RU2391614C1 - Counter-flow laminar matrix-circular ceramic recuperator - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: air-gas counter-flow laminar matrix-circular compact ceramic recuperator consists of row of cylinder heat exchanging matrixes of various diametre arranged coaxially one in another. Also each matrix is made as a cylinder cartridge assembled as a pile of flat circular leaves-plates with holes and cross slits with specified circular step; the plates are designed for separate motion of air flows in them and for exhaust of hot gas. Notably, these air and gas flows never mix at their motion in space along spiral stepped cylinder channels and along short cross channels.

EFFECT: improved characteristics of common laminar recuperators used in gas-turbine installations of open cycle.

5 dwg

Description

The invention relates to power engineering, in particular to gas turbine, which creates highly economical gas turbine engines and installations with heat recovery. One of the important elements of such engines and plants is a recuperator, in which the heat of the exhaust gases is transferred to the compressed cyclic air.

It should be noted that one of the significant drawbacks of modern tubular and plate heat exchangers is their bulkiness and, as a result, significant dimensions and mass, significantly exceeding the similar characteristics of all other elements of a gas turbine unit combined.

Known plate heat exchanger adopted as the closest analogue of the present invention [1, p.357].

The aim of the present invention is to significantly improve the technical improvement of the plate heat exchanger. The proposed recuperator is promising for its use in open-cycle gas turbine units, which is convincingly confirmed by the calculations performed here.

In the present invention, the above goal is achieved specifically by the fact that:

- the recuperator is designed in the form of a series of cylindrical, identical in design, heat transfer matrices of the same width and different outer diameters. In this case, the matrices are mounted coaxially, one in the other;

- matrices are made in the form of cylindrical glasses. The required number of such glasses easily varies depending on the required heat exchange surface of the recuperator. This is achieved by a corresponding increase in its outer diameter at a constant height of the recuperator;

- each matrix in a structural aspect is a cylindrical glass assembled in the form of a stack of flat annular sheets tightly compressed among themselves - plates with holes and transverse slots, the latter being made with a constant circumferential step;

- holes and slots are intended for separate movement of air and exhaust hot gas flows in them, and these air and gas flows are not mixed anywhere when they move in space along spiral-shaped stepped cylindrical channels and along short transverse channels.

The invention is illustrated by the schematic drawings shown in figures 1-5.

Figure 1 shows in plan a layout diagram of cylindrical heat transfer matrices of different diameters, mounted coaxially in one another. It can be seen that in terms of each heat transfer matrix is a ring of a certain inner diameter and constant for all matrix widths. Each such ring has a certain number of central holes 1 and peripheral half-openings 2. The openings are cross-sections of channels along which flows of cold compressed air move, and half-openings are cross-sections through which hot gas flows. Figure 2 presents a longitudinal section of the recuperator and shows the direction of movement (arrows) of the coolant. Figure 3 shows a cross section aa of the recuperator. Finally, FIGS. 4 and 5 show a stack of matrix ring elements and a matrix ring element, respectively.

The basis of the air-gas counterflow plate matrix-ring small-sized ceramic recuperator (hereinafter referred to as briefly - recuperator) are cylindrical heat transfer matrices. A stack of one of these matrices is shown in Fig. 4, and one of the elements of the matrix ring is shown in Fig. 5.

Returning to FIG. 1, it can be seen that the structure of the recuperator in the particular embodiment under consideration has five cylindrical heat transfer matrices, including central 3 and peripheral 4 matrices.

Figure 2 presents a diagram of the supply of cold air 5, the removal of heated air in the recuperator 6, the supply of hot gases 7 and the removal of cooled gases 8.

The recuperator in question works as follows. Compressed cyclic air is supplied to the recuperator according to arrows 5 (Fig. 2), changing the direction of movement to the opposite, is supplied to all openings 1 (Fig. 5). Hot gases are supplied to the center of the recuperator in the direction of arrows 7 (Fig. 2) and sent to the system of docked half-openings 2 (Fig. 5), through which they go through the entire height of the recuperator and are discharged from the heat exchanger in the direction of arrow 8 (Fig. 2).

The release of compressed air heated in the recuperator is carried out according to arrows 6. The material of the recuperator can be structural ceramics and metals.

Claims (1)

An air-gas countercurrent plate-type matrix-ring small-sized ceramic recuperator, characterized in that it consists of a series of cylindrical heat-exchange matrices of different diameters installed coaxially one into the other, each matrix being made in the form of a cylindrical glass assembled in the form of a stack of flat ring sheet-plates with holes and transverse slots having a certain circumferential pitch, and designed for separate movement of air and exhaust hot gas flows therein, and and the air and gas flows are never mixed, as they move in space along a spiral stepped cylindrical channels and short transverse channels.

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