CN111804168A - Automatic adjustment type flue gas mixing device for adjusting temperature deviation of flue - Google Patents
Automatic adjustment type flue gas mixing device for adjusting temperature deviation of flue Download PDFInfo
- Publication number
- CN111804168A CN111804168A CN202010646585.XA CN202010646585A CN111804168A CN 111804168 A CN111804168 A CN 111804168A CN 202010646585 A CN202010646585 A CN 202010646585A CN 111804168 A CN111804168 A CN 111804168A
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- China
- Prior art keywords
- shutter
- flue
- flue gas
- pair
- temperature deviation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000003546 flue gas Substances 0.000 title claims abstract description 41
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 description 13
- 239000010410 layer Substances 0.000 description 10
- 238000000926 separation method Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram 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
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
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- 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 on two sides of the flue; the triangular blocking pieces are vertically arranged in the pair of brackets; the louver baffles are arranged on two sides between the adjacent triangular baffles in a staggered manner; the pair of shutter adjusting mechanisms are rotatably hinged on the pair of brackets, and the shutter baffle is arranged on the shutter adjusting mechanisms; the thermocouple type temperature sensors are arranged on the outer sides of the triangular blocking pieces, and the thermocouple type temperature sensors and the shutter adjusting mechanism are externally connected with controllers.
Description
Technical Field
The invention belongs to the technical field of thermal power generation equipment, and particularly relates to an automatic adjustment type flue gas mixing device for adjusting flue temperature deviation.
Background
In order to reduce capital construction investment, a single air preheater arrangement design is adopted in part of newly-built thermal power plants during design, at the moment, the air preheater adopts a larger rotor diameter during model selection due to the increase of flue gas flow, the flue gas temperature on the left side and the right side of a flue gas side outlet of the air preheater has larger deviation due to the large rotor diameter (the actual power plant operation shows that the flue gas temperature deviation on the two sides can reach 40-50 ℃), so that the flue gas temperature at the inlet of a bag-type dust collector connected with the flue gas on the high-temperature side is too high, and the accident of burning out a bag of the dust collector occurs.
In order to respond to a deep peak regulation policy, a boiler economizer bypass flue is modified to meet the requirement that the smoke temperature at an SCR inlet reaches the normal reaction temperature of a catalyst under low load, but due to the size difference of the cross sections of the bypass flue and a main flue, the phenomenon of uneven distribution of the smoke temperature about the mixed smoke is caused, so that the nitrogen oxide in an SCR low-temperature smoke reaction zone can not be removed by reaction, and the environment-friendly index can not be reached.
Traditional baffle water conservancy diversion formula flue gas mixing arrangement is many not adjustable to the mixed degree of flue gas, has the phenomenon of excessive mixing when having under the less operating mode of flue left and right sides gas temperature deviation, must increase mixing arrangement's flow resistance, increases the fan power consumption.
The adjustable baffle type flue gas mixing device has larger inertia to the regulation characteristic of the flue gas temperature deviation (namely the flue gas temperature deviation can be changed after a longer period of time after the baffle opening degree is changed), the traditional PID control mode based on the deviation can be adopted, the flue gas temperature deviation cannot be stabilized at a set value due to the fact that the baffle opening degree is excessively regulated to a certain degree, and automatic control of the device cannot be well realized.
Disclosure of Invention
The invention aims to provide an automatic adjusting type flue gas mixing device for adjusting flue temperature deviation, and solves the problem that the flow of flue gas on the left side and the right side of an existing flue is difficult to control.
In order to achieve the purpose, the invention adopts the technical scheme that: an automatically adjusting formula flue gas mixing arrangement for adjusting flue temperature deviation, includes:
a pair of brackets; the pair of brackets are symmetrically arranged on two sides of the flue;
the triangular blocking pieces are vertically arranged in the pair of brackets;
the louver baffles are arranged on two sides between the adjacent triangular baffles in a staggered manner;
the pair of shutter adjusting mechanisms are rotatably hinged on the pair of brackets, and the shutter baffle is arranged on the shutter adjusting mechanisms;
the thermocouple type temperature sensors are arranged on the outer sides of the triangular blocking pieces, and the thermocouple type temperature sensors and the shutter adjusting mechanism are externally connected with controllers.
The technical scheme of the invention also has the following characteristics:
the triangular separation blade is an isosceles triangle separation blade.
The shutter baffles are positioned on two equal sides of the triangular baffle.
The shutter adjusting mechanism comprises a long rod, a plurality of short rods are arranged on the long rod and hinged to the support, and a central shaft of the shutter baffle is connected with the short rods.
The front ends of the triangular separation blades are provided with partition plates.
Compared with the prior art, the automatic adjusting type flue gas mixing device for adjusting the temperature deviation of the flue has the following advantages: (1) the flue is divided into a plurality of layers of circulation areas by adopting a plurality of isosceles triangle separation blades, so that the uniform mixing of the flue gas on the left side and the flue gas on the right side can be ensured, the size of a mixing device can be reduced, the mixing distance of the flue gas is reduced, and the consumption of steel is reduced; (2) the flue is divided into a plurality of layers, and shutter baffles are arranged on different layers in a staggered manner, so that the flue gas on the left side and the flue gas on the right side are uniformly mixed; (3) the louver baffles arranged in each layer in a staggered mode can rotate, the proportion of flue gas entering the left side and the right side in the single-layer channel can be changed, the mixing degree of the mixing device can be adjusted, the mixing strength of the mixing device can be dynamically adjusted according to different flue gas temperature deviation working conditions, the flow resistance brought by the grating plates is reduced to the maximum degree while the flue gas temperature deviation is eliminated, and the energy-saving effect of the fan is achieved; (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 the traditional PID type regulation mixing device based on the traditional deviation PID property, and a power plant operator sets a smoke temperature deviation set value at a DCS; (5) the mixing device of the invention has modular characteristics, and can be combined for use: if two mixing devices designed by the invention are sequentially combined in series (the angle of the grating framework is different by 90 degrees), 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 simultaneously.
Drawings
FIG. 1 is an installation schematic diagram of an automatic regulating flue gas mixing device for regulating flue temperature deviation according to the present invention;
FIG. 2 is a schematic structural diagram of an automatic regulating flue gas mixing device for regulating 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, a flue, 2, a bracket, 3, a short rod, 4, a long rod, 5, a blind pull rod, 6, a partition board and 7, a triangular baffle plate.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the automatic adjusting type flue gas mixing device for adjusting flue temperature deviation of the present invention comprises:
a pair of brackets 2; the pair of brackets 2 are symmetrically arranged at two sides of the flue 1;
the triangular blocking pieces 7 are vertically arranged in the pair of supports 2, and the front ends of the triangular blocking pieces 7 are provided with partition plates 6;
the shutter baffles 5 are arranged on two sides between the adjacent triangular baffles 7 in a staggered manner; the triangular baffle 7 is preferably an isosceles triangle baffle, and the plurality of shutter baffles 5 are positioned at two equal sides of the triangular baffle 7;
a pair of shutter adjusting mechanisms rotatably hinged to the pair of brackets 2, and shutter plates 5 provided on the shutter adjusting mechanisms; the shutter adjusting mechanism comprises a long rod 4, a plurality of short rods 3 are arranged on the long rod 4, the short rods 3 are hinged on the support 2, and a central shaft of a shutter baffle 5 is connected with the short rods 3;
the thermocouple type temperature sensors are arranged on the outer sides of the triangular blocking pieces 7, and controllers are connected with the thermocouple type temperature sensors and the shutter adjusting mechanism in an external mode.
As shown in fig. 2, the automatic adjustment type flue gas mixing device for adjusting flue temperature deviation of the present invention comprises a triangular grid framework (a grid passage structure formed by a plurality of triangular baffles 7 in the figure), an adjustable blind baffle, a blind adjusting mechanism, an end partition (a partition extending from 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, adjustable shutter plates are used for distributing the proportion of 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, shutter adjusting mechanisms are used for synchronously adjusting the shutter plates at the two sides, and partition plates at the end parts are used for prolonging the mixing section to ensure the full mixing.
As shown in fig. 3, louver baffles 5 are arranged in different grid layers in a staggered manner, and the ratio of the smoke flowing out from the left side and the right side of each layer can be adjusted by adjusting the opening degree of the louver baffles 5, for example, when the louver baffles 5 are fully closed, the smoke in the section of the 1 st layer in the figure flows out from the left side of the figure, and each layer is alternated once, so that the mixing effect of the device is best, the mixing of the smoke at the left side and the smoke at the right side can be realized to the maximum extent, but the flow resistance is also the maximum at this time, when the louver baffles are fully opened, the ratio of the smoke flowing out from the left side and the right side of each layer is 1:1, which means that no mixing is performed at this time, the flow resistance is also the minimum, and therefore, the device can realize mixing.
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 to realize the opening adjustment of the shutters, all the short rods are connected with the long rods on the side part, and the synchronous adjustment of the openings of all the shutter baffles 5 on the 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 the pneumatic control executing mechanism, and the synchronous opening and closing of the left shutter baffle and the right shutter baffle can be realized through the control of the 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 the traditional PID type regulation mixing device based on the traditional deviation PID property, and a power plant operator sets a smoke temperature deviation set value at a DCS.
Therefore, the automatic adjustment type flue gas mixing device for adjusting the flue temperature deviation can achieve uniform temperature at each position in the cross section of the flue in a short flue gas circulation distance, and can adjust the baffle angle of the mixing device according to the flue temperature deviation on the left side and the right side in the flue, so that the resistance is reduced to the maximum degree while the flue temperature deviation is smaller than a given value.
Claims (5)
1. The utility model provides an automatically regulated formula flue gas mixing arrangement for adjusting flue temperature deviation which 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 blocking pieces (7) are vertically arranged in the pair of brackets (2);
the louver baffles (5) are arranged on two sides between the adjacent triangular baffles (7) in a staggered manner;
the pair of shutter adjusting mechanisms are rotatably hinged on the pair of brackets (2), and the shutter baffle (5) is arranged on the shutter adjusting mechanisms;
the thermocouple type temperature sensors are arranged on the outer sides of the triangular blocking pieces (7), and controllers are externally connected with the thermocouple type temperature sensors and the shutter adjusting mechanism.
2. The automatic regulating flue gas mixing device for regulating flue temperature deviation according to claim 1, characterized in that the triangular baffle (7) is an isosceles triangle baffle.
3. The automatic regulating flue gas mixing device for regulating flue temperature deviation according to claim 1, characterized in that a plurality of said shutter baffles (5) are located on both sides of a triangular baffle (7).
4. The automatic regulating flue gas mixing device for regulating flue temperature deviation according to claim 3, characterized in that the shutter regulating 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 the central shaft of the shutter (5) is connected with the short rods (3).
5. The automatic regulating flue gas mixing device for regulating flue temperature deviation according to claim 4, characterized in that the front ends of the triangular baffles (7) are provided with a partition plate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646585.XA CN111804168B (en) | 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 | Automatic adjusting type flue gas mixing device for adjusting flue temperature deviation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111804168A true CN111804168A (en) | 2020-10-23 |
| CN111804168B CN111804168B (en) | 2024-10-22 |
Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717678A (en) * | 2020-12-24 | 2021-04-30 | 大连航化能源装备有限公司 | Industrial furnace dry desulphurization device and desulphurization method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000233121A (en) * | 1999-02-12 | 2000-08-29 | Mitsubishi Heavy Ind Ltd | Gas mixing apparatus |
| US20130291983A1 (en) * | 2012-05-05 | 2013-11-07 | Mitchell B. Cohen | Enhanced flue gas damper mixing device |
| JP2017058034A (en) * | 2015-09-14 | 2017-03-23 | 三菱日立パワーシステムズ株式会社 | Boiler |
| CN106731827A (en) * | 2017-01-20 | 2017-05-31 | 苏州西热节能环保技术有限公司 | A kind of AIG upstreams flue gas is on a large scale from mixing arrangement |
| 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 |
| 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 |
| 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 |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000233121A (en) * | 1999-02-12 | 2000-08-29 | Mitsubishi Heavy Ind Ltd | Gas mixing apparatus |
| US20130291983A1 (en) * | 2012-05-05 | 2013-11-07 | Mitchell B. Cohen | Enhanced flue gas damper mixing device |
| JP2017058034A (en) * | 2015-09-14 | 2017-03-23 | 三菱日立パワーシステムズ株式会社 | Boiler |
| CN106731827A (en) * | 2017-01-20 | 2017-05-31 | 苏州西热节能环保技术有限公司 | A kind of AIG upstreams flue gas is on a large scale from mixing arrangement |
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717678A (en) * | 2020-12-24 | 2021-04-30 | 大连航化能源装备有限公司 | Industrial furnace dry desulphurization device and desulphurization method |
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