CN207146439U - A kind of air preheat structure of station boiler - Google Patents
A kind of air preheat structure of station boiler Download PDFInfo
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- CN207146439U CN207146439U CN201720990691.3U CN201720990691U CN207146439U CN 207146439 U CN207146439 U CN 207146439U CN 201720990691 U CN201720990691 U CN 201720990691U CN 207146439 U CN207146439 U CN 207146439U
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- air
- air preheater
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- temperature zone
- high temperature
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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 provides a kind of air preheat structure of station boiler reasonable in design, can effectively solve the problem that air preheater low temperature blocks present situation.The air preheat structure of the station boiler, including denitrification apparatus, economizer, air-introduced machine, pressure fan, rotary regenerative air preheater, gas approach, exhanst gas outlet, air intlet and air outlet slit, in addition to No.1 soot blower and No. two soot blowers；Rotary regenerative air preheater is divided into air preheater high temperature section and air preheater low-temperature zone, and air preheater high temperature section is located above air preheater low-temperature zone；Gas approach, denitrification apparatus, economizer, air preheater high temperature section, air preheater low-temperature zone, air-introduced machine, exhanst gas outlet are sequentially connected by pipeline；Air intlet, pressure fan, air preheater low-temperature zone, air preheater high temperature section, air outlet slit are sequentially connected by pipeline；No.1 soot blower is installed on air preheater low-temperature zone import, and No. two soot blowers are installed on the outlet of air preheater low-temperature zone.
Description
Technical field
It the utility model is related to air preheating system, and in particular to a kind of air preheat structure of station boiler.
Background technology
The air preheater of station boiler be utilize boiler back end ductwork in flue gas by enter boiler before air preheat
To the device of certain temperature, for improving the heat exchange performance of boiler, energy expenditure is reduced.Machine more than 300MW grades at present
Group all uses rotary regenerative air preheater substantially.Rotary regenerative air preheater has heat transfer coefficient height, small volume, in light weight, cloth
Put flexible, complicated, manufacturing process and require the features such as high.Rotary regenerative air preheater heat accumulating element height is general from top to down
For high temperature section, middle-temperature section and low-temperature zone, lowermost is low-temperature zone, and its heat accumulating element is the corrosion-resistant heat transfer element of low-alloy, remaining
High temperature section heat accumulating element is carbon steel.
Under the increasingly strict situation of environmental protection standard, in order to meet the qualified discharge of nitrogen oxides, Thermal generation unit is big
Scale implements SCR denitration transformation of facility.Part the escaping of ammonia necessarily occurs in running for SCR denitration mode, and the ammonia of escape is in air
In preheater with SO3Generate hydrogen sulfate ammonia.Because hydrogen sulfate ammonia physical property is relatively viscous, dust in flue gas is easily adsorbed, causes air
Preheater blocks, and has a strong impact on the safe and stable operation of unit.
Dust stratification blocks the low-temperature zone and medium temperature pars infrasegmentalis for typically occurring in the minimum air preheater of wall temperature.To prevent dust stratification
Air preheater is blocked, ensures the unimpeded of heating surface, air preheater wants supporting installation soot blower.It is pre- that soot blower is arranged on air
Hot device cold end smoke outlet.In the range of the purging of soot blower, due to the timely purging of soot blower, clogging unobvious.
The soot blowing ability of soot blower is limited by blowing pressure and the soot blowing frequency, can only be ensured the soot blowing effect in the range of purging, be blown at present
The purging scope of grey device is below air preheater low-temperature zone height, it is impossible to the unimpeded of air preheater is effectively ensured.
At present, part power plant blocks situation for air preheater, increases the blowing pressure and the soot blowing frequency of soot blower.But
It is to be proved by theory and practice, the excessive raising of soot blower frequency of use and boiler sootblowing steam pressure, corrugated plating can be caused long-term
Abnormal stress, cause corrugated plating to be in fatigue state, and final cracked, disrepair phenomenon, reduce the use of air preheater
Life-span.
Utility model content
The purpose of this utility model is to overcome above shortcomings in the prior art, and provides a kind of structure design and close
The air preheat structure of the station boiler of reason, it can effectively solve the problem that air preheater low temperature blocks present situation.
The technical scheme in the invention for solving the above technical problem is：A kind of air preheat structure of station boiler,
Including denitrification apparatus, economizer, air-introduced machine, pressure fan, rotary regenerative air preheater, gas approach, exhanst gas outlet, air intlet
And air outlet slit；It is characterized in that：Also include No.1 soot blower and No. two soot blowers, the rotary regenerative air preheater are divided into sky
Air preheater high temperature section and air preheater low-temperature zone, air preheater high temperature section are located above air preheater low-temperature zone；Cigarette
Gas import, denitrification apparatus, economizer, air preheater high temperature section, air preheater low-temperature zone, air-introduced machine, exhanst gas outlet pass through
Pipeline is sequentially connected；Air intlet, pressure fan, air preheater low-temperature zone, air preheater high temperature section, air outlet slit pass through pipe
Road is sequentially connected；The No.1 soot blower is installed on air preheater low-temperature zone import, and No. two soot blowers are installed on air
Preheater low-temperature zone exports.So that flue gas is pre- by denitrification apparatus, air preheater high temperature section, air from gas approach
Hot device low-temperature zone, most of heat transfer in flue gas give air preheater high temperature section；It is pre- that dust stratification blocking typically occurs in air
Hot device low-temperature zone, so the inlet and outlet in air preheater low-temperature zone are respectively equipped with soot blower, considerably reduces air preheat
The possibility that device dust stratification blocks.
Preferably, the air preheater high temperature section is connected with air preheater low-temperature zone, air preheater high temperature section
It is connected between air preheater low-temperature zone by flue and air channel.
Preferably, the denitrification apparatus is SCR denitration device.
Preferably, the No.1 soot blower and No. two soot blowers are steam sootblower.
The utility model compared with prior art, has advantages below and effect：Original rotary regenerative air preheater is split
For two-stage, one-level is air preheater high temperature section, and flue-gas temperature is high, and dust stratification stopping state is not serious, still according to present main flow
Design is arranged；Another level is air preheater low-temperature zone, can Reasonable adjustment height, flue-gas temperature is low, produce low-temperature corrosion
And the probability that dust stratification blocks is big, now, increasing soot blower in the inlet and outlet of low-temperature zone, timely soot blowing blows off the dust stratification of absorption,
The unimpeded of rotary regenerative air preheater is effectively ensured.
Brief description of the drawings
Fig. 1 is the main structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, and following examples are pair
It is of the present utility model explanation and the utility model is not limited to following examples.
Embodiment：
Referring to Fig. 1, a kind of air preheat structure of station boiler, including denitrification apparatus 1, economizer 2, air-introduced machine 6, air-supply
Machine 7, primary air fan 8, gas approach, exhanst gas outlet, air intlet, air outlet slit, air preheater high temperature section 3, air preheat
9, No. two device low-temperature zone 4, No.1 soot blower soot blowers 5.Denitrification apparatus 1 is SCR denitration device, and No.1 soot blower 9 and No. two are blown
Grey device 5 is steam sootblower.
Air preheater high temperature section 3 and air preheater low-temperature zone 4 are arranged in boiler flue after connecting.Gas approach,
Denitrification apparatus 1, economizer 2, air preheater high temperature section 3, air preheater low-temperature zone 4, air-introduced machine 6, exhanst gas outlet pass through pipe
Road is sequentially connected.Air intlet, pressure fan 7, primary air fan 8, air preheater low-temperature zone 4, air preheater high temperature section 3, sky
Gas outlet is sequentially connected by pipeline.After the flue gas entered from gas approach is via denitrification apparatus 1 and economizer 2, air is reached
Preheater high temperature section 3, air preheater low-temperature zone 4 is reached after heat exchange cooling, be to prevent dust stratification from blocking up in air preheater low-temperature zone 4
Plug, using the soot blowing of soot blower 5, by afterbody equipment after heat exchange cooling（Deduster etc.）Air-introduced machine 6 is reached, is gone out eventually through flue gas
Mouth is discharged into air into chimney；The cold air that air intlet enters is low by pressure fan 7, primary air fan 8, air preheater respectively
Temperature section 4 and air preheater high temperature section 3, burner hearth is eventually sent to by air outlet slit after heat absorption heating and participates in burning.
As described in flue gas flows through direction, air preheater high temperature section 3 is placed in the top of air preheater low-temperature zone 4, flue gas
In most of heat transfer to air preheater high temperature section 3.Dust stratification is blocked and typically occurred under air preheater low-temperature zone 4
Portion, No.1 soot blower 9 is provided with the import of air preheater low-temperature zone 4, No. two are provided with the outlet of air preheater low-temperature zone 4
Soot blower 5, in the presence of two soot blowers, the possibility that dust stratification blocks in air preheater greatly reduces.No.1 soot blowing
The number of device 9 and No. two soot blowers 5 is calculated according to the diameter of rotary regenerative air preheater and determined.
Connected between air preheater high temperature section 3 and air preheater low-temperature zone 4 by flue and air channel, make cigarette wind and sky
Gas system keeps a normal loop.The air inlet duct of air preheater low-temperature zone 3 is connected in boiler supply air system.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and the principle described according to the utility model patent design are done, are wrapped
Include in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to the scope of protection of the utility model.
Claims (4)
1. a kind of air preheat structure of station boiler, including denitrification apparatus, economizer, air-introduced machine, pressure fan, swinging air
Preheater, gas approach, exhanst gas outlet, air intlet and air outlet slit；It is characterized in that：Also include No.1 soot blower and No. two
Soot blower, the rotary regenerative air preheater are divided into air preheater high temperature section and air preheater low-temperature zone, air preheater
High temperature section is located above air preheater low-temperature zone；Gas approach, denitrification apparatus, economizer, air preheater high temperature section, air
Preheater low-temperature zone, air-introduced machine, exhanst gas outlet are sequentially connected by pipeline；Air intlet, pressure fan, air preheater low temperature
Section, air preheater high temperature section, air outlet slit are sequentially connected by pipeline；It is low that the No.1 soot blower is installed on air preheater
Temperature section import, No. two soot blowers are installed on the outlet of air preheater low-temperature zone.
2. the air preheat structure of station boiler according to claim 1, it is characterised in that：The air preheater high temperature
Section is connected with air preheater low-temperature zone, passes through flue and air channel between air preheater high temperature section and air preheater low-temperature zone
Connection.
3. the air preheat structure of station boiler according to claim 1, it is characterised in that：The denitrification apparatus is SCR
Denitrification apparatus.
4. the air preheat structure of station boiler according to claim 1, it is characterised in that：The No.1 soot blower and two
Number soot blower is steam sootblower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720990691.3U CN207146439U (en) | 2017-08-09 | 2017-08-09 | A kind of air preheat structure of station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720990691.3U CN207146439U (en) | 2017-08-09 | 2017-08-09 | A kind of air preheat structure of station boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207146439U true CN207146439U (en) | 2018-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720990691.3U Active CN207146439U (en) | 2017-08-09 | 2017-08-09 | A kind of air preheat structure of station boiler |
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| CN (1) | CN207146439U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028569A (en) * | 2018-09-09 | 2018-12-18 | 无锡博众热能环保设备有限公司 | A kind of flue gas complete alternation hot-blast stove |
| CN113877731A (en) * | 2021-09-22 | 2022-01-04 | 安徽金轩科技有限公司 | Method for preventing low-temperature section from blocking and scaling of air preheater of circulating fluidized bed boiler |
-
2017
- 2017-08-09 CN CN201720990691.3U patent/CN207146439U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028569A (en) * | 2018-09-09 | 2018-12-18 | 无锡博众热能环保设备有限公司 | A kind of flue gas complete alternation hot-blast stove |
| CN109028569B (en) * | 2018-09-09 | 2024-01-05 | 无锡博众热能环保设备有限公司 | Flue gas full-cycle hot-blast stove |
| CN113877731A (en) * | 2021-09-22 | 2022-01-04 | 安徽金轩科技有限公司 | Method for preventing low-temperature section from blocking and scaling of air preheater of circulating fluidized bed boiler |
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