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Slagging resistance method for mixed burning of biomass and sludge

A mixed combustion and biomass technology, applied in the direction of combustion method, combustion type, dehydration/drying/thickened sludge treatment, etc., can solve the problems of waste of resources, environmental pollution, etc., and achieve the effect of avoiding secondary pollution and saving resources

Inactive Publication Date: 2013-10-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, directly adding magnesium oxide, aluminum hydroxide, calcium oxide and other substances as additives not only wastes resources, but also causes pollution to the environment after combustion

Method used

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  • Slagging resistance method for mixed burning of biomass and sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The sludge discharged from the secondary settling tank enters the concentration flocculation system and then adds aluminum sulfate with a weight ratio of 1:500 to the dry sludge as a flocculant to flocculate the sludge. CaO with a weight ratio of 1:10 is used as a conditioner to condition the sludge, and then dehydrate the sludge with dehydration equipment such as a plate and frame filter press. The dehydrated sludge is dried until the water content is 30 %, enter the crushing system for crushing, and the crushed sludge and biomass are mixed at a mass ratio of 1:1 to prepare shaped fuel and sent to the biomass boiler for combustion. On the basis of sludge disposal, this method recovers heat, and at the same time, the anti-slagging elements contained in the sludge increase the ash melting point of biomass combustion. After half a year of continuous operation, the boiler has no slagging phenomenon.

Embodiment 2

[0023] After the sludge discharged from the secondary sedimentation tank enters the thickening and flocculation system, polyaluminum chloride with a weight ratio of 1:300 to the dry sludge is added as a flocculant to flocculate the sludge, and the sludge obtained by flocculation and concentration enters the dehydration system and then added CaO with a weight ratio of 1:100 to the dry sludge is used as a conditioner to condition the sludge, and then the sludge is dehydrated by dehydration equipment such as a plate and frame filter press, and the dehydrated sludge is dried to moisture After it is below 30%, it enters the crushing system for crushing. The crushed sludge and biomass are mixed at a mass ratio of 1:5 to prepare shaped fuel and sent to the biomass boiler for combustion. After being blended with sludge, the slagging of the biomass boiler has been significantly improved compared with burning biomass only after half a year of continuous operation.

Embodiment 3

[0025] After the sludge discharged from the secondary sedimentation tank enters the thickening and flocculation system, polyaluminum magnesium silicate with a weight ratio of 1:200 to the dry sludge is added as a flocculant to carry out flocculation treatment on the sludge, and the sludge obtained by flocculation and concentration enters the dehydration system Adding CaO with a weight-to-weight ratio of 1:50 as a conditioner to the sludge is used as a conditioner to condition the sludge, and then use dehydration equipment such as a plate and frame filter press to dehydrate the sludge, and the dehydrated sludge is dried to After the moisture is below 30%, it enters the crushing system for crushing. The crushed sludge and biomass are mixed at a mass ratio of 5:1 and then directly sent to the biomass boiler for combustion. The blending of sludge in the biomass combustion process not only solves the problem of sludge disposal in nearby sewage treatment plants, but also avoids the a...

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Abstract

The invention relates to a slagging resistance method for mixed burning of biomass and sludge. Sludge is added with flocculant for flocculation concentration, wherein weight ratio of the flocculant to the dry sludge is 1: (500-200). The concentrated sludge is added with a CaO tempering agent for dehydration treatment, wherein weight ratio of the CaO to dry sludge is 1: (100-10). The dehydrated sludge is dried and ground, and is then burnt after being mixed with biomass. Sludge discharged from a secondary sedimentation tank of a sewage treatment plant is added with aluminum, magnesium, calcium and other elements which contain biomass and function as resisting slagging in a burning process as conditioning agents to flocculate and dehydrate the sludge, and the sludge is directly burnt after being mixed with the biomass or burnt after being prepared and shaped into fuel, thus solving a problem of slagging in the biomass burning process. The method avoids direct addition of magnesium oxide, aluminum hydroxide, calcium oxide and other slagging-resistance additives, so as to avoid secondary pollution while saving resource; meanwhile, the method realizes resource utilization of the sludge, thus achieving two purposes.

Description

technical field [0001] The invention relates to an anti-slagging method for mixed combustion of biomass and sludge, which belongs to the field of solid waste disposal and resource utilization. Background technique [0002] Biomass combustion utilization technology is currently the most mature biomass energy utilization process and has achieved large-scale application. However, since biomass fuel itself contains a certain amount of alkali metal elements, the combination of alkali metals (mainly K) and silica is easy to form eutectic K with a low melting point. 2 Si 2 o 5 , resulting in lower ash melting point and easy slagging. The use of oxide or salt additives containing magnesium, aluminum, and calcium can increase the ash melting point of the biomass combustion process and reduce slagging corrosion. Patent CN201010130394.4 (application date: 2010.03.23) proposes an anti-slagging additive composed of magnesium carbonate, aluminum oxide and calcium carbonate; , Anti-sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C10L9/10C10L10/04F23G7/00
Inventor 吕学斌张书廷
Owner TIANJIN UNIV
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