FI63293B - ANORDING FOR SPRUTING AV SYLING PAO DEN YTTRE YTAN AV ENGN ELLER LIKNANDE - Google Patents

Description

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Patent · odt ragictantyralam 7 An »ök * n utitgd och utkikriftM pubiinnd jj-.ux.oj (32) (33) (31) Pyydetty acuolk« ui prlorltut (71) Outokumpu Oy, Outokumpu, FI; Töölönkatu 4, 00100 Helsinki 10,

Suomi-Finland (FI) (72) Ääret Veli Pellervo Ropponen, Harjavalta, Suomi-Finland (Fl) (7M Berggren Oy Ab (5 * 0 Apparatus for spraying cooling water to the outside of an oven or the like - ugn eller liknande

The present invention relates to a surface cooling device for spraying cooling water on the outer surface of an oven or the like.

Industrial furnaces operating at high temperatures require the so-called surface cooling to protect the refractory masonry of the furnace by means of a steel jacket.

Surface cooling of industrial furnaces is usually carried out by comb tube devices consisting of cooling coils circulating in the furnace. In such refrigeration equipment, the cooling water is circulated under pressure, whereby the equipment includes a booster pump with associated piping. The equipment also requires garbage screens, filters and mud separators in the water supply line. Nonetheless, contaminants flow through the mud separators, causing blockages in the comb tubes. The maintenance of sludge separators and their freezing in winter incur costs.

For surface cooling, a pressurized pipe and a smooth flow plate connected to it (SU inventor certificate 330318) are shown. The distribution of water on the plate is effected by drilling holes in the pipe from which water flows into the plate. The holes are quite small and thus 2,63293 prone to blockages, in addition to which the installation tolerance of the smooth flow plate is quite small. GB 1 251 168 discloses a surface cooling device with a distribution box and a flow plate, the lower part of which is a flexible material. The installation of the lower part of the flow plate on the side of the oven is backlash-free and only the pressure of the water acting on it opens the drain hole. The construction of such a plate is somewhat complicated, in addition to which installation on the side of the furnace is a precise operation.

The present invention provides a surface cooling device which does not have the above-mentioned disadvantages, has at least one normal pressure cooling water distribution box arranged next to the upper edge of the cooling zone and obliquely downwardly directed plates connected to the distribution box, and is characterized in that the obliquely downwardly formed into troughs to accelerate the flow rate of cooling water flowing from the junction box before spraying it on the surface to be cooled.

The surface cooling device according to the invention operates without pressure, whereby considerable advantages are achieved compared to previously used cooling devices. In this case, purchase, installation and maintenance are excluded for the following devices: booster pump plus motor spare pump plus motor piping and valves for the previous sludge separators for the previous ones installed in the pressure piping.

The electric motor of the booster pump is continuously powered, so the annual energy savings are considerable if the booster pump can be removed from the refrigeration system.

In addition to what has been mentioned above about cost savings, the new cooling device also provides great benefits in terms of reliability and maintenance costs.

The invention is described in more detail below with the aid of the accompanying drawings, in which Fig. 1 shows a surface cooling device seen from the side, Fig. 2 shows a gutter plate seen from above, Fig. 3 shows a gutter plate seen from the side.

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Figure 1 shows a surface cooling device according to the invention, and it shows that the surface cooling unit is a trough-like water distribution box 1. The water distribution box 1 is open at the top but can also be provided with a removable protective cover. The cooling water is led to the surface cooling unit from the body pipe 2 circulating the furnace or reaction shaft. The pipes provided with shut-off valves 3 connect the body pipe 2 and each distribution box 1 separately. The adjustable bracket 8 at both ends of the water distribution box 1 allows for easy installation of the cooling unit and locking after leveling adjustment. The cooling water inlet pressure must be low, as the operation of the surface cooling unit does not require pressurized cooling water. A considerable advantage of low-pressure cooling water is that the shut-off valves 3 for the distribution boxes 1 can be kept almost completely open. Then the debris and sludge-like substances that accompany the cooling water can pass through unhindered.

The most essential parts of the cooling device according to the invention are the troughs 6 'shown in Figure 2. The gutters 6 ', which are directed obliquely downwards approximately towards the upper edge of the cooling zone, receive the cooling water flowing from the distribution boxes 1. The troughs 6 'are in a device for accelerating the flow rate of cooling water before it is sprayed onto the surface to be cooled 7. According to a preferred embodiment of the invention, the troughs 6' form a unitary trough plate 6 and are set at an angle of 40-50 °, preferably about 45 °.

It can be seen from Figure 3, which shows the gutter plate 6 from the side, that the water, having collected the flow rate on the gutter plate 6, continues to move in the air with a jet arc to the cooling object 7. The water flows smoothly and calmly The gutters do not have to be attached to the surface to be cooled and this facilitates the installation work. The lower edge of the gutters 6 'can be about 30 mm and preferably at least 10 others away from the surface 7 to be cooled. As can be seen in Figure 3, a dam plate 4 can be placed between the water distribution boxes 1 and the gutter plate 6, distributing the water evenly over the gutter plates 6.