CN117344072A - Blast furnace re-wind gas recovery system and method - Google Patents
Blast furnace re-wind gas recovery system and method Download PDFInfo
- Publication number
- CN117344072A CN117344072A CN202311325339.4A CN202311325339A CN117344072A CN 117344072 A CN117344072 A CN 117344072A CN 202311325339 A CN202311325339 A CN 202311325339A CN 117344072 A CN117344072 A CN 117344072A
- Authority
- CN
- China
- Prior art keywords
- gas
- inlet
- pipeline
- blast furnace
- pressurizing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims description 252
- 230000003584 silencer Effects 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 10
- 239000003034 coal gas Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 208000028659 discharge Diseases 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a blast furnace re-wind gas recovery system and a method, which belong to the technical field of blast furnace ironmaking, and aim to solve the problem of environmental pollution caused by the exhaustion of re-wind gas to the air, wherein the blast furnace re-wind gas recovery system comprises an inlet pipeline (5), a main working pipeline (10) and an outlet pipeline (17) which are sequentially connected, an inlet instrument group (6) and an inlet valve (9) are sequentially arranged on the inlet pipeline (5) along the direction from the inlet end of the inlet pipeline (5) to the outlet end of the inlet pipeline (5), and a gas pressurizing device (12) and a three-way switching valve (13) are sequentially arranged on the main working pipeline (10) along the direction from the inlet end of the main working pipeline (10) to the outlet end of the main working pipeline (10). The blast furnace re-wind gas recovery system and method can purify and discharge non-recoverable re-wind gas in the early stage, purify and recycle re-wind gas in the later stage, and solve the problem of environmental pollution caused by the re-wind gas to the air discharge.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a blast furnace re-wind gas recovery system and a blast furnace re-wind gas recovery method.
Background
The re-blowing means the process from the state of stopping the furnace to the production of the blast furnace, wherein the hot blast furnace continuously introduces hot air into the blast furnace, and smelting pig iron is started after the furnace reaches a preset condition, and the gas exhausted from the furnace is called re-blowing gas. The current blast furnace re-wind gas treatment mode is direct diffusion, the pressure and flow of re-wind gas have large fluctuation along with time, the gas component in the initial stage of re-wind contains oxygen, and along with the progress of re-wind, the oxygen in the re-wind gas gradually decreases until the elimination is zero; so the complex wind gas in the earlier stage does not meet the requirement of a gas pipe network, and the complex wind gas in the later stage meets the recovery requirement. In actual production, because the existing system lacks real-time detection of the composition of the re-circulated air gas, operators cannot judge whether the gas is qualified or not, so that all the re-circulated air gas is not recycled into a gas pipe network to avoid potential safety hazards, but is directly discharged from the top of the furnace to the air. The air-return gas contains a large amount of dust and atmospheric pollutants, and the current air discharge treatment causes serious environmental pollution.
Disclosure of Invention
In order to solve the problem of environmental pollution caused by the air discharge of the re-circulated air gas, the invention provides a system and a method for recovering the re-circulated air gas of a blast furnace, which can purify and discharge the non-recoverable re-circulated air gas in the early stage and purify and recycle the re-circulated air gas in the later stage, thereby solving the problem of environmental pollution caused by the air discharge of the re-circulated air gas.
The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:
the utility model provides a blast furnace complex wind gas recovery system, including the import pipeline that connects gradually, main working pipeline and export pipeline, along the direction of the entry end of import pipeline to the exit end of import pipeline, import instrument cluster and inlet valve have been set gradually on the import pipeline, along the direction of the entry end of main working pipeline to the exit end of main working pipeline, main working pipeline has set gradually coal gas pressure device and three-way switching valve, still be provided with the return circuit on the main working pipeline, three-way switching valve can make coal gas pressure device exhaust gas get into the export pipeline or return to in the coal gas pressure device through the return circuit.
The blast furnace re-wind gas recovery method adopts the blast furnace re-wind gas recovery system, and the blast furnace re-wind gas recovery method sequentially comprises the following steps:
step 1, before the blast furnace is re-winded;
the inlet valve is in a closed state, the gas pressurizing device is started, and the three-way switching valve enables gas discharged by the gas pressurizing device to return into the gas pressurizing device through the loop;
step 2, in the process of re-wind starting of the blast furnace;
the method comprises the steps that the re-air gas discharged by a blast furnace enters an inlet pipeline, an inlet instrument group detects the re-air gas, and when the inlet instrument group detects that the inlet pipeline contains O 2 When the muffler is opened, the inlet valve is in a closed state, and the air is discharged by the rebreathed coal gas; when the inlet instrument cluster detects that the inlet pipeline does not contain O 2 When the blast furnace is recycled, at the moment, the muffler is closed, the inlet valve and the working pipeline valve are opened, the three-way switching valve switches the direction to enable the gas discharged by the gas pressurizing device to enter the outlet pipeline, and the reburn gas in the outlet pipeline enters the clean gas pipe network;
step 3, finishing the blast furnace re-blowing;
the three-way switching valve switches the direction to enable the gas discharged by the gas pressurizing device to return to the gas pressurizing device through the loop, the gas pressurizing device gradually stops working, the inlet valve is closed, the silencer is opened, and the residual gas is discharged to the air through the silencer.
The embodiment of the invention has the beneficial effects that:
1. the blast furnace re-wind gas recovery system can purify and discharge non-recoverable re-wind gas in the early stage and purify and recover re-wind gas in the later stage.
2. The pressure of the gas recovered into the gas pipe network can be ensured to be stable.
3. The fan can be stopped at any time or operated with low power consumption by using a loop and a three-way switching valve.
4. Can cope with the problems occurring in the gas recovery process: the gas flow is overlarge, a single fan fails, the fan surges, and the fan pumps too much to form negative pressure, and oxygen is contained in the gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a blast furnace return gas recovery system according to the present invention.
The reference numerals are explained as follows:
1. a blast furnace; 2. a dust remover; 3. a check valve; 4. a net gas pipe network; 5. an inlet line; 6. an inlet instrument cluster; 7. a first ripple compensator; 8. a muffler; 9. an inlet valve; 10. a main working pipeline; 11. a working pipeline valve; 12. a gas pressurizing device; 13. a three-way switching valve; 14. a one-way valve; 15. a loop; 16. an outlet pressure gauge; 17. an outlet line; 18. a second ripple compensator; 19. and (5) a standby working pipeline.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the blast furnace return air gas recovery system according to the embodiment of the invention comprises an inlet pipeline 5, a main working pipeline 10 and an outlet pipeline 17 which are sequentially connected, wherein an inlet instrument set 6 and an inlet valve 9 are sequentially arranged on the inlet pipeline 5 along the direction from the inlet end of the inlet pipeline 5 to the outlet end of the inlet pipeline 5, a gas pressurizing device 12 and a three-way switching valve 13 are sequentially arranged on the main working pipeline 10 along the direction from the inlet end of the main working pipeline 10 to the outlet end of the main working pipeline 10, a loop 15 is further arranged on the main working pipeline 10, and the three-way switching valve 13 can enable gas discharged by the gas pressurizing device 12 to enter the outlet pipeline 17 or return into the gas pressurizing device 12 through the loop 15.
The inlet instrument group 6 is used for judging whether the gas index meets the recovery requirement, the gas pressurizing device 12 can enable the pressure of the gas to be larger than the gas pressure in the clean gas pipe network 4, and the blast furnace re-wind gas recovery system can purify and discharge the non-recoverable re-wind gas in the early stage and safely recover the re-wind gas in the later stage after purifying.
The three-way switching valve 13 has one inlet port and two outlet ports, and gas entering from the inlet port of the three-way switching valve 13 can be discharged from the first outlet port or the second outlet port of the three-way switching valve 13. The inlet end of the gas pressurizing device 12 is communicated with the outlet end of the inlet pipeline 5, the outlet end of the gas pressurizing device 12 is communicated with the inlet end of the three-way switching valve 13, the first outlet end of the three-way switching valve 13 is communicated with the inlet end of the outlet pipeline 17, the inlet end of the loop 15 is connected with the second outlet end of the three-way switching valve 13, and the outlet end of the loop 15 is communicated with the inlet end of the gas pressurizing device 12.
As shown in fig. 1, the main working pipeline 10 is further provided with a working pipeline valve 11, the loop 15 is provided with a one-way valve 14, gas in the loop 15 can only flow from the inlet end of the loop 15 to the outlet end of the loop 15, gas in the loop 15 cannot flow from the outlet end of the loop 15 to the inlet end of the loop 15, the blast furnace return gas recovery system further comprises a control unit (such as a PLC), and the three-way switching valve 13 and the working pipeline valve 11 are both interlocked (or connected) with the control unit.
The gas pressurizing device 12 is also interlocked with the control unit, the gas pressurizing device 12 is a variable frequency fan (blower), the gas pressurizing device 12 comprises a fan, a motor and a frequency converter which are sequentially connected, and the motor can be understood as an existing variable frequency motor, a bearing of the fan is provided with a vibration detector, the fan is provided with a decibel detector, and the motor is provided with a rotation speed detector. The vibration detector, the decibel detector and the rotation speed detector are all interlocked with the control unit.
The gas system is easy to generate self-reflux in the adjusting process, and the gas pressurizing device 12 can generate surge during self-reflux (backflow air inlet machine), which can influence the operation of equipment and even bring potential safety hazard; accordingly, the vibration detector, the decibel detector, and the rotation speed detector described above are provided. When the fan surge is detected, the three-way switching valve 13 automatically switches positions so that the main working pipeline 10 is disconnected from the outlet pipeline 17 and communicated with the loop 15; the gas pressurizing device 12 does not send gas to the clean gas pipe network 4 any more, but the inlet and the outlet of the gas pressurizing device 12 are communicated through the loop 15 to form internal circulation, so that the fan surge caused by the backflow of the gas into the gas pressurizing device 12 is avoided.
The rotating shaft of the fan is connected with the output shaft of the variable frequency motor through a diaphragm coupler, and the variable frequency motor adjusts the rotating speed through a frequency converter. The fan can adopt a single suction cantilever type structure and the like, and has the advantages of simple structure, convenient maintenance, stable operation and the like. The variable frequency motor is directly driven by the diaphragm coupler, and the fan rotor rotates anticlockwise when seen from the end of the variable frequency motor. The shell of the fan, the cast iron of the bearing box and other materials are made, and the rear side of the shell adopts a sealing structure. The rotor consists of a main shaft and an impeller. In order to adapt to the characteristic of frequent change of the working condition of the compound air gas recovery fan, the main shaft and the impeller are made of materials such as metal, composite materials and the like, which have high strength, good durability and the like, so that the anti-stall and anti-surge capacity of the fan is enhanced. The rotor can run stably after static and dynamic balance correction. The fan is provided with lubrication, hydraulic pressure, water pipelines, an oil pump and the like. The shell rotor and the bearing box are arranged on the integral base.
Surge is accompanied by a sharp increase in noise, and when the decibel detector equipped with the fan detects a sudden increase in noise generated by the fan, the decibel detector signals the control unit. The control unit controls the three-way switching valve 13 to switch over so that the main working pipeline 10 is disconnected from the outlet pipeline 17 and is communicated with the loop 15. The outlet of the fan does not send air to the clean gas pipe network 4 any more, and the air flow automatically flows back to the front end of the fan through the loop 15, so that internal circulation is formed. The function is that the back end of the fan is cut off from communicating with the clean gas pipe network 4 and the standby working pipeline 19, the gas can not flow back to the gas pressurizing device 12, and the surge of the fan is avoided. And secondly, an internal circulation is formed by utilizing a loop, and the rotating speed of the fan can be adjusted, so that the low-energy-consumption standby or gradual shutdown of the fan is realized, and the complex requirements in actual production are met.
As shown in fig. 1, the blast furnace multi-wind gas recovery system further comprises a standby working pipeline 19, wherein the standby working pipeline 19 and the main working pipeline 10 are in parallel connection, and the construction of the standby working pipeline 19 is the same as that of the main working pipeline 10. The devices on the backup working line 19 are also all interlocked with the control unit.
The working pipeline valve 11 controls the communication and cutting off of the pipeline, the one-way valve 14 ensures the one-way flow of the gas in the loop 15, and the gas pressurizing device 12 is an explosion-proof variable frequency fan. When the flow rate of the re-wind gas is too large to exceed the capacity of the gas pressurizing device 12, or when the equipment on the main working pipeline 10 fails; the equipment on the standby working pipeline 19 can be started, so that the smooth gas recovery under abnormal conditions is ensured.
Both the inlet instrument cluster 6 and the inlet valve 9 are interlocked with the control unit, the inlet instrument cluster 6 contains a gas composition detector capable of detecting whether the inlet pipe 5 contains oxygen (O 2 ) The gas composition detector may also be referred to as an oxygen detector.
The inlet instrument group 6 is used for judging whether the gas index meets the recycling requirement; when the compound wind gas contains oxygen and other components which do not meet the recovery requirement, the gas is not recovered, and the inlet valve 9 is closed; meanwhile, the silencer 8 is opened to purify the gas in the inlet pipeline 5 and then discharge the purified gas.
As shown in fig. 1, the inlet end of the inlet pipeline 5 is communicated with the furnace mouth of the blast furnace 1, the inlet pipeline 5 is further provided with a dust remover 2, a first ripple compensator 7 and a silencer 8, the dust remover 2 is positioned between the inlet end of the inlet pipeline 5 and the inlet instrument cluster 6, the first ripple compensator 7 is positioned between the inlet instrument cluster 6 and the inlet valve 9, and the silencer 8 is positioned between the first ripple compensator 7 and the inlet valve 9.
The first bellows compensator 7 is used to counteract the expansion of the pipe at different temperatures to avoid telescoping deformation of the pipe. An inlet valve 9 is arranged behind the first ripple compensator 7, the inlet valve 9 can be a single valve or a combination of a plurality of valves, can be in the forms of butterfly valves, blind plate valves, ball valves and the like, can be driven in a hydraulic, pneumatic and the like manner, and is connected with a PLC control system.
As shown in fig. 1, the outlet end of the outlet pipeline 17 is communicated with the clean gas pipe network 4, an outlet pressure gauge 16, a second ripple compensator 18 and a check valve 3 are sequentially arranged on the outlet pipeline 17 along the direction from the inlet end of the outlet pipeline 17 to the outlet end of the outlet pipeline 17, the blast furnace return air gas recovery system further comprises a control unit, and the outlet pressure gauge 16 is interlocked with the control unit.
The pressure measured by the outlet pressure gauge 16 is linked to the rotational speed of the gas pressurizing device 12. When the gas inlet pressure in the outlet pipeline 17 is higher, the exhaust pressure of the gas pressurizing device 12 is correspondingly increased, and the gas pressurizing device 12 can run at a low speed at the moment; when the inlet pressure in the outlet pipeline 17 is lower, the displacement and pressure of the gas pressurizing device 12 are also lower, and at the moment, the fan can be operated at a high speed through speed regulation so as to ensure that the outlet pressure of the fan is stable and is always larger than the pressure of a gas pipe network, and the control unit controls the rotation speed of the fan by using an inlet pressure acquisition signal. The outlet pipe 17 is provided with a second bellows compensator 18 for counteracting the expansion of the pipe at different temperatures to avoid telescoping deformation of the pipe. The check valve 3 prevents the gas from flowing back into the system through the net gas pipe network 4.
The re-blown gas discharged from the blast furnace 1 can sequentially pass through the inlet pipeline 5, the main working pipeline 10 and the outlet pipeline 17 and then enter the clean gas pipe network 4, and the check valve 3 can enable the gas in the outlet pipeline 17 to flow from the inlet end of the outlet pipeline 17 to the outlet end of the outlet pipeline 17 only, and the gas in the outlet pipeline 17 cannot flow from the outlet end of the outlet pipeline 17 to the inlet end of the outlet pipeline 17.
The pipeline welding points and the sealing rubber rings of all the systems of the blast furnace are easy to have leakage points in long-term production, the inside of the blast furnace system is positive pressure in the production process, and the outside air cannot enter the blast furnace system. According to the characteristics of small flow of the compound air gas in the early stage and large and stable flow of the compound air gas in the later stage, the gas amount in the system is possibly small at the beginning of the recovery of the compound air gas, and if the pumping force of the gas pressurizing device 12 is too large, the gas in the system is possibly pumped out to generate negative pressure, so that external air enters a blast furnace system to be mixed with the gas; in order to eliminate potential safety hazards, the inlet instrument group 6 is utilized to detect the pressure of the system and connect signals into the control unit, when the pressure is lower than the atmospheric pressure, the system sends out low-pressure early warning, and the recovery of the air-return gas system is stopped; meanwhile, the silencer 8 is opened, and the gas is diffused through the silencer 8; to prevent air from entering the net gas pipe network 4.
When the recovery of the rebreathed gas is normally finished or the rebreathed gas is stopped for emergency reasons, the three-way switching valve 13 switches the direction, so that the main working pipeline 10 is disconnected from the outlet pipeline 17 and communicated with the loop 15; the inlet valve 9 and the working line valve 11 are closed. At this time, the gas pressurizing device 12 and the loop 15 form a closed loop, so that the gas pressurizing device 12 steadily reduces the rotation speed until the gas pressurizing device stops. Starting the silencer 8 to purify and diffuse residual gas, and sending a re-wind stopping instruction by the re-wind gas system.
The blast furnace re-wind gas recovery method adopts the blast furnace re-wind gas recovery system, and the blast furnace re-wind gas recovery method sequentially comprises the following steps:
step 1, before the blast furnace is re-winded;
the inlet valve 9 is in a closed state, the working pipeline valve 11 is in a closed state, the gas pressurizing device 12 is opened, the three-way switching valve 13 enables gas discharged by the gas pressurizing device 12 to return into the gas pressurizing device 12 through the loop 15, the gas pressurizing device 12 is opened to gradually increase the power until a preset rotating speed is reached, for example, the rotating speed of the gas pressurizing device 12 is increased to 50% of the rated rotating speed;
step 2, in the process of re-wind starting of the blast furnace;
the method comprises the steps that the re-wind gas discharged by a blast furnace 1 enters an inlet pipeline 5, a silencer 8 is opened, an inlet instrument group 6 detects the re-wind gas, the inlet instrument group 6 sends a detection result to a control unit, the initial re-wind gas which cannot be recovered is purified by the silencer 8 and then discharged to the air, and an inlet valve 9 is in a closed state; when the inlet instrument group 6 detects that the inlet pipeline 5 does not contain oxygen, the blast furnace re-wind recovery is carried out, at the moment, the silencer 8 is closed, the inlet valve 9 and the working pipeline valve 11 are opened (the standby working pipeline 19 is in a closed state and does not work), the three-way switching valve 13 switches the direction to enable the gas discharged by the gas pressurizing device 12 to enter the outlet pipeline 17, and the re-wind gas in the outlet pipeline 17 enters the clean gas pipe network 4;
step 3, finishing the blast furnace re-blowing;
the three-way switching valve 13 switches the direction to enable the gas discharged by the gas pressurizing device 12 to return into the gas pressurizing device 12 through the loop 15, the gas pressurizing device 12 stops working gradually, the inlet valve 9 is closed, the muffler 8 is opened, and the residual gas is discharged to the air through the muffler 8.
The blast furnace re-wind gas recovery method comprises the following steps in sequence: step 1, step 2 and step 3. In step 2, during the recovery of the blast furnace breeze (i.e. when the inlet instrument cluster 6 detects that the inlet pipe 5 does not contain oxygen), the following steps are performed:
when the outlet pressure gauge 16 detects that the air pressure in the outlet pipeline 17 minus the air pressure in the net gas pipe network 4 is greater than or equal to a set value (such as 10KPa-15 KPa), the control unit enables the gas pressurizing device 12 to run at a low speed, for example, the actual rotating speed of a fan in the gas pressurizing device 12 is 30% -50% of the rated rotating speed; when the outlet pressure gauge 16 detects that the air pressure in the outlet pipeline 17 minus the air pressure in the net gas pipe network 4 is smaller than the set value (such as 10KPa-15 KPa), the control unit enables the gas pressurizing device 12 to run at a high speed, for example, the actual rotating speed of a fan in the gas pressurizing device 12 is 70% -90% of the rated rotating speed; so as to ensure that the outlet pressure of the gas pressurizing device 12 is stable and is always larger than the pressure of the clean gas pipe network 4, and the re-blown gas is purified by the dust remover 2 and then pressurized by the gas pressurizing device 12 so as to be recycled to the clean gas pipe network 4.
Typically, only the main working line 10 is working. When the inlet instrument cluster 6 detects that the gas flow exceeds more than twice of the rated flow of the gas pressurizing device 12, or the main working pipeline 10 fails; starting a standby working pipeline 19, namely opening a working pipeline valve 11 in the standby working pipeline 19, and working a gas pressurizing device 12 in the standby working pipeline 19; thereby ensuring the smooth recovery of the gas in abnormal state.
When the recovery of the blast furnace is stopped, the three-way switching valve 13 switches the direction to enable the gas discharged by the gas pressurizing device 12 to return into the gas pressurizing device 12 through the loop 15, namely, the gas pressurizing device 12 circulates in the internal mode, the rotation speed of the gas pressurizing device 12 is reduced to a standby state, and the rotation speed of the gas pressurizing device 12 in the standby state is 10% -20% of the rated rotation speed, so that low-power consumption standby is realized.
When the decibel generated by the gas pressurizing device 12 is more than twice of the normal working decibel of the gas pressurizing device 12, the three-way switching valve 13 switches the direction to enable the gas discharged by the gas pressurizing device 12 to return into the gas pressurizing device 12 through the loop 15; thereby avoiding the surge of the fan caused by the backflow of the gas into the gas pressurizing device 12 and protecting equipment.
When the inlet instrument group 6 detects that the air pressure in the inlet pipeline 5 is lower than a standard atmospheric pressure, the blast furnace re-wind gas recovery system sends out low-pressure early warning, the blast furnace re-wind gas recovery system stops recovery, and the inlet valve 9 is closed to prevent air from entering the clean gas pipe network 4.
When the inlet instrument group 6 detects that the inlet pipeline 5 contains oxygen, the blast furnace reburn air gas recovery system sends out oxygen early warning, the silencer 8 is opened, the inlet valve 9 is closed, the blast furnace reburn air gas recovery system stops recovering, and the gas in the inlet pipeline 5 is discharged to the air through the silencer 8, so that the oxygen is prevented from entering the clean gas pipe network 4.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and technical features, technical features and technical scheme, technical scheme and technical scheme, and embodiments of the invention can be freely combined for use.
Claims (10)
1. The utility model provides a blast furnace compound wind gas recovery system, a serial communication port, blast furnace compound wind gas recovery system is including import pipeline (5), main working pipeline (10) and export pipeline (17) that connect gradually, along the direction of the entry end of import pipeline (5) to the exit end of import pipeline (5), inlet instrument group (6) and import valve (9) have been set gradually on import pipeline (5), along the direction of the entry end of main working pipeline (10) to the exit end of main working pipeline (10), main working pipeline (10) are last to have set gradually coal gas pressure device (12) and three-way switch valve (13), still be provided with return circuit (15) on main working pipeline (10), three-way switch valve (13) can make coal gas pressure device (12) exhaust gas get into export pipeline (17) or return to in coal gas pressure device (12) through return circuit (15).
2. The blast furnace double wind gas recovery system according to claim 1, wherein the three-way switching valve (13) has one inlet end and two outlet ends, the inlet end of the gas pressurizing device (12) is communicated with the outlet end of the inlet pipeline (5), the outlet end of the gas pressurizing device (12) is communicated with the inlet end of the three-way switching valve (13), the first outlet end of the three-way switching valve (13) is communicated with the inlet end of the outlet pipeline (17), the inlet end of the loop (15) is connected with the second outlet end of the three-way switching valve (13), and the outlet end of the loop (15) is communicated with the inlet end of the gas pressurizing device (12).
3. The blast furnace return air gas recovery system according to claim 2, characterized in that the main working pipeline (10) is further provided with a working pipeline valve (11), the loop (15) is provided with a one-way valve (14), gas in the loop (15) can only flow from the inlet end of the loop (15) to the outlet end of the loop (15), the blast furnace return air gas recovery system further comprises a control unit, and the three-way switching valve (13) and the working pipeline valve (11) are both interlocked with the control unit.
4. The blast furnace double wind gas recovery system according to claim 1, further comprising a control unit, wherein a gas pressurizing device (12) is interlocked with the control unit, the gas pressurizing device (12) comprises a fan, a motor and a frequency converter which are sequentially connected, a bearing of the fan is provided with a vibration detector, the fan is provided with a decibel detector, and the motor is provided with a rotation speed detector.
5. The blast furnace return gas recovery system according to claim 2, further comprising a backup working line (19), wherein the backup working line (19) is in parallel relationship with the main working line (10), and wherein the backup working line (19) has the same configuration as the main working line (10).
6. The blast furnace return gas recovery system according to claim 1, further comprising a control unit, wherein the inlet instrument cluster (6) and the inlet valve (9) are both interlocked with the control unit, and wherein the inlet instrument cluster (6) comprises a gas composition detector, a pressure gauge, a flow gauge and a temperature gauge, and wherein the gas composition detector is capable of detecting whether the inlet pipeline (5) comprises O 2 。
7. The blast furnace return air gas recovery system according to claim 1, wherein the inlet end of the inlet pipeline (5) is communicated with the furnace mouth of the blast furnace (1), the inlet pipeline (5) is further provided with a dust remover (2), a first ripple compensator (7) and a silencer (8), the dust remover (2) is positioned between the inlet end of the inlet pipeline (5) and the inlet instrument cluster (6), the first ripple compensator (7) is positioned between the inlet instrument cluster (6) and the inlet valve (9), and the silencer (8) is positioned between the first ripple compensator (7) and the inlet valve (9).
8. The blast furnace double wind gas recovery system according to claim 1, wherein the outlet end of the outlet pipeline (17) is communicated with the clean gas pipe network (4), an outlet pressure gauge (16), a second ripple compensator (18) and a check valve (3) are sequentially arranged on the outlet pipeline (17) along the direction from the inlet end of the outlet pipeline (17) to the outlet end of the outlet pipeline (17), and the blast furnace double wind gas recovery system further comprises a control unit, and the outlet pressure gauge (16) is interlocked with the control unit.
9. The blast furnace re-wind gas recovery method is characterized in that the blast furnace re-wind gas recovery method adopts the blast furnace re-wind gas recovery system according to claim 1, and the blast furnace re-wind gas recovery method sequentially comprises the following steps:
step 1, before the blast furnace is re-winded;
the inlet valve (9) is in a closed state, the gas pressurizing device (12) is opened, and the three-way switching valve (13) enables gas discharged by the gas pressurizing device (12) to return into the gas pressurizing device (12) through the loop (15);
step 2, in the process of re-wind starting of the blast furnace;
the re-wind gas discharged from the blast furnace (1) enters an inlet pipeline (5), an inlet instrument group (6) detects the re-wind gas, and when the inlet instrument group (6) detects that the inlet pipeline (5) contains O 2 When the muffler (8) is opened, the inlet valve (9) is in a closed state, and the air is discharged by the rebreathed gas; when the inlet instrument group (6) detects that the inlet pipeline (5) does not contain O 2 At the time of recovering the blast furnace re-wind, at the moment, closing the silencer (8), opening the inlet valve (9) and the working pipeline valve (11), and enabling the gas discharged by the gas pressurizing device (12) to enter the outlet pipeline (17) by switching the direction of the three-way switching valve (13), wherein re-wind gas in the outlet pipeline (17) enters the clean gas pipe network (4);
step 3, finishing the blast furnace re-blowing;
the three-way switching valve (13) switches the direction to enable the gas discharged by the gas pressurizing device (12) to return into the gas pressurizing device (12) through the loop (15), the gas pressurizing device (12) stops working gradually, the inlet valve (9) is closed, the muffler (8) is opened, and the residual gas is discharged to the air through the muffler (8).
10. The method for recovering blast furnace return air gas according to claim 9, wherein in step 2, in the process of recovering the blast furnace return air:
when the outlet pressure gauge (16) detects that the air pressure in the outlet pipeline (17) minus the air pressure in the net gas pipe network (4) is larger than or equal to a set value, the gas pressurizing device (12) operates at a low speed; when the outlet pressure gauge (16) detects that the air pressure in the outlet pipeline (17) minus the air pressure in the net gas pipe network (4) is smaller than the set value, the gas pressurizing device (12) operates at a high speed;
when the inlet instrument cluster (6) detects that the gas flow exceeds more than twice of the rated flow of the gas pressurizing device (12), or the main working pipeline (10) fails; -activating a standby working line (19);
when the recovery of the blast furnace is stopped, the three-way switching valve (13) switches the direction to enable the gas discharged by the gas pressurizing device (12) to return into the gas pressurizing device (12) through the loop (15), and the gas pressurizing device (12) reduces the rotating speed to a standby state;
when the decibel generated by the gas pressurizing device (12) is more than twice of the normal working decibel of the gas pressurizing device (12), the three-way switching valve (13) switches the direction to enable the gas exhausted by the gas pressurizing device (12) to return into the gas pressurizing device (12) through the loop (15);
when the inlet instrument group (6) detects that the air pressure in the inlet pipeline (5) is lower than one atmosphere, the blast furnace re-wind gas recovery system sends out low-pressure early warning, the blast furnace re-wind gas recovery system stops recovery, and the inlet valve (9) is closed;
when the inlet instrument group (6) detects that the inlet pipeline (5) contains O 2 When the blast furnace re-wind gas recovery system sends out oxygen early warning, the silencer (8) is opened, the inlet valve (9) is closed, the blast furnace re-wind gas recovery system stops recovering, and the gas in the inlet pipeline (5) is discharged to the air through the silencer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311325339.4A CN117344072A (en) | 2023-10-13 | 2023-10-13 | Blast furnace re-wind gas recovery system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311325339.4A CN117344072A (en) | 2023-10-13 | 2023-10-13 | Blast furnace re-wind gas recovery system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117344072A true CN117344072A (en) | 2024-01-05 |
Family
ID=89355428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311325339.4A Pending CN117344072A (en) | 2023-10-13 | 2023-10-13 | Blast furnace re-wind gas recovery system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117344072A (en) |
-
2023
- 2023-10-13 CN CN202311325339.4A patent/CN117344072A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110529422B (en) | Anti-surge control system of compressor | |
| CN111577400A (en) | Supercritical carbon dioxide turbine shaft end sealing method and device adopting dry gas coupling labyrinth sealing | |
| WO2010115338A1 (en) | Zero-disturbance switching method for pipeline transportation standby pump | |
| CN109519231B (en) | Expansion generator system and method controlled by staged starting | |
| CN111304409A (en) | RH vacuum refining system and using method thereof | |
| CN117344072A (en) | Blast furnace re-wind gas recovery system and method | |
| CN117344074A (en) | System and method for recovering blast furnace damping down gas | |
| CN114876851B (en) | Air suspension fan control system | |
| CN110714804A (en) | Bypass control system suitable for CAES system expansion unit | |
| CN212958779U (en) | System for eliminating blowing phenomenon of steam turbine intermediate pressure cylinder | |
| CN212956732U (en) | Intelligent compensation water supply system | |
| CN114960831A (en) | Mute energy-saving non-negative pressure full-variable-frequency water supply equipment | |
| CN111502775B (en) | Nitrogen sealing system and method for turbine expander with bearing box cooling | |
| JP4008151B2 (en) | Rotary compressor shaft seal system | |
| CN217997227U (en) | Oxygen generating unit surplus utilization device and system | |
| CN112081635A (en) | Method and system for eliminating blowing phenomenon of steam turbine intermediate pressure cylinder | |
| CN108612570B (en) | Supercritical carbon dioxide impeller mechanical working medium replacement device and method adopting dry gas seal | |
| CN108087322B (en) | Lubricating system of turbine compressor unit | |
| CN111258359A (en) | Automatic air supplement and exhaust system of hydraulic power plant high-pressure oil tank based on PLC control | |
| CN205012411U (en) | Energy -conserving silence remote control's water supply equipment | |
| CN214660377U (en) | Thrust balance auxiliary device of steam turbine set | |
| CN212864834U (en) | RH vacuum refining system | |
| CN215927795U (en) | Small-flow high-lift vertical multistage centrifugal pump | |
| CN215891248U (en) | Device for preventing axial compressor air duct outlet check valve from being unable to be opened | |
| CN220151570U (en) | Magnetic suspension high-speed centrifugal acetylene and vinyl chloride compressor unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |