Medical waste incinerator - rotary kiln type - processing equipment

1.A set of medical waste incinerators, rotary kiln type, designed for a daily processing capacity of 15 tons.

Rotary Kiln Incineration Medical Waste Centralized Disposal Project

 Scope of Application:

1. Centralized treatment of industrial waste.

2. Treatment of sludge and paste-like waste.

3. Centralized treatment of medical waste.

Product Features:

1. This equipment can simultaneously incinerate solid waste, liquids, colloids, and gases, demonstrating strong adaptability to various waste types.

2. The incineration material tumbles and moves forward, featuring three concurrent heat transfer methods in a single furnace, resulting in high thermal efficiency.

3. High-temperature materials contact refractory materials, allowing for easy and cost-effective replacement of furnace linings.

4. The drive mechanism is simple, with the transmission device located outside the kiln shell, making maintenance straightforward.

5. There are no stringent requirements for the shape or moisture content of the waste.

6. The rotary kiln allows for a retention time of over 1 hour at temperatures above 900°C, ensuring the thorough incineration of hazardous waste. The intense mixing in the secondary combustion chamber allows unburned components in the flue gas to combust completely, reaching the high temperatures (1100°C) necessary for the decomposition of harmful substances. The residence time in the high-temperature zone is 2 seconds; this not only ensures complete combustion of the incinerated residues but also minimizes or avoids conditions that produce dioxins at the source.

7. Excellent sealing measures and negative pressure in the furnace chamber ensure that harmful gases do not escape.

8. The equipment operates at a high rate, with an annual operational rate typically reaching 90%; it is easy to operate and maintain.

9. The high-temperature zone of the kiln body is made from SUS310S heat-resistant stainless steel, ensuring long-term stable operation.

Product Overview:

The rotary incineration kiln is widely used in the international industrial waste treatment sector, holding approximately 85% market share in industrial waste incineration. It is also recommended as a model by the Ministry of Science and Technology and the National Environmental Protection Agency in China's national industrial waste treatment technology policy, capable of treating both solid and liquid waste. Solid waste is delivered into the rotary kiln via specialized conveying equipment, where it undergoes moisture evaporation, volatile matter release, ignition, and combustion processes. The ash is discharged from the kiln's tail, and the resulting flue gas enters the secondary combustion chamber, where it mixes with secondary combustion air to achieve complete combustion, ensuring safe and compliant emissions.

As a primary incineration device for waste, the rotary kiln allows waste to progress through three stages: preheating and ignition, combustion, and reduction, facilitating waste decomposition. The main components of the rotary kiln include: the kiln body made from rolled steel plates, lined with refractory materials that are acid-resistant, wear-resistant, high-temperature resistant, and able to withstand thermal cycling stress. The interior of the kiln tail is equipped with heat-resistant steel plates, while the kiln head and tail feature sealing devices. The rotary kiln incorporates a variable frequency drive system, a gear drive system, and has an inlet for feeding materials, as well as points for temperature measurement, burner ports, waste liquid injection ports, observation ports, and more. The kiln body, also known as the primary combustion chamber, is designed with a cylindrical structure; its shell is constructed from steel plates, lined with lightweight insulation materials to effectively minimize heat loss. The inner wall is built with high-alumina refractory materials, allowing for reliable operation at high temperatures. Due to the rotation of the cylinder, waste mixes thoroughly with air, resulting in rapid gasification and high incineration rates.

Characteristics of the Rotary Kiln Incineration Furnace:

1. This equipment can simultaneously incinerate solid waste, liquids, colloids, and gases, demonstrating strong adaptability to various waste types.

2. The incineration material tumbles and moves forward, featuring three concurrent heat transfer methods in a single furnace, resulting in high thermal efficiency.

3. High-temperature materials contact refractory materials, allowing for easy and cost-effective replacement of furnace linings.

4. The drive mechanism is simple, with the transmission device located outside the kiln shell, making maintenance straightforward.

5. There are no stringent requirements for the shape or moisture content of the waste.

6. The rotary kiln allows for a retention time of over 1 hour at temperatures above 900°C, ensuring the thorough incineration of hazardous waste. The intense mixing in the secondary combustion chamber allows unburned components in the flue gas to combust completely, reaching the high temperatures (1100°C) necessary for the decomposition of harmful substances. The residence time in the high-temperature zone is 2 seconds; this not only ensures complete combustion of the incinerated residues but also minimizes or avoids conditions that produce dioxins at the source.

7. Excellent sealing measures and negative pressure in the furnace chamber ensure that harmful gases do not escape.

8. The equipment operates at a high rate, with an annual operational rate typically reaching 90%; it is easy to operate and maintain.

9. The high-temperature zone of the kiln body is made from SUS310S heat-resistant stainless steel, ensuring long-term stable operation.

Product Project (Sanming) Introduction:

Medical waste refers to waste generated by medical and health institutions during medical prevention, healthcare, and other related activities, which has direct or indirect infectious, toxic, or other hazardous properties. It is mainly categorized into five types: infectious waste, pathological waste, injury waste, chemical waste, and pharmaceutical waste.

This project intends to establish a medical waste disposal facility with a capacity of 7.5*2T/D, utilizing two processing units for the incineration of medical waste. The technical proposal for this incineration project includes the procurement, installation, and commissioning of two hazardous waste incinerators. The entire system comprises the incinerators and their associated waste feeding facilities, flue gas treatment system, ash removal system, automatic control system, interlock alarm system, emergency discharge system, and online monitoring system.

Main Design Indicators:

Incinerator Type: Rotary Kiln + Secondary Combustion Chamber

Incinerator (Secondary Combustion Chamber) Temperature: ≥1100℃

Flue Gas Residence Time: ≥2s

Incineration Efficiency: ≥99.9%

Destruction Removal Efficiency: ≥99.99%

Heat Loss Rate of Incineration Residue: <5%

Incineration Capacity:

Overload Capacity: 20%

The refractory material for this rotary kiln is made of chrome corundum castable material and corundum bricks, with a thickness of no less than 300mm; the chromium content in the chrome corundum is not less than 3%, and the corundum content is not less than 85%.

Brief Description of the Main Process Flow:

1. First, turn on the air blower to clear any residual gases and other flammable and explosive gases from the kiln, preventing explosions during ignition.

2. Before igniting the burner, turn on the induced draft fan to purge the furnace chamber for five minutes. Natural gas, as a combustion aid, is delivered through pipelines and ignited by the ignition burner. The heat generated by the burner gradually raises the temperature inside the rotary kiln and the secondary combustion chamber.

3. Solid waste is fed into the rotary kiln through the feeding system, and the combustion temperature is controlled at 850°C by regulating the supplementary oxygen supply. Liquid waste enters the rotary kiln or the secondary combustion chamber through the liquid waste piping.

4. The flue gas produced by the rotary kiln enters the secondary combustion chamber, and the ash generated from combustion is automatically discharged by a wet scraper.

5. The flue gas from the combustion is further burned at high temperatures in the secondary combustion chamber using organic liquid waste as a combustion aid, raising the combustion temperature to 1100°C. This ensures more complete incineration, achieving smoke-free, odorless results with no secondary pollution. The flue gas remains in the secondary chamber for 2.0 seconds, allowing for the complete decomposition of trace organic substances and dioxins, with a decomposition efficiency exceeding 99.99%, ensuring that any undecomposed organic components and carbon particles are completely decomposed at around 1100°C. A multi-stage combustion process in the secondary chamber effectively suppresses the generation of nitrogen oxides.

6. The flue gas exiting the secondary combustion chamber enters a waste heat steam boiler, where 10% urea is injected for high-temperature SNCR (Selective Non-Catalytic Reduction) denitrification to remove NOx from the flue gas. The high-temperature flue gas exchanges heat with the evaporator tube bundle in the boiler, producing saturated steam that enters the factory pipeline. Meanwhile, the ash in the flue gas further settles in the boiler cavity, improving the cleanliness of the flue gas.

7. The flue gas from the boiler enters a semi-dry quenching tower. It is transported by a pressurized pump and sent into the reaction tower through a dual-fluid nozzle at the top, where it is atomized into fine droplets. The atomized droplets are affected by the rising hot flue gas, creating a high-density region with suspended droplets near the nozzle. By adjusting the injection amount, the temperature is rapidly reduced to around 200°C within 1 second, effectively suppressing the reformation of dioxins. Additionally, some sparks in the flue gas are extinguished by the injected water mist, protecting subsequent filter bags from damage.

8. The flue gas then enters a dry acid and dioxin absorption device, equipped with storage tanks for lime and activated carbon. The lime and activated carbon are conveyed by a star valve and blown in with high-pressure air, reacting with the flue gas to further purify it. The role of the lime is to remove acidic components such as HCl and NOx from the flue gas, while the activated carbon serves to adsorb and remove trace amounts of dioxins.

9. The flue gas enters a baghouse dust collector, removing fine dust particles that remain in the flue gas. The mixture of lime and activated carbon sprayed in the dry spray tower enters the baghouse, adsorbing on the bags, and any unreacted lime and activated carbon continue to absorb and react. The dust collector is equipped with a bypass duct; when the inlet temperature of the baghouse is outside the limit range, the bypass electromagnetic valve opens, allowing the flue gas to bypass the bags into the chimney, ensuring that abnormal flue gas temperatures do not cause catastrophic damage to the bags.

10. The flue gas exiting the baghouse enters a spray washing tower and a wet packing washing tower, whose primary function is to wash away acidic gases from the flue gas.

11. The purified flue gas then continues into a flue gas reheater, where high-temperature steam is used to reheat the already cooled flue gas. When the temperature exceeds 130°C, it can be directly discharged into the chimney.

2.A medical waste incinerator, rotary kiln type, designed to process 15 tons per day.

3.A set of medical waste incinerators, rotary kiln type, designed for a daily processing capacity of 20 tons.