CN203451475U - High-heating value gas heat carrier low-rank coal upgrading system - Google Patents
High-heating value gas heat carrier low-rank coal upgrading system Download PDFInfo
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- CN203451475U CN203451475U CN201320452337.7U CN201320452337U CN203451475U CN 203451475 U CN203451475 U CN 203451475U CN 201320452337 U CN201320452337 U CN 201320452337U CN 203451475 U CN203451475 U CN 203451475U
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Abstract
The utility model discloses a high-heating value gas heat carrier low-rank coal upgrading system, which is used for solving the problems of difficult direct burning utilization of lots of low-heating value pyrolysis gases and high operation cost of the existing high-heating value gas heat carrier low-rank coal upgrading system. The technical scheme of the high-heating value gas heat carrier low-rank coal upgrading system is as follows: the high-heating value gas heat carrier low-rank coal upgrading system comprises a drying furnace and a pyrolyzing furnace, the two of which are orderly connected with each other; the gas outlet of the pyrolyzing furnace is orderly connected to a pyrolytic cyclone dust collector, a chilling tower, an electrical tar precipitator and a pyrolytic circulating fan; the outlet of the pyrolytic circulating fan is connected with the fuel inlet and the pyrolysis gas inlet of a pyrolytic heating furnace; the pyrolysis gas outlet of the pyrolytic heating furnace is connected with the pyrolysis gas inlet of the pyrolyzing furnace. The system provided by the utility model is simple, high in operational reliability, low in cost and friendly to environment; and the generated pyrolysis gas is high in heating valve and can be reused by the system.
Description
Technical field
The utility model relates to a kind of low-rank coal upgrading system, specifically a kind of high heat value gas thermal barrier low-rank coal upgrading system.
Background technology
The research of low-rank coal upgrading technology starts from 20th century the eighties, and through the development of nearly 40 years, it is ripe that part low-rank coal upgrading technology has been tending towards, and be progressively applied in suitability for industrialized production.According to low-rank coal upgrading degree, divide, low-rank coal upgrading technology is mainly divided into dry (moulding) dehydration upgrading technology of Physical and pyrolysis (destructive distillation) the upgrading technology two large classes of chemical method both at home and abroad at present.
Low order improving quality of coal by pyrolysis technology ultimate principle is that low-rank coal is under isolated air (or at nonoxidizing atmosphere) condition, there is pyrolytic reaction and pyrogenic reaction in (350～800 ℃) at higher temperature, removing moisture and most of volatile and generating the process of coal gas, tar and semicoke.In pyrolysis upgrading process, there is the chemical transformation such as coking and thermolysis in low-rank coal coal body.This technology is different according to heating medium, is divided into gaseous heat-carrier pyrolytic technique and solid heat carrier pyrolysis technology.Gaseous heat-carrier pyrolytic technique is by being used hot gas low-rank coal coal to be carried out to pyrolysis for thermal source; Solid thermal carriers technology is to use hot solids to mix with brown coal as thermal source (high temperature semicoke or porcelain ball etc.), utilizes the sensible heat of solid thermal carriers brown coal to be heated to a kind of process for upgrading of pyrolysis.
The relative solid thermal carriers technique of gaseous heat-carrier pyrolytic process, operational condition relaxes easily control, and pyrolytic process oil offtake is large, the tar quality better obtaining.But because adopting high-temperature flue gas conventionally, traditional gaseous heat-carrier pyrolytic process directly contacts CO, H that pyrolysis of coal process produces with brown coal as thermal barrier
2diluted by a large amount of heated air with the combustibleconstituents such as hydro carbons, thereby the pyrolysis gas calorific value obtaining is very low, is generally about 300～500 kcal/Nm
3, this technological process exists a large amount of low heat value pyrolysis gas to be difficult to the problem that directly burning utilizes, and must a large amount of high heating value burning gas of blending (as Sweet natural gas) could burn, and greatly has influence on running cost.
Summary of the invention
The purpose of this utility model is in order to solve the problems of the technologies described above, and pyrolysis gas calorific value high heat value gas thermal barrier high and all native system reuses the low-rank coal upgrading system that a kind of technique is simple, serviceability is high, cost is low, produce is provided.
Described high heat value gas thermal barrier low-rank coal process for upgrading is: raw coal is entered to pyrolysis oven pyrolysis after sending into kiln dried, after having removed residual moisture and most of volatile, obtain semicoke and thick pyrolysis gas, described thick pyrolysis gas carries out dedusting, washing cooling, it is characterized in that, described dedusting, pyrolysis gas after washing cooling is divided at least two portions, first part's pyrolysis gas is sent into pyrolysis heater as fuel combustion, the high-temperature flue gas producing carries out indirect heating to sending into the second section pyrolysis gas of pyrolysis heater, pyrolysis gas after heating is delivered to the pyrolytic reaction that pyrolysis oven is dried raw coal thermal source is provided.
Described pyrolysis gas is divided into three parts, and wherein, third part pyrolysis gas is sent into dry Coalhotairfurnace fuel and coal dust mixed firing as a supplement, sends into dry raw coal in drying oven after the flue gas ash removal of generation.
Flue gas after institute's pyrolysis heater heat exchange is sent into dry Coalhotairfurnace and is mixed with described flue gas.
The dry cryodrying gas dedusting rear section producing of described raw coal is recycled to dry Coalhotairfurnace mixes with high-temperature flue gas, and rest part is arranged outward.
In cryodrying gas, the coal dust of isolated coal dust and separation in thick pyrolysis gas is sent into after merging after Pulverized Coal Bin is stored and is sent to dry Coalhotairfurnace as fuel.
The dedusting of the thick pyrolysis gas after described pyrolysis oven pyrolysis, washing cool-down method are: thick pyrolysis gas is first through tornado dust collector dedusting, then wash cooling through reverse contact of quenching column and coal tar, finally by the further decoking of electrical tar precipitator.
A kind of high heat value gas thermal barrier low-rank coal upgrading system for above-mentioned technique, comprise the drying oven and the pyrolysis oven that through pipeline, connect successively, the pneumatic outlet of described pyrolysis oven connects pyrolysis tornado dust collector, quenching column, electrical tar precipitator and pyrolysis recirculation blower successively, the outlet of described pyrolysis recirculation blower is connected with fuel inlet and the pyrolysis gas entrance of pyrolysis heater respectively, and the pyrolysis gas outlet of described pyrolysis heater is connected with the pyrolysis gas import of pyrolysis oven.
The outlet of described pyrolysis recirculation blower is also connected with the fuel inlet of dry Coalhotairfurnace, the exhanst gas outlet of described pyrolysis heater is connected with the smoke inlet of dry Coalhotairfurnace, and the exhanst gas outlet drying flue gas tornado dust collector of described dry Coalhotairfurnace are connected with the smoke inlet of drying oven.
The dry gas outlet drying sack cleaner of described drying oven, dry recycle blower fan are connected with the smoke inlet of dry Coalhotairfurnace.
The discharge of the discharge of described pyrolysis tornado dust collector and dry flue gas tornado dust collector is all connected with Pulverized Coal Bin entrance through screw feeder separately, and described Pulverized Coal Bin outlet is connected with the fuel inlet that is dried Coalhotairfurnace.
Described first part pyrolysis gas accounts for 5～20% of total pyro lysis temperature tolerance volume, and second section pyrolysis gas accounts for 60～95% of total pyro lysis temperature tolerance, and remainder is third part pyrolysis gas.
Technical process of the present utility model adopts the pyrolysis gas of high heating value, as pyrolysis thermal barrier, dried raw coal is carried out to pyrolysis, thereby can guarantee out that the pyrolysis gas calorific value of pyrolysis oven is higher, reaches 2000 Kcal/Nm
3above, thereby subsequent technique can directly utilize this gas, and without filling into again the fuel such as Sweet natural gas.The pyrolysis gas part cyclically utilizing of acquisition is carried out to pyrolysis to raw coal, part is sent into pyrolysis heater as fuel the pyrolysis gas of reuse is carried out to indirect heating, avoid flue gas to sneak in the pyrolysis gas of reuse, remaining part can also be sent into dry Coalhotairfurnace fuel generation high-temperature flue gas as a supplement, thereby realizes whole system self-energy self-equilibrating; In addition, the coal dust reclaiming in dust removal process also can be sent into dry Coalhotairfurnace as fuel combustion, and the energy producing in whole pyrolytic process is fully used, and need to, from external complement fuel, greatly not reduce the running cost of whole system completely.
Further, in quenching column, adopt coal tar to carry out dedusting, cooling and absorption to pyrolysis gas, utilize the similar principle that mixes to reclaim the coal tar component in pyrolysis gas, recycling electrical tar precipitator carries out secondary and catches Jiao, can be effectively by the coal tar recovering in pyrolysis gas, in the pyrolysis gas after processing, coal tar content is less than 1ppmv.And adopt coal tar as cooling, washing medium, and do not consume fresh water, to not producing waste water after pyrolysis gas wash cooling, do not cause environmental pollution yet, and can also obtain high-quality coal-tar products, be specially adapted to the purification of the pyrolysis gas that coal tar content is high.
The utility model system is simple, the system reform and running cost is low, capacity usage ratio is high, can realize whole system self-energy self-equilibrating, without outer for fuel, can produce the pyrolysis gas of high heating value (at 2000Kcal/Nm
3above), without waste water produce, waste gas generation is few, can significantly reduce the running cost, environmentally friendly of system.
Accompanying drawing explanation
Fig. 1 is the utility model process flow sheet and system diagram.
Wherein, 1-pyrolysis heater, 2-pyrolysis oven, 3-pyrolysis tornado dust collector, 4-quenching column, 5-PCT recycle pump, 6-PCT water cooler, 7-electrical tar precipitator, 8-pyrolysis recirculation blower, 9-dry Coalhotairfurnace, 10-drying oven, 11-dry sack cleaner, 12-dry recycle blower fan, 13-Quench dish, 14-screw feeder, 15-screw feeder, 16-dry flue gas tornado dust collector, 17-Pulverized Coal Bin.
Embodiment
System embodiment:
With reference to Fig. 1, drying oven 10, pyrolysis oven 2 and Quench dish 13 are connected successively, the pneumatic outlet of described pyrolysis oven 2 connects pyrolysis tornado dust collector 3, quenching column 4, electrical tar precipitator 7 and pyrolysis recirculation blower 8 successively, the outlet of described pyrolysis recirculation blower 8 is connected with the fuel inlet of pyrolysis heater 1 and the smoke inlet of pyrolysis gas entrance and dry Coalhotairfurnace respectively, and the pyrolysis gas outlet of described pyrolysis heater 1 is connected with the pyrolysis gas import of pyrolysis oven 2.
The exhanst gas outlet of described pyrolysis heater 1 is connected with the flue gas admission port of dry Coalhotairfurnace 9, and the exhanst gas outlet drying flue gas tornado dust collector 16 of described dry Coalhotairfurnace 9 are connected with the smoke inlet of drying oven 10.The dry gas outlet drying sack cleaner 11 of described drying oven 10, dry recycle blower fan 12 are connected with the smoke inlet of dry Coalhotairfurnace 9.
The discharge of the discharge of described pyrolysis tornado dust collector 3 and dry flue gas tornado dust collector 11 is all connected with Pulverized Coal Bin 17 entrances through screw feeder 14,15 separately, and described Pulverized Coal Bin 17 outlets are connected with the fuel inlet of dry Coalhotairfurnace 9.
The coal tar outlet of described quenching column 4 bottoms is connected with the coal tar import at quenching column 4 tops through PCT recycle pump 5, PCT water cooler 6.
Process example:
With reference to Fig. 1, flue gas drying to the water content that raw coal is sent into temperature in the interior quilt of drying oven 10 is weight percentage 20～40%, obtain cryodrying gas (temperature is 100～150 ℃) and dried raw coal, described dried then sending into carried out pyrolysis in pyrolysis oven 2, the semicoke obtaining and pyrolysis gas, described semicoke is transmitting system after the 13 Quench coolings of Quench dish; the pyrolysis gas obtaining (360～420 ℃) is sent into quenching column 4 after pyrolysis tornado dust collector 3 are isolated coal dust again, the reverse tar composition directly contacting in washing pyrolysis gas of coal tar (PCT) coming with tower top circulation in quenching column 4, in pyrolysis gas after dedusting washing cooling, coal tar content is less than 1ppmv, the pyrolysis gas temperature of controlling out quenching column 4 enters electrical tar precipitator 7 above at least 10 ℃ of its dew-point temperatures, after electrical tar precipitator 7 is processed pyrolysis gas in (coal tar content is less than 1ppmv, dustiness is less than 1ppmv) after carrying, pyrolysis recirculation blower 8 is divided into three parts, first part's (accounting for the volume percent 5～20% of pyrolysis gas total amount) pyrolysis gas is sent into pyrolysis heater 1 as fuel, the high-temperature flue gas producing carries out indirect heating to sending into the second section pyrolysis gas (accounting for the volume percent 60～95% of pyrolysis gas total amount) of pyrolysis heater 1, pyrolysis gas after heating (temperature is 550～600 ℃) is delivered to pyrolysis oven 2 and is directly contacted with dried raw coal as carrier gas, for the pyrolytic reaction of raw coal provides thermal source, third part pyrolysis gas (account for circulation gas total amount 0～20%) is sent into dry Coalhotairfurnace 9 fuel and coal dust mixed firing as a supplement, sends into and in drying oven 1, be dried raw coal in generation after flue gas (260～320 ℃) dedusting of temperature.Flue gas after the interior heat exchange of pyrolysis heater 1 is sent into dry Coalhotairfurnace 9.The cryodrying gas drying sack cleaner 11 that described moisture eliminator 10 is discharged is isolated after coal dust drying recirculation blower 12 parts again and is arranged (going desulphurization system) outward, part is recycled to dry Coalhotairfurnace 9, and described outer discharge capacity can be according to the dry required exhaust gas volumn properly distributed of raw coal.Described dry sack cleaner 11 and the isolated coal dust of dry sack cleaner 11 can be arranged (going pulverized coal forming system) outside part, and part is recycled to after Pulverized Coal Bin 17 is collected and sends into dry Coalhotairfurnace 9 for making fuel combustion generation flue gas.Described outer discharge capacity can be according to the required coal dust amount properly distributed of dry Coalhotairfurnace 9 burning.
Take that to produce the low-rank coal upgrading system of 1,000,000 tons per year be example, the pyrolysis gas calorific value obtaining after pyrolysis can reach 2000kcal/Nm
3, can save every year 1.2 ten thousand tons of gas consumptions, reclaim 50,000 tons, coal tar.
Claims (4)
1. a high heat value gas thermal barrier low-rank coal upgrading system, comprise the drying oven and the pyrolysis oven that through pipeline, connect successively, the pneumatic outlet of described pyrolysis oven connects pyrolysis tornado dust collector, quenching column, electrical tar precipitator and pyrolysis recirculation blower successively, it is characterized in that, the outlet of described pyrolysis recirculation blower is connected with fuel inlet and the pyrolysis gas entrance of pyrolysis heater respectively, and the pyrolysis gas outlet of described pyrolysis heater is connected with the pyrolysis gas import of pyrolysis oven.
2. high heat value gas thermal barrier low-rank coal upgrading system as claimed in claim 1, it is characterized in that, the outlet of described pyrolysis recirculation blower is also connected with the fuel inlet of dry Coalhotairfurnace, the exhanst gas outlet of described pyrolysis heater is connected with the smoke inlet of dry Coalhotairfurnace, and the exhanst gas outlet drying flue gas tornado dust collector of described dry Coalhotairfurnace are connected with the smoke inlet of drying oven.
3. high heat value gas thermal barrier low-rank coal upgrading system as claimed in claim 2, is characterized in that, the dry gas outlet drying sack cleaner of described drying oven, dry recycle blower fan are connected with the smoke inlet of dry Coalhotairfurnace.
4. the high heat value gas thermal barrier low-rank coal upgrading system as described in claim 1-3 any one, it is characterized in that, the discharge of the discharge of described pyrolysis tornado dust collector and dry flue gas tornado dust collector is all connected with Pulverized Coal Bin entrance through screw feeder separately, and described Pulverized Coal Bin outlet is connected with the fuel inlet that is dried Coalhotairfurnace.
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| CN201320452337.7U CN203451475U (en) | 2013-07-26 | 2013-07-26 | High-heating value gas heat carrier low-rank coal upgrading system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409152A (en) * | 2013-07-26 | 2013-11-27 | 中国五环工程有限公司 | Technology and system for upgrading low-rank coal through high-heating-value gas heat carrier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409152A (en) * | 2013-07-26 | 2013-11-27 | 中国五环工程有限公司 | Technology and system for upgrading low-rank coal through high-heating-value gas heat carrier |
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Granted publication date: 20140226 |