CN209946002U - Hydrogen chloride gas on-line monitoring equipment - Google Patents
Hydrogen chloride gas on-line monitoring equipment Download PDFInfo
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- CN209946002U CN209946002U CN201920425681.4U CN201920425681U CN209946002U CN 209946002 U CN209946002 U CN 209946002U CN 201920425681 U CN201920425681 U CN 201920425681U CN 209946002 U CN209946002 U CN 209946002U
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910000041 hydrogen chloride Inorganic materials 0.000 title claims abstract description 48
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
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Abstract
The utility model provides hydrogen chloride gas on-line monitoring equipment, which relates to the technical field of gas detection and comprises a tunable diode laser, a beam splitter, a sample cell communicated with gas to be detected, a reference cell communicated with hydrogen chloride gas with known concentration, two detectors in one-to-one correspondence with the sample cell and the reference cell, a data acquisition card connected with the output ends of the two detectors and a computer connected with the data acquisition card; the sample cell is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and a flow control valve is arranged on the air inlet pipeline; the tunable wavelength range of the tunable diode laser is 1.5-2.2 μm. The utility model provides a hydrogen chloride gas on-line monitoring equipment has realized the real-time accurate monitoring to hydrogen chloride gas's ground for a long time.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection technique and specifically relates to a hydrogen chloride gas on-line monitoring equipment is related to.
Background
HCl (hydrogen chloride) is a colorless and pungent gas. The aqueous solution of hydrogen chloride is hydrochloric acid, the pure hydrochloric acid is colorless liquid, and the smell of the hydrochloric acid is strong in volatility and pungent and sour. It is easily dissolved in aqueous solution and is acidic, called hydrochloric acid. The method is mainly used for preparing dye, spice, medicine, various chlorides and corrosion inhibitors, and is also used for gas-phase polishing of monocrystalline silicon wafers and corrosion of epitaxial bases in the production of large-scale integrated circuits. Industrially, hydrogen and chlorine are directly combined at 250 ℃ to prepare hydrogen chloride; it is also a by-product of the chlorination of hydrocarbons.
However, hydrogen chloride has a strong irritating effect on the eye and respiratory mucosa. Symptoms occurring during acute poisoning include headache, dizziness, nausea, ophthalmalgia, cough, blood-stained sputum, hoarseness, dyspnea, chest distress, chest pain, etc. Pneumonia, pulmonary edema and atelectasis may occur in severe cases. Ulceration or clouding of the cornea is visible. Direct contact with the skin can cause a large number of miliary red pimples with hot and painful flushes. After long-term contact with higher concentration, chronic bronchitis, gastrointestinal dysfunction and dental erosion can be caused. Meanwhile, leakage can cause harm to the environment, pollute water, and the aqueous solution has strong corrosivity and can cause death of aquatic animals and plants. During transportation, the dangerous goods are strictly assembled according to a dangerous goods assembly table in the dangerous goods transportation regulation of the Ministry of railways.
Therefore, the real-time monitoring of the hydrogen chloride gas is very important in daily environmental monitoring and industrial production, and the traditional hydrogen chloride detection method, namely the ion chromatography, has long detection period and high detection limit, and is not beneficial to real-time detection and control.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an online hydrogen chloride gas monitoring device to realize real-time and accurate monitoring of hydrogen chloride gas for a long time.
In order to achieve the above object, an embodiment of the present invention provides an online hydrogen chloride gas monitoring device, which includes a tunable diode laser, a beam splitter, a sample cell through which a gas to be detected flows, a reference cell through which a hydrogen chloride gas with a known concentration flows, two detectors corresponding to the sample cell and the reference cell one to one, a data acquisition card connected to output ends of the two detectors, and a computer connected to the data acquisition card; the sample cell is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and a flow control valve is arranged on the air inlet pipeline;
the tuning wavelength range of the tunable diode laser is 1.5-2.2 mu m;
the laser beam emitted by the tunable diode laser is changed into a first beam and a second beam through the beam splitter; the first beam enters the sample cell and the second beam enters the reference cell; the two detectors respectively detect a sample absorption signal of the gas in the sample cell and a reference absorption signal of the gas in the reference cell; and the data acquisition card performs analog-to-digital conversion on the sample absorption signal and the reference absorption signal and sends the converted data to the computer.
Optionally, a collimating lens is further disposed between the tunable diode laser and the beam splitter.
Optionally, the hydrogen chloride gas online monitoring device further comprises a mirror, and the mirror is used for reflecting the first light beam transmitted from the beam splitter to the sample cell.
Optionally, the tunable diode laser includes a semiconductor optical amplifier and a driving circuit, and the driving circuit is connected to the semiconductor optical amplifier.
Optionally, the chip model of the semiconductor optical amplifier is BOA 1007.
Optionally, the sample cell and the reference cell are both multiple reflection cells.
Optionally, the multiple reflection cell has a substantial length of 43.5 cm.
The embodiment of the utility model provides a following beneficial effect has been brought:
in the embodiment of the utility model, the hydrogen chloride gas on-line monitoring equipment comprises a tunable diode laser, a beam splitter, a sample cell communicated with the gas to be measured, a reference cell communicated with the hydrogen chloride gas with known concentration, two detectors in one-to-one correspondence with the sample cell and the reference cell, a data acquisition card connected with the output ends of the two detectors, and a computer connected with the data acquisition card; the sample cell is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and a flow control valve is arranged on the air inlet pipeline; the tuning wavelength range of the tunable diode laser is 1.5-2.2 μm; laser beams emitted by the tunable diode laser are changed into a first beam and a second beam through the beam splitter; the first light beam enters the sample cell, and the second light beam enters the reference cell; the two detectors respectively detect a sample absorption signal of gas in the sample cell and a reference absorption signal of gas in the reference cell; the data acquisition card performs analog-to-digital conversion on the sample absorption signal and the reference absorption signal and sends the converted data to the computer. The hydrogen chloride gas on-line monitoring equipment utilizes the wavelength tuning characteristic of a tunable diode laser to obtain the absorption spectrum of the selected characteristic absorption line of the gas to be detected, thereby carrying out qualitative or quantitative analysis on the hydrogen chloride gas; by selecting the tunable diode laser with the tuning wavelength range of 1.5-2.2 mu m, the laser has the characteristics of high sensitivity, low detection limit (ppb level), high cost performance and the like; in addition, the gas flow of the HCL gas in the reference cell is known, and the gas flow in the sample cell can be kept consistent with the gas flow in the sample cell through the flow control valve, so that the influence on the detection result caused by different gas flows is reduced. Therefore, the embodiment of the utility model provides a hydrogen chloride gas on-line monitoring equipment has realized the real-time accurate monitoring to hydrogen chloride gas for a long time.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an online hydrogen chloride gas monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another hydrogen chloride gas online monitoring device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
At present, the hydrogen chloride gas is detected by adopting an ion chromatography method, the detection period is long, the detection limit is high, and the real-time detection and control are not facilitated. Based on this, the embodiment of the utility model provides a hydrogen chloride gas on-line monitoring equipment can realize the quick on-line monitoring of HCL exhaust gas pollutant, provides technical support for aassessment pollution sources emission total amount, pollutant control and treatment.
In order to facilitate understanding of the present embodiment, the hydrogen chloride gas on-line monitoring device disclosed in the embodiments of the present invention will be described in detail below.
Fig. 1 is a schematic structural diagram of a hydrogen chloride gas online monitoring device provided in an embodiment of the present invention, as shown in fig. 1, the hydrogen chloride gas online monitoring device includes a tunable diode laser, a beam splitter, a sample cell through which a gas to be detected flows, a reference cell through which a hydrogen chloride gas with a known concentration flows, two detectors corresponding to the sample cell and the reference cell one to one, a data acquisition card connected to output ends of the two detectors, and a computer connected to the data acquisition card; the sample cell is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and a flow control valve is arranged on the air inlet pipeline; the tunable wavelength range of the tunable diode laser is 1.5-2.2 μm.
The working process is as follows: laser beams emitted by the tunable diode laser are changed into a first beam and a second beam through the beam splitter; the first light beam enters the sample cell, and the second light beam enters the reference cell; the two detectors respectively detect a sample absorption signal of gas in the sample cell and a reference absorption signal of gas in the reference cell; the data acquisition card performs analog-to-digital conversion on the sample absorption signal and the reference absorption signal and sends the converted data to the computer.
The working principle is as follows: the HCL gas content (concentration) is detected by a direct absorption spectrum technology that laser wavelength passes through a characteristic absorption region of the gas to be detected and an absorption spectrum line of the HCL gas in the vicinity of 1.55 mu m wavelength, and then the HCL concentration in the gas to be detected is obtained by comparing the HCL gas content (concentration) with a reference cell of HCL gas with known concentration.
Optionally, as shown in fig. 1, the hydrogen chloride gas online monitoring apparatus further includes a mirror, and the mirror is configured to reflect the first light beam transmitted from the beam splitter to the sample cell. Therefore, the sample cell and the reference cell can be arranged in parallel, and the structure is more compact.
Optionally, the sample cell and the reference cell are both multiple reflection cells. The two ends of the multiple reflection cell are respectively provided with a reflector with a hole, so that light beams can be repeatedly reflected between the two reflectors after entering an absorption area (an area where a detected gas or HCL gas with known concentration is located), the optical path of the absorption area is increased, and the detection precision can be improved.
Alternatively, the basic length of the multi-reflection cell can be 43.5cm, and the optical path of the multi-reflection cell can reach 46.98 m.
Optionally, when the multiple reflection cell is adopted, the specific working process of the hydrogen chloride gas online monitoring device is as follows: the first light beam transmitted from the beam splitter reaches a detector after being reflected for multiple times by the sample cell, and is used for measuring a sample absorption signal of gas in the sample cell; the second beam reflected from the beam splitter passes through a reference cell and then onto another identical detector for obtaining a reference absorption signal. The signal output from each detector is divided into two paths, one path is input into a phase-locked amplifier, the signal is detected by the phase-locked amplifier, and then the second harmonic signal output by the phase-locked amplifier is subjected to A/D conversion (analog-to-digital conversion) by a data acquisition card; and the other path of light is directly input into a data acquisition card, and the signal is subjected to A/D conversion through the data acquisition card to obtain a signal reflecting light intensity. And then processing the four paths of signals in a computer to obtain the concentration of the gas to be measured.
In the embodiment of the utility model, the hydrogen chloride gas on-line monitoring equipment utilizes the wavelength tuning characteristic of the tunable diode laser to obtain the absorption spectrum of the selected characteristic absorption line of the gas to be measured, thereby carrying out qualitative or quantitative analysis on the hydrogen chloride gas; by selecting the tunable diode laser with the tuning wavelength range of 1.5-2.2 mu m, the laser has the characteristics of high sensitivity, low detection limit (ppb level), high cost performance and the like; in addition, the gas flow of the HCL gas in the reference cell is known, and the gas flow in the sample cell can be kept consistent with the gas flow in the sample cell through the flow control valve, so that the influence on the detection result caused by different gas flows is reduced. Therefore, the embodiment of the utility model provides a hydrogen chloride gas on-line monitoring equipment has realized the real-time accurate monitoring to hydrogen chloride gas for a long time.
Fig. 2 is a schematic structural diagram of another hydrogen chloride gas online monitoring device according to an embodiment of the present invention, and as shown in fig. 2, a collimating lens is further disposed between the tunable diode laser and the beam splitter. The collimating lens may cause the laser beam emitted by the tunable diode laser to be emitted as parallel light.
Optionally, the collimating lens has a diameter of 9mm and a focal length of 12 mm.
Alternatively, as shown in fig. 2, the tunable diode laser includes a semiconductor optical amplifier and a driving circuit, and the driving circuit is connected to the semiconductor optical amplifier.
Optionally, the chip model of the semiconductor optical amplifier is BOA 1007.
BOA1007, the chip is a high saturation output power polarization maintaining high bandwidth optical amplifier. It integrates an efficient InP/InGaAsP quantum well (QW group) structure and ridge waveguide design. The chip has the following characteristics: high saturation output power, wide spectral bandwidth, high gain, high polarization extinction ratio. The technical parameters are shown in the following table 1.
TABLE 1
Optionally, the tunable diode laser has an output power of 5mW at a wavelength of about 1.55 μm.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The hydrogen chloride gas online monitoring equipment is characterized by comprising a tunable diode laser, a beam splitter, a sample cell filled with gas to be detected, a reference cell filled with hydrogen chloride gas with known concentration, two detectors in one-to-one correspondence with the sample cell and the reference cell, a data acquisition card connected with the output ends of the two detectors and a computer connected with the data acquisition card; the sample cell is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and a flow control valve is arranged on the air inlet pipeline;
the tuning wavelength range of the tunable diode laser is 1.5-2.2 mu m;
the laser beam emitted by the tunable diode laser is changed into a first beam and a second beam through the beam splitter; the first beam enters the sample cell and the second beam enters the reference cell; the two detectors respectively detect a sample absorption signal of the gas in the sample cell and a reference absorption signal of the gas in the reference cell; and the data acquisition card performs analog-to-digital conversion on the sample absorption signal and the reference absorption signal and sends the converted data to the computer.
2. The on-line hydrogen chloride gas monitoring device according to claim 1, wherein a collimating lens is further disposed between the tunable diode laser and the beam splitter.
3. The on-line hydrogen chloride gas monitoring device of claim 1, further comprising a mirror for reflecting the first light beam transmitted from the beam splitter to the sample cell.
4. The on-line hydrogen chloride gas monitoring device according to claim 1, wherein the tunable diode laser comprises a semiconductor optical amplifier and a driving circuit, and the driving circuit is connected with the semiconductor optical amplifier.
5. The on-line hydrogen chloride gas monitoring device according to claim 4, wherein the chip model of the semiconductor optical amplifier is BOA 1007.
6. The on-line hydrogen chloride gas monitoring device of claim 1, wherein the sample cell and the reference cell are both multi-reflection cells.
7. The on-line hydrogen chloride gas monitoring device of claim 6, wherein the multiple reflection cell has a substantial length of 43.5 cm.
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| CN201920425681.4U CN209946002U (en) | 2019-03-30 | 2019-03-30 | Hydrogen chloride gas on-line monitoring equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730403A (en) * | 2020-12-29 | 2021-04-30 | 中国南方电网有限责任公司超高压输电公司柳州局 | Portable measuring device for chlorine and chloride content in atmosphere and gas measuring method thereof |
| CN112748095A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High altitude electric power material corrosives parameter fixed point monitoring devices |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730403A (en) * | 2020-12-29 | 2021-04-30 | 中国南方电网有限责任公司超高压输电公司柳州局 | Portable measuring device for chlorine and chloride content in atmosphere and gas measuring method thereof |
| CN112748095A (en) * | 2020-12-29 | 2021-05-04 | 中国南方电网有限责任公司超高压输电公司柳州局 | High altitude electric power material corrosives parameter fixed point monitoring devices |
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