JP2008202897A - Furnace inside gas leakage preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent leakage of furnace inside gas from a shaft seal part arranged in a waste incinerator, a gasification furnace body and an ancillary apparatus. <P>SOLUTION: A shaft seal mechanism comprises ground packing arranged in a ground box 14, and a sealant ring 20 fitted in a shaft in an intermediate part in the axial direction of this ground packing, and also has: a leakage gas detecting means 17c transmitting a warning by specifying the leaked shaft seal mechanism when detecting a furnace inside gas component by detecting the furnace inside gas component included in gas by pulling in the peripheral gas of the shaft seal mechanism by a conduit 17b; and a sealant supply means for supplying a sealant to the sealant ring 20 from a sealant supply port 25 arranged in the ground box 14. The sealant supply means is constituted so as to supply the sealant to the corresponding shaft seal mechanism with an output signal of the leakage gas detecting means 17c as input. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for detecting leakage of in-furnace gas of a waste incinerator from a device attached to the incinerator and preventing leakage.

In waste incinerators and gasification and melting furnaces, balanced ventilation is performed by suction with an induction fan so as to maintain a constant negative pressure so that combustion gas does not leak outside the furnace. Combustion may change due to changes in the composition and shape of the incinerated product, and the amount of exhaust gas may change accordingly.If there is a change that the furnace pressure control by the induction fan cannot follow, the furnace pressure may become positive. .
On the other hand, in addition to the exhaust gas outlet, waste incinerators and gasification melting furnaces have openings such as an inlet for introducing waste into the furnace, an incombustible discharge port for extracting incombustibles and incineration ash mixed in the waste, etc. When the furnace pressure is changed to a positive pressure, the furnace gas leaks from these openings. For this reason, the opening is provided with a sealing device such as a mechanical seal or a material seal such as dust to prevent leakage of furnace gas to the outside and to prevent outside air from leaking into the furnace during normal negative pressure operation. It has a structure to do.
When the furnace pressure becomes positive due to combustion fluctuations, seal materials such as a gland packing for the rotating shaft seal part such as a screw-type supply device for waste supply, a rotary seal device, a screw-type incombustible material extraction device, etc. If it is loosened or deteriorated, the internal pyrolysis gas may leak.

In the prior art, the shaft penetrating part is handled by periodic tightening of the gland packing and maintenance by exchanging the packing. However, a minute amount of leakage cannot be prevented by the prior art, resulting in a worse working environment.
In the prior art, furnace pressure fluctuations due to furnace gasification combustion are detected by a pressure gauge installed in the furnace exit flue, and the furnace pressure is controlled by an induction fan. The structure of the rotary shaft seal part in the equipment directly connected to the furnace is a gland packing system. If the sealing material such as gland packing loosens or deteriorates over time, the sealing performance becomes extremely poor, and the gland packing is tightened and replaced. It corresponds by such.
Patent Document 1 discloses a method of reducing the pressure in the furnace by increasing the suction force of an ejector that sucks the cracked gas in the furnace into the cracked gas combustion furnace when leaking gas from the seal portion is detected. (See paragraph 0024). Further, in Patent Document 2, even if high pressure nitrogen is sealed in the N ₂ gas sealed space between the squeeze packings attached to both ends of the shaft seal, and CO gas leaks from the squeeze packing, A method for preventing CO gas from leaking to the outside by high-pressure nitrogen is disclosed (see paragraph 0012).
Further, Patent Document 3 discloses a technique for automatically stopping the metering feeder automatically when the pressure in the furnace is positive for a certain period of time or longer, so that the gas in the furnace is not released to the periphery of the furnace without limit. Is disclosed (see paragraph 0007). In Patent Document 4, the gland packing of the shaft seal device is divided into two groups by a spacer ring, the grease reservoir formed in the spacer ring is filled with grease, and further, the inner side of the shaft seal is inside the gland packing. An example is shown in which N ₂ gas for purging the powder entering from the inside is supplied (see paragraph 0006).

JP 2005-265198 A JP 2002-220593 A JP 2001-289422 A Japanese Patent Laid-Open No. 2002-022018

  In the above prior art, fluctuations in furnace pressure due to in-furnace gasification combustion are detected, and equilibrium ventilation control is performed by an induction fan to maintain the inside of the furnace at a negative pressure. However, the properties of waste such as waste always fluctuate. In addition, since the instantaneous fluctuation of the calorific value which is normally not expected can occur, the negative pressure state in the furnace cannot be completely maintained particularly in a fluidized bed furnace having a high combustion rate.

  In addition, the rotary shaft seal part structure in the equipment directly connected to the furnace is a gland packing system, so thermal decomposition that includes unburned gas and harmful dioxins due to loosening of seal materials such as gland packing and deterioration over time. Gas leaks to the outside of the furnace, causing problems such as deterioration of the working environment of the furnace chamber.

  The technique described in Patent Document 1 is not considered in terms of preventing leakage of the shaft seal part, and Patent Documents 2 and 4 do not describe how to deal with gas leakage. Patent Document 3 does not describe the point of preventing the leakage of the shaft seal itself.

  The subject of this invention is preventing the leakage of the gas in a furnace from the shaft seal part provided in the main body of a waste incinerator, the gasification furnace, or an accessory.

  The above-mentioned problems are the shaft seal mechanism provided to prevent the leakage of gas in the furnace from the periphery of the shaft provided in the main body of the incinerator or gasifier of waste or the accessory equipment, and the gas around the shaft seal mechanism. A leakage gas detecting means for detecting a gas component in the furnace contained in the gas and sending an alarm, and a seal for supplying a sealing material to the shaft seal mechanism with an output signal of the leakage gas detecting means as an input An in-furnace gas leakage prevention device having a material supply means, wherein the shaft sealing mechanism is fitted to the shaft at a gland packing disposed around the shaft and an intermediate portion in the gland packing axial direction. An annular sealing material ring that is embedded, a gland box that encloses the outer periphery of the gland packing and the sealing material ring, and accommodates the gland packing, and tightens the gland packing. The seal material ring includes a groove-shaped seal material accommodation space formed in the circumferential direction on the inner peripheral surface and the outer peripheral surface, and a seal material accommodation space between the inner peripheral surface and the outer peripheral surface. A sealing material passage communicating therewith, and the sealing material supply means is configured to supply the sealing material to the sealing material ring from a sealing material supply port provided in the ground box.

  According to the above configuration, when the gas in the furnace leaks from the shaft seal mechanism, a detection signal to that effect is output by the leak gas detection means, and the seal material ring provided in the shaft seal mechanism is responded to this detection signal. Since the sealing material is additionally supplied to the inner and outer sealing material accommodation spaces, the sealing capability of the shaft sealing mechanism is enhanced and leakage can be easily prevented.

  The axial length of the sealing material accommodation space on the outer peripheral surface of the sealing material ring is larger than the axial opening length of the sealing material supply port provided in the ground box, and the anti-ground suppression side end of the sealing material supply port It is desirable to set the seal material ring so that the seal material ring is positioned closer to the ground holding side than the end portion on the anti-ground holding side of the sealing material housing space on the outer peripheral surface of the sealing material ring.

  With such a configuration, even when the land packing is tightened a plurality of times in the longitudinal direction of the shaft, the seal material can be supplied to the inner and outer surfaces of the seal material ring without breaking.

  The leakage gas detection means is connected to the suction port for taking in gas around the shaft seal mechanism, a conduit connected to the suction port, a valve that can be remotely opened and closed interposed in the conduit, and the conduit. It is desirable to include control means that includes a gas detection means, and that sequentially switches the valves that can be remotely opened and closed when a leak of gas in the furnace is detected, and has a function of specifying the leak location.

  By adopting such a configuration, even when a plurality of shaft seal mechanisms are provided, or even when a suction port and a conduit for taking in gas around the shaft seal mechanism are provided for each shaft seal mechanism, the leakage point is automatically detected. It becomes possible to specify.

  The leakage gas detection means includes: an outer casing that hermetically covers the end of the shaft and the shaft seal mechanism; a differential pressure detector that measures and outputs the differential pressure between the atmosphere and the gas inside the outer casing; and the differential pressure detector A differential pressure change amount determination unit that calculates and outputs a differential pressure change amount with an output as an input, and a control unit that has a function of identifying a leak location based on the output of the differential pressure change amount determination unit Also good.

  By adopting such a configuration, it is possible to detect leakage even when a specific component is not detected, and it is possible to avoid leakage detection leakage.

  Further, it is desirable that the seal material supply means is configured to supply the seal material to a shaft seal mechanism in which leakage is specified among a plurality of shaft seal mechanisms, based on the output of the leak gas detection means.

  By adopting such a configuration, it becomes possible to supply additional sealing material only to the leaked shaft sealing mechanism, and it is possible to avoid unnecessary consumption of resources.

  According to the present invention, in an incinerator for waste such as garbage and a gasification melting furnace for pyrolyzing and gasifying waste, gas leakage to the outside of the furnace can be prevented.

  Hereinafter, an embodiment when the present invention is applied to a gasification melting furnace (hereinafter referred to as a pyrolysis gasification furnace) for pyrolyzing and gasifying waste such as waste will be described. FIG. 10 shows the structure of a pyrolysis gasifier to which the embodiment of the present invention is applied. The pyrolysis gasification furnace 1 has an inlet 3 into which the waste 2 is introduced, an exhaust gas outlet 4 through which the pyrolysis gas pyrolyzed in the furnace is exhausted, and incombustible material brought along with the waste 2 is extracted together with sand. An opening portion such as an incombustible discharge port 5 is provided.

  FIG. 11 shows an example of a system of a pyrolysis gasifier to which the embodiment of the present invention is applied. The pyrolysis gas generated in the pyrolysis gasifier 1 is sucked by the induction fan 7 and guided to the exhaust gas treatment facility group 6 through the exhaust gas outlet 4. The induction ventilator 7 and the inlet damper 19 provided on the inlet side thereof detect the pressure inside the pyrolysis gasification furnace 1 so as to maintain a constant negative pressure so that the pyrolysis gas does not leak outside the furnace. It is controlled by a control means (not shown) to control, and the balanced ventilation operation is performed.

  In addition, a dust supply device 8 is installed on the top of the inlet 3 via a supply damper 9 having a rotating shaft. The garbage supply device 8 includes a conveying screw, and throws the waste 2 into the pyrolysis gasification furnace 1 while performing material sealing by storing a certain amount of the waste 2. Further, an incombustible material discharge device 10 having a conveying screw is installed below the incombustible material discharge port 5 to convey the incombustible material and sand discharged from the furnace to the separation equipment 11. The sorting equipment 11 returns only the sand to the pyrolysis gasifier 1 by a sand circulation device 12 having a rotating shaft. Note that the dust supply device 8 and the incombustible material unloading device 10 directly connected to the pyrolysis gasification furnace 1 have a shaft sealing mechanism on the conveying screw, and the supply damper 9 and the sand circulation device 12 have a shaft sealing mechanism on the rotating shaft. Have.

  FIG. 12 shows details of a general rotary shaft sealing mechanism. The illustrated rotary shaft sealing mechanism includes a rotary shaft 13, a ground box 14, a gland retainer 15, and a gland packing 16. The gland packing 16 placed in the ground box 14 is pressurized and deformed by the gland retainer 15, This structure keeps the sealing performance by grounding (contacting) the rotating shaft 13. At this time, it is necessary to adjust the pressurization by the ground restraint 15 to such an extent that the rotating shaft 13 can be easily rotated. Further, when the gland packing 16 is loosened and deteriorated with age, the sealing performance is extremely deteriorated, and the pyrolysis gas may leak out of the furnace.

  FIG. 2 shows the overall configuration of the first embodiment of the in-furnace gas leakage preventing apparatus according to the present invention. The apparatus shown in FIG. 2 has a structure in which the shaft sealing mechanism of the conveying screw of the incombustible material carrying-out apparatus 10 is provided with the sealing material injection device 21 in the pyrolysis gasification furnace apparatus shown in FIG. A pyrolysis gas detector 17 which is a leakage gas detection means, and a rotational speed control device 18 for controlling the induction fan 7 and the inlet damper 19 based on the output signal of the pyrolysis gas detector 17; A control device (not shown) for controlling the dust supply device 8 controls the dust supply device 8 in accordance with a detection signal from the pyrolysis gas detector 17. Other configurations are the same as those described above with reference to FIG.

  That is, the in-furnace gas leakage prevention device according to the present embodiment controls the induction fan 7 and the inlet damper 19 based on the output signals of the sealing material injection device 21, the pyrolysis gas detector 17, and the pyrolysis gas detector 17. A rotational speed control device 18, a sealing material injection device 21 that operates based on an output signal of the pyrolysis gas detector 17, and a control device that controls the waste supply device 8 in accordance with the detection signal of the pyrolysis gas detector 17. It consists of

  The pyrolysis gas detector 17 includes a suction port 17a, a conduit 17b connected to the suction port 17a, and gas detection means 17c connected to the conduit 17b. The gas detection means 17c sucks the gas around the suction port 17a from the suction port 17a through the conduit 17b, and detects whether the sucked gas contains a predetermined component. When a predetermined component is included, the gas detection means 17c outputs a predetermined detection signal. Although the pyrolysis gas contains unburned gas such as CO and CxHx and harmful dioxins, leakage detection by the pyrolysis gas detector 17 of the present embodiment is a typical unburned gas, CO. It is performed by detecting. The pyrolysis gas after detection is returned to the pyrolysis gasification furnace 1 through a pipe line (not shown), and unburned gas or the like is burned.

  FIG. 1 shows a shaft seal mechanism and a seal material injection device 21 according to this embodiment. An annular seal material ring 20 is fitted into the rotary shaft 13 so as to be sandwiched between the gland packings 16 in the gland box 14, that is, in the axial direction intermediate portion of the gland packing 16, and the gland packing 16 is tightened by a gland holding member 15. Yes. A sealing material injection device 21 that is a sealing material supply means is installed on the top of the ground box 14.

  The seal material ring 20 has a seal material accommodation space 20a continuously formed in a groove shape in the circumferential direction on its outer peripheral surface, and a seal formed continuously in a groove shape in the circumferential direction on its inner peripheral surface. There is a material housing space 20b, and the sealing material housing spaces 20a and 20b are communicated with each other by a plurality of sealing material passages 20c.

  The sealing material injection device 21 includes an injection port 25 formed through the ground box 14 in the radial direction, a conduit 23 connected to the injection port 25, a sealing material supply source 22 coupled to the conduit 23, It is comprised including. The sealing material supply source 22 includes a variable supply mechanism that pressurizes and supplies the sealing material according to a detection signal output from the pyrolysis gas detector 17 and increases or decreases the supply amount.

  As shown in FIG. 3, the axial length L1 of the opening on the inner peripheral surface of the injection port 25 serving as the sealing material supply port is set as the axial length of the sealing material accommodation space 20a on the outer peripheral surface of the sealing material ring 20. When L2, L1 <L2 is satisfied, and the axial length L2 is longer than the maximum displacement that can maintain the sealing performance of the gland packing 16.

  When the sealing material is supplied from the sealing material supply source 22, the supplied sealing material is filled into the sealing material accommodation space 20 a on the outer peripheral surface of the sealing material ring 20 through the conduit 23 and the injection port 25. The sealing material filled in the sealing material accommodation space 20 a is then filled into the sealing material accommodation space 20 b on the inner peripheral surface of the sealing material ring 20 through the sealing material passage 20 c and applied to the rotary shaft 13. As a result, a seal layer is formed in the gap between the rotating shaft 13 and the gland packing 16, and leakage of pyrolysis gas is prevented.

  FIG. 4 shows the situation when the shaft seal mechanism of the sealing material injection device 21 of this embodiment is tightened. The gland packing 16 is compressed by holding the gland every time it is tightened, and the axial direction length is gradually shorter than the initial state, and the shaft of the seal material ring 20 disposed in the middle portion of the gland packing 16 with the gland box is accordingly increased. The relative position in the direction, in other words, the opening in the inner peripheral surface of the injection port 25 and the relative position in the axial direction of the sealing material accommodation space 20a are displaced. However, the dimensions of L1 and L2 are adjusted to the above-described conditions, and the axial relative position of the inlet 25 and the sealing material ring 20 at the start of use of the apparatus is suppressed against the anti-ground of the sealing material accommodation space 20a on the outer peripheral surface of the sealing material ring 20. By setting the side end so that it is located on the anti-ground suppression side from the ground suppression side end of the injection port 25 and on the ground suppression side from the anti-ground suppression side end of the injection port 25, Even when the retightening is performed a plurality of times, the injection port 25 is accommodated in the sealing material accommodation space 20a on the outer peripheral surface of the sealing material ring 20, and can be supplied without breaking the sealing material.

  The in-furnace gas leakage prevention apparatus having the above-described configuration operates as follows. When the pyrolysis gas detector 17 detects pyrolysis gas, the pyrolysis gas detector 17 outputs a detection signal, sound, and a warning by a blinking lamp. Based on this detection signal, the rotation speed control device 18 operates the inlet damper 19 and the induction fan 7 of the induction fan 7 so as to maintain the internal pressure of the pyrolysis gasifier 1 at a negative pressure. In addition, the control device that controls the waste supply device 8 suppresses the input amount of the waste 2 by switching the waste supply device 8 to the minimum operation in accordance with the detection signal of the pyrolysis gas detector 17 for a long time. Control to prevent overload combustion. Further, the sealing material injection device 21 includes a variable supply mechanism, and supplies the sealing material intensively to the portion where leakage is detected by the pyrolysis gas detector 17, or increases the supply pressure of the sealing material, Economically and effectively prevent leakage such as increasing or decreasing the supply amount.

  As the sealing material, for example, grease can be used. When grease is used, the sealing material supply source 22 is a grease pot for storing the lubricating grease.

  In the present embodiment, the leakage gas prevention device is provided for the shaft seal mechanism of the conveying screw of the incombustible discharge device 10, but the shaft seal mechanism of the dust supply device 8, the supply damper 9, and the sand circulation device 12 is targeted. A leakage gas prevention device may be provided.

  FIG. 5 shows an overall configuration of Example 2 of the in-furnace gas leakage preventing apparatus according to the embodiment of the present invention. The present embodiment differs from the first embodiment in that the shaft seal mechanism of the dust supply device 8 and the supply damper 9, the non-combustible material discharge device 10 and the sand circulation device 12 has the configuration shown in FIGS. The device 21 is provided for each of the shaft seal mechanisms, and the suction port 17a of the pyrolysis gas detector 17 is provided with a dust supply device 8, a supply damper 9, an incombustible material discharge device 10, and a sand circulation device 12, respectively. The pipes 17b are connected to the suction ports 17a, and the pipes 17b are provided with valves 17d that can be remotely opened and closed. Each conduit 17b is connected to a gas detection means 17c (not shown). Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  The gas detection means 17c has a remote opening / closing function for simultaneously opening and closing the plurality of valves 17d and individually controlling the plurality of sealing material injection devices 21 to control the injection pressure and the injection amount of the sealing material. Means for displaying the name of the device having the function of changing and the leaked shaft seal mechanism is provided.

  The waste 2 supplied to the pyrolysis gasification furnace 1 is not constant in composition, shape, and amount of heat, and the combustion state fluctuates due to fluctuations in their properties. If there is a fluctuation that the furnace pressure control by the induction fan 7 cannot follow due to a temporary increase in the amount of exhaust gas accompanying the fluctuation of the combustion state or a sudden pressure fluctuation, the furnace pressure in the pyrolysis gasifier 1 is instantaneously positive. In such a case, gas leakage to the outside of the furnace tends to occur.

  In this embodiment, therefore, many of the shaft seal mechanisms such as the waste supply device 8 and the supply damper 9, the incombustible material discharge device 10 and the sand circulation device 12 which are directly connected to the pyrolysis gasification furnace 1 are provided with pyrolysis gas. A detector 17 and a sealing material injection device 21 are provided.

  The operation of this embodiment will be described below. In the normal operation state, the gas detection means 17c opens all the valves 17d of the pyrolysis gas detector 17, and sucks gas from each suction port 17a at a predetermined time interval to detect the presence or absence of leaked gas. When leaking gas is detected, an alarm signal is first output and all the valves 17d are once closed. Next, the plurality of valves 17d are opened one by one in order, and the presence or absence of leaking gas is detected.

  When it is determined which pyrolysis gas is contained in the gas sucked from which suction port 17a, the corresponding device name is displayed and the sealing material injection device 21 provided in the shaft seal mechanism of the corresponding device is controlled. Inject the sealing material.

  According to the present embodiment, it is possible to automatically detect which of the plurality of shaft seal mechanisms has leaked the pyrolysis gas, and to automatically perform the leakage prevention process for the leaked shaft seal mechanism. Prompt prevention.

  FIG. 6 shows a main configuration of the in-furnace gas leakage preventing apparatus according to the third embodiment of the present invention. The present embodiment is different from the second embodiment in that the seal material supply source 22 of the seal material injecting device 21 is commonly connected to a plurality of shaft seal mechanisms via a seal material switch 26. The gas detection means 17c is configured to control the sealing material switch 26. The other configuration is the same as that of the second embodiment, and a description thereof will be omitted.

  In this embodiment, the sealing material supply source 22 stores and supplies the sealing material, but does not have a pressurizing function, and the sealing material switch 26 connected immediately below the sealing material supply source 22 applies the pressure and flow rate of the sealing material. Control (variable) and switching supply to each shaft seal mechanism. The sealing material, eg, grease, pressurized by the sealing material switch 26 is guided to a desired conduit 23 by switching the flow path inside the sealing material switch 26 and supplied to a desired shaft sealing mechanism.

  First, the pyrolysis gas detector 17 detects a leak of the pyrolysis gas and determines which device has a leak from the shaft seal mechanism. Next, the pyrolysis gas detector 17 performs switching of the flow path of the sealing material switch 26 and flow rate control (variable), and suppresses leakage of pyrolysis gas by increasing the amount of oil supply at the detection location.

  According to the present embodiment, in addition to the effects of the above-described embodiment, the number of sealing material supply sources 22 can be reduced, and it is possible to reduce the trouble of replenishing the sealing material and the trouble of maintenance.

  FIG. 7 shows a main configuration of the in-furnace gas leakage preventing apparatus according to the fourth embodiment of the present invention. The present embodiment is different from the third embodiment in that a pressure monitoring type leak gas detector is employed instead of the pyrolysis gas detector 17 as the leak gas detection means. The other configuration is the same as that of the third embodiment, and a description thereof will be omitted.

  The pressure monitoring type leak gas detector of the present embodiment includes an airtight cylindrical outer casing 27 that is fixed to the entire outer peripheral surface of the gland box 14 of each shaft sealing mechanism and covers the end of the rotating shaft 13. The first differential pressure detector 28 that measures and outputs the differential pressure ΔP1 between the atmosphere and the gas inside the outer casing 27, and the second differential pressure that measures and outputs the differential pressure ΔP2 between the internal pressure of the apparatus and the internal pressure of the external casing 27 A differential pressure change amount determining means 30a for calculating and outputting a differential pressure change amount by using the output of the detector 29, the first differential pressure detector 28 and the second differential pressure detector 29, and a differential pressure change The control panel 30b is configured to control the seal material switching device 26 based on the output of the amount determination means 30a.

  The first differential pressure detector 28, the second differential pressure detector 29, and the differential pressure change amount determining means 30a are provided for each shaft seal mechanism, and there is one control panel 30b, and each differential pressure change amount determining means 30a. Is used as an input to control the seal material switch 26.

  When incinerator gas or pyrolysis gas leaks into the outer casing 27 from the shaft seal mechanism, the inside of the outer casing 27 is pressurized, and the pressure becomes higher than atmospheric pressure. Further, when incinerator gas or pyrolysis gas leaks from the shaft seal mechanism, the inside of the outer casing 27 is pressurized, and the differential pressure from the internal pressure of the apparatus decreases. The differential pressure change amount determination means 30a calculates and outputs the change amount of the differential pressure detected by the first differential pressure detector 28 and the second differential pressure detector 29. When any of the control panels 30b exceeds a preset management value, the control panel 30b outputs a detection signal indicating that there is a leak. Since changes in these differential pressures are detected, early detection of leakage is possible. The control panel 30b controls the injection amount and pressure of the sealing material at a location where the amount of change in the differential pressure exceeds a predetermined management value.

  According to the present embodiment, in addition to the effects of the third embodiment, there is an effect that gas leakage can be detected even when a specific component such as CO is not detected.

  FIG. 8 shows the main configuration of the in-furnace gas leakage preventing apparatus according to the fifth embodiment of the present invention. The present embodiment differs from the fourth embodiment in that a pyrolysis gas detector 17 is used in combination with a pressure monitoring leak gas detector as a leak gas detection means. The suction port 17a of the pyrolysis gas detector 17 is disposed in the outer casing 27, and the gas sucked from the suction port 17a is input to the gas detection means 17c disposed outside the outer casing 27 through the conduit 17b. The output of the gas detection means 17c is input to the differential pressure change amount determination means 30a. When the detection signal is output from the gas detection means 17c, the differential pressure change amount determination means 30a determines the differential pressure change amount as the predetermined management value. It is configured to output to the control panel 30b with a value exceeding. The suction port 17a is disposed in each external casing 27, and the output of the gas detection means 17c is individually output to each differential pressure change amount determination means 30a corresponding to each external casing 27. The other configuration is the same as that of the third embodiment, and a description thereof will be omitted.

  According to the present embodiment, in addition to the effects of the fourth embodiment, even if the amount of change in the differential pressure is small, if CO is detected, it can be detected as a leak, and a prompt response can be made.

  FIG. 9 shows a main configuration of an in-furnace gas leakage preventing apparatus according to Embodiment 6 of the present invention. The present embodiment is different from Embodiments 3 to 5 in that the sealing material injection device 21 is injected with pressurized air as a sealing material, and other configurations are the same as those in Embodiments 3 to 5. Since there is, description is abbreviate | omitted. FIG. 5 shows an example in which the outer casing 27 is not provided, but the same applies to the case in which the outer casing 27 is provided.

  The sealing material injection device 21 of the present embodiment includes an air filter 35, a pressure blower 31 connected to the outlet side of the air filter 35, a mother pipe 32 connected to the outlet side of the pressure blower 31 via a damper, A pipe 33 branched and connected to communicate the mother pipe 32 and the inlet 25 of the ground box 14, a flow rate adjusting valve 34 interposed in the pipe 33, and a pressure blower 31 and a flow rate adjusting valve 34 are controlled. It includes a control means not shown.

  In the third embodiment, the gas detection means 17c controls the injection of the sealing material by the sealing material switch 26, and in the fourth and fifth embodiments, the control panel 30b controls the injection of the sealing material by the sealing material switch 26. However, also in this embodiment, the gas detection means 17c and / or the control panel 30b are used together to control injection of the sealing material, that is, pressurized air, through the control means (not shown).

The ring structure is also effective in the present embodiment, and the flow rate can be controlled by installing an accessory device.
Each of the above embodiments is directed to a gasification melting furnace that thermally decomposes waste such as waste, but the present invention also applies to a garbage incinerator and gasification reforming equipment that incinerates waste. Applicable. In addition, in facilities having airtightness and fluctuations in internal pressure, it is possible to take measures against leakage by detecting the pressure, the air volume, the wind speed, etc. and attaching this mechanism.

It is sectional drawing which shows the principal part structure of Example 1 of the gas leak prevention apparatus in a furnace which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an overall configuration of a first embodiment of an in-furnace gas leakage preventing apparatus according to the present invention. It is sectional drawing which shows the detail of the part of FIG. It is sectional drawing which shows the condition at the time of retightening of the shaft seal mechanism shown in FIG. It is a systematic diagram which shows the principal part structure of Example 2 of the in-furnace gas leak prevention apparatus which concerns on this invention. It is a fragmentary sectional view which shows the principal part structure of Example 3 of the in-furnace gas leak prevention apparatus which concerns on this invention. It is sectional drawing which shows the principal part structure of Example 4 of the in-furnace gas leak prevention apparatus which concerns on this invention. It is sectional drawing which shows the principal part structure of Example 5 of the in-furnace gas leak prevention apparatus which concerns on this invention. It is sectional drawing which shows the principal part structure of Example 6 of the in-furnace gas leak prevention apparatus which concerns on this invention. It is sectional drawing which shows the opening of a pyrolysis gasification furnace main body. It is a systematic diagram which shows the whole structure of a thermal decomposition gasification furnace apparatus. It is sectional drawing which shows the example of the rotating shaft sealing mechanism of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pyrolysis gasifier 2 Waste 3 Input port 4 Exhaust gas outlet 5 Non-combustible material discharge port 6 Exhaust gas processing equipment group 7 Induction fan 8 Waste supply device 9 Supply damper 10 Non-combustible material discharge device 11 Sorting equipment 12 Sand circulation device 13 Rotation Shaft 14 Gland box 15 Gland restraint 16 Gland packing 17 Pyrolysis gas detector 18 Speed controller 19 Inlet damper 20 Sealing material ring 21 Sealing material injection device 22 Sealing material supply source 23 Conduit 25 Inlet 26 Sealing material switch 27 External Casing 28 First differential pressure detector 29 Second differential pressure detector 30a Differential pressure change amount determination means 30b Control panel 31 Pressure blower 32 Mother pipe 33 Pipe 34 Flow rate control valve

Claims (5)

  A shaft seal mechanism provided to prevent leakage of gas in the furnace from the periphery of the shaft provided in the furnace main body and attached equipment, and the inside of the furnace contained in the gas by drawing the gas around the shaft seal mechanism through a conduit Leakage gas detection means for detecting a gas component and issuing an alarm when a gas component in the furnace is detected, and seal material supply means for supplying the seal material to the shaft seal mechanism with an output signal of the leak gas detection means as an input An in-furnace gas leakage prevention device comprising: a shaft for sealing the shaft seal mechanism, and a gland packing disposed around the shaft; An annular sealing material ring, a gland packing and a gland box that encloses the outer periphery of the sealing material ring and accommodates the gland packing, and tightens the gland packing. The seal ring includes a groove-shaped seal material accommodation space formed in the circumferential direction on the inner peripheral surface and the outer peripheral surface, and the seal material accommodation space between the inner peripheral surface and the outer peripheral surface. A gas leakage in the furnace, wherein the sealing material supply means supplies the sealing material to the sealing material ring from a sealing material supply port provided in the gland box. Prevention device.   2. The in-furnace gas leakage prevention device according to claim 1, wherein an axial length of a sealing material accommodation space on an outer peripheral surface of the sealing material ring is larger than an axial opening length of the sealing material supply port, and the sealing material supply port is provided. The inside of the furnace is characterized in that the seal mechanism is assembled so that the anti-ground suppression side end of the seal material is positioned closer to the ground suppression side than the anti-ground suppression side end of the seal material accommodation space on the outer peripheral surface of the seal material ring. Gas leak prevention device.   3. The in-furnace gas leakage prevention device according to claim 1 or 2, wherein the leakage gas detection means includes an intake port for taking in gas around a shaft seal mechanism, a conduit connected to the intake port, and an interposition in the conduit. A function of specifying the leak location by sequentially switching the valve that can be remotely opened and closed when leakage of gas in the furnace is detected. An in-furnace gas leakage prevention apparatus comprising a control means having   3. The in-furnace gas leakage prevention device according to claim 1, wherein the leakage gas detection means measures an outer casing that hermetically covers an end of the shaft and the shaft sealing mechanism, and a differential pressure between the atmosphere and the gas inside the outer casing. The differential pressure detector to output, and the output of the differential pressure detector to calculate the amount of change in the differential pressure, and based on the output of the differential pressure change amount determining means and the output of the differential pressure change amount determining means An in-furnace gas leak prevention apparatus comprising a control means having a function of specifying a leak location.   5. The in-furnace gas leakage prevention apparatus according to claim 1, wherein the sealing material supply unit is a shaft for which leakage is specified among a plurality of shaft sealing mechanisms based on an output of the leakage gas detection unit. An in-furnace gas leakage prevention device characterized by being configured to supply a sealing material to a sealing mechanism.

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