A device and method for automatically clearing and taking pressure of blast furnace material tank pressure

Abstract

The invention discloses an automatic clearing and pressure-taking device and method for a blast furnace material tank pressure. The device comprises a dirty gas pressure-taking device, a pneumatic clearing device, a pressure-taking and purging device, and a computer pressure-equalizing control system. The pneumatic clearing device is connected to the dirty gas pressure-taking device through bolts, the inlet end of a constant-current purging device of the pressure-taking and purging device is connected to instrument nitrogen, and the outlet is respectively connected to the material tank pressure and a pressure-taking ball valve through pressure-taking and purging pipelines, and the computer pressure-equalizing control system is respectively connected to the devices through control lines. The technical solution of the invention overcomes the influence of adverse conditions such as furnace charge dust in the material tank, avoids the occurrence of failures that affect the normal production of the blast furnace due to frequent blockage at the bottom of the device, and completely eliminates the high difficulty of work, high labor intensity, and safety hazards of easy gas poisoning due to relying on manual gas cleaning and unblocking devices, fully realizes the automatic clearing function of the dirty gas pressure-taking device of the material tank, improves the automatic control capability, and achieves the purpose of maintenance-free.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical automation instrument control, and relates to a dirty gas pressure taking detection system for an ironmaking blast furnace feed tank, and specifically to an automatic pressure clearing and pressure taking device and method for a blast furnace feed tank. Background Art

[0002] During the blast furnace smelting process, the material tank acts as an intermediate storage bin to continuously provide various charges to the blast furnace. Due to the high pressure inside the blast furnace, every time charge is put into the blast furnace, the material tank must be pressurized and released to balance the pressure inside the tank.

[0003] During the loading process of the material tank, the first equalizing pressure valve, the second equalizing pressure valve and the lower tight valve are in the closed state, and the pressure relief valve and the upper tight valve are in the open state. At this time, the pressure in the material tank is zero, and the charge in the hopper enters the material tank by opening the upper tight valve. When the material tank is full, the loading is completed; during the pressure charging process, the upper tight valve and the pressure relief valve are closed, and the first equalizing pressure valve is opened to fill the material tank with blast furnace semi-clean coal gas. The pressure of the material tank rises rapidly from zero. When the pressure in the material tank is equal to the pressure on the furnace top, the pressure charging is completed; during the unloading process, the first equalizing pressure valve is closed and the lower tight valve is opened. The charge in the material tank enters the blast furnace through the lower tight valve. When the charge in the material tank is emptied, the unloading is completed; during the pressure relief process, the lower tight valve is closed, and then the vent valve is opened to discharge the gas in the material tank. At this time, the pressure in the material tank drops rapidly. When the pressure in the material tank drops to zero, the pressure relief is completed. At this time, the upper tight valve is opened again to enter the material tank loading process.

[0004] The above-mentioned repetitive cycle process can easily cause a large amount of dust in the material tank to adhere to the inner wall of the material tank and the filling and relief pipes, thereby causing the bottom of the dirty gas pressure-taking device of the material tank to be blocked. Therefore, in order to prevent the dirty gas pressure-taking device of the material tank from being blocked, a constant-flow gas purge device is generally installed on the sampling pipeline to continuously purge the pressure-taking device to prevent the pressure-taking device from being blocked. However, this conventional detection method still cannot overcome the adverse conditions such as the dust of the furnace charge in the material tank, and still causes the dirty gas pressure-taking device of the material tank to be frequently blocked. At this time, it is necessary to rely on manual gas cleaning and unblocking of the pressure-taking device. Since the gas filled in the material tank is blast furnace gas or nitrogen, there are safety hazards of gas poisoning and suffocation in cleaning and unblocking the pressure-taking device. At the same time, there is also the problem of untimely fault handling affecting the normal loading of the blast furnace, resulting in a reduction in wind or even a shutdown of the blast furnace.

[0005] Therefore, the blast furnace charge pressure taking device is often blocked, which is a technical problem that the instrument maintenance personnel need to solve urgently. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problems of frequent blockage of blast furnace charge tank pressure taking devices mentioned above, and to provide a blast furnace charge tank pressure automatic clearing and pressure taking device and method, which solves the technical problems of frequent blockage of traditional charge tank dirty gas pressure taking devices, safety hazards in fault handling and delayed handling time.

[0007] The technical solution adopted by the present invention is as follows: a blast furnace material tank pressure automatic clearing and pressure taking device and method, the device specifically includes a dirty gas pressure taking device, a pneumatic clearing device, a pressure taking and blowing device and a computer pressure equalization control system.

[0008] The dirty gas pressure taking device comprises a dirty gas pressure taking pipe, a dirty gas pressure taking short pipe, a manual clearing ball valve, a pressure taking conduit and a pressure taking ball valve.

[0009] A manual clearing ball valve is installed at one end of the dirty gas pressure taking short pipe, and the other end is welded at an angle to the dirty gas pressure taking pipe, and the center lines of the two pipes intersect at point A, so that when the manual clearing ball valve is opened, the accumulated dust at the bottom of the dirty gas pressure taking pipe can be manually cleaned. One end of the pressure taking conduit is welded to the dirty gas pressure taking short pipe, and a pressure taking ball valve is installed at the other end. The pressure taking ball valve is mainly used to connect the pressure taking and purge pipeline.

[0010] The pneumatic clearing device comprises a cylinder, a cylinder piston, a piston rod, a clearing probe, a two-position five-way solenoid valve, an air nozzle, an air pipe, and a pressure reducing filter.

[0011] Furthermore, the outlet A and B ends of the two-position five-way solenoid valve are respectively connected to the air nozzle of the pneumatic clearing device through air pipes, the inlet P end of the two-position five-way solenoid valve is connected to the outlet end of the pressure reducing filter, the inlet end of the pressure reducing filter is connected to the nitrogen source, one end of the piston rod is connected to the cylinder piston, and the other end is connected to the clearing probe, the piston rod is sealed to the top of the cylinder, so that the gas in the cylinder is not connected to the gas in the dirty gas pressure taking pipe.

[0012] Furthermore, the clearing probe is composed of four stainless steel barbs welded around a disc, with a hole in the middle of the disc for clamping and connecting with the piston rod nut. The clearing probe is beneficial for conducting gas on the one hand, and on the other hand, to prevent failure of the solenoid valve or cylinder. When the clearing probe is at the bottom of the dirty gas pressure taking device, the cleaning tool can still pass through the gap between the four steel barbs through the open manual clearing ball valve to reach the bottom of the dirty gas pressure taking device for manual clearing.

[0013] The main function of the pressure reducing filter is to provide pure gas with pressure meeting the requirements for the two-position five-way solenoid valve and the cylinder. The two-position five-way solenoid valve is connected to the cylinder through an air pipe and an air nozzle, realizing the conversion from electric control to pneumatic driving the cylinder piston, piston rod and clearing probe to complete the clearing task.

[0014] Furthermore, one end of the dirty gas pressure taking pipe in the pneumatic blockage clearing device is connected to the dirty gas pressure taking device by bolts, and the other end of the dirty gas pressure taking pipe is welded to the tank filling and relief pipe. The connection part is sealed with a sealing gasket to ensure that the pressurized gas in the dirty gas pressure taking device does not leak. The combination of the two constitutes an automatic blockage clearing and pressure taking device.

[0015] The pressure-taking and purging device comprises a tank pressure, a constant-flow purging device, and a pressure-taking and purging pipeline.

[0016] Furthermore, one end of the pressure-taking and purge pipeline is connected to the pressure-taking ball valve of the dirty gas pressure-taking device, and the other end is connected to the material tank pressure and constant-flow purge device. The constant-flow purge device continuously purges nitrogen into the dirty gas pressure-taking device through the pressure-taking and purge pipeline to prevent the pressure-taking device from being blocked. At the same time, the material tank pressure detects the pressure parameters in the pressure-taking and purge pipeline in real time.

[0017] The computer pressure equalizing control system is respectively connected with a two-position five-way solenoid valve, a first pressure equalizing valve, a second pressure equalizing valve, a pressure relief valve, furnace top pressure, material tank pressure, an upper sealing valve, and a lower sealing valve through a control line.

[0018] Furthermore, there are two sets of each of the one equalizing pressure valve, the two equalizing pressure valves and the pressure relief valve, which are mainly used for charging and releasing pressure in the material tank. Under normal circumstances, there are two sets, one for backup and the other for use. The one equalizing pressure valve is mainly used to charge the material tank with semi-clean coal gas from blast furnace, and the two equalizing pressure valves are mainly used to charge the material tank with pressurized coal gas or nitrogen. Its main function is to serve as a backup or supplementary pressure for the one equalizing pressure valve, and the pressure relief valve is mainly used to discharge the gas in the material tank; the main function of the furnace top pressure and the material tank pressure is to input the pressure signals detected by each into the computer equalizing pressure control system; the computer equalizing pressure control system issues instructions according to the operating program, and controls the one equalizing pressure valve, the two equalizing pressure valves, the pressure relief valve, the upper tight valve, and the lower tight valve to open or close through the control circuit to complete the loading and unloading process, or control the two-position five-way solenoid valve to complete the blockage clearing task.

[0019] Specifically, during the process of loading and unloading the material tank, the material tank pressure plays a vital role. In order to prevent the upper and lower seal valves from being unable to open due to pressure on one side, all of them are interlocked with the material tank pressure. The upper seal valve is allowed to open and close when the material tank pressure is zero, and the lower seal valve is allowed to open and close when the material tank pressure is equal to the furnace top pressure.

[0020] A method for automatically clearing and taking pressure of a blast furnace tank, specifically comprising the following steps: a computer pressure equalizing control system compares the tank pressure with the furnace top pressure or the atmospheric pressure respectively; under normal circumstances, when charging the tank, after the pressure relief valve is fully opened, the gas in the tank is discharged instantly, and the tank pressure detection signal instantly drops to zero, which is equal to the atmospheric pressure; at this time, an upper tight valve is allowed to open and close; when the upper tight valve is opened, the furnace charge in the hopper enters the tank through the upper tight valve; when unloading, the upper tight valve and the first relief valve and the second relief valve are closed, and pressure is started to be charged into the tank; when a pressure equalizing valve I, a pressure equalizing valve II or a pressure equalizing valve I, a pressure equalizing valve II are opened, the tank pressure instantly rises from zero to equal to the furnace top pressure; at this time, a lower tight valve is allowed to open and close; when the lower tight valve is opened, the furnace charge in the tank enters the furnace through the lower tight valve, and a unloading process is completed. When the dirty gas pressure taking device of the material tank is blocked, 10 seconds after the pressure relief valve is opened, the specific time can be set according to the actual measured time on site. When the material tank pressure still does not return to zero, or 10 seconds after the first or second equalizing pressure valve is opened, this time can be set according to the actual measured time on site. When the material tank pressure still cannot be equal to the furnace top pressure, the computer equalizing pressure control system automatically determines that the dirty gas pressure taking device of the material tank is blocked, and immediately sends a clearing signal to the automatic clearing device of the blast furnace material tank pressure. At this time, the two-position five-way solenoid valve is controlled by the computer equalizing pressure control system to alternately supply gas to both ends of the cylinder. Each time the gas is alternately supplied, the cylinder piston drives the piston rod and the clearing probe to move back and forth once, automatically completing the cleaning and dredging of the dust accumulated at the bottom of the dirty gas pressure taking pipe, so as to ensure the smooth flow of the dirty gas pressure taking device of the material tank, and improve the accuracy and reliability of the material tank pressure measurement parameters. This method ultimately realizes the automatic and continuous loading and unloading process of the material tank, improves the automation control capability, and realizes the continuous production of the blast furnace.

[0021] Specifically, since the pressure taking and purging pipeline of the material tank is equipped with a constant flow purging device, when the dirty gas pressure taking device of the material tank is blocked, the pressure of the material tank will not return to zero after the pressure relief valve is opened, causing the upper sealing valve to fail to operate, resulting in an inability to load material, or after the equalizing pressure valve is opened, the pressure of the material tank cannot instantly reach the same level as the furnace top pressure, causing the lower sealing valve to fail to operate, resulting in an inability to unload material. At this time, human intervention is required to use manual loading, which affects the loading speed of the blast furnace. At the same time, the dirty gas pressure taking device of the material tank must be cleared in time.

[0022] The technical solution provided by the present invention, by adding a pneumatic clearing device and a computer pressure equalizing control system, according to the actual situation on site, sets the pressure relief valve to be fully opened for 10 seconds, and the pressure in the material tank still does not return to zero. At this time, the computer automatically sends a clearing signal to control the two-position five-way solenoid valve of the automatic clearing pressure device of the blast furnace material tank pressure to open, and supplies air to the cylinder to push the cylinder piston and the piston rod to drive the clearing probe to automatically clean the accumulated dust at the bottom of the dirty gas pressure taking device, so as to ensure the smooth flow of the dirty gas pressure taking device, and finally realize the automatic and continuous loading and unloading process of the material tank, and realize the continuous production of the blast furnace.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention overcomes the adverse conditions such as dust in the material tank, avoids frequent blockage of the bottom of the dirty gas pressure-taking device in the material tank, and affects the occurrence of normal production failures of the blast furnace; completely eliminates the high difficulty of the work, high labor intensity, and easy safety hazards of gas poisoning in the dirty gas pressure-taking device of the material tank that relies on manual gas cleaning; eliminates the untimely fault handling caused by delayed manual cleaning, which affects the occurrence of normal charging failures in the blast furnace; this device also considers a backup plan. When the solenoid valve and the cylinder fail, they can still be manually cleaned by opening the manual clearing ball valve, retaining the function of the original dirty gas pressure-taking device of the material tank;

[0025] (2) The present invention fully realizes the automatic clearing function of the dirty gas pressure taking device of the material tank, realizes the automatic and continuous loading and unloading process of the material tank, improves the automation control capability, realizes the continuous production of the blast furnace, and achieves the purpose of maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a blast furnace material tank pressure automatic clearing and pressure taking device of the present invention;

[0027] Figure 2 It is a schematic diagram of automatic control of a device and method for automatically clearing and taking pressure from a blast furnace tank according to the present invention;

[0028] The markings in the figure are: 1-cylinder piston, 2-cylinder, 3-piston rod, 4-bolt, 5-clearing probe, 6-first gas nozzle, 7-second gas nozzle, 8-two-position five-way solenoid valve, 9-pressure reducing filter, 10-dirty gas pressure taking pipe, 11-dirty gas pressure taking short pipe, 12-pressure taking conduit, 13-manual clearing ball valve, 14-pressure taking ball valve, 15-sealing pad, 16-first gas pipe, 17-second gas pipe, 18-uniform pressure charging valve I, 18A-first equalizing pressure-charging valve II, 19-second equalizing pressure-charging valve I, 19A-second equalizing pressure-charging valve II, 20-first pressure relief valve, 20A-second pressure relief valve, 21-constant flow purge device, 22-tank pressure, 23-computer equalizing pressure control system, 24-pressure taking and purge pipeline, 25-upper tight valve, 26-lower tight valve, 27-furnace top pressure, 28-tank charging and pressure relief pipeline, 29-blast furnace tank pressure automatic clearing device, 30-control circuit. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0030] As attached Figure 1 , Attachment Figure 2 As shown, a device and method for automatically clearing and taking pressure from a blast furnace material tank is disclosed. The device specifically includes a dirty gas pressure taking device, a pneumatic clearing device, a pressure taking and blowing device, and a computer pressure equalizing control system.

[0031] The dirty gas pressure taking device comprises a dirty gas pressure taking pipe 10, a dirty gas pressure taking short pipe 11, a manual clearing ball valve 13, a pressure taking conduit 12 and a pressure taking ball valve 14; a manual clearing ball valve 13 is installed at one end of the dirty gas pressure taking short pipe 11, and the other end is welded obliquely on the dirty gas pressure taking pipe 10, and the center lines of the dirty gas pressure taking short pipe 11 and the dirty gas pressure taking pipe 10 intersect at point A, so that when the manual clearing ball valve 13 is opened, the accumulated dust at the bottom of the dirty gas pressure taking pipe 10 can be manually cleaned; one end of the pressure taking conduit 12 is welded to the dirty gas pressure taking short pipe 11, and a pressure taking ball valve 14 is installed at the other end, and the pressure taking ball valve 14 is mainly used to connect the pressure taking and purge pipeline 24.

[0032] The pneumatic clearing device comprises a cylinder 2, a cylinder piston 1, a piston rod 3, a clearing probe 5, a two-position five-way solenoid valve 8, a first air nozzle 6, a second air nozzle 7, a first air pipe 16, a second air pipe 17, and a pressure reducing filter 9; the first air nozzle 6 and the second air nozzle 7 are arranged at both ends of one side of the cylinder 2, the outlet A and B ends of the two-position five-way solenoid valve 8 are connected to the first air nozzle 6 and the second air nozzle 7 through the first air pipe 16 and the second air pipe 17 respectively, the inlet P end of the two-position five-way solenoid valve 8 is connected to the outlet end of the pressure reducing filter 9, and the inlet end of the pressure reducing filter 9 is connected to the nitrogen source. One end of the piston rod 3 is connected to the cylinder piston 1, and the other end is connected to the clearing probe 5. The piston rod 3 is sealed with the top of the cylinder 2, so that the gas in the cylinder 2 is not connected to the gas in the dirty gas pressure taking pipe 10. The main function of the pressure reducing filter 9 is to provide pure gas with pressure meeting the requirements for the two-position five-way solenoid valve 8 and the cylinder 2. The two-position five-way solenoid valve 8 is connected to the cylinder 2 through the first air pipe 16, the second air pipe 17, the first air nozzle 6, and the second air nozzle 7, so as to realize the conversion from electric control to pneumatic control to drive the cylinder piston 1, the piston rod 3, and the clearing probe 5 to move, thereby completing the clearing task.

[0033] The clearing probe 5 is composed of four stainless steel chisels welded around the disc, with a hole in the middle of the disc for clamping and connecting with the piston rod 3 nut. On the one hand, the clearing probe 5 is conducive to conducting gas and preventing sparks from friction with the dirty gas pressure taking pipe 10. On the other hand, in order to prevent the electromagnetic valve and cylinder from failing, when the clearing probe 5 is at the bottom of the dirty gas pressure taking device, the cleaning tool can still pass through the gap between the four chisels to reach the bottom of the dirty gas pressure taking device through the opened manual clearing ball valve 13 to perform manual clearing.

[0034] One end of the dirty gas pressure taking pipe 10 in the dirty gas pressure taking device is connected to the pneumatic blockage clearing device through a bolt 4, and the connection part is sealed with a sealing gasket 15. The other end of the dirty gas pressure taking pipe 10 is welded to the tank filling and relief pipe 28 to ensure that the pressurized gas in the dirty gas pressure taking device does not leak. The combination of the two constitutes an automatic blockage clearing and pressure taking device 29.

[0035] The pressure-taking and purging device includes a material tank pressure 22, a constant-current purging device 21, and a pressure-taking and purging pipeline 24; the inlet end of the constant-current purging device 21 is connected to the instrument nitrogen, and the outlet is respectively connected to the material tank pressure 22 and the pressure-taking ball valve 14 through the pressure-taking and purging pipeline 24. The constant-current purging device 21 can continuously blow nitrogen into the dirty gas pressure-taking pipe 10 at a constant flow rate to prevent dust accumulation in the pressure-taking and purging pipeline 24 and the dirty gas pressure-taking pipe 10, and at the same time, the material tank pressure 22 detects the pressure parameters in the pressure-taking and purging pipeline 24 in real time.

[0036] The computer pressure equalizing control system 23 is connected to the two-position five-way solenoid valve 8, the first pressure equalizing valve, the second pressure equalizing valve, the pressure relief valve, the furnace top pressure 27, the material tank pressure 22, the upper tight valve 25, and the lower tight valve 26 through the control line 30. The first pressure equalizing valve, the second pressure equalizing valve and the pressure relief valve each have two sets, namely, the first pressure equalizing valve Ⅰ18, the first pressure equalizing valve Ⅱ18A, the second pressure equalizing valve Ⅰ19, the second pressure equalizing valve Ⅱ19A, the first pressure relief valve 20, and the second pressure relief valve 20A, which are mainly used for charging and relieving pressure in the material tank. Under normal circumstances, there are two sets of one for backup and one for use. The first pressure equalizing valve Ⅰ18 and the first pressure equalizing valve Ⅱ18A are mainly used to charge the material tank with blast furnace semi-clean coal gas, and the second pressure equalizing valve Ⅰ19 and the second pressure equalizing valve Ⅱ19A are mainly used to charge the material tank with pressurized coal gas or The main function of nitrogen is to serve as a backup or supplementary pressure for an equalizing pressure valve Ⅰ18 and an equalizing pressure valve Ⅱ18A. The first pressure relief valve 20 and the second pressure relief valve 20A are mainly used to discharge the gas in the material tank; the main function of the furnace top pressure 27 and the material tank pressure 22 is to input the respective detected pressure signals into the computer pressure equalizing control system 23; the computer pressure equalizing control system 23 issues instructions according to the operating program, and controls the opening or closing of an equalizing pressure valve Ⅰ18, an equalizing pressure valve Ⅱ18A, a second equalizing pressure valve Ⅰ19, a second equalizing pressure valve Ⅱ19A, the first pressure relief valve 20, the second pressure relief valve 20A, the upper tight valve 25, and the lower tight valve 26 through the control line 30 to complete the loading and unloading process, or control the two-position five-way solenoid valve 8 to complete the blockage clearing task.

[0037] A method for automatically clearing and taking pressure of a blast furnace tank, specifically as follows: a computer pressure equalization control system 23 compares the tank pressure 22 with the furnace top pressure 27 or the atmospheric pressure. Under normal circumstances, when charging the tank, after the first pressure relief valve 20 and the second pressure relief valve 20A are fully opened, the gas in the tank is discharged instantly, and the tank pressure 22 detection signal instantly drops to zero, which is equal to the atmospheric pressure. At this time, the upper sealing valve 25 is allowed to open and close. When the upper sealing valve 25 is opened, the furnace charge in the hopper passes through The upper tight valve 25 enters the material tank; when unloading, close the upper tight valve 25 and the first relief valve and the second relief valve, and start to pressurize the material tank. When the first equalizing pressure valve Ⅰ18, the first equalizing pressure valve Ⅱ18A or the second equalizing pressure valve Ⅰ19, the second equalizing pressure valve Ⅱ19A is opened, the material tank pressure 22 instantly rises from zero to equal to the furnace top pressure 27. At this time, the lower tight valve 26 is allowed to open and close. After the lower tight valve 26 is opened, the furnace charge in the material tank passes through the lower tight valve 26 into the furnace, completing a unloading process. When the dirty gas pressure-taking device of the material tank is blocked, 10 seconds after the first pressure relief valve 20, 20A is opened, the specific time can be set according to the on-site measured time, and the material tank pressure 22 still does not return to zero, or 10 seconds after the first pressure-equalizing charging valve Ⅰ18, the first pressure-equalizing charging valve Ⅱ18A or the second pressure-equalizing charging valve Ⅰ19, the second pressure-equalizing charging valve Ⅱ19A is opened, this time can be set according to the on-site measured time, and the material tank pressure 22 still cannot be equal to the furnace top pressure 27, at this time, the computer pressure-equalizing control system 23 automatically determines that the dirty gas pressure-taking device of the material tank is blocked, and immediately pressurizes the blast furnace material tank. The automatic clearing device 29 sends a clearing signal. At this time, the two-position five-way solenoid valve 8 is controlled by the computer pressure equalizing control system 23 to supply gas alternately to the two ends of the cylinder 2. Each time the gas is alternately supplied, the cylinder piston 1 drives the piston rod 3 and the clearing probe 5 to move back and forth once, and automatically completes the cleaning and dredging of the dust accumulated at the bottom of the dirty gas pressure taking pipe 10, so as to ensure the smooth flow of the dirty gas pressure taking device of the material tank, improve the accuracy and reliability of the measurement parameters of the material tank pressure 22, and finally realize the automatic and continuous loading and unloading process of the material tank, improve the automation control capability, and realize the continuous production of the blast furnace.

[0038] During the process of loading and unloading the material tank, the material tank pressure 22 plays a vital role. In order to prevent the upper and lower sealing valves 25 and 26 from being unable to open due to pressure on one side, they are all interlocked with the material tank pressure 22. The upper sealing valve 25 is allowed to open and close only when the material tank pressure 22 is zero, and the lower sealing valve 26 is allowed to open and close only when the material tank pressure 22 is equal to the furnace top pressure 27. Since the material tank pressure 22 pressure-taking purge pipeline 24 has a constant flow purge device 21, when the material tank dirty gas pressure-taking device is blocked, When it is blocked, after the pressure relief valve is opened, the tank pressure 22 will not return to zero, causing the upper sealing valve 25 to be unable to operate, resulting in the inability to load materials, or after the equalizing pressure charging valve Ⅰ18 and the equalizing pressure charging valve Ⅱ18A are opened, the tank pressure 22 cannot instantly reach the same level as the furnace top pressure 27, causing the lower sealing valve 26 to be unable to operate, resulting in the inability to unload materials. At this time, human intervention is required to use manual loading, which affects the loading speed of the blast furnace. At the same time, the dirty gas pressure taking device of the tank must be cleared in time.

[0039] The technical solution of the present invention is to add a pneumatic clearing device and a computer pressure equalizing control system. According to the actual situation on site, after the pressure relief valve is fully opened for 10 seconds, the tank pressure 22 still does not return to zero. At this time, the computer automatically sends a clearing signal to control the two-position five-way solenoid valve 8 of the automatic clearing pressure device of the blast furnace tank pressure to open, and supply air to the cylinder 2 to push the cylinder piston 1 and the piston rod 3 to drive the clearing probe 5 to automatically clean the accumulated dust at the bottom of the dirty gas pressure taking device to ensure the smooth flow of the dirty gas pressure taking device, and finally realize the automatic and continuous loading and unloading process of the tank, and realize the continuous production of the blast furnace.

[0040] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A method for automatically clearing and taking pressure from a blast furnace tank, comprising an automatic clearing and taking pressure device, characterized in that: The specific steps are as follows: The loading and unloading process is as follows: 1) The computer pressure equalization control system (23) compares the tank pressure (22) with the furnace top pressure (27) or the atmospheric pressure. Under normal circumstances, when charging the tank, after the first pressure relief valve (20) and the second pressure relief valve (20A) are fully opened, the gas in the tank is discharged instantly, and the tank pressure (22) detection signal drops to zero instantly, which is equal to the atmospheric pressure. At this time, the upper sealing valve (25) is allowed to open and close. When the upper sealing valve (25) is opened, the furnace charge in the hopper passes through the upper sealing valve (25) and enters the tank; 2) When unloading, close the upper sealing valve (25) and the first relief valve and the second relief valve, and start to pressurize the material tank. When the first pressure equalizing valve I (18), the first pressure equalizing valve II (18A) or the second pressure equalizing valve I (19), the second pressure equalizing valve II (19A) is opened, the material tank pressure (22) rises from zero to the same as the furnace top pressure (27) instantly. At this time, the lower sealing valve (26) is allowed to open and close. After the lower sealing valve (26) is opened, the furnace charge in the material tank passes through the lower sealing valve (26) and enters the furnace, completing a unloading process; The process of dealing with the blockage of the dirty gas pressure taking device of the material tank is as follows: When the dirty gas pressure taking device of the material tank is blocked, the material tank pressure (22) still does not return to zero after the first pressure relief valve (20) and the second pressure relief valve (20A) are opened for 10 seconds, or the material tank pressure (22) still cannot be equalized to the furnace top pressure (27) after the first pressure equalization valve I (18) and the first pressure equalization valve II (18A) or the second pressure equalization valve I (19) and the second pressure equalization valve II (19A) are opened for 10 seconds, the computer pressure equalization control system (23) automatically determines that the dirty gas pressure taking device of the material tank is blocked. , immediately sends a clearing signal to the automatic clearing device (29) for the blast furnace tank pressure. At this time, the two-position five-way solenoid valve (8) is controlled by the computer pressure equalization control system (23) to alternately supply gas to both ends of the cylinder (2). Each time the gas is alternately supplied, the cylinder piston (1) drives the piston rod (3) and the clearing probe (5) to move back and forth once, automatically completing the cleaning and dredging of the dust accumulated at the bottom of the dirty gas pressure taking pipe (10), so as to ensure the smooth flow of the dirty gas pressure taking device of the tank, and improve the accuracy and reliability of the measurement parameters of the tank pressure (22); The automatic clearing and pressure-taking device comprises a dirty gas pressure-taking device, a pneumatic clearing and pressure-taking device, a pressure-taking and purging device, and a computer pressure-equalizing control system (23). The pneumatic clearing and pressure-taking device is connected to the dirty gas pressure-taking device via a bolt (4), and the connection portion is sealed with a sealing gasket (15). The pressure-taking and purging device comprises a tank pressure (22), a constant-current purging device (21), and a pressure-taking and purging pipeline (24). The inlet end of the constant-current purging device (21) is connected to instrument nitrogen, and the outlet is respectively connected to the tank pressure (22) and the pressure-taking ball valve (14) via the pressure-taking and purging pipeline (24). The computer pressure-equalizing control system (23) is respectively connected to each of the devices via a control line (30).

2. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 1, characterized in that: The dirty gas pressure taking device further comprises a dirty gas pressure taking pipe (10), a dirty gas pressure taking short pipe (11), a manual clearing ball valve (13), and a pressure taking conduit (12); one end of the dirty gas pressure taking short pipe (11) is equipped with a manual clearing ball valve (13), and the other end is welded obliquely to the dirty gas pressure taking pipe (10); the center lines of the dirty gas pressure taking short pipe (11) and the dirty gas pressure taking pipe (10) intersect at point A; one end of the dirty gas pressure taking pipe (10) is connected to the pneumatic clearing device via a bolt (4), and the other end is welded to the tank charging and releasing pressure pipe (28); one end of the pressure taking conduit (12) is welded to the dirty gas pressure taking short pipe (11), and the other end is equipped with a pressure taking ball valve (14).

3. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 2, characterized in that: One end of the dirty gas pressure taking pipe (10) in the dirty gas pressure taking device is connected to the pneumatic clearing device via a bolt (4), the connection portion is sealed with a sealing gasket (15), and the other end of the dirty gas pressure taking pipe (10) is welded to the tank charging and releasing pressure pipe (28).

4. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 1, characterized in that: The pneumatic blockage clearing device comprises a cylinder (2), a cylinder piston (1), a piston rod (3), a blockage clearing probe (5), a two-position five-way solenoid valve (8), a first air nozzle (6), a second air nozzle (7), a first air pipe (16), a second air pipe (17), and a pressure reducing filter (9). One end of the piston rod (3) is fixed to the cylinder piston (1), and the other end is fixed to the blockage clearing probe (5). The piston rod (3) is sealed with the top of the cylinder (2). The first air nozzle (6) and the second air nozzle (7) are arranged at two ends of one side of the cylinder (2). The outlets A and B of the two-position five-way solenoid valve (8) are connected to the first air nozzle (6) and the second air nozzle (7) through the first air pipe (16) and the second air pipe (17), respectively.

5. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 4, characterized in that: The blockage clearing probe (5) is composed of four stainless steel chisels welded on the periphery of a disc. A hole is opened in the middle of the disc and is clamped and connected to the piston rod (3) with a nut.

6. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 1, characterized in that: The computer pressure equalizing control system (23) is respectively connected to a two-position five-way solenoid valve (8), two sets of one-pressure equalizing valves, two sets of two-pressure equalizing valves, two sets of pressure relief valves, furnace top pressure (27), material tank pressure (22), an upper sealing valve (25), and a lower sealing valve (26) through a control line (30).

7. A method for automatically clearing and taking pressure from a blast furnace tank according to claim 6, characterized in that: The two sets of one equalizing pressure-charging valves are respectively one equalizing pressure-charging valve I (18) and one equalizing pressure-charging valve II (18A); the two sets of two equalizing pressure-charging valves are respectively two equalizing pressure-charging valves I (19) and two equalizing pressure-charging valves II (19A); and the two sets of pressure relief valves are respectively a first pressure relief valve (20) and a second pressure relief valve (20A).

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