CN214422456U - Triple-effect flash evaporation desulfurization wastewater treatment system - Google Patents
Triple-effect flash evaporation desulfurization wastewater treatment system Download PDFInfo
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- CN214422456U CN214422456U CN202122093453.1U CN202122093453U CN214422456U CN 214422456 U CN214422456 U CN 214422456U CN 202122093453 U CN202122093453 U CN 202122093453U CN 214422456 U CN214422456 U CN 214422456U
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Abstract
The application relates to a triple effect flash distillation desulfurization effluent disposal system includes: the system comprises a first flash unit, a second flash unit, a third flash unit and a processing unit; the first flash unit, the second flash unit and the third flash unit are sequentially communicated; the treatment unit comprises a fluoroplastic heat exchanger, a clarification tank and a plate-and-frame filter press; the wastewater is continuously evaporated and concentrated through the three flash evaporation units to form high-salt-content wastewater with higher temperature, and flows into the clarification tank, the condenser condenses flash evaporation steam which is not liquefied in the three flash evaporation units into condensed water which is used as a cold source of the fluoroplastic heat exchanger, and the fluoroplastic heat exchanger is arranged in the clarification tank, so that the saturated wastewater is cooled, crystallized salt is more sufficiently separated out, and the crystallized salt cannot be continuously separated out before and after the wastewater enters the plate and frame filter press, and the filter cloth of the plate and frame filter press, a filtrate water system, a pipeline and instrument measuring points of the pipeline are blocked.
Description
Technical Field
The application relates to the technical field of coal-fired wet electro-desulfurization wastewater treatment, in particular to a three-effect flash evaporation desulfurization wastewater treatment system.
Background
A large amount of sulfur-containing flue gas generated by a coal-fired power plant is treated by wet desulphurization, and a limestone-gypsum wet desulphurization process is the most widely used method in flue gas desulphurization engineering of the coal-fired power plant. The desulfurization wastewater generated by the process has the characteristics of high salt content, high suspended matter content, high hardness, strong corrosivity and the like, and can be discharged only by being treated.
At present, the mainstream process for treating the desulfurization wastewater in China adopts a low-temperature triple-effect concentration crystallization method, the low-temperature triple-effect concentration crystallization method is composed of three evaporators which are connected in series, the desulfurization wastewater is sequentially concentrated from a first effect to a third effect, supersaturation is achieved, crystallization is separated out, and solid-liquid separation of the desulfurization wastewater is realized. However, the concentrated desulfurization wastewater at the upper part of the clarification tank often blocks a plate-and-frame filter press system due to the precipitation of crystallized salt.
Disclosure of Invention
In view of this, this application has proposed a triple effect flash distillation desulfurization effluent disposal system, makes three group's flash distillation units operate in the form of establishing ties, and the waste water passes through three group's flash distillation units and evaporates constantly, improves the concentration of salt in the waste water and separates out the crystal salt to through set up fluoroplastics heat exchanger in the depositing reservoir, make the waste water of saturation cool down and separate out the crystal salt, can not continue to separate out the crystal salt after getting into the plate and frame filter press, cause the plate and frame filter press to block up.
According to one aspect of the application, a triple-effect flash evaporation desulfurization wastewater treatment system is provided, which comprises a first flash evaporation unit, a second flash evaporation unit, a third flash evaporation unit and a treatment unit;
the first flash unit, the second flash unit and the third flash unit are sequentially communicated;
the first flash unit, the second flash unit and the third flash unit are provided with steam outlets and discharge ports;
a steam outlet of the third flash evaporation unit is communicated with the condenser;
the treatment unit is communicated with a discharge hole of the third flash evaporation unit;
the treatment unit comprises a clarification tank, a fluoroplastic heat exchanger and a plate-and-frame filter press;
the fluoroplastic heat exchanger is arranged inside the clarification tank, the discharge port of the third flash evaporation unit is communicated with the clarification tank, and the sludge discharge port of the clarification tank is communicated with the plate-and-frame filter press;
the input end of the condenser is communicated with the steam outlet of the third flash evaporation unit; the output end of the condenser is communicated with a cooling liquid inlet of the fluoroplastic heat exchanger, and a cooling liquid outlet of the fluoroplastic heat exchanger is communicated with the desulfurization process water tank.
In a possible implementation manner, the first flash unit, the second flash unit and the third flash unit are provided with condensed water outlets;
the first flash evaporation unit comprises a primary effect heater and a primary effect separator, a condensed water outlet of the primary effect flash evaporation unit is arranged at the bottom of the primary effect separator and is communicated with the primary effect heater through a primary effect circulating pump, and flash evaporation gas liquefied in the primary effect separator is sent into the primary effect heater to be heated and then is circulated into the primary effect separator;
the second flash evaporation unit comprises a secondary-effect heater and a secondary-effect separator, a condensed water outlet of the secondary-effect flash evaporation unit is arranged at the bottom of the secondary-effect separator and is communicated with the secondary-effect heater through a secondary-effect circulating pump, the flash evaporation gas liquefied in the secondary-effect separator is sent into the secondary-effect heater to be heated and then is circulated into the secondary-effect separator, and the secondary-effect heater is communicated with the primary-effect separator to receive the flash evaporation gas output by the primary-effect separator;
the third flash evaporation unit comprises a triple-effect heater and a triple-effect separator, a condensed water outlet of the triple-effect flash evaporation unit is arranged at the bottom of the triple-effect separator and is communicated with the triple-effect heater through a triple-effect circulating pump, the liquefied flash evaporation gas in the triple-effect separator is sent into the triple-effect heater to be heated and then is circulated into the triple-effect separator, and the triple-effect heater is communicated with the double-effect separator to receive the flash evaporation gas output by the double-effect separator.
In a possible implementation manner, the steam outlet of the first flash unit is arranged at the top of the first-effect separator, the steam outlet of the second flash unit is arranged at the top of the second-effect separator, and the steam outlet of the third flash unit is arranged at the top of the third-effect separator.
In one possible implementation, the first flash unit, the second flash unit and the third flash unit are provided with steam inlets;
the steam inlet of the first flash unit is arranged on the primary effect heater and is suitable for being communicated with a flash steam generating device;
the steam inlet of the second flash unit is arranged on the double-effect heater and communicated with the steam outlet of the first flash unit;
and a steam inlet of the third flash evaporation unit is arranged on the three-effect heater and communicated with a steam outlet of the second flash evaporation unit.
In a possible implementation manner, the first flash unit, the second flash unit and the third flash unit are provided with feed inlets;
the feed inlet of the first flash unit is arranged on the first-effect separator and is suitable for being communicated with a waste liquid generating device;
the feed inlet of the second flash unit is arranged in the two-effect separator and communicated with the discharge outlet of the first flash unit;
and the feed inlet of the third flash evaporation unit is arranged in the three-effect separator and communicated with the discharge outlet of the second flash evaporation unit.
In one possible implementation manner, the number of the fluoroplastic heat exchangers is two.
In one possible implementation manner, the number of the fluoroplastic heat exchangers is more than two; more than two fluoroplastic heat exchangers are arranged in parallel or in a matrix.
In one possible implementation mode, the fluoroplastic heat exchanger is arranged at the middle upper part of the clarification tank, and the upper end of the fluoroplastic heat exchanger does not exceed the upper end of the clarification tank.
In one possible implementation, the fluoroplastic heat exchanger includes:
the device comprises a box body, a positioning plate and a fluoroplastic pipe;
the box body is of a square structure, an installation cavity is arranged in the box body, the cooling liquid inlet and the cooling liquid outlet are arranged at the top of the box body, and the side surfaces of the box body except the top and the bottom are provided with a plurality of through holes;
the number of the fluoroplastic pipes is multiple, the fluoroplastic pipes are arranged in an array form to form a pipe bundle, a preset distance is reserved between any two adjacent fluoroplastic pipes, the pipe bundle is in a U-shaped structure, one end of the pipe bundle is communicated with the cooling liquid inlet, and the other end of the pipe bundle is communicated with the cooling liquid outlet;
the number of the positioning plates is multiple, each positioning plate is provided with a plurality of positioning holes for the fluoroplastic pipes to pass through, the number of the positioning holes is the same as that of the fluoroplastic pipes, and the arrangement mode of the positioning holes on the positioning plates is the same as that of the fluoroplastic pipes;
the fluoroplastic pipes and the positioning plates are arranged in the installation cavity of the box body.
In one possible implementation manner, the fluoroplastic heat exchanger comprises a fluoroplastic pipe, a mounting rack and a fixing rack;
the pipe bundle comprises a plurality of fluoroplastic pipes, wherein the fluoroplastic pipes are arranged in parallel to form a pipe bundle, a preset distance is reserved between any two adjacent fluoroplastic pipes, the main body of the pipe bundle is circular, and the axes of the fluoroplastic pipes on the main body part of the pipe bundle are on the same plane;
the mounting frame is arranged above the clarification tank and is fixedly connected with the edge of the upper end of the clarification tank, one ends of the fluoroplastic pipes are arranged at one ends of the mounting frame and are used as the cooling liquid inlets, and the other ends of the fluoroplastic pipes are arranged at the other ends of the mounting frame and are used as the cooling liquid outlets;
the fixing frame is provided with a plurality of fixing frames, each fixing frame is provided with a plurality of positioning holes for the fluoroplastic pipes to pass through, the number of the positioning holes is the same as that of the fluoroplastic pipes, and the arrangement mode of the positioning holes on the fixing frame is the same as that of the fluoroplastic pipes.
The triple-effect flash evaporation desulfurization wastewater treatment system comprises a first flash evaporation unit, a second flash evaporation unit, a third flash evaporation unit and a treatment unit. The first flash evaporation unit, the second flash evaporation unit and the third flash evaporation unit operate in a series connection mode, wastewater is heated by flash steam in the first-effect separator, the wastewater subjected to evaporation concentration enters the second-effect separator to be heated and concentrated by the flash steam again, the wastewater subjected to secondary concentration enters the third-effect separator to be heated and concentrated by the flash steam again, then the wastewater enters the clarification tank to be precipitated for solid-liquid separation, the fluoroplastic heat exchanger arranged in the clarification tank is used for cooling the wastewater to reduce the temperature of the saturated wastewater to separate out crystal salt, and the crystal salt cannot be continuously separated out after the wastewater enters the plate-and-frame filter press, so that filter cloth of the plate-and-frame filter press, a filtrate water system, pipelines and instrument measuring points of the plate-and frame filter press are blocked. The cooling liquid of the fluoroplastic heat exchanger is condensed water from the condenser, and a cooling liquid supply system does not need to be arranged independently.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.
FIG. 1 shows a flow diagram of a three-way flash desulfurization wastewater treatment system according to an embodiment of the present application;
fig. 2 shows a block diagram of a fluoroplastic heat exchanger according to one embodiment of the present application;
fig. 3 shows a block diagram of a fluoroplastic heat exchanger according to another embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention or for simplicity in description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
FIG. 1 shows a flow diagram of a three-way flash desulfurization wastewater treatment system according to an embodiment of the present application. Fig. 2 shows a block diagram of a fluoroplastic heat exchanger according to an embodiment of the present application. Fig. 3 shows a block diagram of another fluoroplastic heat exchanger according to an embodiment of the present application. As shown in fig. 1, the triple-effect flash desulfurization wastewater treatment system comprises a first flash unit 100, a second flash unit 200, a third flash unit 300 and a treatment unit 500; the first flash unit 100, the second flash unit 200 and the third flash unit 300 are sequentially communicated; the first flash unit 100, the second flash unit 200 and the third flash unit 300 are all provided with steam outlets and discharge ports; the steam outlet of the third flash unit 300 is communicated with the condenser 400; the processing unit 500 is communicated with the discharge hole of the third flash evaporation unit 300; the treatment unit 500 comprises a clarification tank 510, a fluoroplastic heat exchanger 520 and a plate-and-frame filter press 530; the fluoroplastic heat exchanger 520 is arranged inside the clarification tank 510, the discharge port of the third flash unit 300 is communicated with the clarification tank 510, and the discharge port of the clarification tank 510 is communicated with the plate-and-frame filter press 530; the input end of the condenser 400 is communicated with the steam outlet of the third flash unit 300; the output end of the condenser 400 is communicated with the coolant inlet of the fluoroplastic heat exchanger 520, and the coolant outlet of the fluoroplastic heat exchanger 520 is communicated with the desulfurization process water tank 600.
The triple-effect flash evaporation desulfurization wastewater treatment system with fluoroplastic heat exchanger 520 of the embodiment of the application is used for crystallization treatment of desulfurization wastewater, and comprises a first flash evaporation unit 100, a second flash evaporation unit 200, a third flash evaporation unit 300 and a treatment unit 500. The first flash unit 100, the second flash unit 200 and the third flash unit 300 operate in a series connection mode, wastewater is heated by flash steam in the first-effect separator 120, the wastewater after evaporation concentration enters the second-effect separator 220 to be heated and concentrated by the flash steam again, the wastewater after re-concentration enters the third-effect separator 320 to be heated and concentrated by the flash steam again, then the wastewater enters the clarification tank 510 to be precipitated for solid-liquid separation, the fluoroplastic heat exchanger 520 arranged in the clarification tank 510 cools the waste liquid to cool the saturated wastewater to separate out crystal salt, the crystal salt cannot continuously separate out after the wastewater enters the plate-and-frame filter press 530, and the plate-and-frame filter press 530 is blocked. The cooling liquid of the fluoroplastic heat exchanger 520 comes from the condensed water of the condenser 400, and a cooling liquid supply system does not need to be arranged separately.
Here, it should be noted that the coolant of the fluoroplastic heat exchanger 520 may also be water source generated by a plant unit such as main unit closed water, air cooler water, process water or industrial water, and the water source is reasonably utilized.
In one possible implementation, the first flash unit 100, the second flash unit 200 and the third flash unit 300 are each provided with a condensed water outlet. The first flash unit 100 comprises a first-effect heater 110 and a first-effect separator 120, wherein a condensed water outlet of the first-effect flash unit is arranged at the bottom of the first-effect separator 120 and is communicated with the first-effect heater 110 through a first-effect circulating pump 130, and liquefied flash evaporation gas in the first-effect separator 120 is sent into the first-effect heater 110 to be heated and then is recycled into the first-effect separator 120. The second flash evaporation unit 200 comprises a secondary-effect heater 210 and a secondary-effect separator 220, a condensed water outlet of the secondary-effect flash evaporation unit is arranged at the bottom of the secondary-effect separator 220 and is communicated with the secondary-effect heater 210 through a secondary-effect circulating pump 230, the liquefied flash evaporation gas in the secondary-effect separator 220 is sent into the secondary-effect heater 210 to be heated and then is circulated into the secondary-effect separator 220, and the secondary-effect heater 210 is communicated with the primary-effect separator 120 to receive the flash evaporation gas output by the primary-effect separator 120. The third flash evaporation unit 300 comprises a triple-effect heater 310 and a triple-effect separator 320, a condensed water outlet of the triple-effect flash evaporation unit is arranged at the bottom of the triple-effect separator 320 and is communicated with the triple-effect heater 310 through a triple-effect circulating pump 330, the liquefied flash evaporation gas in the triple-effect separator 320 is sent into the triple-effect heater 310 to be heated and then is circulated into the triple-effect separator 320, and the triple-effect heater 310 is communicated with the double-effect separator 220 to receive the flash evaporation gas output by the double-effect separator 220. The flash steam which is not liquefied in the separator enters a heater of the next flash unit, the flash steam which is liquefied into condensed water enters the heater of the flash unit through a circulating pump to be heated into flash steam, and the flash steam which is not liquefied in the last flash unit enter the separator of the flash unit again. The consumption of flash steam is reduced, and the utilization rate of the flash steam and water resources is improved.
In one possible implementation, the vapor outlet of the first flash unit 100 is disposed at the top of the first-effect separator 120, the vapor outlet of the second flash unit 200 is disposed at the top of the second-effect separator 220, and the vapor outlet of the third flash unit 300 is disposed at the top of the third-effect separator 320. The first flash unit 100, the second flash unit 200 and the third flash unit 300 are all provided with steam inlets. The steam inlet of the first flash unit 100 is arranged in the first-effect heater 110 and is suitable for being communicated with a flash steam generating device, flash steam enters the first-effect heater 110, is heated and then enters the first-effect separator 120 through the steam outlet of the first-effect heater 110, and the flash steam heats wastewater in the first-effect separator 120 to evaporate and concentrate the wastewater. The steam inlet of the second flash evaporation unit 200 is arranged in the double-effect heater 210 and is communicated with the steam outlet of the first flash evaporation unit 100, flash steam which is not liquefied in the first-effect separator 120 enters the double-effect heater 210, the flash steam enters the double-effect heater 210 and then enters the double-effect separator 220 through the steam outlet of the double-effect heater 210 after being heated, the steam outlet of the double-effect heater 210 is communicated with the middle part of the double-effect separator 220, and the flash steam heats the wastewater in the double-effect separator 220 to evaporate and concentrate the wastewater again. The steam inlet of the third flash evaporation unit 300 is arranged on the triple-effect heater 310 and is communicated with the steam outlet of the second flash evaporation unit 200, flash steam which is not liquefied in the double-effect separator 220 enters the triple-effect heater 310, the flash steam enters the triple-effect heater 310, is heated and then enters the triple-effect separator 320 through the steam outlet of the triple-effect heater 310, the steam outlet of the triple-effect heater 310 is communicated with the middle part of the triple-effect separator 320, and the flash steam heats the wastewater in the triple-effect separator 320, so that the wastewater is evaporated and concentrated again. The flash steam flows through the three flash units in sequence, and the consumption of the flash steam is low. The wastewater is sequentially concentrated from the first effect to the last effect, and the final effect is supersaturated and crystallized and separated out, so that the solid-liquid separation of salt and the wastewater is realized.
In one possible implementation, the first flash unit 100, the second flash unit 200, and the third flash unit 300 are provided with feed inlets. The inlet of the first flash unit 100 is disposed in the first effect separator 120 and is adapted to communicate with a waste liquid generating device. The inlet of the second flash unit 200 is disposed in the second-effect separator 220 and is communicated with the outlet of the first flash unit 100. The feed inlet of the third flash unit 300 is arranged in the three-effect separator 320 and is communicated with the discharge outlet of the second flash unit 200. Under the negative pressure is used, high salt waste water or material flow in proper order to two effects, triple effect by one effect, and waste water is constantly evaporated, and the concentration of salt in the waste water is higher and higher, and when the salt surpasses the supersaturated state in the waste water material, salt will be constantly appeared in the aquatic, and whole process is whole and is accomplished in cycles, realizes the salt water separation. The discharge port of the third flash evaporation unit 300 is communicated with the clarification tank 510 through a discharge pump, and the high-concentration wastewater and the precipitated salt are subjected to centralized treatment in the clarification tank 510.
In one possible implementation, there are two or more fluoroplastic heat exchangers 520. More than two fluoroplastic heat exchangers 520 are arranged in parallel or in a matrix, so that the heat exchange efficiency is improved, and the crystallization salt is more fully precipitated.
In one possible implementation, the fluoroplastic heat exchanger 520 is disposed at the middle upper portion of the clarifier 510, and the upper end of the fluoroplastic heat exchanger 520 does not exceed the upper end of the clarifier 510. The fluoroplastic heat exchanger 520 is immersed in the wastewater in the clarification tank 510 as much as possible, and the fluoroplastic heat exchanger 520 can be located at the upper position in the wastewater, so that the heat exchange efficiency is improved, and the crystallization salt is more sufficiently separated out.
In one possible implementation, as shown in fig. 2, the fluoroplastic heat exchanger 520 includes: a box 521, a positioning plate 523 and a fluoroplastic pipe 522. The box 521 is a square structure, and an installation cavity is arranged inside the box 521 and used for arranging the fluoroplastic pipe 522 and the positioning plate 523. The top of the tank 521 is provided with a coolant inlet 524 and a coolant outlet 525. The side all around of box 521 except top and bottom all is equipped with a plurality of through-holes, and the waste water in the clarifier 510 carries out the heat transfer through a plurality of through-holes submergence fluoroplastics pipe 522. Fluoroplastics pipe 522 is a plurality of, and a plurality of fluoroplastics pipe 522 are the array and arrange and form the tube bank, are equipped with between two arbitrary adjacent fluoroplastics pipe 522 and predetermine the distance, and the tube bank is the U-shaped structure, and the increase contact area of fluoroplastics pipe 522 and waste water improves heat exchange efficiency. One end of the tube bundle is communicated with the cooling liquid inlet 524, and the other end of the tube bundle is communicated with the cooling liquid outlet 525, so that the cooling liquid flows in from the cooling liquid inlet 524, and flows out from the cooling liquid outlet 525 after heat exchange is completed. The fluoroplastic has the characteristics of extremely stable chemical property and good corrosion resistance, so that the fluoroplastic heat exchanger 520 can realize heat exchange on corrosive wastewater. And the fluoroplastic pipe 522 has smooth wall surface and moderate flexibility, and can be set according to the shape of the pipe bundle. The positioning plates 523 are plural and are used for maintaining the relative position relationship between the fluoroplastic pipes 522 and ensuring that the contact area between the fluoroplastic pipes 522 is not reduced due to contact. The plurality of positioning plates 523 are provided, each positioning plate 523 is provided with a plurality of positioning holes for the plurality of fluoroplastic tubes 522 to pass through, the number of the positioning holes is the same as that of the fluoroplastic tubes 522, and the arrangement mode of the plurality of positioning holes on the positioning plate 523 is the same as that of the plurality of fluoroplastic tubes 522. A plurality of fluoroplastic pipes 522 and a plurality of positioning plates 523 are arranged in the installation cavity of the box 521.
Here, the cooling liquid inlet 524 is communicated with the condenser 400, the flash steam enters the condenser 400 to be condensed into liquid after heating the waste liquid in the three-way separator 320, and the liquid formed after condensation is used as the cooling liquid of the fluoroplastic heat exchanger 520, so that water resources are fully utilized. After the heat exchange is completed, the condensed water flows out of the cooling liquid outlet 525, the cooling liquid outlet 525 is communicated with the desulfurization process water tank 600, the condensed water is collected, and waste is avoided. The cooling liquid outlet 525 can also be communicated with a return water system of a power plant to reasonably utilize the condensed water.
In another possible implementation, as shown in fig. 3, the fluoroplastic heat exchanger 520 includes fluoroplastic pipes 522, a mounting block 526, and a fixing block 527. The plurality of fluoroplastic tubes 522 are arranged in parallel to form a tube bundle, a preset distance is arranged between any two adjacent fluoroplastic tubes 522, the tube bundle main body is circular, and the axes of the plurality of fluoroplastic tubes 522 of the main body part of the tube bundle are on the same plane. Mounting bracket 526 sets up in the top of depositing reservoir, with the upper end edge fixed connection of depositing reservoir, and the one end setting of a plurality of fluoroplastics pipes 522 is in the one end of mounting bracket 526, and is imported 524 as the coolant liquid, and the other end setting of a plurality of fluoroplastics pipes 522 is at the other end of mounting bracket 526, exports 525 as the coolant liquid. The fixing frames 527 are multiple, and are used for maintaining the relative position relationship among the fluoroplastic tubes 522 and ensuring that the contact area between the fluoroplastic tubes 522 is not reduced due to contact, each fixing frame 527 is provided with multiple positioning holes for the multiple fluoroplastic tubes 522 to pass through, the number of the positioning holes is the same as that of the fluoroplastic tubes 522, and the arrangement mode of the multiple positioning holes on the fixing frame 527 is the same as that of the multiple fluoroplastic tubes 522.
In one possible implementation, the upper portion of the clarifier 510 is provided with an overflow port, and the sludge discharge port is provided at the lower portion of the clarifier 510. The overflow port is suitable for being communicated with a clear water tank, and the sludge discharge port is communicated with the plate-and-frame filter press through a sludge discharge pump. And the waste water after being cooled and separated out of the crystal salt is discharged into a clear water tank through an overflow port. The precipitated crystal salt and other impurities are precipitated at the bottom of the clarification tank 510, a sludge discharge port is communicated with the plate-and-frame filter press 530 through a sludge discharge pump, and the crystal salt and other impurities at the bottom are pumped into the plate-and-frame filter press 530 through the sludge discharge pump to realize solid-liquid separation. And the waste water is cooled to be more sufficient to precipitate the crystallized salt, so that the crystallized salt can not be continuously precipitated before and after entering the plate-and-frame filter press, and the filter cloth of the plate-and-frame filter press, a filtrate water system, a pipeline and instrument measuring points of the pipeline are blocked.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A triple effect flash evaporation desulfurization effluent disposal system which characterized in that includes:
the system comprises a first flash unit, a second flash unit, a third flash unit and a processing unit;
the first flash unit, the second flash unit and the third flash unit are sequentially communicated;
the first flash unit, the second flash unit and the third flash unit are provided with steam outlets and discharge ports;
a steam outlet of the third flash evaporation unit is communicated with the condenser;
the treatment unit is communicated with a discharge hole of the third flash evaporation unit;
the treatment unit comprises a clarification tank, a fluoroplastic heat exchanger and a plate-and-frame filter press;
the fluoroplastic heat exchanger is arranged inside the clarification tank, the discharge port of the third flash evaporation unit is communicated with the clarification tank, and the sludge discharge port of the clarification tank is communicated with the plate-and-frame filter press;
the input end of the condenser is communicated with the steam outlet of the third flash evaporation unit; the output end of the condenser is communicated with a cooling liquid inlet of the fluoroplastic heat exchanger, and a cooling liquid outlet of the fluoroplastic heat exchanger is communicated with the desulfurization process water tank.
2. The system of claim 1, wherein the first flash unit, the second flash unit, and the third flash unit are provided with condensed water outlets;
the first flash evaporation unit comprises a primary effect heater and a primary effect separator, a condensed water outlet of the primary effect flash evaporation unit is arranged at the bottom of the primary effect separator and is communicated with the primary effect heater through a primary effect circulating pump, and flash evaporation gas liquefied in the primary effect separator is sent into the primary effect heater to be heated and then is circulated into the primary effect separator;
the second flash evaporation unit comprises a secondary-effect heater and a secondary-effect separator, a condensed water outlet of the secondary-effect flash evaporation unit is arranged at the bottom of the secondary-effect separator and is communicated with the secondary-effect heater through a secondary-effect circulating pump, the flash evaporation gas liquefied in the secondary-effect separator is sent into the secondary-effect heater to be heated and then is circulated into the secondary-effect separator, and the secondary-effect heater is communicated with the primary-effect separator to receive the flash evaporation gas output by the primary-effect separator;
the third flash evaporation unit comprises a triple-effect heater and a triple-effect separator, a condensed water outlet of the triple-effect flash evaporation unit is arranged at the bottom of the triple-effect separator and is communicated with the triple-effect heater through a triple-effect circulating pump, the liquefied flash evaporation gas in the triple-effect separator is sent into the triple-effect heater to be heated and then is circulated into the triple-effect separator, and the triple-effect heater is communicated with the double-effect separator to receive the flash evaporation gas output by the double-effect separator.
3. The system of claim 2, wherein the steam outlet of the first flash unit is disposed at the top of the first-effect separator, the steam outlet of the second flash unit is disposed at the top of the second-effect separator, and the steam outlet of the third flash unit is disposed at the top of the third-effect separator.
4. The system of claim 2, wherein the first flash unit, the second flash unit and the third flash unit are provided with steam inlets;
the steam inlet of the first flash unit is arranged on the primary effect heater and is suitable for being communicated with a flash steam generating device;
the steam inlet of the second flash unit is arranged on the double-effect heater and communicated with the steam outlet of the first flash unit;
and a steam inlet of the third flash evaporation unit is arranged on the three-effect heater and communicated with a steam outlet of the second flash evaporation unit.
5. The system of claim 2, wherein the first flash unit, the second flash unit and the third flash unit are provided with feed inlets;
the feed inlet of the first flash unit is arranged on the first-effect separator and is suitable for being communicated with a waste liquid generating device;
the feed inlet of the second flash unit is arranged in the two-effect separator and communicated with the discharge outlet of the first flash unit;
and the feed inlet of the third flash evaporation unit is arranged in the three-effect separator and communicated with the discharge outlet of the second flash evaporation unit.
6. The system for treating wastewater by triple-effect flash evaporation and desulfurization according to claim 1, wherein the number of the fluoroplastic heat exchangers is two.
7. The system for treating the desulfurization waste water by triple effect flash evaporation according to claim 1, wherein the number of the fluoroplastic heat exchangers is two or more; more than two fluoroplastic heat exchangers are arranged in parallel or in a matrix.
8. The system for treating desulfurization waste water by triple effect flash evaporation according to any one of claims 1 to 7, wherein said fluoroplastic heat exchanger is disposed at the middle upper part of said clarifier, and the upper end of said fluoroplastic heat exchanger does not exceed the upper end of said clarifier.
9. A three-way flash desulfurization wastewater treatment system according to any one of claims 1 to 7, wherein said fluoroplastic heat exchanger comprises:
the device comprises a box body, a positioning plate and a fluoroplastic pipe;
the box body is of a square structure, an installation cavity is arranged in the box body, the cooling liquid inlet and the cooling liquid outlet are arranged at the top of the box body, and the side surfaces of the box body except the top and the bottom are provided with a plurality of through holes;
the number of the fluoroplastic pipes is multiple, the fluoroplastic pipes are arranged in an array form to form a pipe bundle, a preset distance is reserved between any two adjacent fluoroplastic pipes, the pipe bundle is in a U-shaped structure, one end of the pipe bundle is communicated with the cooling liquid inlet, and the other end of the pipe bundle is communicated with the cooling liquid outlet;
the number of the positioning plates is multiple, each positioning plate is provided with a plurality of positioning holes for the fluoroplastic pipes to pass through, the number of the positioning holes is the same as that of the fluoroplastic pipes, and the arrangement mode of the positioning holes on the positioning plates is the same as that of the fluoroplastic pipes;
the fluoroplastic pipes and the positioning plates are arranged in the installation cavity of the box body.
10. The system for treating the desulfurization waste water by triple effect flash evaporation of any one of claims 1 to 7, wherein the fluoroplastic heat exchanger comprises a fluoroplastic pipe, a mounting rack and a fixing rack;
the pipe bundle comprises a plurality of fluoroplastic pipes, wherein the fluoroplastic pipes are arranged in parallel to form a pipe bundle, a preset distance is reserved between any two adjacent fluoroplastic pipes, the main body of the pipe bundle is circular, and the axes of the fluoroplastic pipes on the main body part of the pipe bundle are on the same plane;
the mounting frame is arranged above the clarification tank and is fixedly connected with the edge of the upper end of the clarification tank, one ends of the fluoroplastic pipes are arranged at one ends of the mounting frame and are used as the cooling liquid inlets, and the other ends of the fluoroplastic pipes are arranged at the other ends of the mounting frame and are used as the cooling liquid outlets;
the fixing frame is provided with a plurality of fixing frames, each fixing frame is provided with a plurality of positioning holes for the fluoroplastic pipes to pass through, the number of the positioning holes is the same as that of the fluoroplastic pipes, and the arrangement mode of the positioning holes on the fixing frame is the same as that of the fluoroplastic pipes.
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