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A method and product for simultaneously preparing solid fuel by removing moisture from sludge

A technology for solid fuel and sludge, which is applied in the direction of solid fuel, sludge detoxification, water/sludge/sewage treatment, etc., can solve the problems of increasing the sensible heat of conditioning sludge, taking up a large area, and having no practical usability.

Active Publication Date: 2020-10-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dehydration first and then mixing additives, it is difficult to make the additive particles evenly distributed in actual operation, and the tempering effect becomes poor; and mechanically dewatering the sludge before conditioning, the original sludge sticking phenomenon is obvious, and the dehydration equipment needs to be cleaned regularly
[0008] (2) The thermal conditioning process of sludge pretreatment, whether it is high temperature or low temperature thermal conditioning, will significantly increase the sensible heat of the conditioning sludge, and the free loss of available heat carried by the sludge will not be utilized, increasing the energy consumption of the sludge treatment and disposal process
[0010] (4) Skip the thermal drying link, and the direct energy utilization of sludge products with high moisture content has many problems such as easy cracking and low quality of sludge in actual operation, and is not conducive to the high value of sludge such as incineration and pyrolysis. Utilization: natural drying, long cycle, low processing capacity, large floor area, easy to cause secondary pollution, and not practically usable

Method used

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  • A method and product for simultaneously preparing solid fuel by removing moisture from sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Heat conditioning: take paper mill sludge with a water content of 99%, and conduct microwave heat conditioning at 50° C. for 1.5 min. The sludge flows out from the thermal conditioning outlet and enters the sludge thermal drying area to dissipate heat.

[0041] Preparation of conditioner: select kitchen waste shrimp and crab shells, agricultural waste straw and rice bran, pass through a pulverizer, and pulverize to a powder with a characteristic length of less than 0.5 mm. Prepare conditioner A: shrimp and crab shell powder; conditioner B: straw powder; conditioner C: mixture of shrimp and crab shells and rice bran at a mass ratio of 3:1; conditioner D: dry sludge.

[0042] Carbon-increasing conditioning: add conditioning agents A, B, C, and D to the heat-conditioned sludge respectively, with a total dosage of 10% of the dry weight of the sludge, stir and mix evenly, and react for 10 minutes to obtain conditioned sludge.

[0043] Heat drying: After dehydration by plate...

Embodiment 2

[0050] Thermal conditioning: take municipal sludge with a moisture content of 90%, and perform electric heating thermal conditioning for 15 minutes. The electric heating temperature was kept at 70°C, 160°C, and 180°C respectively to obtain thermally conditioned sludge A, B, and C. The hot sludge is used as an indirect heat source to supply heat to the sludge thermal drying area for 25 minutes to obtain cold sludge after heat dissipation.

[0051] Preparation of conditioner: select lignite, kitchen waste eggshells, and agricultural waste rice bran to pass through a pulverizer and pulverize to a powder with a characteristic length of less than 2mm. The conditioning agent is obtained by uniformly mixing eggshells, rice bran and lignite pulverized coal at a mass ratio of 3:1.1:4.

[0052] Carbon-increasing conditioning: add a conditioning agent to the cold sludge after heat dissipation, the total dosage is 80% of the dry weight of the sludge, stir and mix evenly and react for 15 ...

Embodiment 3

[0059] Thermal conditioning: Take municipal sludge with a moisture content of 95%, pretreat it at 130°C for 35 minutes, and heat it with solar heat collection system and compensate with electric heating. The sludge flows out from the thermal conditioning outlet and enters the sludge thermal drying zone to cool down to 90-100°C cold sludge.

[0060] Preparation of conditioning agent: Take bagasse, sawdust, and low-quality coal and pass them through a pulverizer respectively, and pulverize them until the characteristic length is less than 1mm. Prepare conditioner A: a mixture of wood chips and bituminous coal in a mass ratio of 3:2; conditioner B: a mixture of bagasse and bituminous coal in a mass ratio of 3:2; conditioner C: bagasse, wood particles, and bituminous coal A mixture of pulverized coal with a mass ratio of 2:1:2.

[0061] Carbon-increasing conditioning: add conditioners A, B, and C to the heat-conditioned sludge respectively, with a total dosage of 30% of the dry w...

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Abstract

The invention provides a method simultaneously for moisture removal and solid fuel preparation from sludge. The method comprises the following steps: step S01: subjecting wet sludge to pretreatment under heating so as to obtain heat conditioned sludge; step S02: cooling the heat conditioned sludge so as to obtain cold sludge, adding a carburetting conditioning agent into the cold sludge, and carrying out uniform mixing so as to obtain carburetted conditioned sludge; step S03: subjecting the carburetted conditioned sludge to dehydration treatment; and step S04: subjecting the dehydrated carburetted conditioned sludge to heat drying so as to obtain a solid sludge fuel. Through combined application of a heat conditioning process and a conditioned sludge sensible heat direct utilization systemin pretreatment of the sludge, the method provided by the invention avoids the problem of excessively high energy consumption, and integrates advantages like improvement of sulfur-fixing, chlorine-fixing, nitrogen-fixing and phosphorus-fixing abilities of modified heat-conditioned sludge and reduction of the content of bound water in a reasonable energy consumption range.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and specifically relates to a method and product for preparing solid fuel while removing water. Background technique [0002] Sludge is an accompanying organism of sewage treatment. Its composition is complex. In addition to a large amount of water, it also contains unstable and easily decomposed inorganic organic matter, toxic pollutants, harmful pathogens and other substances that threaten human health. With the development of the economy and the process of urbanization, the total amount of sewage discharge and sewage treatment in the country has increased year by year, and the sludge production has also increased significantly. Realizing the reduction, stabilization, harmlessness and recycling of sludge is an important development direction of sludge treatment technology. [0003] In recent years, sludge resource utilization technology has developed rapidly, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/13C02F11/00C10L5/46C10L5/44C10L5/02C02F103/28
CPCC02F11/004C02F11/12C02F11/122C02F11/18C02F2103/001C02F2103/28C10L5/02C10L5/442C10L5/445C10L5/46Y02E50/10Y02E50/30
Inventor 刘欢邓红苹胡红云李海燕汪家兴姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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