scholarly journals Investigation on Pollution Control Device (PCD) In Foundry Industry to Reduce Environmental Chemicals

2021 ◽  
Author(s):  
Krishnaraj Ramaswamy ◽  
Leta Tesfaye Jule ◽  
Nagaprasad Nagaraj ◽  
Kumaran subramanian ◽  
Shanmugam Ramaswamy ◽  
...  
Keyword(s):  
Pollution Control ◽  
Induction Furnace ◽  
Control Device ◽  
Environmental Chemicals ◽  
Contamination Control ◽  
Foundry Industry ◽  
Cartridge Filter ◽  
Control Devices ◽  
Construction Operation ◽  
Different Parts

Abstract Right from the olden days, many products have been made according to foundry practices in order to generate prosperity in the societies in which they operate, while reaping these types of benefits through the operation of foundries. It is alarming that the emissions released by foundries affect human health. Therefore, foundries installed Pollution Control devices (PCDs), in accordance with this development; researchers examined the effectiveness of these PCDs in controlling emissions from foundries in different parts of the world. The emission control obtained by installing these PCDs is explained in this article based on the data gathered from the survey. The result of the study indicated that the cartridge filter built into the induction furnace achieves the best efficiency in controlling contamination from foundries. Interestingly, the operation of the cartridge filter has yet to be documented. Therefore, the construction, operation, the performance of the cartridge filter, and its efficiency in achieving contamination control in foundries are described. The article ends by emphasizing the need to conduct surveys in foundries in which a cartridge filter is installed. The results of this study will provide useful information on the use of cartridge filters in induction furnaces to reduce foundry emissions.

Experimental Study of the Effects of Fuel Quality and Pollution Control Devices on SOF and PAHs Emissions in PM for HD Diesel Engine

2012 ◽  
Vol 610-613 ◽  
pp. 1764-1769
Author(s):  
Wei Li ◽  
Hong Yu Lu ◽  
Hong Song Guo
Keyword(s):  
Diesel Engine ◽  
Pollution Control ◽  
Catalytic Reduction ◽  
Soxhlet Extraction ◽  
Control Device ◽  
Particulate Filter ◽  
Fuel Quality ◽  
Pahs Concentration ◽  
Control Devices ◽  
Gas Chromatography Mass Spectroscopy

The effects of fuel quality and pollution control devices on SOF and PAHs emissions in particle matter (PM) for China V heavy-duty (HD) diesel engine fueled with China III, China IV and China V diesel were studied by using soxhlet extraction technique and Gas Chromatography-Mass Spectroscopy (GC-MS) technique. Two engines used were equipped with Diesel Oxidation Convert (DOC)+Diesel Particulate Filter (DPF) and Select Catalytic Reduction (SCR) individually. It is found that the SOF mass fraction in PM rises remarkably and total PAHs concentration declines obviously with the improvement of diesel fuel from China III to China V. However, the 16 components of PAHs distribute similarly for three quality of diesel, the concentrationes of Flu、PA、Ant、FL、Pyr、BaA、CHR reduce obviously, especially Pyr decrease by 95.8%. Moreover, the pollution control device has important effects on SOF and PAHs emissions.

Active Helmholtz Resonator With Positive Real Impedance

2006 ◽  
Vol 129 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Jing Yuan
Keyword(s):  
Noise Control ◽  
Helmholtz Resonator ◽  
Control Device ◽  
Positive Real ◽  
Noise Field ◽  
Strictly Positive Real ◽  
Control Devices ◽  
Passive Noise ◽  
Active Resonator ◽  
Electronic Resonance

The impedance of a passive noise control device is strictly positive real, if the device is installed in noise fields with weak mean flows. Passive noise control devices are, therefore, more reliable than active ones. Active control may be applied to a Helmholtz resonator to introduce electronic resonance. It will affect the impedance Zact of the resonator. A controller may be designed such that (a) Zact is small and resistive at some tunable frequencies; and (b) Re{Zact}⩾0 in the entire frequency range of interest. If criterion (a) is satisfied, the active resonator can suppress duct noise at tunable frequencies. It is difficult to design a controller to satisfy criterion (b) because parameters of the controller depend on acoustic parameters of the noise field. A new method is proposed here to design an active controller to meet both criteria simultaneously. The satisfaction of criterion (b) implies a positive real Zact and a robust active resonator with respect to parameter variation in the noise field. Experimental results are presented to verify the performance of the active resonator.

Coeffect of Air Pollution Control Devices on Trace Element Emissions in an Ultralow Emission Coal-Fired Power Plant

2018 ◽  
Vol 33 (1) ◽  
pp. 248-256 ◽  
Author(s):  
Jiawei Wang ◽  
Yongsheng Zhang ◽  
Zhao Liu ◽  
Yongzheng Gu ◽  
Pauline Norris ◽  
...  
Keyword(s):  
Air Pollution ◽  
Power Plant ◽  
Trace Element ◽  
Pollution Control ◽  
Air Pollution Control ◽  
Control Devices ◽  
Air Pollution Control Devices

Mercury co-beneficial capture in air pollution control devices of coal-fired power plants

2017 ◽  
Vol 170 ◽  
pp. 48-53 ◽  
Author(s):  
Deepak Pudasainee ◽  
Yong-Chil Seo ◽  
Jin-Ho Sung ◽  
Ha-Na Jang ◽  
Rajender Gupta
Keyword(s):  
Air Pollution ◽  
Pollution Control ◽  
Power Plants ◽  
Air Pollution Control ◽  
Control Devices ◽  
Air Pollution Control Devices

Investigation of Quantum Dot Solar Cell Device Performance

2013 ◽  
Vol 1551 ◽  
pp. 137-142
Author(s):  
Neil S. Beattie ◽  
Guillaume Zoppi ◽  
Ian Farrer ◽  
Patrick See ◽  
Robert W. Miles ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Quantum Dot ◽  
Band Gap ◽  
Control Device ◽  
Open Circuit ◽  
Device Performance ◽  
Intermediate Band ◽  
Control Devices

ABSTRACTThe device performance of GaAs p-i-n solar cells containing stacked layers of self-assembled InAs quantum dots is investigated. The solar cells demonstrate enhanced external quantum efficiency below the GaAs band gap relative to a control device without quantum dots. This is attributed to the capture of sub-band gap photons by the quantum dots. Analysis of the current density versus voltage characteristic for the quantum dot solar cell reveals a decrease in the series resistance as the device area is reduce from 0.16 cm2 to 0.01 cm2. This is effect is not observed in control devices and is quantum dot related. Furthermore, low temperature measurements of the open circuit voltage for both quantum dot and control devices provide experimental verification of the conditions required to realise an intermediate band gap solar cell.

scholarly journals Novel Materials for Combined Nitrogen Dioxide and Formaldehyde Pollution Control under Ambient Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1040
Author(s):  
Hugo S. Russell ◽  
James Bonomaully ◽  
Rossana Bossi ◽  
Magdalena E. G. Hofmann ◽  
Hasse C. Knap ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Nitrogen Dioxide ◽  
Pollution Control ◽  
Carbon Adsorbent ◽  
Proton Transfer Reaction ◽  
Control Device ◽  
Urban Environments ◽  
Metal Catalyst ◽  
Ambient Conditions ◽  
Pollution Exposure

Formaldehyde (HCHO) and nitrogen dioxide (NO2) often co-exist in urban environments at levels that are hazardous to health. There is a demand for a solution to the problem of their combined removal. In this paper, we investigate catalysts, adsorbents and composites for their removal efficiency (RE) toward HCHO and NO2, in the context of creating a pollution control device (PCD). Proton-transfer-reaction mass spectrometry and cavity ring-down spectrometry are used to measure HCHO, and chemiluminescence and absorbance-based monitors for NO2. Commercially available and lab-synthesized materials are tested under relevant conditions. None of the commercial adsorbents are effective for HCHO removal, whereas two metal oxide-based catalysts are highly effective, with REs of 81 ± 4% and 82 ± 1%, an improvement on previous materials tested under similar conditions. The best performing material for combined removal is a novel composite consisting of a noble metal catalyst supported on a metal oxide, combined with a treated active carbon adsorbent. The composite is theorized to work synergistically to physisorb and oxidize HCHO and chemisorb NO2. It has an HCHO RE of 72 ± 2% and an NO2 RE of 96 ± 2%. This material has potential as the active component in PCDs used to reduce personal pollution exposure.

A Low Cost Rejuvenation of Old G.E. and Picker X-Ray Generators

1983 ◽  
Vol 27 ◽  
pp. 293-297
Author(s):  
G. Raykhtsaum ◽  
P. Georgopoulos
Keyword(s):  
Solid State ◽  
High Voltage ◽  
High Performance ◽  
Low Cost ◽  
The United States ◽  
Control Device ◽  
State Control ◽  
X Ray ◽  
Tube Current ◽  
Control Devices

General Electric (G.E.) and Picker generators are currently installed in many research laboratories all over the United States. These units are old and do not satisfy the modern requirements for X-ray generators. Instabilities of high voltage and tube current complicate the experiment. To maintain G.E. and Picker generators is becoming more and more expensive due to the high cost of vacuum tubes and replacement parts. To replace old generators with new high performance commercial units can cost even more and requires additional adaptations. In the present paper another alternative is proposed, which assumes the replacement of vacuum tube mA and KV controls with solid state circuits using the old G.E. or Picker high voltage transformers. This alternative allows rejuvenation of old generators without difficulties of reinstallation and does not require adaptations to the existing experimental X-ray equipment. The combination of old high voltage transformers with modern solid state control devices provides high performance at low cost. For this purpose the control device was designed and is described below.

Multi-Manual Emergency Escaping System of Air Control Bus Door Based on Driver and Passenger Manipulation

2012 ◽  
Vol 588-589 ◽  
pp. 1476-1479
Author(s):  
Zhi Wei Qi ◽  
Ting Jun Wang ◽  
Zhao Ma ◽  
Xiao Chen ◽  
Bi Jun Shen
Keyword(s):  
Control Device ◽  
Mutual Interference ◽  
The State ◽  
Manual Control ◽  
Series Connection ◽  
Bus Driver ◽  
In Series ◽  
Control Devices ◽  
Working Performance ◽  
Air Control

For controlling emergency escaping by a bus driver in the case of air control door cannot be opened normally, the paper presented a multi-manual emergency escaping system of pneumatic bus door. Bus driver and passenger can control doors expediently. The pneumatic circuit of the system and its overall arrangement is discussed. A manual control device with special valve core structure is designed. The working performance of the manual shift directional valve is analyzed. The results indicate that driver and passengers can control the bus doors under the state of abnormal condition via manual control devices in series connection rapidly. Driver and passengers control is without mutual interference. Manual shift directional valves are convenient, reliable and fast.

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