CN207056324U - The outer double circulation desulphurization system of tower - Google Patents
The outer double circulation desulphurization system of tower Download PDFInfo
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- CN207056324U CN207056324U CN201720770597.7U CN201720770597U CN207056324U CN 207056324 U CN207056324 U CN 207056324U CN 201720770597 U CN201720770597 U CN 201720770597U CN 207056324 U CN207056324 U CN 207056324U
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Abstract
The application is related to fire coal boiler fume limestone-gypsum wet desulfuration, more particularly to a kind of outer double circulation desulphurization system of tower；It includes the outer low ph value slurry pool of tower body, tower, the outer high ph-values slurry pool of tower；Tower body bottom is provided with smoke inlet, and exhanst gas outlet is provided with the top of tower body；The position between smoke inlet, exhanst gas outlet is corresponded in tower body, is installed with low ph value spraying zone, taper liquid collecting bucket, high ph-values spraying zone and demister successively from bottom to top.Due to implementing above-mentioned technical proposal, the application passes through high ph-values slurry pool outside the low ph value slurry pool outside tower body exterior design tower and tower；Operational effect is directly perceived, it can effectively avoid traditional slurry pool from being located at the easy produced problem of the desulphurization system in absorption tower, such as foaming, overflow, slurries leakage at stirrer seal, reduce desulphurization system fault rate, desulfurizer availability is improved, ensures the normal operation of unit；Ensure to aoxidize abundant and high-efficiency desulfurization, generate the gypsum of high-quality.
Description
Technical field
The application is related to fire coal boiler fume Limestone-gypsum Wet Flue Gas Desulfurization Process, more particularly to a kind of outer double circulation desulphurization of tower
System.
Background technology
In recent years, national environmental protection policy is increasingly strict, and the standard of minimum discharge is proposed to Thermal Power Generation Industry, wherein requiring
The concentration of emission of coal fired boiler of power plant sulfur dioxide in flue gas reaches the discharge standard of gas turbine, i.e. 35mg/Nm3Hereinafter,
Traditional single column single cycle spray desulphurization system is difficult to the requirement for meeting newest standards.
Single column binary cycle system can effectively improve desulfuration efficiency, realize that sulfur dioxide is up to standard under the requirement of minimum discharge standard
Discharge；But its slurry pool is arranged on tower inner bottom part, and operational effect is not directly perceived, this can not just be avoided traditional single column single cycle desulfurization
The easy produced problem of system tower slurry pool, such as foaming, overflow, slurries leakage at stirrer seal, add desulphurization system
Fault rate, desulfurizer availability is reduced, influence the normal operation of unit；And the desulfurization system of slurry pool is set in absorption tower
System, need to be provided with accident slurry pool, before being overhauled on absorption tower, first slurries in tower are vented to accident slurry pool.In addition, at present
Binary cycle system mutually mix, influence each other；PH value in two circulatory systems is caused to fluctuate, be unstable, desulfurization, gypsum
Production technology can not strict control quality.
The content of the invention
The purpose of the application is to propose that a kind of operational effect is directly perceived, effectively avoids foaming, overflow, starches at stirrer seal
The problems such as liquid leaks, the respective independent control of double circulation desulphurization system, desulfurization is efficient, and the outer Two-way Cycle of tower for producing high-quality gypsum takes off
Sulphur system.
What the technical scheme of the application was realized in：The outer double circulation desulphurization system of tower, it includes the outer low ph value of tower body, tower
The outer high ph-values slurry pool of slurry pool, tower；Tower body bottom is provided with smoke inlet, and exhanst gas outlet is provided with the top of tower body；It is corresponding in tower body
Position between smoke inlet, exhanst gas outlet, it is installed with low ph value spraying zone, taper liquid collecting bucket, height successively from bottom to top
PH value spraying zone and demister；The bottom of tower body, low ph value spraying zone are connected with low ph value slurry pool outside tower respectively, high ph-values spray
Leaching area, taper liquid collecting bucket are connected with high ph-values slurry pool outside tower respectively；The outer low ph value slurry pool of tower and the outer high ph-values slurry pool of tower
It is disposed adjacent, the outer low ph value slurry pool of the tower and the outer high ph-values slurry pool of tower are provided with public pool side, the outer high ph-values slurry pool of tower
Interior liquid level is higher than public pool side, and liquid level of the tower outside in low ph value slurry pool is less than public pool side；In the outer low ph value slurry pool of tower
Liquid level be less than the bottom of tower body, the liquid level in the outer high ph-values slurry pool of tower is less than the bottom of taper liquid collecting bucket.
Further, taper liquid collecting bucket is fixedly mounted in the middle part of tower body；Between taper liquid collecting bucket and high ph-values spraying zone,
Both sides in tower body are respectively equipped with a triangle baffle ring；The base of triangle baffle ring is fixed on tower body inwall, the top of triangle baffle ring
Angle is located in the range of the liquid collecting of taper liquid collecting bucket.
Further, taper liquid collecting bucket is provided with porous.
Further, smoke inlet is built up in the side of tower body bottom, and the outer low ph value slurry pool of tower is another with tower body bottom
Side is connected；The bottom of tower body is in high skewed in smoke inlet side.
Further, agitator, the outer high ph-values of tower are equipped with the outer high ph-values slurry pool of tower and the outer low ph value slurry pool of tower
Slurry pool is connected by circulating pump with high ph-values spraying zone, and the bottom of pond of the outer high ph-values slurry pool of tower is connected to outside tower by Pulp pump
The Chi Ding of low ph value slurry pool；The outer low ph value slurry pool of tower is connected by circulating pump with low ph value spraying zone, the outer low ph value slurry of tower
The bottom of pond of liquid pool is connected with gypsum excavationg pump.
Further, the outer high ph-values slurry pool connection of the outer low ph value slurry pool of tower, tower is connected with oxygen blower fan jointly.
Further, low ph value spraying zone sets at least two layers of spraying layer, and high ph-values spraying zone sets at least two layers spray
Layer, every layer of spraying layer set multiple atomizers；Every layer of spraying layer is connected to high ph-values outside corresponding tower by a circulating pump
Slurry pool or the outer low ph value slurry pool of tower.
Due to implementing above-mentioned technical proposal, the application passes through high outside the low ph value slurry pool outside tower body exterior design tower and tower
PH value slurry pool；Operational effect is directly perceived, can effectively avoid traditional slurry pool from being located at what the desulphurization system in absorption tower easily occurred
Problem, such as foaming, overflow, slurries leakage at stirrer seal, reduce desulphurization system fault rate, improving desulfurizer can
With rate, the normal operation of unit is ensured；By taper liquid collecting bucket by two circulatory system independences, high ph-values spraying zone keeps higher
PH value, sulfur dioxide remaining in flue gas is absorbed, relatively low liquid-gas ratio can be ensured, the energy consumption of circulating pump is greatly reduced；Pass through
Public pool side is set up, and ceaselessly low ph value slurry pool supplements the slurries in the outer high ph-values slurry pool of tower to outside tower, maintains relatively low
PH value, ensure to aoxidize abundant and high-efficiency desulfurization, and generate the gypsum of high-quality.
Brief description of the drawings：The concrete structure of the application is provided by following drawings and examples：
Fig. 1 is the schematic diagram of the embodiment of the present application 1 and embodiment 2.
Legend：1. tower body, the outer low ph value slurry pool of 2. towers, the outer high ph-values slurry pool of 3. towers, 4. smoke inlets, 5. flue gases go out
Mouthful, 6. low ph value spraying zones, 7. taper liquid collecting buckets, 8. high ph-values spraying zones, 9. demisters, 10. triangle baffle rings, 11. agitators,
12. gypsum excavationg pump, 13. oxygen blower fans, 14. Pulp pumps, 15. circulating pumps, 16. public pool sides.
Embodiment：
The application is not limited by following embodiments, can be determined specifically with actual conditions according to the technical scheme of the application
Embodiment.
As shown in figure 1, the outer double circulation desulphurization system of tower includes the outer high ph-values slurry of the outer low ph value slurry pool 2 of tower body 1, tower, tower
Liquid pool 3；The bottom of tower body 1 is provided with smoke inlet 4, and the top of tower body 1 is provided with exhanst gas outlet 5；Smoke inlet 4, flue gas are corresponded in tower body 1
Position between outlet 5, is installed with low ph value spraying zone 6, taper liquid collecting bucket 7, high ph-values spraying zone 8 successively from bottom to top
With demister 9；The bottom of tower body 1, low ph value spraying zone 6 are connected with low ph value slurry pool 2 outside tower respectively, high ph-values spraying zone 8,
Taper liquid collecting bucket 7 is connected with high ph-values slurry pool 3 outside tower respectively；The outer low ph value slurry pool 2 of tower and the outer phase of high ph-values slurry pool 3 of tower
Neighbour is set, and the outer low ph value slurry pool 2 of the tower and the outer high ph-values slurry pool 3 of tower are provided with public pool side 16, the outer high ph-values slurries of tower
Liquid level in pond 3 is higher than public pool side 16, and liquid level of the tower outside in low ph value slurry pool 2 is less than public pool side 16；The outer low ph value of tower
Liquid level in slurry pool 2 is less than the bottom of tower body 1, and the liquid level in the outer high ph-values slurry pool 3 of tower is less than the bottom of taper liquid collecting bucket 7
Portion.
In use, fire coal boiler fume enters tower body 1 through inhaling smoke inlet 4, rising contacts with low ph value spraying zone 6 first
Reaction, in flue gas about 90% sulfur dioxide is removed, after taper liquid collecting bucket 7, the flue gas of low sulfur dioxide concentration continues and height
The haptoreaction of pH value spraying zone 8, most discharged afterwards after demister 9 removes fine droplet by exhanst gas outlet 5；Through on probation, desulfurization system
The desulfuration efficiency of system is up to 99%, sulfur dioxide concentration as little as 35mg/Nm in the neat stress after desulfurization3Hereinafter, ultralow row is realized
Put.
The outer low ph value slurry pool 2 of tower, the outer high ph-values slurry pool 3 of tower are each provided at outside tower, and operational effect is directly perceived, can effectively avoid
The easy produced problem of desulphurization system that traditional slurry pool is located in absorption tower, such as slurries leakage at foaming, overflow mechanism sealing
Deng reducing desulphurization system fault rate, improve desulfurizer availability, ensure the normal operation of unit.It need not be set in tower body 1
Vertical slurry pool, the requirement being vented during no maintenance, therefore simplify system, convenient maintenance；Reduce the smoke inlet 4 of tower body 1 simultaneously
Height and total height, so as to reduce serum recycle pump lift, reduce energy consumption；Exhanst gas outlet 5 and the branch for fixed support
Frame height is also corresponding to be reduced, and is reduced cost, is reduced difficulty of construction.
The slurries ceaselessly overflow in low ph value slurry pool 2 to outside tower in the outer high ph-values slurry pool 3 of tower, adjusts low pH outside tower
PH value is 4.5~5.3 in value slurry pool 2, and this process need not supplement lime slurry or need to only fill up a small amount of lime white
Liquid；The SO of flue gas middle and high concentration can be removed2, desulfuration efficiency about 90%, and high-quality gypsum is generated in pond.Taper liquid collecting bucket 7 will
Two circulatory system independences, the two systems in tower body 1 are relatively more stable, will not substantially be formed and influenced each other, high ph-values
Spraying zone 8 is maintained at 5.8~6.4 and ensures that liquid level exceedes public pool side by conveying the lime slurry prepared, adjustment pH value,
The sulfur dioxide of remainder, ensures relatively low liquid-gas ratio in absorbable flue gas, and the outer high ph-values slurry pool side of tower is greatly reduced
Circulating pump energy consumption；Desulfuration efficiency is further improved to 99%, realizes that sulfur dioxide emissioning concentration reaches minimum discharge standard and wanted
Ask.
The application is formed from gypsum according to desulphurization reaction and the different of slurry pH value is required, two slurries are set outside tower body 1
Liquid pool；The control of two cyclic processes is independent, avoids the mutual restriction between parameter, and course of reaction can be made more excellent
Change, rapidly adapt to coal type change and load variations, extra high project is required for high sulfur content flue gas or to desulfuration efficiency
It is well-adapted.
As shown in figure 1, taper liquid collecting bucket 7 is fixedly mounted on the middle part of tower body 1；In taper liquid collecting bucket 7 and high ph-values spraying zone 8
Between, the both sides in tower body 1 are respectively equipped with a triangle baffle ring 10；The base of triangle baffle ring 10 is fixed on the inwall of tower body 1, and three
The drift angle of angle baffle ring 10 is located in the range of the liquid collecting of taper liquid collecting bucket 7；Or/and taper liquid collecting bucket 7 is provided with porous.
The liquid whereabouts of lower ph caused by flue gas and the effect of the slurries of low ph value spraying zone 6 simultaneously passes through the bottom of tower body 1
Portion flows into the outer high ph-values slurry pool 3 of low tower, and a small amount of rising falls after rise after being stopped by triangle baffle ring 10；And flue gas then passes through taper
Liquid collecting bucket 7；Flue gas by the desulfurization of low ph value spraying zone 6 and higher ph caused by the slurries effect of high ph-values spraying zone 8
Liquid, fallen with the flushing water of demister 9, taper liquid collecting bucket 7 is all aggregated under the stop of triangle baffle ring 10 and is entered outside tower
High ph-values slurry pool 3.Porous arrangement can form air film, the reaction in tower body 1 preferably can be divided into two independent loops systems
System, while flue gas flow field can be made evenly, uniform flue gas, desulfuration efficiency is improved, reduce investment and operating cost.
Two sets of circulatory systems are by ingenious separation, the respective independent parameter of formation：It is anti-to be advantageous to oxidation 4.5~5.3 for pH value
Should, improve desulfuration efficiency；The solution absorption process of desulfurizing agent can be ensured, and generate the gypsum of high-quality, therefore allow to use
The desulfurizing agent of inferior quality.PH value 5.8~6.4, consumption can be reduced, it is allowed to use the agstone that particle diameter is larger.So as to reduce
Cost.
As shown in figure 1, smoke inlet 4 is built up in the side of the bottom of tower body 1, the outer low ph value slurry pool 2 of tower and the bottom of tower body 1
Opposite side be connected；The bottom of tower body 1 is in high skewed in the side of smoke inlet 4.
As shown in figure 1, being equipped with agitator 11 in the outer high ph-values slurry pool 3 of tower and the outer low ph value slurry pool 2 of tower, tower is outer high
PH value slurry pool 3 is connected by circulating pump 15 with high ph-values spraying zone 8, and the bottom of pond of the outer high ph-values slurry pool 3 of tower passes through Pulp pump
It is connected to the Chi Ding of the outer low ph value slurry pool 2 of tower；The outer low ph value slurry pool 2 of tower passes through circulating pump 15 and the phase of low ph value spraying zone 6
Even, the bottom of pond of the outer low ph value slurry pool 2 of tower is connected with gypsum excavationg pump 12.
It can so prevent from producing precipitation in pond, be advantageous to oxidation air being uniformly distributed in pond, promote stone by stirring
Cream generates.It is unfavorable for gypsum crystallization because the pH value of high ph-values slurry pool 3 outside tower is higher, thus it is by Pulp pump that bottom of pond is not complete
Holocrystalline gypsum is delivered to the outer low ph value slurry pool 2 of tower, continues oxidation generation high-quality gypsum；Whole gypsum are arranged by gypsum
Go out pump 12 to discharge.
As shown in figure 1, the outer low ph value slurry pool 2 of tower, the outer high ph-values slurry pool 3 of tower connect and are connected with oxygen blower fan jointly
13。
Oxygen blower fan 13 can be provided with two, and one standby setting of a fortune, separate unit air quantity is needed for generation gypsum after full flue gas desulfurization
Oxidation air amount, and according to the desulfurization ratio in high and low pH value slurries area, being passed through the oxidation air of corresponding proportion, to enter tower outer high
The outer low ph value slurry pool 2 of pH value slurry pool 3, tower, the calcium sulfite in pond is carried out to force oxidation generation gypsum.
As shown in figure 1, low ph value spraying zone 6 sets at least two layers of spraying layer, high ph-values spraying zone 8 sets at least two layers spray
Drenching layer, every layer of spraying layer set multiple atomizers；Every layer of spraying layer is connected to high outside corresponding tower by a circulating pump 15
PH value slurry pool 3 or the outer low ph value slurry pool 2 of tower.
Double circulation desulphurization technique, comprises the steps outside the tower made using the application：Step 1：Flue gas is by smoke inlet
4 enter, and the slurries after low ph value spraying zone 6 carries out desulfurization flow to outside tower low ph value slurries outside tower by the road by the bottom of tower body 1
Pond 2, the slurry designs residence time in pond are not less than 4.5 minutes, and pass through the circulating pump being connected corresponding with low ph value spraying zone 6
15 conveyings cycle back to low ph value spraying zone 6；Step 2：Flue gas after a kind of low ph value spraying zone 6 of step is handled rises logical
Cross after taper liquid collecting bucket 7 and carry out desulfurization through high ph-values spraying zone 8 again, the reacted flushing water of slurries and demister 9 falls
Collect at taper liquid collecting bucket 7 and high ph-values slurry pool 3 outside tower is flow to by pipeline, the slurry designs residence time in pond is not less than
2.5 minutes, and high ph-values spraying zone 8 is cycled back to by connected circulating pump 15 corresponding with high ph-values spraying zone 8；Step 3：
Slurries in the outer high ph-values slurry pool 3 of tower, pH value is 5.8 to 6.4, and keeps the liquid level face of lime slurry to be higher than public pool side,
Lime slurry overflow of low ph value slurry pool 2 to outside adjacent tower, it is 4.5 to keep the slurry pH value in the outer low ph value slurry pool 2 of tower
To 5.3；Step 4：Neat stress after desulfurization twice, by being discharged after demister 9 by the exhanst gas outlet 5 at the top of absorption tower.
In step 1 and step 2, sulfur dioxide in flue gas generates calcium sulfite after desulfurization twice, and passes through tower
The bottom of body 1 returns to the outer low ph value slurry pool 2 of tower or returns to high ph-values slurry pool 3 outside tower by taper liquid collecting bucket 7；Oxidation fan is pressed
Respective desulfurization ratio to outside tower low ph value slurry pool 2, high ph-values slurry pool 3 blasts air outside tower；In the outer high ph-values slurry pool 3 of tower
Slurry pH value be 5.8 or 5.9 or 6.0 or 6.1 or 6.2 or 6.3 or 6.4, fouling is avoided under oxidation, and pass through slurry
It is pumped to the outer low ph value slurry pool 2 of tower；Slurry pH value in the outer low ph value slurry pool 2 of tower for 4.5 or 4.6 or 4.7 or 4.8 or
4.9 or 5.0 or 5.1 or 5.2 or 5.3, the abundant oxygen of calcium sulfite produces calcium sulfate, is collected after precipitation by gypsum excavationg pump 12.
As shown in figure 1, the neat stress in step 4, the drop carried by demister 9 is reduced to 75mg/Nm3Afterwards
Discharged by exhanst gas outlet 5.
Above technical characteristic constitutes embodiments herein, and it has stronger adaptability and implementation result, can basis
The inessential technical characteristic of increase and decrease is actually needed, to meet the needs of different situations.
Claims (6)
- A kind of 1. outer double circulation desulphurization system of tower, it is characterised in that：Including high ph-values outside low ph value slurry pool outside tower body, tower, tower Slurry pool；Tower body bottom is provided with smoke inlet, and exhanst gas outlet is provided with the top of tower body；Smoke inlet, exhanst gas outlet are corresponded in tower body Between position, be installed with low ph value spraying zone, taper liquid collecting bucket, high ph-values spraying zone and demisting successively from bottom to top Device；The bottom of tower body, low ph value spraying zone are connected with low ph value slurry pool outside tower respectively, high ph-values spraying zone, taper liquid collecting bucket It is connected respectively with high ph-values slurry pool outside tower；The outer low ph value slurry pool of tower and the outer high ph-values slurry pool of tower are disposed adjacent, the tower The outer high ph-values slurry pool of outer low ph value slurry pool and tower is provided with public pool side, and the liquid level in the outer high ph-values slurry pool of tower is higher than public Pool side, liquid level of the tower outside in low ph value slurry pool are less than public pool side；Liquid level in the outer low ph value slurry pool of tower is less than tower body Bottom, the liquid level in the outer high ph-values slurry pool of tower are less than the bottom of taper liquid collecting bucket.
- 2. the outer double circulation desulphurization system of tower according to claim 1, it is characterised in that：Taper liquid collecting bucket is fixedly mounted on tower In the middle part of body；Between taper liquid collecting bucket and high ph-values spraying zone, the both sides in tower body are respectively equipped with a triangle baffle ring；Triangle is kept off The base of ring is fixed on tower body inwall, and the drift angle of triangle baffle ring is located in the range of the liquid collecting of taper liquid collecting bucket；Or/and taper Liquid collecting bucket is provided with porous.
- 3. the outer double circulation desulphurization system of tower according to claim 1 or 2, it is characterised in that：Smoke inlet is built up in tower body The side of bottom, the outer low ph value slurry pool of tower are connected with the opposite side of tower body bottom；The bottom of tower body is high in smoke inlet side It is skewed.
- 4. the outer double circulation desulphurization system of tower according to claim 1 or 2, it is characterised in that：The outer high ph-values slurry pool of tower and Agitator is equipped with the outer low ph value slurry pool of tower, the outer high ph-values slurry pool of tower is connected by circulating pump with high ph-values spraying zone, The bottom of pond of the outer high ph-values slurry pool of tower is connected to the Chi Ding of low ph value slurry pool outside tower by Pulp pump；The outer low ph value slurry pool of tower It is connected by circulating pump with low ph value spraying zone, the bottom of pond of the outer low ph value slurry pool of tower is connected with gypsum excavationg pump.
- 5. the outer double circulation desulphurization system of tower according to claim 1 or 2, it is characterised in that：The outer low ph value slurry pool of tower, tower Outer high ph-values slurry pool connection is connected with oxygen blower fan jointly.
- 6. the outer double circulation desulphurization system of tower according to claim 1 or 2, it is characterised in that：Low ph value spraying zone set to Few two layers of spraying layer, high ph-values spraying zone set at least two layers of spraying layer, and every layer of spraying layer sets multiple atomizers；Every layer of spray Drenching layer by a circulating pump be connected to corresponding to low ph value slurry pool outside high ph-values slurry pool or tower outside tower.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213776A (en) * | 2017-06-29 | 2017-09-29 | 姜顺民 | The outer double circulation desulphurization system of tower and its sulfur removal technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213776A (en) * | 2017-06-29 | 2017-09-29 | 姜顺民 | The outer double circulation desulphurization system of tower and its sulfur removal technology |
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