On-line monitoring system for malodorous gas

Abstract

The invention provides an online malodorous gas monitoring system. The system comprises a gas monitoring module, a gas collection module, a power supply module, a data processing and storage module and a communication module which are arranged in a box body, the gas monitoring module is used for monitoring the concentration of foul gas in real time; the gas collection module is communicated with a gas path of the gas monitoring module and is used for supplying a to-be-monitored gas sample to the gas monitoring module; the power supply module is electrically connected with the gas monitoring module and is used for providing direct-current voltage for the gas monitoring module; the data processing and storage module is in communication connection with the gas monitoring module and is used for processing the gas real-time monitoring data to obtain a real-time malodorous gas concentration value and storing the malodorous gas concentration value; and the communication module is in communication connection with the data processing and storage module and is used for sending the foul gas concentration value obtained by processing to a far-end computer. The method has high accuracy on the concentration value of the malodorous gas of the gas sample.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental monitoring equipment, and in particular relates to an online monitoring system for malodorous gases. Background Art

[0002] Malodor refers to gaseous substances that stimulate the olfactory organs and cause people to feel uncomfortable and damage the living environment. There are many types of malodorous gases, and there are dozens of them that are harmful to human health. Places that are prone to produce malodorous gases include: landfills, garbage disposal stations, garbage power plants, garbage incineration sites, chemical plants, farms, sewage treatment plants, etc.

[0003] The odor pollutants produced in the above-mentioned places generally have the characteristic of low olfactory threshold concentration, which can easily cause discomfort to the human respiratory system. The main components of malodorous gases include nitrogen-containing compounds, sulfides, hydrocarbons and aromatic hydrocarbons, halogenated hydrocarbons, and oxygen-containing organic substances such as ketones, alcohols, aldehydes, and phenols. The "Emission Standard of Odor Pollutants" (GB 14554-93) promulgated by my country stipulates 8 types of malodorous substances that need to be controlled, namely hydrogen sulfide (H2S), methyl mercaptan (CH3SH), methyl sulfide ((CH3)2S), dimethyl disulfide ((CH3)2S2), carbon disulfide (CS2), ammonia (NH3), trimethylamine ((CH3)3N), and styrene (AR-CH=CH2).

[0004] The traditional odor monitoring method is the "three-point comparison olfactory bag method (GB / T14675-93)" formulated according to national standards. As a test method based on human olfactory senses, its sampling and analysis process all rely on manual operation. When conducting olfactory identification and analysis, there are many restrictive conditions for the testers, resulting in a series of problems such as low work efficiency, poor timeliness, and poor data objectivity.

[0005] In addition, the matrix sensor odor gas monitoring devices currently on the market have poor accuracy and most of them only display the values ​​measured by each sub-sensor itself, while there is no correlation between the sub-sensors, and the measurement results are not ideal.

[0006] Based on the above, this application provides a technical solution to solve the above technical problems. Summary of the invention

[0007] In view of the fact that the "three-point comparison sniff bag method" in the prior art relies on human olfactory senses, its sampling and analysis process all rely on manual operation. When conducting olfactory identification analysis, there are many restrictive conditions for the detection personnel, resulting in low work efficiency, poor timeliness, and poor data objectivity; the existing matrix sensor odor gas monitoring device has poor accuracy and no correlation is formed between the sub-sensors. An odor gas online monitoring system is now provided to at least solve at least one of the above-mentioned technical problems.

[0008] In a preferred embodiment of the present invention, the embodiment of the present application provides an online monitoring system for malodorous gases, the system comprising: a gas monitoring module, a gas collection module, a data processing and storage module, a communication module and a power supply module arranged in a box;

[0009] The gas monitoring module is used to monitor the concentration of malodorous gases in real time;

[0010] The gas collection module is in gas communication with the gas monitoring module, and is used to supply the gas sample to be monitored to the gas monitoring module;

[0011] The data processing and storage module is in communication with the gas monitoring module, and is used to process the real-time gas monitoring data, obtain the real-time malodorous gas concentration value, and store the malodorous gas concentration value;

[0012] The communication module is in communication connection with the data processing and storage module, and is used to send the processed malodorous gas concentration value to a remote computer;

[0013] The power supply module is electrically connected to the gas monitoring module, the data processing and storage module, and the communication module, and is used to provide a DC voltage to the above modules.

[0014] Furthermore, the gas monitoring module includes a plurality of gas monitoring sub-units, each of which monitors a different type of target gas, and the gas monitoring sub-units can be increased or decreased according to changes in the type of the target gas to be monitored.

[0015] Furthermore, each of the gas monitoring subunits includes a gas sensor unit, a data processing unit, a data sending unit, a first display unit and an outer shell. The gas sensor unit, the data processing unit, the data sending unit and the first display unit are accommodated in the outer shell. The outer shell is provided with a gas inlet and a gas exhaust port. The gas to be monitored entering from the gas inlet is discharged from the gas exhaust port after being detected by the gas sensor unit.

[0016] Furthermore, the data processing unit in each of the gas monitoring subunits is communicatively connected with the gas sensor unit to process and generate a concentration value of the target gas in the gas sample monitored by the gas monitoring subunit, and the first display unit displays the concentration value of the target gas.

[0017] Furthermore, the gas sensor unit is any one of a metal oxide semiconductor gas sensor, a potential electrolysis sensor, a contact combustion gas sensor, and an electrochemical gas sensor.

[0018] Furthermore, the concentration value of the target gas in the gas sample monitored by each of the gas monitoring sub-units is sent to the data processing and storage module of the malodorous gas online monitoring system via the corresponding data sending unit.

[0019] Furthermore, the data processing and storage module of the malodorous gas online monitoring system substitutes the concentration value of the target gas in the gas sample monitored by each gas monitoring subunit into the fitting formula for processing to obtain the odor concentration value of the gas sample. The processing formula is as follows:

[0020]

[0021] Among them, A is the concentration value of the odorous gas in the gas sample, a i is the weight coefficient, x i The concentration value of the target gas in the gas sample, n is the type of target gas in the gas sample, 1≤i≤n.

[0022] Furthermore, the gas collection module includes a gas collecting pipe having an air inlet pipeline and an air outlet pipeline. The air inlet pipeline extends into the interior of the gas collecting pipe, and transports the gas to be monitored to the sampling port of each gas monitoring sub-unit through a plurality of first branch pipelines. The air outlet pipeline is provided with a second branch pipeline connected to the gas exhaust port of each gas monitoring sub-unit, so as to collect the gas flowing out of the gas exhaust port through the air outlet pipeline and then discharge it.

[0023] Furthermore, the first branch pipeline is provided with a siloxane filter unit and a tubular humidity regulating unit; the siloxane filter unit comprises silica gel loaded with organic sulfonic acid and a gas selective permeable membrane, and the gas selective permeable membrane only allows gas molecules with a molecular radius smaller than that of siloxane to pass through.

[0024] Furthermore, the organic sulfonic acid is any one of naphthalenesulfonic acid and p-toluenesulfonic acid, and the specific surface area of ​​the silica gel is 580 m 2 / g~720m 2 / g, pore volume 1.0cm 3 / g~1.1cm 3 / g.

[0025] Furthermore, the tubular humidity regulating unit is made of a polymer material with water selective permeability, which can permeate water vapor to the outside of the tubular humidity regulating unit under the condition that the water vapor partial pressure inside the tubular humidity regulating unit is greater than the water vapor partial pressure in the box environment.

[0026] Furthermore, the malodorous gas online monitoring system is also provided with an alarm module, which includes a second display unit and a buzzer alarm unit, and the second display unit displays the real-time malodorous gas concentration value.

[0027] Furthermore, the data processing and storage module stores a preset upper concentration threshold of the malodorous gas. After the data processing and storage module obtains the real-time malodorous gas concentration value, the real-time malodorous gas concentration value is compared with the preset upper concentration threshold of the malodorous gas; when the real-time malodorous gas concentration value is greater than or equal to the preset upper concentration threshold of the malodorous gas, the buzzer alarm unit is triggered to alarm; otherwise, the buzzer alarm unit is not triggered.

[0028] Compared with the prior art, the present invention can bring at least one of the following beneficial effects:

[0029] 1. The malodorous gas online monitoring system of the present invention has good stability. The siloxane filtration unit includes silica gel loaded with organic sulfonic acid and a gas selective permeable membrane, which enhances the siloxane filtration effect and can prevent siloxane from contacting the gas sensor and causing poisoning of the metal oxide semiconductor gas sensor; in addition, the tubular humidity adjustment unit can prevent the humidity of the gas sample to be monitored from being too high, thereby ensuring the working performance and service life of the gas sensor. The malodorous gas online monitoring system weakens the impact caused by changes in environmental temperature and humidity, and does not require the addition of a complex auxiliary temperature and humidity control system.

[0030] 2. The array formed by the plurality of gas monitoring sub-units of the present invention can not only detect different types of target gases in the monitored gas sample, with the concentration value of each target gas displayed by the first display unit, but also transmit the concentration value of each target gas to the data processing and storage module of the malodorous gas online monitoring system through the data sending unit, and obtain the malodorous gas concentration value of the gas sample through the fitting formula processing, thereby forming a collaborative relationship among the plurality of gas monitoring sub-units, and the malodorous gas concentration value of the output gas sample has high accuracy.

[0031] 3. The number of gas monitoring subunits of the malodorous gas online monitoring system of the present invention can be increased, decreased or replaced according to the type of target gas to be monitored, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and their implementation methods.

[0033] Figure 1 Schematic diagram of an online monitoring system for malodorous gases in one embodiment of the present invention; DETAILED DESCRIPTION

[0034] Various aspects of the present invention are described in further detail below.

[0035] Unless otherwise defined or indicated, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the method of the present invention.

[0036] Unless otherwise clearly specified and limited, the "or" mentioned in the present invention includes the relationship of "and". The "and" is equivalent to the Boolean logic operator "AND", the "or" is equivalent to the Boolean logic operator "OR", and "AND" is a subset of "OR".

[0037] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, the first element may be referred to as the second element without departing from the teachings of the present invention.

[0038] In the present invention, the terms "consisting mainly of" and "consisting of" are included in the terms "containing", "including" or "comprising".

[0039] Unless otherwise clearly specified and limited, the terms "connected", "connected" and "connection" in the present invention should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] For example, if an element (or component) is referred to as being on, coupled to, or connected to another element, the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intervening elements between them. In contrast, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, then no intervening elements are indicated. Other words used to describe the relationship between elements should be similarly interpreted, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," and the like.

[0041] It should also be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The words "inner" and "outer" used refer to directions toward or away from the geometric center of a particular component, respectively. It can be understood that these terms are used here to describe the relationship of one element, layer or region relative to another element, layer or region as shown in the drawings. In addition to the orientations described in the drawings, these terms should also include other orientations of the device.

[0042] Other aspects of the present invention will be apparent to those skilled in the art in view of the disclosure herein.

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0044] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation may be changed arbitrarily, and the component layout may also be more complicated. For example, the thickness of the components in the drawings may be exaggerated for the sake of clarity.

[0045] Example 1

[0046] As attached Figure 1 As shown, the present invention realizes an online monitoring system for malodorous gas, and the system comprises: a gas monitoring module 1, a gas collecting module 2, a data processing and storage module 3, a communication module 4 and a power supply module 5 arranged in a box;

[0047] The gas monitoring module 1 is used to monitor the concentration of malodorous gases in real time;

[0048] The gas collecting module 2 is in gas communication with the gas monitoring module 1, and is used to supply the gas sample to be monitored to the gas monitoring module 1;

[0049] The data processing and storage module 3 is in communication with the gas monitoring module 1, and is used to process the real-time gas monitoring data, obtain the real-time malodorous gas concentration value, and store the malodorous gas concentration value;

[0050] The communication module 4 is in communication connection with the data processing and storage module 3, and is used to send the processed malodorous gas concentration value to a remote computer;

[0051] The power supply module 5 is electrically connected to the gas monitoring module 1 , the data processing and storage module 3 , and the communication module 4 , and is used to provide a DC voltage to the above modules.

[0052] As a preferred embodiment, the communication module 4 is not limited to wireless communication methods such as infrared technology, WiFi, Bluetooth, Zigbee, Z-wave, NB-loT, GPRS, 5G, LTE, SigFox, LoRaWAN, etc.

[0053] As a preferred embodiment, in an example scenario, the gas monitoring module 1 includes three gas monitoring subunits 110, which are respectively used for monitoring different target gases. Each of the gas monitoring subunits 110 includes a gas sensor unit 11, a data processing unit 12, a data sending unit 13, a first display unit 14 and an outer shell. The gas sensor unit 11, the data processing unit 12, the data sending unit 13, and the first display unit 14 are accommodated in the outer shell. The outer shell is provided with a gas inlet 17 and a gas outlet 18. The gas to be monitored entering from the gas inlet is discharged from the gas outlet 18 after being detected by the gas sensor unit 11. The data sending unit 13 transmits data in a wired or wireless manner.

[0054] In this embodiment, the target gas types monitored by the three gas monitoring sub-units 110 are hydrogen sulfide gas, ammonia gas, and TVOC (Total Volatile Organic Compounds).

[0055] It is understandable that in different scenarios, the types of target gases to be monitored will also be different. The listed scenarios include: chemical plants, sewage treatment plants, sewage pumping stations, waste incineration plants, livestock and poultry farms, etc. The gas monitoring subunit 110 of this embodiment is an assemblable modular design, which can be assembled into a linear or matrix array. The gas monitoring subunit 110 can be adaptively increased or decreased according to the increase or decrease in the types of target gases being monitored to complete the monitoring of all target gases in different scenarios.

[0056] It is understandable that the data transmission unit 13 uses wired or wireless methods for data transmission. Wired data transmission methods include: ETH, M-BUS, PLC, USB, RS-485, RS-232; wireless data transmission methods include: infrared technology, WiFi, Bluetooth, Zigbee, Z-wave, NB-loT, GPRS, 5G, LTE, SigFox, LoRaWAN.

[0057] In this embodiment, the data processing unit 12 in each of the gas monitoring sub-units 110 is communicatively connected with the gas sensor unit 11. The gas sensor units 11 in the three gas monitoring sub-units 110 transmit the monitoring data to the data processing unit 12. The concentration values ​​of hydrogen sulfide gas, ammonia gas, and TVOC in the gas sample are obtained through processing by the data processing unit 12. The first display unit 14 in the three gas monitoring sub-units 110 displays the concentration value of the corresponding target gas to facilitate direct visual reading by technicians.

[0058] It is understandable that the type of the gas sensor unit 11 can be set to any one of a metal oxide semiconductor gas sensor, a potential electrolysis sensor, a contact combustion gas sensor, and an electrochemical gas sensor. Preferably, in some scenarios, the gas sensor units 11 in each of the gas monitoring subunits 110 can be set to the same type of sensor; in other scenarios, the gas sensor units 11 in each of the gas monitoring subunits 110 can be set to different types. For the scenario in which the target gas types in the example are hydrogen sulfide gas, ammonia gas, and TVOC, two gas sensor units are potential electrolysis sensors for monitoring hydrogen sulfide gas and ammonia gas; one of the gas sensor units is a metal oxide semiconductor gas sensor for monitoring TVOC.

[0059] In this embodiment, the concentration value of the target gas in the gas sample monitored by each of the gas monitoring sub-units 110 is sent to the data processing and storage module 3 of the malodorous gas online monitoring system via the corresponding data sending unit 13 .

[0060] In this embodiment, the data processing and storage module 3 of the malodorous gas online monitoring system substitutes the concentration value of the target gas in the gas sample monitored by each of the gas monitoring subunits 110 into the fitting formula for processing to obtain the odor concentration value of the gas sample. The fitting formula is as follows:

[0061]

[0062] Among them, A is the concentration value of the odorous gas in the gas sample, a i is the weight coefficient, x i The monitored concentration values ​​of the target gases in the gas sample, wherein the target gases are hydrogen sulfide, ammonia and TVOC, and n is the type of the target gas in the gas sample, where n is 3.

[0063] It is understandable that in different scenarios, there will be a set of different weight coefficients corresponding to the target gas components in the scenario, and the fitting formula containing the weight coefficients can be obtained by linear regression based on the discrete point group obtained by manual olfactory identification. At this time, it is only necessary to substitute the target gas concentration value detected in different usage scenarios into the fitting formula to obtain the malodorous gas concentration value of the corresponding gas sample, and send the processed malodorous gas concentration value to the remote computer through the communication module 4, so that the PLC can determine whether to take measures to remove the malodorous gas.

[0064] As a preferred embodiment, the gas collection module includes a gas collecting pipe 22 having an air inlet pipeline 20 and an air outlet pipeline 21, the air inlet pipeline 20 extends into the interior of the gas collecting pipe, and the gas to be monitored is transported to the sampling port 17 of each gas monitoring sub-unit through a plurality of first branch pipelines, and the air outlet pipeline is provided with a second branch pipeline connected to the gas exhaust port 18 of each gas monitoring sub-unit, which is used to collect the gas flowing out of the gas exhaust port through the air outlet pipeline 21 and then discharge it.

[0065] As a preferred embodiment, a siloxane filtration unit 16 and a tubular humidity adjustment unit 15 are provided on the first branch pipeline; the siloxane filtration unit 16 includes silica gel loaded with organic sulfonic acid and a gas selective permeable membrane, and the gas selective permeable membrane only allows gas molecules with a molecular radius smaller than that of siloxane to pass through.

[0066] In this embodiment, the silica gel in the siloxane filtering unit 16 carries not only organic sulfonic acid but also Lewis acid compound. The inventors unexpectedly found that the silica gel carrying organic sulfonic acid and Lewis acid compound exhibits stronger siloxane adsorption characteristics.

[0067] As a preferred embodiment, the organic sulfonic acid is any one of naphthalenesulfonic acid and p-toluenesulfonic acid, and the specific surface area of ​​the silica gel is 580 m 2 / g~720m 2 / g, pore volume 1.0cm 3 / g~1.1cm 3 / g, and the organic sulfonic acid does not have a molecular radius that blocks the pores of silica gel, and therefore does not hinder the diffusion of siloxane into the pores and is adsorbed and held on the pore surface of silica gel.

[0068] As a preferred embodiment, the tubular humidity regulating unit 15 is composed of a polymer material with water selective permeability. The polymer material with water selective permeability can permeate water vapor to the outside of the tubular humidity regulating unit under the condition that the water vapor partial pressure inside the tubular humidity regulating unit is greater than the water vapor partial pressure in the box environment, thereby adjusting the gas sample to be monitored to a humidity suitable for the operation of the gas sensor.

[0069] As a preferred embodiment, the malodorous gas online monitoring system is further provided with an alarm module 6, which includes a second display unit and a buzzer alarm unit. The second display unit displays the real-time malodorous gas concentration value to facilitate visual collection by technicians.

[0070] As a preferred embodiment, a preset upper concentration threshold of malodorous gas is stored in the data processing and storage module 3. After the data processing and storage module 3 obtains the real-time malodorous gas concentration value, the real-time malodorous gas concentration value is compared with the preset upper concentration threshold of the malodorous gas; when the real-time malodorous gas concentration value is greater than or equal to the preset upper concentration threshold of the malodorous gas, the buzzer alarm unit is triggered to alarm; otherwise, the buzzer alarm unit is not triggered.

[0071] Based on this application, it should be understood by those skilled in the art that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0072] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

[0073] All documents mentioned in the present invention are cited as references in this application, just as each document is cited as reference separately. In addition, it should be understood that after reading the above content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. An online monitoring system for malodorous gases, characterized in that: The system comprises: a gas monitoring module, a gas collection module, a data processing and storage module, a communication module and a power supply module arranged in a box; The gas monitoring module is used to monitor the concentration of malodorous gases in real time; The gas collection module is in gas communication with the gas monitoring module, and is used to supply the gas sample to be monitored to the gas monitoring module; The data processing and storage module is in communication with the gas monitoring module, and is used to process the real-time gas monitoring data, obtain the real-time malodorous gas concentration value, and store the malodorous gas concentration value; The communication module is in communication connection with the data processing and storage module, and is used to send the processed malodorous gas concentration value to a remote computer; The power supply module is electrically connected to the gas monitoring module, the data processing and storage module, and the communication module, and is used to provide a DC voltage to the above modules.

2. The malodorous gas online monitoring system according to claim 1, characterized in that: The gas monitoring module includes a plurality of gas monitoring sub-units. Each of the gas monitoring sub-units monitors a different type of target gas, and the gas monitoring sub-units can be increased or decreased according to the type of the target gas to be monitored.

3. The malodorous gas online monitoring system according to claim 2, characterized in that: Each of the gas monitoring subunits comprises a gas sensor unit, a data processing unit, a data sending unit, a first display unit and an outer shell. The gas sensor unit, the data processing unit, the data sending unit and the first display unit are accommodated in the outer shell. The outer shell is provided with a gas inlet and a gas exhaust port. The gas to be monitored entering from the gas inlet is detected by the gas sensor unit and then discharged from the gas exhaust port.

4. The malodorous gas online monitoring system according to claim 3, characterized in that: The data processing unit in each of the gas monitoring subunits is in communication with the gas sensor unit to process and generate a concentration value of the target gas in the gas sample monitored by the gas monitoring subunit, and the first display unit displays the concentration value of the target gas.

5. The malodorous gas online monitoring system according to claim 2 or 3, characterized in that: The gas sensor unit is any one of a metal oxide semiconductor gas sensor, a potential electrolysis sensor, a contact combustion gas sensor, and an electrochemical gas sensor.

6. The malodorous gas online monitoring system according to claim 4, characterized in that: The concentration value of the target gas in the gas sample monitored by each of the gas monitoring sub-units is sent to the data processing and storage module of the malodorous gas online monitoring system via the corresponding data sending unit.

7. The malodorous gas online monitoring system according to claim 6, characterized in that: The data processing and storage module of the malodorous gas online monitoring system substitutes the concentration value of the target gas in the gas sample monitored by each gas monitoring subunit into the fitting formula for processing to obtain the odor concentration value of the gas sample. The processing formula is as follows: Among them, A is the concentration value of the odorous gas in the gas sample, a i is the weight coefficient, x i The concentration value of the target gas in the gas sample, n is the type of target gas in the gas sample, 1≤i≤n.

8. The malodorous gas online monitoring system according to any one of claims 1 to 4, characterized in that: The gas collection module includes a gas collection pipe having an air inlet pipeline and an air outlet pipeline. The air inlet pipeline extends into the interior of the gas collection pipe, and the gas to be monitored is transported to the sampling port of each gas monitoring sub-unit through a plurality of first branch pipelines. The air outlet pipeline is provided with a second branch pipeline connected to the gas exhaust port of each gas monitoring sub-unit, so as to collect the gas flowing out of the gas exhaust port through the air outlet pipeline and then discharge it.

9. The malodorous gas online monitoring system according to claim 8, characterized in that: The first branch pipeline is provided with a siloxane filter unit and a tubular humidity regulating unit; the siloxane filter unit comprises silica gel loaded with organic sulfonic acid and a gas selective permeable membrane, and the gas selective permeable membrane only allows gas molecules with a molecular radius smaller than that of siloxane to pass through.

10. The malodorous gas online monitoring system according to claim 9, characterized in that: The organic sulfonic acid is any one of naphthalenesulfonic acid and p-toluenesulfonic acid, and the specific surface area of ​​the silica gel is 580 m 2 / g~720m 2 / g, pore volume 1.0cm 3 / g~1.1cm 3 / g.

11. The malodorous gas online monitoring system according to claim 9 or 10, characterized in that: The tubular humidity regulating unit is made of a polymer material with water selective permeability, which can permeate water vapor to the outside of the tubular humidity regulating unit under the condition that the water vapor partial pressure inside the tubular humidity regulating unit is greater than the water vapor partial pressure in the box environment.

12. The malodorous gas online monitoring system according to any one of claims 1 to 4, characterized in that: The malodorous gas online monitoring system is also provided with an alarm module, which includes a second display unit and a buzzer alarm unit, and the second display unit displays the real-time malodorous gas concentration value.

13. The malodorous gas online monitoring system according to any one of claims 1 to 4, characterized in that: The data processing and storage module stores a preset upper concentration threshold of malodorous gas. After the data processing and storage module obtains a real-time malodorous gas concentration value, the real-time malodorous gas concentration value is compared with the preset upper concentration threshold of the malodorous gas. When the real-time malodorous gas concentration value is greater than or equal to the preset upper concentration threshold of the malodorous gas, the buzzer alarm unit is triggered to alarm; otherwise, the buzzer alarm unit is not triggered.

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