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Blending combustion method of oily sludge in coal-fired boiler

A coal-fired boiler and sludge technology, applied in the direction of combustion method, combustion type, combustion equipment, etc., to achieve the effects of reducing energy consumption, increasing economic benefits, and improving utilization

Pending Publication Date: 2022-05-10
梵境新能源科技(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the need to use external energy for drying when oily sludge is mixed into coal as fuel in coal-fired boilers in the prior art, which increases energy consumption and increases NO in flue gas during coal combustion. X , SO 2 and heavy metal emissions, a method for co-firing oily sludge in coal-fired boilers is provided, in which oily sludge and distiller's grains are mixed with coal powder to reduce NO in the combustion process. X , SO 2 and the emission of heavy metals; at the same time, the heat in the secondary air is used to dry the oily sludge and distiller's grains, which reduces the use of additional heat sources for drying and reduces the energy consumption of the system

Method used

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  • Blending combustion method of oily sludge in coal-fired boiler
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Examples

Experimental program
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Effect test

Embodiment 1

[0035] A kind of mixed burning method using above-mentioned system, comprises the steps:

[0036](1) Mix the oily sludge and distiller's grains with a mass ratio of 38:15 in a closed hazardous waste pit, the mixture enters the drying device, and the mixture is dried by the secondary air provided by the secondary fan, and the mixture entering the drying device The quality of the boiler is 4t / h; the secondary air volume is 83527Nm under the working condition of BMCR (maximum continuous evaporation capacity of the boiler) 3 / h, the secondary air temperature is 210°C, and the ratio of primary air to secondary air is 50:50 (v:v);

[0037] (2) Crushing and pulverizing the dried mixture to 10 meshes to obtain hazardous waste powder;

[0038] (3) Hazardous waste powder and coal powder are sent together into a coal-fired boiler for incineration. The mass ratio of hazardous waste powder to coal powder is 30:70, and the furnace center temperature is 900°C during incineration.

[0039] ...

Embodiment 2

[0046] A kind of mixed burning method using above-mentioned system, comprises the steps:

[0047] (1) Mix oily sludge (water content 30.5%) and distiller's grains (water content 63.51%) with a mass ratio of 35:15 in a closed hazardous waste pit, the mixture enters the drying device, and the secondary air provided by the secondary fan The air dries the mixture, and the mass of the mixture entering the drying device is 4t / h; the secondary air volume is 83527Nm under the working condition of BMCR (maximum continuous evaporation capacity of boiler) 3 / h, the secondary air temperature is 200°C, and the ratio of primary air to secondary air is 50:50 (v:v);

[0048] (2) Crushing and pulverizing the dried mixture to 10 meshes to obtain hazardous waste powder;

[0049] (3) Hazardous waste powder and coal powder are sent together into a coal-fired boiler for incineration. The mass ratio of hazardous waste powder to coal powder is 25:75, and the furnace center temperature is 900°C durin...

Embodiment 3

[0051] A kind of mixed burning method using above-mentioned system, comprises the steps:

[0052] (1) Mix oily sludge (water content 31.8%) and distiller's grains (water content 60.33%) with a mass ratio of 40:15 in a closed hazardous waste pit, the mixture enters the drying device, and the secondary air provided by the secondary fan The air dries the mixture, and the mass of the mixture entering the drying device is 4t / h; the secondary air volume is 83527Nm under the working condition of BMCR (maximum continuous evaporation capacity of boiler) 3 / h, the secondary air temperature is 250°C, and the ratio of primary air to secondary air is 60:40 (v:v);

[0053] (2) Crushing and pulverizing the dried mixture to 10 meshes to obtain hazardous waste powder;

[0054] (3) Hazardous waste powder and coal powder are fed into a coal-fired boiler for incineration. The mass ratio of hazardous waste powder to coal powder is 20:80, and the furnace center temperature is 900°C during incinera...

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Abstract

The invention discloses a blending combustion method of oily sludge in a coal-fired boiler, which comprises the following steps: (1) mixing the oily sludge and vinasse, and drying the mixture through secondary air of the coal-fired boiler; (2) crushing the dried mixture to obtain hazardous waste powder; and (3) the hazardous waste powder and the pulverized coal are jointly fed into a coal-fired boiler to be incinerated. According to the invention, the oily sludge, the vinasse and the pulverized coal are mixed and combusted, so that the emission of NOX, SO2 and heavy metals in the combustion process is reduced; meanwhile, the oily sludge and the vinasse are dried by utilizing heat in the secondary air, so that the use of an extra heat source required by drying is reduced, and the energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment, in particular to a method for co-combusting oily sludge in a coal-fired boiler. Background technique [0002] Oily sludge is a kind of solid waste rich in mineral oil, which belongs to the HW08 waste in the "National Hazardous Waste List". Usually, the sludge contains certain crude oil, heavy metal ions and inorganic salt compounds. Oily sludge generally contains benzene series, phenols and other substances, and is accompanied by stench and toxicity. If it is directly in contact with the natural environment, it will poison, acidify or alkalize the land, lead to changes in soil and soil structure, and hinder the growth of plant roots. And it will cause great pollution to water bodies and vegetation, and it also means a waste of oil resources. [0003] At present, the technologies for treating oily sludge mainly include resource recovery, harmless treatment and comprehensive util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/06F23G5/033F23G5/04F23G5/44F23G7/00
CPCF23C7/06F23G5/033F23G5/04F23G5/444F23G7/001F23G2201/10F23G2201/80F23G2206/10F23G2209/12Y02E20/34
Inventor 孙宁贺帅佘艳马国保黄河周志江王兴琦
Owner 梵境新能源科技(浙江)有限公司