標準編號:	HJ 75-2017
中文名稱:	固定污染源煙氣（SO2、NOx、顆粒物）排放連續監測技術規范
英文名稱:	Specifications for continuous emissions monitoring of SO2, NOx, and particulate matter in the flue gas emitted from stationary sources
行業分類:	HJ    環境保護行業標準
發布機構:	中華人民共和國環境保護部
發布日期:	2017-12-29
實施日期:	2018-3-1
標準狀態:	valid
替代舊標準:	HJ/T 75-2007 固定污染源煙氣排放連續監測技術規范(試行)
翻譯語言:	英文
文件格式:	PDF
中文字符數:	72000 字
翻譯價格(元):	4320.0
交付時間:	付款后 1 個工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is formulated with a view to implementing the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution, strengthening the monitoring, supervision and control over the flue gas emitted from stationary sources, and improving the level of continuous monitoring management of flue gas emitted from stationary sources. This standard specifies the requirements on the composition and functions, technical performance, monitoring station building and installation, performance testing of technical indexes, technical acceptance, daily operation management, daily operation quality assurance and data review and processing in relation to the continuous monitoring system for flue gas (SO2, NOX and particulate matters) emitted from stationary sources. This standard is a revision with respect to HJ/T 75-2007 Specifications for Continuous Emissions Monitoring of Flue Gas Emitted from Stationary Sources (on trial). This standard was firstly issued in 2001 and revised in 2007 for the first time. Its original drafting organization is Shanghai Environmental Monitoring Center. It is the second revision with the main revised contents as follows: ——Flue gas humidity testing and quality control requirements are added; ——The introduction to the method and the structure of the monitoring instrument is simplified; ——CEMS installation requirements are refined; ——Supplements are made for the performance testing and technical acceptance methods, technical requirements and relevant record forms; ——Requirements are refined as to the operation management and quality assurance as well as data review and processing. Annex A, Annex C and Annex H of this standard are normative. Annex B, Annex D, Annex E, Annex F and Annex G are informative. As of the implementation date of this standard, HJ/T 75-2007 Specifications for Continuous Emissions Monitoring of Flue Gas Emitted from Stationary Sources (on trial) is abolished. This standard is formulated under the organization of the Department of Environment Monitoring and Department of Science, Technology and Standards under the Ministry of Environmental Protection. This standard was approved by the Ministry of Environmental Protection on December 29, 2017. This standard shall be implemented as of March 1, 2018. The Ministry of Environmental Protection is in charge of the interpretation of this standard. Specifications for Continuous Emissions Monitoring of SO2, NOX, and Particulate Matter in the Flue Gas Emitted from Stationary Sources 1 Scope of Application This standard specifies the requirements on the composition and functions, technical performance, monitoring station building and installation, performance testing of technical indexes, technical acceptance, daily operation management, daily operation quality assurance and data review and processing in relation to the continuous monitoring system for the gaseous pollutants (SO2 and NOX) emission, particulate matter emission and relevant flue gas parameters among the continuous monitoring systems for flue gas emitted from stationary sources. This standard is applicable to continuous monitoring systems for flue gas (SO2, NOX and particulate matter) emitted from stationary sources such as thermal power plant boilers, industrial/civilian boilers and industrial furnaces and kilns with solid and liquid as fuel or raw material. This standard may serve as a reference for the continuous monitoring system for flue gas (SO2, NOX and particulate matter) emitted from domestic waste incinerators, hazardous waste incinerators, and stationary sources with gas as fuel or raw materials. Prior to the formal promulgation and implementation of the standards for other continuous monitoring systems for flue gas pollutant emission, this standard may be implemented as a reference. 2 Normative References The following documents or provisions therein are referred to in this standard. For undated references, the latest edition of the normative document applies. GB 4208 Degrees of Protection Provided by Enclosure ( IP Code) GB 50057 Design Code for Protection of Structures against Lightning GB 50093 Code for Construction and Quality Acceptance of Automation Instrumentation Engineering GB 50168 Code for Construction and Acceptance of Cable System Electric Equipment Installation Engineering GB/T 16157 Determination of Particulates and Sampling Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source HJ 76 Specifications and test procedures for Continuous Emission Monitoring System for SO2, NOX and Particulate Matter in Flue Gas emitted from Stationary Sources HJ/T 212 Standard for Data Communication of Pollution Emission Auto Monitoring System HJ/T 397 Technical Specifications for Emission Monitoring of Stationary Source 3 Terms and Definitions 3.1 continuous emission monitoring, CEM continuous real time automatic monitoring over emission concentration and emission amount of particulate matter and (or) gaseous pollutants emitted by stationary sources, abbreviated as CEM 3.2 continuous monitoring system, CMS all the equipment necessary for continuous monitoring of flue gas parameters for the stationary sources, abbreviated as CEMS 3.3 continuous emission monitoring system, CEMS all the equipment necessary for continuous monitoring over emission concentration and emission amount of particulate matter and (or) gaseous pollutants emitted by stationary sources, abbreviated as CEMS 3.4 valid operation of CEMS operation within the specified validity period which meet the technical index requirements given in this standard, excluding, however, the operation periods with detector contamination, instrument failure, system calibration or system without regular calibration or regular verification 3.5 valid data The data measured under the condition that the stationary source emits flue gas during valid operation of the CEMS which meets the technical index requirements in this standard and passes the acceptance 3.6 valid hourly average arithmetic average of valid data for no less than 45 min within 1h on the hour 3.7 reference method standard method released by the State or profession for comparison with CEMS measurement result 3.8 checkout/verification the testing process to compare the testing results of CEMS (including sampling system and analysis system) with the reference method in terms of relative accuracy, correlation coefficient, confidence interval, allowable interval, relative error, absolute error, etc. 3.9 performance testing calibration and checkout/verification carried out for the CEMS prior to the technical acceptance and after CEMS installation, initial adjustment and continuous normal operation for at least 168 hours 3.10 comparison testing random inspection on the accuracy of CEMS in valid operation with the reference method 3.11 response time response time refers to the interval from the time when standard gas is introduced into the CEMS system sampling probe to the time when the analyzer indication value reaches 90% of the nominal value of standard gas, including pipeline transmission time and instrument response time 3.12 zero drift percentage of deviation between instrument reading and initial measurement value of zero gas relative to the full span when zero gas is introduced into the CEMS after operating for a specified time under the premise that the instrument is not subjected to repair, maintenance or adjustment 3.13 span drift percentage of deviation between instrument reading and initial measurement value of span calibration gas relative to the full span when zero gas is introduced into the CEMS after operating for a specified time under the premise that the instrument is not subjected to repair, maintenance or adjustment 3.14 relative accuracy ratio of the sum of the absolute value of average for the difference between data pairs and the confidence coefficient to the average of determination data with reference method where the measurement results in the same time interval and in the same status compose several data pairs when the reference method is adopted to measure the gas pollutant concentration in the flue gas synchronously with the CEMS 3.15 correlation calibration the process to calibrate CEMS for particulate matter with reference method via the establishment of a correlation curve between data pairs where the measurement results in the same time interval and in the same status compose several data pairs when the reference method is adopted to measure the gas pollutant concentration in the flue gas synchronously with the CEMS 3.16 velocity field coefficient ratio of average flue gas flow velocity measured with reference method and that measured with CEMS in the same time interval and same status when reference method and CEMS are adopted synchronously to measure the average flue gas flow velocity 4 Composition and Function Requirements on CEMS for Stationary Sources CEMS is composed of particulate matter monitoring unit and (or) gaseous pollutants monitoring unit, flue gas parameter monitoring unit and data acquisition and processing unit. CEMS shall realize such functions as measurement of the particulate matter concentration and concentration of gaseous pollutants SO2 and/or NOX in the flue gas, the flue gas parameters (temperature, pressure, flow velocity or flow capacity, humidity, oxygen content, etc.), as well as calculation of pollutant emission rate and emission amount in the flue gas, display (supporting printing) and record of a variety of data and parameters, the formation of related charts, which may be transmitted to the management department through data, teletext and other means. The output parameter calculation shall meet the requirements of Annex C. As for the nitrogen oxide monitoring unit, NO2 can be measured directly, or measured after it is converted to NO after passing through the reformer, but it is not allowed to monitor the NO in the flue gas only. The efficiency of converting NO2 to NO shall meet the requirements specified in HJ 76. 5 Technical Performance Requirements on CEMS for Stationary Sources The relevant requirements in HJ 76 shall be complied with. 6 Requirements on Monitoring Station Building of CEMS for Stationary Sources 6.1 An independent station building shall be provided for the outdoor CEMS. The distance between the monitoring station building and the sampling site shall be as close as possible, and it should not exceed 70m in principle. 6.2 The load intensity of the foundation for monitoring station building shall be ≥ 2,000kg/m2. If only a single cabinet is placed in the station building, its area shall be ≥ 2.5 × 2.5m2. If more than one set of analysis instruments are placed in the same station building, the area of the station building shall be increased by at least 3m2 for each additional cabinet to facilitate operation and maintenance. The spatial height of the station building shall be ≥ 2.8m, and building shall be built at an elevation ≥ 0m. 6.3 Air conditioner and heating equipment shall be installed in the monitoring station building. The indoor temperature shall be maintained at (15~30) °C and the relative humidity shall be ≤ 60%. The air conditioner shall have an automatic restart function in case of power recovery. Exhaust fans or other ventilation facilities shall be installed in the station building.

Foreword i 1 Scope of Application 2 Normative References 3 Terms and Definitions 4 Composition and Function Requirements on CEMS for Stationary Sources 5 Technical Performance Requirements on CEMS for Stationary Sources 6 Requirements on Monitoring Station Building of CEMS for Stationary Sources 7 Requirements on Installation of CEMS for Stationary Sources 8 Performance Testing for the Technical Indexes of CEMS for Stationary Sources 9 Technical Acceptance of CEMS for Stationary Sources 10 Daily Operation and Management Requirements for CEMS for Stationary Sources 11 Quality Assurance Requirements for Daily Operation of CEMS for Stationary Sources 12 Data Review and Processing for CEMS for Stationary Sources Annex A (Normative) Performance Testing Methods for Key Technical Indexes of CEMS for Stationary Sources Annex B (Informative) Analysis and Processing Methods for the Result of Performance Testing of Technology Index of CEMS for Stationary Sources Annex C (Normative) Calculation Method for Output Parameters of CEMS for Stationary Sources Annex D (Informative) Original Data Sheet for System Installation Performance Test of CEMS for Stationary Sources Annex E (Informative) Performance Testing Report for CEM System of Flue Gas Emitted from Stationary Sources Annex F (Informative) Acceptance Report of Technical Indexes for CEMS for Stationary Sources Annex G (Informative) Original Routine Inspection, Calibration and Maintenance Record for CEMS for Stationary Sources Annex H (Normative) Requirements for Data Acquisition Processing and Transmission System of CEMS for Stationary Sources

1 適用范圍 本標準規定了固定污染源煙氣排放連續監測系統中的氣態污染物（SO2、NOX）排放、顆粒物排放和有關煙氣參數（含氧量等）連續監測系統的組成和功能、技術性能、監測站房、安裝、技術指標調試檢測、技術驗收、日常運行管理、日常運行質量保證以及數據審核和處理的有關要求。 本標準適用于以固體、液體為燃料或原料的火電廠鍋爐、工業/民用鍋爐以及工業爐窯等固定污染源煙氣（SO2、NOx、顆粒物）排放連續監測系統。 生活垃圾焚燒爐、危險廢物焚燒爐及以氣體為燃料或原料的固定污染源煙氣（SO2、NOx、顆粒物）排放連續監測系統可參照本標準執行。 其他煙氣污染物排放連續監測系統相應標準未正式頒布實施前，可參照本標準執行。 2 規范性引用文件 本標準內容引用了下列文件或其中的條款。凡是未注明日期的引用文件，其最新版本適用于本標準。 GB 4208 外殼防護等級 GB 50057 建筑物防雷設計規范 GB 50093 自動化儀表工程施工及質量驗收規范 GB 50168 電氣裝置安裝工程電纜線路施工及驗收規范 GB/T 16157 固定污染源排氣中顆粒物測定與氣態污染物采樣方法 HJ 76 固定污染源煙氣（SO2、NOX、顆粒物）排放連續監測系統技術要求及檢測方法 HJ/T 212 污染源在線自動監控（監測）系統數據傳輸標準 HJ/T 397 固定源廢氣監測技術規范 3 術語和定義 3.1 煙氣排放連續監測continuous emission monitoring, CEM 對固定污染源排放的顆粒物和（或）氣態污染物的排放濃度和排放量進行連續、實時的自動監測，簡稱CEM。 3.2 連續監測系統continuous monitoring system, CMS 連續監測固定污染源煙氣參數所需要的全部設備，簡稱CMS。 3.3 煙氣排放連續監測系統continuous emission monitoring system, CEMS 連續監測固定污染源顆粒物和（或）氣態污染物排放濃度和排放量所需要的全部設備，簡稱CEMS。 3.4 CEMS 的正常運行valid operation of CEMS 符合本標準的技術指標要求，在規定有效期內的運行，但不包括檢測器污染、儀器故障、系統校準或系統未經定期校準、定期校驗等期間的運行。 3.5 有效數據valid data 符合本標準的技術指標要求，經驗收合格的CEMS，在固定污染源排放煙氣條件下，CEMS 正常運行所測得的數據。 3.6 有效小時均值valid hourly average 整點1h 內不少于45min 的有效數據的算術平均值。 3.7 參比方法reference method 用于與CEMS 測量結果相比較的國家或行業發布的標準方法。 3.8 校驗checkout/verification 用參比方法對CEMS（含取樣系統、分析系統）檢測結果進行相對準確度、相關系數、置信區間、允許區間、相對誤差、絕對誤差等的比對檢測過程。 3.9 調試檢測performance testing CEMS 安裝、初調和至少正常連續運行168h 后，于技術驗收前對CEMS 進行的校準和校驗。 3.10 比對監測comparision testing 用參比方法對正常運行的CEMS 的準確度進行抽檢。 3.11 系統響應時間response time 系統響應時間指從CEMS 系統采樣探頭通入標準氣體的時刻起，到分析儀示值達到標準氣體標稱值90%的時刻止，中間的時間間隔。包括管線傳輸時間和儀表響應時間。 3.12 零點漂移zero drift 在儀器未進行維修、保養或調節的前提下，CEMS 按規定的時間運行后通入零點氣體，儀器的讀數與零點氣體初始測量值之間的偏差相對于滿量程的百分比。 3.13 量程漂移span drift 在儀器未進行維修、保養或調節的前提下，CEMS 按規定的時間運行后通入量程校準氣體，儀器的讀數與量程校準氣體初始測量值之間的偏差相對于滿量程的百分比。 3.14 相對準確度relative accuracy 采用參比方法與CEMS 同步測定煙氣中氣態污染物濃度，取同時間區間且相同狀態的測量結果組成若干數據對，數據對之差的平均值的絕對值與置信系數之和與參比方法測定數據的平均值之比。 3.15 相關校準correlation calibration 采用參比方法與CEMS 同步測量煙氣中顆粒物濃度，取同時間區間且相同狀態的測量結果組成若干數據對，通過建立數據對之間的相關曲線，用參比方法校準顆粒物CEMS的過程。 3.16 速度場系數velocity field coefficient 參比方法與CEMS 同步測量煙氣流速，參比方法測量的煙氣平均流速與同時間區間且相同狀態的CEMS 測量的煙氣平均流速的比值。 4 固定污染源煙氣排放連續監測系統的組成和功能要求 CEMS 由顆粒物監測單元和（或）氣態污染物監測單元、煙氣參數監測單元、數據采集與處理單元組成。 CEMS 應當實現測量煙氣中顆粒物濃度、氣態污染物SO2 和（或）NOX 濃度，煙氣參數（溫度、壓力、流速或流量、濕度、含氧量等），同時計算煙氣中污染物排放速率和排放量，顯示（可支持打?。┖陀涗浉鞣N數據和參數，形成相關圖表，并通過數據、圖文等方式傳輸至管理部門等功能。輸出參數計算應滿足附錄C 的要求。 對于氮氧化物監測單元，NO2 可以直接測量，也可通過轉化爐轉化為NO 后一并測量，但不允許只監測煙氣中的NO。NO2 轉換為NO 的效率應滿足HJ 76 的要求。 5 固定污染源煙氣排放連續監測系統技術性能要求 滿足HJ 76 中相關要求。 6 固定污染源煙氣排放連續監測系統監測站房要求 6.1 應為室外的CEMS 提供獨立站房，監測站房與采樣點之間距離應盡可能近，原則上不超過70m。 6.2 監測站房的基礎荷載強度應≥2000kg/m2。若站房內僅放置單臺機柜，面積應≥2.5×2.5m2。若同一站房放置多套分析儀表的，每增加一臺機柜，站房面積應至少增加3m2，便于開展運維操作。站房空間高度應≥2.8m，站房建在標高≥0m 處。 6.3 監測站房內應安裝空調和采暖設備，室內溫度應保持在（15～30）℃，相對濕度應≤60%，空調應具有來電自動重啟功能，站房內應安裝排風扇或其他通風設施。 6.4 監測站房內配電功率能夠滿足儀表實際要求，功率不少于8 kW，至少預留三孔插座5個、穩壓電源1 個、UPS 電源一個。 6.5 監測站房內應配備不同濃度的有證標準氣體，且在有效期內。標準氣體應當包含零氣（即含二氧化硫、氮氧化物濃度均≤0.1μmol/mol 的標準氣體，一般為高純氮氣，純度≥99.999%；當測量煙氣中二氧化碳時，零氣中二氧化碳≤400μmol/mol，含有其他氣體的濃度不得干擾儀器的讀數）和CEMS 測量的各種氣體（SO2、NOX、O2）的量程標氣，以滿足日常零點、量程校準、校驗的需要。低濃度標準氣體可由高濃度標準氣體通過經校準合格的等比例稀釋設備獲得（精密度≤1%），也可單獨配備。 6.6 監測站房應有必要的防水、防潮、隔熱、保溫措施，在特定場合還應具備防爆功能。 6.7 監測站房應具有能夠滿足CEMS 數據傳輸要求的通訊條件。 7 固定污染源煙氣排放連續監測系統安裝要求 7.1 安裝位置要求 7.1.1 一般要求 7.1.1.1 位于固定污染源排放控制設備的下游和比對監測斷面上游； 7.1.1.2 不受環境光線和電磁輻射的影響； 7.1.1.3 煙道振動幅度盡可能??； 7.1.1.4 安裝位置應盡量避開煙氣中水滴和水霧的干擾，如不能避開，應選用能夠適用的檢測探頭及儀器； 7.1.1.5 安裝位置不漏風； 7.1.1.6 安裝CEMS 的工作區域應設置一個防水低壓配電箱，內設漏電保護器、不少于2個10A 插座，保證監測設備所需電力； 7.1.1.7 應合理布置采樣平臺與采樣孔； a) 采樣或監測平臺長度應≥2m，寬度應≥2m 或不小于采樣槍長度外延1m，周圍設置1.2m 以上的安全防護欄，有牢固并符合要求的安全措施，便于日常維護（清潔光學鏡頭、檢查和調整光路準直、檢測儀器性能和更換部件等）和比對監測。 b) 采樣或監測平臺應易于人員和監測儀器到達，當采樣平臺設置在離地面高度≥2m的位置時，應有通往平臺的斜梯（或Z 字梯、旋梯），寬度應≥0.9m；當采樣平臺設置在離地面高度≥20m 的位置時，應有通往平臺的升降梯。 c) 當CEMS 安裝在矩形煙道時，若煙道截面的高度＞4m，則不宜在煙道頂層開設參比方法采樣孔；若煙道截面的寬度＞4m，則應在煙道兩側開設參比方法采樣孔，并設置多層采樣平臺。 d) 在CEMS 監測斷面下游應預留參比方法采樣孔，采樣孔位置和數目按照GB/T 16157 的要求確定?，F有污染源參比方法采樣孔內徑應≥80mm，新建或改建污染源參比方法采樣孔內徑應≥90mm。在互不影響測量的前提下，參比方法采樣孔應盡可能靠近CEMS 監測斷面。當煙道為正壓煙道或有毒氣時，應采用帶閘板閥的密封采樣孔。 取樣口 煙道 最短2m或采樣槍長度 操作平臺 操作平臺寬度至少2m 操作平臺 煙囪 采樣槍長度 7.1.2 具體要求 7.1.2.1 應優先選擇在垂直管段和煙道負壓區域，確保所采集樣品的代表性。 7.1.2.2 測定位置應避開煙道彎頭和斷面急劇變化的部位。對于圓形煙道，顆粒物CEMS和流速CMS，應設置在距彎頭、閥門、變徑管下游方向≥4 倍煙道直徑，以及距上述部件上游方向≥2 倍煙道直徑處；氣態污染物CEMS，應設置在距彎頭、閥門、變徑管下游方向≥2 倍煙道直徑，以及距上述部件上游方向≥0.5 倍煙道直徑處。對于矩形煙道，應以當量直徑計，其當量直徑按式（1）計算。 （1） 式中：D——當量直徑； A、B——邊長。 7.1.2.3 對于新建排放源，采樣平臺應與排氣裝置同步設計、同步建設，確保采樣斷面滿足本標準7.1.2.2 的要求；對于現有排放源，當無法找到滿足7.1.2.2 的采樣位置時，應盡可能選擇在氣流穩定的斷面安裝CEMS 采樣或分析探頭，并采取相應措施保證監測斷面煙氣分布相對均勻，斷面無紊流。 對煙氣分布均勻程度的判定采用相對均方根σr 法，當σr≤0.15 時視為煙氣分布均勻，σr 按式（2）計算。 （2） 式中：σr——流速相對均方根； vi——測點煙氣流速，m/s； ——截面煙氣平均流速，m/s； n——截面上的速度測點數目，測點的選擇按照GB/T 16157 執行。 7.1.2.4 為了便于顆粒物和流速參比方法的校驗和比對監測，CEMS 不宜安裝在煙道內煙氣流速＜5m/s 的位置。 7.1.2.5 若一個固定污染源排氣先通過多個煙道或管道后進入該固定污染源的總排氣管時，應盡可能將CEMS 安裝在總排氣管上，但要便于用參比方法校驗CEMS；不得只在其中的一個煙道或管道上安裝CEMS，并將測定值作為該源的排放結果；但允許在每個煙道或管道上安裝CEMS。 7.1.2.6 固定污染源煙氣凈化設備設置有旁路煙道時，應在旁路煙道內安裝CEMS 或煙溫、流量CMS。其安裝、運行、維護、數據采集、記錄和上傳應符合本標準要求。 7.2 安裝施工要求 7.2.1 CEMS 安裝施工應符合GB 50093、GB 50168 的規定。 7.2.2 施工單位應熟悉CEMS 的原理、結構、性能，編制施工方案、施工技術流程圖、設備技術文件、設計圖樣、監測設備及配件貨物清單交接明細表、施工安全細則等有關文件。 7.2.3 設備技術文件應包括資料清單、產品合格證、機械結構、電氣、儀表安裝的技術說明書、裝箱清單、配套件、外購件檢驗合格證和使用說明書等。 7.2.4 設計圖樣應符合技術制圖、機械制圖、電氣制圖、建筑結構制圖等標準的規定。 7.2.5 設備安裝前的清理、檢查及保養應符合以下要求。 a) 按交貨清單和安裝圖樣明細表清點檢查設備及零部件，缺損件應及時處理，更換補齊。 b) 運轉部件如：取樣泵、壓縮機、監測儀器等，滑動部位均需清洗、注油潤滑防護。 c) 因運輸造成變形的儀器、設備的結構件應校正，并重新涂刷防銹漆及表面油漆，保養完畢后應恢復原標記。 7.2.6 現場端連接材料（墊片、螺母、螺栓、短管、法蘭等）為焊件組對成焊時，壁（板）的錯邊量應符合以下要求： a) 管子或管件對口、內壁齊平，最大錯邊量≥1 mm； b) 采樣孔的法蘭與連接法蘭幾何尺寸極限偏差不超過±5 mm，法蘭端面的垂直度極限偏差≤0.2%； c) 采用透射法原理顆粒物監測儀器發射單元和顆粒物監測儀反射單元，測量光束從發射孔的中心出射到對面中心線相疊合的極限偏差≤0.2%。 7.2.7 從探頭到分析儀的整條采樣管線的鋪設應采用橋架或穿管等方式，保證整條管線具有良好的支撐。管線傾斜度≥5o，防止管線內積水，在每隔4～5 m 處裝線卡箍。當使用伴熱管線時應具備穩定、均勻加熱和保溫的功能；其設置加熱溫度≥120℃，且應高于煙氣露點溫度10℃以上，其實際溫度值應能夠在機柜或系統軟件中顯示查詢。 7.2.8 電纜橋架安裝應滿足最大直徑電纜的最小彎曲半徑要求。電纜橋架的連接應采用連接片。配電套管應采用鋼管和PVC 管材質配線管，其彎曲半徑應滿足最小彎曲半徑要求。 7.2.9 應將動力與信號電纜分開敷設，保證電纜通路及電纜保護管的密封，自控電纜應符合輸入和輸出分開、數字信號和模擬信號分開的配線和敷設的要求。 7.2.10 安裝精度和連接部件坐標尺寸應符合技術文件和圖樣規定。監測站房儀器應排列整齊，監測儀器頂平直度和平面度應不大于5mm，監測儀器牢固固定，可靠接地。二次接線正確、牢固可靠，配導線的端部應標明回路編號。配線工藝整齊，綁扎牢固，絕緣性好。 7.2.11 各連接管路、法蘭、閥門封口墊圈應牢固完整，均不得有漏氣、漏水現象。保持所有管路暢通，保證氣路閥門、排水系統安裝后應暢通和啟閉靈活。自動監測系統空載運行24h 后，管路不得出現脫落、滲漏、振動強烈現象。 7.2.12 反吹氣應為干燥清潔氣體，反吹系統應進行耐壓強度試驗，試驗壓力為常用工作壓力的1.5 倍。 7.2.13 電氣控制和電氣負載設備的外殼防護應符合GB 4208 的技術要求，戶內達到防護等級IP24 級，戶外達到防護等級IP54 級。 7.2.14 防雷、絕緣要求 a) 系統儀器設備的工作電源應有良好的接地措施，接地電纜應采用大于4 mm2 的獨芯護套電纜，接地電阻小于4Ω，且不能和避雷接地線共用。 b) 平臺、監測站房、交流電源設備、機柜、儀表和設備金屬外殼、管纜屏蔽層和套管的防雷接地，可利用廠內區域保護接地網，采用多點接地方式。廠區內不能提供接地線或提供的接地線達不到要求的，應在子站附近重做接地裝置。 c) 監測站房的防雷系統應符合GB 50057 的規定。電源線和信號線設防雷裝置。 d) 電源線、信號線與避雷線的平行凈距離≥1 m，交叉凈距離≥0.3 m（見圖2）。 e) 由煙囪或主煙道上數據柜引出的數據信號線要經過避雷器引入監測站房，應將避雷器接地端同站房保護地線可靠連接。 f) 信號線為屏蔽電纜線，屏蔽層應有良好絕緣，不可與機架、柜體發生摩擦、打火，屏蔽層兩端及中間均需做接地連接（見圖3）。