A condensate polishing regeneration system waste water resin trap

Abstract

The utility model discloses a kind of condensate water fine treatment regeneration system waste water resin catchers, filter core is installed in cylinder, inlet, outlet, resin discharge port, backflush port are set on the outer wall of cylinder, annular baffle is further provided in cylinder, baffle divides cylinder into two parts of upper space open, lower space closed, inlet is located below baffle, outlet is located above baffle, the inner edge of baffle is fixedly connected fixed ring, the opening end of filter core is provided with fixed flange, filter core is fixedly connected on fixed ring by fixed flange and bolt, compressed gas is imported from backflush port, filter core bottom plate that passes through aperture enters filter core interior, it is caused to violently tumble upwards, outward in filter core interior, filter core is washed from inside to outside.The resin that waste water resin catcher disclosed in the utility model is intercepted by filter core, is soaked by water all the time, cannot lose water and break, filter core installation replacement is convenient, compressed gas is imported in backflush pipe, and it is opposite to resin interception direction, and washing effect is good.

Description

Technical Field

[0001] This utility model belongs to the field of chemical water treatment in power plants, and specifically relates to a resin capture device for wastewater in a condensate polishing and regeneration system. Background Technology

[0002] With the development of the power industry, thermal power plants are increasingly adopting high-parameter, large-capacity units, making the requirements for water quality during unit operation increasingly stringent. To ensure boiler steam quality and mitigate boiler water corrosion, generator units are generally equipped with condensate polishing systems to desalinate the condensate. In condensate polishing systems, the ion exchange equipment used to remove dissolved salts from the water is mostly high-speed cation exchange bed or high-speed mixed bed. The bed is filled with strong acid cation exchange resin and strong base anion exchange resin. After the resin becomes exhausted, external regeneration technology is generally used, where the exhausted resin in the mixed bed is moved to a dedicated regeneration device, and after regeneration, the resin is returned to the mixed bed for operation. During the air rinsing and backwashing processes of resin regeneration, some resin is damaged and needs to be discharged from the regeneration system. Furthermore, resin leakage can occur due to loose water caps. Resin leakage not only results in significant losses but also causes environmental pollution. Wastewater resin traps are essential equipment in fine-treatment regeneration systems designed to address this issue. The wastewater from the regeneration system passes through the wastewater resin trap before being discharged into a drainage ditch or wastewater pool. Leaking resin is intercepted by the wastewater resin trap, preventing it from entering the wastewater system and avoiding resin loss and environmental pollution.

[0003] Chinese Patent Application No. 201922153092.8 discloses a wastewater resin trap with a horizontally arranged filter screen, an inlet pipe above the filter screen, and an outlet pipe below the filter screen. This causes the resin trapped on the filter screen to easily lose water and break down. Chinese Patent Application No. 202120495538.X discloses a wastewater resin trap with a valve on the outlet pipe of the filter screen. The outlet valve is open during operation, which also cannot guarantee that the trapped resin will not lose water and break down. Chinese Patent Application No. 202321805952.1 discloses a wastewater resin trap with a horizontally installed filter element and the outlet pipe positioned at the same height as the filter element. This can ensure to some extent that the trapped resin will not lose water and break down, but its filter element installation and replacement are more difficult. Chinese patents with application numbers 202322354588.8, 202221456208.0 and 201920388459.1 also disclose various wastewater resin traps. The filter elements are all fixed at the lower part or bottom of the resin trap body, which makes the installation or replacement of the filter elements extremely inconvenient. At the same time, the drain pipe is at the bottom of the device body, or the filter element opening is directly connected to the bottom of the device body. This makes the trapped resin easy to lose water and break. Summary of the Invention

[0004] To address the problems of existing technologies, such as the low drain outlet leading to easy water loss and damage of the trapped resin and the inconvenience of filter element installation and replacement, this utility model provides a wastewater resin capture device for a condensate polishing and regeneration system.

[0005] The objective of this utility model is achieved in the following manner:

[0006] A resin trap for condensate polishing and regeneration system includes a cylindrical body with a filter element installed inside. An inlet, an outlet, a resin discharge outlet, and a backwash outlet are located on the outer wall of the cylindrical body. The resin discharge outlet is situated at the bottom of the cylindrical body. An annular partition plate is also installed inside the cylindrical body, with its outer edge fixedly connected to the inner wall of the cylindrical body. The partition plate divides the cylindrical body into two parts: an open upper space and a closed lower space. The inlet is located below the partition plate, and the outlet is located above it. A fixing ring is fixedly connected to the inner edge of the partition plate. The open end of the filter element is... A fixed flange is installed, and the filter element is fixedly connected to the fixed ring by the fixed flange and bolts. The open end of the filter element faces above the isolation plate, and the closed end of the filter element is below the isolation plate. A water-retaining ring is installed at the bottom of the filter element. The backwash port is connected to the backwash pipe inside the cylinder. The end of the backwash pipe faces the bottom plate of the filter element. 60-mesh holes are evenly opened on the bottom plate of the filter element. Compressed gas is introduced into the backwash port. The compressed gas passes through the bottom plate of the filter element and enters the interior of the filter element. Inside the filter element, it causes violent upward and outward tumbling, flushing the filter element from the inside out.

[0007] The outlet diameter is ≥ 1.25 times the inlet diameter.

[0008] The filter element is a wire-wound tube lined with a porous stainless steel tube, with a wire gap of ≤0.25mm. The total filtration area of ​​the filter element is 2.2-2.8 times the cross-sectional area of ​​the inlet.

[0009] The water-retaining ring extends 300mm beyond the bottom plate of the filter element.

[0010] The end of the backwash pipe is 200mm away from the bottom plate of the filter element.

[0011] There is a sealing gasket between the filter element's fixing flange and the fixing ring.

[0012] An air inlet is installed on the outer wall of the cylinder below the isolation plate.

[0013] Sight glasses are installed on the outer wall of the cylinder below the isolation plate.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The outlet is located above the isolation plate, and the inlet is located below the isolation plate. The outlet is higher than the inlet. Regardless of whether the three-tower regeneration system for condensate polishing is running, the wastewater resin capture device is always kept at a high liquid level to ensure that the resin leaking from the condensate polishing system can be continuously soaked in water after being intercepted by the filter element, so as to avoid water loss and damage.

[0016] 2. The upper space of the wastewater resin capture device is open, and the opening end of the filter element has a fixing flange, which is fixed to the fixing ring of the isolation plate by bolts. The filter element fixing flange is directly exposed in the upper open space, and the filter element can be installed and removed very easily by simply tightening and loosening the bolts.

[0017] 3. The end of the backwash pipe faces the bottom of the porous filter element base plate. Compressed gas is passed through the backwash pipe and enters the filter element from the bottom. It squeezes the condensate inside the filter element to flush the outside of the filter element. This is opposite to the direction of resin retention, resulting in a better flushing effect and preventing resin from adhering to the surface of the filter element. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of some wastewater resin capture devices in the existing technology.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the filter element of this utility model.

[0021] In the diagram: 1. Cylinder body, 11. Inlet, 12. Outlet, 13. Resin discharge port, 14. Backwash port, 15. Sight glass, 16. Backwash pipe, 17. Filter element, 2. Water baffle ring, 21. Filter element base plate, 22. Wire winding tube, 23. Isolation plate, 3. Fixing ring, 4. Fixing flange, 5. Sealing gasket. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0023] like Figure 2As shown, a condensate polishing and regeneration system wastewater resin trap includes a cylindrical body 1, a filter element 2 installed inside the cylindrical body, and an inlet 11, an outlet 12, a resin discharge outlet 13, and a backwash outlet 14 provided on the outer wall of the cylindrical body. The resin discharge outlet 13 is located at the bottom of the cylindrical body. An annular partition plate 3 is also provided inside the cylindrical body. The outer edge of the partition plate 3 is fixedly connected to the inner wall of the cylindrical body. The partition plate 3 divides the cylindrical body into two parts: an open upper space (without a top cover) and a closed lower space. The inlet 11 is located below the partition plate, and the outlet 12 is located above the partition plate. A fixing ring 4 is fixedly connected to the inner edge of the partition plate 3. A fixing flange 5 is provided at the open end of the filter element 2. The filter element 2 is fixedly connected to the fixing ring 4 by the fixing flange 5 and bolts. The open end of the filter element faces above the isolation plate 3, and the closed end of the filter element is below the isolation plate 3. A water-blocking ring 21 is set at the bottom of the filter element. The backwash port 14 is connected to the backwash pipe 17 inside the cylinder. The backwash pipe 17 turns upward at the center of the cylinder. The end of the backwash pipe faces the filter element bottom plate 22. The optimal distance between the backwash pipe and the porous filter element bottom plate 22 is 200mm. The filter element bottom plate has evenly opened holes with a diameter of 60 mesh. Compressed gas passes through the filter element bottom plate 22 and enters the filter element. It causes violent upward and outward tumbling inside the filter element, flushing the filter element from the inside out.

[0024] Because the upper space of the wastewater resin trap is open, the open end of the filter element is fixed to the fixing ring of the isolation plate by fixing flange 5 and bolts. The fixing flange of the filter element is directly exposed to the upper open space, and the filter element can be installed and removed very easily by simply tightening and loosening the bolts.

[0025] Furthermore, there is a sealing gasket 6 between the fixing flange 5 and the fixing ring 4 of the filter element. The sealing gasket is made of elastic sealing materials such as acid-resistant rubber, polytetrafluoroethylene, and polypropylene.

[0026] During operation of the three-tower regeneration system for condensate polishing, some resin is damaged due to the impact of backwashing and air scrubbing and needs to be discharged from the regeneration system. Additionally, a few water caps may loosen during the regeneration process, resulting in minor resin leakage. The drainage pipe of the three-tower regeneration system for condensate polishing is connected to the inlet 11 of the wastewater resin trap. The regeneration system wastewater carrying resin enters the lower space separated by the partition plate inside the cylinder 1 through the inlet 11 under gravity. The wastewater is filtered by the filter element 2, and the condensate escapes into the filter element through the filtration gaps fixed to the partition plate's fixing ring. As the liquid level inside the cylinder rises, the filtered condensate flows out by gravity through the outlet 12 above the partition plate 3. Leaked resin and larger resin fragments are trapped outside the filter element 2.

[0027] Since the inlet 11 is located below the isolation plate and the outlet 12 is located above the isolation plate, with the outlet higher than the inlet, the wastewater resin capture device always maintains a high liquid level regardless of whether the condensate polishing three-tower regeneration system is running. This ensures that the resin leaking from the condensate polishing system is continuously soaked in water after being intercepted by the filter element, preventing it from losing water and breaking.

[0028] When resin is found adhering to the surface of filter element 2, even affecting its filtration function, compressed gas is introduced through backwash port 14. The compressed gas passes through the bottom plate of the filter element and enters the interior of the filter element, causing violent upward and outward turbulence inside. This violent fluctuation, opposite to the direction of resin retention, flushes the filter element from the inside out, washing away the resin adhering to its surface to prevent clogging. Compared to the prior art which uses a stirring device at the top of the filter element, the backwashing structure disclosed in this invention is simpler and does not affect the installation and disassembly of the filter element.

[0029] Furthermore, the outlet diameter should be ≥1.25 times the inlet diameter. This can reduce the flow rate of condensate after filtration, improve the filtration effect of the filter element, and also help reduce filter element clogging and extend its service life.

[0030] like Figure 3 As shown, the filter element 2 is a porous stainless steel tube lined with a wound wire tube 23, the wire gap being ≤0.25mm. The total filtration area of ​​the filter element is 2.2-2.8 times the cross-sectional area of ​​the inlet. If the designed flow rate of the inlet is 2.2-2.5m / s, the total filtration area of ​​the filter element is designed to be 2.5-2.8 times the cross-sectional area of ​​the inlet; if the designed flow rate of the inlet is 1.8-2.2m / s, the total filtration area of ​​the filter element is designed to be 2.2-2.5 times the cross-sectional area of ​​the inlet.

[0031] The stainless steel tube lining the filter element extends 300mm out of the filter element bottom plate to form a water-blocking ring 21. The water-blocking ring 21 plays a role in gathering compressed gas and causing it to impact the porous filter element bottom plate during the backwashing pipeline.

[0032] Furthermore, an air inlet 15 is provided on the outer wall of the cylinder 1 below the isolation plate 3. During the process of filling the condensate polishing three-tower regeneration system equipment with water, some water and a very small amount of resin will be discharged through the exhaust pipe. The exhaust pipe of the condensate polishing three-tower regeneration system is connected to the air inlet 15 of the wastewater resin capture device. Gas, water and resin enter the lower space of the cylinder from the air inlet 15 of the wastewater resin capture device. Gas and water escape into the filter element through the filter gaps of the filter element fixed on the isolation plate fixing ring. The liquid level rises to the outlet position and flows out from the outlet by gravity. Gas escapes into the air from the open top of the cylinder, while the leaked resin and larger resin fragments are trapped outside the filter element.

[0033] Furthermore, a sight glass 16 is installed on the outer wall of the cylinder below the isolation plate. When it is observed through the sight glass 16 that too much resin is trapped inside the cylinder, the resin discharge port 13 is connected to a container that can store resin, and the valve of the resin discharge port is opened to discharge the resin. This also facilitates timely backwashing by introducing air from the backwash port according to the amount of resin trapped.

[0034] All other details not described in detail are existing technologies.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A resin capture device for wastewater in a condensate polishing and regeneration system, comprising a cylinder (1), a filter element (2) installed inside the cylinder, an inlet (11), an outlet (12), a resin discharge outlet (13), and a backwash outlet (14) provided on the outer wall of the cylinder, the resin discharge outlet (13) being located at the bottom of the cylinder, characterized in that: The cylinder is also equipped with an annular partition plate (3). The outer edge of the partition plate (3) is fixedly connected to the inner wall of the cylinder. The partition plate (3) divides the cylinder into two parts: an open upper space and a closed lower space. The inlet (11) is located below the partition plate, and the outlet (12) is located above the partition plate. The inner edge of the partition plate (3) is fixedly connected to a fixing ring (4). The filter element (2) is provided with a fixing flange (5) at its open end. The filter element (2) is fixedly connected to the fixing ring (4) by the fixing flange (5) and bolts. The filter element is positioned above the isolation plate (3), with the closed end below the isolation plate (3). A water-blocking ring (21) is installed at the bottom of the filter element. The backwash port (14) is connected to the backwash pipe (17) inside the cylinder. The end of the backwash pipe (17) faces the bottom plate (22) of the filter element. Holes with a diameter of 60 mesh are evenly opened on the bottom plate (22). Compressed gas is introduced through the backwash port. The compressed gas passes through the bottom plate (22) of the filter element and enters the interior of the filter element, causing violent upward and outward tumbling inside the filter element, thus flushing the filter element from the inside out.

2. The condensate polishing and regeneration system wastewater resin capture device according to claim 1, characterized in that: The outlet diameter is ≥ 1.25 times the inlet diameter.

3. The condensate polishing and regeneration system wastewater resin capture device according to claim 1, characterized in that: The filter element (2) is a wire-wound tube lined with a porous stainless steel tube, with a wire-wound gap of ≤0.25mm. The total filtration area of ​​the filter element is 2.2-2.8 times the cross-sectional area of ​​the inlet.

4. The condensate polishing and regeneration system wastewater resin capture device according to claim 3, characterized in that: The water-blocking ring (21) extends 300mm out of the bottom plate of the filter element.

5. The condensate polishing and regeneration system wastewater resin trap according to claim 4, characterized in that: The end of the backwash pipe is 200mm away from the bottom plate of the filter element.

6. The condensate polishing and regeneration system wastewater resin trap according to claim 4, characterized in that: There is a sealing gasket (6) between the filter element's fixing flange (5) and fixing ring (4).

7. The condensate polishing and regeneration system wastewater resin trap according to claim 1, characterized in that: An air inlet (15) is provided on the outer wall of the cylinder (1) below the isolation plate (3).

8. The condensate polishing and regeneration system wastewater resin trap according to claim 1, characterized in that: A sight glass (16) is installed on the outer wall of the cylinder below the isolation plate.

Images