RU221080U1 - INTERNAL DEVICE FOR THIN-LAYER SETTENTS - Google Patents

Abstract

The utility model relates to equipment for separating emulsions and suspensions, and can be used in chemical, petrochemical and other industries.

An internal device for thin-layer sedimentation tanks is proposed, which is a system of alternating gutters with inclined walls and tops facing up and down; at the tops of the gutters there are channels located in a vertical plane in the direction transverse to the axis of the gutters, connecting the tops of the gutters with the tops of the gutters of the next layer, at the end of the channels there are gaps between the walls of the channels and the walls of the gutters of the next layer, the gutters are assembled from inclined plates with vertically bent edges that form the walls of the channel, the plates are interconnected by connecting elements that simultaneously provide the required distance between the walls of the channel and act as transverse partitions in a channel in which, according to the utility model, the edges of the plates are bent up and down with a rounding.

The technical result is to reduce the likelihood of clogging the gap between the channel wall and the walls of the gutters and, accordingly, increase the time interval between cleaning the sump.

Description

The utility model relates to equipment for separating emulsions and suspensions, and can be used in chemical, petrochemical and other industries.

Thin-layer sedimentation tanks are known, in which there is a set of horizontal or inclined plates located in the body of the apparatus. The sump has additional devices for securing the plates in the desired position. (RF Patent No. 2145513, Horizontal cylindrical shelf settling tank, published 02.20.2000, Bulletin No. 5.)

It is known that the productivity of settling tanks depends on the settling area, and thin-layer settling tanks make it possible to obtain a large settling area in devices of a relatively small size. In addition, the Reynolds number is significantly reduced, which makes it possible to obtain a laminar flow mode at a higher flow rate, and the internal devices of the thin-layer settler prevent mixing of the liquid in the vertical direction. These features improve settling conditions. During settling, solid particles can linger and accumulate on horizontal sections of the internal devices of the settling tank, therefore inclined elements are used.

The closest analogue (prototype) is the internal device for thin-layer sedimentation tanks, which is a system of alternating gutters with inclined walls and tops facing up and down; at the tops of the gutters there are channels located in a vertical plane in the direction transverse to the axis of the gutters, connecting the tops of the gutters with the tops of the gutters of the next layer, at the end of the channels there are gaps between the walls of the channels and the walls of the gutters of the next layer, the gutters are assembled from inclined plates with vertically bent edges that form the walls of the channel, the plates are connected to each other by connecting elements that simultaneously provide the required distance between the walls of the channel and act as transverse partitions in the canal. (RF patent for invention No. 2688341, Internal device for thin-layer sedimentation tanks, published May 22, 2019, Bulletin No. 15.)

In these internal devices, high settling efficiency is achieved by moving settled particles or droplets between layers and preventing the settled particles or droplets from re-entering the liquid layer at the outlet of the thin-layer settling unit. Internal devices allow the simultaneous separation of particles with a density higher and lower than the density of the liquid. In addition, the design of thin-layer sedimentation tanks is simplified, and it becomes possible to use the same type of internal devices in thin-layer sedimentation tanks of various purposes and sizes.

The problem with thin-layer sedimentation tanks is the accumulation of sediment on inclined surfaces. Even at large inclination angles, some sediment particles stick to the surface or to other particles, and a layer of sediment is formed, the thickness of which gradually increases. The accumulation of a layer of sediment leads to a decrease in the size of the gap, and then to complete overlap. Two types of sediment layer movement are possible. Gradual sliding of the sediment layer and a sharp separation of the sediment layer from the surface, for example, due to dynamic effects when the fluid flow rate changes, and rapid sliding of the sediment layer. With a large thickness, the moving layer of sediment can completely close the gap between the walls of the channels and the walls of the gutters of the next layer. In addition, a layer of sediment may pass through the gap and block the vertical channels. Clogging of the gaps between the walls of the channels and the walls of the gutters of the next layer and vertical channels disrupts the performance of the thin-layer settling tank.

The objective of the utility model is to create a new internal device for thin-layer sedimentation tanks with the achievement of the following technical result: reducing the likelihood of clogging the gap between the channel wall and the walls of the gutters and, accordingly, increasing the time interval between cleaning the sedimentation tank.

The technical result is achieved by the fact that in the known internal device for thin-layer sedimentation tanks, which is a system of alternating gutters with inclined walls and tops facing up and down, at the tops of the gutters there are channels located in a vertical plane in the direction transverse to the axis of the gutters, connecting the tops of the gutters with the tops of the gutters of the next layer, at the end of the channels there are gaps between the walls of the channels and the walls of the gutters of the next layer, the gutters are assembled from inclined plates with vertically bent edges that form the walls of the channel, the plates are interconnected by connecting elements that simultaneously provide the required distance between the walls of the channel and perform the function of transverse partitions in the channel, according to the utility model, the edges of the plates are bent up and down with a rounding.

The fact that the edges of the plates are bent up and down with a rounding leads to the following results. The configuration of the gap between the walls of the channels and the walls of the gutters of the next layer changes. The gap is between the channel wall and the rounded part of the plates. Sediment particles move along the inclined part of the gutter, and then along the rounded part and fall into the gap and then into the vertical channel “from top to bottom”. In the rounded part, the angle of inclination gradually increases and the likelihood of particles sticking and the gap becoming overgrown decreases. When the sediment layer slides or moves quickly along the rounded part, the layer begins to bend and crack in the upper part. The sediment layer is broken into relatively small pieces and the likelihood of clogging the gap between the channel wall and the walls of the gutters, as well as vertical channels, is reduced. With the gradual accumulation of a sediment layer, the angle of inclination of the surface of the sediment layer is higher than that of the inclined part of the plates and in the upper part of the gutters the sediment layer is thickest.

The fact that the edges of the plates in the upper part are bent with a rounding reduces the maximum thickness of the sediment layer and the likelihood of clogging the gaps when the sediment layer quickly slides.

In fig. 1 shows an internal device for thin-layer sedimentation tanks, in which the edges of the plates are bent up and down with a rounding.

In fig. Figure 2 shows the relative arrangement of the elements of two layers of internal devices for thin-layer sedimentation tanks.

The internal device for thin-layer sedimentation tanks, which is a system of alternating gutters, is assembled from inclined plates 1 with edges bent vertically up and down. The plates are connected to each other by connecting elements 2. The edges of the plates are bent up and down with a rounding 3 and form the walls of a vertical channel 4. At the end of the channel 4, there are gaps 5 between the wall of the channel and the wall of the gutters of the next layer. Connecting elements 2 connect the plates 1 and at the same time provide the required the distance between the walls of the channel 4 and serve as transverse partitions in the channel.

The liquid to be cleaned moves along the chute, due to the difference in density, the particles settle or float up and reach the inclined surface of the plates 1. Next, the particles move along the inclined surface, fall on the curve 3 and through the gap 5 enter the vertical channel 4. Connecting elements 2 perform the function of transverse baffles in channel 4, so the sediment in channel 4 moves vertically and exits through the bottom or top of the thin-layer settling unit. Some particles may stick to the surface and a layer of sediment may gradually accumulate on the inclined part of the plates 1. On curve 3, the angle of inclination gradually increases and the probability of particles sticking and filling of gap 5 decreases. When the sediment layer moves along curve 3, the layer begins to bend and crack in the upper part. The sediment layer breaks into relatively small pieces and the likelihood of clogging the gap 5 and vertical channels 4 is reduced. With the gradual accumulation of the sediment layer, the angle of inclination of the surface of the sediment layer is higher than that of the inclined part of the plates 4, and in the upper part the thickness of the sediment layer increases. The presence of the rounding 3 reduces the maximum thickness of the sediment layer and the likelihood of clogging the gaps 5 during rapid sliding of the sediment layer.

Thus, the fact that the edges of the plates 1 are bent up and down with a rounding 3 reduces the likelihood of clogging the gap 5 between the channel wall and the walls of the gutters and, accordingly, allows you to increase the time intervals between cleaning the sump.

Claims (1)

An internal device for thin-layer sedimentation tanks, which consists of alternating gutters with inclined walls and tops facing up and down, which are assembled from inclined plates with vertically bent edges, interconnected by connecting elements that, together with the bent edges of the plates, form channels located in a vertical plane in direction transverse to the axis of the gutters, characterized in that the edges of the plates are bent up and down with a rounding.

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