Method and system for comprehensively monitoring real-time state of smoke machine unit, electronic device and storage medium

Abstract

The application discloses a kind of comprehensive condition real-time monitoring method and system of flue gas turbine unit, the method includes A, constructs flue gas turbine theoretical power calculation model, the mass flow of flue gas entering flue gas turbine under standard state, mixed flue gas constant-pressure specific heat capacity, flue gas turbine inlet temperature, flue gas turbine inlet pressure, flue gas turbine outlet pressure and flue gas adiabatic index are calculated flue gas turbine theoretical power;When calculating the mass flow of flue gas under standard state, double-acting slide valve opening is used as input variable;B, in the electric state of main motor, constructs flue gas turbine shaft power calculation model, by main fan shaft power, gear box power consumption data, coupling power consumption data and main motor output power, calculate flue gas turbine shaft power;C, the ratio of flue gas turbine shaft power and flue gas turbine theoretical power is calculated flue gas turbine total efficiency;The ratio of flue gas turbine shaft power and main fan shaft power is calculated flue gas energy recovery rate;Flue gas turbine total efficiency, flue gas energy recovery rate and flue gas turbine adiabatic efficiency are used to carry out real-time monitoring to the comprehensive condition of flue gas turbine unit.

Description

Technical Field

[0001] This invention relates to the field of energy efficiency monitoring technology for large-scale petrochemical units, and in particular to a method, system, electronic equipment, and storage medium for real-time monitoring of the comprehensive status of a flue gas turbine unit. Background Technology

[0002] For a long time, sufficient attention has been paid to energy-saving optimization of production processes, but insufficient attention has been paid to energy conservation of equipment. In fact, equipment energy consumption accounts for a high proportion of the energy consumption structure of a plant. Taking the catalytic cracking unit, which has the highest energy consumption in the oil refining process, as an example, the energy consumption of its large units and pumps accounts for about 11% of the total energy consumption of the catalytic cracking unit. Therefore, it is very necessary to do a good job in equipment energy conservation.

[0003] The flue gas turbine-main fan-motor / generator unit, as the main energy recovery equipment in the catalytic cracking unit, is the core equipment of the unit. After separation and purification, the flue gas from the catalytic cracking process enters the flue gas turbine through a high-temperature flue gas butterfly valve to expand and perform work, and the energy generated is recovered by the flue gas turbine. The flue gas butterfly valve and double-acting slide valve installed in the flue gas passage are the main devices for regulating the regenerator pressure or controlling the reactor, regenerator differential pressure, and flue gas turbine speed. The main fan is generally an adjustable-blade axial flow fan. By controlling the adjustable blades, the fan airflow is automatically adjusted to effectively meet production needs. The flue gas turbine recovers energy from the flue gas, converting the thermal and pressure energy of the flue gas into kinetic energy, and then directly transfers the energy to the fan through the shaft to perform work. When the energy recovered by the flue gas turbine is less than the energy consumed by the fan, the motor operates in motor mode; otherwise, the motor operates in generator mode.

[0004] The energy efficiency of flue gas turbine units directly affects the energy consumption of the entire unit. Flue gas turbine units have complex structures and operating principles, with numerous operating parameters and strong inter-parameter interactions. Currently, there is a lack of accurate online real-time energy efficiency monitoring technology for flue gas turbine units. This makes it impossible to conduct timely horizontal comparisons of energy efficiency between different units using the same unit, and it is also inconvenient to understand the historical trends of the unit's energy consumption. Energy efficiency management lacks a clear objective, sense of urgency, and optimization guidance, hindering the improvement of unit energy efficiency. Among flue gas turbine units, the economic evaluation of the operation of the flue gas turbine and main fan is particularly important. Furthermore, when calculating the shaft power of the flue gas turbine, relevant parameters of the main motor must also be considered. Therefore, when evaluating the overall condition of a flue gas turbine unit, a comprehensive consideration of its parameter indicators is necessary.

[0005] While existing technologies also include monitoring techniques for the energy efficiency of flue gas turbine units, such as the article "Efficiency Analysis of Flue Gas Turbine Units in Catalytic Cracking Plants" published in *Shandong Chemical Industry* (July 2014), which proposed a calculation method for the efficiency of flue gas turbine units (main fan + flue gas turbine + motor / generator) in catalytic cracking plants, and applied it to a refinery with a 3.0 × 10⁻⁶ efficiency... 6The calculations and analysis were performed on the flue gas turbine of the t / a catalytic cracking unit. However, the consideration of operating parameters such as process parameters and flue gas composition obtained online was not comprehensive, making it difficult to obtain real-time and accurate evaluation results of the energy efficiency and economy of the flue gas turbine unit. In addition, the scheme did not comprehensively evaluate the overall status of the unit from aspects such as flue gas energy recovery rate and flue gas turbine adiabatic efficiency.

[0006] Therefore, there is an urgent need for a method and system for real-time monitoring of the comprehensive status of flue gas turbine units. This system can acquire the operating parameters of the flue gas turbine units (including process parameters and flue gas composition) online and input them into relevant calculation models to achieve real-time and accurate evaluation results of the energy efficiency and economy of the flue gas turbine units.

[0007] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a method and system for real-time monitoring of the comprehensive status of a flue gas turbine unit. By acquiring the operating parameters of the flue gas turbine unit (including process parameters and flue gas composition, etc.) online and inputting them into a relevant calculation model, the method can achieve real-time and accurate evaluation results of the energy efficiency and economy of the flue gas turbine unit.

[0009] To achieve the above objectives, according to a first aspect of the present invention, the present invention provides a method for real-time monitoring of the comprehensive status of a flue gas turbine unit, comprising the following steps: A. Constructing a theoretical power calculation model for the flue gas turbine, calculating the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the flue gas turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas; when calculating the mass flow rate of the flue gas under standard conditions, using the opening degree of the double-acting slide valve as an input variable. B. With the main motor in motored mode, construct a flue gas turbine shaft power calculation model, and calculate the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and main motor output power. C. Calculate the total efficiency of the flue gas turbine using the ratio of its shaft power to the theoretical power of the flue gas turbine; calculate the flue gas energy recovery rate using the ratio of its shaft power to the main fan shaft power; and monitor the overall status of the flue gas turbine unit in real time using the total efficiency of the flue gas turbine, the flue gas energy recovery rate, and the flue gas turbine adiabatic efficiency.

[0010] Furthermore, in the above technical solution, the theoretical power calculation model for the flue gas turbine can be specifically as follows:

[0011] N 理 =G e ·C p ·T1·[1-(P2 / P1)(K 烟-1) / K 烟 ];

[0012] Among them, G e The mass flow rate of the flue gas entering the flue gas turbine under standard conditions, expressed in kg / s; C p ρ is the specific heat capacity of the mixed flue gas at constant pressure, kJ / (kg·K); T1 is the inlet temperature of the flue gas turbine, K; P1 is the inlet pressure of the flue gas turbine, MPa(a); P2 is the outlet pressure of the flue gas turbine, MPa(a); K 烟 The adiabatic index of flue gas.

[0013] Furthermore, in the above technical solution, the mass flow rate G of the flue gas entering the flue gas turbine under standard conditions... e It can be obtained by calculation as follows:

[0014]

[0015] Where, ρ 烟 The density of flue gas under standard conditions, kg / Nm³ 3 V1 is the volumetric flow rate of the flue gas entering the flue gas turbine under standard conditions, in Nm³. 3 / min; V'1 is the volumetric flow rate of the main fan under standard conditions, Nm³ 3 / min; γ A —Double-acting spool valve A opening degree, %; γ B For the opening degree of the double-acting spool valve B, %.

[0016] Furthermore, in the above technical solution, the specific heat capacity C of the mixed flue gas at constant pressure p It can be obtained by calculation as follows:

[0017] C p =∑C pi ·Y i / 100;

[0018] Among them, C pi Y is the average isobaric specific heat capacity of the i-th component, in kJ / (kg·K); i Let m be the mass content of the i-th component.

[0019] Furthermore, in the above technical solution, the calculation model for the flue gas turbine shaft power can be specifically as follows:

[0020] N e =N c +N g +N p -N m ;

[0021] Where, N c Main fan shaft power, kW; N gPower consumption of the gearbox, kW; N p Power consumption of the coupling, kW; N m The main motor output power is expressed in kW.

[0022] Furthermore, in the above technical solution, the main fan shaft power N c It can be obtained by calculation as follows:

[0023]

[0024] Wherein, T′1 is the main fan inlet pressure, MPa(a); T′2 is the main fan outlet pressure, MPa(a); V1″ is the main fan inlet corrected volumetric flow rate, m³ / s. 3 / min; m is the variable index of the main fan; η pol The main fan has variable efficiency; η m The main fan mechanical efficiency.

[0025] Furthermore, in the above technical solution, the corrected volumetric flow rate V1″ at the main fan inlet can be:

[0026]

[0027] Wherein, V1′ is the volumetric flow rate of the main fan under standard conditions, in Nm³. 3 / min; T′1 is the inlet temperature of the main fan, k.

[0028] Furthermore, in the above technical solution, the variable efficiency η of the main fan... pol It can be:

[0029]

[0030] Wherein, P′1 is the main fan inlet pressure, MPa(a); P′2 is the main fan outlet pressure, MPa(a); T′2 is the main fan outlet temperature, k; T′1 is the main fan inlet temperature, k; K 空 The air insulation index is 1.4.

[0031] Furthermore, in the above technical solution, the main motor output power N m Specifically, it can be:

[0032] N m =N 电入 -N 电损 ;

[0033] Where, N 电入 Main motor input power, kW; N 电损 The main motor power loss is expressed in kW.

[0034] Furthermore, in the above technical solution, the overall efficiency of the flue gas turbine in step C is:

[0035]

[0036] Where, N e N is the shaft power of the flue gas turbine. 理 This represents the theoretical power of the flue gas turbine.

[0037] The adiabatic efficiency of the flue gas turbine in step C is:

[0038]

[0039] Where T1 is the flue gas turbine inlet temperature, K; T2 is the flue gas turbine outlet temperature, K; P1 is the flue gas turbine inlet pressure, MPa(a); P2 is the flue gas turbine outlet pressure, MPa(a); K 烟 The adiabatic index of flue gas;

[0040] The flue gas energy recovery rate in step C is:

[0041]

[0042] Where, N e The power of the flue gas turbine shaft is expressed in kW and N. c The main fan shaft power is expressed in kW.

[0043] According to a second aspect of the present invention, the present invention provides a real-time monitoring system for the integrated status of a flue gas turbine unit, comprising: a flue gas turbine theoretical power calculation module, which is used to construct a flue gas turbine theoretical power calculation model, and calculate the theoretical power of the flue gas turbine by means of the mass flow rate of the flue gas entering the flue gas turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the flue gas turbine inlet temperature, the flue gas turbine inlet pressure, the flue gas turbine outlet pressure, and the flue gas adiabatic index; when calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable; and a flue gas turbine shaft power calculation module. The first module is used to construct a model for calculating the shaft power of the flue gas turbine when the main motor is in electric mode. It calculates the shaft power of the flue gas turbine using the shaft power of the main fan, the power consumption data of the gearbox, the power consumption data of the coupling, and the output power of the main motor. The second module is used to calculate the overall efficiency of the flue gas turbine by using the ratio of the shaft power of the flue gas turbine to the theoretical power of the flue gas turbine; calculate the flue gas energy recovery rate by using the ratio of the shaft power of the flue gas turbine to the shaft power of the main fan; and monitor the overall status of the flue gas turbine unit in real time using the overall efficiency of the flue gas turbine, the flue gas energy recovery rate, and the adiabatic efficiency of the flue gas turbine.

[0044] According to a third aspect of the present invention, an electronic device is provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform a method for real-time monitoring of the comprehensive status of a tobacco processing unit as described in any of the above technical solutions.

[0045] According to a fourth aspect of the present invention, the present invention provides a non-transitory computer-readable storage medium storing computer-executable instructions for causing a computer to execute a method for real-time monitoring of the comprehensive status of a tobacco generator unit as described in any of the above-described technical solutions.

[0046] Compared with the prior art, the present invention has one or more of the following beneficial effects:

[0047] 1) This invention acquires the operating parameters of the flue gas turbine unit (including process parameters and flue gas composition, etc.) online in real time and inputs them into the relevant flue gas turbine theoretical power calculation model and flue gas turbine shaft power calculation model. This enables real-time monitoring of the comprehensive status of the flue gas turbine unit and obtains real-time and accurate evaluation results of the economic efficiency of the flue gas turbine unit.

[0048] 2) The inventors discovered through research that the opening degree of the double-acting slide valve has a certain impact on the flue gas volume flow rate. If this parameter is not considered, it will affect the calculation of the flue gas mass flow rate, and ultimately affect the accuracy of the theoretical power calculation of the flue gas hood. Therefore, this invention incorporates the collected opening degree data of the double-acting slide valve into the calculation of the flue gas mass flow rate, which can further improve the accuracy of the theoretical power calculation of the flue gas hood;

[0049] 3) This invention can not only use the calculation results of the theoretical power and shaft power of the flue gas turbine to further calculate the comprehensive status indicators of the flue gas turbine unit in real time, such as the total efficiency, adiabatic efficiency, and flue gas energy recovery rate, but also calculate and output other energy efficiency indicators such as the real-time power and efficiency of the main fan and the flue gas turbine during the calculation and output of the above three comprehensive status indicators. In this way, the operating economy of the main fan and the operating economy of the flue gas turbine can be effectively evaluated.

[0050] 4) The present invention can also use the data of the above energy efficiency indicators to make horizontal and vertical comparisons of key indicators of the overall status of the tobacco machine unit, such as instantaneous horizontal comparison of the overall status indicators of tobacco machine units of different users and vertical comprehensive status analysis and comparison of the same equipment.

[0051] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0052] Figure 1 This is a flowchart illustrating the real-time monitoring method for the comprehensive status of the tobacco processing unit according to the present invention.

[0053] Figure 2 This is a schematic diagram of the structure of the real-time monitoring system for the comprehensive status of the tobacco processing unit of the present invention.

[0054] Figure 3 This is a schematic diagram of the electronic equipment structure for the real-time monitoring method of the comprehensive status of tobacco generator units according to the present invention. Detailed Implementation

[0055] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0056] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0057] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “up,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0058] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0059] The methods, systems, electronic devices, and storage media of the present invention are described in more detail below by way of specific embodiments. It should be understood that the embodiments are merely exemplary and the present invention is not limited thereto.

[0060] The inventors discovered through research that the flue gas turbine-main blower-main motor (electric motor / generator) unit is the core equipment of a catalytic cracking unit, and its energy efficiency directly affects the unit's energy consumption. The flue gas turbine unit has a complex structure and operating principle, with numerous operating parameters and strong inter-parameter coupling. However, existing technologies lack effective online and relatively accurate energy efficiency monitoring methods. In the flue gas turbine unit of this invention, the economic evaluation of the operation of the flue gas turbine and main blower is particularly important. Furthermore, when calculating the shaft power of the flue gas turbine, relevant parameters of the main motor must also be considered. Therefore, when evaluating the overall state of the flue gas turbine unit, a comprehensive consideration of its parameter indicators is necessary.

[0061] Further research by the inventors revealed that the primary function of the double-acting slide valve is to control the pressure of the regenerator by adjusting its opening, maintaining the pressure difference between the regenerator and the reactor at a stable value. In actual production, the reactor pressure can fluctuate. The opening of the double-acting slide valve is based on the signal of changes in the differential pressure between the two reactors, rather than solely on the pressure signal from the regenerator. Besides regulating the differential pressure, the double-acting slide valve can also be used to vent air in case of an accident to prevent overpressure in the regenerator. Therefore, the opening of the double-acting slide valve has a certain impact on the flue gas volumetric flow rate. Ignoring this parameter will affect the calculation of the flue gas mass flow rate, ultimately impacting the accuracy of the theoretical power calculation of the flue gas turbine.

[0062] Example 1

[0063] like Figure 1 As shown in the figure, this embodiment provides a method for real-time monitoring of the comprehensive status of a flue gas turbine unit. It mainly involves real-time collection of relevant operating parameters of the flue gas turbine unit (including process parameters and flue gas composition) and real-time calculation. Finally, it uses key indicators such as the total efficiency of the flue gas turbine and the flue gas energy recovery rate to monitor and evaluate the comprehensive status of the flue gas turbine unit in real time. The method includes the following steps:

[0064] Step S101: Construct a theoretical power calculation model for the flue gas turbine. The theoretical power of the flue gas turbine is calculated using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas. It is important to emphasize that when calculating the mass flow rate of the flue gas under standard conditions, this invention uses the opening degree of the double-acting slide valve as one of the input variables. During the calculation process, it is necessary to retrieve the measured input variable parameters and some input constants from the real-time database. The specific implementation process of this step is as follows:

[0065] The theoretical power calculation model for the flue gas turbine is as follows:

[0066] N 理 =G e ·C p ·T1·[1-(P2 / P1) (K烟-1) / K 烟 ]; Formula (1);

[0067] In formula (1), G e The mass flow rate of the flue gas entering the flue gas turbine under standard conditions, expressed in kg / s; C p 1 is the specific heat capacity of the mixed flue gas at constant pressure, kJ / (kg·K); T1 is the inlet temperature of the flue gas turbine (which can be acquired through a real-time database), K; P1 is the inlet pressure of the flue gas turbine (which can be acquired through a real-time database), MPa(a); P2 is the outlet pressure of the flue gas turbine (which can be acquired through a real-time database), MPa(a); K 烟 The adiabatic index of flue gas is typically taken as 1.313.

[0068] Furthermore, G in formula (1) e It can be calculated in the following ways (i.e., formulas 2 to 4):

[0069] G e =ρ 烟 ·V1 / 60; Formula (2);

[0070] In formula (2), ρ 烟 The density of flue gas under standard conditions, kg / Nm³ 3 V1 represents the volumetric flow rate of the flue gas entering the flue gas turbine under standard conditions, in Nm³. 3 / min. The flue gas density can be calculated using the following formula:

[0071] ρ 烟 =∑M i ·Y i / (100·22.4); Formula (3);

[0072] In formula (3), M i Y is the molecular weight of the i-th component; i Let (v) represent the molar content of the i-th component.

[0073]

[0074] In formula (4), V1′ is the volumetric flow rate of the main fan under standard conditions, in Nm³. 3 / min; γ A —Double-acting spool valve A opening degree, %; γ BThe percentage represents the opening degree of the double-acting slide valve B. It should be noted that this embodiment, when calculating the mass flow rate of the flue gas entering the flue gas turbine under standard conditions, fully considers the influence of the opening degree of the double-acting slide valves on the volumetric flow rate of the flue gas. By introducing the opening degree data of double-acting slide valves A and B, the accuracy of the final theoretical power calculation of the flue gas turbine can be effectively guaranteed. It should be noted that the maximum flow rate of the flue gas passing through the flue gas turbine is the rated flow rate of the flue gas turbine. If the calculated flow rate is greater than the rated flow rate of the flue gas turbine, it should be calculated according to the rated flow rate of the flue gas turbine.

[0075] Furthermore, C in formula (1) p It can be calculated in the following ways (i.e., formulas 5 to 8):

[0076] C p =∑C pi ·Y i / 100; Formula (5);

[0077] In formula (5), C pi Y is the average isobaric specific heat capacity of the i-th component, in kJ / (kg·K); i Let m be the mass content of the i-th component, (m)%. This mass content data can be obtained from the refinery's LIMS real-time analysis data.

[0078] C pi =(C pi入 +C pi出 ) / 2; Formula (6);

[0079] In formula (6), C pi入 C is the isobaric specific heat capacity of the i-th component at the inlet temperature T1 of the flue gas machine (which can be retrieved from the real-time database), in kJ / (kg·k); pi出 Let T2 be the isobaric specific heat capacity of the i-th component at the outlet temperature T2 of the smoke machine (which can be retrieved from the real-time database), in kJ / (kg·k).

[0080] C pi入 =a+bT1·10 -3 +cT1 2 ·10 -6 ; Formula (7);

[0081] C pi出 =a+bT2·10 -3 +cT2 2 ·10 -6 ; Formula (8);

[0082] In formulas (7) and (8), the constants for different components are shown in Table 1:

[0083] Table 1. Isobaric specific heat constants of different components in flue gas

[0084] Components a b c <![CDATA[O2]]> 28.17 6.297 -0.7494 <![CDATA[N2]]> 27.32 6.226 -0.9502 <![CDATA[CO2]]> 26.75 42.258 -14.25

[0085] Thus far, step S101 has completed the calculation of the theoretical power of the flue gas turbine in formula (1) by constructing the calculation model and collecting and substituting the operating parameters.

[0086] Step S102: With the main motor in motored mode, construct a flue gas turbine shaft power calculation model. Calculate the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and main motor output power. It should be noted that the main motor is in motored mode when the energy recovered by the flue gas turbine is less than the energy consumed by the main fan; it is in generator mode when the energy recovered by the flue gas turbine is greater than the energy consumed by the main fan. This step only considers the flue gas turbine shaft power calculation when the main motor is in motored mode.

[0087] The specific model for calculating the flue gas turbine shaft power in this step is as follows:

[0088] N e =N c +N g +N p -N m ; Formula (9);

[0089] In formula (9), N c Main fan shaft power, kW; N g Power consumption of the gearbox, kW; N p Power consumption of the coupling, kW; N m The main motor output power is expressed in kW.

[0090] Furthermore, the main fan shaft power N in formula (9) c (That is, the actual power consumption of the main fan) can be calculated in the following way:

[0091]

[0092] In formula (10), P′1 is the main fan inlet pressure, MPa (a); P′2 is the main fan outlet pressure, MPa (a); V1″ is the main fan inlet corrected volumetric flow rate, m³ / s. 3 / min; m is the variable index of the main fan; η pol The main fan has variable efficiency; η m The main fan mechanical efficiency.

[0093] The corrected volumetric flow rate V1″ at the main fan inlet is:

[0094]

[0095] In formula (11), V1′ is the volumetric flow rate of the main fan under standard conditions, in Nm³. 3 / min; T′1 is the inlet temperature of the main fan, k.

[0096] The variability index m of the main fan is:

[0097]

[0098] In formula (12), T′2 is the outlet temperature of the main fan, k; T′1 is the inlet temperature of the main fan, k.

[0099] Variable efficiency η of main fan pol for:

[0100]

[0101] In formula (13), P′1 is the inlet pressure of the main fan, MPa (a); P′2 is the outlet pressure of the main fan, MPa (a); T′2 is the outlet temperature of the main fan, k; T′1 is the inlet temperature of the main fan, k; K 空 The air insulation index is 1.4.

[0102] Furthermore, the main motor output power N in formula (9) m Specifically:

[0103] N m =N 电入 -N 电损 ; Formula (14);

[0104] In formula (14), N 电入 Main motor input power, kW; N 电损 The main motor power loss is expressed in kW.

[0105] The main motor input power is:

[0106]

[0107] In formula (15), U is the rated voltage of the main motor, U = 10kV; I is the operating current of the main motor, A; This is the main motor power factor (full load; motor data can be retrieved from the database).

[0108] The power loss of the main motor is:

[0109]

[0110] In formula (16), N0 is the no-load power of the main motor (which does not change with the motor load), kW; N 额 Rated power of the main motor (can be found in motor data), kW; N铜 The maximum copper loss and stray loss of the main motor under full load (varying with motor load) are in kW.

[0111] The no-load power of the main motor is:

[0112]

[0113] In formula (17), The no-load power factor of the main motor (can be retrieved from motor data), for example, the no-load power factor of an 18000kW motor is 0.15.

[0114] The maximum copper loss and stray loss of the main motor under full load are:

[0115] N 铜 =N 满0 -N0 formula (18);

[0116] In formula (18), N 满0 This represents the power consumed by the main motor itself when fully loaded, in kW.

[0117] The power consumed by the main motor itself when fully loaded is:

[0118] N 满0 =N 有入 -N 有出 Formula (19);

[0119] In formula (19), N 有入 Input active power of the main motor at full load, kW; N 有出 The active power output of the main motor at full load is expressed in kW.

[0120] The input active power of the main motor at full load is:

[0121]

[0122] In formula (20), I 额 The rated current of the main motor (can be found in the motor's factory data), A.

[0123] The main motor outputs active power at full load as follows:

[0124] N 有出 =N 有入 ·η 满 Formula (21);

[0125] In formula (21), η 满 This is the motor's full-load efficiency (you can retrieve the motor's factory data).

[0126] Furthermore, the power consumption data of the gearbox in formula (9) is as follows:

[0127] N g =N m ·(1-η 齿 ) formula (22);

[0128] In formula (22), η 齿 For gearbox efficiency, η 齿 =0.985

[0129] Furthermore, the power consumption data of the coupling in formula (9) is as follows:

[0130] N p =N c ·(1-η 联 ) formula (23);

[0131] In formula (23), η 联 For coupling efficiency, η 联 =0.99.

[0132] Thus far, step S102 has completed the calculation of the flue gas turbine shaft power in formula (9) using the constructed calculation model and the collected and substituted operating parameters.

[0133] Step S103: The overall efficiency of the flue gas turbine is calculated using the ratio of the flue gas turbine shaft power obtained in step S102 to the theoretical power of the flue gas turbine obtained in step S101; the flue gas energy recovery rate is calculated using the ratio of the flue gas turbine shaft power to the main fan shaft power obtained in step S102; and the adiabatic efficiency of the flue gas turbine is calculated using the flue gas turbine inlet and outlet temperatures, flue gas turbine inlet and outlet pressures, and the flue gas adiabatic index. This invention allows for real-time evaluation of the overall status of the flue gas turbine unit using these three indicators.

[0134] Specifically, the overall efficiency of the flue gas turbine is:

[0135]

[0136] Where, N e N is the shaft power of the flue gas turbine. 理 The theoretical power of the flue gas turbine is the ideal power output when the flue gas entering the turbine expands according to an ideal adiabatic process to reach the same outlet pressure.

[0137] The adiabatic efficiency of the flue gas turbine is:

[0138]

[0139] In formula (25), T1 is the inlet temperature of the flue gas turbine, k; T2 is the outlet temperature of the flue gas turbine, k; P1 is the inlet pressure of the flue gas turbine, MPa (a); P2 is the outlet pressure of the flue gas turbine, MPa (a); K烟 The adiabatic index of flue gas.

[0140] The flue gas energy recovery rate is:

[0141]

[0142] Where, N e The power of the flue gas turbine shaft is expressed in kW and N. c The main fan shaft power is expressed in kW.

[0143] The constants and real-time process parameter variables involved in the above calculation model of this embodiment are summarized in Tables 2 and 3 below.

[0144] Table 2 Model Input Constants Table

[0145]

[0146]

[0147] Table 3. Model Input Process Variables Table

[0148] Serial Number project symbol unit numerical values Data source 1 Range hood inlet temperature <![CDATA[t1]]> ℃ Real-time changes Real-time database 2 Smoke hood outlet temperature <![CDATA[t2]]> ℃ Real-time changes Real-time database 3 Smoke hood inlet pressure <![CDATA[p1]]> MPa(g) Real-time changes Real-time database 4 Smoke machine outlet pressure <![CDATA[p2]]> MPa(g) Real-time changes Real-time database 5 Double-acting spool valve A opening degree <![CDATA[γ A ]]> ％ Real-time changes Real-time database 6 Double-acting slide valve B opening degree <![CDATA[γ B ]]> ％ Real-time changes Real-time database 7 Main fan inlet temperature <![CDATA[t1’]]> ℃ Real-time changes Real-time database 8 Main fan outlet temperature <![CDATA[t2’]]> ℃ Real-time changes Real-time database 9 Main fan inlet pressure <![CDATA[p1’]]> MPa(g) Real-time changes Real-time database 10 Main fan outlet pressure <![CDATA[p2’]]> MPa(g) Real-time changes Real-time database 11 Main airflow <![CDATA[V1’]]> <![CDATA[Nm 3 / min]]> Real-time changes Real-time database 12 Motor operating current I A Real-time changes Real-time database 13 <![CDATA[O2 content in flue gas]]> ％(v) Real-time changes LIMS 14 <![CDATA[N2 content in flue gas]]> ％(v) Real-time changes LIMS 15 <![CDATA[CO2 content in flue gas]]> ％(v) Real-time changes LIMS

[0149] Using the constants in Table 2 and the real-time process variable data in Table 3, the energy efficiency index in step S103 of this embodiment can be calculated in real time. At the same time, other energy efficiency indexes such as the real-time power and efficiency of the main fan and flue gas turbine can also be calculated. See Table 4 for details.

[0150] Table 4 Real-time power and efficiency output values ​​of main fan and flue gas turbine

[0151]

[0152]

[0153] The economic efficiency of the main fan operation can be evaluated based on the output results in Table 4 above, as shown in Table 5.

[0154] Table 5. Economic Evaluation Standards for Main Fan Operation

[0155] Serial Number <![CDATA[Variable efficiency (η pol )]]> Evaluation results 1 <![CDATA[η pol ≥0.75]]> Operating Economy 2 <![CDATA[0.7≤η pol <0.75]]> Reasonable operation 3 <![CDATA[η pol <0.7]]> Uneconomical

[0156] The economic efficiency of flue gas turbine operation can also be evaluated using the output results in Table 4 above, as shown in Table 6.

[0157] Table 6. Economic Evaluation Standards for Smoke Hood Operation

[0158] Serial Number <![CDATA[Variable efficiency (η 总 )]]> Evaluation results 1 <![CDATA[η 总 ≥0.65]]> Operating Economy 2 <![CDATA[0.6≤η 总 <0.65]]> Reasonable operation 3 <![CDATA[η 总 <0.6]]> Uneconomical

[0159] Based on the output results in Table 4 above, we can also make horizontal and vertical comparisons of key energy efficiency indicators, such as instantaneous horizontal comparisons of the comprehensive status indicators of different user groups of smoke machine units and vertical comprehensive status analysis comparisons of the same equipment, which will not be detailed here.

[0160] Example 2

[0161] Combination Figure 2 As shown, this embodiment provides a real-time monitoring system for the comprehensive status of a flue gas turbine unit, including a flue gas turbine theoretical power calculation module 201, a flue gas turbine shaft power calculation module 202, and a comprehensive status assessment module 203. The flue gas turbine theoretical power calculation module 201 is used to construct a theoretical power calculation model for the flue gas turbine. It calculates the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas. When calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable. The flue gas turbine shaft power calculation module 202 is used to construct a flue gas turbine shaft power calculation model when the main motor is in electric mode. It calculates the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and the main motor output power. The comprehensive status assessment module 203 is used to calculate the overall efficiency of the flue gas turbine by the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine; to calculate the flue gas energy recovery rate by the ratio of the flue gas turbine shaft power to the main fan shaft power; and to monitor the comprehensive status of the flue gas turbine unit in real time by the overall efficiency of the flue gas turbine, the flue gas energy recovery rate, and the flue gas turbine adiabatic efficiency. This embodiment is a system embodiment corresponding to method embodiment 1, and can achieve the same technical effects as embodiment 1.

[0162] Example 3

[0163] This embodiment provides a non-transitory (non-volatile) computer storage medium storing computer-executable instructions that can execute the methods in any of the above method embodiments and achieve the same technical effect. The method includes: A) Constructing a theoretical power calculation model for the flue gas turbine, calculating the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas; when calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable; B) Constructing a flue gas turbine shaft power calculation model under the condition that the main motor is in motor mode, calculating the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and the output power of the main motor; C) Calculating the total efficiency of the flue gas turbine using the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine; calculating the flue gas energy recovery rate using the ratio of the flue gas turbine shaft power to the main fan shaft power; and monitoring the overall status of the flue gas turbine unit in real time using the total efficiency of the flue gas turbine, the flue gas energy recovery rate, and the adiabatic efficiency of the flue gas turbine.

[0164] Example 4

[0165] This embodiment provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, which, when executed by a computer, cause the computer to perform the methods described in the above aspects and achieve the same technical effects. The method includes: A) Constructing a theoretical power calculation model for the flue gas turbine, calculating the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas; when calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable; B) Constructing a flue gas turbine shaft power calculation model under the condition that the main motor is in motor mode, calculating the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and the output power of the main motor; C) Calculating the total efficiency of the flue gas turbine using the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine; calculating the flue gas energy recovery rate using the ratio of the flue gas turbine shaft power to the main fan shaft power; and monitoring the overall status of the flue gas turbine unit in real time using the total efficiency of the flue gas turbine, the flue gas energy recovery rate, and the adiabatic efficiency of the flue gas turbine.

[0166] Example 5

[0167] Figure 3This is a schematic diagram of the hardware structure of the electronic device in Embodiment 5. The device includes one or more processors 610 and a memory 620. Taking one processor 610 as an example, the device may also include an input device 630 and an output device 640.

[0168] The processor 610, memory 620, input device 630 and output device 640 can be connected by a bus or other means.

[0169] The memory 620, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules. The processor 610 executes various functional applications and data processing of the electronic device by running the non-transitory software programs, instructions, and modules stored in the memory 620, thereby implementing the processing method of the above-described method embodiments.

[0170] The memory 620 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and applications required for at least one function; the data storage area may store data, etc. Furthermore, the memory 620 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 620 may optionally include memory remotely located relative to the processor 610, and these remote memories may be connected to the processing device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0171] Input device 630 can receive input digital or character information and generate signal input. Output device 640 may include display devices such as a display screen.

[0172] The one or more modules are stored in the memory 620. When executed by the one or more processors 610, they perform the following: A. Constructing a theoretical power calculation model for the flue gas turbine, calculating the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas; when calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable; B. A) With the main motor in motored mode, a model for calculating the flue gas turbine shaft power is constructed. The flue gas turbine shaft power is calculated using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and main motor output power. B) The total efficiency of the flue gas turbine is calculated using the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine. The flue gas energy recovery rate is calculated using the ratio of the flue gas turbine shaft power to the main fan shaft power. The overall status of the flue gas turbine unit is monitored in real time using the total efficiency of the flue gas turbine, the flue gas energy recovery rate, and the flue gas turbine adiabatic efficiency.

[0173] The above-described product can execute the methods provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in other embodiments of the present invention.

[0174] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0175] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0176] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. Any simple modifications, equivalent changes, and alterations made to the foregoing exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A method for real-time monitoring of the overall status of a tobacco processing unit, characterized in that, Includes the following steps: A. Construct a theoretical power calculation model for the flue gas turbine. Calculate the theoretical power of the flue gas turbine using the mass flow rate of the flue gas entering the turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas. When calculating the mass flow rate of the flue gas under standard conditions, use the opening degree of the double-acting slide valve as an input variable. The specific theoretical power calculation model for the flue gas turbine is as follows: ； in, The mass flow rate of the flue gas entering the flue gas turbine under standard conditions, expressed in kg / s; The isobaric specific heat capacity of the mixed flue gas is given in kJ / (kg·k). The inlet temperature of the flue gas turbine is K; The inlet pressure of the flue gas turbine is MPa(a). The outlet pressure of the flue gas turbine is MPa(a). The adiabatic index of flue gas; The mass flow rate of the flue gas entering the flue gas turbine under standard conditions It is obtained through the following calculation method: ； ； in, The density of flue gas under standard conditions, kg / Nm³ 3 ; The volumetric flow rate (Nm³) of the flue gas entering the flue gas turbine under standard conditions. 3 / min; Volumetric flow rate of the main fan under standard conditions, Nm 3 / min; —Opening degree of double-acting spool valve A, % For the opening degree of the double-acting spool valve B, % B. With the main motor in electric mode, construct a flue gas turbine shaft power calculation model, and calculate the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and main motor output power. C. Calculate the overall efficiency of the flue gas turbine by the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine; calculate the flue gas energy recovery rate by the ratio of the flue gas turbine shaft power to the main fan shaft power; and monitor the overall status of the flue gas turbine unit in real time by the overall efficiency of the flue gas turbine, the flue gas energy recovery rate, and the flue gas turbine adiabatic efficiency.

2. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 1, characterized in that, The specific heat capacity at constant pressure of the mixed flue gas It is obtained through the following calculation method: ； in, Let be the average isobaric specific heat capacity of the i-th component, in kJ / (kg·k). Let m be the mass content of the i-th component.

3. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 1, characterized in that, The specific model for calculating the shaft power of the flue gas turbine is as follows: ； in, Main fan shaft power, kW; The power consumption of the gearbox is expressed in kW. The power consumption of the coupling is expressed in kW. The main motor output power is expressed in kW.

4. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 3, characterized in that, The main fan shaft power It is obtained through the following calculation method: ； in, The main fan inlet pressure, MPa(a); Main fan outlet pressure, MPa(a); Corrected volumetric flow rate at the main fan inlet, m 3 / min; The main fan variable index; The main fan has variable efficiency; The main fan mechanical efficiency.

5. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 4, characterized in that, The corrected volumetric flow rate at the main fan inlet for: ； in, Volumetric flow rate of the main fan under standard conditions, Nm 3 / min; The main fan inlet temperature, in K.

6. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 4, characterized in that, The variable efficiency of the main fan for: ； in, The main fan inlet pressure, MPa(a); Main fan outlet pressure, MPa(a); Main fan outlet temperature, K; Main fan inlet temperature, K; The air insulation index is 1.

4.

7. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 3, characterized in that, The main motor output power Specifically: ； in, Main motor input power, kW; The main motor power loss is expressed in kW.

8. The method for real-time monitoring of the comprehensive status of a tobacco processing unit according to claim 1, characterized in that, The overall efficiency of the flue gas turbine in step C is: ； in, This refers to the shaft power of the flue gas turbine. This represents the theoretical power of the flue gas turbine. The adiabatic efficiency of the flue gas turbine in step C is: ； in, The inlet temperature of the flue gas turbine is K; T 2 The outlet temperature of the flue gas turbine, in K; The inlet pressure of the flue gas turbine is MPa(a). The outlet pressure of the flue gas turbine is MPa(a). The adiabatic index of flue gas; The flue gas energy recovery rate in step C is: ； in, The power of the flue gas turbine shaft is expressed in kW. The main fan shaft power is expressed in kW.

9. A real-time monitoring system for the comprehensive status of a tobacco processing unit, characterized in that, The method described in any one of claims 1 to 8 includes: The flue gas turbine theoretical power calculation module is used to construct a theoretical power calculation model for the flue gas turbine. It calculates the theoretical power of the flue gas turbine by using the mass flow rate of the flue gas entering the flue gas turbine under standard conditions, the specific heat capacity of the mixed flue gas at constant pressure, the inlet temperature of the flue gas turbine, the inlet pressure of the flue gas turbine, the outlet pressure of the flue gas turbine, and the adiabatic index of the flue gas. When calculating the mass flow rate of the flue gas under standard conditions, the opening degree of the double-acting slide valve is used as an input variable. The flue gas turbine shaft power calculation module is used to construct a flue gas turbine shaft power calculation model when the main motor is in electric mode. It calculates the flue gas turbine shaft power using the main fan shaft power, gearbox power consumption data, coupling power consumption data, and main motor output power. The comprehensive status assessment module is used to calculate the total efficiency of the flue gas turbine by the ratio of the flue gas turbine shaft power to the theoretical power of the flue gas turbine; to calculate the flue gas energy recovery rate by the ratio of the flue gas turbine shaft power to the main fan shaft power; and to monitor the comprehensive status of the flue gas turbine unit in real time by the total efficiency of the flue gas turbine, the flue gas energy recovery rate, and the flue gas turbine adiabatic efficiency.

10. 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, which, when executed by the at least one processor, causes the at least one processor to perform the real-time monitoring method for the comprehensive status of the tobacco machine unit as described in any one of claims 1 to 8.

11. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer-executable instructions, which are used to cause the computer to execute the real-time monitoring method for the comprehensive status of the tobacco generator unit as described in any one of claims 1 to 8.

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