A large-scale low-rank pulverized coal low-temperature pyrolysis device and method

Abstract

The invention discloses a device and method for large-scale low-temperature pyrolysis of low-rank coal powder. A discharge opening of a vertical preheater is connected with a feed screw; the feed screw is connected with a pyrolysis kiln; a pyrolysis gas outlet of the pyrolysis kiln is connected with a settling connection box; the settling connection box is connected with a high-temperature filter device; a semicoke outlet of the pyrolysis kiln is connected with a semicoke cooling and waste heat recovering device; a steam outlet of the semicoke cooling and waste heat recovering device is connected with a steam pocket; an air outlet of a hot air heating furnace is connected with an air inlet of the pyrolysis kiln; and an exhaust outlet of the pyrolysis kiln is connected with an air inlet of the vertical preheater and an air inlet of the hot air heating furnace. The device is simple in system constitution, reasonable in technological structure, suitable for construction of a large-scale pyrolysis and deep processing production line and high in economic efficiency and environmental protection property.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a large-scale low-rank pulverized coal low-temperature pyrolysis device and method. Background technique [0002] The low-temperature pyrolysis of coal is the most economical and reasonable technical approach to realize the comprehensive and efficient utilization of low-rank coal. Gas, tar and semi-coke with high calorific value can be obtained through pyrolysis. [0003] However, the existing coal low-temperature pyrolysis devices are mostly limited to small-scale production process systems that can only process lump coal, and their environmental protection and economic performance are poor. Other types of low-temperature pyrolysis devices that can process pulverized coal, such as externally heated multi-stage rotary furnaces and solid heat carrier pyrolysis processes, cannot be popularized due to problems such as inability to achieve scale, imperfect p...

AI Technical Summary

Problems solved by technology

The high-temperature pyrolysis gas containing tar gas directly cools and recovers the tar without filtering the particulate matter, resulting in a large amount of impurities in the tar, greatly reducing its quality, and making it difficult for further processing

[0004] Among the existing pulverized coal pyrolysis methods, there are similar multi-tube heating rotary pyrolysis kilns, but they all belong to the process system without an external preheater. High, high failure rate

Moreover, the existing process system is not equipped with complete pyrolysis gas high-temperature filtration, semi-coke cooling and waste heat recovery devices

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