CN110044676B - Sample gas pretreatment system and method for acrylonitrile device oxygen analyzer - Google Patents
Sample gas pretreatment system and method for acrylonitrile device oxygen analyzer Download PDFInfo
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- CN110044676B CN110044676B CN201910334961.9A CN201910334961A CN110044676B CN 110044676 B CN110044676 B CN 110044676B CN 201910334961 A CN201910334961 A CN 201910334961A CN 110044676 B CN110044676 B CN 110044676B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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Abstract
The invention discloses a sample gas pretreatment system for an acrylonitrile device oxygen analyzer, and also discloses a sample gas pretreatment method for the acrylonitrile device oxygen analyzer, which comprises 9 steps. The processing method can effectively reduce the failure rate of the oxygen analyzer and reduce the number of times of parking in production; the compressed air is adopted to drive the refrigerator in the pretreatment process, the desalted and purified water used for washing is used to drive the drainage device, the green process is clear, the principle is simple, the production operation process is simple and convenient, and the method is suitable for large-scale industrial production and application, and is widely suitable for acrylonitrile production and processing and related industries.
Description
Technical Field
The invention relates to the technical field of sample pretreatment, in particular to a sample gas pretreatment system and method for an acrylonitrile device oxygen analyzer.
Background
The production methods of acrylonitrile mainly include a cyanoethanol method, an acetylene method and a propylene ammoxidation method, wherein the propylene ammoxidation method is widely used in industrial production because of high acrylonitrile productivity and low cost.
The main reaction of the propylene ammoxidation method is CH3-CH 2+ NH3+1.5O2 → CH 2-CH-C.ident.N +3H2O, and industrial production of acrylonitrile is a continuous production process, which is different from laboratory reaction and pilot plant production, and the reaction is continuously shifted to a reaction promotion process by the reaction dynamic equilibrium principle.
According to the dynamic balance principle, because the content of oxygen is higher than the oxygen volume according to the ratio needs, therefore, the rate of whole reaction can receive the influence of oxygen content, namely, the oxygen content is high, whole reaction rate accelerates, the oxygen content is low, whole reaction rate descends, therefore, need strictly monitor oxygen content in the industrial production process, consequently, the feed inlet department of reation kettle can set up the oxygen analysis appearance in the industrial production process, the main objective is the input rate of monitoring oxygen and the content of pure oxygen, because the oxygen analysis appearance belongs to the precision instrument, very easy damage, consequently, the oxygen analysis appearance can be disturbed by the impurity gas that gets into at the gas inlet department, in the long run, the oxygen analysis appearance can be blockked up by the impurity gas that gets into and even damage.
And the oxygen analysis appearance that damages at first can cause detection error, and secondly, it needs the production to park to change the oxygen analysis appearance, influences the production efficiency of enterprise, and finally, frequently change the production input that the oxygen analysis appearance can increase the enterprise.
Disclosure of Invention
The invention provides a sample gas pretreatment system and method for an acrylonitrile device oxygen analyzer, which aim to solve the problem that the sample gas in the oxygen analyzer in the prior art contains more background gas.
In order to solve the technical problems, the invention discloses the following technical scheme:
the utility model provides a be used for acrylonitrile unit oxygen analysis appearance sample gas pretreatment systems, including the process line, the sampling probe, instrument wind decompression filter, the desalinized water filter, the drainage ware, the surge tank, vapour and liquid separator, cyclone, the condensation filter, the oxygen analysis appearance, the connecting line, the instrument, valve and flowmeter, the process line, the sampling probe, instrument wind decompression filter, the desalinized water filter, the drainage ware, the surge tank, vapour and liquid separator, the vortex refrigeration pipe, cyclone, connect through the connecting line between condensation filter and the oxygen analysis appearance, set up vortex refrigeration pipe cyclone in the cyclone and adopt vortex refrigeration pipe as the refrigeration main part.
The drainage device comprises a drainage device body, a flow guide pipe, an injection pipe, a flange, a support A, a sealing ring and a screw, wherein the drainage device body is of a circular ring structure, the flow guide pipe is inserted into an inner cavity of the drainage device body, the injection pipe is arranged on the flow guide pipe, the flange is arranged on the injection pipe, a plurality of sealing rings are arranged between the injection pipe and the flange, the support A is arranged on the flange, a plurality of through holes are formed in the support A, the through holes are circular, and the screw penetrates through the through holes of the support A and is connected with the flange.
The drive of drainage ware desalination, the pressure level of desalination water 0.7.Mpa, connecting line between drainage ware and the desalination water governing valve are the drainage tube, are the open mode when the desalination water governing valve, and the desalination water is fast in the drainage tube for drainage ware entrance forms the backpressure, and there is great pressure differential promptly pressure in the drainage ware and external atmospheric pressure, can inhale the drainage ware with the feed gas, and the air water mixture in the drainage ware is through pressure extrusion, can spout the drainage ware.
The surge tank includes main jar and surge tank, main jar includes surge tank entry, surge tank export, condensate port and maintains the mouth, the surge tank includes gaseous phase balance mouth, overflow leakage fluid-discharge outlet, main jar includes inner room and outer room, separate through the baffle between inner room and the outer room, baffle upper end links to each other with main jar upper wall is fixed, baffle length is less than main jar height, promptly, the inner room and the outer room bottom intercommunication of main jar, set up the overflow mouth on the main jar lateral wall, the overflow mouth will be main jar and balance jar intercommunication each other, the balance jar upper end sets up gaseous phase balance mouth, the balance jar lower extreme sets up the overflow leakage fluid-discharge outlet, the overflow leakage fluid-discharge outlet is U type structure.
The gas-liquid separator comprises an inlet, an outlet and a liquid outlet, an inlet pipe is arranged in the inlet, the inlet pipe extends into the bottom of the gas-liquid separator, and the outlet is protruded on the upper surface of the gas-liquid separator to separate a gas-liquid mixture by means of liquid gravity and gas pressure. The liquid is collected into the outer chamber of the surge tank through a liquid discharge pipe.
Set up vortex refrigeration pipe in the cyclone, vortex refrigeration pipe includes cold wind exhaust cap, O type circle, vortex room subassembly, instrument air inlet and hot-air discharge valve, instrument air inlet upper end and vortex room subassembly are connected, instrument air inlet lower extreme and hot-air discharge valve fixed connection, be connected through O type circle between instrument air inlet and the hot-air discharge valve, vortex room subassembly upper end sets up the cold wind exhaust cap, pass through O type circle transitional coupling between cold wind exhaust cap and the vortex room subassembly.
After the compressed air is injected into the vortex cooling tube, the airflow rotates at the speed of one million revolutions per minute to flow to the outlet at the right side of the hot gas end of the vortex tube, a part of the airflow flows out through the control valve, and after the rest of the airflow is blocked, the inner ring of the original airflow reversely rotates at the same rotating speed and flows to the left side of the cold gas end of the vortex tube.
The power source of the invention is from the pressure difference between the connecting pipelines, the pressure difference inside and outside the connecting pipelines and the pressure difference between the connecting pipelines and each equipment part, and the continuous pretreatment process can be ensured after the sample gas is continuously input.
A sample gas pretreatment method for an acrylonitrile device oxygen analyzer comprises the following steps:
And 5, secondary dehydration: carrying out gas-liquid separation on the sample gas A in the step 4 to form a sample gas B;
and 7, multi-stage filtration: performing multi-stage filtration on the primary sample gas product obtained in the step 6, and filtering fine particles in the primary sample gas product to form a finished sample gas product;
and 9, post-processing: and (4) collecting the sample gas escaped from the bypass and the finished product of the sample gas analyzed by the oxygen analyzer in the step (8) to be completely combusted to form harmless substances.
The negative pressure environment is formed at the inlet of the drainage device, the pressure of desalted water is 0.7Mpa, the desalted water flows at a high speed in the drainage tube, back pressure is formed at the inlet of the sample, and the sample gas enters the sampling pipeline after being sucked into the drainage device by the negative pressure.
And after entering the drainage tube, the sample gas and high-pressure desalted water form a mist gas-water mixture. And the atomized gas-water mixture is subjected to high-pressure injection through a drainage pipeline of the drainage device, and the atomized gas-water mixture after injection enters a pressure stabilizing tank to be subjected to pressure stabilizing separation to obtain sample gas and liquid water.
And the separated sample gas passes through a secondary gas-liquid separation tank, and secondary separation is carried out on the gas-liquid mixture by means of liquid gravity and gas pressure. The liquid water converges to the outer chamber of the pressure stabilizing tank, and the purpose of secondary pressure stabilization is achieved.
And the sample gas after secondary separation and pressure stabilization is subjected to cyclone refrigeration to form condensate which is discharged into an outer chamber of the pressure stabilization tank, and water molecules attached to the sample gas are removed again. The refrigerated sample gas is restored to the temperature value close to the temperature value before refrigeration under the action of the steam tracing pipe. The pure sample gas is filtered in the first stage and the second stage to form the final analysis sample gas, and the final analysis sample gas enters an analysis instrument for sample analysis.
The sample gas and the tail gas at the outlet of the oxygen analyzer which are bypassed are converged into the catalytic combustor, and can be completely converted into harmless substances through the combustion of the catalytic combustor, and meanwhile, the constant emptying back pressure value close to the atmospheric pressure is ensured.
Including but not limited to a pressure gauge.
The valves include, but are not limited to, meter air valves, desalted water regulating valves, bypass valves, sample valves, maintenance valves, zero air conditioning valves, and span air conditioning valves.
The connecting pipeline includes but is not limited to a connecting pipe, a sampling pipeline, a steam tracing pipe and a sewage discharge pipe.
The flow meters include, but are not limited to, desalted water flow meters, bypass flow meters, and sample injection flow meters.
The background gas includes but is not limited to AN, ACN, HCN, H2O、CO、CO2、C3H6、N2。
According to the technical scheme, the invention has the following advantages:
1. according to the invention, the polymer in the sample gas is fully dissolved by the desalted water, and most of interference components in the background gas are filtered and separated, so that the fault rate of the oxygen analyzer is effectively reduced, and the maintenance and replacement cost of enterprise equipment is reduced.
2. The invention adopts compressed air to drive the refrigerator and adopts desalted and purified water for washing to drive the drainage device, thereby saving energy, protecting environment and realizing a green process.
3. The invention adopts cyclone refrigeration to ensure the sampling to be anhydrous, adopts steam heat tracing to ensure the sampling temperature to be constant, and adopts secondary pressure stabilizing separation to ensure the pressure of the sample to be constant. The sustainability of the whole sampling process is ensured.
4. The tail gas is converted into pollution-free carbohydrate through catalytic combustion and is discharged into the atmosphere, so that the environment-friendly discharge requirement is ensured, and the problem that the measured value is influenced by the high emptying backpressure value caused by the traditional discharge pipe is solved.
Drawings
FIG. 1 is an overall flow chart of the present invention.
FIG. 2 is a schematic view of the structure of the flow diverter of the present invention.
Fig. 3 is a schematic diagram of a surge tank structure and a supporting system in the invention.
FIG. 4 is a schematic view of the structure of the gas-liquid separator of the present invention.
Fig. 5 is a schematic view of the cyclone refrigerator of the present invention.
Fig. 6 is a schematic view of a vortex refrigerating pipe structure of the cyclone refrigerator of the present invention.
Wherein: 1. sampling a probe; 2. an instrument wind pressure reduction filter; 3. a desalted water filter; 4. a drainage device; 5. a surge tank; 6. a gas-liquid separator; 7. a vortex cooling tube; 8. a cyclone refrigerator; 9. a coalescing filter; 10. an oxygen analyzer;
41. a drainage device body; 42. a flow guide pipe; 43. an injection pipe; 44. a flange; 45. a bracket A; 46. a seal ring; 47. a screw;
51. a surge tank inlet; 52. an outlet of the surge tank; 53. a condensate port; 54. a gas phase balancing port; 55. an overflow drain port; 56. maintaining the mouth;
61. an inlet; 62. an outlet; 63. a liquid discharge port;
71. a cold air exhaust cap; 72. an O-shaped ring; 73. a scroll chamber assembly; 74. an instrument air inlet; 75. a hot air exhaust valve;
81. filling the core with a thermometer; 82. an upper cover; 83. a lower cover; 84. and (B) a bracket.
Detailed Description
The utility model provides a be used for acrylonitrile unit oxygen analysis appearance sample gas pretreatment systems, including sampling probe 1, instrument wind pressure reduction filter 2, demineralized water filter 3, drainage ware 4, surge tank 5, vapour and liquid separator 6, cyclone 8, condensation filter 9, oxygen analysis appearance 10, connecting line, the instrument, valve and flowmeter, the process line, sampling probe 1, instrument wind pressure reduction filter 2, demineralized water filter 3, drainage ware 4, surge tank 5, vapour and liquid separator 6, cyclone 8, connect through the connecting line between condensation filter 9 and the oxygen analysis appearance 10, set up vortex refrigeration pipe 7 in the cyclone 8, cyclone 8 adopts vortex refrigeration pipe 7 as the refrigeration main part.
As shown in fig. 1, the meter includes, but is not limited to, a pressure gauge. The valves include, but are not limited to, meter air valves, desalted water regulating valves, bypass valves, sample valves, maintenance valves, zero air conditioning valves, and span air conditioning valves. The connecting pipeline includes but is not limited to a connecting pipe, a sampling pipeline, a steam tracing pipe and a sewage discharge pipe. The flow meters include, but are not limited to, desalted water flow meters, bypass flow meters, and sample injection flow meters. The background gases include, but are not limited to, AN, ACN, HCN, H2O, CO2, C3H6, N2.
As shown in fig. 2, the flow diverter 4 comprises a flow diverter body 41, a flow guide tube 42, an injection tube 43, a flange 44, a bracket a45, a sealing ring 46 and a screw 47, wherein the flow diverter body 41 is of a circular ring structure, the flow guide tube 42 is inserted into an inner cavity of the flow diverter body 41, the injection tube 43 is arranged on the flow guide tube 42, the flange 44 is arranged on the injection tube 43, a plurality of sealing rings 46 are arranged between the injection tube 43 and the flange 44, the bracket a45 is arranged on the flange 44, a plurality of through holes are arranged on the bracket a45, the through holes are circular, and the screw 47 penetrates through the through hole of the bracket a45 and is connected with the flange 44.
4 desalted water drive of drainage device, the pressure level of desalted water 0.7Mpa, connecting line between drainage device 4 and the desalted water governing valve is the drainage tube, is the open mode when the desalted water governing valve, and desalted water is fast in the drainage tube, and speed is up to one million rotations per minute for 4 entry 61 departments of drainage device form the backpressure, and there is great pressure differential promptly pressure with external atmospheric pressure in the drainage device 4, can squeeze into drainage device 4 with the feeding gas, and the air water mixture in drainage device 4 is through pressure extrusion, can spout drainage device 4, consequently, drainage device 4 need not set up the power supply, can effectively practice thrift the energy consumption.
As shown in fig. 3, the surge tank 5 includes a main tank and a balance tank, the main tank includes a surge tank inlet 51, a surge tank outlet 52, a condensate outlet 53 and a maintenance port 56, the balance tank includes a gas phase balance port 54 and an overflow drain 55, the main tank includes an inner chamber and an outer chamber, the inner chamber and the outer chamber are separated by a partition plate, the upper end of the partition plate is fixedly connected with the upper wall of the main tank, the length of the partition plate is smaller than the height of the main tank, that is, the inner chamber and the bottom end of the outer chamber of the main tank are communicated, an overflow port is arranged on the side wall of the main tank, the overflow port connects the main tank and the balance tank, the gas phase balance port 54 is arranged on the upper end of the balance tank, the overflow drain 55 is arranged on the lower end of the balance tank, and the overflow drain 55 is U-shaped. The pressure of the upper part of the outer chamber is ensured to be constant at atmospheric pressure. The other liquid discharge pipes are inserted below the liquid level of the outer chamber to form a water seal effect on the liquid discharge pipes, and the up-and-down floating of the liquid level in the tank body generates a pressure stabilizing effect on the upper layer gas of the inner chamber.
As shown in fig. 4, the gas-liquid separator 6 includes an inlet 61, an outlet 62, and a liquid outlet 63, wherein an inlet 61 pipe is disposed in the inlet 61, the inlet 61 pipe extends into the bottom of the gas-liquid separator 6, and the outlet 62 protrudes from the upper surface of the gas-liquid separator 6, so as to separate the gas-liquid mixture by means of liquid gravity and gas pressure. The liquid is collected into the outer chamber of the pressure stabilizing tank 5 through a liquid discharge pipe, and the secondary pressure stabilizing effect is ensured.
As shown in fig. 5 and 6, a vortex cooling pipe 7 is arranged in the cyclone cooler 8, the vortex cooling pipe 7 includes a cold air exhaust cap 71, an O-ring 72, a vortex chamber assembly 73, an instrument air inlet 74 and a hot air exhaust valve 75, the upper end of the instrument air inlet 74 is connected with the vortex chamber assembly 73, the lower end of the instrument air inlet 74 is fixedly connected with the hot air exhaust valve 75, the instrument air inlet 74 is connected with the hot air exhaust valve 75 through the O-ring 72, the upper end of the vortex chamber assembly 73 is provided with the cold air exhaust cap 71, and the cold air exhaust cap 71 is in transitional connection with the vortex chamber assembly 73 through the O-ring 72.
After the compressed air is injected into the vortex cooling tube 7, the airflow rotates at the speed of one million revolutions per minute to flow to the outlet at the right side of the hot gas end of the vortex tube, a part of the airflow flows out through the control valve, and after the rest of the airflow is blocked, the inner ring of the original airflow reversely rotates at the same rotating speed and flows to the left side of the cold gas end of the vortex tube. In the process, the two air flows exchange heat, the inner air flow becomes very cold and flows out from the left side, and the outer air flow becomes very hot and flows out from the right side. The temperature and the flow of the cold air flow can be controlled by adjusting a valve at the hot gas end of the vortex tube. The higher the gas outlet ratio of the hot gas end of the vortex tube is, the lower the temperature of the airflow at the cold gas end of the vortex tube is, and the flow rate is correspondingly reduced.
Because of pressure drive, the whole process does not need power drive, only need to let in compressed gas can. Can work in high temperature environment. The interior of the device does not contain chemical substances such as refrigerant and the like, and components do not have any friction, so that the device can be widely used for sample pretreatment. Cold air sprayed out of the cold end of the vortex refrigeration pipe 7 is directly sprayed to a sample pipeline needing refrigeration through the cyclone refrigerator 8 to refrigerate the sample quickly, and the thermometer is arranged at the tail end of the cyclone refrigerator 8 and can visually monitor the refrigeration effect.
A sample gas pretreatment method for an acrylonitrile device oxygen analyzer comprises the following steps:
And 5, secondary dehydration: carrying out gas-liquid separation on the sample gas A in the step 4 to form a sample gas B; and the separated sample gas passes through a secondary gas-liquid separation tank, and secondary separation is carried out on the gas-liquid mixture by means of liquid gravity and gas pressure. The liquid water converges to the outside of the pressure stabilizing tank 5, and the purpose of secondary pressure stabilization is achieved.
And 7, multi-stage filtration: performing multi-stage filtration on the primary sample gas product obtained in the step 6, and filtering fine particles in the primary sample gas product to form a finished sample gas product; the purer sample gas is filtered by the first-stage and second-stage to form the final analysis sample gas, and the sample gas after being washed by water passes through the filter, so that the risk of filter blockage is greatly reduced.
and 9, post-processing: and (4) collecting the sample gas escaped from the bypass and the finished product of the sample gas analyzed by the oxygen analyzer 10 in the step (8) to be completely combusted to form harmless substances. The bypassed sample gas and tail gas at the outlet of the oxygen analyzer 10 are merged into the catalytic combustor, and can be completely converted into harmless substances through combustion of the catalytic combustor, and meanwhile, the constant emptying back pressure value close to the atmospheric pressure is ensured.
Claims (6)
1. The utility model provides a be used for gaseous pretreatment systems of acrylonitrile device oxygen analysis appearance sample, includes process line, sampling probe (1), instrument wind decompression filter (2), desalted water filter (3), drainage ware (4), surge tank (5), vapour and liquid separator (6), cyclone (8), condensation filter (9), oxygen analysis appearance (10), connecting line, instrument, valve and flowmeter, its characterized in that: the process pipeline, the sampling probe (1), the instrument wind pressure reduction filter (2), the desalted water filter (3), the flow diverter (4), the pressure stabilizing tank (5), the gas-liquid separator (6), the cyclone refrigerator (8), the condensation filter (9) and the oxygen analyzer (10) are connected through a connecting pipeline, and a vortex refrigeration pipe (7) is arranged in the cyclone refrigerator (8); the flow diverter (4) comprises a flow diverter main body (41), a flow guiding pipe (42), an injection pipe (43), a flange (44), a support A (45), a sealing ring (46) and a screw (47), wherein the flow diverter main body (41) is of a circular ring structure, the flow guiding pipe (42) is inserted into an inner cavity of the flow diverter main body (41), the injection pipe (43) is arranged on the flow guiding pipe (42), the flange (44) is arranged on the injection pipe (43), a plurality of sealing rings (46) are arranged between the injection pipe (43) and the flange (44), the support A (45) is arranged on the flange (44), a plurality of through holes are formed in the support A (45), the through holes are circular, and the screw (47) penetrates through holes of the support A (45) and is connected with the flange (44);
the pressure stabilizing tank (5) comprises a main tank and a balance tank, the main tank comprises a pressure stabilizing tank inlet (51), a pressure stabilizing tank outlet (52), a condensate port (53) and a maintenance port (56), the balance tank comprises a gas phase balance port (54) and an overflow liquid discharge port (55), the main tank comprises an inner chamber and an outer chamber, the inner chamber and the outer chamber are separated by a partition plate, the upper end of the partition plate is fixedly connected with the upper wall of the main tank, the length of the partition plate is smaller than the height of the main tank, the side wall of the main tank is provided with an overflow port, the main tank and the balance tank are mutually communicated by the overflow port, the gas phase balance port (54) is arranged at the upper end of the balance tank, the overflow liquid discharge port (55) is arranged at the lower end of the balance tank, the overflow liquid discharge port (55) is of a U-shaped structure, the gas-liquid separator (6) comprises an inlet (61), an outlet (62) and a liquid discharge port (63), an inlet pipe is arranged in the inlet (61), the inlet pipe extends into the bottom of the gas-liquid separator (6), and the outlet (62) is protruded on the upper surface of the gas-liquid separator (6);
set up vortex refrigeration pipe (7) in cyclone (8), vortex refrigeration pipe (7) are including cold wind exhaust cap (71), O type circle (72), vortex room subassembly (73), instrument air inlet (74) and hot-air discharge valve (75), instrument air inlet (74) upper end is connected with vortex room subassembly (73), instrument air inlet (74) lower extreme and hot-air discharge valve (75) fixed connection, be connected through O type circle (72) between instrument air inlet (74) and hot-air discharge valve (75), vortex room subassembly (73) upper end sets up cold wind exhaust cap (71), pass through O type circle (72) transitional coupling between cold wind exhaust cap (71) and the vortex room subassembly (73).
2. The system of claim 1 for pretreating sample gas for an acrylonitrile plant oxygen analyzer, wherein: the meter includes a pressure gauge.
3. The system of claim 1 for pretreating sample gas for an acrylonitrile plant oxygen analyzer, wherein: the valve comprises an instrument air valve, a desalted water regulating valve, a bypass valve, a sampling valve, a maintenance valve, a zero air regulating valve and a range air regulating valve.
4. The system of claim 1 for pretreating sample gas for an acrylonitrile plant oxygen analyzer, wherein: the connecting pipeline comprises a connecting pipe, a sampling pipeline, a steam heat tracing pipe and a sewage discharge pipe.
5. The system of claim 1 for pretreating sample gas for an acrylonitrile plant oxygen analyzer, wherein: the system and method for pretreating sample gas of an acrylonitrile plant oxygen analyzer according to claim 1, wherein the system comprises: the flowmeter comprises a desalted water flowmeter, a bypass flowmeter and a sample injection flowmeter.
6. A sample gas pretreatment method for the acrylonitrile plant oxygen analyzer of claim 1, characterized in that: the method comprises the following steps:
step 1, sampling: taking out the analysis sample gas from the process pipeline through a sampling probe (1);
step 2, high-pressure drainage: the desalted water flows at a high speed in the drainage tube, and back pressure is formed at the sample inlet to drive the sample gas to enter the drainage device (4);
step 3, mixing: the analysis sample gas and the desalted water are mixed in the flow diverter (4) to form a gas-water mixture, and a mist gas-water mixture is formed in the injection pipe;
step 4, pressure stabilization separation: spraying the mist gas-water mixture in the step 3 through a nozzle of a flow diverter (4) to enter a pressure stabilizing tank (5), and performing primary separation on the mist gas-water mixture to form a sample gas A;
and 5, secondary dehydration: carrying out gas-liquid separation on the sample gas A in the step 4 to form a sample gas B;
step 6, condensation and dehydration: condensing the sample gas B in the step 5, and removing condensate to form a sample gas primary finished product;
and 7, multi-stage filtration: performing multi-stage filtration on the primary sample gas product obtained in the step 6, and filtering fine particles in the primary sample gas product to form a finished sample gas product;
step 8, sample injection analysis: conveying the finished product of the sample gas in the step 7 to an oxygen analyzer (10) for analysis;
and 9, post-processing: and (4) collecting the sample gas escaped from the bypass and the finished product of the sample gas analyzed by the oxygen analyzer (10) in the step (8) to be completely combusted to form harmless substances.
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