Double fluidized bed material circulation control system and control method

Abstract

The invention discloses a double-fluidized-bed material circulation control system and a control method. The system comprises a fluidized bed semi-coke heating furnace, a high-temperature cyclone separator and a fluidized bed pyrolyzing furnace which are connected in sequence, an upper outlet of the fluidized bed semi-coke heating furnace is communicated with an upper inlet of the fluidized bed pyrolyzing furnace; a top outlet of the high-temperature cyclone separator is communicated with the burnout furnace, and a bottom outlet of the high-temperature cyclone separator is connected with the first return feeder; a high-temperature conical valve is arranged on the side surface of the first return feeder and is connected with a first heating furnace inlet in the side wall of the lower part of the fluidized bed semi-coke heating furnace; a top outlet of the first return feeder is communicated with a first pyrolyzing furnace inlet in the side wall of the lower part of the fluidized bed pyrolyzing furnace; and a first high-temperature coke discharge valve is also arranged on the side wall of the lower part of the fluidized bed pyrolyzing furnace, and is connected with a second heating furnace inlet in the side wall of the lower part of the fluidized bed semi-coke heating furnace through a third return feeder. According to the invention, the control method is simple and reliable, and the pyrolysis efficiency and the product yield of the coal can be improved.

Description

technical field [0001] The invention relates to the technical field of coal pyrolysis utilization, in particular to a dual fluidized bed material circulation control system and control method. Background technique [0002] Coal rich in volatile matter (especially low-rank coal) can be converted into semi-coke, gas and tar through pyrolysis, and then liquid fuel or gas can be produced through deep processing, such as hydrogenation of tar to produce steam and diesel etc. to replace liquid fuels, and use gas purification as raw materials for chemical synthesis or gas fuel, etc., thereby alleviating the plight of my country's shortage of oil and gas. [0003] At present, there are many coal pyrolysis processes, typically including solid heat carrier, gas heat carrier and heat carrier-free coal pyrolysis technology, including LR process, Toscoal process, heat and electricity polygeneration technology of Zhejiang University, thermal power technology of Tsinghua University Electric...

AI Technical Summary

Problems solved by technology

At present, a lot of research has been carried out on the coordinated normal operation mechanism between the two reactors and some achievements have been made, but there are still many control problems in practical applications, such as large fluctuations in the operating temperature and pressure of the reactors, control of the amount of heat carrier Difficulty, poor gas and tar quality, etc.

In addition, the use of high-temperature circulating ash as a heat carrier will lead to a high ash content in the semi-coke produced by coal pyrolysis, resulting in a decrease in its quality

These problems have seriously hindered the process of engineering application of the process

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