RU1790554C - Thermal deaerator - Google Patents

Abstract

Use: to remove corrosive gases from water. SUMMARY OF THE INVENTION: in a thermal deaerator, comprising in-line 3 and 4 jet traps in the deaeration column housing 1 and bubble trap 5, the last of which is equipped with a vertical steam transfer pipe 8 with a cap 7 covering it with an annular gap, a drain threshold 6 and a vertical with a partition adjacent to the drainage threshold 6 and forming a drainage channel with the housing, a vertical wall 9 is installed on the bubbler plate 5 between the drainage threshold 6 and cap 7 to form a water seal, having a height otu, which is 0.7 ... 0.95 of the height of the pipe section 8 protruding above the plate, while the bubbler plate 5 is perforated in the section between the wall 9 and the drain threshold 6. 1 ill. & 1

Description

The invention relates to a power system, in particular to thermal deaerators, designed to remove corrosive gases from water,

Known thermal deaerator, contains a deaeration column mounted on a deaerator tank and located in the column bubbler device, consisting of a perforated sheet and a steam bypass valve,

A disadvantage of the known design of the deaerator is that it does not work efficiently under varying thermal and hydraulic loads under the conditions of the filling valve of the steam bypass valve. When the load is reduced to a certain value, the valve must be shut off by means of a water seal to prevent steam bypassing in addition to perforation of the bubble sheet. For filling the water seal, special pipes are provided in the structure connecting its pallet to the end section of the bubble sheet. Due to the insufficient flow capacity of these pipes, it is impossible to provide timely shutdown of the steam bypass valve, which leads to disruption of the deaerator. In addition, these pipes are unreliable and low-tech,

A known apparatus design with a cap plate and a drain threshold used in chemical technology.

The known construction is also not effective enough for variables, and especially at low loads of the apparatus under the conditions of operation of the caps and, as a rule, is operated in the base load mode.

: A thermal deaerator is proposed that contains jet and sparger plates installed in the deaeration column casing, the last of which is equipped with a vertical steam bypass pipe with a cap covering it with an annular gap, a drain threshold and a vertical partition adjacent to the drain threshold and forming a spillway channel. In this case, the thermal deaerator is provided with a vertical wall mounted on a bubbler plate between the drain threshold and the cap with the formation of a water seal and having a height of 0.7 ... 0.95 from the height of the pipe section protruding above the plate, while the bubbler plate is made perforated in the area between the wall and the drain threshold.

The introduction of deaerators of the proposed design in the industry will ensure

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Significant economic effect due to increased reliability and efficiency of their work and manufacturability.

Currently, a series of such deaerators with a productivity of 5-100 t / h has been developed for operation, mainly in industrial and industrial heating boilers.

The drawing shows a General view of the proposed thermal deaerator in section.

The thermal deaerator contains a deaeration column 1 mounted on the deaerator tank 2. In the deaeration column there are jet plates 3 and A and a bubble perforated plate 5. The latter is equipped with a drain threshold b, a steam bypass cap valve, consisting of a cap 7 and a pipe 8, and a pipe 8 9, forming with a portion of the nozzle 8 of the nozzle 8 protruding above the plate. Moreover

B.per. (0.7-0.95) Patr,

where is hnep. - height of the partition;

Npatr. the height of the portion of the cap valve nozzle protruding above the plate;

The necessary height of the partition, taking into account the height of the liquid layer above it (Ah), is determined by the relations

hnep. hnarp. - Ah Lpatr. (1-r .--

-),

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Ah 3 V

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i is the fluid flow rate on the plate, m3 / m.h.

In practice, in thermal deaerators, depending on the size, the value of i is in the range of 10-150 m3 / mh, and hnarp. 200-300 mm. Substituting the indicated limit values into the formulas, we obtain

hnep. (0.58-0.95) hnaTP,

In order to avoid disruption of the hydraulic lock with a minimum deaerator capacity (30% of the nominal), we accept

hnep. (0.7-0.95) bpatr.

The deaerator is equipped with partitions 10, 11 and fittings for supplying the source water 12 and heating steam 13, for discharging the deaerated water 14 and the vapor 15.

Deaerator works as follows. The source water through the nozzle 12 is fed to the upper plate 1, with which it is drained by jets onto the bubbler plate 5. Then, the water passes through the bubbler plate in the layer provided by the drain threshold 6, and through the drain channel and the water seal formed by the partitions

10 and 11, it enters the lower plate 4. With the last, water flows downstream into the tank 2, after which it is discharged from the deaerator through the nozzle 14. Steam through the nozzle 13 is supplied to the tank 2, ventilates its vapor volume and enters the column under the bubbler plate 5. Passing through the openings of the bubbler plate, the degree of perforation of which is selected so that with a minimum heat load of the deaerator, a water dip is eliminated through them, steam exposes the water on the plate to intensive processing. With increasing

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part of the steam is discharged into the jet compartment through the cap valve and a water seal formed by the nozzle 8 and the wall 9. In the jets, water is heated to a temperature close to the saturation temperature, the bulk of the gases are removed and most of the vapor is condensed. On a bubbler plate, water is heated to saturation temperature and to remove the trace amount of gases. The mixture (vapor) remaining from the gas-vapor mixture is discharged from the deaerator through the nozzle 15.

claims

Thermal deaerator containing jet and bubbler plates installed in the deaeration column casing, the last of which is equipped with a vertical steam bypass pipe with a cap covering it with an annular gap, a drain threshold and a vertical baffle adjacent to the drain threshold and forming a drain with different

in order to increase the reliability and efficiency of work in a wide range of thermal and hydraulic loads, it is equipped with a vertical wall mounted on a bubble plate between the drain threshold and the cap with the formation of a water seal and having a height of 0.7 ... 0, 95 of the height of the pipe section protruding above the plate, while the bubbler plate is perforated in the section between the wall and the drain threshold.