Hezhongsi | Guodi Hanchuan Phase III 2×1000MW Expansion Project Desulfurization Wastewater Deep Treatment Evaporation Crystallization Project
Published Time:
2025-06-27
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I. Project Introduction
1. User Introduction
Owner's Name: Guodian Hanchuan Power Generation Co., Ltd.
Construction Location: Hanchuan Power Plant is located in Caojiatai, Hanchuan City, Hubei Province. The plant is situated in the Hanjiang Plain, on the north bank of the lower reaches of the Han River, in Caojiatai, Hanchuan City, Hubei Province. It is adjacent to Xinguo Town on the outskirts of Wuhan City, 45km southeast of downtown Wuhan, and 10km west of Hanchuan City.
2. Project Scale
China's first million-unit desulfurization wastewater zero-discharge project that achieves resource utilization. The Phase I and II projects of Guodian Hanchuan Power Plant have an installed capacity of 4×330MW, completed and put into operation in 1991 and 1998 respectively. It is the first large-scale thermal power plant in Hubei Province.
The Phase III expansion project of Guodian Hanchuan Power Plant plans to construct two 1000MW ultra-supercritical coal-fired units, along with simultaneous construction of flue gas desulfurization and denitrification facilities. Project commissioning date: 2017.
3. Overview of Desulfurization Wastewater System
Guodian Hanchuan Power Generation Co., Ltd. is the first large-scale thermal power plant in Hubei Province, constructed in three phases with a total of six units, with a total desulfurization wastewater volume of 36m3/h. The raw water of the desulfurization wastewater is neutralized (alkalized) and flocculated using conventional treatment methods before being sent to the clarifier/thickener. The effluent from the clarifier/thickener is acidified in the clear water tank to meet the standards, and the sludge at the bottom is sent to the dewatering machine by a sludge transfer pump, with the resulting mud cake transported externally.
Conventional desulfurization wastewater treatment equipment is located in the desulfurization island, and the wastewater discharged from the desulfurization island enters the evaporation crystallization system. The desulfurization wastewater system process is as follows: raw water, nanofiltration system, product water, high-pressure membrane concentration, evaporation crystallization system, industrial refined secondary salt.
4. Design Water Volume and Water Quality of the Evaporation Crystallization System
After pretreatment and membrane concentration, the wastewater entering the evaporator crystallizer is 8m3/h. The influent to the evaporation crystallization system is concentrated brine discharged from the upstream equipment; its water quality parameters are shown in Table 1. After treatment by the evaporation crystallization system, product water and crystalline salt are obtained.
The water quality standards are: pH value 6.8-7.8; total dissolved solids (TDS) mass concentration ≤100mg/L.
The crystalline salt quality standards are: sodium chloride mass fraction ≥97.5%; moisture ≤0.80%; water-insoluble matter mass fraction ≤0.20%; calcium and magnesium ion mass fraction ≤0.60%; sulfate ion mass fraction ≤0.90% (GB/T5462-2003 Refined industrial salt secondary standard as stipulated in the standard for industrial salt).
Table 1 Water Quality Parameters of Influent to Evaporation Crystallization System
II. Technology and Typical Application Scenarios
In view of the high energy consumption of multi-effect evaporators, Guodian Langxinming Nanjing Branch, the general contractor, decided to adopt MVR evaporation crystallization technology. After technical performance demonstration and comprehensive selection by industry experts, Hezhongsi won the bid from several international bidders and was responsible for the design and supply of complete sets of equipment. Based on the introduction of international renowned brand Weiteng technology and product equipment, Hezhongsi, through design and system integration optimization, designed the optimal MVR evaporation crystallization process scheme for this project.
Hezhongsi, combining the characteristics of wastewater in this project, selected the MVR forced circulation evaporation crystallization system, using evaporation crystallization and drying methods to convert concentrated saline wastewater into crystalline salt. The evaporation and concentration process is shown in Figure 1.
Figure 1 Evaporation and Concentration Process
After pretreatment softening, salt separation, and concentration reduction, the Hanchuan project's desulfurization wastewater enters the MVR evaporation crystallization system. The solute in this concentrated brine is mainly sodium chloride, with a concentrated brine volume of approximately 8t/h. The evaporated crystalline salt is dried by a fluidized bed and automatically packaged. The final product is bagged sodium chloride with a purity higher than 97.5%, meeting the secondary standard for refined industrial salt stipulated in GB/T5462-2003 Industrial Salt.
III. Economic and Social Benefits
The desulfurization wastewater MVR evaporation crystallization technology provided by Hezhongsi can be effectively combined with the salt separation process. While meeting the requirements of zero wastewater discharge, the solid waste is ultimately converted into refined secondary industrial salt. Compared with traditional technologies, the MVR evaporation crystallization system is more energy-efficient and environmentally friendly, saving more than 60% of operating costs compared to traditional multi-effect evaporators.
The implementation of national strategies such as "Jingjinji," "Yangtze River Economic Belt," and "One Belt, One Road" is inseparable from industrial construction. At the top-level design level of national infrastructure construction, the implementation of the concept of green development has become paramount. While industrial development is progressing, it faces enormous environmental pressure. "Zero discharge" technology can alleviate the problem of increasingly scarce water resources and avoid environmental pollution caused by wastewater discharge.
The successful implementation of the Guodian Hanchuan Power Plant wastewater "zero discharge" MVR evaporation crystallization project shows that Hezhongsi Company has now fully mastered the core technology of wastewater "zero discharge" MVR evaporation crystallization. The extraction of high-purity industrial salt from desulfurization wastewater has reached an internationally advanced level, providing technical support for the harmonious development of national infrastructure and environmental protection.
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