Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)35

MHPS Middle & Small Capacity Gas Turbines andWeb-based Performance Calculation Tool

M i ts u b i s h i H i ta c h i P o w e r S y s t e m s , L t d .

The lineup of the H-Series middle & small capacity gas turbines of Mitsubishi Hitachi Power
Systems, Ltd. (hereinafter, MHPS) is comprised of the 40MW-class H-25 series and the 100 MW
to 120MW-class H-100 series, which have been widely used for private power generation forindustrial use and the power generation business. Due to its dual-shaft configuration, theapplication of the H-100 series gas turbine to LNG plants for driving compressors is also underconsideration. In this article, the H-25 and H-100 series gas turbines and the web-based ProductSelection Assistant Program, which was developed for customers who are considering theapplication of middle & small capacity gas turbines are introduced.

|1. H-25 series gas turbine
The H-25 series gas turbine is a single-shaft gas turbine with a heavy-duty design. Figure 1shows a cross-sectional view of the H-25 series gas turbine and a photo of the opened upper-halfcasing. Since the first unit started operation in 1988, orders for a total of 176 units have been
received from both inside and outside of Japan. The customers and plant configurations using theH-25 series gas turbine are shown in Figure 2. About half of the customers use the H-25 series gas
turbine on site in the oil & gas industries. The H-25 series gas turbines are applied to various plantconfigurations such as simple cycle, cogeneration and combined cycle. The delivery regions of theH-25 series gas turbine are shown in Figure 3. Many units are in service, and the cumulative total
operating hours have exceeded 6.3 million hours, which proves their high reliability. The featuresof the H-25 series gas turbine are as follows.
(1) It has a heavy-duty design, reliable, and suitable for continuous operation.
(2) The adoption of a horizontally-split casing and a multiple-can type combustor offers good
maintenance performance and easy on-site replacement of hot components.
(3) The fuel diversification technology enables the use of fuels such as natural gas, light oil, LPG(Liquefied Petroleum Gas), off gas, COG (Coke Oven Gas) and bioethanol.
For the H-25 series gas turbine, since the start of operation of the first unit, improvements
such as increased combustion temperature and improved aerodynamic and cooling performances
have been continuously implemented. At the beginning of the development, the output was 25MW
class, whereas it is now 40MW class. The specifications of the H-25 series gas turbine are indicatedin Table 1.

Figure 1

H-25 series gas turbine

Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)36

Figure 2 Customer industries and applications (plant configurations) for H-25 series gas turbines

Figure 3

H-25 series gas turbine delivery countries
Table 1 Basic specifications of H-Series gas turbines

Item

H-25
50Hz / 60Hz
Heavy-duty design,
single-shaft

Type
Compressor
Combustor
TurbineOutputEfficiency
Rated speed
1 on 1
combined cycle
performance
2 on 1
combined cycle
performance

OutputH-100
50Hz60Hz

Heavy-duty design, dual-shaft

Axial-flow type, 17 stages
Multiple-can type, 10 cans
Axial-flow type, 4 stages
Axial-flow type, 3 stages(High pressure: 2 stages + Low pressure: 2 stages)
41030 kW118200 kW
105780 kW
36.2% LHV
38.3% LHV
38.2% LHV
7280 rpm
4580 / 3000 rpm
4580 / 3600 rpm
60100 kW
172600 kW
150000 kW

Efficiency

54.0% LHV

57.2％ LHV

55.1% LHV

Output121400 kW

347800 kW

305700 kW

Efficiency

54.5% LHV

57.6％

56.1% LHV

|2. H-100 series gas turbine
The H-100 series gas turbine is a dual-shaft gas turbine with a heavy-duty design. Figure 4shows a cross-sectional view of the H-100 series gas turbine and a photo of the opened upper-halfcasing. In 2010, the first H-100 series gas turbine for 60Hz areas started operation, and in 2016, thefirst H-100 series gas turbine for 50Hz areas entered service. Orders for a total of 21 units havebeen received so far, and the cumulative operating hours have exceeded 360,000 hours. In addition
to a heavy-duty design like the H-25 series gas turbine, the H-100 series gas turbine has thefollowing features:(1) All 21 orders were for combined cycle plants, and the H-100 unit achieves the highest-level ofefficiency in the same output class.
(2) By replacing an old gas turbine of the same output class with the H-100 series gas turbine, theefficiency can be increased. (Orders for 20 units were received under the GT replacement
project.)(3) Due to its dual-shaft configuration with separate high-pressure and low-pressure turbines, theH-100 series gas turbine is suitable for driving machinery. The low-pressure turbine has a wide
range of speeds (70% to 105%), and the required starting torque is smaller compared with asingle-shaft configuration, allowing a smaller-capacity starting device to be used.
(4) Quick starts are possible with a starting time of 10 minutes.

Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)37

The specifications of the H-100 series gas turbine are shown in Table 1. We plan tocontinuously increase the performance of the H-100 series gas turbine for 300MW-class combined
cycle power plants as mid-level capacity and to introduce to the market a dual-fuel combustor, suchas one using natural gas and light oil, as well as a natural gas-fired dry type low NOx combustor.

Figure 4

H-100 series gas turbine|3. Web-based Product Selection Assistant Program
MHPS developed and released the web-based Product Selection Assistant Program tosupport customers considering the introduction of private power generation and entering the power
generation business, for the selection of middle & small capacity gas turbines, as well as for theconsideration of required site area, delivery period, economic efficiency, etc., in the initial study
stage. The Product Selection Assistant Program features A) Easy Product Selection and B) Detailed
Production Selection.
(http://www.mhps.com/products/gasturbines/diagnosis/index.html)
A) Easy Product Selection Program
To determine which model of H-Series product would best meet the needs of a customer,
the customer answers questions using the web-based tool. With such easy operation, theoptimal model is selected and the standard performance, standard plant layout, standard
delivery period and typical revenue from sales of electric power are proposed. The customer
operates the buttons or bar chart to enter the frequency (50Hz or 60Hz), plant configuration(simple cycle, combined cycle or cogeneration) and demand (required power or required steamoutput) or fuel flow availability. The operation and execution of the Easy Product Selection
Program requires no customer registration. Figure 5 shows an example of Easy ProductSelection results.

Figure 5

Screen of Easy Product Selection Program (Example)

Mitsubishi Heavy Industries Technical Review Vol. 54 No. 3 (September 2017)38B) Detailed Production Selection Program
When the customer enters the environmental conditions (atmospheric temperature,relative humidity and altitude), unit fuel price, unit price of sales of electric power, annual
operating time, investment, interest, etc., in addition to the entry (selection) in the Easy ProductSelection Program, the plant performance and profitability under the environmental conditions
are calculated. Figure 6 illustrates an example of the Detailed Production Selection results. The
Detailed Production Selection program is intended for customers who are considering a specificplan for a power generation plant and it requires prior registration for the operation andexecution of the program so that subsequent support can be provided.

Figure 6

Screen of Detailed Production Selection Program (Example)|4. Future development
We have received more than 200 orders for H-Series gas turbine units so far, and theperformance and reliability of H-Series gas turbines are highly evaluated by our customers. We areexpected to meet customer demands through further improvements of performance and reliability.
On the other hand, for a customer's initial consideration of the application of an H-Series gasturbine, we provide the web-based Product Selection Assistant Program for continuous customer
support.