CN215233281U - SNCR denitration system of low nitrogen transformation of cement kiln tail smoke chamber - Google Patents

SNCR denitration system of low nitrogen transformation of cement kiln tail smoke chamber Download PDF

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CN215233281U
CN215233281U CN202023197479.2U CN202023197479U CN215233281U CN 215233281 U CN215233281 U CN 215233281U CN 202023197479 U CN202023197479 U CN 202023197479U CN 215233281 U CN215233281 U CN 215233281U
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kiln tail
pipe
low
smoke chamber
decomposing furnace
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周荣
彭兴华
詹杰
吴建
朱俊
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Zhejiang Institute Of Ecological Environmental Science Design And Research
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Zhejiang Institute Of Ecological Environmental Science Design And Research
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Abstract

The application discloses a SNCR (selective non-catalytic reduction) denitration system for low-nitrogen modification of a kiln tail smoke chamber of a cement kiln, which comprises a kiln tail smoke chamber at the tail part of a rotary kiln; the device also comprises a decomposing furnace, a preheater, a waste heat boiler, a raw meal mill, a kiln tail dust remover and a kiln tail chimney which are arranged in sequence along the smoke direction; ammonia water spraying layers are arranged in the decomposing furnace and an outlet flue of the decomposing furnace; bag for returningComprises the following steps: the first smoke leading point is arranged on the kiln tail smoke chamber; a second flue gas introduction point arranged on the lower-section cone of the decomposing furnace; and the low-nitrogen pipe is additionally arranged between the first leading contact and the second leading contact and is provided with a coal powder feeding port. Control of NOx in flue gas from rotary kiln to < 200mg/m in oxygen-deficient environment by using carbon in fuel3And returning the flue gas back to the decomposing furnace.

Description

SNCR denitration system of low nitrogen transformation of cement kiln tail smoke chamber
Technical Field
The utility model relates to a cement kiln flue gas treatment technical field, concretely relates to SNCR deNOx systems of cement kiln tail smoke chamber low nitrogen transformation.
Background
NO reduction from the comprehensive implementation of ultra-low emission transformation in the thermal power and steel industriesxPerform 50mg/m3The ultra-low emission standard of (1), and the cement industry in the same period executes the emission standard of atmospheric pollutants in the cement industry (GB4915-2013), and the emission limit of NOx is 400mg/m3(Special emission Limit 320mg/m3) The NOx emission per unit smoke amount is 6.4-8 times that of the thermal power and steel industries, and NOxThe total emission amount exceeds the first total emission amount of industrial pollution sources, and the emission reduction pressure is huge. The discharge standard of the atmospheric pollutants in the cement industry is continuously tightened, and the provinces of Henan and Hebei have formally released local standards, NOxThe emission limit is strictly less than 100mg/m3In the above two provinces, during the standard solicitation, it was assumed that the NOx emission limit was tightened to 50mg/m3And is limited to no reliable technical support. At present, aiming at the discharge concentration of NOx in the flue gas of a cement kiln to be less than 100mg/m3The technology of (2) is relatively mature, but the technology is further tightened to 50mg/m3, so that the problems exist in the aspects of accessibility and stability of NOx indexes, ammonia emission concentration control, ammonia water consumption, construction and operation cost and the like, and no good response to the NOx emission concentration of less than 50mg/m in a cement kiln is available3The patented technology of (1).
SUMMERY OF THE UTILITY MODEL
The application provides a SNCR deNOx systems that cement kiln tail smoke chamber low nitrogen was reformed transform combines low nitrogen to reform transform and SNCR spouts ammonia and reforms transform, reaches cement kiln NOx emission concentration < 50mg/m3The emission standard of (1).
A SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber comprises a kiln tail smoke chamber at the tail of a rotary kiln; the device also comprises a decomposing furnace, a preheater, a waste heat boiler, a raw meal mill, a kiln tail dust remover and a kiln tail chimney which are arranged in sequence along the smoke direction; ammonia water spraying layers are arranged in the decomposing furnace and an outlet flue of the decomposing furnace; the preheater is a 5-stage cyclone preheater and sequentially comprises a C5-stage preheater, a C4-stage preheater, a C3-stage preheater, a C2-stage preheater and a C1-stage preheater along the flow direction of flue gas; further comprising:
the first smoke leading point is arranged on the kiln tail smoke chamber;
a second flue gas introduction point arranged on the lower-section cone of the decomposing furnace;
add in low nitrogen pipe between kiln tail smoke-box and the dore furnace, low nitrogen pipe includes tedge, arc linking pipe and downcomer, tedge, arc linking pipe and downcomer link up in proper order and are the inverse U-shaped pipe along the flue gas flow direction, the bottom of tedge is passed through smoke-box and is drawn and connect the section intercommunication first smoke-box draw point, the bottom of downcomer is drawn and is connected the section intercommunication through dore furnace second smoke-box draw point, set up buggy throwing feeding port on the pipeline section at tedge place.
The high-efficiency low-nitrogen modification firstly carries out capacity expansion modification on a kiln tail smoke chamber, a long-size high-capacity high-efficiency low-nitrogen pipe is led out from the smoke chamber, pulverized coal is sprayed into the area to form a large-capacity reducing area, and NOx in smoke from the rotary kiln is controlled to be less than 200mg/m by utilizing carbon in fuel in an oxygen-deficient environment3And returning the flue gas back to the decomposing furnace.
In order to form a sufficient reduction area as far as possible, the drawn low-nitrogen pipe consists of a rising pipe, an inverted U-shaped arc connection and a descending pipe according to the flow rate of flue gas, the lower part of the rising pipe is used as a drawing joint to be connected with a kiln tail flue chamber, the lower part of the descending pipe is connected with the lower part of the decomposing furnace, and the flue gas is sent back to the lower part of the decomposing furnace.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the system further comprises an ammonia water injection layer respectively added in the connecting flue between the C5-stage preheater and the C4-stage preheater and the connecting flue between the C4-stage preheater and the C3-stage preheater.
Optionally, the ammonia water injection layer comprises a plurality of ammonia water spray guns, and the ammonia water spray guns are uniformly distributed in the corresponding injection layer.
Optionally, the liquid inlet of each ammonia water spray gun is independently connected with the ammonia water distribution module, and a control valve and a flow meter are independently configured on each connecting pipeline; the gas inlet of each ammonia water spray gun is independently connected with the compressed air distribution module, and a control valve, a flowmeter and a pressure gauge are independently arranged on each connecting pipeline.
SNCR denitration spray guns are arranged at the upper part of the decomposing furnace and a C5-level cyclone preheater (the temperature window interval of 850-980 ℃), and an intelligent SNCR denitration control system is combined to realize accurate ammonia spraying and control the NOx emission concentration to 50-100mg/m 3. Preferably, the intelligent SNCR denitration spray gun is mainly arranged at the upper part of the decomposing furnace, the outlet of the decomposing furnace, a C5-grade cyclone preheater and the outlet of a C4-grade cyclone preheater; compared with the traditional SNCR denitration spray gun arrangement, the spray gun arrangement with relative planarization is three-dimensional, and the potential post-combustion area is effectively covered aiming at the potential overload production of the current cement clinker line.
Optionally, the top height of the low-nitrogen pipe is within the height section of 2/3-4/5 of the decomposing furnace.
Optionally, the pipe diameters of the ascending pipe, the arc-shaped connecting pipe and the descending pipe are 0.6-0.8 times of the inner diameter of the decomposing furnace.
Optionally, the coal powder feeding port is located in a height section below the middle part of the ascending pipe.
Drawings
FIG. 1 is a schematic diagram of the system of the application;
FIG. 2 is a schematic structural view of the low nitrogen engineered part of FIG. 1;
FIG. 3 is a schematic structural diagram of the intelligent ammonia injection part in FIG. 1.
The reference numerals shown in the figures are as follows:
1-rotary kiln 2-kiln tail smoke chamber 3-decomposing furnace
4-low nitrogen pipe 5-intelligent SNCR ammonia spraying assembly 6-humidifying tower
7-waste heat boiler 8-high temperature fan 9-raw meal mill
10-kiln tail dust remover 11-tail exhaust fan 12-kiln tail chimney
13-flue gas analyzer 14-outlet flue of decomposing furnace 15-C5 stage preheater and connecting flue of C4 stage preheater
Connecting flue of 16-C4 stage preheater and C3 stage preheater
41-smoke chamber leading connection section 42-ascending pipe 43-arc connecting pipe
44-downcomer 45-decomposing furnace cone leading segment
51-first ammonia water injection layer 52-second ammonia water injection layer 53-third ammonia water injection layer
54-fourth ammonia injection layer 55-ammonia distribution module 56-compressed air distribution module
57-intelligent control module 58-main production system DCS signal set
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples used in describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in figure 1, the SNCR denitration system for low-nitrogen modification of the cement kiln tail smoke chamber comprises a kiln tail smoke chamber 2, the kiln tail smoke chamber 2 is positioned at the tail part of a rotary kiln, an outlet flue 15 of a decomposing furnace 3 is connected with a preheater, the preheater adopts a 5-level cyclone preheater, the 5-level cyclone preheater is sequentially arranged along the flow direction of smoke, the C5-level preheater, the C4-level preheater, the C3-level preheater, the C2-level preheater and the C1-level preheater are sequentially arranged along the flow direction of the smoke and are connected through flues, the outlet flue 15 of the decomposing furnace 3 is connected with the C5-level preheater, the outlet of the C1-level preheater is connected with a tower 6 and/or a waste heat boiler 7 through flues, the humidifying tower 6 and the waste heat boiler 7 are arranged in parallel, the smoke outlets of the humidifying tower 6 and the waste heat boiler 7 are connected with a high-temperature fan 8 through flues, the high-temperature fan 8 is connected with a raw meal mill 9 through flues, the smoke outlet of the raw meal mill 9 is connected with a kiln tail dust remover 10 through flues, or the high-temperature fan 8 is directly connected with the kiln tail dust remover 10 through a flue, the flue gas of the kiln tail dust remover 10 is sent into a kiln tail chimney 12 through a tail exhaust fan 11, and a flue gas analyzer 13 is arranged at the outlet of the kiln tail chimney 12.
On the basis, low-nitrogen transformation is carried out on a kiln tail smoke chamber and a decomposing furnace section of a cement kiln production line, the core equipment of the low-nitrogen transformation is a low-nitrogen pipe, and particularly, a low-nitrogen pipe assembly 4 is additionally arranged at a kiln tail smoke chamber 2 and a decomposing furnace 3; the low-nitrogen pipe 4 is, as shown in fig. 1 and 2, composed of an ascending pipe 42, an arc-shaped connecting pipe 43 and a descending pipe 44, the ascending pipe and the descending pipe are arranged in parallel and vertically, the arc-shaped connecting pipe is connected with the ascending pipe and the descending pipe, the bottom of the ascending pipe 42 is a smoke chamber leading section 41, the smoke chamber leading section 41 is communicated with the kiln tail smoke chamber 2, the bottom of the descending pipe is a decomposing furnace cone leading section 45, and the decomposing furnace cone leading section 45 is communicated with the bottom cone section of the decomposing furnace 3. The main structure of the low nitrogen pipe composed of the ascending pipe 42, the arc connecting pipe 43 and the descending pipe 44 is in an inverted U-shaped structure, and a coal powder feeding point is arranged on the section of the ascending pipe 42.
The outlet of the rotary kiln 1 of the cement clinker line is connected to a kiln tail smoke chamber 2, a funnel flue from the kiln tail smoke chamber 2 to a decomposing furnace 3 is cut off, a first leading point is formed by transforming the kiln tail smoke chamber 2, a rising pipeline of a low nitrogen pipe is led and connected, the smoke is turned by an inverted U-shaped arc connecting pipe at the top, and the smoke is discharged by a descending pipeThe gas is sent back to the decomposing furnace through a second leading joint modified on the cone part of the decomposing furnace 3. Continuously spraying coal powder into the low-nitrogen pipe. The flue gas of the kiln tail smoke chamber is all led into the low-nitrogen pipe, and the concentration of NOx in the flue gas entering the decomposing furnace is controlled to be less than 200mg/m by forming a large reduction space3。
In one embodiment, the height of the top end of the ascending pipe is 2/3-4/5 of the height of the decomposing furnace; the pipe diameters of the ascending pipe, the arc-shaped connecting pipe and the descending pipe are 0.6-0.8 times of the inner diameter of the decomposing furnace, and the pipe diameters of the ascending pipe, the arc-shaped connecting pipe and the descending pipe are the same.
In one embodiment, the coal powder feeding port is positioned in the section of the riser at a height below the middle part of the riser.
This application still spouts the ammonia section to SNCR and reforms transform, spout ammonia equipment and reform transform to spouting the ammonia point including selecting intelligence, it is specific, adopt intelligence SNCR to spout ammonia subassembly 5 in SNCR denitration section to add and spout the ammonia point in the connection flue of C5 level preheater and C4 level preheater and the connection flue of C4 level preheater and C3 level preheater.
The core reaction area of the intelligent SNCR denitration technology is an ammonia water injection system, the ammonia water injection system is arranged in a temperature window range of 950 ℃ below zero and is generally arranged at the upper part of a decomposing furnace and at each layer of spray guns from the decomposing furnace to a cyclone preheater flue, the spray guns are double-fluid spray guns in accordance with the traditional SNCR denitration technology, but the temperature range covered by the arrangement point is prolonged to the air outlet flue of a C4-level cyclone preheater so as to adapt to working condition fluctuation in a wider range and realize that the concentration of NOx in flue gas is controlled to be less than 50-100mg/m3。
In a specific embodiment, the intelligent SNCR ammonia spraying assembly 5 is shown in fig. 3 and includes a first ammonia water spraying layer 51, a second ammonia water spraying layer 52, a third ammonia water spraying layer 53, a fourth ammonia water spraying layer 54, an ammonia water distribution module 55, a compressed air distribution module 56 and an intelligent control module 57. The first ammonia water injection layer 51 is arranged in the decomposing furnace 3 and is arranged at the middle upper part in the decomposing furnace, and comprises a plurality of ammonia water spray guns; the second ammonia water injection layer 42 is arranged in the outlet flue 15 of the decomposing furnace, the rising section and the falling section of the inverted U-shaped section of the outlet flue are both provided with the ammonia water injection layers, and the ammonia water injection layers at the positions comprise a plurality of spray guns; the third ammonia water injection layer 43 is arranged in a connecting flue 16 of the C5-level preheater and the C4-level preheater, and the ammonia water also comprises a plurality of spray guns; the fourth ammonia water spraying layer 54 is arranged in the connecting flue 17 of the C4-stage preheater and the C3-stage preheater, and also comprises a plurality of spray guns. Conventional two-fluid spray guns were used for each spray gun.
The ammonia water distribution module 55 is respectively connected with the liquid inlets of all the spray guns of all the ammonia water injection layers through ammonia water distribution pipelines; the compressed air distribution module is respectively connected with the air inlets of all the spray guns of all the ammonia water injection layers through gas distribution pipelines; the ammonia dispensing module 55 and the compressed air dispensing module 56 are connected and controlled by an intelligent control module 57.
The ammonia water distribution module 55, the compressed air distribution module 56 and the intelligent control module 7 themselves all employ prior art. The intelligent SNCR ammonia spraying assembly further comprises a DCS signal set 58 of the owner production system, and the DCS signal set is connected to the intelligent control module. Aiming at the composition of the intelligent SNCR ammonia spraying assembly, the improvement point of the application is that an ammonia water spraying layer is additionally arranged in a connecting flue 16 of a C5-grade preheater and a C4-grade preheater and a connecting flue 17 of a C4-grade preheater and a C3-grade preheater.
The ammonia water of each injection layer is led from an ammonia water distribution module, each spray gun corresponds to one ammonia water distribution branch, and each ammonia water distribution branch is provided with a flowmeter and an adjusting valve; the compressed air is led from the compressed air distribution module, each injection layer corresponds to one distribution branch, and each distribution branch is provided with a flowmeter, a pressure gauge and a regulating valve; with the only supporting ooff valve difference of every spray gun of traditional SNCR denitration, the supporting governing valve of every spray gun of intelligence SNCR denitration can realize real-time regulation and control aqueous ammonia jet volume.
This application combines to carry out low nitrogen transformation and SNCR to current cement kiln production line and spouts the ammonia transformation, and the effective combination that low nitrogen transformation and SNCR spout the ammonia transformation can realize reducing NOx formation in the source, and accurate ammonia and the terminal denitration of reinforceing of spouting of in-process realizes that cement kiln flue gas NOx emission concentration < 50mg/m3Ultra-low emission targets.
Application example
The modification is carried out on a 5000t/d clinker line according to the scheme shown in figure 1The main design parameters are as follows: the air volume is 520000Nm3Initial NOx concentration before modification of 650-800mg/m3The NOx outlet concentration is less than 50mg/m after the design and the implementation of the transformation3Ammonia emission concentration < 8mg/m3。
Before modification, the smoke gas volume is 520000-560000 Nm3NOx emission concentration 680-750mg/m3After the traditional SNCR denitration modification is implemented, the NOx emission concentration is 320-400 mg/m3。
After the reconstruction is completed according to fig. 1, the debugging conditions are as follows:
the intelligent SNCR denitration system is set to be automatically put into operation, and the target NOx concentration is set to be 50mg/m3Closing a smoke baffle plate door at the inlet of the SCR reactor, and measuring the NOx emission concentration of a kiln tail chimney to be 41-50 mg/m3Ammonia consumption about 285L/min, NH when raw meal is ground3The discharge concentration is 4.6mg/m3When the raw material mill stops, a kiln tail chimney NH3The discharge concentration is 16mg/m3；
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber comprises a kiln tail smoke chamber at the tail of a rotary kiln; the device also comprises a decomposing furnace, a preheater, a waste heat boiler, a raw meal mill, a kiln tail dust remover and a kiln tail chimney which are arranged in sequence along the smoke direction; ammonia water spraying layers are arranged in the decomposing furnace and an outlet flue of the decomposing furnace; the preheater is a 5-stage cyclone preheater and sequentially comprises a C5-stage preheater, a C4-stage preheater, a C3-stage preheater, a C2-stage preheater and a C1-stage preheater along the flow direction of flue gas; it is characterized by also comprising:
the first smoke leading point is arranged on the kiln tail smoke chamber;
a second flue gas introduction point arranged on the lower-section cone of the decomposing furnace;
add in low nitrogen pipe between kiln tail smoke-box and the dore furnace, low nitrogen pipe includes tedge, arc linking pipe and downcomer, tedge, arc linking pipe and downcomer link up in proper order and are the inverse U-shaped pipe along the flue gas flow direction, the bottom of tedge is passed through smoke-box and is drawn and connect the section intercommunication first smoke-box draw point, the bottom of downcomer is drawn and is connected the section intercommunication through dore furnace second smoke-box draw point, set up buggy throwing feeding port on the pipeline section at tedge place.
2. The SNCR denitration system with low-nitrogen modification for the tail smoke chamber of the cement kiln as claimed in claim 1, further comprising ammonia water injection layers respectively added in a connecting flue between the C5-stage preheater and the C4-stage preheater and a connecting flue between the C4-stage preheater and the C3-stage preheater.
3. The SNCR denitration system of cement kiln tail smoke chamber low-nitrogen modification of claim 1, characterized in that the ammonia water injection layer comprises a plurality of ammonia water spray guns, and the ammonia water spray guns are uniformly distributed in the corresponding injection layer.
4. The SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber according to claim 3, characterized in that a liquid inlet of each ammonia water spray gun is independently connected with an ammonia water distribution module, and a control valve and a flow meter are independently arranged on each connecting pipeline; the gas inlet of each ammonia water spray gun is independently connected with the compressed air distribution module, and a control valve, a flowmeter and a pressure gauge are independently arranged on each connecting pipeline.
5. The SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber of claim 1, wherein the top height of the low-nitrogen pipe is within the 2/3-4/5 height section of the decomposing furnace.
6. The SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber according to claim 1, wherein the pipe diameters of the ascending pipe, the arc-shaped connecting pipe and the descending pipe are 0.6-0.8 times of the inner diameter of the decomposing furnace.
7. The SNCR denitration system for low-nitrogen modification of a cement kiln tail smoke chamber according to claim 1, characterized in that the coal powder adding port is positioned in a height section below the middle part of the ascending pipe.
CN202023197479.2U 2020-12-25 2020-12-25 SNCR denitration system of low nitrogen transformation of cement kiln tail smoke chamber Active CN215233281U (en)

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