A thermal power plant wastewater treatment device and method

Abstract

The present invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device and method for a thermal power plant, comprising a pressing unit, wherein a filter screen in an annular structure is arranged in the pressing unit; a decontamination unit in an annular structure is sleeved on the periphery of the filter screen, wherein the decontamination unit comprises a first annular shell fixedly sleeved on the periphery of the filter screen and a second annular shell sleeved on the periphery of the first annular shell, wherein the first annular shell and the second annular shell are connected to each other, wherein air blown toward the first annular shell passes through the second annular shell, wherein the first annular shell is used to collect moisture separated by the filter screen, wherein when the filter screen is in a filtering state, air in the second annular shell stops circulating, and after the filter screen completes filtering, the second annular shell blows air into the first annular shell, wherein the air entering the first annular shell passes through the filter screen and flows into the filter screen, wherein the present invention ensures the filtering effect of the filter screen and reduces the workload of the staff.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device and method for a thermal power plant. Background Art

[0002] The wastewater treatment device in the prior art directly adds limestone and sedimentation agent during use, which causes a portion of the limestone and sedimentation agent to easily settle at the bottom of the barrel, resulting in the wastewater being unable to fully react, reducing the effect of wastewater treatment and causing a certain amount of waste of resources.

[0003] Chinese patent CN221117129U discloses a wastewater treatment device for desulfurization and denitrification in a thermal power plant, including a bottom plate, a mixing barrel is fixedly installed on one side of the top of the bottom plate, a feed pipe is fixedly passed through the top of the mixing barrel, a filter is fixedly installed inside the feed pipe, a dust plug is arranged above the feed pipe, the dust plug is movably clamped in the feed pipe, a first connecting plate and a second connecting plate are arranged on the side above the mixing barrel away from the feed pipe, the bottom end of the second connecting plate is fixedly connected to the top of the mixing barrel, a first mixing rod is rotatably installed on the bottom end of the first connecting plate, the first mixing rod passes through the second connecting plate and the top of the mixing barrel, a first gear is fixedly sleeved on the outer side of the first mixing rod, two support rods are rotatably installed between the first connecting plate and the second connecting plate, and the outer fixed sleeve of the support rod is There is a first long gear, the first long gear is meshed with the first gear, the outer side fixed sleeve of the other support rod is provided with a second long gear, the second long gear is meshed with the first long gear, the top end of the second connecting plate is rotatably penetrated by a second mixing rod, the first mixing rod penetrates the second mixing rod, the outer side fixed sleeve of the second mixing rod is provided with a second gear, the second gear and the second long gear are meshed and connected, the outer bottoms of the second mixing rod and the first mixing rod are fixedly sleeved with mixing blades, and the two mixing blades are provided with evenly distributed empty grooves, a control valve is provided on the outer side of the mixing barrel, and a filter box is provided at the other end of the control valve, a cleaning pipe is fixedly penetrated at the top of the filter box, symmetrically distributed filter plates are fixedly installed inside the filter box, and a water outlet pipe is fixedly penetrated on the side of the filter box away from the control valve.

[0004] The above scheme improves the treatment effect of wastewater by stirring the mixing barrel and reduces the waste of resources. However, there are defects in the filtering process of the sediment in the wastewater in the above scheme. The filter screen in the above scheme cannot be cleaned by a cleaning brush on the side facing the feed inlet. Long-term use will inevitably cause the filter screen to be blocked, and then filtering cannot be performed. At the same time, long-term cleaning of the filter screen by a cleaning brush is likely to cause wear of the filter screen, which reduces the service life of the filter screen. The solid matter filtered through the filter screen cannot be discharged in time and needs to be cleaned manually. If blowing is used to blow off the impurities on the filter screen, the traditional method is to use a fan to blow around the filter screen, and the hair dryer needs to be driven separately by the drive unit, which makes the wastewater collection shell larger in volume. In order to ensure that the flowing airflow can fully cover the filter screen, a separate drive mechanism is required to drive the blowing unit to rotate around the filter screen. If the related lines of the driving mechanism fail, the blowing unit cannot rotate around the filter screen. This requires regular maintenance of the driving mechanism and increases the cost of use. Summary of the invention

[0005] In view of the above problems, a wastewater treatment device and method for a thermal power plant are provided. The wastewater entering the device is pressed by a pressing unit, so that solids in the wastewater remain in the filter screen, while water in the wastewater is discharged through the filter screen and collected by a first annular shell. After the pressing is completed, the filter screen discharges the solids from the bottom, and then the second annular shell injects gas into the first annular shell. The airflow injected into the first annular shell flows in parallel with the radial direction of the filter screen. The airflow blows away the solids blocked on the filter screen, thereby completing the cleaning of the solids attached to the filter screen and ensuring the filtering effect of the filter screen. At the same time, the filter screen can discharge the solids by itself after the filtering is completed, reducing the workload of the staff. At the same time, the first annular shell and the second annular shell combine the two functions of collecting wastewater and cleaning, so that the volume of the entire impurity removal unit is smaller.

[0006] To solve the problems of the prior art, the present invention provides a wastewater treatment device for a thermal power plant, comprising a pressing unit for separating solid matter and water in wastewater, wherein a filter screen in an annular structure is arranged in the pressing unit; a decontamination unit in an annular structure is sleeved on the periphery of the filter screen, wherein the decontamination unit comprises a first annular shell fixedly sleeved on the periphery of the filter screen and a second annular shell sleeved on the periphery of the first annular shell, wherein the first annular shell and the second annular shell are connected to each other, wherein air blown toward the first annular shell passes through the second annular shell, wherein the first annular shell is used to collect water separated by the filter screen, wherein when the filter screen is in a filtering state, air in the second annular shell stops circulating, and after the filter screen completes filtering, the second annular shell blows air into the first annular shell, and the air entering the first annular shell passes through the filter screen and flows into the filter screen.

[0007] Preferably, the first annular shell and the second annular shell are rotatably matched, and a ventilation hole is vertically opened on the inner ring side wall of the second annular shell. The air in the second annular shell flows into the first annular shell through the ventilation hole. The flow direction of the air flowing into the first annular shell from the ventilation hole is parallel to the radial direction of the filter screen, and when the second annular shell blows air into the first annular shell, the second annular shell rotates around the first annular shell.

[0008] Preferably, the opening of the ventilation hole toward the second annular shell is larger than the opening of the ventilation hole toward the first annular shell.

[0009] Preferably, a second annular groove is opened on the outer ring side wall of the second annular shell, and an annular side plate is arranged on the second annular groove. The annular side plate cooperates with the second annular shell in rotation when the second annular shell rotates, and the annular side plate and the first annular shell are always in a relatively static state. An air supply pipe for supplying air to the second annular shell is arranged on the annular side plate.

[0010] Preferably, a rotating unit capable of driving the second annular shell to rotate is provided on the air supply pipe, and when the air supply pipe supplies air to the second annular shell, the air flowing in the air supply pipe drives the rotating unit.

[0011] Preferably, a bottom sealing unit is provided at the bottom of the filter screen, and a pressing plate is provided at the upper part of the filter screen for movement along the axial direction of the filter screen. The bottom sealing unit and the filter screen form a pressing chamber. When the pressing plate descends, the wastewater in the pressing chamber is pressed. After the pressing is completed, the bottom sealing unit is opened, and the solid matter remaining in the filter screen is discharged from the lower part of the filter screen.

[0012] Preferably, the bottom sealing unit includes a rotating disk rotatably arranged at the bottom of the filter screen and a material dropout trough vertically penetrating the rotating disk. The rotating disk rotates so that the material dropout trough can intersect or stagger with the bottom of the filter screen. When the material dropout trough intersects with the bottom of the filter screen, solid matter in the filter screen is discharged from the material dropout trough. When the material dropout trough is staggered with the bottom of the filter screen, the filter screen is in a filtering state.

[0013] Preferably, a preliminary water filtering unit for preliminary filtering of the wastewater is provided on the upper part of the pressing unit, and the preliminary water filtering unit separates the water in the wastewater by centrifugal force.

[0014] Preferably, the preliminary water filtration unit comprises a screening shell rotatably arranged on the upper part of the filter net, the screening shell is evenly provided with screening holes, and a material guide shell is arranged above the preliminary water filtration unit, and the material guide shell guides the wastewater to the upper part of the screening shell.

[0015] The present invention also relates to a method for treating wastewater from a thermal power plant, which adopts a wastewater treatment device for a thermal power plant, and the specific steps are as follows: a pressing unit presses the wastewater entering the inside thereof, so that solid matter in the wastewater remains in a filter screen, while water in the wastewater passes through the filter screen and is discharged and collected by a first annular shell. After the pressing is completed, the filter screen discharges the solid matter from the bottom, and then the second annular shell injects gas into the first annular shell. The airflow injected into the first annular shell flows in a direction parallel to the radial direction of the filter screen, and the airflow blows away the solid matter blocked on the filter screen.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention uses a squeezing unit to squeeze the wastewater entering the interior thereof, so that the solids in the wastewater remain in the filter screen, while the water in the wastewater passes through the filter screen and is discharged and collected by the first annular shell. After squeezing is completed, the filter screen discharges the solids from the bottom, and then the second annular shell injects gas into the first annular shell. The airflow injected into the first annular shell flows in a direction parallel to the radial direction of the filter screen. The airflow blows away the solids blocked on the filter screen, thereby completing the cleaning of the solids attached to the filter screen and ensuring the filtering effect of the filter screen. At the same time, the filter screen can also discharge the solids by itself after filtering is completed, reducing the workload of the staff, and the rotating unit driving the second annular shell to rotate is located outside the first annular shell, and the volume of the first annular shell is small, reducing the space occupancy rate.

[0018] 2. Since the airflow passes through the rotating unit before entering the second annular shell, the flowing airflow will drive the rotating unit, thereby causing the second annular shell to rotate. In this way, the airflow flowing radially along the filter can rotate around the filter, thereby fully covering the filter. The rotating unit is passively driven, so there will be no line problems, ensuring the stability of the filter during filtering, and the cost is lower than that of traditional independent drive devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a wastewater treatment device in a thermal power plant Figure 1 .

[0020] Figure 2 It is a side view of a wastewater treatment device in a thermal power plant.

[0021] Figure 3 It is a wastewater treatment device for thermal power plants. Figure 2 Schematic cross-sectional view at AA in the middle.

[0022] Figure 4 It is a wastewater treatment device for thermal power plants. Figure 3 A local enlarged schematic diagram of point B in the middle.

[0023] Figure 5 The invention is a cutaway stereoscopic schematic diagram of a filter screen of a wastewater treatment device of a thermal power plant after filtration is completed.

[0024] Figure 6 The invention is a cutaway stereoscopic schematic diagram of a filter screen of a wastewater treatment device of a thermal power plant when it is in a filtering state.

[0025] Figure 7 It is a wastewater treatment device for thermal power plants. Figure 6 A partial enlarged schematic diagram of point C in the middle.

[0026] Figure 8 A three-dimensional diagram of a wastewater treatment device in a thermal power plant Figure 2 .

[0027] Fig. 9 A three-dimensional diagram of a wastewater treatment device in a thermal power plant Figure 3 .

[0028] Fig.10 A cutaway perspective diagram of a wastewater treatment unit in a thermal power plant Figure 1 .

[0029] Fig.11 A cutaway perspective diagram of a wastewater treatment unit in a thermal power plant Figure 2 .

[0030] Fig.12 The present invention is a three-dimensional schematic diagram of an impurity removal unit of a wastewater treatment device in a thermal power plant.

[0031] The numbers in the figure are:

[0032] 1. Pressing unit; 11. Filter screen; 12. Bottom sealing unit; 121. Rotating disk; 122. Material chute; 123. First rotary drive; 124. First gear; 125. Housing; 13. Pressing plate; 14. Linear drive; 2. De-impurity unit; 21. First annular housing; 22. Second annular housing; 221. Ventilation hole; 222. Annular side plate; 23. Air supply pipe; 24. Drainage unit; 241. Switch valve; 242. Drainage pipe; 25. Rotating unit; 251. Third annular housing; 252. Annular impeller; 253. Rotating ring; 254. Air pump; 3. Preliminary water filtering unit; 31. Screening housing; 32. Second rotary drive; 33. Second gear; 34. Gear ring; 35. Housing; 36. Air blower; 37. Drainage valve; 4. Material guide housing. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figure 1-Figure 4 , Figure 6 , Figure 7 , Fig.11 and Fig.12 A wastewater treatment device for a thermal power plant comprises a pressing unit 1 for separating solid matter and water in wastewater, wherein the pressing unit 1 is provided with a filter screen 11 with an annular structure; a de-impurity unit 2 with an annular structure is sleeved on the periphery of the filter screen 11, wherein the de-impurity unit 2 comprises a first annular shell 21 fixedly sleeved on the periphery of the filter screen 11 and a second annular shell 22 sleeved on the periphery of the first annular shell 21, wherein the first annular shell 21 and the second annular shell 22 are connected to each other, wherein the second annular shell 22 is provided with air blowing toward the first annular shell 21, wherein the first annular shell 21 is used to collect water separated by the filter screen 11, wherein when the filter screen 11 is in a filtering state, air in the second annular shell 22 stops circulating, and after the filter screen 11 completes filtering, the second annular shell 22 blows air into the first annular shell 21, and the air entering the first annular shell 21 passes through the filter screen 11 and flows into the filter screen 11.

[0035] A first annular groove is formed on the outer ring side wall of the first annular shell 21 , and the second annular shell 22 blows air into the first annular shell 21 through the first annular groove. The wastewater enters the inner ring of the filter screen 11. The pressing unit 1 also includes a pressing plate 13. The pressing plate 13 is arranged on the upper part of the filter screen 11 along the axis of the filter screen 11. When the pressing plate 13 descends, it can press the wastewater in the inner ring of the filter screen 11, so that the water in the wastewater is discharged from the filter screen 11, and the solid matter in the wastewater remains in the filter screen 11. A drainage unit 24 is arranged at the bottom of the first annular shell 21. When the filter screen 11 is in a filtering state, the drainage unit 24 is in an open state. When the filter screen 11 completes filtering and the second annular shell 22 blows air to the first annular shell 21, the drainage unit 24 is in a closed state. Otherwise, the air blown from the second annular shell 22 to the first annular shell 21 will overflow from the drainage unit 24, thereby weakening the airflow velocity from the second annular shell 22 to the first annular shell 21, thereby causing the solid matter attached to the filter screen 11 to be unable to be blown down and discharged by the airflow. The drainage unit 24 includes a switch valve 241 and a drainage pipe 242. The drainage pipe 24 2 is arranged at the bottom of the first annular shell 21, and the switch valve 241 is arranged on the drain pipe 242. When the filter screen 11 is in the filtering state, the switch valve 241 is in the open state. When the filter screen 11 completes the squeezing and filtering, the switch valve 241 is in the closed state. The working principle is as follows: the squeezing unit 1 squeezes the wastewater entering the inside thereof, so that the solids in the wastewater remain in the filter screen 11, and the water in the wastewater passes through the filter screen 11 and is discharged and collected by the first annular shell 21. After the squeezing is completed, the filter screen 11 discharges the solids from the bottom, and then the second annular shell 22 injects gas into the first annular shell 21. The airflow injected into the first annular shell 21 flows in parallel with the radial direction of the filter screen 11. The airflow blows away the solids blocked on the filter screen 11, thereby completing the cleaning of the solids attached to the filter screen 11, ensuring the filtering effect of the filter screen 11 on the filter screen 11. At the same time, the filter screen 11 can also discharge the solids by itself after completing the filtration, reducing the workload of the staff.

[0036] Reference Fig.11 : The first annular shell 21 and the second annular shell 22 are rotatably matched, and a ventilation hole 221 is vertically opened on the inner ring side wall of the second annular shell 22. The air in the second annular shell 22 flows into the first annular shell 21 through the ventilation hole 221. The flow direction of the air flowing into the first annular shell 21 from the ventilation hole 221 is parallel to the radial direction of the filter screen 11, and when the second annular shell 22 blows the air into the first annular shell 21, the second annular shell 22 rotates around the first annular shell 21.

[0037] When the second annular shell 22 rotates, the second annular shell 22 can drive the ventilation hole 221 opened on the upper part thereof to rotate. There is only one ventilation hole 221. The second annular shell 22 drives the ventilation hole 221 to rotate around the filter screen 11. In this way, when the ventilation hole 221 blows out airflow, solid matter attached to the side wall of the filter screen 11 can be blown away by the airflow blown out from the ventilation hole 221, thereby completing the cleaning of the side wall of the filter screen 11.

[0038] Reference Fig.11 : The opening of the ventilation hole 221 toward the second annular shell 22 is larger than the opening of the ventilation hole 221 toward the first annular shell 21 .

[0039] In this way, when the second annular shell 22 blows air into the first annular shell 21 through the ventilation holes 221, the airflow velocity is enhanced after passing through the ventilation holes 221, so that the airflow blown out along the radial direction of the filter 11 can generate stronger wind force on the filter 11 when reaching the filter 11, thereby improving the removal force of solid matter attached to the filter 11.

[0040] Reference Fig.11 and Fig.12 : A second annular groove is opened on the outer ring side wall of the second annular shell 22, and an annular side plate 222 is arranged on the second annular groove. The annular side plate 222 rotates with the second annular shell 22 when the second annular shell 22 rotates, and the annular side plate 222 and the first annular shell 21 are always in a relatively static state. An air supply pipe 23 for supplying air to the second annular shell 22 is arranged on the annular side plate 222.

[0041] Since the annular side plate 222 and the first annular shell 21 are always in a relatively static state, and the first annular shell 21 is fixedly connected to the filter screen 11, the annular side plate 222 will not rotate when the second annular shell 22 rotates, which also ensures that the air supply pipe 23 arranged on the annular side plate 222 can smoothly supply air to the second annular shell 22. If the annular side plate 222 rotates synchronously with the second annular shell 22, the air supply pipe 23 will inevitably be entangled on the annular side plate 222, thereby causing the annular pipe to be torn.

[0042] Reference Fig. 9 and Fig.10 A rotating unit 25 capable of driving the second annular shell 22 to rotate is provided on the air supply pipe 23 . When the air supply pipe 23 supplies air to the second annular shell 22 , the air flowing in the air supply pipe 23 drives the rotating unit 25 .

[0043] The rotating unit 25 includes a third annular shell 251, an annular impeller 252, a rotating ring 253 and an air pump 254. The air pump 254 is arranged at one end of the air supply pipe 23 away from the annular side plate 222. The third annular shell 251 is arranged on the upper part of the second annular shell 22, and the third annular shell 251 has an input end and an output end. The air supply pipe 23 supplies gas from the input end of the third annular shell 251 and discharges it from the output end of the third annular shell 251. The annular impeller 252 is rotatably arranged in the third annular shell 251. The air entering the third annular shell 251 can drive the annular impeller 252 to rotate. The rotating ring 253 is fixedly arranged at the bottom end of the annular impeller 252, and the rotating ring 253 passes through the third annular shell 251 and is fixedly connected to the upper part of the second annular shell 22. When the annular impeller 252 rotates, the second annular shell 22 is driven to rotate through the rotating ring 253.

[0044] Reference Figure 5-Figure 9 A bottom sealing unit 12 is arranged at the bottom of the filter screen 11, and a pressing plate 13 is arranged at the upper part of the filter screen 11 and moves along the axial direction of the filter screen 11. The bottom sealing unit 12 and the filter screen 11 form a pressing chamber. When the pressing plate 13 descends, the waste water in the pressing chamber is pressed. After the pressing is completed, the bottom sealing unit 12 is opened, and the solid matter remaining in the filter screen 11 is discharged from the lower part of the filter screen 11.

[0045] Reference Figure 5-Figure 9 The bottom sealing unit 12 includes a rotating disk 121 rotatably arranged at the bottom of the filter screen 11 and a material drop trough 122 vertically penetrating the rotating disk 121. The rotating disk 121 rotates so that the material drop trough 122 can intersect or stagger with the bottom of the filter screen 11. When the material drop trough 122 intersects with the bottom of the filter screen 11, the solid matter in the filter screen 11 is discharged from the material drop trough 122. When the material drop trough 122 is staggered with the bottom of the filter screen 11, the filter screen 11 is in a filtering state.

[0046] The bottom sealing unit 12 also includes a first rotary driver 123, a first gear 124 and a casing 125. The casing 125 is sleeved on the periphery of the rotating disk 121. Meshing teeth are evenly provided on the side walls of the rotating disk 121. The meshing teeth are arranged around the axis of the rotating disk 121. The first gear 124 is rotatably arranged on one side of the rotating disk 121. The rotating disk 121 is meshed with the first gear 124 through the meshing teeth. The first rotary driver 123 is arranged at the end of the first gear 124. The first rotary driver 123 is used to drive the first gear 124 to rotate. The first rotary driver 123 is preferably a servo motor. A linear driver 14 is provided on the upper part of the pressing plate 13 for driving the pressing plate 13 to move up and down along the axis of the filter screen 11. The linear driver 14 is preferably a linear cylinder. The linear driver 14 is started at a rated time interval. The linear driver 14 presses the pressing plate 13 to move up and down along the axis of the filter screen 11. The pressing plate 13 is driven to slide down into the filter screen 11 and press the solid matter in the filter screen 11 to further dehydrate the solid matter. After the pressing is completed, the linear drive 14 drives the pressing plate 13 to lift, and the rotating disk 121 rotates under the action of the first rotary drive 123, so that the blanking trough 122 intersects with the lower part of the filter screen 11, and the filter screen 11 discharges the solid matter after pressing from the blanking trough 122. It is worth noting that when the blanking trough 122 intersects with the filter screen 11, the pressing plate 13 is always located in the inner ring of the filter screen 11, so as to prevent the solid matter that has not been completely dehydrated and falls from above from being discharged directly through the blanking trough 122. After the filter screen 11 discharges the solid matter, the rotating disk 121 rotates, and the blanking trough 122 on the rotating disk 121 is staggered with the filter screen 11, and the solid matter that falls from the top of the filter screen 11 is received by the rotating disk 121.

[0047] Reference Figure 1-Figure 3 A preliminary water filtering unit 3 for preliminary filtering of wastewater is arranged on the upper part of the pressing unit 1. The preliminary water filtering unit 3 separates the water in the wastewater by centrifugal force.

[0048] The preliminary water filtering unit 3 includes a screening shell 31, a second rotary driver 32, a second gear 33, a gear ring 34, a housing 35, a blower 36 and a drain valve 37. The screening shell 31 is rotatably arranged on the upper part of the filter screen 11. Screening holes are evenly provided on the screening shell 31. Wastewater first enters the screening shell 31 for screening, so that water and solids are separated, and then the solids remaining in the screening shell 31 can be discharged into the filter screen 11. The gear ring 34 is fixedly arranged on the screening shell 31. The second gear 33 is rotatably arranged on one side of the gear ring 34. The second gear 33 and the gear ring 34 are meshed with each other. The second rotary driver 32 is arranged at the end of the second gear 33. The second rotary driver 32 is used to drive the second gear The wheel 33 rotates, and the outer shell 35 is sleeved on the periphery of the screening shell 31. When the screening shell 31 rotates, the water is thrown into the outer shell 35. The drain valve 37 is set at the bottom of the outer shell 35. When the screening shell 31 is in rotation, the drain valve 37 is in an open state, and the water thrown into the outer shell 35 is discharged through the drain valve 37. The air outlet fan 36 is set on the side wall of the outer shell 35. The air outlet fan 36 is started after the screening shell 31 rotates. The air outlet fan 36 provides an airflow flowing in the radial direction of the screening shell 31 to the screening shell 31. When the side wall of the screening shell 31 passes through the air outlet fan 36, the solids blocked on the screening holes can be blown away, thereby avoiding the situation that the screening holes on the screening shell 31 are blocked by solids.

[0049] Reference Figure 1 and Figure 2 The preliminary water filtration unit 3 includes a screening shell 31 rotatably arranged on the upper part of the filter screen 11, and screening holes are evenly opened on the screening shell 31. A material guide shell 4 is arranged above the preliminary water filtration unit 3, and the material guide shell 4 guides the waste water to the upper part of the screening shell 31.

[0050] The guide shell 4 is an annular structure, and the upper part of the guide shell is inclined from the inside to the outside. The wastewater is put into the guide shell 4, and after being guided by the guide shell 4, the wastewater falls into the preliminary water filtering unit 3. At this time, the point where the wastewater falls into the inner wall of the screening shell 31 is located on the upper side of the screening shell 31, so that when the screening shell 31 rotates, the solids in the wastewater can be retained in the screening shell 31 for a longer time, and finally fall into the filter screen 11 under the action of gravity, and then the pressing plate 13 in the pressing unit 1 presses the solids in the filter screen 11, so that the residual water in the solids is squeezed out, thereby achieving the removal of solids in the wastewater.

[0051] Reference Figure 1-Figure 12: The present invention also relates to a method for treating wastewater from a thermal power plant, which adopts the above-mentioned wastewater treatment device for a thermal power plant, and the specific steps are as follows: the pressing unit 1 presses the wastewater entering the inside thereof, so that the solid matter in the wastewater remains in the filter screen 11, and the water in the wastewater passes through the filter screen 11 and is discharged and collected by the first annular shell 21. After the pressing is completed, the filter screen 11 discharges the solid matter from the bottom, and then the second annular shell 22 injects gas into the first annular shell 21. The airflow injected into the first annular shell 21 flows in a direction parallel to the radial direction of the filter screen 11, and the airflow blows away the solid matter blocked on the filter screen 11.

[0052] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A wastewater treatment device for a thermal power plant, comprising a pressing unit (1) for separating solid matter and water in wastewater, wherein a filter screen (11) having an annular structure is provided in the pressing unit (1); It is characterized in that An impurity removal unit (2) having an annular structure is sleeved on the periphery of the filter (11), the impurity removal unit (2) comprising a first annular shell (21) fixedly sleeved on the periphery of the filter (11) and a second annular shell (22) sleeved on the periphery of the first annular shell (21), the first annular shell (21) and the second annular shell (22) being communicated with each other, air blown toward the first annular shell (21) passes through the second annular shell (22), the first annular shell (21) is used to collect moisture separated by the filter (11), when the filter (11) is in a filtering state, the air in the second annular shell (22) stops flowing, after the filter (11) completes filtering, the second annular shell (22) blows air into the first annular shell (21), and the air entering the first annular shell (21) passes through the filter (11) and flows into the filter (11); The first annular shell (21) and the second annular shell (22) are rotatably matched, a ventilation hole (221) is vertically opened on the inner ring side wall of the second annular shell (22), and air in the second annular shell (22) flows into the first annular shell (21) through the ventilation hole (221), and the flow direction of the air flowing into the first annular shell (21) from the ventilation hole (221) is parallel to the radial direction of the filter screen (11), and when the second annular shell (22) blows the air into the first annular shell (21), the second annular shell (22) rotates around the first annular shell (21); A second annular groove is formed on the outer ring side wall of the second annular shell (22), an annular side plate (222) is disposed on the second annular groove, the annular side plate (222) rotates in coordination with the second annular shell (22) when the second annular shell (22) rotates, and the annular side plate (222) and the first annular shell (21) are always in a relatively static state, and an air supply pipe (23) is disposed on the annular side plate (222) for supplying air to the second annular shell (22); A rotating unit (25) capable of driving the second annular shell (22) to rotate is provided on the air supply pipe (23); when the air supply pipe (23) supplies air to the second annular shell (22), the air flowing in the air supply pipe (23) drives the rotating unit (25); The rotating unit (25) comprises a third annular shell (251), an annular impeller (252), a rotating ring (253) and an air pump (254). The air pump (254) is arranged at one end of the air supply pipe (23) away from the annular side plate (222). The third annular shell (251) is arranged on the upper part of the second annular shell (22). The third annular shell (251) has an input end and an output end. The air supply pipe (23) supplies gas from the input end of the third annular shell (251) and outputs gas from the third annular shell (251). ), the annular impeller (252) is rotatably disposed in the third annular shell (251), and air entering the third annular shell (251) can drive the annular impeller (252) to rotate. The rotating ring (253) is fixedly disposed at the bottom end of the annular impeller (252), and the rotating ring (253) passes through the third annular shell (251) and is fixedly connected to the upper part of the second annular shell (22). When the annular impeller (252) rotates, the second annular shell (22) is driven to rotate via the rotating ring (253).

2. A thermal power plant wastewater treatment device according to claim 1, characterized in that: An opening of the ventilation hole (221) facing the second annular shell (22) is larger than an opening of the ventilation hole (221) facing the first annular shell (21).

3. A wastewater treatment device for a thermal power plant according to claim 1, characterized in that: A bottom sealing unit (12) is arranged at the bottom of the filter screen (11), and a pressing plate (13) is arranged at the top of the filter screen (11) to move along the axial direction of the filter screen (11). The bottom sealing unit (12) and the filter screen (11) form a pressing chamber. When the pressing plate (13) descends, waste water in the pressing chamber is pressed. After the pressing is completed, the bottom sealing unit (12) is opened, and solid matter remaining in the filter screen (11) is discharged from the bottom of the filter screen (11).

4. A wastewater treatment device for a thermal power plant according to claim 3, characterized in that: The bottom sealing unit (12) comprises a rotating disk (121) rotatably arranged at the bottom of the filter screen (11) and a material drop groove (122) vertically penetrating the rotating disk (121); the rotating disk (121) is rotated so that the material drop groove (122) can intersect or stagger with the bottom of the filter screen (11); when the material drop groove (122) intersects with the bottom of the filter screen (11), solid matter in the filter screen (11) is discharged from the material drop groove (122); when the material drop groove (122) is staggered with the bottom of the filter screen (11), the filter screen (11) is in a filtering state.

5. A thermal power plant wastewater treatment device according to claim 1, characterized in that: A preliminary water filtering unit (3) for preliminary filtering of the wastewater is arranged on the upper part of the pressing unit (1), and the preliminary water filtering unit (3) separates water in the wastewater by throwing out the water through centrifugal force.

6. A wastewater treatment device for a thermal power plant according to claim 5, characterized in that: The preliminary water filtering unit (3) comprises a screening shell (31) rotatably arranged on the upper part of the filter screen (11), the screening shell (31) being evenly provided with screening holes, and a material guide shell (4) being arranged above the preliminary water filtering unit (3), the material guide shell (4) guiding the waste water to the upper part of the screening shell (31).

7. A method for treating wastewater from a thermal power plant, using a wastewater treatment device for a thermal power plant as claimed in any one of claims 1 to 6, characterized in that: The specific steps are as follows: the squeezing unit (1) squeezes the wastewater entering the squeezing unit so that the solid matter in the wastewater remains in the filter screen (11), while the water in the wastewater passes through the filter screen (11) and is discharged and collected by the first annular shell (21). After the squeezing is completed, the filter screen (11) discharges the solid matter from the bottom, and then the second annular shell (22) injects gas into the first annular shell (21). The airflow injected into the first annular shell (21) flows in a direction parallel to the radial direction of the filter screen (11), and the airflow blows away the solid matter blocked on the filter screen (11).

Images