Ozone supplying device and method for operating the same

Abstract

The ozone supplying device includes a plurality of ozone generators (3a, 3b, 3c) that generate ozone from supplied oxygen, and adsorption devices (41a, 41b) that adsorb ozone from a mixed gas composed of oxygen and ozone supplied from the ozone generators (3a, 3b, 3c), thereby separating the oxygen contained in the mixed gas, and a number of adsorption devices (41a, 41b) that is less than the total number of the ozone generators (3a, 3b, 3c), and a number of adsorption devices (41a, 41b) that adsorbs ozone from the mixed gas composed of oxygen and ozone. The system further includes an oxygen transfer device (42) for transferring oxygen separated from the adsorption device (41a, 41b) to the ozone generators (3a, 3b, 3c), the number of which is less than the total number of the ozone generators (3a, 3b, 3c), a first shared pipe (10a) for connecting an outlet side of the oxygen transfer device (42) to an inlet side of the ozone generators, and a second shared pipe (10b) for connecting an inlet side of the adsorption device (41a, 41b) to an outlet side of the ozone generators.

Description

[Technical field]

[0001] The present disclosure relates to an ozone supplying apparatus and a method of operating an ozone supplying apparatus.

[0002] The amount of ozone injected for the purpose of ozone treatment at water purification plants is calculated by multiplying the ozone injection rate by the amount of water being treated. For example, when the reduction of precursors such as trihalomethanes (THMs) is the target of ozone treatment at a water purification plant, these substances are highly concentrated in summer, so a high ozone injection rate is required, and the amount of water being treated in summer is generally large. For this reason, the maximum ozone injection amount, which is the design value for determining the capacity and number of ozone generators, is set by taking into account the daily water volume fluctuation range and margin rate, in addition to the product of the amount of water being treated based on summer and the ozone injection rate.

[0003] On the other hand, in actual operation outside of summer, a low ozone injection amount is sufficient, so it is common to operate the system with a low load and number of ozone generators relative to the total equipment capacity of the system consisting of multiple ozone supply devices. Also, in the ozone supply system that applied the conventional oxygen recycle technology, the oxygen recycle equipment capacity and number of units were the same as those of the ozone generators.

[0004] Furthermore, a conventional ozone supplying device equipped with related devices is disclosed in Patent Document 1. That is, an ozone supplying device is known that includes an ozone generator that generates ozone, an adsorption / desorption tower that adsorbs and desorbs the ozone, an ozonized gas transfer circuit for transferring the ozonized gas generated by the ozone generator to the adsorption / desorption tower, a pressurizing mechanism for introducing a pressurized carrier gas into the adsorption / desorption tower or a depressurizing mechanism for depressurizing the adsorption / desorption tower, an ozone buffer device that contains an adsorbent that adsorbs the ozone and suppresses fluctuations in the concentration of the introduced ozone, and a desorption gas transfer circuit for transferring the ozone desorbed from the adsorption / desorption tower to the ozone buffer device and then supplying it to a supply target (see Patent Document 1, for example). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7292554 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in ozone supply equipment that applies conventional oxygen recycling technology, the capacity and number of oxygen recycling equipment must be equivalent to that of ozone generators. This means that, particularly at power stations where there are large fluctuations in the concentration of the material being treated and in the amount of treated water, the actual operational load and operating rate are low compared to the equipment capacity of the entire series, and there are economic issues such as the fact that the energy-saving effect of oxygen recovery is low compared to the cost of introducing the oxygen recycling equipment.

[0007] In addition, in the past, ozone generators and oxygen recycling equipment were often installed in a one-to-one correspondence, so even if the oxygen recycling equipment broke down, if there was another ozone generator and oxygen recycling equipment, this equipment could be used for backup operation, but in such cases, the installation of multiple oxygen recycling equipment increased the installation space for the ozone supply device, or the equipment became more complicated, resulting in high maintenance costs. On the other hand, when the oxygen recycling equipment was shared by multiple ozone generators, there was a problem that backup operation became difficult if the oxygen recycling equipment broke down.

[0008] The present disclosure discloses a technology for solving the above problems, and aims to improve energy conservation through oxygen recovery by increasing the load or operating rate of the oxygen recycling equipment even when operating with a small amount of ozone injection by configuring an apparatus that can share the equipment for separating and transporting oxygen. In addition, the purpose is to improve investment effectiveness by simplifying the ozone supply device and enabling reductions in equipment introduction costs, maintenance costs, and installation space by sharing the oxygen recycling equipment. [Means for solving the problem]

[0009] The ozone supply device of the present disclosure comprises: a plurality of ozone generators for generating ozone from oxygen; The ozone is adsorbed from a mixed gas composed of oxygen and the ozone and supplied from the ozone generator, thereby separating oxygen contained in the mixed gas. Suction A landing device, an oxygen transfer device that transfers the oxygen separated from the mixed gas by the adsorption device to the ozone generator, and the number of the oxygen transfer devices is less than the total number of the ozone generators; a first shared pipe that connects an outlet side of the oxygen transfer device from which oxygen is delivered and an inlet side of the ozone generator to which oxygen is supplied; a second shared pipe that connects an inlet side of the adsorption device to which the mixed gas is supplied and an outlet side of the ozone generator from which the mixed gas is delivered; The present invention is characterized by comprising: Effect of the Invention

[0010] According to the ozone supplying device of the present disclosure, by adopting a device configuration that allows the equipment for separating and transporting oxygen to be shared, the load or operating rate of the oxygen recycling equipment can be increased even when operating with a small amount of ozone injection, so that energy saving through oxygen recovery can be improved. In addition, by sharing the oxygen recycling equipment, it is possible to simplify the ozone supplying device, reduce the equipment introduction cost, maintenance cost, and installation space, and improve the investment effect. [Brief description of the drawings]

[0011] [Figure 1] 1 is a system diagram showing an example of an ozone supplying device according to a first embodiment. [Diagram 2] FIG. 2 is a system diagram showing in detail the main parts of the ozone supplying device according to the first embodiment. [Diagram 3] FIG. 2 is a diagram for systematically explaining an example of the ozone supplying device according to the first embodiment during ozone adsorption. [Figure 4] FIG. 2 is a diagram for systematically explaining an example of ozone desorption of the ozone supplying device according to the first embodiment. [Diagram 5] FIG. 11 is a system diagram showing an example of an ozone supplying device according to a second embodiment. [Figure 6] FIG. 11 is a flow chart showing a method of operating the ozone supplying device according to the second embodiment. [Figure 7] FIG. 11 is a system diagram showing an example of an ozone supplying device according to a third embodiment. [Figure 8] FIG. 11 is a flow chart showing a method of operating the ozone supplying device according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present disclosure relates to an ozone supplying device and an operating method of the ozone supplying device, which are provided with an oxygen recycling facility, in which ozone is selectively adsorbed from ozone-containing oxygen gas output from a plurality of ozone generators using an adsorbent, and the oxygen that is not adsorbed and separated is reused as a raw material for the ozone generator, in a public water supply / sewage system or a private wastewater treatment plant for the purpose of ozone treatment.

[0013] In particular, the present invention relates to an ozone supplying apparatus having an oxygen recycling facility for reusing unadsorbed oxygen as a raw material for the ozone generator, characterized in that the oxygen recycling facility is shared by the entire ozone supplying apparatus consisting of a plurality of ozone generators.

[0014] Embodiment 1 An example of the ozone supplying device according to the first embodiment will be described below with reference to the block diagrams of FIGS.

[0015] FIG. 1 shows an example of an ozone supplying apparatus according to the first embodiment in the form of a processing system diagram. The ozone supplying apparatus of the present disclosure outputs compressed air supplied from a plurality of compressed air supplying apparatuses 1a, 1b, and 1c (hereinafter also referred to as compressed air supplying apparatuses 1a to 1c) to a compressed air header pipe 11a (hereinafter also referred to as third shared piping 11a) shared by the plurality of compressed air supplying apparatuses, and supplies the compressed air to a plurality of oxygen supplying apparatuses 2a, 2b, and 2c via the compressed air header pipe 11a. The oxygen supplied from the plurality of oxygen supplying apparatuses 2a to 2c is supplied to a plurality of ozone generators 3a, 3b, and 3c (hereinafter also referred to as ozone generators 3a to 3c) via an oxygen header pipe 10a (hereinafter also referred to as first shared piping 10a) shared by the plurality of oxygen supplying apparatuses 2a to 2c. Next, these ozone generators 3a to 3c generate ozone based on the supplied oxygen, and the ozone is transferred as a mixed gas together with excess oxygen to the ozonized oxygen header pipe 10b shared by the ozone generators 3a to 3c. This mixed gas contains at least the generated ozone and the excess oxygen. Then, the ozone and oxygen are sent to the oxygen recycling facility 4 via the ozonized oxygen header pipe 10b. In the oxygen recycling facility 4, the ozone is adsorbed from the ozone and oxygen, and only the oxygen is returned to the oxygen header pipe 10a and recycled. Each of the ozone generators 3a to 3c has a power supply device (a device combining an inverter and a step-up transformer; not shown) that supplies power to the electrodes housed inside, and the power supply device can adjust the power injected into the electrodes by changing the voltage and frequency, thereby increasing or decreasing the concentration of generated ozone. Also, the first shared piping 10a connects the outlet side of the oxygen transfer device, which is the side from which oxygen is sent out from the oxygen transfer device, and the inlet side of the ozone generator, which is the side to which oxygen is supplied to the ozone generator, in a shared manner between multiple ozone generators.

[0016] On the other hand, compressed air supplied from a plurality of compressed air supply facilities 1a to 1c is sent to the oxygen recycle facility 4, and is used to desorb ozone adsorbed in the oxygen recycle facility 4. The desorbed ozone and compressed air are then supplied via a supply ozone header pipe 11b (hereinafter also referred to as a fourth shared pipe 11b) to a plurality of air diffusers 51a, 51b, 51c, and 51d provided in the ozone contact tank 5 in which the treated water 50 is stored. The supply ozone header pipe 11b is shared by the air diffusers 51a to 51d.

[0017] Here, the functions of the above four types of header pipes (from the left in FIG. 1, the compressed air header pipe 11a, the oxygen header pipe 10a, the ozonized oxygen header pipe 10b, and the supply ozone header pipe 11b) will be described in detail below.

[0018] First, the compressed air header pipe 11a serves as a circuit for supplying compressed air from the compressed air supply facility to the oxygen supply facility and for supplying compressed air to an adsorption tower (hereinafter also referred to as an adsorption device) of the oxygen recycling facility in order to desorb ozone adsorbed in the adsorption device. The oxygen header pipe also serves as a circuit for supplying oxygen from the oxygen supply equipment to the ozone generator and returning oxygen recovered by the oxygen recycling equipment to the inlet of the ozone generator. In addition, the ozonized oxygen header pipe serves as a circuit for supplying ozonized oxygen (ozone and oxygen) from each ozone generator to a common (shared) oxygen recycling facility. Finally, the supply ozone header pipe serves as a circuit for supplying desorbed ozonated air (ozone and compressed air) from the oxygen recycle facility to the ozone contact tank.

[0019] Each header pipe, such as the oxygen header pipe, is connected in parallel to multiple pieces of equipment with the same name, and the pressure differences between the pieces of equipment with the same name are averaged, and the time required for this averaging is negligible in the present disclosure.

[0020] The ozone contact tank is a tank in which ozone gas and treated water are brought into contact with each other to react with each other. The ozone generator is equipped with a power supply, and the inverter of this power supply makes it possible to adjust the concentration of ozone generated. Furthermore, the adsorption performance is monitored by the oxygen concentration at the outlet side of the adsorption tower. If the oxygen concentration is decreasing, for example, it is judged that there is a "possible malfunction." In addition, a gas leak detection device is installed to prevent gas leaks.

[0021] Next, the above-mentioned oxygen recycling facility 4 will be described in more detail with reference to FIG. FIG. 2 shows in detail the internal configuration of the oxygen recycling facility 4 in the processing system diagram of the ozone supplying device according to the first embodiment shown in FIG.

[0022] As shown within the dotted line frame in FIG. 2, the oxygen recycle equipment 4 is composed of a NOx removal device 40, a plurality of adsorption towers 41a and 41b having ozone adsorption and ozone desorption functions, an oxygen transfer device 42 to which oxygen is transferred from these adsorption towers 41a, 41b, a cooler 45 that removes the heat of compression of the oxygen gas whose temperature has increased by adiabatic compression, a pressure reduction mechanism 43 (specifically, for example a vacuum blower) that reduces the pressure and transfers the compressed air transferred to the adsorption towers 41a, 41b and the ozone desorbed in the adsorption towers 41a, 41b to the ozone contact tank 5 via the supply ozone header pipe 11b, and an ozone buffer device 44.

[0023] Here, ozone and oxygen transferred from the ozone generator through the ozonized oxygen header pipe 10b are separately supplied to the adsorption towers 41a and 41b, and after the ozone is adsorbed by an ozone adsorbent provided therein, the separated oxygen is transferred to the oxygen transfer device 42. The ozone buffer device 44 has a function of suppressing fluctuations in the concentration of ozone supplied to the ozone contact tank.

[0024] In FIG. 2, ozone and oxygen are completely separated by the ozone adsorbent provided in the adsorption tower 41a or 41b, and therefore the oxygen separated in the adsorption tower 41a or 41b is entirely recycled as a raw material for the ozone generator.

[0025] 2, the basic role of the cooler 45 is to prevent the thermal decomposition of ozone in the ozone generator caused by the temperature of the oxygen gas being handled rising to about 100° C., and prevents thermal decomposition by cooling the temperature of the gas with the above-mentioned increased temperature to about 40° C. Incidentally, without this cooler 45, high-temperature oxygen gas would be supplied to the ozone generator, raising the concern that the generated ozone would be thermally decomposed.

[0026] Next, gas transfer during ozone adsorption in the oxygen recycle facility 4 will be systematically explained in detail with reference to FIG. 3, and gas transfer during ozone desorption in the oxygen recycle facility 4 will be systematically explained in detail with reference to FIG. 4.

[0027] First, gas transfer during ozone adsorption in the oxygen recycle facility 4 will be described with reference to Fig. 3. In Fig. 3, the part enclosed in a dashed line frame corresponds to the above-mentioned oxygen recycle facility 4. The ozone and oxygen discharged from the ozonization-oxygen header pipe 10b are transferred from the NOx removal device 40 to an adsorption tower 41a or adsorption tower 41b for adsorbing ozone, and after the ozone is adsorbed in these adsorption devices, the separated oxygen passes through a cooler 45 from the oxygen transfer device 42, and is then supplied to each of the ozone generators 3a to 3c via the oxygen header pipe 10a and recycled.

[0028] Next, gas transfer during ozone desorption in the oxygen recycle facility 4 will be systematically described with reference to Fig. 4. In Fig. 4, the part enclosed in a dashed line frame corresponds to the oxygen recycle facility 4 described above. Compressed air supplied from a plurality of compressed air supply facilities is collected in a compressed air header pipe 11a, and then passes through an adsorption tower 41a or an adsorption tower 41b by a pressure reducing mechanism 43. Meanwhile, the ozone adsorbed in the adsorption tower 41a or an adsorption tower 41b is desorbed, and passes through the pressure reducing mechanism 43, which is a vacuum blower, and an ozone buffer device 44 together with the compressed air from the adsorption tower 41a or the adsorption tower 41b, and then passes through the supply ozone header pipe to the ozone contact tank 5.

[0029] As described above, according to the ozone supplying device of the first embodiment, by configuring the device so that the equipment for separating or transporting oxygen can be shared, the load or operating rate of the oxygen recycling equipment can be increased even when operating with a low ozone injection amount, so that energy saving by oxygen recovery can be improved. In addition, by sharing the oxygen recycling equipment, the ozone supplying device can be simplified, and the equipment introduction cost, maintenance cost, and installation space can be reduced, so that the investment effect can be improved.

[0030] In addition, in the case of a large-scale water purification plant where multiple large-capacity ozone generators with a capacity of 10 kg / h or more are installed, it is possible to reduce costs or equipment space by about 30%.

[0031] Embodiment 2 The ozone supplying device according to the second embodiment will be described below with reference to FIGS. The ozone supplying device of the second embodiment differs from the ozone supplying device of the first embodiment in that the oxygen recycling equipment 4 is provided with a control device for controlling a plurality of components arranged inside and outside the equipment, and signal lines connecting the control device to each component (signal lines for sending signals from the control device to each component, and signal lines for sending signals from each component to the control device).

[0032] Another difference is that, in addition to the piping connecting the multiple pieces of equipment that separate and transfer oxygen, a piping (hereinafter, this piping is referred to as a bypass piping) that branches off from the ozonized oxygen header pipe 10b and is directly connected to the supply ozone header pipe 11b, and a bypass valve 31 for controlling (opening and closing) the flow of gas is provided in the middle of the bypass piping 30. Another difference is that an adsorption tower inlet valve 21 for controlling (opening and closing) the flow of gas is provided in the middle of the piping that connects the ozonized oxygen header pipe 10b (hereinafter, also referred to as a second shared piping 10b) to the adsorption tower 41a and the adsorption tower 41b, and ozone concentration meters 46a, 46b, and 46c are installed correspondingly on the outlet side of each ozone generator (see FIG. 5). Here, the second shared piping 10b connects the inlet side of the adsorption device, which is the side that supplies the mixed gas to the adsorption device, and the outlet side of the ozone generator, which is the side that delivers the mixed gas from the ozone generator, in a shared manner among multiple ozone generators.

[0033] Next, the configuration of the ozone supplying apparatus according to the second embodiment will be described in more detail below with reference to FIG. 5, focusing on the control device 6, which is a difference from the ozone supplying apparatus according to the first embodiment.

[0034] The control device 6 is an element constituting the oxygen recycle facility 4, as shown in Fig. 5. The control device 6 receives signals from the oxygen transfer device 42, which is another component other than the device, via a signal line 61d, and from the pressure reducing mechanism 43 via a signal line 61e. In addition, the control device 6 receives signals from ozone concentration meters 46a to 46c installed on the outlet side of the ozone generators 3a to 3c, which are components other than the oxygen recycle facility 4 of the ozone supply device, via signal lines 61a, 61b, and 61c corresponding to each concentration meter.

[0035] On the other hand, the control device 6 transmits a signal to the adsorption tower inlet valve 21 via a signal line 60g and to the bypass valve 31 via a signal line 60h. Furthermore, signals are transmitted to the oxygen supply facilities 2a to 2c via signal lines 60d to 60f, respectively, and signals are transmitted to the ozone generators 3a to 3c via signal lines 60a to 60c, respectively.

[0036] If an abnormality occurs in the oxygen separation and transport equipment, the ozone generator is operated at a lower airflow rate than the rated airflow rate (here, the rated airflow rate is defined as the rated ozone generation rate / rated ozone concentration of one ozone generator). This rate can be adjusted using an inverter, etc. The oxygen transfer device and the pressure reduction mechanism are used to determine whether an abnormality has occurred. These mechanisms are each equipped with an inverter, and the abnormality is determined based on the speed, current, torque, power consumption, etc. of the motor that drives them.

[0037] The rated airflow rate of the ozone generator is adjusted by controlling the number of oxygen supply equipment or by operating the oxygen supply equipment using an inverter to adjust the amount of oxygen supplied to the ozone generator.

[0038] Next, how to adjust the oxygen flow rate supplied to the ozone generator by the oxygen supply equipment when an abnormality occurs will be specifically explained below with reference to FIG. 6 based on the adjustment method and the adjustment amount.

[0039] FIG. 6 is a flow chart illustrating the operation (operation method) of the ozone supplying device when the control device receives a failure signal via a signal line from the oxygen transfer device 42, which is equipment for separating and transferring oxygen, or the pressure reduction mechanism 43.

[0040] First, when the control device 6 receives a failure signal from the oxygen transfer device 42 via the signal line 61d or from the pressure reduction mechanism 43 via the signal line 61e (step S1), the control device 6 sends a close signal to the adsorption tower inlet valve 21 and also sends an open signal to the bypass valve 31 (step S2; see FIG. 5).

[0041] Next, an output increase signal is transmitted from the control device 6 to the ozone generator via the signal lines 60a, 60b, and 60c (step S3. See FIG. 5). At this time, the amount to be increased is given as a command value, and that value is given by the rated ozone concentration × z. Here, z is the output increase ratio with respect to the rated concentration of the ozone generator, and the value of z is usually determined in the range of 1 < z ≦ 1.5 and is determined to be an appropriate value according to the abnormal situation of the corresponding device. Note that the upper limit value of z is determined from the ozone concentration that the ozone generator can output.

[0042] Finally, an output reduction signal is oscillated from the control device 6 to the oxygen supply facilities 2a, 2b, and 2c via the signal lines 60d, 60e, and 60f, respectively (step S4. See FIG. 5). At this time, the amount to be increased is given as a command value, and that value is given by the rated ozone concentration ÷ z. Here, z is the same as that described above (detailed description is omitted here).

[0043] As described above, according to the ozone supply device of Embodiment 2, even when the shared facility for separating or transferring oxygen fails, by adopting a device configuration that allows the facility to be operated in a bypass mode, it is possible to prevent the ozone supply to the ozone contact tank from stopping, and to improve the reliability of the ozone supply device or to stabilize the treated water quality.

[0044] Also, during normal operation, since oxygen can be reused, it is not necessary to supply an oxygen flow rate corresponding to the rated air volume of the ozone generator from the oxygen supply facility. Also, when the facility for separating or transferring oxygen fails, oxygen cannot be reused, so it is necessary to supply an oxygen flow rate corresponding to the rated air volume of the ozone generator from the oxygen supply facility. Conventionally, as a backup during a failure, the oxygen supply facility was provided with a facility capacity corresponding to the rated air volume of the ozone generator. In contrast, according to the ozone supply device of Embodiment 2 of the present invention, it can be operated at an air volume lower than the rated air volume of the ozone generator during a failure, and it is expected to reduce the introduction cost of the oxygen supply facility or to save energy during a failure operation.

[0045] Furthermore, in the event of an abnormality in the oxygen separation or transport equipment, the capacity of the oxygen supply equipment can be reduced by operating at a generated ozone concentration higher than the rated ozone concentration. For example, as mentioned above, since the maximum value of z is 1.5 (which indicates that in the event of a malfunction, the generated ozone concentration can be increased to 1.5 times the rated generated ozone concentration), it can be seen that in the event of a malfunction, the volume of oxygen supplied from the oxygen supply equipment to the ozone generator can be reduced to approximately 0.67 times the rated volume. In other words, a reduction in the capacity of the oxygen supply equipment can be expected by more than 30%. However, care must be taken because the power consumption of the ozone generator increases as the generated ozone concentration increases.

[0046] Embodiment 3 The ozone supplying device according to the third embodiment will be described below with reference to Fig. 7 and Fig. 8. The ozone supplying device according to the third embodiment is different from the ozone supplying device according to the second embodiment in that it further includes an oxygen concentration meter 47 (hereinafter, also simply referred to as concentration meter 47) (see Fig. 7). This oxygen concentration meter 47 is provided to measure the oxygen concentration at the outlet position of the adsorption device, and if there is an abnormality in the oxygen concentration, an abnormality signal is transmitted to the control device 6 via a signal line 61f.

[0047] Next, the operation (operation method) of the ozone supplying apparatus according to the third embodiment in the case where a failure or abnormality occurs in the ozone supplying apparatus will be described with reference to the flow chart shown in FIG.

[0048] First, when the control device 6 receives a fault signal from the oxygen transfer device 42 via signal line 61d or from the pressure reducing mechanism 43 via signal line 61e, or receives an abnormal signal of the oxygen concentration at the adsorption tower outlet from the oxygen concentration meter 47 via signal line 61f (step S5), the control device 6 sends a close signal to the adsorption tower inlet valve 21 and also sends an open signal to the bypass valve 31 (step S2; see FIG. 6). The operations subsequent to the above (steps S3 and S4) and z in the figure are the same as those described in the operation of the ozone supplying device according to the second embodiment, and therefore will not be described here. In the ozone contact tank, only ozone is used for the reaction, so no problem occurs even if the ozone contains oxygen.

[0049] As described above, according to the ozone supplying apparatus of the third embodiment, not only a failure signal of a shared facility for separating or transporting oxygen but also an abnormality of an adsorption device, which is a facility for separating oxygen, can be detected from an oxygen concentration.

[0050] Although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in the present specification, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment. Specifically, in the above description, the signals exchanged with the control device have different functions for transmission and reception, and different reference numerals are used according to the respective functions, but this is not limited to the above, and if the components of the ozone supplying device that is the transmission destination and the reception destination of the control device are the same, the same signal line can physically perform both transmission and reception functions, so the same reference numerals may be used. Also, the description was given on the assumption that the signal line is wired, but this is not limited to the above, and the signal line may be wireless. [Explanation of symbols]

[0051] 1a, 1b, 1c compressed air supply equipment, 2a, 2b, 2c oxygen supply equipment, 3a, 3b, 3c ozone generator, 4 oxygen recycling equipment, 5 ozone contact tank, 10a first shared pipe (oxygen header pipe), 10b second shared pipe (ozonized oxygen header pipe), 11a third shared pipe (compressed air header pipe), 11b fourth shared pipe (supply ozone header pipe), 21 adsorption tower inlet valve, 30 bypass pipe, 31 bypass valve, 40 NOx removal device, 41a, 41b adsorption tower (adsorption device), 42 oxygen transfer device (blower), 43 pressure reduction mechanism (vacuum blower), 44 ozone buffer device, 45 cooler, 46a, 46b, 46c ozone concentration meter, 47 oxygen concentration meter, 50 treated water, 51a to 51d air diffuser, 60a to 60h signal line (transmission signal line from control device), 61a to 61e signal line (reception signal line of control device)

Claims

1. Multiple ozone generators that produce ozone from oxygen, An adsorption device that separates oxygen contained in a mixed gas by adsorbing ozone from a mixed gas supplied from an ozone generator, which is composed of oxygen and the ozone, The oxygen separated from the mixed gas by the adsorption device is transferred to the ozone generator, and the number of oxygen transfer devices is less than the total number of ozone generators. A first shared piping connects the outlet side of the oxygen transport device from which oxygen is discharged and the inlet side of the ozone generator from which oxygen is supplied, A second shared pipe connects the inlet side of the adsorption device to which the mixed gas is supplied and the outlet side of the ozone generator from which the mixed gas is discharged, An ozone supply device characterized by being equipped with the following features.

2. The ozone supply device according to claim 1, characterized in that the number of adsorption devices is less than or equal to the total number of ozone generators.

3. The ozone contact tank, to which the ozone and compressed air are supplied and to which the stored treated water and the ozone are brought into contact, is connected via a shared pipe separate from the first and second shared pipes, and a bypass pipe branched from the second shared pipe, An adsorption tower inlet valve is installed in the path of the piping connected to the second shared piping and located on the inlet side of the adsorption device, A bypass valve installed within the path of the bypass piping, A control device having signal lines individually connected to the adsorption device and the oxygen transfer device, and which opens and closes the adsorption tower inlet valve and the bypass valve based on signals transmitted from the adsorption device and the oxygen transfer device via each signal line, Equipped with, The ozone supply device according to claim 1 or 2, characterized in that it is the same as described in claim 1 or 2.

4. A cooler for cooling the gas passing through the piping is provided in the path of the piping installed to transfer the separated oxygen from the adsorption device to the first shared piping. The ozone supply device according to claim 1 or 2, characterized in that it is the same as described in claim 1 or 2.

5. A cooler for cooling the gas passing through the piping is provided in the path of the piping installed to transfer the separated oxygen from the adsorption device to the first shared piping. The ozone supply device according to claim 3.

6. A concentration meter for measuring the oxygen concentration is installed in the path of the piping used to transfer the separated oxygen from the adsorption device to the first shared piping. The ozone supply device according to claim 3.

7. Multiple ozone generators that produce ozone from oxygen, An adsorption device that separates oxygen contained in a mixed gas by adsorbing ozone from a mixed gas supplied from an ozone generator, which is composed of oxygen and the ozone, The oxygen separated from the mixed gas by the adsorption device is transferred to the ozone generator, and the number of oxygen transfer devices is less than the total number of ozone generators. A first shared piping connects the outlet side of the oxygen transport device from which oxygen is discharged and the inlet side of the ozone generator from which oxygen is supplied, A second shared pipe connects the inlet side of the adsorption device to which the mixed gas is supplied and the outlet side of the ozone generator from which the mixed gas is discharged, An ozone contact tank, to which the ozone and compressed air are supplied and which is brought into contact with the stored treated water to react, is connected via a shared pipe separate from the first and second shared pipes, and is a bypass pipe branched from the second shared pipe, An adsorption tower inlet valve is installed in the path of the piping connected to the second shared piping and located on the inlet side of the adsorption device, A bypass valve installed within the path of the bypass piping, A control device having signal lines individually connected to the adsorption device and the oxygen transfer device, and which opens and closes the adsorption tower inlet valve and the bypass valve based on signals transmitted from the adsorption device and the oxygen transfer device via each signal line, A method for operating an ozone supply device equipped with, When an abnormality occurs in the adsorption device or the oxygen transfer device, the output of the oxygen supply equipment that supplies oxygen to the ozone generator is reduced to a level lower than the rated airflow of the ozone generator, which is determined by the ratio of the rated ozone generation amount of the ozone generator to the rated ozone concentration of the ozone generator. The mixed gas is supplied directly from the ozone generator to the ozone contact tank via the bypass piping, without going through the adsorption device or the oxygen transfer device. A method for operating an ozone supply device, characterized by the following features.

8. The method for operating an ozone supply apparatus according to claim 7, characterized in that the number of adsorption devices is less than or equal to the total number of ozone generators.

9. The ozone generator is operated at an ozone concentration higher than its rated ozone concentration. The method for operating an ozone supply device according to claim 7 or 8, characterized by the features described above.

10. If the measurement value of a concentration meter installed to measure the oxygen concentration in the piping route used to transfer the separated oxygen from the adsorption device to the first shared piping is below a predetermined set value, it is determined that there is an abnormality in the adsorption device, and the adsorption tower inlet valve is closed and the bypass valve is opened to bypass the transfer of gas to the adsorption device or the oxygen transfer device, and the mixed gas supplied from the ozone generator is supplied directly to the ozone contact tank. The method for operating an ozone supply device according to claim 7 or 8, characterized by the features described above.

11. If the measurement value of a concentration meter installed to measure the oxygen concentration in the piping route used to transfer the separated oxygen from the adsorption device to the first shared piping is below a predetermined set value, it is determined that there is an abnormality in the adsorption device, and the adsorption tower inlet valve is closed and the bypass valve is opened to bypass the transfer of gas to the adsorption device or the oxygen transfer device, and the mixed gas supplied from the ozone generator is supplied directly to the ozone contact tank. The method for operating the ozone supply apparatus according to feature 9.

Images