RU2200134C2 - Vacuum deaeration unit for water - Google Patents

Abstract

FIELD: petroleum industry, heat engineering, food-processing industry etc. SUBSTANCE: deaeration unit has degasser made in the form of vortex device having outlet part formed as converging tube, which is gradually converted into diffuser in the direction of water flow. Degasser has water supply branch pipe, water discharge branch pipe and gas discharge branch pipe. Unit has pumping out plant for creating vacuum in degasser and water pump. Additional vortex device may be mounted at degasser inlet end. Additional pump may be mounted between degasser and pump, and inlet end of additional pump may be connected through recirculation pipe to inlet end of additional vortex device. EFFECT: increased efficiency in converting water kinetic energy into pressure energy and, accordingly, reduced power consumed by pump. 3 cl, 1 dwg

Description

 The invention relates to techniques for water degassing and can be used to remove dissolved gases from water in the oil, energy, food and other sectors of the economy.

 Vacuum deaerators used in the energy industry and using the method of thermal deaeration of water are known (see I.A. Trub, O.P. Litvin "Vacuum deaerators", M., "Energy", 1967).

 Known installations of vacuum deaeration of water, operating on the principle of the so-called "cold" deaeration (see AS 1407503, 1458319, 1535833, class B 01 D 19/00).

 One of them, known from the copyright certificate 1535833, class B 01 D 19/00, from 09.03.88, adopted as a prototype.

 The installation contains a degasser, made in the form of a metal column with pipes for supplying water, water and gas. Inside the degasser, a sprinkler, a nozzle, a water level regulator are placed.

 The installation includes a pumping device that creates a vacuum in the degasser (vacuum pump), as well as a pump pumping water from the degasser.

 A disadvantage of the known installation is its low efficiency, due to the bulkiness and metal consumption of the degasser-column, as well as the complexity of its design (inside the column there is a sprayer, nozzle, level control, etc.).

 Large dimensions lead to the possibility of depressurization, to the need for constant monitoring, i.e. additional work to maintain tightness.

 In addition, the vertical design of the degasser-column requires a large capacity pumping pump, because all energy supplied to the degasser is lost.

 The problem to which this invention is directed, is to create a more economical, simple, compact and efficient installation.

 The essence of the invention lies in the fact that in the known installation of vacuum deaeration of water, including a degasser with nozzles for supplying and discharging water and gas, a pumping device that creates a vacuum in the degasser, a pump pumping water out of the degasser, according to the invention, the degasser is made in the form of a vortex device, the outlet part of which has the shape of a confuser, passing in the direction of movement of water into the diffuser.

 The proposed degasser is simpler in design and more compact, because the degassing process occurs in it more intensively. This allows you to reduce the power of the pump out of the pump.

 Also new is the fact that an additional vortex device is installed at the entrance to the degasser.

 This additionally intensifies the degassing process, since a mixture of water and gases released in the additional vortex device is supplied to the inlet of the main degasser. Gases, having a low density, are energetically pushed by centrifugal forces to the center of the degasser, which creates a rapid bubbling in it.

 In addition, in the proposed installation between the degasser and the pump pumping water out of it, an additional pump is installed, the output of which is connected via a recirculation pipeline to the input of the additional vortex device.

 This increases the depth of deaeration, as the recirculation loop is under atmospheric pressure (under vacuum), which leads to an increase in the time spent by degassing water under vacuum.

 The drawing shows a diagram of the installation of vacuum deaeration of water.

 Installation of vacuum deaeration contains a degasser 1 with nozzles 2 and 3 for supplying and discharging water and a nozzle 4 for exhausting gas, a pumping device 5 that creates a vacuum in the degasser 1, a pump 6, pumping water from the degasser 1.

 The degasser 1 is made in the form of a vortex device, the output part of which has the form of a confuser 7, passing in the direction of water in the diffuser 8.

 The installation contains an additional vortex device 9, installed at the entrance to the pipe for supplying water 2 to the degasser 1, and an additional pump 10, installed between the degasser 1 and the pump 6, pumping water out of it. The output of the additional pump 10 using the recirculation pipe 11 is connected to the input of the additional vortex device 9.

Installation works as follows:
The deaerated water is supplied by a pumping device 5 through an additional vortex device 9 and a water supply pipe 2 to the vortex degasser 1. In this case, in the additional vortex device, due to lower pressure on the periphery compared to atmospheric pressure and an even greater decrease in pressure in the axial region, dissolved in water her gas. The input 2 of the vortex degasser 1 receives a mixture of water and released from it in the form of gas bubbles. In the vortex degasser 1, this mixture is twisted, passes through the housing and enters the outlet part, consisting of confuser 7 and diffuser 8. Under the action of centrifugal forces, a deep vacuum (more than 0.95 • 10 ⁵ Pa) is established in the center of the degasser and dissolved there is gas in it. At the same time, from the gas-air mixture received into the degasser 1 under the action of centrifugal forces, gas bubbles are vigorously displaced to the center, causing additional turbulence of the water collected at the periphery of the vortex degasser 1. This intensifies the degassing process. Gases collected in the central region of the vortex degasser 1 are removed from it by a pumping device 5 into the atmosphere.

 In the output part of the degasser 1, due to the diffuser part 8, the kinetic energy of degassed water is converted into pressure energy. This significantly reduces the power of the pump 6, which is required for the operation of the installation. In the confuser part 7 of the output compartment, the kinetic energy of the rotational movement of water is converted into the kinetic energy of the radial movement, which ensures an uninterrupted flow in the diffuser part 8 of the output compartment. As a result, the kinetic energy of water is effectively converted into pressure energy and a corresponding decrease in the power of the pump 6, at the inlet of which a small vacuum is maintained.

 An additional pump 10 is installed to organize the recirculation flow through the pipe 11. In this case, the vacuum is maintained in the entire recirculation circuit, which includes elements 10, 11, 9, 2, 7, 8, 3 (it is different in different elements).

 The economic effect is achieved due to the use in the installation of a degasser of a fundamentally different design, simpler, more compact, ensuring the passage of the deaeration process in a more intensive mode.

Claims (3)

 1. Installation of vacuum deaeration of water, containing a degasser with nozzles for supplying and discharging water and gas, a pumping device that creates a vacuum in the degasser, a pump pumping water out of the degasser, characterized in that the degasser is made in the form of a vortex device, the outlet of which has the shape of a confuser passing in the direction of water in the diffuser.  2. Installation according to claim 1, characterized in that an additional vortex device is installed at the entrance to the degasser.  3. Installation according to paragraphs. 1 and 2, characterized in that between the degasser and the pump pumping water out of it, an additional pump is installed, the output of which is connected via a recirculation pipe to the input of the additional vortex device.