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A method for treating sludge by chemical looping gasification based on copper slag as an oxygen carrier and a device for realizing the method

An oxygen carrier and chemical chain technology, which is applied in the fields of clean fuel gasification, functional materials and environmental protection, can solve the problems of increasing the cost of sludge gasification treatment, secondary pollution, waste of land resources, etc., and is conducive to stable operation. , The purification cost is low, and the effect of ensuring the feeding amount

Active Publication Date: 2020-06-23
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to technical and cost problems, the main sludge treatment method in my country is landfill, which has serious disadvantages such as wasting land resources and causing secondary pollution; and the thermochemical conversion method is because it can effectively realize sludge reduction treatment while recycling Part of the energy in the sludge, reducing secondary pollution, and better embodying the treatment principles of sludge reduction, harmlessness, and resource utilization
[0004] The thermochemical conversion methods of sludge mainly include pyrolysis, gasification, and combustion. Compared with sludge pyrolysis and combustion, sludge gasification has the advantages of low ash leaching toxicity, low emission of gas pollutants, and a wide range of uses for the generated synthesis gas. characteristics, but the traditional sludge gasification method uses air, water vapor, pure oxygen, etc. as the gasification agent, which increases the treatment cost of sludge gasification on the one hand, and also easily generates various gas pollutants (NOx) and sulfide thing

Method used

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  • A method for treating sludge by chemical looping gasification based on copper slag as an oxygen carrier and a device for realizing the method
  • A method for treating sludge by chemical looping gasification based on copper slag as an oxygen carrier and a device for realizing the method
  • A method for treating sludge by chemical looping gasification based on copper slag as an oxygen carrier and a device for realizing the method

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Effect test

Embodiment 1

[0032] 1) Preparation of oxygen carrier and sludge:

[0033] Using the original copper slag provided by Nanjing Iron and Steel Works as the matrix, first crush it, the average particle size is about 1mm; place it evenly in the high-temperature muffle furnace, the accumulation thickness is 15mm, and start from room temperature at 15°C / min Raise to 1100°C and keep the temperature constant for 2 hours. During the calcination process, fresh air is continuously introduced into the furnace to realize air calcination, and then naturally cool to room temperature; take out, crush, sieve (100 mesh), and store to obtain the target oxygen carrier. The elemental analysis of copper slag and copper slag calcined at 1100°C is shown in Table 1. Calcination increases the content of oxygen in the oxygen carrier because of the decomposition reaction of iron silicate (Eq.1). 2Fe 2 SiO 4 +(Sufficient)O 2 →2Fe 2 o 3 +2SiO 2 (Eq.1)

[0034] Table 1. Elemental analysis of original copper slag ...

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Abstract

The invention discloses a method for processing sludge through chemical looping gasification on the basis of adopting cooper slag as an oxygen carrier and a device for implementing the method for processing the sludge through chemical looping gasification on the basis of adopting the cooper slag as the oxygen carrier. According to the method, the chemical looping gasification technology is adopted, the copper slag is used as a precursor, the copper slag is activated to be the oxygen carrier through high-temperature air calcination, and then the domestic sludge is processed with a double-circulation fluidized bed. By the adoption of the method for processing the sludge through chemical looping gasification on the basis of adopting the cooper slag as the oxygen carrier, a utilization magnesium of solid waste is created, the copper slag is recycled, meanwhile reducing, harmless and recycling treatment of the sludge is achieved, waste is treated with waste, a high economical adaptability is achieved, and the method quite meets the environment-friendly new requirement.

Description

Technical field: [0001] The invention belongs to the technical fields of clean fuel gasification, functional materials and environmental protection, and in particular relates to a method for treating sludge by chemical chain gasification based on copper slag as an oxygen carrier and a device for realizing the method. Background technique: [0002] The increase in population and the rapid development of the global economy have led to a large and continuous increase in sludge production in China and the world. The sludge contains a large amount of organic matter such as N, P, bacteria, microorganisms, heavy metals and toxic pollutants. pose a serious threat to the environment. [0003] The current principle of sludge treatment is to realize sludge reduction, resource utilization, and stabilization treatment. The treatment methods mainly include landfill, agricultural utilization, and thermochemical conversion methods. However, due to technical and cost problems, the main slud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/00F23J15/02
CPCF23G7/001F23G2205/121F23G2206/20F23J15/027F23J2217/40
Inventor 何方邓征兵黄振魏国强赵增立
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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