Garbage incineration smoke and dust

The control of flue gas from household waste incineration is to control the exhaust gas generated by household waste incineration power generation (heating) plants to ensure compliance with emission standards.

Sources and components of incineration flue gas

The exhaust gas emitted by domestic waste incineration power generation (heating) plants mainly comes from the flue gas generated by the incinerator, which contains major pollutants such as dust, hydrogen chloride, sulfur dioxide, nitrogen oxides, carbon monoxide, hydrogen fluoride, organic pollutants, dioxins, and heavy metals.

Incineration smoke control

The smoke control standards for household waste incineration are stricter than those for industrial kilns such as coal-fired boilers, oil fired boilers, and coking furnaces.

By using a computer control system to achieve high automation of processes such as waste incineration, thermal energy utilization, and flue gas treatment, the incineration system can operate under rated conditions, thereby minimizing the concentration of raw emissions. After the flue gas is treated by the flue gas purification system and discharged into the atmosphere through the chimney, an online flue gas monitoring device is used to continuously monitor the flue gas emission indicators of each incineration line, ensuring that the flue gas emissions of the waste incineration power generation (heating) plant meet the standards.

The incineration of household waste has become a common problem in today's society. During these incineration processes, a large amount of incineration flue gas is generated. The application of waste gas treatment equipment has become a concern for us. The composition of these flue gases is relatively complex, mainly consisting of smoke, acidic gases, heavy metals, and dioxins. These household waste incineration fumes seriously damage the air quality.

The treatment of incineration flue gas is generally divided into the removal of smoke and dust, the removal of heavy metals and dioxins, and the removal of acidic pollutants. Among these removal methods, they are further subdivided into many subcategories, the most important of which is the combination process of exhaust gas treatment equipment. The combination process can make the purification of incineration flue gas meet the standards, but the process is more complex and accompanied by sewage treatment problems.

Introduction to the removal process of smoke, heavy metals, and dioxins.

1.1 Removal of smoke and dust (mainly using dust collectors for smoke and dust removal)

1.2 Removal of heavy metals and dioxins (mainly using activated carbon injection+bag filter)

1.3 Removal process of acid pollutants (mainly wet method and mechanical rotary spray semi dry method)

1.3.1 Dry process (Dry deacidification process is to lift up alkaline deacidification and directly spray it into the flue, with a simple process or using NSK process)

1.3.2 Wet process (Wet deacidification uses alkaline adsorbents to remove acidic gases such as HC1 and SO2 in the washing tower)

1.3.3 Semi dry process (mainly using rotary atomizer semi dry process, fixed nozzle semi dry process, and circulating fluidized bed semi dry process)

1.3.4 Combination process (mainly referring to the combination process of semi dry and dry flue gas deacidification)

1.3.5 Other removal processes (Due to the advantages and disadvantages of acid gas removal processes, the determination of flue gas acid removal processes should comprehensively consider factors such as flue gas emission standards, waste composition, investment and operating costs of waste gas treatment equipment, system stability, etc.)

We generally choose non catalytic reduction technology and selective catalytic reduction technology for NOx control in incineration flue gas.

The composition of incineration flue gas is relatively complex, and the previous flue gas treatment equipment (exhaust gas treatment equipment) combination of "SNCR+semi dry process+activated carbon injection+bag filter" can meet the current pollutant emission standards. However, with the continuous improvement of environmental protection requirements, research is needed in various aspects.