RU53176U1 - MULTISTAGE EVAPORATOR OF INSTANT INSTANTATION - Google Patents

Abstract

The utility model relates to the field of power engineering and can be used in multi-stage flash boilers to obtain demineralized water.

In a multi-stage flash boil-off evaporator containing a housing, a vertical separation wall dividing the evaporator into expansion and condensation chambers, equipped with independent bottoms, the condensation chambers are equipped with a bundle of horizontally arranged heat exchange tubes, guide baffles. The bundles of horizontally located heat exchange tubes are placed relative to the upper and lower bottoms of the condensation chambers (condensers) at a distance equal to 0.025-0.15 of the width of the condenser, each condensation chamber equipped with at least two pipes located under the upper bottoms behind the guide wall, last along the steam.

This design of a multi-stage evaporator of instant boiling will improve its heat transfer characteristics, eliminate tube flooding, and increase productivity.

Description

The utility model relates to the field of power engineering and can be used in flash boilers.

Known evaporators of instant boiling (patent No. 2118972), and No. 31337, consisting of an expansion and condensation chamber.

However, in these designs, heat exchange disturbances associated with the imperfection of aerodynamics of flows due to the lack of guide systems are not excluded.

The evaporator according to patent No. 2259514 is more perfect, however, even in it, with a multi-stage scheme, underflooding of heat-exchange beams is observed, which reduces the efficiency of heat transfer.

The closest in technical essence and achievable result to the claimed technical solution is the design made according to patent No. 2241512, comprising a housing, a vertical dividing wall dividing the evaporator into expansion and condensation chambers equipped with independent bottoms, and the condensation chambers are equipped with a bundle of horizontally arranged heat exchange tubes and guiding partitions.

However, this evaporator, taken as a prototype, has disadvantages.

Due to the lack of systems that exclude tube bundle underflooding, which is observed in multi-stage flash boilers, as well as the corresponding steam spaces in front of the tube bundle in the condensers for uniform distribution of steam, heat transfer deterioration is observed, which reduces the efficiency of the evaporator, and flooded tubes are intensively corroded from the outside.

The inventive utility model is aimed at solving this problem associated with increasing the efficiency of the well-known multi-stage evaporator instant boiling.

This problem is solved in a multi-stage instant boiling-up evaporator, comprising a housing, a vertical separation partition dividing the evaporator into expansion and condensation chambers, equipped with independent bottoms, and condensation chambers equipped with bundles of horizontally arranged heat-exchange tubes, guide walls, so that bundles of horizontally arranged heat-exchange tubes are placed relative to the upper and lower bottoms of the condensation chambers at a distance equal to 0.025-0.15 of the width of the condensation chamber, at ohm each condensation chamber is provided with at least two nozzles arranged at the top head of the last baffle in the course of steam.

The required technical result for increasing the efficiency of the evaporator is achieved by creating the necessary steam channels for the passage of steam between the upper bottom and the tube bundle and the space between the lower bottom and the lower row of tube bundle tubes, eliminating the flooding of the tubes of the lower rows of the tube bundle. Thanks to these solutions, resistance to the incident steam flow is reduced, ventilation of the tube bundle is improved, the available temperature head is increased, and the elimination of tube flooding increases the heat exchange surface, reduces the intensity of corrosion damage to the tubes, and tube tube ventilation is improved.

Experimental studies have found that the distance sufficient to obtain the effect depends on the width of the condensation chamber and is equal to 0.025-0.15 of its width, the larger the width, the smaller the coefficient. For example, with a condensation chamber 1 m wide, the optimum

the distance between the beam and the bottom is 0.08 or 80 mm. With decreasing width of the condensation chamber, the coefficient increases.

Increased heat exchange efficiency allows to reduce underheating, increase its thermal efficiency, productivity.

The novelty of the claimed utility model is confirmed by the presence of optimal features in comparison with the prototype.

The list of drawings.

Figure 1. Instant boiling point evaporator

The multi-stage flash boil-off evaporator consists of a housing 1, a separation partition 2, a condensation chamber 3, an expansion chamber 4, windows 5 made in the separation partition 2, bottoms 6 and 9, cylindrical pipes 8, tubes 7, a pipe 10 for the discharge of evaporated water and a pipe 11 for removal of distillate, pipe 12 for supplying evaporated water, pipe 13 for removing non-condensable gases.

A multi-stage evaporator instant boiling is as follows. Superheated water through the pipe 12 enters the expander 4, where it boils. The generated steam through the window 5 enters the expansion chamber 3, where it condenses on the tubes 7. The distillate from the condensation chamber through the hydraulic locks (not shown in Fig. 1) flows into the next chamber, and is discharged from the last chamber through the pipe 11 to the consumer. Unevaporated water from a higher expansion chamber through cylindrical pipes 8 located on the bottom of the chambers flows into the next lower chamber, where the process is repeated similarly to the first. From the last expansion chamber through the pipe 10, water is discharged from the evaporator.

Using the proposed invention in comparison with the prototype will improve the reliability of the evaporator and increase its productivity.

Claims (1)

A multi-stage flash boil-off evaporator comprising a housing, a vertical separation wall dividing the evaporator into expansion and condensation chambers, equipped with independent bottoms, condensation chambers equipped with a bundle of horizontally arranged heat exchange tubes, guide walls, characterized in that the bundles of horizontally arranged heat exchange tubes are placed relative to the upper and lower the bottoms of the condensation chambers at a distance equal to 0.025-0.15 of the width of the condensation chamber, with each amer condensation is provided with at least two nozzles arranged at the upper bottom of the guide partition, situated downstream of the last pair.