Double-effect coupling desulfurization wastewater zero-discharge treatment device for coal-fired power plant

Abstract

The invention is suitable for the technical field of wastewater treatment, and provides a coal-fired power plant double-effect coupling desulfurization wastewater zero-discharge treatment device, which comprises a wall scraping crystallizer, a wall scraping crystallizer, a double-effect coupling device, a double-effect coupling device and a double-effect coupling device, a preheater is arranged at the bottom end of the evaporation concentrator, and a circulating pump is arranged at the bottom of the preheater; a secondary steam discharge pipe is connected between the steam condenser and the evaporation concentrator, and a preheater steam discharge pipe is connected between the preheater and the secondary steam discharge pipe; a steam condenser condensation calandria is connected between the middle barrel and the steam condenser; a condensed tail gas exhaust pipe is connected between the condensed water tank and the steam condenser, and a jet vacuum pump and a jet water pump are arranged on the condensed water tank. Therefore, the double-effect series treatment process of crystallization drying and evaporation concentration can be adopted, the utilization efficiency of steam is improved, the side scraping plate and the bottom scraping plate can be automatically replaced without shutdown, the continuous operation time of the device is prolonged, and a good cleaning effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a double-effect coupled desulfurization wastewater zero-discharge treatment device for a coal-fired power plant. Background Art

[0002] Coal-fired power generation is currently the predominant method of generating electricity in my country. The combustion of coal produces flue gas containing large amounts of SO2, which pollutes the air. Therefore, appropriate flue gas desulfurization methods must be employed to achieve standard flue gas emissions. Currently, desulfurization wastewater is typically treated using a neutralization-chemical precipitation-flocculation-clarification process, resulting in water quality that does not meet current environmental requirements.

[0003] In response to the above problems, those skilled in the art have made improvements to the existing technology. For example, the Chinese patent with the authorization announcement number CN109179538B discloses a zero-emission treatment system for desulfurization wastewater concentration, evaporation and crystallization, which includes a concentration evaporator, a steam compressor, a steam receiver, an evaporation heat exchange surface, a steam condensate receiver, a water vapor separation box and a natural circulation heating device that are circulated and connected in sequence. The evaporation heat exchange surface is located in the concentration evaporator, and its upper end extends out of the concentration evaporator and is connected to the steam receiver located on the top surface of the concentration evaporator. The lower end is connected to the steam receiver located on the top surface of the concentration evaporator. The end is connected to the steam condensate receiver located in the concentrating evaporator, the lower part of the concentrating evaporator is the desulfurization wastewater part, and the upper part is the low-temperature steam part; the low-temperature steam in the low-temperature steam part is sucked into the steam compressor through the first pipeline, and is pressurized and heated therein to form high-pressure and high-temperature steam, and the temperature difference between the low-temperature steam and the high-pressure and high-temperature steam is 8 to 10°C, which can realize the concentration and crystallization of the desulfurization wastewater. However, in the above-mentioned treatment system, the concentration and evaporation crystallization of the desulfurization wastewater are carried out by the same device, resulting in a long time required for a single operation, which is still inconvenient to use.

[0004] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0005] In response to the above-mentioned defects, the purpose of the present invention is to provide a double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants, which can not only adopt a double-effect series treatment process of crystallization drying and evaporation concentration to improve the utilization efficiency of steam, but also can automatically replace the side scrapers and bottom scrapers without stopping the machine, thereby extending the continuous operation time of the device and ensuring a good cleaning effect.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a double-effect coupled desulfurization wastewater zero-discharge treatment device for a coal-fired power plant, comprising: a scraper crystallizer, the outer shell of which is provided with a steam jacket; an evaporation concentrator, the top of which is provided with a raw liquid inlet, the bottom of the evaporation concentrator is provided with a preheater, the bottom of the preheater is provided with a circulating pump, and a steam discharge pipe is provided between the preheater and the scraper crystallizer; a steam condenser, a secondary steam discharge pipe is connected between the steam condenser and the evaporation concentrator, and a preheater exhaust pipe is connected between the preheater and the secondary steam discharge pipe; an intermediate barrel, a steam condenser condensation discharge pipe is connected between the steam condenser and the steam condenser, and a preheater condensation discharge pipe is connected between the preheater and the steam condenser condensation discharge pipe; a condensation water tank, a condensation tail gas discharge pipe is connected between the steam condenser and the steam condenser, a drainage pipe is connected between the condensation water tank and the intermediate barrel, a jet vacuum pump and a jet water pump are provided on the condensation water tank, and a vacuum pump return pipe is connected between the jet water pump and the condensation water tank.

[0007] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device of a coal-fired power plant of the present invention, pipes are provided between the intermediate barrel and the preheater, and between the intermediate barrel and the steam condenser. A preheater drainage balancing valve is provided on the pipe between the intermediate barrel and the preheater, and a steam condenser drainage balancing valve is provided on the pipe between the intermediate barrel and the steam condenser.

[0008] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device for a coal-fired power plant of the present invention, the jet water pump draws water from the inside of the condensate water tank, and after pressurization, rapidly injects the water into the jet vacuum pump. The jet vacuum pump is connected to the condensate tail gas exhaust pipe, thereby forming a negative pressure environment in the scraper crystallizer, evaporation concentrator, preheater, steam condenser and intermediate barrel.

[0009] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device of a coal-fired power plant of the present invention, a rotating shaft is provided inside the scraper crystallizer, a buoyancy seat is sleeved on the rotating shaft, a fixed frame plate is mounted above the buoyancy seat, two clamping rings are symmetrically slidably provided on the fixed frame plate, the two clamping rings abut against each other to form a circular ring slidably connected to the rotating shaft, a plurality of guide rails are evenly arranged around the circumference of the buoyancy seat, vertical avoidance grooves are opened on the guide rails, a through groove is provided on the end of the avoidance groove away from the rotating shaft, a mounting shaft is provided in the avoidance groove, and the mounting shaft is rotatably connected The cam is connected to the active frame, and the active frame is elastically connected to the driven frame on one side close to the rotating shaft. The active frame and the driven frame are both slidably connected to the guide rail. A number of side scrapers are evenly arranged on the mounting shaft. A turntable is provided on the top of the mounting shaft. A number of guide grooves are provided on the turntable. A guide column matching the guide groove is provided on the driven frame. A sliding sleeve is provided between the fixed frame plate and the buoyancy seat and is arranged on the outside of the rotating shaft. A reciprocating seat is provided on the sliding sleeve. A center plate passing through the driven frame is provided on the active frame, and a top connecting rod is rotatably provided between the reciprocating seat and the center plate.

[0010] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device of a coal-fired power plant of the present invention, a base is rotatably provided at the bottom end of the rotating shaft, a plurality of bottom scrapers are evenly arranged around the circumference of the base, the bottom scrapers are all rotatably connected to the base, a bottom electromagnet is provided on the top surface of the base, and an adjusting member corresponding to the bottom scraper is elastically connected above the base, and a bottom connecting rod is rotatably connected between the corresponding adjusting member and the bottom scraper, a bottom magnetic member is slidably provided on the rotating shaft above the adjusting member, and at least one pressure seat corresponding to the adjusting member is provided on the bottom magnetic member.

[0011] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device of a coal-fired power plant of the present invention, the top surface of the end of the clamping ring away from the rotating shaft is fixedly connected to a top magnetic part, and the fixed frame plate on the side of the clamping ring away from the rotating shaft is fixedly connected to a top electromagnet.

[0012] According to the coal-fired power plant double-effect coupled desulfurization wastewater zero-discharge treatment device of the present invention, the through groove is not located at the center of the end of the guide rail, and the side wall of the through groove is provided with a chamfer that cooperates with the side scraper. When the side scraper passes through the through groove, it drives the turntable to rotate.

[0013] According to the double-effect coupled desulfurization wastewater zero-discharge treatment device for a coal-fired power plant of the present invention, active slides are provided on both end side walls of the active frame, and driven slides are provided on both end side walls of the driven frame. Limiting grooves cooperating with the active slides and the driven slides are provided on both side walls of the avoidance groove.

[0014] According to the coal-fired power plant double-effect coupled desulfurization wastewater zero-discharge treatment device of the present invention, an extension piece is provided at the bottom end of the pressure seat side wall located in front of the rotating direction of the rotating shaft.

[0015] The purpose of the present invention is to provide a double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants, which has the following beneficial effects: By setting up components such as scraper crystallizer, evaporation concentrator and steam condenser, and adopting a double-effect series treatment process of crystallization drying and evaporation concentration, the steam generated in the scraper crystallization kettle is used to preheat the raw material liquid in the evaporation concentrator, thereby improving the utilization efficiency of steam.

[0016] By setting up structures such as a buoyancy seat, an active frame, a mounting shaft, a base and a bottom magnetic part, the side scrapers can be automatically adjusted according to the liquid level height, and the side scrapers and bottom scrapers can be automatically replaced, which extends the continuous operation time of the device without stopping for replacement, ensuring a good cleaning effect.

[0017] To sum up, the beneficial effects of this application are: it can not only adopt a dual-effect series treatment process of crystallization drying and evaporation concentration to improve the utilization efficiency of steam, but also can automatically replace the side scrapers and bottom scrapers without stopping the machine, thereby extending the continuous operation time of the device and ensuring a good cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the connection relationship between the various mechanisms of the present invention; Figure 2 This is a schematic diagram of the scraped wall crystallizer structure; Figure 3 yes Figure 2 Front cross-sectional view of Figure 4 This is a schematic diagram of the internal structure of the scraped wall crystallizer; Figure 5 It is a schematic diagram of the structure at the buoyancy seat; Figure 6 This is an enlarged view of the turntable from above; Figure 7 This is a schematic diagram of the structure at the base; In the figure: 1-scraper crystallizer, 11-top cover, 12-rotating shaft, 121-support plate, 122-bending plate, 123-driving member, 13-buoyancy seat, 131-fixed frame plate, 132-bracket, 133-clamping ring, 134-top magnetic member, 135-top electromagnet, 136-guide rail, 14-mounting shaft, 141-side scraper, 142-turntable, 1421-guide groove, 15-active frame, 151-center plate, 16-driven frame, 17-sliding sleeve, 171-reciprocating seat, 172-top connecting rod, 18-base, 181-bottom scraper, 182-bottom electromagnet, 183-adjusting member, 184-telescopic shaft, 185-bottom connecting rod, 19-bottom magnetic member, 191-pressing seat, 192- Extension, 2-steam jacket, 21-steam inlet regulating valve group, 22-condensate trap group, 3-evaporation concentrator, 31-preheater, 32-circulation pump, 33-supplementary pipe, 34-steam drain pipe, 35-secondary steam drain pipe, 36-preheater condensate drain pipe, 37-preheater exhaust pipe, 4-steam condenser, 41-condensation tail gas drain pipe, 42-steam condenser condensate drain pipe, 43-cooling water outlet, 44-cooling water inlet, 5-intermediate barrel, 51-steam condenser drain balancing valve, 52-preheater drain balancing valve, 53-drain valve, 54-drain valve, 55-drain pressure balancing valve, 6-condensate tank, 61-vacuum pump return pipe, 62-jet vacuum pump, 63-jet water pump, 7-slag barrel. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figures 1 to 7 The present invention provides a double-effect coupled desulfurization wastewater zero-discharge treatment device for a coal-fired power plant, comprising: The scraped wall crystallizer 1 is provided with a support mechanism (not shown) on its outer bottom. The support mechanism can be a support frame, support legs, or other structures. This is prior art and will not be described in detail. The scraped wall crystallizer 1 is externally sheathed with a steam jacket 2, which is fixedly connected to the scraped wall crystallizer 1. Two pipes are fixedly connected to the steam jacket 2, which are connected to a steam inlet regulating valve group 21 and a condensate drain valve group 22, respectively. The pipe connected to the steam inlet regulating valve group 21 is used to input high-temperature steam into the steam jacket 2. The high-temperature steam is used to provide heat to the scraped wall crystallizer 1 to achieve thermal evaporation and crystallization of the concentrated liquid therein. The pipe connected to the condensate drain valve group 22 is used to discharge condensate from the steam jacket 2.

[0021] The top of the evaporation concentrator 3 is fixedly connected to a raw liquid inlet. The desulfurization wastewater is treated in a triple tank (i.e., a neutralization tank, a reaction tank, and a flocculation tank, which is the existing technology and will not be described in detail) and then enters the evaporation concentrator 3 at the raw liquid inlet. A preheater 31 is fixedly connected to the bottom end of the evaporation concentrator 3. The preheater 31 is used to preheat the raw material liquid. A circulation pump 32 is fixedly installed at the bottom of the preheater 31. The circulation pump 32 is used to drive the raw material liquid to circulate between the preheater 31 and the evaporation concentrator 3. A steam exhaust pipe 34 is connected between the preheater 31 and the scraper wall crystallizer 1. The steam generated in the scraper wall crystallizer 1 enters the preheater 31 through the steam exhaust pipe 34. When the raw material liquid circulates between the preheater 31 and the evaporation concentrator 3, the above-mentioned steam can heat the raw material liquid, and the water in the raw material liquid evaporates to form secondary steam, thereby increasing the concentration of the raw material liquid to form a concentrated liquid. A replenishing pipe 33 is also fixedly connected between the evaporation concentrator 3 and the scraper wall crystallizer 1. The replenishing pipe 33 is used to discharge the concentrated liquid in the evaporation concentrator 3 into the scraper wall crystallizer 1.

[0022] The steam condenser 4 is fixedly connected to the evaporation concentrator 3 via a secondary steam exhaust pipe 35. A preheater exhaust pipe 37, which is in communication with the secondary steam exhaust pipe 35, is fixedly connected to the preheater 31 and is capable of discharging the secondary steam generated within the evaporation concentrator 3 into the steam condenser 4. A cooling water inlet 44 and a cooling water outlet 43 are fixedly connected to the steam condenser 4. To control the temperature difference between the steam at the outlet of the evaporation concentrator 3 and the steam at the outlet of the scraped wall crystallizer 1, a pressure regulating valve is provided on the preheater exhaust pipe 37 to adjust the steam pressure difference between the outlets of the evaporation concentrator 3 and the scraped wall crystallizer 1.

[0023] The intermediate barrel 5 is connected to the steam condenser 4 via a steam condenser condensate drain pipe 42. A preheater condensate drain pipe 36, which is connected to the steam condenser condensate drain pipe 42, is fixedly connected to the preheater 31. Pipes are fixedly connected between the intermediate barrel 5 and the preheater 31, and between the intermediate barrel 5 and the steam condenser 4. A preheater drain balancing valve 52 is installed on the pipe between the intermediate barrel 5 and the preheater 31, and a steam condenser drain balancing valve 51 is installed on the pipe between the intermediate barrel 5 and the steam condenser 4. A drain valve 53 and a drain valve 54 are fixedly connected to the intermediate barrel 5. The drain valve 53 is used to drain impurities from the intermediate barrel 5, and the drain valve 54 is used to drain condensed water from the intermediate barrel 5. A drain pressure balancing valve 55 is also fixedly connected to the intermediate barrel 5 to maintain air pressure balance within the intermediate barrel 5 when draining water.

[0024] Condensate tank 6 is connected to steam condenser 4 via condensate tail gas discharge pipe 41. A drain pipe is connected between condensate tank 6 and intermediate drum 5, with drain valve 54 fixedly connected to the drain pipe. A jet vacuum pump 62 and a jet water pump 63 are fixedly mounted on condensate tank 6. Jet water pump 63 is connected to condensate tank 6 via vacuum pump return pipe 61. Jet water pump 63 pumps water from condensate tank 6, pressurizes it, and rapidly injects it into jet vacuum pump 62, which is connected to condensate tail gas discharge pipe 41. This creates negative pressure within scraped wall crystallizer 1, evaporative concentrator 3, preheater 31, steam condenser 4, and intermediate drum 5.

[0025] As a further embodiment of the present invention, the scraped wall crystallizer 1 comprises: The top cover 11 is detachably connected to the top of the scraper crystallizer 1. The connection between the top cover 11 and the scraper crystallizer 1 can be bolted, clamped, etc., and the top cover 11 and the scraper crystallizer 1 are sealed. The bottom of the scraper crystallizer 1 is an inverted cone shape, which is convenient for the discharge of the crystallized material. The bottom of the scraper crystallizer 1 is provided with an opening, and a hatch that can be opened and closed automatically is provided at the opening. The structure and driving method of the hatch are common knowledge to those skilled in the art, so they will not be repeated in the present invention.

[0026] The rotating shaft 12 is rotatably arranged inside the scraper crystallizer 1, and the top end of the rotating shaft 12 is rotatably connected to the support plate 121. Furthermore, the rotating shaft 12 and the support plate 121 are connected by structures such as bearings or bushings. The support plate 121 is overlapped on the top surface of the scraper crystallizer 1, and a driving member 123 is fixedly installed on the support plate 121. The output shaft of the driving member 123 is connected to the rotating shaft 12 by a belt drive, so that the driving member 123 can drive the rotating shaft 12 to rotate reciprocatingly. The outside of the driving member 123 is protected (for example, a sealed protective shell) to prevent it from being damaged by steam. This is a prior art and will not be described in detail.

[0027] The buoyancy seat 13 is slidably sleeved on the rotating shaft 12, and two sliding grooves are opened on the surface of the rotating shaft 12. A fixed frame plate 131 is mounted above the buoyancy seat 13, and a number of brackets 132 are fixedly connected to the fixed frame plate 131. The brackets 132 are all fixedly connected to the top surface of the buoyancy seat 13. Two snap rings 133 are symmetrically provided on the fixed frame plate 131. The snap rings 133 are both semicircular, and the two snap rings 133 are symmetrically arranged compared to the axis of the rotating shaft 12. The snap rings 133 are all slidably connected to the top surface of the fixed frame plate 131, that is, the top surface of the fixed frame plate 131 is opened with two connecting grooves, and the snap rings 133 are fixedly connected to the connecting blocks arranged in the connecting grooves, and the connecting blocks correspond to the connecting grooves one by one. A first slider is fixedly connected to the inner sidewall of each snap ring 133. When the ends of the two snap rings 133 abut against each other, they form a circular ring. At this point, the two first sliders are respectively located in the two slide grooves, allowing the rotating shaft 12 to drive the buoyancy seat 13 to rotate synchronously. A top magnetic member 134 is fixedly connected to the top surface of the end of the snap ring 133 that is away from each other. A top electromagnet 135 is fixedly connected to the top surface of the fixed frame plate 131 on the side of the snap ring 133 that is away from the rotating shaft 12. The position of the snap ring 133 can be adjusted by changing the direction of the force (attractive or repulsive force) applied by the top electromagnet 135 on the top magnetic member 134.

[0028] A plurality of vertical mounting shafts 14 are evenly arranged around the periphery of the buoyancy seat 13. A plurality of guide rails 136 are fixedly connected to the side wall of the buoyancy seat 13. The mounting shafts 14 correspond one to one with the guide rails 136. The guide rails 136 are provided with an escape groove running through in the vertical direction. The escape groove is provided at the end of the guide rail 136 away from the rotating shaft 12. A through groove is provided on the side wall of the escape groove away from the rotating shaft 12. The mounting shafts 14 are all rotatably connected to the active frame 15. The active frame 15 is a bow-shaped structure. The bottom end of the mounting shaft 14 is rotatably connected to the bottom surface of the active frame 15. The top end of the mounting shaft 14 passes through the top surface of the active frame 15. Furthermore, the mounting shaft 14 and the active frame 15 are connected by structures such as bearings or bushings. A plurality of side scrapers 141 are evenly arranged around the side wall of the mounting shaft 14. The side scrapers 141 are all fixedly connected to the mounting shaft 14. The side scrapers 141 can pass through the through groove and abut the inner side wall of the scraper crystallizer 1. Active slides are fixedly connected to both side walls of the active frame 15, and limiting grooves corresponding to the active slides are opened on the side walls of the avoidance groove. Through the sliding connection between the active slides and the limiting grooves, the active frame 15 can slide along the guide rail 136.

[0029] The driven frame 16 is positioned on the side of the active frame 15 near the rotating shaft 12. A plurality of first compression springs are interposed between adjacent driven frames 16 and the active frame 15. Driven slides that engage with retaining grooves are fixedly connected to the sidewalls of each driven frame 16. The top of the driven frame 16 extends above the active frame 15 and then bends toward the active frame 15. The bent area is horizontal, and a guide post is fixedly connected to the bottom surface of the bent area. The top end of the mounting shaft 14 passes through the top surface of the active frame 15 and is fixedly connected to the turntable 142. The top surface of the turntable 142 is provided with a number of guide grooves 1421 corresponding to the guide columns. The guide grooves 1421 correspond one-to-one to the side scrapers 141. The guide grooves 1421 are all arc-shaped grooves symmetrically arranged with the center of the side scraper 141. The ends of adjacent guide grooves 1421 are close to each other but not connected. The through groove is not located at the center of the end of the guide rail 136, that is, there is a certain offset distance between the through groove and the center of the end of the guide rail 136, and the through groove is provided with a chamfer that can cooperate with the side scraper 141. When the side scraper 141 passes through the through groove, under the action of the through groove position, it can drive the turntable 142 to rotate a certain angle.

[0030] The sliding sleeve 17 is disposed between the fixed frame plate 131 and the buoyancy seat 13. The two ends of the sliding sleeve 17 are rotatably connected to the bottom surface of the fixed frame plate 131 and the top surface of the buoyancy seat 13, respectively. Furthermore, the sliding sleeve 17 and the fixed frame plate 131, as well as the sliding sleeve 17 and the buoyancy seat 13, are connected via structures such as bearings or bushings, allowing the two ends of the sliding sleeve 17 to abut against the fixed frame plate 131 and the buoyancy seat 13, respectively. The sliding sleeve 17 is slidably mounted on the rotating shaft 12. A second slider disposed in a slide groove is fixedly connected to the inner side wall of the sliding sleeve 17, allowing the sliding sleeve 17 to rotate synchronously with the rotating shaft 12. A reciprocating seat 171 is provided on the sliding sleeve 17. A reciprocating groove is provided on the surface of the sliding sleeve 17 to cooperate with the reciprocating seat 171. Its structure can refer to the reciprocating screw. A reciprocating guide column is provided on the reciprocating seat 171 to cooperate with the reciprocating groove. A number of limit rods passing through the reciprocating seat 171 are fixedly connected between the fixed frame plate 131 and the buoyancy seat 13. When the sliding sleeve 17 rotates unidirectionally, it can drive the reciprocating seat 171 to reciprocate along the sliding sleeve 17. A center plate 151 passing through the driven frame 16 is fixedly connected to the side wall of the active frame 15 near the rotating shaft 12. Relative movement can occur between the center plate 151 and the driven frame 16. A top connecting rod 172 is rotatably provided between the center plate 151 and the reciprocating seat 171, that is, one end of the top connecting rod 172 is rotatably connected to the center plate 151, and the other end of the top connecting rod 172 is rotatably connected to the reciprocating seat 171. Furthermore, the top connecting rod 172 and the center plate 151, as well as the top connecting rod 172 and the reciprocating seat 171 are all hinged and can be connected by structures such as pins or hinges.

[0031] The base 18 is provided at the bottom of the rotating shaft 12, and the base 18 is rotatably connected to the rotating shaft 12. Furthermore, the base 18 is connected to the rotating shaft 12 through a bearing or a bushing. A plurality of bottom scrapers 181 are evenly arranged around the circumference of the base 18, and the bottom scrapers 181 are all rotatably connected to the base 18. Furthermore, the bottom scrapers 181 and the base 18 are hinged, such as a pin hinge or a hinge connection. A bottom electromagnet 182 is fixedly installed on the top surface of the base 18, and a number of adjusting parts 183 are evenly arranged on the top of the base 18. The adjusting parts 183 correspond to the bottom scrapers 181 one by one. The adjacent adjusting parts 183 and the bottom scrapers 181 are rotatably connected with bottom connecting rods 185, that is, one end of the bottom connecting rod 185 is rotatably connected to the adjusting part 183, and the other end of the bottom connecting rod 185 is rotatably connected to the bottom scraper 181. Furthermore, the bottom connecting rod 185 and the adjusting part 183, as well as the bottom connecting rod 185 and the bottom scraper 181 are all hinged, such as a pin hinge or a hinge connection. Several telescopic shafts 184 are provided between the adjusting member 183 and the base 18. The telescopic shafts 184 include an inner shaft and an outer shaft, wherein the outer shaft is fixedly connected to the base 18, the inner shaft is fixedly connected to the adjusting member 183, the inner shaft is passed through the inside of the outer shaft, and a second compression spring is provided between the inner shaft and the outer shaft. When the second compression spring is in a natural state, the bottom scraper 181 does not contact the bottom surface of the scraping crystallizer 1.

[0032] The bottom magnetic member 19 is disposed above the base 18 and is slidably mounted on the outside of the rotating shaft 12. A third slider located within a chute is fixedly connected to the bottom magnetic member 19, allowing the bottom magnetic member 19 to rotate synchronously with the rotating shaft 12. At least one pressure seat 191 is fixedly connected to the bottom magnetic member 19, and the number of pressure seats 191 is less than the number of adjustment members 183.

[0033] See also Figures 1 to 7 Preferably, a hollow cavity is provided inside the buoyancy seat 13 so that it can provide sufficient buoyancy support.

[0034] See also Figures 1 to 7 Preferably, when the reciprocating seat 171 is located at the bottom of its motion range, the side scraper 141 abuts against the inner wall of the scraper crystallizer 1, and when the bottom magnetic part 19 is close to the bottom of its motion range, the bottom scraper 181 abuts against the bottom surface of the scraper crystallizer 1, and the bottom connecting rod 185 is made of a hard and slightly deformable material, such as spring steel, PEEK or polyoxymethylene.

[0035] See also Figures 1 to 7 Preferably, an extension piece 192 is fixedly connected to the bottom end of the side wall of the pressure seat 191 located in front of the rotation direction of the rotating shaft 12, and the extension piece 192 can correspond to the adjusting piece 183 to prevent the pressure seat 191 and the adjusting piece 183 from being out of engagement during the rotation of the rotating shaft 12.

[0036] See also Figures 1 to 7Preferably, the bottom surfaces of both ends of the support plate 121 are fixedly connected with a bending plate 122, and a slot corresponding to the bending plate 122 is opened on the top side wall of the scraper crystallizer 1, which can limit the support plate 121 and prevent it from rotating on its own.

[0037] See also Figures 1 to 7 Preferably, the belt drive in the present invention is a mature existing technology. The user can select a pulley of appropriate size for auxiliary transmission according to actual conditions, or use a chain drive to replace the belt drive. The sprocket installation and the coordination of the sprocket and the chain involved are all conventional technical operations, so they will not be repeated in the present invention.

[0038] See also Figures 1 to 7 Preferably, the driving member 123 is a rotating motor that can provide sufficient power.

[0039] See also Figures 1 to 7 Preferably, a slag bucket 7 is provided below the scraper crystallizer 1 for containing slag.

[0040] During the implementation of the present invention: the desulfurization wastewater passes through the triple box and enters the evaporation concentrator 3 through the raw liquid inlet. If there is no raw liquid in the scraped wall crystallizer 1 at this time, the raw liquid can be added to the scraped wall crystallizer 1 through the replenishing pipe 33, and then the steam inlet regulating valve group 21 is opened, and high-temperature steam is introduced into the steam jacket 2. The steam jacket 2 heats the wastewater in the scraped wall crystallizer 1. At this time, the jet water pump 63 and the jet vacuum pump 62 are started, and a negative pressure environment is formed inside each mechanism of the device. The wastewater in the scraped wall crystallizer 1 reaches the boiling point under the negative pressure environment, the wastewater boils and generates steam, and the steam enters the preheater 31, heating the wastewater in the preheater 31 and the evaporation concentrator 3 to evaporate it. The circulation pump 32 is started to drive the wastewater to circulate continuously in the preheater 31 and the evaporation concentrator 3 until the concentration reaches a certain threshold, and the concentrated liquid is discharged into the scraped wall crystallizer 1 for evaporation and crystallization. The secondary steam from the evaporation concentrator 3 and the preheater 31 enters the steam condenser 4, which condenses the secondary steam. The condensed water enters the intermediate barrel 5. The intermediate barrel 5 serves as a link between the device and the outside world. Through the orderly opening and closing of the valve groups, the internal vacuum of the device is maintained and the condensed water is smoothly discharged. The specific operation process is as follows: Close the drain valve 54, drain pressure balancing valve 55, the valve block on the steam condenser condensate drain pipe 42, the valve block on the preheater condensate drain pipe 36, the steam condenser drain balancing valve 51, and the preheater drain balancing valve 52. When the condensate in the preheater 31 reaches a certain level, open the valve block on the preheater condensate drain pipe 36 and the preheater drain balancing valve 52 to drain the condensate in the preheater 31 into the intermediate drum 5. When the condensate level in the preheater 31 falls below the set value, close the valve block on the preheater condensate drain pipe 36 and the preheater drain balancing valve 52.

[0041] When the liquid level in the steam condenser 4 reaches the set value, the valve group on the steam condenser condensation drain pipe 42 and the steam condenser drainage balancing valve 51 are opened to drain the condensed water in the steam condenser 4 to the intermediate barrel 5. When the liquid level in the steam condenser 4 is lower than the set value, the valve group on the steam condenser condensation drain pipe 42 and the steam condenser drainage balancing valve 51 are closed.

[0042] When the liquid level in the intermediate barrel 5 reaches the set value, keep the valve group on the steam condenser condensate drain pipe 42, the valve group on the preheater condensate drain pipe 36, the steam condenser drain balancing valve 51 and the preheater drain balancing valve 52 in the closed state, open the drain valve 54 and the drain pressure balancing valve 55, and discharge the condensed water in the intermediate barrel 5 to the condensate tank 6. The condensed water in the condensate tank 6 is used by the jet water pump 63.

[0043] During the use of the scraper crystallizer 1 of the present invention, the top electromagnet 135 applies a repulsive force to the top magnetic part 134, so that the two clamping rings 133 abut against each other, and the two first sliders are respectively located in the two slide grooves. At this time, the rotating shaft 12 can drive the fixed frame plate 131 and the buoyancy seat 13 to rotate synchronously, and the reciprocating seat 171 is located at the bottom of its motion range. The side scraper 141 scrapes off the crystals attached to the inner wall of the scraper crystallizer 1. When the side scraper 141 needs to be replaced, the top electromagnet 135 applies an attractive force to the top magnetic part 134, so that the two clamping rings 133 is away from the rotating shaft 12, and the first slider no longer cooperates with the slide groove. At this time, the rotating shaft 12 drives the sliding sleeve 17 to rotate, and the sliding sleeve 17 and the buoyancy seat 13 rotate relative to each other (under the gravity of the buoyancy seat 13, the fixed frame plate 131 and the guide rail 136, the buoyancy seat 13 is stationary or can only rotate slowly). Under the action of the reciprocating groove, the reciprocating seat 171 rises along the sliding sleeve 17, thereby driving the active frame 15 and the driven frame 16 to move in the direction close to the rotating shaft 12. When the driven slide abuts against the end side of the limit groove close to the rotating shaft 12, When the wall is reached, the active frame 15 continues to move, so that the active frame 15 and the driven frame 16 approach each other. At this time, the side scraper 141 is disengaged from the through groove, and the guide post enters at one end of one of the guide grooves 1421. When the guide post moves to the middle of the guide groove 1421, the reciprocating seat 171 reaches the highest point of its motion range, and then the sliding sleeve 17 continues to rotate, and the reciprocating seat 171 descends. Since the turntable 142 has a certain amount of inertia, the guide post is disengaged at the other end of the above-mentioned guide groove 1421, and then the active frame 15 is reset, and the through groove is aligned with the side scraper 141 to be used. 41 cooperates to drive the turntable 142 to rotate a certain angle, so that the end of the other guide groove 1421 close to the above-mentioned guide groove 1421 is aligned with the guide column, and then the top electromagnet 135 applies a repulsive force to the top magnetic part 134 again to make the retaining rings 133 move closer to each other (if the first slider and the slide groove do not correspond to each other, the top electromagnet 135 applies a repulsive force to the top magnetic part 134, and the rotating shaft 12 rotates to complete the cooperation between the first slider and the slide groove), and the rear scraper 141 is replaced to continue cleaning the inner wall of the scraper crystallizer 1.

[0044] When the bottom scraper 181 needs to be replaced, the bottom electromagnet 182 applies an attractive force to the bottom magnetic part 19, causing the bottom magnetic part 19 to move downward for a distance. Since the bottom scraper 181 in use at this time has already abutted against the bottom surface of the scraper crystallizer 1, the bottom scraper 181 does not move, and the bottom connecting rod 185 is slightly deformed. Then the shaft 12 drives the bottom magnetic part 19 to rotate until the extension part 192 does not correspond to the adjustment part 183, and then the bottom electromagnet 182 applies a repulsive force to the bottom magnetic part 19, causing the adjustment part 183 to move downward. It resets itself, and the bottom scraper 181 corresponding to the above-mentioned adjustment member 183 rotates until it does not abut against the bottom surface of the scraper crystallizer 1 (when the second compression spring is in a natural state and the buoyancy seat 13 is located at the bottom end of the scraper crystallizer 1, since the horizontal height of the bottom end of the active frame 15 is lower than the horizontal height of the bottom end of the buoyancy seat 13, an avoidance space can be formed between the buoyancy seat 13 and the bottom surface of the scraper crystallizer 1, and the bottom scraper 181 in an idle state rotates without interfering with the buoyancy seat 13, the active frame 15 and the driven frame 16). The rotating shaft 12 drives the bottom magnetic part 19 to rotate a certain angle, and then the bottom electromagnet 182 applies attraction to the bottom magnetic part 19, and the bottom magnetic part 19 moves downward, and the pressure seat 191 forces the corresponding adjustment part 183 downward, thereby driving the bottom scraper 181 corresponding to the above-mentioned adjustment part 183 to abut against the bottom surface of the scraper crystallizer 1, and the rotating shaft 12 rotates, and the extension part 192 reaches the bottom end of the adjacent adjustment part 183. At this time, the bottom electromagnet 182 applies a repulsive force to the bottom magnetic part 19. Under the action of the extension part 192 and the telescopic shaft 184 (at this time the telescopic shaft 184 reaches its maximum extension length), the bottom magnetic part 19 cannot rise, so that the extension part 192 is in stable contact with the adjustment part 183, so that the rotating shaft 12 drives the base 18 to rotate stably.

[0045] The present invention provides a double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants, which has the following beneficial effects: By setting up components such as scraper crystallizer, evaporation concentrator and steam condenser, and adopting a double-effect series treatment process of crystallization drying and evaporation concentration, the steam generated in the scraper crystallization kettle is used to preheat the raw material liquid in the evaporation concentrator, thereby improving the utilization efficiency of steam.

[0046] By setting up structures such as a buoyancy seat, an active frame, a mounting shaft, a base and a bottom magnetic part, the side scrapers can be automatically adjusted according to the liquid level height, and the side scrapers and bottom scrapers can be automatically replaced, which extends the continuous operation time of the device without stopping for replacement, ensuring a good cleaning effect.

[0047] To sum up, the beneficial effects of this application are: it can not only adopt a dual-effect series treatment process of crystallization drying and evaporation concentration to improve the utilization efficiency of steam, but also can automatically replace the side scrapers and bottom scrapers without stopping the machine, thereby extending the continuous operation time of the device and ensuring a good cleaning effect.

[0048] Of course, the present invention may have multiple embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants, characterized in that: include: Scraped wall crystallizer, the outer cover of which is provided with a steam jacket; An evaporation concentrator is provided with a raw material liquid inlet at the top, a preheater is provided at the bottom of the evaporation concentrator, a circulation pump is provided at the bottom of the preheater, and a steam exhaust pipe is provided between the preheater and the scraped wall crystallizer; A steam condenser, a secondary steam exhaust pipe is connected between the steam condenser and the evaporation concentrator, and a preheater exhaust pipe is connected between the preheater and the secondary steam exhaust pipe; The middle barrel is connected to the steam condenser via a steam condenser condensation pipe, and the preheater is connected to the steam condenser condensation pipe via a preheater condensation pipe. A condensation water tank is connected to the steam condenser with a condensation exhaust pipe, and a drainage pipe is connected between the condensation water tank and the intermediate barrel. The condensation water tank is provided with a jet vacuum pump and a jet water pump, and a vacuum pump return pipe is connected between the jet water pump and the condensation water tank.

2. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 1 is characterized in that: Pipes are provided between the intermediate barrel and the preheater, and between the intermediate barrel and the steam condenser. A preheater drainage balancing valve is provided on the pipe between the intermediate barrel and the preheater, and a steam condenser drainage balancing valve is provided on the pipe between the intermediate barrel and the steam condenser.

3. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 1 is characterized in that: The jet water pump draws water from the condensate tank, pressurizes it, and quickly injects it into the jet vacuum pump. The jet vacuum pump is connected to the condensate tail gas exhaust pipe, thereby forming a negative pressure environment in the scraper crystallizer, evaporation concentrator, preheater, steam condenser and intermediate barrel.

4. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 1 is characterized in that: The scraper crystallizer is provided with a rotating shaft for rotation inside, a buoyancy seat is provided on the rotating shaft, a fixed frame plate is mounted above the buoyancy seat, two clamping rings are symmetrically slidably provided on the fixed frame plate, the two clamping rings abut against each other to form a circular ring slidably connected to the rotating shaft, a plurality of guide rails are evenly arranged around the circumference of the buoyancy seat, vertical avoidance grooves are provided on the guide rails, the avoidance grooves are provided with through grooves at one end away from the rotating shaft, and mounting shafts are provided in the avoidance grooves, and the mounting shafts are rotatably connected to the active frame, and the active frame is supported by A driven frame is elastically connected to one side of the near rotating shaft, and the active frame and the driven frame are both slidably connected to the guide rail. A number of side scrapers are evenly arranged on the mounting shaft, a turntable is provided at the top of the mounting shaft, a number of guide grooves are provided on the turntable, and a guide column is provided on the driven frame that cooperates with the guide groove. A sliding sleeve is provided between the fixed frame plate and the buoyancy seat and is arranged on the outside of the rotating shaft. A reciprocating seat is provided on the sliding sleeve, and a center plate passing through the driven frame is provided on the active frame, and a top connecting rod is rotatably provided between the reciprocating seat and the center plate.

5. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 4 is characterized in that: A base is rotatably provided at the bottom end of the rotating shaft, and a plurality of bottom scrapers are evenly arranged around the circumference of the base. The bottom scrapers are all rotatably connected to the base, and a bottom electromagnet is provided on the top surface of the base. Adjusting parts corresponding to the bottom scrapers are elastically connected above the base, and bottom connecting rods are rotatably connected between the corresponding adjusting parts and the bottom scrapers. A bottom magnetic part is slidably provided on the rotating shaft above the adjusting part, and at least one pressure seat corresponding to the adjusting part is provided on the bottom magnetic part.

6. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 4 is characterized in that: The top surface of one end of the clamping ring away from the rotating shaft is fixedly connected with a top magnetic member, and the fixing frame plate on one side of the clamping ring away from the rotating shaft is fixedly connected with a top electromagnet.

7. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 4 is characterized in that: The through slot is not located at the center of the end of the guide rail, and a chamfer that cooperates with the side scraper is opened on the side wall of the through slot. When the side scraper passes through the through slot, it drives the turntable to rotate.

8. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 4 is characterized in that: Active slides are provided on both end side walls of the active frame, and driven slides are provided on both end side walls of the driven frame. Limiting grooves cooperating with the active slides and the driven slides are provided on both side walls of the avoidance groove.

9. The double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants according to claim 5, characterized in that: An extension piece is provided at the bottom end of the side wall of the pressure seat located in front of the rotating direction of the rotating shaft.

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