Alkali evaporation apparatus with steam reuse

Abstract

The application relates to the technical field of evaporation equipment, and particularly discloses a lye evaporation device with steam recycling, which has an evaporation cavity and a liquid outlet cavity in a shell, a heat exchange pipe bundle is arranged in the shell and sequentially passes through the evaporation cavity and the liquid outlet cavity, a driving rod is vertically arranged and can rotate, a spiral track and a plurality of annular tracks distributed upwards and downwards are arranged on the driving rod, an elastic twistable track changer is arranged at the joint of the annular track and the spiral track, a top frame and a bottom frame are both sleeved on the driving rod and are provided with matching parts, the matching parts can be slidingly matched in the annular track or the spiral track, a flexible filter part is connected with the top frame and the bottom frame, and a plurality of outward annular creases are reserved on the flexible filter part. The lye evaporation device with steam recycling can realize relatively comprehensive cleaning of the inner wall of the heat exchange pipe through folding and upward movement of the flexible filter part, the cleaning strength is relatively large, and the cleaning effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of evaporation equipment, in particular to an alkali evaporation device with steam recycling. BACKGROUND

[0002] Liquid alkali evaporation refers to the process of concentrating alkali solution by evaporating water under certain conditions. Liquid alkali evaporation usually requires the use of an evaporator. The type of evaporator can be selected according to the properties of the liquid alkali and the evaporation requirements, such as natural evaporator, mechanical evaporator, vacuum evaporator, etc. During the evaporation process, some precipitates and impurities may accumulate in the evaporator, affecting the evaporation effect. Therefore, the evaporator needs to be cleaned regularly to ensure its normal operation.

[0003] The Chinese patent document with the authorization announcement number CN113941164B discloses a caustic soda evaporation device, which includes an evaporation cylinder and a sinking cylinder arranged side by side. A plurality of heat exchange pipes are fixedly arranged in the evaporation cylinder. The top of the sinking cylinder is provided with an air passage. The air passage is uniformly provided with exhaust holes. The exhaust holes are inclined from top to bottom. The exhaust holes control the discharge angle of the airflow. The side adjacent to the exhaust holes is provided with a cleaning strip. Under the guidance of the exhaust holes, the airflow will change to an inclined posture, thereby blowing the cleaning strip upward to clean the inner wall of the heat exchange pipe and achieve the best cleaning effect. The cleaning strip is made of chemical fiber material. When it is blown by the airflow, it can float and continuously vibrate. The body of the cleaning strip contacts and irregularly rubs the inner wall of the heat exchange pipe, thereby cleaning the impurities adhered to the inner wall of the heat exchange pipe.

[0004] However, the cleaning is achieved by irregular friction, which is disordered and irregular. Some areas on the inner wall of the heat exchange pipe may not be effectively cleaned by the cleaning strip. The cleaning strip is attached to the cleaning by relying on the flow of the airflow. The posture of the cleaning strip is unstable, making it difficult to form a large cleaning force on the inner wall of the heat exchange pipe, and the cleaning effect is weakened. SUMMARY

[0005] The present application provides an alkali evaporation device with steam recycling, which aims to solve the problems of ineffective cleaning of some areas on the inner wall of the heat exchange pipe and weakened cleaning effect in related technologies.

[0006] The steam recycling alkali evaporation device of the present application comprises a shell, a heat exchange tube bundle and a filtrate assembly, the shell has an evaporation cavity and a liquid outlet cavity spaced apart from each other, the heat exchange tube bundle is arranged in the shell and sequentially passes through the evaporation cavity and the liquid outlet cavity from top to bottom, the filtrate assembly is arranged in the heat exchange tube of the heat exchange tube bundle, the filtrate assembly comprises a driving rod, a top frame, a bottom frame and a flexible filter piece, the driving rod is vertically arranged and rotatable, the driving rod is provided with a spiral track and a plurality of annular tracks distributed upward and downward, the junction of the annular track and the spiral track is provided with a lane changer capable of being elastically twisted; the top frame and the bottom frame are sleeved on the driving rod and are provided with matching parts, initially, the matching part of the top frame is slidingly fitted in the annular track, the matching part of the bottom frame is slidingly fitted in the spiral track, when the driving rod rotates, the lane changer can guide the matching part of the top frame into the spiral track; the flexible filter piece is in a cylindrical shape and is connected to the top frame and the bottom frame, a plurality of outward annular folds vertically spaced apart are reserved on the flexible filter piece, when the bottom frame moves upward relative to the top frame, the flexible filter piece is folded layer by layer, and the annular fold part of the flexible filter piece is in contact with the inner wall of the heat exchange tube.

[0007] The first matching part and the second matching part realize the alternating upward movement of the top frame and the bottom frame, so that the flexible filter piece can be reciprocatingly folded and unfolded, when folded, the annular fold part of the flexible filter piece can scrape the inner wall of the heat exchange tube to scrape off impurities. When scraping the inner wall of the heat exchange tube, the posture of the annular fold is stable, and as the bottom frame moves upward, the folding degree deepens, and the extrusion force on the inner wall of the heat exchange tube gradually increases, thereby increasing the cleaning strength on the inner wall of the heat exchange tube and improving the cleaning effect. The annular fold cleans the inner wall of the heat exchange tube from bottom to top, and the cleaning method is more orderly and comprehensive, most or even all areas on the inner wall of the heat exchange tube can be cleaned by the annular fold, thereby improving the cleaning coverage.

[0008] Preferably, the bottom frame comprises a supporting frame body and a movable frame body, the movable frame body is elastically and vertically slidingly connected with the supporting frame body, and the bottom end of the flexible filter piece is connected with the movable frame body; a pushing piece is rotatably arranged on the supporting frame body, one end of the pushing piece abuts against the movable frame body, and the other end of the pushing piece extends to the inner side of the supporting frame body; a stop piece is arranged on the top frame, when the bottom frame moves upward relative to the top frame, the stop piece can block the pushing piece and force the pushing piece to deflect, and the pushing piece pushes the movable frame body upward; a locking piece is arranged on the supporting frame body, the locking piece is used to lock the movable frame body after the movable frame body moves upward, and an unlocking piece is arranged on the top frame, the unlocking piece is used to unlock the locking piece when the top frame moves upward relative to the bottom frame.

[0009] Preferably, the locking piece comprises a locking block and a check piece, the locking block is connected with the movable frame body through a supporting rod, and the locking block is provided with an inclined or circular arc transition surface; the check piece is elastically connected with the supporting frame body in the horizontal direction, and the middle part of the check piece is provided with an opening for the supporting rod to pass through; initially, the locking block is located below the check piece, and the check piece is pressed against the supporting rod; when the movable frame body moves upward, the locking block can extrude over the check piece through the transition surface, and under the action of elastic force, the check piece is locked below the locking block; a wedge structure is arranged between the check piece and the unlocking piece, and the unlocking piece is used to extrude the check piece back when the unlocking piece moves upward.

[0010] Preferably, the wedge structure comprises a wedge surface arranged on the check piece and / or the locking piece.

[0011] Its effect lies in that after the locking state of the check piece to the locking block is released, under the action of elastic force, the movable frame body and the locking block will quickly move downward, so as to quickly deploy the flexible filter element and generate a downward pulling action, which can cause the vibration of the flexible filter element, so that the impurities adhered to the flexible filter element are shaken off downward, the self-cleaning effect of the flexible filter element is improved, and the repeated use of the flexible filter element is ensured.

[0012] Preferably, a circumferential dirt collecting groove is formed on the supporting frame body, and the dirt collecting groove is used to collect the impurities falling off the flexible filter element.

[0013] Its effect lies in that the dirt collecting groove temporarily collects the impurities, so as to avoid the scattering of the impurities.

[0014] Preferably, the bottom end of the spiral track is located below the heat exchange pipe, so that the supporting frame body and the dirt collecting groove move out of the heat exchange pipe, and the shell is provided with a cleaning liquid inlet communicating with the liquid outlet cavity.

[0015] Its effect lies in that when the dirt collecting groove is exposed to the liquid outlet cavity, external cleaning liquid or pure water can be poured into the liquid outlet cavity through the cleaning liquid inlet, then the pouring is stopped, and the water flows out of the liquid outlet cavity, so as to carry out the impurities collected by the dirt collecting groove, and the cleaning of the dirt collecting groove is realized.

[0016] Preferably, the shell is provided with a power device for controlling the rotation of the driving rod.

[0017] Preferably, the shell is provided with a high-temperature gas inlet and a high-temperature gas outlet communicating with the evaporation cavity.

[0018] Preferably, the shell further has a liquid distribution cavity above the evaporation cavity, the top end of the heat exchange pipe communicates with the liquid distribution cavity, and the liquid distribution cavity is provided with a water distributor.

[0019] Its effect is that the water distributor is used to distribute the alkaline solution evenly, so that a water film is formed on the inner wall of the heat exchange tube.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0021] The top and bottom frames move alternately upwards via a first and a second mating component, allowing the flexible filter element to be repeatedly folded and unfolded. During folding, the annular creases of the flexible filter element scrape the inner wall of the heat exchange tube, achieving cleaning. As the bottom frame moves upwards, the annular creases deepen, increasing the pressure on the inner wall of the heat exchange tube. The stable posture of the annular creases further enhances the cleaning force and improves the cleaning effect. The annular creases clean the inner wall of the heat exchange tube from bottom to top, resulting in a more orderly and comprehensive cleaning method. Most or even all areas of the inner wall of the heat exchange tube can be cleaned by the annular creases, increasing the cleaning coverage. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the alkaline evaporation device for steam reuse according to the present invention.

[0023] Figure 2 This is a cross-sectional schematic diagram of the alkaline evaporation apparatus for steam reuse according to the present invention.

[0024] Figure 3 This is the invention Figure 2 Enlarged diagram of point A in the middle.

[0025] Figure 4 This is a structural schematic diagram of the drive rod portion of the present invention.

[0026] Figure 5 This is a structural schematic diagram of the top frame to bottom frame portion of the present invention.

[0027] Figure 6 This is the invention Figure 5 Enlarged diagram of point B in the middle.

[0028] Figure 7 This is a three-dimensional schematic diagram of the check valve of the present invention.

[0029] Figure label:

[0030] 100. Shell; 101. Liquid distribution chamber; 101a. Raw material inlet; 101b. Water distributor; 102. Evaporation chamber; 102a. High-temperature gas inlet; 102b. High-temperature gas outlet; 103. Liquid outlet chamber; 103a. Concentrate outlet; 103b. Cleaning liquid inlet; 103c. Cleaning liquid outlet; 104. Mounting chamber; 104a. Gear set;

[0031] 200, heat exchange tube bundle; 201, heat exchange tube;

[0032] 1, driving rod; 11, spiral track; 12, annular track; 13, track changing piece; 2, top frame; 21, disc structure; 211, first matching part; 22, cylindrical structure; 221, stop part; 222, unlocking part; 3, bottom frame; 31, support frame body; 311, inner ring frame; 311a, second matching part; 312, connecting rod; 313, outer ring frame; 313a, dirt collecting groove; 314, sleeve frame; 314a, pushing part; 32, movable frame body; 321, tension spring; 322, stop rod; 4, flexible filter part; 41, annular crease; 5, locking part; 51, locking block; 511, support rod; 512, transition surface; 52, non-return part; 521, push spring; 522, wedge surface. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by way of examples are intended to explain the present application, and should not be construed as limiting the present application.

[0034] The present application is described below in conjunction with Figures 1 to 7 a steam-reusing alkali evaporation device.

[0035] As shown in Figure 1 and Figure 2 , the steam-reusing alkali evaporation device of the present application comprises a housing 100, a heat exchange tube bundle 200 and a filtrate assembly.

[0036] The housing 100 has a liquid distribution chamber 101, an evaporation chamber 102 and a liquid outlet chamber 103 arranged in sequence from top to bottom. The top end of the housing 100 is provided with a raw liquid inlet 101a communicating with the liquid distribution chamber 101, for introducing the alkali liquid to be treated, and a water distributor 101b fixedly arranged in the liquid distribution chamber 101 for uniformly distributing the alkali liquid. The housing 100 is provided with a high-temperature gas inlet 102a and a high-temperature gas outlet 102b communicating with the evaporation chamber 102, and the high-temperature gas flows into the evaporation chamber 102 from the high-temperature gas inlet 102a and flows out of the evaporation chamber 102 from the high-temperature gas outlet 102b, thereby forming a high-temperature environment in the evaporation chamber 102 during the flow, facilitating the subsequent evaporation operation. The high-temperature gas can be waste flue gas, steam or the like. If steam is used, condensed water will be generated in the evaporation chamber 102 after evaporation, and the high-temperature gas outlet 102b can also be used to discharge the condensed water. The housing 100 is provided with a concentrated liquid outlet 103a communicating with the bottom of the liquid outlet chamber 103, and a first valve (not shown in the figure) for controlling the opening and closing of the concentrated liquid outlet 103a can be installed at the concentrated liquid outlet 103a.

[0037] The heat exchange tube bundle 200 extends vertically and is fixed in the shell 100, a part of the tube segments is located in the evaporation cavity 102, and another part of the tube segments is located in the liquid outlet cavity 103. The top end of the heat exchange tube 201 in the heat exchange tube bundle 200 is in communication with the liquid distribution cavity 101. The lye passing through the liquid distributor 101b forms a water film on the inner wall of the heat exchange tube 201. When the water film flows downward, heat exchange occurs with the high-temperature gas in the evaporation cavity 102, thereby achieving the purpose of evaporation and realizing the concentration of the lye. Then, the concentrated liquid is discharged into the liquid outlet cavity 103 and then discharged outward through the concentrated liquid outlet 103a.

[0038] With reference to the foregoing Figures 2 to 5 , a plurality of filtrate assemblies are arranged in the plurality of heat exchange tubes 201. The filtrate assembly comprises a driving rod 1, a top frame 2, a bottom frame 3 and a flexible filter 4.

[0039] The shell 100 has a mounting cavity 104 below the liquid outlet cavity 103. The mounting cavity 104 and the liquid outlet cavity 103 are separated by a partition plate fixed on the shell 100. The driving rod 1 is coaxially arranged in the heat exchange tube 201. The bottom of the driving rod 1 penetrates through the partition plate and is rotationally connected with the partition plate, and then extends into the mounting cavity 104. The mounting cavity 104 is provided with a power device. The power device can be a plurality of motors connected with the plurality of driving rods 1 respectively, each motor controls the rotation of one driving rod 1; or a single motor connected with each driving rod 1 through a gear set 104a to control the synchronous rotation of each driving rod 1. The driving rod 1 is provided with a spiral track 11 arranged around the axis of the driving rod 1 and a plurality of annular tracks 12 vertically and equally spaced. A track changer is arranged at the intersection of the spiral track 11 and the annular track 12. The track changer can be a track changing piece 13 arranged on one side of the spiral track 11 and inclined. The bottom end of the track changing piece 13 is hingedly connected with the bottom surface of the annular groove, and a torsion spring is further connected therebetween. Alternatively, the track changing piece 13 is made of elastic material and is fixedly connected with the bottom surface of the annular groove at the bottom end. The track changing piece 13 can be twisted and deformed around the bottom end as a fulcrum. The elastic material can be rubber, plastic or metal spring sheet, etc.

[0040] The top frame 2 is composed of a disc-shaped structure 21 located above and a cylindrical structure 22 located below and provided with a liquid passage. The disc-shaped structure 21 is sleeved on the driving rod 1 and is provided with a matching part, which is a first matching part 211. Initially, the first matching part 211 is slidingly fitted in the annular track 12. When the driving rod 1 rotates Figure 4When the driving rod 1 rotates in the direction indicated by the arrow N (the direction of rotation of the driving rod 1), the annular track 12 rotates, and at this time, the first matching member 211 can be regarded as sliding in the annular track 12, and the first matching member 211 gradually approaches the lane-changing sheet 13, until the lane-changing sheet 13 is pressed and twisted, and then the top end of the lane-changing sheet 13 is placed on a side wall of the spiral track 11 and leaves the channel to the spiral track 11, and the first matching member 211 can enter the spiral track 11 above along the lane-changing sheet 13, thereby realizing the effect of changing lanes from the annular track 12 to the spiral track 11.

[0041] The base frame 3 is located below the top frame 2, and includes a support frame body 31 and a movable frame body 32. The support frame body includes an inner ring frame 311, a connecting rod 312 and an outer ring frame 313, the inner ring frame 311 is sleeved on the driving rod 1 and is provided with a matching member, which is a second matching member 311a, which is initially slidingly fitted in the spiral track 11. When the driving rod 1 rotates, the spiral track 11 rotates, and at this time, the second matching member 311a can be regarded as sliding and rising in the spiral track 11. The outer ring frame 313 is sleeved on the outer circumferential side of the inner ring frame 311 and is connected with the inner ring frame 311 through the connecting rod 312, the outer ring frame 313 is in contact with the inner wall of the heat exchange pipe 201, and the outer ring frame 313 is formed with a circumferential pollution collecting groove 313a. The support frame body 31 further includes a sleeve frame 314 fixedly arranged on the top surface of the outer ring frame 313, the sleeve frame 314 is sleeved on the outside of the cylindrical structure 22 and has a clearance gap therebetween, the movable frame body 32 is annular and is slidingly sleeved on the sleeve frame 314, and the movable frame body 32 is connected with the sleeve frame 314 through a tension spring 321.

[0042] The flexible filter 4 is in a cylindrical shape and is connected with the disc-shaped structure 21 and the movable frame body 32 at the top and bottom ends respectively, and can be a filter screen, filter cloth or the like. The flexible filter 4 is provided with a plurality of outward annular creases 41 arranged at equal intervals in the vertical direction. Initially, the flexible filter 4 is in an unfolded state, and the concentrated liquid after evaporation flows into the annular gap between the flexible filter 4 and the inner wall of the heat exchange pipe 201, then enters the inside through the flexible filter 4, and then flows into the inside of the cylindrical structure 22 through the liquid passage hole, and finally flows into the liquid outlet chamber 103. When passing through the flexible filter 4, the flexible filter 4 filters the impurities in the concentrated liquid, thereby increasing the purity of the concentrated liquid.

[0043] After being used for a period of time, the inner wall of the heat exchange tube 201 will accumulate a certain amount of dirt adhered thereto, affecting the heat exchange efficiency, and then affecting the evaporation preparation of the lye. At this time, the driving rod 1 can be controlled to rotate. Since the first matching part 211 slides in the annular track 12 and the second matching part 311a slides in the spiral track 11, the height of the top frame 2 does not change at this time, and the bottom frame 3 moves upward. When the bottom frame 3 moves upward, the distance between the bottom frame 3 and the top frame 2 gradually shortens, and the flexible filter part 4 starts to fold layer by layer, and the annular creases 41 partially fold outward and come into contact with the inner wall of the heat exchange tube 201. Then, the annular creases 41 scrape the dirt on the inner wall of the heat exchange tube 201 as the bottom frame 3 moves upward, and the dirt enters between adjacent two annular creases 41 and is temporarily retained there. When the bottom frame 3 moves upward by a larger amount, the flexible filter part 4 is folded more deeply, the annular creases 41 have a greater extrusion force with the inner wall of the heat exchange tube 201, and the posture of the annular creases 41 is stable, so that the cleaning force on the inner wall of the heat exchange tube 201 is increased, and the cleaning effect is improved.

[0044] When the first matching part 211 starts to enter the spiral track 11 from the lane-changing sheet 13, the second matching part 311a just starts to enter the annular track 12. Then, the first matching part 211 slides in the spiral track 11, the top frame 2 moves upward, and the second matching part 311a slides in the annular track 12, the height of the bottom frame 3 does not change. When the top frame 2 moves upward, the flexible filter part 4 is unfolded again, and the impurities clamped between adjacent two annular creases 41 fall into the dirt collecting groove 313a, and the dirt collecting groove 313a collects the impurities. In this way, when the driving rod 1 rotates, due to the lane-changing effect of the lane-changing sheet 13, the first matching part 211 and the second matching part 311a change lanes alternately, and the bottom frame 3 and the top frame 2 move upward alternately, so that the inner wall of the heat exchange tube 201 can be cleaned from bottom to top. This cleaning method is more orderly and comprehensive, and most or even all areas of the inner wall of the heat exchange tube 201 can be cleaned by the annular creases 41, thereby improving the cleaning coverage.

[0045] Key reference Figure 5 In order to ensure that the annular creases 41 fold outward smoothly, a plurality of blocking rods 322 are fixed on the movable frame body 32 and are circumferentially distributed on the inner side of the flexible filter part 4. The blocking rods 322 are used to block the annular creases 41, so as to prevent the annular creases 41 from folding inward when the flexible filter part 4 is folded, that is, to ensure the outward folding of the annular creases 41.

[0046] Continue to refer to Figures 5 to 7The inclined pushing piece 314a is rotatably arranged on the sleeve frame 314, the upper end of the pushing piece 314a is located outside the sleeve frame 314 and abuts against the bottom surface of the movable frame body 32, the lower end of the pushing piece 314a extends to the inside of the sleeve frame 314, and the stopper 221 is fixed on the cylindrical structure 22. When the top frame 2 moves upward relative to the bottom frame 3, the stopper 221 can block the pushing piece 314a and force the pushing piece 314a to deflect, the upper end of the pushing piece 314a pushes the movable frame body 32 upward, so that the movable frame body 32 moves upward relative to the sleeve frame 314, and the tension spring 321 is stretched and stores energy.

[0047] The supporting frame body 31 is provided with a locking piece 5, which includes a locking block 51 and a check piece 52. The locking block 51 is fixedly connected to the bottom surface of the movable frame body 32 through a vertical supporting rod 511, and the locking block 51 is provided with an inclined or arc-shaped transition surface 512. The check piece 52 is slidably arranged on the sleeve frame 314 in the horizontal direction, and a push spring 521 is connected between the check piece 52 and the sleeve frame 314. The middle part of the check piece 52 is provided with a gap for the supporting rod 511 to pass through. Initially, the locking block 51 is located below the check piece 52, and the check piece 52 is pressed against the supporting rod 511. When the movable frame body 32 moves upward, the locking block 51 presses the check piece 52 through the transition surface 512, the check piece 52 retreats and avoids the locking block 51. When the locking block 51 passes the check piece 52, the check piece 52 is pressed against the supporting rod 511 again under the elastic force of the push spring 521. At this time, the check piece 52 is locked below the locking block 51, avoiding the movement of the locking block 51, and further avoiding the movement of the movable frame body 32.

[0048] The unlocking piece 222 is fixed on the cylindrical structure 22, and a wedge structure is arranged between the unlocking piece 222 and the check piece 52. The wedge structure includes a wedge surface 522 arranged on the free end of the check piece 52. Under the action of the push spring 521, the free end of the check piece 52 extends into the inside of the sleeve frame 314.

[0049] When the top frame 2 moves upward relative to the bottom frame 3, the flexible filter piece 4 gradually unfolds, and the unlocking piece 222 moves upward with the top frame 2. When the flexible filter piece 4 is about to be completely unfolded, the unlocking piece 222 contacts the wedge surface 522 and makes the check piece 52 retreat by pressing the wedge surface 522. The locking state of the check piece 52 to the locking block 51 is released. Under the action of the tension spring 321, the movable frame body 32 and the locking block 51 quickly move downward. At this time, the movable frame body 32 moves downward relative to the top frame 2, thereby quickly unfolding the flexible filter piece 4 and generating a downward pulling action. This can cause the vibration of the flexible filter piece 4, so that the impurities adhering to the flexible filter piece 4 are shaken off downward, improving the self-cleaning effect of the flexible filter piece 4 and ensuring the repeated use of the flexible filter piece 4.

[0050] Continuing to refer to Figures 1 to 3The bottom end of the spiral track 11 is below the heat exchange pipe 201, and the shell 100 is provided with a cleaning liquid inlet 103b which communicates with the liquid outlet cavity 103. The second valve which controls the opening and closing of the cleaning liquid inlet 103b can be installed at the cleaning liquid inlet 103b.

[0051] When the flexible filter 4 cleans the inner wall of the heat exchange pipe 201 from bottom to top, the driving rod 1 can be reversed. When the first matching part 211 and the second matching part 311a slide, they will pass through the lane changing piece 13 and be blocked by the lane changing piece 13. Therefore, they can only slide into the spiral track 11 below, that is, the first matching part 211 and the second matching part 311a will move spirally downward along the track of the spiral track 11 until the support frame 31 is taken out of the heat exchange pipe 201. At this time, the dirt collecting groove 313a is exposed in the liquid outlet cavity 103. The cleaning liquid inlet 103b can be opened through the second valve, the external cleaning liquid or pure water is poured into the liquid outlet cavity 103, and then the pouring of water is stopped. The water flows out of the liquid outlet cavity 103, carries out the impurities collected in the dirt collecting groove 313a, and realizes the cleaning of the dirt collecting groove 313a. In other embodiments, a cleaning liquid outlet 103c which communicates with the liquid outlet cavity 103 can be opened on the shell 100. The cleaning liquid outlet 103c and the cleaning liquid inlet 103b are opposite to each other. In this way, the pure water enters from the cleaning liquid inlet 103b and is discharged from the cleaning liquid outlet 103c, forming a flow path. In the flow, the impurities in the dirt collecting groove 313a are carried out.

[0052] In the embodiment, the shapes of the first matching part 211 and the second matching part 311a can be block-shaped, spherical, etc. The shape of the pushing part 314a can be rod-shaped, strip-shaped, etc. The shapes of the stop part 221 and the unlocking part 222 can be block-shaped, convex-shaped, etc. The shape of the check part 52 can be strip-shaped, rod-shaped, etc.

[0053] In other embodiments, the locking block 51 and the supporting rod 511 in the locking part 5 can be replaced by a ratchet, and the check part 52 can be replaced by a pawl. After moving upward, the pawl realizes the check function on the ratchet. The wedge surface 522 in the wedge structure can be arranged on the unlocking part 222, or the wedge surface 522 can be two, arranged on the check part 52 and the unlocking part 222.

[0054] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0055] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0056] Although the embodiments of the application have been shown and described above, it should be understood that the above-described embodiments are exemplary and cannot be understood as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the application.

Claims

1. An alkali evaporation device with steam recycling, comprising a shell, an evaporation cavity and a liquid outlet cavity spaced apart from each other in the shell, and a heat exchange tube bundle arranged in the shell and sequentially passing through the evaporation cavity and the liquid outlet cavity from top to bottom, characterized in that, The filter assembly is arranged in the heat exchange tube of the heat exchange tube bundle, and comprises a driving rod, a top frame, a bottom frame and a flexible filter piece. The driving rod is vertically arranged and rotatable, and is provided with a spiral track and a plurality of annular tracks distributed upward and downward. The annular track and the spiral track are provided with an elastic twistable track changer at the junction. The top frame and the bottom frame are sleeved on the driving rod and are provided with matching parts. Initially, the matching part of the top frame is slidingly fitted in the annular track, and the matching part of the bottom frame is slidingly fitted in the spiral track. When the driving rod rotates, the track changer can guide the matching part of the top frame into the spiral track. The flexible filter piece is in a cylindrical shape and is connected to the top frame and the bottom frame. The flexible filter piece is provided with a plurality of outwardly extending annular folds arranged vertically and spaced apart. When the bottom frame moves upward relative to the top frame, the flexible filter piece is folded layer by layer, and the annular fold part is in contact with the inner wall of the heat exchange tube. The bottom frame comprises a supporting frame body and a movable frame body. The movable frame body is elastically connected to the supporting frame body in the vertical direction. The supporting frame body comprises an inner ring frame, a connecting rod, an outer ring frame and a sleeve frame. The movable frame body is annular and is slidingly sleeved on the sleeve frame. A tension spring is connected between the movable frame body and the sleeve frame. The bottom end of the flexible filter piece is connected to the movable frame body. A pushing piece is rotatably arranged on the supporting frame body and abuts against the movable frame body. A stop piece is arranged on the top frame. When the bottom frame moves upward relative to the top frame, the stop piece can block the pushing piece and force the pushing piece to deflect, and the pushing piece pushes the movable frame body upward. A locking piece is arranged on the supporting frame body and is used to lock the movable frame body after the movable frame body moves upward. An unlocking piece is arranged on the top frame and is used to unlock the locking piece when the top frame moves upward relative to the bottom frame. The locking piece comprises a locking block and a check piece. The locking block is connected to the movable frame body by a supporting rod. The locking block is provided with an inclined or arc-shaped transition surface. The check piece is elastically connected to the supporting frame body in the horizontal direction. The middle part of the check piece is provided with an opening for the supporting rod to pass through. Initially, the locking block is located below the check piece, and the check piece is pressed against the supporting rod. When the movable frame body moves upward, the locking block can extrude and pass through the check piece through the transition surface. Under the action of the elastic force, the check piece is locked below the locking block. A wedge structure is arranged between the check piece and the unlocking piece, and is used to extrude the check piece back when the unlocking piece moves upward.

2. The caustic evaporation apparatus with steam reuse of claim 1, wherein, The wedge structure comprises a wedge surface arranged on the check piece and / or the locking piece.

3. The caustic evaporation apparatus with steam reuse of claim 1, wherein, A circumferential pollution collecting groove is formed on the supporting frame body, and is used to collect impurities falling from the flexible filter piece.

4. The caustic evaporation apparatus with steam reuse of claim 3, wherein, The bottom end of the spiral track is located below the heat exchange tube, so that the supporting frame body and the pollution collecting groove move downward out of the heat exchange tube. The shell is provided with a cleaning liquid inlet communicated with the liquid outlet cavity.

5. The caustic evaporation apparatus with steam reuse of claim 1, wherein, A power device is arranged in the shell and is used to control the rotation of the driving rod.

6. The caustic evaporation apparatus with steam reuse of claim 1, wherein, The shell is provided with a high-temperature gas inlet and a high-temperature gas outlet communicated with the evaporation cavity.

7. The caustic evaporation apparatus with steam reuse of claim 1, wherein, The shell further has a liquid distribution cavity above the evaporation cavity. The top end of the heat exchange tube is communicated with the liquid distribution cavity. A water distributor is arranged in the liquid distribution cavity.

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