JP2005110646A - System for soil sterilization with steam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for sterilizing soil with steam that can perform the automatic operations for switching steam-feeding pipes to the others for sterilizing the soil to be disinfected and for stopping the boiler after the sterilization. <P>SOLUTION: The sterilization valves are opened or closed on the basis of the measurement signal from the soil temperature sensor. When the temperature of the soil on the sterilization step is raised up to a set value, the sterilization valves for the next soil to be sterilized are opened, while the advancing opened valves are closed. When the sterilization temperature of all soil lots is raised to a set one, the operation of the boiler is automatically stopped. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

      The present invention relates to a steam soil disinfecting system for sterilizing and disinfecting with heat of steam.

  Conventionally, the steam generated in the boiler is sprayed onto the target soil from a steam hose or pipe connected to a steam supply pipe to disinfect the soil. To move to the next disinfection target after disinfection, the boiler is temporarily stopped or the disinfection is performed again by connecting the steam disinfection tube to the next steam hose or pipe. Moreover, when all the disinfection was completed, the operation of the boiler was stopped.

Problems to be solved by the invention

  In particular, agricultural steam soil disinfection may take more than half a day to disinfect each site because the area of the target soil is large. In addition, confirmation of the completion of disinfection was only possible by measuring the temperature in the soil, and when there was a farm away from home, confirmation alone was often troublesome. After the disinfection, the steam supply pipe, which may be burned due to residual heat, is replaced with a new steam hose at the next disinfection site. There was a case. The problem to be solved by the present invention is to eliminate the high-temperature work by human power and the work in the late-night time zone, and automatically move the disinfection place and stop the boiler after the end.

Means for solving the problem

[Solution 1]
Steam supply pipes for supplying steam to multiple sterilization targets are provided in the pipe supplying steam, and a valve that can be opened and closed remotely is provided for each branched pipe.
[Solution 2]
A temperature sensor and a controller capable of transmitting temperature data to a plurality of sterilization targets are provided, so that the valve can be automatically opened and closed when a predetermined temperature is reached.
[Solution 3]
First, the valve connected to the disinfection hose that supplies steam is opened, the other valves are closed, and then the next one or more valves are opened. At the same time, the previously opened valves are closed. After reaching, set the controller to automatically stop the boiler with all or specific valves open.
[Solution 4]
In case of an automatic open / close valve failure, when the steam pressure on the upstream side of the branch pipe exceeds the preset allowable pressure, the steam is urgently released to the outside and the boiler is automatically stopped.

Embodiments of the present invention will be described below with reference to the drawings. In the figure, FIG. 1 is a piping system diagram showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of disinfecting soil, and FIG. It is a flowchart of.
1 and 2, reference numeral 1 denotes a boiler, and a steam hose passes through a steam supply pipe 3, a steam branch pipe 4, and a disinfection valve 5 that automatically opens and closes by an external electric signal from a steam source valve 2. 6 is supplied. If the sterilization valve 5 malfunctions and the steam supply pressure in the steam supply pipe 3 becomes abnormally higher than the set pressure, the emergency discharge valve 13 automatically releases the steam.

  In this embodiment, agricultural soil is shown, and four ridges 10 are set on the soil (FIG. 2). In this way, steam branch pipes 4 are provided so that the steam can be branched into four paths, and a steam hose 6 is connected to each. Each temperature sensor (7a, 7b, 7c, 7d) is embedded in each cage (10a, 10b, 10c, 10d), and a signal is sent to the controller 9 via a cable 8a. The sanitizer 10 is sterilized by the thermal energy of the steam discharged from each disinfection hose (6a, 6b, 6c, 6d). Since the steam is lighter than air, the upper surface of the casket 10 is covered with the sheet 11 and 10 is pressed by each weight (12a, 12b, 12c, 12d, 12, e), and the steam is contained inside the sheet 11.

  The flowchart of FIG. 3 shows a method of automatically disinfecting the four baskets 10 sequentially. First, the operation of the boiler 1 is started (step S1). When the steam pressure is increased and the disinfection is completed (step S2), the disinfection valve 5a is opened, and the steam source valve 2 is manually opened to start disinfection (step S3). → S4 → S5). The reason why the disinfection valve 5a is opened first is to prevent the high steam pressure in the boiler 1 caused by opening the steam source valve 2 first from acting on the branch pipe 4. The steam hose 6 has innumerable pores, and the spout 10 is heated by spraying steam from the pores. The steam source valve 2 is manually opened to set the opening so that the steam pressure in the boiler becomes a predetermined pressure.

  The disinfection is started, and when the temperature measurement value of the temperature sensor 7a of the bag 10a reaches the set value, the bag disinfection is completed. At the same time, a signal from the temperature sensor 7a is transmitted through the cable 8a, and the disinfection valve 5b is opened from the controller 9 through the cable 8b. Next, the disinfection valve 5a is closed. The reason why the sterilization valve 5a is not closed first is to prevent the pressure in the steam supply pipe 3 and the steam branch pipe 4 from rising rapidly by temporarily closing all the sterilization valves.

  Thereafter, when the temperature of each basket (10b, 10c, 10d) reaches a set value in the same manner, the sterilization valves (5b, 5c, 5d) are automatically opened and closed at one or a plurality of locations to continue sterilization. When the temperature of all the rods 10 reaches the set temperature once, a signal from the controller 9 is sent to the boiler 1 via the cable 8c, and the operation of the boiler 1 is automatically stopped. Since the sterilization valve 5d opened last remains open, the steam in the boiler is released.

  When the emergency discharge valve is activated, the temperature of the discharged steam is detected by the temperature sensor 7e installed at the steam outlet, and the boiler is automatically stopped.

The invention's effect

  As is clear from the above description, the present invention provides a disinfection valve that can be automatically opened and closed in a distribution pipe that supplies steam generated by a boiler to a plurality of soils to be disinfected after manual preparation for disinfection. A plurality of sterilization targets are measured with a temperature sensor, and when the sterilization target temperature reaches a preset temperature, the sterilization valve is opened and closed by the controller so that multiple targets can be continuously unmanned sequentially. I can do it. Since the boiler is automatically stopped when the sterilization of all the sterilization targets is completed, it is possible to sterilize at midnight. Since all the residual steam in the boiler is supplied to the disinfection target, the boiler can be maintained in the initial state. Also, if the vapor pressure inside the pipe from the boiler to the branch pipe rises above the set value due to malfunction of the sterilization valve, the emergency release valve is opened to prevent abnormal vapor pressure from occurring . When the emergency release valve is activated, the temperature is sensed by a temperature sensor installed at the steam release site, and the boiler is automatically shut down to maintain the equipment.

It is a piping system diagram showing an example of the present invention. It is a partial cross section of disinfecting soil. It is a flowchart of the operation | work which switches a valve automatically after soil disinfection start and advances disinfection one by one.

Explanation of symbols

1 Boiler 2 Steam source valve 3 Steam supply pipe 4 Steam branch pipe 5 Disinfection valve 5a First disinfection valve 5b Second disinfection valve 5c Third disinfection valve 5d Fourth disinfection valve 6 Disinfection hose 6a First disinfection hose 6b 2nd disinfection hose 6c 3rd disinfection hose 6d 4th disinfection hose 7 temperature sensor 7a 1st temperature sensor 7b 2nd temperature sensor 7c 3rd temperature sensor 7d 4th temperature sensor 7e emergency discharge valve Temperature sensor 8 Cable 8a Temperature sensor cable 8b Disinfection valve cable 8c Boiler cable 9 Controller 10 Soil fence 10a First fence 10b Second fence 10c Third fence 10d Fourth fence 11 Sheet 12 Weight 13 Emergency release valve

Claims (4)

In a facility for disinfecting soil with steam generated in a boiler, a branch pipe for supplying the soil to be sterilized is provided on the pipe supplying steam, and a valve that can be opened and closed remotely is provided on each branch pipe. Steam soil disinfection system characterized by that. The steam soil disinfection system according to claim 1, wherein a temperature sensor and a controller capable of transmitting data from a plurality of disinfection targets are provided, and the valve can be automatically opened and closed when a predetermined temperature is reached. In claim 2, the valve for supplying steam is first opened, the other valves are closed, and then one or more of the next valves are opened and at the same time the previously opened valves are closed. Steam soil disinfection system, which is controlled to automatically stop the boiler with all valves or specific valves open after reaching the temperature of The steam according to claim 1, wherein when the steam pressure upstream of the branch pipe becomes higher than a preset allowable pressure, the steam is urgently discharged to the outside and the boiler is automatically stopped at the same time. Soil disinfection system.

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