CN105013303A - Combined desulfurization, denitration and decarburization device for flue gas - Google Patents
Combined desulfurization, denitration and decarburization device for flue gas Download PDFInfo
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- CN105013303A CN105013303A CN201410169347.9A CN201410169347A CN105013303A CN 105013303 A CN105013303 A CN 105013303A CN 201410169347 A CN201410169347 A CN 201410169347A CN 105013303 A CN105013303 A CN 105013303A
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Abstract
The invention provides a combined desulfurization, denitration and decarburization device for flue gas. The device comprises a flue gas heat exchanger, a pulse corona reactor, a spraying absorber, an ammonia water tank, a water tank, a circulation tank, a crystallization tank and a decarburization device, wherein the flue gas heat exchanger is connected with the pulse corona reactor through a pipeline; the pulse corona reactor is connected with the side bottom of the spraying absorber through a pipeline; the top of the spraying absorber is connected with the decarburization device through a pipeline; the decarburization device is connected with the flue gas heat exchanger; the ammonia water tank and the water tank are connected with the circulation tank respectively; the circulation tank is communicated with the middle part of the spraying absorber; ammonia water is delivered to the middle part of the spraying absorber through a delivery pump; a return pipeline communicated with the circulation tank is arranged at the bottom of the spraying absorber; the circulation tank is further provided with a pipeline communicated with the crystallization tank. According to the device, the aims of desulfurization and denitration are simultaneously fulfilled, operating cost can also be reduced, investment cost can be reduced, and waste is reduced.
Description
Technical field
The present invention relates to a kind of flue gas desulfurization nitre carbon device.
Background technology
Along with the industrialization paces of China are accelerated, atmosphere pollution is also corresponding to be increased the weight of.Research shows, the carbon dioxide of combustion process discharge is the main matter causing greenhouse effects, and SO2, NOx of discharging and fly ash granule are again the main sources causing atmosphere pollution.How eliminating these pollutions is problem demanding prompt solutions.Current flue gas desulfurization, denitration (nitrogen) decarbonization method are varied, but all lay particular emphasis on the fume treatment of simple function, lack the one-stop treatment system technology of efficient system.
Combined desulfurization and denitration technology is the developing direction of smoke gas treatment in recent years.And SO2, NOx harmful in flue gas often exists simultaneously, because de-SO2, de-NOx two catalytic process influence each other, particularly in de-NOx process, due to the existence of SO2, often make catalyst poisoning.Current fume desulfuring and denitrifying integrated technique is ripe not enough, and applicable industryization can't realize completely.
In China, the coal of about 84% is directly burnt, and creates a large amount of SO2, NOx and flue dust, and these pollutants have had a strong impact on human body, the ecosystem and environment, has thus become to the control that SO2 and NOx pollutes the cardinal task being related to national economy.China just started as far back as 04 year the discharge strictly limiting SO2 and NOx, and most of industrial enterprise will be faced with tighten control SO2 and NOx emission problem.The reserved SCR denitration device of installing bring many troubles can to the design of each parts of boiler, and is used alone desulphurization denitration technology, once investment and operating cost high, floor space is large.Therefore, research and develop combined desulfurization and denitration technology and just seem particularly important.
In current global energy, most fossil fuel combustion process can discharge containing sour gas such as SO2, nitrogen oxide (NOx), and they are main components of atmosphere pollution, is also the main matter forming acid rain and photochemical fog.Desulfurization denitration method effective and the most the most frequently used is at present the rear i.e. flue gas desulfurization and denitrification of burning.Coal-fired Power Plant in China desulfur technology is of a great variety, and representative has lime stone---gypsum, rotary spraying and drying method, simply wet constructed, wet-type ammonia, electronic beam method etc.And to denitration, the coal-burning power plant of China adopts low NOx combusting technology mostly, abroad then incorporating selectively catalytic reduction (SCR) technology is relatively many.There is many problems, as lime stone in the technology that the desulphurization denitration of current employing processes separately---and gypsum desulfurization degree only has 90%, and a large amount of sulfate of generation are difficult to process; SCR method is reducing gases with NH3, there is the problems such as transport difficult, secondary pollution and complex process.Therefore, the advantage that even promotes single desulfurization removing nitric technology how is retained and exploitation the technology of simultaneous SO_2 and NO removal and desulfurization and denitrification integral technology can become the focus of Recent study.Desulfurization and denitrification integral technology is just being subject to the pay attention to day by day of various countries.
Desulphurization denitration technology is incorporated in same set of technological process and carries out by integral process, not only realizes the object of simultaneous SO_2 and NO removal, also can save operating cost, reduces cost of investment and reduce refuse to produce.Up to now, the technology reaching the integration of commercial Application scale mainly contains corona method, metal oxide oxidation catalyst method etc. in carbon based material method, Ozonation, electron beam irradiation method, arteries and veins.The method that these technology adopt is that the sulphur in gaseous contaminant and nitrogen are converted into comparatively stable form through series of chemical, as sulfate and nitrate and then industrial utilization.And the novel associating flue gas desulfurization and denitrification decarbonization system design technology that this technology is introduced is exactly premised on Pulse Corona Techology, the high effective flue gas treatment technology obtained after the brand-new system carried out.
Flue gas desulfurization and denitrification integrated technique grows up on flue gas desulfurization technique basis.Compared with independent desulfurization or denitrating technique, in a system, the technique of pick-ups and deliveries has superiority, can reduce system complexity, improves runnability and reduce operating cost.
Summary of the invention
In order to solve the above problem existed in background technology, the invention provides a kind of flue gas combined desulfurization nitre carbon device, desulfurization nitre carbon carries out by this device in set of device, not only realizes the object of simultaneous SO_2 and NO removal, also can save operating cost, reduces cost of investment and reduce refuse to produce.Compared with independent desulfurization or denitrating technique, in a system, the technique of pick-ups and deliveries has superiority, can reduce system complexity, improves runnability and reduce operating cost.
For achieving the above object, the present invention adopts following technical scheme:
A kind of flue gas combined desulfurization nitre carbon device, comprises flue gas heat-exchange unit, pulsed corona reactor, spray absorber, ammonia vessel, tank, circulating slot, crystallization tank and decarbonization device, it is characterized in that,
Flue gas heat-exchange unit is connected with pulsed corona reactor by pipeline, pulsed corona reactor is connected with spray absorber side bottom by pipeline, spray-absorption top of tower is connected with decarbonization device by pipeline, decarbonization device is connected with flue gas heat-exchange unit, ammonia vessel is connected with circulating slot respectively with tank, circulating slot communicates with the middle part of spray absorber, by delivery pump, ammoniacal liquor is transported to the middle part of spray absorber, the bottom of spray absorber is provided with return and communicates with circulating slot, and circulating slot is also provided with the pipeline communicated with crystallization tank;
Described decarbonization device comprises and directly contacts cooling tower, carbon dioxide absorption tower, liquid storage groove, carbon-dioxide regenerating tower, deammoniation tower, ammonia regenerator and carbon dioxide compressor, direct contact cooling tower is connected with carbon dioxide absorption tower by pipeline, the top of carbon dioxide absorption tower is connected with deammoniation tower, be connected with bottom ammonia regenerator by cooler bottom deammoniation tower, ammonia regenerator top is communicated with the upper lateral part of carbon dioxide absorption tower by pipeline, the bottom of carbon dioxide absorption tower is connected with liquid storage groove, pipe branch is provided with bottom liquid storage groove, one connects carbon dioxide absorption tower by pump, another is connected with carbon-dioxide regenerating tower top, carbon-dioxide regenerating tower top is connected with carbon dioxide compressor by cooler and drier, be connected with carbon dioxide absorption tower by pump and cooler bottom carbon-dioxide regenerating tower.
The invention has the beneficial effects as follows:
(1) adopt impulse electric corona plasma technology, this technology is good to the adaptability of flue gas, goes for the flue gas of different component, and can realize maximizing.This technology has the advantages that application is reasonable, stable lastingly, treatment effect is good.
(2) SO in ammonia process wet scrubbing absorption flue gas is adopted
2and NO
x, ammoniacal liquor is to SO
2and NO
xvery high absorptivity can be reached, especially at oxidizability (NO
2/ NO
x) very high NO can be reached when being 50% ~ 60%
xremoval efficiency; Product can obtain the chemical fertilizer with economic benefit after processing further.
(3) adopt freezing ammonia process decarburization, total system absorbent is single, is convenient to operational management.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the structural representation of the decarbonization device in Fig. 1.
Detailed description of the invention
Illustrate that the invention will be further described with detailed description of the invention below in conjunction with accompanying drawing:
Embodiment 1
As shown in Figure 1, a kind of flue gas combined desulfurization nitre carbon device comprises flue gas heat-exchange unit GGH, pulsed corona reactor, spray absorber, ammonia vessel, tank, circulating slot, crystallization tank and decarbonization device, flue gas heat-exchange unit is connected with pulsed corona reactor by pipeline, pulsed corona reactor is connected with spray absorber side bottom by pipeline, spray-absorption top of tower is connected with decarbonization device by pipeline, decarbonization device is connected with flue gas heat-exchange unit, ammonia vessel is connected with circulating slot respectively with tank, circulating slot communicates with the middle part of spray absorber, by delivery pump, ammoniacal liquor is transported to the middle part of spray absorber, the bottom of spray absorber is provided with return and communicates with circulating slot, circulating slot is also provided with the pipeline communicated with crystallization tank.
As shown in Figure 2, described decarbonization device comprises, direct contact cooling tower DCC, carbon dioxide absorption tower liquid storage groove carbon-dioxide regenerating tower, deammoniation tower, ammonia regenerator and carbon dioxide compressor, direct contact cooling tower is connected with carbon dioxide absorption tower by pipeline, the top of carbon dioxide absorption tower is connected with deammoniation tower, be connected with bottom ammonia regenerator by cooler bottom deammoniation tower, ammonia regenerator top is not communicated with on the side of carbon dioxide absorption tower by pipeline, the bottom of carbon dioxide absorption tower is connected with liquid storage groove, pipe branch is provided with bottom liquid storage groove, again carbon dioxide absorption tower is sent into for one by pump, another enters and is connected with carbon-dioxide regenerating tower top, carbon-dioxide regenerating tower top is connected with carbon dioxide compressor by cooler and drier, be connected with carbon dioxide absorption tower by pump and cooler bottom carbon-dioxide regenerating tower.
The technique of this device desulfurization nitre carbon is:
Carry out the flue gas of Self-duster, after cooling tower DCC, first enter pulsed corona reactor, the SO in flue gas
2and NO
xpartially oxidized; After this flue gas enters spray absorber, absorbs the SO in flue gas in absorption tower with ammonia and circulation fluid
2and NO
xgenerate ammonium sulfite, ammonium nilrite and ammonium nitrate; Flue gas after desulphurization denitration enters demist section, makes to be less than 75mg/m containing water smoke amount in flue gas after demist
3; Flue gas after demist enters decarbonization device; Absorbing liquid after desulphurization denitration enters circulating slot, and most of liquid reenters absorption tower through circulating pump and smoke contacts reacts, and a part of liquid is pumped into product through crystallization and generates workshop.
After flue gas desulfurization nitre, through directly contacting radiator (DCC), its temperature is cooled to about 25 DEG C, water at low temperature is sprayed from tower top, and flue gas enters by the bottom of tower, contacts with water at low temperature, and flue gas is cooled, and the most of water in the flue gas stream of condensation.Condensation water collection, in the bottom of DCC, gets back to DCC top of tower by circulating pump after cooling.Because a small amount of moisture is carried under one's arms and loss by flue gas by evaporation, in DCC, therefore add water to make up the cleaning loss of this respect.Before entering absorption tower, the flue gas of discharging from DCC need be cooled to 7 DEG C.
Ammonia solution absorbs CO
2: ammonia solution absorbs CO
2mainly generate carbonic hydroammonium.Cooled flue gas enters bottom carbon dioxide absorption tower, and cooled ammonia solution and carbonic acid ammonia solution enter from tower top.The carbon dioxide absorption amount of absorbing liquid (lean solution) is between 0.33 and 0.67.Lower lean solution load factor and the absorption efficiency of Geng Gao are important two factors of the absorption efficiency determining absorbing liquid.But, reduce carbon dioxide loaded amount in lean solution, the ammonia equilibrium partial pressure in gas can be caused to increase, thus add the volatilization of ammonia in absorbing liquid.It is essential, cooled by condenser to absorbing liquid, control temperature is no more than 10 DEG C.Have two sources in absorption tower refrigeration duty: the reaction of carbon dioxide and ammonia is exothermic reaction, therefore, reaction liberated heat needs to be transferred, to provide a low temperature absorption environment; Carbonic hydroammonium crystalline deposit be an exothermic reaction, liberated heat also needs to be transferred.
Through CO
2after the absorption on absorption tower, rich solution is discharged by bottom absorption tower, and the flue gas after purification escapes and enter the ammonia of deammoniation tower wash-out volatilization by top.Rich solution is delivered to a heat exchanger by delivery pump under 30atm.Slough the ammonia in flue gas: the ammonia in flue gas gas concentration of discharging from top, absorption tower is 500 ~ 3000ppmv, therefore cannot directly be thrown in air.The volatilization of ammonia simultaneously also increases cost.Therefore after absorption tower, need increase deammoniation tower.
Carbon dioxide desorb: carbon dioxide absorbent solution (rich solution) is sent in reservoir by bottom absorption tower, then by being pumped into intersection heat exchanger.In intersection heat exchanger, rich solution is by desorb CO from regenerator
2rear solution (lean solution) heats.In some cases, and the solid ammonium bicarbonate of not all intersection heat exchanger dissolve.In this case, rich solution can be sent to another heat exchanger, sends after all rich solution dissolution of solids into regenerator.
Rich solution has been entered in regenerator by tower top, flows from top to bottom, by the steam heated of reboiler, causes CO
2disengage.The CO of regeneration
2absorbing liquid is cooled to through cooler the top that less than 10 DEG C Posterior circle go back to absorption tower.High CO
2the flue gas of concentration enters compressor and processes after dehydration.Step before this, may need the ammonia in a water scrubber removal flue gas.Carbon dioxide compresses: from regenerator gas out, pressure is 30atm, then compresses with secondary or three stage compression device.
It will be recognized by those skilled in the art, under the prerequisite not departing from protection scope of the present invention, various amendment, change and combination can be carried out to above-mentioned embodiment, and think that this amendment, change and combination are within the scope of originality thought.
Claims (1)
1. a flue gas combined desulfurization nitre carbon device, comprises flue gas heat-exchange unit, pulsed corona reactor, spray absorber, ammonia vessel, tank, circulating slot, crystallization tank and decarbonization device, it is characterized in that,
Flue gas heat-exchange unit is connected with pulsed corona reactor by pipeline, pulsed corona reactor is connected with spray absorber side bottom by pipeline, spray-absorption top of tower is connected with decarbonization device by pipeline, decarbonization device is connected with flue gas heat-exchange unit, ammonia vessel is connected with circulating slot respectively with tank, circulating slot communicates with the middle part of spray absorber, by delivery pump, ammoniacal liquor is transported to the middle part of spray absorber, the bottom of spray absorber is provided with return and communicates with circulating slot, and circulating slot is also provided with the pipeline communicated with crystallization tank;
Described decarbonization device comprises and directly contacts cooling tower, carbon dioxide absorption tower, liquid storage groove, carbon-dioxide regenerating tower, deammoniation tower, ammonia regenerator and carbon dioxide compressor, direct contact cooling tower is connected with carbon dioxide absorption tower by pipeline, the top of carbon dioxide absorption tower is connected with deammoniation tower, be connected with bottom ammonia regenerator by cooler bottom deammoniation tower, ammonia regenerator top is communicated with the upper lateral part of carbon dioxide absorption tower by pipeline, the bottom of carbon dioxide absorption tower is connected with liquid storage groove, pipe branch is provided with bottom liquid storage groove, one connects carbon dioxide absorption tower by pump, another is connected with carbon-dioxide regenerating tower top, carbon-dioxide regenerating tower top is connected with carbon dioxide compressor by cooler and drier, be connected with carbon dioxide absorption tower by pump and cooler bottom carbon-dioxide regenerating tower.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169347.9A CN105013303A (en) | 2014-04-25 | 2014-04-25 | Combined desulfurization, denitration and decarburization device for flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169347.9A CN105013303A (en) | 2014-04-25 | 2014-04-25 | Combined desulfurization, denitration and decarburization device for flue gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215653A (en) * | 2016-09-09 | 2016-12-14 | 北京交通大学 | The device of plasma for desulfurizing flue gas denitration |
| CN108211698A (en) * | 2016-12-14 | 2018-06-29 | 李平 | Coal-fired flue-gas all contaminants level Four cleaning system and method |
| CN114870579A (en) * | 2022-05-16 | 2022-08-09 | 江苏新世纪江南环保股份有限公司 | Method and device for recovering waste heat of ammonia desulphurization and decarbonization system |
| CN114931849A (en) * | 2022-06-09 | 2022-08-23 | 浙江菲达环保科技股份有限公司 | Split type sulphur carbon is wet process desorption device in coordination |
-
2014
- 2014-04-25 CN CN201410169347.9A patent/CN105013303A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215653A (en) * | 2016-09-09 | 2016-12-14 | 北京交通大学 | The device of plasma for desulfurizing flue gas denitration |
| CN108211698A (en) * | 2016-12-14 | 2018-06-29 | 李平 | Coal-fired flue-gas all contaminants level Four cleaning system and method |
| CN114870579A (en) * | 2022-05-16 | 2022-08-09 | 江苏新世纪江南环保股份有限公司 | Method and device for recovering waste heat of ammonia desulphurization and decarbonization system |
| CN114931849A (en) * | 2022-06-09 | 2022-08-23 | 浙江菲达环保科技股份有限公司 | Split type sulphur carbon is wet process desorption device in coordination |
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Application publication date: 20151104 |
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