Modeling and modernization of the boiler unit temperature control system
DOI:
https://doi.org/10.31498/2225-6733.38.2019.181487Keywords:
automatic control, boiler unit, steam temperature, superheater, supercooler, control valve, «own» condensate injection, steam enthalpy, mathematical modelAbstract
The article considers controlling the temperature of superheated steam in boiler units. When regulating the temperature of steam in modern boilers, special requirements are imposed on the accuracy of maintaining the temperature at a given level. The temperature must be maintained close to the value set in the design of the unit, regardless of the operating conditions of the boiler and its load. With a decrease in temperature, not only the effectivity of the entire installation decreases, but there is also an increase in the probability of emergency situations. An increase in temperature leads to deformation and premature wear of the metal of the boiler, resulting in the boiler emergency stop. The necessity of controlling the temperature of superheated steam in boilers is also relevant owing to the aging of the equipment. These facts make us conclude that the problem of maintaining temperature is one of the most important tasks in the boiler controlling. A review of scientific and information sources on this subject has been presented. As it follows from the above analysis, at present the controlling the temperature of superheated steam has not been fully studied. A mathematical model of the superheated steam temperature control system is presented, it taking into account the non-linearities of the subjects of research. It has been established that the control system responds adequately to disturbances and restores the set temperature of superheated steam, changing the necessary parameters of the system. It is proposed to modernize the temperature control system of the boiler unit by installing a new VariCool desuperheater and vibration control system, which will proactively identify possible malfunctions and partially diagnose the condition of the equipment in real time under operating conditions, without waiting for stops and repairs. A visualization of the system work in Scada- system simulating manual work of a technologist has been fulfilledReferences
Список використаних джерел (ГОСТ):
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References:
Konkov D.I., Zakharkin S.V., Vlasenko O.M. Sistema effektivnogo avtomaticheskogo regulirovaniia temperatury para na vykhode iz kotla [The system of effective automatic control of the steam temperature at the outlet of the boiler]. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Seriia: Elektrotekhnika, informatsionnye tekhnologii, sistemy upravleniia – Bulletin of Perm national research polytechnic university. Electrotechnics, informational technologies, control systems, 2017, iss. 23, pp. 159-166. (Rus.)
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Herbert L. Miller, Sekhar Samy. Vibration measurement of control valves. Valve Word, Toronto, 2015, iss. 10, pp. 62-66.
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