Method for cooling and efficiency improvement of double-working-medium combined cycle turbine

Abstract

The invention relates to the technical field of gas turbines and steam turbines and discloses a method for the cooling and efficiency improvement of a double-working-medium combined cycle turbine. According to the method, the working media comprises combustion gas and water (steam), wherein the combustion gas is generated in a combustion chamber; the water is subjected to phase change in a phase change chamber; two kinds of potential energy are respectively generated and do work together; wet steam which is generated in the phase change chamber is mixed with the combustion gas, and the mixture does work, so that the total quantity of the working media can be adjusted; and a second working medium, namely the water of which the temperature is equal to the steam-liquid interface temperature is introduced into the phase change chamber, parts of the turbine are cooled and the water is subjected to the phase change simultaneously, so that the potential energy is thoroughly used. Two turbine-type engines with different combustion modes are combined into one turbine, so that the aim of making two different working media do Brayton cycle and Rankine cycle in the turbine in a tandem mode is fulfilled. The combustion gas is replaced by a large quantity of steam, so that the oil consumption rate is reduced, the carbon dioxide emission is reduced proportionately, and the double-working-medium combined cycle turbine is low-carbon and environment-friendly. The temperature of an engine is controlled and regulated according to a new concept, the heat-work transformation capacity of a single engine is greatly improved, the heat efficiency is more than or equal to 60 percent, and emission of harmful gas is eliminated.

Description

[0001] technical field [0002] The invention relates to the technical fields of gas turbines and steam turbines, and aims at a method for eliminating thermal damage, improving thermal efficiency, and reducing self-consumption work of gas turbines, that is, a method for cooling and improving efficiency of a duplex combined cycle turbine. It is suitable for the power source of large and small walking machines and table machines on land and water. Background technique [0003] Thermodynamics believes: "'heat' cannot be directly converted into mechanical work, but must be aided by working fluid." [0004] In the existing technology, "heat~working medium-mechanical work", the source of "heat" is the calorific value of fuel, which is a fixed value; The structure is precisely fixed, which is also a fixed value; "mechanical work" is the conversion of fixed "heat" with a fixed "working medium", and the result of "mechanical work" must also be a fixed value. [0005] Therefore, the r...

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