CN204996282U - Flue gas dust and NOX minimum discharge integrated device - Google Patents

Flue gas dust and NOX minimum discharge integrated device Download PDF

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Publication number
CN204996282U
CN204996282U CN201520719608.XU CN201520719608U CN204996282U CN 204996282 U CN204996282 U CN 204996282U CN 201520719608 U CN201520719608 U CN 201520719608U CN 204996282 U CN204996282 U CN 204996282U
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China
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subregion
filter bag
flue gas
ammonia
gas
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修海明
林宏
陈奎续
朱召平
邓晓东
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Fujian Longking Co Ltd.
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Fujian Longking Co Ltd.
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Abstract

The utility model provides a flue gas dust and NOX minimum discharge integrated device, relates to the dust removal denitration of industry flue gas. Be equipped with the smoke box that admits air, casing, electric field dust removal subregion, filter bag dust removal subregion, air -purifying chamber, the smoke box of giving vent to anger, exhaust duct and support, electric field dust removal subregion, filter bag dust removal subregion, air -purifying chamber are established in the casing, and electric field dust removal subregion flue gas inlet connects the smoke box exhanst gas outlet that admits air, and filter bag dust removal subregion flue gas inlet connects electric field dust removal subregion exhanst gas outlet, the supreme filter bag dust cleaning system that is equipped with is in proper order down followed to the air -purifying chamber, ammonia flue gas mixed zone, ammonia feeding device and denitrification facility, filter bag dust cleaning system settles at filter bag dust removal subregion exhanst gas outlet, the ammonia import of ammonia flue gas mixed zone connects the export of ammonia feeding device ammonia, the ammonia flue gas gas mixture export of ammonia flue gas mixed zone connects denitrification facility's ammonia flue gas gas mixture import, denitrification facility's exhanst gas outlet meets the flue gas inlet of the smoke box of giving vent to anger, the exhanst gas outlet of smoke box of giving vent to anger is arranged outside exhaust duct, prop up and set up at chassis bottom.

Description

A kind of exhaust gas dust and NO xminimum discharge integrated apparatus
Technical field
The utility model relates to the dedusting denitration of industrial smoke, especially relates to a kind of exhaust gas dust and NO xminimum discharge integrated apparatus.
Background technology
Current, the contradiction of socio-economic development and resource, environmental constraints, environmental protection faces more and more stern challenge.One of air-polluting principal element is caused to be exactly that the substance combustion such as ature of coal produces in the industrial processes such as thermoelectricity, cement, iron and steel a large amount of dust and pernicious gas enter in air.Therefore, the harmful pollutants in purified industrial production process is one of the major measure of Air Pollution prevention and control, environmental protect quality.Dedusting, denitrification apparatus are the important environmental protection equipments of one of extensive use.According to coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-the year two thousand twenty) [1]and Chinese Ministry of Environmental Protection is about establishment " 13 " coal-burning power plant's minimum discharge modification scheme [2], these equipment must reach dust < 5mg/Nm before 2017 3, SO 2< 35mg/Nm 3, NO x< 50mg/Nm 3discharge standard.
Electric cleaner is charged in the electric field by means of dust, and the pole plate that faces south under electric field force effect deposits and realizes the high effect dust cleaner of gas cleaning, but due to the restriction of electric precipitation principle, some difficult charged dust and fine grained are just difficult to be collected, are therefore difficult to the requirement reaching minimum discharge.And the filter capacity of sack cleaner is closely related with the exhaust gas dust concentration entered before filter bag.Show in test, as entrance concentration > 10g/m 3time be also difficult to the requirement reaching minimum discharge.So sack cleaner can not realize minimum discharge in most conditions.
The electric-bag complex dust collector of last century Mo China's exploitation is in absorption traditional electrical dust removal mechanism and bag dust removal mechanism advantage, overcome its shortcoming and a kind of Novel dust collection device of developing separately, this device not only has efficiency of dust collection, and high (discharge can reach < 10mg/m 3), advantage that power consumption is low, and extensively can also be adapted to the multiple ature of coal of coal-burning power plant, make the operation that deduster can be long-term, stable.To any one ature of coal, electric-bag complex dust collector can accomplish that the dust concentration entering bag district is less than 10g/m 3, filter bag dedusting subregion so just can be made to discharge and to be less than 10mg/m 3minimum discharge requirement.
NO in flue gas xcontent be produce the main cause of acid rain, acid rain serious harm health and crops.In order to solve NO in flue gas xharm, nationally over nearly 10 years put into effect relevant policies successively, industrial production enterprise has also occurred that the method for denitration of SNCR or SCR makes NO xcontent is reduced in prescribed limit (as coal-burning power plant is down to 50mg/m 3).But due to historical reasons or some technical problem, coal-burning power plant's denitrification apparatus is generally arranged on the boiler economizer port of export, although the flue-gas temperature at this place adapts to the requirement (350 ~ 400 DEG C) of denitration chemical reaction, but the flue gas containing high concentrate dust directly enters blocking, wearing and tearing that denitrification apparatus can cause denitrating catalyst, the service life of catalyst is reduced greatly, improve maintenance cost, shorten maintenance period, affect the generating efficiency of power plant.
Bibliography:
1, generate and change No. [2014] 2093, the energy notice of " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-the year two thousand twenty) " " about the printing and distributing ".
2, Chinese Ministry of Environmental Protection's " notice about establishment " 13 " coal-burning power plant's minimum discharge modification scheme ".
Summary of the invention
The purpose of this utility model is the problems referred to above existed for existing denitrification apparatus, there is provided one that flue gas can be made before inflow denitrification apparatus to remove most dust, make catalyst by the blocking of dust, wearing and tearing, greatly the exhaust gas dust in extending catalyst service life and NO xminimum discharge integrated apparatus.
The utility model is provided with air inlet smoke box, casing, electric field dedusting subregion, filter bag dedusting subregion, air-purifying chamber, smoke box of giving vent to anger, discharge duct and support; The external pending flue gas source of air inlet mouth of described air inlet smoke box, electric field dedusting subregion, filter bag dedusting subregion, air-purifying chamber are located in casing, the gas approach of electric field dedusting subregion taps into the exhanst gas outlet of gas smoke box, and the gas approach of filter bag dedusting subregion connects the exhanst gas outlet of electric field dedusting subregion; Air-purifying chamber is provided with filter bag ash removal system, ammonia flue gas mixed zone, ammonia gas supplying device and denitrification apparatus from bottom to up successively, filter bag ash removal system footprint is at the exhanst gas outlet of filter bag dedusting subregion, the ammonia import of ammonia flue gas mixed zone connects the ammonia outlet of ammonia gas supplying device, the ammonia flue gas mixed gas outlet of ammonia flue gas mixed zone connects the ammonia flue gas combi inlet port of denitrification apparatus, the exhanst gas outlet of denitrification apparatus picks out the gas approach of gas smoke box, and the exhanst gas outlet of smoke box of giving vent to anger is arranged outward through discharge duct; Prop up and be erected at bottom of shell.
Airflow-distribution board can be provided with in described air inlet smoke box.
Described electric field dedusting subregion can be provided with at least 10 collecting plates, corona wire and electric district ash bucket, and corona wire is located between adjacent collecting plate, and electric district ash bucket is positioned at bottom electric field dedusting subregion.
Described filter bag dedusting subregion can be provided with filter bag, Dai Longhedai district ash bucket, and bag cage is located in filter bag, and bag district ash bucket is positioned at bottom filter bag dedusting subregion.
Described filter bag ash removal system can be provided with nozzle, injection tube, point gas tank, pulse valve, compressed air inlet, and nozzle is arranged in injection tube, and a termination of injection tube divides gas tank, and pulse valve and compressed air inlet are located on point gas tank.
Electric field dedusting subregion works under the high temperature conditions, and temperature is 350 ~ 400 DEG C.Under the high temperature conditions, its ratio resistance is more much lower than (about 150 DEG C) during low temperature, thus under electric field force effect, its migration velocity increases exponentially, and can improve the efficiency of dust collection of electric field dedusting subregion for dust.
Filtrate dedusting subregion can adopt stainless steel metal filtrate, and its dust-collecting face adopts the stainless steel felt material of 10 μm, and carries on the back the felt material that dirt face adopts 30 μm, and grammes per square metre is at 1000g/m 2above.Through VDI media performance testing machine test, its discharge can at <1mg/m 3in scope.
Because denitrification apparatus is arranged in the air-purifying chamber above filter bag dedusting subregion, just there was strict demand (flow deviation value < ± 5% between each room in electricity Dai composite dedusting district to the airflow uniform distribution of filter bag originally, each filter bag is indoor, the flow root-mean-square-deviation σ <0.2 of filter bag), like this, the air-flow entering denitrification apparatus just has good uniform performance, and it is more much better than the uniform effect of general denitrification apparatus only by the grid distribution grid of entrance point.
Its air-flow rate of climb of air-purifying chamber is generally 1.0 ~ 1.2m/s, far below the flow velocity (4 ~ 5m/s) of air-flow in conventional denitrification apparatus.Like this, be easier to increase flue gas by the time of staying (>0.5s) of denitrification apparatus, the time of contact of prolong smoke and catalyst, the chemical reaction of denitrification process can be strengthened.
In air-purifying chamber, adopted by the air-flow of denitrification apparatus and flow from bottom to top, and dust content in flue gas is extremely low (can <10mg/m 3), so greatly reduce dust in flue gas to the washing away of denitrating catalyst, wear and tear, the fault such as blocking.It is by the life cycle of extending catalyst greatly.
Compared with prior art, the utility model has following significant advantage:
(1) dedusting and denitration are integrated in a housing, simplification of flowsheet greatly;
(2) faults such as the structure of denitration after adopting first dedusting can be avoided dust to the washing away of denitrating catalyst, weares and teares, blocking, the life cycle of extending catalyst greatly;
(3) electricity Dai composite dedusting district is adopted can to ensure the minimum discharge (<10mg/m of dust 3), this is that general dust arrester is difficult to realize.
(4) heat exchange efficiency of tail end air preheater can greatly be improved.
The utility model can be used for coal-fired plant flue gas governing system, also can be used for the smoke gas treatment etc. of Industrial Stoves (as glass-melting furnace).
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the A-A profile of Fig. 1;
Fig. 3 is the B-B profile of Fig. 1;
Fig. 4 is the filter bag ash removal system works schematic diagram of inventive embodiments.
Detailed description of the invention
Following examples will be further described the utility model by reference to the accompanying drawings.
See Fig. 1 ~ 4, the utility model embodiment is provided with air inlet smoke box 1, casing 2, electric field dedusting subregion 3, filter bag dedusting subregion 4, air-purifying chamber 5, smoke box 6 of giving vent to anger, discharge duct 7 and support 8; The external pending flue gas source of air inlet mouth 11 of described air inlet smoke box 1, electric field dedusting subregion 3, filter bag dedusting subregion 4, air-purifying chamber 5 are located in casing 2, the gas approach of electric field dedusting subregion 3 taps into the exhanst gas outlet of gas smoke box 1, and the gas approach of filter bag dedusting subregion 4 connects the exhanst gas outlet of electric field dedusting subregion 3; Air-purifying chamber 5 is provided with filter bag ash removal system 51, ammonia flue gas mixed zone 52, ammonia gas supplying device 54 and denitrification apparatus 53 from bottom to up successively, filter bag ash removal system 51 is placed in the exhanst gas outlet of filter bag dedusting subregion 4, the ammonia import of ammonia flue gas mixed zone 52 connects the ammonia outlet of ammonia gas supplying device 54, the ammonia flue gas mixed gas outlet of ammonia flue gas mixed zone 52 connects the ammonia flue gas combi inlet port of denitrification apparatus 53, the exhanst gas outlet of denitrification apparatus 53 picks out the gas approach of gas smoke box 6, and the exhanst gas outlet of smoke box 6 of giving vent to anger is through the outer row of discharge duct 7; Support 8 is located at bottom casing 2.
Airflow-distribution board 12 can be provided with in described air inlet smoke box 1.
Described electric field dedusting subregion 3 can be provided with at least 10 collecting plates 31, corona wire 32 and electric district ash bucket 33, and corona wire 32 is located between adjacent collecting plate 31, and electric district ash bucket 33 is positioned at bottom electric field dedusting subregion 3.
Described filter bag dedusting subregion 4 can be provided with filter bag 41, bag Long42He Dai district ash bucket 43, and bag cage 42 is located in filter bag 41, and bag district ash bucket 43 is positioned at bottom filter bag dedusting subregion 4.
Described filter bag ash removal system 51 can be provided with nozzle 511, injection tube 512, point gas tank 513, pulse valve 514, compressed air inlet 515, nozzle 511 is arranged in injection tube 512, one termination of injection tube 512 divides gas tank 513, and pulse valve 514 and compressed air inlet 515 are located on point gas tank 513.
Electric field dedusting subregion 3 works under the high temperature conditions, and temperature is 350 ~ 400 DEG C.Under the high temperature conditions, its ratio resistance is more much lower than (about 150 DEG C) during low temperature, thus under electric field force effect, its migration velocity increases exponentially, and can improve the efficiency of dust collection of electric field dedusting subregion for dust.
Filtrate dedusting subregion can adopt stainless steel metal filtrate, and its dust-collecting face adopts the stainless steel felt material of 10 μm, and carries on the back the felt material that dirt face adopts 30 μm, and grammes per square metre is at 1000g/m 2above.Through VDI media performance testing machine test, its discharge can at <1mg/m 3in scope.
Because denitrification apparatus is arranged in the air-purifying chamber above filter bag dedusting subregion, just there was strict demand in electricity Dai composite dedusting district to the airflow uniform distribution of filter bag originally.(flow deviation value < ± 5% between each room, each filter bag is indoor, the flow root-mean-square-deviation σ <0.2 of filter bag), the air-flow entering denitrification apparatus so just has good uniform performance, and it is more much better than the uniform effect of general denitrification apparatus only by the grid distribution grid of entrance point.
Its air-flow rate of climb of air-purifying chamber is generally 1.0 ~ 1.2m/s, far below the flow velocity (4 ~ 5m/s) of air-flow in conventional denitrification apparatus.Like this, be easier to increase flue gas by the time of staying (>0.5s) of denitrification apparatus, the time of contact of prolong smoke and catalyst, the chemical reaction of denitrification process can be strengthened.
In air-purifying chamber, adopted by the air-flow of denitrification apparatus and flow from bottom to top, and dust content in flue gas is extremely low (can <10mg/m 3), so greatly reduce dust in flue gas to the washing away of denitrating catalyst, wear and tear, the fault such as blocking.It is by the life cycle of extending catalyst greatly.
The utility model can make the dust in flue gas realize ultralow (<10mg/m 3) discharge, meanwhile, the NO in flue gas can be made by denitrification apparatus xcontent is down to 50mg/m 3below, thus make dust, the NO in flue gas xdischarge reaches the requirement of regulation in July, 2015 Chinese Ministry of Environmental Protection's notice.
Because denitrification apparatus of the present utility model arranges air-flow rear end after cleaning, when denitrating catalyst is worked by the washing away of dust, wear and tear, blocking etc. affects, the significantly service life of extending catalyst.
Ash-laden gas enters from the air inlet smoke box 1 of casing 2 left end, enters the electric field dedusting subregion 3 in electricity Dai composite dedusting district after the airflow-distribution board in air inlet smoke box is uniform.Dust is charged in electric field dedusting subregion 3, and under electric field force effect, most dust (being about 85% ~ 90%) is collected by collecting plate 31, and all the other a small amount of Chargeds be not collected enter the filter bag dedusting subregion 4 in electricity Dai composite dedusting district.Ash-laden gas enters filter bag inner chamber outside filter bag 41, and under the filtration of filter bag, in flue gas, remaining dust is almost all retained down (dust content <10mg/m 3), meet Chinese Ministry of Environmental Protection's notice requirement.Pure flue gas continues the air-purifying chamber 5 entering top.Above-mentioned electric field dedusting subregion 3 and filter bag dedusting subregion 4 are collectively referred to as electricity Dai composite dedusting district, it is different from the combination of general electric cleaner and bag dust collector, it has organically combined both advantage, and the coupling both playing, realizes the effect of 1+1>2.
During the work of filter bag dedusting subregion, filter bag outer surface can progressively accumulate one deck dust along with the prolongation of time, hinders the filtration of filter bag.For this reason, often arranging an installation injection tube 512 above filter bag, injection tube is installed several nozzles 511, each nozzle alignment filter bag, one end of injection tube connects a point of gas tank 513, and point gas tank has pulse valve 514 and compressed air inlet 515.When filter bag needs deashing, autompulse controller is by starting impulse valve, diaphragm in pulse valve is by snap action (about 150ms), make the compressed air in point gas tank spray into filter bag inner chamber by injection tube, nozzle, the reverse gases at high pressure by filter bag will effectively remove the dust stratification of filter bag outer surface.
The hull outside of air-purifying chamber 5 is provided with ammonia gas supplying device 54, and during equipment work, ammonia will enter air-purifying chamber bottom by pipeline, at ammonia flue gas mixed zone 52 and flue gas Homogeneous phase mixing.When after mixing, flue gas continues rise and pass through denitrification apparatus 53, the NO in flue gas xand NH 3kickback is generated N 2and H 2o, thus complete denitrification process.The give vent to anger smoke box 6 of flue gas from top after dedusting, denitration is discharged.

Claims (6)

1. an exhaust gas dust and NO xminimum discharge integrated apparatus, is characterized in that being provided with air inlet smoke box, casing, electric field dedusting subregion, filter bag dedusting subregion, air-purifying chamber, smoke box of giving vent to anger, discharge duct and support; The external pending flue gas source of air inlet mouth of described air inlet smoke box, electric field dedusting subregion, filter bag dedusting subregion, air-purifying chamber are located in casing, the gas approach of electric field dedusting subregion taps into the exhanst gas outlet of gas smoke box, and the gas approach of filter bag dedusting subregion connects the exhanst gas outlet of electric field dedusting subregion; Air-purifying chamber is provided with filter bag ash removal system, ammonia flue gas mixed zone, ammonia gas supplying device and denitrification apparatus from bottom to up successively, filter bag ash removal system footprint is at the exhanst gas outlet of filter bag dedusting subregion, the ammonia import of ammonia flue gas mixed zone connects the ammonia outlet of ammonia gas supplying device, the ammonia flue gas mixed gas outlet of ammonia flue gas mixed zone connects the ammonia flue gas combi inlet port of denitrification apparatus, the exhanst gas outlet of denitrification apparatus picks out the gas approach of gas smoke box, and the exhanst gas outlet of smoke box of giving vent to anger is arranged outward through discharge duct; Prop up and be erected at bottom of shell.
2. a kind of exhaust gas dust and NO as claimed in claim 1 xminimum discharge integrated apparatus, is characterized in that being provided with airflow-distribution board in described air inlet smoke box.
3. a kind of exhaust gas dust and NO as claimed in claim 1 xminimum discharge integrated apparatus, it is characterized in that described electric field dedusting subregion is provided with at least 10 collecting plates, corona wire and electric district ash bucket, corona wire is located between adjacent collecting plate, and electric district ash bucket is positioned at bottom electric field dedusting subregion.
4. a kind of exhaust gas dust and NO as claimed in claim 1 xminimum discharge integrated apparatus, it is characterized in that described filter bag dedusting subregion is provided with filter bag, Dai Longhedai district ash bucket, bag cage is located in filter bag, and bag district ash bucket is positioned at bottom filter bag dedusting subregion.
5. a kind of exhaust gas dust and NO as claimed in claim 1 xminimum discharge integrated apparatus, it is characterized in that described filter bag ash removal system is provided with nozzle, injection tube, point gas tank, pulse valve, compressed air inlet, nozzle is arranged in injection tube, and a termination of injection tube divides gas tank, and pulse valve and compressed air inlet are located on point gas tank.
6. a kind of exhaust gas dust and NO as claimed in claim 1 xminimum discharge integrated apparatus, is characterized in that the temperature of described electric field dedusting subregion is 350 ~ 400 DEG C.
CN201520719608.XU 2015-09-17 2015-09-17 Flue gas dust and NOX minimum discharge integrated device Active CN204996282U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105107330A (en) * 2015-09-17 2015-12-02 福建龙净环保股份有限公司 Integrated device for ultralow emission of flue gas, dust and NOX
CN108079785A (en) * 2017-12-27 2018-05-29 中国科学院过程工程研究所 A kind of double-movement bed reactor and its purposes and processing method in flue gas ash removal denitrification integrated device
CN109663500A (en) * 2019-03-04 2019-04-23 浙江深度能源技术有限公司 A kind of mostly de- bag filter of smoke catalytic

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105107330A (en) * 2015-09-17 2015-12-02 福建龙净环保股份有限公司 Integrated device for ultralow emission of flue gas, dust and NOX
CN108079785A (en) * 2017-12-27 2018-05-29 中国科学院过程工程研究所 A kind of double-movement bed reactor and its purposes and processing method in flue gas ash removal denitrification integrated device
CN109663500A (en) * 2019-03-04 2019-04-23 浙江深度能源技术有限公司 A kind of mostly de- bag filter of smoke catalytic

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