WO2018083792A1

WO2018083792A1 - Pipe blockage prevention method and pipe blockage prevention system

Info

Publication number: WO2018083792A1
Application number: PCT/JP2016/082936
Authority: WO
Inventors: 泰孝和田; 昭史中村; 幸彦松村; 良文川井; 琢史野口
Original assignee: 中国電力株式会社; 国立大学法人広島大学; 中電プラント株式会社; 株式会社東洋高圧
Priority date: 2016-11-07
Filing date: 2016-11-07
Publication date: 2018-05-11
Also published as: JPWO2018083792A1; JP6414868B2

Abstract

The purpose of the present invention is to reliably prevent blockage of pipes. The present invention is characterized in that, in a pipe in which a viscous body or a solid derived from a fluid 37 flowing in a pressurized state adheres as a deposit 65 to a predetermined range along the flow direction on the inner walls of the pipe, the deposit 65 is discharged from the pipe as a consequence of the opening of a valve 61 attached in the vicinity of the predetermined range when a first pressure that is the pressure on the upstream side of the predetermined range is no less than a predetermined allowable value.

Description

Piping blockage prevention method and piping blockage prevention system

The present invention relates to a pipe blockage prevention method and a pipe blockage prevention system for removing a viscous body or solidified material adhering to a pipe and reliably preventing the pipe from being blocked.

A system for obtaining energy by processing predetermined raw materials at high temperature and high pressure has been developed. For example, Patent Document 1 discloses that a biomass slurry containing a nonmetallic catalyst is hydrothermally treated in a predetermined reactor under conditions of a temperature of 374 ° C. or higher and a pressure of 22.1 MPa or higher, and the generated product gas is used. A biomass gasification system is described in which power is generated by a power generation device and the slurry body is heated using exhaust heat from the power generation device.

JP 2008-246343 A

In such a gasification system, high-temperature and high-pressure treated water is heat-exchanged with the slurry body in a heat exchanger. In the pipe of this heat exchanger, tar or char derived from raw materials (in the above, biomass), etc. A sticky substance or solidified product adheres. Viscous materials and solidified substances adhere to straight pipe portions and curved portions of piping. In particular, it is known that, in a curved portion, a viscous material or a solidified substance easily adheres to an inner surface on the outer peripheral side in a portion where the bending starts (upstream side) or an inner peripheral side inner surface in a portion where the bending ends (downstream side). The cause of the adhesion is considered to be that the slurry body collides with and adheres to the inner surface on the outer peripheral side, and that stagnation is likely to occur on the inner peripheral side inner surface on the downstream side of the curved pipe, and the flow rate is lowered and tends to stay.

In such a place where the slurry body stays, the viscous body and the solidified material accumulate, and the circulation of the slurry body in the piping may be hindered, which may reduce the gas yield. Furthermore, if the viscous material or solidified material accumulates and the piping is blocked, the gasification equipment may be damaged.

The present invention has been made in view of such a current situation, and an object of the present invention is to prevent a blockage of a pipe and a pipe for reliably preventing the blockage of the pipe by removing the viscous material or solidified substance adhering to the pipe. The object is to provide an occlusion prevention system.

One aspect of the present invention for achieving the above-mentioned object is a pipe in which a viscous material or a solidified material derived from a fluid flowing in a pressurized state adheres as a deposit to a predetermined range of the flow direction on the inner wall surface thereof. When the first pressure, which is the pressure on the upstream side of the predetermined range, is greater than or equal to a predetermined allowable value, the attached matter is discharged from the pipe by opening a valve attached in the vicinity of the predetermined range. It is characterized by.

If there is a sticky substance or solidified substance derived from the fluid flowing through the pipe on the inner wall surface of the pipe, the pressure on the upstream side of the attached range is considered to have increased. Therefore, as in the present invention, when the first pressure, which is the pressure upstream of the adhesion range of the deposit, is equal to or greater than a predetermined allowable value, by opening the valve attached in the vicinity of the adhesion range, The deposit can be effectively discharged from the pipe at a timing before the pipe is blocked by the deposit. Thereby, obstruction | occlusion of piping can be prevented reliably.

In the present invention, the valve may be opened and the valve may be closed after a predetermined time has elapsed. Further, after opening the valve, the valve may be closed when the first pressure becomes lower than a predetermined value. From these, the unnecessary outflow of the fluid flowing through the piping can be prevented.

In another aspect of the present invention, in a pipe in which a viscous material or solidified substance derived from a fluid flowing in a pressurized state adheres to a predetermined range in the flow direction on the inner wall surface as an adhering substance, an upstream of the predetermined range. When the first pressure that is the pressure on the side is higher than the second pressure that is the pressure on the downstream side of the predetermined range by a predetermined allowable value or more, the valve attached in the vicinity of the predetermined range is opened. Thus, the deposit is discharged from the pipe.

When a viscous material or solidified substance deposit derived from the fluid flowing in the pipe is attached to the inner wall surface of the pipe, the pressure between the fluid on the upstream side and the downstream side of the attachment range Therefore, a pressure difference is generated. Therefore, as in the present invention, when the first pressure is higher than the second pressure, which is the pressure downstream of the adhesion range, by a predetermined allowable value or more, the valve attached in the vicinity of the adhesion range is opened. Thus, the deposit can be reliably discharged from the pipe at a timing before the pipe is blocked by the deposit. Thereby, obstruction | occlusion of piping can be prevented reliably.

Moreover, in the said invention, the pressure loss of the said fluid which generate | occur | produced in the said predetermined range is calculated based on the physical-property value of the said fluid, and the said 1st pressure is based on the calculated pressure loss rather than the said 2nd pressure. The valve may be opened when it is higher than the set allowable value. For example, the pressure loss of the fluid generated in the predetermined range is calculated based on the flow velocity and density of the fluid. In this way, by calculating the pressure loss based on the physical properties such as the flow velocity and density of the fluid and setting the allowable value of the difference between the first pressure and the second pressure, the valve can be operated at an appropriate timing before the pipe is blocked. Can be opened.

In the above invention, the fluid resistance of the fluid flowing through the predetermined range is calculated based on the flow velocity of the fluid, and the first pressure is set based on the calculated fluid resistance rather than the second pressure. When the value is higher than the allowable value, the valve may be opened. In this way, by calculating the fluid resistance of the fluid flowing in the adhesion range of the deposit and setting the allowable value of the difference between the first pressure and the second pressure, the valve is opened at an appropriate timing before the pipe is blocked. can do.

Further, in the above invention, the heat exchanger including the pipe through which a biomass slurry as the fluid flows as an inner pipe, and the pipe through which a high-temperature fluid that exchanges heat with the slurry as an outer pipe, and the heat exchange are provided. A gasification reactor that heats the slurry body sent from a vessel to gasify the slurry body, and sends the slurry body after the gasification to the outer pipe as the high-temperature fluid; In the gasification system provided, when the first pressure is higher than the second allowable pressure by the predetermined allowable value or more, by opening the valve provided in the vicinity of the predetermined range, the deposit May be discharged from the inner pipe.

As in the present invention, in a gasification system that performs gasification by a heat exchanger, when the first pressure of the inner tube of the heat exchanger is higher than a second tolerance by a predetermined allowable value or more, By opening the valve in the vicinity of the adhesion range, the deposits in the inner pipe can be effectively discharged from the inner pipe. Thereby, obstruction | occlusion of the inner tube | pipe in a heat exchanger can be prevented.

In the present invention, when the first pressure is higher than the second allowable value by more than the predetermined allowable value, the deposits are opened by opening the valve provided in the vicinity of the predetermined range. May be discharged from the inner tube, and the high-temperature fluid flowing through the outer tube may be discharged to the outside.

When the deposit on the inner tube of the heat exchanger is discharged, the slurry body is also discharged at the same time, so the inner tube through which the slurry body flows is subjected to the pressure of the high-temperature fluid flowing through the outer tube, and as a result, the heat exchanger can be damaged There is sex. Therefore, as in the present invention, the deposits are discharged from the inner tube, and the high-temperature fluid flowing through the outer tube is discharged to the outside, thereby reducing the pressure difference between the inner tube and the outer tube, and damaging the heat exchanger. Can be prevented.

In the above invention, when the first pressure is higher than the second allowable pressure by the predetermined allowable value, the pressure difference of the high-temperature fluid in the outer pipe in the vicinity of the predetermined range is a predetermined value or more. If it is higher, the valve attached to the vicinity of the predetermined range is opened to discharge the deposit from the inner pipe and to discharge the high-temperature fluid flowing through the outer pipe to the outside. Also good.

As in the present invention, when the pressure difference of the high temperature fluid in the outer pipe is equal to or greater than a predetermined value, the valve of the inner pipe is opened and the high temperature fluid is discharged from the outer pipe, thereby While preventing the heat exchanger from being damaged due to a large pressure difference, the burden of maintenance management for maintenance personnel and the like is also reduced.

In each of the above inventions, the predetermined range is, for example, a curved portion of a pipe through which the fluid flows. Since deposits easily adhere to the curved portion of the pipe, according to the present invention, blockage of the pipe can be more effectively prevented.

Further, another one of the present invention is an inner tube in which a viscous body or a solidified material derived from a slurry body of biomass flowing in a pressurized state adheres to a predetermined range of the flow direction on the inner wall surface as an adhering matter, A heat exchanger comprising an outer pipe that is a pipe through which a high-temperature fluid to be heat-exchanged with the slurry body, and heating the slurry body sent from the heat exchanger to gasify the slurry body, and A pipe clogging prevention system in a gasification system comprising a gasification reactor that delivers the slurry body after gasification to the outer pipe as the high-temperature fluid, the pressure being upstream of the predetermined range When the first pressure is higher than the second allowable pressure, which is the pressure downstream of the predetermined range, by opening the valve provided near the predetermined range, The deposits with discharges from the inner tube, characterized by further comprising a data processing apparatus having a function of discharging the hot fluid flowing through the outer tube to the outside.

According to the present invention, in the pipe clogging prevention method and the pipe clogging prevention system, it is possible to reliably prevent clogging of the pipe by removing the viscous material or solidified substance adhering to the pipe.

It is a figure explaining the composition of the gasification system concerning a 1st embodiment. It is a figure which shows the structure of the double pipe. 3 is a diagram showing a detailed configuration of a heat exchanger 31. FIG. It is the figure which represented typically the structure of the slurry body delivery pipe | tube 52 and its periphery. It is an example of the deposit | attachment 65 (tar or char) adhering to the inner wall face of the slurry body delivery pipe | tube 52. FIG. It is a flowchart explaining the removal method of the deposit | attachment 65. FIG. It is the figure which showed the mode of the slurry body delivery pipe | tube 52 at the time of opening the 1st valve 61 at the time of opening the 1st valve 61, and its periphery. 3 is a diagram showing a detailed configuration of a heat exchanger 31. FIG. It is the figure which represented typically the structure of the slurry body delivery pipe | tube 52 and its periphery. It is a flowchart explaining the removal method of the deposit | attachment 65. FIG. It is the figure which represented typically the structure of the slurry body delivery pipe | tube 52 and its periphery. It is a flowchart explaining the removal method of the deposit | attachment 65. FIG. It is the figure which showed the structure of the heat exchanger 31 typically. It is a flowchart explaining the removal method of the deposit | attachment 65. FIG. It is the figure which represented typically the structure of the slurry body delivery pipe | tube 52 and its periphery. It is the figure which showed the curved part 64 of the slurry body delivery pipe | tube 52 for demonstrating the parameter Ac. It is the figure which showed the relationship between A2 / A1, Cc, and (zeta). It is the figure which showed the relationship between (zeta), Cc, and A2 / A1. It is a figure explaining the structure of the inner tube | pipe 35 and the outer tube | pipe 36 in the heat exchanger 31. FIG. 3 is a diagram showing a detailed configuration of a heat exchanger 31. FIG. It is a figure explaining the gasification system 10 comprised so that pressure measurement and valve opening / closing may be performed automatically. It is a figure which shows the positional relationship of a pressure gauge and a valve | bulb.

<First Embodiment>
FIG. 1 is a diagram illustrating a configuration of a gasification system 10 according to the first embodiment. This gasification system 10 is a system that generates a combustion gas by preparing a slurry body from biomass such as shochu residue, egg-collecting chicken manure, sludge, etc., and heating and pressurizing the prepared slurry body.

As shown in the figure, the gasification system 10 includes a raw material preparation unit 20, a heat treatment unit 30, and a gas processing unit 40, which are connected by various pipes.

Among these, the raw material preparation part 20 is a part which prepares a slurry body from biomass. The raw material preparation unit includes a preparation tank 21, a pulverizer 22, a supply pump 23, and a heat exchanger introduction pump 24.

The preparation tank 21 is a tank that mixes biomass, water, and a catalyst (in this embodiment, activated carbon), thereby preparing a mixed solution. For example, porous particles having an average particle diameter of 200 μm or less are used as the activated carbon. The mixing ratio of the liquid, water, and activated carbon is adjusted according to the type, amount, moisture content, etc. of biomass.

The pulverizer 22 is an apparatus for crushing the solid content of the mixed liquid obtained in the preparation tank 21 to obtain a uniform size (preferably an average particle size of 500 μm or less, more preferably an average particle size of 300 μm or less). It is. By processing with this grinder 22, a liquid mixture becomes a slurry body.

The supply pump 23 supplies the slurry discharged from the pulverizer 22 to the heat exchanger introduction pump 24. Further, the heat exchanger introduction pump 24 pressurizes the slurry body sent from the supply pump and supplies it to the heat treatment section 30 through the slurry body introduction pipe 51.

The heat treatment part 30 is a part that heats and gasifies the slurry body sent from the raw material preparation part 20. The heat treatment unit 30 includes a heat exchanger 31, a heater 32, and a gasification reactor 33. Among these, the heat exchanger 31 includes a double pipe 34, the slurry body sent from the slurry body introduction pipe 51 is heated in a pressurized state in the double pipe 34, and the heated slurry body is fed to the slurry body delivery pipe 52. To send. In the heat exchanger 31, a post-treatment fluid 38 (described later) that is a high-temperature fluid that exchanges heat with the slurry body flows into the double pipe 34 through the post-treatment fluid introduction pipe 53. The treated fluid 38 heat-exchanged with the slurry body 37 in the double pipe 34 is discharged to the treated fluid discharge pipe 54.

FIG. 2 is a diagram showing the structure of the double pipe 34. As shown in the figure, the double tube 34 includes an inner tube 35 and an outer tube 36. The inner tube 35 has a thickness of about 1 mm, and the outer tube 36 has a thickness of about 1 mm. A slurry body 37 flows through the inner tube 35. A post-treatment fluid 38 that has flowed in a supercritical state from the gasification reactor 33 via the post-treatment fluid introduction pipe 53 flows through the outer pipe 36. In the double pipe 34, the slurry body 37 is heated by exchanging heat with the processed fluid 38. The heated slurry body 37 is sent to the slurry body delivery pipe 52, while the post-treatment fluid 38 heat-exchanged with the slurry body 37 is discharged to the post-treatment fluid discharge pipe 54.

The temperature when the slurry body 37 is introduced into the heat exchanger 31 is, for example, about 25 ° C. Moreover, the temperature when the slurry body 37 is sent out from the heat exchanger 31 is about 450 ° C., for example. On the other hand, the temperature when the treated fluid 38 is introduced into the heat exchanger 31 is, for example, about 600 ° C., and the temperature when the treated fluid 38 is discharged from the heat exchanger 31 is, for example, about 120 ° C.

As shown in FIG. 1, the heater 32 is a device for heating the slurry body 37 sent from the heat exchanger 31. The heater 32 includes a combustion device 32a. Combustion gas (described later) sent from the gas processing unit 40 together with liquefied petroleum gas LPG (Liquefied Petroleum Gas) and air is combusted by the combustion device 32a, and a slurry body 37 is obtained. Heat. Thereby, the temperature of the slurry body 37 introduced into the heater 32 is raised to about 600 ° C., for example. The heated slurry body 37 is sent to the gasification reactor 33.

The gasification reactor 33 is a device that heats the slurry body 37 sent from the heater 32 and hydrothermally heats the organic matter contained in the slurry body 37 to gasify it. The gasification reactor 33 is provided with a combustion device 33a, and the combustion gas sent from the gas processing unit 40 together with the liquefied petroleum gas LPG and air is combusted by the combustion device 33a, and the hydrothermal treatment of the slurry body 37 is performed. Do. In the gasification reactor 33, the slurry body 37 is held for 1 to 2 minutes under conditions of, for example, 600 ° C. and 25 MPa. The slurry body 37 after being gasified by hydrothermal treatment is a high-temperature fluid, and is sent to the heat exchanger 31 as the post-treatment fluid 38 described above.

The gas processing unit 40 includes a decompression mechanism 41, a gas-liquid separator 42, a catalyst recovery unit 43, and a gas tank 44.

Among these, the decompression mechanism 41 decompresses the treated fluid 38 discharged from the heat exchanger 31 via the treated fluid delivery pipe 54. The gas-liquid separator 42 separates the processed fluid 38 sent from the decompression mechanism 41 into a liquid (a liquid containing activated carbon or ash) and a gas (a gas such as hydrogen or methane). Of these, the liquid is treated as waste and sent to the catalyst recovery unit 43, while the gas is sent to the gas tank 44. The gas tank 44 stores the gas sent from the gas-liquid separator 42. The temperature of the gas in the gas tank 44 is about 30 ° C. The gas stored in the gas tank 44 is supplied to the heater 32 and the gasification reactor 33 as the fuel gas described above.

Next, the details of the heat exchanger 31 will be described.
FIG. 3 is a diagram showing a detailed configuration of the heat exchanger 31. As shown in the figure, the heat exchanger 31 is a double pipe that extends spirally from the lower side to which the slurry body introduction pipe 51 is connected to the upper side to which the slurry body delivery pipe 52 is connected. 34 is provided. In addition, in the same figure, although the outer periphery of each layer which the spiral of the double pipe | tube 34 forms is a rectangular shape, it is not restricted to the said shape.

The slurry body introduction pipe 51 is connected to the inner pipe 35 of the double pipe 34 via the branch member 55, and both are communicated with each other. Further, the branch member 55 connects the lower end of the outer tube 36 of the double tube 34 and the post-treatment fluid delivery tube 54 so as to communicate with each other. As a result, the slurry body 37 from the slurry body introduction pipe 51 is sent to the inner pipe 35 of the double pipe 34, and the processed fluid 38 discharged from the outer pipe 36 of the double pipe 34 is sent out after the processing fluid. The pressure reduction mechanism 41 is sent via a pipe 54.

On the other hand, the slurry body delivery pipe 52 is connected to the inner pipe 35 of the double pipe 34 via the branch member 56, and both are in communication. Further, the branch member 56 connects the upper end of the outer tube 36 of the double tube 34 and one end of the post-treatment fluid introduction tube 53 so as to communicate with each other. As a result, the slurry body 37 discharged from the inner pipe 35 is sent to the heater 32 via the slurry body delivery pipe 52, and the post-treatment fluid 38 is passed through the post-treatment fluid introduction pipe 53. To the outer pipe 36. The other end of the slurry body delivery pipe 52 is connected to the heater 32 via a connection member 62, and the other end of the treated fluid introduction pipe 53 is connected to the gasification reactor 33 via a connection member 63. (Not shown).

Here, as shown in FIG. 3, the slurry body delivery pipe 52 is provided with a first pressure gauge 58 and a first valve 61 in order from the upstream side.

FIG. 4 is a diagram schematically showing the structure of the slurry body delivery pipe 52 and its surroundings. At various locations on the inner wall surface of the slurry body delivery pipe 52, a viscous material or solidified material (for example, tar or char as shown in FIG. .) Adheres. In particular, as shown in the figure, the deposit 65 is likely to adhere to the back side inner wall surface 64 a of the curved portion 64 of the slurry body delivery pipe 52. Similarly, the deposit 65 is likely to adhere to the abdomen inner wall surface 64b on the downstream side of the curved portion 64.

Here, a first pressure gauge 58 is provided on the upstream side of the curved portion 64 of the slurry body delivery pipe 52. Further, a branch pipe (hereinafter referred to as a deposit discharge pipe 66) is provided on the downstream side of the curved portion 64 in the slurry body delivery pipe 52. A first valve 61 that can be opened and closed is provided in the middle of the deposit discharge pipe 66 for discharging the deposit 65. The first valve 61 is normally in a closed state (C).

FIG. 6 is a flowchart illustrating a method for removing the deposit 65 using the first pressure gauge 58 and the first valve 61. As shown in the figure, the maintenance staff of the gasification system 10 starts the gasification system 10 (S0: YES), and then the pressure (hereinafter referred to as the first pressure gauge 58) of the first pressure gauge 58 at a predetermined or arbitrary timing. 1 pressure (denoted as P1 in the drawing) is measured (S1). When the measured first pressure is equal to or higher than the predetermined pressure Pmax (S2: YES), the first valve 61 is opened (S3).

Note that Pmax is, for example, the first pressure (or a slightly lower pressure) immediately before the curved portion 64 is blocked by the deposit 65, and is determined empirically.

FIG. 7 is a view showing the state of the slurry body delivery pipe 52 and its surroundings when the first valve 61 is opened. As shown in the figure, when the first valve 61 is opened (indicated as O in the drawing), the adhering matter 65 adhering to the inner wall of the curved portion 64 of the slurry body delivery pipe 52 is increased by the internal pressure of the curved portion 64. The deposit 65 is peeled off from the inner wall by the pressure difference from the atmospheric pressure, and the peeled off deposit 65 is discharged to the outside from the deposit discharge pipe 66.

After opening the first valve 61 and waiting for a certain time (S4 in FIG. 6), the first valve 61 is closed (S45), and the first pressure is measured by the first pressure gauge 58 (S5). And when the measured 1st pressure is more than said pressure Pmax (S6: YES), the operation | work (S3) which opens the 1st valve | bulb 61 is repeated. On the other hand, when the first pressure is not equal to or higher than the pressure Pmax (S6: NO), the operation of measuring the first pressure is repeated (S1). As described above, the first valve 61 is opened and then waited. When the first pressure becomes lower than the predetermined value, the first valve 61 is closed to prevent the slurry body 37 from being unnecessarily discharged.

As described above, in the case where the adherent 65 of the viscous body or the solidified material derived from the fluid (slurry body 37) flowing through the pipe is attached to the inner wall surface of the pipe (slurry body delivery pipe 52), the adhesion range ( It is believed that the pressure upstream of the bend 64) is rising due to the deposit 65. Therefore, as in the present embodiment, when the first pressure, which is the pressure on the upstream side of the adhesion range of the deposit 65, is equal to or higher than a predetermined allowable value (Pmax), a valve ( By opening the first valve 61), the deposit 65 can be effectively discharged from the pipe at a timing before the pipe is blocked by the deposit 65. Thereby, obstruction | occlusion of piping can be prevented reliably.

Moreover, by opening the first valve 61, inorganic salts derived from inorganic components (calcium, sodium, potassium, etc.) contained in the slurry body 37 can be removed at the same time.

In the present embodiment, the first valve 61 and the first pressure gauge 58 are provided in the vicinity of the slurry body delivery pipe 52. However, any pipe that may be attached with the deposit 65 is attached to the slurry body delivery pipe 52. For example, the first valve 61 and the first pressure gauge 58 may be provided in the slurry body introduction pipe 51 and various other pipes. Further, since the deposit 65 may adhere not only to the curved portion 64 but also to the straight pipe portion of the pipe, the first valve 61 and the first pressure gauge 58 may be attached to the straight pipe portion.

Second Embodiment
FIG. 8 is a diagram illustrating a detailed configuration of the heat exchanger 31 according to the second embodiment. As shown in the figure, the difference between the second embodiment and the first embodiment is that a second pressure gauge 59 is attached to the slurry body delivery pipe 52.

FIG. 9 is a diagram schematically showing the structure of the slurry body delivery pipe 52 and its surroundings. As shown in the figure, a first pressure gauge 58 is attached to the upstream side of the curved portion 64 of the slurry body delivery pipe 52, and a second pressure gauge 59 is attached to the downstream side of the curved portion 64. . A deposit discharge pipe 66 that is a branch pipe from the slurry body delivery pipe 52 is provided on the downstream side of the second pressure gauge 59. A first valve 61 that can be opened and closed is provided in the middle of the deposit discharge pipe 66. The first valve 61 is normally in a closed state (C).

FIG. 10 is a flowchart illustrating a method for removing the deposit 65 according to the second embodiment. As shown in the figure, the maintenance staff or the like of the gasification system 10 starts the gasification system 10 (S10: YES), and then the pressure (first pressure) of the first pressure gauge 58 at a predetermined or arbitrary timing. ) And the pressure (second pressure) of the second pressure gauge 59 (S11). If the measured first pressure is not higher than the second pressure by a predetermined value ΔP or more (S12: NO), the pressure of the first pressure gauge 58 (first pressure) and the pressure of the second pressure gauge 59 The operation of measuring (second pressure) is repeated (S11), but when the measured first pressure is higher than the second pressure by a predetermined value ΔP (S12: YES), the first valve 61 is turned on. Open (S13). When the first valve 61 is opened, as in the first embodiment, the deposit 65 attached to the inner wall of the curved portion 64 of the slurry body delivery pipe 52 is caused by the pressure difference between the internal pressure of the curved portion 64 and the atmospheric pressure. The deposit 65 peeled off from the inner wall is discharged from the deposit discharge pipe 66 to the outside.

Note that ΔP is, for example, a differential pressure (or a slightly lower pressure value) between the first pressure and the second pressure immediately before the curved portion 64 is blocked by the deposit 65, and is determined empirically.

When the first valve 61 is opened, the first valve 61 is closed again (S14). Then, the first pressure gauge 58 and the second pressure gauge 59 measure the first pressure and the second pressure, respectively (S15). If the measured first pressure is higher than the second pressure by ΔP or more (S16: YES), the operation of opening the first valve 61 (S13) is repeated. On the other hand, when the first pressure is not higher than ΔP by more than ΔP (S16: NO), the operation of measuring the first pressure and the second pressure (S11) is repeated.

In the present embodiment, in the case where a sticky substance 65 or a viscous substance derived from a fluid (slurry body 37) flowing through the pipe is attached to the inner wall surface of the pipe (slurry body delivery pipe 52), the attachment range thereof. There is a pressure difference due to the deposit 65 between the pressure of the fluid on the upstream side and the downstream side of the (curved portion 64). Therefore, when the first pressure is higher than the second pressure, which is the pressure downstream of the adhesion range, by a predetermined allowable value or more, the valve (first valve 61) provided near the adhesion range is opened. By doing so, the deposit 65 can be reliably discharged from the pipe at a timing before the pipe is blocked by the deposit 65. Thereby, obstruction | occlusion of piping can be prevented reliably.

In the present embodiment, the first valve 61, the first pressure gauge 58, and the second pressure gauge 59 are provided in the vicinity of the slurry body delivery pipe 52. The first valve 61, the first pressure gauge 58, and the second pressure gauge 59 may be provided not only in the slurry body delivery pipe 52 but also in the slurry body introduction pipe 51 and other various pipes. Further, since the deposit 65 may adhere not only to the curved portion 64 but also to the straight pipe portion of the pipe as in the present embodiment, the first valve 61 and the first pressure gauge are attached to such a straight pipe portion. 58 and a second pressure gauge 59 may be provided.

<Third Embodiment>
FIG. 11 is a diagram schematically illustrating the structure of the slurry body delivery pipe 52 and the periphery thereof according to the third embodiment. As shown in the figure, in the present embodiment, a branch pipe (hereinafter referred to as a post-treatment fluid discharge pipe 69) for discharging the post-treatment fluid 38 to a middle position of the post-treatment fluid introduction pipe 53 through which the post-treatment fluid 38 flows. ) Is provided. A second valve 67 is attached in the middle of the treated fluid discharge pipe 69. The second valve 67 is normally in a closed state (C). The first valve 61, the first pressure gauge 58, and the second pressure gauge 59 are the same as in the second embodiment.

FIG. 12 is a flowchart illustrating a method for removing the deposit 65 according to this embodiment. As shown in the figure, the maintenance staff of the gasification system 10 starts the gasification system 10 (S20: YES), and at a predetermined or arbitrary timing, the first pressure of the first pressure gauge 58, The second pressure of the second pressure gauge 59 is measured (S21). If the measured first pressure is not higher than ΔP by more than ΔP (S22: NO), the first pressure of the first pressure gauge 58 and the second pressure of the second pressure gauge 59 are measured. The operation (S21) is repeated. When the measured first pressure is higher than the second pressure by ΔP or more (S22: YES), the first valve 61 is opened and the second valve 67 is also opened (S22: YES). S23).

When the first valve 61 is opened, the slurry body 37 flowing through the slurry body delivery pipe 52 is also discharged together with the deposit 65 attached to the inner wall of the curved portion 64 of the slurry body delivery pipe 52. Then, the pressure of the inner pipe 35 communicating with the slurry body delivery pipe 52 is lowered. As a result, the inner tube 35 may be damaged due to the pressure of the fluid 38 after the processing of the outer tube 36.

However, in this embodiment, the second valve 67 of the processed fluid 38 is also open. When the second valve 67 is opened, the treated fluid 38 in the treated fluid introduction pipe 53 is discharged from the treated fluid discharge pipe 69. Along with this, the pressure of the nearby outer pipe 36 communicating with the post-treatment fluid introduction pipe 53 also decreases. Thereby, the pressure difference between the inner tube 35 and the outer tube 36 in the double tube 34 is reduced, and damage to the heat exchanger 31 can be prevented.

After opening the first valve 61 and the second valve 67, the system waits for a predetermined time (S27), and then closes the first valve and the second valve again (S24). Then, the first pressure and the second pressure are again measured by the first pressure gauge 58 and the second pressure gauge 59 (S25). When the measured first pressure is higher than the second pressure by ΔP or more (S26: YES), the operation of opening the first valve 61 and the second valve 67 (S23) is repeated. On the other hand, when the first pressure is not higher than ΔP by more than ΔP (S26: NO), the first pressure of the first pressure gauge 58 and the second pressure of the second pressure gauge 59 are measured (S21). repeat.

In this way, the valve (first valve 61) provided in the vicinity of the adhesion range of the deposit 65 is opened to discharge the deposit 65 from the inner pipe 35, and the second valve 67 is opened to open the high temperature fluid ( By discharging the treated fluid 38) from the outer tube 36, the pressure difference between the inner tube 35 and the outer tube 36 can be reduced, and the heat exchanger 31 can be prevented from being damaged.

<Fourth embodiment>
FIG. 13 is a diagram schematically showing the configuration of the heat exchanger 31 according to the fourth embodiment. As shown in the figure, in this embodiment, the slurry body delivery pipe 52 is provided with a first valve 61, a first pressure gauge 58, and a second pressure gauge 59, and the post-treatment fluid introduction pipe 53 is provided with a first valve 61. A two-valve 67 and a third pressure gauge 68 are provided.

FIG. 14 is a flowchart illustrating a method for removing the deposit 65 according to this embodiment. As shown in the figure, the maintenance staff and the like start the gasification system 10 (S30: YES), and at a predetermined or arbitrary timing, the first pressure of the first pressure gauge 58 and the second pressure gauge 59 The second pressure is measured (S31). When the measured first pressure is higher than the second pressure by ΔP or more (S32: YES), the first valve 61 is opened (S33). Thereby, the deposit 65 adhering to the inner wall of the curved portion 64 of the slurry body delivery pipe 52 is discharged to the outside.

After opening the first valve 61 (S33), the first pressure gauge 58 and the third pressure gauge 68 measure the first pressure and the third pressure (denoted as P3 in the drawing), respectively (S35). When the measured third pressure is higher than the first pressure by a predetermined value α (S36: YES), the second valve 67 is opened (S37), while the third pressure is higher than the first pressure. If it is not higher than α (S36: NO), the process returns to S35.

The second valve 67 is opened (S37), and after waiting for a while, the first pressure and the third pressure are measured again (S38, S39). If the measured third pressure is higher than the first pressure by α or more (S40: YES), the process returns to S38, while the third pressure is not higher than the first pressure by α or more. (S40: NO), the second valve 67 is closed (S41), and the process proceeds to S43 described later.

The above-mentioned constant α is, for example, the upper limit value of the pressure difference between the inner pipe 35 and the outer pipe 36 that does not damage the double pipe 34 or a value slightly lower than that, and is determined empirically.

In S43, the first pressure and the second pressure are measured. If the measured first pressure is higher than the second pressure by ΔP or more (S44: YES), the operation of measuring the first pressure and the third pressure is repeated (S35). On the other hand, when the first pressure is not higher than ΔP by more than ΔP (S44: NO), the first valve 61 is closed (S46), the first pressure of the first pressure gauge 58, and the second pressure gauge 59. The operation (S31) of measuring the second pressure is repeated.

As described above, when the pressure difference between the fluid in the inner pipe 35 (slurry body 37) and the high-temperature fluid in the outer pipe 36 (processed fluid 38) is greater than or equal to a predetermined value, the first valve 61 and the second valve 67 Is opened, and the pressure difference between the fluid in the inner pipe 35 (slurry body 37) and the high-temperature fluid in the outer pipe 36 is prevented from being damaged, and the heat exchanger 31 is prevented from being damaged. The burden is also reduced.

<Fifth Embodiment>
In the second to fourth embodiments, ΔP, which is a differential pressure between the first pressure and the second pressure, is used as a parameter for determining the timing for opening the first valve 61. This ΔP can be determined empirically as described above. However, when it is difficult to determine ΔP empirically, ΔP can be theoretically obtained and used as follows. In the present embodiment, a method for obtaining this ΔP will be described based on the gasification system 10 of the second embodiment.

FIG. 15 is a diagram schematically showing the structure of the slurry body delivery pipe 52 and its periphery. As shown in the figure, first, the length L of the curved portion 64 of the slurry body delivery pipe 52 and its cross-sectional area A1 are measured. Further, the flow velocity u and the density ρ of the slurry body 37 flowing through the curved portion 64 are obtained. As a method for obtaining the flow velocity u, for example, there are a method of installing a flow meter on the downstream side of the curved portion 64, and a method of estimating from the volume of one stroke of the heat exchanger introduction pump 24, the operation time, and the like. Further, the density ρ is calculated from, for example, the volume of the slurry body 37 sent from the heat exchanger introduction pump 24 and its weight.

Next, assuming that the cross-sectional area A2 of the curved portion 64 when the deposit 65 needs to be discharged is 1/10 of the cross-sectional area A1 when the deposit 65 is not present, A2 is obtained (that is, A2). = A1 / 10). Based on these, ΔP is determined based on the following formulas (1) and (2) indicating the relationship between pressure loss and fluid.

ΔP = 4f × ((ρ (u ² )) / 2) × (L / d) (1)

f = 0.0791Re ⁽ -1/4 ⁾ (2)

Here, Re in Equation (2) is the Reynolds number, for example, 3000. By substituting L, u, and ρ obtained above into Equation (1), ΔP is obtained.

Apart from the above, ΔP can also be obtained based on the following equations (3) and (4) relating to fluid resistance.

ΔP = ((u ² ) / 2g) × (1-A2 / A1) ² = ζ ((u ² ) / 2g) (3)

ζ = (A2 / Ac-1) ² = (1 / Cc-1) ² (4)

Here, A2 / A1 = 0.1. Further, g is a gravitational acceleration, ζ is a loss coefficient, and Cc = Ac / A2 is a contraction coefficient. As shown in FIG. 16, Ac is a minimum cross-sectional area at a portion where the clogging portion 64 of the slurry body delivery pipe 52 starts to be blocked by the deposit 65. Further, the relationship between Cc and ζ is shown in the table showing the relationship between A2 / A1, Cc, and ζ shown in FIG. 17, and the relationship diagram between ζ, Cc, and A2 / A1 (FIG. 18). It can be obtained using.

In the above description, A2 / A1 = 0.1. However, A2 / A1 may be set to a predetermined value less than 1.

Thus, by calculating theoretically the predetermined value ΔP of the pressure loss based on the physical property value of the fluid that changes with temperature and pressure, the first valve 61 is closed before the curved portion 64 of the slurry body delivery pipe 52 is closed. Can be opened at the appropriate time. Note that the method for obtaining the differential pressure for determining the timing for opening the valve in this way can be applied not only to the first valve 61 but also to the second valve 67.

<Sixth Embodiment>
In the above embodiment, the method mainly relates to the method for discharging the deposit 65 in the pipe outside the heat exchanger 31, but the deposit in the pipe inside the heat exchanger 31 (for example, the double pipe 34). 65 can be discharged in the same manner.

FIG. 19 is a diagram illustrating the configuration of the inner tube 35 and the outer tube 36 related to the double tube 34 of the heat exchanger 31 shown as an example. A part of the double pipe 34 (for example, a longitudinal end portion in each of the rectangular spiral layers of the double pipe 34) is divided into two

double pipes

34a and 34b as shown in FIG. Of these, the inner pipe 35a of the double pipe 34a and the inner pipe 35b of the double pipe 34b are connected by an elbow pipe 76 (curved pipe) via a branch member 75a. Further, the outer pipe 36a of the double pipe 34a and the outer pipe 36b of the double pipe 34b are connected by a straight pipe 77 via a branch member 75b.

The branch member 75a branches the inner pipe 35a of the double pipe 34a into an elbow pipe 76 and the outer pipe 36a into a straight pipe 77. The branch member 75 b branches the inner pipe 35 b of the double pipe 34 b to the elbow pipe 76 and the outer pipe 36 b to the straight pipe 77. As a result, the slurry body 37 that has flowed from the upstream through the inner pipe 35a is sent to the inner pipe 35b through the elbow pipe 76, while the treated fluid 38 that has flowed from the upstream through the outer pipe 36b is the straight pipe 77. And is delivered to the outer tube 36a.

Here, a fourth pressure gauge 78 is provided on the upstream side of the bent portion of the elbow pipe 76, and a fifth pressure gauge 79 is provided on the downstream side of the bent portion of the elbow pipe 76. Further, a deposit discharge pipe 84 that is a branch pipe of the elbow pipe 76 is provided on the downstream side of the fifth pressure gauge 79. A third valve 81 is provided in the middle of the deposit discharge pipe 84. The third valve 81 is normally in a closed state (C).

On the other hand, a sixth pressure gauge 85 is provided in the double pipe 34b on the upstream side of the straight pipe 77. A seventh pressure gauge 86 is provided in the middle of the straight pipe 77. A post-treatment fluid discharge pipe 87 that is a branch pipe of the straight pipe 77 is provided on the downstream side of the seventh pressure gauge 86. A fourth valve 83 is provided in the middle of the treated fluid discharge pipe 87. The fourth valve 83 is normally in a closed state (C).

In the above-described piping configuration, the deposit 65 such as tar and char derived from the slurry body 37 easily adheres to the inner wall of the elbow pipe 76 in addition to the inner pipe 35 and the outer pipe 36 of the double pipe 34. .

Therefore, the pressure of the slurry body 37 is measured with the fourth pressure gauge 78 on the upstream side and the fifth pressure gauge 79 on the downstream side, and the pressure on the upstream side (fourth pressure) is the pressure on the downstream side (fifth pressure). In the case where it is higher than ΔP, the deposit 65 is discharged to the outside by opening the third valve 81.

Further, the pressure of the processed fluid 38 is measured by the upstream sixth pressure gauge 85 and the downstream seventh pressure gauge 86, and the upstream pressure (sixth pressure) is the downstream pressure (seventh pressure). Is higher than the predetermined value β, the post-processing fluid 38 is discharged by opening the fourth valve 83.

In this way, the valve (third valve 81) attached to the adhesion range (elbow pipe 76) of the deposit 65 is opened, and the valve (fourth valve 83) attached to the outer pipe 36b is opened to increase the temperature. By discharging the fluid (processed fluid 38) to the outside, the pressure difference between the inner tube 35 and the outer tube 36 can be reduced, and damage to the heat exchanger 31 can be prevented.

Further, when the difference between the upstream pressure and the downstream pressure of the high-temperature fluid (processed fluid 38) is a predetermined value or more, each of the valves (the third valve 81 and the fourth valve 83) is opened. The pressure difference between the fluid in the inner pipe 35 (slurry body 37) and the high-temperature fluid (processed fluid 38) is prevented from damaging the heat exchanger 31, and the maintenance management burden for maintenance personnel and the like is reduced. Is done.

<Seventh embodiment>
In the first to fifth embodiments, a pressure gauge is arranged on the downstream side of the heat exchanger 31, and in the sixth embodiment, a pressure gauge is arranged inside the heat exchanger 31, but the heat exchanger 31 is A pressure gauge may be disposed on each of the upstream side and the downstream side so as to be sandwiched.

FIG. 20 is a diagram showing a detailed configuration of the heat exchanger 31 according to the present embodiment. As shown in the figure, the first pressure gauge 58 is provided at the lower end outside the heat exchanger 31, and the second pressure gauge 59 is provided at the upper end outside the heat exchanger 31. Specifically, the first pressure gauge 58 is provided in the slurry body introduction pipe 51 of the heat exchanger 31, and the second pressure gauge 59 is provided in the slurry body delivery pipe 52.

In such a pressure gauge arrangement, the pressure of the first pressure gauge 58 (first pressure) and the pressure of the second pressure gauge 59 (second pressure) are measured, and the first pressure is more predetermined than the second pressure. When it is higher than the allowable value, the first valve 61 is opened. In this way, it is possible to prevent the deposit 65 from adhering to the double pipe 34 and blocking the double pipe 34 for a wide range of the entire double pipe 34 of the heat exchanger 31.

In this case, the deposit 65 can be discharged also by causing the slurry body 37 of the heat exchanger 31 to flow backward.

<Eighth Embodiment>
In the embodiments described above, the description has been made on the assumption that pressure measurement, confirmation, and valve opening / closing are performed by maintenance personnel or the like. However, it should be automated using an information processing device (computer). May be.

FIG. 21 is a diagram for explaining the gasification system 10 configured to automatically perform pressure measurement and valve opening / closing, as an example. As shown in the figure, the gasification system 10 includes a first pressure gauge 58, a second pressure gauge 59, a third pressure gauge 68, a first valve 61, and a second valve 67, as in the fourth embodiment. Is provided. This piping blockage prevention system is connected to each of the first pressure gauge 58, the second pressure gauge 59, the third pressure gauge 68, the first valve 61, and the second valve 67 via the communication network 91. A processing device 92 is provided. The information processing device 92 can receive the current pressure measurement value output from the first pressure gauge 58, the second pressure gauge 59, and the third pressure gauge 68. Further, the information processing device 92 transmits a valve opening / closing instruction signal to each of the first valve 61 and the second valve 67, and the first valve 61 and the second valve 67 receive these instruction signals. Thus, opening / closing control of the valve can be performed.

For example, the information processing device 92 receives the current pressure value from the first pressure gauge 58 and the second pressure gauge 59, and when the received first pressure is higher than the second pressure by ΔP or more, A valve opening instruction signal is transmitted to the valve 61. The first valve 61 that has received this instruction signal opens the first valve 61. The information processing device 92 receives the pressure values of the first pressure and the third pressure, and if the received third pressure value is higher than the first pressure value by α or more, the second information processing device 92 receives the second pressure value. An opening instruction signal is transmitted to the valve 67. The second valve 67 that has received this instruction signal opens the second valve 67.

Thus, by using the gasification system 10 that automatically obtains the pressure value and opens and closes the valve using a computer or a network, the work load of maintenance personnel and the like can be reduced.

The above description of the embodiment is intended to facilitate understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

For example, in the description of the above-described embodiment, it is assumed that the attached matter mainly adheres to the curved portion of the pipe, but the attached matter adheres even in the straight pipe portion. Therefore, it is not always necessary to provide a pressure gauge or a valve at the curved portion of the pipe or in the vicinity thereof.

In the above embodiment, the pipe closing method has been described on the premise of the pipe in the biomass gasification system. However, the present invention is applicable to pipes in which deposits adhere to the pipe.

Further, in the description of the above embodiment, the positional relationship between the pressure gauge and the valve is mainly the pressure on the upstream side of the region so as to sandwich the area 95 to which the deposit adheres, as shown in FIG. The pressure gauge 97 is provided on the downstream side, and the valve 98 is further provided on the downstream side of the pressure gauge 97. However, the pressure gauge 96 on the upstream side, the pressure gauge 97 on the downstream side, and the valve 98 are provided. The positional relationship between is not limited to this.

For example, as shown in FIG. 22B, a valve 98 may be provided between the upstream pressure gauge 96 and the downstream pressure gauge 97, or as shown in FIG. A valve 98 may be provided further upstream than the total 96. Regardless of the positional relationship, it is considered that there is no significant difference in the effect of discharging the deposit.

10 gasification system, 20 raw material preparation section, 21 preparation tank, 22 pulverizer, 23 supply pump, 24 heat exchanger introduction pump, 30 heat treatment section, 31 heat exchanger, 32 heater, 32a combustion device, 33 gasification reaction , 33a combustion device, 34 double pipe, 35 inner pipe, 36 outer pipe, 37 slurry body, 38 post-treatment fluid, 40 gas treatment section, 41 decompression mechanism, 42 gas-liquid separator, 43 catalyst recovery unit, 44 gas tank , 51 slurry body introduction pipe, 52 slurry body delivery pipe, 53 post-treatment fluid introduction pipe, 54 post-treatment fluid delivery pipe, 55 branch member, 56 branch member, 58 first pressure gauge, 59 second pressure gauge, 61 first Valve, 62 connecting member, 63 connecting member, 64 curved portion, 64a back side inner wall surface, 64b ventral side inner wall surface, 65 deposit, 66 Kimono discharge pipe, 67 second valve, 68 third pressure gauge, 69 post-treatment fluid discharge pipe, 75 branch member, 76 elbow pipe, 76a elbow pipe one end, 76b other elbow pipe end, 77 straight pipe, 77a straight pipe , 77b, the other end of the straight pipe, 78 fourth pressure gauge, 79 fifth pressure gauge, 81 third valve, 82 sixth pressure gauge, 83 fourth valve, 84 deposit discharge pipe, 85 sixth pressure gauge, 86 7th pressure gauge, 87 after-treatment fluid discharge pipe, 91 communication network, 92 information processing device, 95 range where deposits adhere, 96 pressure gauge, 97 pressure gauge, 98 valve

Claims

In a pipe in which a viscous body or solidified substance derived from a fluid flowing in a pressurized state adheres as a deposit to a predetermined range in the flow direction on the inner wall surface,
When the first pressure, which is the pressure upstream of the predetermined range, is greater than or equal to a predetermined allowable value, the attached matter is discharged from the pipe by opening a valve attached in the vicinity of the predetermined range. A method for preventing pipe clogging.
2. The pipe blockage prevention method according to claim 1, wherein the valve is opened and the valve is closed after a predetermined time has elapsed.
3. The pipe blockage prevention method according to claim 2, wherein after the valve is opened, the valve is closed when the first pressure becomes lower than a predetermined value.
In a pipe in which a viscous body or solidified substance derived from a fluid flowing in a pressurized state adheres as a deposit to a predetermined range in the flow direction on the inner wall surface,
When the first pressure, which is the pressure upstream of the predetermined range, is higher than the second pressure, which is the pressure downstream of the predetermined range, it is attached in the vicinity of the predetermined range. A pipe blockage prevention method, wherein the deposit is discharged from the pipe by opening a valve.
A pressure loss of the fluid generated in the predetermined range is calculated based on a physical property value of the fluid;
5. The valve according to claim 4, wherein the valve is opened when the first pressure is higher than the second pressure by more than the allowable value set based on the calculated pressure loss. 6. Piping blockage prevention method.
The pipe blockage prevention method according to claim 5, wherein the pressure loss of the fluid generated in the predetermined range is calculated based on the flow velocity and density of the fluid.
Calculating the fluid resistance of the fluid flowing through the predetermined range based on the flow velocity of the fluid;
5. The valve according to claim 4, wherein the valve is opened when the first pressure is higher than the second pressure by more than the allowable value set based on the calculated fluid resistance. Piping blockage prevention method.
A heat exchanger comprising as an inner pipe the pipe through which a biomass slurry body flows as the fluid, and a pipe through which a high-temperature fluid heat exchanged with the slurry body as an outer pipe;
Gasification reaction in which the slurry body sent from the heat exchanger is heated to gasify the slurry body and the slurry body after the gasification is sent to the outer pipe as the high-temperature fluid A gasification system comprising a vessel,
When the first pressure is higher than the second allowable pressure by the predetermined allowable value or more, the attached matter is discharged from the inner pipe by opening the valve attached in the vicinity of the predetermined range. The pipe blockage prevention method according to any one of claims 4 to 7, wherein:
When the first pressure is higher than the second allowable value by more than the predetermined allowable value, the deposit is discharged from the inner pipe by opening the valve attached in the vicinity of the predetermined range. The pipe blockage prevention method according to claim 8, wherein the high-temperature fluid flowing through the outer pipe is discharged to the outside.
When the first pressure is higher than the second allowable value by more than the predetermined allowable value, if the pressure difference of the high temperature fluid in the outer pipe near the predetermined range is higher than the predetermined value, The said attached substance is discharged | emitted from the said inner pipe by open | releasing the valve provided in the vicinity of the predetermined range, and the said high temperature fluid which flows through the said outer pipe | tube is discharged | emitted outside. The piping blockage prevention method described.
The pipe blockage prevention method according to any one of claims 1 to 10, wherein the predetermined range is a curved portion of a pipe through which the fluid flows.
In a predetermined range in the flow direction on the inner wall surface, an inner tube in which a viscous body or a solidified material derived from a biomass slurry flowing under pressure adheres as an adhering material, and a high-temperature fluid that exchanges heat with the slurry flow. A heat exchanger comprising an outer pipe which is a pipe;
Gasification reaction in which the slurry body sent from the heat exchanger is heated to gasify the slurry body and the slurry body after the gasification is sent to the outer pipe as the high-temperature fluid A pipe blockage prevention system in a gasification system comprising a vessel,
The first pressure, which is the pressure upstream of the predetermined range, is provided near the predetermined range when the second pressure, which is the pressure downstream of the predetermined range, is higher than a predetermined allowable value. A pipe blockage prevention system comprising: an information processing device having a function of discharging the high-temperature fluid flowing through the outer pipe to the outside while discharging the deposit from the inner pipe by opening the valve. .