CN207004891U - A kind of blast furnace blower reverse current protection device - Google Patents
A kind of blast furnace blower reverse current protection device Download PDFInfo
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- CN207004891U CN207004891U CN201720856938.2U CN201720856938U CN207004891U CN 207004891 U CN207004891 U CN 207004891U CN 201720856938 U CN201720856938 U CN 201720856938U CN 207004891 U CN207004891 U CN 207004891U
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- differential pressure
- blast furnace
- furnace blower
- protection device
- throat
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Abstract
The utility model discloses a kind of blast furnace blower reverse current protection device, and the protection device includes：Three differential pressure switches and at least one controller；Three differential pressure switches are fixed on the throat of blast furnace blower, and at least one controller is connected with three differential pressure switches, and is connected simultaneously with blast furnace blower, with the signal fed back according to three differential pressure switches, control the counterflow-preventing of blast furnace blower to protect system and switch.By three differential pressure switches of the throat for being arranged on the blast furnace blower while the throat pressure difference is detected, when flow is normal, and throat's pressure difference is more than pressure difference switch setting value, the contact of differential pressure switch normal work, i.e. differential pressure switch is closure；When flow is smaller, and throat's pressure difference is less than differential pressure switch setting value, the contact of differential pressure switch disconnects, and one zero delivery signal of generation is sent into counterflow-preventing protection system, starts counterflow-preventing protection system work, so as to prevent the situation of adverse current from occurring.
Description
Technical field
It the utility model is related to steel blast furnace smelting process technical field, more particularly to a kind of blast furnace blower reverse current protection
Device.
Background technology
Blast furnace blower is as the system to blast furnace air feed, life of its stable operation to guarantee blast furnace or even whole steel plant
Production is normally of great significance.
Adverse current is the most dangerous operating mode of air blower, and the main reason for forming adverse current is the further development of surge, i.e. complete cycle
Blade air separation causes the capacity of blower fan and pressure at expulsion drastically to decline, if pipe network capacity is very big, ductwork pressure will not be with
Decline, thus form the pressure at expulsion that ductwork pressure is more than blower fan, form the capacity of blower fan by decent zero and become negative, be i.e. pipe network
Gas adverse current is aweather flow backwards in body.Damage of the adverse current to Fan Equipment is very big, easily cause personal security hidden danger or
Equipment fault.
Utility model content
The application provides a kind of blast furnace blower reverse current protection device, solves the gas that surge in the prior art causes pipe network
Body aweather flows backwards adverse current in body, easily cause the technical problem of equipment fault and personal security hidden danger.
The application provides a kind of blast furnace blower reverse current protection device, and the protection device includes：Three differential pressure switches and
At least one controller；
Wherein, three differential pressure switches are fixed on the throat of the blast furnace blower, at least one controller with
Three differential pressure switches connection, and be connected simultaneously with the blast furnace blower, with what is fed back according to three differential pressure switches
Signal, the counterflow-preventing of the blast furnace blower is controlled to protect system and switch.
Preferably, the number of the controller is three, and three controllers connect with three differential pressure switches respectively
Connect, and be connected simultaneously with the blast furnace blower.
Preferably, the protection device also includes three power supplys, three power supplys respectively with three differential pressure switches, with point
Wei not three differential pressure switch power supplies.
Preferably, on the same section for the throat that three differential pressure switches are arranged at the blast furnace blower, described section
Face is vertical with the wind direction of the throat.
Preferably, three differential pressure switches are arranged on the vertical direction in the section.
The application has the beneficial effect that：
By three differential pressure switches (P1, P2, P3) of the throat for being arranged on the blast furnace blower while detect the larynx
Portion's differential pressure, when flow is normal, and throat's pressure difference is more than pressure difference switch setting value, differential pressure switch normal work, i.e. differential pressure switch
Contact be closure；When flow is smaller, and throat's pressure difference is less than differential pressure switch setting value, the contact of differential pressure switch disconnects,
Generate a zero delivery signal and be sent into counterflow-preventing protection system, start counterflow-preventing protection system work, so as to prevent the situation of adverse current
Occur, solve surge in the prior art and cause the gas of pipe network aweather to flow backwards adverse current in body, easily cause equipment fault and
The technical problem of personal security hidden danger.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are only that this practicality is new
Some embodiments of type.
Fig. 1 is a kind of structural representation of blast furnace blower reverse current protection device of the better embodiment of the application one；
Fig. 2 is the position view of the differential pressure switch of the blast furnace blower reverse current protection device in Fig. 1；
Fig. 3 is the control logic block diagram of the blast furnace blower reverse current protection device in Fig. 1.
Embodiment
The embodiment of the present application solves surge in the prior art and made by providing a kind of blast furnace blower reverse current protection device
Gas into pipe network aweather flows backwards adverse current in body, easily cause the technical problem of equipment fault and personal security hidden danger.
Technical scheme in the embodiment of the present application is above-mentioned technical problem, and general thought is as follows：
By three differential pressure switches (P1, P2, P3) of the throat for being arranged on the blast furnace blower while detect the larynx
Portion's differential pressure, when flow is normal, and throat's pressure difference is more than pressure difference switch setting value, differential pressure switch normal work, i.e. differential pressure switch
Contact be closure；When flow is smaller, and throat's pressure difference is less than differential pressure switch setting value, the contact of differential pressure switch disconnects,
Generate a zero delivery signal and be sent into counterflow-preventing protection system, start counterflow-preventing protection system work, so as to prevent the situation of adverse current
Occur, solve surge in the prior art and cause the gas of pipe network aweather to flow backwards adverse current in body, easily cause equipment fault and
The technical problem of personal security hidden danger.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
Technical scheme is stated to be described in detail.
Cause the gas of pipe network aweather to flow backwards adverse current in body to solve surge in the prior art, easily cause equipment event
The technical problem of barrier and personal security hidden danger, the application provide a kind of blast furnace blower reverse current protection device.
As depicted in figs. 1 and 2, the blast furnace blower reverse current protection device includes：Three differential pressure switches (P1, P2, P3),
Three controllers (K1, K2, K3).Wherein, three differential pressure switches are fixed on the throat of the blast furnace blower, described three
Controller (K1, K2, K3) is connected with three differential pressure switches (P1, P2, P3) respectively, and is connected simultaneously with the blast furnace blower
Connect, with the signal fed back according to three differential pressure switches, control the surge preventing system and switch of the blast furnace blower.
The reverse current protection system installs three differential pressure switches on blower fan, measure be blower fan throat's pressure difference.When
When flow is normal (when pressure difference is more than pressure difference switch setting value such as 12mbar), contact is closure；When flow is smaller, throat presses
When difference is less than setting value, contact disconnects, and signal is sent into counterflow-preventing protection system, starts counterflow-preventing protection system work.
In the present embodiment, when going wrong in order to avoid controller, influence to receive the testing result of differential pressure switch, because
This, is respectively provided with three controllers (K1, K2, K3), in other embodiments, can also only set a controller, together
Shi Yusan differential pressure switch (P1, P2, P3), blast furnace blower connection, can specifically be configured as needed.
Further, the blast furnace blower reverse current protection device also includes three power supplys (D1, D2, D3), described three
Power supply (D1, D2, D3) respectively with three differential pressure switches (P1, P2, P3), to be respectively that three differential pressure switches (P1, P2, P3) supply
Electricity, to avoid influenceing the work of three differential pressure switches (P1, P2, P3) after power failure.
Further, three differential pressure switches (P1, P2, P3) are arranged at same section of the throat of the blast furnace blower
On face, the section is vertical with the wind direction of the throat.
Also, three differential pressure switches (P1, P2, P3) are arranged on the vertical direction in the section.
By three differential pressure switches (P1, P2, P3) of the throat for being arranged on the blast furnace blower while detect the larynx
Portion's differential pressure, when flow is normal, and throat's pressure difference is more than pressure difference switch setting value, differential pressure switch normal work, i.e. differential pressure switch
Contact be closure；When flow is smaller, and throat's pressure difference is less than differential pressure switch setting value, the contact of differential pressure switch disconnects,
Generate a zero delivery signal and be sent into counterflow-preventing protection system, start counterflow-preventing protection system work, so as to prevent the situation of adverse current
Occur, solve surge in the prior art and cause the gas of pipe network aweather to flow backwards adverse current in body, easily cause equipment fault and
The technical problem of personal security hidden danger.
Differential pressure switch (P1, P2, P3) failure of the blast furnace blower throat can cause the blast furnace blower adverse current to be stopped
Machine, so as to influence to blow to blast furnace, influence blast fumance；Therefore the blast furnace blower is by 3 pieces of differential pressure switches of in-site installation,
(only two or three differential pressure switches damage, just adverse current shut down) output results of selecting 23 in program as order execution condition,
Prevent one of differential pressure switch from breaking down, and cause fan trouble to shut down.
When differential pressure switch acts, the signal for giving counterflow-preventing protection system is referred to as zero delivery signal, and system is connected to the signal
When send control action, action situation has following several types depending on the duration of zero delivery signal, as shown in Figure 3：
(1) if in 2S zero delivery blackout, and no longer occur in 20S afterwards, then at this moment only by anti-surge system
Atmospheric valve by normal Regulation against surge is opened appropriate aperture to eliminate surge by system, and by counter counts zero delivery number,
Warning system sends surge alarm signal.
(2) if after 2S, zero delivery signal does not disappear or 20S afterwards is interior and zero delivery signal occurs, then removes
Outside generation adverse current is alarmed, following control instruction will appear as well in flogic system：1. the quick standard-sized sheet of atmospheric valve, to eliminate surge rapidly
And adverse current；2. stator blade is retracted into rapidly minimum work Angle Position；3. fan outlet non-return valve positive closing.It is complete due to atmospheric valve
Open, it is expected to adverse current is eliminated, at this moment unit is in safe operation state, after technique recovers normal, then it is extensive by normal start-up procedure
It is multiple to be blown to technique.
(3) if surge (still suffering from zero delivery signal) can not still be eliminated by being opened in atmospheric valve in 6S, holding
While continuous adverse current stopping alarm, implement emergency shutdown.
The advantages of the utility model and good effect are：
(1) excessive detection device is not needed on hardware, carrying out three by three differential pressure switches selects two judgements, ensures signal
Detection is efficient, avoids influenceing measurement effect because adding analog signalses detection.
(2) corresponding effective protection measure is taken in different running statuses according to the principle that adverse current occurs, ensures blower fan
The stabilization of operation, it is ensured that the normal production of blast furnace or even whole steel plant.
(3) effective detection adverse current hidden danger, and adverse current Detection accuracy is improved, adopt an effective measure and avoid when sending adverse current
Personnel or equipment occur dangerous.
During use：
The 1st, differential pressure switch is installed
2nd, differential pressure switch is demarcated
①：Variable pressure source is connected to pressure gauge and high side pressure mouth
②：Ohmmeter is connected to C and NO ends
③：Pressure is raised, the reading of pressure gauge is paid attention to when closing of circuit
④：Slowly reduce pressure, the reading of pressure gauge is paid attention to when open circuit (contact disconnects when differential pressure is less than 15mbar)
⑤：Use screwdriver rotation set point adjustment terminal：Rise set point counterclockwise, reduces set point clockwise
⑥：Repeat step 3-5, until switch contact rises or falls the action of differential pressure set point what is required.
3rd, signal testing is carried out, ensures that differential pressure measuring is accurate
4th, reverse current protection program is write, reverse current protection flow is realized according to design requirement.
5th, test of reaching the standard grade is carried out, simulated touch differential pressure signal, detects reverse current protection system health.
Although having been described for preferred embodiment of the present utility model, those skilled in the art once know substantially
Creative concept, then other change and modification can be made to these embodiments.So appended claims are intended to be construed to wrap
Include preferred embodiment and fall into having altered and changing for the scope of the utility model.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model
New spirit and scope.So, if these modifications and variations of the present utility model belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these changes and modification.
Claims (5)
1. a kind of blast furnace blower reverse current protection device, it is characterised in that the protection device includes：Three differential pressure switches and extremely
A few controller；
Wherein, three differential pressure switches are fixed on the throat of the blast furnace blower, at least one controller with it is described
Three differential pressure switches connection, and being connected simultaneously with the blast furnace blower, with the signal fed back according to three differential pressure switches,
The counterflow-preventing of the blast furnace blower is controlled to protect system and switch.
2. protection device as claimed in claim 1, it is characterised in that the number of the controller is three, three controls
Device processed is connected with three differential pressure switches respectively, and is connected simultaneously with the blast furnace blower.
3. protection device as claimed in claim 1, it is characterised in that the protection device also includes three power supplys, and described three
Individual power supply respectively with three differential pressure switches, to be respectively the power supply of three differential pressure switches.
4. such as the protection device any one of claim 1-3, it is characterised in that three differential pressure switches are arranged at institute
State on the same section of the throat of blast furnace blower, the section is vertical with the wind direction of the throat.
5. protection device as claimed in claim 4, it is characterised in that three differential pressure switches are arranged in the perpendicular of the section
Nogata is upward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720856938.2U CN207004891U (en) | 2017-07-14 | 2017-07-14 | A kind of blast furnace blower reverse current protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720856938.2U CN207004891U (en) | 2017-07-14 | 2017-07-14 | A kind of blast furnace blower reverse current protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207004891U true CN207004891U (en) | 2018-02-13 |
Family
ID=61454125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720856938.2U Active CN207004891U (en) | 2017-07-14 | 2017-07-14 | A kind of blast furnace blower reverse current protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207004891U (en) |
-
2017
- 2017-07-14 CN CN201720856938.2U patent/CN207004891U/en active Active
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