CN110057735A - A kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device - Google Patents
A kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device Download PDFInfo
- Publication number
- CN110057735A CN110057735A CN201910437253.8A CN201910437253A CN110057735A CN 110057735 A CN110057735 A CN 110057735A CN 201910437253 A CN201910437253 A CN 201910437253A CN 110057735 A CN110057735 A CN 110057735A
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- China
- Prior art keywords
- concentration
- size
- pulverized coal
- power
- power bar
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
Abstract
The invention belongs to the pneumatic conveying flow detection technical fields of coal dust, devise a kind of thermoelectricity station-service concentration of pulverized coal measurement method: using the power bar of load cell by the resistance formula of wind powder mixture in flow field:, in the shape of air hose, coal dust face power bar when flowing through pipeline areaAnd in situation known to First air wind speed, high-precision load cell measures the size of lower force measuring machine institute stress different in flow rate, can be in the hope of concentration of pulverized coal.The invention also discloses the measuring devices of the above-mentioned measurement method of application.Measuring device measures the size of two power using two high-precision load cells, acquires two force vectors and knows the size of suffered power；And in situation known to First air wind speed, size of the power bar in flow field by concentration known to the resistance formula of wind powder mixture is utilized.A kind of thermoelectricity station-service concentration of pulverized coal measurement method proposed by the present invention, can measure the concentration of pulverized coal of power plant boiler effectively in real time.
Description
Technical field
The invention belongs to the pneumatic conveying flow detection fields of coal dust, and in particular to a kind of thermoelectricity station-service First air coal dust is dense
Spend measurement method and measuring device.
Background technique
Current thermal power plant is typically all that coal cinder is worn into coal dust in coal pulverizer, is eventually sent to burn in boiler.
The air-supply for entering boiler in thermal power plant for carrying coal dust is known as First air, wind speed and coal dust in operation in primary air piping
Concentration is to influence the important parameter of stable combustion condition and boiler combustion efficiency in boiler.Each First air velocity in pipes of same layer
It is inconsistent with coal powder density, a series of detrimental effects can be generated to the operation of boiler, these detrimental effects mainly show
Burning circle of contact deflection in furnace, flame is adherent, furnace chamber thermic load is uneven, temperature deviation is big, discharge amount increases, generates causing
Local water-cooling wall overtemperature, coking phenomenon, cause the thermal deviation of superheater and reheater, lead to boiler flameout and induction accident etc. is each
A aspect.Accurate each level air-distribution of observing and controlling and coal powder density, can be greatly lowered concentration of emission, mitigate dirt of the power plant emission to environment
Dye.
The power bar of load cell is in flow field by the resistance of wind powder mixture, formula is as follows:
(1)
(2)
In formula (1),Coefficient magnitude is determined by the shape in pipeline flow field；Indicate the face of face power bar when coal dust flows through pipeline
Product；For the density size of wind powder mixture in certain temperature and pressure Fluid field；For the size of coal dust First air wind speed.
In formula (2),For power bar by the resistance of air in flow field；For power bar by the resistance of coal dust in flow field
Power.
The power bar of load cell is in flow field by the resistance of wind powder mixture, can be equivalent are as follows:
(3)
Then(4)
In formula (3) (4),It indicates in certain temperatureWith pressureDensity size (the kg/m of air in state Fluid field3)；Indicate concentration of pulverized coal (kg/m in flow field3).
The power bar of load cell is in flow field by the resistance of wind powder mixtureIn formulaIndicate certain temperature and
The density size of wind powder mixture in pressure Fluid field, the density size including air in certain temperature and pressure Fluid fieldWith
Concentration of pulverized coal in flow field。
According in equation for ideal gases, the density formula of air:
(5)
In formula (5),It indicates in certain temperatureWith pressureDensity size (the kg/m of air in state Fluid field3)；Table
Show 0 °, the density that pressure is air under 0.1013MPa state,=1.293kg/m3；It indicates absolute pressure (MPa)；It indicates thermodynamic temperature (K).
Summary of the invention
The present invention provides a kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device, solves First air coal dust
The measurement problem of concentration.According to the power bar of load cell by the resistance formula of wind powder mixture in flow field:
(1)
(2)
Measure the size of lower force measuring machine institute stress different in flow rate, in the size of known coal dust First air wind speedThe case where
Under, the density size of mixture in certain temperature and pressure Fluid field can be calculated, in certain temperature and pressure Fluid field
The density size of middle airUnder the premise of known, and then calculate concentration of pulverized coal in flow field。
The first purpose of the invention is to provide a kind of methods of thermoelectricity station-service concentration of pulverized coal measurement.Coal dust is in wind
It is conveyed in pipe by First air, in the shape of air hoseAnd the area of coal dust face power bar when flowing through pipelineIn known situation,
On the one hand high-precision load cell measures the size of lower force measuring machine institute stress different in flow rate, and another aspect speed measuring device is surveyed
The size for measuring coal dust primary air velocity, by the power bar of load cell by the resistance formula (1) of wind powder mixture in flow field
(2): the density size of mixture in certain temperature and pressure Fluid field can be pushed away to obtain；In certain temperature and pressure Fluid field
The density size of airUnder the premise of known, we can calculate concentration of pulverized coal in flow field。
A second object of the present invention is to provide a kind of measuring devices of thermoelectricity station-service concentration of pulverized coal measurement method.
The fixation of power bar is controlled in power transportation pipe in measuring device, and two high-precision load cells are connected with power bar, with couple
Counter balance torque, the torque for receiving single sensor are basically eliminated, and have both been avoided error caused by torque, have been in turn ensured entirety
The stabilization of structure, improves Mechanical Structure Strength.Two load cells measure two power、Size, acquire two force vectors
Measure and know flow resistance suffered by power barSize, i.e.,；In the situation known to First air wind speed, into
And calculate the size of concentration.
Detailed description of the invention
Fig. 1 is a kind of measuring device system schematic of thermoelectricity station-service concentration of pulverized coal measurement method.
Specific embodiment
It is as shown in Figure 1 a kind of measuring device system schematic of thermoelectricity station-service concentration of pulverized coal measurement method, packet
Include load cell 1,2 and power bar 3.Power bar is inserted into air duct in measuring device, and wind powder mixture, which streams, causes resistance, and power passes through power
Bar is passed to upside sensor side；The load cell of upside two measures two power、Size, acquire two force vectors
With i.e. known to flow resistance suffered by power barSize, i.e.,；In the situation known to First air wind speed, in turn
Calculate the size of concentration.
Claims (2)
1. a kind of thermoelectricity station-service concentration of pulverized coal measurement method, characterized in that measured using high-precision load cell
The size of lower force measuring machine institute stress different in flow rate, in the situation known to wind powder mixture speed, according to load cell
Power bar is in flow field by the resistance formula of wind powder mixture:
(1)
(2)
The density size of mixture in certain temperature and pressure Fluid field can be calculated, in certain temperature and pressure Fluid field
The density size of middle airUnder the premise of known, and then calculate concentration of pulverized coal in flow field。
2. a kind of measuring device of thermoelectricity station-service concentration of pulverized coal according to claim 1, characterized in that with two
And more than two high-precision load cells are connected with power bar, power bar is inserted into air duct, and wind powder mixture, which streams, causes resistance, power
It is passed to upside sensor side by power bar, measure lower two power different in flow rate or more force vectors and knows the suffered flowing of power bar
The size of resistance F, i.e.,。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910437253.8A CN110057735A (en) | 2019-05-24 | 2019-05-24 | A kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910437253.8A CN110057735A (en) | 2019-05-24 | 2019-05-24 | A kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110057735A true CN110057735A (en) | 2019-07-26 |
Family
ID=67324261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910437253.8A Withdrawn CN110057735A (en) | 2019-05-24 | 2019-05-24 | A kind of thermoelectricity station-service concentration of pulverized coal measurement method and measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110057735A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1912588A (en) * | 2006-08-23 | 2007-02-14 | 太原市海通自动化技术有限公司 | Coal on-line analyse equipment based on laser induced spectral and nerve network technology |
| CN103822669A (en) * | 2014-03-19 | 2014-05-28 | 山西大学 | Pulverized coal online monitoring method of boiler |
| CN109187295A (en) * | 2018-09-03 | 2019-01-11 | 南京科远自动化集团股份有限公司 | First air on-line system for measuring the densities and measurement method |
| CN109681907A (en) * | 2018-12-29 | 2019-04-26 | 浙江大学 | A kind of coal-fired plant boiler varying duty wind coal matching control apparatus and method |
-
2019
- 2019-05-24 CN CN201910437253.8A patent/CN110057735A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1912588A (en) * | 2006-08-23 | 2007-02-14 | 太原市海通自动化技术有限公司 | Coal on-line analyse equipment based on laser induced spectral and nerve network technology |
| CN103822669A (en) * | 2014-03-19 | 2014-05-28 | 山西大学 | Pulverized coal online monitoring method of boiler |
| CN109187295A (en) * | 2018-09-03 | 2019-01-11 | 南京科远自动化集团股份有限公司 | First air on-line system for measuring the densities and measurement method |
| CN109681907A (en) * | 2018-12-29 | 2019-04-26 | 浙江大学 | A kind of coal-fired plant boiler varying duty wind coal matching control apparatus and method |
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Application publication date: 20190726 |
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| WW01 | Invention patent application withdrawn after publication |