A zero-discharge device for high-salt wastewater from lignite units

Abstract

The invention discloses a zero-discharge device for high-salt wastewater of a lignite unit, and relates to the technical field of wastewater purification. Current treatment equipment fails to effectively promote impurities in waste liquid to remain in a suspended state, which easily leads to precipitation and scaling. The high-salt wastewater treatment technology has the defects of low treatment efficiency, difficult equipment maintenance, secondary pollution risk and high operation complexity. The invention effectively enhances the tumbling effect of high-salt wastewater during the heating and boiling process through arc plates and circulation positioning sheets, promotes the uniform distribution and circulation of impurities, significantly improves the treatment efficiency and avoids the formation of precipitation. In addition, combined with the design of the condensation component, effective condensation and collection of waste steam is achieved, the recycling rate of water resources is improved, the efficiency and quality of high-salt wastewater treatment are improved, and the treated water quality is ensured to be closer to the standard of pure water. The energy consumption and environmental impact of the treatment process are greatly reduced through efficient heat and water resource management.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater purification, in particular to a zero-discharge device for high-salt wastewater from a lignite unit. Background Art

[0002] The zero-discharge device for high-salt wastewater of lignite units is a device used to treat the salt-containing wastewater generated during the combustion of lignite to achieve wastewater reuse and reduce pollution to the environment.

[0003] In this regard, the patent document with publication number CN212954702U discloses a zero-discharge device for high-salt wastewater in power plants, which includes: a high-density pool, a V-type filter, a clear water pool, an ultrafiltration device, a nanofiltration device, a reverse osmosis membrane concentration device, a flue gas waste heat evaporation crystallization device, and a desulfurization tower. It reduces the use of zero-discharge agents for high-salt wastewater in power plants and the amount of solid wastewater generated by zero-discharge, has a short process flow, low maintenance cost, and realizes the resource utilization of soluble salts in wastewater. At the same time, it uses flue gas waste heat to evaporate and crystallize high-salt water, which greatly reduces the operating cost of zero-discharge of high-salt wastewater in power plants.

[0004] In this regard, the patent document with publication number CN107585936B discloses a zero-discharge treatment process for high-salt wastewater, including: first adjusting the pH of the high-salt wastewater, then performing forward osmosis concentration treatment on the high-salt wastewater to obtain concentrated brine, and then further evaporating, concentrating and crystallizing the concentrated brine to achieve salt separation. The present invention also provides a device for a zero-discharge treatment process for high-salt wastewater. A method combining forward osmosis concentration with low-temperature evaporation and crystallization is adopted. The forward osmosis concentration not only reduces the pretreatment unit and saves costs, but also improves the recovery rate and recovery concentration of the concentrated brine. At the same time, a concentrated draw liquid recovery system is adopted to achieve the recycling of concentrated draw liquid and water. In addition, low-temperature evaporation and crystallization are combined to achieve salt separation, saving energy consumption.

[0005] Today's treatment equipment fails to effectively keep impurities in the waste liquid in a suspended state, which easily leads to precipitation and scaling. The high-salt wastewater treatment technology has the defects of low treatment efficiency, difficult equipment maintenance, secondary pollution risk and high operational complexity.

[0006] In view of the above problems, a zero-discharge device for high-salt wastewater of lignite units is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a zero-discharge device for high-salt wastewater from a lignite unit, which solves the problems in the background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a zero-discharge device for high-salt wastewater of a lignite unit, comprising a purification chamber, the top of the purification chamber is connected to an upper cover, a heat dissipation fin is embedded in the interior of the upper cover, a heat dissipation fan is arranged at the bottom of the heat dissipation fin, the heat dissipation fin and the heat dissipation fan are combined to dissipate heat inside the purification chamber, and conveying pipes are arranged on both sides of the purification chamber, and the conveying pipes are connected to the interior of the purification chamber;

[0009] The purification chamber is divided into two parts, the upper part of the purification chamber is provided with a condensation component, and the lower part of the purification chamber is provided with a circulation component;

[0010] The circulation assembly includes a circulation positioning piece, and the circulation positioning piece is provided with two groups, and the two groups of circulation positioning pieces are symmetrically arranged inside the purification chamber, and the circulation positioning piece is fixedly connected to the bottom end of the inner wall of the purification chamber, and a low-position arc plate and a high-position arc plate are arranged on the circulation positioning piece, and the circulation positioning piece, the low-position arc plate and the high-position arc plate are an integrated structure, and the circulation positioning piece, the low-position arc plate and the high-position arc plate are all arranged in an arc shape;

[0011] A heating plate is installed at the bottom end of the purification chamber, and the heating plate is used to heat the liquid. The heating plate is embedded between two groups of circulation positioning plates. A liquid inlet pipe is also embedded inside the purification chamber, and the liquid inlet pipe is arranged in a Y shape. A rotating paddle is also installed inside the purification chamber, and the rotating paddle is used to stir the liquid.

[0012] The rotating paddle, the heating plate and the liquid inlet pipe are all arranged between two groups of circulation positioning plates, and the surface of the circulation positioning plate is provided with filter holes.

[0013] Preferably, the condensation component includes a conveying roller, the outer surface of which is wrapped with a condensation belt, a condensation sheet is connected to the condensation belt, a conducting groove is opened on the conveying roller, an isolation cover is embedded in the interior of the condensation belt, a partition plate is arranged at the bottom end of the condensation belt, and the upper surface of the partition plate is arranged as an inclined surface.

[0014] Preferably, the liquid outlet of the liquid inlet pipe is opened on the side, and the liquid is discharged from the inside of the liquid inlet pipe and hits the rotating paddle, thereby driving the rotating paddle to perform circular motion.

[0015] Preferably, the bending directions of the circulation positioning piece, the low-position arc plate and the high-position arc plate are kept consistent, and the length of the low-position arc plate is smaller than that of the high-position arc plate.

[0016] Preferably, the bottom end of the partition plate is connected to the circulation positioning sheet, and a group of notches for gas circulation is provided between the partition plates, and the spacing between the notches is the same as the spacing between the two groups of circulation positioning sheets.

[0017] Preferably, the conducting grooves are arranged on the condensing belt to separate the condensing plates, and a group of conducting grooves is arranged between every two groups of condensing plates, and the conducting grooves are used to dissipate the heat of redundant hot air inside the condensing belt.

[0018] Preferably, the condensing sheet is connected to the outer surface of the condensing belt through a fixing member, and the condensing sheet is a sheet structure made of copper.

[0019] Preferably, the isolation cover is arranged to be high in the middle and low at both ends, the interior of the isolation cover is arranged to be hollow, and the interior of the isolation cover is filled with a coolant for cooling.

[0020] Preferably, both ends of the isolation cover extend to just above the partition plate, and the water vapor generated by the heating plate condenses when it contacts the bottom surface of the isolation cover, and the condensed liquid flows into the interior of the partition plate.

[0021] Preferably, the filter holes are arranged at the junction of the circulation positioning piece and the low-position arc plate or the circulation positioning piece and the high-position arc plate, and the filter holes are used to filter impurities in the wastewater.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a zero-discharge device for high-salt wastewater from a lignite unit, which effectively enhances the tumbling effect of high-salt wastewater during the heating and boiling process through arc plates and circulation positioning plates, promotes the uniform distribution and circulation of impurities, significantly improves the treatment efficiency and avoids the formation of precipitation. In addition, combined with the design of the condensation component, through the interaction between the condensation belt and the condensation plate, the effective condensation and collection of waste steam is achieved, further improving the recycling rate of water resources. On the whole, the device effectively overcomes the low treatment efficiency existing in traditional high-salt wastewater treatment technology. The present application improves the efficiency and quality of high-salt wastewater treatment, ensures that the treated water quality is closer to the standard of pure water, and also greatly reduces the energy consumption and environmental impact of the treatment process through efficient heat and water resource management. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the purification chamber of the present invention.

[0026] Figure 3 It is a schematic diagram of the structure of the conveying roller and the condensing belt of the present invention.

[0027] Figure 4 It is a schematic diagram of the structure of the partition plate and the conveying pipe of the present invention.

[0028] Figure 5It is a schematic structural diagram of the heat dissipation fins and the heat dissipation fan of the present invention.

[0029] Figure 6 It is a schematic structural diagram of the partition plate of the present invention.

[0030] Figure 7 It is a schematic structural diagram of the conducting groove of the present invention.

[0031] Figure 8 It is a schematic diagram of the structure of the circulation positioning sheet and the filter hole of the present invention.

[0032] Fig. 9 It is a schematic diagram of the front cross-sectional structure of the present invention.

[0033] Fig.10 It is a front view structural schematic diagram of the rotating paddle and the heating plate of the present invention.

[0034] In the figure: 11, purification chamber; 12, upper cover; 13, heat dissipation fins; 14, conveying pipe; 15, cooling fan; 2, condensation assembly; 21, conveying roller; 22, condensation belt; 23, condensation plate; 24, isolation cover; 25, partition plate; 26, conduction groove; 3, circulation assembly; 31, circulation positioning plate; 32, filter hole; 33, rotating paddle; 34, heating plate; 35, liquid inlet pipe; 36, low-position arc plate; 37, high-position arc plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0037] Combination Figure 1-Figure 10 A zero-discharge device for high-salt wastewater of a lignite unit of the present invention comprises a purification chamber 11, an upper cover 12 is connected to the top of the purification chamber 11, a heat dissipation fin 13 is embedded in the upper cover 12, a heat dissipation fan 15 is arranged at the bottom of the heat dissipation fin 13, the heat dissipation fin 13 and the heat dissipation fan 15 are combined to dissipate heat inside the purification chamber 11, and a delivery pipe 14 is arranged on both sides of the purification chamber 11, and the delivery pipe 14 is connected to the inside of the purification chamber 11;

[0038] During the purification of high-salt wastewater, the waste liquid enters the interior of the purification chamber 11, and the top of the purification chamber 11 is sealed by the upper cover 12 to prevent foreign matter from falling into it. In addition, a relatively good purification environment can be provided. By purifying the waste liquid, zero discharge of wastewater is achieved.

[0039] In the waste liquid treatment stage, it is completed through the condensation component 2 and the circulation component 3. The specific operations are as follows:

[0040] The purification chamber 11 is divided into two parts, the upper part of the purification chamber 11 is provided with a condensation component 2, and the lower part of the purification chamber 11 is provided with a circulation component 3;

[0041] The circulation assembly 3 includes a circulation positioning piece 31, and the circulation positioning piece 31 is provided with two groups. The two groups of circulation positioning pieces 31 are symmetrically arranged inside the purification bin 11. The circulation positioning piece 31 is fixedly connected to the bottom end of the inner wall of the purification bin 11. A low arc plate 36 and a high arc plate 37 are arranged on the circulation positioning piece 31. The circulation positioning piece 31, the low arc plate 36 and the high arc plate 37 are an integrated structure. The circulation positioning piece 31, the low arc plate 36 and the high arc plate 37 are all arranged in an arc shape;

[0042] A heating plate 34 is installed at the bottom end of the purification chamber 11. The heating plate 34 is used to heat the liquid. The heating plate 34 is embedded between the two groups of circulation positioning plates 31. A liquid inlet pipe 35 is also embedded in the purification chamber 11. The liquid inlet pipe 35 is set in a Y shape. A rotating paddle 33 is also installed in the purification chamber 11. The rotating paddle 33 is used to stir the liquid. The liquid outlet of the liquid inlet pipe 35 is opened on the side. The liquid is discharged from the inside of the liquid inlet pipe 35 and hits the rotating paddle 33, thereby driving the rotating paddle 33 to perform a circular motion.

[0043] The rotating paddle 33, the heating plate 34 and the liquid inlet pipe 35 are all arranged between the two groups of circulation positioning plates 31. The surface of the circulation positioning plate 31 is provided with a filter hole 32. The bending directions of the circulation positioning plate 31, the low-position arc plate 36 and the high-position arc plate 37 are consistent. The length of the low-position arc plate 36 is less than the length of the high-position arc plate 37. The filter hole 32 is arranged at the intersection of the circulation positioning plate 31 and the low-position arc plate 36 or the circulation positioning plate 31 and the high-position arc plate 37. The filter hole 32 is used to filter impurities in the wastewater.

[0044] First, the waste liquid is transported to the interior of the purification bin 11 through the liquid inlet pipe 35. When the waste liquid is transported to the interior of the purification bin 11 and is located between the two groups of circulation positioning plates 31, the impact force generated by the flow of the waste liquid hits the rotating paddle 33, which drives the rotating paddle 33 to rotate. After the waste liquid enters between the two groups of circulation positioning plates 31, in order to further improve the efficiency and quality of purification, the waste liquid is heated by the heating plate 34. After heating, as the temperature of the waste liquid continues to rise, the liquid will boil. When the liquid boils, a phenomenon of cold and hot interaction will occur inside the liquid, and then the waste liquid will roll. The rolling of the waste liquid will drive the rotating paddle 33 to rotate, and the rotating paddle 33 will stir the waste liquid.

[0045] When the high-salinity wastewater is heated, the water in the wastewater begins to evaporate and reaches a boiling state. During the boiling process, a large number of bubbles are generated inside the liquid, which carry dissolved solid particles and impurities. As the bubbles rise and the liquid tumbles, these impurities circulate in the wastewater. This circulation process helps prevent impurities from settling and gathering at the bottom, thereby avoiding the formation of precipitation;

[0046] In addition, through the filter holes 32 provided on the circulation positioning sheet 31, when circulating, the purified liquid passes through the outside of the circulation positioning sheet 31, and the impurities cannot pass through the filter holes 32 and are stored on the inside of the circulation positioning sheet 31, so that the suspended matter and other insoluble impurities in the waste liquid can be further removed, ensuring that the quality of the treated wastewater is higher;

[0047] During purification, as the water evaporates, the salt concentration in the wastewater will increase, improving the efficiency of subsequent treatment. At the same time, high temperature can accelerate the decomposition of organic matter, thereby reducing organic pollutants in the wastewater;

[0048] In order to further improve the efficiency of the internal circulation of the waste liquid after heating, a low-position arc plate 36 and a high-position arc plate 37 are set. When the waste liquid is heated and boiled, the low-position arc plate 36 and the high-position arc plate 37 serve as guide structures to guide the boiling water flow to a specific direction, thereby increasing the speed and range of the liquid flow. Secondly, the boiling water flow can form a continuous tumbling line, which helps to enhance the tumbling effect inside the waste liquid, making the impurities more evenly distributed and circulated, reducing the dead corners that may exist inside the container, and ensuring that each part can be effectively treated.

[0049] The low-position arc plate 36 and the high-position arc plate 37 arranged on the upper end of the circulation positioning plate 31 can enhance the tumbling effect of the liquid, speed up the circulation speed of impurities, and thus improve the efficiency of the entire processing process. Through uniform tumbling and circulation, the deposition of impurities at the bottom of the container can be reduced, reducing the difficulty of subsequent cleaning. Secondly, when the liquid is tumbling, the impurities will be stored in the gap between the low-position arc plate 36 and the circulation positioning plate 31 or the joint between the circulation positioning plate 31 and the high-position arc plate 37, which is convenient for the collection and processing of impurities.

[0050] After filtering the waste liquid, in order to further process it, the circulation component 3 and the condensation component 2 are coordinated with each other, and the specific operation is as follows:

[0051] The condensation assembly 2 includes a conveying roller 21, the outer surface of the conveying roller 21 is wrapped with a condensation belt 22, and a condensation sheet 23 is connected to the condensation belt 22. The condensation sheet 23 is connected to the outer surface of the condensation belt 22 through a fixing member. The condensation sheet 23 is a sheet structure made of copper. A conduction groove 26 is provided on the conveying roller 21. An isolation cover 24 is embedded in the interior of the condensation belt 22. The isolation cover 24 is set to be high in the middle and low at both ends. The interior of the isolation cover 24 is set to be hollow. The interior of the isolation cover 24 is filled with a coolant for cooling. The two ends of the isolation cover 24 extend to just above the partition plate 25. The water vapor generated by heating by the heating plate 34 condenses when it contacts the bottom surface of the isolation cover 24, and the condensed liquid flows into the interior of the partition plate 25. The bottom end of the condensation belt 22 is provided with a partition plate 25, and the upper surface of the partition plate 25 is set to be an inclined surface. The bottom end of the partition plate 25 is connected to the circulation positioning sheet 31. A group of notches for gas circulation is provided between the partition plates 25, and the spacing of the notches is the same as the spacing between the two groups of circulation positioning sheets 31.

[0052] The conducting grooves 26 are arranged on the condensing belt 22 to separate the condensing sheets 23 . A group of conducting grooves 26 is arranged between every two groups of condensing sheets 23 . The conducting grooves 26 are used to dissipate the redundant hot air inside the condensing belt 22 .

[0053] When the high-salt waste liquid is heated to boiling, it is heated by the heating plate 34. After heating, the water vapor generated by the boiling of the waste liquid will gradually rise. When the water vapor rises and contacts the condensing plate 23 on the condensing belt 22, condensation will occur and the water vapor will condense into liquid. At this time, as the conveying roller 21 drives the condensing belt 22 to rotate, the condensing plate 23 with a lower temperature is continuously transferred to the place where it contacts the water vapor the most. When the condensing belt 22 rotates, the condensed water attached to the condensing plate 23 will be scraped off by the partition plate 25 when the condensing plate 23 contacts the partition plate 25. Clean liquid is collected by heating and evaporation.

[0054] In order to improve the condensation effect of water vapor, the condensation belt 22 and the condensation sheet 23 are cooled by the cooling fan 15 and the cooling fins 13. After cooling, the condensation of water vapor is facilitated, and then the condensed water is collected by the partition plate 25. With continuous heating, impurities in the wastewater are more easily precipitated, thereby achieving zero discharge of wastewater.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zero-discharge device for high-salt wastewater from a lignite unit, comprising a purification chamber (11), characterized in that: The top of the purification chamber (11) is connected to an upper cover (12), a heat dissipation fin (13) is embedded in the interior of the upper cover (12), a heat dissipation fan (15) is arranged at the bottom of the heat dissipation fin (13), the heat dissipation fin (13) and the heat dissipation fan (15) are combined to dissipate heat from the interior of the purification chamber (11), and delivery pipes (14) are arranged on both sides of the purification chamber (11), and the delivery pipes (14) are connected to the interior of the purification chamber (11); The purification chamber (11) is divided into two parts, an upper part and an lower part, wherein a condensation component (2) is arranged inside the upper part of the purification chamber (11), and a circulation component (3) is arranged inside the lower part of the purification chamber (11); The circulation assembly (3) comprises a circulation positioning piece (31), wherein two groups of the circulation positioning pieces (31) are provided, and the two groups of circulation positioning pieces (31) are symmetrically arranged inside the purification chamber (11), the circulation positioning pieces (31) are fixedly connected to the bottom end of the inner wall of the purification chamber (11), and a low-position arc plate (36) and a high-position arc plate (37) are provided on the circulation positioning piece (31), the circulation positioning piece (31), the low-position arc plate (36) and the high-position arc plate (37) are an integrated structure, and the circulation positioning piece (31), the low-position arc plate (36) and the high-position arc plate (37) are all arranged in an arc shape; The condensation assembly (2) comprises a conveying roller (21), the outer surface of the conveying roller (21) is wrapped with a condensation belt (22), the condensation belt (22) is connected to a condensation sheet (23), a conduction groove (26) is provided on the conveying roller (21), an isolation cover (24) is embedded in the interior of the condensation belt (22), a partition plate (25) is provided at the bottom end of the condensation belt (22), and the upper surface of the partition plate (25) is provided as an inclined surface; The bottom end of the partition plate (25) is connected to the circulation positioning plate (31), and a group of slots for gas circulation are provided between the partition plates (25), and the spacing between the slots is the same as the spacing between the two groups of circulation positioning plates (31); A heating plate (34) is installed at the bottom end of the purification chamber (11). The heating plate (34) is used to heat the liquid. The heating plate (34) is embedded between the two groups of circulation positioning plates (31). A liquid inlet pipe (35) is also embedded in the purification chamber (11). The liquid inlet pipe (35) is arranged in a Y shape. A rotating paddle (33) is also installed in the purification chamber (11). The rotating paddle (33) is used to stir the liquid. The rotating paddle (33), the heating plate (34) and the liquid inlet pipe (35) are all arranged between the two groups of circulation positioning plates (31), and the surface of the circulation positioning plates (31) is provided with filter holes (32); The liquid outlet of the liquid inlet pipe (35) is opened on the side, and the liquid is discharged from the inside of the liquid inlet pipe (35) and hits the rotating paddle (33), thereby driving the rotating paddle (33) to perform circular motion; The bending directions of the circular positioning piece (31), the low-position arc plate (36) and the high-position arc plate (37) are consistent, and the length of the low-position arc plate (36) is shorter than the length of the high-position arc plate (37).

2. A zero-discharge device for high-salt wastewater from a lignite unit according to claim 1, characterized in that: The conducting grooves (26) are arranged on the condensing belt (22) to separate the condensing sheets (23). A group of conducting grooves (26) is arranged between every two groups of condensing sheets (23). The conducting grooves (26) are used to dissipate the heat of redundant hot air inside the condensing belt (22).

3. A zero-discharge device for high-salt wastewater from a lignite unit according to claim 2, characterized in that: The condensing sheet (23) is connected to the outer surface of the condensing belt (22) via a fixing piece, and the condensing sheet (23) is a sheet structure made of copper.

4. A zero-discharge device for high-salt wastewater from a lignite unit according to claim 3, characterized in that: The isolation cover (24) is arranged to be high in the middle and low at both ends, the interior of the isolation cover (24) is arranged to be hollow, and the interior of the isolation cover (24) is filled with a cooling liquid for cooling.

5. The zero-discharge device for high-salt wastewater from a lignite unit according to claim 1 is characterized by: Both ends of the isolation cover (24) extend to just above the partition plate (25), and water vapor generated by heating of the heating plate (34) condenses when it contacts the bottom surface of the isolation cover (24), and the condensed liquid flows into the interior of the partition plate (25).

6. A zero-discharge device for high-salt wastewater from a lignite unit according to claim 1, characterized in that: The filter hole (32) is arranged at the junction of the circulation positioning piece (31) and the low-position arc plate (36) or the circulation positioning piece (31) and the high-position arc plate (37), and the filter hole (32) is used to filter impurities in the wastewater.

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