scholarly journals Mass flow and particle size monitoring of pulverised fuel vertical spindle mills

2016 ◽  
Vol 37 (2) ◽  
pp. 175-197 ◽  
Author(s):  
Hamresin Archary ◽  
Walter Schmitz ◽  
Louis Jestin
Keyword(s):  
Particle Size ◽  
Mass Flow ◽  
Good Precision ◽  
Monitoring Tool ◽  
Performance Factors ◽  
Flow Monitoring ◽  
Power Stations ◽  
Plant Environment ◽  
On Line ◽  
Set Up

Abstract The first step towards condition based maintenance of the milling plant is the implementation of online condition monitoring of the mill. The following paper presents and analyses methods of monitoring the key performance factors of a vertical spindle mill that is suited for implementation on older power stations, i.e. the quantity (mass flow rate) and quality (particle fineness) of the pulverised fuel produced by the mill. It is shown herein that the mill throughput can be monitored on-line using a simple mill energy balance that successfully predicts the coal throughput within 2.33% as compared to a calibrated coal feeder. A sensitivity analysis reveals that the coal moisture is a critical measurement for this method to be adopted as an on-line mass flow monitoring tool. A laser based particle size analyser tool was tested for use in the power plant environment as an online monitoring solution to measure pulverised fuel fineness. It was revealed that several factors around the set-up and operation of the instrument have an influence on the perceived results. Although the instrument showed good precision and repeatability of results, these factors must be taken into account in order to improve the accuracy of the reported results before the instrument can be commissioned as an on-line monitoring solution.

Study on the cleaning effect of atomized droplets on the aero-engine

2022 ◽  
pp. 095440622110653
Author(s):  
Xudong Shi ◽  
Jinjian Huo ◽  
Jianwei Hu ◽  
Xin Lu
Keyword(s):  
Particle Size ◽  
Mass Flow ◽  
Process Parameters ◽  
Engine Performance ◽  
Cleaning Process ◽  
Discrete Phase Model ◽  
Particle Size Range ◽  
Exhaust Temperature ◽  
Aero Engine ◽  
On Line

The aero-engine will produce fouling during operation, which will affect the engine performance. On-line cleaning can effectively remove fouling, in order to solve the problem of the poor cleaning effect for aero-engine on-wing cleaning and carry out numerical simulation of the on-line cleaning process. The discrete phase model is used to optimize the particle size and mass flow of the cleaning fluid. The erosion rate and vorticity of the droplets on the blade surface are used as the effect target to simulate and optimize the cleaning process parameters to obtain a better particle size range and the ratio of cleaning fluid to air mass flow. Through the evaluation of the cleaning process parameters of the aero-engine on-wing cleaning test and the analysis of the engine exhaust temperature margin (EGTM) data, it is concluded that the cleaning effect is improved by nearly 40%.

Real-Time On-Line Monitoring of Pulverized Coal at Power Stations

2003 ◽  
Author(s):  
Xiaoshu Cai ◽  
Junfeng Li ◽  
Zhijun Zhao ◽  
Xin Ouyang ◽  
Chunyang Huang
Keyword(s):  
Particle Size ◽  
Real Time ◽  
Pulverized Coal ◽  
Utility Boiler ◽  
Power Stations ◽  
Utility Boilers ◽  
On Line ◽  
Measure Particle Size ◽  
One Year ◽  
Light Fluctuation

The principle of light fluctuation is presented. Based on this method, a novel system for on-line real time measuring pulverized coal was developed by authors. This system may be used in both the direct firing pulverizing system and the indirect firing pulverizing system. The results of over-one-year monitoring in a 300 MW utility boiler and many measurements in utility boilers with the capacities from 300MW to 600 MW show that the system can reliably measure particle size, concentration and velocity of pulverized coal.

Respirometry for determination of the influents SS-concentration

1996 ◽  
Vol 33 (1) ◽  
pp. 311-323 ◽  
Author(s):  
A. Witteborg ◽  
A. van der Last ◽  
R. Hamming ◽  
I. Hemmers
Keyword(s):  
Experimental Design ◽  
Activated Sludge ◽  
Substrate Concentration ◽  
Full Scale ◽  
Activated Sludge Process ◽  
Respiration Rates ◽  
On Line ◽  
Large Measurement ◽  
Set Up

A method is presented for determining influent readily biodegradable substrate concentration (SS). The method is based on three different respiration rates, which can be measured with a continuous respiration meter which is operated in a cyclic way. Within the respiration meter nitrification is inhibited through the addition of ATU. Simulations were used to develop the respirometry set-up and decide upon the experimental design. The method was tested as part of a large measurement programme executed at a full-scale plant. The proposed respirometry set-up has been shown to be suitable for a semi-on-line determination of an influent SS which is fully based on the IAWQ #1 vision of the activated sludge process. The YH and the KS play a major role in the principle, and should be measured directly from the process.

WWW.TELD.NET: Online Courseware Engine for Teaching by Examples and Learning by Doing

2001 ◽  
Vol 29 (3) ◽  
pp. 219-235 ◽  
Author(s):  
G. Q. Huang ◽  
B. Shen ◽  
K. L. Mak
Keyword(s):  
Teaching And Learning ◽  
Virtual Classroom ◽  
Learning By Doing ◽  
General Purpose ◽  
Project Based Learning ◽  
Course Materials ◽  
Summative Assessments ◽  
On Line ◽  
Set Up ◽  
Electronic Delivery

TELD stands for “Teaching by Examples and Learning by Doing.” It is an on-line courseware engine over the World Wide Web. There are four folds of meanings in TELD. First, TELD represents a teaching and learning method that unifies a number of contemporary methods such as Problem-Based Learning (PBL) in medical education, Project-Based Learning (PBL) in engineering education, and Case Method (CM) in business education. Second, TELD serves as a Web server for hosting teaching and learning materials especially based on the TELD method. A variety of on-line facilities are provided for editing and uploading course materials such as syllabus, schedule, curriculum, examples of case study, exercises of mini-project, formative and summative assessments, etc. Third, TELD is a courseware search engine where educators are able to register their course materials and search for materials suitable for a particular course. In contrast with general-purpose search engines, TELD is set up for the special purpose of education. Therefore, the time and efforts spent on surfing are expected to be reduced dramatically. Finally, TELD is an on-line virtual classroom for electronic delivery of electronic curriculum materials. In addition to providing the lecture notes, TELD not only provides discussion questions for conducting in-class discussions and homework as formative assessment but also provides facilities for students to plan and submit their group work. This article presents an overview of the TELD courseware engine together with its background and underlying philosophy.

scholarly journals Optimum three-point linkage set up for improving the quality of soil spectra and the accuracy of soil phosphorus measured using an on-line visible and near infrared sensor

2009 ◽  
Vol 103 (1) ◽  
pp. 144-152 ◽  
Author(s):  
A.M. Mouazen ◽  
M.R. Maleki ◽  
L. Cockx ◽  
M. Van Meirvenne ◽  
L.H.J. Van Holm ◽  
...  
Keyword(s):  
Near Infrared ◽  
Soil Phosphorus ◽  
Infrared Sensor ◽  
On Line ◽  
Set Up

Minimizing Segregation in Bunkers

1973 ◽  
Vol 95 (1) ◽  
pp. 81-85 ◽  
Author(s):  
K. Clague ◽  
H. Wright
Keyword(s):  
Particle Size ◽  
Flow Regime ◽  
Mass Flow ◽  
Raw Materials ◽  
Model Tests ◽  
Material Density ◽  
Filling Method ◽  
Density Results

Bunkers used in steelworks sinter plants and other applications need to be designed and operated so that the feed emerging is unsegregated. A series of model tests has been carried out to discover which bunker shape, flow regime, and filling method give the least segregation for raw materials of different particle size and density. Results are compared with results from larger bunkers. The main conclusions are that an evenly-filled wedge-shaped mass-flow bunker is best at preventing segregation and that material density has little effect.

Portal imaging for evaluation of daily on-line set up errors and off-line organ motion for radiotherapy of carcinoma of prostate

1998 ◽  
Vol 42 (1) ◽  
pp. 293
Author(s):  
H. Alasti ◽  
C. Catton ◽  
N. Middlemiss ◽  
G. Ottewell ◽  
L. Green ◽  
...  
Keyword(s):  
Organ Motion ◽  
Portal Imaging ◽  
On Line ◽  
Set Up ◽  
Line Organ
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