Conclusions

The developed 200 kW multi-fuel type PAFC power plant can be started up and can generate constant power at AC 200 kW by pipeline town gas and LPG. In this plant, constant power generation at AC 200 kW can be continued by switching fuel from pipeline town gas to LPG and vice versa, and 8.4 kW of the parasite-power consumption for the LPG vaporizer can be decreased by using exhaust heat from the plant when power is generated at AC 200 kW by LPG.

OPERATION RESULT OF 40kW CLASS MCFC PILOT PLANT

H.Saitoh, S. Hatori, M. Hosaka, H. Uematsu I sh ikarra j ima-Har iraa Heavy Industries Co., Ltd.

3-1-15, Toyosu Koto-ku, Tokyo 135 JAPAN

Introduction

Ishikawajima-Harima Heavy Industries Co., Ltd. developed unique Molten Carbonate Fuel Cell (MCFC) system based on our original concept. To demonstrate the possibiIity of this system, based on MCFC technology of consigned research from New Energy and Industrial Technology Development Organization (NEDO) in Japan, we designed 40kW class MCFC pilot plant which had all equipments required as a power plant and constructed in our TO-2 Technical Center. This paper presents the test results of the plant.

1. Test objectives

The main objectives of this test plant are to verify the following items in our concept.

1) Start-up and Shut-down operation within allowable differential pressure limits of stack.

2) Cathode / anode differential pressure control method without high—temperature valves.

3) Emergency shut-down operation within allowable limits of stack.

4) High fuel utilization and high power generation efficiency.

2. Plant Description

The view and process flow diagram of this test plant are shown in Figure 1 and 2 respectively.

In our system, both cathode and anode exhaust gas fed to a reformer combustor, and sensible heat of cathode gas is used as a part of reforming heat source.

Such cathode gas sensible heat reforming method and series arrangement of stacks for gas flow direction real ize high fuel uti I ization, and then, high power generation efficiency.

3. Test Results

The main results in Process and Control (PAC) test are summarized below.

1) The start-up and shut-down operation were verified.

2) As shown in Figure 3, the results of load change test showed us that load change of 10K/min will be available without high-temperature differential pressure control valves.

3) Figure 4 shows typical data of differential pressure in emergency shut-down test at rating load.

The differential pressure were controlled successfully within allowable pressure limits of stack. After PAC test we have been performing total plant demonstration test. We have conf i rmed the appl icabi I ity of cathode gas sensible heat reforming method and series arrangement of stacks for gas flow direction.

4. Conclusions

We have been operating 40kW class MCFC pilot plant successfully first in the world as external reforming system. Through design and demonstration test of this plant, the results clearly show that cathode gas sensible heat reforming methodandseriesarrangementof stacks for gas f low di recti on is an effective way for high fuel utilization and high power generation efficiency, also cathode / anode differential pressure control method without high-temperature control valves is realized by connecting the outlet of both cathode and anode of stack with the inlet of combustion side of reformer di-

reot|y- FIG. 1 : VIEW OF 40KW CLASS PILOT PLANT

We believe that these test results will accelerate further realization of MCFC power plant.

5. Acknowledgment

This work has been conducted under MCFC technology of consigned research from NEDOCNew Energy and Industrial Technology Development Organization) and MCFC Research Association(Technology Research Association for Molten Carbonate Fuel Cel I Power Generation System) as a part of the New Sunshine Program of MITKHinistry of International Trade and Industry). We appreciate their advice and support.

Fuel preheater

Co : Combustion ehaaber Re : Reforming chaaber

Fuel preheater

Co : Combustion ehaaber Re : Reforming chaaber

Exhaust gas

Superheater Steaa generator '—J^--Water

Feed Hater piup

Fia 2 : PROCESS FLOW DIAGRAM

FIG. 3 : RESULT OF 10X/niin LOAD CHANGE TEST

Vessel

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