Preposed purification system of detection instrument

Abstract

The utility model discloses a preposed purification system of a detection instrument, which comprises an automatic sample injector, a cracking furnace and a mode dryer, the automatic sample injector is arranged at the top of the cracking furnace, a sample in the cracking furnace is vaporized and enters a purifier through a sample feeding pipe, the purifier is connected with the mode dryer through a gas sample pipe, and the sample is fed into a reaction chamber after being dried; the purifier comprises a purification chamber, a distributor and purification liquid, the distributor which is located in the purification chamber and used for distributing gas samples is arranged at the output end of the sample feeding pipe, and the gas samples are evenly distributed in the purification liquid stored in the purification chamber. According to the front purification system of the detection instrument, the purifier is additionally arranged between the cracking furnace and the mode dryer, and after black carbon, impurities and a gas sample pass through the purifier, most of the black carbon and the impurities can be filtered, so that the service life of the mode dryer is prolonged, and the mode dryer and reaction and optical signal processing equipment can be effectively protected; the damage probability and frequency are reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of the determination of nitrogen content in petroleum and petroleum products, in particular to a pre-purification system of a chemiluminescence nitrogen analyzer. Background Technique

[0002] The chemiluminescence nitrogen analyzer adopts the chemiluminescence detection principle. After the sample to be measured (or standard sample) is introduced into the high-temperature cracking furnace, at a high temperature of about 1050 °C, the sample is completely vaporized and undergoes oxidative cracking, and the nitrogen compounds therein are quantitatively converted into nitric oxide (NO). The sample gas passes through a membrane dryer to remove the moisture therein. The metastable nitric oxide reacts with the O3 gas from the ozone generator in the reaction chamber to be converted into excited NO2*. When the excited NO2* transitions to the ground state, photons are emitted. The optical signal is detected and received by a photomultiplier tube at a specific wavelength, and then amplified by a micro-current amplifier and processed by a computer data processor, and then converted into an electrical signal proportional to the light intensity. Under certain conditions, the chemiluminescence intensity in the reaction is proportional to the amount of nitric oxide generated, and the amount of nitric oxide is proportional to the total nitrogen content in the sample. Therefore, the total nitrogen content in the sample can be determined by measuring the chemiluminescence intensity.

[0003] Since when the chemiluminescence nitrogen equipment samples, after the sample undergoes high-temperature cracking in the quartz tube of the cracking furnace, black impurities and gas samples will appear. The black impurities and gas samples will pass through the membrane dryer together to remove moisture, resulting in accelerated pollution and damage of the membrane dryer, causing huge economic losses. Therefore, technical improvements are made to the chemiluminescence nitrogen analyzer. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pre-purification system for a detection instrument to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pre-purification system for a detection instrument includes an automatic sampler, a cracking furnace and a membrane dryer. The automatic sampler is arranged on the top of the cracking furnace. The sample in the cracking furnace is vaporized and enters the purifier through a sample delivery pipe. The purifier is connected to the membrane dryer through a gas sample pipe and is sent to the reaction chamber after drying.

[0007] As a further scheme of the utility model: the purifier includes a purification chamber, a distributor and a purification liquid. The output end of the sample delivery pipe is provided with a distributor located in the purification chamber and used for distributing the gas sample, and the gas sample is evenly distributed in the purification liquid stored in the purification chamber.

[0008] As a further solution of the utility model: The distributor includes an opening tube and a distribution tube. The opening tube is installed at the output end of the sample feeding tube. The bottom of the opening tube is set as an opening, and the outside of the opening tube is communicated with the distribution tube.

[0009] As a further solution of the utility model: The purification liquid is anaerobic water. The purification liquid is supplemented to three places in the purification chamber at four minutes, and the top is gas.

[0010] As a further solution of the utility model: A filter screen capable of cutting the floating gas sample is arranged inside the purification liquid, and the filter screen is located above the opening tube.

[0011] As a further solution of the utility model: The bottom of the purification chamber is connected with a sewage discharge pipeline, and the top of the purification chamber is connected with a water inlet pipeline. Control valves are arranged on both the sewage discharge pipeline and the water inlet pipeline.

[0012] As a further solution of the utility model: The reaction chamber is communicated with an optical signal processor, and the optical signal processor is configured with a computer mainframe and a microcomputer display.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The detection instrument is pre-equipped with a purification system. A purifier is added between the cracking furnace and the mode dryer. After the black carbon, impurities, and gas samples pass through the purifier, most of the black carbon and impurities can be filtered, the service life of the mode dryer can be extended, the mode dryer, reaction, and optical signal processing equipment can be effectively protected, the damage probability and frequency can be reduced, and the maintenance cost can be lowered. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a pre-purification system for a detection instrument.

[0016] In the figure: 1. Automatic sampler; 2. Cracking furnace; 3. Mode dryer; 4. Reaction chamber; 5. Optical signal processor; 6. Microcomputer display; 7. Computer mainframe; 8. Purification chamber; 9. Purification liquid; 10. Sample feeding tube; 11. Opening tube; 12. Distribution tube; 13. Filter screen; 14. Sewage discharge pipeline; 15. Control valve; 16. Water inlet pipeline; 17. Gas sample tube. Detailed Embodiments

[0017] Please refer to Figure 1, in the embodiment of the present utility model, a pre-purification system for a detection instrument includes an automatic sampler 1, a cracking furnace 2, and a mode dryer 3. The automatic sampler 1 is arranged on the top of the cracking furnace 2. The sample vaporizes in the cracking furnace 2 and enters the purifier through the sample delivery pipe 10. The purifier is connected to the mode dryer 3 through the gas sample pipe 17, and after drying, it is sent into the reaction chamber 4. A purifier is added between the cracking furnace 2 and the mode dryer 3. After the black carbon, impurities, and gas sample pass through the purifier, most of the black carbon and impurities can be filtered, extending the service life of the mode dryer 3, effectively protecting the mode dryer 3, reaction, and optical signal processing equipment, reducing the probability and frequency of their damage, and reducing the maintenance cost.

[0018] In a preferred embodiment, the purifier includes a purification chamber 8, a distributor, and a purification liquid 9. The output end of the sample delivery pipe 10 is provided with a distributor located in the purification chamber 8 and used for distributing the gas sample, distributing the gas sample evenly in the purification liquid 9 stored in the purification chamber 8. The black carbon, impurities, and gas sample enter the purification liquid 9 together through the sample delivery pipe 10. The black carbon and impurities are adsorbed into the purification liquid 9, and the gas sample floats to the top from the purification liquid 9 and is sent into the mode dryer 3, reducing the impurities entering the mode dryer 3 and the reaction chamber 4.

[0019] In a preferred embodiment, the distributor includes an open pipe 11 and a distribution pipe 12. The open pipe 11 is installed at the output end of the sample delivery pipe 10. The bottom of the open pipe 11 is set to be open, and the outside of the open pipe 11 is communicated with the distribution pipe 12. The sample delivery pipe 10 is distributed into the purification liquid 9 through the distribution pipe 12 from the open pipe 11. The black carbon and impurities are discharged through the bottom opening of the open pipe 11, achieving the effect of gas distribution of the gas sample.

[0020] In a preferred embodiment, the purification liquid 9 is anaerobic water. The purification liquid 9 is replenished to three quarters of the purification chamber 8, and the top is gas. Nitric oxide is hardly soluble in water at high temperatures. Nitric oxide (NO) is a colorless and odorless gas, but it is easily reacted with oxygen to form nitrogen dioxide (NO2). Therefore, to avoid its reaction with the oxygen in the water, anaerobic water is used as the purification liquid 9, and ozone or other gases are used for the top gas to avoid the entry of oxygen.

[0021] In a preferred embodiment, a filter screen 13 capable of cutting the floating gas sample is arranged inside the purification liquid 9. The filter screen 13 is located above the open pipe 11. The bottom of the purification chamber 8 is connected to a sewage pipeline 14, and the top of the purification chamber 8 is connected to a water inlet pipeline 16. Control valves 15 are arranged on both the sewage pipeline 14 and the water inlet pipeline 16. During the gas flotation process, the bubbles are cut by the filter screen 13, making the bubbles smaller, and the impurities are more easily dissolved in water. At the same time, large particulate floating matter is prevented from floating to the liquid surface and is blocked at the bottom and sent out through the opening of the sewage pipeline 14. The water inlet pipeline 16 supplies and replaces the purification liquid 9 to the purification chamber 8.

[0022] In a preferred embodiment, the reaction chamber 4 is connected to the optical signal processor 5. The optical signal processor 5 is configured with a computer mainframe 7 and a microcomputer monitor 6. The signal is received by a photomultiplier tube and amplified by a micro-current amplifier, and can be converted into an electrical signal proportional to the light emission intensity. Under certain conditions, the light emission intensity is proportional to the amount of NO, and the generated amount of NO is proportional to the total N content in the sample. Therefore, the chemiluminescence intensity can be measured through the electrical signal, and then the N content in the sample can be measured. Finally, the optical signal processor transmits the final nitrogen measurement value to the computer mainframe, and a curve graph is formed on the microcomputer display screen. The final nitrogen measurement value is determined through the calculation of the software.

[0023] It should be noted that the above embodiments all belong to the same inventive concept of the utility model. The descriptions of the embodiments have their own focuses. For the parts not described in detail in individual embodiments, reference can be made to the descriptions in other embodiments.

[0024] The above-described embodiments only represent the implementation modes of the utility model. The descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A detection instrument pre-purification system, comprising an automatic sampler (1), a cracking furnace (2) and a pattern dryer (3), wherein the automatic sampler (1) is arranged on the top of the cracking furnace (2), and is characterized in that: The sample in the cracking furnace (2) is vaporized and enters the purifier through the sample delivery tube (10). The purifier is connected to the model dryer (3) through the gas sample tube (17) and is delivered to the reaction chamber (4) after being dried.

2. A detection instrument pre-purification system according to claim 1, characterized in that: The purifier comprises a purification chamber (8), a distributor and a purification liquid (9), and the output end of the sample delivery tube (10) is provided with a distributor located in the purification chamber (8) and used for distributing the gas sample, so that the gas sample is evenly distributed in the purification liquid (9) stored in the purification chamber (8).

3. A detection instrument pre-purification system according to claim 2, characterized in that: The distributor comprises an open tube (11) and a distribution tube (12); the open tube (11) is installed at the output end of the sample delivery tube (10); the bottom of the open tube (11) is arranged to be open; the outside of the open tube (11) is connected to the distribution tube (12).

4. A detection instrument pre-purification system according to claim 2, characterized in that: The purification liquid (9) is oxygen-free water. The purification liquid (9) is added to the purification chamber (8) at three points of four minutes, and the top is gas.

5. A detection instrument pre-purification system according to claim 3, characterized in that: A filter screen (13) capable of cutting the floating gas sample is arranged inside the purification liquid (9), and the filter screen (13) is located above the open tube (11).

6. A detection instrument pre-purification system according to claim 2, characterized in that: The bottom of the purification chamber (8) is connected to a sewage pipeline (14), and the top of the purification chamber (8) is connected to a water inlet pipeline (16). Both the sewage pipeline (14) and the water inlet pipeline (16) are provided with control valves (15).

7. A detection instrument pre-purification system according to any one of claims 1 to 6, characterized in that: The reaction chamber (4) is connected to an optical signal processor (5), and the optical signal processor (5) is equipped with a computer host (7) and a microcomputer display (6).

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