CN115364666A - Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln - Google Patents
Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000003546 flue gas Substances 0.000 title claims abstract description 118
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 101
- 238000002156 mixing Methods 0.000 title claims abstract description 72
- 239000004568 cement Substances 0.000 title claims abstract description 38
- 238000010531 catalytic reduction reaction Methods 0.000 title description 4
- 239000007921 spray Substances 0.000 claims description 41
- 239000012530 fluid Substances 0.000 claims description 39
- 238000009826 distribution Methods 0.000 claims description 27
- 239000000428 dust Substances 0.000 claims description 25
- 238000009792 diffusion process Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000002918 waste heat Substances 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000306 component Substances 0.000 description 24
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006196 drop Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- 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
- F27D17/004—Systems for reclaiming waste heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue 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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a circulation blending and dedusting system for injecting multi-component flue gas by using cement kiln SCR denitration reducing agent, belonging to the technical field of atmospheric environmental protection and emission reduction in cement industry.
Description
Technical Field
The invention relates to the technical field of atmospheric environment-friendly SCR denitration in the cement industry, in particular to a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation mixing ash removal system which is arranged between a waste heat boiler and an SCR denitration device, can accelerate the evaporation of reducing agent atomized liquid drops in a flue, can effectively accelerate the uniform mixing of the reducing agent and flue gas, can effectively improve the flue gas flow field uniformity in the flue, and can capture dust with larger diameter in the flue gas.
Background
Nitrogen Oxides (NO) x ) The emission of the organic acid can cause environmental problems of haze, acid rain, photochemical pollution and other climate disasters, is also one of main greenhouse gases forming greenhouse effect, and brings great harm to human health and natural environment. China is a big country for producing and using cement industry, NO x Large discharge amount, about NO in China x 15% of the emissions are the third largest source of industrial pollution following the thermal and automotive industries.
SCR is the English abbreviation of the English Selective Catalytic Reduction, namely the Selective Catalytic Reduction technology, and the SCR denitration technology reduces NOx in the flue gas into N by using an amino reducing agent 2 Has high denitration efficiency and stable operation, and can control the ammonia escape to be 5mg/Nm 3 The method has the following advantages that the method is widely applied to industrial kilns NO at home and abroad as a mature denitration technology x The technical field of treatment. Compared with the mature SCR technology applied in the power industry, the application of the SCR technology in the cement industry is started later, and the research on the process design parameters of the SCR reactor is not mature enough.
The cement kiln flue usually adopts a circular flue with a larger inclination angle with a horizontal ground, and compared with a rectangular flue adopted by a coal-fired power plant, an ammonia spraying grid is not easy to arrange in the circular flue, so that a double-fluid spray gun is usually adopted in the cement kiln SCR denitration flue as a reducing agent injection system, and compared with the whole flue size, the mapping area of the double-fluid spray gun for injecting the reducing agent is smaller, so that the problem of high denitration efficiency caused by ammonia escape and non-uniform mixing of the reducing agent gas and the flue gas is caused.
Therefore, the device system which has strong reliability and simple structure and is used for spraying multi-component flue gas for the cement kiln SCR denitration system adopting the double-fluid spray gun as the reducing agent spraying system is provided, and the denitration efficiency of the cement kiln SCR denitration system is improved by improving the mixing uniformity of the reducing agent and the flue gas, accelerating the evaporation rate of atomized liquid drops of the reducing agent, reducing the ash-containing concentration of the flue gas and optimizing and adjusting the distribution of the flue gas flow field entering the SCR denitration system, so that the technical problem to be solved urgently by technical personnel in the field is solved.
Disclosure of Invention
The invention aims to provide a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system applied to a cement kiln SCR denitration system, which has a simple, reasonable and reliable structure, can effectively accelerate the uniform mixing of the reducing agent and the flue gas, accelerate the evaporation rate of atomized liquid drops of the reducing agent, reduce the ash content of the flue gas, and improve the uniformity of the whole flue gas flow field of an SCR reactor, thereby finally improving the whole denitration efficiency of the SCR system.
In order to achieve the purpose, the invention adopts the following technical scheme.
The cement kiln SCR denitration reducing agent injection multi-component flue gas circulation mixing and dedusting system is placed in an SCR inlet vertical circular flue between a waste heat boiler and an SCR denitration device, and sequentially consists of a bypass flue heat supplementing system, a reducing agent double-fluid spray gun, a multi-component flue gas circulation mixing and dedusting device and an annular rectifying grating along the flowing direction of flue gas.
The multi-component flue gas circulation mixing and ash removing device consists of a flue gas mixing and ash removing device shell, a reducing agent diffusion disc, a flue gas circulation cylindrical axis, a post circulation rotational flow blade, an ash collecting groove and an ash discharge pipeline, the shell of the flue gas mixing and ash removing device is coaxially arranged with the vertical round flue of the SCR inlet, the shell of the flue gas mixing and ash removing device sequentially consists of an inlet cone-shaped reducing shell, a cylindrical shell and an outlet cone-shaped reducing shell which are coaxially arranged along the flowing direction of flue gas, the shell of the flue gas mixing and ash removing device is connected with a vertical round flue of the SCR denitration system through an outlet circular truncated cone-shaped reducing shell and an inlet circular truncated cone-shaped reducing shell, the reducing agent diffusion disc is in an inverted round table shape, the reducing agent diffusion disc is placed in the cylindrical shell and is coaxially arranged with the central axis of the cylindrical shell, the lower end surface of the reducing agent diffusion disc is arranged in parallel with the lower end surface of the cylindrical shell, the axis of the flue gas circulation cylinder is coaxially arranged with the central axis of the shell of the mixing ash removal device, the lower end surface of the axis of the flue gas circulation cylinder is connected with the upper end surface of the reducing agent diffusion disc, the upper end surface of the cylindrical axis core of the mixing device is connected with the post-positioned circulation rotational flow blade, the rear circulation rotational flow blades are vertically and uniformly distributed on the upper end wall surface of the axis of the flue gas circulation cylinder by taking the central axis of the shell of the mixing ash removal device as the axis and along the edge of the circular outer wall of the axis of the flue gas circulation cylinder at a certain eccentric angle, the dust collecting groove is arranged in the center of the axis of the flue gas circulation cylinder and is used for collecting dust with larger particle size in the flue gas of the cement kiln, the dust collecting device is characterized in that a dust discharging pipeline is arranged at the bottom of the dust collecting groove, a dust collecting fan is arranged at the outlet of the dust discharging pipeline, and the outlet of the dust collecting fan is connected with a cigarette ash storage device.
The reducing agent double-fluid spray guns are arranged at the position 2m-5m upstream of the multi-component flue gas circulation mixing ash removal device, the number of the reducing agent double-fluid spray guns is more than or equal to 3, the reducing agent double-fluid spray guns are uniformly distributed in the SCR inlet vertical circular flue by taking the central line of the SCR inlet vertical circular flue as the axis, and the arrangement radius of the reducing agent double-fluid spray guns is smaller than that of the SCR inlet vertical circular flue.
The bypass flue mends the system and comprises hot-blast distribution pipe, nozzle, the external connecting pipe of bypass flue and bypass flue, the hot-blast distribution pipe level is arranged in the upstream position of 0.5m-1m of reductant two-fluid spray gun, the shape of hot-blast distribution pipe is the ring type, the radius of hot-blast distribution pipe is arranged the radius with reductant two-fluid spray gun and is equal, hot-blast distribution pipe leeward side is provided with the nozzle, the quantity of nozzle equals with reductant two-fluid spray gun quantity, the position one-to-one is arranged with reductant two-fluid spray gun to the position of arranging of nozzle, hot-blast distribution pipe links to each other through the export of the external connecting pipe of bypass flue and bypass flue, the entry setting of bypass flue is in the preheater export of rotary kiln and the connection flue middle section position between the exhaust-heat boiler entry, be provided with draught fan and flow control valve in the bypass flue.
The bypass flue mends the system and comprises hot-blast injection apparatus, bypass flue, draught fan and flow control valve, hot-blast injection apparatus level is arranged in reducing agent double-fluid spray gun upstream 0.5m-1 m's position, hot-blast injection apparatus comprises hot-blast distribution pipe, the external connecting pipe of bypass flue and nozzle, the shape of hot-blast distribution pipe is the ring type, the radius of hot-blast distribution pipe and reducing agent double-fluid spray gun arrange the radius and equal, hot-blast distribution pipe lee side is provided with the nozzle, the quantity of nozzle equals with reducing agent double-fluid spray gun quantity, the position one-to-one is arranged with reducing agent double-fluid spray gun to the arrangement position of nozzle, the hot-blast distribution pipe links to each other through the export of the external connecting pipe of bypass flue and bypass flue, the entry setting of bypass flue is in the preheater export of rotary kiln and the exhaust-heat boiler entry between be connected flue middle section position, be provided with draught fan and flow control valve in the bypass flue.
The annular rectifying grating is arranged at a position 2m-5m downstream of the multicomponent flue gas circulation mixing ash removal device and consists of an annular guide plate group and cross guide plates, the annular guide plate group and the cross guide plates are coaxially arranged by taking the central line of a vertical circular flue at an SCR inlet as an axis, the number of the annular guide plates of the annular guide plate group is more than 3, and the annular guide plate groups are assembled through the cross guide plates and are connected with the vertical circular flue at the SCR inlet.
The radius of cylindrical casing is 2 times of the vertical circular flue radius R of SCR entry, the length of cylindrical casing is 1.5R, the radius of export round platform shape reducing casing up end is 1.75R, the radius of export round platform shape reducing casing down end face is 2R, the height of export round platform shape reducing casing is 0.15R, the radius of entry round platform shape reducing casing up end is 2R, the radius of entry round platform shape reducing casing down end face is R, the height of entry round platform shape reducing casing is 0.35R.
The height of the reducing agent diffusion disc is 0.35R, the radius of the lower end face of the reducing agent diffusion disc is larger than 0.5R and smaller than R, and the radius of the upper end face of the reducing agent diffusion disc is 1.5R.
The height of the axis of the smoke circulation cylinder is 0.35R, and the radius of the axis of the smoke circulation cylinder is 1.5R.
The number of the rear circulation swirl vanes is more than 30, and the eccentric angle between the rear circulation swirl vanes and the axis is more than or equal to 30 degrees.
Compared with the prior art, the invention has the following advantages:
1. the structure is simple and reliable, and the generated system resistance is small;
2. the device is suitable for an SCR denitration device with low flue gas temperature and adopting an ammonia water and urea mixed solution double-fluid spray gun as a reducing agent injection system;
3. the uniform mixing efficiency of the reducing agent and the flue gas is greatly improved, and the denitration efficiency of the SCR system is effectively improved;
4. the method has a strong optimization and regulation effect on the uniform distribution of the speed of the flue gas entering the SCR denitration system and the uniform distribution of the concentration of the reducing agent;
5. the dust concentration in the flue gas of the cement kiln is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the installation of a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system according to the patent of the invention.
FIG. 2 is a schematic structural diagram of core components of a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system.
FIG. 3 is a schematic view of a structure of a shell of the flue gas blending and ash removing device according to the present invention.
In the figure: 1. the system comprises a rotary kiln, a preheater 2, a rotary kiln preheater 3, a connecting flue between a preheater outlet and a waste heat boiler inlet of the rotary kiln, a waste heat boiler 4, a bypass flue 5, a draught fan 5.1, a flow control valve 5.2, an SCR inlet vertical circular flue 6, a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system 7.1, a bypass flue heat supplementing system 7.1.1, a hot air distribution pipe 7.1.2, a nozzle 7.1.3, a bypass flue external connecting pipe 7.2, a reducing agent double-fluid spray gun 7.3, a multi-component flue gas circulation blending ash removal device 7.3, a flue gas blending ash removal device shell 7.3.1.1, an inlet circular table-shaped reducing shell 7.3.1.2, a cylindrical shell 7.3.1.3, an outlet circular table-shaped shell 7.3, a reducing agent disc 7.3.3.3.3.3, a circular flow guiding blade 7.3, a circular flow guiding and a cross flow guiding and dust collecting and collecting duct group 7.3.4, a flow guiding plate 6.8, a cross flow guiding and a flow guiding plate.
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
Positional relationships, such as "upper," "lower," "left," "right," "center," "horizontal," "top," and the like, described in this patent are positional relationships based on the orientation shown in the drawings, and are intended only to facilitate the description of the patent and to simplify the description, but not to indicate a particular orientation of an apparatus or device necessary and therefore should not be construed as limiting the patent.
The invention aims to provide a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending dedusting system which is simple, reasonable and reliable in structure, can accelerate the evaporation of reducing agent atomized liquid drops in a flue, can effectively accelerate the uniform mixing of the reducing agent and the flue gas, can effectively improve the uniformity of a flue gas flow field in the flue, can capture dust with larger diameter in the flue gas, and can realize the effects of reducing ammonia escape and improving the denitration efficiency of the cement kiln SCR denitration system.
In order to achieve the purpose, the invention adopts the following technical scheme.
As shown in fig. 1 and 2: a cement kiln SCR denitration reducing agent injection multi-component flue gas circulation mixing ash removal system 7 is arranged in an SCR inlet vertical circular flue 6 between a waste heat boiler 4 and an SCR denitration reactor 8, and the cement kiln SCR denitration reducing agent injection multi-component flue gas circulation mixing ash removal system 7 sequentially comprises a bypass flue heat supplementing system 7.1, a reducing agent double-fluid spray gun 7.2, a multi-component flue gas circulation mixing ash removal device 7.3 and an annular rectifying grating 7.4 along the flowing direction of flue gas.
As shown in fig. 1, 2 and 3: the multi-component flue gas circulation blending ash removal device 7.3 comprises a flue gas blending ash removal device shell 7.3.1, a reducing agent diffusion disc 7.3.2, a flue gas circulation cylindrical axis 7.3.3, a rear circulation rotational flow blade 7.3.4, an ash collection groove 7.3.5 and an ash discharge pipeline 7.3.6, wherein the flue gas blending ash removal device shell 7.3.1 and an SCR inlet vertical circular flue 6 are coaxially arranged, the flue gas blending ash removal device shell 7.3.1 sequentially comprises an inlet circular truncated cone-shaped reducing shell 7.3.1.1, a cylindrical shell 7.3.1.2 and an outlet circular truncated cone-shaped reducing shell 7.3.1.3 which are coaxially arranged along the flow direction of flue gas, the flue gas blending ash removal device shell 7.3.1 is connected with the SCR system vertical circular flue 6 through the outlet circular truncated cone-shaped reducing shell 7.3.1.1 and the inlet circular truncated cone-shaped reducing shell 7.3.1.3.3.3.3 along the flow direction of the flue gas flow, the flue gas blending ash removal device shell 7.3.1 is connected with the SCR system vertical circular truncated cone-shaped cylindrical flue 6, the reducing agent diffusion disc 7.3.2 is coaxially arranged in the central axis of the cylindrical shell 7.3.2, the lower end face of the reducing agent diffusion disc 7.3.2 is arranged in parallel with the lower end face of the cylindrical shell 7.3.1.2, the central axis of the flue gas circulation cylinder 7.3.3 is coaxially arranged with the central axis of the mixing ash removal device shell 7.3.1, the lower end face of the central axis of the flue gas circulation cylinder 7.3.3 is connected with the upper end face of the reducing agent diffusion disc 7.3.2, the upper end face of the mixing device cylindrical shaft core 7.3.3 is connected with a post-positioned circulation swirl vane 7.3.4, the post-positioned swirl vane 7.3.4 takes the central axis of the mixing ash removal device shell 7.3.1 as the shaft center and is vertically and uniformly distributed on the upper end wall face of the central axis of the flue gas circulation cylinder 7.3.3 at a certain eccentric angle along the edge of the circular outer wall of the flue gas circulation shaft center 7.3.3, an ash collecting groove 7.3.5 is arranged in the central axis of the flue gas circulation cylinder shaft center 7.3.3 for collecting dust with larger particle size in cement kiln flue gas, the bottom of the ash collecting groove 7.3.5 is provided with an ash discharge pipe 7.6.6.3, and a dust collection fan 9 is arranged at an outlet of the ash discharge pipeline, and an outlet of the dust collection fan is connected with an ash storage device 10.
FIG. 2 shows: the reducing agent double-fluid spray guns 7.2 are arranged at the position 2m-5m upstream of the multi-component flue gas circulation mixing ash removal device 7.3, the number of the reducing agent double-fluid spray guns 7.2 is more than or equal to 3, the reducing agent double-fluid spray guns 7.2 are uniformly distributed in the SCR inlet vertical circular flue 6 by taking the center line of the SCR inlet vertical circular flue 6 as the axis, and the arrangement radius of the reducing agent double-fluid spray guns 7.2 is smaller than that of the SCR inlet vertical circular flue 6.
As shown in fig. 1 and 2: the bypass flue mends system 7.1 by hot-blast distribution pipe 7.1.1, nozzle 7.1.2, bypass flue external connecting pipe 7.1.3 and bypass flue 5 and constitutes, hot-blast distribution pipe 7.1.1 level is arranged in the position of reducing agent two-fluid spray gun 7.2 upper reaches 0.5m-1m, hot-blast distribution pipe 7.1.1's shape is the ring type, hot-blast distribution pipe 7.1.1's radius and reducing agent two-fluid spray gun 7.2 arrange the radius and equal, hot-blast distribution pipe 7.1.1 leeward side is provided with nozzle 7.1.2, the quantity of nozzle 7.1.2 equals with reducing agent two-fluid spray gun 7.2 quantity, the position one-to-one is arranged with reducing agent two-fluid spray gun 7.2 to the position of arranging of nozzle 7.1.2, hot-blast distribution pipe 7.1.1 links to each other through bypass flue connecting pipe 7.1.3 and bypass flue 5's export, the entry setting of bypass flue 5 is connected 3 middle section positions between the export of preheater 2 of bypass flue 1 of draft fan 1 and exhaust-heat boiler 4 entry, be provided with bypass flue 5.5 flow control valve.
As shown in fig. 2: the annular rectifying grating 7.4 is arranged at the position 2m-5m downstream of the multi-component flue gas circulation blending ash removal device 7.3, the annular rectifying grating 7.4 consists of an annular guide plate group 7.4.1 and cross guide plates 7.4.2, the annular guide plate group 7.4.1 and the cross guide plates 7.4.2 are coaxially arranged by taking the central line of the SCR inlet vertical circular flue 6 as an axis, the number of the annular guide plates of the annular guide plate group 7.4.1 is more than 3, and the annular guide plate groups 7.4.1 are assembled through the cross guide plates 7.4.2 and connected with the SCR inlet vertical circular flue 6.
As shown in fig. 3: the radius of cylindrical casing 7.3.1.2 is 2 times of the vertical circular flue 6 radius R in SCR entry, the length of cylindrical casing 7.3.1.2 is 1.5R, the radius of export round platform shape reducing casing 7.3.1.3 up end is 1.75R, the radius of export round platform shape reducing casing 7.3.1.3 down end is 2R, the height of export round platform shape reducing casing 7.3.1.3 is 0.15R, the radius of entry round platform shape reducing casing 7.3.1.1 up end is 2R, the radius of entry round platform shape reducing casing 7.3.1.1 down end is R, the height of entry round platform shape reducing casing 7.3.1.1 is 0.35R.
As shown in fig. 2: the height of the reducing agent diffusion disc 7.3.2 is 0.35R, the radius of the lower end face of the reducing agent diffusion disc 7.3.2 is larger than 0.5R and smaller than R, and the radius of the upper end face of the reducing agent diffusion disc 7.3.2 is 1.5R.
As shown in fig. 2: the height of the axis 7.3.3 of the smoke circulation cylinder is 0.35R, and the radius of the axis 7.3.2 of the smoke circulation cylinder is 1.5R.
As shown in fig. 2: the number of the rear circulation swirl vanes 7.3.4 is more than 30, and the eccentric angle between the rear circulation swirl vanes 7.3.4 and the axis is more than or equal to 30 degrees.
The embodiment is as follows:
the SCR denitration modification project of the novel dry-process cement production line of the two-line cement kiln with the designed capacity of 2000t/d adopts a medium-temperature medium-dust SCR denitration technology, and the denitration system modification scheme is that a waste heat boiler outlet flue is connected between a connector and a high-temperature fan inlet flue is connected between the connectorsAn SCR denitration reactor is arranged, the cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system 7 is arranged in an SCR inlet vertical circular flue 6 between a waste heat boiler 4 and an SCR denitration reactor 8, the flue gas temperature generated by a rotary kiln 1 after being processed by a flue gas diameter preheater 2 is 350 ℃, the flue gas temperature of the flue gas flowing through the waste heat boiler 4 is 180 ℃, the flue gas flows out of the waste heat boiler 4 and enters the cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system 7, the reducing agent is atomized and injected into the SCR inlet vertical circular flue 6 through 3 double-fluid spray guns 7.2, in order to accelerate the evaporation of atomized liquid drops of the reducing agent, a bypass flue supplementing system 7.1 is arranged at the position 0.5 meter upstream of the double-fluid spray gun 7.2, the bypass flue supplementing system 7.1 introduces the 350 ℃ high-temperature flue gas in a connecting flue between the outlet of the rotary kiln 1 preheater 2 and the inlet of the waste heat boiler 4 into the SCR inlet vertical circular flue 6 through a bypass flue 5, high-temperature flue gas is injected into a mapping area at the upstream of a double-fluid spray gun 7.2 through a wind distribution pipe 7.1.1 and a nozzle 7.1.2 to accelerate the evaporation of reducing agent atomized liquid drops, reducing agent and flue gas mixed gas is diffused in an area between a mixing ash removal device shell 7.3.1 and a flue gas circulation cylindrical axis 7.3.3 under the action of an inlet reducing agent diffusion disc 7.3.2 of a multi-component flue gas circulation mixing ash removal device 7.3, then the reducing agent gas and the flue gas are uniformly mixed under the action of a circulation flow field generated by a rear circulation flow vane 7.3.4, larger dust in the flue gas is collected by an ash collection groove 7.3.5 arranged in the center 7.3.3 of the flue gas circulation cylindrical axis during mixing, the collected dust is transported to a soot storage device 10 through an ash discharge pipeline 7.3.6 and a fan 9, the flue gas and the reducing agent after dust collection and ash removal are uniformly mixed by the multi-component flue gas circulation ash removal mixing ash removal device 7.3 and then pass through an annular whole device The flow grid 7.4 eliminates the bias flow eddy current phenomenon existing in the flue gas, further improves the flow field uniformity of the mixed flue gas, and finally the uniformly mixed flue gas and the reducing agent gas enter the SCR denitration reactor for denitration reaction. The cement kiln SCR denitration reducing agent is adopted to spray multi-component flue gas circulation mixing dedusting system and the front and rear SCR reactor denitration efficiency are subjected to field actual measurement contrast test on the cement kiln SCR denitration modification project of the embodiment, the actual measurement results show that the SCR reactor denitration efficiency is improvedThe speed distribution uniformity is optimized from Cv =48.5% to Cv =14.5, the denitration efficiency is improved by 11.2% to 86.4%, and the ammonia escape rate is 15.3mg/Nm 3 Down to 3.2mg/Nm 3 And no obvious dust deposition phenomenon exists in the flue of the reactor. After the improvement, all technical indexes of the SCR reactor are obviously optimized and improved.
While the invention has been described in detail with reference to one embodiment thereof, the foregoing description is only illustrative of the preferred embodiment of the invention and should not be construed as limiting the scope of the invention. All such modifications, equivalents and variations as may be made without departing from the scope of the claims are intended to be included within the scope of the following claims.
Claims (9)
1. The utility model provides a cement kiln SCR denitration reductant sprays multicomponent flue gas circulation mixing deashing system which characterized in that: the cement kiln SCR denitration reducing agent injection multi-component flue gas circulation mixing and dedusting system is placed in an SCR inlet vertical circular flue between a waste heat boiler and an SCR denitration reactor, and sequentially consists of a bypass flue heat supplementing system, a reducing agent double-fluid spray gun, a multi-component flue gas circulation mixing and dedusting device and an annular rectifying grid along the flowing direction of flue gas.
2. The cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system as claimed in claim 1, is characterized in that: the multi-component flue gas circulation blending ash removal device consists of a flue gas blending ash removal device shell, a reducing agent diffusion disc, a flue gas circulation cylindrical axis, a post-positioned circulation rotational flow blade, an ash collection groove and an ash discharge pipeline, the shell of the flue gas mixing and ash removing device is coaxially arranged with the vertical round flue of the SCR inlet, the shell of the flue gas mixing and ash removing device sequentially consists of an inlet circular truncated cone-shaped reducing shell, a cylindrical shell and an outlet circular truncated cone-shaped reducing shell which are coaxially arranged along the flowing direction of flue gas, the shell of the flue gas mixing and ash removing device is connected with a vertical round flue of the SCR denitration system through an outlet circular truncated cone-shaped reducing shell and an inlet circular truncated cone-shaped reducing shell, the reducing agent diffusion disc is in an inverted round table shape, the reducing agent diffusion disc is placed in the cylindrical shell and is coaxially arranged with the central axis of the cylindrical shell, the lower end surface of the reducing agent diffusion disc is arranged in parallel with the lower end surface of the cylindrical shell, the axis of the flue gas circulation cylinder is coaxially arranged with the central axis of the shell of the mixing ash removal device, the lower end surface of the axis of the flue gas circulation cylinder is connected with the upper end surface of the reducing agent diffusion disc, the upper end surface of the cylindrical axis core of the mixing device is connected with the post-positioned circulation rotational flow blade, the rear circular flow swirling vanes are vertically and uniformly distributed on the upper end wall surface of the axis of the flue gas circular flow cylinder by taking the central axis of the shell of the mixing and ash removing device as the axis and along the edge of the circular outer wall of the axis of the flue gas circular flow cylinder at a certain eccentric angle, the dust collecting groove is arranged in the center of the axis of the flue gas circular flow cylinder and is used for collecting dust with larger particle size in the flue gas of the cement kiln, the dust collecting device is characterized in that an ash discharge pipeline is arranged at the bottom of the ash collecting groove, a dust collecting fan is arranged at the outlet of the ash discharge pipeline, and the outlet of the dust collecting fan is connected with the ash storage device.
3. The cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system as claimed in claim 1, is characterized in that: the reducing agent double-fluid spray guns are arranged at the position 2m-5m upstream of the multi-component flue gas circulation mixing ash removal device, the number of the reducing agent double-fluid spray guns is more than or equal to 3, the reducing agent double-fluid spray guns are uniformly distributed in the SCR inlet vertical circular flue by taking the central line of the SCR inlet vertical circular flue as the axis, and the arrangement radius of the reducing agent double-fluid spray guns is smaller than that of the SCR inlet vertical circular flue.
4. The cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system as claimed in claim 1, is characterized in that: the bypass flue mends the system and comprises hot-blast distribution pipe, nozzle, the external connecting pipe of bypass flue and bypass flue, hot-blast distribution pipe level is arranged in the upstream position of 0.5m-1m of reductant two-fluid spray gun, the shape of hot-blast distribution pipe is the ring type, the radius of hot-blast distribution pipe and reductant two-fluid spray gun arrange the radius and equal, hot-blast distribution pipe leeward side is provided with the nozzle, the quantity of nozzle equals with reductant two-fluid spray gun quantity, the position of arranging of nozzle arranges the position one-to-one with reductant two-fluid spray gun, hot-blast distribution pipe links to each other through the export of the external connecting pipe of bypass flue with bypass flue, the entry setting of bypass flue is in the preheater export of rotary kiln and the connection flue middle section position between the exhaust-heat boiler entry, be provided with draught fan and flow control valve in the bypass flue.
5. The cement kiln SCR denitration reducing agent injection multi-component flue gas circulation blending ash removal system as claimed in claim 1, is characterized in that: the annular rectifying grating is arranged at the position 2m-5m downstream of the multi-component flue gas circulation blending ash removal device and consists of an annular guide plate group and cross guide plates, the annular guide plate group and the cross guide plates are coaxially arranged by taking the central line of the vertical circular flue at the SCR inlet as an axis, the number of the annular guide plates of the annular guide plate group is more than 3, and the annular guide plate groups are assembled through the cross guide plates and connected with the vertical circular flue at the SCR inlet.
6. The multi-component flue gas circular flow blending ash removal device of claim 2, characterized in that: the radius of cylindrical casing is 2 times of the vertical circular flue radius R of SCR entry, the length of cylindrical casing is 1.5R, the radius of export round platform shape reducing casing up end is 1.75R, the radius of export round platform shape reducing casing down end is 2R, the height of export round platform shape reducing casing is 0.15R, the radius of entry round platform shape reducing casing up end is 2R, the radius of entry round platform shape reducing casing down end is R, the height of entry round platform shape reducing casing is 0.35R.
7. The multi-component flue gas circular flow blending ash removal device of claim 2, characterized in that: the height of the reducing agent diffusion disc is 0.35R, the radius of the lower end face of the reducing agent diffusion disc is larger than 0.5R and smaller than R, and the radius of the upper end face of the reducing agent diffusion disc is 1.5R.
8. The multi-component flue gas circular flow blending ash removal device of claim 2, characterized in that: the height of the axis of the smoke circulation cylinder is 0.35R, and the radius of the axis of the smoke circulation cylinder is 1.5R.
9. The multi-component flue gas circular-flow blending ash removal device of claim 2, wherein: the number of the rear circular flow swirl blades is more than 30, and the eccentric angle between the rear circular flow swirl blades and the axis is more than or equal to 30 degrees.
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| CN202211232364.3A CN115364666A (en) | 2022-10-10 | 2022-10-10 | Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln |
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| CN202211232364.3A CN115364666A (en) | 2022-10-10 | 2022-10-10 | Circulating mixing and ash removing system for injecting multi-component flue gas by SCR (Selective catalytic reduction) denitration reducing agent of cement kiln |
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