JPH065302A - Heat insulation construction method for fuel cell power generation facility - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a heat insulating construction method for a fuel cell power generation facility, which is capable of downsizing the power generation facility and reducing heat dissipation loss to improve plant efficiency. [Structure] A plurality of devices 10, 20, 30, 40, etc., which need to be kept warm, are installed on the upper surface of a heat-insulated bottom portion 56 at least at intervals necessary for keeping warm, and the plurality of devices are connected by pipes to form a plurality of devices. And the outer frame 50 that encloses the pipes together is attached to the upper surface of the bottom, and then particles of the heat insulating material are filled between the plurality of devices / pipes and the outer frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating construction method for fuel cell power generation equipment.

[0002]

2. Description of the Related Art Molten carbonate fuel cells have characteristics that conventional power generators do not have, such as high efficiency and little impact on the environment, and they are attracting attention as a power generation system following hydropower, thermal power, and nuclear power. Is currently being researched and developed all over the world. In particular, power generation facilities that use molten carbonate fuel cells that use natural gas as fuel are distributed and installed in buildings and condominiums in urban areas. It is in the limelight as a system that can significantly reduce the loss associated with the above and can exhibit a thermal efficiency of 80% or more.

Such power generation equipment is equipped with a reformer and a fuel cell. The reformer reforms natural gas into an anode gas containing hydrogen, and the anode gas and air are used to generate electricity by the fuel cell. It produces hot water.

[0004]

However, in order to fully utilize the characteristics of such power generation equipment, in addition to the reformer and the fuel cell, various equipment such as a desulfurizer, a fuel preheater, and an air preheater are required. Reactor, catalytic combustor, condenser, gas-liquid separator, etc. are required. Therefore, there is a problem that the entire power generation facility becomes large.

In the conventional heat insulating construction method, the heat insulating material and the fibrous heat insulating material are used to enclose the equipment and pipes, etc., which require heat insulation. The board was fixed. However, such a method requires a work space around each device for heat insulating work, and thus has a problem that the entire power generation facility becomes larger.

On the other hand, since the distributed power generation equipment described above is strongly required to be small in size for installation in a building or the like, it is indispensable to arrange each equipment as closely as possible. For this reason, there is a problem in that even a device that reaches a high temperature (for example, 700 ° C. or higher) cannot sufficiently retain heat, heat dissipation increases, and plant efficiency decreases.

The present invention was created to solve such a problem. That is, an object of the present invention is to provide a heat insulating construction method for a fuel cell power generation facility, which is capable of downsizing the power generation facility and reducing heat dissipation loss to improve plant efficiency.

[0008]

According to the present invention, there is provided a method for keeping heat of a fuel cell power generation facility, wherein a plurality of devices which need to be kept warm are installed on the upper surface of the bottom which is kept warm at least at intervals necessary for keeping warm. The equipment is connected by piping, an outer frame surrounding the plurality of equipment and piping together is attached to the upper surface of the bottom portion, and then particles of a heat insulating material are filled between the plurality of equipment and piping and the outer frame. Yes, it consists of things.

According to a preferred embodiment of the present invention, the particles of the heat insulating material are ceramic particles and are a mixture of coarse particles and fine particles. Further, it is preferable that the outer frame is heat-insulated before mounting. Further, the plurality of devices include a reformer for reforming a fuel gas into an anode gas containing hydrogen, a fuel cell for generating power from the anode gas and a cathode gas containing oxygen, and an anode exhaust gas discharged from the fuel cell. It is preferably composed of a catalytic combustor for combusting and a heat exchanger for exchanging heat between the high temperature anode gas leaving the reformer and the low temperature fuel gas supplied to the reformer.
Further, it is preferable that the fuel cell is a molten carbonate fuel cell and the reformer is a plate reformer.

[0010]

According to the present invention, a plurality of devices that need to be kept warm are installed on the upper surface of the bottom that has been kept warm, and after connecting the plurality of devices by piping, a predetermined test, for example, pressure resistance / airtightness test,
Perform an operation test, etc. The plurality of devices are separated from each other by at least an interval required for heat retention. Next, an outer frame that encloses a plurality of devices and piping together is attached to the upper surface of the bottom portion. This outer frame should be heat-insulated before installation. Next, particles of the heat insulating material are filled between the plurality of devices and piping and the outer frame. The particles of the heat insulating material are preferably ceramic particles and a mixture of coarse particles and fine particles.

By this method, unlike the conventional construction method, it is possible to arrange the equipment as close to each other as possible without requiring a work space for heat insulation construction around each equipment, and to make the entire equipment compact. You can Further, since the heat insulating material is filled between the outer frame and each device, it is possible to obtain a thicker and more complete heat insulating performance than ever before, the heat dissipation loss is reduced, and the plant efficiency can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing a power generation facility for carrying out the method according to the present invention. In this figure, a power generation facility includes a reformer 10 for reforming a fuel gas into an anode gas containing hydrogen, a fuel cell 20 for generating power from the anode gas and a cathode gas containing oxygen, and a catalyst for burning the anode exhaust gas. A combustor 30 and a heat exchanger or fuel preheater 40 for exchanging heat between the high temperature anode gas that has exited the reformer 10 and the low temperature fuel gas that is supplied to the reformer 10 are provided. Further, the present power generation facility has a desulfurizer 12 for removing sulfur contained in the fuel gas, an air preheater 14 for preheating air, a condenser 16 for condensing water in exhaust gas, and a condensed water for separation. And a gas-liquid separator 18 that operates.

A fuel gas such as natural gas containing sulfur is desulfurized by a desulfurizer 12 and is then supplied to a fuel heater 40 through a line 1 and heated by the fuel preheater 40 to be supplied to a reformer 10. Supplied.

The reformer 10 reforms the fuel gas by the combustion chamber Co in which the high temperature combustion gas supplied from the catalytic combustor 30 through the combustion gas line 6 is completely burned and the heat transfer from the combustion chamber. The reforming chamber Re. The reformer 10 is preferably a plate-type reformer in which the combustion chamber Co and the reforming chamber Re are made flat and a plurality of these are stacked. The reforming chamber Re is filled with a reforming catalyst, and the high temperature combustion gas generated in the combustion chamber Co reforms the fuel gas into a high temperature anode gas containing hydrogen. The flue gas whose temperature has dropped due to heat radiation is supplied to the air preheater 14 via the flue gas line 7 to heat the air, and then the condenser 16 and the gas-liquid separator 18
Removes water. On the other hand, the high temperature anode gas exiting the reformer 10 is supplied to the fuel preheater 40 via the anode gas line 2, cooled by the fuel preheater 40, and supplied to the fuel cell 20.

The fuel cell 20 has an anode side A through which the anode gas passes and a cathode side C through which the cathode gas passes.
And hydrogen is generated in the anode gas and carbon monoxide, and oxygen and carbon dioxide in the cathode gas generate electricity by a chemical reaction. The fuel cell 20 may be a molten carbonate fuel cell.

The anode exhaust gas and the cathode exhaust gas that have exited the fuel cell 20 are supplied to the catalytic combustor 30 via the anode exhaust gas line 4 and the cathode exhaust gas line 5. The catalytic combustor 30 is filled with a honeycomb-shaped combustion catalyst containing nickel as a main component, and the unburned components contained in the anode exhaust gas are burned by the oxygen contained in the cathode exhaust gas. The high temperature combustion gas generated in the catalytic combustor 30 is supplied to the combustion chamber Co of the reformer 10 via the line 6.

In some cases, the anode exhaust gas is directly combusted in the combustion chamber of the reformer 10 without using the catalytic combustor 30.

In the cathode gas line 3 of the fuel cell 20, an air source (not shown), an air line 8 and an air preheater 14 are provided.
Air is supplied through the. A part of the combustion exhaust gas from which water has been removed by the condenser 16 and the gas-liquid separator 18 is supplied to the air line 8 so that carbon dioxide necessary for the reaction of the battery is supplied.

Further, a part of the cathode exhaust gas passing through the cathode side C of the fuel cell is circulated to the cathode line 3 via the cathode circulation line 9. A heat exchanger (not shown) and a blower 22 are usually provided in the cathode circulation line 9 so that the temperature and flow rate of the circulating cathode gas can be controlled.

In the above-mentioned power generation equipment, the reformer 10, the fuel cell 20, the catalytic combustor 30, the fuel preheater 40, and the pipes between them are particularly high in temperature, and a sufficient heat insulating work is required. Therefore, it is preferable to store these devices in a common outer frame. That is, for example, in FIG. 1, all the equipment and piping surrounded by the one-dot chain line are stored in one outer frame 50.

Other devices, for example, the desulfurizer 12, the air preheater 14, the condenser 16 and the gas-liquid separator 18 in FIG. 1 do not have to be stored in the outer frame 50 because their operating temperatures are relatively low. good.

FIG. 2 is a schematic cross-sectional view showing a state in which the equipment and piping surrounded by the one-dot chain line in FIG. 1 are stored in a common outer frame 50. As shown in this figure, the outer frame 50 is provided with an inlet 52 for filling the particles of the heat insulating material inside and an outlet 54 for taking out the particles of the heat insulating material. It is preferable that the inlet 52 is provided at the upper portion of the outer frame 50 and the outlet 54 is provided at the lower portion. The particles may be filled by pneumatic transportation or the like, or may be simply charged inside by a conveyor or the like. The packed particles are made to have an appropriate density by an appropriate method such as vibration or sticking. Further, as shown in the drawing, the actuator frame of the control valve, the electric motor, and the like are formed with an outer frame so as to extend outside the outer frame for control and heat dissipation.

The heat insulating construction of the power generation equipment is carried out in the following procedure. First, a plurality of devices 10, 20, 30, 40, etc. that require heat insulation are installed on the upper surface of the bottom portion 56 that has been heat-insulated at least at intervals necessary for heat insulation. This space may be set to the minimum size required when the outer frame is completely filled with the heat insulating material, and does not require a space for maintenance or work.

Next, the plurality of devices 10, 20, 3
0, 40, etc. are connected by piping. It is advisable to perform the operation test and pressure resistance test of each device at this stage. Then, the outer frame 50 that encloses the plurality of devices and piping together is attached to the bottom portion 56.
To the top of the. Before mounting the outer frame 50, it is preferable that the inner surface thereof is sufficiently heat-insulated with a heat-insulating material having high heat-insulating performance, for example, silica wool or cahor.

Next, particles of a heat insulating material are filled between the plurality of devices and piping and the outer frame. The particles of this heat insulating material are heat insulating materials that can withstand a high temperature of 700 to 800 ° C., for example, particles of ceramics, silica, calcium silicate, perlite, and the like, and are a mixture of coarse particles and fine particles. good. Thereby, the packing rate of particles can be adjusted and the required heat retention performance can be obtained.

[0026]

EFFECTS OF THE INVENTION According to the heat insulation construction method of the present invention, unlike the conventional construction method, a work space for heat insulation construction around each device is not required, and the equipment can be arranged as close to each other as possible. The whole can be made small. In addition, since a heat insulating material is filled between the outer frame and each device, it is possible to obtain a thicker and more complete heat insulating performance than before,
Radiation loss is reduced, and plant efficiency can be improved.

Therefore, according to the present invention, it is possible to reduce the size of the power generation equipment, reduce the radiation loss, and enhance the plant efficiency.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a power generator according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a state in which a device and a pipe surrounded by a chain line in FIG. 1 are stored in a common outer frame.

[Explanation of symbols]

 1 fuel gas line 2 anode gas line 3 cathode gas line 4 anode exhaust gas line 5 cathode exhaust gas line 6 combustion gas line 7 combustion exhaust gas line 8 cathode gas line 9 cathode circulation line 10 reformer 12 air preheater 16 condenser 18 Gas-Liquid Separator 20 Fuel Cell 30 Catalytic Combustor 40 Fuel Preheater 50 Outer Frame 56 Bottom of Outer Frame

Claims (5)

[Claims] 1. A plurality of devices that need to be kept warm are installed on the upper surface of the bottom portion that has been subjected to heat insulation at least at intervals necessary for keeping the heat, the plurality of devices are connected by pipes, and the plurality of devices and the pipes are collected together. A heat insulating construction method for a fuel cell power generation facility, comprising mounting an enclosing outer frame on an upper surface of the bottom portion, and then filling particles of a heat insulating material between the plurality of devices and pipes and the outer frame. 2. The method according to claim 1, wherein the particles of the heat insulating material are ceramic particles and are a mixture of coarse particles and fine particles. 3. The method according to claim 1, wherein the outer frame is heat-insulated before mounting. 4. The plurality of devices comprises a reformer for reforming a fuel gas into an anode gas containing hydrogen, and a fuel cell for generating power from the anode gas and a cathode gas containing oxygen.
It consists of a catalytic combustor that burns the anode exhaust gas that exits the fuel cell, and a heat exchanger that exchanges heat between the high-temperature anode gas that exits the reformer and the low-temperature fuel gas that supplies the reformer. The method according to claim 1, wherein 5. The method according to claim 4, wherein the fuel cell is a molten carbonate fuel cell, and the reformer is a plate reformer.