JPS6210328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the furnace pressure when the furnace door is opened in a crematorium in which the furnace pressure can be adjusted by opening and closing a damper provided in the flue. When the furnace door is opened, a large amount of outside air is prevented from flowing into the furnace to prevent cooling.
The object of the present invention is to provide a method that aims to shorten the cremation time when reusing a furnace.

Unlike industrial furnaces and combustion furnaces, crematoriums are largely influenced by human emotions, and if a crematorium is to be used efficiently, it would be better to perform cremations continuously and it would be better to save energy. Because the inside was so hot from the previous cremation, it started burning almost at the same time as the next coffin was inserted, and the sight of the coffin burning gave the bereaved family and other attendees a hellish feeling and gave them a bad feeling. Because of this, continuous use of the furnace had to be avoided as much as possible. Therefore, taking the above points into consideration, a vestibule is provided in front of the crematorium, and the coffin is placed in the vestibule. After the cremation of the deceased is completed and the ashes are removed, the coffin kept in the front room is inserted into the furnace, so that the deceased's family will not see the body being put into the furnace, and there will be no harm done. A method has been proposed for continuous use of the crematorium without imparting emotion. However, in conventional crematoriums, the door is opened when the coffin is inserted, and the damper in the flue of the furnace is left wide open during that time, just like during cremation. Regardless, a large amount of outside air enters the furnace and heat is wasted, so it was necessary to add the heat released during the second cremation in advance.

This invention was devised to eliminate the above-mentioned drawbacks, and controls the furnace pressure so that it is higher than the pressure during cremation and slightly lower than the outside air when the door of the crematorium is opened. It is. That is, when the door is opened, the drive system that fully opens the damper in the flue of the furnace is shut off by detecting the opening of the door and using the detected signal, the furnace pressure when the furnace is opened and the furnace during cremation are detected. The system is configured to detect the difference in pressure and use the detection signal to activate a drive system that slightly opens the damper, thereby limiting the release of hot air within the furnace.

To explain this invention in detail below, as shown in FIG. 1, the outline of a crematorium is shown, 1 is a main combustion furnace, 2 is a reburning furnace, and both furnaces 1 and 2 are connected by a flue 3.
Smoke generated by cremation in the burner 4 of the main combustion furnace 1 is burned in the burner 5 of the reburning furnace 2, and the gas discharged from the reburning furnace 2 is discharged to the outside air through an exhaust fan 6. Also, dampers 8 and 9 are provided in the flue 3 between the two-burning furnaces 1 and 2 and in the flue 7 leading from the reburning furnace 2 to the exhaust fan 6, and each damper 8 and 9 is opened and closed by a diaphragm motor 10 and 11. A three-way switching solenoid valve 13 is provided in the pneumatic supply line 12 for driving the diaphragm motor 10, and an electro-pneumatic positioner 14 and a pressure reducing valve 15 are interposed at one inlet of the valve 13. The main drive line 16 is connected to a sub drive line 18 which has a pressure reducing valve 17 interposed at another inlet which reduces the pressure to a degree greater than the degree of pressure reduction of the pressure reducing valve 15. Further, a limit switch 20 is provided in relation to the door 19 to generate a signal when the door 19 of the main combustion furnace 1 is opened or closed, and the main drive line 16 of the three-way solenoid valve 13 is set to communicate with the motor 10 in response to the closing signal. , the sub-drive system path 18 is set to communicate with the motor 10 by switching the system in response to an open signal. Furthermore, the pressure in the furnace is sensed by the pressure detector 21, and the specified pressure set by the furnace pressure indicating controller 22 is compared with the detected furnace pressure.If the pressure is higher than the set pressure, the electric/pneumatic positioner 14 to send an open signal, and conversely to send a close signal when the furnace pressure is lower than a specified pressure.

Although the above control has been explained for the diaphragm motor 10 of the main combustion furnace 1, the same structure is applied to the reburning furnace 2, and each member is given the same reference numeral. Also, each diaphragm motor 10,1
1 maintains the dampers 8 and 9 in a fully open state when the drive source is cut off.

Therefore, while the door 19 is closed and cremation is being carried out,
Since the close signal is generated from the limit switch 20, the three-way solenoid valve 13 is in the state where the main drive line 16 is connected, and the furnace internal pressure sensed by the pressure detector 21 is set by the furnace pressure indicating controller 22. When the specified pressure is compared and the set pressure is exceeded, the electro-pneumatic positioner 14 is opened, the diaphragm motor 10 is started by the drive source of the main drive line 16, and the damper 8 is fully opened. In this way, the cremation is completed and door 19
When the is opened, the three-way solenoid valve 13 is switched by the open signal generated by the limit switch 20, and the auxiliary drive line 18 is opened, and the driving force of the line 18 is lower than that of the main drive line 16 by the pressure reducing valve 17. Therefore, the damper 8 is maintained in a slightly open state rather than a fully closed state. At this time, the furnace pressure is increased by opening the door 19, and the electro-pneumatic positioner 14 is closed. When the door 19 is closed again, the damper is driven by the main drive path. Incidentally, in the reburning furnace 2 as well, the same operations as described above are carried out sequentially.

As described above, the control method according to the present invention detects the rise in furnace pressure due to the opening of the door and shuts off the drive system that fully opens the damper, and at the same time detects the opening of the door and slightly opens the damper. Since the damper is activated by the drive system and the pressure inside the furnace is kept at a level slightly lower than atmospheric pressure, even if the door is opened, outside air does not enter by much and the dissipation of high heat inside the furnace is slightly suppressed. Most of the preheating of the first stage is used for the next stage's cremation, which greatly shortens the cremation time. Furthermore, this method can be implemented with a simple structure.

Furthermore, if a coffin is placed in the furnace and immediately burns and produces smoke, if the damper is left fully open, a large amount of outside air and smoke will flow into the reburning furnace. At this time, since there is usually a limit to the amount of heat generated by the burner of the reburning furnace, combustion processing per unit time becomes impossible and results in incomplete combustion being emitted. In order to adjust the amount of smoke, the inflow of smoke is controlled according to the processing capacity of the reburning furnace, and even the smoke that is generated when the coffin is placed can be completely combusted and released.

[Brief explanation of the drawing]

The drawing is a front view schematically showing a structure capable of implementing the control method according to the present invention. 1... Main combustion furnace, 2... Reburning furnace, 3, 7... Flue, 4,
5... Burner, 6... Exhaust fan, 8, 9... Damper, 10, 11... Diaphragm motor, 12...
Supply line, 13... Three-way solenoid valve, 14... Electric/pneumatic positioner, 15, 17... Pressure reducing valve, 16... Main drive line, 18... Sub drive line, 19... Door, 20... Limit switch, 21... Pressure detection 22...Furnace pressure indicating controller.

Claims (1)

[Claims] 1 When the cremation is finished and the furnace door is opened, the opening of the door is detected, and at the same time the difference between the furnace pressure when the door is opened and the furnace pressure during cremation is detected, and the detection signal of the furnace pressure difference is used. Furnace pressure of a crematorium that shuts off the main drive system that maintains the damper in the flue of the cremator in a nearly fully open state, and starts the sub drive system that operates the damper to a slightly open state in response to a door open detection signal. Control method.