CN204281699U - The dedusting of a kind of pyrolysis raw gas and oil cooling reclaim the system of tar - Google Patents
The dedusting of a kind of pyrolysis raw gas and oil cooling reclaim the system of tar Download PDFInfo
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- CN204281699U CN204281699U CN201420724372.4U CN201420724372U CN204281699U CN 204281699 U CN204281699 U CN 204281699U CN 201420724372 U CN201420724372 U CN 201420724372U CN 204281699 U CN204281699 U CN 204281699U
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Abstract
The utility model discloses the system of the dedusting of a kind of pyrolysis raw gas and oil cooling recovery tar, comprise the dust removing units with raw gas entrance and gas exit, the gas exit of dust removing units connects the tower gas entry of tar refining tower, the tower gas exit of tar refining tower connects tar capture unit, tar capture unit offers the gas exit be sent to by coal gas out-of-bounds, and the top of tar refining tower is provided with tar mouth spray.The utility model arranges tar refining tower between dust removing units and tar capture unit, take full advantage of the heat of coal gas self, dewater refining by " principles of rectification " further by the tar collected, technical process is short, and gained tar water content is low, quality better.
Description
Technical field
The utility model belongs to chemical field, is specifically related to the system of the dedusting of a kind of pyrolysis raw gas and oil cooling recovery tar.
Background technology
China is the developing country of " oil starvation, weak breath, relative rich coal ", and in energy expenditure, the energy structure based on coal is China's important foundation of developing the economy and characteristic.Along with the increasingly deficient of petroleum and natural gas resource and people are to the inherent requirement of the utilising efficiency of resource and environmental protection, the form that utilizes of coal there occurs great change.Pyrolysis of coal technology is one of important channel of coal sub-prime high-efficiency cleaning trans-utilization, the product of clean gas, liquid, solid three kinds of different shapes can be produced by pyrolysis of coal, then sub-prime utilization is carried out to heterogeneity in coal, namely gas, liquid product use as chemical, and solid coal Jiaozhuo is the raw material of gasification further.The step sub-prime that pyrolysis of coal technology achieves coal utilizes, and has both improve comprehensive utilization ratio and the value-added content of product of coal resources, reduces again the coal-fired environmental pollution caused, has significant economic benefit, social benefit and environmental benefit.
It is extremely important link in pyrolytic process of coal that the dedusting of pyrolysis raw gas and tar reclaim.Current industrial pyrolyzing coal air cooling but reclaims the main technique adopting the direct rapid quench of a large amount of ammonia spray and electrically trapped tar oil to combine with tar, although pyrolyzing coal gas can be cooled to proper temperature by this technique, but this process has following significant shortcoming: first, produce a large amount of high-concentration organic substance wastewater in coal gas cooling and tar removal process, environmental pollution is serious; The second, in coal gas cooling and tar removal process, the entrained a large amount of sensible heat of pyrolysis coal gas is wasted, cannot the heat of this part of rationally high efficiente callback, and therefore the pyrolytic process of coal thermo-efficiency of employing ammonia spray direct rapid quench coal gas is lower.3rd, the tar obtained in the coal-tar middle oil recovery process of current pyrolysis industry is entrained with a large amount of pyrolysis water, and follow-up oily water separation difficulty is large, and tooling cost is high.Therefore, current domestic a lot of manufacturing enterprise and R&D institution are all actively improving or existing gas cleaning system of upgrading, and attempt to develop the system that a kind of high-efficient energy-saving environment friendly, the simple pyrolysis raw gas purification of technique and tar reclaim.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, there is provided the dedusting of a kind of pyrolysis raw gas and oil cooling to reclaim the system of tar, the problems such as system thermal efficiency in current low temperature pyrogenation raw gas purification process is low, recovery heat poor quality, recovery tar water content is high, tar recovery process is complicated can be solved.
In order to achieve the above object, the utility model comprises the dust removing units with raw gas entrance and gas exit, the gas exit of dust removing units connects the tower gas entry of tar refining tower, the tower gas exit of tar refining tower connects tar capture unit, tar capture unit offers the gas exit be sent to by coal gas out-of-bounds, and the top of tar refining tower is provided with tar mouth spray.
Described dust removing units comprises the grain bed fly-ash separator with raw gas entrance, and the gas exit of grain bed fly-ash separator connects the gas entry of electric dust-removing equipment, and electric dust-removing equipment gas exit connects the tower gas entry of tar refining tower.
Described grain bed fly-ash separator take coke granule as filtration medium, and top offers coke granule entrance, and bottom is provided with coke granule and cinder relief outlet.
Described tar capture unit comprises the coal gas cooling tower of the tower gas exit being connected tar refining tower by gas entry, the gas exit of coal gas cooling tower connects the gas entry of electrical tar precipitator, electrical tar precipitator offers the gas exit be sent to by coal gas out-of-bounds, and the top of coal gas cooling tower is provided with tar mouth spray.
Tar relief outlet is all offered bottom described coal gas cooling tower and electrical tar precipitator, and connect tar settling bowl, tar settling bowl is provided with tar outlet and pyrolysis water out, the tar outlet of tar settling bowl connects the tar entrance of tar groove, and the tar outlet of tar groove is connected with the circulation tar mouth spray of coal gas cooling tower with tar refining tower respectively through pipeline.
Described tar refining tower comprises tower body, and the bottom of tower body offers tower gas entry and tower tar outlet, and be provided with gas distribution column plate above tower gas entry in tower body, tower body top offers tower gas exit, and tower body top is provided with circulation tar shower nozzle.
Described coal gas cooling tower is the direct-cooled and cold shell and tube heat exchanger combined of coal gas, and comprise tube side and shell side, be provided with tar shower nozzle above tube side, shell side is provided with circulating cooling water entrance and is connected to air cooling circulating water device.
Compared with prior art, the utility model is ingenious between dust removing units and tar capture unit arranges tar refining tower, it makes full use of the sensible heat of pyrolysis coal gas, by " principles of rectification " except the moisture in tar removing, therefore, adopt the tar products moisture content that this device coal gas cools and tar reclaims, process for refining obtains extremely low, enormously simplify current gas tar purification and recover technique; This device from the sensible heat entrained by pyrolysis coal gas directly as the thermal source of moisture tar rectifying in tar refining tower, in same coke tar recovery system, achieve the efficiency utilization of heat, this device is the technique that the cooling of pyrolysis raw gas and coke tar recovery system provide a kind of brand-new heat recuperation; The filtrate of grain bed fly-ash separator adopts the high temperature coke particle of pyrolysis system self generation, and therefore filtrate is originated wide, with low cost and do not needed extra heating.
Further, the bipolar dedusting method that the utility model adopts grain bed dedusting and electrostatic precipitation to combine, efficiency of dust collection is up to more than 99%.
Further, coal gas cooling tower of the present utility model adopts the cold technique that combines between the direct-cooled and recirculated water of oil wash oil, good cooling results, and tar collection efficiency is high, and does not consume process water in technique, is efficient, water saving, environmental-protecting process.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the utility model tar refining tower;
Wherein, 1. grain bed fly-ash separator; 2. electric dust-removing equipment; 3. tar refining tower; 4. coal gas cooling tower; 5. air cooling circulating water device; 6. electrical tar precipitator; 7. blower fan; 8. tar settling bowl; 9. tar groove; 10. tar pump.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
See Fig. 1 and Fig. 2, the utility model a kind of pyrolysis raw gas dedusting and oil cooling reclaim the system of tar, comprise the dust removing units with raw gas entrance and gas exit, the gas exit of dust removing units connects the tower gas entry 3-2 of tar refining tower 3, the tower gas exit 3-3 of tar refining tower 3 connects tar capture unit, tar capture unit offers the gas exit be sent to by coal gas out-of-bounds, and the top of tar refining tower 3 is provided with tar mouth spray.
It is filtration medium with coke granule that dust removing units comprises the grain bed fly-ash separator 1 grain bed fly-ash separator 1 with raw gas entrance, top offers coke granule entrance, bottom is provided with coke granule and cinder relief outlet, the gas exit of grain bed fly-ash separator 1 connects the gas entry of electric dust-removing equipment 2, and electric dust-removing equipment 2 gas exit connects the tower gas entry 3-2 of tar refining tower 3, tar capture unit comprises the coal gas cooling tower 4 of the tower gas exit 3-3 being connected tar refining tower 3 by gas entry, the gas exit of coal gas cooling tower 4 connects the gas entry of electrical tar precipitator 6, electrical tar precipitator 6 offers the gas exit be sent to by coal gas out-of-bounds, the top of coal gas cooling tower 4 is provided with tar mouth spray, tar relief outlet is all offered bottom coal gas cooling tower 4 and electrical tar precipitator 6, and connect tar settling bowl 8, tar settling bowl 8 is provided with tar outlet and pyrolysis water out, the tar outlet of tar settling bowl 8 connects the tar entrance of tar groove 9, the tar outlet of tar groove 9 is connected with the circulation tar mouth spray of coal gas cooling tower 4 with tar refining tower 3 respectively through pipeline, coal gas cooling tower 4 is the direct-cooled and cold shell and tube heat exchanger combined of coal gas, comprise tube side and shell side, tar shower nozzle is provided with above tube side, shell side is provided with circulating cooling water entrance and is connected to air cooling circulating water device 5.
See Fig. 2, tar refining tower 3 comprises tower body 3-1, the bottom of tower body 3-1 offers tower gas entry 3-2 and tower tar outlet 3-5, gas distribution column plate 3-6 is provided with above tower gas entry 3-2 in tower body 3-1, tower body 3-1 top offers tower gas exit 3-3, and tower body 3-1 top is provided with circulation tar shower nozzle 3-4.
Method of work of the present utility model, comprises the following steps:
Step one: be 450 DEG C from pyrolysis oven raw gas temperature out, dustiness is 15.7g/m
3, tar content is 114.3g/m
3water vapour content is 17.9%, first coal gas enter grain bed fly-ash separator 1, this grain bed fly-ash separator take coke granule as filtration medium, and to remove the big dust particle be mingled with in pyrolysis coal gas, coke granule is from the high-temperature semi-coke particle of pyrolysis system product, consider pressure drop and the filtering accuracy of particle layers, particle layers temperature controls at 400-450 DEG C, and the size controlling of semicoke particle is within the scope of 12-20mm, and the efficiency of dust collection of this fly-ash separator is up to more than 87%;
Step 2: enter electric dust-removing equipment 2 from grain bed fly-ash separator 1 coal gas out, the working temperature of electric dust-removing equipment 2 is 400-450 DEG C, its major function is fine dust not removed in removing grain bed fly-ash separator 1, thus raising efficiency of dust collection, avoid fine dust to be mixed into tar products and reduce tar quality, the efficiency of dust collection of this fly-ash separator can up to more than 93%;
Step 3: then enter tar refining tower 3 from electric precipitator 2 coal gas out, bottom tar refining tower 3, working temperature is about 220-300 DEG C, head temperature is about 110-150 DEG C, the working temperature at bottom tar refining tower 3 and top is decided by pyrolysis coal gas and the temperature and flow of spraying solarization tar, after pyrolysis coal gas enters tar refining tower 3 from bottom, counter current contact heat exchange direct with the tar coming from tar groove 10, after heat exchange, tar temperature raises, carry secretly in tar liquid water be converted into the water vapour of gaseous form, discharge from tar refining tower 3 top with coal gas, tar is discharged by tar refining tower tar outlet 3-5 after being further dehydrated and refining, , after dehydration is refining, tar water content is 0.81%, meet industrial requirements.
Step 4: coal gas out enters coal gas cooling tower 4 from top from tar refining tower 3 top, coal gas cooling tower 4 is shell and tube heat exchanger, coal gas cooling tower 4 main body comprises tube side and shell side, tar shower nozzle is provided with above tube side, heating gas is cooled by the tar that top sprays in tube side, in coal gas, most of tar and pyrolysis water cooling are separated out, and in tube side, the heat of above-mentioned medium is removed in time by the recirculated cooling water in shell side again simultaneously, and the oil-water mixture of trapping is discharged bottom coal gas cooling tower 4.Temperature of exit gas controls at 40-50 DEG C, and recirculated water enters enclosed air cooling recirculated cooling water device 5, by air cooling by circulating water to about 25-30 DEG C;
Step 5: coal gas out enters electrical tar precipitator 6 from bottom bottom coal gas cooling tower 4, the working temperature of electrical tar precipitator 6 maintains about 40-60 DEG C, be mainly used in catching tar fog and water smoke that pyrolysis coal gas carries, improve the decontamination effect improving of pyrolysis coal gas, electrical tar precipitator 7 tar collection efficiency is up to more than 99%.From electrical tar precipitator 6 top, coal gas is out transported to out-of-bounds through blower fan 8.
Step 6: be provided with tar outlet bottom coal gas cooling tower 4 and electrical tar precipitator 6, the oil-water mixture of discharging from coal gas cooling tower 4 and the outlet of electrical tar precipitator 6 bottoms tar enters tar settling bowl 8, oil-water mixture in tar settling bowl 8 through initial gross separation, be divided into water layer and tar layer, water is discharged from the water out of tar settling bowl 8, and tar delivers to tar groove 9 through pipeline after tar settling bowl 8 tar relief outlet is discharged, tar in tar groove 9 sends into coal gas cooling tower 4 by tar pump 10 part, all the other send into tar refining tower 3, and dehydration is refining further, the coal-tar middle oil water content of above-mentioned tar groove 9 is 2.13%.Carry out sampling analysis to the burnt oil and gas after above-mentioned art breading terminates, the main character of coal-tar products is as shown in table 1 below.Adopt that total dust removal efficiency of this art breading pyrolysis coal gas is 99.09%, the tar rate of recovery reaches more than 98%, in tar, solid content is 0.93%, and water-content is 0.81%.It is high that this system has coal gas dust removal efficiency, tar quality better, heat recovery efficiency high.
The main character of table 1 coal-tar products
Claims (7)
1. pyrolysis raw gas dedusting and oil cooling reclaim the system of tar, it is characterized in that: comprise the dust removing units with raw gas entrance and gas exit, the gas exit of dust removing units connects the tower gas entry (3-2) of tar refining tower (3), the tower gas exit (3-3) of tar refining tower (3) connects tar capture unit, tar capture unit offers the gas exit be sent to by coal gas out-of-bounds, and the top of tar refining tower (3) is provided with tar mouth spray.
2. a kind of pyrolysis raw gas according to claim 1 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described dust removing units comprises the grain bed fly-ash separator (1) with raw gas entrance, the gas exit of grain bed fly-ash separator (1) connects the gas entry of electric dust-removing equipment (2), and electric dust-removing equipment (2) gas exit connects the tower gas entry (3-2) of tar refining tower (3).
3. a kind of pyrolysis raw gas according to claim 2 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described grain bed fly-ash separator (1) take coke granule as filtration medium, top offers coke granule entrance, and bottom is provided with coke granule and cinder relief outlet.
4. a kind of pyrolysis raw gas according to claim 1 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described tar capture unit comprises the coal gas cooling tower (4) of the tower gas exit (3-3) being connected tar refining tower (3) by gas entry, the gas exit of coal gas cooling tower (4) connects the gas entry of electrical tar precipitator (6), electrical tar precipitator (6) offers the gas exit be sent to by coal gas out-of-bounds, and the top of coal gas cooling tower (4) is provided with tar mouth spray.
5. a kind of pyrolysis raw gas according to claim 3 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described coal gas cooling tower (4) and electrical tar precipitator (6) bottom all offer tar relief outlet, and connect tar settling bowl (8), tar settling bowl (8) is provided with tar outlet and pyrolysis water out, the tar outlet of tar settling bowl (8) connects the tar entrance of tar groove (9), the tar outlet of tar groove (9) is connected with the tar mouth spray of tar refining tower (3) with coal gas cooling tower (4) respectively through pipeline.
6. a kind of pyrolysis raw gas according to claim 1 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described tar refining tower (3) comprises tower body (3-1), the bottom of tower body (3-1) offers tower gas entry (3-2) and tower tar outlet (3-5), interior tower gas entry (3-2) top of tower body (3-1) is provided with gas distribution column plate (3-6), tower body (3-1) top offers tower gas exit (3-3), and tower body (3-1) top is provided with circulation tar shower nozzle (3-4).
7. a kind of pyrolysis raw gas according to claim 1 dedusting and oil cooling reclaim the system of tar, it is characterized in that: described coal gas cooling tower (4) is the direct-cooled and cold shell and tube heat exchanger combined of coal gas, comprise tube side and shell side, be provided with tar shower nozzle above tube side, shell side is provided with circulating cooling water entrance and is connected to air cooling circulating water device (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106047423A (en) * | 2016-07-01 | 2016-10-26 | 朱绍辉 | Low-rank coal low-temperature pyrolysis tar gas recycling equipment |
| CN111534315A (en) * | 2020-03-06 | 2020-08-14 | 清华大学 | Rotary kiln low-rank coal pyrolysis cyclic upgrading process |
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2014
- 2014-11-26 CN CN201420724372.4U patent/CN204281699U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106047423A (en) * | 2016-07-01 | 2016-10-26 | 朱绍辉 | Low-rank coal low-temperature pyrolysis tar gas recycling equipment |
| CN111534315A (en) * | 2020-03-06 | 2020-08-14 | 清华大学 | Rotary kiln low-rank coal pyrolysis cyclic upgrading process |
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