Continuous drop trap for mass-transfer columns

FIELD: process engineering.

SUBSTANCE: invention relates to device intended for separation of gas (vapour) phase from trapped fluid drops in mass transfer gas-fluid columns. Drop trap for mass transfer columns comprises rings assembled to chains. Rings feature different diameter. Note here that said rings are assembled in different-length chains suspended vertically from the grate. Note here that long chains contact with lower end of fluid top distribution device.

EFFECT: decreased fluid (drop) carry over by gas (vapour) flow at lower drop.

1 dwg

 

The technical field to which the invention relates.

The device is intended for the separation of gaseous (vapor) phase from the captured droplets of liquid in the column gas-liquid mass transfer devices.

The level of technology

For separation (separation) gas flow (pair) from drops are widely used ring process, replacement, layer installed on the grid in the upper part of the device [1, 2]. In common with the proposed design is of annular form elements and the grill. The disadvantage is a very large hydraulic resistance created by the ring process.

As the droplet separator is also used grid nozzle designed for separation (separation) of gas (vapor) from the droplets [3]. She is a sleeve mesh rolled.

In common with the proposed design is the presence of the grid structure of closed elements arranged vertically.

Disadvantages grid nozzles: shortness of leaking fluid on the nozzle down, as well as the effect of "sponge", when the nozzle starts to accumulate and release the liquid, which affects the separation efficiency, but also creates a lot of resistance (in case of accumulation of fluid).

As the prototype is set to the invention, disclosed in RU 2035991 C1, 27.05.1995, from which the famous droplet separator for separation columns, in the with closed elements, and closed elements represent a ring of the same size, collected in the chain of the same length. In common with the proposed design is the presence of closed elements (rings), collected in the chain.

The disadvantage of the prototype is increased cableone gas flow and increased again cableone.

Disclosure of inventions

Object of the invention is the creation of new high-efficiency does not create a large hydraulic resistance of the droplet separator for separating gas (vapor) from the captured droplets of liquid in the column gas-liquid mass transfer devices.

The technical result of the invention is the reduction of Kaplunova flow of gas (steam), improving plant performance by reducing the hydraulic resistance.

Eliminate these drawbacks and achieve the claimed technical result from implementation of the chain of the droplet separator for separation columns containing chains of closed elements (rings), is ensured by the fact that rings of different sizes are collected in chains of different lengths (2 - short chain, 3 long chains), chains hanging from the lattice (1) (figure 1). Are chains of two types - long and short. Ring size long chain increases down the chain as shown in figure 1. The lower ring chain is the largest in diameter. W is the second ring, counting from the bottom end of the chain, has a diameter of 1.5-2 times smaller than the diameter of the lower ring. The third circle, counting from the bottom ring chain, has a diameter of 1.5-2 times smaller than the diameter of the second ring. All subsequent rings have the same diameter equal to the diameter of the third ring, counting from the bottom end of the chain. Short circuit in 1.2 times shorter than the long chains and consist of different diameter rings. The diameter of the lower ring short circuit equal to the diameter of the lower ring long chain. The second ring short circuit, starting from the lower end of a short chain, has a diameter of 1.5-2 times smaller than the diameter of the lower ring short circuit. All other rings of the same diameter, which is 1.5-2 times smaller than the diameter of the second ring. The specified ratio of the sizes of the rings and lengths of chains allows optimum positioning of the chain section of the column, to ensure the effective separation of gas from liquid droplets and reduce cableone flow of gas (steam). Long and short chains are cross-sectional columns in a checkerboard pattern, with the proportion of long chains to the number of short chains 1:1, that is, 50% of long chains and 50% short. The length of the longest chain is equal to the distance between grid 1 (Fig 1) and the upper switchgear liquid 5. The number of long chains in the longitudinal axial section of the column (shown in figure 1) is determined from the condition: n=D/d, where D is the internal diameter of the column, m; d - the diameter of the lower link in the long chain; n is the number of long chains in the longitudinal axial section of the column. The diameter of the lower ring long chain is selected from the range of 0,02-0,06 m of the Diameter of the lower ring long chain chosen from a specified range depending on the load of the column for gas (pair), size of brythonic and properties of a gas (vapor) and liquid.

To prevent re-entrainment of the ends of long chains of 3 touch the top of the switchgear fluid. In this case, the stream of fluid flowing from the circuit goes directly on top switchgear fluid. Figure 1 is a casing walls marked 4, the upper switchgear fluid denoted by 5. The upper distribution device consists of a pipe with holes for the passage of fluid. The fluid enters at the top of the distribution device of a liquid and exits through holes in the form of multiple jets. The upper distribution device 5 is designed for uniform distribution of the liquid over the cross section of the device.

Brief description of drawings

Figure 1. Chain droplet separator for separation columns. Figure 1 shows a diagram of the chain of the droplet separator for separation columns.

The distinguishing feature of the claimed invention is that the chain is made of different lengths, and rings that make up the ETUI, have a different diameter, increasing down the chain, and the ends of long chains touch the top of the switchgear liquid.

Chain droplet separator is placed in the upper part of the column gas-liquid mass transfer apparatus (absorbers, desorbers, distillation columns). The principle of the device is that when the flow of gas (vapor) through the chain droplet separator the direction of motion of the gas is continuously changing due to the curvature of the channels formed by the chains. Due to the inertial forces of the droplets deposited on the surface of the circuit flowing film on the links of the chains down. Chains have different lengths. Large low-set rings are designed to capture the largest drops of liquid. Small ring located at a higher level, catch small drops. This allows to reduce cableone flow of gas (steam). To prevent re-entrainment of the ends of long chains touch the top of the switchgear liquid.

Chain droplet separator has a high free volume (to 0.93), which allows to reduce the hydraulic resistance and increase performance.

Comparative analysis of the prototype and the proposed device shows that its distinguishing feature is that the rings are different sizes collected in the circuit passing the second length, which are suspended vertically to the bars, and the ends of long chains in contact with the upper switchgear liquid.

The implementation of the invention

Experimental studies in laboratory scale showed that the chain droplet separator is 7-8 times smaller hydraulic resistance than the ring process and greater specific surface area (up to 500 m2/m3).

This device has a low hydraulic resistance due to the fact that the liquid is not retained on the links, and freely flows down. This allows you to increase the plant capacity by reducing the hydraulic resistance. Chain droplet separator reduces cableone (or entrainment of liquid from the apparatus by the flow of gas (steam).

Literature

1. Kasatkin A.G. Basic processes and apparatuses of chemical technology. - M.: 1973, 754 S.

2. Dynarski SCI Basic processes and apparatuses of chemical technology. Manual on design. Moscow, Chemistry, 1983, pp.272.

3. Website: www.metaprom.ru.

The droplet separator for separation columns, including rings collected in the circuit, characterized in that the rings have different diameters, and the rings are assembled in a chain of different length, which are suspended vertically to the grid, and long chain touching the lower end of the upper distribution condition the device of the liquid.



 

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