CN104174282A - Two-stage high-speed desulfurization system and process - Google Patents
Two-stage high-speed desulfurization system and process Download PDFInfo
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- CN104174282A CN104174282A CN201410449582.1A CN201410449582A CN104174282A CN 104174282 A CN104174282 A CN 104174282A CN 201410449582 A CN201410449582 A CN 201410449582A CN 104174282 A CN104174282 A CN 104174282A
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Abstract
The invention discloses a two-stage high-speed desulfurization system which comprises a pretreatment tower with a flue gas inlet and a desulfurization tower with a flue gas outlet, wherein a precycling desulfurization area and a cycling desulfurization area are respectively formed in the pretreatment tower and the desulfurization tower; the precycling desulfurization area is communicated with the cycling desulfurization area; and a slurry pool is arranged below the cycling desulfurization area in a communicated mode and is communicated with the precycling desulfurization area. According to the two-stage desulfurization system, the conventional flue is fully utilized, pre-desulfurization treatment is performed through high-speed desulfurization, and further desulfurization is realized through a second-stage desulfurization system, so that the second-stage desulfurization absorption resistance is reduced, and the operating resistance and construction cost of a single-tower desulfurization absorption tower are reduced. According to the two-stage high-speed desulfurization process, the desulfurization efficiency can be up to 99 percent, and compared with a traditional single-tower desulfurization system, the construction cost can be saved by about 20 percent, and the operating cost is reduced by over 30 percent.
Description
Technical field
The present invention relates to a kind of flue gas desulfurization technique, two-stage type high-speed desulfuration system and technique thereof that particularly a kind of wet desulphurization is processed.
Background technology
At present, the most of desulphurization systems of China have all adopted limestone-gypsum method, and its removing process is mainly to adopt lime stone slurry as reactant, and sprays into desulfurizing tower by spray system, Ta Nei and anti-biochemical reaction of sulfur dioxide in flue gas, thereby reach the object that removes sulfur dioxide.Spraying layer in tower is generally arranged 3-5 layer, and along with increasing of spraying layer, the construction of desulfurizing tower and operating cost all present the state of rapid growth.Along with the application of desulphurization system is more and more extensive, various novel sulfur removal technologies and desulfuration absorbing tower have been there is.Improved to a certain extent the absorption efficiency of desulfurizing tower, but all less than two advantages of significantly investing and operating cost is all saved.This has also affected the promotion and application of these technology to a certain extent.
The U-shaped tower desulphurization system that circulates and technique (2012103227516) patent of invention disclose the U-shaped tower desulphurization system of a kind of two circulation and technique, the present invention arranges slurries divider wall in the slurry pool of U-shaped desulfurizing tower, slurry pool is divided in front circulation and oxidation pond and rear circulation in and oxidation pond, separate front circulation desulfurization district He Hou circulation desulfurization district is set simultaneously, in front circulation and oxidation pond, circulation desulfurization system before the common formation in front circulating pump He Qian circulation desulfurization district, in rear circulation and oxidation pond, circulation desulfurization system after the common formation in rear circulating pump He Hou circulation desulfurization district, in a U-shaped desulfurizing tower, form relatively independent double circulation desulphurization system, the desulfurization of flue gas is completed jointly by double circulation desulphurization system, this system desulfuration efficiency can reach more than 99%, but due to double tower and binary cycle system being set, cost of investment is higher, super single tower nearly 40%.Though have some superiority on desulfuration efficiency, cost of investment is higher.
The single tower desulphurization system of two circulations and technique (2012102878577) the invention discloses the single tower desulphurization system of a kind of two circulation and technique; By drip tray is set in desulfurizing tower, desulfurization zone is divided into upper and lower circulation desulfurization district, in lower circulation desulfurization district, lower circulation and oxidation pond and lower circulating pump are common forms lower circulation desulfurization system, in cocycle desulfurization zone, cocycle and oxidation pond and cocycle pump jointly form cocycle desulphurization system, in a desulfurizing tower, form relatively independent double circulation desulphurization system, the desulfurization of flue gas is completed jointly by double circulation desulphurization system.Though the double circulation desulphurization system phase integral arrangement of this invention has reduced occupation of land, has saved investment, because its absorption tower height increase causes its operating cost higher, and has certain operation
A kind of efficient desulfurization spray tower (2014100233891) discloses a kind of efficient desulfurization spray tower, comprise spray column, spray system and slurry pool, described spray column is provided with air inlet and gas outlet, spray system is positioned at spray column, described spray system comprises water main, the first shower, the second shower and the 3rd shower, described the first shower, the second shower and the 3rd shower are all connected with water main, on the first shower, the second shower and the 3rd shower, some shower nozzles are all installed, described slurry pool is positioned at the below of spray system.This sulfur removal technology by arranging further desulfurization SO2 of Wet type electric dust-removing device after desulfurization, there is good desulfuration efficiency, but its investment and operating cost all more traditional sulfur removal technology nearly double, and therefore, at environmental protection standard, require its economy of normal region to be subject to certain constraint.
The form of desulfuration absorbing tower is more at present, but mostly can not take into account investment and operating cost, and the composite factor of desulfuration efficiency, so in practical application, has all occurred that a determining cause is difficult.
Therefore, need a kind of novel two-stage type high-speed desulfuration absorption tower system, can effectively reduce investment and operating cost, improve the efficiency of desulphurization system, and be suitable for the transformation of traditional desulfurizer.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of two-stage type high-speed desulfuration system and technique thereof, two-stage type desulphurization system is set, and make full use of existing flue, by high-speed desulfuration, reach pre-desulfurization, by two-grade desulfurizing system, reach further desulfurization again, thereby reduce two-grade desulfurizing, absorb resistance, reduce running resistance and the construction cost of single tower desulfuration absorbing tower.
A kind of two-stage type high-speed desulfuration system of the present invention, comprise the pretreater that is provided with gas approach and the desulfurizing tower that is provided with exhanst gas outlet, in described pretreater and in desulfurizing tower, be respectively arranged with pre-circulation desulfurization district and circulation desulfurization district, described pre-circulation desulfurization district is communicated with setting with circulation desulfurization district, and slurry pool connection is arranged at Bing Yuyu circulation desulfurization district, below, circulation desulfurization district and is communicated with setting;
Further, below, described pre-circulation desulfurization district is provided with slurry collecting groove, described slurry collecting groove is communicated with setting with slurry pool, top is provided with and can carries out rectification and the slurries that decline be carried out to the drainage set of drain flue gas in described slurry collecting groove, and described gas approach is communicated with setting with the slurry collecting groove of drainage set bottom;
Further, described pre-circulation desulfurization district top is provided with the guiding device that flue gas is carried out to rectification, and described desulfurizing tower wall is provided with and is beneficial to the flue that makes to enter through the flue gas in pre-circulation desulfurization district circulation desulfurization district, at the entrance of flue, flushing water system is set;
Further, described guiding device consists of a plurality of circular arc type deflectors that are longitudinally all distributed in top, pre-circulation desulfurization district, and described flushing water system consists of a plurality of showers, and described flue is the downward tilting structure of outlet;
Further, described pre-circulation desulfurization district and circulation desulfurization district are provided with spray equipment, and described slurry pool is communicated with respectively pre-circulation desulfurization district and slurry collecting groove and circulation desulfurization district by circulating pump;
Further, the spraying layer of described spray equipment for being formed by shower, top, described circulation desulfurization district is provided with demister;
Further, the spraying layer in described pre-circulation desulfurization district is 1-3 floor and the whole multiple exit structural formula circulating pump that is communicated with, and the spraying layer in circulation desulfurization district is that 3-4 floor and every layer arrange a circulating pump respectively;
Further, in described slurry pool, be provided with slurries oxidation unit, described slurries oxidation unit and the oxidation air system connectivity that circulates and provide oxygen to carry out oxidation reaction.
The present invention also discloses a kind of sulfur removal technology of two-stage type high-speed desulfuration system, comprises pre-sulfur removal technology and sulfur removal technology, specifically comprises the following steps:
From smoke inlet to pretreater, passing at a high speed flue gas the desulfurization slurry that pre-circulation desulfurization district is recycled pump and provides is provided after drainage set carries out rectification carries out the desulfurization pretreatment of absorbing and removing SO2, desulfurization slurry falls into slurry collecting groove after absorbing SO2, slurries in feeder are circulated to slurry pool by free convection or pump, the desulfurization slurry that the circulation desulfurization district that enters desulfurizing tower through the pretreated flue gas of desulfurization after guiding device carries out rectification is recycled pump to be provided carries out the secondary desulfuration of absorbing and removing SO2 to be processed, on clean flue gas after processing after the demister on desulfurizing tower is removed large drop qualified discharge, from the exhanst gas outlet of desulfurizing tower, discharge.
Further, flue gas flow rate in pretreater is 5-15m/s, and liquid gas volume ratio is 2-10, and in desulfurizing tower, flue gas flow rate is 3-5m/s, absorbing the desulfurization slurry falling in slurry pool after SO2 provides oxygen to carry out oxidation reaction through cyclic oxidation air system, generates sulfate crystallization.
Beneficial effect of the present invention: two-stage type high-speed desulfuration system of the present invention and technique thereof, two-stage type desulphurization system is set, and make full use of existing flue, by high-speed desulfuration, reaching pre-desulfurization processes, by two-grade desulfurizing system, reach further desulfurization again, thereby reduce two-grade desulfurizing, absorb resistance, reduce running resistance and the construction cost of single tower desulfuration absorbing tower.This two-stage high-speed desulfuration technique can reach 99% desulfuration efficiency, and more traditional single tower desulphurization system can be saved construction cost approximately 20%, reduces operating cost and surpasses 30%.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is structural representation of the present invention.
The specific embodiment
Fig. 1 is structural representation of the present invention, as shown in the figure: a kind of two-stage type high-speed desulfuration system of the present invention, comprise the pretreater 1 that is provided with gas approach 11 and the desulfurizing tower 2 that is provided with exhanst gas outlet 21, in described pretreater 1 with in desulfurizing tower 2, be respectively arranged with pre-circulation desulfurization district 12He circulation desulfurization district 22, described pre-circulation desulfurization district 12Yu circulation desulfurization district 22 is communicated with setting, and slurry pool connection is arranged at 22 Bing Yuyu circulation desulfurization districts, below 12, circulation desulfurization district and is communicated with setting; Desulphurization system mainly comprises separate two-stage type desulfurization, leading portion is pre-desulfurization, back segment is two-grade desulfurizing, make full use of existing flue, by high-speed desulfuration, reach pre-desulfurization, then reach further desulfurization by two-grade desulfurizing system, thereby reduce two-grade desulfurizing and absorb resistance, reduce the running resistance of single tower desulfuration absorbing tower, both guaranteed higher desulfuration efficiency, reduced again slurries internal circulating load and system energy consumption.
In the present embodiment, 12 belows, described pre-circulation desulfurization district are provided with slurry collecting groove 13, and described slurry collecting groove 13 is communicated with setting with slurry pool 23; Slurry collecting groove is directly communicated with and arranges or force to be communicated with by pump with slurry pool; The interior top of described slurry collecting groove 13 is provided with and can carries out rectification and the slurries that decline be carried out to the drainage set 14 of drain flue gas, and described gas approach 11 is communicated with setting with the slurry collecting groove 13 of drainage set 14 bottoms; Flue gas enters slurry collecting groove 13 from gas approach 11 and then carries out pre-desulfurization in Zhi Yu circulation desulfurization district 12, the circulation desulfurization district 22 that enters desulfurizing tower 2 after pre-desulfurization carries out secondary desulfuration, whole system only has a slurry pool 23 to supply with desulfurization slurry, and be arranged in the desulfurizing tower 2 of two-grade desulfurizing, in the pretreater 1 of pre-desulfurization, do not establish slurry pool 23, reducing the construction costs.Slurries in slurry collecting groove 13 are circulated to the slurry pool 23 in the desulfurizing tower 2 of two-grade desulfurizing by free convection or pump.Drainage set 14 is to be the advection of directionality by disorderly air-flow or the arrangement of liquid stream, make velocity of flue gas be evenly distributed simultaneously, eliminate the flue gas low regime in tower, it is fully contacted with desulfurization slurry, reaction is balanced, improve desulfuration efficiency, in prior art, this structure has a lot, as tool flow-guiding screen, or the opening up circular arc type structure that equidistantly distributes and form by a plurality of arc deflectors, be provided with kuppe (being similar to the kuppe of soy bean milk making machine) of fair water cone etc., be preferably 1/4 circular arc, as long as can reach, disorderly air-flow or liquid stream is arranged and just can realize object of the present invention for the advection of directionality.
In the present embodiment, 12 tops, described pre-circulation desulfurization district are provided with the guiding device 15 that flue gas is carried out to water conservancy diversion, described desulfurizing tower 2 walls are provided with for making to enter through the flue gas in pre-circulation desulfurization district 12 flue 17 in circulation desulfurization district 22, at the entrance of flue 17, flushing water system 16 are set; It is the advection of directionality that 15 pairs of the guiding devices of the water conservancy diversion in pre-circulation desulfurization district 12 arrange disorderly air-flow, makes velocity of flue gas be evenly distributed simultaneously.
In the present embodiment, described guiding device 15 consists of a plurality of circular arc type passages that are longitudinally all distributed in 12 tops, pre-circulation desulfurization district; Avoid the generation of smooth segregation phenomenon, eliminate low regime, be preferably 1/4 circular arc type bend; Described flushing water system 16 consists of a plurality of showers; In case the fouling of grouting liquid, described flue 17 is the downward tilting structure of outlet; Angle of inclination is 5-15 degree, is convenient to flue gas through pre-desulfurization and with certain speed, enters desulfurizing tower 2 and carry out secondary desulfuration.
In the present embodiment, described pre-circulation desulfurization district 12He circulation desulfurization district is provided with slurries spray equipment 18, and described slurry pool 23 is communicated with respectively pre-circulation desulfurization district 12 and slurry collecting groove 13 and circulation desulfurization 22nd district by circulating pump; Slurry pool 23 obtains from slurry collecting groove 13 by circulating pump, and the slurries in pretreater 1 are recycled to the slurry pool 23 that is positioned at circulation desulfurization district 12 after collecting by slurry collecting groove 13.The doctor solution for pre-circulation desulfurization district 12He circulation desulfurization district 22 is supplied with respectively and reclaimed to slurry pool 23, and a pond is multiplex, saves financial cost.
In the present embodiment, the spraying layer of described spray equipment 18 for being formed by shower, 22 tops, described circulation desulfurization district are provided with demister 23; The shower nozzle of shower all adopts air atomizing shower nozzle, can make the slurries in spray equipment 18 fully contact with the sulfur-containing smoke gas in tower, improves desulfuration efficiency; Demister 23 can be dull and stereotyped or chevron shaped fixed board-like demister 23, can be also other forms such as combination of wet electrical dust precipitator or fixed board-like demister 23 and wet electrical dust precipitator.
In the present embodiment, the spraying layer in described pre-circulation desulfurization district 12 is 1-3 floor and the whole multiple exit structural formula circulating pump 19 that is communicated with; By control valve, control uninterrupted; The spraying layer in circulation desulfurization district is that 3-4 floor and every layer are communicated with a circulating pump 24 respectively.
In the present embodiment, in described slurry pool 23, be provided with slurries oxidation unit, described slurries oxidation unit and the oxidation air system connectivity that circulates and provide oxygen to carry out oxidation reaction, desulfurization slurry provides oxygen to carry out oxidation reaction by cyclic oxidation air system, generates sulfate crystallization; Absorbing the desulfurization slurry falling in rear circulation and oxidation pond after SO2 provides oxygen to carry out oxidation reaction by rear cyclic oxidation air system, generates sulfate.
The present invention also discloses a kind of sulfur removal technology of two-stage type high-speed desulfuration system, comprises pre-sulfur removal technology and sulfur removal technology, specifically comprises the following steps:
From smoke inlet to pretreater 1, passing at a high speed flue gas the desulfurization slurry that pre-circulation desulfurization district 12 is recycled pump and provides is provided after drainage set 14 carries out rectification carries out the desulfurization pretreatment of absorbing and removing SO2, desulfurization slurry falls into slurry collecting groove 13 after absorbing SO2, slurries in feeder are circulated to slurry pool 23 by free convection or pump, the desulfurization slurry that the circulation desulfurization district 22 that enters desulfurizing tower 2 through the pretreated flue gas of desulfurization after guiding device 15 carries out rectification is recycled pump to be provided carries out the secondary desulfuration of absorbing and removing SO2 to be processed, on clean flue gas after processing after the demister 23 on desulfurizing tower 2 is removed large drop qualified discharge, from the exhanst gas outlet 21 of desulfurizing tower 2, discharge.
In the present embodiment, flue gas flow rate in pretreater 1 is 5-15m/s, and liquid gas volume ratio is 2-10, and the interior flue gas flow rate of desulfurizing tower 2 is 3-5m/s, absorbing the desulfurization slurry falling in slurry pool 23 after SO2 provides oxygen to carry out oxidation reaction through cyclic oxidation air system, generates sulfate crystallization.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a two-stage type high-speed desulfuration system, it is characterized in that: comprise the pretreater that is provided with gas approach and the desulfurizing tower that is provided with exhanst gas outlet, in described pretreater and in desulfurizing tower, be respectively arranged with pre-circulation desulfurization district and circulation desulfurization district, described pre-circulation desulfurization district is communicated with setting with circulation desulfurization district, and slurry pool connection is arranged at Bing Yuyu circulation desulfurization district, below, circulation desulfurization district and is communicated with setting.
2. two-stage type high-speed desulfuration system according to claim 1, it is characterized in that: below, described pre-circulation desulfurization district is provided with slurry collecting groove, described slurry collecting groove is communicated with setting with slurry pool, top is provided with and can carries out rectification and the slurries that decline be carried out to the drainage set of drain flue gas in described slurry collecting groove, and described gas approach is communicated with setting with the slurry collecting groove of drainage set bottom.
3. two-stage type high-speed desulfuration system according to claim 1, it is characterized in that: top, described pre-circulation desulfurization district is provided with the guiding device that flue gas is carried out to water conservancy diversion, described desulfurizing tower wall is provided with and is beneficial to the flue that makes to enter through the flue gas in pre-circulation desulfurization district circulation desulfurization district, at the entrance of flue, flushing water system is set.
4. two-stage type high-speed desulfuration system according to claim 3, it is characterized in that: described guiding device consists of a plurality of circular arc type deflectors that are longitudinally all distributed in top, pre-circulation desulfurization district, described flushing water system consists of a plurality of showers, and described flue is the downward tilting structure of outlet.
5. two-stage type high-speed desulfuration system according to claim 1, it is characterized in that: described pre-circulation desulfurization district and circulation desulfurization district are provided with slurries spray equipment, described slurry pool is communicated with respectively pre-circulation desulfurization district and slurry collecting groove and circulation desulfurization district by circulating pump.
6. two-stage type high-speed desulfuration system according to claim 5, is characterized in that: the spraying layer of described spray equipment for being comprised of shower, top, described circulation desulfurization district is provided with demister.
7. two-stage type high-speed desulfuration system according to claim 6, it is characterized in that: the spraying layer in described pre-circulation desulfurization district is 1-3 floor and the whole multiple exit structural formula circulating pump that is communicated with, the spraying layer in circulation desulfurization district is that 3-4 floor and every layer arrange a circulating pump respectively.
8. two-stage type high-speed desulfuration system according to claim 1, is characterized in that: in described slurry pool, be provided with slurries oxidation unit, described slurries oxidation unit and the oxidation air system connectivity that circulates and provide oxygen to carry out oxidation reaction.
9. according to the sulfur removal technology of the two-stage type high-speed desulfuration system described in claim 1-8 any one, it is characterized in that: comprise pre-sulfur removal technology and sulfur removal technology, specifically comprise the following steps:
From smoke inlet to pretreater, passing at a high speed flue gas the desulfurization slurry that pre-circulation desulfurization district is recycled pump and provides is provided after drainage set carries out rectification carries out the desulfurization pretreatment of absorbing and removing SO2, desulfurization slurry falls into slurry collecting groove after absorbing SO2, slurries in feeder are circulated to slurry pool by free convection or pump, the desulfurization slurry that the circulation desulfurization district that enters desulfurizing tower through the pretreated flue gas of desulfurization after guiding device carries out rectification is recycled pump to be provided carries out the secondary desulfuration of absorbing and removing SO2 to be processed, on clean flue gas after processing after the demister on desulfurizing tower is removed large drop qualified discharge, from the exhanst gas outlet of desulfurizing tower, discharge.
10. the sulfur removal technology of two-stage type high-speed desulfuration system according to claim 9, it is characterized in that: the flue gas flow rate in pretreater is 5-15m/s, liquid gas volume ratio is 2-10, in desulfurizing tower, flue gas flow rate is 3-5m/s, absorbing the desulfurization slurry falling in slurry pool after SO2 provides oxygen to carry out oxidation reaction through cyclic oxidation air system, generates sulfate crystallization.
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| CN104815547A (en) * | 2015-04-09 | 2015-08-05 | 瓮福（集团）有限责任公司 | Phosphate concentrate desulfurization system |
| CN105750254A (en) * | 2016-04-15 | 2016-07-13 | 佛山赛因迪环保科技有限公司 | Method and apparatus for preventing dust accumulation of flue gas inlet duct of adsorption tower |
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| CN101670231A (en) * | 2009-07-23 | 2010-03-17 | 刘荣甫 | Device and process for converting calcium process desulfurization into temperature difference crystallizing ammonia process desulfurization |
| CN203108431U (en) * | 2013-03-26 | 2013-08-07 | 中国大唐集团环境技术有限公司 | Double-step flue gas desulfurization tower |
| CN204017661U (en) * | 2014-09-05 | 2014-12-17 | 中电投远达环保工程有限公司 | Two-stage type high-speed desulfuration system |
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| CN101670231A (en) * | 2009-07-23 | 2010-03-17 | 刘荣甫 | Device and process for converting calcium process desulfurization into temperature difference crystallizing ammonia process desulfurization |
| CN203108431U (en) * | 2013-03-26 | 2013-08-07 | 中国大唐集团环境技术有限公司 | Double-step flue gas desulfurization tower |
| CN204017661U (en) * | 2014-09-05 | 2014-12-17 | 中电投远达环保工程有限公司 | Two-stage type high-speed desulfuration system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104815547A (en) * | 2015-04-09 | 2015-08-05 | 瓮福（集团）有限责任公司 | Phosphate concentrate desulfurization system |
| CN105750254A (en) * | 2016-04-15 | 2016-07-13 | 佛山赛因迪环保科技有限公司 | Method and apparatus for preventing dust accumulation of flue gas inlet duct of adsorption tower |
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Application publication date: 20141203 |