Woodchip Combustion Process Quality and the Amount of Combustion Air

2013 ◽  
Vol 308 ◽  
pp. 115-119 ◽  
Author(s):  
Peter Skok ◽  
Miroslav Rimár ◽  
Jozef Mižák
Keyword(s):  
Carbon Monoxide ◽  
Control System ◽  
Combustion Process ◽  
Process Quality ◽  
Point Of View ◽  
Unburned Carbon ◽  
Optimal Ratio ◽  
Secondary Air

The paper deals with woodchip combustion from the point of view of burning control. Control system has to ensure optimal ratio of fuel and air. There are a lot of conditions to satisfy optimization of woodchip burning. The contribution of the paper is concentrated on confirmation of fact that primary/secondary air relation can significantly reduce the among of unburned carbon monoxide.

scholarly journals Comprehensive Thermodynamic Analysis of the Humphrey Cycle for Gas Turbines with Pressure Gain Combustion

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3521 ◽  
Author(s):  
Panagiotis Stathopoulos
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Combustion Process ◽  
Ideal Gas ◽  
Point Of View ◽  
Pressure Gain Combustion ◽  
Combustion Technology ◽  
Secondary Air ◽  
And Performance ◽  
The Impact

Conventional gas turbines are approaching their efficiency limits and performance gains are becoming increasingly difficult to achieve. Pressure Gain Combustion (PGC) has emerged as a very promising technology in this respect, due to the higher thermal efficiency of the respective ideal gas turbine thermodynamic cycles. Up to date, only very simplified models of open cycle gas turbines with pressure gain combustion have been considered. However, the integration of a fundamentally different combustion technology will be inherently connected with additional losses. Entropy generation in the combustion process, combustor inlet pressure loss (a central issue for pressure gain combustors), and the impact of PGC on the secondary air system (especially blade cooling) are all very important parameters that have been neglected. The current work uses the Humphrey cycle in an attempt to address all these issues in order to provide gas turbine component designers with benchmark efficiency values for individual components of gas turbines with PGC. The analysis concludes with some recommendations for the best strategy to integrate turbine expanders with PGC combustors. This is done from a purely thermodynamic point of view, again with the goal to deliver design benchmark values for a more realistic interpretation of the cycle.

scholarly journals Biomass Combustion Control in Small and Medium-Scale Boilers Based on Low Cost Sensing the Trend of Carbon Monoxide Emissions

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2030
Author(s):  
Jana Mižáková ◽  
Ján Piteľ ◽  
Alexander Hošovský ◽  
Ivan Pavlenko ◽  
Marek Ochowiak ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Control System ◽  
Process Control ◽  
Block Diagram ◽  
Low Cost ◽  
Combustion Process ◽  
Quality Parameters ◽  
Biomass Combustion ◽  
The Real ◽  
Medium Scale

The article deals with the possibility of efficient control of small and medium-scale biomass-fired boilers by implementing low-cost sensors to sense the trend of carbon monoxide emissions into control of the biomass combustion process. Based on the theoretical analysis, a principle block diagram of the process control system was designed for the possibility of providing near-optimal control of the biomass combustion regardless of its quality parameters. A cost-effective hardware solution to obtain the dependence of CO emissions on O2 concentration in flue gas during combustion and new control algorithms was implemented into the process control and monitoring system of the biomass-fired boilers to test them in the real operation. A description of the designed control system, a data analysis of the monitored values and their impact on combustion process, and some results of the implemented control of the real biomass combustion process are presented in the article.

scholarly journals HARDWARE AND SOFTWARE OF AUTOMATIC CONTROL SYSTEM OF FUEL COMBUSTION PROCESS IN LOW AND MEDIUM POWER BOILERS. PART 1. METHOD AND HARDWARE

2021 ◽  
pp. 37-45
Author(s):  
Arthur Zaporozhets ◽  
Yurii Kuts
Keyword(s):  
Carbon Monoxide ◽  
Control System ◽  
Nitrogen Oxides ◽  
Oxygen Sensor ◽  
High Efficiency ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Fuel Combustion ◽  
Combustion Control ◽  
Variable Frequency Drive

In Ukraine today there are more than 6000 boiler plants with a heating capacity of up to 1 Gcal/h with an efficiency of about 70 %, requiring replacement or modernization, 40 % of boilers are operated with an efficiency of less than 82 %, about 11000 boilers with a capacity of 100 kW to 1 MW have been in operation for over 20 years. Although the part of these boilers in the municipal heat power system of Ukraine does not exceed 14 %, the projected savings in natural fuel in these boilers is more than 130 million cubic meters per year. Thus, increasing the efficiency of the fuel combustion process in small and medium power boilers is an urgent task at the present time. The article presents the results of creating a method and hardware that implements it, to increase the speed and reliability of monitoring the process of fuel combustion in boiler units based on measuring the concentration of residual oxygen in exhaust gases. The developed method is implemented by stepwise correction of the ratio of the air-fuel mixture entering to the furnace of the boiler for combustion, according to feedback signals from a broadband oxygen sensor manufactured by Bosch, located in the outgoing channel. The air-fuel ratio control with automatic adjustment of the blower fan speed depending on the amount of fossil fuel supplied for combustion ensures low-toxic combustion of fuel with low emissions of nitrogen oxides and carbon monoxide, and high efficiency. Additional use of a variable frequency drive in the combustion control system allows to reduce energy consumption by 30-40 %, eliminate starting currents and motor overloads, reduce mechanical wear of equipment, increase the service life of contact switching equipment. In general, the developed fuel combustion control system allows to optimize the fuel combustion mode, taking into account the actual conditions, operating modes of the boiler unit and fuel characteristics; to reduce specific fuel consumption by at least 10%; to reduce the level of emissions of nitrogen oxides up to 40 % and carbon monoxide up to 50 %; to increase the efficiency by at least 5 %; qualitatively to simplify the work of the boiler maintenance personnel.

Monitoring of Operating Conditions of Biomass Combustion Process

2013 ◽  
Vol 308 ◽  
pp. 153-158 ◽  
Author(s):  
Jana Boržíková ◽  
Jozef Mižák ◽  
Ján Piteľ
Keyword(s):  
Carbon Monoxide ◽  
Control System ◽  
Process Control ◽  
Process Monitoring ◽  
Combustion Process ◽  
Process Control System ◽  
Operating Conditions ◽  
Biomass Combustion ◽  
Process Variables ◽  
Technical Realization

This paper describes technical realization of operation monitoring of biomass combustion process. Due to specific properties of biomass fuel and specific demands for economic and ecological conditions of operation of biomass combustion devices, process control system has to be monitored. During process monitoring problem with sensing process variables occurs and that’s why this paper also deals with a method of signal filtration of carbon monoxide and oxygen concentration, because signal includes an interference parts.

The Development of a Monitoring and Control System for Pulverised Coal Flames Using Neural Networks

2003 ◽  
Author(s):  
O. H. Tan ◽  
S. J. Wilcox ◽  
J. Ward ◽  
M. Lewitt
Keyword(s):  
Control System ◽  
Low Cost ◽  
Air Flow ◽  
Combustion Process ◽  
Combustion Noise ◽  
Pollutant Emissions ◽  
Furnace Chamber ◽  
Gaseous Emissions ◽  
Monitoring And Control ◽  
Secondary Air

This paper presents the results obtained from a series of experiments that have been conducted on a 150kW pf burner rig based at Casella CRE Ltd. in the United Kingdom. These experiments systematically varied the burner swirl number and the secondary air flow rate over a significant range for two different coals so that both satisfactory and ‘poor’ combustion conditions were obtained. The infra-red emissions from the flame and the combustion noise generated in the furnace chamber were measured with appropriate sensors as were the fuel and air flow rates and pollutant emissions. The signals from the sensors were analysed using signal processing techniques to yield a number of features. These in turn were employed to train a neural network to accurately estimate the gaseous emissions from the rig, such as NOx and CO. In a separate set of experiments, where the combustion process was placed in a poor condition, the sensors were coupled with the neural models and incorporated into an intelligent control system, which was able to alter the excess air level to improve the process. In this fashion simultaneous low Nox and CO levels were achieved with both coal types. This method thus uses a combination of relatively low cost sensors and artificial intelligence techniques to control the combustion of the pulverised fuel burner. It is envisaged as particularly attractive for multiple burner installations that are fed from a common manifold, where individual burner performance is not known.

The Control of the Eye's Intrinsic Muscles: A Multivariable Optimum Performance Control System

1968 ◽  
Vol 1 (8) ◽  
pp. T.129-T.132 ◽  
Author(s):  
F. M. Toates
Keyword(s):  
Control System ◽  
Control Systems ◽  
Pupil Diameter ◽  
Control Model ◽  
Point Of View ◽  
Theoretical Point ◽  
Pupil Control ◽  
Performance Control ◽  
A Value ◽  
Intrinsic Muscles

The reciprocal interaction between the accommodation and pupil control systems of the human eye is examined from a theoretical point of view. The system, which is responsible for maintaining pupil diameter at a value which is a compromise between conflicting requirements, is represented by a control model, and is considered in terms of the concept of a performance index.

Effect of H2 and CO Content in Syngas on the Performance and Emission of Syngas-Diesel Dual Fuel Engine - A Review

2014 ◽  
Vol 699 ◽  
pp. 648-653 ◽  
Author(s):  
Bahaaddein K.M. Mahgoub ◽  
Suhaimi Hassan ◽  
Shaharin Anwar Sulaiman
Keyword(s):  
Carbon Monoxide ◽  
Diesel Engines ◽  
Combustion Process ◽  
Exhaust Emission ◽  
Dual Fuel ◽  
Pure Liquid ◽  
Compression Ignition ◽  
Performance And Emission ◽  
Combustion Duration ◽  
Combustible Gases

In this review, a series of research papers on the effects of hydrogen and carbon monoxide content in syngas composition on the performance and exhaust emission of compression ignition diesel engines, were compiled. Generally, the use of syngas in compression ignition (CI) diesel engine leads to reduce power output due to lower heating value when compared to pure liquid diesel mode. Therefore, variation in syngas composition, especially hydrogen and carbon monoxide (Combustible gases), is suggested to know the appropriate syngas composition. Furthermore, the simulated model of syngas will help to further explore the detailed effects of engine parameters on the combustion process including the ignition delay, combustion duration, heat release rate and combustion phasing. This will also contribute towards the efforts of improvement in performance and reduction in pollutants’ emissions from CI diesel engines running on syngas at dual fuel mode. Generally, the database of syngas composition is not fully developed and there is still room to find the optimum H2 and CO ratio for performance, emission and diesel displacement of CI diesel engines.

scholarly journals The flame spectrum of carbon monoxide

1940 ◽  
Vol 176 (967) ◽  
pp. 505-521 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Electronic State ◽  
Excited Electronic State ◽  
Combustion Process ◽  
Wave Number ◽  
Band Spectrum ◽  
Liquid Form ◽  
Triangular Form ◽  
Reduced Pressure

The spectrum of the flame of carbon monoxide burning in air and in oxygen at reduced pressure has been photographed on plates of high contrast which display the band spectrum clearly above the continuous background. Greater detail has been obtained than has been recorded previously and new measurements are given. The structure of the spectrum has been studied systematically. It is shown that the bands occur in pairs with a separation of about 60 cm. -1 , this separation being due probably to the rotational structure. Various wave-number differences are found to occur frequently, and many of the strong bands are arranged in arrays using intervals of 565 and 2065 cm. -1 . The possible origin of the spectrum is discussed. The choice of emitter is limited to a polyatomic oxide of carbon, of which carbon dioxide is the most likely. The spectrum of the suboxide C 3 O 2 shows some resemblance to the flame bands, but this molecule is improbable as the emitter on other grounds. A peroxide C0 3 is also a possibility, but no evidence for the presence of this has been obtained from experiments on the slow combustion of carbon monoxide. Carbon dioxide in gaseous or liquid form is transparent through the visible and quartz ultra-violet, and the flame bands are not obtained from CO 2 in discharge tubes. Comparison with the Schumann-Runge bands of oxygen shows that it is possible that the flame bands may form part of the absorption band system of CO 2 which is known to exist below 1700 A if there is a big change in shape or size of the molecule in the two electronic states. The electronic energy levels of CO 2 are discussed. Since normal CO 2 is not built up from normal CO and oxygen, an electronic rearrangement of the CO 2 must occur after the combustion process. Mulliken has suggested that the molecule in the first excited electronic state, corresponding to absorption below 1700 A, may have a triangular form. The frequencies obtained from the flame bands are compared with the infra-red frequencies of CO 2 . The 565 interval may be identified with the transverse vibration v 2 , indicating that the excited electronic state is probably triangular in shape. The 2065 interval cannot, however, be identified with the asymmetric vibration v 3 with any certainty. If the excited electronic state of CO 2 is triangular, then molecules formed during the combustion by transitions from this level to the ground state may be “vibrationally activated”. This is probably the reason for many of the peculiarities of the combustion of carbon monoxide.

Systematic Approach to the Assessment of Production Control Functioning at Hazardous Production Facilities of Oil and Gas Industry

2021 ◽  
pp. 70-75
Author(s):  
R.I. Fatkhutdinov ◽  
◽  
Keyword(s):  
Control System ◽  
Systematic Approach ◽  
Oil And Gas ◽  
Production Control ◽  
Point Of View ◽  
Industrial Safety ◽  
Production Control System ◽  
System Functioning ◽  
Hazardous Production ◽  
Integral Indicator

One of the main causes of accidents at hazardous production facilities of oil and gas production is the inefficient work of production control over compliance with industrial safety requirements. At present there are no criteria for its assessment in the Russian legislation. It is established in the study that that production control in the industrial safety management system performs the role of «control» in accordance with the Shewhart-Deming cycle PDCA, and its main function is to work with nonconformities. In connection with the above, it is proposed to approach production control not only from the point of view of the process, but also from the system approach. To assess the system functioning, the criteria of «effectiveness», «efficiency», «integral indicator» are considered. It is established that from the point of view of proactivity in achieving the goals of production control, the most preferable is the assessment of the integral indicator of the production control system functioning. The considered existing and possible approaches to the assessment of the production control system and the statistical processing of the results of the expert assessment of nineteen parameters confirmed the need for a systematic approach. Based on this, the hypothesis of the production control system functioning is proposed and statistically substantiated, and four main parameters for calculating the integral indicator of the production control system functioning are considered. The built mathematical model based on the fuzzy logic clearly demonstrates the dependence of the integral indicator of the production control system functioning on the considered input parameters. The proposed proactive approach to the assessment of the production control system through nonconformity management is universal and applicable to the «control» function of any control system. It can also be used in the work of Rostechnadzor and be an incentive for enterprises to improve the quality, efficiency, and effectiveness of the production control system.

scholarly journals Reduction of Major Pollutants via Air-staged Commbustion on Burner System

2013 ◽  
Vol 64 (1) ◽  
Author(s):  
Mohammad Nazri Mohd. Jaafar ◽  
Mohd Nur Hanafi Zaini
Keyword(s):  
Combustion Process ◽  
Primary Concern ◽  
Nox Emissions ◽  
Percent Reduction ◽  
Secondary Air ◽  
Secondary Zone ◽  
Combustion Processes ◽  
Different Gases ◽  
Air Staging ◽  
Co Emission

Emission from the combustion processes can cause adverse effect to the environment.  The formation of pollutants such as NOx, CO, CO2 and SOx are hazardous and harmful to the ecosystem.  The awareness about the pollution due to the combustion activities, particularly in industrial field has set off an effort to find more comprehensive and enhanced technologies to reduce these pollutants.  There are several methods that can be used to reduce the emissions of these pollutants either by combustion modifications or post combustion treatment.  In this research, the method used is the post combustion treatment, i.e. the air staging method.  By air staging techniques, some of the combustion air will be directed into the primary combustion zone, while the remaining air is directed into the secondary zone.  The function of the secondary air is to reduce the peak flame temperatures, which theoretically reduce the emissions of NOx emissions.  The primary concern for this research is to study the effectiveness of the air staging in reducing NOx, CO, SO2, and UHC emissions from the combustion process.  The results obtained showed significant reduction in all major pollutants, i.e., a 31.8 percent reduction for CO emission, 16.8 percent for NOx, 12.7 percent for SO2 and 10.3 percent for UHC.  These reductions were obtained at different equivalence ratios for different gases.

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