New learnings and strategies for meeting future recovery boiler particulate emission limits with existing electrostatic precipitators

TAPPI Journal ◽  
2021 ◽  
Vol 20 (6) ◽  
pp. 405-412
Author(s):  
IVAN SRETENOVIC
Keyword(s):  
Electrostatic Precipitator ◽  
Practical Experience ◽  
The United States ◽  
Operating Conditions ◽  
Particulate Emission ◽  
Process Simulations ◽  
Electrostatic Precipitators ◽  
Recovery Boiler ◽  
Emission Limits ◽  
Efficiency And Reliability

It is foreseeable that recovery boiler particulate emission limits in the United States and Canada will continue to get more stringent with time. Because of this, continued improvement of emission control equipment, as well as a better understanding of how operating parameters affect performance, are necessary. Although electrostatic precipitators (ESPs) are often viewed as a mature technology, many improvements in ESP technology continue to be developed. In recent years, academic efforts have improved the understanding of recovery boiler operating conditions on ESP performance. Additionally, advancements in materials, power supplies, and design continue to improve the efficiency and reliability of ESPs. This paper discusses how recovery boiler and electrostatic precipitator (ESP) operating factors affect ESP performance based on process simulations and practical experience, and how these learnings can be implemented to improve future operation of existing ESPs.

scholarly journals Conversion of an existing electrostatic precipitator casing to Pulse Jet Fabric filter in fossil power plants

DYNA ◽  
2016 ◽  
Vol 83 (195) ◽  
pp. 189-197 ◽  
Author(s):  
Francisco Manzano-Agugliaro ◽  
Javier Carrillo-Valle
Keyword(s):  
Power Generation ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Combustion Process ◽  
Performance Expectations ◽  
Particulate Emission ◽  
Fabric Filter ◽  
Alternative Means ◽  
Emission Limits ◽  
Pulse Jet

The combustion process of power generation plants originates particulates. There are different technologies to collecting particulate such as electrostatic precipitators (ESPs) or fabric filters. Currently, these ESPs take 25 or 35 years in service and if the performance expectations of their Plants are positives, improving investments required which can adapt to the new particulate emission limits becoming more stringent. This paper analyzes an alternative means great savings in investment costs; Conversion of the existing ESP casing to a Pulse Jet fabric filter. This study also presents a real case, implementing this conversion with good results in unit of 660 MW power plants of Italy.

Factors affecting particulate removal efficiency of kraft recovery boiler electrostatic precipitators: a technical review

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 273-283 ◽  
Author(s):  
Ezzat Jaroudi ◽  
Ivan Sretenovic ◽  
Greg Evans ◽  
Honghi Tran
Keyword(s):  
Particle Size ◽  
Sodium Chloride ◽  
Collection Efficiency ◽  
Operating Conditions ◽  
Pulp Mills ◽  
Factors Affecting ◽  
Recovery Boilers ◽  
Electrostatic Precipitators ◽  
Recovery Boiler ◽  
Particulate Removal

Electrostatic precipitators (ESPs) are used in most pulp mills to remove particulate from recovery boilers, power boilers, and lime kilns. As environmental regulations have become increasingly stringent in recent years, maintaining high ESP performance is of vital importance in mill operation. This paper discusses results of a literature review of the ESP technology used in industrial combustion units, including recovery boilers, as well as results of a parametric study using the well-known Deutsch-Anderson equation to correlate recovery boiler operating conditions with ESP collection efficiency. The results show that for particles up to about 0.3 μm, the ESP collection efficiency decreases drastically with increased particle size and with decreased temperature. For particles larger than 0.5 μm, however, the trend reverses; the collection efficiency increases with increased particle size and decreased temperature. The results also suggest that the particle concentration (or loading) in the flue gas has no effect on collection efficiency and that sodium chloride particles are more readily captured than sodium sulfate particles. The latter prediction, however, appears to be in contradiction with mill experience that sodium chloride particles are more difficult to capture.

Modelling of water quality-based emission limits for industrial discharges in rivers

1999 ◽  
Vol 39 (4) ◽  
pp. 185-192 ◽  
Author(s):  
A. M. J. Ragas ◽  
R. S. E. W. Leuven
Keyword(s):  
Water Quality ◽  
United States Of America ◽  
Input Data ◽  
The United States ◽  
Mixing Zone ◽  
Pollutant Loads ◽  
The United Kingdom ◽  
Emission Limits ◽  
Modelling Of Water Quality ◽  
Upstream Flow

Water authorities apply a diversity of models and input data to set water quality-based emission limits in discharge permits. To illustrate the consequences of model and data selection, two complete mixing models and four mixing zone models used in Germany, the United Kingdom (UK), the Netherlands and the United States of America (USA) were selected and applied to various discharges of cadmium. The maximum allowable annual cadmium load was calculated for each model and diverging input data for upstream flow, upstream concentration, effluent flow and effluent concentration. Due to model selection, differences in pollutant loads amounted to a factor 3. Harmonisation of the derivation of water quality-based emission limits is necessary to prevent widely divergent pollutant loads under comparable environmental conditions.

What Industry Wants: An Empirical Analysis of Health Informatics Job Postings

2021 ◽  
Vol 12 (02) ◽  
pp. 285-292
Author(s):  
Tara M. McLane ◽  
Robert Hoyt ◽  
Chad Hodge ◽  
Elizabeth Weinfurter ◽  
Erin E. Reardon ◽  
...  
Keyword(s):  
Empirical Analysis ◽  
Health Informatics ◽  
Formal Education ◽  
Practical Experience ◽  
The United States ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Education Levels ◽  
Clinical Background ◽  
Job Postings

Abstract Objectives To describe the education, experience, skills, and knowledge required for health informatics jobs in the United States. Methods Health informatics job postings (n = 206) from Indeed.com on April 14, 2020 were analyzed in an empirical analysis, with the abstraction of attributes relating to requirements for average years and types of experience, minimum and desired education, licensure, certification, and informatics skills. Results A large percentage (76.2%) of posts were for clinical informaticians, with 62.1% of posts requiring a minimum of a bachelor's education. Registered nurse (RN) licensure was required for 40.8% of posts, and only 7.3% required formal education in health informatics. The average experience overall was 1.6 years (standard deviation = 2.2), with bachelor's and master's education levels increasing mean experience to 3.5 and 5.8 years, respectively. Electronic health record support, training, and other clinical systems were the most sought-after skills. Conclusion This cross-sectional study revealed the importance of a clinical background as an entree into health informatics positions, with RN licensure and clinical experience as common requirements. The finding that informatics-specific graduate education was rarely required may indicate that there is a lack of alignment between academia and industry, with practical experience preferred over specific curricular components. Clarity and shared understanding of terms across academia and industry are needed for defining and advancing the preparation for and practice of health informatics.

scholarly journals Repair and maintenance costs of 4WD tractors and self propelled combine harvesters in Italy

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Aldo Calcante ◽  
Luca Fontanini ◽  
Fabrizio Mazzetto
Keyword(s):  
Cost Estimation ◽  
Working Hours ◽  
The United States ◽  
Operating Conditions ◽  
List Price ◽  
Optimal Time ◽  
Model Parameters ◽  
Maintenance Costs ◽  
Combine Harvesters ◽  
Engine Power

Purchasing and maintaining tractors and operating machines are two of the most considerable costs of the agricultural sector, which includes farm equipment manufacturers, farm contractors and farms. In this context, repair and maintenance costs (R&M costs) generally constitute 10-15% of the total costs related to agricultural equipment and tend to increase with the age of the equipment; hence, an important consideration in farm management is the optimal time for equipment replacement. Classical, R&M cost estimation models, calculated as a function of accumulated working hours, are usually developed by ASAE/ASABE for the United States operating conditions. However, R&M costs are strongly influenced by farming practices, operative conditions, crop and soil type, climatic conditions, etc. which can be specific for individual countries. In this study, R&M cost model parameters were recalculated for the current Italian situation. For this purpose, data related to the R&M costs of 100 4WD tractors with engine power ranging from 59 to 198 kW, and of 20 SP combine harvesters (10 straw walkers combines and 10 axial flow combines) with engine power ranging from 159 to 368 kW working in Italy were collected. According to the model, which was obtained by interpolating the data through a two-parameter power function (proposed by ASAE/ASABE), the R&M cost incidence on the list price of Italian tractors at 12,000 working hours (estimated life of the machines) was 48.6%, as compared with 43.2% calculated through the most recent U.S. model while, for self propelled combine harvesters, the R&M cost incidence at 3,000 working hours was 23.1 % as compared with 40.2% calculated through the same U.S. model.

scholarly journals Study on SO3 Cooperative Removal Effect of Ultra-low Emission Technology in Coal-fired Power Plants

2018 ◽  
Vol 53 ◽  
pp. 04005 ◽  
Author(s):  
Ding Yang ◽  
Yi Luo ◽  
XingLian Ye ◽  
WeiXiang Chen ◽  
Jun Guo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flue Gas ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Removal Rate ◽  
Flue Gas Desulfurization ◽  
Paper Briefly ◽  
Low Emission ◽  
Electrostatic Precipitators

SO3 is one of the main precursors of atmospheric PM2.5, and its emission has attracted more and more attention in the industry. This paper briefly analyzes the harm of SO3 and the method of controlled condensation to test SO3. The effect of cooperative removal of SO3 by ultra-low emission technology in some coal-fired power plants has been tested by using the method of controlled condensation. The results show that the cooperative removal of SO3 by ultra-low emission technology in coal-fired power plants is effective. The removal rate of SO3 by low-low temperature electrostatic precipitators and electrostatic-fabric integrated precipitators can be exceeded 80%, while the removal rate of SO3 by wet flue gas desulfurization equipment displays lower than the above two facilities, and the wet electrostatic precipitator shows a better removal effect on SO3. With the use of ultra-low emission technology in coal-fired power plants, the SO3 emission concentration of the tail chimney reaches less than 1 mg / Nm3.

scholarly journals Executive Higher Education Doctoral Programs in the United States: A Demographic Market-Based Analysis

10.28945/3713 ◽  
2017 ◽  
Vol 14 ◽  
pp. 001-019
Author(s):  
Sydney Freeman Jr. ◽  
Gracie Forthun
Keyword(s):  
Higher Education ◽  
United States ◽  
Doctoral Programs ◽  
Doctoral Degree ◽  
Practical Experience ◽  
The United States ◽  
Future Research ◽  
Education Programs ◽  
Doctoral Degree Programs ◽  
Education Degree

Aim/Purpose: Executive doctoral programs in higher education are under-researched. Scholars, administers, and students should be aware of all common delivery methods for higher education graduate programs. Background This paper provides a review and analysis of executive doctoral higher education programs in the United States. Methodology: Executive higher education doctoral programs analyzed utilizing a qualitative demographic market-based analysis approach. Contribution: This review of executive higher education doctoral programs provides one of the first investigations of this segment of the higher education degree market. Findings: There are twelve programs in the United States offering executive higher education degrees, though there are less aggressively marketed programs described as executive-style higher education doctoral programs that could serve students with similar needs. Recommendations for Practitioners: Successful executive higher education doctoral programs require faculty that have both theoretical knowledge and practical experience in higher education. As appropriate, these programs should include tenure-line, clinical-track, and adjunct faculty who have cabinet level experience in higher education. Recommendation for Researchers: Researchers should begin to investigate more closely the small but growing population of executive doctoral degree programs in higher education. Impact on Society: Institutions willing to offer executive degrees in higher education will provide training specifically for those faculty who are one step from an executive position within the higher education sector. Society will be impacted by having someone that is trained in the area who also has real world experience. Future Research: Case studies of students enrolled in executive higher education programs and research documenting university-employer goals for these programs would enhance our understanding of this branch of the higher education degree market.

Advanced Techniques for Establishing Long-Term Performance of Composite Repair Systems

2014 ◽  
Author(s):  
Chris Alexander
Keyword(s):  
The United States ◽  
Operating Conditions ◽  
Repair System ◽  
Composite Repair ◽  
Design Life ◽  
Repair Systems ◽  
Long Term Performance ◽  
Term Performance ◽  
Composite Repairs

Although composite materials are used to repair and reinforce a variety of anomalies in high pressure transmission gas and liquid pipelines, there continues to be widespread debate regarding what constitutes a long-term composite repair. The United States regulations require that composite repairs must be able to permanently restore the serviceability of the repaired pipeline, while in contrast the Canadian regulations take a more prescriptive approach by integrating the ASME PCC-2 and ISO 24817 composite repair standards along with a requirement for establishing a 50-year design life. In this paper the author provides a framework for what should be considered in qualifying a composite repair system for long-term performance by focusing on the critical technical aspects associated with a sound composite repair. The presentation includes a discussion on establishing an appropriate composite design stress using the existing standards, using full-scale testing to ensure that stresses in the repair do not exceed the designated composite design stresses, and guidance for operators in how to properly integrate their pipeline operating conditions to establish a design life. By implementing the recommendations presented in this paper, operators will be equipped with a resource for objectively evaluating the composite repair systems used to repair their pipeline systems.

Design Recommendations for Controlling the Jam-Clearing Hazard on Recycling Industry Balers

2005 ◽  
Author(s):  
T. Mick ◽  
K. Means ◽  
J. Etherton ◽  
J. Powers ◽  
E. A. McKenzie
Keyword(s):  
United States ◽  
Laboratory Testing ◽  
Occupational Safety ◽  
The United States ◽  
Operating Conditions ◽  
Occupational Safety And Health ◽  
Hydraulic Pressure ◽  
Design Recommendations ◽  
Recycling Industry ◽  
Safety And Health

Between 1986 and 2002, there were 43 fatalities in the United States to operators of recycling industry balers. Of these fatalities, 29 involved horizontal balers that were baling paper and cardboard (Taylor, 2002). Balers often become jammed while the baling process is occurring, and the only way to remove the jam is manually. This requires an employee to place a limb of their body into the jamming area and remove the material that is causing the jam. While lockout and tagout procedures reduce the risk of hazardous energy being released, they can still be easily bypassed, ignored, or forgotten. Recent efforts to reduce machine-related injury and death involve the development of a control system for these machines that automatically detects hazardous operating conditions and responds accordingly. The system is being developed at the National Institute for Occupational Safety and Health (NIOSH). This system, JamAlert, automatically terminates the power to the machine when a jam is detected. JamAlert detects a jam by observing both the strain that is experienced by the shear bar of the baler and the hydraulic pressure at which the ram is operating. The strain that is experienced by the baler shear bar when a jam is initiated was calculated in this study through laboratory testing and finite element modeling. Design recommendations are presented on how best to tune the JamAlert’s operating program to most effectively control the jam-clearing hazard.

Utilization of Vertiline Wire Conveyed Smart Tools in Gas Storage Field Pipeline Applications

2002 ◽  
Author(s):  
Brian S. Buck ◽  
James D. Philo
Keyword(s):  
Natural Gas ◽  
Storage System ◽  
The United States ◽  
Gas Storage ◽  
Field Configuration ◽  
The State ◽  
Operating Conditions ◽  
Welded Steel ◽  
Inspection Method ◽  
Advantages And Disadvantages

Consumers Energy, which is the largest natural gas utility in the state of Michigan and fifth largest in the United States, operates thirteen natural gas storage fields in the state as part of its Gas Transmission and Storage system. These storage fields consist of a network of storage wells connected via a series of short pipeline laterals and headers. Typical field configuration consists of one or two main headers with several laterals branching off to the gas storage wells. Due to the shorter line lengths (2.5 miles or less) and other operational conflicts, it is difficult to utilize conventional online smart pigging methods to assess the integrity of these laterals and headers. Based on the type (welded steel), average age, and operating conditions of the pipelines in these storage fields, an internal inspection method was desired. Consumers Energy has teamed with Baker Atlas to utilize their Vertiline wire conveyed MFL (magnetic flux leakage) smart tools to assess the integrity of these gas storage field headers and laterals. The Vertiline technology was originally conceived for down hole well casing integrity analysis, however, the application was found to be ideal for short section, limited access, and otherwise unpiggable pipelines. The Baker Vertiline technology can currently be used on pipeline sizes up to 24” in diameter, and larger diameter tools are under development. This paper will explore the process that Consumers Energy undertook to utilize wire conveyed MFL smart tools in its gas storage field pipelines. Field preparation for tool runs, running the tool and gathering data, and data presentation will all be reviewed. The advantages and disadvantages, techniques, capabilities, and technology of the wire conveyed MFL smart tools themselves will also be discussed, along with other potential applications such as use in analysis of pipeline river crossings, pipelines lacking pig launching facilities, and offshore production lines.

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