WO1998038459A1 - Four de chauffage pour fluide - Google Patents
Four de chauffage pour fluide Download PDFInfo
- Publication number
- WO1998038459A1 WO1998038459A1 PCT/JP1998/000611 JP9800611W WO9838459A1 WO 1998038459 A1 WO1998038459 A1 WO 1998038459A1 JP 9800611 W JP9800611 W JP 9800611W WO 9838459 A1 WO9838459 A1 WO 9838459A1
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- WO
- WIPO (PCT)
- Prior art keywords
- combustion
- furnace
- heating furnace
- heat
- exhaust gas
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the present invention relates to a fluid heating furnace, and more specifically, heats or preheats combustion air to a high temperature by a direct heat exchange effect between combustion exhaust gas and combustion air performed through a heat storage body. It relates to a fluid heating furnace equipped with a regenerative combustion air high-temperature preheating function.
- tube-shaped heating furnaces in which heating tubes are arranged in a furnace area of a rectangular parallelepiped or box-shaped heating furnace or a heating furnace of an upright cylindrical shape are widely used for practical use.
- a heating furnace a plurality of burners are arranged on a ceiling wall or a top wall, or a floor surface wall or a bottom wall of the heating furnace body, and are generated by a combustion reaction of a combustion fuel or a hydrocarbon-based fuel supplied to each burner.
- Heating furnace main body a single heating tube row composed of multiple upright heating tubes is arranged and aligned on the center line of the left and right furnace walls, and multiple radial burners are dispersedly arranged on the furnace wall
- various types of heating furnaces such as a so-called terraced wall heating furnace, which raises fire and combustion gas along the inner wall of the furnace wall of the heating furnace body, are known. ing.
- such a heating furnace is provided with a structure for heating a heated pipe mainly by a heating means b disposed on a furnace wall or a heat radiation or radiant heat transfer action of a combustion device o.
- the flue gas generated by the combustion operation of the burner and heating the heated tube still has a large amount of sensible heat that can be used effectively. Therefore, the exhaust heat recovery unit integrated in the upper area of the heating furnace main body, or a separate exhaust heat recovery device connected to the heating furnace main body via a flue, etc. Is additionally provided in the heating furnace as an auxiliary equipment for the heating furnace.
- the temperature of the combustion exhaust gas introduced into the exhaust heat recovery section depends on the temperature conditions of the fluid to be heated introduced into the heated pipe, the heat load conditions of the heating furnace, and the like.
- flue gas still typically has a high temperature of 700 ° C. to 110 ° C. Therefore, in order to effectively use the waste heat possessed by the flue gas, preheating or heating the fluid to be supplied to the heating furnace, preheating the combustion air to be supplied to the burner, or steam
- waste heat recovery devices such as a heat exchange device or a waste heat recovery boiler for the purpose of generating or overheating, etc., are generally provided in the exhaust heat recovery unit.
- the conventional heating furnace about 35% to 55% of the heat or enthalpy input to the heating furnace is supplied to the waste heat recovery unit.
- an excessive amount of heat compared to the amount of heat consumed effectively for heating the fluid to be heated itself is supplied to a waste heat recovery device different from the intended purpose of using the heat input to the heating furnace. .
- the thermal efficiency of the heating furnace is reduced as a whole, and the heat balance efficiency of the heating furnace, which can effectively and effectively utilize the heat input to the heating furnace, is hardly achieved.
- burners having a combustion air preheating function have been proposed, and application of the burner to general heating furnaces has been studied.
- the burner portion of the heating furnace of the above can be replaced with a high-period or fast-switching regenerative combustion device having a high-temperature preheating function for combustion air.
- the sensible heat retained by the combustion exhaust gas in the furnace region is a honeycomb-structured ceramic regenerator constituting the high-cycle switching type regenerative combustion device.
- the heat is stored in the heat storage body, and the amount of heat stored in the heat storage body is radiated to the combustion air by the heat transfer contact between the subsequent combustion air flow and the heat storage body, and the combustion air is heated to 800 ° C or more. Heat to high temperature.
- the combustion exhaust gas made via the heat storage The sensible heat possessed by the flue gas can be effectively transferred to the combustion air flow by the direct heat exchange between the air and the combustion air, thus reducing the heat capacity or heat exchange capacity of the waste heat recovery section.
- auxiliary equipment such as a waste heat recovery device can be omitted or reduced in size.
- the application of the high-period switching regenerative combustion system to a conventional heating furnace achieves high efficiency of the heating furnace body by transferring the sensible heat of the combustion exhaust gas to the combustion air supply flow. It is merely intended to allow for further improvement or room for improvement.
- the combustion flue gas in the furnace is increased by about 10% due to the hydrocarbon fuel fluid introduced into the furnace, and the specific heat of the carbon dioxide gas and steam constituting the combustion gas in the furnace is high temperature atmosphere. Gradually increase.
- the in-furnace flue gas has sensible heat that exceeds the heat balance of the regenerator, and as a result, high-temperature flue gas that still retains the amount of heat that can recover waste heat passes through the regenerator. It will be exhausted. Therefore, it is desirable to take measures to further utilize the excess sensible heat of the combustion exhaust gas that exceeds the amount of sensible heat required for preheating the combustion air supply flow.
- the combustion supply air flow preheated to a high temperature by the high-cycle switching regenerative combustion system blows into the furnace area as a high-speed air flow exceeding 50 to 8 Om / sec or a high-speed flow exceeding the blow-off limit of fire.
- the high-speed high-temperature supply air flow can be heated, but depending on the arrangement of the heated pipes, the heated pipe section near the discharge port of the combustion supply air is locally heated to a high temperature, and the heated inside the furnace is heated.
- the present invention is not desirable in order to realize a uniform temperature distribution of the heated pipe or a desired temperature gradient in the axial direction of the heated pipe because the outside atmosphere of the pipe can be uneven.
- the objective is to make effective use of the characteristics or characteristics of a high-period or high-speed switching type thermal storage combustion system with a high-temperature preheating function for combustion air, and to achieve an economy that can exhibit high overall thermal efficiency.
- Target and con An object of the present invention is to realize a heating furnace having a compact structure. Disclosure of the invention
- a combustion device that generates and maintains the combustion of a fuel fluid by using high-temperature, especially combustion air preheated to a high temperature of 800 ° C or higher.
- combustion reaction of it has a dominant effect on the heat transfer phenomenon of the heated pipe The fact that bright flames are not sufficiently generated in the combustion zone, and non-flame flames are mainly generated in the furnace as a flame that substantially controls the heating action.
- Heat can be obtained mainly by the heat radiation of water vapor and carbon dioxide gas in the high-temperature combustion gas, and the combustion air preheated to a high temperature by a combustion device having a combustion air high-temperature preheating function has a considerably high speed, that is,
- the present inventors have found that it is possible to blow the gas into the furnace area as a supply air flow having a flow rate of usually 8 Om / sec or more, and based on such knowledge, have reached the present invention.
- a plurality of hollow heated tubes or a plurality of heated tubes filled with a catalyst are disposed in the furnace region of the heating furnace, and the atmosphere outside the heated tubes is heated by a combustion device.
- a heating furnace having a structure for heating and generating and maintaining a heating and / or chemical reaction of a pipe fluid
- a plurality of combustion devices arranged on the side wall surface and for introducing a combustion air supply flow into an intermediate region in the furnace between the heating tube rows,
- Each of the combustion devices includes a heat storage body for storing sensible heat held by the combustion exhaust gas, and a burner capable of supplying a combustion fuel fluid to the combustion air supply flow, wherein the heat storage body includes combustion air or combustion air.
- a heat dissipation mode in which the supply air stream is preheated to a high temperature by heat transfer contact with a combustion air supply stream comprising a combustion gas, and a heat storage mode in which heat is received by exchanging heat with the combustion exhaust gas in the furnace. Burning by a combustion air supply flow preheated to a high temperature by the heat storage element in a heat dissipation mode, and heating the heat storage element by a heat exchange action between the heat storage element in the heat storage mode and the combustion exhaust gas in the furnace;
- the heat release mode and the heat storage mode of the heat storage element are alternately controlled at predetermined time intervals, and the burner is provided with a combustion air supply flow preheated by the heat storage element or the fuel in an intermediate region in the furnace. Injecting fluid, heating the heated pipe by the heat of combustion reaction of the fuel fluid,
- the heating furnace further includes a flue gas deriving unit that derives a predetermined portion of a fluid portion of the flue gas generated in the furnace region to the outside of the heating furnace.
- a heating furnace including a heat exchange device for performing heat exchange between the combustion exhaust gas derived from the heating furnace and the fluid to be heated and / or any fluid.
- each heating tube row is arranged in a high-temperature combustion gas or a high-temperature atmosphere area surrounded by a furnace wall, and receives heat of steam and carbon dioxide in the high-temperature combustion gas effectively to be heated.
- the combustion device blows the combustion air supply flow and the fuel fluid preheated to a high temperature into the intermediate region in the furnace between the rows of heating tubes.
- the combustion gas directly contacts the heated pipe near the burner injection hole.
- a uniform temperature distribution and temperature gradient of the heated pipe can be ensured without locally heating the heated pipe, and a good convection heat transfer effect can also be achieved.
- a high heat transmission value of the pipe wall to be heated is achieved by the synergistic effect of the heat radiation effect of the high-temperature combustion gas and the convection heat transfer effect of the high-temperature high-speed supply air flow.
- the combustion exhaust gas in the furnace has a total sensible heat amount exceeding a required sensible heat amount to be stored in the heat storage body of the combustion device.
- the fluid portion of the ratio is led out of the heating furnace, and the heat exchange action with the fluid to be heated or an arbitrary fluid through the heat exchanger causes the combustion exhaust gas that exceeds the required sensible heat of the high-cycle switching type thermal storage combustion system.
- Excess sensible heat can be effectively used for multiple purposes. Therefore, it was concluded that the sensible heat of the combustion exhaust gas exceeding the sensible heat that can be effectively used in the high-cycle switching regenerative heat storage system could be used effectively to achieve a further improvement in the overall thermal efficiency of the heating furnace. Become.
- the in-furnace combustion exhaust gas is discharged from the second combustion device during the combustion operation of the first combustion device by the combustion air supply flow preheated to a high temperature by the heat storage body of the first combustion device. Passing through a second flow path containing the heat storage, heating the heat storage; During the combustion operation of the second combustion device due to the combustion air supply flow preheated to a high temperature by the heat storage material of the second combustion device, the combustion exhaust gas in the furnace passes through the first flow path including the heat storage material of the first combustion device. The regenerator is heated, and the flow path of the combustion exhaust gas in the furnace and the flow path of the combustion air supply flow are selectively switched to one of the first flow path and the second flow path at predetermined time intervals. Is done.
- the flue gas portion having a desired flow rate and having a sensible heat exceeding a required sensible heat amount required in the high cycle switching type regenerative combustion system is supplied to the furnace via the flue gas deriving means. It is led out of the furnace from the inner region.
- the flow ratio of the flue gas portion to be led out of the furnace is set to 10% to 30% (weight ratio) of the total circulation flow or the total supply / discharge flow of the heating furnace.
- the flue gas derivation duct rising from the hearth is arranged on the bottom wall surface of the heating furnace in parallel with the row of heating tubes.
- the flue gas outlet duct is made of a refractory brick or heat-resistant ceramic duct having a rectangular cross section, a trapezoidal cross section, or a U-shaped cross section, and has a plurality of exhaust openings through which the combustion flue gas in the furnace can pass.
- a ventilation hole is formed in the wall of the duct side wall. The amount of exhausted flue gas is adjusted or regulated by the attraction pressure of the exhaust air induction fan and the area of the exhaust opening or vent hole.
- the fluid transfer duct at the floor of the heating furnace defined by the flue gas outlet duct is interconnected with the furnace area through a number of the above-mentioned exhaust openings or vents. It is extracted to the outside of the heating furnace through the fluid transfer duct.
- natural gas is used as the fuel fluid.
- the combustion air is air in an external atmosphere having an average temperature of 20 ° C.
- the combustion air heated to about 150 ° C in the heat storage body and the heat exchanger provided in a heating furnace.
- the natural gas preheated to about 300 ° C. is supplied to the burner, where it undergoes a combustion reaction to heat the fluid to be heated in the pipe to be heated.
- about 85% of the combustion exhaust gas which has been cooled to about 110 ° C. is led to the heat accumulator, and exchanges heat with the combustion air via the heat accumulator, and Released to atmosphere after cooling to 85 ° C.
- the remaining 15% of the flue gas is sent to a heat exchanger attached to the heating furnace. Then, the fluid to be heated and the fuel natural gas are preheated, cooled to about 170 ° C, and released to the atmosphere. As a result, the thermal efficiency due to the operation of the heating furnace body reaches 89.5%, and the total thermal efficiency of the entire heating furnace including the heat exchange device reaches 95.5%.
- This thermal efficiency value takes into account the heat loss of about 1% from the heating furnace housing including the furnace walls, heat exchangers and piping.
- the heated pipe comprises a water vapor reforming pipe filled with a catalyst, and the heat exchange device heats a mixed gas of steam and hydrocarbon. It includes a heat exchanger or a heat exchanger that heats the fuel fluid.
- the interval (W) between the rows of heating tubes is substantially equal to the value of depth (D) / interval (W) defined by the ratio of the interval (W) to the depth (D) of the in-furnace region. It is set to indicate a value within the range of 2 to 8. More preferably, the mutual interval (P) between the heated tubes is a value of the interval (P) / outer diameter (d) defined as a ratio of the interval (p) to the outer diameter (d) of the heated tube. , Are set to indicate values substantially in the range of 1.5 to 2.5.
- the heating furnace according to the present invention comprises a reforming reaction gas producing plant for ammonia synthesis, a reforming reaction gas producing plant for methanol synthesis, or a steam reforming plant in a hydrogen gas producing plant. Used as a quality furnace.
- the heating furnace according to the present invention is used as a reactor of an ethylene production plant.
- FIG. 1 is a schematic flow chart showing the configuration of an apparatus system using a heating furnace according to an embodiment of the present invention as a steam reforming reactor for producing hydrogen or synthesizing methanol.
- FIG. 2 is a schematic vertical sectional view showing the entire structure of the heating furnace shown in FIG.
- FIG. 3 is a schematic cross-sectional view showing the entire structure of the heating furnace shown in FIG. 1 and a vertical cross-sectional view showing the structure of the exhaust gas duct.
- FIG. 4 is a schematic block flow diagram showing the overall configuration and operation of the burner assembly of the heating furnace.
- FIG. 5 is a partial cross-sectional view of a heating furnace illustrating a modification example of the arrangement of the first and second burner assemblies.
- FIG. 6 is a schematic cross-sectional configuration diagram of a heating furnace illustrating a modification example of an arrangement of catalyst tubes or heated tubes in the furnace.
- FIG. 7 is a schematic block diagram of a heat storage combustion system illustrating a modification of the configuration of the burner assembly.
- FIG. 1 is a flow diagram showing a schematic configuration of an apparatus system provided with a heating furnace according to an embodiment of the present invention.
- the heating furnace according to this embodiment is a water steam reformer for hydrogen production or methanol synthesis. Used as a reactor.
- the apparatus system shown in FIG. 1 includes a heating furnace 1 constituting a steam reforming reaction gas furnace, a first heat exchanger 2 through which a mixed gas of hydrocarbon and steam can pass, and an is 2 through which fuel gas can pass. And a heat exchanger 3.
- the heating furnace 1 and the first heat exchanger 2 that constitute the reformer are connected in series via a raw material supply line L1 and a raw material supply line L2 of a mixed gas of hydrocarbon and steam.
- the raw material feed line L2 communicates with the catalyst tube 10 of the heating furnace 1, and the catalyst tube 10 vertically penetrates the heating furnace main body 11.
- the mixed gas of hydrocarbon and steam is introduced into the upper end of the catalyst tube 11, flows down in the catalyst tube 201, and burns at a high temperature in the furnace combustion zone through the tube wall of the catalyst tube 11. Heat is received by the heating action of the gas.
- the steam reforming reaction of the mixed gas proceeds, and the temperature of the mixed gas rises, and the reforming reaction gas heated to a predetermined temperature is reformed from the lower end of the catalyst tube 11. It is led to the gas delivery line L3.
- the reformed gas delivery line L3 is connected to a system (not shown) for executing a predetermined next process,
- the heating furnace 1 includes a catalyst tube 10 filled with a predetermined catalyst, burner assemblies 12 and 13 including a burner and a heat storage body, and a heating furnace main body 11 that defines a combustion zone in the furnace. You.
- the flue gas from the heating furnace body 11 is composed of exhaust gas lines El, E2, and E3.
- the gas is exhausted to the outside of the reforming reaction gas production plant via the first exhaust gas system and the second exhaust gas system consisting of the atmospheric release line E4.
- the exhaust gas line E1 connected to the heating furnace body 11 communicates with the exhaust gas line E2 via the first heat exchanger 2.
- the exhaust gas line E2 communicates with the exhaust gas line E3 via the second heat exchanger 3.
- An exhaust gas induction fan 6 is provided in the exhaust gas line E3, and attracts the combustion exhaust gas of the heating furnace main body 11 through the first and second heat exchangers 2, 3 and the exhaust gas lines El, E2, E3.
- the mixed gas of hydrocarbon and steam supplied through the raw material supply line L1 exchanges heat with the combustion exhaust gas of the heating furnace body 11 in the first heat exchanger 2, and is supplied through the fuel gas supply line LF.
- the fuel fluid exchanges heat with the exhaust gas of the exhaust gas line E2 in the second heat exchanger 3.
- the burner assemblies 12 and 13 arranged in a plurality of stages on both sides of the heating furnace body 11 are provided with burners (not shown) that operate intermittently or periodically at predetermined time intervals. .
- the burners of each burner assembly 12 and 13 are connected to a fuel gas supply source (not shown) via a fuel gas supply line LF, and are also provided via a combustion air supply line LA. Connected to the combustion air blower 4.
- Each of the burner assemblies 12 and 13 is provided with a heat storage body (not shown) having a predetermined structure.
- An exhaust fan 5 is interposed in the atmosphere discharge line E4, and the exhaust gas of the heating furnace body 11 is released to the atmosphere via the heat storage bodies of the burner assemblies 12 and 13 by the attraction pressure of the exhaust fan 5. Attracted to release line E4.
- FIG. 2 is a schematic longitudinal sectional view showing the entire structure of the heating furnace 1 shown in FIG. 1
- FIG. 3 is a schematic transverse sectional view showing the entire structure of the heating furnace 1 shown in FIG.
- FIG. 3A is a longitudinal sectional view of the exhaust gas duct taken along the line I-I shown in FIG.
- the heating furnace 1 includes a heating furnace body 11 through which the catalyst tube 10 vertically penetrates, and a plurality of catalysts vertically penetrating through an in-furnace region 15 of the heating furnace body 11.
- Tube 10 Each catalyst tube 10 erected substantially vertically in the furnace region 15 is made of a reformer tube such as a high-alloy centrifugal tube and the like.
- a predetermined catalyst such as a nickel crystal catalyst for activating the reforming reaction of the hydrogen / steam mixed gas is filled.
- each catalyst tube 10 penetrates the top wall 11 c of the heating furnace body 11 and is connected to the raw material supply pipe 16 via a hairpin tube capable of absorbing the thermal expansion and contraction of the catalyst tube 10,
- the raw material supply pipe 16 is connected to a raw material supply header (not shown).
- the catalyst tubes 10 are arranged in a plurality of rows in the furnace region 15 of the heating furnace body 11.
- the catalyst tube row is constituted by a plurality of catalyst tubes 10 which are aligned in the tube length direction or the axial direction of the raw material supply tube 16 and arranged substantially vertically.
- each catalyst tube row includes about 10 to 15 catalyst tubes 10 linearly arranged in the furnace region 15.
- the heating furnace body 1
- each catalyst tube 10 penetrates the bottom wall 1 Id of the heating furnace body 11 and is connected to a reforming reaction gas discharge pipe 17 via a hairpin tube, and the discharge line is formed.
- the pipe 17 is connected to a collector (not shown) connected to the first feed line L3 (FIG. 1).
- the heating furnace main body 11 has a first side wall 1 la and a second side wall 1 lb which are laid or lined with a refractory is insulating material such as a refractory insulating brick or a castable refractory material.
- the pair of second side walls 1 lb extend in the width direction of the catalyst tube row, and the opposing first left and right side walls 11 a extend parallel to the catalyst tube row.
- the first and second side walls 11 a and l ib are oriented in directions orthogonal to each other, and are interconnected at each corner of the in-furnace region 15.
- the 20-paner assemblies 12 and 13 are arranged on the second side walls 11b on both sides in a vertically arranged plural stages.
- the burner assemblies 12 and 13 are alternately arranged in the vertical direction on the second side wall 11b, and alternately arranged at a predetermined interval in the width direction of the second side wall 1lb. Is done.
- the burner assemblies 12 and 13 are composed of a group of burner assemblies 12 and 13 arranged in four stages vertically and four rows horizontally.
- the burner assemblies 12, 13 are arranged on each second side wall 11 b in such a manner that the supply / exhaust ports 14 of the burner assemblies 12, 13 are located in the middle region in the furnace located between the respective catalyst tube rows. Opened on the wall of 11b and arranged at predetermined intervals.
- Hydrocarbons heated to a temperature of 400 ° C. to 700 ° C. in the first heat exchanger 2 and The mixture of steam is introduced into the catalyst tube 10 via the raw material supply line 16. While flowing down the catalyst tube 10, the hydrocarbon / steam mixture is heated by the radiation and convection heat transfer of the high-temperature combustion gas that forms the external atmosphere or the outside atmosphere of the catalyst tube 10, and the catalyst is heated.
- 600 ° C to 900 ° C by the sensible heat input through the tube wall of the catalyst tube 10. Heat to a temperature of ° C.
- the high-temperature reaction product generated by the endothermic reforming reaction in the catalyst tube 10 is collected by a collector (not shown) via a discharge pipe 17 and supplied to the next step (purification step).
- the heat load in the furnace area 15, that is, the required heat input by the burner assemblies 12 and 13, is the required reaction heat required for the reforming reaction of the steam / hydrocarbon mixed gas and the raw material gas is raised to a predetermined temperature. It substantially corresponds to the total amount of required sensible heat to be heated.
- the distance W between the catalyst tube rows and the depth D of the in-furnace region 15 are the capacity of the burner 19 (Fig. 4) provided in the heating furnace 1 and the design surface of the catalyst tube 10. Generally set based on temperature.
- the interval W between the catalyst tube rows is preferably set to a value of depth D / interval W substantially from 2 to 2.
- the mutual interval P of 10 is set such that the ratio of the interval p to the outer diameter d of the catalyst tube 10 (interval p / outer diameter d) substantially indicates a value of 1.5 to 2.5. .
- the entire length of the catalyst tube 10 can be arbitrarily set to an appropriate total length in the furnace that exhibits an appropriate temperature gradient and heating capacity within an allowable range of the pressure loss of the fluid in the tube.
- an exhaust gas duct 40 is arranged on the bottom wall 11 d of the heating furnace main body 11.
- the exhaust gas duct 40 is arranged in the middle area in the furnace between the catalyst tube rows, rises above the bottom wall 11 d, and extends in the furnace area 15 in parallel with the catalyst tube row and the first side wall 11 a. Extend.
- each exhaust gas duct 40 is located above the bottom wall 11d. It has left and right side walls 42 extending upward from the surface, and a top wall 41 interconnecting the top edges of the side walls 42.
- a plurality of flue gas outlet holes 43 having a predetermined opening area are formed in the side wall 42 at predetermined intervals.
- the zone in the duct defined by the top wall 41 and the side wall 42 communicates with the atmosphere inside the furnace through the flue gas outlet hole 43, and is parallel to the first side wall 11a and the catalyst tube row.
- a flue gas discharge passage extends above the bottom wall 11c.
- the exhaust gas duct 40 is connected to an exhaust gas line E1 via a communication pipe 44 (FIG. 2), and the combustion exhaust gas having a predetermined flow rate generated in the furnace area 15 of the heating furnace 1 is supplied to the exhaust gas duct 40, It is sent to the first heat exchanger 2 (FIG. 1) via the communication pipe 44 and the exhaust gas line E1.
- the communication pipe 44 is connected to one end of the exhaust gas duct 40 as shown by a broken line in FIG.
- An opening is provided in the area of the duct 40.
- FIG. 4 is a block flow diagram showing an operation mode of each burner assembly 12, 13.
- the burner assemblies 12 and 13 are a burner 18 connected to the fuel gas supply line and the combustion air supply line LA, respectively, and a switching heat storage type heat preheating the combustion air. And an exchanger 19.
- the burner 18 is provided with a first burner and / or a pilot burner that blows a fuel fluid into a combustion air flow path located between the air supply / exhaust port 14 and the heat exchanger 19, and an air supply / exhaust port 14.
- a second burner or a main burner which is disposed on an adjacent furnace wall and injects a fuel fluid toward a furnace internal combustion region;
- the switchable heat storage type heat exchanger 19 recovers waste heat by heat exchange with the combustion exhaust gas of the heating furnace body 11 (heat storage mode) and heat exchange with the combustion air in the line LA (radiation mode). Preheat combustion air.
- the group of burner assemblies 12 and the group of burner assemblies 3D are configured to set the waste heat recovery operation and the combustion operation at predetermined time intervals, for example, at intervals of 20 to 120 seconds, preferably at 60 seconds or less.
- a high-period or high-speed regenerative heat storage combustion system that alternately repeats at a predetermined time interval is set, and each of the switched regenerative heat exchangers 19 alternately performs the heat storage mode and the heat release mode alternately. .
- a burner 18 and a switching regenerative heat exchanger 19 are interposed in series.
- the first flow path HI and the second flow path H2 selectively communicate with the combustion air supply line LA or the atmosphere release line E4 via a four-way valve V that is switched and controlled at predetermined time intervals.
- the four-way valve V connects the first flow path HI of the burner assembly 12 to the combustion air supply line LA at the first position shown in FIG. 4A, and the second flow path of the burner assembly 13 H2 is connected to the atmosphere release line E4.
- the four-way valve V connects the first flow path HI to the atmosphere release line E4 and the second flow path H2 to the combustion air supply line LA at the second position shown in FIG. 4 (B).
- Each burner 18 is connected to a fuel gas supply line LF via a fuel supply valve (not shown), and each fuel supply valve is controlled by a control device (not shown).
- the synchronous switching operation is performed at the switching timing of the direction valve V, and the fuel gas is alternately supplied to one of the first and second burner assemblies 12 and 13. Therefore, the burner 18a of the first burner assembly 12 burns at the first position (FIG. 4 (A)) of the four-way valve V, and the second position (FIG. 4 (B)) of the four-way valve V. ), The combustion operation is stopped.
- the burner 18 b of the second burner assembly 13 starts the combustion operation at the second position (FIG. 4B) of the four-way valve V, and Stop the combustion operation at 1 position (Fig. 4 (A)).
- the combustion exhaust gas derived from the heating furnace main body 11 passes through the switching regenerative heat exchanger 19 b of the second burner assembly 13 and the atmospheric discharge line E4. Exhaust heat of the combustion exhaust gas is stored in the regenerative heat exchanger 19b of the second parner assembly 13 (FIG. 4 (A)).
- the regenerative heat exchanger 19b is maintained in the heat storage mode in which the flue gas contacts the combustion exhaust gas.
- the regenerative heat exchanger 19b of the second burner assembly 13 is introduced via the combustion air supply line LA and the second flow path H2 during the subsequent combustion operation of the second burner assembly 3D 13. Preheat the combustion air (Fig. 4 (B)).
- the exhaust heat of the flue gas discharged from the heating furnace main body 11 is stored in the switched heat storage type heat exchanger 19 a of the first burner assembly 12. (Fig. 4 (B)). Therefore, during the combustion operation of the second burner assembly 13, the heat storage type heat exchanger 19 a is held in the above heat storage mode, while the heat storage type heat exchanger 19 b is provided with the combustion air and the heat transfer. It is kept in contact heat dissipation mode.
- the regenerative heat exchanger 19 a preheats the combustion air introduced via the combustion air supply line LA and the first flow path HI during the combustion operation of the first burner assembly 12 following the bow I. (Fig. 4 (A)). That is, the regenerative heat exchanger 19a is maintained in the above-described heat release mode when the first burner assembly 12 performs the combustion operation.
- a ceramic or metal heat storage body having a honeycomb structure provided with a large number of flow paths can be preferably used.
- a ceramic heat storage element generally used as a catalyst carrier and having a large number of narrow channels can be preferably used.
- the honeycomb-type regenerator has a desired volumetric efficiency, and the wall thickness of each honeycomb wall constituting the regenerator of the honeycomb structure is set to 1.6 or less, and The distance between the walls (honeycomb pitch) is set to 5 thighs or less.
- the structure of this type of honeycomb-type heat storage element is disclosed in detail in Japanese Patent Application Laid-Open No. Hei 6-213585 (Japanese Patent Application No. Hei 5-69911). Further detailed description is omitted by quoting.
- the high-temperature fluid (combustion exhaust gas) and the low-temperature fluid (combustion air) are alternately supplied to the regenerative heat exchangers is 19 of the first and second burner assemblies 12 and 13.
- the amount of heat removed from the high-temperature fluid by the heat transfer contact is given to the low-temperature fluid by the heat transfer contact with the low-temperature fluid, thereby performing heat exchange between the high-temperature fluid and the low-temperature fluid.
- the direct heat exchange effect of the high-temperature fluid (combustion exhaust gas) and the low-temperature fluid (combustion air) through the heat storage unit 19 is used, and the switching time of the fluid passage (flow path) is shortened.
- the temperature efficiency of about 60 to 70%, which was the limit in the conventional heat exchanger, can be reduced to 70 to 100%. Can be improved.
- Each of the burners 18 of the first and second burner assemblies 12 and 13 is disposed in a large number of blow holes (supply / exhaust ports 14) formed in the side wall 11 b of the heating furnace 1. Under the high-speed switching control of the control device 25 (not shown), synchronous switching control is performed together with the four-way valve V (FIG. 5). Each of the burners 18 is alternately burned by the combustion air blown by the combustion air blower FA and the fuel fluid such as natural gas supplied through the fuel gas supply line LF. The temperature of the combustion air in the combustion air supply line LA rises due to the heat transfer effect of the heat storage type heat exchanger 19 of the burner assembly 12 or 13.For example, it is preheated to 800 to 150 ° C.
- the combustion reaction is performed by the fuel gas of the burner 18 supplied by the fuel gas supply line LF, and the catalyst tube 10 is heated.
- Most of the combustion exhaust gas generated in the heating furnace body 11 exchanges heat with the regenerative heat exchanger 19 of the parner assembly 12 or 13 and reaches, for example, 50 to 200 ° C. After cooling, it is released to the atmosphere via the atmospheric release line E4 and the chimney.
- a predetermined portion of the flue gas portion preferably a flue gas fluid portion having a weight ratio of 10 to 30%, is drawn or introduced into the flue gas outlet hole 43 of the exhaust gas duct 40, and is introduced into the exhaust gas duct 40 duct. It is supplied to the first heat exchanger 2 and the second heat exchanger 3 via the area, the communication pipe 44 and the exhaust gas line E1.
- the flue gas exchanges heat with the hydrocarbon / steam mixed gas and the fuel fluid for combustion in the first heat exchanger 2 and the second heat exchanger 3, and the waste heat recovery process causes the waste heat to be recovered at 100 ° C. to 250 ° C. Cooled to ° C, and then released to the atmosphere via a chimney.
- the arrangement of the first and second panner assemblies 12 and 13 can be arbitrarily set, and the combustion gas exerts an appropriate radiant heat transfer function and a convective heat transfer function of the combustion gas.
- Any burner arrangement capable of forming an air flow in the furnace intermediate region between the above-described catalyst tube row or heated pipe row can be employed.
- a plurality of parner assemblies separated in the width direction of the furnace wall are arranged in a single pipe row intermediate region, and a pair of left and right first and second burner assemblies are arranged.
- a burner arrangement in which 12 and 13 are arranged vertically in the furnace wall may be employed.
- a pair of upper and lower first and second burner assemblies 12 and 13 are arranged in a row in the width direction of the furnace wall (FIG. 5 (B)), or a catalyst tube or a heated tube 10 is arranged.
- Burner arrangement in which a pair of left and right first and second burner assemblies 12 and 13 are arranged in such a manner as to sandwich the tube 10 on both sides Fig. 5 (C)
- a high-period or high-speed switching type heat storage and combustion system of another structural type for example, a ball type such as a plurality of ceramic balls It is possible to employ a burner assembly provided with a switching regenerative combustion air high temperature preheating mechanism having a regenerator or a spherical regenerator.
- connection position of the communication pipe 44 to the exhaust gas duct 40 is not limited to one end of the exhaust gas duct 40, but may be set at the center or both ends of the exhaust gas duct 40.
- the heated pipe is not limited to the form of the catalyst pipe or the heated pipe of the above embodiment which is disposed so as to vertically penetrate the furnace area.
- FIG. As shown in the above, various configurations of the heated pipe can be adopted.
- the heated pipe 10 shown in Fig. 6 (A) has a vertical and hollow riser pipe 10b arranged in the central area inside the furnace and a lower connection where the lower end of the riser pipe 10b is connected. It comprises a pipe 10 c and a catalyst filling pipe 10 a interconnected via a lower connecting pipe 10 c, and the fluid to be heated flows down in the catalyst filling pipe 10 a and is heated. , Riser rises in 1 Ob and flows out.
- the heated pipes 10 shown in FIGS. 6 (B) and 6 (D) are U-shaped continuous pipes extending downward as a whole, and the fluid to be heated in each continuous pipe is a heated pipe. It flows in from one upper end of the pipe 10, flows down in the pipe, and flows out of the other upper end of the pipe 10 to be heated. Further, the heated pipe 10 shown in FIGS. 6 (C) and 6 (E) is a U-shaped continuous pipe extending in the entire horizontal direction, and the fluid to be heated in the pipe is a heated pipe.
- the burner assembly 12, 13 is a heat storage combustion system of a type including a rotary heat storage body 20 which is formed in a cylindrical outer shape as a whole.
- a heat storage combustion system of a type including a disc-shaped flow path switching means 32 can be configured.
- Fig. 7 (A) the rotary storage that constitutes the thermal storage combustion system is shown.
- the heat body 20 is interposed in a first flow path (combustion air flow path) HI and a second flow path (combustion exhaust gas flow path) H2 isolated by the partition 21.
- the rotary regenerator 20 alternately comes into contact with the combustion air flowing in the first flow path HI and the flue gas flowing in the second flow path H2, and alternately repeats the heat storage mode and the radiation mode.
- the first heat storage part 22 and the second heat storage part 23 are provided.
- the fixed heat storage element 30 includes a first flow path HI and a second flow path H2 separated by a partition wall 31, a rotating disk type flow path switching device 32, Is provided.
- the flow path switching device 32 includes an air supply port 34 constantly communicating with the combustion air supply path 33, and an exhaust gas outlet 36 constantly communicating with the combustion exhaust gas flow path 35.
- the first heat storage portion 37 and the second heat storage portion 38 alternately repeat the heat storage mode and the heat release mode by the rotation of the flow path switching device 32.
- the characteristics or characteristics of a high-period or high-speed switching type regenerative combustion system having a high-temperature preheating function for combustion air are effectively used, and a high overall thermal efficiency is exhibited. It is possible to realize an economical and compact heating furnace that can be obtained.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58806/98A AU5880698A (en) | 1997-02-26 | 1998-02-16 | Heating furnace for fluid |
JP53749498A JP4059527B2 (ja) | 1997-02-26 | 1998-02-16 | 流体の加熱炉 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/41960 | 1997-02-26 | ||
JP4196097 | 1997-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998038459A1 true WO1998038459A1 (fr) | 1998-09-03 |
Family
ID=12622765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/000611 WO1998038459A1 (fr) | 1997-02-26 | 1998-02-16 | Four de chauffage pour fluide |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP4059527B2 (ja) |
AU (1) | AU5880698A (ja) |
WO (1) | WO1998038459A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003087667A1 (fr) * | 2002-03-29 | 2003-10-23 | Chiyoda Corporation | Procede de commande de reacteur de combustion et reacteur |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101389319B1 (ko) * | 2012-07-23 | 2014-05-07 | 한국에너지기술연구원 | 촉매를 활용한 연료 부분 산화 특징을 갖는 축열식 순산소 연소 시스템 및 그 연소 시스템을 이용한 연소방법 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993005343A1 (en) * | 1991-09-02 | 1993-03-18 | Nippon Furnace Kogyo Kabushiki Kaisha | Boiler |
-
1998
- 1998-02-16 AU AU58806/98A patent/AU5880698A/en not_active Abandoned
- 1998-02-16 JP JP53749498A patent/JP4059527B2/ja not_active Expired - Fee Related
- 1998-02-16 WO PCT/JP1998/000611 patent/WO1998038459A1/ja active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993005343A1 (en) * | 1991-09-02 | 1993-03-18 | Nippon Furnace Kogyo Kabushiki Kaisha | Boiler |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003087667A1 (fr) * | 2002-03-29 | 2003-10-23 | Chiyoda Corporation | Procede de commande de reacteur de combustion et reacteur |
US6951458B2 (en) | 2002-03-29 | 2005-10-04 | Chiyoda Corporation | Reactor combustion control method and reactor |
CN1308616C (zh) * | 2002-03-29 | 2007-04-04 | 千代田化工建设株式会社 | 反应炉的燃烧控制方法及反应炉 |
Also Published As
Publication number | Publication date |
---|---|
AU5880698A (en) | 1998-09-18 |
JP4059527B2 (ja) | 2008-03-12 |
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