A comprehensive test system for proton exchange membrane fuel cells (PEMFCs) is designed and developed for monitoring and controlling the inlet and outlet parameters and safety issues of fuel cells. The data acquisiti...
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A comprehensive test system for proton exchange membrane fuel cells (PEMFCs) is designed and developed for monitoring and controlling the inlet and outlet parameters and safety issues of fuel cells. The data acquisition and output instruction rely on the connection between PLC (programmable logic controller) and OPC (object linking and embedding for process control). Based on Siemens S7-200 series PLC and PID (proportion integration differentiation) technology, the margin of error in relative humidity of inlet air is controlled at less than 0.7%. Furthermore, a hydrogen recycling system and an alarm module are introduced, considering the hydrogen or nitrogen solenoid valve power failure, cooling fan power failure, temperature anomaly, and hydrogen leakage. This developed test system is evaluated by the experimental investigation of PEMFC performance. The results show that the test system has very good test and control performances. At a cell temperature of 40 degrees C, enhanced performance in the polarization tests is depicted at a high humidification temperature of 60 degrees C.
A good grade coke produces highest thermal energy and it is highly efficient in hot metal reduction. In order to concentrate the carbon in coke, the coke making process involves carbonisation of coal to high temperatu...
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A good grade coke produces highest thermal energy and it is highly efficient in hot metal reduction. In order to concentrate the carbon in coke, the coke making process involves carbonisation of coal to high temperature (1100 degrees C) in an oxygen-free atmosphere. There is always a need to efficiently automate the coke oven operations as much as possible. In order to improve the level of control and management of coke oven, the research on intelligent control system is carried out. In modern advanced control system of coke oven, the control scheme of combination of feedback and feed-forward merged with management is widely utilised. The integrated management and control system of coke oven is introduced systematically, including the production plan and scheduling management (dynamic scheduling) and heating control system (mathematical modelling) i.e. evaluating battery temperature, intelligent combustion control system and the pressure control of gas collector of coke oven battery.
With the development of industrial processcontrol, more and more data need to be exchanged among industrial processcontrollers. Based on analysis of advantages & shortcomings of existing data sharing schemes amo...
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ISBN:
(纸本)9781510845541
With the development of industrial processcontrol, more and more data need to be exchanged among industrial processcontrollers. Based on analysis of advantages & shortcomings of existing data sharing schemes among industrial processcontrollers, a new high-efficiency scheme is provided in this paper. Compared to other schemes, the network load is reduced and system reliability is enhanced, and the configuration is simpler. Moreover, dual network mechanism is designed to minimize data packet loss, and UDP is adopted to resend lost data while broadcasting the next message. Repeated messages can be identified and discarded. This scheme has been applied in various projects and proven effective.
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