CN100467100C - Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof - Google Patents
Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof Download PDFInfo
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- CN100467100C CN100467100C CNB2007100086799A CN200710008679A CN100467100C CN 100467100 C CN100467100 C CN 100467100C CN B2007100086799 A CNB2007100086799 A CN B2007100086799A CN 200710008679 A CN200710008679 A CN 200710008679A CN 100467100 C CN100467100 C CN 100467100C
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Abstract
The invention relates to a cycle hovering condition dry desulfurization process and the special thionizer thereof. The character of the dry desulfurization process of the invention is in the following steps: (1) the flue gas not purified by the boiler or the combustion equipment is basipetally brought into the venturi segment of the thionizer after passing the flue gas blending bin, and is fully mixed with the desulfurizer in the cavity of the thionizer to do desulfurization reaction after cooling and speedup in the venturi segment. (2) After passing the stable segment and the upper diffuser of the thionizer, on one hand, the flow speed of the flue gas is affected by the sectional area of the diffuser of the thionizer to make the large granule dust and desulfurizer fall back and form internal recycle; on the other hand, the flue gas is discharged after collected at the side outlet at the upper of the thionizer and connecting pipe. (3) The desulfurizer and dust which is not completely reacted after collected by the dust collector comes back to the venturi segment into the desulfurization recycle. The invention is adapted to clean flue gas for the thionizer.
Description
Technical field
The present invention relates to a kind of circulating suspension state dried dry desulfurizing process and special purpose desulfurizing tower thereof.
Background technology
At present, China's atmosphere pollution situation is still very severe, show according to relevant monitoring materials, the whole nation acid rain area of coverage accounts for more than 30% of territory total area, urban air-quality more than 70% is in or surpasses ambient air quality 3 grade standards, and sulfur dioxide still is one of topmost pollution factor that influences atmosphere pollution.According to statistics, China surpasses 10,000,000,000 because of the loss that sulfur dioxide pollution causes every year.Power industry is to use the coal rich and influential family, also is SO
2The discharging rich and influential family.Related data shows, the SO of thermal power plant in 2002
2Discharge capacity accounts for 50% of national total emission volumn; Expecting 2010 will be increased to more than 60%.
It is the requisite measure that reduces the SO2 of thermal power plant discharge capacity that desulfurizer is installed.At present, the method for coal desulfurization mainly is divided into three major types in the world, desulfurization and burning back flue gas desulfurization in promptly coal-fired preceding desulfurization, the combustion process.Developed country's overwhelming majority all adopts burning back desulfurization.The method of burning back flue gas desulfurization is divided into dry method, semidry method and wet method again.Wherein wet fuel gas desulfurizing technology is in the majority.But the investment of wet desulfurizing process, operating cost height, shortcoming such as floor space is big, secondary pollution is serious has seriously restricted the popularization of wet desulphurization, the flue gas desulfurization of inapplicable especially medium small boiler.In recent years, worldwide widely popularize based on the circulating fluid bed flue-gas desulfurizing technology of fluidization principle.
Summary of the invention
The objective of the invention is to provide a kind of circulating suspension state dried dry desulfurizing process and special purpose desulfurizing tower thereof.The present invention not only helps desulfurizing tower and purifies flue gas, and can save the consumption of desulfurizing agent, also can with unreacted completely desulfurizing agent and grit return desulfurizing tower venturi section and enter desulfurization recirculation, thereby improve the clean-up effect of flue gas, to reduce cost.
Dry desulfurizing process of the present invention is characterised in that according to the following steps and carries out:
(1) enters desulfurizing tower venturi section from bottom to top after the not purification flue gas introducing flue gas blending bin with boiler or combustion apparatus discharge, flue gas is by after the cooling of venturi section spray, quickening, and fully mix with the desulfurizing agent of input desulfurizing tower inner chamber, carry out desulphurization reaction.
(2) flue gas is then behind the diffuser on the stable section by desulfurizing tower and desulfurizing tower top, on the one hand, because the sectional area of desulfurizing tower diffuser is greater than the sectional area of other parts of tower body below,, make wherein big grit or desulfurizing agent fall after rise and carry out interior circulation so that flue gas slows down flow velocity; On the other hand, flue gas enters deduster through the outlet of desulfurizing tower top side and tube connector again and carries out discharging after the collection of particle.
(3) desulfurizing agent and grit return desulfurizing tower venturi section and enter desulfurization recirculation the unreacted after deduster is collected completely.
Special purpose desulfurizing tower of the present invention is characterised in that: comprise that lower sides has gas approach, upper portion side wall has the tower body and the deduster that is connected with the tower body exhanst gas outlet through pipeline of exhanst gas outlet, the tower inner structure is the void tower structure, tower body inner chamber to tower body top board is laid with the flue gas blending bin from bottom to top, the venturi section, stable section and outlet diffuser, it is other in order to import mixed flue gas that described flue gas blending bin is positioned at gas approach, its flow area is greater than gas approach, be provided with urgent slag-drip opening at the bottom of the tower, the fresh desulfurizing agent that is provided with spraying layer in the tower and is prepared by the desulfurizing agent preparation system enters port, and the deduster bottom is provided with towards the gleanings transfer passage of desulfurizing tower venturi section.
Remarkable advantage of the present invention is: the one, and the structural design of desulfurizing tower of the present invention can reach the purpose of high-efficiency desulfurization; The 2nd, because the flow area of flue gas blending bin is bigger, so flow velocity reduces after the blending bin of flue gas process flue gas, thereby flue gas is tentatively mixed at this, and because flue gas flow rate reduces, big dust falls to urgent slag-drip opening at the bottom of the desulfurizing tower from the flue gas blending bin in the flue gas, thereby has guaranteed the stable operation of desulfurizing tower; The 3rd, adopt the optimal design of desulfurization ash external circulating system, can save the consumption of desulfurizing agent.
Description of drawings
Fig. 1 is the organigram of desulfurizing tower of the present invention.
The specific embodiment
Dry desulfurizing process of the present invention is characterised in that according to the following steps and carries out:
(1) enters desulfurizing tower 3 venturi sections (comprising venturi straight length 6 and venturi diffuser 19) from bottom to top after the not purification flue gas introducing flue gas blending bin 5 with boiler or combustion apparatus discharge, flue gas is by after the cooling of venturi section spray, quickening, and fully mix with the desulfurizing agent of input desulfurizing tower inner chamber, carry out desulphurization reaction.
(2) flue gas is then behind the diffuser 8 on the stable section 7 by desulfurizing tower and desulfurizing tower top, on the one hand, because the sectional area of desulfurizing tower diffuser is greater than the sectional area of other parts of tower body below,, make wherein big grit or desulfurizing agent fall after rise and carry out interior circulation so that flue gas slows down flow velocity; On the other hand, flue gas enters deduster 4 through the outlet of desulfurizing tower top side and tube connector again and carries out discharging after the collection of particle.
(3) desulfurizing agent and grit return desulfurizing tower venturi section and enter desulfurization recirculation the unreacted after deduster is collected completely.
In order to improve desulfuration efficiency, in desulfurizing tower, be provided with some spraying layers 10 in order to regulate suitable desulfurization reaction temperature, the size droplet diameter≤60um of spraying layer nozzle 12 ejections; Desulfurizing tower bottom is provided with urgent slag-drip opening 9, and desulfurizing agent and grit enter desulfurizing tower venturi section by being positioned at desulfurizing tower both sides and symmetrical transfer passage respectively completely by the fresh desulfurizing agent of desulfurizing agent preparation system 11 preparations and the unreacted after deduster 4 is collected.
Above-mentioned flue gas is by the flow velocity 〉=35m/s of desulfurizing tower venturi section.
Symmetrical transfer passage described in the embodiment of the invention is air flume 13 and 14, the used fluidization air of air flume is a hot-air, be provided with urgent slag-drip opening 9 in the desulfurizing tower bottom, the lime-ash of urgent slag-drip opening is delivered to desulfurizing tower by jet pump 15 and air flume 14 and carries out desulfurization and dedusting recirculation.
Special purpose desulfurizing tower of the present invention is characterised in that: comprise that lower sides has gas approach 1, upper portion side wall has the tower body 3 and the deduster 4 that is connected with the tower body exhanst gas outlet through pipeline 18 of exhanst gas outlet 2, the tower inner structure is the void tower structure, tower body inner chamber to tower body top board is laid with flue gas blending bin 5 from bottom to top, venturi section (comprising venturi straight length 6 and venturi diffuser 19), stable section 7 and outlet diffuser 8, it is other in order to import mixed flue gas that described flue gas blending bin is positioned at gas approach, its flow area is greater than gas approach, be provided with urgent slag-drip opening 9 at the bottom of the tower, the fresh desulfurizing agent that is provided with spraying layer 10 in the tower and is prepared by desulfurizing agent preparation system 11 enters port, and the deduster bottom is provided with towards the gleanings transfer passage of desulfurizing tower venturi section.
Being arranged as of above-mentioned spraying layer: establish 1 layer of spraying layer in the venturi section, the desulfurizing tower stable section is provided with 2～3 layers of spraying layer, spraying layer is made of several nozzles 12, and the gleanings of described fresh desulfurizing agent and deduster is delivered to desulfurizing tower venturi section through air flume 13 and 14 respectively.
When the particle diameter of sorbent particle thing reaches certain degree, the flue gas flow rate of tower is not enough to support desulfurizing agent in the desulfurizing tower, so be provided with urgent slag-drip opening in the desulfurizing tower bottom, urgent slag-drip opening is provided with the transfer pipeline 16 that lime-ash is carried jet pump 15 and led to air flume 14, and the delivery outlet of described air flume is connected with desulfurizing tower.
Fully mix in order to help flue gas, the height of described flue gas blending bin is 1.5～2.0 times of desulfurizing tower inlet flue duct height, and in the flue gas blending bin, be provided with a plurality of right angles deflector 17, on the one hand flue gas is evenly risen, reduce the flue gas dead angle in the desulfurizing tower, guarantee the stable operation of desulfurizing tower, can reduce the drag losses of flue gas on the other hand, thereby reduce the operating cost of desulphurization system.
The height of above-mentioned venturi straight length is 1.5～2.5m, the 14 °≤Φ in inclination angle of venturi diffuser≤26 °, the height h of venturi diffuser 〉=1/4 desulfurization tower height; Described desulfurizing tower outlet diffuser is shaped as the square structure, and the area of the cross section of outlet diffuser is 1.3～1.5 times of desulfurizing tower stable section cross-sectional area; The height of outlet diffuser is 2～2.5 times of desulfurizing tower exhaust pass height.
Technological process of the present invention and operation principle are: the high-temperature flue gas that comes out from boiler or combustion apparatus at first enters flue gas blending bin 5 by gas approach flue 1 and slows down, a plurality of right angles deflector 17 is housed in the flue gas blending bin, bulky grain thing in the high-temperature flue gas is because flue gas flow rate reduces and urgent slag-drip opening 9 places at desulfurizing tower deposit with the effect of impact of deflector, treat urgent slag-drip opening material when rising to certain height, jet pump 15 by urgent slag-drip opening place and air flume 14 are delivered to desulfurizing tower and carry out desulfurization and dedusting recirculation.The top of flue gas blending bin is the venturi straight length 6 of desulfurizing tower, high-temperature flue gas flue gas flow rate herein is greater than 35m/s, flue gas be no more than 300Pa. through the maximum resistance loss of venturi section and consider desulfurizing agent add the implantation site and ground floor spray position is positioned at the venturi section, so the material of venturi section is the anticorrosive anti-wear carbon steel material. flue gas venturi diffuser 19 after supercooling with add the desulfurizing agent of coming in physical-chemical reactions such as strong mass transfer, heat transfer, the SO in the flue gas take place
2, other sour gas and desulfurizing agent (Ca (OH) such as HCl
2) reaction generation CaSO
3.1/2H
2O, CaSO
4Regulate the desulfuration efficiency of the addition control desulphurization system of cooling water, desulfurizing agent in the venturi section; The height of control desulfurizing tower diffuser (h 〉=5m) and angle (14 °≤Φ≤26 °) are controlled the drag losses of venturi section. and flue gas enters desulfurizing tower stable section 7 and carries out the secondary desulfurization after the desulfurization of venturi section, stable section is a column type, is provided with second and third layer spraying layer in stable section.The top of desulfurizing tower is a diffuser 8, diffuser be shaped as square, the sectional area of diffuser is 1.3～1.5 times of stable section sectional area.When flue gas exported diffuser through desulfurizing tower, the big grit of carrying secretly in the flue gas, big sorbent particle thing so can land, caused the interior circulation of the desulfurizing agent of a part because the flow velocity of flue gas reduces under the effect of gravity.Flue gas enters the removal that deduster carries out particle by desulfurizing tower exhaust pass 2 after slowing down through diffuser.
Flue gas is purified completely through behind the deduster 4, and the particle that deduster is collected comprises unreacted desulfurizing agent and grit completely.In order to reduce the addition of fresh desulfurizing agent, the desulfurization ash overwhelming majority that the present invention takes deduster to collect recycles, guarantee that the particle in the desulfurizing tower keeps certain concentration, make between the desulfurizing agent and constantly rub, collide, form again by " fresh desulfurizing agent ", thereby accomplish under the consumption of the desulfurizing agent of minimum, to reach higher desulfuration efficiency.The another one source of desulfurizing agent is the fresh desulfurizing agent by 11 preparations of desulfurizing agent preparation system, keeps the material balance of desulphurization system, makes the scope that maintains a higher calcium sulfur ratio in the desulfurizing tower, thereby reaches higher desulfuration efficiency.
The conveying of the recirculation ash of deduster is carried by air flume 14, and the adding point of recirculation ash is positioned at the venturi straight length.The conveying of fresh desulfurizing agent is also carried by air flume 13, fresh desulfurizing agent add the implantation site be with the recirculation ash add the implantation site symmetry.
Claims (7)
1, a kind of desulfurizing tower that is used for circulating suspension state dried dry desulfurizing process, it is characterized in that: comprise that lower sides has gas approach, upper portion side wall has the tower body and the deduster that is connected with the tower body exhanst gas outlet through pipeline of exhanst gas outlet, the tower inner structure is the void tower structure, tower body inner chamber to tower body top board is laid with the flue gas blending bin from bottom to top, the venturi section, stable section and outlet diffuser, it is other in order to import mixed flue gas that described flue gas blending bin is positioned at gas approach, its flow area is greater than gas approach, be provided with urgent slag-drip opening at the bottom of the tower, the fresh desulfurizing agent that is provided with spraying layer in the tower and is prepared by the desulfurizing agent preparation system enters port, the deduster bottom is provided with towards the gleanings transfer passage of desulfurizing tower venturi section, be provided with urgent slag-drip opening in the desulfurizing tower bottom, urgent slag-drip opening is provided with the transfer pipeline that lime-ash is carried jet pump and led to air flume, the delivery outlet of air flume is connected with desulfurizing tower, the height of flue gas blending bin is 1.5～2.0 times of desulfurizing tower inlet flue duct height, and is provided with a plurality of right angles deflector in the flue gas blending bin.
2, the desulfurizing tower that is used for circulating suspension state dried dry desulfurizing process according to claim 1, it is characterized in that: being arranged as of described spraying layer: establish 1 layer of spraying layer in the venturi section, the desulfurizing tower stable section is provided with 2～3 layers of spraying layer, spraying layer is made of several nozzles, and the gleanings of described fresh desulfurizing agent and deduster is delivered to desulfurizing tower venturi section through air flume respectively.
3, the desulfurizing tower that is used for circulating suspension state dried dry desulfurizing process according to claim 2, it is characterized in that: the height of venturi straight length is 1.5～2.5m, 14 °≤the Φ in inclination angle of venturi diffuser≤26 °, the height h of venturi diffuser 〉=1/4 desulfurization tower height; Described desulfurizing tower outlet diffuser is shaped as the square structure, and the area of the cross section of outlet diffuser is 1.3～1.5 times of desulfurizing tower stable section cross-sectional area; The height of outlet diffuser is 2～2.5 times of desulfurizing tower exhaust pass height.
4, a kind of use dry desulfurizing process of desulfurizing tower according to claim 1 is characterized in that carrying out according to the following steps:
(1) enters desulfurizing tower venturi section from bottom to top after the not purification flue gas introducing flue gas blending bin with boiler or combustion apparatus discharge, flue gas is by after the cooling of venturi section spray, quickening, and fully mix with the desulfurizing agent of input desulfurizing tower inner chamber, carry out desulphurization reaction;
(2) flue gas is then behind the diffuser on the stable section by desulfurizing tower and desulfurizing tower top, on the one hand, because the sectional area of desulfurizing tower diffuser is greater than the sectional area of other parts of tower body below,, make wherein big grit or desulfurizing agent fall after rise and carry out interior circulation so that flue gas slows down flow velocity; On the other hand, flue gas enters deduster through the outlet of desulfurizing tower top side and tube connector again and carries out discharging after the collection of particle;
(3) desulfurizing agent and grit return desulfurizing tower venturi section and enter desulfurization recirculation the unreacted after deduster is collected completely.
5, dry desulfurizing process according to claim 4 is characterized in that: be provided with some spraying layers in order to regulate suitable desulfurization reaction temperature, the size droplet diameter≤60um of spraying layer nozzle ejection in desulfurizing tower; Desulfurizing tower bottom is provided with urgent slag-drip opening, and desulfurizing agent and grit enter desulfurizing tower venturi section by being positioned at desulfurizing tower both sides and symmetrical transfer passage respectively completely by the fresh desulfurizing agent of desulfurizing agent preparation system preparation and the unreacted after deduster is collected.
6, according to claim 4 or 5 described dry desulfurizing process, it is characterized in that: flue gas is by the flow velocity 〉=35m/s of desulfurizing tower venturi section.
7, dry desulfurizing process according to claim 5, it is characterized in that: described symmetrical transfer passage is an air flume, the used fluidization air of air flume is a hot-air, and the lime-ash of urgent slag-drip opening is delivered to desulfurizing tower by jet pump and air flume and carries out desulfurization and dedusting recirculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100086799A CN100467100C (en) | 2007-03-09 | 2007-03-09 | Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100086799A CN100467100C (en) | 2007-03-09 | 2007-03-09 | Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101053763A CN101053763A (en) | 2007-10-17 |
| CN100467100C true CN100467100C (en) | 2009-03-11 |
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|---|---|---|---|
| CNB2007100086799A Expired - Fee Related CN100467100C (en) | 2007-03-09 | 2007-03-09 | Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402019B (en) * | 2008-11-06 | 2012-12-26 | 北京博朗环境工程技术股份有限公司 | Flue gas desulfurization reactor of return current circulating fluidized bed in flow equalizing field |
| CN103816775B (en) * | 2014-02-24 | 2016-04-13 | 重庆大学 | Non-maintaining semi-dry process flue gas desulphurization absorption tower |
| CN109157938A (en) * | 2018-08-18 | 2019-01-08 | 冯静 | A kind of application method for the device being dusted using Venturi effect |
| CN109395507A (en) * | 2018-11-24 | 2019-03-01 | 浙江华康药业股份有限公司 | Dust device for continuously recycling and its recovery method in a kind of sugar alcohol process |
| CN110787603A (en) * | 2019-12-02 | 2020-02-14 | 哈尔滨理工大学 | Efficient boiler flue gas desulfurization equipment |
| CN111249872A (en) * | 2020-02-14 | 2020-06-09 | 山东神华山大能源环境有限公司 | Two-section type circulating fluidized bed desulfurization system and desulfurization process |
| CN111773916B (en) * | 2020-08-13 | 2022-05-27 | 中国石油化工股份有限公司 | Suspension bed flue gas desulfurization device and suspension bed flue gas desulfurization system |
| CN112628781B (en) * | 2020-12-29 | 2022-11-11 | 四川天壹环保科技有限公司 | Dry-type deacidification cooling equipment |
| CN113797741A (en) * | 2021-09-23 | 2021-12-17 | 北京小牛视觉展示有限公司 | Double-area distribution flue gas deacidification method and system |
| CN114870611A (en) * | 2022-05-26 | 2022-08-09 | 广东佳德环保科技有限公司 | Half-dry desulfurization method for flue gas of lithium salt plant |
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