A reverse-purge anti-clogging ICP atomization system

Abstract

This utility model discloses a reverse-purge anti-clogging ICP nebulization system, belonging to the field of atomic spectroscopy analysis technology. It includes an nebulizer (1), an electric shut-off valve (2), a nozzle (3), a computer (4), a time relay (5), a power supply (6), a first sample inlet tube (7), a second sample inlet tube (8), a first wire (9), a second wire (10), a third wire (11), a fourth wire (12), and a signal line (13). The nebulizer (1), the electric shut-off valve (2), and the nozzle (3) are connected via sample inlet tubes, and the remaining parts are connected via wires or signal lines. The beneficial effects of this utility model are: reverse purging operation can be achieved using simpler electrical signals, i.e., the electric shut-off valve (2) is controlled by the time relay (5) to cyclically open and close, which can effectively prevent clogging of the nebulizer (1) and will not continuously and completely cut off the sample inlet path to avoid ICP flameout, ensuring the safe and stable operation of the instrument.

Description

Technical Field

[0001] This utility model relates to an ICP atomization system with reverse purging and anti-clogging properties, belonging to the field of atomic spectroscopy analysis technology. Background Technology

[0002] Waste lubricating oil contains a significant amount of organosilicon compound impurities. These impurities can cause abnormal oil viscosity and reduced oxidation resistance, severely impacting lubrication performance. Furthermore, in the waste lubricating oil regeneration process, these impurities irreversibly adsorb onto the surface of the hydrorefining catalyst, covering active sites and leading to catalyst deactivation and a substantial reduction in regeneration efficiency. Additionally, excessive impurities can form silica or silicates at high temperatures, depositing on the inner walls of pipes, reactors, and other equipment, causing scaling and blockages, and increasing maintenance costs. Therefore, desiliconization treatment is necessary concurrently with the hydrorefining of waste lubricating oil. Detecting the silicon content in the waste lubricating oil before and after desiliconization requires an ICP (Inductively Coupled Plasma) instrument.

[0003] Some waste lubricating oils contain fine particles that are difficult to separate. During ICP sampling and determination of silicon content, these particles easily accumulate inside the nebulizer, causing blockage and hindering the normal operation of the instrument. When the nebulizer is blocked, the usual procedure is to first extinguish the flame, remove the nebulizer, block the nozzle, use carrier gas to backflush out the particles, then reinstall the nebulizer and re-ignite before continuing the measurement. This process is cumbersome, and repeated ignition and extinguishing can affect the lifespan of the ICP torch and coil. Therefore, this invention develops a reverse-purge anti-clogging ICP nebulization system to solve this problem. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a simple, easy-to-operate, safe, and effective anti-clogging ICP atomization system.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A reverse-purge anti-clogging ICP nebulization system includes an nebulizer 1, an electric shut-off valve 2, a nozzle 3, a computer 4, a time relay 5, a power supply 6, a first sample inlet tube 7, a second sample inlet tube 8, a first wire 9, a second wire 10, a third wire 11, a fourth wire 12, and a signal line 13. The nebulizer 1 is provided with a liquid inlet 101 and a carrier gas inlet 102. Nebulizer 1 is connected to electric shut-off valve 2 via injection tube 7, and electric shut-off valve 2 is connected to nozzle 3 via injection tube 8. Power supply 6 is connected to time relay 5 via wire 9 and wire 10; time relay 5 is connected to electric shut-off valve 2 via wire 11 and wire 12; computer 4 is connected to time relay 5 via signal line 13.

[0006] Furthermore, the gas-liquid passage formed by the nebulizer 1, the first injection tube 7, the electric shut-off valve 2, the second injection tube 8, and the nozzle 3 is a horizontal straight passage.

[0007] Preferably, the rated operating voltage of the electric shut-off valve 2, the time relay 5, and the power supply 6 are all DC24V, and the timing range of the time relay 5 is 0.1~60s.

[0008] When using this utility model, first turn on the ICP instrument, and inject the waste lubricating oil through the liquid inlet 101. The carrier gas is introduced through the carrier gas inlet 102. When the ICP instrument is running normally and the nebulizer 1 is not blocked, the time relay 5 does not work, the electric shut-off valve 2 remains fully open, and the carrier gas blows the waste lubricating oil from the nebulizer 1 into the electric shut-off valve 2 through the first sample inlet 7, and then into the nozzle 3 through the second sample inlet 8, where the atomization process is completed.

[0009] When nebulizer 1 becomes clogged, power supply 6 supplies power to time relay 5 via wires 9 and 10. Computer 4 then sends a signal to time relay 5 via signal line 13. Time relay 5 then automatically opens and closes the electric shut-off valve 2 via wires 11 and 12, closing for 5 seconds and then opening for 5 seconds, repeating this cycle. When electric shut-off valve 2 is closed, the carrier gas cannot blow the waste lubricating oil into nozzle 3, so it can only blow it out in the reverse direction through inlet 101. This process blows out the particles accumulated in nebulizer 1, thus resolving the clog. When electric shut-off valve 2 reopens, normal sample injection can resume. The ICP instrument will automatically shut down after 10 seconds of no sample injection, but the 5-second cycle of opening and closing of electric shut-off valve 2 avoids this situation, ensuring the safe operation of the instrument while cleaning nebulizer 1 and normal atomization of waste lubricating oil.

[0010] The advantages of this invention are as follows: 1. The reverse purging operation is achieved entirely through electrical signals, which is simpler than manual unblocking; 2. By controlling the cyclic opening and closing of the electric shut-off valve 2 through the time relay 5, the particles accumulated inside the nebulizer 1 can be effectively purged out, and the sample inlet passage will not be completely cut off continuously, so as to avoid ICP flameout and ensure the safe and stable operation of the instrument. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model, wherein 1 is an nebulizer, 101 is a liquid inlet, 102 is a carrier gas inlet, 2 is an electric shut-off valve, 3 is a nozzle, 4 is a computer, 5 is a time relay, 6 is a power supply, 7 is a first sample inlet tube, 8 is a second sample inlet tube, 9 is a first wire, 10 is a second wire, 11 is a third wire, 12 is a fourth wire, and 13 is a signal line. Detailed Implementation

[0012] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0013] Reference Figure 1 This utility model discloses a reverse-purge anti-clogging ICP nebulization system, comprising an nebulizer 1, an electric shut-off valve 2, a nozzle 3, a computer 4, a time relay 5, a power supply 6, a first sample inlet tube 7, a second sample inlet tube 8, a first wire 9, a second wire 10, a third wire 11, a fourth wire 12, and a signal line 13. The nebulizer 1 has a liquid inlet 101 and a carrier gas inlet 102. The connection method of each component is as follows: the electric shut-off valve 2 is connected to the nebulizer 1 through the first sample inlet tube 7 and to the nozzle 3 through the second sample inlet tube 8; the time relay 5 is connected to the power supply 6 through the first wire 9 and the second wire 10, to the electric shut-off valve 2 through the third wire 11 and the fourth wire 12, and to the computer 4 through the signal line 13.

[0014] The operation mode of this utility model is as follows: Turn on the ICP instrument and inject waste lubricating oil through the inlet 101. Carrier gas is introduced through the carrier gas inlet 102. When the ICP instrument is running normally and the nebulizer 1 is not blocked, the time relay 5 does not work, the electric shut-off valve 2 remains fully open, and the carrier gas blows the waste lubricating oil from the nebulizer 1 into the electric shut-off valve 2 through the first injection tube 7, and then into the nozzle 3 through the second injection tube 8, where the atomization process is completed.

[0015] When nebulizer 1 becomes clogged, power supply 6 supplies power to time relay 5 via wires 9 and 10. Computer 4 then sends a signal to time relay 5 via signal line 13. Time relay 5 then automatically opens and closes the electric shut-off valve 2 via wires 11 and 12, closing for 5 seconds and then opening for 5 seconds, repeating this cycle. When electric shut-off valve 2 is closed, the carrier gas cannot blow the waste lubricating oil into nozzle 3, so it can only blow it out in the reverse direction through inlet 101. This process blows out the particles accumulated in nebulizer 1, thus resolving the clog. When electric shut-off valve 2 reopens, normal sample injection can resume. The ICP instrument will automatically shut down after 10 seconds of no sample injection, but the 5-second cycle of opening and closing of electric shut-off valve 2 avoids this situation, ensuring the safe operation of the instrument while cleaning nebulizer 1 and normal atomization of waste lubricating oil. Example

[0016] The silicon content of a waste lubricating oil sample from a factory in Tianmen was determined.

[0017] The ICP instrument was turned on, and the waste lubricating oil sample was injected through the inlet port 101. Three parallel measurements were performed. In the first two measurements, the nebulizer 1 was not blocked, the injection process was normal, the silicon peak was normal, and the measurement results showed good repeatability. However, in the third parallel measurement, a significant decrease in the injection rate was observed, indicating that the nebulizer 1 was blocked. The silicon peak intensity was significantly reduced, and the measurement result was significantly lower than the first two measurements.

[0018] At this point, a signal can be applied to the time relay 5 via the computer 4, utilizing the timing function of the time relay 5 to achieve automatic cyclic opening and closing of the electric shut-off valve 2 every 5 seconds. When the electric shut-off valve 2 is closed, the carrier gas entering through the carrier gas port 102 can blow the particles accumulated inside the atomizer 1 out through the liquid inlet port 101 in the reverse direction; when the electric shut-off valve 2 opens again, the waste lubricating oil can be normally injected through the liquid inlet port 101 and blown into the nozzle 3 by the carrier gas to achieve the atomization process. After the injection rate has obviously returned to normal, indicating that the atomizer 1 has been successfully cleared, the signal to the time relay 5 is stopped by the computer 4, and the electric shut-off valve 2 returns to the fully open state. Subsequently, the waste lubricating oil sample was measured in parallel for the fourth, fifth, and sixth times. The injection process was normal in all cases, and the peak intensity of silicon was comparable to that of the first and second measurements. This indicates that after solving the blockage of the atomizer 1, this invention can ensure the reproducibility of the results when repeatedly measuring the same sample, that is, it can efficiently and accurately complete the sample testing and analysis.

[0019] The test results of the above waste lubricating oil samples are shown in Table 1.

[0020] Table 1. Parallel determination results of waste lubricating oil samples

Claims

1. A reverse-purge anti-clogging ICP atomization system, characterized in that, Includes nebulizer (1), electric shut-off valve (2), nozzle (3), computer (4), time relay (5), power supply (6), No. 1 sample inlet tube (7), No. 2 sample inlet tube (8), No. 1 wire (9), No. 2 wire (10), No. 3 wire (11), No. 4 wire (12), signal line (13). The nebulizer (1) is equipped with liquid inlet (101) and carrier gas inlet (102). The nebulizer (1) is connected to the electric shut-off valve (2) through the first injection tube (7), and the electric shut-off valve (2) is connected to the nozzle (3) through the second injection tube (8). The power supply (6) is connected to the time relay (5) through wire 1 (9) and wire 2 (10), the time relay (5) is connected to the electric shut-off valve (2) through wire 3 (11) and wire 4 (12), and the computer (4) is connected to the time relay (5) through signal line (13).

2. The ICP atomization system with reverse purging and anti-clogging as described in claim 1, characterized in that, The gas-liquid passage consisting of the nebulizer (1), the first injection tube (7), the electric shut-off valve (2), the second injection tube (8), and the nozzle (3) is a horizontal straight passage.

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