CN106477811A - 焦粉处理焦化废水并联产蒸汽的工艺 - Google Patents

焦粉处理焦化废水并联产蒸汽的工艺 Download PDF

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CN106477811A
CN106477811A CN201610942054.9A CN201610942054A CN106477811A CN 106477811 A CN106477811 A CN 106477811A CN 201610942054 A CN201610942054 A CN 201610942054A CN 106477811 A CN106477811 A CN 106477811A
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coke powder
coking
waste water
wastewater
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李启超
詹茂华
程寒飞
安忠义
刘训东
安浩
白扬
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Huatian Engineering and Technology Corp MCC
MCC Huatian Anhui Energy Conservation and Environmental Protection Research Institute Co Ltd
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Abstract

本发明公开一种焦粉处理焦化废水并联产蒸汽的工艺，主要针对现有技术下的焦粉和焦化废水处理不便的问题，提出了一种处理效率高、成本低的焦粉处理焦化废水并联产蒸汽的工艺，包括如下步骤：1)收集炼焦过程中产生的焦粉，2)利用所述焦粉吸附净化焦化废水，所述焦粉成为废焦粉，所述焦化废水成为初级处理废水，3)将所述初级处理废水进行生化处理，将所述废焦粉在锅炉中进行燃烧，4)利用所述锅炉的脱硫脱硝工艺和除尘工艺对废焦粉燃烧产生的烟气进行处理。本发明投资低，运行成本低廉，能够大大提高焦化企业的经济效益。

Description

焦粉处理焦化废水并联产蒸汽的工艺
技术领域
本发明涉及一种焦粉处理焦化废水并联产蒸汽的工艺。
背景技术
焦化废水中含有大量的有机污染物和无机污染物，其中有机污染物包括苯酚、苯、甲苯和溶剂油等，无机污染物包括氰化氢、硫化氢和氨等，另外还包括一些固体残渣。在处理这些污染物的过程中需经过多级的处理，该过程极为复杂，操作成本高。同时由于焦化废水中的有机污染物量极大，生化处理所耗时间极长，对处理过程中的温度和pH要求极高。因此有必要提出一种新型的焦化废水处理工艺。
在炼焦过程中会产生2.0％～4.5％粒径小于10mm细焦粉，这些细焦粉由于粒度过小不能用于钢铁或者电石的生产。工业上一般将其掺混进煤炭中再次进行炼焦。
炼焦之后产生的细焦粉由于其中的水分和挥发性有机物已经经过高温热解过程排出，内部形成大面积的多孔结构，因而具有极强的吸附性能。如果能够用这些细焦粉来吸附净化焦化废水将极大的提高废水的处理效率，简化废水处理工艺流程，减少后续生化处理过程的压力，大大降低生产成本。同时将处理之后的废焦粉用于粉煤锅炉燃烧，既能够产生工业生产中必须的蒸汽，也能将污染物转移到锅炉工艺中，利用锅炉的脱硫脱硝和除尘系统进行处理。
发明内容
针对上述问题，本发明提供一种运行效率高、生产成本低的焦粉处理焦化废水并联产蒸汽的工艺。
为达到上述目的，本发明焦粉处理焦化废水并联产蒸汽的工艺包括如下步骤：
1)收集炼焦过程中产生的焦粉，
2)利用所述焦粉吸附净化焦化废水，所述焦粉成为废焦粉，所述焦化废水成为初级处理废水，
3)将所述初级处理废水进行生化处理，将所述废焦粉在锅炉中进行燃烧，
4)利用所述锅炉的脱硫脱硝工艺和除尘工艺对废焦粉燃烧产生的烟气进行处理。
进一步地，所述焦粉在吸附净化焦化废水前进行研磨和筛分。
进一步地，所述焦粉在吸附净化焦化废水前进行活化处理：将焦粉放置在容器中，向容器中通入水蒸汽。
进一步地，在所述焦粉吸附净化焦化废水时，搅拌焦化废水与焦粉的混合物。
进一步地，所述焦粉吸附净化焦化废水完毕后，对焦粉和焦化废水的混合物进行固液分离，固液分离时采用沉淀、过滤或旋流的方式进行固液分离。
进一步地，固液分离完毕后，采用压滤的方式将废焦粉中的水分除去。
进一步地，所述废焦粉与煤粉混合后在锅炉中进行燃烧，废焦粉与煤粉混合时的比例为1:1～1:9。
本发明的焦粉处理焦化废水并联产蒸汽的工艺具有以下优点：吸附净化的原料采用炼焦产生的焦粉，来源广泛，价格低廉，吸附性能好。该工艺流程简单，效率高，减轻后续废水深度净化过程中的负荷。在处理废水的同时能够同时联产蒸汽，另外将大部分污染物转移到锅炉中燃烧处理，燃烧产生的污染物能够利用锅炉工艺中的脱硫脱硝和除尘系统进行处理。本发明投资低，运行成本低廉，能够大大提高焦化企业的经济效益。
附图说明
图1是本发明中焦粉处理焦化废水并联产蒸汽的工艺流程图；
图2是本发明中一种利用焦粉处理焦化废水并联产蒸汽的具体工艺流程图。
具体实施方式
下面结合说明书附图对本发明做进一步的描述。
实施例1
如图1所示，本实施例提供一种焦粉处理焦化废水并联产蒸汽的工艺，包括如下步骤：
1)收集炼焦过程中产生的焦粉，
2)利用所述焦粉吸附净化焦化废水，所述焦粉成为废焦粉，所述焦化废水成为初级处理废水，
3)将所述初级处理废水进行生化处理，将所述废焦粉在锅炉中进行燃烧，
4)利用所述锅炉的脱硫脱硝工艺和除尘工艺对废焦粉燃烧产生的烟气进行处理。
具体操作步骤如图2所示，炼焦过程中产生的细焦粉经过充分研磨后利用水蒸气在750～900℃充分活化。活化之后产生的活性焦与焦化废水在搅拌装置的协助下充分混合吸附废水中的有机废物和无机废物。
吸附净化之后的废水经过过滤装置分离为净化废水和废焦粉。其中净化废水经过生化深度处理达到合格标准，再次进行回用或者排放。
废焦粉经过压滤机压滤，除去多余的水分。而后进入锅炉中进行燃烧，产生大量的蒸汽，提供工业和生活利用。苯酚、苯、甲苯和溶剂油等有机污染物在燃烧过程转化为二氧化碳和水排放，因而不会对大气造成污染。氰化氢、硫化氢、氨等无机污染物和含氮、含硫等有机物在燃烧过程中产生的二氧化硫和氮氧化物可以经过锅炉工艺中的脱硫脱硝系统净化。固体残渣中的碳可以被燃烧掉，其中的不可燃物作为炉渣被处理，气体中的固体物质经过除尘系统被处理。
本实施例的焦粉处理焦化废水并联产蒸汽的工艺具有以下优点：吸附净化的原料采用炼焦产生的焦粉，来源广泛，价格低廉，吸附性能好。该工艺流程简单，效率高，减轻后续废水深度净化过程中的负荷。在处理废水的同时能够同时联产蒸汽，另外将大部分污染物转移到锅炉中燃烧处理，燃烧产生的污染物能够利用锅炉工艺中的脱硫脱硝和除尘系统进行处理。本实施例投资低，运行成本低廉，能够大大提高焦化企业的经济效益。
实施例2
在上述实施例的基础上，本实施例提供一种焦粉处理焦化废水并联产蒸汽的工艺，与实施例1不同之处在于：本实施例中的所述废焦粉与煤粉混合后在锅炉中进行燃烧，废焦粉与煤粉混合时的比例按照1:9进行混合。
本实施例将废焦粉与煤粉进行混合后再进行燃烧，首先能够将废焦粉和焦化废水合二为一进行处理，其次，将煤粉和废焦粉进行混合后燃烧，能够保证混合物的热值与煤粉接近，不会使锅炉的热量来源发生大幅度波动。
在上述实施例的基础上，吸附净化后的废水还可以通过沉淀或者旋流的方式与废焦粉进行分离。
以上，仅为本发明的较佳实施例，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求所界定的保护范围为准。

Claims (7)

1.一种焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：包括如下步骤：
1)收集炼焦过程中产生的焦粉，
2)利用所述焦粉吸附净化焦化废水，所述焦粉成为废焦粉，所述焦化废水成为初级处理废水，
3)将所述初级处理废水进行生化处理，将所述废焦粉在锅炉中进行燃烧，4)利用所述锅炉的脱硫脱硝工艺和除尘工艺对废焦粉燃烧产生的烟气进行处理。
2.如权利要求1所述处理废焦粉焦化废水并联产蒸汽的工艺，其特征在于：所述焦粉在吸附净化焦化废水前进行研磨和筛分。
3.如权利要求1所述焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：所述焦粉在吸附净化焦化废水前进行活化处理：将焦粉放置在容器中，向容器中通入水蒸汽。
4.如权利要求1所述焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：在所述焦粉吸附净化焦化废水时，搅拌焦化废水与焦粉的混合物。
5.如权利要求1所述焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：所述焦粉吸附净化焦化废水完毕后，对焦粉和焦化废水的混合物进行固液分离，固液分离时采用沉淀、过滤或旋流的方式进行固液分离。
6.如权利要求5所述焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：固液分离完毕后，采用压滤的方式将废焦粉中的水分除去。
7.如权利要求1所述焦粉处理焦化废水并联产蒸汽的工艺，其特征在于：所述废焦粉与煤粉混合后在锅炉中进行燃烧，废焦粉与煤粉混合时的比例为1:1～1:9。
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