CN108954285A - A kind of Automatic Control Strategy and method of biomass water cooling vibrating grate boiler load - Google Patents
A kind of Automatic Control Strategy and method of biomass water cooling vibrating grate boiler load Download PDFInfo
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- CN108954285A CN108954285A CN201811069571.5A CN201811069571A CN108954285A CN 108954285 A CN108954285 A CN 108954285A CN 201811069571 A CN201811069571 A CN 201811069571A CN 108954285 A CN108954285 A CN 108954285A
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- fuel
- main steam
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- furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
Abstract
The present invention relates to the Automatic Control Strategies and method of a kind of biomass water cooling vibrating grate boiler load, adjust the revolving speed of control frequency conversion feeding device as the load instruction signal of feeding controller using the deviation of the setting value of main steam enthalpy and actual value；According to the moisture for entering furnace fuel, grey fractional value, on the basis of designing the elemental composition of fuel, the elemental composition for actually entering furnace fuel for fitting meet demand, calculates the deviation of assumed load and actual load air output, as the major instruction signal for adjusting frequency conversion pressure fan revolving speed.The present invention has fully considered the characteristics of biomass fuel and water-cooling vibration furnace grate boiler plant, it uses main steam enthalpy to realize as load instruction signal precisely and in time to adjust, solve the problems, such as that fuel is multifarious with the fitting algorithm of biomass fuel component element, it solves the problems, such as in water-cooling vibration furnace grate boiler burning and feed there are certain hysteresis quality with " section fertilizer ratio ", is a kind of science, effective control strategy and method.
Description
Technical field
The present invention relates to biomass boiler applied technical fields, and are more particularly related to a kind of biomass water cooling vibration
The Automatic Control Strategy and method of dynamic furnace grate load.
Background technique
Biomass energy is the energy for being only second to coal, oil gas and natural gas and occuping world energy sources total quantity consumed the 4th
Source plays a very important role in energy resource system.In Chinese development agricultural-forestry biomass thermoelectricity industry, rural area both can solve
Open Burning Crop Residue bring atmosphere polluting problem can also solve county domain resident and clean for warm power demands, solve simultaneously
The local farmers problem of employment realizes accurate poverty alleviation, is the rising industry benefited the nation and the people.
Since putting into operation from Chinese First biomass power generation unit in 2006, agricultural-forestry biomass cogeneration of heat and power technology exists
China has developed more than ten years, and still, unit automatic control level is but extremely low, mostly uses manually control greatly.In particular, by
In entering, furnace fuel type is many and diverse, and combustion characteristics difference is big, and boiler load adjustment relies on manual control to complete.
Currently, the Automatic Control Strategy and method of coal-burning boiler load adjustment are technically very mature.But due to
Combustion process of the combustion characteristics and same fuel of biomass fuel not of the same race under the conditions of different in moisture and ash content exist compared with
Big difference, and biomass is burnt in water-cooling vibration furnace grate boiler and there are certain hysteresis qualitys for feed, so, in biomass
The trial carried out on boiler referring to coal-burning boiler load curtailment strategy, does not succeed.Currently, can satisfy agricultural-forestry biomass
The Automatic Control Strategy and method of water-cooling vibration furnace grate boiler load adjustment are still blank at home.
Summary of the invention
The present invention is in view of the above-mentioned problems, be designed to provide a kind of regulation side of biomass water cooling vibrating grate boiler load
Method can solve the problem of prior art lacks the adjust automatically control of biomass water cooling vibrating grate boiler load.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
Embodiment of the invention discloses a kind of Automatic Control Strategy of biomass water cooling vibrating grate boiler load and sides
Method, comprising:
It is adjusted and is controlled as the load instruction signal of feeding controller using the deviation of the setting value of main steam enthalpy and actual value
The revolving speed of frequency conversion feeding device processed；
According to enter the moisture of furnace fuel, grey fractional value fits meet demand on the basis of designing the elemental composition of fuel
The elemental composition for actually entering furnace fuel, calculate the deviation of assumed load and actual load air output, as adjust frequency conversion give
The major instruction signal of rotation speed of fan.
Further, using the deviation of oxygen amount setting value and actual value as the auxiliary instruction for adjusting frequency conversion pressure fan revolving speed
Signal.
Further, the calculation method of the main steam enthalpy are as follows: using main steam pressure, main steam temperature as process
Parameter calculates unit mass enthalpy by the operation function of vapor enthalpy, multiplied by main steam flow, obtains main steam enthalpy.
Further, the main steam flow, main steam pressure, main steam temperature are to be set according to external load demand
It is fixed.
Further, the calculation method of the phosphorus content of the elemental composition for actually entering furnace fuel are as follows:
In formula: Car--- fitting enters phosphorus content under furnace fuel As-received；
Mar、Aar--- enter moisture and ash content under furnace fuel industry analysis As-received；
Car,0、Mar,0、Aar,0--- phosphorus content, moisture and ash content under design fuel As-received；
In the calculation method of the elemental composition for actually entering furnace fuel, hydrogen content, oxygen content, nitrogen content and sulfur-bearing meter
Calculation method is identical as the calculation method of phosphorus content.
Further, it according to boiler thermodynamic calculation method, is calculated into furnace fuel consumption and theoretical air-supply total amount；
The practical air-supply total amount is equal to the product that oxygen amount actual value corresponds to excess air coefficient and theoretical air-supply total amount.
Further, the deviation of the oxygen amount setting value and actual value is to the coverage for adjusting frequency conversion pressure fan revolving speed
The 5-10% of existing frequency conversion pressure fan revolving speed.
Further, when the actual value of oxygen amount it is higher than setting value 6% when, be latched frequency conversion air-supply machine controller, stop
Increase air output；When the actual value of oxygen amount it is lower than setting value 2.5% when, locking feeding controller, stop increase feeding coal.
Further, it converts the active power to obtain main steam flow according to the specific steam consumption of generating set and set, root
It is set according to the moisture of furnace natural fuel Industrial Analysis, ash content is entered as fuel moisture and fuel ash.
Further, setting manually sets dialog box on DCS, realizes to main steam flow, main steam pressure, main steam
The setting of the numerical value of temperature, fuel moisture and fuel ash, meanwhile, using high limit and lower bound function to setting in configuration logic
Numerical value validity differentiated.
The beneficial effects of the present invention are:
(1) Automatic Control Strategy and method of biomass water cooling vibrating grate boiler load of the invention have fully considered life
The characteristics of biomass fuel and water-cooling vibration furnace grate boiler plant, uses main steam enthalpy that main steam flow is replaced to believe as load instruction
It number realizes more accurate and timely adjusting, solves that fuel is multifarious to ask with the fitting algorithm of biomass fuel component element
Topic solves the problems, such as that burning and feed are there are certain hysteresis quality in water-cooling vibration furnace grate boiler with " section fertilizer ratio "
A kind of Automatic Control Strategy and method of scientific, effective water-cooling vibration furnace grate boiler load adjustment, it is other to agricultural-forestry biomass
Type boilers also have certain adaptability.
(2) control strategy of the invention and method have succeeded in a certain agricultural-forestry biomass water-cooling vibration furnace grate boiler thermoelectricity
It is used on coproduction unit, has been resolved the problem of boiler load can not be put into automatically, filled up the sky of this domestic technical aspect
It is white.
(3) present invention will greatly reduce the labor intensity of operator, significant increase biomass cogeneration units from
Dynamicization is horizontal, creates condition for the construction of intelligent biology matter steam power plant.
Detailed description of the invention
Fig. 1 is the automatic control logic schematic diagram that the water-cooling vibration furnace grate boiler load of one embodiment of the invention adjusts；
Fig. 2 is the DCS picture figure of one embodiment of the invention；
Fig. 3 is the part Logical Configuration figure of one embodiment of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
One embodiment of the invention discloses a kind of regulation method of biomass water cooling vibrating grate boiler load comprising:
It is adjusted and is controlled as the load instruction signal of feeding controller using the deviation of the setting value of main steam enthalpy and actual value
The revolving speed of frequency conversion feeding device processed；
According to enter the moisture of furnace fuel, grey fractional value fits meet demand on the basis of designing the elemental composition of fuel
The elemental composition for actually entering furnace fuel, calculate the deviation of assumed load and actual load air output, as adjust frequency conversion give
The major instruction signal of rotation speed of fan.
In above-described embodiment, the method that boiler heating power and burning calculate is introduced into control logic, main steaming is innovatively used
Parameter of the vapour enthalpy as accurate characterization boiler load, is made comparisons by setting value with actual value, deviation is as feed control
The load instruction signal of device controls the revolving speed of frequency conversion feeding device to adjust；The fitting for establishing biomass fuel component element is calculated
Method, according to enter the different in moisture of furnace fuel, grey fractional value fits on the basis of designing the elemental composition of fuel and meets engineering
Demand actually enters the elemental composition of furnace fuel, and then calculates the deviation of the air output of assumed load and actual load, this is partially
Difference is as the major instruction signal for adjusting frequency conversion pressure fan revolving speed, it is preferable that is made using the deviation of oxygen amount setting value and actual value
For the auxiliary command signal for adjusting frequency conversion pressure fan revolving speed；The theory for breaking through constant " coal-air ratio " of coal-burning boiler, establishes symbol
The concept of " the section fertilizer ratio " of symphysis biomass fuel characteristic, using the high-low limits of oxygen amount as feeding controller and air blowing control
The barring condition of device, it is ensured that enter the full combustion of furnace fuel.
In some embodiments of the present invention, on the basis of the above embodiments, the calculation method of the main steam enthalpy are as follows:
Using main steam pressure, main steam temperature as procedure parameter, unit mass enthalpy is calculated by the operation function of vapor enthalpy
Value, multiplied by main steam flow, obtains main steam enthalpy.Wherein, the main steam flow, main steam pressure, main steam temperature are
It is set according to external load demand.I.e. main steam flow, pressure, the setting value of temperature are by operations staff according to external load
Demand is set.It is made comparisons by the setting value of main steam enthalpy with actual value, deviation is as the negative of feeding controller (PID)
Lotus command signal controls the revolving speed of frequency conversion feeding device to adjust.
In some embodiments of the present invention, on the basis of the above embodiments, actually enter containing for the elemental composition of furnace fuel
The calculation method of carbon amounts are as follows:
In formula: Car--- fitting enters phosphorus content under furnace fuel As-received；
Mar、Aar--- enter moisture and ash content under furnace fuel industry analysis As-received；
Car,0、Mar,0、Aar,0--- phosphorus content, moisture and ash content under design fuel As-received；
In the calculation method of the elemental composition for actually entering furnace fuel, hydrogen content, oxygen content, nitrogen content and sulfur-bearing meter
Calculation method is identical as the calculation method of phosphorus content.Control strategy disclosed in case study on implementation i.e. of the present invention and the biomass fuel of method
The fitting algorithm of component element is to analyze resulting moisture (Mar) and ash content (Aar) numerical value according to situ industrial, according to above-mentioned public affairs
Formula is fitted the elemental composition being calculated into furnace fuel.
It on the basis of the above embodiments, for theory air-supply total amount, is calculated according to boiler thermodynamic calculation method
Enter furnace fuel consumption and theoretical air-supply total amount；Oxygen amount setting value is got according to oxygen amount numerical value is corresponded under different load, and practical
Air-supply total amount is equal to the product that oxygen amount actual value corresponds to excess air coefficient and theoretical air-supply total amount.And then calculate assumed load
And the deviation of the air output of actual load, this deviation is as the major instruction signal for adjusting frequency conversion pressure fan revolving speed.
In some embodiments of the present invention, the deviation of the oxygen amount setting value and actual value is to adjusting frequency conversion pressure fan revolving speed
Coverage be existing frequency conversion pressure fan revolving speed 5-10%.This is because oxygen amount be boiler internal burning whether good one
A mark illustrates that combustion conditions are deteriorated, then must increase pressure fan revolving speed, increase and enter if practical oxygen amount is lower than setting value
Boiler air amount；If practical oxygen amount is higher than setting value, illustrates that too many air capacity enters boiler, needs to reduce pressure fan revolving speed,
Otherwise boiler thermal efficiency can be reduced；But according to the actual conditions of field adjustable, influence of the oxygen amount variable quantity to air output is basic
Between 5-10%, if influenced, the value is too large, and pressure fan revolving speed will fluctuate widely；If influenced, the value is too small, wind
Machine rotation speed change is unable to satisfy the requirement of the actually required air capacity of boiler combustion.
Method disclosed by the embodiments of the present invention, " section fertilizer ratio " are lagged with water-cooling vibration furnace grate boiler combustion and feed
Characteristic be consistent, may be configured as when the actual value of oxygen amount it is higher than setting value 6% when, be latched the frequency conversion pressure fan control
Device stops increasing air output；When the actual value of oxygen amount it is lower than setting value 2.5% when, locking feeding controller, stop increase feed
Amount.Using the high-low limits of oxygen amount as the barring condition of feeding controller and air blowing control device, it is ensured that enter the abundant combustion of furnace fuel
It burns.Both certain excess air coefficient can be kept, realizes the relatively stable of " fertilizer ratio ", and guarantees biomass fuel in boiler
In full combustion.
In some embodiments of the present invention, active power is converted to obtain main steam flow according to the specific steam consumption of generating set
It is set, is set according to the moisture of furnace natural fuel Industrial Analysis, ash content is entered as fuel moisture and fuel ash.Tool
Body, it can be arranged on DCS and manually set dialog box, realize to main steam flow, main steam pressure, main steam temperature, fuel
The setting of the numerical value of moisture and fuel ash, meanwhile, had using high limit and lowest limit function to the numerical value of setting in configuration logic
Effect property is differentiated.
Embodiment 1
As shown in attached drawing 1- Fig. 3, a dialog box manually set for operations staff is set on DCS picture, respectively
Including main steam flow, main vapour pressure, Stream temperature degree, fuel moisture and fuel ash.In configuration logic, using high limit, lower bound
Function come differentiate operations staff input numerical value validity.Operations staff is according to the specific steam consumption of Turbo-generator Set by active power
Conversion is main steam flow, and according to the moisture for entering furnace natural fuel Industrial Analysis, ash content is as fuel moisture and ash content.
It is tested according to boiler design specification or combustion adjustment, can get the best oxygen of (main steam flow) under different load
Magnitude.So calculating the oxygen amount value under different load by polygronal function f (x0).
Main steam flow, main vapour pressure, Stream temperature degree setting value calculate boiler master by vapor enthalpy function f (x1)
Steam set enthalpy, equally, main steam flow, main vapour pressure, Stream temperature degree operation actual value pass through vapor enthalpy function f
(x1) boiler main steam practical enthalpy is calculated to turn feeding device after the deviation of the two will enter feeding controller PID arithmetic
Speed is adjusted, and is controlled into furnace fuel quantity.
According to the setting value for entering furnace fuel moisture, ash content, according to the fitting algorithm function f of biomass fuel component element
(x2), the elemental constituent for actually entering furnace fuel is calculated, is calculated according to biomass fuel calorific value function f (x3) and enters and leaves furnace fuel receipts
To base Lower heat value, theoretical air requirement is calculated according to boiler combustion function f (x4).
Main feedwater flow, main feed pressure, main feed temperature actual value calculate by vapor enthalpy function f (x1)
The practical enthalpy of the main water supply of boiler, then with boiler main steam setting enthalpy, enter furnace fuel As-received Lower heat value by f (x5) meter
Calculating, which reaches, enters furnace fuel quantity needed for assumed load.And then it is calculated with oxygen amount setting value, theoretical air requirement by multiplying
Reach assumed load required air quantity.The deviation of assumed load required air quantity and air blower inlet amount of actual air for combustion, as master
After wanting signal to enter air blowing control device PID arithmetic, pressure fan revolving speed is adjusted.Oxygen amount setting value is inclined with operation actual value
Difference enters air blowing control device PID as auxiliary signal, and air capacity deviation is adjusted control to pressure fan revolving speed together.
Meanwhile in order to keep reasonable " section fertilizer ratio ", it is ensured that fuel completely burned, when oxygen amount is higher than 6%, locking
Air-supply machine controller stops increasing air output；When oxygen amount is lower than 2.5%, it is latched feeding controller, stops increasing feeding coal.
The foregoing is merely presently preferred embodiments of the present invention, practical range not for the purpose of limiting the invention；If do not taken off
It from the spirit and scope of the present invention, modifies or equivalently replaces the present invention, should all cover in the claims in the present invention
In protection scope.
Claims (10)
1. a kind of Automatic Control Strategy and method of biomass water cooling vibrating grate boiler load characterized by comprising
Control is adjusted as the load instruction signal of feeding controller using the deviation of the setting value of main steam enthalpy and actual value to become
The revolving speed of frequency feeding device；
According to enter the moisture of furnace fuel, grey fractional value fits the reality of meet demand on the basis of designing the elemental composition of fuel
Border enters the elemental composition of furnace fuel, calculates the deviation of assumed load and actual load air output, as adjusting frequency conversion pressure fan
The major instruction signal of revolving speed.
2. the method according to claim 1, wherein using the deviation of oxygen amount setting value and actual value as adjusting
The auxiliary command signal of frequency conversion pressure fan revolving speed.
3. the method according to claim 1, wherein the calculation method of the main steam enthalpy are as follows: use main steaming
Steam pressure, main steam temperature calculate unit mass enthalpy by the operation function of vapor enthalpy, multiplied by master as procedure parameter
Steam flow obtains main steam enthalpy.
4. according to the method described in claim 3, it is characterized in that, the main steam flow, main steam pressure, main steam temperature
To be set according to external load demand.
5. the method according to claim 1, wherein the phosphorus content of the elemental composition for actually entering furnace fuel
Calculation method are as follows:
In formula: Car--- fitting enters phosphorus content under furnace fuel As-received；
Mar、Aar--- enter moisture and ash content under furnace fuel industry analysis As-received；
Car,0、Mar,0、Aar,0--- phosphorus content, moisture and ash content under design fuel As-received；
In the calculation method of the elemental composition for actually entering furnace fuel, hydrogen content, oxygen content, nitrogen content and sulfur content calculating side
Method is identical as the calculation method of phosphorus content.
6. the method according to claim 1, wherein being calculated and being fired into furnace according to boiler thermodynamic calculation method
Expect consumption and theoretical air-supply total amount；
The practical air-supply total amount is equal to the product of the corresponding excess air coefficient of oxygen amount actual value and theoretical air-supply total amount.
7. according to the method described in claim 2, it is characterized in that, the deviation of the oxygen amount setting value and actual value becomes adjusting
The coverage of frequency pressure fan revolving speed is the 5-10% of existing frequency conversion pressure fan revolving speed.
8. the method according to claim 1, wherein when the actual value of oxygen amount it is higher than setting value 6% when, be latched institute
Frequency conversion air-supply machine controller is stated, stops increasing air output；When the actual value of oxygen amount it is lower than setting value 2.5% when, locking feed control
Device processed stops increasing feeding coal.
9. the method according to claim 1, wherein the specific steam consumption according to generating set converts active power
It is set to main steam flow, according to the moisture for entering furnace natural fuel Industrial Analysis, ash content is as fuel moisture and fuel ash
Divide and is set.
10. realizing according to the method described in claim 9, manually setting dialog box it is characterized in that, being arranged on DCS to master
Steam flow, main steam pressure, main steam temperature, fuel moisture and fuel ash numerical value setting, meanwhile, in configuration logic
It is middle that the numerical value validity of setting is differentiated using high limit and lower bound function.
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Cited By (1)
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| CN113339307A (en) * | 2021-06-28 | 2021-09-03 | 浙江邦业科技股份有限公司 | Method for controlling rotating speed of high-temperature fan of rotary cement kiln based on excess air coefficient |
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Effective date of registration: 20190428 Address after: 050600 East of Guangming Road, North of Xinhe Street, Xingtang County, Shijiazhuang City, Hebei Province Applicant after: Zhongdian Hangtang Biomass Energy Thermal Power Co., Ltd. Address before: No. 49 Fuxing Road, Haidian District, Beijing, 100141 Applicant before: China Electronic Systems Technology Co., Ltd. |
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