DD135534B1 - A method of providing a variable concentration neutralizing agent - Google Patents

Description

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Title of the ffrfiridung

Method of providing a neutralizing agent of variable concentration.

Field of application of the invention

Bio application of the invention preferably extends to the cleaning of the heating surfaces of oil-fired steam generators and the downstream heating surfaces »

The application is also suitable for other neutralization operations characterized by the need for neutralizing agents of decreasing concentration.

C characteristic of the known technical solutions

The heating surfaces of the oil-fired steam generator and the Nachschaltheizflachen be cleaned in the temperature ranges up to 80 ⁰ C and the V / asserstrahl or spraying with a basic solution of constant concentration with and without additional chemical additives. The known methods have the disadvantage that at the time of reactivity of the sulfur oxides contained in the deposits by wetting Mt water no or too low Neatramittelkontakt to prevent corrosion on unprotected steel is present.

In the hitherto conventional methods, only the use of caustic soda, potassium hydroxide solution or lime milk was possible, which prevented the corrosion only incompletely. The use of water or dilute sodium hydroxide or potassium hydroxide solution of constant concentration also leads to an acidic,

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Steel- and concrete-aggressive or a basic alkaline wastewater »Separate neutralization of the wastewater is required in both cases.

Object of the invention

The aim of the invention is to purify the cleaning element in a targeted manner with a concentration corresponding to the reactivity of the sulfur oxides contained in the deposits.

When cleaning appropriate plaques the highest Heutralisationsmittelbedarf coincides with the beginning of wetting. Thereafter, it falls according to the progress of the cleaning process from _t since the compounds to be neutralized with the'Ablagerungen be rinsed from the surfaces or ', are neutralized,

The invention takes account of this course, in which it makes it possible to design the Keutralisationsmittelangebot su.

Depending on the type of chemical constituents, different neutralizing agents can be used,

Explanation of the essence of the invention

Hex invention is based on corrosion damage to the heating surfaces are prevented by chemical influences due to the maximum Ileutralisationsmittelangebotes at the time of wetting, with the neutrality of the wastewater can be maintained throughout. The discharge into corrosion-resistant pipelines and cleaning plants can be dispensed with »

Use of lime milk becomes possible, whereby an improved treatment of the sludge is achieved. The addition of other additives for .Entering side effects is given, »

In a pressure vessel with a RUhrgerät the amount of Netturallaationamittela which corresponds to the need for neutralization of the application area is mixed with 7 / sa.

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The mixing process must be carried out during the entire operating period »

The container is ao integrated into a pipeline, that a pipe string in the container, a second pipe string is guided around this.

The outlet of the tank and the by-pass line are combined in a control valve and discharge into the line виг extraction point,

With the beginning of the mixture decrease, the inflowing water presses the neutralizing agent into the decrease and at the same time reduces its concentration by dilution,

The ratio of the dosing quantity thus obtained to 7 / assermonge is set with the control valve. If the quantity of dosing remains constant, the concentration in the container and thus in the withdrawal line decreases

Augführungsbeiaplel

Pur the application of the invention, an aggregate is required, which consists of a pressure vessel "1) with stirrer (2), aen Schiobern (3-5), the control valve (6) and the required piping and pipe connections.

This unit is fixed or flexible connected to the hot water line and introduced the required amount of hydrated lime in the stirred tank.

The slide (3) to the pressure vessel (1) is opened and this filled under pressure · Then the stirrer (2) is turned on and the lime is mixed with the water to milk of lime.

Now, the slide (4) is opened to release the umachlußleitung and set the mixing ratio on the control valve (G). With the opening of the slide (5) the Abspritsvorgang is introduced via the previously mounted on the pressure side hose.

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With the lateral flow of the Abspritzens the Kalkmilchdosierung reduced by mixing with the inflowing water in the pressure vessel (1) until a final rinse with clear water takes place.

The process is ended by closing the slides (3-5) and discharging the residual water from the pressure vessel (1) »

Bas aggregate can be used stationary for a heating plant or portable for several heating plants according to territorial criteria »

A possible overdose when using lime milk is not important. The excess lime also precipitates in the sludge as a pesticide. It has the advantage that in the event of uneven spraying, non-neutralized inactive substances are subsequently bound. "

Claims (3)

- 5- 204 825 inventionaapruch 1, Method for the preparation of a neutralization agent with variable concentration according to the technical requirements, characterized in that, starting from a maximum by means of a pressure vessel (1) and agitators (г) concentration is achieved by dilution with water, the dilution constant medium a set valves (6) can be adjusted 2 method according to item 1, characterized in that different chemicals can be used, 3 · Process according to item 1, characterized in that the emulsion is prepared and used under pressure « For this 1 page drawing