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De-aeration of feedwater by membrane-technique; Avgasning av spaedvatten med membranteknik

Technical Report:

Abstract

District heating systems and boilers should to be fed with de-aerated water to prevent corrosion. The water can be de-aerated chemically or thermally by heating with hot water or steam. Society`s increased environmental consciousness demands that industry reduce the use of chemicals. A DOR plant for de-aeration of feedwater to the district heating system has been installed for evaluation at the district heating plant in Mora. The DOR plant is build on a so-called DOR membrane concept (Dissolved Oxygen Removing) that uses a vacuum system and no chemicals. This report describes the evaluation of the DOR plant. The test show that the DOR plant can produce water with a very low oxygen content. The deciding factor for how low the oxygen content will be depends on the capacity of the vacuum pump. The temperature of the water is also very important. The lower the temperature the less the oxygen content. It was impossible to establish the lowest possible oxygen content as the vacuum pump began to cavitate at a pressure of 30-40 mbar. During the test the lowest oxygen content of 9 {mu}g O{sub 2}/kg at 15 degrees C was achieved. However at this level the pump cavitated seriously. By  More>>
Authors:
Hellman, M H [1] 
  1. Ingenjoersfirma Mats H Hellman, Haegersten, (Sweden)
Publication Date:
Dec 01, 1994
Product Type:
Technical Report
Report Number:
SVF-523
Reference Number:
SCA: 400105; PA: SWD-95:007031; EDB-95:030030; SN: 95001320518
Resource Relation:
Other Information: PBD: Dec 1994
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; HEAT DISTRIBUTION SYSTEMS; CORROSION PROTECTION; DEAERATORS; FEEDWATER; WATER TREATMENT; DISTRICT HEATING; MEMBRANES; OXYGEN; BOILERS; WATER CHEMISTRY; TEMPERATURE DEPENDENCE; 400105; SEPARATION PROCEDURES
OSTI ID:
10114468
Research Organizations:
Stiftelsen foer Vaermeteknisk Forskning, Stockholm (Sweden)
Country of Origin:
Sweden
Language:
Swedish
Other Identifying Numbers:
Journal ID: ISSN 0282-3772; Other: ON: DE95737676; TRN: SE9507031
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
23 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Hellman, M H. De-aeration of feedwater by membrane-technique; Avgasning av spaedvatten med membranteknik. Sweden: N. p., 1994. Web.
Hellman, M H. De-aeration of feedwater by membrane-technique; Avgasning av spaedvatten med membranteknik. Sweden.
Hellman, M H. 1994. "De-aeration of feedwater by membrane-technique; Avgasning av spaedvatten med membranteknik." Sweden.
@misc{etde_10114468,
title = {De-aeration of feedwater by membrane-technique; Avgasning av spaedvatten med membranteknik}
author = {Hellman, M H}
abstractNote = {District heating systems and boilers should to be fed with de-aerated water to prevent corrosion. The water can be de-aerated chemically or thermally by heating with hot water or steam. Society`s increased environmental consciousness demands that industry reduce the use of chemicals. A DOR plant for de-aeration of feedwater to the district heating system has been installed for evaluation at the district heating plant in Mora. The DOR plant is build on a so-called DOR membrane concept (Dissolved Oxygen Removing) that uses a vacuum system and no chemicals. This report describes the evaluation of the DOR plant. The test show that the DOR plant can produce water with a very low oxygen content. The deciding factor for how low the oxygen content will be depends on the capacity of the vacuum pump. The temperature of the water is also very important. The lower the temperature the less the oxygen content. It was impossible to establish the lowest possible oxygen content as the vacuum pump began to cavitate at a pressure of 30-40 mbar. During the test the lowest oxygen content of 9 {mu}g O{sub 2}/kg at 15 degrees C was achieved. However at this level the pump cavitated seriously. By connecting an ejector in front of the vacuum pump it is possible to decrease the pressure to 10 mbar without cavitation. A realistic result at normal condition with a pressure of 20 mbar and a water temperature of 15 degrees C would be 10-20 {mu}g O{sub 2}/kg or even lower. A plant with a DOR membrane is an interesting alternative for de-aeration of feedwater in plants without access to steam. The equipment is easy to handle and requires a minimum of maintenance. 3 refs, 9 figs, 1 tab}
place = {Sweden}
year = {1994}
month = {Dec}
}