System and method for optimizing operation of flue gas desulfurization device under flexible peak-shaving operating conditions of units

Abstract

Disclosed in the present application are a system and method for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving operating conditions of units. The system comprises an incoming flue gas duct from a unit A induced draft fan, a first damper, a unit A desulfurization absorption tower, an incoming flue gas duct from a unit B induced draft fan, a second damper, and a unit B desulfurization absorption tower, wherein the incoming flue gas duct from the unit A induced draft fan is in communication with an inlet of the unit A desulfurization absorption tower via the first damper; the incoming flue gas duct from the unit A induced draft fan is in communication with the incoming flue gas duct from the unit B induced draft fan via a connecting duct; the incoming flue gas duct from the unit B induced draft fan is in communication with an inlet of the unit B desulfurization absorption tower via the second damper; and a third damper is provided on the connecting duct. The system and method can effectively ensure the pollutant removal effect of a desulfurization system under medium- and low-load operating conditions and reduce the overall operating energy consumption of the system.

Description

Optimized Operation System and Methods for Flue Gas Desulfurization Units under Flexible Peak Shaving Conditions

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510184937.7, filed on February 19, 2025, entitled "Optimized Operation System and Method for Flue Gas Desulfurization Device under Flexible Peak Shaving Conditions of Units", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of air pollution control technology, and relates to an optimized operation system and method for flue gas desulfurization device under flexible peak-shaving conditions of power units. Background Technology

[0004] Currently, domestic coal-fired power plants have basically completed ultra-low emission retrofits for their environmental protection facilities. Considering the stable compliance of pollutant emissions and the safety and reliability of equipment, desulfurization systems are all set up as units, meaning one desulfurization system is configured for each generating unit. With the rapid development of new energy sources such as wind and solar power, the load rate of coal-fired generating units has been declining year by year, and deep peak shaving is frequent. This causes the desulfurization system to operate off-design conditions for extended periods. When the flue gas velocity in the desulfurization absorption tower is too low, the gas-liquid mass transfer efficiency decreases, and the performance of the demister deteriorates. Therefore, ensuring the pollutant removal efficiency of the desulfurization system under low-to-medium load conditions during flexible peak shaving, and reducing the energy consumption of the desulfurization system while ensuring compliance with emission standards, is of great significance. Summary of the Invention

[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide an optimized operation system and method for flue gas desulfurization devices under flexible peak-shaving conditions. This system and method can effectively ensure the pollutant removal effect of the desulfurization system under medium and low load conditions and reduce the overall operating energy consumption of the system.

[0006] To achieve the above objectives, this application discloses an optimized operation system for flue gas desulfurization devices under flexible peak-shaving conditions, including a flue gas duct from the induced draft fan of Unit A, a first damper, a desulfurization absorption tower of Unit A, a flue gas duct from the induced draft fan of Unit B, a second damper, and a desulfurization absorption tower of Unit B.

[0007] The flue gas duct from the induced draft fan of Unit A is connected to the inlet of the desulfurization absorption tower of Unit A via a first baffle gate. The flue gas duct from the induced draft fan of Unit A is connected to the flue gas duct from the induced draft fan of Unit B via a connecting pipe. The flue gas duct from the induced draft fan of Unit B is connected to the inlet of the desulfurization absorption tower of Unit B via a second baffle gate. A third baffle gate is installed on the connecting pipe.

[0008] The further improvement of the optimized operation system of the flue gas desulfurization device under flexible peak-shaving conditions described in this application lies in:

[0009] Optionally, a chimney is also included, with the flue gas outlet of the desulfurization absorption tower of Unit A connected to the inlet of the chimney via the first exhaust pipe.

[0010] Optionally, the flue gas outlet of the desulfurization absorption tower of Unit B is connected to the inlet of the chimney via a second exhaust pipe.

[0011] Optionally, a first flue gas online monitoring system is installed on the flue gas duct of the induced draft fan of Unit A.

[0012] Optionally, a second online flue gas monitoring system is installed on the flue gas duct of Unit B's induced draft fan.

[0013] Optionally, a third flue gas online monitoring system may be installed on the first exhaust duct.

[0014] Optionally, a fourth flue gas online monitoring system may be installed on the second exhaust duct.

[0015] Optionally, it also includes a controller, the output of which is connected to the first baffle door, the second baffle door and the third baffle door.

[0016] This application discloses a method for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving conditions, including:

[0017] Obtain the load factor of Unit A;

[0018] Obtain the load factor of Unit B;

[0019] When the sum of the load rates of Unit A and Unit B is greater than or equal to 100%, the first damper door is opened, the second damper door is opened, and the third damper door is closed.

[0020] When the sum of the load rates of Unit A and Unit B is less than 100%, the third damper door is opened, the first damper door is closed, or the second damper door is closed.

[0021] The further improvement of the optimized operation method of flue gas desulfurization device under flexible peak-shaving conditions described in this application lies in:

[0022] Optionally, a chimney is also included, with the flue gas outlet of the desulfurization absorption tower of Unit A connected to the inlet of the chimney via the first exhaust pipe;

[0023] The flue gas outlet of the desulfurization absorption tower of Unit B is connected to the inlet of the chimney via the second exhaust pipe.

[0024] This application has the following beneficial effects:

[0025] The optimized operation system and method for flue gas desulfurization devices under flexible peak-shaving conditions described in this application, in specific operation, involves setting up connecting flues. Both the connecting flues and the inlet flue of the absorption tower are equipped with dampers. When the sum of the load rates of the two units exceeds 100% of the load of a single unit, the third damper is closed, and operation proceeds according to the normal unit-based operation mode. When the sum of the load rates of the two units is lower than 100% of the load of a single unit, the third damper is opened, while the first or second damper is closed, placing one of the absorption towers in a standby state. This ensures the pollutant removal effect of the desulfurization system under medium and low load conditions and reduces the overall operating energy consumption of the system. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 is a system architecture diagram of this application.

[0028] Among them, 1 is the flue gas duct from the induced draft fan of Unit A, 2 is the flue gas duct from the induced draft fan of Unit B, 3 is the desulfurization absorption tower of Unit A, 4 is the desulfurization absorption tower of Unit B, 5 is the first damper, 6 is the second damper, 7 is the third damper, 8 is the first flue gas online monitoring system, 9 is the second flue gas online monitoring system, 10 is the third flue gas online monitoring system, and 11 is the fourth flue gas online monitoring system. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this application specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this application generally indicates that the preceding and following objects are in an "or" relationship.

[0033] It should be understood that although terms such as first, second, third, etc., may be used to describe preset ranges in the embodiments of this application, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from one another. For example, without departing from the scope of the embodiments of this application, 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.

[0034] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] The accompanying drawings illustrate various structural schematics according to embodiments disclosed in this application. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0037] As is generally known, a flue gas online monitoring system, or CEMS (Continuous Emission Monitoring System), is a device that continuously monitors the concentration and total emissions of gaseous pollutants and particulate matter emitted from air pollution sources, and transmits the pollution source emission information in real time to the online monitoring system of the environmental protection authorities. The following is a detailed introduction to the flue gas online monitoring system: The flue gas online monitoring system mainly consists of the following four subsystems: Gaseous pollutant monitoring subsystem: mainly used to monitor the concentration and total emissions of gaseous pollutants such as SO2 and NOx. Particulate matter monitoring subsystem: mainly used to monitor the concentration and total emissions of particulate matter. Flue gas parameter monitoring subsystem: mainly used to measure parameters such as flue gas velocity, flue gas temperature, flue gas pressure, flue gas oxygen content, and flue gas humidity. These parameters are used for the total emission calculation and the conversion of relevant concentrations. Data acquisition, processing, and communication subsystem: composed of a data acquisition unit and a computer system, it collects various parameters in real time, generates dry-basis, wet-basis, and converted concentrations for each concentration value, generates daily, monthly, and annual cumulative emissions, compensates for lost data, and transmits reports to the relevant authorities in real time.

[0038] Example 1

[0039] Referring to Figure 1, the optimized operation system of the flue gas desulfurization device under flexible peak-shaving conditions described in this application includes: flue gas duct 1 from the induced draft fan of Unit A, flue gas duct 2 from the induced draft fan of Unit B, desulfurization absorption tower 3 of Unit A, desulfurization absorption tower 4 of Unit B, first damper 5, second damper 6, third damper 7, first flue gas online monitoring system 8, second flue gas online monitoring system 9, third flue gas online monitoring system 10, and fourth flue gas online monitoring system 11;

[0040] The flue gas duct 1 from the induced draft fan of Unit A is connected to the inlet of the desulfurization absorption tower 3 of Unit A via the first damper gate 5. The flue gas outlet of the desulfurization absorption tower 3 of Unit A is connected to the inlet of the chimney via the first exhaust duct. The flue gas duct 2 from the induced draft fan of Unit B is connected to the inlet of the desulfurization absorption tower 4 of Unit B via the second damper gate 6. The flue gas outlet of the desulfurization absorption tower 4 of Unit B is connected to the inlet of the chimney via the second exhaust duct.

[0041] The flue gas duct 1 of Unit A's induced draft fan is connected to the flue gas duct 2 of Unit B's induced draft fan via a connecting pipe, and a third baffle 7 is installed on the connecting pipe.

[0042] The first flue gas online monitoring system 8 is installed on the flue gas duct 1 of the induced draft fan of Unit A, and the second flue gas online monitoring system 9 is installed on the flue gas duct 2 of the induced draft fan of Unit B; the third flue gas online monitoring system 10 is installed on the first exhaust duct, and the fourth flue gas online monitoring system 11 is installed on the second exhaust duct.

[0043] In this embodiment, a controller is also included. The input terminal of the controller is connected to the first flue gas online monitoring system 8, the second flue gas online monitoring system 9, the third flue gas online monitoring system 10 and the fourth flue gas online monitoring system 11, and the output terminal of the controller is connected to the first baffle door 5, the second baffle door 6 and the third baffle door 7.

[0044] It should be noted that this application involves setting up connecting flues at the inlet flues of the desulfurization absorption towers for the two existing units (with the same capacity). Both the connecting flues and the inlet flues of the absorption towers are equipped with dampers. When the sum of the load rates of the two units exceeds 100% of the load of a single unit, the third damper 7 is closed, and the system operates in normal unit mode. When the sum of the load rates of the two units is lower than 100% of the load of a single unit, the third damper is opened, and the first damper 5 or the second damper 6 is closed simultaneously, putting one of the absorption towers in a standby state. This application utilizes the existing desulfurization system configuration, requires minimal modification, and can effectively avoid the reduction in gas-liquid mass transfer efficiency and demister performance caused by excessively low flue gas velocity in the desulfurization tower when the unit load rate is low. This ensures the operating performance of the desulfurization system under medium and low load conditions and reduces overall operating energy consumption.

[0045] Example 2

[0046] The optimized operation method for flue gas desulfurization devices under flexible peak-shaving conditions described in this application includes the following steps:

[0047] Obtain the load factor of Unit A;

[0048] Obtain the load factor of Unit B;

[0049] When the sum of the load rates of Unit A and Unit B is greater than or equal to 100%, the first damper door 5 is opened, the second damper door 6 is opened, and the third damper door 7 is closed.

[0050] When the sum of the load rates of Unit A and Unit B is less than 100%, the third damper door 7 is opened, the first damper door 5 is closed, or the second damper door 6 is closed.

[0051] Example 3

[0052] The controller described in this application includes:

[0053] The first acquisition module is used to acquire the load rate of Unit A.

[0054] The second acquisition module is used to acquire the load rate of Unit B.

[0055] The control module is used to control the first damper door 5 to open, the second damper door 6 to open, and the third damper door 7 to close when the sum of the load rates of unit A and unit B is greater than or equal to 100%; and to control the third damper door 7 to open, the first damper door 5 to close, or the second damper door 6 to close when the sum of the load rates of unit A and unit B is less than 100%.

[0056] The module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in each embodiment of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0057] Example 4

[0058] 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 steps for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving conditions. For example, the steps include: obtaining the load rate of unit A; obtaining the load rate of unit B; when the sum of the load rates of unit A and unit B is greater than or equal to 100%, controlling the first damper 5 to open, the second damper 6 to open, and the third damper 7 to close; when the sum of the load rates of unit A and unit B is less than 100%, controlling the third damper 7 to open, and the first damper 5 or the second damper 6 to close. The memory may include main memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which can be an industry standard architecture bus, a peripheral component interconnection standard bus, an extended industry standard architecture bus, etc. The bus can be divided into address bus, data bus, control bus, etc. The memory is used to store programs; specifically, the program may include program code, which includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0059] Example 5

[0060] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of an optimized operation method for a flue gas desulfurization device under flexible peak-shaving conditions. For example, the method includes: obtaining the load rate of unit A; obtaining the load rate of unit B; when the sum of the load rates of unit A and unit B is greater than or equal to 100%, controlling the first damper 5 to open, the second damper 6 to open, and the third damper 7 to close; when the sum of the load rates of unit A and unit B is less than 100%, controlling the third damper 7 to open, and the first damper 5 or the second damper 6 to close. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0061] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0062] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0063] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0064] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0065] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0066] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

[0067] The above description is merely a preferred embodiment of this application and does not constitute any limitation on this application. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of this application shall still fall within the protection scope of the technical solution of this application.

Claims

1. A system for optimizing operation of a flue gas desulfurization device in a flexible peak load operation mode of a power unit, characterized in that, Including the flue gas duct from the induced draft fan of Unit A (1), the first damper (5), the desulfurization absorption tower of Unit A (3), the flue gas duct from the induced draft fan of Unit B (2), the second damper (6), and the desulfurization absorption tower of Unit B (4); The flue gas duct (1) from the induced draft fan of Unit A is connected to the inlet of the desulfurization absorption tower (3) of Unit A via the first baffle gate (5). The flue gas duct (1) from the induced draft fan of Unit A is connected to the flue gas duct (2) from the induced draft fan of Unit B via a connecting pipe. The flue gas duct (2) from the induced draft fan of Unit B is connected to the inlet of the desulfurization absorption tower (4) of Unit B via the second baffle gate (6). A third baffle gate (7) is provided on the connecting pipe.

2. The system of claim 1, wherein, It also includes the chimney. The flue gas outlet of the desulfurization absorption tower (3) of Unit A is connected to the inlet of the chimney through the first exhaust pipe.

3. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 1, characterized in that, The flue gas outlet of the desulfurization absorption tower (4) of Unit B is connected to the inlet of the chimney via the second exhaust pipe.

4. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 1, characterized in that, The first flue gas online monitoring system (8) is installed on the flue gas duct (1) of the induced draft fan of Unit A.

5. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 1, characterized in that, A second flue gas online monitoring system (9) is installed on the flue gas duct (2) of the induced draft fan of Unit B.

6. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 2, characterized in that, A third flue gas online monitoring system (10) is installed on the first exhaust duct.

7. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 3, characterized in that, The second exhaust duct is equipped with a fourth flue gas online monitoring system (11).

8. The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 1, characterized in that, It also includes a controller, the output of which is connected to the first baffle door (5), the second baffle door (6) and the third baffle door (7).

9. A method for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving conditions of a generating unit, characterized in that, The optimized operation system for flue gas desulfurization device under flexible peak-shaving conditions of the unit as described in claim 1 includes: Obtain the load factor of Unit A; Obtain the load factor of Unit B; When the sum of the load rates of Unit A and Unit B is greater than or equal to 100%, the first baffle door (5) is opened, the second baffle door (6) is opened, and the third baffle door (7) is closed. When the sum of the load rates of Unit A and Unit B is less than 100%, the third baffle door (7) is opened, the first baffle door (5) is closed, or the second baffle door (6) is closed.

10. The optimized operation method of the flue gas desulfurization device under flexible peak-shaving conditions of the unit according to claim 9, characterized in that, It also includes the chimney. The flue gas outlet of the desulfurization absorption tower (3) of Unit A is connected to the inlet of the chimney through the first exhaust pipe. The flue gas outlet of the desulfurization absorption tower (4) of Unit B is connected to the inlet of the chimney via the second exhaust pipe.

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