Concentration method and system for salt-containing solution

Abstract

The invention discloses a concentration method and system for a salt-containing solution, and belongs to the field of salt-containing solution treatment.The concentration method for the salt-containing solution comprises the following steps that S1, biomass and / or organic matter sludge are / is added into a gasification furnace from the upper portion of the gasification furnace, a gasification agent is introduced from the lower portion of the gasification furnace, and the biomass and / or the organic matter sludge are / is subjected to gasification treatment; s2, taking one part of the high-temperature synthesis gas generated in the step S1 as a heat source of an evaporator, and feeding a salt-containing solution into the evaporator for evaporation and concentration treatment to obtain a concentrated solution, and S3, feeding the high-temperature synthesis gas subjected to heat exchange in the step S2 and the other part of the high-temperature synthesis gas generated in the step S1 into a purifier for purification, the obtained purified gas is used as fuel gas. According to the invention, resource utilization of biomass and organic matter sludge is realized, high-temperature synthesis gas is used as a heat source of the evaporator for evaporation and concentration of a salt-containing solution, energy consumption is reduced, evaporation and concentration efficiency is improved, and the high-temperature synthesis gas after heat exchange is purified into fuel gas.

Description

Technical Field

[0001] The present invention belongs to the field of treatment of saline solutions, and particularly relates to a method and system for concentrating saline solutions. Background Art

[0002] In the fields of environmental protection and resource recovery, treating saline solutions generated from industrial wastewater, waste residues and other waste materials, such as landfill leachate, leaching solutions of tungsten and molybdenum, has always been a technical challenge. Most traditional treatment methods for these saline solutions adopt evaporation concentration processes, where water is evaporated by heating to separate and recover the salts therein. However, this process requires a large amount of steam energy, which not only increases the treatment cost but also imposes an additional burden on the environment.

[0003] Meanwhile, biomass resources such as palm shells and leaves, as well as organic sludge, have rich calorific values. Specifically, the calorific values of biomass such as palm shells are usually between 3900 and 4800 kcal / kg, while the calorific values of organic sludge are in the range of 2200 to 3000 kcal / kg. These waste materials are usually regarded as treatment problems, but actually contain considerable thermal energy resources. If this part of the calorific value can be effectively utilized, not only can the treatment problem of waste materials be solved, but also it can be used as a sustainable energy source.

[0004] For an evaporator, salts, impurities, etc. in the saline solution are likely to form scale on the heat transfer surface of the evaporator and the inner surface of the pipeline, resulting in a decrease in heat transfer efficiency, an increase in fluid resistance, and even blockage of the pipeline, affecting the normal operation of the evaporator. Although a variety of anti-scaling and descaling technologies have been proposed and applied, each method has its limitations. Especially when dealing with complex and variable saline solutions, a single technology often fails to achieve an ideal anti-scaling effect. Summary of the Invention

[0005] The purpose of the present invention is to propose a method and system for concentrating saline solutions to overcome at least one of the above defects in the prior art.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A method for concentrating a saline solution provided by the present invention includes the following steps: S1: adding biomass and / or organic sludge into the gasifier from the upper part of the gasifier, introducing a gasifying agent from the lower part of the gasifier, and performing gasification treatment on the biomass and / or organic sludge to generate biochar and high-temperature synthesis gas; S2: using a part of the high-temperature synthesis gas generated in step S1 as the heat source of the evaporator, sending the saline solution into the evaporator for evaporation concentration treatment to obtain a concentrated solution; S3: purifying the high-temperature synthesis gas after heat exchange in step S2 and another part of the high-temperature synthesis gas generated in step S1 in a purifier to obtain purified gas for use as fuel gas.

[0008] Preferably, the biomass is palm shell biomass and pine branch biomass with a moisture content < 30%, a length of 40 - 80 mm, the gasifying agent is air and / or steam, and the high-temperature syngas includes methane, hydrogen, carbon monoxide, carbon dioxide, and hydrogen sulfide.

[0009] Preferably, the pressure of the gasifier is 0.1 - 1 MPa, and the gasification temperature is 700 - 1000 °C.

[0010] Preferably, step S1 further includes adding calcium oxide into the gasifier.

[0011] The present invention also provides a concentration system for a salt-containing solution, which is used to implement the above-mentioned concentration method for a salt-containing solution, and includes: a gasifier, an evaporator, and a purifier. The high-temperature syngas outlet of the gasifier is communicated with the heat source inlet of the evaporator, and the heat source outlet of the evaporator is communicated with the inlet of the purifier.

[0012] Preferably, the evaporator further includes a box body, a first valve, a second valve, a heat exchange tube assembly, a stirring assembly, a descaling scraper, a gas-liquid separator, a concentrated liquid outlet, an exhaust port, a third valve, and a fourth valve. The upper part of the left side wall of the box body is fixedly communicated with a heat source inlet, and a first valve is arranged at the heat source inlet. The upper part of the right side wall of the box body is fixedly communicated with a heat source outlet, and a second valve is arranged at the heat source outlet. The heat exchange tube assembly is arranged inside the box body, and the left end is communicated with the heat source inlet, and the right end is communicated with the heat source outlet. The stirring assembly is fixed to the box body and extends into the box body to be fixedly provided with a descaling scraper. A gas-liquid separator is arranged above the inside of the box body, the exhaust end of the gas-liquid separator is fixedly communicated with an exhaust port, and a third valve is arranged at the exhaust port. The bottom of the box body is fixedly communicated with a concentrated liquid outlet, and a fourth valve is arranged at the concentrated liquid outlet.

[0013] Preferably, the stirring assembly includes a motor, a first gear, a second gear, a first bearing seat, a first rotating shaft, and a first stirring blade. The motor and the first bearing seat are fixed on the top of the box body. The first gear is fixed on the top of the motor. The second gear is fixed on the upper part of the first rotating shaft. The second gear meshes with the first gear. The first rotating shaft passes through the first bearing seat and the top wall of the box body and extends into the box body to be fixedly provided with a plurality of first stirring blades.

[0014] Preferably, the heat exchange tube assembly includes a first spiral tube, a first connecting tube, a second spiral tube, a third spiral tube, and a second connecting tube. The first spiral tube is vertically arranged on the left side inside the box body. The air inlet end of the first spiral tube is fixedly communicated with the heat source air inlet. The air outlet end of the first spiral tube is fixedly communicated with a first connecting tube. The air outlet end of the first connecting tube is fixedly communicated with a second spiral tube. The air outlet end of the second spiral tube is fixedly communicated with a third spiral tube. The third spiral tube is vertically arranged on the right side inside the box body. The second spiral tube is located between the first spiral tube and the third spiral tube. The air outlet end of the third spiral tube is fixedly communicated with a second connecting tube. The air outlet end of the second connecting tube is fixedly communicated with the heat source air outlet. The second spiral tube surrounds the first stirring blade.

[0015] Preferably, the stirring assembly further includes a sealed box, a second bearing seat, a third bearing seat, a first bevel gear, a second bevel gear, a second rotating shaft, and a second stirring blade. The sealed box is fixed to the lower part inside the box body. Second bearing seats are fixed to the upper and lower side walls inside the sealed box. The bottom end of the first rotating shaft passes through the sealed box and the second bearing seat and extends below the sealed box to be fixed with a descaling scraper. The first bevel gear is located inside the sealed box and fixed to the first rotating shaft. Third bearing seats are fixed to the left and right side walls inside the sealed box. The inner end of the second rotating shaft is fixed with a second bevel gear. The second bevel gear meshes with the first bevel gear. The outer end of the second rotating shaft passes through the side wall of the sealed box and the third bearing seat and extends outside the sealed box to be fixed with a second stirring blade. The second stirring blade is arranged perpendicular to the first stirring blade. The second stirring blade is located below the first stirring blade. The second spiral tube surrounds the second stirring blade. Sealing is provided between the first rotating shaft and the sealed box, and between the second rotating shaft and the sealed box.

[0016] Preferably, the descaling scraper includes a horizontal plate and a vertical plate. The bottom end of the first rotating shaft is fixed with a horizontal plate, and vertical plates are fixed to the left and right ends of the horizontal plate.

[0017] Preferably, it further includes a compressor, an air pipe, a sealing ring, a fourth bearing, a piston, a push rod, a first push seat, a first guide rod, a first spring, a first brush, a second push seat, a second guide rod, a second spring, and a second brush. The interior of the first rotating shaft has a first cavity, the interior of the horizontal plate has a second cavity, the second cavity communicates with the first cavity, the interior of the vertical plate has a third cavity, the third cavity communicates with the second cavity, a fourth bearing is fixed to the upper part inside the first cavity, the compressor is fixed to the top of the box body, the exhaust end of the compressor is fixedly communicated with an air pipe, the air pipe passes through the top of the first rotating shaft and passes through the fourth bearing and extends into the first cavity. A sealing ring is arranged between the first rotating shaft and the first cavity, and the sealing ring is located below the fourth bearing. The piston is slidably connected to the first cavity, the bottom end of the piston is fixed with a push rod, the bottom end of the push rod extends into the second cavity and is fixed with a first push seat, and a plurality of first brushes are fixed to the bottom end of the first push seat. The first brushes can pass through the bottom wall of the horizontal plate. A plurality of first guide rods are fixed to the top wall inside the second cavity, the first guide rods are inserted into the first push seat, and a first spring is wound around each first guide rod. The top end of the first spring is fixed to the top wall inside the first cavity, and the bottom end of the first spring is fixed to the top wall of the first push seat. The left and right side walls of the first push seat each have a first inclined surface. A plurality of second guide rods are fixed to the inner side wall of the third cavity, the second guide rods are inserted into the second push seat, and a second spring is wound around each second guide rod. The inner end of the second spring is fixed to the inner side wall of the third cavity, and the outer end of the second spring is fixed to the inner side wall of the second push seat. A plurality of second brushes are fixed to the outer side wall of the second push seat. The second brushes can pass through the outer side wall of the vertical plate. The bottom of the second push seat has a second inclined surface that cooperates with the first inclined surface so that when the first push seat moves downward, it pushes the second push seat to move outward.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. Realize the resource utilization of biomass and organic sludge. Use high-temperature synthesis gas as the heat source of the evaporator for evaporating and concentrating the saline solution, reduce energy consumption, improve the evaporation and concentration efficiency, ensure the quality and output of the concentrated solution, and the high-temperature synthesis gas after heat exchange is purified into fuel gas by the purifier, realizing the recycling of energy and improving the energy utilization efficiency of the system.

[0020] 2. Add calcium oxide to the gasifier to react with a small amount of hydrogen sulfide to generate harmless calcium sulfide, remove hydrogen sulfide from the high-temperature synthesis gas, improve the quality of the synthesis gas, and avoid subsequent environmental pollution.

[0021] 3. The stirring component in the evaporator stirs to make the saline solution evenly heated, reduce dead zones and low-flow regions, and scour the scale layer; the scale removal scraper scrapes the dirt on the inner wall of the box body to avoid scaling.

[0022] 4. In the stirring assembly, the motor drives the first gear and the second gear to rotate the first rotating shaft, and the first stirring blade rotates to stir the solution, improving the uniformity of heat reception; the heat exchange tube assembly transfers heat in multiple layers and in multiple directions. The second spiral tube surrounds the first stirring blade, improving the evaporation and concentration efficiency, reducing problems such as scaling caused by local overheating, and extending the service life of the equipment.

[0023] 5. The additional second stirring blade in the stirring assembly is perpendicular to the first stirring blade and is linked through the first bevel gear and the second bevel gear to stir the solution in three-dimensional space, enhancing the convection intensity, improving the heat transfer efficiency and the uniformity of heat reception, reducing bottom deposition and scaling, and improving the operation efficiency and stability of the equipment.

[0024] 6. The design of the horizontal plate and the vertical plate of the descaling scraper can comprehensively clean the inner wall of the box body, reduce the cleaning time, improve the work efficiency, and can achieve online descaling during stirring.

[0025] 7. Compressed air is input through the compressor to control the extension and retraction of the first brush and the second brush, realizing all-round online brush descaling and cleaning. The operation is simple, and it can quickly reset after the cleaning task is completed. Moreover, the first guide rod and the second guide rod ensure the stable and reliable telescopic movement of the first brush and the second brush.

[0026] 8. The first brush and the second brush extend and retract as needed, avoiding unnecessary wear and interference on the inner wall of the box body, making the structure compact, realizing the complementary advantages of the descaling scraper and the brush, and improving the descaling effect and efficiency.

[0027] 9. Users can quickly switch the brush state to adapt to different cleaning requirements, reducing the waste of cleaning time; integrating the first brush, the second brush and the descaling scraper reduces the number and types of cleaning tools, and can synchronously realize the synchronous telescopic movement of the bottom and side brushes, simplifying the operation process and improving the overall efficiency of the cleaning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the system block diagram of the present invention.

[0029] Figure 2 is the structural schematic diagram of the evaporator of the present invention.

[0030] Figure 3 is the structural schematic diagram of the heat exchange tube assembly of the present invention.

[0031] Figure 4 is the right view structural schematic diagram of the first spiral tube of the present invention.

[0032] Figure 5 is the combined structural schematic diagram of the sealed box and its upper structure of the present invention.

[0033] Figure 6 is the combined structural schematic diagram of the descaling scraper and its upper structure of the present invention.

[0034] Figure 7 is Figure 6 The enlarged structural schematic diagram of A in

[0035] Figure 8 is the structural schematic diagram of the cooperation of the first rotating shaft, the air pipe, the sealing ring and the fourth bearing of the present invention.

[0036] The reference signs in the drawings are: 100 - gasifier, 200 - evaporator, 300 - purifier, 1 - heat source inlet, 2 - heat source outlet, 3 - box body, 4 - first valve, 5 - second valve, 6 - heat exchange tube assembly, 7 - stirring assembly, 8 - descaling scraper, 9 - gas-liquid separator, 10 - concentrated liquid outlet, 11 - exhaust port, 12 - third valve, 13 - fourth valve, 71 - motor, 72 - first gear, 73 - second gear, 74 - first bearing seat, 75 - first rotating shaft, 76 - first stirring blade, 61 - first spiral tube, 62 - first connecting pipe, 63 - second spiral tube, 64 - third spiral tube, 65 - second connecting pipe, 77 - sealing box, 78 - second bearing seat, 79 - third bearing seat, 710 - first bevel gear, 711 - second bevel gear, 712 - second rotating shaft, 713 - second stirring blade, 81 - cross plate, 82 - vertical plate, 14 - compressor, 15 - air pipe, 16 - sealing ring, 17 - fourth bearing, 18 - piston, 19 - push rod, 20 - first push seat, 21 - first guide rod, 22 - first spring, 23 - first brush, 24 - second push seat, 25 - second guide rod, 26 - second spring, 27 - second brush, 28 - first cavity, 29 - second cavity, 30 - third cavity, 31 - first inclined surface, 32 - second inclined surface. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with the drawings and specific implementation manners.

[0038] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0039] A method for concentrating a salt-containing solution provided in this embodiment includes the following steps:

[0040] S1: Feed palm shell biomass and pine branch biomass with moisture content < 30% and organic matter sludge with a length of 40 - 80 mm into the gasifier 100 from the upper part of the gasifier 100. Pass air and steam into the gasifier 100 from the lower part to gasify the biomass and organic matter sludge, generating biochar and high-temperature syngas. Among them, the pressure of the gasifier 100 is 0.2 MPa, and the gasification temperature is 850 °C. The high-temperature syngas includes methane, hydrogen, carbon monoxide, carbon dioxide, and hydrogen sulfide. The biochar can be used for soil improvement and can also be used as fuel.

[0041] Add calcium oxide into the gasifier 100. A small amount of hydrogen sulfide in the gasifier 100 reacts with calcium oxide to reduce the hydrogen sulfide content in the high-temperature syngas.

[0042] S2: Use a part of the high-temperature syngas generated in step S1 as the heat source of the evaporator 200, and feed the salt-containing solution into the evaporator 200 for evaporation and concentration treatment to obtain a concentrated solution.

[0043] The high-temperature syngas after heat exchange in step S2 and another part of the high-temperature syngas generated in step S1 enter the purifier 300 for purification to remove gases such as hydrogen sulfide, and the purified gas is used as fuel gas.

[0044] Using palm shell biomass, pine branch biomass, and organic matter sludge with a moisture content below 30% as the raw materials of the gasifier 100, through gasification treatment, not only high-temperature syngas is generated, but also biochar is produced. The biochar has the dual value of soil improvement and as fuel, realizing the resource utilization of waste and reducing environmental pollution. In the gasifier 100, by controlling the pressure at 0.2 MPa and the gasification temperature at 850 °C, the effective gasification of biomass and sludge is ensured, and high-temperature syngas rich in methane, hydrogen, and carbon monoxide is generated. These gases have a high energy density and provide a stable heat source for subsequent evaporation and concentration. Add calcium oxide into the gasifier 100, and use it to react with a small amount of hydrogen sulfide generated during gasification to form harmless calcium sulfide, thereby effectively removing hydrogen sulfide in the high-temperature syngas. This step not only improves the quality of the syngas but also avoids potential environmental pollution in subsequent treatment. Using the high-temperature syngas generated in step S1 as the heat source of the evaporator 200 to perform evaporation and concentration treatment on the salt-containing solution. This process not only reduces energy consumption but also improves the efficiency of evaporation and concentration, ensuring the quality and output of the concentrated solution. The high-temperature syngas after evaporation and concentration heat exchange enters the purifier 300 for purification treatment to remove impurities and pollutants therein, obtaining pure syngas. This syngas can be used as fuel gas, further realizing the recycling of energy and improving the energy utilization efficiency of the entire system.

[0045] In summary, the method for concentrating the saline solution of the present application not only realizes the resource utilization of biomass and sludge, but also improves the energy utilization efficiency and reduces environmental pollution through steps such as high-efficiency gasification, hydrogen sulfide removal, evaporation concentration, and purification and reuse of syngas, with significant economic and environmental benefits.

[0046] As Figures 1 to 8 shown, the present embodiment further provides a concentrating system for the saline solution, which is used to implement the method for concentrating the saline solution described above, and includes: a gasifier 100, an evaporator 200, and a purifier 300. The high-temperature syngas outlet of the gasifier 100 is connected to the heat source inlet 1 of the evaporator 200, and the heat source outlet 2 of the evaporator 200 is connected to the inlet of the purifier 300.

[0047] Among them, the evaporator 200 further includes a box body 3, a first valve 4, a second valve 5, a heat exchange tube assembly 6, a stirring assembly 7, a descaling scraper 8, a gas-liquid separator 9, a concentrated liquid outlet 10, an exhaust port 11, a third valve 12, and a fourth valve 13. The upper part of the left side wall of the box body 3 is fixedly connected to the heat source inlet 1, and the heat source inlet 1 is provided with the first valve 4. The upper part of the right side wall of the box body 3 is fixedly connected to the heat source outlet 2, and the heat source outlet 2 is provided with the second valve 5. The heat exchange tube assembly 6 is arranged inside the box body 3, and the left end is connected to the heat source inlet 1, and the right end is connected to the heat source outlet 2. The stirring assembly 7 is fixed to the box body 3 and extends into the box body 3 to be fixedly provided with the descaling scraper 8. The gas-liquid separator 9 is arranged above the inside of the box body 3, and the exhaust end of the gas-liquid separator 9 is fixedly connected to the exhaust port 11, and the exhaust port 11 is provided with the third valve 12. The bottom of the box body 3 is fixedly connected to the concentrated liquid outlet 10, and the concentrated liquid outlet 10 is provided with the fourth valve 13.

[0048] When performing the evaporation concentration treatment of the saline solution, the saline solution is fed into the box body 3. The first valve 4 is opened, and the high-temperature syngas generated by the gasifier 100 enters the heat exchange tube assembly 6 as a heat source through the heat source inlet 1 to heat the saline solution. The saline solution is heated and evaporated and vaporized, enters the gas-liquid separator 9 for gas-liquid separation, and the separated steam is discharged through the exhaust port 11 to realize the concentration treatment of the saline solution. During the evaporation concentration treatment process, the saline solution is stirred by the stirring assembly 7 to make it evenly heated, reduce the dead zone and low-flow rate areas, increase the material flow rate, make the scale layer not easy to form, and have a scouring effect on the formed scale layer. And while the stirring assembly 7 is performing the stirring operation, the dirt attached to the inner wall of the box body 3 is scraped off by the descaling scraper 8 to further avoid scaling. The second valve 5 is opened, and the high-temperature syngas after heat exchange through the heat exchange tube assembly 6 is discharged to the purifier 300 through the heat source outlet 2 for purification treatment. When it is necessary to take out the concentrated liquid, the fourth valve 13 is opened, and the concentrated liquid is discharged through the concentrated liquid outlet 10.

[0049] Among them, the stirring assembly 7 includes a motor 71, a first gear 72, a second gear 73, a first bearing seat 74, a first rotating shaft 75, and a first stirring blade 76. The motor 71 and the first bearing seat 74 are fixed to the top of the box body 3. The first gear 72 is fixed to the top of the motor 71. The second gear 73 is fixed to the upper part of the first rotating shaft 75. The second gear 73 meshes with the first gear 72. The first rotating shaft 75 passes through the first bearing seat 74 and the top wall of the box body 3 and extends into the interior of the box body 3 where a plurality of first stirring blades 76 are fixed. During the stirring operation, the motor 71 rotates, driving the first gear 72 to rotate, causing the second gear 73 to rotate, driving the first rotating shaft 75 to rotate, and further driving the first stirring blades 76 to rotate to stir the saline solution and improve its uniform heat reception.

[0050] Among them, the heat exchange tube assembly 6 includes a first spiral tube 61, a first connecting tube 62, a second spiral tube 63, a third spiral tube 64, and a second connecting tube 65. The first spiral tube 61 is vertically arranged on the left side inside the box body 3. The air inlet end of the first spiral tube 61 is fixedly communicated with the heat source air inlet 1. The air outlet end of the first spiral tube 61 is fixedly communicated with the first connecting tube 62. The air outlet end of the first connecting tube 62 is fixedly communicated with the second spiral tube 63. The air outlet end of the second spiral tube 63 is fixedly communicated with the third spiral tube 64. The third spiral tube 64 is vertically arranged on the right side inside the box body 3. The second spiral tube 63 is located between the first spiral tube 61 and the third spiral tube 64. The air outlet end of the third spiral tube 64 is fixedly communicated with the second connecting tube 65. The air outlet end of the second connecting tube 65 is fixedly communicated with the heat source air outlet 2. The second spiral tube 63 surrounds the first stirring blades 76.

[0051] The arrangement of the first spiral tube 61, the second spiral tube 63, and the third spiral tube 64 forms a multi-level and multi-directional heat transfer path. After the high-temperature synthesis gas enters the first spiral tube 61 from the heat source inlet 1, it enters the second spiral tube 63 through the first connecting tube 62, then passes through the third spiral tube 64, and finally is discharged from the heat source outlet 2 through the second connecting tube 65. This multi-level and multi-directional flow pattern enables heat to be more evenly distributed throughout the entire box body 3, avoiding local overheating or overcooling. Moreover, the second spiral tube 63 is arranged to surround the first stirring blade 76. This design allows heat to be transferred more directly to the saline solution near the first stirring blade 76, and through the rotation of the stirring blade, the heat is more evenly dispersed throughout the saline solution. The rotation of the first stirring blade 76 not only promotes the flow of the saline solution but also enhances the convective and conductive effects of heat, thereby improving the uniformity of heating. Due to the cooperative action of the heat exchange tube assembly 6 and the stirring blade, the saline solution is heated more evenly, and the evaporation rate is thus increased. The uniformly heated solution enables the water in the solution to evaporate more quickly, thereby improving the efficiency of evaporation and concentration. Under the stirring action of the first stirring blade 76, the heat in the solution can be more evenly dispersed, avoiding problems such as solution scaling and blockage caused by local overheating. This not only improves the operating stability of the equipment but also extends the service life of the equipment.

[0052] Among them, the stirring assembly 7 further includes a sealing box 77, a second bearing seat 78, a third bearing seat 79, a first bevel gear 710, a second bevel gear 711, a second rotating shaft 712, and a second stirring blade 713. The sealing box 77 is fixed to the lower part inside the box body 3. Both the upper and lower side walls inside the sealing box 77 are fixed with second bearing seats 78. The bottom end of the first rotating shaft 75 passes through the sealing box 77 and the second bearing seat 78 and extends below the sealing box 77 to be fixed with a descaling scraper 8. The first bevel gear 710 is located inside the sealing box 77 and is fixed to the first rotating shaft 75. Third bearing seats 79 are fixed to both the left and right side walls inside the sealing box 77. The inner end of the second rotating shaft 712 is fixed with a second bevel gear 711. The second bevel gear 711 meshes with the first bevel gear 710. The outer end of the second rotating shaft 712 passes through the side wall of the sealing box 77 and the third bearing seat 79 and extends outside the sealing box 77 to be fixed with a second stirring blade 713. The second stirring blade 713 is arranged perpendicular to the first stirring blade 76. The second stirring blade 713 is located below the first stirring blade 76. The second spiral tube 63 surrounds the second stirring blade 713. A sealing arrangement is provided between the first rotating shaft 75 and the sealing box 77, and between the second rotating shaft 712 and the sealing box 77.

[0053] The first rotating shaft 75 rotates, driving the first bevel gear 710 to rotate, causing the second bevel gear 711 to rotate, driving the second rotating shaft 712 to rotate, and further driving the second stirring blade 713 to rotate. The settings of the first stirring blade 76 and the second stirring blade 713 enable the stirring assembly 7 to stir the saline solution in multiple directions. This multi-dimensional stirring method enables the saline solution to be fully stirred in three-dimensional space, enhancing the convection intensity of the saline solution, thereby improving the heat transfer efficiency and the uniformity of heat reception, and further reducing the occurrence of scaling. The vertical setting and rotation of the second stirring blade 713 also enable the particles and salts at the bottom of the solution to be effectively stirred up, reducing the possibility of bottom sedimentation. When the particles and salts in the saline solution are stirred up, they will rub against the inner walls of the stirring assembly 7 and the box body 3, thereby helping to remove the dirt and scale adhering to them. In summary, the special settings of the first stirring blade 76 and the second stirring blade 713, and the way they achieve linkage stirring through the cooperation of the first bevel gear 710 and the second bevel gear 711, bring significant benefits to the uniformity of heat reception and anti-scaling of the saline solution. This design not only improves the heat transfer efficiency and the uniformity of heat reception, but also helps to reduce the sedimentation and scaling of the solution, thereby improving the operating efficiency and stability of the equipment.

[0054] Among them, the descaling scraper 8 includes a horizontal plate 81 and a vertical plate 82. The bottom end of the first rotating shaft 75 is fixed with a horizontal plate 81, and vertical plates 82 are fixed to both the left and right ends of the horizontal plate 81. The design of the horizontal plate 81 enables the descaling scraper 8 to comprehensively scrape the bottom wall of the container in the horizontal direction to remove the attached dirt and sediment. The vertical plate 82 further enhances the cleaning ability in the vertical direction to ensure that the inner side wall of the box body 3 can be effectively cleaned. Since the descaling scraper 8 can comprehensively and effectively clean the inner wall of the box body 3, the cleaning time required can be significantly reduced, improving the work efficiency. The descaling scraper 8 rotates with the first rotating shaft 75 to achieve on-line descaling while stirring.

[0055] Among them, it further includes a compressor 14, an air pipe 15, a sealing ring 16, a fourth bearing 17, a piston 18, a push rod 19, a first push seat 20, a first guide rod 21, a first spring 22, a first brush 23, a second push seat 24, a second guide rod 25, a second spring 26, and a second brush 27. The interior of the first rotating shaft 75 has a first cavity 28, the interior of the horizontal plate 81 has a second cavity 29, the second cavity 29 communicates with the first cavity 28, the interior of the vertical plate 82 has a third cavity 30, the third cavity 30 communicates with the second cavity 29. A fourth bearing 17 is fixed to the upper part inside the first cavity 28, a compressor 14 is fixed to the top of the box body 3, the exhaust end of the compressor 14 is fixedly communicated with an air pipe 15, the air pipe 15 passes through the top of the first rotating shaft 75 and passes through the fourth bearing 17 and extends into the first cavity 28. A sealing ring 16 is arranged between the first rotating shaft 75 and the first cavity 28, and the sealing ring 16 is located below the fourth bearing 17. The piston 18 is slidably connected to the first cavity 28, the bottom end of the piston 18 is fixed with a push rod 19, the bottom end of the push rod 19 extends into the second cavity 29 and is fixed with a first push seat 20, and a number of first brushes are fixed to the bottom end of the first push seat 20, and the first brushes can pass through the bottom wall of the horizontal plate 81. A number of first guide rods 21 are fixed to the top wall inside the second cavity 29, the first guide rods 21 are inserted into the first push seat 20, and a first spring 22 is wound around each first guide rod 21. The top end of the first spring 22 is fixed to the top wall inside the first cavity 28, and the bottom end of the first spring 22 is fixed to the top wall of the first push seat 20. First inclined surfaces 31 are provided on both the left and right side walls of the first push seat 20. A number of second guide rods 25 are fixed to the inner side wall of the third cavity 30, the second guide rods 25 are inserted into the second push seat 24, and a second spring 26 is wound around each second guide rod 25. The inner end of the second spring 26 is fixed to the inner side wall of the third cavity 30, and the outer end of the second spring 26 is fixed to the inner side wall of the second push seat 24. A number of second brushes 27 are fixed to the outer side wall of the second push seat 24, and the second brushes 27 can pass through the outer side wall of the vertical plate 82. The bottom of the second push seat 24 has a second inclined surface 32 that cooperates with the first inclined surface 31, so that when the first push seat 20 moves downward, it pushes the second push seat 24 to move outward. Through the arrangement of the fourth bearing 17, the stable delivery of compressed air and the normal rotation of the first rotating shaft 75 are ensured, and the sealing ring 16 plays a sealing role.

[0056] It has the effects of efficient and convenient online descaling, deep cleaning and non-destructive protection, flexible adaptation and structural optimization, and improved cleaning efficiency and convenience.

[0057] Efficient and convenient online descaling: When descaling is required using the first brush 23 and the second brush 27, the compressor 14 inputs compressed air through the air pipe 15 into the first cavity 28, pushing the piston 18, the push rod 19, and the first push seat 20 to move downward in sequence, causing the first brush 23 to extend out of the cross plate 81. At the same time, the first push seat 20 drives the left and right second push seats 24 to move outward through the inclined plane cooperation, driving the second brush 27 to extend out of the vertical plate 82, achieving full - range online brush descaling and cleaning. Without additional complex operations, the descaling process can be quickly started. After the cleaning task is completed, the first push seat 20 resets upward under the action of the first spring 22, causing the first brush 23 to retract into the cross plate 81; the second push seat 24 resets inward under the action of the second spring 26, and the second brush 27 retracts into the vertical plate 82. In addition, the first guide rod 21 and the second guide rod 25 respectively ensure the smooth movement of the first push seat 20 and the second push seat 24, guaranteeing the stability and reliability of the brush telescoping action.

[0058] Efficient and convenient online descaling: The brush has a soft material and fine bristles, which can penetrate into the tiny gaps and uneven surfaces that are difficult for the descaling scraper 8 to reach, and conduct detailed and comprehensive cleaning on the inner wall of the box body 3, effectively removing stubborn dirt and deposits. Different from hard cleaning tools, the brush will not cause damage to the inner wall of the box body 3 during the cleaning process, while ensuring the cleaning effect, it extends the service life of the box body 3.

[0059] Flexible adaptation and structural optimization: The first brush 23 and the second brush 27 can be telescoped as needed, extending for cleaning when needed and retracting when not needed. This not only avoids unnecessary wear or interference to the inner wall of the box body 3, but also makes the overall structure more compact, facilitating the operation of the equipment under different working conditions. This design also realizes the complementary advantages of the descaling scraper 8 and the brush. First, use the scraper to remove large - area and harder dirt, and then extend the first brush 23 and the second brush 27 to clean the remaining fine dirt, significantly improving the descaling effect and efficiency.

[0060] Improve cleaning efficiency and convenience: Users can quickly switch the extended and retracted states of the brush, quickly adapt to different cleaning needs, and reduce the time waste during the cleaning process. At the same time, integrating the first brush 23, the second brush 27, and the descaling scraper 8 into one reduces the number and types of cleaning tools, making the operation more convenient. In addition, it can synchronously achieve the synchronous telescoping of the first brush 23 at the bottom and the second brushes 27 on the left and right sides, further simplifying the operation process and improving the overall efficiency of the cleaning work.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for concentrating a salt-containing solution, characterized in that, It includes the following steps: S1: Add biomass and / or organic sludge into the gasifier from the upper part of the gasifier, introduce the gasifying agent into the gasifier from the lower part, perform gasification treatment on the biomass and / or organic sludge to produce biochar and high-temperature syngas; S2: Use a part of the high-temperature syngas generated in step S1 as the heat source of the evaporator, send the salt-containing solution into the evaporator for evaporation and concentration treatment to obtain a concentrated solution; S3: The high-temperature syngas after heat exchange in step S2 and another part of the high-temperature syngas generated in step S1 enter the purifier for purification, and the purified gas is used as fuel gas.

2. The method for concentrating a salt-containing solution according to claim 1, wherein In step S1: The biomass is palm shell biomass and pine branch biomass with a moisture content < 30%, and the length is 40 - 80 mm; The gasifying agent is air and / or steam; The high-temperature syngas includes methane, hydrogen, carbon monoxide, carbon dioxide, and hydrogen sulfide; The pressure of the gasifier is 0.1 - 1 MPa, and the gasification temperature is 700 - 1000 °C.

3. The method for concentrating a salt-containing solution according to claim 1, wherein Step S1 further includes: Add calcium oxide into the gasifier.

4. A concentration system for a salt-containing solution, characterized in that, A method for concentrating the salt-containing solution according to any one of claims 1 - 3, including: A gasifier, an evaporator, and a purifier; The high-temperature syngas outlet of the gasifier is communicated with the heat source inlet of the evaporator; The heat source outlet of the evaporator is communicated with the inlet of the purifier.

5. The salt-containing solution concentration system according to claim 4, characterized in that: The evaporator further includes a box body, a first valve, a second valve, a heat exchange tube assembly, a stirring assembly, a descaling scraper, a gas-liquid separator, a concentrated solution outlet, an exhaust port, a third valve, and a fourth valve; The upper part of the left side wall of the box body is fixedly communicated with a heat source inlet, and the heat source inlet is provided with a first valve; The upper part of the right side wall of the box body is fixedly communicated with a heat source outlet, and the heat source outlet is provided with a second valve; The heat exchange tube assembly is arranged inside the box body, and the left end is communicated with the heat source inlet, and the right end is communicated with the heat source outlet; The stirring assembly is fixed to the box body and extends into the box body to be fixed with a descaling scraper; A gas-liquid separator is arranged above the inside of the box body, the exhaust end of the gas-liquid separator is fixedly communicated with an exhaust port, and the exhaust port is provided with a third valve; The bottom of the box body is fixedly communicated with a concentrated solution outlet, and the concentrated solution outlet is provided with a fourth valve.

6. The salt-containing solution concentration system according to claim 5, characterized in that: The stirring assembly includes a motor, a first gear, a second gear, a first bearing seat, a first rotating shaft, and a first stirring blade; The motor and the first bearing seat are fixed to the top of the box body; The first gear is fixed to the top of the motor, the second gear is fixed to the upper part of the first rotating shaft, and the second gear meshes with the first gear; The first rotating shaft passes through the first bearing seat and the top wall of the box body and extends into the box body to be fixed with a plurality of first stirring blades.

7. The salt-containing solution concentration system according to claim 6, characterized in that: The heat exchange tube assembly includes a first spiral tube, a first connecting tube, a second spiral tube, a third spiral tube, and a second connecting tube; The first spiral tube is vertically arranged on the left side inside the box body. The air inlet end of the first spiral tube is fixedly communicated with the heat source air inlet, and the air outlet end of the first spiral tube is fixedly communicated with a first connecting pipe; The air outlet end of the first connecting pipe is fixedly communicated with a second spiral tube; The air outlet end of the second spiral tube is fixedly communicated with a third spiral tube. The third spiral tube is vertically arranged on the right side inside the box body; The second spiral tube is located between the first spiral tube and the third spiral tube; The air outlet end of the third spiral tube is fixedly communicated with a second connecting pipe. The air outlet end of the second connecting pipe is fixedly communicated with the heat source air outlet; The second spiral tube surrounds the first stirring blade; 8. The concentration system for a salt-containing solution according to claim 7, wherein: The stirring assembly further includes a sealing box, a second bearing seat, a third bearing seat, a first bevel gear, a second bevel gear, a second rotating shaft, and a second stirring blade; The sealing box is fixed below the inside of the box body; Second bearing seats are fixed on both the upper and lower side walls inside the sealing box. The bottom end of the first rotating shaft passes through the sealing box and the second bearing seat, and extends below the sealing box to be fixed with the descaling scraper; The first bevel gear is located inside the sealing box and is fixed to the first rotating shaft; Third bearing seats are fixed on both the left and right side walls inside the sealing box. The inner end of the second rotating shaft is fixed with a second bevel gear. The second bevel gear meshes with the first bevel gear. The outer end of the second rotating shaft passes through the side wall of the sealing box and the third bearing seat, and extends outside the sealing box to be fixed with a second stirring blade; The second stirring blade is arranged perpendicular to the first stirring blade. The second stirring blade is located below the first stirring blade. The second spiral tube surrounds the second stirring blade; A sealing is provided between the first rotating shaft and the sealing box, and between the second rotating shaft and the sealing box; 9. The concentration system for a salt-containing solution according to claim 6, wherein: The descaling scraper includes a cross plate and a vertical plate; The bottom end of the first rotating shaft is fixed with a cross plate, and vertical plates are fixed at both the left and right ends of the cross plate; 10. The concentration system for a salt-containing solution according to claim 9, wherein: It further includes a compressor, an air pipe, a sealing ring, a fourth bearing, a piston, a push rod, a first push seat, a first guide rod, a first spring, a first brush, a second push seat, a second guide rod, a second spring, and a second brush; A first cavity is provided inside the first rotating shaft. A second cavity is provided inside the cross plate. The second cavity is communicated with the first cavity. A third cavity is provided inside the vertical plate. The third cavity is communicated with the second cavity; A fourth bearing is fixed at the upper part inside the first cavity; The compressor is fixed on the top of the box body. The exhaust end of the compressor is fixedly communicated with an air pipe. The air pipe passes through the top of the first rotating shaft and passes through the fourth bearing, and extends into the first cavity. A sealing ring is provided between the first rotating shaft and the first cavity. The sealing ring is located below the fourth bearing; The piston is slidably connected to the first cavity. A push rod is fixed to the bottom end of the piston. The bottom end of the push rod extends into the second cavity and is fixed with a first push seat. A plurality of first brushes are fixed to the bottom end of the first push seat, and the first brushes can pass through the bottom wall of the cross plate; A plurality of first guide rods are fixed to the top wall of the second cavity. The first guide rods are inserted into the first push seat. A first spring is wound around each of the first guide rods. The top end of the first spring is fixed to the top wall of the first cavity, and the bottom end of the first spring is fixed to the top wall of the first push seat; Both the left and right side walls of the first push seat have first inclined surfaces; A plurality of second guide rods are fixed to the inner side wall of the third cavity. The second guide rods are inserted into the second push seat. A second spring is wound around each of the second guide rods. The inner end of the second spring is fixed to the inner side wall of the third cavity, and the outer end of the second spring is fixed to the inner side wall of the second push seat. A plurality of second brushes are fixed to the outer side wall of the second push seat, and the second brushes can pass through the outer side wall of the vertical plate; The bottom of the second push seat has a second inclined surface that cooperates with the first inclined surface, so that when the first push seat moves downward, it pushes the second push seat to move outward.

Images