US2270704A - Steam generator - Google Patents

Description

Jan. 20, 1942. BlERSACK 2,270,704

STEAM GENERATOR Filed Oct. 16, 1939 Imus/Li a)".- Ji l c/zcz-rczf Bah/"$6252 Patented Jan. 20, 1942 UNITED STATES STEAM GENERATOR Richard Biersack, Berlin-Wilmersdorf, Germany, assignor to Patentverwertungs- Gesellschaft mit beschrankter Haftung Hermes, Berlin, Germany, a corporation of Germany Application October 16, 1939, Serial No. 299,780 In Germany July 28, 19-38 3 Claims.

This invention relates to a steam generator of the tubular type in which the temperature is regulated by injecting water into the superheater.

In the copending application Serial No. 289,514, filed August 11, 1939, is described a steam generator, particularly a steam generator with forced passage of the operating medium in which the temperature is regulated by injecting water into the superheater and in which the superheater is divided, at the point where the water injection occurs, into two sections between which is inserted a cold lying heating surface. The additional heating surface is thus disposed in a zone where the temperature is lower than that prevailing in the zone containing the superheater.

The object of the present invention is to improve such an arrangement; the additional or auxiliary heating surface or conduit is disposed according to the invention in the same heating zone as the last part of the heating surface provided for the evaporation.

In the accompanying drawing is shown an arrangement according to the invention in diagrammatic form.

Referring to the drawing, the steam generator which is heated by a furnace l is subdivided by an intermediate wall 2 into a radiation part 3 and a contact part 4. The hot gases flow from the radiation part into the contact part in the direction as indicated by the arrows 5. The operating fluid is supplied by a pump 6 to the economizer l lying in the radiation part and then to the heating surface 8 which constitutes the first part of the evaporator.

After the operating fluid has flown through this heating surface part it reaches the second zone of evaporation or the second part of the evaporator in which the temperature is lower and where it is completely converted into steam and slightly superheated in the heating surface part II). The temperature of the operating medium is then increased in the superheater section II.

Behind this section is inserted a device l3 for regulating the temperature by injection of water. The water injection conduit is denoted by the reference numeral I9. The final superheating of the operating fluid is effected in the superheater section l2. The additional heating surface or conduit inserted as disclosed in the above copending application between the superheater sections II and I2 is arranged according to the present invention substantially in the same heating zone as the evaporator section 9, i. e., in the last zone of evaporation. The advantage of such an arrangement consists in providing approximately the same heat conditions in the heating surface part as in the heating surface part 9, so that the advantages resulting from the arrangement of the heating surface part 9 are also present in the auxiliary heating surface I5.

An impulse control [4 is provided for the wa.- ter injection control. This control includes a thermostatic device for regulating the operation of a valve indicated in the drawing between the conduit l9 and the device I3.

In controlling a steam generator with forced passage of the operating fluid it is preferable to employ a quantity measuring device [8 and to insert the latter between the pump and pipe system, in which case also control impulses for the quantity of water supplied may also be derived from the quantity measuring device. In such an arrangement the injection water may be branched off behind the quantity measuring device, viewed in the direction of fiow of the operating fluid, as shown by the line L! connected at point 2|.

The quantity measuring device I6 may be associated with a static disk ll. The operating medium supplied by the pump flows through the device I1, and the quantity passing through this device is measured and indicated by the meter Hi.

What is claimed is:

1. A steam generator system comprising a first heating zone subjected to a relatively high temperature, a second heating zone subjected to a temperature which is lower than that obtaining in said first zone, an evaporator composed of a plurality of serially related sections with the last section thereof wherein evaporation of residual Water takes place disposed within said second heating zone, a superheater disposed within said first heating zone and serially connected with said last section of the evaporator, a device for injecting water into steam leaving said superheater to control the temperature of the steam supplied thereby, and an auxiliary heating section connected with said device and receiving .said injection water, said auxiliary heating section being disposed within said second heating zone and subjected therein to temperature conditions which are substantially identical to those acting upon said last section of the evaporator.

2. The generator system and structure defined in claim 1, together with a pump for supplying water to said system to be converted into steam therein, a measuring device disposed between said pump and said system to control the amount of water supplied thereto, and a conduit connected between said measuring device and said system for supplying water to said injection device.

3. The generator system and structure defined in claim 1, wherein said superheater comprises two separate sections both disposed within said first heating zone, and wherein said water injection device and said auxiliary heating section are serially connected between the two sections of the superheater.

RICHARD BIERSACK.

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