CN101332411A - Method capable of reducing flue-gas acid gas in boiler - Google Patents
Method capable of reducing flue-gas acid gas in boiler Download PDFInfo
- Publication number
- CN101332411A CN101332411A CNA2007100430762A CN200710043076A CN101332411A CN 101332411 A CN101332411 A CN 101332411A CN A2007100430762 A CNA2007100430762 A CN A2007100430762A CN 200710043076 A CN200710043076 A CN 200710043076A CN 101332411 A CN101332411 A CN 101332411A
- Authority
- CN
- China
- Prior art keywords
- boiler
- gas
- flue
- adsorbent
- acid gas
- 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.)
- Pending
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method for reducing the acidic gas in the fuel gas in a boiler. The invention is characterized in that: the method adopts limestone slurry of steelmaking by-products as an absorption agent and utilizes eddy flow of high-speed pressurized air to ensure the absorption agent to be injected into a hearth so as to lead that the liquid limestone slurry and the fuel gas are fully mixed, thereby removing the acidic gas in the fuel gas in the boiler. Compared with the prior art, the invention can improve the desulfurization ratio of the fuel gas in the boiler on the basis of reducing the production cost, in addition, the working procedures are simple and the operation is easy.
Description
Technical field
The present invention relates to the Industrial Boiler industrial field, particularly a kind of method that reduces flue-gas acid gas in the boiler
Background technology
Reducing sulfide is the vital task of the energy and Industrial Boiler industry, SO
2Be may be dissolved in water and liquid, aqueous in colourless gas, mainly the burning because of sulfurous fuels or refuse produces.SO
2In case be discharged into atmosphere, can react generation H
2SO
4, inorganic sulfate compounds and organic sulfate compound.Equally, SO
3Also can change into H
2SO
4
Desulphurization system is very huge and complicated, and two major techniques of desulfurization are for absorbing and absorption.Two kinds of methods are by absorbed sulfur dioxide and inorganic salts (as alkali) neutralization reaction to take place to prevent that sulphur from entering environment.Alkali uses in absorption reaction at most, for example calcium, magnesia and carbonate.
Wet method (absorption) utilizes the solubility of sulfur dioxide in the aqueous solution that it is removed from gas.In case the sulfur dioxide dissolving forms H
2SO
3, can react with oxidant and form inorganic sulphide (SO
3 -) and sulfate (SO
4 -).This process can prevent that the sulfur dioxide that dissolves from diffusion again taking place and distribute.These systems when low temperature, operate and or be installed in the back-end ductwork near.Generally all there is higher desulfuration efficiency in this system, but system is huge, construction cost is higher, and in addition, operation and maintenance costs is relatively more expensive.
Dry method (absorption) is absorbed by adsorption system.In the control system of this type, a kind of dry alkaline powder is injected in the flue gas.Sulfur dioxide is adsorbed on the surface of alkaline particulate and the formation compound precipitation that reacts with it.Can use various alkali as adsorbent effectively, wherein the alkaline hydrogen calcium oxide is the adsorbent of normal use.The drying system of spraying into is used for Pump for Medium and Small Power Generating Set, and the rotating spraying system is used for large-scale unit.Their technology more complicated, efficient is on the low side, and cost is than higher.
Therefore, absorption and absorption reduce the not only expensive efficient of sulfur dioxide system and method but also low.Therefore be necessary to seek a new minimizing sulfur dioxide system and method.The byproduct of this method should be processed easily, can reach in the flue gas removal efficiency greater than 70% sulphur by spraying into adsorbent, and minimizing equipment needs (and expense).
Summary of the invention
The purpose of this invention is to provide a kind of method that reduces flue-gas acid gas in the boiler, thereby can remedy the deficiencies in the prior art, improve the desulfurization degree of sour gas in the boiler smoke, reduce production costs.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of method that reduces flue-gas acid gas in the boiler, adopt steel-making byproduct rock lime stone mud as adsorbent.
The method of flue-gas acid gas in the described reduction boiler comprises following steps:
(1) adopt steel-making byproduct rock lime stone mud as adsorbent;
(2) boiler that burns at a strong air classification, there are a large amount of air to be injected into upper boiler with sufficiently high speed, so just have kinetic energy sufficiently to cause that turbulent flow gives the enough time and promotes mixing at the material of upper furnace, upper furnace also is the place of sorbent injection simultaneously.
(3) adsorbent is passed through at upper boiler spout injection lime stone mud, the lime stone mud of injection mixes with the flue gas of rising in the burner hearth, effective and SO
2And SO
3React;
Steel-making byproduct rock lime stone mud is liquid form, main component CaCO
3, account for more than 55% and 30% CaO, be that main desulfuration adsorbent uses, generate calcium sulfate with the sulfur dioxide reaction, its reaction mechanism is:
CaCO
3——CaO+CO
2
CaO+SO
2+1/2O
2——CaSO
4
Also have about 20% MgO also can bring into play the desulfuration adsorbent effect in the lime stone mud, generate magnesium sulfate with the sulfur dioxide reaction, reaction mechanism is:
MgO+SO
2+1/2O
2——MgSO
4
Preferably, the method for flue-gas acid gas in the described reduction boiler is adjustable spout with the orifice design of injecting adsorbent.
Compared with prior art, the present invention can improve the desulfurization degree of flue gas in the boiler on the basis that reduces production costs, and operation is simple, easily operation.
The specific embodiment
A kind of method that reduces flue-gas acid gas in the boiler adopts steel-making byproduct rock lime stone mud as adsorbent.
The method of flue-gas acid gas in the described reduction boiler comprises following steps:
(1) adopt steel-making byproduct rock lime stone mud as adsorbent;
(2) adsorbent is injected in the burner hearth with air;
Steel-making byproduct rock lime stone mud is liquid form, main component CaCO
3, account for more than 55% and 30% CaO, be that main desulfuration adsorbent uses, generate calcium sulfate with the sulfur dioxide reaction, its reaction mechanism is:
CaCO
3——CaO+CO
2
CaO+SO
2+1/2O
2——CaSO
4
Also have about 20% MgO also can bring into play the desulfuration adsorbent effect in the lime stone mud, generate magnesium sulfate with the sulfur dioxide reaction, reaction mechanism is:
MgO+SO
2+1/2O
2-MgSO
4
With the orifice design of injecting adsorbent is adjustable spout.Jet size is selected 4inch for use, and spout quantity is 11.
Desulfurization situation in the flue gas in the boiler sees the following form:
| Limestone particle | μm | 6 | 6 | 6 |
| Ca/S | - | 2.5 | 2 | 3 |
| Nozzle quantity | - | 11 | 11 | 11 |
| Jet size | inch | 4 | 4 | 4 |
| The position of spout | - | Front wall/side wall | Front wall/side wall | Front wall/side wall |
| The concentration of porch SO2 | ppm | 868 | 868 | 868 |
| The concentration of exit SO2 | ppm | 173 | 217 | 156 |
| The SO2 removal efficiency | ％ | 80％ | 75％ | 82％ |
Claims (4)
1. a method that reduces flue-gas acid gas in the boiler is characterized in that, adopts lime stone mud as adsorbent.
2. the method for flue-gas acid gas is characterized in that in the reduction boiler as claimed in claim 1, and described lime stone mud is steel-making byproduct rock lime stone mud.
3. the method for flue-gas acid gas is characterized in that in the reduction boiler as claimed in claim 1 or 2, and adsorbent is infused in the boiler furnace top that strong air classification burns, and having sufficiently, kinetic energy causes in the zone of turbulent flow.
4. the method for flue-gas acid gas is characterized in that in the reduction boiler as claimed in claim 3, and the spout that injects adsorbent adopts adjustable spout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100430762A CN101332411A (en) | 2007-06-29 | 2007-06-29 | Method capable of reducing flue-gas acid gas in boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100430762A CN101332411A (en) | 2007-06-29 | 2007-06-29 | Method capable of reducing flue-gas acid gas in boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101332411A true CN101332411A (en) | 2008-12-31 |
Family
ID=40195449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100430762A Pending CN101332411A (en) | 2007-06-29 | 2007-06-29 | Method capable of reducing flue-gas acid gas in boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101332411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8173090B2 (en) | 2010-07-08 | 2012-05-08 | Air Products And Chemicals, Inc. | Sorbent use with oxyfuel sour compression |
-
2007
- 2007-06-29 CN CNA2007100430762A patent/CN101332411A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8173090B2 (en) | 2010-07-08 | 2012-05-08 | Air Products And Chemicals, Inc. | Sorbent use with oxyfuel sour compression |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2939178T3 (en) | Desulfurization and Denitrification Agent | |
| CN102847428B (en) | A kind of Limestone-gypsum Wet Flue Gas Desulfurization Process additive | |
| CN103453538B (en) | A kind of minimum discharge CFBB with three grades of desulphurization systems | |
| CN105289267B (en) | A kind of coal desulfurization denitrfying agent and preparation method thereof | |
| CN105771617A (en) | Flue gas desulfurization and denitrification method | |
| CN101502744A (en) | Method for removing acid gases in flue gas using red mud as absorbing agent | |
| CN107684808A (en) | A kind of sulfur recovery tail gas handling process and system | |
| KR20070048654A (en) | Method for flue-gas reduction of pollutants in combustion processes | |
| KR101800517B1 (en) | Wet-type Apparatus and Method for Removing Harmful Substance from Exhaust Gas | |
| CN105107373B (en) | It is a kind of to be used for oxidizing simple substance mercury, the composite desulfurizing agent for removing HCl and preparation method thereof | |
| CN104906937A (en) | Flue gas desulfurization and denitrification device and method of coal fired boiler | |
| CN103170228B (en) | A kind of denitrating flue gas mixed solution and application process thereof | |
| CN102145252A (en) | Synergist for limestone-gypsum wet flue gas desulfurization | |
| CN203549871U (en) | Novel ultra-low emission circulating fluidized bed boiler | |
| Du et al. | Desulfurization and denitrification experiments in SDA system: A new high-efficient semi-dry process by NaClO2 | |
| CN106237976B (en) | A kind of adsorbent and its preparation method and application | |
| CN106582232A (en) | Synergistic removal tending to zero discharge purification process and equipment for multicomponent pollutants in flue gas | |
| CN102091516A (en) | De-scaling and anti-scaling device by using smoke | |
| CN104197343A (en) | Oxygen-enriched combustion recycle flue gas catalytic desulfurization system and method | |
| CN101385941B (en) | Efficient circulating fluid bed flue-gas desulfurizing device | |
| CN202113765U (en) | Boiler fume treatment system | |
| CN104941435A (en) | Normal temperature semi-dry method circulating fluidized bed flue gas desulphurization system and method | |
| CN103301735A (en) | Flue gas desulphurization and dust removal agent for small and medium sized boilers | |
| CN101592167A (en) | A kind of multifunctional steam jet draught fan | |
| CN101332411A (en) | Method capable of reducing flue-gas acid gas in 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 | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20081231 |