RU2636996C2 - Catalytic method of removing oxygen from water - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: catalytic method of removing oxygen from water, wherein the raw water is purified of mechanical impurities and fed to the injector, where it is mixed with hydrogen gas, a water-hydrogen mixture is produced and deoxygenated by reaction with an ion exchange material containing a palladium catalyst, characterized in that the bubbles of hydrogen gas in the water-hydrogen mixture are crushed and completely dissolved in water by means of a vortex layer device with ferromagnetic needles, under the influence of an alternating electromagnetic field.

EFFECT: increasing the efficiency of the catalytic method of removing oxygen from water, when it interacts with dissolved hydrogen gas on grains of highly basic anion exchanger coated with a layer of metallised palladium.

1 dwg

Description

The invention relates to the field of energy and can be applied in various fields of technology and, above all, for the preparation of water for power plants and heat supply systems of consumers.

A known method of thermal deaeration of water (RF patent for the invention No. 224208, IPC F22D 1/50, publ. 10.01.2005), by which feed water and a heating agent are supplied to the deaerator, deaerated water and vapor are removed from the deaerator, the residual oxygen content is measured in deaerated water, the pulse from the oxygen content sensor is transmitted to the evaporator flow regulator, from which, in turn, a control signal is transmitted to the actuator of the evaporator flow regulator, while a pulse is simultaneously supplied to the vapor regulator from the sensor of the residual content of carbon dioxide in deaerated water, and the regulation of the flow rate of the vapor is carried out according to a given value of the residual content of the removed gas, to achieve which a larger amount of vapor is required.

The disadvantages of this method is the need to use thermal energy to heat the treated water to a state of saturation, the use of measures to increase the mass transfer surface, maintaining a constant pressure of deaerated water and a minimum partial pressure of oxygen above its free surface. The implementation of the method of thermal deaeration of water requires the use of complex and expensive deaerators and auxiliary equipment.

There is also a method of removing dissolved oxygen from water (VV Vasiliev et al. Study of a method for removing oxygen from water using an ion exchanger containing palladium as a catalyst. Energy Saving and Water Treatment. No. 1 (51). 2008, p. 23 -25), according to which hydrogen gas is injected into the treated water, hydrogen bubbles are dissolved in the water and the dissolved oxygen is catalytically reduced by passing water through an ion exchange resin containing a palladium catalyst. The catalytic process of the interaction of oxygen and hydrogen dissolved in water is described by the equations:

2H ₂ + O ₂ → 2H ₂ O

Or taking into account the catalyst - palladium:

KO+H₂→K+H₂O,

KO + H ₂ → K + H ₂ O,

where K is palladium, H is hydrogen, O is oxygen.

The disadvantage of the described catalytic method, adopted as a prototype of the invention, is the reduced rate of dissolution of injected hydrogen bubbles in water, leading to an excess of its flow rate over stoichiometric, a decrease in the kinetic reaction rate and the performance of deoxygenation plants operating in this method.

The objective of the proposed technical solution is to increase the efficiency of the catalytic method for removing oxygen from water during its interaction with dissolved gaseous hydrogen on grains of highly basic anion exchange resin coated with a layer of metallized palladium.

The problem is solved due to the fact that the source water is cleaned of mechanical impurities and fed to the injector, where it is mixed with hydrogen gas, a water-hydrogen mixture is obtained and deoxygenated by reacting with an ion-exchange material containing a palladium catalyst, while hydrogen gas bubbles in a water-hydrogen mixture, they are crushed and completely dissolved in water using a vortex layer apparatus with ferromagnetic needles mounted rotatably under the influence of a variable th electromagnetic field.

A diagram of a device for implementing the catalytic method for removing oxygen from water, working by the proposed method, is shown in the drawing.

The device comprises a source water pipe 1, a mechanical water filter 2, a purified water pipe 3, an injector 4, a pipe 5, an electrolyzer 6, a rectifier 7, an oxygen pipe 8, a hydrogen pipe 9, a vortex electromagnetic apparatus 10, an electric network 11, a catalytic filter 12, deoxygenated water pipe 13.

The implementation of the catalytic method for removing oxygen from water is carried out in the invention as follows.

The source water containing dissolved oxygen, through the pipeline 1 of the source water is sent to the filter 2, where it is purified from mechanical impurities. The purified water is fed through the pipeline 3 to the nozzle of the injector 4, it is expanded in the nozzle with an increase in speed and a decrease in its static pressure in the mixing chamber of the injector 4. Through the pipeline 5, part of the flow rate of the purified feed water is supplied to the electrolyzer 6, which is supplied with direct current through the rectifier 7. B electrolyzer 6 decompose water into gaseous hydrogen and oxygen. The released oxygen through the oxygen pipe 8 is discharged into the atmosphere. Hydrogen gas through a hydrogen pipeline 9 is fed into the mixing chamber of the injector 4, where it is pre-mixed with purified water and the formation of hydrogen bubbles in it. In a vortex electromagnetic apparatus 10, when the treated water is passed through a layer of rotating ferromagnetic needles, finely divided hydrogen bubbles are crushed with the completion of their dissolution in water. The inductors of the vortex electromagnetic apparatus 10 are supplied with alternating current from the electric network 11. Water with hydrogen dissolved in it is supplied to the catalytic filter 12 and passed through a layer of highly basic anion exchange resin consisting of grains whose surface is metallized with palladium. In the catalytic filter 12, a catalytic reaction between oxygen and hydrogen molecules dissolved in water is carried out with the formation of additional H ₂ O water molecules. The reacted water is sent to the consumers via a deoxygenated water pipeline 13.

The proposed catalytic method for removing oxygen from water allows you to:

- due to the intensification in the vortex layer apparatus of the process of mixing bubbles of injected hydrogen in water, increase the speed and completeness of their dissolution in water to obtain the optimal stoichiometric composition of dissolved hydrogen and oxygen (about 1 g H ₂ per 8 g O ₂ in one cubic meter of water);

- reduce the amount of hydrogen consumed, simplify and reduce the cost of the installation, working on this method;

- to produce gaseous hydrogen directly in the plants for the catalytic removal of oxygen from water by electrochemical decomposition of part of the treated water into hydrogen and oxygen.

Claims (1)

A catalytic method for removing oxygen from water, according to which the source water is purified from mechanical impurities and fed to the injector, where it is mixed with hydrogen gas, a water-hydrogen mixture is obtained and deoxygenated by reacting with an ion-exchange material containing a palladium catalyst, characterized in that hydrogen gas bubbles in a water-hydrogen mixture are crushed and completely dissolved in water using a vortex layer apparatus with ferromagnetic needles installed with the possibility of growth under the influence of an alternating electromagnetic field.

Images