CN209276392U - A kind of no ammonia denitration cement clinker burning system - Google Patents

A kind of no ammonia denitration cement clinker burning system Download PDF

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Publication number
CN209276392U
CN209276392U CN201821841147.3U CN201821841147U CN209276392U CN 209276392 U CN209276392 U CN 209276392U CN 201821841147 U CN201821841147 U CN 201821841147U CN 209276392 U CN209276392 U CN 209276392U
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China
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dore furnace
tapering
gas
cylinder
kiln tail
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朱永长
吴建军
沈军
印志松
孙德群
赵小亮
黄锋
刘志国
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CBMI SINOMA INTERNATIONAL ENGINEERING Co Ltd
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CBMI SINOMA INTERNATIONAL ENGINEERING Co Ltd
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Abstract

The utility model discloses a kind of no ammonia denitration cement clinker burning systems, including cyclone preheater, dore furnace, tertiary air air hose, kiln tail coal burner, rotary kiln, smoke-box, blue-gas generator etc.;Wherein tertiary air air hose is connected with dore furnace cylinder, separates from the feeder pipe of the second level cyclone cylinder from bottom to top in cyclone preheater and enters dore furnace tapering all the way, and other roads enter dore furnace cylinder, and discharging point is above tertiary air air hose;Kiln tail coal burner is arranged in the lower part in dore furnace tapering, and the water-gas that blue-gas generator generates enters dore furnace from the top in dore furnace tapering and dore furnace cylinder.Using Tthe utility model system, reducing zone can be constituted between the kiln tail coal burner and tertiary air air hose in dore furnace tapering, generate a large amount of reducibility gas, the water-gas of blue-gas generator generation can also be introduced simultaneously, reduction reaction occurs with the NOx in furnace, the discharge of NOx can also be effectively reduced in the case where not having to ammonium hydroxide, reach national environmental protection emission request.

Description

A kind of no ammonia denitration cement clinker burning system
Technical field
The utility model relates to a kind of cement clinker burning systems for realizing no ammonia denitrating technique, belong to technology of producing cement Field.
Background technique
Currently, the nearly all mating SNCR equipment for denitrifying flue gas of cement production enterprise, NOx emission concentration are limited in 400mg/Nm3With Under, key area NOx emission limit value is 320mg/Nm3, but the operating cost of enterprise is higher.
Attention with society to environment also becomes increasingly tighter for the atmosphere pollutants emission standards of cement industry The NOx emission concentration of cement production enterprise is limited in 150mg/Nm by lattice, drug in some provinces3Hereinafter, some is even limited in 100mg/Nm3Below.Existing SNCR denitration system denitration efficiency is only 60%~70%, in so severe environmental requirement Under, which is difficult to meet new discharge standard, and Some Enterprises is promoted to attempt denitration technology transformation.
The mainstream scheme of denitration technological transformation at present is: point of two layers arrangement of kiln tail coal dust, that is, it is constant to retain original kiln tail coal dust pipeline, Coal dust all the way is drawn from former kiln tail coal pipe road and enters dore furnace tapering, and the pulverized coal consumption in dore furnace tapering accounts for whole kiln tail coal The 30%~60% of powder dosage, denitration efficiency reaches 10%~30%, it is still desirable to which the auxiliary of SNCR just can control the row of NOx It puts.The main bottleneck of the modification scheme is not able to satisfy and generates enough reduction first is that the reducing zone in kiln tail dore furnace tapering is smaller Property gas and reduction NOx needed for the time when such as using anthracite, enough reproducibilities cannot be generated second is that by effect on coal quality Atmosphere, third is that easily leading to smoke-box if excessive coal dust generates high temperature in the zonal combustion and dore furnace tapering generating skinning, make At the unstable of firing system, denitration efficiency is limited.
Utility model content
Goal of the invention: in view of the problems of the existing technology, the purpose of the utility model is to provide a kind of no ammonia denitration water Mud sinter leaching system, it is big with denitration reducing zone space, not skinning, without ammonium hydroxide, that denitration efficiency is high, operating cost is low is excellent Point.
Technical solution: the utility model is achieved using following technical scheme:
A kind of no ammonia denitration cement clinker burning system, including cyclone preheater, dore furnace, tertiary air air hose, kiln tail coal Powder burner, coal dust regulating valve, rotary kiln and smoke-box;The dore furnace includes dore furnace cylinder and dore furnace tapering, dore furnace Tapering is connected by the smoke-box with the rotary kiln;The tertiary air air hose is connected with dore furnace cylinder, from the rotation The feeder pipe of second level cyclone cylinder from bottom to top in wind preheater separates enters dore furnace tapering all the way, and other roads, which enter, to be divided Furnace stay body is solved, discharging point is above tertiary air air hose;The kiln tail coal burner is arranged in the lower part in dore furnace tapering;It is described System further includes blue-gas generator, and the water-gas that the blue-gas generator generates divides two-way to enter dore furnace, all the way with point The connection of furnace tapering is solved, another way is connect with dore furnace cylinder top, and water-gas regulating valve is respectively equipped on two path water gaspipe line.
Preferably, the kiln tail coal burner is only placed at the lower part in dore furnace tapering, and only one layer of kiln tail coal Powder burner.
Preferably, the kiln tail coal burner is uniformly distributed on the level cross-sectionn of dore furnace tapering, and quantity is even number.
Preferably, manually or electrically coal dust regulating valve is arranged before the kiln tail coal burner.
Preferably, the feeder pipe sub-material of the second level cyclone cylinder from bottom to top of the cyclone preheater is bored to dore furnace The doses in portion accounts for the 30%~60% of the feeder pipe total stuff amount.
Preferably, the water-gas that the blue-gas generator generates is in the water for entering dore furnace cylinder and dore furnace tapering It is multi-point equispaced on flat cross section.
The utility model has the advantages that compared with prior art, the utility model has following advantage:
(1) traditional tertiary air air hose is arranged in the top in dore furnace tapering, and kiln tail coal burner is arranged in dore furnace cone The top in portion, almost without reducing zone, the tertiary air air hose of the utility model is arranged in dore furnace cylinder, kiln tail coal burner cloth The lower part in dore furnace tapering is set, forms biggish reducing zone between kiln tail coal burner and tertiary air air hose, it generates big Measure reducibility gas (such as CO, H2Deng), there are grace time and NOx that reduction reaction occurs, denitration efficiency is higher.
(2) kiln tail coal dust 100% enters the lower part in dore furnace tapering, and under conditions of oxygen content is less, coal dust is incomplete Burning generates a large amount of reducibility gas, is used for denitration reaction, meanwhile, coal dust imperfect combustion also produces amount of heat, rotation Point material cold all the way can absorb rapidly the heat of reducing zone coal dust imperfect combustion generation to the tapering of dore furnace in wind preheater Amount effectively controls the temperature of smoke-box and dore furnace tapering, does not generate skinning, firing system stable operation.
(3) when operating condition or coal quality change, and cause NOx higher, then start blue-gas generator, generate certain Reducibility gas (such as CO, H of amount2Deng), the less dore furnace tapering of oxygen content and dore furnace top cylinder are entered, with NOx Reduction reaction occurs, further decreases the discharge of NOx.
(4) the utility model does not need the auxiliary of SNCR denitration system, can control the qualified discharge of NOx, i.e. denitration yet Journey is without ammonium hydroxide, the moisture evaporation endothermic more brought into without ammonium hydroxide, reduces heat consumption from the root, saves operating cost.
(5) denitration efficiency is high, can control NOx emission in 100mg/Nm3Within, not only meet the existing discharge standard of country, Place and the severeer discharge standard of industry can also be met.
Detailed description of the invention
Fig. 1 is a kind of cement clinker burning system structural schematic diagram provided by the embodiment of the utility model;
In figure: 1 cyclone preheater, 2 dore furnaces, 3 tertiary air air hoses, 4 dore furnace taperings, 5 kiln tail coal burners, 6 coals Powder regulating valve, 7 rotary kilns, 8 smoke-boxes, 9 water-gas regulating valves, 10 blue-gas generators.
Specific embodiment
The utility model is further elaborated now in conjunction with attached drawing 1 and specific embodiment.
As shown in Figure 1, a kind of cement clinker burning system disclosed in the utility model embodiment, including cyclone preheater 1, Dore furnace 2, tertiary air air hose 3, dore furnace tapering 4, kiln tail coal burner 5, coal dust regulating valve 6, rotary kiln 7, smoke-box 8, water Gas regulator 9 and blue-gas generator 10.
Rotary kiln 7 is connected by smoke-box 8 with dore furnace tapering 4, and dore furnace tapering 4 is connected with dore furnace 2, cyclone preheater C4 (the present embodiment is C3 for level Four preheater by taking Pyatyi preheater as an example, is C5 for six grades of preheaters) blanking in 1 Tri- tunnel Guan Fen enters dore furnace 2, first via discharging point in dore furnace tapering 4, the second road discharging point above tertiary air air hose 3, Third road discharging point is connected in the top of the second road discharging point, tertiary air air hose 3 with 2 cylinder of dore furnace, two or four kiln Tail coal powder burner 5 is evenly arranged on the lower part in dore furnace tapering 4, the water-gas that blue-gas generator 10 generates on level cross-sectionn Enter dore furnace from the top of 2 cylinder of dore furnace tapering 4 and dore furnace, it is multi-point equispaced on level cross-sectionn.Water-gas pipeline On be respectively equipped with water-gas regulating valve 9, kiln tail chimney is equipped with NOx online monitoring instruments, can be according to the NOx feedback letter of on-line monitoring Number adjust water-gas regulating valve 9, when NOx feedback be greater than defined emission limit (such as 150mg/Nm3), then start water automatically Gas regulator 9 adjusts the water-gas amount for entering dore furnace by blue-gas generator 10, and the NOx in water-gas and dore furnace is sent out Raw denitration reaction, to reach the emission limit of control NOx.
Using utility model embodiment cement clinker burning system without ammonia denitrating technique method are as follows: kiln tail coal dust 100% enters the lower part in dore furnace tapering, and under conditions of oxygen content 0.5%~3%, coal dust imperfect combustion generates a large amount of Reducibility gas is used for denitration reaction, meanwhile, coal dust imperfect combustion also produces amount of heat, and C4 feeder pipe point arrives all the way The tapering of dore furnace, sub-material amount account for the 30%~60% of C4 feeder pipe total stuff amount, and cold material can absorb rapidly reducing zone coal dust The heat that imperfect combustion generates effectively controls the temperature (1000~1150 DEG C) of smoke-box and dore furnace tapering, does not generate skinning, Firing system stable operation.When operating condition or coal quality change, and cause NOx higher, then start blue-gas generator, produces Raw a certain amount of water-gas (such as CO, H2Deng), the less dore furnace tapering of oxygen content and dore furnace top cylinder are entered, with Reduction reaction occurs for NOx, further decreases the discharge of NOx, reaches national environmental protection emission request.
Application examples
Before certain cement plant denitration transformation, kiln tail chimney NOx emission is controlled in 280mg/Nm3When, ammonium hydroxide average dose 1.0~ 1.2m3/h;After the utility model denitration technological transformation, kiln tail coal dust 100% enters the lower part in dore furnace tapering, smoke-box oxygen content 2.3%, the sub-material amount in dore furnace tapering accounts for the 40% of C4 feeder pipe total stuff amount, same to control kiln tail chimney NOx emission 280mg/ Nm3When, 0.2~0.3m of ammonium hydroxide average dose3/h;After enabling blue-gas generator, blue-gas generator feeds coal amount 1.15t/h, raw At water-gas 3700Nm3/ h, kiln tail chimney NOx emission 90mg/Nm3

Claims (6)

1. a kind of no ammonia denitration cement clinker burning system, including cyclone preheater, dore furnace, tertiary air air hose, kiln tail coal dust Burner, coal dust regulating valve, rotary kiln and smoke-box;The dore furnace includes dore furnace cylinder and dore furnace tapering, dore furnace cone Portion is connected by the smoke-box with the rotary kiln;It is characterized in that, the tertiary air air hose is connected with dore furnace cylinder, It is separated from the feeder pipe of the second level cyclone cylinder from bottom to top in the cyclone preheater and enters dore furnace tapering all the way, it is other Road enters dore furnace cylinder, and discharging point is above tertiary air air hose;The kiln tail coal burner is arranged in dore furnace tapering Lower part;The system also includes blue-gas generator, the water-gas that the blue-gas generator generates divides two-way to enter dore furnace, It is connect all the way with dore furnace tapering, another way is connect with dore furnace cylinder top, and water coal is respectively equipped on two path water gaspipe line Gas regulating valve.
2. a kind of no ammonia denitration cement clinker burning system according to claim 1, which is characterized in that the kiln tail coal dust Burner is only placed at the lower part in dore furnace tapering, and only one layer of kiln tail coal burner.
3. a kind of no ammonia denitration cement clinker burning system according to claim 2, which is characterized in that the kiln tail coal dust Burner is uniformly distributed on the level cross-sectionn of dore furnace tapering, and quantity is even number.
4. a kind of no ammonia denitration cement clinker burning system according to claim 1, which is characterized in that the kiln tail coal dust Manually or electrically coal dust regulating valve is set before burner.
5. a kind of no ammonia denitration cement clinker burning system according to claim 1, which is characterized in that the whirlwind preheating The doses in feeder pipe sub-material to the dore furnace tapering of the second level cyclone cylinder from bottom to top of device accounts for the 30% of the feeder pipe total stuff amount ~60%.
6. a kind of no ammonia denitration cement clinker burning system according to claim 1, which is characterized in that the water-gas hair The water-gas that raw furnace generates is multi-point equispaced on the level cross-sectionn for entering dore furnace cylinder and dore furnace tapering.
CN201821841147.3U 2018-11-08 2018-11-08 A kind of no ammonia denitration cement clinker burning system Active CN209276392U (en)

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Application Number Priority Date Filing Date Title
CN201821841147.3U CN209276392U (en) 2018-11-08 2018-11-08 A kind of no ammonia denitration cement clinker burning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821841147.3U CN209276392U (en) 2018-11-08 2018-11-08 A kind of no ammonia denitration cement clinker burning system

Publications (1)

Publication Number Publication Date
CN209276392U true CN209276392U (en) 2019-08-20

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