Food-grade carbon dioxide purity detection gas chromatograph-mass spectrometer

Abstract

The application relates to the technical field of carbon dioxide detection equipment, and discloses a food-grade carbon dioxide purity detection gas mass spectrometer, which comprises a device body, a gas inlet pipe is screwed on the side surface of the device body, a steel cylinder is screwed on the end of the gas inlet pipe, a filter screen is installed in the gas inlet pipe, sealing pads are filled between the gas inlet pipe and the filter screen, a discharge electrode is installed in the gas inlet pipe, and a dust collecting electrode plate is installed in the gas inlet pipe below the discharge electrode. In the application, the electrode dust removal structure is arranged in front of the filter screen, the particles in the food-grade carbon dioxide are charged by the discharge electrode, the dust collecting electrode plate is used for adsorption, the 0.1-5 mu m particles are efficiently intercepted, a large number of tiny particles can be removed in the pretreatment step, the interception load of the filter screen is obviously reduced, the dust capacity saturation period of the filter screen is greatly prolonged, and the filter screen replacement frequency and the maintenance cost are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon dioxide detection equipment, and in particular to a gas chromatograph-mass spectrometer for detecting the purity of food-grade carbon dioxide. Background Technology

[0002] In the production and quality control process of food-grade carbon dioxide, accurately determining its purity is crucial for ensuring food safety and product quality. Gas chromatography-mass spectrometry (GC-MS), as a highly sensitive and high-resolution analytical instrument, is widely used for the purity detection of food-grade carbon dioxide. It can accurately identify and quantify trace impurities such as hydrocarbons, sulfides, moisture, and particulate contaminants. Currently, in food-grade carbon dioxide detection applications, GC-MS instruments are typically equipped with multi-stage filtration devices at the inlet to prevent impurities from entering the instrument and avoiding physical damage to core components such as the chromatographic column, ion source, and mass analyzer, thus maintaining the normal operation of the instrument.

[0003] The front-end coarse filter faces both large particles and high concentrations of fine particles, causing its dust holding capacity to saturate quickly and shortening the maintenance cycle. When the coarse filter fails or is overloaded, a large number of fine particles will break through the coarse filter and directly impact the subsequent fine filter, causing membrane pore blockage and thus reducing the service life of the fine filter. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a food-grade gas chromatograph / mass spectrometer for detecting carbon dioxide purity.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a food-grade carbon dioxide purity detection gas chromatograph-mass spectrometer, comprising a device body, an air inlet pipe screwed onto the side surface of the device body, and a steel cylinder screwed onto the end of the air inlet pipe, a filter screen installed inside the air inlet pipe, and a sealing gasket filled between the air inlet pipe and the filter screen, a discharge electrode installed inside the air inlet pipe, and a dust collection electrode plate installed inside the air inlet pipe and below the discharge electrode.

[0006] By adopting the above technical solution, an electrode dust removal structure is set in front of the filter screen. The discharge electrode charges the particles in the food-grade carbon dioxide, which are then adsorbed by the dust collection electrode plate. This achieves efficient interception of particles of 0.1-5μm. This pretreatment step can remove a large number of tiny particles, significantly reduce the interception load of the filter screen, and greatly extend the dust holding capacity saturation cycle of the filter screen, thereby reducing the frequency of filter screen replacement and maintenance costs.

[0007] Furthermore, a pulse pump is fixed to the side surface of the device body by bolts. The pulse pump is connected to a first backflush pipe through a pipe, and the surface of the first backflush pipe is provided with backflush holes. The first backflush pipe is located on one side of the internal filter screen of the air intake pipe. The first backflush pipe is connected to a second backflush pipe through a pipe, and the surface of the second backflush pipe is provided with backflush holes. The second backflush pipe is located above the internal dust collection electrode plate of the air intake pipe.

[0008] By adopting the above technical solution, and by setting a first backflush pipe, a second backflush pipe, and a pulse backflush structure of a pulse pump in the air intake pipe, the filter screen and dust collection electrode plate can be automatically cleaned. Compared with the traditional manual disassembly and cleaning method, this greatly improves maintenance efficiency and reduces labor costs and equipment downtime.

[0009] Furthermore, the side surface of the dust collection electrode plate is provided with a recessed hole, and an electric heating rod and a temperature sensor are installed inside the recessed hole. The electric heating rod and the temperature sensor are connected to a temperature controller through wires.

[0010] By adopting the above technical solution, heating raises the surface temperature of the electrode plate above the dew point, promoting the desorption of moisture and polar organic matter, avoiding electrode "poisoning" caused by condensation, and improving adsorption efficiency by 20%.

[0011] Furthermore, a drain pipe is welded through the lower surface of the air intake pipe, and a sealing valve is installed on the surface of the drain pipe.

[0012] By adopting the above technical solution, the particles detached by backflushing are discharged through the drain pipe without disassembling the air intake pipe, thus reducing downtime.

[0013] Furthermore, the dust collection electrode plate is made of 316L stainless steel, and the surface of the dust collection electrode plate is electrochemically polished. The surface of the dust collection electrode plate is coated with an anti-corrosion coating, and the anti-corrosion coating is made of nano-ceramic coating material.

[0014] By adopting the above technical solution, the corrosion resistance of the dust collection electrode plate is greatly improved.

[0015] Furthermore, an integrated controller is mounted on the front of the device body.

[0016] By adopting the above technical solution, the integrated controller can be set to a fully automated "detection-backflushing-heating" process, which can be mastered by non-professionals in 5 minutes, reducing training costs.

[0017] In summary, this utility model has the following beneficial effects:

[0018] 1. In this application, by setting an electrode dust removal structure in front of the filter screen, the particles in the food-grade carbon dioxide are charged by the discharge electrode and adsorbed by the dust collection electrode plate, so as to achieve efficient interception of 0.1-5μm particles. This pretreatment step can remove a large number of tiny particles, significantly reduce the interception load of the filter screen, greatly extend the dust holding capacity saturation cycle of the filter screen, thereby reducing the frequency of filter screen replacement and maintenance costs.

[0019] 2. In this application, by setting a first backflush pipe, a second backflush pipe and a pulse backflush structure of a pulse pump in the air intake pipe, the filter screen and dust collection electrode plate are automatically cleaned. Compared with the traditional manual disassembly and cleaning method, the maintenance efficiency is greatly improved and the labor cost and equipment downtime are reduced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the air intake pipe and its connection structure according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the discharge electrode and its connection structure according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of the first recoil tube according to an embodiment of the present invention.

[0024] In the diagram: 1. Device body; 2. Air inlet pipe; 3. Filter screen; 4. Gas cylinder; 5. Sewage pipe; 6. Discharge electrode; 7. Dust collection electrode plate; 8. Electric heating rod; 9. Pulse pump; 10. First backflush pipe; 11. Second backflush pipe; 12. Integrated controller. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] like Figure 1-4 As shown in the embodiment of this application, a gas chromatograph-mass spectrometer for detecting the purity of food-grade carbon dioxide is disclosed, including a device body 1. An air inlet pipe 2 is screwed onto the side surface of the device body 1, and a steel cylinder 4 is screwed onto the end of the air inlet pipe 2. A filter screen 3 is installed inside the air inlet pipe 2, and a sealing gasket is filled between the air inlet pipe 2 and the filter screen 3. A discharge electrode 6 is installed inside the air inlet pipe 2, and a dust collection electrode plate 7 is installed inside the air inlet pipe 2 and below the discharge electrode 6.

[0027] Device body 1 and inlet pipe 2: Inlet pipe 2 is screwed into the internal thread on the side of device body 1 via external thread, with a screw length of 25mm to ensure a sealed connection. Two O-rings (made of food-grade fluororubber) are installed at the connection, with a pressure resistance of up to 1.6MPa, to prevent CO2 leakage. The inner wall of inlet pipe 2 is mirror polished (Ra≤0.2μm) to reduce particle adsorption, ensure smooth airflow into the device, and reduce pressure loss.

[0028] Intake pipe 2 and filter screen 3: The filter screen 3 is fixed to the inner wall of the intake pipe 2 by an annular groove, forming an interference fit with the sealing gasket at the edge of the filter screen 3 to filter carbon dioxide gas.

[0029] Discharge electrode 6 and intake pipe 2: Discharge electrode 6 is fixed to the top of intake pipe 2 by ceramic insulator. The insulator and intake pipe 2 are sealed by high temperature sintering and can withstand -3kV high voltage. When -3kV high voltage is applied, corona discharge causes 0.1-5μm particles to be charged (charge-to-mass ratio ≥0.5C / kg), providing conditions for subsequent electrostatic adsorption.

[0030] A pulse pump 9 is fixed to the side surface of the device body 1 by bolts. The pulse pump 9 is connected to a first backflush pipe 10 through a pipe. The surface of the first backflush pipe 10 is provided with backflush holes. The first backflush pipe 10 is located on one side of the internal filter screen 3 of the air intake pipe 2. The first backflush pipe 10 is connected to a second backflush pipe 11 through a pipe. The surface of the second backflush pipe 11 is provided with backflush holes. The second backflush pipe 11 is located above the internal dust collection electrode plate 7 of the air intake pipe 2.

[0031] Pulse pump 9 and backflush pipe: The outlet of pulse pump 9 is connected to the first backflush pipe 10 through a compression fitting. A polytetrafluoroethylene sealing ring is provided at the fitting. Pulse pump 9 provides backflush gas. The backflush nozzle sprays airflow with a flow rate of up to 30m / s, which impacts the surface of filter screen 3 and causes the trapped particles to fall off.

[0032] First backflush pipe 10 and second backflush pipe 11: The two backflush pipes are connected by a three-way connector. The second backflush pipe 11 is parallel to the top of the dust collection electrode plate 7 and has two backflush holes. It is angled downwards and aligned with the surface of the electrode plate. During pulse backflush, the first backflush pipe 10 removes particles from the surface of the filter screen 3, and the second backflush pipe 11 peels off the charged particles adsorbed by the electrode plate. The two work together to achieve an impurity removal rate of over 95%.

[0033] The side surface of the dust collection electrode plate 7 has a recessed hole, and an electric heating rod 8 and a temperature sensor are installed inside the recessed hole. The electric heating rod 8 and the temperature sensor are connected to a temperature controller through wires.

[0034] Electric heating rod 8, temperature sensor, thermostat and dust collection electrode plate 7: The side surface of the dust collection electrode plate 7 has a recessed hole. The electric heating rod 8 and temperature sensor are fixed in the hole by thermally conductive silicone. When heated to 60°C, the desorption rate of water on the electrode plate surface increases by 5 times, avoiding electric field distortion caused by condensation and maintaining adsorption efficiency >98%.

[0035] A drain pipe 5 is welded through the lower surface of the intake pipe 2, and a sealing valve is installed on the surface of the drain pipe 5.

[0036] Sewage pipe 5: Sewage pipe 5 is welded to the bottom of air inlet pipe 2. The weld is inspected by X-ray flaw detection to ensure that there are no air holes. The particles that are backflushed and fall off enter sewage pipe 5 under the action of gravity and airflow. They can be discharged by opening the sealing valve (food-grade stainless steel ball valve). The sewage discharge efficiency is >99%.

[0037] The dust collection electrode plate 7 is made of 316L stainless steel, and the surface of the dust collection electrode plate 7 is electrochemically polished. The surface of the dust collection electrode plate 7 is coated with an anti-corrosion coating, and the anti-corrosion coating is made of nano-ceramic coating material.

[0038] Corrosion-resistant coating: A 50nm thick TiO nano-ceramic coating is deposited on the surface of an electrochemically polished 316L stainless steel substrate (roughness Ra≤0.1μm) by magnetron sputtering. The coating has a bonding strength with the substrate of >50MPa. The coating enables the electrode plate to have a corrosion rate of <0.01mm / year in CO containing 50ppm water vapor for 1000 hours. In addition, the surface hydrophobicity (contact angle 155°) reduces particle adhesion and improves the backflushing cleaning effect.

[0039] An integrated controller 12 is mounted on the front of the device body 1.

[0040] Integrated Controller 12: The integrated controller 12 is connected to components such as pulse pump 9, temperature controller, and discharge electrode 6 power supply via an aviation plug. The wires are shielded cables with an anti-interference capability of >80dB. It collects data such as temperature, pressure, and voltage in real time and automatically adjusts the backflush frequency and heating temperature to achieve fully automated control of the entire process.

[0041] The operating principle of a gas chromatograph-mass spectrometer for detecting the purity of food-grade carbon dioxide in this embodiment is as follows: A gas cylinder 4 is connected to the inlet pipe 2 via a screw-on interface, forming an initial sealing barrier. Then, a -3kV DC voltage is applied to the discharge electrode 6, creating a non-uniform electric field that causes corona discharge in neutral particles, generating positive ions and electrons. Electrons attach to the particles, making them negatively charged. Under the influence of the electric field, the charged particles move directionally towards the dust collection electrode plate 7. After electrode dust removal pretreatment, residual large particles are intercepted by the filter screen 3. After prolonged use, a pulse pump 9 is used to backflush and clean the filter screen 3 and the dust collection electrode plate 7 through the first backflush pipe 10 and the second backflush pipe.

[0042] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A food grade carbon dioxide purity detection gas chromatograph-mass spectrometer comprising a device body (1), characterized in that: An air inlet pipe (2) is screwed onto the side surface of the device body (1), and a steel cylinder (4) is screwed onto the end of the air inlet pipe (2). A filter screen (3) is installed inside the air inlet pipe (2), and a sealing gasket is filled between the air inlet pipe (2) and the filter screen (3). A discharge electrode (6) is installed inside the air inlet pipe (2), and a dust collection electrode plate (7) is installed inside the air inlet pipe (2) and below the discharge electrode (6).

2. The food grade carbon dioxide purity detection gas chromatograph-mass spectrometer according to claim 1, characterized in that: A pulse pump (9) is fixed to the side surface of the device body (1) by bolts. The pulse pump (9) is connected to a first backflush pipe (10) through a pipe. The surface of the first backflush pipe (10) is provided with backflush holes. The first backflush pipe (10) is located on one side of the internal filter screen (3) of the air inlet pipe (2). The first backflush pipe (10) is connected to a second backflush pipe (11) through a pipe. The surface of the second backflush pipe (11) is provided with backflush holes. The second backflush pipe (11) is located above the internal dust collection electrode plate (7) of the air inlet pipe (2).

3. The food grade carbon dioxide purity detection gas chromatograph-mass spectrometer according to claim 2, characterized in that: The side surface of the dust collection electrode plate (7) is provided with a recessed hole, and an electric heating rod (8) and a temperature sensor are installed inside the recessed hole. The electric heating rod (8) and the temperature sensor are connected to a temperature controller through wires.

4. The food grade carbon dioxide purity detection gas chromatograph-mass spectrometer according to claim 3, characterized in that: The lower surface of the air intake pipe (2) is welded with a drain pipe (5), and a sealing valve is installed on the surface of the drain pipe (5).

5. The food grade carbon dioxide purity detection gas chromatograph-mass spectrometer according to claim 4, characterized in that: The dust collection electrode plate (7) is made of 316L stainless steel and the surface of the dust collection electrode plate (7) is electrochemically polished. The surface of the dust collection electrode plate (7) is coated with an anti-corrosion coating, which is made of nano-ceramic coating material.

6. The food grade carbon dioxide purity detection gas chromatograph-mass spectrometer according to claim 5, characterized in that: An integrated controller (12) is mounted on the front of the device body (1).

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