US1868431A - Proportioning blowdown water with boiler feed water - Google Patents

Description

C. W. RICE July 19, 1932.

PROPORTIONING BLOWDOWN WATER WITH BOILER FEED WATER Filed Aug. 5, 1927 III @ EQE Patented July 19, 1932 PATENT OFFICE CYRUS WILLIAM RICE, OF PITTSBURGH, PENNSYLVANIA PROPORTIONING IBLOWDOWN WATER WITH BOILER FEED WATER Applicationfiled August ;5, 1927.

The object of this invention is to automatically control or proportion the flow of blowdown water from a boiler with the flow of feedwater to the boiler, the means employed constituting a modification of the means described in an application for patent filed by me June 24, 1927, Serial No. 201,272.

A further object is to provide a valve responding to variations in pressure in the 19 boiler feeding means, for governing the discharge of blowdown water from the heat exchanger,this valve being associated with a float controlled valve in an open heater, when such heater is used, but in any event being responsive to variations resulting from the fluctuating demands of the boilers for feed water.

With the foregoing and other objects in view, the invention consists in the novel con- 29 struction and arrangement of elements described, illustrated and claimed, it being understood that modifications may be made within the scope of the claims without departing from the spirit of the invention. Fig. 1 of the drawing is an elevational view of my blowdown and feed water control apparatus; Fig. 2 is a detail showing of the element of Fig. 1; Fig. 3 is a view showing the lever system for operating the feed water valve 46 of Fig. 1; Fig. 4 is a sectional view showing in detail the feed water valve 46 of Fig. 1; Fig. 5 is a sectional view showing in detail the blowdown control valve of Fig. 1; and Fig. 6 shows the relation of the. coils 13 to the pipe 18 of Fig. 1.

In the heat exchanger, designated generally by the letter E, the hot blowdown water from a boiler or boilers passes downwardly thru coil 13 and thru manifold 18, and thru a pressure regulating device referred to below. From this regulating device the blowdown water flows to a point of discharge.

The relatively cool boiler feed water enters thru pipe 25 and passes thence upwardly thru r casing 15, connected with lower casing element 24, and connected also with upper casing element 20. The boiler feed water thus flowing in a direction around coil 13 opposite to the direction in which the hot blow- 50 down water flows thru that coil, passes out- Serial No. 210,937.

wardly from upper casing member 20 into pipe 23 leading toward an open heater 40 of standard type.

The water level within this heater 40 is controlled by float 41 connected with pivoted 55 arm 42, rod 43, link or the like 44 and stem 45 of valve 46. This valve last named is in pipe 47 which pipe 23 communicates thru an orifice plate 48 having a port 49 of reduced size. This plate is mounted in a suitable manner, the mounting means being designated generally by the reference character 50, and the plate may be replaced when desired by another plate having an orifice of increased or decreased size.

A pipe 54 is connected with pipe 47, and is in communication, at its lower end, with the pressure regulating device referred to below.

The pressure regulating valve may be of standard type and includes a valve element 55 and a diaphragm 56 connected with the valve element by means shown conventionally at 57 and influenced by weighted arm 58. The extent to which this valve opens determines the rate of flow thru the discharge connection 59 leading from the coil 13 carrying blowdown water.

The flow of the blowdown water, toward the point of discharge, is proportioned with the fiow of feed water, since the varying pressure in pipe 47 is determined by the operation of valve 46 controlled by float 41 in the open heater, this float responding to the conditions produced by variation in water level as the demands of the boiler increase or diminish. The variation in pressure in the section of pipe 47, between orifice plate 48 and valve 46, is manifested within the pipe 54 of reduced diameter and connected with the pressure chamber on one side of the diaphragm 56 of the pressure regulating valve. It is obvious that any standard type of structure may be employed at the point where the diaphragm controlled device is located. The opening or port 49 in orifice plate 48 is important, with reference to size, and the plate may be replaced by another, as previously indicated, if no open heater is in use. In that event, a valve on the boiler would act in the same way as valve 46 in varying the pressure in pipe 47.

When the concentrations in a boiler are too high or too low, and it is desired to correct these conditions, the force acting on valve through lever arm 58 is varied, and the pressure in pipes 47 and 54 increased or decreased, thereby controllingithe flow of blowdown Water past valve 55,"'With a resulting control of the boiler concentrations. Having described the invention whatis claimed is 1. In anapparatusof the class described,

a boiler feed Water pipe, a pipe for conducting boiler blowdown water to apoint ofdischarge, means to regulate the flow through said last named pipe for continuously regulating and proportioning the flow of blowconnection for blowdown water passing from the heat exchanging device, a difierential pressure governed valve under variable manual control, for this discharge connection, and a pipe leading from the heat exchanging device for'conveying feedwater partially heated toward a boiler, and having a connection communicating with the difierential pressure control, v

3, In an apparatus ofthe class described, a heat exchanging device including a pipe conducting boiler feedwater and a pipe conveying boiler blowdown water, a discharge connection for blowdown water passing from the'heat exchanging device, a pressure controlled valve for this discharge connection, a pipe leading from the heat exchanging device for conveying feedwater partiallyheated toward a boiler, means for varying the pressure in said feed Water pipe including apartition in the feed Water pipe having an orifice of predetermined size and a water level actuated valve, said valve being arranged to open and close with fall andv rise of a water level, wherein said fall and rise is respectively incident to increase and decrease of boiler output; said pressure controlled discharge valve being so responsive to variation in pressure in said feed water secondary heating means to said boiler, conduit means connecting said primary and secondary heating means, conduit means for supplying Water to said primary heating means, mechanism automatically controlled by the Water level of said secondary heating means for controlling the supply of heating fluid; to: the primary heating means, said mechanism including'a pressure responsive valve in said heating fluid conduit, thevalve closing. and opening. respectively with increase and decrease of pressure in the conu t wns s ing; he heate s1 and adjustable means for varying the opening movement of saidvalve.

5. An apparatus comprising the elements of claim 3,- coo perating as there specified, and aheatericonnected with the feed water pipe and adapted for'connection with a boiler, the valve opening and closing operation being the result of, change in waterlevel Within the heater 6. A structure c'omprisingthe elements of claim 4, the said mechanism including an apertured-partition within the conduit which connects the primary and secondary heating means, the aperture of. said partition being a reduced port of predetermined size.

In testimony whereof I: aiiix my signature.

' CYRUS WILLIAM RICE.

conveying pipe as to open and close respectively "with decrease and increase in pressure in sald feed water pipe.

4. In an apparatus of the. class described,

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