Method and device for evaluating energy consumption of catalytic cracking device and storage medium

Abstract

The invention discloses an energy consumption evaluation method and device for a catalytic cracking device and a storage medium. The method comprises the following steps: establishing a whole-process simulation model of the current catalytic cracking device; determining optimal practical parameters of the current catalytic cracking device; based on the optimal practical parameters and the full-process simulation model, obtaining the simulation energy consumption of the current catalytic cracking device as the optimal practical energy consumption; acquiring the actual energy consumption of the current catalytic cracking device; and calculating the energy consumption index of the current catalytic cracking device according to the optimal practical energy consumption and the actual energy consumption. Through the scheme, the energy consumption index of the current catalytic cracking device can be calculated, the energy consumption of the current specific catalytic cracking device can be evaluated, and further, the energy consumption levels of the catalytic cracking devices of the same kind can be transversely compared.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to, but are not limited to, the technical field of energy consumption evaluation, and particularly relate to an energy consumption evaluation method, device and storage medium for a fluid catalytic cracking unit. Background Art

[0002] Fluid catalytic cracking is an important secondary processing unit in refineries and petrochemical enterprises, and its energy consumption accounts for about 10%-30% of the total energy consumption of the enterprise. The energy consumption evaluation of the fluid catalytic cracking unit plays an important supporting role in clarifying the energy consumption level and energy-saving potential of the fluid catalytic cracking unit, and improving the energy consumption level, optimizing operation and improving technology of the fluid catalytic cracking unit.

[0003] At present, the domestic mainly uses energy consumption quota as the method for evaluating the energy consumption level of fluid catalytic cracking units, that is, the energy consumption quota is determined based on the energy consumption index of the domestic average advanced fluid catalytic cracking unit, and the actual statistical comprehensive energy consumption index of the fluid catalytic cracking unit is compared with the energy consumption quota to clarify the gap. The fluid catalytic cracking units are divided into wax oil fluid catalytic cracking units and residue fluid catalytic cracking units according to the raw material type, and into heavy oil fluid catalytic cracking units, fluid catalytic cracking units for producing more isoparaffins, etc. according to the process characteristics, and their energy consumption quotas are set respectively. Compared with directly comparing the comprehensive energy consumption statistical index of the fluid catalytic cracking unit, this method subdivides the influence of different raw materials and process types on energy consumption, making the energy consumption index of different types of fluid catalytic cracking units have a more reasonable evaluation basis. However, since it only compares with similar types of fluid catalytic cracking units with average advanced energy consumption levels and does not fully consider the actual characteristics of each specific fluid catalytic cracking unit, directly using the energy consumption quota as the improvement goal of the energy consumption index of a specific fluid catalytic cracking unit has weak applicability and scientificity.

[0004] Therefore, it is an urgent technical problem to be solved at present to invent an evaluation method that can solve the problems that the current energy consumption evaluation method cannot reflect the characteristics of the fluid catalytic cracking unit, thus cannot clarify the energy-saving potential and improvement direction, and cannot horizontally compare the energy consumption levels of fluid catalytic cracking units. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail in this article. This overview is not intended to limit the scope of protection of the claims.

[0006] The present disclosure provides an energy consumption evaluation method, device and storage medium for a fluid catalytic cracking unit, which can calculate the energy consumption index of the current fluid catalytic cracking unit and evaluate the energy consumption of the current specific fluid catalytic cracking unit.

[0007] An embodiment of the present disclosure provides an energy consumption evaluation method for a fluid catalytic cracking unit, including:

[0008] Establish a full-process simulation model of the current fluid catalytic cracking unit;

[0009] Determine the best practice parameters of the current fluid catalytic cracking unit;

[0010] Based on the best practice parameters and the full - process simulation model, obtain the simulated energy consumption of the current fluid catalytic cracking unit as the best practice energy consumption;

[0011] Obtain the actual energy consumption of the current fluid catalytic cracking unit;

[0012] Calculate the energy consumption index of the current fluid catalytic cracking unit according to the best practice energy consumption and the actual energy consumption.

[0013] An embodiment of the present disclosure further provides an energy consumption evaluation device for a fluid catalytic cracking unit, including: a memory and a processor;

[0014] The memory is used to store a program for energy consumption evaluation of the fluid catalytic cracking unit;

[0015] The processor is used to read the program for energy consumption evaluation of the fluid catalytic cracking unit and execute the energy consumption evaluation method for the fluid catalytic cracking unit as described in any embodiment of the present disclosure.

[0016] An embodiment of the present disclosure further provides a non - transient computer - readable storage medium, which stores a computer program. When the computer program is executed by a processor, it can implement the energy consumption evaluation method for the fluid catalytic cracking unit as described in any embodiment of the present disclosure.

[0017] Compared with the related art, an energy consumption evaluation method, device and storage medium for a fluid catalytic cracking unit provided by the embodiments of the present disclosure can obtain the best practice energy consumption of the current fluid catalytic cracking unit by using the established full - process simulation model of the current fluid catalytic cracking unit and the determined best practice parameters of the current fluid catalytic cracking unit. Furthermore, the energy consumption index of the current fluid catalytic cracking unit can be calculated to evaluate the energy consumption of a specific fluid catalytic cracking unit, clarify the energy - saving potential of the fluid catalytic cracking unit according to the magnitude of the energy consumption index, and further, the energy consumption levels of similar fluid catalytic cracking units can also be compared horizontally.

[0018] Other features and advantages of the embodiments of the present application will be described in the following specification, and some of them will become obvious from the specification, or be understood by implementing the embodiments of the present application. The objectives and other advantages of the embodiments of the present application can be achieved and obtained through the structures specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide an understanding of the technical solutions of the present disclosure, and constitute a part of the specification. They are used together with the embodiments of the present disclosure to explain the technical solutions of the present disclosure, and do not constitute a limitation to the technical solutions of the present disclosure.

[0020] Figure 1 It is a flowchart of an energy consumption evaluation method for a fluid catalytic cracking unit according to an embodiment of the present disclosure;

[0021] Figure 2 It is a specific flowchart of an energy consumption evaluation method for a fluid catalytic cracking unit according to an embodiment of the present disclosure;

[0022] Figure 3 It is a schematic diagram of a device for determining the energy consumption index of a fluid catalytic cracking unit according to an embodiment of the present disclosure;

[0023] Figure 4 It is a schematic diagram of an energy consumption evaluation device for a fluid catalytic cracking unit according to an embodiment of the present disclosure. Detailed implementation manners

[0024] The present disclosure describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those of ordinary skill in the art that there can be more embodiments and implementation schemes within the scope covered by the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the detailed implementation manners, many other combination ways of the disclosed features are also possible. Unless specifically restricted, any feature or element of any embodiment can be combined with any other feature or element in any other embodiment, or can replace any other feature or element in any other embodiment.

[0025] The present disclosure includes and contemplates combinations with features and elements known to those of ordinary skill in the art. The embodiments, features, and elements already disclosed in the present disclosure can also be combined with any conventional features or elements to form a unique invention solution defined by the claims. Any feature or element of any embodiment can also be combined with features or elements from other invention solutions to form another unique invention solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present disclosure can be implemented alone or in any appropriate combination. Therefore, the embodiments are not subject to other restrictions except those made according to the appended claims and their equivalent replacements. In addition, various modifications and changes can be made within the protection scope of the appended claims.

[0026] An embodiment of the present disclosure provides an energy consumption evaluation method for a fluid catalytic cracking unit, as Figure 1 shown, which may include the following steps:

[0027] Step S110: Establish a full-process simulation model of the current fluid catalytic cracking unit;

[0028] Step S120: Determine the best practice parameters of the current fluid catalytic cracking unit;

[0029] Step S130: Based on the best practice parameters and the full-process simulation model, obtain the simulated energy consumption of the current fluid catalytic cracking unit as the best practice energy consumption.

[0030] Step S140: Obtain the actual energy consumption of the current fluid catalytic cracking unit.

[0031] Step S150: Calculate the energy consumption index of the current fluid catalytic cracking unit according to the best practice energy consumption and the actual energy consumption.

[0032] Among them, the best practice parameters are the parameters when the energy consumption of the current fluid catalytic cracking unit is the lowest, and the best practice energy consumption is the energy consumption of the current fluid catalytic cracking unit under the best practice parameters (i.e., the best operating conditions), that is, the lowest energy consumption.

[0033] Exemplarily, the full-process simulation model is established using process simulation software. For example, a simulation model of a fluid catalytic cracking unit is established using process simulation software. The simulation model mainly includes a full-process simulation model and an energy consumption calculation model. The full-process simulation model is used to simulate each unit equipment and the full process of the fluid catalytic cracking unit, and the energy consumption calculation model is used to calculate the energy consumption of the fluid catalytic cracking unit. After completion of construction, it is necessary to ensure that the constructed simulation model highly coincides with the actual fluid catalytic cracking unit to be evaluated, and the energy consumption calculation model is highly consistent with the energy consumption statistical results.

[0034] The energy consumption evaluation method for the fluid catalytic cracking unit in this embodiment determines the best practice energy consumption (i.e., the lowest energy consumption under the best operating conditions) of the current fluid catalytic cracking unit based on the full-process simulation model and the determined best practice parameters, and further calculates the energy consumption index of the fluid catalytic cracking unit. Since the above best practice parameters are set according to the characteristics of the current fluid catalytic cracking unit, the energy consumption index calculated in this embodiment can intuitively reflect the energy consumption level of the current specific fluid catalytic cracking unit, so that the energy-saving potential of the fluid catalytic cracking unit can be clarified according to the size of the energy consumption index.

[0035] Furthermore, because the energy consumption index calculated in this embodiment can reflect the energy consumption level of the specific fluid catalytic cracking unit, after calculating the energy consumption indexes of different fluid catalytic cracking units using the energy consumption evaluation method of this embodiment, the energy consumption levels of different fluid catalytic cracking units can be compared horizontally through this energy consumption index.

[0036] In an exemplary embodiment of the present disclosure, the best practice parameters include one or more of the following: pressure drop from the outlet of the main blower to the inlet of the expander, pressure drop from the top of the settler to the inlet of the compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich gas compressor, temperature of diesel oil out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank, heat extraction ratio of high-temperature heat to low-temperature heat in the middle section circulation of the main fractionator, ethane content in the de-ethanized gasoline at the bottom of the desorber, flue gas temperature of the waste heat boiler, temperature of the feedstock into the unit.

[0037] The above parameters in this embodiment are parameters that have a greater impact on the energy consumption of the fluid catalytic cracking unit obtained based on experience. Therefore, selecting the above parameters as the best practice parameters for process simulation can make the simulated best practice energy consumption and the finally obtained energy consumption index better represent the current energy consumption level of the fluid catalytic cracking unit.

[0038] In an exemplary embodiment of the present disclosure, determining the best practice parameters of the current fluid catalytic cracking unit includes:

[0039] Determining the best practice parameters (referring to the parameter values for determining the best practice parameters) based on the historical data of the current fluid catalytic cracking unit; and / or,

[0040] Performing process simulation through the full-process simulation model, and taking the parameter values when the energy consumption of the process simulation is the lowest as the best practice parameters of the current fluid catalytic cracking unit. Exemplarily, in the above step S120, the values of each best practice parameter can be sequentially determined through the full-process simulation model by adopting the principle of single-factor variables. This method is more time-saving and labor-saving without increasing labor costs.

[0041] The energy consumption evaluation method of the fluid catalytic cracking unit in this embodiment selects the best historical operation technical indicators and technical parameters from the historical data of the same type of fluid catalytic cracking units statistically as the best practice parameters, and then performs process simulation based on the best practice parameters that fit the reality, so that the simulated energy consumption of the current fluid catalytic cracking unit finally fits the reality (that is, the obtained best practice energy consumption is closer to the actual best energy consumption of the current fluid catalytic cracking unit), and thus the energy consumption index calculated based on the best practice energy consumption can be more accurate and closer to the actual situation.

[0042] Moreover, the energy consumption evaluation method of the fluid catalytic cracking unit in this embodiment performs process simulation through the full-process simulation model (such as performing process simulation under the conditions of meeting the constraints of the unit and equipment and product quality), and takes the best technical indicators and technical parameters corresponding to the lowest power consumption simulated by the full-process simulation model as the best practice parameters, which is more efficient compared to confirming the best practice parameters by statistically analyzing historical data.

[0043] In an example of this embodiment, when the best practice parameters include one or more of the pressure drop from the main blower outlet to the inlet of the expander, the pressure drop from the top of the settler to the inlet of the compressor, the ratio of atomizing steam to feedstock in the reactor, the ratio of stripping steam to catalyst circulation rate in the reactor, the oxygen content in the flue gas of the regenerator, the opening of the expander bypass butterfly valve, the adiabatic efficiency of the main blower, the polytropic efficiency of the expander, the adiabatic efficiency of the rich gas compressor, the temperature of diesel oil out of the unit, the temperature of stabilized gasoline out of the unit, and the temperature of the condensate oil tank, the pressure drop from the main blower outlet to the inlet of the expander, the pressure drop from the top of the settler to the inlet of the compressor, the ratio of atomizing steam to feedstock in the reactor, the ratio of stripping steam to catalyst circulation rate in the reactor, the oxygen content in the flue gas of the regenerator, the opening of the expander bypass butterfly valve, the adiabatic efficiency of the main blower, the polytropic efficiency of the expander, the adiabatic efficiency of the rich gas compressor, the temperature of diesel oil out of the unit, the temperature of stabilized gasoline out of the unit, and the temperature of the condensate oil tank are determined according to the historical data of catalytic cracking units of the same type as the current catalytic cracking unit.

[0044] Exemplarily, the historical best technical indicators and technical parameters of catalytic cracking units of the same type as the current catalytic cracking unit can be obtained by manual statistics, or the historical best technical indicators and technical parameters of catalytic cracking units of the same type as the current catalytic cracking unit can be screened out through a screening model or the like.

[0045] The energy consumption evaluation method for the catalytic cracking unit in this example, aiming at the characteristics of the above parameters, confirms their optimal values according to historical data, so that the best practice energy consumption of the current catalytic cracking unit finally simulated is in line with reality, and further enables the energy consumption index calculated according to the best practice energy consumption to be more accurate and more in line with the actual situation.

[0046] In an example of this embodiment, when the best practice parameters include the heat extraction ratio of high-temperature heat to low-temperature heat in the middle section circulation of the main fractionator and the ethane content in the de-ethanized gasoline at the bottom of the desorber, the heat extraction ratio of high-temperature heat to low-temperature heat in the middle section circulation of the main fractionator and the ethane content in the de-ethanized gasoline at the bottom of the desorber are calculated after process simulation through the whole-process simulation model.

[0047] The energy consumption evaluation method for the catalytic cracking unit in this example can more efficiently confirm the best practice parameters of the heat extraction ratio of high-temperature heat to low-temperature heat in the middle section circulation of the main fractionator and the ethane content in the de-ethanized gasoline at the bottom of the desorber through process simulation by the whole-process simulation model.

[0048] In an example of this embodiment, when the best practice parameter includes the flue gas temperature of the waste heat boiler, the flue gas temperature of the waste heat boiler is calculated according to the flue gas composition of the current fluid catalytic cracking unit and according to an empirical formula. Among them, different flue gas compositions correspond to different empirical formulas, and the empirical formulas can be obtained based on historical empirical data.

[0049] The energy consumption evaluation method for the fluid catalytic cracking unit in this example selects different determination methods according to different parameter characteristics. For the flue gas temperature of the waste heat boiler, it is determined by calculating according to the flue gas composition of the current fluid catalytic cracking unit. Combining the actual characteristics of the parameters, it can better and more conveniently determine the optimal value of the flue gas temperature of the waste heat boiler.

[0050] In an example of this embodiment, when the best practice parameter includes the temperature of the raw material entering the unit, the temperature of the raw material entering the unit is determined according to the unit type of the current fluid catalytic cracking unit.

[0051] The energy consumption evaluation method for the fluid catalytic cracking unit in this example sets the temperature of the raw material entering the unit to different values according to the unit type of the current fluid catalytic cracking unit, which can improve the accuracy of the best practice energy consumption of the current fluid catalytic cracking unit simulated by the full-process simulation model. Furthermore, it can improve the accuracy of the energy consumption index of the finally obtained fluid catalytic cracking unit and improve the accuracy of the energy consumption evaluation of the fluid catalytic cracking unit.

[0052] Exemplarily, the fluid catalytic cracking unit includes a heavy oil fluid catalytic cracking unit and a gas oil fluid catalytic cracking unit. When the unit type of the current fluid catalytic cracking unit is a heavy oil fluid catalytic cracking unit, the temperature of the raw material entering the unit can be a first preset value; when the unit type of the current fluid catalytic cracking unit is a gas oil fluid catalytic cracking unit, the temperature of the raw material entering the unit can be a second preset value; among them, the first preset value and the second preset value are different. For the evaluation of two different types of fluid catalytic cracking units, namely heavy oil fluid catalytic cracking and gas oil fluid catalytic cracking, the temperature of the raw material entering the unit corresponds to different fixed values. In this way, for the evaluation of these two types of fluid catalytic cracking units, the evaluation accuracy can be improved.

[0053] In summary, the best practice parameters in this embodiment are the technical indicators and technical parameters that can be achieved through the application of new technologies, technical transformation, etc. under the current technical and economic conditions as the best practice parameters.

[0054] In an exemplary embodiment of the present disclosure, the method further includes: outputting an energy consumption level based on a preset energy consumption level index and the energy consumption index.

[0055] Exemplarily, the energy consumption index and the energy consumption level are calculated by an energy consumption calculation model. Among them, the energy consumption calculation model is established using process simulation software.

[0056] The energy consumption evaluation method for the fluid catalytic cracking unit in this embodiment, after obtaining the energy consumption index of the current fluid catalytic cracking unit, compares the energy consumption index with the preset energy consumption grade index, so as to determine the energy consumption grade of the current fluid catalytic cracking unit, and can more intuitively understand the energy consumption situation of the current fluid catalytic cracking unit, improving the user experience.

[0057] Exemplarily, the energy-saving potential of the current fluid catalytic cracking unit can also be evaluated according to the magnitude of the energy consumption index; among them, the energy-saving potential can be expressed by the difference between the actual energy consumption and the best practice energy consumption.

[0058] The energy consumption evaluation method for the fluid catalytic cracking unit in this embodiment can quantitatively reflect the energy consumption level of the current fluid catalytic cracking unit through the energy consumption index and energy consumption grade, and intuitively reflect the energy-saving potential of the current fluid catalytic cracking unit through the energy-saving potential, improving the user experience.

[0059] In an exemplary embodiment of the present disclosure, the formula for calculating the energy consumption index of the current fluid catalytic cracking unit can be:

[0060] ECI = Ea / Eb;

[0061] Wherein, ECI is the energy consumption index, Ea is the actual energy consumption, and Eb is the best practice energy consumption. It can be seen that the smaller the energy consumption index of different fluid catalytic cracking units, the higher the energy consumption level of the fluid catalytic cracking unit.

[0062] The energy consumption evaluation method for the fluid catalytic cracking unit in this embodiment obtains the energy consumption index by dividing the actual energy consumption by the simulated energy consumption, and can accurately evaluate the energy consumption index of the fluid catalytic cracking unit.

[0063] In summary, the energy consumption evaluation method for the fluid catalytic cracking unit of the present disclosure can evaluate the energy-saving potential of the fluid catalytic cracking unit in the scope of large unit efficiency and production operation parameters according to the magnitude of the energy consumption index, and horizontally compare the energy consumption levels of different fluid catalytic cracking units in the scope of large unit efficiency and production operation parameters, solving the problems that the current energy consumption evaluation device cannot reflect the characteristics of the fluid catalytic cracking unit, cannot quantitatively clarify the energy-saving potential and improvement direction, and cannot horizontally compare the energy consumption levels of fluid catalytic cracking units.

[0064] The following is the complete process of energy consumption evaluation using the energy consumption evaluation method for the fluid catalytic cracking unit of the present disclosure, as Figure 2 shown, which may include the following steps:

[0065] Step S210: Collect all the data and information required for simulation, such as the process of the fluid catalytic cracking unit, equipment design, process cards, production operation, raw material and product analysis and testing, product quality control indicators, and unit energy consumption.

[0066] Step S220: Establish a full - process simulation model and an energy consumption calculation model for the current fluid catalytic cracking unit using process simulation software, and ensure that the energy consumption data simulated by the full - process simulation model highly coincides with the actual energy consumption data of the current fluid catalytic cracking unit (for example, calculate the difference between the simulated energy consumption data and the actual energy consumption data, and control the absolute value of the difference within a preset maximum error range), and the simulated energy consumption result calculated by the energy consumption calculation model is highly consistent with the actual energy consumption result of the current fluid catalytic cracking unit (for example, calculate the difference between the simulated energy consumption result and the actual energy consumption result, and control the absolute value of the difference within a preset maximum error range).

[0067] Step S230: Determine the best - practice parameters of the current fluid catalytic cracking unit, which may include the following steps:

[0068] Step S231: Determine 16 best - practice parameters of the current fluid catalytic cracking unit, which can be: pressure drop from the main blower outlet to the inlet of the expander, pressure drop from the top of the settler to the inlet of the gas compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich gas compressor, temperature of diesel out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank, heat extraction ratio of high - temperature heat to low - temperature heat in the middle section circulation of the main fractionator, ethane content in the de - ethane gasoline at the bottom of the desorber, flue gas temperature of the waste heat boiler, temperature of the feedstock into the unit.

[0069] Step S232: Determine the optimal value of each of the above - mentioned parameters.

[0070] Exemplarily, according to the historical data of the fluid catalytic cracking unit, determine the optimal values of "pressure drop from the main blower outlet to the inlet of the expander, pressure drop from the top of the settler to the inlet of the gas compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich gas compressor, temperature of diesel out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank" among the above - mentioned parameters.

[0071] Exemplarily, determine the value of the feedstock inlet temperature according to the unit type of the current fluid catalytic cracking unit. For example, the fluid catalytic cracking unit includes a heavy - oil fluid catalytic cracking unit and a gas - oil fluid catalytic cracking unit. When the unit type of the current fluid catalytic cracking unit is a heavy - oil fluid catalytic cracking unit, when using the energy consumption evaluation method of the fluid catalytic cracking unit of the present disclosure to determine its energy consumption index, the feedstock inlet temperature can be a first preset value; when the unit type of the current fluid catalytic cracking unit is a gas - oil fluid catalytic cracking unit, when using the energy consumption evaluation method of the fluid catalytic cracking unit of the present disclosure to determine its energy consumption index, the feedstock inlet temperature can be a second preset value; where the first preset value and the second preset value are different.

[0072] Exemplarily, the optimal value of the flue gas temperature of the waste heat boiler is calculated through an empirical formula based on the flue gas composition of the evaluated fluid catalytic cracking unit.

[0073] Exemplarily, process simulation is carried out through the full-process simulation model of the evaluated fluid catalytic cracking unit, and the optimal values of the heat extraction ratios of the high-temperature and low-temperature heat in the middle section circulation of the main fractionator and the ethane content in the de-ethanized gasoline at the bottom of the desorption column are calculated in combination with the simulation results.

[0074] Step S240: Substitute the confirmed best practice parameters into the full-process simulation model, and calculate a new set of simulated energy consumption as the best practice energy consumption of the current fluid catalytic cracking unit.

[0075] Step S250: Calculate the energy consumption index of the current fluid catalytic cracking unit according to the actual energy consumption and the best practice energy consumption. The calculation formula can be: ECI = Ea / Eb; where ECI is the energy consumption index, Ea is the actual energy consumption, and Eb is the best practice energy consumption. It can be seen that the smaller the energy consumption index of different fluid catalytic cracking units, the higher the energy utilization level of the fluid catalytic cracking unit.

[0076] Step S260: Evaluate the energy-saving potential of the current fluid catalytic cracking unit according to the magnitude of the energy consumption index. Exemplarily, the energy-saving potential can be expressed by the difference between the actual energy consumption and the best practice energy consumption.

[0077] Exemplarily, taking a certain wax oil fluid catalytic cracking unit as an example, after performing the above steps on the wax oil fluid catalytic cracking unit, the best practice energy consumption of the wax oil fluid catalytic cracking unit (i.e., the simulated energy consumption obtained by process simulation through the full-process simulation model under the best practice parameter conditions) and the actual energy consumption can be obtained, as shown in Table 1 (kgoe / t represents kilograms of standard oil per ton):

[0078] Table 1 Comparison Table of Actual Energy Consumption and Best Practice Energy Consumption of a Certain Wax Oil Fluid Catalytic Cracking Unit

[0079]

[0080] As can be seen from Table 1, the best practice energy consumption of 45.48 kgoe / t of raw materials is significantly lower than the actual energy consumption of 54.35 kgoe / t of raw materials, with a decrease of 16.32%. That is, under the best practice parameter conditions, the energy consumption of the fluid catalytic cracking unit is significantly reduced. The reduction in the energy consumption of this fluid catalytic cracking unit is mainly manifested in two aspects: electricity and medium-pressure steam. The power consumption decreases from 8.966 kgoe / t of raw materials to 2.762 kgoe / t of raw materials, and the output of medium-pressure steam increases from 30.23 kgoe / t of raw materials to 34.49 kgoe / t of raw materials. Therefore, the main directions for optimizing the energy utilization of this fluid catalytic cracking unit are to reduce power consumption (such as improving the work capacity of the catalytic expander), increase the input of medium-pressure steam (such as reducing the heat dissipation of the unit), and increase the heat recovery rate of the waste heat boiler.

[0081] Exemplarily, taking a heavy oil fluid catalytic cracking unit as an example, after performing the above steps on this heavy oil fluid catalytic cracking unit, the best practice energy consumption and actual energy consumption of this heavy oil fluid catalytic cracking unit can be obtained, as shown in Table 2:

[0082] Table 2 Comparison Table of Actual Energy Consumption and Best Practice Energy Consumption of a Heavy Oil Fluid Catalytic Cracking Unit

[0083]

[0084]

[0085] As can be seen from Table 2, the best practice energy consumption of 47.20 kgoe / t of raw materials is significantly lower than the actual energy consumption of 59.34 kgoe / t of raw materials, with a decrease of 20.46%. The power consumption of this fluid catalytic cracking unit decreases from 8.24 kgoe / t of raw materials to 2.617 kgoe / t of raw materials, and the output of medium-pressure steam increases from 62.81 kgoe / t of raw materials to 67.55 kgoe / t of raw materials. Therefore, the main directions for optimizing the energy utilization of this fluid catalytic cracking unit are also to reduce power consumption (such as improving the work capacity of the catalytic expander), increase the input of medium-pressure steam (such as reducing the heat dissipation of the unit), and increase the heat recovery rate of the waste heat boiler.

[0086] Step S270: Horizontally compare the energy utilization levels of different fluid catalytic cracking units.

[0087] Exemplarily, according to Table 1 above, the energy consumption index ECI of a certain wax oil fluid catalytic cracking unit can be calculated as ECI = 54.35 / 45.48 = 1.195, and the energy saving potential is calculated as 54.35 - 45.48 = 8.87 kgoe / t feedstock; according to Table 2 above, the energy consumption index ECI of a certain heavy oil fluid catalytic cracking unit can be calculated as ECI = 59.34 / 47.20 = 1.257, and the energy saving potential is calculated as 59.34 - 47.20 = 12.14 kgoe / t feedstock; by comparing the energy consumption index and energy saving potential of the wax oil fluid catalytic cracking unit and the heavy oil fluid catalytic cracking unit, it can be considered that the energy utilization level of the wax oil fluid catalytic cracking unit is higher than that of the heavy oil fluid catalytic cracking unit.

[0088] For the energy utilization evaluation method of the fluid catalytic cracking unit in this embodiment, first, a simulation model of the fluid catalytic cracking unit is established using process simulation software (the simulation model mainly includes a full-process simulation model and an energy consumption calculation model. The full-process simulation model is used to simulate each unit equipment and the full process of the fluid catalytic cracking unit, and the energy consumption calculation model is used to calculate the energy consumption of the fluid catalytic cracking unit to ensure that the constructed simulation model highly coincides with the actual fluid catalytic cracking unit to be evaluated, and the energy consumption calculation model is highly consistent with the energy consumption statistical results); then, the best practice parameters are determined through statistics or calculation, that is, the operating parameters that can make the fluid catalytic cracking unit have the minimum energy consumption; then, the best practice parameters are substituted into the simulation model to calculate a set of simulated energy consumption, and then the actual energy consumption of the fluid catalytic cracking unit is obtained. The actual energy consumption of the fluid catalytic cracking unit to be evaluated is divided by the simulated energy consumption under the condition of the best practice parameters to obtain the energy consumption index. It can be understood that each fluid catalytic cracking unit has a set of optimal practice data, that is, the best practice parameters of the present disclosure. However, in the actual working process, the fluid catalytic cracking unit cannot work completely according to the optimal practice data, which leads to an increase in energy consumption. Therefore, the present disclosure first simulates the minimum energy consumption (i.e., simulated energy consumption) through the model, then obtains the actual energy consumption, and finally divides the actual energy consumption by the minimum energy consumption to obtain the energy consumption index. The smaller the energy consumption index of different fluid catalytic cracking units, the higher the energy utilization level of the unit. The energy utilization evaluation method of the fluid catalytic cracking unit of the present disclosure can accurately evaluate the energy consumption index of the fluid catalytic cracking unit, thus solving the technical problems that the energy utilization evaluation of the fluid catalytic cracking unit cannot reflect the characteristics of the unit, so it is impossible to quantitatively clarify the energy saving potential and improvement direction, and it is impossible to horizontally compare the energy utilization levels of different units.

[0089] An embodiment of the present disclosure further provides a device for determining the energy consumption index of a fluid catalytic cracking unit (which can also be called an energy utilization evaluation device for a fluid catalytic cracking unit), see Figure 3 , including: a construction unit, a confirmation unit, a control unit, and an acquisition unit;

[0090] The construction unit is used to establish a full-process simulation model of the current fluid catalytic cracking unit;

[0091] The confirmation unit is configured to determine the best practice parameters of the current fluid catalytic cracking unit;

[0092] The control unit is configured to control the full - process simulation model to perform process simulation based on the best practice parameters, and obtain the simulated energy consumption of the current fluid catalytic cracking unit as the best practice energy consumption;

[0093] The acquisition unit is configured to acquire the actual energy consumption of the current fluid catalytic cracking unit;

[0094] The confirmation unit is further configured to calculate the energy consumption index of the current fluid catalytic cracking unit according to the actual energy consumption and the best practice energy consumption.

[0095] An embodiment of the present disclosure further provides an energy consumption evaluation device for a fluid catalytic cracking unit. Refer to Figure 4 , including: a memory and a processor;

[0096] The memory is configured to store a program for energy consumption evaluation of a fluid catalytic cracking unit;

[0097] The processor is configured to read the program for energy consumption evaluation of a fluid catalytic cracking unit and execute the energy consumption evaluation method for a fluid catalytic cracking unit as described in any embodiment of the present disclosure.

[0098] The processor in the above - mentioned embodiment of the present disclosure may be a general - purpose processor, including a central processing unit (CPU), a network processor (NP for short), a micro - processor, etc., or other conventional processors, etc.; the processor may also be a digital signal processor (DSP), an application - specific integrated circuit (ASIC), a field - programmable gate array (FPGA), discrete logic or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or other equivalent integrated or discrete logic circuits, or a combination of the above devices. That is, the processor in the above - mentioned embodiment may be any processor device or device combination that implements the various methods, steps, and logic block diagrams disclosed in the embodiments of the present disclosure. If a part of the embodiments of the present disclosure is implemented in software, then the instructions for the software can be stored in a suitable non - volatile computer - readable storage medium, and one or more processors can execute the instructions in hardware to implement the methods of the embodiments of the present disclosure. The term "processor" used herein may refer to the above - mentioned structure or any other structure suitable for implementing the technologies described herein.

[0099] An embodiment of the present disclosure further provides a non - transient computer - readable storage medium storing a computer program, wherein the computer program, when executed by a processor, is capable of implementing the energy consumption evaluation method for a fluid catalytic cracking unit as described in any embodiment of the present disclosure.

[0100] The present disclosure provides a scientific, efficient, and practical method, apparatus, and readable storage medium for determining the energy consumption index of a fluid catalytic cracking unit. This method can reflect the actual characteristics of the fluid catalytic cracking unit itself, quantitatively clarify the energy-saving potential and improvement directions, and conduct horizontal comparisons, providing tools and methods for improving the energy utilization level, energy conservation, and emission reduction of the fluid catalytic cracking unit, and promoting energy conservation, carbon reduction, efficiency improvement, and efficient operation of refining enterprises.

[0101] In one or more of the above exemplary embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functionality may be stored on or transmitted via a computer-readable medium as one or more instructions or codes and executed by a hardware-based processing unit. The computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium including any medium that facilitates the transfer of a computer program, such as according to a communication protocol, from one place to another. In this way, the computer-readable medium generally corresponds to a non-transitory tangible computer-readable storage medium or a communication medium such as a signal or a carrier wave. The data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the techniques described in the present disclosure. A computer program product may include a computer-readable medium.

[0102] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM, or other optical disk storage devices, magnetic disk storage devices, or other magnetic storage devices, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Also, any connection may be referred to as a computer-readable medium. For example, if instructions are transmitted using coaxial cables, fiber optic cables, twisted pairs, digital subscriber lines (DSL), or wireless technologies such as infrared, radio, and microwave from a website, server, or other remote source, then the coaxial cables, fiber optic cables, twisted pairs, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of the medium. However, it should be understood that the computer-readable storage medium and the data storage medium do not include connections, carrier waves, signals, or other transient media, but rather are directed to non-transitory tangible storage media. As used herein, disk and optical disk include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks, or Blu-ray discs, etc., where disks typically reproduce data magnetically, and optical discs use lasers to reproduce data optically. The above combinations should also be included within the scope of the computer-readable medium.

Claims

1. An energy evaluation method for a fluid catalytic cracking unit, characterized in that Including: Establishing a full - process simulation model of the current fluid catalytic cracking unit; Determining the best - practice parameters of the current fluid catalytic cracking unit; Based on the best - practice parameters and the full - process simulation model, obtaining the simulated energy consumption of the current fluid catalytic cracking unit as the best - practice energy consumption; Obtaining the actual energy consumption of the current fluid catalytic cracking unit; Calculating the energy - consumption index of the current fluid catalytic cracking unit according to the best - practice energy consumption and the actual energy consumption.

2. The method according to claim 1, wherein: The best - practice parameters include one or more of the following: pressure drop from the main blower outlet to the inlet of the expander, pressure drop from the top of the settler to the inlet of the compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich - gas compressor, temperature of diesel out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank, heat - extraction ratio of high - temperature heat to low - temperature heat in the middle section circulation of the main fractionator, ethane content in the de - ethane gasoline at the bottom of the desorber, flue - gas temperature of the waste - heat boiler, temperature of the feedstock into the unit.

3. The method according to claim 1, wherein The determining the best - practice parameters of the current fluid catalytic cracking unit includes: Determining the best - practice parameters according to the historical data of the current fluid catalytic cracking unit; and / or, Performing process simulation through the full - process simulation model, and taking the value of the parameters when the energy consumption of the process simulation is the lowest as the best - practice parameters of the current fluid catalytic cracking unit.

4. The method according to claim 2, wherein: When the best - practice parameters include one or more of the pressure drop from the main blower outlet to the inlet of the expander, pressure drop from the top of the settler to the inlet of the compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich - gas compressor, temperature of diesel out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank, the pressure drop from the main blower outlet to the inlet of the expander, pressure drop from the top of the settler to the inlet of the compressor, ratio of atomizing steam to feedstock in the reactor, ratio of stripping steam to catalyst circulation rate in the reactor, oxygen content in the flue gas of the regenerator, opening of the expander bypass butterfly valve, adiabatic efficiency of the main blower, polytropic efficiency of the expander, adiabatic efficiency of the rich - gas compressor, temperature of diesel out of the unit, temperature of stabilized gasoline out of the unit, temperature of the condensate oil tank are determined according to the historical data of the fluid catalytic cracking units of the same type as the current fluid catalytic cracking unit.

5. The method according to claim 2, wherein: When the best - practice parameters include the heat - extraction ratio of high - temperature heat to low - temperature heat in the middle section circulation of the main fractionator and the ethane content in the de - ethane gasoline at the bottom of the desorber, the heat - extraction ratio of high - temperature heat to low - temperature heat in the middle section circulation of the main fractionator and the ethane content in the de - ethane gasoline at the bottom of the desorber are calculated after performing process simulation through the full - process simulation model.

6. The method according to claim 2, wherein: When the best practice parameter includes the flue gas temperature of the waste heat boiler, the flue gas temperature of the waste heat boiler is calculated according to the flue gas composition of the current fluid catalytic cracking unit.

7. The method according to claim 2, wherein: When the best practice parameter includes the temperature of the feedstock entering the unit, the temperature of the feedstock entering the unit is determined according to the unit type of the current fluid catalytic cracking unit.

8. The method according to claim 1, wherein: The method further includes: outputting an energy consumption level based on a preset energy consumption level index and the energy consumption index; The energy consumption index and the energy consumption level are calculated by an energy consumption calculation model.

9. An energy evaluation device for a fluid catalytic cracking unit, comprising: A memory and a processor; characterized in that: The memory is used to store a program for energy consumption evaluation of a fluid catalytic cracking unit; The processor is configured to read the program for energy consumption evaluation of the fluid catalytic cracking unit and execute the energy consumption evaluation method of the fluid catalytic cracking unit according to any one of claims 1 to 8.

10. A non-transitory computer-readable storage medium storing a computer program, wherein, When the computer program is executed by the processor, it can implement the energy consumption evaluation method of the fluid catalytic cracking unit according to any one of claims 1 to 8.

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