CN107338340A - A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge - Google Patents
A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge Download PDFInfo
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- CN107338340A CN107338340A CN201710117992.XA CN201710117992A CN107338340A CN 107338340 A CN107338340 A CN 107338340A CN 201710117992 A CN201710117992 A CN 201710117992A CN 107338340 A CN107338340 A CN 107338340A
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- blower fan
- coal
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- gas
- fan
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a kind of device for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge, including coal-gas recovering blower fan, the air inlet of coal-gas recovering blower fan is connected with air outlet by by-pass line, electric control valve is provided with by-pass line, connect and be provided with orifice flowmeter on the pipeline of coal-gas recovering air inlet, orifice flowmeter position is in before by-pass line, rotation-speed measuring device is installed, electric control valve, orifice flowmeter and rotation-speed measuring device are connected with DCS respectively on coal-gas recovering blower fan.In converter smelting production process; DCS is judged when rotating speed is less than surge rotating speed, it is believed that surge can occur for blower fan according to rotation speed of fan signal; DCS then controls electric control valve to open; flue gas is introduced from fan outlet and enters fans entrance, for maintaining rotation speed of fan, maintains rotation speed of fan to be more than surge rotating speed at least 50r/min; effectively to avoid blower fan surge; fan trouble rate is reduced, protects blower fan, improves service life of fan.
Description
Technical field
The present invention relates to a kind of device for preventing blower fan surge, and in particular to one kind is used to prevent RECOVERY OF CONVERTER GAS blower fan
The device of surge, the invention further relates to a kind of method for preventing RECOVERY OF CONVERTER GAS blower fan surge.
Background technology
In convertor steelmaking process, there is substantial amounts of CO etc. in the high-temperature flue gas that molten steel oxygen decarburization in smelting process is formed
Combustibles, after high-temperature flue gas carries out the techniques such as waste heat recovery, dedusting and dehydration through converter vapourization cooling system, possesses recovery
During condition, then this part high-temperature flue gas i.e. coal gas of converter is reclaimed, the requirement for meeting recovery condition is O in exhaust gas components2≤ 1% and
CO >=25%, high-temperature flue gas is then through ignition bleeding when not meeting recovery condition.Existing iron and steel enterprise's RECOVERY OF CONVERTER GAS blower fan
For frequency conversion fan, rotation speed of fan according in the converter smelting cycle exhaust gas volumn it is different and different, the pneumatic steelmaking cycle is about 45 points
Clock, oxygen blast cycle are about 15 minutes, and the time cycle for meeting RECOVERY OF CONVERTER GAS is about 13 minutes, because converter gas has necessarily
Toxicity, therefore whole process converter fan must all run, and to meet combustion chamber draft condition, prevent converter gas loss.
Therefore, it can be changed according to actual operating state, converter fume amount, discharge fume and drawn by RECOVERY OF CONVERTER GAS blower fan, work as exhaust gas volumn
Rotation speed of fan is smaller when few, and when exhaust gas volumn is more, rotation speed of fan is larger, but when RECOVERY OF CONVERTER GAS rotation speed of fan is in low speed fortune
During row section, rotating speed just occurs when being less than surge rotating speed (surge rotating speed refers to corresponding rotating speed when blower fan starts to occur surge)
Surge phenomenon, causes fan trouble rate to uprise, and hidden danger is brought to system safety operation.
The content of the invention
It is an object of the invention to provide a kind of device for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge, solve existing turn
There is surge in low speed traffic coverage in producer gas recovery blower fan, the problem of potential safety hazard be present.
It is a further object to provide a kind of method for preventing RECOVERY OF CONVERTER GAS blower fan surge.
The technical solution adopted in the present invention is a kind of device for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge, including
Coal-gas recovering blower fan, the air inlet of coal-gas recovering blower fan are connected with air outlet by by-pass line, and electricity is provided with by-pass line
Dynamic regulating valve, connects and orifice flowmeter is provided with the pipeline of coal-gas recovering air inlet, and orifice flowmeter position is in side
Before threading a pipe, rotation-speed measuring device, electric control valve, orifice flowmeter and tachometric survey dress are installed on coal-gas recovering blower fan
Put and be connected respectively with dcs.
The features of the present invention also resides in,
Electric control valve, orifice flowmeter and rotation-speed measuring device are connected by wired with dcs respectively.
Another technical scheme of the present invention is a kind of side for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge
Method, it is specifically based on the device for preventing RECOVERY OF CONVERTER GAS blower fan surge, and concrete structure is：Including coal-gas recovering blower fan,
The air inlet of coal-gas recovering blower fan is connected with air outlet by by-pass line, and electric control valve is provided with by-pass line, connection
Orifice flowmeter is provided with the pipeline of coal-gas recovering air inlet, orifice flowmeter position is in before by-pass line, coal
Rotation-speed measuring device is installed on gas recovery blower fan, electric control valve, orifice flowmeter and rotation-speed measuring device are respectively by having
Line is connected with dcs；
Specific method is：
Step 1, by measurement of fan speed measurement device and the rotation speed of fan signal of coal-gas recovering blower fan is gathered, passes through hole
Flowmeter measures and gathers flue gas flow signal, is then passed to dcs；
Step 2, when within the oxygen blast phase, dcs works as rotating speed according to the rotation speed of fan signal received, judgement
During more than surge rotating speed, surge can be avoided, electric control valve is closed；When at the end of the oxygen blast phase, dcs is sentenced
When disconnected rotation speed of fan is less than or equal to surge rotating speed, it is believed that surge can occur, dcs control electric control valve is opened,
Part of smoke is introduced from coal-gas recovering fan outlet and enters coal-gas recovering air inlet, for maintaining coal-gas recovering blower fan
The exhaust gas volumn of entrance, so as to maintain coal-gas recovering rotation speed of fan indirectly, and converter gas system process, motorized adjustment is not influenceed
The aperture size of valve, according to flue gas flow signal deciding, maintains rotation speed of fan to be more than surge rotating speed at least by dcs
50r/min, effectively to avoid blower fan surge.
The invention has the advantages that the present invention is used for the device and method for preventing RECOVERY OF CONVERTER GAS blower fan surge, lead to
Cross and set by-pass line that electric control valve, coal are set on by-pass line to connect the air inlet of coal-gas recovering blower fan and air outlet
Orifice flowmeter is set on the air inlet pipeline of gas recovery blower fan, orifice flowmeter position is in before by-pass line, meanwhile, give
Coal-gas recovering assembling rotation-speed measuring device；In converter smelting production process, dcs is according to the wind of feedback
Machine tach signal, judge when rotating speed is less than surge rotating speed, it is believed that surge can occur for blower fan, and dcs then controls side
Electric control valve on siphunculus is opened, and introducing part of smoke from fan outlet is again introduced into fans entrance, for maintaining blower fan
Rotating speed, while do not influence the exhaust gas components in pipe-line system and the atmosphere in converter burner hearth, the aperture size of electric control valve by
Dcs is more than surge rotating speed at least 50r/min according to flue gas flow signal deciding, maintenance rotation speed of fan, to have
Effect avoids blower fan surge, reduces fan trouble rate, protects blower fan, improves service life of fan.
Brief description of the drawings
Fig. 1 is the structural representation that the present invention is used to prevent the device of RECOVERY OF CONVERTER GAS blower fan surge；
Fig. 2 is the workflow schematic diagram of DCS in device of the present invention for preventing RECOVERY OF CONVERTER GAS blower fan surge.
In figure, 1. orifice flowmeters, 2. by-pass lines, 3. electric control valves, 4. coal-gas recovering blower fans, 5. tachometric surveies dress
Put, 6. ignition bleeding pipes.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The present invention is used to prevent the device of RECOVERY OF CONVERTER GAS blower fan surge, as shown in figure 1, including coal-gas recovering blower fan 4,
The air inlet of coal-gas recovering blower fan 4 is connected with air outlet by by-pass line 2, and electric control valve 3 is provided with by-pass line 2,
Orifice flowmeter 1 is provided with the pipeline of the air inlet of connection coal-gas recovering blower fan 4, the position of orifice flowmeter 1 is in by-pass line 2
Before, rotation-speed measuring device 5, electric control valve 3, orifice flowmeter 1 and rotation-speed measuring device are installed on coal-gas recovering blower fan 4
5 are connected by wired with dcs respectively.Dcs (Distributed Control System)
Abbreviation DCS.
A kind of method for preventing RECOVERY OF CONVERTER GAS blower fan surge, concretely comprise the following steps：
Step 1, measured by measurement of fan speed device 5 and gather the rotation speed of fan signal of coal-gas recovering blower fan 4, passed through
Orifice flowmeter 1 measures and gathers flue gas flow signal, is then passed to dcs；
Step 2, as shown in Fig. 2 when within the oxygen blast phase, dcs according to the rotation speed of fan signal received,
Judge when rotating speed is more than surge rotating speed, can avoid surge, electric control valve is closed；It is distributed when at the end of the oxygen blast phase
When control system judges that rotation speed of fan is less than or equal to surge rotating speed, it is believed that surge can occur, dcs control is electronic
Regulating valve is opened, and introducing part of smoke from coal-gas recovering fan outlet enters coal-gas recovering air inlet, for maintaining
The exhaust gas volumn of coal-gas recovering fans entrance, so as to maintain coal-gas recovering rotation speed of fan indirectly, and converter gas system is not influenceed
Technique, the aperture size of electric control valve, according to flue gas flow signal deciding, maintain rotation speed of fan big by dcs
In surge rotating speed at least 50r/min, effectively to avoid blower fan surge.
According to the operating experience of industrial enterprise's real work, there are shafting vibration and intrinsic frequency the reason for causing blower fan surge
Rate is overlapping two kinds, and solution can be corrected and (be added balance weight etc.) to shafting vibration by dynamic balancing, can disposably solve, typically in wind
Machine will solve before putting into operation.But vibrate caused by intrinsic frequency is overlapping and but can not disposably solve, because coal gas
The rotating speed of recovery blower fan is to change, periodically, and rotating speed causes the overlapping of intrinsic frequency, it can be considered that blower fan surge
Reason be due to exhaust gas volumn it is too small caused by, so can only avoid, can not eliminate, therefore, bypass pipe be introduced in the application.
Embodiment
Pneumatic steelmaking smelting cycle is about 45 minutes in this specific embodiment, and oxygen blow duration is about 15 minutes, coal-gas recovering
Time is about 13 minutes, and coal-gas recovering blower fan 4 is frequency conversion fan, and design speed 1380r/min, surge rotating speed is 600r/min.
Wherein orifice flowmeter 1 provides gas flow signal to DCS, and the rotation-speed measuring device 5 on coal-gas recovering blower fan 4 carries
Recovery rotation speed of fan signal give gas to DCS, the DCS gas treatments recovery rotation speed of fan signal of blower fan 4, and combines flow signal,
Opening amount signal feeds back to the electric control valve 3 on by-pass line 2, the teletransmission flow signal feedback flow of orifice flowmeter 1 compared with
Hour, the aperture of electric control valve 3 is larger, when the remote transfer signal feedback flow of orifice flowmeter 1 is larger, electric control valve 3
Aperture is smaller.The remote transfer signal Real-time Feedback flow of orifice flowmeter 1 works as conversion through being converted into the rotating speed of coal-gas recovering blower fan 4
Rotating speed and as the rotating speed measured by rotation-speed measuring device 5 also >=600r/min when, electric control valve 3 closes, when corrected spool speed≤
During 600r/min, electric control valve 3 is opened, and introducing part of smoke from coal-gas recovering fan outlet enters coal-gas recovering blower fan
Air inlet, for maintaining the exhaust gas volumn of coal-gas recovering fans entrance, so as to maintain coal-gas recovering rotation speed of fan, and not shadow indirectly
Ring converter gas system process, the aperture size of electric control valve 3 by dcs according to flue gas flow signal deciding,
Rotation speed of fan is maintained at least in 650r/min, effectively to avoid blower fan surge.
Because coal gas of converter carbon monoxide content is high, there is certain toxicity, reclaim coal gas of converter during oxygen blast, during not oxygen blast
In order to maintain converter negative pressure, prevent from turning inner flue gas of the stove loss, therefore, coal-gas recovering blower fan 4 is also being run, and now converter gas
Converter gas in pipeline does not possess coal-gas recovering condition, then by the igniting ignition bleeding of exhaust stack 6, but due to now flue gas
Amount is smaller, and the rotating speed of coal-gas recovering blower fan 4 is low, surge be present.In order to avoid the surge of coal-gas recovering blower fan 4, while coal gas is avoided to return
4 high rotating speed of machine of calling prisoners in after letting them out for exercise runs and causes negative pressure anomalous effects in converter to make steel quality, and the design of this bypass mode can go out from blower fan
Air port draws partial fume and is again introduced into blower fan air intake vent, improves rotation speed of fan, away from pumping point, moreover it is possible to avoids turning furnace pressure different
Often.In whole pipe-line system, there are the text of a text two and dedusting etc. before coal-gas recovering blower fan 4, have water seal after coal-gas recovering blower fan 4
Deng, therefore, the present invention in bypass set electric control valve 3 open when can't cause pressure anomaly in whole pipe-line system.
Claims (3)
1. a kind of be used to prevent the device of RECOVERY OF CONVERTER GAS blower fan surge, it is characterised in that including coal-gas recovering blower fan (4),
The air inlet of the coal-gas recovering blower fan (4) is connected with air outlet by by-pass line (2), is set on the by-pass line (2)
There is electric control valve (3), connect and be provided with orifice flowmeter (1), orifice flow on the pipeline of coal-gas recovering blower fan (4) air inlet
Meter (1) position is in before by-pass line (2), and rotation-speed measuring device (5) is provided with the coal-gas recovering blower fan (4), described
Electric control valve (3), orifice flowmeter (1) and rotation-speed measuring device (5) are connected with dcs respectively.
2. the device according to claim 1 for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge, it is characterised in that the electricity
Dynamic regulating valve (3), orifice flowmeter (1) and rotation-speed measuring device (5) are connected by wired with dcs respectively.
A kind of 3. method for preventing RECOVERY OF CONVERTER GAS blower fan surge, it is characterised in that it is specifically based on for anti-rotation stop
Producer gas reclaims the device of blower fan surge, and concrete structure is：Including coal-gas recovering blower fan (4), the coal-gas recovering blower fan (4)
Air inlet is connected with air outlet by by-pass line (2), and electric control valve (3) is provided with the by-pass line (2), connects coal
Orifice flowmeter (1) is provided with the pipeline of gas recovery blower fan (4) air inlet, orifice flowmeter (1) position is in by-pass line
(2) before, rotation-speed measuring device (5), the electric control valve (3), orifice flow are installed on the coal-gas recovering blower fan (4)
Meter (1) and rotation-speed measuring device (5) are connected by wired with dcs respectively；
Specific method is：
Step 1, measured by measurement of fan speed device (5) and gather the rotation speed of fan signal of coal-gas recovering blower fan (4), passed through
Orifice flowmeter (1) measures and gathers flue gas flow signal, is then passed to dcs；
Step 2, when within the oxygen blast phase, dcs is judged when rotating speed is more than according to the rotation speed of fan signal received
During surge rotating speed, surge can be avoided, electric control valve (3) is closed；When at the end of the oxygen blast phase, dcs judges
When rotation speed of fan is less than or equal to surge, it is believed that surge can occur, dcs control electric control valve (3) is opened, from
Coal-gas recovering fan outlet introduces part of smoke and enters coal-gas recovering air inlet, for maintaining coal-gas recovering blower fan
(4) rotating speed, the aperture size of electric control valve (3), according to flue gas flow signal deciding, maintain blower fan by dcs
Rotating speed is more than surge rotating speed at least 50r/min, effectively to avoid blower fan surge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117992.XA CN107338340A (en) | 2017-03-01 | 2017-03-01 | A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710117992.XA CN107338340A (en) | 2017-03-01 | 2017-03-01 | A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge |
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| Publication Number | Publication Date |
|---|---|
| CN107338340A true CN107338340A (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710117992.XA Pending CN107338340A (en) | 2017-03-01 | 2017-03-01 | A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge |
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| CN (1) | CN107338340A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762048A (en) * | 2019-11-27 | 2020-02-07 | 浙江富冶集团有限公司 | Control system of copper smelting converter fan |
| CN114754476A (en) * | 2022-03-31 | 2022-07-15 | 青岛海尔空调器有限总公司 | Air conditioner breathing control device and method and air conditioner system |
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| CN114754476A (en) * | 2022-03-31 | 2022-07-15 | 青岛海尔空调器有限总公司 | Air conditioner breathing control device and method and air conditioner system |
| CN114754476B (en) * | 2022-03-31 | 2024-03-22 | 青岛海尔空调器有限总公司 | Air conditioner wheeze control device and method and air conditioning system |
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Application publication date: 20171110 |
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| RJ01 | Rejection of invention patent application after publication |