YE Ji;CHEN Chuangting;ZOU Xiangbo;RAO Mumin;WEI Shuai;MAO Tieying;QIN Shiwei;KUANG Cao;CHEN Gongda;HU Zhihui;CHEN Tianchi;JIANG Yuan;WANG Qun;

• 1:Guangdong Energy Group Science and Technology Research Institute Co.
• 2:Ltd.
• 3:Guangdong Energy Group Co.
• 4:Ltd.

Abstract：

In the past 10 years, domestic scholars and engineers have carried out a large number of academic research and engineering applications related to coal-fired coupled sludge power generation technology, but most of the research and application are carried out at more than 70% load of the unit, and there are few rele-vant studies on the carbon emission reduction effect of coal-fired coupled sludge power generation. In order to understand the full range of effects of coal-fired coupled sludge power generation technology on boilers under medium and low load conditions, field engineering tests of coal-fired coupled domestic sludge power generation under 50% load were carried out on a 700 MW quadrangle tangential pulverized coal boiler. The effects of coal-fired coupled sludge power generation on boiler thermal efficiency, pollutant emission, dioxin emission, heavy metal content of by-product and CO_2 emission were systematically studied. The results show that under 50% rated load, the boiler thermal efficiency decreases by 0.52% with 3% sludge and 1.03% with 6% sludge, compared with that without sludge. With the increase of sludge ratio, the carbon content of slag also increases correspondingly, which directly leads to the increase of heat loss in physical incomplete combustion. The incineration sludge has no significant effect on the discharge of dust, SO_2, NO_x and other conventional pollutants in coal-fired power plants, and the treatment capacity of the environmental protection facilities of the power plant units can fully ensure that the regulated pollutant discharge during the incineration sludge is in line with ultra-low emission standards. The higher the proportion of mixed sludge, the higher the removal rate of dioxins in flue gas purification plant, and the dioxins toxicity equivalent of all operating conditions are lower than 0.01 ng/m~3 stipulated in DB 31/1291—2021 "Emission Standard of Air Pollutants in coal-fired coupled Sludge Power Plant". Cr, Cu, Zn in fly ash, Cr, As, Ba, Ni, Zn in slag, and Cu in desulfurized gypsum are relatively sensitive to sludge blending ratio. Considering the use of by-products for soil improvement, the heavy metal content of by-products in power plant under sludge blending condition still meets relevant agricultural standards. According to theoretical calculation, 3% sludge will emit 0.15% more CO_2, 6% sludge will emit 0.3% more CO_2, the application of coupled sludge power generation technology needs to be optimized in sludge type, sludge pretreatment, combustion load, combustion adjustment and other aspects, in order to achieve the synergistic effect of pollution reduction and carbon reduction.

Key Words： sludge;co-fired power generation;boiler thermal efficiency;dioxin;CO_2 emissions

Abstract:

Keywords:

Foundation: 国家重点研发计划资助项目(2021YFF0601001)

Authors: YE Ji;CHEN Chuangting;ZOU Xiangbo;RAO Mumin;WEI Shuai;MAO Tieying;QIN Shiwei;KUANG Cao;CHEN Gongda;HU Zhihui;CHEN Tianchi;JIANG Yuan;WANG Qun;

DOI: 10.13226/j.issn.1006-6772.SG23050301

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