CN1958743A - 一种高温气体与液渣颗粒的混合物排出口 - Google Patents

一种高温气体与液渣颗粒的混合物排出口 Download PDF

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CN1958743A
CN1958743A CN 200610137886 CN200610137886A CN1958743A CN 1958743 A CN1958743 A CN 1958743A CN 200610137886 CN200610137886 CN 200610137886 CN 200610137886 A CN200610137886 A CN 200610137886A CN 1958743 A CN1958743 A CN 1958743A
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CN100523145C (zh
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郭进军
郭强
宋晓峰
安兵涛
高瑞恒
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Changzheng Engineering Co Ltd
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Beijing Aerospace Petrochemical Technology and Equipment Engineering Corp Ltd
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Abstract

一种高温气体与液渣颗粒的混合物排出口，其排出口最外层为螺旋盘管水冷壁，螺旋盘管内通冷却介质，冷却介质从盘管下方进入，上方流出；水冷壁内侧均匀涂抹一层耐火浇注料；工作状态下部分液渣颗粒在耐火浇注料内侧形成固态渣层和液态渣层，排出口中心通过高温气体和其余液渣颗粒；排出口的出口通道截面均为圆形，排出口剖面为“X”型结构，其中收拢角度α为80°～120°，扩口角度β为30°～60°。本发明具有耐高温，使用寿命长，堵塞几率低，结构简单紧凑，适用范围广泛的优点。

Description

一种高温气体与液渣颗粒的混合物排出口
技术领域
本发明涉及一种混合物排出口，特别是用于以煤粉为燃料，排出生成产物的高温合成气和液态渣颗粒的混合物排出口。
背景技术
现有的煤气化技术中，以Texaco与Shell的工艺比较成熟，在国内很多厂家得到应用，两者在出料口设计方面各有特色。其中Texaco气化炉合成气与渣都从气化室底部出料口排出，气化室与出料口均以耐火砖为衬里，来承受气化室内的高温。这种结构为Texaco气化炉带来局限：耐火砖在高温条件下很容易被参与气化反应的多相物质流冲蚀，每隔两年需花40天左右时间更换一套价值数十万美元的耐火砖，并烘炉20天左右，代价很大。为了延长耐火砖使用寿命，必须控制Texaco气化炉内温度较低，从而造成C转化率相对较低，冷煤气效率较低；必须选用灰熔点低和灰粘度适宜的煤种，原料煤选择范围相对较窄。
Shell气化炉合成气从炉体上部排出到输气管，进而排入合成气冷却器。渣以液渣的形式从炉体下部出料口排出，经激冷水喷淋后落入渣池。出料口结构非常复杂，其上半部分为列管式倒锥形水冷壁，下半部分为盘管式热裙。气渣分离排出方式是由Shell气化炉特殊的炉体结构决定的，其气化过程是由布置在炉体中下部的4～8个烧嘴在炉内形成对冲火焰完成的，产物合成气利用自身浮力从上部排出，液渣利用重力从下部排出，这种方式并不适合一切炉型，尤其不适合烧嘴顶置，合成气与液渣混合排出的炉型。
发明内容
本发明的技术解决问题是：克服现有技术的不足，提供一种耐高温，使用寿命长，堵塞几率低，结构简单紧凑，适用范围广泛的高温气体和液态渣颗粒混合物排出口。
本发明的技术方案：一种高温气体和液态渣颗粒混合物排出口，其特征在于：排出口最外层为螺旋盘管水冷壁，螺旋盘管内通冷却介质，冷却介质从盘管的一端进入，另一端流出；水冷壁内侧均匀涂抹一层耐火浇注料；工作状态下部分液渣颗粒在耐火浇注料内层形成固态渣层和液态渣层，排出口中心通过高温气体和其余液渣颗粒。
本发明的原理：以烧嘴顶置，合成气与液渣颗粒混合排出的气化炉为例。当气化炉启动后，煤粉颗粒与氧气发生剧烈气化反应，当温度约1500℃的气化产物—合成气与液渣颗粒的混合物通过排出口时，部分液渣沉降在收口处，碰到由内通冷却介质的水冷壁保护的，温度较低的耐火浇注料层，固化形成固态渣层，不断增加的固态渣层增大了热阻，导致固态渣层表面温度上升，最终超过渣的相变温度，进而形成了液态渣层，达到平衡后，形成固液两层渣，其余液渣随高温合成气从排出口中心排出。收口壁面的液渣层均匀稳定的流过排出口的喉口后，部分继续贴壁面布满扩口内壁，部分从喉口脱落。本发明充分发挥了“以渣抗渣”的功能，利用布满排出口内壁的固渣层和液渣层来抵抗高温气体和熔渣对耐火材料的腐蚀，大大延长了排出口的使用寿命。水冷壁是形成固、液两层渣的关键，同时也保护外围炉壳不超温。
本发明与现有技术相比的优点在于：
(1)“以渣抗渣”，利用炉子自身产生的渣形成渣层，抵抗高温气体和熔渣对耐火材料的腐蚀；
(2)设置有剖面为“X”型的水冷壁结构，保证渣颗粒落在排出口处能形成渣层并顺利排出，保证外围炉壳不超温，大大延长了排出口的使用寿命；
(3)水冷壁内侧均匀涂抹一层耐火材料，耐火浇注料要耐冲刷，相变温度要高于渣的相变温度，保证渣能在浇注料层内侧形成固渣层和液渣层，从而保护水冷壁不直接承受高温气体和液渣颗粒冲刷产生的应力和腐蚀，缓解了水冷壁的压力，同样延长了排出口的使用寿命；
(4)该排出口适宜的炉型广泛，凡生成产物为高温气体和液渣颗粒，并混合后一起通过排出口的炉型皆可使用该排出口；
附图说明
图1为本发明的结构示意图；
图2为图1中螺旋盘管水冷壁示意图。
图中，1.螺旋盘管水冷壁出口，2.螺旋盘管水冷壁，3.冷却介质，4.耐火浇注料，5.固态渣层，6.液态渣层，7.液态渣颗粒，8.高温气体，9.螺旋盘管水冷壁进口，10.外围炉壳
具体实施方式
如图1所示，本发明排出口外面为外围炉壳10，排出口最外层为螺旋盘管水冷壁2，冷却介质3从螺旋盘管水冷壁进口9进入，流过螺旋盘管水冷壁2后从螺旋盘管水冷壁出口1流出；螺旋盘管水冷壁2内层均匀涂抹一层耐火浇注料4；工作状态时，部分液渣颗粒7沉降在螺旋盘管水冷壁2的收口处，遇到温度较低的耐火浇注料层4后固化形成固态渣层5，不断增加的固态渣层增大了热阻，导致固态渣层表面温度上升，最终超过渣的相变温度，进而形成液态渣层6，剩余液渣颗粒7随着高温气体8一起从排出口中心通过。
本发明排出口的出口通道截面应该与炉壳形状保持一致，气化炉多为圆形反应炉，因此排出口的通道截面也多为圆形。排出口为保证渣能均匀的沿水冷壁内侧聚集和流出，将出口剖面设计为“X”型结构，其中收拢角度α为80°～120°，扩口角度β为30°～60°。收拢段与扩口段的衔接区也可增加一小段直过渡段。耐火浇注料4由于耐高温和耐冲刷的原因，选择其主要成分为SiC，冷却介质3通常为冷却水。

Claims (4)

1、一种高温气体与液态渣颗粒混合物排出口，其特征在于：排出口最外层为螺旋盘管水冷壁，螺旋盘管内通冷却介质，冷却介质从螺旋盘管一端进入，另一端流出；螺旋盘管水冷壁内侧均匀涂抹一层耐火浇注料。
2、根据权利要求1所述的混合物排出口，其特征在于：所述的冷却介质从螺旋盘管下方进入，上方流出。
3、根据权利要求1所述的混合物排出口，其特征在于：所述的耐火浇注料主要成分为SiC，其厚度为5～20mm。
4、根据权利要求1所述的混合物排出口，其特征在于：所述的排出口出口通道截面均为圆形，其剖面为“X”型结构，其中收拢角度α为80°～120°，扩口角度β为30°～60°。
CN 200610137886 2006-11-09 2006-11-09 一种高温气体与液渣颗粒的混合物排出口 Active CN100523145C (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106833746A (zh) * 2017-02-22 2017-06-13 中国寰球工程有限公司 一种溢流型含杂质高温气体连通器
CN114686269A (zh) * 2020-12-27 2022-07-01 新疆宜化化工有限公司 一种避免炉底焦渣与石英砂固化形成板结体的循环流化床煤气化炉

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106833746A (zh) * 2017-02-22 2017-06-13 中国寰球工程有限公司 一种溢流型含杂质高温气体连通器
CN114686269A (zh) * 2020-12-27 2022-07-01 新疆宜化化工有限公司 一种避免炉底焦渣与石英砂固化形成板结体的循环流化床煤气化炉

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