Characteristics of Chlorine Releasing from Coal-Fired Power Plant

Sun, Qianqian; Fang, Tingting; Da, Chunnian

doi:10.3390/atmos12121550

Cited by 9 publications

(6 citation statements)

References 22 publications

(17 reference statements)

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“…The ash content of the sample influences the development of deposits on the probe, with the mixture of coal and plastic samples having a higher K content than the coal sample. At 600 o C, the high K content in the mixed biomass sample begins to move into the gas phase, where it decomposes and releases K organic [4,22]. It has also been confirmed by Shi et al and Wang et al that the temperature of the gas has a significant impact on mineral transformation, which might have an impact on deposits [23,24].…”

Section: Probe After Ash Collectedmentioning

confidence: 63%

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

Karuana¹,

Nainggolan²,

Ruhiyat³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Synthetic waste may be used as biomass fuel in a coal-fired power plant (CFPP) or as part of a coal mixture via co-firing. Differences in characteristics can cause problems during combustion, especially in plastic waste containing high alkali and chlorine content. The purpose of this research is to analyze the features of coal combustion with biomass and synthetic waste mixture to assess the effects of combustion. Combustion is conducted in a drop tube furnace (DTF) by analyzing the possibility of slagging, fouling and corrosion of the ash produced from each fuel. From the results of burning coal, no ashes stuck, only a trace of dust, in contrast to the results of burning coal with a mixture of 25% biomass and synthetic waste which produces a dark colour and has a tendency to stick to the probe. The change in the texture of the probe surface indicates that burning coal with a 25% mixture of biomass and synthetic waste is an unsafe composition for slagging, fouling, and corrosion.

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Section: Probe After Ash Collectedmentioning

confidence: 63%

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

Karuana¹,

Nainggolan²,

Ruhiyat³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…In most power plants, the "limestone-gypsum wet desulfurization process" is used for flue gas desulfurization; as a result, HCl would be introduced into the desulfurization tower along with the flue gas, and absorbed by the circulating slurry. The desulfurization system could absorb 93%-98% of HCl [2], which would increase the concentration of Clin the desulfurization slurry, leading to adverse effects such as lower pH of the slurry, accelerated equipment corrosion [3], and degradation of gypsum. In order to ensure the normal operation of the desulfurization system and the quality of gypsum, the concentration of Clin the absorption tower should be lower than 20,000mg/L [4].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculation and Design for Desulfurization Wastewater Flue Gas Evaporation Zero Discharge System of the 1,000 MW Unit

Wang,

Xie,

Wang

et al. 2024

Advances in Transdisciplinary Engineering

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For achieving zero discharge of desulfurization wastewater, the 2×1,000MW Unit of a power plant in Hunan adopts the process of “low-temperature flue gas evaporation and concentration+high-temperature flue gas bypass drying and curing”. The heat source of the low-temperature concentration tower comes from the flue gas (97°C) after the induced draft fan, for direct heat exchange in the tower through counter-current spraying of desulfurization wastewater, with the concentration ratio of 4 or above. The high-temperature flue gas bypass drying tower extracts high-temperature flue gas in front of inlet of the air pre-heater, and process the concentrated solution in the rotary atomizing and drying tower for zero discharge. This paper focuses on studying the thermodynamic calculation regarding the low-temperature flue gas evaporation and concentration system and high-temperature flue gas drying and curing system, so as to establish a balance of quality and capability, and calculate the basic data for system design by the trial method. Meanwhile, it further studies the quantitative calculation of impact of the zero discharge system on thermal and economic indexes such as boiler efficiency and standard coal consumption. The maximum processing rate of each 1,000MW Unit can reach 13m3/h, requiring 13.61% of low-temperature flue gas. The high-temperature drying tower is designed to dry the concentrated solution at a rate of 6m3/h, requiring 1.73% of high-temperature flue gas. As a result, the temperature of flue gas at the outlet of the air pre-heater can be lowered by about 3°C, the air temperature at the primary and secondary outlets can be lowered by about 1°C, the boiler efficiency can be decreased by 0.066%, and standard coal consumption can be increased by about 0.183g/kWh.

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“…Chlorine and its compounds are commonly regarded as harmful species, which causes severe corrosion and deposition to boiler tubes. HCl is a typical chlorine compound, which is easily released from combustion of coal, biomass, and municipal waste sludge, 1 threatening the equipment and bringing serious hazards to human beings and environments 2 . In addition, it is noteworthy that the emission of HCl could promote the toxicity of mercury by oxidizing elemental mercury (Hg 0 ) to divalent mercury (Hg 2+ ) 3 .…”

Section: Introductionmentioning

confidence: 99%

“…HCl is a typical chlorine compound, which is easily released from combustion of coal, biomass, and municipal waste sludge, 1 threatening the equipment and bringing serious hazards to human beings and environments. 2 In addition, it is noteworthy that the emission of HCl could promote the toxicity of mercury by oxidizing elemental mercury (Hg 0 ) to divalent mercury (Hg 2+ ). 3 The chlorine species in coal and biomass are usually exists in the form of organics or inorganics mainly originating from the organic Cl and Cl ions embedded in the micropores in the fuel.…”

Section: Introductionmentioning

confidence: 99%

Investigation on mechanochemically modified calcium‐based adsorbent for flue gas HCl removal

Shen

Liu

Xiang

et al. 2022

Asia-Pacific J Chem Eng

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For purpose of reducing chlorine ions entering the wet flue gas desulfurazition (WFGD) tower to realize the WFGD waste water sequestration and the gypsum upgrading, a technical method of adsorbent injection into flue gas to remove HCl was proposed in this work. A new NaOH-modified CaO (CA-MC-NA) was prepared by the mechanochemical ball milling method as a superior adsorbent for HCl removal in flue gas. The influence of particle size and Na doping on the dechlorination efficiency and chlorine capacity was investigated in a fixed bed reaction system. The experimental results demonstrated that the HCl removal performance is improved significantly under proper particle size and Na doping, as manifested by the experiment results that the chlorine capacity increases from 27.18 to 38.36 mg/g by simple mechanical ball milling, while it surprisingly reaches 75.36 mg/g by doping 5 wt.% NaOH. The surface physicochemical characteristics was explored by combined sample characterization of BET, XRD, SEM, elemental mapping, and particle size distribution. Dechlorination mechanism of the adsorbents were deduced and discussed. It shows that the mechanical ball milling process reduces the particle sizes to the submicron scale that induces the break and reconstruction of molecular interfacial bonds. It also increases the oxygen defects on the adsorbent surface. The doping of NaOH does not change the crystal structure of the dechlorinator, and Na ions can be chemically loaded over CaO in the form of ionic bonds.Free oxygen atoms or adsorbed oxygen molecules could combine with dissociated hydrogen atoms thus forming hydroxide radicals, which enhances the alkalinity of the adsorbent and boosts the removal of hydrogen chloride.

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Characteristics of Chlorine Releasing from Coal-Fired Power Plant

Cited by 9 publications

References 22 publications

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

Thermodynamic Calculation and Design for Desulfurization Wastewater Flue Gas Evaporation Zero Discharge System of the 1,000 MW Unit

Investigation on mechanochemically modified calcium‐based adsorbent for flue gas HCl removal

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