Acetylene purification available chlorine on-line analysis adjusting system

Abstract

The utility model discloses an acetylene purification available chlorine on-line analysis adjusting system, which comprises a sodium hypochlorite preparation tank, a sodium hypochlorite dilution tank, a washing tower, an available chlorine on-line analyzer and a pH monitoring meter, a first Venturi reactor is arranged on the preparation tank, and an alkali liquor inlet, a chlorine inlet and a demineralized water inlet are arranged on the first Venturi reactor; a second venturi reactor is arranged on the dilution tank, and a concentrated sodium hypochlorite liquid inlet and a primary water inlet are formed in the second venturi reactor; the preparation tank is connected with a concentrated sodium hypochlorite liquid inlet formed in the dilution tank through a first delivery pump; the washing tower is provided with a circulating pump, an inlet pipeline of the circulating pump is connected with a washing tower kettle, and an outlet pipeline of the circulating pump is connected with the top of the washing tower; the diluting tank is connected with an inlet of the circulating pump through a second conveying pump; a communication pipeline is arranged between an outlet pipeline and an inlet pipeline of the circulating pump, an available chlorine online analyzer and a pH monitoring meter are arranged on the communication pipeline, and the analysis system can be automatically adjusted and is safe and stable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of online analysis, in particular to an acetylene purified effective chlorine online analysis and regulation system. Background Art

[0002] In the process of preparing vinyl acetate by the calcium carbide acetylene method, calcium carbide is used to prepare acetylene gas. Acetylene gas often contains impurity gases such as hydrogen sulfide and phosphine, which will irreversibly adsorb the catalyst used for vinyl acetate synthesis and destroy its activity, thereby causing catalyst poisoning and failure, affecting the vinyl acetate synthesis reaction. Acetylene gas needs to be purified. In the process of acetylene gas purification, most companies in the industry use traditional sodium hypochlorite purification technology, which uses the oxidizing property of sodium hypochlorite to remove impurities in acetylene gas by countercurrent contact between sodium hypochlorite solution and acetylene gas. When sodium hypochlorite is used to treat acetylene gas, its effective chlorine content needs to be controlled. When the effective chlorine is too high, chloroacetylene is easily produced, resulting in safety accidents; when the effective chlorine is too low, impurities in acetylene gas cannot be better removed, affecting the quality of subsequent products. Therefore, it is very important to sample and analyze the effective chlorine content in the system.

[0003] In the prior art, operators manually sample and analyze the content of effective chlorine at intervals, and adjust the process according to the sample analysis results. However, there is a time difference in the sampling and analysis to adjust the flow of chlorine and alkali solution, and the operation is frequent and time-consuming. The concentration of the prepared sodium hypochlorite is also unstable, causing the effective chlorine to fluctuate, affecting the purification effect of crude acetylene and causing incomplete purification of crude acetylene, thereby affecting the quality of subsequent synthetic vinyl acetate. Although there are available chlorine online analyzers on the market, the equipment design does not take into account the fact that the equipment cannot be started normally due to the freezing factor in the cold winter in the north, which affects the normal operation of the production process. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model proposes an online analysis and adjustment system for acetylene purified effective chlorine, which solves the problem that manual sampling and analysis is time-consuming and laborious, process adjustment is not timely, and effective chlorine fluctuations are easily caused. At the same time, a solution is proposed for the problem that the existing effective chlorine online analyzer is prone to freezing due to weather reasons, which affects the measurement and causes the production process to be unable to operate normally.

[0005] To achieve the purpose of the utility model, the acetylene purification effective chlorine online analysis and regulation system of the utility model comprises a sodium hypochlorite preparation tank, a sodium hypochlorite dilution tank, a washing tower, a pH monitor and an effective chlorine online analyzer, wherein the sodium hypochlorite preparation tank is provided with a first venturi reactor, and the first venturi reactor is provided with an alkali solution inlet, a chlorine gas inlet and a demineralized water inlet; the sodium hypochlorite dilution tank is provided with a second venturi reactor, and the second venturi reactor is provided with a concentrated sodium hypochlorite liquid inlet and a primary water inlet; the sodium hypochlorite preparation tank is connected to the concentrated sodium hypochlorite liquid inlet provided on the sodium hypochlorite dilution tank through a first delivery pump; the washing tower is provided with a circulating pump, the circulating pump inlet pipeline is connected to the washing tower kettle, and the circulating pump outlet pipeline is connected to the washing tower top; the sodium hypochlorite dilution tank is connected to the circulating pump inlet through a second delivery pump; a connecting pipeline is provided between the circulating pump outlet pipeline and the inlet pipeline, and an effective chlorine online analyzer and a pH monitor are provided on the connecting pipeline.

[0006] Furthermore, the inlet of the communicating pipeline is connected to the outlet pipeline of the circulation pump, and the outlet of the communicating pipeline is connected to the inlet of the circulation pump.

[0007] Furthermore, the connection point between the outlet of the communicating pipeline and the inlet of the circulating pump is 50-100 cm away from the inlet of the circulating pump.

[0008] Furthermore, the connection point between the inlet of the communicating pipeline and the outlet of the circulating pump is 50-100 cm away from the outlet of the circulating pump.

[0009] Furthermore, the connecting pipeline is provided with at least one check valve.

[0010] Furthermore, the connecting pipeline has an N-shaped structure, or the upper section of the connecting pipeline has an L-shaped structure and the lower section has an N-shaped structure.

[0011] Furthermore, the pH monitor is arranged at the inlet end of the connecting pipeline, and the available chlorine online analyzer is arranged at the outlet end of the connecting pipeline.

[0012] Furthermore, the available chlorine online analyzer is provided with a water inlet pipe, a sample suction pipe and a liquid discharge pipe, the water inlet pipe is connected to the demineralized water pipeline, the sample suction pipe is connected to the connecting pipeline, and the liquid discharge pipe is connected to the waste liquid storage tank.

[0013] Furthermore, filtering devices are installed at the front end of the water inlet pipe and the front end of the sample suction tube of the online effective chlorine analyzer. The filtering devices can be made of corrosion-resistant materials such as tetrafluoroethylene and fiberglass.

[0014] Furthermore, the sample suction tube of the available chlorine online analyzer is connected to the lowest end of the N-type structural section of the connecting pipeline.

[0015] Furthermore, a box is arranged outside the available chlorine online analyzer, and the box is provided with a heat preservation device, which is a heat medium jacket arranged outside the box, heat preservation cotton or a steam coil arranged inside the box.

[0016] Furthermore, a steam coil is arranged inside the available chlorine online analyzer, and the size of the steam coil is DN15-DN25.

[0017] Furthermore, a temperature sensor is also provided in the box, and the steam coil is interlocked and controlled by the DCS and the temperature sensor.

[0018] Furthermore, the box body is provided with a positive pressure control box and an air intake pipeline for maintaining positive pressure inside the box body. The air intake pipeline contains compressed air or nitrogen, and the air intake pipeline controls the box body to maintain positive pressure through the positive pressure control box.

[0019] Furthermore, the pH monitor and the alkali solution inlet valve are controlled by DCS interlocking; the available chlorine online analyzer and the second delivery pump outlet valve are controlled by DCS interlocking.

[0020] The utility model discloses an online analysis and regulation system for acetylene purification effective chlorine. When working, firstly, desalted water, alkali liquor and chlorine are mixed through a first venturi reactor by controlling flow rate and then enter a sodium hypochlorite preparation tank to be configured into a concentrated sodium hypochlorite solution. The concentrated sodium hypochlorite solution is mixed with primary water through a first delivery pump through a second venturi reactor and then diluted into a dilute sodium hypochlorite solution and enters a sodium hypochlorite dilution tank. The dilute sodium hypochlorite solution is delivered to the inlet pipeline of a washing tower circulation pump through a second delivery pump. Then, the dilute sodium hypochlorite solution is delivered to the top of the washing tower through the washing tower circulation pump to countercurrently contact with the acetylene gas entering the bottom of the washing tower to remove impurities from the acetylene gas.

[0021] A connecting pipeline is arranged at the outlet pipeline of the circulation pump and the inlet pipeline of the circulation pump. The connecting pipeline is used for real-time online sampling of the sodium hypochlorite solution. A pH monitor and an effective chlorine online analyzer for online sampling and analysis are arranged on the connecting pipeline. The pH monitor and the alkali solution inlet valve are controlled by DCS interlocking; the effective chlorine online analyzer and the outlet of the second delivery pump are controlled by DCS interlocking; when the pH of the sodium hypochlorite is not within the control index range, the alkali solution inlet valve automatically adjusts the valve opening to control the alkali solution flow rate, and during the adjustment process, the pH monitor is simultaneously sampled and analyzed online and timely feedback is given through the DCS interlocking, so as to timely adjust the preparation of the upstream sodium hypochlorite solution and quickly achieve the pH within the index range; when the effective chlorine content is not within the control index range, the second delivery pump outlet valve automatically adjusts the valve opening to control the dilute sodium hypochlorite supplementary flow rate, and during the adjustment process, the effective chlorine online analyzer is simultaneously sampled and analyzed online and timely feedback is given through the DCS interlocking, so as to timely adjust the preparation of the upstream sodium hypochlorite solution and quickly achieve the effective chlorine content within the index range.

[0022] Beneficial effects of the utility model:

[0023] 1. Automatic sampling, analysis and adjustment through the online analysis and adjustment system of effective chlorine can solve the problem that manual sampling and analysis is time-consuming and labor-intensive, and easily causes fluctuations in effective chlorine, thus affecting production stability.

[0024] 2. The special design of the connecting pipeline is N-shaped or the upper section is L-shaped and the lower section is N-shaped, which can effectively avoid the problem of inaccurate analysis of the effective chlorine online analysis and adjustment system.

[0025] 3. Set up steam coils through the online chlorine analyzer and realize the automatic temperature adjustment function to solve the problem of being unable to work due to freezing due to weather reasons.

[0026] 4. Through the air inlet pipeline set up by the effective chlorine online analysis and regulation system, the box is kept at a positive pressure to solve the problem of safe use of the effective chlorine online analysis and regulation system in the production site. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the online analysis and regulation system for acetylene purification of effective chlorine;

[0029] Figure 2This is the schematic diagram of the internal installation of the acetylene purification effective chlorine online analyzer box.

[0030] Description of reference numerals:

[0031] 1. Sodium hypochlorite preparation tank; 11. First Venturi reactor; 111. Alkali solution inlet; 112. Chlorine gas inlet; 113. Desalted water inlet; 2. Sodium hypochlorite dilution tank; 21. Second Venturi reactor; 211. Concentrated sodium hypochlorite inlet; 212. Primary water inlet; 3. Washing tower; 4. First delivery pump; 5. Second delivery pump; 6. Circulation pump; 7. Available chlorine online analyzer; 8. pH monitor; 9. Water inlet pipe; 10. Sample suction pipe; 12. Liquid discharge pipe; 13. Box; 14. Steam coil; 15. Air inlet line; 151. Positive pressure controller. DETAILED DESCRIPTION

[0032] The description of the embodiments of this specification should be combined with the corresponding drawings, which should be considered as part of the complete specification. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated for simplification or convenience. Furthermore, the parts of each structure in the drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described in words are in a form known to ordinary technicians in the relevant technical field.

[0033] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0034] like Figure 1 As shown, the utility model provides an acetylene purification effective chlorine online analysis and regulation system, the structure of which includes: a sodium hypochlorite preparation tank 1, a sodium hypochlorite dilution tank 2, a washing tower 3, a pH monitor 8 and an effective chlorine online analyzer 7.

[0035] The sodium hypochlorite preparation tank 1 is used to prepare a concentrated sodium hypochlorite solution. Alkali solution, deionized water, and chlorine gas enter the first venturi reactor 11 through the alkali solution inlet 111, the deionized water inlet 113, and the chlorine gas inlet 112 in a certain proportion, and are fully mixed under the action of the first venturi reactor 11 to be configured into a concentrated sodium hypochlorite solution and enter the sodium hypochlorite preparation tank 1.

[0036] The sodium hypochlorite dilution tank 2 is used to dilute the concentrated sodium hypochlorite solution in the sodium hypochlorite preparation tank 1. The concentrated sodium hypochlorite solution in the sodium hypochlorite preparation tank 1 is delivered to the concentrated sodium hypochlorite inlet 211 of the second venturi reactor 21 by the first delivery pump 4, and enters the second venturi reactor 21 at the same time as the primary water entering from the primary water inlet 212. After being fully mixed in the second venturi reactor 21, it enters the sodium hypochlorite dilution tank 2 to be configured into a dilute sodium hypochlorite solution.

[0037] The washing tower 3 is used to remove impurities such as hydrogen sulfide and phosphine in the acetylene gas. The dilute sodium hypochlorite solution in the sodium hypochlorite dilution tank 2 is delivered to the inlet pipeline of the circulating pump 6 of the washing tower 3 by the second delivery pump 5, and is delivered to the top of the washing tower 3 by the circulating pump 6, and is subjected to countercurrent contact reaction with the acetylene gas entering from the bottom of the washing tower 3, and the oxidizing property of the sodium hypochlorite solution is utilized to remove impurities such as hydrogen sulfide and phosphine in the acetylene gas.

[0038] like Figure 1 As shown, in one embodiment of the utility model, a connecting pipeline is provided between the inlet pipeline and the outlet pipeline of the circulating pump 6 of the washing tower 3, and a pH monitor 8 and an effective chlorine online analyzer 7 are provided on the connecting pipeline. Preferably, the pH monitor is provided on the connecting pipeline near one end of the outlet pipeline of the circulating pump 6, i.e., the inlet end of the connecting pipeline, and the effective chlorine online analyzer 7 is provided on the connecting pipeline near one end of the inlet pipeline of the circulating pump 6, i.e., the outlet end of the connecting pipeline.

[0039] In this embodiment, at least one check valve is provided on the connecting pipeline. The check valve can be provided on the connecting pipeline between the pH monitor 8 and the outlet pipeline of the circulation pump 6, that is, the check valve is provided at the inlet end of the connecting pipeline, or it can be provided on the connecting pipeline between the effective chlorine online analyzer 7 and the inlet pipeline of the circulation pump 6, that is, the check valve is provided at the outlet end of the connecting pipeline. At the same time, a check valve can also be installed at both the inlet end and the outlet end of the connecting pipeline. The function of the check valve is to prevent the material of the inlet pipeline of the circulation pump 6 from entering the outlet pipeline of the circulation pump 6 through the connecting pipeline, and to prevent the inlet pipeline material and the outlet material pipeline liquid from entering the intermediate connecting pipeline at the same time, forming a dead sample, causing the effective chlorine online analyzer 7 and the pH monitor 8 to be unable to accurately analyze the sample, causing an error. Preferably, the check valve is provided at the outlet end of the connecting pipeline.

[0040] like Figure 1 As shown, in one embodiment of the utility model, the connecting pipeline is in an N-type structure, or the upper section of the inlet end of the connecting pipeline is in an L-type structure, and the lower section is in an N-type structure; in this embodiment, the sample suction tube 10 of the effective chlorine online analyzer 7 is connected to the lowest end of the N-type structure section of the connecting pipeline, so as to avoid the sample suction tube 10 being unable to completely absorb the sample, resulting in inaccurate detection data; preferably, the structure of the connecting pipeline is that the upper section of the inlet end is L-shaped, and the lower section and the outlet end are N-shaped.

[0041] like Figure 1 As shown, in one embodiment of the utility model, the water inlet pipe 9 of the effective chlorine online analyzer 7 is connected to the deionized water pipeline, the sample suction tube 10 is connected to the connecting pipeline, and the discharge pipe 12 is connected to the waste liquid storage tank; when the effective chlorine online analyzer 7 detects the effective chlorine content, the effective chlorine online analyzer 7 first draws deionized water through the water inlet pipe for self-cleaning, and after the self-cleaning is completed, the water is discharged to the waste liquid storage tank through the discharge pipe 12, and then the sample suction tube 10 draws the sample to detect the effective chlorine content, and the waste liquid is discharged to the waste liquid storage tank after the detection.

[0042] In this embodiment, the water inlet pipe 9 and the front end of the sample suction tube 10 of the effective chlorine online analyzer 7 are both provided with filtering devices to prevent impurities from entering the effective chlorine online analyzer 7; the filtering device at the front end of the sample suction tube 10 can be made of materials such as tetrafluoroethylene and fiberglass to prevent sodium hypochlorite from corroding the filtering device and thus losing its function.

[0043] like Figure 2 As shown, in one embodiment of the utility model, a box 13 is provided outside the effective chlorine online analyzer 7, and the box 13 is provided with an insulation device and a temperature sensor device built in the box. The insulation device is a steam coil 14 arranged inside the box. The steam coil 14 is interlocked and controlled by the DCS and the temperature sensor device. The set temperature is 5-20°C. When it is lower than the set temperature, the DCS controls the steam valve opening of the steam coil 14 to gradually increase the heating amount to the box and increase the temperature inside the box until the set temperature is reached. When it is higher than the set temperature, the DCS controls the steam valve opening of the steam coil 14 to decrease, so as to reduce the heating amount to the box and lower the temperature inside the box until the set temperature is reached, thereby ensuring that the effective chlorine online analyzer is prevented from being unable to work due to changes in weather and temperature.

[0044] In this embodiment, the box 13 also stores a reagent kit used by the online effective chlorine analyzer 7 to analyze the effective chlorine content, for the online effective chlorine analyzer 7 to automatically collect and use, wherein the reagents are KI (1%) solution and HCL (0.05 mol / l) solution.

[0045] like Figure 2 As shown, in one embodiment of the utility model, an air inlet pipeline 15 is further provided on the box 13 for inputting compressed air into the box 13. The positive pressure inside the box 13 is maintained by a positive pressure controller 151, preferably a micro positive pressure (3-5Kpa). The inside of the box 13 is maintained in a positive pressure state relative to the external environment, which can prevent the danger of explosion caused by the volatilization of chlorine and other components by the effective chlorine online analyzer 7 during sampling and analysis. In addition, the external box 13 of the effective chlorine online analyzer can also be made of explosion-proof material, thereby ensuring the safe operation of the effective chlorine online analyzer at the production site.

[0046] like Figure 1 As shown, in one embodiment of the utility model, the pH monitor and the alkali solution inlet valve are controlled by DCS interlocking, and the effective chlorine online analyzer and the second delivery pump outlet valve are controlled by DCS interlocking.

[0047] In this embodiment, the pH of the sodium hypochlorite solution entering the top of the washing tower 3 is controlled to be 4-6. When the pH is higher or lower than the control index, the valve opening of the alkali solution inlet 111 is automatically adjusted to adjust the amount of alkali solution added, and the pH of the sodium hypochlorite solution is automatically adjusted until the above-mentioned control pH index is met.

[0048] In this embodiment, the effective chlorine content in the sodium hypochlorite solution entering the top of the washing tower 3 is controlled to be 0.1-0.4 g / l. When the effective chlorine content is higher or lower than the control index, the valve of the second delivery pump 5 automatically adjusts the valve opening to adaptively adjust the amount of diluted sodium hypochlorite added to control the effective chlorine content to meet the above control range.

[0049] like Figure 1 As shown, in one embodiment of the utility model, the diameter of the connecting pipeline is DN15-DN50, the purpose is to collect the sodium hypochlorite solution entering the top of the washing tower 3 in time when the material flows fully for online pH analysis, and to avoid the material flowing in the connecting pipeline for a long time to affect the data analysis, and to avoid the washing effect being affected by the large fluctuation of the feed amount of the washing tower 3 during the sampling and analysis due to the large diameter of the connecting pipeline. Preferably, the diameter of the connecting pipeline is DN25.

[0050] like Figure 1 As shown, in one embodiment of the utility model, an electromagnetic regulating valve is installed at the connection between the connecting pipeline and the outlet pipeline of the circulation pump 6, and the effective chlorine online analyzer 7 is interlocked with the electromagnetic regulating valve through program control. When sampling and testing are performed, the electromagnetic regulating valve is opened, and a part of the sodium hypochlorite solution transported to the top of the washing tower 3 in the outlet pipeline of the circulation pump 6 automatically flows into the connecting pipeline and enters the inlet pipeline of the circulation pump 6 and flows out. After controlling the outflow for a regular time (which can be 2-10 minutes), the effective chlorine online analyzer 7 performs automatic sampling and analysis to avoid taking dead samples (i.e., the sodium hypochlorite solution retained in the connecting pipeline during the last sampling) and affecting the analysis data.

[0051] The utility model discloses an online analysis system for effective chlorine in acetylene purification, which detects effective chlorine content and pH value in real time online, timely adjusts the preparation of sodium hypochlorite and the amount of sodium hypochlorite added according to the trend of the detection data to stably control the effective chlorine content and pH value in the washing tower, thereby improving the purification effect of acetylene gas, improving the quality of acetylene, and thus improving the quality of synthetic vinyl acetate; at the same time, it reduces the labor intensity of on-site operators and increases the safety factor of production.

[0052] 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. An acetylene purification effective chlorine online analysis and regulation system, comprising a sodium hypochlorite preparation tank (1), a sodium hypochlorite dilution tank (2), and a washing tower (3), characterized in that: The invention also comprises an effective chlorine online analyzer (7) and a pH monitor (8); the sodium hypochlorite preparation tank is provided with a first venturi reactor (11), the first venturi reactor (11) is provided with an alkali solution inlet (111), a chlorine gas inlet (112), and a desalted water inlet (113); the sodium hypochlorite dilution tank (2) is provided with a second venturi reactor (21), the second venturi reactor (21) is provided with a concentrated sodium hypochlorite liquid inlet (211) and a primary water inlet (212); the sodium hypochlorite preparation tank (1) is connected to the sodium hypochlorite dilution tank (2) via a first delivery pump (4). The washing tower (3) is provided with a circulating pump (6), the inlet pipeline of the circulating pump (6) is connected to the bottom of the washing tower (3), and the outlet pipeline of the circulating pump (6) is connected to the top of the washing tower (3); an outlet is provided at the bottom of the sodium hypochlorite dilution tank (2), and is connected to the inlet of the circulating pump (6) via a second delivery pump (5); a connecting pipeline is provided between the outlet pipeline and the inlet pipeline of the circulating pump (6), and an effective chlorine online analyzer (7) and a pH monitor (8) are provided on the connecting pipeline.

2. The acetylene purification effective chlorine online analysis and regulation system according to claim 1 is characterized in that: The inlet of the connecting pipeline is connected to the outlet pipeline of the circulation pump (6), and the outlet of the connecting pipeline is connected to the inlet pipeline of the circulation pump (6). The connection position is 50-100 cm away from the inlet and outlet of the circulation pump (6). At least one check valve is arranged on the connecting pipeline.

3. The acetylene purification effective chlorine online analysis and regulation system according to claim 1 is characterized in that: The connecting pipeline has an N-shaped structure, or the upper section of the inlet end of the connecting pipeline has an L-shaped structure and the lower section has an N-shaped structure.

4. The acetylene purification effective chlorine online analysis and regulation system according to claim 1, characterized in that: The pH monitor (8) is arranged at the inlet end of the connecting pipeline, and the effective chlorine online analyzer (7) is arranged at the outlet end of the connecting pipeline.

5. The acetylene purification effective chlorine online analysis and regulation system according to claim 1, characterized in that: The available chlorine online analyzer is also provided with a water inlet pipe (9), a sample suction pipe (10), and a liquid discharge pipe (12); the water inlet pipe (9) of the available chlorine online analyzer (7) is connected to the demineralized water pipeline, the sample suction pipe (10) is connected to the connecting pipeline, and the liquid discharge pipe (12) is connected to the waste liquid storage tank.

6. The acetylene purification effective chlorine online analysis and regulation system according to claim 5, characterized in that: A filtering device is also installed at the front end of the water inlet pipe and the front end of the sample suction pipe of the available chlorine online analyzer.

7. The acetylene purification effective chlorine online analysis and regulation system according to claim 5, characterized in that: The sample suction tube (10) of the available chlorine online analyzer (7) is connected to the lowest end of the N-type structural section of the connecting pipeline.

8. The acetylene purification effective chlorine online analysis and regulation system according to claim 1, characterized in that: The available chlorine online analyzer (7) is provided with a box (13) outside, and the box (13) is provided with a heat preservation device, and the heat preservation device is a jacket for passing heat medium arranged outside the box (13), heat preservation cotton, or a steam coil (14) arranged inside the box (13). The box is also provided with an air intake pipeline (15) and a positive pressure control box (151) for maintaining a positive pressure inside the box. Compressed air or nitrogen is inside the air intake pipeline (15), and the air intake pipeline controls the box to maintain a positive pressure through the positive pressure control box (151).

9. The acetylene purification effective chlorine online analysis and regulation system according to claim 8, characterized in that: A steam coil (14) is arranged inside the available chlorine online analyzer. The size of the steam coil (14) is DN15-DN25. The steam coil (14) is linked to the temperature through a DCS.

10. The acetylene purification effective chlorine online analysis and regulation system according to any one of claims 1 to 9, characterized in that: The pH monitor and the alkali solution inlet (111) valve are controlled by a DCS interlock; the available chlorine online analyzer (7) and the second delivery pump (5) outlet valve are controlled by a DCS interlock.

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