Dual-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plant

Abstract

The application is suitable for the technical field of wastewater treatment, and provides a double-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants, which comprises a wall scraping crystallizer, the outside of which is provided with a steam jacket; an evaporation concentrator, the bottom end of which is provided with a preheater, and the bottom of the preheater is provided with a circulating pump; a steam condenser, which is connected with the evaporation concentrator through a secondary steam discharge pipe, and the preheater is connected with the secondary steam discharge pipe through a preheater steam discharge pipe; an intermediate barrel, which is connected with the steam condenser through a steam condenser condensate discharge pipe; a condensate water tank, which is connected with the steam condenser through a condensate gas discharge pipe, and is provided with a jet vacuum pump and a jet water pump. Therefore, the application can adopt a double-effect series treatment process of crystallization drying and evaporation concentration, improve the utilization efficiency of steam, and automatically replace the side scraper and the bottom scraper without stopping the machine, thereby prolonging the continuous operation time of the device and ensuring good cleaning effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants. BACKGROUND

[0002] Coal-fired power generation is the main power generation method at the present stage in China, and coal will produce flue gas containing a large amount of SO2 in the combustion process and cause air pollution, so it is necessary to adopt a suitable flue gas desulfurization method to achieve standard emission of flue gas. At present, the desulfurization wastewater is treated by a neutralization-chemical precipitation-flocculation-settling process, and the produced water quality cannot meet the current environmental protection requirements.

[0003] In view of the above problems, the prior art has been improved by those skilled in the art, for example, a kind of desulfurization wastewater concentration, evaporation and crystallization integrated zero discharge treatment system is disclosed in Chinese patent CN109179538B, which comprises a concentration evaporator, a steam compressor, a steam storage device, an evaporation heat exchange surface, a steam condensate storage device, a water vapor separation tank and a natural circulation heating device connected in circulation. The evaporation heat exchange surface is located in the concentration evaporator, its upper end extends out of the concentration evaporator and is connected with the steam storage device located on the top surface of the concentration evaporator, and its lower end is connected with the steam condensate storage device located in the concentration evaporator. The lower part of the concentration evaporator is a desulfurization wastewater part, and the upper part is a low-temperature steam part. The low-temperature steam in the low-temperature steam part is sucked into the steam compressor through a first pipeline, and is pressurized and heated in the steam compressor to form high-pressure high-temperature steam. The temperature difference between the low-temperature steam and the high-pressure high-temperature steam is 8-10℃. The system can realize the concentration and crystallization of desulfurization wastewater, but in the above treatment system, the concentration and evaporation crystallization of desulfurization wastewater are carried out by the same device, which leads to a long time required for single operation and still has inconvenience in use.

[0004] From the above, it is obvious that the prior art has disadvantages and defects in actual use, so it is necessary to improve. SUMMARY

[0005] In view of the above defects, the purpose of the present application is to provide a double-effect coupled desulfurization wastewater zero-discharge treatment device for coal-fired power plants, which can adopt a crystallization drying and evaporation concentration double-effect series treatment process to improve the utilization efficiency of steam, and can automatically replace the side scraper and the bottom scraper without stopping the machine, thereby prolonging the continuous running time of the device and ensuring good cleaning effect.

[0006] In order to achieve the above object, the present application provides a coal-fired power plant double-effect coupled desulfurization wastewater zero discharge treatment device, comprising: a wall scraping crystallizer, which is externally sleeved with a steam jacket; an evaporation concentrator, which is provided with a raw material liquid inlet at the top, and is provided with a preheater at the bottom end, and the bottom of the preheater is provided with a circulating pump, and a steam exhaust pipe is arranged between the preheater and the wall scraping crystallizer; a steam condenser, which is connected with the evaporation concentrator through a secondary steam exhaust pipe, and the preheater is connected with the secondary steam exhaust pipe through a preheater steam exhaust pipe; an intermediate barrel, which is connected with the steam condenser through a steam condenser condensate exhaust pipe, and the preheater is connected with the steam condenser condensate exhaust pipe through a preheater condensate exhaust pipe; a condensate tank, which is connected with the steam condenser through a condensate exhaust pipe, and is connected with the intermediate barrel through a drainage pipeline, and is provided with a jet vacuum pump and a jet water pump; and the jet water pump is connected with the condensate tank through a vacuum pump water return pipe.

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

[0008] According to the coal-fired power plant double-effect coupled desulfurization wastewater zero discharge treatment device of the present application, the jet water pump draws water in the condensate tank, and after being pressurized, it is quickly injected into the jet vacuum pump, the jet vacuum pump is connected with the condensate exhaust pipe, thereby forming a negative pressure environment in the wall scraping crystallizer, the evaporation concentrator, the preheater, the steam condenser and the intermediate barrel.

[0009] According to the coal-fired power plant double-effect coupled desulfurization wastewater zero discharge treatment device of the present application, a rotating shaft is arranged inside the wall scraping crystallizer, a buoyancy seat is sleeved on the rotating shaft, a fixed frame plate is arranged above the buoyancy seat, two clamping rings are symmetrically arranged on the fixed frame plate, the two clamping rings abut against each other to form a circular ring which is in sliding connection with the rotating shaft, a plurality of guide rails are uniformly arranged around the buoyancy seat, vertical avoidance grooves are formed in the guide rails, slots are formed at the ends of the avoidance grooves away from the rotating shaft, mounting shafts are arranged in the avoidance grooves, the mounting shafts are rotatably connected to driving frames, elastic driving frames are arranged on the sides of the driving frames close to the rotating shaft, the driving frames and the elastic driving frames are in sliding connection with the guide rails, a plurality of side scraping plates are uniformly arranged on the mounting shafts, rotating discs are arranged at the top ends of the mounting shafts, a plurality of guide grooves are arranged on the rotating discs, guide columns matched with the guide grooves are arranged on the elastic driving frames, a sliding shaft sleeve is arranged outside the rotating shaft and in sliding connection with the fixed frame plate and the buoyancy seat, a reciprocating seat is arranged on the sliding shaft sleeve, center plates are arranged on the driving frames and the elastic driving frames, and top connecting rods are rotatably arranged between the reciprocating seats and the center plates.

[0010] The bottom end of the rotating shaft is rotationally provided with a base, the periphery of the base is uniformly annularly provided with a plurality of bottom scrapers, the bottom scrapers are all rotationally connected to the base, the top surface of the base is provided with a bottom electromagnet, the base is elastically connected with an adjusting piece corresponding to the bottom scraper above the base, a bottom connecting rod is rotationally connected between the corresponding adjusting piece and the bottom scraper, a bottom magnetic piece is slidably arranged on the rotating shaft above the adjusting piece, and at least one pressing seat corresponding to the adjusting piece is arranged on the bottom magnetic piece.

[0011] The end surface of the clamping ring away from the rotating shaft is fixedly connected with a top magnetic piece, and the fixed frame plate on the side of the clamping ring away from the rotating shaft is fixedly connected with a top electromagnet.

[0012] The through slot is not located at the center of the end of the guide rail, a chamfer matched with the side scraper is formed in the side wall of the through slot, and the side scraper drives the rotating disc to rotate when passing through the through slot.

[0013] The two end side walls of the driving frame are both provided with a driving sliding plate, the two end side walls of the driven frame are both provided with a driven sliding plate, and a limiting groove matched with the driving sliding plate and the driven sliding plate is formed in the two side walls of the avoiding slot.

[0014] The bottom end of the side wall of the pressing seat located in front of the rotating direction of the rotating shaft is provided with an extension piece.

[0015] The purpose of the present application is to provide a coal-fired power plant double-effect coupled desulfurization wastewater zero discharge treatment device, which has the following advantages:

[0016] By setting the wall scraping crystallizer, the evaporation concentrator and the steam condenser and other components, the crystallization drying and evaporation concentration double-effect series treatment process is adopted, the steam generated in the scraping crystallizer is used for preheating of the raw material liquid in the evaporation concentrator, and the utilization efficiency of the steam is improved.

[0017] By setting the buoyancy seat, the driving frame, the mounting shaft, the base and the bottom magnetic piece and other structures, the side scraper can be automatically adjusted according to the liquid level height, the side scraper and the bottom scraper can be automatically replaced, the continuous operation time of the device is prolonged, the device does not need to be stopped for replacement, and good cleaning effect is ensured.

[0018] In summary, the present application has the following advantages: the crystallization drying and evaporation concentration double-effect series treatment process can be adopted to improve the utilization efficiency of the steam, the side scraper and the bottom scraper can be automatically replaced without stopping, the continuous operation time of the device is prolonged, and good cleaning effect is ensured. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the connection relationships between the various mechanisms of the present invention;

[0020] Figure 2 This is a schematic diagram of the wall-scraping crystallizer structure;

[0021] Figure 3 yes Figure 2 Front sectional view;

[0022] Figure 4 This is a schematic diagram of the internal structure of a wall-scraping crystallizer;

[0023] Figure 5 This is a schematic diagram of the structure at the buoyancy seat;

[0024] Figure 6 This is a top-down enlarged view of the turntable.

[0025] Figure 7 This is a structural diagram of the base.

[0026] In the diagram: 1-Wall scraping crystallizer, 11-Top cover, 12-Rotating shaft, 121-Support plate, 122-Bending plate, 123-Driving component, 13-Buoyancy seat, 131-Fixed frame plate, 132-Bracket, 133-Snap ring, 134-Top magnetic component, 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 bushing, 171-Reciprocating seat, 172-Top connecting rod, 18-Base, 181-Bottom scraper, 182-Bottom electromagnet, 183-Adjusting component, 184-Telescopic shaft, 185-Bottom connecting rod, 19-Bottom magnetic component, 191-Pressure seat, 192- 1. Extension component; 2. Steam jacket; 21. Steam inlet regulating valve assembly; 22. Condensate drain valve assembly; 3. Evaporator concentrator; 31. Preheater; 32. Circulating pump; 33. Makeup pipe; 34. Steam manifold; 35. Secondary steam manifold; 36. Preheater condensate manifold; 37. Preheater exhaust pipe; 4. Steam condenser; 41. Condensate tail gas manifold; 42. Steam condenser condensate manifold; 43. Cooling water outlet; 44. Cooling water inlet; 5. Intermediate tank; 51. Steam condenser drain balance valve; 52. Preheater drain balance valve; 53. Drain valve; 54. Drain valve; 55. Drain pressure balance valve; 6. Condensate tank; 61. Vacuum pump return water pipe; 62. Jet vacuum pump; 63. Jet water pump; 7. Slag bucket. Detailed Implementation

[0027] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0028] Referring to Figures 1-7 The present application provides a double-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants, comprising:

[0029] The wall scraping crystallizer 1 is externally provided with a support mechanism (not shown in the figure), which can be a support frame, a support leg or the like. This is a prior art and will not be described in detail. The wall scraping crystallizer 1 is externally provided with a steam jacket 2, which is fixedly connected with the wall scraping crystallizer 1. Two pipes are fixedly connected with the steam jacket 2. One of the pipes is connected with the steam inlet adjusting valve group 21 and the other pipe is connected with the condensate trap valve group 22. The pipe connected with the steam inlet adjusting valve group 21 is used to input high-temperature steam into the steam jacket 2, which is used to provide heat for the wall scraping crystallizer 1 to realize the evaporation and crystallization of the concentrated liquid in the wall scraping crystallizer 1. The pipe connected with the condensate trap valve group 22 is used to discharge the condensed water in the steam jacket 2.

[0030] The evaporation concentrator 3 is fixedly connected with a raw material liquid inlet at the top. The desulfurization wastewater is treated by a triple tank (i.e. a neutralization tank, a reaction tank and a flocculation tank, which are prior arts and will not be described in detail) and then enters the evaporation concentrator 3 at the raw material liquid inlet. The evaporation concentrator 3 is fixedly connected with a preheater 31 at the bottom. The preheater 31 is used to preheat the raw material liquid. The bottom of the preheater 31 is fixedly provided with a circulating pump 32, which is used to drive the raw material liquid to circulate between the preheater 31 and the evaporation concentrator 3. The preheater 31 is connected with a steam discharge pipe 34 with the wall scraping crystallizer 1. The steam generated in the wall scraping crystallizer 1 enters the preheater 31 through the steam discharge pipe 34. When the raw material liquid circulates between the preheater 31 and the evaporation concentrator 3, the steam can heat the raw material liquid. 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. The evaporation concentrator 3 is also fixedly connected with a supplement pipe 33 with the wall scraping crystallizer 1. The supplement pipe 33 is used to discharge the concentrated liquid in the evaporation concentrator 3 into the wall scraping crystallizer 1.

[0031] The steam condenser 4 is fixedly connected with a secondary steam discharge pipe 35 with the evaporation concentrator 3. The preheater 31 is fixedly provided with a preheater steam discharge pipe 37, which is in communication with the secondary steam discharge pipe 35. The secondary steam generated in the evaporation concentrator 3 can be discharged into the steam condenser 4. The steam condenser 4 is fixedly provided with a cooling water inlet 44 and a cooling water outlet 43. In order to control the temperature difference between the steam at the outlet of the evaporation concentrator 3 and the steam at the outlet of the wall scraping crystallizer 1, a pressure regulating valve is arranged on the preheater steam discharge pipe 37 to adjust the steam pressure difference at the outlets of the evaporation concentrator 3 and the wall scraping crystallizer 1.

[0032] The intermediate barrel 5 is communicated with the steam condenser 4 through the steam condenser condensing discharge pipe 42, the preheater 31 is fixedly connected with the preheater condensing discharge pipe 36 communicated with the steam condenser condensing discharge pipe 42, the intermediate barrel 5 and the preheater 31 are fixedly connected with the pipe, the intermediate barrel 5 and the steam condenser 4 are fixedly connected with the pipe, the pipe between the intermediate barrel 5 and the preheater 31 is provided with the preheater discharge water balance valve 52, and the pipe between the intermediate barrel 5 and the steam condenser 4 is provided with the steam condenser discharge water balance valve 51. The intermediate barrel 5 is fixedly connected with the blowdown valve 53 and the drain valve 54, the blowdown valve 53 is used for discharging impurities in the intermediate barrel 5, and the drain valve 54 is used for discharging condensed water in the intermediate barrel 5. The intermediate barrel 5 is also fixedly connected with the drain pressure balance valve 55, which is used to balance the air pressure in the intermediate barrel 5 when discharging water.

[0033] The condensate tank 6 is connected with the steam condenser 4 through the condensing tail gas discharge pipe 41, and the condensate tank 6 is communicated with the intermediate barrel 5 through the drain pipe, and the drain valve 54 is fixedly connected to the drain pipe. The condensate tank 6 is fixedly installed with the jet vacuum pump 62 and the jet water pump 63, the jet water pump 63 is communicated with the condensate tank 6 through the vacuum pump water return pipe 61, the jet water pump 63 pumps water in the condensate tank 6, and after being pressurized, it is quickly injected into the jet vacuum pump 62, and the jet vacuum pump 62 is communicated with the condensing tail gas discharge pipe 41, so that a negative pressure is formed in the wall scraping crystallizer 1, the evaporation concentrator 3, the preheater 31, the steam condenser 4 and the intermediate barrel 5.

[0034] As a further embodiment of the present application, the wall scraping crystallizer 1 comprises:

[0035] The top cover 11 is detachably connected to the top end of the wall scraping crystallizer 1, the connection between the top cover 11 and the wall scraping crystallizer 1 can be bolted, clamped or the like, and the connection between the top cover 11 and the wall scraping crystallizer 1 is sealed, the bottom of the wall scraping crystallizer 1 is in the form of an inverted truncated cone, which facilitates the discharge of crystallized materials, and the bottom end of the wall scraping crystallizer 1 is provided with an opening, and the opening is provided with a hatch that can be opened and closed automatically. The structure and driving mode of the hatch are known to those skilled in the art, and therefore will not be described herein.

[0036] The rotating shaft 12 is rotatably arranged in the wall scraping crystallizer 1, the top end of the rotating shaft 12 is rotatably connected to the supporting plate 121, and the rotating shaft 12 and the supporting plate 121 are further connected by bearings or bushings or the like. The supporting plate 121 is lapped on the top surface of the wall scraping crystallizer 1, the driving member 123 is fixedly installed on the supporting plate 121, the output shaft of the driving member 123 is connected to the rotating shaft 12 through a belt transmission, so that the driving member 123 can drive the rotating shaft 12 to rotate reciprocally, and the driving member 123 is externally protected (e.g. sealed protective shell) to avoid damage caused by steam. This is a prior art and will not be described herein.

[0037] The buoyancy seat 13 is sleeved on the rotating shaft 12, two sliding grooves are arranged on the surface of the rotating shaft 12, the fixed frame plate 131 is arranged above the buoyancy seat 13, a plurality of supports 132 are fixedly connected to the top surface of the buoyancy seat 13, the fixed frame plate 131 is symmetrically provided with two clamping rings 133, the clamping rings 133 are semicircular rings, and the two clamping rings 133 are symmetrically arranged with respect to the axis of the rotating shaft 12, the clamping rings 133 are slidingly connected to the top surface of the fixed frame plate 131, that is, two connecting grooves are arranged on the top surface of the fixed frame plate 131, a connecting block provided in the connecting groove is fixedly connected to the clamping ring 133, and the connecting block and the connecting groove are in one-to-one correspondence. The first sliding block is fixedly connected to the inner wall of the clamping ring 133, when the two ends of the two clamping rings 133 abut against each other, a circular ring can be formed, at this time, the two first sliding blocks are located in the two sliding grooves respectively, so that the rotating shaft 12 can drive the buoyancy seat 13 to rotate synchronously. The top surface of one end of the clamping ring 133 away from each other is fixedly connected with a top magnetic piece 134, the top surface of the fixed frame plate 131 away from the rotating shaft 12 on the side of the clamping ring 133 is fixedly connected with a top electromagnet 135, by changing the direction of the force (attractive force or repulsive force) exerted by the top electromagnet 135 on the top magnetic piece 134, the position of the clamping ring 133 can be adjusted.

[0038] A plurality of vertical installation shafts 14 are uniformly arranged on the outer 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 installation shaft 14 and the guide rail 136 are in one-to-one correspondence, the guide rail 136 is provided with an avoiding groove penetrating in the vertical direction, the avoiding groove is arranged at one end of the guide rail 136 away from the rotating shaft 12, and a through groove is arranged on the side wall of the end of the avoiding groove away from the rotating shaft 12. The installation shaft 14 is rotatably connected to the driving frame 15, the driving frame 15 is in an arch shape, the bottom end of the installation shaft 14 is rotatably connected to the bottom surface of the driving frame 15, the top end of the installation shaft 14 penetrates through the top surface of the driving frame 15, and the installation shaft 14 and the driving frame 15 are further connected through a bearing or a bushing. A plurality of side scrapers 141 are uniformly arranged on the side wall of the installation shaft 14, the side scrapers 141 are fixedly connected to the installation shaft 14, and the side scrapers 141 can penetrate through the through groove and abut against the inner side wall of the scraped wall crystallizer 1. The driving frame 15 is fixedly connected with a driving slide plate on the two side walls, the side wall of the avoiding groove is provided with a limiting groove corresponding to the driving slide plate, and the driving frame 15 can slide along the guide rail 136 through the sliding connection of the driving slide plate and the limiting groove.

[0039] The driven frame 16 is arranged on the side of the driving frame 15 close to the rotating shaft 12, a plurality of first compression springs are arranged between the adjacent driving frame 15 and driven frame 16, the two side walls of the driven frame 16 are fixedly connected with driven sliding plates matched with the limiting grooves. The top end of the driven frame 16 extends above the driving frame 15 and is bent towards the driving frame 15, the bending area is in a horizontal state, and the bottom surface of the bending area is fixedly connected with a guide column. The top end of the mounting shaft 14 penetrates through the top surface of the driving frame 15 and is fixedly connected with a rotating disc 142, a plurality of guide grooves 1421 corresponding to the guide column are formed in the top surface of the rotating disc 142, the guide grooves 1421 correspond to the side scrapers 141 one by one, the guide grooves 1421 are arc-shaped grooves symmetrically arranged with the centers of the side scrapers 141, the end portions of the adjacent guide grooves 1421 are close to each other but not communicated, the penetration hole is not located at the center of the end of the guide rail 136, that is, there is a certain offset distance between the penetration hole and the center of the end of the guide rail 136, and a chamfer matched with the side scraper 141 is formed in the penetration hole, when the side scraper 141 penetrates through the penetration hole, under the action of the penetration hole, the rotating disc 142 can be driven to rotate by a certain angle.

[0040] The sliding shaft sleeve 17 is arranged between the fixed frame plate 131 and the buoyancy seat 13, the two ends of the sliding shaft sleeve 17 are rotatably connected to the bottom surface of the fixed frame plate 131 and the top surface of the buoyancy seat 13, and the sliding shaft sleeve 17 is further connected between the fixed frame plate 131 and the buoyancy seat 13 through a bearing or a bushing, or the two ends of the sliding shaft sleeve 17 abut against the fixed frame plate 131 and the buoyancy seat 13, respectively. The sliding shaft sleeve 17 is slidably sleeved on the rotating shaft 12, a second sliding block arranged in the sliding groove is fixedly connected to the inner side wall of the sliding shaft sleeve 17, so that the sliding shaft sleeve 17 can rotate synchronously with the rotating shaft 12. The sliding shaft sleeve 17 is provided with a reciprocating seat 171, and a reciprocating groove matched with the reciprocating seat 171 is arranged on the surface of the sliding shaft sleeve 17, which can refer to the reciprocating screw rod for structure, the reciprocating seat 171 is provided with a reciprocating guide column matched with the reciprocating groove, and a plurality of limiting rods penetrating through the reciprocating seat 171 are fixedly connected between the fixed frame plate 131 and the buoyancy seat 13, when the sliding shaft sleeve 17 rotates in one direction, the reciprocating seat 171 can be driven to reciprocate along the sliding shaft sleeve 17. The side wall of the driving frame 15 close to the rotating shaft 12 is fixedly connected with a center plate 151 penetrating through the driven frame 16, the center plate 151 and the driven frame 16 can move relative to each other, and a top connecting rod 172 is rotatably arranged 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, and the top connecting rod 172 is further hinged between the center plate 151 and the reciprocating seat 171, which can be connected through a pin shaft or a hinge.

[0041] The base 18 is arranged at the bottom of the rotating shaft 12, and the base 18 is rotationally connected with the rotating shaft 12, and further, the base 18 is connected with the rotating shaft 12 through a bearing or a bushing, and a plurality of bottom scrapers 181 are uniformly and annularly arranged on the periphery of the base 18, and the bottom scrapers 181 are rotationally connected with the base 18, and further, the bottom scrapers 181 are hingedly connected with the base 18, such as pin hinged connection or hinge connection. The bottom electromagnet 182 is fixedly installed on the top surface of the base 18, and a plurality of adjusting members 183 are uniformly and annularly arranged above the base 18, and the adjusting members 183 correspond to the bottom scrapers 181 one by one, and the bottom connecting rods 185 are rotationally connected between the adjacent adjusting members 183 and the bottom scrapers 181, that is, one end of the bottom connecting rod 185 is rotationally connected with the adjusting member 183, and the other end of the bottom connecting rod 185 is rotationally connected with the bottom scraper 181, and further, the bottom connecting rod 185 is hingedly connected between the adjusting member 183 and the bottom connecting rod 185, and between the bottom scraper 181 and the bottom connecting rod 185, such as pin hinged connection or hinge connection. A plurality of telescopic shafts 184 are arranged between the adjusting member 183 and the base 18, and the telescopic shaft 184 comprises an inner shaft and an outer shaft, wherein the outer shaft is fixedly connected with the base 18, the inner shaft is fixedly connected with the adjusting member 183, the inner shaft is arranged in the inner part of the outer shaft, and the second compression spring is arranged between the inner shaft and the outer shaft, and when the second compression spring is in a natural state, the bottom scraper 181 is not in contact with the bottom surface of the scraped-wall crystallizer 1.

[0042] The bottom magnetic member 19 is arranged above the base 18 and is slidably sleeved on the outer part of the rotating shaft 12, and the third sliding block fixedly connected with the bottom magnetic member 19 is arranged in the sliding groove, so that the bottom magnetic member 19 can rotate synchronously with the rotating shaft 12. At least one pressing seat 191 is fixedly connected with the bottom magnetic member 19, and the number of the pressing seats 191 is less than the number of the adjusting members 183.

[0043] Referring to Figures 1-7 Preferably, the hollow cavity is arranged in the buoyant seat 13, so that sufficient buoyancy support can be provided.

[0044] Referring to Figures 1-7 Preferably, when the reciprocating seat 171 is located at the bottom end of the movement range, the side scraper 141 abuts against the inner side wall of the scraped-wall crystallizer 1, and when the bottom magnetic member 19 approaches the bottom end of the movement range, the bottom scraper 181 abuts against the bottom surface of the scraped-wall crystallizer 1, and the bottom connecting rod 185 is made of a hard material that can slightly deform, such as spring steel, PEEK or polyformaldehyde.

[0045] Referring to Figures 1-7 Preferably, the elongated member 192 is fixedly connected with the side wall of the pressing seat 191 at the bottom end of the rotating direction of the rotating shaft 12, and the elongated member 192 can correspond to the adjusting member 183, so that the pressing seat 191 and the adjusting member 183 can be matched during the rotation of the rotating shaft 12.

[0046] Referring to Figures 1-7Preferably, the bottom surface of the support plate 121 is fixedly connected with a bent plate 122 at both ends, and a clamping groove corresponding to the bent plate 122 is formed in the top side wall of the wall-scraping crystallizer 1, so that the support plate 121 can be limited and prevented from rotating by itself.

[0047] Referring to Figures 1-7 Preferably, the belt transmission in the application is a mature prior art, and a user can select a belt pulley with a proper size for auxiliary transmission according to actual conditions, or chain transmission can be used to replace the belt transmission, wherein the chain wheel installation and the cooperation between the chain wheel and the chain are conventional technical operations, so that the application will not be described in detail.

[0048] Referring to Figures 1-7 Preferably, the driving member 123 is a rotary motor, which can provide sufficient power.

[0049] Referring to Figures 1-7 Preferably, a slag bucket 7 is arranged below the wall-scraping crystallizer 1 and used for containing slag.

[0050] In the implementation process of the application, the desulfurization wastewater enters the evaporation concentrator 3 through the raw material liquid inlet after the triple box, if there is no raw material liquid in the wall-scraping crystallizer 1 at this time, the raw material liquid can be added into the wall-scraping crystallizer 1 through the supplement pipe 33, then the steam adjusting valve group 21 is opened, high-temperature steam is introduced into the steam jacket 2, the steam jacket 2 warms the wastewater in the wall-scraping crystallizer 1, at this time, the jet water pump 63 and the jet vacuum pump 62 are started, a negative pressure environment is formed in each mechanism of the device, the wastewater in the wall-scraping crystallizer 1 reaches the boiling point under the negative pressure environment, the wastewater boils and generates steam, the steam enters the preheater 31, heats the wastewater in the preheater 31 and the evaporation concentrator 3, and makes the wastewater evaporate, the circulating pump 32 is started, and the wastewater is continuously circulated in the preheater 31 and the evaporation concentrator 3, until the concentration reaches a certain threshold, the concentrated liquid is discharged into the wall-scraping crystallizer 1 for evaporation crystallization. The secondary steam from the evaporation concentrator 3 and the preheater 31 enters the steam condenser 4, the steam condenser 4 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 group, the internal vacuum degree of the device is maintained and the condensed water is smoothly discharged, and the specific operation process is as follows:

[0051] The drain valve 54, the drain pressure balance valve 55, the valve group on the steam condenser condensate drain 42, the valve group on the preheater condensate drain 36, the steam condenser drain balance valve 51 and the preheater drain balance valve 52 are closed. When the condensate in the preheater 31 reaches a certain level, the valve group on the preheater condensate drain 36 and the preheater drain balance valve 52 are opened to drain the condensate in the preheater 31 to the intermediate tank 5. When the condensate level in the preheater 31 is below a set value, the valve group on the preheater condensate drain 36 and the preheater drain balance valve 52 are closed.

[0052] When the level in the steam condenser 4 reaches a set value, the valve group on the steam condenser condensate drain 42 and the steam condenser drain balance valve 51 are opened to drain the condensate in the steam condenser 4 to the intermediate tank 5. When the level in the steam condenser 4 is below a set value, the valve group on the steam condenser condensate drain 42 and the steam condenser drain balance valve 51 are closed.

[0053] When the level in the intermediate tank 5 reaches a set value, the valve group on the steam condenser condensate drain 42, the valve group on the preheater condensate drain 36, the steam condenser drain balance valve 51 and the preheater drain balance valve 52 are kept closed, and the drain valve 54 and the drain pressure balance valve 55 are opened to drain the condensate in the intermediate tank 5 to the condensate tank 6, and the condensate in the condensate tank 6 is supplied to the jet water pump 63.

[0054] In use, the top electromagnet 135 applies repulsive force to the top magnetic piece 134, so that the two clamping rings 133 abut each other, and the two first sliding blocks are located in the two sliding grooves respectively, at this time, the rotating shaft 12 can drive the fixed frame plate 131 and the buoyancy base 13 to rotate synchronously, the reciprocating seat 171 is located at the bottom end of its movement range, and the side scraper 141 scrapes the crystalline substances attached to the inner wall of the wall scraping crystallizer 1, when the side scraper 141 needs to be replaced, the top electromagnet 135 applies attractive force to the top magnetic piece 134, so that the two clamping rings 133 are away from the rotating shaft 12, and the first sliding block is no longer matched with the sliding groove, at this time, the rotating shaft 12 drives the sliding shaft sleeve 17 to rotate, and the sliding shaft sleeve 17 and the buoyancy base 13 rotate relatively (under the action of the gravity of the buoyancy base 13, the fixed frame plate 131 and the guide rail 136 and the like, the buoyancy base 13 is static or can only rotate slowly), under the action of the reciprocating groove, the reciprocating seat 171 rises along the sliding shaft sleeve 17, so that the driving frame 15 and the driven frame 16 move towards the rotating shaft 12, when the driven sliding plate abuts against the side wall of one end of the limiting groove close to the rotating shaft 12, the driving frame 15 continues to move, so that the driving frame 15 and the driven frame 16 are close to each other, at this time, the side scraper 141 is disengaged from the through slot, and the guide column enters one end of the guide groove 1421, when the guide column moves to the middle of the guide groove 1421, the reciprocating seat 171 reaches the highest point of its movement range, then the sliding shaft sleeve 17 continues to rotate, and the reciprocating seat 171 descends, because the rotating disc 142 has a certain movement inertia, the guide column is disengaged from the other end of the guide groove 1421, then the driving frame 15 resets, the through slot is matched with the side scraper 141 to be used, the rotating disc 142 is driven to rotate by 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, then the top electromagnet 135 applies repulsive force to the top magnetic piece 134 again, so that the clamping rings 133 are close to each other (if the first sliding block does not correspond to the sliding groove, the rotating shaft 12 is rotated under the action of the repulsive force of the top electromagnet 135 to the top magnetic piece 134), and the replaced side scraper 141 continues to clean the inner wall of the wall scraping crystallizer 1.

[0055] 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 by a distance. Since the bottom scraper 181 in use has abutted the bottom surface of the wall scraping crystallizer 1 at this time, the bottom scraper 181 does not move, and the bottom connecting rod 185 is slightly deformed. Then the rotating shaft 12 drives the bottom magnetic part 19 to rotate to the position where the extension part 192 does not correspond to the adjusting part 183. Then the bottom electromagnet 182 applies a repulsive force to the bottom magnetic part 19, causing the adjusting part 183 to reset by itself, and the corresponding bottom scraper 181 rotates to the position where it does not abut the bottom surface of the wall scraping crystallizer 1 (when the second compression spring is in a natural state and the buoyant seat 13 is located at the bottom end of the wall scraping crystallizer 1, since the horizontal height of the bottom end of the driving frame 15 is lower than that of the bottom end of the buoyant seat 13, a clearance can be formed between the buoyant seat 13 and the bottom surface of the wall scraping crystallizer 1, and the bottom scraper 181 in the idle state does not interfere with the buoyant seat 13, the driving frame 15 and the driven frame 16). The rotating shaft 12 drives the bottom magnetic part 19 to rotate by a certain angle, and then the bottom electromagnet 182 applies an attractive force to the bottom magnetic part 19, causing the bottom magnetic part 19 to move downward. The pressing seat 191 forces the corresponding adjusting part 183 to move downward, thereby driving the bottom scraper 181 corresponding to the adjusting part 183 to abut the bottom surface of the wall scraping crystallizer 1. The rotating shaft 12 rotates, and the extension part 192 reaches the bottom end of the adjacent adjusting part 183. At this time, the bottom electromagnet 182 applies a repulsive force to the bottom magnetic part 19, and the bottom magnetic part 19 cannot rise due to the action of the extension part 192 and the telescopic shaft 184 (at this time, the telescopic shaft 184 reaches its maximum extension length), so that the extension part 192 stably contacts the adjusting part 183, thereby enabling the rotating shaft 12 to stably rotate the bottom seat 18.

[0056] The coal-fired power plant double-effect coupled desulfurization wastewater zero discharge treatment device has the beneficial effects that:

[0057] By arranging the wall scraping crystallizer, the evaporation concentrator and the steam condenser and the like components, and by adopting the crystallization drying and evaporation concentration double-effect series treatment process, the steam generated in the wall scraping crystallizer is used for preheating the raw material liquid in the evaporation concentrator, thereby improving the utilization efficiency of the steam.

[0058] By arranging the buoyant seat, the driving frame, the mounting shaft, the bottom seat and the bottom magnetic part and the like structures, the side scraper can automatically adjust according to the liquid level height, and the side scraper and the bottom scraper can be automatically replaced, thereby prolonging the continuous operation time of the device, eliminating the need for shutdown replacement, and ensuring good cleaning effect.

[0059] In summary, the device has the beneficial effects that: the crystallization drying and evaporation concentration double-effect series treatment process is adopted, the utilization efficiency of the steam is improved, the side scraper and the bottom scraper can be automatically replaced without shutdown, the continuous operation time of the device is prolonged, and good cleaning effect is ensured.

[0060] Of course, the present application also has various embodiments, and those skilled in the art can make corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications shall all belong to the protection scope of the claims attached to the present application.

Claims

1. A double-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants, characterized in that, The wall scraping crystallizer is externally sleeved with a steam jacket. The evaporation concentrator is provided with a raw material liquid inlet at the top, and is provided with a preheater at the bottom end, and the bottom of the preheater is provided with a circulating pump, and the preheater is provided with a steam exhaust pipe between the wall scraping crystallizer. The steam condenser is connected with the evaporation concentrator through a secondary steam exhaust pipe, and the preheater is connected with the secondary steam exhaust pipe through a preheater steam exhaust pipe. The intermediate barrel is connected with the steam condenser through a steam condenser condensate exhaust pipe, and the preheater is connected with the steam condenser condensate exhaust pipe through a preheater condensate exhaust pipe. The condensate tank is connected with the steam condenser through a condensate exhaust pipe, and is connected with the intermediate barrel through a drainage pipe, and is provided with a jet vacuum pump and a jet water pump, and the jet water pump is connected with the condensate tank through a vacuum pump water return pipe. The wall scraping crystallizer is internally provided with a rotating shaft, and the rotating shaft is sleeved with a buoyancy seat, and the upper part of the buoyancy seat is provided with a fixed frame plate, and two clamping rings are symmetrically arranged on the fixed frame plate, and the two clamping rings are in abutment to form a circular ring in sliding connection with the rotating shaft, and a plurality of guide rails are uniformly arranged around the buoyancy seat, and vertical avoiding grooves are formed in the guide rails, and a through groove is formed in one end of the avoiding groove away from the rotating shaft, and an installation shaft is arranged in the avoiding groove, and the installation shaft is rotatably connected to a driving frame, and a driven frame is elastically connected to one side of the driving frame close to the rotating shaft, and the driving frame and the driven frame are in sliding connection with the guide rails, and a plurality of side scrapers are uniformly arranged around the installation shaft, and a rotating disc is arranged at the top end of the installation shaft, and a plurality of guide grooves are arranged on the rotating disc, and a guide column matched with the guide grooves is arranged on the driven frame, and a sliding shaft sleeve is arranged in sliding connection with the outside of the rotating shaft between the fixed frame plate and the buoyancy seat, and a reciprocating seat is arranged on the sliding shaft sleeve, and a center plate penetrating through the driven frame is arranged on the driving frame, and a top connecting rod is rotatably arranged between the reciprocating seat and the center plate, and two sliding grooves are formed in the surface of the rotating shaft, and the two clamping rings are symmetrically arranged relative to the shaft center of the rotating shaft, and the clamping rings are in sliding connection with the top surface of the fixed frame plate, that is, two connecting grooves are formed in the top surface of the fixed frame plate, and a connecting block is fixedly connected to the clamping ring and arranged in the connecting groove, and the connecting blocks and the connecting grooves are in one-to-one correspondence, and a first sliding block is fixedly connected to the inner wall of the clamping ring, and when the two clamping ring ends are in abutment, a circular ring is formed, and at this time, the two first sliding blocks are located in the two sliding grooves, so that the rotating shaft drives the buoyancy seat to rotate synchronously, and a top magnetic part is fixedly connected to the top surface of the end of the clamping ring away from each other, and a top electromagnet is fixedly connected to the top surface of the fixed frame plate away from the rotating shaft, and the position of the clamping ring is adjusted by changing the direction of the force exerted by the top electromagnet on the top magnetic part. ​ The top end of the mounting shaft is fixedly connected with a rotating disc after penetrating through the top surface of the driving frame, the top surface of the rotating disc is provided with a plurality of guide grooves corresponding to the guide columns, the guide grooves correspond to the side scrapers one by one, the guide grooves are arc-shaped grooves symmetrically arranged with the center of the side scrapers, the end portions of adjacent guide grooves are close to each other but not communicated, the penetrating groove is not located at the center of the end of the guide rail, that is, there is a certain offset distance between the penetrating groove and the center of the end of the guide rail, and a chamfer cooperating with the side scraper is formed on the penetrating groove, when the side scraper penetrates through the penetrating groove, the rotating disc is driven to rotate by a certain angle under the action of the penetrating groove. Both ends of the driving frame are provided with driving sliding plates on the side walls, both ends of the driven frame are provided with driven sliding plates on the side walls, and both sides of the avoiding groove are provided with limiting grooves matched with the driving sliding plates and the driven sliding plates.

2. The dual-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants according to claim 1, characterized in that, The bottom end of the rotating shaft is rotatably provided with a base, a plurality of bottom scrapers are uniformly and annularly arranged on the circumference of the base, the bottom scrapers are rotatably connected to the base, the top surface of the base is provided with a bottom electromagnet, the base is elastically connected with adjusting members corresponding to the bottom scrapers, the adjusting members and the bottom scrapers are rotatably connected by bottom connecting rods, a bottom magnetic member is slidably arranged on the rotating shaft, the bottom magnetic member is provided with at least one pressing seat, the side wall of the pressing seat located in front of the rotating direction of the rotating shaft is provided with an extension piece, a plurality of telescopic shafts are arranged between the adjusting members and the base, each telescopic shaft comprises an inner shaft and an outer shaft, the inner shaft is arranged in the outer shaft, a second compression spring is arranged between the inner shaft and the outer shaft, when the second compression spring is in a natural state, the bottom scrapers are not in contact with the bottom surface of the wall scraping crystallizer, the rotating shaft drives the bottom magnetic member to rotate by a certain angle, then the bottom electromagnet applies an attractive force to the bottom magnetic member, the bottom magnetic member moves downward, the pressing seat forces the corresponding adjusting member to move downward, thereby driving the bottom scraper corresponding to the adjusting member to abut against the bottom surface of the wall scraping crystallizer, the rotating shaft rotates, the extension piece reaches the bottom end of the adjacent adjusting member, at this time, the bottom electromagnet applies a repulsive force to the bottom magnetic member, under the action of the extension piece and the telescopic shaft, the bottom magnetic member cannot rise, so that the extension piece and the adjusting member are in stable contact, thereby enabling the rotating shaft to stably rotate the base.

3. The dual-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants according to claim 1, characterized in that, Pipes are arranged between the intermediate cylinder and the preheater and between the intermediate cylinder and the steam condenser, a preheater discharge water balance valve is arranged on the pipe between the intermediate cylinder and the preheater, and a steam condenser discharge water balance valve is arranged on the pipe between the intermediate cylinder and the steam condenser.

4. The dual-effect coupled desulfurization wastewater zero discharge treatment device for coal-fired power plants according to claim 1, characterized in that, The jet flow water pump draws water in the condensate tank, and after pressurization, the jet flow water pump is quickly injected into the jet flow vacuum pump, the jet flow vacuum pump is connected with the condensate exhaust pipe, thereby forming a negative pressure environment in the wall scraping crystallizer, the evaporation concentrator, the preheater, the steam condenser and the intermediate cylinder.

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