CN213193034U - Ultralow integration processing system that discharges of alkali recovery furnace flue gas - Google Patents
Ultralow integration processing system that discharges of alkali recovery furnace flue gas Download PDFInfo
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- CN213193034U CN213193034U CN202021144463.2U CN202021144463U CN213193034U CN 213193034 U CN213193034 U CN 213193034U CN 202021144463 U CN202021144463 U CN 202021144463U CN 213193034 U CN213193034 U CN 213193034U
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- denitration
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Abstract
The utility model discloses an ultralow integration processing system that discharges of alkali recovery furnace flue gas, including electrostatic precipitator, rotary heat exchanger, dust removal denitration integrated device, draught fan, exhaust-heat boiler and the chimney that connects gradually, set up the combustor in the flue between the former flue gas side export of rotary heat exchanger and the import of dust removal denitration integrated device, be connected with on the flue between combustor export and the import of the integrative device of dust removal denitration and supply the ammonia system. The utility model discloses an integrated processing system is discharged to alkali recovery furnace flue gas minimum removes dust and denitration treatment to the flue gas, has characteristics such as the device is simple, the operation is stable, dust removal denitration is efficient, enables alkali recovery furnace flue gas and reaches minimum emission requirement.
Description
Technical Field
The utility model relates to an ultralow integration processing system that discharges of alkali recovery furnace flue gas belongs to alkali recovery furnace flue gas processing technology field.
Background
The alkali recovery boiler is characterized by that the waste liquor (black liquor) discharged after the alkaline paper-making pulp-washing process is concentrated and used as fuel, and fed into the boiler to make combustion, and the combustion process is aimed at recovering heat quantity of alkali and organic component in the waste liquor of pulp-making process, so that said alkali recovery boiler also is an important equipment for protecting environment and saving energy source in the paper-making industry. The characteristics of the flue gas of the alkali recovery furnace are as follows: high moisture content, low oxygen content, NO as the main contaminantXAnd dust, SO2Low concentration and almost no SO3、HCl、HF。
The flue gas treatment of the alkali recovery furnace with the discharged flue gas temperature of 180-200 ℃ is always a great problem in the industry, in the traditional process, an electrostatic dust collector is adopted in a dust removing part, and due to the particularity of dust in the flue gas of the alkali recovery furnace, the dust at the outlet of the electrostatic dust collector can be controlled to be 40-50 mg/Nm at most3The requirement of ultra-low dust emission cannot be met; the denitration part adopts an SNCR process, and the SNCR denitration efficiency is 30-60%, so that the ultralow emission requirement is difficult to meet.
Therefore, when the temperature of the flue gas discharged by the alkali recovery furnace is lower, in order to meet the ultra-low discharge requirement on the flue gas of the alkali recovery furnace, ensure the high-quality stable operation of the system and realize the maximum environmental protection benefit, it is particularly important to design an integrated treatment system with the efficient flue gas purification effect for the ultra-low discharge of the flue gas of the alkali recovery furnace.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that current alkali recovery furnace flue gas treatment exists, the utility model aims to provide an alkali recovery furnace flue gas ultralow emission integration processing system, characteristics such as the device is simple, the operation is stable, dust removal denitration is efficient enable alkali recovery furnace flue gas to reach the ultralow emission requirement.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an ultralow integration processing system that discharges of alkali recovery furnace flue gas, includes electrostatic precipitator, rotary heat exchanger (GGH), dust removal denitration integrated device, draught fan, exhaust-heat boiler and the chimney that connects gradually, set up the combustor in the flue between the former flue gas side export of rotary heat exchanger and the dust removal denitration integrated device import, be connected with on the flue between combustor export and the integrative device import of dust removal denitration and supply the ammonia system.
Preferably, the bottom ash bucket outlet of the electrostatic dust collector is provided with a scraper, and all the alkali ash collected by the ash bucket is conveyed to the alkali ash mixing tank through the scraper for recycling.
Preferably, the rotary heat exchanger is a gas-gas heat exchanger, heat exchange is carried out between the original flue gas at the outlet of the electrostatic dust collector and the clean flue gas at the outlet of the dust and denitration integrated device, heat recovery and utilization are carried out on the high-temperature clean flue gas at the outlet of the dust and denitration integrated device, and fuel consumption of the system is reduced.
Preferably, the combustor is a flue built-in combustor, the temperature of the flue gas at the outlet of the original flue gas side of the rotary heat exchanger is raised, the fuel is natural gas, and the combustion-supporting air is air; and after the temperature is raised, the flue gas enters a dedusting and denitration integrated device to be subjected to high-temperature dedusting and denitration.
Preferably, a plurality of dust removal and denitration filter bags are arranged in the dust removal and denitration integrated device, and the dust removal and denitration filter bags are ceramic fiber filter tubes coated with denitration catalysts on the inner layers. The basic material of the ceramic fiber filter tube is ceramic fiber, the fiber filter tube is made of a mold at high temperature and high pressure, and the inner layer is coated with a denitration catalyst, so that the dedusting and denitration functions are achieved. The denitration catalyst is distributed in a nano-scale mode, the operation temperature and the activity are optimal when the temperature is 250-350 ℃, and the highest temperature can be 600 ℃. For ceramic fiber filter tubes, containing NOx and NH3When the flue gas passes through the fine filter layer, the flue gas directly collides with the catalyst, the reaction efficiency is very high, the use amount of the catalyst can be reduced, and the phenomena of catalyst blockage and poisoning are thoroughly solved.
Preferably, the ammonia supply system comprises an ammonia water storage tank, an ammonia water delivery pump, a two-fluid spray gun, an ammonia water evaporator and an ammonia spraying grid which are connected in sequence, wherein the ammonia spraying grid is arranged in a flue between an outlet of the combustor and an inlet of the dust removal and denitration integrated device.
Compared with the prior art, the utility model has the advantages that:
(1) the utility model discloses an integration processing system compares in adopting low temperature catalyst, and ceramic fiber filter bag takes middle and high temperature catalyst, has that the quantity is few, long service life, changes the cycle length, characteristics such as the working costs is low.
(2) The utility model discloses an integration processing system deNOx systems moves under low sulfur low dust, and nearly no sulphur ammonia salt generates, has stopped the possibility that catalyst became invalid, has guaranteed the long-term steady operation of catalyst.
(3) The utility model discloses an integrative device of dust removal denitration is made up into with the denitration part to the dust removal of integration processing system flue gas, does not need dispose sack cleaner and SCR denitration reactor alone, and the device is simple, take up an area of for a short time, very big reduction equipment steel consume with support the steel that the steel constructs consume.
(4) The integrated treatment system of the utility model adopts the ceramic fiber filter bag, can bear higher flue gas temperature compared with the traditional cloth bag, and can reach 600 ℃ at most; the diameter of the ceramic fiber is about 2-3 μm, the filtering precision is high, and the minimum particle can be removed to 2mg/Nm3And is far higher than the requirement of ultra-low emission standard.
(5) The utility model discloses a when integration processing system was applied to alkali recovery furnace flue gas and administers, system alkali ash retrieved to alkali ash mixing tank through electrostatic precipitator, and return system realizes resource cyclic utilization.
(6) The utility model discloses an integration processing system adopts rotary heat exchanger to carry out the heat transfer to the former flue gas of electrostatic precipitator export and the clean flue gas of integrative device export of dust removal denitration, make full use of the heat of the high temperature flue gas of back that heaies up, improved system's heat utilization efficiency, reduced combustor fuel consumption.
(7) The utility model discloses an integration processing system adopts exhaust-heat boiler to carry out waste heat recovery to system tail exhaust gas, has realized energy-concerving and environment-protective, builds the energy waste less.
(8) The utility model discloses an integration processing system can realize the ultralow emission, and processing apparatus is simple, and the operation is stable, and the working costs still less has stronger practicality and economic nature.
Drawings
FIG. 1 is a schematic structural view of an integrated treatment system for ultralow emission of flue gas from a soda recovery furnace according to the present invention;
wherein: 1. the device comprises an electrostatic dust collector, 2 a rotary heat exchanger, 3 a dust removal and denitration integrated device, 4 a draught fan, 5 a waste heat boiler, 6 a chimney, 7 a combustor, 8 a scraper, 9 an ammonia water storage tank, 10 an ammonia water delivery pump, 11 a two-fluid spray gun, 12 an ammonia water evaporator, 13 an ammonia spraying grid.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left", "right", "top" and "bottom" will be used hereinafter to refer only to the directions of the top, bottom, left, right, top and bottom of the drawings, and shall not be construed as limiting the structure.
As shown in FIG. 1, for the utility model relates to an ultralow integration processing system that discharges of preferred alkali recovery furnace flue gas, including electrostatic precipitator 1, rotary heat exchanger (GGH)2, dust removal denitration integrated device 3, draught fan 4, exhaust-heat boiler 5 and the chimney 6 that connect gradually, set up combustor 7 in the flue between 2 former flue gas side exports of rotary heat exchanger and the 3 import of dust removal denitration integrated device, be connected with on the flue between the 3 imports of combustor 7 export and the integrative device of dust removal denitration and supply the ammonia system.
The bottom ash bucket outlet of the electrostatic dust collector 1 is provided with a scraper 8, and all the alkali ash collected by the ash bucket is conveyed to an alkali ash mixing tank through the scraper 8 for recycling.
The rotary heat exchanger 2 is a gas-gas heat exchanger, exchanges heat with the clean flue gas (high-temperature side) at the outlet of the dust and denitration integrated device 3 through the original flue gas (low-temperature side) at the outlet of the electrostatic dust collector 1, and recovers and utilizes the waste heat of the clean flue gas at the high temperature at the outlet of the dust and denitration integrated device 3, thereby reducing the fuel consumption of the system.
The combustor 7 is a flue built-in combustor, the temperature of the flue gas at the outlet of the original flue gas side of the rotary heat exchanger 2 is raised, the fuel is natural gas, and combustion-supporting air is air; after the temperature is raised, the flue gas enters a dedusting and denitration integrated device 3 to be subjected to high-temperature dedusting and denitration.
A plurality of dust removal and denitration filter bags are arranged in the dust removal and denitration integrated device, and the dust removal and denitration filter bags are ceramic fiber filter tubes of which the inner layers are coated with denitration catalysts. The ceramic fiber filter tube is made of ceramic fibers with the diameter of about 2-3 mu m, is made of a mold at high temperature and high pressure, and is coated with a denitration catalyst at the inner layer, so that the dedusting and denitration functions are achieved. The inner layer catalyst coated on the inner layer of the ceramic fiber filter tube is in nano-scale distribution, and the operation temperature and the activity are optimal when the temperature is 250-350 ℃. For ceramic fiber filter tubes, containing NOx and NH3When the flue gas passes through the fine filter layer, the flue gas directly collides with the catalyst, the reaction efficiency is high, the use amount of the catalyst can be reduced, and the phenomena of catalyst blockage and poisoning are thoroughly solved.
The ammonia supply system comprises an ammonia water storage tank 9, an ammonia water delivery pump 10, a double-fluid spray gun 11, an ammonia water evaporator 12 and an ammonia spraying grid 13 which are sequentially connected, wherein the ammonia water is evaporated in the ammonia water evaporator 12 by adopting high-temperature flue gas at an outlet of an induced draft fan 4, the high-temperature flue gas is conveyed to an ammonia spraying grid 8 through a pipeline and is uniformly mixed with the flue gas in a spraying flue, and the ammonia spraying grid 13 is arranged in the flue between an outlet of a combustor 7 and an inlet of a dust and denitration integrated device 3.
After dust removal and denitration are completed by the dust removal and denitration integrated device 3, the flue gas is pumped to the waste heat boiler 5 by the draught fan to be subjected to waste heat recovery, and then is discharged into the atmosphere through the chimney 6, so that ultralow emission of the flue gas is realized.
Example 1
Adopt the utility model discloses an ultralow integration processing system that discharges of alkali recovery furnace flue gas specifically as follows to the processing procedure of alkali recovery furnace export flue gas:
step one
Flue gas (NO) from the outlet of the soda recovery furnace at a temperature of 200 ℃xConcentration 400mg/Nm3About 30g/Nm dust particle concentration3Left and right) enters an electrostatic precipitator for preliminary dust removal, and the dust concentration in the outlet flue gas is reduced to 40-50 mg/Nm3Left and right, the temperature of the outlet flue gas is reduced to 180 ℃;
step two
After the flue gas is subjected to preliminary dust removal, the flue gas enters a rotary heat exchanger for preliminary preheating, and after the temperature of the flue gas is increased from 180 ℃ to 260 ℃, the flue gas enters a flue section of a combustor for heating to 290 ℃, wherein the fuel adopts natural gas, and combustion-supporting air adopts air;
step three
After ammonia water is evaporated by flue gas with the temperature of about 200 ℃ at the outlet of the induced draft fan, the ammonia water is uniformly mixed with the flue gas after temperature rise through an ammonia spraying grid, the flue gas enters a dust removal and denitration integrated device for dust removal and denitration, and NO in the outlet flue gasXThe concentration is reduced to 50mg/Nm3The dust concentration was reduced to 5mg/Nm3The ultra-low emission requirement is met;
step four
After the flue gas is subjected to dust removal and denitration by the dust removal and denitration integrated device, the 280 ℃ flue gas enters the rotary heat exchanger to exchange heat with low-temperature side raw flue gas (180 ℃) and is cooled to about 200 ℃, the flue gas is pumped to a waste heat boiler by an induced draft fan to recover waste heat, the flue gas is discharged into the atmosphere through a chimney after the temperature of the flue gas is reduced to 75-90 ℃, and ultralow emission of the flue gas of the alkali recovery furnace is realized.
Claims (6)
1. The utility model provides an ultralow integration processing system that discharges of alkali recovery furnace flue gas which characterized in that: including electrostatic precipitator, rotary heat exchanger, dust removal denitration integrated device, draught fan, exhaust-heat boiler and the chimney that connects gradually, set up the combustor in the flue between rotary heat exchanger former flue gas side export and the dust removal denitration integrated device import, be connected with on the flue between combustor export and the integrative device import of dust removal denitration and supply the ammonia system.
2. The ultra-low emission integrated treatment system for flue gas of a soda recovery furnace according to claim 1, characterized in that: and the bottom ash bucket outlet of the electrostatic dust collector is provided with a scraper, and all the alkali ash collected by the ash bucket is conveyed to an alkali ash mixing tank through the scraper for recycling.
3. The ultra-low emission integrated treatment system for flue gas of a soda recovery furnace according to claim 1, characterized in that: the rotary heat exchanger is a gas-gas heat exchanger.
4. The ultra-low emission integrated treatment system for flue gas of a soda recovery furnace according to claim 1, characterized in that: the combustor is a flue built-in combustor.
5. The ultra-low emission integrated treatment system for flue gas of a soda recovery furnace according to claim 1, characterized in that: the dust removal and denitration integrated device is characterized in that a plurality of dust removal and denitration filter bags are arranged in the dust removal and denitration integrated device, and the dust removal and denitration filter bags are ceramic fiber filter tubes of which the inner layers are coated with denitration catalysts.
6. The ultra-low emission integrated treatment system for flue gas of a soda recovery furnace according to claim 1, characterized in that: the ammonia supply system comprises an ammonia water storage tank, an ammonia water delivery pump, a double-fluid spray gun, an ammonia water evaporator and an ammonia spraying grid which are sequentially connected, wherein the ammonia spraying grid is arranged in a flue between an outlet of the combustor and an inlet of the dust removal and denitration integrated device.
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| CN202021144463.2U CN213193034U (en) | 2020-06-19 | 2020-06-19 | Ultralow integration processing system that discharges of alkali recovery furnace flue gas |
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| CN202021144463.2U CN213193034U (en) | 2020-06-19 | 2020-06-19 | Ultralow integration processing system that discharges of alkali recovery furnace flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115463531A (en) * | 2022-10-12 | 2022-12-13 | 济南国能环境工程有限公司 | Ultralow-emission purification treatment system and method for sulfur and nitrate dust in flue gas at tail of biomass boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115463531A (en) * | 2022-10-12 | 2022-12-13 | 济南国能环境工程有限公司 | Ultralow-emission purification treatment system and method for sulfur and nitrate dust in flue gas at tail of biomass boiler |
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