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Патент USA US2108135

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Feb. 15, 1938.
J. J. NELIS `
STEAM GENERATOR
Filed May 15, 1935
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2,108,135
2,108,135
Patented Feb. 15, 1938
PATENT OFFICE
UNITED STATES
2,108,135
STEAM GENERATOR
Joseph J. Nelis, Brooklyn, N. Y., assignor to
Foster Wheeler Corporation, New York, N. Y., a
corporation of New York
Application May 15, 1935, Serial No. 21,519
4 Claims.
(Cl. 122-485)
This invention relates to steam generators.
More particularly, the invention pertains to steam
generators having separately ñred superheaters
and other heat utilizing and heat recovery
5
devices.
.
The invention provides an improved arrange
ment and combination of steam generating, su
perheating, and other heating apparatus which
makes possible a high degree of operating eili
10 ciency, high fuel economy and great flexibility of
control under fluctuating demands with respect
to ñnal steam temperatures and pressures, and
which is primarily adapted to marine use and
the severe operating conditions and requirements
15 on shipboard from the standpoint of both safety
and economy.
In recent years„the use of greatly increased
steam pressures and temperatures has become
common practice in the marine ñeld, and furnace
A20 and boiler efficiencies closely approximate those
of the modern steam plants on land. Due to this
development, however, and to the demand> for
increased pressures and superheated steam of
high temperatures, a particular 'problem has
25 arisen with respect to turbine operation when
that superheat control is readily obtainable re
gardless of boiler operation within the available
space requirements in marine use.
The various particular features of novelty
which characterize the invention are pointed out 5
in the claims annexed to and forming a part of
this specification. For a better understanding of
the invention, however, reference may be had to
the accompanying drawing in which:
Fig. 1 is a vertical sectional view of steam l0
generating apparatus embodying the invention,
taken on line I-I of Fig. 2, and
`
Fig. 2 is a vertical sectional view taken on line
2-2 of Fig. 1.
Referring to the drawing, reference character 15
Ill designates the setting of a steam generator
having a furnace II, upper and lower drums I2
and I3 respectively, having a bank of steam gen
erating tubes I4 extending therebetween, and wa
ter wall tubes I5. A plurality of burners I6 of 20
suitable type having means for controlling the
intensity of'ñring are disposed-in one or more of
`
the walls of the furnace II. Bailles I1 and I8
provide three passes for the furnace gases over
at sea and taking it in and out of port. When
the steam generating tubes I4. The wall I9 of 25
the setting has an opening 2|) in its upper por
tion, through which the gases flow from the
going astern or in any maneuver requiring a
third gas pass into the flue 2l having an econo
maneuvering >the present day turbine driven ship
reversal of the forward drive of the ship, the re
' 30 versing wheel of a marine type reversing turbine
can not be subjected to the same high steam pres
sures and temperatures as may properly be em
ployed on the normal forward drive, without the
possibility of serious damage such as pitting or
35 stripping of the blades, since the reversing side
of marine turbines is not capable of withstand
ing such severe operating conditions. The need,
therefore, of an economical and ready means for
at certain times reducing and controllingthe
40 temperature of the superheated steam on ship
board .is apparent, and to this end my inven
tion is directed.
mizer 22 and an air heater 23 disposed therein.
A vertically extending wall 24 which is spaced 30
from wall I9 and in parallel relationship there
with provides a superheater compartment 25 hav
ing a superheater 26 located in its upper portion
below the passage 20 and connected with» the
steam space of the upper drum I2 by a conduit 2l. 35
A burner 28 of any suitable type having means
for readily. controlling the intensity of firing ls
disposed in the lower portion of one of the walls
forming the superheater compartment 25 which
connects with the lower end of the ñue 2I. If 40
desired, a plurality of such burners may be so
disposed.
.
J
With this arrangement it will be perceived that
effort to meet this problem consists in injecting the superheater is separately fired and the degree
45 streams of water into the superheated steam line _ of superheat may readily be controlled by control- 45
to the turbine. Although the temperature of the _ ling the operation of the superheater burner 28
independently of the operation or ilring of _the
superheated steam is thus reduced it has the dis
advantage, that unless carefully controlled, of boiler. In other words, the degree of superheat
being dangerous since the introduction of jets obtainable may be varied from zero to maximum
_50 or streams of water into the highly heated steam entirely independently of steam generation. 50
may-cause slugs of water to enter and injure the Moreover, the gases leaving the superheater com
partment after having passed over the superheat
turbine.
er, enter the boiler ilue 2l and are further cooled
The object of the present invention is to pro
by their passage over the economlzer and air
vide a steam generator having a superheater com
One method used in marine practice in an
55 bined therewith in the setting in such manner
heater 22 and 23 respectively, thereby materially>
2
2,108,135
contributing to the overall efficiency and economy
of the unit. The superheater is preferably placed
in the same general steel casing structure that
encloses the boiler.
_
With steam generators embodying the inven
tion, a ready and dependable control of the de
gree of superheat is at all times available, and at
the same time a high degree of operating ef
ñciency is maintained. My invention has a spe
10 cial application to marine use, where due to
maneuvering in port, or emergency stoppage, and
reversing at sea, a 10W degree of superheat be
comes essential because of temperature limita
tions with respect to turbine operation under the
15 above conditions.
It will be understood,- however, that other types
of steam generators than that disclosed herein
may be utilized without departing from the prin
ciples of the invention which is not to ¿be limited
20 except by the scope of the appended claims.
Having thus described my invention, what I
connected to a common oiftake flue, the steam
generator and the superheater being disposed
ahead of the point of junction of the gas out
lets from said sections with the common offtake
ñue with respect to the direction of ñow of the
gases passing from said sections, the arrangement
being such that by control of the means for tir
ing the superheater section alone any desired de
gree of superhe'at from zero to maximum may be
obtained.
~
3. A steam generating plant comprising a set 10
ting, a furnace therein. a steam generator in the
setting, a fuel burner for ñring the furnace, a
superheater compartment in the setting, a super
heater disposed wholly in the compartment and 15
connected to the steam generator, a-fuel burner
for firing the superheater, said compartment be- '
ing arranged to shield the superheater from heat
radiated from said furnace and to prevent gases
from said furnace from contacting the tubes of 20
the superheater, and a flue connecting with the
claim is:
setting and being so arranged relative to the fur
1. A steam generating plant comprising a set
nace and the superheater compartment that the
ting, a furnace therein, a steam generator in the . gases from said furnace pass to the flue Without
25 setting, means for firing the furnace, a super
contacting the superheater and that the gases
heater compartment in the setting, a superheater from the superheater compartment pass to the 25
in the compartment and connected to the steam flue Without contacting the steam generator, the
generator, separate means for firing the super
superheater compartment occupying a minor por
heater, said compartment being arranged to
30 shield the superheater from heat radiated from
said furnace and to prevent gases; from said fur
nace from contacting the tubes of the super
heater, and a iiue connecting with the setting
and beingso arranged relative to the furnace
35 and the superheater compartment that the gases
from said furnace pass to the ñue without con
tacting the superheater and that the gases from
the superheater compartmentV pass vto the flue
without contacting the steam generator, the su
40 perheater compartment occupying a minor por
tion of the setting, the arrangement being such
that by control of the means for firing the super
heater alone any desired degree of superheat
from zero to maximum may be obtained.
Í45 2. A steam generating plant comprising a set
ting, a vertically extending partition in the
setting forming a steam generating section and
a superheating section, a steam generator in the
steam generating section, a superheater in the
50 superheating section and connected to the steam
generator, separately controlled means for iìring
each section, and gas outlets from each section
tion of the setting,- the _arrangement being such
that by control of the fuel burner for iiring the 30
superheater. alone' any -desired degree of super
heat from `zero to maximum may'be obtained.
'4. A steamgenerating plant comprising a set
ting, a vertically extending partition in the set
ting forming a steam generating section and a 35
superheating section, a steam -generator in the
steam generating section, a superheater in the
superheating section and connected to the steam
generator, separately controlled fuel burners for
firing each section, and gas outlets from each sec
tion connected »to a ‘common oiïtake flue, the 40
steam generator and the 'superheater being dis
posed ahead of the point of junction of the gas
outlets from said section with the common ofi'
take flue with respect to the direction of iiow of
the gases passing from said sections, the arrange- `
ment being such that by control of the fuel
burner for firing the superheater section alone
any desired degree of superheat from zero to
maximum may be obtained.
50
JOSEPH J. NELIS.
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