Ammonia distillation device for vaporizing wastewater into steam through microwave heating

Abstract

The utility model relates to the technical field of ammonia distillation equipment, in particular to an ammonia distillation device for vaporizing wastewater into steam through microwave heating. Comprising a tower body, a microwave heating device, an upper conical section, a lower conical section, a liquid sealing disc, a tower disc and a dephlegmator, the lower conical section, the upper conical section, the liquid sealing disc and the tower disc are fixedly connected in the tower body from bottom to top; the lower conical section, the upper conical section and the tower body form an evaporation space, the lower conical section is provided with a liquid circulation opening, and the upper conical section is provided with a through hole; the microwave heating device is installed outside the tower body and located at the evaporation space, wastewater enters the evaporation space through the liquid circulation opening and is heated by the microwave heating device to be vaporized into steam, and the steam enters the tower tray along the through hole; and the dephlegmator is fixedly connected to the top of the tower body. The method is high in efficiency, low in energy consumption, low in cost, small in pollution, stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia distillation equipment, in particular to an ammonia distillation device which vaporizes waste water into steam through microwave heating. Background Art

[0002] At present, ammonia evaporation mainly adopts direct steam ammonia evaporation process, thermal oil ammonia evaporation process, tubular furnace ammonia evaporation process and steam reboiler ammonia evaporation process. Coking wastewater is characterized by high ammonia phenol content and poor biodegradability. It is a difficult and hot spot in the field of industrial wastewater. Its treatment usually requires flotation oil removal, solvent dephenolization, wastewater ammonia evaporation, biochemical treatment and other steps before it can meet the discharge standards. The steps before biochemical treatment are collectively referred to as pretreatment. Biochemical treatment is more sensitive to the ammonia nitrogen content and phenol content after pretreatment. The only process in pretreatment that controls the ammonia nitrogen index is the ammonia evaporation process, so ammonia evaporation is a key step in wastewater treatment.

[0003] However, existing ammonia distillation processes and equipment have at least the following drawbacks and deficiencies: Direct steam ammonia distillation uses steam introduced directly from the bottom of the ammonia distillation tower, where it is condensed and discharged along with the tower bottom wastewater. This process not only fails to reduce wastewater emissions but actually increases ammonia distillation wastewater by approximately 20%, resulting in low energy efficiency and a heavier burden on subsequent biochemical treatment. Direct steam ammonia distillation also has low tower efficiency, high energy consumption, high costs, and severe environmental pollution. Thermal oil ammonia distillation uses an indirect heating ammonia distillation reboiler to supply heat to the ammonia distillation tower. The reboiler is heated with thermal oil. The thermal oil is heated by coal gas in a thermal oil boiler and pumped to the reboiler to circulate and heat the tower bottom wastewater. The released heat is then returned to the thermal oil boiler for reheating and recycling. Thermal oil ammonia distillation requires high investment, and the thermal oil heater generates waste gas. In the tubular furnace ammonia distillation process, the tower bottom wastewater is pumped to the tubular furnace for heating. The resulting vapor-liquid mixture is then returned to the tower for flash evaporation to generate steam, which serves as the heat source for the ammonia distillation tower. This process requires high investment, and the tubular furnace heater produces exhaust gas. The steam reboiler process uses steam to indirectly heat the ammonia distillation reboiler to supply heat to the ammonia distillation tower, reducing the amount of wastewater generated by direct steam distillation. However, this process requires high investment, and the steam temperature is unstable, which affects the ammonia distillation operation. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides an ammonia distillation device which vaporizes wastewater into steam by microwave heating, which has high efficiency, low energy consumption, low cost, low pollution, and is stable and reliable.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An ammonia evaporation device for vaporizing wastewater into steam by microwave heating comprises a tower body, a microwave heating device, an upper cone section, a lower cone section, a liquid sealing plate, a tower plate and a distributor; the lower cone section, the upper cone section, the liquid sealing plate and the tower plate are fixedly connected to the tower body from bottom to top; the lower cone section, the upper cone section and the tower body constitute an evaporation space, the lower cone section is provided with a liquid flow port, and the upper cone section is provided with a through hole; the microwave heating device is installed outside the tower body, located in the evaporation space, wastewater enters the evaporation space through the liquid flow port, is heated by the microwave heating device to vaporize the wastewater into steam, and the steam enters the tower plate along the through hole; the distributor is fixedly connected to the top of the tower body.

[0007] Furthermore, the tower body includes a cylinder, a lower head and a skirt seat which are sequentially connected from top to bottom, and a second vent is provided at the bottom of the lower head.

[0008] Furthermore, it also includes a connecting pipe, which is fixed to the cylinder, the top of the connecting pipe is connected to the liquid seal disk, and the bottom end is connected to the bottom of the tower body. The wastewater containing tar impurities is separated at the bottom of the tower body, and the impurities are discharged from the second vent.

[0009] Furthermore, it also includes a raw ammonia water inlet, which is fixed to the side wall of the cylinder and located at the tower tray.

[0010] Furthermore, the microwave heating device includes a control cabinet, a microwave generator, a microwave waveguide and a temperature sensor; the microwave waveguide is fixed to the outer wall of the tower body, and the temperature sensor is placed inside the tower body; the control cabinet is electrically connected to the microwave generator, the microwave waveguide and the temperature sensor, and the microwave generator adopts a power-adjustable microwave generator, and the microwave generator power is adjusted according to the steam temperature measured by the temperature sensor.

[0011] Furthermore, the upper cone section is provided with a drain port, and the lower cone section is provided with a first vent port. The liquid outside the upper cone section returns to the evaporation space along the drain port to continue vaporization, and the impurities at the bottom of the evaporation space are discharged outside the tower along the first vent port.

[0012] Furthermore, the tower tray is a bubble cap tower tray, a vertical sieve plate or an inclined hole tower tray.

[0013] Furthermore, the decompressor is a fixed tube sheet heat exchanger, and the ammonia gas in the tower passes upward through the ammonia decompressor, and part of the condensate refluxes into the tower.

[0014] Furthermore, an ammonia outlet is provided on the top of the fractionator.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. After sedimentation and separation at the bottom of the tower, the wastewater in this utility model flows through the liquid flow port into the evaporation space. It is then heated by a microwave heating device, vaporizing the wastewater into steam. The steam then flows upward through the circular hole in the center of the upper conical section into the tower tray, where it is used to distill ammonia in the ammonia distillation tower. Liquid outside the upper conical section returns to the evaporation space through the drain port for continued vaporization. Tar and other impurities at the bottom of the evaporation space are discharged out of the tower through the vent port. This utility model uses microwave heating to vaporize wastewater and provide steam for the ammonia distillation tower. This method of providing steam for the ammonia distillation tower by evaporating wastewater is stable, reliable, efficient, low-energy-consumption, low-cost, and minimally polluting the environment.

[0017] 2. The microwave generator of this utility model adopts a power-adjustable microwave generator. The microwave generator power is adjusted according to the steam temperature measured by the temperature sensor. The heating steam temperature is stable, which is conducive to improving the efficiency of ammonia distillation and ensuring the ammonia distillation effect.

[0018] 3. The utility model adopts a connecting pipe to introduce wastewater into the bottom of the tower to separate impurities such as tar and reduce equipment blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the utility model.

[0020] In the figure: 1- skirt 2- lower head 3- manhole 4- connecting pipe 5- liquid seal plate 6- cylinder 7- tray 8- raw ammonia inlet 9- upper cone section 10- drain port 11- liquid flow port 12- lower cone section 13- first vent 14- second vent 15- microwave heating device 16- fractionator 17- ammonia outlet 31- control cabinet 32- microwave generator 33- microwave waveguide 34- temperature sensor DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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 a limitation on the present invention.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0024] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0026] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0027] like Figure 1 As shown, an ammonia distillation device for vaporizing wastewater into steam by microwave heating includes a tower body, a microwave heating device 15, an upper cone section 9, a lower cone section 12, a connecting pipe 4, a liquid sealing plate 5, a tower plate 7, a raw ammonia water inlet 8 and a fractionator 16.

[0028] The tower body is composed of a cylinder 6, a lower head 2 and a skirt 1 which are connected in sequence from top to bottom. A second vent 14 is provided at the bottom of the lower head 2, and a manhole 3 is provided on the side wall of the cylinder 6.

[0029] The lower conical section 12, upper conical section 9, liquid seal plate 5, and tower tray 7 are fixedly attached to the cylinder 6 from bottom to top. The lower conical section 12, upper conical section 9, and the sidewall of the cylinder 6 form the evaporation space. A liquid flow port 11 is provided at the top of the lower conical section 12, and a first vent 13 is provided at the bottom of the lower conical section 12. A circular through-hole is provided at the center of the top of the upper conical section 9, and a liquid drain port 10 is provided at the bottom of the upper conical section 9.

[0030] After sedimentation and separation, the wastewater at the bottom of the tower flows into the evaporation space along the liquid flow port 11, and is heated by the microwave heating device 15 to vaporize the wastewater. The steam flows upward along the middle circular hole of the upper cone section 9 into the tower tray 7 to be used for ammonia distillation in the ammonia distillation tower. The liquid outside the upper cone section 9 returns to the evaporation space along the drain port 10 to continue vaporization. Tar and other impurities at the bottom of the evaporation space are discharged outside the tower along the first vent port 13.

[0031] The connecting pipe 4 is fixed to the side wall of the cylinder 6. The top of the connecting pipe 4 is connected to the bottom liquid seal disk 5, and the bottom is connected to the bottom of the tower body. The wastewater containing tar impurities is separated at the bottom of the tower body, and the tar and other impurities are discharged from the second vent 14.

[0032] The raw ammonia water inlet 8 is fixed to the side wall of the cylinder and is located at the tower tray 7.

[0033] The microwave heating device 5 is installed outside the tower, within the evaporation space. The microwave heating device 15 comprises a control cabinet 31, a microwave generator 32, a microwave waveguide 33, and a temperature sensor 34. The microwave waveguide 33 is fixed to the sidewall of the cylinder 6 in the evaporation space. The temperature sensor 34 is located within the cylinder 6. The control cabinet 31 is electrically connected to the microwave generator 32, microwave waveguide 33, and temperature sensor 34. The microwave generator 32 is a power-adjustable microwave generator, whose power is adjusted based on the steam temperature measured by the temperature sensor 34.

[0034] The tray 7 is a bubble cap tray, a vertical sieve plate or an inclined hole tray.

[0035] The ammonia gas in the tower passes upward through the ammonia decompressor 16, and part of the condensate flows back into the tower. An ammonia gas outlet 17 is provided at the top of the decompressor 16.

[0036] The process principle and working process of this utility model are as follows:

[0037] The raw ammonia water sent from the tank area is preheated and alkali-added before entering the upper part of the tower through the raw ammonia water inlet 8. The steam at the bottom of the tower is used as a heat source to evaporate the free ammonia in the ammonia water. The evaporated ammonia gas is condensed in the ammonia fractionator 16 at the top of the tower to obtain product ammonia gas for use in downstream processes. The condensate produced by the ammonia fractionator 16 is used as reflux liquid and flows directly back into the tower.

[0038] After ammonia distillation, wastewater flows from the bottom liquid seal plate 5 through the connecting pipe 4 into the bottom of the tower. Wastewater containing tar impurities is separated at the bottom of the tower, and tar and other impurities are discharged through the second vent 14. Microwave heating device 15 uses microwave heating. Microwave generator 32 is a power-adjustable microwave generator, and temperature sensor 34 is placed inside cylinder 6. The microwave generator power is adjusted according to the steam outlet temperature measured by temperature sensor 34.

[0039] After sedimentation and separation, the wastewater at the bottom of the tower flows into the evaporation space along the liquid flow port 11. It is heated by the microwave heating device 15 to vaporize the wastewater. The steam flows upward through the central circular hole of the upper conical section 9 into the tower tray 7 to be used for ammonia distillation in the ammonia distillation tower. From the bottom of the tower tray, it moves upward in reverse contact with the raw ammonia water to complete the ammonia distillation process. The liquid outside the upper conical section 9 returns to the evaporation space along the drain port 10 to continue vaporization. Tar and other impurities at the bottom of the evaporation space are discharged to the outside of the tower through the first vent port 13.

[0040] This utility model utilizes microwave heating device 15 to vaporize wastewater and provide steam for the ammonia still. This method boasts high efficiency, low energy consumption, low cost, and minimal environmental impact. The microwave generator 32 in this utility model utilizes an adjustable power microwave generator, adjusting its power based on the steam temperature measured by temperature sensor 34. The stable temperature of the heated steam improves ammonia still efficiency and ensures ammonia still performance. This utility model utilizes wastewater evaporation to provide steam for the ammonia still, providing a stable and reliable method. A connecting pipe 4 is used to direct wastewater to the bottom of the tower, separating impurities such as tar and reducing equipment clogging.

[0041] The above description is only part of the specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and the utility model concept of the present invention, should be covered by the protection scope of the present invention.

Claims

1. An ammonia distillation device for vaporizing wastewater into steam by microwave heating, characterized in that: It includes a tower body, a microwave heating device, an upper cone section, a lower cone section, a liquid sealing plate, a tower plate and a splitter; The lower cone section, the upper cone section, the liquid seal plate and the tower plate are fixedly connected in the tower body from bottom to top; The lower cone section, the upper cone section and the tower body constitute an evaporation space, the lower cone section is provided with a liquid flow port, and the upper cone section is provided with a through hole; The microwave heating device is installed outside the tower body, located in the evaporation space. Wastewater enters the evaporation space through the liquid flow port and is heated by the microwave heating device to vaporize the wastewater into steam. The steam enters the tower tray along the through hole. The splitter is fixedly connected to the top of the tower body.

2. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The tower body comprises a cylinder, a lower head and a skirt seat which are sequentially connected from top to bottom, and a second vent is provided at the bottom of the lower head.

3. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 2, characterized in that: It also includes a connecting pipe, which is fixed to the cylinder, with the top end of the connecting pipe connected to the liquid sealing disk and the bottom end of the connecting pipe connected to the bottom of the tower body.

4. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 2, characterized in that: It also includes a raw ammonia water inlet, which is fixed to the side wall of the cylinder and located at the tower plate.

5. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The microwave heating device includes a control cabinet, a microwave generator, a microwave waveguide and a temperature sensor; The microwave waveguide is fixed to the outer wall of the tower body, and the temperature sensor is placed inside the tower body; the control cabinet is electrically connected to the microwave generator, microwave waveguide, and temperature sensor. The microwave generator adopts a power-adjustable microwave generator, and the microwave generator power is adjusted according to the steam temperature measured by the temperature sensor.

6. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The upper cone section is provided with a liquid discharge port, and the lower cone section is provided with a first vent.

7. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The tower tray is a bubble cap tower tray, a vertical sieve plate or an inclined hole tower tray.

8. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The demultiplexer is a fixed tube sheet heat exchanger. The ammonia gas in the tower passes upward through the ammonia demultiplexer, and part of the condensate flows back into the tower.

9. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: An ammonia outlet is provided on the top of the fractionator.

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