JP3628353B2 - Cremation furnace exhaust system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an exhaust apparatus for a cremation furnace that discharges gas from the inside of a plurality of cremation furnaces and keeps the internal pressure of the cremation furnace in an operating state constant.
[0002]
[Prior art]
The interior of the cremation furnace is maintained at a negative pressure relative to the atmospheric pressure so that gas does not leak from locations other than the exhaust stack. This is achieved by sucking and discharging gas from the cremation furnace and the exhaust pipe leading to the cremation furnace with an exhaust fan interposed in the exhaust pipe. However, when the gas is sucked as it is from the burning cremation furnace, the exhaust fan is deteriorated by the heat of the gas, so that an exhaust air intake is provided in the exhaust pipe to reduce the temperature of the exhaust gas. Some of them have a function of automatically adjusting the damper opening degree of the outside air intake while detecting the temperature of the exhaust gas.
[0003]
[Problems to be solved by the invention]
However, when outside air is taken into the exhaust pipe, the internal pressure of the exhaust pipe rises and the internal pressure of the cremation furnace is also affected, causing gas to leak from the inside of the cremation furnace. Conventionally, since the rotational speed of the exhaust fan is constant, the amount of gas discharged is adjusted by adjusting the opening of the furnace pressure regulating damper provided in the exhaust pipe communicating with each cremation furnace. Therefore, the rotational speed of the exhaust fan is set according to the case where the entire cremation furnace is operating and the exhaust temperature is highest, that is, when the damper of the outside air intake is the most open, and only a single cremation furnace is used. When operating, there has been a problem that the amount of gas discharged becomes excessive, leading to a decrease in the internal temperature of the cremation furnace, waste of fuel gas, and air pollution.
[0004]
In view of the above circumstances, an object of the present invention is to provide an exhaust device for a cremation furnace that can adjust the pressure inside the exhaust pipe to a suitable state while preventing a decrease in the internal temperature of the cremation furnace and waste of fuel gas.
[0005]
[Means for Solving the Problems]
An exhaust apparatus for a cremation furnace according to the present invention made to solve the above-mentioned problems is provided with a sub-exhaust pipe communicating with each of a plurality of cremation furnaces, and an exhaust pipe through a main exhaust pipe communicating with each sub-exhaust pipe In an exhaust apparatus for a cremation furnace that discharges more gas, an external air intake with an intake damper is provided in a main exhaust pipe, and the cremation furnace and the cremation furnace are provided between the external air intake and the exhaust pipe of the main exhaust pipe By interposing an exhaust fan that sucks and discharges gas from the inside of the exhaust pipe, the temperature of the gas flowing from the cremation furnace into the main exhaust pipe is adjusted by controlling the opening degree of the intake damper of the outside air intake, and by taking in outside air The pressure inside the pipe that deviates from the appropriate value is adjusted to be an appropriate value by controlling the rotation speed of the exhaust fan and the opening of the pressure regulating damper in the pipe, and further, the intake of the outside air, the number of operating cremation furnaces and Depending on the combustion state, it changes every moment. The internal pressure of each cremation furnace for is obtained by can be adjusted by control of the opening degree of the furnace pressure control damper.
[0006]
[Action]
An in-pipe pressure detector is provided in the main exhaust pipe near the cremation furnace from the outside air intake, and when the detected pressure of the pressure detector is lower than the set value, the rotation speed of the exhaust fan is reduced and the detected pressure of the same pressure detector is reduced. If the pressure is higher than the set value, pressure control means for increasing the rotation speed of the exhaust fan is provided to prevent excessive exhaust gas from being pulled due to excessive rotation of the exhaust fan. Further, with respect to the rotation control of the exhaust fan, the same effect can be obtained by controlling the opening degree of the furnace pressure regulating damper according to the output of the in-pipe pressure detector while keeping the rotation speed of the exhaust fan constant. obtain.
[0007]
【Example】
Hereinafter, an exhaust apparatus for a cremation furnace according to the present invention will be described in detail based on an example in which two cremation furnaces 1 and 1 are provided for one exhaust apparatus.
[0008]
In this embodiment, the main exhaust pipe 3 communicating with the exhaust cylinder 4 communicates with the two cremation furnaces 1 and 1 via the auxiliary exhaust pipes 2 and 2, and the main exhaust pipe 3 is connected to the outside air intake with the intake damper 5. An inlet 6 is provided, and between the outside air intake 6 and the exhaust tube 4 of the main exhaust pipe 3, the cremation furnaces 1, 1 and the main and auxiliary exhaust pipes 2, 2, 3 leading to the cremation furnaces 1, 1 An exhaust fan 7 for sucking and discharging gas from the inside is interposed.
[0009]
A gas temperature detector 8 for detecting the temperature of the gas flowing through the main exhaust pipe 3 is provided between the outside air intake 6 inside the main exhaust pipe 3 and the exhaust fan 7. According to the flowchart of FIG. 6, the measured temperature by the gas temperature detector 8 is compared with a preset temperature registered. If the measured temperature is lower than the set temperature, the intake damper 5 is closed by a certain amount, and the measured temperature by the gas temperature detector is measured. Is higher than the set temperature, the intake damper 5 is controlled to be opened by a certain amount.
[0010]
Further, an in-pipe pressure detector 13 is provided near the cremation furnace 1, 1 from the outside air intake 6 of the main exhaust pipe 3, and the pressure measured by the pressure detector 13 is set by the in-pipe pressure adjusting means 14 according to the flowchart of FIG. When the pressure is lower, the rotation speed of the exhaust fan 7 is decreased, and when the pressure measured by the atmospheric pressure detector 13 is higher than the set pressure, the rotation speed of the exhaust fan 7 is increased.
[0011]
Furthermore, in-furnace pressure regulating dampers 10 and 10 are provided in the sub-exhaust pipes 2 and 2, respectively, and in-crease furnace pressure detectors 11 are provided in the cremation furnaces 1 and 1, respectively. When the pressure measured by the furnace pressure detector 11 is lower than the set pressure, the furnace pressure regulating damper 10 is closed by a certain amount, and when the pressure measured by the furnace pressure detector 11 is higher than the set pressure, the pressure inside the furnace is adjusted. Control is performed to open the damper 10 by a certain amount.
[0012]
In the present embodiment, the gas temperature adjusting means 9 and the in-furnace pressure adjusting means 12 control the opening degree of the dampers 5 and 10 based on the outputs of the detectors 8 and 11 used in each case, and the in-pipe pressure adjusting means 14 is controlled. Attempts were made both for controlling the rotational speed of the exhaust fan 7 based on the output of the in-pipe pressure detector 13 and for controlling the opening of the in-pipe pressure regulating damper 15.
[0013]
The opening control of the dampers 5, 10, 15 based on the outputs of the detectors is performed by rotating a fan motor (not shown) that rotates the exhaust fan 7 at a constant speed, and the damper drive motors 16, 17, 18, a motor capable of continuously starting, stopping, braking, reversing and slow speed operation is selected, and a microcomputer system including the motor interface, for example, as shown in the flowcharts of FIGS. The rotation direction and rotation angle of the damper drive motors 16, 17, 18 are controlled. On the other hand, the rotational speed control of the exhaust fan 7 based on the output of the in-pipe pressure detector 13 uses, for example, an induction motor as a fan motor, and is driven as a driver 19 of the induction motor based on an input from the in-pipe pressure detector 13. A so-called inverter that can arbitrarily change the frequency of the signal is used. As a result, the fan motor rotates at a speed substantially proportional to the frequency of the drive signal, and is efficiently controlled with power close to the necessary minimum.
[0014]
By controlling the opening degree of the damper and the rotational speed of the fan motor according to the flowchart, the internal pressures of the main and sub exhaust pipes 2, 2, and 3, the internal pressure of the cremation furnaces 1, 1 and the temperature of the exhaust gas are measured values. Simultaneously with the occurrence of a deviation from the set value, the Peak to Peak of the deviation is corrected to the set value in a manner that gradually decreases with the passage of time (execution time of the state monitoring loop).
[0015]
Even if the internal pressure of the main exhaust pipe 3 is constant, when only one cremation furnace 1 is operating and when two cremation furnaces 1 and 1 are both operating, The atmospheric pressure inside 1 is different. Moreover, it is satisfactory if the structures of the auxiliary exhaust pipes 2 and 2 communicating with the respective cremation furnaces 1 and 1 are equal to each other, but since such a structure is rare, Generally, a difference occurs between the internal pressures of the cremation furnaces 1 and 1 due to the difference in suction resistance.
[0016]
Since the present embodiment is configured as described above, an appropriate amount of outside air is taken into the main exhaust pipe 3 in accordance with the temperature of the gas flowing through the main exhaust pipe 3, and the rotational speed of the exhaust fan 7 or the pressure regulation in the pipe The opening degree of the damper 15 changes so as to follow the change in the internal pressure of the main exhaust pipe 3 due to the inflow of the outside air, and the internal pressure of the main exhaust pipe 3 is kept constant. Further, the amount of gas leaking from the cremation furnace 1 to the sub exhaust pipe 2 is changed by adjusting the opening of the furnace pressure regulating damper 10, and the pressure inside the furnace is finely adjusted to a set value for each cremation furnace 1.
[0017]
【The invention's effect】
As described above, according to the cremation furnace exhaust apparatus of the present invention, not only can the inside of the cremation furnace be maintained at a constant negative pressure state, but also the amount of gas circulating in the cremation furnace is controlled to the minimum necessary by appropriate suction. Therefore, it is possible to prevent a decrease in the internal temperature of the cremation furnace and an accompanying increase in fuel gas consumption.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of an exhaust apparatus for a cremation furnace according to the present invention.
FIG. 2 is an example of a control flowchart of an in-pipe pressure regulating means of the exhaust device.
FIG. 3 is a schematic view showing another example of the in-pipe pressure adjusting means.
FIG. 4 is an example of a control flowchart of the in-pipe pressure adjusting means.
FIG. 5 is an example of a control flowchart of an in-furnace pressure regulating means of the exhaust device.
FIG. 6 is an example of a control flowchart of the temperature adjusting means in the pipe of the exhaust device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cremation furnace 2 Sub exhaust pipe 3 Main exhaust pipe 4 Exhaust pipe 5 Intake damper 6 Outside air intake 7 Exhaust fan 8 Gas temperature detector 9 Gas temperature control means 10 In-furnace pressure regulation damper 11 In-furnace pressure detector 12 In-furnace condition Pressure means 13 In-pipe pressure detector 14 In-pipe pressure regulating means 15 In-pipe pressure regulation damper

Claims (2)

A sub exhaust pipe (2) communicating with each of the plural cremation furnaces (1) is provided, and gas is discharged from the exhaust pipe (4) via the main exhaust pipe (3) communicating with each sub exhaust pipe (2). In the cremation furnace exhaust system,
An outside air intake (6) with an intake damper (5) is provided in the main exhaust pipe (3), and the cremation is made between the outside air intake (6) and the exhaust pipe (4) of the main exhaust pipe (3). An external air intake (6) and an exhaust fan (7) are interposed via an exhaust fan (7) for sucking and discharging gas from the furnace (1) and the exhaust pipe (2, 3) leading to the cremation furnace (1). Is provided with a gas temperature detector (8), and when the detected temperature of the gas temperature detector (8) is higher than a set value, a gas temperature adjusting means (9) for opening a certain amount of the intake damper (5) is provided. In addition, an in-furnace pressure regulating damper (10) is provided in each auxiliary exhaust pipe (2), an in-furnace pressure detector (11) is provided in each cremation furnace (1), and the in-furnace pressure detector (11) When the detected atmospheric pressure is higher than the set value, an in-furnace pressure regulating means (12) for opening a certain amount of the in-furnace pressure regulating damper (10) is provided, and the main exhaust pipe 3), an in-pipe pressure detector (13) is provided on the side of the cremation furnace of the outside air inlet (6). When the detected pressure of the in-pipe pressure detector (13) is lower than a set value, the exhaust fan (7) A cremation furnace characterized in that it is provided with in-pipe pressure regulating means (14) for reducing the rotation speed and increasing the rotation speed of the exhaust fan (7) when the detected atmospheric pressure of the same pressure detector (13) is higher than a set value. Exhaust system. In-pipe pressure regulating means (14) according to claim 1, wherein a pipe pressure-regulating damper (15) is provided inside the main exhaust pipe (3), and the detected atmospheric pressure of the in-pipe pressure detector (13) is higher than a set value. An exhaust device for a cremation furnace, wherein the pipe pressure regulating damper (15) is opened by a certain amount.

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