RU201598U1 - REAGENT-FREE EVAPORATING COOLING TOWER - Google Patents

Abstract

The reagent-free evaporative cooling tower consists of a body, a liquid supply manifold, a liquid collection tank and a fan; the body includes a sprinkler consisting of tubular elements, which are corrugated plates installed symmetrically relative to each other along the entire sprinkler height. The liquid supply manifold has two fittings, where the main flow of cooled water enters the radiator located inside the body in the form of a tubular coil, the end surfaces of which are located perpendicular to the inclined corrugated plates of the sprinkler, and the second fluid flow acts as a refrigerant and is supplied to irrigate the tubular radiator. In this case, the non-evaporated part of the liquid is pumped from the liquid collection tank back to the inlet manifold for irrigation of the cooling tower, thereby forming a closed circuit of the cooling liquid circulation. The technical result is a significant reduction in the volume of chemicals used by supplying the main part of the cooled water to the tubular radiator while maintaining high efficiency of circulating water cooling.

Description

The utility model is intended for cooling circulating water and can be used in power engineering, chemical, petrochemical, metallurgical and food industries.

Known fan cooling tower [see. patent RU 2037764, F28C 1/00, 1995], containing a housing with air intake windows in the upper part, in which a central air outlet pipe is installed, a sprinkler with centrifugal jet nozzles, the outlet openings of which are directed upward, a two-stage annular screen located above the nozzles. A distinctive feature of this device is a screw nozzle made of fabric material, located under the sprinkler.

The disadvantage of the analogue is a significant droplet entrainment caused by an increase in air velocity due to a decrease in the cross-section of the interaction zone of working media due to the air exhaust pipe installed there.

Known fan cooling tower with a circulating water supply system [see. patent RU 2659011, F28C 1/00, 2018], containing a housing, a spray device, a tank for collecting liquid and a fan. The body consists of two parts - the upper part, which includes a sprinkler and a droplet separator, between which there is a collector of a sprinkler with one-piece nozzles, and a lower part, in which a liquid collection tank is located for collecting cooled water with a fan installed on it.

The disadvantage of the analogue is the low degree of liquid redistribution over the cross-section of the cooling tower, leading to a decrease in the efficiency of the water cooling process.

The closest to the utility model in terms of the technical essence and the achieved result is a fan evaporative cooling tower with self-distribution of liquid [see. patent RU 193253, F28C 1/00, F28F 25/08, 2019], containing a housing, a manifold for supplying a liquid, a tank for collecting liquid and a fan. The body includes a sprinkler, consisting of tubular elements welded to each other along the end surfaces. Tubular elements are corrugated plates located at an angle of 30-45 ° to the base of the body and installed symmetrically relative to each other along the entire height of the sprinkler. The corrugations are made in the form of a rounded profile with circular holes located on the corrugation projections.

The disadvantage of analogs and the prototype is the use of huge volumes of chemical reagents in the circulating water supply system, designed to disinfect water due to the fact that the cooling towers create favorable conditions for the development of various bacteria and microorganisms.

The task of the utility model is the development of a reagentless evaporative cooling tower, in which the disadvantages of analogues and prototype are eliminated.

The technical result is a significant reduction in the volume of chemicals used by supplying the main part of the cooled water to a tubular radiator, in which heat transfer occurs through the radiator wall without direct contact with atmospheric air while maintaining a high cooling efficiency of circulating water.

The technical result is achieved by the fact that in a reagent-free evaporative cooling tower, consisting of a housing, a liquid supply manifold, a liquid collection tank and a fan, the housing includes a sprinkler consisting of tubular elements welded together along the end surfaces. In this case, the tubular elements are corrugated plates located at an angle to the base of the body and installed symmetrically relative to each other along the entire height of the sprinkler. In addition, the corrugations are made in the form of a rounded profile with round-shaped holes located on the corrugation projections. According to the present utility model, the liquid supply manifold has two nozzles, a radiator located inside the housing along the entire height of the sprinkler in the form of a tubular coil, the end surfaces of which are located perpendicular to the inclined corrugated sprinkler plates. In addition, a pump is installed to supply a coolant.

The essence of the utility model is illustrated by the following drawings:

in fig. 1 depicts a proposed reagentless evaporative cooling tower;

in fig. 2 is a diagram of the arrangement of the sprinkler blocks.

The numbers in the drawing indicate:

1 - case;

2 - sprinkler, consisting of inclined corrugated plates;

3 - tubular radiator;

4 - fan;

5 - tank for collecting liquid;

6 - pump;

7 - fitting for supplying the main flow of the cooled liquid;

8 - coolant supply fitting;

9 - branch pipe for the main flow of the cooled liquid;

10 - shut-off valves.

A reagentless evaporative cooling tower contains a housing 1 with a sprinkler 2 installed in it, which is an inclined corrugated plate with round drain holes located on the corrugation protrusions, a fan 4, a liquid inlet manifold having a nozzle 7 for supplying the main flow of the liquid to be cooled and a nozzle 8 for feeding the coolant pumped from the tank 5, designed to collect the liquid, by the pump 6. The main flow of the cooled liquid is removed through the nozzle 9. Inside the housing 1, along the entire height of the sprinkler block 2, a tubular radiator 3 in the form of a coil is installed, designed to cool the main flow of liquid without direct contact with atmospheric air. The shutoff valve 10 serves to regulate the flow rate of the cooled liquid coming from the inlet manifold.

The proposed non-reagent evaporative cooling tower operates as follows.

The water heated in the technological equipment, entering the liquid supply manifold, is divided into two streams in such a way that the main stream (a) of the cooled liquid enters the tubular radiator 3 through the nozzle 7, without contacting atmospheric air. The second stream of water (b), passing through the nozzle 8, is evenly distributed in the volume of the sprinkler 2 and interacts with the air stream, while being cooled by partial evaporation. This liquid flow acts as a refrigerant and is supplied to the irrigation of the tubular radiator 3, removing the heat of the cooled liquid through the pipe wall. The water flow (b) consists of 5-6% hot water coming from the process equipment and chilled water in the tank 5, which is sent back to the nozzle 8 using the pump 6. The liquid level is maintained in the tank 5 by adding fresh make-up water required to replenish part of the evaporated liquid. Thus, a closed coolant circuit is provided.

In the sprinkler block of the proposed cooling tower, an intense process of heat and mass transfer is observed due to the following phenomena. Cooling water entering through the nozzle 8 made in the wall of the housing 1 is distributed along the inclined corrugated plate of the sprinkler 2. The presence of corrugations on the heat and mass transfer surface creates significant turbulization of the moving fluid at a relatively low flow rate. The fluid flow moves in the grooves of the corrugations from top to bottom along a Z-shaped trajectory, washing the tubular radiator 3. In this case, part of the liquid falls down along the surface of the housing wall, the other part falls on the corrugated plate located below. At the same time, the falling film of water contacts the flow of rising air created by the fan 4. Holes for the passage of cooling air are made on the projections of the corrugated plates. Excess water falls into these holes and, in contact with air, is distributed in the volume of the sprinkler 2. Air passes through the holes of the plate (in Fig. 2, the flow path is indicated by a dashed line), bends around pipes 3 and sprays water drops in different directions, thereby spraying the liquid throughout the entire volume of the sprinkler, including the outer surface of the radiator pipes 3. The coolant, partially evaporating, flows into the tank for collecting the liquid 5. The main flow of the cooled liquid is removed through the nozzle 9.

In the proposed non-reagent evaporative cooling tower, several types of interaction of the gas and liquid phases can be distinguished, such as contact of air with water during the film flow of liquid along the corrugated plates and the radiator; contact with air during a jet stream of water passing through holes in the plates; contact of atmospheric air with large droplets of liquid during the crushing of jets, as well as in the case of collision of the liquid with the surface of the film on the plate. According to the studies of various authors, the spraying and collision of liquid droplets on the pipe surface makes it possible to increase the heat transfer coefficients up to 30 times from the pipe surface due to the evaporation of the spray liquid.

In the proposed non-reagent evaporative cooling tower, in comparison with analogs and the prototype, the main part of the cooled liquid does not come into contact with air, while various impurities are not absorbed from it, therefore, the development of microorganisms in the environment becomes impossible. The use of inclined corrugated plates as a sprinkler block makes it possible to create a uniform distribution of contacting phases, and, as a result, to provide high efficiency of water cooling in a reagentless evaporative cooling tower.

Thus, the use of the proposed method for cooling the circulating water by supplying the main part of the liquid to be cooled to the tubular radiator of the sprinkler unit with corrugated plates can significantly reduce the use of chemicals in the circulating water supply system.

Claims (1)

A reagent-free evaporative cooling tower, consisting of a body, a liquid supply manifold, a liquid collection tank and a fan, the body includes a sprinkler consisting of tubular elements welded together along the end surfaces, while the tubular elements are corrugated plates located at an angle to the base of the body and installed symmetrically relative to each other along the entire height of the sprinkler, in addition, the corrugations are made in the form of a rounded profile with round-shaped holes located on the corrugation protrusions, characterized in that the liquid supply manifold has two fittings, a radiator located inside the housing throughout the height of the sprinkler in the form of a tubular coil, the end surfaces of which are located perpendicular to the inclined corrugated plates of the sprinkler, in addition, a pump is installed for supplying a cooling liquid.

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