Nitrogen refining and stirring device for RDX acid removal

Abstract

The invention discloses a nitrogen refining and stirring device for RDX acid removal, which comprises a reaction kettle, a heating device, a filter screen, a discharge valve and a power device, the heating device is arranged in the reaction kettle, the filter screen is arranged at the bottom in the reaction kettle, the discharge valve and the power device are respectively arranged at the top and the bottom of the reaction kettle, and the discharge valve is connected with the power device. A refining stirring device and a nitrogen refining device are further arranged in the reaction kettle, the refining stirring device is in transmission connection with the power device, and the nitrogen refining device is mounted on the inner wall of the reaction kettle and matched with the refining stirring device; the nitrogen refining and stirring device for RDX acid displacement is novel in structure, convenient and practical, introduced nitrogen is micronized through the vortex shearing action formed by the stirring paddle, the nitrogen forms microbubbles with the controllable particle size in a liquid phase, the cavitation effect is triggered, and the acid displacement effect under the low-pressure or normal-pressure condition is achieved.

Description

Technical Field

[0001] This invention belongs to the field of RDX acid removal technology, specifically relating to a nitrogen-based agitation device for RDX acid removal. Background Technology

[0002] Currently, the acid removal process for RDX generally employs high-temperature, high-pressure boiling, relying on random steam bubbles generated during boiling and liquid convection to drive the diffusion and migration of acidic impurities. However, this method still has significant drawbacks in actual production: acid inside the crystal and in the micropores at grain boundaries is difficult to completely remove, resulting in long acid removal cycles and low mass transfer efficiency; abnormal floating and redeposition of particles due to bubble adhesion during boiling creates dead zones in the local flow field and causes uneven acid removal; at the same time, high-temperature, high-pressure operation leads to complex equipment, high energy consumption, and process safety risks. Although there are already enhancement methods such as ultrasonic, microwave, and pressurized washing, they all have limitations such as crystal damage, local overheating, or high equipment costs. Therefore, there is an urgent need for an acid removal enhancement technology and equipment that can achieve controllable bubble generation, stable flow field, and rapid mass transfer to solve the key bottlenecks of the traditional process of "long time, high pressure, high consumption, and instability," and improve the purity and safety performance of RDX products. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a nitrogen agitation device for acid removal in RDX. The device has a novel structure and is convenient and practical. It uses the vortex shearing effect formed by the agitator to agitate the introduced nitrogen gas, so that the nitrogen gas forms microbubbles with controllable particle size in the liquid phase and triggers the cavitation effect, thereby achieving acid removal effect under low pressure or normal pressure conditions.

[0004] A nitrogen agitation device for RDX acid removal includes a reaction vessel, a heating device, a filter screen, a discharge valve, and a power unit. The heating device is located inside the reaction vessel, the filter screen is located at the bottom of the reaction vessel, the discharge valve and the power unit are located at the top and bottom of the reaction vessel, respectively. The reaction vessel also includes an agitation device and a nitrogen agitation device. The agitation device is connected to the power unit, and the nitrogen agitation device is installed on the inner wall of the reaction vessel and works in conjunction with the agitation device.

[0005] Furthermore, the refining and stirring device includes a stirring shaft, a stirring rod, an internal gas cavitation device, stirring blades, and an external gas cavitation device. One end of the stirring shaft is connected to a power device for transmission, and the other end is connected to the stirring rod. The internal gas cavitation device, stirring blades, and external gas cavitation device are connected to the stirring shaft. The internal gas cavitation device is installed inside the nitrogen refining device and cooperates with it.

[0006] Furthermore, the nitrogen refining device includes an annular gas collecting shell, an annular gas venting plate, an annular large bubble concentrating shell, an annular side screen, an annular arc-shaped dispersing net, and an annular horizontal plate. The annular gas venting plate is connected between the annular gas collecting shell and the annular large bubble concentrating shell. One side of the annular side screen is connected to the outside of the annular large bubble concentrating shell, and the other side of the annular side screen is connected to the annular horizontal plate through the annular arc-shaped dispersing net. The annular gas venting plate has several conical holes.

[0007] Furthermore, both the internal gas cavitation device and the external gas cavitation device include a turntable and a gas refining device, with several gas refining devices connected to the turntable; several horn-shaped liquid inlet pipes and guide plates are respectively connected to the upper and lower sides of the turntable of the internal gas cavitation device, and a retaining ring connected to the horn-shaped liquid inlet pipe is provided on the upper side of the turntable.

[0008] Furthermore, the gas refining device includes a horn-shaped liquid inlet shell and a refining device, wherein the refining device is connected to one end of the horn-shaped liquid inlet shell with a small opening; the refining device includes an inner plate, an end plate and a spiral refining device, wherein a plurality of spiral refining devices are connected between the inner plate and the end plate.

[0009] Furthermore, the spiral refining device includes a sealing plate, a connecting pipe, a flexible hose, a positioning plate, and a nut. One end of the connecting pipe is connected to the sealing plate, and the other end passes through the positioning plate and is connected to the nut. Several flexible hoses are arranged around the connecting pipe, and their two ends are respectively connected to the sealing plate and the positioning plate. The sealing plate and the positioning plate have holes for communicating with the flexible hoses.

[0010] Furthermore, the hose is spirally arranged.

[0011] Furthermore, the inner plate and the end plate are provided with a number of fine holes. Beneficial effects

[0012] (1) The present invention provides a nitrogen agitation device for RDX acid removal, which has a novel structure and is convenient and practical. It utilizes the vortex shearing effect formed by the agitator to agitate the introduced nitrogen gas, so that the nitrogen gas forms microbubbles with controllable particle size in the liquid phase and triggers the cavitation effect, thereby achieving acid removal effect under low pressure or normal pressure conditions.

[0013] (2) The present invention provides a nitrogen agitation device for RDX acid removal, which refines the gas introduced into the funnel-shaped liquid inlet shell through the agitation device, thereby refining the nitrogen in the large bubble state to improve the cavitation effect of the agitator for acid removal.

[0014] (3) The present invention provides a nitrogen refining and stirring device for RDX acid removal, which uses a spiral refining device to make the bubbles and liquid form a spiral flow, so as to refine the bubbles and disperse them quickly in a spiral flow manner, thereby avoiding the bubbles from re-colliding to form large bubbles and ensuring the state after nitrogen refining. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the acid removal reactor. Figure 2 To provide a more detailed structural diagram of the stirring device; Figure 3 This is a schematic diagram of the internal gas cavitation device; Figure 4 This is a schematic diagram of the nitrogen refining device; Figure 5 This is a top view of the internal gas cavitation device; Figure 6 This is a side view of the internal gas cavitation device; Figure 7 This is a schematic diagram of the gas refining device; Figure 8 This is a detailed structural diagram of the device; 1-Reaction vessel, 2-Heating device, 3-Filter screen, 4-Discharge valve, 5-Power unit, 6-Refining and stirring device, 7-Stirring shaft, 8-Stirring rod, 9-Nitrogen refining device, 91-Annular gas collecting shell, 92-Annular gas outlet plate, 93-Annular large bubble collecting shell, 94-Annular side screen, 95-Annular arc-shaped dispersing net, 96-Annular horizontal plate, 97-Conical hole, 10-Internal gas cavitation device, 110-Rotating disc, 1 11-Flare-shaped liquid inlet pipe, 112-Guide inclined plate, 113-Baffle ring, 114-Gas atomizing device, 115-Flare-shaped liquid inlet shell, 116-Atomizing device, 117-Inner plate, 118-End plate, 119-Atomizing hole, 120-Spiral atomizing device, 121-Sealing plate, 122-Connecting pipe, 123-Hose, 124-Positioning plate, 125-Nut, 11-Stirring blade, 12-External gas cavitation device. Detailed Implementation

[0016] The embodiments of the present invention will be further described below with reference to the accompanying drawings. Example

[0017] like Figures 1 to 7 As shown; a nitrogen agitation device for RDX acid removal includes a reaction vessel 1, a heating device 2, a filter screen 3, a discharge valve 4, and a power unit 5. The heating device 2 is located inside the reaction vessel 1, the filter screen 3 is located at the bottom inside the reaction vessel 1, the discharge valve 4 and the power unit 5 are respectively located at the top and bottom of the reaction vessel 1. The reaction vessel 1 is also equipped with a agitation device 6 and a nitrogen agitation device 9. The agitation device 6 is connected to the power unit 5, and the nitrogen agitation device 9 is installed on the inner wall of the reaction vessel 1 and cooperates with the agitation device 6.

[0018] The nitrogen refining device 9 is connected to a nitrogen supply device to provide nitrogen. The reactor, 1, heating device 2, filter 3, discharge valve 4, and power device 5 are all existing technologies and will not be described in detail here. Specifically, nitrogen is introduced into the liquid through the nitrogen refining device 9 for preliminary refining. At the same time, the power device 5 drives the refining stirring device 6 to stir the liquid and refine the nitrogen bubbles. During stirring, the refining stirring device 6 generates a cavitation effect with the nitrogen bubbles. The cavitation effect is used to remove the acid attached to the RDX crystals inside and in the micropores of the grain boundaries. The acid is driven away from the RDX crystals by cavitation enhancement. The process safety risk in the explosion-sensitive environment is reduced by replacing air with inert nitrogen, and the device is operated at low or normal pressure throughout the process, reducing energy consumption and waste acid emissions.

[0019] In another embodiment of the present invention, the refining and stirring device 6 includes a stirring shaft 7, a stirring rod 8, an internal gas cavitation device 10, a stirring blade 11, and an external gas cavitation device 12. One end of the stirring shaft 7 is connected to the power device 5 and the other end is connected to the stirring rod 8. The internal gas cavitation device 10, the stirring blade 11, and the external gas cavitation device 12 are connected to the stirring shaft 7. The internal gas cavitation device 10 is disposed inside and cooperates with the nitrogen refining device 9.

[0020] Specifically, the stirring rod 8 stirs the material near the bottom of the reactor 1, causing the material at the bottom to rise and flow with the liquid. The external gas cavitation device 12 refines the suspended bubbles, especially medium and large bubbles. The internal gas cavitation device 10 rapidly refines the nitrogen gas exported from the nitrogen refining device 9, preventing the formation of large bubbles after the nitrogen gas is exported, which would affect the cavitation effect of the stirring blade 11. The stirring blade 11 stirs the liquid, and at the same time, the stirring blade 11 and the refined nitrogen bubbles work together to achieve a cavitation effect, removing the acid in the RDX crystals attached to the bubbles.

[0021] In another embodiment of the present invention, the nitrogen refining device 9 includes an annular gas collecting shell 91, an annular gas venting plate 92, an annular large bubble concentrating shell 93, an annular side screen 94, an annular arc-shaped dispersing net 95, and an annular horizontal plate 96. The annular gas venting plate 92 is connected between the annular gas collecting shell 91 and the annular large bubble concentrating shell 93. One side of the annular side screen 94 is connected to the outside of the annular large bubble concentrating shell 93, and the other side of the annular side screen 94 is connected to the annular horizontal plate 96 through the annular arc-shaped dispersing net 95. The annular gas venting plate 92 is provided with a plurality of conical holes 97.

[0022] Specifically, nitrogen is introduced into the annular gas collecting shell 91 through a nitrogen supply device. As the amount of nitrogen in the annular gas collecting shell 91 increases, the nitrogen enters the annular large bubble collecting shell 93 through the conical hole 97. Then, the nitrogen in the annular large bubble collecting shell 93 is refined and discharged by the internal gas cavitation device 10 and dispersed into the liquid. As the liquid flows, it passes through the annular side screen 94 and the annular arc-shaped dispersion net 95, and finally enters the reaction vessel 1. As the liquid flows, it enters the working range of the stirring blade 11 and undergoes a cavitation effect. The annular side screen 94 and the annular arc-shaped dispersion net 95 cut through excessively large nitrogen bubbles.

[0023] In another embodiment of the present invention, both the internal gas cavitation device 10 and the external gas cavitation device 12 include a turntable 110 and a gas atomizing device 114, and a plurality of the gas atomizing devices 114 are connected to the turntable 110; a plurality of horn-shaped liquid inlet pipes 111 and guide plates 112 are respectively connected to the upper and lower sides of the turntable 110 of the internal gas cavitation device 10, and a retaining ring 113 connected to the horn-shaped liquid inlet pipes 111 is provided on the upper side of the turntable 110.

[0024] Specifically, the stirring shaft 7 drives the turntable 110 to rotate, which in turn drives the gas refining device 114 to rotate. This allows nitrogen bubbles in the liquid to enter the gas refining device 114 for refining, thereby refining medium and large nitrogen bubbles in the liquid, improving the refining ability of nitrogen bubbles, increasing the proportion of nitrogen bubbles in the liquid, and enhancing the cavitation effect of nitrogen bubbles working synergistically with the stirring blades 11. As the turntable 110 rotates, the horn-shaped inlet pipe 111 on the internal gas cavitation device 10 allows the liquid to quickly enter the horn-shaped inlet pipe 111. The liquid is then guided through the horn-shaped inlet pipe 111 into the area of ​​the annular side screen 94 and the annular arc-shaped dispersion net 95, and passes through them. Simultaneously, the guide plate 112 provides the liquid flow force to guide the liquid under the turntable 110 into the annular side screen 94 and the annular arc-shaped dispersion net 95. Within and through the annular side screen 94 and the annular arc-shaped dispersing net 95, the funnel-shaped liquid inlet pipe 111 and the guide plate 112 mainly guide the direction of liquid flow, so that the nitrogen bubbles refined by the gas refining device 114 flow out through the annular side screen 94 and the annular arc-shaped dispersing net 95 with the liquid flow, avoiding the refined nitrogen from accumulating on the lower side of the turntable 110 and in the annular large bubble collection shell 93; at the same time, the gas refining device 114 of the internal gas cavitation device 10 needs to be partially set inside the annular large bubble collection shell 93, so that when excessively large bubbles float to the annular large bubble collection shell 93, they are difficult to be discharged with the water flow, and the discharged state is also a large bubble state, so that the gas refining device 114 discharges the nitrogen concentrated in the annular large bubble collection shell 93 and refines it with the liquid.

[0025] In another embodiment of the present invention, the gas refining device 114 includes a horn-shaped liquid inlet shell 115 and a refining device 116, wherein the refining device 116 is connected to one end of the horn-shaped liquid inlet shell 115 with a small opening; the refining device 116 includes an inner plate 117, an end plate 118 and a spiral refining device 120, wherein a plurality of spiral refining devices 120 are connected between the inner plate 117 and the end plate 118.

[0026] Specifically, by setting a funnel-shaped liquid inlet shell 115, the area for gas and liquid to enter at the inlet is increased, while the flow rate of gas and liquid at the outlet is increased, thereby increasing the effect of gas dispersion and refinement; the spiral refinement device 120 makes the gas and liquid flow in a spiral shape, so that the gas is pulled to form small bubbles, while the spiral flow of liquid disperses the bubbles better, reducing the probability of the bubbles re-colliding to form large bubbles after refinement.

[0027] In another embodiment of the present invention, the spiral refining device 120 includes a sealing plate 121, a connecting pipe 122, a flexible hose 123, a positioning plate 124, and a nut 125. One end of the connecting pipe 122 is connected to the sealing plate 121, and the other end passes through the positioning plate 124 and is connected to the nut 125. A plurality of flexible hoses 123 are arranged around the connecting pipe 122, and their two ends are respectively connected to the sealing plate 121 and the positioning plate 124. The sealing plate 121 and the positioning plate 124 are provided with holes for communicating with the flexible hoses 123. The flexible hoses 123 are spirally arranged. A plurality of refining holes 119 are provided on the inner plate 117 and the end plate 118.

[0028] Specifically, the distance between the sealing plate 121 and the positioning plate 124 is ensured by the connecting pipe 122 and fixed by the nut 125. Its end plate 118 is welded to the end of the horn-shaped liquid inlet shell 115. The liquid is spirally arranged by the hose 123, so that the liquid flows in a spiral shape. The amount of liquid passing through the fine hole 119 is increased and the efficiency of nitrogen finening is increased.

[0029] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention are covered within the scope of the present invention.

Claims

1. A nitrogen-based agitation device for RDX acid removal, comprising a reaction vessel (1), a heating device (2), a filter screen (3), a discharge valve (4), and a power unit (5), wherein the heating device (2) is disposed inside the reaction vessel (1), the filter screen (3) is disposed inside the reaction vessel (1) at the bottom, and the discharge valve (4) and the power unit (5) are respectively disposed at the top and bottom of the reaction vessel (1), characterized in that: The reactor (1) is also equipped with a fine stirring device (6) and a nitrogen finer device (9). The fine stirring device (6) is connected to the power device (5) for transmission. The nitrogen finer device (9) is installed on the inner wall of the reactor (1) and cooperates with the fine stirring device (6).

2. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 1, characterized in that: The refining and stirring device (6) includes a stirring shaft (7), a stirring rod (8), an internal gas cavitation device (10), a stirring blade (11), and an external gas cavitation device (12). One end of the stirring shaft (7) is connected to the power device (5) and the other end is connected to the stirring rod (8). The internal gas cavitation device (10), the stirring blade (11), and the external gas cavitation device (12) are connected to the stirring shaft (7). The internal gas cavitation device (10) is installed inside the nitrogen refining device (9) and cooperates with it.

3. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 2, characterized in that: The nitrogen refining device (9) includes an annular gas collecting shell (91), an annular gas outlet plate (92), an annular large bubble concentrator shell (93), an annular side screen (94), an annular arc-shaped dispersion net (95), and an annular horizontal plate (96). The annular gas outlet plate (92) is connected between the annular gas collecting shell (91) and the annular large bubble concentrator shell (93). One side of the annular side screen (94) is connected to the outside of the annular large bubble concentrator shell (93), and the other side of the annular side screen (94) is connected to the annular horizontal plate (96) through the annular arc-shaped dispersion net (95). The annular gas outlet plate (92) has several conical holes (97).

4. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 3, characterized in that: Both the internal gas cavitation device (10) and the external gas cavitation device (12) include a turntable (110) and a gas atomizing device (114), and several gas atomizing devices (114) are connected to the turntable (110); several horn-shaped liquid inlet pipes (111) and guide plates (112) are respectively connected to the upper and lower sides of the turntable (110) of the internal gas cavitation device (10), and a retaining ring (113) connected to the horn-shaped liquid inlet pipe (111) is provided on the upper side of the turntable (110).

5. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 4, characterized in that: The gas refining device (114) includes a horn-shaped liquid inlet shell (115) and a refining device (116). The refining device (116) is connected to one end of the horn-shaped liquid inlet shell (115) with a small opening. The refining device (116) includes an inner plate (117), an end plate (118), and a spiral refining device (120). A plurality of spiral refining devices (120) are connected between the inner plate (117) and the end plate (118).

6. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 5, characterized in that: The spiral refining device (120) includes a sealing plate (121), a connecting pipe (122), a flexible hose (123), a positioning plate (124), and a nut (125). One end of the connecting pipe (122) is connected to the sealing plate (121), and the other end passes through the positioning plate (124) and is connected to the nut (125). Several flexible hoses (123) are arranged around the connecting pipe (122) and their two ends are respectively connected to the sealing plate (121) and the positioning plate (124). The sealing plate (121) and the positioning plate (124) are provided with holes for communicating with the flexible hoses (123).

7. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 6, characterized in that: The hose (123) is spirally arranged.

8. The nitrogen-based agitation and refining device for RDX acid removal as described in claim 7, characterized in that: The inner plate (117) and the end plate (118) are provided with a number of fine holes (119).

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