DE3339734C1 - Plate cooler for metallurgical furnaces, especially blast furnaces - Google Patents

Abstract

1. Plate cooler made from cast material with integrally cast cooling pipes for the water cooling of metallurgical furnaces, particularly blast furnaces, characterized in that the cooling pipes (2) have at the inlet and outlet a circular cross-section and in the straight part within the cooler an oval cross-section, the axial ratio b:a in the oval section being between 1:1,2 and 1:15.

Description

for flattened cross-sections.

According to FIG. 1 have the cooling tubes 2 going into the plate cooler body 1 are cast in a circular cross-section. At the inlet and outlet of the cooling pipes 2 in the plate cooler body 1, these are surrounded by protective tubes 3, which are also cast. The hot side of the plate cooler facing the metallurgical furnace is denoted by 4. F i g. 1 documented the state of the art.

Fig.2 shows in the straight part of the plate cooler body 1 cooling tubes 2 with an elliptical cross section. On the left half of F i g. 2 is the transition of the cooling pipes shown from the circular to the elliptical cross-section within the plate cooler body.

F i g. 3 and 4 show arrangements of cooling tubes 2 with an elongated round cross-section. According to FIG. 4 are the Cooling tubes 2 arranged pivoted at their distance from the hot side 4 of the plate cooler at an angle of approximately 45 °. This arrangement improves the temperature and voltage conditions in the plate cooler.

For this purpose 3 sheets of drawings

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Claims (2)

1 2 was reduced accordingly. Patent claims: The previously described further development measures 1. Plate coolers made of cast material with poured in brought the desired success by nen cooling tubes for water cooling of metal- 5 with increasing the diameter of the cooling tubes lurgical furnaces, especially blast furnaces, since the cooling surface increased proportionally, but at the same time characterized in that the cooling tubes became with increasing cooling tube diameter the transverse (2) At least in the straight part within the cooler, the cooling pipes cut by an increased square. Since now at (1) an oblong, in particular elliptical of the water cooling compliance with a certain or have an ellipse-like cross-section. io water speed is required to allow entry 2. Plate cooler according to claim 1, characterized in avoiding film boiling under heavy loads, indicates that the axial ratio b : a when the water velocity in the cooling tubes had to have an oblong cross-section between 1: 1.2 to at least 1.2 to 1, 5 m / sec and therefore ent-1:15, preferably between 1: 3 to 1: 8. corresponding to the enlarged cooling tube diameter 3. Plate cooler according to claims 1 and 2, da- 15 ne disproportionately increasing amount of cooling water in characterized in that the major axis (5) of the purchase are taken. Oblong cross-section parallel to the hot side Due to such high amounts of cooling water had to (4) of the plate cooler (1) is cast. the inlet and outlet pipe cross-sections, the drycooler 4. Plate cooler according to claims 1 and 2, da- dimensions, the pump dimensions and drive through characterized in that the large axis (5) of the 20 outputs of the pumps correspondingly enlarged werlängenrunden Cross-section at an angle between. This had to be done, although on the other hand it was Swiveled 1 ° and 45 ° to the hot side (4) of the type high cooling water quantities from the heat supply Plate cooler (1) cast is not required at all, i.e. the heating-up span 5. Plate cooler according to claims 1 to 4, that the cooling water is far less than that of the characterized in that adjacent poured 25 water quality would be permissible. ne cooling tubes (2) in their distance from the hot side (4) The object of the invention was therefore to find a way of the plate cooler (1) are arranged offset. search, as with unchanged cooling surface, d. H. unchanged The cross section of the surface of the cooling tube can be reduced. 30 This object is achieved according to the invention in the manner solved that the cooling tubes at least in the straight part The invention relates to a plate cooler made of cast within the cooler an elongated, in particular material with cast-in cooling tubes for the water with an elliptical or elliptical cross-section cooling of metallurgical furnaces, especially high-temperature furnaces, ovens. 35 Further embodiments of the invention are counter- Well-known plate coolers or "stave cooler" existed as sub-claims. from a cast iron body in which steel pipes are attached are by which a coolant, that is to say in the shaped cross-section of the cooling tubes, is insignificant. So In most cases water or a water vapor-water increases z. B. at a water speed of Mixture flows. The cross section of the cooling tubes is circular 40 1.5 m / sec and a transition from the round tube with shaped. The cast body of the plate cooler often has an outer diameter of 76.1 mm and a wall thickness of 6.3 mm on the side facing the interior of the window there is a recess an elliptical tube with an axis ratio (ingen for the introduction of refractory material. nen) 1: 3 from 48 mm WS to 66 mm WS per running meter, i.e. H. around The known plate coolers are in the course of the last approx. 40%. For a 15 m long pipe, the result is dieten It has been further developed for 15 years to give its owners an additional pressure loss of only about 45 operational reliability and thermal load capacity up to 270 mm WS. This additional amount can be improved in practice. To increase the thermal load capacity negligibly. The throughput of water is reduced one has a. label the path, the diameter of which is 35%. To enlarge cooling tubes, thereby the ratio Since it is sufficient if the cooling tubes only in their To increase the cooling surface to the heating surface. As the cooling surface 50, the straight part inside the cooler became an elongated run the outer surface of the cooling tubes in the straight part has the elliptical or elliptical cross-section inside of the plate cooler called, sit as a heating surface, while the cooling pipe inlet and outlet one the front of the plate facing the inside of the furnace has a circular cross-section, the manufacturer cooler, development of the welded connections to the external piping Cooling tubes in plate coolers with enlarged 55 facilitated. Diameter cause a lowering of the plates. In the drawing, some exemplary embodiments are shown cooler temperature with a constant heat bath of the invention. It shows
stung, or they have an increase in the transferable Fig. 1 a section of a conventional plate heat flow with constant maximum temperature cooler with circular cooling tubes,
doors result. This is done for the following reason: FIG. 2 shows a section of a plate cooler according to the invention with cooling tubes of an elliptical cross section, 1. the larger cooling tube diameter cuts the figure. exercise in the steepest part. 4 shows a section of a plate cooler with cooling 2. It is the one with a relatively high specific 65 tubes oblong cross-section, which is angled to the Heat transfer resistance-afflicted excess I lissscite are inclined and transition zone cooling pipe / cast body enlarged, see Fig. 5 in a diagram the change in the transverse that the integral heat transfer resistance cut surfaces as a function of the axial ratio