Hydrogen peroxide production line tail gas monitoring system

Abstract

The utility model relates to the technical field of hydrogen peroxide production, in particular to a hydrogen peroxide production line tail gas monitoring system which is connected to a waste gas discharge flue, and the waste gas discharge flue is sequentially communicated with a high-temperature heat tracing pipeline, a multi-stage dust removal filter, a measuring chamber and a vacuum pump. An anti-explosion high-temperature sampling probe is arranged at the gas inlet end of the high-temperature heat tracing pipeline, an FID detector and / or an online gas chromatograph are / is arranged in the measuring chamber, the tail gas treatment device comprises a temporary storage tank, a spraying tank and a discharge flue which are sequentially communicated through a pipeline, the temporary storage tank is connected with the output end of a vacuum pump, and the spraying tank is connected with the output end of the vacuum pump. And the spraying tank is connected with a VOC treating agent adding mechanism. The tail gas monitoring system for the hydrogen peroxide production line can be used for detecting non-methane hydrocarbon in waste gas and effectively purifying the detected waste gas.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen peroxide production technology, specifically to a hydrogen peroxide production line exhaust gas monitoring system. Background Technology

[0002] Currently, the production process of hydrogen peroxide emits waste gas containing pollutants such as non-methane hydrocarbons, sulfur dioxide, and nitrogen oxides. If the treatment system is not adjusted in time, the emitted exhaust gas may pollute the environment. Therefore, to address this issue, manufacturers generally use hot and wet extraction methods for online monitoring. Traditional hot and wet extraction methods typically utilize high-temperature hot and wet extraction to analyze the content of pollutants such as sulfur dioxide and nitrogen oxides in the exhaust gas, such as CN221826746U – a hot and wet extraction flue gas online monitoring system. This system uses hydrogen peroxide in a gas filtration device to oxidize pollutants such as sulfur dioxide and nitrogen oxides in the waste gas, thereby purifying these pollutants. However, the waste gas generated during hydrogen peroxide production also contains non-methane hydrocarbons and a small amount of hydrogen peroxide. This detection system not only cannot detect the content of non-methane hydrocarbons in the waste gas, but the internal gas filtration device also cannot remove the non-methane hydrocarbons from the detected waste gas, thus causing environmental pollution.

[0003] In response to the above situation, patent CN202321798549.0 – A waste gas adsorption treatment device with VOCs monitoring function – discloses a technical solution for online monitoring of VOCs concentration in waste gas and treatment of VOCs in waste gas. However, this solution uses a filter-type filtration method, while the industry generally uses activated carbon filter adsorption. Because it uses a filter-replacing method, it requires frequent filter replacement, resulting in high replacement costs, and the monitoring is interrupted during filter replacement. Utility Model Content

[0004] In order to overcome one of the shortcomings of the prior art, the purpose of this utility model is to provide a hydrogen peroxide production line tail gas monitoring system. This hydrogen peroxide production line tail gas monitoring system can detect non-methane total hydrocarbons in the exhaust gas and effectively purify the detected exhaust gas.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A hydrogen peroxide production line exhaust gas monitoring system is connected to an exhaust gas duct, which is sequentially connected to a high-temperature heat tracing pipeline, a multi-stage dust removal filter, a measuring chamber, and a vacuum pump. An explosion-proof high-temperature sampling probe is installed at the inlet end of the high-temperature heat tracing pipeline. The measuring chamber is equipped with an FID detector and / or an online gas chromatograph. The system also includes an exhaust gas treatment device, which comprises a temporary storage tank, a spray tank, and an exhaust duct sequentially connected by pipelines. The temporary storage tank is connected to the output end of the vacuum pump, and the spray tank is connected to a VOC treatment agent addition mechanism.

[0007] Furthermore, the VOC treatment agent addition mechanism includes a supply tank and a metering pump. The supply tank is connected to the spray pipe inside the spray tank via a supply pipe, and the metering pump is installed on the supply pipe.

[0008] Furthermore, a one-way valve is provided in the area between the metering pump and the spray pipe of the supply pipe.

[0009] Furthermore, a mixing valve is provided between the supply pipe and the spray pipe.

[0010] Furthermore, it also includes an explosion-proof treatment unit, which includes a pressure relief pipe and an expansion joint and a pressure relief valve installed on the pressure relief pipe, one end of which is connected to the measuring chamber.

[0011] Furthermore, a filter box is provided at the end of the pressure relief pipe that discharges outward, and a heat exchange bushing is provided outside the area between the filter box and the pressure relief valve.

[0012] Furthermore, it also includes an insulation box, in which the high-temperature heat tracing pipeline, multi-stage dust removal filter and measuring chamber are all installed. The vacuum pump is installed outside the insulation box, and the air inlet end of the high-temperature heat tracing pipeline extends out of the insulation box. A heating plate is installed inside the insulation box.

[0013] Furthermore, the measuring chamber is connected to a gas supply tank via a pipe, and a flow meter and a switching valve are installed on the pipe between the gas supply tank and the measuring chamber.

[0014] Furthermore, the measuring chamber is connected to a backflush tank via a pipe, and an air compressor is connected to the backflush tank. An air intake filter is installed on the air intake end of the air compressor, and a control valve is installed on the pipe between the measuring chamber and the backflush tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model presents an improved exhaust gas monitoring system for a hydrogen peroxide production line, based on existing hot and wet scrubbing methods for flue gas detection. This system can detect not only traditional pollutants but also the concentration of VOCs in the flue gas, enabling the monitoring of multiple substances and improving the overall system's adaptability. Furthermore, a temporary storage tank effectively stores the exhaust gas discharged from the measurement chamber, ensuring stable internal pressure within the entire exhaust gas treatment device and preventing pressure fluctuations within the measurement chamber. By spraying water containing a VOC-removing agent onto the exhaust gas in a spray tower, VOCs are removed through a saponification reaction. The entire reaction process is rapid and effective, requiring no filter replacement. The purification process has low production costs, allows for continuous and uninterrupted exhaust gas treatment, and demonstrates significant overall purification results.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the structure of an improved embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure in another embodiment of the present invention.

[0021] Explanation of icon numbers:

[0022] 10. Exhaust gas exhaust duct; 20. High-temperature heat tracing pipeline; 30. Multi-stage dust removal filter; 40. Measuring chamber; 41. Online gas chromatograph; 42. Make-up gas tank; 43. Flow meter; 44. Switch valve; 45. Backflush tank; 46. Air compressor; 47. Control valve; 48. Inlet filter; 50. Vacuum pump; 60. Explosion-proof high-temperature sampling probe; 70. Tail gas treatment device; 71. Temporary storage tank; 72. Spray tank; 73. Exhaust duct; 74. Supply tank; 75. Metering pump; 76. Supply pipe; 77. Spray pipe; 79. Mixing valve; 80. Explosion-proof treatment unit; 81. Pressure relief pipeline; 82. Expansion joint; 83. Pressure relief valve; 84. Filter box; 85. Heat exchange bushing; 90. Insulation box; 91. Heating plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] Reference Figures 1 to 3The system shown is a hydrogen peroxide production line exhaust gas monitoring system connected to an exhaust duct 10. The exhaust duct 10 is sequentially connected to a high-temperature heat tracing pipeline 20, a multi-stage dust filter 30, a measuring chamber 40, and a vacuum pump 50. An explosion-proof high-temperature sampling probe 60 is installed at the air inlet of the high-temperature heat tracing pipeline 20. An FID detector and / or an online gas chromatograph 41 are installed in the measuring chamber 40. The system also includes an exhaust gas treatment device 70, which includes a temporary storage tank 71, a spray tank 72, and an exhaust duct 73 connected sequentially by pipelines. The temporary storage tank 71 is connected to the output end of the vacuum pump 50, and a VOC treatment agent addition mechanism is connected to the spray tank 72.

[0025] In this application, other probes, such as sensors or detectors for detecting sulfur dioxide and nitrogen oxides, can also be installed in the measuring chamber 40, which can be used as a conventional hot and wet method detection system. If the aforementioned sensors or detectors are not installed, and only an FID detector and / or online gas chromatograph 41 are installed in this application, then only the non-methane total hydrocarbons in the exhaust gas need to be detected. The VOC treatment agent is a conventional reagent, such as a polymer adsorption resin or molecular sieve, or it can be a solvent containing activated carbon or clay particles, which will not be described in detail here.

[0026] Furthermore, in this application, the online gas chromatograph 41 can simultaneously detect the concentrations of methane and total hydrocarbons. In actual operation, the concentration of non-methane total hydrocarbons is obtained by subtracting the methane concentration from the total hydrocarbon concentration. The FID detector, a typical destructive, mass-based detector, uses a flame generated by the combustion of hydrogen and air as its energy source. When organic compounds enter the flame, they undergo chemical ionization at high temperatures, producing ions with a current several orders of magnitude higher than the baseline current. Under the directional action of a high-voltage electric field, an ion current is formed. This weak ion current is amplified by high impedance, becoming an electrical signal proportional to the amount of organic compounds entering the flame. Therefore, the signal magnitude can be used for quantitative analysis of organic matter. Both of the above detection devices can detect the content of various substances within VOCs, which is beneficial for the background system to detect the concentration of non-methane total hydrocarbons.

[0027] This hydrogen peroxide production line exhaust gas monitoring system is an improvement upon existing hot and wet scrubbing methods for flue gas detection. In addition to detecting traditional pollutants, the system can now also detect the concentration of VOCs in the flue gas, enabling the monitoring of multiple substances and improving the overall system's adaptability. Furthermore, the temporary storage tank 71 effectively stores the exhaust gas discharged from the measuring chamber 40, ensuring the stability of the internal pressure of the entire exhaust gas treatment device 70 and preventing any impact on the pressure within the measuring chamber 40. By spraying water containing a VOC-removing agent onto the exhaust gas in a spray tower, VOCs are removed through a saponification reaction. The entire reaction process is rapid and effective, requiring no filter replacement. The entire purification process has low production costs, allows for continuous and uninterrupted exhaust gas treatment, and demonstrates a significant overall purification effect.

[0028] See Figures 1 to 2 In one embodiment of this application, to facilitate the supply of VOC treatment agent, the VOC treatment agent addition mechanism includes a supply tank 74 and a metering pump 75. The supply tank 74 is connected to the spray pipe 77 inside the spray tank 72 via a supply pipe 76, and the metering pump 75 is installed on the supply pipe 76. The VOC treatment agent supplied in the supply pipe 76 can mix with the liquid supplied in the spray pipe 77, which facilitates improved subsequent treatment capacity. The liquid supplied in the spray pipe 77 is generally purified water or an alkaline solution. Furthermore, the spray pipe 77 can be directly connected to an external spray liquid supply system, or it can be a separate supply system, such as a structure similar to the VOC treatment agent addition mechanism, which will not be detailed here.

[0029] Furthermore, in one embodiment of this application, a one-way valve 78 is provided in the region between the metering pump 75 and the spray pipe 77 in the supply pipe 76. Additionally, in the above embodiments, a mixing valve 79 is provided between the supply pipe 76 and the spray pipe 77 to facilitate mixing of the spray liquid and the VOC treatment agent, thereby facilitating control of the mixing concentration.

[0030] In the above embodiments, since this monitoring system is an improvement on the existing hot and wet flue gas online monitoring system, the entire monitoring process needs to be carried out at high temperatures. Therefore, to ensure the normal operation of the entire system, this application also includes an insulation box 90. The high-temperature heat tracing pipeline 20, the multi-stage dust removal filter 30, and the measuring chamber 40 are all installed inside the insulation box 90. The vacuum pump 50 is installed outside the insulation box 90, and one end of the high-temperature heat tracing pipeline 20 extends out of the insulation box 90. A heating plate 91 is installed inside the insulation box 90. This structure facilitates the insulation of the monitoring system, facilitates the installation of the above structure, and also facilitates the overall installation and transportation in the later stages.

[0031] See Figure 2Because the monitored exhaust gas contains a large amount of flammable substances and some pollutants, to avoid a violent reaction and explosion during treatment, this application also includes an explosion-proof treatment unit 80. The explosion-proof treatment unit 80 includes a pressure relief pipe 81, an expansion joint 82, and a pressure relief valve 83 installed on the pressure relief pipe 81. One end of the pressure relief pipe 81 is connected to the measuring chamber 40. The main function of the expansion joint 82 is to allow for rapid expansion in the event of an explosion within the measuring chamber 40, preventing high pressure from damaging other equipment. Under normal monitoring conditions, the explosion-proof treatment unit 80 is generally not used.

[0032] Furthermore, in the above embodiments, to avoid environmental pollution from the exhaust gas after pressure relief, in an improved embodiment of this application, a filter box 84 is provided at the end of the pressure relief pipe 81 that discharges outward, and a heat exchange bushing 85 is provided outside the area between the filter box 84 and the pressure relief valve 83 of the pressure relief pipe 81. The main function of the heat exchange bushing 85 is to cool the pressure relief pipe 81 and improve safety. Under normal testing conditions, the heat exchange bushing 85 does not work, or it is connected to the external water supply system through a control valve. Only when the pressure in the measuring chamber 40 exceeds the threshold is the control valve connected to the external water supply system, thereby realizing heat exchange and cooling of the pressure relief pipe 81.

[0033] See Figure 3 In one embodiment of this application, to ensure pressure stability during the testing process, the measuring chamber 40 is connected to an air supply tank 42 via a pipe. A flow meter 43 and a switching valve 44 are installed on the pipe between the air supply tank 42 and the measuring chamber 40. For this purpose, a pressure sensor is also installed inside the measuring chamber 40. The flow meter 43 and the pressure sensor are connected to a central control system, which controls the opening degree of the switching valve 44 based on the pressure sensor readings.

[0034] In the above-described improved embodiments, to ensure the accuracy of the detection data, especially in the detection of conventional pollutants such as sulfur dioxide and nitrogen oxides, and to prevent previous detections or residual pollutants from affecting the current detection results, the measuring chamber 40 is connected to a backflush tank 45 via a pipeline. An air compressor 46 is connected to the backflush tank 45, and an intake filter 48 is installed at the air inlet of the air compressor 46. A control valve 47 is installed on the pipeline between the measuring chamber 40 and the backflush tank 45. The backflush tank 45 contains high-pressure gas for backflushing the entire detection system, facilitating the formation of a protective environment. Of course, in some embodiments, the air compressor 46 can be replaced with other gas generating equipment, such as oxygen or carbon dioxide, to create a protective gas environment within the monitoring system and reduce the influence of air components on the monitoring results.

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A hydrogen peroxide production line exhaust gas monitoring system, connected to a flue gas duct, wherein the flue gas duct is sequentially connected to a high-temperature heat tracing pipeline, a multi-stage dust removal filter, a measuring chamber, and a vacuum pump; an explosion-proof high-temperature sampling probe is installed at the air inlet end of the high-temperature heat tracing pipeline, characterized in that, The measuring chamber is equipped with an FID detector and / or an online gas chromatograph, and also includes an exhaust gas treatment device. The exhaust gas treatment device includes a temporary storage tank, a spray tank and an exhaust flue connected in sequence by pipelines. The temporary storage tank is connected to the output end of a vacuum pump, and the spray tank is connected to a VOC treatment agent addition mechanism.

2. The hydrogen peroxide production line exhaust gas monitoring system according to claim 1, characterized in that: The VOC treatment agent addition mechanism includes a supply tank and a metering pump. The supply tank is connected to the spray pipe inside the spray tank through a supply pipe, and the metering pump is installed on the supply pipe.

3. The hydrogen peroxide production line exhaust gas monitoring system according to claim 2, characterized in that: A one-way valve is installed in the area between the metering pump and the spray pipe of the supply pipe.

4. The hydrogen peroxide production line exhaust gas monitoring system according to claim 2, characterized in that: A mixing valve is installed between the supply pipe and the spray pipe.

5. The hydrogen peroxide production line tail gas monitoring system according to claim 1, characterized in that: It also includes an explosion-proof treatment unit, which includes a pressure relief pipe and an expansion joint and a pressure relief valve installed on the pressure relief pipe, one end of which is connected to the measuring chamber.

6. The hydrogen peroxide production line tail gas monitoring system according to claim 5, characterized in that: A filter box is installed at the end of the pressure relief pipe that discharges outward, and a heat exchange bushing is installed outside the area between the filter box and the pressure relief valve.

7. A hydrogen peroxide production line exhaust gas monitoring system according to any one of claims 1-6, characterized in that: It also includes an insulated box, in which the high-temperature heat tracing pipeline, multi-stage dust removal filter and measuring chamber are all installed. The vacuum pump is installed outside the insulated box, and the air inlet end of the high-temperature heat tracing pipeline extends out of the insulated box. A heating plate is installed inside the insulated box.

8. A hydrogen peroxide production line tail gas monitoring system according to any one of claims 1-6, characterized in that: The measuring chamber is connected to a gas supply tank via a pipe, and a flow meter and a switch valve are installed on the pipe between the gas supply tank and the measuring chamber.

9. A hydrogen peroxide production line exhaust gas monitoring system according to any one of claims 1-6, characterized in that: The measuring chamber is connected to a backflush tank via a pipe. An air compressor is connected to the backflush tank. An air intake filter is installed on the air intake end of the air compressor. A control valve is installed on the pipe between the measuring chamber and the backflush tank.

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