CN103512373B - 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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- CN103512373B CN103512373B CN201210212862.1A CN201210212862A CN103512373B CN 103512373 B CN103512373 B CN 103512373B CN 201210212862 A CN201210212862 A CN 201210212862A CN 103512373 B CN103512373 B CN 103512373B
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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
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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 present operation is greatly about 800 ~ 1600mg/Nm
3between, the discharged nitrous oxides standard that the built cement plant producing performs is (GB4915-2004) 800mg/Nm
3, and following cement industry discharged nitrous oxides standard-required will bring up to 500mg/Nm
3below.To the built cement plant produced, due to the restriction of place steric requirements, SCR technology (SCR) technique cannot be used 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, make discharged nitrous oxides concentration reach the discharging standards requirement being about to revision with being still difficult to steady and continuous.
Summary of the invention
The object of this invention is to provide one and do not increase production cost, treating apparatus and the method for discharge of nitrogen oxide in cement kiln concentration can be reduced.
For solving the problem, the present invention adopts following technical scheme: the energy-saving denitration device of Cement Dry Process Kiln Product, comprises 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 and forms; 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 being arranged on dore furnace 1 with the kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 being arranged on cement kiln 2 kiln hood with power transportation pipe 5 respectively by oxygen enrichment conveyance conduit 4 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 one: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide.Spray at dore furnace 850 ~ 1050 DEG C of positions concentration be 20 ~ 25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen and water;
Step 2: with oxygen-enriched combustion technology; Oxygen-enriched air high for oxygen concentration is burnt, be called oxygen-enriched combusting (oxygen enriched combustion), be called for short OEC, oxygen content in air 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, furnace flame temperature can be made like this to raise 200 ~ 300 DEG C, and 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, decreasing pollution discharges.
An object of the present invention, the especially wherein object of method: adopt SNCR (SNCR) denitration method can cut down the discharge of nitrogen oxide greatly, cut down effect and reach 60%, decreasing pollution discharges;
Two of object of the present invention furnace flame temperature can be made to raise 200 ~ 300 DEG C with oxygen-enriched combustion technology, reaches energy-conservation object; The more important thing is by normal air combustion-supporting, the nitrogen of about 4/5ths 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 oxygen concentration often increases by 1% exhaust gas volumn and about declines 2 ~ 4.5%, thus improves efficiency of combustion, increases heat utilization ratio.Normal air is combustion-supporting, and when heating-up temperature is 1300 DEG C, 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 following advantage: 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, save expense and offset the expense of SNCR denitration, do 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.
Detailed description of the invention
By 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 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 and forms; 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 being arranged on dore furnace 1 with the kiln hood oxygen-enriched combustion-supporting coal injection pipe 3 being arranged on cement kiln 2 kiln hood with power transportation pipe 5 respectively by oxygen enrichment conveyance conduit 4 with fuel pulverizing plant 8.
The method of the energy-saving denitration of Cement Dry Process Kiln Product, it comprises the steps:
Described step one: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide.Spray at dore furnace 850 ~ 1050 DEG C of positions concentration be 20 ~ 25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen and water;
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: being 26% oxygen-enriched combustion-supporting by concentration, when calciner temperature is 850 ~ 1050 DEG C, press NH for ammonia vol
3/ NO=1.1, discharge pressure is 3kg/cm
3when, 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 in increase.
| 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, sprays in cement kiln dore furnace 1 through reducing agent shower nozzle 9.
Described step 2: with oxygen-enriched combustion technology; Oxygen content in air is purified to 25 ~ 30%, and the kiln hood and the kiln tail dore furnace that are transported to cement kiln are combustion-supporting, and furnace flame temperature can be made like this to raise 200 ~ 300 DEG C, and reach nitrogen amount and reduce, the discharge capacity after burning also reduces and energy-conservation object.
In the process of specific implementation: when not opening SNCR denitration device, record different oxygen-enriched combustion-supporting concentration and discharged nitrous oxides and energy-conservation situation.It is higher that (seeing the following form) extracts Tomita oxygen concentration, 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.The nitrous oxides concentration that oxygen enrichment preparation facilities 7 discharges according to kiln tail, in setting range, regulate the concentration 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, respectively send into cement kiln 2 (kiln hood) Sum decomposition stove 1 (kiln tail) 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, sends into burning in cement kiln 2 (kiln hood) Sum decomposition stove 1 (kiln tail) respectively.
Described step 3: set up oxygen-enriched combusting and SNCR denitration DCS central control system; Control to adjust reductant concentration and oxygen-enriched combustion-supporting concentration with the nitrous oxides concentration of kiln tail discharge, control production and the emission behaviour of cement kiln comprehensively, reach and carry out production strictly in line with rules and regulations.
Record through practice, cement kiln is when to set concentration be the oxygen-enriched combustion-supporting of 26%, and spray under concentration is the reduction of the ammonia spirit of 22% to dore furnace, kiln tail discharged nitrous oxides concentration is 235mg/Nm
3, now, discharged nitrous oxides reduces 80%, energy-conservation 10%, and economic performance is best.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not 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 the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (1)
1. the energy-saving denitration method of Cement Dry Process Kiln Product, is characterized in that comprising the following steps:
Step one: by SNCR (SNCR) denitration method, reduce the discharge of cement kiln nitrogen oxide; Spray at dore furnace 850 ~ 1050 DEG C of positions concentration be 20 ~ 25% ammoniacal liquor or urea liquid as reducing agent, its nitrogen oxide in flue gas is combined, and is reduced into nitrogen and water; Its device comprises dore furnace (1), reducing agent shower nozzle (9) and reducing agent storage device (10) and forms; Reducing agent storage device (10) connects reducing agent shower nozzle (9) by pipeline and stretches in dore furnace (1);
Step 2: with oxygen-enriched combustion technology, oxygen-enriched air high for oxygen concentration is burnt, be called oxygen-enriched combusting (oxygen enriched combustion), be called for short OEC, oxygen content in air is purified to 21 ~ 30% from 21%, and the kiln hood and the kiln tail dore furnace that are applied to cement kiln are combustion-supporting, and furnace flame temperature can be made like this to raise 200 ~ 300 DEG C, reach nitrogen amount to reduce, the discharge capacity after burning also reduces and energy-conservation object; Its device comprises 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) formation; The lower end of dore furnace (1) is connected with the kiln tail of cement kiln (2), and oxygen enrichment preparation facilities (7) and fuel pulverizing plant (8) are connected respectively by oxygen enrichment conveyance conduit (4) and power transportation pipe (5) and the kiln hood oxygen-enriched combustion-supporting coal injection pipe (3) being arranged on cement kiln (2) kiln hood and kiln tail oxygen-enriched combustion-supporting coal injection pipe (6) that is arranged on dore furnace (1);
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 clean and carry out production strictly in line with rules and regulations.
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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 |
| 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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