JPS5919893Y2 - Wet and dry mixed cooling tower - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating medium cooling device that improves the performance of a dry cooling tower in a non-polluting manner.

A dry cooling tower has a heat exchanger installed in a ventilation section to allow a fluid to be cooled to flow, so that heat can be exchanged between the fluid to be cooled and the air flow.

However, this dry cooling tower may not be able to cope with severe outside air conditions or load conditions, such as high temperatures and high loads in the summer, and the power cost increases when using mechanical ventilation. If the tower is bulky and has natural ventilation, it is inevitable that the tower structure will be larger.

On the other hand, in the case of wet-type closed evaporative cooling towers, the amount of circulating cooling water must be ensured at all times, which increases equipment and running costs, and depending on the operating conditions, white smoke may be generated, causing pollution. There is a problem that.

The present invention provides an energy-saving and pollution-free cooling tower that does not have such problems, and uses mechanical ventilation or natural ventilation installed in the ventilation section of a finned or bare tube heat exchanger through which the fluid to be cooled passes. In a ventilated dry cooling tower, a water sprinkler is attached to the surface of the heat exchanger, and a white smoke detector is installed in the exhaust passage after heat exchange (regardless of whether it is outside or inside the tower). The present invention is characterized in that the amount of water sprinkled by the sprinkler device is controlled based on the signal from the white smoke detector.

To explain specifically according to the embodiments in the drawings, first to third
The figure shows a mechanically ventilated dry cooling tower improved with the present invention.
Figures 4 to 6 show a natural draft dry cooling tower improved by the present invention. Figures 1 and 4 show a heat exchanger inside the tower, and Figures 2.3 and 5.6 show a This example shows an exchanger installed in the air intake section of the outer layer of the tower.

In the case of mechanical ventilation shown in Figures 1 to 3, the necessary air volume is forcibly taken in by the blower 1, and in the case of natural ventilation shown in Figures 4 to 6,
By increasing the tower length, the required air volume is obtained by the chimney effect, but in either case, a dry heat exchanger 2 is installed in this ventilation section to exchange heat between this ventilation and the fluid to be cooled. It is a cooling tower.

The heat exchanger 2 is a finned or bare-tube heat exchanger, and when a fluid to be cooled, for example a process fluid 3 from a chemical factory or the like, is circulated in the tubes, heat is radiated to the ventilation air.

In the present invention, a water sprinkling device 4 that can spray water over the entire outer surface of the heat exchanger 2 of such a conventional dry cooling tower is attached, and a white smoke detector is attached to the exhaust passage. 5 to control the start/stop of watering and the amount of watering.

The cooling water that has fallen into the lower water tank 7 is circulated and supplied to the water sprinkler 4 by a circulation pump 6, and an electric valve 8 is installed in this water supply pipe.
is an intermediary.

In order to control the start/stop of the circulation pump 6 and the opening degree of the electric valve 8 based on the amount of white smoke in the exhaust gas, a known white smoke detector 5 that converts changes in the amount of transmitted light into electrical signals is used to detect the exhaust gas after heat exchange. It is installed in a passageway (inside or outside the tower), and the signal from this white smoke detector 5 activates a relay to automatically control the start/stop of the pump 6 and the opening degree of the electric valve 8. .

With this control, water is sprinkled on the heat exchanger 2 within the permissible range of weak white smoke, and in addition to ventilation cooling, the latent heat of evaporation of the cooling water that evaporates on the surface of the heat exchanger 2 is collected from the object to be cooled. Facilitates cooling of cooling fluid.

In this way, according to the configuration of the present invention, in addition to dry operation as a dry cooling tower, it is possible to cope with the increase in load by driving the water sprinkler during high temperature and high load times in summer, and the white smoke can be effectively reduced. By controlling water sprinkling under conditions where water does not occur, the cooling capacity is improved by the latent heat of evaporation, and the operating energy for mechanical ventilation is reduced, resulting in energy savings and
To provide a cooling tower of dry and wet molding, which simultaneously achieves various objectives such as equipment saving, capacity improvement, and non-pollution.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention of a mechanical ventilation cooling tower;
2 and 3 are schematic sectional views of another embodiment of the present invention of a mechanical draft cooling tower, FIG. 4 is a schematic sectional view of an embodiment of the present invention of a natural draft cooling tower, and FIGS. 5 and 6 are 1 is a schematic cross-sectional view of another embodiment of the present invention of a natural draft cooling tower; FIG. 1...Blower, 2...Heat exchanger, 3.
...Fluid to be cooled, 4...Water sprinkler, 5.
... White smoke detector, 6 ... Circulation pump, 7
...Lower water tank, 8...Electric valve.

Claims (1)

[Scope of utility model registration request] In a dry cooling tower with mechanical ventilation or natural ventilation, in which a finned or bare-tubular heat exchanger through which the fluid to be cooled passes is installed in the ventilation section, a water sprinkler device is installed to sprinkle water on the surface of the heat exchanger. A wet/dry mixed type cooling tower in which a white smoke detector is attached to a passage of exhaust gas that has completed heat exchange, and the amount of water sprinkled by the water sprinkler is controlled by a signal from the white smoke detector.