CN1327870A - Process for preventing acid dew-point corrosion in desulfurizing fume - Google Patents
Process for preventing acid dew-point corrosion in desulfurizing fume Download PDFInfo
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- CN1327870A CN1327870A CN 01113415 CN01113415A CN1327870A CN 1327870 A CN1327870 A CN 1327870A CN 01113415 CN01113415 CN 01113415 CN 01113415 A CN01113415 A CN 01113415A CN 1327870 A CN1327870 A CN 1327870A
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- flue gas
- ammonia
- gas
- acid dew
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Abstract
A process for preventing acid dew-point corrosion in desulfurizing fume features that before the fume comes into heat exchanger, ammonia is added to the fume for taking part in reaction with SO2 and water to generate ammonium sulfate, which exists in said fume as fine particles state and may be removed in subsequent desulfurizing procedure.
Description
The present invention relates to a kind ofly in boiler flue gas desulfurization (sulfur dioxide) process, prevent the method for sulfur-containing smoke gas corrosion flue and chimney, relate in particular to by adding additive and prevent the method for sulfur-containing smoke gas corrosion flue and chimney.
At present, in industrial efficient for raising desulfurization reactor (being commonly referred to desulfurizing tower), flue-gas temperature will be reduced to 45-55 ℃ usually and enter desulfurization reactor again and carry out desulfurization, then, for preventing the corrosion of rear portion flue and chimney, and increase the rising height of desulfidation tail gas when chimney is discharged, again desulfidation tail gas is heated to more than 80 ℃.Its heat derives from the import flue gas usually, and between 135-170 ℃, it is directed to boiler induced-draft fan to its temperature usually.
Reheating equipment is commonly referred to smoke re-heater, is sometimes referred to as the flue gas heat exchange device.In the flue gas desulfurization field, reheater has two kinds of forms, is called rotation heat accumulating type and heat pipe-type.Both respectively have pluses and minuses, and rotary consumptive material is few, but leak big; Heat pipe-type does not have leakage, but consumptive material is big.But, both costs are more or less the same.No matter the sort of form, all there is the acid dew piont corrosion problem of a hot side of reheater in existing technology.In rotary reheater, to heat-accumulating heat-transfer element (corrugated structure) glass plating enamel, this way is promptly unreliable, involves great expense again.In the heat pipe-type reheater, select the stainless steel of low temperature resistant corrosion usually for use, such as ND steel etc., but its service life is also very limited, usually less than two years.
The object of the present invention is to provide a kind of by in flue gas, adding alkalinity additive, prevent that to reduce flue gas dew point thereby acid condensation from preventing the flue gas acid dew point corroding method, to overcome short defective of existing in prior technology equipment manufacturing cost costliness, service life.
Realize the technical scheme of the object of the invention:
SO in the flue gas
3Condensation and with flue gas in water to form sulfuric acid be the basic reason that causes corrosion, reduce acid dew point and be to prevent a kind of effective means of corroding.And SO in the reduction gas
3Content be the most direct way that reduces acid dew point.The present invention adds ammonia in flue gas, make itself and SO
3Reaction generates ammonium sulfate with water, and is present in the flue gas with the fine particle state, can remove in the sweetening process afterwards, thereby can reduce SO in the flue gas
3Content, reduce acid dew point, prevent the flue gas acid dew point corrosion.
Fig. 1 is a schematic flow sheet of the present invention.
As seen from Figure 1, add ammonia in the high-temperature flue gas of boiler induced-draft fan 1 outlet, and then enter heat exchanger 2, carry out the partition heat exchange with desulfurization flue gas from desulphurization system 3, high-temperature flue gas is cooled, and enters desulphurization system; Desulfurization flue gas from desulphurization system 3 is heated in heat exchanger 2, by the chimney emptying.
The addition of ammonia is: addition=(2X
SO3+ X
HCl+ X
HF+ 0.5X
NO2) * V/22.4 * 17 kilogram/hour
Wherein: V represents to mark m
3/ hour;
X represents the percentage composition of each acidic components in flue gas, that is:
X
SO3Expression SO
3Percentage composition in flue gas; X
HClThe percentage composition of expression HCl in flue gas; X
HFThe percentage composition of expression HF in flue gas; X
NO2Expression NO
2Percentage composition in flue gas.
Consider the reason of ammonia and flue gas mixing uniformity, generally requiring actual addition is 5 times of following formula, and preferred addition is 1～2 times.
Ammonia can add with the form of gas, also can add with liquid form, comprises that adding ammoniacal liquor is also passable.But, preferably add with gas form.
For realizing rapid mixing, the present invention adds ammonia in the import of boiler induced-draft fan.Because the draught fan impeller of rotation is exactly a blender the most desirable, that mixing is the fastest at a high speed.
Adding NH with gas form
3Method in, can high speed nozzle, realize that jet entrainment mixes, to reach elementary preferably mixing.
Adopt method of the present invention, can very fully eliminate the acidic materials that can produce the condensation acid dew piont corrosion.Even local heat pipe outer wall condensation acid occurs, owing to have excess of ammonia in the flue gas, also can will close in the surface acid, form dry solid ammonium sulfate, can not produce obvious corrosion, therefore can obviously prolong the service life of reheater.
Below will the present invention is further illustrated by embodiment.
Embodiment 1
Exhaust gas volumn is 450,000 Nm
3/ h is equivalent to the exhaust gas volumn of 100-125MW unit, uses 1% low-sulfur coal, and the air-introduced machine exhaust gas temperature is 150 ℃.SO
3Content is 15ppmv, SO
2Content is 1000ppmv, and HCl is 10ppmv, and HF is 15ppmv, NO
2Be 50ppmv.H
2O content is 8%.136 ℃ of the acid dew points of flue gas.
Add ammonia in the flue gas of air-introduced machine outlet, the addition of ammonia is 2 times of theoretical amount, for:
(2×15＋10＋15＋0.5×50)×2×10
-6×45×10
4×17/22.4
＝54.6kg/h。The content that accounts for total gas is 160ppmv.
After adding ammonia, SO
3Content is 10
-4Ppmv, the acid dew point of flue gas are reduced to 78 ℃.Thereby prevented the corrosion of the acid dew point of flue gas.
Embodiment 2
Exhaust gas volumn is 780,000 Nm
3/ h is equivalent to the exhaust gas volumn of 200MW unit, uses 3-5% sulphur coal, gas SO
2Content is 3800ppmv, and the air-introduced machine exhaust gas temperature is 156 ℃.SO
3Content is 40ppmv, and HCl is 10ppmv, and HF is 15ppmv, NO
2Be 50ppmv.H
2O content is 6%.140 ℃ of the acid dew points of flue gas.
Add ammoniacal liquor in the flue gas of air-introduced machine outlet, the addition of ammoniacal liquor is 2 times of theoretical amount, is 154kg/h, and the content that accounts for total gas is 260ppmv.
After adding ammoniacal liquor, SO
3Content is 10
-3Ppmv, the acid dew point of flue gas are reduced to 80 ℃.Thereby prevented the corrosion of the acid dew point of flue gas.
Claims (7)
1. prevent the method for acid dew piont corrosion in the flue gas desulfurization course, it is characterized in that, in high-temperature flue gas, add ammonia, enter heat exchanger (2) then, carry out the partition heat exchange with desulfurization flue gas from desulphurization system (3) from boiler.
2. the method for claim 1 is characterized in that, the addition of ammonia is 1～5 times of following formula:
Addition=(2X
SO3+ X
HCl+ X
HF+ 0.5X
NO2) * V/22.4 * 17 kilogram/hour
Wherein: V represents to mark m
3/ hour: X
SO3Expression SO
3Percentage composition in flue gas; X
HClThe percentage composition of expression HCl in flue gas; X
HFThe percentage composition of expression HF in flue gas; X
NO2Expression NO
2Percentage composition in flue gas.
3. method as claimed in claim 2 is characterized in that, addition is 1.5～2 times.
4. as claim 1,2 or 3 described methods, it is characterized in that ammonia adds with gas, liquid or ammoniacal liquor form.
5. method as claimed in claim 4 is characterized in that ammonia adds with gas form.
6. as claim 1,2,3 or 5 described methods, it is characterized in that, at the import adding ammonia of boiler induced-draft fan (1).
6. method as claimed in claim 4 is characterized in that, at the import adding ammonia of boiler induced-draft fan (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134151A CN1166437C (en) | 2001-06-12 | 2001-06-12 | Process for preventing acid dew-point corrosion in desulfurizing fume |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134151A CN1166437C (en) | 2001-06-12 | 2001-06-12 | Process for preventing acid dew-point corrosion in desulfurizing fume |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1327870A true CN1327870A (en) | 2001-12-26 |
| CN1166437C CN1166437C (en) | 2004-09-15 |
Family
ID=4660141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011134151A Expired - Fee Related CN1166437C (en) | 2001-06-12 | 2001-06-12 | Process for preventing acid dew-point corrosion in desulfurizing fume |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1166437C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279258A (en) * | 2017-01-05 | 2018-07-13 | 冯雨兰 | Residual heat from boiler fume utilizes Intelligent joint dynamic formula acid dew point TT＆C system |
| CN108619871A (en) * | 2017-03-23 | 2018-10-09 | 中国石油化工股份有限公司 | A kind of processing method and processing device of flue gas and flue gas desulfurization waste-water |
-
2001
- 2001-06-12 CN CNB011134151A patent/CN1166437C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279258A (en) * | 2017-01-05 | 2018-07-13 | 冯雨兰 | Residual heat from boiler fume utilizes Intelligent joint dynamic formula acid dew point TT＆C system |
| CN108619871A (en) * | 2017-03-23 | 2018-10-09 | 中国石油化工股份有限公司 | A kind of processing method and processing device of flue gas and flue gas desulfurization waste-water |
| CN108619871B (en) * | 2017-03-23 | 2020-09-11 | 中国石油化工股份有限公司 | Method and device for treating flue gas and flue gas desulfurization wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1166437C (en) | 2004-09-15 |
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Granted publication date: 20040915 Termination date: 20130612 |