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Systems and methods for pyrolysis of carbonaceous solid fuels

A technology of solid fuel and solid heat carrier, which is applied in the direction of direct heating dry distillation, special form dry distillation, petroleum industry, etc. It can solve the problems of large circulation volume, low partial pressure of tar, and low calorific value of baked gas, so as to reduce operation difficulty and improve Yield effect

Active Publication Date: 2016-12-21
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the heating method of the gas heat carrier requires a high circulation ratio of the gas, a large wind power supply is required. At the same time, the gas heat carrier contains a large amount of inert gas, and these inert gases will also enter the dryer and pyrolysis device. As a result, the calorific value of the gas heat carrier is low and it is difficult to ensure its combustion stability, which in turn leads to a low calorific value of the furnace gas; after the pyrolysis is completed, the gas heat carrier will enter the tar recovery unit with the tar, but due to the gas heat The presence of a large amount of inert gas in the carrier causes the partial pressure of tar to be low and thus the recovery rate of tar is low
[0005] The solid heat carrier heating method overcomes the disadvantages of the gas heat carrier, but there are new problems. Due to the large circulation of the solid heat carrier, it is difficult to adjust the operating conditions of the pyrolysis device simply relying on the solid heat carrier for heating; moreover, due to the lack of The purge effect of the gas carrier, the gaseous product stays in the pyrolysis device for a long time, and the tar is prone to secondary reactions, resulting in a decrease in the tar yield

Method used

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  • Systems and methods for pyrolysis of carbonaceous solid fuels
  • Systems and methods for pyrolysis of carbonaceous solid fuels
  • Systems and methods for pyrolysis of carbonaceous solid fuels

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The solid heat carrier used is alumina particles with a particle size of less than 2mm. The temperature when entering the mixer is 700°C, the specific heat is 1.91kJ / kg.°C, and the flow rate is 220000kg / h. The gas heat carrier used comes from the burner and The temperature is 800°C, the specific heat is 1.71kJ / kg.°C, the solid heat carrier provides 85% of the heat for the pyrolysis reaction, and the gas heat carrier provides 15% of the heat for the pyrolysis reaction. The dry coal is pyrolyzed at 530°C to form semi-coke, tar and medium calorific value gas. The flow rates of various products are shown in Table 2 and the yields are shown in Table 3.

Embodiment 2

[0054] The solid heat carrier used is alumina particles with a particle size of less than 2mm. When entering the mixer, the temperature is 700°C, the specific heat is 1.91kJ / kg.°C, the flow rate is 240000kg / h, and the temperature of the gas heat carrier is 700°C. The specific heat is 1.76kJ / kg.℃, the solid heat carrier provides 90% of the heat for the pyrolysis reaction, and the gas heat carrier provides 10% of the heat for the pyrolysis reaction. The dry coal is pyrolyzed at 530°C to form semi-coke, tar and medium calorific value gas. The flow rate is shown in Table 2 and the yield is shown in Table 3.

Embodiment 3

[0056] The solid heat carrier used is alumina particles with a particle size of less than 2mm. The temperature when entering the mixer is 700°C, the specific heat is 1.91kJ / kg.°C, and the flow rate is 180000kg / h. The gas heat carrier used comes from the burner and the temperature The temperature is 800°C, the specific heat is 1.62kJ / kg.°C, the solid heat carrier provides 70% of the heat for the pyrolysis reaction, and the gas heat carrier provides 30% of the heat for the pyrolysis reaction. The dry coal is pyrolyzed at 530°C to form semi-coke, tar and medium calorific value gas. The flow rate is shown in Table 2 and the yield is shown in Table 3.

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Abstract

The invention provides a system and a method for pyrolysis of a carbon-containing solid fuel. The system includes a pyrolysis device; in the pyrolysis device, the carbon-containing solid fuel is pyrolyzed to produce crude pyrolysis gas and a solid product by utilizing heat quantity of a solid heat carrier and heat quantity of a gas heat carrier, and the introduction amounts of the solid heat carrier and the gas heat carrier are determined in the way that the heat quantity of the solid heat carrier and the heat quantity of the gas heat carrier cannot be enough to alone supply whole heat quantity required by pyrolysis of the carbon-containing solid fuel. The system also includes a solid product recovery unit, a liquid product recovery unit and a heat carrier supply unit, and the heat carrier supply unit is communicated with the pyrolysis device and outputs the gas heat carrier and the solid heat carrier to the pyrolysis device. The system and the method for pyrolysis of the carbon-containing solid fuel adopt the solid heat carrier and the gas heat carrier to together supply heat for the pyrolysis reaction, and thus on one hand, the improvement of the liquid product yield is facilitated, and on the other hand, the operation difficulty of the system is reduced.

Description

technical field [0001] The invention relates to the field of pyrolysis of carbon-containing solid fuels, in particular to an internal thermal pyrolysis system and a method thereof. Background technique [0002] With the increasing scarcity of petroleum resources, in order to ensure the energy demand of modern industry, people gradually turn their attention to coal, an alternative energy source for petroleum. At present, coal pyrolysis method is a research hotspot in the field of coal chemical industry. Coal pyrolysis refers to the process of thermally decomposing coal in an isolated air or inert atmosphere to produce gaseous gas, liquid tar and solid semi-coke. The main components of gas include H 2 , CO, CO 2 and CH 4 , semi-coke is used as a fuel with less water content and higher calorific value, and tar can be processed to extract high value-added fine chemicals. [0003] The internal heat pyrolysis method usually uses a gas heat carrier or a solid heat carrier to su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/00C10B49/02C10B49/16C10B57/00
Inventor 翁力崔哲李初福赵香龙刘科
Owner CHNA ENERGY INVESTMENT CORP LTD