Solid-state hydrogen storage and waste lubricating oil regeneration coupling system

Abstract

The utility model relates to solid state hydrogen storage technical field discloses a kind of solid state hydrogen storage and waste lubricating oil regeneration coupling system.The utility model provides a kind of solid state hydrogen storage and waste lubricating oil regeneration coupling system on one hand, the system includes: the liquid phase entrance of hydrogenation finishing reactor is connected with the outlet of waste lubricating oil raw material tank;Hydrogen gas outlet of low-pressure solid state hydrogen storage tank is connected with hydrogen gas entrance of high-pressure solid state hydrogen storage tank;Hydrogen gas outlet of high-pressure solid state hydrogen storage tank is connected with hydrogen gas entrance of hydrogenation finishing reactor;The first entrance of heat conducting medium heat exchanger is connected with the outlet of hydrogenation finishing reactor;The first outlet of heat conducting medium heat exchanger is connected with the heat conducting medium entrance of low-pressure solid state hydrogen storage tank and the heat conducting medium entrance of high-pressure solid state hydrogen storage tank respectively.The system of the utility model uses low solid state hydrogen storage tank, high-pressure solid state hydrogen storage tank instead of the use of high-pressure heat exchanger, hydrogen compressor, effectively avoids the high maintenance cost and high-pressure risk of hydrogen compressor etc.

Description

Technical Field

[0001] This utility model relates to the field of solid hydrogen storage technology, specifically to a solid hydrogen storage and waste lubricating oil regeneration coupling system. Background Technology

[0002] After a period of use, lubricating oil deteriorates due to physical, chemical, or human factors, generating oxygen-containing compounds, sulfur-containing compounds, gums, asphaltenes, etc. Besides containing 2%-10% of deteriorated substances, the remaining 90%-98% of waste lubricating oil are renewable and recyclable components. Direct disposal or incineration not only causes serious environmental pollution but also results in a severe waste of resources. Therefore, vigorously developing waste lubricating oil recycling is one of the important ways to improve resource recycling efficiency, protect the environment, and build a resource-saving society. Currently, hydrorefining is one of the most important methods in waste lubricating oil regeneration. Hydrorefining operates at temperatures of 320℃-400℃ and pressures of 6MPa-12MPa. At present, the disadvantages of hydrogen supply in hydrorefining mainly include expensive equipment, high operating costs, and high hydrogen consumption. Furthermore, the use of high-pressure heat exchangers and compressors in the hydrorefining process increases equipment complexity and maintenance costs. High-pressure heat exchangers need to operate under high temperature, high pressure, and hydrogen-exposed conditions, with many sealing points, making them prone to leakage problems. The compressor is the core component of the hydrogenation unit. Its uninterrupted operation is crucial for maintaining the normal operation of the unit. If a problem occurs, it may lead to the unit's shutdown and affect production efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the problems existing in the prior art and provide a coupling system for solid-state hydrogen storage and waste lubricating oil regeneration. The system of this invention uses low-pressure solid-state hydrogen storage tanks and high-pressure solid-state hydrogen storage tanks instead of high-pressure heat exchangers and hydrogen compressors, effectively avoiding the high maintenance costs and high-pressure risks associated with hydrogen compressors.

[0004] To achieve the above objectives, this utility model provides a solid-state hydrogen storage and waste lubricating oil regeneration coupling system, the system comprising: a waste lubricating oil raw material tank, a heat transfer medium heat exchanger, a hydrogenation refining reactor, a low-pressure solid-state hydrogen storage tank, and a high-pressure solid-state hydrogen storage tank.

[0005] The outlet of the waste lubricating oil raw material tank is connected to the liquid phase inlet of the hydrorefining reactor;

[0006] The hydrogen outlet of the low-pressure solid hydrogen storage tank is connected to the hydrogen inlet of the high-pressure solid hydrogen storage tank.

[0007] The hydrogen outlet of the high-pressure solid hydrogen storage tank is connected to the hydrogen inlet of the hydrorefining reactor.

[0008] The first inlet of the heat exchanger is connected to the outlet of the hydrorefining reactor; the first outlet of the heat exchanger is connected to the heat inlet of the low-pressure solid hydrogen storage tank and the heat inlet of the high-pressure solid hydrogen storage tank, respectively.

[0009] In existing technologies, hydrorefining is one of the most important methods in the regeneration process of waste lubricating oil. However, hydrorefining still faces some problems that urgently need to be solved. For example, the disadvantages of hydrogen supply mainly include expensive equipment, high operating costs, and high hydrogen consumption. The use of high-pressure heat exchangers and compressors in the hydrorefining process also increases the complexity of the equipment and maintenance costs. High-pressure heat exchangers need to operate under high temperature, high pressure, and hydrogen-rich conditions, and have many sealing points, making them prone to leakage problems. The compressor is the core component of the hydrorefining unit, and its uninterrupted operation is crucial for maintaining the normal operation of the unit. Once a problem occurs, it may lead to unit shutdown and affect production efficiency. The solid-state hydrogen storage and waste lubricating oil regeneration coupling system provided by this utility model uses low-pressure solid-state hydrogen storage tanks and high-pressure solid-state hydrogen storage tanks instead of high-pressure heat exchangers and hydrogen compressors. This effectively solves the problems in the hydrogen supply process of waste lubricating oil hydrorefining and also solves the problems of using high-pressure heat exchangers and compressors, thus improving economic efficiency. The system provided by this utility model uses a heat-conducting medium heat exchanger connected to the hydrorefining reactor and the low-pressure and high-pressure solid-state hydrogen storage tanks for hydrorefining, hydrogen absorption / desorption temperature regulation, and waste heat utilization, solving the problem of using high-power equipment such as heating furnaces. Preferably, the system utilizes the changes in hydrogen absorption / desorption temperature of the low-pressure and high-pressure solid-state hydrogen storage tanks, and further utilizes waste heat through the heat-conducting medium heat exchanger, saving energy and improving the heating efficiency of the device. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the solid hydrogen storage and waste lubricating oil regeneration coupling system provided by this utility model.

[0011] Explanation of reference numerals in the attached figures

[0012] 1. Waste lubricating oil raw material tank; 2. Dehydration and impurity removal tank; 3. Heat exchanger for heat transfer medium;

[0013] 4. Hydrogenation refining reactor; 5. Low-pressure solid hydrogen storage tank; 6. High-pressure solid hydrogen storage tank;

[0014] 7. Product tank; 8. Hydrogen source. Detailed Implementation

[0015] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0016] In this invention, the terms "first," "second," and "third" do not limit the substances and operations, but are only used to distinguish the substances introduced in different steps and the operations performed in different stages.

[0017] This utility model provides a solid hydrogen storage and waste lubricating oil regeneration coupling system, the system comprising: a waste lubricating oil raw material tank 1, a heat transfer medium heat exchanger 3, a hydrorefining reactor 4, a low-pressure solid hydrogen storage tank 5, and a high-pressure solid hydrogen storage tank 6.

[0018] The outlet of the waste lubricating oil raw material tank 1 is connected to the liquid phase inlet of the hydrorefining reactor 4;

[0019] The hydrogen outlet of the low-pressure solid hydrogen storage tank 5 is connected to the hydrogen inlet of the high-pressure solid hydrogen storage tank 6.

[0020] The hydrogen outlet of the high-pressure solid hydrogen storage tank 6 is connected to the hydrogen inlet of the hydrorefining reactor 4.

[0021] The first inlet of the heat exchanger 3 is connected to the outlet of the hydrorefining reactor 4; the first outlet of the heat exchanger 3 is connected to the heat inlet of the low-pressure solid hydrogen storage tank 5 and the heat inlet of the high-pressure solid hydrogen storage tank 6, respectively.

[0022] In this invention, the first inlet of the heat exchanger 3 is connected to the outlet of the hydrorefining reactor 4; the first outlet of the heat exchanger 3 is connected to the heat inlet of the low-pressure solid hydrogen storage tank 5 and the heat inlet of the high-pressure solid hydrogen storage tank 6, respectively. This preferred embodiment fully utilizes the waste heat released from the hydrorefining reaction, effectively improving energy utilization efficiency.

[0023] According to a preferred embodiment of this invention, the heat transfer medium outlets of the low-pressure solid hydrogen storage tank 5 and the high-pressure solid hydrogen storage tank 6 are respectively connected to the second inlet of the heat transfer medium heat exchanger 3. This preferred embodiment utilizes the temperature changes of hydrogen absorption / desorption in the low-pressure and high-pressure solid hydrogen storage tanks, further utilizing waste heat through the heat transfer medium heat exchanger, thus saving energy and improving the device's heating efficiency.

[0024] In this invention, industrial hydrogen is fed into a low-pressure solid hydrogen storage tank 5 to provide a hydrogen source.

[0025] According to a preferred embodiment of this invention, the impurity outlet of the hydrorefining reactor 4 is connected to the impurity inlet of the low-pressure solid hydrogen storage tank 5. This preferred embodiment can adsorb impurities such as H2S and NH3 generated during the hydrorefining process, reducing equipment investment; simultaneously, unreacted hydrogen can be recycled.

[0026] According to a preferred embodiment of the present invention, the impurity outlet of the hydrorefining reactor 4 is connected to the impurity inlet of the low-pressure solid hydrogen storage tank 5 via a pressure reducing valve.

[0027] According to a preferred embodiment of the present invention, the system further includes a product tank 7, which is disposed after the hydrorefining reactor 4 and is used to collect the hydrorefined product.

[0028] This invention does not specifically limit the types of the low-pressure solid hydrogen storage tank 5 and the high-pressure solid hydrogen storage tank 6, and they can be various solid hydrogen storage tanks commonly found in the art.

[0029] According to a preferred embodiment of the present invention, the high-pressure solid hydrogen storage tank 6 is provided with a high-pressure hydrogen storage material bed inside.

[0030] This invention does not impose any particular limitation on the location of the high-pressure hydrogen storage material bed; conventional methods in the field can be used as a reference.

[0031] According to a preferred embodiment of the present invention, the low-pressure solid hydrogen storage tank 5 is provided with a low-pressure hydrogen storage material bed inside.

[0032] This invention does not impose any particular limitation on the location of the low-pressure hydrogen storage material bed; it can be carried out by referring to conventional methods in the field.

[0033] In this invention, high pressure and low pressure are achieved primarily by filling the solid hydrogen storage tank with different hydrogen storage materials. The specific types of hydrogen storage materials selected can be those conventionally chosen in this field.

[0034] This invention does not impose any particular limitation on the specific type of the heat exchanger 3, and it can be any type of heat exchanger commonly found in the art. According to a preferred embodiment of this invention, the heat exchanger 3 is selected from at least one of shell-and-tube heat exchangers, coaxial heat exchangers, and finned-tube heat exchangers.

[0035] In this invention, the heat-conducting medium can be any conventional choice in the art. This invention exemplarily uses heat-conducting oil as the heat-conducting medium.

[0036] This invention does not impose any particular limitation on the specific type of the hydrorefining reactor 4, and any conventional choice in the art can be made. According to a preferred embodiment of this invention, the hydrorefining reactor 4 is selected from at least one of a fixed-bed reactor, a fluidized-bed reactor, and a slurry-bed reactor.

[0037] According to a preferred embodiment of the present invention, the system further includes a dehydration and impurity removal tank 2, which is disposed between the waste lubricating oil raw material tank 1 and the hydrorefining reactor 4.

[0038] This invention does not impose any particular limitation on the specific type of the dehydration and impurity removal tank 2, and any conventional choice in the field is acceptable.

[0039] According to a preferred embodiment of the present invention, the inlet of the dehydration and impurity removal tank 2 is connected to the outlet of the waste lubricating oil raw material tank 1;

[0040] The outlet of the dehydration and impurity removal tank 2 is connected to the liquid phase inlet of the hydrorefining reactor 4.

[0041] According to a specific embodiment of this utility model, please refer to Figure 1 Waste lubricating oil is pumped from waste lubricating oil raw material tank 1 into dehydration and impurity removal tank 2 for dehydration and impurity removal, and then sent to hydrorefining reactor 4 for heating to the reaction temperature;

[0042] Industrial hydrogen (hydrogen source 8) is piped into low-pressure solid hydrogen storage tank 5 at a pressure not exceeding 1.6 MPa. Under the conditions of room temperature and pressure not exceeding 1.6 MPa, hydrogen is absorbed until saturation. The heat transfer medium is heated to 100-200℃ through heat transfer medium heat exchanger 3 to maintain the internal pressure of low-pressure solid hydrogen storage tank 5 at ≥10 MPa to release hydrogen. The hydrogen then enters high-pressure solid hydrogen storage tank 6, where it is absorbed until saturation under the conditions of room temperature and pressure ≥10 MPa. The heat transfer medium heat exchanger 3 is then heated to 40-60℃ to maintain the internal pressure of tank ≤20 MPa. Hydrogen is released under the condition of pressure ≤20 MPa. The pressure is then adjusted to the required pressure of hydrorefining reactor 4 through a pressure reducing valve and sent into hydrorefining reactor 4.

[0043] In the hydrorefining reactor 4, the dehydrated and impurity-removed waste lubricating oil undergoes a hydrorefining reaction with hydrogen from the high-pressure solid hydrogen storage tank 6 to obtain the product lubricating oil base oil, which is then sent to the product tank 7. The unreacted hydrogen and impurity gases such as H2S and NH3 are depressurized by a pressure reducing valve and then sent to the low-pressure solid hydrogen storage tank 5. The unreacted hydrogen is recycled, while the impurity gases such as H2S and NH3 are absorbed and treated.

[0044] The waste heat generated by the hydrorefining reaction is exchanged through the heat transfer medium heat exchanger 3, providing at least part of the heat for the hydrogen release from the low-pressure solid hydrogen storage tank 5 and the high-pressure solid hydrogen storage tank 6; the heat released by the hydrogen absorbed by the low-pressure solid hydrogen storage tank 5 and the high-pressure solid hydrogen storage tank 6 is exchanged through the heat transfer medium heat exchanger 3, providing at least part of the heat for the process of heating the dehydrated and impurity-removed waste lubricating oil to the reaction temperature, thereby reducing the energy consumption of high-power equipment such as heating furnaces.

[0045] The system provided by this utility model, based on the prior art, replaces the use of high-pressure heat exchangers and hydrogen compressors with low-pressure solid hydrogen storage tanks and high-pressure solid hydrogen storage tanks, effectively avoiding the high maintenance costs and high-pressure risks associated with hydrogen compressors. By using a heat transfer medium heat exchanger to connect the hydrogen refining reactor, the low-pressure solid hydrogen storage tank, and the high-pressure solid hydrogen storage tank, it is used for hydrogen refining, hydrogen absorption / desorption temperature regulation, and waste heat utilization, solving the problem of using high-power equipment such as heating furnaces. At the same time, by utilizing the changes in the hydrogen absorption / desorption temperature of the hydrogen storage alloy, waste heat is further utilized through a heat transfer oil heat exchanger, saving energy and improving the heating efficiency of the device.

[0046] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. A solid-state hydrogen storage and waste lubricating oil regeneration coupling system, characterized in that, The system includes: a waste lubricating oil raw material tank (1), a heat transfer medium heat exchanger (3), a hydrorefining reactor (4), a low-pressure solid hydrogen storage tank (5), and a high-pressure solid hydrogen storage tank (6); The outlet of the waste lubricating oil raw material tank (1) is connected to the liquid phase inlet of the hydrorefining reactor (4); The hydrogen outlet of the low-pressure solid hydrogen storage tank (5) is connected to the hydrogen inlet of the high-pressure solid hydrogen storage tank (6); The hydrogen outlet of the high-pressure solid hydrogen storage tank (6) is connected to the hydrogen inlet of the hydrorefining reactor (4); The first inlet of the heat exchanger (3) is connected to the outlet of the hydrorefining reactor (4); the first outlet of the heat exchanger (3) is connected to the heat inlet of the low-pressure solid hydrogen storage tank (5) and the heat inlet of the high-pressure solid hydrogen storage tank (6), respectively.

2. The system according to claim 1, characterized in that, The heat transfer medium outlet of the low-pressure solid hydrogen storage tank (5) and the heat transfer medium outlet of the high-pressure solid hydrogen storage tank (6) are respectively connected to the second inlet of the heat transfer medium heat exchanger (3).

3. The system according to claim 1, characterized in that, The impurity outlet of the hydrogen refining reactor (4) is connected to the impurity inlet of the low-pressure solid hydrogen storage tank (5).

4. The system according to claim 3, characterized in that, The impurity outlet of the hydrogen refining reactor (4) is connected to the impurity inlet of the low-pressure solid hydrogen storage tank (5) via a pressure reducing valve.

5. The system according to any one of claims 1-4, characterized in that, The high-pressure solid hydrogen storage tank (6) is equipped with a high-pressure hydrogen storage material bed.

6. The system according to any one of claims 1-4, characterized in that, The low-pressure solid hydrogen storage tank (5) is equipped with a low-pressure hydrogen storage material bed.

7. The system according to any one of claims 1-4, characterized in that, The heat exchanger (3) is selected from at least one of shell-and-tube heat exchangers, coaxial heat exchangers and finned tube heat exchangers.

8. The system according to any one of claims 1-4, characterized in that, The hydrorefining reactor (4) is selected from at least one of a fixed-bed reactor, a fluidized-bed reactor, and a slurry-bed reactor.

9. The system according to any one of claims 1-4, characterized in that, The system also includes a dehydration and impurity removal tank (2), which is located between the waste lubricating oil raw material tank (1) and the hydrorefining reactor (4).

10. The system according to claim 9, characterized in that, The inlet of the dehydration and impurity removal tank (2) is connected to the outlet of the waste lubricating oil raw material tank (1); The outlet of the dehydration and impurity removal tank (2) is connected to the liquid phase inlet of the hydrorefining reactor (4).

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