CN202511303U

CN202511303U - Device for preventing wet desulphurized flue gas at chimney exit from carrying liquid droplets

Info

Publication number: CN202511303U
Application number: CN2012200306634U
Authority: CN
Inventors: 陈牧; 田庆峰; 郭建; 张习强; 贾燕; 陈佳乐
Original assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Current assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Priority date: 2012-01-31
Filing date: 2012-01-31
Publication date: 2012-10-31
Anticipated expiration: 2022-01-31

Abstract

The utility model discloses a device for preventing wet desulphurized flue gas at a chimney exit from carrying liquid droplets. The device comprises a sleeve chimney and a main flue and is characterized in that the sleeve chimney comprises a chimney outer tube and a chimney inner tube, wherein a liquid droplet recycling device is arranged in the sleeve chimney and comprises a first-stage acid liquid discharging device and a second-stage acid liquid discharging device; and an anti-blockage cleaning device is arranged below the liquid droplet recycling device. Due to the reasonable tubular design of the inner tube of the sleeve chimney and the adoption of the liquid droplet recycling device and the anti-blockage cleaning device, the problem that the flue gas at the chimney exit carries the liquid droplets is solved. By the device, the phenomenon that the flue gas carries the liquid droplets can be effectively avoided. By popularizing and using the technical scheme, environmental conditions in and around electric power plants can be improved greatly, cleaning frequency and maintenance work quantity are reduced, and good social benefits and economic benefits can be achieved.

Description

Wet desulphurization after funnel outlet Smoke prevention gas-liquid is dripped carrying device

Technical field

Coal-fired station's flue gas that the utility model relates in the power industry is handled, and refers to it is that a kind of wet desulphurization after funnel outlet Smoke prevention gas-liquid is dripped carrying device particularly.

Background technology

Domestic newly-built coal-burning power plant sulfur removal technology generally adopts limestone/gypsum method technology at present, and is not equipped with GGH (flue gas-flue gas heat exchange device), and the flue gas that get into chimney this moment is a saturated flue gas, and the chimney of configuration is claimed conventional be " wet chimney ".The coal-burning power plant of domestic a large amount of outfit wet desulphurization devices is not provided with the GGH device; Because for the design insufficient recognition of " wet chimney ", it is very general that domestic " wet chimney " outlet flue gas drop carries phenomenon, and promptly the flue gas of chimney breast has drop; Owing to contain dust, gypsum particle and acidic materials etc. in the drop; Can cause bigger adverse effect to power plant and surrounding enviroment, the chimney periphery has been caused environmental hazard, be to have increased contaminants associated discharging in essence; Simultaneously, be with corrosive drop as if dropping down and flow to no corrosion-resistant chimney outer wall, can cause the damage of outer surface burn into, also influence the security of chimney.

The utility model content

The purpose of the utility model is exactly to provide a kind of simple in structure, easy for installation, energy-efficient wet desulphurization after funnel outlet Smoke prevention gas-liquid to drip carrying device.

For realizing above-mentioned purpose; The wet desulphurization after funnel outlet Smoke prevention gas-liquid that the utility model designed is dripped carrying device; Comprise sleeve pipe chimney and flue collector, its special character is: said sleeve pipe chimney comprises chimney urceolus and chimney internal cylinder, is provided with the drop retracting device in said sleeve pipe chimney inside; Said drop retracting device comprises first order acid solution discharger and second level acid solution discharger, also is provided with the anti-clogging cleaning device under the said drop retracting device.

As preferred version; Said chimney internal cylinder is enclosed within the said chimney urceolus; Said chimney internal cylinder comprises outlet section and lower bank smoke pipe; Said outlet section comprises outlet contraction section and outlet straight section, and the diameter of said lower bank smoke pipe is greater than the diameter of said outlet straight section, and the outlet contraction section is between outlet straight section and lower bank smoke pipe.

Further, said outlet straight section height H4 is not less than outlet straight section inside diameter D 0.

Further, said outlet contraction section inner core wall is in easy flights in 0.06; In the said chimney urceolus at least one chimney internal cylinder is set.

As another preferred version; Said second level acid solution discharger is arranged on the chimney internal cylinder bottom; Said first order acid solution discharger is arranged on acid solution discharger below, the said second level, and said first order acid solution discharger passes said chimney internal cylinder barrel and is connected with said flue collector.

Further; Said second level acid solution discharger comprises the annular collecting tank and the acid solution discharge pipe that is connected with said annular sump bottom along chimney internal cylinder tube wall circumference that is arranged on said chimney internal cylinder bottom, and said first order acid solution discharger comprises the water conservancy diversion base plate and the discharge pipe that is positioned at said flue collector bottom that is inclination alpha with said flue collector.

Further, said inclination alpha value is 30～45 °; Said acid solution discharge pipe is along said chimney internal cylinder wall circle distribution; Said acid solution discharge pipe evenly distributes 2～4 along said chimney internal cylinder wall circumference.

As another preferred version again; Said anti-blocking flusher comprises the flushing water pipeline; Said flushing water pipeline passes the perforate on the chimney internal cylinder and is positioned at said flue collector, and said flushing water pipeline comprises the trunk line laid along said water conservancy diversion base plate and perpendicular to the branch pipe(tube) of trunk line.

Further, said branch pipe(tube) is provided with the swan neck that points to said water conservancy diversion base plate, and the head of said swan neck and said water conservancy diversion base plate bottom surface are angle β.

Further, said angle β value is 10～30 °; Said swan neck is connected with washer jet through nipple.

Further, said flushing water pipeline is that one-sided setting or bilateral are symmetrical set.

Further, said flushing water pipeline is provided with at least one branch pipe(tube).

As another preferred version, the material of said chimney internal cylinder adopts the composite titanium steel plate.

The material of chimney internal cylinder preferably adopts the composite titanium steel plate in the utility model, and this is because " wet chimney " middle corrosivity is stronger on the one hand; Secondly, the secondary of different materials carries the critical speed difference, and with respect to materials such as acidproof brick, acid resistant adhesive mortars, it is higher that the secondary of steel plate carries critical speed, and steel plate materials is easier to realize the cylindrical shell contraction structure simultaneously.

The advantage of the utility model is: the utility model carries phenomenon through the flue gas drop that rational sleeve pipe chimney internal cylinder tubular scheme, drop retracting device and the design of anti-clogging cleaning device solve chimney breast.The utility model can avoid drop to carry the generation of phenomenon effectively, promotes the use of the technical scheme of the utility model, can improve the environmental aspect of power plant and periphery greatly, reduces cleaning and maintenance workload, can obtain good social benefit and economic benefit.

Description of drawings

Fig. 1 is the structural representation of the utility model

Fig. 2 is that the A-A of Fig. 1 is to sketch map

Fig. 3 is the local enlarged diagram of the utility model

Fig. 4 is the partial structurtes sketch map of the utility model

Fig. 5 is the partial structurtes schematic top plan view of the utility model

Among the figure: 1, sleeve pipe chimney, 11, the chimney urceolus, 12, chimney internal cylinder, 120, outlet section, 121, the outlet contraction section; 122, outlet straight section, 123, the lower bank smoke pipe, 124, perforate, 2, the drop retracting device, 21, first order acid solution discharger; 211, water conservancy diversion base plate, 212, discharge pipe, 22, second level acid solution discharger, 221, annular collecting tank, 222, the acid solution discharge pipe; 3, slurries pond, 4, flue collector, 5, the anti-clogging cleaning device, 51, the flushing water pipeline, 511, trunk line; 512, branch pipe(tube), 52, swan neck, 521, head, 53, nipple, 54, washer jet.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to describe in detail.

Wet desulphurization after funnel outlet Smoke prevention gas-liquid shown in the figure is dripped carrying device; Comprise sleeve pipe chimney 1 and flue collector 4; Sleeve pipe chimney 1 comprises chimney urceolus 11 and chimney internal cylinder 12; Be provided with drop retracting device 2 in sleeve pipe chimney 1 inside, drop retracting device 2 comprises first order acid solution discharger 21 and second level acid solution discharger 22, and the drop retracting device also is provided with anti-clogging cleaning device 52 times.

Chimney internal cylinder 12 is enclosed within the chimney urceolus 11; Chimney internal cylinder 12 comprises outlet section 120 and lower bank smoke pipe 123; Outlet section 120 comprises outlet contraction section 121 and outlet straight section 122; The diameter of lower bank smoke pipe 123 is greater than the diameter of outlet straight section 122, and outlet contraction section 121 is between outlet straight section 122 and lower bank smoke pipe 123; Outlet straight section 122 height H 4 are not less than outlet straight section 122 inside diameter D 0; Outlet contraction section 121 inner core walls are in easy flights in 0.06; At least one chimney internal cylinder 12 is set in the chimney urceolus 11.

Second level acid solution discharger 22 is arranged on chimney internal cylinder 12 bottoms, and first order acid solution discharger 21 is arranged on acid solution discharger 22 belows, the second level, and first order acid solution discharger 21 passes chimney internal cylinder 12 barrels and is connected with flue collector 4; Second level acid solution discharger 22 comprises the annular collecting tank 221 and the acid solution discharge pipe 222 that is connected with annular collecting tank 221 bottoms along chimney internal cylinder 12 tube wall circumference that is arranged on chimney internal cylinder 12 bottoms; Acid solution in the acid solution discharge pipe 222 flows in the slurries pond 3 in the front end wet desulfurizing process device, and first order acid solution discharger 21 comprises the water conservancy diversion base plate 211 and the discharge pipe 212 that is positioned at flue collector 4 bottoms that is inclination alpha with flue collector 4; The inclination alpha value is 30～45 °; Acid solution discharge pipe 222 is along said chimney internal cylinder 12 wall circle distribution; Acid solution discharge pipe 222 evenly distributes 2～4 along chimney internal cylinder 12 wall circumference.

Anti-blocking flusher 5 comprises flushing water pipeline 51, and flushing water pipeline 51 passes the perforate 124 on the chimney internal cylinder 12 and is positioned at flue collector 4, and flushing water pipeline 51 comprises the trunk line 511 laid along water conservancy diversion base plate 211 and perpendicular to the branch pipe(tube) 512 of trunk line 511; Branch pipe(tube) 512 is provided with the swan neck 52 that points to water conservancy diversion base plate 211, and the head 521 and water conservancy diversion base plate 211 bottom surfaces of swan neck 52 are angle β; Angle β value is 10～30 °; Swan neck 52 is connected with washer jet 54 through nipple 53; Flushing water pipeline 51 is symmetrical set for one-sided setting or bilateral; Flushing water pipeline 51 is provided with at least one branch pipe(tube) 512.

The material of chimney internal cylinder 12 adopts the composite titanium steel plate.

The operation principle and the process of the utility model are following:

The tubular design for scheme mainly considers reasonably to control flue gas flow rate in the utility model.

(1) top is shunk the variable cross-section chimney and prevented the mechanism that the acid solution drop carries: adopting top to shrink the variable cross-section chimney, to have solved flue gas flow rate and the chimney bottom cylindrical shell that chimney breast has relatively high expectations be to prevent that drop from carrying the contradiction that requires between the lower flue gas flow rate.

Shown in the critical flow velocity that the flue gas of unlike material carries drop sees the following form:

Material	Critical flow velocity (m/s)
		Acidproof brick (the radially franchise of brickwork construction is 3mm)	13～17
The pyrex brick	15～18
		Fiberglass	15～18
Alloy, titanium or stainless steel	18～22
		Coating	18～22

For the chimney of titanium lined steel plate, chimney bottom barrel diameter is that 18～20m/s (when boiler BRL operating mode, many boilers insert same chimney internal cylinder, should according to the exhaust gas volumn of many boilers) designs according to flue gas flow rate.

(2) mechanism that the variable cross-section chimney reduces the operating pressure in the chimney is shunk on top: after adopting the variable cross-section chimney; Because chimney bottom cylindrical shell strengthens; Flue gas flow rate reduces, and the resistance of chimney descends, through the inner core molded lines of reasonable control chimney; Can reduce the running resistance of chimney, make in chimney porch or the chimney overall height journey scope and under negative pressure state, work.

When flue gas flow rate was lower than secondary and carries critical speed, the drop that chimney wall freeze-outs was difficult for being taken away by flue gas, but can be dirty along barrel, therefore, should rationally control the chimney diameter, velocity of flue gas is controlled at secondary carries below the critical speed; For the chimney of titanium lined steel plate, chimney bottom barrel diameter is that 18～20m/s (when boiler BRL operating mode, many boilers insert same chimney internal cylinder, should according to the exhaust gas volumn of many boilers) designs according to flue gas flow rate; On the other hand; For fear of " washing under the plume " (crosswind in the atmosphere can make the vertical flow direction of plume deflect even irritate phenomenon down) phenomenon; The flue gas flow rate of chimney breast should be not less than 1.5 times of (boiler THA operating modes of local chimney breast absolute altitude place ambient wind velocity; When many boilers insert same chimney internal cylinder, should be according to the exhaust gas volumn of the boiler of separate unit minimum capacity); Therefore, the tubular of chimney internal cylinder should adopt the scheme of band contraction section, promptly adopts relatively large diameter in the chimney bottom, adopts less relatively diameter in the chimney breast section.

The chimney bore changes the ratio advantage: conventional wet chimney adopts straight barrel type inner core (chimney internal cylinder bottom cylinder internal diameter is identical with the chimney breast internal diameter) more; Adopt top to shrink the variable cross-section chimney and can prevent that the acid solution drop from carrying out the chimney contaminated environment on the one hand; Can reduce the operating pressure in the chimney on the other hand, making the chimney porch is to be negative pressure running status (having negative pressure in the chimney is comparatively favourable operating condition) in negative pressure running status or the chimney overall height journey scope.

Effective effect of chimney bore and the design of chimney barrel systolic slope scope: the main principle of the value of the gradient of the contraction section of top contraction variable cross-section chimney, the height of bottom cylindrical shell straight section is following: at first; For guaranteeing the abundant condensation of drop, gathering and the recovery in the flue gas; The longer the better (but the increase of major diameter straight section length can bring investment to increase) should to make the major diameter straight section of bottom, and ideal design is that 5～10 meters minor diameter straight section is only stayed on top; In addition; In order to control the operating pressure of flue gas in the chimney; Guarantee that in chimney porch or the chimney overall height journey scope be the negative pressure running status; The height of bottom cylindrical shell straight section, the height of contraction section help the decline of flue gas operating pressure in the chimney more greatly more, make the workload of chimney for reducing site operation during design, and the gradient of chimney contraction section generally should be not more than 0.06.

Drop retracting device design in the utility model: adopt two-stage drop retracting device, drop is reclaimed in classification.

First order drop retracting device: flue gas gets into chimney internal cylinder after chimney bottom turns to 90 °; Under the effect of centrifugal force and inertia force; The drop of part larger particles is at first separated down in chimney bottom; Flue gas separatory in the middle part of up process drops under the gravity effect and returns chimney bottom; Therefore the guiding base plate of aspect flue collector is set at the flue collector backplane interface absolute altitude place of chimney internal cylinder, and the stream of liquid droplets that the guiding base plate is collected is in flue collector, and finally the discharge pipe through the flue collector bottom reclaims drop.

Second level drop retracting device: theory analysis and engineering practice all show, when velocity of flue gas was lower than secondary and carries critical speed, the drop that condenses was mainly dirty along chimney wall.In order effectively to reclaim the drop in the chimney, an annular collecting tank is set, and the comb through sump bottom will reclaim liquid and be connected in the slurries pond of wet desulfurization system and go above the horizontal flue access port.

Different on the recovering effect of the classification of drop retracting device and not classification: saturated wet flue gas is that gas-liquid two-phase flows after the desulfurization; And contain partial desulfurization reducing agent slurries drop; Flue gas behind the absorption tower is when flowing through flue; Passed through initial gross separation in flue turning and reducing place, the isolated drop of institute is collected through a discharge pipe (being first order acid solution discharger).After flue gas gets into chimney; Vertically up in chimney bottom through 90 ° of elbows; Under the effect of inertia force, through separate, through deflector and the discharge pipe (be first order acid solution discharger) of chimney bottom collect once more by isolated bulky grain drop for part bulky grain drop; The drop of fine particle continues up with flue gas; In the uphill process of fine particle drop with flue gas; Flue gas is because the adiabatic expansion temperature descends on the one hand, because there is radiation loss in chimney, flue-gas temperature descends along the chimney elevation gradually on the other hand; Because the chimney wall is the minimum zone of temperature in the same cross section of chimney; Main droplets agglomerate forms and compiles at inner wall of stack and flows downward, and the liquid film of inner wall of stack formation is simultaneously also caught the drop that carries in the partial fume, and this part drop is discharged (being second level acid solution discharger) by the collecting tank on flue entrance top; The flue gas at chimney middle part also can be separated out drop along with temperature descends, and less drop also can fall from the chimney middle part after in air-flow, colliding, aggregate into big drop, and this part drop is also collected through discharge pipe (being first order acid solution discharger).

The purpose that chimney internal cylinder is provided with two-stage drop retracting device is the collection efficiency of raising acid solution, the quantity that the reduction flue gas carries drop, improves the operating condition in the chimney.Only when chimney bottom is provided with the drop retracting device (be conventional only be provided with one-level drop retracting device); (the interface cross section of chimney internal cylinder and flue when the inner wall of stack liquid film comes downwards to chimney inlet smokestack; Be referred to as chimney inlet smokestack); Because liquid film falls from smokestack, former established liquid film will be split into fine drop at the smokestack place, and most of fine drop will be carried by flue gas again; Therefore on chimney inlet smokestack top hydrops groove (being second level acid solution discharger) is set and collects acid solution, can reduce the quantity that flue gas carries drop effectively.Simultaneously because the chimney wall is the main region that drop is separated out; The drop that condenses in a large number reclaims through collecting tank (being second level acid solution discharger); Avoid its deflector that drops down onto chimney bottom and discharge pipe (being first order acid solution discharger) to collect; Also greatly reduce flue acid solution discharge pipe possibility of jamming (according to investigation, the discharge pipe of a lot of engineerings stops up owing to slurries, dust in the drop gather).The chimney bottom gleanings is the mixture of drop, desulfurization slurry drop and dust, and not smooth for preventing that the chimney bottom hydrops from flowing, chimney bottom water conservancy diversion flat board and flue base plate are provided with 30～45 ° angle.

Anti-blocking flusher design in the chimney in the utility model: stop up for preventing chimney bottom deflector, annular hydrops groove and the fouling of acid solution discharge pipe, be provided with necessary flushing water system in the chimney, regularly the said equipment is washed.

For the gleanings that guarantees chimney bottom is in time discharged; Prevent that solid matter from gathering; Chimney bottom is provided with the anti-clogging flusher, comprises flushing water pipeline, elbow, nozzle etc., for guaranteeing developing result; Between flushing current and the chimney bottom water conservancy diversion flat board 10～30 ° angle is set, the spacing of every row's flooding nozzle is 2000～3000mm; For preventing that jet expansion is collected thing and stops up, jet expansion is 250mm apart from the distance of chimney base plate or flue base plate.

The main purpose of this device is to prevent that flue gas from carrying out the chimney contaminated environment, and can collect acid solution effectively.

Claims

1. a wet desulphurization after funnel outlet Smoke prevention gas-liquid is dripped carrying device; Comprise sleeve pipe chimney (1) and flue collector (4); It is characterized in that: said sleeve pipe chimney (1) comprises chimney urceolus (11) and chimney internal cylinder (12); Be provided with drop retracting device (2) in said sleeve pipe chimney (1) inside, said drop retracting device (2) comprises first order acid solution discharger (21) and second level acid solution discharger (22), also is provided with anti-clogging cleaning device (5) under the said drop retracting device (2).

2. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 1 is dripped carrying device; It is characterized in that: said chimney internal cylinder (12) is enclosed within the said chimney urceolus (11); Said chimney internal cylinder (12) comprises outlet section (120) and lower bank smoke pipe (123); Said outlet section (120) comprises outlet contraction section (121) and outlet straight section (122); The diameter of said lower bank smoke pipe (123) is greater than the diameter of said outlet straight section (122), and outlet contraction section (121) is positioned between outlet straight section (122) and the lower bank smoke pipe (123).

3. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 2 is dripped carrying device, and it is characterized in that: said outlet straight section (122) height H 4 is not less than outlet straight section (122) inside diameter D 0.

4. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 3 is dripped carrying device, and it is characterized in that: said outlet contraction section (121) inner core wall is in easy flights in 0.06.

5. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 2 is dripped carrying device, it is characterized in that: at least one chimney internal cylinder (12) is set in the said chimney urceolus (11).

6. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 1 is dripped carrying device; It is characterized in that said second level acid solution discharger (22) is arranged on chimney internal cylinder (12) bottom; Said first order acid solution discharger (21) is arranged on said second level acid solution discharger (22) below, and said first order acid solution discharger (21) passes said chimney internal cylinder (12) barrel and is connected with said flue collector (4).

7. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 6 is dripped carrying device; It is characterized in that: said second level acid solution discharger (22) comprise be arranged on said chimney internal cylinder (12) bottom along the annular collecting tank (221) of chimney internal cylinder (12) tube wall circumference and the acid solution discharge pipe (222) that is connected with said annular collecting tank (221) bottom, said first order acid solution discharger (21) comprises and is the water conservancy diversion base plate (211) of inclination alpha with said flue collector (4) and is positioned at the discharge pipe (212) bottom the said flue collector (4).

8. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 7 is dripped carrying device, and it is characterized in that: said inclination alpha value is 30～45 °.

9. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 7 is dripped carrying device, and it is characterized in that: said acid solution discharge pipe (222) is along said chimney internal cylinder (12) wall circle distribution.

10. drip carrying device according to claim 7 or 9 described wet desulphurization after funnel outlet Smoke prevention gas-liquids, it is characterized in that: said acid solution discharge pipe (222) evenly distributes 2～4 along said chimney internal cylinder (12) wall circumference.

11. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 1 is dripped carrying device; It is characterized in that: said anti-blocking flusher (5) comprises flushing water pipeline (51); Said flushing water pipeline (51) passes the perforate (124) on the chimney internal cylinder (12) and is positioned at said flue collector (4), and said flushing water pipeline (51) comprises the trunk line (511) laid along said water conservancy diversion base plate (211) and perpendicular to the branch pipe(tube) (512) of trunk line (511).

12. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 11 is dripped carrying device; It is characterized in that: said branch pipe(tube) (512) is provided with the swan neck (52) that points to said water conservancy diversion base plate (211), and the head (521) of said swan neck (52) is angle β with said water conservancy diversion base plate (211) bottom surface.

13. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 12 is dripped carrying device, it is characterized in that: said angle β value is 10～30 °.

14. drip carrying device according to claim 12 or 13 described wet desulphurization after funnel outlet Smoke prevention gas-liquids, it is characterized in that: said swan neck (52) is connected with washer jet (54) through nipple (53).

15. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 11 is dripped carrying device, it is characterized in that: said flushing water pipeline (51) is symmetrical set for one-sided setting or bilateral.

16. drip carrying device according to claim 11 or 15 described wet desulphurization after funnel outlet Smoke prevention gas-liquids, it is characterized in that: said flushing water pipeline (51) is provided with at least one branch pipe(tube) (512).

17. wet desulphurization after funnel outlet Smoke prevention gas-liquid according to claim 1 is dripped carrying device, it is characterized in that: the material of said chimney internal cylinder (12) adopts the composite titanium steel plate.