A resin failure real-time visual indicator for a polishing mixed bed of a thermal power plant

Abstract

The utility model relates to ion exchange equipment technical field discloses a resin failure instant visualization indicator for thermal power plant fine treatment mixed bed, including transparent pipe body and two main road isolation valves, the transparent pipe body surface is equipped with the protection shell, both sides of protection shell are fixedly connected with flange plate no.

Description

Technical Field

[0001] This utility model relates to the field of ion exchange equipment technology, and in particular to an instant visualization indicator of resin failure for a mixed bed used in the fine treatment of thermal power plants. Background Technology

[0002] In the chemical water treatment system of thermal power plants, the fine treatment mixed bed is a key device to ensure the quality of water and steam. It uses the synergistic effect of anionic and cationic resins to carry out deep desalination of condensate, thereby ensuring that the water entering core equipment such as boilers and turbines meets strict standards, avoiding problems such as equipment corrosion and scaling caused by substandard water quality, and ensuring the safe and stable operation of the unit.

[0003] However, accurately determining whether the resin in the mixed bed has failed remains a major challenge for operators during actual operation. Currently, the commonly used methods in the industry have significant flaws: switching the mixed bed based on operating time is problematic because the influent water quality fluctuates due to factors such as unit load and makeup water quality, often resulting in the resin being switched before it has fully utilized its capabilities, leading to wasted resin resources and increased regeneration costs; relying on the pressure difference between the inlet and outlet of the mixed bed is also problematic because the pressure difference is affected by factors such as resin layer height, resin contamination level, and uneven water flow velocity distribution, failing to accurately reflect whether the resin's ion exchange capacity has been depleted, potentially leading to overuse of resin and affecting effluent quality; the traditional conductivity meter monitoring method indirectly determines resin failure by monitoring changes in the conductivity of the effluent, but this method has a significant lag. When the conductivity meter shows that the water quality exceeds limits, the resin in the mixed bed has actually been ineffective for some time, potentially already causing adverse effects on subsequent equipment. Moreover, conductivity meters require regular instrument calibration, a cumbersome process that not only consumes manpower and resources but may also lead to distorted measurement data due to untimely calibration, resulting in misjudgments of resin failure status and posing a threat to the safe and stable operation of the entire water-steam system. To address these issues, a real-time visual indicator of resin failure for fine treatment mixed beds in thermal power plants is proposed. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an instant visualization indicator for resin failure in mixed beds used in the fine treatment of thermal power plants. It aims to improve the existing technology of judging mixed bed resin failure by operating time, inlet and outlet pressure difference, and traditional conductivity monitoring. This method suffers from problems such as resource waste, judgment distortion, lag, and cumbersome verification leading to misjudgment, which affect the safe and stable operation of the system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an instant visual indicator for resin failure in a mixed bed of a thermal power plant, comprising a transparent tube and two main isolation valves. A protective shell is fitted on the surface of the transparent tube. Flange 1 is fixedly connected to both sides of the protective shell. Flange 2 is fixedly installed on one side of each of the two flanges 1 by bolts. Flange 2 is fixedly connected to one end of each of the two main isolation valves. A main pipeline is fixedly installed on the other end of each of the two main isolation valves. A flow guiding component is installed on one side of each of the two main pipelines. An indicator component is provided inside the transparent tube. The indicator component includes a color-changing resin core and two current-stabilizing grids. The color-changing resin core is disposed in the middle of the inner wall of the transparent tube, and current-stabilizing grids are disposed at both ends of the inner wall of the transparent tube.

[0006] Preferably, the flow guiding assembly includes two bypass valves, which are respectively fixedly connected to one side of the two main pipelines, and one end of each of the two bypass valves is fixedly connected to a bypass pipeline.

[0007] Preferably, the transparent tube has graduation lines on its surface, and the protective shell has an observation window at the corresponding graduation lines on its surface.

[0008] Preferably, a transparent plate is fixedly connected to the inner wall of the observation window.

[0009] Preferably, the surface of the current stabilizing grid has a plurality of circular holes, which are radially distributed in concentric circles on the surface of the current stabilizing grid.

[0010] Preferably, a rubber retaining ring is fixedly connected to the outside of the current stabilizing grid, and slots are provided at both ends of the inner wall of the protective shell, with the rubber retaining ring engaging with the inner wall of the slot.

[0011] Preferably, the current-stabilizing grid is fixedly connected to a handle on the side facing away from the color-changing resin core.

[0012] Preferably, the protective shell has brackets fixedly connected to both sides of its bottom.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the instant visual indicator of resin failure is intuitive and visual. Operators do not need to rely on complex instruments or analyze tedious data. They can quickly and accurately determine whether the mixed bed resin has failed by directly observing the color change of the color-changing strong acid cation resin inside the transparent tube. This improves the efficiency and accuracy of judgment and reduces the probability of human error. Moreover, the instant visual indicator of resin failure can achieve real-time monitoring. Compared with the traditional conductivity meter monitoring method, this indicator has no lag. Once the resin in the mixed bed begins to fail and cations penetrate the mixed bed into the effluent, the color-changing strong acid cation resin in the transparent tube will immediately react with these cations and begin to change color. It can reflect the changes in cations in the effluent quality of the mixed bed in real time and promptly remind operators to take appropriate measures.

[0014] 2. In this utility model, the resin failure instant visual indicator has a simple structure and high reliability. The entire indicator is mainly composed of simple components such as a transparent tube, color-changing strong acid cation resin, and current-stabilizing grid. There are no complex electronic components, no need for external power supply, which reduces the possibility of failure. At the same time, the material selection of each component takes into account the operating environment of thermal power plants, and has good corrosion resistance, high temperature resistance and aging resistance. It is easy to install, has low maintenance cost, and saves the tedious work of regularly calibrating the instrument.

[0015] 3. In this utility model, the resin failure instant visual indicator has a strong auxiliary judgment function. The scale markings on the outside of the transparent tube are clear and accurate, which can help operators accurately judge the height of the resin failure layer, thereby initially assessing the degree of failure of the mixed bed resin and estimating the remaining operating time of the mixed bed. This provides a reliable reference for timely switching of the mixed bed or reasonable arrangement of resin regeneration work, which helps to improve the resin utilization rate and reduce operating costs. Moreover, the resin failure instant visual indicator has strong adaptability. The transparent tube can be made of a variety of high-quality materials. The design of the protective shell makes it adaptable to different operating environments of thermal power plants. It can work stably in water and steam systems with different pressure and temperature ranges, and has wide applicability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of an instant visual indicator of resin failure for a mixed bed in the fine treatment of a thermal power plant, as proposed in this utility model. Figure 2 This is a schematic diagram of the protective shell of a real-time visual indicator for resin failure in a mixed bed of a thermal power plant, as proposed in this utility model. Figure 3 This is a schematic diagram of the structure of the transparent tube body of a real-time visualization indicator for resin failure in a mixed bed of a thermal power plant, as proposed in this utility model. Figure 4This is a schematic diagram of the structure of the current stabilization grid of a real-time visualization indicator for resin failure in a mixed bed of a thermal power plant, as proposed in this utility model.

[0017] Legend: 1. Protective shell; 2. Main pipeline; 3. Main pipeline isolation valve; 4. Bypass valve; 5. Bypass pipeline; 6. Transparent plate; 7. Transparent pipe body; 8. Scale lines; 9. Bracket; 10. Color-changing resin core; 11. Flow stabilizing grid; 12. Slot; 13. Rubber retaining ring; 14. Handle; 15. Observation window; 16. Flange 1; 17. Flange 2; 18. Round hole. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0019] Reference Figures 1-3 This utility model provides an embodiment of an instant visual indicator for resin failure in a mixed bed of a thermal power plant's finishing process. It includes a transparent tube 7 and two main isolation valves 3. A protective shell 1 is fitted over the surface of the transparent tube 7, providing physical protection against damage from external impacts. Flanges 16 are fixedly connected to both sides of the protective shell 1, providing a stable interface for the connection between the protective shell 1 and external structures. Two flanges 17 are bolted to one side of each flange 16. Flange 2 17 and flange 1 16 work together to securely connect the protective shell 1 to the main isolation valve 3. The two flanges 2 17 are fixedly connected to one end of the two main isolation valves 3 respectively. The main isolation valve 3 can control the opening and closing of the main pipeline where the transparent pipe 7 is located, which is convenient for subsequent maintenance operations. The other end of the two main isolation valves 3 is fixedly installed with a main pipeline 2. The main pipeline 2 provides a channel for water sample flow and introduces the mixed bed outlet water into the transparent pipe 7. A flow guiding component is installed on one side of the two main pipelines 2, and an indicator component is installed inside the transparent pipe 7. Reference Figure 3 The indicator component includes a color-changing resin core 10 and two flow-stabilizing grids 11. The color-changing resin core 10 is located in the middle of the inner wall of the transparent tube 7. The color-changing strong acid cation exchange resin in the color-changing resin core 10 can react with the cations in the water sample and change color, which can intuitively reflect the failure state of the mixed bed resin. Flow-stabilizing grids 11 are provided at both ends of the inner wall of the transparent tube 7. The flow-stabilizing grids 11 can stabilize the water sample flow rate and ensure that the water sample is in full contact with the color-changing resin core 10.

[0020] Reference Figure 1 The diversion assembly includes two bypass valves 4, which are fixedly connected to one side of the two main pipelines 2 respectively. The bypass valves 4 can control the opening and closing of the bypass pipeline 5 to realize the switching between the main pipeline and the bypass. One end of the two bypass valves 4 is fixedly connected to the bypass pipeline 5. The bypass pipeline 5 ensures continuous water supply to the system during main pipeline maintenance to avoid unit shutdown.

[0021] Reference Figure 2 and Figure 3 The transparent tube 7 has a scale line 8 on its surface. The scale line 8 can help to quantitatively observe the failure layer height of the discolored resin and assess the degree of failure. The protective shell 1 has an observation window 15 on its surface corresponding to the scale line 8. The observation window 15 provides a visual channel for operators to observe the color change of the resin inside the transparent tube 7.

[0022] Reference Figure 1 and Figure 2 A transparent plate 6 is fixedly connected to the inner wall of the observation window 15. The transparent plate 6 seals the observation window 15, preventing external impurities from entering while not affecting the observation line of sight. It is made of transparent acrylic sheet.

[0023] Reference Figure 4 The surface of the flow stabilizing grid 11 has several circular holes 18. The circular holes 18 are arranged in a concentric radial pattern on the surface of the flow stabilizing grid 11. The radial circular holes 18 can evenly disperse the water flow, reduce the impact of the water flow, and ensure that the water sample flows smoothly through the resin layer.

[0024] Reference Figure 3 and Figure 4 A rubber retaining ring 13 is fixedly connected to the outside of the flow stabilizing grid 11. Both ends of the inner wall of the protective shell 1 are provided with slots 12. The rubber retaining ring 13 is engaged with the inner wall of the slot 12. The cooperation between the rubber retaining ring 13 and the slot 12 enables the quick disassembly and fixing of the flow stabilizing grid 11, which is convenient for cleaning and replacement.

[0025] Reference Figure 3 A handle 14 is fixedly connected to the side of the current stabilizing grid 11 away from the color-changing resin core 10. The handle 14 provides a force point for disassembling and assembling the current stabilizing grid 11, making it easy to operate.

[0026] Reference Figure 2 Both sides of the bottom of the protective shell 1 are fixedly connected to brackets 9, which support and fix the protective shell 1 firmly on the outlet pipeline of the mixed bed, ensuring the overall installation stability.

[0027] Working Principle: This real-time visual indicator for resin failure is connected in series on the mixed bed outlet pipeline. The transparent tube 7 is made of pressure-resistant, temperature-resistant, and UV-resistant transparent polymer material (polysulfone PSU or modified PMMA), integrally machined, with a design pressure ≥1.0MPa and a design temperature of 5-60℃. It has an inner diameter of 20mm, an outer diameter of 38mm, and a length of 120mm. The outer surface has axial graduation lines 8 with a depth of 0.5mm for easy quantitative observation of the resin color change length. The color-changing resin core 10 is filled with 5mL (±0.2mL) of color-changing strong acid cation exchange resin in the middle section of the transparent tube 7. The resin skeleton is a styrene-divinylbenzene copolymer, and the functional groups are sulfonic acid type (-SO3-H). + ), Factory type H+ When the exchange capacity is exhausted, it turns into Na + When the color change occurs, the indicator dye undergoes a color reaction, instantly changing from emerald green (pH≤5.0) to amber (pH≥7.0). The color change threshold is synchronized with the resin capacity utilization rate of 100%. The resin particle size is 0.6–0.8 mm, the conversion volume expansion rate is ≤5%, and it can be regenerated more than 50 times with 4% HCl. The circular flow stabilizing grid 11 is located on the upstream and downstream end faces of the color-changing resin core 10. It is made of 316L stainless steel with a thickness of 1 mm. The openings are concentric radial, with a pore diameter of 3 mm and an opening rate of 40%, which can both... To effectively prevent discoloration of strong acid cation exchange resin particles from flowing out of the transparent tube 7, and to ensure that the water sample flows smoothly through the resin layer, allowing the water sample to fully contact the resin, the flow stabilizing grid 11 is connected to the transparent tube 7 through a snap-fit ​​structure. The snap-fit ​​structure consists of a slot 12 set on the inner wall of both ends of the transparent tube 7 and a rubber snap ring 13 corresponding to the edge of the flow stabilizing grid 11. During installation, the snap ring of the flow stabilizing grid 11 is snapped into the slot 12 of the transparent tube 7 to fix the flow stabilizing grid 11. It is easy to disassemble and facilitates cleaning and replacement of the flow stabilizing grid 11.

[0028] A bypass pipeline 5 is connected in parallel to the inlet and outlet ends of the transparent tube 7 via a DN15 stainless steel needle valve. When it is necessary to replace or regenerate the color-changing resin core 10 online, the main isolation valve 3 is closed and the bypass valve 4 is opened, which can ensure that the unit does not stop and the system does not stop water supply. The bypass pipeline 5 is designed to have a flow rate ≥ 120% of the main pipeline and a pressure drop ≤ 0.01MPa. The protective shell 1 is made of stainless steel and has a tubular structure. It is fitted on the outside of the transparent tube 7. The protective shell 1 has an observation window 15 corresponding to the transparent tube 7. The observation window 15 is sealed with a transparent acrylic plate, which can protect the transparent tube 7 from damage by external impact without affecting the observation of the operators. The protective shell 1 is fixedly connected to the mixed bed outlet pipeline through a bracket 9. The bracket 9 is made of angle steel. One end is welded to the protective shell 1 and the other end is connected to the mixed bed outlet pipeline by bolts to ensure that the transparent window assembly is firmly installed.

Claims

1. A real-time visual indicator for resin failure in a mixed bed refining process of a thermal power plant, comprising a transparent tube (7) and two main isolation valves (3), characterized in that: The transparent tube (7) is fitted with a protective shell (1). Both sides of the protective shell (1) are fixedly connected to flange one (16). Flange two (17) is fixedly installed on one side of each of the two flange one (16) by bolts. The two flange two (17) are respectively fixedly connected to one end of each of the two main isolation valves (3). The other end of each of the two main isolation valves (3) is fixedly installed with a main pipeline (2). A flow guiding component is installed on one side of each of the two main pipelines (2). An indicator component is provided inside the transparent tube (7). The indicator component includes a color-changing resin core (10) and two current-stabilizing grids (11). The color-changing resin core (10) is disposed in the middle of the inner wall of the transparent tube (7), and current-stabilizing grids (11) are disposed at both ends of the inner wall of the transparent tube (7).

2. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: The flow guiding assembly includes two bypass valves (4), which are respectively fixedly connected to one side of the two main pipelines (2), and one end of the two bypass valves (4) is fixedly connected to a bypass pipeline (5).

3. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: The transparent tube (7) has scale lines (8) on its surface, and the protective shell (1) has an observation window (15) on its surface corresponding to the scale lines (8).

4. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant, as described in claim 3, is characterized in that: A transparent plate (6) is fixedly connected to the inner wall of the observation window (15).

5. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: The surface of the current stabilizing grid (11) has a plurality of circular holes (18), which are arranged in a concentric radial pattern on the surface of the current stabilizing grid (11).

6. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: A rubber retaining ring (13) is fixedly connected to the outside of the current stabilizing grid (11), and slots (12) are provided at both ends of the inner wall of the protective shell (1), and the rubber retaining ring (13) is engaged with the inner wall of the slot (12).

7. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: A handle (14) is fixedly connected to the side of the current stabilizing grid (11) away from the color-changing resin core (10).

8. The real-time visual indicator of resin failure for a mixed bed in the finishing process of a thermal power plant according to claim 1, characterized in that: The protective shell (1) has brackets (9) fixedly connected to both sides of its bottom.

Images