GB865996A - Improvements in heat exchange installations - Google Patents

Abstract

865,996. Heating forced-flow steam boilers by hot gasses. HUET, A. March 5, 1959 [March 10, 1958], No. 7747/59. Classes 123(2) and 123(3) In a heat exchange installation, for utilizing the heat liberated in a nuclear reaction and in which the heat exchange elements are incorporated in a plurality of casing tubes through which the reactor coolant passes downwardly in parallel, low and high pressure evaporator and economizer sections d, f and c, e respectively are accommodated in a first casing tube a and either a high or low pressure economizer section' g (a high pressure economizer being shown) and low and high pressure superheaters h, i are housed in a second tube casing b. Circulation pumps j, k withdraw water from low and high pressure steam and water drums m, t and force it respectively through pipes q, u leading to the low pressure evaporator d and the high pressure economizer e, water from a condenser, not shown, being introduced into the low pressure economiser c through a pipe r. The pumps j, k are by-passed by conduitsy, z to ensure natural circulation of water in the event of failure of the pumps. Conduits l, s lead steam from the low and high pressure evaporators d, f to the corresponding steam and water drums m, t from which it passes, through pipes n, u to the respective low and high pressure superheaters h, i communicating with output headers p, x. Water from the condenser, introduced to the high pressure economizer g through a pipe r1, passes into pipe u leading to the high pressure economizer in the casing a. The high and low pressure steam and water drums m, t may be common to a group of casing tubes a, b. A steam and water separator 5, Fig. 2, of the helical type is associated with each evaporator, the upper and lower headers 3, 4 incorporating gyration coils 11, 10. Water from the separator 5 descends through a tube 6 disposed axially within a central water tube 7 and is entrained with the water supplied to the lower headers 4, a deflector 9 being arranged around the lower end of the tube 6. Specifications 822,417, 823,904 and 838,742 are referred to.