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A low-concentration flue gas infrared analyzer and detection method based on Fourier transform

An infrared analyzer and Fourier transform technology, which is applied in the analysis of materials, material analysis by optical means, instruments, etc., can solve the problems of many interference factors in pollutant measurement, unsuitable for continuous measurement, and complex measurement system. The effect of improving response time characteristics, minimizing optical drift, and improving instrument sensitivity

Active Publication Date: 2016-09-07
NANJING ASSEN ENVIRONMENT TECH
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  • Description
  • Claims
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Problems solved by technology

Typical representatives of these technologies are: Cerex of the United States adopts DOAS ultraviolet differential technology, Finland GASMET adopts FTIR Fourier transform infrared analysis technology, but DOAS ultraviolet differential technology is generally only suitable for monitoring trace gases (ppb level); FTIR Fu Lie leaf infrared analysis technology, the measurement system is complicated, and it needs supporting facilities such as interferometers. The equipment is expensive and generally not suitable for continuous measurement. At present, my country's pollution sources are distributed in various industrial enterprises such as electric power, steel, and cement, and the working conditions of pollution sources are complex and diverse. They are all faced with the problem of many interference factors in pollutant measurement. In the practical application of foreign flue gas monitoring instruments, there are phenomena of "acclimatization" and "standard inconsistency".

Method used

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  • A low-concentration flue gas infrared analyzer and detection method based on Fourier transform
  • A low-concentration flue gas infrared analyzer and detection method based on Fourier transform
  • A low-concentration flue gas infrared analyzer and detection method based on Fourier transform

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Embodiment 1

[0039] figure 1 It is a structural layout diagram of the flue gas analyzer in the embodiment of the present invention, as shown in the figure, including a chassis 1, a heating control unit 2, an output display unit 3, a data acquisition and processing unit 4, and a power supply 5; a flue gas pipe is arranged in the chassis 1 The water filter device 6 is installed at the inlet of the flue gas pipeline, and the temperature sensor, pressure sensor, humidity sensor, oxygen sensor 7, and gaseous pollutant detection unit 8 are respectively installed on the flue gas pipeline; a flue gas multi-parameter The measuring chamber 9, the temperature sensor, the pressure sensor and the humidity sensor are all set in the flue gas multi-parameter measuring chamber 9.

[0040] The gaseous pollutant detection unit 8 of this embodiment includes figure 2 The mid-infrared light source 10 and the shutter arranged thereafter are arranged along the optical path behind the light chopper to be an abs...

Embodiment 2

[0045] As an improvement of Embodiment 1, in this embodiment, the detection sensor 15 in Embodiment 1 is preferably a pyroelectric infrared detector, and the structure includes Figure 4 Middle pyroelectric element 24, electrode 25, external circuit wire 26, load 27, power supply 28 are composed, wherein, pyroelectric element 24 is arranged at the position facing the optical path direction at the rear of optical filter 14, and electrodes 25 are respectively located at pyroelectric On both sides of the element 24 , the external circuit wires 26 are connected in series with the load 27 and the power source 28 respectively to the electrodes 25 on both sides of the pyroelectric element 24 . In the above technical solution, the pyroelectric element 24 is preferably made of lithium tantalate crystal (TaLiO3) material, and other structures are the same as those in Embodiment 1.

[0046] figure 2 Among them, the monochromatic light emitted by the infrared light source 10 is modulate...

Embodiment 3

[0048] Adopt the detection method of the analyzer of embodiment 1, it is characterized in that comprising the steps:

[0049] Step 1. Standard gas preparation: configure NO or CO standard gas with a mass concentration of 100mg / m3, and the balance is nitrogen, to be tested;

[0050] Step 2, start-up and preheating: the infrared light source (10) emits monochromatic light, and the shutter shields the infrared light source (10) to generate two beams of light that illuminate the sample cell (20) and the reference cell (21) respectively; the first The light beam is the measurement side beam, which passes through the absorption cell (12), the sample cell (20), and the filter (14) to the detection sensor (15) in sequence; the second beam is the reference side beam, which passes through the absorption cell (12), the reference Compared with the cell (21), the filter (14) reaches the detection sensor (15);

[0051] Step 3, zero gas correction: pass zero gas into the analyzer, select ni...

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Abstract

The invention belongs to the field of flue gas monitoring equipment, in particular to an infrared on-line detection analyzer for flue gas such as low concentration NO based on a Fourier time-frequency transform model. The low-concentration flue gas infrared analyzer based on Fourier transform of this patent includes a chassis, a heating control unit, an output display unit, a data acquisition and processing unit, a power supply, a water filtration device, and a gaseous pollutant detection unit; The Fourier transform infrared analyzer does not need to be specially equipped with an expensive interferometer, and the structure is simpler, so the cost of the equipment is significantly reduced; the whole system adopts the double-beam photometer method, which significantly reduces the influence of temperature on the measured value, so The long-term working stability of the analyzer is higher. The instrument response time is faster, the detection time is shortened, and the instrument sensitivity is improved.

Description

technical field [0001] The invention belongs to the field of flue gas monitoring equipment, in particular to an infrared on-line detection analyzer for flue gas such as low concentration NO based on a Fourier time-frequency transform model. Background technique [0002] Existing Fourier transform infrared analyzers are usually designed according to the principle of light coherence, and are a kind of interference spectrometer. In the operation of measuring gas concentration using the principle of Fourier transform infrared spectroscopy, it is mainly completed in three steps: the first step is to measure the infrared interferogram, which is a time-domain spectrum; Perform fast Fourier transform calculation on the spectrogram to obtain the frequency domain spectrum as a function of wavelength or frequency, that is, the Fourier transform infrared spectrogram; the third step is to find the characteristic absorption peak of the gas to be measured and measure the peak height value...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504
CPCG01N21/3504G01N2021/3595
Inventor 刘德允陈莹范黎锋章曙孙明伟倪庆
Owner NANJING ASSEN ENVIRONMENT TECH
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