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Method for preparing semicoke, empyreumatic oil and coal gas by pyrolyzing coal

A technology of coal pyrolysis and semi-coke, which is applied in coke cooling, coke oven, petroleum industry, etc., can solve the problems of difficulty in meeting industrial and civil requirements, unstable product quality, high price, etc., to ensure maximum utilization rate and guarantee Extensive adaptability and strong adaptability to raw materials

Inactive Publication Date: 2011-04-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems existing in the internal heating type vertical carbonization furnace are: ① Since the gas heat carrier must pass through the material layer from bottom to top, the material layer is required to have sufficient air permeability and make the air flow evenly distributed, so the input material should be a block with a particle size of 20-80mm Coal needs to be crushed and screened from raw coal, its yield is not high, and its price is higher than that of raw coal; ②The gas heat carrier contains a large amount of inert gas, resulting in low calorific value of the fired gas, which is difficult to meet industrial and civil requirements. Utilization has a huge impact; ③The water seal cooling method is adopted, and the product moisture content is high, which limits the use of semi-coke products, and additional gas is consumed for drying semi-coke; ④The coal material enters the carbonization chamber from the top of the furnace to the outlet The coke needs to stay for 4-7 hours, the output of a single furnace is low, and the unit investment per ton of coke is high
The temperature inside the furnace is not uniform, and the product quality is unstable; ⑤The coal carbonization furnace is small in scale and difficult to enlarge

Method used

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  • Method for preparing semicoke, empyreumatic oil and coal gas by pyrolyzing coal
  • Method for preparing semicoke, empyreumatic oil and coal gas by pyrolyzing coal
  • Method for preparing semicoke, empyreumatic oil and coal gas by pyrolyzing coal

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Experimental program
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Effect test

Embodiment 1

[0026] As shown in the figure, the raw coal is fed into the mixer 2 from the raw material storage tank 1 through the feeder, mixed with the high-temperature solid heat carrier circulated from the heat carrier warehouse 7, and the temperature rises rapidly, and then the heat carrier and the coal enter the lower heat sink together. Solution Reactor 3.

[0027] The heat carrier and coal move slowly downwards in the pyrolysis reactor 3 under the control of the material level control system. At the same time, the coal undergoes pyrolysis reaction here to generate solid semi-coke and volatile pyrolysis gas products (the main component of the gas is H 2 , CO, CO 2 、CH 4 , water vapor and tar vapor, etc.). The gaseous products are drawn off via the pyrolysis gas channel 10 on the pyrolysis reactor. The heat carrier and semi-coke enter the solid classification separator 4 from the bottom of the reactor.

[0028] The solid fractionation separator 4 separates materials of different s...

Embodiment 2

[0032]As shown in the attached figure, in the atmospheric pressure experimental device, the raw material is lignite, the particle size is less than 10mm, and its dry ash-free element mass composition is: C 72.2%, H 5.6%, O 21.1%, N 1.0%, S 0.1% . The solid heat carrier used is natural olivine with a particle size of 0.4-1.5mm. The temperature of the pyrolysis reactor was controlled at 550°C, the temperature of the riser combustion reactor was 800°C, and the mass ratio of solid heat carrier to coal was 1:1. The data of product composition and yield are shown in Table 1.

Embodiment 3

[0034] As shown in the attached figure, in the atmospheric pressure experimental device, the raw material is lignite, the particle size is less than 50mm, and its dry ash-free element mass composition is: C 72.2%, H 5.6%, O 21.1%, N 1.0%, S 0.1% . The solid heat carrier used is natural olivine with a particle size of 1.5-3.0mm. The temperature of the pyrolysis reactor was controlled at 700°C, the temperature of the riser combustion reactor at 900°C, and the mass ratio of solid heat carrier to coal was 4:1. The data of product composition and yield are shown in Table 1.

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Abstract

The invention discloses a method for preparing semicoke, empyreumatic oil and coal gas by pyrolyzing coal. The method is characterized in that a heating mode of solid thermal carriers is adopted in the pyrolysis process; the semicoke generated in the pyrolysis process and large-particle semicoke in a heat carrier mixture are separated as products by a size grading method, and the empyreumatic oiland coal gas with a medium heat value are produced as byproducts, wherein a pyrolysis system mainly comprises a heat carrier storage bin, a mixer, a pyrolysis reactor, a solid grading separator and araising pipe burning reactor. In the invention, the heating rate of coal is improved, the destructive distillation time is shortened, the single burner production capacity is improved, and the coal of combination grain is taken as production raw materials, the raw material adaptability and the utilization factor are high and the method provided by the invention is suitable for various lignite andbitumite.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and relates to a method for producing semi-coke, tar and gas by pyrolysis of coal, especially a method for producing semi-coke by pyrolysis of young coal, and simultaneously producing low-temperature tar and medium calorific value gas method. Background technique [0002] Lignite or young bituminous coal is pyrolyzed at low temperature (500-750°C) in the absence of air to produce semi-coke, tar and gas. The semi-coke obtained from the above-mentioned raw material coal with low ash and low sulfur is commonly known as semi-coke. Due to its high fixed carbon, high specific resistance, high chemical activity, low ash content, low sulfur and low phosphorus characteristics, semi-coke is widely used in calcium carbide, ferroalloy and other fields. [0003] The existing semi-coke production mainly adopts the internal heating type vertical carbonization furnace, which was invented in China, t...

Claims

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Application Information

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IPC IPC(8): C10B53/00C10B49/16C10B57/00C10B39/04C10B53/02
CPCY02E50/14Y02E50/10Y02P20/129
Inventor 徐绍平邹文俊宋聪聪亚力昆江吐尔逊
Owner DALIAN UNIV OF TECH
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