CN114653182B - Energy-saving efficient composite denitration device - Google Patents
Energy-saving efficient composite denitration device Download PDFInfo
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- CN114653182B CN114653182B CN202210311660.6A CN202210311660A CN114653182B CN 114653182 B CN114653182 B CN 114653182B CN 202210311660 A CN202210311660 A CN 202210311660A CN 114653182 B CN114653182 B CN 114653182B
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- 239000002131 composite material Substances 0.000 title claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000003546 flue gas Substances 0.000 claims abstract description 130
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 23
- 239000007921 spray Substances 0.000 claims abstract description 23
- 239000003345 natural gas Substances 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000000265 homogenisation Methods 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims description 67
- 238000001514 detection method Methods 0.000 claims description 39
- 239000003795 chemical substances by application Substances 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 34
- 239000003638 chemical reducing agent Substances 0.000 claims description 28
- 239000003054 catalyst Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000003570 air Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 238000009529 body temperature measurement Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/10—Conditioning the gas to be cleaned
-
- 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
- B01D53/346—Controlling the process
-
- 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
- B01D53/79—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
-
- 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
- B01D53/8696—Controlling the catalytic process
-
- 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
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The application discloses energy-saving efficient composite denitration equipment, and relates to the field of environmental protection equipment. The denitration device comprises a flue gas inlet system and a high-efficiency heat exchange system; the high-efficiency heat exchange system is connected with the three paths of processing systems for processing respectively and then is gathered into an SNCR denitration A tower; the three processing systems are respectively as follows: a primary flue gas system, a secondary flue gas system and a tertiary flue gas system; the gas of the first-stage flue gas system and the gas of the natural gas inlet system are connected in parallel and then are gathered into an SNCR denitration A tower; the secondary flue gas system and the tertiary flue gas system are sprayed by a three-fluid spray gun system and respectively enter an SNCR denitration A tower; the SNCR denitration A tower is connected with the SCR denitration B tower; the application realizes energy conservation and emission reduction and NO by combining SNCR with a plurality of technologies such as SCR composite denitration, high-efficiency heat exchanger, high-efficiency homogenization of a flue gas temperature field, high-efficiency homogenization of a flue gas concentration field, high-efficiency acquisition and control of flue gas parameter inlet and outlet X And the purpose of ammonia emission up to standard.
Description
Technical Field
The application relates to the field of flue gas denitration, in particular to energy-saving and efficient composite denitration equipment.
Background
Currently, three major environmental problems facing the world include: greenhouse effect, acidic precipitation and ozone layer destruction; of the contaminants responsible for the above-mentioned atmospheric environmental problems, NO X Occupies a very important proportion and is enough to have a great influence on the nature. NO (NO) X The aqueous solution is not only the basis of the nitric acid type acid rain, but also one of the main substances forming photochemical smog and destroying the ozone layer, has strong toxicity, and has great harm to human bodies, environment and ecology and great damage to society and economy.
Denitration of flue gas means that generated NO X Reduction to N 2 Thereby removing NO in the flue gas X The flue gas denitration technology mainly comprises a dry methodAnd wet methods. The dry denitration process comprises a selective non-catalytic reduction SNCR and a selective catalytic reduction SCR; the wet denitration process is mainly an ozone oxidation absorption method. Compared with the wet method, the dry method has the main advantages that: low basic investment, simple equipment and technological process, and NO removal X The efficiency is also higher, no waste water or waste is treated, and secondary pollution is not easy to cause. In a plurality of denitration processes, the selective catalytic reduction SCR has the highest denitration efficiency which can reach 80% -90%, and has become the most mature denitration technology at present.
At present, more strict NO is formulated in a plurality of provinces and regions in China X The emission standard requires that the denitration efficiency is 97% -99.5%, the requirement on ammonia escape index is more and more strict, and the traditional denitration technology can not meet the new standard.
Disclosure of Invention
In order to solve the technical problems, the application provides energy-saving efficient composite denitration equipment, and the energy-saving efficient commercial denitration technology is further optimized, and the equipment realizes energy saving, emission reduction, NO by combining multiple technologies such as SNCR and SCR composite denitration, efficient heat exchanger, efficient homogenization of a flue gas temperature field, efficient homogenization of a flue gas concentration field, efficient acquisition and control of flue gas parameter inlet and outlet and the like X And the purpose of ammonia emission up to standard.
The technical problems of the application are realized by the following technical scheme: an energy-saving high-efficiency composite denitration device comprises a smoke gas inlet system and a high-efficiency heat exchange system which are sequentially connected; the high-efficiency heat exchange system is connected with the three paths of processing systems for processing respectively and then is gathered into an SNCR denitration A tower; the SNCR denitration A tower is connected with the SCR denitration B tower, and the flue gas of the SCR denitration B tower enters a smoke exhaust system after being treated by the efficient heat exchange system;
the three processing systems are respectively as follows: a primary flue gas system, a secondary flue gas system and a tertiary flue gas system; the gas of the primary flue gas system and the gas of the natural gas inlet system are connected in parallel and then are gathered into an SNCR denitration A tower; the secondary flue gas system and the tertiary flue gas system are sprayed and treated by a three-fluid spray gun system and respectively enter an SNCR denitration A tower.
Further, the SNCR denitration A tower sequentially comprises a combustion zone, an SNCR reaction zone and a mixed third zone along the airflow direction;
the combustion zone is a combustion space of primary flue gas, air and natural gas;
the SNCR reaction zone comprises an annular A cavity communicated with the secondary flue gas system, and a cyclone sheet is arranged in the annular A cavity;
the mixed third zone comprises an annular B cavity communicated with the three-stage flue gas system, and the annular B cavity is communicated with a reaction space of the mixed third zone through a three-stage flue gas outlet; and the mixed third area is connected with a high-temperature flue gas pipeline.
Further, the SCR denitration B tower sequentially comprises a mixed fourth zone, a mixed fifth zone and an SCR reaction zone along the airflow direction; an umbrella-shaped outlet is arranged in the mixing fourth zone, and a homogenization A layer is arranged at the bottom of the mixing fourth zone; the bottom of the mixing fifth zone is provided with a homogenization B layer.
Further, the SCR reaction zone includes a multi-layered reaction space including a first layer of catalyst, a C space, a second layer of catalyst, a D space, an E space, a third layer of catalyst, an F space, a spare layer of catalyst, and a G space in this order.
Further, the three-fluid spray gun system comprises a compressed air system, a reducing agent rough regulating system and a reducing agent fine regulating system which are mutually connected in parallel; the three-fluid spray gun system terminal is provided with a three-fluid spray gun.
Further, the compressed air system comprises a compressed air pipeline, and an air pressure manual ball valve, an air source triple piece and a manual adjusting needle valve are sequentially arranged on the compressed air pipeline along the air flow direction.
Further, the reducing agent coarse adjustment system comprises a pin removal agent large barrel, an ammonia supplementing pump and a pin removal agent small barrel which are sequentially connected, wherein the pin removal agent small barrel is connected with an ammonia spraying pump and a pin removal agent A pipeline, and the terminal of the pin removal agent A pipeline is converged into a three-fluid spray gun; the reducing agent fine adjustment system comprises an ammonia spraying B pump connected with a pin removing agent small barrel, wherein the ammonia spraying B pump is connected with a pin removing agent B pipeline, and the terminal end of the pin removing agent B pipeline is converged into a three-fluid spray gun.
Further, a gas main valve, a manual gas valve, a gas electromagnetic valve, an air-fuel ratio valve and a heating burner are sequentially arranged on a gas path of the natural gas inlet system, and the heating burner is arranged at the gas inlet end of the SNCR denitration A tower; the primary flue gas system comprises a primary pipeline for conveying primary flue gas and an air mixing pipeline, and a proportional regulating valve is arranged on the primary pipeline; the air mixing pipeline is sequentially provided with a high-pressure air blower, a manual adjusting valve and a proportional adjusting valve, and the tail end of the air mixing pipeline is connected to the heating burner.
Further, a smoke inlet detection port and a smoke inlet three-way detection port are arranged on the smoke inlet system; the efficient heat exchange system comprises a flue gas distribution B pipeline, heat exchange equipment and a flue gas distribution A pipeline, wherein the flue gas distribution B pipeline is communicated with a flue gas inlet system, the flue gas distribution A pipeline is communicated with a main pipeline, and the main pipeline is connected with three paths of treatment systems.
Further, the smoke exhaust system comprises a smoke exhaust pipeline arranged at the rear of the efficient heat exchange system, and a smoke exhaust three-way detection port and a smoke exhaust outlet detection port are arranged on the smoke exhaust pipeline.
In summary, the application has the following beneficial effects:
the composite denitration device has the advantages of remarkable energy saving, high denitration efficiency, low ammonia escape, convenient detection, no ladder and platform, automatic collection and emission of condensed water, more environment-friendly zero escape of flue gas and good installation, maintenance and detection manufacturability.
Drawings
FIG. 1 is a schematic view of the process of the apparatus of the present application;
FIG. 2 is a schematic diagram of the flue gas flow direction (open single arrow) and the reductant flow direction (solid double arrow) prior to catalyst introduction;
FIG. 3 is a schematic diagram of the catalyzed flue gas flow direction (open double arrow), natural gas flow direction (open triple arrow) and condensate flow direction (solid triple arrow);
fig. 4 is a schematic diagram of the structure of an SNCR multifunctional denitration a tower;
FIG. 5 is a schematic diagram of the structure of an SCR multifunctional denitration B tower, a flue gas inlet system, a smoke exhaust system and a high-efficiency heat exchange system;
FIG. 6 is a schematic diagram of a three fluid spray gun system.
Reference numerals illustrate:
1. a flue gas inlet system; 101. a flue gas inlet interface; 102. a smoke inlet detection port; 103. smoke enters the three-party detection port;
2. an efficient heat exchange system; 201. a flue gas distribution pipeline A; 202. a heat exchange device; 203. a flue gas distribution B pipeline; 204. a condensed water C pipe; 205. a main pipe;
3. a smoke exhaust system; 301. a smoke exhaust duct; 302. a smoke discharging three-way detection port; 303. a smoke outlet detection port; 304. a smoke exhaust umbrella cover;
4. a primary flue gas system; 401. a primary pipeline; 402. a proportional control valve; 403. a high pressure blower; 404. manually adjusting a valve; 405. a proportional control valve;
5. a secondary flue gas system; 501. a secondary conduit; 502. a proportional control valve;
6. a three-stage flue gas system; 601. a tertiary pipeline; 602. manually adjusting the three valves;
7. a natural gas intake system; 701. a gas main valve; 702. a manual gas valve; 703. a gas solenoid valve; 704. an air-fuel ratio example valve; 705. heating the burner;
8. SNCR denitration A tower; 801. a combustion zone; 802. an SNCR reaction zone; 803. mixing the third zone; 804. an annular A cavity; 805. an annular B cavity; 806. swirl plates; 807. a secondary flue gas outlet; 808. SNCR smoke temperature detection port; 809. a third-stage flue gas outlet; 810. heat preservation layer A; 811. a high temperature flue gas duct; 812. a condensed water A pipe;
9. an SCR denitration B tower;
901. mixing the fourth zone; 9011. homogenizing the layer A; 9012. an umbrella outlet; 9013. a standby detection port A; 9014. a condensed water B pipe;
902. mixing the fifth zone; 9021. homogenizing the layer B; 9022. a catalyst initial smoke temperature detection port;
903. an SCR reaction zone; 9031. a first layer of catalyst; 9032. a second layer of catalyst; 9033. a third layer catalyst; 9034. a backup layer catalyst; 9035. heat preservation layer B; 9036. a standby detection port C; 9037. c space; 9038. a standby detection port D; 9039. d space; 9040. a standby detection E port; 9041. e space; 9042. f, detecting an F port for standby; 9043. f, space; 9044. a G port is detected for standby; 9045. g space; 9046. a fixed bracket;
10. a compressed air system; 1001. an air-pressure manual ball valve; 1002. an air source triplet; 1003. manually adjusting the needle valve; 1004. a compressed air conduit;
11. a reducing agent rough adjustment system; 1101. a pin removal agent vat; 1102. an ammonia supplementing pump; 1103. a pin removal agent keg; 1104. an ammonia spraying A pump; 1105. a pin removal agent A pipeline; 1106. coarse adjusting ball valve; 1107. a rough adjustment pressure stabilizing valve; 1108. manual rough adjusting needle valve;
12. a reducing agent fine adjustment system; 1201. an ammonia spraying B pump; 1202. a pin removal agent B pipeline; 1203. finely adjusting a ball valve; 1204. fine-tuning the pressure stabilizing valve; 1205. manually fine-adjusting the needle valve;
13. a three-fluid spray gun;
14. and a condensate collecting pipe.
Description of the embodiments
The present application will be described in further detail with reference to the accompanying drawings. Referring to fig. 1-6, an energy-saving efficient composite denitration device comprises a smoke gas inlet system 1 and an efficient heat exchange system 2 which are sequentially connected; the high-efficiency heat exchange system 2 is connected with three paths of processing systems for processing respectively and then is gathered into an SNCR denitration A tower 8;
the three processing systems are respectively as follows: a primary flue gas system 4, a secondary flue gas system 5 and a tertiary flue gas system 6; the gas of the primary flue gas system 4 and the gas of the natural gas inlet system 7 are connected in parallel and then are gathered into an SNCR denitration A tower 8; the secondary flue gas system 5 and the tertiary flue gas system 6 are sprayed by a three-fluid spray gun system and respectively enter an SNCR denitration A tower 8;
the SNCR denitration A tower 8 is connected with the SCR denitration B tower 9, and the flue gas of the SCR denitration B tower 9 enters the smoke exhaust system 3 after being treated by the efficient heat exchange system 2.
Referring to fig. 4, the SNCR denitration a tower 8 includes a combustion zone 801, an SNCR reaction zone 802, and a mixed third zone 803 in this order in the gas flow direction; the SNCR denitration A tower 8 shell wraps the heat preservation A layer 810.
The combustion zone 801 is a combustion space of primary flue gas, air and natural gas;
the SNCR reaction zone 802 comprises an annular A cavity 804 communicated with the secondary flue gas system 5, a cyclone plate 806 is arranged in the annular A cavity 804, gas in the combustion zone 801 enters the SNCR reaction zone 802 from a secondary flue gas outlet 807, and an SNCR flue gas temperature detection port 808 is arranged in the SNCR reaction zone 802; the gas in the SNCR reaction zone 802 includes high temperature flue gas, secondary flue gas, and gaseous denitration reducing agent generated by combustion in the combustion zone 801.
A condensate water a pipe 812 is arranged at the bottom of the annular a cavity 804.
The third mixing zone 803 comprises an annular B cavity 805 communicated with the tertiary flue gas system 6, and the annular B cavity 805 is communicated with the reaction space of the third mixing zone 803 through a tertiary flue gas outlet 809; the gas mixed in the third zone 803 comprises the high temperature flue gas, the tertiary flue gas and the gaseous denitration reducing agent after the mixed reaction in the SNCR reaction zone 802.
The mixed third zone 803 is followed by a high temperature flue gas duct 811.
Referring to fig. 5, the SCR denitration B column 9 includes a mixed fourth zone 901, a mixed fifth zone 902, and an SCR reaction zone 903 in this order in the direction of gas flow.
A standby detection A port 9013 and an umbrella-shaped outlet 9012 with a downward opening are arranged in the mixing fourth area 901, and a homogenization A layer 9011 and a condensate water B pipe 9014 are arranged at the bottom of the mixing fourth area 901; the middle part of the fifth mixing zone 902 is provided with a catalyst initial smoke temperature detection port 9022, and the bottom part is provided with a homogenization B layer 9021.
The SCR reaction area 903 is connected with the smoke exhaust system 3 through a fixing support 9046, the SCR reaction area 903 comprises a plurality of layers of reaction spaces, the outer wrapping heat preservation B layer 9035 of the plurality of layers of reaction spaces comprises, in sequence:
a first layer of catalyst 9031 and a C space 9037, wherein a standby detection C port 9036 is arranged in the C space 9037;
a second layer of catalyst 9032 and a D space 9039, wherein a standby detection D port 9038 is arranged in the D space 9039;
an E space 9041, wherein a standby detection E port 9040 is provided in the E space 9041;
a third layer of catalyst 9033 and an F space 9043, wherein a standby detection F port 9042 is arranged in the F space 9043;
a standby layer catalyst 9034 and a G space 9045, wherein a standby detection G port 9044 is provided in the G space 9045.
Referring to FIG. 6, the three fluid spray gun system includes a compressed air system 10, a coarse reductant adjustment system 11, a fine reductant adjustment system 12, and a three fluid spray gun 13 at the end of the system.
The compressed air system 10 comprises a compressed air pipeline 1004, and an air pressure manual ball valve 1001, an air source triple 1002 and a manual adjusting needle valve 1003 are sequentially arranged on the compressed air pipeline 1004 along the air flow direction.
The reducing agent rough adjustment system 11 comprises a pin removal agent vat 1101, an ammonia supplementing pump 1102 and a pin removal agent vat 1103 which are sequentially connected, the pin removal agent vat 1103 is connected with an ammonia spraying A pump 1104 and a pin removal agent A pipeline 1105, and a rough adjustment ball valve 1106, a rough adjustment pressure stabilizing valve 1107 and a manual rough adjustment needle valve 1108 are sequentially arranged on the pin removal agent A pipeline 1105 along the flow direction of the denitration agent; the off-set A conduit 1105 terminates into a three-fluid gun 13.
The reducing agent fine adjustment system 12 comprises an ammonia spraying B pump 1201 connected with a denitration agent small barrel 1103, wherein the ammonia spraying B pump 1201 is connected with a denitration agent B pipeline 1202, and a fine adjustment ball valve 1203, a fine adjustment pressure stabilizing valve 1204 and a manual fine adjustment needle valve 1205 are sequentially arranged on the denitration agent B pipeline 1202 along the flow direction of the denitration agent; the off-stock B pipe 1202 terminates into a three-fluid gun 13.
A gas circuit of the natural gas inlet system 7 is sequentially provided with a gas main valve 701, a manual gas valve 702, a gas electromagnetic valve 703, an air-fuel ratio valve 704 and a heating burner 705, wherein the heating burner 705 is arranged at the inlet end of the SNCR denitration A tower 8; the primary flue gas system 4 comprises a primary pipeline 401 for conveying primary flue gas and an air mixing pipeline, wherein a proportional control valve 402 is arranged on the primary pipeline 401; the air mixing pipeline is sequentially provided with a high-pressure blower 403, a manual adjusting valve 404 and a proportional adjusting valve 405, and the tail end of the air mixing pipeline is connected to a heating burner 705.
The smoke inlet system 1 is provided with a smoke inlet detection port 102 and a smoke inlet three-way detection port 103, and pretreated smoke enters the smoke inlet system 1 through a smoke inlet port 101.
The efficient heat exchange system 2 comprises a flue gas distribution B pipeline 203, heat exchange equipment 202 and a flue gas distribution A pipeline 201, wherein the flue gas distribution B pipeline 203 is communicated with the flue gas inlet system 1, the flue gas distribution A pipeline 201 is communicated with a main pipeline 205, the main pipeline 205 is connected with a three-way treatment system, a secondary flue gas system 5 and a tertiary flue gas system 6 are connected in parallel after being split by the main pipeline 205 and respectively enter an SNCR denitration A tower 8, and the secondary flue gas system 5 comprises a secondary pipeline 501 and a proportion adjusting two valve 502; the tertiary flue gas system 6 comprises a tertiary pipe 601 and a manual adjustment triple valve 602.
The bottom of the high-efficiency heat exchange system 2 is provided with a condensed water C pipe 204.
The smoke exhaust system 3 comprises a smoke exhaust pipeline 301 arranged at the rear of the efficient heat exchange system 2, a smoke exhaust three-way detection port 302 and a smoke exhaust outlet detection port 303 are arranged on the smoke exhaust pipeline 301, and a smoke exhaust umbrella cover 304 is arranged at the tail end of the smoke exhaust pipeline 301.
The condensate a pipe 812, the condensate B pipe 9014 and the condensate C pipe 204 are finally led into the condensate collecting pipe 14 to be discharged from the denitration device according to the present application.
The detection device of the denitration device is not limited to the detection device listed above, and also comprises a plurality of other measurement and control systems necessary according to actual conditions, such as: the system comprises a flue gas temperature measurement and control system, a flue gas component measurement system, a flue gas flow control system and a denitration reducing agent control system.
The smoke temperature measurement and control system comprises SNCR reaction zone smoke temperature measurement and control, catalyst initial smoke temperature measurement and control, catalyst end smoke temperature measurement and control, smoke emission temperature measurement after reaching standards, initial smoke temperature measurement and a plurality of standby port temperature measurements;
the smoke component measurement system consists of initial smoke component measurement and smoke emission component measurement reaching the standard;
the flue gas flow control system consists of initial flue gas flow measurement and flue gas standard discharge flow measurement;
the denitration reducing agent control system consists of denitration reducing agent rough adjustment control, denitration reducing agent fine adjustment control and denitration reducing agent metering control.
The main process of the denitration device of the application has the working principle that: the temperature of the pretreated flue gas is further increased after the flue gas enters the efficient heat exchange system 2 through the flue gas inlet interface 101, the flue gas is divided into three stages, and the vaporific denitration liquid sprayed out by the three-fluid spray gun 13 is mixed with the flue gas to form two-stage and three-stage flue gas.
The primary flue gas is mixed with air through a proportional control valve 402 and then enters a heating burner 705 through a high-pressure blower 403, a manual control valve 404 and a proportional control valve 405, and meanwhile, natural gas also enters the heating burner 705 through a gas main valve 701, a manual gas valve 702, a gas electromagnetic valve 703 and an air-fuel ratio example valve 704, so that automatic combustion of the heating burner 705 is realized, the heating power is automatically adjusted by five-gear power according to the acquisition temperature at a catalyst initial flue gas temperature detection port 9022, and the flow of the primary flue gas is automatically adjusted by the proportional control valve 405 according to the five-gear heating power, so that low-nitrogen heating combustion of the heating burner 705 is realized;
the secondary flue gas enters the annular A cavity 804 through the proportion adjusting two valve 502, passes through the cyclone plate 806, and enters the SNCR reaction zone 802 through the secondary flue gas outlet 807 in a rotating way, and meanwhile, the high-temperature flue gas in the combustion zone 801 also enters the SNCR reaction zone 802, wherein the proportion adjusting valve 405 automatically adjusts the flow by the acquisition temperature at the SNCR flue gas temperature detection port 808, so that the reaction temperature of the SNCR reaction zone 802 is always in an ideal range, and the SNCR denitration treatment of the primary flue gas and the secondary flue gas is realized.
Third-stage flue gas enters an annular B cavity 805 through a manual adjusting three-valve 602, enters a mixed third region 803 through a three-stage flue gas outlet 809, is mixed with first-stage and second-stage flue gas, is further mixed through a high-temperature flue gas pipeline 811, is sprayed out through an umbrella-shaped outlet 9012, is uniformly dispersed after being folded back through a homogenizing A layer 9011, is greatly homogenized in temperature field and concentration field, enters a mixed fifth region 902 through a homogenizing B layer 9021, is ideally homogenized in temperature field and concentration field, passes through a first-layer catalyst 9031, a second-layer catalyst 9032, a third-layer catalyst 9033, a standby-layer catalyst 9034 and other multi-layer catalysts, and is subjected to SCR denitration reaction, cooled through a high-efficiency heat exchange system 2, and is discharged through a smoke discharging pipeline 301 and a smoke discharging umbrella cover 304 after reaching standards.
The control principle of the application for high denitration efficiency and low ammonia escape is as follows:
the flue gas is divided into three stages, the first stage flue gas passes through the heating burner 705 to realize low-nitrogen combustion, and more NO is prevented from being generated in the heating process of the flue gas X The SNCR denitration treatment of the smoke is completed in the SNCR reaction zone 802 by the primary smoke and the secondary smoke, the initial concentration of NOX of the smoke is reduced by 10% -20%, and the difficulty of the next denitration treatment is reduced.
1. Mixing the two-stage and three-stage flue gas for multiple times, homogenizing, introducing the homogenized flue gas into an SCR denitration B tower 9 for catalytic denitration, and discharging the flue gas through a smoke exhaust pipeline 301 and a smoke exhaust umbrella cover 304 after reaching the standard. Wherein the smoke parameters (flow, smoke temperature, NO) measured at the smoke inlet detection port 102 X The concentration of the exhaust gas at the standby detection G port 9044 and the flue gas parameters (flow rate, NOX concentration, NH3 concentration) at the exhaust gas outlet detection port 303) to calculate and control the amount of the denitration reducing agent fine adjustment system 12 to be within the normal range.
The working principle of the three-fluid spray gun system provided by the application is as follows:
the three fluids are compressed air, a large-flow denitration reducing agent and a small-flow denitration reducing agent.
The compressed air system is that compressed air enters a three-fluid spray gun 13 through the adjustment of a manual adjusting needle valve 1003 after being subjected to pressure stabilizing control through an air pressure manual ball valve 1001 and an air source triple piece 1002;
the denitration reducing agent is automatically pumped into a denitration agent small barrel 1103 from a denitration agent large barrel 1101 by an ammonia supplementing pump 1102, the large-flow denitration reducing agent is automatically pumped into a denitration agent A pipeline 1105 from an ammonia spraying A pump 1104 from the denitration agent small barrel 1103, and then enters a three-fluid spray gun 13 through adjustment of a rough adjusting ball valve 1106, a rough adjusting pressure stabilizing valve 1107 and a manual rough adjusting needle valve 1108;
the small flow denitration reducing agent is automatically pumped into a denitration agent B pipeline 1202 from a denitration agent small barrel 1103 by an ammonia injection B pump 1201, and then enters the three-fluid spray gun 13 through the adjustment of a fine adjustment ball valve 1203, a fine adjustment pressure stabilizing valve 1204 and a manual fine adjustment needle valve 1205.
The present application is not limited to the above-described structure, and can be applied to many different fields, and in any case, all modifications and variations without departing from the design concept, mechanical structure and intelligent driving control mode of the present application are included in the scope of the present application.
Claims (8)
1. An energy-conserving high-efficient compound denitration device, its characterized in that: comprises a smoke gas inlet system (1) and a high-efficiency heat exchange system (2) which are sequentially connected; the high-efficiency heat exchange system (2) is connected with the three paths of processing systems for processing respectively and then is led into an SNCR denitration A tower (8); the SNCR denitration A tower (8) is connected with the SCR denitration B tower (9) in back, and the flue gas of the SCR denitration B tower (9) enters the smoke exhaust system (3) after being processed by the efficient heat exchange system (2);
the three processing systems are respectively as follows: a primary flue gas system (4), a secondary flue gas system (5) and a tertiary flue gas system (6); the primary flue gas system (4) is connected with the gas of the natural gas inlet system (7) in parallel and then is led into the SNCR denitration A tower (8); the secondary flue gas system (5) and the tertiary flue gas system (6) are sprayed by a three-fluid spray gun system and respectively enter an SNCR denitration A tower (8);
the SNCR denitration A tower (8) sequentially comprises a combustion zone (801), an SNCR reaction zone (802) and a mixed third zone (803) along the airflow direction;
the combustion zone (801) is a combustion space of primary flue gas, air and natural gas;
the SNCR reaction zone (802) comprises an annular A cavity (804) communicated with the secondary flue gas system (5), and swirl plates (806) are arranged in the annular A cavity (804);
the mixed third zone (803) comprises an annular B cavity (805) communicated with the tertiary flue gas system (6), and the annular B cavity (805) is communicated with the reaction space of the mixed third zone (803) through a tertiary flue gas outlet (809); the mixed third zone (803) is followed by a high temperature flue gas pipeline (811);
the three-fluid spray gun system comprises a compressed air system (10), a reducing agent rough adjustment system (11) and a reducing agent fine adjustment system (12) which are connected in parallel; the three-fluid spray gun system terminal is provided with a three-fluid spray gun (13).
2. The energy-saving and efficient composite denitration device according to claim 1, wherein: the SCR denitration B tower (9) sequentially comprises a mixed fourth zone (901), a mixed fifth zone (902) and an SCR reaction zone (903) along the airflow direction; an umbrella-shaped outlet (9012) is arranged in the mixing fourth region (901), and a homogenization A layer (9011) is arranged at the bottom of the mixing fourth region (901); the bottom of the mixing fifth zone (902) is provided with a homogenization B layer (9021).
3. The energy-saving and efficient composite denitration device according to claim 2, wherein: the SCR reaction zone (903) includes a multi-layer reaction space including, in order, a first layer catalyst (9031), a C space (9037), a second layer catalyst (9032), a D space (9039), an E space (9041), a third layer catalyst (9033), an F space (9043), a spare layer catalyst (9034), and a G space (9045).
4. The energy-saving and efficient composite denitration device according to claim 1, wherein: the compressed air system (10) comprises a compressed air pipeline (1004), and an air pressure manual ball valve (1001), an air source triple piece (1002) and a manual adjusting needle valve (1003) are sequentially arranged on the compressed air pipeline (1004) along the air flow direction.
5. The energy-saving and efficient composite denitration device according to claim 1, wherein: the reducing agent coarse adjustment system (11) comprises a pin removal agent vat (1101), an ammonia supplementing pump (1102) and a pin removal agent vat (1103) which are sequentially connected, wherein the pin removal agent vat (1103) is connected with an ammonia spraying A pump (1104) and a pin removal agent A pipeline (1105), and the terminal of the pin removal agent A pipeline (1105) is converged into a three-fluid spray gun (13); the reducing agent fine adjustment system (12) comprises an ammonia spraying B pump (1201) connected with a pin-removing agent small barrel (1103), the ammonia spraying B pump (1201) is connected with a pin-removing agent B pipeline (1202) in back, and the terminal of the pin-removing agent B pipeline (1202) is converged into the three-fluid spray gun (13).
6. The energy-saving and efficient composite denitration device according to claim 1, wherein: a gas main valve (701), a manual gas valve (702), a gas electromagnetic valve (703), an air-fuel ratio valve (704) and a heating burner (705) are sequentially arranged on a gas path of the natural gas inlet system (7), and the heating burner (705) is arranged at the gas inlet end of the SNCR denitration A tower (8); the primary flue gas system (4) comprises a primary pipeline (401) for conveying primary flue gas and an air mixing pipeline, wherein a proportional adjusting valve (402) is arranged on the primary pipeline (401); the air mixing pipeline is sequentially provided with a high-pressure blower (403), a manual adjusting valve (404) and a proportional adjusting valve (405), and the tail end of the air mixing pipeline is connected to a heating burner (705).
7. The energy-saving and efficient composite denitration device according to claim 1, wherein: a smoke inlet detection port (102) and a smoke inlet three-way detection port (103) are arranged on the smoke inlet system (1); the efficient heat exchange system (2) comprises a flue gas distribution B pipeline (203), heat exchange equipment (202) and a flue gas distribution A pipeline (201), wherein the flue gas distribution B pipeline (203) is communicated with the flue gas inlet system (1), the flue gas distribution A pipeline (201) is communicated with a main pipeline (205), and the main pipeline (205) is connected with a three-way treatment system.
8. The energy-saving and efficient composite denitration device according to claim 7, wherein: the smoke exhaust system (3) comprises a smoke exhaust pipeline (301) arranged at the rear of the efficient heat exchange system (2), and a smoke exhaust three-way detection port (302) and a smoke exhaust outlet detection port (303) are arranged on the smoke exhaust pipeline (301).
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