JP2005295852A - Heating source apparatus for sterilization of soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating source apparatus for sterilization of soil capable of easily bringing into a spot to be sterilized, quickly switching steam sterilization, hot water sterilization or combined use for the both according to the soil, crop plants, or kinds of pathogenic bacteria, and the like, in the soil. <P>SOLUTION: This invention relates to the heating apparatus for sterilization of soil provided with a steam boiler (10) and a hot water generator (20) mounted on a carrier (2) which has wheels (3), wherein the steam boiler (10) generates steam having temperature required for sterilization of the soil and has a steam feeding path for sterilization (15) feeding the steam to a steam sterilizing hose (18) and a heating steam feeding path (16) for feeding the steam to the hot water generator (20) which comprises a heat-exchanging tank (21) mixing the steam fed from the heating steam feeding path (16) and water fed from outside for rising the water to the required temperature for sterilization and a sterilizing hot water feeding path (28) feeding the sterilizing hot water generated in the heat-exchanging tank (21) to a hot water sterilizing hose (31). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a heat source device for soil disinfection used for killing pathogenic bacteria by heating soil with steam or hot water, that is, steam disinfection or hot water disinfection. Alternatively, the present invention relates to a heat source device for soil disinfection that enables rapid switching between steam disinfection and hot water disinfection or a combination of both depending on the type of crop, the type of pathogenic bacteria in the soil, and the like.

In general, as a means of performing so-called soil disinfection that kills pathogenic bacteria in the soil, chemical disinfection by injecting drugs such as methyl bromide into the soil, hot water disinfection by heating the soil with hot water, and heating the soil with steam There are steam disinfection. In recent years, hot water disinfection and steam disinfection have been in the limelight because the above-mentioned chemical disinfection may adversely affect the environment such as pollution.

By the way, conventionally, a hot water boiler that generates hot water is used for hot water disinfection, and a steam boiler that generates steam is used for steam disinfection, which increases equipment costs and is troublesome for maintenance and management. Was necessary. Also, there are some that produce hot water with steam from a steam boiler that can be used for steam disinfection, warm the cultivation house with this hot water, and produce hot water for irrigation. It was something that could not be done. Moreover, since the steam boiler and the hot water production device for producing hot water with the steam of the steam boiler are not mounted on one carriage, it is difficult to carry into the soil disinfection site to be sterilized, and the soil Alternatively, when disinfection means differ depending on the type of crop, the type of pathogenic bacteria in the soil, etc., switching between steam disinfection and hot water disinfection, or a combination of these cannot be performed quickly.
JP 2001-157520 A

The present invention makes it easy to carry into a soil disinfection site, and enables rapid switching between steam disinfection and hot water disinfection, or a combination thereof, depending on the type of soil or crop, the type of pathogenic bacteria in the soil, etc. It aims at obtaining the heat-source apparatus for soil disinfection made into.

In order to achieve the above object, the present invention is configured as follows. That is, the invention according to claim 1 mounts a steam boiler and a hot water generator on a carriage having wheels, and the steam boiler generates steam at a temperature required for disinfecting the soil, and the steam is A disinfection steam supply path for supplying to the steam disinfection hose; and a heating steam supply path for supplying the steam to the hot water generator, wherein the hot water generator is supplied from the heating steam supply path. A heat exchange tank that mixes steam and water supplied from outside to raise the temperature required for disinfection, and hot water supply for disinfection that supplies the hot water generated in the heat exchange tank to the hot water disinfection hose And a road.
According to a second aspect of the present invention, the steam boiler generates steam at 100 ° C to 140 ° C, and the hot water generator generates hot water at 80 ° C to 95 ° C.
According to a third aspect of the present invention, the heat exchange tank of the hot water generator includes a parent pipe connected to the heating steam supply path in the tank body, and a predetermined interval in the horizontal direction between the parent pipe. A branch pipe connected in parallel and having a large number of steam jet holes on the outer periphery; and a cylindrical convection pipe having an open upper and lower end fitted with a predetermined gap on the outer periphery of each branch pipe; It is the structure which accommodates.

The invention according to the present invention can be quickly moved to a soil disinfection site to be disinfected in a state where the steam boiler and the hot water generator are unitized by operating the carriage. And, by connecting the steam disinfection hose to the steam supply path for disinfection of the steam boiler, the soil can be disinfected with steam, and the hot water disinfection hose is connected to the disinfection hot water supply path of the hot water generator. Therefore, it is possible to quickly switch between steam disinfection and hot water disinfection or a combination thereof depending on the type of soil or crop, the type of pathogenic bacteria in the soil, and the like.
Further, when the steam of the steam boiler is supplied to the parent pipe of the heat exchange tank via the heating steam supply path, the steam flows into each branch pipe via the parent pipe, and each steam ejection hole of each branch pipe From the convection pipe and the branch pipe, and is mixed with water existing in the gap to be liquefied and the water is heated (heated). Since the heated hot water has a lower specific gravity than other water, it moves upward in the gap between the convection pipe and the branch pipe and flows out from the upper end opening of the convection pipe to the upper part of the tank body. Accordingly, the water in the lower part of the tank main body flows into the gap between the convection pipe and the branch pipe from the lower end opening of the convection pipe. This action is repeated, and the water in the tank body is efficiently heated.

Hereinafter, the present invention will be described with reference to the drawings. In the figure, FIG. 1 is a schematic diagram showing the entire heat source apparatus for soil disinfection according to the present invention, FIG. 2 is a side view of a steam boiler section according to the present invention, and FIG. 3 is a sectional view of a hot water generating apparatus section according to the present invention. 4 is a main part sectional view showing the steam disinfection state of the soil, FIG. 5 is a main part sectional view showing the hot water disinfection state of the soil, and FIG. 6 is a main part sectional view showing the hot water disinfection state of the soil according to another example. is there.

1 and 2, reference numeral 1 denotes a heat source device for soil disinfection, in which a steam boiler 10 is placed at the rear part (left part in FIG. 2), and a hot water generator 20 is placed at the front part of the carriage 2. And the hot water apparatus 20 introduce | transduces the steam of the steam boiler 10, and produces | generates hot water.

The steam boiler 10 is provided with a burner 12 for burning kerosene, heavy oil or the like at the rear part of the steam tank 11, supplying water such as tap water or well water to the steam tank 11 through a water supply pipe 13, and supplying the supplied water The combustion heat of the burner 12 is used to generate steam at 100 ° C. to 140 ° C., preferably 120 ° C. to 130 ° C. The steam generated by the steam boiler 10 is discharged to the outside through the discharge pipe 14. V1 is a manually operated main valve that opens and closes the discharge pipe 14.

The discharge pipe 14 includes a disinfecting steam supply path (hose) 15 opened and closed by a manual first operation valve V2, and a heating steam supply path (hose) opened and closed by a manual second operation valve V3. 16 are connected in parallel, and a number of steam disinfection hoses 18 are connected to the disinfecting steam supply passage 15 through distribution pipes 17. The heating steam supply path 16 is connected to the heat exchange tank 21 of the hot water generator 20 via the temperature control valve V4.

The heat exchange tank 21 is as shown in FIG. That is, a main pipe 23 connected to the heating steam supply path 16 is horizontally installed on the upper portion of the tank body 22 having an upper lid, and a large number of branch pipes 24 in which steam jet holes 24 a are formed in the main pipe 23. Are drooped in the longitudinal direction (horizontal direction) at substantially equal intervals. In this example, the tank main body 22 is a rectangular parallelepiped having a left-right width of about 600 mm, a depth (front-rear width) of about 200 mm, and a height of about 450 mm in FIG. 3, and the main tube 23 has a length of 550 mm with both ends closed. The branch pipe 24 is formed of a round pipe having a length of 300 mm and a diameter of 27.2 mm with a closed lower end, and a steam jet hole 24a having a diameter of 5.5 mm in the lower half thereof. Are formed in four places in the circumferential direction and eight places at a pitch of about 20 mm vertically.

A convection tube 25 is coaxially fitted to the outer periphery of each branch tube 24. The convection pipe 25 is formed of a cylindrical pipe having a length of 320 mm and a diameter of 60.5 mm and having an open top and bottom, and holds a gap (a) between the convection pipe 25 and the branch pipe 24. In addition, the dimension of each above-mentioned member is suitably set by the capacity | capacitance of the steam boiler 10, the quantity and length of the steam disinfection hose 18, the quantity and length of the hot water disinfection hose 31 mentioned later, etc. Further, the parent pipe 23 is formed by joining pipe members whose ends are closed in a cross shape in plan view, and branch pipes 24 similar to those described above are suspendedly connected to the three pipe materials, and the outer periphery of each branch pipe 24 A convection tube 25 similar to that described above may be fitted coaxially.

An inlet pipe 26 for introducing tap water, well water or the like is connected to the upper part of the tank body 22, and a discharge pipe 27 for discharging hot water in the tank body 22 to the outside via the pump P1 to the lower part of the tank body 22. And a disinfection hot water supply path (hose) 28 and a return pipe 29 are connected to the discharge pipe 27 via a three-way valve V5. As shown in FIG. 1, a large number of hot water disinfection hoses 31 are connected to the disinfecting hot water supply passage (hose) 28 through distribution pipes 30.

A first sensor S1 for outputting the hot water temperature in the tank main body 22 to a control unit (not shown) is mounted in the tank main body 22, and a second temperature for outputting the hot water temperature to the control unit in the discharge pipe 27. Mount sensor S2. The control unit inputs the signal of the first sensor S1 and opens and closes the temperature control valve V4 described above, thereby adjusting the amount of steam supplied from the steam boiler 10 to the hot water generator 20 and the tank body 22. The hot water generator is controlled by controlling the internal hot water to be 80 ° C. to 95 ° C., preferably 90 ° C. to 95 ° C., and switching the above-described three-way valve V5 by inputting the signal of the second sensor S2. The temperature of hot water supplied from 20 to the hot water disinfection hose 31 is set to 90 ° C. or higher.

Next, the usage mode of the above embodiment will be described. First, when steam disinfecting soil, it is performed as follows. That is, as shown in FIG. 4, the steam disinfection hose 18 in which a large number of ejection holes are formed is placed on the surface of the soil 40 targeted for disinfection. Next, the surface 40a of the soil 40 is covered with a non-breathable sheet 41 made of a polyethylene sheet or a vinyl sheet, a weight 42 is placed on the periphery of the sheet 41 and sealed, and the upper surface of the sheet 41 is covered with a lightweight heat-insulating sheet. 43.

Next, as shown in FIG. 1, the steam disinfection hose 18 is connected to the disinfection steam supply path (hose) 15 of the steam boiler 10 via the distribution pipe 17, and the second operation valve V3 is closed and the original valve V1 is closed. And the first operating valve V2 is opened. In this case, the steam generated by the steam boiler 10 is supplied to the steam disinfection hose 18 via the discharge pipe 14, the disinfection steam supply path 15, and the distribution pipe 17, and the steam at about 110 ° C. is supplied from the steam disinfection hose 18. Erupts. This state is continued for 90 minutes to 110 minutes, for example, and the soil 40 is heated so that the temperature of the soil 40 reaches, for example, about 20 cm and reaches the killing temperature (60 ° C. or higher) of the crop pathogen.

Next, when hydrothermal disinfecting the soil, it is performed as follows. That is, as shown in FIG. 5, the hot water disinfection hose 31 in which a large number of ejection holes are formed is placed at a predetermined pitch on the surface 40a of the soil 40 targeted for disinfection. Next, the surface 41 a of the soil 40 is covered with the hot water disinfection hose 31 by the sheet 41, and the upper surface of the sheet 41 is covered by a lightweight heat retaining sheet 43.

Next, as shown in FIG. 1, the hot water disinfection hose 31 is connected to the disinfecting hot water supply path (hose) 28 of the hot water generator 20 through the distribution pipe 30, and the first operation valve V <b> 2 is closed. The main valve V1 and the second operation valve V3 are opened. Then, the steam generated by the steam boiler 10 is supplied to the hot water generator 20 via the discharge pipe 14 and the heating steam supply path 16. As shown in FIG. 3, the steam supplied to the hot water generator 20 flows into each branch pipe 24 from the main pipe 23, and the convection pipe 25 and the branch pipe 24 are connected to the branch pipe 24 through the steam ejection holes 24 a. The water is ejected into the gap portion (a), mixed with the water present in the gap portion (a) and liquefied, and the water is heated (heated).

Since the heated hot water has a lower specific gravity than other water, the hot water moves upward in the gap (a) between the convection pipe 25 and the branch pipe 24, and reaches the tank from the upper end opening of the convection pipe 25. It flows out to the upper part in the main body 22, and the water of the lower part in the tank main body 22 flows into the said gap | interval part (a) in connection with this. This action is repeated, and the water in the tank body 22 is heated in an efficient and quiet state. And the hot water of 90 to 95 degreeC set by the action | operation of the 1st sensor S1 and the temperature control valve V4 is produced | generated.

The heated hot water is supplied to the hot water disinfection hose 31 through the disinfection hot water supply path 28 and the distribution pipe 30 by the pump P1, and from each of the hot water disinfection hoses 31 as shown in FIG. Hot water 46 is ejected. The discharge time of the hot water 46 by the hot water disinfection hose 31 is maintained, for example, for 90 minutes to 110 minutes, so that the temperature of the soil 40 reaches a depth of about 20 cm and reaches the killing temperature of the crop pathogen (about 60 ° C. or more). Heat.

In addition, when hydrothermal disinfecting soil, you may make it cover the surface 40a of the soil 40 made into disinfection as shown in FIG. That is, after the hot water disinfection hose 31 having a large number of ejection holes formed in the upper half portion is placed on the surface 40a of the soil 40, the surface 40a is covered with the sheet 41, and the weight 42 is placed on the peripheral portion of the sheet 41. The sheet 41 is placed and sealed, and the upper surface of the sheet 41 is covered with a lightweight heat retaining sheet 43. Next, air (outside air) is pumped into the sheet 41 by a blower (not shown), and the sheet 41 is expanded in an arc shape so that the hot water 46 ejected from the hot water disinfection hose 31 does not contact the sheet 41. The

Next, hot water 46 is ejected from the hot water disinfection hose 31. If it does in this way, the hot water 46 ejected from the hot water disinfection hose 31 will be ejected radially, and it will be spread | dispersed substantially uniformly over the wide soil surface 40a, and the hot water disinfection hose 31 installed in a soil area of The number is reduced, and the installation work and the removal work after the soil disinfection can be performed quickly and with a small effort.

In addition, when the soil 40 is heated and disinfected more deeply, for example, to a depth of 30 cm to 40 cm, for example, the following is performed. That is, the steam disinfection hose 18 and the hot water disinfection hose 31 are placed in parallel on the surface 41a of the soil 41 covered with the sheet 41. First, the second operation valve V3 is closed, the main valve V1, and the first operation The valve V2 is opened, steam is supplied to the steam disinfection hose 18 from the disinfection steam supply passage 15, and the temperature of the soil 40 reaches, for example, a depth of about 20 cm by the steam 45 ejected from the steam disinfection hose 18 to Heat to kill temperature.

Next, the first operation valve V2 is closed, the main valve V1 and the second operation valve V3 are opened, and the steam of the steam boiler 10 is supplied from the heating steam supply path 16 to the hot water generator 20, and the hot water generator The hot water generated at 20 is supplied to the hot water disinfection hose 31 via the steam disinfection hot water supply path 28, and the hot water 46 is sprayed from the hot water disinfection hose 31 onto the surface 40 a of the soil 40. In this case, the hot water 46 does not drop so much until it penetrates into the soil 40 to a depth of about 20 cm, and mainly heats the soil reaching 30 to 40 cm deeper than the depth of about 20 cm. Thereby, the soil 40 can be heat-disinfected deeply efficiently.

It is the schematic which shows the whole heat source apparatus for soil disinfection by this invention. It is a side view of the steam boiler part by this invention. It is sectional drawing of the hot-water generator apparatus part by this invention. It is principal part sectional drawing which shows the steam disinfection state of soil. It is principal part sectional drawing which shows the hot water disinfection state of soil. It is principal part sectional drawing which shows the hot-water disinfection state of the soil by another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source apparatus for soil disinfection 2 Bogie 3 Wheel 4 Front leg 5 Handle 10 Steam boiler 11 Steam trough 12 Burner 13 Water supply pipe 14 Discharge pipe 15 Disinfection steam supply path 16 Heating steam supply path 17 Distribution pipe 18 Steam disinfection hose 20 Hot water Generator 21 Heat exchange tank 22 Tank body 23 Main pipe 24 Branch pipe 24a Ejection hole 25 Convection pipe 26 Introduction pipe 27 Discharge pipe 28 Disinfection hot water supply path 29 Return pipe 30 Divided pipe 31 Hot water disinfection hose 40 Soil 40a Soil surface 41 Seat 42 Weight 43 Thermal insulation sheet 45 Steam 46 Hot water P1 Pump V1 Main valve V2 First operation valve V3 Second operation valve V4 Temperature control valve V5 Three-way valve S1 First sensor S2 Second sensor

Claims (3)

A bogie (2) having wheels (3) is equipped with a steam boiler (10) and a hot water generator (20), the steam boiler (10) generates steam at a temperature required for soil disinfection, A disinfection steam supply path (15) for supplying the steam to the soil steam disinfection hose (18), and a heating steam supply path (16) for supplying the steam to the hot water generator (20). The hot water generator (20) mixes the steam supplied from the heating steam supply passage (16) and the water supplied from the outside to increase the temperature to the temperature required for disinfection (21 And a disinfecting hot water supply passage (28) for supplying the hot water generated in the heat exchange tank (21) to the hot water disinfection hose (31) of the soil. Heat source device for disinfection. Soil disinfection according to claim 1, characterized in that the steam boiler (10) generates steam at 100 ° C to 140 ° C and the hot water generator (20) generates hot water at 80 ° C to 95 ° C. Heat source equipment. The heat exchange tank (21) of the hot water generator (20) includes a main pipe (23) connected to the heating steam supply path (16) and a main pipe (23) in the tank body (22). A branch pipe (24) having a plurality of steam ejection holes (24a) on the outer periphery and connected in parallel at a predetermined interval in the horizontal direction, and a predetermined gap (a) in the outer periphery of each branch pipe (24). A heat source device for soil disinfection according to claim 1 or 2, characterized in that a cylindrical convection tube (25) having upper and lower ends that are fitted and held is accommodated.

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