CN105126587A - Method for removing sulfur dioxide in flue gas - Google Patents
Method for removing sulfur dioxide in flue gas Download PDFInfo
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- CN105126587A CN105126587A CN201510553025.9A CN201510553025A CN105126587A CN 105126587 A CN105126587 A CN 105126587A CN 201510553025 A CN201510553025 A CN 201510553025A CN 105126587 A CN105126587 A CN 105126587A
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- flue gas
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Abstract
The invention relates to a method for removing sulfur dioxide in flue gas. The method comprises the steps that the flue gas containing sulfur is fed from a gas inlet of a super gravity machine, a doctor solution in a barren solution tank is fed from a liquid inlet of the super gravity machine through a barren solution pump, and sulfur dioxide in the flue gas is reacted with the doctor solution to decrease the content of the sulfur dioxide in the flue gas; the desulfurized flue gas and the doctor solution which absorbs the sulfur dioxide flow out from a gas-liquid mixture outlet of the super gravity machine simultaneously and enter a gas-liquid knockout drum to conduct gas-liquid separation; the doctor solution which absorbs the sulfur dioxide in the flue gas enters a settlement regeneration tank to be regenerated through lime, and the regenerated doctor solution flows into the barren solution tank for recycling through the settlement regeneration tank. Sediments can be further processed into gypsum to be recycled or discarded. According to the method for removing the sulfur dioxide in the flue gas in the super gravity machine, the technology process is simple, and a regeneration system is separated from an absorption circulatory system, so that the liquid enters the super gravity machine is always clear liquid, and the scale deposit plugging problem of equipment does not occur; the size of the equipment is small, pressure decreasing is low, and the running cost is low.
Description
Technical field
The invention belongs to flue gas desulfurization technique field, be specifically related to a kind of method that hypergravity machine removes sulfur dioxide in flue gas.
Background technology
Flue gas desulfurization is the desulfurization method of large-scale commercial application in the world at present.Whether have water to participate in by sweetening process and the dry form that wets of desulfurization product, flue gas desulfurization can be divided into again wet method, semidry method and dry method three class technique.The desulfurization product of dry method, semidry method is dry powder-shaped, and easily, technique is comparatively simple in process, and investment is general lower than conventional wet, but with the Ca/S of the dry method of lime or lime masonry desulfurizing agent, semidry method than high, the utilization rate of desulfuration efficiency and desulfurizing agent is lower.Wet Flue Gas Desulfurization Technique is ripe, and efficiency is high, and Ca/S is than low, reliable, easy and simple to handle, becomes most important, the most widely used method of current flue gas scrubbing CO_2.
A kind of flue gas desulfurization technique that is good, that have application prospect requires according to the feature of its flue gas desulfurization course: one is that the pressure drop of system is less, and the power of flue gas blower fan is less, and the energy consumption of system is lower under the prerequisite ensureing desulfuration efficiency; Two is that liquid-gas ratio is less, and the power of liquid phase circulation pump is less, and the energy consumption of system is lower under the prerequisite ensureing desulfuration efficiency; Three is the utilization of capacitys in order to ensure flue gas desulphurization system, system should less scaling and blocking; Three is that technique is simple, small investment.
The main equipment of conventional wet is absorption tower, or equipment volume is huge, and floor space is large, and efficiency is low, such as: the equipment such as spray column; Or investment is large, pressure drop is high, and energy consumption is high, and operating cost is high, and easily blocks.Such as: packed tower, sieve-plate tower, eddy flow tower etc.And at present application lime (lime stone) more widely) the easy fouling of-gypsum and blocking, cause the year utilization of capacity of desulphurization system lower.
High-gravity technology is the chemical separation technology of a new generation, and in super gravity field, the Surface Renewal of gas, liquid forces to carry out, and thus has the mass transfer intensity that the filler tower height in the proportion field of force is a lot.Its core technology is high-gravity rotating bed.Application number is the Chinese patent of 201110076120.6, disclose a kind of method of removing hydrogen sulfide in gas phase through oxidization under high gravity field, it is contacted with H 2 S-containing gas adverse current or cross-flow in desulfurization hypergravity machine by desulfurizing agent, then, after sulfureted for richness desulfurizing agent being added sulphur sedimentation agent, contact regenerating adverse current or cross-flow in hypergravity machine with air.The method Problems existing is the weak effect of scrubbing CO_2.
Summary of the invention
For the above-mentioned problems in the prior art, the invention provides a kind of desulfuration efficiency high, pressure drop little (or without pressure drop), gas liquid ratio is large, the method for not susceptible to plugging hypergravity flue-gas dust-removing and desulfurization.In the desulfurization that can be widely used in the flue gases such as coal-burning boiler and dedusting.
Remove a method for sulfur dioxide in flue gas, comprise the following steps:
Step 1: sulfur-containing smoke gas is entered by the air inlet of hypergravity machine, the doctor solution in lean solution groove enters through the inlet of lean pump by hypergravity machine, and the sulfur dioxide in flue gas and doctor solution react the de-sulfur dioxide fallen in flue gas;
Step 2: the doctor solution of the flue gas after step 1 desulfurization and sulfur dioxide absorption is exported by the gas-liquid mixture also flowing hypergravity machine simultaneously and flows out, and enter knockout drum and carry out gas-liquid separation;
Step 3: the doctor solution absorbing sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates;
Step 4: the doctor solution after step 3 regenerates flows into lean solution groove by sedimentation regeneration tank and recycles.
Further, described and flow hypergravity machine and provide the pressure head of 500Pa to 2500Pa for flue gas, flue gas pressure drop in described hypergravity machine is reduced, until produce negative pressure drop.
Further, the gas liquid ratio in described sweetening process is: 400-3000.
Further, described flue gas and doctor solution enter in hypergravity rotor packing layer by the inner edge of hypergravity machine rotor packing layer simultaneously, flow contact, be forced dispersion, gas-liquid is fully contacted in the packing layer that described hypergravity machine is rotating.
Further, a large amount of liquid foams that flue gas after desulfurization goes out to carry secretly along knockout drum rotating separation, then upwards flow along the pipeline be arranged in knockout drum, by being arranged on the mist eliminator above knockout drum, emptying or to enter chimney emptying by the gas vent above knockout drum after removing described liquid foam.
Further, described doctor solution is one or both the combination in sodium hydroxide solution, aqueous slkali.
Further, the Na ion concentration of described sodium hydroxide solution is 0.05 ~ 3.5mol/l.
Further, the desulphurization reaction that the NaOH in described doctor solution and the sulfur dioxide in flue gas carry out in described hypergravity machine is as follows:
2NaOH+SO
2→Na
2SO
3+H
2O
Na
2SO
3+SO
2+H
2O→2NaHSO
3
Further, the doctor solution absorbing sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates, and the sediment after regeneration is delivered to oxidation trough and is processed into gypsum recovery further after being separated.Regenerative response is as follows:
Further, described in absorb the doctor solution of sulfur dioxide the sedimentation regeneration tank of regenerative process outside hypergravity machine in carry out, make the doctor solution entering described hypergravity machine be clear liquid all the time.
Compared with prior art, the present invention has the following advantages:
(1) desulphurization plant adopts and flows hypergravity machine, the rotor packing layer rotated provides except efficient mass transfer and reacting environment except gas-liquid two-phase (flue gas and separation of flow liquid), can do work to gas phase simultaneously, for flue gas provides the pressure head of 500Pa to 2500Pa, flue gas pressure drop in described hypergravity machine is obviously reduced, until there is negative pressure drop, greatly reduce the power of flue gas blower fan.
(2) gas-liquid two-phase and flow in packing layer that hypergravity machine is rotating and be forced dispersion, gas-liquid contacts completely, makes desulfuration efficiency be up to more than 99%.
(3) gas liquid ratio in sweetening process reaches 400 to 3000, and therefore the circulating consumption of doctor solution is low.
(4) absorb the regeneration of the doctor solution of sulfur dioxide at desulphurization plant, namely carry out outside described hypergravity machine, be that desulfurization clear liquid and sulfur dioxide react and carrys out purifying smoke in described hypergravity machine, therefore the problem of equipment scaling blocking can not occur.
(5) sediment in sedimentation regeneration tank reclaims after can being processed into gypsum further, can not cause secondary pollution.
Accompanying drawing explanation
Fig. 1 is the involved in the present invention structural representation removing sulfur dioxide in flue gas equipment.
Detailed description of the invention
Below in conjunction with accompanying drawing 1, the present invention will be further described with embodiment.Described embodiment, only for the present invention will be further described, does not limit the scope of the invention.
Realize device of the present invention as shown in Figure 1, comprising: hypergravity machine, lean solution groove, lean pump, knockout drum, sedimentation regeneration tank.Wherein hypergravity machine adopts and flows hypergravity machine in the present invention, the features such as have equipment volume little, floor space is few, small investment, and operating cost is low, and this is that current tower desulfurization institute is incomparable.
The method removing sulfur dioxide in flue gas of the present invention comprises the following steps:
Sulfur-containing smoke gas from coal-burning boiler etc. is entered by the air inlet of hypergravity machine, and the doctor solution in lean solution groove enters through the inlet of lean pump by hypergravity machine, and the sulfur dioxide in flue gas and doctor solution react the de-sulfur dioxide fallen in flue gas.The doctor solution of the flue gas after desulfurization and sulfur dioxide absorption is exported by the gas-liquid mixture of hypergravity machine simultaneously and flows out, and tangentially enters knockout drum and carry out gas-liquid separation.The doctor solution absorbing sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates, and the doctor solution after regeneration flows into lean solution groove by sedimentation regeneration tank and recycles.
Described hypergravity machine provides the pressure head of 500Pa to 2500Pa for flue gas, and this makes the pressure drop of described hypergravity flue gas desulphurization system significantly reduce, until there is negative pressure drop, greatly can reduce the power of flue gas blower fan.
The method of the invention, the gas liquid ratio in sweetening process reaches 400 to 3000, reduces the circulating consumption of doctor solution.
Sulfur-containing smoke gas and doctor solution enter in hypergravity rotor packing layer by the inner edge of hypergravity machine rotor packing layer simultaneously, in the packing layer that hypergravity machine is rotating, flow contact, be forced dispersion, gas-liquid fully contacted, desulfuration efficiency is made to reach more than 90%, even up to more than 99%.
A large amount of liquid foams that flue gas after desulfurization goes out to carry secretly along knockout drum rotating separation, then upwards flow along the vapor riser being arranged on knockout drum center, by being arranged on the mist eliminator above knockout drum, emptying or to enter chimney emptying by the gas vent above knockout drum after removing described liquid foam.
Doctor solution is one or both the combination in sodium hydroxide solution, aqueous slkali.
The Na ion concentration of sodium hydroxide solution is 0.05 ~ 3.5mol/l.
The doctor solution absorbing sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates, and the sediment after regeneration is delivered to oxidation trough and is processed into gypsum recovery further after being separated, and can avoid causing secondary pollution.
Carry out in the sedimentation regeneration tank of the regenerative process absorbing the doctor solution of sulfur dioxide outside hypergravity machine, make to be that desulfurization clear liquid and sulfur dioxide react and carrys out purifying smoke all the time in hypergravity machine, therefore the problem of equipment scaling blocking can not occur.
Provide application the present invention carries out desulfurization two examples to the flue gas of coal-burning boiler below.
Example 1:
Import flue gas flow 60m
3/ h, sulfur dioxide concentration 1500mg/m
3, doctor solution is sodium hydroxide solution, and Na ion concentration is 2.5mol/l, and doctor solution flow is 100l/h, hypergravity machine rotating speed 600r/min, and after whole system operation 3min is stable, after de-, flue gas sulphur is containing being 6mg/m
3, smoke desulfurization efficiency is 99.6%.
Example 2:
Import flue gas flow 23000m
3/ h, sulfur dioxide concentration 580mg/m
3, doctor solution is sodium hydroxide solution, and Na ion concentration is 1mol/l, and doctor solution flow is 20 tons/m
3, hypergravity machine rotating speed 240r/min, after de-after system run all right, flue gas sulphur contains for being less than 1mg/m
3, smoke desulfurization efficiency is 99.82%.
The invention is not restricted to above-mentioned embodiment, those skilled in the art make to any apparent improvement of above-mentioned embodiment or change, all can not exceed the protection domain of design of the present invention and claims.
Claims (10)
1. remove a method for sulfur dioxide in flue gas, it is characterized in that comprising the following steps:
Step 1: sulfur-containing smoke gas is entered by the air inlet of hypergravity machine, the doctor solution in lean solution groove is entered by the inlet also flowing hypergravity machine through lean pump, and the sulfur dioxide in flue gas and doctor solution react the de-sulfur dioxide fallen in flue gas;
Step 2: the doctor solution of the flue gas after step 1 desulfurization and sulfur dioxide absorption is exported by the gas-liquid mixture of described hypergravity machine simultaneously and flows out, and enter knockout drum and carry out gas-liquid separation;
Step 3: the doctor solution absorbing the sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates;
Step 4: the doctor solution after step 3 regenerates flows into lean solution groove by sedimentation regeneration tank and recycles.
2. the method removing sulfur dioxide in flue gas according to claim 1, is characterized in that, described hypergravity machine provides the pressure head of 500Pa to 2500Pa for flue gas.
3. the method removing sulfur dioxide in flue gas according to claim 1, is characterized in that, the gas liquid ratio that the sulfur dioxide in flue gas described in step 1 and doctor solution react after de-falling is 400 to 3000.
4. the method removing sulfur dioxide in flue gas according to claim 1, it is characterized in that, flue gas described in step 2 and doctor solution enter in hypergravity rotor packing layer by the inner edge of hypergravity machine rotor packing layer simultaneously, flow contact in the packing layer that hypergravity machine is rotating, be forced dispersion, gas-liquid is contacted completely.
5. the method removing sulfur dioxide in flue gas according to claim 1, it is characterized in that, the liquid foam that flue gas after desulfurization described in step 2 goes out to carry secretly along knockout drum rotating separation, then upwards flow along the pipeline be arranged in knockout drum, by being arranged on the mist eliminator above knockout drum, emptying or to enter chimney emptying by the gas vent above knockout drum after removing described liquid foam.
6. the method removing sulfur dioxide in flue gas according to claim 1, is characterized in that, doctor solution described in step 1 is one or both the combination in sodium hydroxide solution, aqueous slkali.
7. the method removing sulfur dioxide in flue gas according to claim 6, is characterized in that, the Na ion concentration of described sodium hydroxide solution is 0.05 ~ 3.5mol/l.
8. according to the method removing sulfur dioxide in flue gas one of claim 1 to 7 Suo Shu, it is characterized in that, the desulphurization reaction that the NaOH in described doctor solution and the sulfur dioxide in flue gas carry out in described hypergravity machine is as follows:
2NaOH+SO
2→Na
2SO
3+H
2O
Na2SO3+SO2+H2O→2NaHSO3。
9. the method removing sulfur dioxide in flue gas according to claim 8, is characterized in that, the doctor solution absorbing sulfur dioxide in flue gas enters sedimentation regeneration tank lime and regenerates, and the sediment after regeneration is processed into gypsum further and reclaims after being separated; Regenerative response is as follows:
10. the method removing sulfur dioxide in flue gas according to claim 1, it is characterized in that, carry out in the sedimentation regeneration tank of the described regenerative process absorbing the doctor solution of sulfur dioxide outside described hypergravity machine, the doctor solution realizing described hypergravity machine is clear liquid.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110860A (en) * | 2016-08-17 | 2016-11-16 | 沈阳汇川环境工程有限公司 | A kind of oxidative absorption high gravity desulfurization denitrating system and method |
| CN106925101A (en) * | 2017-04-20 | 2017-07-07 | 盐城工学院 | Hypergravity emission-control equipment, the exhaust-gas treatment circulatory system and desulfurization and dust-removal method |
| CN108744907A (en) * | 2018-06-27 | 2018-11-06 | 湖北鼎创泰裕科技有限公司 | A kind of exhaust gas treating method and processing unit containing sulfur dioxide |
| CN112246071A (en) * | 2020-09-29 | 2021-01-22 | 中国船舶重工集团公司第七一一研究所 | Torch gas compression and desulfurization integrated process and system thereof |
| CN114699888A (en) * | 2022-04-01 | 2022-07-05 | 北京化工大学 | A system and method for desulfurization of sulfur-containing tail gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106110860A (en) * | 2016-08-17 | 2016-11-16 | 沈阳汇川环境工程有限公司 | A kind of oxidative absorption high gravity desulfurization denitrating system and method |
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| CN108744907A (en) * | 2018-06-27 | 2018-11-06 | 湖北鼎创泰裕科技有限公司 | A kind of exhaust gas treating method and processing unit containing sulfur dioxide |
| CN112246071A (en) * | 2020-09-29 | 2021-01-22 | 中国船舶重工集团公司第七一一研究所 | Torch gas compression and desulfurization integrated process and system thereof |
| CN114699888A (en) * | 2022-04-01 | 2022-07-05 | 北京化工大学 | A system and method for desulfurization of sulfur-containing tail gas |
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Application publication date: 20151209 |