Multi-way method for synthesizing ammonia by utilizing low-rank coal

Abstract

The invention provides a multi-way method for synthesizing ammonia by utilizing low-rank coal. The multi-way method comprises the following steps: drying the low-rank coal to obtain dried low-rank coal and waste gas; removing dust from the waste gas to obtain coal powder; gasifying and reducing the dried low-rank coal to obtain an oil-gas mixture and quality-improved coal, wherein a gasification and reduction technology is a chemical reaction technology for heating the dried low-rank coal under an oxygen-free or micro-aerobic condition; purifying the oil-gas mixture to obtain mixed gas and wastewater; reforming and transforming the mixed gas to prepare synthetic gas; preparing coal water slurry through the wastewater, the coal powder and a coal water slurry additive and then preparing synthetic gas; preparing synthetic gas by utilizing the quality-improved coal; after mixing the three types of synthetic gas, carrying out unconventional conversion and transformation and decarburizationand separating and purifying H2; taking the H2 and N2 as raw materials to synthesize the ammonia. According to the multi-way method, a plurality of ways for synthesizing the ammonia are provided and the cost is low; reutilization of various wastes including the wastewater and the coal powder is realized and resources are saved.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method for synthesizing ammonia through multiple channels using low-rank coal. Background technique [0002] Coal processing and conversion industry that uses coal as the main raw material to produce a variety of clean fuels and basic chemical raw materials, specifically including coal-to-oil, coal-to-natural gas, low-rank coal utilization, coal-to-chemicals, and multiple product co-production . It pointed out the development direction for the quality-based utilization of low-rank coal. The moderate development of coal deep processing industry is not only the need of national energy strategic technology reserve and production capacity reserve, but also an important measure to promote the clean and efficient utilization of coal and ensure national energy security, especially for low-rank coal. Coal pyrolysis conversion is the starting point, classif...

AI Technical Summary

Problems solved by technology

However, considering that the water content in low-rank coal is high, and water resources are often very precious in areas rich in low-rank coal; Preparation of coal-water slurry and reuse of coal-water slurry gasification for ammonia synthesis is of great significance to solve the insufficient water recovery and environmental pollution in the existing low-rank coal

Images