A treatment device for a power plant boiler make-up water source

Abstract

The application relates to a treatment device for a power plant boiler make-up water source, which comprises a first pipeline mixer, a second pipeline mixer and a main reactor connected in sequence, the first pipeline mixer is connected with a first alkaline dosing device, the second pipeline mixer is connected with a second alkaline dosing device and a coagulant dosing device; the main reactor comprises a reinforced reaction part, an inclined pipe separation part and a sludge scraper, the reinforced reaction part is located in the middle upper part of the center of the main reactor and comprises an inner cylinder and an outer cylinder, the second pipeline mixer is connected with the inner part of the inner cylinder through a water inlet pipe, and the coagulant dosing device is connected with the inner part of the inner cylinder through a pipeline; the top of the inner cylinder is open and communicates with the inner space of the outer cylinder, the top of the outer cylinder is higher than the liquid level of the main reactor, the bottom of the outer cylinder is open, so that the water inlet of the inner cylinder flows through the inner cylinder and the outer cylinder in sequence; the outer side of the reinforced reaction part is provided with the inclined pipe separation part, the inclined pipe separation part is located in the upper part of the main reactor, and the sludge scraper can rotate to promote sludge discharge at the bottom of the main reactor.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically relating to a treatment device for boiler feedwater in power plants. Background Technology

[0002] Previously, power plant boilers used groundwater for makeup water. To conserve water, makeup water now mostly comes from recycled wastewater, municipal greywater, and reservoir water. Using surface water resources presents several problems: these water sources contain pollutants such as calcium ions, magnesium ions, and silica, and are characterized by high salinity, high hardness, and high suspended solids.

[0003] Currently, the treatment of boiler feedwater in power plants can be divided into three stages: primary physicochemical pretreatment (conventionally using mechanically accelerated clarifiers, high-density sedimentation, variable porosity filters, V-type filters, etc.), secondary pre-desalination treatment (conventionally using ultrafiltration + reverse osmosis, etc.), and tertiary deep desalination treatment (conventionally using secondary reverse osmosis + EDI, etc.). However, for the primary pretreatment process, mechanically accelerated clarifiers are not very effective at removing hardness and suspended solids, mainly due to uneven mixing of chemicals and wastewater, and poor sludge settling in the sedimentation zone, resulting in unsatisfactory treatment results. High-density sedimentation tanks involve large dosages of chemicals, resulting in large sludge production, and sludge accumulation in the coagulation and flocculation zones. Furthermore, the hardness and suspended solids content of the wastewater after primary physicochemical pretreatment remain high, failing to meet the requirements for stable operation of subsequent treatment systems. Summary of the Invention

[0004] To address the above problems, the present invention provides a treatment device for boiler feedwater in power plants, comprising a first pipeline mixer, a second pipeline mixer, and a main reactor connected in sequence. The first pipeline mixer is connected to a first alkaline dosing device, and the second pipeline mixer is connected to a second alkaline dosing device and a coagulant dosing device.

[0005] The main reactor includes an enhanced reaction section, an inclined tube separation section, and a sludge scraper. The enhanced reaction section is located in the upper middle part and center of the main reactor. The enhanced reaction section has a sleeve structure, including an inner cylinder and an outer cylinder. A second pipeline mixer is connected to the inside of the inner cylinder through an inlet pipe to feed water into the inner cylinder. A flocculant dosing device is connected to the inside of the inner cylinder through a pipeline. The top of the inner cylinder is open and connects to the internal space of the outer cylinder. The top of the outer cylinder is higher than the liquid level of the main reactor, and the bottom of the outer cylinder is open, so that the water entering the inner cylinder flows through the inner cylinder and the outer cylinder in sequence before being discharged into the main reactor.

[0006] An inclined tube separation section is provided on the outside of the enhanced reaction section. The inclined tube separation section is located above the main reactor. The sludge scraper can rotate to promote sludge discharge from the bottom of the main reactor.

[0007] Optionally, the first pipeline mixer includes two inlets and one outlet. One inlet is used to input the raw water to be treated, the other inlet is connected to a first alkaline dosing device, and the outlet is connected to one inlet of a second pipeline mixer via a pipeline.

[0008] Optionally, the first alkaline dosing device includes a first chemical tank containing lime slurry or liquid alkali. The first chemical tank is connected to a first pipeline mixer via a corresponding pump and control valve, so that the raw water is mixed with the lime slurry or liquid alkali in the first pipeline mixer.

[0009] Optionally, the second pipeline mixer includes three inlets and one outlet. One inlet is connected to the outlet of the first pipeline mixer, another inlet is connected to the second alkaline dosing device, and yet another inlet is connected to the coagulant dosing device. The outlet is connected to the inside of the inner cylinder through an inlet pipe.

[0010] Optionally, the second alkaline dosing device includes a second tank containing a soda ash solution; the coagulant dosing device includes a third tank containing a conventional coagulant solution.

[0011] The second and third medicine tanks are connected to the second pipeline mixer via their respective pumps and control valves, so that the water discharged from the first pipeline mixer is then mixed with the soda ash solution and coagulant.

[0012] Optionally, the main reactor is cylindrical and has an overflow trough and an outlet pipe at the top. The bottom of the main reactor has an inclined bottom surface, and the edge of the bottom surface is higher than the center of the bottom surface. A sludge discharge port is provided at the center of the bottom surface. The sludge discharge port is connected to a sludge treatment device through a pipe for treating the sludge obtained from the main reactor.

[0013] Optionally, both the inner and outer cylinders are cylindrical and concentrically arranged. The outlet of the water inlet pipe is located in the lower middle part of the inner cylinder. A circular dosing ring is provided above the outlet of the water inlet pipe. The dosing ring is concentrically arranged with the inner cylinder. The dosing ring is connected to the flocculant dosing device through a pipeline.

[0014] The bottom of the inner cylinder is open, and a dispersion hood is provided below the inner cylinder. The dispersion hood is conical, and a first motor is provided at the top inside the dispersion hood to connect to and drive the sludge scraper to rotate. The bottom of the outer cylinder corresponds to the inclined side of the dispersion hood, but does not contact the inclined side, so that the water flowing out of the inner and outer cylinders enters other parts of the main reactor after being dispersed by the dispersion hood. Large solid particles settled in the inner cylinder slide down the dispersion hood to the bottom of the main reactor.

[0015] Optionally, the first motor is a dual-shaft motor, with the inner shaft pointing upwards and the outer shaft pointing downwards. A vertical first stirring shaft is provided at the center of the sludge scraper, and the top of the first stirring shaft is connected to the outer shaft of the first motor, thereby driving the sludge scraper to rotate and driving the sludge at the bottom of the main reactor to move towards the center of the bottom surface.

[0016] Further optionally, the inner cylinder is provided with a spiral stirrer, which includes spiral blades and a vertical second stirring shaft. The bottom end of the second stirring shaft is connected to the upward shaft of the first motor, thereby driving the spiral stirrer to rotate. The inner side of the spiral blades is fixedly connected to the second stirring shaft, and the outer side extends into the inner cylinder and has a gap with the inner wall of the inner cylinder, so as not to affect the rotation of the spiral stirrer.

[0017] The spiral blades are spirally arranged along the length of the second stirring shaft and uniformly around the circumference of the inner cylinder, and the diameter of the spiral blades gradually increases from bottom to top.

[0018] Alternatively, the inner wall of the inner cylinder and the surface of the spiral blades are both smooth surfaces to avoid generating too many air bubbles in the water inside the inner cylinder.

[0019] Optionally, the top of the inner cylinder is provided with a funnel-shaped overflow sidewall, the bottom of the overflow sidewall is connected to the top of the inner cylinder sidewall, the top of the overflow sidewall is higher than the liquid level in the inner cylinder, and the overflow sidewall is inclined outward to form an inverted frustum shape.

[0020] The overflow sidewall is equipped with a rotating defoamer, which includes a circular wheel and a vertical third stirring shaft. The wheel is placed horizontally and is wave-shaped, that is, there are several peaks and troughs along the circumference of the wheel. The peaks and troughs are arranged alternately to form a peak-trough-peak-trough arrangement. The middle part of the wheel is close to or flush with the liquid surface of the inner cylinder.

[0021] A second motor is installed at or above the top of the main reactor. The shaft of the second motor is connected to the top of the third stirring shaft, thereby driving the wheel to rotate.

[0022] Further optionally, the number of crests on the wheel is equal to the number of troughs, the height of the highest crest is equal to the depth of the lowest trough, the width of the widest part at the bottom of the crest is equal to the width of the widest part at the top of the trough; the vertical line corresponding to the highest point of the crest is the central axis of the crest, and there is a trough between the two closest crests. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the treatment device for the boiler feedwater source of the power plant;

[0024] Figure 2 A schematic diagram to enhance the reaction section and dispersion hood.

[0025] In the attached diagram, 1-first pipeline mixer, 2-second pipeline mixer, 3-main reactor, 4-first alkaline dosing device, 5-second alkaline dosing device, 6-coagulant dosing device, 7-flocculant dosing device, 8-enhanced reaction section, 9-inclined tube separation section, 10-sludge scraper, 11-inner cylinder, 12-outer cylinder, 13-inlet pipe, 14-overflow trough, 15-outlet pipe, 16-dosing ring, 17-hollow mesh cage, 18-dispersion hood, 19-first motor, 20-second motor, 21-first stirring shaft, 22-second stirring shaft, 23-third stirring shaft, 24-closed cavity, 25-spiral stirrer, 26-overflow sidewall, 27-rotating defoamer, 28-wheel, 29-spiral turbulence mesh cage one. Detailed Implementation

[0026] This embodiment provides a treatment device for the feedwater source of power plant boilers, such as... Figures 1-2 As shown, it includes a first pipeline mixer 1, a second pipeline mixer 2 and a main reactor 3 connected in sequence. The first pipeline mixer 1 is connected to a first alkaline dosing device 4, and the second pipeline mixer 2 is connected to a second alkaline dosing device 5 and a coagulant dosing device 6.

[0027] The main reactor 3 includes an enhanced reaction section 8, an inclined tube separation section 9, and a sludge scraper 10. The enhanced reaction section 8 is located in the upper middle part of the main reactor 3 and at the center of the main reactor 3. The enhanced reaction section 8 has a sleeve structure, including an inner cylinder 11 and an outer cylinder 12. The second pipeline mixer 2 is connected to the inside of the inner cylinder 11 through the water inlet pipe 13 to feed water into the inner cylinder 11. The flocculant dosing device 7 is connected to the inside of the inner cylinder 11 through a pipeline. The top of the inner cylinder 11 is open and connects to the internal space of the outer cylinder 12. The top of the outer cylinder 12 is higher than the liquid level of the main reactor 3, and the bottom of the outer cylinder 12 is open, so that the water entering the inner cylinder 11 flows through the inner cylinder 11 and the outer cylinder 12 in sequence, and then is discharged into the main reactor 3.

[0028] An inclined tube separation section 9 is provided on the outside of the enhanced reaction section 8. The inclined tube separation section 9 is located at the top of the main reactor 3. The sludge scraper 10 can rotate to promote the discharge of sludge from the bottom of the main reactor 3.

[0029] Optionally, the first pipeline mixer 1 includes two inlets and one outlet. One inlet is used to input the raw water to be treated, the other inlet is connected to the first alkaline dosing device 4, and the outlet is connected to one inlet of the second pipeline mixer 2 via a pipeline.

[0030] Optionally, the first alkaline dosing device 4 includes a first chemical tank containing lime slurry or liquid alkali. The first chemical tank is connected to a first pipeline mixer 1 via a corresponding pump and control valve, so that the raw water is mixed with the lime slurry or liquid alkali in the first pipeline mixer 1.

[0031] Optionally, the second pipeline mixer 2 includes three inlets and one outlet. One inlet is connected to the outlet of the first pipeline mixer 1, another inlet is connected to the second alkaline dosing device 5, and yet another inlet is connected to the coagulant dosing device 6. The outlet is connected to the inside of the inner cylinder 11 through the water inlet pipe 13.

[0032] Optionally, the second alkaline dosing device 5 includes a second tank containing a soda ash solution; the coagulant dosing device 6 includes a third tank containing a conventional coagulant solution.

[0033] The second and third medicine tanks are connected to the second pipeline mixer 2 via their respective pumps and control valves, so that the water discharged from the first pipeline mixer 1 is mixed with the soda ash solution and coagulant.

[0034] This invention employs a dual-alkali method for hardening removal (lime / sodium hydroxide, soda ash). Lime slurry or liquid alkali, soda ash solution, and coagulant are mixed through two pipe mixers, allowing for more thorough contact and better mixing of the reagents and wastewater. The small amount of solids produced in the initial reaction within the two pipe mixers is carried away by the water flow and enters the main reactor.

[0035] Optionally, the main reactor 3 is cylindrical and has an overflow trough 14 and a water outlet pipe 15 at the top. The water produced after mud-water separation by the inclined tube separation section 9 is discharged from the main reactor 3 through the overflow trough 14 and the water outlet pipe 15.

[0036] The inclined tube separation section 9 is a conventional device, consisting of several inclined tubes and supports. The inclined tubes are parallel to each other and are fixed to the upper part of the main reactor 3 by the supports.

[0037] Optionally, the bottom of the main reactor 3 has an inclined bottom surface, the edge of the bottom surface of the main reactor 3 is higher than the center of the bottom surface, and a sludge discharge port is provided at the center of the bottom surface. The sludge discharge port is connected to a sludge treatment device through a pipe for treating the sludge obtained from the main reactor 3.

[0038] Optionally, both the inner cylinder 11 and the outer cylinder 12 are cylindrical and concentrically arranged. The outlet of the water inlet pipe 13 is located in the lower middle part of the inner cylinder 11. A circular dosing ring 16 is provided above the outlet of the water inlet pipe 13. The dosing ring 16 is concentrically arranged with the inner cylinder 11. The dosing ring 16 is connected to the flocculant dosing device 7 through a pipeline.

[0039] The bottom of the inner cylinder 11 is open, and a dispersion hood 18 is provided below the inner cylinder 11. The dispersion hood 18 is conical, and a first motor 19 is provided at the top inside the dispersion hood 18 to connect to and drive the sludge scraper 10 to rotate. The bottom of the outer cylinder 12 corresponds to the inclined side of the dispersion hood 18, but does not contact the inclined side, so that the water flowing out of the inner cylinder 11 and the outer cylinder 12 enters other parts of the main reactor 3 after being dispersed by the dispersion hood 18 for sludge-water separation. The large solid particles settled in the inner cylinder 11 (excluding the hardened solids) slide down the dispersion hood to the bottom of the main reactor.

[0040] Water carrying chemicals from the two pipe mixers enters the inner cylinder 11 and flows upwards. Upon encountering the flocculant added by the dosing ring 16, the water mixes with various chemicals, removing hardness and contaminants. Heavier solids settle out from the bottom of the inner cylinder, while lighter, smaller flocs flow from the top of the inner cylinder 11 into the outer cylinder 12, continuing to flow downwards while the reaction continues. Upon reaching the bottom of the outer cylinder 12, the water diffuses outwards towards the enhanced reaction section 8. The dispersion hood 18 is tilted, allowing the water and chemicals discharged from the outer cylinder 12 to be dispersed more evenly into other areas of the main reactor 3.

[0041] Optionally, the flocculant dosing device 7 includes a fourth tank containing a flocculant solution. The fourth tank is connected to the dosing ring 16 via a corresponding pump and control valve, so that the inlet water of the main reactor 3 and the flocculant solution are mixed in the inner cylinder 11.

[0042] Optionally, the first motor 19 is a dual-axis motor, with the inner axis pointing upwards and the outer axis pointing downwards. A vertical first stirring shaft 21 is provided at the center of the sludge scraper 10. The top end of the first stirring shaft 21 is connected to the outer shaft of the first motor 19, thereby driving the sludge scraper 10 to rotate and driving the sludge at the bottom of the main reactor to move towards the center of the bottom surface.

[0043] Optionally, a closed cavity 24 is provided below the top of the dispersion cover 18 for placing the first motor 19 to prevent external water from affecting the first motor 19. The outer shaft of the first motor 19 extends out of the bottom surface of the closed cavity 24, and the inner shaft of the first motor 19 extends out of the top of the dispersion cover and into the inner cylinder. Sealing rings are provided at the positions where the two shafts extend out of the closed cavity 24 to prevent water leakage.

[0044] Optionally, the inner cylinder 11 is provided with a spiral stirrer 25, which includes spiral blades and a vertical second stirring shaft 22. The bottom end of the second stirring shaft 22 is connected to the inner shaft of the first motor 19, thereby driving the spiral stirrer 25 to rotate. The inner side of the spiral blades is fixedly connected to the second stirring shaft 22, and the outer side extends into the inner cylinder 11 and has a gap with the inner wall of the inner cylinder 11, so as not to affect the rotation of the spiral stirrer 25.

[0045] The spiral blades are spirally arranged along the length of the second stirring shaft 22 and uniformly around the circumference of the inner cylinder 11, and the diameter of the spiral blades gradually increases from bottom to top.

[0046] Further optionally, the ratio of the diameter at the bottom to the diameter at the top of the helical blade is 1:(2-5);

[0047] The inner wall of the inner cylinder 11 and the surface of the spiral blades are both smooth surfaces to avoid the generation of too many air bubbles in the water inside the inner cylinder 11.

[0048] In the water within the inner cylinder 11, under the influence of various agents, bubbles are generated in a traditional free cavity (i.e., without a stirring device) or a stirred environment. These bubbles adhere to the surface of newly formed small flocs, causing them to rise to the water surface and preventing them from growing further, thus reducing the coagulation and flocculation effect. In this invention, the inner wall of the inner cylinder 11 and the surface of the spiral blades are both smooth, providing a stable environment for the water and reducing bubble generation while promoting water turbulence.

[0049] The dosing ring 16 is fitted around the outside of the spiral agitator 25 without affecting its rotation. The spiral agitator 25 promotes the mixing and reaction of the water and chemicals inside the inner cylinder 11, and also promotes the uniform upward rotation and upward flow of the water. This stable flow pattern allows small flocs to continue attaching to other flocs and grow into large flocs, which is beneficial for subsequent settling in the outer cylinder 12 and the main reactor 3. Meanwhile, the heavier solid waste in the inner cylinder naturally settles down and is discharged from the inner cylinder.

[0050] Optionally, the top of the inner cylinder 11 is provided with a funnel-shaped overflow sidewall 26, the bottom of the overflow sidewall 26 is connected to the top of the sidewall of the inner cylinder 11, the top of the overflow sidewall 26 is higher than the liquid surface of the inner cylinder 11, and the overflow sidewall 26 is inclined outward to form an inverted frustum shape.

[0051] The overflow sidewall 26 is equipped with a rotating defoamer 27. The rotating defoamer 27 includes a circular wheel 28 and a vertical third stirring shaft 23. The wheel 28 is placed horizontally and is wave-shaped, that is, there are several peaks and troughs along the circumference of the wheel 28. The peaks and troughs are arranged alternately to form a peak-trough-peak-trough arrangement. The middle part of the wheel 28 is close to or flush with the liquid surface of the inner cylinder 11.

[0052] A second motor 20 is provided at or above the top of the main reactor 3. The shaft of the second motor 20 is connected to the top of the third stirring shaft 23, thereby driving the wheel 28 to rotate.

[0053] Further optionally, the number of crests on the wheel 28 is equal to the number of troughs, the height of the highest crest is equal to the depth of the lowest trough, the width of the widest part at the bottom of the crest is equal to the width of the widest part at the top of the trough; the vertical line corresponding to the highest point of the crest is the central axis of the crest, and there is a trough between the two closest crests.

[0054] The water in the inner cylinder 11 rises to the top, and the surface contains some flocculent material with air bubbles. The overflow sidewall 26 and the rotating defoamer 27 help eliminate these air bubbles. The third stirring shaft 23 drives the wheel 28 to rotate. The troughs of the waves cause the water and flocculent material to rotate and flow to the crests, causing the air bubbles to be exposed and burst, thus achieving the purpose of defoaming. When the wheel 28 rotates, it creates a pushing effect on the water surface, causing the water to form waves. The waves then rise along the overflow sidewall 26 and finally overflow from the overflow sidewall 26 into the outer cylinder 12. Therefore, the overflow from the inner cylinder 11 to the outer cylinder 12 of this invention is not a traditional overflow form. Instead, under the rotation of the defoamer 27, the wheel 28 pushes the liquid surface of the inner cylinder 11. The water waves impact the overflow sidewall 26 under the pushing action and then overflow to the outer cylinder 12. This type of overflow can form a wave-like water flow on the overflow sidewall 26. The flocs with bubbles have the opportunity to be exposed to the air, causing the bubbles to burst. The waves themselves can also break some bubbles when they impact the overflow sidewall 26.

[0055] Optionally, the outer cylinder 12 is provided with a plurality of spiral turbulence cages 29, which are evenly arranged along the circumference of the outer cylinder 12. The spiral turbulence cages 29 are arranged vertically, and the number of spiral turbulence cages 29 is equal to the number of wave peaks on the wheel 28. The distance between the central axes of two adjacent spiral turbulence cages 29 is equal to the distance between the central axes of the two closest wave peaks on the wheel 28.

[0056] The spiral turbulence-inducing net cage 29 comprises two spiral hollow net cages 17, both of which are open at the top and bottom, allowing water to flow through them and spirally intertwine with each other in the same direction (clockwise or counterclockwise). The cross-sectional size of the spiral turbulence-inducing net cage 29 is adjusted according to the actual water flow rate in the outer cylinder 12.

[0057] Further optionally, the top of the spiral turbulence cage 29 is slightly lower than the liquid level inside the outer cylinder 12, and the bottom of the spiral turbulence cage 29 extends out of the outer cylinder 12 and above the inclined side of the dispersion hood 18, which is beneficial to guide the water out of the outer cylinder 12 to the dispersion hood 18, and then disperse it to other areas of the main reactor 3 by the dispersion hood 18.

[0058] The water and chemicals overflowing from the overflow sidewall 26 into the outer cylinder 12 continue to react. Small flocs in the water continue to grow, further coagulating, flocculating, and removing hardness. The water flows downwards along the spiral turbulence net cage 29. Some water flows down the spiral of the hollow net cage, while some detaches from the hollow net cage midway and flows out, and some flows into the hollow net cage midway. The mesh sidewall of the spiral turbulence net cage 29 can attach to flocs, forming loaded crystal nuclei, which continue to attach and capture flocs, causing them to grow. Once the flocs are large enough, they detach from the spiral turbulence net cage 29 under gravity and settle onto the sidewall of the dispersion hood 18. Therefore, the spiral turbulence net cage 29 not only disturbs the water, promoting a full reaction between the water and chemicals, but also facilitates the capture and cultivation of flocs, leading to rapid floc growth and the initial removal of solid pollutants from the water.

[0059] Most of the water effluent from the outer cylinder 12 is guided by the spiral turbulence net cage 29 to the side of the dispersion hood 18, which enables the water flow to be evenly dispersed and enter other areas of the main reactor 3.

[0060] Optionally, several spiral turbulence cages are provided below the inclined tube separation section 9. The structure of the spiral turbulence cages is the same as that of the spiral turbulence cage 29, except that the central axis of the spiral turbulence cages is horizontal, and both ends of the hollow cages of the spiral turbulence cages are closed. One end of the spiral turbulence cages is connected to the first stirring shaft 21 through a connecting rod, and the other end extends outward from the main reactor 3. Several spiral turbulence cages are arranged radially and uniformly along the circumference of the main reactor 3. The first stirring shaft 21 can simultaneously drive several spiral turbulence cages to rotate, driving the mixed mud and water to flow upward, while capturing, collecting, and cultivating solid sediments, reducing the load on the inclined tube separation section 9.

[0061] This invention provides primary physicochemical treatment for power plant makeup water, reducing water hardness and removing suspended solids and other pollutants. The treated water can then undergo subsequent desalination. Due to the reduced water hardness, it is more compatible with subsequent membrane materials, improving membrane lifespan or extending the membrane treatment cycle.

Claims

1. A treatment device for boiler feedwater in power plants, characterized in that, It includes a first pipeline mixer, a second pipeline mixer and a main reactor connected in sequence. The first pipeline mixer is connected to a first alkaline dosing device, and the second pipeline mixer is connected to a second alkaline dosing device and a coagulant dosing device. The main reactor includes an enhanced reaction section, an inclined tube separation section, and a sludge scraper. The enhanced reaction section is located in the upper middle part and center of the main reactor. The enhanced reaction section has a sleeve structure, including an inner cylinder and an outer cylinder. A second pipeline mixer is connected to the inside of the inner cylinder through an inlet pipe to feed water into the inner cylinder. A flocculant dosing device is connected to the inside of the inner cylinder through a pipeline. The top of the inner cylinder is open and connects to the internal space of the outer cylinder. The top of the outer cylinder is higher than the liquid level of the main reactor, and the bottom of the outer cylinder is open, so that the water entering the inner cylinder flows through the inner cylinder and the outer cylinder in sequence before being discharged into the main reactor. An inclined tube separation section is provided on the outside of the enhanced reaction section. The inclined tube separation section is located above the main reactor. The sludge scraper can rotate to promote sludge discharge from the bottom of the main reactor. The bottom of the inner cylinder is open, and a dispersion hood is provided below the inner cylinder. The dispersion hood is conical, and a first motor is provided at the top inside the dispersion hood to connect to and drive the sludge scraper to rotate. The bottom of the outer cylinder corresponds to the inclined side of the dispersion hood, but does not contact the inclined side, so that the water flowing out of the inner cylinder and the outer cylinder enters other parts of the main reactor after being dispersed by the dispersion hood. Large solid particles settled in the inner cylinder slide down the dispersion hood to the bottom of the main reactor. The top of the inner cylinder is provided with a funnel-shaped overflow sidewall. The bottom of the overflow sidewall is connected to the top of the inner cylinder sidewall. The top of the overflow sidewall is higher than the liquid level in the inner cylinder. The overflow sidewall is inclined outward to form an inverted frustum shape. A rotating defoamer is installed inside the overflow sidewall. The rotating defoamer includes a circular wheel and a vertical third stirring shaft. The wheel is placed horizontally and is wavy. Several peaks and troughs are arranged along the circumference of the wheel, and the peaks and troughs are arranged alternately. The middle part of the wheel is close to or flush with the liquid surface of the inner cylinder. A second motor is installed at the top or above the main reactor. The shaft of the second motor is connected to the top of the third stirring shaft, thereby driving the wheel to rotate. The outer cylinder is provided with a number of spiral turbulence cages, which are evenly arranged along the circumference of the outer cylinder. The spiral turbulence cages are arranged vertically, and the number of spiral turbulence cages is equal to the number of wave peaks on the wheel. The spiral turbulence cage consists of two spiral hollow cages, with the top and bottom of the hollow cages being open to allow water to flow through them and spirally intertwine with each other in the same direction. The bottom of the spiral turbulence cage extends out of the outer cylinder and above the inclined side of the dispersion hood, which helps to guide the water effluent from the outer cylinder to the dispersion hood, and then disperse it to other areas of the main reactor.

2. The treatment device for boiler feedwater in power plants according to claim 1, characterized in that, The main reactor is cylindrical and has an overflow trough and an outlet pipe at the top. The bottom of the main reactor has an inclined bottom surface, and the edge of the bottom surface is higher than the center of the bottom surface. A sludge discharge port is located at the center of the bottom surface. The sludge discharge port is connected to a sludge treatment device through a pipe to treat the sludge obtained from the main reactor.

3. The treatment device for boiler feedwater in power plants according to claim 2, characterized in that, Both the inner and outer cylinders are cylindrical and concentrically arranged. The outlet of the water inlet pipe is located in the lower middle part of the inner cylinder. Above the outlet of the water inlet pipe is a circular dosing ring. The dosing ring is concentrically arranged with the inner cylinder and is connected to the flocculant dosing device through a pipeline.

4. The treatment device for boiler feedwater in power plants according to claim 3, characterized in that, The first motor is a dual-shaft motor, with the inner shaft pointing upwards and the outer shaft pointing downwards. A vertical first stirring shaft is located at the center of the sludge scraper, and the top of the first stirring shaft is connected to the outer shaft of the first motor, thereby driving the sludge scraper to rotate and driving the sludge at the bottom of the main reactor to move towards the center of the bottom surface.

5. The treatment device for power plant boiler feedwater source according to claim 4, characterized in that, The inner cylinder is equipped with a spiral stirrer, which includes spiral blades and a vertical second stirring shaft. The bottom end of the second stirring shaft is connected to the upward shaft of the first motor, thereby driving the spiral stirrer to rotate. The inner side of the spiral blades is fixedly connected to the second stirring shaft, and the outer side extends into the inner cylinder and has a gap with the inner wall of the inner cylinder, so as not to affect the rotation of the spiral stirrer. The spiral blades are spirally arranged along the length of the second stirring shaft and uniformly around the circumference of the inner cylinder, and the diameter of the spiral blades gradually increases from bottom to top; The inner wall of the inner cylinder and the surface of the spiral blades are both smooth surfaces to prevent the formation of excessive air bubbles in the water inside the inner cylinder.

6. The treatment device for boiler feedwater in power plants according to claim 3, characterized in that, The number of crests on the wheel is equal to the number of troughs, the height of the highest crest is equal to the depth of the lowest trough, and the width of the widest part at the bottom of the crest is equal to the width of the widest part at the top of the trough. The vertical line corresponding to the highest point of the wave crest is the central axis of the wave crest, and there is a trough between the two closest wave crests.

7. The treatment device for boiler feedwater in power plants according to claim 1, characterized in that, The first pipeline mixer includes two inlets and one outlet. One inlet is used to input the raw water to be treated, the other inlet is connected to the first alkaline dosing device, and the outlet is connected to one inlet of the second pipeline mixer via a pipeline.

8. The treatment device for boiler feedwater in power plants according to claim 1, characterized in that, The second pipeline mixer includes three inlets and one outlet. One inlet is connected to the outlet of the first pipeline mixer, another inlet is connected to the second alkaline dosing device, and yet another inlet is connected to the coagulant dosing device. The outlet is connected to the inside of the inner cylinder through an inlet pipe.

9. The treatment device for boiler feedwater in power plants according to claim 1, characterized in that, The first alkaline dosing device includes a first chemical tank containing lime slurry or liquid alkali. The first chemical tank is connected to a first pipeline mixer via a corresponding pump and control valve, so that the raw water is mixed with lime slurry or liquid alkali in the first pipeline mixer. The second alkaline dosing device includes a second tank containing a soda ash solution; the coagulant dosing device includes a third tank containing a conventional coagulant solution. The second and third medicine tanks are connected to the second pipeline mixer via their respective pumps and control valves, so that the water discharged from the first pipeline mixer is then mixed with the soda ash solution and coagulant.

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