Microwave indirect heating ammonia still

Abstract

The utility model relates to the technical field of ammonia distillation equipment, in particular to a microwave indirect heating ammonia distillation tower. Comprising a tower body, a wastewater atomization device, a microwave heating device, a liquid sealing disc, a tower disc and a dephlegmator, an atomizing nozzle of the wastewater atomizing device is mounted in the tower body and located at the middle lower part, and the atomizing nozzle downwards sprays atomized wastewater; the microwave heating device is installed outside the tower body and located below the wastewater atomization device, and atomized wastewater is flashed and vaporized through microwave heating of the microwave heating device; the liquid seal disc and the tower disc are mounted in the tower body, the liquid seal disc is positioned above the wastewater atomization device, and the tower disc is positioned above the liquid seal disc; and the dephlegmator is fixedly connected to the top of the tower body. The method has the advantages of high efficiency, low energy consumption, low cost and small environmental pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia distillation equipment, in particular to a microwave indirect heating ammonia distillation tower. Background Art

[0002] Coking wastewater, characterized by high ammonia-phenol content and poor biodegradability, is both a challenging and hot topic in the industrial wastewater treatment sector. Its treatment typically requires flotation oil removal, solvent dephenolization, ammonia distillation, and biochemical treatment before it meets discharge standards. The steps preceding biochemical treatment are collectively referred to as pretreatment, and biochemical treatment is highly sensitive to the ammonia nitrogen and phenol content after pretreatment. Ammonia distillation is the only process in pretreatment that controls ammonia nitrogen levels, making it a critical step in wastewater treatment.

[0003] Conventional ammonia distillation processes mainly include direct steam ammonia distillation process, thermal oil ammonia distillation process, tubular furnace ammonia distillation process and steam reboiler ammonia distillation process.

[0004] In the direct steam ammonia distillation process, steam is introduced directly from the bottom of the ammonia distillation tower, and after condensation, it is discharged together with the wastewater from the tower bottom. The ammonia distillation process not only fails to reduce wastewater emissions, but increases the amount of ammonia distillation wastewater by about 20%. It has low energy efficiency and increases the burden of subsequent biochemical treatment. The direct steam ammonia distillation process has low tower efficiency, high energy consumption, high cost, and serious environmental pollution.

[0005] The thermal oil ammonia distillation process uses an indirect heating ammonia distillation reboiler to supply heat to the distillation column. The reboiler is heated with thermal oil. The thermal oil is heated by gas in a thermal oil boiler and pumped to the reboiler to circulate and heat the wastewater in the distillation column kettle. The released heat is then returned to the thermal oil boiler for reheating and recycling. However, the disadvantages are high investment and the generation of waste gas from the thermal oil heater.

[0006] In the tubular furnace ammonia distillation process, wastewater from the tower bottom is pumped through a circulating pump to a tubular furnace for heating. The resulting vapor-liquid mixture then returns to the tower for flash evaporation, generating steam that serves as the heat source for the ammonia distillation column. However, the disadvantages are high investment costs and the generation of waste gas from the tubular furnace heating system.

[0007] The steam reboiler ammonia distillation process uses steam to indirectly heat the ammonia distillation reboiler to supply heat to the ammonia distillation column, reducing the wastewater generated by direct steam distillation. However, its disadvantages include high investment and unstable steam temperature, which affects the distillation operation. Utility Model Content

[0008] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a microwave indirect heating ammonia distillation tower, which has high efficiency, low energy consumption, low cost and little pollution to the environment.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A microwave indirect heating ammonia distillation tower comprises a tower body, a wastewater atomization device, a microwave heating device, a liquid sealing disk, a tower tray and a fractionator; the atomizing nozzle of the wastewater atomization device is installed in the tower body, located in the lower middle part, and the atomizing nozzle sprays atomized wastewater downward; the microwave heating device is installed outside the tower body, located below the wastewater atomization device, and the atomized wastewater is flash vaporized by microwave heating of the microwave heating device; the liquid sealing disk and the tower tray are installed in the tower body, the liquid sealing disk is located above the wastewater atomization device, and the tower tray is located above the liquid sealing disk; the fractionator is fixed to the top of the tower body.

[0011] Furthermore, the tower body includes a cylinder, a lower head and a skirt which are sequentially connected from top to bottom.

[0012] Furthermore, it also includes a conical section, a vertical pipe, a first vent, a second vent and a partition; the conical section is fixed in the cylinder, located below the wastewater atomization device, and the vertical pipe is fixed to the bottom of the conical section; the partition is vertically fixed in the lower head; the first vent and the second vent are fixed to the bottom of the lower head, located on both sides of the partition.

[0013] Furthermore, it also includes a raw ammonia water inlet and an ammonia gas outlet; the raw ammonia water inlet is fixedly connected to the tower wall of the tower body, located at the tower plate; the ammonia gas outlet is fixedly connected to the top of the fractionator.

[0014] Furthermore, it also includes a connecting pipe, which is fixed to the tower wall of the tower body, the top of the connecting pipe is connected to the liquid sealing disk, and the bottom end is connected to the bottom of the tower body.

[0015] 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 cylinder; 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.

[0016] Furthermore, the wastewater atomization device includes an anti-vortex baffle, a wastewater outlet pipe, a wastewater pump, a connecting pipe, a wastewater inlet pipe, a spray pipe and an atomizing nozzle; the anti-vortex baffle is fixed in the tower body and is located at the bottom, the wastewater outlet pipe is fixed to the tower wall of the tower body at the anti-vortex baffle, the wastewater inlet pipe is fixed to the tower wall in the middle and lower part of the tower body, the wastewater outlet pipe and the wastewater inlet pipe are connected through a connecting pipe, and the wastewater pump is installed on the connecting pipe; the spray pipe is installed in the tower body, the spray pipe is connected to the wastewater inlet pipe, and multiple atomizing nozzles are installed on the spray pipe.

[0017] Furthermore, the tower tray is a bubble cap tower tray, a vertical sieve plate or an inclined hole tower tray.

[0018] Furthermore, the splitter is a fixed tube sheet heat exchanger.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The atomizing nozzle of the wastewater atomizing device of this utility model sprays atomized wastewater downward, and the atomized wastewater is flash-evaporated by microwave heating of the microwave heating device. The use of wastewater atomization flash evaporation to provide steam for the ammonia still is highly efficient, has low energy consumption, low cost, and minimal environmental pollution.

[0021] 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.

[0022] 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

[0023] Figure 1 This is a schematic structural diagram of the utility model.

[0024] In the figure: 1-skirt 2-lower head 3-manhole 4-connecting pipe 5-liquid seal plate 6-cylinder 7-tower tray 8-raw ammonia inlet 9-spraying pipe 10-atomizing nozzle 11-conical section 12-vertical pipe 13-partition 14-partition manhole 15-first vent 16-second vent 17-anti-vortex baffle 18-wastewater outlet pipe 19-wastewater pump 20-connecting pipe 21-wastewater inlet pipe 22-microwave heating device 23 splitter 24-ammonia outlet 31-control cabinet 32-microwave generator 33-microwave waveguide 34-temperature sensor DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0029] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] Unless otherwise specifically stated, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples provided herein are only meant to be illustrative and are not limiting of the scope of the present utility model. Additionally, it is to be understood that the drawings are not necessarily to scale. Techniques, methods, and devices known to those of ordinary skill in the art can not be discussed in detail herein. However, the examples set forth herein are the most complete and specific examples known to the inventors. Any discussion of techniques, methods, and devices known to the art that might have been used in connection with the examples discussed herein can be found in U.S. patent literature files and other sources. It is to be understood that all examples set forth herein are exemplary and not limiting of the scope of the present utility model. Thus, other examples of the present utility model are possible and can be derived from the disclosure of the present utility model by utilizing the principles set forth in the description. Additionally, the scope of the present utility model should not be limited to examples set forth herein, but should be given the broadest possible interpretation accessible under the statutes.

[0031] 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.

[0032] like Figure 1 As shown, a microwave indirect heating ammonia distillation tower includes a tower body, a wastewater atomization device, a microwave heating device 22, a liquid sealing plate 5, a tower plate 7 and a fractionator 23.

[0033] The tower body is a vertical structure, including a cylinder 6, a lower head 2 and a skirt 1. The lower head 2 is fixed to the bottom of the cylinder 6, the splitter 23 is fixed to the top of the cylinder 6, and the lower head 2 is fixed to the skirt 1. It also includes a cone section 11, a vertical pipe 12, a first vent 15, a second vent 16, a partition 13, a raw ammonia water inlet 8, an ammonia gas outlet 24 and a connecting pipe 4. The cone section 11 is fixed to the cylinder 6, located below the microwave heating device 22, and the vertical pipe 12 is fixed to the bottom of the cone section 11. The partition 13 is vertically fixed to the lower head 2, and the first vent 15 and the second vent 16 are fixed to the bottom of the lower head 2, located on the left and right sides of the partition 13. The raw ammonia water inlet 8 is fixed to the side wall of the cylinder 6, located at the tower tray 7, and the ammonia gas outlet 24 is fixed to the top of the splitter 23. The partition 13 is provided with a partition manhole 14.

[0034] The wastewater atomization device includes an anti-vortex baffle 17, a wastewater outlet pipe 18, a wastewater pump 19, a connecting pipe 20, a wastewater inlet pipe 21, a spray pipe 9, and an atomizing nozzle 10. The anti-vortex baffle 17 is fixed to the bottom of the tower body. The wastewater outlet pipe 18 is fixed to the side wall of the cylinder body 6 at the anti-vortex baffle 17. The wastewater inlet pipe 21 is fixed to the side wall of the cylinder body 6 in the lower middle part of the tower body. The wastewater outlet pipe 18 and the wastewater inlet pipe 21 are connected by a connecting pipe 20, and the wastewater pump 19 is mounted on the connecting pipe 20. The spray pipe 9 is installed horizontally within the cylinder body 6 and connected to the wastewater inlet pipe 21. Multiple atomizing nozzles 10 are installed on the spray pipe 9 and are evenly arranged within the cylinder body 6.

[0035] The microwave heating device 22 includes a control cabinet 31, a microwave generator 32, a microwave waveguide 33, and a temperature sensor 24. The microwave waveguide 33 is fixed to the side wall of the cylinder 6 between the wastewater atomization device and the cone section 11. The temperature sensor 24 is placed inside the cylinder 6. The control cabinet 31 is electrically connected to the microwave generator 32, microwave waveguide 33, and temperature sensor 24. The microwave generator 32 uses an adjustable power mode, and its power is adjusted based on the steam temperature measured by the temperature sensor 24.

[0036] The spray pipe 9, the atomizing nozzle 10 and the lower cylinder 6 form a wastewater atomization space, and the external microwave heating device 22 forms an atomization flash evaporation space, and the atomized wastewater is flash vaporized by microwave heating.

[0037] Connecting pipe 4 is fixed to the side wall of cylinder 6. Its top and bottom are connected to liquid seal plate 5, and its bottom is connected to the bottom of cylinder 6. Wastewater containing tar impurities is separated at the bottom of cylinder 6, flows through partition 13 to the right side of partition 13, and is pumped out by wastewater pump 19 through anti-vortex baffle 17. After entering the wastewater heating device for heating, it enters the cylinder for atomization and flash evaporation. Tar and other impurities are discharged through first vent 15 and vent 16.

[0038] The tray 7 is a bubble tray, a vertical sieve tray or an inclined hole tray. The reducer 23 is a fixed tube sheet heat exchanger.

[0039] The working principle and working process of the utility model specifically include the following steps:

[0040] 1. 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 decondenser 23 at the top of the tower to obtain product ammonia gas, which is used in downstream processes. The condensate produced by the ammonia decondenser 23 is used as reflux liquid and flows directly back into the tower.

[0041] 2. After ammonia distillation, the wastewater flows into the bottom of the tower body through the connecting pipe 4 at the bottom liquid seal plate 5. The wastewater containing tar impurities is separated at the bottom of the tower body, flows through the partition 13 to the right side of the partition 13, and is pumped out by the wastewater pump 19 through the anti-vortex baffle 17 and enters the wastewater atomization device. Tar and other impurities are discharged through the first vent 15 and the second vent 16.

[0042] 3. Microwave heating device 22 utilizes 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 based on the steam outlet temperature measured by temperature sensor 34. After microwave heating, the wastewater is atomized through atomizing nozzle 10, forming an atomization flash evaporation space within the cylinder. Within this flash evaporation space, the pressurized wastewater is depressurized and atomized. Microwave heating flash evaporation generates steam, which is then fed into the ammonia distillation tower. This steam flows upward from the bottom of the tower tray into countercurrent contact with the raw ammonia solution, completing the ammonia distillation process. A portion of the atomized liquid flows downward by gravity into conical section 11, then into vertical pipe 12, flowing into the tower bottom. Together with the wastewater at the bottom of the tower, it flows to the right side of partition 13, continuing the atomization flash evaporation process.

[0043] The utility model has high efficiency, low energy consumption, low cost and little pollution to the environment.

[0044] 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. A microwave indirect heating ammonia distillation tower, characterized in that: It includes a tower body, a wastewater atomizing device, a microwave heating device, a liquid sealing plate, a tower plate and a splitter; The atomizing nozzle of the wastewater atomizing device is installed in the tower body, located in the middle and lower part, and the atomizing nozzle sprays atomized wastewater downward; The microwave heating device is installed outside the tower body and is located below the wastewater atomization device. The atomized wastewater is flash vaporized by microwave heating of the microwave heating device. The liquid sealing plate and the tower plate are installed in the tower body, the liquid sealing plate is located above the wastewater atomization device, and the tower plate is located above the liquid sealing plate; The splitter is fixedly connected to the top of the tower body.

2. The microwave indirect heating ammonia distillation tower according to claim 1, characterized in that: The tower body comprises a cylinder, a lower head and a skirt which are sequentially connected from top to bottom.

3. The microwave indirect heating ammonia distillation tower according to claim 2, characterized in that: It also includes a cone section, a vertical pipe, a first vent, a second vent and a partition; The cone section is fixedly connected to the cylinder body and is located below the wastewater atomization device, and the vertical pipe is fixedly connected to the bottom of the cone section; The partition is vertically fixed in the lower head; The first vent and the second vent are fixed to the bottom of the lower head and are located on both sides of the partition.

4. The microwave indirect heating ammonia distillation tower according to claim 1, characterized in that: It also includes a raw ammonia water inlet and an ammonia gas outlet; The raw ammonia water inlet is fixedly connected to the tower wall of the tower body and is located at the tower tray; The ammonia outlet is fixedly connected to the top of the fractionator.

5. The microwave indirect heating ammonia distillation tower according to claim 1, characterized in that: The tower also includes a connecting pipe, which is fixed to the tower wall of the tower body. The top of the connecting pipe is connected to the liquid sealing disk, and the bottom of the connecting pipe is connected to the bottom of the tower body.

6. The microwave indirect heating ammonia distillation tower 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 cylinder; 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.

7. The microwave indirect heating ammonia distillation tower according to claim 1, characterized in that: The wastewater atomization device includes an anti-vortex baffle, a wastewater outlet pipe, a wastewater pump, a connecting pipe, a wastewater inlet pipe, a spray pipe and an atomizing nozzle; The anti-vortex baffle is fixedly connected to the tower body at the bottom, the wastewater outlet pipe is fixedly connected to the tower wall of the tower body at the anti-vortex baffle, the wastewater inlet pipe is fixedly connected to the tower wall at the middle and lower part of the tower body, the wastewater outlet pipe and the wastewater inlet pipe are connected by a connecting pipe, and the wastewater pump is installed on the connecting pipe; The spray pipe is installed in the tower body, the spray pipe is connected to the wastewater inlet pipe, and a plurality of atomizing nozzles are installed on the spray pipe.

8. The microwave indirect heating ammonia distillation tower 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.

9. The microwave indirect heating ammonia distillation tower according to claim 1, characterized in that: The reducer is a fixed tube sheet heat exchanger.

Images