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Core Technology Introduction
Development and Application of Waste Incineration Technology
Clean Incineration
  • Key Technology of Large-scale Mechanical Grate
    Key Technology of Large-scale Mechanical Grate Furnace

    Large-scale grate furnace generally refers to an incinerator with a single line rated processing capacity of 750t/d and above, which is mainly composed of an incinerator grate and a combustion furnace. SUS Environment, which has a firm grasp of core technology, has successively developed 750-ton, 850-ton, 1,000-ton and other super-large grate, constantly refreshing the industry's single-grate scale record.

    The 1000t/d-grate developed by SUS Environment is the first ultra-large incinerator grate in China and has already been put into use in the Sanhe Project in 2021. The super-large grate will continue to consolidate the domestic performance of SUS grate, and at the same time will promote the further development of SUS's overseas business.

    Technology Application

    With its excellent performance, SUS's large-scale grate furnace technology has been widely recognized by the market. As of December 2021:

    495

    more than 495 sets of incineration lines

    160000

    The total scale of waste disposal is nearly 160,000 tons/day

    40%

    The market share of large-scale grate exceeds 40%

    The Ningbo Project adopts SUS 750-ton large reciprocating cascade moving grate, which has sufficient combustion, high equipment reliability and long grate life.

    9 modules, 18 wind chambers, easy to install and operate.

    The moving and static columns of the grate are alternately arranged longitudinally, with less wear and long life.

    Column movement and drop walls are designed to enhance the mixing of waste, and it is divided into modules to push materials and divided air distribution to effectively improve the uniformity of combustion.

    The combustion is stable and sufficient, the flue gas CO content is low, and the dioxins are well controlled.

  • The Third Generation of Automatic Combustion Control Technology
    The Third Generation of Automatic Combustion Control Technology (ACC)
    The complex composition and uneven calorific value of domestic waste can easily cause large fluctuations in the primary and secondary air volume, steam output, and flue gas pollutant concentration required for waste combustion. For new problems such as uniformity, difficulty in combustion adjustment, and increased combustion fluctuations, SUS has developed an automatic combustion control system (Automation Combustion Control, ACC system) suitable for large-scale grate furnaces.
    ACC Technology Continues to Upgrade
    SUS Environment continues to upgrade the world's leading automatic combustion control technology (ACC) to ensure stable combustion and ultra-low emissions. The third-generation ACC system and the combustion imaging recognition system are jointly controlled, which further reduces human intervention, promotes the stable and efficient operation of the incinerator, and improves the commissioning rate of the ACC system.
    Benefits and Technology Application
    The third-generation ACC technology builds a technical system that integrates furnace temperature control, flame status determination and other automatic control technologies, which further improves the fluctuations in the large-scale grate waste incineration process and improves the operational stability of the large-scale grate furnace.

    Real-time monitoring and adjustment of the combustion status in the incinerator;

    The main steam flow of the boiler is stable at the set value;

    The thickness of the waste material layer is stable;

    The burning position is appropriate, the heat loss is minimized, and the waste is completely burned;

    The temperature in the furnace is stable and the pollutant emission is low;




  • Efficient Waste Heat Utilization Technology
    High Parameter Waste Heat Boiler Technology
    The heat generated by waste combustion is recovered by the waste heat boiler to produce superheated steam, which is used for the steam turbine to generate electricity. The steam parameter of the waste heat boiler is a key factor that affects the thermal efficiency and power generation efficiency, and is directly proportional to the thermal efficiency and power generation efficiency. SUS Environment successfully developed a waste heat boiler with high steam parameters, which improved the thermal efficiency and power generation efficiency of the incineration plant, and ensured the long-term stable operation of the boiler.
    Benefits and Technology Application
    The use of medium-temperature sub-high pressure and sub-high temperature and sub-high pressure parameters increase the efficiency by 15.07% and 16.68%, respectively, compared with the medium-temperature and medium-pressure parameters.

    (Note: According to the 3×750t/d incineration line with 2 steam turbine generator sets, it is assumed that the efficiency of the waste heat boiler with various parameters is the same, and the steam turbines all use high speed.)

    No. Main Steam Temperature/Pressure
    		 Medium-temperature/Medium-pressure
    		 Medium Temperature/Sub-high Pressure
    		Sub-high Temperature/Sub-high Pressure
    01 Increase in power generation per ton of waste Reference Value 15.0% 16.7%
    02 Increase in electricity bill revenue Reference Value 14.3% 14.3%
    Classic Projects
    High-parameter boiler technology has been applied in Ningbo, Zhuhai, Shenyang, Xi'an, Guangshui, Sanhe and other projects of SUS Environment, and has achieved good environmental and economic benefits.
    Ningbo Project (2250tons/day)
    Xi'an Gaoling Project (2250tons/day)
  • Flue Gas Purification Treatment System



    Three-time air low nitrogen combustion based on the air classification combustion technology, is being verified in the real furnace of projects such as Guangshui, and has achieved good results, reducing NOx generate.


    Guangshui project (600 tons/day)



  • Tertiary Air Low-nitrogen Combustion Technology
    Flue Gas Purification Treatment System
    The flue gas produced by waste incineration is discharged with reaching the standard after dust removal, deacidification, denitration, and removal of dioxin and heavy metals. ---"SNCR + Semi-dry Process + Dry Process + Activated Carbon Injection + Bag Dust Removal" is currently the most mainstream flue gas purification process in domestic waste incineration plants. All projects of SUS Environment will add flue gas treatment processes such as SCR or GGH on the basis of the "five-step method" to ensure that the emitted flue gas is clean and pollution-free.
    " Seven-step Method "for Flue Gas Purification
    The Ningbo project adopted the most stringent "seven-step" flue gas purification combined process in China at the time. The average value of dioxin measured in 2018 was only 1/10 of the EU 2010 standard.

    Deacidification Three Times

    Semi-dry Method + Dry Method + Wet Method

    Dust Removal Twice

    Bag Dust Collector + Wet Scrubber

    Denitrification Twice

    SNCR+SCR

    Dioxin Removal Twice

    Activated Carbon Injection + SCR
    Continuous upgrading of flue gas purification technology-the pursuit of extreme clean emissions
  • Simulation Technology



    The simulation system has been applied in the Ningbo Project, which has good controllability and flexibility, and is not restricted by weather conditions and sites.


Resource Recycling
  • Collaborative Technology of Eco-industrial Park
  • Industrial Wastewater Treatment Technology


    The industrial waste water of waste-to-energy plant includes circulating water sewage, demineralized water, boiler sewage, etc. The industrial wastewater treatment process of SUS Environment adopts "Regulating tank + Chemical softening + Tubular Ultrafiltration Filter (TUF) + Reverse Osmosis (RO), the dope adopts high-pressure reverse osmosis (DTRO) to further reduce the amount of the solution”. This program has a high water production rate, the overall recovery rate is greater than 85%, and the effluent quality meets the "Urban Sewage Recycling--Industrial Water Quality Standard".


    Ningbo Sewage Treatment and Recycling

  • Leachate Concentrate Reduction and Reuse Technology



    The leachate treatment system independently developed by SUS adopts multiple high-tech processes such as pretreatment, anaerobic fermentation, membrane bioreactor, nanofiltration, reverse osmosis, etc. The treated reclaimed water can meet relevant national standards and can be used as circulating cooling water.



  • Sludge Synergy Technology


    The sludge and domestic waste are co-incinerated, and the municipal dewatered sludge is dried first, reducing the moisture content of the sludge entering the furnace, increasing the calorific value of the sludge entering the furnace, and sending it to the waste incinerator for coordinated incineration. The sludge is co-processed by using waste incineration mixed with dried sludge.


    Qingdao Xiaojianxi Phase II Waste-to-Energy and Sludge Co-processing Project (domestic waste 2250t/d, sludge 500t/d)

  • Collaborative Treatment Technology of Construction Waste


    Construction waste refers to all kinds of wastes such as spoils and materials generated during the process of new construction, reconstruction, expansion, and demolition of various buildings, structures, municipal pipe networks, and residents' decoration and decoration of houses. According to the source, construction waste can be divided into five categories: engineering muck, engineering mud, engineering waste, demolition waste, and decoration waste. SUS Environment invests in the construction and operation of construction waste treatment projects, focusing on the most complex decoration waste, and can provide all-round solutions for demolition waste, bulky waste, garden waste, mixed waste and other waste.


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