Waste water evaporator utilizing waste heat

Abstract

A waste water evaporator utilizing waste heat comprises an evaporating tank, a first water inlet pipe, a first water outlet pipe, a salt discharging pipe and a heating assembly. The interior of the evaporation tank is hollow, and a baffle is further inserted into the evaporation tank and divides an inner cavity of the evaporation tank into an evaporation cavity and a condensation cavity; the device further comprises a detection assembly. The detection assembly at least comprises a water level monitoring device and a salt layer monitoring device; the at least two water level monitoring devices are arranged on the evaporation tank in a penetrating manner, and one of the water level monitoring devices is aligned to the evaporation cavity; the other water level monitoring device is aligned to the condensation cavity; the salt layer monitoring device is arranged on the evaporation tank in a penetrating manner and is close to the salt discharging pipe so as to detect the height of crystal accumulation around the salt discharging pipe; according to the utility model, the detection assembly is arranged, so that a worker can judge the evaporation condition in the evaporation tank by observing the water level condition and the crystallization layer accumulation condition all the time, and further can judge when operations such as water adding, water discharging and salt discharging are needed.

Description

Technical Field

[0001] The utility model relates to the field of wastewater evaporators, in particular to a wastewater evaporator utilizing waste heat. Background Art

[0002] The wastewater evaporator is based on the principle of evaporation, concentration and crystallization, aiming at the high salt and high concentration of chemical organic wastewater. It adopts multi-effect vacuum evaporation to concentrate and crystallize organic wastewater. After separating the salt in the concentrate, it is recovered through a salt collector, and the concentrate is dried, recovered or incinerated. The condensed water after evaporation is generally treated by subsequent biochemical treatment to achieve the wastewater discharge standard.

[0003] The essential part of the wastewater evaporator is the heating component, which needs to rely on the heat of the heating component to complete the process of wastewater evaporation. Since heating is required, energy consumption is essential.

[0004] Among them, the Chinese patent with patent number ZL 202322010604.1 discloses: "A wastewater evaporator, relating to the technical field of evaporators. The application includes a shell, which is provided with a water inlet and an outlet, and a heating pipe is installed at the bottom of the shell, and also includes: a stirring member installed on the shell, and the stirring member is used to stir the wastewater. The application heats the wastewater inside the shell through a heating pipe, and a stirring member and a swinging member are installed in the shell to increase the activity of the wastewater in the shell. When in use, it is convenient to mix wastewater of different temperatures, and the heated steam in the shell is used to heat the inside of the interlayer through the cooperation of the heat-conducting member, so that the interlayer transfers the heat to the shell evenly, thereby increasing the heating effect of the shell on the wastewater";

[0005] However, including the solutions described in the above patents, the wastewater evaporators in the prior art generally adopt low-temperature heating, so the heating efficiency of the heating components in the wastewater evaporator is not required to be high. In general, the amount of waste heat generated in chemical enterprises is also very large. Therefore, wastewater evaporators that can use waste heat recovery devices as heating components have begun to appear on the market.

[0006] However, the above-mentioned wastewater evaporator utilizing waste heat has a disadvantage that, since the existing waste heat recovery device is generally large in size, it will occupy most of the volume of the wastewater evaporator. In this case, the water level monitoring and crystal layer monitoring functions in this type of wastewater evaporator are relatively lacking, and the evaporation situation in the evaporator cannot be observed in real time. Summary of the invention

[0007] In order to overcome the deficiency of the wastewater evaporator utilizing waste heat in the prior art that it lacks the internal water level and crystal layer monitoring function, the utility model provides a wastewater evaporator utilizing waste heat.

[0008] The utility model solves the technical problem by providing a wastewater evaporator utilizing waste heat, comprising:

[0009] The evaporator is hollow inside and a baffle is inserted inside the evaporator. The baffle divides the internal cavity of the evaporator into an evaporation cavity and a condensation cavity. A steam gap is provided between the evaporation cavity and the condensation cavity.

[0010] A first water inlet pipe, a first water outlet pipe and a salt discharge pipe, all of which are connected to the evaporation tank, wherein the first water inlet pipe and the salt discharge pipe are both connected to the evaporation chamber, and the first water outlet pipe is connected to the condensation chamber;

[0011] A heating component connected to one side of the evaporation tank and extending into the evaporation chamber;

[0012] Also includes:

[0013] A detection component, which at least includes a water level monitoring device and a salt layer monitoring device;

[0014] The water level monitoring devices include at least two, and both are installed on the evaporation tank, and one of the water level monitoring devices is arranged to align with the evaporation chamber to detect the water level in the evaporation chamber; the other water level monitoring device is arranged to align with the condensation chamber to detect the water level in the condensation chamber;

[0015] The salt layer monitoring device is installed on the evaporation tank and is arranged close to the salt discharge pipe to detect the height of crystal accumulation around the salt discharge pipe.

[0016] Furthermore, the water level monitoring device includes two radar level gauges, both of which are installed on the top of the evaporation tank, one of which is located above the evaporation chamber, and the other is located above the condensation chamber; the salt layer monitoring device includes a pressure sensor and a plurality of photoelectric switches; the pressure sensor is installed on the bottom of the evaporation tank and is located on one side of the salt discharge pipe; the photoelectric switches are installed on the side wall of the evaporation tank and are arranged in sequence from the salt discharge pipe upward.

[0017] Furthermore, a guide portion is provided at the bottom of the evaporation tube, the guide portion is located below the evaporation chamber, and the inner wall of the guide portion is in a funnel shape with a diameter gradually decreasing downward, and the salt discharge pipe is provided at the bottom of the guide portion.

[0018] Furthermore, the pressure sensor is disposed on the side wall of the guide portion.

[0019] Furthermore, the heating component includes a heat exchange head connected to one side of the evaporator and a plurality of heat exchange tubes passing through the evaporation chamber of the evaporator, a partition plate is arranged in the heat exchange head, and the partition plate divides the interior of the heat exchange head into an isolated process chamber and an outlet chamber, one end of the heat exchange tube is connected to the process chamber, and the other end is connected to the outlet chamber; the heat exchange head is also connected to a second water inlet pipe connected to the process chamber, and a second water outlet pipe connected to the outlet chamber.

[0020] Furthermore, the heating component preferably includes a tube sheet, which is clamped between the heat exchange head and the evaporator, both ends of the heat exchange tube are connected to the tube sheet, and a plurality of support plates are also arranged in the evaporation chamber of the evaporator, and the heat exchange tube is passed through the support plates.

[0021] Furthermore, the evaporation chamber includes a narrow section, a wide section and a transition section, the diameter of the wide section is larger than the diameter of the wide section, the transition section is connected between the narrow section and the wide section, the diameter of the transition section gradually increases from the narrow section to the wide section, the narrow section is arranged close to the heating component, and the wide section is connected to the condensation chamber.

[0022] Furthermore, the evaporation tank is also connected to a third water outlet pipe, the third water outlet pipe is communicated with the evaporation chamber, and is located below the narrow section of the evaporation chamber.

[0023] Furthermore, the side of the evaporation tank is also connected with a manhole pipe communicating with the interior thereof.

[0024] The evaporation method of the utility model is as follows: first, the waste water to be evaporated is input through the first water inlet pipe and stored in the evaporation chamber of the evaporation tank, and then the liquid carrying the residual heat is input from the second water inlet pipe into the process chamber of the heat exchange head, and the liquid carrying the residual heat flows from the process chamber to the outlet chamber through the heat exchange pipe, and in the process of the liquid carrying the residual heat passing through the heat exchange pipe, it will come into the evaporation chamber of the evaporation tank, and the residual heat in the liquid will be transferred to the stored waste water to achieve heating of the waste water, and the liquid whose residual heat has been recovered will be discharged from the outlet chamber through the second water outlet pipe, and when the waste water is heated, it will evaporate and generate steam to rise, and the crystals left by the evaporation will be deposited in the evaporation chamber, and then the steam will move to the condensation chamber through the steam gap and condense to form condensed water, which can be stored in the condensation chamber or discharged through the first water outlet pipe, and the crystals accumulated at the bottom of the evaporation chamber will gradually gather toward the guide part under the action of the waste water flow, and finally be discharged through the salt discharge pipe.

[0025] During the evaporation of wastewater, part of the steam will move to the narrow section of the evaporation chamber. Since a support plate of the heating component is provided at the narrow section, part of the steam will be retained in the narrow section of the evaporation chamber and condensed into condensed water. When the condensed water accumulates to a certain amount, it can be discharged through the third water outlet pipe.

[0026] The detection method of the utility model is as follows: two radar level gauges respectively display the liquid level heights in the evaporation chamber and the condensation chamber in real time; and the accumulation amount of the crystal layer needs to be detected by a photoelectric switch to detect the height of the crystal layer, and then by a pressure sensor to detect the weight of the crystal layer, and the two are combined to determine the accumulation amount of the crystal layer.

[0027] The beneficial effects of the utility model are:

[0028] 1. A detection component is provided, which includes a water level monitoring device for detecting the water level and a salt layer monitoring device for detecting the accumulation of the crystal layer, so that the staff can always judge the evaporation situation in the evaporation tank by observing the water level and the accumulation of the crystal layer, and then judge when it is necessary to add water, drain water and discharge salt;

[0029] 2. The salt layer monitoring device includes a photoelectric switch for detecting the height of the crystal layer and a pressure sensor for detecting the weight of the crystal layer. By combining the detection data of the two, the accumulation of the crystal layer can be more accurately obtained, which is convenient for the staff to make judgments;

[0030] 3. The heating component is set as a heat exchanger, through which the waste heat in the liquid can be effectively recovered for heating the waste water, thereby improving the utilization rate of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the utility model.

[0032] Figure 2 It is a disassembled schematic diagram of the evaporation tank and the heating component of the utility model.

[0033] Figure 3 It is an explosion schematic diagram of the evaporation tank in the utility model.

[0034] Figure 4 It is an exploded schematic diagram of the heating component in the utility model.

[0035] Figure 5 It is a cross-sectional view of one direction of the utility model.

[0036] Figure 6 It is a cross-sectional view of the utility model from another direction.

[0037] Numbers in the figure: 1. evaporator; 2. baffle plate; 3. evaporation chamber; 4. condensation chamber; 5. steam gap; 6. first water inlet pipe; 7. first water outlet pipe; 8. salt discharge pipe; 9. heating component; 10. water level monitoring device; 11. salt layer monitoring device; 12. radar level gauge; 13. pressure sensor; 14. photoelectric switch; 15. guide part; 16. heat exchange head; 17. heat exchange tube; 18. step plate; 19. process chamber; 20. outlet chamber; 21. second water inlet pipe; 22. second water outlet pipe; 23. tube sheet; 24. support plate; 25. narrow section; 26. wide section; 27. transition section; 28. third water outlet pipe; 29. ​​manhole pipe; 30. insertion port. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0040] Example

[0041] Combination Figures 1 to 6A wastewater evaporator utilizing waste heat is shown, comprising an evaporation tank 1, a first water inlet pipe 6, a first water outlet pipe 7, a salt discharge pipe 8 and a heating component 9; the evaporation tank 1 is hollow inside, and a baffle plate 2 is inserted into the evaporation tank 1, the baffle plate 2 divides the internal cavity of the evaporation tank 1 into an evaporation chamber 3 and a condensation chamber 4, and a steam gap 5 is also provided between the evaporation chamber 3 and the condensation chamber 4; the first water inlet pipe 6, the first water outlet pipe 7 and the salt discharge pipe 8 are all connected to the evaporation tank 1, wherein the first water inlet pipe 6 and the salt discharge pipe 8 are both connected to the evaporation chamber 3, and the first water outlet pipe 7 is connected to the condensation chamber 4; the heating component 9 It is connected to one side of the evaporation tank 1 and extends into the evaporation chamber 3; it also includes a detection component; the detection component at least includes a water level monitoring device 10 and a salt layer monitoring device 11; the water level monitoring device 10 includes at least two, and both are arranged on the evaporation tank 1, and one of the water level monitoring devices 10 is arranged to align with the evaporation chamber 3 to detect the water level height in the evaporation chamber 3; the other water level monitoring device 10 is arranged to align with the condensation chamber 4 to detect the water level height in the condensation chamber 4; the salt layer monitoring device 11 is arranged on the evaporation tank 1 and is arranged close to the salt discharge pipe 8 to detect the height of crystal accumulation around the salt discharge pipe 8.

[0042] Combination Figure 1 and Figure 3 As shown, the water level monitoring device 10 described in this embodiment includes two radar level gauges 12, both of which are installed on the top of the evaporation tank 1, one of which is located above the evaporation chamber 3, and the other is located above the condensation chamber 4; the salt layer monitoring device 11 includes a pressure sensor 13 and a plurality of photoelectric switches 14; the pressure sensor 13 is installed on the bottom of the evaporation tank 1 and is located on one side of the salt discharge pipe 8; the photoelectric switches 14 are installed on the side wall of the evaporation tank 1 and are arranged in sequence from the salt discharge pipe 8 upward.

[0043] Combination Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, a guide portion 15 is further provided at the bottom of the evaporation tube. The guide portion 15 is located below the evaporation chamber 3 , and the inner wall of the guide portion 15 is in a funnel shape with a diameter gradually decreasing downward. The salt discharge pipe 8 is provided at the bottom of the guide portion 15 .

[0044] Combination Figure 1 , Figure 3 and Figure 5 As shown, the pressure sensor 13 described in this embodiment is disposed on the side wall of the guide portion 15 .

[0045] Combination Figure 4 and Figure 5As shown, in this embodiment, the heating component 9 includes a heat exchange head 16 connected to one side of the evaporator 1 and a plurality of heat exchange tubes 17 penetrating the evaporation chamber 3 of the evaporator 1. A dividing plate 18 is arranged in the heat exchange head 16, and the dividing plate 18 divides the interior of the heat exchange head 16 into an isolated process chamber 19 and an outlet chamber 20. One end of the heat exchange tube 17 is connected to the process chamber 19, and the other end is connected to the outlet chamber 20. The heat exchange head 16 is also connected to a second water inlet pipe 21 connected to the process chamber 19, and a second water outlet pipe 22 connected to the outlet chamber 20.

[0046] Combination Figure 2 and Figure 3 As shown, in this embodiment, an insertion port 30 is provided on one side of the evaporator 1 connected to the heating component 9 , and the heat exchange tube 17 extends into the evaporator 1 through the insertion port 30 .

[0047] Among them Figure 4 As shown in the figure, the heating assembly 9 in this embodiment preferably includes a tube sheet 23, which is clamped between the heat exchange head 16 and the evaporator 1, and both ends of the heat exchange tube 17 are connected to the tube sheet 23. A plurality of support plates 24 are also provided in the evaporation chamber 3 of the evaporator 1, and the heat exchange tube 17 is passed through the support plates 24.

[0048] Among them Figure 5 As shown in the figure, the evaporation chamber 3 described in this embodiment includes a narrow section 25, a wide section 26 and a transition section 27. The diameter of the wide section 26 is larger than the diameter of the wide section 26. The transition section 27 is connected between the narrow section 25 and the wide section 26. The diameter of the transition section 27 gradually increases from the narrow section 25 to the wide section 26. The narrow section 25 is arranged close to the heating component 9, and the wide section 26 is connected to the condensation chamber 4.

[0049] Combination Figure 3 and Figure 5 As shown, the evaporation tank 1 in this embodiment is further connected to a third water outlet pipe 28 , which is communicated with the evaporation chamber 3 and is located below the narrow section 25 of the evaporation chamber 3 .

[0050] Combination Figures 1 to 3 As shown, in this embodiment, the side of the evaporation tank 1 is also connected with a manhole pipe 29 communicating with the interior thereof.

[0051] The evaporation method of this embodiment is as follows: first, the wastewater to be evaporated is input through the first water inlet pipe 6 and stored in the evaporation chamber 3 of the evaporation tank 1, and then the liquid carrying the residual heat is input from the second water inlet pipe 21 into the process chamber 19 of the heat exchange head 16, and the liquid carrying the residual heat flows from the process chamber 19 to the outlet chamber 20 through the heat exchange pipe 17, and the liquid carrying the residual heat will enter the evaporation chamber 3 of the evaporation tank 1 in the process of passing through the heat exchange pipe 17, and the residual heat in the liquid will be transferred to the stored wastewater, so as to achieve the heating of the wastewater. Heat, and the liquid whose waste heat has been recovered will be discharged from the outlet chamber 20 through the second outlet pipe 22, and when the waste water is heated, it will evaporate and generate steam that rises, and the crystals left by the evaporation will be deposited in the evaporation chamber 3, and then the steam will move to the condensation chamber 4 through the steam gap 5, and condense to form condensed water, which can be stored in the condensation chamber 4 or discharged through the first outlet pipe 7, and the crystals accumulated at the bottom of the evaporation chamber 3 will gradually gather toward the guide part 15 under the action of the waste water flow, and finally be discharged through the salt discharge pipe 8.

[0052] During the evaporation of wastewater, part of the steam will move to the narrow section 25 of the evaporation chamber 3. Since the support plate 24 of the heating component 9 is provided at the narrow section 25, part of the steam will be retained in the narrow section 25 of the evaporation chamber 3 and condensed into condensed water. When the condensed water accumulates to a certain amount, it can be discharged through the third water outlet pipe 28.

[0053] The detection method of this embodiment is as follows: two radar level gauges 12 respectively display the liquid level heights in the evaporation chamber 3 and the condensation chamber 4 in real time; and the accumulation amount of the crystal layer needs to be detected by the photoelectric switch 14 to detect the height of the crystal layer, and then by the pressure sensor 13 to detect the weight of the crystal layer, and the two are combined to determine the accumulation amount of the crystal layer.

[0054] The advantage of this embodiment is that a detection component is provided, and the water level monitoring device and the salt layer monitoring device in the detection component can respectively realize real-time monitoring of the water level and the accumulation amount of the crystal layer in the evaporation tank, so as to facilitate the staff to judge the evaporation situation in the evaporation tank.

[0055] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wastewater evaporator utilizing waste heat, comprising: An evaporator (1) is hollow inside, and a baffle plate (2) is inserted into the evaporator (1), the baffle plate (2) divides the internal cavity of the evaporator (1) into an evaporation cavity (3) and a condensation cavity (4), and a steam gap (5) is provided between the evaporation cavity (3) and the condensation cavity (4); A first water inlet pipe (6), a first water outlet pipe (7) and a salt discharge pipe (8), all of which are connected to the evaporation tank (1), wherein the first water inlet pipe (6) and the salt discharge pipe (8) are both in communication with the evaporation chamber (3), and the first water outlet pipe (7) is in communication with the condensation chamber (4); A heating component (9) connected to one side of the evaporation tank (1) and extending into the evaporation chamber (3); It is characterized by further comprising: A detection component, which at least comprises a water level monitoring device (10) and a salt layer monitoring device (11); The water level monitoring devices (10) include at least two devices, both of which are installed on the evaporation tank (1), and one of the water level monitoring devices (10) is arranged to be aligned with the evaporation chamber (3) to detect the water level height in the evaporation chamber (3); the other water level monitoring device (10) is arranged to be aligned with the condensation chamber (4) to detect the water level height in the condensation chamber (4); The salt layer monitoring device (11) is installed on the evaporation tank (1) and is arranged close to the salt discharge pipe (8) to detect the height of crystal accumulation around the salt discharge pipe (8).

2. A wastewater evaporator utilizing waste heat according to claim 1, characterized in that: The water level monitoring device (10) comprises two radar level gauges (12), both of which are arranged on the top of the evaporation tank (1), one of which is located above the evaporation chamber (3) and the other is located above the condensation chamber (4); the salt layer monitoring device (11) comprises a pressure sensor (13) and a plurality of photoelectric switches (14); the pressure sensor (13) is arranged on the bottom of the evaporation tank (1) and is located on one side of the salt discharge pipe (8); the photoelectric switches (14) are arranged on the side wall of the evaporation tank (1) and are arranged in sequence from the salt discharge pipe (8) upward.

3. A wastewater evaporator utilizing waste heat according to claim 2, characterized in that: The bottom of the evaporation tank is also provided with a guide portion (15), the guide portion (15) is located below the evaporation chamber (3), and the inner wall of the guide portion (15) is in a funnel shape with a diameter gradually decreasing downwards, and the salt discharge pipe (8) is arranged at the bottom of the guide portion (15).

4. A wastewater evaporator utilizing waste heat according to claim 3, characterized in that: The pressure sensor (13) is arranged on the side wall of the guide part (15).

5. The wastewater evaporator utilizing waste heat according to claim 1, characterized in that: The heating component (9) comprises a heat exchange head (16) connected to one side of the evaporator (1) and a plurality of heat exchange tubes (17) passing through the evaporation chamber (3) of the evaporator (1); a dividing plate (18) is arranged inside the heat exchange head (16); the dividing plate (18) divides the interior of the heat exchange head (16) into an isolated process chamber (19) and an outlet chamber (20); one end of the heat exchange tube (17) is connected to the process chamber (19), and the other end is connected to the outlet chamber (20); the heat exchange head (16) is also connected to a second water inlet pipe (21) connected to the process chamber (19), and a second water outlet pipe (22) connected to the outlet chamber (20).

6. A wastewater evaporator utilizing waste heat according to claim 5, characterized in that: The heating component (9) preferably includes a tube sheet (23), the tube sheet (23) being sandwiched between the heat exchange head (16) and the evaporator (1), both ends of the heat exchange tube (17) being connected to the tube sheet (23), and a plurality of support plates (24) being arranged in the evaporation chamber (3) of the evaporator (1), and the heat exchange tube (17) being passed through the support plates (24).

7. The wastewater evaporator utilizing waste heat according to claim 1, characterized in that: The evaporation chamber (3) comprises a narrow section (25), a wide section (26) and a transition section (27); the diameter of the wide section (26) is larger than the diameter of the wide section (26); the transition section (27) is connected between the narrow section (25) and the wide section (26); the diameter of the transition section (27) gradually increases from the narrow section (25) toward the wide section (26); the narrow section (25) is arranged close to the heating component (9); and the wide section (26) is connected to the condensation chamber (4).

8. A wastewater evaporator utilizing waste heat according to claim 7, characterized in that: The evaporation tank (1) is also connected to a third water outlet pipe (28), the third water outlet pipe (28) is in communication with the evaporation chamber (3) and is located below the narrow section (25) of the evaporation chamber (3).

9. The wastewater evaporator utilizing waste heat according to claim 1, characterized in that: The side of the evaporation tank (1) is also connected to a manhole pipe (29) communicating with the interior thereof.

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