A concentrated mother liquor drying tower and concentrated mother liquor drying and separation system

Abstract

The present invention discloses a concentrated mother liquor drying tower and a concentrated mother liquor drying and separation system, wherein the concentrated mother liquor drying tower includes a tower body, a spray pipe and a multi-stage drying roller; a gas phase outlet is provided at the top of the tower body, and the spray pipe extends into the tower body; the multi-stage drying rollers are arranged below the spray pipe from top to bottom, and the multi-stage drying rollers are mounted on a rotating shaft, and rotating gears are provided at both ends of the rotating shaft, and the two rotating gears are each connected to a rotating motor; a plurality of steel balls are placed in the drying rollers; a microwave generator is provided on the outer surface of the tower body or in an arc-shaped separator pad, and the discharge port at the bottom of the tower body is connected to a discharge rotary valve. The concentrated mother liquor drying tower utilizes the mutual collision between the steel balls built into the drying rollers during the rotation of the drying rollers, so that the solid materials dried on the surface of the steel balls fall off due to the collision, effectively avoiding the formation of scale. In addition, because the specific surface area of ​​the steel balls is large, the contact heat exchange area of ​​the evaporated concentrated mother liquor is significantly increased, so that the processing efficiency and operational flexibility are significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a concentrated mother liquor drying tower and a concentrated mother liquor drying and separation system. Background Art

[0002] Production processes in the chemical, petrochemical, pharmaceutical, metallurgical, nuclear, food, and environmental protection industries generate significant quantities of wastewater, much of which is highly saline. To minimize wastewater volume, MVR evaporation and concentration is often used. During the MVR evaporation process, when impurity concentration reaches a certain level, the solution viscosity increases. To prevent scaling and clogging, the MVR system must regularly discharge this highly concentrated liquid (concentrated mother liquor) to maintain stable operation. Effectively treating this concentrated mother liquor is crucial to achieving zero-emission wastewater treatment. Currently, further concentration and drying are commonly used to treat the concentrated mother liquor. This method offers the advantage of further reducing the volume of the concentrate. The resulting solid powder can be used in the production of construction products or disposed of in landfills.

[0003] At present, the most widely used equipment in the concentrated mother liquor drying industry is the drum scraper dryer. Although this equipment has the advantages of simple structure and simple operation, and can achieve the drying of concentrated mother liquor to a certain extent, it still has the following significant disadvantages: 1. Poor adjustability of the equipment processing load; 2. Low thermal efficiency and processing efficiency; 3. Scaling; 4. Large equipment size leads to high cost and large floor space; 5. Scraper is easy to wear; 6. Equipment sealing is poor and there is a strong odor on site. In response to the above problems, although there are some vacuum concentration and drying equipment systems with low energy consumption, their production process adopts intermittent equipment stirring and drying method, which has the following significant disadvantages: 1. Intermittent production requires many operators and complex operation; 2. It is difficult to determine the end point of concentration and drying, which easily leads to excessive drying time and scaling; 3. The equipment is prone to scaling, which easily leads to reduced heat transfer efficiency and wear of rotating accessories in the equipment; 4. When removing the dried solid material intermittently, the vacuum needs to be broken and re-established continuously, which makes the system complex and difficult to operate. Summary of the Invention

[0004] The present invention aims to provide a concentrated mother liquor drying tower that utilizes the collisions between steel balls built into the drying rollers during their rotation, causing solid materials dried on the surfaces of the steel balls to fall off due to the collisions, effectively preventing scaling. Furthermore, the large surface area of ​​the steel balls significantly increases the contact heat exchange area for the evaporated concentrated mother liquor, significantly improving processing efficiency and operational flexibility.

[0005] In order to solve the above problems, the present invention proposes a concentrated mother liquor drying tower, comprising a tower body, a spray pipe and a multi-stage drying roller; a gas phase outlet is provided on the top of the tower body, and one end of the spray pipe extends into the tower body through the side wall of the tower body; the multi-stage drying rollers are arranged below the spray pipe in sequence from top to bottom, and the multi-stage drying rollers are respectively installed on corresponding rotating shafts, and the two ends of the rotating shaft respectively pass through the tower body and extend outside the tower body, and a rotating gear is provided at each end of the rotating shaft. Each of the rotating gears is connected to a rotating motor; the drying roller is a thin-walled roller with a hollow cavity, a plurality of roller sieve holes are opened on the outer wall of the drying roller, a plurality of steel balls are placed in the cavity of the drying roller, and arc-shaped separation pads are provided between the radial sides of each level of the drying roller and the tower body, and an arc-shaped sealing pad is also provided between the arc-shaped separation pad and the drying roller; a microwave generator is provided on the outer surface of the tower body or in the arc-shaped separation pad, and the discharge port at the bottom of the tower body is connected to a discharge rotary valve.

[0006] Furthermore, the side of the arc-shaped separation pad close to the drying roller is an arc-shaped structure concentric with the drying roller, and the top of the arc-shaped separation pad is a slope structure with a high outside and a low inside; the arc surface sealing pad is arranged at a position close to the lower part of the slope structure of the arc-shaped separation pad.

[0007] Furthermore, an inspection flange is provided at one end of each level of the drying roller, and the inspection flanges between the upper and lower levels of the drying rollers are staggered; end sealing gaskets A and end sealing gaskets B are respectively provided at both axial ends of each level of the drying roller, and both sides of the end sealing gasket A are respectively tightly adjacent to the drying roller and the inner wall of the tower body; one side of the end sealing gasket B is tightly adjacent to the drying roller, and the other side is tightly adjacent to the corresponding inspection flange.

[0008] Furthermore, the discharge rotary valve is connected to the bottom discharge port flange of the tower body through a flange structure; a rotary valve rotating cylinder is arranged in the discharge rotary valve cavity, and the rotary valve rotating cylinder is formed by the staggered arrangement of a rotary valve entity and a rotary valve hopper; a rotary valve arc surface sealing gasket is arranged between the inner wall of the cavity of the discharge rotary valve and the rotary valve rotating cylinder, and rotary valve end sealing gaskets are respectively provided at both ends of the rotary valve rotating cylinder; a rotary valve bearing is provided at the central axis position of the rotary valve rotating cylinder, and one end of the rotary valve bearing is connected to a rotary valve motor.

[0009] Furthermore, an observation mirror belt is provided on the outer wall of the tower body to facilitate operators to observe the state of the concentrated and dried solid particles during equipment debugging; an observation light is provided inside the tower body opposite to the observation mirror belt.

[0010] Furthermore, a liquid disruptor is provided on the spray pipe, and a plurality of spray ports are opened on the spray pipe.

[0011] The present invention also provides another concentrated mother liquor drying tower, comprising a tower body, a spray pipe, multi-stage drying rollers and a hot air pipe; a gas phase outlet is provided on the top of the tower body, one end of the spray pipe extends from the side wall of the tower body into the tower body, and the portion of the spray pipe located in the tower body is provided with a plurality of spray ports; the multi-stage drying rollers are arranged in sequence below the spray pipe from top to bottom, and the multi-stage drying rollers are respectively installed on corresponding rotating shafts, and both ends of the rotating shaft respectively pass through the tower body and extend outside the tower body, and a rotating gear is provided at each end of the rotating shaft. , the two rotating gears are each connected to a rotating motor; the drying roller is a thin-walled roller with a hollow cavity, a plurality of roller sieve holes are provided on the outer wall of the drying roller, a plurality of steel balls are placed in the cavity of the drying roller, and arc-shaped separation pads are provided between the radial sides of each level of the drying roller and the tower body, and an arc-shaped sealing pad is also provided between the arc-shaped separation pad and the drying roller; the discharge port at the bottom of the tower body is connected to a discharge rotary valve; the hot air pipe is arranged below the multi-stage drying roller, and a plurality of hot air outlets with downward openings are provided on the hot air pipe.

[0012] The present invention also provides a concentrated mother liquor drying and separation system, comprising a concentrated mother liquor storage tank, a concentrated mother liquor delivery pump, a concentrated mother liquor drying tower as described above, a heat exchanger, a recovery liquid storage tank, a recovery liquid delivery pump and a vacuum forming system, wherein the concentrated mother liquor storage tank is provided with a first liquid level gauge, the concentrated mother liquor feed pipeline is provided with a first switch valve, the first liquid level gauge is interlocked with the first switch valve for control, the concentrated mother liquor storage tank is connected to the spray pipe at the top of the mother liquor drying tower through the concentrated mother liquor delivery pump, a flow meter and a first regulating valve are provided on the pipeline between the concentrated mother liquor delivery pump and the mother liquor drying tower, the flow meter is interlocked with the first regulating valve for control, and the concentrated mother liquor drying tower is connected to the spray pipe at the top of the mother liquor drying tower through the concentrated mother liquor delivery pump, and a flow meter and a first regulating valve are provided on the pipeline between the concentrated mother liquor delivery pump and the mother liquor drying tower, the flow meter is interlocked with the first regulating valve for control, and the concentrated mother liquor drying tower is connected to the spray pipe at the top of the mother liquor drying tower through the concentrated mother liquor delivery pump. The gas phase outlet is connected to the inlet of the heat exchanger, and a first thermometer interlocked with the microwave generator is provided on the pipeline between the gas phase outlet of the concentrated mother liquor drying tower and the heat exchanger. A cooling circulating water supply pipe and a cooling circulating water return pipe are provided on the heat exchanger. A second regulating valve is provided on the cooling circulating water return pipe. The second regulating valve is interlocked with the second thermometer on the gas phase outlet pipe of the heat exchanger. The gas phase outlet of the heat exchanger is connected to the vacuum forming system, the condensation outlet of the heat exchanger is connected to the inlet of the recovery liquid storage tank, the recovery liquid delivery pump is connected to the outlet of the recovery liquid storage tank, and the recovery liquid storage tank is provided with a liquid level gauge interlocked with the recovery liquid delivery pump.

[0013] Furthermore, the vacuum forming system includes a vacuum circulating water tank, a vacuum circulating pump and a vacuum ejector. The vacuum circulating water tank is connected to the vacuum ejector through the vacuum circulating pump, and the vacuum ejector is respectively connected to the gas phase outlet of the heat exchanger and the vacuum circulating water tank; the exhaust gas outlet of the vacuum circulating water tank is connected to an exhaust gas treatment device, and the exhaust gas treatment device is also connected to an induced draft fan.

[0014] The present invention also provides another concentrated mother liquor drying and separation system, comprising a concentrated mother liquor storage tank, a concentrated mother liquor delivery pump, the above-mentioned concentrated mother liquor drying tower, a heat exchanger, a recovery liquid storage tank, a recovery liquid delivery pump and a burner, wherein the concentrated mother liquor storage tank is provided with a first liquid level gauge, the concentrated mother liquor feed pipeline is provided with a first switch valve, the first liquid level gauge is interlocked with the first switch valve for control, the concentrated mother liquor storage tank is connected to the spray pipe of the concentrated mother liquor drying tower through the concentrated mother liquor delivery pump, a flow meter and a first regulating valve are provided on the pipeline between the concentrated mother liquor delivery pump and the concentrated mother liquor drying tower, the flow meter is interlocked with the first regulating valve for control, the gas phase outlet of the concentrated mother liquor drying tower is connected to the inlet of the heat exchanger, and the gas phase outlet of the concentrated mother liquor drying tower is connected to the inlet of the heat exchanger. A first thermometer interlocked with the regulating valve of the burner fuel inlet pipe and the air inlet pipe is provided on the pipe between them, a cooling circulating water supply pipe and a cooling circulating water return pipe are provided on the heat exchanger, a second regulating valve is provided on the cooling circulating water return pipe, the second regulating valve is interlocked with the second thermometer on the gas phase outlet pipe of the heat exchanger, the gas phase outlet of the heat exchanger is connected to the exhaust gas treatment device, and the exhaust gas treatment device is connected to the induced draft fan; the condensation outlet of the heat exchanger is connected to the inlet of the recovery liquid storage tank, the recovery liquid delivery pump is connected to the outlet of the recovery liquid storage tank, and the recovery liquid storage tank is provided with a liquid level gauge interlocked with the recovery liquid delivery pump; one end of the burner is the fuel inlet, and the other end is connected to the blower, and the heat outlet of the burner is connected to the hot air pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) A concentrated mother liquor drying tower of the present invention comprises a tower body, a spray pipe, a drying roller, an observation mirror belt, a discharge rotary valve, and legs. The multi-stage drying rollers are arranged from top to bottom, and the rotation speed of each drying roller is independently adjusted to obtain a better drying effect. By adjusting the rotational angular velocity of the drying rollers, the surface area of ​​the concentrated liquid in contact with the steel balls for heat exchange and the thickness of the film on the surface of the steel balls can be adjusted, thereby achieving a higher concentration and drying efficiency and load adjustability.

[0017] (2) Arc-shaped separation pads are respectively provided on both sides of the horizontal arc surface of the drying roller, and an arc-shaped sealing pad is provided between each arc-shaped separation pad and the drying roller. A hopper area is formed between the slopes of the two arc-shaped separation pads and the upper arc surface of the drying roller between the two arc-shaped sealing pads to ensure that the material falling from the upper drying roller directly passes through the roller sieve hole of the lower drying roller and falls into the lower drying roller, or falls into the hopper area of ​​the lower drying roller, and in the process of the rotation of the drying roller, the material in the hopper area falls into the lower drying roller. Similarly, arc-shaped separation pads and arc-surface sealing pads are provided so that the steam (high-temperature flue gas) generated during the drying process of the concentrated mother liquor can only pass through the drying rollers from bottom to top and be discharged from the gas phase outlet at the top of the mother liquor drying tower, and cannot pass through the side area without passing through the drying rollers and overflow directly from the bottom to top. This ensures that the temperature of the superheated steam generated during the drying process of the next-level drying roller can be further used by the previous-level drying rollers to dry the concentrated mother liquor, thereby effectively improving thermal efficiency.

[0018] (3) End seals A and B are provided at both ends of the drying roller in the axial direction, and an inspection flange with a hole diameter slightly larger than the diameter of the drying roller is provided on one side of the end of the drying roller. The flange and the flange cover are fixedly connected by a flange. When the drying roller needs to be inspected and repaired, the inspection flange is opened, and the end seal A that is not fixedly connected is first removed from it, and then the drying roller is removed. The inspection flange is provided on one side of the end of each drying roller, so that when one of the drying rollers needs to be inspected and repaired, only the drying roller needs to be removed without affecting other drying rollers, thereby reducing the difficulty of inspection and maintenance.

[0019] (4) The maintenance flanges corresponding to each drying roller are arranged in a staggered and symmetrical manner, so that the multiple drying rollers are arranged compactly.

[0020] (5) The two ends of the discharge rotary valve are flange structures, which are connected to the flange of the discharge port at the bottom of the mother liquid drying tower through the flange. A rotary valve rotating cylinder is set in the discharge rotary valve cavity. The rotary valve rotating cylinder is composed of a rotary valve body and a rotary valve hopper arranged in an alternating manner. A rotary valve arc surface sealing gasket is set between the arc-shaped cavity structure of the discharge rotary valve and the rotary valve rotating cylinder, which plays a role in sealing and isolating gas. Similarly, rotary valve end sealing gaskets are also set at both ends of the rotary valve rotating cylinder. A rotary valve bearing is set at the central axis position of the rotary valve rotating cylinder. One end of the rotary valve bearing is connected to the rotary valve motor. The rotary valve rotating cylinder is driven to rotate slowly by the rotation of the motor. When the rotary valve hopper faces upward, the solid material in the mother liquid drying tower falls into the rotary valve hopper area. As the rotary valve rotating cylinder slowly rotates, when the rotary valve hopper rotates to face downward, the solid material is discharged. During the entire rotation process, the inlet and outlet ends of the discharge rotary valve are always in a closed separation state, which effectively isolates gas.

[0021] (6) The concentrated mother liquor drying and separation system adopts the vacuum stripping method. By forming a vacuum system in the mother liquor drying tower, the boiling point of water corresponding to the vacuum state will be reduced, which will significantly reduce the energy consumption required for the concentration and drying process. In addition, the lowering of the operating temperature can also effectively avoid the formation of scale.

[0022] (7) In the concentrated mother liquor drying and separation system, the heat source required for the concentrated mother liquor drying process adopts microwave heating. A microwave generator is set on the outer surface of the mother liquor drying tower or inside the arc-shaped separation pad cavity, and the drying roller is wrapped therein. The microwave can effectively cause the steel ball to resonate and generate heat, which has the characteristics of simple heating method and fast heating efficiency.

[0023] (8) In this concentrated mother liquor drying and separation system, the heat source required for the concentrated mother liquor drying process is high-temperature flue gas heating. The high-temperature flue gas generated during the combustion process is in countercurrent contact with the concentrated mother liquor to achieve rapid drying of the concentrated mother liquor. The high-temperature flue gas can be generated by conventional burners, or the flue gas generated by equipment such as boilers can be used to recover waste heat. In addition, conventional heating methods such as electric heating, infrared heating, steam heating, and thermal oil can also be coupled.

[0024] (9) A spray pipe is provided at the top of the mother liquor drying tower. After the spray pipe enters the mother liquor drying tower through the main pipe of the concentrated mother liquor delivery pump P01, it can be divided into multiple spray pipe branches, so that the sprayed liquid can be more evenly dispersed onto the upper surface of the drying roller. In addition, a liquid crusher is installed on the spray pipe to make the liquid particles sprayed through the spray pipe small, but not so small that the liquid particles are discharged from the gas phase outlet at the top of the mother liquor drying tower before being dried, affecting the treatment effect.

[0025] (10) An observation mirror is installed at the bottom of the mother liquor drying tower to facilitate the operator to observe the state of the solid particles after concentration and drying during equipment commissioning, so as to make targeted adjustments to the equipment. In order to ensure clear observation, an observation light is installed inside the mother liquor drying tower equipment at a position corresponding to the long observation mirror.

[0026] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a front view structural schematic diagram of a concentrated mother liquor drying tower in the present invention;

[0029] Figure 2 This is a side structural schematic diagram of a concentrated mother liquor drying tower in the present invention;

[0030] Figure 3 Schematic diagram of the front view of the drying roller in the present invention;

[0031] Figure 4 Schematic diagram of the side view of the drying roller in the present invention;

[0032] Figure 5 Schematic diagram of the front view of the rotary valve for discharging materials in the present invention;

[0033] Figure 6 Schematic diagram of the side structure of the discharge rotary valve of the present invention;

[0034] Figure 7 Schematic diagram of the front view of another concentrated mother liquor drying tower in the present invention;

[0035] Figure 8 Schematic diagram of the side structure of another concentrated mother liquor drying tower in the present invention;

[0036] Figure 9 This is a process flow chart of a concentrated mother liquor drying and separation system according to one embodiment of the present invention;

[0037] Figure 10 This is a process flow chart of a concentrated mother liquor drying and separation system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0039] Example 1

[0040] See Figures 1-6 This embodiment provides a concentrated mother liquor drying tower, including a tower body, a spray pipe E01-02, a multi-stage drying roller E01-11, a discharge rotary valve E01-07 and a support leg E01-06; the specific structure is as follows:

[0041] A gas phase outlet E01-01 is located at the top of the tower, and one end of a spray pipe E01-02 extends through the tower's sidewall and into the tower. Multiple drying rollers E01-11 are spaced apart from each other within the tower, located below the spray pipe E01-02. Each drying roller E01-11 is mounted on a corresponding rotating shaft E01-13, each end of which extends through the tower's sidewall and outward. A rotating gear E01-03 is located at each end of the rotating shaft, each connected to a rotating motor E01-04. The rotating motor E01-04 drives the rotating gears E01-03, which in turn rotate the drying rollers. The drying rollers' rotational speed is adjustable. The drying roller E01-11 is a thin-walled, cylindrical roller with a hollow cavity. Several roller mesh holes E01-09 are defined on its outer wall. Within the drying roller cavity, several steel balls E01-14 are placed. These balls occupy between one-quarter and three-quarters of the drying roller's internal volume. The diameter of the steel balls can be adjusted based on the physical properties of the material being processed, maximizing their total surface area while ensuring sufficient impact force during rolling to dislodge any solid material crusted on the surface. Typical steel ball diameters range from 3 to 10 cm. The mesh holes E01-09 are smaller than the diameter of the steel balls to prevent them from falling out during the drying roller's rotation. The diameter of the steel balls typically ranges from 2 to 9 cm.

[0042] Multi-stage (≥1 stage) drying rollers E01-11 are arranged from top to bottom, with the speed of each drying roller independently adjusted to achieve optimal drying results. The concentrated mother liquor is sprayed onto the top of the top drying roller via a spray pipe. The liquid passes through the roller mesh E01-09 and falls onto the surface of the steel balls inside the drying roller. As the steel balls rotate, a thin film of liquid forms on their surfaces. Because the steel balls themselves generate heat under the action of microwaves, the inner surface of the liquid film exchanges heat with the outer surface of the steel balls inside. The outer surface of the liquid film then exchanges heat with the vaporized steam outside, further evaporating the liquid in the concentrated mother liquor. As the top-stage drying rollers rotate, further concentrated liquid from the concentrated mother liquor or partially dried solids fall from top to bottom into the second-stage drying rollers for further concentration and drying. Similar to the first (top) stage, the solid material dried by these multiple drying rollers ultimately falls to the bottom of the concentrated mother liquor drying tower, completing the drying process. In this structural setup, by adjusting the angular velocity of the drying rollers, the surface area of ​​heat exchange between the concentrated liquid and the steel balls, as well as the thickness of the film on the steel balls, can be adjusted, thereby achieving adjustable concentration and drying efficiency and load.

[0043] like Figure 4 To ensure that the concentrated mother liquor flows completely from the drying rollers of the previous stage to the drying rollers of the next stage, and to prevent the liquid material from falling directly to the bottom of the mother liquor drying tower without passing through the multiple drying rollers, resulting in a certain amount of water in the product at the bottom of the mother liquor drying tower due to insufficient drying residence time, arc-shaped separators E01-12 are installed between the drying rollers and the tower body on both radial sides. The side of the arc-shaped separator E01-12 close to the drying roller E01-11 is concentric with the drying roller, and the other side of the arc-shaped separator E01-12 is adapted to the inner wall of the tower body. The top of the arc-shaped separator E01-12 is designed as a sloped structure with a high outer side and a low inner side. An arc-shaped sealing pad E01-17 is provided between the arc-shaped separation pad E01-12 and the drying roller E01-11 and at the lowest position of the slope structure near the arc-shaped separation pad E01-12. Two arc-shaped sealing pads E01-17 are horizontally arranged corresponding to each level of drying roller, so that a hopper area is formed between the slopes of the two arc-shaped separation pads E01-12 and the upper arc surface of the drying roller between the two arc-shaped sealing pads E01-17, ensuring that the material falling from the upper level drying roller either directly passes through the roller sieve hole E01-09 of the next level drying roller and falls into the next level drying roller, or falls into the hopper area of ​​the next level drying roller, and during the rotation of the drying roller, the material in the hopper area falls into the next level drying roller. That is, as the material from the previous drying roller falls down, it may directly pass through the uniform holes and fall into the next drying roller, or it may fall on the surface (hopper area) of the next drying roller. In the case where the material falls onto the surface of the next drying roller, the material that has fallen onto the surface of the drying roller will be scraped off into the uniform holes during the rotation of the drying roller, and then fall into the next drying roller. Similarly, an arc-shaped separator E01-12 and an arc-surface sealing gasket E01-17 are provided so that the steam generated during the drying process of the concentrated mother liquor can only pass through the drying roller from bottom to top and be discharged from the gas phase outlet at the top of the mother liquor drying tower, and cannot pass through the side area without passing through the drying roller and overflow directly from the bottom to top. This ensures that the temperature of the superheated steam generated during the drying process of the next drying roller can be further used by the previous drying roller to dry the concentrated mother liquor, effectively improving thermal efficiency.

[0044] like Figure 3As shown, to facilitate regular inspection and maintenance of the drying roller E01-11, an inspection flange E01-10 with a diameter slightly larger than the drying roller's diameter is installed on one end of the drying roller. End seals AE01-15 and BE01-16 are installed on both ends of the drying roller E01-11's axial direction. End seal BE01-16 is a truncated cone-shaped structure with one end larger than the other. One end of the end seal is tightly attached to one end of the drying roller, and the other end is fixedly connected to the tower body. The shape of end seal AE01-15 is slightly different from that of end seal BE01-16. End seal AE01-15 combines the truncated cone structure of end seal A with a cylindrical structure on one side. One end of the AE01-15 end seal is placed in close proximity to the other end of the drying roller. After installation, the cylindrical structure fits into the flange of the E01-10 inspection flange, facilitating securement of the AE01-15 end seal. While not permanently attached to the tower body, the AE01-15 end seal can be removed through the hole in the E01-10 inspection flange. When the drying roller requires maintenance, the E01-10 inspection flange is opened, and the unattached AE01-15 end seal is first removed, followed by the drying roller. An E01-10 inspection flange is installed at the end of each drying roller, allowing only that drying roller to be removed for maintenance without disturbing the others, thus simplifying maintenance.

[0045] like Figure 5 and Figure 6As shown, in order to reduce the gas overflow in the mother liquor drying tower or the outside air entering the mother liquor drying tower when the solid material is discharged from the bottom after the concentrated mother liquor is dried, a discharge rotary valve E01-07 is provided at the bottom discharge port of the mother liquor drying tower, and a conveyor belt X03 for drying, fixed packaging / external transportation is provided below the discharge rotary valve. Both ends of the discharge rotary valve E01-07 are flanges E01-07-02, which are connected to the flange of the bottom discharge port of the mother liquor drying tower through the flanges. A rotary valve rotating cylinder E01-07-01 is arranged in the cavity of the discharge rotary valve E01-07. The rotary valve rotating cylinder E01-07-01 is composed of a rotary valve entity E01-07-01-1 and a rotary valve hopper E01-07-01-2 arranged in an alternating manner. A rotary valve arc surface sealing gasket E01-07-03 is arranged between the arc-shaped cavity structure of the discharge rotary valve E01-07 and the rotary valve rotating cylinder E01-07-01, which plays the role of sealing and isolating gas; similarly, rotary valve end sealing gaskets E01-07-05 are also provided at both ends of the rotary valve rotating cylinder E01-07-01. A rotary valve bearing E01-07-04 is provided at the central axis position of the rotary valve rotating cylinder. One end of the rotary valve bearing E01-07-04 is connected to the rotary valve motor E01-07-06. The rotary valve motor E01-07-06 rotates to drive the rotary valve rotating cylinder E01-07-01 to rotate slowly. When the rotary valve hopper E01-07-01-2 faces directly upward, the solid material in the concentrated mother liquor drying tower E01 falls into the area of ​​the rotary valve hopper E01-07-01-2. As the rotary valve rotating cylinder E01-07-01 rotates slowly, when the rotary valve hopper E01-07-01-2 rotates to face directly downward, the discharge of the solid material is completed. During the entire rotation process, the inlet and outlet ends of the discharge rotary valve E01-07 are always in a closed and separated state, which effectively isolates the gas.

[0046] In this embodiment, a microwave generator is provided on the outer surface of the tower body or in the arc-shaped separation pad E01-12, and the concentrated mother liquor is dried by microwave heating. The microwave can effectively cause the steel balls to resonate and generate heat, and has the characteristics of simple heating method and high heating efficiency.

[0047] In this embodiment, a long, narrow observation mirror strip E01-05 is installed at the bottom of the concentrated mother liquor drying tower E01. This allows operators to observe the state of the concentrated and dried solid particles during equipment commissioning, allowing for targeted adjustments. For clear observation, an observation light is installed inside the concentrated mother liquor drying tower, corresponding to the observation mirror strip E01-05. Support legs E01-06 are installed at the bottom of the concentrated mother liquor drying tower E01 for support.

[0048] In this embodiment, after the spray pipe E01-02 enters the concentrated mother liquor drying tower E01 after being pumped by the concentrated mother liquor delivery pump P01, it can be divided into multiple spray pipe branches (≥1), facilitating a more even distribution of the sprayed liquid onto the upper surface of the drying rollers. Furthermore, a liquid disruptor can be installed on the spray pipe E01-02 to reduce the size of the liquid particles ejected through the spray pipe, while ensuring that the particles are not so small that fine liquefied particles are discharged from the vapor phase outlet E01-01 at the top of the concentrated mother liquor drying tower E01 before being dried, thereby affecting the treatment effect. The spray pipe is provided with several downward-facing spray ports.

[0049] Example 2

[0050] like Figure 7 and Figure 8 As shown, this example provides another concentrated mother liquor drying tower, comprising a tower body, a spray pipe E01-02, multi-stage drying rollers E01-11, and a hot air pipe E01-08. Unlike Example 1, this embodiment does not employ a microwave heater. Instead, a hot air pipe E01-08 is positioned below the multi-stage drying rollers E01-11 and connected to a burner X04. After entering the mother liquor drying tower, the hot air pipe E01-08 branches into multiple hot air pipes E01-08 (≥1), allowing the hot air in the hot air pipe E01-08 to diffuse more evenly upward to the lower surface area of ​​the drying rollers and then pass through them. To prevent solid particles falling from the final drying roller from clogging the hot air pipe E01-08 opening, the hot air pipe E01-08 is provided with several downward-facing hot air outlets.

[0051] In this embodiment, the steel balls themselves function as heat storage. The high-temperature flue gas generated by burner X04 enters the tower through the hot air duct, heating the steel balls. The inner surface of the liquid film on the steel balls exchanges heat with the outer surface of the steel balls, and the outer surface of the liquid film exchanges heat with the high-temperature flue gas outside, further evaporating the liquid in the concentrated mother liquor. Aside from the heating method, the rest of the mother liquor drying tower in this embodiment is identical to that of the first embodiment, and will not be further described here.

[0052] Example 3

[0053] like Figure 9 As shown, this embodiment provides a concentrated mother liquor drying and separation system, including a concentrated mother liquor storage tank V001, a concentrated mother liquor delivery pump P01, a concentrated mother liquor drying tower E01, a heat exchanger E02, a recovered liquid storage tank V002, a recovered liquid delivery pump P02, and a vacuum forming system. The concentrated mother liquor drying tower E01 adopts the mother liquor drying tower in the above-mentioned embodiment 1. Specifically:

[0054] The concentrated mother liquor is transported to the concentrated mother liquor storage tank V001 through a pipeline for temporary storage. The concentrated mother liquor storage tank V001 is provided with a first liquid level gauge LIAS-001, and the concentrated mother liquor feeding pipeline is provided with a first switch valve V01. The first liquid level gauge LIAS-001 is interlocked with the first switch valve V01; when the liquid level is low, the first switch valve V01 is automatically opened to feed, and when the liquid level reaches the specified liquid level, the first switch valve V01 is automatically closed to stop feeding. The concentrated mother liquor in the concentrated mother liquor storage tank V001 is pressurized by the concentrated mother liquor transfer pump P01 and then transferred to the spray pipe E01-02 located at the top of the mother liquor drying tower. The downstream pipeline of the concentrated mother liquor transfer pump P01 is equipped with a flow meter FIAS-001 and a first regulating valve V06. The flow meter FIAS-001 and the first regulating valve V06 are interlocked. When the flow rate is excessive, the interlock adjusts to reduce the opening of the first regulating valve V06. When the flow rate is too low, the interlock adjusts to increase the opening of the first regulating valve V06. This ensures a constant flow rate entering the spray pipe E01-02, ensuring stable operation of the entire system. After being refined and broken down in the spray pipe E01-02, the concentrated mother liquor particles fall from top to bottom onto the drying roller E01-11.

[0055] During the rotation process, the drying roller E01-11 will drive the built-in steel ball E01-14 to rotate synchronously. The concentrated mother liquor falling into the drying roller E01-11 will be quickly dispersed on the surface of the steel ball E01-14 to form a liquid film. The thickness of the liquid film and the surface area of ​​the liquid film dispersed on the surface of the steel ball are affected by the angular velocity of the drying roller E01-11. The faster the angular velocity of the rotation, the thinner the liquid film formed on the surface of the steel ball E01-14, the larger the heat transfer area of ​​the film formed on the surface of the steel ball, and the better the concentrated mother liquor drying effect, which makes the drying roller E01-11 have the characteristic of load adjustability.

[0056] After the concentrated mother liquor passes through the first-stage drying roller E01-11 at the top of the mother liquor drying tower, some of the water in the concentrated mother liquor evaporates, increasing its concentration. Under the influence of gravity, the concentrated mother liquor descends from top to bottom to the second-stage drying roller for further concentration and drying. After passing through multiple stages of drying rollers E01-11, the concentrated mother liquor is gradually dried, and solid particles fall to the solids storage area at the bottom of the mother liquor drying tower E01. As drying roller E01-11 rotates, the thin film of liquid dispersed on the surface of steel balls E01-14 is dried, forming a crust on the surface of the steel balls. As drying roller E01-11 rotates, the internal steel balls E01-14 collide with each other, causing the crusted solids to fall off the steel balls, making the drying rollers less prone to scaling. The dried solid material is less likely to adhere to subsequent steel balls E01-14 and instead falls relatively quickly through drying rollers E01-11 to the solids storage area at the bottom of mother liquor drying tower E01. The size of the steel balls E01-14 in each stage of drying rollers E01-11 is adjusted according to the characteristics of the material, and the size of the steel balls in the drying rollers also varies from the first to the last stage, normally increasing gradually.

[0057] The heat source required in the process of concentrated mother liquor being gradually evaporated and concentrated from top to bottom into solid particles mainly includes two parts: (1) Microwaves are generated by a microwave generator YIS-001 set on the outer surface of the mother liquor drying tower or built into the arc-shaped separator E01-12. Because the steel ball itself generates heat under the action of microwaves, it can heat the liquid film attached to the surface of the steel ball E01-14 from the inside out. Because the steel ball itself has a certain heat storage capacity, it will not be significantly cooled due to the vaporization of the liquid on the surface of the steel ball E01-14. The temperature system in the entire concentrated mother liquor drying tower E01 is relatively stable and has strong anti-fluctuation properties, thereby making the entire process system stable. The first thermometer TIAS-001 on the gas phase outlet pipe at the top of the concentrated mother liquor drying tower E01 is interlocked with the microwave generator YIS-001 to ensure the temperature stability in the mother liquor drying tower E01 system. (2) The superheated steam generated by the evaporation of the concentrated mother liquid in the next-stage drying roller E01-11 flows from bottom to top into the previous-stage drying roller E01-11, thereby providing heat for the drying of the liquid film on the surface of the steel ball E01-14 in the previous-stage drying roller, realizing the reuse of steam energy and improving thermal efficiency. Because the liquid film on the surface of the steel ball E01-14 is heated simultaneously on the inner and outer surfaces, the heat transfer surface area is doubled, which significantly improves its heat transfer efficiency, thereby making it have the characteristic of high processing efficiency. Of course, in addition to this, electric heating, infrared heating, steam heating, thermal oil and other heating methods can also be used to achieve the same purpose of the invention.

[0058] During the concentration and drying process of the concentrated mother liquor drying tower, the concentrated mother liquor (or partially dried solid particles) flows unidirectionally from top to bottom and completely and gradually passes through the multi-stage drying rollers E01-11; the superheated steam after the concentrated mother liquor evaporates flows unidirectionally from bottom to top and completely and gradually passes through the multi-stage drying rollers E01-11, so that the heated medium (concentrated mother liquor) and the heating medium (superheated steam) can obtain sufficient heat exchange in the multi-stage drying rollers E01-11, and will not flow directly from bottom to top or from top to bottom from other locations without passing through the drying rollers E01-11.

[0059] During the drying process of the concentrated mother liquor, in order to effectively evaporate the water in the concentrated mother liquor, the heating temperature is often controlled at above 100°C, or even higher. The energy consumption required for the concentration and drying process is high. To reduce energy consumption, the concentrated mother liquor drying and separation system of this embodiment adopts a vacuum stripping method. By forming a vacuum system in the concentrated mother liquor drying tower, the boiling point of water corresponding to the vacuum state is reduced, which in turn significantly reduces the energy consumption required for the concentration and drying process. In addition, the reduced operating temperature can also effectively prevent the formation of scale. The vacuum formation system includes a vacuum circulating water tank V003, a vacuum circulating pump P03, and a vacuum ejector X01. The vacuum circulating water in the vacuum circulating water tank V003 is pressurized by the vacuum circulating pump P03 and then transported to the vacuum ejector X01. Due to the high pressure and fast flow rate, a vacuum is generated when the water flows out of the vacuum ejector X01 rapidly, thereby sucking the gas in the gas phase outlet pipe at the top of the heat exchanger E02 into the vacuum ejector X01, forming a vacuum system in the concentrated mother liquor drying and separation system. The gas-liquid mixture is discharged from the bottom pipe of the vacuum ejector X01 and separated in the vacuum circulating water tank V003. The liquid phase is recycled, while the gas phase is discharged through the second valve V17 to the exhaust gas treatment unit X02 for treatment and emission standards. To prevent the vacuum circulating water temperature from rising during the vacuum pumping process, which could affect the vacuum pumping effect, a coil is installed on the outer wall of the vacuum circulating water tank V003. The coil is filled with cooling circulating water. When the third thermometer TISA-003 on the vacuum circulating water tank V003 exceeds a high temperature, the second on-off valve V15 is interlocked to open to reduce the temperature. When the temperature drops to a specified level, the second on-off valve V15 is interlocked to close. In addition, a primary water line is installed on the vacuum circulating water tank V003. When the liquid level on the third level gauge LIAS-003 on the vacuum circulating water tank V003 drops to a specified level, the third on-off valve V18 on the feed primary water line is interlocked to open to replenish water lost during the vacuum circulation process. When the liquid level of the third liquid level gauge LIAS-003 on the vacuum circulating water tank V003 rises to the specified position, the third switch valve V18 on the feed primary water pipeline is chained and closed.

[0060] Steam generated by vacuum stripping and evaporation from the top gas phase outlet E01-01 of the concentrated mother liquor drying tower E01 enters the gas phase inlet of the heat exchanger E02 through a pipeline, and then passes from bottom to top through the vertically placed shell and tube heat exchanger E02. The heat exchanger E02 is equipped with a cooling circulating water supply pipe and a cooling circulating water return pipe to cool the heat exchanger E02. The cooling circulating water return pipe is equipped with a second regulating valve V10. This valve is interlocked with the second thermometer TIAS-002 on the gas phase outlet pipe of the heat exchanger E02. When the temperature is high, the opening of the second regulating valve V10 is increased, and when the temperature is low, the opening of the second regulating valve V10 is decreased to ensure the stability of the temperature system and ensure that the steam entering the heat exchanger E02 can be completely condensed. After condensation, the recovered liquid, which has transformed from a gaseous state to a liquid state, flows by gravity into the recovered liquid storage tank V002 for temporary storage. A second level gauge, LIAS-002, is installed on the recovered liquid storage tank V002, interlocking with the recovered liquid delivery pump P02. When the liquid level reaches a specified height, the interlock automatically activates the recovered liquid delivery pump P02, delivering the recovered liquid to the downstream process. The first valve V11 at the top of the recovered liquid storage tank V002 is always open. To prevent outside air from entering the vacuum system through the pipe flowing to the recovered liquid storage tank V002 and disrupting the vacuum within the system, the discharge pipe at the bottom of the heat exchanger E02 must be inserted below the liquid level in the recovered liquid storage tank V002. Furthermore, to ensure that the recovered liquid condensed in the heat exchanger E02 flows by gravity into the recovered liquid storage tank V002, the heat exchanger E02 has a required installation height. The clear height between the bottom outlet of the heat exchanger E02 and the liquid level in the recovered liquid storage tank V002 must be greater than the water column height corresponding to the vacuum level in the mother liquor drying and separation system. PG-001, PG-002, and PG-003 represent conventional pressure gauges behind the pumps, which are used to indicate the pressure behind the concentrated mother liquor delivery pump P01, the recovered liquid delivery pump P02, and the vacuum circulation pump P03, respectively; V05, V09, and V13 are check valves, which are also conventional configurations to prevent the material in the pipeline from backflowing and damaging the pump blades when the pump stops.

[0061] The tail gas discharge pipe at the top of the heat exchanger E02 is connected to the air inlet of the vacuum ejector X01. The non-condensable gas discharged from the top of the heat exchanger E02 is discharged into the vacuum circulating water tank V003 through the vacuum suction action of the vacuum ejector X01. The tail gas in the vacuum circulating water tank V003 is discharged to the tail gas treatment device X02 through the tail gas pipe at the top. The tail gas that meets the standards after treatment is discharged by the induced draft fan P04, realizing the complete operation of the entire system.

[0062] Example 4

[0063] like Figure 10FIG. 1 shows another concentrated mother liquor drying and separation system according to the present invention, comprising a concentrated mother liquor storage tank V001, a concentrated mother liquor delivery pump P01, a concentrated mother liquor drying tower E01, a heat exchanger E02, a recovered liquid storage tank V002, a recovered liquid delivery pump P02, and a burner X04. Unlike the aforementioned embodiment 3, the concentrated mother liquor drying tower E01 in this embodiment utilizes the mother liquor drying tower of embodiment 2. A hot air duct E01-08 is provided at the bottom of the tower. One end of the burner X04 serves as a fuel inlet, and the other end is connected to a blower P05. The heat outlet of the burner X04 is connected to the hot air duct E01-08. With the assistance of the blower P05, the high-temperature flue gas generated by the combustion of the fuel in the burner X04 passes through the hot air duct E01-08 and enters the concentrated mother liquor drying tower E01. A third regulating valve V07 is installed on the fuel inlet pipe of burner X04. This valve is interlocked with the first thermometer TIAS-001 on the gas phase outlet pipe at the top of the concentrated mother liquor drying tower E01 and the fourth thermometer TIAS-004 on the hot air pipe. A fourth regulating valve V08 is installed on the pipe connecting burner X04 to blower P05. This valve is also interlocked with the fourth thermometer TIAS-004 on the hot air pipe. The concentrated mother liquor drying and separation system of this embodiment uses high-temperature flue gas heating as the heat source for the concentrated mother liquor drying process. The high-temperature flue gas generated during the combustion process comes into countercurrent contact with the concentrated mother liquor, achieving rapid drying of the concentrated mother liquor. The high-temperature flue gas can be generated by conventional burners or by utilizing waste heat recovery from flue gas generated by equipment such as boilers. Conventional heating methods such as electric heating, infrared heating, steam heating, and thermal oil heating can also be used. While Example 3 utilizes vacuum distillation technology, this embodiment does not utilize this technology. In addition, the other structures of the concentrated mother liquor drying and separation system of this embodiment are the same as those of Example 3, and are not described in detail here.

[0064] The effective operation of the concentrated mother liquor drying and separation system of the present invention solves the problems faced by traditional drum scraper dryers during the production process, such as poor adjustability of the equipment processing load, low thermal efficiency and processing efficiency, easy scaling, high cost due to large equipment volume, large floor space, easy wear of the scraper, poor equipment sealing, and strong on-site odor. By coupling together a variety of innovative technologies, a concentrated mother liquor drying and separation system is disclosed. The separation system has the advantages of strong adjustability of the equipment processing load, high processing efficiency, low energy consumption, low scaling, small equipment volume, good equipment sealing, continuous production, and fully automated production. It has broad market application prospects.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A concentrated mother liquor drying tower, characterized in that: The cam is provided with a plurality of rollers, and the rollers are connected to the cam body by a plurality of rollers, and the rollers are connected to the cam body by a plurality of rollers.

2. The concentrated mother liquor drying tower according to claim 1, characterized in that: The side of the arc-shaped separation pad close to the drying roller is an arc-shaped structure concentric with the drying roller, and the top of the arc-shaped separation pad is a slope structure; the arc surface sealing pad is arranged at the lowest position close to the slope structure of the arc-shaped separation pad.

3. The concentrated mother liquor drying tower according to claim 1, characterized in that: An inspection flange is provided at one end of the drying roller of each level, and the inspection flanges between the upper and lower drying rollers are staggered; end sealing gaskets A and end sealing gaskets B are respectively provided at the axial ends of the drying roller of each level, and the two sides of the end sealing gasket A are respectively tightly adjacent to the drying roller and the inner wall of the tower body; one side of the end sealing gasket B is tightly adjacent to the drying roller, and the other side is tightly adjacent to the corresponding inspection flange.

4. The concentrated mother liquor drying tower according to claim 1, characterized in that: The discharge rotary valve is connected to the bottom discharge port flange of the tower body through a flange structure; a rotary valve rotating cylinder is arranged in the discharge rotary valve cavity, and the rotary valve rotating cylinder is formed by the staggered arrangement of a rotary valve entity and a rotary valve hopper; a rotary valve arc surface sealing gasket is arranged between the inner wall of the cavity of the discharge rotary valve and the rotary valve rotating cylinder, and rotary valve end sealing gaskets are respectively provided at both ends of the rotary valve rotating cylinder; a rotary valve bearing is provided at the central axis position of the rotary valve rotating cylinder, and one end of the rotary valve bearing is connected to a rotary valve motor.

5. The concentrated mother liquor drying tower according to claim 1, characterized in that: An observation mirror belt is provided on the outer wall of the tower body to facilitate operators to observe the state of the concentrated and dried solid particles during equipment debugging; an observation light is provided in the tower body opposite to the observation mirror belt.

6. The concentrated mother liquor drying tower according to claim 1, characterized in that: The spray pipe is provided with a liquid breaker, and a plurality of spray ports are opened on the spray pipe.

7. A concentrated mother liquor drying tower, characterized in that: It includes a tower body, a spray pipe, a multi-stage drying roller and a hot air pipe; a gas phase outlet is provided on the top of the tower body, one end of the spray pipe extends into the tower body from the side wall of the tower body, and the part of the spray pipe located in the tower body is provided with a plurality of spray ports; the multi-stage drying rollers are arranged below the spray pipe in sequence from top to bottom, and the multi-stage drying rollers are respectively installed on corresponding rotating shafts, and the two ends of the rotating shaft respectively pass through the tower body and extend outside the tower body, and a rotating gear is provided at each end of the rotating shaft, and the two rotating gears are each The transmission is connected to a rotating motor; the drying roller is a thin-walled roller with a hollow cavity, a plurality of roller sieve holes are provided on the outer wall of the drying roller, a plurality of steel balls are placed in the cavity of the drying roller, arc-shaped separation pads are provided between the radial sides of each stage of the drying roller and the tower body, and an arc-shaped sealing pad is also provided between the arc-shaped separation pad and the drying roller; the discharge port at the bottom of the tower body is connected to a discharge rotary valve; the hot air pipe is arranged below the multi-stage drying roller, and a plurality of hot air outlets with downward openings are provided on the hot air pipe.

8. A concentrated mother liquor drying and separation system, characterized in that: The invention comprises a concentrated mother liquor storage tank, a concentrated mother liquor delivery pump, a concentrated mother liquor drying tower according to any one of claims 1 to 6, a heat exchanger, a recovered liquid storage tank, a recovered liquid delivery pump and a vacuum forming system, wherein the concentrated mother liquor storage tank is provided with a first liquid level gauge, the concentrated mother liquor feed pipeline is provided with a first switch valve, the first liquid level gauge is interlocked with the first switch valve for control, the concentrated mother liquor storage tank is connected to the spray pipe at the top of the mother liquor drying tower through the concentrated mother liquor delivery pump, a flow meter and a first regulating valve are provided on the pipeline between the concentrated mother liquor delivery pump and the mother liquor drying tower, the flow meter is interlocked with the first regulating valve for control, the gas phase outlet of the concentrated mother liquor drying tower is connected to the gas phase outlet of the concentrated mother liquor drying tower. The inlet of the heat exchanger is connected, and a first thermometer interlocked with a microwave generator is provided on the pipeline between the gas phase outlet of the concentrated mother liquor drying tower and the heat exchanger. A cooling circulating water upstream pipe and a cooling circulating water return pipe are provided on the heat exchanger. A second regulating valve is provided on the cooling circulating water return pipe. The second regulating valve is interlocked with the second thermometer on the gas phase outlet pipe of the heat exchanger. The gas phase outlet of the heat exchanger is connected to the vacuum forming system. The condensation outlet of the heat exchanger is connected to the inlet of the recovery liquid storage tank. The recovery liquid delivery pump is connected to the outlet of the recovery liquid storage tank. The recovery liquid storage tank is provided with a second liquid level gauge interlocked with the recovery liquid delivery pump.

9. The concentrated mother liquor drying and separation system according to claim 8, characterized in that: The vacuum forming system includes a vacuum circulating water tank, a vacuum circulating pump and a vacuum ejector. The vacuum circulating water tank is connected to the vacuum ejector through the vacuum circulating pump. The vacuum ejector is respectively connected to the gas phase outlet of the heat exchanger and the vacuum circulating water tank. The exhaust gas outlet of the vacuum circulating water tank is connected to an exhaust gas treatment device, and an induced draft fan is also connected to the exhaust gas treatment device.

10. A concentrated mother liquor drying and separation system, characterized in that: The invention comprises a concentrated mother liquor storage tank, a concentrated mother liquor delivery pump, a concentrated mother liquor drying tower as claimed in claim 7, a heat exchanger, a recovery liquid storage tank, a recovery liquid delivery pump and a burner, wherein the concentrated mother liquor storage tank is provided with a first liquid level gauge, the concentrated mother liquor feed pipeline is provided with a first switch valve, the first liquid level gauge is interlocked with the first switch valve for control, the concentrated mother liquor storage tank is connected to the spray pipe of the concentrated mother liquor drying tower through the concentrated mother liquor delivery pump, a flow meter and a first regulating valve are provided on the pipeline between the concentrated mother liquor delivery pump and the concentrated mother liquor drying tower, the flow meter is interlocked with the first regulating valve for control, the gas phase outlet of the concentrated mother liquor drying tower is connected to the inlet of the heat exchanger, and a gas phase outlet of the concentrated mother liquor drying tower is provided on the pipeline between the gas phase outlet of the concentrated mother liquor drying tower and the heat exchanger. There is a first thermometer interlocked with the regulating valves of the burner fuel inlet pipe and the air inlet pipe, the heat exchanger is provided with a cooling circulating water upper water pipe and a cooling circulating water return pipe, the cooling circulating water return pipe is provided with a second regulating valve, the second regulating valve is interlocked with the second thermometer on the gas phase outlet pipe of the heat exchanger, the gas phase outlet of the heat exchanger is connected to the exhaust gas treatment device, and the exhaust gas treatment device is connected to the induced draft fan; the condensation outlet of the heat exchanger is connected to the inlet of the recovery liquid storage tank, the recovery liquid delivery pump is connected to the outlet of the recovery liquid storage tank, and the recovery liquid storage tank is provided with a second liquid level gauge interlocked with the recovery liquid delivery pump; one end of the burner is the fuel inlet, and the other end is connected to the blower, and the heat outlet of the burner is connected to the hot air pipe.

Images