JP4387301B2 - 水置換による炭化水素原料分解処理 - Google Patents
水置換による炭化水素原料分解処理 Download PDFInfo
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Description
本発明は、希釈スチームの補助又は代用として水を用いる炭化水素原料の分解に関する。
スチーム分解は、様々な炭化水素供給原料をオレフィンへ分解することに長らく用いられてきた。従来のスチーム分解は、2つの主要な区画、即ち対流区画及び放射区画を有する炉を用いる。炭化水素供給原料は通常は炉の対流区画へ液体として入り(蒸気として入る軽供給原料は除く)、通常は、放射区画からの温排ガスとの間接接触により、或いは水蒸気との直接接触により加熱されて気化される。気化された供給原料と水蒸気との混合体は放射区画へ導入されて、ここで分解がなされる。オレフィンを含む結果的な生成物は、例えばクエンチングなどの更なる下流処理のために炉を離れる。
本発明は炉内の炭化水素原料を調整する処理を与え、この処理は(a)炭化水素原料を加熱し、(b)水及び希釈スチームを加熱原料へ供給して混合体を形成し、(c)この混合体を加熱し、(d)この加熱された混合体を(c)から炉へ供給し、ここで(b)における水は、水及び希釈スチームの重量に基づいて少なくとも約1%乃至100%重量部の量が添加される。1つの実施形態においては、水及び希釈スチームの重量に基づいて少なくとも約3%重量部の量の水が添加される(即ち、少なくとも約3%から100%の水)。他の実施形態においては、水及び希釈スチームの重量に基づいて少なくとも約10%重量部の量の水が添加される。更に他の実施形態においては、水及び希釈スチームの重量に基づいて少なくとも約30%重量部の量の水が添加される。本発明によれば、水は希釈スチームの全体的な代用である(即ち、蒸気の添加がない)。しかしながら、希釈蒸気と水との両方を炭化水素原料へ供給することが好ましい。
(a)炭化水素原料を対流区画における熱交換管内で輻射区画からの高温排ガスによる間接的熱交換によって予熱し 予熱原料を与え、
(b)第1多孔分散管における予熱原料に水を添加し、第2多孔分散管における予熱原料に希釈スチームを添加して原料混合体を形成し、
(c)原料混合体を対流区画における熱交換管内で輻射区画からの高温排ガスによる間接的熱交換によって加熱して加熱原料混合体を形成し、
(d)この加熱された混合体を輻射区画へ供給し、その加熱原料混合体における炭化水素は熱分解されて生成物を形成することを含み、
ここで(b)における水は、水及び希釈スチームの重量に基づいて少なくとも約1%乃至100%重量部の量が添加される。
図1は分解炉と共に採用された本発明に係る処理の模式的な流れ図であり、炉の対流区画を特に強調している。この図は処理変数、即ち炉の輻射区画に対する処理ガスの温度に応じて希釈スチームに対する水の比を変化させる制御図を示す。図2は処理パラメータ、特に炉を出る排ガスの温度に関連して希釈スチームに対する水の比を変動させるのに用いる制御系の模式図を示す。図3は同様な制御系であるが、炉の対流区画における処理ガスの温度に関連して希釈スチームに対する水の比を変動させる制御系の模式図である。
特に断らない限り、全てのパーセンテージ、割合、比等は重量部による。特に断らない限り、組成又は成分に対する参照基準は、例えば組成の混合体など他の組成及び成分の組み合わせのみならず、それ自身の組成又は成分を含む。
Claims (24)
- 炉内の炭化水素原料を調整する方法であって、この方法は、
(a)炭化水素原料を加熱して加熱原料を与え、
(b)水及び希釈スチームを加熱原料へ添加して混合体を形成し、
(c)この混合体を加熱して加熱混合体を与え、
(d)この加熱された混合体を(c)から炉へ供給し、ここで(b)における水は、水及び希釈スチームの重量に基づいて少なくとも1%乃至100%重量部の量が一つの多孔分散管へ添加され、希釈スチームがあるならば、これは更なる多孔分散管で前記加熱原料へ加えられる方法。 - 請求項1の方法において、水が少なくとも3%重量部の量で加えられる方法。
- 請求項1又は2の方法において、水が少なくとも10%重量部の量で加えられる方法。
- 請求項1、2又は3の方法において、水が少なくとも30%重量部の量で加えられる方法。
- 請求項1乃至4の何れか一項に記載の方法において、希釈スチームの追加があるならば、それよりも水の追加を優先させる方法。
- 請求項1乃至5の何れか一項に記載の方法において、加熱原料へ加えられた水とスチームとの比は、少なくとも1つのパラメータにおける変動に応じて変化する方法。
- 請求項6記載の方法において、前記炉は排ガス区画、対流区画及び輻射区画を含み、前記パラメータは温度である方法。
- 請求項7記載の方法において、前記パラメータが前記炉の前記排ガス区画における混合体の温度である方法。
- 請求項7記載の方法において、前記パラメータが前記炉の前記対流区画におけるガスの温度である方法。
- 請求項7記載の方法において、結果的な加熱された混合体が前記炉の輻射区画へ供給されて、前記パラメータが、前記結果的な加熱された混合体の前記炉の輻射区画へ入る前の温度である方法。
- 請求項7乃至10の何れか一項に記載の方法において、ガスは345℃(650°F)未満の温度で前記炉の前記排ガス区画を出る方法。
- 請求項7乃至11の何れか一項に記載の方法において、ガスは230℃(450°F)未満の温度で前記炉の前記排ガス区画を出る方法。
- 請求項7乃至12の何れか一項に記載の方法において、ガスは175℃(350°F)未満の温度で前記炉の前記排ガス区画を出る方法。
- 請求項1乃至13の何れか一項に記載の方法において、前記一つの多孔分散管と前記更なる多孔分散管とは、一つの多孔分散管アセンブリの部分である方法。
- 請求項14に記載の方法において、前記一つの多孔分散管と前記更なる多孔分散管とは流体連通して直列に接続されている方法。
- 請求項1乃至15の何れか一項に記載の方法において、前記一つの多孔分散管と前記更なる多孔分散管との各々は、内側多孔導管を含み、これは外側導管に包囲されて、前記内側導管と外側導管との間に環状流空間を形成する方法。
- 請求項1乃至16の何れか一項に記載の方法において、前記炉がスチーム分解炉である方法。
- 請求項1に記載の方法において、前記炉は、輻射熱と高温排ガスとを生成するバーナーを含む輻射区画と、熱交換管を含む対流区画とを備え、この方法は、
(a)炭化水素原料を前記対流区画における前記熱交換管内で前記輻射区画からの高温排ガスによる間接的熱交換によって加熱して加熱原料を与え、
(b)第1の多孔分散管における加熱原料に水を添加し、第2の多孔分散管における加熱原料に希釈スチームを添加して原料混合体を形成し、
(c)原料混合体を前記対流区画における前記熱交換管内で前記輻射区画からの高温排ガスによる間接的熱交換によって加熱して加熱原料混合体を形成し、
(d)この加熱された混合体を前記輻射区画へ供給し、その加熱原料混合体における炭化水素は熱分解されて生成物を形成することを含む方法。 - 請求項18に記載の方法において、前記希釈スチームの添加に先立って水を前記加熱原料へ添加する方法。
- 請求項18又は19に記載の方法において、第1多孔分散管は、外側導管に囲まれた内側多孔性導管を備えることにより、内側導管と外側導管との間に環状流空間を形成している方法。
- 請求項20に記載の方法において、加熱原料は環状流空間を通じて流れ、水は内側導管を通じて流れて、その内側導管の多孔を通じて加熱原料へ注入される方法。
- 請求項18乃至21の何れか一項に記載の方法において、第2多孔分散管は、外側導管に囲まれた内側多孔性導管を備えることにより、内側導管と外側導管との間に環状流空間を形成している方法。
- 請求項18乃至22の何れか一項に記載の方法において、第1多孔分散管からの原料は前記環状流空間を通じて流れ、希釈スチームは前記内側導管を通じて流れて、その内側導管の多孔を通じて原料混合体へ注入される方法。
- 請求項18乃至22の何れか一項に記載の方法において、第1と第2の多孔分散管が多孔分散管アセンブリの部分をなし、このアセンブリでは第1と第2の多孔分散管が直列に流体連通して接続される方法。
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US10/189,618 US7097758B2 (en) | 2002-07-03 | 2002-07-03 | Converting mist flow to annular flow in thermal cracking application |
US10/188,461 US7138047B2 (en) | 2002-07-03 | 2002-07-03 | Process for steam cracking heavy hydrocarbon feedstocks |
US10/188,901 US7090765B2 (en) | 2002-07-03 | 2002-07-03 | Process for cracking hydrocarbon feed with water substitution |
PCT/US2003/020377 WO2004005432A1 (en) | 2002-07-03 | 2003-06-27 | Process for cracking hydrocarbon feed with water substitution |
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