JPS6356163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent ozone supply device.

A large amount of cooling water is used in power plants, chemical industries, etc., but microorganisms and algae in the water cause slime problems, clogging pipes and reducing heat exchange efficiency. Application of highly concentrated ozonated water is being considered as a preventive measure for this type of problem. In order to generate this highly concentrated ozone water, rather than using a large-capacity ozone generator, it is necessary to use a small and small-capacity ozone generator and use the generated ozone as an adsorbent for a long period of time. The so-called intermittent ozone supply method, in which the accumulated ozone is removed from the adsorbent at once to produce highly concentrated ozone water, is advantageous in terms of equipment costs and operating costs.

An example of a typical conventional intermittent ozone supply device will be explained with reference to FIG. In the figure, 1 is an ozone generator, 2 is an oxygen supply source, 3 is a circulating blower, 4 is an adsorption/desorption tower, 5 is a cooling source, 6 is a heating source, 7 is a water ejector, and 8-1 to 8-7 are switching It is a valve group. The adsorption/desorption tower 4 has a double cylinder structure, of which the inner cylinder is filled with an ozone adsorbent, and the outer cylinder is filled with a heat medium. Furthermore, silica gel is generally used as the adsorbent, and ethylene glycol or alcohol is used as the heat medium. Note that the circulation blower 3, the ozone generator 1, and the adsorption/desorption tower 4 constitute one circulation system in this order.

Next, the operation will be explained. This operation includes two operations: an ozone adsorption operation and an ozone desorption operation.

First, the suction operation will be explained. Oxygen is constantly supplied to the circulation system from an oxygen supply source 2 at a constant pressure. The pressure at this time is normally maintained at 1.5 Kg/cm ² . The switching valves 8-3 and 8-4 are open. When oxygen is distributed in the circulation system by the circulation blower 3,
While passing through the discharge gap of the ozone generator 1, a portion of oxygen is converted into ozone by silent discharge and becomes ozonized oxygen. This ozonized oxygen is transferred to the adsorption/desorption tower 4.
transported to. The adsorbent in the ozone adsorption/desorption tower 4 is
Ozone is selectively adsorbed and the remaining oxygen is removed by the switching valve 8.
-3 to the circulating blower 3. Oxygen consumed as ozone is replenished from the oxygen supply source 2. At this time, the temperature of the ozone adsorbent is cooled to −30° C. or lower by the cooling source 5. This is because the amount of ozone adsorbed by the adsorbent varies greatly depending on the temperature. That is, when the temperature is lowered, the amount of ozone adsorbed increases, and conversely, when the temperature is increased, the amount of ozone adsorbed is decreased. Therefore, when desorbing ozone, the temperature of the adsorbent is increased.

When the adsorbent in the ozone adsorption/desorption tower 4 adsorbs ozone to a level close to the saturated adsorption amount, a transition is made to the desorption operation. During desorption operation, ozone generator 1, circulation blower 3, and cooling source 6 are used.
stops operating, and the switching valves 8-1, 8-2, 8-
3, 8-4 closes. After that, the heating source 6 and water ejector 7 start operating, and the switching valves 8-5, 8-6,
8-7 opens. At this time, heat is applied from the heating source 6 to raise the temperature of the adsorbent so that the ozone adsorbed on the adsorbent is easily desorbed. Then, the ozone in the ozone adsorption/desorption tower 4 is sucked under reduced pressure by the water jet ejector 4, and the ozone is dispersed and dissolved in water in the water jet ejector 7, and is sent to the point of use as ozone water. At this time, the ultimate pressure within the adsorption/desorption tower 4 due to vacuum suction is approximately -70 cmHg. When the desorption period ends in this manner, the initial adsorption operation is resumed and the operation is continuously repeated.

However, a drawback of the conventional apparatus described above is that ozone cannot be desorbed evenly over time. In pulp bleaching and chemical plants, the higher the ozone concentration, the faster the reaction rate and the more effectively the oxidation reaction takes place. Also, in sterilization and biological treatment, the effects of injecting higher concentrations of ozone can be greatly increased.

Figure 2 shows the temporal change in the ozone concentration in water desorbed from the adsorption/desorption tower. As can be seen here, a high concentration of ozone is desorbed at the beginning of desorption, and gradually decreases over time. That is, since the desorption concentration of ozone is not average, ozone water has high and low concentrations, and in the case of usage conditions that require a certain concentration or more for a certain period of time, ozone cannot be used efficiently because the treatment time is short.

The present invention has been made in order to eliminate the drawbacks of the conventional methods described above, and by arranging a flow rate regulating valve in the pipeline that desorbs and supplies ozone, desorption can be performed evenly over the desorption time. The purpose is to provide an intermittent ozone supply device.

An embodiment of the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 1 are given the same reference numerals and their explanations will be omitted. In the figure, reference numeral 9 denotes a flow rate adjustment valve disposed in the pipeline between the adsorption/desorption tower 4 and the water ejector 7. Next, the operation of this device will be explained. When the adsorbent in the adsorption/desorption tower 4 adsorbs ozone to near the saturated adsorption amount, it switches to desorption operation, and the switching valves 8-1, 8-2, 8-3, 8 -4 is closed, the switching valves 8-5 and 8-6 are opened, and the heat source 6 starts operating. Then, the switching valve 8-7 opens and the water ejector 7 starts operating, sucking the ozone in the adsorption/desorption tower 4 under reduced pressure, dissolving it in water, and sending it to the point of use as highly concentrated ozone water. The amount of ozone desorbed from this ozone water is adjusted by a flow rate adjustment valve 9 so that the ozone concentration always remains at a constant value.

Figure 4 shows the flow rate adjustment valve as electric valve 1.
0, and this valve 10 is composed of a detector 12 that detects the ozone concentration of ozonated water and a control device 11 that controls opening and closing of the valve, and feedback control is performed so that the ozone concentration is always kept at a constant value. It's working. According to this method, as shown in FIG. 5, the ozone concentration can be stabilized at an approximately average level. According to this, for example, in the treatment of microorganisms and algae in water, when a high concentration above a certain level is required, the utilization efficiency of ozone increases and becomes economical. Further, even when the load fluctuates, the amount of ozone desorption, that is, the ozone concentration in water, can be freely set by controlling the electrically operated valve for flow rate adjustment in a feedback manner.

As described above, according to the present invention, since the flow rate adjustment valve is arranged in the pipeline for desorbing and supplying ozone,
It is possible to maintain an average concentration of ozonated water at all times. In addition, since the ozone concentration can be freely set according to the load, ozone can be used effectively and applications can be expanded to other fields.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional ozone supply device, Figure 2
1 is a characteristic diagram showing the temporal change in the amount of ozone desorbed, FIG. 3 is a block diagram of the ozone supply device according to the present invention, FIG. 4 is a block diagram showing another embodiment, and FIG.
The figure is a characteristic diagram showing temporal changes in the amount of ozone desorbed in FIG. 4. 1...Ozone generator, 2...Oxygen supply source, 3...
...Circulating blower, 4...Adsorption/desorption tower, 7...Water ejector, 8-1 to 8-9...Switching valve, 9...Flow rate adjustment valve, 10...Electric valve, 11...Control device, 12...Detector. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. An ozone generator that generates ozonized oxygen from raw material oxygen, and an adsorption/desorption tower that can adsorb and store ozone from the ozonized oxygen and desorb this ozone;
a system for returning oxygen after ozone has been adsorbed by the adsorption/desorption tower to the ozone generator; a means for cooling the adsorption/desorption tower during ozone adsorption; and a system for raising the temperature of the adsorption/desorption tower during ozone desorption from that during adsorption. and a means for desorbing and supplying ozone by suctioning the ozone under reduced pressure, characterized in that a flow rate adjustment valve for controlling the amount of ozone desorption is disposed in the desorption and supply conduit. Intermittent ozone supply device. 2. The valve according to claim 1, characterized in that the flow rate adjustment valve is an automatic flow rate adjustment valve that controls the amount of ozone desorbed by an ozone detector that detects the amount of ozone desorbed in water. Intermittent ozone supply device.