CN203132366U - Selective non-catalytic reduction (SNCR) denitration system for dry method cement production line - Google Patents
Selective non-catalytic reduction (SNCR) denitration system for dry method cement production line Download PDFInfo
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- CN203132366U CN203132366U CN 201320097985 CN201320097985U CN203132366U CN 203132366 U CN203132366 U CN 203132366U CN 201320097985 CN201320097985 CN 201320097985 CN 201320097985 U CN201320097985 U CN 201320097985U CN 203132366 U CN203132366 U CN 203132366U
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Abstract
The utility model relates to a selective non-catalytic reduction (SNCR) denitration system for a dry method cement production line. The SNCR denitration system comprises a combustion chamber, a vertical flue and a cement decomposing furnace mixing flue, wherein the vertical flue is arranged between a rotary kiln outlet and a decomposing furnace, spray gun systems are respectively arranged on the combustion chamber, the vertical flue between the rotary kiln outlet and the decomposing furnace and the cement decomposing furnace mixing flue, and the spraying gun systems are combined into an ejecting system. The ejecting system is connected with a reduction material supplying system which comprises a fixed mixer and an air compressor, wherein the fixed mixer and the air compressor are connected with the ejecting system. One path of the fixed mixer is connected with a water diluting tank, and the other path of the fixed mixer is connected with a reducing agent solution buffer tank which is also connected with a urea soluble tank and an ammonia water storage tank. A spraying gun sleeve accumulated dust sweeping device avoids the condition that the system cannot operate due to dust accumulated in the sleeve. The SNCR denitration system greatly improves the stability and reduces system operation cost.
Description
Technical field
The utility model relates to the cement kiln control technology that discharges pollutants, and relates in particular to a kind of cement kiln flue gas denitrification system that efficiently removes nitrogen oxide under given conditions.
Background technology
At present, China has nearly 5000 families of cement production enterprise, and output occupies first place, the world for years.Whole nation accumulative total cement total output was 18.7 hundred million tons in 2010, and wherein, new type nonaqueous cement proportion reaches 80%.Data show, by the end of the year in 2010, adopt the new type nonaqueous cement production line of domestic technique and equipment build-up to reach more than 1300, produce 4000 tons, 5000 tons cement producing lines daily and account for about 60%, amount to more than 800 production line.
During " 12 ", nitrogen oxide is put into restrictive index system, requires total emission volumn to cut down 10%.The discharge capacity of cement industry nitrogen oxide accounts for about 17% of national industrial discharge total amount, has been to occupy thermal power generation, vehicle exhaust the third-largest discharged nitrous oxides rich and influential family afterwards, and concentration of emission is generally at 800～1100mg/Nm
3, than international most advanced level big gap is arranged.Ministry of Industry and Information is especially at cement industry atmosphere pollution present situation, " about the instruction of cement industry energy-saving and emission-reduction " issued in formulation, require the cement industry nitrogen oxide to reduce by 25% to " 12 " are last on basis in 2009, require newly-built or reorganization and expansion cement (grog) production line project must dispose denitrification apparatus.Manufacture of cement project nitrogen oxide emission standard greatly improves.
Because discharge capacitys in 2011 go up not down, more allow the nitrogen oxide of the cement industry carrying of starting late reduce discharging the pressure upgrading.On December 15th, 2011; State Council has formally put into effect promulgated by the State Council (2011) No. 42 " national environmental protection " 12 " planning "; clear and definite cement sectors are one of key industry of falling the nitrogen denitration; target and measure that the nitrogen denitration falls in cement industry have been established, with the prevention and cure of pollution of further reinforcement nitrogen oxide.Undoubtedly, cement industry will become China's nitrogen oxide control major fields during " 12 ".
For the cement industry flue gas, adopt SCR(selective catalytic reduction, SCR), although denitration efficiency is very high, but SCR need use and consume expensive noble metal catalyst, and because the dust concentration of cement production enterprise waste gas is very high, alkali metal content is higher, easily make catalyst poisoning and obstruction, so the nitrogen oxide that the SCR technology is used for cement kiln reduces discharging prematurity still.Facts have proved SNCR(selective non-catalytic reduction, SNCR) be the best approach that is fit to the cement plant denitration.
Summary of the invention
At above-mentioned existing cement industry gas denitrifying technology, the purpose of this utility model is at corresponding cement producing line, a kind of SNCR denitrating system for dry cement production line is provided, can have adapted to the manufacture of cement working conditions change more when improving original denitration efficiency.
The utility model is achieved through the following technical solutions:
A kind of SNCR denitrating system for dry cement production line, comprise the combustion chamber, vertical flue between rotary kiln outlet and the dore furnace, cement decomposing furnace mixing flue, the combustion chamber, vertical flue between rotary kiln outlet and the dore furnace, be respectively equipped with gun system on the cement decomposing furnace mixing flue, each gun system also becomes spraying system, spraying system links to each other with reducing agent supplied materials system, described reducing agent supplied materials system comprises static mixer and the air compressor that is connected with spraying system, static mixer one tunnel connects another road of dilution water pot and connects the reductant solution surge tank, and the reductant solution surge tank is connected with urea dissolving tank and ammoniacal liquor holding vessel simultaneously.
Be furnished with the multilayer gun system respectively on vertical flue between the outlet of described combustion chamber, rotary kiln and the dore furnace, the cement decomposing furnace mixing flue.
Described gun system comprises spray gun, and spray gun is provided with pneumatic propelling unit and sleeve, and pneumatic propelling unit links to each other with air atomizer.
Described spray gun and sleeve gap location are provided with the dust stratification blow device.
Described dust stratification blow device is to be arranged in spray gun air outside big gun, is used for purging the dust stratification in spray gun sleeve space.
Described reducing agent supplied materials system is provided with the control module that the conversion reducing agent adds kind.
The utility model is considered at characteristics and the convenient of enterprise practical operation of cement industry flue gas, is adopted two kinds of urea and ammoniacal liquor, as the reducing agent of denitration, based on ammoniacal liquor.Be obstructed or the supply of otherwise reason ammoniacal liquor is when going wrong when ammoniacal liquor transportation, can adopt urea as an alternative, two kinds of reducing agents can carry out electronic switching as required.
When being reducing agent with urea, the packed urea of finished product is transported to denitrating technique equipment room urea memory block by transport vehicle and stores.Packed urea is delivered to the dissolving tank platform by cucurbit, adopts the manual type unpacking and pours dissolving tank at platform.Dissolving water and urea accelerate the dissolving of urea in the dissolving in-tank mixing by agitator and steam-heated mode.By valve control confluent and urea supply amount, prepare certain density urea liquid.
Urea liquid after the dissolving is delivered to surge tank by the urea liquid supply pump and stores for future use.
In order to improve the efficient of cement denitrating flue gas, according to corresponding calculating and test, respectively at the position with suitable temperature window of the kiln tail uptake flue of manufacture of cement kiln, position with suitable temperature window of position that the cement decomposing furnace combustion chamber has suitable temperature window and cement decomposing furnace mixing flue, lay the atomizing lance of respective numbers and form.Thereby increased the degree of being mixed into of reducing agent and flue gas, prolonged the stop reaction time of reducing agent in stove, on the basis of original denitrating technique, improved denitration efficiency.Simultaneously, the variation that operating condition and kiln export, dore furnace exports amount of nitrogen oxides in the flue gas according to the on-line monitoring system feedback, can adopt the spray gun of diverse location selectively, to the furnace injection reducing agent, thereby under the prerequisite that guarantees denitration efficiency, control the consumption of reducing agent more accurately, reduce operating cost, in addition, can prolong the service life of spray gun.
At the high characteristics of cement dust content, pneumatic or electrodynamic type spray gun in use in the past, in the sleeve space that spray gun advances, volume causes the phenomenon of dust stratification, and the utility model has adopted novel spray gun accumulatingdust structure, namely overlaps the air bubble device in the disposed outside one of spray gun, intermittent sleeve gap to spray gun purges, prevent the generation of fouling phenomenon, guaranteed the normal operation of spraying system, stablized the operation of denitrating system.
Described dust stratification blow device is the air bubble that is applicable to new type nonaqueous cement production line SNCR technology.
The beneficial effects of the utility model are:
1, with respect to original SNCR technology, the utility model has improved denitration efficiency greatly;
2, with respect to the SCR technology, the utility model has reduced the escaping of ammonia rate, has also saved floor space simultaneously greatly, has shortened the construction period, has reduced cost of investment;
3, with respect to original SNCR technology, the utility model has improved denitrating system stability greatly, has reduced systematic running cost usefulness, has reduced operating cost;
4, the utility model is applicable to the tail flue gas denitration of cement kiln system, meets the environmental protection guiding of national relevant controlling cement kiln NOX discharging, and wide application space and huge market value are arranged.
Description of drawings
Fig. 1 is system construction drawing of the present utility model;
Fig. 2 is the spraying system structure chart;
Fig. 3 is the gun system structure chart;
Fig. 4 is dust stratification blow device structure chart.
Wherein, 1, urea dissolving tank; 2, ammoniacal liquor holding vessel; 3, dilution water pot; 4, reductant solution surge tank; 5, static mixer; 6, air compressor; 7, control module; 8, multilayer gun system; 9, combustion chamber; 10, the vertical flue between rotary kiln outlet and the dore furnace; 11, cement decomposing furnace mixing flue; 12, pneumatic propelling unit; 13, sleeve; 14, dust stratification blow device; 15, spray gun; 16, air atomizer, 17. sleeve gaps.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described.
A kind of SNCR denitrating system for dry cement production line, comprise combustion chamber 9, vertical flue 10 between rotary kiln outlet and the dore furnace, cement decomposing furnace mixing flue 11, combustion chamber 9, vertical flue 10 between rotary kiln outlet and the dore furnace, be respectively equipped with gun system on the cement decomposing furnace mixing flue 11, each gun system also becomes spraying system, spraying system links to each other with reducing agent supplied materials system, described reducing agent supplied materials system comprises static mixer 5 and the air compressor 6 that is connected with spraying system, static mixer 5 one tunnel connects dilution water pot 3 another roads and connects reductant solution surge tank 4, and reductant solution surge tank 4 is connected with urea dissolving tank 1 and ammoniacal liquor holding vessel 2 simultaneously.
Be furnished with multilayer gun system 8 respectively on vertical flue 10 between the outlet of combustion chamber 9, rotary kiln and the dore furnace, the cement decomposing furnace mixing flue 11.Described gun system comprises spray gun 15, and spray gun 15 is provided with pneumatic propelling unit 12 and sleeve 13, and pneumatic propelling unit 12 links to each other with air atomizer 16.Dust stratification blow device 14 is to be arranged in spray gun air outside big gun, is used for purging the dust stratification in spray gun sleeve space.
Described reducing agent supplied materials system is provided with the pipeline control system that the conversion reducing agent adds kind, and this control system is regulated by the control module 7 of whole technology, and control module is the DCS controller.
Cement kiln flue gas nitrogen oxide control technology: when being reducing agent with ammoniacal liquor, after the ammoniacal liquor of 20% mass concentration is transported to plant area by tank car, under the effect of ammoniacal liquor dispenser pump, enter ammoniacal liquor holding vessel 2 and store, be delivered to reductant solution surge tank 4 through the ammonia spirit supply pump again and store for future use.By for ammonia pump the ammoniacal liquor in the ammoniacal liquor holding vessel 2 being transported in the reductant solution surge tank 4.When carrying out the SNCR denitration, solution transfer pump is extracted the mass ammonia aqueous solution out from reductant solution surge tank 4, become certain density ammonia spirit (concentration can onlinely be regulated, and the concentration adjustment scope is 5%～20%) with the demineralized water mixed diluting in static mixer 5 from dilution water pot 3.Ammonia spirit after the dilution is transported to stokehold SNCR spray gun, ammonia spirit is under the pressure effect of delivery pump, during by spray gun, become droplet through mechanical atomization, the compressed air that is provided by air compressor 6 simultaneously enters spray gun, under bigger pressure and speed, further the atomizing of reducing agent drop is diminished, finally, ammonia spirit is sprayed into the combustion chamber 9 with suitable denitration temperature window, vertical flue 10 between rotary kiln outlet and the dore furnace, cement decomposing furnace mixing flue 11, the reducing agent drop is fully contacted with nitrogen oxide in the flue gas and redox reaction takes place, removing nitrogen oxide, thereby reach the denitration purpose.
When ammoniacal liquor transportation goes wrong or other factors are when making that the ammoniacal liquor supply can not be satisfied the denitrating system requirement, use urea reducing agent as an alternative instead.When being reducing agent with urea, the packed urea of finished product is transported to denitrating technique equipment room urea memory block by transport vehicle and stores.Packed urea is delivered to the dissolving tank platform by cucurbit, adopts the manual type unpacking and pours urea dissolving tank 1 at platform.Dissolving water and urea accelerate the dissolving of urea in the dissolving in-tank mixing by agitator and steam-heated mode.By valve control confluent and urea supply amount, prepare certain density urea liquid.
Urea liquid after the dissolving is delivered to reductant solution surge tank 4 by the urea liquid supply pump and stores for future use.
When carrying out the SNCR denitration, solution transfer pump is extracted the certain density urea liquid of quality out from reductant solution surge tank 4, (concentration can onlinely be regulated with becoming certain density urea liquid from the demineralized water mixed diluting in static mixer 5 that dilutes water pot 3, the concentration adjustment scope is 5%～20%), the urea liquid after the dilution is transported to stokehold SNCR spray gun.Urea liquid is under the pressure effect of delivery pump, pass through spray gun, become droplet through mechanical atomization, the compressed air that is provided by air compressor 6 simultaneously enters spray gun 15, under bigger pressure and speed, further the atomizing of reducing agent drop is diminished, finally spray into vertical flue 10, cement decomposing furnace mixing flue 11 between combustion chamber 9 with suitable temperature window, rotary kiln outlet and the dore furnace, make the reducing agent drop fully contact the generation redox reaction with nitrogen oxide in the flue gas, remove nitrogen oxide, thereby reach the denitration purpose.
When carrying out the SNCR denitration, pneumatic or electrodynamic type spray gun in use in the past, in the sleeve space that spray gun advances, volume causes the phenomenon of dust stratification, make spray gun can't be normally advance accordingly or withdraw from according to the variation of production status, the utility model utility model adopts and sets up dust stratification blow device 14 in the outside of spray gun according to this situation, intermittence spray into air to spray gun sleeve space, purge.Avoided situation about can't normally move because of system that sleeve space dust stratification causes.
Claims (5)
1. SNCR denitrating system that is used for dry cement production line, comprise the combustion chamber, vertical flue between rotary kiln outlet and the dore furnace, cement decomposing furnace mixing flue, it is characterized in that, the combustion chamber, vertical flue between rotary kiln outlet and the dore furnace, be respectively equipped with gun system on the cement decomposing furnace mixing flue, each gun system also becomes spraying system, spraying system links to each other with reducing agent supplied materials system, described reducing agent supplied materials system comprises static mixer and the air compressor that is connected with spraying system, static mixer one tunnel connects another road of dilution water pot and connects the reductant solution surge tank, and the reductant solution surge tank is connected with urea dissolving tank and ammoniacal liquor holding vessel simultaneously.
2. a kind of SNCR denitrating system for dry cement production line according to claim 1 is characterized in that, is furnished with the multilayer gun system respectively on the vertical flue between the outlet of described combustion chamber, rotary kiln and the dore furnace, the cement decomposing furnace mixing flue.
3. a kind of SNCR denitrating system for dry cement production line according to claim 1 and 2 is characterized in that described gun system comprises spray gun, and spray gun is provided with pneumatic propelling unit and sleeve, and pneumatic propelling unit links to each other with air atomizer.
4. a kind of SNCR denitrating system for dry cement production line according to claim 3 is characterized in that described spray gun and sleeve gap location are provided with the dust stratification blow device.
5. a kind of SNCR denitrating system for dry cement production line according to claim 4 is characterized in that, described dust stratification blow device is to be arranged in spray gun air outside big gun, is used for purging the dust stratification in spray gun sleeve space.
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| CN 201320097985 CN203132366U (en) | 2013-03-04 | 2013-03-04 | Selective non-catalytic reduction (SNCR) denitration system for dry method cement production line |
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| CN 201320097985 CN203132366U (en) | 2013-03-04 | 2013-03-04 | Selective non-catalytic reduction (SNCR) denitration system for dry method cement production line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551016A (en) * | 2013-11-20 | 2014-02-05 | 天津中材工程研究中心有限公司 | Method for reburning denitration of cement kiln by using alternative fuel |
| CN107349770A (en) * | 2017-07-21 | 2017-11-17 | 高建华 | A kind of manufacture of cement denitrating system |
| CN109847552A (en) * | 2019-01-16 | 2019-06-07 | 安徽海螺水泥股份有限公司 | A kind of cement kiln flue gas denitrating system and its control method |
-
2013
- 2013-03-04 CN CN 201320097985 patent/CN203132366U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551016A (en) * | 2013-11-20 | 2014-02-05 | 天津中材工程研究中心有限公司 | Method for reburning denitration of cement kiln by using alternative fuel |
| CN103551016B (en) * | 2013-11-20 | 2015-12-30 | 天津中材工程研究中心有限公司 | The method of a kind of cement kiln alternative fuel combustion denitration again |
| CN107349770A (en) * | 2017-07-21 | 2017-11-17 | 高建华 | A kind of manufacture of cement denitrating system |
| CN109847552A (en) * | 2019-01-16 | 2019-06-07 | 安徽海螺水泥股份有限公司 | A kind of cement kiln flue gas denitrating system and its control method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20150304 |
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