Online monitoring system for chloride ions in desulfurization slurry of power plant

Abstract

The invention discloses an on-line monitoring system for chloride ions in desulfurization slurry of a power plant. The on-line monitoring system comprises a slurry input pipeline, a cleaning water input pipeline, a pretreatment settling tank, a measuring flow cell inlet valve, a chloride ion measuring flow cell, a chloride ion selective electrode and a chloride ion measuring instrument, an outlet of the slurry input pipeline and an outlet of the cleaning water input pipeline are combined through a pipeline and then communicated with an inlet in the side face of the top of the pretreatment settling tank, and an outlet in the side face of the pretreatment settling tank is communicated with an inlet of the chloride ion measurement flow cell through a measurement flow cell inlet valve. The chloride ion selective electrode is inserted into the chloride ion measurement flow cell, the chloride ion selective electrode is connected with the chloride ion measurement instrument, and the system can realize on-line monitoring of chloride ions in desulfurization slurry.

Description

Technical Field

[0001] The invention belongs to the field of water quality monitoring of power generation technology, and relates to an online monitoring system for chloride ions in desulfurization slurry of a power plant. Background Art

[0002] In recent years, as my country pays more and more attention to environmental protection, flue gas desulfurization and zero wastewater discharge have become the focus of pollutant emissions of major coal-fired power generation companies. Chloride ion is a key indicator in the monitoring of desulfurization slurry and desulfurization wastewater. Chloride ion is extremely corrosive. Excessive chloride ion will not only cause serious corrosion damage to desulfurization equipment, but also affect the CaCO in the absorption tower. 3 The decomposition rate of chlorine ions changes the pH value of the slurry, thereby affecting the chemical reaction in the absorption tower and increasing the operating cost. Rapid and accurate detection of the chloride ion content in the desulfurization slurry is of great significance for the corrosion protection of desulfurization equipment, optimization and adjustment of operation process, wastewater discharge and water conservation.

[0003] The chloride ions in the desulfurization slurry of power plants mainly come from the coal-burning process. The chlorine element contained in the coal enters the desulfurization device with the flue gas after combustion. Especially when the limestone-gypsum desulfurization treatment is used, the chloride ions in the flue gas will be absorbed into the desulfurization slurry. In addition, the recycling of water in the desulfurization device will also gradually enrich the chloride ions in the absorption tower slurry. Specifically, the overflow of the gypsum cyclone (return to the absorption tower), the underflow of the wastewater cyclone (return to the absorption tower), and the ditch and other incoming water (such as cooling water for pumps and fans, machine seal water, pipeline flushing water, etc.) may contain chloride ions. These water sources are returned to the absorption tower system through various pit recovery pumps, causing the chloride ion concentration to circulate and accumulate in the system.

[0004] At present, the chloride ion content in the desulfurization slurry is mainly measured by manual analysis method with regular sampling by laboratory personnel every day. The manual analysis method is cumbersome to operate, greatly increasing the workload of the staff, and the accuracy of the measurement is limited by the staff's analysis level and is difficult to guarantee. In addition, the manual sampling and analysis method has a long measurement cycle, which is generally once or twice a week. It is impossible to quickly and accurately monitor the chloride ion content of the desulfurization slurry, resulting in a monitoring blind spot and affecting the optimized operation of the desulfurization system. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and provide an online monitoring system for chloride ions in desulfurization slurry of a power plant, which can realize online monitoring of chloride ions in desulfurization slurry.

[0006] To achieve the above object, the present invention discloses an online monitoring system for chloride ions in desulfurization slurry of a power plant, comprising a slurry input pipeline, a cleaning water input pipeline, a pretreatment sedimentation tank, an inlet valve of a measuring circulation pool, a chloride ion measuring circulation pool, a chloride ion selective electrode and a chloride ion measuring instrument;

[0007] The outlet of the slurry input pipeline and the outlet of the cleaning water input pipeline are connected with the inlet on the top side of the pretreatment sedimentation tank through a pipeline. The outlet on the side of the pretreatment sedimentation tank is connected with the inlet of the chloride ion measurement circulation pool through the measuring circulation pool inlet valve. The chloride ion selective electrode is inserted into the chloride ion measurement circulation pool, and the chloride ion selective electrode is connected to the chloride ion measuring instrument.

[0008] The further improvement of the on-line monitoring system for chloride ions in desulfurization slurry of a power plant according to the present invention is:

[0009] Furthermore, a sewage discharge valve at the bottom of the pretreatment sedimentation tank is provided at the sewage discharge port at the bottom of the pretreatment sedimentation tank.

[0010] Furthermore, an overflow port is provided on the top side of the pretreatment sedimentation tank.

[0011] Furthermore, a bottom sewage valve of the chloride ion measurement circulation pool is provided at the bottom sewage outlet of the circulation pool.

[0012] Furthermore, an overflow port is provided on the side of the chloride ion measurement flow cell.

[0013] Furthermore, a slurry inlet valve is provided on the slurry input pipeline.

[0014] Furthermore, a cleaning water inlet valve is provided on the cleaning water input pipeline.

[0015] Furthermore, it also includes a controller, which is connected to a chloride ion measuring instrument.

[0016] Furthermore, the chloride ion content was measured using an ion selective electrode method.

[0017] The power plant desulfurization slurry chloride ion online monitoring system of the present invention comprises a slurry input pipeline, a cleaning water input pipeline, a pretreatment sedimentation tank, a measuring flow cell inlet valve, a chloride ion measuring flow cell, a chloride ion selective electrode and a chloride ion measuring instrument;

[0018] The outlet of the slurry input pipeline and the outlet of the cleaning water input pipeline are connected to the inlet on the top side of the pretreatment sedimentation tank through a pipeline, and the outlet on the side of the pretreatment sedimentation tank is connected to the inlet of the chloride ion measurement circulation pool through the measurement circulation pool inlet valve, and the chloride ion selective electrode is inserted into the chloride ion measurement circulation pool, and the chloride ion selective electrode is connected to the chloride ion measuring instrument;

[0019] Also included is a controller, which is connected to a chloride ion measuring instrument;

[0020] The chloride ion content was measured using an ion selective electrode method.

[0021] The present invention has the following beneficial effects:

[0022] During the specific operation of the power plant desulfurization slurry chloride online monitoring system described in the present invention, the outlet on the side of the pretreatment sedimentation tank is connected to the inlet of the chloride ion measurement circulation pool through the inlet valve of the measurement circulation pool. The pretreatment sedimentation tank is used to effectively remove large particulate matter such as suspended matter in the desulfurization slurry, reduce the impact of the desulfurization slurry on instrument scouring, improve the instrument measurement accuracy, extend the instrument service life, and then use the chloride ion selective electrode to perform online monitoring of the desulfurization slurry chloride ion without manual sampling for testing, thereby improving the accuracy and timeliness of chloride ion measurement and greatly reducing the workload of laboratory personnel. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Among them, 1 is the slurry inlet valve, 2 is the cleaning water inlet valve, 3 is the pretreatment sedimentation tank, 4 is the bottom sewage valve of the sedimentation tank, 5 is the inlet valve of the measuring circulation pool, 6 is the chloride ion measuring circulation pool, 7 is the bottom sewage valve of the circulation pool, 8 is the chloride ion selective electrode, 9 is the chloride ion measuring instrument, and 10 is the controller. 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] Embodiment 1

[0034] refer to Figure 1 The power plant desulfurization slurry chloride ion online monitoring system of the present invention comprises a slurry input pipeline, a cleaning water input pipeline, a pretreatment sedimentation tank 3, a measuring circulation pool inlet valve 5, a chloride ion measuring circulation pool 6, a chloride ion selective electrode 8 and a chloride ion measuring instrument 9; the outlet of the slurry input pipeline and the outlet of the cleaning water input pipeline are connected with the inlet on the top side of the pretreatment sedimentation tank 3 through a pipeline, the outlet on the side of the pretreatment sedimentation tank 3 is connected with the inlet of the chloride ion measuring circulation pool 6 through the measuring circulation pool inlet valve 5, the chloride ion selective electrode 8 is inserted into the chloride ion measuring circulation pool 6, and the chloride ion selective electrode 8 is connected to the chloride ion measuring instrument 9; it also includes a controller 10, and the controller 10 is connected to the chloride ion measuring instrument 9; the chloride ion content is measured by an ion selective electrode method.

[0035] Embodiment 2

[0036] refer to Figure 1 The power plant desulfurization slurry chloride ion online monitoring system of the present invention comprises a slurry input pipeline, a cleaning water input pipeline, a slurry inlet valve 1, a cleaning water inlet valve 2, a pretreatment sedimentation tank 3, a sedimentation tank bottom sewage valve 4, a measurement circulation pool inlet valve 5, a chloride ion measurement circulation pool 6, a circulation pool bottom sewage valve 7, a chloride ion selective electrode 8, a chloride ion measuring instrument 9 and a controller 10;

[0037] The outlet of the slurry input pipe and the outlet of the cleaning water input pipe are connected to the inlet on the top side of the pretreatment sedimentation tank 3 through a pipe. A sedimentation tank bottom drain valve 4 is provided at the drain outlet at the bottom of the pretreatment sedimentation tank 3; an overflow port is provided on the top side of the pretreatment sedimentation tank 3.

[0038] As an embodiment of the present invention, the outlet on the side of the pretreatment sedimentation tank 3 is connected to the inlet of the chloride ion measuring circulation pool 6 through the measuring circulation pool inlet valve 5, and a circulation pool bottom discharge valve 7 is provided at the bottom discharge outlet of the chloride ion measuring circulation pool 6; an overflow port is provided on the side of the chloride ion measuring circulation pool 6.

[0039] As an embodiment of the present invention, the chloride ion selective electrode 8 is inserted into the chloride ion measurement flow cell 6 , and the chloride ion selective electrode 8 is connected to a chloride ion measuring instrument 9 .

[0040] As an embodiment of the present invention, a slurry inlet valve 1 is provided on the slurry input pipeline.

[0041] As an embodiment of the present invention, a cleaning water inlet valve 2 is provided on the cleaning water input pipeline.

[0042] As an embodiment of the present invention, it also includes a controller 10, which is connected to the slurry inlet valve 1, the chloride ion measuring instrument 9, the cleaning water inlet valve 2, the measuring circulation pool inlet valve 5, the circulation pool bottom drain valve 7 and the sedimentation tank bottom drain valve 4.

[0043] Embodiment 3

[0044] The present embodiment discloses an online monitoring method for chloride ions in desulfurization slurry of a power plant. The online monitoring method for chloride ions in desulfurization slurry of a power plant is implemented based on the online monitoring system for chloride ions in desulfurization slurry of a power plant. The online monitoring system for chloride ions in desulfurization slurry of a power plant comprises a slurry input pipeline, a cleaning water input pipeline, a slurry inlet valve 1, a cleaning water inlet valve 2, a pretreatment sedimentation tank 3, a bottom sewage valve 4 of the sedimentation tank, an inlet valve 5 of a measuring circulation pool, a chloride ion measuring circulation pool 6, a bottom sewage valve 7 of the circulation pool, a chloride ion selective electrode 8, a chloride ion measuring instrument 9 and a controller 10. Specifically, the online monitoring method for chloride ions in desulfurization slurry of a power plant comprises the following steps:

[0045] When the water sample is measured normally, the slurry inlet valve 1 is opened, the cleaning water inlet valve 2 is closed, the sewage valve 4 at the bottom of the sedimentation tank is closed, and the measuring circulation pool inlet valve 5 is closed. The desulfurized slurry enters the pretreatment sedimentation tank 3 through the slurry inlet valve 1, and the excess desulfurized slurry is discharged through the overflow port on the pretreatment sedimentation tank 3. After 5 minutes, the slurry inlet valve 1 is closed, and the suspended matter in the desulfurized slurry is allowed to settle in the pretreatment sedimentation tank 3. The settling time is preset to 30 minutes. After 30 minutes, the measuring circulation pool inlet valve 5 is opened, the sewage valve 7 at the bottom of the circulation pool is closed, and the upper clear liquid in the pretreatment sedimentation tank 3 flows to the chloride ion measurement circulation pool 6 by gravity. The excess clear liquid is discharged through the overflow port on the chloride ion measurement circulation pool 6. The chloride ion content of the desulfurized slurry in the chloride ion measurement circulation pool 6 is measured by the chloride ion selective electrode 8, and the current chloride ion measurement value is displayed by the chloride ion measuring instrument 9. After the measurement is completed, the sewage valve 4 at the bottom of the settling tank is opened, the sewage valve 7 at the bottom of the circulation pool is opened, and the cleaning water inlet valve 2 is opened to discharge the desulfurized slurry in the pretreatment settling tank 3 and the chloride ion measurement circulation pool 6, and clean it. The cleaning time can be preset to 5 minutes. After the cleaning is completed, the cleaning water inlet valve 2 is closed, the sewage valve 4 at the bottom of the settling tank is closed, the inlet valve 5 of the measurement circulation pool is closed, the sewage valve 7 at the bottom of the circulation pool is closed, and the slurry inlet valve 1 is opened, and the measurement process is repeated.

[0046] It should be noted that all valves in the present invention are electric valves, and their action instructions are executed by the program built into the controller 10; the desulfurization slurry injection time, sedimentation time, and cleaning time can all be set by the controller 10 according to the on-site conditions.

[0047] The present invention has the following characteristics:

[0048] The present invention realizes the online monitoring of chloride ions in desulfurization slurry without manual sampling and testing, thus improving the accuracy and timeliness of chloride ion measurement and greatly reducing the workload of test personnel.

[0049] The present invention is provided with a desulfurization slurry pretreatment device, which can effectively remove large particle materials such as suspended matter in the desulfurization slurry, reduce the impact of the desulfurization slurry on instrument scouring, improve the measurement accuracy of the instrument, and extend the service life of the instrument.

[0050] The present invention adopts an ion selective electrode method to measure the chloride ion content, thereby reducing the use of chemical drugs.

[0051] Embodiment 4

[0052] 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 online monitoring of chloride ions in desulfurized slurry in a power plant are implemented. 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, which may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure 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 program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0053] Embodiment 5

[0054] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the online monitoring method for chloride ions in desulfurization slurry of a power plant are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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. An online monitoring system for chloride ions in desulfurization slurry of a power plant, characterized in that: It comprises a slurry input pipeline, a cleaning water input pipeline, a pretreatment sedimentation tank (3), a measuring circulation pool inlet valve (5), a chloride ion measuring circulation pool (6), a chloride ion selective electrode (8) and a chloride ion measuring instrument (9); The outlet of the slurry input pipeline and the outlet of the cleaning water input pipeline are connected to the inlet on the top side of the pretreatment sedimentation tank (3) through a pipeline, and the outlet on the side of the pretreatment sedimentation tank (3) is connected to the inlet of the chloride ion measurement circulation pool (6) through the measurement circulation pool inlet valve (5), and the chloride ion selective electrode (8) is inserted into the chloride ion measurement circulation pool (6), and the chloride ion selective electrode (8) is connected to the chloride ion measuring instrument (9).

2. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1 is characterized in that: A sewage discharge valve (4) at the bottom of the pretreatment sedimentation tank (3) is provided at the sewage discharge port at the bottom of the pretreatment sedimentation tank (3).

3. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1 is characterized in that: An overflow port is arranged on the top side of the pretreatment sedimentation tank (3).

4. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1 is characterized in that: A bottom sewage discharge valve (7) of the circulation pool is arranged at the bottom sewage discharge port of the chloride ion measurement circulation pool (6).

5. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1, characterized in that: An overflow port is arranged on the side of the chloride ion measurement flow cell (6).

6. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1, characterized in that: The slurry input pipeline is provided with a slurry inlet valve (1).

7. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1 is characterized in that: The cleaning water input pipeline is provided with a cleaning water inlet valve (2).

8. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1, characterized in that: It also comprises a controller (10), wherein the controller (10) is connected to a chloride ion measuring instrument (9).

9. The power plant desulfurization slurry chloride ion online monitoring system according to claim 1, characterized in that: The chloride ion content was measured using an ion selective electrode method.

10. An online monitoring system for chloride ions in desulfurization slurry of a power plant, characterized in that: It comprises a slurry input pipeline, a cleaning water input pipeline, a pretreatment sedimentation tank (3), a measuring circulation pool inlet valve (5), a chloride ion measuring circulation pool (6), a chloride ion selective electrode (8) and a chloride ion measuring instrument (9); The outlet of the slurry input pipeline and the outlet of the cleaning water input pipeline are connected to the inlet on the top side of the pretreatment sedimentation tank (3) through a pipeline, and the outlet on the side of the pretreatment sedimentation tank (3) is connected to the inlet of the chloride ion measurement circulation pool (6) through the measurement circulation pool inlet valve (5), and the chloride ion selective electrode (8) is inserted into the chloride ion measurement circulation pool (6), and the chloride ion selective electrode (8) is connected to the chloride ion measuring instrument (9); It also includes a controller (10), wherein the controller (10) is connected to a chloride ion measuring instrument (9); The chloride ion content was measured using an ion selective electrode method.

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