CN105148698A - Boiler flue gas desulfurization and denitrification system - Google Patents

Boiler flue gas desulfurization and denitrification system Download PDF

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Publication number
CN105148698A
CN105148698A CN201510519879.5A CN201510519879A CN105148698A CN 105148698 A CN105148698 A CN 105148698A CN 201510519879 A CN201510519879 A CN 201510519879A CN 105148698 A CN105148698 A CN 105148698A
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CN
China
Prior art keywords
flue gas
boiler
flue
ozone
denitrification
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CN201510519879.5A
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Chinese (zh)
Inventor
胡家富
冯建琳
党元军
王芸
王海珍
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南京白云化工环境监测有限公司
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Priority to CN201510519879.5A priority Critical patent/CN105148698A/en
Publication of CN105148698A publication Critical patent/CN105148698A/en

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Abstract

The invention discloses a boiler flue gas desulfurization and denitrification system. The boiler flue gas desulfurization and denitrification system comprises a boiler, a dust collector, a spray tower, a flue, a chimney, an ozone jet device, a static mixer, an ozone generator connected with the ozone jet device and an air separation device connected with the ozone generator, wherein the boiler, the dust collector, the spray tower, the flue and the chimney are connected sequentially; the ozone jet device and the static mixer are arranged in the flue sequentially in the flue gas flowing direction; a slurry pond area is arranged at the lower part of the spray tower, three lines of spray pipes are horizontally arranged in the middle from bottom to top at equal intervals, lotus-shaped spray nozzles are arranged at the lower ends of the spray pipes, multiple layers of demisting filter screens are arranged at the upper part, the three lines of spray pipes are communicated with the slurry pond area through a pipeline and a circulating pump, an ammonia water inlet is formed in the side wall of the slurry pond area and connected with an ammonia water feeding device, and a slurry discharge port is formed in the bottom of the slurry pond area and connected with an ammonium sulfate recovery system. The system combines desulfurization and denitrification processes, a whole set of complete desulfurization and denitrification system is formed, the occupation area of equipment is reduced, the investment and operation costs of the equipment are reduced substantially, and besides, the denitrification efficiency and the desulfurization efficiency are high.

Description

Boiler flue gas desulfurization denitrating system

Technical field

The invention belongs to field of Environment Protection, a kind of boiler flue gas desulfurization denitrating system of special design.

Background technology

Coal is as main energy sources thing, the total amount of the pollutants such as SO2, NOx of the discharge of its combustion process is very large, serious atmosphere pollution can be caused, harm humans is healthy, to the control of SO2, mainly contain acid system, alkaline process, Gypsum Wet, Dual alkali, ammonia process and metal oxide method etc., wherein, applying more is Dual alkali and ammonia process, wherein because of ammonia process investment with operating cost is low, desulfuration byproduct is the advantage such as valuable chemical raw material and crops chemical fertilizer and receives much concern.

Be divided into two classes to the control of NOx, a class is the generation controlling NOx in coal-fired process, mainly contains low oxygen combustion method, two stage combustion method and flue gas recirculation method etc.; Another kind of is removed by physico-chemical process, mainly contain catalysis, absorption and sorption, electric discharge etc., wherein extensive use is selective catalytic reduction (SCR) and SNCR method (SNCR), although SCR method can realize very high denitration efficiency, meet strict standard limit of smog release, but its technology and equipment system complex, and need special catalyst, whole system investment is higher with operating cost.Although SNCR method technology and equipment system simply, is invested and operating cost is lower, its denitration efficiency is not high, is sometimes difficult to the requirement reaching discharging standards.

As can be seen here, not only flue gas purifying equipment is complicated, floor space is large, it is high to build with operating cost to adopt two covers above independently desulfurization and denitrating system, and independently desulphurization and denitration and dust pelletizing system reasonable combination are got up to realize comprehensive high-efficiency operation and also be there is many difficulties by these.

Summary of the invention

The invention provides a kind of boiler flue gas desulfurization denitrating system, system architecture simplification, investment and operating cost are low, and employing ozone is oxidized to the NO of water soluble high-valence state by being insoluble in water NO in NOx 2, N 2o 5, thus itself and SO 2adopt ammoniacal liquor simultaneously stability in the later stage, reach the object of simultaneous SO_2 and NO removal.

In order to the problems referred to above, the technical solution used in the present invention is such, a kind of boiler flue gas desulfurization denitrating system, comprises the boiler, deduster, spray column, flue and the chimney that are connected successively, and the direction along flow of flue gas is successively set on ozone injection apparatus in flue and static mixer; The ozone generator be connected with ozone injection apparatus, the air separation unit be connected with ozone generator, described spray column bottom is stock tank district, middle part equidistant horizontally disposed three row showers from bottom to top, shower lower end arranges the shower nozzle of lotus shape, top arranges multilayer demist filter screen, three row showers are communicated with stock tank district by pipeline and circulating pump, the sidewall in stock tank district is arranged ammoniacal liquor import, ammoniacal liquor import is connected with ammoniacal liquor device for supplying, arrange plasma discharge mouth bottom stock tank district, described plasma discharge mouth is connected with ammonium sulfate recovery system.

Described ozone injection apparatus comprises the house steward be connected with ozone generator, the some arms being communicated with described house steward and is vertically set on several nozzles of described arm side, in the vertical spaced set flue of described arm, it is contrary that nozzle opening direction and flue gas carry out flow path direction.

Described nozzle is arranged on the side of arm equally spacedly.

In order to the innoxious of desulphurization denitration product and recycling can be realized, ammonium sulfate recovery system comprises the oxidizing tower be connected successively, evaporimeter, cooler crystallizer, centrifuge and drier, the inlet of oxidizing tower communicates with the plasma discharge mouth bottom stock tank district, the air inlet of oxidizing tower is connected with air separation unit gas outlet, and the gas outlet at oxidizing tower top communicates with ozone generator air inlet.

Described demist filter screen is layer 2-3.

Beneficial effect:

1, the present invention first sprays into the water-fast oxidation of nitric oxide of content in flue gas more than 90% is become high-valence state by ozone oxynitrides as oxidant in flue, in spray column, adopt ammoniacal liquor to remove sulfur dioxide in flue gas and nitrogen dioxide as spray agent more simultaneously, desulfurization and denitrification process are combined by this system, define the desulfurization removing nitric system that a whole set of is complete, reduce occupation area of equipment, significantly reduce investment and the operating cost of equipment, denitration efficiency and desulfuration efficiency all can reach more than 95% in addition.

2, the present invention adopts air separation unit to generate oxygen, enter ozone generator, spray ozone by ozone injection apparatus and spray into flue as oxidant, as compared to strong oxidizer material OH, HO2 etc. of adopting additive method to produce as electronic beam method and impulse electric corona method, the life cycle of ozone is relatively long, and energy consumption is low, is a kind of clean strong oxidizer, effectively NO can be oxidized to high-valence state, and the secondary pollution of environment can not be caused.

3, the present invention arranges three layers of shower on the top of spray column, from top to bottom flue gas is sprayed, waterfall curtain is formed in spray column, effectively the sulfur dioxide in flue gas removing and nitrogen dioxide can be removed, in addition, the slurries formed bottom spray column enter oxidizing tower and pass into the oxygen reaction in it thus the sulfurous acid in slurries is oxidized to ammonium sulfate, and then be condensed into saturated solution in pump to evaporimeter, ammonium sulfate and ammonium nitrate crystals is separated out through cooler crystallizer cooling, ammonium sulfate after centrifuge is separated and ammonium nitrate crystals again drying device are dry, the ammonium sulfate of the product formation resourcebility utilization of gained and ammonium nitrate fertilizer, the innoxious of desulphurization denitration product and recycling can be realized.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Detailed description of the invention

In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment only for explaining the present invention, does not form limiting the scope of the present invention.

Shown in Figure 1, a kind of boiler flue gas desulfurization denitrating system, comprises the boiler 1, deduster 2, spray column 3, flue 4 and the chimney 5 that are connected successively, and the direction along flow of flue gas is successively set on ozone injection apparatus 6 in flue and static mixer 7, the ozone generator 8 be connected with ozone injection apparatus 6, the air separation unit 9 be connected with ozone generator 8, described ozone injection apparatus comprises the house steward be connected with ozone generator, be communicated with the some arms of described house steward and be vertically set on several nozzles of described arm side, 6-8 root arm is preferably equidistantly arranged in the lower end of house steward, 5 ~ 8 nozzles are equidistantly arranged in every root arm side, arm is equidistantly arranged perpendicular on flue, it is contrary that nozzle opening direction and flue gas carry out flow path direction, nozzle quantity on concrete arm quantity and arm is determined by flue cross-sectional sizes, guarantee that flue gas is quick, fully oxidized.

The bottom of spray column 3 is stock tank district, middle part equidistant horizontally disposed three row showers 10 from bottom to top, shower lower end arranges the shower nozzle 11 of lotus shape, top arranges layer 2-3 demist filter screen 12, three row showers 10 are communicated with stock tank district by pipeline and circulating pump, the sidewall in stock tank district are arranged ammoniacal liquor import, and ammoniacal liquor import is connected with ammoniacal liquor device for supplying 13, arrange plasma discharge mouth bottom stock tank district, described plasma discharge mouth is connected with ammonium sulfate recovery system.Described ammonium sulfate recovery system comprises the oxidizing tower 14 be connected successively, evaporimeter 15, cooler crystallizer 16, centrifuge 17 and drier 18, the inlet of oxidizing tower is communicated with the plasma discharge mouth bottom stock tank district by slurry pump, the gas outlet at oxidizing tower top is communicated with flue by escape pipe, the air inlet of oxidizing tower is connected with air separation unit gas outlet, and the gas outlet at oxidizing tower top communicates with ozone generator air inlet.

Air generates a high-concentration oxygen part through air separation unit 9 and enters ozone generator 8, the ozone produced sprays into flue by ozone injection apparatus 6, enter static mixer 7, through static mixer 7 mixed oxidization, the nitrogen oxide of lower valency is oxidized to high-valence state nitrogen oxide soluble in water, enter spray column 4 again, discharged by spray column 4 top after the ammonia scrubbing sprayed out through the nozzle 11 of the shower 10 in spray column 4 and the demist of demist layer, finally entered in air by chimney 5.The ammoniacal liquor of shower ejection, then to be pumped in 2 showers through circulating pump to stock tank district by ammoniacal liquor device for supplying pump.

Air generates high-concentration oxygen another part through air separation unit 9 and is entered by oxidizing tower 14 bottom air inlet, the slurries formed bottom spray column 4 pump into through slurry pump and enter oxidizing tower 14 and fully mix with oxygen, sulfite oxidation becomes ammonium sulfate, to evaporimeter 15, saturated solution is condensed into from solution pump out bottom oxidizing tower 14, cool through cooler crystallizer 16 again and separate out ammonium sulfate and ammonium nitrate crystals, ammonium sulfate after centrifuge 17 is separated and ammonium nitrate crystals again drying device 18 are dry, sulfate of ammoniac and the ammonium nitrate crystallization of the product formation resourcebility utilization of gained are fertile, realize the innoxious of desulphurization denitration product and recycling, be back in ozone generator 8 at oxidizing tower 14 top gas out and again recycle formation ozone, enter flue oxidation flue gas, the clear liquid part that centrifuge 17 is separated is back in evaporimeter 16, and a part is used as the solution of allotment ammoniacal liquor, ensures " zero " discharge of technique waste water.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. a boiler flue gas desulfurization denitrating system, is characterized in that, comprises the boiler, deduster, spray column, flue and the chimney that are connected successively, and the direction along flow of flue gas is successively set on ozone injection apparatus in flue and static mixer; The ozone generator be connected with ozone injection apparatus, the air separation unit be connected with ozone generator, described spray column bottom is stock tank district, middle part equidistant horizontally disposed three row showers from bottom to top, shower lower end arranges the shower nozzle of lotus shape, top arranges multilayer demist layer, three row showers are communicated with stock tank district by pipeline and circulating pump, the sidewall in stock tank district is arranged ammoniacal liquor import, ammoniacal liquor import is connected with ammoniacal liquor device for supplying, arrange plasma discharge mouth bottom stock tank district, described plasma discharge mouth is connected with ammonium sulfate recovery system.
2. a kind of boiler flue gas desulfurization denitrating system according to claim 1, it is characterized in that, described ozone injection apparatus comprises the house steward be connected with ozone generator, the some arms being communicated with described house steward and is vertically set on several nozzles of described arm side, in the vertical spaced set flue of described arm, it is contrary that nozzle opening direction and flue gas carry out flow path direction.
3. a kind of boiler flue gas desulfurization denitrating system according to claim 2, it is characterized in that, described nozzle is arranged on the side of arm equally spacedly.
4. a kind of boiler flue gas desulfurization denitrating system according to claim 1, it is characterized in that, ammonium sulfate recovery system comprises the oxidizing tower be connected successively, evaporimeter, cooler crystallizer, centrifuge and drier, the inlet of oxidizing tower communicates with the plasma discharge mouth bottom stock tank district, the air inlet of oxidizing tower is connected with air separation unit gas outlet, and the gas outlet at oxidizing tower top communicates with ozone generator air inlet.
5. a kind of boiler flue gas removing sulphur denitrating system according to claim 1, it is characterized in that, described demist filter screen is layer 2-3.
CN201510519879.5A 2015-08-21 2015-08-21 Boiler flue gas desulfurization and denitrification system CN105148698A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106115738A (en) * 2016-06-16 2016-11-16 济南冶金化工设备有限公司 Ammonia type flue gas desulfurizing denitration waste liquid enters ammonium sulfate device and produces joint product system

Citations (8)

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CN1589954A (en) * 2003-08-26 2005-03-09 武汉凯迪电力股份有限公司 Dry smoke cleaning process for desulfurizing and denitrating simultaneously and its system
CN101053747A (en) * 2007-04-30 2007-10-17 武汉凯迪电力环保有限公司 Simultaneously desulfurization and denitration wet ammonia flue gas cleaning technology and system thereof
CN102188883A (en) * 2011-04-12 2011-09-21 王晓晔 Novel smoke purification process and device capable of integrally desulphurizing, denitrifying and removing heavy metals
CN102188882A (en) * 2011-04-12 2011-09-21 王晓晔 Integrated method for simultaneously realizing denitrification, desulfurization and heavy metal removal from flue gas, and special equipment suitable for the method
CN102350190A (en) * 2011-06-29 2012-02-15 北京国电清新环保技术股份有限公司 Integrated purification process for desulfurized and denitrified fume and device
CN103752164A (en) * 2014-01-16 2014-04-30 华中科技大学 Limestone-gypsum wet flue gas desulfurization device
CN203790810U (en) * 2014-03-21 2014-08-27 上海东硕环保科技有限公司 Device for simultaneously desulfurizing and denitrifying flue gas by using magnesium oxide according to wet process
CN205055777U (en) * 2015-08-21 2016-03-02 南京白云化工环境监测有限公司 Boiler flue gas desulfurization deNOx systems

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1589954A (en) * 2003-08-26 2005-03-09 武汉凯迪电力股份有限公司 Dry smoke cleaning process for desulfurizing and denitrating simultaneously and its system
CN101053747A (en) * 2007-04-30 2007-10-17 武汉凯迪电力环保有限公司 Simultaneously desulfurization and denitration wet ammonia flue gas cleaning technology and system thereof
CN102188883A (en) * 2011-04-12 2011-09-21 王晓晔 Novel smoke purification process and device capable of integrally desulphurizing, denitrifying and removing heavy metals
CN102188882A (en) * 2011-04-12 2011-09-21 王晓晔 Integrated method for simultaneously realizing denitrification, desulfurization and heavy metal removal from flue gas, and special equipment suitable for the method
CN102350190A (en) * 2011-06-29 2012-02-15 北京国电清新环保技术股份有限公司 Integrated purification process for desulfurized and denitrified fume and device
CN103752164A (en) * 2014-01-16 2014-04-30 华中科技大学 Limestone-gypsum wet flue gas desulfurization device
CN203790810U (en) * 2014-03-21 2014-08-27 上海东硕环保科技有限公司 Device for simultaneously desulfurizing and denitrifying flue gas by using magnesium oxide according to wet process
CN205055777U (en) * 2015-08-21 2016-03-02 南京白云化工环境监测有限公司 Boiler flue gas desulfurization deNOx systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106115738A (en) * 2016-06-16 2016-11-16 济南冶金化工设备有限公司 Ammonia type flue gas desulfurizing denitration waste liquid enters ammonium sulfate device and produces joint product system

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Application publication date: 20151216