JP2013007536A - Cleaning device and cleaning method for honeycomb heat storage body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To air-purge cell holes of a stationary honeycomb heat storage body to remove dust, scale or the like in the cell holes, without causing increase of pressure loss or requiring arrangement of mechanical drive mechanisms in an air feed and exhaust flow passage.SOLUTION: A cleaning device of a honeycomb heat storage body (1) includes: a high pressure gas feed pipe (3) connected to a high pressure feed source (2); an ejection tube (5) connected to the high pressure gas feed pipe through a rotary joint (4); and a bearing (6) rotatably supporting the ejection tube. The rotary joint, the bearing and the ejection tube are arranged inside the air feed and exhaust flow passage (P) of a combustion system. The ejection tube includes: jetting apertures (7) for cleaning which blow an opened end face (Ha) of the heat storage body with jets of high pressure gas; and jetting apertures (8) for driving which blow jets for driving substantially parallel to the opened end face. The ejection tube is rotated by thrust forces acting on the ejection tube as reaction of the jets for driving.

Description

  TECHNICAL FIELD The present invention relates to a cleaning device and a cleaning method for a honeycomb-type heat storage body, and more specifically, has a large number of narrow flow paths in which a combustion exhaust gas in a combustion zone and a heated fluid such as combustion air alternately flow. The present invention relates to a cleaning device or a cleaning method for cleaning a heat storage body having a honeycomb structure.

  Combustion exhaust gas and combustion air pass alternately as a combustion system of various combustion furnaces or combustion facilities such as waste incinerators, waste gasification melting furnaces, boilers, waste heat recovery boilers, heating furnaces or coal gasification furnaces A regenerative type alternating combustion system using a heat storage body having a honeycomb structure is known (Japanese Patent Laid-Open Nos. Hei 6-213585 and 2004-3404041, etc.). In addition, in a heating apparatus that heats a supply fluid such as water vapor or nitrogen gas to a high temperature and supplies it to a reaction furnace, a solid fuel gasification facility, etc., a heat storage body having a honeycomb structure through which combustion exhaust gas and supply fluid alternately pass There is known a supply air heating system using the above (Japanese Patent Laid-Open No. 10-246428, etc.).

  In such a honeycomb type heat accumulator, the combustion exhaust gas in the furnace periodically passes through the narrow flow path, so that dust, scale, etc. in the combustion exhaust gas tend to gradually adhere to the cell partition walls. Since the combustion gas and combustion air are alternately passed through the narrow flow path in the opposite direction, dust, scale, etc. adhering to the cell partition walls are removed to some extent by the combustion air, but a large amount When combustion exhaust gas containing dust, scales, etc. is periodically passed through the honeycomb-type heat storage body, a relatively large amount of dust, scales, etc. may adhere to the cell partition walls in the narrow channel after a long period of operation. If such a large amount of dust, scale, etc. adheres to the cell partition walls in the narrow channel, a problem of clogging of the narrow channel occurs.

  Such a problem of clogging of the honeycomb cell similarly occurs in an alternating combustion system using a large number of ceramic balls, ceramic pellets, and the like as a heat storage body. The dust, scale, etc. adhering to the heat accumulator can be removed by applying vibration to the heat accumulator or stirring the accumulated layer of the heat accumulator with a stirring blade or the like (JP-A-7-158825, JP-A-11-11). 132444, JP-A-2005-257200, etc.). However, in the honeycomb-type heat storage body, such cleaning means such as vibration or stirring cannot be employed.

  As a technique for cleaning the narrow flow path of the honeycomb-type heat storage body, a heat storage burner configured to clean the narrow flow path of the rotary honeycomb-type heat storage body with a high-pressure air jet is described in JP-A-2007-327659. Has been. This cleaning device is for cleaning a heat storage body of a metal honeycomb that rotates continuously, and fixes a jet pipe of compressed air in a radial direction adjacent to an opening end face of the heat storage body, and narrows the rotating heat storage body In this configuration, a high-pressure air jet is blown into the flow path.

JP-A-6-213585 JP 2004-354041 A Japanese Patent Laid-Open No. 10-246428 JP 7-158825 A JP-A-11-132444 JP-A-2005-257200 JP 2007-327659 A

  As described in Patent Document 7, in a combustion system using a rotating honeycomb type heat storage body, the heat storage body itself rotates, so that the high pressure air injection pipe can inject high pressure air toward the end face of the heat storage body. What is necessary is just to fix to a position, and, thereby, an injection pipe can blow high pressure air on the perimeter and whole area of a thermal storage body according to the rotational motion of a thermal storage body.

  However, in a combustion system using a fixed (stationary) honeycomb-type heat storage body used under relatively high temperature conditions, a cleaning using a rotational motion of the heat storage body as in the cleaning device of Patent Document 7 is performed. The device cannot be adopted.

  FIGS. 11, 12, and 13 are cross-sectional views showing, as a comparative example, the configuration of a heat storage body cleaning device that is assumed to inject high-pressure air to a fixed honeycomb heat storage body.

  In each of the cleaning devices shown in FIGS. 11 to 13, a honeycomb type heat storage body H made of a ceramic honeycomb is fixed at a predetermined position in the supply / exhaust pipe T. The combustion air A and the combustion exhaust gas E in the in-furnace region F alternately pass through the pipe flow path P of the supply / exhaust pipe T. Therefore, the combustion air A and the combustion exhaust gas E are narrow flow paths of the heat storage body H. (Cell hole) Hc is circulated alternately. The exhaust heat of the combustion exhaust gas E is stored in the heat storage body H, the sensible heat stored in the heat storage body H is radiated to the combustion air A, and the combustion air A is heated.

  In the cleaning device shown in FIG. 11, high-pressure air that blows high-pressure air C onto the low-temperature side (outside of the furnace) end surface Ha of the heat storage body H in order to remove dust, scale, and the like attached in the narrow flow path Hc of the heat storage body H The injection nozzle N is disposed in the central portion of the pipe flow path P. In order to spray high-pressure air C over the entire area of the end surface Ha by such a cleaning device and clean all the narrow flow paths Hc, a sufficient distance L between the nozzle N and the end surface Ha is ensured. The jet must be diffused throughout the end face Ha. However, since the dynamic pressure of the air jet decreases until it reaches the end face Ha, it is difficult to ensure a high-pressure and high-speed air flow that can purge the narrow channel Hc. In particular, dust, scale, etc. contained in the combustion exhaust gas E tend to adhere to the cell partition walls of the narrow channel Hc close to the high temperature side (furnace inside) end face Hb, so that an air flow that blows through the narrow channel Hc is secured. The heat storage body H cannot be sufficiently cleaned by the cleaning device having a difficult structure (FIG. 11).

  On the other hand, as shown in FIG. 12, the cleaning device is configured such that a large number of high-pressure air injection nozzles N are fixed close to the end surface Ha and high-pressure air is blown from the large number of nozzles N to the entire end surface Ha. Conceivable. However, in the cleaning device having such a configuration, a large number of nozzle supports Na having a high-pressure air supply path are arranged in the pipe flow path P, so that the original flow of the air flow or gas flow is hindered. As a result, the pressure loss of the exhaust flow increases, and as a result, the air supply fan or blower and the air blowing load of the exhaust fan or blower increase.

  In order to solve such a problem, as shown in FIG. 13, the high-pressure air injection nozzle N is disposed in the vicinity of the end face Ha, the nozzle support Na having a high-pressure air supply path is moved, and the nozzle N is moved to the end face Ha. It is possible to assume a configuration of a cleaning device that is moved to the entire area. According to such a cleaning device, it may be possible to reliably remove dust, scale, and the like in the narrow channel Hc by sequentially blowing high-pressure air over the entire end surface Ha by the nozzle N and air purging the narrow channel Hc. . However, it is extremely difficult in practice to install a drive mechanism for moving the nozzle N and the nozzle support Na in the high-temperature air supply / exhaust pipe T.

  The present invention has been made in view of such circumstances, and an object of the present invention is to substantially increase the pressure loss of the supply air flow and the exhaust flow, and to supply and exhaust the mechanical drive mechanism. Provided are a cleaning device and a cleaning method for a honeycomb-type heat storage body that can purge the cell holes of a fixed honeycomb-type heat storage body without disposing them in a flow path and remove dust, scale, and the like in the cell holes. There is.

In order to achieve the above object, the present invention cleans the honeycomb structure heat accumulator (H) in which the flue gas (E) and the combustion air or the supply fluid (A) alternately flow through the cell holes (Hc). In the heat storage body cleaning device (1),
A high-pressure gas supply source (2) for supplying high-pressure gas for cleaning the heat storage body;
A high-pressure gas feed pipe (3) connected to the high-pressure gas supply source;
A discharge pipe (5) connected to the feed pipe via a rotary joint (4);
A bearing (6) that rotatably supports the discharge pipe around a rotation center axis (X) substantially parallel to the axis of the heat storage body;
The rotary joint, bearing and discharge pipe are disposed in a supply / exhaust flow path (P) for combustion exhaust gas and combustion air or supply fluid,
The discharge pipe includes a cleaning injection port (7) for blowing a jet (J) of high-pressure gas to the open end faces (Ha, Hb) of the heat storage body, and a direction substantially parallel to the open end face of the heat storage body And a drive injection port (8) for injecting a jet of high-pressure gas (G),
A heat storage body cleaning device is provided, wherein the discharge pipe is rotated about the rotation center axis by a thrust (propulsive force) acting on the discharge pipe as a reaction of the driving jet.

The present invention also provides a heat storage body cleaning method for cleaning a heat storage body having a honeycomb structure in which combustion exhaust gas and combustion air or supply fluid alternately flow through the cell holes.
A rotary joint, a bearing, and a discharge pipe are arranged in a supply / exhaust flow path for combustion exhaust gas and combustion air or supply air fluid, and the discharge pipe is rotatably supported by the bearing, and the rotary joint is inserted through the rotary joint. Connecting the discharge pipe to a high-pressure gas feed pipe,
A high-pressure gas from a high-pressure gas supply source is supplied to the feed pipe, and a high-speed jet for honeycomb cleaning is blown from the cleaning injection port of the discharge pipe to the open end face of the heat storage body, and substantially the open end face. A jet of driving in a parallel direction is jetted from a driving jet of the discharge pipe,
The dust or scale adhering to the cell partition walls of the heat storage body is discharged to the supply / exhaust flow channel on the opposite side by the high-speed jet for honeycomb cleaning, and the thrust acting on the discharge pipe as a reaction of the drive jet, A heat storage body cleaning method is provided, wherein the discharge pipe is rotated.

  According to the above configuration of the present invention, the supply air flow and the exhaust air flow are only partially blocked by the discharge pipe, the rotary joint, and the bearing having a relatively small diameter or a small cross-sectional dimension, and the discharge pipe is rotated. Since the thrust is obtained by the driving jet, it is not necessary to dispose a mechanical driving mechanism in the supply / exhaust flow path. Therefore, the cleaning device can be provided in the supply / exhaust flow path without substantially increasing the pressure loss of the supply air flow and the exhaust flow and without disposing a mechanical drive mechanism in the supply / exhaust flow path. . In addition, the high-speed jet for cleaning the honeycomb air purges the cell holes of the honeycomb-type heat accumulator and forcibly discharges the dust, scale, etc. in the cell holes from the cell holes, so that the dust, scale, etc. in the cell holes are reliably removed. Can be removed.

  Preferably, the discharge pipe extends from the rotary joint to the first tubular part (5a) extending substantially parallel to the central axis of the heat storage body, and from the first tubular part substantially parallel to the open end surface of the heat storage body. And a second tube portion (5b) that extends and includes a cleaning spray port and a drive spray port. In another preferred configuration, the discharge pipe includes a first tube portion extending from the rotary joint substantially parallel to the central axis of the heat storage body, and a first tube portion substantially parallel to the open end surface of the heat storage body. A second tube portion extending from the first tube portion and having a cleaning injection port; and a third tube portion (5d) extending from the first tube portion and having a drive injection port in an upper region of the second tube portion. Have Preferably, the third tubular portion extends from the first tubular portion substantially parallel to the open end surface of the heat storage body, and a throttling mechanism is disposed in an in-pipe region of the third tubular portion. The thrust acting on the discharge pipe can be adjusted by providing a throttle mechanism (pressure adjusting mechanism) in the flow path of the third tube portion for supplying the high-pressure gas to the driving injection port. If desired, discharge pipes may be provided for each of the plurality of heat storage bodies, and the discharge pipes may be interconnected by a link mechanism (9).

  More preferably, the cleaning device includes control means for controlling the fluid pressure of the high-pressure gas supplied to the discharge pipe so as to control the injection pressure of the cleaning injection port and the thrust of the discharge pipe. The jetting pressure of the cleaning jet and the thrust of the discharge pipe are controlled by controlling the fluid pressure of the high-pressure gas. Optionally, the cleaning device has a controller for periodically supplying high pressure gas to the feed pipe or for supplying high pressure gas to the discharge pipe in connection with operation of the combustion system or feed air heating system.

  Preferably, the heat storage body is made of a ceramic honeycomb fixed to an air supply / exhaust flow path, and the discharge pipe is disposed so as to blow a jet of high-pressure gas to a low temperature side open end surface (Ha) of the heat storage body. . Preferably, high-pressure air or inert gas is used as the high-pressure gas, and the dust or scale discharged to the high-temperature side air supply / exhaust flow path burns in the combustion area of the combustion system or the supply air heating system. If desired, the discharge pipe, the joint, and the bearing having high heat resistance may be used, and the discharge pipe, the joint, and the bearing may be arranged so as to blow a jet of high-pressure gas to the open end surface of the heat storage body on the high temperature side.

  According to the cleaning device and the cleaning method of the present invention, the pressure loss of the supply air flow and the exhaust flow is not substantially increased, and the mechanical drive mechanism is not disposed in the supply / exhaust flow path, and is fixed. Air purging of the cell holes of the honeycomb type heat accumulator can remove dust, scales and the like in the cell holes.

FIG. 1 is a longitudinal sectional view, a sectional view taken along line II, and a perspective view schematically showing a configuration of a supply / exhaust system of a regenerative alternating combustion system provided with a cleaning device according to the present invention. 2 is a front view, a bottom view, a side view, a sectional view taken along line II-II, and a sectional view taken along line III-III of the compressed air feeding pipe shown in FIG. FIG. 3 is a longitudinal sectional view, a sectional view taken along line IV-IV, and a perspective view showing a modified example of the cleaning device. FIG. 4 is a longitudinal sectional view and a VV sectional view showing a further modified example of the cleaning device. FIG. 5 is a longitudinal sectional view and a partially enlarged sectional view showing the configuration of the regenerative alternating combustion system including the cleaning device shown in FIG. FIG. 6 is a longitudinal sectional view showing the combustion system shown in FIG. 5 in a state after switching to the combustion mode. FIG. 7 is an enlarged cross-sectional view taken along line VI-VI in FIG. FIG. 8 is a perspective view showing still another modified example of the cleaning device. FIG. 9 is a perspective view of the discharge pipe shown in FIG. FIG. 10 is a partial longitudinal sectional view of the discharge pipe shown in FIG. FIG. 11: is the longitudinal cross-sectional view which shows the structure of the cleaning apparatus which concerns on a comparative example, and XI-XI sectional view taken on the line. FIG. 12 is a longitudinal sectional view and a sectional view taken along line XII-XII showing a configuration of a cleaning device according to another comparative example. FIG. 13 is a longitudinal sectional view and a sectional view taken along line XIII-XIII showing a configuration of a cleaning device according to still another comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view, a sectional view taken along line II, and a perspective view schematically showing a configuration of a supply / exhaust system of a regenerative alternating combustion system provided with a cleaning device according to the present invention. 2 is a front view, a bottom view, a side view, a sectional view taken along the line II-II, and a sectional view taken along the line III-III of the compressed air discharge pipe shown in FIG.

  The heat accumulator H is made of a ceramic heat accumulator having a cylindrical honeycomb structure in which the combustion exhaust gas E and the combustion air A flow alternately, and is disposed in the pipe flow path P of the air supply and exhaust pipe T. Combustion air A (indicated by solid line arrows) pumped by an air supply fan or an air supply blower is supplied to an in-pipe flow path P of the supply / exhaust pipe T, and the in-furnace region F of the combustion furnace or the burner of the combustion furnace Etc. The combustion air A flows into the narrow flow path Hc (honeycomb cell) from the supply side (low temperature side) end face Ha of the heat storage body H, and is in heat transfer contact with the cell partition walls of the heat storage body H to heat the heat storage body H. Receive heat. The combustion air A that has been heated by heat exchange with the cell partition wall flows out of the furnace side (high temperature side) end face Hb of the heat storage body H, and is supplied to the in-furnace region F and the like.

  When the supply of the combustion air A is stopped, the combustion exhaust gas E (indicated by a broken line arrow) in the in-furnace region F is exhausted from the pipe flow path P. The combustion exhaust gas E flows into the narrow flow path Hc from the furnace side end face Hb of the heat storage body H, and heat transfer contacts the cell partition walls of the heat storage body H to heat the heat storage body H. The combustion exhaust gas E that has fallen in temperature by heat exchange with the cell partition wall flows out of the supply side end face Ha of the heat storage body H and is exhausted outside the system.

  An air supply mode for supplying the combustion air A to the furnace region F and the like and an exhaust mode for exhausting the combustion exhaust gas E are alternately switched at a predetermined time interval (for example, 30 seconds). Dust, scales, and the like contained in the combustion exhaust gas E adhere to the cell partition walls in the narrow channel Hc, but are removed to some extent by the combustion air A that flows in the narrow channel Hc in the opposite direction. However, when the combustion exhaust gas E contains a large amount of dust, scale, etc., a state in which a relatively large amount of dust, scale, etc. adheres to the cell partition wall is likely to occur due to long-time operation.

  The supply / exhaust system of the combustion system shown in FIG. 1 includes a cleaning device 1 for removing dust, scale, and the like attached to the cell partition wall in this way. The cleaning device 1 includes an air compressor 2, a compressed air supply pipe 3, a rotary joint 4, a compressed air discharge pipe 5, and a bearing 6, so that a high-pressure air jet J is blown onto the supply side end face Ha of the heat storage body H. Composed.

  The compressed air supply pipe 3 connected to the air compressor 2 penetrates the pipe wall of the supply / exhaust pipe T on the supply side (low temperature side) of the heat storage body H and extends in the radial direction into the pipe flow path P. . The feed pipe 3 bends downward in the central axis X of the supply / exhaust pipe T and extends in the central axis X direction. The end of the feed pipe 3 is connected to the compressed air discharge pipe 5 through the rotary joint 4. The rotary joint 4 interconnects the feed pipe 3 and the discharge pipe 5 so as to be relatively rotatable about the central axis X.

  The discharge pipe 5 is rotatably supported by a bearing 6. The bearing 6 is fixed to the pipe wall of the air supply / exhaust pipe T by a support member (not shown) such as a bracket. The discharge pipe 5 extends downward along the central axis X, bends horizontally, extends in the radial direction, and terminates in the vicinity of the inner peripheral wall surface of the air supply / exhaust pipe T. As shown in FIG. 2C, the end portion of the discharge pipe 5 is closed by the closing plate 5c.

  As shown in FIGS. 2 (A) and 2 (B), the discharge pipe 5 has an overall L shape, and an L-shaped flow path having a continuous circular cross section is formed in the pipe of the discharge pipe 5. A plurality of compressed air injection ports 7 are formed in the tube wall of the discharge tube 5 at a predetermined interval. The injection ports 7 are aligned in the radial direction of the heat storage body H at the lowermost part of the lower surface of the discharge pipe 5. Each injection port 7 faces the supply-side end surface Ha of the heat storage body H (shown in phantom lines in FIGS. 2A, 2D, and 2E) and faces the supply-side end surface Ha. High-speed air jet J is injected. The air jet J blows through the narrow flow path Hc and flows out from the furnace side end face Hb to the furnace side of the heat storage body H. Dust, scale, etc. adhering to the cell partition are discharged to the furnace side by the air jet J.

  As shown in FIGS. 2 (A) and 2 (E), the drive injection port 8 opens on the side surface of the distal end portion of the discharge pipe 5. The injection port 8 injects a high-speed air jet G parallel to the supply side end face Ha in the vicinity of the outer peripheral portion of the supply side end face Ha. The air jet G is ejected in the circumferential direction or tangential direction of the heat storage body H at the outer peripheral portion of the air supply side end face Ha. A thrust (propulsive force) that moves the discharge pipe 5 in the direction opposite to the air jet G (direction of arrow R) acts on the discharge pipe 5 as a reaction of the air jet G, and the discharge pipe 5 has an arrow about the central axis X. Rotate in the R direction. The injection ports 7 and 8 may be formed in a nozzle form that slightly protrudes outward from the tube wall of the discharge tube 5.

  FIG. 3 is a longitudinal sectional view, a sectional view taken along line IV-IV, and a perspective view showing a modified example of the cleaning device 1.

  The cleaning apparatus 1 shown in FIG. 3 includes a discharge pipe 5 having a T shape as a whole. The discharge pipe 5 forms a continuous circular cross-section T-shaped channel in the pipe of the discharge pipe 5. The discharge pipe 5 has a vertical portion 5a rotatably supported by a bearing 6 and a pair of horizontal portions 5b extending in the radial direction horizontally from the lower end portion of the vertical portion 5a. The horizontal portion 5b is aligned in the diametrical direction. Similar to the discharge pipe 5 shown in FIGS. 1 and 2, a plurality of compressed air injection ports 7 are formed at predetermined intervals on the pipe wall of the horizontal portion 5b. The injection ports 7 are aligned in the radial direction of the heat storage body H at the lowermost part of the lower surface of the horizontal portion 5b. Each injection port 7 faces the supply-side end surface Ha of the heat storage body H and injects a high-speed air jet J to the supply-side end surface Ha, and the air jet J blows through the narrow channel Hc, and the cell partition wall Dust, scale, etc. adhering to the furnace are discharged to the furnace side.

  Similar to the discharge pipe 5 shown in FIG. 1 and FIG. 2, the driving injection port 8 opens on the side surface of the tip of each horizontal portion 5b. The pair of injection ports 8 are disposed at point-symmetrical positions with respect to the center axis X, and each injection port 8 is a high speed parallel to the supply side end surface Ha of the heat storage body H in the vicinity of the outer peripheral portion of the supply side end surface Ha. An air jet G is injected. The air jet G is ejected in the circumferential direction or tangential direction of the heat storage body H at the outer peripheral portion of the air supply side end face Ha. Since the thrust force that rotates the discharge pipe 5 in the direction of arrow R acts on the discharge pipe 5 as a reaction of the air jet G, the discharge pipe 5 rotates in the direction of arrow R about the central axis X.

  If desired, three or more horizontal portions 5b may be arranged radially with respect to the lower end of the vertical portion 5a. In each of the above-described embodiments, the trajectory of the rotating horizontal portion 5b covers the entire circular area of the air supply side end face Ha. That is, in the heat storage body H having a circular opening end face, the entire area of the heat storage body H is cleaned by setting the dimension from the center axis X to the tip of the horizontal portion 5b to be the same as or equal to the radius of the heat storage body H. can do. However, in a cleaning device that cleans a heat storage body having a square or rectangular opening end surface, the length of the horizontal portion 5b is diagonal so that the locus of the tip of the horizontal portion 5b completely includes the opening end surface of the heat storage body. It is desirable to set a considerable length.

  FIG. 4 is a longitudinal sectional view and a VV sectional view showing a further modified example of the cleaning device 1. FIG. 4 shows a supply / exhaust system of a combustion system in which a plurality of heat accumulators H are arranged in parallel in a pipe flow path P of the supply / exhaust pipe T.

  The cleaning device 1 shown in FIG. 4 has a configuration in which the L-shaped discharge pipes 5 shown in FIGS. 1 and 2 are arranged in parallel corresponding to the heat storage bodies H. Each discharge pipe 5 is connected to the branch pipes 3a and 3b of the compressed air supply pipe 3 through the rotary joint 4, and a high-speed air jet flows from the injection port 7 toward the supply side end face Ha of the heat storage body H. J is injected to discharge dust, scale, etc. adhering to the cell partition walls to the furnace side.

  Similar to the above-described embodiment, a thrust force that rotates each discharge pipe 5 in the direction of arrow R is obtained by the high-speed air jet G of the drive injection port 8. The cleaning device 1 shown in FIG. 4 further includes a link mechanism 9 that synchronizes the rotational movement of each discharge pipe 5. The link mechanism 9 includes a joint connecting portion 9b provided on the lower surface of the distal end portion of each discharge pipe 5, and a linear link member 9a connected to the joint connecting portion 9b. The left and right discharge pipes 5 are interconnected by a linear link member 9a. According to such a configuration, not only can each discharge pipe 5 be operated synchronously, but also the thrust of each discharge pipe 5 can be compensated mutually or leveled.

  FIG. 5 is a longitudinal sectional view showing a configuration of a regenerative alternating combustion system including the cleaning device 1 shown in FIG. FIG. 6 is a longitudinal sectional view showing the combustion system shown in FIG. 5 in a state after switching to the combustion mode. 7 is a cross-sectional view taken along line VI-VI in FIG.

  The combustion system shown in FIG. 5 includes a burner device 12 that penetrates the furnace wall 11, and first and second supply / exhaust systems 20 and 30 that are disposed on both sides of the burner device 12. A burner tile 14 of the burner device 12 is disposed on the refractory member 13 of the burner portion constituting the furnace wall 11. The heat storage unit 21, 31 of the first and second air supply / exhaust systems 20, 30 penetrates the refractory member 13 on both sides of the burner device 12.

  Each of the heat storage body units 21 and 31 includes a pair of heat storage bodies H and support tubes 22 and 32 that support the respective heat storage bodies H. The flange portions of the support tubes 22 and 32 are fixed to the metal support plate 15 disposed outside the furnace. The support tubes 22 and 32 extend toward the furnace region F and open to the furnace region F. The casings 23 and 33 of the cleaning device 1 are connected to the furnace outer ends of the support tubes 22 and 32. An air supply / exhaust pipe T including the air supply control valves 25 and 35 and the exhaust control valves 26 and 36 is connected to the casings 23 and 33. Further, the supply pipes 27 and 37 and the exhaust pipes 28 and 38 are connected to the supply / exhaust pipe T. The in-pipe flow path P of the supply / exhaust pipe T communicates with the in-pipe flow paths of the supply pipes 27 and 37 and the exhaust pipes 28 and 38 via the supply control valves 25 and 35 and the exhaust control valves 26 and 36, respectively.

  In the operating state of the combustion system shown in FIG. 5, the air supply control valve 25 and the exhaust control valve 36 are opened, and the air supply control valve 35 and the exhaust control valve 26 are closed. Is an air supply mode state, and the second air supply / exhaust system 30 is in an exhaust mode state. In this operating state, the combustion air A preheated by the heat storage unit 21 is supplied to the furnace region (combustion region) F, and the combustion exhaust gas in the furnace region F is exhausted through the heat storage unit 31.

  The combustion system executes the operation state shown in FIG. 5 for a predetermined time (for example, 30 seconds), then opens the air supply control valve 35 and the exhaust control valve 26 as shown in FIG. 6, and supplies the air supply control valve 25 and the exhaust gas. The control valve 36 is closed, whereby the first supply / exhaust system 20 is switched to the exhaust mode, and the second supply / exhaust system 30 is switched to the supply mode. In this operating state, the combustion air A preheated by the heat storage unit 31 is supplied to the furnace region F, and the combustion exhaust gas in the furnace region F is exhausted through the heat storage unit 21.

  When the regenerative alternating combustion operation in which the operation states shown in FIGS. 5 and 6 are alternately executed at predetermined time intervals (for example, 30 seconds) is completed and the operation of the combustion system is stopped, The cleaning device 1 is activated. The cleaning device 1 is controlled only by controlling high-pressure air (compressed air) supplied to the compressed air supply pipe 3. That is, when high-pressure air is supplied from the air compressor 2 to the feed pipe 3, each jet port 7 (FIG. 2) of the discharge pipe 5 has a high-speed air jet with respect to the supply-side end face Ha of the heat storage body H. J is injected, and the dust, scale, and the like in the cell holes are discharged to the in-furnace region F by the air jet J that blows through the narrow flow path Hc. At the same time, the driving injection port 8 (FIG. 2) of the discharge pipe 5 injects a high-speed air jet G, and the discharge pipe 5 rotates in the direction of arrow R. Since the adjacent discharge pipes 5 are interconnected by the link mechanism 9, they operate synchronously. Thus, the cell hole of the heat storage body H is cleaned by the air jet J over the entire area. When the operation of the air compressor 2 is stopped or the supply valve 3 is stopped by closing the control valve (not shown) of the feed pipe 3, the injection of the air jets J and G is stopped, and the cleaning device 1 Finishes the cleaning operation.

  The cleaning device 1 has a control device (not shown) that controls the jet pressure of the air jets J and G. The control device controls the operation of the air compressor 2 and also controls control valves (not shown) such as an electromagnetic valve and a pressure regulating valve interposed in the feed pipe 3, Supply or stop of supply and the fluid pressure of the high-pressure gas supplied to the discharge pipe 5 are controlled. When the operation of the combustion system is periodically stopped, the cleaning device 1 periodically performs a cleaning operation under the control of the control device. When the operation of the combustion system stops irregularly in accordance with the combustion operation process or the like, the control device executes the cleaning operation of the cleaning device 1 in association with the operation state of the combustion system.

  FIG. 8 is a perspective view showing still another modification of the cleaning device 1, and FIGS. 9 and 10 are a perspective view and a partial longitudinal sectional view of the discharge pipe 5 shown in FIG.

  The cleaning device 1 shown in FIGS. 8 to 10 has a pair of first horizontal portions 5b extending horizontally in the radial direction from the lower end portion of the vertical portion 5a, like the discharge pipe shown in FIG. A mouth 7 is formed at a predetermined interval in the tube wall of the first horizontal portion 5b. A pair of second horizontal portions 5d is disposed above the first horizontal portion 5b. The drive injection port 8 is formed in the side surface of the distal end portion of each second horizontal portion 5d.

  In the present example, the second horizontal portion 5d is disposed at an angular interval of 90 degrees with respect to the first horizontal portion 5b. Therefore, the first and second horizontal portions 5b and 5d are 90 degrees in plan view. Are arranged at equal intervals with an angular interval of. If desired, a single horizontal part 5b and a single horizontal part 5d are provided in the discharge pipe 5, or three or more horizontal parts 5b and three or more horizontal parts 5d are provided in the discharge pipe 5. May be. By separately forming the tubular body (first horizontal portion 5b) having the compressed air injection port 7 and the tubular body (second horizontal portion 5d) having the driving injection port 8, the driving injection is performed. The thrust of the discharge pipe 5 obtained by the port 8 can be adjusted or adjusted relatively easily.

  As shown in FIG. 10, the in-pipe area of the second horizontal portion 5d communicates with the in-pipe area of the vertical portion 5a. An adjustment throttle mechanism or orifice member 50 having a throttle channel 51 is disposed in the pipe inner region of the second horizontal portion 5d. The high-pressure air C supplied to the pipe inner region of the second horizontal portion 5 d is supplied to the driving injection port 8 through the throttle channel 51. The throttle channel 51 functions as a thrust adjusting means for adjusting the thrust for rotating the discharge pipe 5.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications or changes can be made within the scope of the present invention described in the claims. Is possible.

  For example, as the compressed air supply pipe and the compressed air discharge pipe, not only a circular cross-section pipe body but also a rectangular cross-section or polygonal cross-section pipe body may be used.

  The above embodiment relates to a supply / exhaust system in which the cell holes (honeycomb cells) of the heat storage body are oriented in the vertical direction. It is also possible to arrange the cleaning device of the present invention.

  Furthermore, although the said Example is related with the combustion system which has arrange | positioned the thermal storage body out of the burner apparatus, you may use the cleaning apparatus of this invention in the combustion system which has arrange | positioned or incorporated the thermal storage body in the burner apparatus.

  The present invention is preferably applied to a cleaning device and a cleaning method for cleaning a fixed honeycomb type heat storage body provided in a regenerative alternating combustion system or a supply airflow heating system. According to the cleaning device and the cleaning method of the present invention, the pressure loss of the supply air flow and the exhaust flow is not substantially increased, and the mechanical drive mechanism is not disposed in the supply / exhaust flow path, and is fixed. Since the cell holes of the honeycomb-type heat accumulator can be air purged to remove dust, scales and the like in the cell holes, its practical value is remarkable.

DESCRIPTION OF SYMBOLS 1 Cleaning apparatus 2 Air compressor 3 Compressed air supply pipe 4 Rotating joint 5 Compressed air discharge pipe 6 Bearing 7 Compressed air injection port (cleaning injection port)
8 Drive injection port 9 Link mechanism H Heat storage body Ha Supply side end face (low temperature side end face)
Hb Furnace side end face (High temperature side end face)
Hc Narrow channel (honeycomb cell)
P Pipe flow path T Supply / exhaust pipe F Furnace area A Combustion air E Combustion exhaust gas

Claims (14)

In the heat storage body cleaning device for cleaning the heat storage body of the honeycomb structure in which the combustion exhaust gas and the combustion air or the air supply fluid alternately flow through the cell holes,
A high-pressure gas supply source for supplying a high-pressure gas for cleaning the heat storage body;
A high-pressure gas feed pipe connected to the high-pressure gas supply source;
A discharge pipe connected to the feed pipe via a rotary joint;
A bearing that rotatably supports the discharge pipe around a rotation center axis substantially parallel to the axis of the heat storage body;
The rotary joint, bearing and discharge pipe are arranged in a supply / exhaust flow path for combustion exhaust gas and combustion air or supply fluid,
The discharge pipe includes a cleaning injection port for spraying a jet of high-pressure gas to the open end surface of the heat storage body, and a drive injection for injecting a jet of high-pressure gas in a direction substantially parallel to the open end surface of the heat storage body Having a mouth,
The heat storage body cleaning apparatus according to claim 1, wherein the discharge pipe is rotated about the rotation center axis by a thrust acting on the discharge pipe as a reaction of the driving jet.   The discharge pipe extends from the rotary joint from the rotary joint substantially parallel to the central axis of the heat storage body, extends from the first pipe part substantially parallel to the open end surface of the heat storage body, and The heat storage body cleaning device according to claim 1, further comprising: a second tubular portion including a cleaning injection port and a driving injection port.   The discharge pipe extends from the rotary joint substantially parallel to the central axis of the heat storage body, extends from the first pipe part substantially parallel to the open end surface of the heat storage body, and A second tubular portion provided with the cleaning injection port; and a third tubular portion extending from the first tubular portion in the upper region of the second tubular portion and provided with the driving injection port. The heat storage body cleaning apparatus according to claim 1.   The heat storage body cleaning device according to claim 3, wherein the third tubular body portion extends from the first tubular body portion substantially in parallel with an open end surface of the thermal storage body.   The heat storage body cleaning device according to claim 3 or 4, wherein a throttle mechanism for adjusting the thrust is disposed in an in-pipe region of the third tubular body portion.   The heat storage body cleaning device according to any one of claims 1 to 5, wherein the discharge pipes are provided for a plurality of heat storage bodies, and the discharge pipes are interconnected by a link mechanism. .   The control means for controlling the fluid pressure of the high-pressure gas supplied to the discharge pipe to control the injection pressure of the cleaning injection port and the thrust of the discharge pipe. The heat storage body cleaning apparatus of Claim 1.   The heat storage body is made of a ceramic honeycomb fixed to a supply / exhaust flow path, and the discharge pipe is disposed so as to blow a jet of high-pressure gas to a low temperature side open end surface of the heat storage body. Item 8. The heat storage body cleaning device according to any one of Items 1 to 7. In the heat storage body cleaning method for cleaning the heat storage body of the honeycomb structure in which the combustion exhaust gas and the combustion air or the supply fluid alternately flow through the cell holes,
A rotary joint, a bearing, and a discharge pipe are arranged in a supply / exhaust flow path for combustion exhaust gas and combustion air or supply air fluid, and the discharge pipe is rotatably supported by the bearing, and the rotary joint is inserted through the rotary joint. Connecting the discharge pipe to a high-pressure gas feed pipe,
A high-pressure gas from a high-pressure gas supply source is supplied to the feed pipe, and a high-speed jet for honeycomb cleaning is blown from the cleaning injection port of the discharge pipe to the open end face of the heat storage body, and substantially the open end face. A jet of driving in a parallel direction is jetted from a driving jet of the discharge pipe,
The dust or scale adhering to the cell partition walls of the heat storage body is discharged to the supply / exhaust flow channel on the opposite side by the high-speed jet for honeycomb cleaning, and the thrust acting on the discharge pipe as a reaction of the drive jet, The heat storage body cleaning method characterized by rotating a discharge pipe.   The heat storage body according to claim 9, wherein the jet pressure of the cleaning jet and the thrust of the discharge pipe are controlled by controlling the fluid pressure of the high-pressure gas supplied to the discharge pipe. Cleaning method.   The high-pressure gas is periodically supplied to the discharge pipe, or a control device is provided for supplying the high-pressure gas to the discharge pipe in connection with an operation of a combustion system or a supply air flow heating system. The heat storage body cleaning method according to claim 9 or 10.   The heat storage body cleaning method according to any one of claims 9 to 11, wherein high-pressure air or inert gas is used as the high-pressure gas.   The heat storage body cleaning method according to any one of claims 9 to 12, wherein dust or scale discharged to the supply / exhaust flow path is burned in a combustion region of a combustion system or a supply airflow heating system. The pressure adjusting mechanism is provided in a high-pressure gas flow path for supplying the high-pressure gas to the driving injection port, and the thrust acting on the discharge pipe is adjusted. The thermal storage body cleaning method of description.

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