CN209848644U - Denitration system for cement kiln flue gas - Google Patents
Denitration system for cement kiln flue gas Download PDFInfo
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- CN209848644U CN209848644U CN201920071233.9U CN201920071233U CN209848644U CN 209848644 U CN209848644 U CN 209848644U CN 201920071233 U CN201920071233 U CN 201920071233U CN 209848644 U CN209848644 U CN 209848644U
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Abstract
The utility model discloses a cement kiln is deNOx systems for flue gas has: a kiln body; the decomposing furnace is connected with the kiln body; the five-stage cyclone system is connected with the kiln body and the decomposing furnace and comprises a first-stage cyclone, a second-stage cyclone, a third-stage cyclone, a fourth-stage cyclone and a fifth-stage cyclone; and the ammonia spraying gun is arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone cylinder, at the conical part of the five-stage cyclone cylinder, at the outlet of the straight cylinder part and the five-stage cyclone cylinder, so that the NOx emission concentration of a cement factory is further reduced, the using amount of denitration ammonia water is reduced, and the corrosion of system ammonia escape to equipment and secondary pollution to atmosphere are reduced.
Description
Technical Field
The utility model belongs to the technical field of the cement clinker production line, especially, relate to a cement kiln is deNOx systems for flue gas.
Background
At present, two main types of tail end treatment technologies for flue gas denitration in cement plants are available, wherein one of the two main types is as follows: the traditional SNCR denitration technology (selective non-catalytic reduction technology); the second step is as follows: SCR denitration technology (selective catalytic reduction technology).
In realizing the utility model discloses an in-process, utility model human finds that prior art has following problem at least:
the traditional SNCR denitration technology adopts ammonia water as a reducing agent, has NO catalyst, and needs to react with NO at about 850 DEG CXAnd (4) reacting to realize denitration. But the reaction efficiency is low, the denitration efficiency is only about 60%, the consumption of the reducing agent ammonia water is high, the escape concentration of the ammonia in the discharged tail gas is high, and secondary pollution exists.
SCR denitration technology, in which ammonia water is used as a reducing agent under the action of a special catalyst to realize flue gas denitration, wherein the reaction temperature is about 300-400 ℃. Due to the action of the catalyst, the reaction efficiency is improved, the denitration efficiency can reach 90%, and the catalyst is widely applied to industries such as electric power and the like at present. However, in the cement industry, the catalyst is easily poisoned due to the influence of clinker line dust, SO2 emission and the like, SO that the catalyst is ineffective, solid wastes are generated, and a plurality of technical problems still exist in the application of the SCR technology.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a further reduce cement mill NOx emission concentration, reduce denitration aqueous ammonia quantity, reduce system ammonia escape to the corruption of equipment and to atmospheric secondary pollution denitration system for cement kiln flue gas is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a denitration system for cement kiln flue gas has:
a kiln body;
the decomposing furnace is connected with the kiln body;
the five-stage cyclone system is connected with the kiln body and the decomposing furnace and comprises a primary cyclone, a secondary cyclone, a tertiary cyclone, a four-stage cyclone and a five-stage cyclone;
the ammonia spraying gun is arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part of the five-stage cyclone, at the outlet of the straight cylinder and at the outlet of the five-stage cyclone.
The ammonia spraying gun is movably arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part of the five-stage cyclone, at the outlet of the straight cylinder and at the outlet of the five-stage cyclone; the insertion angle and the depth of the ammonia spraying gun can be adjusted.
The five-stage cyclone cylinder comprises a straight cylinder part at the upper part and a cone part at the lower part.
According to the control method of the denitration system for the cement kiln flue gas, the ammonia spraying amount of each point is controlled through the flow dividing valve group by setting a target value according to different nitrogen oxide contents in the flue gas at different waste gas points at the tail of a cement clinker line, and the matched compressed air pressure is respectively set according to different ammonia spraying amounts of each point and different insertion depths of ammonia lances.
One of the technical scheme has the following advantages or beneficial effects, the NOx emission concentration of a cement plant is further reduced, the dosage of denitration ammonia water is reduced, and the corrosion of system ammonia escape to equipment and secondary pollution to atmosphere are reduced.
Drawings
Fig. 1 is a schematic structural view of a denitration system for cement kiln flue gas provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a five-stage cyclone of the denitration system for cement kiln flue gas of FIG. 1;
the labels in the above figures are: 1. the device comprises a kiln body, 2, a decomposing furnace, 3, a five-stage cyclone, 4, a four-stage cyclone, 5 and an ammonia spraying gun.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1-2, a denitration system for cement kiln flue gas has:
a kiln body;
the decomposing furnace is connected with the kiln body;
the five-stage cyclone system is connected with the kiln body and the decomposing furnace and comprises a first-stage cyclone, a second-stage cyclone, a third-stage cyclone, a fourth-stage cyclone and a fifth-stage cyclone;
the ammonia spraying gun is arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part of the five-stage cyclone, at the outlet of the straight cylinder and at the outlet of the five-stage cyclone. The proper reaction temperature field is selected through point selection, the insertion angle and the insertion depth of the spray gun are adjusted, the atomization mixing effect is enhanced, the contact time is prolonged, and the reaction efficiency is improved.
The ammonia spraying gun is movably arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part of the five-stage cyclone, at the outlet of the straight cylinder and at the outlet of the five-stage cyclone; the insertion angle and depth of the ammonia spraying gun can be adjusted.
The five-stage cyclone cylinder comprises a straight cylinder part at the upper part and a cone part at the lower part.
Through two aspects of ammonia volume and rational arrangement system ammonia injection point are spouted to accurate stable control each point, realize high-efficient accurate denitration function, turn into clean pollution-free nitrogen gas and water with the nitrogen oxide that produces in the cement clinker production process, whole in-process no waste water and waste liquid discharge, and guarantee that ammonia escape volume is less than safe environmental protection limiting value, realize the ultralow emission requirement of cement mill flue gas nitrogen oxide through rational control, reduce the pollution of nitrogen oxide to the environment, help further promoting the clean production level of cement trade.
The utility model provides a control method of foretell cement kiln is denitration system for flue gas, it is different according to the different waste gas point flue gas of cement clinker line kiln tail nitrogen oxide content, through setting for the target value, accurate control reposition of redundant personnel valves stabilizes the best ammonia volume of spouting of each point, and it is different according to the ammonia volume of spouting of each point, ammonia gun insertion depth is different, set up respectively and match best compressed air pressure, realize the best atomization effect of each point when guaranteeing the accurate reposition of redundant personnel of flow, improve aqueous ammonia reaction efficiency, reduce the aqueous ammonia volume of spouting and reduce system ammonia escape volume.
Actually put into use in a certain 5000t/d cement clinker production line when standard NO is in a stateXControl 100mg/m3When the amount of the ammonia water used for clinker per ton is about 3.2L/t (the amount of the ammonia water used for clinker per ton is about 800L/h), the ammonia escape amount is 0.1mg/m3, the system operation is stable, the amount of the ammonia water used for clinker per ton is saved by about 2L/t compared with the amount of the ammonia water used for the traditional SNCR system, and the economic benefit is about 1.4 yuan/t.cl for clinker per ton.
After the scheme is adopted, the NOx emission concentration of a cement plant is further reduced, the using amount of denitration ammonia water is reduced, and the corrosion of system ammonia escape to equipment and secondary pollution to atmosphere are reduced.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without modification to the method and technical solution of the present invention, or the present invention can be directly applied to other occasions without modification, all within the scope of the present invention.
Claims (3)
1. The utility model provides a cement kiln denitration system for flue gas which characterized in that has:
a kiln body;
the decomposing furnace is connected with the kiln body;
the five-stage cyclone system is connected with the kiln body and the decomposing furnace and comprises a primary cyclone, a secondary cyclone, a tertiary cyclone, a four-stage cyclone and a five-stage cyclone;
the ammonia spraying gun is arranged in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part of the five-stage cyclone, at the outlet of the straight cylinder and at the outlet of the five-stage cyclone.
2. The cement kiln flue gas denitration system as defined in claim 1, wherein the ammonia injection lance is movably mounted in the middle of the decomposing furnace, at the inlet of the five-stage cyclone, at the conical part and the straight part of the five-stage cyclone, at the outlet of the five-stage cyclone; the insertion angle and the depth of the ammonia spraying gun can be adjusted.
3. The cement kiln flue gas denitration system as set forth in claim 2, wherein said five-stage cyclone includes an upper straight portion and a lower tapered portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920071233.9U CN209848644U (en) | 2019-01-16 | 2019-01-16 | Denitration system for cement kiln flue gas |
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| CN201920071233.9U CN209848644U (en) | 2019-01-16 | 2019-01-16 | Denitration system for cement kiln flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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