Planning Optimization of the Work Processes of Gas Cleaning Facilities of a Power Plant by Means of Mathematical Processing and Computer Simulation

The article seeks to examine the efficiency of applying means of mathematical processing and computer modeling of the work processes of gas cleaning facilities of power plants to optimize the process of planning and designing of future power plant in operation. A way of solution of the gas outbursts cleaning problem at the stage of designing measures for the development of waste processing systems through mathematical processing of expected volumes of gas outbursts and computer simulation of individual pieces of equipment and working areas as a whole is offered. The authors present the results of the processing of the projected technological processes and the gas outbursts cleaning facilities in terms of E-networks and using mathematical processing in the application Simulink, which allows to build a model of the device and to carry out calculations on the screen using the library of building blocks. A 3D model of the gas cleaning facilities, which allows to visualize the technological process and to compare it with theoretical calculations at the design stage of the future power plant and, if necessary, make changes to the project, has been created by means of computer modeling.


Introduction
At present, the electric power industry is the most important basic industry of Russia.The level of its development affects the entire national economy, as well as the level of development of scientific and technological progress in the country.
It is practically impossible to imagine modern life without electric energy.The electric power industry has invaded all spheres of human activity: industry and agriculture, science and space, and our everyday life.In industrial applications, electric power is used both for activating various mechanisms and in technological processes directly.
Major electricity producers include hydroelectric power plants, nuclear power plants and thermal power plants.Thermal power plants (TPPs) require special attention.There are about 700 large and medium-sized thermal power plants in Russia.They produce up to 70% of electricity.TPPs use organic fuel -coal, oil, gas, fuel oil, shale oil, peat.
At the stage of planning the processes of fuel and energy facilities and the development of technical documentation, a modern range of computer programs enables to present an analysis of the future TPP operation in different ways.Mathematical modeling [1-3] makes it possible to verify the correctness of the model and its correction at the stage of construction, three-dimensional computer simulation allows to get a realistic image based on the available technical documentation, to identify technical errors and make adjustments at the planning stage of individual technological processes and thermal power plants as a whole.
During the mathematical analysis it is advisable to use the E-network device [4][5][6].As an extension of Petri nets, E-nets are a graphical and mathematical tool used to model systems of different types.
The paper studies an abstracted model of thermal power plants with the possibility of expansion (Fig. 1.).where p � -a new portion of coal entered the crusher station; p � -coal is processed; p � -condensate and replenished water loss are at the storage facility; p � -the raw material is in the furnace chamber; p � -combustion products are obtained; p � -steam is supplied to the turbine; p � -bottom ash waste is transported to the recycling system; p � -gaseous wastes enter the cleaning system; p � -power is allocated to external consumers; p �� -steam from the extraction turbine is supplied to CHP; X � = (T, 0, φ � ) -the process of coal processing; , 0, φ � ) -electricity generation and steam removal; , the initial marking is represented by a vector: (1,0,1,0,0,0,0,0,0,0).
To implement the computer-built model of the E-network the technical computing application program package MatLab was used, namely, its application -Simulink.

Results and Discussion
The model created in Simulink is a balance model of material flows [6,7], consisting of several technological stages: coal losses during its preparation for combustion; generation of electricity; formation and processing of bottom ash waste; formation and cleaning of gas outbursts.For the sake of clarity of the balance model and the convenience of its expansion, processing and cleaning units were implemented in the form of subsystems.Let us consider the subsystem of cleaning gas outbursts TPP, which in turn also consists of several modules: an electric filter, carbon capture, a system of purification from nitrogen oxides and a system of desulphurization.
In conclusion, it should be noted that the resulting model can be further expanded by adding the necessary modules to its structure.

Conclusions
The problem of the use of mathematical processing and computer simulation while planning the working processes of the gas cleaning facilities of a power plant at the stage of planning and design of TPP has been considered in the paper.Optimization of gas outbursts cleaning system planning by means of mathematical processing and computer simulation has been proposed, which can make it possible to evaluate the planned performance, select the production technology, as well as to ensure a high environmental effect of the planned waste treatment system.The paper presents the results of processing of the planned technological processes and gas outbursts cleaning system in terms of E-networks with the use of mathematical processing in the application Simulink, a three-dimensional model of the gas outbursts system has been built, which allows to visualize the process and compare with theoretical calculations at the design stage of a TPP and, if necessary, make changes.

Fig. 1 .
Fig. 1.The model CHP in terms of E-nets.