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Low-rank Coal Upgrading Technology

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Technical Background

China is rich in coal but short of oil. Proven recoverable reserves of coal are up to 114.5 billion tons and bituminous coal and lignite accounts for 80%. Due to the relative lack of petroleum resources and the rapid development of economy, the demand for high quality liquid energy is stronger for aviation, transportation and military industry and other industries. Since the last century ninety's onwards, China has changed from the petroleum export country to the petroleum import country. The oil demand mainly relying on imports will have a negative impact not only on China's economic development, but also on the national security.

Base on the pyrolysis principle, low-rank coal upgrading technology can extract hydrocarbon oil from coal to ease the country’s oil shortage and achieve oil, gas, heat and electricity cogeneration. It combines the coal low temperature pyrolysis and circulating fluidized bed combustion technology to realize effective, comprehensive utilization of coal through staged conversion and polygeneration integration optimization.

Technology Introduction

Low-rank coal upgrading technology R&D received powerful technology support from Tangshan Leadhorse Energy Technology Equipment Co., Ltd, Beijing Leadhorse Greener Energy Technology Co., Ltd, Institute of Process Engineering, Chinese Academy of Sciences and University of Science of Technology Beijing, etc. The technology effectively utilizes low-rank crushed coal (lignite, bituminous coal, etc) as feedstock to achieve oil, gas, heat and electricity cogeneration. The pyrolysis products contain high added value liquid product, especially ketone, phenol and hydrocarbon with carbon numbers in 7~20 difficultly to synthesize directly, medium calorific value pyrolysis gas as civil clean fuel and char for heating and power generation. Thus, the technology is in accordance with the characteristics of China resources, not only increases the overall efficiency of coal conversion and reduces the discharge of pollutants, but also improves product quality.

 

Technical Advantages

  • Particle size <10mm, low-rank crushed coal( lignite, bituminous coal, etc) as feedstock; Compared with vertical retort furnace using lump coal, the low-rank crushed coal price is low;
  • Pyrolysis tar yield is high ( >10%,wt);
  • Stable and easy operation.

Typical Products yield

Sub-bituminous coal as feedstock, product yield:

(Products)

(Gas)

(Char)

(Tar)

(Yield)

0.138Nm3·kg-1
(6800kcal·Nm-3)

0.67kg·kg-1

0.105kg·kg-1

Lignite as feedstock, product yield:

(Products)

(Gas)

(Char)

(Tar)

(Yield)

0.163Nm3·kg-1
(7200kcal·Nm-3)

0.57kg·kg-1

0.156kg·kg-1

 

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