JP2007040335A - Metal-coated heat insulating material - Google Patents
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- JP2007040335A JP2007040335A JP2005222944A JP2005222944A JP2007040335A JP 2007040335 A JP2007040335 A JP 2007040335A JP 2005222944 A JP2005222944 A JP 2005222944A JP 2005222944 A JP2005222944 A JP 2005222944A JP 2007040335 A JP2007040335 A JP 2007040335A
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Abstract
Description
本発明は、各種配管設備、特に、原子力発電プラントの配管や機器等の配管設備を断熱被覆するための金属被覆断熱保温材に関するものである。 The present invention relates to a metal-coated heat insulation material for heat-insulating various piping facilities, particularly piping facilities such as piping and equipment of nuclear power plants.
従来、原子力発電プラントにおいては、原子炉から延出するように配管された配管や、付設されている各種機器等は断熱保温材により被覆されている。また、特許文献１には、金属製ケースの内部に多数の金属薄板が積層状に充填配置される金属反射型保温装置において、前記金属薄板に、格子状に型押しされたリブと、前記格子状リブで区画される面部分にあって、金属薄板間で異なる位相部位に前記リブより高く型押しされた突起とが設けられ、金属薄板は前記突起高さで規制される間隔をとって積層されていることを特徴とする金属反射型保温装置が開示されている。また、特許文献２には、断熱保温すべき配管や機器の外側に、軸方向および周方向に複数個に分割された保温体を配置し、かつ該保温体の周方向接合部の１つが配管の頂上部に位置するように配置し、前記接合部の周方向両側に変形防止用金属板を取り付けて成ることを特徴とする断熱保温装置が開示されている。また、特許文献２の［００１３］段落には、保温体として、金属薄板を層状に積層しケース状の金属板で覆ってなる金属保温材、ロックウール等の繊維質保温材や、シリカ、珪酸カルシウム等の成形保温材を金属ケースで被覆してなる金属被覆保温材が開示されている。 2. Description of the Related Art Conventionally, in a nuclear power plant, piping that is extended from a nuclear reactor and various attached devices are covered with a heat insulating and heat insulating material. Further, in Patent Document 1, in a metal reflection type heat insulating device in which a large number of thin metal plates are filled and arranged inside a metal case, ribs embossed in a lattice shape on the thin metal plate, and the lattice And a protrusion that is embossed higher than the rib at a phase portion that is different between the thin metal plates, and the thin metal plate is stacked with an interval regulated by the height of the protrusion. A metal reflection type heat retaining device is disclosed. Further, in Patent Document 2, a heat insulating body divided into a plurality of parts in the axial direction and the circumferential direction is arranged outside a pipe and equipment to be insulated and heat-insulated, and one of the circumferential joints of the heat insulating body is a pipe. There is disclosed a heat insulation and heat retention device that is arranged so as to be positioned at the top of the joint and is provided with metal plates for preventing deformation on both sides in the circumferential direction of the joint. [0013] In paragraph [0013] of Patent Document 2, as a heat insulator, a metal heat insulating material in which metal thin plates are laminated in layers and covered with a case-shaped metal plate, a fiber heat insulating material such as rock wool, silica, silicic acid, etc. A metal-coated heat insulating material obtained by coating a molded heat insulating material such as calcium with a metal case is disclosed.
上述のような保温材のうち、金属薄板を積層してなる金属製保温材は、加工が難しく、また、費用も掛る。また、珪酸カルシウムを使用した金属被覆保温材は、珪酸カルシウムの加工が難しく、複雑な形状のものに精度良く適応させることが困難であった。 Among the heat insulating materials as described above, a metal heat insulating material formed by laminating metal thin plates is difficult to process and costs high. Moreover, the metal-coated heat insulating material using calcium silicate is difficult to process calcium silicate, and it has been difficult to accurately adapt to a complicated shape.
そこで、従来、ロックウールを使用した保温材が多用されている。ところが、配管破断による原子炉冷却材喪失事故［原子炉に繋がっている配管の破断等により原子炉内の冷却材（炉水）が流出する事象］時には、原子炉に注水するため非常用炉心冷却系統ポンプが自動起動し原子炉に注水されるが、水源であるサプレッションプールに異物が存在して該ポンプに吸い込まれてポンプ等に悪影響を与えることがあるため、サプレッションプールの該ポンプへの吸い込み口には非常用炉心冷却系統ストレーナ（金網）が設置されている。配管が破断すると、保温材に使用されているロックウールも破損して飛散し、サプレッションプール中の水に混入し、非常用炉心冷却系統ストレーナの目詰まりの原因となることが考えられる。非常用炉心冷却系統ストレーナが目詰まりを起こすと、該ポンプの吸水圧力が低下して該ポンプを停止させなければならない事態を生ずる。ここで、非常用炉心冷却系統ストレーナは、サプレッションプール中の水位の中程に設置されており、該ポンプを停止することにより非常用炉心冷却系統ストレーナに吸引されたロックウール等をサプレッションプールの底部に落下させ、それによって該ポンプを再稼働させることができる構成となっている。 Therefore, conventionally, a heat insulating material using rock wool is frequently used. However, in the event of a loss of reactor coolant due to a pipe rupture [an event where coolant in the reactor (reactor water) flows out due to a rupture of a pipe connected to the reactor, etc.] The system pump is automatically started and water is injected into the reactor, but foreign matter is present in the suppression pool that is the water source and may be sucked into the pump, which may adversely affect the pump. An emergency core cooling system strainer (wire mesh) is installed at the mouth. When the pipe breaks, the rock wool used for the heat insulating material is also broken and scattered and mixed into the water in the suppression pool, which may cause clogging of the emergency core cooling system strainer. When the emergency core cooling system strainer becomes clogged, the water absorption pressure of the pump is lowered and the pump must be stopped. Here, the emergency core cooling system strainer is installed in the middle of the water level in the suppression pool, and the rock wool or the like sucked into the emergency core cooling system strainer by stopping the pump is removed at the bottom of the suppression pool. The pump can be re-operated by dropping it.
従って、本発明の目的は、配管破断による非常用炉心冷却系統ポンプ作動時に、配管破断に伴う保温材の破壊屑等が非常用炉心冷却系統ストレーナの目詰まりを起し、非常用炉心冷却系統ポンプ停止の原因となることがない金属被覆断熱保温材を提供することにある。 Accordingly, an object of the present invention is to provide an emergency core cooling system pump that is caused by clogging of the emergency core cooling system strainer due to the debris of the thermal insulation material accompanying the pipe rupture when the emergency core cooling system pump is operated due to the pipe rupture. An object of the present invention is to provide a metal-coated heat insulation material that does not cause a stoppage.
即ち、本発明は、配管設備を断熱保温するための保温材及び該保温材を被覆するための金属被覆材より構成される金属被覆断熱保温材において、前記保温材が樹脂系発泡体または無機系多孔体より構成されることを特徴とする金属被覆断熱保温材を提供することにある。 That is, the present invention is a metal-coated heat insulating heat insulating material composed of a heat insulating material for heat insulating and maintaining piping equipment and a metal coating material for covering the heat insulating material, wherein the heat insulating material is a resin-based foam or an inorganic material. An object of the present invention is to provide a metal-coated heat insulating heat insulating material characterized by comprising a porous body.
また、本発明の金属被覆断熱保温材は、配管設備が原子力発電プラントの配管設備であることを特徴とする。 Moreover, the metal-coated heat insulation material of the present invention is characterized in that the piping facility is a piping facility of a nuclear power plant.
更に、本発明の金属被覆断熱保温材は、樹脂系発泡体がシリコーンフォーム及び／またはポリイミドフォームであることを特徴とする。 Furthermore, the metal-coated heat insulation material of the present invention is characterized in that the resin-based foam is a silicone foam and / or a polyimide foam.
更に、本発明の金属被覆断熱保温材は、無機系多孔体がフォームグラス、パーライト系多孔体及び／または珪酸カルシウム系多孔体であることを特徴とする。 Furthermore, the metal-coated heat insulation material of the present invention is characterized in that the inorganic porous material is foam glass, pearlite porous material, and / or calcium silicate porous material.
また、本発明の金属被覆断熱保温材は、無機質多孔体が、非晶質珪酸、補強繊維及び充填材を含有する原料を成形し硬化させてなる多孔質成形体であって、前記原料にアルカリ金属化合物を含有するｐＨ８〜１３の水溶液又は水分散液を添加し、加熱することなく硬化させてなる多孔質成形体であることを特徴とする。 Further, the metal-coated heat insulation material of the present invention is a porous molded body in which an inorganic porous body is formed and cured from a raw material containing amorphous silicic acid, reinforcing fibers, and a filler. A porous molded body obtained by adding an aqueous solution or aqueous dispersion containing a metal compound and having a pH of 8 to 13 and curing without heating.
本発明によれば、保温材として使用される樹脂系発泡体や無機系多孔体の比重が水よりも軽いため、配管破断による非常用炉心冷却系統ポンプ作動時に、配管破断に伴い発生する保温材の破壊屑等がサプレッションプールの水中に沈降することなく、水面を浮遊し、それによって非常用炉心冷却系統ストレーナの目詰まりを起し、非常用炉心冷却系統ポンプ停止の原因となることがない金属被覆断熱保温材を提供することができるという効果を奏するものである。 According to the present invention, since the specific gravity of the resin-based foam or inorganic porous material used as the heat insulating material is lighter than water, the heat insulating material generated along with the pipe rupture during the operation of the emergency core cooling system pump due to the pipe rupture Metal that will not cause sedimentation of the emergency core cooling system pump due to flotation of the emergency core cooling system strainer due to floating of the water surface without causing debris from sinking into the water of the suppression pool An effect that a covering heat insulation material can be provided is produced.
本発明の金属被覆断熱保温材は、各種配管設備を保温するための保温材及び該保温材を被覆するための金属被覆材より構成されるもので、前記保温材として樹脂系発泡体または無機系多孔体を使用することを特徴とするものである。 The metal-coated heat insulation material of the present invention is composed of a heat insulation material for keeping various piping facilities warm and a metal coating material for covering the heat insulation material, and the resin insulation foam or inorganic type as the heat insulation material. A porous body is used.
ここで、樹脂系発泡体としては、例えばポリイミドフォーム、シリコーンフォーム等を使用することができる。ポリイミドフォームは、主成分がポリイミド樹脂から構成されるもので、密度４〜１０ｋｇ／ｍ３、最高連続使用温度３００℃、熱伝導率０．０４６Ｗ／ｍＫを有するものである。また、シリコーンフォームは、主成分がシリコーンゴムから構成されるもので、密度２７０〜３３０ｋｇ／ｍ３、最高連続使用温度１５０℃、熱伝導率０．０３６Ｗ／ｍＫを有するものである。 Here, as a resin-type foam, a polyimide foam, a silicone foam, etc. can be used, for example. The polyimide foam is composed mainly of a polyimide resin, and has a density of 4 to 10 kg / m 3 , a maximum continuous use temperature of 300 ° C., and a thermal conductivity of 0.046 W / mK. The silicone foam is composed mainly of silicone rubber, and has a density of 270 to 330 kg / m 3 , a maximum continuous use temperature of 150 ° C., and a thermal conductivity of 0.036 W / mK.
また、無機系多孔体としては、フォームグラス、パーライト系多孔体、珪酸カルシウム系多孔体等を使用することができる。フォームグラスは、主成分がガラスから構成されるもので、密度１００〜１５０ｋｇ／ｍ３、最高連続使用温度４００℃、熱伝導率０．０３６Ｗ／ｍＫを有するものであります。また、パーライト系多孔体は、パーライト粉末に少量の水ガラス又はコロイダルシリカを添加してなる混練物を所定形状の型枠に流し込むことにより得られるもので、密度２００〜３５０ｋｇ／ｍ３、最高連続使用温度５００℃を有するものである。更に、珪酸カルシウム系多孔体は、珪酸カルシウム粉末に少量の水ガラス又はコロイダルを添加してなる混練物を所定形状の型枠に流し込むことにより得られるもので、密度２００〜３５０ｋｇ／ｍ３、最高連続使用温度５００℃を有するものである。 In addition, as the inorganic porous material, foam glass, pearlite porous material, calcium silicate porous material, or the like can be used. Foam glass is composed mainly of glass, and has a density of 100 to 150 kg / m 3 , a maximum continuous use temperature of 400 ° C., and a thermal conductivity of 0.036 W / mK. Further, the pearlite porous body is obtained by pouring a kneaded material obtained by adding a small amount of water glass or colloidal silica into pearlite powder into a mold having a predetermined shape, and has a density of 200 to 350 kg / m 3 and the highest continuous. It has an operating temperature of 500 ° C. Further, the calcium silicate based porous material is obtained by pouring a kneaded material obtained by adding a small amount of water glass or colloidal into calcium silicate powder into a mold having a predetermined shape, and has a density of 200 to 350 kg / m 3 , the highest. It has a continuous use temperature of 500 ° C.
また、本発明の金属被覆断熱保温材を原子力発電プラント以外の用途に使用する場合には、無機質多孔体として、非晶質珪酸、補強繊維及び充填材を含有する原料を成形し硬化させてなる多孔質成形体であって、前記原料にアルカリ金属化合物を含有するｐＨ８〜１３の水溶液又は水分散液を添加し、加熱することなく硬化させてなる多孔質成形体を無機質多孔体として使用することもできる。この多孔質成形体は、非晶質珪酸、補強繊維、充填材及びアルカリ金属化合物を含有するｐＨ８〜１３の水溶液又は水分散液が混合されたスラリーを脱水成形し、加熱することなく、例えば５〜４０℃の硬化温度で硬化させることにより得ることができる。なお、アルカリ金属化合物を含有する水溶液又は水分散液は、アルカリ金属水酸化物水溶液又は水に接する表面の一部又は全部がＳｉ−ＯＭ（Ｍ：アルカリ金属）に置換しているアルカリ金属処理非晶質珪酸を含む水分散液であることができる。この多孔質成形体は、密度２００〜５００ｋｇ／ｍ３、最高連続使用温度９００℃を有するものである。なお、この多孔質成形体は、本願出願人により特願平２００５−１９８４７８号として既に提案されている。 In addition, when the metal-coated heat insulating and heat-insulating material of the present invention is used for applications other than nuclear power plants, a raw material containing amorphous silicic acid, reinforcing fibers and a filler is molded and cured as an inorganic porous body. A porous molded body obtained by adding a pH 8-13 aqueous solution or aqueous dispersion containing an alkali metal compound to the raw material and curing it without heating is used as the inorganic porous body. You can also. This porous molded body is formed by dehydrating a slurry in which an aqueous solution or aqueous dispersion having a pH of 8 to 13 containing amorphous silicic acid, reinforcing fibers, a filler, and an alkali metal compound is mixed and heated, for example, 5 It can be obtained by curing at a curing temperature of ˜40 ° C. Note that the aqueous solution or aqueous dispersion containing the alkali metal compound is an alkali metal treated non-aqueous solution in which part or all of the surface in contact with the alkali metal hydroxide aqueous solution or water is replaced by Si-OM (M: alkali metal). It can be an aqueous dispersion containing crystalline silicic acid. This porous molded body has a density of 200 to 500 kg / m 3 and a maximum continuous use temperature of 900 ° C. This porous molded body has already been proposed as Japanese Patent Application No. 2005-198478 by the present applicant.
なお、原子力発電プラントの配管設備に断熱保温材を施工するに際して、保温材は予め所定の寸法、形状とした成形体として施工現場に搬入するのが普通であり、例えば、保温材を構成する上記材質の中で、ポリイミドフォーム、シリコーンフォーム及びフォームグラスは、予めブロック形状の成形体を作製し、この成形体から所定の寸法、形状に切断加工することにより保温材とすることができる。また、シリコーンフォーム、パーライト系多孔体、珪酸カルシウム系多孔体は、所定の寸法、形状の型枠に流し込み、硬化させることにより保温材とすることができる。なお、ポリイミドフォームを切断加工するに際しては、加熱時の収縮を考慮して所定寸法よりも若干大きくすることが好ましい。 In addition, when constructing the heat insulating heat insulating material in the piping facility of the nuclear power plant, the heat insulating material is usually carried into the construction site as a molded body having a predetermined size and shape in advance, for example, the above-mentioned heat insulating material Among the materials, polyimide foam, silicone foam, and foam glass can be used as a heat insulating material by preparing a block-shaped molded body in advance and cutting the molded body into predetermined dimensions and shapes. Moreover, a silicone foam, a pearlite type porous body, and a calcium silicate type porous body can be made into a heat insulating material by pouring into a formwork of a predetermined size and shape and curing. When cutting the polyimide foam, it is preferable to make it slightly larger than the predetermined dimension in consideration of shrinkage during heating.
なお、本発明の金属被覆断熱保温材において、金属被覆材の形状、構成等は特に限定されるものではなく、現在保温材としてロックウールを使用している金属被覆断熱保温材における金属被覆材の構成と同様のものを使用することができ、例えばステンレス鋼板、アルミニウム板等から構成することができる。 In the metal-coated heat insulation material of the present invention, the shape and configuration of the metal coating material are not particularly limited, and the metal coating material in the metal-coated heat insulation material currently using rock wool as the heat insulation material. The thing similar to a structure can be used, for example, can comprise from a stainless steel plate, an aluminum plate, etc.
実施例１
ステンレス鋼板を用いて、内寸１００ｍｍ×５００ｍｍ×５００ｍｍのボックスを作製した。次に、ポリイミドフォーム（密度６ｋｇ／ｍ３）から１０５ｍｍ×５３０ｍｍ×５３０ｍｍの保温材を切り出し、得られた保温材をボックスの内部へ、ボックスの開口部から装填した。次に、ボックスの開口部へステンレス鋼板製の外装板をリベットにより取り付けることにより本発明の金属被覆断熱保温材を得た。
Example 1
Using a stainless steel plate, a box with an inner size of 100 mm × 500 mm × 500 mm was produced. Next, a 105 mm × 530 mm × 530 mm heat insulating material was cut out from the polyimide foam (density 6 kg / m 3 ), and the obtained heat insulating material was loaded into the box from the opening of the box. Next, a metal-coated heat insulating heat insulating material of the present invention was obtained by attaching a stainless steel outer plate to the opening of the box with rivets.
実施例２
まず、ステンレス鋼板を用いて、内寸１００ｍｍ×５００ｍｍ×５００ｍｍのボックスを作製した。次に、シリコーンフォームを構成する主剤及び硬化剤をよく混合した混合した物をボックスの内部へ、ボックスの開口部から注入し、硬化させることにより保温材（密度３００ｋｇ／ｍ３）を得た。次に、ボックスの開口部へステンレス鋼板製の外装板をリベットにより取り付けることにより本発明の金属被覆断熱保温材を得た。
Example 2
First, a box having an inner size of 100 mm × 500 mm × 500 mm was prepared using a stainless steel plate. Next, a mixed material in which the main agent and the curing agent constituting the silicone foam were well mixed was poured into the inside of the box from the opening of the box and cured to obtain a heat insulating material (density 300 kg / m 3 ). Next, a metal-coated heat insulating heat insulating material of the present invention was obtained by attaching a stainless steel outer plate to the opening of the box with rivets.
実施例３
パーライト粉末９０質量％及び水ガラス１０質量％よりなる混合物をボックスの内部へ、ボックスの開口部から注入し、硬化させることにより保温材（密度２５０ｋｇ／ｍ３）を得た以外は、実施例２と同様にして本発明の金属被覆断熱保温材を得た。
Example 3
Example 2 Except that a heat insulating material (density 250 kg / m 3 ) was obtained by pouring a mixture of 90% by weight of pearlite powder and 10% by weight of water glass into the box from the opening of the box and curing it. In the same manner as above, a metal-coated heat insulating heat insulating material of the present invention was obtained.
実施例４
微粉非晶質ケイ酸５９質量％、炭化珪素３０質量％、ガラス繊維１質量％、セラミック繊維１０質量％よりなる混合物に、外掛で５質量％のニップシールＮＡ水分散液を混練してなる混練物を所定形状のモールドに投入して加圧成形（成形圧１．５ＭＰａ）することにより成形体（密度３８０ｋｇ／ｍ３）を得た。該成形体から１００ｍｍ×５００ｍｍ×５００ｍｍの寸法の保温材を切り出し、得られた保温材をボックスの内部へ、ボックスの開口部から装填した。次に、ボックスの開口部へステンレス鋼板製の外装板をリベットにより取り付けることにより本発明の金属被覆断熱保温材を得た。
Example 4
A kneaded product obtained by kneading a 5% by mass nip seal NA aqueous dispersion with a mixture of 59% by mass of finely divided amorphous silicic acid, 30% by mass of silicon carbide, 1% by mass of glass fiber, and 10% by mass of ceramic fiber. Was put into a mold having a predetermined shape and subjected to pressure molding (molding pressure 1.5 MPa) to obtain a molded body (density 380 kg / m 3 ). A heat insulating material having a size of 100 mm × 500 mm × 500 mm was cut out from the molded body, and the obtained heat insulating material was loaded into the box from the opening of the box. Next, a metal-coated heat insulating heat insulating material of the present invention was obtained by attaching a stainless steel outer plate to the opening of the box with rivets.
上記実施例１から４で得られた金属被覆断熱保温材中の保温材を粉砕し、得られた粉砕物を水に投入すると、水面を浮遊しており、従って、保温材の粉砕物がサプレッションプールの水中に設置された非常用炉心冷却系統ストレーナの目詰まりの原因となる恐れがないことが確認できた。 When the heat insulating material in the metal-coated heat insulating heat insulating material obtained in Examples 1 to 4 is pulverized, and the pulverized material obtained is put into water, the water surface is floating, and therefore the pulverized material of the heat insulating material is suppressed. It was confirmed that there was no risk of clogging the emergency core cooling system strainer installed in the pool water.
なお、上記実施例１ないし４においては、単に、ステンレス鋼板製のボックスに保温材を装填した基本的形態の金属被覆断熱保温材を例示したが、本発明の金属被覆断熱保温材はこれに限定されるものではなく、直管、エルボ、ティ・バルブ等の形状、口径、曲げ角、保温材の厚さ、周囲状況等を勘案して本発明の金属被覆断熱保温材の分割数、形状等を適宜決定することができ、それらを組み合わせて配管設備の金属被覆断熱保温材とすることができることは勿論である。 In Examples 1 to 4 described above, the metal-coated heat insulating heat insulating material in a basic form in which a heat insulating material is simply loaded in a stainless steel plate box is illustrated, but the metal-coated heat insulating heat insulating material of the present invention is limited to this. In consideration of the shape of straight pipe, elbow, tee valve, etc., caliber, bending angle, thickness of heat insulating material, surrounding conditions, etc., the number of divisions, shape, etc. of the metal-coated heat insulating heat insulating material of the present invention Of course, these can be determined appropriately, and they can be combined to form a metal-coated heat insulating heat insulating material for piping equipment.
本発明の金属被覆断熱保温材は、各種配管設備、特に、原子力発電プラントの配管設備を断熱保温するための金属被覆断熱保温材として好適に使用することができる。 The metal-coated heat insulation material of the present invention can be suitably used as a metal-coating heat insulation material for heat insulation of various piping equipment, particularly piping equipment of nuclear power plants.
Claims (5)
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| JP2012188584A Division JP5450737B2 (en) | 2012-08-29 | 2012-08-29 | Thermal insulation and heat insulation method for piping equipment in nuclear power plants |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112201370A (en) * | 2020-08-28 | 2021-01-08 | 中国核电工程有限公司 | Passive containment heat exporting system with heat trap cooling device |
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