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Garbage and sludge high pressure themolysis processing method, system and application thereof

A treatment method and pyrolysis reactor technology, applied in the field of solid waste treatment process, can solve the problems of waste of resources and energy, deterioration of natural properties and stability of landfill land, secondary pollution of leachate, etc., and achieve improvement Treatment efficiency, reducing the probability of dioxin generation, and the effect of solving air pollution

Active Publication Date: 2012-05-30
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems will arise: First, the natural properties and stability of landfill land will deteriorate, causing secondary pollution such as leachate; second, the available volume of the landfill site will gradually decrease, and the landfill site will also be affected. Third, when garbage and sludge are landfilled, available materials and energy are also landfilled, resulting in waste of resources and energy
The processing objects of this process are mainly urban domestic garbage and sludge. After the material is digested, it is directly drained, and then the digested material is sprayed into the discharge workshop. The disadvantage is that the sprayed material needs to be collected and transported before it can be screened and magnetically separated.
However, magnetic separation can only sort out scrap iron and steel, but cannot sort out copper, aluminum, stainless steel, etc.

Method used

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  • Garbage and sludge high pressure themolysis processing method, system and application thereof
  • Garbage and sludge high pressure themolysis processing method, system and application thereof
  • Garbage and sludge high pressure themolysis processing method, system and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] See the basic process flow figure 1 . A brief description is as follows:

[0063] The dewatered sludge composition of a sewage treatment plant in a city in Guangdong Province is as follows, organic matter (C) 29.5% (by dry weight), N 2.1% (by dry weight), P 2 o 5 1.9% (by dry weight), K 2 O 0.7% (by dry weight), calorific value is 2800Kcal / Kg, and moisture content is 80%.

[0064] The composition of domestic waste in this city is as follows (calculated by wet weight): 0.79% metal, 3.06% plastic, 69.78% kitchen waste, 18.39% paper, 3.32% textile, 4.66% inert substance, and 42% water content.

[0065]The above domestic garbage and sludge are weighed, and the garbage is sent to a large-hole sieve. After the garbage with a size larger than 400mm is screened out, it is mixed with the sludge at a volume ratio of 7:3, and the material is sent to the pyrolysis reactor by the conveyor belt. Saturated water vapor is provided by the solar heat collector, and when the amount ...

Embodiment 2

[0067] Waste-to-energy pretreatment process see figure 2 . A brief description is as follows:

[0068] The composition of a municipal solid waste is as follows (by wet weight): metal 1.88%, plastic 14.60%, kitchen waste 39.18%, paper 15.9%, dust 23.32%, other 5.12%, moisture content 54%.

[0069] The above-mentioned domestic garbage is weighed and sent to a large-hole sieve, and after the garbage with a size larger than 500mm is screened out, the material is sent to the pyrolysis reactor through a conveyor belt. Saturated water vapor is provided by the solar heat collector, and when the amount of steam is insufficient, add the steam generated by the auxiliary boiler to make the internal pressure of the pyrolysis reactor reach 14atm, and the temperature is 180-190°C, keep it for 1 hour and then discharge the steam, when the pressure drops to 6atm , open the drain valve to discharge the pyrolysis solution. Continue to reduce the pressure of the pyrolysis reactor, and when th...

Embodiment 3

[0071] The composition of domestic waste in a large community is (by wet weight): 0.79% metal, 18.06% plastic, 39.78% kitchen and yard waste, 13.39% paper, 4.32% textile, 23.66% inert material, and 36% moisture content. The domestic garbage is sent into the pyrolysis reactor through the conveyor belt, and steam is introduced to make the temperature of the reactor reach 190° C., and the pressure is controlled at 15 atm for 0.5 hours. Reduce the pressure, open the drain valve, and discharge the pyrolysis solution. Close the drain valve, continue to reduce the pressure, and then discharge the material into the flash evaporator. After the flash evaporation is completed, the material is transported from the flash evaporator to the dryer with a screw conveyor. The steam generated by decompression, the secondary steam generated by the evaporator and the steam generated by flash evaporation are led to the water-gas separator through the pipeline, and the steam part is led to the stea...

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Abstract

The invention discloses a garbage and sludge high pressure themolysis processing method, system and application thereof. The invention carries out themolysis reaction for 5min-1.5h under the conditions of 8-80atm and 150-320 DEG C and three times of dehydration drying, not only heat value of garbage and sludge is greatly improved, dehydration, benzene removing, dechloridation, deodorization, disinfection, sterilization, volume reduction, bag breaking and degradation decomposition are carried out on garbage and / or sludge and percolation liquid is treated, and clean energy and recycled self-circulation heat are taken as heat supply energy source, energy consumption is reduced; but also method in material is rejected, so as to reduce the production probability of dioxin in garbage incineration smoke. The invention realizes garbage and sludge comprehensive reclamation, including power supply, heat supply, production of multiple organic compound fertilizers and environmentally friendly building materials and direct recovery of metal, battery and plastic. The invention can realize preparation of garbage and sludge organic compound fertilizer and feed, pre-treatment of garbage incineration generating and pre-treatment of garbage themolysis generating and has the characteristics of environmental protection, energy conservation and wide application range.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment technology, in particular to a high-pressure pyrolysis treatment method and system for garbage and sludge and its application. Background technique [0002] The amount of domestic waste produced in cities and towns in my country has grown synchronously with the speed of social economy and the process of urbanization. However, my country's domestic waste treatment and disposal technology is relatively lagging behind, and the problem of urban domestic waste pollution is quite serious. If the domestic waste is not treated in a timely and reasonable manner, then in the next few decades, urban domestic waste will inevitably hinder the rapid development of cities. Traditional waste incineration power generation requires waste with a moisture content of 40% to 60%, an ash content of less than 25%, and a calorific value of about 1000kcal / kg. However, in reality, the moisture content of was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C02F11/10
CPCY02W10/33Y02W10/37Y02W10/40
Inventor 王春铭
Owner SOUTH CHINA AGRI UNIV
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