Waste liquid drying and purifying device, evaporative crystallization system and process method

Abstract

The invention relates to the technical field of industrial wastewater treatment, and discloses a waste liquid drying and purifying device, an evaporative crystallization system and a process method. The waste liquid drying and purifying device comprises a drying unit, a gas collecting hood and a gas purifying device. The drying unit includes a housing having an opening. The drying unit is used for drying the waste liquid to obtain a dry material. The gas collecting hood is arranged at the opening of the shell and used for collecting steam generated when the drying unit dries the waste liquid. The gas purification device comprises a gas inlet and a gas outlet. A gas inlet of the gas purification device is communicated with the gas collecting hood, and the gas purification device can purify the steam and exhaust the purified gas from the exhaust port. The waste liquid is treated into the dry material discharged out of a factory in a solid phase state and the harmless gas discharged into the atmosphere in a gas phase state, the wastewater treatment effect is improved, and zero emission of industrial wastewater treatment is effectively achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of industrial wastewater treatment, and specifically relates to a waste liquid drying and purification device, an evaporation crystallization system and a process method. Background Art

[0002] In the magnesium desulfurization process, the desulfurizer absorbs sulfur dioxide and other substances in the flue gas to reduce environmental pollution. As the desulfurizer continues to absorb the flue gas, a large amount of smoke dust, MgSO 4 Insoluble substances such as MgSO4 need to be discharged and replaced continuously or intermittently in the desulfurized liquid. The total dissolved solids content in the desulfurized liquid is high, for example, the mass fraction of the total dissolved solids is 15%. In practical applications, evaporation crystallization technology is used to treat the desulfurized liquid to obtain MgSO4 4 , and recycle resources.

[0003] During the evaporation and crystallization process, due to the presence of Ca in the desulfurized liquid 2+ ions, the solubility of the produced calcium sulfate is extremely low and precipitates, and is enriched downstream, causing the feed liquid to become increasingly thick, which is not conducive to evaporation and crystallization. In addition, the desulfurized liquid may also contain chemical oxygen demand (COD), and evaporation and concentration will increase its concentration, produce foam, and affect the operation of the evaporation and crystallization equipment. At the same time, because the desulfurized liquid contains a large amount of chloride ions, the chloride ions and calcium and magnesium ions form compounds such as calcium chloride and magnesium chloride. These compounds increase the boiling point of the feed liquid, resulting in the evaporation and crystallization process being unable to further reduce the moisture content of the viscous material (i.e., further concentrate it), and thus the centrifuge salt separation operation cannot be performed, making it impossible to continue to treat the viscous material, affecting the wastewater treatment effect, and making it difficult for the evaporation and crystallization process to achieve "zero discharge" in wastewater treatment. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art.

[0005] Therefore, a first aspect of the present application provides a waste liquid drying and purification device.

[0006] A second aspect of the present application provides an evaporative crystallization system.

[0007] The third aspect of the present application provides an evaporation crystallization process method.

[0008] In view of this, according to the first aspect of an embodiment of the present application, a waste liquid drying and purification device is proposed, including: a drying unit, the drying unit including a shell having an opening, the drying unit being used to dry the waste liquid to obtain dry material; an air collecting hood, arranged at the opening, for collecting steam generated by the drying unit when drying the waste liquid; a gas purification device, including an air inlet and an exhaust port, the air inlet being connected to the air collecting hood, the gas purification device being capable of purifying the steam and discharging the purified gas from the exhaust port.

[0009] In some embodiments, the waste liquid drying and purification device also includes: a waste liquid buffer tank, which is connected to the drying unit and is used to provide waste liquid to the drying unit; and a stirring component, which is arranged in the waste liquid buffer tank and is used to stir the waste liquid.

[0010] In some embodiments, the waste liquid drying and purification device also includes: a first pump body, the inlet of the first pump body is connected to the waste liquid buffer tank, and the outlet of the first pump body is connected to the feed port of the drying unit; a first liquid level gauge is arranged in the drying unit, and is used to detect the liquid level of the waste liquid in the drying unit; a controller, the signal input end of the controller is electrically connected to the first liquid level gauge, and the signal output end of the controller is electrically connected to the first pump body, and the controller is used to control the feeding flow rate of the first pump body according to the liquid level detected by the first liquid level gauge.

[0011] In some embodiments, the drying unit also includes a waste reflux port, and the waste liquid drying and purification device also includes: a first pipeline, one end of the first pipeline is connected to the waste reflux port, and the other end of the first pipeline is connected to the waste liquid buffer tank, and the first pipeline is used to allow the waste liquid in the drying unit to flow back into the waste liquid buffer tank.

[0012] In some embodiments, the drying unit further includes: a liquid tank, disposed inside the shell, including the feed port, the liquid tank being used to hold waste liquid; a drum, rotatably disposed in the shell, a portion of the surface of the drum being located in the liquid tank and in contact with the waste liquid, the drum including a heating chamber and a heat source interface connected to the heating chamber; wherein the heat source interface is used to connect to a heat source to heat the drum during the rotation of the drum relative to the shell, dry the waste liquid, and thereby obtain dry material.

[0013] In some embodiments, the gas purification device includes: a spray tower, the spray tower includes a liquid storage area and a nozzle, the nozzle is located above the liquid storage area, the spray tower is provided with the air inlet and the exhaust port, the air inlet is located between the liquid storage area and the nozzle, and the exhaust port is located at the top of the spray tower; an induced draft component, the air inlet of the induced draft component is connected to the air collecting hood, and the air outlet of the induced draft component is connected to the air inlet; a second pump body, the inlet of the second pump body is connected to the liquid storage area, and the outlet of the second pump body is connected to the nozzle to provide spray liquid for the nozzle; wherein the induced draft component is used to deliver steam into the spray tower, and in the process of the steam flowing from the air inlet to the exhaust port, it contacts the spray liquid sprayed from the nozzle to achieve gas purification.

[0014] In some embodiments, the waste liquid drying and purification device also includes: a second pipeline, one end of which is connected to the outlet of the second pump body, and the other end of the second pipeline is connected to the drying unit; a valve component, which is arranged in the second pipeline and electrically connected to the signal output end of the controller; a temperature sensor and / or a second liquid level gauge, which are arranged in the spray tower and electrically connected to the signal input end of the controller, the temperature sensor is used to detect the temperature of the liquid in the liquid storage area, and the second liquid level gauge is used to detect the liquid level of the liquid in the liquid storage area; wherein the controller is used to control the opening and closing of the valve component according to the temperature detected by the temperature sensor and / or the liquid level detected by the second liquid level gauge.

[0015] In some embodiments, the waste liquid drying and purification device also includes: a third pipeline, one end of which is connected to the air outlet of the air induced component, and the other end of the third pipeline passes through the air inlet of the spray tower and extends into the liquid in the liquid storage area.

[0016] According to the second aspect of the embodiment of the present application, an evaporation crystallization system is proposed, including: evaporation crystallization equipment, the evaporation crystallization equipment includes a discharge port for discharging waste liquid; a waste liquid drying and purification device as in any of the previous embodiments, connected to the discharge port of the evaporation crystallization equipment.

[0017] According to the third aspect of the embodiment of the present application, an evaporation crystallization process method is proposed, which uses the evaporation crystallization system as mentioned above to treat the desulfurized liquid, including the following steps: the evaporation crystallization equipment evaporates and crystallizes the desulfurized liquid to generate waste liquid; the waste liquid is sent to the waste liquid drying and purification device for drying and purification, wherein the drying unit dries the waste liquid to obtain dry material, and the gas purification device purifies the steam generated by the drying unit drying the waste liquid, and discharges the purified gas.

[0018] The waste liquid drying and purification device, evaporation crystallization system and process method provided in this application can at least achieve the following technical effects:

[0019] The waste liquid drying and purification device of the present application includes a drying unit, which can dry the waste liquid through the drying unit to reduce the water content of the viscous material (waste liquid) to obtain dry material. The drying unit includes a shell with an opening, and a gas collecting hood is arranged at the opening so that the steam generated by the drying unit drying the waste liquid can flow to the gas collecting hood to collect the steam. The gas purification device includes an air inlet and an exhaust port, and the air inlet is connected to the gas collecting hood so that the steam collected by the gas collecting hood can enter the gas purification device through the air inlet. The gas purification device purifies the steam and discharges the purified gas from the exhaust port to achieve the drying and purification of the waste liquid. In other words, the present application processes the waste liquid into dry materials discharged from the factory in a solid phase and harmless gases discharged into the atmosphere in a gas phase, effectively reducing the waste liquid discharged from the factory in a liquid phase, improving the wastewater treatment effect, and effectively achieving the "zero discharge" of industrial wastewater treatment.

[0020] The evaporation crystallization system provided by the present application includes an evaporation crystallization device and a waste liquid drying and purification device as in any of the previous embodiments, so that the waste liquid discharged from the evaporation crystallization device enters the waste liquid drying and purification device for treatment. Compared with the related art, the evaporation crystallization system of the present application can further reduce the moisture content of the viscous material and achieve "zero discharge" of industrial wastewater treatment.

[0021] The evaporation crystallization process provided in the present application uses an evaporation crystallization device to evaporate and crystallize the desulfurized liquid to achieve resource recycling. The waste liquid generated during the evaporation crystallization process is sent to a waste liquid drying and purification device for drying and purification, achieving "zero discharge" in industrial wastewater treatment.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1 A schematic diagram of the structure of a waste liquid drying and purification device provided in an embodiment of the present disclosure;

[0025] Figure 2 A schematic diagram of the internal structure of a drying unit provided in an embodiment of the present disclosure;

[0026] Figure 3 A schematic diagram of the structure of a waste liquid buffer tank provided in an embodiment of the present disclosure;

[0027] Figure 4A schematic diagram of the structure of a gas purification device provided in an embodiment of the present disclosure;

[0028] Figure 5 A schematic diagram of the structure of an evaporation crystallization system provided in an embodiment of the present disclosure;

[0029] Figure 6 A flow chart of the evaporation crystallization process provided in an embodiment of the present disclosure.

[0030] The reference numerals are:

[0031] 100: waste liquid drying and purification device; 10: drying unit; 11: shell; 111: opening; 12: waste material return port; 13: liquid tank; 14: feed port; 15: drum; 151: heat source interface; 152: condensed water outlet; 16: heat source pipeline; 17: screw conveyor; 18: scraper; 20: gas collection hood; 30: gas purification device; 31: air inlet; 32: exhaust port; 33: spray tower; 331: liquid storage area; 3 32: nozzle; 34: induced draft assembly; 341: induced draft fan; 342: air inlet duct; 343: air supply duct; 35: second pump body; 36: packing layer; 37: heat exchanger; 38: liquid replenishing port; 40: waste liquid buffer tank; 41: stirring assembly; 50: first pump body; 51: first liquid level gauge; 60: first pipeline; 70: second pipeline; 71: valve member; 72: temperature sensor; 73: second liquid level gauge; 80: third pipeline;

[0032] 200: Evaporation crystallization system; 201: Evaporation crystallization equipment. DETAILED DESCRIPTION

[0033] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0034] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0036] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] Unless otherwise stated, the term "plurality" means two or more.

[0038] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0039] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0041] In the magnesium desulfurization process, evaporation and crystallization equipment can be used to concentrate and crystallize the by-products produced in the desulfurization process to achieve resource utilization. For example, magnesium sulfate heptahydrate can be recovered. In actual operation, the waste liquid generated by the evaporation and crystallization process needs to be discharged, resulting in the failure to completely treat the magnesium desulfurization wastewater.

[0042] In view of this, if Figures 1 to 5As shown, an embodiment of the present disclosure provides a waste liquid drying and purification device 100. The waste liquid drying and purification device 100 includes a drying unit 10, an air collecting hood 20 and a gas purification device 30. The drying unit 10 includes a shell 11 having an opening 111. The drying unit 10 is used to dry the waste liquid to obtain dry material. The air collecting hood 20 is arranged at the opening 111 of the shell 11, and the air collecting hood 20 is used to collect the steam generated by the drying unit 10 when drying the waste liquid. The gas purification device 30 includes an air inlet 31 and an exhaust port 32. The air inlet 31 of the gas purification device 30 is connected to the air collecting hood 20, and the gas purification device 30 can purify the steam and discharge the purified gas from the exhaust port 32.

[0043] In this embodiment, the waste liquid is dried by the drying unit 10 to reduce the water content of the viscous material to obtain dry material, so that the salts in the waste liquid can be discharged from the factory in a solid state. The drying unit 10 includes a housing 11 having an opening 111, and the gas collecting hood 20 is arranged at the opening 111, so that the steam generated by the drying unit 10 when drying the waste liquid can flow to the gas collecting hood 20 to collect the steam.

[0044] In this embodiment, the gas purification device 30 includes an air inlet 31 and an exhaust port 32. The air inlet 31 is connected to the gas collecting hood 20, so that the steam collected by the gas collecting hood 20 can enter the gas purification device 30 through the air inlet 31. The gas purification device 30 purifies the steam and discharges the purified gas from the exhaust port 32, for example, into the atmosphere, to achieve dry purification of the waste liquid.

[0045] Compared with the related art that discharges the waste liquid generated by the evaporation and crystallization process, this application processes the waste liquid into dry materials discharged from the factory in a solid state and harmless gases discharged into the atmosphere in a gaseous state, effectively reducing the amount of waste liquid discharged from the factory in a liquid state, improving the wastewater treatment effect, and effectively achieving "zero discharge" of industrial wastewater treatment.

[0046] "Zero discharge" of wastewater can be understood as: salts in wastewater are discharged from the factory in solid form. For example, they are sent to a waste treatment plant for landfill or recycled as useful chemical raw materials, and are basically not discharged from the factory in liquid form.

[0047] Alternatively, if Figure 1 As shown, the opening 111 of the housing 11 is located at the top of the drying unit 10. The air collecting hood 20 is disposed at the opening 111, so that the air collecting hood 20 is located at the top of the drying unit 10, improving the smoothness of the steam flowing to the air collecting hood 20.

[0048] Alternatively, if Figure 1As shown, the gas collecting hood 20 includes a first port and a second port. The first port is connected to the opening 111 of the housing 11. The second port is connected to the air inlet 31 of the gas purification device 30. The area of ​​the first port is larger than the area of ​​the second port. Along the direction from the first port to the second port, the side wall of the gas collecting hood 20 gradually shrinks.

[0049] In this embodiment, the steam generated by the drying unit 10 when drying the waste liquid flows smoothly into the gas purification device 30 through the first port and the second port. The area of ​​the first port is larger than the area of ​​the second port, so that the steam flows through the first port along the inner wall of the gas collecting hood 20 to the second port, which is convenient for collecting the steam.

[0050] In this embodiment, the side wall of the gas collecting hood 20 gradually shrinks along the direction from the first opening to the second opening. Figure 1 As shown, along the direction from bottom to top, the side wall of the gas collecting hood 20 gradually shrinks to allow the steam to flow smoothly in the gas collecting hood 20.

[0051] In this embodiment, the gas collecting hood 20 cooperates with the gas purification device 30 to improve the processing efficiency of steam, thereby improving the efficiency of drying and purifying the waste liquid.

[0052] Optionally, the air collecting hood 20 is sealedly connected to the opening 111 of the housing 11. For example, a rubber ring is provided at the connection between the air collecting hood 20 and the opening 111 of the housing 11 to prevent or reduce the steam generated by the drying unit 10 drying the waste liquid from directly flowing into the atmosphere.

[0053] Optionally, the material of the gas collecting hood 20 includes duplex stainless steel, for example, 2205 stainless steel.

[0054] In some embodiments, Figure 1 and Figure 3 As shown, the waste liquid drying and purification device 100 further includes a waste liquid buffer tank 40 and a stirring assembly 41. The waste liquid buffer tank 40 is connected to the drying unit 10, and the waste liquid buffer tank 40 is used to provide waste liquid to the drying unit 10. The stirring assembly 41 is disposed in the waste liquid buffer tank 40, and the stirring assembly 41 is used to stir the waste liquid.

[0055] In this embodiment, the waste liquid buffer tank 40 is connected to the drying unit 10. Specifically, Figure 3 A in the figure indicates the outlet of the waste liquid buffer tank 40, and the outlet of the waste liquid buffer tank 40 is connected to the feed port 14 of the drying unit 10, so that the waste liquid buffer tank 40 provides waste liquid for the drying unit 10. The stirring component 41 is arranged in the waste liquid buffer tank 40. In other words, the waste liquid buffer tank 40 is provided with a stirring component 41, and the paddles of the stirring component 41 extend into the waste liquid, so that the waste liquid in the waste liquid buffer tank 40 is stirred by the paddles of the stirring component 41, thereby providing the drying unit 10 with evenly stirred waste liquid, thereby improving the waste liquid treatment effect and efficiency.

[0056] A specific application example, when applied to the evaporation crystallization process, the inlet of the waste liquid buffer tank 40 can be connected to the discharge port of the evaporation crystallization device 201, so that the waste liquid generated during the evaporation crystallization process enters the waste liquid buffer tank 40 from the discharge port for buffering, and can provide a stable flow of waste liquid for the drying unit 10. The waste liquid in the waste liquid buffer tank 40 is stirred by the stirring component 41 to prevent or reduce solid precipitation in the waste liquid, provide the drying unit 10 with uniformly stirred waste liquid, and improve the waste liquid treatment effect and efficiency.

[0057] Optionally, the stirring assembly 41 includes a stirrer. The stirrer is installed in the waste liquid buffer tank 40. The paddles of the stirrer extend into the waste liquid to stir the waste liquid.

[0058] It is understandable that the stirring component 41 is not limited to a stirrer, and can achieve stirring of waste liquid. For example, the stirring component 41 includes a driving member, a connecting rod and a paddle. The driving member (for example, a motor) is installed in the waste liquid buffer tank 40. The driving end of the driving member is connected to the connecting rod. One end of the connecting rod away from the driving member is connected to the paddle. The paddle is located in the waste liquid. The driving end of the driving member rotates, driving the connecting rod to rotate around its own axis to drive the paddle to rotate, thereby stirring the waste liquid.

[0059] Optionally, the impeller of the mixer comprises duplex stainless steel, for example, 2205 stainless steel.

[0060] Optionally, the material of the waste liquid buffer tank 40 includes duplex stainless steel, for example, 2205 stainless steel.

[0061] In some embodiments, Figure 1 and Figure 2 As shown, the waste liquid drying and purification device 100 also includes a first pump body 50, a first liquid level meter 51 and a controller. The inlet of the first pump body 50 is connected to the waste liquid buffer tank 40, and the outlet of the first pump body 50 is connected to the feed port 14 of the drying unit 10. The first liquid level meter 51 is arranged in the drying unit 10, and is used to detect the liquid level of the waste liquid in the drying unit 10. The signal input end of the controller is electrically connected to the first liquid level meter 51, and the signal output end of the controller is electrically connected to the first pump body 50. The controller is used to control the feeding flow rate of the first pump body 50 according to the liquid level detected by the first liquid level meter 51.

[0062] In this embodiment, the inlet of the first pump body 50 is connected to the waste liquid buffer tank 40, and the outlet of the first pump body 50 is connected to the feed port 14 of the drying unit 10. Figure 1As shown, the arrow on the connecting pipeline between the first pump body 50 and the drying unit 10 is used to indicate the flow direction of the waste liquid. Specifically, the inlet of the first pump body 50 is connected to the outlet of the waste liquid buffer tank 40, and the outlet of the first pump body 50 is connected to the feed port 14 of the drying unit 10. The waste liquid in the waste liquid buffer tank 40 is stably fed into the drying unit 10 through the first pump body 50.

[0063] In this embodiment, the first liquid level gauge 51 is provided in the drying unit 10, so that the first liquid level gauge 51 can detect the liquid level of the waste liquid in the drying unit 10. The signal input end of the controller is electrically connected to the first liquid level gauge 51, and the signal output end of the controller is electrically connected to the first pump body 50. The controller is used to control the feeding flow of the first pump body 50 according to the liquid level detected by the first liquid level gauge 51, so that the waste liquid in the drying unit 10 is continuously at the target liquid level, so that the drying unit 10 performs a stable drying process on the waste liquid. It can be understood that the specific type of the first liquid level gauge 51 is not limited, and it can be selected according to needs.

[0064] Exemplarily, when the liquid level detected by the first liquid level meter 51 is lower than the target liquid level, the feeding flow rate of the first pump body 50 is increased until the liquid level detected by the first liquid level meter 51 is equal to the target liquid level, and the first pump body 50 is controlled to operate at a preset feeding flow rate.

[0065] Exemplarily, when the liquid level detected by the first liquid level meter 51 is higher than the target liquid level, the feeding flow rate of the first pump body 50 is reduced until the liquid level detected by the first liquid level meter 51 is equal to the target liquid level, and the first pump body 50 is controlled to operate at a preset feeding flow rate.

[0066] It is understood that the specific type of the first pump body 50 is not limited. The specific manner in which the controller controls the feeding flow rate of the first pump body 50 is not limited. For example, the first pump body 50 can use a variable frequency pump, and the feeding flow rate is controlled by adjusting the frequency of the variable frequency pump.

[0067] In this embodiment, the controller includes a chip with logic operation capability and a circuit corresponding to the chip, and the control center includes one or more signal input terminals, and one or more signal output terminals. For example, the control center is a single-chip microcomputer system, which includes a single-chip microcomputer chip of a certain model and a power supply circuit, a crystal oscillator circuit, etc. corresponding to the single-chip microcomputer chip of the model, and the single-chip microcomputer system includes an input terminal / output terminal directly connected to the pin of the single-chip microcomputer chip, and an input terminal / output terminal indirectly connected to the pin of the single-chip microcomputer through a signal adapter (such as a relay); or the control center is a programmable logic controller (PLC) system, and the PLC system includes a central processing unit (CPU) module, an analog input module, an analog output module, a digital input module, and a digital output module.

[0068] Optionally, the material of the flow-through portion (the portion in contact with the waste liquid) of the first pump body 50 is a corrosion-resistant material. The corrosion-resistant material includes duplex stainless steel, for example, 2205 stainless steel.

[0069] In some embodiments, Figures 1 to 3 As shown, the drying unit 10 also includes a waste return port 12. The waste liquid drying and purification device 100 also includes a first pipeline 60. One end of the first pipeline 60 is connected to the waste return port 12, and the other end of the first pipeline 60 is connected to the waste liquid buffer tank 40. The first pipeline 60 is used to return the waste liquid in the drying unit 10 to the waste liquid buffer tank 40.

[0070] In this embodiment, Figure 1 As shown, the arrow on the first pipeline 60 indicates the flow direction of the waste liquid in the first pipeline 60. One end of the first pipeline 60 is connected to the waste material reflux port 12, and the other end of the first pipeline 60 is connected to the waste liquid buffer tank 40. The waste liquid in the drying unit 10 is refluxed into the waste liquid buffer tank 40 through the first pipeline 60 for stirring and mixing. After the waste liquid refluxed into the waste liquid buffer tank 40 is evenly stirred with the waste liquid in the waste liquid buffer tank 40, it re-enters the drying unit 10 for drying treatment, thereby improving the waste liquid treatment effect.

[0071] In a specific application example, when the liquid tank 13 in the drying unit 10 contains waste liquid, a waste material return port 12 is provided at the lower part or bottom of the liquid tank 13. The waste liquid in the drying unit 10 is returned to the waste liquid buffer tank 40, and a waste liquid flow cycle is formed between the waste liquid buffer tank 40 and the drying unit 10, so as to prevent or reduce the deposition of solids in the waste liquid in the liquid tank 13, improve the effect of drying the waste liquid, obtain dry materials with uniform composition, facilitate subsequent treatment, and reduce the cost of wastewater treatment.

[0072] Optionally, a pump is provided in the first pipeline 60. The waste liquid in the drying unit 10 is sent to the waste liquid buffer tank 40 through the first pipeline 60 by the pump. The pump is connected to the controller, and the controller controls the opening and closing of the pump.

[0073] Optionally, the first pipeline 60 is provided with a valve. The first pipeline 60 is controlled to be on and off by the valve. When the valve is open, a waste liquid flow cycle can be formed between the waste liquid buffer tank 40 and the drying unit 10. When the valve is closed, the waste liquid in the drying unit 10 will not flow back to the waste liquid buffer tank 40.

[0074] In some embodiments, Figure 2 As shown, the drying unit 10 also includes a liquid tank 13 and a drum 15. The liquid tank 13 is arranged inside the shell 11. The liquid tank 13 includes a feed port 14. The liquid tank 13 is used to hold waste liquid. The drum 15 is rotatably arranged in the shell 11. Part of the surface of the drum 15 is located in the liquid tank 13 and in contact with the waste liquid. The drum 15 includes a heating chamber and a heat source interface 151 connected to the heating chamber. Among them, the heat source interface 151 is used to communicate with a heat source to heat the drum 15 during the rotation of the drum 15 relative to the shell 11, dry the waste liquid, and obtain dry materials.

[0075] In this embodiment, the liquid tank 13 is disposed inside the housing 11, and includes a feed port 14. When used, the waste liquid stirred evenly in the waste liquid buffer tank 40 is sent to the liquid tank 13 through the first pump body 50 for storage, in preparation for drying the waste liquid.

[0076] In this embodiment, the drum 15 is rotatably disposed in the shell 11, that is, the drum 15 is located in the shell 11 and can rotate relative to the shell 11. It can be understood that the specific manner in which the drum 15 is rotatably disposed in the shell 11 is not limited. Exemplarily, the drying unit 10 also includes a bracket and a power device (e.g., a motor). The bracket is fixed to the shell 11, and the bracket includes a rotating shaft. The drum 15 is mounted on the rotating shaft. The power output end of the power device is connected to the rotating shaft. The power output end of the power device drives the rotating shaft to rotate, so as to drive the drum 15 to rotate relative to the bracket, and then the drum 15 rotates relative to the shell 11.

[0077] In this embodiment, part of the surface of the drum 15 is located in the liquid tank 13 and in contact with the waste liquid, so that the waste liquid can adhere to the surface of the drum 15 during the rotation of the drum 15. The drum 15 includes a heating chamber and a heat source interface 151 connected to the heating chamber. Specifically, the drum 15 defines a heating chamber. In actual application, the heat source interface 151 can be connected to a heat source so that the heat source enters the heating chamber through the heat source interface 151 to heat the drum 15. During the rotation of the drum 15 relative to the shell 11, the surface of the part of the drum 15 in contact with the waste liquid can adhere to the waste liquid. As the drum 15 rotates, the drum 15 brings the adhered waste liquid out of the liquid tank 13. At this time, the heated drum 15 dries the waste liquid adhered to the surface of the drum 15 to obtain dry material.

[0078] Optionally, the heat source comprises high temperature water or steam.

[0079] Alternatively, if Figure 2 As shown, the drum 15 also includes a condensed water outlet 152. When the heat source heats the drum 15 to dry the waste liquid, the heat source generates condensed water. The condensed water generated by the heat source flows out from the condensed water outlet 152. In practical applications, the condensed water can be collected and utilized.

[0080] Alternatively, if Figure 1 As shown, the waste liquid drying and purification device 100 further includes a heat source pipeline 16. The heat source pipeline 16 is used to connect the heat source interface 151 of the drum 15 with an external heat source, so that the heat source enters the heating chamber of the drum 15 to heat the drum 15.

[0081] Alternatively, if Figure 1 , Figure 2 and Figure 5 As shown, the drying unit 10 further includes a scraper 18 and a screw conveyor 17. The scraper 18 is located on one side of the drum 15, and the scraper 18 can contact the surface of the drum 15. The screw conveyor 17 is disposed below the scraper 18. The screw conveyor 17 includes a collecting trough.

[0082] In this embodiment, Figure 1 , Figure 2 and Figure 5 As shown, the arrow below the screw conveyor 17 is used to indicate that the screw conveyor 17 delivers the dry material. During the rotation of the drum 15 relative to the housing 11, the scraper 18 can peel off the dry material on the surface of the drum 15 and make the dry material fall into the collecting trough of the screw conveyor 17. A storage bag may be provided at the end of the collecting trough, and the storage bag is used to collect the dry material delivered by the screw conveyor 17, that is, the screw conveyor 17 delivers the dry material into the storage bag.

[0083] Optionally, the drying unit 10 further comprises an electric hoist, which is used to transport the storage bags filled with dry materials out of the factory.

[0084] Optionally, the drying unit 10 comprises a drum dryer.

[0085] In this embodiment, the drum dryer can dry the waste liquid to obtain dry material.

[0086] Optionally, the material of the components in contact with the waste liquid in the drying unit 10 includes duplex stainless steel, for example, 2205 stainless steel.

[0087] In a specific application example, the water content of the waste liquid of evaporation and crystallization is 60% to 70%. After the waste liquid enters the waste liquid buffer tank 40, it is transported to the liquid tank 13 of the drying unit 10 by the first pump body 50. The drum 15 rotates relative to the shell 11, and when the surface of the drum 15 contacts the waste liquid in the liquid tank 13, the waste liquid adheres to the surface of the drum 15. The thickness of the material layer on the surface of the drum 15 can be adjusted by the pressure roller provided on the drum 15. The internal heat of the drum 15 is transferred to the material layer, so that the material layer is gradually dried to form a dry material. The water content of the dried dry material is 3% to 5%, and the dry material is a powdered solid. The water content of the waste liquid of evaporation and crystallization is reduced, and the wastewater treatment effect is improved.

[0088] In this example, the waste liquid is dried by the drying unit 10, and the solid components in the waste liquid are solidified into powder for easy transportation and disposal. At the same time, the waste liquid is heated and evaporated by the drying unit 10 to form steam, which is collected by the gas collecting hood 20 and enters the gas purification device 30 for purification (for example, condensation and cooling, deodorization), and then discharged into the atmosphere after purification, achieving "zero discharge" of desulfurization waste liquid.

[0089] In some embodiments, Figure 1 and Figure 4 As shown, the gas purification device 30 includes a spray tower 33, an air induction assembly 34 and a second pump body 35. The spray tower 33 includes a liquid storage area 331 and a nozzle 332. The nozzle 332 is located above the liquid storage area 331. The spray tower 33 is provided with an air inlet 31 and an exhaust port 32. The air inlet 31 is located between the liquid storage area 331 and the nozzle 332, and the exhaust port 32 is located at the top of the spray tower 33. The air inlet of the air induction assembly 34 is connected to the gas collecting hood 20, and the air outlet of the air induction assembly 34 is connected to the air inlet 31. The inlet of the second pump body 35 is connected to the liquid storage area 331, and the outlet of the second pump body 35 is connected to the nozzle 332 to provide spray liquid for the nozzle 332. Among them, the air induction assembly 34 is used to send steam into the spray tower 33, and the steam contacts the spray liquid sprayed from the nozzle 332 during the process of flowing from the air inlet 31 to the exhaust port 32 to achieve gas purification.

[0090] In this embodiment, the spray tower 33 includes a liquid storage area 331 and a nozzle 332. The nozzle 332 is located above the liquid storage area 331, so that the liquid storage area 331 can not only store liquid, but also receive the liquid sprayed from the nozzle 332. Specifically, after the liquid sprayed from the nozzle 332 contacts the gas, it flows downward to the liquid storage area 331 for recovery, thereby realizing the recycling of the liquid and saving costs. In actual application, the liquid storage area 331 can be located at the bottom of the spray tower 33 to facilitate the storage of liquid. The type of liquid in the liquid storage area 331 is not limited and can be selected as needed. For example, water is stored in the liquid storage area 331 to cool the steam and absorb ammonia in the steam.

[0091] In this embodiment, the spray tower 33 is provided with an air inlet 31 and an air outlet 32, so that the steam enters the spray tower 33 from the air inlet 31 and exits from the air outlet 32 ​​after being purified in the spray tower 33. The air inlet 31 is located between the liquid storage area 331 and the nozzle 332, so that the steam entering the spray tower 33 can contact the liquid sprayed from the nozzle 332 during the process of flowing to the air outlet 32, so as to achieve purification. Figure 5 In the figure, the upward arrow at the exhaust port 32 indicates the exhaust direction of the purified gas. The exhaust port 32 is located at the top of the spray tower 33, which is convenient for the purified gas to be discharged into the atmosphere. The air inlet of the induced draft component 34 is connected to the gas collecting hood 20, and the air outlet of the induced draft component 34 is connected to the air inlet 31 of the spray tower 33, so that the induced draft component 34 can send the steam collected by the gas collecting hood 20 into the spray tower 33.

[0092] In this embodiment, Figure 4 As shown, the arrows on the connecting pipeline between the second pump body 35 and the liquid storage area 331 and the connecting pipeline between the second pump body 35 and the nozzle 332 are used to indicate the direction in which the second pump body 35 delivers the liquid. The inlet of the second pump body 35 is connected to the liquid storage area 331, and the outlet of the second pump body 35 is connected to the nozzle 332 to provide spraying liquid for the nozzle 332. In other words, the second pump body 35 circulates the liquid in the liquid storage area 331 to the nozzle 332, so that the nozzle 332 sprays liquid to purify the steam. In actual application, the specific type of the second pump body 35 is not limited, for example, a variable frequency pump is used.

[0093] Optionally, the induced draft assembly 34 includes an induced draft fan 341. The air inlet of the induced draft fan 341 is connected to the gas collecting hood 20, and the air outlet of the induced draft fan 341 is connected to the air inlet 31 of the spray tower 33, so as to deliver the steam collected by the gas collecting hood 20 to the spray tower 33. When the induced draft fan 341 is in operation, the drying unit 10 is in a slightly negative pressure state, so as to deliver the steam generated by the drying unit 10 drying the waste liquid to the gas purification device 30. In actual application, the material of the part of the induced draft fan 341 that contacts the steam can be made of duplex stainless steel. For example, 2205 stainless steel.

[0094] Optionally, the air induction assembly 34 further includes an air inlet duct 342 and an air supply duct 343. Figure 1 In the figure, arrows on the air inlet duct 342 and the air supply duct 343 are used to indicate the flow direction of the steam. The air inlet of the induced draft fan 341 is connected to the air collecting hood 20 through the air inlet duct 342, and the air outlet of the induced draft fan 341 is connected to the air inlet 31 of the spray tower 33 through the air supply duct 343, so as to send the steam collected by the air collecting hood 20 into the spray tower 33.

[0095] Optionally, the gas purification device 30 further includes a heat exchanger 37. The heat exchanger 37 is disposed on a pipeline connecting the outlet of the second pump body 35 and the nozzle 332. The heat exchanger 37 is also connected to external circulating cooling water. The heat exchanger 37 is used to exchange heat with the spray liquid sent by the second pump body 35 to cool the spray liquid, thereby cooling the steam sent to the spray tower 33. It can be understood that the specific type of the heat exchanger 37 is not limited, for example, a plate heat exchanger 37.

[0096] Alternatively, if Figure 1 and Figure 4 As shown, a packing layer 36 is provided inside the spray tower 33. The packing layer 36 is located below the nozzle 332 and is used to increase the contact area between the steam and the spray liquid and improve the gas purification effect.

[0097] In actual application, the outer wall of the spray tower 33 can be made of polypropylene (PP) to reduce weight, reduce costs, and achieve high temperature resistance (for example, 120° C.).

[0098] In some embodiments, Figure 1 and Figure 4 As shown, the waste liquid drying and purification device 100 also includes a second pipeline 70, a valve component 71, a temperature sensor 72 and / or a second liquid level gauge 73. One end of the second pipeline 70 is connected to the outlet of the second pump body 35, and the other end of the second pipeline 70 is connected to the drying unit 10 (the connection part between the second pipeline 70 and the drying unit 10 is not shown in the figure). The valve component 71 is arranged in the second pipeline 70, and the valve component 71 is electrically connected to the signal output end of the controller. The temperature sensor 72 and / or the second liquid level gauge 73 are arranged in the spray tower 33 and are electrically connected to the signal input end of the controller. The temperature sensor 72 is used to detect the temperature of the liquid in the liquid storage area 331. The second liquid level gauge 73 is used to detect the liquid level of the liquid in the liquid storage area 331. Among them, the controller is used to control the opening and closing of the valve component 71 according to the temperature detected by the temperature sensor 72 and / or the liquid level detected by the second liquid level gauge 73.

[0099] In this embodiment, the waste liquid drying and purification device 100 further includes a second pipeline 70, a valve component 71, a temperature sensor 72 and / or a second liquid level gauge 73. That is, the waste liquid drying and purification device 100 further includes a second pipeline 70, a valve component 71 and a temperature sensor 72. Alternatively, the waste liquid drying and purification device 100 further includes a second pipeline 70, a valve component 71 and a second liquid level gauge 73. Alternatively, the waste liquid drying and purification device 100 further includes a second pipeline 70, a valve component 71, a temperature sensor 72 and a second liquid level gauge 73.

[0100] In this embodiment, one end of the second pipeline 70 is connected to the outlet of the second pump body 35, and the other end of the second pipeline 70 is connected to the drying unit 10 to deliver the liquid in the liquid storage area 331 to the drying unit 10 for drying. Specifically, the end of the second pipeline 70 away from the second pump body 35 can be connected to the feed port 14 of the drying unit 10 to deliver the liquid in the liquid storage area 331 to the liquid tank 13. The liquid storage area 331 can hold the spray liquid in contact with the steam. As the liquid absorbs and purifies the gas, the concentration and temperature of the liquid in the liquid reservoir gradually increase. The liquid in the liquid storage area 331 is delivered to the drying unit 10 for treatment, so as to achieve the treatment of the liquid after the gas is purified, and further achieve "zero discharge" of wastewater treatment. In actual application, the end of the second pipeline 70 away from the outlet of the second pump body 35 can also be connected to the waste liquid buffer tank 40 and / or the evaporation crystallization equipment 201 to transport the liquid after the gas is purified to the waste liquid buffer tank 40 and / or the evaporation crystallization equipment 201, so that the liquid after the gas is purified can re-enter the treatment cycle to improve the wastewater treatment effect.

[0101] In this embodiment, the valve member 71 is arranged in the second pipeline 70, and the valve member 71 is electrically connected to the signal output end of the controller. The opening and closing of the valve member 71 is controlled by the controller, thereby controlling the on and off of the second pipeline 70. The temperature sensor 72 is arranged in the spray tower 33, so that the temperature sensor 72 can detect the temperature of the liquid in the liquid storage area 331. The temperature sensor 72 is electrically connected to the signal input end of the controller, so that the controller can obtain the temperature detected by the temperature sensor 72. The second liquid level meter 73 is arranged in the spray tower 33, so that the second liquid level meter 73 can detect the liquid level of the liquid in the liquid storage area 331. The second liquid level meter 73 is electrically connected to the signal input end of the controller, so that the controller can obtain the liquid level detected by the second liquid level meter 73. Then, the controller controls the opening and closing of the valve member 71 according to the temperature detected by the temperature sensor 72 and / or the liquid level detected by the second liquid level meter 73. For example, when the temperature detected by the temperature sensor 72 is greater than or equal to the temperature threshold, the controller controls the valve member 71 to open. For another example, when the liquid level detected by the second liquid level gauge 73 is greater than or equal to the liquid level threshold, the controller controls the valve member 71 to open. For another example, when the temperature detected by the temperature sensor 72 is greater than or equal to the temperature threshold, and the liquid level detected by the second liquid level gauge 73 is greater than or equal to the liquid level threshold, the controller controls the valve member 71 to open. In this embodiment, the specific type of the second liquid level gauge 73 is not limited. For example, a differential pressure level gauge.

[0102] It can be understood that one or more controllers can be provided. In the case where one controller can be provided, the controller in this embodiment is the controller of the aforementioned embodiment. In the case where multiple controllers can be provided, the controller in this embodiment can be provided separately, and the controller is connected to the valve member 71 to control the opening and closing of the valve member 71, and is also connected to the temperature sensor 72 and / or the second liquid level meter 73 to obtain the temperature detected by the temperature sensor 72 and / or the liquid level detected by the second liquid level meter 73.

[0103] Optionally, the valve member 71 comprises a solenoid valve.

[0104] Alternatively, if Figure 4 As shown, the spray tower 33 further includes a liquid replenishing port 38 , through which liquid (eg, water) can be replenished into the liquid storage area 331 .

[0105] In a specific application example, when the temperature of the liquid in the liquid storage area 331 detected by the temperature sensor 72 is greater than or equal to the temperature threshold, the controller controls the valve member 71 to open to discharge the liquid in the liquid storage area 331. At the same time, liquid is replenished into the liquid storage area 331 through the liquid replenishing port 38.

[0106] In some embodiments, Figure 4As shown, the waste liquid drying and purification device 100 further includes a third pipeline 80. One end of the third pipeline 80 is connected to the air outlet of the air induction assembly 34, and the other end of the third pipeline 80 passes through the air inlet 31 of the spray tower 33 and extends into the liquid in the liquid storage area 331.

[0107] In this embodiment, one end of the third pipeline 80 is connected to the air outlet of the air induction assembly 34, and the other end of the third pipeline 80 passes through the air inlet 31 of the spray tower 33 and extends into the liquid in the liquid storage area 331, so that the steam generated by the drying unit 10 drying the waste liquid can be directly sent into the liquid in the liquid storage area 331, so that the liquid performs the first cooling and absorption purification on the steam. In the process of the gas overflowing from the liquid in the liquid storage area 331 flowing to the exhaust port 32, it contacts the liquid sprayed from the nozzle 332 and performs the second cooling and absorption purification. Through the two cooling and absorption purification, the cooling and absorption purification effect of the steam is improved.

[0108] like Figure 4 As shown, when the induced draft assembly 34 includes an induced draft fan 341, one end of the third pipeline 80 is connected to the air outlet of the induced draft fan 341, and the other end of the third pipeline 80 passes through the air inlet 31 of the spray tower 33 and extends into the liquid in the liquid storage area 331, so as to directly deliver the steam generated by the drying unit 10 when drying the waste liquid into the liquid in the liquid storage area 331.

[0109] like Figures 1 to 5 As shown, the embodiment of the present disclosure also provides an evaporation crystallization system 200. The evaporation crystallization system 200 includes an evaporation crystallization device 201 and a waste liquid drying and purification device 100 as in any of the previous embodiments. The evaporation crystallization device 201 includes a discharge port, which is used to discharge waste liquid. The waste liquid drying and purification device 100 is connected to the discharge port of the evaporation crystallization device 201.

[0110] In this embodiment, the evaporation crystallization system 200 includes an evaporation crystallization device 201 and a waste liquid drying and purification device 100 as in any of the previous embodiments, so that the waste liquid discharged from the evaporation crystallization device 201 enters the waste liquid drying and purification device 100 for treatment to obtain dry material, and the purified gas is discharged into the atmosphere, thereby achieving "zero emission" of industrial wastewater treatment.

[0111] The evaporation crystallization system 200 of this embodiment includes the waste liquid drying and purification device 100 of any of the aforementioned embodiments. Therefore, the evaporation crystallization system 200 of this embodiment has all the beneficial effects of the aforementioned waste liquid drying and purification device 100, which will not be described in detail.

[0112] In a specific application example, the evaporation crystallization device 201 includes an evaporator, a freezing crystallization tank and a centrifuge. The centrifuge can output salt and waste liquid. In practical applications, the waste liquid discharged from the evaporation crystallization device 201 enters the waste liquid drying and purification device 100. Specifically, the waste liquid discharged from the centrifuge enters the waste liquid drying and purification device 100 to perform drying and purification treatment to obtain dry materials, and the purified gas is discharged into the atmosphere to achieve "zero discharge" of industrial wastewater treatment.

[0113] Combination Figures 1 to 6 As shown, the embodiment of the present disclosure also provides an evaporation crystallization process method, which uses the evaporation crystallization system 200 as described above to process the desulfurized liquid, including the following steps:

[0114] S601, the evaporation and crystallization equipment evaporates and crystallizes the desulfurized liquid to generate waste liquid.

[0115] In this embodiment, the desulfurized liquid is evaporated and crystallized by the evaporation and crystallization equipment 201 to achieve resource recycling, for example, to achieve the recycling of magnesium sulfate heptahydrate.

[0116] S602, sending the waste liquid to a waste liquid drying and purification device for drying and purification, wherein the drying unit dries the waste liquid to obtain dry material, and the gas purification device purifies the steam generated by the drying unit drying the waste liquid, and discharges the purified gas.

[0117] In this embodiment, the waste liquid generated during the evaporation and crystallization process is sent to the waste liquid drying and purification device 100 for drying and purification to obtain dry materials, and the purified gas is discharged into the atmosphere to achieve "zero emission" of industrial wastewater treatment.

[0118] A specific application example:

[0119] The magnesium-based desulfurization wastewater from the flue gas of a steel plant pelletizing workshop has a density of about 1.26 g / cm after evaporation and crystallization treatment in the relevant technology to obtain a viscous liquid (waste liquid). 3 , the water content is about 65%. The viscous liquid has complex components and is highly corrosive. Moreover, the viscous liquid produced after the evaporation and crystallization process is running blocks the evaporation and crystallization equipment and the material transfer pipeline, making it impossible to continue to concentrate and separate salts, resulting in the inability to achieve "zero discharge" of wastewater. The viscous liquid is dried and purified by the waste liquid drying and purification device 100 of the present application, and the water content of the dry material is 5%. The water content of the viscous liquid is further reduced to achieve "zero discharge" of wastewater. The dry material is subjected to full element analysis, and the dry material contains 25.2g / kg of sulfate, 139.4g / kg of chloride, 134.4g / kg of magnesium, 13.0g / kg of sodium, 1.9g / kg of calcium, 1.3g / kg of potassium, and the concentrations of other metal ions are all lower than 0.005g / kg. The viscous liquid is recycled through the present application, and "zero discharge" of wastewater is achieved.

[0120] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A waste liquid drying and purification device, characterized in that: include: A drying unit, comprising a shell having an opening, wherein the drying unit is used to dry the waste liquid to obtain dry material; A gas collecting hood, arranged at the opening, for collecting steam generated by the drying unit drying waste liquid; The gas purification device comprises an air inlet and an exhaust port, wherein the air inlet is connected to the gas collecting hood, and the gas purification device can purify the steam and discharge the purified gas from the exhaust port.

2. The waste liquid drying and purification device according to claim 1, characterized in that: Also includes: A waste liquid buffer tank, connected to the drying unit, for providing waste liquid to the drying unit; A stirring component is arranged in the waste liquid buffer tank and is used for stirring the waste liquid.

3. The waste liquid drying and purification device according to claim 2, characterized in that: Also includes: A first pump body, wherein the inlet of the first pump body is connected to the waste liquid buffer tank, and the outlet of the first pump body is connected to the feed inlet of the drying unit; A first liquid level meter, disposed in the drying unit, for detecting the liquid level of the waste liquid in the drying unit; A controller, wherein a signal input end of the controller is electrically connected to the first liquid level meter, and a signal output end of the controller is electrically connected to the first pump body, and the controller is used to control the feeding flow of the first pump body according to the liquid level detected by the first liquid level meter.

4. The waste liquid drying and purification device according to claim 2, characterized in that: The drying unit further includes a waste return port, and the waste liquid drying and purification device further includes: A first pipeline, one end of which is connected to the waste material reflux port, and the other end of which is connected to the waste liquid buffer tank. The first pipeline is used to allow the waste liquid in the drying unit to flow back into the waste liquid buffer tank.

5. The waste liquid drying and purification device according to any one of claims 1 to 4, characterized in that: The drying unit further comprises: A liquid tank is arranged inside the shell, including the feed port, and is used to hold waste liquid; A drum is rotatably disposed in the shell, a portion of the surface of the drum is located in the liquid tank and in contact with the waste liquid, and the drum includes a heating chamber and a heat source interface connected to the heating chamber; The heat source interface is used to communicate with a heat source so as to heat the drum during the rotation of the drum relative to the shell, dry the waste liquid, and obtain dry materials.

6. The waste liquid drying and purification device according to any one of claims 1 to 4, characterized in that: The gas purification device comprises: A spray tower, comprising a liquid storage area and a nozzle, wherein the nozzle is located above the liquid storage area, and the spray tower is provided with an air inlet and an exhaust port, wherein the air inlet is located between the liquid storage area and the nozzle, and the exhaust port is located at the top of the spray tower; An air inlet of the air inlet assembly is connected to the air collecting hood, and an air outlet is connected to the air inlet; a second pump body, wherein the inlet of the second pump body is connected to the liquid storage area, and the outlet of the second pump body is connected to the nozzle to provide spraying liquid to the nozzle; The draft assembly is used to deliver steam into the spray tower. When the steam flows from the air inlet to the exhaust port, the steam contacts the spray liquid sprayed from the nozzle to achieve gas purification.

7. The waste liquid drying and purification device according to claim 6, characterized in that: Also includes: a second pipeline, one end of which is connected to the outlet of the second pump body, and the other end of which is connected to the drying unit; A valve member, disposed in the second pipeline and electrically connected to a signal output terminal of the controller; A temperature sensor and / or a second liquid level meter, which is arranged in the spray tower and is electrically connected to the signal input terminal of the controller, wherein the temperature sensor is used to detect the temperature of the liquid in the liquid storage area, and the second liquid level meter is used to detect the liquid level of the liquid in the liquid storage area; Wherein, the controller is used to control the opening and closing of the valve member according to the temperature detected by the temperature sensor and / or the liquid level detected by the second liquid level meter.

8. The waste liquid drying and purification device according to claim 6, characterized in that: Also includes: A third pipeline, one end of which is connected to the air outlet of the air induced component, and the other end of which passes through the air inlet of the spray tower and extends into the liquid in the liquid storage area.

9. An evaporation crystallization system, characterized in that: include: The evaporation crystallization device includes a discharge port for discharging waste liquid; The waste liquid drying and purification device according to any one of claims 1 to 8, which is connected to the discharge port of the evaporation crystallization equipment.

10. An evaporation crystallization process, using the evaporation crystallization system as claimed in claim 9 to treat desulfurized liquid, characterized in that: The steps include: The evaporation and crystallization equipment evaporates and crystallizes the desulfurized liquid to generate waste liquid; The waste liquid is sent to the waste liquid drying and purification device for drying and purification, wherein the drying unit dries the waste liquid to obtain dry material, and the gas purification device purifies the steam generated by the drying unit drying the waste liquid, and discharges the purified gas.

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