US2341738A - Steam plant - Google Patents

Description

Feb. 15', 1944. K. F. oLlN 2,341,738

STEAM PLANT Filed Dec. 18, 1940 2 sheets-sheet 1 2 Sheets-Sheet4 2 K. F. oLm

STEAM PLANT Filed Deo. 18, 1940 l .n j@ lip/e Feb. 15, 1944.

Patented Feb. 15, 1944 Application Decemberl, 1940, SerialNo. 370;7'1'1 In Sweden April 5, 1938V 2y 0121111111.v (ci. 237-67) This `invention relates to a steam plant comprisin-g at least two steam systems for different pressures, having steam-consuming, devices and -having steam traps coupled between the steam systems of different pressures. In such plants a leakage ofV steam often occurs in the steam traps,'

for instance as a result of valves being inefficaciously closed, valves and valve seats being corroded, or impurities such as pieces of packings, precipitations of boiler scale or rust flakes being jammed between the valve and the seat, thereby impeding the valve from being tightly. closed. Furthermore for different reasons, such as wear and too great play in joints, steam traps may get locked and thereby be put out of function.

Besides a loss of fuel, a leaking steam trap involves the risk that other machines or heating apparatus connected in parallel to the same steam and condensation-water system may be put out of service due to back steam from the leaking steam trap preventing the escape of the condensation water.-

In a steam power plant, comprising more than two, for instance three, steam systems of diiferent pressures, a first group, comprising a number of steam-consuming devices with steam traps in series with a steam separator, may be connected between the systems of the highest and the intermediate pressure and a second such group between the systems of the intermediate and the lowest pressure, and the outlet pipe for condensation water from the steam separator in said rst group may be connected with thev steam separator in said second group.

With this invention it is possible `without inconvenience to use closed condensation water systems regardless of the number of steam systems of different pressures, so that leakage steam and the heat of the condensation water can be continually utilized without the risk of a stoppage of machines owing to hindered escape of their condensation water. A fault may also be easily located.

The invention is illustrated by way of example in the accompanying drawings, in which:

Fig. 1 is a vertical section of a steam separator according to the invention,'and

Fig. 2 is a diagram of a steam power plant a with such separators.

In th'e drawings I indicates the casing of a steam separator for collecting the condensation water and leakage steam coming through a pipe 5 from a number of steam traps (not shown) belonging to high pressure apparatus located bevfore the separator: The end of the pipe 5 is provided witha silentY working mouthpiece located below the water level in the casing I.. The water level is indicated by a water gauge glass 3 andthe steam pressure by a manometer ll'. By means of parallel plates 2 water particles are separated from the steam when passing between the plates, and the steam passes to a steam system of lower pressure through a pipe l provided with a throttle valve 8 and a two- Way valve 9. The condensation Water leaves the container at the bottom through a pipe lil, which is conducted at an angle up to a level above the mouthpiece E and is provided with a trap II. The steam pipe 1 and the water pipe It are connected by a pressure levelling pipe I2 with a water trap I3, a stop-valve I4 and a non-return valve I5. I6 is a water supply pipe and Il an air escape or vacuum valve. v

For the leakage control based on the steam pressure the manometer 4 may be used, and this can suitably be combined with a steam whistle I9 provided with a safety-valve. For the continuous indication a registering pressure instrument I8 can be placed on the steam separator, For the temperature indication a thermometer 2U or the like is provided in the pipe 'I for the steam and another 2l in the pipe for condensation water. It is thus possible to ascertain the condition within the separator and be aware of faults in the steam traps connected thereto.

Fig. 2 shows diagrammatically the use of the steam separators in a steam-power plant comprising three steam systems, for instance in a paper mill. To a high pressure steam conduit H for, e. g., 8 atm. pressure are connected a number of sulphite boilers F1, F2, Fs and F4 with steam traps K1, K2, K1 and-K4, which in groups of two in each are connected with the steam separators A1 and A2 of the construction shown in Fig. 1. From these separators steam is supplied to a low pressure net L for, e. g., 2 atm. pressure. To the net L are connected drying cylinders F11 and F12 with steam traps K11 and K12, from which steam and condensation water are conducted to the steam separator A11, and from this steam passes to a conduit V under a pressure of 0.5 atm. To A11 also the condensation water outlets from the steam separators A1 and A1 may be connected in order to utilize the heat in the condensation water from the latter. Finally, for the purpose of local warming, radiators F21 and F22 may be coupled between the conduit V and a return pipe O to the feed water tank lower pressure steam system, an outlet pipe for condensation water on a level above the bottom of said steam separator, an inlet pipe for condensation water and leakage steam from said steam traps ending on a level lower than the highest level of said outlet pipe for condensation water, and means for indicating the condition of the steam within said steam separator.

2. A steam plant, comprising three steam systems of diierent pressures, a first group of apparatus, comprising a number of steam-consuming devices connected at one end to the system of the highest pressure and at, the other end, in series with a steam trap and only by pipes adapted to convey condensation water, to a common steam separator having an outlet for condensation water and a steam outlet, said steam outlet being connected to the system of the intermediate pressure, a second group of steamconsuming devices connected at one end to the system of the intermediate pressure and at the other end each in series with a steam trap to a second common steam separator having an outlet for condensation Water and a steam outlet connected to the system of the lowest pressure, said steam separators having means for indicating the condition of the steam within said steam separators, said outlet for condensation water from the steam separator in said rst group being connected with the steam separator in said second group, said outlet for condensation water from the steam separator in said second group being connected with a return pipe, and steamconsuming devices connected between said system of the lowest pressure and said return pipe.

KRISTIAN FRIDOLF OLIN.

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