CN114324237B - Ammonia escape detection device and method for flue gas denitration system - Google Patents
Ammonia escape detection device and method for flue gas denitration system Download PDFInfo
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- CN114324237B CN114324237B CN202111585798.7A CN202111585798A CN114324237B CN 114324237 B CN114324237 B CN 114324237B CN 202111585798 A CN202111585798 A CN 202111585798A CN 114324237 B CN114324237 B CN 114324237B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses an ammonia escape detection device and method of a flue gas denitration system, comprising a detector, a conduit assembly and a sampling tube, wherein the sampling tube is internally connected with a drainage assembly, the drainage assembly comprises a fixed plate and an induced draft hood, the fixed plate is arranged in the sampling tube through a rotary fixed assembly, the induced draft hood is arranged on the fixed plate, one side of the induced draft hood is provided with an opening, the fixed plate and the induced draft hood do rotary motion in the sampling tube, the induced draft hood do reciprocating motion on the fixed plate along the direction parallel to the fixed plate, and the conduit assembly comprises an inner tube, an outer tube, a detection tube, a horizontal section, a vertical section and an elbow. The invention can collect the gas in the flue gas pipe everywhere, so that the detector can detect the escaped ammonia concentration in the flue gas pipe more accurately.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to an ammonia escape detection device and method of a flue gas denitration system.
Background
Ammonia slip is a key control parameter for cement kiln flue gas denitration operation. With the common implementation of SNCR and SCR in cement kiln tail flue gas treatment, the problems of ammonia slip and secondary pollution of ammonium sulfite aerosol are generated. The ammonia escapes too high, so that ash accumulation and blockage of downstream equipment, increase of resistance loss and low-temperature corrosion are easily caused; the quality of fly ash is affected, and the problem of pasting bags of the bag-type dust collector is caused. Ammonia slip also affects CEMS monitoring accuracy, such as ammonium salt crystallization plugging of pipes and pollution analysis systems; secondary desulfurization in CEMS to produce SO 2 The test data is low or undetectable. In actual operation, ammonia escape exceeding is often caused by the influence of factors such as denitration catalyst performance, flue gas condition fluctuation, flow field deviation and the like, so that the real-time, online and accurate measurement of the ammonia escape rate is an important guarantee for safe, stable and efficient operation of a denitration deviceAnd (3) barrier.
The existing ammonia escape detection system is mainly used for pseudo-in-situ detection, smoke is sampled out for detection through a sampling tube arranged in a smoke tube, the basic principle is that a specific semiconductor laser is tuned to enable the wavelength to sweep through an absorption spectrum line of detected gas, transmitted light absorbed by the gas is received by a photoelectric detector, harmonic components of the transmitted spectrum are extracted through a phase-locked amplifying module, and concentration information of the gas to be detected is inverted.
In the prior art, a sampling tube of a detector is arranged in a flue gas pipe, a single or opposite-penetrating ammonia meter single-point sampling and measuring scheme is adopted, the diameter of the flue gas pipe is large, escaped ammonia is unevenly distributed in the flue gas pipe, the flue gas sampling representativeness is poor, the deviation of a measuring result is large, and the measured data cannot represent the integral escaped ammonia concentration in the flue gas pipe.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the ammonia escape detection device of the flue gas denitration system, which can collect flue gas at all positions in a sampling tube, so that the detector can detect the escape ammonia concentration in a flue gas tube more accurately, and the data can more indicate the ammonia escape degree.
In order to achieve the above object, the present invention adopts the following technical scheme:
the ammonia escape detection device of the flue gas denitration system comprises a detector, a sampling tube and a conduit assembly, wherein the sampling tube is internally connected with a drainage assembly, the drainage assembly comprises a fixed plate and an induced draft hood, the fixed plate 1 is arranged in the sampling tube through a rotary fixed assembly, the induced draft hood is arranged on the fixed plate, one side of the induced draft hood is provided with an opening, the fixed plate and the induced draft hood do rotary motion in the sampling tube, and the induced draft hood does reciprocating motion on the fixed plate along the direction parallel to the fixed plate; the catheter assembly comprises an inner pipe, an outer pipe, a detection pipe, a horizontal section, a vertical section and an elbow pipe, wherein the inner pipe is fixedly connected to the induced draft hood and communicated with the induced draft hood, the outer pipe is sleeved on the inner pipe, the inner pipe and the outer pipe are all arranged in parallel with the fixing plate, the detection pipe comprises the horizontal section and the vertical section which are mutually communicated, the horizontal section and the rotation axis of the fixing plate are coaxially arranged, the vertical section penetrates through the sampling pipe and is connected with the detector, and the elbow pipe is used for communicating the outer pipe with the detection pipe.
Preferably, the fixed plate and the induced draft shield are driven to rotate by a rotation fixing assembly.
Preferably, the rotary fixing assembly comprises a fixing block, rotary fan blades, a rotating shaft and a plurality of fixing rods, wherein the fixing block is fixedly connected to the center in the sampling tube through the fixing rods, the rotating shaft is rotationally connected to the fixing block, the rotating shaft and the sampling tube are coaxially arranged, one end of the rotating shaft is fixedly connected to the fixing plate, and the rotary fan blades are fixedly connected to the rotating shaft.
Preferably, the air inducing cover is driven to reciprocate by a reciprocating driving assembly, the reciprocating driving assembly comprises a reciprocating screw, a sliding block, a gear ring and two supporting plates, the two supporting plates are fixedly connected to the fixing plate, and the reciprocating screw is rotationally connected to the supporting plates.
Preferably, the sliding block is in threaded connection with the reciprocating screw, the induced draft hood is fixedly connected with the sliding block, the gear ring is fixedly connected with the sampling tube, the gear is fixedly connected with the reciprocating screw, and the gear is meshed with the gear ring.
Preferably, the bent pipe is rotatably connected with the detection pipe through a sealing bearing.
Preferably, the detector is communicated with a booster air pump, and the booster air pump is communicated with the detection tube.
Preferably, the detector is fixedly connected to the sampling tube through a reinforcing plate.
The ammonia escape detection method of the flue gas denitration system comprises the following specific steps: the smoke passes through the sampling tube, the rotary fan blade rotates under the promotion of smoke, thereby drive the fixed plate and rotate, the fixed plate drives the induced draft fan cover and rotates, simultaneously, the fixed plate drives the gear to rotate, the gear drives the reciprocating screw to rotate, the slider is reciprocating motion on the reciprocating screw, so as to drive the induced draft fan cover to reciprocate, the induced draft fan cover drives the inner tube to move, the inner tube moves in the outer tube and keeps communicating with the detection tube through the return bend, the smoke enters the detector through the induced draft fan cover and detects, the detector adopts tunable laser absorption spectrum type to detect, through specific semiconductor laser wavelength, make it sweep the absorption spectrum line of the detected gas, the transmitted light after being absorbed by the gas is received by the photoelectric detector, extract the harmonic component of the transmitted spectrum through the lock-in amplifying module, invert out the gas concentration information that awaits measuring, the induced draft fan cover is reciprocating motion with the fixed plate parallel direction in the rotation in the sampling tube, the flue gas everywhere in the sampling tube can be gathered.
The invention has the advantages that: the invention has reasonable structure, the induced draft hood rotates in the sampling tube and simultaneously makes reciprocating motion with the fixing plate in the parallel direction, so that the flue gas in each part of the sampling tube can be collected, the detector can detect the escaping ammonia concentration in the flue gas tube more accurately, the data can more indicate the ammonia escaping degree, the flue gas rotates in the flue gas tube, the escaping ammonia is distributed more uniformly, and the detecting accuracy of the detector is further improved; through the rotation of the rotating fan blades, the smoke in the smoke pipe is rotated, and escaped ammonia is distributed more uniformly in the smoke pipe.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is a schematic structural view of a rotary fixing assembly and a reciprocating driving assembly according to the present invention.
Meaning of reference numerals in the drawings: 1. a detector; 2. a sampling tube; 3. a drainage assembly; 31. a fixing plate; 32. an induced draft cover; 4. a catheter assembly; 41. an inner tube; 42. an outer tube; 43. a detection tube; 431. a horizontal section; 432. a vertical section; 44. bending the pipe; 5. a rotational fixing assembly; 51. a fixed block; 52. rotating the fan blades; 53 rotation axis; 54. a fixed rod; 6. a reciprocating drive assembly; 61. a reciprocating screw; 62. a slide block; 63. a gear; 64. a gear ring; 65. a support plate; 7. a booster air pump; 8. reinforcing plate.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments.
Referring to fig. 1-3, the ammonia escape detection device of the flue gas denitration system comprises a detector 1, a conduit assembly 4 and a sampling tube 2, wherein a drainage assembly 3 is connected in the sampling tube 2.
The drainage assembly 3 comprises a fixing plate 31 and an induced draft hood 32, wherein the fixing plate 31 is arranged in the sampling tube 2 through the rotary fixing assembly 5, the induced draft hood 32 is arranged on the fixing plate 31, one side of the induced draft hood 32 is provided with an opening, the fixing plate 31 and the induced draft hood 32 are in rotary motion in the sampling tube 2, and the induced draft hood 32 is in reciprocating motion on the fixing plate 31 along the direction parallel to the fixing plate 31.
The catheter assembly 4 comprises an inner tube 41, an outer tube 42, a detection tube 43, a horizontal section 431, a vertical section 432 and an elbow 44, wherein the inner tube 41 is fixedly connected to the induced draft hood 32 and is communicated with the induced draft hood 32, the outer tube 42 is sleeved on the inner tube 41, the inner tube 41 and the outer tube 42 are both arranged in parallel with the fixed plate 31, the detection tube 43 comprises the horizontal section 431 and the vertical section 432 which are mutually communicated, the horizontal section is coaxially arranged with the rotation axis of the fixed plate 31, the vertical section 432 penetrates through the sampling tube 2 and is connected with the detector 1, and the elbow 44 is used for communicating the outer tube 42 with the detection tube 43.
The induced draft hood 32 can collect the gas everywhere in the flue gas pipe, makes detector 1 more accurate to the escape ammonia concentration detection in the flue gas pipe, and the data can more demonstrate the ammonia escape degree, and the flue gas rotates in the flue gas pipe, and escape ammonia distributes more evenly, has further promoted the accuracy that detector 1 detected.
Referring to fig. 3, the fixing plate 31 and the induced draft hood 32 are driven to perform rotational movement by the rotational fixing assembly 5, the rotational fixing assembly 5 includes a fixing block 51, a rotational fan blade 52, a rotational shaft 53 and a plurality of fixing rods 54, the fixing block 51 is fixedly connected to the inner center of the sampling tube 2 by the plurality of fixing rods 54, the rotational shaft 53 is rotatably connected to the fixing block 51, and the rotational shaft 53 is coaxially arranged with the sampling tube 2, one end of the rotational shaft 53 is fixedly connected to the fixing plate 31, and the rotational fan blade 52 is fixedly connected to the rotational shaft 53. The smoke passes through the rotary fan blades 52 at a high speed, the rotary fan blades 52 rotate under the pushing of the smoke, the rotary fan blades 52 drive the rotary shaft 53 to rotate, the rotary shaft 53 drives the fixed plate 31 to rotate, and the fixed plate 31 drives the induced draft cover 32 to rotate.
The induced draft hood 32 is driven to reciprocate by the reciprocating driving assembly 6, the reciprocating driving assembly 6 comprises a reciprocating screw 61, a sliding block 62, a gear 63, a gear ring 64 and two supporting plates 65, the two supporting plates 65 are fixedly connected to the fixed plate 31, the reciprocating screw 61 is rotationally connected to the supporting plates 65, the sliding block 62 is in threaded connection with the reciprocating screw 61, the induced draft hood 32 is fixedly connected to the sliding block 62, the gear ring 64 is fixedly connected to the sampling tube 2, the gear 63 is fixedly connected to the reciprocating screw 61, and the gear 63 is meshed with the gear ring 64.
The fixed plate 31 drives the gear 63 to rotate, the gear 63 rotates when moving on the gear ring 64, the gear 63 drives the reciprocating screw 61 to rotate, the sliding block 62 reciprocates on the reciprocating screw 61, the sliding block 62 drives the induced air cover 32 to reciprocate, the induced air cover 32 drives the inner tube 41 to move, the inner tube 41 moves in the outer tube 42 and is communicated with the detection tube 43 through the bent tube 44, and the bent tube 44 is rotationally connected with the detection tube 43 through a sealed bearing. The bent pipe 44 rotates along with the outer pipe 42, the detection pipe 43 is fixed on the sampling pipe 2, and the bent pipe 44 and the detection pipe 43 are rotationally connected through a sealing bearing, so that the bent pipe 44 can be communicated with the detection pipe 43 when rotating.
The detector 1 is communicated with the booster air pump 7, the booster air pump 7 is communicated with the detection tube 43, and smoke in a smoke tube is extracted in an active mode, so that the sampling effect is better. The detector 1 is fixedly connected to the sampling tube 2 through the reinforcing plate 8, so that the detector 1 is more stable and is not easy to shake.
In order to better illustrate the present invention, the following specifically describes the ammonia slip detection method of the flue gas denitration system:
the smoke tube 2 is arranged on a pipeline, the smoke passes through the smoke tube 2, the smoke passes through the rotary fan blades 52 at a high speed, the rotary fan blades 52 rotate under the pushing of the smoke, the rotary fan blades 52 drive the rotating shaft 53 to rotate, the rotating shaft 53 drives the fixed plate 31 to rotate, the fixed plate 31 drives the induced air cover 32 to rotate, meanwhile, the fixed plate 31 drives the gear 63 to rotate, the gear 63 rotates when moving on the gear ring 64, the gear 63 drives the reciprocating screw 61 to rotate, the sliding block 62 reciprocates on the reciprocating screw 61, the sliding block 62 drives the induced air cover 32 to reciprocate, the induced air cover 32 drives the inner tube 41 to move in the outer tube 42 and keep in communication with the detection tube 43 through the bent tube 44, the smoke enters the detector 1 through the induced air cover 32 to detect, the detector 1 adopts tunable laser absorption spectrum type detection, the wavelength of a specific semiconductor laser is adopted, the detected by sweeping the detected gas absorption spectrum line, the transmitted light after being absorbed by the gas is received by the photoelectric detector, harmonic components of the transmission spectrum are extracted through the amplifying module, the information of the detected gas concentration is inverted, the induced air cover 32 reciprocates in the reciprocating direction of the fixed plate 32 in the smoke tube 2, the smoke tube can be more accurately and can escape to the smoke tube 2 in the direction of the smoke tube, the smoke tube can be more accurately and evenly spread in the smoke tube, and the smoke can be more accurately and more clearly detected in the smoke tube 1 by rotating and more than the smoke tube can be more and more accurately and more clearly and more than the smoke in the smoke tube.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.
Claims (5)
1. The ammonia escape detection device of the flue gas denitration system comprises a detector (1), a sampling tube (2) and a guide tube assembly (4), and is characterized in that a drainage assembly (3) is connected in the sampling tube (2), the drainage assembly (3) comprises a fixing plate (31) and an induced draft cover (32), the fixing plate (31) is arranged in the sampling tube (2) through a rotary fixing assembly (5), the induced draft cover (32) is arranged on the fixing plate (31), one side of the induced draft cover (32) is provided with an opening, the fixing plate (31) and the induced draft cover (32) do rotary motion in the sampling tube (2), and the induced draft cover (32) do reciprocating motion on the fixing plate (31) along the direction parallel to the fixing plate (31); the catheter assembly (4) comprises an inner tube (41), an outer tube (42), a detection tube (43), a horizontal section (431), a vertical section (432) and an elbow (44), wherein the inner tube (41) is fixedly connected to the induced air cover (32) and is communicated with the induced air cover (32), the outer tube (42) is sleeved on the inner tube (41), the inner tube (41) and the outer tube (42) are both arranged in parallel with the fixed plate (31), the detection tube (43) comprises the horizontal section (431) and the vertical section (432) which are mutually communicated, the horizontal section and the rotation axis of the fixed plate (31) are coaxially arranged, the vertical section (432) penetrates through the sampling tube (2) and is connected with the detector (1), and the elbow (44) is used for communicating the outer tube (42) with the detection tube (43);
the rotary fan comprises a fixed plate (31) and a fan cover (32), wherein the fixed plate (31) and the fan cover (32) are driven to do rotary motion through a rotary fixed assembly (5), the rotary fixed assembly (5) comprises a fixed block (51), a rotary fan blade (52), a rotary shaft (53) and a plurality of fixed rods (54), the fixed block (51) is fixedly connected to the inner center of a sampling tube (2) through the plurality of fixed rods (54), the rotary shaft (53) is rotationally connected to the fixed block (51), the rotary shaft (53) and the sampling tube (2) are coaxially arranged, one end of the rotary shaft (53) is fixedly connected to the fixed plate (31), the rotary fan blade (52) is fixedly connected to the rotary shaft (53), the fan cover (32) is driven to do reciprocating motion through a reciprocating driving assembly (6), the reciprocating driving assembly (6) comprises a reciprocating screw (61), a sliding block (62), a gear (63), a gear ring (64) and two supporting plates (65) are fixedly connected to the fixed plate (31), the reciprocating screw (61) is rotationally connected to the supporting plate (65), the sliding block (62) is fixedly connected to the reciprocating screw (62) and the reciprocating screw (32), the gear ring (64) is fixedly connected in the sampling tube (2), the gear (63) is fixedly connected to the reciprocating screw (61), and the gear (63) is meshed with the gear ring (64).
2. The ammonia slip detection device of a flue gas denitrification system according to claim 1, wherein the elbow (44) is rotatably connected with the detection tube (43) through a sealed bearing.
3. The ammonia escape detection device of the flue gas denitration system according to claim 1, wherein a booster air pump (7) is communicated with the detector (1), and the booster air pump (7) is communicated with the detection tube (43).
4. The ammonia escape detection device of a flue gas denitrification system according to claim 1, wherein the detector (1) is fixedly connected to the sampling tube (2) through a reinforcing plate (8).
5. The detection method of an ammonia slip detection device of a flue gas denitration system according to any one of claims 1 to 4, characterized by comprising the following specific steps: the smoke passes through the sampling tube (2), rotatory flabellum (52) rotates under the promotion of flue gas, thereby drive fixed plate (31) and rotate, fixed plate (31) drive induced air cover (32) rotate, simultaneously fixed plate (31) drive gear (63) rotate, gear (63) drive reciprocal lead screw (61) rotate, slider (62) are reciprocating motion on reciprocal lead screw (61), so as to drive induced air cover (32) to do reciprocating motion, induced air cover (32) drive inner tube (41) remove, inner tube (41) remove in outer tube (42) and keep the intercommunication through return bend (44) and detector tube (43), the flue gas passes through induced air cover (32) and gets into detector (1) and detect, detector (1) adopts tunable laser absorption spectrum to detect, through specific semiconductor laser wavelength, make it be surveyed gaseous absorption spectral line, the transmission light after being absorbed by the gas is received by the photoelectric detector, draw the harmonic component of transmission spectrum through the lock-up amplification module, inversion, the gas concentration information that awaits, induced air cover (32) is rotated in sampling tube (2) and fixed plate (31) are in the reciprocating motion of each place of each can be gathered in the parallel.
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| CN202111585798.7A CN114324237B (en) | 2021-12-23 | 2021-12-23 | Ammonia escape detection device and method for flue gas denitration system |
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| CN202111585798.7A CN114324237B (en) | 2021-12-23 | 2021-12-23 | Ammonia escape detection device and method for flue gas denitration system |
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| CN114324237B true CN114324237B (en) | 2023-09-05 |
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| CN114324237A (en) | 2022-04-12 |
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