka
ELECTRIC LABORATORY CO.,LTD.
Title
Revisions
(1) Structure Wall mount outdoor installation type
Data
Drawn
(1) Demention 260 x 125 mm
D
E
Ref. Dwg.No.
FG
Control box (Type : DDM- fC)
A
5
12
F
TE0701-126
G
ファイルNo.
TAN-009
G
(2) Principle 90 degree back ward light scattering method
(2) Weight Approx. 5kg
(3) Light source halogen light
(3) Material Stainless steel (SUS304)
(4) Measurement range 0 – 500 mg/Nm3 relative density output (range is variable)
(4) Cartridge heater is equipped in order to prevent that the detector’s silica glass becomes cloudy
with dew condensation by the moisture in purge air.
(5) External output DC 4-20mA Isolated output RS-232C
(6) Display Digital panel meter of 0 - 100%
(7) Alarm / failure output
(8) Calibration: Zero point adjustment , .Automatic / manual change selection ; Span adjustment
Optical fiber cables are connected to calibrator. Span adjustment with manual operation.
(9) Power supply AC100V±10% (50Hz/ 60Hz), 4A from purge air system box.
(10) Operating temperature -10 ˚C ~ +50 ˚C
(5) Attachment 200 mm x 65 mm rectangle hole is opened and attached to the duct.
Please give the flange of an attachment part as construction side preparation. The packing between flange-detector is standard appending.
(6) Connection of purge air Female screw of PT 1/4 (cheese union)
Purge air system box
(1) Installation restrictions
(11) Demention 500 x 670 x 270mm
This unit is able to use in case of that process gas pressure is of the same grade as atmospheric
pressure or when it is minus pressure
(12) Weight Approx. 45kg
(2) Air flow Approx. 100 l/min
(13) Finish painting color Munsel 5Y7/1 G=40
(3) Alarm / failure output air flow stop alarm by pump failure
Optical fiber cable set
(4) Power supply AC220V±10% (50Hz/ 60Hz), Capacity 1KVA
(1) Diameter of bundle / Length 4 Ø x 4m (standard)
(5) Operating temperature -10 ˚C ~ +50 ˚C
(6) Demention 530 mm x 504 mm x 322mm
(7) Weight Approx. 35kg
Tanaka Electric Laboratory Co., Ltd.
30-10 Kyodo
3-Chome, Setagaya-ku
Tokyo, 156-0052
Japan
Tel: +81-3-3425-2381 Fax: +81-3-3425-2373
URL: http://www.tanaka-e-lab.com
Contact: office@tanaka-e-lab.com
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