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Equipped with outdated installations from the nineteen-fifties and nineteen-sixties, Chisinau CHP-1, operates with an electrical efficiency below 20%. However its decommissioning encounters several problems, related to the shortage of power generation in the republic, and to the difficulty of ensuring the thermal load during the summer time. A reasonable solution would be to disassemble the medium...
The purpose of this paper is to carry out a comparative analysis between different sources of producing heat in a district heating system that can be used in a transition period from a technically obsolete source to a state-of-the-art source. What is being analyzed is the impact of the technology on the mode of operation and the degree of integration in the new source.
The combustion characteristics of non-premixed natural gas-air in industrial furnace were investigated using Computational Fluid Dynamics (CFD) approach. The study aimed to predict the effect of the air-fuel ratio on the temperature distribution and pollutant emission at the exhaust gas. The boiler under investigation is a 85 MWe, wall firing boiler with nine radially stratified flame core burners...
Rural electrification in an archipelago country like Indonesia is a challenge. Indonesian government has stated that basic need of electricity is 60 kWh, however it is not easy to fulfill it. Fortunately, Indonesia is rich in biomass potency. Therefore, converting biomass energy to electricity might be a solution to the country electricity problem. A simple thermal energy harvesting system comprised...
This paper describes the design of unconstrained model predictive controller (MPC) and the corresponding simulation environment. The resulting controller is developed in Java programming language and implemented as a standalone application. The idea of this work is to test an MPC application in a distributed control system (DCS) run-time environment in a simulation mode before it can be implemented...
A method of operating gas turbine generator by mixing air with the cooled recirculating combustion gases, compressing of fuel and air mixture at the cooled recirculating combustion gases, combustion chamber pressurized fuel in the medium obtained compression mixture with the cooled air recirculated products of combustion to form a high-temperature gaseous combustion products, gas turbine decompression...
The methods of optimization and mathematic modeling of energy utility systems at hydrocarbon raw materials (natural gas, gas condensate and oil) processing plants have been developed. They are based on calculation modules of separate facilities and units; technological process mathematic models; creation of a rational energy-balance involving gaseous waste, using them in the processes of electricity,...
In a model based control approach that uses a neural network, it is critical that the sign of the gain associated with each input-output pair of the neural model be correct. If the sign of the gain is not correct, it is possible that the controller may move an input in the wrong direction resulting in poor performance. In this paper, a novel algorithm for computing the probability of determining the...
The issues of increasing the efficient use of secondary energy resources to generate electricity at the metallurgical plant have been analyzed. The TBS research work of power plant of OJSK «Magnitogorsk iron and Steel work» was carried out in different models, ways to manage specific fuel consumption for electricity generation have been identified. As a result the factors have been investigated, forming...
Modern gas-tube boilers must meet environmental standards. To concentrations of toxic emissions requirements are regulated by environmental regulations. One way of reducing emissions of nitrogen oxide concentrations, is an intensification of processes of heat exchange due to changes in the profile of the furnace. The paper discusses the results of a numerical calculation of heat and mass transfer...
For improving the load-following capacity of existing grate boiler units, an MPC control concept based on the combustion power soft-sensor is developed. Because the combustion power estimation has a very quick response to the primary air flow input, the load-following speed of the boiler control system will be improved considerably. The proposed MPC strategy is tested with the BioPower 5 CHP plant...
This study aims to evaluate the implications of the use of maritime pine non-debarked wood chips as an alternative solid fuel in industrial boilers in Portugal, highlighting the energy properties and chemical composition of the ash produced. Several samples have been collected from different sources, on which an approximate analysis is carried out to determine the volatile matter content, fixed carbon...
There will be waste of fuel causing economical loss and effects on environment due to improper combustion of fuel and air in boiler. Thus boiler combustion control need to be perfect and able to provide a continuous supply of steam at desired load demand. A single loop PID controllers are mostly used for combustion control of solid fuel fired boiler because of their simple structure and are easy to...
Skill testing different kinematic schemes of nitrogen oxide, used in the numerical simulation of the combustion environment in relation to the burning of coal dust on the basis of one-dimensional and three-dimensional mathematical model of aerodynamics, combustion and heat transfer.
The article provides a method of assessing the effectiveness of CHPP units based on differential-exergy method. Technical and economic indices of CHPP operating regime such as unit exergic efficiency electric power and thermal exergy delivering, technical and economic exergy efficiency, the specific costs of electrical energy and thermal exergy are considered. These indices can extend traditional...
Real-time and automatic tracking emissions of vessels can help the maritime traffic department and environmental monitoring department to study quantitatively and provide foundation for setting pollution reduction measures, and defining policies for management departments. Traditionaly method is based on fuel consumptions of vessels which need the cooperation of vessel operators; it is hard to realised...
This brief focuses on the control of steam power plants using a nonlinear model-based controller with deadtime compensation that is efficient for narrow and wide power demand ranges. The variables to be controlled are the boiler pressure and the power generation. The challenge in controlling this system lies in the ability to overcome the strong nonlinear interactions that a power plant exhibits as...
The article deals with the program realization of an indistinct adjuster in a control system of TPS' steam boiler for adaptation of the PID-adjuster based on the precise term-sets. The practical importance of the research work is in development of the step-time algorithm of fuzzification of continuous physical sizes of technological process of a boiler and the block diagram of management of a steam...
From a control point of view, the biomass combustion is extremely complex process with significant dynamic couplings among variables and a number of measurable and non-measurable disturbances. The relationships among these variables are usually highly non-linear with long time-delays. Therefore, it is often necessary to use computational intelligence methods in modeling and control of biomass combustion...
The research on the coordinated control system of ultra-supercritical coal-fired (USC) power unit is usually based on a kind of mathematical model, which is used to test the correctness of the design concept and the effectiveness of the control strategy. If the mathematical model cannot reflect the intrinsic nature of the controlled object, the simulation results are difficult to explain that the...
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