JISB7997-2 : 2020 排ガス中のダスト濃度自動計測器-第2部:光透過方式

JIS B 7997-2:2020の規格概要

この規格 B7997-2は、排ガス中に光(入射光)を照射したとき,ダストによって光が減衰することを利用することによって,主に低濃度から高濃度領域までのダスト濃度を測定する光透過方式のダスト濃度自動計測器について規定。

JISB7997-2 規格全文情報

規格番号
JIS B7997-2 
規格名称
排ガス中のダスト濃度自動計測器-第2部:光透過方式
制定年月日
2020/06/22
最新改正日
JIS 閲覧
 
対応国際規格

ISO

国際規格分類

ICS

13.040.40,71.040.40
主務大臣
経済産業
JISハンドブック
改訂:履歴
  • 2020-06-22制定日

 

B 7997-2:2020 

 

目 次

ページ

1 適用範囲························································································································· 1

2 引用規格························································································································· 1

3 用語及び定義 ··················································································································· 1

4 測定原理及び用途 ············································································································· 1

4.1 測定原理 ······················································································································ 1

4.2 用途 ···························································································································· 2

5 計測器の測定レンジ ·········································································································· 2

6 計測器の性能 ··················································································································· 2

7 構成及び構造 ··················································································································· 3

7.1 構成 ···························································································································· 3

7.2 構造 ···························································································································· 3

7.3 使用温度範囲 ················································································································ 3

8 試験······························································································································· 4

8.1 試験条件 ······················································································································ 4

8.2 試験粉体 ······················································································································ 4

8.3 校正 ···························································································································· 4

8.4 相関係数 ······················································································································ 4

8.5 振動安定性 ··················································································································· 4

8.6 温度安定性 ··················································································································· 4

8.7 電源電圧安定性 ············································································································· 4

8.8 繰返し性 ······················································································································ 5

8.9 ゼロドリフト ················································································································ 5

8.10 スパンドリフト ············································································································ 5

8.11 応答時間 ····················································································································· 5

8.12 絶縁抵抗 ····················································································································· 5

8.13 耐電圧 ························································································································ 5

9 検査······························································································································· 5

10 報告書 ·························································································································· 5

11 表示 ····························································································································· 5

附属書A(参考)オパシティメータ ························································································· 7

附属書B(参考)ゼロ校正及びスパン校正の例 ·········································································· 10

附属書C(参考)計測器の健全性の確認例 ··············································································· 11

附属書D(参考)計測器の性能試験検査に関する報告書の例························································ 12

 

 

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B 7997-2:2020 

 

まえがき

この規格は,産業標準化法に基づき,日本産業標準調査会の審議を経て,経済産業大臣が制定した日本

産業規格である。

この規格は,著作権法で保護対象となっている著作物である。

この規格の一部が,特許権,出願公開後の特許出願又は実用新案権に抵触する可能性があることに注意

を喚起する。経済産業大臣及び日本産業標準調査会は,このような特許権,出願公開後の特許出願及び実

用新案権に関わる確認について,責任はもたない。

 

 

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日本産業規格          JIS

 

B 7997-2:2020

 

排ガス中のダスト濃度自動計測器−第2部:光透過方式

Automated concentration monitoring instrument of dust in flue gas-Part 2: Light transmission method

 

1

適用範囲

この規格は,排ガス中に光(入射光)を照射したとき,ダストによって光が減衰することを利用するこ

とによって,主に低濃度から高濃度領域までのダスト濃度を測定する目的に使用する光透過方式のダスト

濃度自動計測器(以下,計測器という。)について規定する。

注記 この規格では,低濃度は10 mg/m3以下,中濃度は50 mg/m3以下,及び高濃度は50 mg/m3超え

をいう。また,この規格に示すダスト濃度は,標準状態[273.15 K(0 ℃),101.32 kPa]かつ乾

き状態に換算した値である。

 

2

引用規格

次に掲げる規格は,この規格に引用されることによって,この規格の規定の一部を構成する。これらの

引用規格は,その最新版(追補を含む。)を適用する。

JIS B 7996 排ガス中のダスト濃度自動計測器の性能評価方法

JIS K 0211 分析化学用語(基礎部門)

JIS K 0215 分析化学用語(分析機器部門)

JIS Z 8103 計測用語

JIS Z 8808 排ガス中のダスト濃度の測定方法

JIS Z 8852 排ガス中のダスト濃度の連続測定方法

JIS Z 8901 試験用粉体及び試験用粒子

 

3

用語及び定義

この規格で用いる主な用語及び定義は,JIS B 7996,JIS K 0211,JIS K 0215,JIS Z 8103,JIS Z 8808,

JIS Z 8852及びJIS Z 8901による。

 

4

測定原理及び用途

4.1

測定原理

ダクト内を流れる排ガス中のダストに光を照射したとき,ダストによって遮光され,光が減衰する。こ

の状態でダスト濃度と入射光の減衰量とが,相関関係にあることを利用した計測器が光透過式ダスト濃度

計である。

ランベルト・ベールの法則を適用して,ダスト濃度Cを,式(1)及び式(2)で求める。

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2

B 7997-2:2020 

 

kCD

I

I

Log

0

10

 ······································································· (1)

kD

I

I

Log

C

0

10

 ·········································································· (2)

ここに,

C: ダスト濃度(mg/m3)

 

I: 透過光強度

 

I0: 入射光強度

 

D: 測定距離(m)

 

k: 定数

 

なお,類似の原理の製品であるオパシティメータの説明を,附属書Aに示す。

注記1 ここに示すダスト濃度は,標準状態ではなく,実際の排ガスの温度及び圧力状態での値であ

る。

 

 

図1−計測器の原理概念図

 

注記2 低濃度領域を測定する場合,排ガス中のダストによって減衰された光を検出するために,一

般的にある程度の測定距離が必要であり,測定距離が短い施設に適用するため,マルチパス

を導入するなどの工夫が必要となる場合がある。

4.2

用途

この計測器は,主に工場,火力発電所及び廃棄物焼却施設で使用する燃料の燃焼及びその他の燃焼に伴

って排出される排ガス中のダスト濃度を長期間かつ連続的に測定し,排出量監視又はプラント制御を目的

として使用する。

 

5

計測器の測定レンジ

計測器の測定レンジは,通常,0 mg/m3〜100 mg/m3とし,それ以外のレンジは,用途に合わせて適切な

ものを選ぶ。

 

6

計測器の性能

計測器は,箇条8によって試験を行ったとき,表1の性能を満足しなければならない。

 

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JIS B 7997-2:2020の国際規格分類一覧

  • 13.040.40
  • 71.040.40

JIS B 7997-2:2020の関連規格と引用規格一覧

規格番号
規格名称
B7996
排ガス中のダスト濃度自動計測器の性能評価方法
K0211
分析化学用語(基礎部門)
K0215
分析化学用語(分析機器部門)
Z8103
計測用語
Z8808
排ガス中のダスト濃度の測定方法
Z8852
排ガス中のダスト濃度の連続測定方法
Z8901
試験用粉体及び試験用粒子