US1798330A

US1798330A - Heat-exchange apparatus

Info

Publication number: US1798330A
Application number: US107230A
Authority: US
Inventors: Leek Albert Edward
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-09-18
Filing date: 1926-05-06
Publication date: 1931-03-31
Anticipated expiration: 1948-03-31

Description

Marh 31, 1931. A. E. LEEK 1,798,330

HEAT EXCHANGE APPARATUS Filed May 6, 1-926 2 Sheets-Sheet 1 C 0 f% a \00000000000 m venan March 31, 1931.

Filed May 6, 1926 I I I A. E. LEEK HEAT EXCHANGE APPARATUS 2 Sheets-Sheet 2 'aaz,

mveniar' Patented Mar. 31, 1931 UNITED STATES Application filed May 6. 1926, Seri PATENT. OFFICE ALBERT EDWARD LEEK, WIGAN, ENGLAND HEAT-EXCHANGE APPARATUS This invention relates to heat exchange apparatus and has for its object to provide an improved construction and arrangement of the economizer or heater as employed for 5 water heating purposes, to adapt it also for the efiicient pre-heating of air, required, for

example, for combustion in the generator furnace or furnaces.

The inventlon comprises a combmed air and wate r heater for steam generating plant consisting of the combination of nested tubes or ducts and an enclosing casing or enclosing tubes such that intermediate ducts are provided through which the hot gases flow, the

latter contacting with the exterior surface of the inner units and the interior surface of the outer units of said nested tubes or ducts.

Referring to the accompanying explanatory drawings:-

Figure l is a sectional elevation showing,

in diagrammatic form one manner of carrylng the invention into effect.

Figure 2 IS a sectional end view showing one arrangement of the tubes or ducts of my improved economizer or feed water heater and Figure 3 a similar View showing another arrangement.

Figure 4; is a sectional View in diagrammatic form showing another manner of carrying the invention into effect.

The same reference letters in the different views indicate the same or similar parts.

As is illustrated at Figures 1 and 2, the

water tubes (in (of which in Figure 1) extending only four are shown between headers as b of the economizer or feed water heater, are each provlded with an outer tube 0 extending between the end plates hot gase d of a casing e. The ous products admitted at f flow through the spaces between the said nested tubes at and a, passing and returning through those in half to the outlet at g. gases is indicated by the arrows 1 at Figure 1.

The air to casing c which is fitted sion plat through from f through the half of the casing e the upper Such flow of the hot said spaces in the lower be heated is admitted at h to the with a baflie or divie i such that the air after passing the spaces between the respective al No. 107,230, and in Great Britain September 18, 1925.

outer tubes 0 in the upper half of the casing, returns through the like spaces in the lower half to the outlet at Such flow of the air, which is in a counter direction to the flow of the hot gases, is indicated by the arrows 2 at Figure 1.

The water flows through one set of tubes a and returns through the other set. It may be passed through one set of tubes only or through more than two sets to suit require deflect the air from row of water tubes a is enclosed by one outer H tube or duct 0 of a rectangular section. As in the previous example, the hot gases flow through the spaces between the exterior of the water tubes and the interior of the enclosing tubes or ducts 0, whilst the air flows in the spaces, as 1, between the exterior surfaces of the said ducts c. The latter may be corrugated and the tubes placed in a staggered formation.

In the arrangement shown in Figure 4, the air is passed through tubes m, encloses concentric hot gas and water tubes 0 and a respectively. The separate tubesmay be connected to headers as shown. Or the arrangement may be such as to cause the air and water to be heated in several stages: a

single stage heating as shown may however be utilized.

Suitably curved deflecting surfaces are provided for the respective changes of direction of the gases and of the air with a view to the maintenance of the velocity of flow.

The surfaces of the tubes exposed to the hot gaseous products of combustion can be cleaned by the aid, for example, of steam ]ets in the known manner.

each of which What I claim is A combined air, Water and flue-gas heat interchanger comprising in combination a circular easing, end plates spaced from the ends of said casing, pairs of tubes arranged concentrically one Within the other between said end plates and arranged in quincunX, means for passing flue gas through the annular passage between said tubes which are arranged so that the gas flows in double pass, means for passing Water through the inner tubes and means for passing air over the outer surfaces of said tubes such that the air and Water flow in double pass and in contra flow to the movement of the flue gas from Which heatis extracted, and fiat, longitudinal, segmental plates arranged Within said casing, each plate being parallel in cross sectional View to a line through the axes of the nearest row of tubes, so as to restrict the passage of air through the apparatus and to avoid dead spaces.

In testimony whereof I name to this specification.

ALBERT EDYVARD LEEK.

have signed my