KR101370595B1 - Control system for saving air blower energy - Google Patents

Abstract

The present invention relates to a control system for saving the energy consumption of an air blower, comprising a treatment part for calculating the optimal operating range of an air blower based on the power consumption and air flow of the air blower and calculating the optimal operating condition of the air blower using the calculated optimal operating range of the air blower, the dissolved oxygen operating range of a bioreactor, and the minimally required amount of dissolved oxygen; and a control part for controlling the air flow of the air blower based on the optimal operating condition and controlling the air flow of the air blower according to changes in dissolved oxygen in the bioreactor, wherein the optimal operating condition is an operating condition having minimal power consumption among operating conditions satisfying both of the optimal operating range of the air blower and the dissolved oxygen operating condition and can minimize the power consumption of the air blower using the optimal operating range based on the power consumption and air flow of the air blower and the dissolved oxygen operating range of the bioreactor. [Reference numerals] (100) Air blower control device; (110) Treatment part; (120) Control part; (130) Air blowing amount detecting part; (140) Power consumption detecting part; (150) Dissolved oxygen amount detecting part; (160) Ammonia concentration detecting part; (170) Effluent water quality detecting part

Description

Control system for saving air blower energy use

The present invention relates to a blower control device, and more particularly to a blower control device for controlling the blower by using the optimum operating range of the blower according to the power consumption and the blowing amount of the blower and the operating range of dissolved oxygen in the bioreactor, a blower control method, and It relates to the recording medium.

Sewage treatment by microorganisms is a method of growing aerobic microorganisms that feed organic matter contained in wastewater and wastewater so that organic matter is gradually reduced. It is necessary to artificially increase the amount of dissolved oxygen in the environment, for example, wastewater.

The supply of dissolved oxygen consists of a blower. The blower utilizes negative pressure generated by the rotational force of the impeller connected to the fan motor. The blower is forced to piggyback the air into the wastewater to be discharged together to continuously maintain or increase the dissolved oxygen in the wastewater. To activate.

However, in order to supply an appropriate amount of dissolved oxygen necessary for the purification of wastewater and wastewater, the impeller must be rotated at a high speed to provide a sufficient airflow amount. . Therefore, there is a need to develop a method for optimizing the power usage of the fan motor so that the airflow can be provided only as required by the bioreactor for energy saving.

The first problem to be solved by the present invention is to provide a blower control device for controlling the blower using the optimum operating range of the blower according to the power consumption and the blower amount of the blower and the operating range of dissolved oxygen in the bioreactor.

The second problem to be solved by the present invention is to provide a blower control method for controlling the blower using the optimal operating range of the blower according to the power consumption and the blower amount of the blower and the operating range of dissolved oxygen in the bioreactor.

It is another object of the present invention to provide a computer-readable recording medium storing a program for causing a computer to execute the above-described method.

The present invention, in order to achieve the first object, in the blower control device, calculating the blower optimum operating range according to the power consumption and the blowing amount of the blower, the calculated blower optimum operating range, the operating range of dissolved oxygen amount of the bioreactor, And a processing unit for calculating an optimum operating condition of the blower using a minimum dissolved oxygen amount required value, and controlling the blower volume of the blower according to the optimum operating condition, and controlling the blower volume of the blower according to the change of the dissolved oxygen amount of the bioreactor. And a control unit, wherein the optimum operating condition is an operating condition in which the power consumption is minimum among operating conditions satisfying both the blower optimum operating range and the dissolved oxygen amount operating range.

According to an embodiment of the present invention, the blower optimum operating range is from a point where the value of the efficiency curve of the blower is greater than the value of the trend line of the efficiency curve to a point where the slope of the efficiency curve is equal to the slope of the trend line. The efficiency curve may be a device characterized in that the curve of the blowing amount of the blower compared to the power consumption of the blower.

According to an embodiment of the present invention, when the dissolved oxygen amount operating range is out of the blower optimum operating range, the processing unit increases the number of blowers operated so that the dissolved oxygen amount operating range is within the blower optimum operating range. It may be a device characterized in that to calculate the optimum operating conditions of the blower while reducing or reducing.

According to an embodiment of the present invention, when the dissolved oxygen amount is out of the dissolved oxygen amount operating range, the control unit adjusts the blowing amount of the blower so that the dissolved oxygen amount is within the dissolved oxygen amount operating range, or the dissolved oxygen amount is When the amount of dissolved oxygen is lower than the required amount of oxygen, the amount of blowing air of the blower may be increased so that the amount of dissolved oxygen becomes higher than the required amount of dissolved oxygen.

According to an embodiment of the present invention, when the ammonia concentration of the bioreactor is outside the nitrification operation range, the minimum dissolved oxygen required value is reset according to the ammonia concentration, or the water quality of the discharged water discharged after the sewage treatment is set in advance to a predetermined water quality reference value. In the following case, it may be a device characterized in that for resetting the minimum dissolved oxygen amount required.

In order to achieve the second object of the present invention, in the blower control method, calculating a blower optimum operating range according to the power consumption and the blower amount of the blower, the calculated blower optimum operating range, the dissolved oxygen amount operating range of the bioreactor Calculating an optimal operating condition of the blower by using the required dissolved oxygen amount and the minimum dissolved oxygen amount; and controlling the blower volume of the blower according to the optimum operating condition, and adjusting the blower volume of the blower according to the change of the dissolved oxygen amount of the bioreactor. And controlling, wherein the optimum operating condition is an operating condition in which the power consumption is minimized among operating conditions satisfying both the blower optimum operating range and the dissolved oxygen amount operating range. .

In order to solve the above other technical problem, the present invention provides a computer-readable recording medium that records a program for executing the above blower control method on a computer.

According to the present invention, the power consumption of the blower can be minimized by using the blower optimum operating range and the dissolved oxygen amount operating range of the bioreactor according to the power consumption and the blowing amount of the blower. In addition, according to the present invention, it is possible to control the blower according to the change of the dissolved oxygen amount of the bioreactor, it is possible to maintain the dissolved oxygen amount while minimizing the power consumption of the blower.

1 is a block diagram of a blower control apparatus according to an embodiment of the present invention.
2 shows a blower control apparatus according to another embodiment of the present invention.
Figure 3 shows the blower optimum operating range of the blower control device according to an embodiment of the present invention.
Figure 4 shows the optimum operating conditions according to the blower optimum operating range and the dissolved oxygen amount operating range of the blower control apparatus according to an embodiment of the present invention.
5 is a blower multi-stage control of the blower control apparatus according to an embodiment of the present invention.
6 is a flowchart of a blower control method according to an embodiment of the present invention.
7 is a flowchart illustrating a blower control method according to another embodiment of the present invention.

Prior to the description of the concrete contents of the present invention, for the sake of understanding, the outline of the solution of the problem to be solved by the present invention or the core of the technical idea is first given.

The blower control device according to an embodiment of the present invention, calculates the blower optimum operating range according to the power consumption and the blowing amount of the blower, the calculated blower optimum operating range, the dissolved oxygen amount operating range of the bioreactor, and the minimum dissolved oxygen amount required value A processor configured to calculate an optimum operating condition of the blower by using the controller, and a controller configured to control the blower volume of the blower according to the optimum operating condition, and to control the blower volume of the blower according to the change of the dissolved oxygen amount of the bioreactor. The optimum operating condition is an operating condition in which the power consumption is minimized among operating conditions satisfying both of the blower optimum operating range and the dissolved oxygen amount operating range.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art, however, that these examples are provided to further illustrate the present invention, and the scope of the present invention is not limited thereto.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: It is to be noted that components are denoted by the same reference numerals even though they are shown in different drawings, and components of different drawings can be cited when necessary in describing the drawings. In the following detailed description of the principles of operation of the preferred embodiments of the present invention, it is to be understood that the present invention is not limited to the details of the known functions and configurations, and other matters may be unnecessarily obscured, A detailed description thereof will be omitted.

1 is a block diagram of a blower control apparatus according to an embodiment of the present invention.

Blower control apparatus 100 according to an embodiment of the present invention is composed of a processing unit 110 and the control unit 120.

The processor 110 calculates a blower optimum operating range according to the power consumption and the blowing amount of the blower, and uses the calculated blower optimum operating range, the dissolved oxygen amount operating range of the bioreactor, and the minimum dissolved oxygen amount required to operate the blower optimally. Calculate the condition.

More specifically, the processor 110 calculates an optimum operating condition of the blower that can minimize the power consumption of the blower. In order to calculate the optimum operating conditions of the blower that can minimize the power consumption of the blower, in the present invention, the optimum operating range of the blower according to the power consumption and blowing amount of the blower, and the operating range of the dissolved oxygen amount of the bioreactor, and the minimum dissolved oxygen amount required value Use Power consumption detected by the power consumption detector 130 for detecting the power consumption of the blower, blown air amount detected by the blow amount detector 140 for detecting the blow amount of the blower, and dissolved oxygen amount detector for detecting the dissolved oxygen amount of the bioreactor The amount of dissolved oxygen detected at 150 is used. The power consumption detection unit may detect the power consumption of the blower in the switchboard (MCC) for supplying power to the blower, the blower amount detection unit may be installed in the pipe through which the air passes by the blower to detect the blown air volume. In addition, the dissolved oxygen amount can be detected by the dissolved oxygen meter (DO meter) installed in the bioreactor.

The processor 110 calculates an optimal operating range of the blower by using the power consumption and the blowing amount of the blower. Here, the optimum blower operating range is the range of the most efficient efficiency of the blow amount compared to the power consumed by the blower, the optimum blower operating range can be calculated using the efficiency curve of the blower. If the blower is out of the optimum operating range, it is necessary to increase or decrease the number of blowers to operate. That is, the blower optimum operating range is a range in which the efficiency of the blower air is good compared to the power consumption while using a predetermined blower amount or more, and the blower optimum operating range is calculated using the efficiency curve and the trend line of the blower. The efficiency curve of the blower may be a curve of the blowing amount of the blower compared to the power consumption of the blower. The efficiency of the blower decreases as the amount of power consumed increases. Therefore, the slope of the efficiency curve changes in the direction of the blowing amount as the power consumption increases. The trend line of the efficiency curve is calculated in order to calculate the blower optimum operating range. The trend line may be calculated by various conventional methods. The emerged trend line is drawn across the efficiency curve. The blower optimum operating range may be set in a range from a point at which the value of the efficiency curve of the blower becomes larger than a value of the trend line of the efficiency curve to a point at which the slope of the efficiency curve is equal to the slope of the trend line. The trend line can be seen as the average efficiency over the power consumption of the blower, the point where the value of the efficiency curve is larger than the value of the trend line, that is, the amount of air blown according to the efficiency curve for a particular power consumption trend line for the corresponding power consumption The point which is larger than the blowing amount according to the above is calculated as the lowest point of the blower optimum operating range. The efficiency of the blower is high above the point, so that the blower is controlled to use the power consumption above the point. Further, the point at which the slope of the efficiency curve is equal to the slope of the trend line is calculated as the maximum point of the blower optimum operating range. The inclination of the efficiency curve decreases from the lowest point of the optimum operating range of the blower, and the point of inclination of the efficiency curve decreases so that the inclination of the trend line is the same as the maximum point of the optimum operating range of the blower. The inclination of the trend line is the average power consumption of the blower, and controls the blower so as to use the blower in a range that is greater than the average power consumption of the blower. As described above, the optimum operating range of the blower is calculated. The method of calculating the optimum operating range of the blower will be described in detail with reference to FIG. 3.

The processing unit 110 further calculates the optimum operating conditions of the blower by using the calculated optimum operating range, the dissolved oxygen amount operating range of the bioreactor, and the minimum dissolved oxygen amount required value. During the sewage treatment, dissolved oxygen in the bioreactor must be maintained within a certain range. Here, the dissolved oxygen amount operating range of the bioreactor is a range in which the dissolved oxygen amount of the bioreactor is to be maintained. The dissolved oxygen amount operating range may vary according to a sewage treatment method, a sewage treatment capacity, and the like, and the dissolved oxygen amount operating range may be set in advance. The dissolved oxygen operation range is a specific range, it can be set to 1.5 mg / l to 2.5 mg / l depending on the sewage treatment plant. The minimum dissolved oxygen amount is a minimum value of dissolved oxygen required for sewage treatment in the bioreactor, and the minimum dissolved oxygen amount may be set in advance. The minimum dissolved oxygen required value is a specific value and may be set within a range of 0.5 mg / l to 2.5 mg / l depending on the sewage treatment plant.

The optimum operating condition of the blower is an operating condition in which the power consumption is minimized among operating conditions satisfying both of the blower optimum operating range and the dissolved oxygen amount operating range. In addition, the optimum operating conditions of the blower should be a condition capable of maintaining a dissolved oxygen amount higher than the minimum dissolved oxygen amount required value. Since the dissolved oxygen amount operating range is higher than the minimum dissolved oxygen amount required value, the optimum operating conditions of the blower may be calculated using the blower optimum operating range and the dissolved oxygen amount operating range. The optimum operating condition of the blower satisfies both the calculated blower optimum operating range and the dissolved oxygen amount operating range, that is, a range in which the two ranges overlap, and among the overlapping ranges, a point where the power consumption is minimum is the power consumption. Since the point becomes the minimum, the point may be calculated as an optimum operating condition of the blower. In the optimum operating condition of the blower, while maintaining the minimum value of the dissolved oxygen operating range to be maintained during the sewage treatment, it is an operating condition consuming the minimum power consumption, it is possible to reduce the energy consumed in the blower.

If the dissolved oxygen amount operating range deviates from the calculated blower optimum operating range and there is no overlapping range, the blower until the dissolved oxygen amount operating range is within the blower optimum operating range to calculate the optimum operating condition of the blower The optimum operating conditions of the blower can be calculated while increasing or decreasing the number of steps. Instead of using only one blower, the number of blowers can be adjusted according to the situation. When the dissolved oxygen amount operating range is higher than the blower optimum operating range, it is necessary to increase the number of blowers to operate because only the number of blowers to be operated currently does not allow the sewage treatment to an optimal condition. On the contrary, when the dissolved oxygen amount operating range is lower than the blower optimum operating range, the number of blowers currently to be operated is unnecessary for the sewage treatment under the current conditions, so it is necessary to reduce the number of blowers to be operated. When the number of blowers to be operated is changed, the blower optimum operating range is recalculated according to the changed number of blowers, and the recalculated blower optimum operating range, the dissolved oxygen amount operating range, and the minimum oxygen amount required value are used. Recalculate the optimum operating conditions.

The processor 110 determines whether the dissolved oxygen amount is lower than the minimum dissolved oxygen amount required value or is out of the dissolved oxygen amount operation range while operating the blower according to the calculated optimal operating condition. In addition, when the blowing amount of the blower is adjusted according to the dissolved oxygen amount, it is determined whether the adjusted blow amount is within the optimum operating range of the blower, and when the number of blowers is increased or decreased as the outside of the optimum operating range, the changed number Recalculate the optimum operating range according to the blower of.

The control unit 120 controls the blowing amount of the blower according to the optimum operating conditions, and controls the blowing amount of the blower according to the change of the dissolved oxygen amount of the bioreactor. More specifically, the blowing amount of the blower is controlled according to the optimum operating condition calculated by the processor 110. That is, the blowing amount of the blower is controlled so that the blower can be operated under the optimum operating condition. The controller 120 may control the amount of blower of the blower by controlling the amount of power applied to the blower. When the processing unit 110 calculates the optimum operating condition, when the dissolved oxygen amount operating range is out of the blower optimum operating range, the control unit 120 operates the blower to operate the dissolved oxygen amount operating range within the blower optimum operating range. Increase or decrease the number of steps in steps. When the processing unit 110 calculates the optimum operating condition and the optimum operating condition is not calculated, the control unit 120 increases or decreases the number of blowers by one, and the processing unit 110 calculates the optimum operating condition again. . By repeating the calculation of the processing unit 110 and the adjustment of the blower of the control unit 120, the optimum operating condition can be calculated, and the control unit 120 controls the blowing amount of the blower according to the finally calculated optimal operating condition. do. That is, at the initial stage of operating the blower, the blower is controlled according to the optimum operating conditions satisfying both of the above ranges by using the blower optimum operating range and the dissolved oxygen amount operating range.

When the dissolved oxygen amount of the bioreactor is changed during the operation of the blower, the controller 120 adjusts the blowing amount of the blower according to the change of the dissolved oxygen amount. The dissolved oxygen amount is more than the minimum dissolved oxygen amount required and must be kept within the operating range of the dissolved oxygen amount. However, dissolved oxygen can vary depending on the quality of the sewage and other environmental requirements. When the dissolved oxygen amount is different, the control unit 120 adjusts the blowing amount of the blower so that the dissolved oxygen amount is greater than or equal to the minimum dissolved oxygen amount required value and maintained within the operating range of the dissolved oxygen amount. When the dissolved oxygen amount is out of the range to be maintained, the blowing amount of the blower is adjusted.

When the dissolved oxygen amount is lower than the minimum dissolved oxygen amount required, the controller 120 may increase the blowing amount of the blower so that the dissolved oxygen amount becomes higher than the minimum dissolved oxygen amount required. When the amount of dissolved oxygen is lower than the minimum required amount of oxygen, the amount of air supplied to the bioreactor needs to be increased. The control unit 120 controls the blowing amount of the blower so that the amount of dissolved oxygen becomes higher than the minimum required amount of dissolved oxygen. Increase. The blowing amount may be gradually increased in accordance with the amount of dissolved oxygen detected, and the blowing amount may be increased at a constant rate, such as 5% or 10%. When the control unit 120 increases the blowing amount, it is determined whether the blowing amount is within the blower optimum operating range, and when the blowing amount is outside the blower optimum operating range, the blowing amount of the increased blower is within the blower optimum operating range. If possible, the number of blowers driven can be increased step by step. In order to increase the amount of dissolved oxygen, when the blowing amount is increased, the blowing amount may be outside the optimum operating range of the blower, and the number of the blowers may be increased so that the amount of blowing required to increase the dissolved oxygen amount is within the optimum operating range of the blower. . By increasing the number of blowers, the blower optimum operating range is also increased, and the amount of blowers necessary to increase the amount of dissolved oxygen may be located within the blower optimum operating range.

When the dissolved oxygen amount is out of the dissolved oxygen amount operating range, the controller 120 adjusts the blowing amount of the blower so that the dissolved oxygen amount is within the dissolved oxygen amount operating range. When the dissolved oxygen amount is out of the dissolved oxygen amount operating range during sewage treatment, that is, when the dissolved oxygen amount is lower than the dissolved oxygen amount operating range, or when the dissolved oxygen amount is higher than the dissolved oxygen amount operating range, the dissolved oxygen amount is the dissolved oxygen amount operating range. The control unit 120 increases or decreases the blow amount of the blower so as to remain in. The blowing amount may be gradually increased in accordance with the amount of dissolved oxygen detected, and the blowing amount may be increased or decreased at a constant rate, such as 5% or 10%. In this case, too, when the amount of blown air adjusted so that the amount of dissolved oxygen is within the operating range of the dissolved oxygen amount is outside the optimum operating range of the blower, the number of blowers to be driven may be increased or decreased in stages. The controlled blowing amount may increase, but may decrease. If the adjusted blow amount is higher than the blower optimum operating range, the number of blowers is increased. On the other hand, when the adjusted blow amount is lower than the blower optimum operating range, the blower amount can be supplied to a smaller number of blowers than the present one, thereby reducing the number of blowers. If the current number of blowers is one, the amount of dissolved oxygen may be lowered so that the operation of the blowers may be stopped until the supply of the blowing amount is necessary.

If the ammonia concentration in the bioreactor is outside the nitrification operating range, the minimum dissolved oxygen requirement may be reset according to the ammonia concentration. The blower is controlled by the control unit 120, the dissolved oxygen amount calculated by the processing unit 110 is greater than or equal to the minimum dissolved oxygen amount required value, is within the dissolved oxygen amount operating range, and the operation of the blower satisfies the optimum operating conditions. Even in this case, when the ammonia concentration of the bioreactor sensed by the ammonia concentration detector 160 is out of the nitrification operation range, sewage treatment is not performed properly. In order to maintain the ammonia concentration within the nitrification operation range, the minimum Reset dissolved oxygen requirements. By increasing the minimum required amount of dissolved oxygen, the required amount of dissolved oxygen is increased, and the optimum operating conditions vary according to the increased amount of dissolved oxygen. In order to maintain the changed optimum operating conditions, the control unit 120 adjusts the blowing amount of the blower to increase the air supplied to the bioreactor, so that the ammonia concentration of the bioreactor can be maintained within the nitrification operation range. The nitrification operating range may be an operating range for maintaining ammonia in the bioreactor.

In addition, when the water quality of the discharged water discharged after the sewage treatment is less than the predetermined water quality reference value, the minimum dissolved oxygen required value may be reset according to the quality of the discharged water. The blower is controlled by the control unit 120, the dissolved oxygen amount calculated by the processing unit 110 is greater than or equal to the minimum dissolved oxygen amount required value, is within the dissolved oxygen amount operating range, and the operation of the blower satisfies the optimum operating conditions. Even in this case, if the water quality of the discharged water discharged after the sewage treatment sensed by the discharge water quality detection unit 170 is less than the water quality reference value, the sewage treatment is not performed properly, in order to increase the water quality of the discharge water above the water quality standard value. Reset dissolved oxygen requirements. By increasing the minimum required amount of dissolved oxygen, the required amount of dissolved oxygen is increased, and the optimum operating conditions vary according to the increased amount of dissolved oxygen. In order to maintain the changed optimal operating conditions, the control unit 120 adjusts the blowing amount of the blower, so that the air supplied to the bioreactor is increased, and the water quality of the effluent can be increased above the water quality standard value.

2 shows a blower control apparatus according to another embodiment of the present invention.

The blowing amount of the blower 220 may be controlled by a control signal generated by the blower control panel 210. The blower control panel 210 controls the air flow rate data detected by the air flow meter 211, the power consumption data measured by the switchboard (MCC) 212, and the bioreactor sensed by the dissolved oxygen detector (DO meter) 213 of the bioreactor. By using the dissolved oxygen amount DO, a blower optimum operating range and an optimum operating condition may be calculated to control the blower amount of the blower 220. In addition, the minimum dissolved oxygen required value may be reset by using the ammonia concentration detected by the ammonia concentration meter 215 or the effluent water quality detected by the TMS (Tele Monitoring System) 217. Each data, the dissolved oxygen amount and the air flow amount can be provided to the operator through the field operation computer for the operator to monitor. Based on the data, the operator may adjust the dissolved oxygen range or the minimum dissolved oxygen requirement according to the situation.

Figure 3 shows the blower optimum operating range of the blower control device according to an embodiment of the present invention.

The x-axis of the graph is the power consumption 310, and the y-axis is the blowing amount 320. The efficiency curve, which is the amount of air blown against the power consumption of the blower, is represented by a curve of 330, and the trend line with respect to the efficiency curve is calculated as a straight line of 340. It can be seen that the trend line 340 according to the efficiency curve 330 of the graph is calculated as y = 111.3x + 622.33, and the optimum operating range of the blower is calculated using the efficiency curve 330 and the trend line 340. The optimum operating range of the blower is a point at which the slope of the efficiency curve is equal to the slope 111.3 of the trend line from the point where the airflow value of the efficiency curve 330 becomes larger than the airflow value of the trend line 340 as power consumption increases (a = 111.3). The optimum operating range of the blower is a range in which the efficiency of the blow amount relative to the power consumption of the blower is the best. The processor 110 calculates the blower optimum operating range according to the above scheme.

Figure 4 shows the optimum operating conditions according to the blower optimum operating range and the dissolved oxygen amount operating range of the blower control apparatus according to an embodiment of the present invention.

The x-axis of the graph is the power consumption 310, the left side of the y-axis is the blowing amount 320, and the right side of the y-axis is the dissolved oxygen amount 410. In order to calculate the optimum operating range of the blower, the dissolved oxygen amount operating range 430 or 460 and the minimum dissolved oxygen amount required value 420 must be set in advance. Depending on the situation, the dissolved oxygen amount operating range 430 or 460 and the minimum dissolved oxygen amount required value 420 may be changed. The optimum operating condition is a condition in which the power consumption becomes the minimum among the minimum dissolved oxygen amount required value 420, the blower optimum operating range 300, and the dissolved oxygen amount operating range 430. If the dissolved oxygen amount operating range is the dissolved oxygen amount operating range of 430, the optimum operating condition is 440, which is a condition that satisfies the three conditions. When the dissolved oxygen amount operating range is out of the blower optimum operating range 300 (450 or 460), the blowing amount according to the power consumption for maintaining the dissolved oxygen amount operating range 450 or 460 is determined by the blower optimum operating range 300. It is to be noted that by increasing the number of blowers, the blower optimum operating range 300 should be higher than present. In addition, when the dissolved oxygen amount 410 is maintained in the dissolved oxygen amount operating range 430, control of the blower is unnecessary, but the dissolved oxygen amount 410 is out of the dissolved oxygen amount operating range 430 or the minimum dissolved oxygen amount required value ( 420) When the temperature is lowered to 470, which is less than or equal to 470, the amount of air supplied to the bioreactor is controlled by adjusting the air blowing amount of the blower so that the dissolved oxygen amount is positioned within the dissolved oxygen amount operating range 430 again. According to the adjustment of the blowing amount, when the blowing amount is outside the blower optimum operating range 300, the number of blowers may be adjusted. This will be described in detail with reference to FIG. 5.

5 is a blower multi-stage control of the blower control apparatus according to an embodiment of the present invention.

When the dissolved oxygen amount operating range 430 is out of the current blower optimum operating range 510, the number of blowers to be driven should be increased stepwise to adjust the blower optimum operating range to the 520 blower optimal operating range. When the dissolved oxygen amount operating range 430 is out of the blower optimum operating range 510 according to one blower, the number of blowers to be driven is increased to two, and the blower optimum operating range 520 according to the two blowers is calculated again. In addition, it is determined whether the dissolved oxygen amount operating range 430 is within the blower optimum operating range 520 according to the two blowers to calculate the optimum operating condition 530.

6 is a flowchart of a blower control method according to an embodiment of the present invention.

Step 610 is a step of calculating the optimum operating range of the blower according to the power consumption and the blowing amount of the blower.

More specifically, the optimum operating range of the blower is calculated using the power consumption and the blowing amount of the blower, that is, the efficiency of the blower. The blower optimum operating range is from a point at which the value of the efficiency curve of the blower is greater than a value of the trend line of the efficiency curve to a point at which the slope of the efficiency curve is equal to the slope of the trend line, wherein the efficiency curve is the blower Is the curve of the blowing amount of the blower compared to the power consumption. The detailed description of this step corresponds to the detailed description of the calculation of the optimum operating range of the blower of the processor 110 of FIG. 1, and is replaced with the detailed description of the processor 110 of FIG. 1.

Step 620 is a step of calculating the optimum operating conditions of the blower using the calculated blower optimum operating range, the dissolved oxygen amount operating range of the bioreactor, and the minimum dissolved oxygen amount required value.

More specifically, the optimum operating conditions of the blower are calculated using the blower optimum operating range calculated in step 610, the dissolved oxygen amount operating range of the bioreactor in which the dissolved oxygen amount is to be maintained, and the minimum dissolved oxygen amount required value. The optimum operating condition is an operating condition in which the power consumption becomes the minimum among the operating conditions satisfying both the blower optimum operating range and the dissolved oxygen amount operating range. The detailed description of this step corresponds to the detailed description of the calculation of the optimum operating condition of the blower of the processing unit 110 of FIG. 1, instead of the detailed description of the processing unit 110 of FIG. 1.

Step 630 is a step of controlling the blowing amount of the blower according to the optimum operating conditions, and controlling the blowing amount of the blower according to the change of the dissolved oxygen amount of the bioreactor.

More specifically, the blower is controlled by controlling the blowing amount of the blower according to the optimum operating condition calculated in step 620. During operation of the blower, the blowing amount of the blower is controlled so that the dissolved oxygen amount is greater than the minimum dissolved oxygen amount required value and maintained within the operating range of the dissolved oxygen amount according to the change of the dissolved oxygen amount of the bioreactor.

Adjusting the blowing amount of the blower according to the change of the dissolved oxygen amount to detect, comparing the dissolved oxygen amount and the minimum dissolved oxygen required value, the result of the comparison of the dissolved oxygen amount and the minimum dissolved oxygen amount required, the dissolved oxygen amount is Increasing the blow amount of the blower if it is lower than the minimum dissolved oxygen amount required, determining whether the blower amount of the increased blower is within the blower optimum operating range, and the blower amount of the increased blower optimizes the blower optimum operating range. In the case of deviation, the step of increasing the number of blowers to operate so that the increased amount of blower blower is within the blower optimum operating range.

In addition, the adjusting the blowing amount of the blower, if the dissolved oxygen amount and the minimum dissolved oxygen amount required, as a result of the dissolved oxygen amount is higher than the minimum dissolved oxygen amount required, the dissolved oxygen amount is within the dissolved oxygen amount operating range In a determining step, if the dissolved oxygen amount is within the dissolved oxygen amount operating range, and when the dissolved oxygen amount is out of the dissolved oxygen amount operating range, adjusting the blowing amount of the blower so that the dissolved oxygen amount is within the dissolved oxygen amount operating range. Determining whether the amount of blown air adjusted so that the dissolved oxygen amount is within the range of the dissolved oxygen amount is within the operating range of the blower, and the amount of blown air adjusted so that the amount of dissolved oxygen is within the operating range of the dissolved oxygen amount is optimal for the blower. If you are out of range, The gradual increase or decrease the number of steps in the blower can be further included.

Further, the step of adjusting the blowing amount of the blower, if the dissolved oxygen amount is within the operating range of the dissolved oxygen amount, when the dissolved oxygen amount is within the operating range of the dissolved oxygen amount, the water quality of the discharged water discharged after sewage treatment is a preset reference value Determining whether the water quality of the effluent is less than or equal to the reference value, and resetting the minimum dissolved oxygen amount required value if the quality of the effluent water is less than or equal to the reference value. Thereafter, comparing the dissolved oxygen amount of the bioreactor with the reset minimum dissolved oxygen amount required value and determining whether the quality of the effluent water is less than or equal to the reset reference value may be repeated.

The detailed description of the step 630 corresponds to the detailed description of the control unit 120 of FIG. 1, and replaces the detailed description of the control unit 120 of FIG. 1.

7 is a flowchart illustrating a blower control method according to another embodiment of the present invention.

While the blower in the sewage treatment plant is operating within the optimum operating range, it is possible to control the blower according to the change of the dissolved oxygen amount. In step 710, the amount of dissolved oxygen (A) in the bioreactor is measured, and in step 720, the amount of dissolved oxygen (A) in the bioreactor is compared with the minimum required amount of oxygen (B). As a result of the comparison of step 720, if the amount of dissolved oxygen (A) in the bioreactor is lower than the minimum required amount of oxygen (B), the blowing amount (C) is increased at step 730. After increasing the blowing amount C, in step 740, it is determined whether the blowing amount C is within the blower optimum operating range D. If the blow amount C is out of the blower optimum operating range D, the blower amount C is adjusted to be within the blower optimum operating range D in step 750. As a result of the comparison of step 720, when the dissolved oxygen amount (A) of the bioreactor is higher than the minimum required oxygen amount (B), it is determined in step 760 whether the dissolved oxygen amount (A) of the bioreactor is within the dissolved oxygen amount operating range (F). As a result of the determination in step 760, when the dissolved oxygen amount A of the bioreactor is out of the dissolved oxygen operation range F, in step 770, the blowing amount C is adjusted to increase or decrease the blowing amount C. After adjusting the blowing amount C, it is determined whether the blowing amount C is within the blower optimum operating range D in step 740. If the blow amount C is out of the blower optimum operating range D, the blower amount C is adjusted to be within the blower optimum operating range D in step 750. As a result of the determination in step 760, when the dissolved oxygen amount (A) of the bioreactor is within the dissolved oxygen operation range (F), it is determined in step 780 whether the ammonia concentration (G) of the bioreactor is located within the nitrification operation range (H). As a result of the comparison of step 780, if the ammonia concentration (G) is out of the nitrification operation range (H), in step 800, the minimum dissolved oxygen requirement (B) is reset to a higher minimum dissolved oxygen requirement (B ') and the ammonia concentration (G) is increased. Steps 710 to 800 are repeated until) is within the nitrification operation range (H). When the ammonia concentration (G) of the bioreactor is located within the nitrification operating range (H), the water quality (I) is compared with the water quality standard (J) in step 790. As a result of the comparison of step 790, if the waterproof water quality (I) is lower than the water quality standard value (J), the minimum dissolved oxygen requirement (B) is reset to the higher minimum dissolved oxygen requirement (B ') in step 800, and the waterproof water quality ( Steps 710 to 800 are repeated until I) becomes higher than the water quality reference value J.

Embodiments of the present invention may be implemented in the form of program instructions that can be executed on various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: blower controller
110: processing unit
120:
130: air flow detection unit
140: power consumption detector
150: dissolved oxygen detection unit
160: ammonia concentration detection unit
170: discharge water quality detection unit

Claims (16)

In the sewage treatment plant blower control device,
A processor for calculating an optimum operating range of the blower according to the power consumption and the blowing amount of the blower, and calculating the optimum operating conditions of the blower using the calculated blower optimum operating range, the dissolved oxygen amount operating range of the bioreactor, and the minimum dissolved oxygen amount required value. ; And
A control unit for controlling the blowing amount of the blower according to the optimum operating conditions, and controlling the blowing amount of the blower according to the change of the dissolved oxygen amount of the bioreactor;
The optimum operating condition is,
It is an operating condition which the said power consumption becomes the minimum among the operating conditions which satisfy | fill both the said blower optimum operating range and the said dissolved oxygen amount operating range,
The blower optimum operation range is,
A range from a point at which the value of the efficiency curve of the blower becomes larger than a value of the trend line of the efficiency curve to a point at which the slope of the efficiency curve is equal to the slope of the trend line,
The efficiency curve is,
Apparatus characterized in that the curve of the blowing amount of the blower compared to the power consumption of the blower. delete The method of claim 1,
Wherein,
When the dissolved oxygen amount operating range is out of the blower optimum operating range, calculating the optimum operating conditions of the blower while gradually increasing or decreasing the number of blowers to operate so that the dissolved oxygen amount operating range is within the blower optimum operating range Device characterized in that. The method of claim 1,
Wherein,
And when the dissolved oxygen amount is lower than the minimum dissolved oxygen amount required, increasing the blowing amount of the blower so that the dissolved oxygen amount becomes higher than the minimum dissolved oxygen amount required. The method of claim 1,
Wherein,
And adjusting the blow amount of the blower so that the dissolved oxygen amount is within the dissolved oxygen amount operating range when the dissolved oxygen amount is out of the dissolved oxygen amount operating range. The method of claim 5, wherein
And if the regulated blow amount is outside the blower optimum operating range, increasing or decreasing the number of blowers operated in steps. The method of claim 1,
And when the ammonia concentration of the bioreactor is outside the nitrification operating range, resetting the minimum dissolved oxygen amount requirement according to the ammonia concentration. The method of claim 1,
And when the water quality of the discharged water discharged after the sewage treatment is equal to or less than a predetermined water quality reference value, the minimum dissolved oxygen amount is reset according to the quality of the discharged water. The method of claim 1,
A blowing amount detecting unit detecting a blowing amount of the blower;
A power consumption detector for detecting power consumption of the blower;
Dissolved oxygen amount detecting unit for detecting the dissolved oxygen amount of the bioreactor;
An ammonia concentration detector for detecting ammonia concentration of the bioreactor; And
The apparatus further comprises a discharge water quality detection unit for detecting the quality of the discharge water. In the sewage treatment plant blower control method,
Calculating an optimum operating range of the blower according to the power consumption and the blowing amount of the blower;
Calculating an optimum operating condition of the blower using the calculated blower optimum operating range, a dissolved oxygen amount operating range of a bioreactor, and a minimum dissolved oxygen amount required value; And
Controlling the blowing amount of the blower according to the optimum operating conditions, and controlling the blowing amount of the blower according to the change of the dissolved oxygen amount of the bioreactor;
The optimum operating condition is,
It is an operating condition which the said power consumption becomes the minimum among the operating conditions which satisfy | fill both the said blower optimum operating range and the said dissolved oxygen amount operating range,
The blower optimum operation range is,
A range from a point at which the value of the efficiency curve of the blower becomes larger than a value of the trend line of the efficiency curve to a point at which the slope of the efficiency curve is equal to the slope of the trend line,
The efficiency curve is,
The air flow rate of the blower compared to the power consumption of the blower characterized in that the curve. delete 11. The method of claim 10,
Adjusting the blow amount of the blower,
Comparing the amount of dissolved oxygen with the minimum required amount of dissolved oxygen;
Increasing the blowing amount of the blower when the dissolved oxygen amount is lower than the minimum dissolved oxygen amount required as a result of the comparison between the dissolved oxygen amount and the minimum dissolved oxygen amount required value;
Determining whether the increased blower volume of the blower is within the optimum operating range of the blower; And
If the amount of blower of the increased blower is out of the blower optimum operating range, step of increasing the number of blowers operated so that the blower of the increased blower is within the blower optimum operating range. 13. The method of claim 12,
Adjusting the blow amount of the blower,
Comparing the dissolved oxygen amount with the minimum dissolved oxygen required value and determining whether the dissolved oxygen amount is within the dissolved oxygen amount operating range when the dissolved oxygen amount is higher than the minimum dissolved oxygen amount required value;
Adjusting the blowing amount of the blower so that the dissolved oxygen amount is within the dissolved oxygen amount operating range when the dissolved oxygen amount is within the dissolved oxygen amount operating range as a result of determining whether the dissolved oxygen amount is within the dissolved oxygen amount operating range;
Determining whether the amount of blown air adjusted so that the amount of dissolved oxygen is within the operating range of the dissolved oxygen amount is within an optimum operating range of the blower; And
And gradually increasing or decreasing the number of blowers to be operated when the amount of blown air adjusted so that the amount of dissolved oxygen is within the dissolved oxygen amount operating range is outside the optimum operating range of the blower. 14. The method of claim 13,
Adjusting the blow amount of the blower,
Determining whether the dissolved oxygen amount is within the dissolved oxygen operating range, and when the dissolved oxygen amount is within the dissolved oxygen operating range, determining whether the ammonia concentration of the bioreactor is within the nitrification operating range; And
Determining that the ammonia concentration of the bioreactor is within the nitrification operation range, and resetting the minimum dissolved oxygen requirement according to the ammonia concentration of the bioreactor if the ammonia concentration of the bioreactor is outside the nitrification operation range. and,
After resetting the minimum dissolved oxygen requirement, comparing the dissolved oxygen amount of the bioreactor with the reset minimum dissolved oxygen requirement and determining whether the ammonia concentration of the bioreactor is within the nitrification operating range. How to. 14. The method of claim 13,
Adjusting the blow amount of the blower,
Determining whether the dissolved oxygen amount is within the operating range of the dissolved oxygen amount, and when the dissolved oxygen amount is within the operating range of the dissolved oxygen amount, determining whether water quality of the discharged water discharged after sewage treatment is less than or equal to a preset reference value; And
Determining that the water quality of the effluent is less than or equal to the reference value, and resetting the minimum dissolved oxygen required value according to the quality of the effluent if the quality of the effluent is less than or equal to the reference value.
After resetting the minimum dissolved oxygen requirement, comparing the dissolved oxygen amount of the bioreactor with the reset minimum dissolved oxygen requirement and determining whether the water quality of the effluent is less than or equal to the reset reference value. Way. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 10 and 12 to a computer.

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