Gas turbine circulated generation process for combining high (mediate) calorific value gas and low calorific value gas

Abstract

The invention relates to a combustion engine combination cycle power plant with low heat value, a co-production of the combustion engine combination cycle thermal power plant, an integrated coal gasification cycle combination (IGCC) power plant, and the like. The invention adopts the new technique of gas turbine combined cycle power generating that the high and intermediate heat value gas cooperate with the low heat value gas, and the invention is a technology with high efficiency and low pollution. A low NOx burner provided with a gas turbine and an afterburner boiler adopt a self-cycle preheating heat-storing volution type low NOx gas burning system, therefore the power consumption of the gas supercharger can be reduced by 10-20 percent and the thermal efficiency of the electricity generating of the combined cycle unit can be increased for 5-15 percent. The invention can also solve the problems of the technology difficulty for reconstructing the system and the project cost. The invention can also provide stable combustion for burning the low heat value gas (blast furnace gas), can enable steam cycle system to have larger installed capacity and higher efficiency, and can lower the kilowatt cost. The invention ensures that the combined cycle thermal efficiency can reach about 60 percent, the electricity generating efficiency of the power plant can reach about 55 percent, and the energy can be saved for above 80 percent. The invention can break through a bottleneck that the investment and the electricity generating cost of the intermediate low heat value gas electricity plant are much higher than that of high heat value combined cycle power plant, namely the economic problem, and then the investment cost of the intermediate low heat value gas power plant (or the IGCC) can be lowered greatly.

Description

technical field [0001] The present invention; high, (medium), calorific value coal gas and low calorific value gas gas turbine combined cycle power generation new technology, involving low calorific value gas turbine combined cycle power plant, gas turbine combined cycle thermal power plant cogeneration, integrated combined cycle power plant (abbreviated as IGCC), etc. . technical background [0002] Gas turbines were originally designed to burn high-quality fuels such as natural gas or light diesel oil, and later developed gas turbines that used heavy oil (poor quality and high ash content). With the expansion of the application range of gas turbines, people began to consider using low calorific value gas as fuel for gas turbines. An important reason is thermal efficiency. At present, conventional coal gas is configured with a combined cycle unit with a thermal efficiency of 51% to 56%, and the thermal efficiency of power generation technology can reach 40.8% to 44.8%. T...

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Problems solved by technology

[0004] (1) The power supply efficiency is low, and the superiority of its high efficiency has not been fully demonstrated. Furthermore, the system is not optimized, and power recovery is not obtained, resulting in energy loss; the steam cycle is not optimized, resulting in insufficient utilization of the gas turbine exhaust waste heat

[0005] (2) Higher than investment cost and power generation cost

[0006] (3) The whole system has not been comprehensively optimized, it is only a simple combination of various technologies and equipment, and the optimal configuration of each subsystem has not been considered

[0024] When the conventional natural gas-fired gas turbine is converted to burn medium-low calorific value gas (blast furnace gas), almost the main components of the original gas turbine must be properly modified; (1) increase the size of the gas system

(2) The adjustment system must be modified

[0039] The calorific value of low calorific value gas (blast furnace gas) is only about 800Kcal / m3, the theoretical combustion temperature is only about 1100°C, and the actual combustion temperature is lower, which cannot be met by conventional combustion technology.

According to the conventional configuration, the power generation efficiency will be reduced by 10% compared with the thermal efficiency of the high calorific value gas turbine combined cycle.

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