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Method for preparing building materials by virtue of sludge pyrolyzation

A sludge and pyrolysis technology, applied in applications, household appliances, ceramic products, etc., can solve the problems of less attention to the utilization of sludge pyrolysis residual coke, high energy consumption cost of sludge composting, and high incineration operation cost, reaching The effect of light weight, saving building energy consumption and good compressive performance

Active Publication Date: 2016-03-09
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest advantage of traditional incineration is that it can minimize the amount of sludge. However, due to the high water content of sludge, the operating cost of incineration is high, and the secondary pollution is serious; sludge landfill requires a large amount of land and is not properly disposed of. It is easy to leak and cause groundwater pollution; the cost of energy consumption for sludge composting is high, and its agricultural use is limited due to safety considerations
Sludge pyrolysis is mainly used for sludge reduction, but in the existing sludge pyrolysis treatment technology, less attention is paid to the utilization of sludge pyrolysis residual coke. This invention proposes an efficient and economical sludge comprehensive Treatment and utilization technology, that is, a method of using sludge pyrolysis to prepare building materials

Method used

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  • Method for preparing building materials by virtue of sludge pyrolyzation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 , a kind of method utilizing sludge pyrolysis to prepare building material, comprises the following steps:

[0026] Step 1, drying the papermaking sludge 1 in a radiant solar dryer 2 until the moisture content is lower than 35%;

[0027] Step 2, the papermaking sludge dried in step 1 is evenly sent to the direct contact drying chamber 3, dried by the flue gas of the system, and sent to the volumetric pyrolyzer 4, the pyrolysis temperature is controlled at 400 °C, and the sludge Combustible gas 11 and sludge charcoal 5 are produced by pyrolysis; combustible gas 12 is sent to the combustion chamber 13 for combustion, and the high-temperature flue gas generated by combustion is sent to the drying chamber 3 to preheat and dry the sludge; the waste gas produced by drying and cooling After the flue gas is sent into the gas purification equipment 14, enters the chimney 15 after purification;

[0028] Step 3, sending the high-temperature sludge charcoal 5 prepare...

Embodiment 2

[0031] Referring to Example 1, this example is a further preferred example of the content of Example 1. Therefore, the method further includes, taking 30-50 parts of papermaking sludge and 20-40 parts of municipal sludge as pyrolysis raw materials, according to The steps in Example 1 were carried out to prepare building materials by pyrolysis.

[0032] A method for preparing building materials by pyrolysis of sludge, comprising the following steps:

[0033] Step 1, 30 parts of papermaking sludge and 40 parts of municipal sludge are placed in a convection solar dryer 2 to dry until the moisture content is lower than 35%;

[0034] Step 2, send the sludge treated in step 1 into the indirect contact dryer 3, dry it with a heat source, and send it to the rotary kiln pyrolyzer 4. The pyrolysis temperature is controlled at 700°C, and the sludge is pyrolyzed to produce combustible gas 12 and sludge charcoal 5; the combustible gas 12 is sent to the combustion chamber 13 for combustion...

Embodiment 3

[0038] Referring to Example 1, this example is a further preferred example of the content of Example 1. Therefore, the method further includes taking municipal sludge as a pyrolysis raw material and performing pyrolysis according to the steps in Example 1 to prepare building materials.

[0039] A method for preparing building materials by pyrolysis of sludge, comprising the following steps:

[0040] Step 1, the municipal sludge 1 is placed in a conductive solar dryer 2 to dry until the moisture content is lower than 35%;

[0041] Step 2: send the sludge treated in step 1 into the indirect contact dryer 3, dry it with a heat source, and send it into the tubular pyrolyzer 4. The pyrolysis temperature is controlled at 600°C, and the sludge is pyrolyzed to produce combustible gas 12 and sludge charcoal 5; the combustible gas 12 is sent into the combustion chamber 13 for combustion, and the high-temperature flue gas generated by the combustion is sent into the indirect contact drye...

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Abstract

The invention relates to a method for preparing building materials by virtue of sludge pyrolyzation. The method comprises the following steps: (1) drying sludge in a solar greenhouse; (2) sending the sludge processed in the step (1) into a drying chamber, drying the sludge by virtue of any heat source (preferable flue gas of a system), sending the sludge into a pyrolyzation chamber, pyrolyzing the sludge so as to produce combustible gas and sludge carbon, introducing combustible gas into a combustion chamber for combustion, introducing high temperature flue gas produced during the combustion into the drying chamber to preheat and dry the sludge, introducing exhaust gas produced during drying and cooled flue gas into gas purifying equipment, and discharging exhaust gas and flue gas into a chimney after purification; (3) sending high temperature sludge carbon prepared in the step (2) into a cooling chamber, cooling, and breaking cooled sludge carbon into particles with the particle sizes less than 20mm in a breaking machine; and (4) stirring the following mixed materials in parts by weight, molding by casting in a mold, carrying out natural drying and maintenance in the mold, removing the mold, and drying. By preparing the building materials from the sludge, the cost is lowered, the land source is saved, and the pollution problem caused by the sludge to surrounding environments is solved.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal and resource treatment, and in particular relates to a method for preparing building materials by utilizing sludge pyrolysis. Background technique [0002] With the acceleration of urbanization and the rapid development of social economy, the urban population and modern factories continue to increase, which brings a huge amount of sewage. In order to protect the environment from sewage pollution, my country has gradually increased investment in sewage treatment facilities and raised sewage discharge standards. While improving the sewage treatment capacity, the problem of sludge disposal has become increasingly prominent. The sludge has complex components, including parasite eggs, heavy metals and pathogenic microorganisms, etc., and must be treated to prevent secondary pollution to the environment. At present, a large amount of unstabilized sludge has become a heavy burden for sewag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/02C04B18/10
CPCC04B18/10C04B28/00C04B38/02C04B2103/42C04B18/08C04B14/185C04B22/064C04B24/14C04B24/34C04B24/20C04B22/04Y02W30/91
Inventor 薛香玉
Owner SHAANXI UNIV OF SCI & TECH
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