CN211952820U - Air preheating circulating ash removal system - Google Patents
Air preheating circulating ash removal system Download PDFInfo
- Publication number
- CN211952820U CN211952820U CN202020562270.2U CN202020562270U CN211952820U CN 211952820 U CN211952820 U CN 211952820U CN 202020562270 U CN202020562270 U CN 202020562270U CN 211952820 U CN211952820 U CN 211952820U
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- CN
- China
- Prior art keywords
- air
- preheater
- air preheater
- pipe
- primary
- 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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- 239000000779 smoke Substances 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 abstract description 7
- 239000011593 sulfur Substances 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 4
- 238000009833 condensation Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 238000010410 dusting Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
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- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The utility model discloses an air preheating circulation deashing system, including air heater, the tuber pipe once, the blast pipe, air heater is inside from top to bottom has set gradually low temperature economizer, one-level air preheater, second grade air preheater, tertiary air preheater, level four air preheater, and the tuber pipe passes level four air preheater and one-level air preheater in proper order from the air heater outside and extends to the air heater outside in proper order, and the blast pipe passes tertiary air preheater and second grade air preheater in proper order from the air heater outside and extends to the air heater outside, air preheating circulation deashing system still is equipped with the circulation tuber pipe, and circulation tuber pipe one end links to each other with blast pipe air-out end, and the other end links to each other with an air inlet pipe end, and the circulation tuber pipe is equipped with circulated air adjusting baffle. The air preheating circulating ash removal system is simple in structure and low in cost, the temperature of the four-stage air preheater in the air preheater can be increased, the formation of condensation of sulfur-containing substances is avoided, and the heating surface of the four-stage air preheater is kept clean.
Description
Technical Field
The utility model relates to an air preheating circulation technical field specifically is a circulation dusting system is preheated in air related to.
Background
The air preheater is a heating surface for preheating air before entering the boiler to a certain temperature by smoke in a boiler tail passage through internal radiating fins, and is preheating equipment for improving the heat exchange performance of the boiler and reducing heat loss. The high-temperature flue gas and the heating surface in the air preheater exchange heat step by step, the temperature is reduced gradually, when different furnace types and environment temperatures are adopted, the temperature field of the four-stage air preheater is about 140-plus 150 ℃ sometimes, when high-sulfur fuel is used, because the sulfur-containing substance (the dew point is 147 ℃) in the high-temperature flue gas reaches the dew point temperature when reaching the four-stage air preheater, sulfurous acid is generated and then is combined with ammonia to generate ammonium sulfite, the ammonium sulfite is very strong in viscosity after being combined with ash and is not easy to clean, the four-stage air preheater is easy to generate ash blockage, and the conventional prevention measures are as follows: 1. soot blowing is performed regularly, manual cleaning is performed, labor and force are wasted, and long-period operation of the boiler is influenced; 2. the air heater is additionally arranged at the air inlet, so that the temperature of the four-stage air preheater in the air preheater is increased, the formation of condensation of sulfur-containing substances is avoided, the heating surface is kept clean, a large amount of electric energy is consumed by the air heater, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an air preheating circulation dusting system, this air preheating circulation dusting system simple structure, it is with low costs, can improve the level four air preheater temperature in the air heater, avoid the sulphur material to form the dewfall, keep level four air preheater receiving surface clean.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an air preheating circulating ash removal system comprises an air preheater, a primary air pipe and an air supply pipe, wherein a smoke inlet is formed in the top of the air preheater, an outlet is formed in the bottom of the air preheater, a low-temperature economizer, a primary air preheater, a secondary air preheater, a tertiary air preheater and a quaternary air preheater are sequentially arranged in the air preheater from top to bottom, the primary air pipe sequentially penetrates through the quaternary air preheater and the primary air preheater from the outside of the air preheater and extends to the outside of the air preheater, a primary air adjusting baffle and a primary fan are arranged at the air inlet end of the primary air pipe, the air supply pipe sequentially penetrates through the tertiary air preheater and the secondary air preheater from the outside of the air preheater and extends to the outside of the air preheater, an air supply adjusting baffle and an air feeder are arranged at the air inlet end of the air supply pipe, the air preheating circulating ash removal system is further provided with a circulating air pipe, one end of the circulating, and the circulating air pipe is provided with a circulating air adjusting baffle.
Preferably, the joint of the air inlet ends of the circulating air pipe and the primary air pipe is arranged in front of the primary air adjusting baffle and the primary air fan.
Preferably, the circulating air adjusting baffle is arranged at one side close to the air outlet end of the blast pipe.
Further preferably, a filter screen is arranged at the air inlet end of the air supply pipe.
The utility model discloses the heating surface in high temperature flue gas and the air heater heat transfer step by step, the wind in the air supply pipe reaches the purpose that improves the wind-warm degree through level four air preheater and level one air preheater, the wind in the air supply pipe reaches the purpose that improves the wind-warm degree through level three air preheater and second grade air preheater, link to each other blast pipe air-out end and primary air pipe air inlet end through the circulation tuber pipe, the high-temperature wind that will just pass through the second grade preheater, the reposition of redundant personnel is for microthermal primary air pipe air inlet, reach and improve level four air preheater temperature on original temperature field basis, avoid the sulfur-containing material to form the dewfall, the circulation wind adjusting baffle of circulation tuber pipe is convenient for to the air regulation to in the circulation tuber pipe, circulation tuber pipe and primary air pipe air inlet end junction locate primary air adjusting baffle and primary air fan before, be convenient for to a.
Drawings
Fig. 1 is the schematic view of the air preheating circulating ash removal system of the utility model.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in the attached figure 1, an air preheating circulating ash removal system comprises an air preheater 10, a primary air pipe 20, an air supply pipe 30 and a circulating air pipe 40, wherein a flue gas inlet 11 is arranged at the top of the air preheater 10, an outlet 12 is arranged at the bottom of the air preheater 10, a low-temperature economizer 13, a primary air preheater 14, a secondary air preheater 15, a tertiary air preheater 16 and a quaternary air preheater 17 are sequentially arranged in the air preheater 10 from top to bottom, high-temperature flue gas enters from the flue gas inlet 11 and is subjected to gradual heat exchange with a heated surface in the air preheater 10, the flue gas temperature is gradually reduced and then is discharged from the outlet 12, an air inlet end 21 of the primary air pipe is arranged outside the air preheater 10, cold air enters from the air inlet end 21 of the primary air pipe 20 through a primary air adjusting baffle 22 and a primary air blower 23 and then sequentially passes through the quaternary air preheater 17 and the primary air preheater 14 for preheating, and is introduced to the primary air chamber along with the primary air pipe 20 extending to the outside of the air preheater 10; after being filtered by a filter screen 35 at an air inlet end 31 of the blast pipe, and being regulated by an air feeder 33, cold air passes through a third-stage air preheater 16 and a second-stage air preheater 15 in sequence to be preheated and is led into a hearth along with an air supply pipe 30 extending to the outside of the air preheater 10, one end of a circulating air pipe 40 is connected with an air outlet end 34 of the blast pipe, and the other end of the circulating air pipe is connected with an air inlet end 21 of a primary air pipe, so that high-temperature air which just passes through the second-stage air preheater 15 is distributed to a low-temperature primary air pipe 20 through the circulating air pipe 40 to be fed, thus, the temperature of the air passing through the fourth-stage air preheater 17 is correspondingly increased, the temperature near the fourth-stage air preheater 17 is correspondingly increased, the condensation point of sulfur-containing substances is avoided, a circulating air regulating baffle 41 is arranged at one side close to the air outlet end 34 of the blast pipe to facilitate the air volume regulation in the circulating air pipe, the total air quantity and the air speed of the primary air pipe 20 can be conveniently adjusted.
The utility model discloses the during operation, the high temperature flue gas gets into from flue gas inlet 11 and receives the hot side heat transfer step by step in the air heater 10, the temperature reduces the back gradually and discharges from export 12, wind in the tuber pipe 20 reaches the purpose that improves the wind-warm syndrome through level four air preheater 17 and one-level air preheater 14, wind in the blast pipe 30 reaches the purpose that improves the wind-warm syndrome through level three air preheater 16 and second grade air preheater 15, circulation tuber pipe 40 will just pass through the high temperature wind of second grade preheater 15, the reposition of redundant personnel is for microthermal tuber pipe 20 air intakes, reach the purpose that improves level four air preheater 17 temperature field on original temperature field basis, adjust the hot air volume in the circulation tuber pipe 40 according to production needs, reach and adjust level four air preheater 17 temperature field. The temperature of the four-stage air preheater can be influenced by different furnace types, environment temperatures and operation conditions, and test data show that when the hot air quantity in the circulating air pipe 40 accounts for 17.1% of the total air inlet quantity of primary air and the air speed of the primary air pipe 20 is 28.7m/s, the primary air inlet temperature is increased by about 40 ℃, the temperature field of the four-stage air preheater 17 is increased by about 10 ℃, the dew point temperature is avoided, condensation of sulfur-containing substances is avoided, and the dust accumulation condition is solved through practice inspection.
The embodiment is only an illustration of the concept and implementation of the present invention, and is not a limitation, and the technical solution without substantial transformation is still within the protection scope under the concept of the present invention.
Claims (4)
1. An air preheating circulating ash removal system comprises an air preheater, a primary air pipe and an air supply pipe, wherein a smoke inlet is formed in the top of the air preheater, an outlet is formed in the bottom of the air preheater, a low-temperature economizer, a primary air preheater, a secondary air preheater, a tertiary air preheater and a quaternary air preheater are sequentially arranged inside the air preheater from top to bottom, the primary air pipe sequentially penetrates through the quaternary air preheater and the primary air preheater from the outside of the air preheater and extends to the outside of the air preheater, a primary air adjusting baffle and a primary fan are arranged at the air inlet end of the primary air pipe, the air supply pipe sequentially penetrates through the tertiary air preheater and the secondary air preheater from the outside of the air preheater and extends to the outside of the air preheater, and an air supply adjusting baffle and an air feeder are arranged at the air inlet end of the air supply pipe. And the circulating air pipe is provided with a circulating air adjusting baffle.
2. The air preheating circulating ash removal system of claim 1, wherein the connection between the air inlet end of the circulating air pipe and the air inlet end of the primary air pipe is arranged in front of the primary air adjusting baffle and the primary air fan.
3. The system as claimed in claim 1, wherein the air-preheating circulation ash-removing device is characterized in that the air-circulation adjusting baffle is arranged at the side close to the air outlet end of the blast pipe.
4. The air preheating circulation ash removing system as claimed in claim 1, wherein the air inlet end of the blast pipe is provided with a filter screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020562270.2U CN211952820U (en) | 2020-04-16 | 2020-04-16 | Air preheating circulating ash removal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020562270.2U CN211952820U (en) | 2020-04-16 | 2020-04-16 | Air preheating circulating ash removal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211952820U true CN211952820U (en) | 2020-11-17 |
Family
ID=73164972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020562270.2U Active CN211952820U (en) | 2020-04-16 | 2020-04-16 | Air preheating circulating ash removal system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211952820U (en) |
-
2020
- 2020-04-16 CN CN202020562270.2U patent/CN211952820U/en active Active
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