37 results about "Oxygen Content Measurement" patented technology

A method of diagnosing cerebrovascular autoregulation in a patient includes measuring blood pressure of the patient, measuring, non-invasively, venous oxygen content of the patient's brain substantially simultaneously with the measuring blood pressure, correlating the blood pressure and the venous oxygen content measurements in a time domain, and determining a cerebrovascular autoregulation state of the patient based on the correlating the blood pressure and the venous oxygen content measurements.

The invention relates to an online measurement and control method for the combustion status of a steel rolling heating furnace. Aiming at the method of detecting the residual oxygen in the flue of the traditional heating furnace, it is difficult to independently control the combustion atmosphere in different sections of the heating furnace, the combustion efficiency is low, and the billet is oxidized and burned too much. Many more questions. The present invention installs the oxygen analyzer at the combustion gas outlet of each section on the top of the heating furnace to measure the oxygen content of the combustion atmosphere in different sections of the furnace online, and then based on the oxygen content measurement value, the excess air in the corresponding section The coefficient is adjusted online to realize the precise control of the oxygen content in the combustion atmosphere in different sections of the heating furnace. The invention can help the operator to automatically operate the combustion status of the heating furnace within the required range, realize accurate measurement and control of the combustion status of different sections, improve the combustion efficiency of the heating furnace, reduce the oxidation and burning loss of the billet, and improve the performance and yield of the product. Important engineering application promotion value.

A device for measuring blood oxygen content comprises a blood oxygen sensor interface, a signal processing unit, and a plurality of voltage sampling points. A method for detecting fault in a blood oxygen sensor comprises the steps of: connecting the blood oxygen sensor to the signal processing unit; providing voltage signals by the signal processing unit via a pair of testing terminals, for alternately driving two LEDs connected in inverse-parallel with each other in the blood oxygen sensor; sampling the voltages of the pair of testing terminals, respectively, and determining the fault relevant to the LEDs based on the relationship of the voltages; receiving current signals from a photodiode in the blood oxygen sensor by the signal processing unit via another pair of terminals, converting the received current signals into voltage signals, and outputting positive voltage signals via a reverser and a follower, respectively; and sampling the positive voltage signals respectively for determining the fault relevant to the photodiode. Thus, the fault of the sensor can be detected and determined by employing a plurality of sampling points without the tissue to be measured of the human body, thereby the output error due to the faults of the sensor can be avoided, and the device can be maintained conveniently.

The invention discloses a special transport box for living aquatic products and a transport method. The method is characterized in that: the living aquatic products are treated at a low temperature so that the living aquatic products are transported in a dormancy state, the temperature of the transport box adopted during transporting is regulated through a cold-hot exchanger, and the aquatic products are partitioned by using layered trays to reduce the contact density of the aquatic products and avoid mechanical injury. The transport box consists of a box body, a temperature detector, a temperature control electromagnetic valve, a heat exchange valve, a cold exchange valve, the cold-hot exchanger, the layered trays, tray pores, an oxygen content measurement instrument, an oxygen inlet, an air exhaust port, an air inlet, an air inlet electromagnetic valve, an exhaust port electromagnetic valve and an oxygen generator. After the aquatic products are transported to the site, the aquatic products are resuscitated by adding oxygen and fresh seawater. The transport box has the characteristics of reasonable design, high transport number, little mechanical injury of the aquatic products, high survival rate and low cost.

A synergistic precise control device and method for automatic oxygen addition and ammonia addition for water supply in a power plant are disclosed. The device includes an automatic oxygen addition andammonia addition synergistic controller, a fed water oxygen addition system and a condensed water ammonia addition system, and mainly includes a PLC automatic oxygen addition and ammonia addition synergistic controller, an oxygen addition pressure reducing valve, an oxygen addition electromagnetic regulating valve, an oxygen addition pressure stabilizer, an ammonia addition metering pump, and other components. A fed water hydrogen conductivity signal is inputted to the PLC automatic oxygen addition and ammonia addition synergistic controller; when the fed water hydrogen conductivity is less than 0.15 [mu]S / cm, the appropriate oxygen amount and ammonia amount are controlled; when the fed water hydrogen conductivity is higher than 0.15 [mu]S / cm, an oxygen addition electric turn-off valve isturned off to stop oxygen addition and the ammonia amount is properly increased. Feedforward PID regulation is performed on oxygen addition according to a result of comparing a measured value of thedissolved oxygen content in fed water with a set value of the dissolved oxygen content by adopting a unit load as feedforward, thus achieving precise oxygen addition control. Feedforward PID regulation is performed on ammonia addition according to a result of comparing a measured value of conductivity of a deaerator inlet with a set value of the conductivity by adopting a unit load as feedforward,thus achieving precise ammonia addition control.

The invention relates to a BFG boiler air supply optimization control method. The BFG boiler air supply optimization control method comprises the following steps that a flue gas oxygen content settingvalue of a target BFG boiler subtracts a flue gas oxygen content measurement value to obtain a flue gas oxygen amount deviation signal; the flue gas oxygen amount deviation signal is input into a PIcontroller, and the PI controller calculates the PI operation output amount based on control parameters; an air volume command is obtained through conversion of the blast furnace coal gas header coalgas flow rate; the air volume command is calculated through an oxygen amount correction command to obtain an air volume given value; the air volume given valve subtracts the actual measurement total air volume to obtain an air supply volume adjustment deviation signal; the air supply volume adjustment deviation signal is subjected to PI operation to obtain the blower variable frequency input quantity; and the blower variable frequency input quantity is used for adjusting the blower output. The BFG boiler air supply optimization control method enables air supply frequency conversion control torespond to the flue gas oxygen content deviation change to conduct continuous adjustment, quick response to the amount of the fuel quantity can be achieved, boiler combustion is stabilized, the systeminternal disturbance is suppressed, and the operational stability of a generator set is improved.

The invention discloses a pulse blood oxygen monitoring system and a pulse blood oxygen monitoring method for realizing more accurate calibration by adding a reference light source, belonging to the technical field of pulse blood oxygen monitoring. It can solve the problem of low precision caused by approximate processing in the existing calculation process. Methodology used: On the basis of 660 nm and 940 nm light sources used in blood oxygen probe, A reference light source with the wavelength of 800 nm is added to calibrate the system. The improved three light source probe is used in the signal acquisition part of the system calibration to avoid the approximate treatment in the formulated simplification of the calculation process of the information processing part, which makes the calculation formula of blood oxygen saturation more accurate. 800 nm and 660 nm, 800 nm and 940 nm, 660 nm and 940 nm light source were used for calibration, respectively, and 660 nm and 940 nm light sourcewere still used for actual measurement. The invention has the advantages that more accurate system parameters are obtained, and the blood oxygen content measurement value is more accurate.

The invention provides a smoke oxygen content measurement method and system. The system comprises a main flue, an air preheater, a dust collector, a bypass flue and an oxygen content measurement device, wherein the air preheater is arranged in the main flue; the dust collector is used for collecting smoke to be tested from the main flue at the front end of the air preheater and carrying out dust removal treatment on the smoke to be tested; the bypass flue is used for sending the smoke to be tested, subjected to the dust removal treatment by the dust collector, to the main flue at the rear endof the air preheater; and the oxygen content measurement device is used for detecting the oxygen content of the smoke to be tested in the bypass flue and outputting detected oxygen content data. Based on the technical scheme of the invention, a zirconium oxide probe can be prevented from being contaminated by dust, and the smoke oxygen content can be accurately measured.

An aerobic garbage disposal device setting draught fan beside garbage heap and its control method comprise the following steps: connecting ventilating duct with air outlet of fan; setting air outlet of fan in garbage heap; equipping air content measuring apparatus and temperature measuring apparatus in garbage heap; sending measurement result of measuring instrument into data input pin of controller; control pin of said controller connecting with switch of fan. Said air content measuring apparatus is oxygen measurement set or carbon dioxide measurement set. The invention reduces bad odour from garbage heap, accelerates biochemical aerobic reaction, decreases secondary garbage pollution, increases heating value of garbage, decreases energy consumption of burning plant and decreases cost of garbage disposal system.

The invention discloses a method for measuring oxygen content in iron powder. The method comprises the following steps: preparing testing materials, manufacturing a pressed blank, sintering, measuring and calculating the oxygen content. The method needs no relevant professional operators, and only ordinary instruments such as a material testing machine, a sintering furnace, a carbon sulfur analyzer and the like in a powder metallurgy plant need to be adopted, so that the method is convenient to operate and economic and practical. Oxygen content standard exceeding in iron powder can be effectively detected at any time, so that the phenomenon that relevant property of a final product is reduced is prevented; the invention disclose a novel testing method which is beneficial to study on oxygen content measurement in iron powder.

The invention provides an online measurement system and method for the backflow oxygen content of diffused gas at the top of a coking tank. The system comprises a diffused gas pipeline oxygen content measurement instrument AT01 arranged on a diffused gas backflow pipe; the system further comprises a nitrogen supplementing pipe and a nitrogen supplementing pipeline adjusting valve AV01 arranged on the nitrogen supplementing pipe. Before a diffused gas backflow pipeline enters a gas pipeline, the oxygen content control in a tank top diffused gas fault state is realized by adding a mode of automatically controlling the nitrogen supplement amount, so that the diffused gas backflow oxygen content is controlled within an allowable emission range, and the online maintenance of the diffused gas fault becomes possible. An intelligent analysis method is adopted to monitor the oxygen content control process amount of diffused gas in real time, intelligent diagnosis results of diffused gas faults under different conditions are timely and accurately given out, corresponding fault maintenance suggestions are given out according to the intelligent results given out by an expert system, and the quantification degree of the faults is given out. And the bleeding gas fault diagnosis and automatic control level in the gas purification process is improved.

The invention relates to a method for determining the oxygen content of a device for steam-methane reforming for hydrogen production. The method is as below: collecting the flow of natural gas and analytical gas in the device for steam-methane reforming for hydrogen production; calculating the amount of air needed for combustion by using the flow of natural gas and analytical gas; calculating the oxygen content by using the amount of air needed for combustion; and comparing the calculated oxygen content and the data detected by an oxygen content measuring instrument, so as to finish the determination of the oxygen content of the device for steam-methane reforming for hydrogen production. Compared with the prior art, the method provided by the invention gives comprehensive consideration of the influence factors and accurately calculates, can accurately obtain the accuracy of the oxygen content measuring instrument, increases fuel utilization rate and can be used in the calculation of the existing conversion furnace. Once the air quantity changes in the operation, the reason of fault can be determined rapidly.

The invention discloses a portable oxygen content quick detector, which belongs to the field of photoelectricity. The portable oxygen content quick detector comprises an LED (Light Emitting Diode) light source group and a detection window, wherein the LED light source group is connected with a collimating mirror; a collimating system is arranged in the LED light source group; an air inlet and an air outlet are arranged above the detection window; four attaching clamps and a photoelectric conversion device are arranged in the detection window; the photoelectric conversion device is connected with a galvanometer; the detection window is subjected to shading treatment; a membrane sensor is a detection membrane which contains hemoglobin; the membrane sensor is fixed on a white backboard through the attaching clamps, and ray is reflected to the photoelectric conversion device. According to the portable oxygen content quick detector disclosed by the invention, detection cost is greatly lowered, in addition, a complex step of the oxygen content measurement of a traditional method is avoided, oxygen contents can be quickly and accurately measured, and in addition, pollution caused to environment by chemical reagent in a traditional method is avoided.

The invention discloses an oxygenating device for a station boiler and water supply and an oxygenating method thereof. The oxygenating device comprises an oxygen content measurement module, an oxygen supply and an oxygen flow regulation module, wherein, the oxygen content measurement module is used for measuring the dissolved oxygen content of condensed water at an entrance of a pump package of acondensed water pump for a station boiler; the oxygen supply is used for supplying oxygen required by oxygen supplementation; and the oxygen flow regulation module is connected with the oxygen supply, can be inserted into the entrance of the pump package of a condensed water pump, and is used for controlling the flow oxygenating to condensed water according to the dissolved oxygen content output by the oxygen content measurement module. The method and the device are used in the mode of water supply weak oxidizing treatment (or AVT(O)) of a high parameter machine set of a station so as to supply, regulate and control the dissolved oxygen of the condensed water and economizer supply water, which is in accordance with the requirements of weak oxidizing treatment. By the regulation and the design of oxygenating points and flow, the invention simplifies a system, increases the safe reliability of the system, stabilizes the oxygenation differential pressure and simplifies control.