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Improved scale conditioning agents

A technology for deposits and fouling, which is applied in the field of fouling conditioning of advanced formulations, and can solve problems such as the influence of steam generator operating performance

Inactive Publication Date: 2006-12-06
WESTINGHOUSE ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over time, this buildup of dirt and sludge will negatively impact the steam generator's operational performance

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] Preferred embodiments of the present invention are particularly useful in assisting in the removal of deposits from the secondary side of a nuclear steam generator. In operation, hot radiant water from the reactor core flows through the inside of the heat exchanger tubes, transporting most of its heat through the tube walls and into the non-radiative water surrounding these tubes. This causes the water to boil non-radiatively and produces steam that is used to generate electricity. During boiling, dirt, sludge, and other deposits accumulate on free-span tube surfaces, in gaps between tube support plates and tube walls, in vanes within support plates, and on horizontal surfaces such as tube sheets and upper portions of support plates On the surface. Chemical analysis has shown that the major components of sludge, pipe fouling, and other secondary flank deposits are magnetite, with some traces of copper, copper oxide, and siliceous minerals.

[0013] The cleaning soluti...

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Abstract

An improved scale conditioning composition and method is disclosed that results in improved dissolution and disruption of tube scale, hardened sludge and other deposits composed primarily of highly densified magnetite such as those found in heat exchange vessels, particularly steam generators. After treatment with the advanced scale conditioning composition, these magnetite rich deposits are more easily removed using known and commercially available high pressure hydro-mechanical cleaning techniques. The present invention further provides effective cleaning in a short period of time and at relatively low temperatures, while reducing the amount of waste produced and reducing the resulting corrosion of carbon and low alloy steel components within the steam generator during the cleaning process.

Description

technical field [0001] The present invention relates to a method of foul conditioning of advanced formulations and a composition for improved removal of film, scale and sludge deposits from industrial process vessels such as shell and tube heat exchangers, boilers and steam generators. Background technique [0002] Metal surfaces exposed to water or aqueous solutions for extended periods of time in closed heat exchange systems can become fouled and / or become covered with sludge and other deposits independently of the purity level of the water in the system. For example, in industrial power plants, large shell-and-tube heat exchangers, such as those known as nuclear steam Sticky scale and / or sludge deposits form on secondary sides of plates, tube support plates, and other internal components. These nasty scales and deposits can form even where the purity of the water can be controlled at or below parts per million levels. Over time, this buildup of fouling and sludge will n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D1/66G21F9/28F28G9/00B08B9/027B08B3/08B08B3/10C02F5/12C11D3/22C11D3/26C11D10/02C23F14/02C23G1/08F28G7/00
CPCF28G7/00C23F14/02C02F5/12C02F2301/046C02F2103/023G21F9/28F28G9/00C23G1/088C23G1/19
Inventor M·W·鲁萨姆R·D·小瓦林
Owner WESTINGHOUSE ELECTRIC CORP