Technological process for accurately controlling calorific value of IGCC synthesis gas

Abstract

The invention discloses a technological process for accurately controlling the calorific value of IGCC synthesis gas. A gasification furnace, a mixer and a steam heater are included. Synthesis gas and medium-pressure steam produced by the gasification furnace are respectively introduced into the mixer to be mixed and then introduced into the steam heater, and the flow of the medium-pressure steam injected into the steam heater is controlled by a steam regulating valve controlled by the superheat degree of the synthesis gas mixed with the medium-pressure steam; on the premise that the pressure of the synthesis gas at the inlet of a low-calorific-value gas turbine is not changed, the medium-pressure steam and the synthesis gas are uniformly mixed through the mixer, so that the aim of reducing the calorific value is fulfilled. According to the process flow for precisely controlling the calorific value of the synthesis gas, the used medium-pressure steam is self-produced medium-pressure steam of the gasification furnace, so that equipment required in a conventional calorific value reducing method and equipment maintenance work and cost caused by the equipment are avoided, the cost is saved, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of IGCC gas turbine low-nitrogen combustion, in particular to a process flow for precise control of the calorific value of IGCC syngas. Background technique [0002] IGCC (Integrated Gasification Combined Cycle) integrated gasification combined cycle power generation system is an advanced power system that combines coal gasification technology and efficient combined cycle. The synthesis gas produced by the gasifier contains about 26vol% hydrogen. The combustion characteristics of hydrogen (mixed with air has a wide flammable range, low ignition point, fast combustion propagation speed, high flashback risk, high flame temperature, instability, low Blowout limit) determines that IGCC gas turbines cannot adopt the premixed low-nitrogen combustion method like conventional natural gas gas turbines (injecting air before feeding into the gas turbine to dilute the calorific value of natural gas to achieve low-nitrog...

AI Technical Summary

Problems solved by technology

To dilute the calorific value of synthesis gas by injecting N2 or CO2, it is necessary to introduce equipment for producing N2 or CO2, which increases production and maintenance costs, wastes resources, and affects work efficiency.

Images