Liquid level control evaporation system

Abstract

The liquid level control evaporation system comprises an evaporation tank, the top of the evaporation tank is connected with a feeding pipe, the feeding pipe is connected with a feeding pump, the feeding pump is electrically connected with a controller, and the top of the evaporation tank is provided with a liquid level sensing mechanism; wherein the liquid level sensing mechanism comprises at least three supporting rods which are connected to the top in the evaporation tank and are distributed in an annular array, the bottoms of the supporting rods are connected with a supporting plate, the supporting plate is provided with a buoyancy ball, the buoyancy ball is located between the supporting rods, the supporting rods are movably sleeved with a movable plate located above the buoyancy ball, and the movable plate is used for making contact with the buoyancy ball; a feeler lever is connected to the top of the movable plate and movably penetrates through the top of the evaporation tank, a support is arranged at the top of the evaporation tank, a trigger switch located over the feeler lever is arranged at the bottom in the support, the trigger switch is used for making contact with the feeler lever, and the trigger switch is electrically connected with the controller.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a liquid level control evaporation system. Background Technology

[0002] Sodium sulfate, chemically known as Glauber's salt, is a colorless crystal or powder with hygroscopic properties. Its solubility in water increases with increasing temperature, and it is neutral or slightly alkaline. Sodium sulfate exists in various forms, such as anhydrous sodium sulfate and sodium sulfate decahydrate, with sodium sulfate decahydrate commonly known as mirabilite.

[0003] In the production process of sodium sulfate, the water of crystallization in sodium sulfate needs to be evaporated by evaporation equipment. In order to strictly control the process parameters such as temperature and pressure during evaporation, it is necessary to accurately control the amount of sodium sulfate evaporated each time. Existing evaporation equipment uses a liquid level sensor to control the amount of sodium sulfate introduced. However, under high temperature and high pressure conditions, the liquid level sensor is prone to electronic failure, which leads to the failure of the control function and ultimately renders it unusable. Utility Model Content

[0004] The main purpose of this application is to provide a liquid level control evaporation system, which aims to solve the technical problem that the liquid level control function of existing sodium sulfate evaporation equipment is prone to failure.

[0005] To achieve the above objectives, this application provides a liquid level control evaporation system, including an evaporator. A feed pipe is connected to the top of the evaporator, and a feed pump is connected to the feed pipe. The feed pump is electrically connected to a controller. A liquid level sensing mechanism is provided on the top of the evaporator. The liquid level sensing mechanism includes at least three support rods connected to the top of the evaporator and arranged in a circular array. A support plate is connected to the bottom of each support rod, and a buoyancy ball is provided on the support plate, located between the support rods. A movable plate is movably sleeved on each support rod above the buoyancy ball, and the movable plate is used to contact the buoyancy ball. A touch rod is connected to the top of the movable plate, and the touch rod movably penetrates the top of the evaporator. A bracket is provided on the top of the evaporator, and a trigger switch is provided at the bottom of the bracket, located directly above the touch rod, and the trigger switch is used to contact the touch rod. The trigger switch is electrically connected to the controller.

[0006] Optionally, a limiting plate is fixedly sleeved on the contact rod, and the limiting plate is attached to the top of the evaporator to create a gap between the movable plate and the buoyancy ball.

[0007] Optionally, a spiral evaporator is provided inside the evaporator, with a first exhaust pipe extending out of the evaporator connected to the bottom of the spiral evaporator and an air inlet pipe connected to the top of the spiral evaporator, extending out of the top of the evaporator.

[0008] Optionally, a three-way solenoid valve is connected between the top of the spiral evaporator tube and the air inlet pipe. The three-way solenoid valve is connected to an air outlet pipe, which is higher than the upper limit liquid level. A pressure sensor is installed at the top of the evaporator. Both the pressure sensor and the three-way solenoid valve are electrically connected to the controller. The upper limit liquid level is the upper limit position of the buoyancy ball.

[0009] Optionally, a vibrator is provided on the outer wall of the evaporator, and the vibrator is connected to a vibration transmission block located inside the evaporator. The vibration transmission block is connected to a vibration frame that contacts the spiral evaporator tube.

[0010] Optionally, the vibration frame includes a vertical plate connected to the vibration transmission block, and a plurality of contact frames arranged from top to bottom are connected to the side of the vertical plate near the spiral evaporator tube. The contact frames are used to contact the spiral evaporator tube.

[0011] Optionally, a first solenoid valve is provided at the bottom of the evaporator, and a discharge pipe is connected to the bottom of the first solenoid valve.

[0012] Optionally, it also includes a temporary storage tank for temporarily storing sodium sulfate solution, with multiple evaporators, each of which is connected to the temporary storage tank via a corresponding feed pump.

[0013] Optionally, a spiral preheating pipe is provided inside the temporary storage tank. The top of the spiral preheating pipe is connected to a second exhaust pipe that extends out of the temporary storage tank, and the bottom of the spiral preheating pipe is connected to a gas collecting cylinder. The first exhaust pipe in each evaporator extends into the temporary storage tank and is connected to the gas collecting cylinder.

[0014] Optionally, a second solenoid valve is connected between the first exhaust pipe and the air manifold.

[0015] The beneficial effects that this application can achieve are as follows:

[0016] Based on the liquid level sensing mechanism described in this application, when sodium sulfate solution is added to the evaporator through the feed pump and feed pipe, the sodium sulfate solution reaches a certain level, which generates buoyancy on the buoyancy ball, causing it to float. Multiple support rods guide the buoyancy ball, allowing it to move only up and down. When the buoyancy ball reaches the corresponding position, it pushes the movable plate and contact rod upwards until the top of the contact rod contacts the trigger switch. The trigger switch sends an electrical signal to the controller, which then stops the feed pump, thus stopping the addition of sodium sulfate solution to the evaporator and achieving automatic liquid level control. Since the trigger switch, as a sensor, is located outside the evaporator, and the interior of the evaporator only contains mechanical moving parts such as the buoyancy ball, movable plate, and contact rod, without any electronic components, it is unaffected by the high temperature and high pressure environment inside the evaporator, thus enabling it to maintain liquid level control for an extended period. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of a liquid level controlled evaporation system according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the liquid level sensing mechanism in an embodiment of this application;

[0020] Figure 3 This is a partial cross-sectional view (top view) of the connection between multiple first exhaust pipes and the gas manifold in an embodiment of this application.

[0021] Figure label:

[0022] 110-Evaporator, 120-Feed pipe, 130-Feed pump, 140-Controller, 150-Liquid level sensing mechanism, 151-Support rod, 152-Panel, 153-Buoyancy ball, 154-Moving plate, 155-Touch rod, 156-Bracket, 157-Trigger switch, 158-Limit plate, 160-Spiral evaporator tube, 170-First exhaust pipe, 180-Air inlet pipe, 190-Three-way solenoid valve, 210-Air outlet pipe, 220-Air pressure sensor, 230-Vibrator, 240-Vibration transmission block, 250-Vibration frame, 251-Vertical plate, 252-Contact frame, 260-First solenoid valve, 270-Discharge pipe, 280-Temporary storage tank, 290-Spiral preheating pipe, 310-Second exhaust pipe, 320-Air collection cylinder, 330-Second solenoid valve.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0028] Example

[0029] Reference Figures 1-3 This embodiment provides a liquid level controlled evaporation system, including an evaporator 110. A feed pipe 120 is connected to the top of the evaporator 110, and a feed pump 130 is connected to the feed pipe 120. The feed pump 130 is electrically connected to a controller 140. A liquid level sensing mechanism 150 is provided on the top of the evaporator 110. The liquid level sensing mechanism 150 includes at least three support rods 151 connected to the top of the evaporator 110 and arranged in a circular array. A support plate 152 is connected to the bottom of each support rod 151, and a buoyancy ball 153 is provided on the support plate 152. 153 is located between support rods 151. A movable plate 154 is movably sleeved on support rod 151 above the buoyancy ball 153. The movable plate 154 is used to contact the buoyancy ball 153. A touch rod 155 is connected to the top of the movable plate 154. The touch rod 155 moves through the top of the evaporator 110. A bracket 156 is provided on the top of the evaporator 110. A trigger switch 157 is provided at the bottom of the bracket 156, located directly above the touch rod 155. The trigger switch 157 is used to contact the touch rod 155. The trigger switch 157 is electrically connected to the controller 140.

[0030] In this embodiment, when sodium sulfate solution is added to the evaporator 110 through the feed pump 130 and feed pipe 120, the sodium sulfate solution reaches a certain level, which can generate buoyancy on the buoyancy ball 153, causing it to float. Multiple support rods 151 guide the buoyancy ball 153, allowing it to move only up and down. When the buoyancy ball 153 floats to the corresponding position, it can push the movable plate 154 and the contact rod 155 upwards as a whole until the top of the contact rod 155 contacts the trigger switch 157. The trigger switch 157 then sends a signal to the controller 140. When an electrical signal is sent, the controller 140 can control the feed pump 130 to stop running, that is, stop adding sodium sulfate solution into the evaporator 110, thereby realizing the automatic liquid level control function. Since the trigger switch 157 is set outside the evaporator 110 as a sensor, the inside of the evaporator 110 only contains mechanical moving parts such as the buoyancy ball 153, the movable plate 154, and the contact rod 155, and there are no electronic parts. Therefore, it is not affected by the high temperature and high pressure environment inside the evaporator 110, thus enabling it to maintain the liquid level control function for a long time.

[0031] It should be noted that the movable plate 154 and the contact rod 155 should be made of lightweight materials (such as aluminum alloy) to reduce the consumption of buoyancy and allow the buoyancy ball 153 to float effectively. The controller 140 can be an S7-200 PLC controller to meet the usage requirements.

[0032] As an optional implementation, a limiting plate 158 is fixedly sleeved on the contact rod 155, and the limiting plate 158 is attached to the top of the evaporator 110 so that there is a gap between the movable plate 154 and the buoyancy ball 153.

[0033] In this embodiment, under normal circumstances (i.e., when not in use or when the liquid level drops), the buoyancy ball 153 is placed statically on the support plate 152. Under the action of the limiting plate 158, the movable plate 154 is suspended above the buoyancy ball 153, thereby preventing the movable plate 154 from squeezing the buoyancy ball 153 for a long time and causing it to deform, thus ensuring the service life of the buoyancy ball 153.

[0034] As an optional implementation, a spiral evaporation tube 160 is provided inside the evaporator 110. The bottom of the spiral evaporation tube 160 is connected to a first exhaust pipe 170 extending out of the evaporator 110, and the top of the spiral evaporation tube 160 is connected to an air inlet pipe 180 extending out of the top of the evaporator 110.

[0035] In this embodiment, high-temperature gas can be continuously introduced into the spiral evaporator tube 160 through the air inlet pipe 180, thereby causing the sodium sulfate solution to evaporate at high temperature. The gas after heat exchange is discharged from the first exhaust pipe 170. Based on the spiral structure of the spiral evaporator tube 160, its contact area with the sodium sulfate solution can be increased, thereby improving the evaporation efficiency and effect.

[0036] As an optional implementation, a three-way solenoid valve 190 is connected between the top of the spiral evaporator tube 160 and the air inlet pipe 180. The three-way solenoid valve 190 is connected to an air outlet pipe 210, which is higher than the upper limit liquid level. A pressure sensor 220 is installed on the top of the evaporator tank 110. Both the pressure sensor 220 and the three-way solenoid valve 190 are electrically connected to the controller 140. The upper limit liquid level is the upper limit position of the buoyancy ball 153.

[0037] In this embodiment, high-temperature gas is introduced through the inlet pipe 180. The high-temperature gas can simultaneously enter the spiral evaporator 160 and the outlet pipe 210 through the three-way solenoid valve 190, so that a portion of the high-temperature gas fills the remaining space above the liquid surface in the evaporator 110, thereby forming a high-temperature and high-pressure environment, which further promotes the evaporation efficiency of the sodium sulfate solution. When the pressure sensor 220 detects that a certain pressure has been reached, it can send a signal to the controller 140, which can control the three-way solenoid valve 190 to close the outlet pipe 210, so that the high-temperature gas only enters the spiral evaporator 160. When the liquid level drops to a certain level after evaporation and the internal gas pressure drops to a preset critical value, the outlet pipe 210 can be automatically opened again through the three-way solenoid valve 190 to pressurize the gas. This process is repeated until the evaporation process is completed. No manual management is required, the degree of automation is high, and the evaporation efficiency is high.

[0038] As an optional implementation, an exciter 230 is provided on the outer wall of the evaporator 110. The exciter 230 is connected to a vibration transmission block 240 located inside the evaporator 110. The vibration transmission block 240 is connected to a vibration frame 250 that contacts the spiral evaporator tube 160. The vibration frame 250 includes a vertical plate 251 connected to the vibration transmission block 240. A plurality of contact frames 252 arranged from top to bottom are connected to the side of the vertical plate 251 near the spiral evaporator tube 160. The contact frames 252 are used to contact the spiral evaporator tube 160.

[0039] In this embodiment, after sodium sulfate crystallizes, some crystals adhere to the spiral evaporator tube 160. At this time, the vibrator 230 can be activated, and the vibration transmission block 240 transmits the vibration, thereby causing the internal vibration frame 250 to vibrate at a certain frequency. Each contact frame 252 in the vibration frame 250 can vibrate at different gap positions of the spiral evaporator tube 160, thereby vibrating the crystals on the spiral evaporator tube 160 off for subsequent recycling.

[0040] As an optional implementation, the bottom of the evaporator 110 is provided with a first solenoid valve 260, and the bottom of the first solenoid valve 260 is connected to a discharge pipe 270. When recovering crystals, the first solenoid valve 260 is opened so that the crystals can be discharged through the discharge pipe 270.

[0041] As an optional implementation, a temporary storage tank 280 for temporarily storing sodium sulfate solution is also included. Multiple evaporators 110 are provided, and each evaporator 110 is connected to the temporary storage tank 280 through a corresponding feed pump 130. The temporary storage tank 280 can store sodium sulfate solution in large quantities, so that sodium sulfate solution can be injected into multiple evaporators 110 at the same time for evaporation treatment, thereby achieving the function of batch processing.

[0042] As an optional implementation, a spiral preheating pipe 290 is provided inside the temporary storage tank 280. The top of the spiral preheating pipe 290 is connected to a second exhaust pipe 310 extending out of the temporary storage tank 280, and the bottom of the spiral preheating pipe 290 is connected to a gas collecting cylinder 320. The first exhaust pipe 170 in each evaporator 110 extends into the temporary storage tank 280 and is connected to the gas collecting cylinder 320.

[0043] In this embodiment, the gas in the first exhaust pipe 170 of each evaporator 110 can be concentrated and discharged into the gas collection cylinder 320, and then flow into the spiral preheating pipe 290. At this time, the gas still has a certain temperature, which can preheat the sodium sulfate solution in the temporary storage tank 280, making full use of the heat energy of the high-temperature gas. After the secondary heat exchange, the gas is finally discharged from the second exhaust pipe 310.

[0044] As an optional implementation, a second solenoid valve 330 is connected between the first exhaust pipe 170 and the gas collector 320. The second solenoid valve 330 can individually control whether each first exhaust pipe 170 is connected to the gas collector 320. When only some evaporators 110 are in use, the first exhaust pipes 170 corresponding to the remaining unused evaporators 110 are not connected to the gas collector 320, so as to prevent high-temperature gas from flowing into the first exhaust pipes 170 corresponding to the unused evaporators 110.

[0045] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A liquid level controlled evaporation system, characterized in that, The system includes an evaporator, with a feed pipe connected to the top of the evaporator. The feed pipe is connected to a feed pump, which is electrically connected to a controller. A liquid level sensor is installed on the top of the evaporator. The liquid level sensing mechanism includes at least three support rods connected to the top of the evaporator and arranged in a circular array. A support plate is connected to the bottom of the support rods, and a buoyancy ball is set on the support plate. The buoyancy ball is located between the support rods. A movable plate is also movably sleeved on the support rods above the buoyancy ball. The movable plate is used to contact the buoyancy ball. A touch rod is connected to the top of the movable plate. The touch rod moves through the top of the evaporator. A bracket is set at the top of the evaporator. A trigger switch is set at the bottom of the bracket and located directly above the touch rod. The trigger switch is used to contact the touch rod and is electrically connected to the controller.

2. The liquid level control evaporation system as described in claim 1, characterized in that, A limiting plate is fixedly sleeved on the contact rod, and the limiting plate is attached to the top of the evaporator to create a gap between the movable plate and the buoyancy ball.

3. The liquid level control evaporation system as described in claim 1, characterized in that, The evaporator is equipped with a spiral evaporator tube. The bottom of the spiral evaporator tube is connected to a first exhaust pipe that extends out of the evaporator tube, and the top of the spiral evaporator tube is connected to an air inlet pipe that extends out of the top of the evaporator tube.

4. The liquid level control evaporation system as described in claim 3, characterized in that, A three-way solenoid valve is connected between the top of the spiral evaporator tube and the air inlet pipe. The three-way solenoid valve is connected to an air outlet pipe, which is higher than the upper limit liquid level. A pressure sensor is installed on the top of the evaporator. Both the pressure sensor and the three-way solenoid valve are electrically connected to the controller. The upper limit liquid level is the upper limit position of the buoyancy ball.

5. The liquid level control evaporation system as described in claim 1, characterized in that, A vibrator is installed on the outer wall of the evaporator. The vibrator is connected to a vibration transmission block located inside the evaporator. The vibration transmission block is connected to a vibration frame that contacts the spiral evaporator tube.

6. The liquid level control evaporation system as described in claim 5, characterized in that, The vibration frame includes a vertical plate connected to the vibration transmission block. On the side of the vertical plate near the spiral evaporator tube, there are multiple contact frames arranged from top to bottom. The contact frames are used to contact the spiral evaporator tube.

7. The liquid level control evaporation system as described in claim 1, characterized in that, The bottom of the evaporator is equipped with a first solenoid valve, and the bottom of the first solenoid valve is connected to a discharge pipe.

8. The liquid level control evaporation system as described in claim 1, characterized in that, It also includes a temporary storage tank for temporarily storing sodium sulfate solution. There are multiple evaporators, and each evaporator is connected to the temporary storage tank through a corresponding feed pump.

9. The liquid level control evaporation system as described in claim 8, characterized in that, The temporary storage tank is equipped with a spiral preheating pipe. The top of the spiral preheating pipe is connected to a second exhaust pipe that extends out of the temporary storage tank, and the bottom of the spiral preheating pipe is connected to a gas collecting cylinder. The first exhaust pipe in each evaporator extends into the temporary storage tank and is connected to the gas collecting cylinder.

10. The liquid level control evaporation system as described in claim 9, characterized in that, A second solenoid valve is connected between the first exhaust pipe and the air manifold.

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