CN205650072U - Dual cycle desulfurization absorption tower - Google Patents

Dual cycle desulfurization absorption tower Download PDF

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Publication number
CN205650072U
CN205650072U CN201620082380.2U CN201620082380U CN205650072U CN 205650072 U CN205650072 U CN 205650072U CN 201620082380 U CN201620082380 U CN 201620082380U CN 205650072 U CN205650072 U CN 205650072U
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absorption tower
tower
slurry
spraying layer
thick liquid
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CN201620082380.2U
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卢作基
丁继成
王高
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Nanjing Environmental Protection Technology Co Ltd Cs
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Nanjing Environmental Protection Technology Co Ltd Cs
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Abstract

The utility model provides a dual cycle desulfurization absorption tower, by down supreme include in proper order absorption tower thick liquid pond, down the return circuit spray layer, defroster, absorption tower thick liquid pond sprays with return circuit down and is equipped with imported flue between the layer, is equipped with exhaust pass above the defroster, thick liquid in the thick liquid pond of absorption tower under via return circuit slurry circulating pump transport that the return circuit sprays the layer under to, still be equipped with oxidation unit outside the thick liquid pond of absorption tower, down the return circuit sprays that from bottom to top still be equipped with liquid collecting hopper between layer and the defroster and last return circuit sprays the layer in proper order, still be equipped with the outer charging box of tower outside the thick liquid pond of absorption tower, the thick liquid of the outer charging box of tower transports supreme return circuit via last return circuit slurry circulating pump and sprays the layer, and the overflow thick liquid of the outer charging box of tower backflows through the pipeline in the thick liquid pond of absorption tower. Adopt this kind of desulfurizing tower, not only can adapt to the desulfurization demand of power plant's minimum discharge now, can also effectively reduce desulfurization system's running cost.

Description

A kind of double circulation desulphurization absorption tower
Technical field
This utility model relates to a kind of environmental protection equipment, is specifically related to a kind of double circulation desulphurization absorption tower.
Background technology
In future 50 years, the electric power energy structure of the China situation based on Thermal generation unit will not change.And SO2Being one of main atmosphere pollution in coal-burning power plant, this will cause air pollution.Nowadays, flue gas desulfurization device has been installed additional substantially to meet standard limit of smog release in domestic thermal power plant.Wherein, wet desulfurization of flue gas by limestone-gypsum method technology most widely used, its desulfuration efficiency is up to more than 98%, and this method has become the prevailing technology of flue gas desulphurization.
In wet desulfurization of flue gas by limestone-gypsum method technique, desulfuration absorbing tower is essentially traditional countercurrent spray tower.This desulfuration absorbing tower structure is as shown in Figure 1, include slurry pool of absorption tower, lower loop spraying layer, demister the most successively, it is provided with inlet flue duct between slurry pool of absorption tower and lower loop spraying layer, demister is arranged over exhaust pass, serosity in slurry pool of absorption tower is transported to lower loop spraying layer via lower loop slurry circulating pump, is additionally provided with oxidation unit outside the serosity of absorption tower.Wherein, the effect of slurry pool is to store desulfurizer slurry, and serosity is made up of limestone, calcium sulfate and calcium sulfite;Constituting smoke absorption district between the spraying layer of slurry pool top to lower loop, flue gas contacts with desulfurization slurry in this region, completes gas-liquid mass transfer removing SO2;Except the region of the demister above the spraying layer of Shi Xia loop, fog-zone constitutes except fog-zone, after this region neat stress is removed entrapped moisture, discharge desulfurizing tower.
In such absorption tower, the desulfurization flow process of flue gas is as follows: the serosity in slurry circulating pump extraction desulphurization tower slurry pool is delivered in the shower above smoke absorption district, serosity is sprayed by after the nozzle atomization on shower, the former flue gas of high temperature (the smokeless heat exchanger: 110 ~ 150 DEG C entered with bottom, uptake zone, have a flue gas heat-exchange unit: 80 ~ 90 DEG C) become counter current contacting, the SO in former flue gas2It is dissolved in sprayed slurry;The SO of liquid phase in slurry pool2With the CaCO dissolved3Serial reaction is occurred to generate CaSO3, CaSO3The air oxidation blasted generates CaSO4;After the atomization slurry counter current contacting of spraying layer, flue gas carries more slurry droplet secretly, most drop separation is removed now by demister in tower, and the flue gas after purification is discharged from tower top outlet flue.
In above process, flue gas desulfurization is by SO in flue gas2Absorption and oxidation realize, and SO2Absorption and oxidation three dominant response processes being then dependent in countercurrent spray tower in serosity occurring realize, be that limestone dissolves reaction, SO respectively2Absorb reaction, CaSO3Generation and oxidation reaction.SO2Absorption reaction be in uptake zone, flue gas completes gas-liquid mass transfer with atomization desulfurization slurry in counter current contacting, and limestone dissolves reaction and CaSO3Generation and oxidation reaction be then to carry out in the slurry pool below uptake zone.In the above-mentioned extent of reaction and tower, the pH value of serosity has substantial connection, and therefore the control of reaction condition directly influences the carrying out of whole desulphurization reaction, but the most thorny be also in the control of reaction condition.Reason is: serosity pH environmental requirement is not quite similar by the reaction of this three class, even conditions each other.The high pH environmental benefits of such as serosity is in SO2Absorption, when pH value reaches 6, serosity is to SO2Assimilation effect optimal;But the low ph conditions of serosity is conducive to limestone to dissolve and CaSO3Oxidation, when slurry pH value less than 3.5 time, oxidation rate and rate of dissolution are high, but now serosity is to SO2Absorption the most extremely difficult.
In sum it can be seen that this kind of desulfurizing tower exists design defect: the setting of single slurry pool certainly will cause the compromise of slurry pH value to be chosen, compacting serosity is to SO2Absorbability, i.e. choosing of pH value is from the dissolving improving limestone serosity and CaSO3Oxidation set out, sacrifice serosity to a certain extent to SO2Maximum absorbance capacity, system desulphurizing ability is restricted.
Enforcement along with the minimum discharge of nationwide coal-burning power plant, high desulfurization rate in order to ensure desulphurization system, the most traditional spray desulfurizing tower can use the measures such as the quantity of increase liquid-gas ratio, increase spraying layer the most in design, but also derive a series of problem: the increase of liquid-gas ratio, flue gas is carried secretly after making gas-to-liquid contact serosity amount increase, " gypsum rain " phenomenon is more easy to occur, and dust content increases;Slurry pool volume and serum recycle amount increase the most accordingly simultaneously, cause circulating pump and oxidation fan power consumption to increase;Spray number of plies increase can cause the lifting of absorption tower height, and the cost and the desulfurization power consumption that ultimately result in desulfurizer increase, and operating cost increases, and this brings heavy operation burden and financial burden to power plant.Therefore, a kind of desulfuration efficiency is sought high, to SO2The adaptable desulfuration absorbing tower of load variations is the most necessary and significant.
Utility model content
Utility model purpose:In order to overcome drawbacks described above, this utility model provides a kind of double circulation desulphurization absorption tower, forms two work closed circuit at various ph values, improves limestone utilization and SO2Removal efficiency.
Technical solutions of the utility model:
nullA kind of double circulation desulphurization absorption tower,Include slurry pool of absorption tower the most successively、Lower loop spraying layer、Demister,It is provided with inlet flue duct between slurry pool of absorption tower and lower loop spraying layer,Demister is arranged over exhaust pass,Serosity in slurry pool of absorption tower is transported to lower loop spraying layer via lower loop slurry circulating pump,Oxidation unit it is additionally provided with outside slurry pool of absorption tower,Liquid collecting bucket (not only collect the serosity of top spray but also flue gas can be made to pass through) and upper loop spraying layer the most also it is sequentially provided with between described lower loop spraying layer and demister,The additional hopper of tower it is additionally provided with outside described slurry pool of absorption tower,The serosity of the additional hopper of tower is transported to upper loop spraying layer via upper loop slurry circulating pump,Slurry pool of absorption tower、Lower loop spraying layer and lower loop slurry circulating pump constitute lower closed circuit,The additional hopper of tower、Upper loop spraying layer and upper loop slurry circulating pump constitute upper closed circuit,The overflow slurry of the additional hopper of tower is backflowed in slurry pool of absorption tower by pipeline,By oxidation unit, air is blasted in slurry pool of absorption tower,Carry out serosity forcing oxidation.
Described upper loop spraying layer is 2 ~ 4 layers.
In described lower closed circuit, the pH value of serosity is 4 ~ 5.In described upper closed circuit, the pH value of serosity is 6 ~ 7.Two closed circuits run under different pH value.
Described demister is two-stage demister, removes the droplet that flue gas carries.Demister is equipped with wash tub pipe and nozzle, and it is rinsed, to avoid demister to block by timing.
Using above technical scheme, after former flue gas enters absorption tower, bottom-up flowing first passes through spray region, lower loop, carries out counter current contacting with the desulfurization absorbent of spray downwards.Every layer of corresponding slurry circulating pump of spray, the bottom slurry of slurry pool of absorption tower (pH is 4 ~ 5) is got to spraying layer by slurry circulating pump.In this region, tentatively remove SO2While, it is possible to reduce flue-gas temperature and make it be rapidly achieved saturated cigarette temperature, HF, the HCl in flue gas can be washed away in the lump simultaneously.CaSO is mainly completed at lower closed circuit3Complete oxidation and CaSO4Generation.
After the pre-washing of lower closed circuit, flue gas from the bottom up, through the guide vane of liquid collecting bucket, continues upwardly into closed circuit, and flue gas is counter current contacting with the atomization slurry of upper loop spraying layer injection.In the case of pH value is 6 ~ 7, owing to serosity contains the CaCO of excess3, buffer capacity is big, the SO in flue gas2Almost all can be absorbed by the atomization slurry of upper loop spraying layer injection and remove, in the range of this cushioning effect makes system be controlled automatically at a stable optimal pH, not with flue gas flow and SO2The change of load and fluctuate.
Beneficial effect:
Compared with prior art this utility model has the advantage that
1. constitute two work closed circuit at various ph values so that SO2Absorption and oxidation reaction can carry out under optimal electrochemical conditions, serosity can complete SO2Large Copacity absorb and CaSO4Complete oxidation generate.The charging spout of uptake zone, top, owing to serosity is in high ph-values, has the strongest buffer capacity, the highest SO can be effectively ensured2Removal efficiency, though SO2Load occurs notable change also not result in the fluctuation of desulfurization degree.In lower slurry pond, absorption tower, the low ph value of serosity is then conducive to dissolving and the CaSO of limestone3Oxidation, is conducive to improving limestone utilization and the purity of Gypsum Fibrosum.
2. upper circulation loop is run under high pH value, and when same desulfurization degree, than conventional counter-current spray column, required liquid-gas ratio is less, decreases the flow of slurry circulating pump.And in slurry pool of absorption tower, the oxidizing condition that Gypsum Fibrosum generates district is good, can effectively reduce the liquid level of slurry pool and the pressure head of oxidation fan.
Therefore, use this kind of desulfurizing tower, be possible not only to adapt to the desulfurization demand of power plant's minimum discharge now, it is also possible to effectively reduce the operating cost of desulphurization system.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing desulfuration absorbing tower.
Fig. 2 is the structural representation on double circulation desulphurization absorption tower of the present utility model;
Wherein: 1, slurry pool of absorption tower;2, oxidation unit;3, inlet flue duct;4, lower loop spraying layer;5, liquid collecting bucket;6, upper loop spraying layer;7, demister;8, exhaust pass;9, upper loop slurry circulating pump;10, the additional hopper of tower;11, lower loop slurry circulating pump.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, this utility model is expanded on further, it should be understood that these embodiments are merely to illustrate this utility model rather than limit scope of the present utility model, after having read this utility model, those skilled in the art all fall within the application claims limited range to the amendment of the various equivalent form of values of the present utility model.
Embodiment 1
nullAs shown in Figure 2,A kind of double circulation desulphurization absorption tower,Include slurry pool of absorption tower 1 the most successively、Lower loop spraying layer 4、Demister 7,It is provided with inlet flue duct 3 between slurry pool of absorption tower 1 and lower loop spraying layer 4,Demister 7 is arranged over exhaust pass 8,Serosity in slurry pool of absorption tower 1 is transported to lower loop spraying layer 4 via lower loop slurry circulating pump 11,Oxidation unit 2 it is additionally provided with outside slurry pool of absorption tower 1,The most also it is sequentially provided with liquid collecting bucket 5(between described lower loop spraying layer 4 and demister 7 not only to collect the serosity of top spray but also flue gas can be made to pass through) and upper loop spraying layer 6,The additional hopper of tower 10 it is additionally provided with outside described slurry pool of absorption tower 1,The serosity of the additional hopper of tower 10 is transported to upper loop spraying layer 6 via upper loop slurry circulating pump 9,Slurry pool of absorption tower 1、Lower loop spraying layer 4 and lower loop slurry circulating pump 11 constitute lower closed circuit,The additional hopper of tower 10、Upper loop spraying layer 6 and upper loop slurry circulating pump 9 constitute upper closed circuit,The overflow slurry of the additional hopper of tower 10 is backflowed in slurry pool of absorption tower 1 by pipeline,Blasted in slurry pool of absorption tower 1 by 2 air of oxidation unit,Carry out serosity forcing oxidation.
Described upper loop spraying layer is 2 ~ 4 layers.
In described lower closed circuit, the pH value of serosity is 4 ~ 5.In described upper closed circuit, the pH value of serosity is 6 ~ 7.Two closed circuits run under different pH value.
Described demister is two-stage demister, removes the droplet that flue gas carries.Demister is equipped with wash tub pipe and nozzle, and it is rinsed, to avoid demister to block by timing.
After former flue gas enters absorption tower, bottom-up flowing first passes through lower loop spraying layer 4, carries out counter current contacting with the desulfurization absorbent of spray downwards, is cooled to saturation temperature.Every layer of corresponding slurry circulating pump of spray, the bottom slurry of slurry pool of absorption tower (pH is 4 ~ 5) is got to spraying layer by slurry circulating pump.The serosity of lower loop spraying layer 4, from slurry pool of absorption tower 1, in lower loop slurry circulating pump 10 delivers to lower loop spraying layer 4, in this region, tentatively removes SO2While, it is possible to reduce flue-gas temperature and make it be rapidly achieved saturated cigarette temperature, HF, the HCl in flue gas can be washed away in the lump simultaneously.CaSO is mainly completed at lower closed circuit3Complete oxidation and CaSO4Generation, the pH value of this district's serosity controls about 4 ~ 5.CaSO3Air required for oxidation is provided by oxidation unit 2.
After the pre-washing of lower closed circuit, flue gas from the bottom up, through the guide vane of liquid collecting bucket 5, continues upwardly into closed circuit, and flue gas is counter current contacting with the atomization slurry of upper loop spraying layer 6 injection.The serosity of upper loop spraying layer 6, from the additional hopper of tower 10, is delivered to uptake zone, top by upper loop slurry circulating pump 9, flows back to the additional hopper of tower 10, so constitute closed circuit after slurry wash flue gas after liquid collecting bucket 5 is collected.In the case of pH value is 6 ~ 7, owing to serosity contains the CaCO of excess3, buffer capacity is big, the SO in flue gas2The atomization slurry that almost can all be sprayed by upper loop spraying layer 6 absorbs and removes, in the range of this cushioning effect makes system be controlled automatically at a stable optimal pH, not with flue gas flow and SO2The change of load and fluctuate.
The overflow slurry of the additional hopper of tower 10 is flowed in slurry pool of absorption tower 1 by pipeline.The new lime stone slurry supplemented can be individually added into the additional hopper of tower 10, it is also possible to is simultaneously introduced in slurry pool of absorption tower 1.
Two-stage demister 7, the slurry droplet carried in removing flue gas are set on top, absorption tower.Two-stage demister 7 is equipped with wash tub pipe and nozzle, and it is rinsed, to avoid demister to block by timing.

Claims (3)

  1. null1. a double circulation desulphurization absorption tower,Include slurry pool of absorption tower (1) the most successively、Lower loop spraying layer (4)、Demister (7),Inlet flue duct (3) it is provided with between slurry pool of absorption tower (1) and lower loop spraying layer (4),Demister (7) is arranged over exhaust pass (8),Serosity in slurry pool of absorption tower (1) is transported to lower loop spraying layer (4) via lower loop slurry circulating pump (11),Oxidation unit (2) it is additionally provided with outside slurry pool of absorption tower (1),It is characterized in that,Liquid collecting bucket (5) and upper loop spraying layer (6) the most also it is sequentially provided with between described lower loop spraying layer (4) and demister (7),The additional hopper of tower (10) it is additionally provided with outside described slurry pool of absorption tower (1),The serosity of the additional hopper of tower (10) is transported to upper loop spraying layer (6) via upper loop slurry circulating pump (9),Slurry pool of absorption tower (1)、Lower loop spraying layer (4) and lower loop slurry circulating pump (11) constitute lower closed circuit,The additional hopper of tower (10)、Closed circuit on upper loop spraying layer (6) and upper loop slurry circulating pump (9) composition,The overflow slurry of the additional hopper of tower (10) is backflowed in slurry pool of absorption tower (1) by pipeline.
  2. A kind of double circulation desulphurization absorption tower the most according to claim 1, it is characterised in that described upper loop spraying layer (6) is 2 ~ 4 layers.
  3. A kind of double circulation desulphurization absorption tower the most according to claim 1, it is characterised in that described demister (7) is two-stage demister.
CN201620082380.2U 2016-01-27 2016-01-27 Dual cycle desulfurization absorption tower Active CN205650072U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106512697A (en) * 2016-11-04 2017-03-22 华电电力科学研究院 Limestone-lime combined flue gas desulfurization device
CN107213776A (en) * 2017-06-29 2017-09-29 姜顺民 The outer double circulation desulphurization system of tower and its sulfur removal technology
CN107469609A (en) * 2017-09-06 2017-12-15 杭州小橙工业设计有限公司 A kind of full-automatic desulphurization system
CN107875819A (en) * 2017-12-15 2018-04-06 河南省正大环境科技咨询工程有限公司 A kind of wet flue gas desulfurization tower
CN107899406A (en) * 2017-11-17 2018-04-13 湖南辰州矿业有限责任公司 A kind of sulfur dioxide flue gas absorption system and its method for administering sulfur dioxide flue gas
CN109499304A (en) * 2018-12-27 2019-03-22 朱敬 The device and technique of sulfur dioxide in a kind of efficient removal coal-fired flue-gas

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106512697A (en) * 2016-11-04 2017-03-22 华电电力科学研究院 Limestone-lime combined flue gas desulfurization device
CN107213776A (en) * 2017-06-29 2017-09-29 姜顺民 The outer double circulation desulphurization system of tower and its sulfur removal technology
CN107469609A (en) * 2017-09-06 2017-12-15 杭州小橙工业设计有限公司 A kind of full-automatic desulphurization system
CN107469609B (en) * 2017-09-06 2019-03-29 秦皇岛市清青环保设备有限公司 A kind of full-automatic desulphurization system
CN107899406A (en) * 2017-11-17 2018-04-13 湖南辰州矿业有限责任公司 A kind of sulfur dioxide flue gas absorption system and its method for administering sulfur dioxide flue gas
CN107875819A (en) * 2017-12-15 2018-04-06 河南省正大环境科技咨询工程有限公司 A kind of wet flue gas desulfurization tower
CN107875819B (en) * 2017-12-15 2024-01-30 辽宁特力环保科技有限公司 Wet flue gas desulfurization tower
CN109499304A (en) * 2018-12-27 2019-03-22 朱敬 The device and technique of sulfur dioxide in a kind of efficient removal coal-fired flue-gas

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CB03 Change of inventor or designer information

Inventor after: Lu Zuoji

Inventor after: Ding Jicheng

Inventor after: Wang Gao

Inventor before: Lu Zuoji

Inventor before: Ding Jicheng

Inventor before: Wang Gao

COR Change of bibliographic data