Kaoliini mõju veetorukatla küttepindadele
Laen...
Kuupäev
2021
Kättesaadav alates
08.09.2021
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Puitkütuse põletamisel tekkivad sadestised mõjutavad küttepindade soojusvahetust. Töö
eesmärgiks on teada saada puitkütuselisandi kaoliini mõju veetorukatla küttepindadele.
Töös kasutatakse AS Anne Soojuse koostootmisjaama veetorukatla küttepindade ja
suitsugaaside temperatuure, viiakse läbi kaoliiniga ja kaoliinita tuha katsetus ahjus
temperatuuril 1000 C ja käsitletakse teadusuuringutes saadud tulemusi. Tuvastati
küttepindade ja suitsugaasi temperatuuride erinevused kahel erineval aastal, kus kasutati
kaoliini ja kus mitte. See tähendab, et küttepinnad on puhtamad ja soojusvahetus parem.
Kaoliiniga ja kaoliinita tuha katsetamisel 1000 C ahjus oli kaoliiniga tuhk terastopsiku
pinnaga vähem seotud kui kaoliinita tuhk, mille sadestised olid silmnähtavad. Eelnevalt
on uuritud kaoliini lisamist puiduga põletamisel väikestes kateldes. Bioflex! uuring näitas,
et atmosfääri jõudev tahkete osakeste hulk ja vingugaas on vähenenud. Rootsi Chalmersi
tehnikaülikooli uurimus aga leidis, et kaoliin on tõhus absorbent igasugustele
kaaliumühenditele, mis vähendab puidu põletamisel küttepindadele tekkivaid
kaaliumsooli.
The deposits that are created in the process of burning wood fuel affect the heat exchange of heating surfaces. The purpose of this paper is to find out the effect of kaolin, an additive in wood fuel, on the heating surfaces of water tube boilers. In the paper, the temperatures of heating surfaces and flue gases of a water tube boiler are taken from the cogeneration plant of AS Anne Soojus, a test on the ashes with kaolin and without kaolin in a 1000oC furnace is conducted, and the results of scientific research are addressed. The differences in the temperatures of heating surfaces and flue gases over two years were measured, depending on whether kaolin was used or not. This means that the heating surfaces are cleaner and the heat exchange is more efficient. Testing the ashes with and without kaolin in a 1000 C furnace showed that the ash with kaolin was less attached to the surface of the steel cup, while the ashes without kaolin showed noticeable depositions. Previous studies have looked at the addition of kaolin to wood fuels in small boilers. The “Bioflex!” research showed that the amounts of solid particles and carbon monoxide reaching the atmosphere have decreased. The research of the Chalmers University of Technology in Sweden showed that kaolin is an efficient adsorbent to different types of potassium compounds, which lowers the amount of potassium salts depositing on heating surfaces during wood combustion.
The deposits that are created in the process of burning wood fuel affect the heat exchange of heating surfaces. The purpose of this paper is to find out the effect of kaolin, an additive in wood fuel, on the heating surfaces of water tube boilers. In the paper, the temperatures of heating surfaces and flue gases of a water tube boiler are taken from the cogeneration plant of AS Anne Soojus, a test on the ashes with kaolin and without kaolin in a 1000oC furnace is conducted, and the results of scientific research are addressed. The differences in the temperatures of heating surfaces and flue gases over two years were measured, depending on whether kaolin was used or not. This means that the heating surfaces are cleaner and the heat exchange is more efficient. Testing the ashes with and without kaolin in a 1000 C furnace showed that the ash with kaolin was less attached to the surface of the steel cup, while the ashes without kaolin showed noticeable depositions. Previous studies have looked at the addition of kaolin to wood fuels in small boilers. The “Bioflex!” research showed that the amounts of solid particles and carbon monoxide reaching the atmosphere have decreased. The research of the Chalmers University of Technology in Sweden showed that kaolin is an efficient adsorbent to different types of potassium compounds, which lowers the amount of potassium salts depositing on heating surfaces during wood combustion.
Kirjeldus
Bakalaureusetöö
Tehnika ja tehnoloogia õppekaval
Märksõnad
bakalaureusetööd, kaoliniit, suitsugaas, absorbent