Flue gas analysis device and flue gas emission system

Abstract

The utility model discloses a flue gas analysis device and a flue gas emission system, and belongs to the technical field of environmental protection. The flue gas emission system comprises a flue and a flue gas analysis device, and the flue gas analysis device comprises an analyzer and a dust removal mechanism. The analyzer comprises an analyzer body and a sampling pipe, a gas inlet of the analyzer body is communicated with the sampling pipe, and the sampling pipe is provided with a sampling end which is far away from the analyzer body and is used for being inserted into a flue; the dust removal mechanism comprises a metal filter pipe, a blowback device and a blowing pipe, a containing cavity is formed in the metal filter pipe, the sampling end is located in the containing cavity, and a gap is formed between the outer wall of the sampling end and the inner wall of the metal filter pipe so as to filter flue gas pumped to the sampling end; and the blowback device is selectively communicated with the gap of the accommodating chamber through a blowing pipe so as to blow clean gas to the accommodating chamber to blow away smoke outside the metal filter pipe. And the metal filter pipe is connected with the flue. The flue gas analysis device can be used for detecting and analyzing the flue gas in the flue under the high-temperature and high-dust working condition.

Description

Technical Field

[0001] This application relates to the field of environmental protection technologies, and more particularly, to a flue gas analysis device and a flue gas emission system. Background Art

[0002] Current on-line flue gas detection instruments (CEMS) mostly analyze flue gas by extracting it. The flue gas sampling and collection device installed on the flue duct extracts the flue gas to the gas chamber of the analysis instrument through a jet pump, and then detects the content of various flue gas components by optical analysis methods. Existing flue gas sampling and collection devices are generally installed at the flue gas outlet. The dust in the flue gas has been filtered by a dust removal device, and the dust concentration is generally ≤ 10 mg / Nm 3 .

[0003] With the continuous improvement of environmental protection requirements, deadlines for implementing ultra-low emission targets have been successively proposed in various places. According to the ultra-low emission requirements: NO x ≤ 50 mg / Nm 3 , SO 2 ≤ 35 mg / Nm 3 , PM ≤ 10 mg / Nm 3 , existing industrial enterprises need to carry out corresponding renovations on existing environmental protection facilities, and at the same time put forward higher requirements for the control of environmental protection facilities. With the implementation of ultra-low emission standards, environmental protection facilities such as desulfurization and denitrification need to achieve more timely and accurate control. The dosage of desulfurization and denitrification agents needs to be calculated according to the preset formula by detecting data such as the concentration of flue gas components at the inlet and outlet of the environmental protection device, flue gas flow rate, and temperature, and then PID adjustment is performed by comparing the set data with the actual data, and finally the emission standard is achieved. Therefore, it is imperative to install a flue gas analysis instrument at the inlet of the environmental protection facility.

[0004] However, at the inlet end of the environmental protection facility, due to high-temperature and high-dust working conditions (for example: the flue gas temperature at the C1 port of the cement kiln tail: 300 - 340 °C, dust concentration: 80 - 100 g / Nm 3 ; the flue gas temperature at the economizer outlet of the heating boiler: 350 - 400 °C, dust concentration: 30 - 40 g / Nm 3 ), existing flue gas analysis instruments cannot adapt to high-dust working conditions, the flue gas sampling and collection pipes are easily blocked, continuous and stable data cannot be provided, and the instrument maintenance workload is large. Summary of the Utility Model

[0005] Based on the above deficiencies, this application provides a flue gas analysis device and a flue gas emission system to improve the problem of flue gas analysis and detection under high-temperature and high-dust working conditions in related technologies.

[0006] This application is implemented as follows:

[0007] In a first aspect, an example of the present application provides a flue gas analysis device, including an analyzer and a dust removal mechanism. The analyzer includes an analyzer body and a sampling pipe. The air inlet of the analyzer body is communicated with the sampling pipe. The sampling pipe has a sampling end for inserting into the flue, which is far away from the analyzer body. The dust removal mechanism includes a metal filter tube, a back blower, and a blowing pipe. The inside of the metal filter tube has an accommodation chamber. The sampling end is located in the accommodation chamber, and there is a gap between the outer wall of the sampling end and the inner wall of the metal filter tube to filter the flue gas pumped to the sampling end. The back blower is selectively communicated with the gap of the accommodation chamber through the blowing pipe to blow clean gas into the gap to remove the soot outside the metal filter tube.

[0008] In the above implementation process, the sampling end of the sampling pipe is located in the accommodation chamber of the metal filter tube. The metal filter tube can filter the flue gas, so that the filtered flue gas penetrates into the accommodation chamber and then flows into the sampling pipe, and is transported by the sampling pipe into the analyzer body for flue gas analysis. Since the metal filter tube covers the outside of the sampling pipe and filters the flue gas, it can reduce the probability of the soot in the flue gas blocking the sampling pipe and the analyzer body. The metal filter tube covers the outside of the sampling pipe, which is convenient for directly cleaning the metal filter tube. Moreover, there is a gap between the outer wall of the sampling end and the inner wall of the metal filter tube. The back blower in the dust removal mechanism is communicated with the gap of the accommodation chamber through the blowing pipe. Clean gas can be blown into the gap through the back blower to remove the soot attached to the metal filter tube, reducing the maintenance workload of the flue gas analysis device.

[0009] In combination with the first aspect, in an optional implementation manner, the dust removal mechanism includes a connecting pipe, which is sleeved outside the sampling pipe. The first end of the connecting pipe is hermetically connected to the analyzer body, and the second end of the connecting pipe is detachably hermetically connected to the metal filter tube. The blowing pipe is communicated with the connecting pipe.

[0010] In the above implementation process, the sampling pipe is sleeved inside the connecting pipe. The two ends of the connecting pipe are respectively hermetically connected to the analyzer body and the metal filter tube. The back blower is communicated with the connecting pipe through the blowing pipe. When the back blower blows air, the clean gas blown out by the back blower can flow into the connecting pipe from the blowing pipe, and then flow into the metal filter tube from the connecting pipe to remove the soot at the metal filter tube. During the removal process, the clean gas will not enter the sampling pipe, which can reduce the influence of the clean gas on the flue gas components in the sampling pipe.

[0011] In combination with the first aspect, in an optional implementation manner, the second end of the connecting pipe is provided with a first connecting ring, and the end of the metal filter tube is provided with a flanging piece, and the flanging piece is fixedly and hermetically connected to the first connecting ring.

[0012] In the above implementation process, a first connection ring is provided at the second end of the connecting pipe, and a flanging piece is provided at the end of the metal filter pipe. The first connection ring can be hermetically connected to the flanging piece, so that the clean gas in the connecting pipe can flow into the gap of the accommodation chamber of the metal filter pipe.

[0013] Combined with the first aspect, in an optional implementation manner, the first connection ring is provided with a connection hole, and a fixing member is inserted through the connection hole. The fixing member is used to be fixed on the second connection ring at the end of the flue, so that the first connection ring and the second connection ring clamp the flanging piece.

[0014] In the above implementation process, when it is necessary to analyze the flue gas in the flue by using the flue gas analysis device, the first connection ring of the connecting pipe is connected to the flanging piece of the metal filter pipe and is also connected to the second connection ring at the end of the flue, so that the metal filter pipe and the sampling end extend into the flue. The flue gas in the flue can flow into the sampling pipe after being filtered by the metal filter pipe and then flow into the analyzer body through the sampling pipe for flue gas analysis.

[0015] Combined with the first aspect, in an optional implementation manner, the analyzer body includes a CEMS cabinet and a sampler. The sampling pipe is connected to the air inlet of the sampler, and the sampler is connected to the CEMS cabinet through a tracing pipe.

[0016] In the above implementation process, during flue gas analysis, the sampling pipe transports the flue gas into the sampler, and the flue gas in the sampler is transported to the CEMS cabinet through the tracing pipe at the sampler. The CEMS cabinet analyzes the flue gas to obtain the analysis and detection results.

[0017] Combined with the first aspect, in an optional implementation manner, the blowpipe is provided with a pulse valve, and the backblower is an air receiver. The air inlet of the pulse valve is connected to the air receiver.

[0018] In the above implementation process, a pulse valve is provided at the blowpipe, and the air inlet of the pulse valve is connected to the air receiver. When it is necessary to backblow clean gas to the metal filter pipe, the pulse valve can be used to open the air receiver to release the compressed clean gas stored in the air receiver, so that the clean gas can flow into the metal filter pipe.

[0019] Combined with the first aspect, in an optional implementation manner, the pulse valve is signal-connected to the CEMS cabinet. After the CEMS cabinet operates for a set time, it sends a signal to the pulse valve, and the pulse valve releases the clean gas stored in the air receiver.

[0020] In the above implementation process, by signal-connecting the pulse valve to the CEMS cabinet, the CEMS cabinet can be used to send a signal to the pulse valve after operating for a set time, so that the pulse valve releases the clean gas stored in the air receiver to automatically remove dust from the metal filter pipe.

[0021] In a second aspect, an embodiment of the present application provides a flue gas emission system, including a flue and the flue gas analysis device provided in the first aspect, with the sampling end inserted into the flue.

[0022] In the above implementation process, by arranging a flue gas analysis device in the flue gas emission system and inserting the sampling end and the metal filter tube in the flue gas analysis device into the flue, the flue gas analysis device can be used to extract the flue gas in the flue, so that the flue gas flows into the sampling tube after being filtered by the metal filter tube, reducing the probability of the sampling tube or the flue gas analyzer being blocked by soot in the flue gas. The metal filter tube is arranged outside the sampling tube, and the soot attached to the outside of the metal filter tube can be directly removed. Moreover, the dust removal mechanism in the flue gas analysis device can transport clean gas to the gap in the accommodation chamber of the metal filter tube, automatically blowing off the soot attached to the metal filter tube, improving the flue gas analysis efficiency and reducing the maintenance workload of the system.

[0023] Combined with the second aspect, in an alternative embodiment, the flue has a flue gas inlet and a flue gas outlet, and sampling ends are inserted into both the flue gas inlet and the flue gas outlet.

[0024] In the above implementation process, flue gas analysis devices are arranged at both the flue gas inlet and the flue gas outlet of the flue, which can detect the flue gas at the flue gas inlet and the flue gas outlet online, so as to adjust the flue gas treatment parameters according to the flue gas detection data at the flue gas inlet and the flue gas outlet to meet the emission standards.

[0025] Combined with the second aspect, in an alternative embodiment, installation branch pipes are arranged at both the flue gas inlet and the flue gas outlet, and the sampling ends are inserted into the installation branch pipes.

[0026] In the above implementation process, by inserting the sampling ends into the installation branch pipes at the flue gas inlet and the flue gas outlet, the flue gas in the flue can flow into the accommodation chamber from the installation branch pipes and then flow into the sampling tube from the accommodation chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0028] Figure 1 is a connection schematic diagram of the flue gas emission system provided by the embodiment of the present application;

[0029] Figure 2 is a partial cross-sectional view of the flue gas emission system provided by the embodiment of the present application;

[0030] Figure 3 is Figure 2 a partial enlarged view of part A in

[0031] Figure 4 is Figure 2 a partial enlarged cross-sectional schematic diagram of part B in

[0032] Icon: 1 - Flue gas emission system; 10 - Flue; 11 - Smoke outlet; 12 - Smoke inlet; 13 - Installation branch pipe; 14 - Second connecting ring; 20 - Flue gas analysis device; 21 - Analyzer; 211 - Sampling pipe; 2111 - Sampling end; 212 - CEMS cabinet; 213 - Sampler; 214 - Trace heating pipe; 22 - Dust removal mechanism; 221 - Metal filter pipe; 2211 - Accommodation chamber; 222 - Backblower; 223 - Blowing pipe; 224 - Connecting pipe; 225 - First connecting ring; 226 - Flanging piece; 227 - Pulse valve. Specific implementation manner

[0033] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0036] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "top", "bottom", "inside" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0038] With the continuous improvement of environmental protection requirements, emission standards are constantly being lowered. For example, the ultra-low emission standard: NO x ≤50mg / Nm 3 , SO 2 ≤35mg / Nm 3 , PM ≤ 10mg / Nm 3 . With the implementation of ultra-low emission standards, environmental protection facilities such as desulfurization and denitrification need to achieve more timely and accurate control.

[0039] In order to more accurately and timely control and implement environmental protection facilities such as desulfurization and denitrification, the concentration of flue gas components, flue gas flow rate, temperature and other data at the inlet 12 and outlet 11 of the flue 10 in the flue gas emission system 1 can be detected. According to the emission standard, the input amount of desulfurization and denitrification agents is calculated by a preset formula, and then adjusted by comparing the set data with the actual data, and finally the emission standard is achieved.

[0040] Currently, an on-line flue gas detection instrument (CEMS) is installed at the outlet 11 of the flue 10 in the flue gas emission system 1. The flue gas at the outlet 11 is extracted for analysis and detection, and then the flue gas treatment process is adjusted according to the analysis and detection results to meet the emission standard.

[0041] The flue gas at the outlet 11 has undergone processes such as dust removal, cooling, desulfurization or denitrification, which will cause a significant reduction in the temperature and dust content of the flue gas flowing to the outlet 11. However, due to the high-temperature and high-dust working conditions at the inlet 12 of the flue 10 (for example: the flue gas temperature at the C1 port of the cement kiln tail: 300 - 340 °C, dust concentration: 80 - 100 g / Nm 3 ; the flue gas temperature at the economizer outlet of the heating boiler is 350 - 400 °C, dust concentration: 30 - 40 g / Nm 3 ), the existing on-line flue gas detection instruments cannot adapt to high-dust working conditions, the flue gas sampling pipe is prone to blockage, continuous and stable data cannot be provided, and the instrument maintenance workload is large.

[0042] Therefore, this application further improves the flue gas emission system 1 and the flue gas analysis device 20, so as to improve the problem of flue gas analysis and detection under high-temperature and high-dust working conditions in the related technology to a certain extent. To make the purpose, technical solution and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application.

[0043] Please refer to Figure 1 , the embodiment of this application provides a flue gas emission system 1, including a flue 10 and a flue gas analysis device 20.

[0044] Among them, please combine Figure 1 and Figure 2, the flue gas analysis device 20 includes an analyzer 21 and a dust removal mechanism 22.

[0045] Among them, please refer to Figure 2 , Figure 3 and Figure 4 , the analyzer 21 includes an analyzer body and a sampling tube 211. The air inlet of the analyzer body is communicated with the sampling tube 211, and the sampling tube 211 has a sampling end 2111 away from the analyzer body. The sampling end 2111 is used to be inserted into the flue 10 to extract the flue gas in the flue 10.

[0046] Among them, the dust removal mechanism 22 includes a metal filter tube 221, a back blower 222 and a spray pipe 223. The inside of the metal filter tube 221 has a receiving chamber 2211. The sampling end 2111 is located in the receiving chamber 2211 and there is a gap between the outer wall of the sampling end 2111 and the inner wall of the metal filter tube 221 to filter the flue gas pumped to the sampling end 2111. The back blower 222 is selectively communicated with the gap of the receiving chamber 2211 through the spray pipe 223 to spray a cleaning gas into the gap to blow off the soot outside the metal filter tube 221.

[0047] When using the above flue gas emission system 1 for flue gas emission, the flue gas analysis device 20 can be used to extract the flue gas in the flue 10. The extracted flue gas flows into the receiving chamber 2211 after being filtered by the metal filter tube 221, and then is pumped to the analyzer body by the sampling tube 211 for flue gas analysis.

[0048] As the flue gas emission progresses, soot is likely to accumulate at the metal filter tube 221. Since the metal filter tube 221 is sleeved outside the sampling tube 211, the outer wall of the metal filter tube 221 can be directly cleaned, reducing the cleaning workload and difficulty. If the metal filter tube 221 is arranged on the inner wall of the sampling tube 211, it is more difficult to clean the metal filter tube 221 inside the sampling tube 211, and soot is likely to accumulate on the inner wall of the sampling tube 211, increasing the workload of cleaning the inner wall of the sampling tube 211.

[0049] Moreover, in order to facilitate the cleaning of the soot at the metal filter tube 221, a back blower 222 and a spray pipe 223 are also provided in the flue gas analysis device 20 provided in the embodiment of the present application. The back blower 222 is communicated with the gap of the receiving chamber 2211 inside the metal filter tube 221 through the spray pipe 223. The back blower 222 can spray a cleaning gas into the gap of the receiving chamber 2211 to blow off the soot attached to the metal filter tube 221.

[0050] The cleaning gas is blown into the gap of the accommodation chamber 2211 inside the metal filter tube 221 by means of a back-blowing device 222 and a blowing pipe 223, rather than directly blowing the cleaning gas onto the outer wall of the metal filter tube 221. On the one hand, it can reduce the probability that the cleaning gas blows the soot adhering to the outer wall of the metal filter tube 221 into the accommodation chamber 2211, thereby reducing the probability that the soot flows into the sampling tube 211 and clogs the sampling tube 211 or the analyzer body. On the other hand, when the cleaning gas is blown into the gap of the accommodation chamber 2211, the cleaning gas can pass through the pores of the metal filter tube 221 wall from the gap of the accommodation chamber 2211 and be discharged to the outside of the metal filter tube 221. This is opposite to the flow direction of the flue gas flowing from the outside of the metal filter tube 221 through the pores of the tube wall into the accommodation chamber 2211, which can improve the soot removal efficiency and reduce the probability of soot clogging the pores.

[0051] The analyzer body can correspondingly analyze the characteristics of the flue gas sample conveyed by the sampling tube 211, such as analyzing the composition, concentration, flow rate, temperature and other characteristics of the flue gas sample.

[0052] In some possible embodiments, please continue to refer to Figure 1 , the analyzer body includes a CEMS cabinet 212 and a sampler 213. The sampling tube 211 is connected to the air inlet of the sampler 213, and the sampler 213 is connected to the CEMS cabinet 212 through a tracing pipe 214.

[0053] The CEMS cabinet 212 is a commercially available extractive flue gas on-line monitoring system, which will not be elaborated here.

[0054] The sampler 213 is used to convey the flue gas sample conveyed by the sampling tube 211 to the tracing pipe 214, and then conveyed by the tracing pipe 214 to the CEMS cabinet 212 for analysis and detection.

[0055] In some possible embodiments, a filter screen can also be provided in the sampling tube 211, and a back-blowing member can also be provided in the sampler 213 to back-blow the filter screen in the sampling tube 211. A suction pump is provided at the sampler 213.

[0056] The metal filter tube 221 has an accommodation chamber 2211, and the sampling end 2111 of the sampling tube 211 can be inserted into the accommodation chamber 2211. The tube wall of the metal filter tube 221 has a plurality of tiny pores, so that the gas in the flue gas sample outside the metal filter tube 221 can pass through the pores and flow into the accommodation chamber 2211, while the soot particles in the flue gas sample are blocked outside the metal filter tube 221 and cannot enter the accommodation chamber 2211.

[0057] In some possible embodiments, the material of the tube wall of the metal filter tube 221 is selected from a sintered metal powder body, which has high air permeability. The sintered metal powder body also has good high temperature resistance and corrosion resistance, which can improve the durability of the metal filter tube 221.

[0058] To facilitate the sampling end 2111 of the sampling tube 211 to extend into the accommodation chamber 2211, the metal filter tube 221 covers the sampling end 2111 so that the filtered flue gas flows into the sampling tube 211. In some possible embodiments, please continue to refer to Figure 4 , the shape of the metal filter tube 221 can be cylindrical, having an annular tube wall and a tube bottom connected to the bottom end of the annular tube wall. The tube wall and the tube bottom enclose to form the accommodation chamber 2211. The top end of the tube wall is an opening, which facilitates the sampling end 2111 to extend into the accommodation chamber 2211 from the opening.

[0059] To make there be a gap between the inner wall of the metal filter tube 221 and the outer wall of the sampling end 2111, in one possible embodiment, the outer diameter of the sampling end 2111 is smaller than the inner diameter of the metal filter tube 221.

[0060] Furthermore, to facilitate the connection between the blowing tube 223 and the accommodation chamber 2211 of the metal filter tube 221, in some possible embodiments, please continue to refer to Figure 3 , the dust removal mechanism 22 further has a connecting pipe 224. The connecting pipe 224 is sleeved outside the sampling tube 211. The first end of the connecting pipe 224 is hermetically connected to the analyzer body, and the second end of the connecting pipe 224 is detachably and hermetically connected to the metal filter tube 221; the blowing tube 223 is communicated with the connecting pipe 224.

[0061] When it is necessary to remove dust from the metal filter tube 221, the back blower 222 is turned on, and the cleaning gas released by the back blower 222 flows into the connecting pipe 224 through the blowing tube 223. Since the first end of the connecting pipe 224 is hermetically connected to the analyzer body, the cleaning gas flowing into the connecting pipe 224 will flow from the connecting pipe 224 into the gap of the accommodation chamber 2211 of the metal filter tube 221 and blow out through the air holes at the tube wall of the metal filter tube 221, blowing off the soot attached to the outer wall of the metal filter tube 221.

[0062] Furthermore, please continue to refer to Figure 3 , a first connecting ring 225 can be arranged at the second end of the connecting pipe 224, and a flanging piece 226 can be arranged at the end of the metal filter tube 221, and the flanging piece 226 is hermetically connected to the first connecting ring 225.

[0063] The flanging piece 226 is made of a sealing material.

[0064] Exemplarily, threaded holes corresponding to the first connection ring 225 can be provided at the flanging piece 226. By passing screws through the threaded holes at the flanging piece 226 and the first connection ring 225, the flanging piece 226 is tightened with the first connection ring 225 to realize the connection between the connecting pipe 224 and the metal filter pipe 221.

[0065] Alternatively, in some possible embodiments, please refer to Figure 1 and Figure 3 , an installation branch pipe 13 is provided at the flue 10, and a second connection ring 14 is provided at the connection end of the installation branch pipe 13. When it is necessary to collect the flue gas sample in the flue 10, the first connection ring 225 and the second connection ring 14 can be connected through a fixing member, and at the same time, the flanging piece 226 of the metal filter pipe 221 is clamped between the first connection ring 225 and the second connection ring 14, so that the metal filter pipe 221 can extend into the installation branch pipe 13.

[0066] Exemplarily, the first connection ring 225 and the second connection ring 14 can be selected from flanges. The fixing member can be selected from screws, and the screws pass through the connection holes in the flanges.

[0067] During sampling, the flue gas then flows into the accommodation chamber 2211 after being filtered by the metal filter pipe 221, flows from the accommodation chamber 2211 to the sampler 213 through the sampling pipe 211, and the flue gas sample flowing into the sampler 213 flows to the CEMS cabinet 212 through the trace heating pipe 214, and is detected and analyzed at the CEMS cabinet 212.

[0068] When it is necessary to clean the metal filter pipe 221, the cleaning gas released by the back-blower 222 flows from the blowpipe 223 into the gap of the accommodation chamber 2211 through the connecting pipe 224 and is discharged from the air holes of the metal filter pipe 221. When the cleaning gas passes through the air holes, the soot at the metal filter pipe 221 can be blown off.

[0069] In one possible embodiment, the back-blower 222 can be an air bag, and the air bag is used to store compressed cleaning gas. The compressed cleaning gas can be compressed air.

[0070] In one possible embodiment, a pulse valve 227 can be provided at the blowpipe 223 to control the release or stop of the release of the cleaning gas from the air bag by the pulse valve 227.

[0071] Furthermore, the pulse valve 227 can be signal-connected to the CEMS cabinet 212. After the CEMS cabinet 212 operates for a set time, a signal is sent to the pulse valve 227, and the pulse valve 227 releases the cleaning gas stored in the air bag.

[0072] Further, in some possible embodiments, an installation branch pipe 13 is provided at the smoke inlet 12 of the flue 10, and a flue gas analysis device 20 is provided at the smoke inlet 12. The first connection ring 225 of the flue gas analysis device 20 is connected to the second connection ring 14 for extracting a flue gas sample at the smoke inlet 12 for detection and analysis. Similarly, an installation branch pipe 13 is provided at the smoke outlet 11 of the flue 10, and a flue gas analysis device 20 is provided at the smoke outlet 11. The first connection ring 225 of the flue gas analysis device 20 is connected to the second connection ring 14 for extracting a flue gas sample at the smoke outlet 11 for detection and analysis. The flue gas treatment process in the flue 10 can be adjusted according to the detection data at the smoke inlet 12 and the smoke outlet 11 to meet the emission requirements.

[0073] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flue gas analysis device, characterized in that: include: An analyzer, the analyzer comprising an analyzer body and a sampling tube, the air inlet of the analyzer body being in communication with the sampling tube, the sampling tube having a sampling end away from the analyzer body for inserting into a flue; A dust removal mechanism, the dust removal mechanism includes a metal filter tube, a backblower and a blow pipe, the metal filter tube has a accommodating chamber inside, the sampling end is located in the accommodating chamber and there is a gap between the outer wall of the sampling end and the inner wall of the metal filter tube to filter the flue gas pumped to the sampling end; the backblower can be selectively connected to the gap in the accommodating chamber through the blow pipe to blow clean gas into the gap to blow away the smoke outside the metal filter tube.

2. The flue gas analysis device according to claim 1, characterized in that: The dust removal mechanism includes a connecting pipe, which is sleeved outside the sampling tube, a first end of which is sealed and connected to the analyzer body, and a second end of which is detachably sealed and connected to the metal filter tube; the blowing pipe is connected to the connecting pipe.

3. The flue gas analysis device according to claim 2, characterized in that: The second end of the connecting pipe is provided with a first connecting ring, and the end of the metal filter pipe is provided with a flanged piece, and the flanged piece is fixedly and sealedly connected to the first connecting ring.

4. The flue gas analysis device according to claim 3, characterized in that: The first connecting ring is provided with a connecting hole, and a fixing piece is passed through the connecting hole. The fixing piece is used to be fixed to the second connecting ring on the end of the flue, so that the first connecting ring and the second connecting ring clamp the flange piece.

5. The flue gas analysis device according to any one of claims 1 to 4, characterized in that: The analyzer body comprises a CEMS cabinet and a sampler, the sampling tube is connected to the air inlet of the sampler, and the sampler is connected to the CEMS cabinet via a heating pipe.

6. The flue gas analysis device according to claim 5, characterized in that: The blowing pipe is provided with a pulse valve, the back-blowing device is an air bag, and the air inlet of the pulse valve is connected to the air bag.

7. The flue gas analysis device according to claim 6, characterized in that: The pulse valve is connected to the CEMS cabinet by signal. After the CEMS cabinet runs for a set time, it sends a signal to the pulse valve, and the pulse valve releases the clean gas stored in the gas bag.

8. A flue gas exhaust system, characterized in that: It comprises a flue and the flue gas analysis device according to any one of claims 1 to 7, wherein the sampling end is inserted into the flue.

9. The flue gas exhaust system according to claim 8, characterized in that: The flue has a smoke inlet and a smoke outlet, and the sampling end is inserted into the smoke inlet and the smoke outlet.

10. The flue gas exhaust system according to claim 9, characterized in that: The smoke inlet and the smoke outlet are both provided with mounting branch pipes, and the sampling end is inserted into the mounting branch pipes.

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