Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

E-45Keywords

Y3

equipment or facility

Z1/2

solid fuels/oil

S5

renewable energy

DConstruction

NIPPON STEEL ENGINEERING CO., LTD.

Waste to Energy Facility (Stoker Furnace)
Features
NSE’s stoker furnace utilizes the heat created during the waste incineration process to generate electricity with aboiler and steam turbine. It has the two main features.
1. Maximizing Energy Recovery … Highly efficient plants
2. Stable Operation When Quality of Waste Changes … Water-cooled fire grate and combustion controlledaccording to changes in quality of waste allows use of high-calorie waste
Maximized Energy Recovery
Catalyst
Reaction
Tower

Turbine Generator

BoilerBag Filter

Stable Response to Changes
in Quality of Waste
StokerFurnace
Main
Ash
High-Efficiency Combustion
Power Generation Technology

Ash Handling
Equipment

Recycling, etc.

Exhaust Gas
ReheaterInducedDraft Fan

To Final Disposal Area

Advance Exhaust Gas/Ash Processing Technology

Basic Concept or Summary
I. Energy Efficient1) Energy Recovery
We have a track record in the highest level of high-temperature high-pressure boilers in the world (90 bar, 500℃ [Naples]), and devote our resources to creating an advanced steam cycle (regeneration cycle, reheatingcycle) and the reduction of heat loss with exhaust gas (low- temperature economizer, gas-gas heat exchanger) in order to achieve maximum recovery of energy (track record of a maximum of 30% or higher).
II. Stability1) Replacement Frequency Reduced and Stable Operation Achieved by Using Different Fire Grate
According to Quality (Grade) of Waste
A water-cooled fire grate is adopted for high-calorie waste, extending the life compared to an air-cooled firegrate. In addition, simplification of the connection between the frame and fire grate reduces problems such aswaste getting stuck and enhances the ease of fire grate replacement work. These and other features enablestable operation.
2) Simple and Highly Reliable Control Accommodate Fluctuation in Quality of Waste
The primary air flow is adjusted to maintain a constant volume of steam (constant steam volume control), andthe volume of waste supplied and fire grate feed rate are adjusted (combustion zone control) in order to maintain a balance between the combustion volume in the furnace and the amount of waste supplied. In addition,
the secondary air volume is adjusted (oxygen concentration control) in order to maintain a constant oxygen
concentration at the boiler outlet.
III. Purity
1) Low Dioxins Emissions
The shape of the secondary combustion chamber and secondary combustion air blowing method are
optimized by utilizing numerical analysis, efficiently agitating and mixing unreacted oxygen and unburned gas/ dust in order to minimize the generation of dioxin.
2) Low Cost HCl and NOX Emissions
A diverse menu of processes allows us to propose a process that meets the needs of the customer.
High-performance dry process technology and catalyst free NOx reduction technology enables the amount ofequipment and volume of reagent used to be reduced, satisfying HCl and NOX regulatory values at a low cost
(initial / running).
IV. Reliability
1) More than 50 years operation & maintenance2) Approximately 500 units delivered

Installation in Practice or Schedule

E-45

DomesticOrders received: 2 sets
6 water-cooled fire grate licenses provided

Overseas

Approximately 500 units (Number of contracts listed below)

Area/Country

NumberArea/CountryEurope
Germany

164

Southern EuropeItaly

France22

Switzerland

22Holland
Other
Northern Europe
United Kingdom

103

214Asia
Korea

3China

523

Other

10

Other

6North America
United States

1798

Photograph of Facility (Naples, Italy)(Source: Steinmüller Babcock Environment GmbH)Contact:

1518

7

Other

17

Other

SwedenEastern Europe
RussiaNumberNIPPON STEEL ENGINEERING CO., LTD.
Environmental & Energy Solution Sector
Osaki Center Bldg., 1-5-1 Osaki, Shinagawa-ku, Tokyo 141-8604 Japan
Phone：+81-3-6665-2000 Fax.：+81-3-6665-4849
URL: https://www.eng.nipponsteel.com/english/

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