Zero discharge of industrial wastewater_Hezhong Environment (Beijing) Co., Ltd. was established in 2003

Blog

Home page

Congratulations丨The water balance optimization and zero wastewater discharge project of the State Power Investment Group has successfully passed the 168 trial run

2021

Summary of 7 major problems in evaporative crystallization!

2021

Have you mastered it? 10 essential basic knowledge points of wastewater treatment

2021

How to deal with reverse osmosis membrane blockage

1. Concentration Polarization In reverse osmosis desalination systems, the selective permeability of the membrane causes water molecules to continuously pass through the membrane from the high-pressure side, while solute molecules remain in the original solution. This leads to a concentration difference between the feed solution on the membrane surface and the inlet feed solution. In severe cases, a high concentration gradient may occur. This phenomenon is called concentration polarization. Concentration polarization increases the osmotic pressure of the feed solution, reduces the effective driving force, and causes a decrease in water permeation rate and desalination rate.

2021

What exactly is high-salinity wastewater?

High-salinity wastewater refers to wastewater with a total salt concentration of at least 1%. It mainly comes from chemical plants and the collection and processing of oil and natural gas. This wastewater contains a variety of substances (including salts, oil, organic heavy metals, and radioactive substances). The sources of saline wastewater are widespread, and the volume of water is increasing year by year. Removing organic pollutants from saline wastewater is crucial to environmental protection. When using biological treatment methods, high concentrations of salts inhibit microorganisms. Physical and chemical methods require large investments, high operating costs, and may not achieve the desired purification effect. Biological treatment remains a focus of research at home and abroad for this type of wastewater.

2021

Analysis of the low-temperature flash evaporation and concentration technology (Honzon Think HLTC) in the zero-discharge project for desulfurization wastewater from national energy power plants

Statistical data from the past five years shows that China's current power generation structure is still dominated by thermal power generation, accounting for about 70%; followed by hydropower, accounting for about 14%; nuclear power accounts for 5%, and wind power and solar power account for a smaller proportion. Data source: National Bureau of Statistics Thermal power generation is mainly dominated by coal-fired power generation, and the combustion of coal produces a large amount of pollutants such as sulfur dioxide, nitrogen oxides, and dust. In order to reduce the pollution of flue gas emissions, coal-fired power plants generally have complete flue gas treatment systems, of which the desulfurization system is an important component. Because of its high desulfurization efficiency, mature technology, compact equipment layout, and strong adaptability to water quality changes, the limestone-gypsum wet flue gas desulfurization technology has become the mainstream treatment process for power plant flue gas desulfurization in China. In the wet flue gas desulfurization process, as the absorption reaction continues, the concentration of Cl- in the slurry gradually increases. Excessive Cl- concentration, on the one hand, affects the desulfurization efficiency; on the other hand, it affects the quality of gypsum and can also cause pipeline corrosion. In order to maintain the stable operation of the absorption system and ensure the quality of gypsum products and desulfurization efficiency, it is necessary to control the Cl- concentration in the slurry, generally requiring it to be below 20000 ppm, so it is necessary to continuously discharge part of the slurry. Although the amount of desulfurization wastewater is a small proportion of the wastewater in the power plant, it is characterized by high salt content, many types of pollutants, large water quality fluctuations, high turbidity, and high hardness, making it the most complex and difficult wastewater to treat in coal-fired power plants. Project Overview The power plant project is a newly built 2×1000MW ultra-supercritical coal-fired power generation unit, with two sets of limestone-gypsum wet flue gas desulfurization units and their public systems built simultaneously. This project requires zero discharge of desulfurization wastewater, with a designed treatment capacity of 25 m³/h, and a total TDS value of 40000-60000 mg/L under harsh conditions. The overall zero-discharge system mainly includes two parts: low-temperature flash evaporation and concentration + bypass flue gas spray drying. Hezhongsi (Beijing) Environmental Engineering Co., Ltd. (hereinafter referred to as Hezhongsi) is responsible for the design of the process package (Hezhongsi®HLTC), the supply of complete sets of equipment, and technical services for the low-temperature flash evaporation and concentration process section. Design Goals 01 Desulfurization wastewater zero-discharge system processing capacity ≥25 m³/h 02 Annual equivalent availability factor [(available hours - equivalent downtime hours due to reduced output)/total hours in the statistical period]: not less than 95% 03 Annual operating time under the principle of orderly power use: 6000 hours 04 Ensure that the noise level measured at a distance of 1 m from the equipment (including insulation) and the outer casing is no more than 85 dB(A) 05 System output loss shall not exceed 20% during the equipment life cycle 06 The quality of produced water meets the water replenishment requirements of the desulfurization process Process Description 3D model of low-temperature flash evaporation and concentration unit The low-temperature flash evaporation and concentration treatment technology for wet desulfurization wastewater (Hezhongsi®HLTC) is based on the principle of gypsum crystal seed technology. Hezhongsi has made a large number of creative improvements, such as adjusting process parameters and optimizing equipment structure, to maximize the delay or elimination of scaling and salt accumulation inside the evaporator. Internal condition of the evaporation heat exchanger after three months of operation Core equipment: The core equipment of the low-temperature concentration system is a three-effect forced circulation evaporation unit, operating under vacuum conditions, with a water recovery rate of up to 90%. Heat source: The heat source for low-temperature flash evaporation and concentration is taken from the flue gas waste heat after the induced draft fan, without increasing new energy consumption. Superheated steam is used as a backup heat source. Cooling water: The system has its own complete cooling circulating water system, requiring only a small amount of water replenishment, without drawing circulating water from the plant system, and does not affect the operation of the main unit. Wastewater process: The supernatant liquid of the wastewater hydrocyclone enters the buffer tank, and is directly pumped into the first-effect evaporator by the wastewater feed pump. Under the action of the forced circulation pump, the wastewater is heated by the first-effect heat exchanger and then enters the first-effect separation chamber to complete gas-liquid separation. The preliminary concentrated liquid enters the second effect for further concentration, and the final concentrated liquid is discharged from the third effect, and is pumped into the bypass flue gas spray drying system by the discharge pump. Steam/condensate process: The heating steam enters the first-effect heating chamber, releases heat after condensation, and is pumped out of the system for reuse by the front-end condensate pump. The secondary steam generated by wastewater evaporation is finally condensed and collected into the tail-end condensate tank, and is sent to the desulfurization process water tank or used as supplementary water for circulating cooling water by the tail-end condensate pump. Process Characteristics 01 The concentration system operates under negative pressure and low temperature, which can effectively prevent or reduce equipment corrosion. 02 No pretreatment is required, no reagent cost consumption, no solid salt production, and low operating cost. 03 The heat source for low-temperature flash evaporation and concentration is flue gas waste heat, without increasing new energy consumption. 04 The entire system has few equipment and a short process, resulting in low investment cost. On-site Situation Location of the flash evaporation system System side view System front view Details Summary The zero-discharge project for desulfurization wastewater of the 2×1000MW unit of the National Energy Power Plant is currently in operation. The low-temperature flash evaporation process section (Hezhongsi®HLTC) undertaken by Hezhongsi has been operating stably since commissioning and has been fully affirmed by the owner and general contractor.

2021

< 1...40 41 42...51 >

Address: 3rd Floor, Building C15, Phase II, Dongyi International Media Industrial Park, Chaoyang District, Beijing

After-sales service hotline: +86 400 880 7573

Tel:+86 1051659602/+86 010 51659603

Email:mkt@horwater.com

Scan with WeChat

Horwater Environment (Beijing) Co., Ltd.

Business License

中企跨境-全域组件制作前进入CSS配置样式

图片alt标题设置： Horwater Environment (Beijing) Co., Ltd.

表单验证提示文本： Content cannot be empty!

循环体没有内容时： Sorry,no matching items were found.

CSS / JS 文件放置地