RU165303U1 - DEVICE FOR CARRYING OUT THE PROCESSES OF GRANULATION OF ICE IN THE CIRCULATION LAYER - Google Patents

Abstract

Apparatus for conducting ice granulation processes in a circulation layer, comprising a body with a gas distribution grill and a water nozzle, characterized in that it has a front wall with a granule splitter, a rotary bottom and a rear wall, the latter being made with the possibility of moving in contact with the rotary bottom in two directions relative to the side walls.

Description

The utility model belongs to the class of fluidized-bed apparatus that can be used to produce granular ice in the field of construction of ice facilities (dams, dams, crossings, etc.).

A known apparatus for granulating ice (patent for utility model No. 151813 "Apparatus for granulating ice", priority of 12/31/14, IPC F25C 1/00 (2006.01)) containing a box-shaped case with a nozzle and a nozzle for supplying ice crystals, an inclined bottom with a mobile gas distribution grille, as well as air supply fittings and granulate discharge.

The operation of the apparatus is carried out periodically. A portion of seed crystals is loaded into a stream of cold air and ice granules move in the form of a circulation loop. After water is supplied for irrigation, the process of freezing is conducted until the desired size of ice granules is obtained. At the end of the freezing cycle, the granulate discharge stage is carried out.

The seed crystals, after falling from a stream of cold air, roll along an inclined bottom to the grate and again fall into the stream of a fluidizing agent, in this case cold air. However, at low angles of inclination of the bottom of 25-35 degrees, some of the small seed crystals 22-28% stick to it. A so-called “false” bottom is formed, the angle of inclination of which exceeds 45 degrees and approaches 60 or more depending on the process temperature. Accordingly, the working volume of the apparatus decreases, to preserve which it is necessary to increase the height of the walls, hence the gas pressure rises and a causal chain of parameters arises, which reduces the efficiency of the apparatus. A disadvantage of the known design is the gentle slope of the bottom, below the rolling limit of the seed crystals, which upon sticking cause a drop in the working volume of the apparatus.

The objective of the utility model is to preserve the size of the working volume of the apparatus during the granulation of ice. The problem is solved due to the fact that in the apparatus for conducting ice granulation processes in the circulation layer a cracker, a rotatable bottom and a rear wall are installed, the latter moving with constant contact with the bottom in two directions relative to the side walls.

The utility model is illustrated by drawings, where:

in FIG. 1 - general view of the apparatus;

in FIG. 2 - initial position of the rear wall and bottom in the apparatus;

in FIG. 3 - the position of the rear wall at the time of water supply.

The apparatus (Fig. 1) contains a housing with a gas distribution grill 1, a front wall 2 with a granule cracker 3, and also side walls 4, between which a water nozzle 5 is mounted, a rotary-movable wall 6 and a rotary bottom 7, which are in constant contact .

The launch of the apparatus at the initial inclined position of the rotary-movable wall 6 and the rotary bottom 7 (Fig. 2) begins with the supply of cold air (three curved arrows) through the gas distribution grid 1, mounted on the housing, and at the same time load ice crystals from above. Short straight arrows show the movement of the crystals along an inclined plane down to the gas distribution grid 1, where an air stream transports the ice mass up and brings it into circulation.

After cooling the crystals to operating temperature, the rotary-movable wall 6 (Fig. 3) is raised to prevent crystals from sticking and turned into a vertical position in contact with the rotary bottom 7, and also include the supply of jet-drop water through the nozzle of the water supply 5 in the amount of 20 -30% of the face value.

When there is an increase in the content of oval-spherical granules (Fig. 1), the movement of which is shown by a large left arrow, turn on the granule splitter 3 and move the rotary-movable wall 6 and the rotary bottom 7 (the initial position is shown by a dotted line) to the leftmost working position with simultaneous increasing the water supply to the nominal value, which corresponds to the beginning of the stationary mode of operation of the apparatus. During the movement of the granules to the rotary-movable wall 6 (large arrow to the left), the irrigation water on their surface freezes and the mass of ice slides along the inclined rotary bottom 7.

The dust-like fraction of ice formed in the cracker is carried out by a gas stream to the surface of the layer and falls under irrigation with water. It has been experimentally shown that there is a process of coagulation of dust particles both between themselves and on the surface of ice granules. The phenomenon of dust sifting to the rotary bottom through the moving layer of granules and its freezing on the inclined surface of the rotary bottom is excluded.

The window for unloading granules in the side wall is not conventionally shown.

Thanks to the proposed design, the negative effect of ice formation on the rotary bottom is eliminated. The process of processing the dusty fraction of ice after the cracker, i.e. the stage of preparation of seed crystals outside the apparatus with preliminary screening of ice dust is excluded.

Claims (1)

Apparatus for carrying out granulation processes of ice in a circulation layer, comprising a housing with a gas distribution grill and a water nozzle, characterized in that it has a front wall with a granule splitter, a rotary bottom and a rear wall, the latter being made with the possibility of moving in contact with the rotary bottom in two directions relative to the side walls.

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