CN103512373A - Energy-saving denitration device and method of cement dry-process kiln - Google Patents
Energy-saving denitration device and method of cement dry-process kiln Download PDFInfo
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- CN103512373A CN103512373A CN201210212862.1A CN201210212862A CN103512373A CN 103512373 A CN103512373 A CN 103512373A CN 201210212862 A CN201210212862 A CN 201210212862A CN 103512373 A CN103512373 A CN 103512373A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Abstract
The invention discloses an energy-saving denitration device and method of a cement dry-process kiln. The device comprises a decomposing furnace, a cement kiln, an oxygen-enriched combustion-supporting coal-injection duct, a conveying pipeline, an oxygen-enriched preparation device, a coal dust preparation device and a reducing agent sprayer. A reducing agent storage device is connected with the reducing agent sprayer through a pipeline and stretches to the interior of the decomposing furnace. The decomposing furnace is connected with the cement kiln. The coal dust preparation device is connected with the cement kiln and the decomposing furnace through the conveying pipeline and the oxygen-enriched combustion-supporting coal-injection duct respectively. The oxygen-enriched preparation device is also connected with the cement kiln and the decomposing furnace through the conveying pipeline and the oxygen-enriched combustion-supporting coal-injection duct respectively. The method includes the steps that firstly, denitration is carried out through SNCR to reduce emission of nitric oxide in the cement kiln; secondly, oxygen-enriched combustion is carried out through OEC to purify oxygen in the air and achieve the oxygen content of 25-30% in the air, and then the air is conveyed to the interior of the cement kiln and the interior of the decomposing furnace to assist combustion; thirdly, an oxygen-enriched combustion and SNCR denitration DCS is set, reducing agent concentration and oxygen enrichment combustion concentration are controlled and adjusted through nitrogen oxide emission concentration, so that civilized production is achieved.
Description
Technical field
The present invention relates to a kind of energy-saving denitration apparatus and method of Cement Dry Process Kiln Product, belong to building material industry energy-conserving and emission-cutting technology field.
Background technology
The concentration of the New Style of Dry Cement Kiln discharged nitrous oxides of operation is greatly about 800～1600mg/Nm now
3between, the discharged nitrous oxides standard that carry out in the built cement plant producing is (GB4915-2004) 800mg/Nm
3, and following cement industry discharged nitrous oxides standard-required will be brought up to 500mg/Nm
3below.To the built cement plant producing, due to the restriction of place steric requirements, cannot use SCR technology (SCR) technique to reduce the nitrogen oxide in flue gas.Available SNCR (SNCR) denitration method reduces the discharge of cement kiln nitrogen oxide, cuts down effect 60%.Even if like this, be still difficult to steady and continuous, make discharged nitrous oxides concentration reach the discharging standards requirement that is about to revision.
Summary of the invention
The object of this invention is to provide a kind of production cost that do not increase, can reduce treating apparatus and the method for discharge of nitrogen oxide in cement kiln concentration.
For addressing the above problem, the present invention adopts following technical scheme: the energy-saving denitration device of Cement Dry Process Kiln Product, comprises that dore furnace 1, cement kiln 2, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, oxygen enrichment conveyance conduit 4, power transportation pipe 5, oxygen enrichment preparation facilities 7, fuel pulverizing plant 8, reducing agent shower nozzle 9 and reducing agent storage device 10 form; Described reducing agent storage device 10 connects reducing agent shower nozzle 9 by pipeline and stretches in dore furnace 1, the lower end of described dore furnace 1 is connected with the kiln tail of cement kiln 2, and described oxygen enrichment preparation facilities 7 is connected with the kiln tail oxygen-enriched combustion-supporting coal injection pipe 6 that is arranged on dore furnace 1 with the kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 that is arranged on cement kiln 2 kiln hoods with power transportation pipe 5 by oxygen enrichment conveyance conduit 4 respectively with fuel pulverizing plant 8.
The present invention also comprises the method for the energy-saving denitration device of Cement Dry Process Kiln Product, and it comprises the following steps:
Step 1: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide.At 850～1050 ℃ of positions of dore furnace, spray into concentration and be 20～25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen G&W;
Step 2: with oxygen-enriched combustion technology; The oxygen-enriched air that oxygen concentration is high burns, be called oxygen-enriched combusting (oxygen enriched combustion), be called for short OEC, airborne oxygen content is purified to 25～30% from 21%, the kiln hood and the kiln tail dore furnace that are applied to cement kiln are combustion-supporting, can make like this furnace flame temperature raise 200～300 ℃, reach nitrogen amount and reduce, the discharge capacity after burning also reduces and energy-conservation object.
Step 3: set up oxygen-enriched combusting and SNCR denitration DCS central control system; By discharged nitrous oxides concentration control and regulation reductant concentration and oxygen-enriched combustion-supporting concentration, control production and the emission behaviour of cement kiln, reach and carry out production strictly in line with rules and regulations.In fact, use apparatus and method of the present invention, only need the cost of original technology can reduce discharge of nitrogen oxide in cement kiln concentration, reduce disposal of pollutants.
One of object of the present invention, the especially wherein object of method: the discharge that adopts SNCR (SNCR) denitration method can cut down greatly nitrogen oxide, cut down effect and reach 60%, reduce disposal of pollutants;
Two of object of the present invention is can make furnace flame temperature raise 200～300 ℃ with oxygen-enriched combustion technology, reaches energy-conservation object; The more important thing is that use normal air is combustion-supporting, approximately 4/5ths nitrogen does not only participate in burning, and takes away a large amount of heat energy, and with oxygen-enriched combustion-supporting, nitrogen amount will reduce, and the capacity after burning also reduces, and heat loss reduces.General every increase by 1% exhaust gas volumn of oxygen concentration approximately declines 2～4.5%, thereby improves efficiency of combustion, increases heat utilization ratio.Normal air is combustion-supporting, and when heating-up temperature is 1300 ℃, its available heat is 42%; And during with 26% oxygenized air combustion supporting, available energy is 56%, energy-conservation 10%, discharged nitrous oxides reduces 20%;
The present invention also has advantages of following: one, SNCR denitration method site location can be arranged, space, ground, SCR denitration execution ground cannot be arranged;
Two, reduced investment, SNCR denitration method is 1/4 of SCR denitration method;
Three, OEC oxygen-enriched combusting and SNCR denitration DCS system, by discharged nitrous oxides concentration control and regulation reducing agent and oxygen-enriched combustion-supporting concentration;
Four, OEC oxygen-enriched combusting energy-saving and emission-reduction, institute's joint expense is offset the expense of SNCR denitration, does not increase production cost.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram of the present invention;
Symbol description in figure: dore furnace 1, cement kiln 2, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, oxygen enrichment conveyance conduit 4, power transportation pipe 5, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, oxygen enrichment preparation facilities 7, fuel pulverizing plant 8, reducing agent shower nozzle 9, reducing agent storage device 10.
The specific embodiment
With best embodiment, the present invention is described in detail below.
With reference to Fig. 1 in this enforcement, the energy-saving denitration device of Cement Dry Process Kiln Product, comprises that dore furnace 1, cement kiln 2, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, oxygen enrichment conveyance conduit 4, power transportation pipe 5, oxygen enrichment preparation facilities 7, fuel pulverizing plant 8, reducing agent shower nozzle 9 and reducing agent storage device 10 form; Described reducing agent storage device 10 connects reducing agent shower nozzle 9 by pipeline and stretches in dore furnace 1, the lower end of described dore furnace 1 is connected with the kiln tail of cement kiln 2, and described oxygen enrichment preparation facilities 7 is connected with the kiln tail oxygen-enriched combustion-supporting coal injection pipe 6 that is arranged on dore furnace 1 with the kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 that is arranged on cement kiln 2 kiln hoods with power transportation pipe 5 by oxygen enrichment conveyance conduit 4 respectively with fuel pulverizing plant 8.
The method of the energy-saving denitration of Cement Dry Process Kiln Product, it comprises the steps:
Described step 1: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide.At 850～1050 ℃ of positions of dore furnace, spray into concentration and be 20～25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen G&W;
4NO+4NH
3+O
2——4N
2+6H
2O
2NO
2+4NH
3+O
2——3N
2+6H
2O
In the process of specific implementation: be 26% oxygen-enriched combustion-supporting by concentration, when calciner temperature is 850～1050 ℃, pressing NH for ammonia vol
3/ NO=1.1, discharge pressure is 3kg/cm
3situation under, recording different reductant concentrations has different discharged nitrous oxides concentration.(seeing the following form), along with the increase of ammonia spirit concentration, discharged nitrous oxides concentration reduces gradually, but cost is also increasing.
| Example | Ammonia spirit concentration (%) | Discharged nitrous oxides concentration (mg/Nm 3) |
| 1 | 20 | 256 |
| 2 | 21 | 244 |
| 3 | 22 | 235 |
| 4 | 23 | 229 |
| 5 | 24 | 225 |
| 6 | 25 | 223 |
This step is completed by reducing agent storage device 10 and reducing agent shower nozzle 9.According to the nitrous oxides concentration of kiln tail discharge, reducing agent storage device 10 regulates the concentration of reducing agent in setting range, in reducing agent shower nozzle 9 sprays into cement kiln dore furnace 1.
Described step 2: with oxygen-enriched combustion technology; Airborne oxygen content is purified to 25～30%, and the kiln hood and the kiln tail dore furnace that are transported to cement kiln are combustion-supporting, can make like this furnace flame temperature raise 200～300 ℃, reach nitrogen amount and reduce, and the discharge capacity after burning also reduces and energy-conservation object.
In the process of specific implementation: in the situation that not opening SNCR denitrification apparatus, record different oxygen-enriched combustion-supporting concentration and discharged nitrous oxides and energy-conservation situation.(seeing the following form) extraction Tomita oxygen concentration is higher, and discharged nitrous oxides is fewer, and energy-saving effect is better, but expense is also larger.
| Example | Oxygen-rich concentration (%) | Containing nitrogen concentration (%) | Discharged nitrous oxides reduces (%) | Energy-conservation (%) |
| 1 | 21 | 79 | 0 | 0 |
| 2 | 23 | 77 | 8 | 5 |
| 3 | 25 | 75 | 16 | 8 |
| 4 | 26 | 74 | 20 | 10 |
| 5 | 27 | 73 | 24 | 15 |
| 6 | 28 | 72 | 28 | 20 |
| 7 | 29 | 71 | 32 | 25 |
| 8 | 30 | 70 | 36 | 30 |
This step is completed jointly by oxygen enrichment preparation facilities 7, fuel pulverizing plant 8, oxygen enrichment conveyance conduit 4, power transportation pipe 5, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6.Oxygen enrichment preparation facilities 7 is according to the nitrous oxides concentration of kiln tail discharge, in setting range, regulate the concentration of preparing oxygen enrichment, through oxygen enrichment conveyance conduit 4, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, to send into cement kiln 2 (kiln hood) and dore furnace 1 (kiln tail) respectively combustion-supporting; Meanwhile, coal dust, also through fuel pulverizing plant 8, power transportation pipe 5, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 and kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, is sent into respectively burning in cement kiln 2 (kiln hood) and dore furnace 1 (kiln tail).
Described step 3: set up oxygen-enriched combusting and SNCR denitration DCS central control system; With the nitrous oxides concentration of kiln tail discharge, control to adjust reductant concentration and oxygen-enriched combustion-supporting concentration, control production and the emission behaviour of cement kiln comprehensively, reach and carry out production strictly in line with rules and regulations.
Through practice, recording, cement kiln, when setting the oxygen-enriched combustion-supporting that concentration is 26%, sprays under the reduction that concentration is 22% ammonia spirit dore furnace, and kiln tail discharged nitrous oxides concentration is 235mg/Nm
3, now, discharged nitrous oxides reduces 80%, energy-conservation 10%, and economic performance is best.
Finally it should be noted that: obviously, above-described embodiment is only for example of the present invention is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being amplified out thus or change are still among protection scope of the present invention.
Claims (2)
1. the energy-saving denitration device of Cement Dry Process Kiln Product, comprises that dore furnace 1, cement kiln 2, kiln hood oxygen-enriched combustion-supporting coal injection pipe 3, kiln tail oxygen-enriched combustion-supporting coal injection pipe 6, oxygen enrichment conveyance conduit 4, power transportation pipe 5, oxygen enrichment preparation facilities 7, fuel pulverizing plant 8, reducing agent shower nozzle 9 and reducing agent storage device 10 form; Described reducing agent storage device 10 connects reducing agent shower nozzle 9 by pipeline and stretches in dore furnace 1, the lower end of described dore furnace 1 is connected with the kiln tail of cement kiln 2, and described oxygen enrichment preparation facilities 7 is connected with the kiln tail oxygen-enriched combustion-supporting coal injection pipe 6 that is arranged on dore furnace 1 with the kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 that is arranged on cement kiln 2 kiln hoods with power transportation pipe 5 by oxygen enrichment conveyance conduit 4 respectively with fuel pulverizing plant 8.
2. the method for the energy-saving denitration device of Cement Dry Process Kiln Product, is characterized in that, comprises the following steps:
Described step 1: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide.At 850～1050 ℃ of positions of dore furnace, spray into concentration and be 20～25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen G&W;
Described step 2: with oxygen-enriched combustion technology; The oxygen-enriched air that oxygen concentration is high burns, be called oxygen-enriched combusting (oxygen enriched combustion), be called for short OEC, airborne oxygen content is purified to 25～30% from 21%, the kiln hood and the kiln tail dore furnace that are applied to cement kiln are combustion-supporting, can make like this furnace flame temperature raise 200～300 ℃, reach nitrogen amount and reduce, the discharge capacity after burning also reduces and energy-conservation object;
Described step 3: set up oxygen-enriched combusting and SNCR denitration DCS central control system; By discharged nitrous oxides concentration control and regulation reductant concentration and oxygen-enriched combustion-supporting concentration, control production and the emission behaviour of cement kiln, reach and carry out production strictly in line with rules and regulations.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607031A (en) * | 2015-02-12 | 2015-05-13 | 巨石集团有限公司 | Waste gas denitration treatment method and device thereof |
| CN104998531A (en) * | 2015-06-24 | 2015-10-28 | 江苏羚羊水泥工程技术有限公司 | SNCR denitration system for cement kiln flue gas |
| CN112629273A (en) * | 2020-12-22 | 2021-04-09 | 无锡市阳泰环境科技有限公司 | Standard discharge method of nitrogen oxide in combustion |
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Cited By (4)
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| CN104607031A (en) * | 2015-02-12 | 2015-05-13 | 巨石集团有限公司 | Waste gas denitration treatment method and device thereof |
| CN104998531A (en) * | 2015-06-24 | 2015-10-28 | 江苏羚羊水泥工程技术有限公司 | SNCR denitration system for cement kiln flue gas |
| CN104998531B (en) * | 2015-06-24 | 2017-06-20 | 江苏羚羊水泥工程技术有限公司 | A kind of cement kiln flue gas SNCR denitration system |
| CN112629273A (en) * | 2020-12-22 | 2021-04-09 | 无锡市阳泰环境科技有限公司 | Standard discharge method of nitrogen oxide in combustion |
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