A falling film evaporator for formic acid production

Abstract

The utility model relates to falling film evaporator equipment technical field, proposes a kind of falling film evaporator for formic acid production, including cooling evaporator body and heat preservation mechanism, the heat preservation mechanism includes U-shaped support, the bottom end of U-shaped support is slidably connected with two groups of threaded blocks, the bottom end of threaded block is fixedly connected with connecting block, the bottom end of two groups of connecting block is fixedly connected with heat preservation shell, by driving connecting rod along arc sliding slot sliding drive rubbing block along shell surface sliding, the water drop of condensation is wiped, it is favorable to prevent water drop long time remains in shell surface and forms incrustation, causes corrosion to pipeline junction, it is favorable to improve the service life of present equipment, by setting up heat preservation pipe in shell bottom end, steam flows in heat preservation pipe, the bottom of shell is heated, it is favorable to reduce the temperature difference of shell interior upper side and lower side, make shell interior temperature more uniform, improve evaporation effect, and can fully utilize to reach the effect of energy saving to heat energy.

Description

Technical Field

[0001] This utility model relates to the technical field of falling film evaporator equipment, specifically, to a falling film evaporator for formic acid production. Background Technology

[0002] Falling film evaporation involves adding the feed liquid from the upper tube box of the heating chamber of the falling film evaporator. The liquid is then evenly distributed into each heat exchange tube by a liquid distribution and film-forming device. Under the influence of gravity, vacuum induction, and airflow, the liquid forms a uniform film that flows downwards. During this flow, the liquid is heated and vaporized by the shell-side heating medium. The resulting vapor and liquid phase enter the separation chamber of the evaporator together, where they are thoroughly separated. The vapor either enters the condenser for condensation or enters the next effect evaporator as a heating medium, thus achieving multi-effect operation. The liquid phase is discharged from the separation chamber.

[0003] Chinese patent CN216418335U provides a falling film evaporator, including an evaporator tank. The evaporator tank has a feed pipe and a steam outlet pipe at the top, a steam inlet pipe at the bottom, and a discharge pipe at the bottom. The discharge pipe is equipped with a valve. However, hot air has a low density. According to thermodynamic principles, gases with lower density will rise, which may cause uneven temperature inside the falling film evaporator, affecting the evaporation effect of the equipment. In addition, water droplets may condense on the outer wall of the falling film evaporator due to temperature differences. If not cleaned in time, scale may be generated or the weld joints may be corroded, which is not conducive to extending the service life of the equipment.

[0004] Therefore, this utility model provides a falling film evaporator for formic acid production to solve the above problems. Utility Model Content

[0005] This invention proposes a falling film evaporator for formic acid production. By using a wiping block that can slide along an arc-shaped groove to wipe the outer wall of the falling film evaporator, water droplets condensed due to temperature differences can remain on the outer wall. By installing a heat-insulating pipe at the bottom of the falling film evaporator to heat the bottom of the shell, the temperature difference between the upper and lower parts of the shell is reduced, thereby improving the evaporation effect and solving the problems in related technologies.

[0006] The technical solution of this utility model is as follows:

[0007] A falling film evaporator for formic acid production includes a cooling evaporator body and a heat preservation mechanism. The heat preservation mechanism includes a U-shaped support, with two sets of threaded blocks slidably connected to the bottom end of the U-shaped support. Connecting blocks are fixedly connected to the bottom ends of the threaded blocks, and heat preservation shells are fixedly connected to the bottom ends of the two sets of connecting blocks. Fixing blocks are provided on the two sets of heat preservation shells, and a wiping block is provided at one end of each fixing block. The falling film evaporator body includes an outer shell, with four sets of inclined partitions fixedly connected inside the outer shell. Each pair of adjacent partitions is inclined in opposite directions. A discharge plate is provided below each partition, and a heat preservation pipe is fixedly connected inside the outer shell.

[0008] Optionally, a threaded rod is rotatably connected to the U-shaped bracket, one end of which passes through the U-shaped bracket and is fixedly connected to a motor. The motor is fixedly connected to the U-shaped bracket, and two sets of threaded blocks are threadedly connected to the threaded rod, with the threads on the two sets of threaded blocks arranged symmetrically.

[0009] Optionally, a second rotating shaft is rotatably connected to the top center of the two sets of insulation shells. A connecting rod and a driven gear are fixedly connected to the second rotating shaft. An electric motor is fixedly connected to the insulation shell. A driving gear is fixedly connected to the output end of the electric motor. The driving gear meshes with the driven gear.

[0010] Optionally, both sets of the heat insulation shells are provided with arc-shaped sliding grooves, and a first rotating shaft is slidably connected to the arc-shaped sliding grooves. The first rotating shaft is fixedly connected to the connecting rod, and one end of the first rotating shaft passes through the arc-shaped sliding groove and is fixedly connected to a fixing block.

[0011] Optionally, three sets of evenly arranged telescopic sleeves are fixedly connected to the ends of the two sets of fixed blocks away from the insulation shell, and a wiping block is fixedly connected to the output end of the telescopic sleeve, with the output end of the wiping block in close contact with the outer shell.

[0012] Optionally, a first feed pipe is fixedly connected to one side of the upper outer wall of the outer shell, a second discharge pipe is fixedly connected to one side of the lower outer wall of the outer shell, a steam outlet pipe and the first discharge pipe are fixedly connected from top to bottom to the other side of the lower outer wall of the outer shell, and a steam inlet pipe is fixedly connected to the bottom end of the outer shell.

[0013] Optionally, one end of the insulation pipe is installed on the other side of the inner wall of the outer shell, and the other end of the insulation pipe is fixedly connected to the steam outlet pipe.

[0014] Optionally, each set of partitions has several sets of evenly distributed through holes at its lower part. One set of partitions is fixedly connected to an electric telescopic rod, and the output end of the electric telescopic rod is fixedly connected to a slider. The slider is slidably connected to the partition. A second discharge pipe is installed at the lower part of the partition. The other end of the second discharge pipe is fixedly connected to a circulation pump. The output end of the circulation pump is fixedly connected to a second feed pipe. The other end of the second feed pipe is fixedly connected to a first feed pipe.

[0015] Optionally, a first discharge pipe is installed at the lower part of the discharge plate, and four sets of support legs are fixedly connected to the bottom of the outer shell.

[0016] The working principle and beneficial effects of this utility model are as follows:

[0017] 1. In this utility model, the wiping block slides along the outer shell surface by driving the connecting rod along the arc-shaped groove to wipe the condensed water droplets. This helps to prevent water droplets from remaining on the outer shell surface for a long time and forming scale, which can cause corrosion at pipe connections and improve the service life of the equipment.

[0018] 2. In this utility model, by setting a heat insulation pipe at the bottom of the outer shell, steam flows in the heat insulation pipe to heat the bottom of the outer shell, which helps to reduce the temperature difference between the top and bottom of the outer shell, making the temperature inside the outer shell more uniform, improving the evaporation effect, and making full use of heat energy to achieve the effect of saving energy. Attached Figure Description

[0019] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0020] Figure 1 This is a front view of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the insulation mechanism of this utility model;

[0022] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure of region A in the middle;

[0023] Figure 4 This is a cross-sectional view of the main body structure of the falling film evaporator of this utility model;

[0024] Figure 5 This utility model Figure 4 Enlarged schematic diagram of the structure of region B in the middle.

[0025] In the diagram: 1. Falling film evaporator body; 101. Outer shell; 102. Support leg; 103. Steam inlet pipe; 104. Steam outlet pipe; 105. First feed pipe; 106. First discharge pipe; 107. Second discharge pipe; 108. Circulation pump; 109. Second feed pipe; 110. Baffle plate; 111. Outlet plate; 112. Insulation pipe; 113. Through hole; 114. Electric telescopic rod; 115. Sliding block; 2. Insulation mechanism; 201. U-shaped bracket; 202. Motor; 203. Threaded rod; 204. Threaded block; 205. Connecting block; 206. Insulation shell; 207. Arc-shaped slide groove; 208. First rotating shaft; 209. Connecting rod; 210. Second rotating shaft; 211. Electric motor; 212. Drive gear; 213. Driven gear; 214. Fixing block; 215. Telescopic sleeve; 216. Wiping block. Detailed Implementation

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0027] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Example 1

[0031] Reference Figures 1-3This first embodiment of the present invention proposes a falling film evaporator for formic acid production, comprising a cooling evaporator body 1 and a heat preservation mechanism 2. The heat preservation mechanism 2 includes a U-shaped support 201, with two sets of threaded blocks 204 slidably connected to the bottom end of the U-shaped support 201. Connecting blocks 205 are fixedly connected to the bottom end of the threaded blocks 204, and heat preservation shells 206 are fixedly connected to the bottom ends of the two sets of connecting blocks 205. Fixing blocks 214 are provided on the two sets of heat preservation shells 206, and a wiping block 216 is provided at one end of each fixing block 214. By setting the heat preservation shells 206... 6. This design helps reduce heat loss and improve the utilization rate of steam thermal energy. The falling film evaporator body 1 includes an outer shell 101. Four sets of inclined baffles 110 are fixedly connected inside the outer shell 101. The inclination directions of each pair of adjacent baffles 110 are opposite. An outlet plate 111 is provided below the baffles 110. An insulation pipe 112 is fixedly connected inside the outer shell 101. By setting baffles 110 with opposite inclination directions, the raw materials flow out sequentially under the action of gravity, allowing the raw materials to flow smoothly from the top of the outer shell 101 to the bottom of the outer shell 101.

[0032] A threaded rod 203 is rotatably connected to the U-shaped bracket 201. One end of the threaded rod 203 passes through the U-shaped bracket 201 and is fixedly connected to a motor 202. The motor 202 is fixedly connected to the U-shaped bracket 201. Two sets of threaded blocks 204 are threadedly connected to the threaded rod 203, and the threads on the two sets of threaded blocks 204 are symmetrically arranged. By driving the motor 202 to drive the threaded rod 203 to rotate, the two sets of threaded blocks 204 slide in opposite directions, thereby moving the two sets of insulation shells 206, which facilitates the maintenance of the falling film evaporator body by the staff.

[0033] A second rotating shaft 210 is rotatably connected to the middle of the top of each of the two sets of insulation shells 206. A connecting rod 209 and a driven gear 213 are fixedly connected to the second rotating shaft 210. An electric motor 211 is fixedly connected to each insulation shell 206. A driving gear 212 is fixedly connected to the output end of the electric motor 211. The driving gear 212 meshes with the driven gear 213. Both sets of insulation shells 206 are provided with arc-shaped sliding grooves 207. A first rotating shaft 208 is slidably connected to the arc-shaped sliding grooves 207. The first rotating shaft 208 is fixedly connected to the connecting rod 209. One end of the first rotating shaft 208 passes through the arc-shaped sliding grooves 207 and is fixedly connected to a fixing block 214. By driving the electric motor 211 to rotate, the driving gear 212 is driven to rotate. The driving gear 212 meshes with the driven gear 213 and rotates, driving the connecting rod 209 to rotate, so that the connecting rod 209 slides along the arc-shaped sliding grooves 207.

[0034] Three sets of evenly arranged telescopic sleeves 215 are fixedly connected to the ends of the two sets of fixed blocks 214 away from the insulation shell 206. The output ends of the telescopic sleeves 215 are fixedly connected to the wiping blocks 216. The output ends of the wiping blocks 216 are in close contact with the outer shell 101. The connecting rod 209 rotates, causing the fixed blocks 214 to rotate and causing the wiping blocks 216 to slide and wipe the surface of the outer shell 101. This prevents water droplets from condensing on the surface of the outer shell 101 from remaining on the surface of the outer shell 101 and forming scale, which would corrode the pipe connections and affect the service life of the equipment. By setting the telescopic sleeves 215, it is easier to make the wiping blocks 216 fit tightly against the outer wall of the outer shell 101 for cleaning.

[0035] In this embodiment, the drive motor 202 drives the threaded rod 203 to rotate, causing two sets of threaded blocks 204 to slide in opposite directions, which in turn moves the two sets of insulation shells 206, allowing the protective shells 206 to move closer to or further away from the outer shell 101, facilitating maintenance of the falling film evaporator body by the staff. The drive motor 211 drives the drive gear 212 to rotate, and the drive gear 212 meshes with the driven gear 213 to rotate, causing the connecting rod 209 to rotate. The connecting rod 209 slides along the arc-shaped slide groove 207, causing the fixed block 214 to rotate, which in turn causes the wiping block 216 to slide and wipe the surface of the outer shell 101, preventing water droplets from condensing on the surface of the outer shell 101 from forming scale, which could corrode the pipe connections and affect the service life of the equipment.

[0036] Example 2

[0037] Reference Figures 1-5 This is the second embodiment of the present invention, which differs from the first embodiment in that: a first feed pipe 105 is fixedly connected to one side of the upper outer wall of the outer shell 101, a second discharge pipe 107 is fixedly connected to one side of the lower outer wall of the outer shell 101, a steam outlet pipe 104 and a first discharge pipe 106 are fixedly connected from top to bottom to the other side of the lower outer wall of the outer shell 101, and a steam inlet pipe 103 is fixedly connected to the bottom end of the outer shell 101; the first feed pipe 105 is provided to transport raw materials into the interior of the outer shell 101, and the raw materials fall sequentially to the front end of the second discharge pipe 107 through the partition 110, and are discharged through the first discharge pipe 106 after passing the test;

[0038] One end of the heat insulation pipe 112 is installed on the other side of the upper inner wall of the outer shell 101, and the other end of the heat insulation pipe 112 is fixedly connected to the steam outlet pipe 104. The heat insulation pipe 112 is installed on the lower inner wall of the outer shell 101. Since hot air has a lower density, according to the thermodynamic principle, gases with lower density will rise, which may cause uneven temperature inside the outer shell 101. By setting the heat insulation pipe 112, steam flows in the heat insulation pipe 112 to heat the bottom of the outer shell 101, thereby increasing the temperature of the bottom of the shell, reducing the temperature difference between the upper and lower parts of the shell, improving the evaporation effect, reducing the temperature difference inside the shell, and thus improving the liquid concentration effect.

[0039] Each set of partitions 110 has several evenly distributed through holes 113 at its lower part. One set of partitions 110 is fixedly connected to an electric telescopic rod 114. The output end of the electric telescopic rod 114 is fixedly connected to a slider 115, which is slidably connected to the partition 110. A second discharge pipe 107 is installed at the lower part of the partition 110. The other end of the second discharge pipe 107 is fixedly connected to a circulation pump 108. The output end of the circulation pump 108 is fixedly connected to a second feed pipe 109, and the other end of the second feed pipe 109 is fixedly connected to a first feed pipe 105. Through a drive... The electric telescopic rod 114 drives the slider 115 to slide and block the through hole 113. When the purity of the raw material is not up to standard, it prevents it from being discharged from the equipment through the outlet plate 111. The raw material is then transported back to the top of the outer shell 101 by the circulating pump 108 for evaporation. When the purity is up to standard, the electric telescopic rod 114 drives the slider 115 to slide into the partition plate 110, so that the qualified raw material falls through the through hole 113 onto the outlet plate 111 below and is discharged through the first discharge pipe 106. The first discharge pipe 106 is installed at the bottom of the outlet plate 111, and four sets of support legs 102 are fixedly connected to the bottom of the outer shell 101.

[0040] In this embodiment, by installing the heat insulation pipe 112 on the lower inner wall of the outer shell 101, steam flows inside the heat insulation pipe 112 to heat the bottom of the outer shell 101, thereby increasing the temperature of the bottom of the shell, reducing the temperature difference between the upper and lower parts of the shell, improving the evaporation effect, and reducing the temperature difference inside the shell, thereby improving the liquid concentration effect; by driving the electric telescopic rod 114 to drive the slider 115 to slide and block the through hole 113, when the purity of the raw material is not qualified, it is prevented from being discharged from the equipment through the outlet plate 111, so that the raw material is re-transported to the top of the outer shell 101 by the circulation pump 108 for evaporation. When the purity is qualified, by driving the electric telescopic rod 114 to drive the slider 115 to slide into the partition plate 110, so that the qualified raw material falls through the through hole 113 onto the outlet plate 111 below and is discharged through the first discharge pipe 106.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A falling film evaporator for formic acid production, comprising a falling film evaporator body (1) and a heat preservation mechanism (2), characterized in that, The heat preservation mechanism (2) includes a U-shaped bracket (201), with two sets of threaded blocks (204) slidably connected to the bottom end of the U-shaped bracket (201). A connecting block (205) is fixedly connected to the bottom end of the threaded block (204), and a heat preservation shell (206) is fixedly connected to the bottom end of the two sets of connecting blocks (205). A fixing block (214) is provided on the two sets of heat preservation shells (206), and a wiping block (216) is provided at one end of the fixing block (214). The falling film evaporator body (1) includes an outer shell (101), and four sets of inclined partitions (110) are fixedly connected inside the outer shell (101). The inclination directions of each pair of adjacent partitions (110) are opposite. An outlet plate (111) is provided below the partition (110), and a heat insulation pipe (112) is fixedly connected inside the outer shell (101).

2. The falling film evaporator for formic acid production according to claim 1, characterized in that, A threaded rod (203) is rotatably connected to the U-shaped bracket (201). One end of the threaded rod (203) passes through the U-shaped bracket (201) and is fixedly connected to a motor (202). The motor (202) is fixedly connected to the U-shaped bracket (201). Two sets of threaded blocks (204) are threadedly connected to the threaded rod (203), and the threads on the two sets of threaded blocks (204) are symmetrically arranged.

3. A falling film evaporator for formic acid production according to claim 1, characterized in that, The top center of the two sets of heat insulation shells (206) is rotatably connected to a second rotating shaft (210). A connecting rod (209) and a driven gear (213) are fixedly connected to the second rotating shaft (210). An electric motor (211) is fixedly connected to the heat insulation shell (206). A driving gear (212) is fixedly connected to the output end of the electric motor (211). The driving gear (212) meshes with the driven gear (213).

4. A falling film evaporator for formic acid production according to claim 1, characterized in that, Both sets of the heat insulation shells (206) are provided with arc-shaped sliding grooves (207), and a first rotating shaft (208) is slidably connected to the arc-shaped sliding grooves (207). The first rotating shaft (208) is fixedly connected to the connecting rod (209), and a fixing block (214) is fixedly connected to one end of the first rotating shaft (208) through the arc-shaped sliding grooves (207).

5. A falling film evaporator for formic acid production according to claim 4, characterized in that, Three sets of evenly arranged telescopic sleeves (215) are fixedly connected to the ends of the two sets of fixed blocks (214) away from the heat insulation shell (206). A wiping block (216) is fixedly connected to the output end of the telescopic sleeve (215), and the output end of the wiping block (216) is in close contact with the outer shell (101).

6. A falling film evaporator for formic acid production according to claim 1, characterized in that, A first feed pipe (105) is fixedly connected to one side of the upper outer wall of the outer shell (101), a second discharge pipe (107) is fixedly connected to one side of the lower outer wall of the outer shell (101), a steam outlet pipe (104) and a first discharge pipe (106) are fixedly connected from top to bottom on the other side of the lower outer wall of the outer shell (101), and a steam inlet pipe (103) is fixedly connected to the bottom end of the outer shell (101).

7. A falling film evaporator for formic acid production according to claim 1, characterized in that, One end of the insulation pipe (112) is installed on the other side of the inner wall of the outer shell (101), and the other end of the insulation pipe (112) is fixedly connected to the steam outlet pipe (104).

8. A falling film evaporator for formic acid production according to claim 1, characterized in that, Each set of partitions (110) has several sets of evenly distributed through holes (113) at its lower part. An electric telescopic rod (114) is fixedly connected to one set of partitions (110). A slider (115) is fixedly connected to the output end of the electric telescopic rod (114). The slider (115) is slidably connected to the partition (110). A second discharge pipe (107) is installed at the lower part of the partition (110). A circulation pump (108) is fixedly connected to the other end of the second discharge pipe (107). A second feed pipe (109) is fixedly connected to the output end of the circulation pump (108). The other end of the second feed pipe (109) is fixedly connected to the first feed pipe (105).

9. A falling film evaporator for formic acid production according to claim 1, characterized in that, The first discharge pipe (106) is installed at the lower part of the discharge plate (111), and four sets of support legs (102) are fixedly connected to the bottom of the outer shell (101).

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