An energy consumption evaluation system and method for a full-condensing steam turbine of a drag air separation compressor unit

Abstract

The application discloses a kind of for dragging full condensing steam turbine energy consumption evaluation system of air separation compressor unit method, the energy consumption evaluation system includes data acquisition module, data processing module, data output module, the data acquisition module is needed from distributed control system server Real-time data is sent to data processing module, and the distributed control system server is configured for air separation project site data processing system.The data processing module uses self-designed energy consumption evaluation method, judges, selects and calculates the data collected when stable operation, and the energy consumption evaluation method includes compressor unit power calculation unit, steam turbine power calculation unit, steam energy consumption conversion unit, energy consumption evaluation unit.The data output module sends the result calculated to energy consumption evaluation system main display screen.The data collected by the application is stable, reliable and high in accuracy, the calculation method is accurate, realizes real-time accurate evaluation to unit energy consumption and clear direction for energy-saving optimization.

Description

Technical Field

[0001] This invention relates to the field of automated detection technology in the air separation industry, and in particular to an energy consumption assessment system and method for a fully condensing steam turbine used to drive an air separation compressor unit. Background Technology

[0002] The air separation industry provides the petroleum and chemical industries with large quantities of cryogenically separated oxygen, nitrogen, and other products. With China's rapid economic development, major industries such as large-scale smelting, petrochemicals, and thermal power have begun large-scale development, making my country the world's most active country in air separation technology development and the country with the most air separation equipment projects. As air separation facilities become larger-scale, condensing steam turbines used to drive air separation compressor units have been widely applied, but this also consumes a significant amount of energy. With the national goal of "carbon neutrality and carbon peaking," higher demands have been placed on the energy consumption of air separation, leading to its development towards higher reliability, larger scale, and lower energy consumption.

[0003] Patent 202010745665.0, "A Method for Testing the No-Load Energy Consumption of a Steam Turbine Generator Set," provides a method for testing the no-load energy consumption of a steam turbine in a thermal power plant. However, it does not address the field of air separation and does not provide an energy consumption assessment method for the stable operation of a fully condensing steam turbine used to drive an air separation compressor unit. Patent 200810055357.4, "Software Platform for Quantitative Analysis of Energy Consumption of Steam Turbine Unit Thermal System," provides software for quantitative analysis of the thermal system of a thermal power unit, capable of locally and quantitatively analyzing the thermal parameters of the steam turbine unit. However, it does not address the energy consumption analysis of fully condensing steam turbine units used to drive air separation compressor units in the field of air separation. Because fully condensing steam turbines used to drive air separation compressor units are complex, mainly including an oil circulation system, process gas system, steam system, condensation system, and control system, data acquisition requires collecting a large amount of various data types. Currently, there is no simple and accurate energy consumption assessment system or method for fully condensing steam turbines used to drive air separation compressor units.

[0004] In summary, designing an energy consumption assessment system and method for a fully condensing steam turbine used to drive an air separation compressor unit, and performing real-time, multi-dimensional, comprehensive data acquisition and processing of the operating equipment, as well as energy consumption assessment, is of great practical significance. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an energy consumption assessment system and method for a fully condensing steam turbine used to drive an air separation compressor unit. This system and method perform comprehensive data acquisition on the fully condensing steam turbine driving the air separation compressor unit, resulting in higher data accuracy and more convincing detection results. At the same time, the data processing module performs energy consumption assessment on the fully condensing steam turbine used to drive the air separation compressor unit, clarifies the direction of energy consumption optimization, and can display the curve of steam consumption of the corrected steam turbine changing over time in real time, providing a more intuitive display for on-site operators.

[0006] The technical problem solved by this invention is achieved through the following technical solution: an energy consumption assessment system and method for a fully condensing steam turbine used to drive an air separation compressor unit. The system includes a data acquisition module, a data processing module, and a data output module. The method includes the following steps:

[0007] (1) The data acquisition module collects the required real-time data from the distributed control system server and sends it to the data processing module;

[0008] (2) The data processing module processes the data collected from the data acquisition module. The data processing module uses a self-designed energy consumption assessment method to judge, select, and calculate the range of the original data. Through the judgment and selection of the data processing module, data with excessive fluctuations or operating data that obviously does not meet the design requirements can be filtered out, thereby improving the accuracy of the calculation results.

[0009] (3) The compressor power calculation unit, turbine power calculation unit, steam energy consumption conversion unit, and energy consumption assessment unit of the data processing module calculate the compressor power, turbine power, and converted steam consumption under the current operating conditions, and assess the actual steam energy consumption of the unit. After the data processing module completes its work, it transmits the data processing results to the data output module.

[0010] (4) The data output module receives the results from the data processing module, completes the classification and storage of the data, and sends the data to the main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit.

[0011] (5) The main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit presents real-time data and unit operating energy consumption status in the form of tables and curves.

[0012] Preferably, in step (1), the data acquisition module collects the required real-time data from the distributed control system server, including compressor inlet temperature T1, compressor outlet temperature T2, compressor inlet pressure P1, compressor outlet pressure P2, compressor inlet humidity H1, compressor inlet flow rate V1, turbine inlet steam flow rate V2, turbine inlet steam temperature T3, turbine inlet steam pressure P3, turbine speed n, and turbine exhaust pressure P4.

[0013] Preferably, the specific steps for judging, selecting, and calculating the range of the original data in step (2) are as follows:

[0014] ① Set the high and low range limits for each data signal in the real-time data processing module;

[0015] ② Compare each data signal from the real-time data acquisition module with the high and low limit ranges. If it is within the range, the data is considered reasonable and usable; if it is outside the range, the data is considered unreasonable. Unreasonable data is not included in subsequent calculations.

[0016] ③ Take the average value of each data point over a set time interval.

[0017] Preferably, the calculation steps in step (3) are as follows:

[0018] ①The compressor unit power calculation unit is used to calculate the compressor unit power under the current operating conditions:

[0019]

[0020] N i Compressor unit power, kW;

[0021] q m : Inlet air mass flow rate of compressor unit, kg / s;

[0022] R: Gas constant of air, 287 J / (kg·K);

[0023] T1: Compressor unit inlet temperature, K;

[0024] P1: Compressor unit inlet pressure, MPa a (A);

[0025] P2: Compressor unit outlet pressure, MPa a (A);

[0026] η t Isothermal efficiency of the compressor unit;

[0027] c t1 : Compressor unit inlet ambient temperature correction factor;

[0028] c h1 :Compressor unit inlet humidity correction factor.

[0029] ②The turbine power calculation unit is used to calculate the turbine power under the current operating conditions:

[0030] H1 = f(P3, T3)

[0031] H2 = f(P4, T4)

[0032] Q = (H1 - H2) × V2

[0033] H1: Enthalpy of steam at the turbine inlet, kJ / kg;

[0034] H2: Enthalpy of steam at the turbine exhaust port, kJ / kg;

[0035] V2: Steam flow rate at the turbine inlet, kg / s; Q: Internal power of the turbine, kW.

[0036] ③ The steam energy consumption conversion unit is used to calculate the corrected steam consumption of the steam turbine:

[0037] V corr =V2×(1+c p3 +c t3 +c p4 +c n )

[0038] V corr Corrected steam consumption of the steam turbine, t / h;

[0039] V2: Measured steam flow rate at the turbine inlet, t / h;

[0040] c p3 The influence coefficient of the difference between the measured steam pressure at the turbine inlet and the design steam pressure at the turbine inlet;

[0041] c t3 The influence coefficient of the difference between the measured temperature of the steam at the turbine inlet and the design temperature of the steam at the turbine inlet;

[0042] c p4 The influence coefficient of the difference between the measured steam pressure at the turbine outlet and the design steam pressure at the turbine outlet;

[0043] c n The influence coefficient of the difference between the measured speed of the steam turbine and the design speed of the steam turbine.

[0044] ④ The energy consumption assessment unit is used to calculate the current actual steam energy consumption of the unit:

[0045] ΔV=(V d-V corr )

[0046] ΔV: Energy saved by the steam turbine, t / h. If it is negative, its absolute value is the energy consumption exceeding the standard.

[0047] V d Steam consumption of the turbine under design operating conditions, t / h;

[0048] In cases where steam energy consumption exceeds the limit, the turbine internal power Q and compressor unit power N are compared. i Based on their respective design values, we can clarify the direction for subsequent energy consumption optimization.

[0049] As a preferred option, step (4) of completing the classification and storage of data refers to saving the compressor unit-related parameters and the steam turbine-related parameters to different storage files respectively.

[0050] Preferably, the table in step (5) specifically includes the following contents: compressor inlet temperature T1, compressor outlet temperature T2, compressor inlet pressure P1, compressor outlet pressure P2, compressor inlet humidity H1, compressor inlet flow rate V1, turbine inlet steam flow rate V2, turbine inlet steam temperature T3, turbine inlet steam pressure T3, turbine speed n, turbine exhaust pressure P4, and compressor shaft power N. i The parameters are calculated as follows: turbine internal power Q and turbine energy saving ΔV. The above process is repeated to calculate the values ​​of these parameters at different time points. Specifically, the curves include: a curve showing the change in steam consumption over time for the corrected condensing turbine used to drive the air separation compressor unit.

[0051] The advantages and positive effects of this invention are as follows:

[0052] This invention leverages the stable operation of condensing steam turbines used to drive air separation compressor units. It employs a self-designed energy consumption assessment system and method to process collected data, resulting in more accurate energy consumption assessments and providing direction for energy optimization. The data output module also enables a more intuitive presentation of the processed data, helping operators understand the energy consumption level of the unit and providing a reference for the economical operation of condensing steam turbines used to drive air separation compressor units. Attached Figure Description

[0053] Figure 1 This is a structural block diagram of an energy consumption assessment system for a fully condensing steam turbine used to drive an air separation compressor unit, according to the present invention.

[0054] Figure 2 This is a flowchart of a method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit, according to the present invention. Detailed Implementation

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0056] Example 1

[0057] An energy consumption assessment system for a fully condensing steam turbine used to drive an air separation compressor unit, such as Figure 1 As shown, the hardware system of this system includes:

[0058] (1) Data Acquisition Module: The data acquisition module collects the required real-time data from the distributed control system server and sends it to the data processing module. The distributed control system server is a data processing system configured on-site for the air separation project. The data acquisition module can collect and evaluate real-time data related to the system from a massive amount of data from the distributed control system server. In actual processing, all types of required data can be transmitted to the background database, and then the background database can input them into different data processing modules. At the same time, new data can be viewed at any time through the background database. This transmission is secure, efficient, and not prone to congestion.

[0059] (2) Data processing module: The data processing module processes the data acquired from the data acquisition module. The data processing module employs a self-designed energy consumption assessment method to judge, select, and calculate the range of the original data. Through the judgment and selection by the data processing module, data with excessive fluctuations or operating data that clearly does not meet design requirements can be filtered out, improving the accuracy of the calculation results.

[0060] (3) The compressor power calculation unit, turbine power calculation unit, steam energy consumption conversion unit, and energy consumption assessment unit of the data processing module calculate the compressor power, turbine power, and converted steam consumption under the current operating conditions, and assess the actual steam energy consumption of the unit. After the data processing module completes its work, it transmits the data processing results to the data output module.

[0061] (4) Data output module, which receives the results from the data processing module, completes the classification and storage of the data, and sends the data to the main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit.

[0062] (5) The main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit presents real-time data and unit operating energy consumption status in the form of tables and curves.

[0063] The data processing module and the data output module are specifically portable computers, such as laptops, PDAs, and tablets, which are easy to carry.

[0064] Example 2

[0065] Energy consumption assessment methods for fully condensing steam turbines used to drive air separation compressor units, such as Figure 2 As shown, the hardware system of this method includes: an energy consumption data acquisition module, a data processing module, a data output module, an energy consumption assessment system main display screen, and a data storage server for driving the fully condensing steam turbine of the air separation compressor unit. The specific steps of this method are as follows:

[0066] (1) The data acquisition module collects the required real-time data from the distributed control system server and sends it to the data processing module. The distributed control system server is the data processing system configured on-site for the air separation project.

[0067] The data acquisition module collects the required real-time data from the distributed control system server, including compressor inlet temperature T1, compressor outlet temperature T2, compressor inlet pressure P1, compressor outlet pressure P2, compressor inlet humidity H1, compressor inlet flow rate V1, turbine inlet steam flow rate V2, turbine inlet steam temperature T3, turbine inlet steam pressure P3, turbine speed n, and turbine exhaust pressure P4.

[0068] (2) The data processing module processes the data collected from the data acquisition module. The data processing module uses a self-designed energy consumption assessment method to judge, select, and calculate the range of the original data. Through the judgment and selection of the data processing module, data with excessive fluctuations or operating data that obviously does not meet the design requirements can be filtered out, thereby improving the accuracy of the calculation results.

[0069] The specific steps for determining, selecting, and calculating the range of the original data are as follows:

[0070] ① Set the high and low range limits for each data signal in the real-time data processing module;

[0071] ② Compare each data signal from the real-time data acquisition module with the high and low limit ranges. If it is within the range, the data is considered reasonable and usable; if it is outside the range, the data is considered unreasonable. Unreasonable data is not included in subsequent calculations.

[0072] ③ Take the average value of each data point over a set time interval.

[0073] (3) The compressor power calculation unit, turbine power calculation unit, steam energy consumption conversion unit, and energy consumption assessment unit of the data processing module calculate the compressor power, turbine power, and converted steam consumption under the current operating conditions, and assess the actual steam energy consumption of the unit. After the data processing module completes its work, it transmits the data processing results to the data output module.

[0074] The data processing module employs a self-designed processing and analysis method, with the following specific steps:

[0075] ①The compressor unit power calculation unit is used to calculate the compressor unit power under the current operating conditions:

[0076]

[0077] N i Compressor unit power, kW;

[0078] q m : Inlet air mass flow rate of compressor unit, kg / s;

[0079] R: Gas constant of air, 287 J / (kg·K);

[0080] T1: Compressor unit inlet temperature, K;

[0081] P1: Compressor unit inlet pressure, MPa a (A);

[0082] P2: Compressor unit outlet pressure, MPa a (A);

[0083] η t Isothermal efficiency of the compressor unit;

[0084] c t1 : Compressor unit inlet ambient temperature correction factor;

[0085] c h1 :Compressor unit inlet humidity correction factor.

[0086] ②The turbine power calculation unit is used to calculate the turbine power under the current operating conditions:

[0087] H1 = f(P3, T3)

[0088] H2 = f(P4, T4)

[0089] Q = (H1 - H2) × V2

[0090] H1: Enthalpy of steam at the turbine inlet, kJ / kg;

[0091] H2: Enthalpy of steam at the turbine exhaust port, kJ / kg;

[0092] V2: Steam flow rate at the turbine inlet, kg / s;

[0093] Q: Internal power of steam turbine, kW.

[0094] ③ The steam energy consumption conversion unit is used to calculate the corrected steam consumption of the steam turbine:

[0095] V corr =V2×(1+c p3 +c t3 +c p4 +c n )

[0096] V corr Corrected steam consumption of the steam turbine, t / h;

[0097] V2: Measured steam flow rate at the turbine inlet, t / h;

[0098] c p3 The influence coefficient of the difference between the measured steam pressure at the turbine inlet and the design steam pressure at the turbine inlet;

[0099] c p3 The influence coefficient of the difference between the measured temperature of the steam at the turbine inlet and the design temperature of the steam at the turbine inlet;

[0100] c p4 The influence coefficient of the difference between the measured steam pressure at the turbine outlet and the design steam pressure at the turbine outlet;

[0101] c n The influence coefficient of the difference between the measured speed of the steam turbine and the design speed of the steam turbine.

[0102] ④ The energy consumption assessment unit is used to calculate the current actual steam energy consumption of the unit:

[0103] ΔV=(V d -V corr )

[0104] ΔV: Energy saved by the steam turbine, t / h. If it is negative, its absolute value is the energy consumption exceeding the standard.

[0105] V d Steam consumption of the turbine under design operating conditions, t / h;

[0106] In cases where steam energy consumption exceeds the limit, the turbine internal power Q and compressor unit power N are compared. i Based on their respective design values, we can clarify the direction for subsequent energy consumption optimization.

[0107] (4) The data output module receives the results from the data processing module, completes the classification and storage of the data, and sends the data to the main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit.

[0108] Among them, completing the classification and storage of data refers to saving the relevant parameters of the compressor unit and the relevant parameters of the steam turbine to different storage files.

[0109] (5) The main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit presents real-time data and unit operating energy consumption status in the form of tables and curves.

[0110] The table specifically includes the following information: compressor inlet temperature T1, compressor outlet temperature T2, compressor inlet pressure P1, compressor outlet pressure P2, compressor inlet humidity H1, compressor inlet flow rate V1, turbine inlet steam flow rate V2, turbine inlet steam temperature T3, turbine inlet steam pressure T3, turbine speed n, turbine exhaust pressure P4, and compressor shaft power N. i The parameters are calculated as follows: turbine internal power Q and turbine energy saving ΔV. The above process is repeated to calculate the values ​​of these parameters at different time points. Specifically, the curves include: a curve showing the change in steam consumption of the corrected condensing turbine used to drive the air separation compressor unit over time.

Claims

1. A method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit, characterized in that: The system includes a data acquisition module, a data processing module, and a data output module. The method includes the following steps: (1) The data acquisition module collects the required real-time data from the distributed control system server and sends it to the data processing module; the real-time data collected by the data acquisition module from the distributed control system server in step (1) includes the compressor unit inlet temperature and the compressor unit outlet temperature. compressor unit inlet pressure compressor unit outlet pressure Inlet humidity of compressor unit compressor unit inlet flow Steam flow rate at the turbine inlet Steam inlet temperature of steam turbine Steam pressure at the turbine inlet Steam turbine speed Steam turbine exhaust pressure ; (2) The data processing module processes the data collected from the data acquisition module. The data processing module adopts a custom energy consumption assessment method to judge, select and calculate the range of the original data. Through the judgment and selection of the data processing module, data with excessive fluctuations or running data that are obviously inconsistent with the design requirements are filtered out, thereby improving the accuracy of the calculation results. (3) The compressor power calculation unit, turbine power calculation unit, steam energy consumption conversion unit, and energy consumption assessment unit of the data processing module calculate the compressor power, turbine power, and converted steam consumption under the current operating conditions, and assess the actual steam energy consumption of the unit. After the data processing module completes the data processing, it transmits the data processing results to the data output module; ① The compressor power calculation unit is used to calculate the compressor power under the current operating conditions: Compressor unit power, ; : Inlet air mass flow rate of the compressor unit ; : Gas constant of air, 287 ; : Compressor unit inlet temperature, ; : Compressor unit inlet pressure, ; : Compressor unit outlet pressure, ; Isothermal efficiency of the compressor unit; : Compressor unit inlet ambient temperature correction factor; :Compressor unit inlet humidity correction factor; ②The turbine power calculation unit is used to calculate the turbine power under the current operating conditions: Enthalpy of steam at the turbine inlet ; Enthalpy of steam at the turbine exhaust port ; Steam flow rate at the turbine inlet ; Steam turbine internal power, ; (4) The data output module receives the results from the data processing module, completes the classification and storage of the data, and sends the data to the main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit; (5) The main display screen of the energy consumption assessment system for the fully condensing steam turbine used to drive the air separation compressor unit simultaneously presents real-time data and unit operating energy consumption status in the form of tables and curves; the table in step (5) specifically includes the following contents: compressor unit inlet temperature compressor unit outlet temperature compressor unit inlet pressure compressor unit outlet pressure Inlet humidity of compressor unit Compressor unit inlet flow rate, turbine inlet steam flow rate Steam inlet temperature of steam turbine Steam pressure at the turbine inlet Steam turbine speed Steam turbine exhaust pressure Compressor unit shaft power Steam turbine internal power, steam turbine energy savings Repeat the above process to calculate the values ​​of the above parameters at different time points.

2. The method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit according to claim 1, characterized in that: The specific steps for judging, selecting, and calculating the range of the original data in step (2) are as follows: ① Set the high and low range limits for each data signal in the real-time data processing module; ② Compare each data signal from the real-time data acquisition module with the high and low limit ranges. If it is within the range, the data is judged to be reasonable and usable. If it is not within the range, the data is judged to be unreasonable. Unreasonable data is not included in subsequent calculations. ③ Take the average value of each data point over a set time interval.

3. The method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit according to claim 1, characterized in that: The calculation steps for step (3) are as follows: ③ The steam energy consumption conversion unit is used to calculate the corrected steam consumption of the steam turbine: Corrected steam consumption of the steam turbine. ; Steam flow rate at the turbine inlet ; The influence coefficient of the difference between the measured steam pressure at the turbine inlet and the design steam pressure at the turbine inlet; The influence coefficient of the difference between the measured temperature of the steam at the turbine inlet and the design temperature of the steam at the turbine inlet; The influence coefficient of the difference between the measured steam pressure at the turbine outlet and the design steam pressure at the turbine outlet; The influence coefficient of the difference between the measured speed and the design speed of the steam turbine; ④ The energy consumption assessment unit is used to calculate the current actual steam energy consumption of the unit: Energy savings from steam turbines If the value is negative, its absolute value is the energy consumption exceeding the standard. Steam consumption under design operating conditions for steam turbines. ; In cases where steam energy consumption exceeds the limit, the internal power of the steam turbine can be compared. Compressor unit power Based on their respective design values, we can clarify the direction for subsequent energy consumption optimization.

4. The method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit according to claim 1, characterized in that: The step (4) of completing the classification and storage of data refers to saving the compressor unit-related parameters and steam turbine-related parameters to different storage files respectively.

5. The method for evaluating the energy consumption of a fully condensing steam turbine used to drive an air separation compressor unit according to claim 1, characterized in that: The curves specifically include: the curve showing the change in steam consumption of the fully condensing steam turbine used to drive the air separation compressor unit over time.

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