CN-122012835-A - Safety control system and control method for mixing oxygen before blast furnace blower

CN122012835ACN 122012835 ACN122012835 ACN 122012835ACN-122012835-A

Abstract

The application discloses a safety control system and a control method for mixing oxygen before a blast furnace blower, wherein the safety control system for mixing oxygen before the blast furnace blower comprises an air flow path, an oxygen flow path, a nitrogen flow path and a controller; the air flow path comprises an air pipeline, an air filter, an oxygen mixer, an oxygen content transmitter, a blower and a blast flow transmitter, the oxygen flow path comprises an oxygen pipeline, an oxygen filter, an oxygen purity transmitter, an oxygen pressure regulating valve, an oxygen pressure transmitter, an oxygen flow regulating valve, an oxygen flow transmitter, an oxygen quick-cut valve and an oxygen check valve, and the nitrogen flow path comprises a nitrogen pipeline, a nitrogen quick-open valve and a nitrogen check valve. The oxygen enrichment rate of the blast furnace can be directly controlled, the phenomenon of fluctuation of the oxygen enrichment rate of the blast furnace caused by the change of blast volume or the change of oxygen purity is reduced, and the safety of the blast furnace blower is improved.

Inventors

ZHAO LIUQIANG
CAI QIANG
LING CHEN
CHEN ENJUN
WANG WEIYE
YANG GUANGYU
ZHENG DI
NIU ZIYANG
ZHAO YAN
YUAN TONG

Assignees

首钢京唐钢铁联合有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. The front oxygen mixing safety control system of the blast furnace blower is characterized by comprising an air flow path, an oxygen flow path, a nitrogen flow path and a controller; The air flow path comprises an air pipeline, and an air filter, an oxygen mixer, an oxygen content transmitter, a blower and a blast flow transmitter which are sequentially connected in series on the air pipeline along the air circulation direction; The oxygen flow path comprises an oxygen pipeline, and an oxygen filter, an oxygen purity transmitter, an oxygen pressure regulating valve, an oxygen pressure transmitter, an oxygen flow regulating valve, an oxygen flow transmitter, an oxygen quick-cut valve and an oxygen check valve which are sequentially connected in series on the oxygen pipeline along the flowing direction of oxygen, wherein the output end of the oxygen pipeline is connected to the oxygen mixer; the nitrogen flow path comprises a nitrogen pipeline, and a nitrogen quick-opening valve and a nitrogen check valve which are sequentially connected in series on the nitrogen pipeline along the flowing direction of nitrogen, and the output end of the nitrogen pipeline is connected to the air pipeline; The controller respectively with oxygen content transmitter, blast flow transmitter, oxygen purity transmitter, oxygen pressure regulating valve, oxygen pressure transmitter, oxygen flow regulating valve, oxygen flow transmitter, oxygen quick cut valve with nitrogen gas quick cut valve electric connection, the controller is used for controlling according to oxygen content information, blast flow information and oxygen purity information oxygen pressure regulating valve oxygen flow regulating valve oxygen quick cut valve with nitrogen gas quick cut valve action.
2. The system according to claim 1, wherein a temperature transmitter is disposed on the air pipe, and the temperature transmitter is disposed on the rear side of the blower in the air flowing direction, and the temperature transmitter is electrically connected to the controller.
3. The system of claim 1, wherein the air line is connected with a sampling tube, and the oxygen content transmitter is mounted on the sampling tube.
4. The safety control system for mixing oxygen before a blast furnace blower according to claim 3, wherein at least two sampling pipes are arranged, two adjacent sampling pipes are arranged at an angle along the circumferential direction of the air pipeline, and the oxygen content transmitter is provided with at least two sampling pipes corresponding to the sampling pipes.
5. The system according to any one of claims 1 to 4, wherein an oxygen diffusing pipe is connected to the oxygen pipe, the oxygen diffusing pipe is located at the front side of the oxygen filter along the flowing direction of oxygen, an oxygen diffusing valve is arranged on the oxygen diffusing pipe, and the oxygen diffusing valve is electrically connected to the controller.
6. The blast furnace blower pre-machine mixed oxygen safety control system according to any one of claims 1 to 4, wherein the oxygen flow path further comprises an oxygen buffer tank, the oxygen buffer tank is connected with the oxygen pipeline through an oxygen buffer pipeline, the oxygen buffer pipeline is connected to a part of the oxygen pipeline between the oxygen filter and the oxygen purity transmitter, and an oxygen buffer tank stop valve is arranged on the oxygen buffer pipeline; the nitrogen flow path still includes the nitrogen buffer tank, the nitrogen buffer tank pass through the nitrogen buffer pipeline with the nitrogen pipeline is connected, and follows the circulation direction of nitrogen gas, the nitrogen buffer pipeline is connected the nitrogen pipeline is located the part of nitrogen gas quick-opening valve front side, be equipped with the nitrogen buffer tank stop valve on the nitrogen buffer pipeline.
7. The system of claim 1 to 4, wherein a first stop valve is provided in a portion of the oxygen pipe located on a front side of the oxygen filter in a flow direction of oxygen, a second stop valve is provided in a portion of the oxygen pipe located on a rear side of the oxygen check valve, and/or, Along the flow direction of nitrogen, the position that is located on the nitrogen gas pipeline the nitrogen gas is opened the valve front side soon is equipped with the third stop valve, is located the position of nitrogen gas check valve rear side is equipped with the fourth stop valve.
8. A blast furnace blower pre-machine mixed oxygen safety control method based on the blast furnace blower pre-machine mixed oxygen safety control system according to any one of claims 1-7, characterized in that the control method comprises: acquiring oxygen enrichment rate, blast flow information, oxygen purity information and oxygen content information required by a blast furnace; calculating oxygen demand flow according to the oxygen enrichment rate, the real-time blast flow information, the real-time oxygen purity information and the real-time oxygen content information required by the blast furnace; And controlling an oxygen flow regulating valve and/or an oxygen pressure regulating valve to act according to the oxygen demand flow so as to enable the oxygen flow to reach the oxygen demand flow.
9. The method according to claim 8, wherein after the controlling the operation of the oxygen flow regulating valve according to the oxygen demand flow so that the oxygen flow reaches the oxygen demand flow, the controlling method further comprises: Acquiring real-time oxygen content information; under the condition that the real-time oxygen content information exceeds a preset threshold value, controlling the oxygen quick-cut valve to be closed and controlling the nitrogen quick-open valve to be opened; And repeatedly executing the step of calculating the oxygen demand flow according to the oxygen enrichment rate required by the blast furnace, the real-time blast flow information, the real-time oxygen purity information and the real-time oxygen content information under the condition that the real-time oxygen content information is positioned in the set interval.
10. The method for controlling safety of pre-machine oxygen mixing of a blast furnace blower according to claim 8, wherein the control method further comprises: acquiring temperature information of an air outlet of the air blower; And under the condition that the temperature information exceeds a temperature threshold value, controlling the oxygen quick-cut valve to be closed and controlling the nitrogen quick-open valve to be opened.

Description

Safety control system and control method for mixing oxygen before blast furnace blower Technical Field The application belongs to the technical field of blast furnace blast mixing, and particularly relates to a front mixing oxygen safety control system and a control method of a blast furnace blower. Background A certain amount of oxygen with higher purity is added into the cold air of the blast furnace, so that the oxygen concentration in the cold air is increased, the smelting strength of the blast furnace can be improved, and the iron yield of the blast furnace is increased. However, after the oxygen concentration at the inlet of the blast furnace blower is increased, at least 3 problems are that 1, only the oxygen amount is controlled, the oxygen enrichment rate of the blast furnace cannot be directly controlled, when the blast amount is changed, the oxygen enrichment rate of the blast furnace fluctuates, 2, the pure oxygen flow is changed due to the change of the oxygen purity or the change of the oxygen pressure, so that the fluctuation of the oxygen enrichment rate of the blast furnace is large, and 3, the safety problem of the blast furnace blower is protected when the oxygen mixing device is abnormal or the blast furnace blower is stopped and other abnormal conditions occur. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the front oxygen mixing safety control system and the control method for the blast furnace blower, which can directly control the oxygen enrichment rate of the blast furnace, reduce the fluctuation phenomenon of the oxygen enrichment rate of the blast furnace caused by blast volume change or oxygen purity change, and improve the safety of the blast furnace blower. In a first aspect, the application provides a front-of-machine oxygen mixing safety control system of a blast furnace blower, which comprises an air flow path, an oxygen flow path, a nitrogen flow path and a controller; the air flow path comprises an air pipeline, and an air filter, an oxygen mixer, an oxygen content transmitter, a blower and a blast flow transmitter which are sequentially connected in series on the air pipeline along the air circulation direction; The oxygen flow path comprises an oxygen pipeline, and an oxygen filter, an oxygen purity transmitter, an oxygen pressure regulating valve, an oxygen pressure transmitter, an oxygen flow regulating valve, an oxygen flow transmitter, an oxygen quick-cut valve and an oxygen check valve which are sequentially connected in series on the oxygen pipeline along the flowing direction of oxygen, wherein the output end of the oxygen pipeline is connected to the oxygen mixer; The nitrogen flow path comprises a nitrogen pipeline, a nitrogen quick-opening valve and a nitrogen check valve which are sequentially connected in series on the nitrogen pipeline along the flowing direction of nitrogen, and the output end of the nitrogen pipeline is connected to the air pipeline; The controller is respectively and electrically connected with the oxygen content transmitter, the blast flow transmitter, the oxygen purity transmitter, the oxygen pressure regulating valve, the oxygen pressure transmitter, the oxygen flow regulating valve, the oxygen flow transmitter, the oxygen quick-cut valve and the nitrogen quick-open valve, and is used for controlling the actions of the oxygen pressure regulating valve, the oxygen flow regulating valve, the oxygen quick-cut valve and the nitrogen quick-open valve according to the oxygen content information, the blast flow information and the oxygen purity information. According to the front oxygen mixing safety control system of the blast furnace blower, the oxygen pressure regulating valve and the oxygen flow regulating valve are arranged to form serial regulation, so that the oxygen flow regulation is more stable, and meanwhile, the oxygen purity transmitter is connected, the flow is conveniently corrected, and the pure oxygen flow mixed into the blower is more stable. Through setting up oxygen content changer to with oxygen quick cut valve and nitrogen gas quick open valve cooperation, let in nitrogen gas and dilute the interior oxygen content of blast furnace air-blower fast, prevent to cause incident such as conflagration because the oxygen concentration is too high in the mixed gas that gets into the blast furnace air-blower, thereby guarantee the safe operation of blast furnace air-blower. According to one embodiment of the application, a temperature transmitter is arranged on the air pipeline, and the temperature transmitter is arranged on the rear side of the blower along the air circulation direction and is electrically connected with the controller. According to one embodiment of the application, a sampling tube is connected to the air line, and an oxygen content transmitter is mounted on the sampling tube. According to one e