CN109869339A - The anti-implosion control system of air-introduced machine gas approach and method - Google Patents
The anti-implosion control system of air-introduced machine gas approach and method Download PDFInfo
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- CN109869339A CN109869339A CN201910115091.6A CN201910115091A CN109869339A CN 109869339 A CN109869339 A CN 109869339A CN 201910115091 A CN201910115091 A CN 201910115091A CN 109869339 A CN109869339 A CN 109869339A
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Abstract
The present invention provides a kind of anti-implosion control system of air-introduced machine gas approach and methods, it include: pressure switch measuring device, for detecting the pressure value of air-introduced machine gas approach, when the pressure value of air-introduced machine gas approach is more than safe pressure value, on-off model is exported, the safe pressure value bears the larger value in pressure value and the setting transient state receiving pressure value of deduster multiplied by Margin coefficient for the setting transient state of air-introduced machine gas approach；Logic judgment module, for exporting trip signal when receiving on-off model；Air-introduced machine protective device, for controlling fan trip when receiving trip signal；Pressure simulation measuring device, when the pressure value of air-introduced machine gas approach is more than setting pressure alarm value, exports alarm signal for detecting the pressure value of air-introduced machine gas approach.The present invention can play a protective role to deduster and anti-blower gas approach.
Description
Technical field
The present invention relates to Thermal Energy and Power Engineering field more particularly to a kind of anti-implosion control systems of air-introduced machine gas approach
And method.
Background technique
Implosion refers to that after boiler main fuel trip or blower maloperation, pressure in the burner hearth strongly reduces, so that pot
Furnace burner hearth or back-end ductwork are collapsed due to the extruding by external pressure or are inhaled flat phenomenon.With unit capacity and
Parameter is gradually increased, and the area of furnace wall becomes larger, and is increasingly detrimental to bear the pressure difference of inside and outside gas, although can lead to
It crosses raising boiler jacket intensity and avoids such case, but cost can also increase considerably.
In recent years, more and more power plant units are configured with the environmental protection equipments such as denitrating flue gas, desulfurization and dedusting, these rings
The addition for protecting equipment so that the pressure loss from boiler export to chimney is increasing, so the pressure head of air-introduced machine be also required to
Increase.After cancelling bypass with desulphurization system simultaneously, for simplified system, reliability is improved, reduces air-introduced machine and pressurization wind
The investment of series operation bring and place waste of machine, many thermal power plants eliminate booster fan, by improved air-introduced machine gram
The system resistance of desulfurizer is taken, the pressure head some of also referred to as three-in-one air-introduced machine, three-in-one air-introduced machine has reached -11kPa.
But it is -8.7kPa that the conventional design transient state maximum of burner hearth and flue, which bears pressure (negative pressure), at present, so working as air inducing compressing head
It is easy to when excessively high so that the implosion more than design transient maximum receiving pressure (negative pressure) of the pressure of burner hearth or flue.
Currently, thermal power plant is in order to avoid boiler furnace implosion caused by boiler main fuel trip or blower maloperation, one
As be that pressure-head switch is installed in boiler furnace, be reduced to the minimum pressure of safe operation of the boiler when furnace pressure moment
When (negative pressure), the movement of furnace pressure protective switch, input signal makes fan trip to air-introduced machine control module, to avoid
Burner hearth generates implosion because pressure is too small.But the pressure-head switch of the program is mounted in boiler furnace, due to boiler
Flue distance before burner hearth and air-introduced machine postpones so the pressure-head switch has the protection of flue before air-introduced machine farther out
Effect.
Summary of the invention
The embodiment of the present invention proposes a kind of anti-implosion control system of air-introduced machine gas approach, to realize to preventing air-introduced machine from entering
The control of mouth flue implosion, and can play a protective role to deduster and anti-blower gas approach, which includes: that pressure is opened
Close measuring device, pressure simulation measuring device, logic judgment module and air-introduced machine protective device, wherein
Pressure switch measuring device and pressure simulation measuring device are set to deduster to the air-introduced machine between air-introduced machine
On gas approach；
The input terminal of pressure switch measuring device connects air-introduced machine gas approach, and output end is separately connected logic judgment mould
The input terminal of block；
The input terminal of pressure simulation measuring device connects air-introduced machine gas approach；
The output end of the input terminal connection logic judgment module of air-introduced machine protective device, output end connect air-introduced machine；
Pressure switch measuring device, for detecting the pressure value of air-introduced machine gas approach, in air-introduced machine gas approach
When pressure value is more than safe pressure value, on-off model is exported, the safe pressure value is the setting wink of air-introduced machine gas approach
State bears the larger value in pressure value and the setting transient state receiving pressure value of deduster multiplied by Margin coefficient；
Logic judgment module, for exporting trip signal when receiving on-off model；
Air-introduced machine protective device, for controlling fan trip when receiving trip signal；
Pressure simulation measuring device, for detecting the pressure value of air-introduced machine gas approach, in air-introduced machine gas approach
When pressure value is more than setting pressure alarm value, alarm signal is exported.
The embodiment of the present invention proposes that a kind of anti-implosion control method of air-introduced machine gas approach, this method are applied to above-mentioned air inducing
The anti-implosion control system of machine gas approach, to realize control to air-introduced machine gas approach implosion is prevented, and can to deduster and
Anti- blower gas approach plays a protective role, this method comprises:
Pressure switch measuring device detects the pressure value of air-introduced machine gas approach, in the pressure value of air-introduced machine gas approach
When more than safe pressure value, output on-off model to logic judgment module, the safe pressure value is air-introduced machine gas approach
Setting transient state bear the larger value in the setting transient state receiving pressure value of pressure value and deduster multiplied by Margin coefficient；
Logic judgment module is when receiving on-off model, output trip signal to air-introduced machine protective device；
Air-introduced machine protective device controls fan trip when receiving trip signal；
Pressure simulation measuring device is defeated when the pressure value for detecting air-introduced machine gas approach is more than setting pressure alarm value
Alarm signal out.
In embodiments of the present invention, pressure switch measuring device, for detecting the pressure value of air-introduced machine gas approach,
When the pressure value of air-introduced machine gas approach is more than safe pressure value, on-off model is exported, the safe pressure value is air-introduced machine
The setting transient state of gas approach bears the larger value in pressure value and the setting transient state receiving pressure value of deduster multiplied by allowance system
Number；Logic judgment module exports trip signal for receiving on-off model；Air-introduced machine protective device, for receiving
When to trip signal, fan trip is controlled；Pressure simulation measuring device, for detecting the pressure of air-introduced machine gas approach
Value exports alarm signal when the pressure value of air-introduced machine gas approach is more than setting pressure alarm value.In the embodiment of the present invention
In, air-introduced machine protective device is used for when receiving trip signal, controls fan trip, is realized to preventing air-introduced machine entrance
The control of flue implosion；The setting transient state that safe pressure value considers air-introduced machine gas approach simultaneously bears pressure value and deduster
Setting transient state bear pressure value, can play a protective role to deduster and anti-blower gas approach.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is boiler of power plant flue gas system basic flow chart；
Fig. 2 is the schematic diagram for the anti-implosion control system of air-introduced machine gas approach that the embodiment of the present invention proposes；
Fig. 3 is the flow chart of the anti-implosion control method of air-introduced machine gas approach in the embodiment of the present invention.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
The anti-implosion control system of air-introduced machine gas approach is mainly used in boiler of power plant flue gas system, and Fig. 1 is boiler of power plant
Flue gas system basic flow chart, as shown in Figure 1, fuel is in Boiler Furnace chamber inner combustion, the flue gas of generation by boiler horizontal gas pass,
The laggard selectable catalytic denitration system of back-end ductwork (Selective Catalytic Reduction, SCR), later flue gas
Smoke stack emission is finally entered into atmosphere using absorption tower is entered after three-in-one air-introduced machine by air preheater and deduster.
Fig. 2 is the schematic diagram for the anti-implosion control system of air-introduced machine gas approach that the embodiment of the present invention proposes, such as Fig. 2 institute
Show, which includes: pressure switch measuring device, pressure simulation measuring device, logic judgment module and air-introduced machine protection
Device, wherein
Pressure switch measuring device and pressure simulation measuring device are set to deduster to the air-introduced machine between air-introduced machine
On gas approach；
The input terminal of pressure switch measuring device connects air-introduced machine gas approach, and output end is separately connected logic judgment mould
The input terminal of block；
The input terminal of pressure simulation measuring device connects air-introduced machine gas approach；
The output end of the input terminal connection logic judgment module of air-introduced machine protective device, output end connect air-introduced machine；
Pressure switch measuring device, for detecting the pressure value of air-introduced machine gas approach, in air-introduced machine gas approach
When pressure value is more than safe pressure value, on-off model is exported, the safe pressure value is the setting wink of air-introduced machine gas approach
State bears the larger value in pressure value and the setting transient state receiving pressure value of deduster multiplied by Margin coefficient；
Logic judgment module, for exporting trip signal when receiving on-off model；
Air-introduced machine protective device, for controlling fan trip when receiving trip signal；
Pressure simulation measuring device, for detecting the pressure value of air-introduced machine gas approach, in air-introduced machine gas approach
When pressure value is more than setting pressure alarm value, alarm signal is exported.
In embodiments of the present invention, air-introduced machine protective device is used for when receiving trip signal, controls fan trip,
Realize the control to air-introduced machine gas approach implosion is prevented；Safe pressure value considers the setting of air-introduced machine gas approach simultaneously
Transient state bears pressure value and the setting transient state of deduster bears pressure value, can play guarantor to deduster and anti-blower gas approach
Shield effect.
When it is implemented, deduster design transient, which bears pressure, should choose the design data of deduster producer.
In one embodiment, pressure switch amount test device can have 3；
Logic judgment module is specifically used for: receiving 3 on-off models；If 3 on-off models at least 2 are not
Sky exports trip signal.
In one embodiment, Margin coefficient can be 0.9.
In one embodiment, setting pressure alarm value can be safe pressure value multiplied by Margin coefficient.
In one embodiment, the setting transient state of air-introduced machine gas approach bear pressure value can among following three most
Small value:
It dashes forward under setup pressure value, boiler of power plant nominal operating conditions under environment temperature under boiler of power plant nominal operating conditions
Send out boiler extinguishment when transient pressure value, air-introduced machine cold start when zero delivery corresponding pressure value.
The embodiment of the present invention also provides a kind of anti-implosion control method of air-introduced machine gas approach, and this method is applied to above-mentioned
The anti-implosion control system of air-introduced machine gas approach, Fig. 3 are the anti-implosion control method of air-introduced machine gas approach in the embodiment of the present invention
Flow chart, as shown in figure 3, this method comprises:
Step 301, the pressure value of pressure switch measuring device detection air-introduced machine gas approach, in air-introduced machine gas approach
Pressure value when being more than safe pressure value, for output on-off model to logic judgment module, the safe pressure value is air-introduced machine
The setting transient state of gas approach bears the larger value in pressure value and the setting transient state receiving pressure value of deduster multiplied by allowance system
Number；
Step 302, when receiving on-off model, output trip signal to air-introduced machine is protected to be filled logic judgment module
It sets；
Step 303, air-introduced machine protective device controls fan trip when receiving trip signal；
Step 304, pressure simulation measuring device is more than setting pressure report in the pressure value of detection air-introduced machine gas approach
When alert value, alarm signal is exported.
When it is implemented, 3 pressure switch measuring devices detect air inducing if pressure switch measures trial assembly and is equipped with 3
The pressure value of machine gas approach, when the pressure value for detecting air-introduced machine gas approach respectively is more than safe pressure value, output is opened
Signal is measured to logic judgment module in pass, and the safe pressure value is that the setting transient state of air-introduced machine gas approach is born pressure value and removed
The setting transient state of dirt device is born；Logic judgment module when receiving the on-off model of 3 pressure switch measuring devices, if
At least 2 when being not empty in 3 on-off models, output trip signal to air-introduced machine protective device.
In conclusion in embodiments of the present invention, air-introduced machine protective device is used for when receiving trip signal, and control is drawn
Blower tripping, realizes the control to air-introduced machine gas approach implosion is prevented；Safe pressure value considers air-introduced machine entrance simultaneously
The setting transient state of flue bears pressure value and the setting transient state of deduster bears pressure value, can be to deduster and anti-fans entrance cigarette
Road plays a protective role.Pressure simulation measuring device can detect the pressure value of air-introduced machine gas approach, in air-introduced machine entrance
When the pressure value of flue is more than setting pressure alarm value, alarm signal, electric power supply plant operations staff monitoring are exported.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (6)
1. a kind of anti-implosion control system of air-introduced machine gas approach characterized by comprising pressure switch measuring device, pressure
Power analog measurement device, logic judgment module and air-introduced machine protective device, wherein
Pressure switch measuring device and pressure simulation measuring device are set to deduster to the air-introduced machine entrance between air-introduced machine
On flue；
The input terminal of pressure switch measuring device connects air-introduced machine gas approach, and output end is separately connected logic judgment module
Input terminal；
The input terminal of pressure simulation measuring device connects air-introduced machine gas approach；
The output end of the input terminal connection logic judgment module of air-introduced machine protective device, output end connect air-introduced machine；
Pressure switch measuring device, for detecting the pressure value of air-introduced machine gas approach, in the pressure of air-introduced machine gas approach
When value is more than safe pressure value, on-off model is exported, the safe pressure value is that the setting transient state of air-introduced machine gas approach is held
The larger value in transient state receiving pressure value is set multiplied by Margin coefficient by pressure value and deduster；
Logic judgment module, for exporting trip signal when receiving on-off model；
Air-introduced machine protective device, for controlling fan trip when receiving trip signal；
Pressure simulation measuring device, for detecting the pressure value of air-introduced machine gas approach, in the pressure of air-introduced machine gas approach
When value is more than setting pressure alarm value, alarm signal is exported.
2. the anti-implosion control system of air-introduced machine gas approach as described in claim 1, which is characterized in that pressure switch measures examination
Device has 3；
Logic judgment module is specifically used for:
Receive 3 on-off models；
If 3 on-off models at least 2 are not sky, trip signal is exported.
3. the anti-implosion control system of air-introduced machine gas approach as described in claim 1, which is characterized in that Margin coefficient 0.9.
4. the anti-implosion control system of air-introduced machine gas approach as described in claim 1, which is characterized in that setting pressure alarm value
It is safe pressure value multiplied by Margin coefficient.
5. the anti-implosion control system of air-introduced machine gas approach as described in claim 1, which is characterized in that air-introduced machine gas approach
Set transient state bear pressure value as the minimum value among following three:
Happen suddenly pot under setup pressure value, boiler of power plant nominal operating conditions under environment temperature under boiler of power plant nominal operating conditions
Furnace put out a fire when transient pressure value, air-introduced machine cold start when zero delivery corresponding pressure value.
6. a kind of anti-implosion control method of air-introduced machine gas approach, which is characterized in that this method is applied to claim 1 to 5 times
The anti-implosion control system of air-introduced machine gas approach described in one, comprising:
Pressure switch measuring device detects the pressure value of air-introduced machine gas approach, is more than in the pressure value of air-introduced machine gas approach
When safe pressure value, output on-off model to logic judgment module, the safe pressure value is setting for air-introduced machine gas approach
The larger value in transient state receiving pressure value and the setting transient state receiving pressure value of deduster is determined multiplied by Margin coefficient；
Logic judgment module is when receiving on-off model, output trip signal to air-introduced machine protective device；
Air-introduced machine protective device controls fan trip when receiving trip signal；
Pressure simulation measuring device is when the pressure value for detecting air-introduced machine gas approach is more than setting pressure alarm value, output report
Alert signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910115091.6A CN109869339B (en) | 2019-02-14 | 2019-02-14 | System and method for controlling implosion prevention of draught fan inlet flue |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910115091.6A CN109869339B (en) | 2019-02-14 | 2019-02-14 | System and method for controlling implosion prevention of draught fan inlet flue |
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| CN109869339B CN109869339B (en) | 2020-09-11 |
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|---|---|---|---|---|
| US20120115095A1 (en) * | 2008-05-27 | 2012-05-10 | Honeywell International Inc. | Combustion blower control for modulating furnace |
| CN202101259U (en) * | 2011-06-28 | 2012-01-04 | 内蒙古电力勘测设计院 | Implosion-prevention flue gas system |
| CN103566747A (en) * | 2013-10-25 | 2014-02-12 | 广东电网公司电力科学研究院 | Interlocked protection control method for three-in-one induced draft fan between desulfurization system and main frame in 1045MW thermal power unit |
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