CN202185257U - Flue gas desulfurization device for biomass boiler - Google Patents
Flue gas desulfurization device for biomass boiler Download PDFInfo
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- CN202185257U CN202185257U CN2011202822341U CN201120282234U CN202185257U CN 202185257 U CN202185257 U CN 202185257U CN 2011202822341 U CN2011202822341 U CN 2011202822341U CN 201120282234 U CN201120282234 U CN 201120282234U CN 202185257 U CN202185257 U CN 202185257U
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- China
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- absorption tower
- lime
- milk
- flue gas
- slurries
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Abstract
The utility model relates to a flue gas desulfurization device for a biomass boiler, comprising an absorption tower. A sprayer and a demister are arranged in an upper section of the absorption tower. The middle section of the absorption tower is connected with a flue gas guider of the biomass boiler while the lower section of the absorption tower is communicated with air through an oxygen blower. A circulating slurry pump for circularly spraying the slurry is arranged outside the absorption tower. The lower second of the absorption tower is connected with a lime milk absorbent generator through a metering pump. A slurry discharge system is connected at the bottom of the absorption tower. The slurry discharge system comprises a slurry pit connected with the absorption tower. The slurry pit is respectively connected with an accident slurry box and a boiler slagging system through two pit pumps. The accident slurry box is provided with a return pipe connected with the slurry pit. The flue gas desulfurization device for the biomass boiler provided by the utility model is free from a gypsum dewatering system, does not discharge any sewage, waste residue and byproducts and solves the problem of secondary pollution caused by gypsum in a power station, thereby reducing the equipment investment by conventional wet desulphurization greatly.
Description
Technical field
The utility model relates to a kind of device that removes sulfur dioxide, particularly a kind of device that removes sulfur dioxide that is applied to the biomass boiler flue gas.
Background technology
Along with the domestic project of biomass fuel generating of utilizing progressively increases, the control of biomass power plant (boiler capacity is usually less than 150t/h) fume emission is also included in the category of regional environment control.For near the biomass boiler that is located in the key city, SO in the flue gas
2Though the low about 200mg/Nm of concentration
3, but still can not satisfy the Region control requirement, as Beijing " emission standard of air pollutants for boilers " (DB11/139-2007) sulfur dioxide emissioning concentration require to be no more than 20mg/Nm
3The demand of building flue gas desulfur device is arranged.
Domestic existing desulfur technology and process system are applicable to large-scale coal-fired power station boiler more, such as limestone-gypsum wet desulfurizing process, circulating fluid bed semi-drying method sulfur removal technology, ammonia desulfurizing process, double alkali method desulfurizing technology etc.Limestone-gypsum wet desulfurizing process system complex is applied to little unit, and is less economical, and fault rate is high; The circulating fluid bed semi-drying method sulfur removal technology requires the recycle stock of high concentration, is not suitable for biomass boiler; The ammonia process of desulfurization uses ammoniacal liquor as desulfurizing agent, in miniature boiler is used, will cause a large amount of escape ammonia; Double alkali method desulfurizing technology is desulfurizing agent with soda ash, and operating cost is high, poor reliability.
So far, domestic biomass boiler flue gas desulfurization technique also is in blank, can't satisfy the environmental protection demand of biomass boiler.
The utility model content
The purpose of the utility model is to overcome above-mentioned deficiency; And a kind of biomass boiler flue gas desulfur device is provided; This desulfurizer has the advantages that low, the no desulfurizing byproduct of desulfuration efficiency height, reliable, investment and operating cost is handled problems, automaticity is high, to adapt to novel biomass boiler environmental requirement.
For realizing above-mentioned purpose, the utility model adopts following technical proposals:
The biomass boiler flue gas desulfur device comprises the absorption tower, establishes spray equipment and demister in the epimere on absorption tower; The stage casing on absorption tower connects biomass boiler flue gas gatherer; The hypomere on absorption tower communicates with air through the oxygen air blast, is provided with the recycle slurry liquid pump of realizing the slurries circulated sprinkling outside the absorption tower, and the hypomere on absorption tower links to each other with milk of lime adsorbent generation device through measuring pump; The bottom on absorption tower is connected with the slurries exhaust system; The slurries exhaust system comprises the slurries melt pit that links to each other with the absorption tower, and the slurries melt pit links to each other with the boiler slag removal system with accident slurries case respectively through two sump pumps, and accident slurries case is provided with the return duct that links to each other with the slurries melt pit.
Described milk of lime adsorbent generation device; Comprise that milk of lime prepares case, milk of lime batch meter; The milk of lime batch meter communicates with the absorption tower through measuring pump, and prepares case through milk of lime circulating pump and milk of lime and link to each other, and milk of lime prepares case in succession technology water tank and lime powder bin.
Milk of lime prepares establishes agitator in the case, milk of lime prepares case and links to each other with lime powder bin through measuring chute.
Biomass boiler flue gas gatherer comprises the pipeline of introducing gas; The pipeline of introducing gas is connected with two dypass pipelines; Logical baffle door seal fan, the heater of being provided with of dypass pipeline; Another dypass pipeline links to each other with chimney through clean gas baffle door, establishes former gas baffle door and by-pass damper door on the pipeline of introducing gas.
The adherent annular region of described spray equipment adopts 90 ° of jet angles solid tapered, and the central area adopts 120 ° of jet angles hollow tapered.
Described demister links to each other with the technology water tank through the technology water pump.
The utility model is to be applicable to natural plants such as stalks to be the high-efficiency flue gas desulfurization of the biomass boiler of fuel; With the calcium hydroxide breast as desulfurizing agent; Through the measuring chute dosing, the milk of lime measuring pump quantitatively is conveyed into the absorption tower, and the feed-forward signal of measure control is from the SO of chimney inlet
2Concentration, feedback signal is from absorption tower stock tank pH value, and control range is 5.6～5.8, and to biomass boiler outlet flue gas SO
2The characteristics that concentration is low, HCl concentration is high; Be chlorion in the control tower; Slurries are discharged with low concentration (8%～10%), all get into the boiler slag removal system, to realize water balance; For avoiding that the equipment of dreg removing system is produced corrosion, get into can carry out suitable pH value adjusting before the slag system after.Whole technique need not gypsum dehydration system, does not also have any accessory substance and waste water and discharges, and has solved power station gypsum secondary pollution problem.
Through being arranged at the submerged pump in the melt pit of absorption tower, a fortune one is equipped with, and can realize that gypsum is discharged, dump, and slurries such as return at the multiplicated system function.Reduce the equipment investment of conventional wet desulphurization greatly.
The dual strategy in spray cross section is adopted on the absorption tower; Adherent 600mm annular region adopts 90 degree jet angles solid tapered; The central area adopts 120 degree jet angles hollow tapered, and two from upper strata pump entries of calcium hydroxide slurries add, and fully guarantee to contact with the activity of flue gas; Realize the ultralow entrance concentration of 200mg/Nm3, desulfuration efficiency greater than 90%; The spray void tower is adopted on the absorption tower, the control of stock tank low-density, efficient oxidation, no fouling risk.
Description of drawings
Fig. 1 is the structure drawing of device of the utility model;
Wherein 1. absorption towers, 2. absorption tower agitator, 3. recycle slurry liquid pump, 4. oxygen air blast, 5. sump pump, 6. melt pit agitator; 7. lime powder bin, 8. measuring chute, 9. milk of lime prepares case, 10. agitator, 11. milk of lime circulating pumps; 12. the milk of lime batch meter, 13. milk of lime batch meter agitators, 14. measuring pumps, 15. baffle door seal fans, 16. heaters; 17. the by-pass damper door, 18. former gas baffle doors, 19. clean gas baffle doors, 20. technology water tanks, 21. technology water pumps; 22. accident slurries case, 23. accident slurries box mixers, 24. boiler slag removal systems, 25. slurries melt pits.
The specific embodiment
Further specify below in conjunction with accompanying drawing and embodiment.
The biomass boiler flue gas desulfur device; Comprise absorption tower 1; Establish spray equipment and demister in the epimere on absorption tower 1, the stage casing on absorption tower 1 connects biomass boiler flue gas gatherer, and the hypomere on absorption tower 1 communicates with air through oxygen air blast 4; The absorption tower 1 outer recycle slurry liquid pump 3 of realizing the slurries circulated sprinkling that is provided with; The hypomere on absorption tower 1 links to each other with milk of lime adsorbent generation device through measuring pump 14, and the bottom on absorption tower 1 is connected with the slurries exhaust system, and the slurries exhaust system comprises the slurries melt pit 25 that links to each other with absorption tower 1; Slurries melt pit 25 links to each other with boiler slag removal system 24 with accident slurries case 22 respectively through two sump pumps 5, and accident slurries case 22 is provided with the return duct that links to each other with slurries melt pit 25.
Described milk of lime adsorbent generation device; Comprise that milk of lime prepares case 9, milk of lime batch meter 12; Milk of lime batch meter 12 communicates with absorption tower 1 through measuring pump 14; And prepare case 9 through milk of lime circulating pump 11 and milk of lime and link to each other, milk of lime prepares case 9 in succession technology water tank 20 and lime powder bin 7.
Milk of lime prepares establishes agitator 10 in the case 9, milk of lime prepares case 9 and links to each other with lime powder bin 7 through measuring chute 8.
Biomass boiler flue gas gatherer comprises the pipeline of introducing gas; The pipeline of introducing gas is connected with two dypass pipelines; Logical baffle door seal fan 15, the heater 16 of being provided with of dypass pipeline; Another dypass pipeline links to each other with chimney through clean gas baffle door 19, establishes former gas baffle door 18 and by-pass damper door 17 on the pipeline of introducing gas.
The adherent annular region of described spray equipment adopts 90 ° of jet angles solid tapered, and the central area adopts 120 ° of jet angles hollow tapered.
Described demister links to each other with technology water tank 20 through technology water pump 21.
Remove a large amount of SO with biomass boiler flue gas spray washing through the milk of lime slurries in the absorption tower
2, the force air oxidation that the desulfurization product that reaction generates is passed in the stock tank of absorption tower generates calcium sulfate and crystallization generation dihydrate gypsum in stock tank; Regulate the lime milk liquid measure that gets into the absorption tower through flowmeter, make absorption tower stock tank pH value maintain 5.6～5.8, slurries are discharged with 8%～10% concentration in the control absorption tower, and the slush pump after the discharge is fed into the boiler slag removal system.
Absorption tower stock tank pH value maintains in the reasonable range, to guarantee the dissolving and the SO of calcium hydroxide
2Absorption.After former flue gas got into the absorption tower, adverse current fully contacted with slurries through the spray district, and sulfur dioxide, these oxious components of hydrogen chloride are absorbed.Clean flue gas is by the two-stage demister demist that is installed in top, absorption tower after the desulfurization, makes in the outlet flue gas drop concentration less than 75mg/Nm
3Demister is furnished with the flushing pipe of band nozzle, and the demister rinse water is washed the solid particle that deposits on the demister successively through nozzle, and the demister flushing water can also play the effect of regulating absorption tower stock tank liquid level.
The effect of biomass boiler flue gas gatherer is that the former flue gas of boiler is introduced the absorption tower, and the clean flue gas after the desulfurization is introduced smoke stack emission.
The effect of milk of lime adsorbent generation device is to store slaked lime powder, and to the qualified lime slurry of absorption tower supply.
Slaked lime powder is transported to power plant by tank car, and strength is conveyed into lime powder bin.Slaked lime powder gets into milk of lime through the measuring chute dosing and prepares case, in milk of lime prepares case, is mixed into certain density slurries with water, and is delivered to the milk of lime batch meter through the milk of lime circulating pump, after the milk of lime measuring pump quantitatively is conveyed into the absorption tower.
The function of slurries exhaust system is to be delivered to the boiler slag removal device to slurries unnecessary in the absorption tower, as one of supplementing water of boiler flushing cinder water.
The high about 5.0m of slurries liquid level in the absorption tower utilizes the dynamical elevation of self liquid level formation, enters the slurries melt pit to slurries in the absorption tower continuously, is responsible for being sent to the boiler slag removal system to slurries as the gypsum excavationg pump by sump pump.The slurries melt pit is also accepted the discharge liquid that produces in the normally operation of whole desulphurization system, overhaul of the equipments and the daily clean and maintenance, can it is sent to boiler flushing cinder system or return in the absorption tower.Need the emptying stock tank when overhaul on the absorption tower, slurries enter accident slurries case through sump pump in the tower.When restarted on the absorption tower, the accident slurries from flowing to the slurries melt pit, were sent slurries back to absorption tower by sump pump, the gypsum seed when starting once more as the absorption tower from accident slurries case.
The fresh water (FW) system provides the flushing water of demister and other equipment, and the cooling water of running device is provided, and is made up of a technology water tank and two technology water pumps.
Claims (6)
1. biomass boiler flue gas desulfur device; Comprise the absorption tower, establish spray equipment and demister in the epimere on absorption tower, the stage casing on absorption tower connects biomass boiler flue gas gatherer; The hypomere on absorption tower communicates with air through the oxygen air blast; Be provided with the recycle slurry liquid pump of realizing the slurries circulated sprinkling outside the absorption tower, it is characterized in that, the hypomere on absorption tower links to each other with milk of lime adsorbent generation device through measuring pump; The bottom on absorption tower is connected with the slurries exhaust system; The slurries exhaust system comprises the slurries melt pit that links to each other with the absorption tower, and the slurries melt pit links to each other with the boiler slag removal system with accident slurries case respectively through two sump pumps, and accident slurries case is provided with the return duct that links to each other with the slurries melt pit.
2. biomass boiler flue gas desulfur device according to claim 1; It is characterized in that; Described milk of lime adsorbent generation device comprises that milk of lime prepares case, milk of lime batch meter, and the milk of lime batch meter communicates with the absorption tower through measuring pump; And prepare case through milk of lime circulating pump and milk of lime and link to each other, milk of lime prepares case in succession technology water tank and lime powder bin.
3. biomass boiler flue gas desulfur device according to claim 2 is characterized in that, milk of lime prepares establishes agitator in the case, and milk of lime prepares case and links to each other with lime powder bin through measuring chute.
4. biomass boiler flue gas desulfur device according to claim 1; It is characterized in that; Biomass boiler flue gas gatherer comprises the pipeline of introducing gas, and the pipeline of introducing gas is connected with two dypass pipelines, logical baffle door seal fan, the heater of being provided with of dypass pipeline; Another dypass pipeline links to each other with chimney through clean gas baffle door, establishes former gas baffle door and by-pass damper door on the pipeline of introducing gas.
5. biomass boiler flue gas desulfur device according to claim 1 is characterized in that, the adherent annular region of described spray equipment adopts 90 ° of jet angles solid tapered, and the central area adopts 120 ° of jet angles hollow tapered.
6. biomass boiler flue gas desulfur device according to claim 1 is characterized in that, described demister links to each other with the technology water tank through the technology water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202822341U CN202185257U (en) | 2011-08-05 | 2011-08-05 | Flue gas desulfurization device for biomass boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202822341U CN202185257U (en) | 2011-08-05 | 2011-08-05 | Flue gas desulfurization device for biomass boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202185257U true CN202185257U (en) | 2012-04-11 |
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ID=45916736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202822341U Expired - Fee Related CN202185257U (en) | 2011-08-05 | 2011-08-05 | Flue gas desulfurization device for biomass boiler |
Country Status (1)
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|---|---|
| CN (1) | CN202185257U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357341A (en) * | 2011-08-05 | 2012-02-22 | 山东电力工程咨询院有限公司 | Biomass boiler flue gas desulfurization device and process |
-
2011
- 2011-08-05 CN CN2011202822341U patent/CN202185257U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357341A (en) * | 2011-08-05 | 2012-02-22 | 山东电力工程咨询院有限公司 | Biomass boiler flue gas desulfurization device and process |
| CN102357341B (en) * | 2011-08-05 | 2014-03-26 | 山东电力工程咨询院有限公司 | Biomass boiler flue gas desulfurization device and process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120411 Termination date: 20140805 |
|
| EXPY | Termination of patent right or utility model |