Heat exchanger

FIELD: heating systems.

SUBSTANCE: heat exchanger consists of bank of heat exchange coil tubes arranged in the form of platen, the ends of which are fixed in tube sheets; every two adjacent heat exchange coil tubes are attached to each other by means of shaped straps equally spaced as to platen height in staggered order; at that, shaped straps and fasteners have the same material as the tubes.

EFFECT: design with proposed tube bank design will allow obtaining small-sized heat exchanger meeting requirements for reliability, manufacturability, erection at high specific thermal stresses of occupied volume of nuclear power plant.

7 dwg

 

The invention relates to heat-exchange technique and is intended for use as a compact heat exchanger is part of separator-superheater high pressure (SPP) steam-nuclear power plant (NPP)operating on liquid metal coolant in the regime of variable loading.

Known single-threaded tubular coil, mainly for convective camera tube furnace containing a series of straight tubes arranged in a checkerboard pattern, and connected at the ends by bends with bend angle 180°, with an extreme tubes of each row are provided with an additional outlets, the axes of which are located in the plane of the series, and the angle of bend is determined from the corresponding mathematical expressions [1.].

The disadvantage of this technical solution is the deterioration process of heat exchange between the heating and heated fluids by increasing the depth of the layout of the tube bundle due to the increased hydraulic resistance to the flow of the moving fluid and, as a consequence, the reduction of resource of dependable performance of the design, since a large value of temperature difference between inlet and outlet of coolant leads to very significant damage in places of contact of metal pipes and their supporting structures.

Known shell-and-tube heat exchanger, provided the bundle of heat exchange tubes and the intermediate support device in the annular space, made in the form of rings with spacer elements between the pipes, and each support device further comprises a pair of clamping plates with holes for pipes and the ring spacer elements placed between the plates, while the spacer elements made in the form of strips of elastic material [2.].

The disadvantage of this technical solution is the relatively low intensity of heat exchange between the heating and heated fluids in a heat exchanger construction as a whole and, consequently, low values of the output of the steam quality when using it as a modular heat exchanger, for example in the composition of the CAF high-pressure steam-ship NPU.

The technical result of the invention is the provision of maximum compactness of the tube bundle heat exchanger and high efficiency of heat transfer due to the composition of the surface of the heat removal during operation, increasing the resource of reliable operation the design of the heat exchanger at high specific tallapragada occupied volume.

This technical result is achieved in that in a heat exchanger, consisting of a bundle heat exchanger coil of pipe arranged in the form of screens, the ends of which are fixed in the tube plate, cardiidae adjacent heat exchange coil pipe fastened together by means of shaped pads, posted by the height of the screen in a staggered arrangement, and the core plates and fasteners are of the same material as the pipe.

Summary of the invention is illustrated by drawings, where

figure 1 shows a longitudinal section of the heat exchanger;

figure 2 - cross section a-D;

figure 3 is a longitudinal section of the heat exchanger module;

figure 4 shows the beam heat exchange coil pipe;

figure 5 shows the beam heat exchange coil pipe distributing bends;

figure 6 shows the profile of the pads into the incision;

7 shows a plot of beam heat exchange coiled tube profile overlays.

The heat exchanger includes a housing 0 with the lower (upper) cover 1, the nozzle inlet 2 and outlet 3 of a heating fluid, input 4 and output 5 nagaimo liquid (wet steam), all pipes have the camera 6 distribution Teploobmennik liquids with a corresponding lid 7, the tube plate 8, which is connected modular 9 heat exchangers pipes 10 and 11, 12 and 13 by means of pipelines, and 9 modular heat exchangers relative to the body 0 distantierului struts 14. Each unit 9, the heat exchanger has a chamber inlet 15 and outlet 16 of the fluid chamber inlet 17 and outlet 18 of the heated liquid, and the chamber inlet 17 and outlet of the heated liquid are tube sheets 19 and 20 respectively the state, to which is fastened the bundle heat exchanger coil pipe 21, the chamber inlet 15 and outlet 16 have coolant pipe perforated boards 22 and 23, respectively. The bundle heat exchanger coil pipe 21 consists of screens, collected from coiled tubes that are consistently located in the same plane on the straight sections and curved sections divorced in one direction from the plane of arrangement of straight sections, each pipe has an opening in different directions. Straight sections of pipe have profile plates 24 and 25 are connected to each other rigidly by steel tie-rods 26, and the core plates 24 and 25 are separated by the height of the screens in a checkerboard arrangement.

The heat exchanger works as follows.

Heating the coolant enters through the pipe 2 into the chamber 6 of the hand, from pipelines (not shown) enters the pipe 10 module 9 of the heat exchanger, into the chamber 15 of the hand and perforated boards 22 in the annulus of the tube bundle 21. Further, the coolant enters through the perforated Board 23 into the chamber 16, where through the pipe 11 and the pipe goes through the pipe 3. The heated fluid (wet steam) flows through the pipe 4 into the chamber 6 of the hand, from pipelines (not shown) in the pipe 12 9 modular heat exchanger, then into the chamber 17 of the hand with the receipt in the cavity bundle heat exchanger is levikovich pipe 21, in the chamber 18, where through the pipe 13 through pipelines into the chamber 6 and out through the pipe 5. The design of the mount allows you to securely distantsiirovat pipe and prevent chafing of metal pipes.

Performing a heat exchanger construction of the proposed form will allow you to use it as a modular heat exchanger with the most compact tube bundle steam-ship NPP operating on liquid metal coolant in the mode variable loads that meet the requirements of reliability, maintainability, installation at high specific tallapragada occupied volume.

Link

1. Zincalu G.P. and other single-Threaded tubular coil. SU. Patent No. 1386637, C10G 9/20. Priority - 07.01.86. Publ. Bulletin of inventions No. 13. 07.04.1988 - equivalent.

2. Filimonov M.I. shell-and-Tube heat exchanger. SU. A.S. No. 1232924. F28F 9/02.

Priority - 30.12.84. Publ. Bulletin of inventions No. 19. 23.05.1986 prototype.

The heat exchanger consists of a bundle heat exchanger coil of pipe arranged in the form of screens, the ends of which are fixed in the tube plate, wherein every two adjacent heat-exchange coil pipe fastened together by means of shaped plates spaced along the height of the screen in a staggered arrangement, and the core plates and fasteners are of the same material as the pipe.



 

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EFFECT: improved reliability.

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