CN220496009U - Desulfurizing and dedusting tower - Google Patents

Abstract

The utility model provides a desulfurization dust removal tower, which comprises a desulfurization tower body, wherein a chimney is arranged at the top of the desulfurization tower body, and a spraying system and a tray are respectively arranged in the desulfurization tower body from top to bottom; the tray comprises an annular supporting piece and a tray body, and the annular supporting piece is fixedly connected with the inner side wall of the desulfurizing tower body; the tray body comprises a connecting shaft and two semicircular supporting plates, each supporting plate is respectively and rotatably connected with the connecting shaft, a plurality of limiting rods are fixedly arranged on the upper surface of the connecting shaft, and each supporting plate is positioned below each limiting rod; the external diameter of tray body is greater than the internal diameter of annular support piece, and the external diameter of tray body is less than the external diameter of annular support piece to make the tray body can block and install on annular support piece. The desulfurization dust removal tower provided by the utility model can solve the problems of inconvenient tray replacement operation and low replacement efficiency of the existing desulfurization dust removal tower.

Description

Desulfurizing and dedusting tower

Technical Field

The utility model relates to the technical field of flue gas desulfurization equipment, in particular to a desulfurization dust removal tower.

Background

The desulfurizing and dedusting tower is one equipment for desulfurizing and dedusting industrial fume and the fume enters the desulfurizing and dedusting tower to move from bottom to top. In order to improve the desulfurization effect of the desulfurization dust removal tower on flue gas, a metal tray is usually installed in the desulfurization dust removal tower, and through holes formed in the metal tray, the passing flue gas can be distributed more uniformly, so that the desulfurization efficiency is improved.

In the existing desulfurization dust removal tower, the metal tray is generally arranged below a spraying system, acidic solution can be generated after the spraying agent reacts with sulfur dioxide and other gases in the flue gas, and the metal tray is in contact with the flue gas and the acidic solution for a long time and is easy to corrode, so that the metal tray is often required to be replaced after the desulfurization dust removal tower is operated for a period of time. However, most of the existing metal trays are welded and fixed in the desulfurization dust removal tower, and the existing metal trays are required to be cut and re-welded during replacement, so that the replacement operation is inconvenient and the efficiency is low.

Disclosure of Invention

The utility model aims to provide a desulfurization dust removal tower, which can solve the problems of inconvenient replacement operation and low replacement efficiency of the existing tray in the desulfurization dust removal tower.

The utility model provides a desulfurization dust removal tower, which comprises a desulfurization tower body, wherein a chimney is arranged at the top of the desulfurization tower body, and a spraying system and a tray are respectively arranged in the desulfurization tower body from top to bottom; the tray comprises an annular supporting piece and a tray body, wherein the annular supporting piece is fixedly connected with the inner side wall of the desulfurizing tower body; the tray body is circular, the tray body comprises a connecting shaft and two semicircular supporting plates, a plurality of through holes are respectively formed in each supporting plate, each supporting plate is respectively and rotatably connected with the connecting shaft, a plurality of limiting rods used for limiting the rotating positions of the supporting plates are fixedly arranged on the upper surface of the connecting shaft, and each supporting plate is located below each limiting rod; the limiting rods are respectively arranged at intervals along the length direction of the connecting shaft in sequence, and each limiting rod is respectively perpendicular to the connecting shaft; the outer diameter of the tray body is larger than the inner diameter of the annular supporting piece, and the outer diameter of the tray body is smaller than the outer diameter of the annular supporting piece, so that the tray body can be clamped and installed on the annular supporting piece.

According to the desulfurization and dust removal tower provided by the utility model, the two supporting plates are the first supporting plate and the second supporting plate respectively, the first supporting plate is rotationally connected with the connecting shaft through the two first shaft sleeves, the second supporting plate is rotationally connected with the connecting shaft through the two second shaft sleeves, and the first shaft sleeves and the second shaft sleeves are staggered.

According to the desulfurization dust removal tower provided by the utility model, three limiting rods are arranged, and one limiting rod is respectively arranged between each adjacent first shaft sleeve and second shaft sleeve.

According to the desulfurization dust removal tower provided by the utility model, the length of each limiting rod is smaller than the outer diameter of the tray body.

According to the desulfurization dust removal tower provided by the utility model, the limiting rod is detachably connected with the supporting plate through the semicircular clamp.

According to the desulfurization dust removal tower provided by the utility model, the demister and the wet-type electric dust remover are arranged in the desulfurization tower body, the demister is positioned above the spraying system, and the wet-type electric dust remover is positioned above the demister.

According to the desulfurization and dust removal tower provided by the utility model, the slurry pool is arranged at the bottom of the desulfurization tower body, and the tray is positioned above the slurry pool.

According to the desulfurization and dust removal tower provided by the utility model, the desulfurization and dust removal tower body comprises an upper reducing section, a dust removal section, a lower reducing section and a spray mist removal section which are sequentially connected from top to bottom, wherein the upper reducing section is a conical cavity section with a small upper part and a large lower part, the dust removal section is a straight cylindrical cavity section, the lower reducing section is a conical cavity section with a large upper part and a small lower part, and the spray mist removal section is a straight cylindrical cavity section, wherein the diameter of the dust removal section is larger than that of the spray mist removal section;

the chimney is installed in the upper end of last reducing section, wet-type electrostatic precipitator install in the dust removal section, the defroster spray system, the tray with the thick liquid pond install respectively in spray the defogging section.

According to the desulfurization dust removal tower provided by the utility model, the top of the chimney is provided with the flue gas outlet, the side wall of the spray demisting section is provided with the flue gas inlet, the flue gas inlet is positioned below the tray, and the flue gas inlet is positioned above the slurry pond.

The utility model provides a desulfurization dust removal tower, which comprises a desulfurization tower body, wherein a chimney is arranged at the top of the desulfurization tower body, and a spraying system and a tray are respectively arranged in the desulfurization tower body from top to bottom; the tray comprises an annular supporting piece and a tray body, and the annular supporting piece is fixedly connected with the inner side wall of the desulfurizing tower body; the tray body is circular, the tray body comprises a connecting shaft and two semicircular supporting plates, a plurality of through holes are respectively formed in each supporting plate, each supporting plate is respectively and rotatably connected with the connecting shaft, a plurality of limiting rods for limiting the rotating positions of the supporting plates are fixedly arranged on the upper surface of the connecting shaft, and each supporting plate is located below each limiting rod; the limiting rods are respectively arranged at intervals along the length direction of the connecting shaft in sequence, and are respectively perpendicular to the connecting shaft; the external diameter of tray body is greater than the internal diameter of annular support piece, and the external diameter of tray body is less than the external diameter of annular support piece to make the tray body can block and install on annular support piece. When the tray body needs to be replaced, the damaged tray body can be lifted upwards from the annular supporting piece so that the tray body is separated from the annular supporting piece, then the two supporting plates of the tray body can be overturned and folded under the action of self gravity, so that the tray body can be conveniently taken out from the desulfurizing tower body, then the two supporting plates of the new tray body are unfolded and then are installed on the annular supporting piece, and at the moment, the two supporting plates can be in a horizontal state due to the limiting effect of the limiting rod, so that the stable support is installed on the annular supporting piece. Therefore, the desulfurization dust removal tower provided by the utility model is convenient to replace the tray body by the turnover structure of the tray body and the detachable installation mode between the tray body and the annular supporting piece, and the replacement efficiency is higher without cutting and welding during replacement.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of a desulfurizing and dedusting tower of the present utility model;

FIG. 2 is a schematic view of the structure of a tray in the desulfurizing and dedusting tower of the present utility model;

FIG. 3 is a schematic structural view of an annular support member in the desulfurizing dust-removing tower of the present utility model;

FIG. 4 is a schematic view of the structure of the tray body in the desulfurizing and dedusting tower of the present utility model;

FIG. 5 is a schematic diagram of the structure of the spray system in the desulfurizing and dedusting tower of the present utility model.

Reference numerals illustrate:

1. a desulfurizing tower body; 101. an upper reducing section; 102. a dust removal section; 103. a lower reducing section; 104. spraying and demisting sections; 2. a chimney; 3. a spraying system; 301. a slurry spraying main pipe; 302. slurry spraying branch pipes; 303. a nozzle; 4. a tray; 41. an annular support; 42. a tray body; 421. a connecting shaft; 422. a supporting plate; 423. a limit rod; 424. a first sleeve; 425. a second sleeve; 426. a clamp; 5. a demister; 6. wet electric dust collector; 7. a slurry pool; 8. a flue gas outlet; 9. and a flue gas inlet.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 5, the desulfurizing and dedusting tower according to the embodiment of the utility model comprises a desulfurizing tower body 1, wherein a chimney 2 is arranged at the top of the desulfurizing tower body 1, and a spraying system 3 and a tray 4 are respectively arranged in the desulfurizing tower body 1 from top to bottom.

Wherein, tray 4 includes annular support piece 41 and tray body 42, and annular support piece 41 and desulfurizing tower body 1's inside wall fixed connection. The tray body 42 is circular, and the tray body 42 includes connecting axle 421 and two semicircular layer boards 422, has a plurality of through-holes on each layer board 422 equipartition, and each layer board 422 rotates with connecting axle 421 respectively to be connected, has set firmly a plurality of gag lever posts 423 that are used for restricting the rotation position of layer board at the upper surface of connecting axle 421, and each layer board 422 all is located the below of gag lever post 423. The plurality of limiting rods 423 are respectively arranged at intervals along the length direction of the connecting shaft 421 in sequence, and each limiting rod 423 is respectively perpendicular to the connecting shaft 421.

Wherein, the external diameter of the tray body 42 is larger than the internal diameter of the annular supporting member 41, and the external diameter of the tray body 42 is smaller than the external diameter of the annular supporting member 41, so that the tray body 42 can be mounted on the annular supporting member 41 in a clamping manner.

When in use, as the tray 4 is arranged below the spraying system 3, the spraying agent sprayed by the spraying system 3 can react with the sulfur dioxide and other gases in the flue gas, the generated acid solution can be in contact with the tray 4, and after long-time use, the tray body 42 is easy to corrode, so that the tray body 42 needs to be replaced periodically.

When the tray body 42 needs to be replaced, the damaged tray body 42 can be lifted upwards from the annular supporting piece 41, so that the tray body 42 is separated from the annular supporting piece 41, then the two supporting plates 422 of the tray body 42 can be overturned and folded under the action of self gravity, so that the tray body 42 is conveniently taken out from the desulfurizing tower body 1, then the two supporting plates 422 of the new tray body 42 are unfolded and then are mounted on the annular supporting piece 41, and at the moment, the two supporting plates 422 can be in a horizontal state due to the limiting effect of the limiting rod 423, so that stable clamping is supported on the annular supporting piece 41.

Therefore, the desulfurization and dust removal tower provided by the embodiment of the utility model has the advantages that the tray body 42 is convenient to replace by the turnover structure of the tray body 42 and the detachable installation mode between the tray body 42 and the annular supporting piece 41, cutting and welding are not needed during replacement, and the replacement efficiency is higher.

In some embodiments of the present utility model, the two support plates 422 are respectively a first support plate and a second support plate, the first support plate is rotatably connected to the connecting shaft 421 through two first shaft sleeves 424, the second support plate is rotatably connected to the connecting shaft 421 through two second shaft sleeves 425, and the first shaft sleeves 424 and the second shaft sleeves 425 are staggered, so that the reliability of the rotational connection between the support plates 422 and the connecting shaft 421 is ensured.

Specifically, three limiting rods 423 are provided, and one limiting rod 423 is provided between each adjacent first sleeve 424 and second sleeve 425, so that structural stability and reliability of the tray body 42 in the unfolded state can be ensured.

In some embodiments of the present utility model, the length of each of the limit rods 423 is smaller than the outer diameter of the tray body 42, thereby facilitating the installation of the tray body 42 in the desulfurizing tower body 1.

In some embodiments of the present utility model, the stop bar 423 is detachably coupled to the blade 422 via a semi-circular clip 426. When the tray body 42 is required to be mounted on the annular supporting member 41, the supporting plates 422 and the limiting rods 423 can be connected through the clamping bands 426, so that the two supporting plates 422 of the tray body 42 are kept in a horizontal state, and the tray body 42 is convenient to mount. When the tray body 42 needs to be disassembled, the connection state of the clamp 426 is released, and then the tray body 42 is lifted upwards, so that the two supporting plates 422 of the tray body 42 are folded downwards under the action of gravity to be folded, and the tray body 42 is conveniently taken out from the desulfurizing tower body 1.

In some embodiments of the present utility model, a mist eliminator 5 and a wet electric precipitator 6 are installed in the desulfurizing tower body 1, the mist eliminator 5 being located above the spray system 3, and the wet electric precipitator 6 being located above the mist eliminator 5. Through setting up defroster 5, can collect fog grain, thick liquid droplet etc. entrained in the flue gas after spraying, realize the defogging treatment to the flue gas. Through setting up wet-type electrostatic precipitator 6 for carry out further dust removal to the flue gas after defogging processing.

In some embodiments of the present utility model, a slurry pond 7 is provided at the bottom of the desulfurizing tower body 1, and the tray 4 is located above the slurry pond 7. By providing a slurry reservoir 7, the shower-drop slurry is collected.

In some embodiments of the present utility model, the desulfurizing tower body 1 includes an upper reducing section 101, a dust removing section 102, a lower reducing section 103 and a spray mist removing section 104 which are sequentially connected from top to bottom, the upper reducing section 101 is a conical cavity section with a smaller upper part and a larger lower part, the dust removing section 102 is a straight cylindrical cavity section, the lower reducing section 103 is a conical cavity section with a larger upper part and a smaller lower part, and the spray mist removing section 104 is a straight cylindrical cavity section, wherein the diameter of the dust removing section 102 is larger than the diameter of the spray mist removing section 104.

Wherein, chimney 2 installs in the upper end of last reducing section 101, and wet electrostatic precipitator 6 installs in dust removal section 102, and defroster 5, spraying system 3, tray 4 and thick liquid pond 7 are installed respectively in spraying defogging section 104. Through setting up reducing section 103 down, can make flue gas after defogging processing fully contact with wet electrostatic precipitator 6 to wet electrostatic precipitator 6 has improved the dust removal effect to the flue gas. By arranging the upper reducing section 101, the flue gas subjected to dust removal treatment can be discharged in a concentrated manner.

In some embodiments of the utility model, a flue gas outlet 8 is provided at the top of the chimney 2, a flue gas inlet 9 is provided on the side wall of the spray mist eliminator 104, the flue gas inlet 9 is located below the tray 4, and the flue gas inlet 9 is located above the slurry pond 7.

In some embodiments of the present utility model, the spraying system 3 includes a plurality of slurry spraying main pipes 301, a plurality of slurry spraying branch pipes 302 are respectively connected to each slurry spraying main pipe 301, a plurality of nozzles 303 are respectively connected to each slurry spraying branch pipe 302, and each nozzle 303 is disposed downward. Wherein the slurry spraying main pipe 301 adopts a pipeline with a constant cross section, and the slurry spraying branch pipe 302 adopts a pipeline with a gradual change cross section.

The slurry spraying main pipe 301 adopts a fusiform section pipeline, the long axis of the fusiform section pipeline is parallel to the direction of the flow velocity of the flue gas, and the short axis of the fusiform section pipeline is perpendicular to the flow velocity of the flue gas. The slurry spraying branch pipe 302 adopts a water drop-shaped section pipeline, the tip end of the water drop-shaped section pipeline is downwards arranged, the long axis of the water drop-shaped section pipeline is parallel to the direction of the flow velocity of the flue gas, and the short axis of the water drop-shaped section pipeline is perpendicular to the flow velocity of the flue gas.

Through arranging the slurry spraying main pipe 301 and the slurry spraying branch pipe 302 according to the above mode, the projection area of the slurry spraying main pipe 301 and the slurry spraying branch pipe 302 can be greatly reduced, so that the resistance of a spraying system is reduced, the flow field of flue gas is optimized, the energy consumption of the spraying system is reduced, the mass transfer efficiency is improved, and the desulfurization efficiency of the desulfurization and dust removal tower is further improved.

In addition, the slurry spray main pipe 301 and the slurry spray branch pipe 302 arranged in the above manner will have significantly increased resistance moment and inertia moment of the pipe section, so that the bending resistance bearing capacity of the slurry spray main pipe 301 and the slurry spray branch pipe 302 will be significantly improved, the deflection will be smaller, and meanwhile, water accumulation at the bottom outside the pipe can be prevented.

Taking a million units as an example, the diameter of the originally designed desulfurizing tower body is 19.6m, and each layer is provided with two spraying main pipes with the diameter of 0.9 m. If the slurry spraying main pipe 301 with the fusiform section of the embodiment is adopted, and the slurry spraying main pipe 301 with the minor axis of the fusiform section pipeline of 0.5m is selected according to the principle of equal flow area, the major axis of the fusiform section pipeline can be calculated according to the equal area. After the slurry spraying main pipes 301 with the fusiform cross section of the embodiment are adopted, the length is 18.6m, the windward area of the single-layer slurry spraying main pipe 301 is 18.6 square meters, the area of the single-layer slurry spraying main pipe 301 occupies 6.17% of the cross section area of the desulfurizing tower body, and compared with the original design, the length is reduced by 4.93%.

The original slurry shower manifold 302 had a coarse section diameter of 0.25m and a fine section diameter of 0.2m. If the slurry spray branch pipe 302 is adopted instead of the present embodiment, the short axis of the water-drop-shaped cross section of the large head of the slurry spray branch pipe 302 is 0.2m, the short axis of the water-drop-shaped cross section of the small head is 0.15m, and the total length is about 101m, the projected area of the single-layer slurry spray branch pipe 302 is 17.68 square meters. The area of the single-layer slurry spraying branch pipe 302 occupies 5.86 percent of the cross section area of the desulfurizing tower body, and is reduced by 1.3 percent compared with the prior design.

That is, the areas of the slurry spray header 301 and the slurry spray manifold 302 of each tier are reduced by about 6.23% in total. If the slurry spraying main pipe 301 adopts a fusiform section pipeline and the slurry spraying branch pipe 302 adopts a drop section pipeline according to the calculation that the spraying system 3 comprises a four-layer structure, the total pipeline windward area of the spraying system 3 is reduced by 24.92 percent. Therefore, the resistance of the desulfurization and dust removal tower is reduced by 24.92% at the spraying system 3, and the performance of the desulfurization and dust removal tower is greatly improved.

The working principle of the desulfurization and dust removal tower of the embodiment of the utility model is as follows:

when the desulfurization and dust removal tower works, flue gas flows upwards after entering the desulfurization tower body 1 from the flue gas inlet 9, the spraying system 3 conveys limestone slurry to the slurry spraying branch pipes 302 through the slurry spraying main pipe 301, then conveys the limestone slurry to each nozzle 303 from the slurry spraying branch pipes 302, and the limestone slurry sprayed downwards and upward flue gas flow are subjected to mass transfer reaction to generate gypsum, so that the purpose of removing sulfur oxides in the flue gas is achieved. After desulfurization by spraying, the flue gas passes through a demister 5 to remove water, and then passes through a wet electric precipitator 6 to be subjected to dust removal treatment, and is discharged through a flue gas outlet 8 of the chimney 2. In the desulfurization treatment process of the flue gas, sprayed limestone slurry passes through the through holes of the tray body 42 and is collected in the slurry pool 7 below.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (9)

1. The desulfurizing and dedusting tower is characterized by comprising a desulfurizing tower body, wherein a chimney is arranged at the top of the desulfurizing tower body, and a spraying system and a tray are respectively arranged in the desulfurizing tower body from top to bottom; the tray comprises an annular supporting piece and a tray body, wherein the annular supporting piece is fixedly connected with the inner side wall of the desulfurizing tower body; the tray body is circular, the tray body comprises a connecting shaft and two semicircular supporting plates, a plurality of through holes are respectively formed in each supporting plate, each supporting plate is respectively and rotatably connected with the connecting shaft, a plurality of limiting rods used for limiting the rotating positions of the supporting plates are fixedly arranged on the upper surface of the connecting shaft, and each supporting plate is located below each limiting rod; the limiting rods are respectively arranged at intervals along the length direction of the connecting shaft in sequence, and each limiting rod is respectively perpendicular to the connecting shaft; the outer diameter of the tray body is larger than the inner diameter of the annular supporting piece, and the outer diameter of the tray body is smaller than the outer diameter of the annular supporting piece, so that the tray body can be clamped and installed on the annular supporting piece.

2. The desulfurizing and dedusting tower according to claim 1, wherein the two support plates are a first support plate and a second support plate, the first support plate is rotatably connected with the connecting shaft through two first shaft sleeves, the second support plate is rotatably connected with the connecting shaft through two second shaft sleeves, and the first shaft sleeves and the second shaft sleeves are staggered.

3. The desulfurizing and dedusting tower according to claim 2, wherein three limit rods are provided, and one limit rod is respectively arranged between each adjacent first shaft sleeve and second shaft sleeve.

4. A desulfurizing dust tower according to claim 3, wherein the length of each of said stopper rods is smaller than the outer diameter of said tray body.

5. The desulfurizing and dedusting tower according to claim 1, wherein the limiting rod is detachably connected with the supporting plate through a semicircular clamp.

6. The desulfurization and dust-removing tower according to any one of claims 1 to 5, characterized in that a mist eliminator and a wet electric dust collector are installed in the desulfurization tower body, the mist eliminator being located above the spray system, and the wet electric dust collector being located above the mist eliminator.

7. The desulfurizing and dedusting tower according to claim 6, wherein a slurry pool is provided at the bottom of the desulfurizing tower body, and the tray is located above the slurry pool.

8. The desulfurizing and dedusting tower according to claim 7, wherein the desulfurizing tower body comprises an upper reducing section, a dedusting section, a lower reducing section and a spray demisting section which are sequentially connected from top to bottom, wherein the upper reducing section is a conical cavity section with a smaller upper part and a larger lower part, the dedusting section is a straight cylindrical cavity section, the lower reducing section is a conical cavity section with a larger upper part and a smaller lower part, and the spray demisting section is a straight cylindrical cavity section, wherein the diameter of the dedusting section is larger than that of the spray demisting section;

the chimney is installed in the upper end of last reducing section, wet-type electrostatic precipitator install in the dust removal section, the defroster spray system, the tray with the thick liquid pond install respectively in spray the defogging section.

9. The desulfurizing and dedusting tower according to claim 8, wherein a flue gas outlet is arranged at the top of the chimney, a flue gas inlet is arranged on the side wall of the spray demisting section, the flue gas inlet is positioned below the tray, and the flue gas inlet is positioned above the slurry pond.