CN101724472A - 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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- CN101724472A CN101724472A CN200910273320A CN200910273320A CN101724472A CN 101724472 A CN101724472 A CN 101724472A CN 200910273320 A CN200910273320 A CN 200910273320A CN 200910273320 A CN200910273320 A CN 200910273320A CN 101724472 A CN101724472 A CN 101724472A
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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 contain coal tar crude coal gas remove tar technology.
Background technology
Usually contain part coal tar in the raw gas of gasification (immovable bed gasification) and process of coking production, the coal tar that before entering lower procedure, needs elder generation that raw gas purifying is 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 impurity such as tar, phenol, ammonia in a large number, must earlier 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.
With Shandong strange immovable bed gasifying process process is example, the coal tar crude coal gas (about 650 ℃) that contains that vapourizing furnace produces at first enters the Venturi scrubbing water cooler by high pressure spraying water washing, dedusting, cooling, at this raw gas by Quench to 200 ℃, raw gas advances waste heat boiler recovery heat then, technology washing water coolant after gas liquor is converged with the washing gas liquor is delivered to Venturi scrubbing water cooler circulation cleaning raw gas through tar, light oil separate rear part lease making gas liquor recycle 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, technological processs such as biochemical treatment are handled the back discharging.From above-mentioned flow process as can be seen,, need to increase the wastewater treatment equipment of a series of complexity, not only increased the investment and the production cost of enterprise, also be unfavorable for environment protection for handling the processing wastewater that produces in the gas purification process.
Summary of the invention
The objective of the invention is in order to solve the problems of the technologies described above, provide that a kind of technology is simple, running cost is low, facility investment is little, to the coal tar in the raw gas remove that effective, no waste water produces contain coal tar crude coal gas except that tar technology.
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 contact of water 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 once more; Coal tar at the bottom of the quenching column is sent into quenching column again and is recycled after recycle pump is delivered to the water 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 the coal tar behind the described water cooler internal cooling is sent into the coal tar basin as byproduct.
Adopt coal tar to replace the medium of water as washing and cooling raw gas, according to the similar principle that mixes, tar is easier that coal tar wet goods organism 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 content in the raw gas that records.In addition, the cooled raw gas of preliminary decoking is further removed tar in electrical tar precipitator, can guarantee to send into the coal-tar middle oil content of raw gas of lower procedure less than 1ppm.Because in the water cooler is the high coal tar of purity, except that guaranteeing that supplying with quenching column is used for the washing 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, utilize electrical tar precipitator to carry out secondary again and catch Jiao, can effectively the coal tar in the raw gas be removed, the coal tar content after handling in the raw gas is less than 1ppm.This technology no matter be the raw gas that produces of semi-coking process or 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, do not produce waste water after washing is cooled off to raw gas yet, thereby thoroughly saved whole waste water treatment process, do not cause harm environment, and can also obtain the coal tar byproduct, remove coal tar technology with existing raw gas and compare, water saving, energy-conservation, reduce aspects such as investment and production cost extremely outstanding advantage arranged, be specially adapted to the high raw gas purifying of coal tar content.The strange gasifying process in Shandong with 950 tons/day of coal feeding amounts is an example, as adopt present technique to purify raw gas, owing to save oily water separation, 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 a process flow sheet of the present invention.
Wherein, 1-quenching column, 2-recycle pump, 3-water cooler, 4-electrical tar precipitator.
Embodiment
Embodiment: the raw gas that produces with the semi-coking process is an example, with reference to Fig. 1, the tar raw gas (about 361 ℃) that contains that the semi-coking process produces enters quenching column 1, with coal tar (the about 71 ℃) counter current contact of circulation from water 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, raw gas behind the preliminary decoking oil cooling 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; The coal tar that coal tar reaches from electrical tar precipitator after the quenching column 1 bottom wash heat exchange mixes (about 146 ℃) after recycle pump 2 is sent into water cooler 3, being recycled water coolant further cools off and (is cooled to about 71 ℃, described recirculated cooling water is from other operation of semi-coking), cooled coal tar is used to wash cooling and contains outside the consumption of coal tar crude coal gas guaranteeing to be circulated to quenching column 1, 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 quenching column 1 round-robin coal tar oil mass according to the tower raw gas variation of temperature control that goes out that records, and is higher than dew-point temperature to guarantee tower exit temperature; Detect liquid measure in the tower by liquidometer is set in the quenching column 1, thereby the coal tar oil mass of the redundance of coal tar basin is sent in control.Described water cooler 3 can adopt tube and shell heat exchanger.Described quenching column 1 can adopt packing tower.Described recycle pump 2 can adopt impeller pump.Coal tar during driving can use the coal tar of outsourcing earlier.
Claims (3)
- One kind contain coal tar crude coal gas remove tar technology, 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 contact of water 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 once more; Coal tar at the bottom of the quenching column is sent into quenching column again and is recycled after recycle pump is delivered to the water cooler cooling.
- 2. as claimed in claim 1 a kind of contain the tar raw gas remove tar technology, it is characterized in that, 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.
- 3. as claimed in claim 1 or 2 a kind of contain the tar raw gas remove tar technology, it is characterized in that the part of the coal tar behind the described water cooler internal cooling is also sent into the coal tar basin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910273320 CN101724472B (en) | 2009-12-18 | 2009-12-18 | Technology for removing tar from raw gas containing coal tar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910273320 CN101724472B (en) | 2009-12-18 | 2009-12-18 | Technology for removing tar from raw gas containing coal tar |
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| Publication Number | Publication Date |
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| CN101724472A true CN101724472A (en) | 2010-06-09 |
| CN101724472B CN101724472B (en) | 2013-03-13 |
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| CN 200910273320 Active CN101724472B (en) | 2009-12-18 | 2009-12-18 | Technology for removing tar from raw gas containing coal tar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102229806A (en) * | 2011-05-24 | 2011-11-02 | 金能科技有限责任公司 | 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 |
| CN103060016A (en) * | 2013-01-18 | 2013-04-24 | 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 |
| CN103509608A (en) * | 2012-06-19 | 2014-01-15 | 北京华泰焦化工程技术有限公司 | Raw gas cooling and fractionation method and coking apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1014718B (en) * | 1988-06-04 | 1991-11-13 | 河南省安阳钢铁公司 | Indirect two-stage primary cooling technology of coke-oven gas |
| CN101280226B (en) * | 2008-05-13 | 2011-02-16 | 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
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102229806A (en) * | 2011-05-24 | 2011-11-02 | 金能科技有限责任公司 | Green circular economy technology with coal coking as the main part |
| 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 |
| CN103509608A (en) * | 2012-06-19 | 2014-01-15 | 北京华泰焦化工程技术有限公司 | Raw gas cooling and fractionation method and coking apparatus |
| 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 |
| CN103060016A (en) * | 2013-01-18 | 2013-04-24 | 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 |
| 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 |
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|---|---|
| CN101724472B (en) | 2013-03-13 |
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