RU2053009C1 - Device for removing gas out of water - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: device has branch pipe 1 for supplying deaerated liquid, housing 3 inside which the cavity of lowered pressure is formed and pipes 4 made of metal ceramics, placed in housing 3 and united by input 2 and output 6 collectors. Hydrophobic material 5 is disposed on the inner surface of pipes 4. Drain branch pipe 7 for drainage of the soaking through liquid and branch pipe 8 for the suction of gas separated through pipes 4 into the cavity of housing 3 are attached to housing 3. Pipes 4 can be made along helical line and have elliptical flow area. EFFECT: enhanced efficiency of degasification and reduced dimensions of device. 1 cl, 5 dwg

Description

 The invention relates to techniques for purifying water, process liquids and industrial wastewater from dissolved gases, can be used for degassing a coolant in urban heating systems.

 Known devices for degassing liquids, made in the form of a vacuum degasser, containing a vertical cylindrical body with a lid and a bottom, a dispensing device for a supply fluid, a bubble chamber, nozzles for supplying a source liquid and removing a vapor-gas mixture, a steam generator, a vacuum pump, etc.

 The disadvantages of such devices are large dimensions, low degassing efficiency, the difficulty of maintaining the required vacuum and the corresponding temperature of the deaerated water.

 The closest in technical essence to the proposed device is a device for removing gas from water, comprising a housing in which pipes with hydrophobic material are located on the inner surface of the pipes, input and output collectors.

 The purpose of the invention is improving the efficiency of degassing liquids.

 The goal is achieved by profiling pipes (fluid supply paths) and an appropriate choice of pipe material. The essence of the proposal is that the pipes for the passage of the degassed liquid are made of a material that passes gases and retains liquid. For example, a similar phenomenon is observed when a liquid saturated with hydrogen passes through pipes made of cermet, including palladium. For complete degassing, pipelines are made of fine porous material. When a liquid with gases dissolved in it is supplied to such a pipeline under certain pressure, the pores of the walls of the water supply system are “locked” for the liquid phase and intense gas evolution begins through the pipe walls. To reduce fluid leakage through the pores of the wall, the inner surface of the pipe is coated with a hydrophobic coating that allows gas to pass through. It is known that to increase the efficiency of degassing, it is necessary to increase the contact surface of the phases and increase the passage of liquid through the degassing zone. The first is achieved by the implementation of pipes in the degassing zone in the form of an oval (for example, an ellipse with an axis ratio of 1-3/10).

 On the other hand, changing the profile of the pipe reduces the integral characteristic of the gas passage of the liquid phase to the phase contact surface. In addition, to intensify gas evolution, pipes made of porous material are placed in an evacuated cavity.

 To increase the residence time of the liquid in the degassing zone, the pipes are made in the form of a coil, the cylindrical sections of which have different but constant porosity for each section, which makes it possible to optimize the degassing process depending on the characteristics of the water passing through this linear section of the coil.

 In FIG. 1 shows a device for degassing a liquid, a section; in FIG. 2, section AA in FIG. 1, a cross section of a pipe in a degassing zone; in FIG. 3 device for degassing a liquid, the pipe supplying degassed liquid which is made in the form of a coil; in FIG. 4 section BB in FIG. 3; in FIG. 5 section BB in FIG. 3.

 The device consists of a pipe 1 for supplying a degassed liquid, and a booster compressor, a collector 2, a housing 3 forming an evacuated cavity in which pipes 4 are located, the working elements of a degasser made of a porous material, the inner surface of which is coated with a hydrophobic coating 5, is installed on the inlet pipe 1; Pipes 4 hydraulically connect the pipe 1 to the manifold 6 of the outlet of the degassed liquid. A pipe 7 is tightly connected to the housing 3 for draining the leaked liquid and a pipe 8 for suctioning the gas released from the water.

 The device operates as follows.

 The degassed liquid under the necessary pressure is supplied through the pipe 1 to the intake manifold 2, from where it is supplied through the pipes 4 to the output manifold 6. In this case, when the liquid moves along the porous surface of the pipe 4 under pressure, the gas dissolved in water flows through the pores of the pipe 4 into the body 3. The pores of the walls of the pipe 4 at a certain pressure are “closed” for the leakage of fluid. For the same purpose, to reduce the amount of fluid leaking through the pores, the inner surface of the pipe 4 is coated with a hydrophobic coating 5, which reduces the amount of fluid leaking through the pores. Due to the ellipse section of the pipe 4 (Fig. 2), the contact time of each elementary portion of degassed water with the degassing surface is increased. Degassed water then enters the collector 6 of the drainage of degassed liquid and to consumers. From the cavity of the housing 3 through the nozzle 7, the leaked liquid is drained and the nozzle 8 is sucked off by the evolved gas.

 The degassing efficiency is determined by the cross-sectional area of the pipe 4 (Fig. 1), their number and length, and the characteristic of the phase contact zone. The specified parameters for each specific case are easily optimized.

 Since the residence time of the liquid in the degassing zone significantly affects the degree of degassing, the pipe 4 is made in the form of a coil (Fig. 3). The main positions in FIG. 3 correspond to the positions of FIG. 1 both in terms of design and function, and in function. Moreover, since when the fluid moves through the pipe 4 (Fig. 3), the degree of degassing of the liquid increases, each subsequent linear element of the pipe is made with a different degree of porosity than the previous ones.

 Since the turbulization of the liquid increases the degree of degassing, for this purpose the pipe 4 is made with an oval bore, varying along each linear section (Fig. 3) along a helical line (Figs. 4 and 5). When fluid moves through such a pipe, the fluid is turbulent, the gas suction rate increases.

 Thus, the proposed device for degassing has smaller overall dimensions, is structurally simpler, has improved degassing characteristics, low energy consumption, since it does not require special heating of the liquid or the use of steam.

Claims (2)

 1. DEVICE FOR REMOVING GAS FROM WATER, including a housing in which pipes with hydrophobic material are located on the inner surface of the pipes, inlet and outlet manifolds combining the pipes and connected to the inlet and outlet nozzles, characterized in that it is equipped with a compressor mounted on the inlet pipe, the pipes are made in the form of a ceramic-metal coil with variable porosity along the length of the pipes and have a cross section.  2. The device according to claim 1, characterized in that the oval cross-section of the pipes is located along a helical line.

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