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Method for gasifying and incinerating combustible solid wastes by utilizing rotary kiln

A solid waste, rotary kiln technology, applied in the field of resources and environment, can solve the problems of high operation and management costs, harm to health, long processing cycle, etc., to achieve the effect of improving resource utilization, avoiding secondary pollution, and improving environmental benefits

Inactive Publication Date: 2010-09-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country produces a large amount of agricultural and forestry waste, but it has not been fully utilized at present, and its utilization rate is less than 20%.
The investment in sanitary landfill is low, but it is very difficult to find the landfill site; the volume reduction effect of the composting method is not obvious, the area is large, the treatment cycle is long, and the heavy metals in the composting raw materials may endanger human health through the food chain; the incineration method The speed is fast and the capacity reduction effect is obvious, but there are also problems of large investment, high operation and management costs and serious secondary pollution

Method used

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  • Method for gasifying and incinerating combustible solid wastes by utilizing rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The oily sludge and urban sludge are fully stirred respectively and then mechanically dehydrated to obtain a mud cake with a moisture content of 40-50%. The obtained mud cake is broken and air-dried for more than 100 hours under natural conditions. When it contains water When the rate is 10-20%, store it for later use. Mix dry oily sludge, dry municipal sludge, crushed coal gangue, municipal solid waste, biomass and limestone at a ratio of 25%, 25%, 10%, 20%, 15% and 5% respectively and pass through the spiral The feeder feeds into the counter-flow rotary kiln gasifier. At 1100°C, the combustible components in the combustible solid waste mixture react with oxygen to generate partial combustion reaction to form H 2 , CO, CO 2 and a small amount of C n h m The crude gas, where H 2 And CO volume fraction reaches about 77%. The crude gas enters the secondary combustion chamber for full combustion after passing through the two-stage cyclone separator, and th...

Embodiment 2

[0031] Example 2: The drying process of oily sludge and urban sludge is as in Example 1. Mix dry oily sludge, dry municipal sludge, crushed coal gangue, municipal solid waste, biomass and limestone at a ratio of 20%, 20%, 20%, 25%, 10% and 5% respectively and pass through the spiral The feeder feeds into the rotary kiln gasifier. At 1150°C, the combustible components in the combustible solid waste mixture react with oxygen to partially burn to form H 2 , CO, CO 2 and a small amount of C n h m The crude gas, where H 2 And CO volume fraction reaches about 74%. The crude gas enters the secondary combustion chamber for full combustion after passing through the two-stage cyclone separator, and the high-temperature flue gas generated is recovered by the waste heat boiler and further purified for harmless discharge. Organic pollutants in oily sludge, municipal sludge, and municipal solid waste are decomposed at high temperature, and pathogenic bacteria and parasites are also ki...

Embodiment 3

[0032] Example 3: The drying process of oily sludge and urban sludge is as in Example 1. Mix dry oily sludge, dry municipal sludge, crushed coal gangue, municipal solid waste, biomass and limestone at a ratio of 15%, 15%, 10%, 20%, 37% and 3% respectively and pass through a spiral The feeder feeds into the rotary kiln gasifier. At 1200°C, the combustible components in the combustible solid waste mixture react with oxygen to partially burn to form H 2 , CO, CO 2 and a small amount of C n h m The crude gas, where H 2 And CO volume fraction reaches about 80%. The crude gas with more fly ash separated by the secondary cyclone separator is used to produce H-rich gas after further gas purification. 2 and CO clean combustible gas, where H 2 and CO volume fractions were 29% and 53%, respectively. Organic pollutants in oily sludge, municipal sludge, and municipal solid waste are decomposed at high temperature, and pathogenic bacteria and parasites are also killed at high temper...

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Abstract

The invention discloses a process for the combined gasification and incineration of oily sludge, municipal sludge, coal refuse, municipal solid wastes and biomasses by utilizing a rotary kiln, which comprises the following steps of: dehydrating the oily sludge and the municipal sludge respectively, and at the same time, crushing the coal refuse, the municipal solid wastes and the biomasses into particles of a certain particle size; mixing the oily sludge and the municipal sludge which are hydrated, and the coal refuse, the municipal solid wastes and the biomasses which are rushed in a certain proportion; delivering the mixture into a gasification furnace of the rotary kiln by using a spiral feeder and also delivering a gasification medium into the rotary kiln; performing pyrolysis and gasification reaction on the mixture of the various combustible solid wastes at the high temperature of 1,000 to 1,200 DEG C to generate a crude gas rich in H2 and CO; and under the co-action of the high-temperature rotary kiln and subsequent treatment facility, recycling energy in the combustible solid wastes and rationally treating most of pollutants.

Description

technical field [0001] The invention relates to the technical field of resources and environment, in particular to a combined gasification and incineration process of oily sludge, urban sludge, coal gangue, urban domestic garbage and biomass rotary kiln. Background technique [0002] With the development of my country's industrial production and the improvement of people's living standards, the annual production and accumulation of combustible solid waste generated by people in the process of production and life continues to increase. Combustible solid waste mainly includes oily sludge, coal gangue, biomass (agricultural and forestry waste), urban sludge and urban domestic waste, etc. The stacking of these combustible solid wastes will cause harm to the environment and people's health. Dealing with these combustible solid wastes and recovering the energy contained therein has become an important issue before people. [0003] Oily sludge is a solid waste produced during oil ...

Claims

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Application Information

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IPC IPC(8): F23G5/04F23G5/033F23G5/027F23G5/16F23G5/20F23G5/46
Inventor 胡建杭王华刘慧利赵鲁梅李磊
Owner KUNMING UNIV OF SCI & TECH
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