SU122566A1 - Regenerator from evaporative condensation tubes with intermediate heat agent - Google Patents

Description

A distinctive feature of the regenerator described below from evaporative condensation tubes with an intermediate heat agent is as follows.

This regenerator is made of vertical sealed pipes.

The pipes are partially filled with an intermediate coolant and are divided by a partition into two zones. In the lower of them, heat is transferred from the moving hot gas to the boiling heat carrier. In the upper zone, heat is transferred from the condensing coolant to the moving cold gas.

This embodiment of the regenerator provides a simplification of its design and increase the efficiency of its work.

A distinctive feature of the regenerator with another possible form of its implementation is that each of its vertical pipes has an internal insert at the partition level, which consists of a hydraulic valve and a hollow cylindrical sleeve, on the outer surface of which helical grooves are formed. These grooves are intended for the passage of condensed coolant from the second hollow cylindrical sleeve that is hardened inside the sleeve. The latter serves to pass coolant vapors to the upper part of the pipe and to direct these vapors through a series of holes to the inner surface of the pipe wall. This feature provides the intensification of heat transfer processes.

In addition, the regenerator can be divided into several zones in which several coolants are used. This achieves a relaxation of the range of permissible temperature conditions and a reduction in the requirements for heat agents.

No. 122566- - 2 -

FIG. 1 is a schematic diagram of a regenerator; on fng. 2 is a schematic representation of the insertion of its working tube.

The proposed regenerator represents a system of vertical pipes 1 insulated over the coolant, separated by a transverse partition - tube sheet 2 into gas heating zones (lower part) and air cooling (upper parts).

Each pipe is low (as experience has shown, equal to approximately 1/3 of the height of the evaporator section). It is filled with coolant and sealed at the ends. When the lower part of the pipes is washed with gases, the coolant boils here. Formed, heated, and vapor enters the upper part of the pipes, where they condense, giving their heat to the heated air flow. With such a regenerator circuit, the heat exchange process in it is self-regulating. When the temperature of the wash is changed, the gas pipe will automatically change its pressure, and therefore the boiling point of condensation in each pipe will not disturb the circulation of the coolant.

In the proposed regenerator can be applied to any, in the limit equal to the number of transverse rows of pipes, the amount of coolant. Consequently, the regenerator can be divided into several temperature zones, for each of which a coolant is selected, which is most fully satisfied with the temperature conditions of its zone. This sushi, naturally facilitates the selection of the coolant not only by thermal characteristics, but also by boiling temperatures so that in each temperature zone the boiling process of the coolant is dried at low pressures. The latter circumstance allows the use of thin-walled, lightweight pipes in all temperature zones.

At the lowest temperatures B, the tail section of the regenerator as a heat carrier is rational use of water, in zones of medium temperatures (200-300) - organic heat carriers of the type dowterm or diculmethane. For temperatures of 300-500 °, mercury amalgams and low-melting metals can be used.

The metal coolant can work both under conditions of change in the aggregate state, taking into account its high thermal conductivity, and under conditions of natural convection.

The pumpless type of this regenerator design not only simplifies its design, but also allows the use of heat transfer fluids with high melting points, which is essential for a group of metal heat transfer fluids. In the proposed scheme, the solidification of the coolant is not dangerous. When the regenerator is turned on, the solid phase turns into a liquid phase and a closed circulation loop is established in the pipe.

A small amount of coolant in the pipes facilitates the weight of the regenerator, and with the insulin flow along the coolant of each pipe, the requirements for fire safety and non-toxicity of the coolant are significantly simplified.

When filling the coolant, the pipes must be heated to a temperature corresponding to the boiling of the coolant, so that the air is expelled from the tubes. Air removal can also be done by vacuuming. In this case, the danger of oxidizing ability of the heat transfer fluid is eliminated, and the heat transfer process, especially in the condensation part of the pipes, will be the most intensive.

In order to improve the heat exchange process of the heat transfer medium, an installation inside the working tube of the insert can be provided that separates the heat transfer boiling zone from its condensation zone. Vstavka consists of a hollow cylindrical sleeve 3 (Fig. 2) with screw channels on its outer surface, the second sleeve 4 and the hydraulic shutter 5.

The use of the insert allows steam separation, film irrigation (through the channels) by the flowing condenser of the evaporation part of the working tube and jet injection of steam to the condensation surface. These measures significantly intensify the heat exchange process. Intensification of heat transfer from the gas to the wall of the working tube and from the wall to the air is carried out by means of finned tubes. This fins may be made of air flow wires and gas dust plates. In circuits of the closed type, both on the air and gas sides of the heat exchanger, the most intensively working wire finning can be used. Working pipes to the partition (tube plate) can be welded or planted in it on the cone 6.

Subject invention

Claims (3)

1. The regenerator is made of evaporative condensation tubes with an intermediate heat agent, characterized in that, in order to simplify its design and increase its efficiency, the regenerator is made of vertical sealed tubes, partially filled with an intermediate coolant and separated by a partition into the lower zone in which the transfer takes place heat from the moving hot gas to the boiling heat carrier, and the upper zone, in which the heat is transferred from the condensing heat carrier shit. 2. The form of execution of the regenerator according to claim 1, about the fact that, in order to intensify the heat transfer processes, each vertical pipe at the level of the partition has an internal insert consisting of a hydraulic gate and a hollow cylindrical sleeve on the outside surface screw grooves for the passage of the condensed coolant are formed — from a second hollow cylindrical sleeve fixed inside it, which serves to pass the coolant vapor to the upper part of the pipe and to direct these vapors through a row Tille on the inner surface of the pipe wall. 3. The form of the regenerator in PP. 1 and 2, characterized in that, in order to expand the range of permissible temperature conditions and reduce the requirements for heat agents, the regenerator is divided into several zones in which several heat transfer media are used. - 3-№ 122566 Air from compressor