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Патент USA US3022990

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Feb. 27, 1962
J. MAIR
3,022,985
SILENCER AND HEAT RECOVERY SYSTEM
Filed June 6, 1958
2 Sheets-Sheet 1
LI
Feb. 27, 1962
J, MAIR
3,022,985
SILENCER AND HEAT RECOVERY SYSTEM
Filed June 6, 1958
2 Sheets-Sheet 2
United States Patent 0 Nice
2
1
‘3022985
SILENCER AND HIZIAT, RECOVERY SYSTEM
James Mair, Chatham, N.J., assignor to Chicago Bridge
&. Iron Company, Chicago, 11]., a corporation of
lllmols
Filed June 6, 1958, Ser. No. 740,452
9 Claims. (Cl. 261-451)
3,022,985
Patented Feb. 27, 1962
FIGURE 1 is a schematic elevation view and ?ow dia
gram of one embodiment of the invention;
FIGURE 2 is a schematic elevation view and ?ow dia
gram of another embodiment of the invention.
Although the invention is set forth in detail in terms of
its application to a concrete curing plant in which the
vapor to be condensed is steam, it is not restricted there
to. Thus in another application the vapor can be any
other condensible vapor, and the cooling liquid any liquid
This invention relates to a novel combination noise
silencer and heat recovery system for use in connection 10 of choice, as will'be apparent to those skilled in the art.
Referring to FIGURE 1, the system of the invention
with pressure vessels which are subjected to cyclical oper
comprises an insulated boiler feed water storage tank 10,
ation, such as, for example, steam autoclavesfor pressure
curing of concrete products.
7
together with boiler feed water circulating tubes 13 and
15 and boiler feed water circulating pump 14; and a con
‘In the cyclical operation of pressure vessels of the type
under consideration, relatively large amounts of 'heat in 15 densate surge tank 11, together with circulating con
densate tubes 17 and 20, condensate circulating pump 21,
the form of vhot vapors are introduced into the vessel dur
and condensate over?ow tube 19. The body 12 of the
mg the warm-up portion of the vcycle, relatively small
silencer-recovery system contains boiler feed water heater
amounts of heat in the form of vapor are introduced after
tubes 16 connected by manifolds, e.g., 16a, to the boiler
the vessel has reached its operating temperature and dur
feed water tube 13 and boiler feed water return tube 15.
mg the holding portion of ‘the cycle, and then all vapors
These heater tubes 16 are positioned in the lower part of
and uncondensible gases inside the vessel are rapidly dis
body 12 so as to be submerged in the condensate which
charged from the vessel vduring the blowdown portion of
collects therein during normal operation of the system.
the cycle. The blowdown portion of the cycle usually
Also located inside the body 12 is a cold condensate pipe
comprises an extremely small portion of the total time
cycle, and heretofore it ‘has been di?icult to recover any 25 22 which is attached to the condensate circulation pipe 17.
Attached at spaced intervals along pipe 22 are spray noz
signi?cant amounts of heat from the ‘blowdown vapors
zles 23. Condensate return pipe 20 is attached to the
becauseof the extremely short ‘time available for accom
plishing such heat recovery.
bottom of the body 12. A control valve 18 is located in
the cold condensate pipe 17.
The rapid release of blowdown vapors to the atmos
phere, in addition to being ine?icient because of the sub
The steam blowdown line 24 from the pressure vessel
stantial heat loss involved, also presents troublesome
enters the body 12 at one end, at a point above the level
noise problems which become critical when pressure ves
of the condensate 28 therein. The ?ow of blow-down
sels located in congested business or residential areas
steam through line 24 is controlled ‘by means of valve
must be blown down.
24a, which, if desired, can be interconnected by any suit
My invention has general applicability to any situation 35 able means, mechanical or otherwise, with valve 18 so
that these valves operate in unison, opening and closing
wherein vapors under pressure must be released quickly
substantially simultaneously. A hot condensate pipe 25
from a pressure vessel. A typical and particularly ad
also may be connected to the body 12, to carry ho-t con
vantageous application is in the steam curing of concrete
densate which forms in the pressure vessel into the body
products. Concrete products are usually steam cured in
autoclaves, in which the operating cycle typically consists
of thevintroduction of steam in large quantities into the
charged autoclave ‘for a period of approximately three
hours, followed by a four hour holding period in which
relatively small additional quantities of steam are intro
duced to overcome normal radiation and convection
‘12. A waste ?uid vent 26 is provided at the other end of
the body 12. The invert of this vent 26 is positioned at
the level at which the condensate is desired to be main
tained in the body 12.
It may be desirable on some installations to provide
limited venting of the pressure vessel, particularly during
the warming portion of the cycle. When such venting oc
losses and to maintain the proper operating temperature
and steam pressure. At the end of the holding period
curs there is necessarily a certain amount of steam and
the autoclave is blown down within a period of approx
hot vapor which passes through the vents in addition to
imately 15 minutes. Unless an e?ective silencer is used,
the non-condensible gases which it is desired to be vented.
.the blowdown steam is discharged at such high velocities 50 Under such a situation, further economy can be achieved
as to emit an objectionably high level of noise. Since
by passing the vented gases through the condensate in
most concrete products plants are located in developed
the silencer-heat recovery system body and thereby con
densing the steam and vapors. A vapor vent inlet for
business or residential areas so as to be close to the source
of demand, it is necesary to restrict the emisison of noise
this purpose is shown in FIGURE '1 as item 27.
to modest levels. For this reason, a silencer similar to the 55
In operation, the boiler feed water circulation pump
14 runs continuously, circulating boiler ‘feed water be
typical automobile engine vmother, in which bai?es are
tween the heater tubes 16 and the vboiler feed surge tank
provided to muffle the noise, is used in many autoclave
10. The hot condensate pipe 25 remains open at all
installations. This type of silencer, however, has not
times, thus supplying hot condensate to the body 12 in
proved eifectiveto reduce the noise to acceptable ‘levels.
heat exchanging relation with the boiler feed water cir
Furthermore, in ‘the normal installation, no attempt is
culating within the heater tubes 16. The condensate
made to recover ‘the ‘heat of the steam and the vapors
circulation pump 21 also runs continuously pumping
discharged during the blowdown period because of the
cooled condensate from the lower portion of the body
extremely large quantities which are discharged in a very
12 into the condensate surge tank 11 through the con
short period of time.
densate pipe 20. As an additional optional feature, a
65
In accordance with this invention there is provided a
condensate overflow pipe 19 is connected between the
greatly improved combination silencer and heat recovery
top of the condensate surge tank and the body 12, and
system for use in venting hot condensible vapors underv
remains open at all times, so that as the condensate
pressure. The invention, which for convenience will be
surge tank 11 becomes full, the warmer condensate which
referred to as a “silencer-recovery system,” is described
has risen to the top over?ows into pipe 19 and is re
in more detail in the following paragraphs in which refer 70 turned to body 12 for additional heat recovery.
ence is made to the appended drawings, in which:
During the initial high heat input portion of the cycle,
3,022,985
35
scribed are given for purposes of illustration only, and
no undue limitation of the breadth of the following claims
is to be implied.
What is claimed is:
1. A combination silencer and heat recovery system
for reducing noise emitted as a result of the rapid dis
charge of hot vapors from a pressure vessel and for re
covering heat from said vapors, comprising a body por
a substantial amount of steam in the pressure vessel is
condensed. This is a relatively dirty hot condensate
which cannot be mixed with boiler feed water. it flows
through the condensate pipe 25 into the body 12 to pro
vide heat to the external surfaces of the boiler feed water
heater tubes 16. The same process continues through
the holding portion of the cycle. By the time the blow
down portion of the cycle has been reached, substan
tion having a hot vapor inlet and a waste ?uid outlet
tial amounts of heat have been extracted from the hot
condensate water through the heater tubes 16 into the 10 spaced apart from said inlet; means for maintaining a
pool of condensate within said body portion; ?rst valve
boiler feed water and thus is in the form of usable or
means for controlling the ?ow of said vapors through
sensible heat. The temperature of the condensate, con
said inlet; a plurality of heat exchange tubes in said
versely, has been reduced and the cooled condensate is
body portion positioned below the normal surface level
pumped into the condensate surge tank 11.
At the start of the blowdown portion of the cycle, con 15 of said pool of condensate, so that during normal op
eration of the system said heat exchange tubes are sub~
trol valve 18 opens as the steam blowdown line valve
merged in said pool of condensate; a cooling-liquid stor
24a is opened. Thus, cool condensate stored in the
age tank; means including a ?rst pump for circulating
condensate surge tank, as above described, ?ows through
a cooling liquid between said tubes and said storage
condensate pipe 17 into pipe 22 and out through spray
tank; a condensate surge tank isolated from said cooling
nozzles 23 to form a condensing mist which condenses
liquid storage tank; means including a second pump for
large quantities of steam coming into the body 12 from
withdrawing condensed vapors from said body portion
the blowdown pipe 24. This process of rapid condensa
into said condensate surge tank; means including second
tion transfer substantial quantities of heat into the con
valve means for intermittently introducing condensate
densate at the bottom of the body 12 and also greatly
from said condensate surge tank into said body portion;
reduces the volume of waste vapors and gases which must
and dispersing means within said body portion for break
be discharged through vent 26. This reduction in vol
ing condensate so introduced into discrete particles.
ume of discharged wastes measurably decreases the noise
2. The apparatus of claim 1 having means communi
level attributable to the blowdown operation.
cating between the top of said condensate surge tank and
The heat thus rapidly extracted from the blowdown
steam by means of spraying cool condensate through such 30 said body portion for recirculating condensate between
said surge tank and said body portion when said surge
steam can then be exchanged from the condensate to
tank is full.
the boiler feed water during the next cycle of operation,
3. The apparatus of claim 1 in which said second valve
a period of some seven hours in the case of concrete
curing autoclaves. The blowdown portion of the cycle
means is interconnected to said ?rst valve means where
by both said valve means open and close substantially
may consist of from about one-tenth to about one-?ftieth
of the total time for the cycle. It can be seen, therefore,
that this invention makes it possible to recover blow
down steam heat which is captured by means of a spray
simultaneously.
4. The apparatus of claim 1 in which said dispersing
means comprises a pipe equipped with a plurality of spray
nozzles.
during the short blowdown portion of the cycle and to
5. The apparatus of claim 1 in which said dispersing
transform such heat into usable boiler feed water heat 40
means comprises a plurality of baf?e plates arranged for
during the succeeding cycle. Furthermore, the bene?ts
impingement thereon of said condensate from said con
obtained from this invention are multiplied when the
densate surge tank.
silencer-recovery system is connected to a bank of two
6. The apparatus of claim 1 in which said condensate
or more pressure vessels which operate in overlapping
surge tank is located at an elevation above any part of
cyclic periods, because only a single silencer-recovery
system body is required.
said body portion whereby condensate from said surge
tank may ?ow by gravity to said dispersing means.
7. The apparatus of claim 1 in which said dispersing
The embodiment shown in FIGURE 1 is a silencer
recovery system which can be placed below the ?oor of
a room in which it is desired to accomplish spaceheat
means is located between said ?uid inlet and said ?uid
outlet in said body portion.
ing, thus giving added economy to the operation. Al
8. The apparatus of claim 1 in which said body por
though in this embodiment the body 12 is horizontally
tion includes a hot condensate inlet whereby hot liquids
elongated, it is not to be inferred that the invention is
may be introduced into said body portion.
so limited. Any desired con?guration of body can be
9. The apparatus of claim 1 which includes a vapor
used without departing from the principles of the in
vention. For example, another embodiment is shown in 55 vent inlet in said body portion at an elevation below the
normal condensate level whereby vented gases and va
FIGURE 2, in which the silencer-recovery system body
pors introduced through said inlet are cooled and con
is a vertical cylinder with the condensate surge tank
located on top. The numbering of parts is the same as
densed by contact with said condensate.
in FIGURE 1, except that horizontal splash baf?es 30
positioned inside the body 12 take the place of the spray 60
nozzles 23 shown in FIGURE 1, with the cool conden
sate being introduced through a pipe at the top of the
body. As the condensate splashes against the ba?les it
becomes a stream of discrete particles capable of rapid
ly condensing large quantities of steam passing upward
through the body.
Other modi?cations may be made by persons skilled
in the art without departing from the principles disclosed
in this application. The speci?c details shown and de
6
References Cited in the ?le of this patent
UNITED STATES PATENTS
282,902
314,559
537,325
Keller ________________ __ Aug. 7, 1883
Baragwanath ________ __ Mar. 31, 1885
Webster _____________ __ Apr. 9, 1895
1,818,483
Kensig ______________ __ Aug. 11, 1931
453,268
Germany ____ _._ _______ .... Dec. 1, 1927
FOREIGN PATENTS
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