Direct-flow heat exchange device

FIELD: heating.

SUBSTANCE: invention refers to heating engineering and can be applied in devices for interaction of two heat carriers without direct carrier contact, particularly in steam generators. Direct-flow heat exchange device includes case and concentric tube channels formed by a cylinder made out of straight heat exchange elements of pipe-in-pipe type, where a gap between outer surface and case of obtained cylinder forms heating medium channel connected in sequence with inner cavity of the cylinder and with inner channel of pipe-in-pipe elements comprising the cylinder. Work medium flows in the annular channel of pipe-in-pipe element.

EFFECT: enhanced spatial power density of heat exchanger, simplified design.

3 dwg

 

The technical field to which the invention relates

The invention relates to a device for implementing the interaction between the two fluids without direct contact and can be used in heat engineering, in particular in steam generators.

The level of technology

Known once-through heat exchangers, which contain concentric tube channels tube type of field's (Fraas A., Ozisik M. Calculation and design of heat exchangers. - M.: Atomizdat, 1971. - 361 p. - P. 275 - 276; Egorov K. S. improving the efficiency of heat exchangers of gas turbine units closed cycle: the dissertation on competition. academic step. Ph. D. Moscow: Bauman. N. Uh.Bauman, 2007. - 17 p.; EN 2307373 C1, 10.02.2006). In these devices the first stream of coolant flows through the inner pipe, turns into a dead end and flows further through the annular ring space. The flow of the second fluid flows around the outer surface of the annulus.

Disadvantages of these devices: the presence of an additional cylindrical tube and the parasitic heat flow through them reduces the volumetric power density, which is equal to the power provided to the unit volume of the device.

Known single pass parallel flow heat exchanger, containing a concentric tubular channels of the type "pipe in pipe", in which the heating �Reda served simultaneously in the annulus and in the inner cavity of the pipe and heats the working environment, which flows in counter-current in the annular cavity of tubular channels (RU 2140608 C1, 13.04.1998).

The disadvantage of this device is the low volumetric energy densities due to the low degree of obtaining energy from the heating medium.

Closest to the proposed solution is a two-way direct-flow heat exchanger, comprising a housing and a concentric tubular channels of the type "pipe in pipe". During the second coolant channels are formed by cylinders made of the heat exchange elements attached to each other side surfaces, which are direct pipe, and the inside of the pipe is moving working environment, and along the surface of the cylinder - the heating medium (RU 2121622 C1, 10.11.1998).

The disadvantages of this device is not sufficiently high energy densities due to the low degree of obtaining thermal energy from the heating medium and the large volume of elements connecting the flows of coolants, as well as the high complexity of the design.

Disclosure of the invention

The object of the invention is to increase the volumetric energonapryazhennosti heat exchanger and simplification of its design.

The task is solved in that, unlike the known solutions, is implementing a three-way heat transfer without substantially increasing device comprising concentric tubular channels t-type�UBA in the pipe". This is achieved by organizing the flow of heating media in the channels formed by the cylinder is made of heat-transfer elements adjacent to each other side surfaces, whereby these elements are the direct elements of type "pipe in pipe", the gap between the cylinder and the housing, and an internal cavity elements "pipe in pipe". The working fluid is moving in a single-pass mode in the annular channels of the elements of "pipe in pipe". The heating medium is gradually moving inside the cylinder, then in the gap between the cylinder and the casing, then inside ring channels "pipe in pipe".

Description of the drawings

Fig.1 shows a cross-section of the device.

The implementation of the invention

The device includes a housing 1, a cylinder 2 formed of heat-exchange elements of "pipe in pipe", channels 3, 4 and 5, formed internal cavity of the cylinder, the clearance between the cylinder and the housing, and an internal cavity elements "pipe in pipe", forming a cylinder, and an annular channel 6.

Adding the third passage of the heating medium along the heat transfer surface with almost the same size, equivalent to an increase of the heat transfer surface by 1.5 times and the same increase of energonapryazhennosti heat exchanger. In the apparatus implemented additional connection channels of heating media that simplify�t design and increases its compactness.

The device operates as follows.

The unit served in the counter-flow through the inlet nozzles, manifolds and tube sheets: working medium in the annular channel 6 and the heating medium into the channel 3. The heating medium sequentially passes through the channels 3, 4 and 5, giving heat to the working medium, which moves along the annular gap 6. Then, the working and the heating medium discharged through the corresponding nozzles. The heat exchanger can be implemented with three or more elements of "pipe in pipe".

The device is implemented by LLC "Bagan" (Novosibirsk) in the small-sized cylindrical steam generator 2 MW weight of 300 kg (1 and 2), which corresponds to energonapryazhennosti above the 6.6 kW/m3. This is 1.6 times higher than the maximum power density achieved to date in small-sized steam boiler MCPUK development JIHT RAS (K. A. Yakimovich gas Turbine power plant for power utility // Electronic journal energy service company "Ecological systems", №2, 2008, Available at: http://esco-ecosys.narod.ru/2008_2/art73.htm, (25.09.12)).

A parallel flow heat exchanger, comprising a housing and a concentric tubular channels of the type "pipe in pipe" formed of a cylinder made of a heat-transfer elements adjacent to each other side surfaces, wherein the�, that make up the cylinder heat-exchange elements of the heat exchange elements are of type "pipe in pipe", and between the outer surface and the housing created by the cylinder there is a gap that forms the channel of the heating of the environment is connected in series with an internal cavity of the cylinder and an inner channel elements "pipe in pipe", forming a cylinder.



 

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EFFECT: improved reliability.

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