Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)
2Application of Leading-Edge High-Efficiency USC
Lignite-Fired Power Plant in Turow, Poland

MASATAKA YOROZU*1

DAYAN RAJAPAKSE*2

YOSHINORI TAGUCHI*3

MASASHI MITSUKAWA*4JӦRG BӦWE*5

The Turow Power Plant (447.5MW (Net), 262bar(a)/597°C/609°C) in Poland is currently
under construction, with the start of commercial operation scheduled for April 2020. The plant istargeting the world's highest level of efficiency for a lignite-fired power plant. Mitsubishi Hitachi
Power Systems, Ltd. (MHPS) provides high-efficiency lignite-fired plant by applying its own
lignite-fired tower boiler technology, lignite mill burner technology, ultra-supercritical (USC)
technology and boiler flue gas heat recovery system. This report introduces the high-efficiency
USC lignite firing technology applied to the Turow Power Plant.

|1. Introduction
In Poland, lignite is produced in abundance, and many lignite-fired thermal power plants
have been constructed. In 2014, MHPS received the order for the construction of the Turow PowerPlant from Polska Grupa Energetyczna S.A. (PGE), which is the largest Polish energy company,
and construction has been proceeding toward the commencement of commercial operation in April
2020. MHPS's own lignite-fired tower boiler technology, lignite mill and burner technology, USCtechnology, air quality control system (AQCS) and boiler flue gas heat recovery system are appliedin this plant. As a lignite-fired power plant, this plant is targeting the world's highest level ofefficiency. The high-efficiency USC lignite-fired technology applied to the Turow Power Plant isintroduced below.

|2. Project overview
In the Turow new unit construction project, Polska Grupa Energetyczna S.A. (PGE) isconstructing a supercritical lignite-fired thermal power plant at its site near the Turow coal mines.
Three-company consortium consisting of the MHPS Group (MHPS and consortium leader,
Mitsubishi Hitachi Power Systems Europe GmbH (MHPS-EDE)), Tecnicas Reunidas (Spain) andBudimex SA (Poland) was selected as the Engineering, Procurement and Construction (EPC)
contractor and received the order in July 2014. Construction of the new unit was started on
December 1, 2014. Plant construction period is 65 months and the commencement of commercialoperation is scheduled for the end of April 2020.
MHPS-EDE within the EPC contractor consortium will deliver a lignite-fired tower boiler
and boiler auxiliaries and environmental facilities (including the NOx removal equipment and theelectrostatic precipitator). MHPS will deliver turbine/generator set and turbine plant auxiliaries inaddition to supplying the flue gas desulfurization (FGD) equipment. Tecnicas Reunidas andBudimex SA will be in charge of the supply of plant electrical equipment facilities and the cooling
tower, as well as the civil engineering, civil works and equipment installation work.
Figure 1 shows the exterior view of the plant, and Table 1 presents the major specificationsof the Turow Power Plant.
*1 Chief Staff Manager, Power Systems Project Engineering Department, Power Systems Project Management Division, Mitsubishi Hitachi Power Systems, Ltd.
*2 Chief Staff Manager, Power Systems Project Engineering Department, Power Systems Project Management Division, Mitsubishi Hitachi Power Systems, Ltd.
*3 Chief Staff Manager, Air Quality Control Systems Project Management Department, Air Quality Control Systems Technology Division,Mitsubishi Hitachi Power Systems, Ltd.
*4 Plant Engineering Department, Plant Engineering Division, Mitsubishi Hitachi Power Systems, Ltd.
*5 Mitsubishi Hitachi Power Systems Europe GmbH CTO Dipl.-Ing.（Germany）

Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)3

Table 1 Major specifications ofTurow Power Plant

Figure 1

Exterior view of the plant (image)

Item
Specifications
Plant output
447.5 MW (Net)
Plant efficiency >43% (Net)
BoilerTower type (120m) lignite-fired
Steam conditions: 271bar (a)/600/610°C
Steam flow rate: 1275 t/h (SH),
1061t/h (RH)
TurbineDouble flow 48-inch (TC2F-48)
Steam conditions: 262bar (a)/597/609°CGenerator
603MVA, 21kV
Cooling system Natural draft cooling tower
Noise
55dB(A) or less (45dB(A) at night)(site boundary)|3. Lignite-fired tower boiler
Lignite coal is used as main fuel. In general, high-temperature heat source is required fordrying lignite coal because it has high moisture content. It also has high volatile matter and good
combustibility, and as such it ignites easily. Since lignite has these characteristics, the combustion
system that differs from that of bituminous coal and subbituminous coal was adopted in this plant.
Figure 2 presents an overview of the combustion system configuration of the boiler, andTable 2 shows the major specifications of the boiler.

Table 2 Leading specifications of the boiler
ItemBoiler type

Steam conditions
Main steam flow rate
Superheater outlet pressure
Superheater outlet temperature
Reheater outlet temperature
Burner typeMill type
Draft system
Steam temperature control
SH outlet
RH outlet

Specifications
Tower boiler(once-through,supercritical variable
pressure, single reheat)
1275 t/h
271 bar (a)
600°C
610°C
RS® burner
DGS® millBalanced draft
Water/fuel ratio control,
Spray attemperator
Spray attemperator

Figure 2 Overview of the combustion system
configuration of the lignite-fired boiler(1) Coal drying method
Because high-temperature drying heat source is required, part of the flue gas is circulated
from the furnace outlet as a coal drying heat source. On the other hand, lignite has a highvolatility and ignites easily. Therefore, the required drying temperature and maximum oxygen
concentration are adjusted by mixing the hot flue gas discharged from the furnace with the cold
flue gas downstream of the electrostatic precipitator (ESP) and hot air.
(2) Fan-mill
The fan-mill is an apparatus that has the functions of a primary fan and mill for
conveyance and crushing. MHPS has two types: NV (Nasskohlen Ventilator) mill and DGS(Distributor Gebläse Schläger) mill. The NV mill crushes coal just by using the beater wheel,
while the DGS® mill crushes coal using the beater heads in addition to the beater wheel. Thetype of mill to be used is selected by the properties of the coal to be used. The lignite coal usedin the Turow Power Plant is relatively difficult to be crushed among lignite, and so the DGS®
mill was adopted.

Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)4(3) Burner
The RS® (Rund Strahl) burner that was developed as a burner for lignite to achieve
controlled ignition and combustion which lead to low NOx emissions. The burners are installed
all around the furnace wall. Three burners are linearly disposed in the vertical direction of thefurnace wall from one mill.
(4) Burnout grate
At the bottom of the furnace, burnout grates are installed so that unburned carbon in ash
is combusted to improve the boiler efficiency.

|4. Flue gas heat recovery system
4.1 Overview
Lignite is characterized as a low heating value fuel with high water content. Due to thesecharacteristics, the combustion air and the flue gas flow rate of the lignite-fired boiler is larger thanthat of the same class bituminous coal-fired boiler, and the size of the boiler is also larger. In
general coal fired boiler, the heat of the flue gas is recovered in combustion air and utilized for
improvement of the plant efficiency. However, in the lignite-fired boiler, the heat of the flue gas islarger than the required heat for the combustion air, and therefore, the surplus flue gas heat will bereleased through flue gas into atmosphere. In the Turow Power Plant, boiler flue gas heat recovery
system is installed to exchange the surplus flue gas heat with the turbine plant feed water /condensate water, to improve the plant efficiency.
An overview of the system configuration and the operation method are described below.

4.2 System configuration
Figure 3 shows an overview of the system configuration of the boiler flue gas heat recoverysystem adopted in the Turow Power Plant. The boiler flue gas heat recovery system consists of two
flue gas water heaters.
i. Flue-Gas-High-Pressure-Water-Heater system (FGHPWH system): High-pressure flue gas
water heater exchanges the heat from flue gas to feed water.
ii. Flue-Gas-Low-Pressure-Water-Heater system (FGLPWH system): Low-pressure flue gas
water heater exchanges the heat from flue gas to condensate water.

Figure 3

Overview of the system - Boiler flue gas heat recovery system(1) High-pressure heat recovery system (water side)
The water side of the FGHPWH is arranged in bypass line of the high-pressure feedwater
heaters and the dry heater. At the upstream of the high-pressure feedwater heaters, a three waycontrol valve is installed and distributes the feedwater flow to the high-pressure feedwater
heaters and FGHPWH. The feedwater in the FGHPWH is heated up and the preheated water isMitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)5

led back to the main feedwater system via a three way control valve.
(2) Low-pressure heat recovery system (water side)
The water of the FGLPWH is taken from the downstream of the low-pressure condensate
heaters and the preheated condensate from FGLPWH outlet is led back to the feedwater tank. Abooster pump is installed to prevent flash of the condensate water at the FGLPWH outlet. Inaddition, a circulating pump is installed, which returns part of the hot condensate at theFGLPWH outlet to the inlet, to prevent the precipitation of SO2 caused by the lowering boiler
flue gas temperature.

4.3 Operation(1) High-pressure heat recovery system
The feed water flow through the FGHPWH is load dependent. The required flow isadjusted by the three way control valve at the upstream of the high-pressure feedwater
preheaters.
(2) Low-pressure heat recovery system
The inlet water temperature of the FGLPWH is controlled by the feed flow through theFGLPWH. The flow is adjusted by the control valve and the temperature set point depends on
the SO2 content.

|5. Conclusion
This report introduced the high-efficiency USC lignite-fired technology applied to the Turow
Power Plant. In Poland and other countries in Eastern Europe, lignite is produced in abundance,and high expectations have been placed on lignite-fired thermal power plants. At the same time,
however, due to the rise in environmental awareness in recent years, further development ofhigh-efficiency technology and environmental protection technology is required. MHPS has beenworking on developing high-efficiency USC technologies for many years. We will continue tomake efforts to develop such technologies and contribute to the utilization of energy resources andthe preservation of the global environment.