Deodorization system, deodorization device, and deodorization program

Abstract

This deodorizing system provides a solution that achieves both reduced power consumption for the deodorizing fan and high mist collection efficiency by appropriately controlling the speed of the gas passing through the mist separator, independently of the exhaust volume of the deodorizing fan. [Solution] The deodorization system comprises a deodorizing fan 16 that discharges gas from containers 13A and 13B via ducts 151 and 152, a mist separator 12 located upstream of the deodorizing fan 16 in the gas flow and removing mist contained in the gas, a wind speed sensor 17 located upstream of the mist separator 12 and detecting the state of the gas passing through the duct 151, and a control unit 10 that controls the speed of the gas passing through the mist separator 12 based on the wind speed of the gas detected by the wind speed sensor 17.

Description

Technical Field

[0001] The present invention relates to a deodorization system, a deodorization device, and a deodorization program, and particularly to a deodorization system, a deodorization device, and a deodorization program provided with a mist separator in front of a deodorization filter.

Background Art

[0002] A sewage treatment plant that treats rainwater and sewage has a deodorization tower and supplies odor gas to the deodorization tower through a duct for treatment. In the duct, a deodorization fan, a mist separator, a damper, etc. are provided midway. The mist separator is a device that removes mist-like moisture and the like (hereinafter referred to as "moisture and the like") from a gas containing moisture and oil content. It has fine elements or obstacle walls inside. The supersaturated moisture contained in the gas is removed while passing through the elements. Such deodorization equipment is described in, for example, Patent Document 1. Removing mist from the gas heading towards the deodorization tower by the mist separator is effective in eliminating the influence of mist on the environment and facilities downstream of the mist separator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, in sewage treatment plants, it is known that deodorizing fans exhaust air from aeration tanks containing wastewater at a volume greater than the aeration volume (the volume of air supplied to the aeration tank) to prevent odors from leaking out. However, the aeration volume is increased or decreased to maintain the amount of dissolved oxygen (DO) necessary to suppress odors and purify pollutants in the water. Dissolved oxygen is a factor that affects the state of microorganisms and changes depending on the degree of wastewater pollution and the volume of water flowing in. Focusing on this point, in recent years, attempts have been made to reduce the power consumption of deodorizing fans by changing the exhaust volume of the deodorizing fans in accordance with the aeration volume.

[0005] When the exhaust volume of the deodorizing fan changes, the airflow rate and velocity of the gas passing through the mist separator located upstream of the deodorizing fan also change. However, in order to achieve high collection efficiency, the velocity and amount of gas processed by the mist separator are determined by specifications, and these specifications are set according to the airflow rate and velocity of the incoming air. In such mist separators, it is necessary to keep the velocity of the gas just before it passes through the elements (hereinafter also simply referred to as "passing through") within an appropriate range. Therefore, if the exhaust volume of the deodorizing fan is changed in accordance with the aeration rate, the velocity of the gas passing through the mist separator may fall outside the appropriate range, potentially reducing the mist collection efficiency.

[0006] The present invention has been made in view of the above points, and relates to a deodorization system, deodorization device, and deodorization program that appropriately control the speed of the gas passing through the mist separator independently of the exhaust volume of the deodorization fan, thereby achieving both labor savings for the deodorization fan and high mist collection efficiency. [Means for solving the problem]

[0007] One aspect of the deodorization system of the present invention involves a pipe connected to a container holding water to be treated at a sewage treatment plant, which controls the amount of aeration airflow. They change in conjunctionA fan that discharges gas from the container with an exhaust volume, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and the gas before or after passing through the mist separator It is at least one of speed, volume, or pressure. A gas sensor that detects the state, and based on the state of the gas detected by the gas sensor, A mist inflow velocity control unit controls the velocity of the gas passing through the mist separator, and a system driven by the control of the mist inflow velocity control unit. The area through which the gas passing towards the element of the mist separator is changed. and a control unit that sets the velocity of the gas within a predetermined range, include. Furthermore, one embodiment of the deodorizing system of the present invention is: The aeration airflow is controlled via a pipe connected to a container that holds the water to be treated at a sewage treatment plant. They change in conjunction A fan that discharges gas from the container with an exhaust volume, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and the gas before or after passing through the mist separator It is at least one of speed, volume, or pressure. A gas sensor that detects the state, and based on the state of the gas detected by the gas sensor, A mist inflow velocity control unit controls the velocity of the gas passing through the mist separator, and a drive operated by the control of the mist inflow velocity control unit, through which the gas passes The range of the element of the mist separator is changed. The control unit and the gas control unit set the velocity of the gas within a predetermined range. , including 。

[0008] A deodorizing device according to one aspect of the present invention uses a pipe connected to a container holding water to be treated at a sewage treatment plant to control the aeration airflow. They change in conjunction A fan that discharges gas from the container with an exhaust volume, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and the gas before or after passing through the mist separator It is at least one of speed, volume, or pressure. A deodorizing system is provided that includes a gas sensor for detecting the state of the gas, and based on the state of the gas detected by the gas sensor, Drive the controlled unit, The area through which the gas toward the element of the mist separator passes The control unit change Let me , controlling the velocity of the gas passing through the mist separator. and set the velocity of the gas within a predetermined range. Includes a mist inflow rate control unit. Furthermore, a deodorizing device according to one embodiment of the present invention is The aeration airflow is controlled via a pipe connected to a container that holds the water to be treated at a sewage treatment plant. They change in conjunctionA fan that discharges gas from the container with an exhaust volume, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and the gas before or after passing through the mist separator It is at least one of speed, volume, or pressure. A deodorizing system is provided that includes a gas sensor for detecting the state of the gas, and based on the state of the gas detected by the gas sensor, The control unit is driven, and the control unit controls the passage of the gas. The element of the mist separator of By changing the range, the velocity of the gas passing through the mist separator can be controlled. and set the velocity of the gas within a predetermined range. Includes a mist inflow rate control unit.

[0009] A deodorizing program according to one aspect of the present invention controls the aeration air volume via a pipe connected to a container holding water to be treated at a sewage treatment plant. Changes in conjunction with Applied to a deodorizing system including a fan that discharges gas from the container at an exhaust rate, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and a gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator, the system provides a computer based on the state of the gas detected by the gas sensor. The control unit is driven to change the area through which the gas toward the element of the mist separator passes. Controlling the velocity of the gas passing through the mist separator. and set the velocity of the gas within a predetermined range. Activate the mist inflow rate control function. Furthermore, a deodorizing program according to one aspect of the present invention is The aeration airflow is controlled via a pipe connected to a container that holds the water to be treated at a sewage treatment plant. They change in conjunction A fan that discharges gas from the container with an exhaust volume, a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas, and the gas before or after passing through the mist separator It is at least one of speed, volume, or pressure. Applied to a deodorizing system including a gas sensor that detects the state of the gas, the system sends a computer to the computer based on the state of the gas detected by the gas sensor. The control unit is driven, and the control unit controls the passage of the gas. The element of the mist separator of By changing the range, the velocity of the gas passing through the mist separator can be controlled. and set the velocity of the gas within a predetermined range. Activate the mist inflow rate control function. [Effect of the Invention]

[0010] According to the above form, it is possible to provide a deodorization system, a deodorization device, and a deodorization program that appropriately control the velocity of the gas passing through the mist separator independently of the exhaust volume of the deodorization fan, and achieve both labor saving of the deodorization fan and high collection efficiency of mist. [Brief Description of the Drawings]

[0011] [Figure 1] It is a diagram for explaining the deodorization system and the deodorization device of the first embodiment. [Figure 2] (a) and (b) are diagrams for explaining the mechanism related to the mist separator shown in FIG. 1 in more detail. [Figure 3] (a) and (b) are flowcharts for explaining the process of controlling the velocity of the gas in the first embodiment. [Figure 4] (a), (b), and (c) are diagrams for explaining another example of the mechanism related to the mist separator shown in FIG. 1. [Figure 5] It is a diagram for explaining the deodorization system and the deodorization device of the second embodiment. [Figure 6] (a) and (b) are flowcharts for explaining the process of controlling the velocity of the gas in the second embodiment. [Figure 7] It is a diagram for explaining the deodorization system and the deodorization device of the third embodiment. [Figure 8] (a) and (b) are flowcharts for explaining the process of controlling the velocity of the gas in the third embodiment. [Figure 9] It is a diagram for explaining the deodorization system and the deodorization device of the fourth embodiment. [Figure 10] [[ID=4I]](a) and (b) are flowcharts for explaining the process of controlling the velocity of the gas in the fourth embodiment. ] [Modes for Carrying Out the Invention]

[0012] Hereinafter, the first to fourth embodiments of the present invention (hereinafter collectively referred to as "these embodiments") will be described with reference to the drawings. The drawings used in these embodiments are intended to explain the configuration, arrangement of each part, function, effect, and technical concept of these embodiments, and do not limit the specific configuration and design of these embodiments. In addition, the drawings of these embodiments may use the same reference numerals for similar components and omit redundant explanations.

[0013] [First Embodiment] Figure 1 is a diagram illustrating the deodorization system and deodorization device of the first embodiment. Before describing the first embodiment, the configuration that forms the basis of the deodorization system of the first embodiment will be explained below.

[0014] (System assumptions) Figure 1 shows containers 13A and 13B installed in the aeration tank of a sewage treatment plant. Both containers 13A and 13B contain wastewater, which is the water to be treated. Ducts 151 and 152, which are pipes, are connected to containers 13A and 13B, and the inside of containers 13A and 13B is in communication with the inside of ducts 151 and 152. Odor-containing gas generated in containers 13A and 13B is exhausted by a deodorizing fan 16 through ducts 151 and 152 and supplied toward a deodorizing tower (not shown). In this embodiment, the relative terms "upstream" and "downstream" are defined along this gas flow.

[0015] Figure 1 also shows the control unit 10, a sensor 18a attached to container 13A, a sensor 18b attached to container 13B, and dampers 19a and 19b installed in the middle of the duct 151. The control unit 10 receives sensor signals Ss1 and Ss2 from sensors 18a and 18b, respectively, and transmits a control signal Sc3 to the deodorizing fan 16 based on the sensor signals Ss1 and Ss2 to control the deodorizing fan 16. Sensors 18a and 18b are installed in a pipe (not shown) that connects the inside and outside of containers 13A and 13B, and are sensors that detect the airflow velocity of the gas passing through the pipe.

[0016] To realize the above control, the control unit 10 is equipped with a known computer including a CPU (Central Processing Unit), work memory for executing calculations in the CPU, storage for saving programs and data used to execute calculations, communication functions for sending and receiving signals with sensors 18a and 18b, actuators (not shown), etc., and a user interface for inputting user instructions and outputting calculation results. The computer may be configured specifically for the control unit 10, or it may be a general-purpose PC (Personal Computer) for executing the deodorization program.

[0017] When sensors 18a and 18b detect a gas flow from the inside to the outside of containers 13A and 13B, the control unit 10 sends a control signal Sc3 to the deodorizing fan 16 to increase the exhaust volume. If no gas flow is detected between the inside and outside of containers 13A and 13B, the amount of gas generated inside containers 13A and 13B and the amount of exhaust from the deodorizing fan 16 are in equilibrium. Therefore, the control unit 10 sends a control signal Sc3 to the deodorizing fan 16 to maintain the exhaust volume. If a gas flow is detected from the outside to the inside of containers 13A and 13B, there is no odor leakage inside containers 13A and 13B, but the deodorizing fan 16 is operating more than necessary to prevent odor leakage. The control unit 10 sends a control signal Sc3 to the deodorizing fan 16 to reduce the exhaust volume, thereby reducing the power consumption of the deodorizing fan 16. Furthermore, the control unit 10 may send control signals Sc1 and Sc2 to the dampers 19a and 19b based on the sensor signals Ss1 and Ss2, and adjust the opening degree of the dampers 19a and 19b.

[0018] (Mist separator) The first embodiment of the deodorization system includes a mist separator 12 located upstream of the deodorizing fan 16 in the gas flow to remove mist contained in the gas, and a wind speed sensor 17 that detects the state of the gas before or after passing through the mist separator 12. In the first embodiment, the wind speed sensor 17 is a wind speed sensor that detects the speed of the gas passing through the duct 151. The control unit 10 functions as a mist inflow velocity control unit that controls the speed of the gas passing through the mist separator 12 based on the state of the gas detected by the wind speed sensor 17, and as a deodorization device of this embodiment. In the first embodiment, the wind speed sensor 17 is located upstream of the mist separator 12 in the gas flow to detect the state of the gas before it passes through the mist separator 12.

[0019] The control of the gas velocity by the control unit 10 will be explained later using Figures 3(a), (b), 6(a), (b), 8(a), (b), and 10(a), (b). In Figure 1, the portion of the duct upstream of the mist separator 12 is designated as duct 151, and the portion of the duct downstream of the mist separator 12 is designated as duct 152. Gas Aw passing through duct 151 is drawn in by the deodorizing fan 16, passes through the mist separator 12, and proceeds to a deodorizing tower (not shown) as gas Ad from which the mist has been removed.

[0020] Figures 2(a) and 2(b) are schematic diagrams to explain in more detail the mechanism related to the mist separator 12 shown in Figure 1. In Figures 2(a) and 2(b), the x, y, and z coordinates all show the x-axis as the direction of gas flow and the y-axis as the direction perpendicular to the gas flow. The z-axis indicates the height direction of the mist separator, and the direction the z-axis points is referred to as "up" or "above". Both Figures 2(a) and 2(b) show xy cross-sections of the mist separator 12 viewed from above. Both Figures 2(a) and 2(b) show the mechanism by which the control unit 10 changes the area of ​​the inlet into which gas flows into the element 21 of the mist separator 12.

[0021] As shown in Figures 2(a) and 2(b), the mist separator 12 consists of a casing 22 and an element 21 housed within the casing 22. The casing 22 may be made of, for example, FRP (Fiber Reinforced Plastics) or rigid PVC (Poly Vinyl Chloride). The element 21 may be made of, for example, PP (PolyproPylene), PVC, or PVDC (PolyVinyliDene Chloride). The sides of the casing 22 facing the duct 151 and the sides facing the duct 152 are open, allowing the gas Aw to move inside the element 21. As the gas Aw moves through the element 21, fine mist particles in the gas Aw are collected by the element, agglomerate on the surface of the element, and are separated from the element by gravity and gas flow and discharged. At this time, since the gas Aw passes through the element, it flows out of the mist separator 12 as gas Ad from which the mist has been removed.

[0022] The mechanism shown in Figure 2(a) includes a shutter 23 covering the element 21 on the front of the mist separator 12 (upstream of the mist separator 12 and close to the mist separator). In the first embodiment, the control unit 10 changes the area of ​​the inlet 122 through which gas flows into the element 21 of the mist separator 12. For this reason, in the first embodiment, the control unit 10 changes the opening degree of the shutter 23 covering the element 21.

[0023] In other words, when fully closed, the shutter 23 covers the entire surface of the casing 22 facing the duct 151, preventing contact between the element 21 and the gas Aw. The shutter 23 moves in the y direction in Figure 2(a) under the control of the control unit 10, and the portion extending from the casing 22 deforms so that it bends towards the rear of the casing (downstream of the mist separator). This deformation allows the first embodiment to save space for the installation of the mist separator 12 when the shutter 23 is open. Such a shutter 23 may be constructed, for example, by combining rigid PVC and flexible PVC.

[0024] The control unit 10 performs control based on the airflow velocity of the gas detected by the airflow velocity sensor 17. Specifically, the following relationship exists between the airflow volume Q of the gas just before it passes through the mist separator 12, the area A through which the gas passes, and the airflow velocity V of the gas at that time. Q = V×A Equation (1) Q: Volumetric airflow (m³) 3 / s) V: Wind speed (m / s) A: Area (m 2 )

[0025] The velocity V in equation (1) above is the wind speed immediately before passing through or inside the mist separator 12 (hereinafter also referred to as "passage velocity"), and is considered to be different from the wind speed measured (detected) by the wind speed sensor 17 attached to the duct 151 (hereinafter also referred to as "measured velocity"). However, it is difficult to measure the wind speed immediately before or inside the mist separator 12. The inventors of the present invention have focused on this point and obtain the passage velocity V from the measured velocity. That is, in the first embodiment, the measured velocity is converted into the airflow rate of the gas passing through the duct 151. Assuming that almost all of the gas passing through the duct 151 is directed towards the mist separator 12, the passage velocity V is calculated from the airflow rate and the opening area of ​​the mist separator 12. In order to improve the accuracy of calculating the passage velocity V, in the first embodiment, it is preferable to provide the wind speed sensor 17 inside the duct 151 where the cross-sectional area is equal to the maximum opening area through which the gas can pass in the mist separator 12. Such control will be described in detail later.

[0026] The control unit 10 determines, for example, whether or not the passing speed V based on the measured speed obtained from the wind speed sensor 17 is included in a predetermined appropriate wind speed range Vr1 to Vr2 (hereinafter referred to as "Vr1 - Vr2", where Vr1 < Vr2). When the passing speed V is not within the range of Vr1 - Vr2, a control signal Sc4 is sent to an actuator (not shown) that drives the shutter 23 to change the opening area. That is, when the passing speed V is less than the wind speed Vr1, the control unit 10 drives the shutter 23 so that the area A becomes smaller to increase the passing speed V. Conversely, when the passing speed V is greater than the wind speed Vr2, the control unit 10 drives the shutter 23 so that the area A becomes larger to decrease the passing speed V.

[0027] Fig. 2(a) shows an example in which the shutter 23 is provided on the front surface of the mist separator 12. However, the shutter 23 may be provided on the rear surface from which the gas flows out of the mist separator 12. Note that the appropriate wind speed range Vr1 - Vr2 is set to different ranges depending on whether the shutter 23 is provided on the front surface or the rear surface.

[0028] The mechanism shown in Fig. 2(b) shows a configuration in which a movable plate 25 is provided on the front surface of the mist separator 12. The movable plate 25 is supported by a support 251 that moves on two rails 252. As the support 251 moves along the rails 252, the position and angle of the movable plate 25 change, changing the area of the inlet 122 of the mist separator 12. According to the configuration for changing the area of the inlet 122 of the mist separator 12 shown in Figs. 2(a) and 2(b), since the shutter 23 or the movable plate 25 is provided immediately before the mist separator 12, the installation space of the mechanism including the mist separator 12 can be made relatively small.

[0029] (Deodorization program) Figure 3 is a flowchart illustrating the process of controlling the gas velocity in the first embodiment. The flowchart is applied to the deodorization system of the first embodiment and executed by the control unit 10. The flowchart in Figure 3 illustrates a deodorization program that executes a mist inflow velocity control function, which controls the velocity of gas Aw passing through the mist separator 12 based on the state of the gas detected by the wind speed sensor 17. Here, an example is described in which the mist separator 12 with the configuration shown in Figure 2(b) is applied to the deodorization system of the first embodiment.

[0030] When processing begins, the control unit 10 determines the opening degree of the actuator that drives the movable plate 25 (step S303) and calculates the opening area of ​​the mist separator 12 (step S304). In parallel with this, the control unit 10 acquires the wind speed V measured by the wind speed sensor 17 (step S301) and converts the wind speed to airflow rate (step S302). Then, the control unit 10 calculates the wind speed at the inlet 122 of the mist separator 12 from the converted airflow rate and opening area (step S305). Next, the control unit 10 determines whether the wind speed V is less than the lower limit of the appropriate range, which is wind speed Vr1 (step S306). If, as a result of the determination in step S306, the wind speed V is less than the wind speed Vr1 (step S306: YES), the control unit 10 instructs the actuator of the mist separator 12 to change the angle of the movable plate 25 to reduce the area of ​​the inlet 122 (step S309).

[0031] If the wind speed V is not less than the wind speed Vr1 (step S306: NO), the control unit 10 determines whether the wind speed V is greater than the upper limit of the range, which is the wind speed Vr2 (step S307). If the determination shows that the wind speed V is greater than the wind speed Vr2 (step S307: YES), the control unit 10 instructs the actuator of the mist separator 12 to change the angle of the movable plate 25 to increase the area of ​​the inlet 122 (step S308).

[0032] In step S307, when the wind speed V is not greater than the wind speed Vr2 (step S307: NO), the control unit 10 determines whether a predetermined time has elapsed since the wind speed measurement in step S301 (step S310). When the predetermined time has not elapsed (step S310: NO), the control unit 10 waits until the time elapses. Further, when the predetermined time elapses (step S310: YES), the control unit 10 returns to step S301 and reads the wind speed V detected again by the wind speed sensor 17 (step S301). The program of the first embodiment repeats the above steps S301 to S310.

[0033] Also, the control of the area of the inlet 122 in the first embodiment is not limited to the above. For example, the opening area is not limited to being sequentially calculated as in step S304, and can also be realized by storing in the memory a table that records an appropriate area A corresponding to the measured wind speed V. According to the inventors, it has been confirmed that the appropriate wind speed range Vr1 - Vr2 is, for example, 5.0 m / s or more and 6 m / s or less.

[0034] Also, the first embodiment is not limited to converting the measurement speed to the air volume, converting it back to the passing speed V, and comparing it with the appropriate wind speed range. The flowchart shown in FIG. 3(b) shows an example of processing for changing the passing speed to the air volume and comparing the changed air volume with the appropriate air volume range. In the flowchart shown in FIG. 3(b), the control unit 10 calculates the opening area of the mist separator 12 from the opening degree of an actuator (not shown) (steps S312, 313). The control unit 10 stores in advance an air volume range Qr1 - Qr2 (Qr1 < Qr2) corresponding to the wind speed range Vr1 - Vr2, and compares the air volume Q obtained by converting the measurement speed with the air volume range Qr1 (step S315).

[0035] If the airflow Q is less than the airflow Qr1 (step S315: YES), the control unit 10 instructs the actuator of the mist separator 12 to reduce the area of ​​the inlet 122 (step S316). If the airflow Q is not less than the airflow Qr1 (step S315: NO), the control unit 10 determines whether the airflow Q is greater than the upper limit of the range, which is the airflow Qr2 (step S317). If, as a result of the determination, the airflow Q is greater than the airflow Qr2 (step S317: YES), the control unit 10 instructs the actuator of the mist separator 12 to change the angle of the movable plate 25 to increase the area of ​​the inlet 122 (step S318).

[0036] Furthermore, the first embodiment is not limited to controlling the velocity of the gas passing through the mist separator 12 by changing the area of ​​the inlet 122 of the mist separator 12 using the mechanism shown in Figures 2(a) and 2(b). Other examples of mechanisms for controlling the gas velocity are shown in Figures 4(a) to 4(c) and described below.

[0037] Figures 4(a), 4(b), and 4(c) are schematic diagrams illustrating other examples of mechanisms related to a mist separator. Figures 4(a), 4(b), and 4(c) are all top views of each mechanism. In the mechanism shown in Figure 4(a), upstream of the mist separator 12, the duct 151 is branched into a number of branch pipes, and the control unit 10 is configured to selectively open and close valve bodies that open and close each of the branch pipes.

[0038] In other words, the configuration shown in Figure 4(a) is such that duct 151 is branched into branch pipes 151a, 151c, and 151e. Furthermore, downstream of branch pipes 151a, 151c, and 151e, duct 151 is branched into branch pipes 151b, 151d, and 151f. Branch pipe 151a is connected to branch pipe 151b, and a valve 29 is provided at the connection point. Branch pipe 151c is connected to branch pipe 151d, and a valve 29 is provided at the connection point. Branch pipe 151e is connected to branch pipe 151f, and a valve 29 is provided at the connection point. The control unit 10 controls the area over which gas flows into the mist separator 12 by selectively opening and closing the valves 29.

[0039] Furthermore, a flow straightening plate 31 is provided between the branch pipes 151b, 151d, and 151f and the mist separator 12. The flow straightening plate 31 is located upstream of the mist separator 12 in the gas flow, preventing the gases flowing in from each branch pipe 151b, 151d, and 151f from mixing, and improving the accuracy of the control that changes the area of ​​the inlet 122. With such a flow straightening plate 31, the opening area of ​​the mist separator 12 is changed further forward than the mechanism shown in Figures 2(a) and (b), so the velocity of the gas flowing into the mist separator 12 can be stabilized. Also, because the deodorization system has a long duct length and ample cross-sectional area, it is suitable for a mechanism that changes the opening area using such a flow straightening plate.

[0040] When using the mechanism shown in Figure 4(a), the control unit 10 obtains the airflow rate from the measured speed detected by the wind speed sensor 17 and converts the airflow rate into, for example, a passage speed V. It then determines whether the passage speed V is within an appropriate range. The control unit 10 reduces the number of valves 29 that are opened when the passage speed V is lower than the appropriate range, and increases the number of valves 29 that are opened when the passage speed V is higher than the appropriate range. For example, if the valves 29 between branch pipes 151a and 151b and the valves 29 between branch pipes 151c and 151d are open and the passage speed V becomes greater than the wind speed Vr2, the control unit 10 further opens the valve 29 between branch pipes 151e and 151f to control the passage speed V to decrease.

[0041] Conversely, if the wind speed V falls below the above state, the control unit 10 can increase the passing wind speed to bring it within an appropriate range by closing the valve 29 between branch pipes 151c and 151d, or the valve 29 between branch pipes 151c and 151d and between branch pipes 151e and 151f.

[0042] The mechanism shown in Figure 4(b) includes a swing valve 32 pivotally supported on a shaft 321 upstream of the mist separator 12. The swing valve 32 rotates around the shaft 321, changing the area of ​​the gas inlet 122 of the mist separator 12. The duct 151 is equipped with a flow straightening plate 31 in an area not reached by the swing valve 32 on its inner circumference, which works in cooperation with the swing valve 32 to define the gas flow path and improve the control accuracy of the inlet 122 area. When the gas passage velocity V is increased, the swing valve 32 rotates in the direction of arrow q to reduce the opening area. Conversely, when the gas passage velocity V is decreased, the swing valve 32 rotates in the direction of arrow p to increase the opening area.

[0043] The mechanism shown in Figure 4(c) includes a duct 153 located between ducts 151 and 152, and an external screw 33 attached to the duct 153. The duct 153 is positioned upstream of the mist separator 12, and the external screw 33 is pushed into the duct 153, changing the area of ​​the opening surface (YZ cross section) of the duct 153. The control unit 10 controls the movement of the external screw 33 (moving in the direction indicated by arrow B). In addition, in the configuration shown in Figure 4(c), a flow straightening plate 31 is provided upstream of the mist separator 12.

[0044] The external thread 33 moves in the -Y direction when the wind speed V is increased, narrowing the YZ cross-section. Conversely, the external thread 33 moves in the Y direction when the wind speed V is decreased, widening the YZ cross-section.

[0045] Thus, the first embodiment optimizes the velocity of the gas passing through the mist separator 12 by changing the opening area of ​​the mist separator into which the gas flows. However, changing the area of ​​the inlet of the mist separator 12 raises concerns that the gas velocity may not be as set because the flow of gas flowing in immediately before the mist separator 12 becomes turbulent. On the other hand, the configuration in Figure 4(a), in which the duct is branched to adjust the opening area, allows the gas to flow into the mist separator 12 without turbulence, enabling highly accurate control of the airflow velocity. Furthermore, the mechanisms in Figures 4(b) and (c), in which a swing valve 32 and an external screw 33 are provided at a distance from the mist separator 12, eliminate turbulence in the gas flow immediately before the mist separator 12, enabling highly accurate control of the airflow velocity. Furthermore, the mechanism shown in Figures 4(b) and (c), which includes a rectifier plate 31 between the swing valve 32 or external screw 33 and the mist separator 12, can more reliably suppress turbulence in the gas flow and control the wind speed V with high precision.

[0046] As described above, the first embodiment uses a wind speed sensor to detect the airflow rate in order to control the velocity of the gas passing through the mist separator 12. Therefore, the wind speed near the mist separator can be measured indirectly, and the wind speed can be controlled with high precision. Furthermore, the first embodiment is not limited to the configuration shown in Figure 1. For example, it is not limited to providing a sensor for every two containers and exhausting with one deodorizing fan, but rather a sensor may be provided for each of multiple containers and exhausted with one deodorizing fan, or a sensor may be provided for every many containers and exhausted with one deodorizing fan.

[0047] [Second Embodiment] Next, a second embodiment will be described. Figure 5 is a diagram illustrating the deodorization system and deodorization device of the second embodiment. The deodorization system of the second embodiment differs from the first embodiment in that it is equipped with an airflow sensor 47 instead of the wind speed sensor 17 of the first embodiment. Although Figure 5 shows an example in which the airflow sensor 47 is installed upstream of the mist separator 12, the airflow sensor 47 may also be installed downstream of the mist separator 12 to measure the airflow of the gas after it has passed through the mist separator 12.

[0048] When controlling the airflow velocity through the mist separator 12 using the airflow sensor 47, the gas passage velocity V can be obtained from the airflow, and the opening area of ​​the mist separator 12 can be adjusted until the passage velocity V falls within an appropriate range. Alternatively, in the second embodiment, the range of airflow Qr1 to Qr2 (hereinafter referred to as "Qr1-Qr2") in which the gas reaches an appropriate velocity when passing through the mist separator 12 can be determined in advance by experimentation, and the opening area of ​​the mist separator can be adjusted until the airflow sensor 47 reaches the determined range of airflow Qr1-Qr2. When adjusting the airflow, the mechanism related to the mist separator 12 can be any of the configurations shown in Figures 2(a), (b), and Figures 4(a) to 4(c).

[0049] Figures 6(a) and 6(b) are flowcharts illustrating the process of controlling the gas velocity in the second embodiment. The flowcharts in Figures 6(a) and 6(b) are explained using an example that includes the movable plate 25 shown in Figure 2(b). When the process in the flowchart of Figure 6(a) is started, the control unit 10 calculates the opening area of ​​the mist separator 12 from the opening degree of an actuator (not shown) that drives the movable plate 25 (steps S602, S603). In parallel with this, the control unit 10 detects the airflow rate Q using the airflow sensor 47 (step S601). The control unit 10 then calculates the passage velocity V at the inlet from the airflow rate and determines whether the passage velocity V is less than the lower limit of the appropriate airflow velocity, Vr1 (step S605). If, as a result of the determination in step S605, the passing velocity V is less than the wind speed Vr1 (step S605: YES), the control unit 10 changes the angle of the movable plate 25 to reduce the opening area of ​​the mist separator 12 (step S607).

[0050] If the passage velocity V is not less than the wind speed Vr1 (step S605: NO), the control unit 10 determines whether the passage velocity V of the gas is greater than the wind speed Vr2, which is the upper limit of the wind speed (step S606). If the determination shows that the passage velocity V is greater than the wind speed Vr2 (step S606: YES), the control unit 10 controls the movable plate 25 to change its angle and increase the opening area (step S608).

[0051] In step S606, if the passing speed V is not greater than the wind speed Vr2 (step S606: NO), the control unit 10 reads the airflow detected by the airflow sensor 47 at predetermined time intervals (step S601). The program of the second embodiment repeats steps S601 to S609 described above.

[0052] Furthermore, the second embodiment is not limited to calculating the gas passage velocity V from the measured airflow rate, as shown in Figure 6(a), but may also compare the measured flow rate with a flow rate corresponding to an appropriate velocity range Vr1-Vr2. Figure 6(b) is a flowchart illustrating the processing of such an example. The control unit 10 calculates the opening area of ​​the mist separator 12 from the opening degree of an actuator (not shown) that drives the movable plate 25 (steps S612, 613). Then, it calculates the appropriate airflow rates Qr1-Qr2 that yield an appropriate passage velocity V corresponding to the calculated opening area (step S614). Then, it compares the measured airflow rate Q with the airflow rate Qr1 (step S615), and if the airflow rate Q is less than the airflow rate Qr1 (step S615: YES), it reduces the opening area of ​​the mist separator 12 (step S617).

[0053] Furthermore, if the airflow Q is not less than the airflow Qr1 (step S615: NO), the control unit 10 determines whether the airflow Q is greater than the airflow Qr2 (step S616). If the airflow Q is greater than the airflow Qr2 (step S616: YES), the opening area of ​​the mist separator 12 is increased (step S618).

[0054] As explained above, the second embodiment controls the gas velocity using the airflow rate of the gas directed toward the mist separator 12, thus simplifying the process by eliminating the need to convert velocity to airflow rate compared to the first embodiment.

[0055] [Third Embodiment] Next, a third embodiment will be described. Figure 7 is a diagram illustrating the deodorization system and deodorization device of the third embodiment. The deodorization system of the third embodiment differs from the first embodiment in that it is equipped with pressure sensors 58a and 58b instead of the wind speed sensor 17 of the first embodiment, and detects the pressure difference between the upstream and downstream of the mist separator 12. When controlling the gas velocity V using the pressure difference, the detected pressure difference is converted into airflow. Then, for example, the gas passage velocity V as the gas passes through the mist separator 12 can be calculated from the airflow, and this can be achieved by controlling the area of ​​the inlet so that the passage velocity V is within an appropriate range. The third embodiment, which is equipped with pressure sensors 58a and 58b both upstream and downstream of the mist separator 12, can be said to be a configuration that detects both the state of the gas before passing through the mist separator and the state of the gas after passing through it.

[0056] Figures 8(a) and 8(b) are flowcharts illustrating the process for controlling the gas velocity in the third embodiment. When the process in the flowchart of Figure 8(a) is started, the control unit 10 calculates the opening area of ​​the mist separator 12 from an actuator (not shown) (steps S803, 804). In parallel with this, the control unit 10 obtains the airflow rate from the detected pressure difference (differential pressure) (step S802). Then, it calculates the gas passage velocity V from the obtained airflow rate (step S805) and compares the calculated passage velocity V with an appropriate velocity range Vr1-Vr2 (steps S806, S808). If the passage velocity V is less than the airflow velocity Vr1 as a result of the comparison (step S806: YES), the control unit 10 reduces the opening area of ​​the mist separator 12 (step S807). Furthermore, if the passage speed V is greater than the wind speed Vr2 (step S808: YES), the control unit 10 increases the opening area of ​​the mist separator 12 (step S809).

[0057] Furthermore, the third embodiment is not limited to converting the pressure difference into airflow and obtaining the passage velocity V. In the third embodiment, the airflow obtained from the pressure difference may be compared with airflows Qr1-Qr2 corresponding to an appropriate range of airflow velocities Vr1-Vr2. The flowchart shown in Figure 8(b) shows an example of comparing the airflow Q obtained from the pressure difference with airflows Qr1-Qr2. According to the flowchart shown in Figure 8(b), the control unit 10 compares the airflow Q with airflows Qr1-Qr2 (steps S816, S818), and if the airflow Q is less than the airflow Qr1, it reduces the opening area of ​​the mist separator 12 (step S817). Also, if the airflow Q is greater than the airflow Qr2, the control unit 10 increases the opening area of ​​the mist separator 12 (step S819).

[0058] The third embodiment described above detects the state of the gas before and after the mist separator 12, rather than in front of or upstream of it. Therefore, the third embodiment can control the gas velocity with high precision based on information corresponding to the gas velocity passing through the inside of the mist separator 12.

[0059] [Fourth Embodiment] Figure 9 is a diagram illustrating a deodorizing system and deodorizing device according to the fourth embodiment. The deodorizing system of the fourth embodiment differs from the first embodiment in that it uses a sensor signal Ss8 indicating the current consumption of the deodorizing fan 16, or a sensor signal Ss9 indicating the driving frequency of the deodorizing fan 16, instead of the wind speed sensor 17 of the first embodiment. The current consumption and driving frequency of the deodorizing fan 16 reflect the amount of gas before and after passing through the mist separator 12.

[0060] When controlling the airflow velocity of the deodorizing fan 16 based on its current consumption or drive frequency, the airflow rate of the gas passing through the mist separator 12 is obtained from the current consumption or drive frequency. The airflow rate is converted to, for example, wind speed and compared with the passage speed. Alternatively, the obtained airflow rate may be compared with the airflow rate corresponding to an appropriate speed. In this way, the passage speed of the gas through the mist separator 12 can be adjusted using the existing deodorizing fan 16 without the need to separately install sensors for wind speed or airflow rate.

[0061] Figures 10(a) and 10(b) are flowcharts illustrating the process of controlling the gas velocity in the fourth embodiment. The flowchart in Figure 10(a) illustrates an example in which the opening area is changed by the movable plate 25 shown in Figure 2(b) using the drive frequency of the deodorizing fan 16.

[0062] When the flowchart shown in Figure 10(a) is initiated, the control unit 10 determines the opening degree of the movable plate 25 from an actuator (not shown) and calculates the opening area (steps S1003, S1004). The control unit 10 also outputs a sensor signal Ss8 indicating the current consumption of the deodorizing fan 16. The control unit 10 reads the sensor signal Ss8 and detects the current consumption A (step S1001). Next, the control unit 10 converts the current consumption value into airflow and calculates the airflow velocity at the inlet, i.e., the passage velocity V, together with the opening area (step S1005). Then, the control unit 10 compares the calculated passage velocity V with the airflow velocities Vr1-Vr2 (steps S1006, S1008). The control unit 10 decreases the opening area if the passage speed V is less than the wind speed Vr1 (step S1006: YES), and increases the opening area if the passage speed V is greater than the wind speed Vr2 (step S1008: YES) (step S1009).

[0063] Furthermore, the fourth embodiment is not limited to converting the current value to airflow and calculating the passage velocity V from there, as shown in Figure 10(a). For example, as shown in the flowchart in Figure 10(b), the opening area may be calculated from the opening degree of the movable plate 25 (step S1113), and the appropriate airflow corresponding to the airflow velocities Vr1-Vr2 may be calculated from the opening area. Moreover, the fourth embodiment may convert the appropriate airflow to the current consumption and compare this current consumption with the measured current consumption of the deodorizing fan 16 (steps S1116, S1118).

[0064] Furthermore, the fourth embodiment is not limited to using the current consumption of the deodorizing fan 16 as the sensor signal, but may also use the operating frequency of the deodorizing fan 16. In this case, the processing is represented by changing "current value" to "frequency" and "A" representing current to "f" representing frequency in Figures 10(a) and (b).

[0065] The fourth embodiment described above obtains information from the existing deodorizing fan without the need for a separate sensor, thus reducing the number of parts and simplifying the configuration. Furthermore, since there is no need for space to install a separate sensor, the design flexibility for the configuration related to adjusting the speed of the gas passing through the mist separator 12 can be increased. [Explanation of Symbols]

[0066] 10 Control Unit 12 Mist Separator 13A,13B Container 16 Deodorizing fan 17 Wind speed sensor 19a, 19b Damper 21 elements 22 Casing 23 Shutter 25 Movable plate 29 valves 31 Rectifier plate 32 Swing valve 33 External thread 47. Airflow sensor 49. Airflow sensor 58a, 58b Pressure Sensors 122 Inlet Ducts 151, 152, 153 151a,151b,151c,151d,151e,151f Branch pipe

Claims

1. A fan that discharges gas from a container at a sewage treatment plant via a pipe connected to the container containing the treated water, with an exhaust volume that changes in conjunction with the aeration airflow, A mist separator is provided upstream of the fan in the gas flow to remove mist contained in the gas, A gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator, A mist inflow velocity control unit controls the velocity of the gas passing through the mist separator based on the state of the gas detected by the gas sensor, A deodorizing system comprising: a control unit which is driven by the control of the mist inflow velocity control unit to change the area through which the gas toward the element of the mist separator passes, thereby setting the velocity of the gas within a predetermined range.

2. A fan that discharges gas from a container at a sewage treatment plant via a pipe connected to the container containing the treated water, with an exhaust volume that changes in conjunction with the aeration airflow, A mist separator is provided upstream of the fan in the gas flow to remove mist contained in the gas, A gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator, A mist inflow velocity control unit controls the velocity of the gas passing through the mist separator based on the state of the gas detected by the gas sensor, A deodorizing system comprising: a control unit which is driven by the control of the mist inflow velocity control unit to change the range of the elements of the mist separator through which the gas passes, thereby setting the velocity of the gas within a predetermined range.

3. The deodorizing system according to claim 1 or 2, wherein the gas sensor includes at least one of the following: a wind speed sensor for detecting the velocity of gas passing through the tube; a wind volume sensor for detecting the amount of gas passing through the tube; a pressure sensor for detecting the pressure difference of the gas passing through the tube before and after the mist separator; a current sensor for detecting the current consumption of the fan; and a frequency sensor for detecting the driving frequency of the fan.

4. The deodorizing system according to claim 1 or 2, wherein the control unit changes the area of ​​the inlet through which the gas flows into the element of the mist separator.

5. The deodorizing system according to claim 4, further comprising a shutter covering the element, wherein the control unit changes the opening degree of the shutter.

6. The deodorizing system according to claim 1 or 2, wherein upstream of the mist separator, the tubular body is branched into a plurality of branch pipes, each branch pipe is equipped with a valve body that opens and closes independently, and the control unit selectively opens and closes the valve bodies.

7. The deodorizing system according to claim 1 or 2, wherein upstream of the mist separator, a swing valve or external screw is provided to change the opening area of ​​the pipe, and the control unit controls the swing valve or external screw to drive.

8. The deodorizing system according to claim 4, further comprising a flow straightening plate located upstream of the mist separator in the flow of gas, which changes the area of ​​the gas inlet in the mist separator.

9. The deodorizing system according to claim 1 or 2, wherein the mist inflow velocity control unit determines the velocity of the gas passing through the element of the mist separator from the amount of gas flowing into the tube of the mist separator.

10. A deodorizing device comprising: a fan that discharges gas from a container at a rate of exhaust that changes in conjunction with the aeration airflow rate via a pipe connected to a container containing water to be treated at a sewage treatment plant; a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas; and a gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator, wherein the mist inflow velocity control unit is provided, and the control unit drives a control unit based on the gas state detected by the gas sensor, causing the control unit to change the area through which the gas toward the element of the mist separator passes, thereby controlling the velocity of the gas passing through the mist separator and keeping the gas velocity within a predetermined range.

11. A deodorizing device comprising a mist inflow velocity control unit provided in a deodorizing system including: a fan that discharges gas from a container at an exhaust rate that changes in conjunction with the aeration airflow rate via a pipe connected to a container containing water to be treated at a sewage treatment plant; a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas; and a gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator, wherein the control unit drives a control unit based on the gas state detected by the gas sensor, and the control unit controls the velocity of the gas passing through the mist separator by changing the range of the elements of the mist separator through which the gas passes, thereby setting the velocity of the gas within a predetermined range.

12. This is applied to a deodorization system that includes a fan that discharges gas from a container containing water to be treated at a sewage treatment plant via a pipe connected to the container, with an exhaust volume that changes in conjunction with the aeration airflow rate; a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas; and a gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator. A deodorizing program that causes a computer to execute a mist inflow velocity control function, which involves driving a control unit based on the state of the gas detected by the gas sensor, causing the control unit to change the area through which the gas passing toward the element of the mist separator passes, thereby controlling the velocity of the gas passing through the mist separator and keeping the velocity of the gas within a predetermined range.

13. This is applied to a deodorization system that includes a fan that discharges gas from a container containing water to be treated at a sewage treatment plant via a pipe connected to the container, with an exhaust volume that changes in conjunction with the aeration airflow rate; a mist separator provided upstream of the fan in the gas flow to remove mist contained in the gas; and a gas sensor that detects at least one of the gas velocity, volume, and pressure before or after passing through the mist separator. A deodorizing program that causes a computer to drive a control unit based on the state of the gas detected by the gas sensor, and to control the speed of the gas passing through the mist separator by changing the range of the elements of the mist separator through which the gas passes, thereby controlling the speed of the gas to be within a predetermined range, and executing a mist inflow speed control function.

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