CN202219136U - Denitration system applied to cement industry - Google Patents
Denitration system applied to cement industry Download PDFInfo
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- CN202219136U CN202219136U CN2011202079787U CN201120207978U CN202219136U CN 202219136 U CN202219136 U CN 202219136U CN 2011202079787 U CN2011202079787 U CN 2011202079787U CN 201120207978 U CN201120207978 U CN 201120207978U CN 202219136 U CN202219136 U CN 202219136U
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Abstract
The utility model discloses a denitration system applied to the cement industry, which comprises an ammonia preparation subsystem, a selective catalyctic reduction reaction subsystem, an ammonia dilution and spray subsystem, a cooling subsystem and a programmable controller and is characterized in that the ammonia preparation subsystem comprises a liquid ammonia storage tank, an evaporator, a buffer tank and a flow meter; the ammonia dilution and spray subsystem comprises a dilution fan, an ammonia/air mixer, a spray grid and a static mixer; and the programmable controller controls all the subsystems. According to the denitration system, the programmable controller is adopted to optimize the operational parameters of the selective catalyctic reduction reactor, the subsystems are effectively controlled, and the catalyst blocking is prevented. The cooling subsystem can ensure that the catalyst operates within a most appropriate temperature range.
Description
Technical field
The utility model relates to the gas denitrifying technology field, particularly cement industry denitration technology, specifically a kind of denitrating system that is applied in cement industry.
Background technology
In the flue-gas denitration process technology, mainly contain two big types of selective-catalytic-reduction denitrified technology and SNCR denitrating techniques.The SNCR denitrating technique in burner hearth 900～1100 these narrow temperature ranges, under the catalyst-free effect, optionally reduces the NOx in the flue gas through spraying into reducing agents such as urea liquid or ammoniacal liquor; Selective-catalytic-reduction denitrified technology, under the effect of catalyst, reducing agent NH
3Can under relatively low temperature,, optionally NOx be reduced into N like 300～450 degree
2Two kinds of technologies are compared, and the reaction temperature that the latter needs is low, and denitration efficiency is high, and ammonia is escaped low, stable, can consider to be applied in cement industry.
But the cement industry flue gas because temperature is high, dust concentration is big, causes catalyst to be prone to situation such as inefficacy, obstruction.A lot of trials have been done to the cement industry denitration technology by a lot of mechanisms, but DeGrain, original problem still exists.
Summary of the invention
What the utility model will solve is the problems referred to above that prior art exists; Aim to provide a kind of denitrating system that is applied in cement industry; It is through adopting Programmable Logic Controller optimized choice property catalytic reduction reactor operational factor; And each subsystem control effectively, make cement plant flue gas denitrification system safety, stable, operation efficiently, and avoid catalyst to be prone to problems such as inefficacy, obstruction.
For addressing the above problem; The utility model adopts following technical scheme: a kind of denitrating system that is applied in cement industry; Comprise that ammonia prepares subsystem, selective catalytic reduction reaction subsystem, ammonia dilution injection subsystem, cooling subsystem and Programmable Logic Controller; It is characterized in that described ammonia prepares subsystem and comprises liquid ammonia storage tank, evaporimeter, surge tank and flowmeter; Described ammonia dilution injection subsystem comprises dilution blower fan, ammonia/air mixer, sprays grid and static mixer, and described Programmable Logic Controller is controlled above-mentioned each subsystem respectively.
The denitrating system that is applied in cement industry of the utility model has following characteristics:
The flue gas of 1, coming from the cement furnace side enters into the flue of denitrating system; Evenly mix with the ammonia/air gas mixture that is uniformly distributed with through the injection grid, make flue gas more even, get into the selective catalytic reduction reaction subsystem then through static mixer; Under catalytic action; Oxidation-reduction reaction takes place in the NOx in ammonia and the flue gas, through regulating ammonia flow, makes denitration efficiency remain on setting value.
2. adopt the operational factor of Programmable Logic Controller optimized choice property catalytic reduction reaction subsystem, can reduce the influence of dust to greatest extent catalyst.
3. after flue-gas temperature surpasses the catalyst Applicable temperature, launch the cooling subsystem, temperature is dropped within the setting range.
4, judge adjusting ammonia emitted dose through denitration efficiency.
The denitrating system that is applied in cement industry of the utility model adopts Programmable Logic Controller optimized choice property catalytic reduction reactor operational factor, and each subsystem is control effectively, and can avoid catalyst to stop up.The cooling subsystem can guarantee that catalyst is operated in only temperature range.
According to the utility model, described cooling subsystem is arranged on the upper reaches of flue, and is positioned at the upper reaches of said injection grid; Described dilution blower fan, ammonia/air mixer, injection grid are connected successively through pipeline with static mixer, and finally are connected to described selective catalytic reduction reaction subsystem; Described liquid ammonia storage tank, evaporimeter, surge tank and flowmeter are connected through pipeline successively, and finally are connected to described ammonia/air mixer.
Described selective catalytic reduction reaction subsystem comprises scr reactor, 1～3 layer of catalyst of described scr reactor set inside.
Described selective catalytic reduction reaction subsystem also comprises efficient soot blower system.After the selective catalytic reduction reaction subsystem moves a period of time; Unavoidably having some dust accumulates on the catalyst surface; Can influence catalytic reaction like this carries out; At this moment start efficient soot blower system, the bottom ash bucket is removed and fallen into to superficial dust, make catalytic reaction maintain high efficiency levels all the time.Judge the cycle of controlling efficient soot blower system through the ammonia escape, guarantee that catalyst can not cause dust stratification.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the structured flowchart of the utility model.
Among the figure, the former flue gas of 1-, the 2-subsystem of lowering the temperature, 3-sprays grid; The 4-static mixer, the efficient soot blower system of 5-, 6-SCR device, the clean flue gas of 7-; The 8-liquid ammonia storage tank, 9-evaporimeter, 10-surge tank, 11-ammonia/air mixer; 12-dilutes blower fan, 13-flue, 14-Programmable Logic Controller, 15-flowmeter.
The specific embodiment
With reference to Fig. 1, the denitrating system that is applied in cement industry of the utility model comprises that ammonia prepares subsystem, selective catalytic reduction reaction subsystem, ammonia dilution injection subsystem, cooling subsystem 2 and Programmable Logic Controller 14.
Described ammonia prepares subsystem and comprises liquid ammonia storage tank 8, evaporimeter 9, surge tank 10 and flowmeter 15, and this subsystem can prepare the ammonia of setting pressure reliably.
Described ammonia dilution injection subsystem comprises dilution blower fan 12, ammonia/air mixer 11, sprays grid 3 and static mixer 4, this subsystem can guarantee flue gas mix with ammonia fully, even.
Described Programmable Logic Controller 14 is PLC or DCS, controls above-mentioned each subsystem respectively.After entrance flue gas temperature surpasses the catalyst Applicable temperature, launch the cooling subsystem, make temperature drop to setting range and so on; Judge adjusting ammonia emitted dose through denitration efficiency; Judge the cycle of the efficient soot blower system of control through the ammonia escape.
Described cooling subsystem 2 is arranged on the upper reaches of flue 13, and is positioned at the upper reaches of said injection grid 3; Described dilution blower fan 12, ammonia/air mixer 11, spray grid 3 and static mixer 4 and be connected successively, and finally be connected to described selective catalytic reduction reaction subsystem through pipeline; Described liquid ammonia storage tank 8, evaporimeter 9, surge tank 10 and flowmeter 15 are connected through pipeline successively, and finally are connected to described ammonia/air mixer 11.
Described selective catalytic reduction reaction subsystem comprises scr reactor 6 and efficient soot blower system 5.1～3 layer of catalyst of described scr reactor 6 set inside.Adopt efficient soot blower system 5, guarantee that catalyst can not cause dust stratification.
The denitrating system that is applied in cement industry of the utility model, its control method is: through DCS or PLC each is controlled parameter monitoring, guarantee denitrating system stable operation.Make denitration efficiency remain on setting value through regulating the ammonia emitted dose; Through controlling the cycle of efficient soot blower system, catalyst is kept clean, guarantee that catalyst keeps efficient operation; Make the catalytic reaction temperature maintenance in the scope of application through regulating the cooling water yield.
What should be understood that is: the foregoing description is just to the explanation of the utility model, rather than to the restriction of the utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the utility model.
Claims (4)
1. denitrating system that is applied in cement industry; Comprise that ammonia prepares subsystem, selective catalytic reduction reaction subsystem, ammonia dilution injection subsystem, cooling subsystem (2) and Programmable Logic Controller (14); It is characterized in that described ammonia prepares subsystem and comprises liquid ammonia storage tank (8), evaporimeter (9), surge tank (10) and flowmeter (15); Described ammonia dilution injection subsystem comprises dilution blower fan (12), ammonia/air mixer (11), sprays grid (3) and static mixer (4), and described Programmable Logic Controller (14) is controlled above-mentioned each subsystem respectively.
2. the denitrating system that is applied in cement industry as claimed in claim 1 is characterized in that described cooling subsystem (2) is arranged on the upper reaches of flue (13), and is positioned at the upper reaches of said injection grid (3); Described dilution blower fan (12), ammonia/air mixer (11), injection grid (3) are connected successively through pipeline with static mixer (4), and finally are connected to described selective catalytic reduction reaction subsystem; Described liquid ammonia storage tank (8), evaporimeter (9), surge tank (10) and flowmeter (15) are connected through pipeline successively, and finally are connected to described ammonia/air mixer (11).
3. the denitrating system that is applied in cement industry as claimed in claim 1; It is characterized in that described selective catalytic reduction reaction subsystem comprises scr reactor (6), 1～3 layer of catalyst of described scr reactor (6) set inside.
4. the denitrating system that is applied in cement industry as claimed in claim 3 is characterized in that described selective catalytic reduction reaction subsystem also comprises efficient soot blower system (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202079787U CN202219136U (en) | 2011-06-20 | 2011-06-20 | Denitration system applied to cement industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202079787U CN202219136U (en) | 2011-06-20 | 2011-06-20 | Denitration system applied to cement industry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202219136U true CN202219136U (en) | 2012-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202079787U Expired - Fee Related CN202219136U (en) | 2011-06-20 | 2011-06-20 | Denitration system applied to cement industry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921297A (en) * | 2012-11-21 | 2013-02-13 | 江苏中建材环保研究院有限公司 | SCR denitrification device for dedusting smoke of cement kiln at high temperature |
| CN106039968A (en) * | 2016-07-20 | 2016-10-26 | 梁广添 | Nitrogen oxide treatment system and nitrogen oxide treatment process |
| CN107185376A (en) * | 2017-06-14 | 2017-09-22 | 山西大学 | A kind of flue gas reuse reinforcing SNCR combines SCR denitrating system |
-
2011
- 2011-06-20 CN CN2011202079787U patent/CN202219136U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921297A (en) * | 2012-11-21 | 2013-02-13 | 江苏中建材环保研究院有限公司 | SCR denitrification device for dedusting smoke of cement kiln at high temperature |
| CN106039968A (en) * | 2016-07-20 | 2016-10-26 | 梁广添 | Nitrogen oxide treatment system and nitrogen oxide treatment process |
| CN107185376A (en) * | 2017-06-14 | 2017-09-22 | 山西大学 | A kind of flue gas reuse reinforcing SNCR combines SCR denitrating system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20180620 |
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| CF01 | Termination of patent right due to non-payment of annual fee |