Renovation Project of Desulfurization and Synergestic Flue Gas Dust Removal for 660 MW Coal-Fired Power Plant of Huaneng Zuoquan Power Station in Shanxi Province, China

1. Profile

(1) Project site:

Zuoquan County, Jinzhong City, Shanxi Province.

(2) Owner:

Huaneng Zuoquan Coal & Power Co., Ltd.

(3) Capacity:

Desulfurization and dust removal of 660MW coal-fired power plant.

(4) Date of operation:

December 2015.

(5) Investment, construction and operation:

It was invested, built and operated by HUANENG Power Int'l Inc., and Wuhan Kaidi Electric Power Environmental Co., Ltd. was the EPC contractor of ultra-low emission renovation of the desulfurization tower.

2. Major environmental problems to be addressed

Ultra-low emissions of SO₂ and particulate matter from the high-sulfur coal (with 1.5-2.4% sulfur content) were achieved.

3. Environmental standards and/or main index limits to be followed

According to the ultra-low emission limit of the coal-fired power plant, the particulate matter emission concentration shall be≤5 mg/m³, and SO₂ emission concentration shall be≤35 mg/m³.

4. Technological process

The absorption tower reconstruction plan uses 1 tray layer + 4 spray layers + 1 film liquid holdup layer. The flue gas enters from the middle and lower parts of the absorption tower, passes through the tray layer and four spray layers, then enters the film liquid holdup layer. And the flue gas at the outlet of the film liquid holdup layer enters the horizontally-arranged flue demister for demisting and then flows to the chimney.

5. Environmental pollution control effects

When SO₂ concentration reached 6,000 mg/m³ and particulate matter concentration was

30 mg/m³ at the inlet of the desulfurization device, SO₂ concentration was≤20 mg/m³ and particulate matter concentration was ≤3 mg/m³ at the outlet.

6. Investment and operation cost

The investment in project renovation was about RMB 53.3 million, and the operation cost was about RMB 0.002/kWh.

Case highlights: The staged composite absorption tower taking “tray + spray layer + film liquid holdup layer" as the core for deep desulfurization and efficient synergestic dust removal has realized ultra-low emissions of SO₂ and particulate matter in flue gas from the power plant burning high-sulfur coal (with 1.5-2.4% sulfur content).