CN100431673C - Method and equipment for neutralizing acidic water after desulfurization of coal burning gas - Google Patents
Method and equipment for neutralizing acidic water after desulfurization of coal burning gas Download PDFInfo
- Publication number
- CN100431673C CN100431673C CNB2005100475251A CN200510047525A CN100431673C CN 100431673 C CN100431673 C CN 100431673C CN B2005100475251 A CNB2005100475251 A CN B2005100475251A CN 200510047525 A CN200510047525 A CN 200510047525A CN 100431673 C CN100431673 C CN 100431673C
- Authority
- CN
- China
- Prior art keywords
- water
- neutralization pond
- neutralization
- ash
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for neutralizing smoke desulfuration acid water, and relative device. Wherein, it uses ash water slag water as the desulfuration medium of boiler; the desulfurated acid water is neutralized by alkali mineral; it uses neutralize pool filled with block lime stone or raw magnesite, as alkali material. The invention has simple process and low cost.
Description
Technical field
The present invention relates to a kind of acidic water after desulfurization of coal burning gas neutralization method and equipment, belong to environmental improvement method and commercial plant field, be applicable to the acid water neutralisation treatment, especially a kind of with neutralization method and the equipment of ash wash slag water as the coal burning flue gas desulfurization absorption liquid.
Background technology
The problem that the fire coal boiler fume wet desulfurizing process all exists absorption liquid to use back acidity to raise has restricted recycling and qualified discharge of absorption liquid.Usually, absorption liquid all needs to prepare in the alkaline slurry and acid water in the wet desulphurization, with the limestone-gypsum method is example, for the neutralization reaction of implementing absorption liquid with recycle, in it and process comprise: lime stone storage, fragmentation, abrasive dust, screening, slurrying, spray absorption, gypsum revolve links such as branch, mummification, accumulating and wastewater treatment, relate to well imagining more than the number of devices.Above-mentioned technology all needs links such as alkaline agent preparation, slurrying, conveying, product mummification, wastewater treatment and product accumulating, shortcoming such as have that technological process is long, table of equipment (cover) quantity is many, occupation of land is big, investment is big, operating cost is high and the product quantity of slag is big.In the limestone-gypsum method, because the solvability of lime stone is very low, sometimes need add some additives, the ammonium ion of 500～7500ppm is proposed to add in the flue gas desulphurization system that with the lime stone is absorbent as US5630991, improve the rate of dissolution of lime stone, US5693301 proposes a kind of lime that adds weak organic acid or lime stone slurry flue gas desulphurization system etc. of containing.But these methods do not solve the above-mentioned deficiency of limestone-gypsum method, have also increased operating cost.
" Liaoning urban and rural environment science and technology " the 23rd volume the 4th phase 45～47 pages of " are the wet scrubber desulfurization at water source with boiler flushing cinder water " of being introduced, in the flushing cinder profit, add alkaline matters such as acetylene slag, adopt Venturi tube-granite duster, in dedusting, reach desulfurized effect." transformation of fire coal boiler fume dust pelletizing system " of " pollution prevention technique " the 12nd volume the 1st phase 61～62 pages of introductions adopts the venturi granite deduster to carry out dust-removal and desulfurizing, and the water source is a fresh water, and the water after the dedusting enters the flushing cinder pond, and flushing cinder water recycles.The 4th～6 page of " safety and environmental project " the 11st the 3rd phase of volume introduced a kind of coal-fired heating power power plant dust pelletizing system, and flushing cinder water is removed the venturi granite water film dedusting, and dedusting water removes flushing cinder.The water dust scrubber that adopts in the above-mentioned middle and small burn coal boiler gas cleaning when reaching dedusting, by add alkaline matter in liquid phase, reaches certain desulfurized effect simultaneously.But the water dust scrubber gas-liquid contact time is very short, and its desulfurized effect is restricted, and pressure drop is bigger, needs a plurality of links such as stirring, dosing, and table of equipment (cover) number is many, the flow process complexity, and investment and running expense are higher.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of acidic water after desulfurization of coal burning gas neutralization method and equipment.This coal burning flue gas desulfurization device technique is simple, number of devices is few, floor space is little, operating cost is cheap.
Acidic water after desulfurization of coal burning gas neutralization method of the present invention comprises following content, flue gas desulfurization acid water at first enters grey slag bath, Separation of Solid and Liquid in grey slag bath, the lime-ash discharging, liquid phase enters neutralization pond, stacks block alkaline matter in the neutralization pond, flue gas desulfurization acid water and alkaline matter carry out neutralization reaction, neutralization pond sidewall and/or bottom are provided with grid, and neutralization back logistics flows into sedimentation basin from grid, and the circulation of sedimentation basin supernatant is as ash wash slag water and flue gas desulfurization water source.
The block alkaline matter of stacking in the neutralization pond can be block lime stone, block giobertite etc. one or more, block shape is any, general lump ore can use after preliminary fragmentation, the equivalent diameter of block alkaline matter of feeding intake can be 0.1～30cm, preferred 0.5～15cm, can be the cake mass of uniform-dimension, also can be the different size cake mass.The time of staying of flue gas desulfurization acid water in neutralization pond is 5～50min (in empty pond), is preferably 20～30min, and block alkaline matter injected volume is 1/3～4/5 of the neutralization pond degree of depth, and according to the situation of consumption regular replenishment.Machineries such as neutralization pond employing lime-ash shovel stir.Flue gas desulfurization acid water can also can directly enter grey slag bath directly as the flushing cinder water of carrying boiler ash.
The equipment that acidic water after desulfurization of coal burning gas neutralization method of the present invention comprises sets gradually by technological process, promptly by circulating water flow to setting gradually capital equipments such as grey slag bath, neutralization pond, sedimentation basin, water purifying tank, circulating pump, and coal cinder yard is set to deposit lime-ash and other solid sediment, above grey slag bath, neutralization pond, sedimentation basin, slag removing spade is set, is used for lime-ash discharging and neutralization pond material and stirs.Logistics flows by filter elements such as grids between the pond.
The present invention is achieved in that ash wash slag water sprays in spray column enforcement as absorption liquid, finishes SO
2Course of dissolution; Dash and send lime-ash to enter grey slag bath, in grey slag bath, realize SO
2Soak the alkaline matter generation neutralization reaction of separating out with lime-ash, lime-ash separates with acid water, and cleans out grey slag bath by the lime-ash shovel, leaves coal cinder yard in; Realize that the acid water after the preliminary neutralization reaction flows into neutralization pond certainly, add block lime stone or giobertite in the neutralization pond, acid water and lime stone or giobertite generation neutralization reaction, acid water after product and the neutralization reaction is from flowing into sedimentation basin, carrying out the solid-liquid natural subsidence separates, acid water after the purification is from flowing into water purifying tank, and the slag stock pump is carried absorption liquid to advance flue gas desulfur device and recycled.
The major advantage of the inventive method and device is to use block alkaline matter (block lime stone etc.) as SO in the flue gas
2In and material, SO in the flue gas
2By being dissolved in advance in the ash wash slag water, dissolved SO
2After ash wash slag water again with block alkali living beings generation neutralization reaction.And the available technology adopting lime stone slurry needs large number quipments that block lime stone pulverizing, abrasive dust, screening, slurrying, maintenance slurries are not precipitated, and has increased equipment investment and operating cost greatly.The inventive method passes through directly to use alkaline matters such as block lime stone, has promptly realized the neutralization of acidic materials, has significantly reduced equipment and operating cost again.Neutralizing device is discharged logistics be directly used in and carry boiler ash to have stronger practicality, because be open system, or half open system, mainly utilize the flow of ash wash slag water, do not need high pressure head towards lime-ash.In order to reach certain desulfurized effect, desulphurization plant needs certain liquid-gas ratio, because the amount of flue gas is bigger, so the water spray of desulphurization plant is bigger, and the flow of discharge water can satisfy the needs towards lime-ash.Adopt the spray discharge water towards lime-ash, existing two cover circulations (a cover spray circulatory system a, cover is towards the lime-ash circulatory system) can be reduced to a cover circulation, when not influencing operational effect, reduce number of devices and floor space, reduced investment and running expense.Adopt neutralization pond carry out flue gas desulfurization acid water in and facility, its advantage is simple in structure, cost is low, the desulfurization acid water time of staying is long, neutralization reaction is abundant.Flue gas desulfurization acid water at first contacts with boiler ash, because desulfurization acid water has acidity, helps lime-ash neutral and alkali substance dissolves, has utilized the alkaline matter in the lime-ash, can reduce the consumption of lime stone or giobertite.Technical process of the present invention is reasonable, has that number of devices is few, operating cost is cheap, power consumption is little, easy to operate, characteristics such as automaticity is high, floor space is few, is applicable to the requirement of coal burning flue gas desulfurization.
Description of drawings
Fig. 1 is a kind of technological process of the present invention and device schematic diagram.
Fig. 2 is Fig. 1 facility floor map.
Fig. 3 is a kind of technological process of the present invention and device schematic diagram.
Fig. 4 is Fig. 3 facility floor map.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.The present invention by acid water separate with lime-ash-lime-ash leaches the SO that dissolves in alkaline matter-this alkaline matter and the acid water
2Block Alkaline minerals takes place to add in neutralization reaction-neutralization pond implement neutralization reaction-precipitation neutralized reaction product-links such as water purification storage formation.As depicted in figs. 1 and 2, the present invention is provided with grey slag bath 1, neutralization pond 3, sedimentation basin 5 and 7 four ponds of water purifying tank, adopt the grid 2,6 and the horizontal grate 4 of different meshes, differing heights that four ponds are communicated with between each pond, grid between ash slag bath and the neutralization pond is arranged on the middle and upper part, the grid of neutralization pond is arranged on the bottom, and the grid between sedimentation basin and the water purifying tank is arranged on the middle and upper part.The position of ash slag bath and neutralization pond is higher than sedimentation basin and water purifying tank.Supporting overhead traveling crane lime-ash shovel 10, circulating pump 9 and pipeline 8, coal cinder yard 12 and the tube blower 11 of being provided with, the above-mentioned setting constituted in the acidic water after desulfurization of coal burning gas and facility.
The device structure of Fig. 3 and Fig. 4 and Fig. 1 and Fig. 2 are basic identical, difference is that four ponds can be in same horizontal level, grid between ash slag bath and the neutralization pond is preferably disposed on the middle and upper part, grid between neutralization pond and the sedimentation basin is preferably disposed on the middle and lower part, and the grid between sedimentation basin and the water purifying tank is preferably disposed on the middle and upper part.Grid top preferably is provided with overflow pipe 11A between the pond, to prevent abnormal operation.
During work, ash wash slag water after spray column is implemented spray, is finished SO as absorption liquid
2Course of dissolution, and dash and give lime-ash to enter grey slag bath 1.The alkaline matter of lime-ash stripping in acid water soaks is with the SO that is dissolved in the acid water
2Realize preliminary neutralization reaction, reduced acid water acidity, lime-ash separates with acid water, and cleans out grey slag bath with lime-ash shovel 10, is stored in coal cinder yard 12; Still being the acid grid 2 of acid water through between grey slag bath and neutralization pond flow in the neutralization pond certainly, continue neutralization reaction with the block lime stone or the giobertite that add in neutralization pond, acid water after product and the neutralization reaction is from flowing into sedimentation basin, when block lime stone or giobertite surface generation neutralized reaction product integument, stir lime stone or giobertite with the lime-ash shovel, finish acid water after the neutralization reaction and product through neutralization pond and bottom grid 4 from flowing in the sedimentation basin, carrying out the solid-liquid natural subsidence separates, acid water after the purification is from flowing into water purifying tank, and the slag stock pump is carried absorption liquid to advance flue gas desulfur device and recycled.When dust stratification is arranged at the neutralization pond bottom, the tube blower water filling, the flushing dust stratification also flows into settling tank.
Embodiment 1～5
Press Fig. 1 flow process.Spray column is adopted in flue gas desulfurization, and three stage countercurrents spray is adopted on spray column top, and the nut filling batch is adopted at the middle part, and the bottom is provided with and (makes progress) in the same way and the stream spray.The smoke inlet temperature is 170 ℃.Operating condition and the results are shown in Table 1.
Block alkaline matter equivalent diameter is the diameter of the sphere that equates with this bulk alkaline matter volume.
Table 1 embodiment operating condition and result
| Embodiment | Embodiment 1 | Embodiment 2 | |
Embodiment 4 | |
| Flue gas SO 2Content, mg/Nm 3 | 700 | 1200 | 1800 | 2100 | 2400 |
| The total liquid-gas ratio of spray column, L/Nm 3 | 4 | 8 | 12 | 15 | 20 |
| Spray column is discharged liquid pH value | 3.4 | 3.4 | 3.5 | 3.4 | 3.5 |
| The neutralization pond time of staying, min | 30 | 35 | 20 | 25 | 40 |
| Neutralization pond is stacked alkaline matter | Limestone block | Limestone block | The magnesite stone | The magnesite stone | Limestone block |
| The neutralization pond alkaline matter average diameter that feeds intake, cm | 2 | 5 | 10 | 7 | 1 |
| Neutralization pond effluent pH value | 6.4 | 6.4 | 6.5 | 6.6 | 6.6 |
| Desulfurization degree, % | 90 | 92 | 94 | 95 | 93 |
Claims (10)
1, a kind of acidic water after desulfurization of coal burning gas neutralization method, comprise following content, flue gas desulfurization acid water at first enters grey slag bath, Separation of Solid and Liquid in grey slag bath, lime-ash discharging, liquid phase enters neutralization pond, it is characterized in that stacking block alkaline matter in the neutralization pond, flue gas desulfurization acid water and alkaline matter carry out neutralization reaction, and neutralization pond sidewall and/or bottom are provided with grid, neutralization back logistics flows into sedimentation basin from grid, and the circulation of sedimentation basin supernatant is as ash wash slag water and flue gas desulfurization water source.
2, in accordance with the method for claim 1, it is characterized in that the block alkaline matter of stacking in the described neutralization pond is a kind of or mixture of block lime stone and block giobertite.
3, according to claim 1 or 2 described methods, equivalent diameter is 0.1～30cm when it is characterized in that described block alkaline matter feeds intake.
Equivalent diameter is 0.5～15cm when 4, in accordance with the method for claim 3, it is characterized in that described block alkaline matter feeds intake.
5, in accordance with the method for claim 1, it is characterized in that described block alkaline matter injected volume is 1/3～4/5 of the neutralization pond degree of depth, neutralization pond adopts lime-ash shovel machinery to stir.
6, in accordance with the method for claim 1, it is characterized in that the time of staying of flue gas desulfurization acid water in neutralization pond is 5～50min.
7, in accordance with the method for claim 1, it is characterized in that described flue gas desulfurization acid water directly as the flushing cinder water of carrying boiler ash, or directly enter grey slag bath.
8, the equipment of the described flue gas desulfurization acid water of claim 1 neutralization method use, set gradually by technological process, promptly by circulating water flow to setting gradually grey slag bath, neutralization pond, sedimentation basin, water purifying tank and circulating pump, and coal cinder yard is set to deposit lime-ash and other solid sediment, above grey slag bath, neutralization pond, sedimentation basin, slag removing spade is set, is used for lime-ash discharging and neutralization pond material and stirs; Logistics flows by the grid filtration member between the pond.
9, according to the described equipment of claim 8, the position that it is characterized in that described grey slag bath and neutralization pond is higher than sedimentation basin and water purifying tank, grid between ash slag bath and the neutralization pond is arranged on the middle and upper part, the grid of neutralization pond is arranged on the bottom, and the grid between sedimentation basin and the water purifying tank is arranged on the middle and upper part.
10, according to the described equipment of claim 8, it is characterized in that described grey slag bath, neutralization pond, sedimentation basin and water purifying tank are in same horizontal level, grid between ash slag bath and the neutralization pond is arranged on the middle and upper part, grid between neutralization pond and the sedimentation basin is arranged on the middle and lower part, and the grid between sedimentation basin and the water purifying tank is arranged on the middle and upper part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100475251A CN100431673C (en) | 2005-10-19 | 2005-10-19 | Method and equipment for neutralizing acidic water after desulfurization of coal burning gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100475251A CN100431673C (en) | 2005-10-19 | 2005-10-19 | Method and equipment for neutralizing acidic water after desulfurization of coal burning gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1951545A CN1951545A (en) | 2007-04-25 |
| CN100431673C true CN100431673C (en) | 2008-11-12 |
Family
ID=38058216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100475251A Active CN100431673C (en) | 2005-10-19 | 2005-10-19 | Method and equipment for neutralizing acidic water after desulfurization of coal burning gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100431673C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102951743B (en) * | 2011-08-23 | 2016-01-20 | 上海漕泾热电有限责任公司 | The comprehensive reutilization system of waste water of heating boiler |
| CN104129868B (en) * | 2013-05-02 | 2016-05-18 | 王延军 | The technique of wastewater treatment and reclamation set and processing waste water |
| CN103351076B (en) * | 2013-07-16 | 2014-08-13 | 李德志 | Comprehensive industrial wastewater processing method |
| CN113443734A (en) * | 2020-03-24 | 2021-09-28 | 福建华电可门发电有限公司 | Desulfurization wastewater and slag water coupling system process |
-
2005
- 2005-10-19 CN CNB2005100475251A patent/CN100431673C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1951545A (en) | 2007-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101797466B (en) | Wet flue gas desulphurizing method utilizing carbide slag slurry and device thereof | |
| CN102923905B (en) | Method and devices for treating rare-earth-smelting wastewater | |
| CN202849212U (en) | Rear earth metallurgy wastewater treatment device | |
| CN102091516A (en) | De-scaling and anti-scaling device by using smoke | |
| CN101347706A (en) | Flue gas desulfurization technique using dual alkali method with acetylene sludge as recycling agent | |
| CN108290104A (en) | Multi-level gas washer with multiple overflow-type washers head | |
| CN100431673C (en) | Method and equipment for neutralizing acidic water after desulfurization of coal burning gas | |
| CN100448512C (en) | Coal burning boiler flue gas desulfurization method and device | |
| CN101983098A (en) | Systems and methods for processing co2 | |
| CN100467098C (en) | Coal burning flue gas desulfurization method and device | |
| CN102849814A (en) | Treatment method for purifying sewage and tail gas from furnace gas in acid production from gypsum | |
| CN106315652B (en) | A kind of method of separating-purifying desulfurated plaster and the device for realizing this method | |
| CN102527219B (en) | Smoke gas wet method sulfur removal and dust removal integral treatment system | |
| CN103030231B (en) | Recovery system and recovery technology of desulfuration seawater | |
| CN201899972U (en) | Two-stage dust removal and desulphurization device of multi-tube dust removal and desulphurization tower | |
| CN1061914A (en) | A kind of dusting and desulfurizing technology for smoke of coal-fired boiler | |
| CN205461680U (en) | Desulfuration and dust removal device | |
| CN202762296U (en) | Double-alkali dust removal desulfurization device | |
| CN202478813U (en) | Wet flue gas desulphurization system used for coal-fired power plant boiler | |
| CN106045192A (en) | Flue gas desulfurization wastewater treatment method | |
| CN212348313U (en) | Integrated flue gas purification system and biomass power plant combustion purification system | |
| CN100558450C (en) | A kind of fume desulphurization method and device | |
| CN102824825A (en) | Multi-effect U-shaped tube type dedusting and desulfurization integrated device of coal-fired boiler and dedusting and desulfurization method thereof | |
| CN204447716U (en) | Limestone-based process desulphurization system | |
| CN102553425A (en) | Wet flue gas denitrifying system for coal fired power plant boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |