Method for combined heating and power of aluminum oxide plant

Abstract

The invention discloses a method for combined heating and power of an aluminum oxide plant. On the basis of a traditional gas turbine combined cycle combined heating and power system, appropriate craft adjustment is carried out, and the power and the fume exhaust parameters of a gas turbine are determined according to the requirements of a high-pressure digestion system. The method for combined heating and power of the aluminum oxide plant has the advantages that for an aluminum oxide high-pressure digestion system, it can be achieved that heating and power are both given consideration to andare balanced, and isolated network operation can be achieved; and meanwhile, on the aspects of energy saving and environmental protection, compared with the situation that a traditional aluminum oxideplant owns a thermal power plant for fire coal, the gas turbine combined cycle combined heating and power system has the advantages of being higher in comprehensive thermal efficiency, cleaner in exhausted fume, smaller in occupied area and the like.

Description

technical field [0001] The invention relates to a new process method for cogeneration of heat and power in an alumina plant, in particular to a gas turbine combined cycle cogeneration system of heat and power for an alumina high-pressure stripping system. Background technique [0002] The heat used in the alumina plant is usually supplied by a self-contained thermal power plant in the form of cogeneration of heat and power. In recent years, the energy consumption of alumina has been greatly reduced, and the parameters of high-pressure steam (dissolution) required by it have also changed greatly: the pressure at the user is 8.59MPa, and the temperature is 300°C. The amount of low-pressure steam is very small, and even a certain amount of low-pressure steam is only consumed when the alumina process system is started. Therefore, it is difficult for self-provided thermal power plants to meet the requirements of both heat and electricity and balanced supply of heat and electrici...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult for self-provided thermal power plants to meet the requirements of both heat and electricity and balanced supply of heat and electricity under the above heating mode

At the same time, with the increasing requirements for environmental protection year by year, the investment and operation of coal-fired thermal power plants in environmental protection facilities will increase the unit production cost of alumina

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