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WO2002014773A1 - Reservoir thermique - Google Patents

Reservoir thermique Download PDF

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Publication number
WO2002014773A1
WO2002014773A1 PCT/JP2001/006985 JP0106985W WO0214773A1 WO 2002014773 A1 WO2002014773 A1 WO 2002014773A1 JP 0106985 W JP0106985 W JP 0106985W WO 0214773 A1 WO0214773 A1 WO 0214773A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycomb
temperature
gas
honeycomb structure
heat storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2001/006985
Other languages
English (en)
Japanese (ja)
Inventor
Yutaka Suzukawa
Isao Mori
Hirokazu Katsushima
Yoshiyuki Kasai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Nippon Furnace Co Ltd
JFE Engineering Corp
Original Assignee
NGK Insulators Ltd
Nippon Furnace Co Ltd
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd, Nippon Furnace Co Ltd, NKK Corp, Nippon Kokan Ltd filed Critical NGK Insulators Ltd
Priority to AU2001278719A priority Critical patent/AU2001278719A1/en
Publication of WO2002014773A1 publication Critical patent/WO2002014773A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material

Definitions

  • the present invention relates to a heat storage element, and more particularly to a heat storage element that can be prevented from cracking due to thermal stress and can be used stably for a long period of time.
  • regenerator for a regenerative type burner which is one of the purposes of using the regenerator according to the present invention.
  • the regenerative burner is equipped with a heat storage unit attached to each burner, and exchanges heat between the combustion exhaust gas and the combustion air, thereby obtaining high-temperature preheated air and performing highly efficient combustion. It is Pana.
  • FIG. 4 is a schematic sectional view showing a heating furnace in which a regenerative parner is installed.
  • 1 is a heating furnace
  • 2a 2b is a pair of regenerative parners installed facing the furnace wall of heating furnace
  • 3a 3b is a regenerative parner 2a 2b
  • the heat storage bodies 3a and 3b preferably have a large specific surface area, and are composed of a plurality of honeycomb structures as disclosed in Japanese Patent Application Laid-Open No. Hei 4-251190.
  • 4a and 4b are fuel shut-off valves, and while this valve is open, pressurized fuel is supplied from a fuel supply source (not shown) to the parner 2a 2b at a predetermined flow rate. .
  • 5a and 5b are combustion air valves, and while this valve is open, pressurized air is supplied to the parner 2a2b at a predetermined flow rate from an air supply source (not shown). .
  • Numerals 6a and 6b denote flue gas valves. While these valves are open, flue gas that has passed through the regenerators 3a and 3b by an exhaust blower (not shown in the figure) Is aspirated at a predetermined flow rate and released to the atmosphere.
  • Reference numeral 7 denotes an object to be heated such as a steel slab in the heating furnace 1.
  • D1 and D2 are thermometers, T1 is a high temperature (combustion side) thermometer, and T2 is a low temperature (anti-combustion side) thermometer.
  • the fuel cutoff valve 4a is opened to supply fuel. Further, the combustion air valve 5a opens, the combustion exhaust gas valve 6a closes, and air is pushed into one of the heat storage bodies 3a. The air that has passed through the heat storage body 3a deprives the heat storage body 3a of heat and is supplied to the burner 2a as high-temperature preheated air.
  • both the fuel cutoff valve 4 b and the combustion air valve 5 are closed, and the combustion exhaust gas valve 6 b is open, and the gas in the furnace is sucked from the parner 2 b and the regenerator 3 b After heating this through b, it is exhausted by an exhaust blower.
  • alternating combustion is performed in which the combustion between the panners 2a and 2b is alternately performed at regular intervals.
  • the switching time is generally short, about 30 seconds to 2 minutes.
  • both the fuel cutoff valve 4a and the combustion air valve 5a are closed, and the combustion exhaust gas valve 6a is open, and the gas in the furnace is sucked from the parner 2a and the regenerator After heating through 3a, it is exhausted by an exhaust blower.
  • a heating furnace using such a regenerative burner when the regenerative burner is in a thermal storage state, the furnace gas is sucked into the burner, so that the high temperature side of the regenerator is generally The furnace is heated to the gas temperature.
  • the gas in the furnace that has passed through the regenerator heats the regenerator to a low temperature. If the suction of the furnace gas is continued, it is possible to heat the inside of the regenerator to the furnace gas temperature, but if the suction of the furnace gas is continued, it will pass through the regenerator
  • the gas temperature on the low temperature side of the regenerator from which the in-furnace gas flows out rises.
  • the gas temperature on the low temperature side of the regenerator can be obtained at the heat-resistant temperature of the flue gas valve, for example, at an economical price.
  • the gas temperature in the furnace on the low temperature side of the heat storage body is too low. That is, if the combustion exhaust gas contains sulfur, etc. in the fuel component in addition to water, a part of the combustion exhaust gas may condense at a temperature of about 150 ° C or less and generate combustion water. is there. Since the combustion water corrodes the piping and the flue gas valve, the gas temperature in the furnace on the low temperature side of the regenerator may be maintained at a maximum of 350 ° C or less, and an average of about 180 ° C. preferable.
  • the regenerative burner when the regenerative burner is in the combustion state, normal-temperature combustion air is supplied to the low-temperature side of the regenerator, and while passing through the regenerator, the high-temperature regenerator removes heat and is preheated. Supplied to PANA.
  • the heat storage parner it is preferable to operate so that preheated air with the highest possible temperature can be obtained.
  • the maximum temperature of the preheated air obtained by the regenerative burner is the furnace gas temperature. In practice, it is sufficient that a preheated air temperature lower by about 50 to 100 ° C. than the gas temperature in the furnace is obtained.
  • the temperature of the gas passing through the heat storage element on the high-temperature side of the heat storage element is 100 ° from the furnace gas temperature and the furnace gas temperature.
  • the temperature changes within the range of the preheated air temperature which is lower by about C.
  • the combustion state starts from about 350 ° C which is the maximum temperature of the outflow temperature of the furnace gas when the heat storage state is completed.
  • the temperature changes within a temperature range of about 30 ° C, which is the temperature of room temperature air.
  • the size of the regenerator 3 is such that the gas cross section is 40 It is 400 mm wide and the height of the heat storage body is about 400 mm.
  • honeycomb structure Six were arranged, and four layers were stacked in the height direction.
  • the cross-sectional area of the gas passage (thin tube) of the honeycomb structure constituting the heat storage body was the same in any of the honeycomb structures.
  • FIG. 6 is a schematic perspective view showing one honeycomb structure 8 constituting the heat storage body.
  • the length, width, and height dimensions of the honeycomb structure are denoted by symbols d, w, and h, respectively.
  • FIG. 7 is an enlarged view of the gas passage of the honeycomb structure 8.
  • the wall thickness of the honeycomb structure 8 is indicated by a symbol t, and the distance between the walls (pitch) is indicated by a symbol P.
  • the specific surface area of the heat storage body is 60 ⁇ 2 / ! ! 3 or more
  • the heat exchange performance is good, and if the wall thickness t is about 1.5 mm, it takes only about 1 s for the heat to be transmitted to the center of the wall by heat conduction and equalize.
  • a heat storage element is formed by combining a rectangular parallelepiped honeycomb structure having a length of about 100 mm, a width of about 100 mm and a height of about 100 mm.
  • this method has a problem that the honeycomb structure on the high-temperature side, into which the furnace gas flows, is cracked by thermal stress at the time of heating, the exchange cycle of the heat storage material is short, and the maintenance cost is increased. Stopping the equipment for replacement caused an increase in production machine losses.
  • the inventors of the present application have proposed a heat storage body disclosed in Japanese Patent Application Laid-Open No. H8-2476771 did.
  • the heat storage body has a plurality of stacked honeycomb structures in a direction in which the combustion air is fed, and also has a plurality of honeycomb structures divided in a cross section orthogonal to the flow of air.
  • the gas passage on the high temperature side (combustion side) of the body has a larger area than the low temperature side (anti-combustion side).
  • the cracks in the honeycomb structure occur when the thermal stress generated due to the temperature deviation in the height direction of the heat storage body-(in the axial direction of the thin tube) exceeds the material strength limit. Therefore, taking into account that the strength of the honeycomb structure decreases at high temperatures, g
  • an object of the present invention is to further improve the above-described prior invention, to prevent the cracks due to thermal stress, to use a honeycomb structure for obtaining a heat storage element that can be used stably for a long period of time, and to improve the honeycomb structure.
  • a heat storage body that quantitatively defines the relationship with the shape of the body. Disclosure of the invention
  • a honeycomb structure including a porous honeycomb structure, wherein the honeycomb structure is heated by passing a high-temperature gas through the honeycomb structure for a certain period of time and heated to a high temperature for the next predetermined period of time.
  • the plurality of honeycomb structures are stacked in the direction of the gas flow, and are orthogonal to the gas flow. Also, the honeycomb structure is divided into a plurality of sections in the same cross section as described above.
  • FIG. 1 is a graph showing the experimental results of the durability of the honeycomb structure.
  • FIG. 2 is a schematic perspective view showing the heat storage body used in the embodiment of the present invention.
  • FIG. 3 is a schematic perspective view showing a honeycomb structure of a hexagonal gas passage.
  • FIG. 4 is a schematic sectional view showing a regenerative burner heating furnace.
  • FIG. 5 is a schematic perspective view showing a heat storage body composed of a honeycomb structure having the same gas passage channel area.
  • FIG. 6 is a schematic perspective view showing a honeycomb structure of a test piece.
  • FIG. 7 is an enlarged view showing a gas passage.
  • FIG. 8 is a schematic perspective view showing the heat storage body of the prior invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • the inventors of the present application have found that the use temperature of the honeycomb structure in the heat storage and the shape of the honeycomb structure, that is, the height of the honeycomb structure (h) can prevent cracking due to thermal stress and can be used stably for a long period of time. , Width (w;), depth (d), projected area of gas passage cross-section (cross-sectional area of thin tube) (wXd) and volume (wXdXh) was performed.
  • thermometer T1 The average value of the furnace gas temperature measured by the thermometer T1 is changed from 1300 ° C to 400 ° C by changing the combustion load of the regenerative burner, and at the same time, the temperature is measured by the thermometer T2.
  • the long-term durability test of the heat storage material was performed by adjusting the furnace gas flow rate so that the average value of the furnace gas temperature was constant at approximately 200 ° C.
  • the test piece was made of ceramics containing 90% or more of alumina.
  • the horizontal axis shows the average temperature of the gas in the furnace measured by the thermometer T1
  • the vertical axis shows the dimensions, w, d, and h of the honeycomb test piece.
  • the solid line in the figure indicates the temperature range in which the honeycomb structure did not crack.
  • the present invention further specifically relates to the use temperature of the honeycomb structure, the height (h), the width (w), the depth (d), and the projected area of the gas passage cross section (cross sectional area of the thin tube) of the honeycomb structure.
  • Table 2 The relationship between (wXd) and volume (wXdXh) is defined as shown in Table 2, and a heat storage material that can prevent cracking due to thermal stress and can be used stably for ft period is obtained.
  • Table 2 shows the operating temperature in the high-temperature area (1 100 ° C ⁇ T ⁇ 1200 ° C, 1200 ° C ⁇ T) where cracks are most likely to occur, and the height (h) and width (w) of the honeycomb structure. ), Depth (d), projection area of gas passage cross section (cross-sectional area of thin tube) (wX d) and volume (wX d X h).
  • honeycomb structure having a hexagonal gas passage channel shown in FIG. Experimented. As a result, they found that if the dimension X in Fig. 3 was read as w and y was read as d, the results in Table 3 above would apply.
  • the thermal stress is reduced. Cracks can be prevented, and a heat storage element that can be used stably for a long period of time can be obtained.
  • maintenance costs can be reduced by extending the replacement cycle of the honeycomb structure, and production can be stopped by replacing equipment for replacement. Useful effects such as the effect of reducing mechanical loss can be obtained.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)

Abstract

L'invention concerne un réservoir thermique de brûleur à régénération comprenant une pluralité de corps structuraux en nid d'abeilles empilés dans un sens d'écoulement de gaz et divisés en une pluralité de parties également en section transversale orthogonale au sens d'écoulement du gaz, dans lequel les corps structuraux en nid d'abeilles ont une relation spécifiée dans la table 9 ci-dessous, de manière à éviter la fissuration du réservoir thermique par une contrainte thermique, afin de l'utiliser de manière stable pendant longtemps. Dans la table 6, (T) représente la température du nid d'abeilles utilisé, (h) représente la hauteur du nid d'abeilles, (W) représente la largeur du nid d'abeilles, (d) représente la profondeur du nid d'abeilles, (w x d) représente la surface projetée de la section transversale de passage du gaz du nid d'abeilles, (w x d x h) représente le volume du nid d'abeilles.
PCT/JP2001/006985 2000-08-14 2001-08-13 Reservoir thermique Ceased WO2002014773A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001278719A AU2001278719A1 (en) 2000-08-14 2001-08-13 Heat reservoir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-245672 2000-08-14
JP2000245672A JP2004286232A (ja) 2000-08-14 2000-08-14 蓄熱体

Publications (1)

Publication Number Publication Date
WO2002014773A1 true WO2002014773A1 (fr) 2002-02-21

Family

ID=18736149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/006985 Ceased WO2002014773A1 (fr) 2000-08-14 2001-08-13 Reservoir thermique

Country Status (3)

Country Link
JP (1) JP2004286232A (fr)
AU (1) AU2001278719A1 (fr)
WO (1) WO2002014773A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015210064A (ja) * 2014-04-30 2015-11-24 東京窯業株式会社 蓄熱体
JP6532180B1 (ja) * 2018-08-06 2019-06-19 株式会社ソディック 金属製の三次元造形物および金属製の三次元造形物の製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08114391A (ja) * 1994-10-18 1996-05-07 Ngk Insulators Ltd ハニカム状蓄熱体
JPH11211370A (ja) * 1998-01-27 1999-08-06 Nippon Furnace Kogyo Kaisha Ltd 蓄熱体及びそれに使用する蓄熱材ブロック片並びに蓄熱体の接着方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08114391A (ja) * 1994-10-18 1996-05-07 Ngk Insulators Ltd ハニカム状蓄熱体
JPH11211370A (ja) * 1998-01-27 1999-08-06 Nippon Furnace Kogyo Kaisha Ltd 蓄熱体及びそれに使用する蓄熱材ブロック片並びに蓄熱体の接着方法

Also Published As

Publication number Publication date
AU2001278719A1 (en) 2002-02-25
JP2004286232A (ja) 2004-10-14

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