Hydraulic control system and method for valve of hot blast stove and blast furnace air supply system

Abstract

The invention discloses a hot blast stove valve hydraulic control system and method and a blast furnace air supply system. The technical problems that in the prior art, a blast furnace hydraulic control system is short in service life, and energy waste is likely to be caused are solved. The hot blast stove valve hydraulic control system comprises a main oil supply device, a high-pressure energy accumulator set device, a low-pressure energy accumulator set device and a hydraulic cylinder. The working pressure of the high-pressure energy accumulator set device is larger than that of the low-pressure energy accumulator set device. The number of the hydraulic cylinders is the same as that of valves of the hot blast stove, the telescopic end of each hydraulic cylinder is connected to the corresponding valve so that the corresponding valve can be opened or closed, and rodless cavities of the hydraulic cylinders can be communicated with at least one of the main oil supply device, the high-pressure energy accumulator set device and the low-pressure energy accumulator set device in a switchable mode. And a rod cavity of the hydraulic cylinder is communicated with the main oil supply device. And a relatively energy-saving mode can be selected according to the characteristics of the valves in the blast furnace to control the opening and closing of the related valves through the hydraulic system, so that the aim of saving energy is fulfilled.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnaces, and specifically relates to a hot blast furnace valve hydraulic control system and control method, and a blast furnace air supply system. Background Art

[0002] The large-scale development of blast furnaces is a manifestation of the improvement of the current technical level of ironmaking equipment and an inevitable trend. In recent years, Shougang has quickly achieved large-scale blast furnaces through new construction during the relocation process. The large-scale blast furnace has put forward new requirements for blast furnace equipment. It must develop in the direction of large-scale, intelligent and environmentally friendly to meet the production requirements of large blast furnaces.

[0003] The existing blast furnace hydraulic control system has some obvious defects. The system design includes multiple accumulator groups, requiring the hydraulic main pump to run continuously around the clock to supply oil, which not only increases the wear of the hydraulic pump and motor, shortens their service life, but also leads to energy waste. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a hot blast furnace valve hydraulic control system and control method, and a blast furnace air supply system.

[0005] The technical solution adopted to achieve the purpose of this application is a hot blast furnace valve hydraulic control system, comprising:

[0006] A main oil supply device, used for providing and storing hydraulic oil;

[0007] A high-pressure accumulator group device and a low-pressure accumulator group device, wherein the working pressure of the high-pressure accumulator group device is greater than that of the low-pressure accumulator group device;

[0008] The hydraulic cylinder has the same number as the valves of the hot blast furnace, and the telescopic end of each hydraulic cylinder is connected to the corresponding valve to open or close the corresponding valve. The rodless chamber of the hydraulic cylinder can be switchably connected to at least one of the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device, and the rod chamber of the hydraulic cylinder is connected to the main oil supply device.

[0009] In some implementations, the working pressure of the high-pressure accumulator group device is 10-15 MPa; the working pressure of the low-pressure accumulator group device is 7-15 MPa.

[0010] In some embodiments, the high-pressure accumulator group device and the low-pressure accumulator group device each include a plurality of accumulator groups, one or more pressure relays, a control valve assembly, and a hydraulically controlled one-way valve;

[0011] The accumulator group is connected to the hydraulic cylinder through a pipeline, and the one or more pressure relays, the control valve assembly and the hydraulically controlled one-way valve are arranged on the pipeline.

[0012] In some embodiments, the main oil supply device includes an oil tank and a first branch and a second branch connected to the oil tank, the first branch includes a shut-off valve, a main pump and a main oil supply filter connected in sequence, the main oil supply filter is connected to the high-pressure accumulator group device and / or the low-pressure accumulator group device and / or the hydraulic cylinder; the second branch includes a return oil filter and a return oil check valve connected in sequence, the return oil filter is connected to the hydraulic cylinder.

[0013] In some embodiments, the hot blast furnace valve hydraulic control system further includes a pressure relief device, which includes a pressure relief pipeline connected to the main oil supply filter and a throttle valve, a two-position three-way solenoid valve and a relief valve arranged on the pressure relief pipeline.

[0014] In some embodiments, one of the valves of the hot blast stove is a flow regulating valve;

[0015] The hot blast stove valve hydraulic control system comprises a reversing valve, a pilot valve and an opening sensor for detecting the opening of the flow regulating valve;

[0016] The controller, the opening sensor, the reversing valve and the pilot valve are all electrically connected to the controller.

[0017] A second aspect of the present application provides a blast furnace air supply system, comprising:

[0018] Hot blast furnace, equipped with more than one valve;

[0019] In the above hydraulic system, the telescopic end of each hydraulic cylinder is connected to the valve corresponding to the hot blast furnace to open or close the corresponding valve.

[0020] In some embodiments, the one or more valves also include a hot air valve connected to the blast furnace through a pipeline, a cold air valve connected to the cold air through a pipeline, a waste air valve for pressure relief, a pressure equalizing valve for pressure equalization, and a smoke sampling valve for detection.

[0021] The third aspect of the present application provides a hot blast furnace valve hydraulic control method, which is applicable to the above-mentioned blast furnace air supply system, comprising the following steps:

[0022] Get the number of hot air furnace valves to be opened or closed;

[0023] When the number of valves is less than 5, the high-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed; when the number of valves is more than 5, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed.

[0024] In some embodiments, when the number of the valves is more than 5, controlling the low-pressure accumulator group device to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed so as to open or close the hot blast stove valve to be opened or closed specifically includes:

[0025] When the number of the valves is 5 to 10, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast furnace valve to be opened or closed, so that the hot blast furnace valve to be opened or closed is opened or closed;

[0026] When the number of the valves is 10 to 15, the low-pressure accumulator group device and / or the high-pressure accumulator group device are controlled to supply oil to the hydraulic cylinder corresponding to the hot blast furnace valve to be opened or closed, so that the hot blast furnace valve to be opened or closed is opened or closed;

[0027] When the number of valves is 15 or more, the low-pressure accumulator group device and / or the high-pressure accumulator group device and / or the main oil supply device are controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed.

[0028] It can be seen from the above technical scheme that the present application provides a hot blast furnace valve hydraulic control system and control method, and a blast furnace air supply system. The hot blast furnace valve hydraulic control system includes a main oil supply device, a high-pressure accumulator group device, a low-pressure accumulator group device and a hydraulic cylinder. The main oil supply device is used to provide stored hydraulic oil; a high-pressure accumulator group device and a low-pressure accumulator group device, the working pressure of the high-pressure accumulator group device is greater than that of the low-pressure accumulator group device; a hydraulic cylinder, the number of which is the same as the number of valves of the hot blast furnace, the telescopic end of each hydraulic cylinder is connected to the corresponding valve to open or close the corresponding valve, the rodless chamber of the hydraulic cylinder can be switchably connected to at least one of the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device, and the rod chamber of the hydraulic cylinder is connected to the main oil supply device. The hydraulic cylinder is supplied with oil through the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device. The main oil supply device can store the hydraulic oil in the high-pressure accumulator group device and the low-pressure accumulator group device to ensure the oil supply of the high-pressure accumulator group device and the low-pressure accumulator group device to the hydraulic equipment. According to the characteristics of the valves in the blast furnace, a more energy-saving method can be selected to control the opening and closing of related valves through the hydraulic system, thereby achieving the purpose of energy saving.

[0029] The hot blast furnace valve hydraulic control system can control the opening or closing of the hot blast furnace valve. It uses high-pressure accumulator group devices and low-pressure accumulator group devices to provide daily power for the hot blast furnace valve. The high-pressure accumulator group device provides power for heavier equipment valves, such as hot blast valves and cold blast valves; the low-pressure accumulator group device can provide power for lighter equipment valves, thereby avoiding energy waste. By using multiple accumulator groups to control the opening or closing of the hot blast furnace valve, the energy-saving operation of the hydraulic control system is guaranteed and the service life of the hydraulic control system is increased. It is suitable for various blast furnace hot blast furnace hydraulic systems. Especially in ensuring the service life and stable operation of the blast furnace hydraulic system, it has a good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the hot blast furnace valve hydraulic control system in the embodiment of the present application.

[0031] Figure 2 This is a schematic diagram of the blast furnace air supply system in an embodiment of the present application.

[0032] Description of the accompanying drawings: 100-hot blast furnace valve hydraulic control system, 110-oil tank, 111-gate, 112-main pump, 113-main oil supply filter, 114-return oil filter, 115-return oil check valve, 116-oil supply check valve, 120-high-pressure accumulator group, 121-first pressure relay, 122-first hydraulically controlled check valve, 123-second pressure relay, 124-first throttle valve, 125-first two-position two-way solenoid valve, 130-low-pressure accumulator group, 131-third pressure relay, 132-second hydraulically controlled check valve, 133-fourth pressure relay, 134-second throttle valve, 135-second two-position two-way solenoid valve, 140-hydraulic cylinder, 141-three-position four-way solenoid reversing valve, 142-hydraulic lock, 143 - one-way throttle valve, 144- high-pressure ball valve, 145- reversing valve, 146- pilot valve, 150- third throttle valve, 151- two-position three-way solenoid valve, 152- overflow valve; 200- blast furnace air supply system, 210- hot blast furnace, 211- hot blast valve, 212- cold blast valve, 213- waste air valve, 214- equalizing pressure valve, 215- smoke extraction valve, 216- first flue valve, 217- gas cut-off valve, 218- gas release valve, 219- gas combustion valve, 220- air combustion valve, 221- second flue valve, 222- air mixing valve, 223- air mixing regulating valve, 224- vent valve, 225- gas inlet regulating valve, 226- gas outlet regulating valve, 227- gas branch pipe regulating valve, 228- preheating furnace, 229- air shut-off valve. DETAILED DESCRIPTION

[0033] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0034] In the prior art, taking three hot blast furnaces as an example, there are about 190 hydraulic control circuits with valves controlled by oil cylinders in the three hot blast furnaces, and these valves are usually automatically controlled; the furnace top charging equipment is controlled by a fully automatic hydraulic system, and there are about 50 hydraulic control circuits with valves controlled by oil cylinders. Hot blast furnaces and furnace top hydraulic control systems are usually equipped with multiple accumulator groups, and the hydraulic main pump runs continuously for 24 hours to supply oil. When the blast furnace system valve needs to be actuated, the pressure oil of the main pump and the accumulator group is used to drive the valve to actuate. The long-term operation of the hydraulic main pump not only causes wear of the hydraulic pump and motor, reducing their lifespan, but also leads to waste of electric energy. The hydraulic system supplies oil to the reversing valve for a long time, making it difficult to judge various hydraulic faults.

[0035] In the embodiments of the present application, as shown in the attached Figure 1 As shown, a hot blast stove valve hydraulic control system, the hot blast stove 210 valve hydraulic control system 100 includes a main oil supply device, a high-pressure accumulator group device, a low-pressure accumulator group device and a hydraulic cylinder 140, the main oil supply device is used to provide stored hydraulic oil; the working pressure of the high-pressure accumulator group device is greater than that of the low-pressure accumulator group device; the hydraulic cylinder 140 has the same number of valves as the hot blast stove 210, and the telescopic end of each hydraulic cylinder 140 is connected to the corresponding valve to open or close the corresponding valve, the rodless chamber of the hydraulic cylinder 140 can be switchably connected to at least one of the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device, and the rod chamber of the hydraulic cylinder 140 is connected to the main oil supply device.

[0036] The main oil supply device is used to press the high-pressure accumulator group device, press the low-pressure accumulator group device, and supply oil to the hydraulic cylinder 140. That is, when the pressure of the high-pressure accumulator group device and the pressure of the low-pressure accumulator group device are low, the main oil supply device can press and supply oil to the high-pressure accumulator group device and the low-pressure accumulator group device, so that the pressure of the high-pressure accumulator group device and the pressure of the low-pressure accumulator group device are restored to the working pressure. Under certain circumstances, the high-pressure accumulator group device and the low-pressure accumulator group device can supply oil to the hydraulic cylinder 140 to meet the work of the hydraulic cylinder 140, thereby opening the corresponding valve. In addition, the main oil supply device can also directly supply oil to the hydraulic cylinder 140 to meet the work of the hydraulic cylinder 140, thereby opening the corresponding valve.

[0037] The working pressure of the high-pressure accumulator group 120 is greater than the working pressure of the low-pressure accumulator group 130. In some embodiments, the high-pressure accumulator group 120 can provide pressure for heavier equipment, such as providing power for the hot air valve 211 and the cold air valve 212, and can open or close the valves of heavier equipment; the low-pressure accumulator group 130 can provide pressure for lighter equipment, and can open or close the valves of lighter equipment. Therefore, a suitable accumulator group can be selected to provide working pressure according to the opening or closing of the valve, thereby ensuring the stable operation of the hydraulic system.

[0038] The hydraulic cylinder 140 has the same number of valves as the hot blast stove 210, so that each hydraulic cylinder 140 can open or close the valve of the corresponding hot blast stove 210. The rodless chamber of the hydraulic cylinder 140 can be switchably connected to the oil supply end of the hydraulic cylinder 140 of at least one of the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device. That is, the oil supply end of the hydraulic cylinder 140 can be supplied with oil through the main oil supply device, the high-pressure accumulator group device, or the low-pressure accumulator group device, which can ensure the stable operation of the hydraulic system in different situations, thereby ensuring that the valve of the hot blast stove 210 is normally opened or closed.

[0039] The piston rod will extend from the cylinder barrel by filling the rodless chamber of the hydraulic cylinder 140 with oil and returning oil to the rod chamber of the hydraulic cylinder 140. If hydraulic oil is introduced into the rod chamber and the rodless chamber returns oil, the piston rod will retract into the cylinder barrel.

[0040] Therefore, the hot blast furnace 210 valve hydraulic control system 100 can control the opening or closing of the valve of the hot blast furnace 210, and adopts a high-pressure accumulator group device and a low-pressure accumulator group device to provide daily power for the valve of the hot blast furnace 210. The high-pressure accumulator group device provides power for heavier equipment valves, such as hot air valve 211 and cold air valve 212; the low-pressure accumulator group device can provide power for lighter equipment valves, thereby avoiding energy waste. By adopting multiple groups of accumulator groups to control the opening or closing of the valve of the hot blast furnace 210, the energy-saving operation of the hydraulic control system is guaranteed, and the service life of the hydraulic control system is improved. It is suitable for various types of blast furnace hot blast furnace 210 hydraulic systems. In particular, it has a good effect in ensuring the service life and stable operation of the blast furnace hydraulic system.

[0041] In some embodiments, the working pressure of the high-pressure accumulator group device is 10-15 MPa, which can provide pressure for heavier equipment, such as providing power for the hot air valve 211 and the cold air valve 212; the working pressure of the low-pressure accumulator group device is 7-15 MPa, which can provide pressure for lighter equipment.

[0042] In some embodiments, the high-pressure accumulator group device and the low-pressure accumulator group device both include an accumulator group, one or more pressure relays, a control valve assembly and a hydraulically controlled one-way valve; the accumulator group is connected to the hydraulic cylinder 140 through a pipeline, and one or more pressure relays, a control valve assembly and a hydraulically controlled one-way valve are arranged on the pipeline.

[0043] In some embodiments, the accumulator group of the high-pressure accumulator group device includes a plurality of high-pressure accumulators, and the one or more pressure relays include two, one of which is used to detect the pressure of the high-pressure accumulator group device, and the other is used to detect the system pressure. The control valve assembly of the high-pressure accumulator group device includes a first throttle valve 124 and a first two-position two-way solenoid valve 125. The hydraulically controlled one-way valve of the high-pressure accumulator group device is recorded as the first hydraulically controlled one-way valve 122.

[0044] In some embodiments, the pressure relay included in the high-pressure accumulator group device is set to a first pressure relay 121 and a second pressure relay 123, wherein the first pressure relay 121 is used to detect the pressure of the high-pressure accumulator group device. If the pressure of the high-pressure accumulator group device is between 10 and 15 MPa, the first hydraulically controlled one-way valve 122 can be opened by electrically connecting the first two-position two-way solenoid valve 125 to realize the operation and stop of oil supply to the hydraulic cylinder 140.

[0045] In some embodiments, the accumulator group of the low-pressure accumulator group device includes a plurality of low-pressure accumulators, and the one or more pressure relays include two, one of which is used to detect the pressure of the low-pressure accumulator group device, and the other is used to detect the system pressure. The control valve assembly of the low-pressure accumulator group device includes a second throttle valve 134 and a second two-position two-way solenoid valve 135. The hydraulically controlled one-way valve of the low-pressure accumulator group device is recorded as the second hydraulically controlled one-way valve 132.

[0046] In other embodiments, the pressure relays included in the low-pressure accumulator group device are set to be a third pressure relay 131 and a fourth pressure relay 133, wherein the third pressure relay 131 is used to detect the pressure of the low-pressure accumulator group device. If the pressure of the low-pressure accumulator group 130 is between 7 and 15 MPa, the second hydraulically controlled one-way valve 132 can be opened by electrically connecting the second two-position two-way solenoid valve 135 to realize the operation and stop of oil supply to the hydraulic cylinder 140.

[0047] In some embodiments, the main oil supply device is connected to the hydraulic cylinder 140, the high-pressure accumulator group device and the low-pressure accumulator group device. The main oil supply device includes an oil tank 110 and a first branch and a second branch connected to the oil tank 110. The first branch includes a shut-off valve 111, a main pump 112 and a main oil supply filter 113 connected in sequence. The main oil supply filter 113 is connected to the high-pressure accumulator group device and / or the low-pressure accumulator group device and / or the hydraulic cylinder 140; that is, the oil tank 110 can be used to pressurize oil to supply to the high-pressure accumulator group device, pressurize oil to supply to the low-pressure accumulator group device or supply oil to the hydraulic cylinder 140.

[0048] In some embodiments, when the pressure of the high-pressure accumulator group device and the low-pressure accumulator group device does not reach the working pressure, oil can be supplied to the high-pressure accumulator group device and the low-pressure accumulator group device through the main oil supply device, so that the high-pressure accumulator group device and the low-pressure accumulator group device can meet the requirements for normal operation.

[0049] In some embodiments, when the pressure of the high-pressure accumulator group device detected by the first pressure relay 121 is lower than 10MPa, the main pump 112 can be controlled by the controller to supply oil to the high-pressure accumulator group device, that is, to pressurize the high-pressure accumulator group device. The main pump 112 can be controlled by the controller to start and pressurize the high-pressure accumulator group device. The specific process is that the main pump 112 pressurizes the oil supply path to the high-pressure accumulator group device: oil tank 110-gate 111-main pump 112-main oil supply filter 113-oil supply check valve 116-second pressure relay 123-first hydraulically controlled check valve 122-first pressure relay 121-high-pressure accumulator group 120.

[0050] In other embodiments, when the third pressure relay 131 detects that the pressure of the low-pressure accumulator group device is lower than 7MPa, the main pump 112 can be controlled by the controller to supply oil to the low-pressure accumulator group 130, that is, to pressurize the low-pressure accumulator group 130. The main pump 112 can be controlled by the controller to start and pressurize the low-pressure accumulator group 130. The specific process is that the main pump 112 pressurizes the oil supply path to the low-pressure accumulator group 130: oil tank 110-gate 111-main pump 112-main oil supply filter 113-oil supply check valve 116-fourth pressure relay 133-second hydraulically controlled check valve 132-third pressure relay 131-low-pressure accumulator group 130.

[0051] In other embodiments, the second branch includes an oil return filter 114 and an oil return check valve 115 which are connected in sequence, and the oil return filter 114 is connected to the hydraulic cylinder 140 .

[0052] In some embodiments, a three-position four-way electromagnetic reversing valve 141 , a hydraulic lock 142 and a high-pressure ball valve 144 are further provided on the pipeline connecting the main oil supply filter 113 and the hydraulic cylinder 140 .

[0053] In some embodiments, if the pressure of the high-pressure accumulator group 120 is between 10 and 15 MPa, the first hydraulically controlled one-way valve 122 can be opened by electrically connecting the first two-position two-way solenoid valve 125 to start and stop the oil supply to the hydraulic cylinder 140 .

[0054] The oil inlet circuit is: high-pressure accumulator group 120-first pressure relay 121-first throttle valve 124-first two-position two-way solenoid valve 125-first hydraulically controlled one-way valve 122-second pressure relay 123-three-position four-way solenoid reversing valve 141 (left position)-hydraulic lock 142-one-way throttle valve 143-high-pressure ball valve 144--single-rod double-acting hydraulic cylinder 140.

[0055] The oil return circuit is: single-rod double-acting hydraulic cylinder 140 - high-pressure ball valve 144 - one-way throttle valve 143 - hydraulic lock 142 - three-position four-way electromagnetic reversing valve 141 (left position) - return oil one-way valve 115 - return oil filter 114 - oil tank 110.

[0056] In some embodiments, if the pressure of the low-pressure accumulator group 130 is between 7 and 15 MPa, the second hydraulically controlled one-way valve 132 can be opened by electrically connecting the second two-position two-way solenoid valve 135 to supply oil to the three-position four-way solenoid reversing valve 141 and stop the operation.

[0057] The oil inlet circuit is: low-pressure accumulator group 130-third pressure relay 131-second throttle valve 134-second two-position two-way solenoid valve 135-second hydraulically controlled one-way valve 132-fourth pressure relay 133-three-position four-way solenoid reversing valve 141 (left position)-hydraulic lock 142-one-way throttle valve 143-high-pressure ball valve 144--single-rod double-acting hydraulic cylinder 140.

[0058] The oil return circuit is: single-rod double-acting hydraulic cylinder 140 - high-pressure ball valve 144 - one-way throttle valve 143 - hydraulic lock 142 - three-position four-way electromagnetic reversing valve 141 (left position) - return oil one-way valve 115 - return oil filter 114 - oil tank 110.

[0059] In some embodiments, if the pressures of the high-pressure accumulator group 120 and the low-pressure accumulator group 130 cannot meet the oil supply demand of the hydraulic cylinder 140 , the main oil supply device may directly supply oil to the hydraulic cylinder 140 .

[0060] Oil inlet circuit: oil tank 110 - shut-off valve 111 - main pump 112 - main oil supply filter 113 - oil supply check valve 116 - three-position four-way solenoid reversing valve 141 (left position) - hydraulic lock 142 - one-way throttle valve 143 - high-pressure ball valve 144 - single-rod double-acting hydraulic cylinder 140.

[0061] The oil return circuit is: single-rod double-acting hydraulic cylinder 140 - high-pressure ball valve 144 - one-way throttle valve 143 - hydraulic lock 142 - three-position four-way electromagnetic reversing valve 141 (left position) - return oil one-way valve 115 - return oil filter 114 - oil tank 110.

[0062] In some embodiments, the hot blast furnace 210 valve hydraulic control system 100 further includes a pressure relief device, which includes a pressure relief pipeline connected in parallel with the main oil supply filter 113 and a throttle valve, a two-position three-way solenoid valve 151 and a relief valve 152 arranged on the pressure relief pipeline. When the corresponding oil pressure signal received by the controller exceeds the starting pressure value, the pressure is relieved through the pressure relief device.

[0063] In some embodiments, when the hydraulic system pressure is higher than 15 MPa, the pressure relay 18 is electrically connected to the two-position three-way solenoid valve 20 to control the pressure relief circuit of the relief valve 152. Then the pressure relief sequence is: oil tank 110-shutoff valve 111-main pump 112-main oil supply filter 113-third throttle valve 150-two-position three-way solenoid valve 151-relief valve 152-oil tank 110.

[0064] Therefore, the hot blast furnace 210 valve hydraulic control system 100 can make full use of multiple groups of accumulators, for example, 4 to 6 groups, which are set according to the blast furnace hydraulic control circuit. The hot blast furnace 210 valve hydraulic control system 100 adopts three methods of high-pressure accumulator group 120, low-pressure accumulator group 130 and main oil supply device to supply oil to the hydraulic cylinder 140, which can provide power for the corresponding valve and avoid energy waste.

[0065] In addition, taking the high-pressure accumulator group 120 as an example, the high-pressure accumulator group 120 includes the high-pressure accumulator group 120, the first hydraulically controlled one-way valve 122, and the first two-position two-way solenoid valve 125 to form an oil supply circuit of the hydraulic valve. When the first two-position two-way solenoid valve 12516 receives a signal instruction and is powered on to open, the control oil will flow into the first hydraulically controlled one-way valve 122 to open it, and the pressure oil of the high-pressure accumulator group 120 is directly supplied to the single-rod double-acting hydraulic cylinder 140 for action; when the pressure of the accumulator group is lower than 10MPa, the main pump 112 is turned on, and the main pump 112 directly supplies the single-rod double-acting hydraulic cylinder 140. The double-acting hydraulic cylinder 140 provides pressure oil and charges the accumulator group 13 at the same time; when the first pressure relay 121 and the second pressure relay 123 simultaneously detect that the system pressure reaches 13MPa, the main pump 1123 is powered off and stops rotating; when the first pressure relay 121 detects that the system pressure exceeds 15MPa, a third throttle valve 150, a two-position three-way solenoid valve 151, and a relief valve 152 are set in the system to form an unloading circuit. At this time, when the main pump 112 is still running, the two-position three-way solenoid valve 151 is powered and the system pressure is relieved to zero. That is, the oil supply of the hydraulic cylinder 140 or the stamping of the accumulator group can be completed through the high-pressure accumulator group 120 and the oil supply circuit. When the system pressure of the high-pressure accumulator group 120 is too high, it can be relieved through the pressure relief circuit.

[0066] In some embodiments, one of the valves of the hot blast furnace 210 is a flow regulating valve; the hot blast furnace 210 valve hydraulic control system 100 includes a reversing valve 145, a pilot valve 146 and an opening sensor for detecting the opening of the flow regulating valve; the opening sensor, the reversing valve 145 and the pilot valve 146 are all electrically connected to the controller.

[0067] In some embodiments, when the air-diverting shut-off valve 229 is opened, the power supply can simultaneously realize a corresponding increase in the energy cold air volume to avoid fluctuations in wind pressure during the air supply process; after closing the air-diverting shut-off valve 229, the cold air equalizing valves 214 of the four hot air furnaces 210 can be used to equalize the pressure of the hot air furnace 210 that has finished supplying air, thereby effectively avoiding energy waste.

[0068] In some embodiments, the flow regulating valve can be a mixed air regulating valve 223. Taking four hot air furnaces 210 as an example, the four hot air furnaces 210 adopt a two-burning and two-sending method. The two hot air furnaces 210 supply air to ensure that the supply air temperature is 1220-1230°C. When the mixed air regulating valve 223 is closed to the lower limit of 20% in the late stage of air supply to meet the supply air temperature, the two hot air furnaces 210 that are supplying air can be stopped by electrical connection, and the mixed air regulating valve 223 can be closed at the same time; the cold air equalizing pressure valve 214 of the hot air furnace 210 that has stopped supplying air and the cold air equalizing pressure valve 214 of the hot air furnace 210 that is about to supply air are opened, and the hot air furnace 210 that is burning will be put into supplying air, and then the pressure will be balanced at 2 kg after about 5 minutes. Close the stopped cold air pressure-equalizing valve 214, release the remaining pressure, and then the hot air furnace 210 starts burning; open the air-displacing shut-off valve 229 simultaneously, and continue to equalize the pressure of the hot air furnace 210 that is about to supply air. When opened, the electric coupling can simultaneously realize a corresponding increase in the energy cold air volume to avoid fluctuations in wind pressure during the air supply process; after the equalizing pressure is the same as the cold air pressure, close the air-displacing shut-off valve 229, close the cold air pressure-equalizing valve 214, and open the cold air valve 212 and the hot air valve 211; automatically adjust the opening of the mixed air regulating valve 223 according to the supply air temperature; when the wind temperature drops to the lower limit again, stop the air supply of the other hot air furnace 210, and then put into use the other burning hot air furnace 210, and the hot air furnace 210 starts burning, and the cycle repeats.

[0069] When the temperature is higher than 1220°C to 1230°C, the opening of the air mixing regulating valve 223 can be increased to restore the temperature of the blast furnace to 1220°C to 1230°C. The step of increasing the opening of the air mixing regulating valve 223 includes the following steps:

[0070] The PID controller controls the receiving current signal of the three-position four-way electromagnetic reversing valve 141 to 12-24 mA by detecting the angle through the encoder, thereby adjusting the opening of the three-position four-way electromagnetic reversing valve 141 until the temperature is restored to 1220°C-1230°C, and the receiving current signal of the three-position four-way electromagnetic reversing valve 141 is restored to 12 mA when the current returns to the middle position. The current of 4-12 mA means closing the air mixing regulating valve, and 12-24 mA means opening the air mixing regulating valve.

[0071] When the temperature is lower than 1220°C to 1230°C, the opening of the air mixing regulating valve 223 can be reduced to restore the temperature of the blast furnace to 1220°C to 1230°C;

[0072] The process of reducing the opening of the air mixing regulating valve 223 includes the following steps:

[0073] The angle is detected by the encoder, and the PID controller controls the size of the receiving current signal of the three-position four-way solenoid reversing valve 141 to 4-12mA, thereby adjusting the opening of the three-position four-way solenoid reversing valve 141 until the temperature recovers to 1220℃~1230℃, and the receiving current signal of the three-position four-way solenoid reversing valve 141 returns to the middle current to 12mA. The current of 4-12mA closes the mixed air regulating valve, and 12-24mA opens the mixed air regulating valve.

[0074] Therefore, by adopting an automated hydraulic control system consisting of multiple accumulator groups and controllers, the energy-saving operation of the hydraulic control system is ensured and the service life of the hydraulic control system is improved. It is applicable to various blast furnace hot blast furnace 210 hydraulic systems. In particular, it has a good effect in ensuring the service life and stable operation of the blast furnace hydraulic system.

[0075] The second aspect of this application is as follows Figure 2 As shown, a blast furnace air supply system 200 is provided, including a hot blast stove 210 and the above-mentioned hydraulic system; the hot blast stove 210 is provided with one or more valves; the telescopic end of each hydraulic cylinder 140 is connected to the corresponding valve of the hot blast stove 210 to open or close the corresponding valve.

[0076] In some embodiments, taking four hot blast furnaces 210 as an example, the four hot blast furnaces 210 adopt a two-burning and two-sending method. Two hot blast furnaces 210 supply air to ensure that the supply air temperature is between 1220 and 1230°C. When the supply air temperature does not meet the lower limit requirement, one of the two hot blast furnaces 210 that are burning is put into supplying air, and then one hot blast furnace 210 is stopped from supplying air, and the hot blast furnace 210 performs the burning operation; when the wind temperature drops to the lower limit again, another hot blast furnace 210 that is burning is put into supplying air, and then the other hot blast furnace 210 is stopped from supplying air, and the hot blast furnace 210 performs the burning operation; and this cycle repeats; usually each valve is actuated once every more than one hour. In order to avoid energy waste, two sets of accumulators are used to provide daily power. The high-pressure accumulator provides power to the hot air valve 211 and the cold air valve 212; the low-pressure accumulator can provide power for all other valves;

[0077] In some embodiments, the one or more valves further include a hot air valve 211 connected to the blast furnace through a pipeline, a cold air valve 212 connected to the cold air through a pipeline, a waste air valve 213 for pressure relief, a pressure equalizing valve 214 for pressure equalization, and a smoke sampling valve 215 for detection. In other embodiments, a preheating furnace 228 and a heat exchanger are also included. The preheating furnace 228 is mainly used to heat the combustion air for the hot blast furnace 210; the heat exchanger is used to preheat the blast furnace gas; and energy waste is reduced by preheating the air and gas.

[0078] In some embodiments, a pressure measuring device is added to the pipeline connected to the hot air valve 211, the hot air valve 211 outlet pressure measuring point 8.1, the hot air valve 211 inlet pressure measuring point 8.2 and the cold air valve 212, the cold air valve 212 inlet pressure measuring point 2.1, and the cold air valve 212 outlet pressure measuring point 2.2. When the pressure difference is less than or equal to 10kpa, the valve can be opened by electrical connection to prevent the pressure difference from being too large and causing failure to open normally, resulting in pressure loss in the hydraulic system and damage to the equipment. When the pressure difference is greater than 10kpa, if the pressure in the hot air furnace 210 is high, the waste air valve 213 can be electrically connected to open the pressure relief. If the pressure in the hot air furnace 210 is low, the cold air equalizing pressure valve 214 can be opened for pressurization.

[0079] In some embodiments, when air is supplied: other valves are in a closed state, the cold air equalizing pressure valve 214 is opened to pressurize the hot air furnace 210 to the same pressure as the hot air valve 211, then the cold air valve 212 is opened, the cold air equalizing pressure valve 214 is closed, and the hot air valve 211 is opened, so that the 200°C cold air from the energy source passes through the checkered bricks in the hot air furnace 210 and is quickly heated to above 1220 degrees and the air is continuously supplied for about 70 minutes.

[0080] When burning: after putting into a burning hot air furnace 210 in the state of air supply as above, close the hot air valve 211 and the cold air valve 212; open the waste air valve 213 to release the pressure. When the pressure is unloaded to 10KPa, close the waste air valve 213, open the first flue valve 216 and the second flue valve 221, open the air combustion valve 220 (the pressure inside and outside the air combustion valve 220 pipeline is 10KPa), open the gas shut-off valve 217, close the gas release valve 218, open the gas combustion valve 219 to enter the burning state, and at the same time open the smoke sampling valve 215 to collect the smoke components in real time.

[0081] In a third aspect of the present application, a method for controlling the valve hydraulic pressure of a hot blast furnace 210 is provided, which is applicable to the above-mentioned blast furnace air supply system 200.

[0082] Obtain the number of hot air furnace 210 valves to be opened or closed;

[0083] When the number of valves is less than 5, the high-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast stove 210 to be opened or closed, so that the valve of the hot blast stove 210 to be opened or closed is opened or closed; when the number of valves is more than 5, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast stove 210 to be opened or closed, so that the valve of the hot blast stove 210 to be opened or closed is opened or closed.

[0084] In some embodiments, when the number of valves is more than 5, controlling the low-pressure accumulator group device to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast stove 210 to be opened or closed, so as to open or close the valve of the hot blast stove 210 to be opened or closed, specifically includes:

[0085] When the number of valves is 5 to 10, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast stove 210 to be opened or closed, so that the valve of the hot blast stove 210 to be opened or closed is opened or closed;

[0086] When the number of valves is 10 to 15, the low-pressure accumulator group device and / or the high-pressure accumulator group device are controlled to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast furnace 210 to be opened or closed, so that the valve of the hot blast furnace 210 to be opened or closed is opened or closed;

[0087] When the number of valves is more than 15, the low-pressure accumulator group device and / or the high-pressure accumulator group device and / or the main oil supply device are controlled to supply oil to the hydraulic cylinder 140 corresponding to the valve of the hot blast stove 210 to be opened or closed, so that the valve of the hot blast stove 210 to be opened or closed is opened or closed.

[0088] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0089] 1) The operation process of the hydraulic system of the present application is convenient, fast and safe; it can solve the serious impact of the internal unloading of each reversing valve on the hydraulic system, reduce the frequency of workers' troubleshooting, and ensure the normal operation of the blast furnace hydraulic system. At the same time, the system can be applied to the hydraulic systems of various hot blast furnaces, with a wide range of applications, ensuring the stable operation of the hydraulic system and improving the service life of the hydraulic control system.

[0090] 2) The hot blast furnace valve hydraulic control system of the present application can control the opening or closing of the hot blast furnace valve, and adopts a high-pressure accumulator group device and a low-pressure accumulator group device to provide daily power for the hot blast furnace valve. The high-pressure accumulator group device provides power for heavier equipment valves, such as hot blast valves and cold blast valves; the low-pressure accumulator group device can provide power for lighter equipment valves, thereby avoiding energy waste. By adopting multiple accumulator groups to control the opening or closing of the hot blast furnace valve, the energy-saving operation of the hydraulic control system is guaranteed, and the service life of the hydraulic control system is improved. It is suitable for various types of blast furnace hot blast furnace hydraulic systems. In particular, it has a good effect in ensuring the service life and stable operation of the blast furnace hydraulic system.

[0091] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0092] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A hot blast stove valve hydraulic control system, characterized in that: include: A main oil supply device, used for providing and storing hydraulic oil; A high-pressure accumulator group device and a low-pressure accumulator group device, wherein the working pressure of the high-pressure accumulator group device is greater than that of the low-pressure accumulator group device; The hydraulic cylinder has the same number as the valves of the hot blast furnace, and the telescopic end of each hydraulic cylinder is connected to the corresponding valve to open or close the corresponding valve. The rodless chamber of the hydraulic cylinder can be switchably connected to at least one of the main oil supply device, the high-pressure accumulator group device and the low-pressure accumulator group device, and the rod chamber of the hydraulic cylinder is connected to the main oil supply device.

2. The hot blast stove valve hydraulic control system according to claim 1, characterized in that: The working pressure of the high-pressure accumulator group device is 10-15 MPa; the working pressure of the low-pressure accumulator group device is 7-15 MPa.

3. The hot blast stove valve hydraulic control system according to claim 1, characterized in that: The high-pressure accumulator group device and the low-pressure accumulator group device each include a plurality of accumulator groups, one or more pressure relays, a control valve assembly and a hydraulically controlled one-way valve; The accumulator group is connected to the hydraulic cylinder through a pipeline, and the one or more pressure relays, the control valve assembly and the hydraulically controlled one-way valve are arranged on the pipeline.

4. The hot blast stove valve hydraulic control system according to any one of claims 1 to 3, characterized in that: The main oil supply device includes an oil tank and a first branch and a second branch connected to the oil tank. The first branch includes a shut-off valve, a main pump and a main oil supply filter connected in sequence. The main oil supply filter is connected to the high-pressure accumulator group device and / or the low-pressure accumulator group device and / or the hydraulic cylinder; the second branch includes a return oil filter and a return oil check valve connected in sequence. The return oil filter is connected to the hydraulic cylinder.

5. The hot blast stove valve hydraulic control system according to any one of claims 1 to 3, characterized in that: The hot blast furnace valve hydraulic control system also includes a pressure relief device, which includes a pressure relief pipeline connected to the main oil supply filter and a throttle valve, a two-position three-way solenoid valve and a relief valve arranged on the pressure relief pipeline.

6. The hot blast stove valve hydraulic control system according to any one of claims 1 to 3, characterized in that: One of the valves of the hot blast stove is a flow regulating valve; The hot blast stove valve hydraulic control system comprises a reversing valve, a pilot valve and an opening sensor for detecting the opening of the flow regulating valve; The controller, the opening sensor, the reversing valve and the pilot valve are all electrically connected to the controller.

7. A blast furnace air supply system, characterized in that: include: Hot blast furnace, equipped with more than one valve; In the hydraulic system according to any one of claims 1 to 6, the telescopic end of each hydraulic cylinder is connected to a valve corresponding to the hot blast furnace to open or close the corresponding valve.

8. The blast furnace air supply system according to claim 7, characterized in that: The one or more valves also include a hot air valve connected to the blast furnace through a pipeline, a cold air valve connected to the cold air through a pipeline, a waste air valve for pressure relief, an equalizing valve for pressure equalization, and a smoke sampling valve for detection.

9. A hot blast furnace valve hydraulic control method, applicable to the blast furnace air supply system according to any one of claims 7-8, characterized in that: The steps include: Get the number of hot air furnace valves to be opened or closed; When the number of valves is less than 5, the high-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed; when the number of valves is more than 5, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed.

10. The hot blast stove valve hydraulic control method according to claim 9, characterized in that: When the number of the valves is more than 5, controlling the low-pressure accumulator group device to supply oil to the hydraulic cylinder corresponding to the hot blast furnace valve to be opened or closed, so that the hot blast furnace valve to be opened or closed is opened or closed, specifically includes: When the number of the valves is 5 to 10, the low-pressure accumulator group device is controlled to supply oil to the hydraulic cylinder corresponding to the hot blast furnace valve to be opened or closed, so that the hot blast furnace valve to be opened or closed is opened or closed; When the number of the valves is 10 to 15, the low-pressure accumulator group device and / or the high-pressure accumulator group device are controlled to supply oil to the hydraulic cylinder corresponding to the hot blast furnace valve to be opened or closed, so that the hot blast furnace valve to be opened or closed is opened or closed; When the number of valves is 15 or more, the low-pressure accumulator group device and / or the high-pressure accumulator group device and / or the main oil supply device are controlled to supply oil to the hydraulic cylinder corresponding to the hot blast stove valve to be opened or closed, so that the hot blast stove valve to be opened or closed is opened or closed.

Images