Online monitoring analyzer for chlor-alkali gas

Abstract

The utility model discloses a chlor-alkali gas on-line monitoring analyzer which comprises a cabinet, a pretreatment system, a hydrogen chloride analyzer and a chlorine analyzer, the pretreatment system is connected with the gas inlet ends of the hydrogen chloride analyzer and the chlorine analyzer, and the outlet ends of the hydrogen chloride analyzer and the chlorine analyzer are connected with a sample return port; the hydrogen chloride analyzer comprises a fluorescent lamp and an ultraviolet fluorescent sensor; the chlorine analyzer comprises a first sensor, a second sensor, a micro heater and an arithmetic unit, the first sensor is arranged at the front end of the gas path, and the micro heater is arranged between the first sensor and the second sensor and connected with the first sensor and the second sensor through the gas path; and the arithmetic unit establishes data transmission connection with the first sensor and the second sensor. According to the utility model, hydrogen chloride and chlorine gas generated in the production process can be monitored online in real time, the production safety is effectively guaranteed, the equipment is free of special consumable products, spare parts do not need to be replaced every year, self-maintenance is easy, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas monitoring, in particular to an online chlor-alkali gas monitoring and analysis machine. Background Art

[0002] Chlor-alkali gas mainly refers to hydrogen chloride and chlorine. Chlorine is usually manufactured by electrolyzing brine (sodium chloride or potassium chloride). This process will also produce a small amount of hydrogen in the chlorine gas flow. If there is a large amount of hydrogen, it means that the mercury battery and the permeable membrane have failed, and a highly dangerous explosive mixture of hydrogen and chlorine may be formed. Therefore, real-time monitoring of the chlor-alkali gas produced in the production of the chlor-alkali industry and timely treatment before the concentration of the mixed gas reaches the explosion point can effectively reduce the risk of explosion of the mixed gas and ensure the safe production of the chlor-alkali industry. At present, there is a lack of effective online monitoring and analysis equipment for chlor-alkali gas in application scenarios such as hydrogen chloride synthesis furnaces, chlor-alkali gas tank filling, and chlor-alkali chemical production.

[0003] Therefore, we designed an online monitoring and analysis machine for chlor-alkali gas to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an online monitoring and analyzing machine for chlor-alkali gas.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A chlor-alkali gas online monitoring and analysis machine comprises a cabinet, a pretreatment system, a hydrogen chloride analyzer and a chlorine analyzer, wherein the pretreatment system, the hydrogen chloride analyzer and the chlorine analyzer are all arranged inside the cabinet, the air inlet end of the pretreatment system for treating sample gas is connected to a sample inlet, the air outlet end is connected to the air inlet ends of the hydrogen chloride analyzer and the chlorine analyzer, and the outlet ends of the hydrogen chloride analyzer and the chlorine analyzer are connected to a sample return port.

[0007] The hydrogen chloride analyzer includes a fluorescent lamp and an ultraviolet fluorescence sensor; the chlorine analyzer includes a first sensor, a second sensor, a micro heater and a computing unit, wherein the first sensor is arranged at the front end of the gas path, the micro heater is arranged between the first sensor and the second sensor and connected with the first sensor and the second sensor through the gas path, and the computing unit establishes a data transmission connection with the first sensor and the second sensor.

[0008] Further preferably, a power connection box and a signal connection box are externally mounted on one side of the cabinet, and a switch group for controlling the opening and closing of various devices in the analyzer is arranged between the power connection box and the signal connection box.

[0009] Further preferably, the pretreatment system includes a nano-tube, a capsule filter, a coalescer, an air pressure regulating filter and a gas-liquid separation tank, two of the gas-liquid separation tanks are arranged in series, one end of which is connected to the sample inlet, and the other end is connected to the drain port, one end of the coalescer is connected to each gas-liquid separation tank, and the other end is connected to the air inlet end of the capsule filter, the air outlet end of the capsule filter is connected to the air inlet end of the nano-tube, the air outlet end of the nano-tube is connected to the air inlet ends of the hydrogen chloride analyzer and the chlorine analyzer, and the nano-tube is connected to the nitrogen discharge port.

[0010] Further preferably, the air inlet end of the nano-tube is connected to the calibration port, and a diaphragm valve is provided on the pipeline connecting the calibration port and the nano-tube, and the diaphragm valve is also provided on the pipeline between the sample inlet and the gas-liquid separation tank, between the gas-liquid separation tank and the drain port, and between the nano-tube and the capsule filter.

[0011] Further preferably, the air inlet ends of the nano-distribution tube and the capsule filter are also connected to a nitrogen inlet for conveying nitrogen for purging, and the air pressure regulating filter, needle valve and flow meter are sequentially arranged on the pipeline between the nitrogen inlet and the nano-distribution tube, and the air outlet end of the air pressure regulating filter and the air inlet end of the needle valve are connected to the air inlet end of the capsule filter through a pipeline.

[0012] Further preferably, a flow meter for detecting gas flow is provided on the pipeline connecting the outlet ends of the hydrogen chloride analyzer and the chlorine analyzer with the sample return port.

[0013] Further preferably, both the first sensor and the second sensor are thermal conductivity sensors.

[0014] Further preferably, a top cover is provided on the top of the cabinet, and hanging ears for lifting the cabinet are provided on both sides of the top cover.

[0015] Further preferably, the chlor-alkali gas online monitoring and analysis machine also includes an electric heater for heating the interior of the cabinet, and the electric heater is arranged in the lower part of the cabinet.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: the analyzer proposed by the utility model can be used in the gas lines of hydrogen chloride synthesis furnaces, chlor-alkali gas tank filling, and chlor-alkali chemical production equipment to conduct real-time online monitoring of hydrogen chloride and chlorine generated in the production process, effectively ensuring the safety of production. The analyzer has no special consumables, does not need to replace spare parts every year, is easy to maintain by itself, and reduces costs. When using the analyzer, the sample gas is cleaned and dried by the pretreatment system to ensure that the best gas is provided to the sensor. At the same time, it is equipped with a calibration port, flow meter and needle valve, which has higher accuracy in gas flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of an online chlor-alkali gas monitoring and analysis machine proposed by the utility model;

[0018] Figure 2 The utility model provides an online monitoring and analysis machine for chlor-alkali gas;

[0019] Figure 3 The utility model provides an online monitoring and analysis machine for chlor-alkali gas;

[0020] Figure 4 The utility model provides an online monitoring and analyzing machine for chlor-alkali gas.

[0021] Numbers in the figure: 10, cabinet; 11, power connection box; 12, switch group; 13, signal connection box; 14, sample return port; 15, nitrogen inlet; 16, calibration port; 17, sample inlet; 18, nitrogen discharge port; 19, drain port; 20, hydrogen chloride analyzer; 21, chlorine analyzer; 22, nanotube; 23, capsule filter; 24, coalescer; 25, diaphragm valve; 26, air pressure regulating filter; 27, needle valve; 28, gas-liquid separation tank; 29, flow meter; 30, electric heater; 31, top cover; 32, hanging ear. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-Figure 4 In this embodiment, a chlor-alkali gas online monitoring and analysis machine proposed includes a cabinet 10, a pretreatment system, a hydrogen chloride analyzer 20 and a chlorine analyzer 21. The pretreatment system, the hydrogen chloride analyzer 20 and the chlorine analyzer 21 are all arranged inside the cabinet 10. The air inlet end of the pretreatment system for treating the sample gas is connected to the sample inlet 17, and the air outlet end is connected to the air inlet end of the hydrogen chloride analyzer 20 and the chlorine analyzer 21. The outlet end of the hydrogen chloride analyzer 20 and the chlorine analyzer 21 is connected to the sample return port 14.

[0024] The hydrogen chloride analyzer 20 includes a fluorescent lamp and an ultraviolet fluorescence sensor; the sample gas after being processed by the pretreatment system enters the hydrogen chloride analyzer 20, and the molecules of the substance in the ground state are irradiated by the excitation light (i.e., ultraviolet light) of the fluorescent lamp, and absorb the excitation energy, and the molecules of the substance are in an excited state. A part of the energy of the excited state molecules is consumed in vibration, so the molecules are in a vibration energy level, and when they return to the ground state from the vibration energy level, the excess energy is released in other forms, namely, fluorescence, and different substances can emit fluorescence of different wavelengths. The ultraviolet fluorescence sensor collects the fluorescence emitted at different wavelengths, and judges different substances and contents according to the fluorescence of different light colors and the intensity of the fluorescence, and measures and analyzes the precise gas concentration content of hydrogen chloride.

[0025] The chlorine analyzer 21 includes a first sensor, a second sensor, a micro heater and a computing unit. The first sensor and the second sensor in the present embodiment are both thermal conductivity sensors. The first sensor is arranged at the front end of the gas path, the micro heater is arranged between the first sensor and the second sensor, and is connected to the first sensor and the second sensor through the gas path, and the computing unit establishes a data transmission connection with the first sensor and the second sensor. The sample gas treated by the pretreatment system first passes through the first sensor, and hydrogen reacts with chlorine in the micro heater. Then it passes through the second sensor, and through two independent measurements, the heat conduction rate and the temperature difference are measured. The computing unit can calculate the thermal conductivity of the gas, compare the changes in the thermal conductivity coefficient of the gas before and after the two times and perform the operation, and can accurately display the content of hydrogen and chlorine.

[0026] A power connection box 11 and a signal connection box 13 are hung on the outside of one side of the cabinet 10. The power connection box 11 is located above the signal connection box 13. A switch group 12 for controlling the opening and closing of various devices in the analyzer is arranged between the power connection box 11 and the signal connection box 13. In order to facilitate transportation and use, a top cover 31 is arranged on the top of the cabinet 10, and hanging ears 32 for lifting the cabinet 10 are arranged on both sides of the top cover 31. The cabinet 10 can adopt a weather-resistant GRP chassis, and the electrical device can be installed outdoors.

[0027] It is worth mentioning that the pretreatment system of this embodiment includes a nanotube 22, a capsule filter 23, a coalescer 24, an air pressure regulating filter 26 and a gas-liquid separation tank 28. The nanotube 22 is a new type of moisture exchange material, which removes moisture from the sample gas based on the humidity difference between the inside and outside of the tube. Specifically, in conjunction with this example, the nanotube 22 removes water through the flow difference and pressure difference between the sample gas path and the nitrogen purge gas path. The water vapor enters the nitrogen purge gas path from the sample gas path and then enters the gas-liquid separation tank 28 after passing through the coalescer 24.

[0028] In this embodiment, two gas-liquid separation tanks 28 are arranged in series up and down, one end of the gas-liquid separation tank 28 is connected to the sample inlet 17, and the other end is connected to the drain port 19. A diaphragm valve 25 for opening and closing the gas pipeline is arranged on the pipeline between the gas-liquid separation tank 28 and the sample inlet 17, a needle valve 27 is arranged between the two gas-liquid separation tanks 28, and a diaphragm valve 25 is also arranged on the pipeline between the gas-liquid separation tank 28 and the drain port 19. The diaphragm valve 25 uses a diaphragm as an opening and closing member to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body and the inner cavity of the valve cover. The diaphragm valve 25 has a simple structure, good sealing and anti-corrosion performance, small fluid resistance, and can be controlled pneumatically or electrically.

[0029] One air inlet end of the coalescer 24 is connected to each gas-liquid separation tank 28, and the air outlet end of the other end is connected to the air inlet end of the capsule filter 23, and a needle valve 27 is provided on the pipeline connecting the coalescer 24 and the gas-liquid separation tank 28 at the lower end. The capsule filter 23 has a large filtering area and can process a large amount of fluid to improve the flux. The air outlet end of the capsule filter 23 is connected to the air inlet end of the nano-distribution tube 22, and a diaphragm valve 25 is provided between the air outlet end of the capsule filter 23 and the air inlet end of the nano-distribution tube 22. The air outlet end of the nano-distribution tube 22 is connected to the air inlet end of the hydrogen chloride analyzer 20 and the chlorine analyzer 21, and the nano-distribution tube 22 is also connected to the nitrogen discharge port 18.

[0030] It should be noted that a calibration gas circuit and a purge gas circuit are also provided in this embodiment. The air inlet end of the nano-distribution tube 22 is connected to the calibration port 16, and a diaphragm valve 25 is provided on the pipeline connecting the calibration port 16 and the nano-distribution tube 22. The air inlet end of the nano-distribution tube 22 and the capsule filter 23 is also connected to a nitrogen inlet 15 for conveying nitrogen purge, and an air pressure regulating filter 26, a needle valve 27 and a flow meter 29 are sequentially provided on the pipeline between the nitrogen inlet 15 and the nano-distribution tube 22. The air outlet end of the air pressure regulating filter 26 and the air inlet end of the needle valve 27 are connected to the air inlet end of the capsule filter 23 through a pipeline, and a diaphragm valve 25 is provided between the air pressure regulating filter 26 and the capsule filter 23.

[0031] In order to measure the sample gas discharged through the sample return port 14 , a flow meter 29 for detecting the gas flow is provided on the pipeline connecting the outlet ends of the hydrogen chloride analyzer 20 and the chlorine analyzer 21 with the sample return port 14 .

[0032] In order to ensure that the temperature inside the cabinet 10 is within a relatively constant range, an electric heater 30 is further provided in the online monitoring and analysis machine for chlor-alkali gas in this embodiment, and the electric heater 30 is provided at the lower part of the cabinet 10, and a temperature monitor used in conjunction therewith is also provided inside the cabinet 10. Maintaining the ambient temperature inside the cabinet 10 is conducive to improving the accuracy of monitoring the sample gas.

[0033] In order to facilitate the connection with the external gas pipeline, the sample return port 14, the nitrogen inlet 15, the calibration port 16, the sample inlet 17, the nitrogen exhaust port 18 and the drain port 19 all pass through the side of the cabinet 10, and the sample return port 14, the nitrogen inlet 15, the calibration port 16, the sample inlet 17 and the drain port 19 are arranged on one side of the cabinet 10 from top to bottom, the nitrogen exhaust port 18 is arranged on the other side of the cabinet 10, and the nitrogen exhaust port 18 is located below the signal junction box 13.

[0034] Working principle:

[0035] First, the calibration gas is introduced through the calibration port 16 and the nano-distribution tube 22 to calibrate the hydrogen chloride analyzer 20 and the chlorine analyzer 21. Then the sample gas to be detected enters the pretreatment system through the sample inlet 17 for sample gas impurity removal and purification. The sample gas passes through the gas-liquid separation tank 28 for gas-liquid separation, and further removes the liquid in the sample gas and filters through the coalescer 24 and the capsule filter 23. Nitrogen enters the air pressure regulating filter 26 through the nitrogen inlet 15 and enters the nano-distribution tube 22 after filtration. Water is further removed through the flow difference and pressure difference between the sample gas path and the nitrogen gas path. The water vapor enters the nitrogen purge gas path from the sample gas path, passes through the coalescer 24, enters the gas-liquid separation tank 28, and is discharged from the cabinet 10 through the drain port 19. The nitrogen is discharged from the cabinet 10 through the nitrogen discharge port 18. The sample gas treated by the pretreatment system enters the hydrogen chloride analyzer 20 and the chlorine analyzer 21, and the chlorine and hydrogen chloride gases are monitored and analyzed respectively.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A chlor-alkali gas online monitoring and analysis machine, characterized in that: The invention comprises a cabinet (10), a pretreatment system, a hydrogen chloride analyzer (20) and a chlorine gas analyzer (21); the pretreatment system, the hydrogen chloride analyzer (20) and the chlorine gas analyzer (21) are all arranged inside the cabinet (10); an air inlet end of the pretreatment system for processing sample gas is connected to a sample inlet (17); an air outlet end is connected to air inlets of the hydrogen chloride analyzer (20) and the chlorine gas analyzer (21); and outlet ends of the hydrogen chloride analyzer (20) and the chlorine gas analyzer (21) are connected to a sample return port (14); The hydrogen chloride analyzer (20) comprises a fluorescent lamp and an ultraviolet fluorescence sensor; the chlorine gas analyzer (21) comprises a first sensor, a second sensor, a micro heater and a computing unit, wherein the first sensor is arranged at the front end of the gas path, the micro heater is arranged between the first sensor and the second sensor and connected to the first sensor and the second sensor via the gas path, and the computing unit establishes a data transmission connection with the first sensor and the second sensor.

2. The chlor-alkali gas online monitoring and analysis machine according to claim 1, characterized in that: A power connection box (11) and a signal connection box (13) are hung on the outside of one side of the cabinet (10), and a switch group (12) for controlling the opening and closing of various devices in the analyzer is arranged between the power connection box (11) and the signal connection box (13).

3. The chlor-alkali gas online monitoring and analysis machine according to claim 1, characterized in that: The pretreatment system comprises a nano-separation tube (22), a capsule filter (23), a coalescer (24), an air pressure regulating filter (26) and a gas-liquid separation tank (28). Two gas-liquid separation tanks (28) are arranged in series, one end of which is connected to the sample inlet (17) and the other end is connected to the liquid discharge port (19). One end of the coalescer (24) is connected to each gas-liquid separation tank (28) and the other end is connected to the air inlet end of the capsule filter (23). The air outlet end of the capsule filter (23) is connected to the air inlet end of the nano-separation tube (22). The air outlet end of the nano-separation tube (22) is connected to the air inlet end of the hydrogen chloride analyzer (20) and the chlorine analyzer (21). The nano-separation tube (22) is connected to the nitrogen discharge port (18).

4. The chlor-alkali gas online monitoring and analysis machine according to claim 3, characterized in that: The air inlet end of the nano-sample tube (22) is connected to the calibration port (16), and a diaphragm valve (25) is provided on the pipeline connecting the calibration port (16) and the nano-sample tube (22). The diaphragm valve (25) is also provided on the pipeline between the sample inlet (17) and the gas-liquid separation tank (28), between the gas-liquid separation tank (28) and the liquid discharge port (19), and between the nano-sample tube (22) and the capsule filter (23).

5. The chlor-alkali gas online monitoring and analysis machine according to claim 3, characterized in that: The air inlet end of the nano-distribution tube (22) and the capsule filter (23) is also connected to a nitrogen inlet (15) for conveying nitrogen for purging. The air pressure regulating filter (26), the needle valve (27) and the flow meter (29) are sequentially arranged on the pipeline between the nitrogen inlet (15) and the nano-distribution tube (22). The air outlet end of the air pressure regulating filter (26) and the air inlet end of the needle valve (27) are connected to the air inlet end of the capsule filter (23) via a pipeline.

6. The chlor-alkali gas online monitoring and analysis machine according to claim 5, characterized in that: A flow meter (29) for detecting gas flow is provided on a pipeline connecting the outlet ends of the hydrogen chloride analyzer (20) and the chlorine analyzer (21) with the sample return port (14).

7. The chlor-alkali gas online monitoring and analysis machine according to claim 1, characterized in that: The first sensor and the second sensor are both thermal conductivity sensors.

8. The chlor-alkali gas online monitoring and analysis machine according to claim 1, characterized in that: A top cover (31) is arranged on the top of the cabinet (10), and hanging ears (32) for lifting the cabinet (10) are arranged on both sides of the top cover (31).

9. The chlor-alkali gas online monitoring and analysis machine according to claim 1, characterized in that: It also includes an electric heater (30) for heating the interior of the cabinet (10); the electric heater (30) is arranged at the lower part of the cabinet (10).

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