Flue gas emission continuous monitoring system

Abstract

The utility model relates to the field of flue gas monitoring systems, in particular to a flue gas emission continuous monitoring system. Comprising a pipeline, a pipeline connector, a supporting column, a sensor, a spiral shaft, a dust removal device, a tail gas treatment box and a main machine cabinet, the sensor is detachably arranged on the pipeline, and the spiral shaft is arranged in a cooling pipeline and used for increasing gas passing paths, slowing down the gas flowing rate and cooling detected gas; the dust removal device settles dust in detected gas by spraying a water curtain to achieve a dust removal effect, the tail gas treatment box is filled with treatment liquid and is used for removing polluted gas in flue gas, the host cabinet comprises a screen and an alarm system, specific monitoring data are displayed on the screen, and when pollutants of discharged gas exceed a set threshold value, the alarm system is used for alarming the detected gas. And the alarm system gives an alarm. The tail gas treatment device has the beneficial effects of efficiently removing dust, monitoring and treating pollutants in tail gas, realizing an over-standard alarm function, and being convenient to maintain and high in expansibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flue gas monitoring system, concretely relates to a flue gas emission continuous monitoring system. BACKGROUND

[0002] The current flue gas emission continuous monitoring device is a kind of equipment for real-time monitoring of pollutant concentration and flow in industrial chimney or flue gas emission source, and its main function is to monitor and record data on-line for the flue gas of industrial emission source, to ensure that the emission meets environmental protection regulations and standards.

[0003] The flue gas emission continuous monitoring device in prior art needs to adopt inlet pipe to communicate with flue gas emission end during continuous monitoring process, so that flue gas is continuously introduced into monitoring device, and continuous monitoring is realized by combining analyzer and sensor, however, dust and particles in flue gas are relatively large, and temperature is relatively high when being introduced, after a period of time, the impact of flue gas on sensor sensing end and the adhesion of dust particles on sensor sensing end will make monitoring data drift, and even damage sensor.

[0004] Through retrieval, it is found that the utility model patent with authorized announcement number CN220913092U discloses a flue gas emission continuous monitoring device, which comprises a monitoring box, an analyzer and a sensor, the analyzer and the sensor are fixedly installed in the interior of the monitoring box, the interior of the monitoring box is provided with a connecting disc, the top surface of the connecting disc is fixedly connected with a cleaning brush, the bottom of the monitoring box is fixedly connected with a connecting seat, the top part of the connecting seat is respectively provided with a motor and an electric push rod, by starting two groups of motors, the motor drives the sleeve to rotate through the intermediate rod, and then the connecting disc drives the top cleaning brush to rotate, the electric push rod is started, the electric push rod drives the push plate to move upwards, so that the push plate drives the sleeve to rotate and move upwards, so that the connecting disc and the cleaning brush move upwards synchronously, the cleaning brush rotates and contacts the lower end of the analyzer and the sensor, and cleaning is completed.

[0005] However, the following problems still exist:

[0006] Dust cleaning is not complete, when the brush is full of dust, continuous work will damage the sensor, air blowing is used to reduce temperature effect, which is uneven, and will affect the data of measured flue gas, and lack of multi-pollutant treatment capacity. UTILITY MODEL CONTENT

[0007] The utility model provides a kind of flue gas emission continuous monitoring system to solve the deficiency existing in prior art, including pipeline, pipeline joint and support column, the pipeline includes flow pipeline, detection pipeline, cooling pipeline, circulating pipeline, the flow pipeline is used to flow measured flue gas, the detection pipeline is used to detect measured flue gas, the cooling pipeline is used to cool measured flue gas, the circulating pipeline is used to circulate dust removal liquid;The pipeline joint includes direct head and elbow joint, the pipeline joint is located between two pipelines, for connecting and fixing pipeline, the pipeline joint is interference fit between pipeline, the elbow joint is used to change the direction of connecting pipeline, one end of the support column is located at the lower end of pipeline joint in left and right ends, and the other end is fixed on ground.

[0008] Further, it further includes spiral shaft, the spiral shaft is located in cooling pipeline, and is interference fit with pipeline, for increasing gas passing path, slowing down gas flow rate, cooling measured gas.

[0009] Further, it further includes dust removal device, the dust removal device includes dust removal kettle, dust collection box, square porous filter plate, circular porous filter plate, water pump, spray head, the dust removal kettle is connected with the flow pipeline, the dust collection box is located below the dust removal kettle, the square porous filter plate is located in dust collection box, the circular porous filter plate is located in the outlet pipeline of the dust removal kettle, one end of the water pump is fixedly arranged on the fixed seat on the upper end of dust collection box, and the other end is arranged in circulating pipeline, the water pump extracts liquid in dust collection box to the spray head in circulating pipeline, the spray head is located at the top of dust removal kettle, and the spray head sprays water curtain to form water film on the side wall of dust removal kettle to make dust in measured gas settle in dust collection box.

[0010] Further, the dust collection box is provided with an access hole, including an access door, a buckle and a hinge, the access hole is used for cleaning dust and replacing porous filter plate, the access door is provided with a handle and connected with the dust collection box through the hinge, and the access door can be rotated around the hinge, the buckle is rotated around shaft to lock the handle and lock the access hole.

[0011] Further, the circular porous filter plate and the square porous filter plate are at least two layers.

[0012] Further, the dust removal kettle is spherical.

[0013] Further, the inner wall of the lower end of the dust removal kettle is provided with a groove to increase the contact area of the water film.

[0014] Further, the sensor is detachably arranged on the pipeline, one end of the sensor is arranged in the pipeline through the suspension of the sidewall of the pipeline, and the other end is arranged above the pipeline and connected with the cable, the sensor comprises a temperature sensor, a humidity sensor, an oxygen sensor, a flow rate sensor, a nitrogen oxide sensor, a sulfur oxide sensor and a carbon monoxide sensor, the temperature sensor is arranged in the first detection pipeline in front of the spiral shaft, the humidity sensor is arranged in the second detection pipeline in front of the dust removal kettle, the oxygen sensor, the flow rate sensor, the nitrogen oxide sensor, the sulfur oxide sensor and the carbon monoxide sensor are arranged in the third detection pipeline after the dust removal kettle and before the tail gas treatment box, and the nitrogen oxide sensor, the sulfur oxide sensor and the carbon monoxide sensor are further arranged in the fourth detection pipeline after the tail gas treatment box, and an alarm threshold is arranged for monitoring the pollutants in the exhaust gas.

[0015] Further, the main cabinet comprises a power supply, a PCB circuit board and a display screen, the power supply is connected with the PCB circuit board and the water pump through the cable for power supply, the sensor is connected with the PCB circuit board through the cable, the PCB circuit board is connected with the display screen, the PCB circuit board is used for receiving and analyzing the detection data of the sensor and displaying on the display screen, an alarm device is arranged on the main cabinet, the alarm device comprises an alarm lamp and a buzzer, the alarm lamp is arranged on the upper end of the main cabinet, and the buzzer is arranged on the two sides of the main cabinet in an axisymmetric mode, when the pollutants in the measured gas detected by the sensor exceed the set threshold, the alarm lamp flashes, and the buzzer emits a prompt sound.

[0016] Further, the tail gas treatment box is arranged, and the tail gas treatment box stores treatment liquid for removing the polluted gas in the flue gas.

[0017] The utility model discloses reached the beneficial effects are as follows:

[0018] 1, the utility model discloses a spiral shaft increases the gas flow path, slows down the gas flow rate, reduces the gas temperature, realizes uniform cooling and avoids the effect that the airflow causes the impact to the sensor.

[0019] 2, the utility model discloses that the high pressure shower head sprays the water curtain and forms the water film on the spherical dust removal kettle inner wall, realizes the settlement, adsorption of the dust in the flue gas, and filters through the porous filter plate in the pipeline, realizes the effect of complete dust removal. The mixture of dust removal liquid and dust is filtered and separated through the porous filter plate of the dust collection plate, and the dust removal liquid is recycled by the water pump.

[0020] 3, the utility model discloses that the tail gas treatment box is arranged, and the sensor secondary monitoring is arranged after the tail gas treatment box, and the alarm threshold is set, so that the discharged gas meets the environmental protection regulations and standards. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the overall structure schematic view of the utility model.

[0022] Figure 2 It is the plan view of the utility model.

[0023] Figure 3 It is the utility model Figure 2 A-A section view in.

[0024] Figure 4 It is the spiral shaft schematic view of the utility model.

[0025] Figure 5 It is the dust removal device structure schematic view of the utility model.

[0026] Figure 6 It is the rear view of the utility model Figure 5 .

[0027] Figure 7 It is the B-B section view in the utility model Figure 5 .

[0028] Figure 8 It is the dust removal device Figure 5 D local enlarged view in.

[0029] Figure 9 It is the main cabinet structure schematic view of the utility model.

[0030] Figure 10 It is the C-C section view in the utility model Figure 9 .

[0031] In the drawing, 1, detection pipeline;1001, first detection pipeline;1002, second detection pipeline;1003, third detection pipeline;1004, fourth detection pipeline;2, cooling pipeline;3, flow pipeline;4, direct head;5, elbow joint;6, support column;7, sensor;8, dust removal device;9, tail gas treatment box;10, main cabinet;11, cable;12, spiral shaft;71, temperature sensor;72, humidity sensor;73, oxygen sensor;74, flow rate sensor;75, nitrogen oxide sensor;76, sulfur oxide sensor;77, carbon monoxide sensor;81, dust removal kettle;82, bowl;83, dust collection box;84, access hole;85, circulating pipeline;86, water pump;87, fixed seat;88, spray head;811, recess;89, square porous filter plate;891, circular porous filter plate;841, hinge;842, access door;843, handle;844, buckle;101, power cabinet;102, buzzer;103, alarm lamp;104, display screen;105, PCB circuit board;106, power supply. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application by those skilled in the art, the specific embodiments of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be pointed out that the terms "upper end", "lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] As shown in Figures 1 to 10 The present application provides a kind of flue gas emission continuous monitoring system, including pipeline, the pipeline includes flow pipeline 3, detection pipeline 1, cooling pipeline 2 and circulation pipeline 85, the flow pipeline 3 is used to flow the measured flue gas, the detection pipeline 1 is used to detect measured flue gas, the cooling pipeline 2 is used to cool measured flue gas, the circulation pipeline 85 is used to circulate dust removal liquid;Pipe joint, including direct head 4 and elbow joint 5, the pipe joint is located between two pipelines, for connecting and fixing pipeline, the pipe joint and the pipeline between interference fit, the elbow joint 5 is used to change the direction of connecting the pipeline;Support column 6, one end of the support column 6 is located at the lower end of the pipe joint, the other end is fixed on the ground, the support column 6 is used to support pipeline;Spiral shaft 12, the spiral shaft 12 is located in cooling pipeline 2, with the cooling pipeline 2 interference fit, for slowing down gas flow rate and cooling measured gas;Dust removal device 8, the dust removal device 8 is located in the flow pipeline 3 and the detection pipeline 1 intermediate, for removing dust in measured flue gas.

[0036] Specifically, as shown in Figures 5 to 8 Specifically, the dust removal device 8 includes a dust removal kettle 81, a dust collection box 83, a square porous filter plate 89, a circular porous filter plate 891, a water pump 86 and a spray head 88, the dust removal kettle 81 is connected with the flow pipeline 3, the dust collection box 83 is arranged below the dust removal kettle 81, the square porous filter plate 89 is arranged in the dust collection box 83, the circular porous filter plate 891 is arranged in the outlet pipeline of the dust removal kettle 81, one end of the water pump 86 is fixedly arranged on the fixed seat 87 at the upper end of the dust collection box 83, the other end is arranged in the circulating pipeline 85, the water pump 86 draws the liquid in the dust collection box 83 to the spray head 88 through the circulating pipeline 85, the spray head 88 is arranged at the top of the dust removal kettle 81, and the spray head 88 sprays a water curtain to form a water film on the side wall of the dust removal kettle 81.

[0037] Specifically, the dust particles in the measured flue gas contact the water film and then settle in the dust collection box.

[0038] Specifically, as shown in Figure 5 Specifically, the dust collection box 83 is provided with an access hole 84, including an access door 842, a buckle 844 and a hinge 841, the access hole 84 is used for cleaning accumulated dust and replacing the square porous filter plate 89, the access door 842 is provided with a handle 843 and is connected with the dust collection box 83 through the hinge 841, the access door 842 can rotate around the hinge 841, and the buckle 844 rotates around the shaft and is used for clamping the handle 843 to lock the access door 842.

[0039] Specifically, the circular porous filter plate 891 and the square porous filter plate 89 are at least two layers, so as to ensure that the measured flue gas after filtration does not contain dust and achieve the effect of thorough dust removal.

[0040] Specifically, the circular porous filter plate 891 and the square porous filter plate 89 need to be replaced regularly, and the recommended replacement period is 30 days to 90 days, because the first layer of accumulated dust is more than the second layer, when replacing, the first layer of filter plate is taken out, the second layer of filter plate is replaced to the first layer, and the new filter plate is placed in the second layer, so as to save cost.

[0041] Specifically, the dust removal kettle 81 is spherical, so as to avoid dead angle of the water curtain sprayed by the spray head 88.

[0042] Specifically, the inner wall of the lower end of the dust removal kettle 81 is provided with a groove 811 for increasing the contact area of the water film.

[0043] Specifically, the groove 811 is at least two.

[0044] Specifically, the dust removal liquid should be selected from a solution which is not easy to react with the components to be monitored in the measured gas, such as polyethylene glycol solution, and the dust removal liquid is circulated by the water pump 86, so as to save cost.

[0045] Specifically, the dust removal liquid is updated periodically, and the recommended update cycle is 120 to 180 days.

[0046] Specifically, the sensor 7 is detachably arranged on the pipeline, one end of the sensor 7 penetrates through the side wall of the pipeline and is suspended in the middle of the pipeline, and the other end of the sensor 7 is arranged above the pipeline and connected with the cable 11.

[0047] Specifically, the sensor 7 includes a temperature sensor 71, a humidity sensor 72, an oxygen sensor 73, a flow rate sensor 74, a nitrogen oxide sensor 75, a sulfur oxide sensor 76, and a carbon monoxide sensor 77. The temperature sensor 71 is arranged in a first detection pipeline 1001 in front of the spiral shaft 12. The humidity sensor 72 is arranged in a second detection pipeline 1002 in front of the dust removal kettle 81. The oxygen sensor 73, the flow rate sensor 74, the nitrogen oxide sensor 75, the sulfur oxide sensor 76, and the carbon monoxide sensor 77 are arranged in a third detection pipeline 1003 behind the dust removal kettle 81 and in front of the tail gas treatment box 9. The nitrogen oxide sensor 75, the sulfur oxide sensor 76, and the carbon monoxide sensor 77 are also arranged in a fourth detection pipeline 1004 behind the tail gas treatment box 9, and an alarm threshold is set for monitoring pollutants in the exhaust gas.

[0048] Specifically, the pollutants in the tail gas, such as common carbon monoxide (CO), sulfur dioxide (SO2), nitrogen dioxide (NO2), and inhalable particulate matter (PM2.5), are monitored by corresponding sensors in the fourth monitoring pipeline 1004, such as nitrogen oxide sensor 75 for monitoring nitrogen dioxide (NO2), sulfur oxide sensor 76 for monitoring sulfur dioxide (SO2), carbon monoxide sensor 77 for monitoring carbon monoxide (CO), and dust sensor for monitoring PM2.5.

[0049] Specifically, the use of sensors can be selected, replaced, increased or reduced according to the actual composition of flue gas and monitoring requirements.

[0050] Specifically, when the number of sensors needs to be reduced, a sealing plug should be used to plug the sensor mounting hole on the monitoring pipeline to ensure the sealing of the monitoring pipeline and prevent the measured flue gas from escaping.

[0051] Specifically, the main cabinet 10 is further provided with an alarm device, the alarm device includes an alarm lamp 103 and a buzzer 102, the alarm lamp 103 is arranged on the upper end of the main cabinet 10, and the buzzer 102 is arranged on both sides of the main cabinet 10 in an axisymmetric manner. When the pollutants in the measured gas detected by the sensor exceed the set threshold, the alarm device flashes and the buzzer 102 emits a prompt sound.

[0052] Specifically, taking carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NO x ) and inhalable particles (PM2.5) as examples, according to the current national standard for comprehensive emission of atmospheric pollutants in boilers (GB13271-2014), the recommended alarm threshold is: carbon monoxide (CO) is 3mg / m 3 ; sulfur dioxide (SO2) is 400mg / m 3 ; nitrogen oxides (NO x ) is 400mg / m 3 ; inhalable particles (PM2.5) is 60mg / m 3 , according to the standards implemented in different regions and the composition of the monitored flue gas, the actual situation is adjusted accordingly.

[0053] Specifically, the number of the tail gas treatment box 9 is determined according to the type and quantity of the pollution gas in the actual measured flue gas that needs to be treated, and the treatment liquid in the tail gas treatment box 9 is determined according to the type of the pollution gas in the actual measured flue gas.

[0054] Specifically, taking the mixed gas of carbon monoxide (CO), sulfur dioxide (SO2) and nitrogen oxides (NO x ) as an example, the tail gas treatment liquid is recommended to be sodium hydroxide (NaOH) solution with a catalyst, and the catalyst is recommended to be manganese dioxide (MnO2) catalyst, which is used to catalyze carbon monoxide (CO) into carbon dioxide (CO2) so as to be fully absorbed by sodium hydroxide (NaOH) solution.

[0055] In use, the chimney is connected to the air inlet, the flue gas enters the first detection pipeline 1001, the temperature of the gas is detected by the temperature sensor 71, then the measured flue gas passes through the spiral channel separated by the spiral shaft 12 in the cooling pipeline, so that the measured gas is cooled and slowed down, thereby avoiding the impact on the subsequent sensor, then the measured flue gas passes through the second detection pipeline 1002, the humidity is detected by the humidity sensor 72, then the measured gas enters the dust removal kettle 81, the dust in the measured flue gas is adsorbed and settled by the water curtain sprayed by the spray head 88 in the dust removal kettle and the water film formed on the side wall of the dust removal kettle 81, the mixture of dust and dust removal liquid enters the dust removal tank, and is separated through two layers of square porous filter plates 89, the dust removal liquid enters the third layer of the dust removal tank and is pumped to the spray head for recycling, the gas is filtered through the circular porous filter plate 891 of the dust removal kettle outlet pipeline, so that the dust removal effect is further ensured, then the gas enters the third detection pipeline 1003, the oxygen content, flow rate and other pollutants of the gas are detected, then the gas enters the tail gas treatment tank 9 to remove the polluted gas, then enters the fourth detection pipeline 1004, and whether the measured flue gas after treatment meets the emission standard is detected, the alarm threshold of the sensor in the fourth detection pipeline is set, when the pollutants in the measured flue gas exceed the standard, the alarm lamp 103 on the host cabinet 10 flashes, and the buzzer 102 emits sound, prompting the technical personnel to replace the treatment liquid in the tail gas treatment tank 9. The number of pipelines, the number and types of sensors, the number of tail gas treatment tanks and the types of tail gas treatment liquids in the embodiment can be selected or increased or decreased according to the composition of the measured flue gas and actual needs.

[0056] The utility model discloses, not described part is prior art or well-known technology.

[0057] The above-mentioned embodiments of the utility model do not constitute the limitation to the protection scope of the utility model. Any modification, equivalent replacement and improvement etc. in the spirit and principle of the utility model should be included in the protection scope of the claims of the utility model.

[0058] The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A continuous emission monitoring system for flue gas, characterized in that: include: The pipeline includes a flow pipeline (3), a detection pipeline (1), a cooling pipeline (2) and a circulation pipeline (85). The flow pipeline (3) is used to flow the flue gas to be tested, the detection pipeline (1) is used to detect the flue gas to be tested, the cooling pipeline (2) is used to cool the flue gas to be tested, and the circulation pipeline (85) is used to circulate the dust removal liquid. The pipe joint includes a straight joint (4) and an elbow joint (5). The pipe joint is located between two pipes and is used to connect and fix the pipes. The pipe joint and the pipes are interference fit. The elbow joint (5) is used to change the direction of the connection of the pipes. Support column (6), one end of the support column (6) is located at the lower end of the pipe joint, and the other end is fixed on the ground. The support column (6) is used to support the pipe. The spiral shaft (12) is located inside the cooling pipe (2) and is interference-fitted with the cooling pipe (2) to slow down the gas flow rate and cool the gas being tested; A dust removal device (8) is located between the flow pipe (3) and the detection pipe (1) and is used to remove dust from the flue gas being tested.

2. The continuous emission monitoring system for flue gas according to claim 1, characterized in that: The dust removal device (8) includes a dust collector (81), a dust collection box (83), a square porous filter plate (89), a circular porous filter plate (891), a water pump (86), and a nozzle (88). The dust collector (81) is connected to the flow pipe (3). The dust collection box (83) is located below the dust collector (81). The square porous filter plate (89) is located inside the dust collection box (83). The circular porous filter plate (891) is located in the dust collector. Inside the outlet pipe of the vessel (81), one end of the water pump (86) is fixed on the fixed seat (87) at the upper end of the dust collection box (83), and the other end is located in the circulation pipe (85). The water pump (86) draws the liquid in the dust collection box (83) through the circulation pipe (85) to the nozzle (88). The nozzle (88) is located at the top of the dust removal vessel (81), and the nozzle (88) sprays out a water curtain to form a water film on the side wall of the dust removal vessel (81).

3. The continuous emission monitoring system for flue gas according to claim 2, characterized in that: The dust collection box (83) is provided with an inspection port (84), including an inspection door (842), a buckle (844) and a hinge (841). The inspection port (84) is used to clean the accumulated dust and replace the square porous filter plate (89). The inspection door (842) is provided with a handle (843) and is connected to the dust collection box (83) through the hinge (841). The inspection door (842) can rotate around the hinge (841). The buckle (844) rotates around the axis and is used to lock the handle (843) and lock the inspection door (842).

4. The continuous emission monitoring system for flue gas according to claim 2, characterized in that: The circular porous filter plate (891) and the square porous filter plate (89) are at least two layers.

5. The continuous emission monitoring system for flue gas according to claim 2, characterized in that: The dust collector (81) is spherical.

6. The continuous emission monitoring system for flue gas according to claim 2, characterized in that: The dust collector (81) has a groove (811) on the inner wall at the lower end to increase the contact area of ​​the water film.

7. The continuous emission monitoring system for flue gas according to claim 2, characterized in that: It also includes a sensor (7), which is detachably mounted on the pipe. One end of the sensor (7) passes through the side wall of the pipe and is suspended in the middle of the pipe. The other end is located above the pipe and connected to a cable (11). The sensor (7) includes a temperature sensor (71), a humidity sensor (72), an oxygen sensor (73), a flow rate sensor (74), a nitrogen oxide sensor (75), a sulfur oxide sensor (76), and a carbon monoxide sensor (77). The temperature sensor (71) is located in the first detection pipe (1001) before the spiral shaft (12), and the humidity sensor (72) is located in the... In the second detection pipeline (1002) before the dust collector (81), the oxygen sensor (73), flow rate sensor (74), nitrogen oxide sensor (75), sulfur oxide sensor (76) and carbon monoxide sensor (77) are located in the third detection pipeline (1003) after the dust collector (81) and before the exhaust gas treatment box (9). The nitrogen oxide sensor (75), sulfur oxide sensor (76) and carbon monoxide sensor (77) are also located in the fourth detection pipeline (1004) after the exhaust gas treatment box (9), and alarm thresholds are set to monitor pollutants in the exhaust gas.

8. The continuous emission monitoring system for flue gas according to claim 1, characterized in that: It also includes a main unit cabinet (10), including a power supply (106), a PCB circuit board (105) and a display screen (104). The power supply (106) is connected to the PCB circuit board (105) and the water pump (86) via a cable (11) for power supply. The sensor (7) is connected to the PCB circuit board (105) via the cable (11). The PCB circuit board (105) is connected to the display screen (104). The PCB circuit board (105) is used to receive and analyze the detection data of the sensor (7) and display it on the display screen (104). The main unit cabinet (10) is equipped with an alarm device, which includes an alarm light (103) and a buzzer (102). The alarm light (103) is located at the top of the main unit cabinet (10), and the buzzer (102) is symmetrically located on both sides of the main unit cabinet (10). When the pollutants in the gas detected by the sensor exceed the set threshold, the alarm light (103) flashes and the buzzer (102) emits a warning sound.

9. The continuous emission monitoring system for flue gas according to claim 1, characterized in that: It also includes an exhaust gas treatment box (9), which contains exhaust gas treatment liquid for removing polluting gases from flue gas.

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