Recuperative heat exchanger of tube-type furnace

FIELD: heating.

SUBSTANCE: invention relates to power generation equipment and is to be utilised in recuperative heat exchangers during petroleum processing. The recuperative heat exchanger of a tube-type furnace contains a housing with ducts for inlet and outlet of the furnace fuel combustion products, a distribution chamber with a partition, a tube grid and sockets for inlet and outlet of the fluid reheated and a floating head with a cap and a movable tube grid connected to the distribution chamber via tube bundles (the direct one - from the distribution chamber to the floating head and the inverse one - from the floating head to the distribution chamber). Specificity of the heat exchanger design consists in the upper end of at least one tube of the inverse tube bundle being positioned in immediate proximity to the apex of the floating head cavity with its lower end curved and positioned coaxially and inside the distribution chamber outlet socket. The proposed heat exchanger design eliminates the risk of the fluid injection pressure shocks and discontinuity of the fluid flow in the inverse tube bundle.

EFFECT: improved efficiency of the recuperative heat exchanger operation.

1 dwg

 

The invention relates to power equipment in the field of oil refining, in particular, to a device for heat recovery combustion gases combusted in the furnace fuel (gas, fuel oil, etc.) by pre-heating the oil in is installed in the duct furnace recuperator.

Known heat exchangers used for heat exchange processes for systems "gas-liquid", for example, the heat exchanger on the application of EN (21) 2005137971/06 (13) A, F28F 1/00 from 16.12.05 [1], which includes a parallel section of a number of straight finned tubes, the ends of which are mounted collectors, is made tubular and mounted on the ends of each section..and the heat exchanger on the application of EN (21) 2005127290/06(13) A, F28F 19/00 from 2005 [2]containing tube with fixed them in the heat exchange tubes, placed in the cylindrical housing with a bottom and forming with the bottom casing of the mechanical mortar chambers separated by solid partitions...

However, the known heat exchangers cannot be used for heating the oil in the heat exchanger, tube bundle which is located in the duct, i.e. in the gas stream of combustion products of the fuel pipe furnaces, because:

1) in the process of its heat is intense emission from the liquid (oil) and gaseous fractions, forming a floor in the areas of heat exchangers steam-tube, which disrupt the continuity of fluid flow in pipes cause water hammer and uncontrolled growth of the discharge pressure, as well as to local overheating of the elements of heat exchangers;

2) a large temperature difference between the heating agent and the heated liquid (100°C) leads to the emergence of large longitudinal thermal stresses in rigid elements (shell and tubes) of these heat exchangers.

Also known heat exchangers with floating head, for example, described in the catalogue "heat exchangers shell and tube floating head..." 1 and 2, C.11 [3]that best allow you to use them as regenerative heat exchangers at their vertical location (floating head up in the chimney, in this case the chimney will play the role of a casing of the heat exchanger.

The specified heat exchanger floating head, as the closest to the technical nature of the proposed device, taken as a prototype.

The presence of a prototype floating head eliminates the occurrence of longitudinal thermal stresses in the tube bundles regardless of the temperature of heating agent in the case of the heat exchanger and the heated fluid inside the heat exchanger tubes.

However, the prototype is not devoid of characteristic and for other Izv the local exchangers lack, I had to face and that is that the gas-vapor mixture, formed by heating the oil in the forward (from the distribution chamber to the floating head) tube bundle, accumulates in the cavity of the floating head, forming a tube that causes the growth to increased hydraulic resistance and increase the pressure on the main line of the feed pump, and subsequent periodic slippage of this tube in the opposite tube bundle (from floating heads to the distribution chamber) leads to a hammer, the discontinuity of the fluid flow, which in turn reduces the efficiency of the process of heat transfer in the tube bundle and the heat exchanger in General.

The aim of the invention is the elimination of the above disadvantages and improving the efficiency of the regenerative heat exchanger.

The problem is solved in a recuperator tube furnace, comprising a housing with a channel for entry and exit of products of combustion of the furnace, the distribution chamber with baffle, tube sheets and fittings for inlet and outlet of the heated fluid and the floating head cover and the movable tube sheet connected to the distribution chamber two tube bundles (direct from the distribution chamber to the floating head and the opposite from the floating heads to the distribution chamber), so that the upper end of the at least one tube in the opposite tube bundle is located in close proximity to the upper point of the cavity of the floating head, and its lower end is curved and is located coaxially with and inside the output fitting of the distribution chamber.

As a result of such technical solutions within the cavity of the floating head gas-vapor mixture is collected in the upper part and then play on the said tube into the distribution chamber of the heat exchanger directly to the output fitting this distribution chambers and further outside of the heat exchanger, without leading to the mentioned negative consequences.

The drawing schematically shows a longitudinal section of the proposed regenerative heat exchanger.

Offer recuperative heat exchanger consists of a casing 1, which is the body of the tubular duct of the furnace and provided with a socket 2 for entry of the gaseous products of combustion from the furnace. The casing 1 is fixed on the distribution chamber 3 of the heat exchanger, equipped with a septum 4, tube sheet 5 and fittings 6 and 7, respectively, for entry and exit of the heated liquid (oil). In the upper part of the heat exchanger is floating head 8 with the cover 9 and the tube sheet 10. Floating head 8 is connected to u is deletelines camera 3 direct 11 and back 12 and tube bundles. At least one tube 13 in the opposite tube beam is designed so that its upper end is located in close proximity to the upper point of the cavity of the floating head 8, and the lower end of this tube is curved and is located coaxially with and inside the output fitting 7.

The proposed regenerative heat exchanger as follows.

The feedstock (oil) before applying in a tubular furnace is directed through the nozzle 6 into the left cavity of the distribution chamber 3 and then by direct pipe 11 to the beam in the cavity of the floating head 8, and out through the opposite tube bundle 12 is in the right cavity of the distribution chamber and then through the fitting 7 is removed from the heat exchanger and sent in a tube furnace. Gaseous products of combustion from the furnace through the nozzle 2 are fed into the chimney (the casing of the heat exchanger 1), washed tube bundles 11 and 12, giving them warmth, and discharged up the chimney. The oil in the tube bundles 11 and 12 is heated to a predetermined temperature. In the process of heating the oil in the forward beam pipe 11 is the most intensive allocation of her steam-gas mixture, which together with oil is supplied to the floating head 8, where the gas-vapor mixture separated from the oil is collected in the upper part of the cavity of the floating head, but not having had time to accumulate and form in the last gas is robco, immediately diverted through the pipe 12 into the distribution chamber 3 directly into the socket 7 and further into the tubular furnace. As a result, the flow of oil in the opposite tube bundle 12 includes only a small number of gas-vapor mixture, which does not lead to discontinuity of fluid flow in the tube bundle, and removal of the gas tube in the cavity of the floating head eliminates the increase in the discharge pressure by a feed pump, and eliminates the occurrence of water hammer in the system. In the end, stabilization of the operating parameters of the heat exchanger, and also increases the efficiency of the process of heat transfer in the recuperator, i.e. the efficiency of the process heat recovery combustion gases combusted in the furnace fuel.

Sources of information

1. Application №EN (21)2005137971/06(13) AND, F28F 1/00 from 16.12.05, Bulletin of inventions, 2007

2. Application №EN (21)2005127290/06(13) A, F28F 19/00, 2005, Bulletin of inventions, 2007

3. Catalogue "heat exchangers shell and tube floating head...", JSC VNIINEFTEMASH, Moscow, 2001, page 11, figures 1 and 2.

Recuperative heat exchanger tube furnace, comprising a housing with a channel for entry and exit of products of combustion of the furnace, the distribution chamber with baffle, tube sheets and fittings for inlet and outlet of the heated fluid and the floating head with cu is scoi and the movable tube sheet, connected with the distribution chamber two tube bundles (direct from the distribution chamber to the floating head and the opposite - from the floating heads to the distribution chamber), characterized in that the upper end of the at least one tube in the opposite tube bundle is located in close proximity to the upper point of the cavity of the floating head, and its lower end is curved and is located coaxially with and inside the output fitting of the distribution chamber.



 

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