CN110966456B - Air filtering differential pressure overrun protector for blast furnace blower - Google Patents
Air filtering differential pressure overrun protector for blast furnace blower Download PDFInfo
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- CN110966456B CN110966456B CN201811155948.9A CN201811155948A CN110966456B CN 110966456 B CN110966456 B CN 110966456B CN 201811155948 A CN201811155948 A CN 201811155948A CN 110966456 B CN110966456 B CN 110966456B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0087—Bypass or safety valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention relates to a blast furnace blower air-filtering differential pressure overrun protection device, which comprises a pneumatic control through atmosphere quick-opening device, a bypass air inlet pipe, a blast furnace blower unit, an air outlet pipe, an air inlet pipe, a dehumidifier, an air inlet differential pressure measuring point and an air filtering chamber, wherein the air filtering chamber and the dehumidifier are integrally arranged on one side of the blast furnace blower unit, the air filtering chamber is communicated with the dehumidifier, air is sucked from an inlet on the left side of the air filtering chamber, an outlet of the dehumidifier is connected with an inlet of a blast furnace blower through an air inlet pipeline, the bypass air inlet pipe is additionally arranged between the dehumidifier and an air inlet pipeline of a fan, and the pneumatic control through atmosphere quick-opening device is additionally arranged in the middle of the bypass air inlet pipe; this scheme structure is ingenious compact, through the pneumatic through-put of quick bypass air inlet, guarantees fan safe operation.
Description
Technical Field
The invention relates to a protection device, in particular to an overrun protection device for air filtering differential pressure of a blast furnace blower, and belongs to the technical field of automatic control detection.
Background
The blast furnace blower compresses air, outputs hot air with certain pressure and temperature, and delivers the hot air to the blast furnace hot blast stove for ironmaking production, and is an extremely important power device in the ironmaking production. The air-blower import sets up air filter, and its purpose is with the large granule dust in the air, impurity filtering separation, will be more for doing work in the pure air send people's compressor, avoids the air admission fan that the dust content is high, harms the fan blade, reduces fan operation life.
At present, an air filtering chamber and a dehumidifier are generally arranged at an inlet of a blast unit matched with large blast furnace ironmaking, air is filtered, and then moisture in the air is further decomposed, so that the operation efficiency of a fan is further improved, and the unit consumption of operation is reduced. The drawback of such an arrangement is also highlighted: once a filter cylinder in a filter chamber is blocked or a filter screen of a dehumidifier is blocked, the air inlet differential pressure is extremely high, the unit consumption of the fan is increased, if the blockage is extremely serious, the air inlet system of the fan is paralyzed, an irreversible shriveling accident occurs, the structure of the fan is directly destroyed, and irrecoverable huge economic loss is caused, so that a new scheme is urgently needed to solve the technical problem.
Disclosure of Invention
The invention provides a blast furnace blower air filtering differential pressure overrun protection device aiming at the technical problems in the prior art, the scheme has an ingenious and compact structure, and the safe operation of a fan is ensured by a rapid bypass air inlet pneumatic straight-through device.
In order to achieve the purpose, the technical scheme of the invention is as follows: the protection device is characterized by comprising a pneumatic control through atmosphere quick-opening device, a bypass air inlet pipe, a blast furnace blower unit, an air outlet pipe, an air inlet pipe, a dehumidifier, an air inlet differential pressure measuring point and a air filtering chamber, wherein the air filtering chamber and the dehumidifier are integrally arranged on one side of the blast furnace blower unit, the air filtering chamber is communicated with the dehumidifier, air is sucked from an inlet on the left side of the air filtering chamber, an outlet of the dehumidifier is connected with an inlet of a blast furnace blower through an air inlet pipeline, the bypass air inlet pipe is additionally arranged between the dehumidifier and an air inlet pipeline of a fan, and the pneumatic control through atmosphere quick-opening device is additionally arranged in the middle of the bypass air inlet pipe. In the scheme, a pneumatic control direct atmosphere quick opening device is additionally arranged at the tail end of the inlet of the fan, namely an air filtering chamber and an air inlet pipeline behind a dehumidifier, and the differential pressure at the inlet of the fan is monitored on line in real time by utilizing a differential pressure detection technology.
As an improvement of the present invention, the protection device further comprises an air screen, and the air screen is arranged at the inlet of the bypass air inlet pipe.
As an improvement of the invention, an upper layer, a middle layer and a lower layer of filter cylinder layers are arranged in the air filtering chamber, differential pressure measuring points are respectively taken from the upper layer, the middle layer and the lower layer of filter cylinder layers of the air filtering chamber, and the filter cylinder layers are collected to the bottom end in a centralized manner and carry out data acquisition through an air inlet differential pressure measuring point 8.
As an improvement of the invention, the pneumatic control direct-connection atmosphere quick opening device comprises a two-position two-way electromagnetic valve, a pneumatic actuator cylinder, a piston, a quick exhaust valve, a gas circuit amplifier, a gas circuit multiplexer, a valve positioner, a two-position three-way electromagnetic valve, a one-way valve, a gas storage tank, a pressure regulating valve, an air filter, a valve position feedback transmitter, a butterfly valve plate and a bypass air inlet pipe,
the compressed air after passing through the filter and the pressure reducing valve is divided into three paths, wherein one path of the compressed air passes through the one-way valve to the four-way valve and then to the air path amplifier, the air storage tank and the F port of the multiplexer; one path of the air pressure enters a SUP port of the multiplexer after passing through a three-way electromagnetic valve S1, and the air pressure of the SUP port compresses a spring in the multiplexer, so that an A port is communicated with a B port, and a D port is communicated with an E port in an air path in the multiplexer; the other path is connected to a SUP port of the valve positioner and used as an air source of the valve positioner. When the output of the DCS control signal is increased, the output of the A port of the positioner is increased, and the output of the B port of the positioner is reduced; the increased air pressure of the port A passes through a port AB of the multiplexer, and acts on an upper cavity of an actuating mechanism cylinder after the quick exhaust valve; the air pressure of the port B is used as an input signal of the air path amplifier through a port DE of the multiplexer, and the pressure output to the lower cavity of the cylinder actuating mechanism by the air path amplifier is controlled; at this time, the pressure of the lower part of the piston of the cylinder plus the pressure of the wind pressure of the pipeline acting on the disc plate moves downwards, and the opening degree of the valve is reduced. On the contrary, when the DCS control signal is reduced, the output of the A port of the positioner is reduced, the B port of the positioner is increased, and at the moment, due to the action of the quick exhaust valve and the air path amplifier, the piston moves upwards, and the opening of the valve is increased.
A control method of a blast furnace blower air filtering differential pressure overrun protection device comprises the following steps: when the inlet differential pressure of the fan exceeds the alarm value of 1.5Kpa, the DCS control system receives the differential pressure value, compares the differential pressure value with the set value of 1.5Kpa, and outputs a 4-20mA signal to control the pneumatic straight-through device to perform stepping adjustment on the opening until the inlet differential pressure value of the fan is maintained at about 1.5Kpa, so that the blockage condition of a filter cylinder in a fan filtering chamber can be further checked by maintainers, and time can be gained for replacing the filter cylinder. When the differential pressure at the inlet of the fan directly exceeds the high limit value of 3.5Kpa instantly, the DCS control system receives the differential pressure signal and directly triggers and outputs a switching value signal, two paths of electromagnetic valves of the pneumatic straight-through device are forced to lose power, the straight-through device is quickly opened to communicate with the atmosphere, the fan air filtering chamber which is seriously blocked is directly shielded, and the fan bypass air inlet continues to operate at the moment, so that the stability and the safety of unit equipment are ensured. Through the detection of the pressure difference behind the air filtering chamber of the fan, once the set value is exceeded, the two-position two-way electromagnetic valve of the pneumatic straight-through device receives a DCS system instruction, the electromagnetic valve is powered off, compressed air is quickly decompressed and exhausted, the pneumatic straight-through device is quickly opened, a fan inlet bypass is opened, air enters the fan from a bypass port to continue acting and compressing, and the shriveling suction accident caused by the high limit of the differential pressure of the air inlet system of the fan is avoided. And when the fan normally operates, the air inlet differential pressure of the air filtering chamber is 1.2Kpa-1.5 Kpa. Once the differential pressure value exceeds the alarm set value and is lower than a high limit value, (namely more than 1.5Kpa and less than 3.5 Kpa), the technology automatically controls and adjusts the valve opening of the pneumatic direct-to-atmosphere quick opening device, adjusts the air inlet quantity through a bypass, ensures the safety of a fan, promotes the normal air inlet differential pressure, wins time for checking the fault of a filter chamber, replaces a filter cartridge and simultaneously protects the unit to operate economically; when the air inlet differential pressure value of the fan exceeds a high limit value (namely greater than 3.5 Kpa), the technology automatically controls the two electromagnetic valves of the pneumatic straight-through atmosphere quick-opening device to lose electricity and release pressure, the valve of the pneumatic straight-through atmosphere quick full-opening device quickly opens the straight-through atmosphere, and the fan is instantly protected to operate safely.
Compared with the prior art, the invention has the following advantages: 1) according to the scheme, the air inlet differential pressure of the fan is monitored in real time by using a differential pressure detection technology, and the air is directly communicated with an atmospheric device through linkage bypass pneumatic, so that the safety of a unit is ensured; 2) the pneumatic fast through-atmosphere device is designed, the response speed is fast, and the damage of differential pressure to fan equipment is avoided; 3) the opening degree of the pneumatic device is adjusted through the valve positioner, and the pneumatic through device is quickly opened through the control of the electromagnetic valve; 4) an automatic adjusting loop for detecting and tracking the air inlet pressure difference of the fan is designed, and the air inlet pressure difference of the fan is ensured within a normal range by automatically adjusting the opening of a pneumatic straight-through device; 5) a high-limit protection loop of the air inlet pressure difference of the fan is designed, the pneumatic direct atmosphere device of the fan bypass is quickly opened by controlling the electromagnetic valve to lose power and release pressure, and the normal air inlet of the fan is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of a high inlet air pressure difference protection device of a fan;
FIG. 2 is a schematic diagram of a pneumatic control direct-to-atmosphere quick-opening device;
fig. 3 and 4 are schematic diagrams of the control process.
In the figure: 1. an air filter screen, 2, a pneumatic control through-air quick-opening device, 3, a bypass air inlet pipe, 4, a blast furnace blower unit, 5, an air outlet pipe, 6, an air inlet pipe, 7, a dehumidifier, 8, an air inlet differential pressure measuring point, 9 and a filter chamber;
10. the device comprises a two-position two-way electromagnetic valve, 11, a pneumatic actuator cylinder, 12, a piston, 13, a quick exhaust valve, 14, a gas circuit amplifier, 15, a gas circuit multiplexer, 16, a valve positioner, 17, a two-position three-way electromagnetic valve, 18, a one-way valve, 19, a gas storage tank, 20, a pressure regulating valve, 21, an air filter, 22, a valve position feedback transmitter, 23 and a butterfly valve plate.
Detailed Description
For the purposes of promoting an understanding and appreciation of the invention, reference will now be made to the following detailed description of the invention taken in conjunction with the accompanying drawings.
Example 1: referring to fig. 1 and 2, the blast furnace blower air filtering differential pressure overrun protection device comprises a pneumatic control through atmosphere quick opening device 2, a bypass air inlet pipe 3, a blast furnace blower unit 4, an air outlet pipe 5, an air inlet pipe 6, a dehumidifier 7, an air inlet differential pressure measuring point 8 and a air filtering chamber 9, wherein the air filtering chamber 9 and the dehumidifier 7 are integrally arranged on one side of the blast furnace blower unit 4, the air filtering chamber 9 is communicated with the dehumidifier 7, air is sucked from an inlet on the left side of the air filtering chamber 9, an outlet of the dehumidifier 7 is connected with an inlet of the blast furnace blower through an air inlet pipe 6, the bypass air inlet pipe 3 is additionally arranged between the dehumidifier 7 and the air inlet pipe 6 of the blower, and the pneumatic control atmosphere quick opening device 2 is additionally arranged in the middle of the bypass air inlet pipe 3. In the scheme, a pneumatic control through-atmosphere quick opening device is additionally arranged at the tail end of an inlet of a fan, namely an air filtering chamber and an air inlet pipeline behind a dehumidifier, the differential pressure of the inlet of the fan is monitored on line in real time by using a differential pressure detection technology, the protection device further comprises an air filter screen 1, and the air filter screen 1 is arranged at the inlet of a bypass air inlet pipe 3; an upper layer, a middle layer and a lower layer of filter cylinder layers are arranged in the air filtering chamber, differential pressure measuring points are respectively taken from the upper layer, the middle layer and the lower layer of filter cylinder layers of the air filtering chamber 9 and are collected to the bottom end in a centralized manner to carry out data acquisition through an air inlet differential pressure measuring point 8, the pneumatic control direct-connection atmosphere quick-opening device comprises a two-position two-way electromagnetic valve 10, a pneumatic actuating mechanism cylinder 11, a piston 12, a quick-discharge valve 13, a gas circuit amplifier 14, a gas circuit multiplexer 15, a valve positioner 16, a two-position three-way electromagnetic valve 17, a one-way valve 18, a gas storage tank 19, a pressure regulating valve 20, an air filter 21, a valve position feedback transmitter 22, a butterfly valve plate 23 and a bypass air inlet pipe 3, and after compressed air passes through the filter 21, the compressed air decompressed by the pressure regulating valve 20 is divided into three paths, wherein one path of the compressed air passes through the one-way valve 18 to the four-way valve and then to the air path amplifier 14, the air storage tank 19 and an F port of the multiplexer 15; one path of the air pressure enters a SUP port of the multiplexer 15 after passing through a two-position three-way electromagnetic valve 17, and the air pressure of the SUP port compresses a spring inside the multiplexer 15, so that an A port is communicated with a B port, and a D port is communicated with an E port in an air path inside the multiplexer 15; the other to the SUP port of the valve positioner 16 as the gas source for the valve positioner. When the output of the DCS control signal is increased, the output of the port A of the valve positioner is increased, and the output of the port B of the valve positioner is reduced; the increased air pressure of the port A passes through the port AB of the multiplexer 15, reaches the quick discharge valve 13 and then acts on the upper cavity of the actuating mechanism cylinder 11; the air pressure of the port B is used as an input signal of the air path amplifier 14 through a port DE of the multiplexer, and the pressure output from the air path amplifier 14 to the lower cavity of the cylinder actuating mechanism is controlled; at this time, the pressure of the lower part of the cylinder piston 12 plus the pressure of the duct wind pressure acting on the butterfly valve plate 23 moves down the piston 12, and the valve opening decreases. On the contrary, when the DCS control signal is reduced, the output of the port A of the valve positioner is reduced, the port B of the valve positioner is increased, and at this time, the piston 12 moves upwards due to the action of the quick exhaust valve and the air path amplifier, so that the opening degree of the valve is increased.
Example 2: referring to fig. 1-4, a control method of a blast furnace blower air filtering differential pressure overrun protection device comprises the following steps: when the inlet differential pressure of the fan exceeds the alarm value of 1.5Kpa, the DCS control system receives the differential pressure value, compares the differential pressure value with the set value of 1.5Kpa, and outputs a 4-20mA signal to control the pneumatic straight-through device to perform stepping adjustment on the opening until the inlet differential pressure value of the fan is maintained at about 1.5Kpa, so that the blockage condition of a filter cylinder in a fan filtering chamber can be further checked by maintainers, and time can be gained for replacing the filter cylinder. When the differential pressure at the inlet of the fan directly exceeds the high limit value of 3.5Kpa instantly, the DCS control system receives the differential pressure signal and directly triggers and outputs a switching value signal, two paths of electromagnetic valves of the pneumatic straight-through device are forced to lose power, the straight-through device is quickly opened to communicate with the atmosphere, the fan air filtering chamber which is seriously blocked is directly shielded, and the fan bypass air inlet continues to operate at the moment, so that the stability and the safety of unit equipment are ensured. And when the fan normally operates, the air inlet differential pressure of the air filtering chamber is 1.2Kpa-1.5 Kpa. Once the differential pressure value exceeds the alarm set value and is lower than a high limit value, (namely more than 1.5Kpa and less than 3.5 Kpa), the technology automatically controls and adjusts the valve opening of the pneumatic direct-to-atmosphere quick opening device, adjusts the air inlet quantity through a bypass, ensures the safety of a fan, promotes the normal air inlet differential pressure, wins time for checking the fault of a filter chamber, replaces a filter cartridge and simultaneously protects the unit to operate economically; when the air inlet differential pressure value of the fan exceeds a high limit value (namely greater than 3.5 Kpa), the technology automatically controls the two electromagnetic valves of the pneumatic straight-through atmosphere quick-opening device to lose electricity and release pressure, the valve of the pneumatic straight-through atmosphere quick full-opening device quickly opens the straight-through atmosphere, and the fan is instantly protected to operate safely.
The working principle is as follows: referring to fig. 1-4, a control method of a blast furnace blower air filtering differential pressure overrun protection device,
the air inlet differential pressure high-stepping automatic regulation mode is as follows: when the detection of the differential pressure at the inlet of the fan exceeds the alarm value and does not exceed the limit value (more than 1.5Kpa and less than 3.5 Kpa), the DCS adjusts the opening of the valve of the pneumatic straight-through device through automatic control, overcomes the defect of air intake reduction caused by high differential pressure by adjusting bypass air inlet, and adjusts the opening of the pneumatic straight-through device by tracking the normal differential pressure value to 1.5Kpa until the air inlet differential pressure is normal. The time is saved for replacing the filter cartridge of the filter chamber in time, and the unit consumption of the fan operation is reduced to a certain extent. Reduce the steam consumption and reduce the operation cost.
The working principle of regulating the opening degree of the pneumatic control direct-connection atmosphere quick-opening device is as follows: under normal conditions, the two electromagnetic valves are electrified and are communicated with the three-way electromagnetic valve 1 and the three-way electromagnetic valve 2; two-way solenoid valves, 1 and 2 are open. The compressed air after passing through the filter and the pressure reducing valve is divided into three paths, wherein one path of the compressed air passes through the one-way valve to the four-way valve and then to the air path amplifier, the air storage tank and the F port of the multiplexer; one path of the air pressure enters a SUP port of the multiplexer after passing through a three-way electromagnetic valve S1, and the air pressure of the SUP port compresses a spring in the multiplexer, so that an A port is communicated with a B port, and a D port is communicated with an E port in an air path in the multiplexer; the other path is connected to a SUP port of the valve positioner and used as an air source of the valve positioner. When the output of the DCS control signal is increased, the output of the A port of the positioner is increased, and the output of the B port of the positioner is reduced; the increased air pressure of the port A passes through a port AB of the multiplexer, and acts on an upper cavity of an actuating mechanism cylinder after the quick exhaust valve; the air pressure of the port B is used as an input signal of the air path amplifier through a port DE of the multiplexer, and the pressure output to the lower cavity of the cylinder actuating mechanism by the air path amplifier is controlled; at this time, the pressure of the lower part of the piston of the cylinder plus the pressure of the wind pressure of the pipeline acting on the disc plate moves downwards, and the opening degree of the valve is reduced. On the contrary, when the DCS control signal is reduced, the output of the A port of the positioner is reduced, the B port of the positioner is increased, and at the moment, due to the action of the quick exhaust valve and the air path amplifier, the piston moves upwards, and the opening of the valve is increased.
The air inlet differential pressure high-limit rapid bypass direct control mode comprises the following steps: when the fan air inlet differential pressure high limit needs to be opened quickly to protect the fan safety, the DCS control system detects the differential pressure high limit, the differential pressure value is larger than 3.5Kpa, the DCS immediately and logically controls the two electromagnetic valves to lose power and relieve pressure, the valve plate of the device is opened quickly, the fan bypass enters air at a large flow rate, and the operation safety of the fan air inlet system is ensured.
The quick-opening working principle of the pneumatic control direct-connection atmosphere quick-opening device is as follows: when the DCS controls the two paths of electromagnetic valves to lose power, the three-way electromagnetic valves 1 and 3 are switched on, and the two-way electromagnetic valves 1 and 2 are switched on; at the moment, the pressure of the SUP port of the multiplexer is discharged through the 3 ports of the three-way electromagnetic valve, the gas circuit of the multiplexer is converted under the action of an internal spring, the B port is communicated with the C port, and the E port is communicated with the F port; the air on the air storage tank and the air of the air source pass through the FE port of the multiplexer to serve as a control signal of the air path amplifier, the air pressure of the air storage tank is very high (equal to the outlet pressure of the pressure reducing valve), the air path amplifier is fully opened, the air in the air storage tank and the air of the air source enter the lower cavity of the air cylinder through the air path amplifier at the maximum flow rate, the air in the upper cavity is quickly exhausted to the atmosphere through the quick exhaust valve and the two-way electromagnetic valve, the valve of the pneumatic bypass direct connection device is quickly opened, the fan realizes quick bypass air inlet, and the safety of fan equipment is guaranteed.
It should be noted that the above-mentioned embodiments do not limit the scope of the present invention, and equivalents and substitutions made on the basis of the above-mentioned embodiments are included in the scope of the present invention.
Claims (2)
1. The protection device is characterized by comprising a pneumatic control through atmosphere quick-opening device, a bypass air inlet pipe, a blast furnace blower unit, an air outlet pipe, an air inlet pipe, a dehumidifier, an air inlet differential pressure measuring point and a moisture filtering chamber, wherein the air filtering chamber and the dehumidifier are integrally arranged on one side of the blast furnace blower unit; the protection device also comprises an air filter screen, the air filter screen is arranged at the inlet of the bypass air inlet pipe, an upper layer, a middle layer and a lower layer of filter cylinder layers are arranged in the filter chamber, differential pressure measuring points are respectively taken from the upper layer, the middle layer and the lower layer of filter cylinder layers of the filter chamber and are connected out, and the filter cylinder layers are collected to the bottom end in a centralized manner and carry out data acquisition through the air inlet differential pressure measuring points; the pneumatic control direct-connection atmosphere quick opening device comprises a two-position two-way electromagnetic valve, a pneumatic actuating mechanism cylinder, a piston, a quick exhaust valve, a gas circuit amplifier, a multiplexer, a valve positioner, a two-position three-way electromagnetic valve, a one-way valve, a gas storage tank, a pressure regulating valve, an air filter, a valve position feedback transmitter, a butterfly valve plate and a bypass air inlet pipe, compressed air is subjected to pressure reduction by the pressure regulating valve through the filter and then divided into three paths, one path of compressed air passes through the one-way valve to the four-way valve and then respectively reaches an F port of the gas circuit amplifier, the gas storage tank and the multiplexer; one path of the signal passes through a two-position three-way electromagnetic valve and then reaches a SUP port of the multiplexer, the air pressure of the SUP port compresses a spring in the multiplexer, so that a port A and a port B of the multiplexer are communicated, and a port D and a port E of the multiplexer are communicated; the other path of the gas is connected to a SUP port of the valve positioner and is used as a gas source of the valve positioner; the port A of the valve positioner is connected with the port A of the multiplexer, and the port B of the valve positioner is connected with the port D of the multiplexer; the port B of the multiplexer is connected with the upper cavity of the pneumatic actuating mechanism cylinder, the lower cavity of the pneumatic actuating mechanism cylinder is connected with the air circuit amplifier, and the port E of the multiplexer is connected with the input signal end of the air circuit amplifier.
2. The control method of the blast furnace blower air filtering differential pressure overrun protector according to claim 1, characterized by comprising the following steps: when the differential pressure of the inlet of the blast furnace blower unit exceeds the alarm value of 1.5Kpa, the DCS control system receives the differential pressure value, compares the differential pressure value with the set value of 1.5Kpa, outputs a 4-20mA signal to control the pneumatic control through-air quick-opening device to adjust the opening degree in a stepping mode until the differential pressure value of the inlet of the blast furnace blower unit is maintained at about 1.5Kpa, when the differential pressure of the inlet of the blast furnace blower unit directly exceeds the high limit value of 3.5Kpa instantly, the DCS control system receives the differential pressure signal and directly triggers and outputs a switching value signal, the two-position two-way electromagnetic valve and the two-position three-way electromagnetic valve of the pneumatic control through-air quick-opening device are forced to lose power, the pneumatic control through-air quick-opening device is communicated with the atmosphere, the severely blocked filter chamber of the blast furnace blower unit is directly shielded, and the bypass air intake continues to operate at the moment, so that the unit equipment is stable and safe.
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| CN201811155948.9A CN110966456B (en) | 2018-09-30 | 2018-09-30 | Air filtering differential pressure overrun protector for blast furnace blower |
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