Seven-effect tube type falling film evaporator set

Abstract

The utility model discloses a seven-effect tube type falling film evaporator set which comprises seven evaporators, each evaporator comprises an evaporation tank, two tube plates which are distributed up and down are installed in the evaporation tank, a plurality of heat exchange tubes which are evenly distributed and are perpendicular to the tube plates are installed between the two tube plates, a pair of electric push rods is installed at the top of the evaporation tank, and the pair of electric push rods is connected with the evaporation tank. An output rod of the electric push rod is arranged in the evaporation tank and perpendicular to the tube plate, a support is arranged in the evaporation tank and located above the distribution disc, the output rod of the electric push rod is fixed to the support, and conical plugs are arranged at top inlets of all the heat exchange tubes; according to the seven-effect tube type falling film evaporator set, the conical plug is arranged at the top tube opening of the heat exchange tube, then the electric push rod, the support and the connecting rod are matched to control the conical plug to move up and down, and the size of a gap between the conical plug and the tube opening of the heat exchange tube can be adjusted, so that the amount of a solution entering the heat exchange tube is controlled; therefore, the thickness of the liquid film in the heat exchange tube can be quickly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of network equipment protection, in particular to a seven-effect tubular falling film evaporator group. Background Art

[0002] The tubular falling film evaporator is a common evaporation and concentration equipment. It uses gravity to form a liquid film on the solution to be evaporated in the heat exchange tube, and then exchanges heat with the heat medium outside the heat exchange tube, so that the solution evaporates and concentrates. The seven-effect tubular falling film evaporator group is composed of seven tubular evaporators connected together. The steam outlet of the previous evaporator is connected to the heat medium inlet of the next evaporator through a pipe. By using the steam generated by the previous evaporator as the heat exchange medium of the next evaporator, energy saving is achieved. It is widely used in the pharmaceutical, food, chemical, light industry and other industries. During the evaporation and concentration of water or organic solvent solutions, the thickness of the liquid film in the heat exchange tubes of the falling film evaporator directly affects the evaporation and concentration effect of the solution. Generally, the thinner the liquid film in the heat exchange tubes, the better the evaporation and concentration effect of the solution. However, when the concentration of the solution is already relatively high, the solution will begin to saturate in the middle section of the heat exchange tubes. If the solution contains salt, crystallized salt will precipitate in the heat exchange tubes, eventually causing the heat exchange tubes to become clogged. However, the existing seven-effect tubular falling film evaporator group cannot adjust the liquid film thickness in the heat exchange tubes according to different types or concentrations of solutions when in use.

[0003] To this end, we design a seven-effect tubular falling film evaporator group here. Utility Model Content

[0004] The purpose of the utility model is to provide a seven-effect tubular falling film evaporator group to address the deficiencies of the prior art and to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a seven-effect tubular falling film evaporator group, comprising seven evaporators, the evaporator comprising an evaporation tank, two tube sheets distributed up and down are installed inside the evaporation tank, a number of heat exchange tubes evenly distributed and perpendicular to the tube sheets are installed between the two tube sheets, a distribution plate is also installed inside the evaporation tank, the distribution plate is located above the tube sheets, a pair of electric push rods are installed on the top of the evaporation tank, the output rods of the electric push rods are arranged inside the evaporation tank and perpendicular to the tube sheets, a bracket is provided inside the evaporation tank, the bracket is located above the distribution plate, the output rods of the electric push rods are fixed to the bracket, conical plugs are provided at the top inlets of all heat exchange tubes, connecting rods are installed between the tops of all conical plugs and the brackets, and all connecting rods vertically penetrate the distribution plate.

[0006] Preferably, the top and bottom of the evaporator are respectively provided with a first feed port and a first discharge port, and the side of the evaporator is provided with a second feed port, a steam inlet, a condensed water outlet and a second discharge port, the second feed port and the second discharge port are both located below the tube sheet, the steam inlet and the condensed water outlet are both located between the two tube sheets, the steam inlet is close to the upper tube sheet, and the condensed water outlet is close to the lower tube sheet.

[0007] Preferably, the evaporator further includes a water pump, a condensed water tank and a separator, the first discharge port of the evaporator is connected to a first tee, the second interface of the first tee is set as a feeding port, and a first valve is installed on the feeding port, the third interface of the first tee is connected to the water inlet end of the water pump through a pipeline, the third interface of the first tee is installed with a second valve, the water outlet end of the water pump is connected to the first feed port of the evaporator through a pipeline, and the second tee, the third valve and the flow meter are installed on the pipeline in sequence, the second tee is close to the water pump, the condensed water outlet of the evaporator is connected to the condensed water tank through a pipeline, and the second discharge port of the evaporator is connected to the inlet of the separator through a pipeline.

[0008] Preferably, the seven evaporators are arranged side by side, the outlet of the separator of the previous evaporator is connected to the steam inlet of the evaporation tank of the next evaporator through a pipeline, the branch outlet of the second tee of the previous evaporator is connected to the second feed inlet of the evaporation tank of the next evaporator through a pipeline, and a fourth valve is installed on the connecting pipeline.

[0009] Preferably, the second feed port of the evaporation tank of the first evaporator is sealed by a cover, and the steam inlet of the evaporation tank of the first evaporator is connected to an external steam generator through a pipeline.

[0010] Preferably, the branch outlet of the second three-way valve of the last evaporator is set as a discharge outlet, and a fifth valve is installed on the discharge outlet.

[0011] Preferably, the seven-effect tubular falling film evaporator group further includes a cooler, and the tube side inlet of the cooler is connected to the outlet of the separator of the last evaporator through a pipeline.

[0012] Compared with the prior art, the present invention provides a seven-effect tubular falling film evaporator group, which has the following beneficial effects:

[0013] This seven-effect tubular falling film evaporator group is designed to set a conical plug at the top tube mouth of the heat exchange tube. The conical plug is then controlled to move up and down by the cooperation of an electric push rod, a bracket and a connecting rod. The size of the gap between the conical plug and the tube mouth of the heat exchange tube can be adjusted, thereby controlling the amount of solution entering the heat exchange tube, thereby quickly adjusting the thickness of the liquid film in the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the evaporation tank of the utility model;

[0016] Figure 3 This is an enlarged schematic diagram of point A of the present utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the evaporator of the utility model.

[0018] Figure numerals: 1. Evaporator; 11. Evaporation tank; 11-1. First feed port; 11-2. Second feed port; 11-3. First discharge port; 11-4. Steam inlet; 11-5. Condensate outlet; 11-6. Second discharge port; 12. Tube sheet; 13. Heat exchange tube; 14. Distribution plate; 15. Electric push rod; 16. Bracket; 17. Conical plug; 18. Connecting rod; 19. First tee; 110. First valve; 111. Water pump; 112. Second valve; 113. Second tee; 114. Third valve; 115. Flow meter; 116. Condensate tank; 117. Separator; 2. Cooler; 3. Fourth valve; 4. Fifth valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1-4The evaporator 11 is provided with a plurality of tube sheets 12 disposed in a vertical direction and a plurality of heat exchange tubes 13 disposed in a vertical direction. A conical plug 17 is provided at the top entrance of each heat exchange tube 13. A connecting rod 18 is installed between the top of all conical plugs 17 and the bracket 16. All connecting rods 18 vertically penetrate the distribution plate 14. The bracket 16 can be controlled to move up and down by the electric push rod 15, and then all the conical plugs 17 can be driven to move up and down by the connecting rod 18. The upward movement of the conical plug 17 can increase the gap between it and the top tube opening of the heat exchange tube 13, thereby increasing the amount of solution entering the heat exchange tube 13 and making the liquid film formed in the heat exchange tube 13 thicker. The downward movement of the conical plug 17 can reduce the gap between it and the top tube opening of the heat exchange tube 13, thereby reducing the amount of solution entering the heat exchange tube 13 and making the liquid film formed in the heat exchange tube 13 thinner. According to the type or concentration of the solution to be evaporated and concentrated in the evaporator group, the thickness of the liquid film formed in the heat exchange tube 13 can be flexibly adjusted, thereby improving the evaporation and concentration effect when the evaporator group is in use.

[0021] The top and bottom of the evaporation tank 11 are respectively provided with a first feed port 11-1 and a first discharge port 11-3, and the side of the evaporation tank 11 is provided with a second feed port 11-2, a steam inlet 11-4, a condensed water outlet 11-5 and a second discharge port 11-6. The second feed port 11-2 and the second discharge port 11-6 are both located below the tube sheet 12, and the steam inlet 11-4 and the condensed water outlet 11-5 are both located between the two tube sheets 12, with the steam inlet 11-4 close to the upper tube sheet 12 and the condensed water outlet 11-5 close to the lower tube sheet 12.

[0022] The evaporator 1 further includes a water pump 111, a condensed water tank 116 and a separator 117. The first discharge port 11-3 of the evaporation tank 11 is connected to a first tee 19, the second interface of the first tee 19 is set as a feeding port, and a first valve 110 is installed on the feeding port. The third interface of the first tee 19 is connected to the water inlet end of the water pump 111 through a pipeline, and a second valve 112 is installed on the third interface of the first tee 19. The water outlet end of the water pump 111 is connected to the first feeding port 11-1 of the evaporation tank 11 through a pipeline, and the second tee 1 is installed in sequence on the pipeline. 13, the third valve 114 and the flow meter 115, the second three-way valve 113 is close to the water pump 111, the condensate outlet 11-5 of the evaporation tank 11 is connected to the condensate tank 116 through a pipe, and the condensate tank 116 is used to collect the condensate generated after the steam heat exchange. The second discharge port 11-6 of the evaporation tank 11 is connected to the inlet of the separator 117 through a pipe. The first valve 110, the second valve 112 and the third valve 114 are opened, and the water pump 111 is started. The solution to be evaporated can be pumped into the evaporation tank 11, and the solution in the evaporation tank 11 can be circulated in the evaporation tank 11.

[0023] The seven evaporators 1 are arranged side by side. The outlet of the separator 117 of the preceding evaporator 1 is connected to the steam inlet 11-4 of the evaporation tank 11 of the succeeding evaporator 1 via a pipe. Steam evaporated from the solution in the preceding evaporator 1 can be fed into the evaporation tank 11 of the succeeding evaporator 1 as a heat exchange medium, thereby achieving energy conservation and environmental protection. The branch outlet of the second three-way valve 113 of the preceding evaporator 1 is connected to the second feed inlet 11-2 of the evaporation tank 11 of the succeeding evaporator 1 via a pipe. A fourth valve 3 is installed on the connecting pipe. By closing the third valve 114 of the preceding evaporator 1 and opening the fourth valve 3, the solution from the preceding evaporator 1 can be pumped into the succeeding evaporator 1.

[0024] The second feed port 11 - 2 of the evaporation tank 11 of the first evaporator 1 is sealed by a cover, and the steam inlet 11 - 4 of the evaporation tank 11 of the first evaporator 1 is connected to an external steam generator through a pipeline.

[0025] The branch port of the second three-way valve 113 of the last evaporator 1 is set as a discharge port, and the fifth valve 4 is installed on the discharge port. By closing the third valve 114 of the last evaporator 1 and opening the fifth valve 4, the evaporated and concentrated solution can be discharged.

[0026] The seven-effect tubular falling film evaporator group further includes a cooler 2 , the tube side inlet of the cooler 2 is connected to the outlet of the separator 117 of the last evaporator 1 through a pipeline, and the cooler 2 is used to condense the steam discharged from the last evaporator 1 .

[0027] The working principle and use process of the present invention are as follows: When the seven-effect tubular falling film evaporator group is in use, the thickness of the liquid film formed in the heat exchange tube 13 can be adjusted according to the different types or concentrations of the solution. The electric push rod 15 is started, and the bracket 16 is controlled to move up and down by the electric push rod 15. Then, all the conical plugs 17 are driven to move up and down by the connecting rod 18. When the conical plug 17 moves upward, the gap between it and the top nozzle of the heat exchange tube 13 increases, the amount of solution entering the heat exchange tube 13 increases, and the liquid film formed in the heat exchange tube 13 becomes thicker. When the conical plug 17 moves downward, the gap between it and the top nozzle of the heat exchange tube 13 decreases, the amount of solution entering the heat exchange tube 13 decreases, and the liquid film formed in the heat exchange tube 13 becomes thinner.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A seven-effect tubular falling film evaporator group, comprising seven evaporators (1), characterized in that: The evaporator (1) comprises an evaporation tank (11), wherein two tube sheets (12) distributed vertically are installed inside the evaporation tank (11), and a plurality of heat exchange tubes (13) evenly distributed and perpendicular to the tube sheets (12) are installed between the two tube sheets (12). A distribution plate (14) is also installed inside the evaporation tank (11), and the distribution plate (14) is located above the tube sheets (12). A pair of electric push rods (15) are installed on the top of the evaporation tank (11), and the output rods of the electric push rods (15) are arranged A bracket (16) is provided inside the evaporator (11) and perpendicular to the tube sheet (12). The bracket (16) is located above the distribution plate (14). The output rod of the electric push rod (15) is fixed to the bracket (16). Conical plugs (17) are provided at the top entrances of all heat exchange tubes (13). Connecting rods (18) are installed between the tops of all the conical plugs (17) and the bracket (16). All the connecting rods (18) vertically penetrate the distribution plate (14).

2. The seven-effect tubular falling film evaporator assembly according to claim 1, characterized in that: The top and bottom of the evaporation tank (11) are respectively provided with a first feed port (11-1) and a first discharge port (11-3); the side of the evaporation tank (11) is provided with a second feed port (11-2), a steam inlet (11-4), a condensed water outlet (11-5) and a second discharge port (11-6); the second feed port (11-2) and the second discharge port (11-6) are both located below the tube sheet (12); the steam inlet (11-4) and the condensed water outlet (11-5) are both located between the two tube sheets (12); the steam inlet (11-4) is close to the upper tube sheet (12), and the condensed water outlet (11-5) is close to the lower tube sheet (12).

3. The seven-effect tubular falling film evaporator assembly according to claim 2, characterized in that: The evaporator (1) further comprises a water pump (111), a condensed water tank (116) and a separator (117); a first discharge port (11-3) of the evaporation tank (11) is connected to a first tee (19); a second interface of the first tee (19) is set as a feeding port, and a first valve (110) is installed on the feeding port; a third interface of the first tee (19) is connected to the water inlet end of the water pump (111) through a pipeline; a second valve (112) is installed on the third interface of the first tee (19) The water outlet of the water pump (111) is connected to the first feed port (11-1) of the evaporation tank (11) through a pipeline, and a second three-way valve (113), a third valve (114) and a flow meter (115) are sequentially installed on the pipeline. The second three-way valve (113) is close to the water pump (111). The condensed water outlet (11-5) of the evaporation tank (11) is connected to the condensed water tank (116) through a pipeline. The second discharge port (11-6) of the evaporation tank (11) is connected to the inlet of the separator (117) through a pipeline.

4. The seven-effect tubular falling film evaporator assembly according to claim 1, characterized in that: The seven evaporators (1) are arranged side by side, the outlet of the separator (117) of the preceding evaporator (1) is connected to the steam inlet (11-4) of the evaporation tank (11) of the succeeding evaporator (1) via a pipeline, the branch outlet of the second three-way valve (113) of the preceding evaporator (1) is connected to the second feed inlet (11-2) of the evaporation tank (11) of the succeeding evaporator (1) via a pipeline, and a fourth valve (3) is installed on the connecting pipeline.

5. The seven-effect tubular falling film evaporator assembly according to claim 4, characterized in that: The second feed port (11-2) of the evaporation tank (11) of the first evaporator (1) is sealed by a cover, and the steam inlet (11-4) of the evaporation tank (11) of the first evaporator (1) is connected to an external steam generator through a pipeline.

6. The seven-effect tubular falling film evaporator assembly according to claim 4, characterized in that: The branch outlet of the second three-way valve (113) of the last evaporator (1) is set as a discharge outlet, and a fifth valve (4) is installed on the discharge outlet.

7. The seven-effect tubular falling film evaporator assembly according to claim 4, characterized in that: The seven-effect tubular falling film evaporator group further comprises a cooler (2), the tube side inlet of the cooler (2) being connected to the outlet of the separator (117) of the last evaporator (1) through a pipeline.

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