CN201208546Y - Helical airflow type wet method flue gas desulphurization spraying tower - Google Patents

Helical airflow type wet method flue gas desulphurization spraying tower Download PDF

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Publication number
CN201208546Y
CN201208546Y CNU2008200674678U CN200820067467U CN201208546Y CN 201208546 Y CN201208546 Y CN 201208546Y CN U2008200674678 U CNU2008200674678 U CN U2008200674678U CN 200820067467 U CN200820067467 U CN 200820067467U CN 201208546 Y CN201208546 Y CN 201208546Y
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China
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flue gas
spray column
cylindrical shell
spray
type wet
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CNU2008200674678U
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Chinese (zh)
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朱敬
韩旭
李雄浩
余福胜
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WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL PROTECTION CO Ltd
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WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL PROTECTION CO Ltd
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Abstract

The utility model relates to a spiral airflow type wet flue gas desulfurization spray tower, which comprises a spray tower cylinder body. A flue gas intake passage and a flue gas exit passage which are arranged in a tangential manner are arranged on the spray tower cylinder body; an absorbent serum spray device which sprays upwards is arranged between the flue gas intake passage and the flue gas exit passage; a central cylinder is arranged in the center of the spray tower cylinder body; a flue gas guide plate which has a downward spiral structure is arranged on the central cylinder; a defogger is arranged in the flue gas exit passage of the spray tower cylinder body. The spray tower leads flue gas to enter in from the upper part of the spray tower cylinder body along the tangential direction, do a spiral movement inside the spray tower cylinder body, and move away from the lower part of the spray tower cylinder body along the tangential direction; at the same time, the spray tower upwards sprays limestone serum, so serum fogdrops countercurrent contact with the flue gas which does the spiral movement downwards first and then fall back under the actions of deadweight and flue gas drag force, and then co-current contact with the flue gas, thereby leading sulfur dioxide in the flue gas and limestone serum to take place the fast chemical reaction so as to absorb sulfur dioxide. The spiral airflow type wet flue gas desulfurization spray tower has high desulfurization efficiency, low investment and safe and reliable operation.

Description

The helical airflow type wet method flue gas desulfurization spray column
Technical field
The utility model relates to lime stone-gypsum wet flue gas desulfurizing equipment, refers to a kind of helical airflow type wet method flue gas desulfurization spray column particularly.
Background technology
Acid rain problem is one of global environmental problem of face of mankind nowadays, the coal-fired oxysulfide SO that produces 2Polluting with nitrogen oxide NO is the main protozoa of China's acid rain.Because the energy resource structure of China is based on coal, in China's power industry, thermoelectricity accounts for about 70% of gross generation always, and coal-fired power plant is the first pollution sources of China's atmosphere pollution.Power-plant flue gas polluted to control be the requirement that realizes economic, society, harmonious development, also be performance coal in China reserves advantage, realize the requirement of coal-burning power plant self sustainable development.It is several that tradition coal fired power plant flue gas desulfurization technique generally is divided into wet method, semidry method and dry desulfurization etc., and wherein wet desulphurization technology is used the most extensively.In the wet desulphurization technology, lime stone-gypsum wet flue gas desulfurizing technology is the most ripe, operational reliability is the highest, its principle is that the lime stone suspension slurry that sulfur in smoke is direct and levigate contacts, lime stone slurry and sulfur dioxide are reacted be absorbed, thereby reach the purpose of desulfurization.At the lime stone slurry desulfur technology, the scientific research personnel has formed plurality of devices such as the spray absorber that differs from one another, packed absorber, dual-circulation absorption tower, composite absorption tower so far through research for many years.
At present, the lime stone-gypsum wet flue gas desulfurizing equipment in industrial application mainly is spray absorber.For preventing the generation of phenomenons such as equipment scaling, obstruction, guarantee that flue gas desulphurization system normally moves, the reaction zone of spray absorber generally adopts the hollow-spraying-tower structure, make that flue gas and slurries reversely contact, sulfur in smoke diffusion mass transfer in absorbent slurry, its absorption reaction speed and efficient depend on multiple factors such as the relative velocity, contact area, the time of staying of flue gas and slurries.
In order to guarantee desulfuration efficiency, need flue gas fully to contact with slurries, this just need install equipment such as multilayer spray equipment, multilayer demister in spray column, make flue gas and absorbent slurry droplet guarantee certain time of staying at reaction zone, these factors all can cause the spray column tower body to increase, and cause that absorbent slurry is risen to spray equipment inlet needs from the spray column bottom and consume a large amount of electric energy.And, flue gas in the existing spray column is bottom-up mobile, and the absorbent slurry droplet from up to down sprays, both are 180 ° of counter current contacting states, under the gravity and of the rectified action of absorbent slurry droplet of absorbent slurry droplet to flue gas, the flow resistance of flue gas is very big, needs to be equipped with the bigger booster fan of power.In addition, the cat head of existing spray column adopts the truncated cone-shaped structure, rectangle structure is then adopted in its exhaust pass cross section, and this design and layout consumptive material are a lot of but integral rigidity is not strong, need add a large amount of reinforcement structures at cat head usually, increased the weight of equipment so on the one hand, unfavorable to equipment safety operation, the supporting construction more complicated of tower top outlet flue also is unfavorable for the uniform of flue gas flow field on the other hand, cause the flow of flue gas pressure loss to increase, the equipment operating cost increases.
Summary of the invention
The purpose of this utility model is exactly that a kind of desulfuration efficiency height, equipment investment and operation energy consumption is low and security of operation is reliable and stable helical airflow type wet method flue gas desulfurization spray column will be provided.
For achieving the above object, the helical airflow type wet method flue gas desulfurization spray column that the utility model is designed, comprise the spray column cylindrical shell, the upper and lower of described spray column cylindrical shell is respectively arranged with gas approach passage and exhanst gas outlet passage, the absorbent slurry spray equipment that sprays at least two courses that are arranged in parallel between the gas approach passage of described spray column cylindrical shell and the exhanst gas outlet passage, described absorbent slurry spray equipment links to each other with the slurries pond of spray column cylindrical shell bottommost by each self-corresponding slurry circulating pump; The gas approach passage and the exhanst gas outlet passage of described spray column cylindrical shell are the arranged tangential state; The central authorities of described spray column cylindrical shell are provided with passes through each layer absorbent slurry spray equipment from top to bottom and extends to central tube under the liquid level of slurries pond, and the barrel of described central tube is provided with the smoke deflector of structure drop in the shape of a spiral; Be provided with demister in the exhanst gas outlet passage of described spray column cylindrical shell.
Further, the corresponding one by one cross section slurries reallocation ring triangular in shape that is provided with in the below of above-mentioned each layer absorbent slurry spray equipment to impel the lime stone slurry quadratic distribution, prevents that lime stone slurry from flowing away along the spray column cylinder inboard wall.
Helical airflow type wet method flue gas desulfurization spray column of the present utility model, can guide flue gas enter in the upper tangential of spray column cylindrical shell, in the motion of the internal helicoid of spray column cylindrical shell, leave in the lower tangential of spray column cylindrical shell, this structure can guarantee that flue gas has the flow process of overlength and lower flow resistance in the spray column cylindrical shell, helps sulfur dioxide in flue gas and lime stone slurry fully reacts.And, flue gas import and export passage arranged tangential, simple and reasonable, weight is corresponding to be alleviated, and demister is arranged in the exhanst gas outlet passage, can effectively reduce the height of spray column cylindrical shell, reduces the engineering equipment initial cost.
This shows that the utility model compared with prior art has following outstanding effect:
One, flue gas enters from spray column cylindrical shell upper tangential, flows at spray column cylindrical shell inside spin, not only has less flow of flue gas resistance, can effectively reduce system self energy consumption, and can increase flue gas flow, increases the time of staying of flue gas in tower.Simultaneously, lime stone slurry is by the bottom-up ejection of absorbent slurry spray equipment, and the slurries droplet at first contacts with flue gas adverse current, contacts with the flue gas following current then, and the gas-liquid two-phase contact is more abundant, and the time of staying of slurries droplet in the spray column cylindrical shell is longer.Like this, the reaction of lime stone slurry droplet and flue gas is more abundant, can significantly improve the desulphurizing ability of system.
Its two, demister is arranged in the exhanst gas outlet passage, makes that the absorbent slurry spray equipment be arranged in the spray column cylindrical shell is compact more, can obviously reduce the tower body height, reduces the engineering equipment first cost.And the position design of absorbent slurry spray equipment must be lower, can reduce the lift of the slurry circulating pump that promotes lime stone slurry, thereby reduce the operation power consumption, saves operating cost.
They are three years old, flue gas import and export passage tangentially is connected with the spray column cylindrical shell, its structure is comparatively simple, flue gas more becomes reasonable into and out of the Flow Field Distribution of spray column cylindrical shell, eliminate exhanst gas outlet passage and the irregular connection status on absorption tower and the labyrinth of exhanst gas outlet passage self in the prior art, increased the safe operation ability of equipment.
Description of drawings
Fig. 1 is a kind of main TV structure schematic diagram of helical airflow type wet method flue gas desulfurization spray column;
Fig. 2 is the structure for amplifying schematic diagram of S portion among Fig. 1;
Fig. 3 is the plan structure schematic diagram of Fig. 1;
Fig. 4 is the A-A sectional structure schematic diagram among Fig. 1.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Helical airflow type wet method flue gas desulfurization spray column shown in the figure has a spray column cylindrical shell 3, and the upper and lower of spray column cylindrical shell 3 is respectively arranged with gas approach passage 1 and the exhanst gas outlet passage 5 that is the arranged tangential state.2, three layers of absorbent slurry spray equipment of absorbent slurry spray equipment 2 that spray on three courses that are arranged in parallel between gas approach passage 1 and the exhanst gas outlet passage 5 spray column cylindrical shell 3 inside link to each other with the slurries pond 7 of spray column cylindrical shell 3 bottommosts by each self-corresponding slurry circulating pump 6.The central authorities of spray column cylindrical shell 3 are provided with passes through three layers of absorbent slurry spray equipment 2 from top to bottom and extends to central tube 10 under 7 liquid levels of slurries pond, the barrel of central tube 10 is provided with the smoke deflector 9 of structure drop in the shape of a spiral, to form the passage that the flue gas spiral descends.
The upper end of above-mentioned central tube 10 is concordant with the top of spray column cylindrical shell 3, and the lower end is then stretched into 0.5m place under 7 liquid levels of slurries pond at least.Above-mentioned smoke deflector 9 preferably adopts the segmentation package assembly, and an end of each section smoke deflector 9 closely is connected on the barrel of central tube 10, and then spiral inclination is unsettled downwards for the other end, and its spiral decline angle of inclination is designed to 15~20 °.The plate of each section smoke deflector 9 is wide should not be too big, generally is controlled in the scope of 600~800mm, and width too conference influences the even distribution of lime stone slurry.Leave the gap of 200~300mm between each section smoke deflector 9, smoke deflector 9 both can play the effect of guiding flue gas helical flow like this, the lime stone drop that is attached on central tube 10 and the smoke deflector 9 can be sent into the gas liquid reaction district smoothly again, increase effective contact area of gas-liquid two-phase.
Above-mentioned each layer absorbent slurry spray equipment 2 all have annular be responsible for 20 and some be responsible for the equally distributed arm 22 of 20 radial directions along annular, the annular person in charge 20 stock inlet 21 links to each other by the slurries pond 7 of the slurry circulating pump corresponding with it 6 with spray column cylindrical shell 3 bottommosts, is evenly distributed with several injection directions nozzle 23 up on the arm 22.Design like this can make absorbent slurry spray equipment 2 and the smoke deflector 9 on the central tube 10 arrange compactly more, guarantees the coverage rate of lime stone slurry droplet, and flue gas is contacted with the abundant concurrent-countercurrent of lime stone slurry droplet.
The below of above-mentioned three layers of absorbent slurry spray equipment 2 correspondence one by one is provided with slurries reallocation ring 8.Slurries reallocation ring 8 by up and down two have certain thickness steel plate and be made into annular and be fixed on spray column cylindrical shell 3 inwalls, its cross section is triangular in shape.Slurries reallocation ring 8 preferably is installed in the absorbent slurry spray equipment 2 belows 1.0~1.2m place corresponding with it, its preferable design parameter is: the ramp steel plate of slurries reallocation ring 8 and angle α=45~60 of spray column cylindrical shell 3 inwalls °, the lower inclined plane steel plate of slurries reallocation ring 8 and angle β=75~90 of spray column cylindrical shell 3 inwalls °, the height h=200~300mm of spray column cylindrical shell 3 inwalls is arrived at the top angle of slurries reallocation ring 8.Like this, can the lime stone slurry that flow along spray column cylindrical shell 3 inwalls reasonably be distributed again, increase effective contact area of biphase gas and liquid flow, thereby improve desulfuration efficiency.
Be provided with the above demister 4 of two-stage or two-stage in the exhanst gas outlet passage 5 of above-mentioned spray column cylindrical shell 3, can remove drop entrained in the flue gas on the one hand, can make full use of the space of exhanst gas outlet passage 5 on the other hand, make structure compact more.The slurries droplet of catching in order to ensure demister 4 turns back in the slurries pond 7 smoothly, and exhanst gas outlet passage 5 is acclivitous arranged tangential state.
The course of work of above-mentioned helical airflow type wet method flue gas desulfurization spray column is as follows: the boiler tail flue gas through pre-dust removal process is tangentially entered in the spray column cylindrical shell 3 by gas approach passage 1, under the guiding function of smoke deflector 9, flue gas is made spiral around central tube 10 and is descended mobile, the flow process of flue gas in spray column cylindrical shell 3 is long, has guaranteed the time of staying of flue gas.Meanwhile, the nozzle 23 that slurry circulating pump 6 drives each layer absorbent slurry spray equipment 2 upwards sprays lime stone slurry, flue gas at first with the lime stone slurry droplet counter current contacting of absorbent slurry spray equipment 2 ejection on upper strata, this slurries droplet is in self gravitation effect and flue gas under the drag force effect to the slurries droplet, begin to fall after rising to certain altitude, contact with the flue gas following current again, fully contact through above-mentioned concurrent-countercurrent, help sulfur in smoke and lime stone slurry droplet generation chemical reaction and be absorbed.Flue gas continues the spiral descending motion, contact with the lime stone slurry droplet generation concurrent-countercurrent of the absorbent slurry spray equipment 2 ejections centre, lower floor successively again, form the strong turbulent flow of gas-liquid two-phase, through whole spray zone, sulfur in smoke and lime stone fully react, and the removal efficiency of sulfur dioxide is greater than 95%.Flue gas after the desulfurization enters exhanst gas outlet passage 5 along the tangential direction of spray column cylindrical shell 3, demister 4 in the exhanst gas outlet passage 5 is removed the drop that carries in the flue gas, the drop that captures is back in the slurries pond 7, and clean flue gas is then tangentially discharged from exhanst gas outlet passage 5.

Claims (10)

1. helical airflow type wet method flue gas desulfurization spray column, comprise spray column cylindrical shell (3), the upper and lower of described spray column cylindrical shell (3) is respectively arranged with gas approach passage (1) and exhanst gas outlet passage (5), the absorbent slurry spray equipment (2) that sprays at least two courses that are arranged in parallel between the gas approach passage (1) of described spray column cylindrical shell (3) and the exhanst gas outlet passage (5), described absorbent slurry spray equipment (2) links to each other with the slurries pond (7) of spray column cylindrical shell (3) bottommost by each self-corresponding slurry circulating pump (6), and it is characterized in that: the gas approach passage (1) and the exhanst gas outlet passage (5) of described spray column cylindrical shell (3) are the arranged tangential state; The central authorities of described spray column cylindrical shell (3) are provided with passes through each layer absorbent slurry spray equipment (2) from top to bottom and extends to central tube (10) under the liquid level of slurries pond (7), and the barrel of described central tube (10) is provided with the smoke deflector of structure drop (9) in the shape of a spiral; Be provided with demister (4) in the exhanst gas outlet passage (5) of described spray column cylindrical shell (3).
2. helical airflow type wet method flue gas desulfurization spray column according to claim 1 is characterized in that: the corresponding one by one cross section slurries reallocation rings (8) triangular in shape that are provided with in the below of described each layer absorbent slurry spray equipment (2).
3. helical airflow type wet method flue gas desulfurization spray column according to claim 2, it is characterized in that: described slurries reallocation rings (8) are arranged on absorbent slurry spray equipment (2) below 1.0~1.2m place corresponding with it, the ramp of described slurries reallocation rings (8) and angle α=45~60 of spray column cylindrical shell (3) inwall °, the lower inclined plane of described slurries reallocation rings (8) and angle β=75~90 of spray column cylindrical shell (3) inwall °, the height h=200~300mm of spray column cylindrical shell (3) inwall is arrived at the top angle of described slurries reallocation rings (8).
4. according to claim 1 or 2 or 3 described helical airflow type wet method flue gas desulfurization spray columns, it is characterized in that: described each layer absorbent slurry spray equipment (2) all has annular and is responsible for (20) and some along the annular person in charge equally distributed arm of (20) radial direction (22), the stock inlet (21) that described annular is responsible for (20) links to each other by the slurries pond (7) of the slurry circulating pump corresponding with it (6) with spray column cylindrical shell (3) bottommost, is evenly distributed with several injection directions nozzle (23) up on the described arm (22).
5. according to claim 1 or 2 or 3 described helical airflow type wet method flue gas desulfurization spray columns, it is characterized in that: described smoke deflector (9) adopts the segmentation package assembly, leave the gap of 200~300mm between each section smoke deflector (9), the wide 600~800mm of being of the plate of each section smoke deflector (9), spiral decline angle of inclination are 15~20 °.
6. helical airflow type wet method flue gas desulfurization spray column according to claim 4, it is characterized in that: described smoke deflector (9) adopts the segmentation package assembly, leave the gap of 200~300mm between each section smoke deflector (9), the wide 600~800mm of being of the plate of each section smoke deflector (9), spiral decline angle of inclination are 15~20 °.
7. according to claim 1 or 2 or 3 described helical airflow type wet method flue gas desulfurization spray columns, it is characterized in that: the exhanst gas outlet passage (5) of described spray column cylindrical shell (3) is acclivitous arranged tangential state.
8. helical airflow type wet method flue gas desulfurization spray column according to claim 4 is characterized in that: the exhanst gas outlet passage (5) of described spray column cylindrical shell (3) is acclivitous arranged tangential state.
9. helical airflow type wet method flue gas desulfurization spray column according to claim 5 is characterized in that: the exhanst gas outlet passage (5) of described spray column cylindrical shell (3) is acclivitous arranged tangential state.
10. helical airflow type wet method flue gas desulfurization spray column according to claim 6 is characterized in that: the exhanst gas outlet passage (5) of described spray column cylindrical shell (3) is acclivitous arranged tangential state.
CNU2008200674678U 2008-05-29 2008-05-29 Helical airflow type wet method flue gas desulphurization spraying tower Expired - Lifetime CN201208546Y (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670489A (en) * 2017-11-02 2018-02-09 山东三融环保工程有限公司 A kind of desulfuration absorbing tower with tower wall baffle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670489A (en) * 2017-11-02 2018-02-09 山东三融环保工程有限公司 A kind of desulfuration absorbing tower with tower wall baffle

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Granted publication date: 20090318