CN111804168B - Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation - Google Patents
Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation Download PDFInfo
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- CN111804168B CN111804168B CN202010646585.XA CN202010646585A CN111804168B CN 111804168 B CN111804168 B CN 111804168B CN 202010646585 A CN202010646585 A CN 202010646585A CN 111804168 B CN111804168 B CN 111804168B
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- flue gas
- shutter
- adjusting
- flue
- pair
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 7
- 239000002356 single layer Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000013528 artificial neural network Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010801 machine learning Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
- B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/1928—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperature of one space
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses an automatic adjusting type flue gas mixing device for adjusting flue temperature deviation, which comprises a pair of brackets; the pair of brackets are symmetrically arranged at two sides of the flue; the triangular baffle plates are arranged in the pair of brackets up and down; the louver baffles are arranged on two sides between the adjacent triangular baffle plates in a staggered mode; a pair of shutter adjusting mechanisms rotatably hinged to the pair of brackets, the shutter plates being provided on the shutter adjusting mechanisms; the temperature sensor is arranged on the outer side of the triangular baffle plate, and the temperature sensor and the shutter adjusting mechanism are externally connected with a controller.
Description
Technical Field
The invention belongs to the technical field of thermal power generation equipment, and particularly relates to an automatic adjusting type flue gas mixing device for adjusting flue temperature deviation.
Background
In order to reduce capital investment, a part of newly-built thermal power plants are designed by adopting a single air preheater arrangement design, at the moment, the air preheater adopts a larger rotor diameter during the shape selection due to the increase of the flue gas flow, and the large rotor diameter can cause larger deviation of the flue gas temperature at the left side and the right side of the flue gas side outlet of the air preheater (the actual power plant operation shows that the flue gas temperature deviation at the two sides can be up to 40-50 ℃), so that the flue gas temperature at the inlet of a bag-type dust collector connected with high-temperature side flue gas is too high, and the bag of the dust collector is burnt out.
For response depth peak regulation policy in thermal power plant, the boiler economizer bypass flue is reformed so as to meet that the SCR inlet flue temperature reaches the normal temperature of catalyst reaction under low load, but because of the size difference between the bypass flue and the main flue section, the phenomenon of uneven left and right flue temperature distribution is caused after the flue gas is mixed, and nitrogen oxides in the SCR low-temperature flue gas reaction zone cannot be removed by reaction, and the environmental protection index cannot be reached.
The traditional baffle diversion type flue gas mixing device is not adjustable in mixing degree of flue gas, and when the phenomenon of excessive mixing exists under the working condition that the flue temperature deviation is small at the left side and the right side of a flue, the flow resistance of the mixing device is increased, and the power consumption of a fan is increased.
The adjustable baffle type flue gas mixing device has larger inertia to the regulation characteristic of flue gas temperature deviation (namely, the flue gas temperature deviation can change after a longer period of time when the opening degree of the baffle is changed), and the traditional PID control mode based on deviation can appear that the excessive regulation of the opening degree of the baffle leads to the failure of stabilizing the flue gas temperature deviation at a set value to a certain extent, so that the automatic control of the device can not be realized well.
Disclosure of Invention
The invention aims to provide an automatic adjusting type flue gas mixing device for adjusting flue temperature deviation, which solves the problem that the flue gas flow on the left side and the right side of the existing flue is difficult to control.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an automatically adjusting type flue gas mixing device for adjusting flue temperature deviation, comprising:
a pair of brackets; the pair of brackets are symmetrically arranged at two sides of the flue;
the triangular baffle plates are arranged in the pair of brackets up and down;
the louver baffles are arranged on two sides between the adjacent triangular baffle plates in a staggered mode;
A pair of shutter adjusting mechanisms rotatably hinged to the pair of brackets, the shutter plates being provided on the shutter adjusting mechanisms;
The temperature sensor is arranged on the outer side of the triangular baffle plate, and the temperature sensor and the shutter adjusting mechanism are externally connected with a controller.
The technical scheme of the invention also has the following characteristics:
the triangular baffle is an isosceles triangle baffle.
The shutter baffles are positioned on two equilateral sides of the triangular baffle plate.
The shutter adjusting mechanism comprises a long rod, a plurality of short rods are arranged on the long rod, the short rods are hinged to the support, and a central shaft of the shutter baffle is connected with the short rods.
The front ends of the triangular baffle plates are provided with baffle plates.
Compared with the prior art, the automatic adjusting type flue gas mixing device for adjusting the flue temperature deviation has the following advantages: (1) The flue is divided into a plurality of layers of circulating areas by adopting the isosceles triangle baffle plates, so that the uniformity of mixing of the left and right side flue gas can be ensured, the size of a mixing device can be reduced, the mixing distance of the flue gas is reduced, and meanwhile, the steel consumption is saved; (2) The flue is divided into a plurality of layers, and shutter baffles are arranged on different layers in a staggered manner, so that uniform mixing of left and right flue gas is realized; (3) The blind baffles arranged in a staggered manner in each layer are rotatable, so that the proportion of flue gas entering the left side and the right side in a single-layer channel can be changed, the mixing degree of the mixing device can be adjusted, the mixing intensity of the mixing device can be dynamically adjusted according to different flue temperature deviation working conditions, the flowing resistance brought by the grating plates is reduced to the greatest extent while the flue temperature deviation is eliminated, and the effect of saving energy of a fan is realized; (4) automatic control logic based on machine learning modeling: the flue baffle has larger inertia to the regulation characteristic of the smoke temperature deviation, a plurality of thermocouple type temperature sensors are arranged at the inlet and the outlet of a traditional PID type regulation mixing device based on the deviation, a power plant operator sets a smoke temperature deviation set value at a DCS, and the invention adopts a neural network modeling device to realize the automatic regulation of the opening of the baffle according to control logic, and when the smoke temperature deviation is ensured to reach the set value, the opening of the baffle is regulated to be as large as possible, the resistance is reduced, and the energy saving is realized; (5) The mixing device of the invention has a modularized characteristic and can be used in combination: if the two designed mixing devices (the angles of the grid frameworks differ by 90 degrees) are sequentially combined in series, the adjustment of the temperature difference and the resistance of the flue gas in the horizontal direction and the vertical direction in the flue can be realized.
Drawings
FIG. 1 is a schematic illustration of the installation of an automatically adjusting flue gas mixing device for adjusting flue temperature deviation of the present invention;
FIG. 2 is a schematic diagram of an automatically adjusting flue gas mixing device for adjusting flue temperature deviation according to the present invention;
Fig. 3 is a schematic view of the shutter arrangement of fig. 1.
In the figure, 1 part of flue, 2 parts of bracket, 3 parts of short rod, 4 parts of long rod, 5 parts of shutter pull rod, 6 parts of partition board and 7 parts of triangular baffle.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and specific embodiments.
As shown in fig. 1, an automatically adjusting type flue gas mixing device for adjusting flue temperature deviation according to the present invention includes:
a pair of brackets 2; the pair of brackets 2 are symmetrically arranged at two sides of the flue 1;
the triangular baffle plates 7 are arranged in the pair of brackets 2 up and down, and the front ends of the triangular baffle plates 7 are provided with the baffle plates 6;
a plurality of shutter plates 5, the shutter plates 5 are staggered on two sides between the adjacent triangular baffle plates 7; the triangular baffle plates 7 are preferably isosceles triangular baffle plates, and the plurality of shutter baffles 5 are positioned on two equilateral sides of the triangular baffle plates 7;
A pair of shutter adjusting mechanisms rotatably hinged to the pair of brackets 2, on which shutter plates 5 are provided; the shutter adjusting mechanism comprises a long rod 4, a plurality of short rods 3 are arranged on the long rod 4, the plurality of short rods 3 are hinged on the bracket 2, and a central shaft of the shutter baffle 5 is connected with the short rods 3;
The plurality of thermocouple type temperature sensors are arranged on the outer sides of the triangular baffle plates 7, and the thermocouple type temperature sensors and the shutter adjusting mechanism are externally connected with a controller.
As shown in fig. 2, the automatic adjusting type flue gas mixing device for adjusting flue temperature deviation of the invention is composed of a triangular grid framework (a grid channel structure formed by a plurality of triangular baffle plates 7 in the figure), an adjustable shutter baffle plate, a shutter adjusting mechanism, an end baffle plate (a baffle plate extending out of the end of the triangular grid framework), a thermocouple type temperature sensor and the like.
As shown in fig. 2, the triangular grid framework divides the flue into a plurality of flow passage areas, the adjustable shutter plates are used for distributing the proportion of the flue gas entering the left side and the right side in each grid layer to realize the adjustability of the mixing degree and the flow resistance, the shutter adjusting mechanism is used for synchronously adjusting the shutter plates at two sides, and the partition plates at the end parts are used for prolonging the mixing section to ensure the mixing to be sufficient.
As shown in FIG. 3, the shutter plates 5 are arranged in a staggered manner in different grating layers, the proportion of the flue gas flowing out from the left side and the right side in each layer can be adjusted by adjusting the opening degree of the shutter plates 5, for example, when the shutter plates 5 are fully closed, the flue gas with the 1 st layer section in the figure flows out from the left side in the figure, each layer is alternated once, the mixing effect of the device is best at the moment, the mixing of the flue gas at the left side and the right side can be maximally realized, but the flow resistance is also maximized at the moment, when the flue gas baffles are fully opened, the proportion of the flue gas flowing out from the left side and the right side in each layer is 1:1, and the flow resistance is also minimum at the moment, so that the device can realize the mixing and the adjustment of the resistance according to different working conditions such as the flue gas amount, the flue gas temperature difference and the like.
The central shafts of all the shutter baffles 5 on the same side are rigidly connected with the short rods of the shutter adjusting mechanism, the corresponding shutter baffles can be rotated by rotating the short connecting rods, the shutter opening degree adjustment is realized, all the short rods are connected with the long rods on the side, and the synchronous adjustment of the opening degree of all the shutter baffles 5 on the same side can be realized by pulling the long rods up and down; meanwhile, the left long rod and the right long rod are rigidly connected and then connected to a pneumatic control executing mechanism, and synchronous opening and closing of the left shutter baffle and the right shutter baffle can be realized through control of a controller.
Automatic control logic based on machine learning modeling: the flue baffle has larger inertia to the regulation characteristic of the smoke temperature deviation, a plurality of thermocouple type temperature sensors are arranged at the inlet and the outlet of a traditional PID type regulation mixing device based on the deviation, a power plant operator sets a smoke temperature deviation set value at a DCS, and the invention adopts a neural network modeling device to realize the automatic regulation of the opening of the baffle according to control logic, and when the smoke temperature deviation is ensured to reach the set value, the opening of the baffle is regulated to be as large as possible, the resistance is reduced, and the energy saving is realized.
Therefore, the automatic adjusting type flue gas mixing device for adjusting the flue temperature deviation can realize uniform temperature in the section of the flue in a shorter flue gas circulation distance, and can adjust the baffle angle of the mixing device according to the flue temperature deviation of the left side and the right side in the flue, so that the flue temperature deviation is smaller than a given value and resistance is reduced to the greatest extent.
Claims (5)
1. An automatically regulated formula flue gas mixing arrangement for adjusting flue temperature deviation, characterized in that includes:
a pair of brackets (2); the pair of brackets (2) are symmetrically arranged at two sides of the flue (1);
The triangular baffle plates (7) are arranged in the pair of brackets (2) up and down; the triangular baffle plates (7) form a grid channel structure; dividing the flue into a plurality of layers of runner areas;
The louver baffles (5) are arranged on two sides between the adjacent triangular baffle plates (7) in a staggered mode; the blind baffles arranged in a staggered manner in each layer can rotate, so that the proportion of flue gas entering the left side and the right side in the single-layer channel can be changed;
A pair of shutter adjusting mechanisms rotatably hinged to the pair of brackets (2), the shutter plates (5) being provided on the shutter adjusting mechanisms; the shutter adjusting mechanism is used for synchronously adjusting the opening degrees of the shutter baffles at two sides;
The thermocouple type temperature sensors are arranged on the outer sides of the triangular baffle plates (7), and the thermocouple type temperature sensors and the shutter adjusting mechanism are externally connected with a controller; and adjusting the baffle angle of the mixing device according to the deviation of the smoke temperature at the left side and the right side in the flue.
2. The automatic regulating type flue gas mixing device for regulating flue gas temperature deviation according to claim 1, wherein the triangular baffle (7) is an isosceles triangle baffle.
3. The automatically regulated flue gas mixing device for regulating flue gas temperature deviation according to claim 1, wherein a plurality of said shutter plates (5) are located on both equilateral sides of a triangular flap (7).
4. An automatically regulated formula flue gas mixing arrangement for adjusting flue gas temperature deviation according to claim 3, wherein the shutter adjustment mechanism comprises a long rod (4), a plurality of short rods (3) are arranged on the long rod (4), the plurality of short rods (3) are hinged on the support (2), and the central axis of the shutter baffle (5) is connected with the short rods (3).
5. The automatic adjustment type flue gas mixing device for adjusting flue gas temperature deviation according to claim 4, wherein the front ends of the plurality of triangular baffle plates (7) are provided with baffle plates (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646585.XA CN111804168B (en) | 2020-07-07 | 2020-07-07 | Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646585.XA CN111804168B (en) | 2020-07-07 | 2020-07-07 | Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation |
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| Publication Number | Publication Date |
|---|---|
| CN111804168A CN111804168A (en) | 2020-10-23 |
| CN111804168B true CN111804168B (en) | 2024-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010646585.XA Active CN111804168B (en) | 2020-07-07 | 2020-07-07 | Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation |
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| CN (1) | CN111804168B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112717683B (en) * | 2020-11-10 | 2025-04-22 | 苏州西热节能环保技术有限公司 | A triangular multi-channel SCR static mixer |
| CN112717678B (en) * | 2020-12-24 | 2025-01-28 | 大连航化能源装备有限公司 | Industrial furnace dry desulfurization device and desulfurization method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212549076U (en) * | 2020-07-07 | 2021-02-19 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Flue gas mixing device for adjusting flue temperature deviation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3727799B2 (en) * | 1999-02-12 | 2005-12-14 | 三菱重工業株式会社 | Gas mixer |
| US9488369B2 (en) * | 2012-05-05 | 2016-11-08 | General Electric Technology Gmbh | Enhanced flue gas damper mixing device |
| JP6535555B2 (en) * | 2015-09-14 | 2019-06-26 | 三菱日立パワーシステムズ株式会社 | boiler |
| CN106731827B (en) * | 2017-01-20 | 2022-08-26 | 苏州西热节能环保技术有限公司 | AIG upstream flue gas is from mixing arrangement on a large scale |
| CN110220561A (en) * | 2018-03-02 | 2019-09-10 | 国电南京电力试验研究有限公司 | A kind of boiler separating flue gas tolerance ratio based on smoke temperature difference is surveyed online, calculates system |
| CN208542042U (en) * | 2018-07-06 | 2019-02-26 | 大唐环境产业集团股份有限公司 | A kind of intersection flow-guiding type flue gas mixer for SCR denitrating flue gas |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212549076U (en) * | 2020-07-07 | 2021-02-19 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Flue gas mixing device for adjusting flue temperature deviation |
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| CN111804168A (en) | 2020-10-23 |
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