Process for preparing feed gas for synthetic ammonia by two-stage furnace coal gasification taking cold-pressed briquette as raw material

Abstract

The invention discloses a process for preparing feed gas for synthetic ammonia by two-stage furnace coal gasification taking cold-pressed briquette as raw material. The briquettes after cold extrusion are directly put in a furnace, and then the extruding, the feeding in the furnace and the drying process of the briquettes are continuously finished by adopting a method that the cold-pressed briquettes in the furnace are dried by using the heat of partial air-blowing smoke. Not only the manufacturing process of the briquettes is simplified, but also the manufacturing cost of the briquettes is reduced, and simultaneously, both the strength and the hardness of the cold-pressed briquettes during the process of feeding in the furnace are low, and the difference in dropping height is small, therefore, the process has the advantages of uniform granularity after feeding in the furnace, less crushing quantity, less dust carried from the air blowing smoke, less loss amount of the briquettes, low coal consumption, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the improvement of the coal gasification process of the fixed-bed circulation method, in particular to a two-stage furnace coal gasification process for producing raw material gas for ammonia synthesis using cold briquette coal as the raw material. Background technique [0002] There are two main types of fixed bed circulation coal gasification process currently used, one is the intermittent gasification method represented by UGI fixed bed gasifier, and the other is the two-stage furnace circulation gasification method represented by IGI . The traditional UGI and IGI coal gasifier batch gas production process can only use lump coke, anthracite lump coal, and anthracite drying and air-dried briquettes; as the prices of lump coke and anthracite lump coal have doubled, many Small and medium enterprises in ammonia synthesis are forced to use low-priced drying and air-drying briquettes. Generally speaking, cold-extruded briquettes ...

AI Technical Summary

Problems solved by technology

The traditional UGI and IGI coal gasifier batch gas production process can only use lump coke, anthracite lump coal, and anthracite drying and air-dried briquettes; as the prices of lump coke and anthracite lump coal have doubled, many Small and medium enterprises in ammonia synthesis are forced to use low-priced drying and air-drying briquettes. Generally speaking, cold-extruded briquettes need to be equipped with drying equipment to dry briquettes, and hot-extruded briquettes do not need to be equipped with drying equipment. However, a large area of ​​air-drying sites and facilities are needed to air-dry the briquettes. In contrast, the production cost of cold-extruded briquettes is higher than that of hot-extruded briquettes. However, as labor costs increase exponentially, hot-extruded The original profit margins of briquettes and cold-extruded briquettes not only disappear, but because of abandoning the air-drying method and adopting the drying method, the manufacturing cost of hot-extruded briquettes is higher. How to reduce the manufacturing cost of briquettes is hot-extruded briquettes Common problems in the development process of cold extrusion briquettes

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