| 摘要 |
<p>The method and the installation are intended to increase the energetic efficiency of gas-steam turbine at a simultaneous reduction of nitric oxides concentration in the flue gases. The invention could be applied in energetics. A characteristic feature of the method is that the gas-steam turbine is divided into stages, each of them with a combustor, as overheated water steam is transferred to the first stage of the turbine. After the turbine, the gas-steam mixture is passed to a heat exchanger for heat utilisation and for obtaining water steam required. Afterwards, the heat is additionally utilised to heat district heating water in a countercurrent heat exchanger and in a system of contact economisers, where the water steam condenses. The condensate is purified chemically and, after evaporating and overheating the steam, is passed to the first combustor. Air is transferred in stoichiometric amounts to the combustors, without the last one to which it is transferred in a small surplus. The burning temperature in the last combustor is lower. This leads to a significant reduction of nitric oxides concentration in the flue gases at a high process energetic efficiency. The installation includes multistage gas-steam turbine (6), equipped with combustors (4), air compressor (2), combined heat exchanger (10) for heating the products entering the combustors, heat exchanger (31) for heating district heating water, contact economisers (15), connected to pump (16) and heat exchanger block (13), as well as a column for purifying the water condensate from carbon dioxide and oxygen, heat exchangers (22 and 25), block for chemical purification of water condensate (21), and pumps (20 and 28).</p> |
