Environment-friendly sludge compound briquette fuel and preparation method thereof

A composite molding and environmental-friendly technology, which is applied in the direction of fuel, solid fuel, biofuel, etc., can solve the problems of molding fuel quality and combustion characteristics maintenance, affecting fuel quality and environmental protection performance, and difficult mixing of sludge and conditioner. Achieve the effects of reducing the cost of chemicals, improving the overall combustion reactivity, and reducing costs

Inactive Publication Date: 2014-08-27
广州福之源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these three methods, exogenous conditioning agents such as coal, calcium hypochlorite, and sodium hypochlorite are commonly used to condition the sludge, which not only introduces exogenous chlorine and sulfur, but also increases the total amount of chlorine and sulfur in the fuel. It also increases the amount and types of external binders, sulfur-fixing agents, chlorine-fixing agents, etc., which increases the processing cost and affects the quality and environmental performance of the fuel.
The molding fuel prepared by molding process after drying sludge has better combustion performance, but the cost of deep sludge dehydration is high, which is not economically feasible, and there are still problems in the finished product that are easy to absorb water, incomplete combustion, easy to produce reducing gas, and cause chemical Heat loss and other issues
The wet sludge direct molding technology can directly bypass the most difficult sludge drying process, but in actual operation, there are still many difficulties such as difficult mixing of sludge and conditioner, drying, easy cracking, and low quality.
Sludge semi-dry molding technology can exert the strongest bonding effect of sludge, but its process is mostly complicated, the amount of pretreatment and post-drying treatment is relatively large, and it needs to occupy a large process area. At the same time, the quality of the molding fuel and The combustion characteristics are also difficult to maintain in the later stage of drying, resulting in unstable product performance and restricting its further industrialization

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  • Environment-friendly sludge compound briquette fuel and preparation method thereof

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preparation example Construction

[0022] Preparation method of an environmentally friendly sludge composite briquette fuel

[0023] 1) Sludge dehydration pretreatment: According to the method described in the patent "a method for conditioning and dehydrating sludge with high dryness", the sludge is pretreated to make the moisture content 50-65%;

[0024] 2) Conditioner raw material pretreatment:

[0025] Raw material (1): Biomass powder: at least one of wood chips and straw powder, made by crushing branches and straw to a particle size of less than 0.05mm;

[0026] Raw material (2): shell powder: obtained by crushing discarded shells such as oyster shells, scallops, and clams to a fineness of more than 35 mesh;

[0027] Raw material (3): aluminum powder: commercially available, above 400 mesh;

[0028] 3) Preparation of conditioner:

[0029] Mix shell powder and aluminum powder in step 2) evenly according to the mass ratio of 10: (1~3%), then add biomass powder according to 1%~2% of its weight, mix evenly, ...

Embodiment 1

[0034] 1) Sludge dehydration: Sewage plant sludge is selected as the raw material, and the sludge is pretreated according to the method described in the patent "A Method for Conditioning and Dehydrating Sludge with High Dryness", so that the moisture content is 57.2%;

[0035] 2) Conditioner raw material pretreatment:

[0036] Biomass powder is selected from at least one of wood chips and straw powder, which is obtained by crushing branches and straw to a particle size below 0.05mm;

[0037] Shell powder is obtained by crushing discarded shells such as oyster shells, scallops, and clams to a fineness of more than 35 mesh;

[0038] The aluminum powder is commercially available aluminum powder of more than 400 mesh.

[0039] 3) Preparation of conditioner:

[0040] Conditioning agent A: biomass powder;

[0041] Conditioning agent B: a mixture of biomass powder and shell powder, wherein the biomass powder is 1.5% of the weight of shell powder;

[0042] Conditioning agent C: a ...

Embodiment 2

[0069] 1) Dewatering the sludge: select sewage plant sludge as raw material, and pretreat the sludge according to the method described in the patent "A Method for Conditioning and Dehydrating Sludge with High Dryness" to make the moisture content 50%;

[0070] 2) Conditioner raw material pretreatment:

[0071] Biomass powder is selected from at least one of wood chips and straw powder, which is obtained by crushing branches and straw to a particle size below 0.05mm;

[0072] Shell powder is obtained by crushing discarded shells such as oyster shells, scallops, and clams to a fineness of more than 35 mesh;

[0073] The aluminum powder is commercially available aluminum powder of more than 400 mesh.

[0074] 3) Preparation of conditioner: The conditioner is a mixture of biomass powder, shell powder and aluminum powder. After the shell powder and aluminum powder are mixed evenly at a mass ratio of 10:1, 1% of its weight is added to the biomass powder and mixed. Uniform;

[007...

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Abstract

The invention discloses an environment-friendly sludge compound briquette fuel and a preparation method thereof. The method comprises the steps of firstly, carrying out sludge dewatering pretreatment; uniformly mixing shell powder, aluminum powder and biomass powder to obtain a conditioner; then, cutting the dewatered sludge, mixing the dewatered sludge and the conditioner, pressing the mixture to form a granular material, drying, then, immersing the granular material into a layer of waste oil, and airing to obtain the environment-friendly sludge compound briquette fuel. The environment-friendly sludge compound briquette fuel is high in compressive strength larger than 95kPa and drop strength larger than 95% which are both far higher than the mechanical performance of briquette coal; the sulfur and chlorine fixation effects are good and can be respectively up to 85.4% and 87.8%; the calorific value can be up to 5025 kilocalories; the wet strength is up to 54.6kPa, the ignition point is reduced to 240 DEG C, the moisture resistance and waterproofness are remarkably improved, and the inflammability is enhanced; aluminum powder and combusting metal oxides can be subjected to reaction similar to aluminothermic reaction, so that the complete combustion of carbon granules is accelerated, reductive pollution gases are prevented from being generated, and the combustion activity is high; and in addition, the preparation method has the advantages of simplicity in operation, easiness for obtaining raw materials, low cost, little environment pollution and the like.

Description

technical field [0001] The invention relates to an environment-friendly sludge composite molding fuel and a preparation method thereof, belonging to the technical field of waste fuel recycling. Background technique [0002] Sludge fuelization is considered to be one of the most promising methods to replace traditional sludge treatment technology. It is predicted that the amount of sludge fueled in Europe will double in the next 10 years. Sludge fuel utilization technology currently mainly includes two aspects, one is sludge pyrolysis to oil, and the other is the production of sludge synthetic fuel. Among them, the pyrolysis of sludge to oil is difficult to enter the field of industrial application because the oil content is relatively complex and the pyrolysis process cannot be precisely controlled. reflect. However, the technical threshold and input cost of making synthetic fuel from sludge are relatively low, and it is easy to popularize and apply. The prospect of large-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/46
CPCY02E50/30Y02E50/10
Inventor 刘正强
Owner 广州福之源环保科技有限公司
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