A mixed gas calorific value monitoring system and method

Abstract

The present invention relates to a mixed gas calorific value monitoring system and method, and belongs to the technical field of steel energy production management. The system includes a gas mixing station parameter monitoring module, a mixed gas user monitoring module, a monitoring information transmission module, a gas pipeline network flow analysis module, and a mixed gas calorific value monitoring terminal; the gas mixing station parameter monitoring module and the mixed gas user monitoring module are connected to the gas pipeline network flow analysis module and the mixed gas calorific value monitoring terminal through the monitoring information transmission module; the gas pipeline network flow analysis module analyzes and calculates the received monitoring data, integrates the real-time monitoring data and the simulation calculation results, and displays them visually on the mixed gas calorific value monitoring terminal. The present invention can calculate the calorific value of each mixed gas user in real time, and realize the calorific value monitoring of the entire mixed gas system.

Description

Technical Field

[0001] The invention belongs to the technical field of steel energy production management and relates to a mixed coal gas calorific value monitoring system and method. Background Art

[0002] Gas is the most important secondary energy source in the production process of steel enterprises, accounting for more than 40% of the total energy consumption of the plant. In the production process of blast furnaces, converters and coke ovens, by-product gas is produced, which is called blast furnace gas, converter gas and coke oven gas respectively. Due to the differences in the components of various gases, the calorific value of each gas will also vary greatly. In actual use, in order to meet the requirements of different production users for the calorific value of gas, steel plants build gas mixing stations to achieve the mixing of two or more gases in a certain proportion, and distribute them to the corresponding mixed gas users through the mixed gas pipeline network.

[0003] In the actual production process, the calorific value of blast furnace gas, converter gas and coke oven gas will change due to fluctuations in the production process. Although the control system of the gas mixing station is constantly adjusted with the calorific value and pressure stability of the mixed gas as the control target, changes in upstream conditions will also cause fluctuations in the calorific value of the gas at the outlet of the gas mixing station. The mixed gas then enters the pipeline network for distribution. Since gas users are distributed throughout the factory, the gas pipeline network structure is complex, and many companies also have ring networks. At the same time, the usage of each user is constantly changing, resulting in secondary or multiple mixing of gas in the pipeline network. Therefore, the actual gas calorific value of each user point is not synchronized with the gas calorific value of the gas at the outlet of the gas mixing station.

[0004] Since users of mixed gas are more sensitive to changes in calorific value, for example, steel rolling heating furnaces need to adjust the combustion control strategy in real time according to the calorific value of the gas to obtain a more efficient combustion effect. It is not reliable to use the calorific value of the gas at the outlet of the mixing station as a reference. The investment in installing a gas calorific value analyzer for all mixed gas users is relatively large. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a mixed gas calorific value monitoring system and method, which detects only the gas components at the outlet of the mixing station, uses the hydraulic flow characteristics of the gas pipeline network to perform online simulation calculations of the pipeline network flow, and obtains the calorific value of each mixed gas user in real time, thereby realizing calorific value monitoring of the entire mixed gas system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] 1. A mixed gas calorific value monitoring system, comprising a gas mixing station parameter monitoring module, a mixed gas user monitoring module, a monitoring information transmission module, a gas pipe network flow analysis module and a mixed gas calorific value monitoring terminal;

[0008] The gas mixing station parameter monitoring module and the mixed gas user monitoring module are connected to the gas network flow analysis module and the mixed gas calorific value monitoring terminal through the monitoring information transmission module;

[0009] The monitoring information transmission module is used to collect monitoring values ​​at the gas mixing station and each mixed gas user equipment, and transmit them to the gas pipe network flow analysis module and the mixed gas calorific value monitoring terminal for analysis, calculation and visual display respectively;

[0010] The gas network flow analysis module analyzes and calculates the received monitoring data, integrates the real-time monitoring data and the simulation calculation results, and displays them visually on the mixed gas calorific value monitoring terminal.

[0011] Furthermore, the gas mixing station parameter monitoring module uses a flow meter, a pressure gauge, a thermometer and a gas composition analyzer to monitor the gas flow, pressure, temperature and gas components of the mixing station outlet in real time, wherein the gas components include CO, CO2, H2, CH4, C m H n , O2, N2; the flow meter, pressure gauge, thermometer and gas composition analyzer used are installed on the main line at the outlet of the gas mixing station. All detection instruments collect various detection data through the network through the network interface by the monitoring information transmission module.

[0012] Furthermore, the mixed gas user monitoring module uses flow meters, pressure gauges, and thermometers to monitor the flow, pressure, and temperature of each mixed gas user device in real time; the flow meters, pressure gauges, and thermometers used are installed on the pipelines at the entrance of each mixed gas user device, and all detection instruments are used through the network interface by the monitoring information transmission module to collect various detection data through the network.

[0013] Furthermore, the gas network flow analysis module establishes a hydraulic simulation calculation model of the mixed gas network according to the configuration conditions of the mixed gas network; the real-time calorific value of each mixed gas user is calculated based on the real-time monitoring data of the gas flow, pressure, temperature, gas components at the mixing station outlet and the flow, pressure and temperature of each mixed gas user equipment provided by the monitoring information transmission module, and the calculation result is transmitted to the mixed gas calorific value monitoring terminal.

[0014] Furthermore, the simulation calculation model is established based on the pipeline hydraulic calculation theory equations, including the mass, momentum and energy conservation equations of pipeline flow, and the connection relationship equations between valves and various gas equipment; the mixed gas pipeline network configuration conditions include the length, outer diameter, wall thickness, absolute roughness of each section of the gas pipeline in the mixed gas pipeline network, as well as the caliber, opening and flow characteristic parameters of each valve, the size and set operating parameters of each gas user equipment, and the connection relationship parameters between pipelines, valves, gas mixing stations and gas user equipment.

[0015] Furthermore, the mixed gas calorific value monitoring terminal constructs a visual interface through a computer software system to display real-time monitoring information of the mixed gas calorific value, including real-time monitoring data of the gas flow, pressure, temperature, and gas components at the outlet of the mixing station, as well as real-time monitoring data of the flow, pressure, and temperature of each mixed gas user's equipment and instantaneous simulation calculation results of the gas calorific value of each mixed gas user obtained by simulation calculation.

[0016] 2. A method for monitoring the calorific value of mixed gas, comprising the following steps:

[0017] S1: Collecting monitoring data of the mixed gas system, the monitoring information transmission module transmits the monitoring data to the gas network flow analysis module and the mixed gas calorific value monitoring terminal;

[0018] S2: The gas network flow analysis module performs mixed gas network simulation calculation based on the collected mixed gas system monitoring data to obtain the calculation data of the calorific value of each mixed gas user;

[0019] S3: Visually display the monitoring data of the mixed gas system and the calculated data of the calorific value of each mixed gas user through the mixed gas calorific value monitoring terminal.

[0020] Further, in step S2, the gas network flow analysis module performs mixed gas network simulation calculation, specifically including:

[0021] S21: establishing a hydraulic simulation calculation model of the mixed gas pipeline network according to the configuration conditions of the mixed gas pipeline network;

[0022] S22: discretely solving the model equation according to the numerical calculation method to obtain the gas component content at each mixed gas user device, and combining the calorific value of each component in the gas to calculate the real-time calorific value of the gas at each mixed gas user.

[0023] Further, in step S22, the model equation is discretely solved by a numerical calculation method, specifically including: using a finite volume method to discretize the pressure-velocity coupling equation to form a discrete equation group, and iteratively solving the equation through a pressure prediction-correction method.

[0024] Furthermore, in step S22, during the solution process, the simulation calculation module needs to read the calculation boundary condition data required by the pipe network hydraulic simulation calculation model, including the gas flow, pressure, temperature and gas data at the outlet of the mixing station, including CO, CO2, H2, CH4, C m H n , O2 and N2 content, as well as real-time detection data of flow, pressure and temperature at each mixed gas user equipment;

[0025] Calculate the real-time calorific value of gas at each mixed gas user:

[0026]

[0027] Among them, CO, H2, CH4 and C m H n are the corresponding gas composition data (%) at each mixed gas user; H CO , They are CO, H2, CH4 and C m H n Calorific value (kJ / Nm 3 ).

[0028] The beneficial effects of the present invention are as follows: the present invention can realize soft metering of the calorific value of gas in the mixed gas system, and realize real-time monitoring of the calorific value of each mixed gas user in the mixed gas pipeline network with relatively low investment, thereby providing an important reference for regulating the gas use of each user, and being beneficial to improving the energy efficiency of mixed gas users.

[0029] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 A structural diagram of a mixed gas calorific value monitoring system provided by the present invention;

[0032] Figure 2 A diagram showing the arrangement of mixed gas pipe network parameter detection provided by the present invention;

[0033] Reference numerals: Q-flow meter, P-pressure gauge, T-thermometer, C-gas composition analyzer. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] See also Figure 1-2 ,like Figure 1 As shown, the present invention preferably provides a mixed gas calorific value monitoring system, including: a gas mixing station parameter monitoring module, a mixed gas user monitoring module, a monitoring information transmission module, a gas pipe network flow analysis module, and a mixed gas calorific value monitoring terminal. The gas mixing station parameter monitoring module and the mixed gas user monitoring module are connected to the gas pipe network flow analysis module and the mixed gas calorific value monitoring terminal through the information transmission module. The gas pipe network flow analysis module analyzes and calculates the data received from the information acquisition module, integrates the real-time monitoring data and the simulation calculation results, and displays them visually on the mixed gas calorific value monitoring terminal.

[0036] According to this embodiment, the corresponding instruments are installed to detect the parameters of the mixed gas pipeline network. The specific arrangement is as follows: Figure 2 shown.

[0037] In this embodiment, the gas mixing station parameter monitoring module uses a flow meter, a pressure gauge, a thermometer and a gas composition analyzer to monitor the gas flow, pressure, temperature and gas components of the mixing station outlet in real time, where the gas components include CO, CO2, H2, CH4, C m H n , O2, N2; the flow meter, pressure gauge, thermometer and gas composition analyzer used are installed on the main line at the outlet of the gas mixing station. All detection instruments collect various detection data through the network through the network interface by the monitoring information transmission module, and transmit them to the gas network flow analysis module and the mixed gas calorific value monitoring terminal.

[0038] The mixed gas user monitoring module uses flow meters, pressure gauges and thermometers to monitor the flow, pressure and temperature of each mixed gas user in the pipeline network in real time. The flow meters, pressure gauges and thermometers used are installed on the pipelines at the entrance of each mixed gas user. All detection instruments are collected through the network interface by the monitoring information transmission module through the network, and transmitted to the gas pipeline network flow analysis module and the mixed gas calorific value monitoring terminal.

[0039] The gas network flow analysis module establishes a hydraulic simulation model for the mixed gas network according to the configuration conditions of the mixed gas network. The simulation model is established based on the pipeline hydraulic calculation theory equations, including the mass, momentum and energy conservation equations of pipeline flow, and the connection relationship equations of valves and various gas equipment. The configuration conditions of the mixed gas network include the length, outer diameter, wall thickness, absolute roughness of each section of the gas pipeline in the mixed gas network, the caliber, opening, flow characteristic parameters of each valve, the size and set operating parameters of each gas equipment, and the connection relationship parameters between pipelines, valves, gas mixing stations and gas users.

[0040] The monitoring information transmission module provides the gas network flow analysis module with the real-time detection data of the gas flow, pressure, temperature, gas components at the outlet of the mixing station, and the flow, pressure, and temperature of each mixed gas user. After being brought into the hydraulic simulation calculation model of the mixed gas network, the model equation is discretely solved according to the numerical calculation method. Preferably, the finite volume method can be used to discretize the pressure-velocity coupling equation to form a discrete equation group, and the equation is iteratively solved by the pressure prediction-correction method. During the solution process, the simulation calculation module needs to read in the calculation boundary condition data required by the pipeline network simulation calculation model, including the gas flow, pressure, temperature and gas data at the outlet of the mixing station, including CO, CO2, H2, CH4, C m H n , O2, N2 content; and the real-time detection data of the flow, pressure, and temperature of each mixed gas user. By solving the hydraulic calculation model of the gas pipeline network, the gas component data at each mixed gas user can be obtained, including CO, CO2, H2, CH4, C m H n , O2, N2 content, and the real-time calorific value of gas at each mixed gas user is calculated according to the following formula:

[0041]

[0042] Among them, CO, H2, CH4 and C m H n are the corresponding gas composition data (%) at each mixed gas user; H CO , They are CO, H2, CH4 and C m H n Calorific value (kJ / Nm 3 ).

[0043] The real-time calorific value data of each mixed gas user calculated by the gas network flow analysis module is transmitted to the mixed gas calorific value monitoring terminal through the network by the monitoring information transmission module.

[0044] The mixed gas calorific value monitoring terminal uses a computer software system to construct a visual interface to display the real-time monitoring information of the mixed gas calorific value, including the real-time monitoring data of the gas flow, pressure, temperature, and gas components at the outlet of the mixing station, the real-time monitoring data of the flow, pressure, and temperature of each mixed gas user, and the instantaneous simulation calculation results of the gas calorific value of each mixed gas user obtained by simulation calculation. Preferably, a system visualization screen can be constructed in combination with the actual system layout of the mixed gas pipeline network system, and the corresponding gas pressure, temperature, flow and calorific value data can be displayed at the corresponding position of the screen;

[0045] Preferably, the real-time simulation calculation results of the calorific value of each mixed gas user can also be transmitted to the combustion control program or system of each user as a necessary parameter for optimizing combustion control.

[0046] Accordingly, this embodiment also provides a mixed gas calorific value monitoring method, comprising:

[0047] 1) Collecting monitoring data of the mixed gas system and transmitting the monitoring data to the gas network flow analysis module and the mixed gas calorific value monitoring terminal;

[0048] 2) Perform mixed gas network simulation calculation based on the collected monitoring data of the mixed gas system to obtain the calculation data of the calorific value of each mixed gas user;

[0049] 3) Visually display the monitoring data of the mixed gas system and the calculated calorific value data of each mixed gas user through the mixed gas calorific value monitoring terminal.

[0050] Among them, the monitoring data of the mixed gas system includes the gas flow, pressure, temperature, gas composition data at the outlet of the gas mixing station and the flow, pressure and temperature data of each mixed gas user. The gas composition data includes CO, CO2, H2, CH4, C m H n , O2, N2.

[0051] The simulation calculation of the mixed gas pipeline network is based on the theoretical equation of pipeline hydraulic calculation. A hydraulic simulation calculation model of the mixed gas pipeline network is established according to the configuration conditions of the mixed gas pipeline network. The calorific value results of each mixed gas user are obtained by inputting the real-time monitoring data of the gas flow, pressure, temperature, gas components of the mixing station outlet and the flow, pressure and temperature of each mixed gas user through simulation calculation.

[0052] The theoretical equations for pipeline hydraulic calculation include the conservation equations for mass, momentum and energy of pipeline flow and the connection relationship equations for pipelines, valves, gas mixing stations and gas users; the configuration conditions of the mixed gas pipeline network include the length, outer diameter, wall thickness, absolute roughness of each section of the gas pipeline in the mixed gas pipeline network, the caliber, opening, flow characteristic parameters of each valve, the size and set operating parameters of each gas equipment, and the connection relationship parameters between pipelines, valves, gas mixing stations and gas users.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A mixed gas calorific value monitoring system, characterized in that: The system includes a gas mixing station parameter monitoring module, a mixed gas user monitoring module, a monitoring information transmission module, a gas pipe network flow analysis module and a mixed gas calorific value monitoring terminal; The gas mixing station parameter monitoring module and the mixed gas user monitoring module are connected to the gas network flow analysis module and the mixed gas calorific value monitoring terminal through the monitoring information transmission module; The gas mixing station parameter monitoring module uses a flow meter, a pressure gauge, a thermometer and a gas composition analyzer to monitor the gas flow, pressure, temperature and gas composition of the mixing station outlet in real time; the flow meter, pressure gauge, thermometer and gas composition analyzer used are installed on the main pipe at the outlet of the gas mixing station, and all the detection instruments installed on the main pipe at the outlet of the gas mixing station are collected by the monitoring information transmission module through the network through the network interface. The mixed gas user monitoring module uses a flow meter, a pressure meter, and a thermometer to monitor the flow, pressure, and temperature of each mixed gas user device in real time; the flow meter, pressure meter, and thermometer used are installed on the pipeline at the entrance of each mixed gas user device, and all the detection instruments installed on the pipeline at the entrance of each mixed gas user device are collected by the monitoring information transmission module through the network through the network interface. The monitoring information transmission module is used to collect monitoring values ​​at the gas mixing station and each mixed gas user equipment, and transmit them to the gas pipe network flow analysis module and the mixed gas calorific value monitoring terminal for analysis, calculation and visual display respectively; The gas network flow analysis module analyzes and calculates the received monitoring data, integrates the real-time monitoring data and the simulation calculation results for visual display on the mixed gas calorific value monitoring terminal; the gas network flow analysis module establishes a mixed gas network hydraulic simulation calculation model according to the configuration conditions of the mixed gas network.

2. The mixed gas calorific value monitoring system according to claim 1, characterized in that: The real-time calorific value of each mixed gas user is calculated based on the real-time monitoring data of the mixing station outlet gas flow, pressure, temperature, gas components and the flow, pressure and temperature of each mixed gas user equipment provided by the monitoring information transmission module, and the calculation result is transmitted to the mixed gas calorific value monitoring terminal.

3. The mixed gas calorific value monitoring system according to claim 2, characterized in that: The simulation calculation model is established based on the pipeline hydraulic calculation theory equations, including the mass, momentum and energy conservation equations of pipeline flow, and the connection relationship equations between valves and various gas equipment; the mixed gas pipeline network configuration conditions include the length, outer diameter, wall thickness, absolute roughness of each section of the gas pipeline in the mixed gas pipeline network, as well as the caliber, opening and flow characteristic parameters of each valve, the size and set operating parameters of each gas equipment, and the connection relationship parameters between pipelines, valves, gas mixing stations and gas user equipment.

4. The mixed gas calorific value monitoring system according to claim 1, characterized in that: The mixed gas calorific value monitoring terminal constructs a visual interface through a computer software system to display real-time monitoring information of the mixed gas calorific value, including real-time monitoring data of the gas flow, pressure, temperature, and gas components at the outlet of the mixing station, as well as real-time monitoring data of the flow, pressure, and temperature of each mixed gas user's equipment and instantaneous simulation calculation results of the gas calorific value of each mixed gas user obtained by simulation calculation.

5. A method for monitoring the calorific value of mixed gas, characterized in that: The method is implemented by using the mixed gas calorific value monitoring system according to any one of claims 1 to 4, and specifically comprises the following steps: S1: Collecting monitoring data of the mixed gas system, the monitoring information transmission module transmits the monitoring data to the gas network flow analysis module and the mixed gas calorific value monitoring terminal; S2: The gas network flow analysis module performs mixed gas network simulation calculation based on the collected mixed gas system monitoring data to obtain the calculation data of the calorific value of each mixed gas user; S3: Visually display the monitoring data of the mixed gas system and the calculated data of the calorific value of each mixed gas user through the mixed gas calorific value monitoring terminal.

6. The mixed gas calorific value monitoring method according to claim 5, characterized in that: In step S2, the gas network flow analysis module performs mixed gas network simulation calculations, specifically including: S21: establishing a hydraulic simulation calculation model of the mixed gas pipeline network according to the configuration conditions of the mixed gas pipeline network; S22: discretely solving the model equation according to the numerical calculation method to obtain the gas component content at each mixed gas user device, and combining the calorific value of each component in the gas to calculate the real-time calorific value of the gas at each mixed gas user.

7. The mixed gas calorific value monitoring method according to claim 6, characterized in that: In step S22, the model equation is discretely solved by a numerical calculation method, specifically including: using a finite volume method to discretize the pressure-velocity coupling equation to form a discrete equation group, and iteratively solving the equation through a pressure prediction-correction method.

8. The mixed gas calorific value monitoring method according to claim 6, characterized in that: In step S22, during the solution process, the simulation calculation module needs to read the calculation boundary condition data required by the pipe network hydraulic simulation calculation model, including the gas flow, pressure, temperature and gas data at the outlet of the mixing station, including CO, CO2, H2, CH4, C m H n , O2 and N2 content, as well as real-time detection data of flow, pressure and temperature at each mixed gas user equipment; Calculate the real-time calorific value of gas at each mixed gas user: Among them, CO, H2, CH4 and C m H n They are the corresponding gas component data of each mixed gas user; , , , They are CO, H2, CH4 and C m H n calorific value.

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