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Method for preventing generating ash erosion in process of gasifying low ash fusion point biomass in fixed bed

A technology for a fixed bed gasifier and biomass raw materials, which is applied in the energy field, can solve the problems of increasing investment costs and being difficult to widely use, and achieves the effects of preventing slagging in the furnace, having great promotion prospects and having remarkable effects.

Active Publication Date: 2015-05-27
高邮市林源科技开发有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of high-temperature-resistant, wear-resistant, anti-slagging materials and thermal insulation materials, the investment cost is greatly increased, which makes the promotion of this technology difficult and difficult to be widely used in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Water vapor is obtained by using gasification waste water as the water source and coal gas sensible heat as the heat source, and the gasification agent for biomass gasification is a mixed gas with a volume ratio of air and water vapor of 6:1, and the temperature of the fixed bed oxide layer is 1125°C , which is lower than the melting temperature of 1160°C of the biomass ash used in the present invention. The slagging problem in the fixed-bed gasifier is effectively alleviated, and the efficient, stable and long-term operation of the gasifier and its auxiliary equipment is ensured. At the same time, the gasification efficiency of the gasifier is not affected in any way, and the heat utilization efficiency of the whole device is greatly improved due to the sensible heat recycling of the coal gas. Using gasification wastewater as the water source of water vapor can not only reduce the cost of sewage treatment, but also be beneficial to environmental protection.

Embodiment 2

[0024] The specific scheme is as shown in Example 1, except that the volume ratio of air and water vapor is changed to a mixed gas of 8:1. At this time, the temperature of the fixed bed oxide layer is 1100°C.

Embodiment 3

[0026] The specific scheme is as shown in Example 1, except that the volume ratio of air and water vapor is changed to a 5:1 mixed gas, and the temperature of the fixed-bed oxide layer is 1130°C.

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PUM

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Abstract

The invention provides a method for preventing generating ash erosion in a process of gasifying a low ash fusion point biomass in a fixed bed. Gasified wastewater is used as a water source and gas sensible heat is used as a heat source to obtain water vapor, a mixed gas obtained by mixing the water vapor and air is used as a gasifying agent for gasifying the biomass, the mixed gas gasifying agent is capable of reducing the temperature of an oxidization layer of the fixed bed to below the fusion temperature of the biomass ash, thus the ash erosion in a gasifying furnace is effectively released, and the gasifying furnace is ensured to efficiently and stably operate. The method has the advantages of simple and reasonable operation, energy saving and environment protection without generating additional investment cost, and has huge popularization prospect.

Description

technical field [0001] The invention relates to a method in the field of energy technology, in particular to a method for effectively preventing slagging in a fixed-bed gasifier with low ash melting point and biomass raw materials. Background technique [0002] Biomass is a clean and renewable resource with wide distribution and abundant resources, and its energy utilization process can realize CO 2 zero emission. my country has very rich biomass resources. The development of biomass gasification technology can alleviate the current and future shortage of fossil energy and reduce greenhouse gas emissions. At the same time, it is of great significance to solve the problem of rural straw utilization and increase farmers' income. Fixed bed gasification technology has been widely used because of its simple structure, good working stability, low tar content in coal gas, and high calorific value. However, there are still some problems in the application of fixed bed technology t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/16
CPCY02P20/10
Inventor 盛卫东吴幼青吴诗勇高晋升秦世平尉建中
Owner 高邮市林源科技开发有限公司