Zveza društev gradbenih inženirjev in tehnikov slovenije
ovitek_maj_2009.jpg

Objavljeno v: Gradbeni vestnik - 1 - 1964

Avtorji

Janko Bleiweis, inž.

Hidravlične izpopolnitve hladilnih stolpov termoelektrarn

UDK: 532.5:697.97:621.311.22

Brezplačen elektronski izvod revije:
Celoten članek si preberite v elektronski različici revije Gradbeni vestnik v PDF obliki.

Hydraulic improvements of cooling towers in coal burning power plants

Sum
»Vodogradbeni laboratorij« (Hydraulic Laboratory) at Ljubljana has been cooperating with designers of cooling towers of hydro-electric plants for years. The Laboratory studies and improves the hydraulic qualities of constructional parts of cooling towers. The first researches resulted in the improvement of the water supply and its distribution above the sprinkler. The existent cooling towers had a very unsuitable level development in the distribution network above the sprinkler. The water was much deeper in the channels near the wall of the cooling tower than in its center. With changing the intakes into the distribution channels, i. e. with a slight enlargement of their cross section, and with changing the shape and the form of the connection with secundary channels, the conditions were improved as shown in Fig. 3. Smaller differences of water depths in the distribution channels were completely removed during later experiments by deepening the channels. So the cross section was considerably enlarged. The channels with the increased depths also have a positive function as air stream directing slabs. Further experiments should determine that arrange-

Summary

»Vodogradbeni laboratorij« (Hydraulic Laboratory) at Ljubljana has been cooperating with designers of cooling towers of hydro-electric plants for years. The Laboratory studies and improves the hydraulic qualities of constructional parts of cooling towers. The first researches resulted in the improvement of the water supply and its distribution above the sprinkler. The existent cooling towers had a very unsuitable level development in the distribution network above the sprinkler. The water was much deeper in the channels near the wall of the cooling tower than in its center. With changing the intakes into the distribution channels, i. e. with a slight enlargement of their cross section, and with changing the shape and the form of the connection with secundary channels, the conditions were improved as shown in Fig. 3. Smaller differences of water depths in the distribution channels were completely removed during later experiments by deepening the channels. So the cross section was considerably enlarged. The channels with the increased depths also have a positive function as air stream directing slabs. Further experiments should determine that arrangement, hanging height, and shape of plate sprinklers which disperse the inflow in the most uniform way. The new shape of plate with a larger diameter and with an especially shaped surface has shown a much better dispersing of the inflowing water. Both plates, the new one which was the last of 18 tested plates — and the former plate — are shown in Fig. 4. Fig. 2. shows two characteristic diagrams, representing the quantitative distribution of the inflow on the base. It is worth mentioning that the experiments dealing with hydraulic problems of cooling towers also brought about some special researches with the aim to find out the local hydraulic losses at rectangular branchings of channels with a free level. Series of tests were carried out, in which one part of the inflowing water flowed into one branch and the remaining part into the other. At each discharge the depths were changed. The tests show rather regular functional relations, in which the energy losses depening on Fr are given. The results of these tests also include proposals how to shape the rectangular branching in order to demi-nish the hydraulic losses.

Karlovška 3
1000 Ljubljana, SLOVENIJA

Phone: +386 1 52-40-200
Fax: +386 1 52-40-199
email: gradb.zveza@siol.net,
gradbeni.vestnik@siol.net
http://www.zveza-dgits.si