RU2339582C1 - Deaerator impulse 8 - Google Patents

Abstract

FIELD: chemistry, engines and pumps.

SUBSTANCE: deaerator contains tank-accumulator with branch pipe for pumping out non-condensing gases and installed above it column in form of water-jet ejector with water-supplying device, made in form of evenly placed on column section sprayers and vapour-feeding collector, made circular and connected with column with radial bridges. In tank on outlet from column cone-shaped drop-impingement plate is installed. Column is divided with vertical partitions into sections, successively connected to each other along vapour-gas route through separation device, column being made from at least two units, connected parallelly on vapour and removed gas. Sprayers are made in form of acoustic sprayers and contain case with located inside generator of acoustic fluctuations in form of nozzle and resonator, pipes for air and liquid. Case of sprayers is made in form of vertically placed cylindrical bush, in whose upper part there is a pipe for air supply, and perpendicularly to its axis there is a pipe for liquid supply. Inside case, coaxially to it bush with upper and lower flange is rigidly fixed, lower flange being rigidly fixed in made in case growing-through. Inside bush, coaxially to it, there is rod with diameter d, on whose end ring volumetric resonator, made in form of cup with conical surface, is pressed in, and in tail part of rod, fixing discs are placed, which interact with inner surface of bush. In lower flange at least one nozzle is located at angle to resonator axis, its value lies within range 20°÷40°, extension of nozzle axis lies on circumference, located in medium part of conical surface of resonator.

EFFECT: increase of productivity due to thin spraying of liquid.

2 dwg

Description

The invention relates to the field of thermal deaeration of a liquid, mainly feed water of a steam turbine unit, and can be used in thermal and vacuum deaeration plants, as well as in strippers of gaseous products dissolved in process liquids.

The closest technical solution to the claimed facility is a deaerator according to USSR copyright certificate No. 553215, class. CO2B 1/10. 1975, containing a storage tank with a nozzle for suction of non-condensable gases and a column mounted above it in the form of a water-jet ejector with a water supply device made in the form of a column of acoustic nozzles evenly spaced along the section, and a steam supply collector made circular and connected to the column by radial jumpers, and in the tank at the outlet of the column there is a conical drop eliminator.

A disadvantage of the known device is the low hydraulic resistance and low quality of deaeration associated with coarse atomization of the liquid, as well as low productivity.

EFFECT: increased productivity due to fine atomization of liquid.

This is achieved by the fact that in a deaerator containing a storage tank with a nozzle for suction of non-condensable gases and a column mounted above it in the form of a water-jet ejector with a water supply device made in the form of nozzles evenly spaced along the section of the column, and a vapor supply manifold made annular and connected to the column radial jumpers, and in the tank at the outlet of the column there is a cone-shaped drop eliminator, the column is divided by vertical partitions into sections connected in series between battle along the gas-vapor path through a separation device, the column being made of at least two blocks connected in parallel along the steam and exhaust gas, and the nozzles are made in the form of acoustic nozzles containing a housing with an acoustic oscillator located inside the nozzle and resonator, tubes for air and liquid supply, the housing being made in the form of a vertically arranged cylindrical sleeve, in the upper part of which there is a tube for air supply, and a pipe is perpendicular to its axis for supplying fluid, and inside the housing, coaxially to it, a sleeve with upper and lower flanges is rigidly fixed, while the lower flange is rigidly fixed in the groove made in the housing, and inside the sleeve, coaxially with it, there is a rod of diameter d, at the end of which is pressed an annular volume resonator made in the form of a cup with a conical surface, and fixing disks interacting with the inner surface of the sleeve are located in the rear part of the shaft, and at least one nozzle is located in the lower flange at an angle the resonator axis, whose value lies in the following range of values: 20 ° ÷ 40 °, with the continuation of the nozzle axis lies on a circle located in the middle part of the conical surface of the resonator.

1 shows a deaerator; figure 2 is a diagram of an acoustic nozzle.

The deaerator contains a column 1 mounted above the storage tank 2, divided by vertical partitions 3 into three sections 4, 5, 6. An annular steam supply manifold 7 is connected to the column by radial jumpers 8. Acoustic nozzles 9 are located in each section. The sections are interconnected via a separation the device formed in this case by partitions 3. For the drainage of water from column 1 to the tank 2, nozzles 10 are used, and for the removal of non-condensable gases pipe 11. The system for supplying water to the nozzles is made in two stages and is equipped with valves 12, 13.

The acoustic nozzle contains a housing 14 with an ultrasonic frequency range sound generator placed in the form of a nozzle 16 and an annular volume resonator 18. The housing 14 is made in the form of a vertically arranged cylindrical sleeve, in the upper part of which there is a tube 20 for supplying air, and is perpendicular to its axis tube 21 for supplying fluid. Inside the housing 14, coaxially with it, a sleeve 27 is rigidly fixed with flanges upper 15 and lower 19, and the lower flange 19 is rigidly fixed in the groove made in the housing 14.

Inside the sleeve 27, coaxially with it, there is a rod with a diameter of d, at the end of which an annular volume resonator 18 is pressed, made in the form of a cup 22 with a conical surface 24. In the rear part of the rod 17 there are fixing discs 25 and 26 made in the form of elastic petals interacting with the inner surface of the sleeve 27. In the lower flange 19 there is at least one nozzle 23 at an angle to the axis of the resonator 18, the value of which lies in the following range of values: 20 ° ÷ 40 °, and the continuation of the axis of the nozzle 23 lies on a circle located located in the middle of the conical surface 24. On the inner surface of the sleeve 27 are made coaxial conical 28 and cylindrical 29 holes.

For optimal operation of the nozzle, the following ratios of its parameters must be observed.

The ratio of the height h _{1 of the} annular cavity resonator 18 to the distance h between the upper base of the conical surface 24 and the lower end surface of the housing 14 lies in the optimal range of values: h ₁ / h = 1 ÷ 3.

The ratio of the inner diameter d _{1 of the} cup 22 of the resonator 18 to the diameter d _{2 of} its outer cylindrical surface lies in the optimal range of values: d ₁ / d ₂ = 0.7 ÷ 0.9.

The ratio of the inner diameter d _{1 of the} cup 22 of the resonator 18 to the diameter d of its rod lies in the optimal range of values: d ₁ / d = 1.25 ÷ 3.

The ratio of the inner diameter d _{1 of the} cup 22 of the resonator 18 to the height h _{1 of the} annular volume resonator 18 lies in the optimal range of values: d ₁ / h ₁ = 1 ÷ 2.

Deaerator works as follows.

Water is supplied to the nozzles of section 9, heating steam from the annular collector 7 also enters here. Due to the ejection effect created by the sprayed water torches, the steam is entrained in the cavity of the torch and quickly heats the water to boiling point. In the area between the partitions 3 of section 4, liquid flows out of the two-phase stream, which collects in the lower part of the column and flows through the nozzles 10 into the storage tank 2, and the gas-vapor mixture is sucked by the nozzles of the section 5 torches, then after separation the gas-vapor mixture of section 5 enters section 6 where the final condensation of the steam takes place, and the gases are released into the atmosphere through the pipe 11.

The acoustic nozzle operates as follows.

A spraying agent, for example air, is supplied through a tube 20, where it encounters an annular volume resonator 18 in its path. As a result of the passage of the resonator 18 by a spraying agent (for example, air), pressure pulsations arise in the latter, creating acoustic vibrations, the frequency of which depends on the parameters of the resonator. The acoustic vibrations of the spraying agent contribute to finer atomization of the liquid supplied through the tube 21 to the nozzles 23, from where it falls onto a circle located in the middle of the conical surface 24 of the resonator 18. It then crushes under the influence of acoustic air vibrations into small droplets, resulting in a torch spray solution with air, the root angle of which is determined by the angle of inclination of the conical surface 24 of the resonator 18.

For repair and maintenance of the column, as well as the replacement of individual nozzles without stopping the entire deaerator, the column can be made of at least two blocks connected in parallel with steam and exhaust gas.

When changing the flow rates of water, steam and the content of deaerated gases, it is necessary to change the flow rate of the vapor after the first stage. A two-stage water supply system with valves 12, 13 allows you to maintain the flow rate of the vapor after the first stage (section 4) at an optimal level. In normal operation, both valves are open. If it is necessary to reduce the flow rate of the vapor, the valve 12 closes and the pressure in the sections 5, 6 drops. If it is necessary to increase this flow rate, valve 13 closes, and the pressure on the nozzles of the last stages will be maximum.

The proposed deaerator has an enlarged surface and contact time, it provides cooling of the vapor, since in each subsequent stage the vapor of the previous one is cooled.

Claims (1)

A deaerator containing a storage tank with a nozzle for suctioning non-condensable gases and a column mounted above it in the form of a water-jet ejector with a water supply device made in the form of nozzles evenly spaced along the cross section and a steam supply manifold made circular and connected to the column by radial jumpers, and in the tank a cone-shaped droplet eliminator is installed at the outlet of the column, the column is divided by vertical partitions into sections connected in series through the gas-vapor path through a separation device, and the column is made of at least two blocks connected in parallel by steam and exhaust gas, characterized in that each of the nozzles is made in the form of acoustic nozzles containing a housing with an acoustic oscillator located inside the nozzle and resonator tubes for supplying air and liquid, and the housing is made in the form of a vertically arranged cylindrical sleeve, in the upper part of which there is a tube for supplying air, and is perpendicular to its axis a cabin for supplying fluid, and inside the housing, coaxially to it, a sleeve with upper and lower flanges is rigidly fixed, while the lower flange is rigidly fixed in the groove made in the housing, and inside the sleeve, coaxially with it, there is a rod of diameter d, at the end of which is pressed an annular volume resonator made in the form of a cup with a conical surface, and fixing disks interacting with the inner surface of the sleeve are located in the rear part of the shaft, and at least one corner nozzle is located in the lower flange ohm to the axis of the resonator, the value of which lies in the following range of values: 20 ÷ 40 °, while the continuation of the axis of the nozzle lies on a circle located in the middle of the conical surface of the resonator, and the ratio of the height h _{1 of the} annular volume resonator to the distance h between the upper base of the conical surface and lower end surface of the housing lies in the optimal range of values: h ₁ / h = 1 ÷ 3; the ratio of the inner diameter d _{1 of the} resonator cup to the diameter d _{2 of} its outer cylindrical surface lies in the optimal range of values: d ₁ / d ₂ = 0.7 ÷ 0.9; the ratio of the inner diameter d _{1 of the} resonator cup to the diameter d of its rod lies in the optimal range of values: d ₁ / d = 1.25 ÷ 3; the ratio of the inner diameter d _{1 of the} resonator cup to the height h _{1 of the} annular volume resonator lies in the optimal range of values: d ₁ / h ₁ = 1 ÷ 2.

Images