Wet desulphurization sulfite on-line detection device

Abstract

The utility model provides an on-line detection device for sulfite in wet desulphurization. A reaction unit comprises a reactor and an oxidation-reduction potential electrode, the titration unit comprises a liquid storage bottle, a conveying device and a driving device; the protection unit comprises a protection liquid storage bottle, a protection conveying device and a protection driving device; and the protective liquid storage bottle is connected to the reactor through the protective conveying device and the protective driving device. An iodine standard solution is used as a titrant, and accurate measurement of a redox potential electrode is combined, so that the concentration of sulfite ions in the desulfurization slurry can be accurately calculated, the dissolved oxygen value of a solution in a slurry buffer tank can be measured based on a dissolved oxygen analyzer, and the dissolved oxygen value and the sulfite concentration are mutually verified; and dual-mode feedback regulation and control of the oxidation system are realized. Continuous and automatic measurement of sulfite ions in the desulfurization slurry can be realized, and the detection efficiency and accuracy are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sulfite ion detection, in particular to a wet desulfurization sulfite detection device. Background Art

[0002] With the development of the coal-fired power industry and the continuous improvement of environmental protection requirements, wet desulfurization technology has become one of the main desulfurization methods in coal-fired power plants. Its desulfurization efficiency and stability have a significant impact on environmental emissions and economic benefits. During the wet desulfurization process, the concentration of sulfite ions in the desulfurization slurry is one of the important indicators reflecting the operating performance of the desulfurization system.

[0003] The existing sulfite detection method requires sampling in the desulfurization slurry and transporting it to the laboratory for detection and analysis. This method cannot achieve real-time detection of sulfite ion concentration and is difficult to meet the demand for real-time monitoring of the oxidation effect of the desulfurization system. Utility Model Content

[0004] The utility model provides a wet desulfurization sulfite detection device to realize continuous automatic measurement of sulfite ions in desulfurization slurry.

[0005] The device includes a slurry buffer tank, a reaction unit, a sampling unit, a titration unit, a control unit and a protection unit;

[0006] The slurry buffer tank is connected to the reactor through a sampling unit; the slurry buffer tank is equipped with a dissolved oxygen analyzer;

[0007] The reaction unit includes: a reactor, an oxidation-reduction potential electrode, and a stirrer;

[0008] The titration unit includes: a liquid storage bottle, a conveying device and a driving device;

[0009] The liquid storage bottle is filled with iodine standard solution, and the liquid storage bottle is connected to the reactor through a conveying device and a driving device;

[0010] The redox potential electrode is plugged into the interior of the reactor;

[0011] The control unit is connected to a dissolved oxygen analyzer to measure the dissolved oxygen value of the solution in the slurry buffer tank.

[0012] It should be further noted that the reactor is mounted with a fixed bracket, on which an electric stirrer is mounted. It should be further noted that the electric stirrer is provided with a stirring rod, the top end of which is connected to a drive motor; the bottom end of the stirring rod extends into the reactor and is positioned near the bottom;

[0013] A stirring blade is installed on the stirring rod extending into the interior of the reactor.

[0014] It should be further explained that a sprayer is provided inside the reactor;

[0015] The sprinkler is connected to the municipal water through a pipeline, and a first solenoid valve is provided on the pipeline.

[0016] It should be further explained that a drain pipe is provided at the bottom of the reactor, and a second solenoid valve is installed on the drain pipe.

[0017] It should be further explained that the sampling unit includes: a slurry hose and a peristaltic pump provided on the slurry hose;

[0018] The slurry buffer tank is connected to the reactor through a slurry hose.

[0019] It should be further explained that the reactor, the liquid storage bottle, the protective liquid storage bottle and the slurry buffer tank are respectively equipped with liquid level sensors.

[0020] It should be further explained that the control unit is respectively connected to the driving device, the first solenoid valve, the second solenoid valve, the liquid level sensor and the redox potential electrode, measures the redox potential value of the solution in the reactor through the redox potential electrode, and controls the operation of the driving device, the first solenoid valve, the second solenoid valve and the liquid level sensor.

[0021] It should be further explained that the titration unit includes: a plurality of liquid storage bottles, each of which is equipped with a conveying device and a driving device.

[0022] It can be seen from the above technical solutions that the present invention has the following advantages:

[0023] The wet desulfurization sulfite online detection device provided by the utility model realizes the continuous automatic measurement of sulfite ions in the desulfurization slurry, reduces manual intervention, improves the detection efficiency and accuracy of the redox potential electrode, and provides real-time data support for the control of the desulfurization process.

[0024] The utility model can optimize the desulfurization operation, improve the oxidation crystallization effect and reduce the energy consumption of the oxidation system by accurately controlling the sulfite ion concentration in the desulfurization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of an online sulfite detection device for wet desulfurization;

[0027] Figure 2 This is a schematic diagram of an embodiment of an online sulfite detection device for wet desulfurization. DETAILED DESCRIPTION

[0028] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0029] like Figure 1 As shown, the wet desulfurization sulfite online detection device provided by the present invention includes: a slurry buffer tank, a reaction unit, a sampling unit, a protection unit, a control unit and a titration unit.

[0030] Specifically, the reaction unit includes a reactor 1 and an oxidation-reduction potential electrode 5; the oxidation-reduction potential electrode 5 is plugged into the reactor 1. The slurry buffer tank 25 is connected to the reactor 1 via a sampling unit, providing desulfurization slurry to the reactor 1. The slurry buffer tank 25 is equipped with a dissolved oxygen analyzer 26. The control unit is connected to the dissolved oxygen analyzer to measure the dissolved oxygen value of the solution in the slurry buffer tank.

[0031] The sampling unit of this embodiment includes a slurry hose 17 and a peristaltic pump 6 disposed on the slurry hose 17. The slurry buffer tank 25 is connected to the reactor 1 via the slurry hose 17. The desulfurization slurry in the slurry buffer tank 25 is pumped into the reactor 1 via the peristaltic pump 6. The peristaltic pump has forward and reverse rotation functions.

[0032] Optionally, the reactor 1 is encapsulated in a shell and filled with nitrogen for anti-oxidation protection.

[0033] The titration unit of this embodiment includes: a liquid storage bottle, a conveying device and a driving device; the protection unit includes: a protection liquid storage bottle 15, a protection conveying device 23 and a protection driving device 11.

[0034] The liquid storage bottle is filled with iodine standard solution, and the liquid storage bottle is connected to the reactor 1 through a conveying device and a driving device.

[0035] Specifically, the delivery device can be a hose or a hard tube for delivering the iodine standard solution, and the driving device can be a syringe pump.

[0036] In some specific embodiments, a quantitative desulfurization slurry is pumped from a slurry buffer tank 25 into the reactor. A standard iodine (I2) solution and a standard sodium thiosulfate (Na2S2O4) solution are pumped into the reactor via a syringe pump from a reservoir of a titration unit to effect the titration process. An oxidation-reduction potential electrode 5 is plugged into the interior of the reactor 1. The oxidation-reduction potential electrode 5 can measure the oxidation-reduction potential of the solution within the reactor.

[0037] This embodiment also includes a control unit. The control unit is respectively connected to the drive device, the first solenoid valve, the second solenoid valve, the liquid level sensor, and the redox potential electrode. The redox potential value of the solution in the reactor is measured by the redox potential electrode. By capturing the sodium thiosulfate solution added during the potential jump, the concentration of sulfite ions in the slurry is accurately inverted, thereby achieving universal continuous automatic measurement of sulfite ions in the desulfurization slurry. The control unit can also control the operation of the drive device, the first solenoid valve, and the second solenoid valve according to the redox potential value to meet the measurement requirements. The control unit also obtains liquid level information by connecting to the liquid level sensor and issues a prompt message when the liquid level fails to meet the requirements.

[0038] The control unit of this embodiment is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The control unit can also represent various forms of mobile devices, such as personal digital processing and other similar computing devices.

[0039] like Figure 2 As shown, the titration unit in this embodiment includes: a plurality of liquid storage bottles, each of which is equipped with a conveying device and a driving device.

[0040] Among them, the first liquid storage bottle 12 is filled with a 0.05mol / L iodine standard solution and is connected to the reactor 1 through a first delivery device 18 and a first injection pump 8. The second liquid storage bottle 13 is filled with a 0.05mol / L sodium thiosulfate solution and is connected to the reactor 1 through a second delivery device 19 and a second injection pump 9; the third liquid storage bottle 14 is filled with a 0.1mol / L sodium thiosulfate solution and is connected to the reactor 1 through a third delivery device 20 and a third precision injection pump 10. When the sulfite concentration is too high, the third precision injection pump 10 is enabled to perform the titration operation, so that a larger range requirement can be met. Moreover, by using an iodine standard solution as a titrant and combining it with the precise measurement of the redox potential electrode, the concentration of sulfite ions in the desulfurization slurry can be accurately calculated, thereby improving the accuracy of the detection.

[0041] This embodiment uses iodine standard solution as a titrant, combined with the precise measurement of the redox potential electrode, to accurately calculate the concentration of sulfite ions in the desulfurization slurry. At the same time, it can also measure the dissolved oxygen value of the solution in the slurry buffer tank based on the dissolved oxygen analyzer, and verify it with the sulfite concentration, thereby realizing dual-mode feedback control of the oxidation system.

[0042] In this embodiment, the protection liquid storage bottle 15 is connected to the reactor 1 through the protection conveying device 23 and the protection driving device 11. The protection conveying device 23 can be a hose or a hard pipe. The protection driving device 11 is a syringe pump.

[0043] The reactor 1 of this embodiment is provided with a sprayer 3, which is connected to municipal water via a pipeline, and a first solenoid valve 21 is provided on the pipeline. The sprayer 3 can flush the interior of the reactor 1 by being connected to municipal water.

[0044] The bottom of the reactor 1 of this embodiment is provided with a drain pipe 24, and a second solenoid valve 7 is installed on the drain pipe 24. The drain pipe 24 can discharge cleaning water and waste water, etc.

[0045] In this embodiment, when flushing the reactor 1, the sampling unit, titration unit, drive device, and protection drive device 11 can be first closed. The first solenoid valve 21, the second solenoid valve 7, and the sprayer are opened to flush the reactor 1. After the flushing is completed, the first solenoid valve 21 and the second solenoid valve 7 are closed, and the protection drive device 11 is opened to quantitatively pump the solution in the protection liquid storage bottle 15 into the reactor 1 so that the highest point of the liquid level is higher than the detection probe of the redox potential electrode 5.

[0046] In some embodiments, the reactor 1 is equipped with a fixed bracket 2, which can be set near the upper end of the reactor 1. An electric stirrer is installed on the fixed bracket 2; the electric stirrer extends into the reactor 1 and is set near the bottom. The electric stirrer is provided with a stirring rod 4, the top of which is connected to a drive motor 42; the bottom of the stirring rod 4 extends into the reactor 1 and is set near the bottom; the stirring rod 4 extending into the interior of the reactor 1 is equipped with a stirring blade 41. The stirring blade 41 serves to stir the slurry inside the reactor 1. It can also prevent the sedimentation of slurry particles and provide power to increase the reaction rate.

[0047] In order to facilitate fixed use, the conveying device and the protective conveying device 23 are respectively installed on the fixed bracket 2.

[0048] For this embodiment, the control unit can measure the redox potential of the solution in the reactor through the redox potential electrode 5 to determine the titration end point and the amount of titration standard solution consumed, and invert the sulfite ion concentration in the desulfurization slurry to achieve continuous automatic measurement of sulfite ions in the desulfurization slurry.

[0049] According to an embodiment of the present application, the control unit can provide the operator with data information on sulfite ions and dissolved oxygen in the desulfurization slurry, so that the operator can adjust the oxidation fan based on the displayed sulfite concentration and dissolved oxygen value, combined with the collected flue gas parameters at the inlet and outlet of the desulfurization tower, the desulfurization circulating slurry parameters and the oxidation fan operating parameters. The operator can evaluate the operating status of the oxidation process.

[0050] In this embodiment, liquid level sensors are installed in the reactor 1, the liquid storage bottle, the protective liquid storage bottle 15, and the slurry buffer tank 25. The liquid level sensors can be connected to the control unit to obtain liquid level information of the reactor 1, the liquid storage bottle, the protective liquid storage bottle 15, and the slurry buffer tank 25. If the liquid level is low, the control unit can issue a prompt to the operator.

[0051] The control unit is also connected to a dissolved oxygen analyzer to measure the dissolved oxygen value of the solution in the slurry buffer tank and verify it with the sulfite concentration, thereby achieving dual-mode feedback control of the oxidation system. This dual-mode feedback control in this embodiment can simultaneously utilize both the redox potential and the dissolved oxygen concentration for feedback control, thereby achieving precise control of the desulfurization oxidation system.

[0052] For the wet desulfurization sulfite online detection device involved in the utility model, the sulfite ions in the desulfurization slurry in the reactor and the dissolved oxygen in the desulfurization slurry are quantitatively detected by potentiometric titration; the operator can be informed that if the sulfite value and the dissolved oxygen value are within the preset threshold range, the fan opening will not be controlled and will remain unchanged.

[0053] When the operator learns that the sulfite value is lower than the preset sulfite threshold and the dissolved oxygen value is higher than the preset dissolved oxygen threshold, the opening of the oxidation fan can be controlled to be reduced.

[0054] When the operator learns that the sulfite value is higher than the preset sulfite threshold and the dissolved oxygen value is lower than the preset dissolved oxygen threshold, the operator controls the fan opening to increase.

[0055] Furthermore, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, the following provides a specific implementation process of the wet desulfurization oxidation air adjustment diagnosis method, which specifically includes the following steps:

[0056] In some embodiments, the sulfite ion concentration in the desulfurized slurry is determined based on the residual iodine method. An excess of a standard iodine solution is added to the desulfurized slurry, causing it to react with the sulfite ions in the solution, oxidizing them to sulfate ions. A fixed amount of a standard sodium thiosulfate solution is then added to the slurry to reduce the remaining iodine. The consumption of the standard iodine solution is then used to invert the sulfite ion concentration in the desulfurized slurry.

[0057] Among them, the main ion reaction equations involved are:

[0058] I2+SO3 2- +H2O==SO4 2- +2H + +2I -

[0059] 2S2O3 2- +I2==S4O6 2- +2I -

[0060] According to the above formula, the concentration of sulfite ions can be obtained as follows:

[0061] C(SO3 2- )=[V(I2)C(I2)-0.5V(S2O3 2- )C(S2O3 2- )] / V(slurry)

[0062] Where, V represents the volume of desulfurized slurry, C(SO3 2- ) represents the molar concentration of sulfite ions in the desulfurization slurry.

[0063] The titration endpoint is determined by the change in the redox potential. Considering that the only strongly reducing substance in the desulfurization slurry is sulfite ions, the redox potential will rise rapidly when an excess of iodine standard solution is added.

[0064] In this embodiment, a sodium thiosulfate standard solution is added dropwise to read the redox potential electrode reading.

[0065] When the solution transitions from strong oxidizing to strong reducing, the redox potential will jump. By capturing the sodium thiosulfate solution added during the potential jump, the concentration of sulfite ions in the slurry can be accurately inverted, realizing universal continuous automatic measurement of sulfite ions in the desulfurization slurry.

[0066] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0068] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wet desulfurization sulfite online detection device, characterized in that: include: Slurry buffer tank, reaction unit, sampling unit, protection unit, control unit and titration unit; The reaction unit includes: a reactor, an oxidation-reduction potential electrode; The titration unit includes: a liquid storage bottle, a conveying device and a driving device; The protection unit includes: a protection liquid storage bottle, a protection conveying device and a protection driving device; the protection liquid storage bottle is connected to the reactor through the protection conveying device and the protection driving device; The slurry buffer tank is connected to the reactor through a sampling unit, and the slurry buffer tank is equipped with a dissolved oxygen analyzer; The liquid storage bottle is filled with iodine standard solution, and the liquid storage bottle is connected to the reactor through a conveying device and a driving device; The redox potential electrode is plugged into the interior of the reactor; The control unit is connected to a dissolved oxygen analyzer to measure the dissolved oxygen value of the solution in the slurry buffer tank.

2. The wet desulfurization sulfite online detection device according to claim 1, characterized in that: The reactor is provided with a fixed support, and the fixed support is provided with an electric stirrer.

3. The wet desulfurization sulfite online detection device according to claim 2, characterized in that: The electric stirrer is provided with a stirring rod, and the top end of the stirring rod is connected to a driving motor; The bottom end of the stirring rod extends into the reactor and is arranged near the bottom; A stirring blade is installed on the stirring rod extending into the interior of the reactor.

4. The wet desulfurization sulfite online detection device according to claim 1, characterized in that: A sprayer is provided inside the reactor; The sprinkler is connected to the municipal water through a pipeline, and a first solenoid valve is provided on the pipeline.

5. The wet desulfurization sulfite online detection device according to claim 1, characterized in that: A drain pipe is provided at the bottom of the reactor, and a second solenoid valve is installed on the drain pipe.

6. The wet desulfurization sulfite online detection device according to claim 5, characterized in that: The sampling unit includes: a slurry hose and a peristaltic pump arranged on the slurry hose; The slurry buffer tank is connected to the reactor through a slurry hose.

7. The wet desulfurization sulfite online detection device according to claim 1, characterized in that: The reactor, liquid storage bottle, protective liquid storage bottle and slurry buffer tank are respectively equipped with liquid level sensors.

8. The wet desulfurization sulfite online detection device according to claim 6, characterized in that: The control unit is respectively connected to the driving device, the first solenoid valve, the second solenoid valve, the liquid level sensor and the redox potential electrode, measures the redox potential value of the solution in the reactor through the redox potential electrode, and controls the operation of the driving device, the first solenoid valve, the second solenoid valve and the liquid level sensor.

9. The wet desulfurization sulfite online detection device according to claim 1, characterized in that: The titration unit comprises: a plurality of liquid storage bottles, each of which is matched with a conveying device and a driving device.

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