CN101724472B - Technology for removing tar from raw gas containing coal tar - Google Patents
Technology for removing tar from raw gas containing coal tar Download PDFInfo
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- CN101724472B CN101724472B CN 200910273320 CN200910273320A CN101724472B CN 101724472 B CN101724472 B CN 101724472B CN 200910273320 CN200910273320 CN 200910273320 CN 200910273320 A CN200910273320 A CN 200910273320A CN 101724472 B CN101724472 B CN 101724472B
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Abstract
The invention discloses a technology for removing tar from raw gas containing coal tar, solving the problems of wastewater generation, environment pollution and high cost of equipment investment and production operation in the current technology for removing tar. The technical scheme adopted by the invention is as follows: firstly, feeding the raw gas containing coal tar in a chilling tower to contact with coal tar from a cooler in a countercurrent manner for washing and cooling, enabling the raw gas after tar removing and cooling to enter in an electrical tar precipitator, precipitating the coal tar once again and feeding to the downstream procedure; and transmitting the coal tar at the bottom of the chilling tower in the cooler for cooling by a circulating pump, and feeding in the chilling tower for recycling. The invention has the advantages of simple technology, no consumption of fresh water, no generation of wastewater, and capability of producing coal tar byproducts, and has wide market application prospect.
Description
Technical field
The present invention relates to a kind of gas purification process of chemical industry, be specifically related to a kind of tar removing technique that contains coal tar crude coal gas.
Background technology
Usually contain part coal tar in the raw gas of coal gasification (fixed bed gasification) and process of coking production, before entering lower procedure, need the coal tar that first raw gas purifying contained with removing, the gas purification process utilizes the method for washing to wash, cool off raw gas usually at present, washing gas liquor and gas liquor are mixed the waste water that formation contains the impurity such as tar, phenol, ammonia in a large number, must first the oil in the water, phenol, ammonia etc. be separated, reclaim before this discharge of wastewater, just can reach the water inlet requirement of general method of wastewater treatment.
Strange fixed bed gasifying process process is example take the Shandong, the coal tar crude coal gas (about 650 ℃) that contains that gasification furnace produces at first enters the Venturi scrubbing cooler by high-pressure injection water washing, dedusting, cooling, at this raw gas by Quench to 200 ℃, then raw gas advances waste heat boiler recovery heat, technique wash cooling water after gas liquor is converged with the washing gas liquor is delivered to Venturi scrubbing cooler circulation cleaning raw gas through tar, light oil separate rear part lease making gas liquor circulating pump, and unnecessary part drains into waste water water treatment operation as waste water.With reference to Fig. 2, as progressively process phenol, the ammonia recovery of redundance of waste water, discharging after the technical process such as biochemical treatment are processed.Can find out from above-mentioned flow process, be the technique waste water that produces in the gas treatment purification process, need to increase the wastewater treatment equipment of series of complex, not only increase investment and the production cost of enterprise, also be unfavorable for environmental protection.
Summary of the invention
To the objective of the invention is in order solving the problems of the technologies described above, to provide that a kind of technique is simple, running cost is low, equipment investment is little, the coal tar in the raw gas is removed the tar removing technique that contains coal tar crude coal gas effective, that produce without waste water.
Technical solution of the present invention comprises that at first will contain coal tar crude coal gas sends into quenching column and wash, cool off from the coal tar counter current contacting of cooler, and the preliminary cooled raw gas of decoking enters electrical tar precipitator by cat head to carry out sending into lower procedure after coal tar captures again; Coal tar at the bottom of the quenching column is sent into quenching column again and is recycled after circulating pump is delivered to the cooler cooling.
Controlling the cooled raw gas of described preliminary decoking goes out the quenching column temperature and is higher than 5～8 ℃ of dew-point temperatures.
The part of cooled coal tar is sent into the coal tar basin as byproduct in the described cooler.
Adopt coal tar to replace water as the medium of washing and cooling raw gas, according to the similar principle that mixes, tar is easier that coal tar wet goods organic matter in the coal gas is washed in washing; The temperature that control coal gas goes out quenching column to avoid the condensation of moisture in the coal gas, does not produce waste water from source control on dew-point temperature, reduce wastewater treatment difficulty and cost, and described dew-point temperature can calculate according to the moisture in the raw gas that records.In addition, with the cooled raw gas of preliminary decoking further tar removing in electrical tar precipitator, can guarantee to send in the raw gas of lower procedure tar content less than 1ppm.Owing to be the high coal tar of purity in the cooler, except guaranteeing that supplying with quenching column is used for the wash cooling raw gas, redundance can directly be sent to the coal tar basin as byproduct.
Beneficial effect:
1, process using coal tar replacement water of the present invention enters quenching column raw gas is washed, it is effective to utilize the similar principle that mixes to remove coal tar, the recycling electrical tar precipitator carries out secondary and catches Jiao, can effectively the coal tar in the raw gas be removed, the coal tar content after processing in the raw gas is less than 1ppm.This technique no matter be the raw gas that produces of semicoke process or coal gasification field for example the strange gasification in Shandong produce to contain coal tar crude coal gas all applicable.
2, adopt coal tar as cooling, washing medium, do not consume fresh water, to also not producing waste water behind the raw gas wash cooling, thereby thoroughly save whole waste water treatment process, do not caused the harm to environment, and can also obtain the coal tar byproduct, compare except coal tar technique with existing raw gas, water saving, energy-conservation, reduce the aspects such as investment and production cost extremely outstanding advantage arranged, be specially adapted to the high raw gas purifying of coal tar content.Take the strange gasifying process in Shandong of 950 tons/day of coal feeding amounts as example, as adopt present technique to purify raw gas, owing to save water-oil separating, the recovery of ammonia phenol and wastewater treatment equipment, can reduce investment outlay about 3,000 ten thousand yuan, save about 2,000,000 yuan/year of production run expense, byproduct coal tar can bring benefits about 1,700 ten thousand yuan/year.
Description of drawings
Fig. 1 is process chart of the present invention.
Wherein, 1-quenching column, 2-circulating pump, 3-cooler, 4-electrical tar precipitator.
The specific embodiment
Embodiment: the raw gas that produces take the semicoke process is as example, with reference to Fig. 1, the tar raw gas (about 361 ℃) that contains that the semicoke process produces enters quenching column 1, with coal tar (the about 71 ℃) counter current contacting of circulation from cooler 3, containing the tar raw gas is washed, be cooled to 76-78 ℃ (in the present embodiment, dew-point temperature is 73 ℃ as calculated), wherein most of coal tar dissolves in the next coal tar of circulation and sinks to quenching column 1 bottom, the preliminary cooled raw gas of tar removing enters electrical tar precipitator 4 by quenching column 1 cat head, under coal tar in this raw gas is almost all captured, the coal tar that captures is back to quenching column 1 bottom, goes out the raw gas fed downstream operation of electrical tar precipitator 4; Coal tar reaches from the coal tar mixing (about 146 ℃) of electrical tar precipitator and sends into cooler 3 by circulating pump 2 after the quenching column 1 bottom wash heat exchange, being recycled cooling water further cools off and (is cooled to about 71 ℃, described recirculated cooling water is from other operation of semicoke), cooled coal tar is guaranteeing that being circulated to quenching column 1 contains outside the consumption of coal tar crude coal gas for wash cooling, and redundance is sent to the coal tar basin as the coal tar byproduct.Temperature sensor can be established in described quenching column 1 top, enters the coal tar oil mass that quenching column 1 circulates according to the variation control that goes out tower raw gas temperature that records, and is higher than dew-point temperature to guarantee tower exit temperature; Detect liquid measure in the tower by the quenching column 1 interior liquid level gauge that arranges, thereby the coal tar oil mass of the redundance of coal tar basin is sent in control.Described cooler 3 can adopt shell-and-tube heat exchanger.Described quenching column 1 can adopt packed tower.Described circulating pump 2 can adopt centrifugal pump.Coal tar during driving can use first the coal tar of outsourcing.
Claims (2)
1. tar removing technique that contains coal tar crude coal gas, it is characterized in that, at first will contain coal tar crude coal gas and send into quenching column and wash, cool off from the coal tar counter current contacting of cooler, the preliminary cooled raw gas of decoking enters electrical tar precipitator by cat head to carry out sending into lower procedure after coal tar captures again; Coal tar at the bottom of the quenching column is sent into quenching column again and is recycled after circulating pump is delivered to cooler cooling, control the cooled raw gas of described preliminary decoking and go out the quenching column temperature and be higher than 3～5 ℃ of its dew-point temperatures.
2. a kind of tar removing technique that contains the tar raw gas as claimed in claim 1 is characterized in that, the part of cooled coal tar is also sent into the coal tar basin in the described cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910273320 CN101724472B (en) | 2009-12-18 | 2009-12-18 | Technology for removing tar from raw gas containing coal tar |
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| CN 200910273320 CN101724472B (en) | 2009-12-18 | 2009-12-18 | Technology for removing tar from raw gas containing coal tar |
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| CN101724472A CN101724472A (en) | 2010-06-09 |
| CN101724472B true CN101724472B (en) | 2013-03-13 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102229806B (en) * | 2011-05-24 | 2013-03-27 | 金能科技股份有限公司 | Green circular economy technology with coal coking as the main part |
| CN102492490A (en) * | 2011-11-30 | 2012-06-13 | 中国五环工程有限公司 | Gas purification process and system |
| CN103509608B (en) * | 2012-06-19 | 2015-08-05 | 北京华泰焦化工程技术有限公司 | A kind of raw gas cooling fractionating method and coking device |
| CN103060016B (en) * | 2013-01-18 | 2014-03-19 | 内蒙古乌拉山化肥有限责任公司 | Method for removing tar in process of producing synthetic ammonia by oxygen-enriched gas-producing and gas-making furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030784A (en) * | 1988-06-04 | 1989-02-01 | 河南省安阳钢铁公司 | Indirect two-stage primary cooling technology of coke-oven gas |
| CN101280226A (en) * | 2008-05-13 | 2008-10-08 | 邹平县华星热能环保设备有限公司 | Purification and cooling method for hot dirty high-temperature gas |
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2009
- 2009-12-18 CN CN 200910273320 patent/CN101724472B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030784A (en) * | 1988-06-04 | 1989-02-01 | 河南省安阳钢铁公司 | Indirect two-stage primary cooling technology of coke-oven gas |
| CN101280226A (en) * | 2008-05-13 | 2008-10-08 | 邹平县华星热能环保设备有限公司 | Purification and cooling method for hot dirty high-temperature gas |
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