2014-7

Probe Type Light Scattering Method
Dust Density Meter(Relative continuous measuring monitor system)

ＤＤＭ－HAL2
Technical introduction
R&D , Manufacture , Sale , MaintenanceTanaka Electric Laboratory Co., Ltd.

1. Why you use dust density meter?
Even in Japan,many companies did not use dust density meter because of no legal duty.
However ,the companies can not produce their product by exhausting poisonous substancein the global economy.
In the present,dust density meter is becoming important monitor of producing process toprotect air environment.
CEMS (Continuous Emission Monitoring System) is requiring continuous dust
monitor in many countries.

Content of proposal:
１） Measurement of dust concentration by the hand analysis method in the law(JISZ8808) is only analyses data in several-time per year. Can you say that it is daily
data ?
２） In case of dust exhausting over air pollution limit level, residents near plants inform to thecity office in any time. The officer requires the evidence to the companies about dust
concentration. So the continuous dust concentration data is important to explain the plantconditions.
３） Preventive maintenance: By using continuous dust concentration trend data,you canmaintenance of EP(electro static precipitator) and bag filter before exhausting a lot of dust to theatmosphere.

２．Kind of dust density meter① Optical penetration typeThe advantage: cheap
The fault: The detection sensitivity is low,
optical axis shifts, and it takes time to maintenance.

② Electrode type・・

The advantage: Easy installation. (installation hole in one place)
The fault: The moisture influences to the dust density output signal.
It is improper in the outlet of EP. This type cannot calibrate of zero & span
adjustment.

③ Light scattering type・・

The advantage: The dust density in the low concentration can be measured.
The correlation coefficient is high.
The fault: Multiplex scattering appears over about 500mg/m3N .
Under this condition,the correlation coefficient will be low.
Our DDM-HAL2 is non-sampling method dust density meter, so easy
installation by one side of duct wall and easy maintenance.
Probe type detector head. No optical axis shifts .
It is possible to calibrate zero & span under plant operation.
Automatically span calibration by CPU.

3． DDM-HAL2 WHOLE PICTURE

Our dust density meter DDM-HAL2 is manufactured as the same quality of the Fuji electric company’s
nuclear instruments in our Tochigi factory . Our design concept is easy maintenance for a long time .
① Very easy installation to the duct by JIS 10k 100A flange.
② Light source is red color LED (625nm). Life cycle is about 30,000 hours.
③ This dust density meter can be used under open air, because of synchronous detection method.
④ Non contamination of dust by peculiar air purge structure and heated probe.

4．Structure of detector head
Patent： Oct/2004
No. ３６０４４９６ (Japan)

Peculiar purge discharge hole
The silica glasses are built in the detector
head. By separate from Optical fiber cables,
there are prevented from contamination by
peculiar air purge system.

Opposed double-layered anddifferent height hole structure
achieves complete air purging.
Detector silica glasses areprevent fromcontamination by peculiar
air purge system.
At very sticky & wet highconcentration flue gas.

Inside of probe: Optical fiber cables and heater

5．Easy installation
The installation on the duct is only one place by standard flange, electrical wiring & air piping also.
The construction cost will be half level of the optical penetration type.

Attach the DDM-HAL2 unit

Electric wiring and air piping

A hole making to the duct, and welding ofprobe attachment flange JIS 10K 100A
(standard size)

Search the installation point.
For example Upstream 2D,Downstream 1D

Adjustment under flue gas flowing (plant operation)

6． Calibration(It is possible to adjust zero & span under plant operating.）
This dust monitor is a relative continuous instrument that by adjusting with hand analysis
method (Isokinetic sampling )data of dust concentration in the chimney or duct.

Solenoid actuator moves shutter from measuring mode to calibration mode by CPU signal, and use calibration filter .
Light source (LED)Transmitting optical fiber

Measuring area

Receiving optical fiber
Span calibration by calibration filter
Beam splitter (trans & receive)
DDM-HAL2

Composition figure

Photo diode7． Comparison of specification with other maker’s dust density meter
Maker / Type Tanaka (Japan) DDM-HAL2Principle
Installation
procedure

Installation
place

Flue gascondition

Non-sampling light scattering◎
・Cut the one hole to the duct.
・Detector attaches to the one place
・ No optical axis shifts
・No electric wiring to the detector head。
・Only one air piping to the detector.
・Installation cost is not costly.

SICK (Germany)OMD41

PCME (UK) DT270

Optical penetration

Electrode×◎・Cut the 2 holes of transmitting
and receiving unit with regarding
light axle.
・It is necessary to re-check thelight axle under high temperatureplant operating.
・2 electric wiring and air piping
to the detector. This is costly.

◎×・Detector head is installed in any placebecause of synchronous detection
method.
・The measurement is possible without
being affected by the sun light.

・The measurement is impossible
by affecting the sun light.

◎△

・Standard：~250℃
・Maintenance free under moisture fluegas condition.
・The flue gas flow changing does not
influence to the dust density signal.

・ Temperature Standard： ~250℃
・ maintenance is necessary undermoisture flue gas condition.
・The flue gas flow changing does
not influence to the dust density
signal.

・Very easy installation because ofone flange attach to the duct.

○・Electrode is not separated by theelectric unit, so it is impossible toinstall at the high temperatureducts.

△・ Temperature Standard： ~250℃
・Cannot measure well undermoisture flue gas condition.
・The flue gas flow changing does
influences to the dust density
signal.

Type

DDM-HAL2OMD 41

DT 270Calibration
method◎××・ Calibration is possible under plant

operation.
・ Zero check and adjust by manual.
・ Auto span calibration mode by CPU isequipped.

Consumables○・LED lamp assy.
Easy changeable of LED mounted PCB.

Maintenance◎・ No optical axis shifts
・ Opposed double-layered and different
height hole structure achieves complete airpurging

Runningcost
Total cost○・Instrument air required.

◎・There is an advantage as a whole cost
about equipment procurement cost +installation expense + calibration cost.
・Maintenance cost is not costly.

・ It is impossible to zero
calibrate under plant operation.

・ It is impossible to calibrate
including electrode andelectronics circuit.

△・LED lamp and blower are special
made by maker.

◎・No consumables.

○・The gap of a small optical axis iscorrected by an auto collimator,
and it is not small gap ,the opticalaxis suiting work is required any
more by two people.

◎・Maintenance free.
(It is not sure)△・ Special made LED lamp andblower are costly than general
purpose parts.
△
・A whole cost is high because theconstruction expense is very high .

◎・Nothing.

◎・A whole cost is very low because
the construction expense is alsocheap .
・However the cost of adjustment
with hand analysis data in several
times per year is costly.

8． Measurement data (tendency management)

Unusual state

Since the dust density meter was installed inbag filter exit duct, it became clear thatdirections are swaying greatly. The filter
was got blocked and it was proved that thedefect of the damper was the cause.

Data after bag filter repair

When repair of the bag filter cloth and thedamper was performed, change of directions
decreased. (The sensitivity of dust density
meter is the same as before.) The abovementioned graph extends a vertical axis to 010%, and is looking at it.

As a result of dust density meter directions performing operation
management of a dust-collecting machine(bag filter & EP), a lot of dust
discharge to environment was able to be prevented in advance.

9. Installation at Iron furnace plantStandard JIS 10K 100A flange
Detector head installed at duct open end.
The measurement is possible without being affected by the sun light.

10. Installation at Electric power plant

Coal electric power EP outlet

Install at duct top flange

11. Installation at Paper mill

Test at under -20℃ atmosphere

Test by isokinetic sampling (JISZ8808)

12. Customer list (DDM-2001,DDM-HAL2) 1/2
Mitsubishi material Corp. Yokoze

Sludge incinerator Jyounanjima Tokyo

Mitsubishi material Corp. Kyusyu

Sumitomo osaka cement Co. Kochi

Cyugoku electric power Co. Ube

Iwaki daio paper Co. Iwaki

Onoda cement Co. Tsukumi

Sumitomo osaka cement Co. Tochigi

Ube kosan Co. Kanda,Kyusyu

Sumitomo metal industries Co. Kokura

Sumitomo metal industries Co. Kashima

Hachinohe cement Co. Hachinohe

Aso cement Co. Kanda,Kyusyu

Okinawa electric power Co. Kin

Ryukyu cement Co. Okinawa

Oji paper Co. KasugaiChichibu onoda cement Co. Chichibu

Nippon Seiko Co. Nakase

Mitsubishi material Corp. Kurosaki

Chichibu taiheiyo cement Co. Chichibu

Myojyo cement Co. Itoigawa

Mitsubishi material Corp. Kyusyu

Dai showa peper making mfg.Co. Fuji

Kyoei steel Co. Yamaguchi

Taiheiyo cement Co. Chichibu

Asahi glass Co. Keihin

Asahi glass Co. Sagami

Mitsui mining/Mitsui mike
manufactureCo. Omuta

Nippon steel Co. Kimitsu
Nissshin steel Co. Kure

Mitsubishi material Corp. Naojima

12. Customer list 2/2
Industrial garbage incinerator KagoshimaHokkaido electric power Co. Naie plant

Nikko metal Co. Saganoseki

Iwaki daio paper Co./Birla cement works chittorgarh

Cyubu electric power Co, Atsumi plant

Tokuyama Corp. (soda) Tokuyama

Kyusyu electric power Co. karita plant

Bridgestone Corp. Hikone

Cyubu electric power Co, Chita plant

Tokuyama Corp.(cement) Nanyo

JFE Bars & Shapes Corp. Sendai

Shinryo alumi recycle Co. Oyama

Taiheiyo cement Co. Tosa plant

Taiheiyo cement Co. Saitama plant

Taiheiyo cement Co. Saiki plantJ-power Co. Matsuura power plant

Hokkai steel Co./Nippon steel MuroranKyoei steel Co. Nagoya

Ube kosan Co. Ube IPP electric plant

Eco energy Japan Co. Chiba

Cyubu electric power Co,Nishi nagoya plant

JFE steel Co. Chiba

Hokuriku electric power Co,Nanaooota plant

Oji paper Co. Kasugai/MHI Yokohama

Nippon paper Co. Ishinomaki ,Iwakuni plant

Kobe steel Co. Kakogawa

Yoshino Gypsum Co. Saitama plant

DC Co. Kawasaki cement plant

Asahi carbon Co. Nigata plantKansai thermo chemical Co, Kakogawa

EGAT MAE MOH #12 FGD

220 units in June.2014

MHI Yokohama

Nippon steel sumitomo Co.