CN113048507A - Flue gas recirculation system for preventing low-temperature corrosion of four-corner tangential pulverized coal fired boiler - Google Patents
Flue gas recirculation system for preventing low-temperature corrosion of four-corner tangential pulverized coal fired boiler Download PDFInfo
- Publication number
- CN113048507A CN113048507A CN202110524464.2A CN202110524464A CN113048507A CN 113048507 A CN113048507 A CN 113048507A CN 202110524464 A CN202110524464 A CN 202110524464A CN 113048507 A CN113048507 A CN 113048507A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- recirculation
- pulverized coal
- temperature corrosion
- preventing low
- 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.)
- Pending
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000003546 flue gas Substances 0.000 title claims abstract description 72
- 230000007797 corrosion Effects 0.000 title claims abstract description 27
- 238000005260 corrosion Methods 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 240000004282 Grewia occidentalis Species 0.000 title description 3
- 239000000779 smoke Substances 0.000 claims description 35
- 238000002955 isolation Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- 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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a flue gas recirculation system for preventing low-temperature corrosion of a pulverized coal boiler with four tangential corners, which comprises a boiler flue pipe, a flue gas pipe, a recirculation fan and an adjustable shrinkage cavity; the system can slow down the low-temperature corrosion problem of the cold end of the air preheater and has better economical efficiency.
Description
Technical Field
The invention belongs to the field of pulverized coal boilers of power stations, and relates to a flue gas recirculation system for preventing low-temperature corrosion of a pulverized coal boiler with four tangential corners.
Background
When the boiler burns high-moisture and high-sulfur coal, the low-temperature part of the tail heating surface is corroded, namely low-temperature corrosion, which usually occurs at the cold end of an air preheater and in an economizer with low feed water temperature. When the temperature of the heating surface is lower than the dew point of the flue gas, sulfuric acid formed by combining water vapor in the flue gas and sulfur trioxide generated after sulfur is combusted is condensed on the heating surface to seriously corrode the heating surface, and the phenomenon of corrosion caused by condensation of steam is also called a condensation corrosion phenomenon. When sulfuric acid vapor exists in the flue gas, even if the content of the sulfuric acid vapor is very low, the influence on the dew point is also very large, and the dew point can be greatly increased. The corrosion of the low-temperature part of the heating surface at the tail part of the boiler caused by the existence of sulfuric acid steam, particularly the corrosion of the cold end of an air preheater, is always a common problem of the boiler in burning high-sulfur coal.
The main measures commonly used at present for preventing low-temperature corrosion are as follows: the air preheater inlet air temperature is increased to increase the air preheater cold end wall temperature, for example by air recirculation, by feeding preheated air from the recirculation duct to the fan inlet to mix with the cold air to increase its temperature, or by using a fan heater to heat the cold air to around 80 ℃. These methods inevitably bring about the problem of the rise of the exhaust gas temperature, which affects the overall economy of the unit, and even with these methods, low-temperature corrosion still occurs at the cold end of the air preheater when the sulfur content of the coal is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a flue gas recirculation system for preventing low-temperature corrosion of a pulverized coal boiler with four tangential corners, which can slow down the problem of low-temperature corrosion of the cold end of an air preheater and has better economical efficiency.
In order to achieve the aim, the flue gas recirculation system for preventing low-temperature corrosion of the pulverized coal boiler with the four tangential corners comprises a boiler flue pipe, a flue gas pipe, a recirculation fan and an adjustable shrinkage cavity;
the inlet flue of the air preheater is provided with a furnace smoke extraction port, one end of the furnace smoke pipeline is communicated with the furnace smoke extraction port, the other end of the furnace smoke pipeline is communicated with the inlet of the recirculation fan, and the outlet of the recirculation fan is communicated with each recirculation smoke nozzle on the hearth through the smoke pipeline.
An electric regulating valve is arranged on the flue gas pipeline.
An electric isolation door is arranged on the flue gas pipeline.
The flue gas pipeline is provided with a flow wind measuring device.
Adjustable shrinkage cavities are arranged between the flue gas pipeline and each recirculation flue gas nozzle.
All the recirculating smoke nozzles are distributed in turn along the circumferential direction.
The number of the recirculation flue gas nozzles is four, and the four recirculation flue gas nozzles are respectively arranged at the positions of four edges and corners of the hearth.
The distance between the recirculated flue gas nozzle and the lowest layer secondary air nozzle on the hearth is 0.2 m.
The direction of the smoke of each circulating smoke nozzle is tangent to the same circle and is the same as the rotation direction of the tangent circle of the main airflow in the furnace.
The invention has the following beneficial effects:
when the flue gas recirculation system for preventing low-temperature corrosion of the pulverized coal fired boiler with the four tangential points is in specific operation, the recirculation fan extracts flue gas in the inlet pipeline of the air preheater and sends the flue gas into the recirculation flue gas nozzle, the central temperature of flame is reduced through the recirculation flue gas, the concentration of atomic oxygen is reduced, and meanwhile, the content of inert gas is increased to reduce SO3The generation amount is reduced, the low-temperature corrosion problem of the cold end of the air preheater is relieved, and the economical efficiency is good.
Furthermore, the flow of the recycled flue gas is regulated and controlled by regulating the working states of the electric regulating valve and the recycling fan.
Further, when the recirculation fan stops working, the electric isolation door is closed, and the flue gas is effectively prevented from flowing backwards into the flue pipe of the furnace.
Further, the flow of the flue gas entering the recirculation flue gas nozzle is leveled by adjusting the adjustable shrinkage cavity, and the flue gas entering the furnace is ensured to form a good tangent circle.
Furthermore, the direction of the flue gas sprayed into each circulating flue gas nozzle is tangent to the same circle, and the rotating direction of the circulating flue gas nozzles is the same as the rotating direction of the tangent circle of the main airflow in the furnace, so that an airflow field in the furnace is not disturbed, and the flue gas can be uniformly mixed.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is a schematic view of the recirculation flue gas nozzle 7 and flue gas duct of the present invention.
Wherein, 1 is an air preheater, 2 is a recirculation fan, 3 is an electric regulating valve, 4 is an electric isolation door, 5 is a flow wind measuring device, 6 is an adjustable shrinkage cavity, and 7 is a recirculation flue gas nozzle.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the flue gas recirculation system for preventing low temperature corrosion of a four-corner tangential pulverized coal fired boiler of the invention comprises a furnace smoke extraction port, a furnace smoke pipeline, a recirculation fan 2, an electric regulating valve 3, an electric isolation door 4, a flow wind measuring device 5, an adjustable shrinkage cavity 6 and a recirculation flue gas nozzle 7;
the furnace smoke extraction port is positioned on an inlet flue of the air preheater 1, one end of a furnace smoke pipeline is communicated with the furnace smoke extraction port, the other end of the furnace smoke pipeline is communicated with an inlet of the recirculation fan 2, an outlet of the recirculation fan 2 is communicated with each recirculation smoke nozzle 7 on the hearth through a smoke pipeline, an electric adjusting valve 3, an electric isolation door 4 and a flow wind measuring device 5 are sequentially arranged on the smoke pipeline along the smoke flowing direction, an adjustable shrinkage cavity 6 is arranged between the smoke pipeline and each recirculation smoke nozzle 7, and each recirculation smoke nozzle 7 is sequentially distributed along the circumferential direction.
Specifically, each recirculation flue gas spout 7 distributes along circumference in proper order, and the figure of recirculation flue gas spout 7 is four, and four recirculation flue gas spouts 7 are installed respectively in the position department of four edges and corners of furnace.
The distance between the recirculation flue gas nozzle 7 and the secondary air nozzle at the lowest layer on the hearth is 0.2m, the direction of the flue gas sprayed by each recirculation flue gas nozzle is tangent to the same circle, and the rotating direction is the same as the rotating direction of the tangent circle of the main airflow in the furnace.
The specific working process of the invention is as follows:
the boiler smoke outlet is positioned on an inlet flue of the air preheater 1, smoke in a tail flue of the boiler is extracted from the boiler smoke outlet through the recirculation fan 2, then the smoke is sent into the recirculation smoke nozzle 7 through the electric regulating valve 3 and the electric isolation door 4 in sequence, and then the smoke is sprayed into a hearth through the recirculation smoke nozzle 7.
The flue gas flow of the flue gas pipeline is measured through the flow air measuring device 5, the flue gas flow entering each recirculation flue gas nozzle 7 is leveled through the adjustable shrinkage holes 6, in practical application, the recirculation fan 2 and the electric adjusting valve 3 are adjusted according to the sulfur content of fire coal, the recirculation flue gas amount is changed, the recirculation flue gas amount is 0-30% of the total air amount entering the furnace, when the recirculation fan 2 works, the electric isolation door 4 is in a fully-open state, when the recirculation fan 2 stops working, and when the recirculation flue gas amount is 0%, the electric isolation door 4 is in a closed state.
Claims (9)
1. A flue gas recirculation system for preventing low-temperature corrosion of a pulverized coal boiler with four tangential corners is characterized by comprising a furnace flue pipe, a flue gas pipe, a recirculation fan (2) and an adjustable shrinkage cavity (6);
the inlet flue of the air preheater (1) is provided with a furnace smoke extraction port, one end of a furnace smoke pipeline is communicated with the furnace smoke extraction port, the other end of the furnace smoke pipeline is communicated with the inlet of the recirculation fan (2), and the outlet of the recirculation fan (2) is communicated with each recirculation smoke nozzle (7) on the hearth through the smoke pipeline.
2. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangential pulverized coal fired boiler as defined in claim 1, wherein the flue gas pipeline is provided with an electric regulating valve (3).
3. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangential pulverized coal fired boiler as defined in claim 1, wherein the flue gas pipeline is provided with an electric isolation door (4).
4. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangential pulverized coal fired boiler as defined in claim 1, wherein the flue gas pipeline is provided with a flow rate wind measuring device (5).
5. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangent pulverized coal fired boiler as claimed in claim 1, characterized in that an adjustable shrinkage cavity (6) is arranged between the flue gas pipeline and each recirculation flue gas nozzle (7).
6. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangential pulverized coal fired boiler as recited in claim 1, characterized in that the recirculation flue gas nozzles (7) are distributed in sequence along the circumferential direction.
7. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangent pulverized coal fired boiler as defined in claim 1, wherein the number of the recirculation flue gas nozzles (7) is four, and the four recirculation flue gas nozzles (7) are respectively installed at four corners of the furnace.
8. The flue gas recirculation system for preventing low-temperature corrosion of a corner-tangential pulverized coal fired boiler as defined in claim 1, characterized in that the distance between the recirculated flue gas nozzle (7) and the secondary air nozzle at the lowest layer of the furnace is 0.2 m.
9. The flue gas recirculation system for preventing low-temperature corrosion of a pulverized coal fired boiler with tangential corners as claimed in claim 1, wherein the direction of flue gas injected from each circulating flue gas nozzle is tangential to the same circle and is the same as the tangential rotation direction of the main gas flow in the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110524464.2A CN113048507A (en) | 2021-05-13 | 2021-05-13 | Flue gas recirculation system for preventing low-temperature corrosion of four-corner tangential pulverized coal fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110524464.2A CN113048507A (en) | 2021-05-13 | 2021-05-13 | Flue gas recirculation system for preventing low-temperature corrosion of four-corner tangential pulverized coal fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113048507A true CN113048507A (en) | 2021-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110524464.2A Pending CN113048507A (en) | 2021-05-13 | 2021-05-13 | Flue gas recirculation system for preventing low-temperature corrosion of four-corner tangential pulverized coal fired boiler |
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|---|---|
| CN (1) | CN113048507A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205991485U (en) * | 2016-08-27 | 2017-03-01 | 哈尔滨锅炉厂有限责任公司 | The double reheat boiler smoke recirculating system of flue gas spout upper and lower two-layer arrangement |
| US20180010792A1 (en) * | 2016-07-08 | 2018-01-11 | Arvos, Inc. | Method and system for improving boiler effectiveness |
| CN109578994A (en) * | 2018-12-13 | 2019-04-05 | 西安交通大学 | A kind of flue gas recirculation and microfine coal classification gasification low NOx combustion system |
| CN111237740A (en) * | 2020-03-16 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Anti-corrosion flue gas recirculation system and method |
| CN111750373A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Flue gas recirculation system for preventing accumulated powder of coal powder pipeline of medium-speed coal mill from spontaneous combustion |
-
2021
- 2021-05-13 CN CN202110524464.2A patent/CN113048507A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180010792A1 (en) * | 2016-07-08 | 2018-01-11 | Arvos, Inc. | Method and system for improving boiler effectiveness |
| CN205991485U (en) * | 2016-08-27 | 2017-03-01 | 哈尔滨锅炉厂有限责任公司 | The double reheat boiler smoke recirculating system of flue gas spout upper and lower two-layer arrangement |
| CN109578994A (en) * | 2018-12-13 | 2019-04-05 | 西安交通大学 | A kind of flue gas recirculation and microfine coal classification gasification low NOx combustion system |
| CN111237740A (en) * | 2020-03-16 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Anti-corrosion flue gas recirculation system and method |
| CN111750373A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Flue gas recirculation system for preventing accumulated powder of coal powder pipeline of medium-speed coal mill from spontaneous combustion |
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Application publication date: 20210629 |