Alkali evaporation device capable of recycling steam

Abstract

The invention relates to the technical field of evaporation equipment, and particularly discloses an alkali evaporation device capable of recycling steam, a shell is internally provided with an evaporation cavity and a liquid outlet cavity, a heat exchange tube bundle is arranged in the shell and sequentially penetrates through the evaporation cavity and the liquid outlet cavity, a driving rod is vertically arranged and can rotate, and the driving rod is provided with a spiral track and a plurality of annular tracks which are distributed up and down; a lane changing device capable of elastically twisting is arranged at the junction of the annular track and the spiral track; the top frame and the bottom frame are arranged on the driving rod in a sleeving mode and provided with matching pieces, and the matching pieces can be in sliding fit in the annular track or the spiral track. The flexible filter piece is connected with the top frame and the bottom frame, and a plurality of outward annular creases are reserved on the flexible filter piece. According to the alkali evaporation device capable of recycling steam, through folding and upward moving of the flexible filter part, comprehensive decontamination of the inner wall of the heat exchange pipe is achieved, the cleaning strength is relatively large, and the cleaning effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of evaporation equipment, and in particular to an alkali evaporation device for steam recycling. Background Art

[0002] Liquid alkali evaporation refers to the process of evaporating the water of liquid alkali by heating it under specific conditions, thereby concentrating the alkali solution. Liquid alkali evaporation usually requires the use of an evaporator. According to the properties of the liquid alkali and the evaporation requirements, a suitable evaporator type can be selected, such as a natural evaporator, a mechanical evaporator, a vacuum evaporator, etc. During the evaporation process, some sediment 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, including an evaporation cylinder and a sinking cylinder arranged in parallel up and down, a plurality of heat exchange tubes are fixedly arranged in the evaporation cylinder, an air pipe is arranged on the top of the sinking cylinder, exhaust holes are evenly opened on the air pipe, the exhaust holes are obliquely penetrated from top to bottom to control the airflow discharge angle, and a cleaning strip is arranged on the side adjacent to the exhaust hole. Under the guidance of the exhaust hole, the airflow will turn into an inclined posture, thereby blowing the cleaning strip upward to clean the inner wall of the heat exchange tube and achieve the best cleaning effect. The cleaning strip is made of chemical fiber material, and when blown by the airflow, it can float and shake continuously. The body of the cleaning strip contacts the inner wall of the heat exchange tube and rubs irregularly, thereby sweeping and cleaning the impurities adhering to the inner wall of the heat exchange tube.

[0004] However, when using irregular friction to achieve cleaning, the cleaning form is disordered and irregular, and some areas on the inner wall of the heat exchange tube may not be effectively cleaned by the cleaning strip; when relying on the fluidity of the airflow to make the cleaning strip stick to the inner wall of the heat exchange tube for cleaning, 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 tube, and the cleaning effect is weakened. Summary of the invention The present invention provides an alkali evaporation device for steam reuse, aiming to solve the problem in the related art that a part of the inner wall of a heat exchange tube may not be effectively cleaned and the cleaning effect is weakened.

[0005] The alkali evaporation device for steam reuse of the present invention comprises a shell, a heat exchange tube bundle and a filtrate assembly, wherein the shell has an evaporation chamber and a liquid outlet chamber separated from each other up and down, the heat exchange tube bundle is arranged in the shell and passes through the evaporation chamber and the liquid outlet chamber in sequence 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 element, the driving rod is vertically arranged and rotatable, a spiral track and a plurality of annular tracks distributed up and down are arranged on the driving rod, and an elastically twistable lane changer is arranged at the junction of the annular track and the spiral track; the top frame and The base frames are all sleeved on the driving rods and are provided with matching parts. Initially, the matching parts of the top frame are slidably fitted in the annular track, and the matching parts of the base frame are slidably fitted in the spiral track. When the driving rod rotates, the lane changer can guide the matching parts of the top frame into the spiral track. The flexible filter is cylindrical and connects the top frame and the base frame. A plurality of outward annular folds arranged at vertical intervals are reserved on the flexible filter. When the base frame moves upward relative to the top frame, the flexible filter is folded layer by layer, and its annular folded part contacts the inner wall of the heat exchange tube.

[0006] The effect is that the first matching piece and the second matching piece realize the alternating upward movement of the top frame and the bottom frame, so that the flexible filter can be folded and unfolded back and forth. When folding, the annular folded part of the flexible filter 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 the degree of folding deepens as the bottom frame moves upward, and the squeezing force on the inner wall of the heat exchange tube gradually increases, thereby increasing the cleaning force 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, which improves the cleaning coverage.

[0007] Preferably, the base frame comprises a supporting frame body and a movable frame body, the movable frame body is elastically slidably connected to the supporting frame body in a vertical direction, and the bottom end of the flexible filter element is connected to the movable frame body; a pushing piece is rotatably mounted on the supporting frame body, one end of the pushing piece abuts against the movable frame body, and the other end extends to the inner side of the supporting frame body, and a stop piece is provided on the top frame. When the base 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 provided on the supporting frame body, and the locking piece is used to lock the movable frame body after the movable frame body moves upward, and an unlocking piece is provided on the top frame, and the unlocking piece is used to unlock the locking piece when the top frame moves upward relative to the base frame.

[0008] Preferably, the locking piece includes a locking block and a check piece, the locking block being connected to the movable frame through a support rod, the locking block being provided with an inclined or arc-shaped transition surface; the check piece being elastically slidably connected to the supporting frame along a horizontal direction, the middle part of the check piece being provided with a notch for allowing the support rod to pass through, initially, the locking block being located below the check piece, the check piece being pressed against the support rod, and when the movable frame moves upward, the locking block being able to squeeze over the check piece through the transition surface, and under the action of elastic force, the check piece being locked below the locking block; a wedge-shaped structure being provided between the check piece and the unlocking piece, for squeezing the check piece back when the unlocking piece moves upward.

[0009] Preferably, the wedge-shaped structure comprises a wedge-shaped surface provided on the return stopper and / or the locking member.

[0010] The effect is that after the locking state of the locking block by the check piece is released, the movable frame and the locking block will move downward rapidly under the action of the elastic force, thereby quickly unfolding the flexible filter element and pulling it downward, which can cause the flexible filter element to vibrate, causing the impurities remaining on the flexible filter element to fall off, thereby improving the self-cleaning effect of the flexible filter element and ensuring the reuse of the flexible filter element.

[0011] Preferably, a circumferential dirt collecting groove is formed on the support frame, and the dirt collecting groove is used to collect impurities dropped from the flexible filter element.

[0012] The effect is that the dirt collecting groove temporarily collects the impurities, thus preventing the impurities from scattering around.

[0013] Preferably, the bottom end of the spiral track is located below the heat exchange tube so that the support frame and the dirt collecting groove can move downward out of the heat exchange tube, and the shell is provided with a cleaning liquid inlet connected to the liquid outlet cavity.

[0014] The effect is 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, and then the water filling is stopped, and the water flows out from the liquid outlet cavity, bringing out the impurities collected by the dirt collecting groove, thereby cleaning the dirt collecting groove.

[0015] Preferably, a power device for controlling the rotation of the driving rod is provided in the housing.

[0016] Preferably, the shell is provided with a high temperature gas inlet and a high temperature gas outlet communicated with the evaporation chamber.

[0017] Preferably, the shell further comprises a liquid distribution chamber located above the evaporation chamber, the top end of the heat exchange tube is communicated with the liquid distribution chamber, and a water distributor is provided in the liquid distribution chamber.

[0018] The effect is that the water distributor is used to evenly distribute the alkali solution so that a water film is formed on the inner wall of the heat exchange tube.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The top frame and the bottom frame realize the action of alternately moving upward through the first matching piece and the second matching piece, so that the flexible filter can be folded and unfolded back and forth. When folding, the annular folded part of the flexible filter can scrape the inner wall of the heat exchange tube to achieve cleaning. As the bottom frame moves upward, the folding degree of the annular fold will gradually deepen, the squeezing force on the inner wall of the heat exchange tube will gradually increase, and the posture of the annular fold will be stable, thereby increasing the cleaning force 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, which improves the cleaning coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the alkali evaporation device for steam recycling of the present invention.

[0021] Figure 2 It is a schematic cross-sectional view of an alkali evaporation device for steam recycling according to the present invention.

[0022] Figure 3 The present invention Figure 2 A magnified schematic diagram of center A.

[0023] Figure 4 It is a schematic structural diagram of the driving rod portion of the present invention.

[0024] Figure 5 It is a schematic structural diagram of the top frame to bottom frame portion of the present invention.

[0025] Figure 6 The present invention Figure 5 A magnified schematic diagram of point B in the middle.

[0026] Figure 7 It is a three-dimensional schematic diagram of the non-return member of the present invention.

[0027] Reference numerals: 100, housing; 101, liquid distribution chamber; 101a, raw liquid inlet; 101b, water distributor; 102, evaporation chamber; 102a, high-temperature gas inlet; 102b, high-temperature gas outlet; 103, liquid outlet chamber; 103a, concentrated liquid outlet; 103b, cleaning liquid inlet; 103c, cleaning liquid outlet; 104, installation chamber; 104a, gear set; 200, heat exchange tube bundle; 201, heat exchange tube; 1. Driving rod; 11. Spiral track; 12. Annular track; 13. Lane change plate; 2. Top frame; 21. Disc-shaped structure; 211. First matching piece; 22. Cylindrical structure; 221. Stopper; 222. Unlocking piece; 3. Bottom frame; 31. Support frame; 311. Inner ring frame; 311a. Second matching piece; 312. Connecting rod; 313. Outer ring frame; 313a. Dirt collecting groove; 314. Sleeve frame; 314a. Pushing piece; 32. Movable frame; 321. Tension spring; 322. Stop rod; 4. Flexible filter element; 41. Annular fold; 5. Locking piece; 51. Locking block; 511. Support rod; 512. Transition surface; 52. Check piece; 521. Push spring; 522. Wedge surface. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] Combine the following Figures 1 to 7 The alkali evaporation plant with steam recycling of the present invention is described.

[0030] like Figure 1 and Figure 2 As shown, the alkali evaporation device for steam reuse of the present invention comprises a shell 100, a heat exchange tube bundle 200 and a filtrate assembly.

[0031] The shell 100 has a liquid distribution chamber 101, an evaporation chamber 102 and a liquid outlet chamber 103 arranged from top to bottom. The top of the shell 100 is provided with a raw liquid inlet 101a connected to the liquid distribution chamber 101, which is used to pass the alkali solution to be treated. The liquid distribution chamber 101 is fixed with a water distributor 101b to evenly distribute the alkali solution. The shell 100 is provided with a high-temperature gas inlet 102a and a high-temperature gas outlet 102b connected to the evaporation chamber 102. The high-temperature gas flows into the evaporation chamber 102 from the high-temperature gas inlet 102a, and then flows out of the evaporation chamber 102 from the high-temperature gas outlet 102b. During the flow, a high-temperature environment is formed in the evaporation chamber 102, which is convenient for subsequent evaporation operations. The high-temperature gas can be waste flue gas, steam, etc. 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 103 a communicated with the bottom of the liquid outlet cavity 103 , and a first valve (not shown in the figure) for controlling the opening and closing of the concentrated liquid outlet 103 a may be installed at the concentrated liquid outlet 103 a .

[0032] The heat exchange tube bundle 200 extends vertically and is fixed in the shell 100, with a portion of the tube section located in the evaporation chamber 102 and another portion of the tube section located in the liquid outlet chamber 103. The top of the heat exchange tube 201 in the heat exchange tube bundle 200 is connected to the liquid distribution chamber 101. The alkali liquid passing through the water distributor 101b forms a water film on the inner wall of the heat exchange tube 201. When the water film flows downward, it will exchange heat with the high-temperature gas in the evaporation chamber 102, thereby achieving the purpose of evaporation and concentrating the alkali liquid. Afterwards, the concentrated liquid is discharged into the liquid outlet chamber 103 along the heat exchange tube 201, and then discharged outward from the concentrated liquid outlet 103a.

[0033] Continue to refer Figures 2 to 5 , multiple filtrate components are separately arranged in multiple heat exchange tubes 201, and the filtrate components include a driving rod 1, a top frame 2, a bottom frame 3 and a flexible filter element 4.

[0034] The housing 100 has an installation cavity 104 located below the liquid outlet cavity 103, and the installation cavity 104 and the liquid outlet cavity 103 are separated by a partition fixed on the housing 100. The driving rod 1 is coaxially arranged in the heat exchange tube 201, and the bottom of the driving rod 1 passes through the partition and is rotatably connected to the partition, and then extends into the installation cavity 104. The installation cavity 104 is equipped with a power device, which can be a plurality of motors respectively connected to a plurality of driving rods 1, each motor controls one of the driving rods 1 to rotate; or a single motor, which is connected to each driving rod 1 through a gear set 104a to control each driving rod 1 to rotate synchronously. The driving rod 1 is provided with a spiral track 11 arranged around its axis and a plurality of annular tracks 12 distributed at equal intervals along the vertical direction. A lane changer is provided at the junction of the annular track 12 and the spiral track 11. The lane changer may be an inclined lane changing plate 13 arranged on one side of the spiral track 11. The bottom end of the lane changing plate 13 is hinged to the bottom surface of the annular groove, and a torsion spring is connected therebetween. Alternatively, the lane changing plate 13 is made of an elastic material, and the bottom end is fixedly connected to the bottom surface of the annular groove. It can be torsionally deformed with the bottom end as a fulcrum. The elastic material may be rubber, plastic or metal springs, etc.

[0035] The top frame 2 is composed of a disc-shaped structure 21 located at the top and a cylindrical structure 22 located at the bottom and having a liquid-passing hole. The disc-shaped structure 21 is sleeved on the driving rod 1 and is provided with a matching piece, which is set as a first matching piece 211. Initially, the first matching piece 211 is slidably matched in the annular track 12, and the driving rod 1 rotates ( Figure 4When the direction indicated by the arrow N in the middle is the rotation direction of the driving rod 1, the annular track 12 rotates accordingly. At this time, it can be regarded that the first matching piece 211 slides in the annular track 12, and the first matching piece 211 gradually approaches the lane changing piece 13 until it squeezes the lane changing piece 13 to twist the lane changing piece 13. Then, the top end of the lane changing piece 13 is placed on a side wall of the spiral track 11 and opens a passage to the spiral track 11. The first matching piece 211 can enter the upper spiral track 11 along the lane changing piece 13, thereby achieving the effect of changing lanes from the annular track 12 to the spiral track 11.

[0036] The bottom frame 3 is located below the top frame 2, and includes a support frame 31 and a movable frame 32. The support frame 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 piece, which is set as a second matching piece 311a. Initially, the second matching piece 311a slides and fits in the spiral track 11. When the driving rod 1 rotates, the spiral track 11 rotates accordingly. At this time, it can be regarded that the second matching piece 311a slides and rises in the spiral track 11. The outer ring frame 313 is sleeved on the outer peripheral side of the inner ring frame 311 and is connected to the inner ring frame 311 through the connecting rod 312. The outer ring frame 313 contacts the inner wall of the heat exchange tube 201, and a circumferential dirt collecting groove 313a is formed on the outer ring frame 313. The support frame 31 also includes a sleeve frame 314 fixed to the top surface of the outer ring frame 313. The sleeve frame 314 is sleeved on the outer side of the cylindrical structure 22 with a residual gap between the two. The movable frame 32 is annular and slidably sleeved on the sleeve frame 314. A tension spring 321 is connected between the movable frame 32 and the sleeve frame 314.

[0037] The flexible filter element 4 is cylindrical, and the top and bottom ends are connected to the disc-shaped structure 21 and the movable frame 32 respectively. The flexible filter element 4 can be a filter screen, filter cloth, etc. A plurality of outward annular folds 41 arranged at equal intervals along the vertical direction are reserved on the flexible filter element 4. Initially, the flexible filter element 4 is in an unfolded state, and the evaporated concentrated liquid will flow into the annular gap between the flexible filter element 4 and the inner wall of the heat exchange tube 201, then enter the inner side through the flexible filter element 4, and then flow into the inner side of the cylindrical structure 22 through the liquid hole, and finally flow into the liquid outlet cavity 103. When passing through the flexible filter element 4, the flexible filter element 4 filters the impurities in the concentrated liquid to increase the purity of the concentrated liquid.

[0038] After a period of use, a certain amount of dirt will accumulate and adhere to the inner wall of the heat exchange tube 201, affecting the heat exchange efficiency and, in turn, the evaporation preparation of the alkali solution. At this time, the driving rod 1 can be controlled to rotate. Since the first fitting 211 slides in the annular track 12 and the second fitting 311a slides in the spiral track 11, the height of the top frame 2 does not change at this time, while the bottom frame 3 moves upward. When the bottom frame 3 moves upward, the distance between it and the top frame 2 gradually shortens, and the flexible filter element 4 begins to fold layer by layer. The annular fold 41 partially folds outward and contacts the inner wall of the heat exchange tube 201. Then, the annular fold 41 moves upward with the bottom frame 3 and scrapes off the dirt on the inner wall of the heat exchange tube 201. The dirt enters between two adjacent annular folds 41 and is temporarily retained there. When the base frame 3 moves upward more, the flexible filter element 4 is folded more deeply, the extrusion force between the annular fold 41 and the inner wall of the heat exchange tube 201 is greater, and the posture of the annular fold 41 is stable, thereby increasing the cleaning force on the inner wall of the heat exchange tube 201 and improving the cleaning effect.

[0039] When the first matching piece 211 starts to enter the spiral track 11 from the lane-changing plate 13, the second matching piece 311a just starts to enter the circular track 12. Afterwards, the first matching piece 211 slides in the spiral track 11, the top frame 2 moves up, and the second matching piece 311a slides in the circular track 12, and the height of the bottom frame 3 remains unchanged. When the top frame 2 moves up, the flexible filter element 4 is unfolded again, and the impurities sandwiched between the two adjacent annular folds 41 fall into the dirt collecting groove 313a, and the dirt collecting groove 313a collects them. Similarly, when the driving rod 1 rotates, due to the action of the lane-changing plate 13, the first matching piece 211 and the second matching piece 311a change lanes alternately, and the bottom frame 3 and the top frame 2 move up 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 on the inner wall of the heat exchange tube 201 can be cleaned by the annular folds 41, which improves the coverage of the cleaning.

[0040] Key References Figure 5 In order to ensure that the annular fold 41 is folded outward smoothly, a plurality of blocking rods 322 located on the inner side of the flexible filter element 4 and distributed in a circle are fixed on the movable frame 32. The blocking rods 322 are used to block the annular fold 41 to prevent the annular fold 41 from folding inward when the flexible filter element 4 is folded, thereby ensuring the outward folding of the annular fold 41.

[0041] Continue to refer Figures 5 to 7, an inclined push piece 314a is rotatably mounted on the sleeve 314, the upper end of the push piece 314a is located outside the sleeve 314 and abuts against the bottom surface of the movable frame 32, the lower end of the push piece 314a extends to the inner side of the sleeve 314, and a stopper 221 is fixed on the cylindrical structure 22. When the bottom frame 3 moves upward relative to the top frame 2, the stopper 221 can block the push piece 314a and force the push piece 314a to deflect, and the upper end of the push piece 314a pushes the movable frame 32 upward, so that the movable frame 32 moves upward relative to the sleeve 314, and the tension spring 321 is stretched and stores force.

[0042] The support frame 31 is provided with a locking member 5, which includes a locking block 51 and a check member 52. The locking block 51 is fixedly connected to the bottom surface of the movable frame 32 through a vertical support rod 511, and a transition surface 512 in an inclined or arc shape is provided on the locking block 51. The check member 52 is slidably assembled on the sleeve 314 in the horizontal direction, a push spring 521 is connected between the check member 52 and the sleeve 314, and a notch is provided in the middle part of the check member 52 for the support 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 support rod 511. When the movable frame 32 moves upward, the locking block 51 squeezes the check piece 52 through the transition surface 512, and the check piece 52 retreats and avoids the locking block 51. When the locking block 51 passes over the check piece 52, under the action of the elastic force of the push spring 521, the check piece 52 is pressed against the support rod 511 again. At this time, the check piece 52 is locked under the locking block 51, preventing the locking block 51 from moving back, thereby preventing the movable frame 32 from moving back.

[0043] The cylindrical structure 22 is fixed with an unlocking member 222, and a wedge structure is provided between the unlocking member 222 and the check member 52. The wedge structure includes a wedge surface 522 provided at the free end of the check member 52. Under normal conditions, under the action of the push spring 521, the free end of the check member 52 extends into the inner side of the sleeve frame 314.

[0044] When the top frame 2 moves upward relative to the bottom frame 3, the flexible filter 4 is gradually unfolded, and the unlocking member 222 moves upward with the top frame 2. When the flexible filter 4 is about to be fully unfolded, the unlocking member 222 contacts the wedge surface 522, and the check member 52 is retracted by squeezing the wedge surface 522, and the locking state of the lock block 51 by the check member 52 is released. Under the action of the tension spring 321, the movable frame 32 and the lock block 51 will move downward rapidly. At this time, the movable frame 32 moves downward rapidly relative to the top frame 2, so that the flexible filter 4 is quickly unfolded and pulled downward, which can cause the vibration of the flexible filter 4, so that the impurities remaining on the flexible filter 4 are shaken off downward, thereby improving the self-cleaning effect of the flexible filter 4 and ensuring the reuse of the flexible filter 4.

[0045] Continue to refer Figures 1 to 3The bottom end of the spiral track 11 is located below the heat exchange tube 201. The shell 100 is provided with a cleaning liquid inlet 103b connected to the liquid outlet cavity 103. A second valve for controlling the opening and closing of the cleaning liquid inlet 103b can be installed at the cleaning liquid inlet 103b.

[0046] When the flexible filter element 4 has finished cleaning the inner wall of the heat exchange tube 201 from bottom to top, the driving rod 1 can be reversed, and the first matching piece 211 and the second matching piece 311a will pass through the lane changing piece 13 when sliding, and will be blocked by the lane changing piece 13, and can only slide into the spiral track 11 below, that is, the first matching piece 211 and the second matching piece 311a will move downward along the track of the spiral track 11 until the support frame 31 is taken out of the heat exchange tube 201. At this time, the dirt collecting groove 313a is exposed in the liquid outlet cavity 103, and the cleaning liquid inlet 103b can be opened through the second valve to allow external cleaning liquid or pure water to be poured into the liquid outlet cavity 103, and then the water filling is stopped, and the water flows out of the liquid outlet cavity 103 again, taking out the impurities collected in the dirt collecting groove 313a, so as to clean the dirt collecting groove 313a. In other embodiments, a cleaning liquid outlet 103c connected to the liquid outlet cavity 103 may be opened on the shell 100, and the cleaning liquid outlet 103c and the cleaning liquid inlet 103b are opposite to each other, so that pure water enters from the cleaning liquid inlet 103b and is discharged from the cleaning liquid outlet 103c, forming a flow path, and during the flow, impurities in the dirt collecting groove 313a are carried out.

[0047] In this embodiment, the first matching member 211 and the second matching member 311a may be in the shape of a block, a sphere, etc. The push member 314a may be in the shape of a rod, a strip, etc. The stop member 221 and the unlocking member 222 may be in the shape of a block, a protrusion, etc. The check member 52 may be in the shape of a strip, a rod, etc.

[0048] In other embodiments, the locking block 51 and the support rod 511 in the locking member 5 can be replaced by a ratchet, and the non-return member 52 can be replaced by a pawl. After moving upward, the pawl realizes the non-return function on the ratchet. The wedge surface 522 in the wedge structure can be provided on the unlocking member 222, or the wedge surface 522 can be two, which are provided on the non-return member 52 and the unlocking member 222.

[0049] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An alkali evaporation device for steam recycling, comprising a shell (100) and a heat exchange tube bundle (200), wherein the shell (100) has an evaporation chamber (102) and a liquid outlet chamber (103) separated from each other in an upper and lower direction, and the heat exchange tube bundle (200) is arranged in the shell (100) and passes through the evaporation chamber (102) and the liquid outlet chamber (103) in sequence from top to bottom, characterized in that: It also includes a filtrate assembly arranged in a heat exchange tube (201) of the heat exchange tube bundle (200), the filtrate assembly comprising a drive rod (1), a top frame (2), a bottom frame (3) and a flexible filter element (4), the drive rod (1) being arranged vertically and rotatable, the drive rod (1) being provided with a spiral track (11) and a plurality of annular tracks (12) distributed up and down, a track changer capable of elastic twisting being provided at the junction of the annular track (12) and the spiral track (11); the top frame (2) and the bottom frame (3) are both sleeved on the drive rod (1) and provided with matching parts, and initially, the matching parts of the top frame (2) are The flexible filter element (4) is slidably fitted in the annular track (12), and the matching piece of the bottom frame (3) is slidably fitted in the spiral track (11). When the driving rod (1) rotates, the lane changer can guide the matching piece of the top frame (2) into the spiral track (11). The flexible filter element (4) is cylindrical and connects the top frame (2) and the bottom frame (3). The flexible filter element (4) is provided with a plurality of outwardly facing annular folds (41) arranged at intervals along the vertical direction. When the bottom frame (3) moves upward relative to the top frame (2), the flexible filter element (4) is folded layer by layer, and the annular folds (41) thereof are in contact with the inner wall of the heat exchange tube (201).

2. The alkali evaporation device for steam recycling according to claim 1, characterized in that: The bottom frame (3) comprises a supporting frame (31) and a movable frame (32); the movable frame (32) is elastically slidably connected to the supporting frame (31) in a vertical direction; the bottom end of the flexible filter element (4) is connected to the movable frame (32); a push piece (314a) is rotatably mounted on the supporting frame (31); one end of the push piece (314a) abuts against the movable frame (32); a stop piece (221) is provided on the top frame (2); when the bottom frame (3) moves upward relative to the top frame (2), the stop piece (221) is The blocking member (221) can block the pushing member (314a) and force the pushing member (314a) to deflect, and the pushing member (314a) pushes the movable frame (32) upward; a locking member (5) is provided on the supporting frame (31), and the locking member (5) is used to lock the movable frame (32) after the movable frame (32) moves upward; an unlocking member (222) is provided on the top frame (2), and the unlocking member (222) is used to unlock the locking member (5) when the top frame (2) moves upward relative to the bottom frame (3).

3. The alkali evaporation device for steam reuse according to claim 2, characterized in that: The locking member (5) comprises a locking block (51) and a check member (52); the locking block (51) is connected to the movable frame (32) via a support rod (511); the locking block (51) is provided with an inclined or arc-shaped transition surface (512); the check member (52) is elastically slidably connected to the supporting frame (31) in a horizontal direction; a notch is provided in the middle portion of the check member (52) for the support rod (511) to pass through; initially, the locking block (51) is located at the check member The locking block (51) is located below the locking member (52), the check member (52) is pressed against the support rod (511), and when the movable frame (32) moves upward, the locking block (51) can be squeezed over the check member (52) through the transition surface (512), and under the action of the elastic force, the check member (52) is locked below the locking block (51); a wedge-shaped structure is provided between the check member (52) and the unlocking member (222), and is used to squeeze the check member (52) back when the unlocking member (222) moves upward.

4. The alkali evaporation device for steam reuse according to claim 3, characterized in that: The wedge-shaped structure comprises a wedge-shaped surface (522) provided on the return stopper (52) and / or the locking member (5).

5. The alkali evaporation device for steam reuse according to claim 2, characterized in that: A circumferential dirt collecting groove (313a) is formed on the support frame (31), and the dirt collecting groove (313a) is used to collect impurities dropped from the flexible filter element (4).

6. The alkali evaporation device for steam reuse according to claim 5, characterized in that: The bottom end of the spiral track (11) is located below the heat exchange tube (201) so that the support frame (31) and the dirt collecting groove (313a) can move downward out of the heat exchange tube (201), and the shell (100) is provided with a cleaning liquid inlet (103b) connected to the liquid outlet cavity (103).

7. The alkali evaporation device for steam reuse according to claim 1, characterized in that: A power device for controlling the rotation of the driving rod (1) is provided in the housing (100).

8. The alkali evaporation device for steam reuse according to claim 1, characterized in that: The shell (100) is provided with a high-temperature gas inlet (102a) and a high-temperature gas outlet (102b) which are in communication with the evaporation chamber (102).

9. The alkali evaporation device for steam reuse according to claim 1, characterized in that: The shell (100) further comprises a liquid distribution chamber (101) located above the evaporation chamber (102); the top end of the heat exchange tube (201) is in communication with the liquid distribution chamber (101); and a water distributor (101b) is provided in the liquid distribution chamber (101).

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