JPH0755375A - Regenerating heat exchanger - Google Patents
Regenerating heat exchangerInfo
- Publication number
- JPH0755375A JPH0755375A JP5200666A JP20066693A JPH0755375A JP H0755375 A JPH0755375 A JP H0755375A JP 5200666 A JP5200666 A JP 5200666A JP 20066693 A JP20066693 A JP 20066693A JP H0755375 A JPH0755375 A JP H0755375A
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- transfer element
- heat exchanger
- layer
- ceramic
- 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.)
- Granted
Links
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 6
- 239000010453 quartz Substances 0.000 claims abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 238000005338 heat storage Methods 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 239000000470 constituent Substances 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 32
- 239000007789 gas Substances 0.000 description 28
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 14
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052644 β-spodumene Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はボイラ用空気予熱器ある
いは排煙処理用ガスガスヒータなどに用いられる再生式
熱交換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative heat exchanger used as an air preheater for a boiler or a gas gas heater for flue gas treatment.
【０００２】[0002]
【従来の技術】再生式熱交換器は伝熱エレメントを蓄熱
体として、一定時間ごとに高温気体と低温気体とを交互
に接触させることにより、高温気体の熱により低温気体
を加熱する装置である。このような再生式熱交換器の１
例としてボイラ用空気予熱器がある。従来使用されてい
るボイラ用空気予熱器の１例を図５および図６により簡
単に説明する。円筒状のロータ１は蓄熱体である伝熱エ
レメント集積層２を複数段内包し、軸受装置（図示せ
ず）により回転可能に保持され、駆動装置（図示せず）
により軸５を回転軸として回転される。それぞれの段の
伝熱エレメント集積層２は図６に示す伝熱エレメント板
９が、外板７よりなるバスケット内に収納された伝熱エ
レメント集積バスケット６を複数個並べて構成されてい
る。加熱気体であるボイラ排ガス３および被加熱気体で
ある空気４（低温気体）は接続ダクト（図示せず）によ
り各々別流路を形成し、この両気体は混合しないように
シール機構（図示せず）によりシールされている。ロー
タ１内の伝熱エレメントが高温気体（ボイラ排ガス３）
の流路中に曝されると、伝熱エレメントは高温気体によ
り加熱されて蓄熱し、ロータ１の回転により低温気体の
流路中に移動すると放熱して低温気体を加熱し、再びロ
ータ１の回転により高温気体の流路中に移動する。この
操作を連続して繰り返すことによりボイラ排ガス３は冷
却され、空気４は加熱される。2. Description of the Related Art A regenerative heat exchanger is a device for heating a low-temperature gas by the heat of the high-temperature gas by alternately contacting the high-temperature gas and the low-temperature gas with a heat transfer element as a heat storage body at regular intervals. . One of such regenerative heat exchangers
An example is an air preheater for boilers. An example of a conventional boiler air preheater will be briefly described with reference to FIGS. 5 and 6. The cylindrical rotor 1 includes a plurality of heat transfer element integrated layers 2 that are heat storage bodies, is rotatably held by a bearing device (not shown), and is driven by a drive device (not shown).
Thus, the shaft 5 is rotated about the axis of rotation. The heat transfer element integrated layer 2 of each stage is configured by arranging a plurality of heat transfer element integrated baskets 6 housed in a basket formed of an outer plate 7 and a heat transfer element plate 9 shown in FIG. Boiler exhaust gas 3 which is a heating gas and air 4 (low temperature gas) which is a gas to be heated form separate flow paths by connecting ducts (not shown), and a sealing mechanism (not shown) is provided to prevent these gases from being mixed. ) Is sealed by. The heat transfer element in the rotor 1 is a high temperature gas (boiler exhaust gas 3)
When exposed to the flow path of the heat transfer element, the heat transfer element is heated by the high temperature gas and stores heat. When the rotor 1 rotates to move into the flow path of the low temperature gas, the heat is dissipated to heat the low temperature gas, and the rotor 1 is again heated. It moves into the flow path of high temperature gas by rotation. By repeating this operation continuously, the boiler exhaust gas 3 is cooled and the air 4 is heated.
【０００３】伝熱エレメント集積層２中の伝熱エレメン
ト板９の材質としては、通常高温気体が流入する側には
軟鋼を、各伝熱エレメント集積層を通過した高温気体が
流出する側には耐蝕鋼が使用されている。また、高温気
体が流出する側にはエナメル被覆鋼が使用されることも
ある。As the material of the heat transfer element plate 9 in the heat transfer element integrated layer 2, a mild steel is usually used on the side where high temperature gas flows in, and a material on the side where high temperature gas that has passed through each heat transfer element integrated layer flows out. Corrosion resistant steel is used. Further, enamel-coated steel may be used on the side where the high temperature gas flows out.
【０００４】[0004]
【発明が解決しようとする課題】再生式熱交換器の伝熱
エレメント材質として軟鋼あるいは耐蝕鋼を使用した場
合は、低温側では酸による腐食環境下にあるため寿命が
短くなる問題が生じ、高温側では高温気体上流の燃焼設
備（ボイラ等）の燃焼不良により発生する未燃物が伝熱
エレメント上に付着することにより火災が発生する恐れ
があるという問題がある。また、エナメル被覆鋼では、
高温側および／または低温側に設置され、空気や蒸気を
噴射することにより、伝熱エレメント表面に付着する灰
等を洗浄するために設けられるスーツブロア等の機械的
衝撃によりエナメル被覆層が損傷を受けることによる寿
命低下の問題が生じるうえに、前記火災の問題も解決さ
れない。When mild steel or corrosion resistant steel is used as the material of the heat transfer element of the regenerative heat exchanger, there is a problem that the service life is shortened due to the corrosive environment due to acid on the low temperature side, On the side, there is a problem that a fire may occur due to unburned substances generated due to poor combustion in the combustion equipment (boiler or the like) upstream of the high temperature gas, adhering to the heat transfer element. Also, with enamel coated steel,
The enamel coating layer may be damaged by mechanical impact of a suit blower installed on the high-temperature side and / or low-temperature side and spraying air or steam to clean ash etc. adhering to the surface of the heat transfer element. In addition to the problem of shortening the service life due to receiving, the problem of the fire cannot be solved.
【０００５】これらの問題を解決するために伝熱エレメ
ントの材料としてセラミックスを採用することも試みら
れている。この場合、熱交換器の構造上生じる周期的な
温度振幅あるいはスーツブロアによる熱衝撃に耐えると
いう目的からコージェライト、βースポジュメン等の低
熱膨張セラミックスを使用した例があるが、これらのセ
ラミックスは結晶中のアルカリ成分が硫酸に侵され損傷
するという欠点を有する。したがって、耐蝕性がよく、
実用的な耐熱衝撃性を有する伝熱エレメントの材料およ
び形状を開発する必要があった。本発明は、このような
従来技術の問題点を解決し、耐蝕性がよく、実用的な耐
熱衝撃性を有する伝熱エレメントを備えた再生式熱交換
器を提供することを目的とする。In order to solve these problems, it has been attempted to adopt ceramics as the material of the heat transfer element. In this case, there is an example in which low thermal expansion ceramics such as cordierite and β-spodumene are used for the purpose of withstanding the periodic temperature amplitude generated by the structure of the heat exchanger or the thermal shock due to the suit blower. It has a drawback that the alkaline component of the is damaged by sulfuric acid. Therefore, the corrosion resistance is good,
It was necessary to develop the material and shape of the heat transfer element having practical thermal shock resistance. SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a regenerative heat exchanger including a heat transfer element having good corrosion resistance and practical thermal shock resistance.
【０００６】[0006]
【課題を解決するための手段】本発明は（１）蓄熱体で
ある伝熱エレメントを有し、その伝熱エレメントが高温
気体と低温気体との間で交互に熱交換を繰り返す再生式
熱交換器であって、前記伝熱エレメントを集積した集積
層が気体の流れ方向に対し２層以上の層を形成する再生
式熱交換器において、少なくとも１層の集積層を構成す
る伝熱エレメントが、重量百分率で７５％以上のＳｉＯ
2 、２５％以下のＡｌ2 Ｏ3 、および合計量が１〜５％
のＫ2 Ｏおよび／またはＮａ2 Ｏを含有し、５０〜８０
重量％のガラス相と、２０〜５０重量％の結晶相からな
り、かつその結晶相の主組成が石英およびムライトであ
り結晶相の構成にアルカリ成分を含まないセラミックス
からなることを特徴とする再生式熱交換器、（２）セラ
ミックス製の伝熱エレメントの集積層を２層以上有する
前記再生式熱交換器であって、該伝熱エレメント集積層
が複数のセラミックス製伝熱エレメントハニカムブロッ
クを集積させた伝熱エレメント集積バスケットを並べて
構成されており、各ハニカムの壁面の肉厚が１．５ｍｍ
以下であることを特徴とする再生式熱交換器、（３）伝
熱エレメントを構成するセラミックスが２００℃／秒以
上の温度落差に耐えるセラミックスであることを特徴と
する前記の再生式熱交換器、である。The present invention (1) has a heat transfer element which is a heat storage body, and the heat transfer element repeats heat exchange alternately between a high temperature gas and a low temperature gas. A regenerative heat exchanger in which the integrated layer in which the heat transfer elements are integrated forms two or more layers in the gas flow direction, the heat transfer element forming at least one integrated layer, 75% or more of SiO by weight percentage
2 , Al 2 O 3 of 25% or less, and the total amount of 1 to 5%
Of K 2 O and / or Na 2 O of 50-80
Regeneration characterized by comprising a glass phase of 20% by weight and a crystal phase of 20 to 50% by weight, and the main composition of the crystal phase is quartz and mullite, and the composition of the crystal phase is a ceramic containing no alkali component Type heat exchanger, (2) The regenerative heat exchanger having two or more ceramic heat transfer element integrated layers, wherein the heat transfer element integrated layer integrates a plurality of ceramic heat transfer element honeycomb blocks. The heat transfer element accumulation baskets are arranged side by side, and the wall thickness of each honeycomb is 1.5 mm.
Regenerative heat exchanger characterized by the following: (3) The regenerative heat exchanger characterized in that the ceramic constituting the heat transfer element is a ceramic capable of withstanding a temperature drop of 200 ° C./sec or more. ,.
【０００７】[0007]
【作用】本発明の再生式熱交換器において伝熱エレメン
トを構成するセラミックスは、重量百分率で７５％以上
のＳｉＯ2 、２５％以下のＡｌ2 Ｏ3 、および合計量が
１〜５％のＫ2 Ｏおよび／またはＮａ2 Ｏを含有する。
ＳｉＯ2 量が７５％未満の場合には耐蝕性が低下する。
また、Ａｌ2 Ｏ3 が２５％を超えると結晶相中のムライ
ト結晶が多くなりすぎるため耐蝕性が低下するので好ま
しくない。Ｋ2 ＯやＮａ2 Ｏのアルカリ成分はガラス相
を形成させ、伝熱エレメントの表面を緻密化して吸水率
を低下させる目的で使用されるが、この量が５％を超え
ると耐硫酸性が低下するので好ましくない。本発明の再
生式熱交換器においては、セラミックス製の伝熱エレメ
ントが硫酸に強いガラス相と石英およびムライトを主成
分とする結晶相とで構成されているため、耐蝕性、耐熱
性が向上し、それによって低温部では寿命延長させ、高
温部においては火災の危険性を消滅させる効果をもたら
している。The ceramics constituting the heat transfer element in the regenerative heat exchanger of the present invention are composed of 75% by weight or more of SiO 2 , 25% or less of Al 2 O 3 , and K of 1 to 5% in total. It contains 2 O and / or Na 2 O.
If the amount of SiO 2 is less than 75%, the corrosion resistance decreases.
On the other hand, if Al 2 O 3 exceeds 25%, the amount of mullite crystals in the crystal phase becomes too large and the corrosion resistance decreases, which is not preferable. The alkaline component of K 2 O or Na 2 O is used for the purpose of forming a glass phase and densifying the surface of the heat transfer element to reduce the water absorption rate. If this amount exceeds 5%, the sulfuric acid resistance is increased. It is not preferable because it decreases. In the regenerative heat exchanger of the present invention, since the ceramic heat transfer element is composed of the glass phase resistant to sulfuric acid and the crystal phase containing quartz and mullite as the main components, the corrosion resistance and heat resistance are improved. By doing so, it has the effect of extending the service life in the low temperature part and extinguishing the risk of fire in the high temperature part.
【０００８】また、４角または台形断面のハニカムブロ
ックで構成した伝熱エレメントを適宜組み合わせて伝熱
エレメント集積バスケットを形成し、それらを並べて伝
熱エレメント集積層を組み立てるようにすれば、製造・
組み立てが容易である。さらに伝熱エレメント集積層を
構成するハニカムの壁面の肉厚を１．５ｍｍ以下と薄肉
にすることにより、伝熱効率および耐熱衝撃性をさらに
改良することができる。また、このように薄肉にするこ
とにより、圧力損失の増加も防ぐことができる。[0008] Further, if the heat transfer element integrated basket is formed by appropriately combining the heat transfer elements constituted by the honeycomb block having the square or trapezoidal cross section, and the heat transfer element integrated layer is assembled by assembling the heat transfer element integrated layer, the manufacturing
Easy to assemble. Further, by making the wall thickness of the honeycomb wall forming the heat transfer element integrated layer as thin as 1.5 mm or less, heat transfer efficiency and thermal shock resistance can be further improved. Also, by making the wall thin as described above, it is possible to prevent an increase in pressure loss.
【０００９】図１は本発明の再生式熱交換器の１実施態
様についてその回転体部分を示す概略断面図であり、図
１（ａ）は縦断面図、図１（ｂ）は図１（ａ）のＡ−Ａ
断面図である。なお、支持軸受装置、駆動装置、接続ダ
クトおよびシール装置などは図示されていない。この再
生式熱交換器の回転体は、円筒状のロータ１で構成され
ており、このロータ１は低温層、中温層および高温層の
伝熱エレメント集積層２−１、２−２および２−３を内
包している。この伝熱エレメント集積層は通常２〜４層
で構成されるが、本実施態様では３層で構成されたもの
を示している。このロータ１には、ボイラからの排ガス
３および空気９が互いに対向流に流れ込んでおり、この
両者間をロータ１が軸５を回転軸として回転することに
より熱交換を行っている。このため、図１の下側は上側
に比べ温度が低く、下から低温層２−１、中温層２−２
および高温層２−３と呼ばれる。FIG. 1 is a schematic sectional view showing a rotating body portion of an embodiment of a regenerative heat exchanger of the present invention. FIG. 1 (a) is a vertical sectional view and FIG. 1 (b) is FIG. a) A-A
FIG. It should be noted that the supporting bearing device, the driving device, the connecting duct, the sealing device and the like are not shown. The rotating body of this regenerative heat exchanger is composed of a cylindrical rotor 1, and this rotor 1 includes heat transfer element integrated layers 2-1 2-2 and 2-of low temperature layer, medium temperature layer and high temperature layer. 3 is included. This heat transfer element integrated layer is usually composed of 2 to 4 layers, but in this embodiment, it is shown to be composed of 3 layers. Exhaust gas 3 from the boiler and air 9 flow into the rotor 1 in counterflows with each other, and the rotor 1 rotates about a shaft 5 as a rotating shaft to exchange heat between them. Therefore, the temperature of the lower side of FIG. 1 is lower than that of the upper side, and the low temperature layer 2-1 and the medium temperature layer 2-2 are arranged from the bottom.
And high temperature layer 2-3.
【００１０】図２はセラミックス製伝熱エレメント集積
バスケット６を示しており、これを複数個並べることに
より伝熱エレメント集積層２−１、２−２、２−３が形
成される。本実施態様ではこれらの３層ともセラミック
ス製伝熱エレメント集積バスケット６により構成されて
いる。セラミックス製伝熱エレメント集積バスケット６
は外板７およびセラミックス製伝熱エレメントブロック
８−１および８−２により構成されている。図３及び図
４はそれぞれ断面台形のセラミックス製伝熱エレメント
ブロック８−１および断面長方形のセラミックス製伝熱
エレメントブロック８−２の拡大図である。この両者を
適宜組み合わせて伝熱エレメント集積バスケット６を形
成していく。FIG. 2 shows a heat transfer element integrated basket 6 made of ceramics. By arranging a plurality of the heat transfer element integrated baskets 6, heat transfer element integrated layers 2-1, 2-2, 2-3 are formed. In this embodiment, these three layers are all made of a ceramic heat transfer element integrated basket 6. Ceramic heat transfer element integrated basket 6
Is composed of an outer plate 7 and ceramic heat transfer element blocks 8-1 and 8-2. 3 and 4 are enlarged views of a ceramic heat transfer element block 8-1 having a trapezoidal cross section and a ceramic heat transfer element block 8-2 having a rectangular cross section, respectively. The both are appropriately combined to form the heat transfer element accumulating basket 6.
【００１１】本発明の熱交換器で使用されるセラミック
ス製伝熱エレメントブロックは石英、アルミナ、ムライ
ト、長石、陶石、粘土等を所定の割合に配合した原料に
水を加えてハニカム形状に押し出し成形し、乾燥、焼成
過程を経て製造される。The heat transfer element block made of ceramics used in the heat exchanger of the present invention is extruded into a honeycomb shape by adding water to a raw material prepared by mixing quartz, alumina, mullite, feldspar, porcelain stone, clay and the like in a predetermined ratio. It is manufactured through molding, drying and firing.
【００１２】この種の熱交換器の伝熱エレメントに加わ
る温度落差（試料に作用する温度変化の大きさ）は、通
常次のようになっている。すなわち、この種の熱交換器
が使用される一般的な例において、排ガス入口温度は３
９０℃、空気出口温度は３３０℃であり、高温側の平均
温度は約３６０℃である。一方排ガス出口温度は１８０
℃、空気入口温度は８０℃であり、低温側の平均温度は
約１３０℃である。ロータの回転数は４ｒｐｍ程度と非
常にゆっくりと回転するため、定常運転での回転に伴う
温度振幅による温度落差は問題にならない。この場合ス
ーツブロアが設置されているとこのスーツブロアによる
温度落差が問題となる。スーツブロアが高温側に設置さ
れている場合、スーツブロア噴射媒体は通常空気であ
り、空気により伝熱エレメントが冷却されることにな
り、この冷却速度は約１５０℃／秒となる。これに対
し、本発明のセラミックス製伝熱エレメントは２００℃
／秒の冷却速度でも損傷することはなく実用的な耐熱衝
撃性を有している。The temperature drop (magnitude of temperature change acting on the sample) applied to the heat transfer element of this type of heat exchanger is usually as follows. That is, in a general example where this type of heat exchanger is used, the exhaust gas inlet temperature is 3
90 ° C., the air outlet temperature is 330 ° C., and the average temperature on the high temperature side is about 360 ° C. On the other hand, the exhaust gas outlet temperature is 180
C., the air inlet temperature is 80.degree. C., and the average temperature on the low temperature side is about 130.degree. Since the rotation speed of the rotor is about 4 rpm, which is very slow, the temperature drop due to the temperature amplitude due to the rotation in the steady operation does not matter. In this case, if a suit blower is installed, the temperature drop due to this suit blower becomes a problem. When the suit blower is installed on the high temperature side, the suit blower jet medium is usually air, and the heat transfer element is cooled by the air, and the cooling rate is about 150 ° C./sec. On the other hand, the ceramic heat transfer element of the present invention is 200 ° C.
It has practical thermal shock resistance without being damaged even at a cooling rate of / sec.
【００１３】各伝熱エレメントを構成するハニカムの肉
厚については、低温層は、灰等が付着しやすく、高温層
は灰等が付着しにくいという周囲環境を考慮し、通常は
低温層ハニカムピッチを大きくし、高温層はハニカムピ
ッチを小さくする。強度上はハニカムの肉厚が大である
方が有利であるが、一方圧力損失を考慮すればハニカム
肉厚は薄い方が望ましい。その両者を考慮し、本発明で
使用するセラミックスの物性値や伝熱エレメントの伝
熱、圧力損失特性等から実用的なハニカム肉厚を計算す
ると、高温層で約０．８ｍｍ、低温層で約１．３ｍｍ、
となる。条件が整えば低温層ハニカム肉厚は約１．５ｍ
ｍ、高温層ハニカム肉厚は約１．０ｍｍ程度までは許容
できるが、それ以上の肉厚では圧力損失が大きくなるの
で実用的でない。Regarding the wall thickness of the honeycomb constituting each heat transfer element, in consideration of the surrounding environment in which ash or the like easily adheres to the low temperature layer and ash or the like does not easily adhere to the high temperature layer, the low temperature layer honeycomb pitch is usually used. And the high temperature layer reduces the honeycomb pitch. In terms of strength, it is advantageous that the thickness of the honeycomb is large, but in consideration of the pressure loss, it is desirable that the thickness of the honeycomb is thin. Considering both of them, when calculating the practical honeycomb wall thickness from the physical property values of the ceramics used in the present invention, heat transfer of the heat transfer element, pressure loss characteristics, etc., it is about 0.8 mm in the high temperature layer and about 1.3 mm,
Becomes If the conditions are adjusted, the thickness of the low temperature layer honeycomb will be about 1.5m.
m, the thickness of the high temperature layer honeycomb is acceptable up to about 1.0 mm, but if the thickness is more than that, the pressure loss becomes large, which is not practical.
【００１４】[0014]
【実施例】以下実施例により本発明をさらに具体的に説
明する。成分比の異なる４種類のセラミックスを用いて
ハニカムブロックを作製し、耐硫酸性および耐熱衝撃性
を試験した結果を表１に示す。なお、表中の化学成分組
成の合計量が１００％に達していない部分は表示成分以
外の不純物である。また、ガラス相の割合はＸ線回折試
験によるＸ線ピーク強度から求めた。耐硫酸性は、試料
を６０％硫酸中で９６時間煮沸後の重量減量を測定し、
そのときの重量減少率で示した。また、耐熱衝撃性の試
験は、ハニカムブロックを均一に加熱したのち、空気を
噴き付け、短時間で急激に冷却する方法で行った。表１
の結果から、試験例１〜４はいずれも良好な耐硫酸性を
示しているが、Ａｌ2 Ｏ3 の量が増加すると重量減量率
も増加する傾向を示し、Ａｌ2 Ｏ3 含有量が多く、ガラ
ス相の割合が本発明の範囲外となる試験例４では重量減
量率が大きく、やや実用性に難があることがわかる。The present invention will be described in more detail with reference to the following examples. Table 1 shows the results of a sulfuric acid resistance and a thermal shock resistance tested by making a honeycomb block using four types of ceramics having different component ratios. In the table, the portions where the total chemical composition does not reach 100% are impurities other than the indicated components. Further, the proportion of the glass phase was determined from the X-ray peak intensity in the X-ray diffraction test. Sulfuric acid resistance is measured by weight loss after boiling a sample in 60% sulfuric acid for 96 hours,
The weight reduction rate at that time is shown. The thermal shock resistance test was carried out by uniformly heating the honeycomb block, then blowing air and rapidly cooling it in a short time. Table 1
From the results, all of Test Examples 1 to 4 show good sulfuric acid resistance, but when the amount of Al 2 O 3 increases, the weight loss rate also tends to increase, and the Al 2 O 3 content is high. In Test Example 4 in which the proportion of the glass phase was outside the range of the present invention, it was found that the weight loss rate was large and the practicality was somewhat difficult.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明の再生式熱交換器は特定の化学組
成および結晶相とガラス相との割合を制御したセラミッ
クス製の伝熱エレメントを使用することにより、耐蝕
性、耐久性に優れ、火災が発生しにくいという極めて実
用性の高い特性を有している。さらにその構造から、製
造・組み立てが容易で、スーツブロアの使用による付着
灰による閉塞の危険性も少なく、運転上あるいは防災上
極めて安全でかつ経済的な再生式熱交換器である。EFFECT OF THE INVENTION The regenerative heat exchanger of the present invention has excellent corrosion resistance and durability by using a ceramic heat transfer element having a specific chemical composition and a controlled ratio of crystal phase and glass phase. It has a very practical property that fire hardly occurs. Furthermore, due to its structure, it is a regenerative heat exchanger that is easy to manufacture and assemble, has a low risk of blockage due to adhered ash due to the use of suit blowers, is extremely safe in operation and disaster prevention, and is economical.
【図１】本発明の実施例に係る再生式熱交換器の回転体
の概略断面図。FIG. 1 is a schematic sectional view of a rotating body of a regenerative heat exchanger according to an embodiment of the present invention.
【図２】伝熱エレメント集積バスケットの斜視図。FIG. 2 is a perspective view of a heat transfer element collecting basket.
【図３】断面台形の伝熱エレメントブロックの拡大斜視
図。FIG. 3 is an enlarged perspective view of a heat transfer element block having a trapezoidal cross section.
【図４】断面長方形の伝熱エレメントブロックの拡大斜
視図。FIG. 4 is an enlarged perspective view of a heat transfer element block having a rectangular cross section.
【図５】従来のボイラ用空気予熱器の１例を示す概略断
面図。FIG. 5 is a schematic sectional view showing an example of a conventional boiler air preheater.
【図６】図５の空気予熱器に使用される伝熱エレメント
集積バスケットの斜視図。6 is a perspective view of a heat transfer element integrated basket used in the air preheater of FIG. 5. FIG.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 角田 英雄 長崎県長崎市深堀町五丁目717番１号 三 菱重工業株式会社長崎研究所内 (72)発明者 深川 雅幸 長崎県長崎市深堀町五丁目717番１号 三 菱重工業株式会社長崎研究所内 (72)発明者 中村 利治 佐賀県西松浦郡有田町1288番地 岩尾磁器 工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Tsunoda 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Ltd. Nagasaki Research Institute (72) Inventor Masayuki Fukagawa 717, Fukahori-cho, Nagasaki-shi, Nagasaki Prefecture No. 1 Sanritsu Heavy Industries Co., Ltd. Nagasaki Research Institute (72) Inventor Toshiharu Nakamura 1288 Arita-cho, Nishimatsuura-gun, Saga Iwao Porcelain Industry Co., Ltd.
Claims (3)
の伝熱エレメントが高温気体と低温気体との間で交互に
熱交換を繰り返す再生式熱交換器であって、前記伝熱エ
レメントを集積した集積層が気体の流れ方向に対し２層
以上の層を形成する再生式熱交換器において、少なくと
も１層の集積層を構成する伝熱エレメントが、重量百分
率で７５％以上のＳｉＯ2 、２５％以下のＡｌ2 Ｏ3 、
および合計量が１〜５％のＫ2 Ｏおよび／またはＮａ2
Ｏを含有し、５０〜８０重量％のガラス相と、２０〜５
０重量％の結晶相からなり、かつその結晶相の主組成が
石英およびムライトであり結晶相の構成にアルカリ成分
を含まないセラミックスからなることを特徴とする再生
式熱交換器。1. A regenerative heat exchanger having a heat transfer element which is a heat storage body, the heat transfer element repeating heat exchange alternately between a high temperature gas and a low temperature gas, the heat transfer element comprising: In a regenerative heat exchanger in which the integrated layers formed form two or more layers in the gas flow direction, the heat transfer element constituting at least one integrated layer has a weight percentage of 75% or more of SiO 2 , 25% or less of Al 2 O 3 ,
And K 2 O and / or Na 2 in a total amount of 1-5%
O, containing 50-80% by weight of glass phase and 20-5
A regenerative heat exchanger comprising 0% by weight of a crystal phase, the main composition of the crystal phase being quartz and mullite, and a ceramic containing no alkali component in the composition of the crystal phase.
層を２層以上有する請求項１に記載の再生式熱交換器で
あって、該伝熱エレメント集積層が複数のセラミックス
製伝熱エレメントハニカムブロックを集積させた伝熱エ
レメント集積バスケットを並べて構成されており、各ハ
ニカムの壁面の肉厚が１．５ｍｍ以下であることを特徴
とする再生式熱交換器。2. The regenerative heat exchanger according to claim 1, comprising two or more ceramic heat transfer element integrated layers, wherein the heat transfer element integrated layers are a plurality of ceramic heat transfer element honeycomb blocks. A regenerative heat exchanger, characterized in that the heat transfer element accumulating baskets in which the above are accumulated are arranged side by side, and the wall thickness of each honeycomb is 1.5 mm or less.
が２００℃／秒以上の温度落差に耐えるセラミックスで
あることを特徴とする請求項１または２に記載の再生式
熱交換器。3. The regenerative heat exchanger according to claim 1, wherein the ceramic constituting the heat transfer element is a ceramic capable of withstanding a temperature drop of 200 ° C./sec or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20066693A JP3422527B2 (en) | 1993-08-12 | 1993-08-12 | Regenerative heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20066693A JP3422527B2 (en) | 1993-08-12 | 1993-08-12 | Regenerative heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0755375A true JPH0755375A (en) | 1995-03-03 |
| JP3422527B2 JP3422527B2 (en) | 2003-06-30 |
Family
ID=16428213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20066693A Expired - Lifetime JP3422527B2 (en) | 1993-08-12 | 1993-08-12 | Regenerative heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3422527B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940275A (en) * | 2013-01-18 | 2014-07-23 | 北京神雾环境能源科技集团股份有限公司 | Gas heat exchanger and gas heat exchange system with same |
-
1993
- 1993-08-12 JP JP20066693A patent/JP3422527B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940275A (en) * | 2013-01-18 | 2014-07-23 | 北京神雾环境能源科技集团股份有限公司 | Gas heat exchanger and gas heat exchange system with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3422527B2 (en) | 2003-06-30 |
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