Abstract In recent years, coal-fired power units developed in the direction of large-scale, and therefore the simulation system of large-scale firepower unit has been booming. Small unit equipment is facing the problem of aging, inefficient, and therefore will be gradually eliminated. However, due to the actual demand of industry, some small thermoelectric coupling units have been put into operation. Under... In recent years, coal-fired power units developed in the direction of large-scale, and therefore the simulation system of large-scale firepower unit has been booming. Small unit equipment is facing the problem of aging, inefficient, and therefore will be gradually eliminated. However, due to the actual demand of industry, some small thermoelectric coupling units have been put into operation. Under the comprehensive influence of historical development level and enterprises’ overall economic benefit, some small thermoelectric coupling unit operation and maintenance personnel’s overall level is not high. Therefore, this paper established a circulating fluidized bed (CFB) boiler simulation system based on XinXiang HG-440 CFB, and analyzed final simulation system. Simulation process from thermal efficiency to thermal energy transformation were researched based on rules of thermal cycling and outlet of improving thermal energy utilization. The result showed that the simulation which is put up in this paper is suitable for the development of the thermal cycling system based on boiler simulation. Read More Read Less

Abstract The people who provide importance to environmental protection is becoming more and more high, where the water as the source of life literally become the top priority. Monitoring the turbidity of water is very important, so water quality turbidity detection based on image recognition system design has become a hot research topic. In the study, first it has been carried... The people who provide importance to environmental protection is becoming more and more high, where the water as the source of life literally become the top priority. Monitoring the turbidity of water is very important, so water quality turbidity detection based on image recognition system design has become a hot research topic. In the study, first it has been carried on the investigation to the current research status; And then the need of the technology and theory in the process of system design are analyzed; Then the theory with practical design improved the water quality turbidity detection based on image recognition system. Finally, the system has carried on the actual experiments, and through the contrast analysis of the experimental results verify the feasibility and advantage of the system. The research results prove that the turbidity of the water quality detection based on image recognition system is more scientific and reasonable than the traditional system. Read More Read Less

Abstract One of the most used generators applied in medium capacity wind system is the permeant magnet synchronous generator, because of its high efficiency. The wind speed is constantly changing and the control system can be controlling the generator´s speed by currents to maximize the wind energy. In order to optimize the operation of the wind system, a robust control using... One of the most used generators applied in medium capacity wind system is the permeant magnet synchronous generator, because of its high efficiency. The wind speed is constantly changing and the control system can be controlling the generator´s speed by currents to maximize the wind energy. In order to optimize the operation of the wind system, a robust control using Super-Twisting algorithm is applied, with which the generated power will be delivered to the grid electricity efficiently. We propose a decentralized controller in cascade form where the first stage the speed is controlled and the second stage the grid-side inverter controller side to regulate the bus DC-voltage and connect the wind system with the utility grid. A dynamic model of the permanent magnet synchronous generator at dq coordinate frame is used in the process design of the speed controller. A LCL-filter is used as coupling medium between the wind system and the grid. Finally, simulation results of the wind systems are reported to validate the performance of the proposed controller. Read More Read Less