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1. (WO2017153022) THERMAL STEAM POWER PLANT WITH IMPROVED WASTE HEAT UTILIZATION AND METHOD FOR OPERATING SAME

Pub. No.:    WO/2017/153022    International Application No.:    PCT/EP2016/082825
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Dec 30 00:59:59 CET 2016
IPC: F01K 13/00
F01K 13/02
F22G 5/12
Applicants: MITSUBISHI HITACHI POWER SYSTEMS EUROPE GMBH
Inventors: DATCHEV, Datcho
Title: THERMAL STEAM POWER PLANT WITH IMPROVED WASTE HEAT UTILIZATION AND METHOD FOR OPERATING SAME
Abstract:
In the case of a steam power plant (24, 24a) comprising a steam generator (SG) with a connected water/steam circuit (25) and, integrated therein, a turbo set (3), wherein the water/steam circuit (25) has at least one high-pressure injection cooler (11) which opens (29) on the injection side downstream, in the flow direction of the water/steam circuit (25), of an evaporator (2) of the steam generator (SG) into the steam flow conveyed in the water/steam circuit (25), and which, on the inflow side, is in a line connection (30a, 30b, 30c), conveying injection water, to a first feed water extraction point (12) downstream of a feed water pump (9) and upstream of a high-pressure preheating unit (10), and/or to a second feed water extraction point (13) downstream of the high-pressure preheating unit (10) and upstream of the steam generator (SG), the intention is to achieve a solution which permits greater utilization of condensation heat from the water/steam circuit of a steam power plant, and thus permits an improvement in the efficiency of the power plant at an at least constant steam generator efficiency. This is achieved by the high-pressure injection cooler (11) being, on the inflow side, in a line connection (30a) that guides the injection water and has a high-pressure injection cooler preheating unit (20), by means of which supplied injection water can be heated, by transferring heat and/or admixing steam, using the condensation heat or condensation enthalpy taken from the water/steam circuit (25) and/or obtained from the supplied steam.