Flue gas sampling and analyzing system for thermal power plant

Abstract

The invention provides a flue gas sampling and analyzing system for a thermal power plant, and relates to the technical field of flue gas sampling and detecting devices.The flue gas sampling and analyzing system comprises a supporting frame, a condensing device and an analyzing device are arranged on the supporting frame, a sampling device is arranged at a gas inlet of the condensing device, the analyzing device is communicated with the condensing device through a gas conveying pipe, and a first switch valve is arranged on the gas conveying pipe; the supporting frame supports the condensing device and the analyzing device, the sampling device extracts, samples and conveys discharged flue gas into the condensing device, uniform sampling of the flue gas is guaranteed, and the condensing device condenses and dehydrates the flue gas so as to eliminate the influence of water vapor in the flue gas on subsequent analysis. After the flue gas is dehydrated, the switch valve I is opened, the flue gas is conveyed into the analysis device through the gas conveying pipe to be subjected to high-precision analysis and detection, the flue gas is discharged after being analyzed and detected by the analysis device, and the system is uniform in flue gas sampling, can intuitively analyze the flue gas, is simple in operation process, and meets the requirements of a modern thermal power plant on flue gas sampling and analysis.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas sampling and detection devices, and in particular to a flue gas sampling and analysis system for a thermal power plant. Background Art

[0002] With the acceleration of global industrialization and the continuous growth of energy consumption, environmental issues have become increasingly prominent, especially air pollution has become the focus of global attention. Flue gas is one of the main pollutants emitted in industrial production and energy utilization. Its composition is complex, including particulate matter, sulfur dioxide, ammonia oxides, volatile organic compounds (VOCs) and heavy metals, which pose a serious threat to air quality, ecological environment and even human health. Therefore, flue gas sampling and analysis is an important part of environmental monitoring and governance.

[0003] Traditional flue gas sampling and analysis systems have problems such as uneven sampling, low analysis accuracy, and complex operation, which makes it difficult to meet the needs of modern thermal power plants for accurate monitoring of flue gas emissions. Therefore, it is particularly important to develop an efficient, accurate, and easy-to-operate flue gas sampling and analysis system. Summary of the invention

[0004] The invention provides a flue gas sampling and analysis system for a thermal power plant, which is used to solve the defects in the prior art.

[0005] The present invention provides a flue gas sampling and analysis system for a thermal power plant, comprising: a support frame, on which a condensing device and an analyzing device are respectively arranged, the sampling device is arranged at the air inlet of the condensing device, the analyzing device is connected with the condensing device through an air pipe, and a switch valve is arranged on the air pipe.

[0006] Preferably, the sampling device comprises an air inlet pipe, an air inlet port 1 and an air outlet 1 are provided in the air inlet pipe, the air outlet 1 is connected with the condensing device, a fixing plate is provided at the air outlet, a protection frame is provided in the air inlet pipe, a left end of the protection frame is connected with the outside, a rotating shaft 1 is rotatably provided between an inner wall of the protection frame and the fixing plate, a spur gear 1 is fixedly provided on the rotating shaft 1 in the protection frame, a fan is fixedly provided on the rotating shaft 1 between the protection frame and the fixing plate, a motor 1 is provided on the outer wall of the air inlet pipe, a rotating shaft 1 is provided at the output end of the motor 1 via a coupling, spur gear 2 is fixedly provided on the rotating shaft 1, the spur gear 1 and the spur gear 2 are connected by a belt 1, a limiting plate is provided on the outer side of the air inlet pipe, one end of a rotating pin is rotatably provided on the limiting plate, a sealing plate 1 is inserted in the air inlet pipe, and one end of the sealing plate 1 is fixedly connected to the other end of the rotating pin.

[0007] Preferably, the condensation device includes a condensation box, a bottom of the condensation box is provided with two air inlets, a top of the condensation box is provided with two air outlets, the two air inlets are connected to the sampling device, an inner condensation tube and an outer condensation tube are arranged in the condensation box, the inner condensation tube is arranged in the top wall of the condensation box, both ends of the inner condensation tube are provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet extend out of the condensation box, a liquid exchange pump is arranged at the liquid outlet, the outer condensation tube is arranged in the condensation box, the inner condensation tube is connected to the outer condensation tube, a liquid collecting inclined plate is arranged at the bottom of the condensation box, a liquid collecting trough is arranged at the lowest point of the liquid collecting inclined plate, a liquid separator plate is arranged on the inner wall of the condensation box, and a drain valve is arranged between the bottom of the liquid separator plate and the liquid collecting inclined plate.

[0008] Preferably, a separation unit is provided on the second air outlet, and the separation unit includes a conical wall, and the conical wall is fixedly provided on the second air outlet, and a fixed block is provided on the inner wall of the top of the conical wall, and an isolation box is provided on the side wall of the condensation box corresponding to the bottom of the second air outlet, and the right end of the isolation box is connected to the outside world, and a rotating shaft 2 is rotatably provided between the inner wall of the isolation box and the fixed block, and a spur tooth 3 is fixedly provided on the rotating shaft 2 in the isolation box, and a worm gear is fixedly provided on the rotating shaft 2 between the isolation box and the fixed block, and a motor 2 is provided on the outer wall of the condensation box, and a rotating shaft 2 is provided at the output end of the motor 2 through a coupling, and a spur tooth 4 is fixedly provided on the rotating shaft 2, and the spur tooth 3 and the spur tooth 4 are connected by a belt transmission.

[0009] Preferably, the analysis device includes a gas collecting box, an exhaust pipe is provided at the bottom of the gas collecting box, an oxygen concentration detector, a sulfur dioxide detector and a nitrogen compound detector are provided in the gas collecting box, and a switch valve 2 is provided on the exhaust pipe.

[0010] Preferably, it also includes:

[0011] Temperature measurement module 1, used to measure the temperature of the flue gas at the air inlet pipe;

[0012] Temperature measurement module 2, used to measure the temperature value of liquefied water vapor in the liquid collecting tank;

[0013] The velocity measurement module 1 is used to measure the flow velocity of the condensate in the condensation inner tube;

[0014] The velocity measurement module 1 is used to measure the flow velocity of the condensate in the condensation outer tube;

[0015] A power detection module is used to measure the real-time power value of the liquid exchange pump when it is working normally;

[0016] An alarm module, used for issuing an alarm;

[0017] The calculation module 1 is used to calculate the theoretical growth temperature of the condensate based on the temperature value of the flue gas at the air inlet pipe and the temperature value of the liquefied water vapor in the liquid collecting tank;

[0018] The calculation module 2 is used to calculate the theoretical power value of the liquid exchange pump based on the theoretical growth temperature of the condensate, the flow rate value of the condensate in the condensate inner tube, and the flow rate value of the condensate in the condensate outer tube calculated by the calculation module 1;

[0019] A processing module, used for comparing the real-time power value of the liquid exchange pump when it is working normally with the theoretical power value of the liquid exchange pump obtained by the calculation module 2;

[0020] The control module, when the real-time power value measured when the liquid exchange pump is working normally is less than the theoretical power value of the liquid exchange pump, the equipment works normally. When the real-time power value measured when the liquid exchange pump is working normally is greater than or equal to the theoretical power value of the liquid exchange pump, the control alarm module sounds an alarm and stops the system at the same time.

[0021] Preferably, the calculation module 1 calculates based on the following formula 1:

[0022]

[0023] T1 is the temperature of the flue gas at the inlet pipe, T2 is the temperature of the liquefied water vapor in the collecting tank, T3 is the theoretical growth temperature of the condensate, γ1 is the heat transfer coefficient on the flue gas side, β1 is the ratio of the inner surface area of ​​the condenser box convection heat transfer to the inner surface of the condenser inner tube convection heat transfer, ε is the thermal conductivity of the condenser outer tube, β2 is the ratio of the outer surface area of ​​the condenser outer tube convection heat transfer to the inner surface, γ2 is the side heat release coefficient of the condensate, and ∈ is the wall thickness of the condenser outer tube;

[0024] The calculation module 2 is calculated based on the following formula 2:

[0025]

[0026] P is the theoretical power value of the liquid exchange pump, ρ is the density of the condensate, C is the specific heat capacity of the condensate, v1 is the flow rate of the condensate in the condensate inner tube, v2 is the flow rate of the condensate in the condensate outer tube, μ is the efficiency of the liquid exchange pump, H1 is the enthalpy value of the condensate at the inlet temperature, H2 is the enthalpy value of the condensate at the outlet temperature, Re is the Reynolds coefficient of the condensate, Pr is the Prandtl number of the condensate, τ is the dynamic viscosity of the fluid, τ w is the dynamic viscosity of the condensate, and g is the acceleration due to gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0029] Figure 2 is an overall cross-sectional schematic diagram provided by an embodiment of the present invention;

[0030] Figure 3 yes Figure 2 Schematic diagram of the structure of part A.

[0031] Reference numerals:

[0032] 1. Support frame; 2. Sampling device; 21. Air inlet pipe; 22. Fixed plate; 23. Protective frame; 24. Rotating shaft 1; 241. Straight tooth 1; 242. Fan; 25. Motor 1; 251. Rotating shaft 1; 252. Straight tooth 2; 26. Belt 1; 27. Limiting plate; 28. Sealing plate 1; 29. ​​Rotating pin; 3. Condensation device; 31. Condensation box; 32. Condensation inner tube; 321. Liquid inlet; 322. Liquid outlet; 323. Liquid exchange pump; 33. Condensation outer tube; 34. Liquid collecting inclined plate; 35. Liquid collecting tank; 36. separator plate; 37. steam trap; 38. separation unit; 381. conical wall; 382. fixing block; 383. belt 2; 384. isolation box; 385. rotating shaft 2; 3851. straight tooth 3; 386. worm gear; 387. motor 2; 3871. rotating shaft 2; 3872. straight tooth 4; 4. analysis device; 41. gas collecting box; 42. exhaust pipe; 43. oxygen concentration detector; 44. sulfur dioxide detector; 45. nitrogen detector; 46. switch valve 2; 5. gas pipeline; 6. switch valve 1. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides the following embodiments

[0036] Example 1

[0037] The embodiment of the present invention provides a flue gas sampling and analysis system for a thermal power plant, such as Figure 1 As shown, it includes: a support frame 1, on which a condensing device 3 and an analyzing device 4 are respectively arranged, the air inlet of the condensing device 3 is provided with the sampling device 2, the analyzing device 4 is connected with the condensing device 3 through an air pipe 5, and a switch valve 6 is arranged on the air pipe 5.

[0038] The working principle and beneficial effects of the above technical solution are as follows: the support frame 1 supports the condensing device 3 and the analyzing device 4, the sampling device 2 extracts and samples the exhausted flue gas and transports it to the condensing device 3, thereby ensuring uniform sampling of the flue gas; the condensing device 3 condenses and dehydrates the flue gas to eliminate the influence of water vapor in the flue gas on subsequent analysis; after the flue gas is dehydrated, the switch valve 6 is opened and the flue gas is transported to the analyzing device 4 through the gas pipe 5 for high-precision analysis and detection; after the analysis and detection of the flue gas is completed, the analyzing device 4 discharges the flue gas to the next process; the system samples the flue gas uniformly, can analyze the flue gas intuitively, and has a simple operation process, thus meeting the needs of modern thermal power plants for flue gas sampling and analysis.

[0039] Example 2

[0040] On the basis of Example 1, Figure 1-Figure 3As shown, the sampling device 2 includes an air inlet pipe 21, an air inlet port 1 and an air outlet port 1 are provided in the air inlet pipe 21, the air outlet port 1 is connected to the condensing device 3, a fixing plate 22 is provided at the air outlet, a protection frame 23 is provided in the air inlet pipe 21, the left end of the protection frame 23 is connected to the outside, a rotating shaft 24 is rotatably provided between the inner wall of the protection frame 23 and the fixing plate 22, a straight tooth 241 is fixedly provided on the rotating shaft 24 in the protection frame 23, and a The fan 242 is provided with a motor 25 on the outer wall of the air inlet pipe 21, and a rotating shaft 251 is provided at the output end of the motor 25 via a coupling, and a spur tooth 252 is fixedly provided on the rotating shaft 251, and the spur tooth 241 and the spur tooth 252 are connected by a belt 26. A limiting plate 27 is provided on the outer side of the air inlet pipe 21, and one end of a rotating pin 29 is rotatably provided on the limiting plate 27. A sealing plate 28 is inserted into the air inlet pipe 21, and one end of the sealing plate 28 is fixedly connected to the other end of the rotating pin 29.

[0041] The working principle and beneficial effects of the above technical solution are as follows: the smoke is sucked into the condensing device 3 from the air inlet 1, the air inlet pipe 21 fixes the protection frame 23 and the fixing plate 22, the protection frame 23 and the fixing plate 22 rotate and fix the rotating shaft 1 24, the motor 1 25 drives the rotating shaft 1 251 to rotate, the rotating shaft 1 251 drives the straight tooth 2 252 to rotate synchronously, the straight tooth 252 drives the straight tooth 1 241 and the rotating shaft 1 24 to rotate synchronously through the belt 1 26, the rotating shaft 1 24 drives the fan 242 to rotate, and the fan 242 generates suction to move the smoke It is sucked into the air inlet pipe 21 and then enters the condensing device 3. The air inlet pipe 21 fixes the limiting plate 27, and the limiting plate 27 rotationally limits the rotating pin 29. The sealing plate 28 is fixedly connected to the rotating pin 29. When it is necessary to sample the flue gas, the sealing plate 28 can be rotated to the outside of the air inlet pipe 21 to keep the air inlet pipe 21 unobstructed. When sampling is not needed, the sealing plate 28 can be rotated to be inserted into the air inlet pipe 21 to close the air inlet pipe 21 to prevent the entry of flue gas.

[0042] Example 3

[0043] On the basis of Example 2, Figure 1-Figure 3As shown, the condensation device 3 includes a condensation box 31, the bottom of the condensation box 31 is provided with an air inlet 2, the top of the condensation box 31 is provided with an air outlet 2, the air inlet 2 is connected to the sampling device 2, the condensation box 31 is provided with an inner condensation tube 32 and an outer condensation tube 33, the inner condensation tube 32 is provided in the top wall of the condensation box 31, and the two ends of the inner condensation tube 32 are provided with a liquid inlet 321 and a liquid outlet 322, the liquid inlet 321 and the liquid outlet 32 2 extends out of the condensation box 31, a liquid replacement pump 323 is provided at the liquid outlet 322, the condensation outer tube 33 is provided in the condensation box 31, the condensation inner tube 32 is communicated with the condensation outer tube 33, a liquid collecting inclined plate 34 is provided at the bottom of the condensation box 31, a liquid collecting tank 35 is provided at the lowest point of the liquid collecting inclined plate 34, a liquid separation plate 36 is provided on the inner wall of the condensation box 31, and a steam trap 37 is provided between the bottom of the liquid separation plate 36 and the liquid collecting inclined plate 34.

[0044] The working principle and beneficial effects of the above technical solution are as follows: the sampled flue gas enters the condensation box 31 from the air inlet pipe 21 in the sampling device 2 through the air inlet 2 at the bottom of the condensation box 31, the inner wall of the condensation box 31 fixes the condensation inner tube 32, and the condensation inner tube 32 supports and fixes the condensation outer tube 33, and the condensate enters the condensation inner tube 32 and the condensation outer tube 33 from the liquid inlet 321, absorbs heat and cools the flue gas in the condensation box 31, and most of the water vapor in the flue gas is cooled and liquefied and falls onto the liquid collecting inclined plate 34, and part of the water vapor floating in the flue gas hits the liquid separator 36 and falls vertically along the liquid separator 36 to the liquid collecting inclined plate 34, and the liquefied water vapor is collected by the liquid collecting inclined plate 34, and then falls into the liquid collecting tank 35 through the steam trap 37 for centralized treatment, which not only removes the water vapor in the flue gas to prevent the water vapor from affecting the detection of the flue gas, but also transfers the heat for recycling and reuse, and can also prevent a large amount of heat from being discharged into the air and affecting the environment.

[0045] Example 4

[0046] On the basis of Example 3, Figure 1-Figure 3As shown, a separation unit 38 is provided on the second air outlet, and the separation unit 38 includes a conical wall 381, and the conical wall 381 is fixedly provided on the second air outlet. A fixing block 382 is provided on the inner wall of the top of the conical wall 381, and an isolation box 384 is provided on the side wall of the condensation box 31 corresponding to the bottom of the second air outlet. The right end of the isolation box 384 is connected to the outside, and a second rotating shaft 385 is rotatably provided between the inner wall of the isolation box 384 and the fixing block 382. A straight tooth three 3851 is fixedly provided on the rotating shaft 385, a worm gear 386 is fixedly provided on the rotating shaft 385 between the isolation box 384 and the fixed block 382, ​​a motor 2 387 is provided on the outer wall of the condensing box 31, a rotating shaft 2 3871 is provided on the output end of the motor 387 via a coupling, a straight tooth four 3872 is fixedly provided on the rotating shaft 3871, and the straight tooth three 3851 and the straight tooth four 3872 are connected via a belt 2 383 for transmission.

[0047] The working principle and beneficial effects of the above technical solution are as follows: the separation unit 38 performs secondary gas-liquid separation on the condensed flue gas, the condensation box 31 fixes the isolation box 384 and the fixed block 382, ​​the isolation box 384 and the fixed block 382 rotate and fix the rotating shaft 2 385, the motor 2 387 drives the rotating shaft 2 3871 to rotate, the rotating shaft 2 3871 drives the straight tooth 4 3872 to rotate synchronously, the straight tooth 4 3872 drives the straight tooth 3 3851 and the rotating shaft 2 385 to rotate synchronously through the belt 2 383, the rotating shaft 2 385 drives the worm gear 386 to rotate, the worm gear 386 generates suction to suck the flue gas into the conical wall 381, the worm gear 386 generates vortex when rotating, the generated vortex separates the flue gas and water vapor, the flue gas is sucked away, and the water vapor condenses and hits the inner wall of the conical structure of the conical wall 381, slides down and falls into the liquid collecting tank 35 below.

[0048] Example 5

[0049] On the basis of Example 4, Figure 1-Figure 3 As shown, the analysis device 4 includes a gas collecting box 41, an exhaust pipe 42 is arranged at the bottom of the gas collecting box 41, an oxygen concentration detector 43, a sulfur dioxide detector 44, and a nitrogen compound detector 45 are arranged in the gas collecting box 41, and a switch valve 46 is arranged on the exhaust pipe 42.

[0050] The working principle and beneficial effects of the above technical solution are as follows: after the condensing device 3 processes the water vapor in the flue gas, it is transported to the gas collecting box 41 through the gas pipe 5, the switch valve 1 6 and the switch valve 2 46 are closed, and the oxygen concentration detector 43, sulfur dioxide detector 44, and nitrogen oxide detector 45 arranged in the gas collecting box 41 respectively analyze multiple indicators of the flue gas. When the analysis is completed, the switch valve 2 46 is opened to discharge and collect the analyzed flue gas.

[0051] Example 6

[0052] On the basis of Example 5, the present invention further comprises:

[0053] Temperature measurement module 1, used to measure the temperature of the flue gas at the air inlet pipe 21;

[0054] Temperature measurement module 2, used to measure the temperature of liquefied water vapor in the liquid collecting tank 35;

[0055] The velocity measurement module 1 is used to measure the flow velocity of the condensate in the condensation inner tube 32;

[0056] The velocity measurement module 1 is used to measure the flow velocity of the condensate in the condensation outer tube 33;

[0057] A power detection module, used to measure the real-time power value of the liquid exchange pump 323 when it works normally;

[0058] An alarm module, used for issuing an alarm;

[0059] The calculation module 1 is used to calculate the theoretical growth temperature of the condensate based on the temperature value of the flue gas at the air inlet pipe 21 and the temperature value of the liquefied water vapor in the liquid collecting tank 35;

[0060] The calculation module 2 is used to calculate the theoretical power value of the liquid exchange pump 323 based on the theoretical growth temperature of the condensate, the flow rate of the condensate in the condensate inner tube 32, and the flow rate of the condensate in the condensate outer tube 33 calculated by the calculation module 1;

[0061] A processing module, used for comparing the real-time power value of the liquid exchange pump 323 when it works normally with the theoretical power value of the liquid exchange pump 323 obtained by the calculation module 2;

[0062] The control module, when the real-time power value measured when the liquid exchange pump 323 is working normally is less than the theoretical power value of the liquid exchange pump 323, the equipment works normally. When the real-time power value measured when the liquid exchange pump 323 is working normally is greater than or equal to the theoretical power value of the liquid exchange pump 323, the control alarm module sounds an alarm and stops the system at the same time.

[0063] The working principle and beneficial effects of the above technical solution are as follows: the temperature measurement module 1 measures the temperature value of the flue gas at the air inlet pipe 21, the temperature measurement module 2 measures the temperature value of the liquefied water vapor in the liquid collecting tank 35, the speed measurement module 1 measures the flow rate value of the condensate in the condenser inner tube 32, the speed measurement module 1 measures the flow rate value of the condensate in the condenser outer tube 33, the power detection module measures the real-time power value of the liquid exchange pump 323 when it works normally, the alarm module is used to issue an alarm, the calculation module 1 calculates the theoretical growth temperature of the condensate based on the temperature value of the flue gas at the air inlet pipe 21 and the temperature value of the liquefied water vapor in the liquid collecting tank 35, and the calculation module 2 ... condensate calculated by the calculation module 1 The theoretical power value of the liquid exchange pump 323 is calculated based on the theoretical growth temperature, the flow rate of the condensate in the condenser inner tube 32, and the flow rate of the condensate in the condenser outer tube 33. The processing module compares the real-time power value of the liquid exchange pump 323 when it is working normally with the theoretical power value of the liquid exchange pump 323 obtained by the calculation module 2. When the real-time power value of the liquid exchange pump 323 when it is working normally is less than the theoretical power value of the liquid exchange pump 323, the equipment is working normally. When the real-time power value of the liquid exchange pump 323 when it is working normally is greater than or equal to the theoretical power value of the liquid exchange pump 323, the control module controls the alarm module to sound an alarm, and the control module system stops operating for maintenance.

[0064] Example 7

[0065] Based on Example 6, the calculation module 1 calculates based on the following formula 1:

[0066]

[0067] T1 is the temperature of the flue gas at the inlet pipe 21, T2 is the temperature of the liquefied water vapor in the collecting tank 35, T3 is the theoretical growth temperature of the condensate, γ1 is the heat transfer coefficient on the flue gas side, β1 is the ratio of the inner surface area of ​​the condenser box 31 to the inner surface of the condenser inner tube 32, ε is the thermal conductivity of the condenser outer tube 33, β2 is the ratio of the outer surface area of ​​the condenser outer tube 33 to the inner surface, γ2 is the side heat release coefficient of the condensate, and ∈ is the wall thickness of the condenser outer tube 33; the calculation module 2 is calculated based on the following formula 2:

[0068]

[0069] P is the theoretical power value of the liquid exchange pump 323, ρ is the density of the condensate, C is the specific heat capacity of the condensate, v1 is the flow rate of the condensate in the condensate inner tube 32, v2 is the flow rate of the condensate in the condensate outer tube 33, μ is the efficiency of the liquid exchange pump 323, H1 is the enthalpy value corresponding to the temperature of the condensate at the liquid inlet 321, H2 is the enthalpy value corresponding to the temperature of the condensate at the liquid outlet 322, Re is the Reynolds coefficient of the condensate, Pr is the Prandtl number of the condensate, τ is the dynamic viscosity of the fluid, τ wis the dynamic viscosity of the condensate, and g is the acceleration due to gravity.

[0070] The working principle and beneficial effects of the above technical solution are: Calculate the theoretical growth temperature of the condensate by Calculate the theoretical power value of the liquid exchange pump 323, and compare the real-time power value of the liquid exchange pump 323 when it is working normally with the theoretical power value of the liquid exchange pump 323 obtained by the calculation module 2. When the real-time power value of the liquid exchange pump 323 when it is working normally is less than the theoretical power value of the liquid exchange pump, the equipment works normally. When the real-time power value of the liquid exchange pump 323 when it is working normally is greater than or equal to the theoretical power value of the liquid exchange pump 323, the control alarm module sounds an alarm and stops the system at the same time.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flue gas sampling and analysis system for a thermal power plant, characterized in that: include: A support frame (1), wherein a condensing device (3) and an analyzing device (4) are respectively arranged on the support frame (1), the sampling device (2) is arranged at the air inlet of the condensing device (3), the analyzing device (4) is connected to the condensing device (3) via an air supply pipe (5), and a switch valve (6) is arranged on the air supply pipe (5).

2. A flue gas sampling and analysis system for a thermal power plant according to claim 1, characterized in that: The sampling device (2) comprises an air inlet pipe (21), an air inlet port 1 and an air outlet port 1 are provided in the air inlet pipe (21), the air outlet port 1 is communicated with the condensing device (3), a fixing plate (22) is provided at one of the air outlets, a protection frame (23) is provided in the air inlet pipe (21), the left end of the protection frame (23) is communicated with the outside, a rotating shaft 1 (24) is rotatably provided between the inner wall of the protection frame (23) and the fixing plate (22), a spur gear 1 (241) is fixedly provided on the rotating shaft 1 (24) in the protection frame (23), and a fan (24) is fixedly provided on the rotating shaft 1 (24) between the protection frame (23) and the fixing plate (22). 242), a motor (25) is arranged on the outer wall of the intake pipe (21), a rotating shaft (251) is arranged at the output end of the motor (25) via a coupling, a straight tooth (252) is fixedly arranged on the rotating shaft (251), the straight tooth (241) and the straight tooth (252) are connected via a belt (26), a limit plate (27) is arranged on the outer side of the intake pipe (21), one end of a rotating pin (29) is rotatably arranged on the limit plate (27), a sealing plate (28) is inserted into the intake pipe (21), one end of the sealing plate (28) is fixedly connected to the other end of the rotating pin (29).

3. A flue gas sampling and analysis system for a thermal power plant according to claim 1, characterized in that: The condensation device (3) comprises a condensation box (31), the bottom of the condensation box (31) is provided with an air inlet 2, the top of the condensation box (31) is provided with an air outlet 2, the air inlet 2 is connected to the sampling device (2), an inner condensation tube (32) and an outer condensation tube (33) are arranged in the condensation box (31), the inner condensation tube (32) is arranged in the top wall of the condensation box (31), and both ends of the inner condensation tube (32) are provided with a liquid inlet (321) and a liquid outlet (322), the liquid inlet (321) and the liquid outlet (322) extend outward. A liquid exchange pump (323) is arranged at the liquid outlet (322) outside the condensation box (31), the condensation outer tube (33) is arranged inside the condensation box (31), the condensation inner tube (32) and the condensation outer tube (33) are connected, a liquid collecting inclined plate (34) is arranged at the bottom of the condensation box (31), a liquid collecting trough (35) is arranged at the lowest point of the liquid collecting inclined plate (34), a liquid separation plate (36) is arranged on the inner wall of the condensation box (31), and a drain valve (37) is arranged between the bottom of the liquid separation plate (36) and the liquid collecting inclined plate (34).

4. A flue gas sampling and analysis system for a thermal power plant according to claim 3, characterized in that: A separation unit (38) is provided on the second air outlet, and the separation unit (38) comprises a conical wall (381), the conical wall (381) is fixedly provided on the second air outlet, a fixing block (382) is provided on the inner wall of the top of the conical wall (381), an isolation box (384) is provided on the side wall of the condensation box (31) corresponding to the bottom of the second air outlet, the right end of the isolation box (384) is connected to the outside, a second rotating shaft (385) is rotatably provided between the inner wall of the isolation box (384) and the fixing block (382), and the rotating shaft in the isolation box (384) is arranged to rotate. A spur gear three (3851) is fixedly arranged on the second (385), a worm gear (386) is fixedly arranged on the second rotating shaft (385) between the isolation box (384) and the fixed block (382), a motor two (387) is arranged on the outer wall of the condensing box (31), a rotating shaft two (3871) is arranged on the output end of the motor two (387) through a coupling, a spur gear four (3872) is fixedly arranged on the rotating shaft two (3871), and the spur gear three (3851) and the spur gear four (3872) are connected by a belt two (383) for transmission.

5. A flue gas sampling and analysis system for a thermal power plant according to claim 4, characterized in that: The analysis device (4) comprises a gas collecting box (41), an exhaust pipe (42) is arranged at the bottom of the gas collecting box (41), an oxygen concentration detector (43), a sulfur dioxide detector (44), and a nitrogen compound detector (45) are arranged in the gas collecting box (41), and a switch valve (46) is arranged on the exhaust pipe (42).

6. A flue gas sampling and analysis system for a thermal power plant according to claim 5, characterized in that: Also includes: Temperature measurement module 1, used for measuring the temperature value of the flue gas at the air inlet pipe (21); Temperature measurement module 2, used for measuring the temperature value of liquefied water vapor in the liquid collecting tank (35); A velocity measurement module 1, used for measuring the flow velocity of the condensate in the condensation inner tube (32); A velocity measurement module 1, used for measuring the flow velocity of the condensate in the condensation outer tube (33); A power detection module, used to measure the real-time power value of the liquid exchange pump (323) when it is working normally; An alarm module, used for issuing an alarm; A calculation module 1, used for calculating the theoretical growth temperature of the condensate based on the temperature value of the flue gas at the air inlet pipe (21) and the temperature value of the liquefied water vapor in the liquid collecting tank (35); A calculation module 2 is used to calculate a theoretical power value of the liquid exchange pump (323) based on the theoretical growth temperature of the condensate, the flow rate value of the condensate in the condensate inner tube (32), and the flow rate value of the condensate in the condensate outer tube (33) calculated by the calculation module 1; A processing module, used for comparing the real-time power value of the liquid exchange pump (323) when it is working normally with the theoretical power value of the liquid exchange pump (323) obtained by the calculation module 2; The control module is configured to control the alarm module to sound an alarm and stop the system operation when the real-time power value of the liquid exchange pump (323) when the liquid exchange pump (323) is measured to be less than the theoretical power value of the liquid exchange pump (323) when the liquid exchange pump (323) is working normally. When the real-time power value of the liquid exchange pump (323) when the liquid exchange pump (323) is measured to be greater than or equal to the theoretical power value of the liquid exchange pump (323) when the liquid exchange pump (323) is working normally, the control alarm module is configured to sound an alarm and stop the system operation at the same time.

7. A flue gas sampling and analysis system for a thermal power plant according to claim 6, characterized in that: The calculation module 1 calculates based on the following formula 1: T1 is the temperature of the flue gas at the air inlet pipe (21), T2 is the temperature of the liquefied water vapor in the liquid collecting tank (35), T3 is the theoretical growth temperature of the condensate, γ1 is the heat transfer coefficient on the flue gas side, β1 is the ratio of the convection heat transfer inner surface area of ​​the condenser box (31) to the convection heat transfer inner surface area of ​​the condenser inner tube (32), ε is the thermal conductivity of the condenser outer tube (33), β2 is the ratio of the convection heat transfer outer surface area to the inner surface of the condenser outer tube (33), γ2 is the side heat release coefficient of the condensate, and ∈ is the tube wall thickness of the condenser outer tube (33); The calculation module 2 is calculated based on the following formula 2: P is the theoretical power value of the liquid exchange pump (323), ρ is the density of the condensate, C is the specific heat capacity of the condensate, v1 is the flow rate of the condensate in the condensate inner tube (32), v2 is the flow rate of the condensate in the condensate outer tube (33), μ is the efficiency of the liquid exchange pump (323), H1 is the enthalpy value corresponding to the temperature of the condensate at the liquid inlet (321), H2 is the enthalpy value corresponding to the temperature of the condensate at the liquid outlet (322), Re is the Reynolds coefficient of the condensate, Pr is the Prandtl number of the condensate, τ is the dynamic viscosity of the fluid, τ w is the dynamic viscosity of the condensate, and g is the acceleration due to gravity.

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