High-density pressurized fluidized bed coal gasification apparatus and method

Abstract

A high-density pressurized fluid bed coal gasification device and a method relate to a gasification device and a method which are especially suitable for the efficient treatment of the high-sulfur, high-ash and high ash fusion point coal with high reserve volume in China and have the advantages of broad coal type adaptability, high carbon transformation ratio in the gasification process, high heat value of coal gas, low investment and excellent environment-friendly performance. A gasification reactor (1) is arranged in a pressure shell (2) and is divided into a dense-phase turbulent flow fluidizing section (9), a high-density core-annulus flow section (10) and a density rapid flow section (11) from bottom to top, and according to the gasification character of the goal with high sulfur, high ash and high ash fusion point, flow states with different features are adopted for pressurizing and sectionalized gasification from bottom to top and the pressure for gasification is 1.0-2.5MPa.

Description

technical field [0001] The invention relates to a high-density pressurized fluidized bed coal gasification device and method, belonging to the technical field of coal gasification. technical background [0002] Coal gasification can better solve the pollution problem in the process of direct coal combustion. For example, integrated coal gasification combined cycle is the cleanest coal-fired power generation method; not only that, but coal gasification can also form high-value products, such as coal-based Chemical production, especially in the production of synthetic ammonia, methanol, and H 2 And liquid fuel, etc., play a very important position in my country's energy strategy. [0003] At present, industrialized coal gasification devices mainly include three types: fixed bed, fluidized bed and entrained bed gasifier. These gasification processes have their disadvantages and scope of application: (1) Entrained bed gasification furnace is a gasification process with rapid d...

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Problems solved by technology

These gasification processes have their disadvantages and scope of application: (1) Entrained bed gasification furnace is a gasification process with rapid development at present. It is characterized by high carbon conversion rate, cold gas efficiency and thermal efficiency compared with other gasification processes. It has high technology and is suitable for large-scale production. The largest single gasifier can process 2,000-3,000 tons of coal per day; but because it is liquid slag discharge, it is only suitable for coal with ash melting point less than 1,400 degrees. Coal with ash and high ash melting point is also not suitable; in addition, the oxygen consumption of gasification is higher than other processes; (2) The advantage of fixed bed gasifier is that the unit energy consumption is relatively small, and it has a wide range of adaptability to coal types. The thermal efficiency is high; however, the fixed bed gasification process has strict requirements on the coal particle size, which is only suitable for the gasification of weakly cohesive lump coal or briquette coal, and in order to prevent slagging, the operating temperature is low and the amount of water steam Larger, the by-product tar and phenol are difficult to handle; in addition, due to its low gasification intensity, the large-scale is limited; (3) The fluidized bed gasifier is characterized by relatively wide adaptability to coal types, Including coal types with high ash, low calorific value and high ash melting point, the gasification process has low oxygen consumption, which is suitable for air gasification and oxygen-enriched gasification; the current problem is: KRW, which has good adaptability to coal types and has been industrialized and U-Gas furnaces are limited in scale-up performance; pressurized bubbling fluidized bed (such as HTW) and circulating fluidized bed gasifier have been successfully scaled up to 740 tons of coal per day, when both are only suitable for sticky coal

The existing gasification process cannot be directly applied to the gasification of high-sulfur, high-ash, and high-ash melting point coal with abundant reserves in my country. Therefore, it is urgent to develop a gasification process that has wide adaptability to coal types and is especially suitable for processing high-sulfur, high-ash coal with abundant reserves in my country. Ash, high ash melting point coal, and advanced gasification technology with high carbon conversion rate, high calorific value of gas, low investment and superior environmental protection performance in the gasification process

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