CN114562875A - Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production - Google Patents

Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production Download PDF

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CN114562875A
CN114562875A CN202210077293.8A CN202210077293A CN114562875A CN 114562875 A CN114562875 A CN 114562875A CN 202210077293 A CN202210077293 A CN 202210077293A CN 114562875 A CN114562875 A CN 114562875A
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rotary
rdf
low
spouting
double
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CN114562875B (en
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李叶青
汪宣乾
王加军
魏茂
魏玉荣
马威
张谋
章鹏
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Huaxin Cement Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
    • F27B1/04—Combinations or arrangements of shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/16—Arrangements of tuyeres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0051—Burning waste as a fuel
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 relates to a three-spouting double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production, which comprises a kiln tail gas inlet flue, a precombustion chamber, a decomposing furnace body, a tertiary air distributing pipeline and a tertiary spouting shrinkage cavity, wherein the kiln tail gas inlet flue is provided with two primary coal injection points, and the top of the precombustion chamber is provided with two primary raw material feeding ports and a primary RDF feeding portThe device comprises a port and a secondary coal injection point, wherein double-rotary-cutting tertiary air inlets are arranged on two sides of a precombustion chamber, and two liquid waste feeding points are arranged in a cone area of the precombustion chamber; the bottom of the lower column body is provided with two secondary raw material feeding ports and two secondary RDF feeding ports, the middle of the lower column body is provided with two tertiary raw material feeding ports, the upper column body is provided with two tertiary RDF feeding ports, and the upper column body is provided with two four-level RDF feeding ports. According to the invention, functional areas with different gradients are constructed through the multi-plane design of the decomposing furnace, so that the efficient combustion of large-scale RDF in the decomposing furnace and the gasification reduction denitration of a specific area are ensured, and the CO content in the cement production process is reduced2And NOxAnd (4) discharging.

Description

Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production
Technical Field
The invention relates to cement production equipment, in particular to a three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production.
Background
The cement is a basic raw material for national economic construction and an important base stone for supporting social development, and the cement industry becomes an important source for energy consumption and industrial waste gas emission due to the inherent characteristics of the cement production process. According to statistics, about 1.7 million tons of standard coal is directly consumed by the national cement industry every year, about 13.9 million tons of carbon dioxide are emitted when about 1600 million kilowatts of electricity are consumed, about 95 million tons of nitrogen oxides are emitted, and the carbon dioxide emitted by the cement industry accounts for about 13.9 percent of the total amount of the carbon dioxide emitted by the nation. Therefore, how to realize low-carbon low-nitrogen emission in cement production is a problem to be solved urgently in the current cement industry.
For cement production, one main means of carbon emission reduction is to reduce the consumption of traditional fossil fuels, and European and American countries have used part of domestic garbage as derived fuels in the cement industry, so that the heat substitution rate TSR can reach more than 80%, the total carbon emission is effectively reduced, and huge social and economic benefits are generated. The cement industry in China has already gone on the road after the development of more than ten years, and a plurality of cement production enterprises put Refuse Derived Fuel (RDF) into cement production practice and obtain a series of benefits. However, as the domestic refuse derived fuel has the characteristics of high moisture, large granularity, low heat value, poor uniformity and the like, the direct feeding of the refuse derived fuel into a conventional decomposing furnace causes unreasonable distribution of multiphase flow fields in the furnace, large fluctuation of system working conditions, incomplete combustion of the fuel and reduction of the decomposition rate of raw materials, and various factors limit the large-scale use of RDF in a cement kiln system.
In addition, in the cement production process, because the kiln head flame temperature is generally over 1700 ℃, a large amount of thermal NOx and fuel NOx are generated in the kiln, and the thermal NOx is mainly generated. The classified combustion of the kiln tail is used as one of the technologies for cement low-nitrogen production, and mainly comprises fuel classification and three-time flue gas classification, the two classification modes are researched more and are mature technologies, but the denitration efficiency of the two classification modes is not high and is only about 30%. For the traditional precombustion chamber decomposing furnace, due to the rotary cutting effect of airflow on the inner wall of the precombustion chamber, after the staged combustion is adopted, the volume of a denitration reduction zone is small, the discharge amount of nitrogen oxides is not well controlled, and the low-nitrogen production of cement can be realized only by using other modes.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production.
The technical scheme adopted by the invention for solving the technical problems is as follows: the three-spouting double-rotary-cutting gradient combustion low-carbon and low-nitrogen environment-friendly decomposing furnace for cement production is constructed and comprises a kiln tail air inlet flue, a pre-combustion chamber, a decomposing furnace body, a tertiary air distributing pipeline and a tertiary spouting contraction port, wherein the decomposing furnace body is sequentially provided with a lower cylinder, a middle contraction port and an upper cylinder from bottom to top; the first spouting reducing port is positioned at the joint of the kiln tail air inlet flue and the pre-combustion chamber, the second spouting reducing port is positioned at the joint of the pre-combustion chamber and the lower cylinder, and the third spouting reducing port is a middle reducing port of the decomposing furnace body;
the kiln tail gas inlet flue is provided with two primary coal injection points, the top of the precombustion chamber is provided with two primary raw material feeding ports, a primary RDF feeding port and a secondary coal injection point, two sides of the precombustion chamber are provided with double-rotary-cut tertiary air inlets, two tertiary air distribution pipelines are arranged at the two double-rotary-cut tertiary air inlets, the two tertiary air distribution pipelines are connected and communicated with a cylinder at the lower part of the decomposing furnace, and a cone area of the precombustion chamber is provided with two liquid waste feeding points; the bottom of the lower cylinder is provided with two secondary raw material feeding ports and two secondary RDF feeding ports, the middle of the lower cylinder is provided with two tertiary raw material feeding ports, the upper cylinder is provided with two tertiary RDF feeding ports close to a middle reducing port, and a flue gas outlet of the upper cylinder is provided with two quaternary RDF feeding ports;
the kiln tail gas inlet flue and the cone area of the precombustion chamber form a homogeneous phase gasification denitration area, and the coal powder and the RDF are quickly gasified and cracked in the homogeneous phase gasification denitration area to generate a reducing agent to eliminate NO generated in the kilnx(ii) a The tertiary air introduced by the two double-rotary-cut tertiary air inlets enters the pre-combustion chamber in a 180-degree double-rotary-cut manner on the same axial height, an out-of-phase denitration area is formed between the pre-combustion chamber and the tertiary air inlets, and the coal powder and residual coke gasified by RDF generate reducing agent in the oxygen-deficient atmosphere of the out-of-phase denitration area to further eliminate NO generated in the furnacex。
According to the scheme, the height of the first spouting necking is 1.5-2.0 m, and the air speed of the first spouting necking is controlled to be 28-35 m/s.
According to the scheme, the residence time of the flue gas in the kiln in the homogeneous phase gasification denitration zone is 0.8-1.5 s.
According to the scheme, the average residence time of the flue gas in the heterogeneous denitration zone is 1.8-2.5 s.
According to the scheme, the flue gas and the particulate matters in the decomposing furnace behind the tertiary air distributing pipeline enter the burnout zone above the heterogeneous denitration zone after the tertiary air is sprayed, and the retention time of the flue gas in the burnout zone is 3.5-5.0 s.
According to the scheme, the primary coal injection points are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, and the secondary coal injection points are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center.
According to the scheme, the primary raw material feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, the secondary raw material feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, and the tertiary raw material feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center.
According to the scheme, the first-stage RDF feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, the second-stage RDF feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, the third-stage RDF feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center, and the fourth-stage RDF feeding ports are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center.
According to the scheme, the liquid waste feeding points are symmetrically arranged by taking the vertical axis of the decomposing furnace as the center.
According to the scheme, the top of the precombustion chamber is sequentially provided with the double rotary-cut tertiary air inlet, the primary raw material feeding port, the primary RDF feeding port and the two secondary coal injection points clockwise, and the secondary coal injection points are just opposite to the intersection of direct injection airflow and rotary-cut airflow of the kiln tail flue.
The three-spouting double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production has the following beneficial effects:
1. the invention designs and develops heterogeneous RDF, multi-point regional feeding of raw materials and pulverized coal, divides a decomposing furnace into a plurality of functional regions, and sequentially comprises a light RDF combustion region, a small heavy RDF combustion region, a large heavy RDF combustion region and the like from low to high on an axis. The raw materials entering the decomposing furnace are divided into 3 layers and enter the decomposing furnace, and the 3 layers are a precombustion chamber, the bottom and the middle of a main furnace body of the decomposing furnace from low to high. The axial temperature field of the decomposing furnace is regulated and controlled by feeding raw materials in a gradient manner, a controllable high-temperature area is formed in the precombustion chamber, and the burning rate of RDF and pulverized coal in the precombustion chamber and the decomposition rate of the raw materials are improved.
2. By adopting a graded combustion superposition RDF gasification denitration technology, a homogeneous denitration area is constructed in the conical part of the precombustion chamber, and RDF and pulverized coal volatile matter are quickly cracked in an oxygen-poor atmosphere with the oxygen content of 0-1% to separate out thermal NOx in the reduction kiln; an out-of-phase denitration area is constructed between the top of the pre-combustion chamber and a port of the tertiary air distributing pipe into the decomposing furnace, the oxygen content of the area is 0-2%, the area is in a weak oxygen-poor state, on one hand, reducing agents such as CO/-CH and the like can be separated out from the coke to be used for reducing NOx, on the other hand, the combustion path of the coke is changed in the weak oxygen-poor state, and the generation of fuel type NOx can be reduced; and (3) constructing an oxygen-enriched combustion area after the tertiary air distributing pipe enters a decomposing furnace interface, rotatably cutting 40% of pure tertiary air into the furnace, mixing the tertiary air with the flue gas of the main furnace, and ensuring that the RDF and the residual coke are burnt out in the area.
3. Through designing and developing a technology of three-time air double-rotary-cut feeding, two-strand three-time air enters the precombustion chamber in the same rotary direction in a rotary cutting mode, the rotary momentum of the three-time air is enhanced, the formed vortex airflow strengthens the mixing of gas and solid phases in the radial direction of the decomposing furnace, and the effective furnace volume utilization rate of the decomposing furnace is improved. In the initial stage of feeding the light RDF into the precombustor, the light RDF in an agglomerated state is then broken up and accelerated by the high-temperature, high-speed rotating tertiary air. Wherein, a part of RDF is preheated, gasified and combusted along with the rotation of tertiary air, the size is continuously reduced in the process, and finally the RDF enters the middle part of the decomposing furnace to be continuously combusted along with the tertiary air spurting from the middle part of the decomposing furnace; the other part of RDF collides with the inner wall of the precombustion chamber in the rotating process due to the action of centrifugal force, slides down to the smoke chamber reducing opening together with rotary-cut adherent raw meal, and enters a complex rotary-jet flow field in the precombustion chamber again under the spouting action of high-speed kiln gas at the smoke chamber reducing opening to continuously complete combustion and decomposition.
4. The three-time spouting decomposing furnace is designed and developed, and is divided into a lower smoke chamber necking spouting at the bottom of a precombustion chamber, a precombustion chamber outlet spouting in the middle and a decomposing furnace main body spouting at the upper part from bottom to top in sequence. After three times of spouting, the flow field, the temperature field, the physical field and the chemical field in the decomposing furnace are further uniform, the mass transfer and the heat transfer in the decomposing furnace are enhanced, and the effective furnace volume utilization rate of the decomposing furnace is improved. Through the reinforced back mixing of the three times of spouting, the retention time of the RDF, the raw materials and the coal powder in the decomposing furnace is increased, the mixing and oxygen supply capacity of combustion-supporting air is enhanced, and the burnout of the RDF and the coal powder in the decomposing furnace and the decomposition of the raw materials are ensured.
5. The invention can ensure that various RDFs are respectively fed into the center of the furnace body from different planes of the decomposing furnace at multiple points according to the characteristics of granularity, moisture, density, combustion speed and the like, further strengthen the mass transfer, heat transfer and back mixing effects of gas and solid phases in the decomposing furnace, strengthen the combustion and decomposition coupling action of the pulverized coal-RDF-raw material, and realize the preheating, gasification, denitration and efficient low-carbon combustion of the RDFs and the pulverized coals at the bottom of the decomposing furnace.
6. According to the invention, functional areas with different gradients are constructed through the multi-plane design of the decomposing furnace, so that the efficient combustion of large-scale RDF in the decomposing furnace and the gasification reduction denitration in a specific area are ensured, the heat substitution rate of the whole kiln system for substituting fuel is 35-50%, and the clinker CO per ton is obtained2Emission reduction is carried out for 150-180 kg, and the dosage of the denitration ammonia water is reduced by 70% -85%.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a schematic representation of a RDF gradient combustion zone division of FIG. 1;
FIG. 6 is a functional division diagram of the denitration function of FIG. 1;
in the figure: 1-kiln tail gas inlet flue; 2-a precombustion chamber; 3-decomposing furnace body; 4-tertiary air distributing pipeline; 5-three times of spouting shrinkage; 6-first-stage coal injection point; 7-first-level raw material feeding port; 8-first stage RDF feeding port; 9-secondary coal injection points; 10-tertiary air inlet; 11-a column at the lower part of the decomposing furnace; 12-prechamber cone area; 13-liquid waste feed point; 14-necking the middle part of the decomposing furnace body; 15-a column at the upper part of the decomposing furnace; 16-a secondary raw material feeding port; 17-a secondary RDF feed port; 18-third-level raw material feeding ports; 19-three stage RDF feed ports; 20-four stages of RDF feeding ports.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in figures 1-6, the three-spouting double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production comprises a kiln tail air inlet flue 1, a precombustion chamber 2, a decomposing furnace body 3, a tertiary air distributing pipeline 4 and a tertiary spouting reducing port 5.
The kiln tail gas inlet flue 1 is provided with two primary coal injection points 6, the top of the precombustion chamber 2 is provided with two primary raw material feeding ports 7, a primary RDF feeding port 8 and a secondary coal injection point 9, two sides of the precombustion chamber 2 are provided with double rotary-cut tertiary air inlet ports 10, two double rotary-cut air inlet ports are provided with two tertiary air distribution pipelines 4, the tertiary air distribution pipelines 4 are connected and communicated with a lower cylinder 11 of the decomposing furnace, and a cone area 12 of the precombustion chamber 2 is provided with two liquid waste feeding points 13; the decomposing furnace body 3 sequentially comprises a lower cylinder 11, a middle necking 14 and an upper cylinder 15 from bottom to top, wherein the bottom of the lower cylinder 11 is provided with two secondary raw material feeding ports 16 and two secondary RDF feeding ports 16, the middle of the lower cylinder 11 is provided with two tertiary raw material feeding ports 18, the upper cylinder 15 is provided with two tertiary RDF feeding ports 19 close to the middle necking 14, and the smoke outlet of the upper cylinder 15 is provided with two four-level RDF feeding ports 20.
The first-time spouting reducing port is positioned at the joint of the kiln tail air inlet flue 1 and the precombustion chamber 2, the second-time spouting reducing port is positioned at the joint of the precombustion chamber 2 and the lower cylinder 11, and the third-time spouting reducing port is a middle reducing port 14 of the decomposing furnace body.
In the embodiment, the height of the first spouting contraction port at the kiln tail air inlet flue 1 is 1.5-2.0 m, the contraction port air speed is controlled to be 28-35 m/s, and the spouting effect of RDF in the precombustion chamber 2 is enhanced.
Two primary coal injection points 6 are arranged on the kiln tail gas inlet flue 1, a homogeneous phase gasification denitration area is formed on the gas inlet flue 1 and the cone part of the precombustion chamber 2, and the pulverized coal and the RDF are quickly gasified and cracked in the area to generate a reducing agent to eliminate NO generated in the kilnxThe residence time of the flue gas in the kiln in the area is about 0.8-1.5 s, and NO in the kilnxThe reduction rate reaches 70-80%.
The tertiary air is divided into two parts and enters the precombustion chamber 2 in a 180-degree double-cyclone cutting mode on the same axial height, so that a strong cyclone is formed, and the mixing effect of gas and solid phases is improved.
Two tertiary air distributing pipelines are arranged4 enters the lower part of the reducing mouth of the decomposing furnace body 3, controls the air distribution proportion to be 35-40 percent, and enters the main furnace body in a 180-degree double-rotation way on the same axial height. A heterogeneous denitration area is formed between the precombustion chamber 2 and the air inlet of the air distribution pipeline, the pulverized coal and residual coke after RDF gasification generate reducing agent in the oxygen-poor atmosphere to further eliminate NOx generated in the furnace, the average residence time of the flue gas in the area is 1.8-2.5 s, NO is in the range of NOxThe background value of the carbon dioxide is reduced to 200-240 mg/Nm3,10％O2。
And the smoke and the particulate matters in the decomposing furnace behind the tertiary air distributing pipeline 4 enter a burnout zone after being sprayed for the third time, and the retention time of the smoke in the burnout zone is 3.5-5.0 s.
Each stage of coal injection point, raw meal feeding point, RDF feeding point and liquid waste point must be arranged symmetrically about the vertical axis of the decomposing furnace.
Feeding points at the top of the precombustion chamber 2 are arranged clockwise, and are a double-rotary-cut tertiary air inlet 10, a primary raw material feeding port 7, a primary RDF feeding port 8 and two secondary coal injection points 9 in sequence, and meanwhile, the secondary coal injection points 9 are right opposite to the junction of direct injection airflow and rotary-cut airflow of a kiln tail flue.
The three-time spouting necking is arranged to ensure that the gas phase and the solid phase are fully mixed and uniformly distributed in the decomposing furnace, a back mixing effect is formed through the necking spouting, and the retention time of the particle materials is prolonged.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The three-spouting double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production is characterized by comprising a kiln tail air inlet flue, a pre-combustion chamber, a decomposing furnace body, a tertiary air distributing pipeline and a tertiary spouting shrinkage cavity, wherein the decomposing furnace body is sequentially provided with a lower cylinder, a middle shrinkage cavity and an upper cylinder from bottom to top; the first spouting reducing port is positioned at the joint of the kiln tail air inlet flue and the pre-combustion chamber, the second spouting reducing port is positioned at the joint of the pre-combustion chamber and the lower cylinder, and the third spouting reducing port is a middle reducing port of the decomposing furnace body;
the kiln tail gas inlet flue is provided with two primary coal injection points, the top of the precombustion chamber is provided with two primary raw material feeding ports, a primary RDF feeding port and a secondary coal injection point, two sides of the precombustion chamber are provided with double-rotary-cut tertiary air inlets, two tertiary air distribution pipelines are arranged at the two double-rotary-cut tertiary air inlets, the two tertiary air distribution pipelines are connected and communicated with a cylinder at the lower part of the decomposing furnace, and a cone area of the precombustion chamber is provided with two liquid waste feeding points; the bottom of the lower cylinder is provided with two secondary raw material feeding ports and two secondary RDF feeding ports, the middle of the lower cylinder is provided with two tertiary raw material feeding ports, the upper cylinder is provided with two tertiary RDF feeding ports close to a middle reducing port, and a flue gas outlet of the upper cylinder is provided with two quaternary RDF feeding ports;
the kiln tail gas inlet flue and the cone area of the precombustion chamber form a homogeneous phase gasification denitration area, and the coal powder and the RDF are quickly gasified and cracked in the homogeneous phase gasification denitration area to generate a reducing agent to eliminate NO generated in the kilnx(ii) a The tertiary air introduced by the two double-rotary-cut tertiary air inlets enters the pre-combustion chamber in a 180-degree double-rotary-cut manner on the same axial height, an out-of-phase denitration area is formed between the pre-combustion chamber and the tertiary air inlets, and the coal powder and residual coke gasified by RDF generate reducing agent in the oxygen-deficient atmosphere of the out-of-phase denitration area to further eliminate NO generated in the furnacex。
2. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the height of the first-time spouting shrinkage cavity is 1.5-2.0 m, and the wind speed of the first-time spouting shrinkage cavity is controlled to be 28-35 m/s.
3. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the residence time of the flue gas in the kiln in the homogeneous gasification denitration zone is 0.8-1.5 s.
4. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the average residence time of flue gas in the heterogeneous denitration zone is 1.8-2.5 s.
5. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, characterized in that flue gas and particulate matters in the decomposition furnace behind the tertiary air distribution pipeline enter a burnout zone located above the heterogeneous denitration zone after being spouted for the third time, and the residence time of the flue gas in the burnout zone is 3.5-5.0 s.
6. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the primary coal injection points are symmetrically arranged with respect to a vertical axis of the decomposition furnace as a center, and the secondary coal injection points are symmetrically arranged with respect to the vertical axis of the decomposition furnace as a center.
7. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the primary raw material feeding ports are symmetrically arranged around the vertical axis of the decomposition furnace, the secondary raw material feeding ports are symmetrically arranged around the vertical axis of the decomposition furnace, and the tertiary raw material feeding ports are symmetrically arranged around the vertical axis of the decomposition furnace.
8. The three-spouting double-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein the first-stage RDF feeding ports are symmetrically arranged around a vertical axis of the decomposition furnace, the second-stage RDF feeding ports are symmetrically arranged around a vertical axis of the decomposition furnace, the third-stage RDF feeding ports are symmetrically arranged around a vertical axis of the decomposition furnace, and the fourth-stage RDF feeding ports are symmetrically arranged around a vertical axis of the decomposition furnace.
9. The three-spouting two-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposing furnace for cement production according to claim 1, wherein the liquid waste feeding points are symmetrically arranged with a vertical axis of the decomposing furnace as a center.
10. The three-spouting two-rotary-cut gradient combustion low-carbon and low-nitrogen environment-friendly decomposition furnace for cement production according to claim 1, wherein a double-rotary-cut tertiary air inlet, a primary raw material feeding port, a primary RDF feeding port and two secondary coal injection points are sequentially arranged on the top of the precombustion chamber in a clockwise direction, and the secondary coal injection points are opposite to the intersection of direct injection airflow and rotary-cut airflow in a kiln tail flue.
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CN2573977Y (en) * 2002-10-16 2003-09-17 天津水泥工业设计研究院 Decomposing furnace with double vortex preburning chamber
CN201032369Y (en) * 2007-05-21 2008-03-05 南京凯盛水泥技术工程有限公司 Multilevel sprayed decomposition furnace
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CN102080926A (en) * 2009-11-30 2011-06-01 华新水泥股份有限公司 High-efficiency environmentally-friendly predecomposition furnace
CN102260052A (en) * 2010-05-30 2011-11-30 成都建筑材料工业设计研究院有限公司 Unlimited compatible method for producing cement clinker by using carbide slag and limestone as raw material
CN102633452A (en) * 2012-03-27 2012-08-15 安徽海螺建材设计研究院 Out-of-kiln pre-decomposition system for cement clinker
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2365621Y (en) * 1999-03-04 2000-02-23 国家建筑材料工业局天津水泥工业设计研究院 Combined decomposition furnace with bottom swirl pre-combustion chamber
CN2573977Y (en) * 2002-10-16 2003-09-17 天津水泥工业设计研究院 Decomposing furnace with double vortex preburning chamber
CN201059860Y (en) * 2007-01-31 2008-05-14 天津水泥工业设计研究院有限公司 Three spraying environment-friendly type decompose stove
CN201032369Y (en) * 2007-05-21 2008-03-05 南京凯盛水泥技术工程有限公司 Multilevel sprayed decomposition furnace
CN102080926A (en) * 2009-11-30 2011-06-01 华新水泥股份有限公司 High-efficiency environmentally-friendly predecomposition furnace
CN102260052A (en) * 2010-05-30 2011-11-30 成都建筑材料工业设计研究院有限公司 Unlimited compatible method for producing cement clinker by using carbide slag and limestone as raw material
CN102633452A (en) * 2012-03-27 2012-08-15 安徽海螺建材设计研究院 Out-of-kiln pre-decomposition system for cement clinker
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