Method and equipment for measuring total hydrocarbons in air separation process using carbon dioxide sensor

Abstract

The present invention relates to a method and equipment for measuring total hydrocarbons in an air separation process by using a carbon dioxide sensor. The present invention uses a catalyst to react hydrocarbons in total hydrocarbons with oxygen to generate carbon dioxide and oxygen in the absence of an open flame, and detects the content of carbon dioxide by using a carbon dioxide sensor, and then reversely calculates the specific amount of hydrocarbons in the total hydrocarbons. Compared with the prior art, the present invention eliminates the use of an open flame, thereby greatly improving safety.

Description

Technical Field

[0001] The invention relates to the technical field of overall air separation detection, and in particular to a method and equipment for measuring total hydrocarbons in an air separation process by using a carbon dioxide sensor. Background Art

[0002] At present, most of the large-scale air separation units in the world use cryogenic processes. During the production process, hydrocarbons (hereinafter referred to as total hydrocarbons) brought in by the inhaled air will accumulate in the main condenser evaporator and other parts of the air separation unit. When the total hydrocarbons reach a certain concentration, they will react with oxygen under various triggering conditions to produce a violent oxidation reaction, which will bring extremely serious consequences. In the more than 100 years since the cryogenic air separation unit was put into operation, explosion accidents caused by improper control of total hydrocarbons have occurred from time to time. Therefore, in order to ensure the safe operation of air separation units, countries around the world have formulated extremely strict control specifications for total hydrocarbons in air separation processes and require continuous online monitoring.

[0003] The hydrogen flame ionization method is the most classic method for determining the content of organic matter in gas. The hydrogen flame ionization detector (FID) formed by this method is widely used in gas chromatographs and gas total hydrocarbon analyzers due to its high selectivity and high sensitivity to hydrocarbon substances. The total hydrocarbon detection equipment in air separation units around the world also mostly uses detectors based on the hydrogen flame ionization principle; my country's standards GB / T 28125.1 "Determination of Hazardous Substances in Air Separation Process Part 1 Hydrocarbons" and GB / T8984 "Determination of Carbon Monoxide, Carbon Dioxide and Hydrocarbons in Gases", HJ1012 "Technical Requirements and Detection Methods for Portable Monitors of Total Hydrocarbons, Methane and Non-methane Total Hydrocarbons in Ambient Air and Exhaust Gases" all use flame ionization detectors (FID).

[0004] During operation, the hydrogen flame ionization detector needs to use the flame generated by the combustion of hydrogen to dissociate hydrocarbons into positive ions in the form of CH, so it must use hydrogen and open flames. At the site where the air separation unit is operating, the presence of hydrogen and open flames undoubtedly poses a great safety hazard to safe production. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method and equipment for measuring total hydrocarbons in an air separation process using a carbon dioxide sensor, aiming to solve the problems arising from the above-mentioned background technology.

[0006] The technical solution of the present invention is implemented as follows: a method for measuring total hydrocarbons in an air separation process using a carbon dioxide sensor, characterized in that it comprises the following steps:

[0007] S1: Determine the type of catalyst and conversion conditions according to the type of total hydrocarbons;

[0008] S2: introducing the total hydrocarbons, catalyst and oxygen produced by the air separation process into a catalytic converter for reaction;

[0009] S3: The carbon dioxide generated in step S2 is detected by a carbon dioxide sensor, and the carbon content in the carbon dioxide is calculated, and further converted into the amount of total hydrocarbons.

[0010] Preferably, the catalyst is palladium, platinum or zeolite catalyst, with a particle size of 20-50 microns, and the conversion temperature in step S2 is not higher than 400°C.

[0011] In addition, the present invention also provides a device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor, which uses the above method and is characterized by comprising:

[0012] Catalytic converter, for the reaction of total hydrocarbons and oxygen;

[0013] An oxygen source, used to introduce oxygen into the catalytic converter;

[0014] Carbon dioxide sensor, used to detect the amount of carbon dioxide after reaction in the catalytic converter;

[0015] The processing device is used to receive and display the data detected by the carbon dioxide sensor.

[0016] Preferably, the catalytic converter comprises:

[0017] A furnace body having a reaction chamber;

[0018] A heater, disposed on the furnace body and used to control the temperature inside the furnace body;

[0019] The feeding device at least has an inner cavity, an inlet and an outlet, and is provided with a plurality of installation areas in the inner cavity for installing catalyst containers and corresponding to the inlet. When air is introduced into the inlet, the catalyst container is blown and part of the catalyst is discharged from the outlet into the furnace body.

[0020] Preferably, the feeding device comprises:

[0021] An outer shell, having the inner cavity and the installation area, and the outlet communicated with the furnace body is provided on the outer shell, and the installation area is a recessed area provided on the circumferential side wall of the outer shell;

[0022] The inner shell is arranged in the inner cavity and is hollow, and a plurality of puncture nozzles are arranged on the side of the inner shell close to the outlet. The inner shell is provided with an air inlet pipe body, and one end of the air inlet pipe body passes through the outer shell and can be slidably connected with the outer shell. The inner shell can be raised and lowered in the inner cavity and the outlet is cleared through the puncture nozzles.

[0023] The outer shell and the inner shell are divided into a first cavity and a second cavity by a partition, and a plurality of openings connecting the first cavity and the second cavity and corresponding to the recessed area are provided on the partition, the inlet comprises a first inlet connected to the first cavity and a second inlet connected to the second cavity and located at the recessed area, the catalyst container can be installed at the recessed area in a hinged manner, when air is introduced into the first inlet, the catalyst container is tightly pressed in the recessed area by the gas, and when air is introduced into the second inlet, the catalyst container is blown up by the gas and the opening is closed.

[0024] Preferably, the catalyst container comprises:

[0025] A rotating shaft is rotatably connected to the inner walls of both sides of the recessed area;

[0026] The bag body is detachably connected to the rotating shaft and is used to store the catalyst;

[0027] A discharge port is provided on one side of the bag body close to the recessed area;

[0028] Wherein, positioning strips are provided on both side edges of the bag body, and an air cavity with both ends opened is formed in the positioning strip. When gas flows in the air cavity, the air cavity expands and is used to prop up the bag body;

[0029] The opening is set in a progressive step shape, which consists of a first part with a larger width and a second part with a narrower width. The first part is for the positioning strip to be inserted, and a sensing device is provided on the inner side wall of the first part, and the sensing device includes:

[0030] a detector, disposed on the inner side wall of the first part, and detecting the pressure exerted by the positioning strip on the inner side wall of the first part when the air cavity expands, and generating a pressure signal based on the pressure;

[0031] A processor, disposed on the partition, for receiving the pressure signal and generating a corresponding vibration signal according to the pressure signal;

[0032] The vibrator is arranged on the partition and can receive a vibration signal and generate a specific vibration frequency based on the vibration signal to drive the partition or the bag body to vibrate.

[0033] Preferably, the total hydrocarbon supply part is also included, and the total hydrocarbon supply part includes:

[0034] a first supply system for supplying gas to the second inlet;

[0035] a second supply system for supplying gas to the first supply system or the first inlet;

[0036] Wherein, the first supply system comprises:

[0037] A first air supply pipe having an input end and an output end, and forming a node at the output end;

[0038] There are a plurality of second air supply pipes connected in series at the node, and each second air supply pipe is connected to the second inlet and the air cavity respectively;

[0039] The second supply system comprises:

[0040] Gas source;

[0041] A third air supply pipe is connected to the air source and has an output end, and a control valve is installed on the output end of the third air supply pipe, the control valve has at least two output ends, and a fourth air supply pipe is connected to each output end, and the output end of each fourth air supply pipe is respectively connected to the inlet and outlet of the first air supply pipe and the first inlet;

[0042] The connecting pipe is connected between the first air supply pipe and the fourth air supply pipe connected to the first inlet, and a one-way valve and a first solenoid valve are installed on the connecting pipe.

[0043] Preferably, a gas homogenizing device is installed at the node at the output end of the first gas supply pipe, and the gas homogenizing device comprises:

[0044] The body has a first chamber and a second chamber that are spaced apart and independent from each other, and has a middle opening disposed between the first chamber and the second chamber and used to connect the two;

[0045] an air outlet, at least consisting of a first side air outlet and a second side air outlet, wherein the first side air outlet is connected to the first chamber, the second side air outlet is connected to the second chamber, the first side air outlet is connected to the air cavity through the second air supply pipe, and the second side air outlet is connected to the second inlet through the second air supply pipe;

[0046] An air inlet, at least composed of a first side air inlet and a second side air inlet, wherein the first side air inlet and the second side air inlet are both connected to the second chamber, are arranged at intervals, and are connected to the first air supply pipe through the second air supply pipe;

[0047] A movable block, at least composed of a first movable block and a second movable block, wherein the first movable block is disposed in the first chamber, and the second movable block is disposed in the second chamber;

[0048] The elastic member is composed of at least a first elastic member and a second elastic member, wherein the first elastic member is connected between the first movable block and the inner wall of the first chamber, and the first movable block can be controlled by the first elastic member to close the middle opening and / or the first side air outlet; the second elastic member is connected between the second movable block and the inner wall of the second chamber, and the second movable block can be controlled by the second elastic member to close the second side air inlet;

[0049] The control member can control the first movable block and drive the first movable block to open the middle opening.

[0050] Preferably, the control element is an electromagnet.

[0051] Preferably, a cavity penetrating both sides of the second movable block is provided on the second movable block, two ends of the cavity are connected to the upper area of ​​the second chamber and the lower area of ​​the second chamber, and a second solenoid valve is installed in the cavity.

[0052] The beneficial effects of the present invention are:

[0053] 1) The present invention uses a method of reacting hydrocarbons in the total hydrocarbons with oxygen (with the aid of a catalyst) to quantitatively convert carbon in the total hydrocarbons into carbon dioxide without an open flame, and detects the content of carbon dioxide through a carbon dioxide sensor, and then reversely calculates the total hydrocarbon content. Compared with the prior art, the present invention eliminates the use of open flames, thereby greatly improving safety;

[0054] The principle of the present invention is that under the preset reaction conditions and in an oxygen atmosphere, the total hydrocarbon can be completely oxidized, and the reaction formula is as follows:

[0055] CnHm+yO2=nCO2+1 / 2mH2O

[0056] Wherein: CnHm is a hydrocarbon molecule, n is the number of carbon atoms, m is the number of hydrogen atoms; y is the number of oxygen molecules consumed in the reaction, y=(n+1 / 4m).

[0057] In the formula, the molar amount of carbon in the total hydrocarbons is the same as the molar amount of carbon in the generated carbon dioxide. Therefore, the molar concentration of carbon in the total hydrocarbons can be obtained by converting the molar amount of carbon to determine the molar concentration of carbon dioxide, and then the total hydrocarbon content can be obtained by calculation or standard substance determination.

[0058] In an oxygen atmosphere, high temperature or catalyst can achieve the stoichiometric conversion between total hydrocarbons and carbon dioxide. The present invention selects commercially available palladium, platinum precious metal or other types of hydrocarbon oxidation catalysts, and determines the parameter conditions for the conversion of total hydrocarbons to carbon dioxide by analytical means such as gas chromatographs. The catalytic conversion conditions of the present invention are: palladium, platinum, zeolite catalysts, particle size of 20-50 microns, filling amount of 10-50 grams, and conversion temperature not higher than 400°C;

[0059] Secondly, it is also necessary to select an adaptive sensor that meets the detection requirements for long-term operation. The sensor should have a stable linear response to carbon dioxide in a pure oxygen atmosphere and be unaffected by interferences such as moisture. The use range of the carbon dioxide sensor should be selected according to the concentration range of the total hydrocarbons to be detected. The present invention uses a commercially available infrared carbon dioxide sensor. Before using the sensor, the zero point and range point are calibrated using a carbon dioxide standard substance with oxygen as the base gas.

[0060] The present invention first draws the hydrocarbon-containing gas to be measured out of the device. If the object to be measured is a low-temperature liquid, the liquid and the total hydrocarbons are completely gasified through a gasification device. The gasification device should ensure that the high-boiling-point hydrocarbon components are not enriched or lost due to low temperature and adsorption. The gasified oxygen containing the total hydrocarbon components to be measured flows through a gas flow regulating valve into the inlet of the catalytic converter. The parameters such as the catalyst and filling amount, reaction temperature, and gas flow rate in the catalytic converter should ensure the complete conversion of total hydrocarbons into carbon dioxide. The gas from the outlet of the catalytic converter enters a carbon dioxide sensor for carbon dioxide detection. The detection output of the sensor is converted into the corresponding amount of total hydrocarbons through conversion and directly displayed or transmitted.

[0061] 2) In the present invention, in order to reduce the space occupancy, the inlets for the catalyst, total hydrocarbons and oxygen are all gathered together in one place, which not only reduces the space occupation, but also, under the feeding device of the present invention, when feeding, the total hydrocarbons can push or not push the catalyst into the catalytic furnace, thereby realizing the control of the catalyst feeding, and at the same time, it will not affect the normal introduction of total hydrocarbons and oxygen. Moreover, the present invention takes into account the risk of blockage of the outlet and can use the puncture nozzle located inside to dredge the outlet, thereby ensuring the normal progress of the reaction.

[0062] 3) In the present invention, in order to improve the structural strength of the bag body and the coordination effect between the bag body and the opening, the opening is set in a stepped shape in this embodiment, and a positioning strip is set at the edge of the bag body to improve the rigidity of the bag body, so as to ensure that the bag body can close the opening like a "hard plate" structure when it is blown up by gas, and at the same time, it can avoid its distortion and ensure the normal discharge of the catalyst;

[0063] 4) Based on point 3, the present invention further provides a gas homogenizing device on the first gas supply system, which can first supply gas to the gas cavity of the positioning strip to ensure that the bag body can "enhance" its rigidity before being blown by the gas from the second inlet, thereby ensuring that it can move normally (for details, please refer to Example 2);

[0064] 5) At the same time, when air is taken in through the first inlet, the present invention can form a negative pressure in the first air supply system and press the bag tightly against the recessed area to prevent the catalyst from leaking (see Example 2 for details). BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0066] Figure 1 It is a schematic diagram of the principle of a specific embodiment of the present invention;

[0067] Figure 2 It is a structural schematic diagram of a catalytic furnace in a specific embodiment 1 of the present invention;

[0068] Figure 3 It is a structural schematic diagram of a feeding device in a specific embodiment of the present invention;

[0069] Figure 4 for Figure 3 A magnified view of part A in FIG.

[0070] Figure 5 This is a schematic diagram of the structure of the bag body in specific embodiment 2 of the present invention;

[0071] Figure 6 is a schematic diagram of the position of the recessed area in specific embodiment 2 of the present invention;

[0072] Figure 7 This is a structural diagram of a portion of the partition in the specific embodiment 2 of the present invention;

[0073] Figure 8 This is a gas supply principle diagram in specific embodiment 2 of the present invention;

[0074] Fig. 9 Schematic diagram of the gas homogenizing device in specific embodiment 2 of the present invention. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0076] Example 1

[0077] like Figure 1-4 As shown, the present invention discloses a device for measuring total hydrocarbons in an air separation process using a carbon dioxide sensor. In a specific embodiment of the present invention, the device comprises:

[0078] Catalytic converter 10, for reacting total hydrocarbons with oxygen;

[0079] An oxygen source, used to introduce oxygen into the catalytic converter 10;

[0080] A carbon dioxide sensor, used to detect the amount of carbon dioxide after reaction in the catalytic converter 10;

[0081] The processing device is used to receive and display the data detected by the carbon dioxide sensor.

[0082] In a specific embodiment of the present invention, the carbon dioxide sensor can be arranged at the output end of the catalytic converter, and the processing device of this embodiment can be an existing processor, which can realize the functions of receiving and processing the data detected by the sensor and displaying it on a computer.

[0083] In a specific embodiment of the present invention: the catalytic converter 10 comprises:

[0084] The furnace body 100 has a reaction chamber 1001;

[0085] A heater, disposed on the furnace body 100 and used to control the temperature inside the furnace body 100;

[0086] The feeding device 20 at least has an inner cavity 21, an inlet 22 and an outlet 23, and is provided in the inner cavity 21 with a plurality of installation areas 31 corresponding to the inlet 22 for installing the catalyst container 30. When air is taken into the inlet 22, the catalyst container 30 is blown, and part of the catalyst is discharged from the outlet 23 into the furnace body 100.

[0087] In a specific embodiment of the present invention: the feeding device 20 comprises:

[0088] The outer shell 200 has the inner cavity 21 and the installation area 31, and the outlet 23 communicating with the furnace body 100 is provided on the outer shell 200, and the installation area 31 is a recessed area provided on the circumferential side wall of the outer shell 200;

[0089] The inner shell 201 is arranged in the inner cavity 21 and is hollow, and a plurality of puncture nozzles 2010 are arranged on the side of the inner shell 201 close to the outlet 23. The inner shell 201 is provided with an air inlet tube 2011, and one end of the air inlet tube 2011 passes through the outer shell 200 and can be slidably connected with the outer shell 200. The inner shell 201 can be raised and lowered in the inner cavity 21 and clear the outlet 23 through the puncture nozzles 2010.

[0090] Among them, the outer shell 200 and the inner shell 201 are divided into a first chamber 211 and a second chamber 212 by a partition 40, and a plurality of openings 41 are provided on the partition 40, which are connected to the first chamber 211 and the second chamber 212 and correspond to the recessed area. The inlet 22 includes a first inlet 221 connected to the first chamber 211 and a second inlet 222 connected to the second chamber 212 and located in the recessed area. The catalyst container 30 can be installed in the recessed area in a hinged manner. When the first inlet 221 is filled with air, the catalyst container 30 is tightly pressed in the recessed area by the gas. When the second inlet 222 is filled with air, the catalyst container 30 is blown up by the gas and the opening 41 is closed.

[0091] In a specific embodiment of the present invention, the catalyst container 30 includes:

[0092] A rotating shaft 300 is rotatably connected to the inner walls of both sides of the recessed area;

[0093] The bag body 301 is detachably connected to the rotating shaft 300 and is used to store the catalyst;

[0094] The discharge port 302 is disposed on one side of the bag body 301 close to the recessed area.

[0095] In a specific embodiment of the present invention, the first cavity and the second cavity constitute the inner cavity 21 .

[0096] In a specific embodiment of the present invention, the bag body 301 and the rotating shaft 300 can be detachable in any existing detachable manner, such as: threading, that is, threaded holes are provided on the bag body 301 and the rotating shaft 300, and bolts are passed through the threaded holes to connect them.

[0097] In addition, this embodiment also provides a method for measuring total hydrocarbons in an air separation process using a carbon dioxide sensor, which is characterized by comprising the following steps:

[0098] S1: Determine the type of catalyst according to the type of total hydrocarbons;

[0099] S2: introducing the total hydrocarbons, catalyst and oxygen produced by the air separation process into a catalytic converter for reaction;

[0100] S3: The carbon dioxide generated in step S2 is detected by a carbon dioxide sensor, and the carbon content in the carbon dioxide is calculated, and further converted into the amount of total hydrocarbons.

[0101] In a specific embodiment of the present invention: the catalyst is palladium, platinum, or a zeolite catalyst, with a particle size of 20-50 microns, and the conversion temperature in step S2 is not higher than 400°C.

[0102] refer to Figure 1-4 , the principle of this embodiment is:

[0103] Firstly, the oxygen of the present invention can be selected to be vaporized by a liquid oxygen vaporization device, and the flow rate can be adjusted and monitored by a gas flow regulator. The gaseous oxygen can enter the inner shell through the air inlet pipe body, and the gaseous total hydrocarbons can first enter the second cavity through the second inlet. Since the catalyst container is pre-installed at the second inlet, when the second inlet takes in air, the catalyst container (bag body) is blown up and the opening on the partition is closed. At the same time, since the discharge port of the catalyst container is arranged on a side close to the second inlet, therefore, when the catalyst container is blown up, the discharge port is located at the bottom, the catalyst can be discharged through the discharge port and sent into the catalytic furnace through the gaseous total hydrocarbons, and the gaseous oxygen can be sprayed out through the puncture nozzle (which can be a one-way valve) and sent into the catalytic furnace through the outlet for reaction.

[0104] In addition, in this embodiment, when it is not necessary to add catalyst, gas can be supplied to the first inlet, while the second inlet is not supplied. When gas is fed into the first inlet, the gas enters the first chamber and enters the second chamber through the opening on the partition, and then enters the catalytic furnace through the outlet. In the process of the gas from the first chamber to the second chamber, the gas can press the catalyst container (i.e., the bag body) into the concave area, so the catalyst will not be discharged from the catalyst container, and at the same time, the normal addition of total hydrocarbons and oxygen can be ensured;

[0105] In this embodiment, oxygen and hydrocarbons in the total hydrocarbons react in the catalytic furnace to produce carbon dioxide. The carbon dioxide in the catalytic furnace is detected by a carbon dioxide sensor to obtain the amount of carbon dioxide. Then, by reasoning about the reaction formula, the amount of hydrocarbons in the total hydrocarbons can be inferred.

[0106] It should be noted that:

[0107] In this embodiment, the lifting and lowering of the inner shell can be controlled by the existing cylinder, motor and worm gear structure. The lifting and lowering of the inner shell can clear the puncture nozzle to the outlet. At the same time, in order to ensure the movement of the inner shell, the inner shell can be slidably connected to the partition.

[0108] Embodiment 2 is different from Embodiment 1 in that:

[0109] like Figure 5-9 As shown, in a specific embodiment of the present invention:

[0110] Positioning strips 50 are provided at both side edges of the bag body 301, and an air cavity 500 with both ends opened is formed in the positioning strip 50. When gas flows in the air cavity 500, the air cavity 500 expands and is used to prop up the bag body 301.

[0111] The opening 41 is set in a progressive step shape, which is composed of a first portion 411 with a larger width and a second portion 412 with a narrower width. The first portion 411 is for the positioning bar 50 to be inserted, and a sensing device is provided on the inner side wall of the first portion 411. The sensing device includes:

[0112] The detector 600 is disposed on the inner wall of the first portion 411 and detects the pressure exerted by the positioning strip 50 on the inner wall of the first portion 411 when the air cavity 500 expands, and generates a pressure signal based on the pressure;

[0113] A processor, disposed on the partition 40, for receiving the pressure signal and generating a corresponding vibration signal according to the pressure signal;

[0114] The vibrator 601 is disposed on the partition 40 and is capable of receiving a vibration signal and generating a specific vibration frequency based on the vibration signal to drive the partition 40 or the bag body 301 to vibrate.

[0115] In a specific embodiment of the present invention:

[0116] Also included is the total hydrocarbon supply portion, the total hydrocarbon supply portion comprising:

[0117] a first supply system for supplying gas to the second inlet 222;

[0118] A second supply system, used to supply gas to the first supply system or the first inlet 221;

[0119] Wherein, the first supply system comprises:

[0120] The first air supply pipe 71 has an input end and an output end, and forms a node at the output end;

[0121] There are a plurality of second air supply pipes 72 connected in series at the node, and each second air supply pipe 72 is connected to the second inlet 222 and the air cavity 500 respectively;

[0122] The second supply system comprises:

[0123] Gas source 700;

[0124] The third air supply pipe 73 is connected to the air source 700 and has an output end, and a control valve 730 is installed on the output end of the third air supply pipe 73. The control valve 730 has at least two output ends, and each output end is connected to a fourth air supply pipe 74. The output end of each fourth air supply pipe 74 is respectively connected to the inlet and outlet ends of the first air supply pipe 71 and the first inlet 221;

[0125] The connecting pipe 75 is connected between the first air supply pipe 71 and the fourth air supply pipe 74 connected to the first inlet 221 , and a one-way valve 751 and a first solenoid valve 752 are installed on the connecting pipe 75 .

[0126] In a specific embodiment of the present invention:

[0127] A gas homogenizing device 80 is installed at the node at the output end of the first gas supply pipe 71, and the gas homogenizing device 80 includes:

[0128] The body 800 has a first chamber 801 and a second chamber 802 which are spaced apart and independent from each other, and has a middle opening 803 which is provided between the first chamber 801 and the second chamber 802 and is used to connect the two.

[0129] The air outlet is at least composed of a first side air outlet 811 and a second side air outlet 812, wherein the first side air outlet 811 is connected to the first chamber 801, and the second side air outlet 812 is connected to the second chamber 802, the first side air outlet 811 is connected to the air cavity 500 through the second air supply pipe 72, and the second side air outlet 812 is connected to the second inlet 212 through the second air supply pipe 72;

[0130] The air inlet is at least composed of a first side air inlet 821 and a second side air inlet 822, wherein the first side air inlet 821 and the second side air inlet 822 are both connected to the second chamber 802, are arranged at intervals, and are connected to the first air supply pipe 71 through the second air supply pipe 72;

[0131] The movable block is composed of at least a first movable block 831 and a second movable block 832, wherein the first movable block 831 is disposed in the first chamber 801, and the second movable block 832 is disposed in the second chamber 802;

[0132] The elastic member is composed of at least a first elastic member 841 and a second elastic member 842, wherein the first elastic member 841 is connected between the first movable block 831 and the inner wall of the first chamber 801, and the first movable block 831 can be controlled by the first elastic member 84 to close the middle opening 803 and / or the first side air outlet 811; the second elastic member 842 is connected between the second movable block 832 and the inner wall of the second chamber 802, and the second movable block 832 can be controlled by the second elastic member 842 to close the second side air outlet 812;

[0133] The control member can control the first movable block 831 and drive the first movable block 831 to open the middle opening 803 .

[0134] In a specific embodiment of the present invention:

[0135] The control component is an electromagnet.

[0136] In a specific embodiment of the present invention:

[0137] The second movable block 832 is provided with a cavity 90 that passes through both sides of the second movable block 832 , and the two ends of the cavity 90 are connected to the upper area of ​​the second chamber 802 and the lower area of ​​the second chamber 802 , and a second solenoid valve 91 is installed in the cavity 90 .

[0138] refer to Figure 5-9 The principles and advantages of this embodiment are:

[0139] In this embodiment, the bag body is provided with a positioning strip which can strengthen the structural strength of the periphery of the bag body, and can cooperate with the first part of the opening so that when the bag body is blown up by taking in air from the second inlet, the bag body can completely close the second part of the opening (the second part is the open mouth). At the same time, in order to facilitate the bag body to have a certain "rigidity" when being blown up, an air cavity is provided in the positioning strip in this embodiment. The provision of the air cavity can not only provide a certain buffering effect for the positioning strip, but also, when air is supplied inside (one end of the air cavity can be connected to the second air supply pipe through an air pipe), the air cavity can be closed by the second air supply pipe. (connection), since the diameter of the air cavity is small, and when the air flow is large, the pressure bearing (or impact resistance) and rigidity of the air cavity will increase, therefore, when it is impacted by the gas from the second inlet, it will not be like a soft bag, but will be blown up like a "hard board" to close the opening, and at the same time, the other end of the air cavity is open, so the gas in the air cavity can be discharged, and therefore, the air cavity will not be over-exploded and produce the phenomenon of "explosion". At the same time, since this part of the gas can be discharged and also enters the catalytic furnace through the outlet, the accuracy of the subsequent calculation can also be ensured;

[0140] Secondly, the air cavity of the present embodiment has another advantage that when the bag body is blown to the first part of the opening, the air supply in the air cavity is large, and the caliber of the air cavity is small. Although the gas can be discharged from the other end of the air cavity, the positioning strip will still expand due to the intake of air. When the positioning strip (the positioning strip can be made of rubber or nano materials, with high toughness and certain elasticity) expands, it will generate pressure on the detector. The detector detects the pressure information and feeds it back to the processing device (which can be an existing processor), processes the pressure information, and sends a vibration signal to the vibrator, so that the vibrator vibrates, thereby driving the bag body or the partition to vibrate, which can facilitate the discharge of the catalyst inside the bag body; at the same time, the present embodiment can adjust the vibration frequency of the vibrator according to the pressure detected by the detector, and the pressure on the detector can be determined according to the amount of air supply. Therefore, the present embodiment only needs to control the air flow rate in terms of control, so as to achieve the purpose of convenience and high efficiency;

[0141] In addition, refer to Figure 8-9In the present embodiment, a first gas supply system and a second gas supply system are provided for the distribution and use of the total hydrocarbon gas. The control valve can be adjusted to determine whether to supply gas to the first inlet or the second inlet. At the same time, a connecting pipe is provided between the fourth gas supply pipe connected to the first inlet and the first gas supply pipe. The one-way valve provided on the connecting pipe can only allow the gas to flow from the first gas supply pipe to the fourth gas supply pipe. When not in use, the first solenoid valve is closed. At this time, the connecting pipe is in a normally closed state. At this time, the control valve can be used to determine whether to supply gas to the first inlet or the second inlet. When gas is supplied to the first inlet, the first solenoid valve is opened. Due to the high-speed gas flowing in the fourth gas supply pipe connected to the first inlet, when the gas flow rate reaches a certain level, When the pressure is too high, the fourth air supply pipe generates a negative pressure, so that part of the gas in the first air supply pipe will enter the fourth air supply pipe through the one-way valve and the first solenoid valve and be sent to the first inlet. At this time, when the first inlet and the second inlet are not supplying air, the amount of gas in the first air supply pipe is reduced, and a negative pressure will be generated in the first air supply pipe (and the second air supply pipe). Therefore, the air pressure in the second cavity will be higher than the air pressure in the first air supply pipe or the second air supply pipe. Therefore, the bag body will be pressed only in the recessed area and can only be blown up when air is supplied from the second inlet. The bag body can be effectively fixed, and the discharge port of the bag body is close to the second inlet. Therefore, the catalyst in the bag body will not be discharged at will, thereby controlling the consumption of the catalyst and ensuring the normal reaction inside the catalytic furnace.

[0142] In addition, the present embodiment is also provided with a gas homogenizing device, which can separate the gas of the first gas supply pipe and send the gas into the air cavity of the positioning strip or the second inlet respectively. In the present embodiment, first, the electromagnet is energized, and attracts the first movable block to move, and opens the middle port and the first side air outlet. Since the first side air inlet and the second side air inlet take in air at the same time, and the first movable block moves first, the second side air outlet can be made to discharge gas first and send it into the air cavity of the positioning strip, so that the air cavity expands, and the rigidity of the bag body is increased first (if the bag body does not have rigidity, it may not be able to effectively close the opening when it is blown up. If the opening is not closed, the gas will enter the opening and then enter the first cavity, affecting the reaction efficiency). At this time, due to Gas flows in the upper area of ​​the second chamber (forming negative pressure). Therefore, when air is taken in by the second side air inlet, the gas at the second side air inlet will lift up the second movable block, open the second side air outlet, and supply air to the second inlet. Then, when the bag body is blown up, the bag body has a certain hardness, and it can also ensure that the gas at the second inlet can effectively blow up the bag body to the opening; and the cavity and the second solenoid valve arranged on the second movable block can cooperate with one point to fix the bag body, that is: when negative pressure is formed in the first air supply pipe, the second solenoid valve opens, so that the first air supply pipe and the second air supply pipe are connected, ensuring the fixation of the bag body, and when the air uniforming device needs to be used normally, the second solenoid valve is closed, and the normal activity of the second movable block can close or open the second side air outlet.

[0143] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor, characterized in that: include: Catalytic converter, for the reaction of total hydrocarbons and oxygen; An oxygen source, used to introduce oxygen into the catalytic converter; Carbon dioxide sensor, used to detect the amount of carbon dioxide after reaction in the catalytic converter; A processing device, used for receiving and displaying data detected by the carbon dioxide sensor; The catalytic converter comprises: A furnace body having a reaction chamber; A heater, disposed on the furnace body and used to control the temperature inside the furnace body; A feeding device, the feeding device at least having an inner cavity, an inlet and an outlet, and a plurality of installation areas capable of installing catalyst containers and corresponding to the inlet are provided in the inner cavity, when air is introduced into the inlet, the catalyst container is blown, and part of the catalyst is discharged from the outlet into the furnace body; The feeding device comprises: An outer shell, having the inner cavity and the installation area, and the outlet communicated with the furnace body is provided on the outer shell, and the installation area is a recessed area provided on the circumferential side wall of the outer shell; The inner shell is arranged in the inner cavity and is hollow, and a plurality of puncture nozzles are arranged on the side of the inner shell close to the outlet. The inner shell is provided with an air inlet pipe body, and one end of the air inlet pipe body passes through the outer shell and can be slidably connected with the outer shell. The inner shell can be raised and lowered in the inner cavity and the outlet is cleared through the puncture nozzles. The outer shell and the inner shell are divided into a first cavity and a second cavity by a partition, and a plurality of openings connecting the first cavity and the second cavity and corresponding to the recessed area are provided on the partition, the inlet comprises a first inlet connected to the first cavity and a second inlet connected to the second cavity and located at the recessed area, the catalyst container can be installed at the recessed area in a hinged manner, when air is introduced into the first inlet, the catalyst container is tightly pressed in the recessed area by the gas, and when air is introduced into the second inlet, the catalyst container is blown up by the gas and the opening is closed.

2. The device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor according to claim 1, characterized in that: The catalyst container comprises: A rotating shaft is rotatably connected to the inner walls of both sides of the recessed area; The bag body is detachably connected to the rotating shaft and is used to store the catalyst; A discharge port is provided on one side of the bag body close to the recessed area; Wherein, positioning strips are provided on both side edges of the bag body, and an air cavity with both ends opened is formed in the positioning strip. When gas flows in the air cavity, the air cavity expands and is used to prop up the bag body; The opening is set in a progressive step shape, which consists of a first part with a larger width and a second part with a narrower width. The first part is for the positioning strip to be inserted, and a sensing device is provided on the inner side wall of the first part, and the sensing device includes: a detector, disposed on the inner side wall of the first part, and detecting the pressure exerted by the positioning strip on the inner side wall of the first part when the air cavity expands, and generating a pressure signal based on the pressure; A processor, disposed on the partition, for receiving the pressure signal and generating a corresponding vibration signal according to the pressure signal; The vibrator is arranged on the partition and can receive a vibration signal and generate a specific vibration frequency based on the vibration signal to drive the partition or the bag body to vibrate.

3. The device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor according to claim 2, characterized in that: Also included is a total hydrocarbon supply portion, the total hydrocarbon supply portion comprising: a first supply system for supplying gas to the second inlet; a second supply system for supplying gas to the first supply system or the first inlet; Wherein, the first supply system comprises: A first air supply pipe having an input end and an output end, and forming a node at the output end; There are a plurality of second air supply pipes connected in series at the node, and each second air supply pipe is connected to the second inlet and the air cavity respectively; The second supply system comprises: Gas source; A third air supply pipe is connected to the air source and has an output end, and a control valve is installed on the output end of the third air supply pipe, the control valve has at least two output ends, and a fourth air supply pipe is connected to each output end, and the output end of each fourth air supply pipe is respectively connected to the inlet and outlet of the first air supply pipe and the first inlet; The connecting pipe is connected between the first air supply pipe and the fourth air supply pipe connected to the first inlet, and a one-way valve and a first solenoid valve are installed on the connecting pipe.

4. The device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor according to claim 3, characterized in that: A gas homogenizing device is installed at the node at the output end of the first gas supply pipe, and the gas homogenizing device includes: The body has a first chamber and a second chamber that are spaced apart and independent from each other, and has a middle opening disposed between the first chamber and the second chamber and used to connect the two; an air outlet, at least consisting of a first side air outlet and a second side air outlet, wherein the first side air outlet is connected to the first chamber, the second side air outlet is connected to the second chamber, the first side air outlet is connected to the air cavity through the second air supply pipe, and the second side air outlet is connected to the second inlet through the second air supply pipe; An air inlet, at least composed of a first side air inlet and a second side air inlet, wherein the first side air inlet and the second side air inlet are both connected to the second chamber, are arranged at intervals, and are connected to the first air supply pipe through the second air supply pipe; A movable block, at least composed of a first movable block and a second movable block, wherein the first movable block is disposed in the first chamber, and the second movable block is disposed in the second chamber; The elastic member is composed of at least a first elastic member and a second elastic member, wherein the first elastic member is connected between the first movable block and the inner wall of the first chamber, and the first movable block can be controlled by the first elastic member to close the middle opening and / or the first side air outlet; the second elastic member is connected between the second movable block and the inner wall of the second chamber, and the second movable block can be controlled by the second elastic member to close the second side air inlet; The control member can control the first movable block and drive the first movable block to open the middle opening.

5. The device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor according to claim 4, characterized in that: The control component is an electromagnet.

6. The device for measuring total hydrocarbons in air separation process using a carbon dioxide sensor according to any one of claims 4 to 5, characterized in that: The second movable block is provided with a cavity penetrating through both sides of the second movable block, the two ends of the cavity are connected to the upper area of ​​the second chamber and the lower area of ​​the second chamber, and a second solenoid valve is installed in the cavity.

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