Automatic control method and system for blower in recycled water plant

Abstract

The present invention discloses a method and system for automatically controlling a blower in a reclaimed water plant. The method comprises: obtaining a current air-water ratio; comparing the current air-water ratio with an air-water ratio threshold range corresponding to a current time period; and determining and executing a current blower control strategy based on the comparison result. The present invention compares the current air-water ratio of the biological pool with an air-water ratio threshold range corresponding to a current time period, and determines and executes a current blower control strategy based on the comparison result, thereby achieving joint control of a precision aeration system and a blower system. While ensuring stable operation of the blower, the blower system can achieve automatic control while accurately and promptly responding to the air supply needs of the precision aeration system, thereby maximizing energy conservation and consumption reduction.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to an automatic control method and system for a blower in a reclaimed water plant. Background Art

[0002] As reclaimed water plants become increasingly intelligent, precision aeration systems for biological ponds have been gradually developed and implemented. However, integrating precision aeration systems with blower systems remains a challenge within the industry. While ensuring stable blower operation, the full application of precision aeration systems faces challenges in achieving automatic control of the blower system while accurately and promptly responding to the air supply needs of the precision aeration system, thereby maximizing energy savings and consumption reductions.

[0003] Patent document (CN114249415B) provides a precise aeration device and method, which discloses a technical solution for adjusting the initial blower pressure value according to the average dissolved oxygen concentration, the average opening of the second electric control valve, the average set value of the dissolved oxygen concentration in the aeration tank and the average set value of the opening of the second electric control valve to obtain a blower pressure correction value, thereby realizing automatic control of the blower system. However, it does not take into account the gas-water ratio, which is usually used to measure treatment efficiency and energy consumption. Therefore, this patent document cannot maximize energy saving and consumption reduction.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to propose a method and system for automatic control of a blower in a reclaimed water plant, so as to realize the joint control of a precision aeration system and a blower system. On the premise of ensuring the stable operation of the blower, the blower system can realize automatic control while accurately and timely responding to the air supply demand of the precision aeration system, thereby maximizing energy saving and consumption reduction.

[0006] To achieve the above objectives, the present invention proposes a method and system for automatically controlling a blower in a reclaimed water plant.

[0007] According to a first aspect of the present invention, a method for automatically controlling a blower in a reclaimed water plant is proposed, comprising:

[0008] Get the current gas-water ratio;

[0009] Comparing the current gas-water ratio value with the gas-water ratio threshold range corresponding to the current time period;

[0010] The current blower control strategy is determined and executed based on the comparison results.

[0011] Optionally, before obtaining the current gas-water ratio, the method further includes:

[0012] Set multiple time periods based on 24 hours and set the control cycle;

[0013] Setting the gas-water ratio threshold range corresponding to each of the time periods;

[0014] When the reclaimed water plant has only one biological pool, set the threshold range of dissolved oxygen content and the threshold range of opening of the biological pool air inlet regulating valve;

[0015] When the reclaimed water plant has multiple biological pools, set the average value threshold range of dissolved oxygen content and the average value threshold range of the biological pool air inlet regulating valve opening.

[0016] Optionally, if the current gas-water ratio is within the gas-water ratio threshold range corresponding to the current time period, the current dissolved oxygen content / the current average value of the dissolved oxygen content and the current biological pool air inlet regulating valve opening / the current average value of the biological pool air inlet regulating valve opening are obtained;

[0017] Comparing the current dissolved oxygen content / the current dissolved oxygen content average with the dissolved oxygen content threshold range / the dissolved oxygen content average value threshold range, and at the same time comparing the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average with the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range;

[0018] The current blower control strategy is determined and executed based on the comparison results.

[0019] Optionally, if the current dissolved oxygen content / the current dissolved oxygen content average value is greater than the maximum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is less than the minimum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, the blower set pressure value is reduced based on the set first pressure change value.

[0020] Optionally, if the current dissolved oxygen content / the current dissolved oxygen content average value is less than the minimum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is greater than the maximum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, the blower set pressure value is increased based on the set first pressure change value.

[0021] Optionally, except for the above two comparison results, the blower set pressure value is not adjusted.

[0022] Optionally, if the current air-water ratio is greater than the maximum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is reduced based on the set second pressure change value.

[0023] Optionally, if the current air-water ratio is less than the minimum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is increased based on the set second pressure change value.

[0024] Optionally, the duration of the control cycle is shorter than the duration of the shortest time period.

[0025] According to a second aspect of the present invention, a blower automatic control system for a reclaimed water plant is provided, comprising:

[0026] Acquisition module, used to obtain the current gas-water ratio;

[0027] a comparison module, configured to compare the current gas-water ratio value with a gas-water ratio threshold range corresponding to a current time period;

[0028] The determination and execution module determines the current blower control strategy based on the comparison results and executes it.

[0029] The beneficial effects of the present invention are as follows: by comparing the current air-water ratio of the biological pond with the air-water ratio threshold range corresponding to the current time period, the present invention determines and executes the current blower control strategy based on the comparison result, thereby achieving joint control of the precision aeration system and the blower system. While ensuring the stable operation of the blower, the blower system can achieve automatic control while accurately and promptly responding to the air supply needs of the precision aeration system, thereby maximizing energy conservation and consumption reduction. The present invention has the advantages of a stable and reliable system, timely adjustment, stable effluent water quality, and maximized energy conservation and consumption reduction.

[0030] The system of the present invention has other features and advantages that will be apparent from or will be described in detail in the accompanying drawings and subsequent detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, in which like reference numerals generally represent like components.

[0032] Figure 1 A flow chart showing the steps of a method for automatically controlling a blower in a reclaimed water plant according to the present invention is shown.

[0033] Figure 2 A flow chart showing the steps of a method for automatically controlling a blower in a reclaimed water plant according to embodiment 1 of the present invention is shown.

[0034] Figure 3 A schematic diagram of an automatic control system for blowers in a reclaimed water plant according to embodiment 3 of the present invention is shown. DETAILED DESCRIPTION

[0035] The present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention may be implemented in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0036] like Figure 1 As shown, a method and system for automatically controlling a blower in a reclaimed water plant according to the present invention includes:

[0037] Get the current gas-water ratio;

[0038] Compare the current gas-water ratio value with the gas-water ratio threshold range corresponding to the current time period;

[0039] The current blower control strategy is determined and executed based on the comparison results.

[0040] Specifically, the present invention first sets a current air-water ratio of the biological pool and an air-water ratio threshold range corresponding to the current time period, and determines and executes the current blower control strategy based on the comparison result; wherein, the 24 hours of a day can be divided into multiple time periods, and each time period is set with its corresponding air-water ratio threshold range; when the comparison result is that the current air-water ratio is greater than the maximum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is reduced based on the set second pressure change value; when the comparison result is that the current air-water ratio is less than the minimum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is increased based on the set second pressure change value The large blower set pressure value, when the comparison result is that the current air-water ratio is within the air-water ratio threshold range corresponding to the current time period, then if there is only one biological pool, the current dissolved oxygen content and the current biological pool air inlet regulating valve opening are obtained, and if there are multiple biological pools, the average value of the current dissolved oxygen content of all biological pools and the average value of the current biological pool air inlet regulating valve opening are obtained, and then the current blower control strategy is determined and executed according to the current dissolved oxygen content / current dissolved oxygen content average value and the current biological pool air inlet regulating valve opening / current biological pool air inlet regulating valve opening average value; when the comparison result is that the current dissolved oxygen content / current dissolved oxygen content average value is greater than The maximum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is less than the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, then the blower set pressure value is reduced based on the set first pressure change value; when the comparison result is that the current dissolved oxygen content / the current dissolved oxygen content average value is less than the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is greater than the biological pool air inlet regulating valve opening The blower set pressure value is increased based on the set first pressure change value if the maximum value of the threshold range of the dissolved oxygen content / the average value of the dissolved oxygen content and the opening of the air inlet regulating valve / the average value of the opening of the air inlet regulating valve of the biological pool is reached. Except for the above two comparison results, the blower set pressure value is not adjusted. The present invention adjusts the blower set pressure value based on the air-water ratio, the dissolved oxygen content / the average value of the dissolved oxygen content and the opening of the air inlet regulating valve / the average value of the opening of the air inlet regulating valve, so as to realize the joint control of the precision aeration system and the blower system. Under the premise of ensuring the stable operation of the blower, the blower system can realize automatic control while accurately and timely responding to the air supply demand of the precision aeration system, thereby realizing maximum energy saving and consumption reduction.

[0041] In one example, before obtaining the current gas-water ratio, the following steps are also included:

[0042] Set multiple time periods based on 24 hours and set the control cycle;

[0043] Set the gas-water ratio threshold range corresponding to each time period;

[0044] When the reclaimed water plant has only one biological pool, set the threshold range of dissolved oxygen content and the threshold range of opening of the biological pool air inlet regulating valve;

[0045] When the reclaimed water plant has multiple biological pools, set the average value threshold range of dissolved oxygen content and the average value threshold range of the biological pool air inlet regulating valve opening.

[0046] In one example, if the current gas-water ratio is within the gas-water ratio threshold range corresponding to the current time period, the current dissolved oxygen content / the current dissolved oxygen content average value and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value are obtained;

[0047] Compare the current dissolved oxygen content / the current dissolved oxygen content average with the dissolved oxygen content threshold range / the dissolved oxygen content average value threshold range, and also compare the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average with the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range;

[0048] The current blower control strategy is determined and executed based on the comparison results.

[0049] In one example, if the current dissolved oxygen content / the current dissolved oxygen content average value is greater than the maximum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is less than the minimum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, the blower set pressure value is reduced based on the set first pressure change value.

[0050] In one example, if the current dissolved oxygen content / the current dissolved oxygen content average value is less than the minimum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is greater than the maximum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, the blower set pressure value is increased based on the set first pressure change value.

[0051] In one example, except for the above two comparison results, the blower set pressure value is not adjusted.

[0052] In one example, if the current air-water ratio is greater than the maximum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is reduced based on the set second pressure change value.

[0053] In one example, if the current gas-water ratio is less than the minimum value of the gas-water ratio threshold range corresponding to the current time period, the set pressure value of the blower is increased based on the set second pressure change value.

[0054] In one example, the duration of the control cycle is less than the duration of the shortest time period.

[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0056] Embodiment 1

[0057] As Figure 2 shown, this embodiment provides an automatic control method for a blower in a reclaimed water plant, including:

[0058] 1. Configure a precise aeration system in the biological pool of the reclaimed water plant. The equipment mainly includes an online DO meter, a gas flow meter, an electric control valve, a pressure gauge, etc., to achieve real-time data transmission;

[0059] 2. Set the high value A of the average DO (dissolved oxygen content), and set the low value B of the average opening of the electric control valve; set the low value C of the average DO, and set the high value D of the average opening of the electric control valve; set the pressure change values ΔP and ΔP1; set N different time periods (N≥1), and set the upper limit value E of the gas-water ratio and the lower limit value F of the gas-water ratio for each time period. The set values of the upper and lower limits of the gas-water ratio for each time period can be different; set the interval time to T minutes;

[0060] 3. Every T minutes, obtain the actual gas-water ratio Q, determine which time period the current moment is in, and determine the upper and lower limit values of the gas-water ratio;

[0061] 4. Obtain the average DO value O, the average opening Y of the electric control valve, and the real-time data G of the pressure gauge;

[0062] 5. When F < Q < E, make the following judgments:

[0063] When O > A and Y < B, the set pressure value of the blower = G - ΔP;

[0064] When O < C and Y > D, the set pressure value of the blower = G + ΔP;

[0065] In other cases, the set pressure value of the blower = G, without adjustment;

[0066] 6. When Q < F, the set pressure value of the blower = G + ΔP1;

[0067] 7. When Q > E, the set pressure value of the blower = G - ΔP1.

[0068] Example 2

[0069] This embodiment provides an automatic control method for the blower in a reclaimed water plant, including:

[0070] 1. Configure a precise aeration system in the biological tank of the reclaimed water plant. The equipment mainly includes an on-line DO meter, a gas flow meter, an electric control valve, a pressure gauge, etc., to achieve real-time data transmission;

[0071] 2. Set the high value of the average DO to 2.5, and set the low value of the average opening of the electric control valve to 40; set the low value of the average DO to 1.0, and set the high value of the average opening of the electric control valve to 80; set the pressure change values to 0.05 bar and 0.08 bar; set 2 different time periods, namely 5:00 - 17:00 and 17:01 - 4:59. For the former, set the upper limit of the air-water ratio to 6 and the lower limit to 2, and for the latter, set the upper limit of the air-water ratio to 8 and the lower limit to 4; set the interval time to 30 minutes;

[0072] 3. Obtain the actual air-water ratio value Q every 30 minutes, determine which time period the current moment is in, and determine the upper and lower limits of the air-water ratio. Take 9:00 as an example below;

[0073] 4. Obtain the average DO value O, the average opening of the electric control valve Y, and the real-time data G of the pressure gauge;

[0074] 5. When 2 < Q < 6, make the following judgments:

[0075] When O > 2.5 and Y < 40, the set pressure value of the blower = G - 0.05;[[ID=二十二]]

[0076] When O < 1 and Y > 80, the set pressure value of the blower = G + 0.05;

[0077] In other cases, the set pressure value of the blower = G, without adjustment;

[0078] 6. When Q < 2, the set pressure value of the blower = G + 0.08;

[0079] 7. When Q > 6, the set pressure value of the blower = G - 0.08.

[0080] Example 3

[0081] As shown in Figure 3 This embodiment provides an automatic control system for the blower in a reclaimed water plant, including:

[0082] An acquisition module, used to acquire the current air-water ratio value;

[0083] A comparison module, used to compare the current air-water ratio value with the air-water ratio threshold range corresponding to the current time period;

[0084] The determination and execution module determines the current blower control strategy based on the comparison results and executes it.

[0085] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for automatically controlling a blower in a reclaimed water plant, characterized in that: include: Get the current gas-water ratio; Comparing the current gas-water ratio value with the gas-water ratio threshold range corresponding to the current time period; Determine the current blower control strategy based on the comparison results and execute it; Before obtaining the current gas-water ratio, the method further includes: Set multiple time periods based on 24 hours and set the control cycle; Setting the gas-water ratio threshold range corresponding to each of the time periods; When the reclaimed water plant has only one biological pool, set the threshold range of dissolved oxygen content and the threshold range of opening of the biological pool air inlet regulating valve; When the reclaimed water plant has multiple biological pools, set the average value threshold range of dissolved oxygen content and the average value threshold range of the opening of the biological pool air inlet regulating valve; If the current gas-water ratio is within the gas-water ratio threshold range corresponding to the current time period, the current dissolved oxygen content / the current dissolved oxygen content average value and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value are obtained; Comparing the current dissolved oxygen content / the current dissolved oxygen content average with the dissolved oxygen content threshold range / the dissolved oxygen content average value threshold range, and at the same time comparing the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average with the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range; The current blower control strategy is determined and executed based on the comparison results.

2. The automatic control method for the blower in a reclaimed water plant according to claim 1, characterized in that: If the current dissolved oxygen content / the current dissolved oxygen content average value is greater than the maximum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is less than the minimum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, the blower set pressure value is reduced based on the set first pressure change value.

3. The automatic control method for the blower in a reclaimed water plant according to claim 2, characterized in that: If the current dissolved oxygen content / the current dissolved oxygen content average value is less than the minimum value of the dissolved oxygen content threshold range / the current dissolved oxygen content average value threshold range, and the current biological pool air inlet regulating valve opening / the current biological pool air inlet regulating valve opening average value is greater than the maximum value of the biological pool air inlet regulating valve opening threshold range / the biological pool air inlet regulating valve opening average value threshold range, then the blower set pressure value is increased based on the set first pressure change value.

4. The automatic control method for the blower in a reclaimed water plant according to claim 3, characterized in that: Except for the above two comparison results, the blower set pressure value is not adjusted.

5. The automatic control method for blowers in a reclaimed water plant according to claim 1, characterized in that: If the current air-water ratio is greater than the maximum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is reduced based on the set second pressure change value.

6. The automatic control method for blowers in a reclaimed water plant according to claim 1, characterized in that: If the current air-water ratio is less than the minimum value of the air-water ratio threshold range corresponding to the current time period, the blower set pressure value is increased based on the set second pressure change value.

7. The automatic control method for blowers in a reclaimed water plant according to claim 1, characterized in that: The duration of the control cycle is shorter than the duration of the shortest time period.

8. A reclaimed water plant blower automatic control system, the system being used to execute the reclaimed water plant blower automatic control method according to any one of claims 1 to 7, characterized in that: include: Acquisition module, used to obtain the current gas-water ratio; a comparison module, configured to compare the current gas-water ratio value with a gas-water ratio threshold range corresponding to a current time period; The determination and execution module determines the current blower control strategy based on the comparison results and executes it.

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