Heat compensation device for low-carbon olefin and low-carbon aromatic hydrocarbon preparation system and low-carbon olefin and low-carbon aromatic hydrocarbon preparation system
By setting up heat exchangers and electric heaters in the low-carbon olefins and low-carbon aromatics preparation system, recycling the regenerated flue gas heat and electrically heating the main air, the problem of insufficient coke combustion heat is solved, and the heat balance and catalyst are achieved Conservation, reducing energy waste and carbon emissions.
Patent Information
- Application Number
- CN202310907902.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-21
- Publication Date
- 2025-01-21
AI Technical Summary
In the prior art, the heat generated by coke combustion in low-carbon olefins and low-carbon aromatic hydrocarbon preparation systems is insufficient, resulting in unbalanced heat of the reaction-regeneration system, and the dispersed combustion of fuel oil may lead to catalyst breakage and inactivation, and the heat of regenerated flue gas is not It can be effectively utilized and causes waste of energy.
By setting up a heat exchanger to recover and utilize the heat of the regeneration flue gas discharged from the catalyst regenerator, the air source is initially heated, and an electric heater, temperature sensor and controller are set up outside the catalyst regenerator, and the main air is heated using electric heating. Secondary heating ensures heat balance during the reaction while avoiding direct action on the catalyst to protect its performance.
It achieves efficient recovery and utilization of regeneration flue gas heat, ensures the heat balance of the reaction-regeneration system, reduces the risk of catalyst fragmentation and deactivation, reduces energy waste, reduces carbon emissions, and improves the environmental protection and environmental protection of the preparation process. Low carbon.
Smart Images
Figure CN119327358A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of catalytic conversion of hydrocarbon oil, and in particular, to a supplementary heat device for a light olefin and light aromatic hydrocarbon production system and a light olefin and light aromatic hydrocarbon production system. Background Art
[0002] As important basic organic raw materials for petrochemical industry, low-carbon olefins (ethylene, propylene) and low-carbon aromatics (BTX) play a vital role in the petrochemical industry.
[0003] Catalytic cracking of light hydrocarbons, catalytic cracking of light oils, catalytic conversion of light hydrocarbon oils, dehydrogenation of light alkanes, oxidative dehydrogenation of light alkanes, methanol to olefins, methanol to aromatics and other processes are important production processes for producing light olefins and light aromatics, with the characteristics of wide adaptability of raw materials, large operational flexibility and significant economic benefits. However, unlike the conventional heavy oil catalytic cracking and heavy oil catalytic cracking family processes, the coke yield of these reactions is low, and the heat generated by the combustion of coke is not enough to support the heat balance of the entire reaction-regeneration system, even if a raw material heating furnace is set up, it is not enough to support the heat required for the reaction.
[0004] In the prior art, in order to solve the problem of insufficient heat caused by insufficient coke production from cracking of light hydrocarbon oil, one method is to set up a supplementary heater next to the catalyst regenerator, and connect it to the catalyst regenerator through a catalyst delivery pipeline to form a loop, and set up a fuel distributor and a fluidized and pre-combustion medium distributor inside the supplementary heater, so that the injection of external supplementary fuel oil and complete combustion are in different environments respectively, and the main processes in the supplementary heater are fuel mixing, homogenization and pre-combustion. After forming uniform additional coke, it is sent to the regenerator through a pipeline and a control slide valve for complete combustion and heat release. The process is continuous, the combustion is stable and mild, and the surface temperature rise of the catalyst particles is uniform, which can protect the physical properties and chemical activity of the catalyst. However, this method requires the combustion oil to enter the supplementary heater and disperse in the catalyst before entering the regenerator for combustion. In this process, since the combustion oil is more dispersed, it may cause a larger range of catalyst fragmentation and deactivation. In addition, the prior art does not make reasonable use of the regenerated flue gas discharged by the regenerator, resulting in energy waste. Summary of the invention
[0005] The purpose of the present disclosure is to provide a heat supplement device for a low-carbon olefin and low-carbon aromatic hydrocarbon production system and a low-carbon olefin and low-carbon aromatic hydrocarbon production system, wherein the heat supplement device reasonably utilizes the heat of the regenerated flue gas without affecting the catalyst.
[0006] In order to achieve the above-mentioned purpose, the present disclosure provides a heat supplement device for a low-carbon olefin and low-carbon aromatic hydrocarbon preparation system, the low-carbon olefin and low-carbon aromatic hydrocarbon preparation system includes a catalyst regenerator, and the heat supplement device includes: an air source; a heat exchanger, the heat exchanger having a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, the first medium inlet is connected to the air source, and the second medium inlet is used to be connected to the regeneration flue gas outlet of the catalyst regenerator; an electric heater, the inlet of the electric heater is connected to the first medium outlet, and the outlet of the electric heater is used to be connected to the main air inlet of the catalyst regenerator; a temperature sensor, which is arranged between the outlet of the electric heater and the main air inlet; and a controller, the controller is respectively communicated with the temperature sensor and the electric heater, so that the controller adjusts the working power of the electric heater according to the temperature signal emitted by the temperature sensor.
[0007] Optionally, the heat exchanger includes a plurality of heat exchangers, and the plurality of heat exchangers are connected in series. Among two adjacent heat exchangers, the first medium outlet of the heat exchanger close to the wind source is connected to the first medium inlet of the heat exchanger far from the wind source, and the second medium inlet of the heat exchanger close to the wind source is connected to the second medium outlet of the heat exchanger far from the wind source.
[0008] Optionally, the heat supplement device further includes a waste heat recovery device, and the waste heat recovery device is connected to the second medium outlet.
[0009] Optionally, the electric heater comprises a plurality of electric heaters, and the plurality of electric heaters are connected in parallel and / or in series.
[0010] Optionally, the heat supplement device further includes a side wind channel, one end of which is connected to the first medium outlet, and the other end of which is arranged between the outlet of the electric heater and the temperature sensor.
[0011] Optionally, a control valve is provided in the side wind channel, and the control valve is communicatively connected to the controller.
[0012] On the basis of the above technical scheme, the present disclosure also provides a system for preparing low-carbon olefins and low-carbon aromatics, which comprises a reactor, a catalyst regenerator, a steam device and the above-mentioned supplementary heat device, wherein the reactor is provided with a reaction oil and gas outlet, a catalyst outlet to be regenerated and a reaction raw material inlet in sequence from top to bottom, and a regenerated catalyst inlet and a steam inlet are provided at the bottom of the reactor; the catalyst regenerator is provided with a regenerated flue gas outlet, a regenerated catalyst outlet, a catalyst inlet to be regenerated and a main air inlet in sequence from top to bottom, the catalyst inlet to be regenerated is connected to the catalyst outlet to be regenerated, the regenerated catalyst outlet is connected to the regenerated catalyst inlet, and the regenerated flue gas outlet is connected to the second medium inlet; the steam device comprises a steam outlet, which is selectively connected to the inlet of the electric heater or the steam inlet; the inlet of the electric heater is selectively connected to the first medium outlet, and the outlet of the electric heater is selectively connected to the steam inlet or the main air inlet.
[0013] Optionally, the temperature sensor is arranged between the steam inlet and the outlet of the electric heater.
[0014] Optionally, the electric heater comprises a plurality of electric heaters which are arranged in parallel, the inlet of at least one electric heater can be selectively connected to the first medium outlet or the steam outlet, and the outlet of the electric heater can be selectively connected to the main air inlet or the steam inlet.
[0015] Optionally, a main air distributor is provided at the bottom of the catalyst regenerator, and the main air distributor covers the main air inlet, so that the main air enters the catalyst regenerator through the main air distributor.
[0016] Optionally, the main air distributor is constructed as a tree-like distribution pipe, a distribution ring or a distribution nozzle.
[0017] Optionally, the controller is communicatively connected with the catalyst regenerator, the reactor and / or the steam device, so that the controller controls the electric heater to shut down when a failure occurs in the catalyst regenerator, the reactor and / or the steam device.
[0018] Through the above technical scheme, in the heat supplement device for the low-carbon olefin and low-carbon aromatic preparation system provided by the present disclosure, firstly, a heat exchanger is set to recycle the heat of the regenerated flue gas discharged from the catalyst regenerator to preliminarily heat the wind source, and then the electric heater, temperature sensor and controller set outside the catalyst regenerator are combined to use electric heating to perform secondary heating on the main wind required by the catalyst regenerator to meet the heating demand of the main wind, so that when these main winds are introduced into the catalyst regenerator, the insufficient heat generated by the combustion of coke during the reaction of the low-carbon olefin and low-carbon aromatic preparation system can be supplemented, thereby maintaining the heat balance of the entire reaction-regeneration system. In the above process, not only the heat of the regenerated flue gas is recycled to achieve efficient use of energy, but also because the heating of the main wind required for catalyst regeneration does not directly act on the catalyst, and thus will not affect the performance of the catalyst. In addition, since the present invention adopts electric heating to solve the problem of insufficient heat generated by coke combustion, there is no need to spray fuel oil into the catalyst regenerator or the supplementary heat device. In this way, there is no need to add additional oxygen to burn fuel oil during the preparation of low-carbon olefins and low-carbon aromatics. Therefore, the main air consumption can be reduced and the main fan load at the wind source can be reduced. At the same time, since the combustion of fuel oil will produce carbon dioxide and thus lead to an increase in carbon emissions, the supplementary heat device of the present invention does not need to use fuel oil. Therefore, the use of the supplementary heat device of the present invention is also more environmentally friendly and low-carbon.
[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0021] Figure 1 It is a structural schematic diagram of the light olefin and light aromatic preparation system disclosed in the present invention.
[0022] Description of Reference Numerals
[0023] 1-wind source; 2-electric heater; 21-inlet of electric heater; 22-outlet of electric heater; 3-temperature sensor; 4-controller; 5-catalyst regenerator; 51-main air inlet; 52-regenerated flue gas outlet; 53-regenerated catalyst outlet; 54-inlet of catalyst to be regenerated; 6-side wind channel; 7-reactor; 71-reaction oil and gas outlet; 72-outlet of catalyst to be regenerated; 73-reaction raw material inlet; 74-regenerated catalyst inlet; 75-steam inlet; 8-steam device; 81-steam outlet; 9-main air distributor; 10-heat exchanger; 101-first medium inlet; 102-first medium outlet; 103-second medium inlet; 104-second medium outlet; 11-waste heat recovery device. DETAILED DESCRIPTION
[0024] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0025] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own contour. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.
[0026] The present invention provides a heat supplement device for a low-carbon olefin and low-carbon aromatic preparation system, referring to Figure 1 As shown, the low-carbon olefin and low-carbon aromatic preparation system includes a catalyst regenerator 5, and the heat supplement device includes: a wind source 1; a heat exchanger 10, the heat exchanger 10 has a first medium inlet 101, a first medium outlet 102, a second medium inlet 103 and a second medium outlet 104, the first medium inlet 101 is connected to the wind source 1, and the second medium inlet 103 is used to communicate with the regeneration flue gas outlet 52 of the catalyst regenerator 5; an electric heater 2, the inlet 21 of the electric heater is connected to the first medium outlet 102, and the outlet 22 of the electric heater is used to communicate with the main air inlet 51 of the catalyst regenerator 5; a temperature sensor 3, which is used to be arranged between the outlet 22 of the electric heater and the main air inlet 51; and a controller 4, the controller 4 is respectively connected to the temperature sensor 3 and the electric heater 2 in communication, so that the controller 4 adjusts the working power of the electric heater 2 according to the temperature signal sent by the temperature sensor 3.
[0027] Through the above technical scheme, in the heat supplement device for the low-carbon olefin and low-carbon aromatic preparation system provided by the present disclosure, firstly, the heat of the regenerated flue gas discharged from the catalyst regenerator 5 is recovered and utilized by setting a heat exchanger 10 to preliminarily heat the wind source 1, and then the electric heater 2, temperature sensor 3 and controller 4 arranged outside the catalyst regenerator 5 are combined to adopt electric heating to perform secondary heating on the main wind required by the catalyst regenerator 5 to meet the heating demand of the main wind, so that when these main winds are introduced into the catalyst regenerator 5, the insufficient heat generated by the combustion of coke during the reaction of the low-carbon olefin and low-carbon aromatic preparation system can be supplemented, thereby maintaining the heat balance of the entire reaction-regeneration system. In the above process, not only the heat of the regenerated flue gas is recovered and utilized to achieve efficient energy utilization, but also because the heating of the main wind required for catalyst regeneration does not directly act on the catalyst, it will not affect the performance of the catalyst. In addition, since the present invention adopts electric heating to solve the problem of insufficient heat generated by the combustion of coke, there is no need to spray fuel oil into the catalyst regenerator 5 or the supplementary heat device. In this way, there is no need to add additional oxygen to burn the fuel oil during the preparation of low-carbon olefins and low-carbon aromatics. Therefore, the main air consumption can be reduced, and the load of the main fan (not shown in the figure) at the wind source 1 can be reduced. At the same time, since the combustion of fuel oil will produce carbon dioxide and thus lead to an increase in carbon emissions, the supplementary heat device of the present invention does not need to use fuel oil. Therefore, the use of the supplementary heat device of the present invention is also more environmentally friendly and low-carbon.
[0028] In the embodiment provided in the present disclosure, the heat exchanger 10 includes a plurality of heat exchangers 10, and the plurality of heat exchangers 10 are connected in series. In two adjacent heat exchangers 10, the first medium outlet 102 of the heat exchanger 10 close to the wind source 1 is connected to the first medium inlet 101 of the heat exchanger 10 far from the wind source 1, and the second medium inlet 103 of the heat exchanger 10 close to the wind source 1 is connected to the second medium outlet 104 of the heat exchanger 10 far from the wind source 1. In this way, by setting a plurality of heat exchangers 10 in series, on the one hand, the main air temperature preliminarily heated by the heat exchanger 10 can be increased, and on the other hand, the manufacturing and installation difficulties caused by the excessive length of the structure when a single heat exchanger 10 is used can be avoided. Here, the number of heat exchangers 10 can be two, three or four, etc., which can be flexibly selected according to actual conditions, and the present disclosure does not make specific restrictions on this.
[0029] In the embodiment provided in the present disclosure, in order to further fully recover the heat of the regeneration flue gas discharged from the catalyst regenerator 5, the heat supplement device of the present disclosure further includes a waste heat recovery device 11, and the waste heat recovery device 11 is connected to the second medium outlet 104. Exemplarily, the heat recovered by the waste heat recovery device 11 can be used to heat deoxygenated water, hot water or desalted water, etc., which can be flexibly selected according to actual conditions, and the present disclosure does not limit this.
[0030] In the embodiment provided in the present disclosure, the electric heater 2 includes multiple electric heaters, and the multiple electric heaters 2 can be implemented in at least the following three possible ways:
[0031] In a first possible implementation manner, a plurality of electric heaters 2 are connected in parallel.
[0032] In a second possible implementation, a plurality of electric heaters 2 are connected in series.
[0033] In a third possible implementation, the connection mode between the multiple electric heaters 2 includes both a series connection mode and a parallel connection mode.
[0034] Among the three possible implementations mentioned above, the series connection can heat the main air to a higher temperature, but the pressure drop is higher, resulting in an increase in the outlet pressure of the wind source 1 and thus increasing the power consumption of the main fan at the wind source 1; while the parallel connection can heat more main air with a lower pressure drop, but the main air temperature at the outlet 22 of the electric heater may not meet the requirements. Therefore, in actual use, it is necessary to determine whether multiple electric heaters 2 are connected in series or in parallel, or even both at the same time, based on the amount of main air required by the supplementary heat device and the heating temperature required for the main air.
[0035] In the embodiment provided by the present disclosure, in order to be able to more flexibly adjust the main air temperature required by the catalyst regenerator 5, the supplementary heat device of the present disclosure can be set to also include a side wind channel 6, one end of the side wind channel 6 is connected to the first medium outlet 102, and the other end is arranged between the outlet 22 of the electric heater and the temperature sensor 3, so that a part of the main air preliminarily heated by the heat exchanger 10 can enter the electric heater 2 for secondary heating, and the other part can bypass the electric heater 2 and directly enter the side wind channel 6, so that the temperature of the main air entering the catalyst regenerator 5 can be adjusted by controlling the working power of the electric heater 2 by the controller 4 on the one hand, and can also be adjusted by the air volume entering the side wind channel 6 on the other hand. Here, setting the other end of the side wind channel 6 between the outlet 22 of the electric heater and the temperature sensor 3 is conducive to the controller 4 to control the working power of the electric heater 2 based on the influence of the side wind channel 6 on the main air temperature, so as to be more conducive to adjusting the main air finally entering the catalyst regenerator 5 to a suitable temperature.
[0036] In order to facilitate flexible control of the air volume in the side wind channel 6 through the controller 4 , a control valve may be provided in the side wind channel 6 , and the control valve is communicatively connected with the controller 4 .
[0037] Based on the above technical solution, the present disclosure also provides a system for preparing low-carbon olefins and low-carbon aromatics, referring to Figure 1As shown, the system for preparing low-carbon olefins and low-carbon aromatics includes a reactor 7, a catalyst regenerator 5, a steam device 8 and the above-mentioned supplementary heat device. The reactor 7 is provided with a reaction oil and gas outlet 71, a catalyst outlet 72 to be regenerated and a reaction raw material inlet 73 from top to bottom, and a regenerated catalyst inlet 74 and a steam inlet 75 are provided at the bottom of the reactor 7; the catalyst regenerator 5 is provided with a regenerated flue gas outlet 52, a regenerated catalyst outlet 53, a catalyst inlet 54 to be regenerated and a main air inlet 51 from top to bottom, the catalyst inlet 54 to be regenerated is connected to the catalyst outlet 72 to be regenerated, the regenerated catalyst outlet 53 is connected to the regenerated catalyst inlet 74, and the regenerated flue gas outlet 52 is connected to the second medium inlet 103; the steam device 8 includes a steam outlet 81, and the steam outlet 81 can be selectively connected to the inlet 21 of the electric heater or the steam inlet 75; the inlet 21 of the electric heater can be selectively connected to the first medium outlet 102, and the outlet 22 of the electric heater can be selectively connected to the steam inlet 75 or the main air inlet 51.
[0038] Through the above technical scheme, in the low-carbon olefin and low-carbon aromatic preparation system provided by the present disclosure, by making the steam outlet 81 of the steam device 8 selectively connected to the inlet 21 of the electric heater or the steam inlet 75 of the reactor 7, and the inlet 21 of the electric heater selectively connected to the first medium outlet 102, and the outlet 22 of the electric heater selectively connected to the steam inlet 75 or the main air inlet 51, it is achieved that during the start-up phase, by switching the inlet 21 of the electric heater to be connected to the steam outlet 81 of the steam device 8, and switching the outlet 22 of the electric heater to be connected to the steam inlet 75 of the reactor 7, the electric heater 2 is used to heat the steam required by the reactor 7 during the start-up phase, so as to achieve To increase the temperature of the reactor 7, to avoid the problem of catalyst "mud" caused by steam condensation due to the low temperature of the reactor 7 when the catalyst regenerator 5 and the reactor 7 are converted; and when entering the normal working stage later, the steam outlet 81 of the steam device 8 is switched again to be connected with the steam inlet 75 of the reactor 7, and at the same time, the inlet 21 of the electric heater is switched to be connected with the first medium outlet 102, and the outlet 22 of the electric heater is connected with the main air inlet 51 of the catalyst regenerator 5. This can use the electric heater 2 to heat the main air required by the catalyst regenerator 5 in the normal working stage, thereby supplementing the insufficient heat generated by the combustion of coke during the reaction process, and finally maintaining the heat balance of the entire reaction-regeneration system. Therefore, the electric heater 2 in the present disclosure can not only meet the supplement of the heat required by the catalyst regenerator 5 during the normal working process, but also take into account the heating of the steam required by the reactor 7 during the start-up process.
[0039] In the embodiment provided in the present disclosure, the temperature sensor 3 is arranged between the steam inlet 75 and the outlet 22 of the electric heater, so that the temperature sensor 3 can not only monitor and adjust the temperature of the main air required by the catalyst regenerator 5 in the normal working stage, but also monitor and adjust the temperature of the steam required by the reactor 7 in the start-up stage.
[0040] In the embodiment provided in the present disclosure, the electric heater 2 includes a plurality of electric heaters 2 which are arranged in parallel, and the inlet 21 of at least one electric heater can be selectively connected to the first medium outlet 102 or the steam outlet 81, and the outlet 22 of the electric heater can be selectively connected to the main air inlet 51 or the steam inlet 75. In this way, it can not only ensure the heating of the main air temperature required for the catalyst regenerator 5 in the normal working stage, but also take into account the heating of the startup steam required for the reactor 7 in the startup stage, thereby increasing the temperature of the reactor 7 and avoiding the problem of catalyst "mud" caused by steam condensation due to excessively low temperature of the reactor 7 when the catalyst regenerator 5 and the reactor 7 are converted.
[0041] In the embodiment provided by the present disclosure, in order to ensure that the main wind can be evenly distributed in the cross section of the catalyst regenerator 5, thereby ensuring the catalyst regeneration effect, a main wind distributor 9 can be provided at the bottom of the catalyst regenerator 5, and the main wind distributor 9 covers the main wind inlet 51, so that the main wind enters the catalyst regenerator 5 through the main wind distributor 9. Among them, the main wind distributor 9 can be configured as a dendrite distribution pipe, a distribution ring or a distribution nozzle, and can also be configured as any other suitable shape, which is based on the ability to achieve the inventive purpose of the present disclosure, and the present disclosure does not limit this.
[0042] In the embodiments provided in the present disclosure, in order to facilitate flexible control of the entire preparation system, the connection between the controller 4 and the catalyst regenerator 5, the reactor 7 and the steam device 8 can be implemented in at least the following ways:
[0043] In a first possible implementation, the controller 4 is connected in communication with the catalyst regenerator 5 so that the controller 4 controls the electric heater 2 to shut down when a failure occurs in the catalyst regenerator 5 .
[0044] In a second possible implementation, the controller 4 is connected to the reactor 7 for communication, so that the controller 4 controls the electric heater 2 to shut down when a fault occurs in the reactor 7 .
[0045] In a third possible implementation, the controller 4 is in communication connection with the steam device 8, so that the controller 4 controls the electric heater 2 to shut down when a fault occurs in the steam device 8.
[0046] In a fourth possible implementation, the controller 4 is respectively connected to the catalyst regenerator 5 and the reactor 7 for communication, so that the controller 4 controls the electric heater 2 to shut down when at least one of the catalyst regenerator 5 and the reactor 7 fails.
[0047] In a fifth possible implementation, the controller 4 is respectively connected to the catalyst regenerator 5 and the steam device 8 for communication, so that the controller 4 controls the electric heater 2 to shut down when at least one of the catalyst regenerator 5 and the steam device 8 fails.
[0048] In a sixth possible implementation, the controller 4 is respectively connected to the reactor 7 and the steam device 8 for communication, so that the controller 4 controls the electric heater 2 to shut down when at least one of the reactor 7 and the steam device 8 fails.
[0049] In a seventh possible implementation, the controller 4 is respectively connected to the catalyst regenerator 5, the reactor 7 and the steam device 8 for communication, so that the controller 4 controls the electric heater 2 to shut down when at least one of the catalyst regenerator 5, the reactor 7 and the steam device 8 fails.
[0050] In the above seven possible implementation methods, the controller 4 is respectively connected to the catalyst regenerator 5, the reactor 7 and the steam device 8 for communication, so that the controller 4 controls the electric heater 2 to cut off the operation when any one of the catalyst regenerator 5, the reactor 7 and the steam device 8 fails, thereby protecting the entire preparation system.
[0051] It should be noted that when the electric heater 2 in the present disclosure is used to heat the main wind, after comprehensively considering the heat balance requirements and economic costs, the main wind temperature at the outlet 22 of the electric heater can be set to 200°C-1500°C, preferably 400°C-1000°C, more preferably 500°C-800°C, and the pressure drop of the electric heater 2 is set to 0.5-100kPa, preferably 1-50kPa, more preferably 3-20kPa, so as to ensure uniform distribution of the main wind. Exemplarily, the main wind temperature at the outlet 22 of the electric heater can be 200°C, 400°C, 600°C, 800°C, 1000°C, 1200°C or 1500°C, or any temperature between these values, which is not limited in the present disclosure. In addition, the pressure drop of the electric heater 2 can be 0.5kPa, 10kPa, 20kPa, 30kPa, 40kPa, 50kPa, 60kPa, 70kPa, 80kPa, 90kPa or 100kPa, or any pressure drop between these values, which is not limited in the present disclosure.
[0052] In addition, according to the reaction pressure, the pressure of the main wind from the wind source 1 can be set to 0.01-1.0MPa(g), preferably 0.1-0.4MPa(g), and more preferably 0.12-0.28MPa(g). Exemplarily, the main wind pressure from the wind source 1 can be 0.01MPa(g), 0.1MPa(g), 0.2MPa(g), 0.3MPa(g), 0.4MPa(g), 0.5MPa(g), 0.6MPa(g), 0.7MPa(g), 0.8MPa(g), 0.9MPa(g) or 1.0MPa(g), or any pressure between these values, which is not limited in the present disclosure.
[0053] In addition, the heat supplement device and preparation system disclosed in the present invention are applicable to all reaction-regeneration processes in which the combustion heat of self-produced coke is insufficient, including but not limited to catalytic cracking of light hydrocarbons, catalytic cracking of light oils, catalytic conversion of light hydrocarbon oils, dehydrogenation of low-carbon alkanes, oxidative dehydrogenation of low-carbon alkanes, methanol to olefins, methanol to aromatics, etc. And the main wind can be air or a combination of oxygen and protective gas, such as oxygen and nitrogen, oxygen and carbon dioxide, etc., or other gases that can achieve the invention purpose of the present invention, which is not limited by the present invention.
[0054] It should also be noted that the optional connection in the present disclosure can be achieved through a valve.
[0055] The following is an introduction to the heat supplement device in the preparation system of the present disclosure in conjunction with specific embodiments:
[0056] Taking the catalytic cracking of 600,000 tons / year of light hydrocarbon oil as an example, Figure 1 The supplementary heat device in the preparation system shown in the figure includes two heat exchangers 10 and four electric heaters 2. The wind source 1 first enters the first heat exchanger 10 to exchange heat with the regenerated flue gas to 350°C, then enters the second heat exchanger 10 to continue to exchange heat with the regenerated flue gas to 550°C, and then all enters the four parallel electric heaters 2 for secondary heating. The high-temperature main air obtained after the secondary heating enters the catalyst regenerator 5 to participate in combustion. The main operating conditions are as follows:
[0057] The main wind pressure from wind source 1 is 0.16MPa(g);
[0058] The main air temperature from wind source 1 is 180°C;
[0059] The main air temperature after being heated by the first heat exchanger 10 is 350°C;
[0060] The main air temperature after being heated by the second heat exchanger 10 is 550°C;
[0061] The main air temperature at the outlet 22 of the electric heater is 750°C-800°C;
[0062] The pressure drop of the electric heater 2 is 5-10 kPa.
[0063] During operation, the load of the electric heater 2 was flexibly adjusted according to the heat required by the entire low-carbon olefin and low-carbon aromatic preparation system. It was found that the catalyst breakage and deactivation were significantly reduced, the catalyst consumption was significantly reduced, and the reaction effect was significantly improved.
[0064] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0066] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A heat supplement device for a light olefin and light aromatic hydrocarbon production system, the light olefin and light aromatic hydrocarbon production system comprising a catalyst regenerator, characterized in that: The heat supplement device comprises: Wind source; A heat exchanger, wherein the heat exchanger has a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, wherein the first medium inlet is connected to the wind source, and the second medium inlet is used to be connected to the regeneration flue gas outlet of the catalyst regenerator; an electric heater, wherein the inlet of the electric heater is connected to the first medium outlet, and the outlet of the electric heater is used to be connected to the main air inlet of the catalyst regenerator; a temperature sensor, arranged between the outlet of the electric heater and the main air inlet; and A controller is respectively connected to the temperature sensor and the electric heater for communication, so that the controller adjusts the working power of the electric heater according to the temperature signal sent by the temperature sensor.
2. The heat supplement device according to claim 1, characterized in that: The heat exchangers include a plurality of heat exchangers, which are connected in series. Among two adjacent heat exchangers, the first medium outlet of the heat exchanger close to the wind source is connected to the first medium inlet of the heat exchanger far from the wind source, and the second medium inlet of the heat exchanger close to the wind source is connected to the second medium outlet of the heat exchanger far from the wind source.
3. The supplementary heat device according to claim 1, characterized in that: The heat supplement device further includes a waste heat recovery device, and the waste heat recovery device is communicated with the second medium outlet.
4. The supplementary heat device according to claim 1, characterized in that: The electric heaters include a plurality of heaters, and the plurality of electric heaters are connected in parallel and / or in series.
5. The supplementary heat device according to claim 1, characterized in that: The supplementary heat device further comprises a side wind channel, one end of which is communicated with the first medium outlet, and the other end of which is arranged between the outlet of the electric heater and the temperature sensor.
6. The supplementary heat device according to claim 5, characterized in that: A control valve is provided in the side wind channel, and the control valve is communicatively connected with the controller.
7. A system for preparing low-carbon olefins and low-carbon aromatics, characterized in that: The light olefin and light aromatic preparation system comprises a reactor, a catalyst regenerator, a steam device and a supplementary heat device according to any one of claims 1 to 6, The reactor is provided with a reaction oil and gas outlet, a catalyst outlet to be regenerated, and a reaction raw material inlet in order from top to bottom, and a regenerated catalyst inlet and a steam inlet are provided at the bottom of the reactor; The catalyst regenerator is provided with a regenerated flue gas outlet, a regenerated catalyst outlet, a catalyst inlet to be regenerated, and a main air inlet in order from top to bottom, the catalyst inlet to be regenerated is connected with the catalyst outlet to be regenerated, the regenerated catalyst outlet is connected with the regenerated catalyst inlet, and the regenerated flue gas outlet is connected with the second medium inlet; The steam device comprises a steam outlet, which is selectively connected to the inlet of the electric heater or the steam inlet; The inlet of the electric heater may be selectively communicated with the first medium outlet, and the outlet of the electric heater may be selectively communicated with the steam inlet or the main air inlet.
8. The system for preparing light olefins and light aromatics according to claim 7, characterized in that: The temperature sensor is disposed between the steam inlet and an outlet of the electric heater.
9. The system for preparing light olefins and light aromatics according to claim 7, characterized in that: The electric heaters include a plurality of electric heaters which are arranged in parallel, an inlet of at least one of the electric heaters being selectively connected to the first medium outlet or the steam outlet, and an outlet of the electric heater being selectively connected to the main air inlet or the steam inlet.
10. The system for preparing light olefins and light aromatics according to claim 7, characterized in that: A main air distributor is arranged at the bottom of the catalyst regenerator, and the main air distributor covers the main air inlet, so that the main air enters the catalyst regenerator through the main air distributor.
11. The system for preparing light olefins and light aromatics according to claim 10, characterized in that: The main air distributor is constructed as a tree-like distribution pipe, a distribution ring or a distribution nozzle.
12. The system for preparing light olefins and light aromatics according to any one of claims 7 to 11, characterized in that: The controller is in communication connection with the catalyst regenerator, the reactor and / or the steam device, so that the controller controls the electric heater to shut down when a failure occurs in the catalyst regenerator, the reactor and / or the steam device.