Ultra-pure ammonia rectification device

Abstract

The utility model relates to the field of distillation equipment, in particular to an ultra-pure ammonia rectification device which comprises a rectification tower body and a condenser, the top of the side wall of the rectification tower body is communicated with a gas outlet pipeline, one end of the gas outlet pipeline penetrates through the top wall of the rectification tower body, and the other end of the gas outlet pipeline is communicated with the condenser; the heating element is used for heating the side wall of the air outlet pipeline, and a heat preservation layer is arranged on the outer wall of the air outlet pipeline in a surrounding mode. The device has the effect of reducing the possibility that ammonia gas is condensed into ammonia liquid in the gas outlet pipeline and flows back into the rectifying tower.

Description

Technical Field

[0001] The present application relates to the field of distillation equipment, and in particular to an ultrapure ammonia distillation device. Background Art

[0002] High-purity ammonia is an important chemical raw material, widely used in ammonia synthesis, electronics industry and fertilizer production. In the preparation process of high-purity ammonia, a distillation tower is used to continuously distill ammonia water to separate ammonia gas and water. After continuous distillation in the distillation tower, ammonia gas is separated from the solution, and nitrogen gas passes upward through the tower plate or filler, gradually reducing the water content until the required high purity is reached. Finally, the high-purity ammonia gas is led out from the outlet pipe at the top of the tower into the condenser, and the cooling water in the condenser condenses the ammonia gas in the condenser into high-purity ammonia liquid.

[0003] The distillation towers used by large-scale high-purity ammonia manufacturers are relatively large and are usually installed outdoors. The existing gas outlet pipes are metal pipes. Due to the low outdoor temperature in the north in winter, it is easy for the high-temperature nitrogen discharged from the distillation tower to condense into liquid ammonia directly inside the gas outlet pipe. It is easy for the liquid ammonia in the gas outlet pipe to remain in the gas outlet pipe and reflux to the bottom of the distillation tower, affecting the production efficiency of the liquid ammonia. Utility Model Content

[0004] In order to reduce the possibility that ammonia gas is condensed into ammonia liquid in the gas outlet pipeline and refluxes into the distillation tower, the present application provides an ultrapure ammonia distillation device.

[0005] The present application provides an ultrapure ammonia distillation device that adopts the following technical solution:

[0006] An ultrapure ammonia distillation device comprises a distillation tower body and a condenser, wherein the top of the side wall of the distillation tower body is connected to a gas outlet pipe, one end of the gas outlet pipe is passed through the top wall of the distillation tower body, and the other end is connected to the condenser; and further comprises a heating element, wherein the heating element is used to heat the side wall of the gas outlet pipe, and an insulation layer is arranged around the outer wall of the gas outlet pipe.

[0007] By adopting the above technical scheme, ammonia enters the gas outlet pipe from the inside of the distillation tower body, and is transported to the condenser through the gas outlet pipe to be condensed into liquid ammonia; the insulation layer can isolate the external cold air outside the insulation layer, thereby reducing the influence of the external cold air on the ammonia in the gas outlet pipe, thereby reducing the possibility that the ammonia in the gas outlet pipe will condense into liquid ammonia in the pipe due to the low temperature caused by the external temperature; when the external temperature is too low, the heating element can heat up the side wall of the gas outlet pipe, thereby reducing the possibility that the ammonia in the gas outlet pipe will condense into liquid ammonia due to the low temperature and flow back into the distillation tower.

[0008] Optionally, the heating element includes a heating tube and a heating box, the heating tube is arranged between the outer wall of the air outlet pipe and the inner wall of the heating tube; the heating tube is arranged around the outer wall of the air outlet pipe, the interior of the heating tube is filled with a fluid medium, both ends of the heating tube in the extension direction are connected to the interior of the heating box, and a heater is arranged in the heating box, and the heater is used to heat the fluid medium.

[0009] By adopting the above technical solution, the heater can heat the fluid medium to increase the temperature of the fluid medium; the fluid medium flows between the heating tube and the heating box, and the heat in the fluid medium can be transferred to the inside of the outlet pipe through the heating tube and the outlet pipe, so that the inside of the outlet pipe can be at a higher temperature, reducing the impact of the low temperature of the external environment on the state of ammonia inside the outlet pipe.

[0010] Optionally, a plurality of temperature sensors are provided inside the air outlet pipe, and the temperature sensors are embedded in the inner wall of the air outlet pipe, and the signal output ends of the temperature sensors are communicatively connected with the signal input ends of the heater.

[0011] By adopting the above technical solution, the temperature sensor can monitor the temperature inside the outlet pipe. When it is detected that the temperature inside the outlet pipe is lower than a preset threshold, the heater is controlled to turn on, so that the heater automatically heats the fluid medium when the temperature inside the outlet pipe becomes low, so that the temperature inside the outlet pipe is always maintained at an appropriate state.

[0012] Optionally, a side of the thermal insulation layer away from the air outlet pipe is covered with a protective layer.

[0013] By adopting the above technical solution, the protective layer can protect the thermal insulation layer, thereby reducing the possibility of the thermal insulation layer being damaged by the external environment for a long time and extending the service life of the thermal insulation layer.

[0014] Optionally, a feeding pipe is provided on the side wall of the distillation tower body, one end of the feeding pipe is connected to the interior of the distillation tower body, and the other end is connected to a raw material box; the middle section of the feeding pipe is connected to a feed pump.

[0015] By adopting the above technical solution, ammonia production raw materials are stored in the raw material box. Under the action of the feed pump, the raw materials can continuously flow from the feeding pipe into the distillation tower body to supplement the production raw materials of the distillation tower body and improve the production efficiency of ammonia liquid.

[0016] Optionally, a discharge pipe is provided on the bottom wall of the distillation tower body, one end of the discharge pipe is connected to the interior of the distillation tower body, and the other end is penetrated through the inner wall of the raw material box, and the discharge pipe is connected to the interior of the raw material box.

[0017] By adopting the above technical solution, the solution that has not been completely evaporated in the distillation tower body can flow out of the distillation tower body through the discharge pipe and then return to the raw material box for utilization, thereby achieving the effect of saving resources.

[0018] Optionally, a packing layer is provided inside the distillation tower body, and the packing layer is fixedly connected to the inner wall of the distillation tower body; the packing layer includes a plurality of irregularly placed guide plates, and a plurality of fluid channels are formed between the guide plates.

[0019] By adopting the above technical solution, ammonia gas is separated from ammonia water after distillation in the main body of the distillation tower, and the ammonia gas passes through the packing layer during its upward movement; when passing through multiple fluid channels, the moisture carried by the ammonia gas can adhere to the side walls of the fluid channels, so that the moisture carried by the ammonia gas is gradually reduced, thereby improving the purity of the ammonia liquid after treatment.

[0020] Optionally, one end of the gas outlet pipe close to the distillation tower body is covered with a water absorption layer, and the water absorption layer is filled with activated carbon desiccant.

[0021] By adopting the above technical solution, when ammonia passes through the water absorption layer when entering the gas outlet pipe from the distillation tower body, the activated carbon desiccant can further remove the moisture carried by the ammonia, thereby further improving the purity of the ammonia liquid.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] The insulation layer can isolate the external cold air outside the insulation layer, thereby reducing the impact of the external cold air on the outlet pipe and the ammonia in the outlet pipe, and further reducing the possibility that the ammonia in the outlet pipe will condense into liquid ammonia in the pipe due to the low external temperature; when the external temperature is too low, the heating element can heat up the side wall of the outlet pipe, thereby reducing the possibility that the ammonia in the outlet pipe will condense into liquid ammonia due to the low temperature and flow back into the distillation tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the ultrapure ammonia distillation device in this embodiment;

[0025] Figure 2 It is a partial cross-sectional view of the main body of the distillation tower of the present application;

[0026] Figure 3 It is a partial cross-sectional view of the insulation layer and the protective layer of the outlet pipe of the present application;

[0027] Figure 4 This is the control schematic diagram of the temperature sensor.

[0028] Figure numerals: 1. distillation tower body; 11. feeding pipe; 12. raw material box; 13. feed pump; 14. discharge pipe; 15. packing layer; 151. guide plate; 152. fluid channel; 16. water absorption layer; 2. condenser; 3. air outlet pipe; 4. heating element; 41. heating tube; 42. heating box; 43. heater; 44. temperature sensor; 5. insulation layer; 6. protective layer. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses an ultrapure ammonia distillation device.

[0031] Reference Figure 1 An ultrapure ammonia distillation device includes a distillation tower body 1 and a condenser 2. The top of the side wall of the distillation tower body 1 is connected with an outlet pipe 3. One end of the outlet pipe 3 is penetrated through the top wall of the distillation tower body 1, and the other end is connected with the condenser 2. When in use, ammonia gas enters the outlet pipe 3 from the inside of the distillation tower body 1, and is transported to the condenser 2 through the outlet pipe 3 to condense into liquid ammonia. The device also includes a heating element 4. When the external temperature is low, the heating element 4 can heat up the side wall of the outlet pipe 3, thereby reducing the possibility that the ammonia gas is condensed into liquid ammonia and refluxed into the distillation tower due to the low temperature in the outlet pipe 3.

[0032] Reference Figure 1 A feeding pipe 11 is connected to the middle section of the side wall in the height direction of the distillation tower body 1, one end of the feeding pipe 11 is connected to the interior of the distillation tower body 1, and the other end is provided with a raw material box 12 storing ammonia production raw materials; one end of the feeding pipe 11 away from the distillation tower body 1 is penetrated by the raw material box 12, and the feeding pipe 11 is connected to the interior of the raw material box 12; the middle section of the feeding pipe 11 is connected to a feed pump 13, under the action of the feed pump 13, the raw materials can continuously flow from the feeding pipe 11 into the interior of the distillation tower body 1 to supplement the production raw materials of the distillation tower body 1.

[0033] Reference Figure 1 A discharge pipe 14 is arranged on the bottom wall of the distillation tower body 1, one end of the discharge pipe 14 is connected to the interior of the distillation tower body 1, and the other end is penetrated through the inner wall of the raw material box 12, and the discharge pipe 14 is connected to the interior of the raw material box 12; the middle section of the discharge pipe 14 is connected to a waste treatment device, and the solution that has not been completely evaporated in the distillation tower body 1 can flow out of the distillation tower body 1 through the discharge pipe 14, and after a series of treatments by the waste treatment device, it can return to the raw material box 12 for utilization, thereby achieving the effect of saving resources.

[0034] Reference Figure 2A packing layer 15 is arranged inside the distillation tower body 1, the length direction of the packing layer 15 is consistent with the height direction of the distillation tower body 1, and the packing layer 15 is fixedly connected to the inner wall of the distillation tower body 1; the packing layer 15 includes a plurality of irregularly placed guide plates 151, and a plurality of fluid channels 152 are formed between the plurality of guide plates 151, and the extension directions of the plurality of fluid channels 152 are different; ammonia gas is separated from ammonia water after continuous distillation, and the ammonia gas moves upward from the bottom of the distillation tower body 1; the ammonia gas passes through a plurality of fluid channels 152 during the rising process, and the moisture carried in the ammonia gas adheres to the side walls of the fluid channels 152, so that the moisture carried by the ammonia gas is gradually reduced, thereby improving the purity of the ammonia liquid.

[0035] In this embodiment, the packing layer 15 is made of chlorinated polyvinyl chloride resin, which has strong heat resistance and corrosion resistance and a high thermal deformation temperature. When in contact with a high-temperature heat medium for a long time, it can still maintain good mechanical properties, thereby extending the service life of the packing layer 15.

[0036] Reference Figure 2 One end of the outlet pipe 3 close to the distillation tower body 1 is covered with a water absorption layer 16, and the inside of the water absorption layer 16 is filled with activated carbon desiccant; when the ammonia gas enters the outlet pipe 3 from the distillation tower body 1, it passes through the water absorption layer 16, and the activated carbon desiccant can further remove the moisture carried by the ammonia gas, thereby further improving the purity of the ammonia liquid.

[0037] Reference Figure 3 and Figure 4 In this embodiment, the heating element 4 includes a heating tube 41 and a heating box 42. The heating tube 41 is arranged around the outer wall of the air outlet pipe 3. The interior of the heating tube 41 is filled with a fluid medium. Both ends of the heating tube 41 in the extension direction are penetrated through the side walls of the heating box 42, and the interior of the heating tube 41 is connected to the interior of the heating box 42. A heater 43 is arranged in the heating box 42, and the heater 43 is fixed on the side wall in the height direction of the heating box 43; when the fluid medium in the heating tube 41 should release a large amount of heat and cool down, the heater 43 can heat the fluid medium to increase the temperature of the fluid medium, so that the fluid medium inside the heating tube 41 can maintain a higher temperature.

[0038] Reference Figure 3 and Figure 4A plurality of temperature sensors 44 are arranged inside the air outlet pipe 3, and the temperature sensors 44 are embedded in the inner wall of the air outlet pipe 3. The signal output end of the temperature sensor 44 is communicatively connected with the signal input end of the heater 43; the temperature sensor 44 can monitor the temperature inside the air outlet pipe 3, and when it is detected that the temperature inside the air outlet pipe 3 is lower than a preset threshold value, an opening instruction is sent to the heater 43; after receiving the opening instruction, the heater 43 automatically heats the fluid medium, which can not only keep the temperature inside the air outlet pipe 3 at a suitable state at all times, but also improve the convenience of the staff in controlling the opening and closing of the heater 43, thereby improving work efficiency.

[0039] Reference Figure 3 The outer wall of the air outlet pipe 3 is surrounded by an insulation layer 5, and the heating pipe 41 is arranged between the inner wall of the insulation layer 5 and the outer wall of the air outlet pipe 3. In this embodiment, the insulation layer 5 is made of polyurethane material; the insulation layer 5 can isolate the cold air from the outside outside the insulation layer 5, thereby reducing the influence of the cold air from the outside on the ammonia in the air outlet pipe 3, and further reducing the possibility that the ammonia in the air outlet pipe 3 is condensed into liquid ammonia in the pipe due to the low temperature due to the low external temperature; in addition, the insulation layer 5 can isolate the heat of the heating pipe 41 between the insulation layer 5 and the outer wall of the air outlet pipe 3, thereby reducing the possibility that the heat generated by the heating element 4 escapes to the outside, thereby achieving the effect of saving energy.

[0040] Reference Figure 3 The side of the thermal insulation layer 5 away from the air outlet pipe 3 is covered with a protective layer 6, and the protective layer 6 covers the outer wall of the thermal insulation layer 5. The protective layer 6 of this embodiment is made of PVC material. The protective layer 6 of PVC material has high mechanical strength and stable chemical properties. It can protect the thermal insulation layer 5, thereby reducing the possibility of the thermal insulation layer 5 being damaged by the external environment for a long time and extending the service life of the thermal insulation layer 5.

[0041] The implementation principle of the ultrapure ammonia distillation device of the embodiment of the present application is as follows: the ammonia water raw material enters the distillation tower body 1 from the feeding pipe 11, and ammonia gas is separated through continuous distillation. The separated ammonia gas is introduced into the condenser 2 through the outlet pipe 3 to form ammonia liquid; the insulation layer 5 can isolate the external cold air outside the insulation layer 5, thereby reducing the possibility of the external cold air affecting the ammonia gas in the outlet pipe 3;

[0042] The temperature sensor 44 can monitor the temperature inside the outlet pipe 3. When it is detected that the temperature inside the outlet pipe 3 is lower than a preset threshold, an opening instruction is sent to the heater 43. After receiving the opening instruction, the heater 43 automatically heats the fluid medium so that the outlet pipe 3 can maintain a suitable temperature, thereby reducing the possibility that the ammonia gas in the outlet pipe 3 will condense into ammonia liquid in the pipe due to the low temperature caused by the external temperature being too low.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An ultrapure ammonia distillation device, characterized in that: The invention comprises a distillation tower body (1) and a condenser (2), wherein a gas outlet pipe (3) is arranged at the top of the side wall of the distillation tower body (1), one end of the gas outlet pipe (3) is passed through the top wall of the distillation tower body (1), and the other end is arranged in communication with the condenser (2); and the invention also comprises a heating element (4), wherein the heating element (4) is used to heat the side wall of the gas outlet pipe (3), and a heat-insulating layer (5) is arranged around the outer wall of the gas outlet pipe (3).

2. The ultrapure ammonia distillation device according to claim 1, characterized in that: The heating element (4) comprises a heating tube (41) and a heating box (42); the heating tube (41) is arranged between the outer wall of the air outlet pipe (3) and the inner wall of the heating tube (41); the heating tube (41) is arranged around the outer wall of the air outlet pipe (3); the interior of the heating tube (41) is filled with a fluid medium; both ends of the heating tube (41) in the extension direction are connected to the interior of the heating box (42); a heater (43) is arranged in the heating box (42); the heater (43) is used to heat the fluid medium.

3. The ultrapure ammonia distillation device according to claim 2, characterized in that: A plurality of temperature sensors (44) are arranged inside the air outlet pipe (3); the temperature sensors (44) are embedded in the inner wall of the air outlet pipe (3); and the signal output end of the temperature sensor (44) is communicatively connected to the signal input end of the heater (43).

4. The ultrapure ammonia distillation device according to claim 1, characterized in that: The side of the thermal insulation layer (5) away from the air outlet pipe (3) is covered with a protective layer (6).

5. The ultrapure ammonia distillation device according to claim 1, characterized in that: A feeding pipe (11) is arranged on the side wall of the distillation tower body (1), one end of the feeding pipe (11) is connected to the interior of the distillation tower body (1), and the other end is connected to a raw material box (12); the middle section of the feeding pipe (11) is connected to a feed pump (13).

6. The ultrapure ammonia distillation device according to claim 5, characterized in that: A discharge pipe (14) is arranged on the bottom wall of the distillation tower body (1), one end of the discharge pipe (14) is connected to the interior of the distillation tower body (1), and the other end is passed through the inner wall of the raw material box (12), and the discharge pipe (14) is connected to the interior of the raw material box (12).

7. The ultrapure ammonia distillation device according to claim 1, characterized in that: A packing layer (15) is arranged inside the distillation tower body (1), and the packing layer (15) is fixedly connected to the inner wall of the distillation tower body (1); the packing layer (15) comprises a plurality of irregularly placed guide plates (151), and a plurality of fluid channels (152) are formed between the plurality of guide plates (151).

8. The ultrapure ammonia distillation device according to claim 1, characterized in that: One end of the gas outlet pipe (3) close to the distillation tower body (1) is covered with a water absorption layer (16), and the inside of the water absorption layer (16) is filled with activated carbon desiccant.

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