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CN-121978046-A - Optical sensor for measuring gas components of mixing equipment

CN121978046ACN 121978046 ACN121978046 ACN 121978046ACN-121978046-A

Abstract

The application discloses a gas component measurement optical sensor of mixing equipment, and belongs to the technical field of gas component detection. The measuring device comprises a plurality of measuring units which are arranged, wherein each measuring unit comprises a laser and a detector, the measuring units further comprise an optical assembly, an air suction cavity, an open cavity and a main hollow roof prism which are sequentially arranged along the direction of an incident light beam emitted by the laser, the optical assembly is in sealing connection with the air suction cavity, the air suction cavity is communicated with the open cavity, and the laser and the detector are arranged at the same end of the optical assembly. The application realizes compact layout of each structure in the measuring unit, and forms a plurality of round trip light paths in the gas absorption tank formed by the air suction cavity and the open cavity by utilizing the reflection of the main hollow roof prism and the optical component on the incident light beam, thereby ensuring the absorption light paths required by various gas detection and meeting the measurement requirements of mixing equipment with various sizes.

Inventors

  • RUAN JUN
  • NIE WEI
  • XU ZHENYU
  • KAN RUIFENG
  • YI JIANHUA
  • SUN ZHIHUA
  • CHEN CHAO

Assignees

  • 中国科学院合肥物质科学研究院
  • 西安近代化学研究所

Dates

Publication Date
20260505
Application Date
20260408

Claims (12)

  1. 1. A mixing device gas composition measuring optical sensor, characterized by comprising several arrangements of measuring units, said measuring units comprising a laser (201) and a detector (202); The measuring unit further comprises an optical component, an air suction cavity (203), an open cavity and a main hollow roof prism (302) which are sequentially arranged along the direction of an incident light beam (401) emitted by the laser (201), wherein the optical component is in sealed connection with the air suction cavity (203), and the air suction cavity (203) is communicated with the open cavity; the laser (201) and the detector (202) are arranged at the same end of the optical assembly.
  2. 2. A mixing device gas composition measurement optical sensor according to claim 1, characterized in that the optical assembly comprises an entrance sealing window (208), an exit sealing window (211) and several secondary hollow roof prisms, the primary hollow roof prism (302) and the secondary hollow roof prism being arranged opposite each other.
  3. 3. A mixing device gas composition measuring optical sensor according to claim 2, characterized in that the primary hollow roof prism (302) and the secondary hollow roof prism are each composed of two mirrors assembled opposite to each other; The incident light beam (401) is reflected by the main hollow roof prism (302) to form a first reflected light beam (402), and an intersection line (304) of two reflectors of the main hollow roof prism (302) is perpendicular to a plane formed by the incident light beam (401) and the first reflected light beam (402).
  4. 4. A mixing device gas composition measuring optical sensor according to claim 3, characterized in that the mirror surfaces of the two mirrors of the primary hollow roof prism (302) and the secondary hollow roof prism are arranged opposite each other at an angle of 90 °; The optical component is in sealing connection with the air suction cavity (203) through a first base (207), and is embedded in the first base (207); The incidence sealing window sheet (208) and the emergent sealing window sheet (211) are hermetically embedded in the first base (207).
  5. 5. A mixing device gas composition measuring optical sensor according to claim 4, wherein the number of secondary hollow roof prisms is two, the bonding surfaces (500) of both secondary hollow roof prisms being 90 ° to the bonding surfaces (500) of the primary hollow roof prism (302).
  6. 6. A mixing device gas component measurement optical sensor according to claim 1, characterized in that the open cavity is constituted by an inner mesh tube (300); the main hollow roof prism (302) is fixed at the end part of the open cavity through a second base (301), and the main hollow roof prism (302) is embedded in the second base (301).
  7. 7. The optical sensor for measuring gas components of a mixing device according to claim 1, further comprising a box body (200), wherein the box body (200) is covered on the peripheries of the lasers (201), the detectors (202), the optical components and the suction cavities (203) of a plurality of measuring units, a mounting part (205) is arranged at the joint of the suction cavities (203) and the open cavities, the open cavities are arranged outside the box body (200), and the bottom wall of the box body (200) is sealed by the mounting part (205); The wall surface of the box body (200) provided with the installation part (205) is provided with an extraction opening (215); the top of the box body (200) is provided with a vent hole (217).
  8. 8. A mixing device gas composition measuring optical sensor according to claim 1, characterized in that the suction cavity (203) is connected with a gas conduit (214).
  9. 9. A mixing device gas composition measuring optical sensor according to claim 1, characterized in that the measuring unit further comprises a heat sink (204), the laser (201) and the detector (202) being embedded side by side on the heat sink (204); the optical assembly further comprises a reflector group, wherein the reflector group comprises two reflectors, and the reflector group is matched with the laser (201) and the detector (202) respectively.
  10. 10. A mixing device gas composition measuring optical sensor according to claim 9, characterized in that the measuring unit further comprises a branching gas circuit cooling plate (213), the branching gas circuit cooling plate (213) being arranged on top of several arrays of the cooling fins (204) and communicating with a vent hole (217).
  11. 11. The optical sensor for measuring gas components of a mixing device according to claim 1, wherein the measuring unit further comprises a cover net drum (303), and the cover net drum (303) is covered on the periphery of a plurality of open cavities; the outer cover net drum (303) is a net drum formed by two layers of nets, and the mesh diameter of the inner layer net is smaller than that of the outer layer net.
  12. 12. The mixing device gas component measurement optical sensor according to claim 1, further comprising a mounting flange (103), the mounting flange (103) being sealingly connected to the bottom wall of the tank (200) and the measurement unit being sealingly mounted to the mounting site (101) of the mixing device (100) by means of the mounting flange (103), and the open cavity being located within the mixing device (100); The installation place (101) is a sight glass opening or an idle charging opening of the mixing equipment (100).

Description

Optical sensor for measuring gas components of mixing equipment Technical Field The application belongs to the technical field of gas component detection, and particularly relates to a gas component measurement optical sensor of mixing equipment. Background The explosive as core material of energetic material has the production process involving multi-step complex chemical reactions such as nitration, esterification, amination, etc., the generation and consumption of various characteristic gases can be accompanied in the mixing equipment, and the dynamic changes of gas components and concentration directly reflect the reaction progress, material conversion rate and reaction safety. The accurate and real-time capture of the gas information is a key premise for realizing closed-loop control of the explosive production process, improving the quality consistency of products and avoiding safety risks (such as explosion hidden danger caused by overreaction and local overheating). At present, gas measurement in mixing equipment in the explosive production process mainly depends on offline sampling analysis and traditional online detection technology, and the two technologies have the bottleneck which is difficult to break through, so that the requirements of modern explosive production on in-situ, online, high-frequency response and multicomponent synchronous measurement cannot be met. The offline sampling analysis technology (such as gas chromatography and mass spectrometry) has higher component identification precision and concentration measurement accuracy, but has inherent defects that firstly, the tightness of a reaction system is required to be interrupted in the sampling process, the raw materials and products for producing the explosives and the powders are mostly inflammable and explosive and toxic harmful substances, the sampling process is easy to cause leakage risks, the production safety is endangered, secondly, the sampling, transmission, pretreatment and detection periods are long (usually several minutes to several hours), the dynamic change of gas in the mixing equipment cannot be reflected in real time, the measurement result is delayed from the actual reaction process, the real-time regulation and control of technological parameters are difficult to support, the batch difference of products is easy to cause, and even safety accidents are caused due to the fact that abnormal gas accumulation cannot be found in time, thirdly, the gas components are easy to be adsorbed, decomposed or cross-polluted in the sampling process, the measurement result is distorted, and the reliability of technological judgment is influenced. Although the traditional online detection technology (such as an infrared absorption method, an electrochemical sensor method and a catalytic combustion method) compensates the hysteresis of offline detection to a certain extent, the traditional online detection technology has obvious defects in applicability of explosive production scenes. The infrared absorption method is limited by spectral line overlapping interference, the multi-component measurement capability is weak, the tolerance to water vapor and dust under complex working conditions is poor, the detection precision is easily reduced greatly due to trace dust and water vapor generated in the process of explosive reaction, the electrochemical sensor method is strong in pertinence, only single or few gases can be measured, the requirement of synchronous monitoring of the explosive reaction multi-component gases cannot be met, the sensor is easy to age and lose efficacy due to the influence of corrosive gases and impurities in a reaction system, the service life is short, frequent replacement is required, the production cost and maintenance workload are increased, meanwhile, the replacement process is required to be interrupted for detection, potential safety hazards exist, the catalytic combustion method is only suitable for measuring combustible gases, the measurement range is narrow, and the process monitoring requirement cannot be covered on the whole surface due to the non-response capability to common nitro compounds, amines and other characteristic gases in the explosive production. In addition, the safety and in-situ property requirements of the explosive production on the detection technology are strict. The mixing equipment needs to keep airtight and explosion-proof working conditions, the traditional detection equipment is difficult to directly embed into the mixing equipment to realize in-situ measurement, bypass sampling detection is adopted, the problems of transmission delay, component loss and the like still exist, meanwhile, the detection equipment needs to have explosion-proof and anti-interference capabilities, ignition and detonation risks on an explosive reaction system are avoided, and the traditional detection technology is difficult to consider measurement performance and safety requirements in explosi