Preheating type graded gasification method and device

Abstract

The invention provides a preheating type graded gasification method which comprises the following steps: (a) introducing fuel (A) and a first gasifying agent (B) into a front-loading preheating chamber (2), and preheating so as to generate a preheated gas-solid mixture (CD); (b) performing gas-solid separation on the preheated gas-solid mixture (CD) by using a separation device (3) so as to form reductive fume (C) and preheated fuel (D); (c) introducing a second gasifying agent (E) and the preheated fuel (D) into an entrained-flow gasifier (1), and enabling the two components to react to generate a crude coal gas (G) and bottom slag (F); and (d) collecting the reductive fume (C) and the crude coal gas (G), and discharging the bottom slag (F) outside the entrained-flow gasifier (1). The invention further provides a preheating type graded gasification device. By adopting the preheating type graded gasification method and the preheating type graded gasification device provided by the invention, no burner is used, wide coal applicability is achieved, coal can be prepared easily, and product gas is rich in CH4.

Description

technical field [0001] The invention belongs to the technical field of gasification of carbon-containing raw materials, and relates to a gasification method and device for carbon-containing raw materials, in particular to an entrained-bed gasification method and a device adopting the method. Background technique [0002] In the process for producing synthesis gas or gasification gas, carbonaceous feedstock is partially oxidized in a reactor. Taking coal as an example, coal gasification technology is an efficient and clean clean coal technology that converts solid primary energy such as coal into gaseous clean secondary energy. This technology is mainly used in synthetic ammonia, synthetic methanol, hydrogen production, blast furnace reduction, ironmaking and chemical industry Metallurgical industry, combined cycle power plant, industrial and domestic gas and other fields. [0003] Classified according to the movement state of solid fuel, modern coal gasification processes m...

AI Technical Summary

Problems solved by technology

[0004] However, the entrained bed gasifier has the following problems: (1) The burner has a complex structure, and its service life is generally only three months to half a year. It must be replaced regularly, which seriously affects the operation economy, and the burner with a long service life is expensive; (2) The adaptability of the entrained bed gasifier is restricted by factors such as coal ash, moisture, and reactivity; (3) In order to obtain a high reaction rate and carbon conversion rate, the coal powder particle size required to be more than 70% less than 200 mesh, the cost of coal powder preparation is high, and the particle size requirement limits the use of lignite and high ash coal; (4) In order to maintain the high reaction temperature in the furnace, pure oxygen is often used as the oxidant, and the oxygen consumption is high, which affects the economy ; (5) CH in the product gas 4 Low content, not suitable for CH 4 Preparation of synthesis gas with high content requirements

In view of the above problems, the prior art tries to increase the life of the burner by improving the performance of the burner, and increase the methane yield through hydrogenation catalysis. However, improving the performance of the burner cannot fundamentally solve the problems existing in the entrained bed gasifier. Hydrogen catalysis drives up costs

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