Dryer for salt production

Abstract

The present application belongs to the field of salt making equipment, and proposes a drying furnace medium-pressure steam utilization device for salt making, which comprises a raw material tank, a steam generating device, a concurrent multi-effect evaporation system and a preheating tank. The steam generating device comprises a medium-pressure output side, which is provided with a dry flow pipe, a main branch pipe and a plurality of branch pipes. The dry flow pipe is connected with the heating steam inlet of the 1st evaporator. The branch pipes are in one-to-one correspondence with a plurality of secondary steam pipes. The output ends of the branch pipes and the secondary steam pipes are arranged on a steam mixer. A rotating column tube type inner core in the steam mixer is used to uniformly mix the medium-pressure steam and the secondary steam. The output end of the steam mixer is provided with a mixed steam pipe, which is connected with the heating steam inlet of the n-1st evaporator of the concurrent multi-effect evaporation system. The present application is reasonable in design, can utilize the medium-pressure steam to drive the salt making process temperature control and efficiency improvement, improves the utilization rate of the medium-pressure steam, is beneficial to ensuring the salt making quality, and is suitable for large-scale promotion.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of salt making equipment, and particularly relates to a drying furnace medium-pressure steam utilization device for salt making. BACKGROUND

[0002] Temperature control in the salt making process runs through the whole process of dissolution, evaporation, crystallization and drying, and the core goal is to balance production efficiency, product quality and energy cost. By accurately controlling the temperature of each link, uniform salt crystal particles, standard purity, and reduced energy consumption and impurity pollution risk can be achieved. Different processes need to develop individualized temperature control programs according to the characteristics of raw materials and product requirements (such as edible salt and industrial salt), and dynamic adjustment can be realized in combination with automatic control systems (such as PLC and DCS).

[0003] At present, the medium-pressure steam in the salt making process is generally used for one-effect heating evaporation, and the heating source in the heater of the next effect is the secondary steam generated from the previous effect heater. For the condensate generated in the one-effect heating evaporator, it is mostly used for preheating the material. Since the heating temperature of the secondary steam as the heating source greatly depends on the pressure and temperature of the previous effect heater, the temperature fluctuation range is large, although it can also evaporate part of the water in the brine, but the evaporation efficiency is not high.

[0004] The existing patent CN202311428554.7 discloses a multi-effect desalination system, which adopts a method of mixing medium-pressure steam and secondary steam to heat the brine in the one-effect evaporator, but does not consider the temperature control of the heating source in the remaining effect evaporator, so the actual temperature control effect of the system needs to be improved to improve the efficiency of salt making. SUMMARY

[0005] The present application is directed to the technical problems existing in the above-mentioned salt making system, and proposes a drying furnace medium-pressure steam utilization device for salt making, which is reasonable in design and can utilize medium-pressure steam to drive the temperature control of the salt making process.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is as follows: the present application provides a drying furnace pressure steam utilization device for salt making, which comprises a raw material tank, a steam generating device and a concurrent multi-effect evaporation system, the output side of the condensate water of the concurrent multi-effect evaporation system is provided with a preheating tank, the feed inlet side and the feed outlet side of the preheating tank are connected with the raw material tank and the 1st evaporator of the concurrent multi-effect evaporation system respectively, the steam generating device comprises a medium pressure output side, the medium pressure output side is provided with a dry flow pipe and a main branch pipe, the dry flow pipe is connected with the heating steam inlet of the 1st evaporator, a plurality of branch pipes are arranged on the main branch pipe, the branch pipes correspond to a plurality of secondary steam pipes of the concurrent multi-effect evaporation system one by one, the branch pipes and the output ends of the secondary steam pipes are all arranged on a steam mixer, a rotating column tube type inner core is arranged in the steam mixer, the rotating column tube type inner core is used for uniformly mixing medium pressure steam and secondary steam, a mixed steam pipe is arranged at the output end of the steam mixer, and the mixed steam pipe is connected with the heating steam inlet of the n-1 evaporator of the concurrent multi-effect evaporation system.

[0007] As a preferred, the steam mixer comprises a body, a medium pressure steam interface is arranged at the top of the body, a medium pressure steam buffer cavity is arranged below the medium pressure steam interface, a secondary steam receiving tank is arranged at the bottom of the body, a secondary steam buffer cavity is arranged at the inner side of the secondary steam receiving tank, and a steam outlet buffer cavity is arranged at the inner side of the body and nested with the rotating column tube type inner core.

[0008] As a preferred, the rotating column tube type inner core comprises a rotating cover, the medium pressure steam buffer cavity is arranged in a tapered manner in the inner part of the rotating cover, a hole plate and a shell side body are arranged at the inner part and the bottom of the rotating cover respectively, a plurality of column tubes corresponding to the hole positions on the hole plate and located in the inner part of the shell side body are arranged at the bottom of the hole plate, the bottom end of the column tube is a plug end, the column tube is a flat cylindrical shape and comprises two end arc surfaces and two side arc surfaces, the length of the side arc surface is greater than the length of the end arc surface, and the two side arc surfaces are distributed in a hyperbolic manner, the side arc surfaces of different rows of column tubes are distributed in a staggered manner, folding type mixing gaps are formed between the column tubes, a steam outlet pipe is arranged on the shell side body and communicates with the mixing gaps, and a plurality of steam distribution holes are arranged on the side arc surface and distributed along the length direction of the side arc surface.

[0009] As a preferred, the distribution span of the steam distribution hole is less than the length of the column tube and is distributed in the lower half of the shell side body, the steam outlet buffer cavity is distributed in the upper half of the shell side body, the steam outlet pipe is arranged at a position close to the top of the shell side body, and the mixed steam pipe is arranged at a position close to the bottom of the shell side body.

[0010] As preferred, the bottom of the rotating columnar inner core is provided with a secondary steam distribution inner core, which is provided with a plurality of vertical through holes, the distribution density of the vertical through holes is greater than the tube path distribution density of the rotating columnar inner core, and the bottom of the secondary steam distribution inner core is provided with a bracket.

[0011] As preferred, the driving end of the rotating columnar inner core is provided with a driving device, the driving device comprises a worm gear connected with the rotating columnar inner core in synchronization, the driving side of the worm gear is provided with a worm, the power input end of the worm is provided with a speed reducer motor, and the steam mixer is provided with a transmission box for mounting the worm and the speed reducer motor.

[0012] As preferred, the transmission box comprises a fixed box body, the side surface of the fixed box body is provided with a mounting port, two front and rear abutting movable covers are arranged in the mounting port, the movable covers are connected with the fixed box body through bolts, the inside of the movable covers is provided with a shaft hole for mounting the worm, and the speed reducer motor is arranged at the end of one of the movable covers.

[0013] As preferred, the inside of the steam mixer is provided with a plurality of positioning support assemblies arranged in a circular array, the positioning support assemblies comprise support plates, the bottom surface and the side surface of the support plates are matched with the top surface of the worm gear and the side surface of the rotating columnar inner core respectively, the bottom of the support plate is provided with a transverse groove, the transverse groove is provided with a cylindrical roller, the rolling surface of the cylindrical roller is in contact with the top surface of the worm gear, the end of the cylindrical roller is provided with a floating spring, and the floating spring is nested with a positioning column arranged on the inner wall of the steam mixer.

[0014] As preferred, the inner top of the body is provided with a thrust bearing assembly matched with the top of the rotating columnar inner core, the inner side surface of the body is provided with an upper bushing and a lower bushing distributed in an upper and lower interval, the upper bushing and the lower bushing are rotationally matched with the side surface of the rotating columnar inner core, and the side surfaces of the upper bushing and the lower bushing are smooth surfaces.

[0015] As preferred, the lower bushing is nested in the inner wall of the body, the top of the upper bushing is matched with a positioning groove arranged in the inner part of the body, and the bottom of the upper bushing is matched with a thrust plate arranged on the side surface of the rotating columnar inner core.

[0016] Compared with the prior art, the application has the advantages and positive effects that:

[0017] The application provides a drying furnace middle-pressure steam utilization device for salt production, part of the middle-pressure steam is branched and introduced into a mixed steam generator, the middle-pressure steam and secondary steam are uniformly mixed in the mixed steam generator, which is beneficial to obtaining a relatively controllable temperature, the mixed steam after mixing is used for heating brine in a downstream multi-effect evaporation system, which is beneficial to ensuring the concentration efficiency of the brine in the evaporator. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 A schematic view of a drying furnace middle-pressure steam utilization device for salt production provided by the embodiment;

[0020] Figure 2 A perspective view of the mixed steam generator provided by the embodiment;

[0021] Figure 3 A front view of the mixed steam generator provided by the embodiment;

[0022] Figure 4 A sectional view of the mixed steam generator provided by the embodiment;

[0023] Figure 5 A Figure 4 An enlarged schematic view of the middle A structure;

[0024] Figure 6 An exploded view of the mixed steam generator, the secondary steam uniform distribution inner core and the bracket provided by the embodiment;

[0025] Figure 7 A Figure 3 A sectional view of the mixed steam generator in the direction of B-B;

[0026] Figure 8 A perspective view of the driving device provided by the embodiment;

[0027] In the above drawings:

[0028] 1, raw material tank;

[0029] 2, steam generating device;

[0030] 3, downstream multi-effect evaporation system;

[0031] 4, preheating tank;

[0032] 5, medium pressure output side; 51, main flow pipe; 52, main branch pipe; 53, branch pipe;

[0033] 6, secondary steam pipe;

[0034] 7, steam mixer; 71, body; 72, medium pressure steam interface; 73, medium pressure steam buffer cavity; 74, secondary steam receiving bowl; 75, secondary steam buffer cavity; 76, steam outlet buffer cavity; 77, mixed steam pipe; 78, rotating columnar inner core; 781, rotating cover; 782, orifice plate; 783, shell side body; 784, column pipe; 7841, end arc surface; 7842, side arc surface; 7843, steam distribution hole; 785, mixing gap; 786, steam outlet pipe; 79, thrust bearing assembly; 710, upper bushing; 711, lower bushing; 712, positioning groove; 713, thrust plate;

[0035] 8, secondary steam distribution inner core; 81, vertical through hole;

[0036] 9, bracket;

[0037] 10, driving device; 101, worm gear; 102, worm; 103, speed reduction motor; 104, transmission box; 1041, fixed box body; 1042, mounting port; 1043, movable cover; 1044, shaft hole;

[0038] 11, positioning support assembly; 111, support plate; 112, transverse groove; 113, cylindrical roller; 114, floating spring; 115, positioning column. DETAILED DESCRIPTION

[0039] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the following will give further description of the present application with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, the following will appear "up", "down", "left", "right" words, only indicate the same with the upper, lower, left, right direction of the drawing itself, and do not limit the structure.

[0040] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, however, the present application can also be implemented in other ways different from the description herein, therefore, the present application is not limited to the specific embodiments disclosed in the following description.

[0041] Embodiments, such as Figures 1-8As shown, the application provides a drying furnace for salt production, which comprises a raw material tank 1, a steam generating device 2 and a parallel flow type multi-effect evaporation system 3. The output side of the condensate water of the parallel flow type multi-effect evaporation system 3 is provided with a preheating tank 4, and the inlet side and outlet side of the preheating tank 4 are connected with the raw material tank 1 and the 1st evaporator of the parallel flow type multi-effect evaporation system 3 respectively. The steam generating device 2 comprises a medium pressure output side 5. The parallel flow type multi-effect evaporation system 3 comprises 1st evaporator and n-1st evaporator, and the steam output side of each evaporator is provided with a separator. The top of the separator is provided with a secondary steam pipe 6 for outputting secondary steam. The condensate water outlet of the 1st evaporator is connected to the preheating tank 4, and the material in the preheating tank 4 is preheated by heat exchange. The condensate water interface of the n-1st evaporator is connected to the condenser through a pipeline to complete condensation. The salt material produced by the 1st evaporator and the n-1st evaporator in the parallel flow type is separated and treated in a thickener. The separated solid is a salt product, and the separated liquid is used as a mother liquor and can be poured into the raw material tank 1 for further treatment. The preheating tank 4, the raw material tank 1, the separator, the condenser, the thickener and the pump group and valve group on each pipeline are all prior art, and will not be described here.

[0042] In order to improve the utilization rate of medium pressure steam in the process, the application maintains the mode of pouring the condensate water in the 1st evaporator into the preheating tank 4 for preheating, and adopts a split processing mode for the medium pressure steam. Specifically, the medium pressure output side 5 is provided with a dry flow pipe 51 and a main branch pipe 52. The dry flow pipe 51 is connected with the heating steam inlet of the 1st evaporator. The main branch pipe 52 is provided with a plurality of branch pipes 53. The branch pipes 53 correspond to the secondary steam pipes 6 of the parallel flow type multi-effect evaporation system 3 one by one. The branch pipes 53 and the output ends of the secondary steam pipes 6 are both arranged on a steam mixer 7. The steam mixer 7 is internally provided with a rotating column tube type inner core 78 for uniformly mixing the medium pressure steam and the secondary steam. The output end of the steam mixer 7 is provided with a mixed steam pipe 77, which is connected with the heating steam inlet of the n-1st evaporator of the parallel flow type multi-effect evaporation system 3.

[0043] In the application, part of the medium pressure steam is introduced into the steam mixer 7 in a branched manner. The flow rate of the medium pressure steam entering the branch pipe 53 from the main branch pipe 52 is controlled by a valve. The required temperature of different evaporators controls the flow rate of the medium pressure steam. Part of the medium pressure steam and the secondary steam are uniformly mixed in the steam mixer 7, which is conducive to obtaining a relatively controllable temperature and compensating for the temperature of the secondary steam separated by the separator. The halide water in the evaporator of the next effect of the parallel flow type multi-effect evaporation system 3 is heated by the mixed steam, which is conducive to ensuring the concentration efficiency of the halide water in the evaporator. The application utilizes the medium pressure steam to drive the temperature control and efficiency of the salt production process, which improves the utilization rate of the medium pressure steam and is conducive to ensuring the salt production quality.

[0044] In order to improve the mixing performance of the mixer 7 on the medium-pressure steam and the secondary steam, the mixer 7 has good mixing performance. Specifically, the mixer 7 comprises a body 71, the top of the body 71 is provided with a medium-pressure steam interface 72, the lower side of the medium-pressure steam interface 72 is provided with a medium-pressure steam buffer cavity 73, the bottom of the body 71 is provided with a secondary steam interface 74, the inner side of the secondary steam interface 74 is provided with a secondary steam buffer cavity 75, and the inner side of the body 71 is provided with a steam outlet buffer cavity 76 which is nested with a rotating columnar inner core 78. By buffering the medium-pressure steam and the secondary steam in the medium-pressure steam buffer cavity 73 and the secondary steam buffer cavity 75 respectively, and then entering the rotating columnar inner core 78, the uniform distribution performance of the medium-pressure steam and the secondary steam is improved, the mixed steam is buffered in the steam outlet buffer cavity 76 and then flows into the mixed steam pipe 77, which is beneficial to obtain uniform mixed steam and ensure the stability and safety of the mixed steam entering the next effect evaporator.

[0045] Further, the rotating columnar inner core 78 comprises a rotating cover 781, the medium-pressure steam buffer cavity 73 is arranged in a tapered manner in the interior of the rotating cover 781, the interior and the bottom of the rotating cover 781 are respectively provided with a hole plate 782 and a shell side body 783, the bottom of the hole plate 782 is provided with a plurality of columnar pipes 784 which are one-to-one corresponding to the hole positions on the hole plate 782 and located in the interior of the shell side body 783, the bottom end of the columnar pipe 784 is a plug end, the columnar pipe 784 is a flat cylindrical shape and comprises two end arc surfaces 7841 and two side arc surfaces 7842, the length of the side arc surface 7842 is greater than the length of the end arc surface 7841, and the two side arc surfaces 7842 are distributed in a hyperbolic manner, the side arc surfaces 7842 of different rows of columnar pipes 784 are distributed in a staggered manner, the columnar pipes 784 form a folded mixing gap therebetween, the shell side body 783 is provided with a steam outlet pipe 786 which communicates with the mixing gap, and the side arc surface 7842 is provided with a plurality of steam distribution holes 7843 which are distributed along the length direction thereof. Specifically, the medium-pressure steam enters different columnar pipes 784 from a plurality of hole positions in the medium-pressure steam buffer cavity 73 and has a certain movement stroke in the columnar pipe 784; on the one hand, the secondary steam and the medium-pressure steam exchange heat to a certain extent on the surface of the columnar pipe 784, and on the other hand, the medium-pressure steam is uniformly distributed into the mixing gap from different steam distribution holes 7843, the mixing gap not only compresses the concentration of the secondary steam, but also increases the contact area of the secondary steam and the medium-pressure steam, and in addition, the rotating function of the rotating columnar inner core 78, thereby effectively improving the mixing quality of the secondary steam and the medium-pressure steam, and further ensuring the control effect on the mixed steam.

[0046] Further, the distribution span of the steam holes is less than the length of the tube 784 and is biased to the lower half of the shell side body 783, the steam outlet buffer cavity is biased to the upper half of the corresponding shell side body 783, the steam outlet pipe 786 is arranged at a position close to the top of the shell side body 783, and the mixed steam pipe 77 is arranged at a position close to the bottom of the shell side body 783. The distribution span of the steam holes 7843 is conducive to prolonging the moving distance of the intermediate-pressure steam in the tube 784, improving the heating effect of the intermediate-pressure steam on the tube 784, and preheating the secondary steam before mixing with the intermediate-pressure steam; the position design of the steam outlet pipe 786 is conducive to ensuring that the secondary steam has sufficient moving distance and uniform distribution in the mixing gap, and further improving the mixing performance of the secondary steam and the intermediate-pressure steam.

[0047] In order to improve the uniform distribution performance of the secondary steam, the secondary steam uniform distribution inner core 8 is arranged at the bottom of the rotating tube type inner core 78, the secondary steam uniform distribution inner core 8 is provided with a plurality of vertical through holes 81, the distribution density of the vertical through holes 81 is greater than the tube side distribution density of the rotating tube type inner core 78, and the bottom of the secondary steam uniform distribution inner core 8 is provided with a bracket 9. The bottom of the bracket 9 is supported by the secondary steam collecting bucket 74, the bracket 9 includes a ring section and a ten field, the ring section limits the edge of the secondary steam uniform distribution inner core 8, and the ten field supports the main body of the secondary steam uniform distribution inner core 8. The secondary steam enters the plurality of vertical through holes 81 after buffering in the secondary steam buffer cavity 75, the uniformity of the secondary steam entering the mixing gap is improved through the dense arrangement of the vertical through holes 81, and the mixing performance of the secondary steam and the intermediate-pressure steam is ensured.

[0048] From the driving aspect of the rotating tube type inner core 78, the driving device 10 is arranged at the transmission end of the rotating tube type inner core 78, the driving device 10 includes a worm gear 101 which is synchronously connected with the rotating tube type inner core 78, the transmission side of the worm gear 101 is provided with a worm shaft 102, the power input end of the worm shaft 102 is provided with a speed reducer motor 103, and the transmission box 104 for installing the worm shaft 102 and the speed reducer motor 103 is arranged on the steam mixer 7. The worm gear 101 is in synchronous motion with the rotating cover 781 through key connection, the worm shaft 102 obtains power from the speed reducer motor 103 to drive the worm gear 101 and the rotating cover 781 to rotate synchronously, thereby driving the rotating tube type inner core 78 to rotate synchronously. The worm gear 101 and the worm shaft 102 drive the rotating tube type inner core 78 to rotate in the form of speed reduction and torque increase, and ensure the stability of the rotating tube type inner core 78 through the reverse self-locking motion characteristics. Furthermore, the worm gear 101 and the worm shaft 102 have high space utilization, which ensures the overall performance of the steam mixer 7.

[0049] In order to facilitate assembly, the transmission box 104 comprises a fixed box body 1041, the side of the fixed box body 1041 is provided with a mounting port 1042, two front and rear abutting movable covers 1043 are arranged in the mounting port 1042, the movable cover 1043 is connected with the fixed box body 1041 through bolts, the inside of the movable cover 1043 is provided with a shaft hole 1044 of a light hole structure for installing the worm 102, and the reduction motor 103 is arranged at the end of one of the movable covers 1043. The fixed box body 1041 is integrated with the body 71, and provides a relatively open mounting port 1042 for the worm wheel 101 and the worm 102, the worm 102 is clamped in the front and rear directions and then assembled to the fixed box body 1041, and then connected through bolts, so that the assembly of the worm wheel 101 and the worm 102 is completed, and the space utilization rate of the steam mixer 7 is ensured.

[0050] In order to improve the transmission balance of the worm wheel 101 and the worm 102 on the rotary column pipe type inner core 78, the steam mixer 7 is provided with a plurality of positioning support assemblies 11 arranged in a circular array, the positioning support assembly 11 comprises a support plate 111, the bottom surface and the side surface of the support plate 111 are matched with the top surface of the worm wheel 101 and the side surface of the rotary column pipe type inner core 78 respectively, the bottom of the support plate 111 is provided with a transverse groove 112, the longitudinal section of the transverse groove 112 is C-shaped and the mouth portion faces downward, a cylindrical roller 113 is arranged in the transverse groove 112, the rolling surface of the cylindrical roller 113 contacts the top surface of the worm wheel 101, a floating spring 114 is arranged at the end of the cylindrical roller 113, and the floating spring 114 is nested with a positioning column 115 arranged on the inner wall of the steam mixer 7. The worm wheel 101 is synchronously and transmissionally connected with the rotary cover 781, the conical surface of the rotary cover 781 is matched with the conical hole surface of the inner hole of the worm wheel 101, so as to support the bottom of the worm wheel 101; the side surface and the bottom surface of the support plate 111 support and limit the side surface of the rotary cover 781 and the top of the worm wheel 101 respectively; the worm wheel 101 needs to rotate continuously in the working process, and the rolling support of the cylindrical roller 113 can improve the rotation balance of the worm wheel 101. The floating spring 114 can make the cylindrical roller 113 have a certain floating performance through the radial contact with the cylindrical roller 113, reduce the friction performance of the end surface of the worm wheel 101, and further improve the rotation balance of the worm wheel 101 and the rotary column pipe type inner core 78.

[0051] Further, the inner top of the body 71 is provided with a thrust bearing assembly 79 matched with the top of the rotating columnar inner core 78, and the inner side of the body 71 is provided with an upper bushing 710 and a lower bushing 711 distributed in an upper-lower direction, the upper bushing 710 and the lower bushing 711 are matched with the side of the rotating columnar inner core 78, and the side of the upper bushing 710 and the lower bushing 711 are smooth. The neck of the rotating cover 781 is supported by the thrust bearing assembly 79, and the rotating columnar inner core 78 is supported by the upper bushing 710 and the lower bushing 711 from the vertical span, so that the rotating columnar inner core 78 is better supported, and the mixing performance of the medium-pressure steam and the secondary steam in the mixer 7 is improved.

[0052] In order to improve the sealing performance of the mixer 7, the lower bushing 711 is nested in the inner wall of the body 71, the top of the upper bushing 710 is matched with the positioning groove 712 arranged in the body 71, and the bottom of the upper bushing 710 is matched with the thrust plate 713 arranged on the side of the rotating columnar inner core 78. In this way, the upper bushing 710 and the lower bushing 711 not only have the function of the bearing bush, but also have a certain sealing performance on the top and bottom of the steam buffer cavity 76, so as to ensure the quality of the mixed steam and the actual service life of the internal structure of the mixer 7.

[0053] The above is only a preferred embodiment of the present application, and is not intended to limit the other forms of the present application. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments still belongs to the protection scope of the present application.

Claims

1. A drying furnace pressure steam utilization device for salt production, comprising a raw material tank, a steam generating device and a concurrent multi-effect evaporation system, wherein the output side of the condensate water of the first effect of the concurrent multi-effect evaporation system is provided with a preheating tank, the feed side and the discharge side of the preheating tank are connected with the raw material tank and the first effect evaporator of the concurrent multi-effect evaporation system respectively, and the steam generating device comprises a medium pressure output side. The medium pressure output side is provided with a dry flow pipe and a main branch pipe, the dry flow pipe is connected with the heating steam inlet of the 1-effect evaporator, the main branch pipe is provided with a plurality of branch pipes, the flow from the main branch pipe to the branch pipe is controlled by a valve, the branch pipe corresponds to a plurality of secondary steam pipes of the downstream multi-effect evaporation system, the output end of the branch pipe and the secondary steam pipe is arranged on a steam mixer, the steam mixer is internally provided with a rotating column pipe type inner core, the rotating column pipe type inner core is used to uniformly mix the medium pressure steam and the secondary steam, the output end of the steam mixer is provided with a mixed steam pipe, and the mixed steam pipe is connected with the heating steam inlet of the n-1-effect evaporator of the downstream multi-effect evaporation system.

2. The device for utilizing pressure steam in a drying furnace for salt production according to claim 1, characterized in that, The steam mixer comprises a body, a medium pressure steam interface is arranged at the top of the body, a medium pressure steam buffer cavity is arranged below the medium pressure steam interface, a secondary steam receiving tank is arranged at the bottom of the body, a secondary steam buffer cavity is arranged at the inner side of the secondary steam receiving tank, and an outlet steam buffer cavity is arranged at the inner side of the body and nested with the rotating column pipe type inner core.

3. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 2, characterized in that, The rotating column pipe type inner core comprises a rotating cover, the medium pressure steam buffer cavity is arranged in a tapered manner in the interior of the rotating cover, a hole plate and a shell side body are arranged at the interior and bottom of the rotating cover respectively, a plurality of column pipes corresponding to the hole positions on the hole plate and located in the interior of the shell side body are arranged at the bottom of the hole plate, the bottom end of the column pipe is a plug end, the column pipe is a flat cylindrical shape and comprises two end arc surfaces and two side arc surfaces, the length of the side arc surface is greater than the length of the end arc surface, the two side arc surfaces are distributed in a hyperbolic manner, the side arc surfaces of different rows of column pipes are distributed in a staggered manner, folding type mixing gaps are formed between the column pipes, an outlet steam pipe is arranged on the shell side body and communicates with the mixing gaps, and a plurality of steam distribution holes are arranged on the side arc surface and distributed along the length direction of the side arc surface.

4. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 3, characterized in that, The distribution span of the steam distribution hole is smaller than the length of the column pipe and is distributed in the lower half of the shell side body, the outlet steam buffer cavity is distributed in the upper half of the corresponding shell side body, the outlet steam pipe is arranged at a position close to the top of the shell side body, and the mixed steam pipe is arranged at a position close to the bottom of the shell side body.

5. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 1 or 4, characterized in that, The bottom of the rotating column pipe type inner core is provided with a secondary steam uniform distribution inner core, the secondary steam uniform distribution inner core is provided with a plurality of vertical through holes, the distribution density of the vertical through holes is greater than the tube side distribution density of the rotating column pipe type inner core, and the bottom of the secondary steam uniform distribution inner core is provided with a bracket.

6. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 1, characterized in that, The driving end of the rotating column pipe type inner core is provided with a driving device, the driving device comprises a worm gear connected with the rotating column pipe type inner core in a synchronous manner, the driving side of the worm gear is provided with a worm, the power input end of the worm is provided with a speed reduction motor, and the steam mixer is provided with a transmission box for installing the worm and the speed reduction motor.

7. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 6, characterized in that, The transmission box comprises a fixed box body, the side surface of the fixed box body is provided with a mounting port, two front and rear abutting movable covers are arranged in the mounting port, the movable covers are connected with the fixed box body through bolts, the interior of the movable covers is provided with a shaft hole for installing the worm, and the speed reduction motor is arranged at the end of one of the movable covers.

8. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 6, characterized in that, The inside of the vapor mixer is provided with a plurality of positioning support assemblies arranged in a circular array, the positioning support assemblies comprise support plates, the bottom surface and side surface of the support plates are matched with the top surface of the worm gear and the side surface of the rotating column tube type inner core respectively, the bottom of the support plate is provided with a transverse groove, a cylindrical roller is arranged in the transverse groove, the rolling surface of the cylindrical roller is in contact with the top surface of the worm gear, the end of the cylindrical roller is provided with a floating spring, and the floating spring is nested with a positioning column arranged on the inner wall of the vapor mixer.

9. The device for utilizing the pressure steam in a drying furnace for salt production according to claim 2, characterized in that, The inner top of the body is provided with a thrust bearing assembly matched with the top of the rotating column tube type inner core, the inner side surface of the body is provided with an upper bushing and a lower bushing distributed in an upper and lower interval, the upper bushing and the lower bushing are rotationally matched with the side surface of the rotating column tube type inner core, and the side surface of the upper bushing and the lower bushing are both smooth surfaces.

10. The device for utilizing pressure steam in a drying furnace for salt production according to claim 9, characterized in that, The lower bushing is nested in the inner wall of the body, the top of the upper bushing is matched with a positioning groove arranged in the body, and the bottom of the upper bushing is matched with a thrust plate arranged on the side surface of the rotating column tube type inner core.

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