RU51437U1 - STEAM GENERATOR FOR INTEGRAL REACTOR - Google Patents

Abstract

The proposed utility model relates to the field of power engineering and can be used in installations with integrated reactors in those cases where it is necessary to have a stable natural circulation of the working medium, especially in conditions of cooling, and also to have minimum cutouts in the integrated reactor casing for installing supply and exhaust chambers coolant of the second circuit. The steam generator for the integrated reactor is a vertical recuperative heat exchanger of the submersible type consisting of four identical modules, autonomous along the contour of the working medium. Steam generator modules are placed along the perimeter of the integrated reactor between the integrated reactor vessel and the core. The modular design of the steam generator allows, in the event of an inter-circuit leak, to shut off only part of its heat exchange surface, and not the entire steam generator. Each steam generator module consists of two water chambers, one steam chamber, inlet and outlet heat transfer pipes of the secondary coolant, and heat exchange surface coils. The inlet and outlet heat exchanger tubes of the coolant of the second circuit combine seven coils of the heat exchange surface into one and then are output to the water inlet and steam outlet chambers. The places of passage of the inlet and outlet pipes of the coolant of the second circuit through the reactor vessel are protected by perforated disks with collars. The collars are used to mount the disks to the body of the integrated reactor. The technical result of the proposed utility model is an increase in the level of natural circulation, as well as a maximum limitation of the live section for the output of the inlet and outlet heat transfer tubes outside the integrated reactor vessel.

Description

The proposed utility model relates to the field of power engineering and can be used in installations with integrated nuclear reactors in those cases where it is necessary to have a stable natural circulation of the working medium, especially in conditions of cooling, as well as to have a minimum size of cutouts in the body of the integrated reactor for installing supply chambers and removal of the coolant of the second circuit.

Known steam generator for integrated nuclear reactors (patent RU 2153709, publication date 07/27/2000), containing a heat exchange surface made of pipes grouped into modules that are located between the integrated reactor casing and the active zone, the nodes of the supply and removal of the secondary coolant, located on the side surface of the shell of the integrated reactor, inlet and outlet pipes - adopted as a prototype.

The disadvantage of this steam generator is that the nodes of the inlet and outlet of the coolant of the second circuit require large cutouts in the integrated reactor casing to install them, and with significant alternating loads in the nodes of the supply and removal of the coolant of the second circuit and the integrated reactor casing, these nodes can be destroyed in as a result, the primary coolant will be ejected with a large cross section equal to the size of the hole made in the integrated reactor casing for installing the supply units and twater second coolant circuit, in addition to the level of a natural circulation steam generator having the same size, height, and lifting of sunk portions of heat exchange coils during cooldown of the reactor will have a low value.

The objective of the utility model is to increase the reliability of the steam generator.

The technical result of the proposed utility model is to increase the level of natural circulation, as well as the maximum restriction of the live section for the output of the inlet and outlet heat transfer pipes outside the reactor vessel.

This result is achieved in that the steam generator for the integrated reactor, comprising a heat exchange surface made of coils, grouped into modules located between the integrated reactor casing and the core, the inlet and outlet of the secondary coolant located on the side surface of the integrated reactor casing, supply and exhaust heat transfer pipes, while the heat transfer surface is made of coils

J-shaped, grouped into modules, and the output nodes of the inlet and outlet heat transfer pipes are made in the form of water supply and steam outlet chambers and are protected by perforated disks with collars, while the collars are mounted on the integral reactor casing.

The essence of the proposed utility model is illustrated in the drawing, where:

figure 1 shows a longitudinal section of a steam generator for integrated reactors;

figure 2 shows a General view of the heat exchange surface;

figure 3 is a horizontal section of a steam generator for integrated reactors;

figure 4 shows a view of the inlet and outlet heat transfer pipes.

The steam generator for the integrated reactor is made of coils 1 of the heat exchange surface, grouped into modules 2.

The steam generator is made of four identical modules 2, autonomous along the contour of the working environment. The steam generator modules 2 are placed along the perimeter of the integrated reactor between the integrated reactor casing 3 and the core 4. The modular design of the steam generator allows, in case of an inter-circuit leak, to shut off only part of its heat exchange surface, and not the entire steam generator. Each module 2 of the steam generator is made of two water inlet chambers 5 and one steam outlet 6, supply heat exchange tubes 7 and exhaust heat transfer tubes 8 of the secondary coolant and the heat exchange surface coils 1.

The inlet heat transfer pipes 7 and the outlet heat transfer pipes 8 of the second coolant are combined, each having seven coils 1 of the heat exchange surface, which are subsequently discharged into the water chambers 5 and the steam chambers 6. This circumstance makes it possible to reduce the size of the water inlet chambers 5 and the steam chambers 6 in the casing 3 integral reactor. The water inlet chambers 5 and the steam outlet chambers 6 at the points of connection to the integral reactor casing 3 are protected by perforated disks 9, which are fastened to the integral casing 3 by means of collars 10.

The need for a J-shaped coil 1 of the heat exchange surface is due to the requirement of a stable natural circulation of the working medium in cooling conditions. The specified shape of the coils 1 of the thermal surface, grouped into modules 2 of the steam generator also allows you to place four circulation pumps of the primary coolant in the openings between the modules of the steam generator (not shown in the figures). In order to reduce the temperature difference in the chambers of the inlet of water 5 and the outlet of the steam 6 of the steam generator, as well as to protect the integral reactor from loss of coolant in case of loss of tightness of the weld points of the chambers of the inlet of water 5 and the exit of steam 6, perforated tubes are installed in the housing 3 of the integrated reactor

disks 9. In the holes of the perforated disks 9 are inlet heat transfer pipes 7 and outlet heat transfer pipes 8 of the secondary coolant.

In case of loss of tightness of the water inlet chambers 5 and the steam outlet chambers 6, the coolant does not flow out over the full section of the chamber, but through the gaps between the holes in the perforated disk 9 and the inlet heat transfer tubes 7 and the outlet heat transfer tubes 8 of the secondary coolant.

A steam generator for an integrated reactor operates as follows:

The coolant after the active zone 4 of the integrated reactor is pumped into the ascending branch of the outlet heat transfer tubes 8, limited by the covers (not shown in the figures), then it is turned through 180 ° in the lower part of the coils 1 of the heat transfer surface and is fed into the active branch along the downstream branch of the heat transfer tubes 7 zone 4.

In the second circuit, water is supplied to the water inlet chambers 5, it is lowered downstream of the heat exchanger tubes 7 of the coils 1 of the heat exchange surface, and a countercurrent of the media of the first and second circuits is provided, then the steam-water mixture enters the ascending section of the outlet heat exchangers 8 of the coils 8 of the coils 1 of the heat exchange surface and the generated steam from the steam outlet chamber 6 is supplied to the consumer.

Claims (1)

A steam generator for an integrated reactor, comprising a heat exchange surface made of coils grouped into modules located between the integrated reactor casing and the active zone, supply and removal nodes of the secondary coolant, located on the side surface of the integrated reactor casing, supply and exhaust heat exchange pipes, characterized in that the heat exchange surface is made of J-shaped coils grouped into modules, and the output nodes of the supply and exhaust heat transfer pipes b formed as the water inlet and steam outlet chambers and secured perforated disk with collar, the clamps are fixed to the reactor vessel.