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Sludge treatment method for drying sludge by using coal grinding machine and using sludge for electricity generation

A technology for sludge treatment and coal mill, which is applied in dewatering/drying/concentrating sludge treatment, oxidation treatment of sludge, vaporization of by-products, etc., can solve the problems of high moisture content of sludge, complicated process and large investment, etc. Achieve the effect of saving equipment investment, simplifying process and reducing coal consumption for power generation

Inactive Publication Date: 2010-06-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key technologies of these two patents both involve how to solve the problem of high water content in sludge. They both use special sludge drying equipment using steam or flue gas. The process is complicated and the investment is large. There are certain limitations in the application in power plants due to site and other restrictions

Method used

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  • Sludge treatment method for drying sludge by using coal grinding machine and using sludge for electricity generation
  • Sludge treatment method for drying sludge by using coal grinding machine and using sludge for electricity generation
  • Sludge treatment method for drying sludge by using coal grinding machine and using sludge for electricity generation

Examples

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Effect test

Embodiment 1

[0034] In a power plant with an installed capacity of 300MW, the coal pulverizer adopts the 4+1 operation mode, with 4 running and 1 standby. The output of the original single coal pulverizer is 36 tons / hour, and the single coal pulverizer can treat wet sewage with a moisture content of 70% every day The mud capacity is 70 tons, and 280 tons of wet sludge is treated as an example every day to illustrate the specific implementation method of the present invention. After transporting 280 tons / day of raw wet sludge to the power plant, store it in the sludge tank, transport it to the upper part of the coal mill through metering pumps and pipelines, and use the sludge feeder to introduce the sludge into the coal mill. The amount added is 8% of the raw coal (about 2.9 tons / unit.hour). The waste heat of the flue gas from the power plant boiler exchanges heat with the air introduced by the fan through the air preheater, and the generated primary air at 260°C is directly blown into the...

Embodiment 2

[0036]For a power plant with an installed capacity of 200MW, the coal pulverizer adopts the 4+1 operation mode, 4 units are in operation and 1 is used as a backup. The output of the original single coal pulverizer is 25 tons / hour, and the daily water content of a single coal pulverizer is 75% of the total weight. Take 42 tons of sludge, and treat 168 tons of wet sludge every day as an example to illustrate the specific implementation method of the present invention. After transporting 168 tons / day of raw wet sludge to the power plant, store it in the sludge tank, transport it to the upper part of the coal mill through metering pumps and pipelines, and use the sludge feeder to introduce the sludge into the coal mill. The amount added is 7% of the weight of raw coal (about 1.75 tons / unit.hour). The waste heat of the flue gas from the boiler in the power station exchanges heat with the air introduced by the fan through the air preheater, and the generated primary air at 260°C is ...

Embodiment 3

[0038] In a power plant with an installed capacity of 135MW, the coal mill adopts 3+1 operation mode, with 3 running and 1 standby. The output of the original single coal mill is 20 tons / hour, and the daily water content of a single coal mill is 85% of the total weight. Take 24 tons of sludge, and treat 72 tons of sludge every day as an example to illustrate the specific implementation method of the present invention. After transporting 72 tons / day of wet sludge to the power plant, store it in the sludge tank, transport it to the upper part of the coal mill through metering pumps and pipelines, and use the sludge feeder to introduce the sludge into the coal mill. The addition of sludge The amount is 5% of the raw coal (about 1.0 tons / unit.hour). The waste heat of the flue gas from the power plant boiler exchanges heat with the air introduced by the fan through the air preheater, and the generated primary air at 260°C is directly blown into the coal mill as a drying heat source...

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Abstract

The invention discloses a sludge treatment method for drying sludge by using a coal grinding machine and using the sludge for electricity generation. The method comprises the following steps of: 1) directly introducing wet sludge with the moisture content of 70 to 90 percent into the coal grinding machine, wherein the ratio of the wet sludge is 2 to 10 percent of a fuel coal; 2) performing heat exchange between the waste heat of a utility boiler flue gas and air to generate primary air blown into the coal grinding machine, mixing the sludge with the fuel coal in the coal grinding machine, and performing grinding while drying; and 3) spraying the coal powder containing the dried sludge into the utility boiler for burning and generating electricity. The coal grinding machine which is also used as sludge drying equipment is characterized in that a hot air introduction device is a rotary type hot air nozzle ring, a powder reflux device is a through-type flow-guiding powder reflux cone, and a separating device is a rotary separator with a first separate stationary blade. The sludge treatment method makes full use of the original process of an electric power plant, makes full use of the waste heat of the flue gas and the heat value of the sludge, and acquires no additional hot resource or device for drying the sludge, and has the advantages of investment saving, low operation cost, no secondary pollution and the like.

Description

technical field [0001] The invention relates to a method for harmless disposal and resource utilization of sludge, in particular to a sludge treatment method for using a coal mill in a power plant to dry the sludge and use it for power generation. Background technique [0002] With the development of social economy and urbanization, the amount of urban and industrial sewage is increasing, and the amount of sludge in sewage treatment plants is increasing day by day. The composition of sludge is very complex. It is an aggregate composed of bacteria-containing micelles formed by various microorganisms and the organic and inorganic substances adsorbed. In addition to containing a large amount of water (up to 80%), it also contains refractory organic substances. , heavy metals and salts, as well as pathogenic microorganisms and parasite eggs, etc., if not effectively disposed of, will cause serious harm to the environment. [0003] On the other hand, although the sludge has comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/06
CPCY02W10/40
Inventor 陈胡星陈幼荣康毅忠丁洪录
Owner ZHEJIANG UNIV
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