Optimized operation system and method for serial tower flue gas desulfurization device

Abstract

The invention discloses an optimized operation system and method for a serial-tower flue gas desulfurization device, and the system comprises an induced draft fan flue gas pipeline, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a first-stage desulfurization absorption tower, a second-stage desulfurization absorption tower, and a chimney. The induced draft fan flue gas pipeline is communicated with the inlet of the first pipeline and the inlet of the second pipeline. An outlet of the second pipeline is communicated with an inlet of the first-stage desulfurization absorption tower, an outlet of the first-stage desulfurization absorption tower and an outlet of the first pipeline are combined through pipelines and then are divided into two paths, one path is communicated with an inlet of the second-stage desulfurization absorption tower through a third pipeline, and the second path is communicated with an inlet of the chimney through a fourth pipeline; according to the system and the method, the operation energy consumption of the desulfurization system under the medium-low load working condition or when low-sulfur coal is burnt can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of air pollution control and relates to an optimized operation system and method for a series-tower flue gas desulfurization device. Background Art

[0002] At present, domestic coal-fired power plants have basically completed the ultra-low emission transformation of environmental protection facilities. High-sulfur coal units generally use a series tower process, that is, a set of desulfurization system is equipped with two absorption towers, which are operated in series. With the rapid development of new energy such as wind and solar power, the load rate of coal-based power generation units has been declining year by year. At the same time, due to changes in coal sources, the actual sulfur content of some power plants is lower than the design value. How to reduce the energy consumption of the desulfurization system under medium and low load conditions or when burning low-sulfur coal 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 provide a system and method for optimizing the operation of a series-tower flue gas desulfurization device, which can reduce the operating energy consumption of the desulfurization system under medium and low load conditions or when burning low-sulfur coal.

[0004] To achieve the above object, the present invention discloses an optimized operation system of a series-tower flue gas desulfurization device, comprising a flue gas pipeline from an induced draft fan, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a primary desulfurization absorption tower, a secondary desulfurization absorption tower and a chimney:

[0005] The flue gas duct from the induced draft fan is connected with the inlet of the first duct and the inlet of the second duct, the outlet of the second duct is connected with the inlet of the primary desulfurization absorption tower, the outlet of the primary desulfurization absorption tower and the outlet of the first duct are connected through the duct and divided into two paths, one of which is connected with the inlet of the secondary desulfurization absorption tower through the third duct, the second is connected with the inlet of the chimney through the fourth duct, and the outlet of the secondary desulfurization absorption tower is connected with the inlet of the chimney.

[0006] The further improvement of the optimized operation system of the series-tower flue gas desulfurization device of the present invention is:

[0007] Furthermore, a first baffle door is provided on the first pipeline.

[0008] Furthermore, a second baffle door is provided on the third pipeline.

[0009] Furthermore, a third baffle door is provided on the fourth pipeline.

[0010] Furthermore, a fourth baffle door is provided at the outlet of the secondary desulfurization absorption tower.

[0011] Furthermore, a first flue gas online monitoring system is provided on the flue gas duct from the induced draft fan.

[0012] Furthermore, a second flue gas online monitoring system is provided at the entrance of the chimney.

[0013] Furthermore, it also includes a controller, wherein the input end of the controller is connected to the output end of the first flue gas online monitoring system and the output end of the second flue gas online monitoring system, and the output end of the controller is connected to the control end of the first baffle door, the control end of the second baffle door, the control end of the third baffle door and the control end of the fourth baffle door.

[0014] The invention discloses a method for optimizing the operation of a series-tower flue gas desulfurization device, comprising:

[0015] Get the load factor of the unit;

[0016] The sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system;

[0017] When the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system is lower than the preset concentration, the first damper door, the second damper door and the fourth damper door are controlled to be closed, and the third damper door is opened, or the first damper door, the second damper door and the fourth damper door are controlled to be opened, and the third damper door is controlled to be closed.

[0018] The further improvement of the optimized operation method of the series-tower flue gas desulfurization device of the present invention is:

[0019] Furthermore, it also includes a controller, wherein the input end of the controller is connected to the output end of the first flue gas online monitoring system and the output end of the second flue gas online monitoring system, and the output end of the controller is connected to the control end of the first baffle door, the control end of the second baffle door, the control end of the third baffle door and the control end of the fourth baffle door.

[0020] The present invention has the following beneficial effects:

[0021] In the specific operation of the system and method for optimizing the operation of the series-tower flue gas desulfurization device described in the present invention, when the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system is lower than the preset concentration, the first-level desulfurization absorption tower or the second-level desulfurization absorption tower is put into use, thereby effectively reducing the operating energy consumption of the desulfurization system under medium and low load conditions or when burning low-sulfur coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a structural diagram of the present invention.

[0024] Among them, 1 is the flue gas duct from the induced draft fan, 2 is the primary desulfurization absorption tower, 3 is the secondary desulfurization absorption tower, 4 is the first flue gas online monitoring system, 5 is the second flue gas online monitoring system, 6 is the first baffle door, 7 is the second baffle door, 8 is the third baffle door, and 9 is the fourth baffle door. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Embodiment 1

[0035] refer to Figure 1 The optimized operation system of the series-tower flue gas desulfurization device of the present invention comprises a flue gas pipeline 1 from an induced draft fan, a primary desulfurization absorption tower 2, a secondary desulfurization absorption tower 3, a first flue gas online monitoring system 4, a second flue gas online monitoring system 5, a first damper door 6, a second damper door 7, a third damper door 8 and a fourth damper door 9;

[0036] The flue gas duct 1 from the induced draft fan is connected with the inlet of the first duct and the inlet of the second duct, the outlet of the second duct is connected with the inlet of the primary desulfurization absorption tower 2, the outlet of the primary desulfurization absorption tower 2 and the outlet of the first duct are connected with the outlet of the first duct and divided into two paths after being connected through the duct, one of which is connected with the inlet of the secondary desulfurization absorption tower 3 through the third duct, the second is connected with the inlet of the chimney through the fourth duct, and the outlet of the secondary desulfurization absorption tower 3 is connected with the inlet of the chimney.

[0037] As an embodiment of the present invention, a first baffle door 6 is provided on the first pipeline, a second baffle door 7 is provided on the third pipeline, a third baffle door 8 is provided on the fourth pipeline, and a fourth baffle door 9 is provided at the outlet of the secondary desulfurization absorption tower 3.

[0038] As an embodiment of the present invention, a first flue gas online monitoring system 4 is provided on the flue gas duct 1 from the induced draft fan, and a second flue gas online monitoring system 5 is provided at the entrance of the chimney.

[0039] As an implementation mode of the present invention, this embodiment also includes a controller, wherein the input end of the controller is connected to the output end of the first flue gas online monitoring system 4 and the output end of the second flue gas online monitoring system 5, and the output end of the controller is connected to the control end of the first baffle door 6, the control end of the second baffle door 7, the control end of the third baffle door 8 and the control end of the fourth baffle door 9, and the first baffle door 6, the second baffle door 7, the third baffle door 8 and the fourth baffle door 9 are controlled by the controller.

[0040] The characteristics of the present invention are: a first connecting pipe and a fourth connecting pipe are provided, the first connecting pipe is used as a bypass flue of the primary desulfurization absorption tower 2, and the fourth connecting pipe is used as a bypass flue of the secondary desulfurization absorption tower 3, and a plurality of damper doors are provided at the same time. When the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than the preset concentration, by adjusting the opening and closing of each damper door, one of the primary desulfurization absorption tower 2 and the secondary desulfurization absorption tower 3 is selectively put into operation, so that the other absorption tower is in a standby state. This method utilizes the existing desulfurization system configuration, with a small amount of modification, and can effectively avoid the problem of high energy consumption of dual-tower operation under medium and low load conditions or when burning low-sulfur coal.

[0041] Embodiment 2

[0042] The method for optimizing the operation of the series-tower flue gas desulfurization device in this embodiment comprises the following steps:

[0043] Get the load factor of the unit;

[0044] The sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4;

[0045] When the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than the preset concentration, the first baffle door 6, the second baffle door 7 and the fourth baffle door 9 are controlled to be closed, and the third baffle door 8 is opened, or the first baffle door 6, the second baffle door 7 and the fourth baffle door 9 are controlled to be opened, and the third baffle door 8 is controlled to be closed.

[0046] Embodiment 3

[0047] This embodiment discloses a controller, including:

[0048] The first acquisition module is used to obtain the load factor of the unit;

[0049] A second acquisition module is used to measure the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4;

[0050] The control module is used to control the first baffle door 6, the second baffle door 7 and the fourth baffle door 9 to be closed, and the third baffle door 8 to be opened, or to control the first baffle door 6, the second baffle door 7 and the fourth baffle door 9 to be opened, and the third baffle door 8 to be closed when the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than the preset concentration.

[0051] 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.

[0052] Embodiment 4

[0053] 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 of the series tower are implemented, for example, including: obtaining the load rate of the unit; the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4; when the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than the preset concentration, the first damper door 6, the second damper door 7 and the fourth damper door 9 are controlled to be closed, and the third damper door 8 is opened, or the first damper door 6, the second damper door 7 and the fourth damper door 9 are controlled to be opened, and the third damper door 8 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.

[0054] Embodiment 5

[0055] 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 the flue gas desulfurization device of the series tower are implemented, for example, including: obtaining the load rate of the unit; the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4; when the load rate of the unit is lower than the preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than the preset concentration, the first damper door 6, the second damper door 7 and the fourth damper door 9 are controlled to be closed, and the third damper door 8 is opened, or the first damper door 6, the second damper door 7 and the fourth damper door 9 are controlled to be opened, and the third damper door 8 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] 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.

[0061] 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.

[0062] 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 series of tower flue gas desulfurization device optimization operation system, characterized in that: It includes a flue gas pipeline (1) from an induced draft fan, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a primary desulfurization absorption tower (2), a secondary desulfurization absorption tower (3) and a chimney: The flue gas pipeline (1) from the induced draft fan is connected to the inlet of the first pipeline and the inlet of the second pipeline, the outlet of the second pipeline is connected to the inlet of the primary desulfurization absorption tower (2), the outlet of the primary desulfurization absorption tower (2) and the outlet of the first pipeline are connected through a pipeline and then divided into two paths, one of which is connected to the inlet of the secondary desulfurization absorption tower (3) through a third pipeline, and the second path is connected to the inlet of the chimney through a fourth pipeline, and the outlet of the secondary desulfurization absorption tower (3) is connected to the inlet of the chimney.

2. The optimized operation system of the series-tower flue gas desulfurization device according to claim 1 is characterized in that: A first baffle door (6) is provided on the first pipeline.

3. The optimized operation system of the series-tower flue gas desulfurization device according to claim 2 is characterized in that: A second baffle door (7) is arranged on the third pipeline.

4. The optimized operation system of the series-tower flue gas desulfurization device according to claim 3 is characterized in that: A third baffle door (8) is arranged on the fourth pipeline.

5. The optimized operation system of the series-tower flue gas desulfurization device according to claim 4 is characterized in that: A fourth baffle door (9) is provided at the outlet of the secondary desulfurization absorption tower (3).

6. The optimized operation system of the series-tower flue gas desulfurization device according to claim 5 is characterized in that: The induced draft fan smoke duct (1) is provided with a first smoke online monitoring system (4).

7. The optimized operation system of the series-tower flue gas desulfurization device according to claim 6 is characterized in that: A second flue gas online monitoring system (5) is provided at the entrance of the chimney.

8. The optimized operation system of the series-tower flue gas desulfurization device according to claim 7 is characterized in that: The system further comprises a controller, wherein an input end of the controller is connected to an output end of the first online smoke monitoring system (4) and an output end of the second online smoke monitoring system (5), and an output end of the controller is connected to a control end of the first damper door (6), a control end of the second damper door (7), a control end of the third damper door (8) and a control end of the fourth damper door (9).

9. A method for optimizing the operation of a series-tower flue gas desulfurization device, characterized in that: The optimized operation system of the series-tower flue gas desulfurization device according to claim 7 comprises: Get the load factor of the unit; The sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system (4); When the load rate of the unit is lower than a preset load rate or the sulfur dioxide concentration of the flue gas measured by the first flue gas online monitoring system 4 is lower than a preset concentration, the first damper door (6), the second damper door (7) and the fourth damper door (9) are controlled to be closed, and the third damper door (8) is opened; or the first damper door (6), the second damper door (7) and the fourth damper door (9) are controlled to be opened, and the third damper door (8) is controlled to be closed.

10. The method for optimizing operation of a series-tower flue gas desulfurization device according to claim, characterized in that: The system further comprises a controller, wherein an input end of the controller is connected to an output end of the first online smoke monitoring system (4) and an output end of the second online smoke monitoring system (5), and an output end of the controller is connected to a control end of the first damper door (6), a control end of the second damper door (7), a control end of the third damper door (8) and a control end of the fourth damper door (9).

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