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Compositely circulating high temperature gasifying process for making synthetic gas with biomass

A composite cycle and process method technology, which is applied in the field of composite cycle high temperature gasification technology, can solve the problems of difficulty in crushing biomass raw materials and reduce the amount of production, and achieve the effects of increasing the amount, reducing the amount of CO2 production, and high scalability.

Active Publication Date: 2007-03-21
WUHAN KAIDI ENG TECH RES INST CO LTD
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AI Technical Summary

Problems solved by technology

[0008] One of the objectives of the present invention is to utilize the staged gasification technology combining low-temperature carbonization, separation of carbonized products, carbonization pulverization and high-temperature gasification to solve the problem that the biomass raw material is difficult to be broken into entrained bed when gasifying the biomass raw material in the entrained bed. The problem of particle size is needed; the second object of the present invention is to separate the pyrolysis gas and charcoal produced in the low-temperature carbonization stage, avoid charcoal from being burned in the combustion zone, increase the amount of reducing agent (carbon) in the reduction reaction, and reduce the amount of the system. CO 2 Production amount; the third purpose of the present invention is to utilize syngas recirculation to solve the transportation problem when biomass raw materials enter the entrained bed, avoid as much as possible the synthesis gas being diluted and the problem that the transport gas takes away a large amount of heat when transporting materials, and at the same time satisfy the In the case of entrained bed pneumatic conveying requirements, by controlling the temperature of the recirculated synthesis gas, the temperature of the carbon-containing powdered fuel entering the gasifier is increased, and then the rate and temperature of the reduction reaction are controlled; the fourth purpose of the present invention is to The ash and unreacted residual carbon are returned to the high-temperature gasifier to improve the carbon conversion rate of the system

Method used

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  • Compositely circulating high temperature gasifying process for making synthetic gas with biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Element

[0055] The low calorific value is 11.6MJ / kg, and the ash melting point (FT) is 1250°C. The oxidant 35 uses 95% vol of oxygen to preliminarily crush the biomass raw material and dry the moisture to 5.8% before sending it into the feed bin 2. The biomass entering the low-temperature carbonization device 4 in the feed bin is controlled at 3.87kg / s, and the low-temperature The temperature rise rate of the carbonization device 4 is controlled at 0.1°C / s, the carbonization temperature is controlled at 300°C, and the pressure is controlled at 3.1MPa. 80% (approximately 6.4 MJ / s) of the heat is provided by the syngas recycle 6, which has a temperature of 600°C. The total amount of pyrolysis gas produced by the low-temperature carbonization device 4 is 3.14kg / s, and the main component of the pyrolysis gas is: H 2 7.4%, CO 33.3%, CO 2 14.2%, CH 4 7.4%, H 2 O 28.4%, N 2 1.5%, C n h m 7.8%. The pyrolysis gas enters the burner 14 of the high-tempera...

Embodiment 2

[0057] Still using the cotton stalk used in Example 1 as the biomass raw material, the biomass entering the low-temperature carbonization device 4 from the feed bin 2 is controlled at 3.87kg / s, and the temperature rise rate of the low-temperature carbonization device 4 is controlled at 1° C. / second , the heating temperature is controlled at 500°C, the pressure is controlled at 3.1MPa, and the self-heating heat of the low-temperature carbonization device 4 is controlled to be 30% (about 2.4MJ / s) of the total heat, and the remaining 70% (about 5.6MJ / s) of heat is synthesized The gas recycle 6 is provided, and the temperature of the recycle syngas 6 is 800°C. The main components of pyrolysis gas are: H 2 6.1%, CO 30.8%, CO 2 15.7%, CH 4 7.1%, H 2 O 29.2%, N 2 1.6%, C n h m 9.4%. The pyrolysis gas and the oxidant undergo an incomplete combustion reaction in the combustion zone 14, and the average temperature of the reaction is 1800°C. The charcoal is made into 150μm c...

Embodiment 3

[0059] Still using the cotton stalk used in Example 1 as the biomass raw material, the biomass entering the low-temperature carbonization device 4 from the feed bin 2 is controlled at 3.87kg / s, and the temperature rise rate of the low-temperature carbonization device 4 is controlled at 0.5°C / s , the carbonization temperature is controlled at 400°C, the pressure is controlled at 3.1MPa, the self-heating heat of the low-temperature carbonization device 4 is controlled to be 25% (about 2MJ / s) of the total heat, and the remaining 70% (about 6MJ / s) of heat is regenerated by the syngas Cycle 6 provides, recycle syngas 6 at a temperature of 700°C. The main components of pyrolysis gas are: H 2 7.2%, CO 32.3%, CO 2 15.2%, CH 4 7.2%, H 2 O 28.9%, N 2 1.6%, C n hm 7.5%. The pyrolysis gas and the oxidant undergo an incomplete combustion reaction in the combustion zone 14, and the average temperature of the reaction is 1300°C. Charcoal is made into 30 μm carbon-containing powde...

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Abstract

The compositely circulating high temperature gasifying process for making synthetic gas with biomass includes the steps of low temperature charring, powdering, high temperature gasifying, separating carbon containing clinker, purifying synthetic gas, and circulating utilization of synthetic gas. Biomass material is first pyrolyzed into pyrolyzed gas and charcoal and the pyrolyzed gas is burnt incompletely in the high temperature gasifying furnace to produce gasifying agent and heat; the charcoal is powdered and fed to the reducing area in the high temperature gasifying furnace to produce reduction reaction with the gasifying agent; and the fly ash and residual carbon produced in the purification are returned to the burning area in the high temperature gasifying furnace. The present invention can produce synthetic gas with CO and H2 content up to 72 %, and has gasifying efficiency of 80-84 % and carbon converting rate over 99 %.

Description

technical field [0001] The invention relates to a composite cycle high-temperature gasification process method for producing synthesis gas from biomass, including low-temperature carbonization, carbonization pulverization, high-temperature gasification, separation of carbon-containing ash, purification treatment of synthesis gas, and recycling of synthesis gas. Recycling. The method belongs to the technical field of producing synthesis gas or combustible gas from biomass. The synthesis gas contains CO, H 2 And various mixtures of carbohydrate gases containing carbon, hydrogen, and oxygen. Synthesis gas produced by the invention can be used in gas turbine power generation system, fuel cell, synthetic oil, metallurgy and other systems. Background technique [0002] With the dwindling reserves of traditional fossil energy (coal, oil, natural gas) and the environmental pollution caused by the use of fossil energy, which directly threatens the survival and development of human...

Claims

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Application Information

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IPC IPC(8): C10B53/02
CPCY02E50/14Y02E50/10
Inventor 张超张泽林冲杨占春李宏宋侃金沙杨吕锋杰
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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