CN104342179B - Hybrid pyrolysis of coal method - Google Patents
Hybrid pyrolysis of coal method Download PDFInfo
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- CN104342179B CN104342179B CN201310331084.2A CN201310331084A CN104342179B CN 104342179 B CN104342179 B CN 104342179B CN 201310331084 A CN201310331084 A CN 201310331084A CN 104342179 B CN104342179 B CN 104342179B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B51/00—Destructive distillation of solid carbonaceous materials by combined direct and indirect heating
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Abstract
The invention discloses a kind of hybrid pyrolysis of coal method, it comprises the following steps：Feed coal enters in mixed pyrolysis stove, directly contacted with heating gas, pyrolytic reaction occurs for heat exchange, the raw coke oven gas of pyrolysis of coal generation enters in gas-liquid separator, obtain the coal tar and raw gas of high-quality, raw gas obtains clean coal gas after being purified through gas cleaning plant, most coal gas directly outer can be supplied, part coal gas is recycled in gas preheater, after the flue gas heat exchange of hot heat transmitter outlet outside mixed pyrolysis stove, obtain preheating gas, preheating gas are further raised into mixed pyrolysis stokehold to be entered in mixed pyrolysis stove after temperature, and bring the gaseous product that pyrolytic reaction is generated in gas-liquid separator into；Heat Jiao produced in mixed pyrolysis stove enters in CDQ device；The present invention can obtain the coal tar of high-quality by gas-liquid separation, and nitrogen content in coal gas after separation is low, reduce the scale and cost of the processing and utilization Facilities Construction device in coal gas later stage.
Description
Technical field
The present invention relates to a kind of pyrolysis of coal method, more particularly to a kind of hybrid pyrolysis of coal method.
Background technology
Low-temperature pyrolysis of coal can improve coal under mild conditions（Particularly low-order coal）Quality, low temperature pyrogenation technique press stove
The mode of heating of body can be divided into external-heat, internal heat type and inside and outside hybrid.The heating medium of external-heat stove is not contacted with feed coal,
Heat is pyrolyzed in the incoming heating furnace in furnace wall for raw material, thus almost without nitrogen, the product of pyrolysis gas in the coal pyrolysis gas obtained
Matter is preferable, but because its heat is incoming by furnace wall, its thermal efficiency is relatively low, and the investment cost of external-heat pyrolysis oven will be far above
Internal heat type pyrolysis oven.Internal heat type stove heats medium by it can be divided into solid thermal carriers and gas heat carrier.Enter by thermal source of gas
The internal heat type pyrolysis oven of row pyrolytic reaction, because feed coal is directly contacted with pyrolysis gas, heat exchange efficiency is higher, but due to heat source gas
In contain more nitrogen, the impurity contained in the pyrolysis gas obtained is more, unfavorable to following process.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of hybrid pyrolysis of coal method, and it can be obtained by gas-liquid separation
The coal tar of high-quality is obtained, nitrogen content in coal gas after separation is low, and the processing and utilization that the coal gas later stage can be greatly reduced is set
Apply the scale and cost of construction device.
The present invention is to solve above-mentioned technical problem by following technical proposals：A kind of hybrid pyrolysis of coal method, its
It is characterised by, it comprises the following steps：
Step one, feed coal enters in mixed pyrolysis stove, is directly contacted with heating gas, and pyrolytic reaction occurs for heat exchange, meanwhile,
The high-temperature flue gas or circulating flue gas that the heat that coal-char combustion is generated in combustion furnace can be generated by coal-char combustion exchange heat in combustion furnace
Heating is converted into high-temperature flue gas, brings into the outer hot heat transmitter in mixed pyrolysis stove, and feed coal and pyrolysis gas indirect heat exchange, more
Mend the heat that pyrolysis of coal process is lost；The raw coke oven gas of pyrolysis of coal generation enters in gas-liquid separator, obtains the coal tar of high-quality
Oil and raw gas, raw gas obtain clean coal gas after being purified through gas cleaning plant, most coal gas directly outer can be supplied, portion
Divide coal gas to be recycled in gas preheater, after the flue gas heat exchange of hot heat transmitter outlet outside mixed pyrolysis stove, obtain preheating gas,
Preheating gas are further raised into mixed pyrolysis stokehold to be entered in mixed pyrolysis stove after temperature, and the gas that pyrolytic reaction is generated
Body product is brought into gas-liquid separator；
The heat that is produced in step 2, mixed pyrolysis stove is burnt to be entered in CDQ device, by cold flue gas cooled after give
Enter in semicoke feed bin, semicoke obtains being burnt in cheap little particle fine powder Jiao, coke breeze feeding combustion furnace by screening, powder
The heat part of Jiao's burning is used for heating preheating gas；Remaining heat can be utilized using two ways, and one is by semicoke
The high warm flue gas and circulating flue gas of burning generation are mixed into high-temperature flue gas, and another made with indirect mode heat cycles flue gas
Be converted to high-temperature flue gas；High-temperature flue gas is subsequently fed into the outer hot heat transmitter of mixed pyrolysis stove and transfers heat to pyrolysis
Stove, cooling high-temperature fume is to middle temperature flue gas during this, and middle temperature flue gas continues cooling after gas preheater, is changed into cold smoke
Gas, cold flue gas is admitted to heating in CDQ device and is changed into circulating flue gas.
The positive effect of the present invention is：Coal gas and tar quality produced by the invention preferably, passes through gas-liquid separation
The coal tar of high-quality can be obtained, nitrogen content in coal gas after separation is low, the processing profit in coal gas later stage can be greatly reduced
With the scale and cost of Facilities Construction device, purified rear major part directly outer can be supplied, and part coal gas is recycled, circulating gas
Hot thermal source in mixed pyrolysis stove is used as after heated.
Brief description of the drawings
The theory diagram for the hardware that Fig. 1 uses for hybrid pyrolysis of coal method of the invention.
Embodiment
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, to describe technical scheme in detail.
The hybrid pyrolysis of coal method of the present invention comprises the following steps：
Step one, as shown in figure 1, feed coal（Granularity >=3mm）Into in mixed pyrolysis stove E-2, directly connect with heating gas
Touch, pyrolytic reaction occurs for heat exchange, meanwhile, the high temperature that the heat that coal-char combustion is generated in combustion furnace E-1 can be generated by coal-char combustion
Flue gas A1 or circulating flue gas the A4 heating that exchanged heat in combustion furnace E-1 are converted into high-temperature flue gas A1, bring into mixed pyrolysis stove E-2
In outer hot heat transmitter, with feed coal and pyrolysis gas indirect heat exchange, the heat that pyrolysis of coal process is lost is made up；Pyrolysis of coal generation
Raw coke oven gas enters in gas-liquid separator E-6, obtains the coal tar and raw gas of high-quality, raw gas is through gas cleaning plant E-7
Clean coal gas is obtained after purification, most coal gas directly outer can be supplied, and part coal gas is recycled in gas preheater E-5, with
Outside mixed pyrolysis stove E-2 after the flue gas heat exchange of hot heat transmitter outlet, preheating gas are obtained, preheating gas enter mixed pyrolysis stove E-
2, which take a step forward, enters in mixed pyrolysis stove E-2 after rise temperature, and the gaseous product that pyrolytic reaction is generated（Including gaseous state coal
Tar）Bring into gas-liquid separator E-6；
In the burnt E-3 into CDQ device of heat produced in step 2, mixed pyrolysis stove E-2, carried out by cold flue gas A3
Sent into after cooling in semicoke feed bin E-4, semicoke obtains cheap little particle fine powder Jiao, coke breeze feeding combustion furnace E-1 by screening
Middle to be burnt, the heat part of coke breeze burning is used for heating preheating gas；Remaining heat can carry out profit using two ways
With one is that the high warm flue gas and circulating flue gas A4 for generating coal-char combustion are mixed into high-temperature flue gas A1, and another is with indirect
Mode heat cycles flue gas A4 is allowed to be converted to high-temperature flue gas A1；High-temperature flue gas A1 is subsequently fed into the outer of mixed pyrolysis stove E-2
Pyrolysis oven is transferred heat in hot heat transmitter, high-temperature flue gas A1 is cooled to middle temperature flue gas A2, middle temperature flue gas A2 warps during this
Cross after gas preheater E-5 and continue to cool, be changed into cold flue gas A3, cold flue gas A3 is admitted to heating in CDQ device E-3 and turned
It is changed into circulating flue gas A4.In the cyclic process of flue gas, the cascade utilization of obvious heat of smoke is realized, improve flue gas utilizes effect
Rate.
So that feed coal input amount is 10t/h unit scale as an example, under certain operation temperature and pressure, feed coal
Physical property is as shown in table 1.The granularity of the small beans of raw material is more than 3mm.The overall material balance such as institute of table 2 of hybrid pyrolysis furnace apparatus
Show.As shown in table 3, as shown in Table 3, the nitrogen amount contained by the coal gas that this patent technique is obtained is very for the composition given gas outside
It is few, be conducive to coal gas following process and processing.Contained content of impurities is 2% in tar, is produced much smaller than gas heat carrier
The content of mechanical admixture and coke breeze in tar（Its value is about 5%）, with the content of impurities in external-heat pyrolytic tar（Its value
About）Quite.The quality of granule semicoke is also preferable.
The blended pyrolysis oven of heat smoke, gas preheater, CDQ, are recycled in combustion furnace, flue gas is in circulation
Meanwhile, the cascade utilization of gas energy is realized, the thermal efficiency of this process itself is improved.Combustion furnace burning raw material be
The cheap coke breeze produced in technical process, semicoke product fine particle after screening of the coke breeze from CDQ.Combustion chamber
Temperature can also be controlled by powder coke content and air capacity, be conducive to the regulation and control of device stability.The circulation of coal gas part is as mixed
The interior thermal source of box-like pyrolysis oven, heat transfer efficiency is higher, and pyrolysis efficiency is higher, does not have air or other gases logical in pyrolytic process
Enter, coal gas product qualities are good, tar quality is also preferable.The thermal source of mixed pyrolysis stove is by internal heat type thermal source and external-heat thermal source two
Be grouped into, the raw coke oven gas that internal heat type thermal source is generated by pyrolysis of coal through gas-liquid separation, purification, preheating and with coal-char combustion stove heat
Heating gas is converted into provide；High warm flue gas of the external-heat thermal source outside pyrolysis oven in hot heat transmitter is provided.
Those skilled in the art can carry out various remodeling and change to the present invention.Therefore, present invention covers fall into
Various remodeling and change in the range of appended claims and its equivalent.
Claims (1)
1. a kind of hybrid pyrolysis of coal method, it is characterised in that it comprises the following steps：
Step one, feed coal enters in mixed pyrolysis stove, is directly contacted with heating gas, and pyrolytic reaction occurs for heat exchange, meanwhile, burning
The high-temperature flue gas that can be generated by coal-char combustion of heat or circulating flue gas that coal-char combustion is generated in stove exchange heat heating in combustion furnace
High-temperature flue gas is converted into, brings into the outer hot heat transmitter in mixed pyrolysis stove, with feed coal and pyrolysis gas indirect heat exchange, makes up coal
The heat that pyrolytic process is lost；Pyrolysis of coal generation raw coke oven gas enter gas-liquid separator in, obtain high-quality coal tar and
Raw gas, raw gas obtains clean coal gas after being purified through gas cleaning plant, most coal gas directly outer can be supplied, part coal
Gas is recycled in gas preheater, after the flue gas heat exchange of hot heat transmitter outlet outside mixed pyrolysis stove, is obtained preheating gas, is preheated
Coal gas is further raised into mixed pyrolysis stokehold to be entered in mixed pyrolysis stove after temperature, and the gas that pyrolytic reaction is generated is produced
Thing is brought into gas-liquid separator；
The heat that is produced in step 2, mixed pyrolysis stove is burnt to be entered in CDQ device, by cold flue gas cooled after feeding partly
In burnt feed bin, semicoke obtains being burnt in cheap little particle fine powder Jiao, coke breeze feeding combustion furnace by screening, coke breeze combustion
The heat part of burning is used for heating preheating gas；Remaining heat can be utilized using two ways, and one is by coal-char combustion
The high warm flue gas and circulating flue gas of generation are mixed into high-temperature flue gas, and another is to be allowed to turn with indirect mode heat cycles flue gas
It is changed to high-temperature flue gas；High-temperature flue gas is subsequently fed into the outer hot heat transmitter of mixed pyrolysis stove and transfers heat to pyrolysis oven, this
During cooling high-temperature fume to middle temperature flue gas, middle temperature flue gas continue after gas preheater cooling, be changed into cold flue gas, cold smoke
Gas is admitted to heating in CDQ device and is changed into circulating flue gas；
The thermal source of mixed pyrolysis stove is made up of internal heat type thermal source and external-heat thermal source two parts, and internal heat type thermal source is given birth to by pyrolysis of coal
Into raw coke oven gas is through gas-liquid separation, purification, preheating and with coal-char combustion stove heat is converted into heating gas and provides；External-heat thermal source
High warm flue gas outside pyrolysis oven in hot heat transmitter is provided.
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| CN104531188B (en) * | 2015-01-13 | 2017-07-14 | 天华化工机械及自动化研究设计院有限公司 | A kind of pneumatic conveying drying, external-heat pyrolysis of coal method |
| CN105062528B (en) * | 2015-09-07 | 2017-09-29 | 浙江大学 | A kind of pyrolysis of coal multi-production process and its device suitable for coal-powder boiler |
| CN105331377A (en) * | 2015-11-16 | 2016-02-17 | 北京神雾环境能源科技集团股份有限公司 | Coal pyrolysis method and system |
| CN105670665B (en) * | 2016-03-29 | 2019-07-05 | 新疆广汇煤炭清洁炼化有限责任公司 | Pulverized coal pyrolysis device |
| CN105623689A (en) * | 2016-03-29 | 2016-06-01 | 新疆广汇中化能源技术开发有限公司 | Coal pyrolysis system |
| CN108085031A (en) * | 2017-12-29 | 2018-05-29 | 浙江百能科技有限公司 | The process and device of a kind of pyrolysis of coal high heating value gas and high heating value block coke |
| CN108559535B (en) * | 2017-12-29 | 2021-12-14 | 浙江百能科技有限公司 | Multi-stage heat exchange device for preparing high-calorific-value coal gas and high-calorific-value lump coke by coal pyrolysis |
| CN112852459A (en) * | 2020-12-24 | 2021-05-28 | 陕西煤业化工集团神木天元化工有限公司 | Pulverized coal pyrolysis device and pyrolysis method |
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| EP0584413A1 (en) * | 1991-04-05 | 1994-03-02 | Pasco Nominees Pty Ltd | Pyrolysis process |
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| CN101885973A (en) * | 2010-06-28 | 2010-11-17 | 周松涛 | Dry distillation production process for lignite or high volatile coal |
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| EP0584413A1 (en) * | 1991-04-05 | 1994-03-02 | Pasco Nominees Pty Ltd | Pyrolysis process |
| CN2229456Y (en) * | 1995-10-10 | 1996-06-19 | 季可达 | Vertical dry distillation furnace body adapted for continuous dry distillation to coal under low temperature |
| CN101787291A (en) * | 2009-12-28 | 2010-07-28 | 曲靖众一精细化工股份有限公司 | High-efficiency and quick lignite pyrolysis method |
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| CN102504848A (en) * | 2011-10-25 | 2012-06-20 | 长安大学 | Coal horizontal rotation dry distillation process and equipment |
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