DE1963229A1 - Process for cleaning the fire side of steam boilers - Google Patents

Description

Henkel & Cie GmbH Düsseldorf, December 16, 2019 69

Patent department Henke1str. Sl

Dr.Ar/Ge

196.3223 *

Patent application D 3964

"Procedure for cleaning steam boilers on the fire side ¹¹

The invention relates to a method for cleaning steam boilers on the fire side using neutral Emulsion cleaners.

It is known that steam boilers heated with oil or coal need to be cleaned from time to time. Since the dirt adheres strongly, it is generally necessary to have a To be cleaned with mechanical means. To support the cleaning, one has already tried with acidic or alkaline agents to support the cleaning process. "

It has now been found that one can purify by fire Steam boilers can also perform with neutral emulsion cleaners "if one follows the procedure outlined below served. The new method is characterized in that the boiler is sprayed with a neutral emulsion cleaner at temperatures of 5 to 50 ° C and then treated sprayed with water, working with a pressure of 30 to 100, preferably 40 to 60 atmospheres.

The treatment in the spray process is carried out with known apparatus Devices carried out, advantageously one or several spray arms with movable nozzles are inserted into the boiler.

The concentration of the neutral emulsion cleaner is determined to some extent according to the degree of pollution. In general

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Concentrations of 3 to 20% by weight , preferably 5 to 15% by weight, are used. It is often advantageous to let the emulsion cleaner work for about 10 to 60 minutes before hosing it off ”.

Another preferred embodiment is that the treatment with the neutral emulsion cleaners in several intervals, for example at intervals of 5 to 20 minutes. This allows the cleaning t effect can be reinforced. Following the above The described treatment with the neutral emulsion cleaner is carried out by spraying the furnace chamber with water a pressure of 30 to 100, preferably MO to 60 atmospheres.

The entering the application-neutral emulsion cleaner containing as the organic solvent hydrocarbons, especially aromatic hydrocarbons with a boiling range of 16O to 250 ⁰ C. Further constituents are in particular anionic and non-ionic wetting agents and emulsifiers. Preferably, reaction products of ethylene oxide with fatty alcohols, fatty acids, fatty amines and alkyl phenols • (number of carbon atoms in each case C ₁₂ to C ^ n) f and fatty acid alkanolamines into consideration. For example, alkylbenzenesulfonates with 8 to 15 carbon atoms in the alkyl radical are used as anion-active wetting agents. The neutral aqueous cleaners generally contain from 3 to 30 wt .- #, preferably 5 to 15 wt -.% Wetting agents or emulsifiers .. and 70 to 97 wt -.%, Preferably ₃ 85 to 95 weight ..- 55, organic solvent. These concentrates can also contain small amounts of water. Commercially available emulsion cleaners, some of which have already been diluted with water, can also be used instead of the concentrates. It

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However, it must be ensured that the concentration at the cleaning process is in the specified range of 3 to 20 wt.

In some cases it has been found useful to use im After the hosing down, passivation with aqueous solutions can be carried out in order to corrode the bare metal surfaces to prevent.

Passivation with aqueous solutions can be carried out by a separate treatment. However, the passivating agents can also be added to the spray water. especially added to the last rinse. In detail, the passivation can be carried out in an acidic, alkaline or neutral manner. Preferably, a passivation is carried out with alkaline, alkali metal nitrite-containing products, the concentration is about 0.5 to 2 wt -%, and is the pH value is above..

The advantages of the new process are that a mechanical treatment to remove the impurities not applicable. The duration of treatment is also compared to the previous one known method significantly reduced. One receives after the new process bare metal surfaces, with the use of neutral emulsion cleaners an attack on the metal is prevented.

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Henkel &. Cie GmbH Silt «1} for patent application D example 1

An oil-heated steam boiler with an hourly output of 60 tons of steam is first used for about 12 minutes with a neutral emulsion cleaner at a temperature of 20 ° C and a pressure of 50 atmospheric spray. The spraying takes place in 2 intervals with an interval of 20 minutes. The emulsion cleaner contains

90 wt -.% Aromatic hydrocarbons with a

Boiling range from 170 to 210 ^° C

3 "of a reaction product of nonylphenol with 8 moles of ethylene oxide

3 "dodecylbenzenesulfonic acid in the form of the

Triethanolamine salt

4 "fatty acid ethanolamide

This emulsion cleaner was in a corresponding Sprayer diluted 1:10 with water. After treatment with the neutral emulsion cleaner was the boiler room 20 minutes later, hosed down with water, keeping the pressure 50 atm.

This was followed by passivation with an aqueous solution containing 0.8 wt -.% Of an alkaline sodium nitrite solution having a pH value of about 11 containing.

After this treatment were in the entire furnace the impurities are removed and a bare, corrosion-protected metal surface is restored.

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Henkel & Cie GmbH S »! T. 5 ^Iur P ° lentanm «ldung D 3964 Example 2

For cleaning the fire side of an oil-heated steam boiler with an hourly output of 40 t of steam, this becomes 15 minutes with a neutral emulsion cleaner at a temperature of 15 ° C and a pressure of 60 atmospheres Treated by spraying. The emulsion cleaner contains

94 wt -.% Aromatic hydrocarbons with a

Boiling range from 180 to 220 ° C. 3 "of a reaction product of nonylphenol

with 6 moles of ethylene oxide 2 "Pettsäureäthanolamid 1 "alkylbenzenesulfonic acid in the form of the alkanol

amine salt

This emulsion cleaner was in a corresponding Sprayer diluted with water in a ratio of 1: 12.5. Of the so treated kettle was left to stand for 45 minutes and thereafter hosed down with water, the pressure being 60 atmospheres. There were in the entire furnace after this treatment removes the impurities and creates a bare metal surface. -

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Claims (6)

Henkel & Cia GmbH Seit · g xur Potentanm «ldun _a D 39 6 ^ i Claims / L) yVerfahren to feuerseitlgen cleaning steam boilers, characterized in that one treats the boiler by spraying with a neutral emulsion cleaner at temperatures of 5 to 50 ⁰ C and then squirts with water, wherein each working atmospheres with a pressure of 30 to 100 . 2) Method according to claim I _3, characterized in that "the boiler with a neutral emulsion cleaner, the concentration of which is 3 to 20, preferably 5 to 15 wt .- #, is treated by spraying. 3) Method according to claim 1 and 2, characterized in that the boiler with a neutral aqueous cleaners, of 3 to 30 wt -.% Non-ionic and anionic wetting agents or emulsifiers, and from 70 to 97 wt .- # aromatic hydrocarbons having a boiling range of Contains 160 to 250 °, treated by spraying. _m 4) Method according to claim 1 to 3, characterized in that ) the neutral emulsion cleaner is allowed to act for about 10 to 60 minutes before being sprayed off. 5) Method according to claim i to *}, characterized in that that the treatment with the neutral emulsion cleaner performs at several intervals. - 7th 1 0 9 0 2 6 / Π 5 a ■ ■> BATH ORIGINAL Henkel & Cie GmbH si ». J «r Pai« ntonm »idun _e D 39 6 ty 6) Method according to claim 1 to 5, characterized in that that after hosing down a passivation with aqueous, preferably alkaline, alkali metal nitrite-containing Solutions. . Henkel & Cie. GmbH i.V. ■ / ■ Jl. (Dr. Haas) .-. (Dr. Arnold ^) 109826/0583