Iron ion monitoring device for water vapor system of thermal power plant

Abstract

The utility model discloses a kind of thermal power plant water vapor system iron ion monitoring devices, comprising: the water vapor system of connecting power plant is used to obtain and filter the sampling and pretreatment unit of water sample;With the sampling and pretreatment unit is connected, including curved flow channel formula reactor is used to make water sample and chromogenic reagent mixed in flow and complete chromogenic reaction automatic reaction unit;With the automatic reaction unit is connected for detecting the optical detection unit of absorbance value of solution after reaction;And for converting the control and data processing unit of absorbance value into iron ion concentration data.The utility model is mixed by adopting curved flow channel formula reactor, realizes mixing and stable reaction using fluid secondary flow effect, to solve the problem of uneven mixing, unstable reaction in prior art.

Description

Technical Field

[0001] This utility model belongs to the field of industrial water quality analysis technology, and in particular relates to an iron ion monitoring device for the water-steam system of a thermal power plant. Background Technology

[0002] In the monitoring of iron ions in the steam-water system of thermal power plants, existing online monitoring technologies typically employ mechanical stirring or static mixers to mix reagents with water samples. These mixing methods have significant drawbacks: mechanical stirring involves complex structures and carries the risk of dynamic seal failure; static mixers suffer from significant pressure loss and struggle to maintain mixing effectiveness across a wide flow rate range. These problems of insufficient mixing and unstable reactions directly lead to incomplete colorimetric reactions or fluctuating results, affecting the accuracy and reliability of the final detection data. Furthermore, current iron ion monitoring in thermal power plants primarily relies on manual sampling and analysis, which presents serious time lags and safety risks. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an iron ion monitoring device for the water-steam system of a thermal power plant. By adopting a curved flow channel reactor, the device utilizes the secondary flow effect of the fluid to achieve mixing and stable reaction, thereby solving the problems of uneven mixing and unstable reaction in the existing technology.

[0004] Technical solution: To achieve the above objectives, this utility model provides an iron ion monitoring device for a steam-water system in a thermal power plant, comprising:

[0005] The water and steam system connected to the power plant is used for sampling and pretreatment units to acquire and filter water samples;

[0006] Connected to the sampling and pretreatment unit, an automated reaction unit including a curved flow channel reactor is used to mix the water sample and the colorimetric reagent in the flow and complete the colorimetric reaction.

[0007] An optical detection unit is connected to the automatic reaction unit to detect the absorbance value of the solution after the reaction;

[0008] And a control and data processing unit for converting absorbance values ​​into iron ion concentration data.

[0009] Furthermore, the curved flow channel reactor is a spiral mixing reaction coil or a mixing reaction zigzag tube composed of multiple continuous curved sections.

[0010] Furthermore, the sampling and pretreatment unit includes an automatic backwash filter, and a valve and / or a primary filter screen are provided upstream of the automatic backwash filter.

[0011] Furthermore, the automatic reaction unit also includes a multi-channel injection pump, a multi-position switching valve, and at least one reagent storage container; the outlet of the automatic backwash filter is connected to the first inlet of the multi-channel injection pump; each of the reagent storage containers is connected to the second inlet of the multi-channel injection pump through the multi-position switching valve; and the curved flow channel reactor is connected to the outlet of the multi-channel injection pump.

[0012] Furthermore, the optical detection unit includes a light source, a flow cell, and a photodetector; the outlet of the curved flow channel reactor is connected to the flow cell, and the flow cell is located in the optical path between the light source and the photodetector.

[0013] Furthermore, the control and data processing unit integrates a temperature sensor for temperature compensation correction of the detection results of the optical detection unit.

[0014] Furthermore, the reagent storage container is equipped with a liquid level monitoring device that is signal-connected to the control and data processing unit, which is used to trigger an early warning when the remaining reagent level is below a threshold.

[0015] Furthermore, the control and data processing unit is also communicatively connected to a data interaction interface, which is used to send iron ion concentration data and equipment status signals to the distributed control system and cloud monitoring platform of the thermal power plant.

[0016] Beneficial Effects: This invention achieves online monitoring of iron ion concentration in the steam-water system of thermal power plants by constructing a closed-loop system encompassing sampling pretreatment, a curved flow channel reaction, optical detection, and data processing. The curved flow channel reactor, serving as the flow-guiding component for mixing sample water and reagents, utilizes the secondary flow effect generated when fluid passes through the curved channel to achieve efficient and uniform mixing of reagents and water samples without any internal mechanical stirring. Simultaneously, the fixed flow channel volume ensures a constant residence time in the reaction, thereby guaranteeing the completeness and stability of the colorimetric reaction and improving the accuracy of the detection results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1As shown, an iron ion monitoring device for a steam-water system in a thermal power plant includes: a sampling and pretreatment unit 1 connected to the steam-water system 100 of the power plant for acquiring and filtering water samples; an automatic reaction unit 2 connected to the sampling and pretreatment unit 1, including a curved flow channel reactor 24, for mixing the water sample and colorimetric reagent in flow and completing the colorimetric reaction; an optical detection unit 3 connected to the automatic reaction unit 2 for detecting the absorbance value of the solution after the reaction; and a control and data processing unit 4 for converting the absorbance value into iron ion concentration data. This invention achieves online monitoring of iron ion concentration in a steam-water system of a thermal power plant by constructing a closed-loop system of sampling pretreatment, curved flow channel reaction, optical detection, and data processing. Its core lies in the curved flow channel reactor, which acts as a flow-guiding component for mixing the sample water and reagent. Utilizing the secondary flow effect generated when the fluid passes through the curved flow channel, it achieves efficient and uniform mixing of the reagent and water sample without any internal mechanical stirring device. Meanwhile, the fixed flow channel volume ensures a constant residence time for the reaction, thereby guaranteeing the fullness and stability of the colorimetric reaction and improving the accuracy of the detection results.

[0020] The curved flow channel reactor 24 is a spiral mixing reaction coil or a mixing reaction zigzag tube composed of multiple continuous curved sections. The spiral coil provides uniform and stable mixing, while the zigzag tube provides rapid and efficient mixing. Both are based on the curved flow channel principle, providing users with optimized options for different operating conditions.

[0021] A more specific analysis reveals that spiral coils generate continuous and stable secondary flow, with a gentle and uniform mixing process, making them suitable for most scenarios requiring stable reactions. In contrast, the mixing reaction zigzag tube, through frequent and abrupt changes in flow direction, generates strong vortices and shearing at each bend, resulting in higher mixing intensity and making it suitable for systems requiring rapid mixing. Both structures utilize the principle of bend-induced secondary flow, offering users greater flexibility in their choices based on their respective focuses.

[0022] The sampling and pretreatment unit 1 includes an automatic backwash filter 11, which serves as the main filtration unit and can automatically remove trapped impurities to prevent clogging. Upstream of the automatic backwash filter 11, there is a valve 12 and / or a primary filter screen 13, forming a graded filtration system. The former is used for flow regulation and maintenance isolation, while the latter is used to pre-remove large particulate impurities, together ensuring the long-term and stable acquisition of clean water samples.

[0023] The automatic reaction unit 2 further includes a multi-channel injection pump 21, a multi-position switching valve 22, and at least one reagent storage container 23; the outlet of the automatic backwash filter 11 is connected to the first inlet of the multi-channel injection pump 21; each of the reagent storage containers 23 is connected to the second inlet of the multi-channel injection pump 21 through the multi-position switching valve 22; the curved flow channel reactor 24 is connected to the outlet of the multi-channel injection pump 21. This achieves precise metering and sequential introduction of water samples and various reagents from the reagent storage containers 23, and ultimately pushes the mixture to the curved flow channel reactor 24 for reaction, realizing precise fluid control throughout the entire process from sampling and dosing to reaction.

[0024] The optical detection unit 3 includes a light source 31, a flow cell 32, and a photodetector 33. The outlet of the curved flow channel reactor 24 is connected to the flow cell 32, and the flow cell 32 is located on the optical path 3a between the light source 31 and the photodetector 33. The light beam emitted by the light source 31 passes through the flow cell and is received by the photodetector 33. The iron ion concentration can be calculated by measuring the change in absorbance.

[0025] The control and data processing unit 4 integrates a temperature sensor for temperature compensation correction of the detection results from the optical detection unit 3. The temperature sensor monitors the ambient temperature in real time, thereby providing real-time temperature compensation for the detection results, effectively eliminating the impact of temperature fluctuations on measurement accuracy and improving detection accuracy.

[0026] The reagent storage container 23 is equipped with a liquid level monitoring device that is signal-connected to the control and data processing unit 4, used to trigger an early warning when the remaining reagent level is below a threshold. The liquid level monitoring device employs a sensor such as a capacitive, optical, or float-type sensor.

[0027] The control and data processing unit 4 has at least one output port for connecting to an external alarm relay, which can convert signals such as excessive concentration or equipment failure into switching signals to directly drive the external alarm to sound an alarm.

[0028] The control and data processing unit 4 is also communicatively connected to a data interaction interface, which is used to send iron ion concentration data and equipment status signals to the distributed control system 200 and cloud monitoring platform 9 of the thermal power plant, thereby realizing the integration of monitoring data and production control system, and supporting remote monitoring and intelligent management of equipment.

[0029] Compared with traditional methods for monitoring water vapor iron ion concentration in power plants, this invention has the following advantages:

[0030] 1) The curved flow channel reactor is adopted to achieve efficient mixing without power through the secondary flow effect of fluid. This not only eliminates the failure risk of mechanical stirring, but also ensures the full stability of the colorimetric reaction, which greatly improves the detection accuracy and reliability.

[0031] 2) Integrating IoT technology enables bidirectional transmission of monitoring data with the power plant's DCS system and cloud platform, supporting remote monitoring and intelligent early warning, making the device a key intelligent node in the smart power plant.

[0032] 3) It achieves full automation from sampling to data analysis, shortening the monitoring cycle from hours to minutes, providing continuous and accurate data while effectively reducing the intensity of manual operation and safety risks.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for monitoring iron ions in a steam-water system of a thermal power plant, characterized in that: include: A water and steam system (100) connected to the power plant is used for sampling and pretreatment unit (1) to acquire and filter water samples. Connected to the sampling and pretreatment unit (1), it includes a curved flow channel reactor (24) for an automatic reaction unit (2) to mix the water sample and the colorimetric reagent in the flow and complete the colorimetric reaction. An optical detection unit (3) is connected to the automatic reaction unit (2) for detecting the absorbance value of the solution after the reaction. And a control and data processing unit (4) for converting absorbance values ​​into iron ion concentration data.

2. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 1, characterized in that: The curved flow channel reactor (24) is a spiral mixing reaction coil or a mixing reaction zigzag tube composed of multiple continuous bent sections.

3. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 1, characterized in that: The sampling and pretreatment unit (1) includes an automatic backwash filter (11), and a valve (12) and / or a primary filter screen (13) are provided upstream of the automatic backwash filter (11).

4. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 3, characterized in that: The automatic reaction unit (2) further includes a multi-channel injection pump (21), a multi-position switching valve (22), and at least one reagent storage container (23); the outlet of the automatic backwash filter (11) is connected to the first inlet of the multi-channel injection pump (21); each of the reagent storage containers (23) is connected to the second inlet of the multi-channel injection pump (21) through the multi-position switching valve (22); the curved flow channel reactor (24) is connected to the outlet of the multi-channel injection pump (21).

5. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 4, characterized in that: The optical detection unit (3) includes a light source (31), a flow cell (32) and a photodetector (33); the outlet of the curved flow channel reactor (24) is connected to the flow cell (32), and the flow cell (32) is located on the optical path (3a) between the light source (31) and the photodetector (33).

6. A device for monitoring iron ions in a steam-water system of a thermal power plant according to claim 1 or 4, characterized in that: The control and data processing unit (4) integrates a temperature sensor for temperature compensation correction of the detection results of the optical detection unit (3).

7. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 4, characterized in that: The reagent storage container (23) is equipped with a liquid level monitoring device that is connected to the control and data processing unit (4) for triggering an early warning when the remaining reagent level is below a threshold.

8. The iron ion monitoring device for a steam-water system in a thermal power plant according to claim 1, characterized in that: The control and data processing unit (4) is also connected to a data interaction interface, which is used to send iron ion concentration data and equipment status signals to the distributed control system (200) and cloud monitoring platform (9) of the thermal power plant.

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