Blast furnace top pressure interlocking protection system and protection method

Abstract

The invention discloses a blast furnace top pressure interlocking protection system and protection method, and relates to the technical field of smelting industry. The blast furnace top pressure interlocking protection system comprises a pressure regulating valve group, a pressure sensor and a controller. Wherein the pressure regulating valve group comprises a plurality of regulating valves, the regulating valves are used for being communicated with a blast furnace and a gas pipe network, and the plurality of regulating valves are arranged in parallel and are connected to the blast furnace gas residual pressure turbine power generation device in parallel; the pressure sensor is arranged on an ascending pipe at the top of the blast furnace to detect furnace top air pressure of the blast furnace; and the controller is in signal connection with the pressure regulating valve group and the pressure sensor so as to control the action of the pressure regulating valve group according to the pressure detection result, and the blast furnace top pressure interlocking protection system effectively improves the regulating efficiency of the furnace top pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of smelting industry, and more specifically, to a top pressure interlock protection system for blast furnace. In addition, the present invention also relates to a protection method applicable to the above-mentioned top pressure interlock protection system for blast furnace. Background Art

[0002] Increasing the top pressure of the blast furnace is an effective measure to improve the gas utilization rate, and this measure is widely used in the smelting industry. However, this measure has a relatively high risk. For example, when the furnace condition gets abnormal, equipment fails, or there are human operation errors, etc., it is very likely to cause an abnormal increase in the top pressure of the blast furnace, which not only poses a threat to the gas pipeline network, but also seriously affects the smooth operation of the blast furnace and the personal safety of on-site personnel.

[0003] At present, in order to reduce the risk of the increase in the top pressure of the blast furnace, the TRT static blade is generally used to adjust the top gas pressure. However, it is found in practice that during the adjustment process of the TRT static blade, the fluctuation of the top pressure of the blast furnace is very large, and manual intervention in adjustment is often required, with low efficiency and great influence.

[0004] In summary, how to improve the adjustment efficiency of the top gas pressure is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a top pressure interlock protection system for blast furnace, and using this top pressure interlock protection system for blast furnace can effectively improve the adjustment efficiency of the top gas pressure.

[0006] Another object of the present invention is to provide a protection method including the above-mentioned top pressure interlock protection system for blast furnace.

[0007] In order to achieve the above objects, the present invention provides the following technical solutions:

[0008] A top pressure interlock protection system for blast furnace, comprising:

[0009] A pressure regulating valve group, including a plurality of regulating valves, the regulating valves are used to communicate between the blast furnace and the gas pipeline network, the plurality of regulating valves are arranged in parallel, and are in parallel with the blast furnace gas pressure recovery turbine generating unit;

[0010] A pressure sensor, which is used to be arranged on the riser pipe at the top of the blast furnace to detect the top gas pressure of the blast furnace;

[0011] A controller, which is signal-connected to the pressure regulating valve group and the pressure sensor to control the action of the pressure regulating valve group according to the pressure detection result.

[0012] Preferably, the regulating valve is a pressure regulating valve, and the controller can control the opening degree of the pressure regulating valve.

[0013] Preferably, the blast furnace gas pressure recovery turbine power generation device includes a first TRT bypass valve, a second TRT bypass valve, a TRT stationary blade, and a turbine;

[0014] The first TRT bypass valve, the second TRT bypass valve, the TRT stationary blade, and the turbine are arranged in parallel, and both the first TRT bypass valve and the second TRT bypass valve are signal-connected to the controller to control the opening and closing of the first TRT bypass valve and the second TRT bypass valve according to the pressure detection result.

[0015] Preferably, it further includes a blow-off valve, and the blow-off valve is used to communicate with the middle height position of the blast furnace.

[0016] Preferably, it further includes a downcomer, a cyclone dust collector, a bag filter, a top blow-off valve, and a gas main pipe;

[0017] The downcomer is arranged obliquely, and the top end of the downcomer is used to communicate with the top of the blast furnace, and the bottom end is communicated with the inlet of the cyclone dust collector;

[0018] The outlet of the cyclone dust collector is communicated with the inlet of the bag filter, and the outlet of the bag filter is communicated with the inlet of the pressure regulating valve group and the inlet of the blast furnace gas pressure recovery turbine power generation device;

[0019] The outlets of the pressure regulating valve group and the blast furnace gas pressure recovery turbine power generation device are both communicated with the first end of the gas main pipe, and the second end of the gas main pipe is used to communicate with the gas pipeline network;

[0020] The top blow-off valve is arranged at the outlet end of the riser pipe at the top of the blast furnace for discharging the gas in the furnace, and the top blow-off valve is signal-connected to the controller to control the opening and closing of the top blow-off valve according to the pressure detection result.

[0021] Preferably, the controller includes a signal acquisition unit, a signal output unit, and a control signal acquisition unit; the signal acquisition unit is used to acquire the top pressure of the blast furnace and is signal-connected to the pressure sensor; the control signal acquisition unit is used to determine the interlock condition according to the top pressure of the blast furnace, and the control signal acquisition unit is signal-connected to the signal acquisition unit; the signal output unit is used to control the action of the corresponding valve according to the interlock condition, and the signal output unit is signal-connected to the control signal acquisition unit, the top blow-off valve, the first TRT bypass valve, the second TRT bypass valve, and the pressure regulating valve group.

[0022] A blast furnace top pressure interlock protection method is applied to the blast furnace top pressure interlock protection system described in any one of the above items. The blast furnace top pressure interlock protection method includes:

[0023] Obtain the compensation air pressure and interlock conditions;

[0024] According to the compensated air pressure and the interlock conditions, control the actions of the pressure regulating valve group, the blast furnace gas top pressure recovery turbine generating device, and the tuyere valve to adjust the top pressure P of the furnace.

[0025] Preferably, the controlling the actions of the pressure regulating valve group, the blast furnace gas top pressure recovery turbine generating device, and the tuyere valve according to the compensated air pressure and the interlock conditions includes:

[0026] Obtain a gradient air pressure interval group, which includes intervals that increase in sequence , interval , interval , interval , interval , interval and interval ;

[0027] Judge which interval in the gradient air pressure interval group the compensated air pressure is located in to determine the interlock conditions;

[0028] The interlock conditions include:

[0029] When the compensated air pressure is located in the interval , control the first TRT bypass valve to open, and set the adjustment target value of the first TRT bypass valve to the difference between the top pressure P of the furnace and the set value ;

[0030] When the compensated air pressure is located in the interval , control the first TRT bypass valve and the first regulating valve to open, and set the adjustment target value of the first regulating valve to the difference between the top pressure P of the furnace and the set value ;

[0031] When the compensated air pressure is located in the interval , control the first TRT bypass valve, the first regulating valve, and the second TRT bypass valve to open, and set the adjustment target value of the second TRT bypass valve to the difference between the top pressure P of the furnace and the set value ;

[0032] When the compensated air pressure is located in the interval When it is, control the opening of the first TRT bypass valve, the first regulating valve, the second TRT bypass valve and the second regulating valve, and set the regulation target value of the second regulating valve to the difference between the top pressure P of the furnace and the set value ;

[0033] When the compensation air pressure is within the interval control the opening of the first TRT bypass valve, the first regulating valve, the second TRT bypass valve, the second regulating valve and the third regulating valve, and set the regulation target value of the third regulating valve to the difference between the top pressure P of the furnace and the set value ;

[0034] When the compensation air pressure is within the interval control the opening of the first TRT bypass valve, the first regulating valve, the second TRT bypass valve, the second regulating valve, the third regulating valve and the fourth regulating valve, and set the regulation target value of the fourth regulating valve to the difference between the top pressure P of the furnace and the set value ;

[0035] When the compensation air pressure is within the interval control the opening of the first TRT bypass valve, the first regulating valve, the second TRT bypass valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the blast valve, and set the regulation target value of the blast valve to the difference between the top pressure P of the furnace and the set value ;

[0036] Preferably, the interval is that the difference between the top pressure P of the furnace and the set value is greater than 3 kPa and less than or equal to 4 kPa;

[0037] The interval is that the difference between the top pressure P of the furnace and the set value is greater than 4 kPa and less than or equal to 5 kPa;

[0038] The interval is that the difference between the top pressure P of the furnace and the set value is greater than 5 kPa and less than or equal to 6 kPa;

[0039] The interval is that the difference between the top pressure P of the furnace and the set value is greater than 6 kPa and less than or equal to 10 kPa;

[0040] The interval is that the difference between the top pressure P of the furnace and the set value The difference is greater than 10 kPa and less than or equal to 15 kPa;

[0041] The said interval is the difference between the top pressure P of the blast furnace and the set value is greater than 15 kPa; or, the top pressure P of the blast furnace is greater than 270 kPa and less than or equal to 285 kPa;

[0042] The said interval is that the top pressure P of the blast furnace is greater than 285 kPa.

[0043] Preferably, while setting the adjustment target value of the third regulating valve to the compensation air pressure it also includes: controlling the opening degree of the third regulating valve to be 40 ;

[0044] While setting the adjustment target value of the fourth regulating valve to the compensation air pressure it also includes: controlling the opening degree of the fourth regulating valve to be 80 ;

[0045] While setting the adjustment target value of the blowdown valve to the compensation air pressure it also includes: controlling the opening degree of the blowdown valve to be 15 .

[0046] In the blast furnace top pressure interlock protection system provided by the present invention, in the pressure regulating valve group, several regulating valves and the blast furnace gas pressure recovery turbine power generation device are arranged in parallel, that is, the inlets of several regulating valves and the inlet of the blast furnace gas pressure recovery turbine power generation device are respectively connected with corresponding intake branch pipelines to be connected to the top of the blast furnace during use, and the outlets of several regulating valves and the outlet of the blast furnace gas pressure recovery turbine power generation device are respectively connected with corresponding outlet branch pipelines to be connected to the gas pipeline network during use, so that the top pressure of the blast furnace can be adjusted by several regulating valves, and the blast furnace gas pressure recovery turbine power generation device receives high-temperature gas for power generation; the pressure sensor is arranged in the riser pipe at the top of the blast furnace for the gas to rise and discharge during use, and the detection end of the pressure sensor is inserted into the inside of the riser pipe to be able to detect the top pressure of the blast furnace.

[0047] They are cooperatively configured. The protection system is equipped with a controller, which can be wirelessly connected or wired to the pressure sensor and the pressure regulating valve group through a cable, so that the detection results of the pressure sensor can be received by the controller, and the actions of the regulating valve seat can be controlled by the controller. For example, the opening degree of the regulating valve, or the closing or opening of the regulating valve, etc. Thus, under normal conditions, the original pressure regulating device of the blast furnace is used for adjustment to stabilize the top pressure of the furnace, making it consistent with the set value. When the top pressure of the furnace is unstable, the opening and closing of several regulating valves are controlled by the controller to automatically achieve multi-stage pressure regulation, effectively improving the regulation efficiency of the top pressure of the furnace and being beneficial to reducing the fluctuation of the top pressure of the furnace. Brief Description of the Drawings

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0049] Figure 1 It is a schematic structural diagram of a specific embodiment provided by the present invention.

[0050] Reference Signs:

[0051] 1 - Blast furnace; 2 - Upcomer; 3 - Blast furnace top gas pressure recovery turbine power generation device; 31 - First TRT bypass valve; 32 - Second TRT bypass valve; 33 - TRT static blade; 34 - Turbine; 4 - Pressure regulating valve group; 41 - Regulating valve; 5 - Pressure sensor; 6 - Controller; 7 - Top gas relief valve; 8 - Downcomer; 9 - Cyclone dust collector; 10 - Bag filter; 11 - Bleed valve. Detailed Embodiments

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0053] The core of the present invention is to provide a blast furnace top pressure interlock protection system, and using this blast furnace top pressure interlock protection system can effectively improve the regulation efficiency of the top pressure of the furnace. Another core of the present invention is to provide a protection method including the above blast furnace top pressure interlock protection system.

[0054] Please refer to Figure 1, the present invention provides a top pressure interlock protection system for a blast furnace, including a pressure regulating valve group 4, a pressure sensor 5, and a controller 6. Among them, the pressure regulating valve group 4 includes a number of regulating valves 41, and the regulating valves 41 are used to communicate between the blast furnace 1 and the gas pipeline network. The number of regulating valves 41 is arranged in parallel, and is connected in parallel to the blast furnace gas pressure recovery turbine power generation device 3; the pressure sensor 5 is used to be arranged on the riser pipe 2 at the top of the blast furnace 1 to detect the top gas pressure of the blast furnace 1; the controller 6 is signal-connected to the pressure regulating valve group 4 and the pressure sensor 5 to control the action of the pressure regulating valve group 4 according to the pressure detection result.

[0055] In the pressure regulating valve group 4, a number of regulating valves 41 and the blast furnace gas pressure recovery turbine power generation device 3 are arranged in parallel, that is, the inlets of a number of regulating valves 41 and the inlet of the blast furnace gas pressure recovery turbine power generation device 3 are respectively connected with corresponding intake branch pipelines to communicate with the top of the blast furnace 1 during use, and the outlets of a number of regulating valves 41 and the outlet of the blast furnace gas pressure recovery turbine power generation device 3 are respectively connected with corresponding outlet branch pipelines to communicate with the gas pipeline network during use. Thus, the top gas pressure of the blast furnace 1 can be adjusted by a number of regulating valves 41, and the high-temperature gas can be received by the blast furnace gas pressure recovery turbine power generation device 3 for power generation. It should be noted that the type and number of the regulating valves 41 are not limited, such as pressure reducing valves, as long as the gas pressure can be adjusted; when in use, the pressure sensor 5 is arranged on the riser pipe 2 at the top of the blast furnace 1 for the gas to rise and discharge, and the detection end of the pressure sensor 5 is inserted into the inside of the riser pipe 2 to be able to detect the top gas pressure of the blast furnace 1.

[0056] Correspondingly, the protection system is configured with a controller 6, and the controller 6 can be wirelessly connected or wired-connected to the pressure sensor 5 and the pressure regulating valve group 4 through a cable, so as to be able to receive the detection result of the pressure sensor 5 through the controller 6, and be able to control the action of the regulating valve 41 seat through the controller 6, such as the opening degree of the regulating valve 41, or the closing or opening of the regulating valve 41, etc. Thus, under normal conditions, the top gas pressure is adjusted by the original pressure regulating device of the blast furnace 1 to be stable and consistent with the set value. When the top gas pressure becomes unstable, the opening and closing of a number of regulating valves 41 are controlled by the controller 6 to automatically achieve multi-stage pressure regulation, effectively improving the regulation efficiency of the top gas pressure and being beneficial to reducing the fluctuation of the top gas pressure.

[0057] On the basis of the above embodiments, the regulating valve 41 is a pressure regulating valve, and the controller 6 can control the opening degree of the pressure regulating valve to further reduce the fluctuation during the top gas pressure regulation process.

[0058] On the basis of the above embodiments, the blast furnace gas pressure recovery turbine power generation device 3 includes a first TRT bypass valve 31, a second TRT bypass valve 32, a TRT stationary blade 33, and a turbine 34; the first TRT bypass valve 31, the second TRT bypass valve 32, the TRT stationary blade 33, and the turbine 34 are arranged in parallel, and both the first TRT bypass valve 31 and the second TRT bypass valve 32 are signal-connected to the controller 6 to control the opening and closing of the first TRT bypass valve 31 and the second TRT bypass valve 32 according to the pressure detection result.

[0059] The arrangement in parallel of the first TRT bypass valve 31, the second TRT bypass valve 32, the TRT stationary blade 33, and the turbine 34 is specifically, as Figure 1 shown, the inlet of the first TRT bypass valve 31, the inlet of the second TRT bypass valve 32, the inlet of the TRT stationary blade 33, and the inlet of the turbine 34 are respectively connected to one end of the first branch pipeline, and the other end of the first branch pipeline is connected to the air inlet of the blast furnace gas pressure recovery turbine power generation device 3; similarly, the outlet of the first TRT bypass valve 31, the outlet of the second TRT bypass valve 32, the outlet of the TRT stationary blade 33, and the outlet of the turbine 34 are respectively connected to one end of the second branch pipeline, and the other end of the second branch pipeline is connected to the air outlet of the blast furnace gas pressure recovery turbine power generation device 3, so as to improve the furnace top gas pressure regulation ability while improving the recovery rate of gas energy, saving energy and reducing emissions.

[0060] It should be noted that the layout of the internal pipelines of the blast furnace gas pressure recovery turbine power generation device 3 is not limited, as long as the above functions can be achieved. For example, in some specific embodiments, one end of the five-way joint A is the inlet end of the blast furnace gas pressure recovery turbine power generation device 3, and the other ends of the first branch pipelines connected to the first TRT bypass valve 31, the second TRT bypass valve 32, the TRT stationary blade 33, and the turbine 34 are respectively connected to the remaining ends of the five-way joint A. Similarly, one end of the five-way joint B is the outlet end of the blast furnace gas pressure recovery turbine power generation device 3, and the other ends of the second branch pipelines connected to the first TRT bypass valve 31, the second TRT bypass valve 32, the TRT stationary blade 33, and the turbine 34 are respectively connected to the remaining ends of the five-way joint B; or, in some other specific embodiments, one end of the three-way joint A is the inlet end of the blast furnace gas pressure recovery turbine power generation device 3, and the other ends of the first branch pipelines connected to the TRT stationary blade 33 and the turbine 34 are respectively connected to the remaining ends of the three-way joint A. The first TRT bypass valve 31 is connected to the first branch pipeline connected to it, and the three-way joint B at the other end of this first branch pipeline is connected to the first branch pipeline connected to the TRT stationary blade 33. Similarly, one end of the three-way joint C is the outlet end of the blast furnace gas pressure recovery turbine power generation device 3, and the other ends of the second branch pipelines connected to the TRT stationary blade 33 and the turbine 34 are respectively connected to the remaining ends of the three-way joint C. The first TRT bypass valve 31 is connected to the second branch pipeline connected to it, and the three-way joint D at the other end of this second branch pipeline is connected to the second branch pipeline connected to the TRT stationary blade 33.

[0061] When the top pressure of the blast furnace is much higher than the set value, it can efficiently stabilize the top pressure of the blast furnace. On the basis of the above embodiments, it further includes a blow-down valve 11, and the blow-down valve 11 is used to communicate with the middle height position of the blast furnace 1 to reduce the amount of gas with high pressure floating upward.

[0062] On the basis of the above embodiments, it further includes a downcomer 8, a cyclone dust collector 9, a bag filter 10, a top blow-off valve 7, and a gas main pipe; the downcomer 8 is used to be arranged obliquely, and the top end of the downcomer 8 is used to communicate with the top of the blast furnace 1, and the bottom end is communicated with the inlet of the cyclone dust collector 9; the outlet of the cyclone dust collector 9 is communicated with the inlet of the bag filter 10, and the outlet of the bag filter 10 is communicated with the inlet of the pressure regulating valve group 4 and the inlet of the blast furnace gas pressure recovery turbine power generation device 3; the outlets of the pressure regulating valve group 4 and the blast furnace gas pressure recovery turbine power generation device 3 are both communicated with the first end of the gas main pipe, and the second end of the gas main pipe is used to communicate with the gas pipeline network; the top blow-off valve 7 is used to be arranged at the outlet end of the riser pipe 2 at the top of the blast furnace 1 for discharging the gas in the furnace, and the top blow-off valve 7 is signal-connected to the controller 6 to control the opening and closing of the top blow-off valve 7 according to the pressure detection result.

[0063] As Figure 1As shown, the downcomer 8 is inclined, and the upper left end of the downcomer 8 is connected to the top of the blast furnace 1, so that the top gas can be led out. The lower right end of the downcomer 8 is connected to the inlet of the cyclone dust collector 9, and then the outlet of the cyclone dust collector 9 is connected to the inlet of the cloth belt dust collector. The outlet of the cloth belt dust collector is connected to the inlet of the pressure regulating valve group 4 and the blast furnace gas top pressure turbine power generation device 3, so as to achieve secondary dust removal and transport the efficiently dust-removed gas into the outlet of the pressure regulating valve group 4 and the blast furnace gas top pressure turbine power generation device 3 to realize gas power generation and top pressure regulation of the blast furnace. The outlets of the pressure regulating valve group 4 and the blast furnace gas top pressure turbine power generation device 3 are connected to the left end of the gas main pipe. When in use, the right end of the gas main pipe is connected to the gas pipeline network, and then the remaining gas can be discharged through the gas pipeline network.

[0064] Furthermore, to ensure the production safety of the blast furnace 1, a top discharge valve 7 is provided at the upper end of the riser pipe 2 at the top of the blast furnace 1 to discharge the excess pressure.

[0065] On the basis of the above embodiment, the controller 6 includes a signal acquisition unit, a signal output unit, and a control signal acquisition unit; the signal acquisition unit is used to acquire the top pressure of the blast furnace and is signal-connected to the pressure sensor 5; the control signal acquisition unit is used to determine the interlock condition according to the top pressure of the blast furnace, and the control signal acquisition unit is signal-connected to the signal acquisition unit; the signal output unit is used to control the action of the corresponding valve according to the interlock condition, and the signal output unit is signal-connected to the control signal acquisition unit, the top discharge valve 7, the first TRT bypass valve 31, the second TRT bypass valve 32, and the pressure regulating valve group 4.

[0066] In the controller 6, the signal acquisition unit is signal-connected to the pressure sensor 5 to acquire the detection result of the pressure sensor 5. The signal output unit is signal-connected to the top discharge valve 7, the first TRT bypass valve 31, the second TRT bypass valve 32, and the pressure regulating valve group 4 to control their opening and closing and / or opening degree, etc. And the signal acquisition unit, the control signal acquisition unit, and the signal output unit are sequentially signal-connected. Thus, the control signal acquisition unit can acquire the top pressure signal transmitted by the signal acquisition unit, perform a series of processing processes such as calculation, comparison, and analysis based on the top pressure signal, obtain the interlock condition, and then transmit the interlock condition to the signal output unit, so as to control the corresponding valve to realize the regulation of the top pressure of the blast furnace.

[0067] In addition to the above blast furnace top pressure interlock protection system, the present invention also provides a protection method including the blast furnace top pressure interlock protection system disclosed in the above embodiment. The protection method includes the following steps:

[0068] Obtain the compensation pressure and the interlock condition; it can be understood that first, the top pressure P of the blast furnace is acquired in real time, and thereby the compensation pressure is determined. For example, the compensation pressure The difference between the real-time top pressure P and the set value can be used. Alternatively, the real-time top pressure P etc. can be directly used, and the interlock conditions required for subsequent judgment can be obtained, so as to facilitate the operation of subsequent pressure regulation.

[0069] Step S2: Control the actions of the pressure regulating valve group 4, the blast furnace gas pressure recovery turbine power generation device 3 and the blowdown valve 11 according to the compensation pressure and the interlock conditions to adjust the top pressure P; it can be understood that by means of the compensation pressure the interlock conditions are determined to control the opening or closing of the pressure regulating valve group 4, the blast furnace gas pressure recovery turbine power generation device 3 and the blowdown valve 11, and further, the opening degrees of the pressure regulating valve group 4 and / or the blast furnace gas pressure recovery turbine power generation device 3 and / or the blowdown valve 11 can be regulated, thereby reducing the fluctuations during the process of adjusting the pressure.

[0070] On the basis of the above embodiments,

[0071] Obtain a gradient pressure interval group, which includes intervals , interval , interval , interval , interval , interval and interval ; it can be understood that in order to cope with various working conditions of abnormal increase in the top pressure of the blast furnace, based on the pressure regulating valve group 4 set by the above blast furnace top pressure interlock protection system, which includes four regulating valves 41, the blast furnace gas pressure recovery turbine power generation device 3 includes a first TRT bypass valve 31 and a second TRT bypass valve 32, and a blowdown valve 11 is provided, the continuously rising pressure interval higher than the set value is divided into seven intervals that increase in sequence, namely interval , interval , interval , interval , interval , interval and interval , for example, interval is that the difference between the top pressure P and the set value is greater than 2 kPa; interval is that the difference between the top pressure P and the set value is greater than 4 kPa, interval is that the difference between the top pressure P and the set value is greater than 6 kPa, interval is that the difference between the top pressure P and the set value is greater than 8 kPa, interval is that the difference between the top pressure P and the set value is greater than 10 kPa, interval When the difference between the top pressure P of the furnace and the set value is greater than 12 kPa, the range When the difference between the top pressure P of the furnace and the set value is greater than 14 kPa.

[0072] Determine which range in the gradient pressure range group the compensation pressure is located in to determine the interlock condition; it can be understood that the obtained compensation pressure is compared with each range, and then according to which range the current top pressure of the furnace is located, the opening and closing of the corresponding valve and / or the opening degree of the corresponding valve are controlled.

[0073] The interlock conditions include: when the compensation pressure is located in the range , control the first TRT bypass valve 31 to open, and set the adjustment target value of the first TRT bypass valve 31 to the difference between the top pressure P of the furnace and the set value ;

[0074] When the compensation pressure is located in the range , control the first TRT bypass valve 31 and the first regulating valve 41 to open, and set the adjustment target value of the first regulating valve 41 to the difference between the top pressure P of the furnace and the set value ;

[0075] When the compensation pressure is located in the range , control the first TRT bypass valve 31, the first regulating valve 41 and the second TRT bypass valve 32 to open, and set the adjustment target value of the second TRT bypass valve 32 to the difference between the top pressure P of the furnace and the set value ;

[0076] When the compensation pressure is located in the range , control the first TRT bypass valve 31, the first regulating valve 41, the second TRT bypass valve 32 and the second regulating valve 41 to open, and set the adjustment target value of the second regulating valve 41 to the difference between the top pressure P of the furnace and the set value ;

[0077] When the compensation pressure is located in the range , control the first TRT bypass valve 31, the first regulating valve 41, the second TRT bypass valve 32, the second regulating valve 41 and the third regulating valve 41 to open, and set the adjustment target value of the third regulating valve 41 to the difference between the top pressure P of the furnace and the set value ;

[0078] When the compensation pressure is located in the range When it is, control the opening of the first TRT bypass valve 31, the first regulating valve 41, the second TRT bypass valve 32, the second regulating valve 41, the third regulating valve 41, and the fourth regulating valve 41, and set the regulation target value of the fourth regulating valve 41 to the difference between the furnace top gas pressure P and the set value ;

[0079] When the compensation gas pressure is in the interval control the opening of the first TRT bypass valve 31, the first regulating valve 41, the second TRT bypass valve 32, the second regulating valve 41, the third regulating valve 41, the fourth regulating valve 41, and the air release valve 11, and set the regulation target value of the air release valve 11 to the difference between the furnace top gas pressure P and the set value ;

[0080] It can be understood that during use, since the furnace top gas pressure P continuously rises from the set value , the furnace top gas pressure P will successively fall into the interval , the interval , the interval , the interval , the interval . Then when the furnace top gas pressure P falls into , only control the opening of the first TRT bypass valve 31. The furnace top gas pressure P continues to rise until it falls into , then additionally control the opening of the first regulating valve 41, and set the regulation target value of the first regulating valve 41 to be equal to the difference between the current furnace top gas pressure P and the set value ; Similarly, when the furnace top gas pressure P continues to rise until it falls into , additionally control the opening of the second TRT bypass valve 32, and set the regulation target value of the second TRT bypass valve 32 to be equal to the difference between the current furnace top gas pressure P and the set value ; Furthermore, when the furnace top gas pressure P continues to rise until it falls into , , , , successively additionally control the opening of the second regulating valve 41, the third regulating valve 41, the fourth regulating valve 41, and the air release valve 11, and set the regulation target value of the newly opened valve to be equal to the difference between the current furnace top gas pressure P and the set value . By corresponding to different gas pressure fluctuation intervals with corresponding interlocking conditions, that is, controlling the actions of the corresponding valves, the fluctuation of the furnace top gas pressure P can be accurately controlled. And because the gradient gas pressure interval is refined, the initial warning value of the furnace top gas pressure P fluctuation can be effectively reduced. Through different interlocking conditions, the furnace top pressure is regulated in gradients, the control measures are advanced greatly, and the time for handling when the furnace top pressure abnormally rises due to abnormal reasons is effectively shortened, improving the safety performance.

[0081] To improve safety performance and reduce the fluctuation of the top pressure, based on the above embodiments, the interval is the difference between the top gas pressure P and the set value ; the interval is the difference between the top gas pressure P and the set value ; the interval is the difference between the top gas pressure P and the set value ; the interval is the difference between the top gas pressure P and the set value ; the interval is the difference between the top gas pressure P and the set value ; the interval is the difference between the top gas pressure P and the set value ; alternatively, the top gas pressure the interval is the top gas pressure .

[0082] To further precisely reduce the gas pressure fluctuation, based on the above embodiments, while setting the adjustment target value of the third regulating valve 41 to the compensated gas pressure , it further includes: controlling the opening degree of the third regulating valve 41 to 40 ;

[0083] while setting the adjustment target value of the fourth regulating valve 41 to the compensated gas pressure , it further includes: controlling the opening degree of the fourth regulating valve 41 to 80 ;

[0084] while setting the adjustment target value of the blast valve 11 to the compensated gas pressure , it further includes: controlling the opening degree of the blast valve 11 to 15 .

[0085] It should be noted that the relative terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities; the "upper surface, lower surface, top, bottom" and the orientation terms "up, down, left, right" mentioned above are all defined based on the drawings of the specification.

[0086] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0087] The blast furnace top pressure interlock protection system and protection method provided by the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A blast furnace top pressure interlock protection system, characterized in that, Comprising: A pressure regulating valve group (4), including a number of regulating valves (41), the regulating valves (41) being used to connect to the blast furnace (1) and the gas pipeline network, a number of the regulating valves (41) being arranged in parallel, and being connected in parallel to the blast furnace gas top pressure recovery turbine generating unit (3); A pressure sensor (5), being used to be arranged on the riser pipe (2) at the top of the blast furnace (1) to detect the top gas pressure of the blast furnace (1); A controller (6), being signal-connected to the pressure regulating valve group (4) and the pressure sensor (5) to control the operation of the pressure regulating valve group (4) according to the pressure detection result.

2. The top pressure interlock protection system for blast furnace according to claim 1, characterized in that, The regulating valve (41) is a pressure regulating valve, and the controller (6) can control the opening degree of the pressure regulating valve.

3. The top pressure interlock protection system for blast furnace according to claim 2, characterized in that, The blast furnace gas top pressure recovery turbine generating unit (3) includes a first TRT bypass valve (31), a second TRT bypass valve (32), a TRT stationary blade (33) and a turbine (34); The first TRT bypass valve (31), the second TRT bypass valve (32), the TRT stationary blade (33) and the turbine (34) are arranged in parallel, and both the first TRT bypass valve (31) and the second TRT bypass valve (32) are signal-connected to the controller (6) to control the opening and closing of the first TRT bypass valve (31) and the second TRT bypass valve (32) according to the pressure detection result.

4. The top pressure interlock protection system for blast furnace according to claim 3, characterized in that, It further includes a blow-off valve (11), the blow-off valve (11) being used to connect to the middle height position of the blast furnace (1).

5. The top pressure interlock protection system for blast furnace according to claim 4, characterized in that, It further includes a downcomer (8), a cyclone dust collector (9), a bag filter (10), a top blow-off valve (7) and a gas main pipe; The downcomer (8) is used to be arranged obliquely, and the top end of the downcomer (8) is used to connect to the top of the blast furnace (1), and the bottom end is connected to the inlet of the cyclone dust collector (9); The outlet of the cyclone dust collector (9) is connected to the inlet of the bag filter (10), and the outlet of the bag filter (10) is connected to the inlet of the pressure regulating valve group (4) and the inlet of the blast furnace gas top pressure recovery turbine generating unit (3); The outlets of the pressure regulating valve group (4) and the blast furnace gas top pressure recovery turbine generating unit (3) are both connected to the first end of the gas main pipe, and the second end of the gas main pipe is used to connect to the gas pipeline network; The top blow-off valve (7) is used to be arranged at the gas outlet end of the riser pipe (2) at the top of the blast furnace (1) to discharge the gas in the furnace, and the top blow-off valve (7) is signal-connected to the controller (6) to control the opening and closing of the top blow-off valve (7) according to the pressure detection result.

6. The top pressure interlock protection system for blast furnace according to claim 5, characterized in that, The controller (6) includes a signal acquisition unit, a signal output unit, and a control signal acquisition unit; the signal acquisition unit is used to acquire the top pressure of the furnace, and is signal-connected to the pressure sensor (5); the control signal acquisition unit is used to determine the interlock conditions according to the top pressure of the furnace, and the control signal acquisition unit is signal-connected to the signal acquisition unit; the signal output unit is used to control the actions of the corresponding valves according to the interlock conditions, and the signal output unit is signal-connected to the control signal acquisition unit, the top blow-off valve (7), the first TRT bypass valve (31), the second TRT bypass valve (32), and the pressure regulating valve group (4).

7. A blast furnace top pressure interlock protection method, characterized in that, Applied to the blast furnace top pressure interlock protection system according to any one of claims 1-6, the blast furnace top pressure interlock protection method includes: Obtain compensation air pressure and interlock conditions; According to the compensated air pressure and the interlock condition, control the actions of the pressure regulating valve group (4), the blast furnace gas top pressure recovery turbine generating device (3) and the tuyere valve (11) to adjust the top pressure P of the furnace.

8. The blast furnace top pressure interlock protection method according to claim 7, characterized in that, According to the compensated air pressure and the interlock condition, controlling the actions of the pressure regulating valve group (4), the blast furnace gas top pressure recovery turbine generating device (3) and the tuyere valve (11), including: Obtain a gradient air pressure interval group, where the gradient air pressure interval group includes intervals that increase in sequence , interval , interval , interval , interval , interval and interval ; Determine the compensated air pressure in which interval of the gradient air pressure interval group to determine the interlock condition; The interlock conditions include: When the compensation air pressure is within the interval , control the opening of the first TRT bypass valve (31), and set the adjustment target value of the first TRT bypass valve (31) to the difference between the top furnace air pressure P and the set value . When the compensation air pressure is within the said range control the opening of the first TRT bypass valve (31) and the first regulating valve (41), and set the regulating target value of the first regulating valve (41) to the difference between the top pressure P of the furnace and the set value ; When the compensation air pressure is within the interval , control the opening of the first TRT bypass valve (31), the first regulating valve (41) and the second TRT bypass valve (32), and set the regulation target value of the second TRT bypass valve (32) to the difference between the top furnace air pressure P and the set value ; When the compensation air pressure is within the said interval , open the first TRT bypass valve (31), the first regulating valve (41), the second TRT bypass valve (32) and the second regulating valve (41), and set the regulating target value of the second regulating valve (41) to the difference between the top pressure P of the furnace and the set value . When the compensation air pressure is within the said range control the opening of the first TRT bypass valve (31), the first regulating valve (41), the second TRT bypass valve (32), the second regulating valve (41) and the third regulating valve (41), and set the regulating target value of the third regulating valve (41) to the difference between the top furnace air pressure P and the set value ; When the compensation air pressure is within the said range control the opening of the first TRT bypass valve (31), the first regulating valve (41), the second TRT bypass valve (32), the second regulating valve (41), the third regulating valve (41) and the fourth regulating valve (41), and set the regulating target value of the fourth regulating valve (41) to the difference between the top pressure P of the furnace and the set value ; When the compensation air pressure is within the said range control the opening of the first TRT bypass valve (31), the first regulating valve (41), the second TRT bypass valve (32), the second regulating valve (41), the third regulating valve (41), the fourth regulating valve (41) and the gas release valve (11), and set the regulation target value of the gas release valve (11) as the difference between the top furnace gas pressure P and the set value .

9. The blast furnace top pressure interlock protection method according to claim 8, characterized in that, The interval is the difference between the top pressure P of the furnace and the set value , greater than 3 kPa and less than or equal to 4 kPa; The interval is that the difference between the top pressure P of the furnace and the set value is greater than 4 kPa and less than or equal to 5 kPa; The interval is such that the difference between the top pressure P of the furnace and the set value is greater than 5 kPa and less than or equal to 6 kPa; The interval is that the difference between the top pressure P of the furnace and the set value is greater than 6 kPa and less than or equal to 10 kPa; The interval is such that the difference between the top pressure P of the furnace and the set value is greater than 10 kPa and less than or equal to 15 kPa; The interval is that the difference between the top pressure P of the furnace and the set value is greater than 15 kPa; or the top pressure P of the furnace is greater than 270 kPa and less than or equal to 285 kPa; The interval is that the top pressure P of the furnace is greater than 285 kPa.

10. The blast furnace top pressure interlock protection method according to claim 9, characterized in that, Setting the adjustment target value of the third regulating valve (41) to the compensated air pressure also includes: controlling the opening degree of the third regulating valve (41) to 40 ; Setting the adjustment target value of the fourth regulating valve (41) to the compensation air pressure also includes: controlling the opening degree of the fourth regulating valve (41) to 80 ; Setting the adjustment target value of the bleed valve (11) to the compensation air pressure also includes: controlling the opening degree of the bleed valve (11) to 15 .

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