CN107420929A - A kind of air preheater exhaust gas temperature control system - Google Patents
A kind of air preheater exhaust gas temperature control system Download PDFInfo
- Publication number
- CN107420929A CN107420929A CN201710496295.XA CN201710496295A CN107420929A CN 107420929 A CN107420929 A CN 107420929A CN 201710496295 A CN201710496295 A CN 201710496295A CN 107420929 A CN107420929 A CN 107420929A
- Authority
- CN
- China
- Prior art keywords
- temperature
- air
- flue
- gas temperature
- air preheater
- 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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Classifications
-
- 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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The present invention provides a kind of air preheater exhaust gas temperature control system, including air-introduced machine control unit, pressure fan control unit, the first temperature sensor of smoke evacuation, controller；First temperature sensor is fixed on the downstream that flue is in air preheater；First temperature sensor detects the flue-gas temperature from air preheater discharge, and the temperature is sent into controller；The current flue-gas temperature received is compared the controller with the temperature set, as temperature exceedes set temperature value, then controls air-introduced machine control unit and increases air-introduced machine air inducing dynamics, otherwise then controls pressure fan control unit to increase pressure fan air-supply dynamics.By the first temperature sensor, the flue-gas temperature after air preheater heat exchange is detected, and the control dynamics of air-introduced machine control unit and pressure fan control unit are controlled according to the temperature, controller, so as to which temperature control when flue gas is discharged is in setting range.
Description
Technical field
The present invention relates to denitration of boiler smoke technical field, a kind of specifically air preheater exhaust gas temperature control system.
Background technology
Due to the ripe and high denitration rate of technology, SCR methods worldwide turn into large scale industry boiler smoke
The prevailing technology of denitration.By the end of the year 2010, the denitrating flue gas unit capacity that China has put into operation accounts for coal motor more than 200,000,000 kW
The 28% of pool-size, wherein SCR units account for 95%.
The increase of amount of ammonia slip will promote the formation of ammonium hydrogen sulfate.Ammonium hydrogen sulfate accumulated in air preheater can bring it is certain
The pressure loss and efficiency losses.Flue gas is after SCR reactors and air preheater hot arc, and exhaust gas temperature reduces, when temperature is down to
At less than 185 DEG C, the gaseous sulfuric acid hydrogen ammonium that has been generated in flue gas can solidify on the heat transfer element of cold section of air preheater, cause
Cold section of salification of air preheater and fouling, and then influence the normal fortune of air preheater.
Warm area between 140~230 DEG C is located above cold section of layer of air preheater conventional design and below intermediate layer, due to sulphur
Sour hydrogen ammonium this warm area be liquid to the Solid State Transformation stage, there is extremely strong adsorptivity, a large amount of ash contents can be caused to be sunk in air preheater
Drop, cause air preheater blocking and resistance to rise, blowing out will be forced to clear up air preheater when serious.Meanwhile ammonium hydrogen sulfate or sulfuric acid
Ammonium has stronger corrosivity to metal in itself, can cause the cold section of corrosion of catalyst metals support frame and air preheater.Air preheater blocks
It is increasingly serious with Anticorrosion.
The content of the invention
The invention aims to solve to lack in the prior art that air preheater blocking can be mitigated, use can improve stove effect
Technology the defects of, there is provided a kind of air preheater exhaust gas temperature control system solves the above problems.
To achieve these goals, technical scheme is as follows：
A kind of air preheater exhaust gas temperature control system, including air-introduced machine control unit, pressure fan control unit, the first temperature of smoke evacuation
Sensor, controller；First temperature sensor is fixed on the downstream that flue is in air preheater；First temperature sensor
The flue-gas temperature from air preheater discharge is detected, and the temperature is sent to controller；The controller is current by what is received
Flue-gas temperature is compared with the temperature set, as temperature exceedes set temperature value, then controls air-introduced machine control unit and increases and draws
Blower fan air inducing dynamics, pressure fan control unit is otherwise then controlled to increase pressure fan air-supply dynamics.
Preferably, it is additionally provided with heat-exchange device at the flue outlet.
Preferably, second temperature sensor is further fixed in the downstream of the heat-exchange device, air is discharged into detect
In flue-gas temperature.
Preferably, the second temperature sensor is by currently being discharged into flue-gas temperature in air is sent to controller；Controller
It is compared by the temperature with setting, such as exceedes setting value, then send alarm signal to alarm.
The present invention compared with prior art, has the advantages that：
By the first temperature sensor, the flue-gas temperature after air preheater heat exchange is detected, and according to the temperature, controller control
The control dynamics of air-introduced machine control unit and pressure fan control unit processed, so as to which temperature control when flue gas is discharged is in setting model
In enclosing.
Flue-gas temperature in air is discharged into by the way that second temperature sensor detection is current, controller is according to the temperature, control report
Alert device alarm, so as to remind operating personnel to understand whether the flue-gas temperature being discharged into air meets the requirements in time.
Brief description of the drawings
Fig. 1 is the structured flowchart of the present invention.
Embodiment
The effect of to make to architectural feature of the invention and being reached, has a better understanding and awareness, to preferable
Embodiment and accompanying drawing coordinate detailed description, are described as follows：
As shown in figure 1, a kind of air preheater exhaust gas temperature control system, including air-introduced machine control unit, pressure fan control unit, row
The temperature sensor of cigarette first, controller；First temperature sensor is fixed on the downstream that flue is in air preheater；Described first
Temperature sensor detects the flue-gas temperature from air preheater discharge, and the temperature is sent into controller；The controller will connect
The current flue-gas temperature received is compared with the temperature set, as temperature exceedes set temperature value, then controls air-introduced machine control
Unit increases air-introduced machine air inducing dynamics, otherwise then controls pressure fan control unit to increase pressure fan air-supply dynamics.
Preferably, it is additionally provided with heat-exchange device at the flue outlet.
Preferably, second temperature sensor is further fixed in the downstream of the heat-exchange device, air is discharged into detect
In flue-gas temperature.
Preferably, the second temperature sensor is by currently being discharged into flue-gas temperature in air is sent to controller；Controller
It is compared by the temperature with setting, such as exceedes setting value, then send alarm signal to alarm.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, that described in above-described embodiment and specification is the present invention
Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and
Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its
Equivalent defines.
Claims (4)
- A kind of 1. air preheater exhaust gas temperature control system, it is characterised in that：It is single including air-introduced machine control unit, pressure fan control Member, the first temperature sensor of smoke evacuation, controller；First temperature sensor is fixed on the downstream that flue is in air preheater；Institute State the first temperature sensor and detect the flue-gas temperature discharged from air preheater, and the temperature is sent to controller；The control The current flue-gas temperature received is compared device with the temperature set, as temperature exceedes set temperature value, then controls air inducing Machine control unit increases air-introduced machine air inducing dynamics, otherwise then controls pressure fan control unit to increase pressure fan air-supply dynamics.
- A kind of 2. air preheater exhaust gas temperature control system according to claim 1, it is characterised in that：In the flue outlet Place is additionally provided with heat-exchange device.
- A kind of 3. air preheater exhaust gas temperature control system according to claim 2, it is characterised in that：Filled in the heat exchange The downstream put is further fixed on second temperature sensor, to detect the flue-gas temperature being discharged into air.
- A kind of 4. air preheater exhaust gas temperature control system according to claim 3, it is characterised in that：The second temperature passes Sensor is by currently being discharged into flue-gas temperature in air is sent to controller；Controller is such as super by being compared with the temperature of setting Setting value is crossed, then sends alarm signal to alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496295.XA CN107420929A (en) | 2017-06-26 | 2017-06-26 | A kind of air preheater exhaust gas temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496295.XA CN107420929A (en) | 2017-06-26 | 2017-06-26 | A kind of air preheater exhaust gas temperature control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107420929A true CN107420929A (en) | 2017-12-01 |
Family
ID=60426137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710496295.XA Pending CN107420929A (en) | 2017-06-26 | 2017-06-26 | A kind of air preheater exhaust gas temperature control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107420929A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54147530A (en) * | 1978-05-10 | 1979-11-17 | Ishikawajima Harima Heavy Ind Co Ltd | Air preheating temperature controller for combustion of air heating furnaces |
| CN202419687U (en) * | 2011-12-15 | 2012-09-05 | 攀钢集团攀枝花钢钒有限公司 | System capable of avoiding low-temperature corrosion of air pre-heater of gas boiler |
| CN202733934U (en) * | 2012-08-01 | 2013-02-13 | 武汉钢铁(集团)公司 | Air preheater |
| CN104033921A (en) * | 2014-06-20 | 2014-09-10 | 国家电网公司 | Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler |
| CN204756992U (en) * | 2015-06-10 | 2015-11-11 | 泉州一露机械科技有限公司 | Boiler flue gas air system |
| CN106224989A (en) * | 2016-07-22 | 2016-12-14 | 河北省电力建设调整试验所 | The method of the stifled ash of ammonium hydrogen sulfate in a kind of online removing coal-burning power plant air preheater |
-
2017
- 2017-06-26 CN CN201710496295.XA patent/CN107420929A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54147530A (en) * | 1978-05-10 | 1979-11-17 | Ishikawajima Harima Heavy Ind Co Ltd | Air preheating temperature controller for combustion of air heating furnaces |
| CN202419687U (en) * | 2011-12-15 | 2012-09-05 | 攀钢集团攀枝花钢钒有限公司 | System capable of avoiding low-temperature corrosion of air pre-heater of gas boiler |
| CN202733934U (en) * | 2012-08-01 | 2013-02-13 | 武汉钢铁(集团)公司 | Air preheater |
| CN104033921A (en) * | 2014-06-20 | 2014-09-10 | 国家电网公司 | Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler |
| CN204756992U (en) * | 2015-06-10 | 2015-11-11 | 泉州一露机械科技有限公司 | Boiler flue gas air system |
| CN106224989A (en) * | 2016-07-22 | 2016-12-14 | 河北省电力建设调整试验所 | The method of the stifled ash of ammonium hydrogen sulfate in a kind of online removing coal-burning power plant air preheater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171201 |