CN205209550U - On - line measuring device of boiler pulverized coal granule parameter - Google Patents

Abstract

The utility model relates to an on - line measuring device of boiler pulverized coal granule parameter. The device includes: light signal acquisition element for gathering the light signal of pulverized coal particle, including no. Two probes, having the measurement region that the pulverized coal particle flows past on the probe, probe direction of motion of edge pulverized coal particle in the boiler pulverized coal pipeline is the upstream and downstream and arranges, and the data processing unit, signal acquisition element is connected with light, including data acquisition system and analysis processes system for the signal that signal acquisition element gathered of setting a camera is handled. The utility model has the advantages of the structure principle is simple, sensitivity is high.

Description

The on-line measurement device of boiler coal-ash particle parameter

Technical field

The utility model belongs to thermal measurement field, is specifically related to the boiler of power plant coal dust Parameter Measuring device of a kind of double excitation sensor coupling.

Background technology

Improving thermal power generation boiler of power plant efficiency, reducing pollutant emission is that country implements one of key issue of energy-saving and emission-reduction and environmental protection.Wherein, the real-time online measuring of pulverized coal particle concentration, speed and granularity in the pulverized coal channel of boiler of power plant plays an important role for energy-saving and emission-reduction, optimal control.But, because it is very complicated as Dual-Phrase Distribution of Gas olid flow condition, bring a lot of difficulty to measurement.

At present, the On-line Measuring Method of conventional pulverized coal particle concentration, speed and granularity has ultrasonic method, image method etc.

But the physical parameter needed for ultrasonic method measurement is larger with working conditions change; Image method is measured then has specific requirement to gas-particle two-phase concentration etc.

Utility model content

The utility model overcomes certain or some defect of the prior art, provides the boiler of power plant coal dust Parameter Measuring device of a kind of double excitation sensor coupling, realizes the real-time online measuring of pulverized coal particle parameter in pulverized coal channel in boiler of power plant.

The utility model provides a kind of on-line measurement device of boiler coal-ash particle parameter, comprising:

Light signal collection unit, for gathering the light signal of pulverized coal particle, comprises two-way probe, probe has the measured zone that pulverized coal particle flows through, and the direction of motion of probe along pulverized coal particle in boiler pulverized coal pipeline presents arranged downstream; And

Data processing unit, is connected with light signal collection unit, comprises data acquisition system (DAS) and analysis process system, processes for the signal gathered light signal collection unit.

According to the utility model, effectively improve the ease of coal dust parameter devices in boiler of power plant pulverized coal channel, improve reliability and measurement sensistivity simultaneously.

According to an embodiment of the present utility model, probe is furnished with photovalve, photovalve is arranged near the end in the insertion boiler pulverized coal pipeline of probe, and receives the light signal of pulverized coal particle by photovalve and convert light signal to electric signal.In probe, be furnished with the light source of the measured zone for irradiating probe, light source is arranged near the end relative with arranging the end of photovalve of probe.Light source is laser instrument.By the measurement mechanism arranged like this, make measurement mechanism structure more simple and compact and the reliability of measurement can be improved further.

According to an embodiment of the present utility model, the measured zone of probe is groove, and groove is arranged on photovalve annex, and radially caves inward from the outside of probe body, measurement mechanism structure can be made so simple and handled easily

According to an embodiment of the present utility model, two-way probe is connected with data processing unit respectively by data line.Data acquisition system (DAS) record also preserves the signal that light signal collection unit gathers, data processing unit to data acquisition system (DAS) to record and the signal preserved processes, handled result is stored in data acquisition system (DAS), thus realizes online acquisition and the parameter calculating of pulverized coal particle.

According to an embodiment of the present utility model, utilize protective material to carry out seal protection to photovalve, the reliability of measurement mechanism can be provided further like this and extend serviceable life of measurement mechanism.

According to preferred embodiment of the present utility model, the data processing unit of measurement mechanism of the present utility model processes light fluctuating signal, and according to Bill's lambert's law:

$\mathrm{\Γ}=\ln \left(\frac{I_t}{I_0}\right)=-LN({\mathrm{\πD}}^2/4)k_{ext}(\mathrm{\λ},m,D)=-({\mathrm{\πD}}^2/4)(n/A)k_{ext}(\mathrm{\λ},m,D)$

Can obtain grain graininess and concentration, and grain graininess process obtained and concentration structure are stored in analysis process system, wherein, Γ is called logarithm transmissivity, is transmitted light intensity I _twith incident intensity I ₀logarithm ratio; L is the light path of measuring beam in measurement zone; N is unit volume particle number concentrations, and when beam area is A, this moment laser irradiates granule number n=NAL; D is the mean grain size of particle; k _extbe extinction coefficient, it is the function of lambda1-wavelength λ, mean particle size D and Particle Phase refractive index m, can be tried to achieve by Mie theory.Accordingly, the granule number in combination with measured zone meets Poisson distribution, finally can obtain grain graininess and concentration.

Data processing unit using two-way light fluctuating signal as the random signal x (t) of cross-correlation analysis and y (t), can also carry out the cross correlation function analysis of two signals:

$R_{xy}\left(t\right)=\underset{T\→\mathrm{\∞}}{\lim }\frac{1}{T}{\∫}_0^{T}x\left(t\right)y(t+\mathrm{\τ})dt$

Wherein T is the integral mean time, and τ is time variable, R _xy(τ) at τ=τ ₀reach maximal value, the transit time of cross-correlated signal is τ ₀.Thus particle average velocity v: v=d/ τ can be obtained ₀, wherein d is the distance between double excitation sensor, and is stored in processing the particle speed obtained in analysis process system.

The utility model provides the boiler of power plant coal dust Parameter Measuring device of a kind of double excitation sensor coupling, realize the real-time online measuring of pulverized coal particle concentration, speed, granularity in pulverized coal channel in boiler of power plant, in the existing boiler of power plant pulverized coal channel of effective raising, the ease of coal dust parameter devices, improves measurement sensistivity simultaneously.

Accompanying drawing explanation

Fig. 1 is the structural representation of the boiler of power plant coal dust Parameter Measuring device of double excitation sensor of the present utility model coupling; And

Fig. 2 is the process flow diagram of the boiler of power plant coal dust Parameter Measuring method of double excitation sensor of the present utility model coupling.

Embodiment

The structure of the boiler of power plant coal dust Parameter Measuring device of double excitation sensor of the present utility model coupling is described in detail below in conjunction with accompanying drawing.

It will be appreciated by those skilled in the art that embodiment described below is only to exemplary illustration of the present utility model, but not for making any restriction to it.

Fig. 1 is the structural representation of the boiler of power plant coal dust Parameter Measuring device of double excitation sensor of the present utility model coupling, and this measurement mechanism is for measuring the granularity of pulverized coal particle in boiler of power plant pulverized coal channel, concentration and speed.

As shown in Figure 1, the boiler of power plant coal dust Parameter Measuring device 100 of double excitation sensor coupling comprises light signal collection unit 1 and data processing unit 2, and light signal collection unit 1 is connected with data processing unit 2 by cable 15.

Light signal collection unit 1 inserts in boiler of power plant pulverized coal channel 10, for gathering light (pulsation) signal that the measured zone that flows through this light signal collection unit 1 due to pulverized coal particle causes.

The signal gathered of data processing unit 2 pairs of light signal collection unit 1 processes, and to obtain the particle parameters such as grain graininess, concentration and speed, and records and preserves light (by force) signal and the data processed result of light signal collection unit 1.

Light signal collection unit 1 comprises two-way probe 12, and two-way probe 12 inserts in boiler of power plant pulverized coal channel 10, and is arranged in boiler of power plant pulverized coal channel 10 in the mode of upstream and downstream on the direction of pulverized coal particle motion.Light signal collection unit 1 also comprises and is arranged in the laser instrument 11 as light source in probe 12 and cloth and is set up photovalve 14 on probe 12.Photovalve 14 is arranged on probe 12, and is arranged near the end in the insertion boiler pulverized coal pipeline 10 of probe 12.Laser instrument 11 is arranged in probe 12, and near the end relative with arranging the end of photovalve 14 being arranged on probe 12, laser instrument 11 Emission Lasers and for being irradiated to measured zone 13.Measured zone 13 is positioned on probe 12, and pulverized coal particle can flow through this measured zone 13, and measured zone 13 can for being positioned at the groove on probe 12, and groove radially caves inward from the outside of probe body.Photovalve 14 utilizes protective material to carry out seal protection, can receive light (pulsation) signal of the random variation of the pulverized coal particle flowed through in measured zone 13, and light signal can be converted into electric signal.The electric signal transformed can be transferred into data processing unit 2 by cable 15.

Data processing unit 2 comprises data acquisition system (DAS) 22 and analysis process system 21.Data acquisition system (DAS) 22 is for recording and preserving light (by force) signal that light signal collection unit 1 gathers.Two-way light (pulsation) signal transfers to data acquisition system (DAS) 22 by cable 15, after signal data is collected, transfer to by cable 23 analysis and treament that analysis process system 21 carries out net result, and the result of analysis process system is stored in data acquisition system (DAS) 22.

Fig. 2 is the process flow diagram of the boiler of power plant coal dust Parameter Measuring method of double excitation sensor coupling in the present embodiment.

The concise and to the point formation describing on-line measurement device of the present utility model below.There is provided the coal dust probe 12 with groove structure, one of them end close of probe 12 is provided with groove, and this groove is as measured zone 13.Photovalve 14 is arranged on probe 12, and near the reeded end of the tool being arranged on probe 12, and with protective material, seal protection is carried out to photovalve 14.In probe 12, arrange the laser instrument 11 as light source, laser instrument 11 is positioned near the end relative with the end arranging photovalve 14 of probe 12 simultaneously.Again two-way coal dust probe 12 is inserted in boiler of power plant pulverized coal channel 10 respectively, and present arranged downstream along in the direction of motion of pulverized coal particle, and by cable 15, two-way probe 12 is connected with data processing section 2.

As shown in Figure 2, the boiler of power plant coal dust Parameter Measuring method of double excitation sensor coupling mainly comprises the following steps:

S1: open laser instrument 11, makes laser be irradiated to measured zone 13;

S2: utilize photovalve 14 to convert light signal to electric signal;

S3: signal data is transferred to data acquisition system (DAS) 22 by cable 15;

S4: signal is recorded by analysis process system 21 and preserves;

S5: data processing unit 2 processes light fluctuating signal, according to Bill's lambert's law:

$r=\ln \left(\frac{I_t}{I_0}\right)=-LN({\mathrm{\πD}}^2/4)k_{ext}(\mathrm{\λ},m,D)=-({\mathrm{\πD}}^2/4)(n/A)k_{ext}(\mathrm{\λ},m,D)---\left(1\right)$

Can obtain grain graininess and concentration, and grain graininess process obtained and concentration structure are stored in analysis process system, in above formula (1), Γ is called logarithm transmissivity, is transmitted light intensity I _twith incident intensity I ₀logarithm ratio; L is the light path of measuring beam in measurement zone; N is unit volume particle number concentrations, and when beam area is A, this moment laser irradiates granule number n=NAL; D is the mean grain size of particle; k _extbe extinction coefficient, it is the function of lambda1-wavelength λ, mean particle size D and Particle Phase refractive index m, can be tried to achieve by Mie theory.Accordingly, the granule number in combination with measured zone meets Poisson distribution, finally can obtain grain graininess and concentration.

S6: data processing unit as the random signal x (t) of cross-correlation analysis and y (t), carries out the cross correlation function analysis of two signals using two-way light fluctuating signal:

$R_{xy}\left(t\right)=\underset{T\→\mathrm{\∞}}{\lim }\frac{1}{T}{\∫}_0^{T}x\left(t\right)x(t+\mathrm{\τ})dt$

Wherein T is the integral mean time, and τ is time variable, R _xy(τ) at τ=τ ₀reach maximal value, the transit time of cross-correlated signal is τ ₀, and try to achieve τ signal transit time ₀.And obtain particle average velocity v further:

v＝d/τ ₀(2)

In this formula (2), d is the distance between double excitation sensor, and is stored in processing the particle speed obtained in analysis process system.

The utility model provides the boiler of power plant coal dust Parameter Measuring apparatus and method of a kind of double excitation sensor coupling, because the present embodiment is based on Bill's lambert's law and light scattering theory, in conjunction with principle of correlation analysis, the random light fluctuating signal that grain flow causes through measured zone is carried out analyzing and processing, the boiler of power plant coal dust Parameter Measuring apparatus and method of the double excitation sensor coupling that the present embodiment is provided only need two probes to obtain data, by processing data, boiler of power plant coal dust parameter can be obtained measure in real time, overcome that to have structural principle simple, highly sensitive advantage.

The utility model is not limited to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present utility model determined in described claim; these changes are apparent, and the utility model that all utilize the utility model to conceive is created all at the row of protection.

Claims (7)

1. an on-line measurement device for boiler coal-ash particle parameter, is characterized in that, comprising:

Light signal collection unit, for gathering the light signal of pulverized coal particle, comprises two-way probe, probe has the measured zone that pulverized coal particle flows through, and the direction of motion of probe along pulverized coal particle in boiler pulverized coal pipeline presents arranged downstream; And

Data processing unit, is connected with light signal collection unit, comprises data acquisition system (DAS) and analysis process system, processes for the signal gathered light signal collection unit.

2. the on-line measurement device of boiler coal-ash particle parameter according to claim 1, it is characterized in that, probe is furnished with photovalve, photovalve is arranged near the end in the insertion boiler pulverized coal pipeline of probe, and receives the light signal of pulverized coal particle by photovalve and convert light signal to electric signal.

3. the on-line measurement device of boiler coal-ash particle parameter according to claim 2, is characterized in that, is furnished with the light source of the measured zone for irradiating probe in probe, and light source is arranged near the end relative with arranging the end of photovalve of probe.

4. the on-line measurement device of boiler coal-ash particle parameter according to claim 3, is characterized in that, light source is laser instrument.

5. the on-line measurement device of boiler coal-ash particle parameter according to claim 2, is characterized in that, the measured zone of probe is groove, and groove is arranged on photovalve annex, and radially caves inward from the outside of probe body.

6. the on-line measurement device of boiler coal-ash particle parameter according to claim 1, is characterized in that, two-way probe is connected with data processing unit respectively by data line.

7. the on-line measurement device of boiler coal-ash particle parameter according to claim 1, it is characterized in that, data acquisition system (DAS) record also preserves the signal that light signal collection unit gathers, data processing unit to data acquisition system (DAS) to record and the signal preserved processes, handled result is stored in data acquisition system (DAS).