The article is focused on the solution of heat penetration through the body of a chimney based on the measurements of output temperatures of flue gases coming out of a chimney and their dew point, in order to determine the minimum flue gas temperature at the bag filter inlet. INTRODUCTIONThe personnel of the Department of Power Engineering of the VŠB-TU Ostrava have recently solved a very interesting and unusual task. The unusual nature of the task rested both in the very subject in question and in the location of the required measurement points. One of the measuring sites was located at the top (head) of the chimney. This meant repeated climbing up the ladder to a 123 m high chimney, installation of thermocouples in the outlet section of the chimney, installation of the measuring system on the highest gallery of the chimney, stretching connecting S-net cable between the measuring system and a PC located in the measuring vehicle. Last but not least, the activities also included measurements of surface temperatures of the chimney shaft at four levels. The subject of the solution was to find the heat penetration coefficient through the chimney wall and to measure the flue gas temperatures at the outlet of the chimney, before and after its repair, and to find the dew point of the flue gases, etc. The main objective of the task was to determine the minimum flue gas temperature before the bag filter in order to prevent condensation of flue gases in the bag filter and in the chimney as well.The task also included detailed screening of the flue gas temperature at the outlet of the chimney at minimum boiler output power and calculation of the change of the heat penetration coefficient through the chimney wall, depending on the performed chimney shaft repairs.At this point, it is convenient to inform you that the concrete measurements took place during combustion of various mixtures of brown and black coal and biomass. MEASURING SYSTEM, MEASURING METHODS, MEASURING POINTSThe values necessary for subsequent calculations to meet the desired objectives were measured using both an independent technique, operated by the Department of Power Engineering personnel, and by reading the operating instruments. Continuous monitoring of flue gas temperature values was performed using SOLARTRON Schlumberger measuring system, calibrated in the stateaccredited laboratory.Flue gas temperature at the inlet into the chimney t sp1 has been determined by means of network continuous measurement technique using 9 pieces of thermocouples type "K", placed in a rectangular sheet-metal flue gas ducting before the flue gas enters the concrete chimney at the height of +8 m above the ground.The flue gas temperature at the outlet of the chimney t sp2 was continuously measured at the mouth of the outlet confusor at a height of +123 m. 5pcs of thermocouples type "K" located in the outlet section were used to perform the measurements.
It is still necessary to be interested in the efficient production of heat and electricity nowadays. The prevailing method of production of electricity in the Czech Republic has been the conversion of heat energy released during the combustion of fuels.This fact is also associated with a large field of diagnostic measurements focused on monitoring the efficiency of this conversion and the subsequently emerging pollutants. This specific area of diagnostic measurements has its characteristic features, which are descripe in this article.
This article describes two examples of utilization of surface temperature measurement of solid substances. These surface temperature measurements are carried out through the use of spot-welded thermocouples, and the measurement itself, archiving and data processing were performed using SOLARTRON Schlumberger measuring system. The diagnostics measurements were carried out in order to detect the issue of uneven heating of door components and electromotor frames in the technological process of their production. MEASURING SYSTEMThe measured temperatures were taken and saved by SOLARTRON Schlumberger measuring system, which is a computer-controlled system suitable for thermal-technical measurements in power plants and industry. SOLARTRON Schlumberger measuring system, which is used for the above described measurements, consists of a computer I/O card "3595 4A" and external collecting cards "IMP 35951". This measuring system complies with ISO 2548 and ISO 9001 standards. Communication between the interface card (4A 3595) located in the PC computer and the external collecting cards (IMP 35951) is performed through an S-Net cable, whose length can be up to 1500 m. Communication and processing of measured data is performed using "PMS" software.
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