Source:JASE-W Japanese Smart Energy Products & Technologies

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

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Keywords

Y3

equipment or facility

Z3

natural gas

S4

FEMS

DConstruction

NIPPON STEEL ENGINEERING CO., LTD.

Dry-process Dust Collector for Blast Furnaces
Features
A dry-process dust collector for blast furnace is equipment for cleansing blast furnace gas. The energy inblast furnace gas (in the forms of pressure and temperature) is recovered by a TRT generator after passing through the dust collector.
The energy in the furnace gas has been lost in the conventional wet-process dust collector as thetemperature and pressure of the gas decreases significantly when the gas passes through the dust
collector.
The dry-process dust collectors available from Nippon Steel Engineering in two types, the bag-filter
collectors and electrostatic precipitators, have the following advantages.
◆ The temperature of furnace gas decreases little in the collectors.
◆ The pressure of furnace gas decreases little in the collectors.
The dry electrostatic precipitators have additional advantages mentioned below.
◆ They can collect dust from furnace gas at high temperature because the upper limit of the temperature
for their operation is high.
◆ The maintenance cost is low (because they do not require replacement parts, such as bag filters inbag-filter collectors).
Basic Concept or Summary◆ Dry electrostatic dust collection method
The dry-process bag filtering system, created by technologies that nurtured the wet-processelectrostatic precipitators (ESCS) and the multi-tower dry-process bag filter, is the latest system tooffer a superb low pressure loss of performance and does not require the supplementary installation ofa wet-process dust collector.

Dry electrostatic
precipitators

As the dust collection part is made of metal, electrostatic precipitators aretolerant to furnace top gas at high temperature (up to 350 ºC). Therefore,
they can collect dust from furnace gas of varying temperature.

BF:Blast Furnace
DC:Dust Catcher
VS:Venturi Scrubber

PCVS:Blast furnace top gas pressure controlled venture scrubber
TRT:Top pressure Recovery Turbine
SV:Septum ValveEffects or Remarks
1. The amount of electricity recovered with TRT increased (by 20 to 35% in comparison with wet-process
dust collectors).
2. Water spraying for dust removal, required with wet-process dust collectors, is not necessary withdry-process dust collectors.
3. Since blast furnace gas is used to expel captured dust with the transportation of air flow, discharging
units have been simplified and facility costs have been lowered.
4. With dry electrostatic precipitators there is no danger of damage to facilities, such as filter fabric, evenwhen abnormal operations are performed, such as a gas blow out inside the blast furnace, furthermore, there is no need to install a supplementary wet-process dust collector.

Installation in Practice or ScheduleDouble venturi scrubber and dry-process bag filtering system
Domestic

Nippon Steel Corporation Kyushu Works (2 units) and Nagoya Works

Overseas

Taiyuan Iron and Steel Group

Contact:

NIPPON STEEL ENGINEERING CO., LTD.,
Plant & Machinery Sector
Osaki Center Building, 1-5-1 Osaki, Shinagawa-Ku, Tokyo 141-8604 Japan
Tel: +81-3-6665-2000 Fax: +81-3-6665-4847

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