CN209524535U - A kind of air preheater hot wind anti-blocking system based on air-cooler pressurization - Google Patents
A kind of air preheater hot wind anti-blocking system based on air-cooler pressurization Download PDFInfo
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- CN209524535U CN209524535U CN201821911261.9U CN201821911261U CN209524535U CN 209524535 U CN209524535 U CN 209524535U CN 201821911261 U CN201821911261 U CN 201821911261U CN 209524535 U CN209524535 U CN 209524535U
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- 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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Abstract
The utility model discloses a kind of air preheater hot wind anti-blocking systems based on air-cooler pressurization, including air preheater, the air duct Leng Yici, heat primary air road, cold secondary air duct and hot secondary air duct, air preheater includes that a wind separating bin, anti-blocking ash content storehouse, secondary air separating storehouse and fume side divide storehouse；It further include booster fan, pressurization air duct and the anti-blocking air duct of hot wind；Booster fan is located on pressurization air duct, and booster fan outlet is connected to a cold air duct by pressurization air duct, and booster fan import is connected to cold secondary air duct or directly and atmosphere by pressurization air duct；The anti-blocking air duct one end of hot wind is connected to heat primary air road, and the other end is connected to anti-blocking ash content storehouse.The utility model can avoid the problems such as existing investment of present air preheater hot circulating fan is high, maintenance workload is big, efficiency is low, and influence of the anti-blocking system to exhaust gas temperature that put into operation is small, operational effect easily guarantees that initial outlay and O&M cost can significantly reduce.
Description
Technical field
The utility model relates to a kind of air preheater hot wind anti-blocking systems based on air-cooler pressurization, belong to station boiler
Air preheater anti-blocking technology field.
Background technique
Rotary regenerative air preheater (referred to as " air preheater ") is a kind of heat-exchange apparatus for large-sized station boiler,
Air needed for it heats burning using the heat of boiler smoke, the efficiency of boiler is improved with this.After air preheater,
Flue-gas temperature is generally cooled to 100~150 DEG C by 300~400 DEG C, and respective air temperature is generally heated to 280 by 0~50 DEG C~
380℃。
Air preheater realizes that air side divides continuous heat absorption and the cigarette in storehouse using the rotor continuous rotation for loading heat accumulating element
The continuous heat release in storehouse is divided in gas side, and according to the needs of boiler oil system, air side point storehouse can be further divided into a wind separating bin
With secondary air separating storehouse.
Air preheater focus of attention problem mainly includes stifled ash, air leak rate of air curtain is higher, heat transfer efficiency is low, low-temperature corrosion is tight
Weight, exhaust gas temperature is excessively high, and these problems affect the safety and economy fortune of air preheater and entire boiler system for a long time
Row.
The above problem is long-standing, and mutually promotes, influences each other.In recent years, generally putting into operation with denitrating system,
Air preheater running environment changes, and above-mentioned stifled grey problem becomes especially prominent, administers difficult, complicated.
The denitrating flue gas facility that coal-burning power plant adds at present is mainly based on selective catalytic reduction (SCR) technology.Using
Part SO after SCR denitration process, in flue gas2SO will be oxidized to by denitrating catalyst3, increase SO in flue gas3Volume it is dense
, there is inevitable the escaping of ammonia phenomenon in addition, lead to ammonium hydrogen sulfate (NH in degree4HSO4) etc. by-products a large amount of generations, and improve
Flue gas acid dew point temperature, causes low-temperature corrosion to aggravate.
Above-mentioned by-product ammonium hydrogen sulfate (NH4HSO4) temperature be 146~207 DEG C within the scope of, be in molten, can securely glue
It is attached to air preheater heat accumulating element surface, makes heat accumulating element that corrosion and dust stratification occur, it is final easily to cause stifled ash, to the peace of unit
Row for the national games causes very big hidden danger.Existing part power plant, the country leads to unit load limit because can not solve the problems, such as or alleviating this, very
To by forced-stopping machine.
When exhaust gas temperature is lower than acid dew point, sulfuric acid vapor will condense, and sulfuric acid droplets are attached on cold end heat accumulating element, rotten
Lose heat accumulating element.The acid dew point of flue gas is with SO3The raising of concentration and improve, typically up to 130~160 DEG C.Due to denitrating system
Increase SO2To SO3Conversion ratio, that is, improve SO in flue gas3Concentration, and many power plant are control cost of electricity-generating, practical coal
The sulfur of kind is generally higher than design coal, and therefore, the acid dew point of many power plant is higher than exhaust gas temperature at present, leads to low-temperature corrosion
It is quite prominent to block up ash problem for (acid dew piont corrosion) aggravation.
To solve Ash Blocking in Air Preheater problem, the art has been risen a kind of cold using Cycling hot-blast heating in recent years
End heat accumulating element simultaneously establishes the anti-blocking new technology of high local flow velocities, such as 201721510369.2 disclosure of that of the patent No..It should
Technology can effectively solve Ash Blocking in Air Preheater problem, but newly-increased thermal circulation fan power consumption is higher, and because be chronically at high temperature,
Under dust atmosphere, maintenance workload is relatively also larger.In addition, windage significantly increases, thermal circulation fan if increasing anti-blocking grey air quantity
Total pressure design needs higher, causes blower specific speed relatively low, type selecting and to manufacture and design difficulty larger, and thermal circulation fan efficiency can be compared with
Low, overall cost of ownership significantly increases.
Utility model content
It is asked to solve existing for present air preheater hot circulating fan that investment is high, maintenance workload is big, efficiency is low etc.
Topic, the utility model provide a kind of air preheater hot wind anti-blocking system based on air-cooler pressurization.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows:
It is a kind of based on air-cooler pressurization air preheater hot wind anti-blocking system, including air preheater, the air duct Leng Yici,
Heat primary air road, cold secondary air duct and hot secondary air duct, air preheater include a wind separating bin, anti-blocking ash content storehouse, Secondary Air
Point storehouse and fume side divide storehouse, and the air duct Leng Yici, a wind separating bin and heat primary air road are sequentially communicated, cold secondary air duct, Secondary Air
Fen Cang and hot secondary air duct are sequentially communicated；It further include booster fan, pressurization air duct and the anti-blocking air duct of hot wind；Booster fan is located at increasing
It presses on air duct, booster fan outlet is connected to a cold air duct by pressurization air duct, and booster fan import passes through the connection of pressurization air duct
Cold secondary air duct or directly and atmosphere；The anti-blocking air duct one end of hot wind is connected to heat primary air road, and the other end is connected to anti-blocking ash content
Storehouse.
Applicant it has been investigated that, by adopting the above technical scheme, air preheater First air is entered by a cold air duct
The total air of storehouse heat absorption is divided to increase, in addition to the air quantity and wind-warm syndrome for meeting pulverized coal preparation system require, extra heat in heat primary air road
Wind enters anti-blocking ash content storehouse by the anti-blocking air duct of hot wind, realizes choke preventing function, also that is, the cold wind by booster fan passes through
After wind separating bin heating, it is anti-blocking to be partially or wholly used for air preheater.In general, for the safety for guaranteeing pulverized coal preparation system,
The exchange capability of heat of wind separating bin is relative surplus, the hot wind anti-blocking for air preheater, is obtained by a wind separating bin heating,
Influence to exhaust gas temperature is negligible, and the operation of air preheater hot wind anti-blocking system is more economical.In addition, boiler is primary
Wind allowance can be directly used for that air preheater is anti-blocking, and blocking-proof result mores easily guarantee.
Cold First air is through booster fan reverse flow in order to prevent, when above-mentioned booster fan import passes through the connection of pressurization air duct
When cold secondary air duct, booster fan full design pressure is higher than the static pressure difference of cold First air and cold Secondary Air；When above-mentioned booster fan into
Mouth directly with atmosphere when, booster fan total pressure be higher than cold First air static pressure.Wind in a cold air duct is cold First air, cold
Wind in secondary air duct is cold Secondary Air.
To further prevent cold First air through booster fan reverse flow, cold primary pressurization air duct be equipped with pressurization cold wind every
Exhausted door.When detecting above-mentioned reflux problem, pressurization cold wind isolation door is closed, and otherwise keeps fully open position.
Above-mentioned reverse flow refers to that cold First air flows to booster fan import from booster fan outlet.
The above-mentioned air preheater hot wind anti-blocking system based on air-cooler pressurization, further includes adverse current detection device, and adverse current is examined
Surveying device includes preceding pressure pipe, rear pressure pipe and differential pressure transmitter, preceding pressure pipe and rear pressure pipe be mounted on pressurization air duct and
It is located at booster fan outlet simultaneously or import, the pressure tappings of preceding pressure pipe is arranged windward, pressure connects the positive pressure side of differential pressure transmitter,
The leeward setting of the pressure tappings of pressure pipe afterwards, pressure connect the negative pressure end of differential pressure transmitter.Preceding pressure pipe connects the positive pressure of differential pressure transmitter
End, rear pressure pipe connect the negative pressure end of differential pressure transmitter and then characterize cold First air when buckling of being on duty moves device output negative value and pass through pressurization
Otherwise blower reverse flow illustrates that booster fan works normally, i.e., cold wind flows to booster fan outlet from booster fan import.
When booster fan import is connected to cold secondary air duct by pressurization air duct, in order to facilitate maintenance and maintenance pressurization wind
Machine, and the reliability for preventing cold First air from passing through booster fan reverse flow is improved, pressurization cold wind isolation door includes booster fan
Import completely cuts off door and booster fan outlet isolation door.When booster fan needs to overhaul and safeguard, or when above-mentioned differential pressure changes device
When exporting negative value, booster fan import isolation door and booster fan outlet isolation door are simultaneously closed off.
In order to reach better blocking-proof result, the anti-blocking air duct one end of hot wind is connected to heat primary air road, and the other end leads to anti-blocking
Ash content storehouse entrance.
It is preferred that anti-blocking ash content storehouse outlet is secondary with heat between anti-blocking ash content position in storehouse Yu Yici wind separating bin and secondary air separating storehouse
Air duct connection.
For the flow for adjusting anti-blocking hot wind, the anti-blocking air duct of hot wind is equipped with anti-blocking hot wind and adjusts door.According to actual needs into
Row is adjusted.
The application does not do the structure feature in anti-blocking ash content storehouse and excessively repeats, the disclosed air preheater before applicant
Repeatedly illustrated in the relevant patent document of anti-blocking ash, such as application No. is 201510369487.5,201710698879.5,
201721019416.3, the patent of 201721321397.X, 201711234268.1,201721510369.2 etc. or patent Shen
Please.
The unmentioned technology of the utility model is referring to the prior art.
The air preheater hot wind anti-blocking system that the utility model is pressurized based on air-cooler can avoid present air preheater
The problems such as existing investment of thermal circulation fan is high, maintenance workload is big, efficiency is low, and the anti-blocking system that puts into operation is to exhaust gas temperature
Influence it is small, operational effect easily guarantees, initial outlay and O&M cost can significantly reduce.
Detailed description of the invention
Fig. 1 is 2 system schematic of the utility model embodiment.
Fig. 2 is 3 system schematic of the utility model embodiment.
Fig. 3 is adverse current detection device schematic diagram in the utility model embodiment 3.
In figure: 1 is a cold air duct, and 2 be heat primary air road, and 3 be cold secondary air duct, and 4 be hot secondary air duct, and 5 be pressurization
Blower, 6 are pressurization air duct, and 7 be the anti-blocking air duct of hot wind, and 8 be anti-blocking ash content storehouse, and 9 completely cut off door for pressurization cold wind, and 10 is distinguished and admirable to be pressurized
To 11 be preceding pressure pipe, and 12 be rear pressure pipe, and 13 be differential pressure transmitter, and 14 completely cut off door for booster fan import, and 15 be pressurization wind
Machine outlet isolation door；20 be a wind separating bin, and 21 be secondary air separating storehouse, and 22 divide storehouse for fume side.
Specific embodiment
The utility model in order to better understand furthers elucidate the content of the utility model below with reference to embodiment, but
The content of the utility model is not limited solely to the following examples.
Embodiment 1
It is a kind of based on air-cooler pressurization air preheater hot wind anti-blocking system, including air preheater, the air duct Leng Yici,
Heat primary air road, cold secondary air duct and hot secondary air duct, air preheater include a wind separating bin, anti-blocking ash content storehouse, Secondary Air
Point storehouse and fume side divide storehouse, and the air duct Leng Yici, a wind separating bin and heat primary air road are sequentially communicated, cold secondary air duct, Secondary Air
Fen Cang and hot secondary air duct are sequentially communicated；It further include booster fan, pressurization air duct and the anti-blocking air duct of hot wind；Booster fan is located at increasing
It presses on air duct, booster fan outlet is connected to a cold air duct by pressurization air duct, and booster fan import passes through the connection of pressurization air duct
Cold secondary air duct or directly and atmosphere；The anti-blocking air duct of hot wind is equipped with anti-blocking hot wind and adjusts door, facilitates the stream of anti-blocking hot wind
Amount is adjusted, and the anti-blocking air duct one end of hot wind is connected to heat primary air road, and the other end leads to anti-blocking ash content storehouse entrance；Anti-blocking ash content storehouse outlet
With hot secondary air duct connection；Between anti-blocking ash content position in storehouse Yu Yici wind separating bin and secondary air separating storehouse.
Cold First air is through booster fan reverse flow in order to prevent, when above-mentioned booster fan import passes through the connection of pressurization air duct
When cold secondary air duct, booster fan full design pressure is higher than the static pressure difference of cold First air and cold Secondary Air；When above-mentioned booster fan into
Mouth directly with atmosphere when, booster fan total pressure be higher than cold First air static pressure.
By adopting the above technical scheme, the total air of wind separating bin of air preheater heat absorption is entered by a cold air duct
Increase, in addition to the air quantity and wind-warm syndrome for meeting pulverized coal preparation system require, extra hot wind passes through the anti-blocking air duct of hot wind in heat primary air road
Into anti-blocking ash content storehouse, choke preventing function is realized, also that is, through the cold wind of booster fan after a wind separating bin heats, portion
Point or to be completely used for air preheater anti-blocking.In general, for the safety for guaranteeing pulverized coal preparation system, the exchange capability of heat of a wind separating bin
Relative surplus, anti-blocking for air preheater hot wind is obtained, the influence to exhaust gas temperature by a wind separating bin heating
Negligible, the operation of air preheater hot wind anti-blocking system is more economical.In addition, boiler First air allowance can be directly used for air
Preheater is anti-blocking, and blocking-proof result mores easily guarantee.
Embodiment 2
As shown in Figure 1, it is substantially the same manner as Example 1, except that: to further prevent cold First air through booster fan
Reverse flow, cold primary pressurization air duct are equipped with pressurization cold wind and completely cut off door.When detecting above-mentioned reflux problem, pressurization cold wind every
Exhausted door is closed, and fully open position is otherwise kept.
Embodiment 3
It is substantially the same manner as Example 2, except that: the above-mentioned anti-blocking system of air preheater hot wind based on air-cooler pressurization
System, further includes adverse current detection device as shown in Figure 3, adverse current detection device includes preceding pressure pipe, rear pressure pipe and differential pressure transporting
Device, preceding pressure pipe and rear pressure pipe are mounted on pressurization air duct and are located at booster fan outlet or import simultaneously, preceding pressure pipe
Pressure tappings are arranged windward, and pressure connects the positive pressure side of differential pressure transmitter, the leeward setting of the pressure tappings of rear pressure pipe, and pressure connects differential pressure change
Send the negative pressure end of device.When buckling of being on duty moves device output negative value, then cold First air is characterized by booster fan reverse flow, is otherwise said
Bright booster fan works normally, i.e., cold wind flows to booster fan outlet from booster fan import.
When booster fan import is connected to cold secondary air duct by pressurization air duct, in order to facilitate maintenance and maintenance pressurization wind
Machine, and the reliability for preventing cold First air from passing through booster fan reverse flow is improved, as shown in Fig. 2, pressurization cold wind completely cuts off door packet
Include booster fan import isolation door and booster fan outlet isolation door.When booster fan needs to overhaul and safeguard, or when above-mentioned
When differential pressure changes device output negative value, booster fan import isolation door and booster fan outlet isolation door are simultaneously closed off.
The air preheater hot wind anti-blocking system based on air-cooler pressurization of above-mentioned each example, can avoid present air preheater
The problems such as existing investment of thermal circulation fan is high, maintenance workload is big, efficiency is low, and the anti-blocking system that puts into operation is to exhaust gas temperature
Influence it is small (generally directly affecting less than 1 DEG C), operational effect easily guarantees, initial outlay and O&M cost can significantly reduce.
Claims (8)
1. a kind of air preheater hot wind anti-blocking system based on air-cooler pressurization, including air preheater, the air duct Leng Yici, heat
Air duct, cold secondary air duct and hot secondary air duct, air preheater include a wind separating bin, anti-blocking ash content storehouse, secondary air separating
Storehouse and fume side divide storehouse, and the air duct Leng Yici, a wind separating bin and heat primary air road are sequentially communicated, cold secondary air duct, secondary air separating
Storehouse and hot secondary air duct are sequentially communicated；It is characterized by also including booster fan, pressurization air duct and the anti-blocking air ducts of hot wind；Pressurization
Blower is located on pressurization air duct, and booster fan outlet is connected to a cold air duct by pressurization air duct, and booster fan import passes through increasing
Air duct is pressed to be connected to cold secondary air duct or directly and atmosphere；The anti-blocking air duct one end of hot wind is connected to heat primary air road, and the other end connects
Lead to anti-blocking ash content storehouse.
2. the air preheater hot wind anti-blocking system as described in claim 1 based on air-cooler pressurization, it is characterised in that: work as increasing
When pressure fan import is connected to cold secondary air duct by pressurization air duct, booster fan total pressure is higher than the quiet of cold First air and cold Secondary Air
Pressure difference；When booster fan import directly with atmosphere when, booster fan total pressure be higher than cold First air static pressure.
3. the air preheater hot wind anti-blocking system as claimed in claim 1 or 2 based on air-cooler pressurization, it is characterised in that:
It is pressurized air duct and is equipped with pressurization cold wind isolation door.
4. the air preheater hot wind anti-blocking system as claimed in claim 3 based on air-cooler pressurization, it is characterised in that: also wrap
Include adverse current detection device, adverse current detection device includes preceding pressure pipe, rear pressure pipe and differential pressure transmitter, preceding pressure pipe and rear pressure
Pipe is mounted on pressurization air duct and simultaneously positioned at booster fan outlet or import, the pressure tappings of preceding pressure pipe to be arranged windward, pressure
The positive pressure side of differential pressure transmitter, the leeward setting of the pressure tappings of rear pressure pipe are connect, pressure connects the negative pressure end of differential pressure transmitter.
5. the air preheater hot wind anti-blocking system as claimed in claim 3 based on air-cooler pressurization, it is characterised in that: pressurization
Cold wind isolation door includes booster fan import isolation door and booster fan outlet isolation door.
6. the air preheater hot wind anti-blocking system as claimed in claim 1 or 2 based on air-cooler pressurization, it is characterised in that:
The anti-blocking air duct of hot wind is equipped with anti-blocking hot wind and adjusts door.
7. the air preheater hot wind anti-blocking system as claimed in claim 1 or 2 based on air-cooler pressurization, it is characterised in that:
Between anti-blocking ash content position in storehouse Yu Yici wind separating bin and secondary air separating storehouse, anti-blocking ash content storehouse outlet and hot secondary air duct connection.
8. the air preheater hot wind anti-blocking system as claimed in claim 7 based on air-cooler pressurization, it is characterised in that: hot wind
Anti-blocking air duct one end is connected to heat primary air road, and the other end leads to anti-blocking ash content storehouse entrance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821911261.9U CN209524535U (en) | 2018-11-20 | 2018-11-20 | A kind of air preheater hot wind anti-blocking system based on air-cooler pressurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821911261.9U CN209524535U (en) | 2018-11-20 | 2018-11-20 | A kind of air preheater hot wind anti-blocking system based on air-cooler pressurization |
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| CN209524535U true CN209524535U (en) | 2019-10-22 |
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ID=68211699
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819481A (en) * | 2021-08-30 | 2021-12-21 | 浙江兴核智拓科技有限公司 | Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method |
-
2018
- 2018-11-20 CN CN201821911261.9U patent/CN209524535U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819481A (en) * | 2021-08-30 | 2021-12-21 | 浙江兴核智拓科技有限公司 | Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method |
| CN113819481B (en) * | 2021-08-30 | 2024-08-09 | 浙江兴核智拓科技有限公司 | Anti-blocking rotary air preheater based on cyclic circulation temperature rising and purging and anti-blocking method |
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