Waste burning

Waste Incineration
The project involves the investment in three waste incinerators. Specifically: Phase 1 includes the investment in one IV-203-300 incinerator with a capacity of 300 kg/hour. This incinerator is manufactured in Japan and the technology was transferred to THANH TUNG 2 factory, making it the first incinerator technology of its kind in Vietnam.

Phase 2: An additional IV-203-300 incinerator with a capacity of 300 kg/hour and one rotary kiln incinerator model LQ-1000 with a capacity of 1 ton/hour are invested.

IV-203-300 Incinerator, Capacity 300 kg/h

Technological Process

The technological process of the IV-203-300 waste incinerator is presented below.

Operating Principle Diagram of the IV-203-300 Incinerator

Technology Scale and Technical Specifications

a) Fuel Characteristics

The fuel used in the project consists of industrial solid waste (ISW) and hazardous waste (HW), including:

Mixed industrial solid waste
Solid waste from wood processing, rubber, and paper industries
Oil-contaminated solid waste, paint sludge, and chemical packaging

The list of waste types that can be incinerated is presented in Table 1.13.

Table 1.13: List of Waste Types Suitable for Incineration in the IV-203-300 Incinerator

No.	Waste Type	State	HW Code
1	Tar and waste coal	Solid	01 04 06 / 11 03 02
2	Solid waste containing paint or varnish with organic solvents or other hazardous components	Solid	08 01 02
3	Solid waste containing oil from maintenance activities of facilities, machinery, equipment	Solid	01 04 05 / 01 04 07
4	Solid waste containing hazardous Silicon	Solid	02 08 01
5	Solvents from wastes containing solvents, varnish	Solid	07 01 06
6	Ink and waste from printing	Solid	08 02 04
7	Solid waste from wood processing, paper and pulp industry containing hazardous components	Solid	09 01 01
8	Leather waste containing hazardous substances from tanning processes	Solid	10 01 02
9	Combustible solid waste containing hazardous components	Solid	03 04 09 / 06 01 07 / 12 02 05 / 12 03 02 / 12 04 02 / 12 09 01 / 17 05 01
10	Solid waste containing infectious agents	Solid	13 01 01
11	Waste containing residual pesticides	Solid/sludge	14 01 01
12	Waste containing residual herbicides	Solid/sludge	14 01 02
13	Expired or unused plant protection chemicals	Solid	14 01 04

Source: Investment Project, 2012.

Rotary Kiln Incinerator LQ-1000

Operating Principle of the LQ-1000 Incinerator

The basic principle of a rotary kiln incinerator system includes the following components: waste feeding unit, primary chamber (rotary kiln) with a volume of 9.5 m³, secondary chamber (static furnace) with a volume of 4.75 m³, and an ash removal system.

The rotary kiln incinerator's primary chamber is a rotating drum with adjustable speed, responsible for mixing the solid waste during combustion. The incinerator is installed at a slope of approximately 1/100 to allow automatic movement of the waste from the feeding point to ash discharge. The drying, vaporization (pyrolysis), carbon combustion, and ash removal processes occur in this rotary drum sequentially from the waste being fed into the combustion chamber until it turns to ash.
The secondary combustion chamber is a static chamber designed to burn the volatile substances and gases generated from the pyrolysis process in the primary chamber. The operating temperature ranges from 950°C to 1300°C. The gas retention time in the secondary chamber is maintained at 2 seconds to comply with QCVN 30:2010/BTNMT standards. The minimum excess oxygen required for combustion is 6%. The secondary chamber is often integrated with an energy recovery system such as a boiler (for generating high-pressure steam to drive turbines or produce hot water, etc.).

Diagram of the LQ-1000 Rotary Kiln Incinerator

Trong đó:

Symbol	Description (Vietnamese)	Symbol	Description (English)
①	Cầu trục nâng rác	…	Primary burner nozzle
,	Phễu nhận rác	†	Boiler
ƒ	Buồng đốt thùng quay	‡	Ash conveyor
„	Buồng đốt thứ cấp	^	Ash bin

1) Technology Process

The technological process of the rotary kiln incinerator is illustrated in .S

Rotary Kiln Technology Diagram

Technology Scale and Technical Specifications

a) Technical Specifications

The technical specifications of the LQ-1000 kiln are shown in

Technical Specifications of the LQ-1000 Kiln.

No.	Specification	Value
1	Type of burner	Rotary kiln
2	Capacity	1,000 kg/hour
3	Thermal power	2,000,000 kcal
4	Primary combustion chamber volume	4.75 m³
5	Primary chamber temperature	700 – 900°C
6	Secondary combustion chamber volume	20.19 m³
7	Secondary chamber temperature	≥ 1,050°C
8	Gas retention time	> 2 seconds
9	Re turbulence number	7,000
10	DO oil fuel consumption	140 – 300 kg/h
11	Power consumption	3 phase, 80V; 48 (KWh)
12	Exhaust gas flow rate	10,500 – 12,500 N.m³/h
13	Exhaust gas temperature to environment	< 200°C
14	Exhaust gas velocity	20 – 25 m/s