Feedforward early warning and control method and system for pH adjusting tank of industrial wastewater system of thermal power plant

Abstract

The invention discloses a feedforward early warning and control method and system for a pH adjusting tank of a thermal power plant industrial wastewater system. The method comprises the steps that the pH value of water at an outlet of a wastewater conveying pump is measured; the alkali dosing metering pump and the acid dosing metering pump are controlled to work according to the pH value of the water at the outlet of the wastewater delivery pump, and the method and the system can adjust the pH value of the wastewater in the industrial wastewater system.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and relates to a feedforward warning and control method and system for a pH adjustment tank in an industrial wastewater system of a thermal power plant. Background Art

[0002] The wastewater generated by thermal power plants often contains acids or alkalis. During the wastewater treatment process, it is necessary to neutralize the corresponding acids or alkalis in the pH adjustment tank according to the results measured by the on-line instrument. When adding acids or alkalis, the stirring device of the pH adjustment device will also be started simultaneously to fully mix the added acid or alkali agents with the wastewater, so as to achieve the purpose of accurately controlling the pH. However, in field applications, after the acid or alkali agents are added and stirred and mixed by the stirrer, affected by the long measurement time of the pH meter, the measured data has a delay. It is difficult to accurately control the dosage and dosing time of the added medicine. When the input amount of the added medicine is small, the pH cannot be controlled within the required range. When the medicine is added in excess, there is not only a risk of overshoot, but also a waste of the medicine. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provide a feedforward warning and control method and system for a pH adjustment tank in an industrial wastewater system of a thermal power plant, which can adjust the pH value of the wastewater in the industrial wastewater system.

[0004] To achieve the above purpose, the present invention discloses a feedforward warning and control method for a pH adjustment tank in an industrial wastewater system of a thermal power plant, including:

[0005] Measuring the pH value of the water at the outlet of the wastewater transfer pump;

[0006] Controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump.

[0007] A further improvement of the feedforward warning and control method for a pH adjustment tank in the industrial wastewater system of the thermal power plant according to the present invention is as follows:

[0008] Further, when the pH value of the water at the outlet of the wastewater transfer pump is less than 6.5, calculate the running time t of the alkali dosing metering pump within a cycle T, and control the alkali dosing metering pump to add alkali solution to the wastewater according to the calculated running time t of the alkali dosing metering pump within a cycle T.

[0009] Further, the calculation formula for the running time t of the alkali dosing metering pump within a cycle T is:

[0010] t / T = 5Q(10 -E -10 -F ) / 54qp

[0011] Wherein, E is the pH value of the water at the outlet of the wastewater transfer pump measured, q is the rated output of the alkali dosing metering pump, p is the stroke of the alkali dosing metering pump, F is the target pH value, and Q is the flow rate at the main pipe outlet of the wastewater transfer pump.

[0012] Further, within the statistical period T, the actual working duration of the alkali dosing metering pump is counted. When the calculated running time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operating personnel to remind them to replenish the medicine or stop dosing in time.

[0013] Further, when the pH value of the water at the outlet of the wastewater transfer pump is greater than 8.5, the running time t of the acid dosing metering pump within a period T is calculated, and the acid dosing metering pump is controlled to add acid liquid to the wastewater according to the calculated running time t of the acid dosing metering pump within a period T.

[0014] Further, the calculation formula for the running time t of the acid dosing metering pump within a period T is:

[0015] t / T = 36.5Q(10 -14+K -10 -14+L ) / 371.2qp

[0016] Wherein, K is the pH value of the water at the outlet of the wastewater transfer pump measured, q is the rated output of the acid dosing pump, p is the stroke of the acid dosing pump, L is the target pH value, and Q is the flow rate at the main pipe outlet of the wastewater transfer pump.

[0017] Further, within the statistical period T, the actual working duration of the acid dosing metering pump is counted. When the calculated running time t of the acid dosing metering pump is not equal to the actual working duration of the acid dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operating personnel to remind them to replenish the medicine or stop dosing in time.

[0018] The present invention discloses a feed-forward early warning system for the pH adjustment tank of the industrial wastewater system of a thermal power plant, including:

[0019] A measurement module for measuring the pH value of the water at the outlet of the wastewater transfer pump;

[0020] A control module for controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump.

[0021] The present invention discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the feed-forward early warning and control method for the pH adjustment tank of the industrial wastewater system of the thermal power plant are implemented.

[0022] The present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the pH adjustment tank feedforward warning and control method for the industrial wastewater system of a thermal power plant.

[0023] The present invention has the following beneficial effects:

[0024] When the pH adjustment tank feedforward warning and control method and system for the industrial wastewater system of a thermal power plant according to the present invention are specifically operated, according to the pH value of the water at the outlet of the wastewater transfer pump, the alkali dosing metering pump and the acid dosing metering pump are controlled to work to achieve the feedforward control of the pH adjustment tank. At the same time, within the statistical period T, the actual working duration of the alkali dosing metering pump is counted. When the calculated operating time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, an alarm signal is issued; within the statistical period T, the actual working duration of the acid dosing metering pump is counted. When the calculated operating time t of the acid dosing metering pump is not equal to the actual working duration of the acid dosing metering pump, an alarm signal is issued, preventing insufficient dosing from causing the pH not to meet the effluent water quality conditions of the industrial wastewater system, and at the same time, excessive dosing resulting in waste of drugs and causing consequences such as environmental unfriendliness or uneconomicalness. Description of the Drawings

[0025] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is the method flow chart of the present invention. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0029] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0030] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the preceding and following related objects.

[0031] It should be understood that although terms such as first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0032] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where for the purpose of clear expression, certain details are enlarged and certain details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual requirements.

[0035] Embodiment 1

[0036] The pH feedforward early warning and control method for the industrial wastewater system of a thermal power plant according to the present invention includes the following steps:

[0037] Judge whether the wastewater transfer pump is started. When the wastewater transfer pump is started, collect the pH value of the water at the outlet of the wastewater transfer pump and the main pipe outlet flow rate information Q of the wastewater transfer pump.

[0038] When the measured pH value is less than 6.5, control the alkali dosing metering pump to start and add alkali to the wastewater. Among them, the running time t of the alkali dosing metering pump within a cycle T is as follows:

[0039] Let E be the measured pH value, q be the rated output of the alkali dosing pump, p be the stroke of the alkali dosing pump, the concentration of the added alkali solution is 35%, and the density is 1.35 g / cm 3 , the molar mass of NaOH is 40 g / mol, and F is the target pH value;

[0040]

[0041] Then t / T = 5Q(10 -E -10 -F ) / 54qp

[0042] Considering the on-site equipment situation, when T = 0.5 h, then t (h) = 5Q(10 -E -10 -F ) / 27qp.

[0043] When the measured pH value is greater than 8.5, control the acid dosing metering pump to start and add acid to the wastewater to adjust the pH value of the wastewater. Among them, the running time t of the acid dosing metering pump within a cycle T is as follows:

[0044] Let K be the measured pH value, q (L / h) be the rated output of the acid dosing pump, p be the stroke of the acid dosing pump, the concentration of the added acid solution is 32%, and the density is 1.16 g / cm 3 , the molar mass of HCl is 36.5 g / mol, and L is the target pH value. Then the running time t of the acid dosing metering pump within a cycle T is:

[0045]

[0046] Then t / T = 36.5Q(10 -14+K -10 -14+L ) / 371.2qp

[0047] Considering the on-site equipment situation, T = 0.5h, then t(h) = 73Q(10 -14+K -10 -14+L ) / 371.2qp.

[0048] As an embodiment of the present invention, it further includes: within the statistical period T, the actual working duration of the acid dosing metering pump and the actual working duration of the alkali dosing metering pump.

[0049] As an embodiment of the present invention, it further includes: when within one cycle T, when the calculated running time t of the acid dosing metering pump is not equal to the actual working duration of the acid dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operator to remind to replenish the medicine or stop dosing in time; when the calculated running time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operator to remind to replenish the medicine or stop dosing in time.

[0050] Embodiment 2

[0051] The pH adjustment tank feedforward early warning system for the industrial wastewater system of the thermal power plant described in the present invention includes:

[0052] A measurement module for measuring the pH value of the water at the outlet of the wastewater transfer pump;

[0053] A control module for controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump.

[0054] In this embodiment, when the pH value of the water at the outlet of the wastewater transfer pump is less than 6.5, the running time t of the alkali dosing metering pump within one cycle T is calculated, and the alkali dosing metering pump is controlled to add alkali solution to the wastewater according to the calculated running time t of the alkali dosing metering pump within one cycle T.

[0055] In this embodiment, the calculation formula for the running time t of the alkali dosing metering pump within one cycle T is:

[0056] t / T = 5Q(10 -E -10 -F ) / 54qp

[0057] Among them, E is the pH value of the water at the outlet of the wastewater transfer pump measured, q is the rated output of the alkali dosing metering pump, p is the stroke of the alkali dosing metering pump, F is the target pH value, and Q is the main pipe outlet flow of the wastewater transfer pump.

[0058] In this embodiment, within the statistical period T, the actual working duration of the alkali dosing metering pump is counted. When the calculated running time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operator to remind to replenish the medicine or stop dosing in time.

[0059] In this embodiment, when the pH value of the water at the outlet of the wastewater transfer pump is greater than 8.5, the running time t of the acid dosing metering pump within a period T is calculated, and the acid dosing metering pump is controlled to add acid liquid to the wastewater according to the calculated running time t of the acid dosing metering pump within a period T.

[0060] In this embodiment, the calculation formula for the running time t of the acid dosing metering pump within a period T is:

[0061] t / T = 36.5Q(10 -14+K -10 -14+L ) / 371.2qp

[0062] Among them, K is the pH value of the water at the outlet of the wastewater transfer pump measured, q is the rated output of the acid dosing pump, p is the stroke of the acid dosing pump, L is the target pH value, and Q is the main pipe outlet flow of the wastewater transfer pump.

[0063] In this embodiment, within the statistical period T, the actual working duration of the acid dosing metering pump is counted. When the calculated running time t of the acid dosing metering pump is not equal to the actual working duration of the acid dosing metering pump, an alarm signal is sent and the alarm signal is pushed to the operator to remind to replenish the medicine or stop dosing in time.

[0064] The division of modules in the embodiments of the present application is illustrative, only a logical function division. In actual implementation, there may be other division methods. In addition, in each embodiment of the present application, each functional module can be integrated in a processor, can also exist separately physically, or two or more modules can be integrated in one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0065] Embodiment III

[0066] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the feedforward warning and control method for the pH adjustment tank of the industrial wastewater system in a thermal power plant. For example, it includes: measuring the pH value of the water at the outlet of the wastewater transfer pump; controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump, and counting the actual working duration of the alkali dosing metering pump within the statistical period T. When the calculated operating time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, an alarm signal is sent and pushed to the operating personnel to remind them to replenish the medicine or stop dosing in a timely manner. Among them, the memory may include internal memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk memory, etc.; the processor, network interface, and memory are interconnected through an internal bus, and this internal bus can be an Industry Standard Architecture bus, a Peripheral Component Interconnect standard bus, an Extended Industry Standard Architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program can include program code, and the program code includes computer operation instructions. The memory can include internal memory and non-volatile memory and provide instructions and data to the processor.

[0067] Embodiment 4

[0068] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, it implements the steps of the feedforward warning and control method for the pH adjustment tank of the industrial wastewater system in a thermal power plant. For example, it includes: measuring the pH value of the water at the outlet of the wastewater transfer pump; controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump. Specifically, the computer-readable storage medium includes but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory can include random access memory and / or cache memory, etc. The non-volatile memory can include read-only memory, hard disk, flash memory, optical disc, magnetic disk, etc.

[0069] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0070] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for implementing the functions specified in one block or multiple blocks.

[0071] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for implementing the functions specified in one block or multiple blocks.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for implementing the functions specified in one block or multiple blocks.

[0073] Those skilled in the art will readily conceive of other embodiments of the present invention upon considering the specification and the disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and the embodiments are only exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0074] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0075] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

1. A feedforward early warning and control method for the pH adjustment tank of the industrial wastewater system in a thermal power plant, characterized in that, Including: Measuring the pH value of the water at the outlet of the wastewater transfer pump; Controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump.

2. The pH adjustment tank feedforward warning and control method for the industrial wastewater system of a thermal power plant according to claim 1, characterized in that, When the pH value of the water at the outlet of the wastewater transfer pump is less than 6.5, calculate the running time t of the alkali dosing metering pump within a cycle T, and control the alkali dosing metering pump to add alkali solution to the wastewater according to the calculated running time t of the alkali dosing metering pump within a cycle T.

3. The pH adjustment tank feedforward warning and control method for the industrial wastewater system of a thermal power plant according to claim 2, characterized in that, The calculation formula for the running time t of the alkali dosing metering pump within a cycle T is: t / T = 5Q(10 -E -10 -F ) / 54qp Wherein, E is the measured pH value of the water at the outlet of the wastewater transfer pump, q is the rated output of the alkali dosing metering pump, p is the stroke of the alkali dosing metering pump, F is the target pH value, and Q is the main pipe outlet flow of the wastewater transfer pump.

4. The pH adjustment tank feedforward early warning and control method for the industrial wastewater system of a thermal power plant according to claim 1, characterized in that, During the statistical cycle T, count the actual working duration of the alkali dosing metering pump. When the calculated running time t of the alkali dosing metering pump is not equal to the actual working duration of the alkali dosing metering pump, send an alarm signal and push the alarm signal to the operator to remind to replenish the medicine or stop dosing in time.

5. The pH adjustment tank feedforward early warning and control method for the industrial wastewater system of a thermal power plant according to claim 1, characterized in that, When the pH value of the water at the outlet of the wastewater transfer pump is greater than 8.5, calculate the running time t of the acid dosing metering pump within a cycle T, and control the acid dosing metering pump to add acid solution to the wastewater according to the calculated running time t of the acid dosing metering pump within a cycle T.

6. The pH adjustment tank feedforward early warning and control method for the industrial wastewater system of a thermal power plant according to claim 5, characterized in that, The calculation formula for the running time t of the acid dosing metering pump within a cycle T is: t / T = 36.5Q(10 -14+K - 10 -14+L ) / 371.2qp Wherein, K is the measured pH value of the water at the outlet of the wastewater transfer pump, q is the rated output of the acid dosing pump, p is the stroke of the acid dosing pump, L is the target pH value, and Q is the main pipe outlet flow of the wastewater transfer pump.

7. The pH adjustment tank feedforward early warning and control method for the industrial wastewater system of a thermal power plant according to claim 5, characterized in that, During the statistical cycle T, count the actual working duration of the acid dosing metering pump. When the calculated running time t of the acid dosing metering pump is not equal to the actual working duration of the acid dosing metering pump, send an alarm signal and push the alarm signal to the operator to remind to replenish the medicine or stop dosing in time.

8. A feedforward early warning system for the pH adjustment tank of the industrial wastewater system in a thermal power plant, characterized in that, Including: A measuring module for measuring the pH value of the water at the outlet of the wastewater transfer pump; A control module for controlling the operation of the alkali dosing metering pump and the acid dosing metering pump according to the pH value of the water at the outlet of the wastewater transfer pump.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the pH adjustment tank feedforward warning and control method for the industrial wastewater system of a thermal power plant as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the pH adjustment tank feedforward warning and control method for the industrial wastewater system of a thermal power plant as described in any one of claims 1-7.

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