DK170829B1

DK170829B1 - Cover for open tanks, for example slurry tanks

Info

Publication number: DK170829B1
Application number: DK2194A
Authority: DK
Inventors: Knud Carlsen
Original assignee: Jensen Kristian Barslund; Pedersen Birger Kristian; Knud Carlsen
Priority date: 1993-07-30
Filing date: 1994-01-04
Publication date: 1996-02-05
Also published as: AU7227294A; WO1995003687A1; DK2194A

Description

DK 170829 B1DK 170829 B1

OVERDÆKNING TIL ÅBNE TANKE, FOR EKSEMPEL GYLLETANKECOVER FOR OPEN TANKS FOR EXAMPLE OF FERTILIZER TANKS

Den foreliggende opfindelse angår en overdækning til begrænsning af fordampning fra overfladen af åbne tanke, for 5 eksempel gylletanke, hvilken overdækning omfatter et granuleret materiale med en vægtfylde, der er lavere end tankindholdets.The present invention relates to a coating for limiting evaporation from the surface of open tanks, for example slurry tanks, which cover a granular material having a density lower than the tank contents.

Fra DE offentliggørelsesskrift nr. 27 12 709 kendes en så-10 dan overdækning, hvor man anvender et løst granulat af formstoflegemer eller -kugler, der flyder på overfladen og isolerer mod varmeindstråling.DE Publication No. 27 12 709 discloses such a cover, using a loose granule of plastic bodies or balls floating on the surface and insulating against heat radiation.

Denne konstruktion er imidlertid behæftet med flere ulem-15 per. For det første vil formstoflegemerne eller -kuglerne ved blæsevejr drive over i den ene side af tanken, hvis ikke laget er meget tykt. For det andet kan der opstå tilstopning ved tømning af tanken. For det tredie er der problemer med omrøring, fordi nogle formstoflegemer eller kug-20 ler på trods af den lettere vægt kan blive opblandet med tankindholdet.However, this construction has several drawbacks. First, in case of blowing weather, the plastic bodies or balls will drift over to one side of the tank unless the layer is very thick. Secondly, clogging may occur when emptying the tank. Third, there are problems with agitation because, despite the lighter weight, some plastic bodies or bullets can be mixed with the tank contents.

Det er derfor formålet med opfindelsen at afhjælpe disse ulemper, og dette formål opnås ved en overdækning af den i 25 indledningen angivne art, hvilken overdækning ifølge opfindelsen er særegen ved, at det granulerede materiale er indesluttet i en lukket pose.It is therefore the object of the invention to remedy these disadvantages and this object is achieved by an overlay of the kind specified in the preamble, which overlay according to the invention is peculiar in that the granulated material is enclosed in a sealed bag.

Ved denne udformning af overdækningen vil det granulerede 30 materiale fastholdes på en sikker og pålidelig måde og vil være effektivt forhindret i at kunne blæses hen til en side i den åbne tank under indflydelse af kraftig vind. Ligeledes er en tilstopning ved tømning af tanken forhindret og det granulerede materiale kan heller ikke opblandes med 35 tankens indhold under omrøring.In this design of the cover, the granulated material will be securely and reliably retained and will be effectively prevented from being blown to a side of the open tank under the influence of strong wind. Also, a clogging when emptying the tank is prevented and the granulated material also cannot be mixed with the contents of the tank while stirring.

DK 170829 B1 2DK 170829 B1 2

Ved en fordelagtig udførelsesform for overdækningen udgøres posen helt eller delvist af et net med en maskestørrelse, der er mindre end det granulerede materiales kornstørrelse.In an advantageous embodiment of the covering, the bag is made up in whole or in part of a mesh with a mesh size smaller than the grain size of the granulated material.

5 Endvidere kan overdækningen være ejendommelig ved, at nettet er fastgjort til eller indesluttet i et væsentlig kraftigere bærenet, som har en sådan styrke, at man kan løfte den samlede overdækning op af tanken.Furthermore, the overlay can be peculiar in that the net is attached to or enclosed in a substantially more powerful carrier network, which has such strength that the overall overlay can be lifted out of the tank.

10 En udførelsesform er ejendommelig ved, at overdækningen består af flere sektioner.An embodiment is peculiar in that the overlay consists of several sections.

Hvis man således tager en enkelt sektion ud, kan man foretage omrøring i det derved frigjorte afsnit af tanken sam-15 tidig med, at man som følge af den begrænsede frie overflade i tanken undgår afdampning og lugtgener fra den resterende del af tankens totale overflade i de par dage, hvor omrøringen foretages. Dette er vigtigt, fordi omrøring ellers naturligvis bevirker en ekstra afdampning.Thus, if a single section is taken out, agitation can be effected in the released portion of the tank while avoiding evaporation and odor nuisance from the remainder of the total surface of the tank due to the limited free surface of the tank. the few days of stirring. This is important because stirring will naturally cause extra evaporation.

2020

Ved tømning opnår man desuden den fordel, at man kan udnytte tankkapaciteten maksimalt, hvilket ikke er tilfældet ved de bestående konstruktioner, hvor meget at granulatet kan blive suget med ud og ydermere kan bevirke en tilstopning.When emptying, you also get the advantage that you can utilize the tank capacity to the maximum, which is not the case with the existing structures, to the extent that the granulate can be sucked out and furthermore can cause clogging.

2525

Endnu en udførelsesform er ejendommelig ved, at overdækningen ved yderranden eller yderrandene, der ligger op til tankens indervæg, er fastgjort til en flydering, der kan være opdelt i sektioner.Yet another embodiment is peculiar in that the overlay at the outer edge or outer edges adjacent to the inner wall of the tank is fixed to a float which may be divided into sections.

3030

Herved kan man opnå større tæthed end ved de kendte konstruktioner. Flyderingen og overdækningen vil bevæge sig op og ned i takt med fyldningen, og flyderingen kan passende fremstilles af et materiale, der er slidstærkt ved denne 35 bevægelse, idet man ikke vil lade nettet omslutte flyderingen. Overdækningen vil iøvrigt kunne gøres så stærk, at den 3 DK 170829 B1 vil kunne bære en person oppe, hvorved man kan hindre ulykker. Flyderingen gør det også muligt at opnå et godt greb om overdækningen under optagning af denne fra tanken, når tanken skal tømmes for sit indhold, eller når indholdet 5 skal omrøres.This allows greater density than the known structures. The float and cover will move up and down as the filling and the float can conveniently be made of a material which is durable by this movement, as it will not allow the net to enclose the float. Moreover, the cover can be made so strong that it can carry a person up, thereby preventing accidents. The float also allows a good grip on the cover while picking it up from the tank when the tank is to be emptied of its contents or when the contents 5 are to be stirred.

En videreudvikling af denne udførelsesform er ejendommelig ved, at nettets eller netsektionemes størrelse og fyldningsgrad er således valgt, at flyderingen eller flyde-10 ringssektionerne presses ud mod tankens indervæg. Herved opnås der en endnu bedre tætning.A further development of this embodiment is characterized in that the size and degree of filling of the mesh or mesh sections are chosen such that the float ring or float sections are pressed out against the inner wall of the tank. This results in an even better seal.

Ved åbne tanke kan kapaciteten forringes meget ved store regnmængder, der fortynder tankindholdet, og en videreud-15 vikling er derfor ejendommelig ved midler til opsamling og afledning af regnvand, der falder på overdækningen.With open tanks, the capacity can be greatly reduced by large amounts of rain that dilute the tank contents, and further development is therefore peculiar to means for collecting and draining rainwater falling on the cover.

Da man netop har dimensioneret overdækningen på en sådan måde, at der opnås et tætningstryk langs tankens indervæg, 20 vil overdækningen typisk være lavest på midten, og det er derfor relativt let at tilvejebringe midler til afledning af regnvand, der falder på overdækningen, samt organer til opsamling og bortskaffelse af det afledede regnvand.Since one has just dimensioned the cover in such a way that a sealing pressure is obtained along the inner wall of the tank, the cover will typically be lowest in the middle, and it is therefore relatively easy to provide means for draining rainwater falling on the cover as well as organs. for collecting and disposing of the derived rainwater.

25 De nævnte midler kan derfor med fordel udgøres af en for vand uigennemtrængelig dug, for eksempel af polyester, hvilken dug hviler på oversiden af den lukkede pose og er indrettet til at lede vandet til organerne til opsamling og bortskaffelse af regnvandet fra overdækningen, hvilke orga-30 ner er i det mindste en samlebrønd med for eksempel en pumpe og/eller et rør.The said means can therefore advantageously be constituted by a water-impermeable dew, for example polyester, which rests on the upper side of the closed bag and is adapted to direct the water to the means for collecting and disposing of the rainwater from the cover, which means -30 is at least an assembly well with, for example, a pump and / or a pipe.

Herved er det fordelagtigt, at pumpen og/eller røret er indrettet til at holde et sådant nivau af vand i samlebrøn-35 den, at dugens overflade tynges ned af samlebrønden og hælder mod denne.Hereby, it is advantageous that the pump and / or pipe is arranged to hold such a level of water in the manhole that the surface of the tab is being weighed down by the manhole and inclined towards it.

DK 170829 B1 4DK 170829 B1 4

Opfindelsen forklares nærmere under henvisning til tegningen, hvor: 5 Fig. 1 viser en åben, cirkulær tank, set fra oven, med en overdækning ifølge opfindelsen, fig. 2 viser et lodret snit i en del af den i fig. 1 viste tank, 10 fig. 3 viser en åben, cirkulær tank, set fra oven, med en anden udførelsesform for en overdækning ifølge opfindelsen, og 15 fig. 4 viser et lodret snit i den i fig. 3 viste tank.The invention is further explained with reference to the drawing, in which: 1 is a plan view of an open circular tank with a cover according to the invention; FIG. 2 is a vertical sectional view of a portion of FIG. 1, FIG. 3 is a plan view of an open circular tank with another embodiment of a cover according to the invention; and FIG. 4 shows a vertical section in the FIG. 3.

I fig. 1 og 2 er vist en åben tank med en tankvæg 1, der er cirkulærcylindrisk. Tanken indeholder gylle 2, hvorpå der 20 flyder en overdækning 3 ifølge den foreliggende beskrivelse. Ved randen af overdækningen 3 er der fastgjort en flydering 4. Overdækningen 3 består af et granuleret materiale 5, der er indesluttet i en lukket pose eller membran 6.In FIG. 1 and 2, an open tank is shown with a tank wall 1 which is circularly cylindrical. The tank contains slurry 2, on which 20 a cover 3 floats according to the present description. At the edge of the cover 3, a float 4 is attached. The cover 3 consists of a granulated material 5 enclosed in a sealed bag or membrane 6.

25 Posen 6 udgøres af et net med en maskestørrelse, der er mindre end kornstørrelsen for det granulerede materiale, der fortrinsvis er af typen LECA (registreret varemærke).The bag 6 is made up of a mesh with a mesh size smaller than the grain size of the granulated material, which is preferably of the LECA (registered trademark) type.

Et bærenet 7 er fastgjort til nettet 6, så man ved hjælp af dette kan hejse overdækningen 3 op, hvilket for eksempel 30 gøres, når tankens indhold 2 skal omrøres og/eller tømmes.A carrier network 7 is attached to the network 6 so that the cover 3 can be raised by means of this, for example 30, when the contents of the tank 2 are to be stirred and / or emptied.

Bærenettet 7 kan som vist på fig. 1 bestå af et antal reb eller tove, der er samlet indbyrdes ved tankens midte og stråler radialt ud til og er forbundet med flyderingen 4 på 35 ikke nærmere vist måde.As shown in FIG. 1 consists of a plurality of ropes or ropes assembled at the center of the tank and radially radiating to and connected to the float ring 4 in a manner not shown in detail.

5 DK 170829 B1 I fig. 3 og 4 er vist en anden udførelsesform for overdækningen ifølge opfindelsen. I denne udførelsesform er der anvendt en flydeline 7, der strækker sig diametralt i tanken og således opdeler overdækningen 3 i to lige store de-5 le. 1 hver af de to dele af overdækningen 3 er tilvejebragt midler 8 til afledning af regnvand, der falder på overdækningen 3, samt organer 10, 11, 12 til opsamling og bortskaffelse af det afledede regnvand.5 DK 170829 B1 In fig. 3 and 4, another embodiment of the cover according to the invention is shown. In this embodiment, a float line 7 is used which extends diametrically in the tank and thus divides the cover 3 into two equal parts. In each of the two parts of the cover 3, means 8 are provided for draining rainwater falling on the cover 3, as well as means 10, 11, 12 for collecting and disposing of the derived rainwater.

10 Midlerne til afledning af regnvandet er en for vand uigennemtrængelig dug 8, for eksempel af polyester, hvilken dug 8 hviler på oversiden af den lukkede pose 6 og er indrettet til at lede vandet til en samlebrønd 10, der er anbragt et stykke inden for flyderingen 4, så den kan medvirke til at 15 tynge overdækningen 3 samt dugen 8 ned til at hælde i retning mod samlebrønden 10.The rainwater drainage means is a water impervious tab 8, for example of polyester, which tab 8 rests on the upper side of the closed bag 6 and is adapted to direct the water to a manifold 10 disposed within the float 4, so that it can assist in weighting the cover 3 as well as the tab 8 downwardly towards the well 10.

Organerne til bortskaffelse af regnvandet omfatter en i samlebrønden 10 tilvejebragt dykpumpe 11, der gennem et rør 20 12 kan lænse brønden, idet dykpumpen 11 er styret af en au tomatisk niveauregulering.The means for disposing of the rainwater comprise a dive pump 11 provided in the manhole 10, which can bend the well through a pipe 20 12, the dive pump 11 being controlled by an automatic level control.

Med fordel er denne niveauregulering indstillet til at fastholde en vis vandstand i samlebrønden 10, så denne al-25 tid har en vægt, der i rimeligt omfang kan tynge dugen 8 ned, så dennes overflade altid vil have den fornødne hældning mod samlebrønden.Advantageously, this level adjustment is set to maintain a certain level of water in the manhole 10, so that it always has a weight which can reasonably weigh down the tab 8, so that its surface will always have the necessary inclination towards the manhole.

Hvis denne anden udførelsesform for overdækningen 3 er op-30 delt i to dele, vil der være en flydeline 7 for hver af delene.If this second embodiment of the cover 3 is divided into two parts, there will be a float line 7 for each of the parts.

Det er fordelagtigt, at lade det granulerede materiale være af typen LECA (registreret varemærke).It is advantageous to leave the granulated material of type LECA (registered trademark).

Claims

Cover for limiting evaporation from the surface of open tanks, for example slurry tanks, said cover comprising a granular material having a density lower than the tank content, characterized in that the granulated material (5) is enclosed in a closed bag (6).

Covering according to claim 1, characterized in that the bag (6) is made up in whole or in part of a mesh with a mesh size smaller than the grain size of the granulated material (5).

Cover according to claims 1-2, characterized in that the net (6) is attached to or enclosed in a substantially more powerful supporting net (7) which has such strength that the total cover (3) can be lifted out of tank. 20

Covering according to claims 1-3, characterized in that the covering (3) consists of several sections.

Cover according to any one of the preceding claims, characterized in that the cover (3) at the outer edge or outer edges adjacent to the inner wall (1) of the tank is fixed to a float (4) which can be divided into sections.

Covering according to any one of the preceding claims, characterized in that the size and filling degree of the cover (3) or the sections are adapted such that the float ring (4) or the floating sections are pressed out against the inner wall (1) of the tank.

Cover according to one or more of the preceding claims, characterized in that the cover (3) comprises means (8) for draining rainwater falling on the cover (3) as well as means (10, 11, 12). ) for the collection and disposal of the derived rainwater. 5

Cover according to claim 7, characterized in that the means for draining rainwater are constituted by a water-impermeable tablecloth (8), for example of polyester, which tablecloth (8) rests on the upper side of the closed bag (6) 10 and is arranged to direct the water to the means (10, 11, 12.) for collecting and disposing of the rainwater from the cover (3), which means is at least a manifold (10) with, for example, a pump (11) and / or a pipe (12)

Cover according to claim 8, characterized in that the pump (11) and / or the pipe (12) is arranged to hold a level of water in the manhole (10) so that the surface of the cloth (8) is weighed down by the manhole (10). ) and inclines toward 20 this.