CN205209926U - Boiler pulverized coal sample fineness on - line measuring device - Google Patents

Abstract

The utility model relates to a boiler pulverized coal sample fineness on - line measuring device. The device includes: mechanical transmission unit is including lieing in the inside circulator of boiler pipeline for provide mechanical power is and transmit the mechanical power who provides, sampling unit is by the mechanical transmission unit drive, and along with the rotatory sampling probe of circulator on being located the circulator for draw boiler pulverized coal's sample, photoelectric conversion unit is connected with sampling unit for be voltage signal with the light signal conversion of the buggy sample that extracts, and data acquisition and processing unit, be connected with photoelectric conversion unit for carry out collection and processing to the voltage signal by photoelectric conversion unit changed, and calculate the grain fineness of the buggy sample that extracts. The utility model provides a boiler pulverized coal fineness on - line measuring device has simple structure, on line measurement, the high advantage of sensitivity with the method.

Description

Boiler coal-ash sampling fineness on-line measurement device

Technical field

The utility model belongs to thermal measurement field, is specifically related to a kind of boiler of power plant fineness of pulverized coal on-line measurement device.

Background technology

Along with the fast development of power industry, clean, safety, the economy that power plant runs is had higher requirement.But due to the complicacy of power plant system structure and operating condition, it is large that the operation of boiler relates to face.Wherein, the fineness of pulverized coal particle is one of key parameter affecting boiler operatiopn, so need to carry out real-time Measurement accuracy to the fineness of coal dust, thus suitable adjustment and maintenance are carried out to boiler plant, improve the security of boiler and the economy of power plant's operation.

But existing equipment is only after passing through sampling in the market, and coal dust is delivered to relevant departments and detects, therefore, its process cycle is long, and operating cost is also high, can not accomplish Real-time Feedback.

Utility model content

The purpose of this utility model is to overcome certain or some defect of the prior art, provides a kind of and can realize extracting representative pulverized coal particle in power plant's direct-firing pulverized coal system primary air piping and carry out the coal dust sampling fineness on-line measurement device of fineness of pulverized coal measurement in time.

An aspect of the present utility model provides a kind of boiler coal-ash sampling fineness on-line measurement device, comprising:

Mechanical transmission unit, comprises the spinner being positioned at boiler tubing inside, for providing machine power and transmitting provided machine power;

Sampling unit, is driven by mechanical transmission unit, comprises and being positioned on spinner and the sampling probe rotated with spinner, for extracting the sample of boiler coal-ash;

Photoelectric conversion unit, is connected with sampling unit, for the light signal of extracted coal dust sample is converted to voltage signal; And

Data acquisition and processing (DAP) unit, is connected with photoelectric conversion unit, for carrying out acquisition and processing to the voltage signal changed by photoelectric conversion unit, and calculates the grain fineness of extracted coal dust sample.

According to the utility model, representative particle is got in coal dust sampling, to the analysis of fineness of pulverized coal accurately and reliably, and real-time online measuring.

According to an embodiment of the present utility model, mechanical transmission unit also comprises the motor being positioned at boiler tubing outside, provides machine power to rotate to drive spinner by motor.

According to an embodiment of the present utility model, photoelectric conversion unit comprises light source, detecting area and photoelectric commutator, light source is for irradiating extracted coal dust sample, by photoelectric commutator, the light signal of the coal dust sample being positioned at detecting area is converted to voltage signal, therefore easily and accurately can extracts the signal of pulverized coal particle.

According to an embodiment of the present utility model, sampling unit also comprises the separation vessel being positioned at boiler tubing outside, separation vessel is for separating of the pulverized coal particle gone out in extracted coal dust sample, and by isolated pulverized coal particle be provided to the detecting area of photoelectric conversion unit, pulverized coal particle and the gas separaion in the coal dust sampled come by this separation vessel, thus measure the fineness of pulverized coal particle.

According to an embodiment of the present utility model, sampling unit also comprises by motor-driven air pump, for the sampling enabling sampling probe carry out coal dust.This air pump makes to produce negative pressure in sampling probe, thus is conducive to sampling coal dust.

According to an embodiment of the present utility model, sampling unit also comprises the separation vessel being positioned at boiler tubing outside, separation vessel for separating of the pulverized coal particle gone out in extracted coal dust sample, and by isolated pulverized coal particle be provided to the detecting area of photoelectric conversion unit.

According to an embodiment of the present utility model, light source is laser instrument.

According to an embodiment of the present utility model, sampling probe is furnished with thief hole, and thief hole communicates with separation vessel, to extract coal dust sample.The coal dust being mixed with air arrives separation vessel from the thief hole of sampling probe, carries out gas solid separation, thus obtain pulverized coal particle by separation vessel, to carry out the on-line measurement of coal dust fruit grain particle diameter.

For this practical boiler coal-ash sampling fineness on-line measurement device, owing to make use of based on light scattering principle, the laser be radiated on particle is produced scattering fluctuating signal realizes fineness of pulverized coal measurement as measuring-signal source, boiler of power plant fineness of pulverized coal on-line measurement apparatus and method provided by the invention are overcome shortcomings such as sample measuring period is long, have that structure is simple, on-line measurement, highly sensitive advantage.

Accompanying drawing explanation

Fig. 1 is the structural representation of boiler of power plant fineness of pulverized coal on-line measurement device of the present utility model;

Fig. 2 is the process flow diagram of boiler of power plant fineness of pulverized coal On-line Measuring Method of the present utility model.

Embodiment

First, outline describes the ultimate principle of boiler of power plant fineness of pulverized coal of the present utility model on-line measurement.

The utility model, by sampling gun is stretched into pulverized coal channel, utilizes blowback jet current principle, carries out suction flow control to sampling gun.Sampling gun connects a sampling probe, by Electric Machine Control, the plane internal rotation that sampling probe flows at vertical coal dust is turned, thus accomplishes uniform sampling.In the vertical measurement zone that the coal dust be drawn into is entered with cyclonic separation function, first the gas separaion in coal dust is gone out, then by light pulse methods, diameter measurement is carried out to the particle entered in vertical measurement zone.

Based on above-mentioned utility model principle, the utility model is in extraction primary air piping after representational coal dust, be separated through cyclone separator the coal dust obtained and enter measurement zone, in measurement zone, optical measuring element is set, when being irradiated to the coal dust in measurement zone when laser, because the granule number in measurement zone is time dependent, just can produce causes transmitted light intensity to occur fluctuating signal, convert the transmitted light received to voltage signal, after analog to digital conversion, send into computing machine carry out analyzing and processing and obtain fineness of pulverized coal parameter, realize utilizing light Fluctuation Method to the on-line measurement of fineness of pulverized coal in measurement zone.

Therefore, the utility model can be implemented as follows:

1, when Dual-Phrase Distribution of Gas olid flowing velocity in pipeline is higher and when fully distributing, in pipeline the distribution of particles of coal dust can think on pipeline section with Central Symmetry distribution, thus obtain along straight tube diametric(al) the fineness characteristic that a certain amount of coal dust can obtain coal dust;

2, probe connects one end of sampling gun, is sampled in a rotative pattern during sampling by Electric Machine Control to certain uniform cross of First air pipeline;

3, sampling gun center section is motor and the adjustable air pump by driven by motor, makes to produce a negative pressure in probe, by the coal dust inspiration in primary air piping;

4, the other end of sampling gun is equipped with the vertical tube having cyclone separator effect vertical with it, and the top of vertical tube is connected to weary gas and gets rid of flexible pipe, and weary gas is flow back to primary air piping;

5, coal dust is separated in vertical tube comes, and enters measurement zone;

6, laser instrument and optical detection device are arranged in measurement zone;

7, the fineness of pulverized coal particle is calculated according to following methods:

Assuming that transmitted light damping capacity meets Beer-Lambert law after particle:

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

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.

Definition S _extdelustring area for particle:

S _ext＝k _ext(πD ²/4)(2)

Substitution formula (1):

$\mathrm{\Γ}=\ln \left(\frac{I_t}{I_0}\right)=-(n/A)S_{ext}---\left(3\right)$

If reduce the sectional area A of light beam, a certain moment, illuminated granule number n also can correspondingly reduce, and present randomness when n reduces to a certain degree, fluctuating signal appears in corresponding transmitted light intensity.Can think that n meets Poisson distribution, E (n)=D (n) can be obtained, therefore can set up the statistics relation between logarithm transmissivity Γ and granule number n:

$E\left(n\right)=\frac{{\left(E\right(\mathrm{\Γ}\left)\right)}^2}{D\left(\mathrm{\Γ}\right)}---\left(4\right)$

Formula (3) is substituted into formula (4) particle delustring area value S can be tried to achieve _ext, just can the mean grain size D of count particles be thus:

$D=\sqrt{4S_{ext}/\left({\mathrm{\πk}}_{ext}\right)}---\left(5\right)$

Therefore, by measuring incident intensity and transmitted light intensity signal, according to the grain diameter parameter of foundation and the relation of light fluctuating signal, the on-line measurement to gas-solid rolling particles particle diameter just can be realized.

The structure of boiler of power plant fineness of pulverized coal on-line measurement device of the present utility model is described in further 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 boiler of power plant fineness of pulverized coal on-line measurement device of the present utility model.

As shown in Figure 1, boiler of power plant fineness of pulverized coal on-line measurement device comprises mechanical transmission unit, sampling unit, photoelectric conversion unit, data acquisition system (DAS) and data processing unit.

Mechanical transmission unit comprises the rotating mechanism 3 inserted in pulverized coal channel 1, is positioned at the motor 5 of pulverized coal channel 1 outside and the drive link 4 of connection traversing mechanism 3 and motor 5.

Sampling unit between mechanical transmission unit and photoelectric conversion unit, comprise be positioned on rotating mechanism 3 and the sampling probe 2 rotated together with rotating mechanism 3, whirlwind separator 6 and connect separation vessel 6 and sampling probe 2 transport pipeline.Sampling probe 2 is evenly covered with and has thief hole, thief hole communicates with cyclone separator 6, to isolate the pulverized coal particle in boiler tubing.

Photoelectric conversion unit is between cyclone separator 6 and data acquisition system (DAS) and data processing unit 10, and photoelectric conversion unit comprises the laser instrument 7 of the transmitting terminal being positioned at measurement zone, detecting area 8 and is positioned at the photoelectric commutator 9 of receiving end of measurement zone.Laser instrument 7 produces laser, to irradiate the pulverized coal particle in detecting area 8.Photoelectric commutator 9 is for being converted to voltage signal by light (pulsation) signal of be irradiated to pulverized coal particle.

One end of data acquisition system (DAS) and data processing unit 10 is connected with the photoelectric commutator 9 in photoelectric conversion unit.Data acquisition system (DAS) and data processing unit 10 for recording, preserving and process the voltage signal of the pulverized coal particle of photoelectric commutator output, and calculate the fineness of pulverized coal particle.

As the process flow diagram of the boiler of power plant fineness of pulverized coal measuring method in the present embodiment is shown Fig. 2 shown in, boiler of power plant fineness of pulverized coal measuring method mainly comprises the following steps:

S1: according to the speed of the velocity range determination rotating mechanism 3 of coal dust Dual-Phrase Distribution of Gas olid flow field (pulverized coal channel 1) to be measured;

S2: utilize the sampler 2 in sampling unit to carry out the sampling of pulverized coal particle, and the coal dust of sampling is sent into cyclone separator 6 carry out being separated of coal dust and gas;

S3: isolated pulverized coal particle enters detecting area 8, now laser instrument 7 and photoelectric commutator 9 are started working, and by photoelectric commutator 9, the light signal of pulverized coal particle are converted to voltage signal;

S4: the voltage signal of data acquisition system (DAS) and data processing unit 10 real time record photoelectric commutator 9, and the fineness of pulverized coal particle is tried to achieve through data processing unit process.

Because the utility model utilizes based on light scattering principle, the laser be radiated on particle is produced scattering fluctuating signal realizes fineness of pulverized coal measurement as measuring-signal source, the boiler of power plant fineness of pulverized coal on-line measurement apparatus and method that the utility model is provided overcome the shortcomings such as sample measuring period is long, have that structure is simple, on-line measurement, 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. a boiler coal-ash sampling fineness on-line measurement device, is characterized in that, comprising:

Mechanical transmission unit, comprises the spinner being positioned at boiler tubing inside, for providing machine power and transmitting provided machine power;

Sampling unit, is driven by mechanical transmission unit, comprises and being positioned on spinner and the sampling probe rotated with spinner, for extracting the sample of boiler coal-ash;

Photoelectric conversion unit, is connected with sampling unit, for the light signal of extracted coal dust sample is converted to voltage signal; And

Data acquisition and processing (DAP) unit, is connected with photoelectric conversion unit, for carrying out acquisition and processing to the voltage signal changed by photoelectric conversion unit, and calculates the grain fineness of extracted coal dust sample.

2. boiler coal-ash sampling fineness on-line measurement device according to claim 1, it is characterized in that, mechanical transmission unit also comprises the motor being positioned at boiler tubing outside, provides machine power to rotate to drive spinner by motor.

3. boiler coal-ash sampling fineness on-line measurement device according to claim 1, it is characterized in that, photoelectric conversion unit comprises light source, detecting area and photoelectric commutator, the light signal of the coal dust sample being positioned at detecting area, for irradiating extracted coal dust sample, is converted to voltage signal by photoelectric commutator by light source.

4. boiler coal-ash sampling fineness on-line measurement device according to claim 1, it is characterized in that, sampling unit also comprises the separation vessel being positioned at boiler tubing outside, separation vessel for separating of the pulverized coal particle gone out in extracted coal dust sample, and by isolated pulverized coal particle be provided to the detecting area of photoelectric conversion unit.

5. boiler coal-ash sampling fineness on-line measurement device according to claim 4, it is characterized in that, sampling unit also comprises by motor-driven air pump, for the sampling enabling sampling probe carry out coal dust.

6. boiler coal-ash sampling fineness on-line measurement device according to claim 3, it is characterized in that, light source is laser instrument.

7. boiler coal-ash sampling fineness on-line measurement device according to claim 4, it is characterized in that, sampling probe is furnished with thief hole, and thief hole communicates with separation vessel, to extract coal dust sample.