DE3005517A1 - METHOD FOR CLEANING BOILERS OR OVENS - Google Patents

Description

Josef Krammer

Chem. Steam boiler cleaning

Black way 1 5

4040 Neuss

Procedure for cleaning boilers or furnaces

The invention relates to a method for cleaning boilers or ovens on the flue gas side using ammonia vapors, especially hot ammonia water vapors, where water is injected into the fire and flue gas flues or is sprayed.

Such a method is known from DE-AS 27 02 716. In this known method, care must be taken be that the pH of the drained dirty water does not fall below 7.4, otherwise the The boiler or the furnace as well as the masonry would be attacked by the acidic dirty water. Furthermore, sour Wastewater does not enter the sewer. M.in met this requirement by made sure that at the beginning of the introduction of ammonic water vapor no water was sprayed in and after about two hours only a little water and then continuously increasing. If the pH value fell below 7 or 7.4 with this known method, it was again stronger or steamed again with ammonia, so that

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the pH of the dirty water rose again. This renewed or stronger steaming with ammonia was for them Workers are particularly a hindrance if it fell into the phase in which they were only rinsed with water or was rinsed, as in this phase the workers easily came into contact with the ammonia. Further was the constant measurement of the dirty water and the corresponding adjustment of the supply of ammonia vapors labor-intensive and cumbersome.

The object of the invention is to provide a method of the above to improve said type in such a way that it is inexpensive and easy to use with great simplicity is, has a high level of occupational safety and the cleaning effect is increased.

According to the invention, this object is achieved by adding a base to the water, in particular in the form of a concentrated one Solution (lye) is added, the amount and / or concentration of which depends on the pH value of the waste water flowing off.

In the method according to the invention, it is not necessary add ammonia vapors to the boiler or furnace to increase the pH of the dirty water. Instead, an inexpensive lye is added to the water to be sprayed, so that work safety is increased and costs are reduced. Controlling or regulating the addition of lye to the water is much simpler and easier to handle than a regulated input of ammonia vapors, and furthermore the cleaning effect is enhanced by the addition of lye elevated.

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Soda, magnesium dioxide, calcium, lime or ammonia are preferably used as the base. Furthermore, a device recommended for carrying out the method in which a control device is provided that the Measures the pH value in the draining dirty water and controls the addition of base into the water accordingly. This significantly reduces the amount of work and makes the process cheaper, since only the absolutely necessary required amount of base or lye is supplied.

An embodiment of the method according to the invention is described in more detail below.

If a boiler or furnace is to be cleaned inside, openings in the boiler or furnace wall are used Injectors pushed into the combustion chamber and possibly into the adjoining heating flues, through which hot ammonia vapors are atomized. While these injectors essentially go through in the lower area horizontal openings are introduced, so that the steam flows from the bottom upwards, are through upper openings Sprinklers or rotating blasting nozzles introduced in the boiler or furnace room or in the heating flues Spray water from top to bottom.

First, only hot ammonia vapors are introduced into the interior for about 1 to 3 hours, and then is the spray water is sprayed in depending on the cleaning effect. With the amount of water to be sprayed There is no need to pay attention to the pH value of the draining waste water, as it is in the water supply line (s) Dosing devices for a lye

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BATH ORIGINAL

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Water with soda, magnesium dioxide or calcium or lime is arranged, which is controlled by a measuring device that measures the pH in the dirty water and according to the lye added to the water to be sprayed,

The approximately 10-hour phase of simultaneous spraying of water and the introduction of ammonia vapors is followed by a rinsing phase in which a higher amount of water is sprayed on. This The amount of water can also be added with the same dosing device to improve the cleaning power to increase further. It is important that also during the previous spraying of water the added lye improves the cleaning effect.

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Claims (1)

COHAUSZ & FLORACK PATKNT TO WALT8BÜKO SCHUMANNSTR. 97. D-4000 DÜSSELDORF Telephone: (02 11) 68 33 46 Telex: 0858 6513 cop d PATENT LAWYERS:
Dipl.-Ing. W. COHAUSZ Dipl Ing. R. KNAUF · Dr.-Ing., D pl.-Wirlsch.-lrig. A. GERBER ■ Dipl.-Ing. HB COHAUSZ January 28, 80 Expectations [1.) Procedure for cleaning boilers on the flue gas side ^ - ^ or ovens caused by ammonia vapors, especially hot ones Ammonia water vapors, in which water is injected or sprayed into the fire and flue gas flues, characterized in that the water has a base, in particular in the form of a concentrated solution (lye) is added, the amount and / or concentration of which depends on the pH value of the draining dirty water. 2. The method according to claim 1, characterized in that the base soda, magnesium dioxide, Lime or ammonia is used. 3. Device for performing the method according to claim 1 or 2, characterized that a control device is provided that the pH value in the draining dirty water measures and controls the addition of base in the water accordingly. 34 033 - 2 - HC / Be 130034/0411 ! / v'Ur »-