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Sludge incineration treatment method and device

A technology of sludge incineration and treatment method, applied in the fields of sludge treatment, water/sludge/sewage treatment, combustion method, etc., can solve the problems of waste of resources, increase of pollutants, low calorific value of domestic sludge, etc., to save energy Good heat and weight reduction effect

Pending Publication Date: 2018-10-23
TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, there are two problems in the sludge incineration disposal method. One is that the domestic sludge has a low calorific value and needs to be burned together with combustion aids such as coal or straw, which not only causes waste of resources, but also increases the generation of pollutants. Drying treatment is required. Sludge drying requires a lot of heat energy, and external energy needs to be supplemented, resulting in high energy consumption.
For example, a patented method for treating high-concentration organic matter sludge (patent number: 201410832960.4) discloses a method for treating high-concentration organic matter sludge. Low-temperature heat pump dehumidification and drying, mixed with biomass fuel oxygen-enriched combustion, the moisture content of the sludge after dehydration in this patent is below 50%, but it needs to be mixed with biomass fuel for incineration, high energy consumption, and increased pollution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0053] Sludge pretreatment: A certain domestic sludge has a moisture content of 85% and a calorific value of 1100kcal / kg. Adjust the sludge moisture content to 90%, stir for 2 hours, add inorganic dilute acid to the sludge solution, and adjust the sludge solution The pH is 1, stirred for 30 minutes, and settled for 1 hour. The precipitated sludge enters the desanding device, and quicklime is added to the desanded organic sludge to make the pH of the sludge solution neutral. After mixing evenly, add 1‰ of PAM to form Organic sludge flocs.

[0054] Sludge drying and incineration: The pretreated organic sludge is dehydrated by plate and frame. The moisture content of the dewatered sludge is 55%, and the dry basis heat value is 2450kcal / kg. After the dehydrated sludge is granulated, it enters the drying device and is dried The temperature of the hot air at the air inlet of the device is 100°C, the moisture content of the dried sludge is 25%, the humidity of the hot steam after dry...

Embodiment 2

[0056] Sludge pretreatment: A certain domestic sludge has a moisture content of 83% and a calorific value of 2300kcal / kg. Adjust the sludge moisture content to 95%, stir for 1 hour, add inorganic dilute acid to the sludge solution, and adjust the sludge solution The pH is 5, stirred for 1 hour, and settled for 2 hours. The precipitated sludge enters the desanding device, and quicklime is added to the desanded organic sludge to make the pH of the sludge solution neutral. After mixing evenly, add 1‰ of PAM to form Organic sludge flocs.

[0057] Sludge drying and incineration: The pretreated organic sludge is dehydrated by plate and frame. The moisture content of the dewatered sludge is 75%, and the dry basis heat value is 3500kcal / kg. After the dehydrated sludge is granulated, it enters the drying device and is dried. The temperature of the hot air at the air inlet of the device is 150°C, the moisture content of the dried sludge is 20%, the humidity of the hot steam after drying...

Embodiment 3

[0059] Sludge pretreatment: A certain domestic sludge has a moisture content of 86% and a calorific value of 2600kcal / kg. Adjust the sludge moisture content to 95%, stir for 1 hour, add inorganic dilute acid to the sludge solution, and adjust the sludge solution The pH is 4, stirred for 1 hour, and settled for 2 hours. The precipitated sludge enters the desanding device, and quicklime is added to the desanded organic sludge to make the pH of the sludge solution neutral. After mixing evenly, add 1‰ of PAM to form Organic sludge flocs.

[0060] Sludge drying and incineration: The pretreated organic sludge is dehydrated by plate and frame. The moisture content of the dewatered sludge is 70%, and the dry basis heat value is 3700kcal / kg. After the dehydrated sludge is granulated, it enters the drying device and is dried The temperature of the hot air at the air inlet of the device is 200°C, the moisture content of the dried sludge is 15%, the humidity of the hot steam after drying ...

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Abstract

The invention provides a sludge incineration treatment method and device. Aiming at the problems that the calorific value of domestic sludge is low, heat energy produced by sludge incineration is low,heat energy required for sludge drying is high, heat energy generated by sludge incineration is not enough to dry the sludge, and the heat energy need to be supplied, the sludge is pretreated, thus the calorific value of the sludge is increased, and the dehydration property of the sludge is improved; the pretreated organic sludge is dehydrated; after dehydration granulation, sludge particles aredried; the dried dry sludge is subjected to incineration treatment; cold air and heat vapor generated in the drying process are subjected to waste heat exchange, and then the cold air and flue gas generated by incineration are subjected to secondary heat exchange; and hot air subjected to heat exchange is used for sludge drying, and sludge drying and incineration heat balance are achieved.

Description

technical field [0001] The invention relates to the field of sludge incineration treatment, in particular to a method and device for sludge incineration treatment. Background technique [0002] Domestic sludge is solid sediment produced by municipal sewage treatment plants, which has the characteristics of high organic matter content, easy odor, large output and high moisture content. As of the end of 2015, the national urban sewage treatment plants had a treatment capacity of 140 million cubic meters per day, and the annual cumulative sewage treatment volume reached 41.03 billion cubic meters, and the annual sludge output reached 40 million tons. Cause air pollution, its high moisture content, random stacking will pollute groundwater, and its output is huge, the landfill site can no longer meet the current sludge production, it is necessary to develop new sludge treatment technology to achieve the reduction of domestic sludge, Harmless and resourceful. [0003] Sludge inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00C02F11/12C02F11/00C02F11/14
CPCF23G7/001C02F11/00C02F11/004C02F11/12C02F11/14F23G2209/12F23G2201/10F23G2201/80
Inventor 王学科穆童马竞男
Owner TIANJIN ENEW ENVIRONMENTAL PROTECTION ENGCO LTD
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