Solid waste gasification

Municipal solid waste gasification power generation device is mainly composed of five parts: material crushing feeding mechanism, waste gasification device, gas purification device, gas generating unit, control device, and auxiliary facilities such as wastewater treatment system, tail gas treatment system and tail slag treatment system.

  • Material crushing feeding mechanism:

    Material crushing is mainly to cut large pieces of waste into small particles, which is convenient for feeding and gasification. There are many kinds of feeding mechanism. According to the size of the site, they are spiral feeder, belt feeder and bucket feeder. The power equipment is electromagnetic speed regulating motor. The feeder is convenient for continuous and uniform feeding, and the electromagnetic speed regulating motor can adjust the biomass feeding at will.

  • Gas Generating Device:

    Gasification device adopts sealed continuous operation gasification heating furnace, which is composed of sealed device, gasifier and slag discharging mechanism. The waste is pyrolyzed and gasified at low temperature in the gasifier to produce flammable gas. The flammable gas is sent to the gas purification unit for purification to meet the needs of gas generators. The remaining ash is discharged out of the gasifier in time by the slag discharging device.

  • Gas Purification Device

    Gas needs to be purified before it can be used for power generation. Gas purification includes dust removal, ash removal and tar removal. In order to ensure the purification effect, the device can adopt multi-stage dust removal technology, such as inertial dust collector, cyclone separator, Venturi tube dust collector, condenser and so on. After multi-stage dust removal, the solid particles and fine dust in the gas are basically cleaned up, and the dust removal effect is more thorough; tar in the gas is removed by adsorption and water washing, and the main equipment is two in series. Spray scrubber.

  • Gas-fired power generation device

    Gas-fired turbines can be used to drive generators to generate electricity. At present, the maximum power of gas-fired internal combustion engines in China is 500 kW, 800 kW and 1000 kw, so the generator system larger than 1000 kW can be composed of several 1000 kW generators in parallel.

  • Control device

    It consists of PLC central control room, electric control cabinet, thermocouple and temperature display meter, pressure gauge and air flow control valve. Personalized design can be carried out according to the actual needs of users.

  • Wastewater treatment system

    Wastewater is treated by filtration, adsorption, biological treatment or chemical or electrocoagulation methods. The treated wastewater can be recycled.

  • Waste gas treatment system

    Multi-stage dust collection device, filter device and spray device are used to remove sulfide, nitrogen oxides and dust in gas.

  • Waste Slag Processing System

    According to customer needs for tailings landfill, brick production and other building materials.

Solid waste gasification process flow chart

Waste gasification refers to the gasification and pyrolysis of waste gasification raw materials after crushing, drying and processing, which are fed into the gasifier under the condition of less oxygen. That is to say, under certain thermodynamic conditions, organic matter in waste is pyrolyzed, oxidized, reduced and reformed. Tar associated with pyrolysis is further pyrolyzed into small molecular hydrocarbons under the action of catalysts to obtain hydrocarbons containing CO, H2 and hydrogen. The process of obtaining product gas by purifying combustible gases such as CH4.

Process flow chart

Solid waste gasification technical feature

Rapid disposal

It takes only 3 minutes for domestic waste to enter the pyrolysis gasifier to generate electricity.

Utilization of resources

After pyrolysis and gasification of municipal solid waste, the combustible gas generated can drive the gas turbine to generate electricity. Solid waste can be made into building materials.

Environmental protection

The whole process of treatment is closed to achieve cleaner production.There is no liquid and solid emissions, and the combustion exhaust purified to meet the standard emissions.

Easy transportation and installation

Skid-mounted mobile design, flexible layout.It Can be placed in the source of garbage to achieve the requirements on-site treatment .

Harmless treatment

Waste is treated by pyrolysis and gasification ,it can kill all kinds of harmful bacteria and remove odor 100%.The pyrolysis and gasification process is in an anaerobic reduction environment, which effectively inhibits the production of dioxin, hydrogen sulfide and other harmful gases, and achieves the standard exhaust emission.

High degree of automation

The system uses PLC control, interlocking, automatic alarm in case of failure; automatic detection of linkage feeding, gasification, slag discharge, gas emissions; the  operation of system is easy to understand, one person on duty, safe and reliable.

Technical comparison

Comparison of advantages between fixed bed gasification technology and rotary distillation gasification technology

Current status of waste gasification technology Main Problems of Gasification Technology in Fixed Bed Advantages of Rotary Dry Distillation Gasification Technical
Fixed bed gasification belongs to fluidized bed technology of vertical furnace. It is easy to produce coking and caustic corrosion in practical application. Rotary retorting gasification technology has the advantages of uniform heating of fuel, non-coking, precise automatic control of pyrolysis condition parameters (time/temperature), reliable operation of the system and high gasification efficiency.
Carbon content of slag and fly ash in gasification process is high and gasification efficiency is low.
The contentof tar in gas is high, which affects the stability of power generation equipment and it is easy to produce coke-containing wastewater Adoppting advanced technology of gas purfication and coke removal .Gas meets the requiement of gas power generatio system,and cocke-containing wastewater is discharged zero

The effect of Waste heat utilization  is not good, resulting in the overall efficiency of the system is low

The waste heat of system  can be used in cascade by circulating cooling system and waste heat recovery equipment, and the energy  efficiency of system is 75%

Parameter Table of System Capability

The solid waste gasification runs for 8000 hours a year. Gasification equipment and power generation equipment are installed in 40GP containers respectively. Gas purification treatment devices are installed on the top of the containers. It is convenient to transport, occupies less land and has strong adaptability, and is not affected by urban planning.

Distributed Domestic Waste Energy Utilization
Capacity/Day 50~60Ton 60~80 Ton 80~100 Ton
System configurationGeneration power/h 500kW 800kW 1000kW

800kW System Capability Parameter Table

No. Item Unit Value of number Note
1 Fuel consumption tons/year 20,000
2 Gas output Nm3/Year 1,760,000 Calorific value of gas:1100~1300kcal/Nm3
3 Annual capacity kWh/Year 6,400,000 When all gas is used for power generation
4 Steam production Ton/Year 2560 Combined heat and power generation

Gas quality control

The highly clean gas generated by solid waste gasification meets the use requirements of gas-fired power generation equipment and ensures the stable and reliable operation of the system.

Gas quality Internal combustion engine requirements
Impurit granularity 5μm 5μm
moisture content ≤10mg/Nm3 ≤40mg/Nm3
Impurity content 10mg/Nm3 30mg/Nm3
Gas temperature ≤40℃ ≤40℃
Tar content 10mg/Nm3 50mg/Nm3
Calorific value of gas ≥4.2MJ/Nm3 ≥4MJ/Nm3

Exhaust emission

The exhaust pollutant content of the system is far below the international and domestic standards. Contrast with the strictest Beijing standards in China.

Contrastive Basis: Beijing Boiler Air Pollutant Emission Standard DB11/139-2015

Contaminant Content of System Exhaust Gas Beijing Standard
NOx20mg/Nm3 NOx30mg/Nm3
SO2≤5mg/Nm3 SO2≤10mg/Nm3
particulate matter5mg/m3 particulate matter5mg/m3
Dioxin Not produce

Pictures of solid waste gasification and power generation equipment

Domestic Waste Gasification Equipment
Domestic Waste Gasification and Power Generation Equipment
Municipal solid waste gasification power generation device