CN101474529B - Three-circulation three-segment desulfurizing tower for sintered flue gas - Google Patents
Three-circulation three-segment desulfurizing tower for sintered flue gas Download PDFInfo
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- CN101474529B CN101474529B CN200810172021A CN200810172021A CN101474529B CN 101474529 B CN101474529 B CN 101474529B CN 200810172021 A CN200810172021 A CN 200810172021A CN 200810172021 A CN200810172021 A CN 200810172021A CN 101474529 B CN101474529 B CN 101474529B
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Abstract
The invention provides a sintering flue gas ternary cycle three-stage thionizer. The grading absorption is realized by adopting three-stage absorption and strictly controlling the parameters of absorption liquid of each circulation section, thus being capable of guaranteeing that the sintering flue gas has higher SO2 absorptivity, the loss of the ammonia of a system outlet is minimum and ammonium sulfite with higher concentration and hydrogen sulfite ammonium acetate are output, and being beneficial to forming the final product serving as fertilizer to be sold. Finally, the changing waste into valuable of environment treatment is realized by treatment of wastes with processes of wastes against one another, which is line with recycling economy and sustainable development advocated by the nation.
Description
Technical field
The present invention relates to flue gas desulfurization technique, relate to a kind of desulfurizing tower that is applicable to steel enterprise sintering flue gas desulfurization specifically.
Background technology
Along with the fast development of China's economy, the consumption of China's energy also constantly increases, SO
2Also increase the weight of day by day with the pollution level of acid rain, become the important environmental factor of the economic stable coordination development of restriction China.At present, to sinter fume SO
2The control method of discharging mainly contains: (1) low-sulfur raw material is allocated method into; (2) chimney stack dilution discharge; (3) flue gas desulfurization method.Method allocated into by the low-sulfur raw material and the chimney stack dilution discharge all receives the restriction of the energy and policy, and can not fundamentally solve SO
2Pollute, and the control of the sulfur dioxide of China is the dual control of concentration of emission and total emission volumn, therefore, for the basic SO that eliminates
2Pollute and recovery sulphur resource, flue gas desulfurization technique is imperative in the application of sintering plant.
The Japan NKK ammonia process of desulfurization adopts packed tower as the absorption tower, because exhaust gas volumn is very huge, the manufacturing difficulty of tower is more outstanding, and particularly being uniformly distributed with of the absorption liquid of packed tower is a difficult problem.
As shown in Figure 1; Domestic ammonia-ammonium sulfate sulfur removal technology to sinter fume generally adopts conventional single tower, and solution self-loopa at the bottom of the employing tower forms three sections sprays flue gas is carried out desulfurization; The following technology barrier of main existence: under same total inferior salt content, the basicity of solution is got over SO in the high exhaust gas
2Equilibrium concentration is low more, but basicity is high more, and solution surface nitrogen balance dividing potential drop is high more, and the ammonia loss in the tail gas is just big more, influences the utilization rate of ammonia, causes the secondary pollution of ammonia.Contain SO in the circulation fluid under the acid condition
2When the sulfurous acid ammonia of absorption is arranged, also contain a large amount of sulfuric acid and press composition, and sulfuric acid is pressed SO
2Do not have absorbability, therefore cause a large amount of sulfuric acid to participate in idle loop, cause the lot of consumption of circulating pump power, increase the cost of operation, influence desulfurized effect simultaneously, so remove SO in the flue gas by solution
2Loss prevents that ammonia fog colloidal sol from forming is mutual restriction with minimizing ammonia.Conventional in addition single tower directly becomes ammonium sulfate with sulfite oxidation in the desulphurization circulating liquid pool, for guaranteeing to efflux the quality of byproduct, will be ammonium sulfate on the circulation fluid composition.In the absorption liquid to SO
2What play absorption mainly is ammonium sulfite, and the ammonium sulfate composition is to being absorbed with certain inhibitory action, and therefore, single tower has certain influence to desulfuration efficiency.
Summary of the invention
To above-mentioned existing problems, the present invention proposes a kind of three-circulation three-segment desulfurizing tower that is applicable to sintering flue gas desulfurization.
The present invention realizes through following technical scheme:
A kind of three-circulation three-segment desulfurizing tower for sintered flue gas comprises the desulfurization tower body, and the desulfurization tower body is double-deck tower; The flue gas of realization all current equalizer of the collection of even absorption liquid (1) and collecting tank (2) are arranged in the tower; Collecting tank (2) lower space is provided with first spraying layer (3) and second spraying layer (4), and first circulating pump (7) is connected with first spraying layer (3) with desulfurizing tower bottom collecting tank (5) respectively through pipeline, forms one section circulation; Second circulating pump (8) import is connected with two sections circulation storage tanks (12) with desulfurizing tower bottom collecting tank (5) respectively through pipeline; Outlet is connected with second spraying layer (4) through pipeline, forms two sections circulations, and the 3rd circulating pump (9) is connected with the 3rd spraying layer (6) with three sections circulation storage tanks (11) respectively through pipeline; Three sections circulation storage tanks (11) are connected with collecting tank (2) through pipeline, form three sections circulations.
First spraying layer (3) and second spraying layer (4) are positioned at the smoke inlet upside.
The top of the 3rd spraying layer (6) is equipped with mesh mist eliminator (13), in the both sides up and down of mesh mist eliminator (13) water spray system is installed.
Adopt beneficial effect of the present invention to be: adopt three sections absorptions, the parameter realization segmentation absorption through each circulation section absorption liquid of strictness control can guarantee higher SO
2Absorptivity guarantees that the loss of system outlet ammonia reaches minimum, guarantees the ammonium sulfurous and the bisulfite ammonium salt solution of output higher concentration, is beneficial to the formation final products; Finally reach environment protection treating " turning waste into wealth ", meet recycling economy and sustainable development that country advocates through the treatment of wastes with processes of wastes against one another.
Description of drawings
Shown in Figure 1 is conventional reverse spray column sketch map;
Shown in Figure 2 is three-circulation three-segment desulfurizing tower for sintered flue gas sketch map of the present invention;
1, current equalizer; 2, collecting tank; 3, first spraying layer; 4, second spraying layer; 5, bottom collecting tank; 6, the 3rd spraying layer; 7, first circulating pump; 8, second circulating pump; 9, the 3rd circulating pump; 10, the 4th circulating pump; 11, three sections circulation storage tanks; 12, two sections circulation storage tanks; 13, mesh mist eliminator.
The specific embodiment
The present invention proposes a kind of three-circulation three-segment desulfurizing tower for sintered flue gas that is applicable to sinter fume, below provide sketch map, the step of its enforcement is described with reference to Fig. 2:
Desulfurizing tower is double-deck tower; The flue gas of realization all current equalizer of the collection of even absorption liquid (1) and collecting tank (2) are arranged in the tower; Collecting tank (2) lower space is provided with first spraying layer (3) and second spraying layer (4), and first circulating pump (7) is connected with desulfurizing tower bottom collecting tank (5) first spraying layers (3) respectively through pipeline, forms one section circulation; Second circulating pump (8) import is connected with two sections circulation storage tanks (12) with desulfurizing tower bottom collecting tank (5) respectively through pipeline; Outlet is connected with second spraying layer (4) through pipeline, forms two sections circulations, and the 3rd circulating pump (9) is connected with three sections circulation storage tank (11) the 3rd spraying layers (6) respectively through pipeline; Three sections circulation storage tanks (11) are connected with collecting tank (2) through pipeline, form three sections circulations.
Extraneous water for industrial use and ammoniacal liquor are supplied with two sections circulation storage tanks (12) and three sections circulation storage tanks (11) through pipe-line system; After flue gas got into from the desulfurizing tower middle part, the upper strata mixed liquor that first circulating pump (7) extracts in the desulfurizing tower bottom collecting tank (5) carried out the first road circulation desulfurization through first spraying layer (3) in the desulfurizing tower to the spray of the flue gas in the desulfurizing tower; Lower floor's mixed liquor that second circulating pump (8) extracts in the desulfurizing tower bottom collecting tank (5) replenishes ammoniacal liquor after second spraying layer (4) in the desulfurizing tower carries out the second road circulation desulfurization to the spray of the flue gas in the desulfurizing tower through pipeline from two sections circulation storage tanks (12); The ammoniacal liquor that the 3rd circulating pump (9) extracts in three sections circulation storage tanks (11) carries out the 3rd road circulation desulfurization through the 3rd spraying layer (6) in the desulfurizing tower to the spray of the flue gas in the desulfurizing tower; Generate the collecting tank of ammonium sulfite mixed liquor and be back to three sections circulation storage tanks (11) through the desulfurizing tower middle part; Generate the ammonium sulfite mixed liquor, be concentrated to respectively in desulfurizing tower bottom collecting tank (5) and the three sections circulation storage tanks (11).
The circulation storage tank of two different components (two sections circulation storage tanks (12), three sections circulation storage tanks (11)); The bottom collecting tank (5) of desulfurizing tower also serves as a circulation storage tank; Be equivalent to three kinds of different components; Carry out three layers of spray through three circulations, form three sections absorptions, the parameter of controlling each section absorption liquid through strictness makes each section absorption liquid have different processes index: S/C, total inferior salinity g/L, pH value of solution value, basicity titre and density etc.; Both guarantee imonium content higher in the mixed liquor of bottom, helped to improve SO
2Absorptivity and the purity of inferior salt, guarantee that again the top flue gas reduces the ammonia loss through the component of absorption liquid, makes the loss of system outlet ammonia reach minimum.Be further effectively to eliminate ammonia to decrease and aerosol in addition, mesh mist eliminator (13) be installed, water spray system is installed in the both sides up and down of mesh mist eliminator (13) at the top of desulfurizing tower.
Three-circulation three-segment desulfurizing tower for sintered flue gas provided by the invention utilizes the self-produced charking deposed ammonia of iron and steel enterprise or other ammoniacal liquor to handle the SO2 in its sintering machine waste gas, the treatment of wastes with processes of wastes against one another; The absorptivity of SO2 is high, and the loss of system outlet ammonia is low, guarantees the ammonium sulfurous and the bisulfite ammonium salt solution of higher concentration; Reduce the follow-up equipment load; Improve productive rate and quality, help follow-up generation high-quality solid ammonium sulfate, sell as chemical fertilizer; Reduce discharging sulfur dioxide, can bring huge environmental benefit and certain economic benefits.
Claims (2)
1. three-circulation three-segment desulfurizing tower for sintered flue gas; Comprise the desulfurization tower body, it is characterized in that: the desulfurization tower body is double-deck tower, and the flue gas of realization all current equalizer of the collection of even absorption liquid (1) and collecting tank (2) are arranged in the tower; Collecting tank (2) lower space is provided with first spraying layer (3) and second spraying layer (4); And first spraying layer (3) and second spraying layer (4) are positioned at the smoke inlet upside, and flue gas is at first through first spraying layer (3), then through second spraying layer (4); First circulating pump (7) is connected with first spraying layer (3) with desulfurizing tower bottom collecting tank (5) respectively through pipeline, forms one section circulation, and wherein this first circulating pump (7) extracts the upper strata mixed liquor in the desulfurizing tower bottom collecting tank (5); Second circulating pump (8) import is connected with two sections circulation storage tanks (12) with desulfurizing tower bottom collecting tank (5) respectively through pipeline; Outlet is connected with second spraying layer (4) through pipeline; Form two sections circulations, wherein this second circulating pump (8) extracts the lower floor's mixed liquor in the desulfurizing tower bottom collecting tank (5); The 3rd circulating pump (9) is connected with the 3rd spraying layer (6) with three sections circulation storage tanks (11) respectively through pipeline, and three sections circulation storage tanks (11) are connected with collecting tank (2) through pipeline, form three sections circulations.
2. three-circulation three-segment desulfurizing tower for sintered flue gas according to claim 1 is characterized in that: the top of the 3rd spraying layer (6) is equipped with mesh mist eliminator (13), in the both sides up and down of mesh mist eliminator (13) water spray system is installed.
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| CN101474529B true CN101474529B (en) | 2012-10-10 |
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| CN101698134B (en) * | 2009-10-27 | 2012-05-02 | 德阳市南邡再生资源有限公司 | Method for treating sulfur dioxide high temperature tail gas |
| CN102266708B (en) * | 2011-07-15 | 2015-10-14 | 攀钢集团攀枝花钢钒有限公司 | A kind of flue gas desulfurization absorption process |
| CN104353336B (en) * | 2014-11-27 | 2016-08-24 | 山东同源和环境工程有限公司 | A kind of low temperature purifying technique of coke oven stack gases and equipment thereof |
| CN105749704B (en) * | 2016-05-14 | 2017-12-26 | 张波 | A kind of ammonium sulfite desulphurization system and technique |
| CN106422705A (en) * | 2016-11-07 | 2017-02-22 | 大连科林能源工程技术开发有限公司 | Multi-stage fluidized washing and resourceful utilization ultra-low pollutant discharge system for sulfur-containing waste gas |
| CN108392957A (en) * | 2018-02-05 | 2018-08-14 | 郑兴华 | A kind of flue gas desulphurization system |
| CN109675424A (en) * | 2018-11-23 | 2019-04-26 | 宜宾海丰和锐有限公司 | The method and system of reducing substances in carbide slag slurry are removed in carbide slag sulfur removal technology |
| CN111807332B (en) * | 2020-07-09 | 2022-03-01 | 山东绿知源环保工程有限公司 | High-efficiency method and device for preparing sulfuric acid from coking plant desulfurization waste liquid |
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Non-Patent Citations (1)
| Title |
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| 金定强.脱硫除雾器设计.《电力环境保护》.2001,第17卷(第4期),16-17. * |
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