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國家標準《礦物棉工業大氣污染物排放標準(GB 41617—2022)》發布

2022-11-22 09:31:47來源:生態環境部 閱讀量:25108

導讀:新國標《礦物棉工業大氣污染物排放標準(GB 41617—2022)》于近日發布,將有效解決現行標準行業針對性不強,部分排放限值寬松,與目前的大氣污染治理技術不匹配等問題。
  一、標準出臺的背景是什么?
 
  《中共中央 國務院關于深入打好污染防治攻堅戰的意見》中明確指出,“十四五”期間,要大力加強細顆粒物(PM2.5)和臭氧污染協同控制,推進氮氧化物(NOx)和揮發性有機物(VOCs)協同減排。礦物棉工業是NOx、顆粒物等污染物的重要排放行業。我國是礦物棉生產大國,巖(礦)棉產量約占世界產量的55%,玻璃棉產量占世界產量的40%,產能主要分布在河北、江西、湖北、山東、四川等地區。目前,我國礦物棉工業大氣污染物排放執行《大氣污染物綜合排放標準》(GB 16297—1996)、《工業爐窯大氣污染物排放標準》(GB 9078—1996)和《揮發性有機物無組織排放控制標準》(GB 37822—2019)?,F行標準行業針對性不強,部分排放限值寬松,與目前的大氣污染治理技術不匹配;同時,現行標準以末端控制為主,沒有規定更有效的源頭和過程管控要求,不能滿足當前環境管理需求,亟需制訂適用行業生產工藝特點的排放標準,落實精準治污、科學治污、依法治污要求,進一步規范行業污染排放管理。
 
  二、本標準在排放控制上有哪些特點?
 
  本標準基于精準科學治污、減污降碳協同增效的原則,實施大氣污染物與溫室氣體協同減排和協同治理,強化以源頭削減、過程控制到末端治理的全過程管控。
 
  (一)強化無組織排放源頭和過程管控
 
  顆粒物無組織排放是礦物棉工業污染控制的重點和難點之一。本標準綜合考慮了礦物棉工業物料性狀、工藝裝備水平和行業管理現狀,從煤炭、碎玻璃、硅質原料等物料儲存、裝卸、輸送以及配料、切割等工藝環節,有針對性地提出無組織排放控制要求。在VOCs無組織排放控制方面,標準抓住樹脂、膠粘劑等VOCs物料的儲存、轉移、輸送以及集棉、固化工序等主要環節,規定了措施性管控要求。此外,本標準提出了顆粒物和VOCs廠區內監控濃度限值的建議值,由地方根據當地環境保護的需要自主實施,對廠區內無組織排放狀況進行監控。通過上述控制措施,實現無組織排放全過程管控。
 
  (二)加強有組織排放精準管控
 
  本標準基于巖(礦)棉、玻璃棉生產流程的產排污分析,區分熔制、成型、切割及原料三個工序,規定了適用的有組織排放限值。采用濃度和去除效率雙指標管控,依據企業初始VOCs排放量實施差異化管控。對于VOCs排放量大的企業,實行排放濃度與去除效率雙重控制;對于排放量小的企業,只需要滿足濃度指標的要求;同時,為鼓勵源頭替代,對于采用原輔材料符合國家有關低VOCs含量產品規定的企業,僅執行濃度指標,鼓勵企業采用水性涂料等源頭措施削減排放總量。
 
  (三)優化控制指標,體現減污降碳協同控制
 
  純氧燃燒工藝目前正在玻璃棉的玻璃窯爐進行推廣應用,該技術采用純氧(含氧量在90%以上)代替空氣助燃,在顯著減少NOx產生同時,又降低能耗,是減污降碳源頭控制技術。對于燃燒裝置的廢氣排放,美國、日本、歐盟等國家以及我國通常都是采用基準含氧量的指標來控制稀釋排放,而純氧燃燒工藝實測廢氣含氧量高達20%,采用基準含氧量難以達標,不利于該技術的推廣應用。為此,標準設置了基準排氣量指標替代基準含氧量的指標,解決了該技術推廣應用的瓶頸問題,確保標準管控的科學性。
 
  三、標準實施的可行性如何?
 
  近年來,京津冀、長三角等重點區域出臺了相關地方標準,區域內礦物棉企業已率先開展了工藝設備和環保設施的升級改造,積累了達標技術的成熟案例,為標準實施奠定了良好的技術基礎。行業協會和相關專家一致認為,本標準能夠反映行業關切,具有很強的指導性和可操作性,迫切希望標準出臺。目前,技術先進且環保措施比較完善的大中型企業,已具備達標能力;其他企業應根據自身情況實施環保設施升級改造,會相應增加生產成本,但不會對供給或需求產生收縮效應,處于行業可接受水平。標準制訂過程中,已面向社會公開征求意見,并與行業協會及相關企業充分溝通,市場已有預期,相關企業已經開始籌備改造工作?,F有企業自2024年7月1日起實施該標準,給予企業充足的升級改造時間。
 
  四、標準實施的環境和社會效益如何?
 
  標準的修訂實施具有良好的環境效益,對改善環境空氣質量具有積極作用,滿足公眾對良好生態環境的需求。實施本標準將進一步促進行業公平競爭,有效解決“劣幣驅逐良幣”問題,有利于建立更加公平有序的市場環境。同時,將促進清潔燃料替代、純氧助燃等減污降碳協同增效技術的推廣應用,推動行業高質量發展。

 

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