JP2009076392A - Liquid fuel cell power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control accurately a desulfurized liquid fuel flow-rate that is supplied to a reformer. <P>SOLUTION: The liquid fuel cell power generation system is provided with a primary liquid fuel tank 31 to store a liquid fuel, a liquid supply pressure pump 32 to send the liquid fuel from this primary liquid fuel tank 31, a desulfurizer 34 to reduce a sulfur compound contained in the liquid fuel sent from the liquid supply pressure pump 32, a secondary liquid fuel tank 38 to store the liquid fuel treated by the desulfurizer 34, and a fuel treatment device 39 to generate a gas containing much of hydrogen from the liquid fuel treated by the desulfurizer. A gas-liquid separator 36 is provided on the downstream side of the desulfurizer 34 and the secondary liquid fuel tank 38 is made open to the atmosphere. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid fuel cell power generation system using a liquid fuel containing sulfur such as kerosene.

The fuel cell power generation system takes out electricity directly by electrochemically reacting hydrogen as fuel and oxygen as oxidant. The system can take out electrical energy with high efficiency, and at the same time has a feature that is quiet and has excellent environmental characteristics such that there are very few harmful components in the exhaust gas. Recently, development of small PEFC (solid polymer fuel cell) has been activated, and the popularization of household fuel cell power generation systems has become imminent.
This relatively small fuel cell power generation system for home use or small-scale business is used as a combined heat and power supply so-called cogeneration device that supplies electric power and exhaust heat accompanying power generation.

  In operating such a fuel cell power generation system, particularly a fuel cell power generation system aimed at cogeneration power generation at home, application of liquid fuel suitable for transportation and storage is being studied. For example, kerosene has been proposed.

  However, liquid fuels such as kerosene often contain sulfur compounds. And these sulfur compounds have the characteristic which poisons many of the catalysts used with a fuel processing apparatus, and inhibits hydrogen production. Therefore, it is necessary to treat the liquid fuel with a desulfurizer before introducing it into the fuel processor to reduce the sulfur compounds contained.

  By the way, in order to ensure the performance of the desulfurizer, it is necessary to maintain high temperature and high pressure. However, since a combustible gas that is a by-product of the desulfurization reaction is generated, it is necessary to appropriately treat the generated gas. Patent Documents 1 and 2 are known as systems for desulfurizing such a liquid fuel.

  The fuel cell system of Patent Document 1 is configured as shown in FIG. A desulfurization apparatus 1 of the system includes a desulfurizer 2 that desulfurizes liquid hydrocarbons, a storage tank 3 that is connected downstream of the desulfurizer 2 and stores liquid hydrocarbons after desulfurization, and a pump 4 connected to the storage tank 3. And. In the figure, reference numeral 5 indicates a pressure sensor, reference numerals 6a, 6b and 6c indicate valves, and reference numeral 7 indicates a flow meter. Reference numerals LH and LL in the figure denote an upper limit level sensor and a lower limit level sensor for controlling the amount of desulfurized kerosene stored within a certain range, respectively. Hydrogen recovery means is constituted by the valve 6 a and the space of the storage tank 3. A storage tank 9 is connected to the desulfurizer 2 via a liquid feeding means 8. The system further includes a burner 10, a reformer 11, and a fuel cell stack 12. In the figure, reference numeral 13 indicates a kerosene supply flow path, and reference numeral 14 indicates a reformed gas flow path.

The hydrogen production apparatus of Patent Document 2 is configured as shown in FIG. The hydrogen production apparatus 15 includes a raw material tank 16, a desulfurizer 18 connected to the raw material tank 16 via a pump 17, and a raw material vaporizer 21 connected to the desulfurizer 18 via a pressure regulating valve 19 and a switching valve 20. A reformer 22 connected to the raw material vaporizer 21, an evaporator 23 connected to the raw material vaporizer 21, and a water tank 25 connected to the evaporator 23 via a pump 24. Reference numeral 26 in the drawing indicates a bypass line connecting the raw material tank 16 and the switching valve 20.
JP 2007-70502 A JP 2007-51864 A

Patent Document 1 discloses a desulfurization liquid fuel tank (storage tank 3) installed downstream of the desulfurizer 2 in order to store liquid fuel (hereinafter referred to as desulfurization liquid fuel) in which organic sulfur compounds are reduced in the desulfurizer 2. The present invention relates to a system for discharging combustible gas to a burner of a reformer. In the system, in order to prevent the combustible gas and air from being mixed in the storage tank 3, a shut-off valve, a check valve or the like is required in the discharge line.
Also, by the change in the liquid level of the desulfurized liquid fuel stored in the storage tank 3 with the shut-off valve closed, or by the change in the burner pressure of the reformer 11 with the shut-off valve open, There is a problem that the internal pressure of the storage tank 3 changes.

Further, when desulfurized liquid fuel is supplied from the storage tank 3 to the reformer 11 installed downstream of the storage tank 3 using a pump as a driving force, the pump inlet pressure changes. There is a possibility that the correlation between the flow rates of the desulfurized liquid fuel supplied is shifted. Therefore, when the flow meter 7 is installed downstream of the pump 4 and the desulfurized liquid fuel flow rate supplied to the reformer 11 is measured, a deviation from the liquid fuel flow rate assumed from the pump rotation speed occurs. It is necessary to correct the pump speed.
Furthermore, for example, in a 1 kW class fuel cell power generation system, the flow rate of the desulfurized liquid fuel is about 3.5 cc / min, and it is necessary to measure a small flow rate with high accuracy, so an expensive flow meter is required. Therefore, in order to accurately control the fuel flow rate of the desulfurization liquid without installing a flow meter, it is desirable that the storage tank 3 be opened to the atmosphere and maintained at atmospheric pressure.

  Patent Document 2 is configured to return the desulfurized liquid fuel to the raw material tank 16 installed upstream of the desulfurizer 18 when the desulfurizer 18 at the time of starting and stopping the fuel cell power generation system is below a predetermined temperature. This is a system that prevents desulfurized liquid fuel from flowing into the reformer 22. In this system, since the combustible gas may also be mixed into the raw material tank 16, there is a problem in safety due to the mixed state of liquid fuel, combustible gas and air.

  Therefore, in the case of the configuration in which the desulfurized liquid fuel treated in the desulfurizer 18 is returned to the raw material tank 16, in order to appropriately treat the combustible gas that is a byproduct of the desulfurization reaction, upstream of the raw material tank 16. It is desirable for safety to handle.

  The present invention has been made in view of such circumstances, and by installing a gas-liquid separator downstream of the desulfurizer to safely treat the combustible gas and open the secondary liquid fuel tank to the atmosphere. An object of the present invention is to provide a liquid fuel cell power generation system capable of accurately controlling the flow rate of desulfurized liquid fuel supplied to the reformer.

  A liquid fuel cell power generation system according to the present invention includes a primary liquid fuel tank that stores liquid fuel, a liquid booster pump that sends liquid fuel from the primary liquid fuel tank, and a liquid fuel that is sent from the liquid booster pump. A desulfurizer for reducing sulfur compounds contained therein, a secondary liquid fuel tank for storing liquid fuel processed by the desulfurizer, and a fuel process for generating a gas containing a large amount of hydrogen from the liquid fuel processed by the desulfurizer In the fuel cell power generation system including the apparatus, a gas-liquid separator is provided on the downstream side of the desulfurizer, and the secondary liquid fuel tank is opened to the atmosphere.

  According to the present invention, a gas-liquid separator is provided between the desulfurizer and the secondary liquid fuel tank so that the flammable gas can be safely processed, and the desulfurized liquid fuel tank is opened to the atmosphere. The flow rate of the desulfurized liquid fuel supplied to the apparatus can be accurately controlled.

Hereinafter, the liquid fuel cell power generation system of the present invention will be described in more detail.
(1) As described above, the liquid fuel power generation system according to the present invention includes a primary liquid fuel tank, a liquid feeding booster pump, a desulfurizer, a secondary liquid fuel tank, and a fuel treatment device, and the desulfurizer A gas-liquid separator is provided on the downstream side, and the secondary liquid fuel tank is opened to the atmosphere.
(2) In the invention of the above (1), it is preferable that a recycle line for returning the liquid fuel introduced into the desulfurizer to the primary liquid fuel tank is provided between the primary liquid fuel tank and the gas-liquid separator. According to such a configuration, since the liquid fuel containing sulfur does not flow into the secondary liquid fuel tank, sulfur poisoning of the reformer can be prevented. Further, the combustible gas can be prevented from flowing into the primary liquid fuel tank, and the combustible gas can be safely processed. That is, it is possible to ensure the safety and extend the life of the fuel cell power generation system.

(3) In the above (1) or (2), it is preferable to further include a secondary liquid fuel tank overflow pipe for returning the liquid fuel overflowing from the secondary liquid fuel tank to the primary liquid fuel tank. According to such a configuration, since the liquid fuel that has overflowed the secondary liquid fuel tank returns to the primary liquid fuel tank, it is not necessary to install a level sensor, and the cost of the fuel cell power generation system can be reduced.
(4) In any one of the above (1) to (3), the primary liquid fuel tank and the secondary liquid fuel tank are an integral structure type tank partitioned by a weir, and the liquid overflowing from the secondary liquid fuel tank It is preferable that the fuel be returned to the primary liquid fuel tank. According to such a configuration, the secondary liquid fuel tank overflow pipe as described in the above (3) is not required, so that the device configuration is simple. Therefore, the cost of the fuel cell power generation system can be reduced and the package can be made compact.

(5) In any one of the above (1) to (4), the gas-liquid separator has a gas-liquid separator level meter for detecting that the liquid fuel liquid level has become a certain level or higher. It is preferable that the liquid fuel in the gas-liquid separator is returned to the primary liquid fuel tank when the meter detects the liquid fuel liquid level. According to such a configuration, the gas-liquid separator is filled with the liquid fuel, and it is possible to prevent the liquid fuel from flowing into the equipment installed downstream of the vent pipe and further the vent pipe.
(6) In the above (5), it is preferable that the fuel cell power generation system has a function of stopping when the level sensor continues for a certain period of time. According to such a configuration, the same effect as the above (5) can be obtained.

Next, embodiments of the present invention will be described with reference to the drawings. Note that the present embodiment is not limited to the following description.
Example 1
Please refer to FIG. The liquid fuel cell power generation system includes a primary liquid fuel tank 31 that stores liquid fuel, a liquid feed booster pump 32 that sends liquid fuel from the tank 31, and a desulfurizer that is connected to the pump 32 via a desulfurizer preheating means 33. 34, a gas-liquid separator 36 connected to the desulfurizer 34 via a pressure regulating valve 35, a secondary liquid fuel tank 38 connected to the gas-liquid separator 36 via a reformed fuel cutoff valve 37, A reformer (fuel processor) 39 and a fuel cell 40 are provided.

  An external liquid fuel tank 41 outside the package is connected to the primary liquid fuel tank 31. The reformer 39 is connected to the gas-liquid separator 36 via a vent pipe 43 provided with a vent pipe check valve 42, and is connected to a gas 45 via a pipe 45 provided with a reform fuel pump 44. The liquid separator 36 is connected. The reformer 39 mainly includes a reformer 39a, a carbon monoxide converter 39b, a carbon monoxide remover 39c, and a burner combustor 39d. The fuel cell 40 includes a fuel cell body 41 having an anode electrode 41a, a cathode electrode 41b, and a cooling water system 41c. In addition, the number 46 in a figure shows the 1st gas-liquid separator level meter provided in the bottom part of the gas-liquid separator 36. FIG. The external liquid fuel tank 41 is installed outside the fuel cell package 47.

  The liquid fuel is temporarily accumulated in an external liquid fuel tank 41 installed outside the fuel cell package 47 and guided to the primary liquid fuel tank 31. The liquid fuel in the liquid fuel tank 31 is drawn out by the liquid feed booster pump 32 and is pressurized and then sent to the desulfurizer 34. The liquid fuel supply pressure to the desulfurizer 34 is adjusted by a pressure regulating valve 35 installed downstream of the desulfurizer 34 as in the method described in Japanese Patent Application No. 2006-243084 filed earlier by the present applicant. The liquid fuel delivered from the liquid feed booster pump 32 is preheated to a temperature at which the desulfurization preheating means 33 can start the desulfurization reaction, and then introduced into the desulfurizer 34. The desulfurizer heating means 33 only needs to be able to adjust the temperature by raising the temperature of the liquid fuel sent out at room temperature from 150 ° C. to 300 ° C., and may be heated by an electric heater, combustion exhaust gas, steam, etc. Heat exchange may be performed.

  The liquid fuel desulfurized by the desulfurizer 34 is guided to a gas-liquid separator 36 installed downstream of the desulfurizer 34 together with a combustible gas which is a by-product of the desulfurization reaction. The liquid fuel and the combustible gas are separated by the gas-liquid separator 36, and the liquid fuel below the gas-liquid separator 36 is guided to the secondary liquid fuel tank 38 via the reformed fuel cutoff valve 37. Further, the combustible gas at the upper part of the gas-liquid separator 36 is guided to the burner combustion unit 39 d of the reformer 39 through the vent pipe 43 installed at the upper part of the gas-liquid separator 36.

  The liquid fuel guided to the secondary liquid fuel tank 38 is introduced into the reformer 39 by the reformed fuel supply pump 44 and reformed into a hydrogen rich gas, and then sent to the anode 41 a of the fuel cell main body 41. The secondary liquid fuel tank 38 is open to the atmosphere, and is always kept at atmospheric pressure. Many of the catalysts used in the reformer 39 are poisoned by sulfur and its activity is lowered. Therefore, it is desirable to reduce the sulfur concentration in the liquid fuel to several tens of ppb by the desulfurizer 34. The reformer 39a reforms the raw fuel to generate a hydrogen rich gas. In steam reforming, which is a typical reforming method, steam is mixed with raw fuel and passed through a catalyst layer heated to 500 to 700 ° C., whereby steam, carbon monoxide, dioxide dioxide containing hydrogen as a main component. Produces hydrogen-rich gas containing carbon. Since the steam reforming reaction is an endothermic reaction, it is necessary to heat from the outside in order to maintain the temperature and the reaction. Therefore, in the burner combustion section 39d, air, fuel, and an anode outlet gas described later are mixed and burned, and the combustion heat is transmitted to the reformer 39a to maintain the reforming reaction. The hydrogen rich gas at the outlet of the reformer 39a contains a large amount of carbon monoxide.

  Carbon monoxide is a factor that lowers the generated voltage at the anode 41a of the fuel cell body 41 downstream. Therefore, it is usual to reduce to 10 ppm or less by the shift reaction in the carbon monoxide converter 39b and the carbon monoxide selective oxidation reaction in the carbon monoxide remover 39c. The hydrogen rich gas derived from the reformer 39 is introduced into the fuel cell main body 41. In the fuel cell main body 41, an electrochemical reaction occurs between hydrogen in the hydrogen-rich gas introduced into the anode electrode 41a and oxygen in the air introduced into the cathode electrode 41b to generate DC electromotive force.

  The fuel cell unit is a power generation device that generates power using this direct-current electromotive force, but the power generation method is not within the scope of the present invention, and is therefore omitted. Since the anode 41a normally consumes 50% to 80% of the hydrogen in the hydrogen rich gas, the anode electrode outlet gas contains a combustible gas such as hydrogen. The anode electrode outlet gas discharged from the anode 41a is sent to the burner combustion section 39d, mixed with air and auxiliary fuel, and used for heating the reformer 39a.

The operation of the liquid fuel cell power generation system according to Example 1 will be described below.
In the liquid fuel cell power generation system of this configuration, the gas-liquid separator 36 is for separating the liquid fuel and the combustible gas into respective fluids, and the liquid fuel containing the combustible gas is the gas-liquid separator. The liquid fuel is separated into the lower part and the combustible gas is separated into the upper part. The lower liquid fuel is led to a secondary liquid fuel tank 38 installed at a position lower than the gas-liquid separator 36 by its own weight. Since the upper combustible gas is discharged from the vent pipe 43 installed at the upper portion of the gas-liquid separator 36 described above, before the liquid fuel and the combustible gas are introduced into the secondary liquid fuel tank 38. To be separated. Note that a mesh plate may be installed in the gas-liquid separator 36 in order to prevent liquid fuel from being entrained in the vent pipe 43 during separation. In order to prevent the liquid fuel in the lower part of the gas-liquid separator 38 from running out and the flammable gas from being introduced into the secondary liquid fuel tank 38, the gas-liquid separator level installed at the lower part of the gas-liquid separator 36 is used. When the total 46 is detected, the reformed fuel cutoff valve 37 is closed for a certain time, and the liquid fuel level is controlled so as to be always higher than the gas-liquid separator level total 46.

Next, effects of the liquid fuel cell power generation system according to Embodiment 1 will be described.
The combustible gas, which is a by-product of the desulfurization reaction, is separated from the liquid fuel before being introduced into the secondary liquid fuel tank 38, so that the combustible gas and the atmosphere can be prevented from being mixed into the secondary liquid fuel tank 38. Therefore, the secondary liquid fuel tank 38 can be opened to the atmosphere. When the secondary liquid fuel tank 38 is a sealed space, the pressure of the secondary liquid fuel tank 38 decreases due to a decrease in the liquid level of the liquid fuel stored in the secondary liquid fuel tank 38, and the pressure is less than atmospheric pressure. However, the above problem can be solved by opening the secondary liquid fuel tank 38 to the atmosphere. In addition, since the inlet pressure of the reformed fuel supply pump 44 can be kept constant at all times, the liquid to the stable reforming device 39 can be maintained without installing a liquid fuel flow meter downstream of the reformed fuel supply pump 44. Fuel supply becomes possible. That is, it is possible to extend the life of the fuel cell power generation system. The secondary liquid fuel tank 38 may be a constant oil level device used for general kerosene equipment.

(Example 2)
Please refer to FIG. However, the same members as those in FIG. Reference numeral 51 in the figure indicates a liquid fuel recycle line connecting the gas-liquid separator 36 and the primary liquid fuel tank 31, and a liquid fuel recycle cutoff valve 52 is interposed. The attachment position of the liquid fuel recycle line 51 to the gas-liquid separator 36 is located below the liquid level in the gas-liquid separator.

The operation of the liquid fuel cell power generation system according to this embodiment will be described below.
When the liquid fuel cell power generation system is activated, if the desulfurizer 34 does not reach the predetermined temperature and pressure, the desulfurization performance is not sufficiently exhibited, so that liquid fuel containing sulfur may flow into the secondary liquid fuel tank 38. Therefore, it is desirable to return to the primary liquid fuel tank 31. However, if the downstream of the desulfurizer 34 and the primary liquid fuel tank 31 are connected without the gas-liquid separator 36, the above-described combustible gas flows into the primary liquid fuel tank 31. . In addition, when the temperature of the desulfurizer when the liquid fuel cell power generation system is stopped is, for example, 200 ° C. or higher, it is desirable to maintain the pressure of the desulfurizer 34 with the liquid feed booster pump 32 operated. However, since the temperature of the desulfurizer 34 is lowered, the desulfurization performance is not sufficiently exhibited as described above, and liquid fuel containing sulfur may flow into the secondary liquid fuel tank 38.

  According to the second embodiment, since liquid fuel containing sulfur does not flow into the secondary liquid fuel tank 38, sulfur poisoning of the reformer 39 can be prevented. Further, the combustible gas can be prevented from flowing into the primary liquid fuel tank 31, and the combustible gas can be safely processed. That is, it is possible to ensure the safety and extend the life of the fuel cell power generation system.

(Example 3)
Please refer to FIG. However, the same members as those in FIG. 1 and FIG. Reference numeral 53 in the drawing indicates a secondary liquid fuel tank overflow pipe connecting the upper part of the secondary liquid fuel tank 38 and the upper part of the primary liquid fuel tank 31. The primary liquid fuel tank 31 is open to the atmosphere.

The operation of the liquid fuel cell power generation system according to Example 3 will be described below.
As described above, it is desirable to open the secondary liquid fuel tank 38 to the atmosphere. However, for example, when the liquid fuel overflows in the secondary liquid fuel tank 38, the liquid fuel leaks from the secondary liquid fuel tank 38 to the inside of the plant. It is necessary to prevent leakage of liquid fuel.

  According to the third embodiment, since the primary liquid fuel tank 31 is open to the atmosphere, the secondary liquid fuel tank 38 can also maintain the atmospheric pressure. Therefore, as described above, the liquid to the stable reformer 39 can be maintained. Fuel supply becomes possible. Further, since the liquid fuel that has overflowed the secondary liquid fuel tank 38 returns to the primary liquid fuel tank 31, it is not necessary to install a level sensor, and the cost of the fuel cell power generation system can be reduced.

Example 4
Please refer to FIG. However, the same members as those in FIG. 1 and FIG. Reference numeral 54 in the drawing indicates an integral structure tank in which the primary liquid fuel tank 31 and the secondary liquid fuel tank 38 are integrated. In FIG. 4, the secondary liquid fuel tank overflow pipe of FIG. 3 is deleted. The liquid fuel overflowing from the secondary liquid fuel tank 38 is returned to the primary liquid fuel tank 31. Also, reference numeral 55 in FIG. 4 indicates a weir that partitions the integral structure tank 54 into the primary liquid fuel tank 31 and the secondary liquid fuel tank 38.

  In order to prevent undesulfurized liquid fuel from flowing from the primary liquid fuel tank 31 to the secondary liquid fuel tank 38, the primary liquid fuel tank 31 has a constant oil level structure often used in general kerosene equipment, and the primary liquid. When the fuel tank 31 is full, the upper cover of the primary liquid fuel tank 31 may be mechanically closed. For the same purpose, a level sensor may be installed on the upper part of the primary liquid fuel tank 31 to prevent liquid fuel from flowing from the primary liquid fuel tank 31 to the secondary liquid fuel tank 38 in advance.

The operation of the liquid fuel cell power generation system according to the fourth embodiment is the same as that of the third embodiment.
According to the fourth embodiment, the secondary liquid fuel tank overflow pipe installed in the third embodiment is not required, so that a simple device configuration can be achieved, the cost of the fuel cell power generation system can be reduced, and the package can be made compact. Can be achieved.

(Example 5)
Please refer to FIG. However, the same members as those shown in FIGS. Reference numeral 56 in the figure indicates a second gas-liquid separator level meter installed at the upper part of the gas-liquid separator 36.
The operation of the liquid fuel cell power generation system according to Example 5 will be described below.
The liquid fuel recycle shut-off valve 52 is opened when it is detected that the liquid fuel liquid level of the gas-liquid separator 36 has risen and the second gas-liquid separator level meter 55 has reached a certain level or higher. By returning the liquid fuel accumulated in the gas-liquid separator 36 to the primary liquid fuel tank 31, the gas-liquid separator 36 is filled with the liquid fuel, and the liquid fuel is prevented from flowing into the vent pipe 43. In addition, since it is desirable that the liquid fuel returns to the primary liquid fuel tank 31 at the same time when the liquid fuel recycle shut-off valve 52 is opened, the diameter of the liquid fuel recycle line 52 in this case is desirably ¼ inch or more. Further, when the second gas-liquid separator level meter 55 continues to detect and a certain time has elapsed, the plant is stopped for safety.
According to the fifth embodiment, the gas-liquid separator 36 is filled with the liquid fuel, and the liquid fuel can be prevented from flowing into the equipment installed downstream of the vent pipe 43 and further the vent pipe 43.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

An explanatory view of a liquid fuel cell power generation system concerning Example 1 of the present invention is shown. An explanatory view of a liquid fuel cell power generation system concerning Example 2 of the present invention is shown. An explanatory view of a liquid fuel cell power generation system concerning Example 3 of the present invention is shown. An explanatory view of a liquid fuel cell power generation system concerning Example 4 of the present invention is shown. An explanatory view of a liquid fuel cell power generation system concerning Example 5 of the present invention is shown. An explanatory view of a conventional fuel cell system is shown. An explanatory view of a conventional hydrogen production apparatus is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 31 ... Primary liquid fuel tank, 32 ... Liquid feeding pressure booster, 33 ... Desulfurizer preheating means, 34 ... Desulfurizer, 35 ... Pressure regulating valve, 36 ... Gas-liquid separator, 37 ... Reformed fuel cutoff valve, 38 ... Two Next liquid fuel tank, 39 ... reforming device, 40 ... fuel cell, 41 ... external liquid fuel tank, 42 ... air vent pipe check valve, 43 ... air vent pipe, 44 ... reformed fuel pump, 46 ... first Gas liquid-liquid separator level meter, 51 ... liquid fuel recycle line, 52 ... liquid fuel recycle shut-off valve, 53 ... secondary liquid fuel tank overflow piping, 54 ... integrated structure tank, 56 ... second gas-liquid separator level Total.

Claims (6)

A primary liquid fuel tank for storing liquid fuel, a liquid feed booster pump for sending liquid fuel from the primary liquid fuel tank, a desulfurizer for reducing sulfur compounds contained in the liquid fuel sent from the liquid feed booster pump, In a liquid fuel cell power generation system comprising a secondary liquid fuel tank that stores liquid fuel treated by the desulfurizer, and a fuel treatment device that generates a gas containing a large amount of hydrogen from the liquid fuel treated by the desulfurizer,
A liquid fuel cell power generation system, wherein a gas-liquid separator is provided downstream of the desulfurizer, and the secondary liquid fuel tank is opened to the atmosphere. The liquid fuel cell power generation according to claim 1, wherein a recycle line for returning the liquid fuel introduced into the desulfurizer to the primary liquid fuel tank is provided between the primary liquid fuel tank and the gas-liquid separator. system. 3. The liquid fuel cell power generation system according to claim 1, further comprising a secondary liquid fuel tank overflow pipe for returning the liquid fuel overflowing from the secondary liquid fuel tank to the primary liquid fuel tank. 4. . The primary liquid fuel tank and the secondary liquid fuel tank are an integral structure type tank partitioned by a weir, and the liquid fuel overflowing from the secondary liquid fuel tank is configured to return to the primary liquid fuel tank. The liquid fuel cell power generation system according to any one of claims 1 to 3. The gas-liquid separator has a gas-liquid separator level meter for detecting the liquid fuel liquid level, and when the level gauge detects the liquid fuel liquid level, the liquid fuel in the gas-liquid separator is primarily used. The liquid fuel cell power generation system according to any one of claims 1 to 4, wherein the liquid fuel cell power generation system is configured to be returned to the liquid fuel tank. 6. The liquid fuel cell power generation system according to claim 5, wherein the fuel cell power generation system has a function of stopping the fuel cell power generation system when the detection of the gas-liquid separator level meter continues for a certain period of time.

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