A continuous efficient lithium bicarbonate pyrolysis device

Abstract

The utility model discloses a kind of lithium bicarbonate continuous high-efficiency pyrolysis devices, comprising: main reactor, for lithium bicarbonate solution to carry out pyrolysis reaction;First heat exchanger, with main reactor communication, the gas after lithium bicarbonate solution pyrolysis in main reactor enters first heat exchanger;Transfer container, with main reactor communication, transfer container is used to collect pyrolysis mother liquor after lithium bicarbonate solution pyrolysis;Second heat exchanger, with transfer container connection, transfer container is used to supply pyrolysis mother liquor to second heat exchanger;Supply equipment, for supplying lithium bicarbonate solution to first heat exchanger, second heat exchanger;Three-way pipe, for communicating first heat exchanger, second heat exchanger and main reactor, first heat exchanger, second heat exchanger supply lithium bicarbonate solution in main reactor by three-way pipe.The lithium bicarbonate continuous high-efficiency pyrolysis device of the application utilizes the waste heat of pyrolysis device, effectively reduces resource waste.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium carbonate processing equipment, and in particular to a continuous and efficient pyrolysis device for lithium bicarbonate. Background Technology

[0002] Lithium bicarbonate solution preparation is an intermediate step in reducing impurities and improving the purity of lithium carbonate. In crude lithium carbonate, excess carbon dioxide is passed through to convert the poorly soluble lithium carbonate into a water-soluble lithium bicarbonate solution. The lithium bicarbonate solution then decomposes during heating, producing carbon dioxide and high-purity lithium carbonate. Existing pyrolysis devices do not utilize the carbon dioxide generated during pyrolysis or the waste heat from the pyrolysis mother liquor, resulting in resource waste. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a continuous, high-efficiency pyrolysis device for lithium bicarbonate, which utilizes the waste heat of the pyrolysis unit, effectively reducing resource waste.

[0004] The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to an embodiment of the present invention includes:

[0005] The main reactor is used for the pyrolysis reaction of lithium bicarbonate solution.

[0006] The first heat exchanger is connected to the main reactor, and the gas produced by the pyrolysis of the lithium bicarbonate solution in the main reactor enters the first heat exchanger.

[0007] A transfer container, connected to the main reactor, is used to collect the pyrolysis mother liquor after the lithium bicarbonate solution is pyrolyzed;

[0008] A second heat exchanger is connected to the transfer container, which supplies pyrolysis mother liquor to the second heat exchanger.

[0009] Supply equipment for supplying lithium bicarbonate solution to the first heat exchanger and the second heat exchanger;

[0010] A three-way pipe is used to connect the first heat exchanger, the second heat exchanger, and the main reactor. The first heat exchanger and the second heat exchanger supply lithium bicarbonate solution to the main reactor through the three-way pipe.

[0011] The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to the embodiments of the present invention has at least the following beneficial effects:

[0012] By setting up a first heat exchanger to collect the waste heat of the gas after the pyrolysis of the lithium bicarbonate solution for preheating the lithium bicarbonate solution, and setting up a second heat exchanger to collect the waste heat of the pyrolysis mother liquor for preheating the lithium bicarbonate solution, resource waste is effectively reduced, resource utilization is improved, and continuous operation of the pyrolysis unit is facilitated.

[0013] According to some embodiments of the present invention, the main reactor is equipped with a stirrer and a liquid guide tube. The stirrer includes a stirring paddle that extends into the main reactor for stirring the lithium bicarbonate solution. The liquid guide tube is installed inside the main reactor and covers the outer periphery of the stirring paddle.

[0014] The stirring paddle is positioned below the liquid guiding cylinder, and the distance between the stirring paddle and the liquid guiding cylinder is 20cm to 50cm.

[0015] According to some embodiments of the present invention, the upper end of the liquid guide tube is provided with an overflow collection tank for collecting pyrolysis mother liquor, and the overflow collection tank is connected to the transfer container through an overflow pipe.

[0016] According to some embodiments of the present invention, the three-way pipe includes a first interface, a second interface and a third interface, the first interface is connected to the first heat exchanger, the second interface is connected to the second heat exchanger, and the third interface extends from top to bottom into the main reactor;

[0017] The first interface is connected to the upper part of the first heat exchanger, and / or the second interface is connected to the upper part of the second heat exchanger.

[0018] According to some embodiments of the present invention, the third interface extends vertically to 40% to 50% of the main reactor.

[0019] According to some embodiments of the present invention, the first heat exchanger is provided with a first liquid inlet and a first liquid outlet. The lithium bicarbonate solution enters the first heat exchanger from the first liquid inlet and flows out of the first heat exchanger from the first liquid outlet.

[0020] The first liquid inlet is located at the bottom of the first heat exchanger, and the first liquid outlet is located at the top of the first heat exchanger; the supply device is connected to the first liquid inlet.

[0021] According to some embodiments of the present invention, the second heat exchanger is provided with a second inlet and a second outlet. The lithium bicarbonate solution enters the second heat exchanger from the second inlet and flows out of the second heat exchanger from the second outlet.

[0022] The second liquid inlet is located at the bottom of the second heat exchanger, and the second liquid outlet is located at the top of the second heat exchanger; the supply device is connected to the second liquid inlet.

[0023] According to some embodiments of the present invention, a first heating coil is installed inside the first heat exchanger, and the first heating coil is connected to the main reactor;

[0024] The second heat exchanger is equipped with a second heating coil, which is connected to the transfer container.

[0025] According to some embodiments of the present invention, the height-to-diameter ratio of the first heat exchanger and / or the second heat exchanger is 5:1 to 8:1.

[0026] According to some embodiments of the present invention, the main reactor is provided with a storage bin at the bottom, and the storage bin is provided with a discharge port at the bottom;

[0027] The main reactor is equipped with a steam jacket on its outer peripheral wall. The steam jacket has a steam inlet at the top and a steam outlet at the bottom.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0031] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0032] Icon labels:

[0033] Main reactor 100, stirrer 110, stirring paddle 111, stirring motor 112, stirring rod 113, liquid guide tube 120, overflow pipe 121, storage bin 130, discharge port 131, steam jacket 140, steam inlet 141, steam outlet 142;

[0034] First heat exchanger 200, first liquid inlet 210, first liquid outlet 220, first heating coil 230, air inlet pipe 240, drain outlet 241, exhaust outlet 250;

[0035] Transfer container 300, transfer pump 310;

[0036] Second heat exchanger 400, second liquid inlet 410, second liquid outlet 420, second heating coil 430;

[0037] T-shaped pipe 500, first interface 510, second interface 520, third interface 530. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, etc., indicating the directional or positional relationship, are based on the directional or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] Reference Figure 1 , Figure 2 This invention discloses a continuous high-efficiency pyrolysis device for lithium bicarbonate, comprising a main reactor 100, a first heat exchanger 200, and a second heat exchanger 400. The main reactor 100 is used for the pyrolysis reaction of a lithium bicarbonate solution. Both the first heat exchanger 200 and the second heat exchanger 400 are connected to the main reactor 100. After the lithium bicarbonate solution is pyrolyzed, it generates pyrolysis mother liquor and tail gases such as carbon dioxide. Both the pyrolysis mother liquor and the tail gases have high temperatures. The efficient use of the waste heat from the pyrolysis mother liquor and the tail gases can significantly improve resource utilization. To further improve resource utilization, the first heat exchanger 200 in this embodiment uses the waste heat from the tail gases such as carbon dioxide to preheat the lithium bicarbonate solution entering the main reactor 100, and the second heat exchanger 400 uses the waste heat from the pyrolysis mother liquor to preheat the lithium bicarbonate solution entering the main reactor 100.

[0043] Specifically, in the embodiments of this utility model, the pyrolysis apparatus further includes a transfer container 300, a supply device, and a three-way pipe 500. The transfer container 300 is connected to the main reactor 100 and is used to collect the pyrolysis mother liquor after the lithium bicarbonate solution is pyrolyzed. Then, the pyrolysis mother liquor in the transfer container 300 is pumped to the second heat exchanger 400 by a transfer pump 310. The supply device is used to supply lithium bicarbonate solution to the first heat exchanger 200 and the second heat exchanger 400. The three-way pipe 500 is used to connect the first heat exchanger 200 and the second heat exchanger 400. The reactor consists of a first heat exchanger 200, a second heat exchanger 400, and a main reactor 100. The first heat exchanger 200 and the second heat exchanger 400 supply lithium bicarbonate solution to the main reactor 100 through a three-way pipe 500. The lithium bicarbonate solution is preheated in the first heat exchanger 200 and the second heat exchanger 400 before entering the main reactor 100 for pyrolysis. The preheated lithium bicarbonate solution reduces the time and heat required for further heating, thereby improving resource utilization and facilitating the continuous operation of the pyrolysis unit.

[0044] In the embodiments of this utility model, reference is made to Figure 1 , Figure 2 As shown, the main reactor 100 has a storage silo 130 at its bottom, and a discharge port 131 at its bottom. A steam jacket 140 is installed on the outer periphery of the main reactor 100, with a steam inlet 141 at its upper part and a steam outlet 142 at its bottom. Specifically, after pyrolysis, the lithium bicarbonate solution produces lithium carbonate precipitate, which accumulates in the storage silo 130. The discharge port 131 at the bottom of the storage silo 130 facilitates the discharge of the lithium carbonate precipitate. The pyrolysis reaction requires heating the lithium bicarbonate solution to above 90°C; therefore, a steam jacket 140 is installed outside the main reactor 100 to heat the lithium bicarbonate solution inside. The steam inlet 141 is located at the upper part of the steam jacket 140, and the steam outlet 142 is located at the lower part of the steam jacket 140, facilitating the full utilization of steam and the discharge of condensate after steam condensation.

[0045] In the embodiments of this utility model, reference is made to Figure 1As shown, the main reactor 100 is equipped with a stirrer 110 and a liquid guide tube 120. The stirrer 110 includes a stirring paddle 111, which extends into the main reactor 100 for stirring the lithium bicarbonate solution. The liquid guide tube 120 is installed inside the main reactor 100 and covers the outer periphery of the stirring paddle 111. The stirring paddle 111 is positioned below the liquid guide tube 120, with a distance of 20cm to 50cm between the stirring paddle 111 and the liquid guide tube 120. Specifically, the stirrer 110 also includes a stirring motor 112 and a stirring rod 113. The stirring rod 113 is connected to the output end of the stirring motor 112, and the stirring paddle 111 is installed at the end of the stirring rod 113. The stirring motor 112 is installed at the upper part of the main reactor 100. The rotation speed of the stirring paddle 111 is typically controlled at 10~100 rpm. The stirring paddle is positioned 20cm to 50cm below the lower edge of the liquid guide tube 120, serving to uniformly stir the lithium bicarbonate solution and lift the pyrolysis mother liquor.

[0046] In an embodiment of this utility model, the liquid guide cylinder 120 is a cylindrical body. The upper end of the liquid guide cylinder 120 is provided with an overflow collection tank for collecting pyrolysis mother liquor. The overflow collection tank is connected to the transfer container 300 through an overflow pipe 121. The pyrolysis mother liquor will enter the overflow collection tank under the lifting action of the stirring paddle 111, and then enter the transfer container 300 through the overflow pipe 121.

[0047] In an embodiment of this utility model, the first heat exchanger 200 is provided with a first inlet 210 and a first outlet 220. The lithium bicarbonate solution enters the first heat exchanger 200 through the first inlet 210 and flows out of the first heat exchanger 200 through the first outlet 220. The first inlet 210 is located at the bottom of the first heat exchanger 200, and the first outlet 220 is located at the top of the first heat exchanger 200. The supply device is connected to the first inlet 210. The structure of the second heat exchanger 400 is basically the same as that of the first heat exchanger 200. In this embodiment, the second heat exchanger 400 is provided with a second inlet 410 and a second outlet 420. The lithium bicarbonate solution enters the second heat exchanger 400 through the second inlet 410 and flows out of the second heat exchanger 400 through the second outlet 420. The second inlet 410 is located at the bottom of the second heat exchanger 400, and the second outlet 420 is located at the top of the second heat exchanger 400. The supply equipment is connected to the second inlet 410. The fact that the structures of the first heat exchanger 200 and the second heat exchanger 400 are basically the same helps to reduce the manufacturing and maintenance costs of the first heat exchanger 200 and the second heat exchanger 400.

[0048] In an embodiment of this utility model, a first heating coil 230 is installed inside the first heat exchanger 200, and the first heating coil 230 is connected to the main reactor 100. Specifically, refer to... Figure 1 , Figure 2As shown, the bottom end of the first heating coil 230 is connected to the main reactor 100 via an inlet pipe 240, and the top end of the first heating coil 230 is provided with an exhaust port 250. The carbon dioxide and other exhaust gases produced by the pyrolysis reaction in the main reactor 100 enter the first heating coil 230 from the bottom through the inlet pipe 240, and then exit from the exhaust port 250 at the top of the first heating coil 230. The first heating coil 230 is coiled within the first heat exchanger 200, which increases the contact area and contact time between the carbon dioxide and other exhaust gases and the lithium bicarbonate solution, thereby improving the preheating effect of the lithium bicarbonate solution. (Refer to...) Figure 2 As shown, the intake pipe 240 is also provided with a drain outlet 241 in the middle to drain the condensate in the intake pipe 240.

[0049] In an embodiment of this utility model, a second heating coil 430 is installed inside the second heat exchanger 400, and the second heating coil 430 is connected to the transfer container 300. Specifically, refer to... Figure 1 As shown, the bottom end of the second heating coil 430 is connected to the outlet of the transfer pump 310. The pyrolysis mother liquor enters from the bottom end of the second heating coil 430 and exits from the top end to the next processing step. Similarly, the second heating coil 430 is coiled inside the second heat exchanger 400, which can increase the contact area and contact time between the pyrolysis mother liquor and the lithium bicarbonate solution, thereby improving the preheating effect of the lithium bicarbonate solution.

[0050] In the embodiments of this utility model, the height-to-diameter ratio of the first heat exchanger 200 and / or the second heat exchanger 400 is 5:1 to 8:1. The height-to-diameter ratio of the first heat exchanger 200 and the second heat exchanger 400 can be set to be the same or different according to actual conditions, and is not limited in this embodiment.

[0051] In an embodiment of this utility model, the three-way pipe 500 includes a first interface 510, a second interface 520, and a third interface 530. The first interface 510 is connected to the first heat exchanger 200, the second interface 520 is connected to the second heat exchanger 400, and the third interface 530 extends from top to bottom into the main reactor 100. The first interface 510 is connected to the upper part of the first heat exchanger 200, and / or the second interface 520 is connected to the upper part of the second heat exchanger 400. Specifically, refer to... Figure 1 As shown, the first interface 510 is connected to the first outlet 220, the second interface 520 is connected to the second outlet 420, and the third interface 530 is located between the first interface 510 and the second interface 520, extending vertically to 40% to 50% of the main reactor 100. The extension of the third interface 530 to 40% to 50% of the main reactor 100 will not significantly impact the lithium bicarbonate solution in the main reactor 100, nor will it affect the downward precipitation of the lithium carbonate generated by pyrolysis.

[0052] The method of using the pyrolysis apparatus in this embodiment is as follows:

[0053] Lithium bicarbonate solution is injected into the main reactor 100, the first heat exchanger 200, and the second heat exchanger 400;

[0054] Steam is introduced into the steam jacket 140, and the agitator 110 is started;

[0055] When a large amount of water vapor appears at the exhaust port 250 at the top of the first heating coil 230, the supply equipment replenishes lithium bicarbonate solution into the first heat exchanger 200 through the first liquid inlet 210.

[0056] As the liquid level in the first heat exchanger 200 rises, the lithium bicarbonate solution in the first heat exchanger 200 enters the first port 510 of the three-way pipe 500 through the first outlet 220, and then enters the main reactor 100 through the third port 530.

[0057] As the liquid level in the main reactor 100 rises, the pyrolysis mother liquor generated by the main reactor 100 enters the overflow collection tank at the top of the liquid guide tube 120, and then enters the transfer container 300 through the overflow pipe 121.

[0058] Once the liquid level in the transfer container 300 reaches 50%, the transfer pump 310 is started to supply pyrolysis mother liquor to the second heating coil 430 to preheat the lithium bicarbonate solution in the second heat exchanger 400. When pyrolysis mother liquor flows out from the top of the second heating coil 430, the supply equipment replenishes the lithium bicarbonate solution in the second heat exchanger 400 through the second inlet 410. As the liquid level in the second heat exchanger 400 rises, the lithium bicarbonate solution in the second heat exchanger 400 enters the second port 520 of the three-way pipe 500 through the second outlet 420, and then enters the main reactor 100 through the third port 530.

[0059] Once the temperature of the main reactor 100 reaches the set temperature and is maintained for the set time, the pyrolyzed lithium carbonate is discharged from the main reactor 100 through the discharge port 131 from the storage bin 130.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0061] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A continuous high-efficiency pyrolysis device for lithium bicarbonate, characterized in that, include: The main reactor is used for the pyrolysis reaction of lithium bicarbonate solution. The first heat exchanger is connected to the main reactor, and the gas produced by the pyrolysis of the lithium bicarbonate solution in the main reactor enters the first heat exchanger. A transfer container, connected to the main reactor, is used to collect the pyrolysis mother liquor after the lithium bicarbonate solution is pyrolyzed; A second heat exchanger is connected to the transfer container, which supplies pyrolysis mother liquor to the second heat exchanger. Supply equipment for supplying lithium bicarbonate solution to the first heat exchanger and the second heat exchanger; A three-way pipe is used to connect the first heat exchanger, the second heat exchanger, and the main reactor. The first heat exchanger and the second heat exchanger supply lithium bicarbonate solution to the main reactor through the three-way pipe.

2. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The main reactor is equipped with a stirrer and a liquid guide tube. The stirrer includes a stirring paddle that extends into the main reactor for stirring the lithium bicarbonate solution. The liquid guide tube is installed inside the main reactor and covers the outer periphery of the agitator. The stirring paddle is positioned below the liquid guiding cylinder, and the distance between the stirring paddle and the liquid guiding cylinder is 20cm to 50cm.

3. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 2, characterized in that: The upper end of the liquid guide tube is provided with an overflow collection tank for collecting pyrolysis mother liquor, and the overflow collection tank is connected to the transfer container through an overflow pipe.

4. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The three-way pipe includes a first interface, a second interface, and a third interface. The first interface is connected to the first heat exchanger, the second interface is connected to the second heat exchanger, and the third interface extends from top to bottom into the main reactor. The first interface is connected to the upper part of the first heat exchanger, and / or the second interface is connected to the upper part of the second heat exchanger.

5. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 4, characterized in that: In the vertical direction, the third interface extends to 40% to 50% of the main reactor.

6. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The first heat exchanger is provided with a first inlet and a first outlet. The lithium bicarbonate solution enters the first heat exchanger from the first inlet and flows out of the first heat exchanger from the first outlet. The first liquid inlet is located at the bottom of the first heat exchanger, and the first liquid outlet is located at the top of the first heat exchanger; the supply device is connected to the first liquid inlet.

7. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The second heat exchanger is provided with a second inlet and a second outlet. The lithium bicarbonate solution enters the second heat exchanger from the second inlet and flows out of the second heat exchanger from the second outlet. The second liquid inlet is located at the bottom of the second heat exchanger, and the second liquid outlet is located at the top of the second heat exchanger; the supply device is connected to the second liquid inlet.

8. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The first heat exchanger is equipped with a first heating coil, which is connected to the main reactor. The second heat exchanger is equipped with a second heating coil, which is connected to the transfer container.

9. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The height-to-diameter ratio of the first heat exchanger and / or the second heat exchanger is 5:1 to 8:

1.

10. The continuous high-efficiency pyrolysis apparatus for lithium bicarbonate according to claim 1, characterized in that: The main reactor is provided with a storage bin at the bottom, and the storage bin is provided with a discharge port at the bottom; The main reactor is equipped with a steam jacket on its outer peripheral wall. The steam jacket has a steam inlet at the top and a steam outlet at the bottom.

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