Catalyst replacement method, device, apparatus, and computer-readable storage medium

Abstract

Embodiments of the present disclosure provide a catalyst replacement method, device, equipment and computer readable storage medium. The method comprises: monitoring a current performance index of solvent oil generated by a hydrogenation stabilization device; obtaining a preset correspondence between the performance index of the solvent oil and an economic index of a coal liquefaction device upstream of the hydrogenation stabilization device; determining a current economic index of the coal liquefaction device according to the current performance index and the preset correspondence; and replacing a catalyst in the hydrogenation stabilization device if the current economic index matches a minimum economic index. In this way, the performance index of the product of the hydrogenation stabilization device itself and the coal liquefaction device upstream of the hydrogenation stabilization device can be combined to select a reasonable replacement amount of the catalyst at a suitable time, so as to ensure the efficiency and accuracy of catalyst replacement and improve the quality of the product of the hydrogenation stabilization device.

Description

Technical Field

[0001] This disclosure relates to the chemical industry, and in particular to the field of catalyst replacement technology. Background Technology

[0002] The coal direct liquefaction solvent oil hydrogenation stabilization unit employs fluidized bed technology. A certain amount of hydrogenation stabilization catalyst is added to the reactor at once. Due to metal deposition, wear and breakage, coking, and carbon buildup, the activity of the catalyst gradually decreases, adversely affecting product performance. To maintain constant catalyst activity, a certain amount of old catalyst needs to be periodically removed from the reactor, while a certain amount of new catalyst is added—a process known as "catalyst replacement." However, currently, the timing and amount of catalyst replacement are based on human experience, thus the efficiency and accuracy of catalyst replacement cannot be guaranteed.

[0003] Public content

[0004] This disclosure provides a catalyst replacement method, apparatus, device, and storage medium.

[0005] According to a first aspect of this disclosure, a catalyst replacement method is provided. The method includes:

[0006] Monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit;

[0007] Obtain a pre-generated correspondence between the performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit;

[0008] Based on the current performance indicators and the preset correspondence, the current economic indicators of the coal liquefaction unit are determined;

[0009] If the current economic indicators match the minimum economic indicators, then the catalyst in the hydrogenation stabilization unit is replaced.

[0010] In addition to the aspects and any possible implementations described above, an implementation is further provided in which the replacement of the catalyst in the hydrogenation stabilization unit if the current economic indicator matches the minimum economic indicator includes:

[0011] If the absolute value of the first difference between the current economic indicator and the minimum economic indicator is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, then it is confirmed that the current economic indicator and the minimum economic indicator are matched.

[0012] When matched, the catalyst in the hydrogenation stabilization unit is replaced.

[0013] As described above and in any possible implementation, a further implementation is provided in which the replacement of the catalyst in the hydrogenation stabilization unit comprises:

[0014] Calculate the time consumed from when the absolute value of the first difference is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, to when the absolute value of the second difference between the current performance indicator and the target performance indicator is less than a preset performance threshold and the current performance indicator is greater than the target performance indicator;

[0015] Obtain the preset initial replacement rate of the catalyst and the preset increase in the replacement rate of the catalyst;

[0016] The amount of catalyst replaced is calculated based on the preset initial replacement rate, the preset increase, and the duration.

[0017] The catalyst in the hydrogenation stabilization unit is replaced according to the stated replacement amount.

[0018] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the step of generating the preset correspondence includes:

[0019] The historical performance indicators of the solvent oil and the corresponding historical economic indicators of the coal liquefaction unit at each time point are obtained; wherein, the process conditions of the hydrogenation stabilization unit are consistent at each time point;

[0020] The historical performance indicators and corresponding historical economic indicators are used to perform linear fitting to obtain the preset correspondence.

[0021] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the process conditions of the hydrogenation stabilization unit are consistent at each time point, including:

[0022] At each time point, the reaction temperature, reaction pressure, and space velocity of the hydrogenation stabilization unit are maintained at their respective target values.

[0023] In addition to the aspects and any possible implementations described above, an implementation is further provided in which the performance indicators of the solvent oil include at least one of the following: the refractive index of the solvent oil, the monocyclic aromatic hydrocarbon content of the solvent oil, the bicyclic aromatic hydrocarbon content of the solvent oil, the hydrogen donation index of the solvent oil, the total aromatic hydrocarbon content of the solvent oil, and the density of the solvent oil.

[0024] The economic indicators of the coal liquefaction unit include at least one of the following: coal powder conversion rate, reaction temperature, oil yield, gas yield, and ash content in asphalt.

[0025] According to a second aspect of this disclosure, a catalyst replacement device is provided. The device includes:

[0026] The monitoring module is used to monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit;

[0027] The acquisition module is used to acquire a preset correspondence between the pre-generated performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit;

[0028] The determination module is used to determine the current economic indicators of the coal liquefaction unit based on the current performance indicators and the preset correspondence.

[0029] The replacement module is used to replace the catalyst in the hydrogenation stabilization unit if the current economic index matches the minimum economic index.

[0030] According to a third aspect of this disclosure, an electronic device is provided. The electronic device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the program to implement the method described above.

[0031] According to a fourth aspect of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the method according to a first aspect of this disclosure.

[0032] In this disclosure, after monitoring the current performance indicators of the solvent oil generated by the hydrostabilization unit, the current economic indicators can be accurately calculated based on the preset correspondence between the performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit. Then, the current economic indicators are matched with the minimum economic indicators. By combining the performance indicators of the upstream coal liquefaction unit and the products of the hydrostabilization unit itself, the amount of catalyst can be reasonably replaced at an appropriate time to ensure the catalyst replacement efficiency and accuracy, and improve the quality of the products of the hydrostabilization unit.

[0033] It should be understood that the content described in this disclosure section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0034] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. The drawings are provided for a better understanding of the invention and are not intended to limit the scope of this disclosure. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0035] Figure 1A flowchart of a catalyst replacement method according to an embodiment of the present disclosure is shown;

[0036] Figure 2 A block diagram of a catalyst replacement apparatus according to an embodiment of the present disclosure is shown;

[0037] Figure 3 A block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0039] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] Figure 1 A flowchart of a catalyst replacement method 100 according to an embodiment of the present disclosure is shown. Method 100 may include:

[0041] Step 110: Monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit;

[0042] In a hydrostabilization unit, the reactants are hydrogen and coal liquefaction oil, and the products are solvent oil and naphtha. In other words, the hydrostabilization unit is a device where hydrogen and coal liquefaction oil undergo a chemical reaction to produce solvent oil and naphtha. Of course, in addition to the products, the final product of the hydrostabilization unit also includes a portion of modified feedstock, which is a distillate oil between solvent oil and naphtha.

[0043] Step 120: Obtain the preset correspondence between the pre-generated performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit;

[0044] The coal liquefaction oil unit is located upstream of the hydrogenation stabilization unit, providing the hydrogenation stabilization unit with raw material—coal liquefaction oil.

[0045] The performance indicators of the solvent oil include at least one of the following: the refractive index of the solvent oil, the content of monocyclic aromatic hydrocarbons of the solvent oil, the content of bicyclic aromatic hydrocarbons of the solvent oil, the total aromatic hydrocarbon content of the solvent oil, and the density of the solvent oil;

[0046] In a coal liquefaction unit, the reactants are pulverized coal and hydrogen, and the products are light hydrocarbon gases and coal liquefaction oil. The pulverized coal conversion rate is the ratio of the mass of light hydrocarbon gases and coal liquefaction oil minus the mass of hydrogen consumed in the chemical reaction to the mass of dry-basis ash-free pulverized coal in the pulverized coal, i.e., (mass of light hydrocarbon gases + mass of coal liquefaction oil - mass of hydrogen consumed in the chemical reaction) divided by (mass of dry-basis ash-free pulverized coal in the pulverized coal).

[0047] The economic indicators of the coal liquefaction unit include at least one of the following: coal powder conversion rate, reaction temperature, oil yield, gas yield, and ash content in asphalt.

[0048] This pre-defined correspondence includes, but is not limited to, the correspondence between the bicyclic aromatic hydrocarbon content of solvent oil and the coal powder conversion rate of coal liquefaction unit.

[0049] Step 130: Determine the current economic indicators of the coal liquefaction unit based on the current performance indicators and the preset correspondence;

[0050] Step 140: If the current economic indicator matches the minimum economic indicator, then replace the catalyst in the hydrogenation stabilization unit. The minimum economic indicator can be a coal powder conversion rate of 80% to 95%, for example, a coal powder conversion rate of 85%.

[0051] After monitoring the current performance indicators of the solvent oil generated by the hydrostabilization unit, the current economic indicators can be accurately calculated based on the preset correspondence between the performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit. Then, the current economic indicators are matched with the minimum economic indicators. By combining the performance indicators of the upstream coal liquefaction unit and the products of the hydrostabilization unit itself, the amount of catalyst can be reasonably replaced at an appropriate time to ensure the efficiency and accuracy of catalyst replacement and improve the quality of the products of the hydrostabilization unit.

[0052] In some embodiments, replacing the catalyst in the hydrogenation stabilization unit if the current economic indicator matches the minimum economic indicator includes:

[0053] If the absolute value of the first difference between the current economic indicator and the minimum economic indicator is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, then it is confirmed that the current economic indicator and the minimum economic indicator are matched.

[0054] When matched, the catalyst in the hydrogenation stabilization unit is replaced.

[0055] If the absolute value of the first difference between the current economic indicator and the minimum economic indicator is less than the preset indicator threshold and the current economic indicator is less than the minimum economic indicator, it indicates that the current economic indicator of the upstream unit is approaching the minimum economic indicator, and the current economic indicator matches the minimum economic indicator. Since the current economic indicator has been reduced to the lower limit of the economic indicator and cannot be reduced further, this is the most appropriate time to replace the catalyst. Therefore, the catalyst in the hydrogenation stabilization unit is replaced, thereby using fresh catalyst to accelerate the reaction and improve the current economic indicator.

[0056] In some embodiments, the replacement of the catalyst in the hydrogenation stabilization unit includes:

[0057] Calculate the time consumed from when the absolute value of the first difference is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator to when the absolute value of the second difference is less than a preset performance threshold and the current performance indicator is greater than the target performance indicator;

[0058] Obtain the preset initial replacement rate of the catalyst and the preset increase in the replacement rate of the catalyst;

[0059] The amount of catalyst replaced is calculated based on the preset initial replacement rate, the preset increase, and the duration.

[0060] The preset initial replacement rate f0 of the catalyst refers to the theoretically assumed proportion of the weight of the new catalyst added to the hydrogenation stabilization unit to the total weight of the catalyst in the hydrogenation stabilization unit. f0 can be any value greater than 0, with a preferred f0 of 0.1 to 2.5. The unit of f0 is ().

[0061] The preset increase z is the theoretically assumed increase in catalyst replacement rate at regular intervals (e.g., 1 day). z can be any value greater than 0, with a preferred z range of 0.01 to 2.5. The unit of z is %.

[0062] The catalyst in the hydrogenation stabilization unit is replaced according to the stated replacement amount. This replacement amount is the amount of catalyst replaced at regular intervals (e.g., every day or every two days).

[0063] Since the reaction accelerates after catalyst replacement, resulting in an increase in current performance and economic indicators, the time elapsed from the moment when the absolute value of the first difference is less than a preset threshold and the current economic indicator is less than the minimum economic indicator to the moment when the absolute value of the second difference is less than a preset performance threshold and the current performance indicator is greater than the target performance indicator can be calculated. Then, based on the preset initial replacement rate, the preset increase amount, and the time elapsed, the optimal replacement amount of the catalyst each time can be accurately calculated, thereby improving the catalyst replacement efficiency and accuracy, maximizing the optimization of the reaction and product quality of the hydrogenation stabilization unit, and the economic indicators of the upstream unit.

[0064] In some embodiments, the step of generating the preset correspondence includes:

[0065] The historical performance indicators of the solvent oil and the corresponding historical economic indicators of the coal liquefaction unit at each time point are obtained; wherein, the process conditions of the hydrogenation stabilization unit are consistent at each time point;

[0066] Each time point can be a daily event or a two-day event, such as the first day, the second day, the third day, etc.

[0067] The historical performance indicators and corresponding historical economic indicators are used to perform linear fitting to obtain the preset correspondence.

[0068] For solvent oil hydrotreating units, the most important function is to ensure the highest possible coal powder conversion rate and other economic indicators. The coal powder conversion rate is positively correlated with performance indicators such as the content of bicyclic aromatic hydrocarbons (BARHs) in the solvent oil; for example, the BARH content directly reflects the coal powder conversion rate. Under specific process conditions, the BARH content in the solvent oil is positively correlated with catalyst activity, meaning it decreases as catalyst activity decreases, and vice versa. Therefore, by obtaining the historical performance indicators of the solvent oil and the corresponding historical economic indicators of the coal liquefaction unit at various time points, a linear fit can be performed using these historical performance indicators and corresponding historical economic indicators to obtain a linear relationship between them, i.e., a pre-defined correspondence.

[0069] The process of obtaining the preset correspondence can be as follows:

[0070] 220 tons of catalyst were loaded into the fluidized bed reactor of the hydrogenation stabilization unit and operated for 200 hours under the conditions of reaction temperature of 378-385℃, reaction pressure of 13.0-13.5MPa, and space velocity of 1.5h-1. When the minimum economic index of coal powder conversion rate xn≤85.0%, catalyst replacement was started.

[0071] The content of bicyclic aromatic hydrocarbons in the solvent oil was analyzed on days 1, 3, 5, 7, and 9, and the coal powder conversion rate of the upstream unit was calculated. The data are shown in Table 1 below:

[0072] Table 1

[0073] project Day 1 Day 3 Day 5 Day 7 Day 9 Coal powder conversion rate / % 91.0 90.3 88.6 87.5 86.2 Bicyclic aromatic hydrocarbon content (w)% 26.0 25.5 25.1 24.6 23.4

[0074] Determine the relationship between the content of bicyclic aromatic hydrocarbons in solvent oil and the coal powder conversion rate (i.e., the pre-defined correspondence):

[0075] x = ɑ*w

[0076] In the formula: x is the content (%) of bicyclic aromatic hydrocarbons in the solvent oil;

[0077] w represents the coal powder conversion rate (%).

[0078] α is a coefficient with a value between 3.5 and 3.7; in this permutation, it is taken as 3.6. That is:

[0079] x = 3.6 * w.

[0080] In some embodiments, the process conditions of the hydrogenation stabilization unit are consistent at each time point, including:

[0081] At each time point, the reaction temperature, reaction pressure, and space velocity of the hydrogenation stabilization unit are maintained at their respective target values.

[0082] Preferably, the system operates for 200 hours under the following conditions: target reaction temperature of 378-385℃, target reaction pressure of 13.0-13.5MPa, and target space velocity of 1.5h⁻¹.

[0083] In some embodiments, the performance indicators of the solvent oil include at least one of the following: the refractive index of the solvent oil, the monocyclic aromatic hydrocarbon content of the solvent oil, the bicyclic aromatic hydrocarbon content of the solvent oil, the hydrogen donation index of the solvent oil, the total aromatic hydrocarbon content of the solvent oil, and the density of the solvent oil.

[0084] The economic indicators of the coal liquefaction unit include at least one of the following: coal powder conversion rate, reaction temperature, oil yield, gas yield, and ash content in asphalt.

[0085] The technical solution of this disclosure will be further explained below:

[0086] For solvent oil hydrogenation stabilization units, the most important function is to ensure the highest possible coal powder conversion rate. The coal powder conversion rate is positively correlated with the bicyclic aromatic hydrocarbon (BAR) content in the solvent oil; that is, the BAR content directly reflects the coal powder conversion rate. Under specific process conditions, the BAR content in the solvent oil is positively correlated with catalyst activity; that is, it decreases as catalyst activity decreases, and vice versa.

[0087] The technical solution disclosed herein mainly includes three parts: determining the correspondence between the content of bicyclic aromatic hydrocarbons in solvent oil and the conversion rate of pulverized coal, starting to replace the catalyst according to the set replacement rate, and determining the catalyst replacement time and replacement rate.

[0088] 1. Determine the correlation between the content of bicyclic aromatic hydrocarbons in the solvent oil and the coal powder conversion rate:

[0089] (1) Determine the initial process conditions: The minimum economic index of the upstream unit technical index coal powder conversion rate (in this disclosure, the upstream unit technical index refers to the coal powder conversion rate) is x%, the reaction temperature T0 in °C, the reaction pressure P0 in MPa, the space velocity u0 in h-1, and the target performance index w0% of the bicyclic aromatic hydrocarbon content in the solvent oil.

[0090] (2) After the hydrogenation stabilization unit has been running for t1 hours, the content of bicyclic aromatic hydrocarbons w1% in the solvent oil is analyzed under the initial process conditions, and the coal powder conversion rate x1% is recorded at this time.

[0091] (3) After the hydrogenation stabilization unit has been running for t2 hours, the content of bicyclic aromatic hydrocarbons w2% in the solvent oil is analyzed under the initial process conditions, and the coal powder conversion rate x2% is recorded at this time;

[0092] (4) Repeat steps (2) and (3) until the hydrogenation stabilization unit has been running for tn hours. Under the initial process conditions, analyze the content of bicyclic aromatic hydrocarbons wn% in the solvent oil and record the coal powder conversion rate xn% at this time.

[0093] (5) Determine the correspondence between the content of bicyclic aromatic hydrocarbons w% in the solvent oil and the coal powder conversion rate x%.

[0094] 2. Begin replacing the catalyst according to the determined replacement ratio:

[0095] (1) Set the initial replacement rate to f0%. When the content of bicyclic aromatic hydrocarbons in the solvent oil reaches wn%, and the corresponding coal powder conversion rate xn% is the lowest economic indicator, start replacing the catalyst in the reactor with the initial replacement rate. Starting from the second day, increase the catalyst replacement rate z% every day, and analyze the content of bicyclic aromatic hydrocarbons in the solvent oil every day under the initial working conditions.

[0096] (2) Repeat step 2(1) in this section until the content of bicyclic aromatic hydrocarbons in the solvent oil recovers to w0% on day m. At this time, the catalyst replacement rate f% = f0% + m × z.

[0097] 3. Determine the catalyst start time and replacement rate:

[0098] (1) When the hydrogenation stabilization unit has been running for tn hours, the catalyst replacement begins when the coal powder conversion rate xn% corresponding to the wn% content of bicyclic aromatic hydrocarbons in the solvent oil reaches the minimum economic index.

[0099] (2) After the hydrogenation stabilization unit has been running for tn hours, the catalyst is replaced at a rate of f0%. On day m, the content of bicyclic aromatic hydrocarbons in the solvent oil reaches w0%. At this time, the catalyst replacement rate f% = f0% + m × z% is the final catalyst replacement rate.

[0100] The initial process conditions can be determined by those skilled in the art based on the properties of the catalyst and the raw materials. The target value of coal powder conversion rate X is 80-95%. For MO-Ni system hydrogenation stabilization catalyst, the preferred reaction temperature T is 350-390℃, the preferred reaction pressure P is 10-15MPa, and the preferred space velocity u0 is 1.0-2.5h-1.

[0101] The operating time t1 refers to the catalyst operating time before replacement begins after the new catalyst is loaded into the reactor. It can be any value between 1 and 400 hours, with the preferred operating time being 144 to 280 hours.

[0102] The pulverized coal conversion rate xn% refers to the lower limit of the pulverized coal conversion rate that meets economic requirements. Those skilled in the art can calculate it. xn can be any value from 70% to 95%, and the preferred xn is 85% to 92%.

[0103] The initial catalyst replacement rate f0 refers to the proportion of the weight of the new catalyst added to the reactor to the total weight of the catalyst in the reactor. f0 can be any value greater than 0, and preferably f0 is 0.1 to 2.5.

[0104] The m is the number of days from the start of catalyst replacement until the aromatic content in the solvent oil recovers to w0%, and m can be any value greater than 1.

[0105] The z is the daily increase in catalyst replacement rate, and z can be any value greater than 0, with a preferred z being 0.01 to 2.5.

[0106] This disclosure allows for the determination of catalyst replacement time and ratio by summarizing the relationship between the group composition of solvent oil and pulverized coal conversion rate without affecting the normal operation of industrial plants. It eliminates the need for mathematical models and frequent catalyst replacement experiments. The method described in this disclosure can be extended and generalized to the field of catalyst replacement in other types of reaction systems. The specific implementation method of the catalyst replacement method for hydrogenation stabilization units in this disclosure is as follows:

[0107] 220 tons of catalyst were loaded into the fluidized bed reactor of the hydrogenation stabilization unit. The reactor was operated for 200 hours under the following conditions: reaction temperature of 378-385℃, reaction pressure of 13.0-13.5MPa, target performance index of 25.2% of bicyclic aromatic hydrocarbon content in solvent oil, and space velocity of 1.5h-1. Catalyst replacement was started when the coal powder conversion rate was ≤85.0%.

[0108] The content of bicyclic aromatic hydrocarbons in the solvent oil was analyzed on days 1, 3, 5, and 7, and the coal powder conversion rate of the upstream unit was calculated. The data are shown in Table 1 below:

[0109] Table 1

[0110] project Day 1 Day 3 Day 5 Day 7 Day 9 Coal powder conversion rate / % 91.0 90.3 88.6 87.5 86.2 Bicyclic aromatic hydrocarbon content (w)% 26.0 25.5 25.1 24.6 23.4

[0111] Determine the relationship between the content of bicyclic aromatic hydrocarbons in solvent oil and the coal powder conversion rate:

[0112] x = ɑ*w

[0113] In the formula: x is the content (%) of bicyclic aromatic hydrocarbons in the solvent oil;

[0114] w represents the coal powder conversion rate (%).

[0115] α is a coefficient with a value between 3.5 and 3.7; in this permutation, it is taken as 3.6. That is:

[0116] x = 3.6 * w

[0117] The content of bicyclic aromatic hydrocarbons in the solvent oil generated by the hydrostabilization unit is monitored daily. Then, the daily coal powder conversion rate of the upstream unit is calculated according to the established quantitative relationship between the content of bicyclic aromatic hydrocarbons in the solvent oil and the coal powder conversion rate. If the coal powder conversion rate of the upstream unit will decrease to 85% on the 11th day, the catalyst in the reactor will be replaced starting from the 11th day.

[0118] Starting from day 11, 0.4t (a theoretical assumption used to calculate the final catalyst replacement amount) of new catalyst is used daily to replace the catalyst in the reactor, i.e., the initial replacement rate is 0.18%.

[0119] Starting from day 12, the replacement rate is increased by 0.04% daily (a theoretical assumption used to calculate the final catalyst replacement amount). During the catalyst replacement period, the bicyclic aromatic hydrocarbon content in the solvent oil is analyzed daily, while keeping the initial reaction state unchanged.

[0120] The replacement rate was stopped when the content of bicyclic aromatic hydrocarbons in the solvent oil reached 25.2% on the 16th day.

[0121] The final catalyst replacement rate is: f% = 0.18% + 4 × 0.04%, which means f = 0.34%, that is, 748 kg of catalyst is replaced per day.

[0122] Therefore, the actual time to start replacing the catalyst is 10 days after the catalyst in the reactor has been running in its initial state, that is, replacement begins on the 11th day, with a replacement rate of 0.34%.

[0123] Under the condition of meeting the process requirements, the performance indicators of the solvent oil in this disclosure may include not only the content of bicyclic aromatic hydrocarbons in the solvent oil, but also the refractive index, monocyclic aromatic hydrocarbon content, total aromatic hydrocarbon content, density, etc.

[0124] In addition to pulverized coal conversion rate, economic indicators for upstream units can also include reaction temperature, oil yield, gas yield, and ash content in asphalt.

[0125] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0126] The above is an introduction to the method embodiments. The following describes the solution described in this disclosure further through device embodiments.

[0127] Figure 2 A block diagram of a catalyst replacement apparatus 200 according to an embodiment of the present disclosure is shown. Figure 2 As shown, the device 200 includes:

[0128] Monitoring module 210 is used to monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit;

[0129] The acquisition module 220 is used to acquire a preset correspondence between the pre-generated performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit;

[0130] The determining module 230 is used to determine the current economic indicators of the coal liquefaction device based on the current performance indicators and the preset correspondence.

[0131] The replacement module 240 is used to replace the catalyst in the hydrogenation stabilization unit if the current economic index matches the minimum economic index.

[0132] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the described module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0133] According to embodiments of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.

[0134] Figure 3 A schematic block diagram of an electronic device 300 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0135] Device 300 includes a computing unit 301, which can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) 302 or a computer program loaded from storage unit 308 into random access memory (RAM) 303. The RAM 303 may also store various programs and data required for the operation of device 300. The computing unit 301, ROM 302, and RAM 303 are interconnected via bus 304. Input / output (I / O) interface 305 is also connected to bus 304.

[0136] Multiple components in device 300 are connected to I / O interface 305, including: input unit 306, such as keyboard, mouse, etc.; output unit 307, such as various types of monitors, speakers, etc.; storage unit 308, such as disk, optical disk, etc.; and communication unit 309, such as network card, modem, wireless transceiver, etc. Communication unit 309 allows device 300 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0137] The computing unit 301 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 301 performs the various methods and processes described above, such as method 100. For example, in some embodiments, method 100 may be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 308. In some embodiments, part or all of the computer program may be loaded and / or installed on device 300 via ROM 302 and / or communication unit 309. When the computer program is loaded into RAM 303 and executed by the computing unit 301, one or more steps of method 100 described above may be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform method 100 by any other suitable means (e.g., by means of firmware).

[0138] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0139] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0140] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0141] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0142] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0143] Computing systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0144] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0145] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A catalyst replacement method, characterized in that, include: Monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit; Obtain a pre-generated correspondence between the performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit; Based on the current performance indicators and the preset correspondence, the current economic indicators of the coal liquefaction unit are determined; If the current economic indicators match the minimum economic indicators, then the catalyst in the hydrogenation stabilization unit shall be replaced; If the current economic indicator matches the minimum economic indicator, then replacing the catalyst in the hydrogenation stabilization unit includes: If the absolute value of the first difference between the current economic indicator and the minimum economic indicator is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, then it is confirmed that the current economic indicator and the minimum economic indicator are matched. When matched, the catalyst in the hydrogenation stabilization unit is replaced.

2. The method according to claim 1, characterized in that, The replacement of the catalyst in the hydrogenation stabilization unit includes: Calculate the time consumed from when the absolute value of the first difference is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, to when the absolute value of the second difference between the current performance indicator and the target performance indicator is less than a preset performance threshold and the current performance indicator is greater than the target performance indicator; Obtain the preset initial replacement rate of the catalyst and the preset increase in the replacement rate of the catalyst; The amount of catalyst replaced is calculated based on the preset initial replacement rate, the preset increase, and the duration. The catalyst in the hydrogenation stabilization unit is replaced according to the stated replacement amount.

3. The method according to claim 1, characterized in that, The steps for generating the preset correspondence include: The historical performance indicators of the solvent oil and the corresponding historical economic indicators of the coal liquefaction unit at each time point are obtained; wherein, the process conditions of the hydrogenation stabilization unit are consistent at each time point; The historical performance indicators and corresponding historical economic indicators are used to perform linear fitting to obtain the preset correspondence.

4. The method according to claim 3, characterized in that, The process conditions of the hydrogenation stabilization unit are consistent at each time point, including: At each time point, the reaction temperature, reaction pressure, and space velocity of the hydrogenation stabilization unit are maintained at their respective target values.

5. The method according to any one of claims 1 to 4, characterized in that, The performance indicators of the solvent oil include at least one of the following: the refractive index of the solvent oil, the monocyclic aromatic hydrocarbon content of the solvent oil, the bicyclic aromatic hydrocarbon content of the solvent oil, the hydrogen donation index of the solvent oil, the total aromatic hydrocarbon content of the solvent oil, and the density of the solvent oil; The economic indicators of the coal liquefaction unit include at least one of the following: coal powder conversion rate, reaction temperature, oil yield, gas yield, and ash content in asphalt.

6. A catalyst replacement device, characterized in that, include: The monitoring module is used to monitor the current performance indicators of the solvent oil generated by the hydrostabilization unit; The acquisition module is used to acquire a preset correspondence between the pre-generated performance indicators of the solvent oil and the economic indicators of the coal liquefaction unit upstream of the hydrostabilization unit; The determination module is used to determine the current economic indicators of the coal liquefaction unit based on the current performance indicators and the preset correspondence. The replacement module is used to replace the catalyst in the hydrogenation stabilization unit if the current economic index matches the minimum economic index. The replacement module is specifically used for: If the absolute value of the first difference between the current economic indicator and the minimum economic indicator is less than a preset indicator threshold and the current economic indicator is less than the minimum economic indicator, then it is confirmed that the current economic indicator and the minimum economic indicator are matched. Determine whether the absolute value of the second difference between the current performance index and the target performance index is less than a preset performance threshold. If it is less than the target performance index and the current performance index is greater than the target performance index, then replace the catalyst in the hydrogenation stabilization device.

7. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-5.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-5.

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