CN-115307451-B - Control method and device for RH refining furnace vacuum chamber heating system and storage medium

CN115307451BCN 115307451 BCN115307451 BCN 115307451BCN-115307451-B

Abstract

The invention provides a control method, a device and a storage medium of a vacuum chamber heating system of an RH refining furnace, wherein the method comprises the steps of receiving selection of a heating mode and setting of a first heating parameter threshold and a second heating parameter threshold when the temperature of the vacuum chamber is above a temperature threshold, starting an ignition program, opening a nitrogen and cooling water cut-off valve, controlling a top lance to descend to an ignition position, closing a purging cut-off valve, opening an oxygen cut-off valve, an oxygen flow regulating valve, a gas cut-off valve and a gas flow regulating valve, and igniting a burner. The technical scheme is utilized to realize automatic control of a RH refining furnace vacuum chamber heating system, improve the energy saving and emission reduction efficiency of equipment, and ensure the safety of the production process by monitoring the running state.

Inventors

HOU ZEYUE
LI JIAFU
JIANG JING
ZHU BINGQUAN
XU HAIZHEN
LOU ZHANFENG

Assignees

中冶南方工程技术有限公司

Dates

Publication Date: 20260505
Application Date: 20220707

Claims (8)

1. The control method of the RH refining furnace vacuum chamber heating system comprises a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top lance lifting executing mechanism, a burner and a flame detector, wherein the flame detector is arranged at the top of the top lance, the burner is arranged at the bottom of the top lance, the top lance is arranged above a vacuum chamber, a top lance lifting motor and a top lance position detection device are arranged on the top lance lifting executing mechanism, the nitrogen pipeline is connected with the oxygen pipeline through a first cut-off valve, the nitrogen pipeline is connected with the gas pipeline through a second cut-off valve, an oxygen cut-off valve and an oxygen flow regulating valve are further arranged on the oxygen pipeline, a gas cut-off valve and a gas flow regulating valve are further arranged on the gas pipeline, and a third cut-off valve is arranged on the cooling water inlet pipeline, and the control method is characterized in that: S1, when the vacuum chamber reaches or exceeds a preset temperature threshold, responding to selection of a heating mode, and receiving first heating parameter threshold and second heating parameter threshold corresponding to the selected heating mode; S2, responding to the starting of heating ignition, opening the first cut-off valve and the second cut-off valve, and simultaneously purging nitrogen in the oxygen pipeline and the gas pipeline; S3, opening the third cut-off valve to enable cooling water to flow in through the cooling water inlet pipeline; S4, controlling the top lance lifting executing mechanism to act so that the top lance descends, closing the first cut-off valve and the second cut-off valve when the top lance descends to a preset ignition position, and opening the oxygen cut-off valve and the oxygen flow regulating valve; s5, when the oxygen flow reaches a preset oxygen flow value, opening the gas cut-off valve and the gas flow regulating valve; S6, when the gas flow reaches a preset gas flow value, igniting the burner; S7, when the flame detector detects flame, collecting a first heating parameter value corresponding to a set first heating parameter threshold according to the selected heating mode, and when the first heating parameter value reaches the first heating parameter threshold, closing the oxygen shut-off valve and the fuel gas shut-off valve, and opening the first shut-off valve and the second shut-off valve to enable nitrogen to purge the oxygen pipeline and the fuel gas pipeline; S8, controlling the top lance lifting executing mechanism to act, so that the top lance is lifted, when the top lance reaches a preset waiting position, collecting a second heating parameter value corresponding to a set second heating parameter threshold, and executing heating ignition when the second heating parameter value meets a preset condition compared with the second heating parameter threshold; the heating mode comprises a temperature mode and a time mode, wherein a first heating parameter corresponding to the time mode is combustion time, a second heating parameter corresponding to the time mode is flameout time, the first heating parameter corresponding to the temperature mode is flameout temperature, and the second heating parameter is ignition temperature; the method further comprises the step of diagnosing the top gun and the top gun lifting executing mechanism before the step S1, and the step S1 is executed after the diagnosis is passed.
2. The control method according to claim 1, wherein when the selected heating mode is a time mode, the step S7 is specifically to start a combustion timer to count when the flame detector detects a flame, close the oxygen shut-off valve and the gas shut-off valve when the combustion timer counts up to a set combustion time, open the first shut-off valve and the second shut-off valve to purge the oxygen pipe and the gas pipe with nitrogen, and control the top lance lifting/lowering actuator to operate so that the top lance is lifted up to a predetermined waiting position, start a flameout timer to count when the combustion timer counts up to a set flameout time, and perform heating ignition when the combustion timer counts up to the set flameout time.
3. The control method according to claim 1, wherein when the selected heating mode is a temperature mode, the step S7 is specifically to collect the temperature of the vacuum chamber when the flame detector detects a flame, close the oxygen shut-off valve and the gas shut-off valve when the temperature of the vacuum chamber reaches a set flameout temperature, open the first shut-off valve and the second shut-off valve to flameout the burner and purge the oxygen pipe and the gas pipe with nitrogen, and the step S8 is specifically to control the top lance lifting actuator to operate so that the top lance is lifted up to a predetermined waiting position, collect the temperature of the vacuum chamber, and perform heating ignition when the temperature of the vacuum chamber is less than the set ignition temperature.
4. The control method of claim 1, wherein the heating system further comprises a thermocouple disposed within the vacuum chamber for acquiring the temperature of the vacuum chamber.
5. The control method of claim 2, wherein the heating system further comprises a failure mode, the control method comprising: In the control process, if one or more of the oxygen cut-off valve, the fuel gas cut-off valve and the third cut-off valve generate fault alarm, the heating system enters a fault mode, in the fault mode, the oxygen cut-off valve and the fuel gas cut-off valve are closed, a burner is extinguished, the first cut-off valve and the second cut-off valve are opened, so that nitrogen blows the oxygen pipeline and the fuel gas pipeline, wherein when the selected heating mode is a time mode, the heating system further comprises resetting the combustion timer and the flameout timer; And in the fault mode, closing the oxygen shut-off valve and the gas shut-off valve, extinguishing a burner, opening the first shut-off valve and the second shut-off valve, and purging the oxygen pipeline and the gas pipeline with nitrogen.
6. The control method of claim 1, wherein the heating system further comprises a failure mode, the control method comprising: In the step S7, if the flame detector does not detect a flame or fails to alarm, the heating system enters the failure mode, in the failure mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened, so that the oxygen pipeline and the gas pipeline are purged by nitrogen.
7. A control device of an RH refining furnace vacuum chamber heating system, characterized by comprising a memory and a processor, the memory storing at least one program, the at least one program being executed by the processor to implement the control method of an RH refining furnace vacuum chamber heating system according to any of claims 1 to 6.
8. A computer-readable storage medium, wherein at least one program is stored in the storage medium, the at least one program being executed by a processor to implement a method of controlling the RH refining furnace vacuum chamber heating system of any of claims 1 to 6.

Description

Control method and device for RH refining furnace vacuum chamber heating system and storage medium Technical Field The invention relates to the field of heating of vacuum chambers of refining furnaces, in particular to a control method and device of a heating system of a vacuum chamber of an RH refining furnace and a storage medium. Background The steel production is an industry with more carbon emission, and under the dual requirements of carbon neutralization and productivity, the energy conservation and emission reduction face a great challenge. At present, the heating of the vacuum chamber needs micro positive pressure control, the outlet of the insertion tube needs flame wrapping, the fuel gas consumption is large, if the heating is carried out by adopting low-flow fuel gas combustion, the vacuum chamber cannot form effective positive pressure control, the insertion tube does not emit flame, the temperature difference between the inner and outer walls of the tube wall is large, and the outer wall is easy to crust during normal production. Therefore, how to improve the use efficiency of the heating fuel in the vacuum chamber and reduce the occurrence probability of production accidents while realizing effective heating of the vacuum chamber is a problem to be solved at present, and in addition, manual management in the refining process is more common and has lower efficiency. Disclosure of Invention The embodiment of the invention provides a control method, a control device and a storage medium for a vacuum chamber heating system of an RH refining furnace, which are used for solving the problems of low fuel use efficiency and more production management manpower flows. In order to achieve the above purpose, in one aspect, a control method of a vacuum chamber heating system of an RH refining furnace is provided, wherein the heating system comprises a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top gun lifting executing mechanism, a burner and a flame detector, the nitrogen pipeline is connected with the oxygen pipeline through a first cut-off valve, the nitrogen pipeline is connected with the gas pipeline through a second cut-off valve, an oxygen cut-off valve and an oxygen flow regulating valve are further arranged on the oxygen pipeline, a gas cut-off valve and a gas flow regulating valve are further arranged on the gas pipeline, and a third cut-off valve is arranged on the cooling water inlet pipeline, and the control method comprises: S1, when the vacuum chamber reaches or exceeds a preset temperature threshold, responding to selection of a heating mode, and receiving first heating parameter threshold and second heating parameter threshold corresponding to the selected heating mode; S2, responding to the starting of heating ignition, opening the first cut-off valve and the second cut-off valve, and simultaneously purging nitrogen in the oxygen pipeline and the gas pipeline; S3, opening the third cut-off valve to enable cooling water to flow in through the cooling water inlet pipeline; S4, controlling the top lance lifting executing mechanism to act so that the top lance descends, closing the first cut-off valve and the second cut-off valve when the top lance descends to a preset ignition position, and opening the oxygen cut-off valve and the oxygen flow regulating valve; s5, when the oxygen flow reaches a preset oxygen flow value, opening the gas cut-off valve and the gas flow regulating valve; S6, when the gas flow reaches a preset gas flow value, igniting the burner; S7, when the flame detector detects flame, collecting a first heating parameter value corresponding to a set first heating parameter threshold according to the selected heating mode, and when the first heating parameter value reaches the first heating parameter threshold, closing the oxygen shut-off valve and the fuel gas shut-off valve, and opening the first shut-off valve and the second shut-off valve to enable nitrogen to purge the oxygen pipeline and the fuel gas pipeline; And S8, controlling the top lance lifting executing mechanism to act, so that the top lance is lifted, when the top lance reaches a preset waiting position, collecting a second heating parameter value corresponding to the set second heating parameter threshold, and executing heating ignition when the second heating parameter value is compared with the second heating parameter threshold to meet a preset condition. Further, in the control method, the heating mode comprises a temperature mode and a time mode, the first heating parameter corresponding to the time mode is combustion time, the second heating parameter is flameout time, the first heating parameter corresponding to the temperature mode is flameout temperature, and the second heating parameter is ignition temperature. In the control method, when the selected heating mode is a time mode, the step S7 is specifically that when the f