Ammonia distillation device for vaporizing wastewater into steam through microwave heating

Abstract

The invention 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 invention relates to the technical field of ammonia evaporation equipment, in particular to an ammonia evaporation device for vaporizing 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 has the characteristics of 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, the existing ammonia distillation process and equipment have at least the following defects and deficiencies: the direct steam ammonia distillation process uses steam to directly pass from the bottom of the ammonia distillation tower, and after condensation, it is discharged together with the waste water in the tower. The ammonia distillation process not only fails to reduce wastewater emissions, but increases about 20% of ammonia distillation wastewater, 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 heavy environmental pollution. The thermal oil method ammonia distillation process uses an indirect heating ammonia distillation reboiler to supply heat to the ammonia distillation tower, and the reboiler is heated by thermal oil; the thermal oil is heated by coal gas in the thermal oil furnace, and is pumped to the reboiler by the hot oil pump to circulate and heat the waste water in the tower of the ammonia distillation tower. The hot oil after releasing heat is returned to the thermal oil furnace for heating and then recycled; the thermal oil method ammonia distillation process has high investment, and the thermal oil heating furnace produces waste gas. In the tubular furnace ammonia distillation process, the wastewater from the tower bottom is sent to the tubular furnace for heating through a circulating pump, and the resulting vapor-liquid mixture is returned to the tower for flash evaporation to generate steam as the heat source for the ammonia distillation tower; the tubular furnace ammonia distillation process has high investment, and the ammonia distillation tubular furnace heating furnace produces waste gas. The steam reboiler ammonia distillation process uses steam to indirectly heat the ammonia distillation reboiler to supply heat to the ammonia distillation tower, reducing the direct steam ammonia distillation wastewater; the steam reboiler ammonia distillation process has high investment, and the steam temperature is unstable, which affects the ammonia distillation operation. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides an ammonia evaporation 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 object, 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 divider; 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 and located at 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 divider is fixedly connected to the top of the tower body.

[0007] Furthermore, the tower body comprises a cylinder body, 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 of the connecting pipe is connected to the bottom of the tower body. 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 plate.

[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 tray, a vertical sieve plate or an inclined hole tray.

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

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

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. After the wastewater at the bottom of the tower is separated by sedimentation, it flows into the evaporation space along the liquid flow port, and is heated by a microwave heating device to vaporize the wastewater into steam. The steam enters the tower plate upward along the middle circular hole of the upper cone section to be used for ammonia distillation in the ammonia distillation tower. The liquid outside the upper cone section returns to the evaporation space along the liquid discharge port to continue vaporization, and the tar and other impurities at the bottom of the evaporation space are discharged to the outside of the tower along the vent port. The present invention vaporizes the wastewater by heating with a microwave heating device to provide steam for the ammonia distillation tower, which has high efficiency, low energy consumption, low cost, and little environmental pollution.

[0017] 2. The microwave generator of the present invention adopts a power-adjustable microwave generator, and the power of the microwave generator 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 steaming and ensuring the ammonia steaming effect.

[0018] 3. The present invention adopts the method of wastewater evaporation to provide steam for the ammonia distillation tower, which is stable and reliable.

[0019] 4. The present invention uses 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

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] In the figure: 1-skirt 2-lower head 3-manhole 4-connecting pipe 5-liquid seal plate 6-cylinder 7-tower plate 8-raw ammonia water inlet 9-upper cone section 10-liquid discharge port 11-liquid flow port 12-lower cone section 13-first venting port 14-second venting port 15-microwave heating device 16-contractor 17-ammonia outlet 31-control cabinet 32-microwave generator 33-microwave waveguide 34-temperature sensor DETAILED DESCRIPTION

[0022] 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 combination 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 by no means 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 creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​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 technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0028] like Figure 1 As shown, an ammonia evaporation 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.

[0029] 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.

[0030] The lower cone section 12, the upper cone section 9, the liquid seal plate 5, and the tower plate 7 are fixedly connected in the cylinder 6 from bottom to top. The lower cone section 12, the upper cone section 9 and the side wall of the cylinder 6 constitute an evaporation space, a liquid flow port 11 is provided at the upper part of the lower cone section 12, and a first venting port 13 is provided at the bottom of the lower cone section 12. A circular through hole is provided at the center of the top of the upper cone section 9, and a liquid discharge port 10 is provided at the bottom of the upper cone section 9.

[0031] After sedimentation and separation, the waste water 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 waste water. The steam enters the tower plate 7 upward along the middle circular hole of the upper cone section 9 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 discharge port 10 to continue vaporization, and the tar and other impurities at the bottom of the evaporation space are discharged to the outside of the tower along the first vent port 13.

[0032] The connecting pipe 4 is fixedly connected 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. Wastewater containing tar impurities is separated at the bottom of the tower body, and tar and other impurities are discharged from the second vent 14.

[0033] The raw ammonia water inlet 8 is fixed to the side wall of the cylinder and is located at the tower tray 7.

[0034] The microwave heating device 5 is installed outside the tower body, located in the evaporation space. The microwave heating device 15 includes 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 side wall of the cylinder 6 in the evaporation space. The temperature sensor 34 is placed inside the cylinder 6. The control cabinet 31 is electrically connected to the microwave generator 32, the microwave waveguide 33 and the temperature sensor 34. The microwave generator 32 adopts a power-adjustable microwave generator, and the power of the microwave generator 32 is adjusted according to the steam temperature measured by the temperature sensor 34.

[0035] The tray 7 is a bubble tray, a vertical sieve plate or an inclined hole tray.

[0036] The decompressor 16 is a fixed tube sheet heat exchanger. The ammonia gas in the tower passes upward through the decompressor, and part of the condensate flows back into the tower. An ammonia gas outlet 17 is provided at the top of the decompressor 16.

[0037] The process principle and working process of the present invention are as follows:

[0038] The raw ammonia water sent from the tank area enters the upper part of the tower through the raw ammonia water inlet 8 after preheating and adding alkali. 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 by the ammonia decompressor 16 at the top of the tower to obtain product ammonia gas for use in downstream processes. The condensate produced by the ammonia decompressor 16 is used as reflux liquid and flows directly back into the tower.

[0039] After ammonia evaporation, 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, and the tar and other impurities are discharged from the second vent 14. The microwave heating device 15 uses microwave heating, the microwave generator 32 is a power adjustable microwave generator, and the temperature sensor 34 is placed inside the cylinder 6. The power of the microwave generator is adjusted according to the steam outlet temperature measured by the temperature sensor 34.

[0040] After sedimentation and separation, the waste water 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 waste water. The steam goes upward into the tower plate 7 along the middle circular hole of the upper cone section 9 to be used for ammonia distillation in the ammonia distillation tower, and contacts with the raw ammonia water in reverse from the bottom of the tower plate to complete the ammonia distillation process. The liquid outside the upper cone section 9 returns to the evaporation space along the discharge port 10 to continue vaporization, and the tar and other impurities at the bottom of the evaporation space are discharged to the outside of the tower along the first venting port 13.

[0041] The present invention heats the wastewater by a microwave heating device 15 to vaporize the wastewater and provide steam for the ammonia evaporation tower, which has high efficiency, low energy consumption, low cost and little environmental pollution. The microwave generator 32 of the present invention adopts a power-adjustable microwave generator, and the microwave generator power is adjusted according to the steam temperature measured by the temperature sensor 34. The temperature of the heated steam is stable, which is conducive to improving the efficiency of ammonia evaporation and ensuring the ammonia evaporation effect. The present invention adopts the method of evaporating wastewater to provide steam for the ammonia evaporation tower, which is stable and reliable. The present invention adopts a connecting pipe 4 to introduce wastewater into the bottom of the tower, separate impurities such as tar, and reduce equipment blockage.

[0042] The above descriptions are only some 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 can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and they 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 divider; The lower cone section, the upper cone section, the liquid sealing 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, and the steam enters the tower plate along the through hole. The divider 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 body, a lower head and a skirt seat which are sequentially connected from top to bottom, and a second vent is arranged 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, the top of which is connected to the liquid seal plate, and the bottom of which is connected to the bottom of the tower body. Wastewater containing tar impurities is separated at the bottom of the tower body, and the impurities are discharged from the second vent.

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 comprises 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. 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 port. The liquid outside the upper cone section returns to the evaporation space along the liquid discharge port to continue vaporization, and the impurities at the bottom of the evaporation space are discharged outside the tower along the first vent port.

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 tray, a vertical sieve plate or an inclined hole tray.

8. The ammonia distillation device for vaporizing wastewater into steam by microwave heating according to claim 1, characterized in that: The decompressor is a fixed tube sheet heat exchanger. The ammonia gas in the tower passes upward through the ammonia decompressor, 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 arranged on the top of the fractionator.

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