Low temperature pyrolysis method of solid fuel in counter flow downer pyrolysis reactor

A technology of pyrolysis reactor and solid fuel, which is applied in the direction of biofuel, direct heating dry distillation, special form dry distillation, etc. It can solve the problems of increasing the complexity of the overall process, difficulty in obtaining semi-coke products, and difficult separation, so as to reduce operation Complexity, extended residence time, effects of fully heated processes

Active Publication Date: 2011-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the solid heat carrier down-going bed or fluidized bed pyrolysis process, the obtained solid product semi-coke and solid heat carrier particles are in a solid-solid mixed state, and the separation is difficult, so the obtained semi-coke is usually sent together with the solid heat carrier The combustion device is used for combustion to generate heat, but it is difficult to obtain semi-coke products. If semi-coke is the target product, a solid-solid separation device needs to be added, which increases the complexity of the overall process.

Method used

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  • Low temperature pyrolysis method of solid fuel in counter flow downer pyrolysis reactor
  • Low temperature pyrolysis method of solid fuel in counter flow downer pyrolysis reactor
  • Low temperature pyrolysis method of solid fuel in counter flow downer pyrolysis reactor

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Embodiment 1

[0032] figure 2 Is the schematic diagram of the process flow of the present embodiment, by figure 2 It can be seen that the method for preparing clean semi-coke, tar, and high calorific value pyrolysis gas by low-temperature pyrolysis of coal in the countercurrent down-flow bed pyrolysis reactor of this embodiment is as follows:

[0033] Put the Huolinhe coal into the coal crushing and drying device, crush and dry it into coal with a diameter of less than 2mm, and after heating up to 120°C, send the coal from the top into the countercurrent descending bed pyrolysis reactor, and use pine wood powder as fuel in the combustion device The heat generated by combustion supplies the heat required for the coal pyrolysis reaction in the countercurrent down-flow bed pyrolysis reactor;

[0034]Coal is fed from the top of the counter-current down-bed pyrolysis reactor, passes through the counter-current down-bed pyrolysis reactor from top to bottom, and is in countercurrent contact wit...

Embodiment 2

[0037] In this embodiment, the same experimental pyrolysis coal solid fuel and experimental method as in Example 1 are adopted, the difference is that the fuel burned in the combustion device is coal, and the pyrolysis temperature is different;

[0038] In this example, the flue gas temperature in the combustion device is controlled at 900°C, the temperature of the semi-coke at the bottom of the countercurrent descending bed pyrolysis reactor is 690°C, and the temperature of the volatile matter outlet at the top of the countercurrent descending bed pyrolysis reactor is 590°C. The semi-coke is obtained in this example The yield is 64wt% of the weight of the coal raw material, the yield of tar is 14wt% of the weight of the coal raw material, and the yield of pyrolysis gas is 10wt% of the weight of the coal raw material.

Embodiment 3

[0040] In this embodiment, the same experimental pyrolysis coal solid fuel and experimental method as in Example 1 are adopted, the difference is that the fuel burned in the combustion device is gas, and the pyrolysis temperature is different;

[0041] In this example, the flue gas temperature in the combustion device is controlled to be 1000°C, the temperature of the semi-coke at the bottom of the countercurrent descending bed pyrolysis reactor is 780°C, and the temperature of the volatile matter outlet at the top of the countercurrent descending bed pyrolysis reactor is 680°C. The yield is 62wt% of the weight of the coal raw material, the yield of tar is 11wt% of the weight of the coal raw material, and the yield of pyrolysis gas is 15wt% of the weight of the coal raw material.

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Abstract

The invention relates to a low temperature pyrolysis method of the solid fuel of a counter flow downer. The method comprises the following steps: solid fuel is filled from the top of the counter flow downer pyrolysis reactor, and the solid fuel passes through the counter flow downer pyrolysis reactor from top to bottom to perform countercurrent contact with the fluidized gas which enters the counter flow downer pyrolysis reactor from the bottom and moves from bottom to top, thus the pyrolytic reaction of the solid fuel can be completed. The solid fuel is coal, biomass or oil shale; and the radiative heat transfer of the wall of the counter flow downer pyrolysis reactor and the heat convection of the fluidized gas provide the main required heat of the pyrolytic reaction of the solid fuel. The invention has the following advantages: the design height of the downer pyrolysis reactor can be reduced, the sulfur content of semicoke is low, the tar yield is high, the pyrolysis gas heat value is high, the operation is continuous and stable, etc.

Description

technical field [0001] The invention belongs to a low-temperature pyrolysis method for solid fuel, in particular to a low-temperature pyrolysis method for solid fuel in a continuously operated countercurrent down-flow bed pyrolysis reactor. Background technique [0002] Coal is not only an energy source, but also an important source of valuable C and H resources and a variety of high-value chemicals. my country is a country rich in coal, low in gas, and poor in oil. Coal is an important pillar of my country's economic development. Therefore, the development of clean and comprehensive utilization methods for coal is an inevitable requirement for my country's energy structure and industrial development. [0003] Biomass energy is a renewable energy, and the development and utilization of biomass energy has important practical and long-term significance for the sustainable development of society. [0004] Oil shale is rich in reserves in my country, and the liquid products obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B49/06C10B53/06C10B53/04C10B53/02
CPCY02E50/14Y02E50/10
Inventor 宋文立林伟刚王泽李俊峰都林李松庚姚建中董鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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