CN104976637A - Method for calculating cold air leakage amount of inlet of coal mill for thermal power generation boiler - Google Patents
Method for calculating cold air leakage amount of inlet of coal mill for thermal power generation boiler Download PDFInfo
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Abstract
The invention provides a method for calculating the cold air leakage amount of an inlet of a coal mill for a thermal power generation boiler. The method comprises the step that the cold air leakage amount of the inlet of the coal mill satisfies the formula: F1=Fh*(Th*Ch-Tr*Cr)/(T1*C1-Tr*Cr), wherein F1 is set to be the cold air leakage amount of the inlet of the coal mill, Fh is set to be the mixed air amount of the inlet of the coal mill, Th is set to be the temperature of mixed air of the inlet of the coal mill, Ch is set to be the constant-pressure specific heat capacity of the inlet of the coal mill, Tr is set to be the temperature of hot air of the inlet of the coal mill, Cr is set to be the constant-pressure specific heat capacity of the hot air of the inlet of the coal mill, T1 is set to be the temperature of cold air of the inlet of the coal mill, and C1 is set to be the constant-pressure specific heat capacity of the cold air of the inlet of the coal mill. The standard regulation quantity of an air door baffle at a cold air inlet of the coal mill of a direct blowing type coal pulverizing system is provided, the internal leakage amount of cold air of the direct blowing type coal pulverizing system is reduced, the drying capacity of the coal mill is increased, the exhaust gas temperature of the boiler is effectively lowered, and the standard regulation quantity of the air door baffle at the cold air inlet of the coal mill of the direct blowing type coal pulverizing system is acquired not through a test value any longer, so the stability and safety of a boiler combustion system are improved, and the regulation efficiency of the air door baffle at the cold air inlet of the coal mill of the direct blowing type coal pulverizing system is improved.
Description
One, technical field
Patent of the present invention relates to a kind of computational methods of coal pulverizer inlet cold wind leakage rate, especially a kind of computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler.
Two, background technology
Security and the economy of thermal power plant unit operation depend primarily on steam generator system, and the factor affecting steam generator system safety in operation and economy is the pulverized coal preparation system of boiler fired coal, the task of thermal power plant pulverized coal preparation system is set to boiler provide quality and quantity all to meet the coal dust of combustion requirements.Existing thermal power generation corporations coal dust preparation system mainly divides and is set to following a few class: storage low speed coal mill system in (1); (2) straight-blowing double-inlet and double-outlet steel ball coal mill system; (3) direct-firing medium-speed pulverizer system.Because unit pulverized-coal system is used widely because its system layout is relatively simple, reliability is high, adapt to the strong advantage of coal ability;
For unit pulverized-coal system, coal pulverizer inlet cold wind leakage rate directly affects the drying capacity of coal pulverizer, cold wind leakage rate crosses the coal pulverizer inlet hot blast that senior general squeezes same volume, thus cause direct-fired mill drying capacity not enough, exhaust gas temperature is raised, boiler combustion will be affected time serious stablize and safety, control mainly there is following two problems in electric current in adjustment in each thermal power plant at direct-fired mill drying capacity: one unit pulverized-coal system belongs to positive-pressure type pulverized coal preparation system, for the ball type pulverizer system, the problem of leakage of unit pulverized-coal system valve and baffle plate is obvious, interior leakage problem performance is not obvious, be difficult to inline diagnosis and maintenance, its two simultaneously pressurized direct pulverizing coal system affect by design condition, cold wind pressure is higher than hot-blast pressure, and the cold wind leakage rate bringing coal pulverizer inlet cold air damper to wear and tear thus to cause is large,
In order to ensure the security of thermal power plant unit operation and improve its economy, coal pulverizer inlet cold wind leakage rate in thermal power generation boiler is calculated and controls tool and has very important significance, therefore the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler are a kind of important computational methods, also do not have now a kind of computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler.
Three, summary of the invention
In order to overcome above-mentioned technical disadvantages, the object of patent of the present invention is to provide a kind of computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler, therefore improve stability and the security of boiler combustion system, improve the adjustment efficiency of direct-fired mill cold air inlet damper.
In order to achieve the above object, the technical scheme that patent of the present invention is taked is: the steps include:
Application conditions: direct-fired mill runs and coal pulverizer electric current is greater than 25A and direct-fired mill entrance cold wind plate washer open degree feedback < 3%;
Fl=Fh×（Th×Ch-Tr×Cr）/（Tl×Cl-Tr×Cr），
Wherein:
Fl is set to coal pulverizer inlet cold wind leakage rate,
Fh is set to coal pulverizer inlet mixed air volume,
Th is set to coal pulverizer inlet mixing wind-warm syndrome,
Ch is set to coal pulverizer inlet mixing wind specific heat at constant pressure,
Tr is set to coal pulverizer inlet hot blast temperature,
Cr is set to coal pulverizer inlet hot blast specific heat at constant pressure,
Tl is set to coal pulverizer inlet cold wind temperature,
Cl is set to coal pulverizer inlet cold wind specific heat at constant pressure;
In the present embodiment, direct-fired mill entrance drying medium specific heat at constant pressure C=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5,
Wherein T is set to the Celsius temperature that drying medium is set to hot blast, mixing wind and cold wind respectively;
When T is set to the real time dynamic measurement celsius temperature scale that drying medium is mixing wind, Ch=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is hot blast, Cr=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is cold wind,
Cl=1.319+3.013/10^5×T+2.118/10^7×T^2-1.746/10^10×T^3+5.863/10^14×T^4-7.337/10^18×T^5；
In the present embodiment,
Fh is set to coal pulverizer inlet mixed air volume and is set to real time dynamic measurement value,
Th is set to coal pulverizer inlet mixing wind-warm syndrome and is set to real time dynamic measurement value,
Tr is set to coal pulverizer inlet hot blast temperature and is set to real time dynamic measurement value,
Tl is set to coal pulverizer inlet cold wind temperature and is set to real time dynamic measurement value.
Owing to devising the computational methods to direct-fired mill entrance cold wind leakage rate, provide the adjustment criteria amount of direct-fired mill cold air inlet damper, reduce leakage quantity in unit pulverized-coal system cold wind, improve drying capacity of pulverizer, effective reduction exhaust gas temperature, the adjustment criteria amount of direct-fired mill cold air inlet damper is no longer obtained by test value, therefore improve stability and the security of boiler combustion system, improve the adjustment efficiency of direct-fired mill cold air inlet damper.
The present invention devises, the programming of the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler for being implanted in the DCS control system unit pulverized-coal system control module of thermal power plant.
In technical scheme of the present invention, selected parameter will meet the conservation of mass and the heat conservation condition of pulverized coal preparation system ventilation, that is: the conservation of mass: the summation of the hot blast air quantity and cold wind air quantity that enter coal pulverizer equals the mixed air volume of coal pulverizer, heat conservation: the hot blast entering coal pulverizer brings the heat that summation that heat and cold wind brings heat into equals coal pulverizer mixing wind into.^ is the implication of " power ", in all kinds of engineering calculation software as: 3.013/10^5 is then expressed as 3.013/100000.
In the technical program, important technology feature is set to the air quantity of direct-fired mill, wind-warm syndrome and specific heat at constant pressure, in the technical field of the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler, have novelty, creativeness and practicality, the term in the technical program is all to make an explanation with patent document in the art and to understand.
Four, detailed description of the invention
Below in conjunction with embodiment, further describe the present invention, following examples are intended to the present invention instead of limitation of the invention further are described.
First embodiment of the present invention, technical scheme of the present invention, the steps include:
Application conditions: direct-fired mill runs and coal pulverizer electric current is greater than 25A and direct-fired mill entrance cold wind plate washer open degree feedback < 3%;
Fl=Fh×（Th×Ch-Tr×Cr）/（Tl×Cl-Tr×Cr），
Wherein:
Fl is set to coal pulverizer inlet cold wind leakage rate,
Fh is set to coal pulverizer inlet mixed air volume,
Th is set to coal pulverizer inlet mixing wind-warm syndrome,
Ch is set to coal pulverizer inlet mixing wind specific heat at constant pressure,
Tr is set to coal pulverizer inlet hot blast temperature,
Cr is set to coal pulverizer inlet hot blast specific heat at constant pressure,
Tl is set to coal pulverizer inlet cold wind temperature,
Cl is set to coal pulverizer inlet cold wind specific heat at constant pressure;
In the present embodiment, direct-fired mill entrance drying medium specific heat at constant pressure C=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5,
Wherein T is set to the Celsius temperature that drying medium is set to hot blast, mixing wind and cold wind respectively;
When T is set to the real time dynamic measurement celsius temperature scale that drying medium is mixing wind, Ch=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is hot blast, Cr=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is cold wind,
Cl=1.319+3.013/10^5×T+2.118/10^7×T^2-1.746/10^10×T^3+5.863/10^14×T^4-7.337/10^18×T^5；
In the present embodiment,
Fh is set to coal pulverizer inlet mixed air volume and is set to real time dynamic measurement value,
Th is set to coal pulverizer inlet mixing wind-warm syndrome and is set to real time dynamic measurement value,
Tr is set to coal pulverizer inlet hot blast temperature and is set to real time dynamic measurement value,
Tl is set to coal pulverizer inlet cold wind temperature and is set to real time dynamic measurement value;
By obtaining T value to the centigrade real time dynamic measurement of hot blast, mixing wind and cold wind, calculate Ch, Cr and Cl value, obtain Fh, Th, Tr and Tl value by real time dynamic measurement, calculate Fl value, controlled the combustion system of the boiler of thermal power plant unit by Fl value.
1000MW unit direct-fired mill model is BBD4360 coal pulverizer
| Project | Unit | Technical parameter (design coal) |
| Coal pulverizer model | BBD－4360 | |
| Pulverizer capacity (HGI=50, H2O=8%, 75% by 200 mesh sieves) | t/h | 70 |
| Cylindrical shell effective diameter | mm | 4250 |
| Cylindrical shell effective length | mm | 6140 |
| Drum speed | r/min | 16 |
| Cylindrical shell dischargeable capacity | m 3 | 87.1 |
| Maximum ball load | t | 92 |
| Sealing air quantity | kg/h | 4500 |
Before not adopting this enforcement, coal pulverizer inlet cold wind slip cannot be estimated online, after employing the present embodiment, coal pulverizer inlet cold wind slip is about about 10-15% to utilize this method to find, by to the transformation of multiple stage coal pulverizer inlet cold-air flap, cold wind slip is reduced to less than 3%, makes exhaust gas temperature reduce about about 3 DEG C, make unit generation coal consumption reduce about 0.4g/kWh, improve unit macroeconomic.
Patent of the present invention has lower feature:
1, owing to devising the computational methods to direct-fired mill entrance cold wind leakage rate, provide the adjustment criteria amount of direct-fired mill cold air inlet damper, reduce leakage quantity in unit pulverized-coal system cold wind, improve drying capacity of pulverizer, effective reduction exhaust gas temperature, the adjustment criteria amount of direct-fired mill cold air inlet damper is no longer obtained by test value, therefore improve stability and the security of boiler combustion system, improve the adjustment efficiency of direct-fired mill cold air inlet damper.
2, owing to devising the computational methods to direct-fired mill entrance cold wind leakage rate, by real time dynamic measurement, obtain dynamic coal pulverizer inlet cold wind leakage rate in real time, improve boiler combustion system reliability of operation energy.
3, owing to devising, the restriction of number range has been carried out to planform, make the technical characteristic that number range is set in the technical scheme of patent of the present invention, be not by formulae discovery or tested the technical characteristic drawn by limited number of time, test shows that the technical characteristic of this number range achieves good technique effect.
4, owing to devising the technical characteristic of patent of the present invention, in the effect of the set separately and each other of technical characteristic, shown by test, what the property indices of patent of the present invention was set to existing property indices is at least set to 1.7 times, has good market value by assessment.
Above-described embodiment is a kind of way of realization of the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler provided by the present invention; according to other distortion of scheme provided by the present invention; the composition increased or reduce wherein or step; or the present invention is used for other the technical field close with the present invention, all belongs to protection scope of the present invention.
Claims (2)
1. the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler; It is characterized in that: the steps include:
Application conditions: direct-fired mill runs and coal pulverizer electric current is greater than 25A and direct-fired mill entrance cold wind plate washer open degree feedback < 3%;
Fl=Fh×（Th×Ch-Tr×Cr）/（Tl×Cl-Tr×Cr），
Wherein:
Fl is set to coal pulverizer inlet cold wind leakage rate,
Fh is set to coal pulverizer inlet mixed air volume,
Th is set to coal pulverizer inlet mixing wind-warm syndrome,
Ch is set to coal pulverizer inlet mixing wind specific heat at constant pressure,
Tr is set to coal pulverizer inlet hot blast temperature,
Cr is set to coal pulverizer inlet hot blast specific heat at constant pressure,
Tl is set to coal pulverizer inlet cold wind temperature,
Cl is set to coal pulverizer inlet cold wind specific heat at constant pressure;
Direct-fired mill entrance drying medium specific heat at constant pressure C=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5,
Wherein T is set to the Celsius temperature that drying medium is set to hot blast, mixing wind and cold wind respectively;
When T is set to the real time dynamic measurement celsius temperature scale that drying medium is mixing wind, Ch=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is hot blast, Cr=1.319+3.013/10^5 × T+2.118/10^7 × T^2-1.746/10^10 × T^3+5.863/10^14 × T^4-7.337/10^18 × T^5;
When wherein T is set to the real time dynamic measurement celsius temperature scale that drying medium is cold wind,
Cl=1.319+3.013/10^5×T+2.118/10^7×T^2-1.746/10^10×T^3+5.863/10^14×T^4-7.337/10^18×T^5；
Fh is set to coal pulverizer inlet mixed air volume and is set to real time dynamic measurement value,
Th is set to coal pulverizer inlet mixing wind-warm syndrome and is set to real time dynamic measurement value,
Tr is set to coal pulverizer inlet hot blast temperature and is set to real time dynamic measurement value,
Tl is set to coal pulverizer inlet cold wind temperature and is set to real time dynamic measurement value.
2. the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler according to claim 1, is characterized in that: the programming of the computational methods for the coal pulverizer inlet cold wind leakage rate in thermal power generation boiler for being implanted in the DCS control system unit pulverized-coal system control module of thermal power plant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116085822A (en) * | 2023-03-07 | 2023-05-09 | 国家能源集团科学技术研究院有限公司 | Method, device, equipment and medium for calculating mixed air volume of coal mill inlet |
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