Gas-liquid separation device and separation method applied to alkali-making preliming barrel

Abstract

The invention belongs to the technical field of chemical equipment, and particularly relates to a gas-liquid separation device and separation method applied to an alkali-making preliming barrel, a steam outlet in the top end of a barrel body is connected with a baffling filtering system, one end of the baffling filtering system is connected with a condensation filtering system, and the condensation filtering system is communicated with the barrel body; the baffling filtering system comprises a filtering box connected to the steam outlet, two ends of the filtering box are opened, one end of the filtering box is communicated with the interior of the barrel body, and a plurality of baffling plates are connected in the filtering box; the condensation filtering system comprises a separation cylinder which is communicated with the filter box; a conical barrel is connected in the separation barrel, an air outlet is formed in the conical barrel, a funnel is arranged below the conical barrel, the bottom end of the funnel is communicated with the barrel body, and a vortex tube is connected to the top end of the conical barrel. Compared with the prior art, through two-stage filtration, not only are particulate matters effectively filtered, but also mixed liquid in gas can be recycled, so that the purity of ammonia gas can be improved, and the reaction of the next procedure is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, and in particular to a gas-liquid separation device and separation method applied to a pre-liming barrel for soda production. Background Art

[0002] In the ammonia-soda process for soda production, the pre-liming barrel is an important device in its technological process. Its main function is to fully mix and react the preheated mother liquor in the distillation column with lime milk, so that the combined ammonium in the preheated mother liquor becomes free ammonia. The obtained blended liquid is then sent back to the distillation column to distill out the free ammonia. At the same time, the ammonia gas generated by the reaction in the pre-liming barrel is transmitted from the steam outlet at the upper end of the pre-liming barrel to the free ammonia tower.

[0003] The steam outlet of the pre-liming barrel is used to discharge the steam generated by the reaction in the pre-liming barrel, and at the same time, it also has the function of controlling the pressure inside the barrel. When the traditional pre-liming barrel discharges steam, the gas will be mixed with the blended liquid and discharged together. This part of the gas-liquid mixture will enter the free ammonia tower along the pipeline, which will affect the reaction effect of the free ammonia tower. At the same time, the discharge of this part of the gas-liquid mixture will also cause waste of resources. Some existing pre-liming barrels will add atomizing nozzles at the steam outlet or at the end of the pipeline, thereby reducing the discharge of the blended liquid, but it will lead to uneven distribution of the washing area, resulting in blockage of the subsequent pipeline and affecting the production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas-liquid separation device and separation method applied to a pre-liming barrel for soda production. This device abandons the traditional direct discharge or the discharge method using atomizing nozzles. A baffle filtration system is first added at the steam outlet of the pre-liming barrel, so that the liquid-carrying substances in the barrel first pass through the filtration of the baffle plate to filter out particulate matter and blended liquid. This is the first-stage filtration system. The filtered steam enters the condensation filtration system through a pipeline. The steam will liquefy on the outer wall of the conical barrel, and the condensed small water droplets will flow into the barrel under the action of their own gravity, while the separated ammonia gas will enter the free ammonia tower along the pipeline upward. This is the second-stage filtration system. Through two-stage filtration, not only can particulate matter be effectively filtered, but also the blended liquid mixed in the gas can be recovered, thereby improving the purity of ammonia gas and being beneficial to the reaction in the next process, so as to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A gas-liquid separation device applied to a pre-liming barrel for soda production, comprising a barrel body, on which a steam outlet is provided; a baffle filtration system is connected to the steam outlet at the top of the barrel body, one end of the baffle filtration system is connected to a condensation filtration system, and the condensation filtration system is communicated with the barrel body; the baffle filtration system includes a filter box connected to the steam outlet, the filter box has openings at both ends and one end is communicated with the inside of the barrel body, and several baffle plates are connected inside the filter box; the condensation filtration system includes a separation cylinder, the separation cylinder is communicated with the filter box; a conical barrel is connected inside the separation cylinder, the conical barrel is provided with air holes, a funnel is arranged below the conical barrel, the bottom end of the funnel is communicated with the barrel body, and the top end of the conical barrel is connected with a vortex tube.

[0006] A further solution of the present invention is that the filter box is cylindrical, the top end of the filter box is connected to the upper opening of the steam outlet, one end of a steam pipe is connected to the top end of the filter box, and the other end is communicated with the separation cylinder; the baffle plates are in an S shape, and several baffle plates are fixedly connected vertically in parallel to the box wall of the filter box.

[0007] A further solution of the present invention is that the baffle plates are of a single-arch or multi-arch structure, the thickness dimension of the baffle plates is 0.7 - 1.2 mm, preferably 1 mm, and the spacing dimension between adjacent baffle plates is 8 - 12 mm, preferably 10 mm.

[0008] A further solution of the present invention is that an upper fixing plate and a lower fixing plate are connected to the inner wall of the separation cylinder; an upper hanging ear is provided on the inner circle of the upper fixing plate, the conical barrel is hung on the upper hanging ear through a hook on the outer wall, several through holes for exhausting air are provided on the upper fixing plate, and the through hole size is 14 - 18 mm, preferably 16 mm; a lower hanging ear is provided on the inner circle of the lower fixing plate, and the funnel is hung on the lower hanging ear through a hook on the outer wall.

[0009] A further solution of the present invention is that the conical barrel is of a hollow structure, four air holes at the top end of the conical barrel are distributed in an annular array, the inner diameter dimension of the air holes is 8 - 12 mm, preferably 10 mm; the height ratio of the separation cylinder to the conical barrel is 1.41, the taper of the conical barrel is 0.66, the surface area of the conical barrel is 0.3067 m 2 , the wall thickness dimension of the conical barrel is 8 - 12 mm, preferably 10 mm; the bottom end of the conical barrel extends into the funnel, and the bottom end of the funnel is connected with an elbow, and the elbow passes through the top end of the barrel body and extends into the barrel body.

[0010] A further solution of the present invention is that the bottom end of the vortex tube is a cold tube end, the top end is a heat tube end, a sleeve is connected to the outer wall of the tube body of the vortex tube, an air inlet for connecting compressed air is provided on the sleeve, and several inclined holes arranged in an annular array are provided on the vortex tube inside the sleeve; the top end of the conical barrel is connected with a joint, several long grooves are opened on the joint, and the cold tube end of the vortex tube is inserted into the joint and locked by a hose clamp.

[0011] A further solution of the present invention is that the separation cylinder is a detachable split structure. The separation cylinder includes two fixed cylinder walls and two movable cylinder walls. The two ends of the fixed cylinder wall are in a convex shape structure, and the two ends of the movable cylinder wall are in a concave shape structure. The fixed cylinder wall and the movable cylinder wall are arranged alternately with their convex and concave parts interlocked and connected by a bolt and nut assembly.

[0012] A further solution of the present invention is that the inner walls of the fixed cylinder wall and the movable cylinder wall are provided with long sliding grooves and short sliding grooves. The outer circles of the upper fixing plate and the lower fixing plate are both provided with convex blocks. The upper fixing plate is clamped in the short sliding groove through the convex block, and the lower fixing plate is clamped in the long sliding groove through the convex block.

[0013] A method for gas-liquid separation of a pre-liming barrel for soda production, using the above gas-liquid separation device applied to a pre-liming barrel for soda production, includes the following steps: Step 1: When the pre-liming barrel is working, ammonia gas will be generated after the lime milk and preheated mother liquor in the barrel react fully. The ammonia gas will rise and be discharged outwards from the steam outlet. However, the directly generated ammonia gas will be mixed with small particles and blending liquid. When the ammonia gas flows through the baffle plate, some particulate matter and a small amount of blending liquid will be filtered out first. When the blending liquid passes through the baffle plate, the blending liquid will adhere to the baffle plate. As the device operates in the long term, due to the influence of surface tension, the volume of the blending liquid becomes larger and larger. When the self-weight is greater than the adhesion force, the small liquid beads will fall back into the pre-liming barrel from the baffle plate, and the substances not filtered out will continue to be discharged upwards from the steam outlet. This is the first-stage filtration system.

[0014] Step 2: Compressed air enters from the air inlet of the eddy current tube, and the generated cold air will be blown out from the cold end tube to cool the chamber in the cone barrel, so that the outer surface temperature of the cone decreases. Since the liquid-carrying gas in the pre-liming barrel has a certain high temperature, when the liquid-carrying gas touches the low-temperature outer surface of the cone barrel, liquefaction will occur on the outer wall of the cone barrel to generate small water droplets. As the device operates in the long term, the generated small water droplets will fall into the funnel and flow back into the pre-liming barrel along the elbow, and the separated ammonia gas will continue to rise and enter the next process through the pipeline. This is the second-stage filtration system.

[0015] The beneficial effects of the present invention: The gas-liquid separation device and separation method applied to the pre-liming bucket for soda production of the present invention discard the traditional direct emission or the emission method using atomizing nozzles. A baffle filtration system is first added at the steam outlet of the pre-liming bucket, so that the liquid-carrying substances in the bucket first pass through the filtration of the baffle plate to filter particulate matters and the blending liquid. This is the first-stage filtration system. The filtered steam enters the condensation filtration system through a pipeline. The steam will liquefy on the outer wall of the conical barrel, and the condensed small water droplets will flow down into the barrel under the action of their own gravity, while the separated ammonia gas will enter the free ammonia tower upward along the pipeline. This is the second-stage filtration system. Through the two-stage filtration, not only particulate matters are effectively filtered, but also the blending liquid mixed in the gas can be recovered, thereby improving the purity of ammonia gas and being beneficial to the reaction in the next process (free ammonia tower).

[0016] For the gas-liquid separation device and separation method applied to the pre-liming bucket for soda production of the present invention, an elbow is provided at the outlet of the funnel to prevent the liquid-carrying gas in the pre-liming bucket from returning upward from the funnel outlet into the separation cylinder.

[0017] For the gas-liquid separation device and separation method applied to the pre-liming bucket for soda production of the present invention, the separation cylinder adopts a detachable split structure. When a failure occurs or maintenance is required inside the separation cylinder, only the movable cylinder wall needs to be removed for maintenance, which is convenient for workers to maintain. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is an installation schematic diagram of the baffle filtration system and the condensation filtration system of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the baffle filtration system of the present invention.

[0021] Figure 4 It is an installation schematic diagram of the baffle filtration system of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the condensation filtration system of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the condensation filtration system of the present invention.

[0024] Figure 7 It is a connection schematic diagram of the vortex tube and the conical barrel of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of the conical barrel of the present invention.

[0026] Figure 9 It is an installation schematic diagram of the conical barrel of the present invention.

[0027] Figure 10 Schematic diagram of the funnel installation of the present invention.

[0028] Figure 11 Schematic diagram of the vortex tube structure of the present invention.

[0029] Figure 12 Schematic diagram of the fixed cylinder wall structure of the present invention.

[0030] Figure 13 Schematic diagram of the movable cylinder wall structure of the present invention.

[0031] Figure 14 Schematic diagram of the upper fixing plate structure of the present invention.

[0032] Figure 15 Schematic diagram of the lower fixing plate structure of the present invention.

[0033] Figure 16 Schematic diagram of the working of the condensation and filtration system of the present invention.

[0034] In the figure: 1 - barrel body, 101 - steam outlet, 2 - baffle filtration system, 201 - filter box, 202 - baffle plate, 3 - condensation and filtration system, 301 - separation cylinder, 3011 - fixed cylinder wall, 3012 - movable cylinder wall, 3013 - long sliding groove, 3014 - short sliding groove, 302 - conical barrel, 3021 - air outlet hole, 3022 - joint, 303 - funnel, 304 - vortex tube, 3041 - cold tube end, 3042 - hot tube end, 3043 - sleeve, 3044 - air inlet, 3045 - inclined hole, 305 - upper fixing plate, 3051 - through hole, 3052 - upper hanging ear, 306 - lower fixing plate, 3061 - lower hanging ear, 307 - elbow, 308 - hose clamp, 4 - steam pipe. Detailed implementation manners

[0035] The present invention will be further clarified below with reference to the accompanying drawings and specific embodiments.

[0036] As Figure 1 、 2As shown in the figure, a gas-liquid separation device applied to a pre-liming barrel for soda production includes a barrel body 1, and a steam outlet 101 is provided on the barrel body 1; a baffle filtration system 2 is connected to the steam outlet 101 at the top of the barrel body 1, one end of the baffle filtration system 2 is connected to a condensation filtration system 3, and the condensation filtration system 3 is communicated with the barrel body 1; the baffle filtration system 2 includes a filter box 201 connected to the steam outlet 101, both ends of the filter box 201 are open and one end is communicated with the inside of the barrel body 1, and several baffle plates 202 are connected inside the filter box 201; the condensation filtration system 3 includes a separation cylinder 301, and the separation cylinder 301 is communicated with the filter box 201; a conical barrel 302 is connected inside the separation cylinder 301, an air outlet hole 3021 is provided on the conical barrel 302, a funnel 303 is arranged below the conical barrel 302, the bottom end of the funnel 303 is communicated with the barrel body 1, and a vortex tube 304 is connected to the top end of the conical barrel 302.

[0037] As Figure 3 shown, the filter box 201 is cylindrical, the top end of the filter box 201 is connected to the upper opening of the steam outlet 101, one end of a steam pipe 4 is connected to the top end of the filter box 201, and the other end is communicated with the separation cylinder 301; the baffle plates 202 are in an S shape, and several baffle plates 202 are welded vertically in parallel on the box wall of the filter box 201, and can filter out small particle substances and part of the blending liquid mixed in the gas during the working process to achieve preliminary filtration. The baffle plates 202 are of a double-arch structure, the thickness dimension of the baffle plates 202 is 1 mm, and the spacing dimension between adjacent baffle plates 202 is 10 mm.

[0038] As Figure 5 、 6 、14, 15 shown, upper fixing plate 305 and lower fixing plate 306 are connected to the inner wall of the separation cylinder 301; upper hanging ears 3052 are provided on the inner circle of the upper fixing plate 305, the conical barrel 302 is hung on the upper hanging ears 3052 through the hooks on the outer wall, several through holes 3051 for exhausting gas are provided on the upper fixing plate 305, the size of the through holes 3051 is 16 mm, and are used to discharge the filtered ammonia gas; lower hanging ears 3061 are provided on the inner circle of the lower fixing plate 306, and the funnel 303 is hung on the lower hanging ears 3061 through the hooks on the outer wall.

[0039] As Figure 8 、 9 、10 shown, the conical barrel 302 is of a hollow structure and is used to store the low-temperature gas discharged by the vortex tube 304. Four air outlet holes 3021 at the top end of the conical barrel 302 are distributed in an annular array, and the inner diameter dimension of the air outlet holes 3021 is 10 mm, which is used to balance the air pressure inside the conical barrel 302; the height ratio of the separation cylinder 301 to the conical barrel 302 is 1.41, the taper of the conical barrel 302 is 0.66, and the surface area of the conical barrel 302 is 0.3067 m 2, the wall thickness dimension of the conical barrel 302 is 10 mm. The cold gas inside the conical barrel 302 can be effectively transferred to the outer surface of the conical barrel 302, so that the liquid-carrying gas can effectively liquefy on the surface of the conical barrel 302; the bottom end of the conical barrel 302 extends into the funnel 303, and the funnel 303 is used to collect the small water droplets liquefied on the conical barrel 302. After collecting the small water droplets, they flow back into the pre-liming barrel; as Figure 2 shown, the bottom end of the funnel 303 is connected with an elbow 307. The elbow 307 passes through the top end of the barrel body 1 and extends into the barrel body 1. The elbow 307 can prevent the liquid-carrying gas in the pre-liming barrel from returning from the outlet of the funnel 303 to the inside of the separation cylinder 301.

[0040] As Figure 7 , 11 shown, the bottom end of the vortex tube 304 is the cold tube end 3041, and the top end is the hot tube end 3042. The outer wall of the tube body of the vortex tube 304 is connected with a sleeve 3043. An air inlet 3044 for accessing compressed air is provided on the sleeve 3043. Several inclined holes 3045 arranged in an annular array are provided on the vortex tube 304 inside the sleeve 3043. During operation, the compressed air enters from the air inlet 3044, and the 4 inclined holes 3045 on the tube wall can form a rotating air flow. When the compressed air enters the pipeline, a high-speed rotating vortex will be formed inside the tube. Due to the action of centrifugal force, the gas will be divided into two parts. The heavier gas molecules are pushed to the outside of the vortex, while the lighter gas molecules gather towards the center. Due to friction and collision, part of the air flow in the central layer loses energy, resulting in low kinetic energy, reduced speed, and a sharp drop in temperature. The low-temperature gas in the center will flow out from the cold end tube, while the temperature of the outer air flow rises, the rotation speed decreases, and it is pushed to the outer wall and flows out from the hot tube end 3042 at the other end, thus realizing cold air output at one end and hot air output at the other end. By adjusting the control valve of the intake air, the temperature of the cold air can be controlled, and the lowest can reach -50 °C, so as to effectively cool the inner cavity of the conical barrel 302. The top end of the conical barrel 302 is connected with a joint 3022, and several long grooves are opened on the joint 3022. The cold tube end 3041 of the vortex tube 304 is inserted into the joint 3022 and locked by a hose clamp 308. This installation method not only has good sealing effect, but also is convenient for installation and disassembly.

[0041] Embodiment 2: This embodiment is a further improvement of Embodiment 1. The main improvement lies in that when Embodiment 1 is used, it is not convenient to overhaul inside the separation cylinder 301; while in this embodiment, the above defects can be avoided. Specifically: As Figure 12 , 13The separation cylinder 301 is a detachable split structure. The separation cylinder 301 includes two fixed cylinder walls 3011 and two movable cylinder walls 3012. The two ends of the fixed cylinder wall 3011 are in a convex shape structure, and the two ends of the movable cylinder wall 3012 are in a concave shape structure. The fixed cylinder wall 3011 and the movable cylinder wall 3012 are arranged alternately with their convex and concave parts interlocked and connected by a bolt and nut assembly, which also plays a sealing role to prevent ammonia gas in the cylinder from leaking. The inner walls of the fixed cylinder wall 3011 and the movable cylinder wall 3012 are provided with long sliding grooves 3013 and short sliding grooves 3014. The outer circles of the upper fixing plate 305 and the lower fixing plate 306 are both provided with convex blocks. The upper fixing plate 305 is clamped in the short sliding groove 3014 through the convex block, and the lower fixing plate 306 is clamped in the long sliding groove 3013 through the convex block. In this embodiment, the separation cylinder 301 adopts a detachable split structure. When a fault occurs or maintenance is required inside the separation cylinder 301, only the movable cylinder wall 3012 needs to be removed for repair, which is convenient for workers to maintain.

[0042] In addition, this embodiment is exactly the same as Embodiment 1 and will not be elaborated here.

[0043] When installing the device, first install the baffle filtration system 2, such as Figure 4As shown in the figure, during installation, first weld the baffle plate 202 and the filter box 201 into a whole and place it into the steam outlet 101. The height of this whole is lower than the overall height of the steam outlet 101. The flange at the steam outlet 101 is matched with the flange on the filter box 201. Then install the steam pipe 4 onto the flange of the filter box 201, and finally fasten the three flanges through a bolt-nut assembly; the other end of the steam pipe 4 is connected to one of the fixed cylinder walls 3011, and then install another fixed cylinder wall 3011; then install two movable cylinder walls 3012. The fixed cylinder walls 3011 and the movable cylinder walls 3012 are arranged in an alternating and interlocking pattern of concave and convex and are connected through a bolt-nut assembly to form a complete separation cylinder 301; then use the bolt-nut assembly to fasten the lower end of the separation cylinder 301 to the barrel body 1 of the pre-liming tank; next, install the internal part of the condensation and filtration system 3. A total of 8 L-shaped chutes are opened in the fixed cylinder wall 3011 and the movable cylinder wall 3012, including 4 short chutes 3014 and 4 long chutes 3013. The short chutes 3014 are used to cooperate with the four protrusions on the outer ring of the upper fixing plate 305, and the long chutes 3013 are used to cooperate with the four protrusions on the outer ring of the lower fixing plate 306; first, place the 4 protrusions of the lower fixing plate 306 into the 4 long chutes 3013. After reaching the bottom of the long chutes 3013, rotate the lower fixing plate 306 clockwise to the end position; then place the funnel 303 so that the four hooks around the funnel 303 are matched with the four hanging ears on the inner ring of the lower fixing plate 306; then place the 4 protrusions of the upper fixing plate 305 into the 4 short chutes 3014. After reaching the bottom of the short chutes 3014, rotate the upper fixing plate 305 counterclockwise to the end position; finally, place the conical barrel 302 so that the four hooks around the conical barrel 302 are matched with the four hanging ears of the upper fixing plate 305, and the assembly is completed; when the condensation and filtration system 3 is under maintenance, due to the modular cylinder wall design method, it is more convenient to disassemble during maintenance. There is no need to disassemble the entire pipeline. During maintenance, only the two movable cylinder walls 3012 need to be disassembled, and the workers can perform maintenance.

[0044] The specific working principle of the present invention is as follows: When the pre-liming tank is working, ammonia gas will be generated after the lime milk and the preheated mother liquor in the barrel body 1 fully react. The ammonia gas will rise and be discharged outward from the steam outlet 101. However, the directly generated ammonia gas will be mixed with small particles and the blending liquid. When the ammonia gas flows through the baffle plate 202, some particulate matter and a small amount of the blending liquid will be filtered out first. When the blending liquid passes through the baffle plate 202, the blending liquid will adhere to the baffle plate 202. As the device operates for a long period, due to the influence of surface tension, the volume of the blending liquid becomes larger and larger. When the self-weight is greater than the adhesion force, the small liquid beads will fall back into the pre-liming tank from the baffle plate 202, and the substances that have not been filtered out will continue to be discharged upward from the steam outlet 101. This is the first-stage filtration system.

[0045] As Figure 16As shown in the figure, compressed air enters from the air inlet 3044 of the vortex tube 304, and the generated cold air will be blown out from the cold end tube to cool the chamber in the cone barrel 302, causing the temperature of the outer surface of the cone to drop. Since the liquid-carrying gas in the pre-ash bucket has a certain high temperature, when the liquid-carrying gas touches the low-temperature outer surface of the cone barrel 302, liquefaction will occur on the outer wall of the cone barrel 302, generating small water droplets. As the device operates in the long term, the generated small water droplets will fall into the funnel 303 and flow back to the pre-ash bucket along the elbow 307, while the separated ammonia gas will continue to rise and enter the next process through the pipeline. This is the second-stage filtration system.

[0046] The above embodiments are only for explaining the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A gas-liquid separation device used in a pre-ash barrel for alkali production, comprising a barrel body (1), wherein a steam outlet (101) is provided on the barrel body (1); the characteristics are: A baffled filtration system (2) is connected to the steam outlet (101) at the top of the barrel body (1); one end of the baffled filtration system (2) is connected to a condensation filtration system (3), and the condensation filtration system (3) is connected to the barrel body (1); The baffle filtration system (2) comprises a filter box (201) connected to the steam outlet (101); the filter box (201) has openings at both ends and one end is connected to the interior of the barrel (1); and a plurality of baffle plates (202) are connected to the filter box (201); The condensation filtration system (3) comprises a separation cylinder (301), wherein the separation cylinder (301) is connected to a filter box (201); a conical barrel (302) is connected inside the separation cylinder (301), an air outlet (3021) is provided on the conical barrel (302), a funnel (303) is provided below the conical barrel (302), the bottom end of the funnel (303) is connected to the barrel body (1), and the top end of the conical barrel (302) is connected to a vortex tube (304).

2. A gas-liquid separation device for use in a pre-ash barrel for alkali production as claimed in claim 1, characterized in that: The filter box (201) is cylindrical, the top of the filter box (201) is connected to the upper opening of the steam outlet (101), one end of the steam pipe (4) is connected to the top of the filter box (201), and the other end is connected to the separation cylinder (301); the baffles (202) are S-shaped, and a plurality of baffles (202) are vertically fixed to the wall of the filter box (201) in parallel.

3. A gas-liquid separation device for use in a pre-ash barrel for alkali production as claimed in claim 1 or 2, characterized in that: The baffle plate (202) is a single-bow or multi-bow structure, the thickness of the baffle plate (202) is 0.7-1.2 mm, and the spacing between adjacent baffle plates (202) is 8-12 mm.

4. The gas-liquid separation device used in the alkali pre-ash barrel according to claim 1, characterized in that: The inner wall of the separation cylinder (301) is connected to an upper fixing plate (305) and a lower fixing plate (306); an upper hanging ear (3052) is provided on the inner ring of the upper fixing plate (305), and the cone barrel (302) is hung on the upper hanging ear (3052) via a hook on the outer wall; a plurality of through holes (3051) for exhaust are provided on the upper fixing plate (3055), and the size of the through holes (3051) is 14-18 mm; a lower hanging ear (3061) is provided on the inner ring of the lower fixing plate (306), and the funnel (303) is hung on the lower hanging ear (3061) via a hook on the outer wall.

5. The gas-liquid separation device used in the alkali pre-ash barrel according to claim 1, characterized in that: The conical barrel (302) is a hollow structure. The four air outlet holes (3021) at the top of the conical barrel (302) are distributed in a circular array. The inner diameter of the air outlet holes (3021) is 8-12 mm. The height ratio of the separation cylinder (301) to the conical barrel (302) is 1.

41. The taper of the conical barrel (302) is 0.

66. The surface area of ​​the conical barrel (302) is 0.3067 m 2 The wall thickness of the conical barrel (302) is 8-12 mm; the bottom end of the conical barrel (302) extends into the funnel (303); the bottom end of the funnel (303) is connected to an elbow (307); the elbow (307) passes through the top of the barrel body (1) and extends into the interior of the barrel body (1).

6. A gas-liquid separation device for use in a pre-ash barrel for alkali production as claimed in claim 1 or 5, characterized in that: The bottom end of the vortex tube (304) is a cold tube end (3041), and the top end is a hot tube end (3042); a sleeve (3043) is connected to the outer wall of the tube body of the vortex tube (304); an air inlet (3044) for receiving compressed air is provided on the sleeve (3043); a plurality of inclined holes (3045) arranged in a ring array are provided on the vortex tube (304) inside the sleeve (3043); a joint (3022) is connected to the top end of the cone barrel (302); a plurality of long grooves are provided on the joint (3022); the cold tube end (3041) of the vortex tube (304) is plugged into the joint (3022) and locked by a throat clamp (308).

7. The gas-liquid separation device used in the pre-ash barrel of alkali production as claimed in claim 4, characterized in that: The separation cylinder (301) is a detachable split structure, and comprises two fixed cylinder walls (3011) and two movable cylinder walls (3012). The two ends of the fixed cylinder wall (3011) are in a convex shape, and the two ends of the movable cylinder wall (3012) are in a concave shape. The fixed cylinder wall (3011) and the movable cylinder wall (3012) are arranged in an interlaced manner, and the concave and convex parts are interlocked and connected via a bolt and nut assembly.

8. The gas-liquid separation device used in the pre-ash barrel of alkali production as claimed in claim 7, characterized in that: The inner walls of the fixed cylinder wall (3011) and the movable cylinder wall (3012) are provided with a long slide groove (3013) and a short slide groove (3014); the outer rings of the upper fixed plate (305) and the lower fixed plate (306) are provided with protrusions; the upper fixed plate (305) is clamped to the short slide groove (3014) via the protrusions; and the lower fixed plate (306) is clamped to the long slide groove (3013) via the protrusions.

9. A gas-liquid separation method for a pre-ash barrel for alkali production, using a gas-liquid separation device for a pre-ash barrel for alkali production as claimed in any one of claims 1 to 8, characterized in that The steps include: Step 1: When the pre-ash barrel is working, the lime milk and the preheated mother liquor in the barrel body (1) will fully react to generate ammonia gas, which will rise and be discharged from the steam outlet (101). However, the directly generated ammonia gas will be mixed with small particles and blending liquid. When the ammonia gas flows through the baffle (202), some particulate matter and a small amount of blending liquid will be filtered out first. When the blending liquid passes through the baffle (202), the blending liquid will adhere to the baffle (202). As the device runs for a long period of time, due to the influence of surface tension, the volume of the blending liquid becomes larger and larger. When the dead weight is greater than the adhesion force, the small liquid droplets will fall from the baffle (202) back into the pre-ash barrel, and the substances that have not been filtered out will continue to be discharged upward from the steam outlet (101). This is the first-stage filtration system; Step 2: Compressed air enters from the air inlet (3044) of the vortex tube (304), and the generated cold air is blown out from the cold end pipe to cool the chamber in the cone barrel (302), so that the temperature of the outer surface of the cone decreases. Since the liquid-carrying gas in the pre-ash barrel has a certain high temperature, the liquid-carrying gas will liquefy on the outer wall of the cone barrel (302) after hitting the outer surface of the low-temperature cone barrel (302), generating small water droplets. As the device runs for a long period of time, the generated small water droplets fall into the funnel (303) and flow back to the pre-ash barrel along the elbow (307), while the separated ammonia will continue to rise and enter the next process through the pipeline. This is the second-stage filtration system.

Images