CN111013348A - Dust and nitrate integrated system and method suitable for multi-dust section in cement kiln - Google Patents
Dust and nitrate integrated system and method suitable for multi-dust section in cement kiln Download PDFInfo
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- CN111013348A CN111013348A CN201911335786.1A CN201911335786A CN111013348A CN 111013348 A CN111013348 A CN 111013348A CN 201911335786 A CN201911335786 A CN 201911335786A CN 111013348 A CN111013348 A CN 111013348A
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- dust
- integrated
- cement kiln
- nitrate
- nitrite
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- 239000000428 dust Substances 0.000 title claims abstract description 193
- 239000004568 cement Substances 0.000 title claims abstract description 36
- 229910002651 NO3 Inorganic materials 0.000 title claims abstract description 30
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 230000010354 integration Effects 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 36
- 239000004744 fabric Substances 0.000 claims description 28
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 20
- 239000003054 catalyst Substances 0.000 claims description 16
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 11
- 239000000779 smoke Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000003795 desorption Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a dust and nitrate integrated system and a method suitable for a multi-dust section in a cement kiln. The invention realizes integration and cooperative processing; the original system is simplified, the control is reduced, and the fault points are reduced; the difficulty that each cement plant is compact and cannot be provided with new equipment is overcome; reduce flue gas return circuit, smooth and easy air current reduces system resistance.
Description
Technical Field
The invention is used in the technical field of air pollution control in cement production, and particularly relates to a dust and nitrate integrated system and a dust and nitrate integrated method suitable for a dusty section in a cement kiln.
Background
In the aspect of air pollution control in the cement industry at present, the treatment of main pollutants dust and NOx is basically split equipment and an independent system, and the defects exist: the system is large, distributed control is realized, and a plurality of fault points are realized; the split equipment occupies a large area and is difficult to arrange; the pre-dedusting equipment and the SCR denitration system are newly added equipment; the flue gas circulation is not smooth, the system resistance is large, and the energy consumption is high.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a dust and cement integrated system and method suitable for a multi-dust section in a cement kiln.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a dust and nitrate integrated system suitable for a multi-dust section in a cement kiln, which comprises an SNCR (selective non-catalytic reduction) denitration system, a dust and nitrate integrated electric bag composite dust remover, a tail exhaust fan and a chimney.
In the scheme, the dust and nitrite integrated electric bag composite dust remover is arranged behind the smoke outlet of the multistage preheater and in front of the high-temperature fan.
In the above scheme, the dust collector further comprises a dry dust collector, and the dry dust collector is arranged between the dust and nitrite integrated electric-bag composite dust collector and the tail exhaust fan.
In the above scheme, a high-temperature fan is arranged between the dust and nitrite integrated electric-bag composite dust remover and the dry dust remover.
In the above scheme, the dust and nitrite integrated electric-bag composite dust remover comprises a dust removing area, wherein the dust removing area sequentially comprises at least one electrostatic dust removing area and a cloth dust removing area from left to right; and a catalyst area is arranged at the top of the cloth dust removal area and used for arranging a catalyst.
In the scheme, the left side of the dust removing area is provided with an air inlet, and the top of the right side of the dust removing area is provided with an air outlet; a plurality of air flow distribution plates are disposed within the air inlet 54.
In the scheme, ash hoppers are arranged below each electrostatic dust removal area and each cloth dust removal area; the filter cloth in the cloth dust removing area is made of metal filter materials or common synthetic filter materials and glass fibers.
The embodiment of the invention also provides a dust and nitrate integrated treatment method suitable for a multi-dust section in a cement kiln, which comprises the following steps: in the cement production process, flue gas generated by the rotary kiln passes through an SNCR (selective non-catalytic reduction) denitration system to remove partial NOx, a denitration reducing agent is added into the flue gas and then enters the dust and nitrate integrated electric bag composite dust remover to realize gradual dust removal and deep NOx removal, and the flue gas is introduced into a chimney to be discharged under the action of a tail exhaust fan.
In the above scheme, the method further comprises: the flue gas after NOx removal through the dust and nitrate integrated electric bag composite dust remover is introduced into the dry type dust remover through the high-temperature fan, and the clean gas after dust deep removal through the dry type dust remover is introduced into the chimney to be discharged under the action of the tail exhaust fan.
In the above scheme, after the flue gas enters the integrative electric bag composite dust collector of dirt nitre, through the static dust removal district desorption part particulate matter, further desorption dust through the cloth dust removal district, at last, through cloth dust removal district upper portion catalyst layer desorption NOx after, discharge from upper portion, denitration reductant spout the mouth and set up at the integrative electric bag composite dust collector entry flue of dirt nitre.
Compared with the prior art, the invention realizes integration and cooperative processing; the original system is simplified, the control is reduced, and the fault points are reduced; the difficulty that each cement plant is compact and cannot be provided with new equipment is overcome; reduce flue gas return circuit, smooth and easy air current reduces system resistance.
Drawings
FIG. 1 is a schematic structural diagram of a dust and nitrate integrated system suitable for a multi-dust section in a cement kiln for a low-temperature low-dust section according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a dust and nitrate integrated system suitable for a multi-dust section in a cement kiln for a medium-temperature high-dust section according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a dust and nitrite integrated electric-bag composite dust remover in a dust and nitrite integrated system suitable for a multi-dust section in a cement kiln according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a dust and nitrate integrated system suitable for a multi-dust section in a cement kiln, which comprises an SNCR (selective non-catalytic reduction) denitration system 4, a dust and nitrate integrated electric bag composite dust remover 5, a tail exhaust fan 6 and a chimney 7, wherein a rotary kiln 1 is sequentially connected with a decomposing furnace 2 and a multi-stage preheater 3, the SNCR denitration system 4 is connected with the decomposing furnace 2, and a smoke outlet of the multi-stage preheater 3 is sequentially connected with the dust and nitrate integrated electric bag composite dust remover 5, the tail exhaust fan 6 and the chimney 7.
As shown in figure 1, when the invention is used for treating low-temperature dust sections (smoke temperature is less than 200 ℃, and dust concentration is less than 20mg/Nm3) in a cement kiln, the invention comprises an SNCR (selective non catalytic reduction) denitration system 4, a dust and nitre integrated electric bag composite dust remover 5, a tail exhaust fan 6 and a chimney 7, wherein a rotary kiln 1 is sequentially connected with a decomposing furnace 2 and a multi-stage preheater 3, the SNCR denitration system 4 is connected with the decomposing furnace 2, and a smoke outlet of the multi-stage preheater 3 is sequentially connected with the dust and nitre integrated electric bag composite dust remover 5, the tail exhaust fan 6 and the chimney 7.
The dust and nitrate integrated electric bag composite dust remover 5 is arranged between a smoke outlet of the multi-stage preheater 3 and the high-temperature fan 8.
As shown in fig. 3, the dust and nitrite integrated electric-bag composite dust remover 5 comprises a dust removing area, and the dust removing area comprises at least one electrostatic dust removing area 51 and a cloth dust removing area 52 in sequence from left to right; the catalyst area 521 is arranged at the top of the cloth dust removing area 52 and used for arranging low-temperature catalyst.
The left side of dust removal district sets up air inlet 54, the right side top sets up gas outlet 55, like this, adopts the side to admit air and go up the structure of giving vent to anger, makes the flue gas that gets into in the integrative electric bag composite dust remover of dirt nitre rationally distribute the gas, makes the reductant intensive mixing for the denitration simultaneously, goes up the structure of giving vent to anger and is favorable to whole technology butt joint, also can avoid denitration district catalyst to erode.
An ash hopper 56 is provided under each of the electrostatic precipitator area 51 and the cloth precipitator area 52.
The filter cloth in the cloth dust removal area 52 is made of metal filter material.
A plurality of layers of air flow distribution plates 541 are arranged in the air inlet 54, and the catalyst area 521 is positioned in the air outlet 55.
As shown in fig. 2, when the invention is used for treating high-temperature dust sections (the smoke temperature is about 300 ℃, and the dust concentration is about 80-100 g/Nm3) in a cement kiln, the invention comprises an SNCR (selective non catalytic reduction) denitration system 4, a dust and nitre integrated electric bag composite dust remover 5, a tail exhaust fan 6 and a chimney 7, wherein a rotary kiln 1 is sequentially connected with a decomposing furnace 2 and a multi-stage preheater 3, the SNCR denitration system 4 is connected with the decomposing furnace 2, and a smoke outlet of the multi-stage preheater 3 is sequentially connected with the dust and nitre integrated electric bag composite dust remover 5, the tail exhaust fan 6 and the chimney 7.
As shown in fig. 3, the dust and nitrite integrated electric-bag composite dust remover 5 comprises a dust removing area, and at least one electrostatic dust removing area 51 and a cloth dust removing area 52 are arranged in the dust removing area from left to right; the catalyst area 521 is arranged at the top of the cloth dust removing area 52 for arranging high-temperature catalyst.
The left side in dust removal district sets up air inlet 54, the right side top sets up gas outlet 55, like this, adopts the side to admit air and go up the structure of giving vent to anger, makes the reasonable portion gas of flue gas that gets into in the integrative electric bag composite dust remover of dirt nitre, makes the reductant intensive mixing for the denitration simultaneously, and the structure of giving vent to anger is favorable to whole technology butt joint, also can avoid denitration district catalyst to erode.
A plurality of layers of air flow distribution plates 541 are arranged in the air inlet 54, and the catalyst area 521 is positioned in the air outlet 55.
The filter cloth in the cloth dust removal area 52 is made of common synthetic filter materials and glass fibers.
An ash hopper 56 is provided under each of the electrostatic precipitator area 51 and the cloth precipitator area 52.
For the high-temperature dust section, the thermal expansion of the joint of each component of the dust and nitrite integrated electric bag composite dust collector 5 should be considered.
Further, the dust collector also comprises a dry dust collector 9, and the dry dust collector 9 is arranged between the dust and nitrite integrated electric-bag composite dust collector 5 and the tail exhaust fan 6.
And a high-temperature fan 8 is arranged between the dust and nitrate integrated electric-bag composite dust remover 5 and the dry dust remover 9.
The invention provides a dust and nitrate integrated treatment method suitable for a multi-dust section in a cement kiln, which comprises the following steps: in the cement production process, after flue gas generated by the rotary kiln 1 passes through an SNCR (selective non-catalytic reduction) denitration system, a denitration reducing agent is added into the flue gas and then enters the dust and nitrate integrated electric bag composite dust remover 5 to remove NOx, and the flue gas after NOx removal is introduced into a chimney 7 to be discharged under the action of a tail exhaust fan 6.
When the invention is used for treating low-temperature dust sections in a cement kiln (the smoke temperature is less than 200 ℃, and the dust concentration is less than 20mg/Nm & lt 3 & gt), in the cement production process, smoke generated by the rotary kiln 1 passes through an SNCR denitration system, enters the dust and nitrate integrated electric bag composite dust remover 5 to remove NOx, and the smoke after NOx removal is introduced into a chimney 7 to be discharged under the action of the tail exhaust fan 6.
After entering the dust and nitrite integrated electric bag composite dust remover 5 from the lateral gas inlet 54, the flue gas passes through the electrostatic dust removal area 51 to remove a part of particulate matters, further removes dust through the cloth dust removal area 52, and finally, after removing nitrogen oxides through the low-temperature catalyst on the upper part of the cloth dust removal area 52, the clean gas is discharged from the gas outlet 55 on the upper part.
When the high-temperature dust section in the cement kiln is treated by the method, in the cement production process, flue gas generated by the rotary kiln 1 passes through an SNCR (selective non-catalytic reduction) denitration system, a denitration reducing agent is added into the flue gas and then enters the dust and nitrate integrated electric bag composite dust remover 5 to remove NOx, the flue gas after NOx removal is introduced into the dry dust remover 9 through the high-temperature fan 8, and the flue gas after removal through the dry dust remover 9 is introduced into the chimney 7 under the action of the tail exhaust fan 6 to be discharged.
After entering the dust and nitrite integrated electric bag composite dust remover 5 from the lateral air inlet 54, the flue gas passes through the electrostatic dust removal area 51 to remove a part of particulate matters, further removes dust through the cloth dust removal area 52, and finally, after removing nitrogen oxides through the high-temperature catalyst on the upper part of the cloth dust removal area 52, the clean gas is discharged from the air outlet 55 on the upper part.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. The utility model provides a dirt nitre integration system of many dirt sections in being fit for cement kiln, its characterized in that, including SNCR denitration system, the integrative electric bag composite dust remover of dirt nitre, tail exhaust fan and chimney, the rotary kiln is connected with dore furnace, multi-stage pre-heater in proper order, SNCR denitration system is connected with dore furnace, multi-stage pre-heater's outlet flue connects gradually integrative electric bag composite dust remover of dirt nitre, tail exhaust fan and chimney.
2. The dust and nitrite integrated system suitable for the multi-dust section in the cement kiln as claimed in claim 1, wherein the dust and nitrite integrated electric bag compound dust remover is arranged behind the smoke outlet of the multi-stage preheater and in front of the high temperature fan.
3. The integrated dust and nitrite system suitable for the multi-dust section of the cement kiln as recited in claim 1, further comprising a dry dust collector, wherein the dry dust collector is arranged between the integrated dust and nitrite electric bag composite dust collector and the tail exhaust fan.
4. The dust and nitrite integrated system suitable for the multi-dust section in the cement kiln as claimed in claim 3, wherein a high temperature fan is arranged between the dust and nitrite integrated electric bag compound dust collector and the dry dust collector.
5. The integrated dust and nitrite system suitable for the multi-dust section in the cement kiln as claimed in any one of claims 1 to 4, wherein the integrated dust and nitrite electric bag compound dust remover comprises a dust removing area, and the dust removing area comprises at least one electrostatic dust removing area and a cloth dust removing area in sequence from left to right; and a catalyst area is arranged at the top of the cloth dust removal area and used for arranging a catalyst.
6. The dust and nitrate integrated system suitable for the multi-dust section in the cement kiln as claimed in claim 5, wherein the dedusting area is provided with an air inlet at the left side and an air outlet at the top of the right side; a plurality of air flow distribution plates are disposed within the air inlet 54.
7. The dust and nitrate integrated system suitable for the multi-dust section in the cement kiln as claimed in claim 6, wherein an ash hopper is arranged below each of the electrostatic dust removing area and the cloth dust removing area; the filter cloth in the cloth dust removing area is made of metal filter materials or common synthetic filter materials and glass fibers.
8. The integrated dust and nitrate treatment method suitable for the multi-dust section in the cement kiln is characterized by comprising the following steps: in the cement production process, flue gas generated by the rotary kiln passes through an SNCR (selective non-catalytic reduction) denitration system to remove partial NOx, a denitration reducing agent is added into the flue gas and then enters the dust and nitrate integrated electric bag composite dust remover to realize gradual dust removal and deep NOx removal, and the flue gas is introduced into a chimney to be discharged under the action of a tail exhaust fan.
9. The integrated dust and nitrate treatment method suitable for the dusty segment in the cement kiln as claimed in claim 7, characterized in that the method further comprises: the flue gas after NOx removal through the dust and nitrate integrated electric bag composite dust remover is introduced into the dry type dust remover through the high-temperature fan, and the clean gas after dust deep removal through the dry type dust remover is introduced into the chimney to be discharged under the action of the tail exhaust fan.
10. The integrated dust and nitrate treatment method suitable for the multi-dust section in the cement kiln as claimed in claim 7 or 8, wherein the flue gas enters the dust and nitrate integrated electric bag composite dust remover, part of particulate matters are removed through the electrostatic dust removal region, dust is further removed through the cloth dust removal region, finally, NOx is removed through a catalyst layer on the upper part of the cloth dust removal region, and then the flue gas is discharged from the upper part, and the denitration reducing agent injection port is arranged in the flue of the dust and nitrate integrated electric bag composite dust remover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911335786.1A CN111013348A (en) | 2019-12-23 | 2019-12-23 | Dust and nitrate integrated system and method suitable for multi-dust section in cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911335786.1A CN111013348A (en) | 2019-12-23 | 2019-12-23 | Dust and nitrate integrated system and method suitable for multi-dust section in cement kiln |
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| CN111013348A true CN111013348A (en) | 2020-04-17 |
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| CN201911335786.1A Pending CN111013348A (en) | 2019-12-23 | 2019-12-23 | Dust and nitrate integrated system and method suitable for multi-dust section in cement kiln |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09243050A (en) * | 1996-03-01 | 1997-09-16 | Kawasaki Heavy Ind Ltd | Exhaust gas treatment method and apparatus |
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| CN211725289U (en) * | 2019-12-23 | 2020-10-23 | 西安西矿环保科技有限公司 | Dust and nitrate integrated system suitable for multi-dust section in cement kiln |
-
2019
- 2019-12-23 CN CN201911335786.1A patent/CN111013348A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09243050A (en) * | 1996-03-01 | 1997-09-16 | Kawasaki Heavy Ind Ltd | Exhaust gas treatment method and apparatus |
| CN104772014A (en) * | 2015-04-10 | 2015-07-15 | 无锡华光新动力环保科技股份有限公司 | Combined denitration device for flue gas of cement rotary kiln and denitration technology for flue gas |
| CN204619708U (en) * | 2015-04-10 | 2015-09-09 | 无锡华光新动力环保科技股份有限公司 | A kind of cement rotary kiln kiln gas combined denitration device |
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| CN110064301A (en) * | 2019-05-24 | 2019-07-30 | 浙江天地环保科技有限公司 | One kind being used for cement kiln end exhaust gas dust nitrogen oxides cooperation-removal system and method |
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Application publication date: 20200417 |