Coal-Dust Consumption Control in Burners of the Boiler Equippedly the Supply System Rated to High Concentration of Coal Dust

1997 ◽  
Vol 28 (4-6) ◽  
pp. 365-370
Author(s):  
L. A. Kesova ◽  
Hoang Tien Zung ◽  
Yu. N. Pobirovskii
Keyword(s):  
Coal Dust ◽  
Supply System ◽  
High Concentration ◽  
Consumption Control

The Research and Application of Efficient Dust Control System for Whole-Rock Comprehensive Mechanization Driving Face

2014 ◽  
Vol 955-959 ◽  
pp. 1020-1023 ◽  
Author(s):  
Wen Nie ◽  
Nai Guo Wang ◽  
Wei Min Cheng ◽  
You Ying Ma ◽  
Ya Ru Sun
Keyword(s):  
Control System ◽  
Short Distance ◽  
Coal Dust ◽  
Dust Control ◽  
Respirable Dust ◽  
High Concentration ◽  
Air Curtain ◽  
Random Movement ◽  
Comprehensive Mechanization ◽  
Purification System

To prevent high concentration dust on whole-rock comprehensive mechanization driving face efficiently, air curtain dust drawing and purification system were developed. This system is consisted of two sections, air curtain dust drawing device and dust purification system device. It determines optimized parameters of air curtain drawing dust device by combining site actual conditions and has realized short distance 3d dust absorbing and random movement. After using the efficient dust control system for whole-rock comprehensive mechanization driving face on south main return way,the average dust-laying rate of total coal dust and respirable dust in manually operation department, respectively reach 91.6% and 90.5%.It shows that this system is a efficient means for dust control of whole-rock comprehensive mechanization driving face.

Numerical Simulation Research on Gas-Dust Flow Field of Forced-Exhausted Hybrid Ventilation in Whole Rock Mechanized Heading Face

2013 ◽  
Vol 336-338 ◽  
pp. 873-879 ◽  
Author(s):  
Gang Zhou ◽  
De Ming Wang ◽  
Wei Min Cheng ◽  
Sen Cao
Keyword(s):  
Fluid Model ◽  
Coal Dust ◽  
Engineering Application ◽  
Simple Algorithm ◽  
Dust Concentration ◽  
Dust Control ◽  
High Concentration ◽  
Two Phase ◽  
Collocated Grid ◽  
Two Fluid Model

Euler-Euler two-fluid model was used to construct control equations of gas-solid two-phase flow, based on SIMPLE algorithm of collocated grid and FLUENT software, the pressure distribution of air-flowing field and dust field diffusion in fully-mechanized excavation face with different air-draft volume were simulated. The results show that with the increase of exhausted dust ability, diffusion intensity of producing dust pollution in driving head constantly decreases. Compared to air-draft volume of 320m3/min, when it is 600m3/min, the average dust concentration at the driver and whole section positions respectively decrease 51.28% and 56.51%, and high-concentration dust diffusion distance of the other workers position section decrease from 13.6m to 8.5m. Engineering Application indicates that the measured dust concentration is basically anastomosed with simulation result. When air-draft volume of dedusting fan is 600m3/min and dust control system with air curtain formed by forced fan drum is used, the dedusting rates of total coal dust and respirable dust on spot are respectively 95.1% and 96.1%, which achieves a great dedusting effect.

scholarly journals Study of the health effects of coal mining on coal mine workers of Baluchistan

2017 ◽  
Vol 5 (1) ◽  
pp. 7-10
Author(s):  
Salah Uddin Azad
Keyword(s):  
Coal Mine ◽  
Coal Dust ◽  
Secondary Data ◽  
Primary Data ◽  
Chronic Obstructive ◽  
Health Issues ◽  
Coal Field ◽  
High Concentration ◽  
Respiratory Illnesses ◽  
Mine Workers

Background: The data on coal mine workers was collected from May 2009 to April 2010.Objective:To study the health issues of coal mine workers. Methods: Two types of data were collected. Primary data was obtained through topographic survey and questionnaire while Secondary data about the health   issues, medical facilities and other allied facilities of coal mine workers of Baluchistan (pakistan) were collected from; Mine& Mineral department of Quetta, hospitals and medicals facilities in coal mine fields. Three mine fields i.e. Mach, So-range-Degari, and Chamalong coal fields were selected and further   subdivided as M1,M2,andM3 at Mach coal field, SD1, SD2 and SD3 at So-range-Degari and C1, C2 and C3 at Chamalong coal field. Results: The average emission of Methane (CH4), Carbon monoxide (CO), and Oxygen (O2) in coal mine fields was 11.8m3/ton, 36ppm and 14% respectively which, exceeded the permissible limits of 1-10m3/ton, 30ppm and 18%. The concentration of coal dust (Carbon and Quartz) was 4-5mg/m3 and 0.35mg/m3 respectively as against the threshold limits of 2mg/m3  and 0.05-0.1 mg/m3  for 8 hours daily and 40 hours/week. Due to high concentration of coal dust the miners experienced headache, irritation in throat, nose  and eyes, drowsiness, shortness  of breath, nausea, pneumoconiosis, tuberculosis, chronic obstructive bronchitis, heart problems, and other respiratory illnesses. The coal  water and slurry was disposed off in an unconfined area causing contamination of drinking water leading to symptoms of indigestion and diarrhea to the miners. Conclusion: Government of Baluchistan and coal mine owners should take concrete steps to improve the adverse health impacts of coal miners. 

scholarly journals PROSPECTS FOR THE DEVELOPMENT OF CONSUMER COOPERATION IN AGRICULTURE IN THE REGION

2020 ◽  
pp. 47-53
Author(s):  
V.V. Vorobyovа ◽  
S.P. Vorobyov
Keyword(s):  
Food Supply ◽  
Supply System ◽  
Main Trend ◽  
Small Scale ◽  
Total Revenue ◽  
High Concentration ◽  
Large Group ◽  
Current Trends ◽  
Consumer Cooperatives

The article aims to identify the problems of development of agricultural consumer cooperatives in the Altai territory in the food supply system. The stages of changes in the number of consumer cooperatives in Russia are revealed: from 2006 to 2010 — an increase in the number, from 2011 to the present-a decrease in the number with an increase in revenue per organization, a high concentration of income in a large group of cooperatives is shown — 10.0% of cooperatives received 72.11% of the total revenue of all organizations. The paper assesses the current trends of small-scale farming in Russia. On the example of the Altai territory, the main trend of the development of households: in this category, producers reduced the number of livestock, poultry, increasing the number of bee-families; households remain the main producers of potatoes, vegetables, wool, honey commodity, milk and meat cattle, poultry; the marketability of production tends to increase, but remains low. There is practically no reserve for growth in sales volumes due to the development of production and sales cooperation, since no more than five cooperatives actually operate.

Cytomembrane Preservation in Tissue Dehydrated Only With Glutaraldehyde and Epon 812 Resin

1973 ◽  
Vol 31 ◽  
pp. 320-321
Author(s):  
Daniel C. Pease
Keyword(s):  
Diffraction Pattern ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Unpublished Study ◽  
X Ray ◽  
Sectioned Material

A previous study demonstrated that tissue could be successfully infiltrated with 50% glutaraldehyde, and then subsequently polymerized with urea to create an embedment which retained cytomembrane lipids in sectioned material. As a result, the 180-190 Å periodicity characteristic of fresh, mammalian myelin was preserved in sections, as was a brilliant birefringence, and the capacity to bind OsO4 vapor in the hydrophobic bilayers. An associated (unpublished) study, carried out in co-operation with Drs. C.K. Akers and D.F. Parsons, demonstrated that the high concentration of glutaraldehyde (and urea) did not significantly alter the X-ray diffraction pattern of aldehyde-fixed, myelin. Thus, by itself, 50% glutaraldehyde has little effect upon cytomembrane systems and can be used with confidence for the first stages of dehydration.

Effects of carbamylcholine on chick embryo aggregate retina cell cultures

1988 ◽  
Vol 46 ◽  
pp. 350-351
Author(s):  
Glenn M. Cohen ◽  
Radharaman Ray
Keyword(s):  
Cell Cultures ◽  
Single Cells ◽  
Retinal Cell ◽  
Cell Aggregates ◽  
High Concentration ◽  
In Ovo ◽  
Sterile Culture ◽  
Retinal Tissue ◽  
Synaptic Junctions ◽  
And Control

Retinal,cell aggregates develop in culture in a pattern similar to the in ovo retina, forming neurites first and then synapses. In the present study, we continuously exposed chick retinal cell aggregates to a high concentration (1 mM) of carbamylcholine (carbachol), an acetylcholine (ACh) analog that resists hydrolysis by acetylcholinesterase (AChE). This situation is similar to organophosphorus anticholinesterase poisoning in which the ACh level is elevated at synaptic junctions due to inhibition of AChE, Our objective was to determine whether continuous carbachol exposure either damaged cholino- ceptive neurites, cell bodies, and synaptic elements of the aggregates or influenced (hastened or retarded) their development.The retinal tissue was isolated aseptically from 11 day embryonic White Leghorn chicks and then enzymatically (trypsin) and mechanically (trituration) dissociated into single cells. After washing the cells by repeated suspension and low (about 200 x G) centrifugation twice, aggregate cell cultures (about l0 cells/culture) were initiated in 1.5 ml medium (BME, GIBCO) in 35 mm sterile culture dishes and maintained as experimental (containing 10-3 M carbachol) and control specimens.

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

Tem analysis of multiple-energy arsenic implanted and Rta'd silicon

1987 ◽  
Vol 45 ◽  
pp. 246-247
Author(s):  
R.A. Herring
Keyword(s):  
Device Fabrication ◽  
High Concentration ◽  
Tem Analysis ◽  
Defect Clusters ◽  
High Fluences ◽  
Small Defect ◽  
Before And After ◽  
The Matrix ◽  
The Difference ◽  
Factor Type

Rapid thermal annealing (RTA) of ion-implanted Si is important for device fabrication. The defect structures of 2.5, 4.0, and 6.0 MeV As-implanted silicon irradiated to fluences of 2E14, 4E14, and 6E14, respectively, have been analyzed by electron diffraction both before and after RTA at 1100°C for 10 seconds. At such high fluences and energies the implanted As ions change the Si from crystalline to amorphous. Three distinct amorphous regions emerge due to the three implantation energies used (Fig. 1). The amorphous regions are separated from each other by crystalline Si (marked L1, L2, and L3 in Fig. 1) which contains a high concentration of small defect clusters. The small defect clusters were similar to what had been determined earlier as being amorphous zones since their contrast was principally of the structure-factor type that arises due to the difference in extinction distance between the matrix and damage regions.

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