CN-121977363-A - Composite control method and system for oxygen content and furnace pressure in hydrogen furnace

CN121977363ACN 121977363 ACN121977363 ACN 121977363ACN-121977363-A

Abstract

The application discloses a compound control method and a system for oxygen content and furnace pressure in a hydrogen furnace, wherein the method comprises the steps of acquiring oxygen information, pressure information and hydrogen flow information of a hydrogen furnace in and out of the hydrogen furnace in real time, determining the type of a trigger regulation mode according to the oxygen information and the pressure information, triggering the oxygen control regulation mode when the oxygen information is larger than an oxygen safety control parameter, triggering the pressure control regulation mode when the pressure information exceeds a pressure safety constraint condition, maintaining a steady-state regulation mode when the oxygen information and the pressure information are in a normal state, obtaining the opening of an air inlet regulation valve and/or an air outlet regulation valve arranged at an inlet and an outlet of the hydrogen furnace according to the determined regulation mode through cooperative calculation of the hydrogen flow information, the oxygen information and the pressure information, and regulating the opening of the air inlet regulation valve and/or the air outlet regulation valve. The application can solve the problem that the oxygen content and the pressure control are mutually independent and cannot be regulated and controlled cooperatively in the existing hydrogen furnace pressure control system.

Inventors

ZHANG WENLIANG
ZHANG YIHUI
LUO PING
WU JIALONG
LIU JUNJIE
YANG TAO
Shi Yuezhang
FANG JUNBO
YU AIQI

Assignees

中国机械总院集团北京机电研究所有限公司

Dates

Publication Date: 20260505
Application Date: 20260104

Claims (10)

1. A method for the combined control of oxygen content and furnace pressure in a hydrogen furnace comprising: acquiring oxygen information and pressure information in the hydrogen furnace and hydrogen flow information entering and exiting the hydrogen furnace in real time; Determining the type of a trigger regulation mode according to the oxygen information and the pressure information, wherein the regulation mode comprises an oxygen control regulation mode, a pressure control regulation mode and a steady state regulation mode; When the oxygen information is larger than the oxygen safety control parameter, triggering the oxygen control regulation mode, When the pressure information exceeds the pressure safety constraint condition, triggering the pressure control and regulation mode, Maintaining the steady state regulation mode when both the oxygen information and the pressure information are in a normal state; According to the determined triggering regulation mode, the opening information of an air inlet regulation valve and/or an air outlet regulation valve arranged at the inlet and outlet of the hydrogen furnace is obtained through cooperative calculation of the hydrogen flow information, the oxygen information and the pressure information; and adjusting the opening degree of the air inlet adjusting valve and/or the air outlet adjusting valve according to the calculated opening degree information of the air inlet adjusting valve and/or the air outlet adjusting valve.
2. The method for combined control of oxygen content and furnace pressure in a hydrogen furnace according to claim 1, wherein triggering the oxygen control adjustment mode when the oxygen information is greater than an oxygen safety control parameter comprises: the oxygen information comprises real-time oxygen concentration and oxygen concentration change rate, and the oxygen safety control parameters comprise an oxygen safety threshold value and an oxygen change rate threshold value; And triggering the oxygen control regulation mode when the real-time oxygen concentration is greater than the oxygen safety threshold and the oxygen concentration change rate is greater than the oxygen change rate threshold.
3. The method for combined control of oxygen content and furnace pressure in a hydrogen furnace according to claim 2, wherein said triggering the oxygen control adjustment mode when the real-time oxygen concentration is greater than the oxygen safety threshold and the oxygen concentration change rate is greater than the oxygen change rate threshold comprises: Calculating to obtain opening information of the air inlet regulating valve according to the oxygen concentration deviation between the current real-time oxygen concentration and an oxygen concentration target set value; Predicting to obtain the pressure rising trend in the hearth according to the currently obtained hydrogen flow information and the opening information of the air inlet regulating valve; and determining opening information of the exhaust regulating valve which needs to be finely adjusted in advance according to the pressure rising trend.
4. The method for combined control of oxygen content in a hydrogen furnace and furnace pressure according to claim 3, wherein said triggering the pressure control adjustment mode when the pressure information exceeds a pressure safety constraint condition comprises: The pressure information comprises real-time pressure and pressure change rate, and the pressure safety constraint condition comprises a pressure safety range and a pressure change rate threshold, wherein the pressure safety range is defined by a pressure safety upper limit and a pressure safety lower limit; And triggering the pressure control and regulation mode when the real-time pressure exceeds the pressure safety range and the pressure change rate is larger than the pressure change rate threshold.
5. The method for combined control of oxygen content and furnace pressure in a hydrogen furnace according to claim 4, wherein said triggering the pressure control adjustment mode when the real-time pressure exceeds the pressure safety range and the pressure change rate is greater than the pressure change rate threshold value comprises: calculating to obtain opening information of the exhaust regulating valve according to the pressure deviation between the current real-time pressure and a pressure target set value; and monitoring and collecting the oxygen concentration and hydrogen consumption information in the hearth in real time, and determining the opening information of the air inlet regulating valve or limiting and adjusting the opening information of the air outlet regulating valve.
6. The method according to claim 5, wherein the steady-state adjustment mode includes maintaining a current opening degree of the intake air adjustment valve and/or the exhaust gas adjustment valve or fine-tuning the current opening degree of the intake air adjustment valve and/or the exhaust gas adjustment valve.
7. The method for compositely controlling the oxygen content and the furnace pressure in the hydrogen furnace according to claim 6, wherein the fine tuning of the current opening of the intake regulating valve and/or the exhaust regulating valve comprises: and when the current real-time oxygen concentration deviates from an oxygen concentration target set value or the current real-time pressure deviates from a pressure target set value, calculating to obtain the trimming correction amplitude of the opening of the air inlet regulating valve and/or the air outlet regulating valve according to the oxygen concentration deviation or the pressure deviation.
8. A compound control system for oxygen content and furnace pressure in a hydrogen furnace is characterized by comprising a sensing unit, an execution unit and a control core unit, wherein the sensing unit transmits information acquired in real time to the control core unit, the control core unit transmits a result instruction to the execution unit, The sensing unit comprises a pressure sensor arranged in the hydrogen furnace, an oxygen analysis probe, a hydrogen gas inlet flowmeter arranged at the inlet of the hydrogen furnace and a hydrogen gas outlet flowmeter arranged at the outlet of the hydrogen furnace; The execution unit comprises an air inlet regulating valve and an air outlet regulating valve which are arranged at the inlet and outlet of the hydrogen furnace, wherein the air inlet regulating valve is arranged at the outer side of the hydrogen air inlet flowmeter, and the air outlet regulating valve is arranged at the inner side of the hydrogen air outlet flowmeter; The control core unit comprises a hardware control platform, a composite control algorithm module and a communication module, wherein the composite control algorithm module and the communication module are packaged in the hardware control platform, the composite control algorithm module is configured to execute the composite control method according to any one of claims 1 to 7 so as to realize cooperative closed-loop control of the oxygen content in the hydrogen furnace and the hearth pressure, and the communication module is used for establishing a data communication link with an upper computer human-computer interface and a factory distributed control system.
9. The composite control system for oxygen content and furnace pressure in a hydrogen furnace according to claim 8, wherein the composite control algorithm module comprises a main control sub-module, a feedforward compensation sub-module and a safety guarantee sub-module; the main control sub-module is used for generating an opening instruction of the air inlet regulating valve or the air outlet regulating valve according to the oxygen concentration deviation or the pressure deviation; The feedforward compensation submodule is used for generating a compensation opening instruction of the exhaust regulating valve based on the hydrogen inlet flow; The safety guarantee submodule is used for generating an opening instruction of the air inlet regulating valve or limiting and adjusting the opening instruction of the air outlet regulating valve based on the net flow and the pressure change trend of the hydrogen.
10. A computer program product comprising program instructions which, when executed by a computer, cause the computer to perform the composite control method of any one of claims 1 to 7.

Description

Composite control method and system for oxygen content and furnace pressure in hydrogen furnace Technical Field The application relates to the technical field of hydrogen furnace gas control, in particular to a compound control method and system for oxygen content and furnace pressure in a hydrogen furnace. Background The hydrogen furnace is used as a key heat treatment device and is widely applied to the industrial fields of metal material annealing, sintering, special alloy preparation and the like. The core process depends on the stable reducing atmosphere formed and maintained in the furnace, and high-purity hydrogen is used as a protective gas to prevent the material from being oxidized at high temperature, so that the mechanical property, microstructure and surface quality of the material after heat treatment are ensured to meet the process requirements. However, in the actual operation process of the hydrogen furnace, the oxygen content and the internal pressure of the atmosphere in the furnace directly determine the success or failure of the heat treatment process, and also have a great influence on the safe operation of the equipment. At present, most hydrogen furnace pressure control systems have control independence, oxygen content and pressure control are mutually independent, when the oxygen concentration is increased and the hydrogen gas inflow is required to be increased, the pressure in the furnace is suddenly increased, and the traditional independent control mode cannot coordinate two parameters synchronously, so that when one parameter is regulated, the other parameter is severely fluctuated, and the stability of equipment is affected. Therefore, a compound control method and device capable of monitoring the oxygen content and the pressure in the furnace in real time and realizing the cooperative regulation and control of two parameters are needed to be designed, so that the problems in the prior art are solved. Disclosure of Invention Therefore, the main purpose of the application is to provide a compound control method for the oxygen content and the pressure in the hydrogen furnace, which is favorable for solving the problem that the oxygen content and the pressure are mutually independent and cannot be regulated and controlled cooperatively in the existing hydrogen furnace pressure control system. In a first aspect, the present application provides a method for the complex control of oxygen content in a hydrogen furnace with furnace pressure, comprising: The method comprises the steps of acquiring oxygen information, pressure information and hydrogen flow information entering and exiting a hydrogen furnace in real time, determining the types of triggering regulation modes according to the oxygen information and the pressure information, wherein the regulation modes comprise an oxygen control regulation mode, a pressure control regulation mode and a steady state regulation mode, triggering the oxygen control regulation mode when the oxygen information is larger than oxygen safety control parameters, triggering the pressure control regulation mode when the pressure information exceeds pressure safety constraint conditions, maintaining the steady state regulation mode when the oxygen information and the pressure information are in a normal state, obtaining opening information of an air inlet regulation valve and/or an air outlet regulation valve arranged at an inlet and an outlet of the hydrogen furnace through cooperative calculation of the hydrogen flow information, the oxygen information and the pressure information according to the determined triggering regulation mode, and regulating the opening of the air inlet regulation valve and/or the air outlet regulation valve according to the opening information of the air inlet regulation valve and/or the air outlet regulation valve obtained through calculation. By the method, the oxygen concentration and the pressure change in the hearth and the hydrogen inlet and outlet flow outside the hearth can be monitored in real time, and the oxygen concentration and the pressure in the hearth are dynamically and cooperatively regulated and controlled in a compound mode, so that the oxygen concentration and the pressure are always maintained in an absolute safe setting range. By adopting a PID algorithm, the opening of an air inlet regulating valve or an air outlet regulating valve is accurately controlled by utilizing the cooperative calculation and safety correction of the oxygen information, the pressure information and the hydrogen flow information which are acquired in real time, so that the stability of the working condition in a hearth is ensured, and more comprehensive information is provided for the algorithm by monitoring the real-time flow of hydrogen. Through the oxygen concentration and the pressure in the real-time supervision hydrogen furnace, trigger immediately and accuse oxygen regulation mode when oxygen concentration surpasses saf