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Drying and gasification process

A technology for hot gas and synthesis gas, which is applied in the manufacture of combustible gas, petroleum industry, combined combustion mitigation, etc., and can solve the problems of low power output, high investment cost of gas engines, and expensive transportation of central power plants.

Inactive Publication Date: 2010-01-27
CORKYS CARBON & COMBUSTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This typically results in larger and more expensive boiler plants and lower heat-to-electricity conversion efficiencies
[0004] 2. Biomass is spread over a vast area, making it extremely expensive to collect and transport to central power plants
[0022] Additionally, the Viking gasifier has a low syngas CV, resulting in a high investment cost per KW for gas engines and low power output for plant scale

Method used

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  • Drying and gasification process
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  • Drying and gasification process

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Example 1 is a plant for the production of thermal biochar as a feed to a conventional coal power plant. see image 3 , which shows a process flow diagram according to one embodiment of the present invention. As can be seen in the figure, the carbonaceous material goes through three process steps, resulting in low-grade syngas.

[0092] In a first step a), the carbonaceous material enters a surface moisture dryer where it comes into contact with hot gas at temperatures between 115°C and 400°C. According to this embodiment, the hot gas is exhaust gas from a power station. In addition to direct contact with the hot gas, surface moisture dryers place the carbonaceous material in indirect contact with the steam flowing through the steam piping inside the dryer. The effect of steam indirect contact with carbonaceous material is to slowly heat carbonaceous material to between 100°C and 140°C, causing the steam to condense and be removed from the surface moisture dryer as l...

Embodiment 2

[0106] In the following examples, fresh leaves and twigs were mechanically picked from the ground. The average collection rate throughout the year is 1.25 tons per hour. This biomass material is sent to a small centralized station where the wood is shredded. The power plant is within 25km of a farm that sustainably provides wood production. The composition of the fuel is:

[0107] Total humidity 50.00% w.b.

[0108] Ash 10.80%d.b.

[0109] Carbon 46.10%d.b.

[0110] Hydrogen 5.90%d.b.

[0111] Nitrogen 0.60% d.b.

[0112] Sulfur 0.20%d.b.

[0113] Oxygen 36.40%d.b.

[0114] Specific energy 18.10MJ / kg d.b (gross number)

[0115] Such biomass, with the composition listed, would typically produce about 0.46MW if it were used in an open cycle power plant e (gross) electricity. This means an overall conversion efficiency of 15%. This is below the economies of scale of an open cycle power plant.

[0116] However, if the same biomass is used as in the process flow diagra...

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Abstract

A process for producing syngas from a carbonaceous substance and / or treating a carbonaceous substance, the process including the following steps: a) reducing the surface moisture of the carbonaceous substance; b) reducing the inherent moisture of the carbonaceous substance; and, c) gasifying the carbonaceous substance to produce syngas, wherein at step a) the carbonaceous substance is directly contacted with a hot gas at a temperature of between 50 DEG C to 250 DEG C, and / or the carbonaceous substance is indirectly contacted with saturated steam at a temperature of between 105 DEG C and 250 DEG C.

Description

technical field [0001] The present invention relates to methods of drying and subsequent gasification of carbonaceous materials, and in particular to methods of utilizing carbonaceous materials having a high water content. Background technique [0002] Recently, the reduction of CO 2 Emissions have become increasingly important globally, especially reducing the CO2 associated with the production of the world's electricity supply, which is currently heavily reliant on coal-fired power plants. 2 emission. Biomass is a renewable energy source that offers a true coal alternative due to its ability to be used for baseload power generation. However, biomass cannot play a significant role in regional or global energy markets for two reasons. [0003] 1. Biomass usually has a very high moisture content of 30-80%. This usually results in larger and more expensive boiler plants and lower heat-to-electricity conversion efficiency. [0004] 2. Biomass is spread over vast lands, mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/00
CPCY02E20/18Y02E20/16
Inventor 大卫·科克
Owner CORKYS CARBON & COMBUSTION
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