A reaction device for solid-liquid mixed system and operation method thereof

Abstract

The present invention discloses a solid-liquid mixing system reaction device, which mainly includes: a reactor, a stirring device, a liquid level gauge and a multi-stage stirring device controller. The reaction device provided by the present invention is provided with a multi-stage stirring. For a solid-liquid mixing reaction system, especially a reaction system with poor fluidity in which a large amount of solid products are generated by a liquid-liquid reaction, the reaction device can effectively avoid the occurrence of solid material sticking to the wall, increase the mass and heat transfer efficiency of the reaction system, and improve product quality. At the same time, a PLC interlocking control is provided between the reactor liquid level gauge and the multi-stage stirring. As the material liquid level in the reactor rises or falls, the stirring of each stage can be automatically opened or closed, which is beneficial to the effective distribution of power of the stirring system. The device has a simple structure, is easy to operate, is easy to realize automatic control, is applicable to all solid-liquid reaction systems, and is suitable for industrial promotion.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, in particular to a reaction device for a solid-liquid mixing system and an operating method thereof. Background Art

[0002] During a chemical reaction, the materials in the reaction system exist in liquid, solid, or a mixed state of solid and liquid. Especially for a reaction system in which a liquid participates in the reaction to generate a solid substance, as the reaction continues, the fluidity of the system materials gradually deteriorates, and a large amount of solid precipitates will adhere to the wall of the reactor. In addition, the solid material aggregation process often coats a small amount of unreacted liquid raw materials or reaction intermediates, causing the reaction system to have a reduced mass transfer and heat transfer efficiency, directly affecting the quality of the synthesized product, and even causing material accumulation in the system, reaction overshoot, and other phenomena, seriously affecting production safety. The single-type stirring devices such as paddle type, plate and frame type, or anchor type configured in existing reactors are difficult to fundamentally meet and solve a series of problems caused by solid material adhering to the wall during the production process due to the limitations of their stirring space and stirring dimensions. Summary of the Invention

[0003] The present invention aims to provide a solid-liquid mixing system reaction device and operating method thereof to address the problems raised in the aforementioned background art. By providing a PLC interlocking control system between the reactor liquid level gauge and the multi-stage agitator, each stage of agitation can be automatically opened or closed as the material level in the reactor rises or falls, facilitating efficient power distribution in the agitation system. This device has a simple structure, is easy to operate, and easily implements automated control. It is applicable to all solid-liquid reaction systems and is suitable for industrial promotion.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: A device for solid-liquid mixed system reaction, comprising a reactor, a multi-stage stirring controller is provided at the upper end of the reactor, the multi-stage stirring controller includes a PLC interlocking device and multiple control switches, a liquid level gauge is provided on one side of the reactor, a circulating medium outlet is provided on the other side of the reactor, a circulating interlayer medium inlet is provided at the lower end of the liquid level gauge, a material outlet is provided at the lower end of the reactor, a discharge valve is provided on the material outlet, a stirring device is provided in the reactor, the stirring device includes a main stirring rod and multiple stirring mechanisms, the main stirring rod is provided with multiple stirring mechanisms, the main stirring rod is respectively controlled by the multiple stirring mechanisms through the PLC interlocking device, a main stirring scraper is provided at the lower end of the main stirring rod, the multiple stirring mechanisms include multiple stirring rods and multiple stirring scrapers, the multiple stirring rods are respectively provided with multiple stirring scrapers, the multiple stirring scrapers form a circulating medium interlayer between the multiple stirring scrapers and the inner wall of the reactor, and the number of stages of the multiple stirring mechanisms is n≥2.

[0005] The stirring mechanism is fixedly connected to the main stirring rod via a spherical connecting shaft. The stirring mechanism opens and closes up and down at an angle of 90 degrees around the main stirring rod with the spherical connecting shaft as the center.

[0006] The stirring scraper and the stirring mechanism are opened and closed synchronously.

[0007] The material of the stirring rod, the main stirring scraper and the stirring scraper is any one of enamel, polytetrafluoroethylene, stainless steel and glass enamel, or a combination of two of them.

[0008] The main stirring scraper and the stirring scraper are in any one of arc, linear and rectangular shapes.

[0009] The multiple stirring mechanisms include a first stirring mechanism and a second stirring mechanism, the second stirring mechanism is arranged above the first stirring mechanism, the first stirring mechanism includes a first stirring rod and a first stirring scraper, one end of the first stirring rod is connected to the main stirring rod, and the other end of the first stirring rod is connected to the first stirring scraper, the second stirring mechanism includes a second stirring rod and a second stirring scraper, one end of the second stirring rod is connected to the main stirring rod, and the other end of the second stirring rod is connected to the second stirring scraper.

[0010] The distances between the first stirring rod and the second stirring rod and the inner wall of the reactor are d, the vertical distance between the first stirring rod and the second stirring rod is l, the heights of the first stirring scraper and the second stirring scraper are h, the radius of the reactor is r, d=0.86r, d≤l,

[0011] The first stirring scraper includes an upper scraper and a lower scraper. The upper scraper is installed on the upper end of the first stirring rod, and the lower scraper is connected to the lower end of the first stirring rod. The upper scraper and the lower scraper are respectively movably connected to the first stirring rod.

[0012] A plurality of stirring mechanism control panels are provided at the top end of the main stirring rod, and a plurality of control switches of the stirring mechanisms are respectively provided on the control panels. The control switches are electrically connected to the PLC interlocking device. The plurality of stirring mechanisms are respectively connected to the PLC interlocking device through lines, and the lines are installed inside the main stirring rod.

[0013] A method for operating a device for a solid-liquid mixed system reaction comprises the following steps:

[0014] S1: During the addition of the reaction material, the liquid level meter and the multi-stage stirring controller are connected via a PLC interlocking device for signal feedback. When the liquid level meter indicates that the liquid level of the material in the reactor is higher than the upper end of the first stirring scraper of the first stirring mechanism of the multiple stirring mechanisms, and the liquid level meter indicates that the multiple stirring mechanisms are lower than the lower end of the second stirring scraper of the second stirring mechanism, the PLC interlocking device is used to control the first stirring mechanism to start and the second stirring mechanism to stop.

[0015] S2: At this time, the upper scraper and the lower scraper on the second stirring scraper of the second stirring mechanism are respectively merged inward, and the upper scraper and the lower scraper are respectively arranged in parallel with the second stirring rod, and at the same time the second stirring rod is merged downward, and the second stirring rod is parallel to the main stirring rod, thereby reducing the stirring resistance of the second stirring mechanism when not in operation and reducing energy consumption. When the liquid level gauge shows that the liquid level is higher than the upper scraper at the upper end of the second stirring scraper, the second stirring mechanism will be automatically controlled to unfold through the PLC interlocking device, and the second stirring mechanism will unfold to rotate, and so on, to realize automatic opening and closing operation control of the stirring device.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The setting of multi-stage stirring scrapers can effectively prevent the occurrence of solid material sticking to the wall, increase the mass and heat transfer efficiency of the reaction system, and improve product quality;

[0018] 2. By setting up PLC interlocking control between the reactor level gauge and the multi-stage stirring, the stirring at each stage can be automatically opened or closed as the material level in the reactor rises or falls, which is conducive to the effective distribution of power in the stirring system;

[0019] 3. This device has a simple structure, is easy to operate, and is easy to realize automatic control. It is applicable to all solid-liquid reaction systems and is suitable for industrial promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structural principle of the reactor of the present invention.

[0021] Figure 2 It is a schematic diagram of the structural principle of the stirring device of the reactor of the present invention.

[0022] Figure numerals: 1, reactor, 2, stirring device, 3, liquid level gauge, 4, multi-stage stirring controller, 5, PLC interlocking device, 6, control switch, 7, stirring rod, 8, stirring scraper, 9, first stirring mechanism, 10, second stirring mechanism, 11, first stirring rod, 12, first stirring scraper, 13, second stirring rod, 14, second stirring scraper, 15, upper scraper, 16, lower scraper, 102, circulating interlayer medium inlet, 103, circulating interlayer medium outlet, 104, reactor material outlet, 105, reactor material outlet control valve, 201, spherical connecting shaft, 202, multiple stirring mechanisms, 203, main stirring rod, 204, main stirring scraper, 401, first-stage control switch, 402, second-stage control switch. DETAILED DESCRIPTION

[0023] The following content describes the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0024] Example 1:

[0025] A device for solid-liquid mixed system reaction, comprising a reactor 1, wherein a multi-stage stirring controller 4 is provided at the upper end of the reactor 1, wherein the multi-stage stirring controller 4 includes a PLC interlocking device 5 and a plurality of control switches 6, a liquid level gauge 3 is provided on one side of the reactor 1, a circulating medium outlet 103 is provided on the other side of the reactor 1, a circulating interlayer medium inlet 102 is provided at the lower end of the liquid level gauge 3, a reactor material outlet 104 is provided at the lower end of the reactor 1, and a reactor material outlet control valve 105 is provided on the reactor material outlet 104. A stirring device 2 is provided in the reactor 1, and the stirring device 2 includes a main stirring rod 203 and multiple stirring mechanisms 202. Multiple stirring mechanisms 202 are provided on the main stirring rod 203, and the main stirring rod 203 is respectively controlled by the multiple stirring mechanisms 202 through a PLC interlocking device 5. A main stirring scraper 204 is provided at the lower end of the main stirring rod 203, and the multiple stirring mechanisms 202 include multiple stirring rods 7 and multiple stirring scrapers 8. Multiple stirring scrapers 8 are respectively provided on the multiple stirring rods 7, and the number of levels of the multiple stirring mechanisms 202 is n≥2.

[0026] The plurality of stirring mechanisms 202 are fixedly connected to the main stirring rod 203 via a spherical connecting shaft. The stirring mechanisms open and close up and down at an angle of 90° around the main stirring rod 203 with the spherical connecting shaft 201 as the center.

[0027] The stirring scraper 8 is opened and closed synchronously with the stirring mechanism.

[0028] The stirring rod 7 , the main stirring scraper 204 and the stirring scraper 8 are made of any one of enamel, polytetrafluoroethylene, stainless steel and glass enamel, or a combination of two of them.

[0029] The main stirring scraper 204 and the stirring scraper 8 can be in any one of arc, linear and rectangular shapes.

[0030] The multiple stirring mechanisms 202 include a first stirring mechanism 9 and a second stirring mechanism 10, the second stirring mechanism 10 is arranged above the first stirring mechanism 9, the first stirring mechanism 9 includes a first stirring rod 11 and a first stirring scraper 12, one end of the first stirring rod 11 is connected to the main stirring rod 203, and the other end of the first stirring rod 11 is connected to the first stirring scraper 12, the second stirring mechanism 10 includes a second stirring rod 13 and a second stirring scraper 14, one end of the second stirring rod 13 is connected to the main stirring rod 203, and the other end of the second stirring rod 13 is connected to the second stirring scraper 14.

[0031] The distances between the first stirring rod 11 and the second stirring rod 13 and the inner wall of the reactor are d, the vertical distance between the first stirring rod 11 and the second stirring rod 13 is l, the heights of the first stirring scraper 12 and the second stirring scraper 14 are h, the radius of the reactor 1 is r, d=0.86r, d≤l,

[0032] The first stirring scraper 12 includes an upper scraper 15 and a lower scraper 16. The upper scraper 15 is installed on the upper end of the first stirring rod 11, and the lower scraper 16 is connected to the lower end of the first stirring rod 11. The upper scraper 15 and the lower scraper 16 are respectively movably connected to the first stirring rod 11.

[0033] Preferably, a plurality of stirring mechanism 202 control panels are provided at the top of the main stirring rod 203, and a plurality of control switches for the stirring mechanisms 202 are respectively provided on the control panel. The control switch 6 is electrically connected to the PLC interlocking device 5, and the plurality of stirring mechanisms 202 are respectively connected to the PLC interlocking device 5 through lines, and the lines are installed inside the main stirring rod 203. The first stirring mechanism 9 and the second stirring mechanism 10 are respectively controlled by the first-stage control switch 401 and the second-stage control switch 402.

[0034] Preferably, a method for operating a device for solid-liquid mixed system reaction comprises the following steps:

[0035] S1: During the addition of the reaction materials, the liquid level meter 3 and the multi-stage stirring controller 4 perform signal feedback via the PLC interlocking device 5. When the liquid level meter 3 indicates that the liquid level of the material in the reactor 1 is higher than the upper end of the first stirring scraper 12 of the first stirring mechanism 9 of the multiple stirring mechanisms 202, and the liquid level meter 3 indicates that the multiple stirring mechanisms 202 are lower than the lower end of the second stirring scraper 14 of the second stirring mechanism 10, the PLC interlocking device 5 controls the start of the first stirring mechanism 9 and the stop of the second stirring mechanism 10.

[0036] S2: At this time, the upper scraper 15 and the lower scraper 16 on the second stirring scraper 14 of the second stirring mechanism 10 are respectively merged inward, and the upper scraper 15 and the lower scraper 16 are respectively arranged in parallel with the second stirring rod 13, and at the same time the second stirring rod 13 is merged downward, and the second stirring rod 13 is parallel to the main stirring rod 203, so as to reduce the stirring resistance of the second stirring mechanism 10 when not in operation and reduce energy consumption. When the liquid level gauge shows that the liquid level is higher than the upper scraper at the upper end of the second stirring scraper 14, the second stirring mechanism 10 is automatically controlled to be unfolded through the PLC interlocking device 5, and the second stirring mechanism 10 is unfolded to rotate, and so on, to realize the automatic opening and closing operation control of the stirring device.

[0037] Example 2

[0038] This embodiment process takes the reaction of liquid materials with liquid materials to generate solid substances to form a solid-mixture system as an example, wherein:

[0039] The reactor is made of 5000L ceramic material, the main stirring rod of the reactor is 3m long, and the main stirring is a glass-lined anchor stirring device; the main stirring rod is connected to the stirring connecting shaft with a multi-stage stirring device that can be automatically opened and closed.

[0040] Under the heat exchange conditions of the reactor medium interlayer, liquid raw materials A and liquid raw materials B are pumped into the reactor 1 through the feed port. As the liquid raw material C is added dropwise to the reactor to generate the solid product D, the fluidity of the system gradually deteriorates. Under the action of the anchor-type main stirring 203, the solid material appears to stick to the wall. When the material in the reactor 1 reaches a certain liquid level, the PLC interlocking system set between the liquid level meter 3 connected to the reactor and the stirring controllers 4 at each stage automatically opens multiple stirring mechanisms 202 step by step, and at the same time, the main stirring scrapers 204 set at both ends of each stage of stirring are opened, and the main stirring scrapers 204 are put into operation under the power of the main stirring 203, and the solid material D adhering to the wall of the reactor 1 is effectively broken up and evenly mixed in the reaction system. When the reaction is completed, the reactor material outlet control valve 105 is opened, and the material is collected through the reactor material outlet 104.

[0041] The stirring device 2 is a retractable device consisting of a main stirring device 203, a plurality of stirring mechanisms 202 and a main stirring scraper 204;

[0042] The plurality of stirring mechanisms 202 and the main stirring rod 203 are fixedly connected by spherical connecting shafts 201a and 201b;

[0043] The plurality of stirring mechanisms 202 can be opened and closed up and down at a 90° angle around the main stirring rod with the connecting shaft as the center;

[0044] The main stirring scraper 204 can be extended and retracted at a 90° angle to the ends of the stirring rods at each level;

[0045] The materials of the plurality of stirring mechanisms 202 and the main stirring scraper 204 can be selected from any one of enamel, polytetrafluoroethylene, stainless steel or glass lining, preferably polytetrafluoroethylene;

[0046] Wherein, the main stirring scraper 204 is preferably a straight line;

[0047] The plurality of stirring mechanisms 202 are in a vertical interactive relationship with the main stirring rod 203 when in operation and are in an axisymmetric relationship along the main stirring rod;

[0048] In the operating state, the length between the two-stage connecting shaft is l=1.0m, the distance between the horizontal connecting shaft of each stage and the kettle wall is d≈r=0.86m, and the vertical height of each stirring scraper is h=0.9m;

[0049] Wherein, the stirring controller 4 at each level is provided with a first-level control switch 401 and a second-level control switch 402 corresponding to each level of stirring;

[0050] Among them, the specific working principle of the PLC interlocking device set between the liquid level meter 3 and the stirring controllers 4 at each level is: when the material liquid level in the reactor 1 is higher than the high end of the first-level expanded stirring scraper and lower than the low end position of the second-level stirring scraper, the multiple stirring mechanisms 202 and the main stirring scraper 204 are turned on through the PLC interlocking control. On the contrary, when the material liquid level in the reactor is displayed to be lower than the low end of the second level and higher than the high end of the first level, the PLC interlocking device will automatically control the higher-level stirring to shrink, so as to realize the automatic opening and closing operation control of the stirring device.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions are deemed to be within the scope of protection of the present invention.

Claims

1. A device for solid-liquid mixed system reaction, comprising a reactor, characterized in that: A multi-stage stirring controller is provided at the upper end of the reactor, and the multi-stage stirring controller includes a PLC interlocking device and multiple control switches. A liquid level gauge is provided on one side of the reactor, and a circulating interlayer medium outlet is provided on the other side of the reactor. A circulating medium inlet is provided at the lower end of the liquid level gauge, and a material outlet is provided at the lower end of the reactor. A discharge valve is provided on the material outlet. A stirring device is provided in the reactor, and the stirring device includes a main stirring rod and multiple stirring mechanisms. Multiple stirring mechanisms are provided on the main stirring rod, and the main stirring rod is respectively controlled by the multiple stirring mechanisms through the PLC interlocking device. A main stirring scraper is provided at the lower end of the main stirring rod, and the multiple stirring mechanisms include multiple stirring rods and multiple stirring scrapers. Multiple stirring scrapers are respectively provided on the multiple stirring rods, and a circulating medium interlayer is formed between the multiple stirring scrapers and the inner wall of the reactor. The number of stages of the multiple stirring mechanisms is n≥2; The stirring mechanism is fixedly connected to the main stirring rod via a spherical connecting shaft, and the stirring mechanism opens and closes up and down at a 90° angle around the main stirring rod with the spherical connecting shaft as the center; the stirring scraper opens and closes up and down synchronously with the stirring mechanism; The plurality of stirring mechanisms include a first stirring mechanism and a second stirring mechanism, wherein the second stirring mechanism is provided above the first stirring mechanism, the first stirring mechanism includes a first stirring rod and a first stirring scraper, one end of the first stirring rod is connected to the main stirring rod, and the other end of the first stirring rod is connected to the first stirring scraper, the second stirring mechanism includes a second stirring rod and a second stirring scraper, one end of the second stirring rod is connected to the main stirring rod, and the other end of the second stirring rod is connected to the second stirring scraper; The first stirring scraper includes an upper scraper and a lower scraper. The upper scraper is installed on the upper end of the first stirring rod, and the lower scraper is connected to the lower end of the first stirring rod. The upper scraper and the lower scraper are respectively movably connected to the first stirring rod.

2. The device for solid-liquid mixed system reaction according to claim 1, characterized in that: The material of the stirring rod, the main stirring scraper and the stirring scraper is any one of enamel, polytetrafluoroethylene, stainless steel and glass enamel, or a combination of two of them.

3. The device for solid-liquid mixed system reaction according to claim 1, characterized in that: The main stirring scraper and the stirring scraper are in any one of arc, linear and rectangular shapes.

4. The device for solid-liquid mixed system reaction according to claim 1, characterized in that: A plurality of stirring mechanism control panels are provided at the top end of the main stirring rod, and a plurality of control switches of the stirring mechanisms are respectively provided on the control panels. The control switches are electrically connected to the PLC interlocking device. The plurality of stirring mechanisms are respectively connected to the PLC interlocking device through lines, and the lines are installed inside the main stirring rod.

5. A method for operating a device for solid-liquid mixed system reaction, characterized in that: The device for solid-liquid mixed system reaction is a device for solid-liquid mixed system reaction according to any one of claims 1 to 4, comprising the following steps: S1: During the addition of the reaction material, the liquid level meter and the multi-stage stirring controller are connected via a PLC interlocking device for signal feedback. When the liquid level meter indicates that the liquid level of the material in the reactor is higher than the upper end of the first stirring scraper of the first stirring mechanism of the multiple stirring mechanisms, and the liquid level meter indicates that the multiple stirring mechanisms are lower than the lower end of the second stirring scraper of the second stirring mechanism, the PLC interlocking device is used to control the first stirring mechanism to start and the second stirring mechanism to stop. S2: At this time, the upper scraper and the lower scraper on the second stirring scraper of the second stirring mechanism are respectively merged inward, and the upper scraper and the lower scraper are respectively arranged in parallel with the second stirring rod, and at the same time the second stirring rod is merged downward, and the second stirring rod is parallel to the main stirring rod, thereby reducing the stirring resistance of the second stirring mechanism when not in operation and reducing energy consumption. When the liquid level gauge shows that the liquid level is higher than the upper scraper at the upper end of the second stirring scraper, the second stirring mechanism will be automatically controlled to unfold through the PLC interlocking device, and the second stirring mechanism will unfold to rotate, and so on, to realize automatic opening and closing operation control of the stirring device.

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