A nitric acid tail gas recovery device for producing strontium nitrate
By designing a purification tower and a circulating heating system in the strontium nitrate production process, the problem of heat loss from nitric acid tail gas was solved, enabling the recovery and utilization of tail gas heat and improving the value of tail gas recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI GEZHI NEW MATERIALS CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-19
AI Technical Summary
In the existing technology, the heat of nitric acid tail gas is lost during the spray purification process in the production of strontium nitrate, resulting in heat waste and ineffective utilization, which reduces the value of tail gas recovery.
A device comprising a purification tower, an inlet pipe, a heat exchange hood, a heat-conducting pipe, an insulation tank, a water supply pipe, an opening and closing pipe, a bend, and a sinking pipe was designed. The heat of the nitric acid tail gas is recovered by circulating and heating water in the insulation tank and exchanging heat through the heat-conducting pipe. The heat exchange effect is improved by increasing the residence time of the tail gas through a friction-enhancing plate.
This approach enables the effective utilization of heat from nitric acid tail gas, increases the value of tail gas recovery, reduces heat loss, and enhances purification efficiency.
Smart Images
Figure CN224371053U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas recovery technology, and in particular to a nitric acid tail gas recovery device for the production of strontium nitrate. Background Technology
[0002] During the production of strontium nitrate, a portion of nitric acid tail gas is generated. Currently, in chemical production processes, nitric acid tail gas is often directly emitted into the atmosphere.
[0003] In the prior art, Chinese Patent Publication No. CN203170208U discloses a device for recovering nitric acid tail gas from the production of strontium nitrate. It includes an absorption tower, a storage tank, and a reflux pump. An inlet pipe and a outlet pipe are provided at the bottom of the absorption tower, and a reflux pipe is provided at the top of the absorption tower. The reflux pump is located on the reflux pipe, and the outlet pipe and the reflux pipe are connected to the storage tank. Utilizing this invention to recover nitric acid tail gas from the production of strontium nitrate not only protects the environment but also avoids resource waste.
[0004] However, in actual use, the nitric acid tail gas produced by strontium nitrate production carries a certain amount of heat. Directly purifying the gas by spraying it results in heat loss during the spraying process, leading to heat waste and making it inconvenient to utilize the heat of the tail gas. Therefore, improvements are needed. Utility Model Content
[0005] The purpose of this invention is to provide a nitric acid tail gas recovery device for the production of strontium nitrate, which facilitates the utilization of the heat of the nitric acid tail gas and increases the recovery value of the nitric acid tail gas.
[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a nitric acid tail gas recovery device for producing strontium nitrate, comprising a purification tower, an inlet pipe fixedly connected to the bottom of the purification tower, a heat exchange hood fixedly connected to the outer surface of the inlet pipe, a heat conduction pipe fixedly connected to the inner wall of the heat exchange hood, a heat insulation tank provided on one side of the purification tower, a water supply pipe fixedly connected to the top of the heat insulation tank, an opening and closing pipe fixedly connected to the bottom of the heat insulation tank, a bent pipe inserted into the inner wall of the opening and closing pipe, a sinking pipe fixedly connected to one end of the bent pipe, and the top of the sinking pipe extending into the interior of the heat exchange hood.
[0007] By adopting the above technical solution, when nitric acid tail gas is generated during the production of strontium nitrate, the nitric acid tail gas is introduced into the inlet pipe, and then enters the purification tower for spray purification treatment. Before the nitric acid tail gas is introduced, room temperature clean water is added inside the insulation tank. The water is transported by the water supply pipe and enters the interior of the heat exchange hood. When the heated nitric acid tail gas passes through the area surrounded by the heat exchange hood, it exchanges heat with the water inside the heat exchange hood through the heat conduction of the heat pipe. After being heated, the water flows out from the sink pipe and then into the bend pipe. The sink pipe and the bend pipe are all insulated pipes. Due to the continuous water supply from the water supply pipe, the water inside the sink pipe is pressurized and flows back to the insulation tank through the bend pipe into the opening and closing pipe. The water in the insulation tank circulates. The heated water flows back to the bottom layer, and the water with a lower temperature at the top layer is drawn out for heating. Through repeated circulation, the water inside the insulation tank is heated into hot water, which facilitates the utilization of the heat of the nitric acid tail gas and increases the recovery value of the nitric acid tail gas.
[0008] A further feature of this invention is that a drag-increasing plate is fixedly connected to the inner wall of the air intake pipe, and the number of the drag-increasing plates is several.
[0009] By adopting the above technical solution, when the exhaust gas flows, it comes into contact with the drag-increasing plate, increasing the resistance and thus increasing the residence time of the exhaust gas.
[0010] A further feature of this invention is that several of the aforementioned resistance-enhancing sheets are arranged in an alternating vertical distribution, with the distance between each pair of the resistance-enhancing sheets being equal.
[0011] By adopting the above technical solution, the exhaust gas flow rate is slowed down after being restricted by the drag-increasing plate, thereby increasing the heat exchange effect.
[0012] A further feature of this invention is that a sealing sleeve is fixedly connected to the top of the heat exchange cover, and the inner wall of the sealing sleeve is inserted into the water supply pipe.
[0013] By adopting the above technical solution, the sealing sleeve can be separated from the water supply pipe, which facilitates the removal of the insulated tank.
[0014] A further feature of this invention is that an insulation cover is threadedly connected to the top of the insulation tank, and a water pump is fixedly connected to the inner wall of the insulation tank.
[0015] By adopting the above technical solution, the insulation cover can be opened and closed, and the water pump is started during heat exchange.
[0016] A further feature of this invention is that a suction pipe is fixedly connected to one end of the water pump, and a liquid level sensor is fixedly connected to the bottom of the suction pipe.
[0017] By adopting the above technical solution, the water level sensor can be continuously submerged during circulating heating, which is beneficial for the suction pipe to draw water from the upper layer.
[0018] A further feature of this invention is that the output end of the water pump is fixedly connected to the water delivery pipe, and a valve is provided on the outer surface of the opening and closing pipe.
[0019] By adopting the above technical solution, the valve facilitates the opening and closing of the valve tube. When the heating is finished and the valve is closed, the bend can be separated from the valve tube.
[0020] A further feature of this invention is that an exhaust pipe is fixedly connected to the top of the purification tower, and a support is fixedly connected to the bottom of the insulation tank.
[0021] By adopting the above technical solution, the purified exhaust gas is discharged from the exhaust pipe, and the support is raised to a certain height.
[0022] A further feature of this invention is that the interior of the insulated container is fixedly connected with insulating cotton, and the insulating cotton consists of two layers.
[0023] By adopting the above technical solution, the insulation cotton has a strong heat preservation effect, preventing the loss of heat from the heated water.
[0024] A further feature of this invention is that the inner wall of the insulated container is coated with an anti-rust coating, and the inner wall of the anti-rust coating is coated with a waterproof layer.
[0025] By adopting the above technical solutions, the anti-rust coating and waterproof layer increase internal protection and prevent water erosion.
[0026] The beneficial effects of this utility model are:
[0027] 1. This utility model, through the coordinated arrangement of the purification tower, inlet pipe, heat exchange hood, heat conduction pipe, insulation tank, water supply pipe, opening and closing pipe, bend pipe, and sink pipe, enables the device to, during use, when nitric acid tail gas is generated during the production of strontium nitrate, introduce the nitric acid tail gas into the inlet pipe, allowing it to enter the purification tower for spray purification treatment. Before the nitric acid tail gas is introduced, room temperature clean water is added to the insulation tank, and the water is transported by the water supply pipe into the interior of the heat exchange hood. When the heated nitric acid tail gas passes through the area surrounded by the heat exchange hood, it is purified by spraying. Through heat conduction by the heat pipe, heat is exchanged with the water inside the heat exchange hood. The heated water flows out from the sink pipe and then into the bend pipe. Both the sink pipe and the bend pipe are insulated pipes. Due to the continuous water supply, the water inside the sink pipe is pressurized and flows back to the insulated tank through the bend pipe into the opening and closing pipe. The water in the insulated tank circulates. The heated water flows back to the bottom layer, and the cooler water at the top layer is drawn out for heating. Through repeated circulation, the water inside the insulated tank is heated into hot water, which facilitates the utilization of the heat of nitric acid tail gas and increases the recovery value of nitric acid tail gas.
[0028] 2. This utility model, through the coordinated arrangement of the resistance-increasing plate, sealing sleeve, heat preservation cover, water pump, suction pipe, liquid level sensor, valve, exhaust pipe, bracket, heat preservation cotton, anti-rust coating, and waterproof layer, enables the device to achieve the following: when the exhaust gas flows, it contacts the resistance-increasing plate, increasing resistance and thus prolonging the residence time of the exhaust gas. After the exhaust gas is restricted by the resistance-increasing plate, the flow rate is slowed down, increasing the heat exchange effect. The sealing sleeve can be separated from the water supply pipe, facilitating the removal of the heat preservation tank. The water level can always submerge the liquid level sensor during circulating heating, facilitating the suction pipe to draw water from the upper layer. The heat preservation cotton has a strong heat preservation effect, preventing heat loss after heating. The anti-rust coating and waterproof layer increase internal protection, preventing water corrosion. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the structure of this utility model;
[0031] Figure 2 This is a schematic diagram of the heat exchange shroud structure of this utility model;
[0032] Figure 3 This is a schematic diagram of the water suction pipe structure of this utility model;
[0033] Figure 4 This is a schematic diagram of the thermal insulation cotton structure of this utility model.
[0034] In the diagram, 1. Purification tower; 2. Air inlet pipe; 3. Heat exchange hood; 4. Heat conduction pipe; 5. Insulation tank; 6. Water supply pipe; 7. Opening and closing pipe; 8. Bend; 9. Submerged pipe; 10. Resistance increasing plate; 11. Sealing sleeve; 12. Insulation cover; 13. Water pump; 14. Suction pipe; 15. Liquid level sensor; 16. Valve; 17. Exhaust pipe; 18. Support; 19. Insulation cotton; 20. Rust-proof coating; 21. Waterproof layer. Detailed Implementation
[0035] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0036] A nitric acid tail gas recovery device for the production of strontium nitrate includes the following embodiments:
[0037] Example 1:
[0038] Reference Figure 1-4 A nitric acid tail gas recovery device for producing strontium nitrate includes a purification tower 1. An inlet pipe 2 is fixedly connected to the bottom of the purification tower 1. A heat exchange hood 3 is fixedly connected to the outer surface of the inlet pipe 2. A heat conduction pipe 4 is fixedly connected to the inner wall of the heat exchange hood 3. A heat preservation tank 5 is provided on one side of the purification tower 1. A water supply pipe 6 is fixedly connected to the top of the heat preservation tank 5. An opening and closing pipe 7 is fixedly connected to the bottom of the heat preservation tank 5. A bend pipe 8 is inserted into the inner wall of the opening and closing pipe 7. A sinking pipe 9 is fixedly connected to one end of the bend pipe 8. The top of the sinking pipe 9 extends into the interior of the heat exchange hood 3.
[0039] Specifically, when nitric acid tail gas is generated during the production of strontium nitrate, the tail gas is introduced into the inlet pipe 2, and then enters the purification tower 1 for spray purification treatment. Before the tail gas is introduced, room temperature clean water is added to the insulation tank 5, and the water is transported by the water supply pipe 6, thus entering the interior of the heat exchange hood 3. When the heated tail gas passes through the area surrounded by the heat exchange hood 3, it exchanges heat with the water inside the heat exchange hood 3 through heat conduction by the heat conduction pipe 4. The water is then heated and flows out... The water flows out through the sinking pipe 9 and then into the bend pipe 8. Both the sinking pipe 9 and the bend pipe 8 are insulated pipes. Due to the continuous water supply from the water supply pipe 6, the water inside the sinking pipe 9 is pressurized and flows back into the insulated tank 5 through the bend pipe 8 and the opening and closing pipe 7. The water inside the insulated tank 5 is circulated. The heated water flows back to the bottom layer, and the water with a lower temperature at the top layer is drawn out for heating. Through repeated circulation, the water inside the insulated tank 5 is heated into hot water, which facilitates the utilization of the heat of the nitric acid tail gas and increases the recovery value of the nitric acid tail gas.
[0040] Example 2:
[0041] Reference Figure 1-4 The inner wall of the air inlet pipe 2 is fixedly connected with several resistance-increasing plates 10, which are arranged in an alternating pattern with equal spacing between each pair. A sealing sleeve 11 is fixedly connected to the top of the heat exchange hood 3, and the inner wall of the sealing sleeve 11 is inserted into the water supply pipe 6. An insulation cover 12 is threadedly connected to the top of the insulation tank 5. A water pump 13 is fixedly connected to the inner wall of the insulation tank 5, and a suction pipe 14 is fixedly connected to one end of the water pump 13. A liquid level sensor 15 is fixedly connected to the bottom of the water pipe 14, the output end of the water pump 13 is fixedly connected to the water supply pipe 6, a valve 16 is provided on the outside of the opening and closing pipe 7, an exhaust pipe 17 is fixedly connected to the top of the purification tower 1, a bracket 18 is fixedly connected to the bottom of the heat preservation tank 5, and heat preservation cotton 19 is fixedly connected inside the heat preservation tank 5. The heat preservation cotton 19 has two layers, and the inner wall of the heat preservation tank 5 is coated with an anti-rust coating 20. The inner wall of the anti-rust coating 20 is coated with a waterproof layer 21.
[0042] Specifically, when the exhaust gas flows, it comes into contact with the resistance plate 10, increasing the resistance and thus increasing the residence time of the exhaust gas. After the exhaust gas is restricted by the resistance plate 10, the flow rate slows down, increasing the heat exchange effect. The sealing sleeve 11 can be separated from the water pipe 6, which facilitates the removal of the heat preservation tank 5. The heat preservation cover 12 can be opened and closed. The water pump 13 is started during heat exchange. The water level can always submerge the liquid level sensor 15 during circulating heating, which facilitates the suction pipe 14 to draw the upper layer of water. The valve 16 facilitates the opening and closing of the opening and closing pipe 7. When heating is finished, the valve 16 is closed. The bend 8 can be separated from the opening and closing pipe 7. The purified exhaust gas is discharged from the exhaust pipe 17. The height of the support 18 is raised. The heat preservation cotton 19 has a strong heat preservation effect to prevent the heat loss of the heated water. The anti-rust coating 20 and the waterproof layer 21 increase internal protection to prevent water corrosion.
[0043] In this invention, when nitric acid tail gas is generated during the production of strontium nitrate, the nitric acid tail gas is introduced into the inlet pipe 2, and then enters the purification tower 1 for spray purification treatment. Before the nitric acid tail gas is introduced, room temperature clean water is added inside the insulation tank 5. The water is transported by the water supply pipe 6 and enters the interior of the heat exchange hood 3. When the heated nitric acid tail gas passes through the area surrounded by the heat exchange hood 3, it exchanges heat with the water inside the heat exchange hood 3 under the heat conduction of the heat conduction pipe 4. After being heated, the water flows out from the sink pipe 9 and then into the bend pipe 8. The sink pipe 9 and the bend pipe 8 are both insulated pipes. Due to the continuous water supply from the water supply pipe 6, the water inside the sink pipe 9 is pressurized and flows back to the insulation tank 5 through the bend pipe 8 and the opening and closing pipe 7. The water in the insulation tank 5 circulates, the heated water flows back to the bottom layer, and the water with a lower temperature at the top layer is drawn out for heating. This repeated circulation keeps the water inside the insulation tank 5 heated. Heated into hot water, the heat from the nitric acid tail gas is utilized, increasing its recovery value. The device utilizes a combination of components: a resistance plate 10, a sealing sleeve 11, an insulation cover 12, a water pump 13, a suction pipe 14, a level sensor 15, a valve 16, an exhaust pipe 17, a support 18, insulation cotton 19, an anti-rust coating 20, and a waterproof layer 21. This design ensures that when the tail gas flows, it contacts the resistance plate 10, increasing resistance and extending the tail gas's residence time. The resistance plate 10 restricts the flow rate, improving heat exchange. The sealing sleeve 11 can be separated from the water pipe 6, facilitating the removal of the insulation tank 5. During circulating heating, the water level consistently submerges the level sensor 15, allowing the suction pipe 14 to draw water from the upper layer. The insulation cotton 19 provides strong insulation, preventing heat loss after heating. The anti-rust coating 20 and waterproof layer 21 enhance internal protection, preventing water corrosion.
[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A nitric acid tail gas recovery device for the production of strontium nitrate, comprising a purification tower (1), characterized in that: An air inlet pipe (2) is fixedly connected to the bottom of the purification tower (1). A heat exchange cover (3) is fixedly connected to the outer surface of the air inlet pipe (2). A heat conduction pipe (4) is fixedly connected to the inner wall of the heat exchange cover (3). A heat preservation tank (5) is provided on one side of the purification tower (1). A water supply pipe (6) is fixedly connected to the top of the heat preservation tank (5). An opening and closing pipe (7) is fixedly connected to the bottom of the heat preservation tank (5). A bend pipe (8) is inserted into the inner wall of the opening and closing pipe (7). A sinking pipe (9) is fixedly connected to one end of the bend pipe (8). The top of the sinking pipe (9) extends into the interior of the heat exchange cover (3).
2. The nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: The inner wall of the air intake pipe (2) is fixedly connected with a drag-increasing plate (10), and the number of drag-increasing plates (10) is several.
3. The nitric acid tail gas recovery device for producing strontium nitrate according to claim 2, characterized in that: Several resistance-enhancing plates (10) are arranged in an alternating pattern, with the distance between each pair of resistance-enhancing plates (10) being the same.
4. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: A sealing sleeve (11) is fixedly connected to the top of the heat exchange cover (3), and the inner wall of the sealing sleeve (11) is inserted into the water supply pipe (6).
5. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: The top of the heat preservation tank (5) is threaded with a heat preservation cover (12), and a water pump (13) is fixedly connected to the inner wall of the heat preservation tank (5).
6. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 5, characterized in that: One end of the water pump (13) is fixedly connected to a suction pipe (14), and a liquid level sensor (15) is fixedly connected to the bottom of the suction pipe (14).
7. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 5, characterized in that: The output end of the water pump (13) is fixedly connected to the water delivery pipe (6), and the outer surface of the opening and closing pipe (7) is provided with a valve (16).
8. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: An exhaust pipe (17) is fixedly connected to the top of the purification tower (1), and a bracket (18) is fixedly connected to the bottom of the heat preservation tank (5).
9. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: The heat preservation container (5) is fixedly connected to the inside with heat preservation cotton (19), and the heat preservation cotton (19) consists of two layers.
10. A nitric acid tail gas recovery device for producing strontium nitrate according to claim 1, characterized in that: The inner wall of the insulated tank (5) is coated with an anti-rust coating (20), and the inner wall of the anti-rust coating (20) is coated with a waterproof layer (21).