KR-20260066250-A - Coal Blending Method for Integrated Gasification Combined Cycle

KR20260066250AKR 20260066250 AKR20260066250 AKR 20260066250AKR-20260066250-A

Abstract

The present invention provides a coal blending method for coal gasification combined cycle power generation, comprising a pre-raw material determination unit that determines the mixing ratio of coals having different properties and the amount of flux added at a stage prior to feeding raw materials into a gasifier. The pre-raw material determination unit relates to a coal blending method for coal gasification combined cycle power generation, comprising: a first step of calculating an estimated liquidus temperature value from a database of properties of two or more types of coal and an FeO triangular diagram; a second step of comparing the estimated liquidus temperature value with a reference liquidus temperature value; and a third step of determining the amount of flux added so that the estimated liquidus temperature value and the reference liquidus temperature value match.

Inventors

장요한
박지은

Assignees

한국서부발전 주식회사

Dates

Publication Date: 20260512
Application Date: 20241104

Claims (5)

In the stage prior to feeding the raw material into the gasifier of a coal gasification combined cycle power plant, Step 1: Calculating an estimated liquidus temperature of the input raw material from a coal attribute database and an FeO triangle diagram; A second step of comparing the above estimated liquidus temperature value with a reference liquidus temperature value corresponding to the gasifier operating conditions; A preliminary raw material determination unit comprising: a third step of determining the amount of flux added so that the estimated liquidus temperature value and the reference liquidus temperature value match; Coal mixing method for combined cycle coal gasification power generation.
In paragraph 1, The above coal property database is characterized by including volatile matter, ash, higher calorific value, ash melting point, Na₂O + K₂O , S/A ratio, and Fe₂O₃ + MgO +CaO ratio. Coal mixing method for combined cycle coal gasification power generation.
In paragraph 2, A coal mixing method for coal gasification combined cycle power generation, characterized in that the above Fe₂O₃ + MgO + CaO content does not exceed a minimum of 15 % to a maximum of 25%, and the Fe₂O₃ among the above Fe₂O₃ + MgO + CaO is controlled to 15% or less.
A coal blending method for coal gasification combined cycle power generation, characterized in that, in claim 1, the coal blending process according to the above-mentioned pre-raw material determination unit additionally includes a major indicator review step.
A coal blending method for coal gasification combined cycle power generation, characterized in that the above-mentioned main indicator review step sets the fly ash unburned content alarm, O2 /Coal ratio, Membrane Wall Total Duty, CO2 verification, and O2 /C molar ratio as main indicators, and may further include ash content (%, DB), S/A ratio, and Na2O+K2O3 ( % ).

Description

Coal Blending Method for Integrated Gasification Combined Cycle The present invention relates to a coal blending technology for coal gasification combined cycle power generation, and more specifically, to a coal blending method for coal gasification combined cycle power generation using coal having different properties as feedstock. Although coal is one of the raw materials with guaranteed supply stability due to its abundant and extensive global reserves, the volatility of coal prices has increased as the global supply and demand structure undergoes real-time changes driven by factors such as rising demand for thermal coal in countries like China and India, and export restrictions imposed by major coal-producing nations. Furthermore, demand from developed countries has begun to rise as the value of clean coal utilization technologies, such as the Integrated Gasification Combined Cycle (IGCC), which emits lower levels of pollutants like carbon dioxide and sulfur dioxide compared to conventional coal power generation, increases. Consequently, as coal supply volumes and costs fluctuate sensitively depending on international affairs and natural disasters, it is necessary to diversify coal sources and secure process technologies capable of maintaining a certain level of gasification efficiency to ensure the stable operation of IGCC. Typically, in the operation process technology of a coal gasification combined cycle power plant, the fuel determination unit is characterized by determining whether to mix flux (additive) into the coal based on the gasification suitability results and providing an operation guide according to the flux input ratio. It is characterized by selecting a primary target coal from the primary coal types, analyzing plant performance while changing the mixing ratio of secondary target coals at a predetermined rate, and controlling the gasification plant after determining gasification suitability. Since low-quality syngas is produced due to the instability of the initial operation, the above control method requires an operation method suitable for the initial operation. In addition, conventional technology that uses a mixture of coals with different characteristics in coal gasification combined cycle power generation controls the amount of flux, such as fly ash, according to the SiO2 , Al2O3 , and other ( FeO3 , CaO) components contained in the coal. Since the main purpose of this technology is to reduce the cost of input raw materials by adding fly ash and additives, there is a need for technology development that also considers the setting of mixing ratios for coals with different characteristics. Figure 1 is a triangular diagram for calculating the liquidus temperature to explain the coal mixing method of a combined coal gasification power generation according to an embodiment of the present invention. Figure 2 is a viscosity graph before and after the addition of flux according to a viscosity calculation formula to explain the coal mixing method of a coal gasification combined cycle plant according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this invention, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The above-described coal blending method includes a pre-raw material determination unit that determines the mixing ratio of coals having different properties and the amount of flux to be added prior to the raw material input stage. The above-mentioned pre-raw material determination unit is characterized by comprising: a first step of calculating an estimated liquidus temperature value based on a SiO2-Al2O3-CaO phase equilibrium diagram according to FeO content and a database of coal properties of two or more types; a second step of comparing the estimated liquidus temperature value with a reference liquidus temperature value corresponding to the operating conditions of the gasifier; and a third step of determining the amount of flux added so that the estimated liquidus temperature value and the reference liquidus temperature value match. The m