阅读说明：本技术 气体监测用多波段探测的收发同侧光路结构、装置及应用 (Receiving and transmitting same-side light path structure, device and application of multiband detection for gas monitoring ) 是由 吴边 张乐文 张志荣 孙鹏帅 庞涛 夏滑 于 2020-06-22 设计创作，主要内容包括：本发明涉及工业加热炉炉内气体氛围的在线监测技术领域,具体地说,涉及一种气体监测用多波段探测的收发同侧光路结构、装置及应用。该光路结构包括激光收发单元和全角反射单元,激光收发单元用于产生发射光以及用于接收经全角反射单元反射后的反射光。该装置包括用于设置激光收发单元的激光发射接收筒和用于设置全角反射单元的反射镜固定筒。该应用将激光发射接收筒和反射镜固定筒相配合地设于加热炉侧壁处,以对加热炉内的气体氛围进行在线原位检测。本发明通过利用全角反射镜使发射光原路返回的特点,能够增加了一倍的检测光程,故能够较佳地提高监测精度；通过运用分光镜的半透半反原理,能够较佳地实现多组分气体的同时在线监测。(The invention relates to the technical field of on-line monitoring of gas atmosphere in an industrial heating furnace, in particular to a receiving and transmitting same-side light path structure for multi-band detection for gas monitoring, a device and application. The light path structure comprises a laser transceiving unit and a full-angle reflecting unit, wherein the laser transceiving unit is used for generating emitted light and receiving reflected light reflected by the full-angle reflecting unit. The device comprises a laser transmitting and receiving cylinder for arranging a laser transmitting and receiving unit and a reflector fixing cylinder for arranging a full-angle reflecting unit. The application is characterized in that the laser transmitting and receiving cylinder and the reflector fixing cylinder are arranged on the side wall of the heating furnace in a matching manner so as to carry out online in-situ detection on the gas atmosphere in the heating furnace. The invention can increase the detection optical path by one time by utilizing the characteristic that the total-angle reflector returns the original path of the emitted light, thereby better improving the monitoring precision; by applying the semi-transparent and semi-reflective principle of the spectroscope, the simultaneous online monitoring of the multi-component gas can be better realized.)

1. Receiving and transmitting homonymy light path structure that gaseous monitoring was surveyed with multiband, its characterized in that:

the device comprises a laser transceiving unit and a full-angle reflecting unit, wherein the laser transceiving unit is used for generating emitting light and receiving the reflecting light reflected by the full-angle reflecting unit;

the laser transceiving unit comprises a probe focusing lens (1), and the probe focusing lens (1) adopts a plano-convex focusing lens; a through hole is formed in the middle of the probe focusing lens (1), and a laser output head (5), an optical fiber collimator (6) and a beam expanding lens (7) are sequentially arranged in the through hole from the plane side to the convex side; the laser output head (5), the optical fiber collimator (6) and the beam expander (7) jointly form a transmitting light path, and the laser output head (5) is used for outputting emitted light with 2 wave bands;

the laser transceiving unit also comprises a spectroscope (2), a first photoelectric probe (3) and a second photoelectric probe (4) which are arranged at the plane side of the probe focusing lens (1);

the all-angle reflection unit comprises an all-angle reflection mirror (11), and a reflection light path is formed by the all-angle reflection mirror (11), the spectroscope (2), the first photoelectric probe (3) and the second photoelectric probe (4);

the omnidirectional reflector (11) is used for reflecting the emitted light at the emission light path to the convex side of the probe focusing lens (1), and the focusing lens (1) is used for focusing the reflected light of the omnidirectional reflector (11) to the spectroscope (2); the spectroscope (2) is used for separating the reflected light of the emitted light of the 2 wave bands, wherein one path of the separated light is transmitted to the first photoelectric probe (3) through the spectroscope (2), and the other path of the separated light is reflected to the second photoelectric probe (4).

2. The transmit-receive ipsilateral optical path structure for multi-band detection for gas monitoring of claim 1, wherein: the emitted light of the 2 wave bands comprisesFirst emission light for detecting CO gas and for detecting O₂The spectroscope (2) is used for transmitting the wave band of the first emitted light and reflecting the wave band of the second emitted light through the coating.

3. The same-side light path transmitting and receiving device based on the same-side light path transmitting and receiving structure of any one of claims 1 or 2, characterized in that: the laser receiving and transmitting unit is arranged in a laser transmitting and receiving cylinder (8), and the full-angle reflecting unit is arranged in a reflector fixing cylinder (12).

4. The apparatus for transmitting and receiving light from the same side as in claim 3, wherein: one end of the laser emission receiving cylinder (8) is provided with a first opening communicated with the inner cavity, the end face of the first opening forms a first mounting counter bore of which the inner wall is provided with threads, the convex surface side of the probe focusing lens (1) faces outwards and is arranged at the first mounting counter bore through a probe focusing lens locking ring (19), and the probe focusing lens locking ring (19) is in threaded fit with the inner wall of the first mounting counter bore.

5. The apparatus according to claim 4, wherein: the other end of the laser transmitting and receiving cylinder (8) is provided with a second opening communicated with the inner cavity, and a light splitting lens barrel (13) is inserted into the second opening; the spectroscope (2) is obliquely arranged at the inner end of the beam splitting lens cone (13), and the first photoelectric probe (3) is arranged at the outer end of the beam splitting lens cone (13).

6. The apparatus for transmitting and receiving light from the same side as in claim 5, wherein: a second mounting counter bore is arranged at the outer end of the light splitting lens barrel (13), and a receiving and adjusting hole sleeve (14) is arranged in the second mounting counter bore through a receiving and adjusting locking sleeve (15); a receiving small hole sleeve (16) is arranged at the position of the receiving adjusting hole sleeve (14), and the first photoelectric probe (3) is arranged at the position of the receiving small hole sleeve (16) through a first probe fixing frame (17).

7. The apparatus for transmitting and receiving light from the same side as in claim 5, wherein: the side wall of the laser emission receiving cylinder (8) is provided with a mounting through hole, the mounting through hole is provided with another receiving small hole sleeve (16), and the second photoelectric probe (4) is arranged at the other receiving small hole sleeve (16) through a second probe fixing frame (18).

8. The apparatus for transmitting and receiving light from the same side as in claim 3, wherein: the outer end of the laser transmitting and receiving cylinder (8) is provided with an optical fiber flange interface and a detector signal output interface, the optical fiber flange interface is connected with an optical fiber coupler of the probe focusing lens (1), and the detector signal output interface is connected with the first photoelectric probe (3) and the second photoelectric probe (4).

9. The apparatus for transmitting and receiving light from the same side as in claim 3, wherein: the laser emission receiving cylinder (8) and the inner end of the reflector fixing cylinder (12) are respectively provided with a protection unit, each protection unit comprises a high-temperature-resistant quartz window (9), and the high-temperature-resistant quartz window (9) is arranged at a window sealing cylinder (10) through a quartz window fixing ring (20); the window sealing cylinder (10) is connected with the laser emission receiving cylinder (8) or the reflector fixing cylinder (12) through an adjusting mechanism.

10. The use of the same-side optical transceiver device as that described in any one of claims 3 to 9 in a heating furnace is characterized in that: the laser transmitting and receiving cylinder (8) and the reflector fixing cylinder (12) are arranged on the side wall of the heating furnace in a matching way so as to carry out online in-situ detection on the gas atmosphere in the heating furnace.

Technical Field

The invention relates to the technical field of on-line monitoring of gas atmosphere in an industrial heating furnace, in particular to a receiving and transmitting same-side light path structure for multi-band detection for gas monitoring, a device and application.

Background

The smelting process of steel is essentially the circulation process of raw materials, fuels and finished products. The gas generated in the processes is one of essential key technologies for optimizing control, safety and environmental protection monitoring of the production process of the metallurgical industry by on-line detection and analysis, and the gas plays an important role in reducing energy consumption, ensuring production safety and the like.

The heating furnace is a key technical device in the production process of the steel billet, and has great influence on the quality and yield of products, energy conservation, consumption reduction, emission reduction, production cost control and other aspects. Therefore, in the steel industry, the optimal control of the heating furnace is very important for guaranteeing the product quality, saving energy and reducing emission. However, in the conventional combustion control, the gas concentration (such as O) in the furnace cannot be obtained on line in real time₂、CO、CO₂And H₂O, etc.), so that combustion proportioning control can only be carried out by means of human experience, which causes great errors, slightly causes insufficient combustion to cause energy consumption improvement, and seriously affects the quality of the produced billet product.

At present, most of various gas monitoring instruments installed on an industrial heating furnace in situ are extraction type or opposite emission type devices with separated receiving and transmitting, and the two types of monitoring instruments have the defects. Wherein, extraction formula gas monitoring instrument can only monitor the sample gas of extraction point, can't survey the gas of heating furnace inner space. The receiving and transmitting separated correlation device is limited by single optical path absorption on an absorption optical path, and the gas detection precision in the furnace is further influenced. Moreover, the two devices can only detect one gas, and cannot meet the requirement of on-line detection of multi-component gas in the heating furnace.

Disclosure of Invention

The invention provides a receiving and transmitting same-side optical path structure for multi-band detection for gas monitoring, which can overcome certain defects in the prior art.

The light path structure on the same side of receiving and transmitting of multiband detection for gas monitoring comprises a laser receiving and transmitting unit and a total angle reflection unit, wherein the laser receiving and transmitting unit is used for generating emitted light and receiving reflected light reflected by the total angle reflection unit;

the laser receiving and transmitting unit comprises a probe focusing lens, and the probe focusing lens adopts a plano-convex focusing lens; the middle part of the probe focusing lens is provided with a through hole, and a laser output head, an optical fiber collimator and a beam expanding lens are sequentially arranged in the through hole from the plane side to the convex side; the laser output head, the optical fiber collimator and the beam expanding lens jointly form a transmitting light path, and the laser output head is used for outputting emitted light of 2 wave bands;

the laser receiving and transmitting unit also comprises a spectroscope, a first photoelectric probe and a second photoelectric probe which are arranged at the plane side of the probe focusing lens;

the full-angle reflection unit comprises a full-angle reflection mirror, and a reflection light path is formed by the full-angle reflection mirror, the spectroscope, the first photoelectric probe and the second photoelectric probe;

the full-angle reflector is used for reflecting the emitted light at the emission light path to the convex side of the probe focusing lens, and the focusing lens is used for focusing the reflected light of the full-angle reflector to the spectroscope; the spectroscope is used for separating the reflected light of the emitted light of the 2 wave bands, wherein one path of the separated light is transmitted to the first photoelectric probe through the spectroscope, and the other path of the separated light is reflected to the second photoelectric probe.

The transmitting-receiving same-side optical path structure enables the sensor host to output laser in different wave bands through the plurality of optical fiber lasers, the output laser can be transmitted to the laser output head, emitted light is emitted in parallel after being collimated by the optical fiber collimator and expanded by the beam expander, the emitted light can pass through the gas detection area and is reflected by the full-angle reflector to form reflected light, the reflected light is expanded and returns along the original path and is focused by the focusing lens and then is output to the spectroscope, the reflected light can be separated by the spectroscope, the light in different wave bands is output to the first photoelectric probe and the second photoelectric probe respectively and then is converted into electric signals, and the sensor host can better acquire detection signals through acquisition of signals at the first photoelectric probe and the second photoelectric probe.

Preferably, the 2 wavelength bands of emitted light include a first emitted light for detecting CO gas and a second emitted light for detecting O gas₂The spectroscope is used for transmitting the wave band of the first emitted light and reflecting the wave band of the second emitted light through the coating. Thereby enabling the simultaneous on-line monitoring of multi-component gases to be preferably achieved.

The invention also provides a receiving and sending homonymy light path device based on any one of the receiving and sending homonymy light path structures, wherein the laser receiving and sending unit is arranged in a laser transmitting and receiving cylinder, and the full-angle reflecting unit is arranged in a reflector fixing cylinder. Therefore, the laser receiving and transmitting unit and the all-angle reflecting unit can be better packaged.

Preferably, one end of the laser emission receiving cylinder is provided with a first opening communicated with the inner cavity, the end face of the first opening forms a first mounting counter bore with a thread on the inner wall, the convex surface side of the probe focusing lens is outwards arranged at the first mounting counter bore through a probe focusing lens locking ring, and the probe focusing lens locking ring is in threaded fit with the inner wall of the first mounting counter bore. And further can preferably realize the encapsulation to probe focusing lens.

Preferably, the other end of the laser emission receiving cylinder is provided with a second opening communicated with the inner cavity, and the light splitting lens barrel is inserted into the second opening; the spectroscope is obliquely arranged at the inner end of the beam splitting lens cone, and the first photoelectric probe is arranged at the outer end of the beam splitting lens cone. Thereby enabling a better placement of the beam splitter.

Preferably, the outer end of the light splitting lens barrel is provided with a second mounting counter bore, and a receiving adjusting hole sleeve is sleeved in the second mounting counter bore through a receiving adjusting locking sleeve; the receiving adjusting hole sleeve is provided with a receiving small hole sleeve, and the first photoelectric probe is arranged at the receiving small hole sleeve through a first probe fixing frame. So that the mounting of the first photoelectric probe can be preferably facilitated.

Preferably, the side wall of the laser emission receiving cylinder is provided with a mounting through hole, the mounting through hole is provided with another receiving small hole sleeve, and the second photoelectric probe is arranged at the other receiving small hole sleeve through the second probe fixing frame. So that the installation of the second photoelectric probe can be preferably realized.

Preferably, the outer end of the laser emission receiving cylinder is provided with an optical fiber flange interface and a detector signal output interface, the optical fiber flange interface is connected with an optical fiber coupler of the probe focusing lens, and the detector signal output interface is connected with the first photoelectric probe and the second photoelectric probe. Through setting up optic fibre flange interface and detector signal output interface, can be convenient for signal transmission line's wiring better.

Preferably, the laser emission receiving cylinder and the inner end of the reflector fixing cylinder are both provided with a protection unit, the protection unit comprises a high-temperature-resistant quartz window piece, and the high-temperature-resistant quartz window piece is arranged at a window piece sealing cylinder through a quartz window piece fixing ring; the window sealing cylinder is connected with the laser emission receiving cylinder or the reflector fixing cylinder through an adjusting mechanism. Through setting up high temperature resistant quartz window piece, can protect the laser transceiver unit in the laser emission receiving cylinder better. And the high-temperature resistant quartz window can be obliquely arranged at the window sealing cylinder, so that the interference of specular reflection light on a detection light path can be better avoided. In addition, through setting up the solid fixed ring of quartzy window piece, can fix the quartzy window piece of high temperature resistance better, and then can prevent the landing or the shake of high temperature resistant quartzy window piece effectively to can guarantee the stability of light path better.

The invention also provides an application of any one of the transmitting-receiving same-side optical path devices in the heating furnace, wherein the laser transmitting-receiving cylinder and the reflector fixing cylinder are arranged on the side wall of the heating furnace in a matched manner so as to carry out online in-situ detection on the gas atmosphere in the heating furnace.

In the invention, the purpose of in-situ detection can be better realized by adopting the in-situ installation mode of the heating furnace; the characteristic that the total-angle reflector returns the original path of the emitted light is utilized, so that the detection optical path can be doubled, and the monitoring precision can be better improved; by applying the semi-transparent and semi-reflective principle of the spectroscope, the simultaneous online monitoring of the multi-component gas can be better realized.

Drawings

Fig. 1 is a schematic structural diagram of a transmitting-receiving same-side optical path device in embodiment 1.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.