RU172896U1 - Lamellar-Ribbed Gas-Oil Heat Exchanger - Google Patents

Abstract

The utility model relates to the field of mechanical engineering and heat engineering, namely, to designs of heat exchangers with a plate-fin package, and can be used in gas-turbine installations of gas-pumping units. in a multilayer package, alternating lamellar channels for oil, for gas and the buffer channels separating them. All channels contain load-bearing walls, corrugated nozzles, like ribbing channels, and bars that are located on two opposite edges of the plate channels, parallel to each other, and between them parallel corrugated nozzles are installed with the possibility of the direction of fluid flow. The corrugated nozzles of the buffer channels are perpendicular to the corrugated nozzles of the gas channels and oil channels, and two opposite edges of the buffer channel are open to the atmosphere. The oil channels and gas channels contain, at two opposite cross angles, buffer cavities bordering the inlet and outlet distributors, limited by bars and having an outlet along the corrugated nozzles into the atmosphere. Each pipe for oil and gas supply is installed in the corresponding distributing collector of the heat exchanger obliquely, at an angle of less than 180 degrees to the vertical axis of symmetry of the heat exchanger.

Description

The utility model relates to the field of mechanical engineering and heat engineering, namely to the designs of heat exchangers with a plate-rib package, and can find application in gas turbine installations of gas pumping units.

When operating heat exchangers, for example, in gas pumping units, safety of work and the efficiency of heat transfer in such a heat exchanger are of paramount importance. The solution to the problem of increasing heat transfer efficiency is important at all stages of heat transfer, including at the stage of receipt of the coolant from the inlet pipes to the distributing heat exchanger collectors, before the distribution of the coolant over the heat transfer surface areas. A number of technical solutions are known that are used to ensure uniform distribution of the supplied coolants already before entering the heat exchanger channels.

Known technical solution according to patent RU 1760844 "Distributing chamber of the heat exchanger", IPC F28F 9/02, publ. 10/27/2015, in which the distributing chamber of the heat exchanger contains an axial nozzle for supplying the heat transfer medium, a casing and a cover mounted on the casing with a gap relative to the end of the axial pipe, while the gap between the end of the axial pipe and the inner surface of the cover is made variable around the perimeter of the pipe. During the operation of the heat exchanger by ensuring a given pattern of distribution of the coolant, intensification of heat transfer is achieved. However, performing a gap around the circumference of the nozzle complicates the design of the heat exchanger.

Known inlet chamber of the heat exchanger according to patent SU 1720371 "Inlet chamber of the heat exchanger", IPC F28F 9/00, publ. 03/20/2005, where the inlet chamber contains a housing with nozzles and an annular corrugated screen, the corrugations of which are located at an angle to the paths of the passage of coolant in the heat exchanger. In embodiments, the corrugations can be perpendicular or arranged along a helical line, and the screen itself can be formed by a set of coaxial screens mounted relative to each other with a gap, or in the form of a truncated cone. The inlet nozzles are installed tangentially to the housing. During the operation of the heat exchanger, the design of the chamber improves mixing of media with different temperatures.

A disadvantage of the known technical solution is the use of an additional corrugated screen in the heat exchanger as an integral structural part, which increases the metal consumption, complicates the design, does not affect the safety of the heat exchanger.

In terms of ensuring the safety of the operation of the heat exchanger, the closest in technical essence to the proposed technical solution is “The method of safe heating of fuel gas and a gas-oil heat exchanger for its implementation”, RF patent No. 2312241, IPC F02C 7/08, F28D 9/00, publication date 10.12. 2007, in which the gas-oil heat exchanger has lamellar channels for oil and for gas, contains lamellar buffer channels, all channels being combined into a multilayer package with distributing and collecting manifolds adjacent to it. Buffer channels are located between alternating channels for oil and channels for gas, separating them. All channels contain load-bearing walls, corrugated nozzles and bars, the last of which are located on two opposite edges, parallel to each other, and corrugated nozzles are installed between them, while the buffer channel nozzles are perpendicular to the gas channel and oil channel nozzles, and two opposite edges buffer channels open to the atmosphere. The oil channels and gas channels contain, at two opposite cross angles, buffer cavities bordering the inlet and outlet distributors, limited by bars and having an outlet along the corrugated nozzles into the atmosphere. This design of the channels solves the most important task of ensuring the safe operation of the heat exchanger. However, a significant drawback of this technical solution is that in the proposed design, the gas supplied for heat exchange flows from the inlet pipe to the gas distribution manifold vertically at a speed of several tens of meters per second and, accordingly, is unevenly distributed over the heat exchange channels, and the supplied coolant - oil comes from the inlet the nozzle into the distributing oil manifold is vertically with a pressure and is also unevenly distributed over the heat exchange channels, in connection with which the wetting is reduced vaemost surfaces of heat transfer plates, the heat exchange efficiency is reduced.

The objective of the proposed technical solution is to improve the uniformity of the distribution of the coolant flow at the inlet to the distributing collector, without complicating the design of the inlet pipes and distributing collectors of the heat exchanger.

The problem is solved in a plate-fin gas-oil heat exchanger with distributing and collecting manifolds with nozzles for oil and gas, as well as containing alternating plate channels for oil and gas combined into a multilayer package and for buffer channels located between the oil channels and gas channels by separating them. All channels contain load-bearing walls, corrugated nozzles as ribbing channels, and bars that are located on two opposite edges of the plate channels parallel to each other, and between them parallel corrugated nozzles are installed with the possibility of flow direction. The corrugated nozzles of the buffer channels are perpendicular to the corrugated nozzles of the gas channels and oil channels, and two opposite edges of the buffer channel are open to the atmosphere. The oil channels and gas channels contain, at two opposite cross angles, buffer cavities bordering the inlet and outlet distributors, limited by bars and having an outlet along the corrugated nozzles into the atmosphere. Each pipe for oil and gas supply is installed in the corresponding distributing collector of the heat exchanger obliquely, at an angle of less than 180 degrees to the vertical axis of symmetry of the heat exchanger.

The utility model is illustrated by drawings, which show:

FIG. 1 is a general view of a plate-finned gas-oil heat exchanger with inlet and outlet nozzles for oil and gas;

FIG. 2 is a diagram of an arrangement of oil channels for gas and buffer channels in a multilayer package of a plate-fin gas-oil heat exchanger;

FIG. 3 is a diagram of a channel for oil of a plate-fin gas-oil heat exchanger;

FIG. 4 is a diagram of a channel for gas of a plate-fin gas-oil heat exchanger;

FIG. 5 is a diagram of a buffer channel of a plate-fin gas-oil heat exchanger.

The plate-fin gas-oil heat exchanger contains a collecting 2 and distributing 4 oil manifolds, collecting 5 and distributing 3 gas manifolds with corresponding inlet 27, 29 and outlet 28, 30 pipes, as well as a multi-layer package 1 with plate channels 6 for oil, plate channels 7 for gas, lamellar buffer channels 8. Lamellar channels 6 for oil consist of bearing walls 9, corrugated nozzles 10 and bars 11, 17, contain buffer cavities 12, 13, inlet distributors 14, outlet distributors 15. Buffer cavities 12 and 13 are laminar channels 6 for oil with corrugated nozzles are limited by bars 11 and 17. Lamellar channels 7 for gas consist of bearing walls 18, corrugated nozzles 19 and bars 20, 26, contain buffer cavities 21, 22, inlet distributors 23, outlet distributors 24. Buffer the cavities 21 and 22 of the lamellar channels 7 for gas with corrugated nozzles are limited by bars 20 and 26. The lamellar buffer channels 8 consist of load-bearing walls, which are simultaneously load-bearing walls of 9 oil channels and load-bearing walls of 18 gas channels, corrugated GOVERNMENTAL nozzles 16 and 25 bars.

During the operation of a plate-fin gas-oil heat exchanger, hot oil from the engine mounts or a supercharger (not shown) and cold fuel gas from a gas pipeline after a fuel gas preparation system (not shown) enter a multilayer package of 1 heat exchanger channels. In the multilayer package 1, oil channels 6, gas channels 7 and buffer channels 8 are organized. Hot oil enters the distribution manifold 4 through the oil inlet 27 to the distribution manifold 4. The inlet 27 is installed obliquely in the distribution manifold 4 at an angle of less than 180 degrees to vertical axis of symmetry of the heat exchanger. The coolant flow passes through the inclined pipe and enters at an angle on the walls of the distributing manifold. Due to the generated vortex flows, the most uniform distribution of the supplied coolant is provided directly at the entrance to the heat exchanger in front of the heat transfer channels. Further, a pre-uniformly distributed oil flows through the inlet distributors 14 into the channels 6, flows along the bars 11, flows around the corrugated nozzles 10 soldered to the bearing walls 9. After convective heat exchange, gathering in the outlet distributors 15, it enters the collecting manifold 2 for oil and through the pipe 28 returns already cooled to the engine or supercharger mounts.

Cold fuel gas enters the inlet pipe 29 for gas in the distribution manifold 3. The inlet pipe 29 is installed in the distribution manifold 3 obliquely, at an angle of less than 180 degrees to the vertical axis of symmetry of the heat exchanger. The gas flow passes through the inclined pipe and enters at an angle to the walls of the distributing manifold. Due to the resulting vortex flows, the most uniform distribution of the supplied fuel gas is provided directly at the entrance to the heat exchanger in front of the heat exchange channels. The pre-uniformly distributed fuel gas enters through the inlet distributors 23 into the channels 7, flows along the bars 20, flows around the corrugated nozzles 19 soldered to the supporting walls 18. After heat exchange, collecting in the outlet distributors 24, it enters the collecting manifold 5 for gas and through the pipe 30 enters already heated into the combustion chamber of a gas turbine engine or supercharger (not shown).

Organized in the multilayer package 1 of the heat exchanger buffer channels 8 with bars 25 and corrugated nozzles 16 are used to ensure safety during emergency destruction of one or more of the bearing walls 18 of the gas channels 7. The made buffer cavities 12 and 13 are used to ensure safety during depressurization on the soldered joint of the bars 17 with the bearing walls 9 of the oil channels 6, and the buffer cavities 21 and 22 are used to ensure safety during depressurization on the soldered connection of the bars 20 with the bearing walls 18 of the channels 7 for gas.

Thus, mounting the inlet pipes for oil and gas in the corresponding distribution manifold obliquely, at an angle of less than 180 degrees to the vertical axis of symmetry of the heat exchanger, an improvement in the uniformity of the distribution of coolant flows at the inlet to the distribution manifolds is achieved, the heat transfer efficiency is increased without complicating the design of the inlet pipes and distributing collectors while maintaining the safety of the heat exchanger.

Claims (1)

A plate-fin gas-oil heat exchanger containing distributing and collecting manifolds with oil and gas nozzles, comprising alternating plate channels for oil and gas combined in a multilayer package and gas channels, which are located between the oil channels and gas channels, separating them, at this all channels contain load-bearing walls, corrugated nozzles, like ribbing channels, and bars, which are located on two opposite edges of the plate channels, parallel to each other, and between them parallel but he installed corrugated nozzles with the ability to direct the flow of media, while the corrugated nozzles of the buffer channels are perpendicular to the corrugated nozzles of the gas channels and oil channels, and two opposite edges of the buffer channel are open to the atmosphere, while the oil channels and gas channels contain two opposite cross angles, buffer cavities bordering the entry and exit distributors, bounded by bars and having an exit along the corrugated nozzles into the atmosphere, which differs in That each tube for supplying oil and gas distributing as set in the respective manifold of the heat exchanger obliquely at an angle less than 180 degrees to the vertical axis of symmetry of the exchanger.

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