CN107763967A - Low-rank coal drying system with steam compression circulation - Google Patents
Low-rank coal drying system with steam compression circulation Download PDFInfo
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- CN107763967A CN107763967A CN201711187585.2A CN201711187585A CN107763967A CN 107763967 A CN107763967 A CN 107763967A CN 201711187585 A CN201711187585 A CN 201711187585A CN 107763967 A CN107763967 A CN 107763967A
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- 239000003245 coal Substances 0.000 title claims abstract description 129
- 238000001035 drying Methods 0.000 title claims abstract description 109
- 230000006835 compression Effects 0.000 title claims abstract description 98
- 238000007906 compression Methods 0.000 title claims abstract description 98
- 238000005406 washing Methods 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 68
- 238000005201 scrubbing Methods 0.000 claims description 35
- 229910052757 nitrogen Inorganic materials 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 25
- 239000007921 spray Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 239000011555 saturated liquid Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000002309 gasification Methods 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003077 lignite Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Abstract
The invention provides a low-rank coal drying system with a steam compression cycle, which belongs to the technical field of coal gasification and is used for solving the problems of high energy consumption and large environmental pollution of the existing steam drying low-rank coal technology; the steam outlet of the low-rank coal drying device is connected with the input end of the dust remover, the steam output end of the dust remover is connected with the steam input end of the washing tower, the steam output end of the washing tower is connected with the inlet of the steam compressor, and the outlet of the steam compressor is connected with the low-rank coal drying device. The invention is particularly suitable for the drying process of low-rank coal, and has low energy consumption and good environmental protection.
Description
Technical field
The present invention relates to Coal Gasification Technology field, more particularly to a kind of low-order coal with steam compression cycle to dry system
System.
Background technology
China is big coal country of the world, and consumption of coal big country.For endowment of resources, China's primary energy has
The feature of " oil-poor, few gas, rich coal ".Coal resources in China proved reserves account for the 93.3% of China's fossil energy within 2010, wherein
Low-order coal especially lignite resource is particularly abundant, and according to statistics, 130,000,000,000 tons of lignite reserves has been verified in the whole nation, accounts for the whole nation
13% or so of coal gross reserves, it is current most reliable, the most cheap available energy for ensureing Chinese energy safety supply.But
Be due to lignite degree of coalification it is relatively low, it has the characteristics of high volatile, high-moisture, high ash content, low heat value, low ash smelting point,
It is difficult to be used directly.It is that its water content is higher to influence lignite at present using most important factor, before must to its processing and utilization
Processing must be dried.
Industrially the low-order coals such as lignite are dried typically using flue gas or steam as thermal source, but due to lignite
The features such as stability is poor, reactivity is high, it is very high using flue gas drying danger, often there are the accidents such as Fire explosion, so
This technique is also gradually eliminated.Current most of brown coal drying techniques all use the shape that indirect heat exchange is carried out using steam as thermal source
Formula.Although the vapor heat exchanger form that different process uses is different, make a general survey of these steam drying technologies, process program be mostly by
Waste hot steam directly empties or directly cooling recovery, and they could not solve the technologies such as high energy consumption, environmental pollution be big very well all the time
Difficult point.
The content of the invention
In order to solve the problems, such as that existing steam drying low-order coal technology high energy consumption, environmental pollution are big, the present invention provides a kind of
Low order coal drying system with steam compression cycle, can more comprehensive recovery system energy, not only increase drying efficiency,
And the water resource in coal has been reclaimed, energy consumption is low, and environmental pollution is small.
A kind of low order coal drying system with steam compression cycle provided by the invention, including low-order coal drying device,
Deduster, scrubbing tower and vapour compression machine；The steam (vapor) outlet of the low-order coal drying device connects the input of the deduster,
The steam output end of the deduster connects the steam input of the scrubbing tower, the steam output end connection institute of the scrubbing tower
The entrance of vapour compression machine is stated, the outlet of the vapour compression machine is connected with the low-order coal drying device.
In a kind of specific embodiment, the low-order coal drying device includes：
Raw coal preheater, for raw coal to be preheated；
Conveyer, feeding mouth are connected with the delivery outlet of the raw coal preheater, for conveying the original of raw coal preheater output
Coal；
Drying machine, feeding mouth are connected with the discharging opening of the conveyer, and heat exchange tube inlet enters with the vapour compression machine
Mouth connection, for the raw coal to be dried using the output steam of the vapour compression machine as thermal source；
Nitrogen preheater, for being preheated to input nitrogen；
Pneumatic conveying pump, feeding mouth are connected with the discharging opening of the drying machine and the discharging opening of the deduster, air intake
It is connected with the gas outlet of the nitrogen preheater, for using the inert gas that the nitrogen preheater provides as described in medium conveying
The dry coal of drying machine output.
In a kind of specific embodiment, the low order coal drying system with steam compression cycle also includes input port
The circulating pump being connected with the condensate outlet of the scrubbing tower, the spray liquid of the delivery outlet of the circulating pump and the scrubbing tower enter
Mouth connection.
In a kind of specific embodiment, the low order coal drying system with steam compression cycle also includes being used to incite somebody to action
The saturated liquid of the drying machine output carries out the knockout drum of gas-liquid separation；The input port connection institute of the knockout drum
The heat transfer tube outlet of drying machine, gas outlet connection drain valve are stated, liquid outlet connects the thermal source inlet of the raw coal preheater；It is described
Thermal source inlet of the thermal source outlet of raw coal preheater also with the nitrogen preheater is connected.
In a kind of specific embodiment, the condensate outlet of the nitrogen preheater also passes through pressure-reducing valve and the washing
The spray liquid entrance connection of tower.
In a kind of specific embodiment, the steam output end of the scrubbing tower connects the one-level pressure of the vapour compression machine
The entrance of contracting cylinder, the outlet of the one stage of compression cylinder are connected with the heat exchange tube inlet of drying machine top preheating section, described dry
The heat transfer tube outlet of dry machine top preheating section connects the entrance of the two-stage compression cylinder of the vapour compression machine, the two-stage compression cylinder
Outlet be connected with the heat exchange tube inlet of drying machine bottom dryer section, the entrance of the two-stage compression cylinder also with external steam
Entrance connects.
In a kind of specific embodiment, the steam output end of the one stage of compression cylinder is also connected to described by regulating valve
Dry the fluidized gas entrance of motor spindle.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
The steam generated in such scheme, during by low-order coal drying device moisture-free coal from coal carries out dedusting and washing, then
Compressed through vapour compression machine, low-order coal is dried the latent heat discharged using the steam condensation after compression, is not only increased
The efficiency of moisture-free coal, and the steam latent heat being evaporated from coal is effectively make use of, mass energy has been saved, has reached thing
Material, the energy distribute uses rationally, and system energy utilization ratio height, pollution is small, simple to operate, controllability is good, plant running is steady
It is fixed.Other condensate liquid can lean on pressure itself to enter scrubbing tower completely, and without setting increase pump again, moisture in coal is finally with liquid
Form is discharged, and realizes the recycling of water resource.Drying process of the system especially suitable for low-order coal, energy consumption are low, environmentally friendly
Property is good.
Brief description of the drawings
Fig. 1 is the structural representation of the low order coal drying system embodiment one provided by the invention with steam compression cycle
Figure；
Fig. 2 is the structural representation of the low order coal drying system embodiment two provided by the invention with steam compression cycle
Figure；
Fig. 3 is the structural representation of the low order coal drying system embodiment three provided by the invention with steam compression cycle
Figure；
Fig. 4 is the structural representation of the low order coal drying system example IV provided by the invention with steam compression cycle
Figure；
Fig. 5 is the structural representation of the low order coal drying system embodiment five provided by the invention with steam compression cycle
Figure；
Fig. 6 is the structural representation of the low order coal drying system embodiment six provided by the invention with steam compression cycle
Figure；
Fig. 7 is the structural representation of the low order coal drying system embodiment seven provided by the invention with steam compression cycle
Figure；
Fig. 8 is that the structure of the low order coal drying system most preferred embodiment provided by the invention with steam compression cycle is shown
It is intended to.
[description of reference numerals]
1st, raw coal preheater, 2, conveyer, 3, drying machine, 4, one stage of compression cylinder,
5th, two-stage compression cylinder, 6, regulating valve, 7, deduster, 8, scrubbing tower,
9th, circulating pump, 10, pressure-reducing valve, 11, drain valve, 12, Pneumatic conveying pump,
13rd, knockout drum, 14, nitrogen preheater, 15, low-order coal drying device, 16, vapour compression machine.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
Fig. 1 is the structural representation of the low order coal drying system embodiment one provided by the invention with steam compression cycle
Figure, as shown in fig. 1, the system includes low-order coal drying device 15, deduster 7, scrubbing tower 8 and vapour compression machine 16；Low order
The input of the steam (vapor) outlet connection deduster 7 of coal drying device 15, the steaming of the steam output end connection scrubbing tower 8 of deduster 7
Vapour input, the entrance of the steam output end connection vapour compression machine 16 of scrubbing tower 8, the outlet of vapour compression machine 16 and low-order coal
Drying device 15 connects.
In the present embodiment, the steam that deduster 7 is used to export low-order coal drying device 15 carries out gas solid separation, removes and steams
Solid particle in vapour, such as belt filter or ceramic filter etc. can be used.The steam of deduster output enters washing
Tower 8, scrubbing tower 8 wash input steam, the pact that will be evaporated followed by vapour compression machine 16 in coal in the saturated condition
0.13MPa saturated vapors, the reuse of 0.49MPa Posterior circles is compressed to low-order coal drying device 15, is discharged using steam condensation
Latent heat low-order coal is dried.The system uses the dedusting of deduster 7 and the dedusting series system of scrubbing tower 8, passes through the first order
After the dedusting of deduster 7, the solids content of waste hot steam is down to 10mg/Nm3, afterwards steam enter scrubbing tower 8 from bottom, with washing
The saturation water of the top of tower 8 spray inversely contacts, and further reduces the solids content in steam.Steam dust-laden after washing meets mark
Standard, vapour compression machine can be directly entered and be compressed.The system provided using the present embodiment, about 89% energy needed for drying brown coal
Steam of the source from recovery, the live steam of outside only offer about 11%, substantially reduces the overall energy consumption of system, greatly improved
The utilization ratio of system capacity.
Fig. 2 is the structural representation of the low order coal drying system embodiment two provided by the invention with steam compression cycle
Figure, as shown in Figure 2, on system shown in Figure 1 architecture basics, low-order coal drying device 15 includes the system：Raw coal preheater
1st, conveyer 2, drying machine 3, nitrogen preheater 14 and Pneumatic conveying pump 12；Wherein, raw coal preheater 1, for raw coal to be carried out
Preheating, such as roller preheater can be used；Conveyer 2, feeding mouth is connected with the delivery outlet of raw coal preheater 1, for conveying
The raw coal of raw coal preheater output；Drying machine 3, feeding mouth are connected with the discharging opening of conveyer 2, heat exchange tube inlet and both vapor compression
The outlet connection of machine 16, for raw coal to be dried as thermal source using the output steam of vapour compression machine 16；Nitrogen preheater 14,
For being preheated to input nitrogen；Pneumatic conveying pump 12, feeding mouth and the discharging opening of drying machine 3 and the discharging opening of deduster 7
Connection, air intake is connected with the gas outlet of nitrogen preheater 14, for the inert gas that is provided using nitrogen preheater 14 as medium
The dry coal that conveyer dryer 3 exports.
In the present embodiment two, raw coal preheater 1 is initially entered by the raw coal of primary breakup, in the Central Plains of raw coal preheater 1
Coal carries out indirect heat exchange with high temperature steam condensate, and the raw coal after preheating delivers to drying machine 3, drying machine 3 by conveying equipment
Using built-in steam pipe type indirect heat exchange form, the heat exchanger tube of the high-temperature steam input drying machine 3 after the compression of vapour compression machine 16
Interior, raw coal is exchanged heat in drying machine 3 with steam in heat exchanger tube, and temperature is further improved, and raw coal most of moisture is taken off
Remove.Raw coal after drying enters Pneumatic conveying pump 12, and deduster 7 is by the drying coal dust obtained after steam filtration from deduster bottom
Portion's discharging opening input Pneumatic conveying pump 12, fully reclaims the coal dust in waste gas, improves system mass output rate, preheated eventually through nitrogen
The hot nitrogen that device 14 provides blows the dry coal in Pneumatic conveying pump 12 to downstream units, the system to be made using the nitrogen after preheating
For pumped (conveying) medium, ensure that the security of system and also dry coal be also not in condensation situation.
Fig. 3 is the structural representation of the low order coal drying system embodiment three provided by the invention with steam compression cycle
Figure, as shown in Figure 3, for the system on system shown in Figure 2 architecture basics, the system also includes the cold of input port and scrubbing tower 8
The circulating pump 9 of condensate outlet connection, the delivery outlet of circulating pump 9 are connected with the spray liquid entrance of scrubbing tower 8.
In the present embodiment three, scrubbing tower 8 is by the way of saturation washing, and bottom is additionally provided with circulating pump 9, and circulating pump 9 is used for
The spray liquid circulation inside scrubbing tower 8 is realized, such as circulating pump 9 can be centrifugal pump, by the spray liquid of the bottom of scrubbing tower 8 again
Input to the top of scrubbing tower 8 is sprayed, cost-effective so as to realize the recycling of spray liquid.
Fig. 4 is the structural representation of the low order coal drying system example IV provided by the invention with steam compression cycle
Figure, as shown in Figure 4, on system shown in Figure 2 architecture basics, the system also includes being used for export drying machine 3 the system
Saturated liquid carries out the knockout drum 13 of gas-liquid separation；The heat exchanger tube of the input port connection drying machine 3 of knockout drum 13 goes out
Mouthful, the gas outlet connection drain valve 11 of knockout drum 13, the thermal source of the liquid outlet connection raw coal preheater 1 of knockout drum 13
Entrance；Thermal source inlet of the thermal source outlet of the raw coal preheater 1 also with the nitrogen preheater 14 is connected.
In the present embodiment four, the steam condensate temperature that drying machine 3 is discharged is about 148 DEG C, and this some vapor enters gas-liquid
Knockout drum 13 carries out gas-liquid separation, and on-condensible gas is discharged by drain valve 11 in knockout drum 13, and following condensate liquid is successively
Into in raw coal preheater 1 and nitrogen preheater 14, as preheating raw coal and the thermal source of nitrogen, returning for waste heat is further carried out
Receive.
Fig. 5 is the structural representation of the low order coal drying system embodiment five provided by the invention with steam compression cycle
Figure, as shown in Figure 5, the system is on system shown in Figure 2 architecture basics, and the condensate outlet of nitrogen preheater 14 is also by subtracting
Pressure valve 10 is connected with the spray liquid entrance of scrubbing tower 8.
In the present embodiment five, the condensate liquid that knockout drum 13 exports successively enters raw coal preheater 1 and nitrogen preheater
14 are exchanged heat, and condensate temperature drops to 115 DEG C after flowing through nitrogen preheater 14, and some discharge recovery, another part follows
Looped-back system is as spray moisturizing.The whole washing process of the system scrubbing tower 8 is saturation state, and saturated vapor will not condense phase
Become.The steam condensate that the saturation water of the top of scrubbing tower 8 spray is discharged from nitrogen preheater 14, will by one group of pressure-reducing valve 10
About 0.45MPa condensate liquid is down to 0.13MPa as cleaning solution, and condensate liquid can lean on pressure itself to enter scrubbing tower 8, nothing completely
Increase pump need to be again set, further increase system energy utilization rate.
Fig. 6 is the structural representation of the low order coal drying system embodiment six provided by the invention with steam compression cycle
Figure, as shown in Figure 6, for the system on system shown in Figure 2 architecture basics, vapour compression machine 16 is two-stage compressor, specific bag
Include one stage of compression cylinder 4, two-stage compression cylinder 5 and other additional components；The steam output end connection vapour compression machine 16 of scrubbing tower 8
The entrance of one stage of compression cylinder 4, the outlet of one stage of compression cylinder 4 are connected with the heat exchange tube inlet of the top preheating section of drying machine 3, drying machine
The entrance of the two-stage compression cylinder 5 of the heat transfer tube outlet connection vapour compression machine 16 of 3 top preheating sections, the outlet of two-stage compression cylinder 5
It is connected with the heat exchange tube inlet of the bottom dryer section of drying machine 3, the entrance of two-stage compression cylinder 5 is also connected with external steam entrance.
In the present embodiment six, system uses two-stage both vapor compression, and one stage of compression cylinder 4 is low pressure (LP) cylinder, and two-stage compression cylinder 5 is height
Cylinder pressure；Drying machine 3 is gas-solid formula indirect heat exchanger, is divided into top preheating section and bottom dryer section, steam walks tube side, and coal walks shell
Journey, for coal to be dried.Raw coal after broken initially enters raw coal preheater 1, is carried out with high temperature steam condensate
Heat exchange, subsequent pass through conveyer 2 and enter in drying machine 3.In the preheating section of drying machine 3, raw coal in heat exchanger tube with passing through one-level
Steam after compression cylinder 4 compresses is exchanged heat, and temperature is even further improved by applying coatings, and this section of steam does not condense.In drying machine 3
Dryer section, two-stage compression cylinder 5 compress after input heat exchanger tube in steam condense and discharge latent heat, raw coal most of moisture quilt
Removing.The present embodiment reaches cascade EDFA, two level pressure between compressor stage by introducing steam into the preheating section of drying machine and exchanging heat
The dryer section that the outlet vapor of contracting machine 5 enters drier 3 condenses as thermal source, steam after releasing heat, not only make use of steam
Sensible heat, compressor is also allowed to level off to the working condition of isotherm compression, hence it is evident that to improve mechanical compress efficiency.
Obviously, annexation shown in Fig. 6 can also be applied in Fig. 3 or Fig. 4 or system shown in Figure 5, and here is omitted.
Fig. 7 is the structural representation of the low order coal drying system embodiment seven provided by the invention with steam compression cycle
Figure, as shown in Figure 7, for the system on system shown in Figure 6 architecture basics, the steam output end of one stage of compression cylinder 4 also passes through tune
Section valve 6 is connected to the fluidized gas entrance of the bottom of drying machine 3.In the present embodiment, punished in compressor first order compression outlet pipeline
Go out all the way, the steam flow on pipeline is adjusted by a regulating valve 6, some vapor is introduced and dries motor spindle as drying machine
Fluidized gas, the coefficient of heat transfer of drying machine shell side is further increased, ensure that the drying effect of drying machine.
Fig. 8 is that the structure of the low order coal drying system most preferred embodiment provided by the invention with steam compression cycle is shown
It is intended to, as shown in Figure 8, the system includes：Raw coal preheater 1, conveyer 2, drying machine 3, one stage of compression cylinder 4, two-stage compression
Cylinder 5, regulating valve 6, deduster 7, scrubbing tower 8, circulating pump 9, pressure-reducing valve 10, drain valve 11, Pneumatic conveying pump 12, knockout drum
13rd, nitrogen preheater 14；Wherein, the annexation of system components is no longer superfluous herein as described in embodiment one to embodiment five
State.The operation principle of the low order coal drying system with steam compression cycle that the present embodiment provides is：
Raw coal after broken initially enters raw coal preheater 1, is exchanged heat with high temperature steam condensate, temperature is by normal
Temperature rises to 80 DEG C or so, subsequent passes through conveyer 2 and enters in drying machine 3, drying machine 3 divides to be done for top preheating section and bottom
Dry section, in preheating section, raw coal carries out heat-exchange temperature with steam in heat exchanger tube and is even further improved by applying coatings, and this section of steam do not occur it is cold
It is solidifying.Steam is condensed and discharges latent heat in dryer section, heat exchanger tube, and raw coal most of moisture is removed.Raw coal after drying
Into Pneumatic conveying pump 12, the nitrogen after being preheated by nitrogen preheater 14 is blowed to downstream units.On the other hand, from raw coal
The vapor being evaporated is initially entered in deduster 7, and solid content drops to 10mg/Nm after filtering3, Zhi Houcong
Bottom enters scrubbing tower 8, is inversely contacted with the saturation water of the top of scrubbing tower 8 spray, reduce further solids content.Scrubbing tower
8 by the way of saturation washing, and spray liquid comes from steam condensate, is down to saturation state by pressure-reducing valve 10, bottom is additionally provided with
Circulating pump 9.Steam by two-stage dedusting initially enters the one stage of compression cylinder 4 of vapour compression machine, passes through the compression of one stage impeller
Pressure is promoted to 0.28MPa by 0.13MPa, and temperature rises to 178 DEG C by 112 DEG C.For compressor, the effect of isotherm compression
Rate highest, cool so the steam after one stage of compression enters the preheating section of drying machine 3 while reclaim sensible heat, the steaming from preheating section outlet
Stripping temperature is down to 134 DEG C and enters the two-stage compression cylinder 5 of vapour compression machine, by compressor second level compressed steam boost in pressure
To 0.49MPa, afterwards into the dryer section of drying machine 3, discharge latent heat in dryer section steam and be condensed into 148 DEG C of saturated liquids,
Knockout drum 13 is subsequently entered, on-condensible gas is discharged by drain valve 11 in knockout drum 13, and following condensate liquid successively enters former
In coal preheater 1 and nitrogen preheater 14, as preheating raw coal and the thermal source of nitrogen, the recovery of waste heat is further carried out.Flow through
Condensate temperature drops to 115 DEG C after nitrogen preheater 14, and a part of circulating involuting system is as spray moisturizing, another part discharge
Recovery.
Drying system provided by the invention carries out dedusting and washing to caused steam in the low-order coal drying process such as lignite,
Recompress through vapour compression machine, be circulated back to afterwards in drying machine, as dry thermal source, reach material, the optimization of the energy is matched somebody with somebody
Use is put, pollution is reduced, improves yield, makes full use of heat, simultaneity factor is simple to operate, and controllability is good, and plant running is stable.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
- A kind of 1. low order coal drying system with steam compression cycle, it is characterised in that including low-order coal drying device (15), Deduster (7), scrubbing tower (8) and vapour compression machine (16)；Described in the steam (vapor) outlet connection of the low-order coal drying device (15) The input of deduster (7), the steam output end of the deduster (7) connects the steam input of the scrubbing tower (8), described The steam output end of scrubbing tower (8) connects the entrance of the vapour compression machine (16), the outlet of the vapour compression machine (16) with Low-order coal drying device (15) connection.
- 2. the low order coal drying system of steam compression cycle is carried as claimed in claim 1, it is characterised in that the low-order coal Drying device (15) includes：Raw coal preheater (1), for raw coal to be preheated；Conveyer (2), feeding mouth are connected with the delivery outlet of the raw coal preheater (1), for conveying the output of raw coal preheater Raw coal；Drying machine (3), feeding mouth are connected with the discharging opening of the conveyer (2), heat exchange tube inlet and the vapour compression machine (16) outlet connection, for the raw coal to be dried using the output steam of the vapour compression machine (16) as thermal source；Nitrogen preheater (14), for being preheated to input nitrogen；Pneumatic conveying pump (12), feeding mouth are connected with the discharging opening of the drying machine (3) and the discharging opening of the deduster (7), Air intake is connected with the gas outlet of the nitrogen preheater (14), for the inert gas provided with the nitrogen preheater (14) The dry coal of drying machine (3) output is conveyed for medium.
- 3. the low order coal drying system of steam compression cycle is carried as claimed in claim 2, it is characterised in that also include input The circulating pump (9) that mouth is connected with the condensate outlet of the scrubbing tower (8), delivery outlet and the washing of the circulating pump (9) The spray liquid entrance connection of tower (8).
- 4. the low order coal drying system of steam compression cycle is carried as claimed in claim 2, it is characterised in that also include being used for The saturated liquid of the drying machine (3) output is carried out to the knockout drum (13) of gas-liquid separation；The knockout drum (13) Input port connect the heat transfer tube outlet of the drying machine (3), gas outlet connection drain valve (11), liquid outlet connects the raw coal The thermal source inlet of preheater (1)；Thermal source of the thermal source outlet of the raw coal preheater (1) also with the nitrogen preheater (14) enters Mouth connection.
- 5. the low order coal drying system of steam compression cycle is carried as claimed in claim 4, it is characterised in that the nitrogen is pre- The condensate outlet of hot device (14) is also connected by pressure-reducing valve (10) with the spray liquid entrance of the scrubbing tower (8).
- 6. the low order coal drying system with steam compression cycle as described in any one of claim 2 to 5, it is characterised in that The steam output end of the scrubbing tower (8) connects the entrance of the one stage of compression cylinder (4) of the vapour compression machine (16), the one-level The outlet of compression cylinder (4) is connected with the heat exchange tube inlet of the drying machine (3) top preheating section, and drying machine (3) top is pre- The heat transfer tube outlet of hot arc connects the entrance of the two-stage compression cylinder (5) of the vapour compression machine (16), the two-stage compression cylinder (5) Outlet be connected with the heat exchange tube inlet of the drying machine (3) bottom dryer section, the entrance of the two-stage compression cylinder (5) also with outside Portion steam inlet connects.
- 7. the low order coal drying system of steam compression cycle is carried as claimed in claim 6, it is characterised in that the one-level pressure The steam output end of contracting cylinder (4) is also connected to the fluidized gas entrance of the drying machine (3) bottom by regulating valve (6).
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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