CN103822223B - Unit pulverized-coal system realizes control system and the method thereof of coal dust uniform distribution - Google Patents
Unit pulverized-coal system realizes control system and the method thereof of coal dust uniform distribution Download PDFInfo
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- CN103822223B CN103822223B CN201410092130.2A CN201410092130A CN103822223B CN 103822223 B CN103822223 B CN 103822223B CN 201410092130 A CN201410092130 A CN 201410092130A CN 103822223 B CN103822223 B CN 103822223B
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Abstract
The invention discloses control system and method thereof that a kind of unit pulverized-coal system realizes coal dust uniform distribution, its method comprises the following steps: measure the coal dust flow velocity obtained in each coal dust carrier pipe and coal powder density in real time; The pulverized coal mass flow in each coal dust carrier pipe is calculated according to pulverized coal mass flow=fine coal concentration × coal dust flow velocity × coal dust carrier pipe cross-sectional area; Be arranged on the aperture of choke valve in each coal dust carrier pipe by adjustment, make the pulverized coal flow speed deviation often organized between coal dust carrier pipe be less than ± 5%; Be arranged on the angle of coal powder density adjustable plate in every platform coal pulverizer pulverized coal distributor by adjustment, make pulverized coal mass flow deviation between each coal dust carrier pipe be less than ± 10%.The present invention, realizes implementing monitoring to the direct-on-line of coal powder density and coal dust flow velocity, coal dust flow velocity and mass flow is all controlled in effective deviation, thus, realize the effect that unit pulverized-coal system realizes coal dust uniform distribution.
Description
Technical field
The present invention relates to large coal-fired power plant coal powder boiler combustion control field, be specifically related to control system and method thereof that unit pulverized-coal system realizes coal dust uniform distribution.
Background technology
The coal pulverizer of large coal-fired power plant pulverized-coal fired boiler generally adopts unit pulverized-coal system to provide coal dust for burner, and the quantity often organizing burner corresponding to every platform coal pulverizer is 4 ~ 8.According to boiler design codes and standards, each group burner between pulverized coal mass flow distribute deviation be less than ± 10%.Determine that the principal element of coal powder distribation deviation has flow resistance deviation between coal dust carrier pipe, coal powder density deviation, fineness of pulverized coal and a coal-air ratio.After fineness of pulverized coal and a coal-air ratio reach prescribed limit, coal powder distribation leveling will be carried out by regulating coal dust flow velocity and concentration.
But in the past, due to on-line measurement cannot be carried out to the pulverized coal mass flow in coal dust Dual-Phrase Distribution of Gas olid, therefore can only coal dust be replaced to carry out coal powder distribation leveling with air under cold conditions operating mode, the leveling method of this backwardness finally can cause quite high pulverized coal flow to distribute deviation, reach as high as ± 30 ~ ± 50%.This not only affects the safe operation of boiler, is also unfavorable for the discharge reducing coal consumption and pollutant.
Summary of the invention
Technical problem to be solved by this invention solves existing unit pulverized-coal system cannot realize carrying out on-line measurement and adjustment to pulverized coal mass flow, to such an extent as to occur that pulverized coal flow distributes deviation large problem.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide the control system that a kind of unit pulverized-coal system realizes coal dust uniform distribution, comprising:
Flow monitoring unit, the coal dust flow velocity in each coal dust carrier pipe of Real-Time Monitoring;
Concentration monitor unit, the coal powder density in each coal dust carrier pipe of Real-Time Monitoring;
Adjustment processing unit, according to coal dust flow velocity and the coal powder density of each coal dust carrier pipe, obtain the pulverized coal mass flow of each coal dust carrier pipe, and export corresponding control signal, adjustment is arranged on the aperture of the choke valve in each coal dust carrier pipe and is arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control coal dust flow velocity between each coal dust carrier pipe and mass flow deviation be less than respectively ± 5% and ± 10%, wherein, the pulverized coal mass flow Q=coal powder density ρ × coal dust flow velocity V × coal dust carrier pipe cross-sectional area S of each coal dust carrier pipe.
In such scheme, described flow monitoring unit comprises the upstream and downstream sensor be arranged in coal dust carrier pipe, first, second electrostatic signal that described adjustment processing unit produces in flow process according to the coal dust of described upstream and downstream sensor Real-Time Monitoring respectively, obtain coal dust flow velocity V, wherein, the time difference Tm between first, second electrostatic signal of distance L/ between the sensor of coal dust flow velocity V=upstream and downstream.
In such scheme, described upstream and downstream sensor adopts electrostatic transducer.
In such scheme, described concentration monitor unit comprises and is arranged on Microwave emission sensor in coal dust carrier pipe and microwave receiving sensor, described adjustment processing unit obtains coal powder density ρ according to ρ=△ f × k, wherein, △ f is resonant frequency variable quantity, △ f=f1-f2, f1 is that coal dust carrier pipe is not having the first resonant frequency of microwave signal under pulverized coal conveying state, f2 is that coal dust carrier pipe is having the second resonant frequency of microwave signal under pulverized coal conveying state, k is frequency concentration factor, according to the raw coal input quantity that the feeder on coal pulverizer records, coal dust flow velocity in each coal dust carrier pipe, coal powder density and f1 and f2, k value is demarcated.
Present invention also offers the control method that a kind of unit pulverized-coal system realizes coal dust uniform distribution, comprise the following steps:
Step 1, measure the coal dust flow velocity that obtains in each coal dust carrier pipe and coal powder density in real time;
Step 2, the pulverized coal mass flow calculated according to pulverized coal mass flow=fine coal concentration × coal dust flow velocity × coal dust carrier pipe cross-sectional area in each coal dust carrier pipe;
Step 3, be arranged on the aperture of choke valve in each coal dust carrier pipe according to pulverized coal mass flow adjustment and be arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control coal dust flow velocity between each coal dust carrier pipe and mass flow deviation be less than respectively ± 5% and ± 10%.
In such scheme, in step 1, obtain described coal dust flow velocity by the upstream and downstream sensor measurement be arranged in coal dust carrier pipe, concrete steps are as follows:
Step 11, to be obtained first, second electrostatic signal that coal dust produces in flow process respectively by described upstream and downstream sensor;
Step 12, employing crosscorrelation computational methods obtain the time difference Tm between first, second electrostatic signal;
Step 13, obtain coal dust flow velocity V according to V=L/Tm, wherein: L is the distance between the sensor of upstream and downstream.
In such scheme, in step 1, by being arranged on Microwave emission sensor in coal dust carrier pipe and microwave receiving sensor measurement obtains described coal powder density, concrete steps are as follows:
Step 21, measure the resonant frequency f1 of the microwave signal under coal dust carrier pipe does not have pulverized coal conveying state;
Step 22, measure the resonant frequency f2 of microwave signal under coal dust carrier pipe pulverized coal conveying state;
Step 23, calculate coal powder density according to ρ=△ f × k, wherein: ρ is coal powder density; △ f is resonant frequency variable quantity, △ f=f1-f2; K is frequency concentration factor, and coal dust flow velocity, coal powder density and f1 and f2 in the raw coal input quantity recorded according to the feeder on coal pulverizer, each coal dust carrier pipe, demarcate k value.
The present invention, control system and the method thereof of coal dust uniform distribution is realized by unit pulverized-coal system, realize implementing monitoring to the direct-on-line of coal powder density and coal dust flow velocity, and by the automatic adjustment of choke valve and coal powder density adjustable plate, coal powder density and coal dust flow velocity are all controlled in effective deviation, thus realize the effect that the overall coal dust automatic average of coal pulverizer distributes, and simplify the course of work, improve operating efficiency, meanwhile, also improve the safe operation of coal pulverizer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below the present invention is described in detail.
The invention provides the control system that a kind of unit pulverized-coal system realizes coal dust uniform distribution, comprise flow monitoring unit, concentration monitor unit and adjustment processing unit.
As shown in Figure 1, wherein, the coal dust flow velocity in each coal dust carrier pipe 1 of flow monitoring unit Real-Time Monitoring; Coal powder density in each coal dust carrier pipe 1 of concentration monitor unit Real-Time Monitoring; Adjustment processing unit 2 is according to the coal dust flow velocity of each coal dust carrier pipe 1 and coal powder density, obtain the pulverized coal mass flow of each coal dust carrier pipe, and export corresponding control signal, adjustment is arranged on the aperture of the choke valve 3 in each coal dust carrier pipe and is arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control coal dust flow velocity between each coal dust carrier pipe and mass flow deviation be less than respectively ± 5% and ± 10%, wherein, the pulverized coal mass flow Q=coal powder density ρ × coal dust flow velocity V × coal dust carrier pipe cross-sectional area S of each coal dust carrier pipe.
Flow monitoring unit comprises the upstream and downstream sensor 5,6 be arranged in coal dust carrier pipe, first, second electrostatic signal that adjustment processing unit produces in flow process according to the coal dust of upstream and downstream sensor 5,6 Real-Time Monitoring respectively, obtain coal dust flow velocity V, wherein, the time difference Tm between first, second electrostatic signal of distance L/ between the sensor of coal dust flow velocity V=upstream and downstream.Upstream and downstream sensor adopts electrostatic transducer.
Concentration monitor unit comprises the coal powder density sensor 7 be arranged in coal dust carrier pipe, i.e. Microwave emission sensor and microwave receiving sensor, adjustment processing unit obtains coal powder density ρ according to ρ=△ f × k, wherein, △ f is resonant frequency variable quantity, △ f=f1-f2, f1 is that coal dust carrier pipe is not having the first resonant frequency of microwave signal under pulverized coal conveying state, f2 is that coal dust carrier pipe is having the second resonant frequency of microwave signal under pulverized coal conveying state, k is frequency concentration factor, according to the raw coal input quantity that the feeder on coal pulverizer records, coal dust flow velocity in each coal dust carrier pipe, coal powder density and f1 and f2, k value is demarcated.
Present invention also offers the control method that a kind of unit pulverized-coal system realizes coal dust uniform distribution, comprise the following steps:
Step 1, measure the coal dust flow velocity that obtains in each coal dust carrier pipe and coal powder density in real time;
Step 2, the pulverized coal mass flow calculated according to pulverized coal mass flow=fine coal concentration × coal dust flow velocity × coal dust carrier pipe cross-sectional area in each coal dust carrier pipe;
Step 3, be arranged on the aperture of choke valve in each coal dust carrier pipe according to pulverized coal mass flow adjustment and be arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control coal dust flow velocity between each coal dust carrier pipe and mass flow deviation be less than respectively ± 5% and ± 10%.
Wherein, in step 1, coal dust flow velocity is obtained by the upstream and downstream sensor measurement be arranged in coal dust carrier pipe, the sensor employing electrostatic transducer that upstream and downstream are used, its electrostatic transducer is bar-shaped, and made by the wear-resistant metal material conducted electricity, concrete steps are as follows:
Step 11, to be obtained first, second electrostatic signal that coal dust produces in flow process respectively by upstream and downstream sensor;
Step 12, employing crosscorrelation computational methods obtain the time difference Tm between first, second electrostatic signal;
Step 13, obtain coal dust flow velocity V according to V=L/Tm, wherein: L is the distance between the sensor of upstream and downstream.
According to the size of the choke valve in the whole each coal dust carrier pipe of pulverized coal flow velocity modulation, make the pulverized coal flow speed deviation between each coal dust carrier pipe be less than ± 5%.
Wherein, in step 1, by being arranged on Microwave emission sensor in coal dust carrier pipe and microwave receiving sensor measurement obtains coal powder density, concrete steps are as follows:
Step 21, measure the resonant frequency f1 of the microwave signal under coal dust carrier pipe does not have pulverized coal conveying state;
Step 22, measure the resonant frequency f2 of microwave signal under coal dust carrier pipe pulverized coal conveying state;
Step 23, calculate coal powder density according to ρ=△ f × k, wherein: ρ is coal powder density; △ f is resonant frequency variable quantity, △ f=f1-f2; K is frequency concentration factor, carries out demarcation in advance obtain according to coal dust flow velocity, coal powder density and f1 and f2 in the raw coal input quantity of coal pulverizer, each coal dust carrier pipe to coal pulverizer.Adopt microwave resonance measuring principle, the resonant frequency size of the microwave signal of reception is directly proportional to the coal powder density in coal dust carrier pipe, and coal powder density is higher, and resonant frequency is lower.
As follows by the method for coal pulverizer spot frequency concentration factor k:
(1) claimed evenly to coal pulverizer coal supply by belt, and claim by the belt on belt conveyor the raw coal input quantity M measuring a period of time (as 10 minutes) interior coal pulverizer;
(2) the coal dust flow velocity V of every root coal dust carrier pipe is measured
jwith corresponding resonant frequency f1
j, resonant frequency f2
j;
(3) according to formula:
calculate k value.S
jfor the sectional area of coal dust carrier pipe, j=1 ~ n, n are the quantity of coal dust carrier pipe on every platform coal pulverizer.
The present invention, control system and the method thereof of coal dust uniform distribution is realized by unit pulverized-coal system, realize implementing monitoring to the direct-on-line of coal powder density and coal dust flow velocity, and by the automatic adjustment of choke valve and coal powder density adjustable plate, make coal powder density and coal dust flow velocity all be controlled in effective deviation, thus, realize the effect that the overall coal dust automatic average of coal pulverizer distributes, and simplify the course of work, improve operating efficiency, meanwhile, the safe operation of coal pulverizer is also improved.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structure change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (5)
1. unit pulverized-coal system realizes the control system of coal dust uniform distribution, it is characterized in that, comprising:
Flow monitoring unit, the coal dust flow velocity in each coal dust carrier pipe of Real-Time Monitoring;
Concentration monitor unit, the coal powder density in each coal dust carrier pipe of Real-Time Monitoring, described concentration monitor unit comprises and is arranged on Microwave emission sensor in coal dust carrier pipe and microwave receiving sensor;
Adjustment processing unit, according to coal dust flow velocity and the coal powder density of each coal dust carrier pipe, obtain the pulverized coal mass flow of each coal dust carrier pipe, and export corresponding control signal, adjustment is arranged on the aperture of the choke valve in each coal dust carrier pipe and is arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control coal dust flow velocity between each coal dust carrier pipe and mass flow deviation be less than respectively ± 5% and ± 10%, wherein, the pulverized coal mass flow Q=coal powder density ρ × coal dust flow velocity V × coal dust carrier pipe cross-sectional area S of each coal dust carrier pipe, described adjustment processing unit obtains coal powder density ρ according to ρ=△ f × k, wherein, △ f is resonant frequency variable quantity, △ f=f1-f2, f1 is that coal dust carrier pipe is not having the first resonant frequency of microwave signal under pulverized coal conveying state, f2 is that coal dust carrier pipe is having the second resonant frequency of microwave signal under pulverized coal conveying state, k is frequency concentration factor, according to the raw coal input quantity that the feeder on coal pulverizer records, coal dust flow velocity in each coal dust carrier pipe, coal powder density and f1 and f2, k value is demarcated.
2. unit pulverized-coal system as claimed in claim 1 realizes the control system of coal dust uniform distribution, it is characterized in that, described flow monitoring unit comprises the upstream and downstream sensor be arranged in coal dust carrier pipe, first, second electrostatic signal that described adjustment processing unit produces in flow process according to the coal dust of described upstream and downstream sensor Real-Time Monitoring respectively, obtain coal dust flow velocity V, wherein, the time difference Tm between first, second electrostatic signal of distance L/ between the sensor of coal dust flow velocity V=upstream and downstream.
3. unit pulverized-coal system as claimed in claim 2 realizes the control system of coal dust uniform distribution, it is characterized in that, described upstream and downstream sensor adopts electrostatic transducer.
4. unit pulverized-coal system realizes the control method of coal dust uniform distribution, it is characterized in that comprising the following steps:
Step 1, measure the coal dust flow velocity that obtains in each coal dust carrier pipe and coal powder density in real time;
Step 2, the pulverized coal mass flow Q calculated according to pulverized coal mass flow Q=fine coal concentration ρ × coal dust flow velocity V × coal dust carrier pipe cross-sectional area S in each coal dust carrier pipe;
Step 3, be arranged on the aperture of choke valve in each coal dust carrier pipe according to coal dust flow velocity and pulverized coal mass flow adjustment and be arranged on the angle of the coal powder density adjustable plate in coal pulverizer pulverized coal distributor, control the coal dust flow velocity in each coal dust carrier pipe and coal powder density, make coal dust flow velocity and mass flow deviation between each coal dust carrier pipe be less than respectively ± 5% and ± 10%;
By being arranged on Microwave emission sensor in coal dust carrier pipe and microwave receiving sensor measurement obtains described coal powder density, concrete steps are as follows:
Step 21, measure the resonant frequency f1 of the microwave signal under coal dust carrier pipe does not have pulverized coal conveying state;
Step 22, measure the resonant frequency f2 of microwave signal under coal dust carrier pipe pulverized coal conveying state;
Step 23, calculate coal powder density according to ρ=△ f × k, wherein: ρ is coal powder density; △ f is resonant frequency variable quantity, △ f=f1-f2; K is frequency concentration factor, and coal dust flow velocity, coal powder density and f1 and f2 in the raw coal input quantity recorded according to feeder on coal pulverizer, each coal dust carrier pipe, demarcate k value.
5. unit pulverized-coal system as claimed in claim 4 realizes the control method of coal dust uniform distribution, and it is characterized in that, in step 1, obtain described coal dust flow velocity by the upstream and downstream sensor measurement be arranged in coal dust carrier pipe, concrete steps are as follows:
Step 11, to be obtained first, second electrostatic signal that coal dust produces in flow process respectively by described upstream and downstream sensor;
Step 12, employing crosscorrelation computational methods obtain the time difference Tm between first, second electrostatic random signal;
Step 13, obtain coal dust flow velocity V according to V=L/Tm, wherein: L is the distance between the sensor of upstream and downstream.
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| CN105627344B (en) * | 2014-11-28 | 2018-10-12 | 国家电网公司 | Stoppage in transit self checking method based on pulverized coal preparation system and device |
| CN106290585A (en) * | 2015-06-09 | 2017-01-04 | 南京中能瑞华电气有限公司 | Ultrasonic method coal powder density measurement data handling system based on pipeline processes |
| CN106290562A (en) * | 2015-06-09 | 2017-01-04 | 南京中能瑞华电气有限公司 | Ultrasonic method coal powder density measurement data handling system based on parallel processing |
| CN105402764A (en) * | 2015-09-18 | 2016-03-16 | 中电投河南电力有限公司技术信息中心 | Pulverized coal flow speed and concentration leveling method based on air and powder on-line monitoring |
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| CN110631975B (en) * | 2019-11-20 | 2020-03-10 | 南京科远智慧科技集团股份有限公司 | Primary air online concentration measurement method based on electrostatic method |
| CN112763388A (en) * | 2021-01-20 | 2021-05-07 | 南京聚控智能科技有限公司 | Online monitoring system and method for concentration deviation between coal mill powder conveying pipelines |
| CN113109227A (en) * | 2021-05-28 | 2021-07-13 | 西安热工研究院有限公司 | Device and method for monitoring coal powder concentration deviation by using laser transmission method |
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