CN102059052A - Method for integrally desulphurizing, denitrating and dedusting flue gas by double-nozzle rectangular spouted bed - Google Patents
Method for integrally desulphurizing, denitrating and dedusting flue gas by double-nozzle rectangular spouted bed Download PDFInfo
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- CN102059052A CN102059052A CN 201010516588 CN201010516588A CN102059052A CN 102059052 A CN102059052 A CN 102059052A CN 201010516588 CN201010516588 CN 201010516588 CN 201010516588 A CN201010516588 A CN 201010516588A CN 102059052 A CN102059052 A CN 102059052A
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Abstract
The invention provides a method for integrally desulphurizing, denitrating and dedusting a flue gas by a double-nozzle rectangular spouted bed, which comprises the following steps of: adding inert solid particles into the double-nozzle rectangular spouted bed, introducing the flue gas containing sulfur dioxide, nitric oxides and dust from double nozzles, making the particles in the bed reach a stable spouted state, starting a sludge liquor pump to convey the aqueous solution of ammonia, spouting the aqueous solution of ammonia from an atomizing nozzle at a certain height above the bed, spraying liquid droplets onto the spouted particles in a spray form to adhere a part of dust onto the spouted particles at the same time of reacting the liquid droplets with the sulfur dioxide and the nitric oxides, and realizing gas-solid separation in a high-efficiency deduster in a way that solid reaction products drop in the collision of the particles and the desulphurized and denitrated flue gas is dried and carried out of the spouted bed. The method has the advantages of device compactness, system simplicity, less investment, low running cost and the like, easily realizes large-scale operations, simultaneously increases the contact area of the reactants due to the addition of the spouted particles, improves the desulphurization and denitration efficiency, and can be widely applied in the fields of energy, chemical industry, metallurgy and the like.
Description
Technical field
The present invention relates to the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting, belong to the energy, chemical industry, field of metallurgy.
Background technology
In industry production processes such as non-ferrous metal metallurgy, coal combustion, can produce a large amount of flue gases that contains sulfur dioxide, nitrogen oxide and dust, sulfur dioxide, nitrogen oxide are to cause atmosphere pollution, produce acid rain, and the main source of photochemical pollution, very harmful, and little, the light weight of dust density, be difficult to reclaim, so the discharging of these flue gases has had a strong impact on the development of daily life and natural, ecological.
In recent years, the desulfurization and denitrification integral technical development is rapid, and exploitation or improved method have tens kinds.Wherein urea wet absorption method has certain development potentiality, and it is to be that absorbent removes sulfur in smoke, nitrogen oxide simultaneously with urea in liquid phase, but its reacted discharging species contain carbon dioxide, do not meet the low-carbon environment-friendly standard.SCR, SNCR technology as the gas cleaning mode, because its higher NOx extrusion rate, obtaining application more and more widely, but the SCR technology is because its expensive catalysts and life problems have caused investment excessive, limited its extensive use, relatively cheap SNCR technology also exists certain difficulty in force, and main difficulty is how to reduce the leakage of ammonia and how determines optimum problems such as ammoniacal liquor straying quatity at present.
In nineteen nineties, the scientific research personnel of Japan utilizes spouted bed heat and mass efficient height, the advantage that fluidizability is good has been invented powder particle-spouted bed, utilize powder particle-spouted bed to carry out the semi-dry process flue gas desulphurization denitration, this technology is used ammoniacal liquor as desulphurization denitration reagent, the discharging of no industrial wastewater, except that chemical fertilizer ammonium sulfate, there is not waste sludge discharge substantially yet, device is compact, system is simple, floor space is little, investment and operating cost are low, there are not advantages such as secondary pollution, so be particularly suitable for the flue gas denitration of middle and small burn coal boiler, but upward there is certain difficulty in the spouted bed of the conventional post taper that this technology adopts owing to maximized by being limited in of ratio of height to diameter.
Summary of the invention
The objective of the invention is to, a kind of operating cost is low, desulfuration efficiency is high, denitrification effect is remarkable for the fume emission enterprise of containing a large amount of sulfur dioxide, nitrogen oxide and dust provides, the flue gas desulfurization denitration dust-removing integrated method that environmental pollution is little.
Purpose of the present invention realizes by following approach:
In the spouted bed of two spout rectangles, add inert solid particle earlier, introducing flue gas by two spouts makes an endoparticle reach the stabilize spout state, open slush pump again and carry ammonia spirit, solution is by the atomizer ejection that is placed in certain altitude place, bed top, drop is vaporific and is sprayed on the spouted particle, when reacting with sulfur dioxide, nitrogen oxide, also the part dust adhesion in the flue gas on spouted particle.Reacted solid product comes off in the collision of particle, takes spouted bed out of behind the flue gas drying behind the desulphurization denitration, and realize gas solid separation in high-efficiency dust remover.
The described pair of spouted bed of spout rectangle should comprise at least: plural spout, rectangular bed body, atomizer and high-efficiency dust remover.Spout is positioned at the bottom of spouted bed, is the bed body of rectangle more than the spout, in bed body inside, along the above certain altitude of each spout center line place atomizer is installed, and high-efficiency dust remover is installed on bed body top.
Described inert solid particle will have good spouted performance, wearing and tearing to spouted bed are little, be difficult for broken, do not react with flue gas and ammoniacal liquor, diameter is between 1～8mm, in spouted bed, realize that the solid particle loading height was decided according to the desulfurization and denitrification reaction time under the condition of stabilize spout.
Described gas approach temperature is 70～180 ℃, is higher than 5～25 ℃ of body inside, and the flue gas apparent velocity is (1.05～1.7) U in bed
Ms, U
MsBe the spouted speed of minimum.
The method of described a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral, it is characterized in that: described ammonia spirit is selected 2～10% ammonia spirit for use.Simultaneously, as a kind of optionally embodiment, can add the acid of cushioning effect in the ammonia spirit, as additives such as triethanolamine, ethylenediamines, additive concentration is 0.005%～0.025% of an ammonia spirit.
Described atomizer installation site should be decided according to the endocorpuscular spouted height of bed, should guarantee that slurries evenly are sprayed on the particle, guarantees that again half wet stock is fully dry, avoids the generation of wall sticking phenomenon, and spray woods density is at 0.2～2.5m
3/ (m
2H) between.
The present invention compared with prior art exists tangible advantage to be:
(1) device is compact, system is simple, floor space is little, and desulfurization, denitration and dust removal process can carry out in same set of equipment; (2) investment and operating cost low, do not have a secondary pollution; (3) add spouted particle, it is long-pending to have increased the reaction contact surface, helps the utilization rate of the removal efficiency and the ammoniacal liquor of sulfur dioxide and nitrogen oxide; (4) dust adhesion that density is little in the flue gas helps improving efficiency of dust collection on the big reactant of density; (5) two spout rectangular configuration help industrial large-sized equalization.
Description of drawings
Accompanying drawing is the schematic flow sheet of a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting method;
The specific embodiment
Also describe the present invention in conjunction with the accompanying drawings in detail below by specific embodiment.
Referring to accompanying drawing, spouted bed bottom is provided with two spouts, adopts the rectangular bed body, and two atomizers are installed along the above certain altitude of each spout center line place, is provided with high-efficiency dust remover on bed body top.The corundum in granules that in the spouted bed of two spout rectangles, adds 2mm earlier, introducing flue gas by two spouts makes an endoparticle reach the stabilize spout state, open slush pump again and carry ammoniacal liquor, slurries are sprayed by atomizer, drop is vaporific and is sprayed on the spouted particle, when reacting with sulfur dioxide, oxides of nitrogen gas, also the part dust adhesion in the flue gas on the spouted particle.Reacted solid product comes off in the collision of particle, be desulfurized with denitrogenation after flue gas drying after take spouted bed out of, and in high-efficiency dust remover, realize gas solid separation.The gas approach temperature is 130 ℃, be higher than inner 12 ℃ an of body, the flue gas apparent velocity is 0.68～0.75m/s in bed, desulphurization denitration reagent is selected 2～10% ammonia spirit for use, and added the acid of cushioning effect, triethanolamine and ethylenediamine additive, additive concentration are 0.005%～0.025% of ammonia spirit.The spray woods density of atomizer is 1.0m
3/ (m
2H).
Adopt method provided by the invention, desulfuration efficiency can remain on more than 85%, and holder is imitated efficient and reached more than 70%, and under the suitable situation of operating condition, desulfuration efficiency can reach 90%.
It should be noted that at last: above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. two spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral method, it is characterized in that: in the spouted bed of two spout rectangles, add inert solid particle earlier, introducing flue gas by two spouts makes an endoparticle reach the stabilize spout state, open slush pump again and carry ammonia spirit, slurries are by the atomizer ejection that is placed in certain altitude place, bed top, drop is vaporific and is sprayed on the spouted particle, when reacting with sulfur dioxide, nitrogen oxide, also the part dust adhesion in the flue gas on spouted particle.Reacted solid product comes off in the collision of particle, takes spouted bed out of behind the flue gas drying after desulfurization, the denitration, and realize gas solid separation in high-efficiency dust remover.
2. the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral according to claim 1 is characterized in that: the described pair of spouted bed of spout rectangle should comprise at least: plural spout, rectangular bed body, atomizer and high-efficiency dust remover.Spout is positioned at the bottom of spouted bed, is the bed body of rectangle more than the spout, in bed body inside, along the above certain altitude of each spout center line place atomizer is installed, and high-efficiency dust remover is installed on bed body top.
3. the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral according to claim 1, it is characterized in that: described inert solid particle will have good spouted performance, wearing and tearing to spouted bed are little, be difficult for broken, do not react with flue gas and ammonia spirit, diameter is between 1～8mm, and in spouted bed under the condition of realization stabilize spout, the solid particle loading height is decided according to desulfurization, denitration reaction time.
4. the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral according to claim 1, it is characterized in that: described gas approach temperature is 70～180 ℃, be higher than 5～25 ℃ of body inside, the flue gas apparent velocity is (1.05～1.7) U in bed
Ms, U
MsBe the spouted speed of minimum.
5. the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral according to claim 1, it is characterized in that: described ammonia spirit is selected 2～10% ammonia spirit for use.Simultaneously, as a kind of optionally embodiment, can add the acid of cushioning effect in the ammonia spirit, as additives such as triethanolamine, ethylenediamines, additive concentration is 0.005%～0.025% of an ammonia spirit.
6. the method for a kind of pair of spout rectangle jetting bed flue gas desulfurization denitration dust collecting integral according to claim 1, it is characterized in that: described atomizer installation site should be decided according to the endocorpuscular spouted height of bed, should guarantee that slurries evenly are sprayed on the particle, guarantee that again half wet stock is fully dry, avoid the generation of wall sticking phenomenon, spray woods density is at 0.2～2.5m
3/ (m
2H) between.
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| CN 201010516588 CN102059052A (en) | 2010-10-22 | 2010-10-22 | Method for integrally desulphurizing, denitrating and dedusting flue gas by double-nozzle rectangular spouted bed |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976747A (en) * | 1975-06-06 | 1976-08-24 | The United States Of America As Represented By The United States Energy Research And Development Administration | Modified dry limestone process for control of sulfur dioxide emissions |
| CN1382516A (en) * | 2001-04-28 | 2002-12-04 | 清华大学 | A circulating fluidized bed process for cleaning fume by adding iron ash and its equipment |
| CN101716460A (en) * | 2009-12-18 | 2010-06-02 | 哈尔滨工业大学 | Composite spouted flue gas purification method based on pollutant combined removal |
| CN101757847A (en) * | 2010-01-26 | 2010-06-30 | 于良河 | Method for recovering ammonium sulfate from waste ammonia by desulfurization and denitrification and device |
| CN101780369A (en) * | 2009-12-28 | 2010-07-21 | 天津人婕减排工程有限公司 | Multi-jet rectangle spouted bed flue gas desulfurization dedusting method |
-
2010
- 2010-10-22 CN CN 201010516588 patent/CN102059052A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976747A (en) * | 1975-06-06 | 1976-08-24 | The United States Of America As Represented By The United States Energy Research And Development Administration | Modified dry limestone process for control of sulfur dioxide emissions |
| CN1382516A (en) * | 2001-04-28 | 2002-12-04 | 清华大学 | A circulating fluidized bed process for cleaning fume by adding iron ash and its equipment |
| CN101716460A (en) * | 2009-12-18 | 2010-06-02 | 哈尔滨工业大学 | Composite spouted flue gas purification method based on pollutant combined removal |
| CN101780369A (en) * | 2009-12-28 | 2010-07-21 | 天津人婕减排工程有限公司 | Multi-jet rectangle spouted bed flue gas desulfurization dedusting method |
| CN101757847A (en) * | 2010-01-26 | 2010-06-30 | 于良河 | Method for recovering ammonium sulfate from waste ammonia by desulfurization and denitrification and device |
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Application publication date: 20110518 |