Gas-steam combined cycle and technology heating furnace heat integration technology

Abstract

A gas-steam combined cycle and technology heating furnace heat integration technology comprises the following steps that at the proper position where thermal power plant gas turbine tail gas enters awaste heat boiler, a heat exchanger is newly added, and gas turbine tail gas partially or completely enters the heat exchanger; after being conveyed into the heat exchanger for temperature rise, heating furnace feed enters a heating furnace; gas turbine tail gas discharged out of the heat exchanger is divided into one strand, after the strand of gas turbine tail gas is mixed with existing combustion supporting air preheated through smoke of the heating furnace, the gas is conveyed to a fire nozzle, and the rest of gas turbine tail gas continuously runs according to the original process to enter the waste heat boiler for steam generation; heating furnace smoke discharged out of an air preheater is directly guided to the position in front of a waste heat boiler evaporator or guided to the position in front of a waste heat boiler overheater to be mixed with the gas turbine tail gas to generate steam, finally, the gas is emptied from a waste heat boiler chimney, and correspondingly, an original heating furnace chimney is shut down. According to the gas-steam combined cycle and technology heating furnace heat integration technology, through crossing unit system heat integration, upgrading and balanced utilization of gas turbine tail gas, technology heating furnace smoke waste heat and gas turbine tail gas high-temperature chemical energy are achieved, the smoke discharging process of the heating furnace is simplified, and the gas-steam combined cycle and technology heating furnace heat integration technology is suitable for new factory construction and old factory transformation.

Description

technical field [0001] The invention belongs to the field of process industry such as chemical industry, and in particular relates to a heat integration process of gas-steam combined cycle and process heating furnace. Background technique [0002] With the improvement of energy consumption structure, more and more self-provided thermal power plants of large-scale process industrial enterprises (such as petrochemical enterprises) adopt gas-steam combined cycle to realize cogeneration of heat and power. However, subject to the constraints of users, waste heat boilers generally produce 3.5MPa or 1.0MPa steam (saturation temperatures are 243°C and 184°C, respectively), which makes high temperature (about 600°C), oxygen-enriched (molar oxygen content about 13%) gas turbine exhaust The energy efficiency of the second law of thermodynamics is low. For example, when non-supplementary combustion waste heat boilers are used, the oxygen-enriched chemical energy of the tail gas has not ...

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Problems solved by technology

[0003] In order to solve the low energy efficiency of the second law of the high-temperature oxygen-enriched gas turbine in the self-provided gas-steam combined cycle thermal power plant of large-scale process industrial enterprises due to the generation of medium-pressure or low-pressure steam, and the heating furnace of adjacent process equipment due to low feed temperature Due to the disadvantage of high fuel consumption, the purpose of the present invention is to provide a deep heat integration process of gas-steam combined cycle and process heating furnace to efficiently and balancedly utilize the high-temperature heat energy and oxygen-enriched chemical energy of the exhaust gas of the combustion engine

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