High-pressure oil injection system of ammonification reaction kettle

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a high-pressure oil injection system of an ammonification reaction kettle. Comprising an oil injector, an oil outlet of the oil injector is connected with an oil gun through a pipeline, and an oil gun connector is arranged at the outlet end of the oil gun and can be in sealed connection with a stop valve of an oil injection port assembly through a thread structure; the oil injection port assembly comprises a pipe plug on the outer side, a stop valve in the middle and a check valve on the inner side, the pipe plug and the stop valve are in sealed connection through a thread structure, and the stop valve and the check valve are in sealed connection through a thread structure; the other end of the check valve is in sealed connection with an external oil injection guide pipe through a threaded structure, and the external oil injection guide pipe penetrates through a flange of the ammoniation reaction kettle stirrer, is welded along the outer wall of the stirring supporting frame in a bottom attaching mode and extends to a bearing chamber. According to the device, the anti-reflux reliability is remarkably improved, and the risk of reverse channeling of high-pressure hydrogen / ammonia gas is effectively isolated; and the device can adapt to the high-pressure working condition of 14 MPa or above, oil can be supplemented without shutdown and pressure relief, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a high-pressure oil injection system for an ammoniation reactor. Background Art

[0002] As the core equipment for ammoniation reaction, the stirring system of the ammoniation reactor needs to continuously operate in a high-temperature, high-pressure, flammable and explosive hydrogen environment, with extremely high requirements for safety and reliability. Due to the long ammoniation reaction cycle, the bearing chamber of the stirring system needs to be filled with high-pressure oil during the operation of the equipment to avoid equipment damage caused by oil shortage. The traditional oil injection method requires shutdown and pressure relief before operation, resulting in a significant decrease in production efficiency; in addition, the oil injection interface is prone to oil splashing or reverse flow of hydrogen / ammonia under high-pressure conditions, which not only poses an explosion risk, but also causes oil pollution and equipment corrosion. In the prior art, the working pressure range of the oil injection device is limited, and there is a lack of effective anti-backflow and sealing designs, making it difficult to meet the safe oil filling requirements under the continuous high-pressure operation of the ammoniation reactor. Therefore, there is an urgent need for a technical solution that can achieve safe and efficient oil filling in a high-pressure environment while eliminating the risk of medium reverse flow. Summary of the Utility Model

[0003] According to the deficiencies in the above prior art, the purpose of the present utility model is to provide a high-pressure oil injection system for an ammoniation reactor, which significantly improves the anti-backflow reliability through a triple protection structure and a reverse-thread mechanical interlock design, effectively isolating the risk of reverse flow of high-pressure hydrogen / ammonia; it can adapt to high-pressure working conditions above 14 MPa and can fill oil without shutdown and pressure relief, significantly improving the production efficiency.

[0004] The present utility model is implemented by adopting the following technical solutions:

[0005] The high-pressure oil injection system for the ammoniation reactor includes an oil injector. A support plate is provided at the bottom of the oil injector, an oil barrel is placed on the support plate, and a weighing scale is provided below the support plate; the oil outlet of the oil injector is connected to an oil injection gun through a pipeline, and an oil gun connector is provided at the outlet end of the oil injection gun. The oil gun connector can be hermetically connected to the stop valve of the oil injection port assembly through a threaded structure;

[0006] The oil injection port assembly includes a pipe plug on the outside, a stop valve in the middle, and a check valve on the inside. The pipe plug and the stop valve, as well as the stop valve and the check valve, are hermetically connected through threaded structures respectively; the other end of the check valve is hermetically connected to an external oil injection conduit through a threaded structure. The external oil injection conduit penetrates through the flange of the agitator of the ammoniation reactor, is welded to the bottom along the outer wall of the stirring support frame, and extends to the bearing chamber;

[0007] It further includes an air source pipeline. One end of the air source pipeline is connected to the instrument air system, and the other end is connected to the oil injector.

[0008] The oil injector includes an air pump and a cylinder.

[0009] Below the described air pump, an oil pressing disc is connected through an oil outlet pipe, and an exhaust valve is provided on the oil pressing disc.

[0010] A lift valve and a pressure regulating valve are provided on the described oil injector.

[0011] A support device is also provided on the described oil injector.

[0012] A filter and a pressure gauge are provided on the described gas source pipeline.

[0013] The working principle of the high-pressure oil injection system for the ammoniation reactor is as follows:

[0014] During use, first remove the pipe plug of the oil injection port assembly, connect the oil gun joint at the front end of the oil gun to the stop valve. The oil gun joint and the stop valve, and the stop valve and the check valve are both sealed and connected through a threaded structure to ensure that the valve body will not loosen during use.

[0015] Nitrogen enters the gas source pipeline from the instrument air system, is purified by the filter and then connected to the oil injector. The pressure of the instrument air is stabilized at the set value through the pressure regulating valve. The support device provides support and operating space for the oil injector. By operating the lift valve, the air pump assembly rises, driving the oil pressing disc to separate from the oil barrel. Then open the exhaust valve, and use the negative pressure generated by the air pump to discharge the residual oxygen in the oil circuit system.

[0016] After closing the exhaust valve, operate the lift valve to lower the air pump assembly, and the oil pressing disc is immersed in the grease. Open the stop valve to form a continuous oil injection path from the oil barrel to the external oil injection conduit. The oil pressing disc is driven by the cylinder to perform primary pressurization on the grease. The grease enters the oil gun cavity after secondary pressurization by the air pump. The operator precisely controls the grease flow rate by adjusting the handle on the oil gun. The grease is injected into the bearing chamber through the external oil injection conduit to complete the oil replenishment operation.

[0017] During this process, the one-way conduction characteristic of the check valve ensures that the high-pressure grease can only flow unidirectionally to the bearing chamber; the external oil injection conduit is welded along the outer wall of the stirring support frame at the bottom, which not only ensures the shortest oil path but also avoids interference with the stirring operation; the weighing scale below the support plate monitors the change in the mass of the oil barrel in real time to achieve precise control of the oil injection volume; the nitrogen pressure in the gas source pipeline is monitored in real time through the pressure gauge and dynamically adjusted through the pressure regulating valve to maintain the stability of the oil injection pressure.

[0018] After the oil injection is completed, first close the stop valve to form an active cut-off. At this time, the check valve is automatically locked under the action of the pressure difference, and the double protection can completely isolate the high-pressure environment in the reactor. The pipe plug, as the third protection, forms a normally closed seal with the stop valve through the external thread during non-oil injection periods.

[0019] Through the above collaborative working mechanism, the safe oil replenishment of the ammoniation reactor under continuous high-pressure operation is successfully achieved, improving the production efficiency.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] (1) The present utility model sets up a triple protection structure of a pipe plug, a globe valve and a check valve through the oil injection port assembly, and combines the mechanical interlock design of reverse threads to realize a dual redundant protection mechanism of active cut-off of the oil injection pipeline and automatic blockage of medium backflow, significantly improving the reliability of anti-backflow, effectively isolating the risk of high-pressure hydrogen / ammonia backflow into the oil injection system, and ensuring the safe operation of the ammoniation reactor in a high-pressure environment;

[0022] (2) The high-pressure oil injection system of the ammoniation reactor described in the present utility model has a working pressure range of more than 14 MPa and adopts a metal hard seal structure to ensure explosion-proof performance in a hydrogen environment. This system can realize oil replenishment operation without stopping the machine to relieve pressure, significantly improving the production efficiency, especially suitable for chemical scenarios such as the production of terminal amino polyether that require continuous high-pressure oil injection, and meeting the requirements of typical high-pressure working conditions of the ammoniation reactor;

[0023] (3) The external oil injection conduit described in the present utility model is welded along the outer wall of the stirring support frame at the bottom. This design not only shortens the oil path length but also avoids interference with the stirring device, ensuring the smooth progress of the oil injection process. At the same time, the components of the system are reasonably designed and can be disassembled separately for maintenance without affecting the sealing performance of the overall system, reducing the maintenance cost and improving the maintainability of the system. Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of the high-pressure oil injection system of the ammoniation reactor described in the present utility model;

[0025] Figure 2 It is a structural schematic diagram of the oil injection port assembly described in the present utility model;

[0026] In the figure: 1, oil injector; 2, support plate; 3, oil barrel; 4, weighing scale; 5, oil injection gun; 6, oil gun joint; 7, globe valve; 8, check valve; 9, pipe plug; 10, external oil injection conduit; 11, ammoniation reactor; 12, flange; 13, stirring support frame; 14, bearing chamber; 15, gas source pipeline; 16, instrument air system; 17, air pump; 18, cylinder; 19, oil outlet pipe; 20, oil pressing disc; 21, exhaust valve; 22, lifting valve; 23, pressure regulating valve; 24, support device; 25, filter; 26, pressure gauge. Detailed Embodiments

[0027] In order to make the purpose and technical solutions of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] As Figure 1-2 shown, the high-pressure oil injection system of the ammoniation reactor includes an oil injector 1. A support plate 2 is provided at the bottom of the oil injector 1. An oil barrel 3 is placed on the support plate 2. A weighing scale 4 is provided below the support plate 2. The oil outlet of the oil injector 1 is connected to an oil injection gun 5 through a pipeline. An oil gun connector 6 is provided at the outlet end of the oil injection gun 5. The oil gun connector 6 can be hermetically connected to the stop valve 7 of the oil injection port assembly through a threaded structure.

[0030] The oil injection port assembly includes a pipe plug 9 on the outside, a stop valve 7 in the middle, and a check valve 8 on the inside. The pipe plug 9 and the stop valve 7, and the stop valve 7 and the check valve 8 are hermetically connected through threaded structures respectively. The other end of the check valve 8 is hermetically connected to an external oil injection conduit 10 through a threaded structure. The external oil injection conduit 10 penetrates through the flange 12 of the stirrer of the ammoniation reactor 11 and is welded to the bottom along the outer wall of the stirring support frame 13 and extends to the bearing chamber 14.

[0031] It further includes an air source pipeline 15. One end of the air source pipeline 15 is connected to an instrument air system 16, and the other end is connected to the oil injector 1.

[0032] The oil injector 1 includes an air pump 17 and a cylinder 18.

[0033] The air pump 17 is connected to an oil pressing plate 20 through an oil outlet pipe 19 below. An exhaust valve 21 is provided on the oil pressing plate 20.

[0034] A lift valve 22 and a pressure regulating valve 23 are provided on the oil injector 1.

[0035] A support device 24 is also provided on the oil injector 1.

[0036] A filter 25 and a pressure gauge 26 are provided on the air source pipeline 15.

[0037] During operation, the specific steps are as follows:

[0038] The operator removes the pipe plug 9 outside the oil filling port assembly and makes a threaded seal connection between the oil gun connector 6 at the front end of the oil gun 5 and the stop valve 7 of the oil filling port assembly to ensure that the threads between the oil gun connector 6, the stop valve 7 and the inner check valve 8 are tightly fastened without looseness. Subsequently, the instrument air system 16 is started, and nitrogen is transported to the oil injector 1 through the gas source pipeline 15. The filter 25 provided on the gas source pipeline 15 purifies the nitrogen. The pressure gauge 26 displays the pipeline pressure in real time, and the pressure is stabilized to the preset value through the pressure regulating valve 23. The support plate 2 at the bottom of the oil injector 1 bears the oil barrel 3, and the support device 24 provides stable support for the oil injector 1. The operator operates the lifting valve 22 to drive the air pump 17 assembly to rise, separating the oil pressing plate 20 from the oil barrel 3. At the same time, the exhaust valve 21 on the oil pressing plate 20 is opened, and the residual gas in the oil circuit system is discharged by using the negative pressure generated by the air pump 17.

[0039] After the exhaust is completed, the exhaust valve 21 is closed, and the operator operates the lifting valve 22 to lower the air pump 17 assembly, and the oil pressing plate 20 is immersed in the grease in the oil barrel 3. After the stop valve 7 is opened, the cylinder 18 drives the oil pressing plate 20 to perform primary pressurization on the grease. The grease enters the cavity of the air pump 17 through the oil outlet pipe 19 for secondary pressurization, forming a continuous oil filling path from the oil barrel 3 to the external oil injection conduit 10. The operator controls the flow rate of the pressurized grease by adjusting the handle of the oil gun 5, and the grease is transported to the external oil injection conduit 10 through the cavity of the oil gun 5. This conduit is welded to the outer wall of the stirring support frame 13 along the bottom to ensure the shortest oil path and avoid the stirring operation trajectory, and finally accurately transports the grease to the bearing chamber 14.

[0040] During the oil filling process, the weighing scale 4 below the support plate 2 monitors the mass change of the oil barrel 3 in real time, and dynamically adjusts the nitrogen pressure in combination with the pressure regulating valve 23 and the pressure gauge 26 to maintain the stability of the oil filling pressure. Based on the one-way conduction characteristic, the check valve 8 only allows the grease to flow into the bearing chamber 14 unidirectionally, completely blocking the reverse flow of hydrogen or ammonia. After the oil filling is completed, first close the stop valve 7 to actively cut off the oil path, and the check valve 8 automatically locks under the action of the pressure difference, forming a double isolation barrier. Finally, the pipe plug 9 is hermetically connected to the stop valve 7 through external threads, serving as a third-level protection structure to ensure that the high-pressure environment inside the ammoniation reactor 11 is completely isolated from the outside during the non-oil filling period.

[0041] Through the above process, this device realizes the safe oil replenishment of the ammoniation reactor 11 under the high-pressure operation state of 12 ± 2 MPa. Each component works together to balance efficiency and safety, significantly reducing the maintenance cost and operation risk.

Claims

1. A high-pressure oil injection system for an ammoniation reactor, characterized in that, It includes an oil injector (1). A support plate (2) is provided at the bottom of the oil injector (1). An oil barrel (3) is placed on the support plate (2). A weighing scale (4) is provided below the support plate (2). The oil outlet of the oil injector (1) is connected to an oil injection gun (5) through a pipeline. An oil gun connector (6) is provided at the outlet end of the oil injection gun (5). The oil gun connector (6) can be hermetically connected to the stop valve (7) of the oil injection port assembly through a threaded structure. The oil injection port assembly includes a pipe plug (9) on the outside, a stop valve (7) in the middle, and a check valve (8) on the inside. The pipe plug (9) and the stop valve (7), and the stop valve (7) and the check valve (8) are hermetically connected through threaded structures respectively. The other end of the check valve (8) is hermetically connected to an external oil injection conduit (10) through a threaded structure. The external oil injection conduit (10) penetrates through the flange (12) of the stirrer of the ammoniation reactor (11), is welded to the outer wall of the stirring support frame (13) along the bottom, and extends to the bearing chamber (14). It further includes an air source pipeline (15). One end of the air source pipeline (15) is connected to an instrument air system (16), and the other end is connected to the oil injector (1).

2. The high-pressure oil injection system for the ammoniation reactor according to claim 1, wherein, The oil injector (1) described above includes an air pump (17) and a cylinder (18).

3. The high-pressure oil injection system for the ammoniation reactor according to claim 2, wherein Below the air pump (17), an oil pressing plate (20) is connected through an oil outlet pipe (19). An exhaust valve (21) is provided on the oil pressing plate (20).

4. The high-pressure oil injection system for the ammoniation reactor according to claim 1, wherein A lift valve (22) and a pressure regulating valve (23) are provided on the oil injector (1).

5. The high-pressure oil injection system for an ammoniation reactor according to claim 1, characterized in that, A support device (24) is further provided on the oil injector (1).

6. The high-pressure oil injection system for an ammoniation reactor according to claim 1, wherein A filter (25) and a pressure gauge (26) are provided on the air source pipeline (15).

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