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Method for preparing slurry fuel by cascade utilization of coal conversion wastewater

A waste water and fuel technology, applied in the direction of liquid carbon-containing fuel, fuel, petroleum industry, etc., can solve the problems of complex composition of coal conversion waste water, difficulty in unified treatment and recovery methods, etc., achieve obvious social and economic benefits, and avoid adverse effects , the effect of promoting gasification and combustion reactions

Active Publication Date: 2018-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the complex composition of coal conversion wastewater, which contains various organic and inorganic substances, it is difficult to adopt a unified treatment and recovery method. Therefore, it is imminent to develop a cascade treatment and recycling technology suitable for different components and substances in wastewater.

Method used

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  • Method for preparing slurry fuel by cascade utilization of coal conversion wastewater
  • Method for preparing slurry fuel by cascade utilization of coal conversion wastewater
  • Method for preparing slurry fuel by cascade utilization of coal conversion wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The water quality analysis of the coal conversion wastewater treated in this embodiment is shown in the following table:

[0038]

[0039]

[0040] The specific implementation steps are as follows:

[0041] (1) In the sedimentation device, add ferrous sulfate and polyacrylamide to the coal conversion wastewater, the addition amount is 1.8g / L and 1.3mg / L respectively, let it stand for 1h, waste tar, water and sludge are separated into three phases layer.

[0042] (2) Separating out the upper strata waste oil of waste water after step (1) treatment, obtain the tar containing moisture 15% after the separation of oil-water separator again, add in the emulsification tank and be the polyvinyl alcohol of 0.8% with the mass ratio of tar, Prepare energy-saving and environment-friendly high-quality emulsified oil with a viscosity of 1180mPa.s, meeting the requirements of industrial applications, and store it in an oil storage tank for standby. The waste water separated by...

Embodiment 2

[0046] The water quality analysis of the coal conversion wastewater treated in this embodiment is shown in the following table:

[0047] Main components in coal conversion wastewater

Content (mg / L)

phenol

12

COD cr

210

Ammonia nitrogen

382

BOD 5

105

Sulfate

315

Petro

11

Suspended solids

45

[0048] The specific implementation steps are as follows:

[0049] (1) In the sedimentation device, add ferrous sulfate and polyacrylamide to the coal conversion wastewater, the addition amount is 1.2g / L and 0.7mg / L respectively, let it stand for 1h, waste tar, water and sludge are separated into three phases layer.

[0050] (2) Separating the waste oil in the upper strata of the waste water after step (1) treatment, and then obtaining tar with a moisture content of 5% after being separated by an oil-water separator, adding polyvinyl alcohol with a tar mass ratio of 0.4% in an emulsification tank, ...

Embodiment 3

[0055] The water quality analysis of the coal conversion wastewater treated in this embodiment is shown in the following table:

[0056] Main components in coal conversion wastewater

Content (mg / L)

phenol

1220

COD cr

12230

Ammonia nitrogen

4210

BOD 5

2560

Sulfate

1130

Petro

245

Suspended solids

2210

[0057] The specific implementation steps are as follows:

[0058] (1) In the sedimentation device, add ferrous sulfate and polyacrylamide to the coal conversion wastewater, the addition amount is 1.5g / L and 1mg / L respectively, let stand for 1h, waste tar, water, sludge three-phase separation .

[0059] (2) Separating the waste oil in the upper strata of the waste water after step (1) treatment, and then obtaining tar with a moisture content of 10% after being separated by an oil-water separator, adding polyvinyl alcohol with a tar mass ratio of 0.6% in an emulsification tank, Prepare ene...

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Abstract

The invention relates to a technique for coal conversion wastewater treatment and recycling, and aims at providing a method for preparing a slurry fuel by coal conversion wastewater gradient utilization. The method comprises the following steps of coagulating the coal conversion wastewater, so as to separate three phases of water-containing tar, wastewater and sludge, wherein the tar separated from the water-containing tar is used for preparing emulsifying oil with fluidity, the sludge is filtered and treated to obtain filter residues and sludge slurry with fluidity, and the sludge slurry is used for gasifying or incinerating; blending and mixing the wastewater, pulverized coal, a coal water slurry additive, and the wastewater and residues obtained by separating, so as to prepare the coal water slurry; after the gasified wastewater produced by a gasifying furnace or a boiler is congealed, mixing into the coal conversion wastewater to coagulate, so as to realize the recycling function. The method has the advantages that the three phases of waste tar, waste liquid and sludge in the coal conversion wastewater are utilized in a gradient way, the pollution to the environment by the coal conversion wastewater is decreased, the caloric value of the wastewater is fully utilized, a large amount of slurry preparation water is saved, and the combustion and gasifying property of the coal water slurry is promoted.

Description

technical field [0001] The invention belongs to the technical field of coal conversion wastewater treatment and recycling. Specifically, the invention relates to a technical route and process for preparing slurry fuel from different components of coal conversion wastewater and realizing cascaded resource utilization of wastewater. Background technique [0002] With the adjustment of the world's energy structure, oil resources are facing depletion, and the utilization rate of fossil fuels has also declined. However, coal accounts for 70% to 80% of my country's energy production structure, which determines the role of coal in my country's energy structure. leading position. Coal chemical industry is an effective means to realize efficient utilization of coal resources and an important part of clean utilization of coal. Coal chemical industry refers to the process of using coal as raw material and converting coal into gas, liquid and solid fuels and chemicals through chemical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
CPCC10L1/326
Inventor 刘建忠程军王智化何勇杨卫娟张彦威周志军黄镇宇周俊虎岑可法
Owner ZHEJIANG UNIV
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