CS240053B1 - Evaporator and coil tube bundle with centrally located submersible burner - Google Patents

Abstract

Arrangement of the heat exchange surface of an evaporator designed for the evaporation of a cryogenic liquid. The purpose of the solution is to create a tube bundle with a minimum built-up space and with a uniform flow cross-section of the intertube space. The coiled tube bundle (12) is created by winding heat exchange tubes (3) onto a tube (2) of the combustion chamber (1) and the ends of the heat exchange tubes (3) are led into annular collecting collectors (5, 6).

Description

( ⁵⁴ ) Evaporator and wound tube bundle with centrally located submersible burner

Arrangement of the heat exchange surface of an evaporating device intended for evaporating a cryogenic liquid. The purpose of the solution is to create a tube bundle with a minimum built-in space and a uniform flow cross-section of the inter-tube space. The coiled tube bundle (12) is formed by winding the heat exchange tubes (3) onto the tube (2) of the combustion chamber (1) and the ends of the heat exchange tubes (3) are led to the annular collectors (5, 6).

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SUMMARY OF THE INVENTION The present invention provides a heat exchanger surface arrangement of a winding tube bundle evaporator with a centrally located submerged burner for evaporating a cryogenic liquid.

When vaporizing cryogenic fluid flowing in tubes placed in a tube bundle around the immersion burner and its combustion chamber, the tubes must be positioned so that the flow of the two-phase heating mixture (e.g. flue gas - water) is uniform throughout the cross-section.

At present, an evaporator with a single submerged burner is solved either with a submerged burner located outside the tube bundle or with a tube bundle located around the submersible burner in spirals of different designs with collectors. The disadvantage of an evaporator with submerged burner located outside the tube bundle and more built-up space. The disadvantages of current solutions with tubes in coils around a submerged burner are the large difference in length of the individual heat exchange tubes, the uneven flow of the two-phase mixture between the tube space due to the unevenness in cross-section between the tube space and considerable differences between the pressure losses of the tubes. substances in individual tubes.

These disadvantages are overcome by a coiled tube bundle evaporator with a centrally located submerged burner comprising a combustion chamber, manifold and collector, the tube bundle provided with a sealing shirt being formed by winding the heat exchange tubes into layers in helices with the same pitch. The essence of the invention is that

240 053 that the individual layers are wound on the tube of the combustion chamber and in the lower part the individual tubes are led through the shortest path to the annular collector. In the upper part, the heat transfer tubes are led to an annular collector located above the coiled tube bundle. The collector located at the bottom of the coiled tube bundle has a larger diameter than the sealing shirt diameter.

The solution makes it possible to create a tube bundle with a minimum built-up space and a uniform flow cross-section of the inter-tube space, whereby a uniform flow of the steam-liquid mixture through this space is also achieved. The pressure drop of the individual tubes of the coiled tube bundle is approximately the same and thus the same flow of vaporized substance through each tube is ensured.

In the drawing, an exemplary embodiment of an evaporation device with a coiled tube bundle with a centrally located submerged burner according to the invention is shown.

The evaporation device consists of a combustion chamber 2 with a tube 6 onto which the heat transfer tubes forming a coiled tube bundle 12 are provided, provided with a sealing shirt 21 '. In the lower part of the coiled tube bundle 12 the individual heat exchange tubes 3 open into an annular collector. in the upper part of the coiled tube bundle 12, the heat transfer tubes are led to an annular collector 8 connected to the vapor outlet 10 from the evaporator. The vaporized liquid enters the throat device located in the housing of the vaporizer.

From the neck 8, the vaporized liquid is led to the annular collector 5 from where it is distributed to the individual heat transfer tubes 3. After evaporation, it exits from the heat transfer tubes 3 to the annular collector 5 where the vapors are discharged from the evaporation device of the sockets 10. The tube 2 of the combustion chamber 2 opens into a manifold 4, which streamlines the flue gas flow uniformly over the cross-section of the winding bundle 12. The evaporator device cover 4 is provided with cones and droplet separators 14.

Claims (2)

OBJECT OF THE INVENTION A coiled tube bundle evaporator with a centrally located submersible burner comprising a combustion chamber, a manifold and a collector, the tube bundle provided with a sealing shirt being formed by winding the heat exchange tubes into layers in helices of the same pitch, characterized in that the individual the layers of heat exchange tubes (3) are wound on the tube (2) of the combustion chamber (1), wherein in the lower part of the coiled tube bundle (12) the individual heat exchange tubes (3) open into an annular collector (5) and In the bundle (12), the heat exchange tubes (3) are led to an annular collector (6) located above the coiled bundle (12). Evaporator according to claim 1, characterized in that the annular collector (5) located at the bottom of the coiled tube bundle (12) has a larger diameter than the diameter of the sealing shirt (11).