Coal pulverizer gas analyzer based near infrared spectrumTechnical field
It the utility model is related to a kind of gas analyzer, especially a kind of coal pulverizer gas analysis based near infrared spectrumInstrument, belong to automatic control equipment technical field.
Background technology
Nucleus equipment of the coal pulverizer as boiler combustion pulverized coal preparation system, is the important paving machine of electric power thermal control, its working conditionThere is material impact to the safety and economy of the operation of whole power plant system.Traditional coal pulverizer gas analyzer uses sensorTechnology, dependence is big, the whether normal quality depending on sensor of analyzer, and single sensor can only be in coal pulverizerA kind of gas analyzed, can not comprehensively assess the quality of coal pulverizer, need to such as monitor two kinds of gases and more than, then need in additionSensor corresponding to increase, it is time saving and energy saving to accomplish.
Utility model content
The purpose of this utility model is：In view of the above-mentioned problems of the prior art, propose that one kind is based near infrared lightThe coal pulverizer gas analyzer of spectrum, using near-infrared spectrum technique, contained gas in more comprehensive on-line analysis coal pulverizerSpecies and concentration.
In order to reach object above, the utility model provides a kind of coal pulverizer gas analyzer based near infrared spectrum,Including gas collection unit, gas analysis processing unit and display output unit, the gas collection unit include sampling pump,Deduster and transfer conduit, the air inlet of the sampling pump connect coal pulverizer air outlet by pipeline, and the sampling pump goes outGas port connects the deduster by pipeline, and the gaseous sample after removing dust device dedusting delivers to gas analysis processing list through pipelineMember；
The gas analysis processing unit includes near-infrared light source, lens subassembly, optical fiber, gas flow cell and near-infraredLight-receiving component, the near infrared light that the near-infrared light source is sent deliver to gas circulation after the processing of front end lens subassembly by optical fiberPond, fiber optic multiplexer is provided with the both ends of the gas flow cell, passes through optical fiber between the fiber optic multiplexer at both ends2-3 gas sample contrast pond of connection and a blank reference cell, the gas sample, which contrasts, has gas sample room in pond, each gas sample contrasts pondGas sample room connected by pipeline and be connected with the pipeline of the gas sample acquisition unit；By the near infrared light of gas flow cell through lightAfter fibre is sent into the processing of back lens component, grating is refracted to by level crossing, passes through flat field orthogonal optical by the near infrared light of gratingGathered after group processing by CCD-detector, CCD-detector collects the near infrared light by each gas sample contrast pond, through computerData after processing are shown by display output unit.
Preferred scheme of the present utility model is：The foregoing coal pulverizer gas analyzer based near infrared spectrum, the gasBe arranged in parallel in sample contrast pond has standard reference by gas sample room and calibrating gas reference cell, the calibrating gas reference cell interior sealingGas, the reference gas of generally use are oxygen and carbon monoxide.
Described in the foregoing coal pulverizer gas analyzer based near infrared spectrum resistance to height is equipped with sampling pump turnover pipelineWarm protective layer.
Further, the foregoing coal pulverizer gas analyzer based near infrared spectrum, described sample set at pump steam inletThere is filter screen.
The beneficial effects of the utility model：The utility model, which uses, has nonabradable gas flow cell mechanism, stableProperty it is high, be particularly suitable for carrying out long-term uninterrupted failure-free operation under harsh conditions at the scene；Installed without sensor, only need to gatherGas is analyzed, first, time saving and energy saving save space can be accomplished, second, stable operation can be accomplished, it is sensorless moreChange；Due to using near-infrared spectrum technique, static measurement, the metering system of machinery-free type, high-precision measurement can be reached；ThisThe CCD-detector of application has the characteristics of quick scanning (50 spectrum/s), and repeatedly measurement is averagely remarkably improved lightCompose signal to noise ratio；In addition the light of near infrared band by optical fiber carry out long range transmission, can easily to sample carry out offline andOn-line measurement, improve detection working environment.
Brief description of the drawings
The utility model is further described below in conjunction with the accompanying drawings.
Fig. 1 is the schematic flow sheet of the utility model embodiment.
Embodiment
Embodiment one
The present embodiment provides a kind of coal pulverizer gas analyzer based near infrared spectrum, and structure is as shown in figure 1, including gasBody collecting unit, gas analysis processing unit and display output unit, gas collection unit include sampling pump 1, deduster 2 withAnd transfer conduit 3, the air inlet of sampling pump connect coal pulverizer air outlet by pipeline, the gas outlet of sampling pump is connected by pipelineDeduster, gaseous sample after removing dust device dedusting deliver to gas analysis processing unit through pipeline, in sampling pump turnover pipelineProvided with high temperature resistance protective layer, sample and be provided with filter screen at pump steam inlet；
Gas analysis processing unit includes near-infrared light source 4, lens subassembly 5, optical fiber 6, gas flow cell 7 and near-infraredLight-receiving component, gas sample contrast be arranged in parallel by gas sample room and calibrating gas reference cell, calibrating gas reference cell interior sealing in pondThere is standard reference gas, the reference gas of generally use are oxygen and carbon monoxide；The near infrared light warp that near-infrared light source is sentGas flow cell is delivered to by optical fiber after the processing of front lens component, fiber optic multiplexer 7- is provided with the both ends of gas flow cell1, pass through optical fiber between the fiber optic multiplexer at both ends and connect 3 gas samples and contrast a pond 7-2 and blank reference cell 7-3, gasThere is gas sample room, the gas sample room in each gas sample contrast pond passes through pipeline series connection and the pipeline phase of gas sample acquisition unit in sample contrast pondEven；Near infrared light receiving unit is sent into through optical fiber by the near infrared light of gas flow cell, after near infrared light receiving unitHold lens subassembly processing after, refract to grating 9 through level crossing 8, by the near infrared light of grating by flat field orthogonal optical group 10 atGathered after reason by CCD-detector 11, CCD-detector collects the near infrared light by each gas sample contrast pond, at computerData after reason are shown by display output unit 12.
The complex light that the near-infrared light source of the present embodiment is sent, after front lens component is converged and collimated,Imported again by optical fiber plus lens in incoming fibers, fiber optic multiplexer is entered by optical fiber, it is more by operating the optical fiberRoad converter, imports light into wherein that optical fiber enters in selected gas flow cell all the way, after light is passed through in gas flow cellThe absorption of light is produced, the light come out from flow cell carries the composition and property information of tested gas, is returned to the other endFiber optic multiplexer, and outlet optical fiber is imported into, the narrow of monochromator is then entered by another group of optical fiber plus lens groupSeam, after collimating and reflection is handled, monochromatic light is turned into by grating beam splitting, and after the processing of flat field orthogonal optical group, mostZhongdao is reached on line array CCD detector, and CCD difference picture dots correspond to corresponding wavelength, is crossed CCD drive circuits and is completed simultaneously respectivelyThe opto-electronic conversion of wavelength, and transmitted by way of electric charge lotus root conjunction, after amplified and A/D conversions, electronic signal is changed intoDigitized spectral signal, so as to accurately draw gas composition content.
In addition to the implementation, the utility model can also have other embodiment.It is all to use equivalent substitution or equivalent changeThe technical scheme to be formed is changed, all falls within the protection domain of the requires of the utility model.