Hydrochloric acid recovery and concentration process equipment

Abstract

The invention relates to hydrochloric acid recovery and concentration process equipment, and relates to the technical field of hydrochloric acid treatment.The hydrochloric acid recovery and concentration process equipment comprises a furnace body, a gas outlet and a discharge port are formed in the furnace body, a heating piece is arranged in the furnace body, a spray gun is arranged on the furnace body, a liquid inlet of the spray gun communicates with a liquid inlet pipe, and a liquid outlet of the spray gun communicates with a spray pipe; the spray pipe penetrates through the furnace body, and one end is positioned in the furnace body; a rotational flow disc is arranged in the spray pipe, a plurality of rotational flow holes are formed in the rotational flow disc in the circumferential direction, the multiple rotational flow holes are obliquely formed in the direction facing the inner wall of the spray pipe, and the multiple rotational flow holes are spirally distributed in the cross section of the rotational flow disc. A rotating shaft parallel to the axial direction of the spray pipe is rotationally arranged on the side, away from the spray gun, of the rotational flow disc, and scraping rods used for scraping particles attached to the inner wall of the spray pipe are arranged on the rotating shaft in the axial direction. The waste acid recycling device has the effect of preventing the waste acid from reacting at the spray pipe to generate fixed product particles to block the spray pipe, so that the recycling efficiency of the waste acid is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of hydrochloric acid treatment technology, and in particular to a hydrochloric acid recovery and concentration process equipment. Background Art

[0002] Hydrochloric acid is often used in industry to clean materials or equipment such as steel. In this process, a large amount of waste hydrochloric acid with a high iron content is produced. These hydrochloric acids have high iron content and low concentration, lacking industrial application value, and directly discharged as wastewater will cause serious pollution. However, through simple treatment procedures, these waste acids can be treated under relatively mild conditions to obtain industrial-grade concentrated hydrochloric acid with greater commercial value, which can be reused.

[0003] Existing methods for concentrating and regenerating waste hydrochloric acid generally include spray roasting method and fluidized bed roasting method. When regenerating waste hydrochloric acid by spray roasting method, waste hydrochloric acid needs to be sprayed into a roasting furnace through a spray gun for heating reaction. The heating reaction generates solid product iron particles and gaseous product concentrated hydrochloric acid. The solid product is discharged through the discharge port for recovery, and the gaseous product is discharged through the gas outlet for subsequent processing steps. After a series of processing treatments, it can be used to regenerate industrial-grade concentrated hydrochloric acid, completing the concentration and regeneration of waste hydrochloric acid.

[0004] However, in the process of concentrating and regenerating waste hydrochloric acid by spray roasting, due to the small diameter of the nozzle of the spray gun, when the spray gun sprays the waste hydrochloric acid into the roasting furnace, the waste hydrochloric acid may react at the nozzle of the spray gun and generate solid product particles. At this time, the solid product particles may directly adhere to the nozzle. When a certain amount of solid product particles adhere, the spray effect of the spray gun will be reduced or even completely blocked, resulting in a reduction in the recovery efficiency of the waste hydrochloric acid. Summary of the invention

[0005] In order to improve the problem in the prior art that when the spray gun sprays waste hydrochloric acid into the roasting furnace, the waste hydrochloric acid will react at the nozzle of the spray gun and generate solid product particles. At this time, the solid product particles may directly adhere to the nozzle. When a certain amount of solid product particles adhere, the spray effect of the spray gun will be reduced or even completely blocked, resulting in reduced recovery efficiency of the waste hydrochloric acid. The present application provides a hydrochloric acid recovery and concentration process equipment.

[0006] The hydrochloric acid recovery and concentration process equipment provided in this application adopts the following technical solution: A hydrochloric acid recovery and concentration process equipment comprises a furnace body, the furnace body is provided with an air outlet and a material outlet, the furnace body is provided with a heating element, the furnace body is provided with a spray gun, the liquid inlet of the spray gun is connected with a liquid inlet pipe, the liquid outlet of the spray gun is connected with a spray pipe, the spray pipe passes through the furnace body and has one end located in the furnace body; a swirl disk is provided in the spray pipe, a plurality of swirl holes are provided in the circumferential direction on the swirl disk, the plurality of swirl holes are all inclinedly arranged in a direction toward the inner wall of the spray pipe, and the plurality of swirl holes are distributed in a spiral shape on the cross section of the swirl disk; a rotating shaft parallel to the axial direction of the spray pipe is rotatably arranged on the side of the swirl disk away from the spray gun, and a scraper rod for scraping particles adhering to the inner wall of the spray pipe is axially arranged on the rotating shaft.

[0007] By adopting the above technical solution, the waste acid enters the spray gun through the nozzle, the spray gun atomizes the waste acid and sprays it into the nozzle, and then enters the furnace body through the nozzle. Under the action of the heating element, the waste acid undergoes a heating reaction in the furnace body to produce iron particles and hydrochloric acid vapor. The iron particles are discharged through the discharge port, and the hydrochloric acid vapor is discharged through the gas outlet to be reused. Since the liquid sprayed from the spray gun enters the furnace body through the nozzle, the waste hydrochloric acid is prevented from reacting directly at the spray gun to produce fixed product particles. In the process of the waste acid entering the furnace body through the nozzle, the waste acid will pass through the nozzle. Through the swirl holes on the swirl disk, since the multiple swirl holes are inclined in the direction toward the inner wall of the nozzle and the cross-sections of the multiple swirl holes on the swirl disk are spiral, the waste acid atomized by the spray gun will be sprayed into the nozzle in a swirl shape. The waste acid sprayed in a swirl shape contacts the rotating shaft and the scraper rod. The rotating shaft and the scraper rod will rotate under the action of the waste acid. During the rotation of the scraper rod, the particles adhered to the inner wall of the nozzle are scraped off to avoid the fixed product particles generated by the reaction of the waste acid at the nozzle from clogging the nozzle, thereby ensuring the recovery efficiency of the waste acid.

[0008] Optionally, a plurality of direct current holes are formed on the swirl disk, and the direct current holes are parallel to the axis of the nozzle.

[0009] By adopting the above technical solution, part of the waste acid is ejected through the swirl hole to push the rotating shaft and the scraper rod, and the other part is ejected directly through the direct flow hole, thereby increasing the speed of the waste acid passing through the nozzle.

[0010] Optionally, a reinforcing rod is provided between the scraper rod and the rotating shaft.

[0011] By adopting the above technical solution, the reinforcing rod is arranged between the scraper rod and the rotating shaft to improve the connection strength between the scraper rod and the rotating shaft, thereby improving the stability of the scraper rod and the rotating shaft during rotation.

[0012] Optionally, the heating element includes a heating plate arranged in the furnace body, the heating plate is provided with filter holes, the discharge port, the heating plate, the nozzle and the air outlet are arranged in sequence from low to high, and the nozzles are arranged inclined in the direction toward the heating plate.

[0013] By adopting the above technical solution, since the nozzle is inclined in the direction toward the heating disk, the waste acid will be sprayed directly onto the heating disk through the nozzle, and the waste acid can contact the heating disk in time and quickly to undergo a heating reaction, thereby improving the efficiency of waste acid recovery, and the iron particles generated by the contact reaction between the waste acid and the heating disk will fall downward through the filter holes, and the iron particles will be discharged through the discharge port under the action of gravity, while the hydrochloric acid vapor will move upward due to the heat and be discharged through the gas outlet, thereby facilitating the separation of the iron particles and the hydrochloric acid vapor.

[0014] In addition, since the nozzle is tilted toward the heating plate, this setting will cause the nozzle to tilt downward, and the particles scraped by the scraper rod will automatically fall onto the heating plate under the action of gravity, and then fall to the discharge port through the filter holes, thereby further avoiding the accumulation of particles in the nozzle and causing blockage of the nozzle.

[0015] Optionally, a plurality of nozzles are arranged on the inner wall of the furnace body along the circumferential direction, and the plurality of nozzles are distributed in a spiral shape on the cross section of the furnace body.

[0016] By adopting the above technical solution, a plurality of nozzles are arranged on the furnace body, and the plurality of nozzles are arranged in a spiral shape on the cross section of the furnace body, so that the waste acid sprayed through different nozzles will produce mutual push, thereby improving the fluidity of the waste acid when it is in the furnace body, and further facilitating the contact between the waste acid and the heating plate for sufficient reaction; and because a plurality of nozzles are arranged on the furnace body, the waste acid can be hit onto the heating plate from various directions of the heating plate through the plurality of nozzles, further improving the adequacy of the contact between the waste acid and the heating plate.

[0017] Optionally, a cleaning rod is slidably provided on the heating plate, and bristles are provided on the cleaning rod, and the bristles are inserted into the filter holes.

[0018] By adopting the above technical solution, after the waste acid is sprayed out through multiple nozzles, the waste acids will push each other, and the cleaning rod will contact with the obliquely sprayed waste acid at the same time and slide under the push of the waste acid. The sliding of the cleaning rod drives the movement of the bristles, thereby cleaning the filter holes to prevent iron particles from clogging the filter holes, thereby causing the iron particles to dock on the heating plate and be difficult to fall to the discharge port, thereby affecting the contact between the heating plate and the waste acid.

[0019] Optionally, a connecting shaft is provided on the heating plate, a connecting ring is rotatably connected to the connecting shaft, a ball in contact with the connecting shaft is provided on the connecting ring, and a plurality of cleaning rods are provided, and the plurality of cleaning rods are connected to the cleaning rod.

[0020] By adopting the above technical solution, the cleaning rod slides under the push of the waste acid, and the movement of the cleaning rod drives the connecting ring to rotate, and the rotating connecting ring can drive each cleaning rod to move on the heating plate, thereby enabling the cleaning rod to better clean the heating plate; since the connecting ring is provided with a ball in contact with the connecting shaft, when the connecting ring rotates, the ball rolls, thereby improving the flexibility of the connecting ring during rotation, thereby making the movement of multiple cleaning rods more flexible.

[0021] Optionally, the heating plate includes a plurality of heating rods, which are staggered to form a mesh structure, and the grids of the mesh structure form the filter holes; an electric heating wire is arranged in each of the heating rods, and a power supply component for supplying power to the electric heating wire is provided on the furnace body.

[0022] By adopting the above technical solution, a plurality of heating rods are staggered to form a mesh structure, and the grids of the mesh structure form filter holes for the iron particles to fall through. Since a heating wire is arranged in each heating rod, the power supply supplies power to the heating wire to operate the heating wire, thereby making the heating rod have a high temperature, and the iron particles can be fully heated when passing through the filter holes, thereby preventing the iron particles from carrying unreacted waste acid and falling to the discharge port, which affects the recovery rate of the waste acid.

[0023] Optionally, the liquid inlet pipe is connected to an air inlet pipe, and both the liquid inlet pipe and the air inlet pipe are provided with control valves for controlling the opening and closing of corresponding pipelines.

[0024] By adopting the above technical solution, after a single operation of the equipment is completed, before the equipment is shut down, the liquid inlet pipe is closed through the control on the liquid inlet pipe, the air inlet pipe is opened, and high-pressure gas is introduced into the nozzle through the air inlet pipe. The high-pressure gas enters the nozzle and blows the particles scraped off by the scraper rod into the furnace body, thereby preventing the particles from being retained in the nozzle and affecting the next operation of the equipment.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the waste acid enters the furnace body through the liquid inlet pipe, the waste acid will pass through the swirl holes on the swirl disk. Since the multiple swirl holes are arranged obliquely in the direction toward the inner wall of the nozzle and the cross-sections of the multiple swirl holes on the swirl disk are spiral, the waste acid atomized by the spray gun will be sprayed into the nozzle in a swirl shape. The waste acid sprayed in a swirl shape contacts the rotating shaft and the scraper rod. The rotating shaft and the scraper rod will rotate under the action of the waste acid. During the rotation of the scraper rod, the particles adhered to the inner wall of the nozzle are scraped off to prevent the fixed product particles generated by the reaction of the waste acid at the nozzle from clogging the nozzle, thereby ensuring the recovery efficiency of the waste acid; 2. The nozzle is tilted toward the heating plate. This makes the nozzle tilt downward. The particles scraped by the scraper will automatically fall onto the heating plate under the action of gravity, and then fall to the discharge port through the filter hole, thereby further avoiding the accumulation of particles in the nozzle and causing the nozzle to be blocked; 3. After the waste acid is sprayed out through multiple nozzles, the waste acids will push each other. The cleaning rod will contact with the obliquely sprayed waste acid at the same time and slide under the push of the waste acid. The sliding of the cleaning rod drives the movement of the bristles, thereby cleaning the filter holes to prevent iron particles from clogging the filter holes, which will cause the iron particles to dock on the heating plate and be difficult to fall to the discharge port, thereby affecting the contact between the heating plate and the waste acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a hydrochloric acid recovery and concentration process equipment in an embodiment of the present application; Figure 2 is a cross-sectional schematic diagram of an embodiment of the present application at a first viewing angle; Figure 3 is a schematic cross-sectional view of a nozzle in an embodiment of the present application; Figure 4 is a schematic diagram of the cooperation between the swirl disk and the rotating shaft in the embodiment of the present application; Figure 5 It is a sectional top view of the embodiment of the present application at a second viewing angle.

[0027] Explanation of the accompanying drawings: 1. furnace body; 2. air outlet; 3. discharge port; 4. heating element; 41. heating rod; 42. battery; 5. spray gun; 6. liquid inlet pipe; 7. nozzle; 8. swirl disk; 9. rotating shaft; 10. scraper rod; 11. swirl hole; 12. direct current hole; 13. reinforcing rod; 14. filter hole; 15. cleaning rod; 16. bristles; 17. connecting shaft; 18. connecting ring; 19. air inlet pipe; 20. air outlet pipe; 21. discharge pipe. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] The present application embodiment discloses a hydrochloric acid recovery and concentration process equipment. Figure 1 and Figure 2 The hydrochloric acid recovery and concentration process equipment comprises a furnace body 1, a gas outlet 2 and a material outlet 3 are provided on the furnace body 1, a heating element 4 is provided in the furnace body 1, a spray gun 5 is provided on the furnace body 1, a liquid inlet of the spray gun 5 is connected with a liquid inlet pipe 6, a liquid outlet of the spray gun 5 is connected with a spray pipe 7, the spray pipe 7 passes through the furnace body 1 and one end is located in the furnace body 1; Figure 3 and Figure 4 A swirl disk 8 is arranged in the nozzle 7, and a plurality of swirl holes 11 are opened in the circumferential direction on the swirl disk 8. The plurality of swirl holes 11 are all arranged obliquely in the direction toward the inner wall of the nozzle 7, and the plurality of swirl holes 11 are distributed in a spiral shape on the cross section of the swirl disk 8; a rotating shaft 9 parallel to the axial direction of the nozzle 7 is rotatably arranged on the side of the swirl disk 8 away from the spray gun 5, and a scraper rod 10 for scraping off particles adhering to the inner wall of the nozzle 7 is arranged in the axial direction on the rotating shaft 9.

[0030] Reference Figure 1 and Figure 2 The gas outlet 2 is connected to an gas outlet pipe 20, and the material outlet 3 is connected to a material outlet pipe 21. The gas outlet pipe 20 and the material outlet pipe 21 are both provided with control valves for controlling the on-off of the corresponding pipelines. The liquid inlet pipe 6 is connected to an air inlet pipe 19. The liquid inlet pipe 6 and the air inlet pipe 19 are both provided with control valves for controlling the on-off of the corresponding pipelines. After a single operation of the equipment is completed and before the equipment is shut down, the liquid inlet pipe 6 is closed through the control on the liquid inlet pipe 6, and the air inlet pipe 19 is opened. High-pressure gas is introduced into the nozzle 7 through the air inlet pipe 19. The high-pressure gas enters the nozzle 7 and blows the particles scraped off by the scraper rod 10 into the furnace body 1, thereby preventing the particles from being retained in the nozzle 7, thereby affecting the next operation of the equipment.

[0031] Reference Figure 3 and Figure 4 The swirl disk 8 is provided with a plurality of direct current holes 12, which are parallel to the axial direction of the nozzle 7. A part of the waste acid is ejected through the swirl holes 11 to push the rotating shaft 9 and the scraper 10, and the other part is ejected directly through the direct current holes 12, so that the speed of the waste acid passing through the nozzle 7 is increased. A reinforcing rod 13 is provided between the scraper 10 and the rotating shaft 9, and the reinforcing rod 13 improves the connection strength between the scraper 10 and the rotating shaft 9, thereby improving the stability of the scraper 10 and the rotating shaft 9 during rotation.

[0032] Reference Figure 2 and Figure 5 The heating element 4 includes a heating plate arranged in the furnace body 1, and a filter hole 14 is opened on the heating plate. The discharge port 3, the heating plate, the nozzle 7 and the gas outlet 2 are arranged in sequence from low to high; a plurality of nozzles 7 are arranged along the circumferential direction of the inner wall of the furnace body 1, and the plurality of nozzles 7 are distributed in a spiral shape on the cross section of the furnace body 1, and the plurality of nozzles 7 are arranged obliquely downward in the direction toward the heating plate.

[0033] Since the multiple nozzles 7 are all inclined toward the heating disk, the waste acid will be sprayed directly onto the heating disk through the nozzles 7, and the waste acid can contact the heating disk in time and quickly for heating reaction. Moreover, since the multiple nozzles 7 are spirally arranged on the cross section of the furnace body 1, the waste acid sprayed through different nozzles 7 will produce mutual push, and the fluidity of the waste acid in the furnace body 1 is improved, which is conducive to the contact between the waste acid and the heating disk for full reaction; the iron particles generated by the contact reaction between the waste acid and the heating disk will fall downward through the filter holes 14, and the iron particles will be discharged through the discharge port 3 under the action of gravity, while the hydrochloric acid vapor will move upward due to the heat and be discharged through the gas outlet 2, which is conducive to the separation of the iron particles and the hydrochloric acid vapor.

[0034] Reference Figure 2 and Figure 5 The heating plate includes a plurality of heating rods 41, which are staggered to form a mesh structure, and the mesh of the mesh structure forms a filter hole 14; each heating rod 41 is provided with a heating wire, and a power supply component for supplying power to the heating wire is provided on the furnace body 1. The plurality of heating rods 41 are staggered to form a mesh structure, and the mesh of the mesh structure forms a filter hole 14 for the iron particles to fall through. Since each heating rod 41 is provided with a heating wire, the power supply component supplies power to the heating wire to make the heating wire operate, thereby making the heating rod 41 have a high temperature, and the iron particles can be fully heated when passing through the filter hole 14.

[0035] In the embodiment of the present application, the power supply is a battery 42 electrically connected to the heating wire.

[0036] Reference Figure 2 and Figure 5 A connecting shaft 17 is provided on the heating plate, and a connecting ring 18 is rotatably connected to the connecting shaft 17. A limiting ring groove (not shown in the figure) is provided on the connecting shaft 17 to prevent the connecting ring 18 from being separated. The inner wall of the connecting ring 18 is in contact with the groove wall of the limiting ring groove and is located in the limiting ring groove for rotation. A ball (not shown in the figure) is provided on the connecting ring 18 to contact the groove wall of the limiting ring groove. The rotation of the connecting ring 18 drives the ball to roll, so that the rotation flexibility of the connecting ring 18 is improved.

[0037] Reference Figure 2 and Figure 5A plurality of cleaning rods 15 are fixed along the circumferential direction on the outer wall of the connecting ring 18, and a brush 16 is fixed on the lower surface of each cleaning rod 15, and the brush 16 is inserted into the filter hole 14. After the waste acid is sprayed out through the plurality of nozzles 7, the waste acid will push each other, and the cleaning rod 15 will contact the obliquely sprayed waste acid at the same time and slide under the push of the waste acid. The sliding of the cleaning rod 15 drives the movement of the brush 16, thereby cleaning the filter hole 14, preventing the iron particles from blocking the filter hole 14, and then causing the iron particles to dock on the heating plate and be difficult to fall to the discharge port 3.

[0038] The implementation principle of a hydrochloric acid recovery and concentration process equipment in the embodiment of the present application is as follows: waste acid enters the spray gun 5 through the liquid inlet pipe 6, and the spray gun 5 sprays the waste acid into the furnace body 1 in atomized form. Under the action of the heating element 4, the waste acid is heated and reacted in the furnace body 1 to produce iron particles and hydrochloric acid vapor. The iron particles are subsequently discharged through the discharge port 3, and the hydrochloric acid vapor is discharged through the gas outlet 2 to be reused. Since the liquid sprayed from the spray gun 5 enters the furnace body 1 through the nozzle 7, the waste hydrochloric acid is prevented from reacting directly at the spray gun 5 to produce fixed product particles. In the process of the waste acid entering the furnace body 1 through the nozzle 7, the waste acid will pass through the nozzle 7. The swirl holes 11 on the swirl disk 8 are inclined in the direction toward the inner wall of the nozzle 7 and the cross-sections of the swirl holes 11 on the swirl disk 8 are spiral, so that the waste acid atomized by the spray gun 5 will be sprayed into the nozzle 7 in a swirl shape. The waste acid sprayed in a swirl shape contacts the rotating shaft 9 and the scraper rod 10. The rotating shaft 9 and the scraper rod 10 will rotate under the action of the waste acid. During the rotation of the scraper rod 10, the particles adhered to the inner wall of the nozzle 7 are scraped off to prevent the fixed product particles generated by the reaction of the waste acid at the nozzle 7 from clogging the nozzle 7, thereby ensuring the recovery efficiency of the waste acid.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydrochloric acid recovery and concentration process equipment, characterized in that: The invention comprises a furnace body (1), wherein the furnace body (1) is provided with an air outlet (2) and a material outlet (3), wherein a heating element (4) is arranged inside the furnace body (1), wherein a spray gun (5) is arranged on the furnace body (1), wherein a liquid inlet of the spray gun (5) is connected to a liquid inlet pipe (6), wherein a liquid outlet of the spray gun (5) is connected to a spray pipe (7), wherein the spray pipe (7) passes through the furnace body (1) and has one end located inside the furnace body (1); wherein a swirl disk (8) is arranged inside the spray pipe (7), wherein the swirl disk (8) ) is provided with a plurality of swirl holes (11) along the circumferential direction, the plurality of swirl holes (11) are all arranged obliquely in the direction toward the inner wall of the nozzle (7), and the plurality of swirl holes (11) are distributed in a spiral shape on the cross section of the swirl disk (8); the swirl disk (8) is provided with a rotating shaft (9) parallel to the axial direction of the nozzle (7) on the side away from the spray gun (5), and a scraper rod (10) is provided on the rotating shaft (9) along the axial direction for scraping off particles adhering to the inner wall of the nozzle (7).

2. A hydrochloric acid recovery and concentration process equipment according to claim 1, characterized in that: The swirl disk (8) is provided with a plurality of direct flow holes (12), and the direct flow holes (12) are axially parallel to the nozzle (7).

3. A hydrochloric acid recovery and concentration process equipment according to claim 1, characterized in that: A reinforcing rod (13) is provided between the scraper rod (10) and the rotating shaft (9).

4. A hydrochloric acid recovery and concentration process equipment according to claim 1, characterized in that: The heating element (4) comprises a heating plate arranged in the furnace body (1), the heating plate is provided with a filter hole (14), the discharge port (3), the heating plate, the nozzle (7) and the air outlet (2) are arranged in sequence from low to high, and the nozzle (7) is arranged to be inclined in a direction toward the heating plate.

5. A hydrochloric acid recovery and concentration process equipment according to claim 4, characterized in that: A plurality of nozzles (7) are arranged on the inner wall of the furnace body (1) along the circumferential direction, and the plurality of nozzles (7) are distributed in a spiral shape on the cross section of the furnace body (1).

6. A hydrochloric acid recovery and concentration process equipment according to claim 5, characterized in that: A cleaning rod (15) is slidably arranged on the heating plate, and bristles (16) are arranged on the cleaning rod (15), and the bristles (16) are inserted into the filter holes (14).

7. A hydrochloric acid recovery and concentration process equipment according to claim 6, characterized in that: The heating plate is provided with a connecting shaft (17), the connecting shaft (17) is rotatably connected with a connecting ring (18), the connecting ring (18) is provided with a ball that contacts the connecting shaft (17), and a plurality of cleaning rods (15) are provided, and the plurality of cleaning rods (15) are all connected to the cleaning rod (15).

8. A hydrochloric acid recovery and concentration process equipment according to claim 4, characterized in that: The heating plate comprises a plurality of heating rods (41), the heating rods (41) being arranged in a staggered manner to form a mesh structure, the meshes of the mesh structure forming the filter holes (14); an electric heating wire is arranged in each of the heating rods (41), and a power supply component for supplying power to the electric heating wire is arranged on the furnace body (1).

9. The hydrochloric acid recovery and concentration process equipment according to claim 1, characterized in that: The liquid inlet pipe (6) is connected to an air inlet pipe (19), and both the liquid inlet pipe (6) and the air inlet pipe (19) are provided with control valves for controlling the opening and closing of corresponding pipelines.

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