JP4643385B2 - High temperature air flow generator - Google Patents

Description

  The present invention relates to a high-temperature airflow generation device, and more particularly to a high-temperature airflow generation device that heats a relatively low-temperature airflow to a high temperature by using a heat storage / heat dissipation action of a heat storage body.

  A high-temperature air flow generation device that generates a high-temperature air flow exceeding 700 ° C. is known from Japanese Patent Application No. 10-189 (Japanese Patent Application Laid-Open No. 10-246428) by the present applicant. This high-temperature airflow generator includes a combustion zone and a heat storage body arranged in series. The high-temperature combustion gas generated in the combustion zone is exhausted through the heat storage body, and the heat storage body is in heat transfer contact with the combustion gas to receive the sensible heat of the combustion gas and store the heat. Airflow of relatively low temperature air, inert gas, water vapor, or the like is introduced into the heat storage body housing region that houses the high temperature heat storage body after heat storage. The airflow is in heat transfer contact with the heat storage body, receives heat, is heated to a high temperature, and the heat storage body cools. The heated airflow flows out to the delivery path of the high-temperature airflow generation device via the combustion zone, and is supplied to other devices or devices via the delivery path.

  In this type of high-temperature airflow generator, a heating unit in which a heat accumulator and a combustion zone are arranged in series is arranged in a pair, and one heating unit exhausts the combustion gas in the combustion zone via the heat accumulating step (the heat accumulator). The other heating unit executes a heat radiation step (step of sending a low-temperature airflow to the high-temperature airflow delivery path via the heat storage body and the combustion zone). The process of each heating unit is switched alternately, and the heated airflow is sent from at least one heating unit to the high-temperature airflow delivery path.

Such a high-temperature airflow generator is also disclosed in Japanese Patent Application No. 2001-176379 (Japanese Patent Laid-Open No. 2002-364634) or Japanese Patent Application No. 2001-176380 (Japanese Patent Laid-Open No. 2002-364822) of the present applicant. ing.
Japanese Patent Laid-Open No. 10-246428 JP 2002-364834 A JP 2002-364822 A

  A conventional high-temperature airflow generator has a configuration in which a heat accumulator and a combustion zone are arranged in series, and a supply airflow passes through the flow path in a linear flow path form from the inlet portion of the heat accumulator to the outlet portion of the combustion zone. To flow. In the design of such a high-temperature air flow generator, the entire length of the high-temperature air flow generator must be designed to have a sufficient dimension that can secure a flow path in the form of a linear flow path, and the overall size of the apparatus increases. It was.

  Conventional high-temperature airflow generators also have a configuration in which a relatively large amount of fuel is injected into a limited volume combustion zone to cause a combustion reaction. When the volume of the combustion zone is limited, high-load combustion is combusted. The flame temperature tends to rise. Such a high-temperature flame tends to generate combustion exhaust gas having a relatively high nitrogen oxide (NOx) concentration. Under such circumstances, the conventional high-temperature airflow generator has a relatively large volume combustion area, and the size of the apparatus has been increased as a whole.

  Further, the conventional high-temperature airflow generator has a structure in which heating units formed by arranging a heat storage body and a combustion zone in series are arranged in parallel, and the combustion zone of each heating unit is separated by a heat-resistant partition. The While the combustion device in one combustion zone is in a combustion operation, the other combustion zone is used as a flow zone of the high-temperature air supply after heating. Since the combustion reaction proceeds alternately in the combustion zone of each unit, considerable thermal stress is generated in the partition walls, and cracks and the like due to thermal stress are likely to occur. According to the applicant's experiments, such cracks in the partition walls can cause leakage and mixing of high-temperature airflow and combustion gas between the combustion chambers. For example, under certain conditions, a non-combustible air current leaks into the combustion chamber during combustion, causing a disadvantage that the combustion reaction is inhibited.

  This invention is made | formed in view of such a subject, The place made into the objective is to provide the high temperature airflow generator which can be designed to a comparatively compact structure.

  Another object of the present invention is to provide a high-temperature airflow generator that can prevent an increase in the concentration of nitrogen oxides in exhaust gas caused by high-load combustion and can reduce the size of the device.

  It is another object of the present invention to provide a high-temperature air flow generator that can suppress thermal stress of the partition walls and prevent cracks in the partition walls.

In order to achieve the above object, the present invention provides a first combustion chamber provided with a first combustion device and a first heat storage device, a second combustion chamber provided with a second combustion device and a second heat storage device, In a high-temperature airflow generator having combustion device switching means for alternately performing combustion operation of the second combustion device and heat storage device switching means for switching each heat storage device to an exhaust state or a high-temperature airflow introduction state,
The combustion chamber has first and second end faces facing each other and a top face extending between the end faces, and the combustion device opens to the first end face, and fuel and combustion air, or combustion in the combustion chamber Gas is blown in, and the heat storage device opens to the second end face to exhaust the combustion gas in the combustion chamber, heats the gas to be heated, and blows it from the second end face to the combustion chamber as a high temperature air flow. Including
A high-temperature air flow generation device is provided, wherein a high-temperature air flow outlet for deriving the high-temperature air flow from the combustion chamber opens at the top surface.

  According to the above configuration of the present invention, the fuel and combustion air or combustion gas jetted from the combustion device at the first end face to the combustion chamber are exhausted via the heat storage device at the second end face, and the heat of the combustion gas is Heat is stored in the heat storage device. The high temperature airflow heated by the heat storage device is jetted from the second end face into the combustion chamber. Since the high-temperature air flow outlet opens at the top surface of the combustion chamber, the high-temperature air flow is led out from the combustion chamber in a direction that intersects the jet direction of the combustion device. Therefore, the distance between the first end face and the second end face may be set to a distance that allows the combustion reaction of the combustion chamber to proceed appropriately by the combustion device and the heat storage device. This is different from the conventional high-temperature air flow generation device that has been led out of the device without turning the high-temperature air flow, and allows the combustion chamber volume to be limited (and thus the device size of the high-temperature air flow generation device can be reduced). .

  In the high-temperature airflow generator having the above-described configuration, the present invention further includes a bypass flow path in which the gas to be heated is water vapor and a part of the high-temperature airflow introduced into one combustion chamber is supplied to the other combustion chamber. There is provided a high-temperature air flow generator characterized by the above.

  According to the above configuration of the present invention, high-temperature steam is supplied to the combustion chamber during combustion through the bypass flow path. Since the flame temperature in the combustion chamber is lowered by the addition of water vapor, the nitrogen oxide concentration in the combustion exhaust gas is lowered. Therefore, it is possible to reduce the volume of the combustion chamber and reduce the apparatus size while preventing an increase in the nitrogen oxide concentration.

  The present invention further provides a high-temperature air flow generation device having the above-described configuration, wherein a part of the combustion exhaust gas in the combustion chamber is added to the combustion air of the combustion device.

  According to the above configuration of the present invention, the combustion air of the combustion apparatus is diluted with the combustion exhaust gas. The flame temperature in the combustion chamber decreases and the nitrogen oxide concentration in the combustion exhaust gas decreases. Therefore, it is possible to reduce the volume of the combustion chamber and reduce the apparatus size while preventing an increase in the nitrogen oxide concentration.

  According to the present invention, in the high-temperature airflow generation device having the above-described configuration, a primary heating device constituting partition walls of the first and second combustion chambers is disposed between the first and second combustion chambers, and the primary heating device Has a heat transfer tube through which a gas to be heated or a liquid to be vaporized can flow, and the primary heating device conducts heat of combustion in the combustion chamber to the gas or the liquid in the heat transfer tube. And a high-temperature air flow generator characterized by having a structure in which the gas or liquid is heated.

  According to the above configuration of the present invention, the heat of the combustion chamber that has transferred heat to the partition walls between the combustion chambers is absorbed by the fluid flowing through the primary heating device. Therefore, the thermal stress of the partition wall can be suppressed and cracking of the partition wall can be prevented.

  According to the above configuration of the present invention in which the high-temperature air flow is turned and led out of the apparatus from the top surface of the combustion chamber, the high-temperature air flow generation device can be designed in a relatively compact structure.

  According to the above configuration of the present invention in which high temperature steam is supplied to the combustion chamber in the combustion state or a part of the combustion exhaust gas is added to the combustion air of the combustion apparatus, nitrogen oxides in the exhaust gas resulting from high load combustion The device size of the high-temperature airflow generation device can be reduced while preventing an increase in concentration.

  According to the said structure of this invention which has arrange | positioned the primary heating apparatus between the 1st and 2nd combustion chamber, the thermal stress of the partition of a high temperature airflow generator can be suppressed, and the crack of a partition can be prevented.

  Preferably, a high-temperature air flow chamber is disposed above the top wall, and the first and second flow paths extending upward from the high-temperature air flow outlets of the first and second combustion chambers penetrate the top wall of the combustion chamber. Open into the hot air flow chamber. The high temperature air flow in the first and second combustion chambers flows into the high temperature air flow chamber. The hot air flow chamber is connected to a hot air flow delivery pipe for supplying the hot air flow to a device or facility outside the system.

  More preferably, the first and second flow paths are inclined symmetrically so that the upper portions of the flow paths approach each other, and the hot air flow delivery pipe is located at the top of the hot air flow chamber in the middle of the first and second flow paths. Opened in the wall, the upper end opening of each flow path receives the high-temperature airflow discharged in the inclined direction.

  Preferably, a heat storage body having a honeycomb structure is disposed in the first and second flow paths. The high temperature air flow is discharged into the high temperature air flow chamber through a narrow flow path of the heat storage body. The honeycomb structure heat accumulator gives flow resistance to the first and second flow paths, prevents the high temperature air flow in the high temperature air flow chamber from flowing back to the combustion chamber during combustion, and stabilizes the temperature of the high temperature air flow. Act on.

  In a preferred embodiment of the present invention, the heat storage device comprises a heat storage unit including a ceramic heat storage body having a honeycomb structure and a supply / discharge switching valve device. The heat storage element constitutes a regenerator type heat exchanger with high temperature efficiency. The supply / exhaust switching valve device includes a supply / exhaust port that opens at the second end surface, an exhaust position that exhausts the combustion gas in the combustion chamber by communicating with an exhaust fan, a flow path of gas to be heated, and a supply / exhaust port. Are controlled to be switched to a high temperature air flow introduction position for introducing a high temperature air flow into the combustion chamber.

  According to a further preferred embodiment of the present invention, the central axis of the jet port of the combustion device that blows fuel and combustion air or combustion gas into the combustion chamber and the central axis of the supply and exhaust port of the heat storage device are mutually It is positioned at an eccentric position. The jet of the combustion device stays in the combustion chamber without short-passing to the supply / exhaust port, or forms a gas circulation flow in the furnace, and effectively advances the combustion reaction in the combustion chamber. This allows for a reduction in the distance between the first and second end faces, and thus a suitable reduction in the combustion chamber volume.

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

  FIG. 1 is a side view showing an embodiment of a high-temperature air flow generator according to the present invention.

  The high-temperature airflow generator 1 includes a heating furnace 2, a burner unit 3, a primary heating device 4, a heat storage unit 5, and an exhaust fan 7. A fuel supply pipe 31 and an air supply pipe 32 that supply hydrocarbon fuel and combustion air to the burner unit 3 are connected to the burner unit 3. The steam supply pipe 41 is connected to the inflow portion 42 of the primary heating device 4, and the pair of upper and lower steam relay tubes 44 are connected to the upper and lower outflow portions 43 of the primary heating device 4, respectively.

  The upper and lower relay pipes 44 are connected to the junction pipe 45, and the junction pipe 45 is connected to the water vapor supply port 51 of the heat storage unit 5. An exhaust pipe 71 is connected to the exhaust port 52 of the heat storage unit 5. The exhaust pipe 71 is connected to the suction port of the exhaust fan (or exhaust blower) 7. An exhaust pipe 72 is connected to the discharge port of the exhaust fan 7. A branch pipe 73 branches from the exhaust pipe 72 and is connected to the air supply pipe 32.

  The heating furnace 2 includes a high-temperature steam delivery unit 8. A high-temperature steam delivery pipe 81 is connected to the delivery section 8, and the delivery pipe 81 supplies high-temperature steam at 700 ° C. or higher to equipment or devices (not shown) outside the system.

  Control valves 33, 34, and 74 are interposed in the supply pipes 31 and 32 and the branch pipe 73, respectively. Each drive part of the control valves 33, 34 and 74 is connected to the control unit 9 via a control signal line (shown by a broken line). The valve drive device 62 of the heat storage unit 5 is connected to the control unit 9 via a control signal line. The control unit 9 drives the control valves 33, 34, 74 and the valve driving device 62, and controls the operation of the high temperature airflow generation device 1.

  FIG. 2 is a cross-sectional view of the high-temperature airflow generator 1 taken along the line II-II in FIG. 3, 4, 5, and 6 are cross-sectional views of the high-temperature airflow generation device 1 taken along lines III-III, IV-IV, VV, and VI-VI shown in FIG. 2. 7 and 8 are longitudinal sectional views showing the structure of the heat storage unit 5.

  As shown in FIGS. 2 and 3, the heating furnace 2 includes a pair of left and right combustion chambers 21. Each combustion chamber 21 is partitioned by a refractory wall 22 that forms a furnace inner wall surface. The outer surface of the fire wall 22 is covered with a relatively hard heat insulating material 23. The primary heating device 4 is disposed on the central axis CL (FIG. 2) of the heating furnace 2. As shown in FIG. 3, the heating furnace 2 has a symmetrical structure and configuration with respect to the vertical center plane CP, and the primary heating device 4 divides the heating furnace 2 on the vertical center plane CP.

  Each combustion chamber 21 has a rectangular parallelepiped outline, and the burner unit 3 and the heat storage unit 5 are disposed on end surfaces 21a and 21b (FIG. 2) of each combustion chamber 21, respectively.

  The jet port 36 of the burner unit 3 opens in the end surface 21 a, and the burner throat portion 35 of the burner unit 3 penetrates the fire wall 22 and the heat insulating material 23. The burner throat portion 35 is oriented parallel to the central axis CL, and the injection port 36 discharges the mixture of fuel and combustion air to the combustion chamber 21 parallel to the central axis CL.

  The base end portion of the burner unit 3 protrudes outside the furnace, and a mixing portion 37 that mixes fuel and combustion air is disposed in the out-furnace protruding portion of the burner unit 3. The fuel supply pipe 31 and the combustion air supply pipe 32 are connected to the mixing unit 37, and hydrocarbon fuel and combustion air are supplied to the mixing unit 37 under the control of the control valves 33 and 34. The fuel / air mixture is injected into the combustion chamber 21 from the injection port 36, and a flame F is generated in the combustion chamber 21. Note that the burner unit 3 includes ancillary equipment (not shown) such as a pilot burner, but the ancillary equipment of the burner unit 3 has a conventional structure, and a description thereof will be omitted.

  The supply / discharge port 57 of the heat storage unit 5 opens in the end surface 21b. The heat storage device 53 of the heat storage unit 5 penetrates the fire wall 22 and the heat insulating material 23. The heat storage unit 5 is oriented parallel to the central axis CL, and the supply / discharge port 57 discharges the heated water vapor to the combustion chamber 21 parallel to the central axis CL. The supply / discharge switching valve device 60 of the heat storage unit 5 protrudes outside the furnace. As described above, the merging pipe 45 and the exhaust pipe 71 are connected to the ports 51 and 52 of the supply / discharge switching valve device 60.

  The paired burner units 3 perform combustion operation alternately, and the combustion gas in the combustion chamber 21 on the combustion operation side (first combustion chamber 21-1 shown in FIGS. 2 to 5) Exhausted from. On the other hand, the heat storage unit 5 disposed in the combustion chamber 21 on the combustion stop side (second combustion chamber 21-2 shown in FIGS. 2 to 5) burns high-temperature steam heated by the heat storage device 53 from the supply / exhaust port 57. Inject into the chamber 21.

  7 and 8 show the structure of each heat storage unit 5. The heat storage device 53 and the supply / discharge switching valve device 60 are configured. The heat storage device 53 has a structure in which a heat storage body 56 is accommodated in a heat storage body case 55. The heat storage body 56 is made of a ceramic heat storage body having a honeycomb structure having a cylindrical outer shape, and has a large number of narrow flow paths. Each flow path of the heat storage body 56 penetrates the heat storage body 56 in the axial direction of the heat storage unit 5. The heat storage body 56 constitutes a regenerator type heat exchanger and exhibits a temperature efficiency of 0.9 or more. The structure of this type of heat exchanger is disclosed in detail in, for example, Japanese Patent Application No. 5-6911 (Japanese Patent Laid-Open No. 6-213585) by the applicant of the present application, and further detailed description is omitted. To do.

  The heat storage body case 55 is made of a metal or ceramic cylindrical member that penetrates the fire wall 22 and the heat insulating material 23, and is integrally supported by the fire wall 22. The front end portion of the heat storage body case 55 slightly protrudes from the front end surface of the heat storage body 56 to the in-furnace region, and is slightly reduced in diameter and opened to the combustion chamber 21. The circular opening at the front end of the heat storage body case 55 constitutes a supply / exhaust port 57. The supply / exhaust port 57 functions as an in-furnace gas suction port for sucking the in-furnace gas in the combustion chamber 21 and also functions as a high-temperature steam injection port for injecting heated steam into the combustion chamber 21.

  The supply / discharge switching valve device 60 is aligned coaxially with the heat storage device 53 and projects out of the furnace from the heat insulating material 23. The valve device 60 includes a valve mechanism 61 and a valve drive device 62. The valve drive device 62 drives the valve mechanism 61 under the control of the control unit 9 and switches the valve mechanism 61 to the exhaust position or the water vapor introduction position. The valve mechanism 61 functions as a two-position control valve that selectively opens and closes the water vapor supply port 51 and the exhaust port 52.

  FIG. 7 shows the exhaust position of the valve mechanism 61, and the suction pressure of the exhaust fan 7 acts on the supply / exhaust port 57 via the exhaust pipe 71, the valve device 60 and the heat storage device 53. At the exhaust position of the valve mechanism 61, the combustion exhaust gas in the combustion chamber 21 flows into the flow path of the heat storage body 56 from the supply / exhaust port 57 by the suction pressure of the exhaust fan 7 and is exhausted outside the furnace via the valve mechanism 61. . In FIG. 8, the water vapor introduction position of the valve mechanism 61 is shown, and the water vapor pressure of the merging pipe 45 acts on the supply / discharge port 57 via the valve device 60 and the heat storage device 53. At the supply position of the valve mechanism 61, high-temperature steam heated by the heat storage body 56 is jetted from the supply / exhaust port 57 to the combustion chamber 21.

  FIG. 7B shows the structure of the supply / discharge switching valve device 60.

  The valve mechanism 61 includes a valve body 65, a supply / discharge pipe 66, an elbow pipe 67, and a valve seat portion 68. The elbow pipe 67 communicates with the exhaust port 52. An opening 69 of the elbow pipe 67 opens into the in-pipe area 69 of the supply / discharge pipe 66. The valve opening of the valve seat portion 68 faces the opening portion 69.

  The valve drive device 62 includes a drive unit (actuator) having a piston rod 64 and a valve housing 63 having a water vapor supply port 51. The piston rod 64 passes through the opening of the valve seat 68. A valve body 65 is fixed to the tip of the piston rod 64.

  In the exhaust position of the valve mechanism 61 shown in FIG. 7, the valve driving device 62 draws the piston rod 64 into the valve housing 63, and the valve body 65 is seated on the valve seat portion 68. The valve opening of the valve seat 68 is closed, and the opening 69 of the elbow pipe 67 is opened. By opening the opening 69, the exhaust port 52 and the in-pipe region 69 communicate with each other. The water vapor supply port 51 is closed by closing the valve opening of the valve seat 68.

  On the other hand, the valve drive device 62 extends the piston rod 64 at the water vapor introduction position of the valve mechanism 61 shown in FIG. The valve body 65 closes the opening 69 of the elbow pipe 67 and opens the valve opening of the valve seat 68. By closing the opening 69, the exhaust port 52 is closed. By opening the valve opening of the valve seat 68, the water vapor supply port 51 and the in-pipe region 69 communicate with each other.

  As shown in FIGS. 3 to 5, the water vapor channel 24 opens to the top surface 21 c of each combustion chamber 21. The flow path 24 vertically penetrates the fire wall 22 and communicates with the lower end portion of the heat storage body 25. The heat storage body 25 is inclined upward and inward so that the upper end portion thereof approaches the vertical center plane CP. Similar to the above-described heat storage body 56, the heat storage body 25 is made of a ceramic heat storage body of a honeycomb structure having a cylindrical outer shape, and has a large number of narrow flow paths. The heat storage body 25 is accommodated in a metal heat storage body case 26. The front end portion of the heat accumulator case 26 extends into the water vapor chamber 80 of the high temperature water vapor delivery unit 8, and is slightly reduced in diameter and opened to the water vapor chamber 80. Therefore, the open end of each narrow channel exposed at the upper end surface of the heat storage body 25 is opened to the water vapor chamber 80.

  The high-temperature water vapor delivery part 8 is formed by the heat insulating material 23, and the water vapor chamber 80 is partitioned into a rectangular parallelepiped outline. A high temperature steam outlet 82 is formed in the top wall of the steam chamber 80. The delivery port 82 is connected to the high temperature steam delivery pipe 81.

  As shown in FIGS. 3 and 6, the primary heating device 4 is disposed so as to separate the left and right combustion chambers 21 in the vertical center plane CP. The primary heating device 4 includes an inflow portion 42 (FIG. 6) disposed at the height center of the heating furnace 2, a vertically symmetric heat transfer tube 47 branched from the inflow portion 42, and a metal vertical tube in which the heat transfer tube 47 is embedded. The wall 48 and the upper and lower outflow portions 43 formed of the end portions of the heat transfer tubes 47 are configured. As described above, the water vapor supply pipe 41 is connected to the inflow portion 42, and the water vapor relay pipe 44 is connected to the outflow portion 43. The heat transfer tube 47 is piped in the vertical wall 48 in the form of a U tube. The U-shaped tube portion and the outflow portion 43 of the heat transfer tube 47 protrude from the end surface of the vertical wall 48.

  The saturated water vapor that has flowed into the inflow part 42 flows through the heat transfer pipe 47 and flows out from the outflow part 43 to the relay pipe 44. In FIG. 3, the combustion heat in the combustion chamber 21 (first combustion chamber 21-1) during the combustion operation is transferred to the heat transfer tube 47 through the refractory wall 22 and the vertical wall 48. The saturated water vapor in the heat transfer pipe 47 receives the heat conducted to the heat transfer pipe 47 and is heated, for example, flows out to the relay pipe 44 as superheated steam having a temperature of 150 to 200 ° C., and is joined to the heat storage unit 5 by the junction pipe 45. It is supplied to the water vapor supply port 51.

  As shown in FIG. 3, the heating furnace 2 further includes a bypass passage 85 that allows the left and right combustion chambers 2 to communicate with each other. The channel end of the bypass channel 85 opens to the bottom surface 21 d of the combustion chamber 2. The bypass passage 85 penetrates the fire wall 22 or penetrates the fire wall 22 and the heat insulating material 23. Part of the high-temperature steam that has flowed into the combustion chamber 21 (second combustion chamber 21-2) that has stopped combustion enters the combustion chamber 21 (first combustion chamber 21-1) that is in the combustion operation via the bypass passage 85. Inflow.

  As shown in FIGS. 3 to 5, the central axis C <b> 1 of the burner unit 3 and the central axis C <b> 2 of the heat storage unit 5 are arranged at positions offset from each other in the horizontal direction (horizontal direction) and the vertical direction (vertical direction). . Therefore, the fuel and combustion air injected by the burner unit 3 stay in the combustion chamber 2 (first combustion chamber 21-1) without being short-passed to the supply / discharge port 57 of the heat storage unit 5, or circulate in the furnace. The flame F is formed.

  Next, the operation of the high-temperature airflow generator 1 will be described.

  The burner units 3 arranged in the left and right combustion chambers 21 are alternately operated without being simultaneously operated. In the combustion chamber 21 in which the burner unit 3 is combusted, the valve mechanism 61 of the heat storage unit 5 is held at the exhaust position, and the heat storage unit 5 is used as exhaust means. On the other hand, in the combustion chamber 21 on the side where the burner unit 3 is stopped, the valve mechanism 61 is held at the steam introduction position, and the heat storage unit 5 is used as a steam heating means for heating the steam.

  2 to 5, the burner unit 3 disposed in the first combustion chamber 21-1 is a mixture of hydrocarbon fuel and combustion air in the first combustion chamber 21. -1 to generate a flame F in the first combustion chamber 21-1. The combustion gas in the first combustion chamber 21-1 is exhausted via the heat storage device 53 in the first combustion chamber 21-1. The combustion gas cools in heat transfer contact with the heat storage body 56. The heat storage body 53 receives sensible heat held by the combustion gas and is heated to a high temperature, and stores the sensible heat of the combustion gas. The cooled combustion gas is exhausted as combustion exhaust gas by the exhaust pipe 71, the exhaust fan 7 and the exhaust pipe 72. A part of the combustion exhaust gas is added to the combustion air in the air supply pipe 32 by the branch pipe 73 and the control valve 74. Combustion air is diluted with combustion exhaust gas. While the flame temperature of the flame F falls, the nitrogen oxide (NOx) density | concentration of the combustion gas produced | generated in the 1st combustion chamber 21-1 falls.

  On the other hand, the burner unit 3 arranged in the second combustion chamber 21-2 has stopped the combustion operation, and the heat storage body 56 of the second combustion chamber 21-2 is the second combustion chamber 21-2 executed immediately before. Heat is already stored by the burner unit combustion operation. The steam primarily heated by the primary heating device 4 is supplied to the second combustion chamber 21-2 through the heat storage device 53. The water vapor is in heat transfer contact with the heat storage body 56 and is heated to a high temperature of 700 ° C. or higher. The heated high-temperature steam is jetted from the supply / exhaust port 57 to the second combustion chamber 21-2.

  The jet of high-temperature steam collides with the end face 21a of the second combustion chamber 21-2, and then is sent to the high-temperature steam delivery pipe 81 through the steam flow path 24, the heat storage body 25, the steam chamber 80, and the high-temperature steam delivery port 82. , Supplied to equipment outside the system.

  A part of the high-temperature steam supplied to the second combustion chamber 21-2 flows into the first combustion chamber 21-1 via the bypass pipe 85. The high-temperature steam at 700 ° C. or higher lowers the flame temperature of the flame F without hindering the combustion reaction of the first combustion chamber 21-1, and also generates nitrogen oxides of combustion gas generated in the first combustion chamber 21-1 ( NOx) acts to reduce the concentration.

  The control unit 9 combusts the burner unit 3 in the first combustion chamber 21-1, and continues the operation of the high-temperature airflow generator 1 that supplies high-temperature steam by the heat storage unit 5 in the second combustion chamber 21-2 for a predetermined time. Thereafter, the control valves 33, 34, 74 and the valve driving device 62 are driven substantially simultaneously to switch the operation of the high-temperature air flow generator 1. As a result, the high-temperature airflow generation device 1 performs the combustion operation of the burner unit 3 in the second combustion chamber 21-2 and shifts to an operation state in which the water vapor is heated by the heat storage unit 5 in the first combustion chamber 21-1.

  The operating state of such a high-temperature airflow generator 1 is shown in FIGS.

  As shown in FIGS. 9 to 12, the burner unit 3 disposed in the second combustion chamber 21-2 injects a mixture of fuel and combustion air into the second combustion chamber 21-2, and the second combustion chamber 21. -2 creates a flame F. The combustion gas in the second combustion chamber 21-2 is exhausted through the heat storage device 53 in the first combustion chamber 21-1. The combustion gas is cooled by heat transfer contact with the heat storage body 56, and the heat storage body 53 stores the sensible heat of the combustion gas. The cooled combustion gas is exhausted as combustion exhaust gas by the exhaust pipe 71, the exhaust fan 7 and the exhaust pipe 72. A part of the combustion exhaust gas is added to the combustion air in the air supply pipe 32 via the branch pipe 73 and the control valve 74. Combustion air is diluted with combustion exhaust gas. The flame temperature of the flame F falls and the nitrogen oxide (NOx) density | concentration of the combustion gas produced | generated in the 2nd combustion chamber 21-2 falls.

  The burner unit 3 arranged in the first combustion chamber 21-1 has stopped the combustion operation, and the heat storage body 56 of the first combustion chamber 21-1 has burned in the first combustion chamber 21-1 performed immediately before. It has already stored heat by driving. The steam primarily heated by the primary heating device 4 is supplied to the first combustion chamber 21-1 through the heat storage device 53. The water vapor is in heat transfer contact with the heat storage body 56 and heated to a high temperature of 700 ° C. or higher, and the heated high temperature water vapor is jetted from the supply / exhaust port 57 to the first combustion chamber 21-1.

  The jet of the high-temperature steam collides with the end surface 21a of the first combustion chamber 21-1, and then is sent to the high-temperature steam delivery pipe 81 through the steam flow path 24, the heat storage body 25, the steam chamber 80, and the high-temperature steam delivery port 82. The

  A part of the high-temperature steam supplied to the first combustion chamber 21-1 flows into the second combustion chamber 21-2 via the bypass pipe 85. High-temperature steam at 700 ° C. or higher lowers the flame temperature of the flame F without hindering the combustion reaction in the second combustion chamber 21-2, and nitrogen oxides of combustion gas generated in the second combustion chamber 21-2 ( NOx) acts to reduce the concentration.

  The high temperature airflow generation device 1 switches the operation of the high temperature airflow generation device 1 by driving the control valves 33, 34, 46 and the valve drive device 62 after continuing the operation state shown in FIGS. 9 to 12 for a predetermined time. The high-temperature air flow generation device 1 alternately executes such two forms of operation under the control of the control unit 9, continuously sends high-temperature steam at 700 ° C. or higher to the high-temperature steam delivery pipe 81, and installs equipment outside the system. Continuous supply to equipment.

  7 and 8, that is, the temperature Ti of the combustion gas in the combustion chamber 21, the temperature To of the high-temperature steam after heating, the combustion exhaust gas temperature T 1 (exhaust pipe 71), and the temperature T 2 of the superheated steam after primary heating. The (merging pipe 45) is set as follows, for example.

Combustion gas temperature Ti: Ti = 1200-1400 ° C.
High-temperature steam temperature To: To = 1100 to 1300 ° C.
Combustion exhaust gas temperature T1: T1 = 200 to 250 ° C.
Superheated steam temperature T2: T2 = 150 to 200 ° C.

  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. Needless to say, such variations and modifications are also included in the scope of the present invention.

  For example, in the above-described embodiment, the high-temperature air flow generation device is configured to primarily heat saturated steam by the primary heating device, but supplies water or pure water to the primary heating device and primarily heats the water or pure water. You may comprise a high temperature airflow generator so that it may vaporize by an apparatus.

  Moreover, although the high temperature air flow generator was illustrated as a high temperature water vapor flow generator that generates high temperature water vapor at 700 ° C. or higher, the high temperature air flow generator is configured as a device that heats other gases such as inert gas or air to a high temperature. Alternatively, the high-temperature airflow generation device of the present invention may be configured as a device that heats a mixture of water vapor and hydrocarbon (or carbon) to generate synthesis gas containing hydrogen or other components, water gas, or the like. good.

  The present invention uses a substantially direct heat exchange between a combustion gas and a gas made through a heat storage body to heat a gas such as a relatively low temperature water vapor, air, inert gas, etc. to a high temperature. Applies to generator. The present invention provides a relatively compact high temperature airflow generator. The present invention also enables downsizing of the high-temperature air flow generator without increasing the concentration of nitrogen oxides in the combustion exhaust gas exhausted from the combustion chamber of the high-temperature air flow generator, and generates cracks in the partition walls between the combustion chambers. It is possible to prevent such as. Therefore, this invention is advantageous when expanding the use or application range of a high temperature airflow generator.

It is a side view which shows the Example of the high temperature airflow generator which concerns on this invention. It is sectional drawing of the high temperature airflow generator in the II-II line | wire of FIG. 1, and the state which carried out the combustion operation of the burner unit of a 1st combustion chamber is shown. It is sectional drawing of the high temperature airflow generator in the III-III line | wire of FIG. 2, and the state which carried out the combustion operation of the burner unit of a 1st combustion chamber is shown. It is sectional drawing of the high temperature airflow generator in the IV-IV line | wire of FIG. 2, and the state which carried out the combustion operation of the burner unit of a 1st combustion chamber is shown. It is sectional drawing of the high temperature airflow generator in the VV line | wire of FIG. 2, and the state which supplies high temperature steam to a 2nd combustion chamber is shown. It is sectional drawing of the high temperature airflow generator in the VI-VI line of FIG. 2, and the state which carried out the combustion operation of the burner unit of a 1st combustion chamber is shown. It is a longitudinal cross-sectional view which shows the structure of a thermal storage unit, and the action | operation of the thermal storage unit of an exhaust process is shown. It is a longitudinal cross-sectional view which shows the structure of a thermal storage unit, and the action | operation of the thermal storage unit of a water vapor | steam heating process is shown. It is sectional drawing of the high temperature airflow generator in the II-II line | wire of FIG. 1, and the state which operated the burner unit of the 2nd combustion chamber is shown. It is sectional drawing similar to FIG. 3 which shows the state which carried out the combustion operation of the burner unit of a 2nd combustion chamber. It is sectional drawing which shows the state which supplies high temperature steam to a 1st combustion chamber. It is sectional drawing which shows the state which carried out the combustion operation of the burner unit of a 2nd combustion chamber.

Explanation of symbols

1: High-temperature air flow generator 2: Heating furnace 3: Burner unit 4: Primary heating device 5: Heat storage unit 7: Exhaust fan 9: Control unit 21: Combustion chamber 21-1: First combustion chamber 21-2: Second combustion Chamber 22: Fireproof wall 23: Heat insulating material 31: Fuel supply pipe 32: Air supply pipe 35: Burner throat part 36: Injection port 51: Water vapor supply port 52: Exhaust port 53: Heat storage device 56: Heat storage body 57: Supply / exhaust port 60: Supply / discharge switching valve device 62: Valve drive device F: Flame

Claims (9)

Combustion in which the first combustion chamber provided with the first combustion device and the first heat storage device, the second combustion chamber provided with the second combustion device and the second heat storage device, and the first and second combustion devices are operated alternately. In the high-temperature airflow generator having the device switching means and the heat storage device switching means for switching each heat storage device to the exhaust state or the high-temperature airflow introduction state,
The combustion chamber has first and second end faces facing each other and a top face extending between the end faces, and the combustion device opens to the first end face, and fuel and combustion air, or combustion in the combustion chamber Gas is blown in, and the heat storage device opens to the second end face to exhaust the combustion gas in the combustion chamber, heats the gas to be heated, and blows it from the second end face to the combustion chamber as a high temperature air flow. Including
A high-temperature air flow generation device, wherein a high-temperature air flow outlet for deriving the high-temperature air flow from the combustion chamber opens at the top surface.   2. The high temperature according to claim 1, further comprising a bypass flow path for supplying a part of the high-temperature air flow introduced into one combustion chamber to the other combustion chamber. Airflow generator.   3. The high-temperature air flow generation device according to claim 1, wherein a part of the combustion exhaust gas in the combustion chamber is added to the combustion air of the combustion device.   A primary heating device constituting partition walls of the first and second combustion chambers is disposed between the first and second combustion chambers, and the primary heating device is a gas to be heated or a liquid to be vaporized as the gas. The primary heating device has a structure in which the combustion heat in the combustion chamber conducts heat to the gas or liquid in the heat transfer tube and the gas or liquid is heated. The high-temperature airflow generator according to any one of claims 1 to 3.   A high-temperature air flow chamber is disposed above the top wall, and first and second flow paths extending upward from the high-temperature air flow outlet of the first and second combustion chambers penetrate the top wall of the combustion chamber; 5. The high-temperature air flow chamber opens to a high-temperature air flow chamber, and is connected to a high-temperature air flow delivery pipe that supplies the high-temperature air flow to a device or equipment outside the system. The high-temperature airflow generator according to Item.   The first and second flow paths are symmetrically inclined so that the upper portions of the flow paths approach each other, and the hot air flow delivery pipe is located between the first and second flow paths and the top wall of the hot air flow chamber The high-temperature airflow generation device according to claim 5, wherein the high-temperature airflow is received at the upper end opening of each flow path and is discharged in an inclined direction.   The honeycomb structure heat storage body is disposed in the first and second flow paths, and the high-temperature air flow is discharged into a high-temperature air flow chamber through a narrow flow path of the heat storage body. The high-temperature airflow generator described.   The heat storage device includes a heat storage unit including a ceramic structure heat storage body having a honeycomb structure and a supply / discharge switching valve device, and the heat storage body constitutes a regenerator type heat exchanger, and the supply / discharge switching valve device is The exhaust port that opens to the second end surface and the exhaust fan communicate with each other, the exhaust position for exhausting the combustion gas in the combustion chamber, the flow path of the gas to be heated, and the supply and exhaust port communicate with each other. The high-temperature airflow generation device according to any one of claims 1 to 7, wherein the high-temperature airflow generation device is controlled to be switched to a high-temperature airflow introduction position for introducing the high-temperature airflow into the combustion chamber.   The central axis of the jet port of the combustion device that blows the fuel and combustion air or combustion gas into the combustion chamber and the central axis of the supply / discharge port of the heat storage device are positioned at eccentric positions. The high-temperature airflow generation device according to any one of claims 1 to 8, wherein

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