Hydrogenation process equipment

Abstract

The utility model relates to the technical field of hydrogenation process, and provides hydrogenation process equipment which comprises a gas-liquid mixing pipeline, a reaction device, a high-pressure separator, a low-pressure separator, a stabilizing tower, a first gas supplementing pipeline, a second gas supplementing pipeline and a distillation device, the high-pressure separator is communicated with the low-pressure separator through a first connecting pipeline, and the low-pressure separator is communicated with the stabilizing tower through a second connecting pipeline; the first air supply pipeline is communicated with the first connecting pipeline, and the second air supply pipeline is communicated with the second connecting pipeline. According to the utility model, not only is the first gas supplementing pipeline arranged at the inlet of the low-pressure separator to bring most ammonia in the generated oil into the emptying system, but also the second gas supplementing pipeline is arranged at the liquid phase outlet of the low-pressure separator to ensure the operation pressure of the stabilizing tower, so that the residual ammonia is discharged from the top of the stabilizing tower; the problem of corrosion of three-way electromagnetic valves at the tops of the stabilizing tower and a subsequent distillation tower is avoided, and stable operation and data acquisition accuracy of the whole device are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogenation process, in particular to a hydrogenation process equipment. Background Art

[0002] With the development of the petrochemical industry and the deterioration of crude oil quality, the importance of hydroprocessing in oil refining technology continues to increase. As a key equipment used for new process development, catalyst performance evaluation, simulation of industrial unit operating conditions and providing basic design data, the hydrogenation test unit plays a vital role in the transformation and optimization of oil refining units.

[0003] During the actual operation of the hydrogenation test equipment currently on the market, the nitrogen compounds contained in the crude oil will be converted into ammonia and react with sulfides to form ammonium salt compounds. These ammonium salt compounds tend to exist in the circulating hydrogen gas flow in gaseous form at high temperatures and continue to accumulate and concentrate.

[0004] However, when the existing hydrogenation test equipment processes high-sulfur and high-ammonia raw materials, there is a problem of ammonium salt compounds crystallizing and precipitating in the circulating hydrogen pipeline and clogging the pipeline, especially at the three-way solenoid valve position at the top of the stabilization tower and the distillation tower at the rear end of the low-pressure separator. Due to the frequent occurrence of ammonium salt corrosion, the valves are seriously damaged, which not only affects the progress of the test, but also reduces the accuracy of the test results.

[0005] In view of this, the utility model aims to provide an improved hydrogenation process device to address the key problem of the existing hydrogenation test device being damaged by ammonium salt corrosion when processing raw materials containing high levels of hydrogen sulfide and ammonia, especially the three-way solenoid valve at the top of the stabilization tower, so as to ensure stable operation of the device, extend the service life of the equipment, and improve the reliability of experimental data, thereby providing a more reliable design basis for the transformation and optimization of petrochemical enterprises' refining devices. Utility Model Content

[0006] The utility model provides a hydrogenation process equipment, which is used to solve the problem that when a hydrogenation test device in the prior art processes high-sulfur and high-ammonia raw materials, ammonium salt compounds crystallize and precipitate in a circulating hydrogen pipeline and block the pipeline.

[0007] The utility model provides a hydrogenation process equipment, including a gas-liquid mixing pipeline, a reaction device, a high-pressure separator, a low-pressure separator, a stabilizing tower, a first gas supplement pipeline, a second gas supplement pipeline and a distillation device;

[0008] The gas-liquid mixing pipeline is connected to the inlet of the reaction device, the outlet of the reaction device is connected to the inlet of the high-pressure separator through a pipeline, the liquid outlet of the high-pressure separator is connected to the inlet of the low-pressure separator through a first connecting pipeline, the outlet of the low-pressure separator is connected to the inlet of the stabilization tower through a second connecting pipeline, and the bottom outlet of the stabilization tower is connected to the distillation device;

[0009] The first air supply pipeline is in communication with the first connecting pipeline, and the second air supply pipeline is in communication with the second connecting pipeline.

[0010] According to the hydrogenation process equipment provided by the utility model, it also includes a washing tower and a washing water pipeline. The gas outlet of the high-pressure separator is connected to the inlet of the washing tower through a third connecting pipeline, and the washing water pipeline is connected to the third connecting pipeline.

[0011] According to the hydrogenation process equipment provided by the utility model, it also includes a hydrogen mixing tank, the gas outlet of the washing tower is connected to the hydrogen mixing tank through a compressor and a pipeline, and the hydrogen mixing tank is connected to the inlet of the reaction device.

[0012] The hydrogenation process equipment provided by the utility model also includes a hydrogen replenishment pipeline, and the hydrogen replenishment pipeline is connected to the hydrogen mixing tank.

[0013] According to the hydrogenation process equipment provided by the utility model, the distillation device includes an atmospheric distillation tower and a vacuum distillation tower, the inlet of the atmospheric distillation tower is connected to the liquid outlet of the stabilization tower, and the liquid outlet of the atmospheric distillation tower is connected to the inlet of the vacuum distillation tower.

[0014] According to the hydrogenation process equipment provided by the utility model, the tail oil outlet of the vacuum distillation tower is connected to the reaction device.

[0015] According to the hydrogenation process equipment provided by the utility model, the reaction device includes a plurality of hydrogenation reactors.

[0016] According to the hydrogenation process equipment provided by the utility model, a plurality of hydrogenation reactors are connected in series in sequence, the inlet of the first hydrogenation reactor in the series connection sequence is connected to the gas-liquid mixing pipeline, and the outlet of the last hydrogenation reactor in the series connection sequence is connected to the high-pressure separator.

[0017] The hydrogenation process equipment provided by the utility model not only sets a first air supply pipeline at the inlet of the low-pressure separator to bring out most of the ammonia in the generated oil to the venting system, but also sets a second air supply pipeline at the liquid phase outlet of the low-pressure separator to ensure the operating pressure of the stabilization tower, so that the remaining ammonia is discharged at the top of the stabilization tower, which significantly reduces the hydrogen sulfide content of the oil in the stabilization tower, avoids the corrosion problem of the three-way solenoid valve at the top of the stabilization tower and the top of the subsequent distillation tower, and because the gas flow rate is increased, the temperature of the oil discharge solenoid valve at the top of the stabilization tower is reduced, thereby ensuring the stable operation of the entire device and the accuracy of data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the hydrogenation process equipment provided by the utility model;

[0020] Reference numerals:

[0021] 1. Hydrogenation reactor; 2. High-pressure separator; 3. Low-pressure separator; 4. Stabilization tower; 5. Atmospheric distillation tower; 6. Vacuum distillation tower; 7. Washing tower; 8. Hydrogen mixing tank; 9. Gas-liquid mixing pipeline; 10. Crude oil pipeline; 11. Circulating hydrogen supply pipeline; 12. Washing water pipeline; 13. First air supply pipeline; 14. Second air supply pipeline; 15. Hydrogen supply pipeline. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0023] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] Combine the following Figure 1 The hydrogenation process equipment of the utility model is described, including a gas-liquid mixing pipeline 9, a reaction device, a high-pressure separator 2, a low-pressure separator 3, a stabilizing tower 4, a first gas supply pipeline 13, a second gas supply pipeline 14 and a distillation device; the gas-liquid mixing pipeline 9 is connected to the inlet of the reaction device, the outlet of the reaction device is connected to the inlet of the high-pressure separator 2 through a pipeline, the liquid outlet of the high-pressure separator 2 is connected to the inlet of the low-pressure separator 3 through a first connecting pipeline, the outlet of the low-pressure separator 3 is connected to the inlet of the stabilizing tower 4 through a second connecting pipeline, and the bottom outlet of the stabilizing tower 4 is connected to the distillation device; the first gas supply pipeline 13 is connected to the first connecting pipeline, and the second gas supply pipeline 14 is connected to the second connecting pipeline.

[0028] In this embodiment, the inlet of the gas-liquid mixing pipeline 9 is connected to the raw oil pipeline 10 and the circulating hydrogen supply pipeline 11 respectively, and the outlet is connected to the reaction device. The raw oil from the raw oil pipeline 10 is mixed with the hydrogen from the circulating hydrogen supply pipeline 11 and then enters the reaction device to carry out desulfurization, denitrogenation and aromatic saturation reactions under the action of hydrogen and catalyst. The reaction effluent enters the high-pressure separator 2, and the liquid phase of the high-pressure separator 2 is mixed with the supplementary gas from the first air supply pipeline 13 and then enters the low-pressure separator 3. The liquid phase discharged from the bottom of the low-pressure separator 3 is mixed with the supplementary gas from the second air supply pipeline 14 and then enters the stabilization tower 4. The material discharged from the bottom of the stabilization tower 4 enters the atmospheric distillation tower 5.

[0029] In this process, the gas is supplemented at the inlet of the low-pressure separator 3 through the first gas supplement pipeline 13, and most of the ammonia in the generated oil is effectively taken out to the venting system in gaseous form, which significantly reduces the risk of ammonium salt accumulation in downstream equipment. The gas is also supplemented at the liquid phase outlet of the low-pressure separator 3 through the second gas supplement pipeline 14, so that the remaining ammonia partial pressure is further reduced and effectively discharged at the top of the stabilization tower 4, thereby greatly reducing the hydrogen sulfide content of the oil in the stabilization tower 4 to an almost negligible level. Due to the implementation of the above-mentioned double gas supplement measures, not only the corrosion effect of ammonium salt on the top of the stabilization tower 4 and the three-way solenoid valve at the top of the subsequent distillation tower is significantly reduced, and due to the increase in gas flow rate, the temperature of the oil discharge solenoid valve at the top of the stabilization tower is reduced, the service life and operational stability of these key components are guaranteed, and the accuracy and reliability of data acquisition of the entire device are greatly improved, ensuring the smooth progress and optimization effect of the oil refining process.

[0030] In some embodiments, the hydrogenation process equipment further includes a washing tower 7 and a washing water pipeline 12, the gas outlet of the high-pressure separator 2 is connected to the inlet of the washing tower 7 through a third connecting pipeline, and the washing water pipeline 12 is connected to the third connecting pipeline.

[0031] In the present embodiment, the hydrogenation process equipment is further equipped with a washing tower 7 and a supporting washing water pipeline 12 to optimize the processing flow. Specifically, after the high-pressure separator 2 completes the preliminary separation, the gas product discharged from its top does not directly enter the circulation system, but is introduced into the washing tower 7 through a third connecting pipeline connected thereto. At the same time, the washing water pipeline 12 is interconnected with the third connecting pipeline, so that the gas phase material from the high-pressure separator 2 can be fully washed by washing water before entering the washing tower 7, effectively removing the ammonium salt compounds and other harmful impurities carried therein. This design step strengthens the removal effect of the ammonium salt compounds in the circulating hydrogen, prevents these compounds from accumulating and forming crystals inside the pipeline and equipment during the subsequent circulation process, thereby reducing the corrosion risk of key components such as the three-way solenoid valve on the top of the stabilizing tower 4. By washing and purifying the circulating hydrogen gas, not only the safety and stability of the operation of the entire hydrogenation test device are ensured, but also the purity of the final product and the data accuracy of the entire hydrogenation process are improved. This additional washing step provides a more complete solution to the problems caused by ammonium salt compounds in the prior art, and has significant technical value for maintaining long-term, efficient and trouble-free operation of the device.

[0032] In some embodiments of the present invention, the hydrogenation process equipment further includes a hydrogen mixing tank 8, and the gas outlet of the scrubbing tower 7 is connected to the hydrogen mixing tank 8 through a compressor and a pipeline, and the hydrogen mixing tank 8 is connected to the inlet of the reaction device.

[0033] After the washing tower 7 completes the washing of the gas phase product of the high-pressure separator 2, the purified gas is connected to a compressor through a specific gas outlet. The pressure of the gas treated by the compressor is increased and introduced into the hydrogen mixing tank 8 through a pipeline. As an important intermediate link, the hydrogen mixing tank 8 fully mixes the hydrogen from the washing tower 7 and pressurized by the compressor with the new hydrogen or other supplementary gas to ensure that the hydrogen component content entering the reaction device is stable and meets the process requirements. In this way, not only the efficient hydrogenation reaction is guaranteed, but also the reaction conditions can be effectively controlled to prevent problems such as low reaction efficiency or aggravated side reactions caused by uneven gas composition. Finally, the mixed hydrogen output from the hydrogen mixing tank 8 is directly sent to the entrance of the reaction device through a connecting pipeline, and participates in key chemical reactions such as desulfurization, denitrogenation and aromatic saturation of the crude oil, thereby achieving a deep modification of the quality of the crude oil and ensuring the continuity and stability of the entire hydrogenation process. It not only solves the problem of ammonium salt corrosion, but also improves the safety and economic benefits of equipment operation.

[0034] In some embodiments of the present invention, the hydrogenation process equipment further includes a hydrogen replenishment pipeline 15 , and the hydrogen replenishment pipeline 15 is connected to the hydrogen mixing tank 8 .

[0035] The hydrogen replenishment pipeline 15 is directly connected to the hydrogen mixing tank 8, and its main function is to replenish new hydrogen or treated pure hydrogen into the hydrogen mixing tank 8. When the concentration of hydrogen in the circulating hydrogen system decreases due to consumption or loss, additional hydrogen can be injected into the hydrogen mixing tank 8 in time through the hydrogen replenishment pipeline 15 to maintain the constant hydrogen partial pressure in the mixed gas, thereby ensuring that the hydrogen-to-oil ratio entering the hydrogenation reactor 1 is in the optimal range, thereby promoting efficient chemical reactions such as desulfurization, denitrogenation and aromatic saturation. In addition, sufficient hydrogen supply can also effectively avoid catalyst deactivation or other adverse reaction phenomena caused by insufficient hydrogen, further ensuring the stable operation of the entire device and product quality control.

[0036] In some embodiments of the present invention, the distillation device includes an atmospheric distillation tower 5 and a vacuum distillation tower 6, the inlet of the atmospheric distillation tower 5 is connected to the liquid outlet of the stabilization tower 4, and the liquid outlet of the atmospheric distillation tower 5 is connected to the inlet of the vacuum distillation tower 6.

[0037] In this embodiment, the distillation device is designed to include two parts: an atmospheric distillation tower 5 and a vacuum distillation tower 6. The outlet of the liquid product treated by the stabilization tower 4 is directly connected to the inlet of the atmospheric distillation tower 5, realizing the continuous transfer of materials. In the atmospheric distillation tower 5, the crude oil is preliminarily fractionated and separated according to the difference in boiling points of different components. The lighter components rise and are discharged through the top collection system, while the heavy components flow out from the bottom of the atmospheric distillation tower 5. The liquid product at the bottom of the atmospheric distillation tower 5 is transported to the inlet of the vacuum distillation tower 6 through a special pipeline for more refined deep distillation. Under reduced pressure, the tower can achieve a more thorough separation of heavy components, thereby extracting more valuable products and reducing the content of residual impurities. Such a series arrangement makes the entire distillation process more efficient and can adapt to different process requirements, ensuring the refining effect and quality optimization of the hydrogenated product.

[0038] In some embodiments of the utility model, the tail oil outlet of the vacuum distillation tower 6 is connected to the reaction unit. After the vacuum distillation tower 6 completes the separation of the heavy components, the tail oil discharged from the bottom thereof that is not completely converted or contains high residual sulfur, nitrogen compounds and other impurities will not be directly discarded, but will be refluxed to the reaction unit through a pipeline for reprocessing. This circulation design is conducive to improving the utilization rate of raw materials and reducing waste emissions, and realizing the effective recycling of resources. After re-entering the reaction unit, these tail oils will undergo hydrodesulfurization, denitrogenation and other treatment processes again to further improve their quality, meet higher product specifications or be converted into more easily handled and valuable intermediates, thereby enhancing the economy and environmental performance of the entire process.

[0039] In some embodiments of the present invention, in order to adapt to different working conditions and improve the efficiency of hydroprocessing, the reaction device is configured to include one or more hydrogenation reactors 1 connected in series or in parallel.

[0040] In an optional embodiment, multiple hydrogenation reactors 1 are designed in a serial structure. In this case, the inlet of the first hydrogenation reactor 1 is directly connected to the gas-liquid mixing pipeline 9 to ensure that the feedstock oil and the circulating hydrogen are fully mixed and immediately enter the first reaction link for preliminary conversion. After the step-by-step reaction, the outlet of the last hydrogenation reactor 1 is connected to the high-pressure separator 2 to transport the products after the multi-stage reaction to the subsequent separation step.

[0041] Another optional method is to use a parallel arrangement of hydrogenation reactors 1. In this configuration, the inlets of all parallel hydrogenation reactors 1 are independently connected to the gas-liquid mixing pipeline 9, so that the same batch of raw materials can be hydrogenated at multiple points and multiple paths at the same time, thereby improving the processing capacity and reaction rate of the overall equipment. The outlets of these parallel hydrogenation reactors 1 are uniformly converged to the high-pressure separator 2 to ensure that the products obtained by each reaction route can be effectively separated and collected.

[0042] These two different layouts are designed to optimize the process flow and provide flexible and efficient solutions for different raw material properties, product specifications and production requirements. By properly selecting the connection method of the reactor, better material distribution, reaction condition control and resource utilization efficiency can be achieved, thereby improving the overall performance of the entire hydrogenation process unit.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A hydrogenation process equipment, characterized in that: It includes a gas-liquid mixing pipeline, a reaction device, a high-pressure separator, a low-pressure separator, a stabilization tower, a first gas supply pipeline, a second gas supply pipeline and a distillation device; The gas-liquid mixing pipeline is connected to the inlet of the reaction device, the outlet of the reaction device is connected to the inlet of the high-pressure separator through a pipeline, the liquid outlet of the high-pressure separator is connected to the inlet of the low-pressure separator through a first connecting pipeline, the outlet of the low-pressure separator is connected to the inlet of the stabilization tower through a second connecting pipeline, and the bottom outlet of the stabilization tower is connected to the distillation device; The first air supply pipeline is in communication with the first connecting pipeline, and the second air supply pipeline is in communication with the second connecting pipeline.

2. The hydrogenation process equipment according to claim 1, characterized in that: It also includes a washing tower and a washing water pipeline. The gas outlet of the high-pressure separator is connected to the inlet of the washing tower through a third connecting pipeline, and the washing water pipeline is connected to the third connecting pipeline.

3. The hydrogenation process equipment according to claim 2, characterized in that: It also includes a hydrogen mixing tank. The gas outlet of the scrubbing tower is connected to the hydrogen mixing tank through a compressor and a pipeline. The hydrogen mixing tank is connected to the inlet of the reaction device.

4. The hydrogenation process equipment according to claim 3, characterized in that: It also includes a hydrogen replenishing pipeline, which is connected to the hydrogen mixing tank.

5. The hydrogenation process equipment according to any one of claims 1 to 4, characterized in that: The distillation device comprises an atmospheric distillation tower and a vacuum distillation tower, the inlet of the atmospheric distillation tower is communicated with the liquid outlet of the stabilization tower, and the liquid outlet of the atmospheric distillation tower is communicated with the inlet of the vacuum distillation tower.

6. The hydrogenation process equipment according to claim 5, characterized in that: The tail oil outlet of the vacuum distillation tower is connected to the reaction device.

7. The hydrogenation process equipment according to claim 1, characterized in that: The reaction device comprises a plurality of hydrogenation reactors.

8. The hydrogenation process equipment according to claim 7, characterized in that: The plurality of hydrogenation reactors are connected in series in sequence, the inlet of the first hydrogenation reactor in the series connection sequence is connected to the gas-liquid mixing pipeline, and the outlet of the last hydrogenation reactor in the series connection sequence is connected to the high-pressure separator.

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