Ozone supply device and method for operating ozone supply device

Abstract

To provide an ozone supply device improved in energy saving, and an operation method of the ozone supply device.SOLUTION: A plurality of ozone generators (3a, 3b, 3c) configured to generate ozone from the supplied ozone; the ozone is supplied from the ozone generators (3a, 3b, 3c); An adsorption unit (41a, 41b) configured to adsorb ozone from a gas mixture composed of air and ozone to separate air from the gas mixture, an air transfer unit (42) configured to transfer air separated from the gas mixture by the adsorption unit (41a, 41b) to an ozone generator (3a, 3b, 3c), and a first common pipe (10a) configured to commonly connect an outlet side of the air transfer unit (42) and an inlet side of the ozone generator; And a second common pipe (41a) commonly connecting an inlet side of the adsorption device (10b, 41b) and an outlet side of the ozone generator.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an ozone supply device and a method for operating an ozone supply device.

[0002] The amount of ozone injected for the purpose of ozone treatment at a water purification plant is calculated by multiplying the ozone injection rate by the amount of water being treated. For example, when the target of ozone treatment at a water purification plant is to reduce precursors of trihalomethanes (THMs), these compounds are highly concentrated in the summer, requiring a high ozone injection rate. Furthermore, the amount of water being treated is generally large in the summer. Therefore, the maximum ozone injection rate, which is the design value used to determine the capacity and number of ozone generators, is set by multiplying the amount of water being treated based on the summer season by the ozone injection rate, taking into account daily water volume fluctuations and a margin of error.

[0003] On the other hand, in actual operation outside of summer, a low ozone injection amount is sufficient, so it is common for a system of multiple ozone supply devices to be operated at a low load and with a low number of ozone generators relative to the total equipment capacity. Also, in ozone supply devices that use conventional oxygen recycling technology, the oxygen recycling equipment capacity and number of devices are equivalent to those of the ozone generators.

[0004] Furthermore, a conventional ozone supplying apparatus equipped with related equipment is disclosed in Patent Document 1. That is, an ozone supplying apparatus is known that includes an ozone generator that generates ozone, an adsorption / desorption tower that adsorbs and desorbs the ozone, an ozonated gas transfer circuit that transfers the ozonated gas generated in the ozone generator to the adsorption / desorption tower, a pressurization mechanism that introduces a pressurized carrier gas into the adsorption / desorption tower or a depressurization mechanism that depressurizes 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 that transfers the ozone desorbed from the adsorption / desorption tower to the ozone buffer device and then supplies the ozone to a supply target (see, for example, Patent Document 1). [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, with ozone supply equipment that uses conventional oxygen recycling technology, the capacity and number of oxygen recycling equipment must be the same as 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 system, 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 oxygen recycling equipment.

[0007] Furthermore, 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, backup operation was possible using another ozone generator and oxygen recycling equipment, but in such cases, the installation of multiple oxygen recycling equipment increased the installation space for the ozone supply equipment and led to higher maintenance costs due to the complexity of the equipment.On the other hand, when oxygen recycling equipment was shared by multiple ozone generators, there were problems such as the difficulty of backup operation if the oxygen recycling equipment broke down.

[0008] This disclosure discloses a technology for solving the above-mentioned problems, and aims to improve energy savings through oxygen recovery by configuring an apparatus that can share equipment for separating and transporting oxygen, thereby increasing the load or operating rate of the oxygen recycling equipment even when operating with a small amount of ozone injected. Furthermore, by sharing the oxygen recycling equipment, it is possible to simplify the ozone supply device, reduce equipment installation costs, maintenance costs, and installation space, thereby improving investment effectiveness. [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; an adsorption device that separates oxygen contained in a mixed gas that is composed of oxygen and the ozone and is supplied from the ozone generator by adsorbing the ozone; an oxygen transfer device that transfers the oxygen separated from the mixed gas by the adsorption device to the ozone generator; a first common pipe that connects the outlet side of the oxygen transfer device from which oxygen is delivered and the inlet side of the ozone generator to which oxygen is supplied; a second common 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 the following features. [Effects of the Invention]

[0010] According to the ozone supplying device of the present disclosure, by configuring the device so that the equipment for separating and transporting oxygen can be shared, the load on the oxygen recycling equipment or the operating rate can be increased even when operating with a small amount of ozone injected, thereby improving energy savings through oxygen recovery. Furthermore, by sharing the oxygen recycling equipment, the ozone supplying device can be simplified, and the equipment installation costs, maintenance costs, and installation space can be reduced, thereby improving investment effectiveness. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a system diagram showing an example of an ozone supplying device according to a first embodiment. [Figure 2] 1 is a system diagram showing in detail the main parts of an ozone supplying device according to a first embodiment. [Figure 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 the ozone supply device according to the first embodiment during ozone desorption. [Figure 5] FIG. 10 is a system diagram showing an example of an ozone supplying device according to a second embodiment. [Figure 6] FIG. 10 is a flowchart showing a method for operating the ozone supplying device according to the second embodiment. [Figure 7] FIG. 10 is a system diagram showing an example of an ozone supplying device according to a third embodiment. [Figure 8] FIG. 10 is a flowchart showing a method of operating the ozone supplying device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[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 that selectively adsorbs ozone from ozone-containing oxygen gas output from multiple ozone generators using an adsorbent, and reuses the oxygen that is not adsorbed and separated as a raw material for the ozone generator, in public water supply and sewerage systems and private wastewater treatment plants for the purpose of ozone treatment.

[0013] In particular, the present invention relates to an ozone supplying apparatus equipped with an oxygen recycling facility that reuses unadsorbed oxygen as a raw material for the ozone generator, and 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] 1 is a processing system diagram illustrating an example of an ozone supplying apparatus according to a first embodiment. 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-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 this compressed air header pipe 11a. The oxygen supplied from the plurality of oxygen supplying apparatuses 2a-2c is supplied to a plurality of ozone generators 3a, 3b, and 3c (hereinafter also referred to as ozone generators 3a-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-2c. Next, these ozone generators 3a to 3c generate ozone from the supplied oxygen, and the ozone and excess oxygen are transferred as a mixed gas to an 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. The ozone and oxygen are then 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 by changing the voltage and frequency with this power supply device, the power injected into the electrodes can be adjusted to increase or decrease the concentration of generated ozone. The first shared pipe 10a connects the outlet side of the oxygen transfer device, from which oxygen is delivered from the oxygen transfer device, to the inlet side of the ozone generator, from which oxygen is supplied to the ozone generator, in a shared manner among 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 recycling facility 4 and used to desorb ozone adsorbed in the oxygen recycling facility 4. After that, the desorbed ozone and compressed air are 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 storing the treated water 50. 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 (compressed air header pipe 11a, oxygen header pipe 10a, ozonized oxygen header pipe 10b, and supply ozone header pipe 11b, in order from the left in FIG. 1) 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 also for supplying compressed air to the adsorption tower (hereinafter also referred to as the 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 ozonated oxygen header pipe serves as a circuit for supplying ozonated 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 an oxygen header pipe, is connected in parallel to multiple pieces of equipment with the same name, but 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 where ozone gas and treated water are brought into contact with each other and reacted. The ozone generator is equipped with a power supply, and the inverter of this power supply can adjust the ozone generation concentration. Furthermore, the adsorption performance is monitored by the oxygen concentration at the outlet of the adsorption tower. If the oxygen concentration drops, for example, it is determined that there is a "possible malfunction." In addition, a detection device is installed to prevent gas leaks.

[0021] Next, the 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 treatment 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 recycling facility 4 is composed of a NOx removal device 40, a plurality of adsorption towers 41a and 41b each having an ozone adsorption function and an ozone desorption function, an oxygen transfer device 42 to which oxygen is transferred from these adsorption towers 41a and 41b, a cooler 45 that removes the heat of compression of the oxygen gas whose temperature has been increased by adiabatic compression, a pressure reduction mechanism 43 (specifically, a vacuum blower, for example) that reduces the pressure of and transfers the compressed air transferred to the adsorption towers 41a and 41b and the ozone desorbed in the adsorption towers 41a and 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 ozonized-oxygen header pipe 10b are separately supplied to adsorption towers 41a and 41b, respectively, and after the ozone is adsorbed by an ozone adsorbent provided therein, the separated oxygen is transferred to oxygen transfer device 42. The ozone buffer device 44 has the 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 inside the adsorption tower 41a or 41b, and therefore, all of the oxygen separated in the adsorption tower 41a or 41b is recycled as a raw material for the ozone generator.

[0025] 2, the basic role of cooler 45 is to prevent thermal decomposition of ozone in the ozone generator when the temperature of the oxygen gas being handled rises to approximately 100°C, and prevents thermal decomposition by cooling the temperature of the gas that has risen to about 40°C. 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 recycling equipment 4 will be systematically explained in detail using FIG. 3, and gas transfer during ozone desorption in the oxygen recycling equipment 4 will be systematically explained in detail using FIG. 4.

[0027] First, gas transfer during ozone adsorption in the oxygen recycling equipment 4 will be described with reference to Fig. 3. In Fig. 3, the part enclosed in a dashed-dotted line frame corresponds to the above-mentioned oxygen recycling equipment 4. The ozone and oxygen discharged from the ozonation-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 then passes through the oxygen header pipe 10a to be supplied to each of the ozone generators 3a to 3c and recycled.

[0028] Next, gas transfer during ozone desorption in the oxygen recycling system 4 will be systematically explained using Figure 4. In Figure 4, the area enclosed by a dashed-dotted line frame corresponds to the oxygen recycling system 4 described above. Compressed air supplied from multiple compressed air supply systems is collected in a compressed air header pipe 11a and then passed through an adsorption tower 41a or an adsorption tower 41b by a pressure reduction mechanism 43. Meanwhile, the ozone adsorbed in the adsorption tower 41a or an adsorption tower 41b is desorbed and, together with the compressed air, passes through the pressure reduction mechanism 43, which is a vacuum blower, and an ozone buffer device 44 from the adsorption tower 41a or the adsorption tower 41b, before being transferred to the ozone contact tank 5 via the supply ozone header pipe.

[0029] As described above, according to the ozone supplying apparatus of the first embodiment, by configuring the apparatus 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, thereby improving energy savings through oxygen recovery. Furthermore, by sharing the oxygen recycling equipment, the ozone supplying apparatus can be simplified, and the equipment introduction cost, maintenance cost, and installation space can be reduced, thereby improving investment effectiveness.

[0030] In addition, in the case of large-scale water purification plants where multiple 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 this 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 multiple pieces of equipment that separate and transport oxygen, there is a piping branching off from the ozonized-oxygen header pipe 10b and directly connecting to the supply ozone header pipe 11b (hereinafter, this piping will be referred to as the bypass piping), and a bypass valve 31 for controlling (opening and closing) the flow of gas is provided in the middle of this bypass piping 30. Another difference is that there is an adsorption tower inlet valve 21 for controlling (opening and closing) the flow of gas in the middle of the piping connecting the ozonized-oxygen header pipe 10b (hereinafter, also referred to as the second shared piping 10b) to the adsorption tower 41a and the adsorption tower 41b, and ozone concentration meters 46a, 46b, and 46c are installed at the outlet side of each ozone generator (see FIG. 5). Here, the second shared pipe 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, and is shared among multiple ozone generators.

[0033] Next, the configuration of the ozone supplying device 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 device according to the first embodiment.

[0034] As shown in Fig. 5, the control device 6 is a component of the oxygen recycling facility 4. The control device 6 receives signals from the oxygen transfer device 42, which is another component other than the device itself, via signal line 61d, and from the pressure reducing mechanism 43 via signal line 61e. The control device 6 also receives signals from ozone concentration meters 46a to 46c, which are installed on the outlet sides of the ozone generators 3a to 3c, which are other components of the ozone supply device than the oxygen recycling facility 4, 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 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 will operate at a lower airflow rate than its 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 pressure reduction mechanism each have an inverter, and abnormalities are detected based on the speed, current, torque, and power consumption of the driving motor.

[0037] The rated airflow rate of the ozone generator can be adjusted by controlling the number of oxygen supply units or by operating the oxygen supply unit using an inverter to adjust the oxygen airflow rate 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 adjustment amount.

[0039] FIG. 6 is a flowchart illustrating the operation (operating method) of the ozone supplying device when the control device receives a fault 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 fault signal from the oxygen transfer device 42 via the signal line 61d or from the pressure reducing mechanism 43 via the signal line 61e (step S1), the control device 6 transmits a close signal to the adsorption tower inlet valve 21 and 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 within 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 the second embodiment, even when the shared facility for separating or transferring oxygen fails, by adopting a device configuration that can perform bypass operation of the facility, it is possible to prevent the ozone supply to the ozone contact tank from stopping, and improve the reliability of the ozone supply device or 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 has provided a facility capacity corresponding to the rated air volume of the ozone generator. In contrast, according to the ozone supply device of the second embodiment, it can be operated at an air volume lower than the rated air volume of the ozone generator during a failure, and it is possible to expect a reduction in the introduction cost of the oxygen supply facility or energy saving during a failure operation.

[0045] Furthermore, in the event of a malfunction 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 the generated ozone concentration can be increased to 1.5 times the rated generated ozone concentration in the event of a malfunction), it can be seen that in the event of a malfunction, the oxygen flow rate supplied from the oxygen supply equipment to the ozone generator can be reduced to approximately 0.67 times the rated flow rate. In other words, a reduction of more than 30% in the capacity of the oxygen supply equipment can be expected. However, care must be taken because the power consumption of the ozone generator increases as the generated ozone concentration increases.

[0046] Embodiment 3 An ozone supplying apparatus according to a third embodiment will be described below with reference to Figures 7 and 8. The ozone supplying apparatus according to the third embodiment differs from the ozone supplying apparatus 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 Figure 7). This oxygen concentration meter 47 is provided to measure the oxygen concentration at the outlet position of the adsorption apparatus, 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 when a failure or abnormality occurs in the ozone supplying apparatus will be described with reference to the flowchart shown in FIG.

[0048] First, when the control device 6 receives a fault signal from the oxygen transfer device 42 via the signal line 61d or from the pressure reducing mechanism 43 via the signal line 61e, or receives an abnormal signal indicating the oxygen concentration at the adsorption tower outlet via the signal line 61f from the oxygen concentration meter 47 (step S5), the control device 6 transmits a close signal to the adsorption tower inlet valve 21 and 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 explained in the explanation of the operation of the ozone supplying apparatus according to the second embodiment, and therefore will not be explained here. In the ozone contact tank, only ozone is used for the reaction, so there is no problem even if the ozone contains oxygen.

[0049] As described above, according to the ozone supplying apparatus of the third embodiment, it is possible to detect not only a fault signal of the shared equipment for separating or transporting oxygen, but also an abnormality of the adsorption apparatus, which is the equipment for separating oxygen, from the 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 variations not illustrated are conceivable within the scope of the technology disclosed in the present specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment. Specifically, in the above explanation, the signals exchanged with the control device have different functions for transmission and reception, and different reference numerals are used to indicate the respective functions. However, this is not limited to this. 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 physical signal line can perform both the transmission and reception functions, and so the same reference numeral may be used. Also, while the explanation was given assuming that the signal line is wired, this is not limited to this 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 common piping (oxygen header pipe), 10b Second common piping (ozonated oxygen header pipe), 11a Third common piping (compressed air header pipe), 11b Fourth common piping (supply ozone header pipe), 21 Adsorption tower inlet valve, 30 Bypass piping, 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 Aeration device, 60a to 60h Signal line (transmission signal line from control device), 61a to 61e Signal line (reception signal line of control device)

Claims

1. a plurality of ozone generators for generating ozone from oxygen; an adsorption device that separates oxygen contained in a mixed gas that is composed of oxygen and the ozone and is supplied from the ozone generator by adsorbing the ozone; an oxygen transfer device that transfers the oxygen separated from the mixed gas by the adsorption device to the ozone generator; a first common 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 common 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; An ozone supply device comprising:

2. a bypass pipe connected to an ozone contact tank, to which the ozone and compressed air are supplied and which brings the stored treated water into contact with the ozone, via a common pipe separate from the first common pipe and the second common pipe, and branching off from the second common pipe; an adsorption tower inlet valve installed in a path of a pipe connected to the second common pipe and arranged on the inlet side of the adsorption device; a bypass valve installed in the bypass piping; a control device having signal lines individually connected to the adsorption device and the oxygen transfer device, and opening and closing the adsorption tower inlet valve and the bypass valve based on signals transmitted from the adsorption device and the oxygen transfer device via the respective signal lines; Equipped with 2. The ozone supply device according to claim 1.

3. a cooler for cooling gas passing through a pipe installed in a path of the pipe for transferring the separated oxygen from the adsorption device to the first common pipe; 2. The ozone supply device according to claim 1.

4. a cooler for cooling gas passing through a pipe installed in a path of the pipe for transferring the separated oxygen from the adsorption device to the first common pipe; 3. The ozone supply device according to claim 2.

5. a concentration meter for measuring an oxygen concentration is provided in a piping path installed for transporting the separated oxygen from the adsorption device to the first common piping; 3. The ozone supply device according to claim 2.

6. a plurality of ozone generators for generating ozone from oxygen; an adsorption device that separates oxygen contained in a mixed gas that is composed of oxygen and the ozone and is supplied from the ozone generator by adsorbing the ozone; an oxygen transfer device that transfers the oxygen separated from the mixed gas by the adsorption device to the ozone generator; a first common 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 common 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; a bypass pipe branching off from the second common pipe and connected via a common pipe separate from the first common pipe and the second common pipe to an ozone contact tank to which the ozone and compressed air are supplied and which brings the stored treated water into contact with the ozone for reaction; an adsorption tower inlet valve installed in a path of a pipe connected to the second common pipe and arranged on the inlet side of the adsorption device; a bypass valve installed in the bypass piping; a control device having signal lines individually connected to the adsorption device and the oxygen transfer device, and opening and closing the adsorption tower inlet valve and the bypass valve based on signals transmitted from the adsorption device and the oxygen transfer device via the respective signal lines; A method for operating an ozone supplying apparatus comprising: 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 operated at a lower output than the rated airflow rate 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 directly supplied from the ozone generator to the ozone contact tank via the bypass piping, without passing through the adsorption device or the oxygen transfer device; 1. A method for operating an ozone supplying apparatus comprising:

7. operating the ozone generator at an ozone concentration higher than the rated ozone concentration; 7. The method for operating an ozone supplying apparatus according to claim 6.

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