Method and device for preparing synthesis gas by coal particle/oxygen carrier chemical chain

Abstract

The invention belongs to the technical field of clean and efficient utilization of coal and relates to a novel process and a device for producing synthesis gas by coal, in particular to a method and a device for preparing synthesis gas by a coal particle/oxygen carrier chemical chain. In the method, double chemical chain is used to prepare the synthesis gas, the oxygen carrier undergoes a reduction reaction with the coal particles in an oxygen carrier gasifier and an oxidation reaction with air in an air reactor, and the synthesis gas is prepared by the cycle reaction of the oxygen carrier; the purification of the synthesis gas and the collection of CO2 are completed by using a CaCO3/CaO chemical chain; in the preparation of the synthesis gas by combined CaSO4/CaCO3 oxygen chemical chain,the purification and CO2 collection by using the CaCO3/CaO chemical chain are coupled in the preparation process of the synthesis gas by the oxygen carrier chemical chain; therefore, the preparation of the synthesis gas and the preparation of the two chemical chains for the purification of the synthesis gas and the CO2 collection are processed synchronously. The device has a simple structure and is based on a reliable principle; the energy utilization rate of the device is high; the gas prepared by the device has high quality; and the device causes little environmental pollution.

Description

Technical field: [0001] The invention belongs to the technical field of clean and efficient utilization of coal, and relates to a novel process and device for preparing synthesis gas from coal, in particular to a method and device for preparing synthesis gas by coal particle / oxygen carrier chemical chain. Background technique: [0002] The preparation of synthesis gas through coal gasification is one of the clean utilization technologies of coal. The process of preparing synthesis gas from coal is to react coal with a certain amount of oxygen in a high-temperature furnace to generate mainly H 2 , CO and other gases, the generated synthesis gas can be used to burn power, synthesize a variety of chemicals and liquid fuels, etc. Traditional coal gasification technology mainly uses air, water vapor, etc. as gasification agent. In order to reduce N in the product gas 2 and CO 2 In front of the gasification device, the air separation unit (ASU) needs to be used to obtain oxygen...

AI Technical Summary

Problems solved by technology

Traditional coal gasification to produce syngas needs to provide oxygen-enriched gas, and the CO in the syngas 2 The separation is complicated, and the chemical chain technology provides a new idea for coal-to-synthesis gas. The combined oxygen in the oxygen carrier is used to replace the free oxygen in the air, and the air separation unit is omitted. The oxygen carrier reduced in the gasifier is The air is re-oxidized and recycled; using CaCO 3 / CaO cycle can achieve CO 2 The separation of synthetic gas by chemical chain oxygen carrier has great advantages compared with the traditional coal gasification method, but the current technology is still difficult to achieve the effect of completely overcoming the shortcomings of traditional technology; seek an ideal chemical chain oxygen carrier The method of producing synthesis gas from coal can not only improve the existing coal-to-synthesis gas process, but also develop and combine new processes

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