Treatment device for power plant boiler make-up water source

Abstract

The invention relates to a power plant boiler make-up water source treatment device which comprises a first pipeline mixer, a second pipeline mixer and a main reactor which are sequentially connected, the first pipeline mixer is connected with a first alkaline dosing device, and the second pipeline mixer is connected with a second alkaline dosing device and a coagulant dosing device; the main reactor internally comprises an enhanced reaction part, an inclined tube separation part and a sludge scraper, the enhanced reaction part is located at 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 into the inner cylinder through a water inlet pipe, and the flocculant dosing device is connected into the inner cylinder through a pipeline; the top of the inner cylinder is open and communicated with the inner 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 inlet water of the inner cylinder sequentially flows through the inner cylinder and the outer cylinder; an inclined tube separation part is arranged on the outer side of the enhanced reaction part and is positioned at 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] The invention belongs to the technical field of water treatment, and in particular relates to a treatment device for a boiler feed water source of a power plant. Background Art

[0002] In the past, the make-up water for power plant boilers was groundwater. In order to save water, the make-up water now mostly uses recycled sewage, urban water, reservoir water, etc. There are the following problems with the use of surface recycled water resources: this water source contains pollutants such as calcium ions, magnesium ions, and silica, and has the characteristics of high salt content, high hardness, and high suspended matter.

[0003] At present, the treatment of boiler feed water in power plants can be divided into three levels: primary physicochemical pretreatment (conventionally using mechanical accelerated clarification tanks, high-density sedimentation, variable pore filters, V-type filters and other processes), secondary pre-desalting treatment (conventionally using ultrafiltration + reverse osmosis and other processes), and tertiary deep desalting treatment (conventionally using secondary reverse osmosis + EDI and other processes). However, for the primary pretreatment process, the effect of removing hardness and suspended solids is not good when using mechanical accelerated clarification tanks. The main reason is that the mixing of chemicals and wastewater is uneven, and the sludge sedimentation effect in the sedimentation area is not good. The treatment effect of this technology is not ideal. The use of high-density sedimentation tanks has the problem of large dosage of chemicals and large sludge production. At the same time, there is a problem of sludge collection in the coagulation area and flocculation tank. In addition, the content of pollutants such as hardness and suspended solids in the wastewater after primary physicochemical pretreatment is still very high, which cannot meet the needs of stable operation of the subsequent treatment system. Summary of the invention

[0004] In view of the above problems, the present invention provides a treatment device for a boiler feed water source of a power plant, comprising a first pipeline mixer, a second pipeline mixer and a main reactor connected in sequence, the first pipeline mixer being connected to a first alkaline dosing device, and the second pipeline mixer being connected to a second alkaline dosing device and a coagulant dosing device;

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

[0006] An oblique tube separation part is arranged on the outer side of the enhanced reaction part, and the oblique tube separation part is located on the upper part of the main reactor. The sludge scraper can rotate to promote the sludge discharge at the bottom of the main reactor.

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

[0008] Optionally, the first alkaline dosing device includes a first medicine box, which is filled with lime milk or liquid alkali. The first medicine box is connected to a first pipeline mixer through a corresponding pump and a control valve, so that raw water and lime milk or liquid alkali are mixed 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 another inlet is connected to the coagulant dosing device, and the outlet is connected to the interior of the inner cylinder through a water inlet pipe.

[0010] Optionally, the second alkaline dosing device includes a second medicine box, in which a soda solution is contained; the coagulant dosing device includes a third medicine box, in which a conventional coagulant solution is contained;

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

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

[0013] Optionally, the inner cylinder and the outer cylinder are both cylindrical and concentrically arranged, the water outlet of the water inlet pipe is located in the middle and lower part of the inner cylinder, a circular dosing ring is arranged above the water outlet of the water inlet pipe, the dosing ring is concentrically arranged with the inner cylinder, and 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 on the top of the dispersion hood for connecting and driving the sludge scraper to rotate; the bottom of the outer cylinder corresponds to the inclined side of the dispersion hood and does not contact the inclined side, so that the water flowing out of the inner cylinder and the outer cylinder passes through the dispersion effect of the dispersion hood and then enters other parts of the main reactor, and the large particles of solid settled in the inner cylinder slide along the dispersion hood to the bottom of the main reactor.

[0015] Further optionally, the first motor is a dual-shaft motor with an inner shaft pointing upward and an outer shaft pointing downward. A vertical first stirring shaft is provided at the center of the sludge scraper. 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 toward the center of the bottom surface.

[0016] Further optionally, a spiral stirrer is provided inside the inner cylinder, the spiral stirrer comprises a spiral blade 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 blade 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, which does not affect the rotation of the spiral stirrer;

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

[0018] Further optionally, the inner wall of the inner cylinder and the surface of the spiral blades are both smooth surfaces to avoid the generation of a large number of bubbles in the water body of the inner cylinder.

[0019] Optionally, a trumpet-shaped overflow side wall is provided at the top of the inner cylinder, the bottom of the overflow side wall is connected to the top of the inner cylinder side wall, the top of the overflow side wall is higher than the liquid level of the inner cylinder, and the overflow side wall is tilted outward as a whole to form an inverted truncated cone shape;

[0020] A rotating defoamer is arranged inside the overflow side wall, and the rotating defoamer comprises a circular wheel disc and a vertical third stirring shaft. The wheel disc is placed horizontally as a whole, and is in a wave shape, that is, a plurality of crests and troughs are arranged along the circumference of the wheel disc, and the crests and troughs are arranged alternately in sequence to form a crest, trough, crest, trough arrangement, and the middle of the wheel disc is close to or flush with the liquid surface of the inner cylinder;

[0021] A second motor is arranged on or above the top of the main reactor, and a rotating shaft of the second motor is connected to the top of the third stirring shaft, thereby driving the wheel disc to rotate.

[0022] Further optionally, the number of peaks on the wheel is equal to the number of troughs, the height of the highest peak is equal to the depth of the lowest trough, the width of the widest part of the bottom of the peak is equal to the width of the widest part of the top of the trough; the vertical line corresponding to the highest peak is the central axis of the peak, and there is a trough between the two nearest peaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the processing device for the boiler feed water source of the power plant;

[0024] Figure 2 Schematic diagram of the enhanced reaction section and dispersion cover.

[0025] In the accompanying drawings, 1-the first pipeline mixer, 2-the second pipeline mixer, 3-the main reactor, 4-the first alkaline dosing device, 5-the second alkaline dosing device, 6-the coagulant dosing device, 7-the flocculant dosing device, 8-the enhanced reaction part, 9-the inclined tube separation part, 10-the sludge scraper, 11-the inner cylinder, 12-the outer cylinder, 13-the water inlet pipe, 14-the overflow trough, 15-the water outlet pipe, 16-the dosing ring, 17-the hollow mesh cage, 18-the dispersion cover, 19-the first motor, 20-the second motor, 21-the first stirring shaft, 22-the second stirring shaft, 23-the third stirring shaft, 24-the closed chamber, 25-the spiral agitator, 26-the overflow side wall, 27-the rotating defoamer, 28-the wheel, 29-the spiral spoiler mesh cage one. DETAILED DESCRIPTION

[0026] This embodiment provides a processing device for a boiler feed water source of a power plant, such as Figure 1-Figure 2 As shown, it comprises a first pipeline mixer 1, a second pipeline mixer 2 and a main reactor 3 which are 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 part 8, an oblique tube separation part 9 and a sludge scraper 10. The enhanced reaction part 8 is located in the middle and upper part of the main reactor 3 and in the center of the main reactor 3. The enhanced reaction part 8 is a sleeve structure, including an inner tube 11 and an outer tube 12. The second pipeline mixer 2 is connected to the inner tube 11 through a water inlet pipe 13 to feed water into the inner tube 11. The flocculant dosing device 7 is connected to the inner tube 11 through a pipeline. The top of the inner tube 11 is open and connected to the internal space of the outer tube 12. The top of the outer tube 12 is higher than the liquid level of the main reactor 3. The bottom of the outer tube 12 is open, so that the water in the inner tube 11 flows through the inner tube 11 and the outer tube 12 in sequence, and then is discharged into the main reactor 3.

[0028] An oblique tube separation section 9 is provided on the outer side of the enhanced reaction section 8 . The oblique tube separation section 9 is located at the upper part of the main reactor 3 . The sludge scraper 10 can rotate to promote sludge discharge at 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 raw water to be treated, the other inlet is connected to the first alkaline dosing device 4, and the outlet is connected to an inlet of the second pipeline mixer 2 through a pipeline.

[0030] Optionally, the first alkaline dosing device 4 includes a first medicine box, which is filled with lime milk or liquid alkali. The first medicine box is connected to the first pipeline mixer 1 through a corresponding pump and a control valve, so that the raw water is mixed with the lime milk 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 another inlet is connected to the coagulant dosing device 6, and the outlet is connected to the interior of the inner tube 11 through the water inlet pipe 13.

[0032] Optionally, the second alkaline dosing device 5 includes a second medicine box, in which a soda ash solution is contained; the coagulant dosing device 6 includes a third medicine box, in which a conventional coagulant solution is contained;

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

[0034] The present invention adopts the double alkali method to remove hardness (lime / sodium hydroxide, soda ash), and the lime milk or liquid alkali, soda ash solution, and coagulant are mixed through the front and rear two pipeline mixers, so that the reagent and wastewater can be in contact more fully and the mixing effect is better. The small amount of solids produced by the initial reaction in the two pipeline mixers can be carried away by the water flow under the action of the water flow impact in the two pipeline mixers and enter the main reactor.

[0035] Optionally, the main reactor 3 is cylindrical, and an overflow trough 14 and a water outlet pipe 15 are provided on the top, and the produced water after the mud and water separation in the inclined tube separation part 9 is discharged from the main reactor 3 through the overflow trough 14 and the water outlet pipe 15;

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

[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, a mud discharge port is provided in the center of the bottom surface, and the mud discharge port is connected to a sludge treatment device through a pipeline for treating the sludge obtained from the main reactor 3.

[0038] Optionally, the inner cylinder 11 and the outer cylinder 12 are both cylindrical and concentrically arranged, the water outlet of the water inlet pipe 13 is located in the middle and lower part of the inner cylinder 11, and a circular dosing ring 16 is provided above the water outlet of the water inlet pipe 13. The dosing ring 16 is concentrically arranged with the inner cylinder 11, and 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 of the dispersion hood 18 for connecting and driving the sludge scraper 10 to rotate; the bottom of the outer cylinder 12 corresponds to the inclined side of the dispersion hood 18 and does not contact the inclined side, so that the water flowing out of the inner cylinder 11 and the outer cylinder 12 passes through the dispersion hood 18 and then enters other parts of the main reactor 3 for mud and water separation, and the large particles of solids settled in the inner cylinder 11 (solids obtained except hardness) slide along the dispersion hood to the bottom of the main reactor.

[0040] The water body carrying the reagents through the two pipeline mixers enters the inner cylinder 11 and flows upward. When it encounters the flocculant added by the dosing ring 16, the water body is mixed with a variety of reagents to remove hardness and pollutants. The solid waste with a larger specific gravity in the water settles out from the bottom of the inner cylinder. The water body carries the lighter and smaller flocs and flows from the top of the inner cylinder 11 to the inside of the outer cylinder 12, and continues to flow from top to bottom. The reaction is still in progress while flowing. When the water body flows to the bottom of the outer cylinder 12, it diffuses to the outside of the enhanced reaction part 8. The side of the dispersion cover 18 is inclined, and the water body and reagents discharged from the outer cylinder 12 can enter other areas of the main reactor 3 more evenly through the dispersion effect of the side of the dispersion cover 18.

[0041] Further optionally, the flocculant dosing device 7 includes a fourth medicine box, which contains a flocculant solution. The fourth medicine box is connected to the dosing ring 16 via a corresponding pump and a control valve, so that the influent water of the main reactor 3 is mixed with the flocculant solution in the inner tube 11.

[0042] Further optionally, the first motor 19 is a dual-shaft motor with the inner shaft pointing upward and the outer shaft pointing downward. A vertical first stirring shaft 21 is provided at the center of the sludge scraper 10. The top 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 toward the center of the bottom surface.

[0043] Further 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 passes through the bottom surface of the closed cavity 24, and the inner shaft of the first motor 19 passes through the top of the dispersion cover and extends into the inner cylinder, and sealing rings are provided at the positions where the two shafts pass through the closed cavity 24 to prevent water leakage.

[0044] Further optionally, a spiral stirrer 25 is provided inside the inner cylinder 11, and the spiral stirrer 25 includes a spiral blade and a vertical second stirring shaft 22, and 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 blade 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, which does not affect the rotation of the spiral stirrer 25;

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

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

[0047] The inner wall of the inner cylinder 11 and the surface of the spiral blades are both smooth surfaces, which prevents the generation of many bubbles in the water body of the inner cylinder 11.

[0048] Under the action of various agents, the water in the inner cylinder 11 will generate bubbles in a traditional free cavity (i.e., without a stirring device) or a stirring environment. The bubbles adhere to the surface of the newly generated small-volume flocs, driving the small flocs to rise to the water surface, and the small flocs cannot continue to grow, resulting in a decrease in the coagulation and flocculation effect. The inner wall of the inner cylinder 11 and the surface of the spiral blades of the present invention are both smooth surfaces, providing a stable environment for the water body, while promoting water disturbance, can reduce the generation of bubbles.

[0049] The dosing ring 16 is sleeved on the outside of the spiral stirrer 25 and does not affect the rotation of the spiral stirrer 25. The spiral stirrer 25 can not only promote the mixing and reaction of the water body and the reagent inside the inner cylinder 11, but also promote the overall uniform and rotating upward movement of the water body. This stable flow form of the water body is conducive to the small flocs continuing to attach to other flocs and grow, and finally forming large flocs, which is conducive to the subsequent sedimentation in the outer cylinder 12 and the main reactor 3. The solid waste with a larger specific gravity in the inner cylinder naturally settles down and is discharged from the inner cylinder.

[0050] Optionally, a trumpet-shaped overflow side wall 26 is provided at the top of the inner cylinder 11, the bottom of the overflow side wall 26 is connected to the top of the side wall of the inner cylinder 11, the top of the overflow side wall 26 is higher than the liquid level of the inner cylinder 11, and the overflow side wall 26 is tilted outward as a whole to form an inverted truncated cone shape;

[0051] A rotating defoamer 27 is provided inside the overflow side wall 26. The rotating defoamer 27 includes a circular wheel disc 28 and a vertical third stirring shaft 23. The wheel disc 28 is placed horizontally as a whole. The wheel disc 28 is wavy, that is, a plurality of crests and troughs are provided along the circumference of the wheel disc 28. The crests and troughs are alternately arranged in sequence to form a crest, trough, crest, trough arrangement. The middle of the wheel disc 28 is close to or flush with the liquid surface of the inner cylinder 11.

[0052] A second motor 20 is disposed on or above the main reactor 3 , and a rotating 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 peaks on the wheel 28 is equal to the number of troughs, the height of the highest peak is equal to the depth of the lowest trough, the width of the widest part of the bottom of the peak is equal to the width of the widest part of the top of the trough; the vertical line corresponding to the highest point of the peak is the central axis of the peak, and there is a trough between the two nearest peaks.

[0054] The water in the inner cylinder 11 rises to the top, and the liquid surface carries some flocs with bubbles. The overflow side wall 26 and the rotating defoamer 27 help to eliminate these bubbles. The third stirring shaft 23 drives the wheel 28 to rotate, and the wave trough drives the water and flocs to rotate and flow to the wave crest position, causing the bubbles to leak into the air, causing the bubbles to burst, and achieving the purpose of defoaming. When the wheel 28 rotates, it produces an effect of pushing water waves on the liquid surface, causing the water to form waves, and the waves then climb along the overflow side wall 26, and finally overflow from the overflow side wall 26 into the outer cylinder 12. Therefore, the overflow from the inner cylinder 11 to the outer cylinder 12 of the present invention is not a traditional overflow form, but under the rotation of the rotating defoamer 27, the wheel 28 pushes the liquid surface of the inner cylinder 11, and the water waves impact the overflow side wall 26 under the pushing action, and then overflow to the outer cylinder 12. This form of overflow can form a wave-like water flow on the overflow side wall 26, and the flocs with bubbles have the opportunity to be exposed to the air, causing the bubbles to burst. The wave itself can also break some bubbles when impacting the overflow side wall 26.

[0055] Optionally, a plurality of spiral spoiler mesh cages 29 are provided in the outer cylinder 12 and are evenly arranged along the circumference of the outer cylinder 12. The spiral spoiler mesh cages 29 are arranged vertically. The number of spiral spoiler mesh cages 29 is equal to the number of wave crests on the wheel disc 28. The spacing between the central axes of two adjacent spiral spoiler mesh cages 29 is equal to the spacing between the central axes of the two closest wave crests on the wheel disc 28.

[0056] The spiral spoiler mesh cage 29 includes two spiral hollow mesh cages 17, the top and bottom of the hollow mesh cages 17 are open, so that water flows through the hollow mesh cages and spirally entangles with each other in the same direction (clockwise or counterclockwise). The size of the cross section of the spiral spoiler mesh cage 29 is adjusted according to the actual water flow of the outer cylinder 12.

[0057] Further optionally, the top of the spiral spoiler cage 29 is slightly lower than the liquid level in the outer cylinder 12, and the bottom of the spiral spoiler cage 29 extends out of the outer cylinder 12 and extends to above the inclined side of the dispersion cover 18, which is beneficial for guiding the water outlet of the outer cylinder 12 to the dispersion cover 18, and then dispersed by the dispersion cover 18 to other areas of the main reactor 3.

[0058] The water overflowing from the overflow side wall 26 into the outer cylinder 12 continues to react with the reagent, and the small flocs in the water continue to grow, and continue to coagulate, flocculate, and remove hardness. The water flows from top to bottom along the spiral flow-turbine cage 29, and part of the water flows down along the hollow cage spiral, and some of the water detaches from the hollow cage midway and flows out, and some of the water flows into the hollow cage midway. The mesh side wall of the spiral flow-turbine cage 29 can attach the flocs to form a load-type crystal nucleus, and continue to attach and capture the flocs, thereby growing. When the flocs have a large mass, they detach from the spiral flow-turbine cage 29 under the action of gravity and settle on the side wall of the dispersion cover 18. Therefore, the spiral flow-turbine cage 29 can not only play the role of disturbing the water, promote the full reaction of the water and the reagent, but also facilitate the capture and cultivation of flocs, and the flocs grow rapidly, and the solid pollutants in the water are initially removed.

[0059] Most of the water output from the outer cylinder 12 is guided to the side of the dispersion hood 18 by the spiral turbulent mesh cage 29. The dispersion hood 18 can evenly disperse the water flow and enter other areas of the main reactor 3.

[0060] Optionally, a plurality of spiral spoiler cages 2 are provided below the inclined tube separation portion 9, and the structure of the spiral spoiler cages 2 is the same as that of the spiral spoiler cages 1 29, except that the central axis of the spiral spoiler cages 2 is horizontal, and the left and right ends of the hollow cage of the spiral spoiler cages 2 are closed, one end of the spiral spoiler cages 2 is connected to the first stirring shaft 21 through a connecting rod, and the other end extends toward the outside of the main reactor 3, and a plurality of spiral spoiler cages 2 are evenly arranged radially along the circumference of the main reactor 3, and the first stirring shaft 21 can simultaneously drive a plurality of spiral spoiler cages 2 to rotate, driving the mixed mud and water to flow upward, while capturing, collecting and cultivating solid sediment, thereby reducing the load on the inclined tube separation portion 9.

[0061] The present invention performs primary physical and chemical treatment on the power plant feed water source, reduces the hardness of the water source, removes suspended matter and other pollutants, and the produced water after the treatment of the present invention can be subjected to subsequent desalination treatment. Due to the reduction in water hardness, it is more friendly to subsequent membrane materials, thereby increasing the service life of the membrane or extending the membrane treatment cycle.

Claims

1. A treatment device for boiler feed water source of power plant, It is characterized in that It comprises a first pipeline mixer, a second pipeline mixer and a main reactor which are 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 part, an inclined tube separation part and a sludge scraper. The enhanced reaction part is located in the upper middle part of the main reactor and in the center of the main reactor. The enhanced reaction part is a sleeve structure, including an inner tube and an outer tube. The second pipeline mixer is connected to the inner tube through a water inlet pipe to feed water into the inner tube. The flocculant dosing device is connected to the inner tube through a pipeline. The top of the inner tube is open and connected to the internal space of the outer tube. The top of the outer tube is higher than the liquid level of the main reactor. The bottom of the outer tube is open, so that the water in the inner tube flows through the inner tube and the outer tube in sequence and then discharged into the main reactor. An oblique tube separation part is arranged on the outer side of the enhanced reaction part, and the oblique tube separation part is located at the upper part of the main reactor. The sludge scraper can rotate to promote the sludge discharge at the bottom of the main reactor.

2. The processing device for the boiler feed water source of a power plant according to claim 1, It is characterized in that The main reactor is cylindrical and has an overflow trough and a water outlet pipe on the top. The bottom of the main reactor has an inclined bottom surface. The edge of the bottom surface of the main reactor is higher than the center of the bottom surface. A mud discharge port is provided in the center of the bottom surface. The mud discharge port is connected to a sludge treatment device through a pipeline and is used to treat the sludge obtained from the main reactor.

3. The processing device for the boiler feed water source of a power plant according to claim 2, It is characterized in that The inner cylinder and the outer cylinder are both cylindrical and concentrically arranged. The water outlet of the water inlet pipe is located in the middle and lower part of the inner cylinder. A circular dosing ring is arranged above the water outlet of the water inlet pipe. The dosing ring is concentrically arranged with the inner cylinder and is connected to the flocculant dosing device through a pipeline. 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 on the top of the dispersion hood for connecting and driving the sludge scraper to rotate; the bottom of the outer cylinder corresponds to the inclined side of the dispersion hood and does not contact the inclined side, so that the water flowing out of the inner cylinder and the outer cylinder passes through the dispersion effect of the dispersion hood and then enters other parts of the main reactor, and the large particles of solid settled in the inner cylinder slide along the dispersion hood to the bottom of the main reactor.

4. The processing device for the boiler feed water source of a power plant according to claim 3, It is characterized in that The first motor is a double-shaft motor with the inner shaft pointing upward and the outer shaft pointing downward. A vertical first stirring shaft is provided in the center of the sludge scraper. 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 toward the center of the bottom surface.

5. The processing device for the boiler feed water source of a power plant according to claim 4, It is characterized in that A spiral stirrer is arranged inside the inner cylinder, and the spiral stirrer includes a spiral blade and a vertical second stirring shaft, and 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 blade 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, which does not affect the rotation of the spiral stirrer; The spiral blades are spirally arranged evenly along the length direction of the second stirring shaft and along the circumference of the inner cylinder, and the diameter of the spiral blades increases gradually from bottom to top; The inner wall of the inner cylinder and the surface of the spiral blades are both smooth surfaces, which prevents the generation of many bubbles in the water body of the inner cylinder.

6. The processing device for boiler feed water source of a power plant according to claim 3, It is characterized in that A trumpet-shaped overflow side wall is provided on the top of the inner cylinder, the bottom of the overflow side wall is connected to the top of the inner cylinder side wall, the top of the overflow side wall is higher than the liquid level of the inner cylinder, and the overflow side wall is tilted outward as a whole to form an inverted truncated cone shape; A rotating defoamer is arranged inside the overflow side wall, and the rotating defoamer comprises a circular wheel disc and a vertical third stirring shaft. The wheel disc is placed horizontally as a whole, and is in a wave shape, that is, a plurality of crests and troughs are arranged along the circumference of the wheel disc, and the crests and troughs are arranged alternately in sequence to form a crest, trough, crest, trough arrangement, and the middle of the wheel disc is close to or flush with the liquid surface of the inner cylinder; A second motor is arranged on or above the top of the main reactor, and a rotating shaft of the second motor is connected to the top of the third stirring shaft, thereby driving the wheel disc to rotate.

7. The processing device for the boiler feed water source of a power plant according to claim 6, It is 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 of the bottom of the crest is equal to the width of the widest part of 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 nearest crests.

8. The processing device for boiler feed water source of a power plant according to claim 1, It is characterized in that The first pipeline mixer comprises two inlets and one outlet, one inlet is used to input raw water to be treated, the other inlet is connected to the first alkaline dosing device, and the outlet is connected to an inlet of the second pipeline mixer through a pipeline.

9. The processing device for boiler feed water source of a power plant according to claim 1, It is 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 another inlet is connected to the coagulant dosing device. The outlet is connected to the inner tube through a water inlet pipe.

10. The processing device for boiler feed water source of a power plant according to claim 1, It is characterized in that The first alkaline dosing device comprises a first medicine box, in which lime milk or liquid alkali is contained, and the first medicine box is connected to a first pipeline mixer through a corresponding pump and a control valve, so that raw water and lime milk or liquid alkali are mixed in the first pipeline mixer; The second alkaline dosing device includes a second medicine box, which contains a soda solution; the coagulant dosing device includes a third medicine box, which contains a conventional coagulant solution; The second medicine box and the third medicine box are connected to the second pipeline mixer through their corresponding pumps and control valves, so that the water discharged from the first pipeline mixer is mixed with the soda ash solution and the coagulant.

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