CN101381149B - Method for repairing pollution of underground coal gasification combustion space area - Google Patents
Method for repairing pollution of underground coal gasification combustion space area Download PDFInfo
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- CN101381149B CN101381149B CN2008101193523A CN200810119352A CN101381149B CN 101381149 B CN101381149 B CN 101381149B CN 2008101193523 A CN2008101193523 A CN 2008101193523A CN 200810119352 A CN200810119352 A CN 200810119352A CN 101381149 B CN101381149 B CN 101381149B
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Abstract
The invention provides a method for pollutant remediation in an underground coal gasification combustion space area, wherein low-concentration hydrogen peroxide is conveyed from the ground to the bottom of a water body in the combustion space area through a drill hole of an abandoned gasification furnace, and the hydrogen peroxide generates OH free radicals in the water, has strong oxidizability, and can oxidize and decompose phenol organic pollutant in wastewater to generate carbon dioxide and water, thereby avoiding groundwater pollution caused by migration and infiltration fundamentally. The method has the advantages that the method has simple technique, short reaction time and high removal efficiency; as strong oxidant, the hydrogen peroxide is easy to decompose without residue after use, thereby secondary pollution can not be caused; and the method can oxidize other organic pollutants which are difficult to degrade while removing phenols in the water simultaneously, so as to achieve good treatment effect. After treatment by the method, the concentration of the phenols in the water body of the combustion space area is reduced to below 2 ppm, so that five types of water quality requirements of groundwater are met.
Description
Technical field
The present invention relates to the underground coal gasification field, particularly a kind ofly remove the method that aerial phenolic comp ' ds pollution is fired in the underground coal gasification of no well formula.
Background technology
Coal underground gasification technology is generally realized by beating coal bed drilling from ground in original coal seam, is the coal mining technology of a safety economy.Yet in the underground coal gasification process, can produce a large amount of phenolic comp ' ds pollution, as: 2,4-dibutyl-phenol and 2,4-dibutyl-6-nitrophenol etc.These materials can enter into coal seam water after gasification finishes, migration afterwards penetrates into body of groundwater, causes groundwater pollution, becomes coal underground gasification technology environment of applications obstacle.In order to control groundwater pollution, must eliminate immediately aldehydes matter in the water body of combustion dead zone.The technology of floor treatment phenolic wastewater is a lot, but mostly adopts biochemical processing process, and technology is loaded down with trivial details, and the treatment time is long, and needs waste treatment, is not suitable for underground 300m even the deeper original position pollution reparation of layer.Therefore be badly in need of wanting a kind of cheaply, simple deep pollutes restorative procedure and handles the residual phenolic comp ' ds pollution in combustion dead zone.The employed material of this treatment process should pollution-free, noresidue.
Summary of the invention
The objective of the invention is to design a kind of underground gasification combustion dead zone phenols and pollute the method that original position is repaired, and provide a kind of phenols oxygenant of easy degraded low residue, design the method for the quick oxygenolysis of a kind of deep-well phenols, stop to fire the groundwater pollution tendency that causes to external migration and infiltration of dead zone pollutent.
The present invention proposes to adopt the method for hydrogen peroxide as phenolic comp ' ds pollution in the underground water in the oxygenant removal localized area, and it makes the problems referred to above be solved, and is a kind of practical invention.Hydrogen peroxide produces the OH free radical in water, have very strong oxidisability, the phenols organic pollutant oxygenolysis in the waste water can be generated carbonic acid gas and water, the groundwater pollution of fundamentally having avoided phenolic comp ' ds pollution migration infiltration to cause.
Technical scheme of the present invention: a kind of hydrogen peroxide is removed the method for phenolic comp ' ds pollution in the underground water as oxygenant, it is characterized in that being this method by following two the part forms: 1. in phenolic wastewater the adding hydrogen peroxide react, because high-concentration phenolic wastewater oxidant consumption amount is big, therefore preferably before processing, at first to carry out extracting from ground, volatile phenol concentration in the phenolic wastewater is reduced, most preferably in the phenolic wastewater volatile phenol concentration near 20mg/L, at this moment, the hydrogen peroxide that adds 1/10th concentration that are about volatile phenol concentration in lower concentration phenolic wastewater (volatile phenol concentration is less than 20mg/L) reacts, with hydrogen peroxide as oxygenant with the various aldehydes matter oxidations in the water body, be decomposed into the small molecules innoxious substance; 2. hydrogen peroxide is entered with waste water by the bottom of water body and mixes, and blasting little air afterwards increases mixing and the accelerated reaction of the two, at last with the stripping oxidation from water body of unnecessary hydrogen peroxide, noresidue.
Above-mentionedly saidly with hydrogen peroxide as oxygenant with the oxidizing condition of the phenolic comp ' ds pollution oxygenolysis in the water be: be 5.5～7.5 at water pH value, under the condition of 0～25 ℃ of temperature, the best dosage of hydrogen peroxide is: the ratio of aldehydes matter concentration (with the volatile phenol metering) and hydrogen peroxide concentration is about 10 to be the best.
Above-mentioned said hydrogen peroxide concentration be in the water body volatile phenol concentration 1/10th, the water yield and scope that the range prediction by surface drilling is handled are further determined the amount of the hydrogen peroxide that adds.
Effect is better in the underground lower concentration phenolic wastewater of above-mentioned said method after conventional extracting.
Using method of the present invention and working process are specially:
1. after vapourizing furnace closed stove, underground water poured in, and at first utilized body of heater boring 4 to carry out extracting from ground, and the extracting time was generally about 48 hours, and phenol concentration is reduced to below the 20mg/L in water body;
2. carry out the water level and the water quality of water level of deep well monitoring and deep-well underground water sampling acquisition combustion dead zone water burst by boring;
3. spacing and the water level by the body of heater surface drilling calculates the area and the water yield that the water pollution of stove district is repaired, and calculates required hydrogen peroxide injection rate according to above-mentioned oxidizing condition.
Wherein,
Pollute the H that repairs required 35% (mass percent)
2O
2Amount, kg; D, the maximum spacing of restoring area boring, m;
W, the lateral extent of gasification, m;
H, the elevation of water surface of combustion dead zone, m;
C
Ph, the concentration of volatile phenol in the water sample of combustion dead zone before handling, mg/L.
4. the dioxygen water yield of distributing each boring needs to inject according to the layout quantity of surface drilling keeps one to two production well, keeps opening wide, as holes 4;
5. hydrogen peroxide injection tube 2 is set in surface drilling, and length will extend to combustion dead zone water bottom always;
6. slowly inject the lower concentration hydrogen peroxide, light will be covered in the aperture;
7. after for some time, generally after 30 to 40 minutes from 3 blasting little air between boring and the hydrogen peroxide water injection pipe, in water body by stripping effect accelerated reaction; And help the self-decomposition of excessive hydrogen peroxide; Air flow control is at 10～20m
3/ h, promote the oxidation agent diffusion and reaction;
8. after reaction for some time, be generally 4 to 5 hours after, stop the drum air, reaction finishes.
Superiority of the present invention is:
1. this method technology is simple, the reaction times short, remove the efficient height;
2. hydrogen peroxide has extremely strong oxidation capacity as a kind of novel oxygenant, the aldehydes matter in can the oxidation water body;
3. hydrogen peroxide uses the back easily to decompose noresidue as strong oxidizer, can not cause secondary pollution;
4. this method is forever removed the phenol in the water, and harmless;
5. this method is in removing water in the phenol, can other Persistent organic pollutants matter of oxidation, reach splendid treatment effect.
After this method processing, the phenol concentration in the water body of combustion dead zone is reduced to below the 2ppm, reaches underground water five class water quality requirements.
Description of drawings
Fig. 1 repairs synoptic diagram for pollution of underground coal gasification combustion space area.
Wherein, the 1-coal seam, 2-hydrogen peroxide injection tube, 3-air injection channel, 4-draws water and exhaust boring, 5-gasification combustion dead zone (underground contaminated area)
Embodiment
Below only be preferred embodiment of the present invention, when not limiting scope of the present invention with this.Promptly the equalization of being done according to the present patent application claim generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
A kind of hydrogen peroxide is removed the method for phenolic comp ' ds pollution in the underground gasification combustion dead zone as oxygenant, it is characterized in that being that this method is made up of following two portions: the hydrogen peroxide that 1. adds 1/10th concentration in lower concentration phenolic wastewater (volatile phenol concentration is less than 20mg/L) reacts, with hydrogen peroxide as oxygenant with the various aldehydes matter oxidations in the water body, be decomposed into the small molecules innoxious substance; 2. hydrogen peroxide is entered with waste water by the bottom of water body and mixes, and blasting little air afterwards increases the mixing accelerated reaction of the two, and unnecessary hydrogen peroxide is carried out the stripping oxidation.
Above-mentionedly saidly as oxygenant be: with the phenolic wastewater oxidation of 20mg/L with the oxidizing condition of the phenol oxygenolysis in the water with hydrogen peroxide, be 5.5～7.5 at water pH value, under the condition of 0～25 ℃ of temperature, the dosage of minimum hydrogen peroxide is: the ratio of volatile phenol concentration and hydrogen peroxide concentration is about 10.By the water yield and the scope that the range prediction of surface drilling is handled, further determine the amount of the hydrogen peroxide of adding.
Utilize the original boring of vapourizing furnace to carry out hydrogen peroxide injection and sewage discharge,, thereby act on two water bodys between the perforation interval because the injection of air can make the hydrogen peroxide of injection spread at a distance.
Claims (1)
1. the pollution of underground coal gasification combustion space area method of repairing is characterized in that, at first will carry out ground extracting phenol concentration to the water body to the combustion dead zone and be reduced to below the 20mg/L after vapourizing furnace closes stove; Add hydrogen peroxide then and react in phenolic wastewater, the dosage of hydrogen peroxide is: with the aldehydes matter concentration of volatile phenol metering and the ratio of hydrogen peroxide concentration is 10; With hydrogen peroxide as oxygenant with the oxidizing condition of the phenolic comp ' ds pollution oxygenolysis in the water be: water pH value 5.5～7.5, temperature are 0 ℃～25 ℃; Thereby and blast the diffusion accelerated reaction that little air quickens hydrogen peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008101193523A CN101381149B (en) | 2008-09-04 | 2008-09-04 | Method for repairing pollution of underground coal gasification combustion space area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101193523A CN101381149B (en) | 2008-09-04 | 2008-09-04 | Method for repairing pollution of underground coal gasification combustion space area |
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| CN101381149A CN101381149A (en) | 2009-03-11 |
| CN101381149B true CN101381149B (en) | 2011-04-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587883B (en) * | 2011-11-29 | 2015-01-07 | 新奥气化采煤有限公司 | Method for quenching underground coal gasifier |
| CN102493840B (en) * | 2011-12-15 | 2014-03-19 | 新奥气化采煤有限公司 | Method for filling underground spaces and system for filling underground spaces |
| US9428978B2 (en) | 2012-06-28 | 2016-08-30 | Carbon Energy Limited | Method for shortening an injection pipe for underground coal gasification |
| US9435184B2 (en) | 2012-06-28 | 2016-09-06 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
| CN103244178B (en) * | 2013-05-20 | 2014-12-10 | 中国矿业大学(北京) | Method for controlling diffusion and migration of underground gasification residual pollutants |
| CN106517538B (en) * | 2016-11-18 | 2019-03-15 | 河南理工大学 | A kind of underground coal gasification(UCG) water pollution purified in situ and restorative procedure |
| CN106522914B (en) * | 2016-11-18 | 2019-02-12 | 中为（上海）化学有限公司 | Underground gasification furnace parking and burned out area restoration processing method for coal underground gasifying technology |
| CN107555690A (en) * | 2017-10-20 | 2018-01-09 | 徐翔 | Water-based metal cutting fluid environmental protection treatment unit and technique |
| CN114856499A (en) * | 2022-05-12 | 2022-08-05 | 重庆大学 | Method for improving yield of coal-bed gas well by generating carbon dioxide through in-situ oxidation |
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Effective date of registration: 20170126 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 065001 Hebei Province Economic Development Zone Langfang City Huaxiang Patentee before: ENN Coal Gasification Co., Ltd. |