SU872552A1 - Plate cooler of metallurgical sets - Google Patents

Description

one

The invention relates to the cooling of equipment, for example metallurgical aggregates, and can be used in ferrous and non-ferrous metallurgy.

A refrigerator for metallurgical shaft furnaces is known, consisting of a metal plate with curved heat pipes poured in it, like a pipe in a pipe, connected to a condensation chamber, which is provided with a partition attached in its lower part with a hole connected to the inner standpipe tl.

The disadvantages of such a cooler are following: the cooler and the condensation chamber are spatially separated, which complicates its design, extends the transport path of the condensate coolant from the condensation zone to the working one, casting is used to manufacture the cooler, which significantly increases its production cost.

The closest to the invention in technical essence and the achieved result is a refrigerator of metallurgical units, made in the form of a heat pipe with a capillary coating and with packages of cooling pipes G2 placed inside the plate.

However, this refrigerator can operate at moderate heat loads, i.e. when the evaporation rate does not exceed the rate of raising the coolant through the capillary, the heating and condensation areas are comparable, which also creates a restriction on the transferred heat flux, combining several heat pipes with one cooling pipe leads to sequential heating of the cooling agent and, consequently, to a decrease in cooling efficiency heat pipes that follow along the cooling agent; for heat removal from a large area, a proportional increase in the number of heat pipes is required, which makes it difficult and significantly increases the cost of construction.

The aim of the invention is to increase the cooling efficiency.

The goal is achieved by the fact that the PLATE refrigerator is made in the form of a heat pipe with a capillary coating and with packages of cooling tubes placed inside the stove, while the stove is equipped with a screen installed in the space between the bottom

The chambers and cooling tubes, in which the screen has a slope of the bottom side of the cooled area and installed with a gap relative to the end walls of the heat chamber.

FIG. 1 is a schematic representation of a cooling element; in fig. 2 a cut A-A in FIG. one; in fig. 3-4 dyne of the embodiments of the cooling element; in fig. 5-6 is a device for sealing the electrode gap of an electric furnace in which a cooling element is installed.

The cooling element (fig. 1-4,) consists of a sealed case 1, a freezer 2 in the form of a tube bundle, ribs 3, a screen 4 with a guide 5, a transport channel 6, a wall 7 of the cooling element, partitions 8. The cooling element of the sealing device electrode gaps consists of a hermetic body 1, a refrigerator 2 in the form of a tube bundle, ribs 3, a screen 4 with a guide 5, a transport channel b, a wall 7 of a cooling element, partitions 8, a projection 9 of a cooling element, a sealing ring 10, a carriage 11, a plate 12.

The cooling element (Fig. 1-4) is made in the form of a sealed enclosure 1, partially filled with an intermediate coolant. Inside the cooling element, there is a cooler 2 in the form of a tube bundle, on the bottom on the ribs 3 a screen 4 is installed with a guide 5 forming the transport channel 6 together with the wall 7 of the housing. The guide 5 of the screen 4 repeats the form of the wall 7 of the housing. The transport channel can be divided by partitions 8.

The ribs 3 can be rigidly connected to the bottom of the cooling element or to the screen 4.

FIG. 1-6 the cooled wall of the element is shown as vertical. In general, the shape of the wall and its angle of inclination are not limited either by its profile or inclination in one direction or another, except for its horizontal position.

In addition, the ratio of the horizontal surface, i.e. the heating area (in this case, the bottom of the cooling element) and the non-horizontal (in this case, the vertical wall of the cooling element) may be different.

 Refrigerators can be connected both in series and in parallel.

The amount of intermediate coolant is selected based on the available experimental data.

The necessary ratio of the evaporation surface areas (in this case, the bottom of the cooling element) and the condensation surface (in this

In the case of a refrigerator in the form of a tube bundle, in each particular case, it is selected based on the density of the heat flow p in the heating zone, the operating pressure P in the sealed cavity and the saturation temperature of the intermediate heat transfer medium corresponding to this pressure, heat transfer coefficient in the boiling zone and condensation of the intermediate heat transfer fluid and t .d

With sufficient accuracy for engineering calculations in this case, the heat transfer equation can be written as.

) t

whence the ratio of condensation and heating areas is equal to

4n

ci- HML n O

where - cond - heat transfer coefficient

in the condensation zone which

then

PH k ioHAttH- o

If we assume that the heat flux density is 350. 10 W / m, the heat transfer coefficient to VL is 1500 W / m.h., the water inlet temperature is t (7 1 ° (1, pressure in the sealed chamber P 1 at. СЬ, 100 ° Hundred

con iSO- -10

 2.5

PH 1500 (-100-7;

those. The ratio of heating and condensation areas is 1: 2.5.

The cooling element operates as follows.

When heat flows to the housing 1 of the cooling element and the vertical walls 7, the coolant, for example water, is heated to (the evaporation temperature changes its state of aggregation and along the surface of the screen 4 from the evaporation zone in the form of steam enters the transport channel b formed by the screen 5 and the vertical wall 7 of the cooling element, where the airlift effect of raising the coolant against the force of gravity in the form of a mixture of vapor and liquid occurs, thus achieving heat removal from the wall 7 of the cooling element.

The screen at the same time allows to collect steam with a sufficiently large

surface evaporation and implement its organizational movement through the transport channel.

Then the coolant in the form of vapor and liquid from the transport channel

6 through the gap between the guide 5 of the screen: on 4 and the lid of the cooling element enters the vapor condensation zone located above the screen, where the refrigerator 2 is in the form of a bundle of pipes, through which a cooling agent circulates, such as running water. In this zone, the coolant entering as vapor condenses on the surface of the pipes of the refrigerator. Tilted screen surface together

with the coolant sprayed through the transport channel 6 in the form of a liquid through the gap formed by the screen and the vertical wall of the cooling element (Fig. 1) or through the gap between the screens (Fig. 3) / the condensate again enters the evaporation zone. The cycle is then repeated regularly.

To provide organized movement of steam along the transport channel 6, the latter can be separated from the zone by additional partitions 8 installed between the guide 5 of the screen 4 and the wall 7 of the cooling element.

As an example of the application of the invention in FIG. 5.6 is an inoculation device for sealing the electrode gaps.

The device consists of detachable, for example, four cooling elements, with a refrigerator 2 arranged inside it in the form of a tube bundle, at which on the bottom of the case on fan-shaped ribs 3 is installed at a positive angle to it and with an opening angle towards the electrode, a screen 4 with a guide 5, repeat the way the shape of the near-electrode wall

7korpusa at its height, while the inner space of the element is divided by the screen 4 into zones interconnected by a lockNM and the transport channel 6 of the coolant.

On the protrusions 9 of the cooling elements, segments of refractory material are placed along the perimeter of the electrode, forming a sealing ring, which is pressed by means of plates 12, the cooling elements connected to the carriages 11 moving along cantilever beams

ovens. The bottoms of the organized vapor pressure transport channel 6 of the cooling element can be divided into zones by additional partitions 8 installed between the guide 5 of the screen 4 and the wall 7 of the cooling element.

The use of the proposed element of the invention allows to significantly increase the reliability and efficiency of cooling the metallurgical plants and its individual components. Because . the evaporation and condensation zones are not separated spatially, the evaporation-condensation cycle and the transportation of condensate to the evaporation zone occurs in a short period of time, which in cooling devices is a limiting element in the type of heat pipes.

The element is self-regulating. 1 - Increasing the proportion of coolant.

0 in the liquid state allows proportionally increasing the amount of heat removal from the unit. The heating surface. The ratio of areas (horizontal and non-horizontal) can be different and does not limit the cooling process. The shape of the non-horizontal wall and its angle of inclination are not limited either by the profile or by its inclination in one direction or another, which allows for the cooling of complex circuits.

Claims (2)

1. Author's certificate of the USSR 499300, cl. From 21 to 7/10, 1974. 2. USSR author's certificate 541862, class, C 21B 7/00, 1975. one t i (( A M i V f 5 aa FIG. 6