CN105255519A - Method for predrying, powdering and conveying feed coal and special processing system thereof - Google Patents
Method for predrying, powdering and conveying feed coal and special processing system thereof Download PDFInfo
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- CN105255519A CN105255519A CN201510640680.8A CN201510640680A CN105255519A CN 105255519 A CN105255519 A CN 105255519A CN 201510640680 A CN201510640680 A CN 201510640680A CN 105255519 A CN105255519 A CN 105255519A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses a method for predrying, powdering and conveying feed coal and a special processing system thereof. The method comprises the following steps that 1, coom in a predrying feeding bin is conveyed into a fluid bed drying oven to be predried, and the obtained predried coom enters a powdering feeding coal bunker; 2, the predried coom is fed into a coal pulverizer from the powdering feeding coal bunker to be pulverized to obtain pulverized coal to be fed into a pulverized coal bunker; 3, the pulverized coal is conveyed into a high-pressure pulverized coal tank through a solid pulverized coal conveying pump. The special processing system comprises the feeding bin, the fluid bed drying furnace, the powdering feeding coal bunker, the coal pulverizer, the pulverized coal bunker, the solid pulverized coal conveying pump and the high-pressure pulverized coal tank which are connected in sequence. The feed coal drying effect is good, and energy is saved; the coal pulverizing and drying operation is safer, the pulverized coal conveying energy consumption is small, and efficiency is high.
Description
Technical field
The present invention relates to that a kind of feed coal is predrying, the method for powder process and conveying and dedicated processes system thereof, belong to coal chemical technology.
Background technology
The powdered coal pressuring gasified technology of air flow bed is one of current advanced Coal Gasification Technology, have that coal adaptability is wide, raw material consumption is low, efficiency of carbon conversion is high, cold gas efficiency is high, equipment life is long, be easy to the technical superioritys such as maximization, the fuel gas that synthetic gas can be used as the unstripped gas of coal direct liquefaction and indirect liquefaction process, IGCC generates electricity of preparation, can also for the production of synthetic ammonia, methyl alcohol, dme etc.For the feed coal that water content is lower, feed coal preprocessing process conventional at present mainly comprises raw coal fragmentation, mill coal drying, fine coal positive delivery, and feed coal is carried out drying by grinding machine while coal-grinding, reaches the moisture requirement of vapourizing furnace import.For the brown coal that water content is higher, pre-drying process process can be increased before coal-grinding.And the whizzer of current traditional brown coal pre-drying process major part employing flue gas and coal direct contact type and pneumatic drier etc., exist unit load little, invest the shortcomings such as high, floor space is large, simultaneously brown coal directly contact with high-temperature flue gas and easily produce blast.
Tradition pressurization of dry pulverized coal Dense Phase Pneumatic Conveying System adopts the mode of high pressure gas displacement that dry pulverized coal is transported to hyperbaric environment from atmospheric pressure environment, and high pressure substitution gas generally adopts nitrogen or carbonic acid gas.Tradition pulverized coal conveying device not only complex structure, power consumption, air consumption are very large, and in the synthetic gas going out vapourizing furnace nitrogen or carbon dioxide content higher.This is comparatively large on the impact of the process efficiency such as downstream methanol, coal liquifaction, weakens dried coal powder to a certain extent and gasify the advantage of the oxygen consumption brought and coal consumption reduction.
In sum, there is many deficiencies in current powdered coal pressuring gasified technology Raw Coal pretreatment and fine coal course of conveying, therefore needs to research and develop a kind of feed coal pre-treatment and transporting integration process being more suitable for the powdered coal pressuring gasified technology of air flow bed.
Summary of the invention
The object of this invention is to provide that a kind of feed coal is predrying, the method for powder process and conveying and dedicated processes system thereof; The present invention is good to feed coal drying effect, save energy; Safer to mill coal drying operation; To the conveying of fine coal power consumption less, efficiency is high.
Feed coal provided by the invention is predrying, the method for powder process and conveying, comprises the steps: 1) broken coal in predrying feeding warehouse is transported in fluidised bed drying stove predrying, obtain predrying after broken coal enter powder process charging coal bunker;
Described fluidised bed drying stove comprises fluid bed drying oven cavity, a feed valve, a bleeder valve, heating tube and interconnective two groups of gas distributors; Described feed valve and described bleeder valve are located at top and the bottom of described fluidised bed drying furnace cavity respectively; Described fluidised bed drying furnace chamber body wall top is provided with a cyclic steam outlet, and described fluidised bed drying furnace chamber body wall arranges 2 cyclic steam entrances in described gas distributor place; Described heating tube comprises epimere heating tube and hypomere heating tube, and described epimere heating tube and described hypomere heating tube are divided into the upper and lower in described fluidised bed drying furnace cavity; Described epimere heating tube is provided with heating steam inlet I and vapor condenses water out I, and described hypomere heating tube is provided with heating steam inlet II and vapor condenses water out II; Described gas distributor is located in described fluidised bed drying furnace cavity, and described two groups of gas distributors are all connected with described cyclic steam entrance, and is located between described epimere heating tube and described hypomere heating tube; The upper, middle and lower of described fluidised bed drying stove is respectively equipped with multiple mirror mouth;
2) described predrying after broken coal sent in coal pulverizer by described powder process charging coal bunker and grind, the coal dust obtained sends into Pulverized Coal Bin;
3) described coal dust is delivered in high-pressure powdered coal tank through solid fine coal transferpump by described Pulverized Coal Bin, and then is delivered to pressurized-gasification furnace burner through nitrogen or carbonic acid gas;
Described solid fine coal transferpump comprises a conveyor piston, a piston cylinder, a drive unit, a transfer line, a pressure-balanced valve and a vent valve; Described piston cylinder comprises driving cylinder and fine coal cylinder, and described conveyor piston is slidably arranged in described piston cylinder, and described conveyor piston has the through hole of the described fine coal cylinder of a connection; The discharge end of described fine coal cylinder is provided with a blow-off valve, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described blow-off valve; Described drive unit is fixedly installed on described driving cylinder, for driving described conveyor piston linear reciprocating motion in described piston cylinder; The feed end of described transfer line connects described Pulverized Coal Bin, and discharge end is connected with described fine coal cylinder by described through hole; Described pressure-balanced valve and described vent valve are arranged on the discharge end place of described fine coal cylinder, and are positioned at described blow-off valve front end, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described pressure-balanced valve, is connected with atmospheric pressure environment by described vent valve.
In the present invention, the described epimere heating tube that described fluidised bed drying furnace interior is arranged and described hypomere heating tube are respectively ebullated bed and moving-bed, and in ebullated bed, pulverized coal particle is in the state of strenuous exercise, can increase drying effect; Moving-bed can remove the water in coal dust further, can select the moving-bed of opening or closing hypomere heat transfer tube according to the water content of feed coal; After described dry Posterior circle steam goes out fluidised bed drying stove, enter cleaning apparatus and carry out gas solid separation, isolated coal dust sends into powder process charging coal bunker, and an isolated superheated vapour part goes water reclamation system in coal, another part removes centrifugal blower, sends into drying oven recycle by centrifugal blower;
The lower steam of described predrying employing energy level as the medium of heating, to reach the effect of environmental protection and energy saving.
In above-mentioned method, the particle diameter≤6mm of described broken coal, the water content of described broken coal is 20 ~ 65%, specifically can be 28%;
Described broken coal is heated by heating tube described in described fluidised bed drying stove;
The temperature of the steam in described heating tube can be 159 ~ 220 DEG C, specifically can be 175 DEG C;
The pressure of the steam in described heating tube can be 0.5 ~ 1.0MPaG, specifically can be 0.8MPaG;
Described predrying after the water content of broken coal can be 2 ~ 12%;
The predrying residence time of described broken coal can be 30 ~ 90min.
In above-mentioned method, described predrying after the inert atmosphere of broken coal in described coal pulverizer in grind; Coal dust after grinding and noble gas mixtures are admitted to cleaning apparatus and carry out gas solid separation, isolated coal dust sends into described Pulverized Coal Bin, isolate the gas after coal dust (weary gas) to be taken away by exhaust blower, major part enters inert gas generator outlet line and recycles, and excessive gas is emptying;
Pressure in described coal pulverizer can be-600 ~-100Pa, specifically can be-150pa;
Temperature in described coal pulverizer can be 10 ~ 30 DEG C, specifically can be 25 DEG C;
When described predrying after the water content of broken coal be 3 ~ 12% time, step 2) in also comprise by described predrying after the step of broken coal drying.
In above-mentioned method, described predrying after broken coal adopt heat smoke dry;
The temperature of described heat smoke can be 150 ~ 300 DEG C, specifically can be 240 DEG C.
In above-mentioned method, described inert atmosphere is nitrogen or carbonic acid gas;
In described inert atmosphere, the content of oxygen is not higher than 8mol%, controls oxygen level, and the process making it to produce is safer;
Described heat smoke is produced after the high-temperature flue gas that fuel gas burning produces mixes with the described noble gas atmosphere of circulation by inert gas generator;
Described fuel gas burning required air is provided by gas blower.
In above-mentioned method, the content that the particle diameter of described coal dust can be 5 ~ 90 μm accounts for more than 80%, and what specifically can be particle diameter≤90 μm of described coal dust accounts for 90%, granularity≤5 μm account for 10%;
Described coal dust can be 3 ~ 5MpaG through the pressure of described solid fine coal transferpump conveying pressurization, specifically can be 5.0MpaG.
In above-mentioned method, described fluidised bed drying stove is a square cavity;
Described transfer line comprises an outer hopper be connected with described dried coal powder feedway by an outer feed valve, many outer feeding bent pipes, many charging expansion pipes, many interior feeding bent pipes and are arranged on described conveyor piston and hopper in being connected with described through hole by feed valve in, described outer feed valve is for controlling the opening and closing of described outer hopper, and described interior feed valve is for controlling the opening and closing of described interior hopper; Charging expansion pipe described in each comprises the interior pipe be fixed on described drive unit outer wall and the outer tube that can slide relative to described interior pipe, the interior pipe of described charging expansion pipe is connected with described outer hopper respectively by feeding bent pipe outer described in, it is outside that the interior Guan Jun of described outer hopper, outer feeding bent pipe and charging expansion pipe is positioned at described driving cylinder, forms described transfer line and be positioned at part outside described piston cylinder; The outer tube of described charging expansion pipe is connected with described interior hopper respectively by feeding bent pipe interior described in, the outer tube of described charging expansion pipe, interior feeding bent pipe and interior hopper are all positioned at described driving cylinder, form the part that described transfer line is positioned at described piston cylinder.
In above-mentioned method, described solid fine coal transferpump also comprises a ball head connecting piece, an anti-rotary column;
Described ball head connecting piece one end is connected with described drive unit, and the other end is fixedly connected with described conveyor piston by many pillar stiffeners; The space being positioned at described piston cylinder part for holding described transfer line is formed between described conveyor piston and described ball head connecting piece; The outer tube of described charging expansion pipe is fixedly installed on described ball head connecting piece, and described drive unit drives described ball head connecting piece to move, thus drive described conveyor piston and transfer line be positioned at described piston cylinder part together with move;
Described anti-rotary column is arranged on described ball head connecting piece through described driving cylinder top;
Between described conveyor piston and described piston cylinder inwall, between the inner and outer pipe of described charging expansion pipe, Y type wear ring is adopted to seal; The described piston cylinder inwall that described conveyor piston passes through is continuous sealing face;
Described piston cylinder is also provided with bracing or strutting arrangement, for supporting described dried coal powder e Foerderanlage.
Present invention also offers that a kind of feed coal is predrying, the dedicated processes system of the method for powder process and conveying, it comprises the predrying feeding warehouse be connected successively, described fluidised bed drying stove, described powder process charging coal bunker, described coal pulverizer, described Pulverized Coal Bin, described solid fine coal transferpump and described high-pressure powdered coal tank;
The outlet of described predrying feeding warehouse is connected by the opening for feed of described worm conveyor with described fluidised bed drying stove; The discharge port of described fluidised bed drying stove is connected by the entrance of predrying chapelet with described powder process charging coal bunker, the outlet of described powder process charging coal bunker is connected by the entrance of feeding machine with described coal pulverizer, and the outlet of described coal pulverizer is connected by the entrance of powder process chapelet with described Pulverized Coal Bin;
Described fluidised bed drying stove comprises fluid bed drying oven cavity, a feed valve, a bleeder valve, heating tube and interconnective two groups of gas distributors; Described feed valve and described bleeder valve are located at top and the bottom of described fluidised bed drying furnace cavity respectively; Described fluidised bed drying furnace chamber body wall top is provided with a cyclic steam outlet, and described fluidised bed drying furnace chamber body wall arranges 2 cyclic steam entrances in described gas distributor place; Described heating tube comprises epimere heating tube and hypomere heating tube, and described epimere heating tube and described hypomere heating tube are divided into the upper and lower in described fluidised bed drying furnace cavity; Described epimere heating tube is provided with heating steam inlet I and vapor condenses water out I, and described hypomere heating tube is provided with heating steam inlet II and vapor condenses water out II; Described gas distributor is located in described fluidised bed drying furnace cavity, and described two groups of gas distributors are all connected with described cyclic steam entrance, and is located between described epimere heating tube and described hypomere heating tube; The upper, middle and lower of described fluidised bed drying stove is respectively equipped with multiple mirror mouth;
Described solid fine coal transferpump comprises a conveyor piston, a piston cylinder, a drive unit, a transfer line, a pressure-balanced valve and a vent valve; Described piston cylinder comprises driving cylinder and fine coal cylinder, and described conveyor piston is slidably arranged in described piston cylinder, and described conveyor piston has the through hole of the described fine coal cylinder of a connection; The discharge end of described fine coal cylinder is provided with a blow-off valve, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described blow-off valve; Described drive unit is fixedly installed on described driving cylinder; The feed end of described transfer line connects described Pulverized Coal Bin, and discharge end is connected with described fine coal cylinder by described through hole; Described pressure-balanced valve and described vent valve are arranged on the discharge end place of described fine coal cylinder, and are positioned at described blow-off valve front end, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described pressure-balanced valve, is connected with atmospheric pressure environment by described vent valve.
In above-mentioned treatment system, the described cyclic steam outlet of described fluidised bed drying stove is connected tornado dust collector, predrying sack cleaner and centrifugal blower successively with between described cyclic steam entrance; The dust outlet of described tornado dust collector is all connected with the pipeline of the discharge port of described fluidised bed drying stove with the dust outlet of described predrying sack cleaner;
Described fluidised bed drying stove is a square cavity;
Described transfer line comprises an outer hopper be connected with described dried coal powder feedway by an outer feed valve, many outer feeding bent pipes, many charging expansion pipes, many interior feeding bent pipes and are arranged on described conveyor piston and hopper in being connected with described through hole by feed valve in, described outer feed valve is for controlling the opening and closing of described outer hopper, and described interior feed valve is for controlling the opening and closing of described interior hopper; Charging expansion pipe described in each comprises the interior pipe be fixed on described drive unit outer wall and the outer tube that can slide relative to described interior pipe, the interior pipe of described charging expansion pipe is connected with described outer hopper respectively by feeding bent pipe outer described in, it is outside that the interior Guan Jun of described outer hopper, outer feeding bent pipe and charging expansion pipe is positioned at described driving cylinder, forms described transfer line and be positioned at part outside described piston cylinder; The outer tube of described charging expansion pipe is connected with described interior hopper respectively by feeding bent pipe interior described in, the outer tube of described charging expansion pipe, interior feeding bent pipe and interior hopper are all positioned at described driving cylinder, form the part that described transfer line is positioned at described piston cylinder.
In above-mentioned processing device system, described coal pulverizer is also connected with fuel gas hot-blast stove, described fuel gas hot-blast stove is also connected with gas blower;
Also be connected with powder process sack cleaner between described coal pulverizer and described powder process chapelet, on the pipeline between described coal pulverizer and described fuel gas hot-blast stove and between described powder process sack cleaner, be also connected with Vertical Mill exhaust blower;
When the present invention uses, the pipeline between described fuel gas hot-blast stove with described Vertical Mill exhaust blower is also connected with low-pressure nitrogen;
Described solid fine coal transferpump also comprises a ball head connecting piece, an anti-rotary column;
Described ball head connecting piece one end is connected with described drive unit, and the other end is fixedly connected with described conveyor piston by many pillar stiffeners; The space being positioned at described piston cylinder part for holding described transfer line is formed between described conveyor piston and described ball head connecting piece; The outer tube of described charging expansion pipe is fixedly installed on described ball head connecting piece, and described drive unit drives described ball head connecting piece to move, thus drive described conveyor piston and transfer line be positioned at described piston cylinder part together with move;
Described anti-rotary column is arranged on described ball head connecting piece through described driving cylinder top;
Between described conveyor piston and described piston cylinder inwall, between the inner and outer pipe of described charging expansion pipe, Y type wear ring is adopted to seal; The described piston cylinder inwall that described conveyor piston passes through is continuous sealing face;
Described piston cylinder is also provided with bracing or strutting arrangement, for supporting described dried coal powder e Foerderanlage.
The present invention has the following advantages:
1, the steam that pre-drying process employing energy level is lower, as heating medium, has obvious environmental protection and energy saving advantage.
2, in fluidised bed drying stove, heating tube, gas distributor, moving-bed and ebullated bed combine, this technique coal is applied widely, all applicable to moisture lower bituminous coal, hard coal from moisture higher brown coal, according to the difference that drying requires, water content can be down to 2 ~ 12%.
3, dehumidification system runs and is in superheated vapour state, and be an anaerobic drying process, do not have the danger of coal dust firing and blast, safe and reliable, recycled with the state caterpillar of superheated vapour by the moisture deviate from coal, thermo-efficiency is high, saving water resource.
4, the disposable moisture being dried to needs of raw coal, and without dead angle in drying oven, reach dry uniform moisture, the requirement of product discharge continuous print, the moisture in raw coal dehydration process and calorific value can carry out Reasonable adjustment as required.
5, the interior water removed in coal belongs to deep dehydration, needs the longer residence time, according to the requirement of project to whole moisture, can the height of mobile bed bottom reasonable adjusting drying oven, and reach the satisfactory product of water content.
6, fine coal solid pump structure is simple, and can greatly reduce the energy in fine coal course of conveying and the consumption of conveying gas, course of conveying efficiency is high, energy-conserving and environment-protective, and device can realize automatically running continuously, and can meet the demand of large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is that feed coal of the present invention is predrying, the dedicated processes system diagram of the method for powder process and conveying.
Fig. 2 is the structural representation of fluidised bed drying stove in Fig. 1 of the present invention.
Fig. 3 is the structural representation of gas distributor in Fig. 1 of the present invention.
Fig. 4 is the structural representation of solid fine coal transferpump in Fig. 1 of the present invention.
Fig. 5 and Fig. 6 is Local map in Fig. 4.
In Fig. 1, mark is as follows:
1 predrying feeding warehouse, 2 worm conveyors, 3 fluidised bed drying stoves, 4 tornado dust collector, 5 predrying sack cleaners, 6 centrifugal blowers, 7 predrying chapelets, 8 powder process charging coal bunkers, 9 hermetically sealed belt feeders, 10 gas blowers, 11 fuel gas hot-blast stoves, 12 vertical spindle coal pulverisers, 13 powder process sack cleaners, 14 Vertical Mill exhaust blowers, 15 powder process chapelets, 16 Pulverized Coal Bin, 17 solid fine coal transferpumps, 18 high pressure coal dust pots.
In Fig. 2 and 3, mark is as follows:
N1 feed valve, N2 cyclic steam exports, N3, N4 cyclic steam entrance, N5 bleeder valve, N6 heating steam inlet I, N7 vapor condenses water out I, N8 heating steam inlet II, N9 vapor condenses water out II, N10 gas distributor, S1-S6 mirror mouth.
In Fig. 4-6, mark is as follows:
171 conveyor pistons; 1711 through holes; 172 piston cylinders; 1721 driving cylinders; 1722 fine coal cylinders; 1723 blow-off valves; 173 drive units; 174 transfer lines; 1741 outer hoppers; 1742 outer feeding bent pipes; 1743 charging expansion pipes; Feeding bent pipe in 1744; Hopper in 1745; 1746 outer feed valves; Feed valve in 1747; 175 pressure-balanced valves; 176 vent valves; 177 ball head connecting pieces; 1771 pillar stiffeners; 1772 anti-rotary columns; 178Y type wear ring; 179 bracing or strutting arrangements.
Embodiment
The experimental technique used in following embodiment if no special instructions, is ordinary method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
Embodiment 1, feed coal are predrying, the method for powder process and conveying and special treatment system thereof
One, the special treatment system of the method for predrying, the powder process of feed coal and conveying
Be illustrated in figure 1 that feed coal of the present invention is predrying, the dedicated processes system of the method for powder process and conveying, comprise the predrying feeding warehouse 1, fluidised bed drying stove 3, powder process charging coal bunker 8, vertical spindle coal pulveriser 12, Pulverized Coal Bin 16, solid fine coal transferpump 17 and the high-pressure powdered coal tank 18 that are connected successively; The outlet of predrying feeding warehouse 1 is connected by the opening for feed of worm conveyor 2 with fluidised bed drying stove 3; The discharge port of fluidised bed drying stove 3 is connected by the entrance of predrying chapelet 7 with powder process charging coal bunker 8, the outlet of powder process charging coal bunker 8 is connected with the entrance of vertical spindle coal pulveriser 12 by giving hermetically sealed belt material machine 9, and the outlet of vertical spindle coal pulveriser 12 is connected by the entrance of powder process chapelet 15 with Pulverized Coal Bin 16; The cyclic steam outlet N2 of fluidised bed drying stove 3 is connected tornado dust collector 4, predrying sack cleaner 5 and centrifugal blower 6 successively with between cyclic steam entrance N3, N4; The dust outlet of tornado dust collector 4 is all connected with the pipeline of the discharge port of fluidised bed drying stove 3 with the dust outlet of predrying sack cleaner 5; Vertical spindle coal pulveriser 12 is also connected with fuel gas hot-blast stove 11, and fuel gas hot-blast stove 11 is also connected with gas blower 10; Also be connected with powder process sack cleaner 13 between vertical spindle coal pulveriser 12 and powder process chapelet 15, on the pipeline between vertical spindle coal pulveriser 12 and fuel gas hot-blast stove 11 and between powder process sack cleaner 13, be also connected with Vertical Mill exhaust blower 14.
Be fluidised bed drying stove 3 as shown in Figures 2 and 3, comprise fluid bed drying oven cavity (not marking in figure), a feed valve N1, a bleeder valve N5, heating tube (not marking in figure) and interconnective two groups of gas distributor N10; Feed valve N1 and bleeder valve N5 is located at top and the bottom of fluidised bed drying furnace cavity respectively; Fluidised bed drying furnace chamber body wall top is provided with a cyclic steam outlet N2, and fluidised bed drying furnace chamber body wall arranges 2 cyclic steam entrances N3, N4 in gas distributor N10 place; Heating tube comprises epimere heating tube and hypomere heating tube, and epimere heating tube and hypomere heating tube are divided into the upper and lower in fluidised bed drying furnace cavity; Epimere heating tube is provided with heating steam inlet I N6 and vapor condenses water out I N7, and hypomere heating tube is provided with heating steam inlet II N8 and vapor condenses water out II N9; Gas distributor N10 is located in fluidised bed drying furnace cavity, and two groups of gas distributor N10 are all connected with cyclic steam entrance N3, N4, and are located between epimere heating tube and hypomere heating tube; The upper, middle and lower of fluidised bed drying stove is respectively equipped with 6 mirror mouth S1-S6.
Be solid fine coal transferpump 17 structure as Figure 4-Figure 6, conveyor piston 171, piston cylinder 172, drive unit 173, transfer line 174, pressure-balanced valve 175 and a vent valve 176.Wherein, piston cylinder 172 comprises driving cylinder 1721 and fine coal cylinder 1722, and conveyor piston 171 is slidably arranged in piston cylinder 172, and conveyor piston 171 has the through hole 1711 of a connection fine coal cylinder 1722.The discharge end of fine coal cylinder 1722 is provided with a blow-off valve 1723, and fine coal cylinder 1722 is connected with high-pressure powdered coal tank 18 by blow-off valve 1723.Drive unit 173 is fixedly installed on driving cylinder 1721, for driving conveyor piston 171 linear reciprocating motion in piston cylinder 172.The feed end of transfer line 174 connects dried coal powder feedway (not shown), and discharge end is connected with fine coal cylinder 1722 by through hole 1711.Pressure-balanced valve 175 and vent valve 176 are arranged on the discharge end place of fine coal cylinder 1722, and are positioned at blow-off valve 1723 front end, and fine coal cylinder 1722 is connected with high-pressure powdered coal tank 18 by pressure-balanced valve 175, is connected with atmospheric pressure environment by vent valve 176;
Transfer line 174 comprises hopper 1745 in an outer hopper 1741, many outer feeding bent pipes 1742, many charging expansion pipes 1743, many interior feeding bent pipes 1744 and, outer hopper 1741 is connected with dried coal powder feedway by an outer feed valve 1746, and outer feed valve 1746 is for controlling the opening and closing of outer hopper 1741.Each charging expansion pipe 1743 comprises and is fixed on interior pipe on drive unit 173 outer wall and relative to the slidable outer tube of interior pipe, the interior pipe of charging expansion pipe 1743 is connected with outer hopper 1741 respectively by an outer feeding bent pipe 1742.The interior Guan Jun of outer hopper 1741, outer feeding bent pipe 1742 and charging expansion pipe 1743 is positioned at driving cylinder 1722 outside, and composition transfer line 174 is positioned at the part outside piston cylinder 172.The outer tube of charging expansion pipe 1743 is connected with interior hopper 1745 respectively by feeding bent pipe 1744 in, and interior hopper 1745 is arranged on conveyor piston 171, and be connected with through hole 1711 by feed valve 1747 in, interior feed valve 1747 is for controlling the opening and closing of interior hopper 1745.The outer tube of charging expansion pipe 1743, interior feeding bent pipe 1744 and interior hopper 1745 are all positioned at driving cylinder 1721, and composition transfer line 174 is positioned at the part of piston cylinder 172;
Described solid fine coal transferpump also comprises a ball head connecting piece 177, this ball head connecting piece 177 one end is connected with drive unit 173, the other end arranges many pillar stiffeners 1771, conveyor piston 171 is fixedly connected with ball head connecting piece 177 by pillar stiffener 1771, and ensure there are enough spaces between conveyor piston 171 and ball head connecting piece 177, for holding interior parts such as hopper 1745 grade; The outer tube of charging expansion pipe 1743 is fixedly installed on ball head connecting piece 177, and drive unit 173 drives ball head connecting piece 177 to move, thus drive conveyor piston 171 and transfer line 174 be positioned at piston cylinder 172 partly together with move;
On ball head connecting piece 177, be also provided with an anti-rotary column 1772 through driving cylinder 1721 top, anti-rotary column 1772 can prevent conveyor piston 171 from rotating in moving process, causes charging expansion pipe 1743 to be cut damage;
Between conveyor piston 171 and piston cylinder 172 inwall, between the inner and outer pipe of charging expansion pipe 1743, Y type wear ring 178 is adopted to seal, Y type wear ring 178 possesses integrated abrasion compensation, still can ensure the sealing property between conveyor piston 171 and piston cylinder 172 inwall and between the inner and outer pipe of charging expansion pipe 1743 after the wearing and tearing of Y type wear ring 178; Piston cylinder 172 inwall that conveyor piston 171 passes through is continuous sealing face, effectively extends the work-ing life of Y type wear ring 178;
Piston cylinder 172 is also provided with bracing or strutting arrangement 179, for supporting dried coal powder e Foerderanlage of the present invention;
Drive unit 173 is power hydraulic cylinder, and outer feeding bent pipe 1742, charging expansion pipe 1743 and interior feeding bent pipe 1744 are three, and pillar stiffener 1771 is four.
Two, predrying, the powder process of feed coal and conveying
Carry out that feed coal is predrying according to treatment system as shown in Figure 1, powder process and conveying, concrete grammar is as follows: the broken coal (particle diameter≤6mm in predrying feeding warehouse 1, water content is 28%) enter fluidised bed drying stove 3 through worm conveyor 2 by the feed valve in fluidised bed drying furnace roof portion, broken coal is heated by the low-pressure steam in heating tube in stove, the temperature of low-pressure steam is 175 DEG C, pressure is 0.8MPaG, and the predrying residence time can be 30 ~ 90min; Dried coal dust, through the blow-off valve discharge of fluidised bed drying furnace bottom, enters powder process charging coal bunker 8 by predrying chapelet 7.Tiny fine coal in fluidised bed drying stove in broken coal trips out fluidised bed drying stove 3 with superheated vapour one, order enters tornado dust collector 4, predrying sack cleaner 5 carries out gas solid separation, isolated fine coal is by predrying chapelet 7 system powder charging coal bunker 8, an isolated superheated vapour part goes water reclamation system in coal, another part removes centrifugal blower 6, sends into fluidised bed drying stove 3 recycle by centrifugal blower 6.
Moisture-free coal in powder process charging coal bunker 8 enters vertical spindle coal pulveriser 12 by after hermetically sealed belt feeder 9 Weighing through fuel dropping pipe.In vertical spindle coal pulveriser 12, at about-150pa, room temperature (25 DEG C) and inert gas environment, (main component is nitrogen or carbonic acid gas to raw coal, oxygen level≤8mol%) in grinding, after grinding coal particle size≤90 μm account for 90%, particle diameter≤5 μm account for 10%.Coal-grinding adopts heat smoke dry, and produce after the high-temperature flue gas that heat smoke is produced by fuel gas hot-blast stove 11 and circulation indifferent gas Homogeneous phase mixing, the temperature of heat smoke is 240 DEG C, and fuel gas burning required air is provided by gas blower 10.Coal dust after grinding and the mixture of rare gas element (nitrogen) are transported to that powder process sack cleaner 13 carries out gas, powder is separated, and isolated coal dust enters Pulverized Coal Bin 16 through powder process chapelet 15.Isolate the gas after coal dust (weary gas) to be taken away by Vertical Mill exhaust blower 14, major part enters fuel gas hot-blast stove 11 outlet line and recycles, and excessive gas is emptying.
In Pulverized Coal Bin 16, dried coal powder is pressurized to 5.0MpaG through solid fine coal transferpump 17, is transported to high pressure coal dust pot 18, and specific implementation process is as follows:
Fill process: piston is in bottom the pump housing, feed valve is opened, and piston rises, and dried coal powder enters pump body from Pulverized Coal Bin 16 by flexible tremie pipe, feed valve by action of gravity, and when piston rises to solid pump top, charging completes, and feed valve cuts out.
Discharging process: blow-off valve is opened, piston declines, and pump body pressure raises, when pump housing internal pressure and 18 pressure equilibrium of high pressure coal dust pot, dried coal powder enters high pressure coal dust pot 18 by action of gravity, when piston drops to bottom the pump housing, discharge completes, and blow-off valve cuts out.
Exhaust process: vent valve is opened, pump body clearance high pressure gas are emptying by vent valve, after being vented, exhaust valve closure.
Repeat above-mentioned charging, discharge, exhaust process, dried coal powder can be realized to be transported in high pressure coal dust pot 18 by Pulverized Coal Bin 16, and then be delivered to pressurized-gasification furnace burner through nitrogen or carbonic acid gas.
In the present invention, the concrete using method of solid fine coal transferpump comprises the following steps:
1) outer feed valve 1741 is opened.
2) charging: conveyor piston 171 is in the starting position of fine coal cylinder 1722 discharge end, opens interior hopper 1745; Drive unit 173 drives conveyor piston 171 to move to driving cylinder 1721 relative to piston cylinder 172, and produce negative pressure relative to the external world in fine coal cylinder 1722, dried coal powder is inhaled in fine coal cylinder 1722 from atmospheric pressure environment by transfer line 174; Conveyor piston 171 moves to driving cylinder 1721 and fine coal cylinder 1722 junction always, and charging completes; Hopper 1745 in closing.
3) pressure equilibrium: open pressure-balanced valve 175, fine coal cylinder 1722 is communicated with high-pressure powdered coal tank 18, high pressure gas then in high-pressure powdered coal tank 18 enter in fine coal cylinder 1722 by pressure-balanced valve 175, fine coal cylinder 1722 internal pressure is raised gradually, until fine coal cylinder 1722 internal pressure and high-pressure powdered coal tank 18 internal pressure balance; Closing presure equilibrium valve 175.
4) discharge: open blow-off valve 1723, drive unit 173 drives conveyor piston 171 to move relative to the discharge end of piston cylinder 172 to fine coal cylinder 1722, dried coal powder is pressed into high-pressure powdered coal tank 18; When conveyor piston 171 moves to fine coal cylinder 1722 discharge end completely, discharge completes; Close blow-off valve 1723.
5) be vented: open vent valve 176, by the high-pressure gas emptying of inner for fine coal cylinder 1722 clearance place, make again to reach atmospheric pressure environment in fine coal cylinder 1722; Close vent valve 176.
6) repeating step 2) ~ step 5), go round and begin again, steady running, can realize continuously dried coal powder being transported to high-pressure powdered coal tank 18 from atmospheric pressure environment.
The inventive method adopts the lower steam of energy level to carry out predrying as heating medium to coal dust, have obvious environmental protection and energy saving advantage, and coal is applied widely.Dried coal powder Solid Conveying and Melting pump configuration is simple, and can greatly reduce the energy in fine coal course of conveying and the consumption of conveying gas, course of conveying efficiency is high, energy-conserving and environment-protective, and device can realize automatically running continuously, and can meet the demand of large-scale industrial production.
Below describe embodiment of the present invention in detail, a lot of improvement can be done for a person skilled in the art obviously and change and essence spirit of the present invention can not be deviated from.All these changes and improvements are all within protection scope of the present invention.
Claims (10)
1. a method for predrying, the powder process of feed coal and conveying, comprises the steps: 1) broken coal in predrying feeding warehouse is transported in fluidised bed drying stove predrying, obtain predrying after broken coal enter powder process charging coal bunker;
Described fluidised bed drying stove comprises fluid bed drying oven cavity, a feed valve, a bleeder valve, heating tube and interconnective two groups of gas distributors; Described feed valve and described bleeder valve are located at top and the bottom of described fluidised bed drying furnace cavity respectively; Described fluidised bed drying furnace chamber body wall top is provided with a cyclic steam outlet, and described fluidised bed drying furnace chamber body wall arranges 2 cyclic steam entrances in described gas distributor place; Described heating tube comprises epimere heating tube and hypomere heating tube, and described epimere heating tube and described hypomere heating tube are divided into the upper and lower in described fluidised bed drying furnace cavity; Described epimere heating tube is provided with heating steam inlet I and vapor condenses water out I, and described hypomere heating tube is provided with heating steam inlet II and vapor condenses water out II; Described gas distributor is located in described fluidised bed drying furnace cavity, and described two groups of gas distributors are all connected with described cyclic steam entrance, and is located between described epimere heating tube and described hypomere heating tube; The upper, middle and lower of described fluidised bed drying stove is respectively equipped with multiple mirror mouth;
2) described predrying after broken coal sent in coal pulverizer by described powder process charging coal bunker and grind, the coal dust obtained sends into Pulverized Coal Bin;
3) described coal dust is delivered in high-pressure powdered coal tank through solid fine coal transferpump by described Pulverized Coal Bin, and then is delivered to pressurized-gasification furnace burner through nitrogen or carbonic acid gas;
Described solid fine coal transferpump comprises a conveyor piston, a piston cylinder, a drive unit, a transfer line, a pressure-balanced valve and a vent valve; Described piston cylinder comprises driving cylinder and fine coal cylinder, and described conveyor piston is slidably arranged in described piston cylinder, and described conveyor piston has the through hole of the described fine coal cylinder of a connection; The discharge end of described fine coal cylinder is provided with a blow-off valve, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described blow-off valve; Described drive unit is fixedly installed on described driving cylinder; The feed end of described transfer line connects described Pulverized Coal Bin, and discharge end is connected with described fine coal cylinder by described through hole; Described pressure-balanced valve and described vent valve are arranged on the discharge end place of described fine coal cylinder, and are positioned at described blow-off valve front end, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described pressure-balanced valve, is connected with atmospheric pressure environment by described vent valve.
2. method according to claim 1, is characterized in that: the particle diameter≤6mm of described broken coal, described broken coal containing water gaging be 20 ~ 65%;
Described broken coal is heated by heating tube described in described fluidised bed drying stove;
The temperature of the steam in described heating tube is 159 ~ 220 DEG C;
The pressure of the steam in described heating tube is 0.5 ~ 1.0MPaG;
Described predrying after the water content of broken coal be 2 ~ 12%;
The predrying residence time of described broken coal is 30 ~ 90min.
3. method according to claim 1 and 2, is characterized in that: described predrying after the inert atmosphere of broken coal in described coal pulverizer in grind;
Pressure in described coal pulverizer is-600 ~-100Pa;
Temperature in described coal pulverizer is 10 ~ 30 DEG C;
When described predrying after the water content of broken coal be 3 ~ 12% time, step 2) in also comprise by described predrying after the step of broken coal drying.
4. method according to claim 3, is characterized in that: described predrying after broken coal adopt heat smoke dry;
The temperature of described heat smoke drying is 150 ~ 300 DEG C;
Described inert atmosphere is nitrogen or carbonic acid gas;
In described inert atmosphere, the content of oxygen is not higher than 8mol%;
Described heat smoke is produced after the high-temperature flue gas that fuel gas burning produces mixes with the described noble gas atmosphere of circulation by inert gas generator;
Described fuel gas burning required air is provided by gas blower.
5. the method according to any one of claim 1-4, is characterized in that: the particle diameter of described coal dust is that the content of 5 ~ 90 μm accounts for more than 80%;
Described coal dust is 3 ~ 5MpaG through the pressure of described solid fine coal transferpump conveying pressurization.
6. the method according to any one of claim 1-5, is characterized in that: described fluidised bed drying stove is a square cavity;
Described transfer line comprises an outer hopper be connected with described dried coal powder feedway by an outer feed valve, many outer feeding bent pipes, many charging expansion pipes, many interior feeding bent pipes and are arranged on described conveyor piston and hopper in being connected with described through hole by feed valve in, described outer feed valve is for controlling the opening and closing of described outer hopper, and described interior feed valve is for controlling the opening and closing of described interior hopper; Charging expansion pipe described in each comprises the interior pipe be fixed on described drive unit outer wall and the outer tube that can slide relative to described interior pipe, the interior pipe of described charging expansion pipe is connected with described outer hopper respectively by feeding bent pipe outer described in, it is outside that the interior Guan Jun of described outer hopper, outer feeding bent pipe and charging expansion pipe is positioned at described driving cylinder, forms described transfer line and be positioned at part outside described piston cylinder; The outer tube of described charging expansion pipe is connected with described interior hopper respectively by feeding bent pipe interior described in, the outer tube of described charging expansion pipe, interior feeding bent pipe and interior hopper are all positioned at described driving cylinder, form the part that described transfer line is positioned at described piston cylinder.
7. the method according to any one of claim 1-6, is characterized in that: described solid fine coal transferpump also comprises a ball head connecting piece, an anti-rotary column;
Described ball head connecting piece one end is connected with described drive unit, and the other end is fixedly connected with described conveyor piston by many pillar stiffeners; The space being positioned at described piston cylinder part for holding described transfer line is formed between described conveyor piston and described ball head connecting piece; The outer tube of described charging expansion pipe is fixedly installed on described ball head connecting piece, and described drive unit drives described ball head connecting piece to move, thus drive described conveyor piston and transfer line be positioned at described piston cylinder part together with move;
Described anti-rotary column is arranged on described ball head connecting piece through described driving cylinder top;
Between described conveyor piston and described piston cylinder inwall, between the inner and outer pipe of described charging expansion pipe, Y type wear ring is adopted to seal; The described piston cylinder inwall that described conveyor piston passes through is continuous sealing face;
Described piston cylinder is also provided with bracing or strutting arrangement, for supporting described dried coal powder e Foerderanlage.
8. the dedicated processes system of method according to any one of claim 1-7, is characterized in that: it comprises the predrying feeding warehouse be connected successively, described fluidised bed drying stove, described powder process charging coal bunker, described coal pulverizer, described Pulverized Coal Bin, described solid fine coal transferpump and described high-pressure powdered coal tank;
The outlet of described predrying feeding warehouse is connected by the opening for feed of described worm conveyor with described fluidised bed drying stove; The discharge port of described fluidised bed drying stove is connected by the entrance of predrying chapelet with described powder process charging coal bunker, the outlet of described powder process charging coal bunker is connected by the entrance of feeding machine with described coal pulverizer, and the outlet of described coal pulverizer is connected by the entrance of powder process chapelet with described Pulverized Coal Bin;
Described fluidised bed drying stove comprises fluid bed drying oven cavity, a feed valve, a bleeder valve, heating tube and interconnective two groups of gas distributors; Described feed valve and described bleeder valve are located at top and the bottom of described fluidised bed drying furnace cavity respectively; Described fluidised bed drying furnace chamber body wall top is provided with a cyclic steam outlet, and described fluidised bed drying furnace chamber body wall arranges 2 cyclic steam entrances in described gas distributor place; Described heating tube comprises epimere heating tube and hypomere heating tube, and described epimere heating tube and described hypomere heating tube are divided into the upper and lower in described fluidised bed drying furnace cavity; Described epimere heating tube is provided with heating steam inlet I and vapor condenses water out I, and described hypomere heating tube is provided with heating steam inlet II and vapor condenses water out II; Described gas distributor is located in described fluidised bed drying furnace cavity, and described two groups of gas distributors are all connected with described cyclic steam entrance, and is located between described epimere heating tube and described hypomere heating tube; The upper, middle and lower of described fluidised bed drying stove is respectively equipped with multiple mirror mouth;
Described solid fine coal transferpump comprises a conveyor piston, a piston cylinder, a drive unit, a transfer line, a pressure-balanced valve and a vent valve; Described piston cylinder comprises driving cylinder and fine coal cylinder, and described conveyor piston is slidably arranged in described piston cylinder, and described conveyor piston has the through hole of the described fine coal cylinder of a connection; The discharge end of described fine coal cylinder is provided with a blow-off valve, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described blow-off valve; Described drive unit is fixedly installed on described driving cylinder; The feed end of described transfer line connects described Pulverized Coal Bin, and discharge end is connected with described fine coal cylinder by described through hole; Described pressure-balanced valve and described vent valve are arranged on the discharge end place of described fine coal cylinder, and are positioned at described blow-off valve front end, and described fine coal cylinder is connected with described high-pressure powdered coal tank by described pressure-balanced valve, is connected with atmospheric pressure environment by described vent valve.
9. treatment system according to claim 8, is characterized in that: the described cyclic steam outlet of described fluidised bed drying stove is connected tornado dust collector, predrying sack cleaner and centrifugal blower successively with between described cyclic steam entrance; The dust outlet of described tornado dust collector is all connected with the pipeline of the discharge port of described fluidised bed drying stove with the dust outlet of described predrying sack cleaner;
Described fluidised bed drying stove is a square cavity;
Described transfer line comprises an outer hopper be connected with described dried coal powder feedway by an outer feed valve, many outer feeding bent pipes, many charging expansion pipes, many interior feeding bent pipes and are arranged on described conveyor piston and hopper in being connected with described through hole by feed valve in, described outer feed valve is for controlling the opening and closing of described outer hopper, and described interior feed valve is for controlling the opening and closing of described interior hopper; Charging expansion pipe described in each comprises the interior pipe be fixed on described drive unit outer wall and the outer tube that can slide relative to described interior pipe, the interior pipe of described charging expansion pipe is connected with described outer hopper respectively by feeding bent pipe outer described in, it is outside that the interior Guan Jun of described outer hopper, outer feeding bent pipe and charging expansion pipe is positioned at described driving cylinder, forms described transfer line and be positioned at part outside described piston cylinder; The outer tube of described charging expansion pipe is connected with described interior hopper respectively by feeding bent pipe interior described in, the outer tube of described charging expansion pipe, interior feeding bent pipe and interior hopper are all positioned at described driving cylinder, form the part that described transfer line is positioned at described piston cylinder.
10. the treatment system described in claim 8 or 9, is characterized in that: described coal pulverizer is also connected with fuel gas hot-blast stove, and described fuel gas hot-blast stove is also connected with gas blower;
Also be connected with powder process sack cleaner between described coal pulverizer and described powder process chapelet, on the pipeline between described coal pulverizer and described fuel gas hot-blast stove and between described powder process sack cleaner, be also connected with Vertical Mill exhaust blower;
Described solid fine coal transferpump also comprises a ball head connecting piece, an anti-rotary column;
Described ball head connecting piece one end is connected with described drive unit, and the other end is fixedly connected with described conveyor piston by many pillar stiffeners; The space being positioned at described piston cylinder part for holding described transfer line is formed between described conveyor piston and described ball head connecting piece; The outer tube of described charging expansion pipe is fixedly installed on described ball head connecting piece, and described drive unit drives described ball head connecting piece to move, thus drive described conveyor piston and transfer line be positioned at described piston cylinder part together with move;
Described anti-rotary column is arranged on described ball head connecting piece through described driving cylinder top;
Between described conveyor piston and described piston cylinder inwall, between the inner and outer pipe of described charging expansion pipe, Y type wear ring is adopted to seal; The described piston cylinder inwall that described conveyor piston passes through is continuous sealing face;
Described piston cylinder is also provided with bracing or strutting arrangement, for supporting described dried coal powder e Foerderanlage.
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