Pollution source odor online smelly distinguishing and monitoring instrument

Abstract

The utility model discloses an online smelly distinguishing and monitoring instrument for a pollution source odor. The online smelly distinguishing and monitoring instrument comprises an odorless air generating device, a gas collecting channel, an online smelly distinguishing monitor and a smelly distinguishing nose mask, wherein the online sniffing monitor is provided with a double-channel high-precision mass flow meter and a secondary gas mixing device, the instrument can realize six control gas paths through a central control system and some electric valve groups, and has the functions of cleaning, sampling, gas mixing, back flushing, flow calibration and the like, and the dynamic gas distribution and sniffing implementation process of the instrument accord with the standard principle, so that the online sniffing monitor can be widely applied to the field of medical instruments. The method has the characteristics of real-time performance, high efficiency, rapidness and the like, is reliable in performance, and is beneficial to solving numerous pains and difficulties in current odor pollution management.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection, and particularly relates to an on-line olfactory discrimination monitoring instrument for odor of pollution sources. Background Art

[0002] In recent years, with the increasing requirements of the people for the quality of the ecological environment, environmental disputes caused by odor nuisance have gradually increased. For a long time, there has been a lack of an intuitive and effective method to judge whether the waste gas discharged from factories is smelly, to what extent it is smelly, and whether it meets its legal emission standards. The current monitoring method for odor concentration is mainly based on the "Determination of Odor in Ambient Air and Exhaust Gas - Three - point Comparison Olfactometry Bag Method" (HJ 1262 - 2022). When using artificial olfactory discrimination of odors, when the management department disposes of environmental odor - related petitions, if it is necessary to monitor the reported pollution source, generally the following steps are required: reporting → on - site sampling → sample delivery → artificial gas preparation → artificial olfactory discrimination → report → reply. Such a process often takes at least one week. This high - cost and low - efficiency monitoring method can no longer meet the needs of handling odor - related petitions in the new era.

[0003] For odor - emitting enterprises, there is also a lack of effective means to judge the odor concentration emission situation during daily pollution source emission management. Although existing monitoring means such as VOCs and odor electronic noses can also characterize the emission situation of odor - related gases to a certain extent, on the one hand, such monitoring means are costly and unaffordable for general enterprises. On the other hand, the correlation between the indicators of such on - line monitoring and the odor concentration emission standards still needs to be further studied, and the current actual application scenarios are few. The complexity of odor indicators and the timeliness of odor emissions make it difficult for environmental protection departments to obtain evidence, enforce the law, and for polluting enterprises to manage. Summary of the Invention

[0004] The purpose of the utility model is to address the deficiencies of the above - mentioned existing technologies and provide an on - line monitoring system for odor of pollution sources that meets the current emission standards, is real - time, efficient, fast, and cost - effective, so as to solve many difficulties and pain points in current odor management.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An on - line olfactory discrimination monitoring instrument for odor of pollution sources, which includes an odorless air generating device, a gas collection channel, an on - line olfactory discrimination monitor, and an olfactory discrimination nose mask. The odorless air generating device includes an oil - free silent air compressor and an air multi - stage purifier. The outlet of the oil - free silent air compressor is connected to the inlet of the air multi - stage purifier through a pipeline. The gas collection channel includes a sampling gun, a gas filter element, and a sample transmission pipe. The inlet of the sampling gun is connected to the exhaust pipe, the outlet of the sampling gun is connected to the inlet of the gas filter element, and the outlet of the gas filter element is connected to the inlet of the sample transmission pipe.

[0007] The on-line olfactory discrimination monitor includes a sample gas inlet, a sample gas tank cleaning port, an odorless air inlet, a sample olfactory discrimination port, a flow calibration port I, a flow calibration port II, a sample gas tank, a central control system, a Venturi mixer, and a cyclone mixer. The outlet of the sample transfer pipe is connected to one end of the sample gas inlet. The other end of the sample gas inlet is sequentially connected to the inlet of the sample gas tank through a sampling pump and a solenoid valve I. The first outlet of the sample gas tank is connected to the sample gas tank cleaning port through a solenoid valve II. The third outlet of the sample gas tank is connected to the inlet of a mass flowmeter II through a solenoid valve V. The outlet of the mass flowmeter II is connected to the inlet of an electromagnetic three-way valve II. The first outlet of the electromagnetic three-way valve II is connected to the flow calibration port II. The second outlet of the electromagnetic three-way valve II is connected to the first inlet of the Venturi mixer. The outlet of the air multi-stage purifier is connected to one end of the odorless air inlet. The other end of the odorless air inlet is connected to the inlet of a mass flowmeter I through a solenoid valve IV. The outlet of the mass flowmeter I is connected to the inlet of an electromagnetic three-way valve I. The first outlet of the electromagnetic three-way valve I is connected to the flow calibration port I. The second outlet of the electromagnetic three-way valve I is connected to the second inlet of the Venturi mixer. The outlet of the Venturi mixer is connected to the inlet of the cyclone mixer. The outlet of the cyclone mixer is connected to one end of the sample olfactory discrimination port. The other end of the sample olfactory discrimination port is connected to an olfactory discrimination nose mask. The other end of the odorless air inlet is connected to the second outlet of the sample gas tank through a solenoid valve III between the solenoid valve IV;

[0008] The sampling pump, solenoid valve I, solenoid valve II, solenoid valve III, solenoid valve IV, solenoid valve V, electromagnetic three-way valve I, electromagnetic three-way valve II, mass flowmeter I, and mass flowmeter II are all connected to the central control system through lines. The central control system is connected to a touch display screen set outside the on-line olfactory discrimination monitor through a line.

[0009] Preferably, the oil-free silent air compressor includes a compressed air tank and a secondary pressure reducing output device, and the secondary pressure reducing output device is installed on the compressed air tank.

[0010] Preferably, the air multi-stage purifier includes a drying filter and an activated carbon odor filter.

[0011] Preferably, the sampling tube is made of stainless steel or titanium alloy.

[0012] Preferably, the sample transfer pipe is made of polytetrafluoroethylene.

[0013] Preferably, a sample gas tank heating device is wound around the outer wall of the sample gas tank. An electronic pressure gauge is provided on the sample gas tank. The sample gas tank heating device and the electronic pressure gauge are both connected to the central control system through lines.

[0014] Preferably, the main body part of the olfactory discrimination nose mask is made of hard plastic, while the part that fits the user's face is made of soft silicone.

[0015] The beneficial effects of the present utility model are as follows:

[0016] (1) The present utility model adopts the random multiple sniffing method. The whole sniffing process includes 1 time of sniffing and dynamically diluting the waste gas and more than 2 times of sniffing odorless air. The sniffing order is randomly determined by the instrument, which can effectively avoid misjudging the exceeding standard situation;

[0017] (2) The present utility model has a perfect pipeline cleaning and backwashing function, which can effectively avoid cross-interference caused by sample residue and avoid interference between different analysis rounds;

[0018] (3) The dynamic dilution component of the present utility model has an independent flow calibration channel, and the dynamic dilution multiple has good traceability;

[0019] (4) The present utility model has the characteristics of being real-time, efficient, and fast, etc. It can solve many difficulties and pain points in the current management of malodorous pollution sources in environmental protection, and the production, use, and maintenance costs are relatively low, which has the value of popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the present utility model;

[0021] Figure 2 is a structural schematic diagram of the on-line sniffing monitor in the present utility model;

[0022] In the figure: 1. Odorless air generating device; 2. Gas collection channel; 3. On-line sniffing monitor; 4. Sniffing nose mask; 31. Sample gas inlet; 32. Sample gas tank cleaning port; 33. Odorless air inlet; 34. Sample sniffing port; 35. Flow calibration port I; 36. Flow calibration port II; 101. Oil-free silent air compressor; 102. Air multi-stage purifier; 201. Sampling gun; 202. Gas filter element; 203. Sample transmission pipe; 301. Central control system; 302. Sampling pump; 303. Solenoid valve I; 304. Solenoid valve II; 305. Solenoid valve III; 306. Solenoid valve IV; 307. Solenoid valve V; 308. Electromagnetic three-way valve I; 309. Electromagnetic three-way valve II; 310. Sample gas tank heating device; 311. Electronic pressure gauge; 312. Mass flowmeter I; 313. Mass flowmeter II; 314. Touch display screen; 315. Sample gas tank; 316. Venturi mixer; 317. Cyclone mixer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below with reference to the accompanying drawings:

[0024] As Figure 1-2As shown in the figure, an on-line odor discrimination and monitoring instrument for pollution source odor of the present utility model includes an odorless air generating device 1, a gas collection channel 2, an on-line odor discrimination monitor 3 and an odor discrimination nose mask 4. The on-line odor discrimination monitor 3 has a standard cabinet structure. There are a sample gas inlet 31, a sample gas tank cleaning port 32 and an odorless air inlet 33 on the back of the instrument, and a sample odor discrimination port 34, a flow calibration port I 35 and a flow calibration port II 36 on the front of the instrument, which are convenient for daily operation and calibration. The sample gas inlet 31 is connected to a sample transmission pipe, the sample gas tank cleaning port 32 is connected to an exhaust pipe to discharge waste gas outdoors, the odorless air inlet 33 is connected to the odorless air generating device 1, and the sample odor discrimination port 34 is connected to the odor discrimination nose mask 4.

[0025] The odorless air generating device 1 in the present utility model includes an oil-free silent air compressor 101 and an air multi-stage purifier 102. The outlet of the oil-free silent air compressor 101 is connected to the inlet of the air multi-stage purifier 102 through a pipeline. The oil-free silent air compressor 101 includes a compressed air tank and a secondary decompression output device. The secondary decompression output device is installed on the compressed air tank. The outlet flow of the oil-free silent air compressor 101 is greater than 60 L / min. The air multi-stage purifier 102 includes a drying filter and an activated carbon odor filter, and the compressed air becomes odorless air after filtration.

[0026] The gas collection channel 2 in the present utility model includes a sampling gun 201, a gas filter element 202 and a sample transmission pipe 203. The inlet of the sampling gun 201 is connected to an exhaust stack, the outlet of the sampling gun 201 is connected to the inlet of the gas filter element 202, and the outlet of the gas filter element 202 is connected to the inlet of the sample transmission pipe 203. Among them, the sampling pipe 201 is made of stainless steel or titanium alloy and has corrosion resistance. The main function of the gas filter element 202 is to filter the particulate components in the flue gas and needs to be replaced regularly to ensure the filtering effect. The sample transmission pipe 203 is made of tetrafluoroethylene.

[0027] The on-line odor discrimination monitor 3 in the present utility model includes a sample gas inlet 31, a sample gas tank cleaning port 32, an odorless air inlet 33, a sample odor discrimination port 34, a flow calibration port I 35, a flow calibration port II 36, a sample gas tank 315, a central control system 301, a Venturi mixer 316 and a cyclone mixer 317;

[0028] The outlet of the sample transmission pipe 203 is connected to one end of the sample gas inlet 31. The other end of the sample gas inlet 31 is sequentially connected to the sample gas tank 315 through a sampling pump 302 and a solenoid valve I 303. The first outlet of the sample gas tank 315 is connected to the sample gas tank cleaning port 32 through a solenoid valve II 304.

[0029] The third outlet of the sample gas tank 315 is connected to the inlet of the mass flowmeter II 313 through the solenoid valve V 307. The outlet of the mass flowmeter II 313 is connected to the inlet of the electromagnetic three-way valve II 309. The first outlet of the electromagnetic three-way valve II 309 is connected to the flow calibration port II 36. The second outlet of the electromagnetic three-way valve II 309 is connected to the first inlet of the Venturi mixer 316.

[0030] The outlet of the air multi-stage purifier 102 is connected to one end of the odorless air inlet 33. The other end of the odorless air inlet 33 is connected to the inlet of the mass flowmeter I 312 through the solenoid valve IV 306. The outlet of the mass flowmeter I 312 is connected to the inlet of the electromagnetic three-way valve I 308. The first outlet of the electromagnetic three-way valve I 308 is connected to the flow calibration port I 35. The second outlet of the electromagnetic three-way valve I 308 is connected to the second inlet of the Venturi mixer 316. The dual-channel mass flowmeter in the online olfactory discrimination monitor 3 has two flow ranges, large and small. Among them, the mass flowmeter I 312 is a large-flow mass flowmeter, with a maximum up to 30 L / min, and the mass flowmeter II 313 is a small-flow mass flowmeter, with a minimum accuracy of 1 ml / min. The maximum online dynamic dilution ratio of the instrument can reach 30,000 times, and different specifications of large and small flowmeters can be selected according to different emission standards.

[0031] In the present utility model, the outlet of the Venturi mixer 316 is connected to the inlet of the cyclone mixer 317. The outlet of the cyclone mixer 317 is connected to one end of the sample olfactory discrimination port 34. The other end of the sample olfactory discrimination port 34 is connected to the olfactory discrimination nose mask 4. Between the other end of the odorless air inlet 33 and the solenoid valve IV 306, it is connected to the second outlet of the sample gas tank 315 through the solenoid valve III 305.

[0032] In the present utility model, the sampling pump 302, solenoid valve I 303, solenoid valve II 304, solenoid valve III 305, solenoid valve IV 306, solenoid valve V 307, electromagnetic three-way valve I 308, electromagnetic three-way valve II 309, mass flowmeter I 312 and mass flowmeter II 313 are all connected to the central control system 301 through wires and are controlled by it. The central control system 301 is connected to the touch display screen 314 arranged outside the online olfactory discrimination monitor 3 through wires, and the instrument is set and operated through the touch display screen 314.

[0033] The online olfactory discrimination monitor 3 in the present utility model includes at least six control air paths, which are respectively:

[0034] The first pre - cleaning gas path for the sample gas tank: Open solenoid valve Ⅰ303 and solenoid valve Ⅱ304. The sample gas tank 315 is in the venting mode. Open the sampling pump 302. The waste gas from the pollution source enters through the gas collection channel 2 into the sample gas inlet 31, and then passes through the sampling pump 302 and solenoid valve Ⅰ303 and enters the sample gas tank 315. After a short stay in the tank, it is discharged from the sample gas tank cleaning port 32 through solenoid valve Ⅱ304. Run a complete pre - cleaning cycle of the gas tank according to the set time to clean the sample gas tank 315 with the sample gas before sampling, and then close all solenoid valves and the sampling pump.

[0035] The second sample gas collection gas path: Open solenoid valve Ⅰ303 and the sampling pump 302. The waste gas from the pollution source enters through the gas collection channel 2 into the sample gas inlet 31, and then passes through the sampling pump 302 and solenoid valve Ⅰ303 and enters the sample gas tank 315 until the pressure in the tank reaches the control output pressure value of the electronic pressure gauge 311. Then close solenoid valve Ⅰ303 and the sampling pump 302 to complete the sample collection process;

[0036] The third sample gas dynamic dilution gas path: Preset the dilution multiple of the instrument according to the given odor concentration emission standard. The central control system 301 automatically sets the flow values of mass flowmeter Ⅰ312 and mass flowmeter Ⅱ313. Open the inlet and outlet channels of solenoid valve Ⅳ306 and electromagnetic three - way valve Ⅰ308, and at the same time open the inlet and outlet channels of solenoid valve Ⅴ307 and electromagnetic three - way valve Ⅱ309. The odorless air flows out from mass flowmeter Ⅰ312 at the set flow rate, and the sample gas collected in the sample gas tank 315 flows out from mass flowmeter Ⅱ313 at the set flow rate. The two gases are mixed in the Venturi mixer 316 and then further mixed evenly through the cyclone mixer 317 and discharged through the sample odor discrimination port 34.

[0037] The fourth blank odor discrimination gas path: Open the inlet and outlet channels of solenoid valve Ⅳ306 and electromagnetic three - way valve Ⅰ308. The flow rate setting of mass flowmeter Ⅰ312 is the same as that of the dynamic dilution gas path. The pure odorless air passes through the Venturi mixer 316 and the cyclone mixer 317 respectively and is discharged at the sample odor discrimination port 34.

[0038] Article 5 Post - cleaning gas path of the sample gas cylinder: Open solenoid valve II 304. The remaining waste gas sample in the sample gas cylinder 315 passes through solenoid valve II 304 and is discharged from the sample gas cylinder cleaning port 32. After the pressure of the sample gas cylinder returns to atmospheric pressure, turn on the electric heating device 310 of the sample gas cylinder. The sample gas cylinder 315 is heated to the preset temperature. The difficult - to - volatilize components attached to the inner surface of the sample gas cylinder 315 are volatilized by heat. Open solenoid valve III 305. Odorless air is blown into the sample gas cylinder 315 through solenoid valve III 305 and is discharged from the sample gas cylinder cleaning port 32 through solenoid valve II 304. Run a complete post - cleaning cycle according to the instrument - set time to effectively remove the influence of the residual waste gas in the sample gas cylinder 315 on the next monitoring. Then close all solenoid valves and turn off the electric heating device 310 of the sample gas cylinder.

[0039] Article 6 Flowmeter calibration gas path: Open solenoid valve III 305, solenoid valve IV 306, and solenoid valve V 307. Open the flow calibration channels of electromagnetic three - way valve I 308 and electromagnetic three - way valve II 309. Turn on mass flowmeter I 312 and mass flowmeter II 313. Preset the flow values of the two channels. Odorless air is discharged through flow calibration port I 35 and flow calibration port II 36 according to the preset flow rates. Connect a flow calibrator to flow calibration port I 35 and flow calibration port II 36 to calibrate the flow values of the two channels.

[0040] In the present utility model, a sample gas cylinder heating device 310 is wound around the outer wall of the sample gas cylinder 315. An electronic pressure gauge 311 is provided on the sample gas cylinder 315. Both the sample gas cylinder heating device 310 and the electronic pressure gauge 311 are connected to the central control system 301 through wires.

[0041] In the present utility model, the intake air duct diameter of the olfactory discrimination nose mask 4 should be adapted to large - flow gas input. The intake air duct is located in the center of the nose mask, with gas overflow holes on both sides. The main body part of the olfactory discrimination nose mask 4 is made of hard plastic, while the part in contact with the user's face is made of soft silicone, which is easy to disassemble and clean.

[0042] The usage process of the present utility model is as follows:

[0043] The first step: The olfactory discrimination personnel select the olfactory discrimination mode on the touch - control screen 314, set parameters such as the dynamic dilution multiple, gas cylinder cleaning time, and number of olfactory discrimination executions, and input the current olfactory discriminator.

[0044] The second step is the sample collection stage: Click sample collection on the touch - control screen 314. The instrument first executes the sample gas cylinder cleaning program, opens the pre - cleaning gas path of the sample gas cylinder, rinses the sample gas cylinder 315 with the current waste gas sample. After the cleaning time reaches the set target, close the pre - cleaning gas path of the sample gas cylinder, open the sample gas collection gas path, and the waste gas from the pollution source continuously fills the sample gas cylinder 315 until the electronic pressure gauge 311 reaches the pressure set point, then close the sample gas collection gas path.

[0045] The third step is the smelling and discrimination stage: Click "Start Smelling and Discrimination". The instrument randomly sets the rounds of smelling and discrimination for odorless air samples and mixed gas samples during this monitoring process according to the set number of smelling and discrimination times. Taking the three-point smelling and discrimination as an example, a complete smelling and discrimination operation requires a total of three rounds of smelling and discrimination, one of which is a mixed gas sample and two are odorless air samples. If the instrument randomly arranges the smelling and discrimination rounds as odorless air, mixed gas, and odorless air, start the first round of smelling and discrimination. The instrument turns on the blank smelling air path. After stabilizing the flow rate, it issues the first smelling and discrimination instruction on the screen. The on-site smelling and discrimination personnel put on the smelling mask 4, distinguish whether there is an odor, and select the discrimination result on the touch control screen 314; after the result of the first round is input, start the second round of smelling and discrimination. The instrument switches to the sample gas dynamic dilution air path. The sample gas and odorless air flow into the two-stage mixer according to the set ratio respectively. After reaching the stable time, the touch control screen 314 issues the second smelling and discrimination instruction. The on-site smelling and discrimination personnel put on the smelling mask 4, distinguish whether there is an odor, and select the discrimination result on the screen; after the result of the second round is input, start the third round of smelling and discrimination. The instrument turns on the blank smelling air path. After stabilizing the flow rate, it issues the first smelling and discrimination instruction on the touch control screen 314. The on-site smelling and discrimination personnel put on the smelling mask 4, distinguish whether there is an odor, and select the discrimination result on the touch control screen 314.

[0046] The fourth step is result judgment: When the judgment results of all three rounds of smelling and discrimination are odorless, the touch control screen 314 prompts that the odor concentration meets the standard; when in the three rounds of smelling and discrimination, the results of the two blank rounds are both odorless, while the smelling and discrimination result of the sample mixed gas round is odor, the screen prompts that the odor concentration exceeds the standard; when in the three rounds of smelling and discrimination, at least one of the two blank rounds is identified as having an odor, the screen prompts that the smelling and discrimination fails and needs to be re-performed. The central control system 301 of the instrument automatically records the implementation time, the person performing the smelling and discrimination, and the smelling and discrimination results each time.

[0047] The fifth step is the cleaning stage: After the smelling and discrimination is completed, select automatic cleaning. The instrument switches to the sample gas tank 315 and then cleans the air path, automatically empties the waste gas in the sample gas tank 315, turns on the electric heating device 310 of the sample gas tank 315 to the preset temperature. The difficult-to-volatilize components attached to the inner surface of the sample gas tank 315 are volatilized by heat. Odorless air starts to backflush to wash out both the residual waste gas and the heat-volatilized difficult-to-volatilize components from the sample gas tank 315, continuing until the set time to complete the entire flushing process.

[0048] Other parts not described in this utility model are the same as the prior art.

Claims

1. An on-line olfactory discrimination monitoring instrument for odor from pollution sources, characterized in that It includes an odorless air generating device (1), a gas collection channel (2), an on-line olfactometry monitor (3) and an olfactometry nose mask (4). The odorless air generating device (1) includes an oil-free silent air compressor (101) and an air multi-stage purifier (102). The outlet of the oil-free silent air compressor (101) is connected to the inlet of the air multi-stage purifier (102) through a pipeline. The gas collection channel (2) includes a sampling gun (201), a gas filter element (202) and a sample transfer pipe (203). The inlet of the sampling gun (201) is connected to an exhaust stack. The outlet of the sampling gun (201) is connected to the inlet of the gas filter element (202). The outlet of the gas filter element (202) is connected to the inlet of the sample transfer pipe (203).The on-line olfactory discrimination monitor (3) includes a sample gas inlet (31), a sample gas tank cleaning port (32), an odorless air inlet (33), a sample olfactory discrimination port (34), a flow calibration port I (35), a flow calibration port II (36), a sample gas tank (315), a central control system (301), a Venturi mixer (316) and a cyclone mixer (317). The outlet of the sample transfer pipe (203) is connected to one end of the sample gas inlet (31). The other end of the sample gas inlet (31) is sequentially connected to the inlet of the sample gas tank (315) through a sampling pump (302) and a solenoid valve I (303). The first outlet of the sample gas tank (315) is connected to the sample gas tank cleaning port (32) through a solenoid valve II (304). The third outlet of the sample gas tank (315) is connected to the inlet of a mass flowmeter II (313) through a solenoid valve V (307). The outlet of the mass flowmeter II (313) is connected to the inlet of an electromagnetic three-way valve II (309). The first outlet of the electromagnetic three-way valve II (309) is connected to the flow calibration port II (36). The second outlet of the electromagnetic three-way valve II (309) is connected to the first inlet of the Venturi mixer (316). The outlet of the air multi-stage purifier (102) is connected to one end of the odorless air inlet (33). The other end of the odorless air inlet (33) is connected to the inlet of a mass flowmeter I (312) through a solenoid valve IV (306). The outlet of the mass flowmeter I (312) is connected to the inlet of an electromagnetic three-way valve I (308). The first outlet of the electromagnetic three-way valve I (308) is connected to the flow calibration port I (35). The second outlet of the electromagnetic three-way valve I (308) is connected to the second inlet of the Venturi mixer (316). The outlet of the Venturi mixer (316) is connected to the inlet of the cyclone mixer (317). The outlet of the cyclone mixer (317) is connected to one end of the sample olfactory discrimination port (34). The other end of the sample olfactory discrimination port (34) is connected to the olfactory discrimination nose mask (4). A solenoid valve III (305) is connected between the other end of the odorless air inlet (33) and the solenoid valve IV (306) and the second outlet of the sample gas tank (315); The sampling pump (302), solenoid valve I (303), solenoid valve II (304), solenoid valve III (305), solenoid valve IV (306), solenoid valve V (307), electromagnetic three-way valve I (308), electromagnetic three-way valve II (309), mass flowmeter I (312) and mass flowmeter II (313) are all connected to the central control system (301) through wires, and the central control system (301) is connected to a touch display screen (314) arranged outside the on-line olfactometry monitor (3) through wires.

2. The on-line olfactory discrimination monitoring instrument for odor from pollution sources according to claim 1, characterized in that The oil-free silent air compressor (101) includes a compressed air tank and a secondary decompression output device, and the secondary decompression output device is installed on the compressed air tank.

3. The on-line odor discrimination and monitoring instrument for odor from pollution sources according to claim 1, characterized in that The air multi-stage purifier (102) includes a drying filter and an activated carbon odor filter.

4. The on-line olfactory discrimination monitoring instrument for odor from pollution sources according to claim 1, characterized in that The sampling gun (201) is made of stainless steel or titanium alloy.

5. The on-line olfactory discrimination monitoring instrument for odor from pollution sources according to claim 1, characterized in that The sample transfer tube (203) is made of polytetrafluoroethylene.

6. The on-line olfactory discrimination monitoring instrument for odor from pollution sources according to claim 1, characterized in that A sample gas tank heating device (310) is wound around the outer wall of the sample gas tank (315), an electronic pressure gauge (311) is provided on the sample gas tank (315), and both the sample gas tank heating device (310) and the electronic pressure gauge (311) are connected to the central control system (301) through wires.

7. The on-line olfactory discrimination monitoring instrument for odor of pollution sources according to claim 1, characterized in that The main body of the olfactometry nose mask (4) is made of hard plastic, while the part that fits the user's face is made of soft silicone.

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