Caustic soda product evaporation and concentration device

Abstract

A caustic soda product evaporation and concentration device relates to the technical field of caustic soda evaporation and concentration and is characterized in that an evaporation tank is divided into a heating cavity, a steam cavity and an evaporation cavity by arranging a cooling box, steam generated by the evaporation tank enters the cooling box and is cooled to form water, and liquefied water flows back to the heating cavity through a pipeline; the heating cavity generates steam again by heating liquefied water, the caustic soda solution in the evaporation cavity is evaporated and liquefied by utilizing the steam to flow through the steam cavity and the evaporation cavity, and the caustic soda solution is heated by utilizing the steam instead of being directly heated by the heating pipe, so that the heating pipe is protected, and the generation efficiency of scale on the heating pipe is also reduced; in addition, due to the fact that steam generated by the evaporation tank is cooled into water and then evaporated again, entrainment in the steam can be reduced, and the purity of the water in the steam is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of caustic soda evaporation and concentration, and particularly relates to an evaporation and concentration device for caustic soda products. Background Art

[0002] Caustic soda, as an important basic raw material, has a wide range of downstream applications, mainly including papermaking, textile, chemical industry, medicine, metallurgy, electroplating, water treatment, and tail gas treatment. During the production and processing of caustic soda, in order to increase the concentration of caustic soda, it is necessary to continuously evaporate and concentrate the caustic soda solution;

[0003] When evaporating and concentrating caustic soda, as the solvent water in the caustic soda solution evaporates, it is inevitable that the solute in the solution will precipitate and crystallize. The crystals adsorb on the heating tubes that heat the caustic soda solution. As the thickness of the crystals increases, it is not easy to clean, which will greatly reduce the heat exchange efficiency of the heating tubes. Moreover, the heating tubes are in direct contact with the caustic soda solution, and long-term use will corrode and damage the electronic components in the heating tubes, reducing the service life of the heating tubes. Summary of the Invention

[0004] What the present invention needs to overcome is the problem that in the evaporation and concentration device, the heating tubes are in direct contact with the caustic soda solution, the crystals generated on the surface are not easy to clean, and it is easy to corrode the electronic components in the heating tubes, affecting the service life of the heating tubes. The purpose is to provide an evaporation and concentration device for caustic soda products.

[0005] The technical problems to be solved by the present invention are realized by adopting the following technical solutions:

[0006] An evaporation and concentration device for caustic soda products, comprising: an evaporation tank, a cooling box, and a calcining furnace;

[0007] The upper part of the cooling box is provided with an exhaust port, the bottom is provided with a condensation tank, and a caustic soda tank is arranged inside the cooling box. The upper part of the caustic soda tank extends out of the cooling box and is provided with a feed port;

[0008] The evaporation tank internally is provided with a heating chamber, a steam chamber, and an evaporation chamber. The three chambers are respectively separated by partition plates. Heating tubes are arranged in the heating chamber. The heating chamber is connected to the condensation tank through a pipeline. A concentrated liquid outlet is arranged on the side of the evaporation chamber, and the concentrated liquid outlet is connected to the feed port of the calcining furnace. The heating chamber is communicated with the steam chamber through a pipeline. A steam driving mechanism is arranged inside the steam chamber, and a driving gear is installed on the partition plate at the upper part of the steam chamber. The driving gear is driven to rotate by the steam driving mechanism;

[0009] A steam outlet is provided at the upper part of the evaporation chamber. The steam outlet is connected to a cooling tank through a pipeline. A caustic soda hopper is installed inside the evaporation chamber. The caustic soda hopper is connected to a caustic soda tank through a pipeline. A blanking port is provided at the bottom of the caustic soda hopper. A rotating ring is installed at the blanking port. A support spring is installed on the caustic soda hopper. A mounting disk is installed on the support spring. A steam pipe is fixed on the mounting disk. A driven ring is rotatably installed on the partition board at the upper part of the steam chamber. The steam pipe passes through the rotating ring and the driven ring and is inserted into the steam chamber. A scraping plate is provided between the rotating ring and the driven ring. The driven ring is connected to a driving gear in a gear meshing manner.

[0010] Further, a material guiding sleeve is provided at the blanking port. The material guiding sleeve is sleeved outside the steam pipe. A gap is left between the material guiding sleeve and the steam pipe.

[0011] Further, an installation groove is provided on the rotating ring. The upper end of the scraping plate is located in the installation groove. A first tension spring is provided between the scraping plate and the end of the installation groove. The upper part of the mounting disk is a conical inclined surface. An adjusting screw is installed on the side of the evaporation tank by means of threads. A pressing block is provided at the end of the adjusting screw. The pressing block contacts the conical inclined surface at the upper part of the mounting disk. A top column is fixed on the mounting disk. The lower end of the top column passes through the caustic soda hopper and is connected to a pressing ring. The inner ring side of the pressing ring is an inclined cutting surface. A cross bar is provided on the side of the scraping plate. The end of the cross bar contacts the inclined cutting surface of the inner ring of the pressing ring. A guiding groove is provided inside the driven ring. The lower end of the scraping plate is located in the guiding groove. A second tension spring is provided between the lower end of the scraping plate and the end of the guiding groove.

[0012] Further, both the first tension spring and the second tension spring apply a force to the scraping plate in a direction away from the steam pipe.

[0013] Further, the installation groove on the scraping plate and the guiding groove on the driven ring are both arranged along the radial direction of the steam pipe. The groove depth of the guiding groove at the end close to the steam pipe is greater than the groove depth at the end far from the steam pipe, and a slope surface is formed between the two ends.

[0014] Further, the steam chamber is connected to a heating chamber through a pipeline. A discharge port is provided on the side of the heating chamber.

[0015] Further, the caustic soda hopper is connected to the caustic soda tank through a caustic soda pipe. The steam outlet is connected to the cooling tank through a steam connection pipe. The caustic soda pipe and the steam connection pipe are coaxially arranged and are located inside the steam connection pipe.

[0016] Further, the steam driving mechanism includes a rotating pipe and a steam spray pipe. The rotating pipe is rotatably installed on the partition board at the upper part of the heating chamber. The upper end of the rotating pipe is inserted into the evaporation chamber. The steam spray pipes are arranged at equal angles in a matrix pattern at the upper end of the rotating pipe. The steam generated by the heating chamber is guided by a conduit and is ejected from the steam spray pipes along a direction parallel to the tangent of the conduit.

[0017] The beneficial effects of the present invention are as follows:

[0018] By providing a cooling tank, the evaporation tank is configured into three chamber structures: a heating chamber, a steam chamber, and an evaporation chamber. The steam generated by the evaporation tank enters the cooling tank to be cooled and liquefied into water, and the liquefied water flows back to the heating chamber through a pipeline. The heating chamber reheats the liquefied water to generate steam again. The steam flows through the steam chamber and the evaporation chamber to evaporate the caustic soda solution in the evaporation chamber. The concentrated solution after the evaporation of the caustic soda then flows into the calcining furnace through the concentrated material outlet for final crystallization. Before entering the calcining furnace, a large amount of water in the caustic soda solution is removed through the treatment of the evaporation tank, which improves the crystallization efficiency of the caustic soda solution in the calcining furnace. In the evaporation tank, the steam is used to heat the caustic soda solution instead of directly heating the caustic soda solution with a heating tube, which protects the heating tube and reduces the generation efficiency of scale on the heating tube, thereby increasing the maintenance period. Moreover, since the steam generated by the evaporation tank is cooled into water and then evaporated again, the entrainment of mist in the steam can also be reduced, and the purity of water in the steam is increased;

[0019] By adjusting the screw rod to press the pressure block, which acts on the conical inclined surface of the mounting plate, driving the mounting plate to move, and then driving the ejector pin and the pressing ring to move. The pressing ring is used to squeeze the cross bar to push the scraper into contact with the outer wall of the steam pipe, thereby cleaning the crystals on the steam pipe. When cleaning is not required, the scraper can also be kept separated from the steam pipe. When the amount of crystals on the steam pipe is small, the influence of the scraper on the caustic soda solution flowing through the steam pipe can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of the evaporation tank of the present invention;

[0022] Figure 3 is a schematic structural diagram of the cooling tank of the present invention;

[0023] Figure 4 is a schematic installation diagram of the steam pipe of the present invention;

[0024] Figure 5 of the present invention Figure 4 is an enlarged view of part A;

[0025] Figure 6 is a schematic structural diagram of the steam driving mechanism of the present invention;

[0026] In the figure: 1. Evaporation tank; 2. Cooling box; 3. Calcining furnace; 12. Exhaust port; 13. Condensation tank; 14. Caustic soda tank; 15. Feed port; 21. Heating chamber; 22. Steam chamber; 23. Evaporation chamber; 24. Partition board; 25. Steam outlet; 31. Heating pipe; 32. Concentrated liquid outlet; 33. Steam driving mechanism; 34. Driving gear; 35. Caustic soda hopper; 36. Feeding port; 37. Rotating ring; 38. Support spring; 49. Mounting plate; 41. Steam pipe; 42. Driven ring; 43. Scraper; 51. Material guiding sleeve; 52. Mounting groove; 53. First tension spring; 54. Adjusting screw; 55. Pressing block; 56. Jacking column; 57. Pressing ring; 58. Cross bar; 59. Guide groove; 60. Second tension spring; 61. Discharge port; 62. Water adding port; 63. Throttle valve; 64. Caustic soda pipe; 65. Steam connecting pipe; 71. Rotating pipe; 72. Steam spray pipe. Detailed implementation mode

[0027] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0028] Embodiment 1

[0029] As Figures 1-6 shown, a caustic soda product evaporation and concentration device includes: an evaporation tank 1, a cooling box 2, and a calcining furnace 3;

[0030] The upper part of the cooling box 2 is provided with an exhaust port 12, the bottom is provided with a condensation tank 13, the inside of the cooling box 2 is provided with a caustic soda tank 14, and the upper part of the caustic soda tank 14 extends out of the cooling box 2 and is provided with a feed port 15;

[0031] The inside of the evaporation tank 1 is provided with a heating chamber 21, a steam chamber 22, and an evaporation chamber 23. Partition boards 24 are respectively arranged between the three chambers for isolation. A heating pipe 31 is arranged in the heating chamber 21. The heating chamber 21 is connected to the condensation tank 13 through a pipeline. A delivery pump is installed on the pipeline connecting the heating chamber 21 and the condensation tank 13. The condensate water in the condensation tank 13 is delivered to the heating chamber 21 by the delivery pump. The side of the evaporation chamber 23 is provided with a concentrated liquid outlet 32, and the concentrated liquid outlet 32 is connected to the feed port of the calcining furnace 3. The heating chamber 21 is communicated with the steam chamber 22 through a pipeline. A steam driving mechanism 33 is arranged inside the steam chamber 22. A driving gear 34 is installed on the partition board 24 at the upper part of the steam chamber 22, and the driving gear 34 is driven to rotate by the steam driving mechanism 33;

[0032] A steam outlet 25 is provided at the upper part of the evaporation chamber 23. The steam outlet 25 is connected to the cooling tank 2 through a pipeline. A caustic soda hopper 35 is installed inside the evaporation chamber 23. The caustic soda hopper 35 is connected to the caustic soda tank 14 through a pipeline. A blanking port 36 is provided at the bottom of the caustic soda hopper 35. A rotating ring 37 is installed at the blanking port 36. A support spring 38 is installed on the caustic soda hopper 35. A mounting disc 49 is installed on the support spring 38. A steam pipe 41 is fixed on the mounting disc 49. A driven ring 42 is rotatably installed on the partition plate 24 at the upper part of the steam chamber 22. The steam pipe 41 passes through the rotating ring 37 and the driven ring 42 and is inserted into the steam chamber 22. A scraping plate 43 is provided between the rotating ring 37 and the driven ring 42. The driven ring 42 is connected to the driving gear 34 in a gear meshing manner;

[0033] The steam driving mechanism 33 includes a rotating pipe 71 and a steam spray pipe 72. The rotating pipe 71 is rotatably installed on the partition plate 24 at the upper part of the heating chamber 21. The upper end of the rotating pipe 71 is inserted into the evaporation chamber 23. The steam spray pipes 72 are arranged in an equiangular matrix at the upper end of the rotating pipe 71. The steam generated in the heating chamber 21 is guided by a conduit and ejected from the steam spray pipes 72 along the tangential direction parallel to the conduit. The steam generated by the heating water in the heating chamber 21 is sprayed into the steam chamber 22 through the steam spray pipes 72 on the rotating pipe 71. As the gas is ejected from the steam spray pipes 72 along the direction parallel to the outer tangent plane of the rotating pipe 71, it will drive the rotating pipe 71 to rotate. When the rotating pipe 71 rotates, it drives the driving gear 34 to rotate through a gear connection method, thus providing power for the rotation of the driven ring 42;

[0034] A material guiding sleeve 51 is provided at the blanking port 36. The material guiding sleeve 51 is sleeved outside the steam pipe 41. A gap is left between the material guiding sleeve 51 and the steam pipe 41;

[0035] The caustic soda solution enters the caustic soda tank 14 through the feed port 15 and is cached in the caustic soda tank 14. The steam generated in the evaporation tank 1 is introduced into the cooling box 2 through a pipeline. When the steam contacts the outer wall of the caustic soda tank 14, it will liquefy upon cooling. The water generated by the liquefied steam will fall into the condensate tank 13 at the bottom of the cooling box 2 and is introduced into the evaporation chamber 23 through the pipeline at the bottom of the condensate tank 13. The heating pipe 31 in the evaporation chamber 23 will reheat and evaporate the water, and the generated steam enters the steam pipe 41 from the steam chamber 22. The caustic soda in the caustic soda tank 14 is transported to the caustic soda hopper 35 through a pipeline and flows out through the gap between the blanking port 36 at the bottom of the caustic soda hopper 35 and the steam pipe 41, and falls along the outer wall of the steam pipe 41. During the falling process, under the heating of the steam in the steam pipe 41, the solvent in the caustic soda solution evaporates, the solute crystallizes, and the water vapor in the solution flows out from the steam outlet 25 at the upper part of the evaporation chamber 23 and is then introduced into the cooling box 2 through a pipeline. The steam driving mechanism 33 in the steam chamber 22 drives the driving gear 34 to rotate, which in turn drives the driven ring 42 to rotate. When the driven ring 42 rotates, it drives the scraper 43 to rotate on the outer wall of the steam pipe 41 to scrape the outer wall of the steam pipe 41 and clean the crystals on the outer wall of the steam pipe 41, avoiding excessive crystallization from affecting the heating effect of the steam pipe 41. During the whole process, the water obtained by heating and condensing the steam in the heating chamber 21 is reheated to obtain steam, and the steam is used to heat the caustic soda solution instead of directly heating the caustic soda solution by the heating pipe 31, thus protecting the heating pipe 31 and reducing the scale generation efficiency on the heating pipe 31, thereby increasing the maintenance period. Moreover, since the steam generated by the evaporation tank 1 is cooled into water and then reheated, it can also reduce the entrainment of mist in the steam and increase the purity of the water in the steam;

[0036] The evaporation tank 1 is used to evaporate a large amount of water in the caustic soda solution, and the obtained concentrated solution then enters the calcination furnace 3. After being calcined in the calcination furnace 3, caustic soda crystals are obtained, and the crystallized caustic soda crystals are discharged from the outlet of the calcination furnace 3;

[0037] A concentrated solution outlet 32 is provided on the side of the evaporation chamber 23, and the evaporated and concentrated caustic soda solution will flow out from the concentrated solution outlet 32. To improve the concentration rate, multiple evaporation tanks 1 and cooling boxes 2 can also be connected in series. The concentrated solution outlet 32 on the first evaporation tank 1 is connected to the feed port 15 on the cooling box 2, and the caustic soda tank 14 on the cooling box 2 is connected to the caustic soda hopper 35 on another evaporation tank 1 through a pipeline, so as to achieve multi-stage evaporation and concentration, improve the concentration of the concentrated solution entering the calcination furnace 3, and improve the crystallization efficiency in the calcination furnace 3.

[0038] Example 2

[0039] Based on Example 1, as Figure 2 、 Figure 4 、 Figure 5As shown in the figure, the swivel ring 37 is provided with an installation groove 52. The upper end of the scraper 43 is located in the installation groove 52. A first tension spring 53 is provided between the scraper 43 and the end of the installation groove 52. The upper part of the installation disk 49 is a conical inclined surface. The side of the evaporation tank 1 is installed with an adjusting screw rod 54 through threads. The end of the adjusting screw rod 54 is provided with a pressing block 55. The pressing block 55 contacts the conical inclined surface of the upper part of the installation disk 49. A top column 56 is fixed on the installation disk 49. The lower end of the top column 56 passes through the caustic soda hopper 35 and is connected with a pressing ring 57. The inner ring side of the pressing ring 57 is an inclined cut surface. A cross bar 58 is provided on the side of the scraper 43. The end of the cross bar 58 contacts the inclined cut surface of the inner ring of the pressing ring 57. A guide groove 59 is provided inside the driven ring 42. The lower end of the scraper 43 is located in the guide groove 59. A second tension spring 60 is provided between the lower end of the scraper 43 and the end of the guide groove 59;

[0040] Both the first tension spring 53 and the second tension spring 60 exert a force on the scraper 43 in a direction away from the steam pipe 41;

[0041] The installation groove 52 on the scraper 43 and the guide groove 59 on the driven ring 42 are both arranged along the radial direction of the steam pipe 41. The groove depth at the end of the guide groove 59 close to the steam pipe 41 is greater than the groove depth at the end away from the steam pipe 41, and a ramp surface is formed between the two ends;

[0042] When it is not necessary to clean the crystals on the outer wall of the steam pipe 41, under the action of the support spring 38, the installation disk 49 drives the ejector rod and the pressing ring 57 to move up to the highest position. At this time, the end of the cross bar 58 is located at the lowest side of the inclined cut surface of the inner ring of the pressing ring 57. The scraper 43 connected to the cross bar 58 is separated from the steam pipe 41 under the action of the first tension spring 53 and the second tension spring 60. As the driven ring 42 rotates, it drives the scraper 43 to move around the outer wall of the steam pipe 41. When the scraper 43 moves, it can accelerate the gas flow on the outer wall of the steam pipe 41. Thus, the evaporation efficiency of the caustic soda solution passing through the steam pipe 41 can be increased. Moreover, when the crystal amount on the steam pipe 41 is not much, the separation of the scraper 43 from the steam pipe 41 can also reduce the influence of the scraper 43 on the flowing caustic soda solution on the steam pipe 41 and avoid the splashing of the caustic soda solution in the evaporation chamber 23;

[0043] When it is necessary to clean the crystals on the outer wall of the steam pipe 41, by rotating the adjusting screw rod 54, the adjusting screw rod 54 is used to squeeze the pressing block 55. The pressing block 55 exerts a force on the conical inclined surface of the installation disk 49 in the horizontal direction, and then pushes the whole installation disk 49 to move down. As the installation disk 49 moves down, it drives the ejector rod to push the pressing ring 57 to move down. When the pressing ring 57 moves down, the inclined cut surface on the inner ring side of the pressing ring 57 squeezes the cross bar 58 inward, and then the scraper 43 connected to the cross bar 58 moves toward the steam pipe 41. When the scraper 43 contacts the crystals on the outer wall of the steam pipe 41, it can clean the crystals.

[0044] Embodiment 3

[0045] Based on Embodiment 1, as Figure 1 , Figure 2 , Figure 3 shown, the steam chamber 22 is connected to the heating chamber 21 through a pipeline. A delivery pump is provided on the pipeline connecting the steam chamber 22 and the heating chamber 21. The water generated by liquefying the steam in the steam chamber 22 is re-introduced into the heating chamber 21 by using the delivery pump. A discharge port 61 is provided on the side of the heating chamber 21. When the evaporation and concentration operation of the caustic soda solution is completed, the remaining water in the heating chamber 21 can be discharged through the discharge port 61, which is convenient for maintaining the heating chamber 21. A water filling port 62 is provided on the side of the heating chamber 21 for temporarily supplementing pure water;

[0046] The caustic soda hopper 35 is connected to the caustic soda tank 14 through a caustic soda pipe 64. A throttle valve 63 is installed on the caustic soda pipe 64 to control the amount of caustic soda solution entering the caustic soda hopper 35. The steam outlet 25 is connected to the cooling box 2 through a steam connecting pipe 65. The caustic soda pipe 64 and the steam connecting pipe 65 are coaxially arranged and located inside the steam connecting pipe 65. The steam flowing out of the evaporation chamber 23 exchanges heat with the caustic soda solution entering the caustic soda hopper 35. On the one hand, it can preheat the solution flowing into the caustic soda hopper 35, and on the other hand, it can absorb the heat in the steam and accelerate the liquefaction of the steam.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An evaporation and concentration device for caustic soda products, characterized in that, Including: An evaporation tank, a cooling box, and a calcining furnace; An exhaust port is provided at the upper part of the cooling box, a condensation tank is provided at the bottom, a caustic soda tank is provided inside the cooling box, and a feed port extends out of the cooling box at the upper part of the caustic soda tank; A heating chamber, a steam chamber, and an evaporation chamber are provided inside the evaporation tank. Partition plates are respectively arranged between the three chambers for isolation. Heating pipes are provided in the heating chamber. The heating chamber is connected to the condensation tank through a pipeline. A concentrated liquid outlet is provided at the side of the evaporation chamber, and the concentrated liquid outlet is connected to the feed port of the calcining furnace. The heating chamber is communicated with the steam chamber through a pipeline. A steam driving mechanism is provided inside the steam chamber, and a driving gear is installed on the partition plate at the upper part of the steam chamber. The driving gear is driven to rotate by the steam driving mechanism; A steam outlet is provided at the upper part of the evaporation chamber. The steam outlet is connected to the cooling box through a pipeline. A caustic soda hopper is installed inside the evaporation chamber. The caustic soda hopper is connected to the caustic soda tank through a pipeline. A blanking port is provided at the bottom of the caustic soda hopper. A rotating ring is installed at the blanking port. A support spring is installed on the caustic soda hopper. A mounting disk is installed on the support spring. A steam pipe is fixed on the mounting disk. A driven ring is rotatably installed on the partition plate at the upper part of the steam chamber. The steam pipe passes through the rotating ring and the driven ring and is inserted into the steam chamber. A scraping plate is provided between the rotating ring and the driven ring. The driven ring is connected to the driving gear in a gear meshing manner.

2. The evaporation and concentration device for caustic soda products according to claim 1, characterized in that, A guiding sleeve is provided at the blanking port. The guiding sleeve is sleeved outside the steam pipe, and a gap is left between the guiding sleeve and the steam pipe.

3. The evaporation and concentration device for caustic soda products according to claim 1, wherein An installation groove is provided on the rotating ring. The upper end of the scraping plate is located in the installation groove. A first tension spring is provided between the scraping plate and the end of the installation groove. The upper part of the mounting disk is a conical inclined surface. An adjusting screw is installed on the side of the evaporation tank by means of threads. A pressing block is provided at the end of the adjusting screw. The pressing block contacts the conical inclined surface of the upper part of the mounting disk. A jacking column is fixed on the mounting disk. The lower end of the jacking column passes through the caustic soda hopper and is connected to a pressing ring. The inner ring side of the pressing ring is an inclined cut surface. A cross bar is provided on the side of the scraping plate. The end of the cross bar contacts the inclined cut surface of the inner ring of the pressing ring. A guiding groove is provided inside the driven ring. The lower end of the scraping plate is located in the guiding groove. A second tension spring is provided between the lower end of the scraping plate and the end of the guiding groove.

4. The evaporation and concentration device for caustic soda products according to claim 3, characterized in that, Both the first tension spring and the second tension spring apply a force to the scraping plate in a direction away from the steam pipe.

5. The evaporation and concentration device for caustic soda product according to claim 3, characterized in that, The installation groove on the scraping plate and the guiding groove on the driven ring are both arranged along the radial direction of the steam pipe. The groove depth of the guiding groove at the end close to the steam pipe is greater than the groove depth at the end far from the steam pipe, and a slope surface is formed between the two ends.

6. The evaporation and concentration device for caustic soda products according to claim 1, wherein The steam chamber is connected to the heating chamber through a pipeline, and a discharge port is provided at the side of the heating chamber.

7. The evaporation and concentration device for caustic soda products according to claim 1, wherein, The caustic soda hopper is connected to the caustic soda tank through a caustic soda pipe, and the steam outlet is connected to the cooling box through a steam connection pipe. The caustic soda pipe and the steam connection pipe are coaxially arranged and are located inside the steam connection pipe.

8. The evaporation and concentration device for caustic soda products according to claim 1, characterized in that, The steam driving mechanism includes a rotating pipe and a steam spray pipe. The rotating pipe is rotatably installed on the partition plate at the upper part of the heating chamber. The upper end of the rotating pipe is inserted into the evaporation chamber. The steam spray pipes are arranged at equal angles in a matrix pattern at the upper end of the rotating pipe. The steam generated in the heating chamber is guided by a conduit and ejected from the steam spray pipes along a direction parallel to the tangent of the conduit.

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