CN-117994874-B - Method and system for monitoring comprehensive state of smoke machine unit in real time, electronic equipment and storage medium

CN117994874BCN 117994874 BCN117994874 BCN 117994874BCN-117994874-B

Abstract

The invention discloses a method and a system for monitoring the comprehensive state of a smoke machine unit in real time, wherein the method comprises the steps of A, constructing a theoretical power calculation model of a smoke turbine, and calculating the theoretical power of the smoke turbine through the mass flow of smoke entering the smoke turbine in a standard state, the constant pressure specific heat capacity of mixed smoke, the inlet temperature of the smoke turbine, the inlet pressure of the smoke turbine, the outlet pressure of the smoke turbine and the adiabatic index of the smoke; when the mass flow of the flue gas in a standard state is calculated, the opening of the double acting slide valve is used as an input variable, a flue gas turbine shaft power calculation model is built under the condition that a main motor is in an electric state, the flue gas turbine shaft power is calculated through the main fan shaft power, the gearbox power consumption data, the coupling power consumption data and the main motor output power, the total efficiency of the flue gas turbine is calculated through 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 through the ratio of the flue gas turbine shaft power to the main fan shaft power, and the comprehensive state of the flue gas turbine unit is monitored in real time through the total efficiency of the flue gas turbine, the flue gas energy recovery rate and the adiabatic efficiency of the flue gas turbine.

Inventors

YANG ZHE
CHEN WENWU
PAN LONG
QIU FENG
CHAI YONGXIN

Assignees

中国石油化工股份有限公司
中石化安全工程研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20221104

Claims (11)

1. The method for monitoring the comprehensive state of the smoke machine unit in real time is characterized by comprising the following steps of: A. A theoretical power calculation model of the flue gas turbine is built, and the theoretical power of the flue gas turbine is calculated through the mass flow of the flue gas entering the flue gas turbine in a standard state, the constant-pressure specific heat capacity of mixed flue gas, 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; The theoretical power calculation model of the flue gas turbine specifically comprises the following steps: ; Wherein, the The mass flow of the smoke entering the smoke turbine is kg/s under the standard state; constant pressure specific heat capacity, kJ/(kg.k) of the mixed flue gas; The inlet temperature k of the flue gas turbine; is the inlet pressure of the flue gas turbine, MPa (a); is the outlet pressure of the flue gas turbine, MPa (a); Is the smoke heat insulation index; the mass flow of the flue gas entering the flue gas turbine under the standard state The acquisition is calculated by the following way: ; ; Wherein, the The density of the smoke in the standard state is kg/Nm 3 ; Nm 3 /min, which is the volume flow of the flue gas entering the flue gas turbine in the standard state; The volume flow is Nm 3 /min under the standard state of the main fan; -double acting spool valve a opening,%; opening of double acting slide valve B,%; B. Under the condition that the main motor is in an electric state, a smoke turbine shaft power calculation model is constructed, and the smoke turbine shaft power is calculated through the main fan shaft power, the gearbox power consumption data, the coupling power consumption data and the main motor output power; C. The method comprises the steps of calculating the total efficiency of the smoke turbine according to the ratio of the shaft power of the smoke turbine to the theoretical power of the smoke turbine, calculating the recovery rate of smoke energy according to the ratio of the shaft power of the smoke turbine to the shaft power of a main fan, and monitoring the comprehensive state of a smoke machine set in real time according to the total efficiency of the smoke turbine, the recovery rate of smoke energy and the adiabatic efficiency of the smoke turbine.
2. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 1, wherein the constant-pressure specific heat capacity of the mixed smoke is obtained The acquisition is calculated by the following way: ; Wherein, the KJ/(kg.k) is the average value of the specific heat capacity at constant pressure of the i-th component; The mass content of the i-th component is (m)%.
3. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 1, wherein the smoke turbine shaft power calculation model is specifically: ; Wherein, the The power of the main fan shaft is kw; Is the power consumption of the gear box, kw; The power consumption of the coupler is kw; And the output power of the main motor is kw.
4. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 3, wherein the main fan shaft power The acquisition is calculated by the following way: ; Wherein, the The inlet pressure of the main fan is MPa (a); the outlet pressure of the main fan is MPa (a); Correcting the volume flow for the inlet of the main fan, wherein m 3 /min; is the polytropic index of the main fan; the variable efficiency of the main fan is achieved; Is the mechanical efficiency of the main fan.
5. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 4, wherein the inlet of the main fan corrects the volume flow rate The method comprises the following steps: ; Wherein, the The volume flow is Nm 3 /min under the standard state of the main fan; is the inlet temperature of the main fan, k.
6. The method for monitoring the comprehensive state of a smoke machine set according to claim 4, wherein the main fan has a polytropic efficiency The method comprises the following steps: ; Wherein, the The inlet pressure of the main fan is MPa (a); the outlet pressure of the main fan is MPa (a); the outlet temperature of the main fan is k; The inlet temperature of the main fan is k; the value of the air insulation index is 1.4.
7. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 3, wherein the output power of the main motor The method comprises the following steps: ; Wherein, the Inputting power, kw, for the main motor; power is lost for the main motor, kw.
8. The method for monitoring the comprehensive state of a smoke machine set in real time according to claim 1, wherein the total efficiency of the smoke turbine in the step C is as follows: ; Wherein, the The power of the shaft of the flue gas turbine is; Theoretical power of the flue gas turbine; the adiabatic efficiency of the flue gas turbine in the step C is as follows: ; Wherein, the T 2 is the inlet temperature of the flue gas turbine, k, and the outlet temperature of the flue gas turbine, k; is the inlet pressure of the flue gas turbine, MPa (a); is the outlet pressure of the flue gas turbine, MPa (a); Is the smoke heat insulation index; and C, the flue gas energy recovery rate in the step is as follows: ; Wherein, the The shaft power of the smoke turbine is kw; is the main fan shaft power, kw.
9. A real-time monitoring system for the comprehensive state of a smoke machine unit, characterized in that the method as claimed in any one of claims 1 to 8 is adopted, comprising: The system comprises a flue gas turbine theoretical power calculation module, a double-acting slide valve opening degree and a flue gas adiabatic index calculation module, wherein the flue gas turbine theoretical power calculation module is used for constructing a flue gas turbine theoretical power calculation model, and calculating the flue gas turbine theoretical power through mass flow of flue gas entering a flue gas turbine in a 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; The smoke turbine shaft power calculation module is used for constructing a smoke turbine shaft power calculation model under the condition that the main motor is in an electric state, and calculating the smoke turbine shaft power through the main fan shaft power, the gearbox power consumption data, the coupling power consumption data and the main motor output power; The comprehensive state evaluation module is used for calculating the total efficiency of the smoke turbine through the ratio of the shaft power of the smoke turbine to the theoretical power of the smoke turbine, calculating the recovery rate of smoke energy through the ratio of the shaft power of the smoke turbine to the shaft power of the main fan, and monitoring the comprehensive state of the smoke turbine unit in real time through the total efficiency of the smoke turbine, the recovery rate of smoke energy and the adiabatic efficiency of the smoke turbine.
10. An electronic device, comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method for monitoring the integrated state of a smoke machine set according to any one of claims 1 to 8 in real time.
11. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions for causing the computer to perform the method for monitoring the comprehensive state of a smoke machine set according to any one of claims 1 to 8 in real time.

Description

Method and system for monitoring comprehensive state of smoke machine unit in real time, electronic equipment and storage medium Technical Field The invention relates to the technical field of energy efficiency monitoring of petrochemical large units, in particular to a method, a system, electronic equipment and a storage medium for monitoring the comprehensive state of a smoke machine unit in real time. Background For a long time, the process energy-saving optimization of the production device has been paid attention to, but the energy saving of equipment is not paid attention to. In practice, the energy consumption of the equipment is relatively high in the energy consumption structure of the device, and taking the catalytic cracking device with the highest energy consumption in the oil refining process as an example, the energy consumption of a large-sized unit and a pump thereof is about 11% of the total energy consumption of the catalytic device. Therefore, it is necessary to perform energy-saving work on the equipment. The smoke turbine-main fan-motor/generator smoke machine unit is used as main energy recovery equipment of the catalytic cracking device and is core equipment of the catalytic cracking device. After the catalytic cracking flue gas is separated and purified, the catalytic cracking flue gas enters a flue gas turbine through a high-temperature flue gas butterfly valve to expand and do work, and the energy generated by the catalytic cracking flue gas is recovered by the flue gas turbine. The flue gas butterfly valve and the double acting slide valve arranged in the flue gas channel are main devices for adjusting the pressure of the regenerator or controlling the differential pressure of the reactor and the regenerator and the rotating speed of the flue gas turbine. The main fan generally adopts an axial flow fan with adjustable stationary blades, and the air quantity of the fan is automatically adjusted by controlling the adjustable stationary blades, so that the production requirement is effectively met. The energy in the flue gas is recovered through the flue gas turbine, the heat energy and the pressure energy of the flue gas are converted into kinetic energy, and then the energy is directly transmitted to the fan through the rotating shaft to do work. When the energy recovered by the flue gas turbine is smaller than the energy consumed by the fan, the motor is in an electric state, and otherwise, the motor is in a power generation state. The energy efficiency of the smoke machine unit directly influences the energy consumption of the device. The smoke machine set has complex structure and principle, numerous operation parameters and stronger mutual coupling effect between the parameters. At present, the smoke machine unit lacks accurate online real-time energy efficiency monitoring technology, so that the transverse comparison of the same unit energy efficiency of different devices cannot be performed in time, the historical change trend of the energy consumption of the unit per se is inconvenient to know, the unit energy efficiency management lacks targeting, sense of urgency and direction guidance optimization, and the improvement of the unit energy efficiency is restricted. In the smoke machine set, the operation economy evaluation of the smoke turbine and the main fan is particularly important, and when the shaft power of the smoke turbine is calculated, the related parameters of the main motor are also required to be considered, so that when the comprehensive state of the smoke machine set is evaluated, the parameter indexes of the smoke machine set are required to be comprehensively considered. In the prior art, although there is also a monitoring technology related to the energy efficiency of a smoke machine set, for example, "analysis of smoke machine efficiency of catalytic cracker" published in "Shandong chemical industry" (2014.07 period), a calculation method of smoke machine efficiency of a smoke machine set of catalytic cracker (main fan+smoke machine+motor/generator) is proposed, and calculation and analysis of smoke machine of catalytic cracker of 3.0x 6 t/a of a certain refinery are performed. However, the method is not comprehensive in consideration of the technical parameters obtained on line, the smoke composition and other operation parameters, so that the real-time and accurate evaluation results of the operation energy efficiency and the economy of the smoke machine unit are difficult to obtain, and in addition, the method also does not comprehensively evaluate the comprehensive state of the unit in aspects of smoke energy recovery rate, smoke machine heat insulation efficiency and the like. Therefore, there is a need for a method and a system for monitoring the comprehensive state of a smoke machine unit in real time, which can realize the real-time and accurate evaluation result of the operation energy efficiency and economy of the smoke machine unit by acquirin