Hazardous waste incineration device project

1.1 The hazardous wastes incinerated in this project include:

Industrial hazardous waste 30t/d.

Liquid waste:30t/d (Only dispose of liquid waste without solid waste); The calorific value is calculated as 5000Kcal; Including preconditioning residue liquid, steam distillation kettle residue liquid, removing light tower, three-effect evaporation residue liquid and water treatment concentrate solution.

20t/d solid waste + 10t/d waste liquid disposal at the same time; Solid waste: the calorific value is calculated as 3000Kcal; Including preconditioning residues, waste activated carbon, distillation residues and water treatment sludge.

Exhaust gas: about 10000Nm3/h; steam distillation tail gas, foul gas, and tank farm exhaust gas,used for solid and liquid dual -use incineratorand secondary combustion chamber to replenish fresh air.

The annual operation time of the incineration device is not less than 300 days,and the continuous operation time of the incineration system is ≥ 2000Hrs.

1.2  Technical index requirements for incinerator

1.3  Main design index

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  Incinerator type: Solid and liquid dual-use incinerator+ secondary combustion chamber

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  Incinerator temperature(secondary combustion chamber)： ≥1100℃

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  Flue gas stay time: ≥2s

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  Incineration efficiency: ≥99.9%

• Removal rate of incineration destroy: ≥99.99%

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  Loss on ignition of incinerated residue: ＜5%

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  Incineration treatment volume:

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  Overload capacity： 20%

• Flue gas emission index:

• The flue gas emission indicator implement the Standard for pollution control on hazardous waste incineration.(draft for the second revision for comments)

  P.S: The required limit of flue gas emission is based on 11％O2（dry gas),if the environment impact assessment approval standards are stricter than the above emission standards, environmental impact assessment approval shall prevail.

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  Noise emission standard requirements：

  Noise emission standards shall comply with class Ⅲ standards in GB12348-2008 Emission standard for industrial enterprises noise at boundary, daytime ≤65 db, night ≤55 db.

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  Burn residue and fly ash discharge requirements:
  Execute as hazardous waste(inorganic).

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  Device is designed for indoor non-explosion proof area.

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  The fuel storage tank and fuel storage tank are placed in the scope of the safe position to meet the fire protection requirements.

According to the characteristics of this project to chosen the solid and liquid dual-use incinerator, can be incinerated solid and liquid at the same time, especially for chemical residues, sludge, organic liquid waste, industrial solid waste, etc. The solid and liquid dual-use incinerator is a cylindrical metal shell in which heat preservation firebricks are laid,the horizontal placement is slightly inclined, through the overall rotation of the furnace body to achieve uniform mixing and move along the tilt angle to the discharge end, the incinerator adopts flue gas forward design.It can ensure that the materials waste are fully heated and the organic matter is fully removed.

As the same time, it is equipped with a secondary combustion chamber, and the exhaust gas generated by the solid and liquid dual-use incinerator is incinerated again at high temperature (1100℃) to ensure the removal efficiency of organic matter, and the selection is made according to the use temperature≥1100℃, the stay time of flue gas ≥2s. The gas after high temperature purification contains a lot of heat can be recycled, this project adopts flue gas waste heat steam boiler to recover heat energy.

After the flue gas is cooled, the tail gas is mainly purified, mainly from the removal of acidic components and nitrogen oxides, the adsorption of harmful components and the collection of dust particles for equipment selection.

Automatic conveying system——Automatic feeding system——Solid and liquid waste incinerator——Secondary combustion chamber——SNCR denitrification system——Membrane wall waste heat boiler——Quench acid removal tower—— Dry spray tower(lime, activated carbon spray)——Bag filter——Induced draft fan——Spray tower——Packing tower——Activated carbon adsorption——Chimney

The operator first turns on the fan and purge the residual gas in the system. Then start the secondary natural gas burner, the natural gas burner attached to the primary combustion chamber (solid and liquid dual-use incinerator), when the inlet of the quenching tower reaches about 150 °C, turn on the washing and spray pump, and the temperature in the kiln rises to about 800 °C, the combustible hazardous waste is sent to the incinerator through the automatic conveying system and automatic feeding system (solid, liquid, gas).The waste in the kiln is dry, pyrolysis and incineration under the auxiliary fuel combustion and air disturbance. The total residence time of the waste in the rotary kiln is 0.5~1.0h, and the entire combustion process is in a negative pressure state.

The flue gas produced after primary combustion (solid and liquid dual-use incinerator) enters the secondary combustion, the secondary combustion chamber is actually a gas combustion furnace. The non -burning long and short chain hydrocarbons compounds and CO and other flammable gases in the flue gas are stirred under the secondary wind, further turbulent mixing. In the "3T+E" environment can be fully burned, so that dioxins substances are completely decomposed. Under normal circumstances, the central furnace temperature of the secondary combustion chamber is above 1100℃, and the design total stay time is more than 2s.The organic hazards in the flue gas are completely destroyed and transformed into CO2, SOX and HCl gases to achieve the purpose of completely sterilization, disinfection and deodorization.

The high temperature flue gas after secondary combustion chamber fully combustion directly enters the membrane wall waste heat steam boiler to cool down to about 400℃, and the SNCR denitrification system (furnace denitrification) interface is provided at the inlet of the membrane wall steam boiler to remove nitrogen oxides. The flue gas enters the quenching deacidification tower, where dilute lye is sprayed to reduce the temperature to about 200 ° C within 1 second to prevent dioxins from being produced again, and then in the dry spray tower is sprayed into slaked lime and activated carbon to remove acid gases such as HCl, SO2, HF and remove heavy metals and dioxins in the flue gas. Then the flue gas enters the bag flier to remove fly ash, waste activated carbon and other particles, the purified flue gas enters the two-stage spray and scrubber tower through the induced draft fan to further purify the acid components and dust. There is a activated carbon adsorption device is provided behind the spray scrubber tower to deeply remove dioxins and heavy metals. Finally, the gas after reaching the standard is discharged through the chimney.