Air supply signal fault detection and fault removal method for hot blast stove

Abstract

The invention discloses a hot blast stove air supply signal fault detection and troubleshooting method, which comprises the following steps: arranging a cold air pressure measuring point on a cold air pipe of a hot blast stove, monitoring the pressure N1 of the cold air pipe in real time, arranging a hot air pressure measuring point on a hot air pipe of the hot blast stove, and monitoring the pressure N2 of the hot air pipe in real time. In the switching process of the working state of the hot-blast stove, after an air supply signal indicating that a cold air valve and a hot air valve of the original burning hot-blast stove are opened in place is obtained, the pressure condition in the hot-blast stove can be judged according to N1-N2 obtained through real-time monitoring, and then whether the cold air valve and the hot air valve of the hot-blast stove are normally opened in place or not is judged; and whether a cold blast valve of the original burning hot blast stove and an air supply signal for opening the hot blast valve in place fail is detected, so that safety production accidents such as blast furnace tuyere slag filling, hot blast stove pressure building and blast furnace blower surge are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of iron-making blast furnaces, and in particular to a method for detecting and troubleshooting a hot blast stove air supply signal fault. Background Art

[0002] During the blast furnace smelting process, hot air needs to be continuously fed into the blast furnace. The hot air serves as a catalyst to promote the reaction of iron ore in the blast furnace. The hot air fed into the blast furnace is provided by a hot blast furnace system. As disclosed in the patent document of Chinese patent application No. 202210511393.7, the hot blast furnace system generally includes three hot blast furnaces, that is, one blast furnace is equipped with three hot blast furnaces, and the three hot blast furnaces are connected in parallel between the blast furnace and the blast furnace blower. Specifically, in addition to the gas end and the air end, each hot blast furnace is provided with a cold blast end and a hot blast end, wherein the cold blast end is provided with a cold blast pipe and an equalizing pipe, and the cold blast pipe and the equalizing pipe are connected in parallel between the hot blast furnace and the blast furnace blower, and a cold blast valve is installed on the cold blast pipe, and an equalizing valve is installed on the equalizing pipe; the hot blast end is connected to the blast furnace through a hot blast pipe, and a hot blast valve is installed on the hot blast pipe. By controlling the relevant valves of the hot blast stove, the hot blast stove can have a combustion heat storage state and an air supply state. In the combustion heat storage state, gas and air are introduced into the hot blast stove from the gas end and the air end, and combustion is carried out in the hot blast stove; in the air supply state, the cold air valve and the hot air valve are opened, and air is supplied from the hot blast stove to the blast furnace under the power of the blast furnace blower.

[0003] Three hot blast furnaces are arranged in parallel between the blast furnace and the blast furnace blower. Each hot blast furnace supplies air and takes turns to provide hot air to the blast furnace. That is to say, each time one hot blast furnace is in the air supply state, the other two hot blast furnaces are in the combustion and heat storage state. In this way, by switching the working state of the hot blast furnace, the three hot blast furnaces can supply air in turn. The switching process of the working states of the three hot blast stoves takes the air supply from the first hot blast stove to the air supply from the second hot blast stove as an example. Specifically, after the temperature in the second hot blast stove reaches the set temperature after combustion, the pressure equalizing valve of the second hot blast stove is opened, and the second hot blast stove is pressurized under the power of the blast furnace blower. After the pressure at the cold air end and the hot air end of the second hot blast stove is balanced, the cold air valve and the hot air valve of the second hot blast stove are opened to switch the second hot blast stove from the combustion heat storage state to the air supply state; the cold air valve and the hot air valve of the second hot blast stove are opened in place, and after receiving the air supply signal indicating that the cold air valve and the hot air valve of the second hot blast stove are opened in place, the hot air valve and the cold air valve of the first hot blast stove are closed in sequence, and then the exhaust gas in the first hot blast stove is discharged, and gas and air are introduced into the first hot blast stove from the gas end and the air end to switch the first hot blast stove from the air supply state to the combustion heat storage state.

[0004] From the switching process of the working state of the hot blast furnace described above, it can be seen that the basis for the original hot blast furnace (the first hot blast furnace in the above example) to switch from the air supply state to the combustion heat storage state is that the air supply signal of the hot blast furnace (the second hot blast furnace in the above example) that the cold air valve and the hot air valve are fully opened is received. The working state of the hot blast furnace can be smoothly switched, which is based on the fact that the air supply signal is a real signal, that is, when the air supply signal of the cold air valve and the hot air valve of the hot blast furnace (the second hot blast furnace in the above example) that the cold air valve and the hot air valve of the hot blast furnace (the second hot blast furnace in the above example) that the current air supply is fully opened is received. However, during the production process, due to various reasons, each air supply signal received is not always real, and there may be a fault, which is a false signal, that is, although the air supply signal is received, the cold air valve and the hot air valve of the hot blast furnace (the second hot blast furnace in the above example) that the current air supply is fully opened are not actually opened.

[0005] Once the received air supply signal fails and becomes a false signal, the cold air valve and hot air valve of the hot blast furnace currently supplying air (the second hot blast furnace in the above example) are not truly opened, and the original hot blast furnace (the first hot blast furnace in the above example) switches from the air supply state to the combustion heat storage state. At this time, the air supply from the hot blast furnace to the blast furnace is reduced, and the wind pressure and air volume in the blast furnace decrease, which can easily cause slag filling in the blast furnace tuyere, especially when the cold air valve of the hot blast furnace currently supplying air (the second hot blast furnace in the above example) is normally opened, and the hot blast valve is not truly opened, the blast furnace blower has been supplying air to the hot blast furnace currently supplying air (the second hot blast furnace in the above example). The hot blast furnace currently supplying air (the second hot blast furnace in the above example) lacks an outlet because the hot blast valve is not truly opened. In this case, the hot blast furnace will be pressurized and there is a risk of explosion in the hot blast furnace. At the same time, the high pressure in the hot blast furnace will be reversed to the blast furnace blower, causing the blast furnace blower to surge, resulting in serious production safety accidents. Summary of the invention

[0006] The object of the present invention is to provide a method for detecting and troubleshooting a hot blast stove air supply signal fault.

[0007] The technical solution to achieve the purpose of the present invention is: a hot blast stove air supply signal fault detection and troubleshooting method, which is applied to a hot blast stove system that provides hot air for a blast furnace, comprising the following steps: S1 hot blast furnace system hot blast furnace cold air duct set cold air pressure measuring point, the cold air pressure measuring point real-time monitoring of the cold air duct pressure, real-time monitoring of the cold air duct pressure is N1; A hot air pressure measuring point is arranged on the hot air pipe of the hot air furnace in the hot air furnace system, and the hot air pressure measuring point monitors the pressure of the hot air pipe in real time, and the pressure N2 of the hot air pipe is monitored in real time; The absolute value of the pressure difference between N1 and N2 is |N1-N2|; S2. Set parameter M1, M1 is a non-negative number; S3. When the original hot air furnace with air supply switches from the air supply state to the combustion heat storage state, the hot air furnace control system obtains the air supply signal of the cold air valve and the hot air valve of the original combustion hot air furnace, and then detects whether the air supply signal of the cold air valve and the hot air valve of the original combustion hot air furnace is faulty according to | N1-N2 | obtained by real-time monitoring: If | N1-N2 | is greater than parameter M1, the hot blast stove control system determines that the air supply signal failure of the cold air valve and the hot air valve of the original burning hot blast stove is in full open position. At this time, the hot blast stove control system controls the hot air valve and the cold air valve of the original hot blast stove to stop closing the hot air valve and the cold air valve of the original hot blast stove; at the same time, the hot blast stove control system controls to send out an alarm signal. After receiving the alarm signal, the operator manually opens the hot air valve and the cold air valve of the original hot blast stove to eliminate the failure of the air supply signal.

[0008] Furthermore, parameter M1 is not greater than 9Kpa. The setting value of parameter M1 is directly related to the sensitivity of air supply signal fault detection. The larger the value of parameter M1, the lower the detection sensitivity; the smaller the value of parameter M1, the higher the detection sensitivity.

[0009] Further, the parameter M1 is any value between 5 Kpa and 8 Kpa. The smaller the value of the parameter M1 is, the higher the detection sensitivity is. However, with a higher sensitivity, the normal fluctuation of the hot air pipe and the pressure of the hot air pipe is also easily regarded as a fault. To eliminate this situation, preferably, the parameter M1 is any value between 5 Kpa and 8 Kpa.

[0010] Furthermore, in the hot blast furnace system, the blast furnace blower and the blast furnace are also connected by a mixed air pipe, and a mixed air regulating valve is installed on the mixed air pipe. After the blast furnace blower and the blast furnace are directly connected through the mixed air pipe, when the air supply signal fails and the hot blast furnace is under high pressure, if the cold air valve of the hot blast furnace is normally opened, and the hot air valve of the hot blast furnace fails and is not fully opened, resulting in high pressure in the hot blast furnace, the mixed air regulating valve can be opened so that the cold air of the blast furnace blower can directly enter the blast furnace through the mixed air pipe instead of entering the hot blast furnace, thereby avoiding the risk of explosion caused by excessive pressure in the hot blast furnace due to pressure holding, and reducing the accident level caused by the air supply signal failure.

[0011] Furthermore, the hot blast furnace air supply signal fault detection and troubleshooting method also includes step S4, which is: setting parameter M2, M2 is a non-negative number; if N1 is greater than parameter M2, the hot blast furnace control system controls the mixed air regulating valve to open. After real-time monitoring of the pressure of the cold air duct, the real-time monitored pressure of the cold air duct is compared with the set parameter M2. When N1 is greater than parameter M2, the mixed air regulating valve is controlled to open automatically, so as to realize the interlocking of the pressure of the cold air duct and the mixed air regulating valve, and eliminate the risk of pressure build-up in the hot blast furnace.

[0012] Further, parameter M2 is any value between 410Kpa and 450Kpa. Considering the pressure of the cold air duct under normal working and the pressure of the cold air duct when the hot air furnace is under pressure, combined with actual conditions, preferably, parameter M2 is any value between 410Kpa and 450Kpa.

[0013] Furthermore, the cold air pressure measuring point is a pressure sensor installed on the cold air pipe of the hot air stove.

[0014] Furthermore, the hot air pressure measuring point is a pressure sensor installed on the hot air pipe of the hot air stove.

[0015] The method for detecting and troubleshooting faults of air supply signals of hot blast stoves of the present invention provides a cold air pressure measuring point on the cold air pipe of the hot blast stove to monitor the pressure N1 of the cold air pipe in real time, and provides a hot air pressure measuring point on the hot air pipe of the hot blast stove to monitor the pressure N2 of the hot air pipe in real time, so that in the switching process of the working state of the hot blast stove, after obtaining the air supply signals of the cold air valve and the hot air valve of the original burning hot blast stove being fully opened, the pressure condition in the hot blast stove can be judged according to |N1-N2| obtained by real-time monitoring, and then it can be judged whether the cold air valve and the hot air valve of the hot blast stove are normally opened, and it can be detected whether the air supply signals of the cold air valve and the hot air valve of the original burning hot blast stove being fully opened are faulty. And when |N1-N2| is greater than parameter M1, it is judged that the air supply signal failure of the cold air valve and the hot air valve of the original burning hot blast furnace is in full opening, and the closing action of the hot air valve and the cold air valve of the original hot blast furnace is stopped immediately to prevent the hot air valve and the cold air valve of the hot blast furnace from being completely closed, which leads to the increase of pressure in the hot blast furnace. At the same time, the hot blast furnace system has an alarm function, through the prompt of the alarm signal, so that the operator can manually open the hot air valve and the cold air valve of the original hot blast furnace to completely eliminate the failure of the air supply signal, and avoid the occurrence of safety accidents such as slag filling at the blast furnace tuyere, pressure holding of the hot blast furnace, and surging of the blast furnace blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a hot blast furnace air supply signal fault detection and troubleshooting method of the present invention. DETAILED DESCRIPTION

[0017] The following is a detailed description of the preferred implementation of the hot blast stove air supply signal fault detection and troubleshooting method of the present invention in conjunction with the accompanying drawings: like Figure 1 As shown, a hot blast stove air supply signal fault detection and troubleshooting method is applied to a hot blast stove system that provides hot air for a blast furnace, and includes the following steps: S1 hot blast furnace system hot blast furnace 2 on the cold air duct 21 is provided with a cold air pressure measuring point 212, the cold air pressure measuring point 212 real-time monitoring of the cold air duct pressure 21, real-time monitoring of the cold air duct pressure 21 is N1; A hot air pressure measuring point 222 is provided on the hot air pipe 22 in the hot air furnace 2, and the hot air pressure measuring point 222 monitors the pressure of the hot air pipe 22 in real time, and monitors the pressure N2 of the hot air pipe 22 in real time; The absolute value of the pressure difference between N1 and N2 is |N1-N2|; S2. Set parameter M1, M1 is a non-negative number; S3. When the original hot air furnace 2 is switched from the air supply state to the combustion heat storage state, the hot air furnace control system obtains the air supply signal of the cold air valve 211 and the hot air valve 221 of the original combustion hot air furnace 2, and according to the real-time monitoring | N1-N2 |, the hot air furnace control system detects whether the air supply signal of the cold air valve 211 and the hot air valve 221 of the original combustion hot air furnace 2 is faulty: If | N1-N2 | is greater than the parameter M1, the hot blast stove control system determines that the air supply signal failure of the cold air valve 211 and the hot air valve 221 of the hot blast stove 2 originally burning is in full open position. At this time, the hot blast stove control system controls the hot air valve 221 and the cold air valve 211 of the hot blast stove 2 originally supplying air, so that the hot air valve 221 and the cold air valve 211 of the hot blast stove 2 originally supplying air stop closing action; at the same time, the hot blast stove control system controls to send out an alarm signal. After receiving the alarm signal, the operator manually opens the hot air valve 221 and the cold air valve 211 of the hot blast stove 2 originally supplying air to eliminate the failure of the air supply signal.

[0018] The hot blast furnace air supply signal fault detection and troubleshooting method of the present invention is applied to a hot blast furnace system that provides hot blast for a blast furnace 1, wherein the hot blast furnace system comprises a blast furnace blower 3, two or more hot blast furnaces 2, and a hot blast furnace control system, wherein the hot blast furnace 2 has a cold blast end and a hot blast end, and the cold blast end of the hot blast furnace 2 is provided with a cold blast pipe 21 and a pressure equalizing pipe 20, and the cold blast pipe 21 and the pressure equalizing pipe 20 are connected in parallel between the cold blast end of the hot blast furnace 2 and the blast furnace blower 3, a cold blast valve 211 is installed on the cold blast pipe 21, and a pressure equalizing valve 201 is installed on the pressure equalizing pipe 20, and the hot blast end of the hot blast furnace 2 is connected with the blast furnace 1 through a hot blast pipe 22, and a hot blast valve 221 is installed on the hot blast pipe 22; In the hot blast stove system, the hot blast stove control system controls the two or more hot blast stoves 2 to alternately switch working states, and take turns to provide hot blast to the blast furnace 1. The switching process of the working state of the hot blast stove 2 is: J1. After the temperature of the original combustion hot blast furnace 2 reaches the air supply temperature after combustion, the hot blast furnace control system controls the original combustion hot blast furnace 2 in the pressure equalizing pipe 20 on the pressure equalizing valve 201 to open, under the power of the blast furnace blower 3, to the original combustion hot blast furnace 2 pressurized; J2. After the pressures at the cold air end and the hot air end of the original burning hot blast furnace 2 are balanced, the hot blast furnace control system controls the opening of the cold air valve 211 and the hot air valve 221 of the original burning hot blast furnace 2, and switches the original burning hot blast furnace 2 from the combustion heat storage state to the air supply state. At the same time, the hot blast furnace control system obtains the air supply signal that the cold air valve 211 and the hot air valve 221 of the original burning hot blast furnace 2 are fully opened; J3. After the hot blast furnace control system obtains the air supply signal that the cold air valve 211 and the hot air valve 221 of the original burning hot blast furnace 2 are fully opened, the hot blast furnace control system controls the hot air valve 221 and the cold air valve 211 of the original air supplying hot blast furnace 2 to be closed in sequence, and switches the original air supplying hot blast furnace 2 from the air supply state to the combustion heat storage state.

[0019] Under the switching process of the working state of the hot blast furnace 2, the hot blast furnace air supply signal fault detection and troubleshooting method of the present invention, in step S3, when the hot blast furnace 2 that originally supplies air switches from the air supply state to the combustion heat storage state, it is the above-mentioned step J3. That is to say, based on the above-mentioned switching process of the working state of the hot blast furnace 2, the step S3 of the hot blast furnace air supply signal fault detection and troubleshooting method of the present invention is that in step J3, after the hot blast furnace control system obtains the air supply signal that the cold air valve 211 and the hot air valve 221 of the original burning hot blast furnace 2 are opened in place, according to the real-time monitoring obtained | N1-N2 |, the hot blast furnace control system detects whether the air supply signal that the cold air valve 211 and the hot air valve 221 of the original burning hot blast furnace 2 are opened in place is faulty: if | N1-N2| is greater than the parameter M1, the hot blast stove control system determines that the cold air valve 211 and the hot air valve 221 of the original burning hot blast stove 2 are in full open position. At this time, the hot blast stove control system controls the hot air valve 221 and the cold air valve 211 of the original hot blast stove 2 to stop the closing action of the hot air valve 221 and the cold air valve 211 of the original hot blast stove 2; at the same time, the hot blast stove control system sends an alarm signal. After receiving the alarm signal, the operator manually opens the hot air valve 221 and the cold air valve 211 of the original hot blast stove 2 to eliminate the fault of the air supply signal.

[0020] The method for detecting and troubleshooting faults of air supply signals of hot blast stoves of the present invention is provided with the cold air pressure measuring point 212 on the cold air pipe 21 of the hot blast stove 2 to monitor the pressure of the cold air pipe 21 in real time, and the hot air pressure measuring point 222 is provided on the hot air pipe 22 of the hot blast stove 2 to monitor the pressure N2 of the hot air pipe 22 in real time, so that in the switching process of the working state of the hot blast stove 2, after obtaining the air supply signals of the cold air valve 211 and the hot air valve 221 of the hot blast stove 2 originally burning to be opened in place, the pressure condition in the hot blast stove 2 can be judged according to the |N1-N2| obtained by real-time monitoring, and then it can be judged whether the cold air valve 211 and the hot air valve 221 of the hot blast stove 2 are opened in place normally, and it is detected whether the air supply signals of the cold air valve 211 and the hot air valve 221 of the hot blast stove 2 originally burning to be opened in place are faulty. And when |N1-N2| is greater than parameter M1, it is judged that the air supply signal failure of the cold air valve 211 and the hot air valve 221 of the hot blast furnace 2 originally burning is fully opened, and the closing action of the hot air valve 221 and the cold air valve 211 of the hot blast furnace 2 originally supplying air is stopped immediately to prevent the hot air valve 221 and the cold air valve 211 of the hot blast furnace 2 from being completely closed, which leads to the increase of pressure in the hot blast furnace 2. At the same time, the hot blast furnace system has an alarm function, through the prompt of the alarm signal, so that the operator can manually open the hot air valve 221 and the cold air valve 211 of the hot blast furnace 2 originally supplying air, so as to completely eliminate the failure of the air supply signal, and avoid the occurrence of safety accidents such as slag filling at the tuyere of blast furnace 1, pressure holding of hot blast furnace 2, and surge of blast furnace blower 3.

[0021] In the hot blast furnace air supply signal fault detection and troubleshooting method of the present invention, preferably, parameter M1 is not greater than 9Kpa. The setting value of parameter M1 is directly related to the sensitivity of air supply signal fault detection. The larger the value of parameter M1, the lower the detection sensitivity; the smaller the value of parameter M1, the higher the detection sensitivity.

[0022] In the hot blast furnace air supply signal fault detection and troubleshooting method of the present invention, preferably, the parameter M1 is any value between 5 Kpa and 8 Kpa. The smaller the value of the parameter M1, the higher the detection sensitivity, but at a higher sensitivity, the hot blast pipe 22 and the normal fluctuation of the pressure of the hot blast pipe 22 are also easily regarded as faults. To eliminate this situation, preferably, the parameter M1 is any value between 5 Kpa and 8 Kpa.

[0023] In the hot blast stove air supply signal fault detection and troubleshooting method of the present invention, preferably, the blast furnace blower 3 and the blast furnace 1 in the hot blast stove system are further connected with a mixed air pipe 23, and a mixed air regulating valve 231 is installed on the mixed air pipe 23. After the blast furnace blower 3 and the blast furnace 1 are directly connected through the mixed air pipe 23, when the air supply signal fails and the hot blast stove 2 is under high pressure, if the cold air valve 211 of the hot blast stove 2 is normally opened, and the hot air valve 221 of the hot blast stove 2 fails and is not fully opened, resulting in high pressure in the hot blast stove 2, the mixed air regulating valve 231 can be opened, so that the cold air of the blast furnace blower 3 can directly enter the blast furnace 1 through the mixed air pipe 23, instead of entering the hot blast stove 2, thereby avoiding the risk of explosion caused by excessive pressure in the hot blast stove 2 and reducing the accident level caused by the air supply signal failure.

[0024] The hot blast furnace air supply signal fault detection and troubleshooting method of the present invention, preferably, the hot blast furnace air supply signal fault detection and troubleshooting method also includes step S4, step S4 is: setting parameter M2, M2 is a non-negative number; if N1 is greater than parameter M2, the hot blast furnace control system controls the mixed air regulating valve 231 to open. After real-time monitoring of the pressure of the cold air pipe 21, the real-time monitored pressure of the cold air pipe 21 is compared with the set parameter M2. When N1 is greater than parameter M2, the mixed air regulating valve 231 is controlled to open automatically, so as to realize the interlocking of the pressure of the cold air pipe 21 and the mixed air regulating valve 231, and eliminate the risk of pressure holding in the hot blast furnace 2.

[0025] The hot blast stove air supply signal fault detection and troubleshooting method of the present invention monitors the pressure of the cold blast pipe 21 and the pressure of the hot blast pipe 22 in real time, and step S3 makes a primary response and step S4 makes a secondary response. The abnormal conditions of the hot blast stove 2 are comprehensively, step by step and efficiently monitored and responded to, which can effectively prevent the occurrence of blast furnace air supply failure accidents due to false signals of the hot blast stove 2 or artificial misclosing of the hot blast valve 221 and the cold blast valve 211.

[0026] In the hot blast furnace air supply signal fault detection and troubleshooting method of the present invention, preferably, the parameter M2 is any value between 410Kpa and 450Kpa. Considering the pressure of the cold air pipe 21 under normal operation and the pressure of the cold air pipe 21 when the hot blast furnace 2 is under pressure, combined with the actual situation, preferably, the parameter M2 is any value between 410Kpa and 450Kpa.

[0027] In the hot blast stove air supply signal fault detection and troubleshooting method of the present invention, the cold air pressure measuring point 212 is a pressure sensor installed on the cold air pipe 21 of the hot blast stove 2. The hot air pressure measuring point 222 is a pressure sensor installed on the hot air pipe 22 of the hot blast stove 2.

[0028] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A hot blast stove air supply signal fault detection and troubleshooting method, applied to a hot blast stove system providing hot air for a blast furnace, Features: The following steps are involved: S1 hot blast furnace system hot blast furnace cold air duct set cold air pressure measuring point, the cold air pressure measuring point real-time monitoring of the cold air duct pressure, real-time monitoring of the cold air duct pressure is N1; A hot air pressure measuring point is arranged on the hot air pipe of the hot air furnace in the hot air furnace system, and the hot air pressure measuring point monitors the pressure of the hot air pipe in real time, and the pressure N2 of the hot air pipe is monitored in real time; The absolute value of the pressure difference between N1 and N2 is |N1-N2|; S2. Set parameter M1, M1 is a non-negative number; S3. When the original hot air furnace with air supply switches from the air supply state to the combustion heat storage state, the hot air furnace control system obtains the air supply signal of the cold air valve and the hot air valve of the original combustion hot air furnace, and then detects whether the air supply signal of the cold air valve and the hot air valve of the original combustion hot air furnace is faulty according to | N1-N2 | obtained by real-time monitoring: If | N1-N2 | is greater than parameter M1, the hot blast stove control system determines that the air supply signal failure of the cold air valve and the hot air valve of the original burning hot blast stove is in full open position. At this time, the hot blast stove control system controls the hot air valve and the cold air valve of the original hot blast stove to stop closing the hot air valve and the cold air valve of the original hot blast stove; at the same time, the hot blast stove control system controls to send out an alarm signal. After receiving the alarm signal, the operator manually opens the hot air valve and the cold air valve of the original hot blast stove to eliminate the failure of the air supply signal.

2. The hot blast stove air supply signal fault detection and troubleshooting method according to claim 1, Features: Parameter M1 is not greater than 9Kpa.

3. The hot blast stove air supply signal fault detection and troubleshooting method according to claim 2, Features: Parameter M1 is any value between 5 Kpa ~8 Kpa.

4. The hot blast stove air supply signal fault detection and troubleshooting method according to claim 1, Features: The blast furnace blower and the blast furnace are also connected with an air mixing pipe, and an air mixing regulating valve is installed on the air mixing pipe.

5. The method for detecting and troubleshooting the fault of the hot blast stove air supply signal according to claim 4, Features: The hot blast stove air supply signal fault detection and troubleshooting method also includes step S4, which is: setting parameter M2, where M2 is a non-negative number; if N1 is greater than parameter M2, the hot blast stove control system controls the mixed air regulating valve to open.

6. The method for detecting and troubleshooting a hot blast stove air supply signal fault according to claim 5, Features: Parameter M2 is any value between 410Kpa and 450Kpa.

7. The hot blast stove air supply signal fault detection and troubleshooting method according to claim 1, Features: The cold air pressure measuring point is a pressure sensor installed on the cold air pipe of the hot air stove.

8. The method for detecting and troubleshooting a hot blast stove air supply signal fault according to claim 1, Features: The hot air pressure measuring point is a pressure sensor installed on the hot air pipe of the hot air furnace.

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