CN113339828A - Flue gas bypass injection structure under full load operating mode of boiler - Google Patents
Flue gas bypass injection structure under full load operating mode of boiler Download PDFInfo
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- CN113339828A CN113339828A CN202110707767.8A CN202110707767A CN113339828A CN 113339828 A CN113339828 A CN 113339828A CN 202110707767 A CN202110707767 A CN 202110707767A CN 113339828 A CN113339828 A CN 113339828A
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- flue
- flue gas
- guide plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
Abstract
本发明一种锅炉全负荷工况下烟气旁路注入结构，主旁路烟气混合均匀，主烟道新增阻力小；其包括注入口和导流板结构；注入口包括若干并联支路烟道和若干导流槽，导流槽输入端与并联支路烟道输出端一一对应连接；并联支路烟道设置在主烟道外，并联支路烟道输入端与旁路烟道输出端对应连接，各并联支路烟道平行布置；导流槽设置在主烟道内，其自由端延伸至主烟道底部，各导流槽平行布置，导流槽采用直角三角形布置，两个直角边分别对应设置为导流槽输入端与导流槽输出端，导流槽输出端沿主烟道烟气方向布置；导流板结构，设置在主烟道内，包括减阻导流板和扩口导流板，其中减阻导流板为楔形，对应设置在导流槽上游；扩口导流板设置在导流槽下游。
The present invention is a flue gas bypass injection structure under the full load condition of the boiler, the main bypass flue gas is evenly mixed, and the new resistance of the main flue is small; it includes an injection port and a guide plate structure; the injection port includes a plurality of parallel branches The flue and several diversion grooves, the input end of the diversion groove and the output end of the parallel branch flue are connected one by one; the parallel branch flue is arranged outside the main flue, and the input end of the parallel branch flue is connected with the output end of the bypass flue. The ends are connected correspondingly, and each parallel branch flue is arranged in parallel; the diversion groove is arranged in the main flue, and its free end extends to the bottom of the main flue, and the diversion grooves are arranged in parallel. The sides are respectively set as the input end of the diversion slot and the output end of the diversion slot, and the output end of the diversion slot is arranged along the flue gas direction of the main flue; The port guide plate, wherein the drag reduction guide plate is wedge-shaped, is correspondingly arranged upstream of the guide groove; the flared guide plate is arranged downstream of the guide groove.
Description
Technical Field
The invention relates to the field of denitration of boilers, in particular to a flue gas bypass injection structure under a full-load working condition of a boiler.
Background
With the increase of the investment of new energy power generation such as hydropower, wind power, solar power generation and the like, the occupation ratio of thermal power generation in the power industry is reduced year by year, and the thermal power generating unit is gradually changed into a power grid peak shaving power supply from the previous basic load. However, when a large number of existing coal-fired units run at low load, the smoke temperature at a denitration inlet cannot meet the minimum input temperature of an SCR system, so that the low-load NOx emission exceeds the standard, and the deep peak regulation requirement cannot be met. In order to meet the environmental protection requirement and achieve the purpose of flexible peak regulation, related equipment needs to be modified. In the case of a denitration system, the most adopted technical route at present is a high-temperature flue gas bypass modification method.
The design idea of the high-temperature flue gas bypass system is as follows: and a flue gas bypass flue is newly added, high-temperature flue gas is introduced into the denitration inlet flue, and the mixed flue gas meets the input temperature of an SCR system, so that the ultralow emission of NOx is realized. The performance of the denitration catalyst in the SCR system is greatly influenced by the temperature distribution of the flue gas, and the key of the stable operation of the SCR system under the low-load working condition is that whether the high-temperature bypass flue gas and the low-temperature main flue gas can be fully mixed or not.
However, the scheme that the denitration system can stably operate under low load through a bypass flue reforming process in the currently disclosed patent has many defects, and particularly, the design of an injection port at the flue interface of a bypass and a main path lacks theoretical guidance, so that temperature deviation is easily caused when the bypass system is put into operation. Although the scheme of adopting a vortex disc type mixer and the like can promote the mixing of the flue gas to a certain degree, the resistance of the main flue (more than 100 Pa) can be greatly increased, and the economic benefit of the operation of a power plant is directly influenced. .
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a flue gas bypass injection structure under the full-load working condition of a boiler, which has the advantages of reasonable structure, ingenious design, uniform mixing of flue gas of a main flue and flue gas of a bypass, and small newly increased resistance of the main flue.
In order to achieve the purpose, the invention provides the following technical scheme:
a flue gas bypass injection structure under the full-load working condition of a boiler comprises an injection port and a guide plate structure;
the injection port comprises a plurality of parallel branch flues and a plurality of diversion trenches, and the input ends of the diversion trenches are connected with the output ends of the parallel branch flues in a one-to-one correspondence manner; the parallel branch flues are arranged outside the main flue, the input ends of the parallel branch flues are correspondingly connected with the output ends of the bypass flues, and the parallel branch flues are arranged in parallel; the diversion trench is arranged in the main flue, the free end of the diversion trench extends to the bottom of the main flue, the diversion trenches are arranged in parallel, the diversion trenches are arranged in a right-angled triangle, two right-angled sides are respectively and correspondingly arranged as the input end of the diversion trench and the output end of the diversion trench, and the output end of the diversion trench is arranged along the flue gas direction of the main flue;
the flow guide plate structure is arranged in the main flue and comprises a resistance-reducing flow guide plate and a flaring flow guide plate, wherein the resistance-reducing flow guide plate is wedge-shaped and is correspondingly arranged at the upstream of the flow guide groove; the flaring guide plate is arranged at the downstream of the guide groove.
Preferably, the number of the parallel branch flues is 3-6.
Preferably, an adjustable baffle door and a flow measuring point are arranged in the parallel branch flue.
Preferably, a parallel branch flue guide plate is arranged at a corner of the parallel branch flue, and the parallel branch flue guide plate is parallel to the outer contour of the parallel branch flue.
Preferably, the output end of the parallel branch flue is connected with the input end of the diversion trench by a special-shaped piece.
Preferably, the input end of the diversion trench is provided with an input end diversion plate, and the output end of the diversion trench is provided with an output end diversion plate.
Preferably, the main flue gas injection direction is the same as the bypass flue gas injection main flue direction, that is, when injecting in the forward direction, the input guide plate is located in the extending direction of the input end of the diversion trench, and the input guide plate is arranged in parallel with the inclined plane end of the right triangle.
Preferably, when the injection is performed in the forward direction, the anti-drag deflector is arranged at the upstream of the diversion trench without a gap with the diversion trench.
Preferably, the main flue gas injection direction is opposite to the bypass flue gas injection direction, that is, when the main flue gas and the bypass flue gas are injected reversely, the input end guide plate is positioned outside the extension direction of the input end of the guide groove, and the input end guide plate is arranged in parallel with the inclined plane end of the right triangle;
and the output end of the diversion trench is provided with an output end diversion plate, the output end diversion plate is vertically arranged with the output end of the diversion trench, and the output end diversion plates are arranged in parallel.
Preferably, when the reverse injection is carried out, the resistance-reducing guide plate is arranged at the upstream of the guide groove, and a gap exists between the resistance-reducing guide plate and the guide groove.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a flue gas bypass injection structure under the full-load working condition of a boiler, which comprises an injection port, wherein the injection port comprises parallel branch flue gas and a diversion trench, the number of the parallel branch flue gas can be selected according to the width of a flue, the number of the parallel branch flue gas is selected and set according to the actual engineering experience, the flue gas bypass injection structure is suitable for flues with different widths, and the flue gas bypass injection structure is beneficial to uniform mixing in the width direction of the flue gas; the diversion trench is arranged in a right-angled triangle, so that the resistance of the bypass flue gas injected into the main flue through the diversion trench and mixed with the main flue gas can be reduced, and the free end of the diversion trench extends to the bottom of the main flue, thereby being beneficial to uniform mixing of the flue gas in the depth direction; the injection structure also comprises a guide plate structure which comprises a resistance-reducing guide plate and a flaring guide plate, the injection port is used for replacing a conventionally used vortex disc type mixer to inject the bypass flue gas, the injection path of the bypass flue gas is optimized, and the resistance-reducing guide plate arranged at the upstream of the guide groove is matched, so that the newly increased resistance of the main flue gas can be obviously reduced; the downstream of the diversion trench is provided with a flaring diversion plate for regulating the uniform main flue gas and the injected bypass flue gas, so that the mixed whole flue gas is guided, and the cold flue gas and the hot flue gas entering the catalyst are fully mixed.
Furthermore, flow measuring points and adjusting type baffle doors are arranged in the parallel branch flue, the flow state of bypass flue gas can be monitored, flow signals of all branches can be obtained in real time, the opening of the baffle doors is controlled, and the flue gas is fully and uniformly mixed.
Furthermore, a plurality of guide plates are arranged in the parallel branch flue and the guide groove, when the bypass flue gas is injected, the bypass flue gas firstly enters the guide groove through the parallel branch flue and then is mixed with the main flue gas in the main flue, the flue gas injection direction can be adjusted by arranging the guide plates, the flue gas injection path is optimized, the flue gas injection resistance is reduced, the bypass flue gas injection direction is consistent with the direction of the parallel branch flue, and the main flue gas and the bypass flue gas are fully and uniformly mixed.
Furthermore, due to the inclination of the main flue, in order to avoid the risk of dust deposition in the diversion plate groove caused by the inclined flue, when a reverse injection mode is adopted, the bypass flue gas passes through the diversion grooves arranged in a reverse triangle and is reversely mixed with the main flue gas through the gap between the resistance-reducing diversion plate and the diversion grooves.
Drawings
Fig. 1 is a schematic view of an implantation structure (forward implantation) described in example 1 of the present invention.
Fig. 2 is a schematic view of the injection port in example 1 of the present invention.
Fig. 3 is a schematic view of the implantation structure (reverse implantation) described in embodiment 2 of the present invention.
Fig. 4 is a schematic view of the injection port in example 2 of the present invention.
Fig. 5 is a schematic perspective view of the injection structure (reverse injection) in example 2 of the present invention.
In the figure, the injection port 1, the guide plate structure 2, the parallel branch flue 3, the guiding gutter 4, the parallel branch flue guide plate 5, the input end guide plate 10, the output end guide plate 11, the resistance-reducing guide plate 6, the flaring guide plate 7, the main flue 8, the bypass flue 9, the parallel branch flue input end 12, the parallel branch flue output end 13, the guiding gutter input end 14, the guiding gutter output end 15, and the inclined plane end 16.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The arrows in fig. 1 and 3 represent the flow direction of the main flue gas, and the flow direction of the main flue gas is taken as the basis to distinguish upstream and downstream.
As shown in fig. 1 and 2, the present invention comprises an injection port 1 and a baffle structure 2;
the injection port 1 comprises a plurality of parallel branch flues 3 and a plurality of diversion trenches 4, and the input ends 14 of the diversion trenches are correspondingly connected with the output ends 13 of the parallel branch flues one by one; the parallel branch flues 3 are arranged outside the main flues 8, the input ends 12 of the parallel branch flues are correspondingly connected with the output ends of the bypass flues, and the parallel branch flues are arranged in parallel; the diversion trench 4 is arranged in the main flue 8, the free end of the diversion trench extends to the bottom of the main flue, the diversion trenches are arranged in parallel, the diversion trench 4 is arranged in a right-angled triangle, two right-angled sides are respectively and correspondingly arranged as a diversion trench input end 14 and a diversion trench output end 15, and the diversion trench output end 15 is arranged along the flue gas direction of the main flue;
as shown in figure 5, parallel branch flues 3 and diversion trenches 4 correspondingly connected with the parallel branch flues are arranged in parallel, and input ends 12 of the parallel branch flues are connected together, so that the whole structure of the injection port is distributed in a claw shape, the number of the parallel branch flues can be selected according to the width of the flues, and 3-6 parallel branch flues are preferably arranged under the claw shape according to the practical experience of engineering of 300MW and 600MW units, thereby being beneficial to uniform mixing of the flues in the depth direction.
As shown in fig. 2 and 4, the diversion trench 4 of the invention adopts right-angled triangle arrangement to replace the conventional rectangular structure, which can reduce the resistance when the bypass flue gas is injected into the main flue 8 through the diversion trench 4 and is mixed with the main flue gas, and the free end of the diversion trench extends to the bottom of the main flue, so that the bypass flue gas and the main flue gas can be fully mixed.
As shown in fig. 3, the baffle structure 2 is disposed in the main flue 8, and includes a resistance-reducing baffle 6 and a flaring baffle 7, wherein the resistance-reducing baffle 6 is wedge-shaped, disposed upstream of the baffle groove 4, and spaced along the width direction of the main flue; the flaring guide plate 7 is arranged at the downstream of the guide groove 4, and the flaring guide plate 7 and the side surface of the main flue form an included angle.
The injection port 1 is used for replacing a conventional vortex disc type mixer to inject the bypass flue gas, the injection path of the bypass flue gas is optimized, and the newly increased resistance of the main flue gas can be obviously reduced by matching with the resistance-reducing guide plate 6 arranged at the upstream of the guide groove 4.
The flaring guide plate 7 is arranged at the downstream of the guide groove 4, and the main flue at the flaring part has reducing diameter and is arranged at an included angle with the side edge of the main flue, so that the main flue and the injected bypass flue are adjusted to be uniform, the whole flue after mixing is guided, and the cold flue and the hot flue entering the catalyst are fully mixed.
Preferably, the adjustable baffle door and the flow measurement point are arranged in the parallel branch flue 3, the flow state of bypass flue gas can be monitored, the flow signal of each branch and the temperature distribution of the catalyst layer can be obtained in real time, and the accurate control of the temperature distribution can be realized by adjusting and controlling the opening and closing of the baffle door.
Preferably, parallel branch flue guide plates 5 are arranged at corners of the parallel branch flues 3, the parallel branch flue guide plates 5 are parallel to the outer contours of the parallel branch flues, and the parallel branch flue guide plates are arranged in parallel.
Preferably, as shown in fig. 2, the parallel branch flue output end 13 and the input end 14 of the diversion trench 4 are connected by a special-shaped piece.
Because the sizes of the parallel branch flue output end 13 and the diversion trench input end 14 may be different, and the two side plates of the diversion trench 4 will deflect correspondingly according to the reducing diameter of the flue in the depth direction, a special-shaped piece is needed to be adopted for transition after deflection.
As shown in fig. 2 and 4, the guiding gutter 4 includes a guiding gutter input end 14, a guiding gutter output end 15 and an inclined plane end 16, the guiding gutter input end 14 is provided with a plurality of input end guiding plates 10, and the guiding gutter output end 15 is provided with a plurality of output end guiding plates 11; a plurality of parallel branch flue guide plates 5 are arranged in the parallel branch flue 3.
Preferably, as shown in fig. 1 and 2, the main flue gas injection direction is the same as the bypass flue gas injection direction in the main flue, that is, when injecting in the forward direction, the lower surface of the input end 14 of the guiding gutter is provided with an input end guiding plate 10, the input end guiding plate 10 is arranged in parallel with the inclined plane end 16, and the input end guiding plates are arranged in parallel.
The bypass flue gas is earlier through parallelly connected branch road flue 3 reentrant guiding gutter 4, mix with the main flue gas in main flue 8, the setting of guide plate can change the flue gas flow direction, the bypass flue gas passes through input guide plate 10 in the guiding gutter 8, wherein input guide plate 10 and inclined plane end 16 parallel arrangement, can reduce the bypass flue gas and inject the resistance in the guiding gutter 8, and adjust bypass flue gas injection direction, when making the bypass flue gas inject unanimous with the main flue gas direction, can mix fully evenly.
Preferably, as shown in fig. 3 and 4, the main flue gas injection direction is opposite to the bypass flue gas injection direction into the main flue, that is, when the main flue gas is injected reversely, the upper surface of the input end 14 of the guiding gutter is provided with an input end guiding plate 10, the input end guiding plate 10 is arranged in parallel with the inclined plane end 16, and the input end guiding plates are arranged in parallel;
an output end guide plate 11 is arranged on the output end 15 of the guide groove, the output end guide plate 11 is vertically arranged with the output end 15 of the guide groove, and all the output end guide plates are arranged in parallel;
the design of the output end guide plate 11 at the output end 15 of the guide groove ensures that the guide groove side plates arranged in a triangular shape can be more accurately described as a trapezoid, and the lower bottom of a group of parallel upper and lower bottoms is very short, and the design of the short side groove ensures that ash particles flow out from the two side plates along with flue gas, thereby being beneficial to reducing the deposition of ash. For the unit with a large flue inclination angle, reverse injection can be adopted to avoid the problem.
The bypass flue gas firstly enters the diversion trench 4 through the parallel branch flue 3 and then is reversely mixed with the main flue gas in the main flue 8, and the parallel branch flue 3 has a corner which can block a bypass flue gas injection path and influence the bypass flue gas injection direction, so that the parallel branch flue diversion plate 5 parallel to the outer contour of the parallel branch flue is arranged at the corner and can change the flue gas flowing direction, the bypass flue gas injection direction is consistent with the parallel branch flue direction, and the bypass flue gas uniformly enters the diversion trench 4; through input guide plate 10 and output guide plate 11 in guiding gutter 4, adjust bypass flue gas injection direction once more, wherein input guide plate 10 and inclined plane end 16 parallel arrangement can reduce the bypass flue gas and inject the resistance in the guiding gutter, and output guide plate 11 arranges with guiding gutter output 15 is perpendicular, can make bypass flue gas injection unanimous with main flue gas direction, can mix fully evenly.
Preferably, as shown in fig. 1, the drag reduction baffle 6 is arranged upstream of the diversion trench 4 without clearance from the diversion trench 4 during forward injection.
Preferably, as shown in fig. 2, when the reverse injection is performed, the resistance-reducing deflector 6 is arranged upstream of the diversion trench 4 with a gap from the diversion trench 4.
Because the main flue 8 may have an inclination angle, in order to avoid the risk of dust deposition in the diversion plate groove caused by the inclined flue, when a reverse injection mode is adopted, the bypass flue gas passes through the diversion grooves 4 arranged in a reverse triangle and is reversely mixed with the main flue gas through the gap between the resistance-reducing diversion plate 6 and the diversion grooves 4.
In embodiment 1, as shown in fig. 1 and 2, in this embodiment, a forward injection mode is adopted, the parallel branch flue 3 has a variable diameter in the depth direction, two side plates of the diversion trench 4 are correspondingly inclined, and a special-shaped piece is required to be used for transition after the inclination. The device comprises an injection port 1, wherein the upper end of the injection port 1 is provided with 5 parallel branch flues 3 with flue gas adjusting doors, the lower end of the injection port is provided with a right-angled triangular diversion trench 4, and an input end diversion plate 10 is arranged at an input end 14 of the diversion trench; the draft plate structure 2 in the main flue 8 is also included, and the draft plate structure 2 comprises a resistance-reducing draft plate 6 at the upstream of the draft groove 4 and a flaring draft plate 7 at the downstream of the draft groove 4.
Example 2, as shown in fig. 3, 4 and 5, in this example, the main flue 8 is inclined, and in order to avoid the risk of ash deposition in the baffle groove caused by the inclined flue, a reverse injection manner is adopted, and the main flue gas is reversely mixed with the main flue gas through the gap between the resistance-reducing baffle 6 and the baffle groove 4. The device comprises an injection port 1, wherein 6 parallel branch flues 3 with smoke regulating doors are arranged at the upper end of the injection port 1, parallel branch flue guide plates 5 parallel to the outer contour of the parallel branch flues are arranged in the parallel branch flues 3, the lower ends of the parallel branch flues are right-angled triangular guide grooves 4, input end guide plates 10 are arranged at input ends 14 of the guide grooves, and output end guide plates 11 are arranged at output ends 15 of the guide grooves; the draft plate structure 2 in the main flue 8 is also included, and the draft plate structure 2 comprises a resistance-reducing draft plate 6 at the upstream of the draft groove 4 and a flaring draft plate 7 at the downstream of the draft groove 4.
The working process of the invention is that when the bypass flue gas passes through the parallel branch flue 3 and the right-angled triangle diversion trench 4, the bypass flue gas is fully mixed with the main flue gas which is uniformly regulated by the diversion plate structure 2 after the depth and the width of the flue are uniformly regulated, and finally the temperature of the flue gas entering the catalytic reaction section is uniformly distributed.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110707767.8A CN113339828A (en) | 2021-06-24 | 2021-06-24 | Flue gas bypass injection structure under full load operating mode of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110707767.8A CN113339828A (en) | 2021-06-24 | 2021-06-24 | Flue gas bypass injection structure under full load operating mode of boiler |
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| CN113339828A true CN113339828A (en) | 2021-09-03 |
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| CN202110707767.8A Pending CN113339828A (en) | 2021-06-24 | 2021-06-24 | Flue gas bypass injection structure under full load operating mode of boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114797452A (en) * | 2022-04-18 | 2022-07-29 | 西安热工研究院有限公司 | Adjustable bypass injection device and adjustment method |
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| CN114797452B (en) * | 2022-04-18 | 2023-08-15 | 西安热工研究院有限公司 | Adjustable bypass injection device and adjusting method |
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