Optimized operation system and method for flue gas desulfurization device under working condition of flexible peak regulation of unit

Abstract

The invention discloses a system and a method for optimizing operation of a flue gas desulfurization device under the working condition of flexible peak regulation of a unit. The system comprises an A unit induced draft fan flue gas coming pipeline, a first baffle door, an A unit desulfurization absorption tower, a B unit induced draft fan flue gas coming pipeline, a second baffle door and a B unit desulfurization absorption tower, a flue gas pipeline of the induced draft fan of the unit A is communicated with an inlet of the desulfurizing absorption tower of the unit A through a first baffle door, the flue gas pipeline of the induced draft fan of the unit A is communicated with a flue gas pipeline of the induced draft fan of the unit B through a connecting pipeline, and the flue gas pipeline of the induced draft fan of the unit B is communicated with an inlet of the desulfurizing absorption tower of the unit B through a second baffle door; according to the system and the method, the pollutant removal effect of the desulfurization system under the medium-low load working condition can be effectively guaranteed, and the comprehensive operation energy consumption of the system can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of air pollution control, and relates to a system and method for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving conditions of a unit. Background Art

[0002] At present, domestic coal-fired power plants have basically completed the ultra-low emission transformation of environmental protection facilities. Considering the stable compliance of pollutant indicators and the safety and reliability of equipment, the desulfurization systems are all set up in a unit system, that is, one unit is equipped with a desulfurization system. With the rapid development of new energy sources such as wind and solar power, the load rate of coal-based power generation units has declined year by year, and deep peak regulation has been frequent, causing the desulfurization system to deviate from the design conditions for a long time. When the flue gas flow rate in the desulfurization absorption tower is too low, the gas-liquid mass transfer reaction efficiency is reduced, and the demister performance is reduced. How to ensure the pollutant removal effect of the desulfurization system under medium and low load conditions during flexible peak regulation and reduce the operating energy consumption of the desulfurization system under the premise of meeting the pollutant emission standards is of great significance. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a system and method for optimizing the operation of a flue gas desulfurization device under flexible peak-shaving conditions of the unit. The system and method can effectively ensure the pollutant removal effect of the desulfurization system under medium and low load conditions and reduce the comprehensive operating energy consumption of the system.

[0004] To achieve the above-mentioned object, the present invention discloses an optimized operation system of a flue gas desulfurization device under flexible peak load conditions of a unit, comprising a flue gas duct from an induced draft fan of unit A, a first damper door, a desulfurization absorption tower of unit A, a flue gas duct from an induced draft fan of unit B, a second damper door and a desulfurization absorption tower of unit B;

[0005] 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 through the first baffle door, 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 through the 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 through the second baffle door, and a third baffle door is provided on the connecting pipe.

[0006] The further improvement of the flue gas desulfurization device optimization operation system under the flexible peak load condition of the unit described in the present invention is:

[0007] Furthermore, it also includes a chimney, and the flue gas outlet of the desulfurization absorption tower of unit A is connected with the inlet of the chimney through the first smoke exhaust pipe.

[0008] Furthermore, the flue gas outlet of the desulfurization absorption tower of unit B is connected to the inlet of the chimney through the second flue gas exhaust duct.

[0009] Furthermore, a first flue gas online monitoring system is provided on the flue gas duct from the induced draft fan of unit A.

[0010] Furthermore, a second flue gas online monitoring system is provided on the flue gas duct of the induced draft fan of unit B.

[0011] Furthermore, a third flue gas online monitoring system is provided on the first smoke exhaust duct.

[0012] Furthermore, a fourth flue gas online monitoring system is provided on the second smoke exhaust duct.

[0013] Furthermore, it also includes a controller, the output end of the controller is connected to the first baffle door, the second baffle door and the third baffle door.

[0014] The present invention discloses a method for optimizing the operation of a flue gas desulfurization device under a flexible peak-shaving condition of a unit, comprising:

[0015] Get the load factor of unit A;

[0016] Get the load factor of unit B;

[0017] When the sum of the load factor of unit A and the load factor of unit B is greater than or equal to 100%, the first damper door is controlled to open, the second damper door is controlled to open, and the third damper door is controlled to close;

[0018] When the sum of the load factor of unit A and the load factor of unit B is less than 100%, the third damper door is controlled to open, the first damper door is controlled to close, or the second damper door is controlled to close.

[0019] The further improvement of the method for optimizing the operation of the flue gas desulfurization device under the flexible peak load regulation condition of the unit described in the present invention is:

[0020] Furthermore, it also includes a chimney, wherein the flue gas outlet of the desulfurization absorption tower of unit A is connected to the inlet of the chimney through a first flue gas exhaust duct;

[0021] The flue gas outlet of the desulfurization absorption tower of unit B is connected to the inlet of the chimney through the second flue gas exhaust duct.

[0022] The present invention has the following beneficial effects:

[0023] The system and method for optimizing the operation of the flue gas desulfurization device under the flexible peak load condition of the unit described in the present invention are specifically operated, and a connecting flue is provided, and a damper door is provided at the connecting flue and the inlet flue of the absorption tower. When the sum of the load rates of the two units exceeds the 100% load condition of a single unit, the third damper door is closed, and the operation is carried out in a normal unit operation mode. When the sum of the load rates of the two units is lower than the 100% load condition of a single unit, the third damper door is opened, and the first damper door or the second damper door is closed at the same time, so that one of the absorption towers is in a standby state, ensuring the pollutant removal effect of the desulfurization system under medium and low load conditions and reducing the comprehensive operation energy consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary 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 accompanying drawings:

[0025] Figure 1 It is a system structure diagram of the present invention.

[0026] 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 baffle door, 6 is the second baffle door, 7 is the third baffle door, 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 DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of 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 collections thereof.

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

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

[0031] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish 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] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0033] In order to make the purpose, 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 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. The components of the embodiments of the present invention described and shown in the drawings here can usually 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 invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0035] As is known, the flue gas online monitoring system, referred to as CEMS (Continuous Emission Monitoring System), is a device that continuously monitors the concentration and total amount of gaseous pollutants and particulate matter emitted by air pollution sources, and transmits the emission information of the pollution source to the online monitoring system of the ecological environment protection department in real time. The following is a detailed introduction to the flue gas online monitoring system: The flue gas online monitoring system is mainly composed of the following four subsystems: Gaseous pollutant monitoring subsystem: mainly used to monitor the concentration and total amount of gaseous pollutants such as SO2, NOx, etc. Particle monitoring subsystem: mainly used to monitor the concentration and total amount of smoke dust emissions. Flue gas parameter monitoring subsystem: mainly used to measure parameters such as flue gas flow rate, flue gas temperature, flue gas pressure, flue gas oxygen content, flue gas humidity, etc. These parameters are used for the accumulation of total emissions and the conversion of related concentrations. Data acquisition, processing and communication subsystem: composed of a data acquisition device and a computer system, real-time acquisition of various parameters, generation of dry basis, wet basis and converted concentrations corresponding to each concentration value, generation of daily, monthly and annual cumulative emissions, completion of compensation for lost data, and real-time transmission of reports to the competent department.

[0036] Embodiment 1

[0037] refer to Figure 1 The optimized operation system of the flue gas desulfurization device under the flexible peak load condition of the unit of the present invention comprises a flue gas pipeline 1 from the induced draft fan of unit A, a flue gas pipeline 2 from the induced draft fan of unit B, a desulfurization absorption tower 3 of unit A, a desulfurization absorption tower 4 of unit B, a first damper door 5, a second damper door 6, a third damper door 7, a first flue gas online monitoring system 8, a second flue gas online monitoring system 9, a third flue gas online monitoring system 10 and a fourth flue gas online monitoring system 11;

[0038] 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 through the first baffle door 5, and the flue gas outlet of the desulfurization absorption tower 3 of unit A is connected to the inlet of the chimney through the first smoke 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 through the second baffle door 6, and the flue gas outlet of the desulfurization absorption tower 4 of unit B is connected to the inlet of the chimney through the second smoke exhaust duct.

[0039] 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 communication duct, and a third baffle door 7 is provided on the communication duct.

[0040] The A unit induced draft fan smoke duct 1 is provided with a first smoke online monitoring system 8, and the B unit induced draft fan smoke duct 2 is provided with a second smoke online monitoring system 9; the first smoke exhaust duct is provided with a third smoke online monitoring system 10, and the second smoke exhaust duct is provided with a fourth smoke online monitoring system 11.

[0041] In this embodiment, a controller is also included, and the input end 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 end of the controller is connected to the first baffle door 5, the second baffle door 6 and the third baffle door 7.

[0042] It should be noted that the present invention sets a connecting flue in the inlet flue of the desulfurization absorption tower corresponding to the two existing units (the units have the same capacity), and baffle doors are set on the connecting flue and the inlet flue of the absorption tower. When the sum of the load rates of the two units exceeds the 100% load condition of a single unit, the third baffle door 7 is closed and the unit is operated in a normal unit system. When the sum of the load rates of the two units is lower than the 100% load condition of a single unit, the third baffle door is opened, and the first baffle door 5 or the second baffle door 6 is closed at the same time, so that one of the absorption towers is in a standby state. The present invention utilizes the existing desulfurization system configuration, and the modification amount is small. It can effectively avoid the reduction of gas-liquid mass transfer reaction efficiency caused by too low flue gas flow rate in the desulfurization tower when the unit load rate is low, and the performance of the demister is reduced, thereby ensuring the operating performance of the desulfurization system under medium and low load conditions and reducing the overall operating energy consumption.

[0043] Embodiment 2

[0044] The method for optimizing the operation of a flue gas desulfurization device under the flexible peak load regulation condition of the unit according to the present invention comprises the following steps:

[0045] Get the load factor of unit A;

[0046] Get the load factor of unit B;

[0047] When the sum of the load factor of unit A and the load factor of unit B is greater than or equal to 100%, the first damper door 5 is controlled to open, the second damper door 6 is controlled to open, and the third damper door 7 is controlled to close;

[0048] When the sum of the load factor of unit A and the load factor of unit B is less than 100%, the third damper door 7 is controlled to be opened, the first damper door 5 is controlled to be closed, or the second damper door 6 is controlled to be closed.

[0049] Embodiment 3

[0050] The controller of the present invention comprises:

[0051] The first acquisition module is used to obtain the load rate of unit A;

[0052] The second acquisition module is used to obtain the load factor of unit B;

[0053] The control module is used to control the first baffle door 5 to open, the second baffle door 6 to open, and the third baffle door 7 to close when the sum of the load rate of unit A and the load rate of unit B is greater than or equal to 100%; when the sum of the load rate of unit A and the load rate of unit B is less than 100%, control the third baffle door 7 to open, control the first baffle door 5 to close, or control the second baffle door 6 to close.

[0054] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0055] Embodiment 4

[0056] 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, the steps of the method for optimizing the operation of the flue gas desulfurization device under the flexible peak load condition of the unit are implemented, for example, including: obtaining the load rate of unit A; obtaining the load rate of unit B; when the sum of the load rate of unit A and the load rate of unit B is greater than or equal to 100%, the first damper door 5 is controlled to be opened, the second damper door 6 is controlled to be opened, and the third damper door 7 is controlled to be closed; when the sum of the load rate of unit A and the load rate of unit B is less than 100%, the third damper door 7 is controlled to be opened, the first damper door 5 is controlled to be closed, or the second damper door 6 is controlled to be closed. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs, specifically, the programs may include program codes, and the program codes include computer operation instructions. The memory may include internal memory and non-volatile memory, and provide instructions and data to the processor.

[0057] Embodiment 5

[0058] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for optimizing the operation of a flue gas desulfurization device under the flexible peak-shaving condition of the unit are implemented, for example, including: obtaining the load rate of unit A; obtaining the load rate of unit B; when the sum of the load rate of unit A and the load rate of unit B is greater than or equal to 100%, the first damper door 5 is controlled to be opened, the second damper door 6 is controlled to be opened, and the third damper door 7 is controlled to be closed; when the sum of the load rate of unit A and the load rate of unit B is less than 100%, the third damper door 7 is controlled to be opened, the first damper door 5 is controlled to be closed, or the second damper door 6 is controlled to be closed. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0059] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0063] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0064] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A flue gas desulfurization device optimization operation system under flexible peak load conditions, characterized in that: It comprises a flue gas duct (1) from the induced draft fan of unit A, a first damper door (5), a desulfurization absorption tower (3) from unit A, a flue gas duct (2) from the induced draft fan of unit B, a second damper door (6) and a desulfurization absorption tower (4) from unit B; 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 a first damper door (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 communication 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 a second damper door (6), and a third damper door (7) is provided on the communication duct.

2. The flue gas desulfurization device optimization operation system under the flexible peak load condition of the unit according to claim 1 is characterized in that: It also includes a chimney, and the flue gas outlet of the desulfurization absorption tower (3) of unit A is connected to the inlet of the chimney through a first flue gas exhaust pipe.

3. The flue gas desulfurization device optimization operation system under the flexible peak load condition of the unit according to claim 1 is 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 flue gas exhaust duct.

4. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 1 is characterized in that: The flue gas duct (1) from the induced draft fan of unit A is provided with a first flue gas online monitoring system (8).

5. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 1 is characterized in that: A second flue gas online monitoring system (9) is provided on the flue gas duct (2) of the induced draft fan of unit B.

6. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 2 is characterized in that: A third smoke online monitoring system (10) is arranged on the first smoke exhaust duct.

7. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 3 is characterized in that: A fourth smoke online monitoring system (11) is arranged on the second smoke exhaust duct.

8. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 1 is characterized in that: It also includes a controller, the output end 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 load conditions of a unit, characterized in that: The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 1 comprises: Get the load factor of unit A; Get the load factor of unit B; When the sum of the load factor of unit A and the load factor of unit B is greater than or equal to 100%, the first damper door (5) is controlled to open, the second damper door (6) is controlled to open, and the third damper door (7) is controlled to close; When the sum of the load factor of unit A and the load factor of unit B is less than 100%, the third damper door (7) is controlled to open, the first damper door (5) is controlled to close, or the second damper door (6) is controlled to close.

10. The flue gas desulfurization device optimization operation system under the unit flexible peak load condition according to claim 9, characterized in that: It also includes a chimney, wherein the flue gas outlet of the desulfurization absorption tower (3) of unit A is connected to the inlet of the chimney via a first flue gas 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 flue gas exhaust duct.

Images