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Straw densification briquetting fuel preparation method for biomass power generation and boiler combustion

A biomass power generation and briquette fuel technology, applied in the direction of biofuel, waste fuel, fuel, etc., can solve the problems of easy coking, corrosion, low ash melting point, etc., and achieve the effect of improving combustion performance, increasing ash melting point, and increasing calorific value

Inactive Publication Date: 2010-07-07
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

[0006] [Purpose of the present invention] The purpose of the present invention is to provide a method for preparing briquette fuel for biomass power generation and boiler combustion in view of the low melting point of straw direct combustion ash, which causes easy coking and corrosion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Straw pretreatment: cut the straw into 1-10cm, steam explosion treatment under the conditions of steam explosion pressure of 0.5MPa and pressure maintenance time of 6min; adjust the solid-liquid ratio of the steam-exploded straw at 35°C and add water (W / W) is 1:8, the cellulase dosage is 15FPA / g dry substrate under the condition of enzymolysis 2d, and enzymolysis straw residue is used for compression molding to prepare solid fuel;

[0013] (2) Compression molding: use a screw extruder to compress and mold the enzymatically hydrolyzed straw slag, forming fuel with a calorific value of 19.2MJ / kg, a water content of 8%, and an ash melting point of 1105°C.

Embodiment 2

[0015] (1) Straw pretreatment: cut the straw into 4-6cm long, treat it with 0.1% (W / W) sulfuric acid, the treatment temperature is 110°C, the time is 3h, and the solid-liquid ratio (W / W) is 1:7 ; Enzymolyze the straw treated with dilute acid at 45°C, add water to adjust the solid-to-liquid ratio (W / W) to 1:10, and use 10 FPA / g dry substrate for enzymatic hydrolysis for 3 days. Preparation of solid fuel by compression molding;

[0016] (2) Compression molding: the enzymatically hydrolyzed straw slag is compressed and molded by a piston punching machine to prepare solid fuel. The prepared solid fuel has a calorific value of 18.6MJ / kg, a water content of 5%, and an ash melting point of 1100°C.

Embodiment 3

[0018] (1) Straw pretreatment: cut the straw into 3-8cm, steam explosion treatment under the conditions of steam explosion pressure of 1.5MPa and pressure maintenance time of 5min; adjust the solid-liquid ratio of the steam-exploded straw at 50°C and add water (W / W) is 1:10, the cellulase dosage is 20FPA / g dry substrate under the condition of enzymolysis 2d, enzymolysis straw residue is used for compression molding to prepare solid fuel;

[0019] (2) Compression molding: use a screw extruder to mix and compress the enzymatically hydrolyzed straw slag and coal at a ratio of 5:1 (W / W), forming a calorific value of 22.1MJ / kg and a water content of 10%. The ash melting point is 1145°C solid briquette fuel.

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Abstract

The invention provides a straw densification briquetting fuel (SDBF) preparation method for biomass power generation and boiler combustion, solving problems of low ash fusion point, easily coking, serious corrosion to boilers and the like of direct straw combustion. In the invention, straw is pre-processed through steam explosion or with diluted acid then is subjected to enzyme hydrolysis with cellulose, and the enzyme hydrolysis residue is briquetted to be used as fuel for biomass power generation or boiler combustion. The pre-processed and enzyme-hydrolysis straw can be briquetted easily; cellulose and hemicellulose in the pre-processed and enzyme-hydrolysis straw are removed basically, lignin content and calorific value increase, potassium ion, sodion and chloridion are removed, thereby improving ash fusion point of straw, reducing coking and boiler corrosion in combustion process, and improving combustion performance of straw. The straw solid fuel prepared by the invention can be used as fuel for common domestic boilers. Sugar produced by enzymolysis can be used as a fermentation carbon source for large-amount fermented products, so as to improve comprehensive utilization value of straw.

Description

technical field [0001] The invention belongs to the field of high-value utilization of straw, in particular to a method for preparing briquette fuel for biomass power generation and boiler combustion. technical background [0002] As the governments of various countries attach great importance to energy conservation and emission reduction and the introduction of a series of measures, straw combustion power generation technology is gradually industrialized. In my country, the State Grid Corporation's National Bio-Power Generation Group Co., Ltd. took the lead in realizing industrialization in 2006. Dozens of straw power plants have been established across the country, and Guodian Longyuan Power Technology Engineering Co., Ltd. has also established three straw power plants. Due to the low ash melting point of direct combustion of straw for power generation, it is easy to coke and corrode, that is, the temperature of the boiler combustion chamber can reach above 1000°C. Polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/44C12P19/14C12P7/10C12P7/16
CPCY02E50/30Y02E50/16Y02E50/10
Inventor 陈洪章彭小伟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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