RU187793U1 - Dual flow cross-precision recuperator - Google Patents

Abstract

The utility model relates to the field of heat power engineering, namely to recuperators in which secondary thermal energy is used. The double-flow cross-precision recuperator contains an inlet manifold 1 with nozzles for supplying air, an outlet manifold 4 and heat exchange tubes 5 and 6. The inlet and outlet manifolds 1 and 4 are located one above the other, the recuperator is additionally equipped with intermediate collectors 2 and 3, the cavities of which are communicated. Heat exchanging pipes 5 and 6 of the inlet manifold and outlet manifold are connected to the intermediate manifolds 2 and 3 and form tube sheets. The nozzles 8 and 9 for air supply are located on one side of the inlet manifold 1 and spaced along its edges, while in the middle of each collector 1,2,3,4 installed partitions 10,11,12,13. Heat transfer tubes 5.6 can be made of high-temperature refractory solid cast ceramics. The technical result is high efficiency, as well as reducing energy intensity due to the exclusion of dynamic resistance and uniform distribution of the input stream to the collectors. 1 s.p. f-ly, 2 ill.

Description

The utility model relates to the field of power engineering, namely, to recuperators in which secondary thermal energy is used.

Known recuperator for heating the primary air of an open low oxidation heating furnace, consisting of U-shaped pipes containing inlet and outlet branches installed under the intermediate hearth of the furnace at the end of the preheating chamber and located in the opposite direction to each other, characterized in that the recuperator contains an even number of U-shaped pipes, with each pair of pipes adjacent to each other extending to one side of the furnace connected in series with each other by an external pat assembly with flanges at the ends (patent for the invention of the Russian Federation No. 2343387, publ. 10.01.2009).

The following technical solutions are also known: A.S.SSSR No. 919461, A.S.SSSR No. 713614, A.S.SSSR No. 954787, RU 2138737,

 RU 23558217, RU 217872, RU 28538, etc.

As a result of patent research, technical solutions in this technical field that were considered by the applicant were also identified, namely: CA 1155834, AU 199805504, US 20160025413, JP 2000126646.

The closest technical solution, according to the general set of features selected by the applicant as a prototype, is a recuperator, which contains heat exchange pipes fixed at one end in the inlet manifold, the other in the outlet, and swirlers are installed at the inlet to the heat exchange pipes. The input manifold is divided into two chambers, each of which has a pipe for supplying air, swirls are located in one of the chambers, and the second cavity is connected to the inner cavity of the swirlers by cylindrical pipes. Installing a swirler in one of the chambers allows you to adjust the intensity of the swirling air flow in the pipes and thereby change the heat transfer coefficient (patent for invention RU No. 2125207, publ. 01.20.1999).

With the known air flow rate in the prototype recuperator, the time required for sufficient air heating can be increased by increasing the length of the recuperator and / or creating turbulent flows in the ducts to enhance heat exchange with the hot external environment. The disadvantage of this device is the design complexity, because to increase the length of the recuperator is not possible due to the fact that this will lead to significant mass overall dimensions. Turbulence of flows requires additional energy, and to ensure turbulent flows, design complexity is required - it is necessary to install a control device, the end caps of the swirls and partitions must be installed so that their openings are aligned with the axis of the heat exchange tubes. The presence of swirlers in the recuperator requires an increased energy expenditure necessary to stimulate flow energy. Therefore, the known device for ensuring high efficiency requires increased material and labor costs, including their production and subsequent maintenance.

The technical task of the claimed utility model is the creation of an effective compact two-flow recuperator, which provides ease of assembly and maintenance, reducing energy consumption.

The technical problem is achieved in that the inventive two-line cross-precision heat exchanger contains an inlet manifold with nozzles for supplying air, an outlet manifold and heat exchange pipes, characterized in that the inlet and outlet manifolds are located one above the other, the recuperator is additionally equipped with intermediate manifolds, the cavities of which are communicated, heat exchanging pipes of the inlet manifold and the outlet manifold are inserted into the intermediate manifolds and form tube sheets, and the nozzles for air supply are placed wife one side inlet manifold and spaced along its edges, wherein a middle portion of each collector installed partition.

Heat transfer pipes can be made of high-temperature refractory solid cast ceramics.

Comparison of the claimed utility model with the prototype shows that it differs in the following features:

- input and output collectors are located one above the other;

- the recuperator is additionally equipped with intermediate collectors;

- cavities of intermediate collectors communicated;

- heat transfer pipes of the inlet manifold and outlet manifold are inserted into the intermediate manifolds and form tube sheets;

- nozzles for air supply are located on one side of the inlet manifold and spaced along its edges;

- a partition is installed in the middle of each collector.

Therefore, we can assume that the claimed utility model meets the criterion of "novelty."

The cross-flow double-flow recuperator eliminates the mixing of gaseous media involved in the heat exchange used to heat, for example, blast air.

Heat transfer pipes are made of high-temperature refractory solid cast ceramics, which allows to obtain an additional technical result.

The utility model can be manufactured on standard equipment, so it meets the criterion of "industrial applicability".

Figure 1 schematically (top view) shows an example of the inventive recuperator with two intermediate collectors, Figure 2 is also a side view.

The recuperator is located at the bottom of the afterburner (not shown in the diagrams). The recuperator comprises an input collector 1 and an output collector 4 located one above the other. Heat transfer pipes 5 form the upper tube sheet (register). The recuperator is additionally equipped with an upper intermediate collector 2 and a lower intermediate collector 3, the cavities of which are communicated. The heat exchange tubes 5 from the inlet manifold 1 are led into the upper intermediate manifold 2, and the lower intermediate manifold 3 is connected by the heat exchange tubes 6 to the output manifold 4. The heat exchange tubes 6 form the lower tube sheet. The inlet manifold 1 has nozzles 8 and 9 for supplying air, which are located on one side and spaced at the edges. For the formation of two independent flows of blast air in the middle part of each collector, partitions 10, 11, 12, 13, Pos. 7 marked blow fans.

The heat transfer pipes 5.6 are made of high-temperature refractory solid cast ceramics, the use of which is due to the thermal and chemical resistance of the material to aggressive hot environments, the absence of temperature deformation, as well as the maximum thermal conductivity for heat exchange between the media (blown oxygen and exhaust gases), The metal parts of the heat exchanger are protected from high temperature corrosion with special refractory materials.

The claimed utility model of the recuperator works as follows.

The recuperator is located at the bottom of the afterburner (not shown in the figure). The blower fans 7 supply air through the nozzles 8, 9 to the inlet manifold 1. A design feature is that the air enters the manifold 1 from opposite sides, the movement of oncoming air flows in the manifold 1 is limited by the transverse partition 10, so the air is aerodynamically distributed through the heat exchange tubes 5 forming two streams. Then the air flows into the upper intermediate manifold 2. Since the cavity of the upper intermediate manifold 2 communicates with the cavity of the lower intermediate manifold 3, the injected air passes into the heat exchange tubes 6, also in the form of two flows, which is provided by partitions 12,13, and then enters the corresponding parts of the outlet manifold 4 are formed by a baffle 11. Hot gases in the afterburner flow around the heat transfer pipes from all sides, because they form tube sheets. It should be noted that the formation of two flows in the recuperator allows more even distribution of air between the heat exchange pipes, and the presence of partitions eliminates the possibility of the formation of oncoming flows, which, in turn, reduces energy consumption, uses less powerful fans with dynamic pressure, allows to reduce the profile flow rates heated air, which contributes to a more intensive heat transfer, as well as to ensure redundancy of the device in case of exit failure of one fan. Passing between the heat exchange pipes along a certain trajectory, hot gases uniformly heat them over the entire surface area, which contributes to a more efficient heat transfer, then they enter the soot chamber and then into the chimney (not shown in the drawing). The heated ceramic heat transfer tubes 5 and 6 in turn transfer thermal energy to the blast air passing through them. Flows of blast air heated to the required temperature after the outlet manifold are used in the further process.

The inventive recuperator can be made with three, four and a large number of intermediate manifolds. The number of intermediate collectors is determined depending on the temperature needs of a particular process and on the power of the fans used.

Industrial tests of this two-flow cross-flow heat exchanger with the claimed layout, showed its high efficiency, as well as reducing energy consumption by eliminating dynamic resistance and uniform distribution of the input stream to the collectors. During production tests of the inventive recuperator confirmed the possibility of increasing efficiency by increasing the number of registers.

Claims (2)

1. Two-flow cross-precision recuperator having an inlet manifold with air inlets, an outlet manifold and heat exchange pipes, characterized in that the inlet and outlet manifolds are located one above the other, the recuperator is additionally equipped with intermediate collectors, the cavities of which are communicated, heat exchangers of the inlet manifold and the output manifold are introduced into the intermediate manifolds and form tube sheets, and the nozzles for air supply are located on one side of the inlet manifold and different senna on its edges, while the middle part of each collector installed partition. 2. Double-flow cross-precision recuperator according to claim 1, characterized in that the heat transfer pipes are made of high-temperature refractory solid cast ceramics.

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