TWI337242B - Flue gas sampling unit of flue gas system and the method for the same - Google Patents

Description

1337242

IX. Description of the Invention: [Technical Field] The present invention relates to a flue gas sampling unit of a flue gas system and a sampling method thereof, and more particularly to a flue gas sampling unit of a flue gas system capable of continuously and uniformly sampling Sampling method. [Prior Art] Effective combustion can increase the efficiency of combustion equipment and reduce the cost of fuel, and under the appropriate combustion adjustment control, can further reduce air pollution emissions and meet environmental standards. Generally speaking, when judging the quality of combustion in a combustion furnace, the smoke component produced by combustion is often used as the main object of judgment; please refer to the sixth figure, which shows a schematic diagram of a conventional smoke sampling system. The traditional sampled flue gas is taken at the exit of the chimney 20 for flue gas 2 sampling. However, the flue gas 2 located at the chimney 20 belongs to the rear section of the system, and after passing through, for example, an air preheater, a pollution prevention device, a dust removal device having a filter material 32, etc., may have lost the original composition of the flue gas 2, It is also possible that the external air leaks into the flue gas 2 pipeline, so it is often impossible to faithfully present the actual combustion condition of the combustion furnace. In addition, the pipes of the traditional flue gas 2 sampling are mostly exposed to the atmosphere, and the water vapor in the sampling flue gas 2 will condense into water, and the water after the condensation often blocks the flue gas. Road, resulting in uneven sampling of flue gas 2 or insufficient sampling of flue gas 2 . In addition, for different fuel types, different flue gas 2 sampling treatment methods are also required. For fuel or gas burners, when the flue gas 2 is sampled, due to its fuel properties, its particulate matter consists of low particulate pollutants, which can be directly contacted with the analyzer for analysis. But for use 5 1337242

Coal burning = large-scale combustion furnace unit and s, because the coal carbon component already has more ash, and there is a certain proportion of fly ash in the by-product after combustion, so it is often scattered in the flue gas. It is necessary to install the filter material 32 for the purpose of passing the dust particles such as fly ash in the flue gas, and it is necessary to manually replace the new filter material 32 to maintain the subsequent analysis data, and also based on the characteristics of the filter material 32. Restriction, the sampling of its flue gas is often not continuously obtained. For systems that need to use the computer 31 to operate a controller 34 to record the flue gas analysis results for a long time, it is often impossible to obtain complete sampling data, and the life loss of the analyzer is degraded. The function is invalid. In view of this, there is a need for a flue gas sampling device and method to reduce the labor and filter consumables required for the flue gas sampling device, overcome the disadvantages of not being able to continuously sample the flue gas, and overcome the uneven sampling smoke. Phenomenon and the actual content of the flue gas sampling and further analysis by flue gas sampling, improve the efficiency of the combustion equipment under appropriate combustion adjustment control, and reduce the cost of fuel and meet environmental standards. SUMMARY OF THE INVENTION The object of the present invention is to provide a flue gas sampling unit of a flue gas system and a sampling method thereof to reduce the cost of manpower and filter consumables on conventional flue gas sampling, and overcome the disadvantages of being unable to continuously sample flue gas, and overcome Sampling smoke is uneven and how to accurately present the sampled flue gas. Another object of the present invention is to provide a problem of avoiding the condensation of water vapor in the sampled flue gas into water and blocking the flue gas. Another object of the present invention is to provide long-term continuous smoke sampling. 6 |337242

A flue gas system for achieving the above object comprises: a coal supply device providing a coal; a boiler connected to the coal supply device, wherein the coal supplied by the coal supply device is sent to the boiler for combustion to generate a flue gas a first heat exchanger connected to the boiler; a second heat exchanger connected to the first heat exchange; and a flue gas sampling unit connecting the first heat exchanger and the second heat exchanger And sampled from the smoke. Preferably, the coal feeding device comprises a feeding trough, a coal feeding device and a coal grinding device, the feeding trough storing coal, so that the coal feeding device transports the coal in the feeding trough to the coal grinding device grinding. Preferably, a gate is provided at the bottom of the boiler to discharge the burnt cinder. Preferably, the flue gas sampling unit includes a plurality of sampling elements disposed between the first heat exchanger and the second heat exchanger. Wherein the sampling element is evenly distributed over the cross-sectional area of the first heat exchanger and the second heat exchanger. Preferably, there are six sampling elements on the first heat exchanger and four sampling elements on the second heat exchanger. Preferably, the first heat exchanger is an economizer. Preferably, the second heat exchanger is an air preheater. In addition, the present invention also provides a flue gas sampling unit of a flue gas system, comprising a plurality of sampling elements for sampling from a flue gas; a plurality of solenoid valve assemblies respectively connected to the plurality of sampling elements; and a plurality of pneumatic valve assemblies respectively Connecting the solenoid valve assembly; a controller controlling the opening and closing of the solenoid valve assembly and the pneumatic valve assembly; a filter coupled to the pneumatic 7 1337242 valve assembly to filter the flue gas; and an analyzer, and The filter is connected to allow analysis of the smoke. Preferably, the flue gas sampling unit further comprises a heating and heat insulating component coated on the pipe member at the rear end of the filter to prevent the water vapor in the sampling flue gas from condensing into water and blocking the flue gas. Preferably, the flue gas sampling unit has a first filter and a second filter disposed between the filter and the analyzer. The present invention also provides a method for sampling a flue gas of a flue gas sampling unit, comprising: providing a plurality of sampling elements to the first heat exchanger and the second heat exchanger; and initiating each solenoid valve assembly corresponding to the plurality of sampling elements Sampling the flue gas of each pneumatic valve assembly corresponding to the solenoid valve assembly; filtering the flue gas; and analyzing the flue gas. The step of starting each solenoid valve assembly and each pneumatic valve assembly further includes: starting a first solenoid valve assembly and a first pneumatic valve assembly, and closing the first solenoid valve assembly and the first pneumatic valve at intervals And actuating a second solenoid valve assembly and a second pneumatic valve assembly to sequentially activate/deactivate each solenoid valve assembly and each pneumatic valve assembly such that each sampling element is coupled to the first heat exchanger The second heat exchanger samples the flue gas; and activates all of the solenoid valve assemblies and all of the pneumatic valve assemblies such that each sampling element simultaneously samples the flue gas in the first heat exchanger and the second heat exchanger. Preferably, to maintain the sampling line clean, the present invention causes an air to be purged from the pneumatic valve assembly through the solenoid valve assembly into the sampling element. The method further includes: starting a first solenoid valve assembly and a first pneumatic valve assembly, closing the first solenoid valve assembly and the first pneumatic valve assembly at a time, and starting a second solenoid valve assembly and an 8 1337242 93⁄4 1 · 2 6 Revision Year 曰Supply the second pneumatic valve assembly, thus sequentially opening/closing each solenoid valve assembly and each pneumatic valve assembly to clean each sampling element; and starting a seventh solenoid valve The assembly and a seventh pneumatic valve assembly are spaced apart for a period of time to close the seventh solenoid valve assembly and the seventh pneumatic valve assembly, and activate an eighth solenoid valve assembly and an eighth pneumatic valve assembly, thereby sequentially starting/ Each solenoid valve assembly and each pneumatic valve assembly are closed to clean each sampling element. Thus, the present invention can achieve the specific effects of reducing the labor required for the sampling of the flue gas and the cost of the filter consumables, and the possibility of successfully sampling the flue gas continuously, sampling the flue gas uniformly and actually presenting the flue gas. The present invention will be fully described with reference to the accompanying drawings in which the preferred embodiments of the present invention are described, but it should be understood that those skilled in the art can modify the invention described herein while obtaining the invention. The effect. Therefore, it is to be understood that the following description is not to be construed as limiting the invention. Please refer to the first figure for a schematic diagram showing the structure of the flue gas sampling unit of the flue gas system of the present invention. The flue gas system of the present invention comprises a coal feeding device 10, a fan 14, a boiler 15, a first heat exchanger 17, a second heat exchanger 18, a dust collector 19, a chimney 20 and a smoke sampling. Unit 3, wherein the first heat exchanger 17 is a lumper and the second heat exchanger 18 is an air preheater. The dust remover 19 can be an electrostatic precipitator or a baghouse. The coal feeding device 10 is connected to the boiler 15, and the economizer 17 is connected with the 9 5·. ^ ^ 1337242 9

The boiler 15 is connected. The economizer 17 is connected to the air preheater 8 . The air preheater 18 is connected to the precipitator 19, and finally the precipitator = is connected to the chimney 20 to allow the flue gas to be discharged. The main feature of the present invention is that the flue gas sampling unit 3 samples flue gas from the air preheater 18 and the economizer 17, thereby adjusting the combustion efficiency of the boiler by determining the condition of the flue gas. The coal feeding device 10 comprises a feed tank 1 , an arson and a coal grinding device 13 ′ for feeding the coal, and supplying the coal to the coal feeder 12 . The coal feeder 12 is connected to the feed tank 11 to deliver the stored medium to the boker 12. The coal grinding device 13 is connected to the coal conditioner 12, and the coal material fed from the coal feeder 12 is ground in the f 13 . The present invention further utilizes the blower 14 to transport the milled media into the boiler 15 for combustion. The bottom of the boiler 15 has a medium. Because the coal-saving 1 17 series is a heat exchanger, it is possible to convert 8 〇 (the rc gin's Gaoxi flue gas through heat exchange to 60 (TC lower temperature flue gas. The coal gang g] 7 recovered titanium chrome ·5Γ , , , M , u , person , . , _ , _

The door 16 can be collected and sent away by the discharge of the gate 16 after the coal material is burned. The flue gas generated by the combustion of the coal material enters the crying '10 1337242 96. 1. 26 revised year 曰 replenishment sample unit 3 samples the flue gas from the air preheater 18 and the economizer 17, thereby judging the smoke The gas conditions adjust the combustion efficiency of the boiler so that the system can be controlled to have better combustion efficiency. Since the amount of dust in the flue gas of the conventional flue gas system is large and the temperature is high, it is a preferred method to use the flue gas sampling unit of the present invention.

The flue gas sampling unit 3 of the present invention is disposed between the economizer 17 and the air preheater 18 for flue gas sampling. Please refer to the second a diagram and the first diagram B, which are schematic diagrams of the first figure VIII of the present invention and the line diagram of the first diagram B-B. The flue gas sampling unit 3 of the present invention is provided with a plurality of sampling elements 4a on the cross-sectional area of the economizer 17. Preferably, six sampling elements 4a are evenly distributed across the cross-sectional area of the economizer 17 connected to one end of the air preheater 18, as shown in the second a diagram. A plurality of sampling elements 4b are disposed on the wearing area of the air preheater 18, and preferably, the air preheater 18 connected to one end of the economizer 17 is evenly distributed across the cross-sectional area of the air preheater 18. Sampling elements 4b, as shown in Figure B. Therefore, the present invention can achieve uniform and true representation of the flue gas state inside the flue gas system and the composition of the constituents, and appropriately after the analysis, the combustion efficiency of the filaments and (4), etc. The burning efficiency is up to (four), and the cost of fuel can be reduced to reduce air pollution emissions and meet environmental standards. Please ^ the third figure ' shows the invention _ kind of flue gas sampling unit ί _ gas sampling unit 3 contains a plurality of sampling elements (4a, 4b), pipe fittings (4c, 4d, 4e, 4f), - controller %...Electromagnetic cymbal 27, a pneumatic valve assembly 28, a second solenoid valve assembly 29, a heating and holding (four) 24, a transition, a - transition -%, a 11 1337242

a filter 36 and an analyzer 4, the filter is a wet dust bucket 25, the fluorine valve assembly 28 is connected to the pipe (4c, 4d), and the pipe (4c, 4d) and the sampling element (4a) , 4b) the connection is activated when the sampling element (4a, 4b) needs to be cleaned or when the flue gas needs to be sampled for sampling of the flue gas or cleaning of the mouth into the air. The first solenoid valve assembly 27 is coupled to the controller 26 via a signal transmission line 21b for controlling and actuating the pneumatic valve assembly 28 to initiate flue gas sampling. The second solenoid valve assembly 29 is coupled to the delta controller 26 by the signal transmission line 21b for controlling and actuating the pneumatic valve assembly 28 to initiate air injection for cleaning the sampling element (4a). 4b), in which the method of controlling smoke sampling and air injection cleaning is described in detail in the following paragraph. The flue gas in each of the sampling elements (4&) passes through the tube 4c of the flue gas sampling unit 3, and enters the wet dust removing barrel 25, and the tube 4c can extend into the wet dust removing barrel 25. The liquid portion is used for filtering impurities such as dust in the flue gas, and then the flue gas rises and floats out of the water surface, and is sent to the analyzer 40 via the pipe member 4d. Wherein the liquid can be water. The heating and thermal insulation component 24 is wrapped on the pipe fitting 4d behind the wet dust removing bucket 25 to ensure that the temperature of the flue gas after passing through the wet dust removing bucket 25 is higher than the temperature of the water vapor condensation, so as to avoid water damage in the flue gas. Condensate the tube 4d. In addition, the heating and heat preservation component 241 is such that the internal pipeline can be kept above a certain temperature to avoid the problem that the above water condensation is blocked. The first filter 35 and the second filter 36 are disposed on the pipe member 4d entering the analyzer 40 after the wet dust removing bucket 25, so as to filter the dust particles to make the flue gas more Clean to avoid damage to the analyzer. In addition, the controller 26 is a programmable logic control 12 1337242

The 26曰S complementer 'and an external signal line or network route 22 to the external computer 23' is used to modify or set a new program that meets the designer's needs and is used to update the programmable logic control. Device. It is even possible to record analytical data or perform various conditions and so on.

Positive % Please refer to the fourth A and fourth b diagrams for the flow chart and actuation block diagram of the flue gas sampling unit of the present invention. The flue gas sampling unit of the present invention enters the sampling element (4a, 4b) at the economizer 17 and the air preheating gas I8 before the operation, and the user can set a sampling requirement on the computer 23. A program logic program that controls the sampling elements (4a, 4b) for smoke sampling during the heart's time. Preferably, the cross-sectional area of the economizer 17 is provided with six sampling elements 4a, and the cross-sectional area of the air preheater 18 has four sampling elements 4b' as shown in the second A and B diagrams. . When the smoke sampling is required, the first solenoid valve assembly 27 is activated, and the different sampling elements (4a, 4b) can be switched by switching each solenoid valve in the first electromagnetic wide assembly 27 sequentially to be turned on/off. Sampling the flue gas. The power of the flue gas sampling is from the pneumatic valve assembly 28, and when the pneumatic valve assembly 28 is activated, each pneumatic valve of the pneumatic valve assembly 28 sequentially activates the switching of each solenoid valve that cooperates with the first solenoid valve assembly 27. The sampling elements (4a, 4b) are sampled. When the pneumatic valve assembly 28 and the first solenoid valve assembly 27 are actuated, even if the sampling element (4a, 4b) is sucked into the flue gas and sampled, the flue gas is sampled and then enters the filter 25 of the clear dust bucket for use. Impurities such as dust particles in the flue gas are filtered and then passed through the tube to the analyzer 40. The tube 4d is externally coated with the heating and temperature-preserving assembly 24 to ensure that the temperature of the flue gas is higher than the temperature at which the water vapor condenses, so that the flue gas does not condense into water and block the tube 4d. Better 13

The flue gas passes through the first filter 35 and the second filter 36 to be used again; the impurities and the like are considered to make the flue gas cleaner, and finally the analyzer 40 can be used to protect the analyzer. 4〇 Avoid damage and extend life. The flue gas entering the analyzer 40 analyzes the state of the flue gas to understand the state of combustion in the furnace. Referring to the fourth C diagram, the flow chart of the cleaning smoke sampling component of the present invention is shown, that is, the user sets a programmable logic program on the computer 23 that meets the air injection cleaning requirements. The gas sampling unit of this county is outside the sampling of smoke, and air can be sprayed to clean the sampling elements (4a, 4b). The invention controls the actuation of each solenoid valve of the second solenoid valve assembly 29 corresponding to the sampling element (4a, 4b) during the time when the flue gas intake sampling the empty building, and activates the pneumatic valve assembly 28, thereby sending the person The line is cleaned to prevent dust particles from accumulating in the sampling element (4a, 4b). See Figure 5A for the month to show the smoke sampling method of the flue gas sampling unit of the present invention. The process is to sample by using six bit=kerchers 17 and four sampling elements (4a, 4b) located in the air position H. Here, six sampling elements 4a are defined first, and the sampling elements 4a to sixth are prepared. 7 The fourth sampling element 4b of the air preheater 18 is the seventh sampling 7C piece 4b to the tenth sampling element servant, and the first sampling element 4a is sampled every 15th to the sixth sampling element 4a, and then After 15 minutes, the first to 4a were simultaneously turned on to sample the flue gas. Therefore, sampling is performed by sample 4a' and then all are turned on and sampled together, two =: 丄幻7242

Both are uniformly and smoked. Then, sampling is started from the seventh sampling element 4b to the tenth sampling element 4b at intervals of 15 minutes, and after another 15 minutes, the seventh to tenth sampling elements 4b are simultaneously turned on to sample the flue gas, such as As described above, average and uniform smoke sampling can be achieved. In this way, a cycle of flue gas sampling is completed.

Referring again to Figure 5B, the flow control diagram of the method for cleaning the flue gas sampling component of the flue gas sampling unit of the present invention is shown. When cleaning, an external air supply source (not shown) is connected to the second solenoid valve assembly 29, and communicates with the pneumatic valve assembly 28, when the sampling elements (4a, 4b) and the pipe fittings are required to be cleaned. When the 'starting solenoid valve' of the second solenoid valve assembly 29 is activated and the pneumatic valve assembly 28 is activated, air can be injected into the sampling element (4a, 4b) to clean the dust. The operation is as follows. First, the air is injected into the sixth sampling element 4a from the first sampling element 4a of the economizer 17 in sequence, one by one at intervals of 30 seconds, and is preheated in the air. The seventh sampling element of the device 18 begins to inject air into the tenth sampling element 4b, thus completing one cycle, and performing the cleaning of the next cycle is also the same as above, and each cleaning is performed for 2 minutes. If the sampling time is over, the cleaning progress will stop cleaning regardless of where it is going; that is, the cleaning actuation system will open and close with the sampling action. Thus, the flue gas sampling unit 3 of the present invention uses the controller 26 to control the flue gas intake sampling or the injection air cleaning to perform the sampling of the flue gas or the cleaning of the sampling elements (4 a, 4 b ), so that the consumption can be saved. The cost of replacing the filter material by manpower can also achieve the effect of continuous sampling without interruption and preventing the smoke from clotting into the analyzer and clogging the pipeline. After the detailed description of the preferred embodiment of the invention, the user is familiar with the technique 15 / · _· 1337242

It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the inventions.

< 5 > 1337242 A _ 96. 1. 26 Amendment Year Month 曰 Supplement [Simplified Schematic] The first figure shows the schematic diagram of the structure of the flue gas sampling unit of the flue gas system of the present invention. Figure 1A is a cross-sectional view showing the first line A-A of the present invention. Figure 1B is a cross-sectional view showing the first Figure B-B of the present invention. The third figure shows the schematic diagram of the structure of the flue gas sampling unit of the present invention. Figure 4A shows a flow chart of the operation of the flue gas sampling unit of the present invention. Figure 4B shows an actuating block diagram of the flue gas sampling unit of the present invention. • Figure 4C shows the flow diagram of the cleaning smoke sampling element of the present invention. Fig. 5A is a graph showing the sampling flow control chart of the flue gas sampling method of the flue gas sampling unit of the present invention. Fig. 5B is a flow chart showing the flow of the cleaning flue gas sampling element method of the flue gas sampling unit of the present invention. The sixth figure shows a schematic diagram of a conventional smoke sampling system. Φ [Main component symbol comparison description] 1 - Flue gas system 2 - Flue gas 3... Flue gas sampling unit 4 a. - Sampling element 4b - Sampling element 4c... Pipe fitting 4d... Pipe fitting 4e... Pipe fitting 17 1337242 96· 1. 26 Revision Year 曰 Supplement 4f... Pipe fitting 10... Coal feeding device 11 - Feed tank 12 - Feeder 13... Coal mill 14 - Fan 15 - Pin furnace 16 - Gate

17- -- Economizer 18 - - Air preheater 19... Dust collector 20... Chimney 21a - 彳 & 5 Tiger transmission line 21b - Signal transmission line 22 - Network route 23 - Computer

24...heating and heat insulating component 241--heating and heat insulating component 25...wet dusting bucket 26...controller 27...first solenoid valve component 28...pneumatic valve component 29—second electromagnetic wide component 31—computer 32—filter material 18 1337242

34...controller 35 - first filter 36 - second filter 4 〇...analyzer

19

Claims (1)

1337242 9β. 1·26 Amendment Η曰 Supplement 10. Scope of application: 1. A flue gas system comprising: a coal supply unit providing one coal; a boiler connected to the coal supply unit to supply the coal supply unit The coal is sent to the boiler for combustion to generate a flue gas; a first heat exchanger is connected to the boiler; a second heat exchanger is connected to the first heat exchanger; and a flue gas sampling unit is A first heat exchanger and the second heat exchanger are connected and sampled from the passing flue gas. 2. The flue gas system of claim 1, wherein the coal feeding device comprises a feed trough, a coal feeder and a coal grinding device, the feed trough storing coal and connecting the coal feeder, The coal feeder transports the coal to the coal milling device for grinding. 3. The flue gas system of claim 1, wherein a gate is provided at the bottom of the boiler to discharge the burnt cinder. 4. The flue gas system of claim 1, wherein the flue gas sampling unit comprises a plurality of sampling elements disposed between the first heat exchange ® and the second heat exchanger. 5. The flue gas system of claim 4, wherein the sampling element is evenly distributed over the wearing area of the first heat exchanger. 6. The flue gas system of claim 5, wherein the sampling element is located in a cross-sectional area of the first heat exchanger end coupled to the second heat exchanger. 7. The flue gas system of claim 6, wherein the sampling element is six. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; 9. The flue gas system of claim 8 wherein the sampling element is located in a cross-sectional area of the second heat exchanger end coupled to the first heat exchanger. 10. The flue gas system of claim 9, wherein the sampling element is four. 11. The flue gas system of claim 1 further comprising a precipitator. 12. The flue gas system of claim 11, wherein the precipitator is an electrostatic precipitator. 13. The flue gas system of claim 11, wherein the precipitator is a bag filter. 14. The flue gas system as described in claim 1 further includes a chimney. 15. The flue gas system of claim 1, wherein the first heat exchanger is an economizer. 16. The flue gas system of claim 1, wherein the second heat exchanger is an air preheater. 17. A flue gas sampling unit for a flue gas system, comprising: a plurality of sampling elements for sampling from a flue gas; a first solenoid valve assembly respectively connecting the plurality of sampling elements; a pneumatic valve assembly, respectively Connecting each solenoid valve of the first solenoid valve assembly; a controller controlling the first solenoid valve assembly and the pneumatic valve V ^ &gt; 21 丄 W/; opening and closing of the Z42 component; and an analyzer connected to the pipe of the sampling element to analyze the flue gas. 18. The smoke sampling unit of claim 17, wherein the analyzer is coupled to the filter. 19. If the patent application scope is 17 smoke meter sampling units, the controller is a programmable logic controller. 2. The smoke sampling unit of claim 19, wherein the programmable logic controller is externally connected to a computer. 21. The flue gas sampling unit of claim 17, further comprising a heating and thermal insulation component wrapped on the pipe member at the rear end of the filter. 22. The smoke sampling unit of claim 18, wherein a first filter is disposed between the filter and the analyzer. 23. The smoke sampling unit of claim 22, wherein the first filter rear end is connected to a second filter. 24. The smoke sampling unit of claim 17, further comprising a second solenoid valve assembly, each solenoid valve of the second solenoid valve assembly being coupled to each sampling element. 25. The flue gas sampling unit of claim 24, further comprising an air supply source coupled to the pneumatic valve assembly. a method for sampling a flue gas of a flue gas sampling unit, comprising: providing a plurality of sampling elements to the first heat exchanger and the second heat exchanger; and starting each solenoid valve assembly corresponding to the plurality of sampling elements; Start sampling of each pneumatic valve assembly corresponding to the solenoid valve assembly S &gt; 22 1337242 Gas; filtering the flue gas; and analyzing the flue gas. 27. The method of sampling smoke as recited in claim 26, further comprising the step of injecting an air from the pneumatic valve assembly through the solenoid valve assembly to the sampling element for cleaning. 28. The method of sampling a flue gas according to claim 26, wherein the step of activating each solenoid valve assembly and each of the pneumatic valve assemblies further comprises: activating a first solenoid valve assembly and a first pneumatic valve The assembly, at intervals, closes the first solenoid valve assembly and the first pneumatic valve assembly, and activates a second solenoid valve assembly and a second pneumatic valve assembly, thereby sequentially opening/closing each solenoid valve assembly and Each pneumatic valve assembly causes each sampling element to sample flue gas from the first heat exchanger and the second heat exchanger; and activate all solenoid valve assemblies and all pneumatic valve assemblies such that each sampling element is simultaneously The first heat exchanger and the second heat exchanger are sampled with flue gas. 29. The method of sampling a smoke according to claim 26, wherein the step of activating each solenoid valve assembly and each of the pneumatic valve assemblies further comprises: activating a first solenoid valve assembly and a first pneumatic valve assembly, Separating the first solenoid valve assembly and the first pneumatic valve assembly at a certain time, and starting a second solenoid valve assembly and a second pneumatic valve assembly, thus sequentially opening/closing each solenoid valve assembly and each Pneumatic 23 1337242 a valve assembly that causes each sampling element to sample flue gas from the first heat exchanger; activate all solenoid valve assemblies and all of the pneumatic valve assemblies such that each sampling element simultaneously samples flue gas in the first heat exchanger; a seventh solenoid valve assembly and a seventh pneumatic valve assembly are spaced apart for a period of time to close the seventh solenoid valve assembly and the seventh pneumatic valve assembly, and activate an eighth solenoid valve assembly and an eighth pneumatic valve assembly. Sequentially activating/deactivating each solenoid valve assembly and each pneumatic valve assembly such that each sampling element samples flue gas from the second heat exchanger; and activates all solenoid valve assemblies and all pneumatic valve assemblies to each A sampling element simultaneously samples the flue gas in the second heat exchanger. 30. The method for sampling smoke according to claim 27, further comprising: activating a first solenoid valve assembly and a first pneumatic valve assembly, and closing the first solenoid valve assembly with the interval a first pneumatic valve assembly, and a second solenoid valve assembly and a second pneumatic valve assembly® are activated to sequentially activate/deactivate each solenoid valve assembly and each pneumatic valve assembly to clean each sampling element; And starting a seventh solenoid valve assembly and a seventh pneumatic valve assembly, closing the seventh solenoid valve assembly and the seventh pneumatic valve assembly at intervals, and starting an eighth solenoid valve assembly and an eighth pneumatic valve assembly Thus, each solenoid valve assembly and each pneumatic valve assembly are sequentially activated/closed to clean each sampling element. 31. A method for sampling smoke as described in claim 28, wherein 24 &lt; 5 &gt; 1337242 This f is 15 minutes apart. 32=ι^Patent &amp; A method for sampling smoke as described in item 29, wherein 33:: the time is 15 minutes. See 5 for the smoke sampling method described in item 30 of the patent scope, in which the time is 30 seconds. 25