A lithium hexafluorophosphate tail gas treatment system and treatment method

Abstract

The invention relates to the technical field of tail gas treatment, and in particular to a lithium hexafluorophosphate tail gas treatment system and a treatment method thereof, comprising a condenser, a hydrogen fluoride receiving tank, a reactor, an air intake filter structure, a lithium fluoride preparation kettle, a water scrubber and an alkali scrubber; wherein the tail gas is sequentially treated by passing through the air intake filter structure, the condenser, the reactor, the water scrubber and the alkali scrubber; the reactor of the invention has two reaction zones, each of which is provided with a stirring structure, and the stirring structure has a closed posture, a filtering posture and a drainage posture; in the closed posture, the stirring structure closes the exhaust end of the reaction zone; in the filtering posture, the stirring structure forms a filtering layer at the exhaust end of the reaction zone; in the drainage posture, the stirring structure forms a continuously active drainage surface, and the drainage surface can guide the movement of the exhaust gas entering from the air intake end; the invention filters the discharged tail gas and drains the incoming tail gas through the three postures of the stirring structure, so as to improve the treatment effect of the tail gas.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, and in particular to a lithium hexafluorophosphate tail gas treatment system and a treatment method thereof. Background Art

[0002] Lithium hexafluorolithium oxide is a key material for lithium-ion secondary batteries. It is a typical "three highs" technology product with high-tech, high-risk production environment and high difficulty in production. At present, the mainstream synthesis process of lithium hexafluorolithium oxide is the anhydrous hydrogen fluoride solvent method, and the exhaust gas produced by this method is a mixture of hydrogen chloride (HCL) and hydrogen fluoride (HF).

[0003] At present, in order to avoid affecting the environment and to recover hydrogen chloride and hydrogen fluoride to improve resource utilization, the tail gas is sent to a condenser and then lithium chloride (LiCL) is reacted with the tail gas discharged from the condenser to remove a large amount of hydrogen fluoride in the tail gas, and the tail gas is sent to a water washing tower and an alkali washing tower to remove hydrogen chloride, thereby achieving the purpose of purifying the tail gas. The above system can refer to a lithium hexafluorophosphate synthesis tail gas treatment method and special device (hereinafter referred to as D1) disclosed in authorization announcement No. CN105460893B.

[0004] However, although the current exhaust gas treatment system can basically complete the treatment of exhaust gas (still taking D1 as an example), there are still the following unfinished business:

[0005] 1. During the exhaust gas treatment process, the exhaust gas is first sent to the condenser, and the particulate impurities contained in the exhaust gas will affect the condensation effect of the exhaust gas;

[0006] 2. After the tail gas reacts with lithium chloride, the tail gas will take part of the lithium chloride powder away from the reactor. In order to avoid affecting the treatment of hydrogen chloride, a dust collector needs to be installed after the reactor. Therefore, multiple dust collectors are required to cooperate with the treatment of tail gas, which increases the cost of purchasing equipment for enterprises;

[0007] 3. When the tail gas enters the reactor and reacts, the flow path of the tail gas is single and as the reaction time increases, the lithium chloride content in the reactor decreases, thus affecting the reaction effect between the tail gas and lithium chloride, thereby affecting the treatment effect of the tail gas.

[0008] Therefore, it is necessary to improve the existing exhaust gas treatment system. Summary of the invention

[0009] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a lithium hexafluorophosphate tail gas treatment system and a treatment method thereof, aiming to solve the problems arising from the above-mentioned background technology.

[0010] The technical solution of the present invention is achieved as follows: a lithium hexafluorophosphate tail gas treatment system, characterized in that it includes:

[0011] A condensation module, consisting of a condenser and a hydrogen fluoride receiving tank;

[0012] A reaction device, comprising a reactor and an air intake filtering structure;

[0013] A lithium fluoride preparation kettle, receiving the residual material discharged from the reactor;

[0014] Water scrubber;

[0015] Alkali washing tower;

[0016] The tail gas is processed in sequence through the air intake filter structure, condenser, reactor, water scrubber and alkali scrubber;

[0017] The reactor has at least two reaction zones, each of which has an air inlet end and an exhaust end, and a stirring structure is provided in each reaction zone, and the stirring structure has at least a closed position, a filtering position and a drainage position when being controlled to move;

[0018] In the closed position, the stirring structure closes the exhaust end of the reaction zone;

[0019] In the filtering position, the stirring structure opens the exhaust end of the reaction zone and forms a filtering layer at the exhaust end of the reaction zone;

[0020] In the drainage position, the stirring structure forms a drainage surface that can be continuously moved, and the drainage surface can disperse and / or guide the movement of the exhaust gas entering from the intake end.

[0021] Preferably, the reactor comprises:

[0022] a body having a chamber;

[0023] At least two movable bodies move in the main body and divide the chamber into an air intake chamber and a plurality of exhaust chambers;

[0024] The reaction chamber is composed of a primary reaction chamber and a secondary reaction chamber formed in each movable body;

[0025] A connecting axis connects adjacent movable bodies;

[0026] An exhaust port is formed on the movable body and communicates the reaction chamber with the exhaust chamber;

[0027] Among them, a number of recessed areas are formed on the side wall of the movable body and can be controlled by the first driver to move up and down in the chamber, and a one-way air inlet nozzle connected to the reaction chamber is installed in each recessed area, and an air inlet pipe that can connect between each one-way air inlet nozzle and the condenser or between each one-way air inlet nozzle and the exhaust chamber is provided on the main body.

[0028] Preferably, the stirring structure comprises:

[0029] A driving shaft is rotatably mounted on the movable body, and two ends thereof are respectively located outside the reaction chamber and inside the reaction chamber;

[0030] A stirring shaft connected to the driving shaft;

[0031] A stirring blade is installed on the stirring shaft and is located inside the reaction chamber;

[0032] A screw is mounted on the driving shaft and is located outside the reaction chamber;

[0033] A limit plate is installed in the cavity of the main body and has a movable opening for the screw to pass through;

[0034] The nut is installed at the movable opening and cooperates with the screw;

[0035] Wherein, the matching part between the driving shaft and the stirring shaft and the matching part between the stirring shaft and the reaction chamber are respectively provided with a first unidirectional rotating structure and a second unidirectional rotating structure;

[0036] When the screw rotates forward, the driving shaft drives the stirring shaft to rotate forward through the first unidirectional rotating structure;

[0037] When the screw is reversed, the stirring shaft is prevented from reversing by the second unidirectional rotation structure.

[0038] Preferably, the first one-way rotating structure and the second one-way rotating structure both include:

[0039] The inner shaft has a plurality of grooves on its circumferential outer side wall;

[0040] The outer sleeve is coaxially arranged with the inner shaft, and a plurality of limit grooves are formed on the inner side wall of the outer sleeve;

[0041] Wherein, a limiting block cooperating with the limiting groove is rotatably connected in the groove, and a limiting spring is arranged between the limiting block and the groove.

[0042] Preferably, a drainage structure controlled by a driving shaft is provided in the reaction chamber, and the drainage structure comprises:

[0043] A drainage body is rotatably connected to the inner wall of the reaction chamber via a rotating shaft, and a circumferential outer wall of the drainage body forms a drainage surface;

[0044] A driving plate connected to the driving shaft and having a plurality of limiting openings for the movement of the rotating shaft;

[0045] A connecting rod, with two ends respectively hinged to the drainage body and the driving disc;

[0046] The slide rail is arranged on the driving disk and has an inclined guide rail surface;

[0047] Wherein, a filter element is slidably connected to the exhaust port, and the filter element is abutted against the slide rail through a supporting structure;

[0048] When the driving shaft rotates forward, the drainage body is spread out based on the stirring shaft, and the drainage direction of the drainage surface is adjusted;

[0049] When the driving shaft rotates reversely, the guide body is retracted based on the stirring shaft, and the reaction chamber is divided into a first inner chamber and a first outer chamber which are spaced apart from each other and arranged coaxially.

[0050] Preferably, the support structure comprises:

[0051] A sealing plate connected to the filter element;

[0052] A support shaft connected to the sealing plate, with one end abutting against the slide rail;

[0053] Wherein, a universal ball is arranged on the matching surface between the support shaft and the slide rail.

[0054] Preferably, the device further comprises a feeding mechanism, wherein the feeding mechanism comprises:

[0055] Source of materials;

[0056] A feeding body, comprising a primary feeding cavity, a secondary feeding cavity and a discharge cavity;

[0057] The piston body is composed of a first piston body movable in the primary feeding chamber and the secondary feeding chamber, and a second piston body movable in the discharge chamber;

[0058] A piston shaft connected to each of the first piston bodies and controlled to move by the second driver;

[0059] A return spring is installed in the discharge cavity and one end of the return spring abuts against the second piston body;

[0060] A plurality of feed check valves are installed on the feed body and are connected with the first-stage feed chamber, the second-stage feed chamber and the discharge chamber;

[0061] A plurality of discharge one-way valves are installed on the feeding body and are connected with the primary feeding chamber, the secondary feeding chamber and the discharge chamber;

[0062] The material pipe is composed of a first pipe body connected between the material source and the primary feeding chamber, a second pipe body connected between the primary feeding chamber and the secondary reaction chamber, a third pipe body connected between the secondary reaction chamber and the secondary feeding chamber, a fourth pipe body connected between the secondary feeding chamber and the primary reaction chamber, and a fifth pipe body connected between the primary reaction chamber and the discharge chamber;

[0063] Among them, the material source, the first feeding chamber, the second reaction chamber, the second feeding chamber, the first reaction chamber and the unloading chamber are connected by the feed check valve, the discharge check valve and the material pipe to form a one-way feeding branch that can feed material layer by layer.

[0064] Preferably, the air intake filter structure comprises:

[0065] The filter screen is arranged in the air inlet cavity and divides the air inlet cavity into a second inner cavity and a second outer cavity which are arranged coaxially;

[0066] A gas inlet is formed integrally with the movable body and has a telescopic cavity adapted to the filter;

[0067] An intake valve is installed on the main body and communicated with the second outer cavity, and allows exhaust gas to enter;

[0068] The exhaust valve is installed on the main body and communicated with the second inner cavity.

[0069] In addition, the present invention also provides a method for treating tail gas of lithium hexafluorophosphate, which uses the tail gas treatment system. The tail gas treatment method of the present invention comprises the following steps under the basis that the first driver controls the reciprocating lifting and lowering activities of each movable body:

[0070] S1: When the moving body rises and forms a negative pressure in the air intake chamber, exhaust gas is introduced into the air intake chamber for filtration, and when the moving body descends, the filtered exhaust gas in the air intake chamber is squeezed out and sent to the condenser;

[0071] S2: The tail gas is cooled and condensed in the condenser, and the condensed hydrogen fluoride gas in the tail gas enters the hydrogen fluoride receiving tank to obtain the first-level tail gas;

[0072] S3: The primary tail gas obtained in step S2 enters the reaction chamber from each one-way air inlet nozzle when the movable body descends, and enters the exhaust chamber from the exhaust port after reacting in the reaction chamber, and is further sent to another movable reaction chamber for secondary reaction, and then obtains the secondary tail gas;

[0073] S4: The secondary tail gas in step S3 is sent to a water scrubber and an alkali scrubber in sequence to remove hydrogen chloride gas and is discharged after meeting the standards, thus completing the tail gas treatment.

[0074] Preferably, it also includes a feeding method before step 1, an airflow guiding method in step S3, and a feeding method in any step from step S1 to step S5;

[0075] Wherein, the feeding method comprises:

[0076] When adding materials, the second driver is started for the first time, and controls the first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, and draws the reaction material in the material source into the primary feeding chamber, and as the first piston shaft moves, the reaction material in the primary feeding chamber is squeezed out and sent into the secondary reaction chamber;

[0077] After the reaction material is added to the secondary reaction chamber, the second driver is started again, and controls each first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, so that the reaction material in the secondary reaction chamber is drawn into the secondary feeding chamber, and the reaction material in the material source is drawn into the primary feeding chamber again, and along with the movement of the first piston shaft, the reaction material in the primary feeding chamber and the secondary feeding chamber is respectively sent into the secondary reaction chamber and the primary reaction chamber to complete the feeding;

[0078] The airflow guiding method comprises:

[0079] During the lifting process of the movable body, the one-way air inlet nozzles on the movable body are respectively connected with the air inlet pipes, and the exhaust gas entering the reaction chamber from the air inlet pipes is sent into the reaction chamber from different positions;

[0080] When the tail gas enters the reaction chamber, the guide body is controlled to expand by the driving disk, and the guide surface of the guide body is used to guide the tail gas to disperse and flow in the reaction chamber;

[0081] The feeding method comprises:

[0082] When feeding, the drainage body is controlled by the driving disk to be retracted, and a first inner cavity and a first outer cavity are formed in the reaction cavity;

[0083] When the second driver controls the first piston body and the second piston body to move back and forth, the reaction material in the first outer cavity of each reaction cavity is firstly extracted step by step and discharged from the unloading cavity, and then the reaction material in the material source is sequentially added into the primary reaction cavity and the secondary reaction cavity, and the added reaction material is located in the first outer cavity of each reaction cavity.

[0084] The present invention has at least the following beneficial effects:

[0085] 1. The reaction device of the present invention is provided with an air intake filter structure, and the exhaust gas can also be filtered after the reaction, thereby preventing the lithium chloride powder from being taken away from the reaction device. At the same time, the exhaust gas first enters the air intake filter structure and then enters the condenser, which can also improve the condensation effect of the exhaust gas. The reaction device of the present invention takes into account the filtering advantages of the exhaust gas before and after the reaction, thereby reducing the equipment cost for the enterprise.

[0086] 2. In the process of tail gas entering the reactor, the stirring structure arranged in the reactor can guide the tail gas and diffuse it in the reactor in the drainage position, thereby ensuring the reaction effect of the tail gas in the reactor;

[0087] 2.1 In the drainage position, the drainage surface of the stirring structure moves and changes the drainage direction of the drainage surface, so that the tail gas can be more easily diffused to different positions of the reactor;

[0088] 2.2 In the drainage posture, the movable body with the reaction chamber performs lifting and lowering activities. During the descending activity, the exhaust gas cooperates with different one-way air inlet nozzles on the outer wall of the movable body, and when the air intake pipe cooperates with different one-way air inlet nozzles, the exhaust gas can be sent into the reaction chamber from different positions. In the air intake process, with the continuous movement of the drainage surface in point 2.1, the exhaust gas can be diffused into the reaction chamber more easily.

[0089] 3. The stirring structure of the present invention can be driven to rotate during the lifting activity of the movable body, eliminating the need for a motor to drive the stirring structure to rotate. At the same time, the first unidirectional rotating structure and the second unidirectional rotating structure on the stirring structure can ensure that the stirring structure can only rotate in the same direction, thereby ensuring the stirring effect.

[0090] 4. In order to facilitate the feeding, the present invention is also provided with a feeding mechanism, which can feed the secondary reaction chamber and the primary reaction chamber step by step. More importantly, when feeding, the feeding mechanism of the present invention can send the reacted materials (Li CL and Li F) in the secondary reaction chamber into the primary reaction chamber and concentrate them in the primary reaction chamber, so that the Li CL in the secondary reaction chamber is fully used. The present invention is provided with the primary reaction chamber and the secondary reaction chamber to ensure the treatment of hydrofluoric acid in the tail gas;

[0091] 4.1 When adding materials, the flow guide is contracted, so that the newly added Li CL is concentrated on the periphery of the stirring structure. When the tail gas enters the reaction chamber, it can first contact and react with the newly added Li CL.

[0092] In addition, other advantages of the present invention will be shown in the embodiment of the present invention, thereby making the beneficial effects of the present invention more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0094] Figure 1 It is a schematic diagram of a system in a specific embodiment 1 of the present invention;

[0095] Figure 2 It is a structural schematic diagram of the reaction device in specific embodiment 1 of the present invention;

[0096] Figure 3 It is a schematic diagram of the structure of the reaction device in specific embodiment 2 of the present invention;

[0097] Figure 4 It is a schematic diagram of the structure of the moving body in the specific embodiment 2 of the present invention;

[0098] Figure 5 is a schematic diagram of a first unidirectional rotating structure in specific embodiment 2 of the present invention;

[0099] Figure 6 is a schematic diagram of a second unidirectional rotating structure in specific embodiment 2 of the present invention;

[0100] Figure 7 for Figure 4 AA section view in;

[0101] Figure 8 for Figure 4 Schematic diagram of another form;

[0102] Fig. 9 for Figure 8 Schematic diagram of another form;

[0103] Fig.10 It is a schematic diagram of the structure of the drive disk in the specific embodiment 2 of the present invention;

[0104] Fig.11 It is a schematic structural diagram of the feeding mechanism in specific embodiment 2 of the present invention. DETAILED DESCRIPTION

[0105] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0106] Example 1

[0107] like Figure 1-2 As shown, the present invention discloses a lithium hexafluorophosphate tail gas treatment system, which is characterized by comprising:

[0108] The condensation module is composed of a condenser 100 and a hydrogen fluoride receiving tank 101;

[0109] Reaction device 2, consisting of a reactor and an air intake filtering structure;

[0110] The lithium fluoride preparation kettle 102 receives the residual material discharged from the reactor 2;

[0111] Water washing tower 103;

[0112] Alkali washing tower 104;

[0113] The tail gas is processed by passing through the air intake filter structure, the condenser 100, the reactor 2, the water washing tower 103 and the alkali washing tower 104 in sequence;

[0114] The reactor has at least two reaction zones, each of which has an air inlet end and an exhaust end, and a stirring structure is arranged in each reaction zone.

[0115] In this embodiment, the reactor comprises:

[0116] The body 20 has a chamber;

[0117] At least two movable bodies 21 move in the main body 20 and divide the chamber into an air intake chamber 210 and a plurality of air exhaust chambers 211;

[0118] The reaction chamber is composed of a primary reaction chamber 221 and a secondary reaction chamber 222 formed in each movable body 21;

[0119] A connecting shaft 23, connecting adjacent movable bodies 21;

[0120] An exhaust port 24 is formed on the movable body 21 and connects the reaction chamber and the exhaust chamber 211;

[0121] A stirrer 25 is disposed in each reaction chamber.

[0122] In this embodiment: the air intake filter structure includes:

[0123] The filter screen 30 is disposed in the air inlet cavity and divides the air inlet cavity into a second inner cavity 30a and a second outer cavity 30b which are coaxially disposed;

[0124] The air inlet 31 is formed integrally with the movable body 21 and has a telescopic cavity 31a adapted to the filter 30;

[0125] An intake valve 32 is mounted on the body 20 and communicates with the second outer chamber 30b and allows exhaust gas to enter;

[0126] The exhaust valve 33 is installed on the body 20 and communicates with the second inner cavity 30a.

[0127] In this embodiment, the exhaust valve 33 is connected to the condenser 100 via a delivery pipe, and the outlet of the condenser 100 is connected to the primary reaction chamber 221 via a delivery pipe.

[0128] In this embodiment, a first gas outlet nozzle 20a (exhaust end) and a second gas outlet nozzle 20b (exhaust end) are also provided on the main body 20. The first gas outlet nozzle 20a is connected to the secondary reaction chamber 222 through a delivery pipe, and the second gas outlet nozzle 20b delivers the exhaust gas to the water washing tower 103 through the delivery pipe.

[0129] In this embodiment, the exhaust gas is delivered into the second outer chamber 30b through the delivery pipe and the intake valve.

[0130] In this embodiment, a delivery pipe is connected between the primary reaction chamber 221 and the secondary reaction chamber 222 and the lithium fluoride preparation kettle 102, and a material pump 223 is provided on the delivery pipe for delivering the reactants in the primary reaction chamber 221 and the secondary reaction chamber 222 into the lithium chloride preparation kettle 103.

[0131] In this embodiment, a one-way valve 224 is provided on each material pipe.

[0132] In this embodiment, the movable body is controlled by the hydraulic cylinder 26 to reciprocate in the main body 20 .

[0133] In this embodiment, Li CL powder is pre-added into the primary reaction chamber and the secondary reaction chamber, which can react with hydrogen fluoride.

[0134] refer to Figure 1-2 , the principle of this embodiment is:

[0135] Initial exhaust gas filtration: The hydraulic cylinder controls the movement of the movable body. When the movable body rises, negative pressure is formed in the air intake chamber, and the exhaust gas is sucked into the air intake chamber. When the movable body descends, the exhaust gas in the air intake chamber is squeezed out. In the process of the exhaust gas being squeezed out of the air intake chamber, the particle impurities are filtered by the filter;

[0136] Tail gas condensation: The tail gas discharged from the air inlet cavity (the second inner cavity) enters the condenser for condensation. Most of the hydrogen fluoride gas is cooled and condensed in the condenser and recovered into the hydrogen fluoride receiving tank;

[0137] Removal of hydrogen fluoride from tail gas: The condensed tail gas (mainly composed of HCL and a trace amount of HF) is sent to the primary reaction chamber for a primary reaction, and is discharged from the exhaust port of the primary reaction chamber after the reaction, and is sent to the secondary reaction chamber from the first outlet nozzle for a secondary reaction to ensure the elimination of HF in the tail gas. After the tail gas is discharged from the secondary reaction chamber, it is sent to the water scrubber from the second outlet nozzle;

[0138] Removal of hydrogen chloride from tail gas: The tail gas discharged from the secondary reaction chamber passes through a water scrubber and an alkali scrubber in sequence to remove hydrogen chloride, and is discharged after the tail gas meets the standards.

[0139] In this embodiment, the tail gas undergoes two reaction treatments in the primary reaction chamber and the secondary reaction chamber, so that most of the HF gas in the tail gas can be removed. According to actual applications, multiple reaction chambers such as a tertiary reaction chamber and a quaternary reaction chamber can also be set to ensure the removal of HF gas.

[0140] Secondly, the reaction device of this embodiment is provided with an air intake filter structure, and the air intake filter structure can not only filter the exhaust gas, but also guide the exhaust gas into the air intake cavity, thereby eliminating the fan structure for transporting the exhaust gas, and the filtered exhaust gas is further condensed, which can improve the condensation effect.

[0141] In addition, after the reaction is completed, the hydraulic cylinder stops and the tail gas is stopped from being transported. At this time, the reactants in the primary reaction chamber and the secondary reaction chamber can be sent to the lithium fluoride preparation kettle for recycling.

[0142] Embodiment 2 is different from Embodiment 1 in that:

[0143] like Figure 3-11 As shown, in this embodiment, the stirring structure has at least a closed position, a filtering position and a drainage position when being controlled to move;

[0144] In the closed position, the stirring structure closes the exhaust end of the reaction zone;

[0145] In the filtering position, the stirring structure opens the exhaust end of the reaction zone and forms a filtering layer at the exhaust end of the reaction zone;

[0146] In the drainage position, the stirring structure forms a drainage surface that can be continuously moved, and the drainage surface can disperse and / or guide the movement of the exhaust gas entering from the intake end.

[0147] In this embodiment, a plurality of recessed areas 40 are formed on the side wall of the movable body 21 and can be controlled by the first driver (hydraulic cylinder) to move up and down in the chamber, and a one-way air inlet nozzle 41 connected to the reaction chamber is installed in each recessed area 40, and an air inlet pipe 42 (air inlet end) is provided on the main body 20, which can be connected between each one-way air inlet nozzle 41 and the condenser 100 or between each one-way air inlet nozzle 41 and the exhaust chamber 211.

[0148] In this embodiment, the stirring structure includes:

[0149] The driving shaft 50 is rotatably mounted on the movable body 21, and its two ends are respectively located outside the reaction chamber and inside the reaction chamber;

[0150] A stirring shaft 51 connected to the driving shaft 50;

[0151] A stirring blade 52 is installed on the stirring shaft 51 and is located inside the reaction chamber;

[0152] The screw 53 is mounted on the driving shaft 50 and is located outside the reaction chamber;

[0153] The limiting plate 54 is installed in the cavity of the body 20 and has a movable opening for the screw rod 53 to pass through;

[0154] The nut 55 is installed at the movable opening and cooperates with the screw rod 53;

[0155] The first unidirectional rotating structure 55 and the second unidirectional rotating structure 56 are respectively provided at the matching position of the driving shaft 50 and the stirring shaft 51 and the matching position of the stirring shaft 51 and the reaction chamber;

[0156] When the screw 53 rotates forward (when the screw descends, it cooperates with the nut and is driven to rotate forward), the driving shaft 50 drives the stirring shaft 51 to rotate forward through the first unidirectional rotating structure 56;

[0157] When the screw 53 reverses (when the screw rises, it cooperates with the nut and is driven to reverse), the stirring shaft 51 is prevented from reversing by the second unidirectional rotation structure 55 .

[0158] In this embodiment, the first one-way rotating structure 55 and the second one-way rotating structure 56 both include:

[0159] The inner shaft 60 has a plurality of grooves 61 on its circumferential outer side wall;

[0160] The outer sleeve 62 is coaxially arranged with the inner shaft 60, and a plurality of limiting grooves 620 are formed on the inner side wall of the outer sleeve 62;

[0161] A limiting block 63 cooperating with the limiting groove 620 is rotatably connected in the groove 61 , and a limiting spring 64 is provided between the limiting block 63 and the groove 61 .

[0162] In this embodiment, the inner shaft 60 of the first unidirectional rotating structure 55 is connected to the driving shaft 50, and the outer shaft sleeve 62 of the first unidirectional rotating structure 55 is connected to the stirring shaft 51;

[0163] The inner shaft 60 of the second unidirectional rotating structure 56 is connected to the stirring shaft 51 , and the outer shaft sleeve 62 of the second unidirectional rotating structure 56 is fixedly disposed on the inner wall of the reaction chamber.

[0164] In this embodiment, a drainage structure controlled by a driving shaft is provided in the reaction chamber, and the drainage structure includes:

[0165] The drainage body 70 is rotatably connected to the inner wall of the reaction chamber via a rotating shaft 71, and the circumferential outer wall of the drainage body forms a drainage surface 70a;

[0166] The driving plate 72 is connected to the driving shaft 50 and has a plurality of limiting openings 72c for the rotation shaft 71 to move;

[0167] The connecting rod 73 has two ends hingedly connected to the drainage body 70 and the driving disk 72 respectively;

[0168] The slide rail 72a is disposed on the driving plate 72 and has an inclined guide rail surface 72b;

[0169] The exhaust port 24 is slidably connected with a filter element 74, and the filter element 74 abuts against the slide rail 72a through a supporting structure;

[0170] When the driving shaft 50 rotates forward, the drainage body 70 is spread out based on the stirring shaft 51 and the drainage direction of the drainage surface 70a is adjusted;

[0171] When the driving shaft 50 rotates reversely, the guide body 70 is retracted with respect to the stirring shaft 51 , and the reaction chamber is divided into a first inner chamber 81 and a first outer chamber 82 which are spaced apart from each other and arranged coaxially.

[0172] In this embodiment, the support structure includes:

[0173] A sealing plate 83 connected to the filter element 74;

[0174] A support shaft 84 connected to the sealing plate 83 and having one end abutting against the slide rail 72a;

[0175] A universal ball 85 is provided on the mating surface between the support shaft 84 and the slide rail 72a (in other embodiments, the universal ball may not be used, and one end of the support shaft may be slidably connected to the slide rail).

[0176] In this embodiment: a feeding mechanism is also included, and the feeding mechanism includes:

[0177] Source 90;

[0178] The feeding body 91 has a primary feeding chamber 91a, a secondary feeding chamber 91b and a discharge chamber 91c;

[0179] The piston body is composed of a first piston body 921 movable in the primary feeding chamber 91a and the secondary feeding chamber 91b, and a second piston body 922 movable in the discharge chamber 91c;

[0180] A piston shaft 93 is connected between each first piston body 921, and a piston shaft 93 is also provided between the first piston body 921 and the second piston body 922, and the piston shaft between the first piston body 921 and the second piston body 922 can contact or separate with the second piston body 922, and each piston body is controlled to move by the second driver 94 through the piston shaft;

[0181] A return spring 95 is installed in the discharge chamber 91c and one end of the return spring 95 abuts against the second piston body 922;

[0182] A plurality of feed check valves 96 are installed on the feeding body 91 and are connected to the primary feeding chamber 91a, the secondary feeding chamber 91b and the discharge chamber 91c;

[0183] A plurality of discharge one-way valves 97 are installed on the feeding body 91 and are connected to the primary feeding chamber 91a, the secondary feeding chamber 91b and the discharge chamber 91c;

[0184] The material pipe is composed of a first pipe body 981 connecting the material source 90 and the primary feeding chamber 91a, a second pipe body 982 connecting the primary feeding chamber 91a and the secondary reaction chamber 222, a third pipe body 983 connecting the secondary reaction chamber 222 and the secondary feeding chamber 91b, a fourth pipe body 984 connecting the secondary feeding chamber 91b and the primary reaction chamber 221, and a fifth pipe body 985 connecting the primary reaction chamber 221 and the discharge chamber 91c;

[0185] Among them, the material source 90, the first-level feeding chamber 91a, the second-level reaction chamber 222, the second-level feeding chamber 91b, the first-level reaction chamber 221 and the unloading chamber 91c are connected by the feed check valve 96, the discharge check valve 97 and the material pipe to form a one-way feeding branch that can feed material layer by layer.

[0186] In addition, the method for treating tail gas of lithium hexafluorophosphate in this embodiment comprises the following steps under the basis that the first driver controls the reciprocating lifting and lowering activities of each movable body:

[0187] S1: When the moving body rises and forms a negative pressure in the air intake chamber, exhaust gas is introduced into the air intake chamber for filtration, and when the moving body descends, the filtered exhaust gas in the air intake chamber is squeezed out and sent to the condenser;

[0188] S2: The tail gas is cooled and condensed in the condenser, and the condensed hydrogen fluoride gas in the tail gas enters the hydrogen fluoride receiving tank to obtain the first-level tail gas;

[0189] S3: The primary tail gas obtained in step S2 enters the reaction chamber from each one-way air inlet nozzle when the movable body descends, and enters the exhaust chamber from the exhaust port after reacting in the reaction chamber, and is further sent to another movable reaction chamber for secondary reaction, and then obtains the secondary tail gas;

[0190] S4: The secondary tail gas in step S3 is sent to a water scrubber and an alkali scrubber in sequence to remove hydrogen chloride gas and is discharged after meeting the standards, thus completing the tail gas treatment.

[0191] It further includes a feeding method before step 1, an airflow guiding method in step S3, and a feeding method in any step from step S1 to step S5;

[0192] Wherein, the feeding method comprises:

[0193] When adding materials, the second driver is started for the first time, and controls the first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, and draws the reaction material in the material source into the primary feeding chamber, and as the first piston shaft moves, the reaction material in the primary feeding chamber is squeezed out and sent into the secondary reaction chamber;

[0194] After the reaction material is added to the secondary reaction chamber, the second driver is started again, and controls each first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, so that the reaction material in the secondary reaction chamber is drawn into the secondary feeding chamber, and the reaction material in the material source is drawn into the primary feeding chamber again, and along with the movement of the first piston shaft, the reaction material in the primary feeding chamber and the secondary feeding chamber is respectively sent into the secondary reaction chamber and the primary reaction chamber to complete the feeding;

[0195] The airflow guiding method comprises:

[0196] During the lifting process of the movable body, the one-way air inlet nozzles on the movable body are respectively connected with the air inlet pipes, and the exhaust gas entering the reaction chamber from the air inlet pipes is sent into the reaction chamber from different positions;

[0197] When the tail gas enters the reaction chamber, the guide body is controlled to expand by the driving disk, and the guide surface of the guide body is used to guide the tail gas to disperse and flow in the reaction chamber;

[0198] The feeding method comprises:

[0199] When feeding, the drainage body is controlled by the driving disk to be retracted, and a first inner cavity and a first outer cavity are formed in the reaction cavity;

[0200] When the second driver controls the first piston body and the second piston body to move back and forth, the reaction material in the first outer cavity of each reaction cavity is firstly extracted step by step and discharged from the unloading cavity, and then the reaction material in the material source is sequentially added into the primary reaction cavity and the secondary reaction cavity, and the added reaction material is located in the first outer cavity of each reaction cavity.

[0201] refer to Figure 3-11 This embodiment has at least the following differences (or advantages) from Embodiment 1:

[0202] 1. The driving motor of the stirring structure is eliminated;

[0203] 2. Allow tail gas to enter the reaction chamber in multiple directions:

[0204] 3. When replenishing the material, the replenished Li CL is located at the periphery of the reaction chamber (in the first outer chamber), so that the tail gas entering the reaction chamber can contact this part of the reaction material, thereby ensuring the treatment effect of the tail gas.

[0205] In more detail:

[0206] Operation principle of the stirring structure: When the movable body of the present embodiment is controlled to rise and fall, the screw passes through the nut and is driven to rotate by the nut. When the screw descends and rotates forward (clockwise), the drive shaft is driven to rotate forward. Due to the first unidirectional rotation structure set between the drive shaft and the stirring shaft, when the drive shaft rotates clockwise, the stirring shaft can be driven to rotate clockwise and stir the material in the reaction chamber to promote the reaction efficiency and effect in the reaction chamber. When the screw rises and reverses (counterclockwise), the drive is driven to reverse by the shaft. Due to the second unidirectional rotation structure set between the stirring shaft and the reaction chamber, when the stirring shaft reverses, it will be restricted by the outer sleeve of the second unidirectional rotation structure, so that when the drive shaft drives the inner shaft of the first unidirectional rotation structure to rotate, the inner shaft of the first unidirectional rotation structure will rotate relative to the outer sleeve of the first unidirectional rotation structure (which is connected to the stirring shaft and therefore will not reverse). Therefore, the stirring shaft will not reverse, thereby ensuring that the stirring work can operate stably.

[0207] The principle of the one-way rotation structure: when the inner shaft rotates, if the upper limit block of the inner shaft abuts against the limit groove of the outer sleeve, the inner shaft will be blocked by the outer sleeve when rotating; if the limit block on the inner shaft can squeeze the limit spring and make the limit block shrink into the groove when the inner shaft rotates, the inner shaft can rotate in the outer sleeve.

[0208] Drainage principle (drainage posture): When the exhaust gas in the condenser is discharged and transported to the reaction chamber by the intake pipe, when the intake pipe is connected with the one-way intake nozzle on the movable body, the exhaust gas can enter the reaction chamber of the movable body through the one-way intake nozzle. Therefore, during the descent of the movable body, the exhaust gas can enter the reaction chamber from different one-way intake nozzles, so that the exhaust gas can be dispersed at various positions in the reaction chamber, thereby improving the reaction efficiency;

[0209] Moreover, during the descent of the movable body, the drive shaft drives the drive disc to rotate. Figure 7-9 When the driving disk rotates, the connecting rod is used to control the dispersion of each drainage body. In this process, the exhaust gas enters the reaction chamber through different one-way air inlet nozzles. That is to say, the exhaust gas flows radially from the one-way air inlet nozzle toward the center of the reaction chamber. When the exhaust gas passes through the drainage surface of the drainage body, it is guided by the drainage body and changes the flow direction of the exhaust gas, so that the exhaust gas is quickly dispersed in the reaction chamber.

[0210] More importantly: during the descent of the moving body, the drainage body is gradually opened, so the drainage surface on the drainage body will continue to move, so the drainage direction of the drainage body will be constantly changed, so that the exhaust gas can be dispersed more quickly.

[0211] It is worth mentioning that: that is, during the descent of the movable body, the driving disk rotates, causing the high point of the supporting shaft slide to move to the low point of the slide, thereby opening the exhaust port, and the exhaust gas in the reaction chamber can be discharged from the filter element of the exhaust port (filtering posture) and enter the next reaction chamber or be transported to the water washing tower.

[0212] Feeding principle (closed position, so that the exhaust port of the reaction chamber is closed, that is, the support structure moves on the slide rail and makes the sealing plate close the exhaust port to prevent the gas in the exhaust chamber from flowing back into the reaction chamber during feeding):

[0213] When feeding, the drive shaft rises and controls the drive disk to drive the drainage body to shrink, and divides the reaction chamber into two chambers separated by inner and outer chambers. When the second driver (such as a hydraulic cylinder) of the feeding mechanism is started, the piston body moves in the feeding chamber, and when negative pressure is formed in the feeding chamber, the material is extracted. When the piston body is reset, the reaction material in the feeding chamber is squeezed out and sent into the reaction chamber to complete the layer-by-layer feeding. Specifically:

[0214] When extracting materials, the primary feeding chamber can extract the reaction materials in the material source (such as the storage tank of the reaction materials), and at the same time, the secondary feeding chamber extracts the reaction materials in the outer chamber of the secondary reaction chamber;

[0215] During feeding, the primary feeding chamber feeds the reaction material into the outer chamber of the secondary feeding chamber, and the secondary feeding chamber feeds the reaction material into the outer chamber of the primary reaction chamber. This feeding method can improve the utilization effect of the reaction material in the secondary reaction chamber because, in the tail gas recovery process, most of the tail gas is processed in the primary reaction chamber, and the reaction material in the secondary reaction chamber will not be consumed excessively when used. Therefore, in order to avoid waste, the feeding method of this embodiment is used to feed the reaction material in the secondary reaction chamber into the primary reaction chamber for utilization, and the reaction material originally in the primary reaction chamber can be discharged from the reactor when the second piston body in the discharge chamber moves;

[0216] In the above process, the reaction materials can be placed outside the guide body when added into the reaction chamber, so that the tail gas can contact with the reaction materials first when entering the reaction chamber, thereby ensuring the reaction effect.

[0217] During unloading, the second driver controls the piston shaft of the first piston body to contact the second piston body, and controls the return spring to drive the second piston body to move back and forth in the unloading chamber, thereby discharging the reaction material in the primary reaction chamber and completing the unloading. This part of the reaction material can be sent to the lithium chloride preparation kettle.

[0218] Some nouns in this embodiment are shown as follows:

[0219] Layer-by-layer replenishment refers to replenishing materials to the secondary reaction chamber and the primary reaction chamber in sequence, and the above-mentioned replenishment principle can also be referred to.

[0220] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium hexafluorophosphate tail gas treatment system, characterized in that: include: A condensation module, comprising a condenser (100) and a hydrogen fluoride receiving tank (101); A reaction device (2), comprising a reactor and an air intake filter structure; A lithium fluoride preparation kettle (102) receives the residual material discharged from the reactor (2); Water washing tower (103); Alkali washing tower (104); The tail gas is processed by passing through an air intake filter structure, a condenser (100), a reactor (2), a water washing tower (103) and an alkali washing tower (104) in sequence; The reactor has at least two reaction zones, each of which has an air inlet end and an exhaust end, and a stirring structure is provided in each reaction zone, and the stirring structure has at least a closed position, a filtering position and a drainage position when being controlled to move; In the closed position, the stirring structure closes the exhaust end of the reaction zone; In the filtering position, the stirring structure opens the exhaust end of the reaction zone and forms a filtering layer at the exhaust end of the reaction zone; In the drainage position, the stirring structure forms a drainage surface that can be continuously moved, and the drainage surface can disperse and / or guide the movement of the exhaust gas entering from the intake end; The reactor comprises: A body (20) having a chamber; At least two movable bodies (21), the movable bodies (21) being capable of being controlled by a first driver to move up and down in the chamber, and dividing the chamber into an air intake chamber (210) and a plurality of air exhaust chambers (211); A reaction chamber, consisting of a primary reaction chamber (221) and a secondary reaction chamber (222) formed in each movable body (21); A connecting shaft (23) connecting adjacent movable bodies (21); An exhaust port (24) is formed on the movable body (21) and communicates with the reaction chamber and the exhaust chamber (211); The stirring structure comprises: A driving shaft (50) is rotatably mounted on the movable body (21), with two ends thereof being located outside the reaction chamber and inside the reaction chamber respectively; A stirring shaft (51) connected to a driving shaft (50); A screw (53) is mounted on the driving shaft (50) and is located outside the reaction chamber; A limit plate (54) is installed in the cavity of the body (20) and has a movable opening for the screw rod (53) to pass through; A nut (55) is installed at the movable opening and cooperates with the screw (53); The reaction chamber is provided with a drainage structure controlled by a driving shaft, and the drainage structure comprises: A drainage body (70) is rotatably connected to the inner wall of the reaction chamber via a rotating shaft (71), and a circumferential outer wall of the drainage body forms a drainage surface (70a); A driving disk (72) connected to the driving shaft (50) and having a plurality of limiting openings (72c) for the rotation shaft (71) to move; A connecting rod (73), both ends of which are respectively hinged to the drainage body (70) and the driving disk (72); A slide rail (72a) is disposed on the driving disk (72) and has an inclined guide rail surface (72b); A filter element (74) is slidably connected to the exhaust port (24), and the filter element is abutted against the slide rail (72a) via a supporting structure.

2. A lithium hexafluorophosphate tail gas treatment system according to claim 1, characterized in that: A plurality of recessed areas (40) are formed on the side wall of the movable body (21), and a one-way air inlet nozzle (41) connected to the reaction chamber is installed in each recessed area (40), and an air inlet pipe (42) capable of connecting between each one-way air inlet nozzle (41) and the condenser (100) or between each one-way air inlet nozzle (41) and the exhaust chamber (211) is provided on the main body (20).

3. A lithium hexafluorophosphate tail gas treatment system according to claim 2, characterized in that: The stirring structure also includes: A stirring blade (52) is mounted on the stirring shaft (51) and is located inside the reaction chamber; Wherein, the matching position between the driving shaft (50) and the stirring shaft (51) and the matching position between the stirring shaft (51) and the reaction chamber are respectively provided with a first unidirectional rotating structure (55) and a second unidirectional rotating structure (56); When the screw (53) rotates forward, the driving shaft (50) drives the stirring shaft (51) to rotate forward via the first unidirectional rotating structure (55); When the screw (53) rotates in the reverse direction, the stirring shaft (51) is prevented from rotating in the reverse direction by the second unidirectional rotation structure (56).

4. A lithium hexafluorophosphate tail gas treatment system according to claim 3, characterized in that: The first one-way rotating structure (55) and the second one-way rotating structure (56) both include: The inner shaft (60) has a plurality of grooves (61) on its circumferential outer wall; An outer shaft sleeve (62) is coaxially arranged with the inner shaft (60), and a plurality of limiting grooves (620) are formed on the inner side wall of the outer shaft sleeve (62); A limiting block (63) that cooperates with the limiting groove (620) is rotatably connected in the groove (61), and a limiting spring (64) is provided between the limiting block (63) and the groove (61).

5. A lithium hexafluorophosphate tail gas treatment system according to claim 3 or 4, characterized in that: When the driving shaft (50) rotates forward, the drainage body (70) is expanded with the stirring shaft (51) as the reference, and the drainage direction of the drainage surface (70a) is adjusted; When the driving shaft (50) rotates in the reverse direction, the guide body (70) is retracted with respect to the stirring shaft (51), and the reaction chamber is divided into a first inner chamber (81) and a first outer chamber (82) which are spaced apart from each other and arranged coaxially.

6. A lithium hexafluorophosphate tail gas treatment system according to claim 5, characterized in that: The support structure comprises: A sealing plate (83) connected to the filter element (74); A support shaft (84) connected to the sealing plate (83) and having one end abutting against the slide rail (72a); Wherein, a universal ball (85) is provided on the matching surface between the support shaft (84) and the slide rail (72a).

7. A lithium hexafluorophosphate tail gas treatment system according to claim 5, characterized in that: It also includes a feeding mechanism, which includes: Source (90); A feeding body (91) having a primary feeding chamber (91a), a secondary feeding chamber (91b) and a discharge chamber (91c); The piston body is composed of a first piston body (921) movable in the primary feeding chamber (91a) and the secondary feeding chamber (91b), and a second piston body (922) movable in the discharge chamber (91c); A piston shaft (93) connected to each of the first piston bodies (921) and controlled to move by a second driver (94); A return spring (95) is installed in the discharge chamber (91c) and has one end abutting against the second piston body (922); A plurality of feed check valves (96) are installed on the feed body (91) and are in communication with the primary feed chamber (91a), the secondary feed chamber (91b) and the discharge chamber (91c); A plurality of discharge one-way valves (97) are installed on the feeding body (91) and are in communication with the primary feeding chamber (91a), the secondary feeding chamber (91b) and the discharge chamber (91c); The material pipe is composed of a first tube body (981) connected between a material source (90) and a primary feeding chamber (91a), a second tube body (982) connected between the primary feeding chamber (91a) and a secondary reaction chamber (222), a third tube body (983) connected between the secondary reaction chamber (222) and the secondary feeding chamber (91b), a fourth tube body (984) connected between the secondary feeding chamber (91b) and the primary reaction chamber (221), and a fifth tube body (985) connected between the primary reaction chamber (221) and the discharge chamber (91c); Among them, a one-way feeding branch capable of feeding layer by layer is formed by the feed check valve (96), the discharge check valve (97) and the material pipe between the material source (90), the first-level feeding chamber (91a), the second-level reaction chamber (222), the second-level feeding chamber (91b), the first-level reaction chamber (221) and the discharge chamber (91c).

8. A lithium hexafluorophosphate tail gas treatment system according to any one of claims 2 to 4, characterized in that: The air intake filter structure comprises: The filter screen (30) is arranged in the air intake cavity and divides the air intake cavity into a second inner cavity (30a) and a second outer cavity (30b) which are arranged coaxially; An air inlet (31) is integrally formed with the movable body (21) and has a telescopic cavity (31a) adapted to the filter screen (30); An intake valve (32) is mounted on the body (20) and communicates with the second outer chamber (30b) and allows exhaust gas to enter; An exhaust valve (33) is mounted on the body (20) and is in communication with the second inner cavity (30a).

9. A method for treating tail gas of lithium hexafluorophosphate, using the tail gas treatment system as claimed in claim 7, characterized in that: The first driver controls the reciprocating lifting movement of each movable body, and the following steps are included: S1: When the moving body rises and forms a negative pressure in the air intake chamber, exhaust gas is introduced into the air intake chamber for filtration, and when the moving body descends, the filtered exhaust gas in the air intake chamber is squeezed out and sent to the condenser; S2: The tail gas is cooled and condensed in the condenser, and the condensed hydrogen fluoride gas in the tail gas enters the hydrogen fluoride receiving tank to obtain the first-level tail gas; S3: The primary tail gas obtained in step S2 enters the reaction chamber from each one-way air inlet nozzle when the movable body descends, and enters the exhaust chamber from the exhaust port after reacting in the reaction chamber, and is further sent to another movable reaction chamber for secondary reaction, and then obtains the secondary tail gas; S4: The secondary tail gas in step S3 is sent to a water scrubber and an alkali scrubber in sequence to remove hydrogen chloride gas and is discharged after meeting the standards, thus completing the tail gas treatment.

10. A method for treating lithium hexafluorophosphate tail gas according to claim 9, characterized in that: It also includes a feeding method before step 1, an airflow guiding method in step S3, and a feeding method in any step from step S1 to step S5; Wherein, the feeding method comprises: When adding materials, the second driver is started for the first time, and controls the first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, and draws the reaction material in the material source into the primary feeding chamber, and as the first piston shaft moves, the reaction material in the primary feeding chamber is squeezed out and sent into the secondary reaction chamber; After the reaction material is added to the secondary reaction chamber, the second driver is started again, and controls each first piston shaft to move in the primary feeding chamber and the secondary feeding chamber, so that the reaction material in the secondary reaction chamber is drawn into the secondary feeding chamber, and the reaction material in the material source is drawn into the primary feeding chamber again, and along with the movement of the first piston shaft, the reaction material in the primary feeding chamber and the secondary feeding chamber is respectively sent into the secondary reaction chamber and the primary reaction chamber to complete the feeding; The airflow guiding method comprises: During the lifting process of the movable body, the one-way air inlet nozzles on the movable body are respectively connected with the air inlet pipes, and the exhaust gas entering the reaction chamber from the air inlet pipes is sent into the reaction chamber from different positions; When the tail gas enters the reaction chamber, the guide body is controlled to expand by the driving disk, and the guide surface of the guide body is used to guide the tail gas to disperse and flow in the reaction chamber; The feeding method comprises: When feeding, the drainage body is controlled by the driving disk to be retracted, and a first inner cavity and a first outer cavity are formed in the reaction cavity; When the second driver controls the first piston body and the second piston body to move back and forth, the reaction material in the first outer cavity of each reaction cavity is firstly extracted step by step and discharged from the unloading cavity, and then the reaction material in the material source is sequentially added into the primary reaction cavity and the secondary reaction cavity, and the added reaction material is located in the first outer cavity of each reaction cavity.

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