ANALYSIS ON SCALE FORMATION IN TREATMENT AND REUSE SYSTEM FOR COAL GASIFICATION ASH-CONTAINING WATER

AN Baihong; YANG Hongquan; LIU Jun; CHENG Yan; CHEN Hongbin

doi:10.13205/j.hjgc.202305008

Volume 41 Issue 5

May 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(5): 52-60

AN Baihong, YANG Hongquan, LIU Jun, CHENG Yan, CHEN Hongbin. ANALYSIS ON SCALE FORMATION IN TREATMENT AND REUSE SYSTEM FOR COAL GASIFICATION ASH-CONTAINING WATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 52-60. doi: 10.13205/j.hjgc.202305008

Citation:

AN Baihong, YANG Hongquan, LIU Jun, CHENG Yan, CHEN Hongbin. ANALYSIS ON SCALE FORMATION IN TREATMENT AND REUSE SYSTEM FOR COAL GASIFICATION ASH-CONTAINING WATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 52-60. doi: 10.13205/j.hjgc.202305008

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ANALYSIS ON SCALE FORMATION IN TREATMENT AND REUSE SYSTEM FOR COAL GASIFICATION ASH-CONTAINING WATER

doi: 10.13205/j.hjgc.202305008

1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Sinopec Ningbo Engineering Company Limited, Ningbo 315103, China;
3. Ningbo Shentong Environmental Technology Co., Ltd, Ningbo 315105, China

Received Date: 2022-08-07

Abstract

Abstract

The wastewater produced in the process of coal gasification is characterized by high values in temperature, hardness, ammonia and suspended solids, so the existing pretreatment facilities and reuse systems are severely scaled and clogged. In order to find out the cause of scale formation, based on the investigation of the operation of the treatment facilities, the composition and structure of scaling substance in ash-containing water treatment and recycling pipes and facilities of coal gasification units were studied. The result indicated that the scale morphology of ash-containing water pretreatment and reuse pipes and facilities was diverse, shaped in blocks, lines, tubes, balls and petals, which were complex compounds composed of silicon, calcium, magnesium, boron, aluminum, iron, sulfur, sodium, manganese, barium and other elements, and its main components were CaCO₃, Al₂O₃·SiO₂, MgCO₃·3H₂O, CaSiO₃, K₂O·Na₂O·Al₂O₃·SiO₂·H₂O, Fe₂O₃, CaSO₄, Ca₄Mg[B₄O₆(OH)₆](CO₃)₂, SiO₂, etc. The main causes of scale formation were tube wall deposition caused by calcium and magnesium hardness at high temperatures, compound co-precipitation of other elements, and residual ash particles adhering to the tube wall and bottom of facilities. Improving the pretreatment effect of black water and ash-containing water, especially enhancing the simultaneous removal efficiency of various metal and nonmetal ions at high temperature were the key to delaying the scaling of the ash-containing water treatment and reuse system.
- coal gasification,
- scale,
- morphology and composition,
- scale formation

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References(33)

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