Blast furnace top equipment temperature interlocking control system and method

Abstract

The invention provides a blast furnace top equipment temperature interlocking control system and method, and relates to the technical field of blast furnace ironmaking equipment temperature control. The system comprises a control module, a first temperature detector arranged in the lower valve box, a second temperature detector arranged in the airtight box, a first nitrogen branch pipe and a second nitrogen branch pipe. A first flow control valve and a first flow meter are mounted on the first nitrogen branch pipe, and a second flow control valve and a second flow meter are mounted on the second nitrogen branch pipe; the first nitrogen branch pipe is communicated with the lower valve box and a nitrogen main pipe of the blast furnace, the second nitrogen branch pipe is connected with the airtight box and the nitrogen main pipe, nitrogen for cooling is introduced into the nitrogen main pipe, and a nitrogen control main valve and a nitrogen main flow meter are mounted on the nitrogen main pipe. Stable control over the temperature of the blast furnace top equipment can be achieved, meanwhile, nitrogen consumption is greatly reduced, and the automation level and economic benefits of blast furnace production are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control of blast furnace ironmaking equipment, and particularly relates to a blast furnace top equipment temperature interlocking control system and method. BACKGROUND

[0002] In the blast furnace ironmaking production process, the blast furnace top equipment, especially the gas-tight box and the lower valve box, is in a high-temperature environment for a long time, and its normal operation is crucial to the entire blast furnace production. At present, the normal working temperature of the blast furnace top equipment is mainly maintained by nitrogen cooling, for example, the temperature of the gas-tight box is controlled at 50-60℃, and the temperature of the lower valve box is controlled at 140-150℃. However, the blast furnace top equipment is always in a state of constant change due to various factors such as blast furnace internal airflow, furnace charge, etc., and at the same time, the nitrogen pressure will also change due to factors such as gas source fluctuation, thereby causing unstable nitrogen flow. In addition, seasonal changes in weather temperature also affect the temperature control of the blast furnace top equipment.

[0003] Under the existing manual adjustment of nitrogen valve opening degree, there are many problems. When the top temperature drops or the nitrogen pressure rises, if the valve opening degree cannot be reduced in time, excessive cooling will occur, which will cause the temperature of the blast furnace top equipment to be much lower than the set value, sometimes even lower than 30℃, resulting in a large amount of nitrogen waste; and when the blast furnace top gas temperature is too high or the nitrogen pressure is too low, if the nitrogen flow is not increased in time, the temperature of the blast furnace top equipment will exceed the control value, seriously affecting the normal service life and operation stability of the equipment. Moreover, manual adjustment is limited by human energy and cannot respond to temperature changes in a timely, accurate and efficient manner, making it difficult to ensure that the temperature of the blast furnace top equipment is always within a stable control range. These problems not only increase the production cost, but also pose a potential threat to the continuous and stable production of the blast furnace. SUMMARY

[0004] The present application aims to provide a blast furnace top equipment temperature interlocking control system and method, which can solve the problems of low efficiency, nitrogen waste and inaccurate temperature control in the existing manual adjustment of valve opening degree, and can realize stable control of the temperature of the blast furnace top equipment, while greatly saving nitrogen consumption and improving the automation level and economic benefits of blast furnace production.

[0005] In order to achieve the above object, the first aspect of the present application provides a blast furnace top equipment temperature interlocking control system, comprising a control module, a first temperature detector arranged in a lower valve box, a second temperature detector arranged in a gas-tight box, a first nitrogen branch pipe and a second nitrogen branch pipe; a first flow control valve and a first flow meter are arranged on the first nitrogen branch pipe, and a second flow control valve and a second flow meter are arranged on the second nitrogen branch pipe; the first nitrogen branch pipe is connected with a nitrogen main pipe of the blast furnace and the lower valve box, the second nitrogen branch pipe is connected with the nitrogen main pipe and the gas-tight box, the nitrogen main pipe is connected with a nitrogen cooling device, and a nitrogen control main valve and a nitrogen total flow meter are arranged on the nitrogen main pipe. The nitrogen control main valve, the nitrogen total flow meter, the first flow control valve, the first flow meter, the second flow control valve, the second flow meter, the first temperature detector and the second temperature detector are connected with the control module. According to the blast furnace top equipment temperature interlocking control system provided by the present application, a pre-warning module is further provided, and the pre-warning module is connected with the control module. The second aspect of the present application provides a blast furnace top equipment temperature interlocking control method, which adopts the blast furnace top equipment temperature interlocking control system of the first aspect, and the method comprises the following steps. Step 1: the first temperature detector detects the internal temperature t1 of the lower valve box in real time, the second temperature detector detects the internal temperature t2 of the gas-tight box in real time, the first flow meter detects the flow of the cooling nitrogen in the first nitrogen branch pipe in real time, the second flow meter detects the flow of the cooling nitrogen in the second nitrogen branch pipe in real time, and the nitrogen total flow meter detects the flow of the cooling nitrogen in the nitrogen main pipe in real time. Step 2: when the internal temperature t1 of the lower valve box or the internal temperature t2 of the gas-tight box is not in the corresponding working temperature range T1 or T2, the control module controls the opening degree adjustment of the nitrogen control main valve, the first flow control valve and the second flow control valve according to the flow of the cooling nitrogen in the first nitrogen branch pipe, the flow of the cooling nitrogen in the second nitrogen branch pipe and the flow of the cooling nitrogen in the nitrogen main pipe.

[0006] According to the blast furnace top equipment temperature interlocking control method provided by the present application, step 2 specifically comprises the following steps. When t2 is less than the lower limit of the working temperature range T2, the control module controls the second flow control valve to decrease the opening degree according to a preset partial adjustment amplitude, until the flow of the cooling nitrogen in the second nitrogen branch pipe detected by the second flow meter is decreased by a preset flow range, and after a preset time delay, if t2 rises, the current opening degree of the second flow control valve is maintained, and if t2 falls, the second flow control valve continues to decrease the opening degree according to the preset partial adjustment amplitude until t2 rises after a preset time delay. When t2 is greater than the upper limit of the working temperature range T2, the control module controls the second flow control valve to increase the opening degree by a preset partial adjustment amplitude until the flow of the cooling nitrogen in the second nitrogen branch pipe increases by a preset flow range is detected by the second flow meter, and after a preset time delay, if t2 decreases, the current opening degree of the second flow control valve is maintained, and if t2 increases, the second flow control valve continues to increase the opening degree by the preset partial adjustment amplitude until t2 decreases after the preset time delay.

[0007] According to the blast furnace top equipment temperature interlocking control method provided by the application, step 2 further specifically comprises: When t2 is less than the lower limit of the working temperature range T2 and the opening degree of the second flow control valve is reduced to the lower limit of the opening degree, the control module controls the nitrogen control total valve to reduce the opening degree by a preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen total pipe is reduced by a preset flow range is detected by the nitrogen total flow meter, and after a preset time delay, if t2 increases, the current opening degrees of the second flow control valve and the nitrogen control total valve are maintained, and if t2 decreases, the nitrogen control total valve continues to reduce the opening degree by the preset total adjustment amplitude until t2 increases after the preset time delay. When t2 is greater than the upper limit of the working temperature range T2 and the opening degree of the second flow control valve is increased to the upper limit of the opening degree, the control module controls the nitrogen control total valve to increase the opening degree by a preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen total pipe is increased by a preset flow range is detected by the nitrogen total flow meter, and after a preset time delay, if t2 decreases, the current opening degrees of the second flow control valve and the nitrogen control total valve are maintained, and if t2 increases, the nitrogen control total valve continues to increase the opening degree by the preset total adjustment amplitude until t2 decreases after the preset time delay.

[0008] According to the blast furnace top equipment temperature interlocking control method provided by the application, step 2 further specifically comprises: When t2 is less than the lower limit of the working temperature range T2 and the opening degrees of the second flow control valve and the nitrogen control total valve are both reduced to the lower limit of the opening degree, the control module controls the pre-warning module to perform sound and light alarm.

[0009] According to the blast furnace top equipment temperature interlocking control method provided by the application, step 2 specifically comprises: When t1 is less than the lower limit of the working temperature range T1, the control module controls the first flow control valve to reduce the opening degree by a preset partial adjustment amplitude until the flow of the cooling nitrogen in the first nitrogen branch pipe is reduced by a preset flow range is detected by the first flow meter, and after a preset time delay, if t1 increases, the current opening degree of the first flow control valve is maintained, and if t1 decreases, the first flow control valve continues to reduce the opening degree by the preset partial adjustment amplitude until t1 increases after the preset time delay. When t1 is greater than the upper limit of the working temperature range T1, the control module controls the first flow control valve to increase the opening degree by a preset partial adjustment amplitude until the flow of the cooling nitrogen in the first nitrogen branch pipe increases by a preset flow range detected by the first flow meter, and after a preset time delay, if t1 decreases, the current opening degree of the first flow control valve is maintained, and if t1 increases, the first flow control valve continues to increase the opening degree by the preset partial adjustment amplitude until t1 decreases after the preset time delay.

[0010] According to the blast furnace top equipment temperature interlocking control method provided by the application, step 2 further specifically comprises: When t1 is less than the lower limit of the working temperature range T1 and the opening degree of the first flow control valve is reduced to the lower limit of the opening degree, the control module controls the nitrogen control total valve to reduce the opening degree by a preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen total pipe is reduced by a preset flow range detected by the nitrogen total flow meter, and after a preset time delay, if t1 increases, the current opening degrees of the first flow control valve and the nitrogen control total valve are maintained, and if t1 decreases, the nitrogen control total valve continues to reduce the opening degree by the preset total adjustment amplitude until t1 increases after the preset time delay. When t1 is greater than the upper limit of the working temperature range T1 and the opening degree of the first flow control valve is increased to the upper limit of the opening degree, the control module controls the nitrogen control total valve to increase the opening degree by a preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen total pipe is increased by a preset flow range detected by the nitrogen total flow meter, and after a preset time delay, if t1 decreases, the current opening degrees of the first flow control valve and the nitrogen control total valve are maintained, and if t1 increases, the nitrogen control total valve continues to increase the opening degree by the preset total adjustment amplitude until t1 decreases after the preset time delay.

[0011] According to the blast furnace top equipment temperature interlocking control method provided by the application, step 2 further specifically comprises: When t1 is less than the lower limit of the working temperature range T1 and the opening degrees of the first flow control valve and the nitrogen control total valve are both reduced to the lower limit of the opening degree, the control module controls the early warning module to perform sound and light alarm.

[0012] According to the blast furnace top equipment temperature interlocking control method provided by the application, the working temperature range T1 is 140℃≤T1≤150℃, the working temperature range T2 is 50℃≤T2≤60℃, the adjustable range of the opening degree is 40%-100%, the preset partial adjustment amplitude is 3% / time, the preset total adjustment amplitude is 1% / time, and the preset flow range is 100m 3 / h -200m 3 / h.

[0013] Compared with the prior art, the application at least has the following technical effects: 1. Temperature stability. Through interlocking control, the system can automatically adjust the nitrogen flow according to the real-time changes in the temperature of the furnace top equipment, making the temperature of the furnace top equipment more stable, effectively reducing the damage to the equipment caused by temperature fluctuations, and prolonging the service life of the equipment.

[0014] 2. Save nitrogen. Precise flow control avoids excessive cooling and waste of nitrogen, greatly saving nitrogen consumption and reducing production costs.

[0015] 3. Improve efficiency. Automation control replaces manual adjustment, eliminating the tedious work of frequent manual adjustment of nitrogen valves, saving labor costs, while improving the timeliness and accuracy of temperature control, and improving the overall efficiency of blast furnace production. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0017] In the drawings: Figure 1 The structure diagram of the blast furnace top equipment temperature interlocking control system of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the present application will be described clearly and completely in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0019] Some embodiments of the present application will be described in detail below in combination with the drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] Please refer to Figure 1The embodiment of the present application provides a blast furnace top equipment temperature interlocking control system, the blast furnace top equipment comprises a lower valve box and a gas-tight box, the system comprises a control module, a first temperature detector 3 arranged in the lower valve box 1, a second temperature detector 4 arranged in the gas-tight box 2, a first nitrogen branch pipe 12 and a second nitrogen branch pipe 13, a first flow control valve 7 and a first flow meter 8 are arranged on the first nitrogen branch pipe 12, a second flow control valve 9 and a second flow meter 10 are arranged on the second nitrogen branch pipe 13, the first nitrogen branch pipe 12 is connected with a nitrogen main pipe 11 of the blast furnace and the lower valve box 1, the second nitrogen branch pipe 13 is connected with the nitrogen main pipe 11 and the gas-tight box 2, the nitrogen main pipe 11 is connected with nitrogen for cooling, and a nitrogen control master valve 5 and a nitrogen total flow meter 6 are arranged on the nitrogen main pipe 11. The nitrogen control master valve 5, the nitrogen total flow meter 6, the first flow control valve 7, the first flow meter 8, the second flow control valve 9, the second flow meter 10, the first temperature detector 3 and the second temperature detector 4 are connected with the control module.

[0021] Further, the system further comprises a pre-warning module, and the pre-warning module is connected with the control module.

[0022] It should be noted that the first temperature detector 1 and the second temperature detector 2 of the present application respectively collect the temperature data of the lower valve box 1 and the gas-tight box 2 of the blast furnace top in real time, serve as a data acquisition module, can accurately obtain the actual temperature value of the equipment, and transmit the actual temperature value to the subsequent control module for processing and analysis.

[0023] The nitrogen control master valve 5, the first flow control valve 7 and the second flow control valve 9 can accurately adjust the valve opening degree according to the control signal sent by the control module, so as to realize accurate control of the nitrogen flow.

[0024] The control module compares and analyzes the preset control temperature range and the collected actual temperature, when the actual temperature is within the control range, the corresponding electric valve opening degree remains unchanged, if the compared actual temperature is not within the control range (a downward trend or an upward trend), the control module sends corresponding control signals to increase or decrease the electric valve opening degree, so as to ensure that the temperature of the blast furnace top equipment always maintains in the set control range. It is convenient for equipment managers to flexibly adjust the equipment operating temperature according to the actual operating state of the equipment, production process requirements and the like.

[0025] When the nitrogen total valve opening degree reaches full opening or is in a preset minimum opening state, the system continuously monitors the temperature of the blast furnace top equipment. If the temperature still does not reach the expected range at this time, the control pre-warning module is immediately started, is transmitted to a monitoring terminal of a central control room, and sends an alarm to an operator through an audible and visual alarm device, so that the cause is investigated and measures are taken in time.

[0026] Another embodiment of the present application provides a blast furnace top equipment temperature interlocking control method, which adopts the blast furnace top equipment temperature interlocking control system of the foregoing embodiment, and the method comprises the following steps: Step 1, the first temperature detector 3 detects the internal temperature t1 of the lower valve box 1 in real time, the second temperature detector 4 detects the internal temperature t2 of the airtight box 2 in real time, the first flowmeter 8 detects the flow of the cooling nitrogen in the first nitrogen branch pipe 12 in real time, the second flowmeter 10 detects the flow of the cooling nitrogen in the second nitrogen branch pipe 13 in real time, and the nitrogen total flowmeter 6 detects the flow of the cooling nitrogen in the nitrogen main pipe 11 in real time. Step 2, when the internal temperature t1 of the lower valve box 1 or the internal temperature t2 of the airtight box 2 is not within the corresponding working temperature range T1 or T2, the control module controls the opening degree adjustment of the nitrogen control total valve 5, the first flow control valve 7 and the second flow control valve 9 according to the flow of the cooling nitrogen in the first nitrogen branch pipe 12, the flow of the cooling nitrogen in the second nitrogen branch pipe 13 and the flow of the cooling nitrogen in the nitrogen main pipe 11.

[0027] The nitrogen main pipe 11 of the blast furnace is connected to the nitrogen for cooling, the nitrogen control total valve 5 and the nitrogen total flowmeter 6 are installed on the nitrogen main pipe 11, the nitrogen main pipe 11 is connected to two branch pipes, i.e., the first nitrogen branch pipe 12 and the second nitrogen branch pipe 13, the first flow control valve 7 and the first flowmeter 8 are installed on the first nitrogen branch pipe 12, the second flow control valve 9 and the second flowmeter 10 are installed on the second nitrogen branch pipe 13, the first temperature detector 3 is arranged in the lower valve box 1, and the second temperature detector 4 is arranged in the airtight box 2. The nitrogen control total valve 5, the nitrogen total flowmeter 6, the first flow control valve 7, the first flowmeter 8, the second flow control valve 9, the second flowmeter 10, the first temperature detector 3 and the second temperature detector 4 are electrically connected to the control module, so that the control module can send control signals and accurately perform corresponding actions.

[0028] The nitrogen control total valve 5, the first flow control valve 7 and the second flow control valve 9 can be electric valves, the control module is preset with an initial control temperature value, and parameters such as temperature comparison deviation range and electric valve opening degree adjustment rule are set, so as to complete the system temperature adjustment work.

[0029] Specifically, the working temperature range of the lower valve box 1 is T1 = 140-150°C (lower limit B1 = 140°C, upper limit B2 = 150°C), and the working temperature range of the airtight box 2 is T2 = 50-60°C (lower limit A1 = 50°C, upper limit A2 = 60°C). To prevent the valve opening from being too small during the adjustment process, a certain safety opening needs to be reserved, and the adjustable range of the valve opening of the nitrogen control master valve 5, the first flow control valve 7 and the second flow control valve 9 is set to 40-100%. During the actual adjustment process, the first flow control valve 7 and the second flow control valve 9 are preferentially adjusted according to the temperature condition, and if the opening of the first flow control valve 7 or the second flow control valve 9 reaches the set upper limit or lower limit, the opening of the nitrogen control master valve 5 is adjusted.

[0030] In some embodiments, the first temperature detector 3 and the second temperature detector 4 can be thermocouples, which respectively collect the internal temperatures t1 and t2 of the lower valve box 1 and the airtight box 2 in real time. According to the current opening x0 of the nitrogen control master valve 5, the opening x1 of the first flow control valve 7 and the opening x2 of the second flow control valve 9 (the adjustment range of the first flow control valve 7 and the second flow control valve 9 is 3% / time, and the adjustment range of the nitrogen control master valve 5 is 1% / time), when t1 or t2 is not within the corresponding working temperature range T1 or T2, the opening adjustment of the nitrogen control master valve, the first flow control valve 7 and the second flow control valve 9 is delayed for a preset time, for example, the control program is triggered after a delay of 5 seconds, and the opening adjustment is performed.

[0031] The control process for the internal temperature t2 of the airtight box 2 is as follows: When 50°C≤t2≤60°C, the second flow control valve 9 does not adjust the opening, and the cooling nitrogen flow does not need to be increased.

[0032] When t2<50°C, the control module controls the second flow control valve 9 to decrease the opening x2 according to the preset sub-adjustment range, until the cooling nitrogen flow in the second nitrogen branch pipe 13 is detected by the second flowmeter 10 to decrease by a preset flow range. If the opening x2 is decreased to the lower limit of 40%, the nitrogen control master valve 5 is controlled to decrease the opening x0 according to the preset total adjustment range, until the cooling nitrogen flow in the nitrogen main pipe 11 is detected by the nitrogen total flowmeter 6 to decrease by a preset flow range. After a delay of a preset time (for example, 5 seconds), it is judged whether t2 rises. If t2 rises, the current opening of the second flow control valve 9 is maintained. If t2 falls, x2 or x0 continues to decrease until t2 rises after a delay of 5 seconds. If the opening x0 of the nitrogen control master valve 5 is decreased to the lower limit of 40%, the control warning module performs audible and light alarms, for example, the audible and light alarm program is triggered, to remind the operator that the internal temperature of the airtight box 2 is too low, and the cooling nitrogen flow has been adjusted to the limit.

[0033] When t2> 60℃, the control module controls the second flow control valve 9 to increase the opening x2 by the preset partial adjustment amplitude until the flow of the cooling nitrogen in the second nitrogen branch pipe 13 increases by the preset flow range detected by the second flow meter 10, (if the opening x2 increases to the upper limit 100%, the nitrogen control total valve 5 is controlled to increase the opening x0 by the preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen total pipe 11 increases by the preset flow range detected by the nitrogen total flow meter 6), and it is judged whether t2 decreases after a delay of 5s, if t2 decreases, the current opening of the second flow control valve 9 is maintained, if t2 increases, x2 or x0 continues to increase until t2 decreases after a delay of 5s. If the opening x0 of the nitrogen control total valve 5 increases to 100%, the control warning module performs sound and light alarm, for example, triggers the sound and light alarm program, reminding the operator that the internal temperature of the gas-tight box 2 is too high, and the cooling nitrogen flow has been adjusted to the limit.

[0034] The control process for the internal temperature t1 of the lower valve box 1 is similar to the control process for the internal temperature t2 of the gas-tight box 2, specifically: When 140℃≤t1≤150℃, the first flow control valve 7 does not adjust the opening; there is no need to increase the flow of the cooling nitrogen.

[0035] When t1< 140℃, the opening x1 of the first flow control valve 7 is reduced (if x1 reaches 40%, the opening x0 of the nitrogen control total valve 5 is reduced), thereby reducing the flow of the cooling nitrogen by 100-200m 3 / h, it is judged whether t1 increases after a delay of 5s, if t1 increases, the current opening of the first flow control valve 7 is maintained, if t1 decreases, x1 or x0 continues to decrease until t1 increases after a delay of 5s. If the opening x0 of the nitrogen control total valve 5 decreases to 40%, an alarm is performed, for example, the sound and light alarm program is triggered, reminding the operator that the internal temperature of the lower valve box 1 is too low, and the cooling nitrogen flow has been adjusted to the limit.

[0036] When t1> 150℃, the opening x1 of the first flow control valve 7 is increased (if x1 reaches 100%, the opening x0 of the nitrogen control total valve 5 is increased), thereby increasing the flow of the cooling nitrogen by 100-200m 3 / h, it is judged whether t1 decreases after a delay of 5s, if t1 decreases, the current opening of the first flow control valve 7 is maintained, if t1 increases, x1 or x0 continues to increase until t1 decreases after a delay of 5s. If the opening x0 of the nitrogen control total valve 5 increases to 100%, an alarm is performed, for example, the sound and light alarm program is triggered, reminding the operator that the internal temperature of the lower valve box 1 is too high, and the cooling nitrogen flow has been adjusted to the limit.

[0037] In this embodiment, the adjustable range of the opening is 40%-100%, the preset partial adjustment amplitude is 3% / time, the preset total adjustment amplitude is 1% / time, and the preset flow range is 100m3 / h -200m 3 / h.

[0038] In some embodiments, the application can be handled in an emergency: once the automatic control process of the valve fails or the system is abnormal, the electric valve cannot work normally, the operator can quickly switch to manual control of the valve, manually adjust the valve opening according to the temperature of the equipment, maintain the cooling of the blast furnace top equipment, and ensure the production of the blast furnace is not affected. At the same time, the automatic control components are repaired or replaced in time, and after the fault is eliminated, the automatic control mode of the application is switched back.

[0039] The system of the application can reduce the nitrogen flow consumption by 1 million m 3 , and can save the nitrogen cost of 280,000 yuan / month, which has considerable economic benefits.

[0040] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the application cover any and all variations of the application that come within the scope of the general inventive concepts and including such modifications not only in the general principles but also in the application, details, and designs thereof. It is to be understood that the application is not to be limited to the exact details shown and described herein, and that many variations and modifications can be made thereto without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A blast furnace top equipment temperature interlock control system, the blast furnace top equipment comprising a lower valve chest and a gas-tight box, characterized by, The system comprises a control module, a first temperature detector arranged in the lower valve box, a second temperature detector arranged in the airtight box, a first nitrogen branch pipe and a second nitrogen branch pipe; the first nitrogen branch pipe is provided with a first flow control valve and a first flow meter, and the second nitrogen branch pipe is provided with a second flow control valve and a second flow meter; the first nitrogen branch pipe is connected with the nitrogen main pipe of the blast furnace and the lower valve box, the second nitrogen branch pipe is connected with the airtight box and the nitrogen main pipe, the nitrogen main pipe is provided with nitrogen for cooling, and the nitrogen main pipe is provided with a nitrogen control main valve and a nitrogen total flow meter; The nitrogen control main valve, the nitrogen total flow meter, the first flow control valve, the first flow meter, the second flow control valve, the second flow meter, the first temperature detector and the second temperature detector are connected with the control module.

2. The blast furnace top equipment temperature interlock control system of claim 1, wherein, The system further comprises a warning module connected with the control module.

3. A temperature interlocking control method for a blast furnace top equipment, characterized by, The blast furnace top equipment temperature interlocking control system comprises a control module, a first temperature detector arranged in the lower valve box, a second temperature detector arranged in the airtight box, a first nitrogen branch pipe and a second nitrogen branch pipe; the first nitrogen branch pipe is provided with a first flow control valve and a first flow meter, and the second nitrogen branch pipe is provided with a second flow control valve and a second flow meter; the first nitrogen branch pipe is connected with the nitrogen main pipe of the blast furnace and the lower valve box, the second nitrogen branch pipe is connected with the airtight box and the nitrogen main pipe, the nitrogen main pipe is provided with nitrogen for cooling, and the nitrogen main pipe is provided with a nitrogen control main valve and a nitrogen total flow meter; The system further comprises a warning module connected with the control module. The method comprises the following steps:

4. The blast furnace top equipment temperature interlock control method according to claim 3, characterized by, Step 1: the first temperature detector detects the temperature t1 in the lower valve box in real time, the second temperature detector detects the temperature t2 in the airtight box in real time, the first flow meter detects the flow of the cooling nitrogen in the first nitrogen branch pipe in real time, the second flow meter detects the flow of the cooling nitrogen in the second nitrogen branch pipe in real time, and the nitrogen total flow meter detects the flow of the cooling nitrogen in the nitrogen main pipe in real time; Step 2: when the temperature t1 in the lower valve box or the temperature t2 in the airtight box is not in the corresponding working temperature range T1 or T2, the control module controls the opening degree adjustment of the nitrogen control main valve, the first flow control valve and the second flow control valve according to the flow of the cooling nitrogen in the first nitrogen branch pipe, the flow of the cooling nitrogen in the second nitrogen branch pipe and the flow of the cooling nitrogen in the nitrogen main pipe. The step 2 specifically comprises:

5. The blast furnace top equipment temperature interlock control method according to claim 4, characterized by, when t2 is less than the lower limit of the working temperature range T2, the control module controls the second flow control valve to decrease the opening degree by a preset partial adjustment amplitude until the flow of the cooling nitrogen in the second nitrogen branch pipe detected by the second flow meter is decreased by a preset flow range, and after a preset time delay, if t2 rises, the current opening degree of the second flow control valve is maintained, and if t2 falls, the second flow control valve continues to decrease the opening degree by the preset partial adjustment amplitude until t2 rises after the preset time delay; when t2 is greater than the upper limit of the working temperature range T2, the control module controls the second flow control valve to increase the opening degree by a preset partial adjustment amplitude until the flow of the cooling nitrogen in the second nitrogen branch pipe detected by the second flow meter is increased by a preset flow range, and after a preset time delay, if t2 falls, the current opening degree of the second flow control valve is maintained, and if t2 rises, the second flow control valve continues to increase the opening degree by the preset partial adjustment amplitude until t2 falls after the preset time delay. The step 2 further specifically comprises: When t2 is less than the lower limit of the working temperature range T2 and the opening of the second flow control valve is reduced to the lower limit of the opening, the control module controls the nitrogen control master valve to reduce the opening by the preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen main pipe is reduced by the preset flow range detected by the nitrogen total flow meter, and after a preset time delay, if t2 rises, the current openings of the second flow control valve and the nitrogen control master valve are maintained, and if t2 falls, the nitrogen control master valve continues to be controlled to reduce the opening by the preset total adjustment amplitude until t2 rises after a preset time delay. When t2 is greater than the upper limit of the working temperature range T2 and the opening of the second flow control valve is increased to the upper limit of the opening, the control module controls the nitrogen control master valve to increase the opening by the preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen main pipe is increased by the preset flow range detected by the nitrogen total flow meter, and after a preset time delay, if t2 falls, the current openings of the second flow control valve and the nitrogen control master valve are maintained, and if t2 rises, the nitrogen control master valve continues to be controlled to increase the opening by the preset total adjustment amplitude until t2 falls after a preset time delay.

6. The blast furnace top equipment temperature interlock control method according to claim 5, characterized by, The step 2 further specifically comprises: When t2 is less than the lower limit of the working temperature range T2 and the openings of the second flow control valve and the nitrogen control master valve are both reduced to the lower limit of the opening, the control module controls the early warning module to perform audible and visual alarm.

7. The blast furnace top equipment temperature interlock control method according to claim 3, characterized by, The step 2 specifically comprises: When t1 is less than the lower limit of the working temperature range T1, the control module controls the first flow control valve to reduce the opening by the preset partial adjustment amplitude until the flow of the cooling nitrogen in the first nitrogen branch pipe is reduced by the preset flow range detected by the first flow meter, and after a preset time delay, if t1 rises, the current opening of the first flow control valve is maintained, and if t1 falls, the first flow control valve continues to be controlled to reduce the opening by the preset partial adjustment amplitude until t1 rises after a preset time delay. When t1 is greater than the upper limit of the working temperature range T1, the control module controls the first flow control valve to increase the opening by the preset partial adjustment amplitude until the flow of the cooling nitrogen in the first nitrogen branch pipe is increased by the preset flow range detected by the first flow meter, and after a preset time delay, if t1 falls, the current opening of the first flow control valve is maintained, and if t1 rises, the first flow control valve continues to be controlled to increase the opening by the preset partial adjustment amplitude until t1 falls after a preset time delay.

8. The blast furnace top equipment temperature interlock control method according to claim 7, characterized by, The step 2 further specifically comprises: When t1 is less than the lower limit of the working temperature range T1 and the opening of the first flow control valve is reduced to the lower limit of the opening, the control module controls the nitrogen control master valve to reduce the opening by the preset total adjustment amplitude until the flow of the cooling nitrogen in the nitrogen main pipe is reduced by the preset flow range detected by the nitrogen total flow meter, and after a preset time delay, if t1 rises, the current openings of the first flow control valve and the nitrogen control master valve are maintained, and if t1 falls, the nitrogen control master valve continues to be controlled to reduce the opening by the preset total adjustment amplitude until t1 rises after a preset time delay. When t1 is greater than the upper limit of the working temperature range T1 and the opening of the first flow control valve is increased to the upper limit of the opening, the control module controls the nitrogen control master valve to increase the opening according to the preset total adjustment range until the flow of the cooling nitrogen in the nitrogen main pipe is detected by the nitrogen total flow meter to increase by the preset flow range, and after a preset time delay, if t1 decreases, the current openings of the first flow control valve and the nitrogen control master valve are maintained, and if t1 increases, the nitrogen control master valve continues to be controlled to increase the opening according to the preset total adjustment range until t1 decreases after a preset time delay.

9. The blast furnace top equipment temperature interlock control method according to claim 8, characterized by, The step 2 further specifically comprises: When t1 is less than the lower limit of the working temperature range T1 and the openings of the first flow control valve and the nitrogen control master valve are both reduced to the lower limit of the opening, the control module controls the early warning module to perform sound and light alarm.

10. The blast furnace top equipment temperature interlock control method according to claim 6 or 9, characterized by, The working temperature range T1 is 140℃≤T1≤150℃, the working temperature range T2 is 50℃≤T2≤60℃, the opening adjustable range is 40%-100%, the preset partial adjustment amplitude is 3% / time, the preset total adjustment amplitude is 1% / time, and the preset flow range is 100m 3 / h -200m 3 / h.

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