CN203112784U - Medium-speed mill direct-firedpulverizing power generation system for sodium removal pretreatment by fluidizing high sodium coal through exhaust gas - Google Patents
Medium-speed mill direct-firedpulverizing power generation system for sodium removal pretreatment by fluidizing high sodium coal through exhaust gas Download PDFInfo
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- CN203112784U CN203112784U CN 201320121127 CN201320121127U CN203112784U CN 203112784 U CN203112784 U CN 203112784U CN 201320121127 CN201320121127 CN 201320121127 CN 201320121127 U CN201320121127 U CN 201320121127U CN 203112784 U CN203112784 U CN 203112784U
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Abstract
The utility model discloses a medium-speed mill direct-firedpulverizing power generation system for sodium removal pretreatment by fluidizing high sodium coal through exhaust gas. The system comprises a fluidized drying device, a raw coal sodium removal pretreatment device, a medium-speed coal mill, a pulverized coal distributer, an air feeder, a seal fan, an air preheater and asteam turbine generator unit, wherein the fluidized drying device is connected with a coal inlet of the medium-speed coal mill and an exhaust gas outlet of thesteam turbine generator unit; and a sodium-removed coal outlet of the raw coal sodium removal pretreatment device is connectedwitha coal inlet of the fluidized drying device. The total moisture of the high-quality clean coal obtained by the system is controlled within 8 percent, the sodium content is controlled within 2 percent, and the heating value of the coal is improved to more than 5,500 kilocalories, so that the drying capacity of a pulverizing system is greatly improved, the combustion performance of the pulverized coal is improved, and the generating efficiency of the power generation system is greatly improved.
Description
Technical field
The utility model relates to the coal fired power generation technical field, relates in particular to the high sodium coal of a kind of weary air-flowization and takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system.
Background technology
High sodium coal refers to the higher special coal of a class of alkali metal compound composition in the coal.In all kinds of alkali metal compounds, generally in the majority with the sodium based compound, so be referred to as " high sodium coal ".At present, the high sodium coal of China mainly concentrates on the accurate eastern coalfield of Xinjiang Junggar Basin east.Accurate eastern coalfield resources reserves reach 3,900 hundred million tons, and adding up at present to verify the coal resources reserves is 2,136 hundred million tons, and 1.4 ten thousand square kilometres of coalfield coal-forming areas are the self-contained coalfields of the current maximum of China.Calculate with present coal in China annual production, just can use 100 years in the whole nation in the eastern coalfield of standard.Because resources reserve is abundant and the strip mining transformation cost is low, accurate eastern coalfield has become the hot zones of coal in China industry new round investment.
Accurate eastern coal belongs to the fat coal of special low ash content, special low-sulfur, high heating value (gross calorific value), low metamorphic grade.No matter be as generating or be used for doing the raw material of Coal Chemical Industry, all be lowly pollute, the raw material of low emission, can effectively save the treatment of wastes produced expense.Good basic substance has been laid in all the be as the criterion coal electricity in east area and the development of Coal Chemical Industry of these superior natural condition.Total installation of generating capacity is 1,800 ten thousand KW with regard to the generation current of Xinjiang, according to country " 12 " planning and the planning of Xinjiang the coming five years, Xinjiang will reach 100,000,000 KW in 12.5 last installed capacitys, and wherein accurate eastern coalfield is " Xin Diandong send " topmost energy safeguard base.
The ature of coal in area, accurate east has following characteristics: middle high-moisture; Medium calorific value; Easily catch fire, easy to burn out; Strong coking; High basic metal content, contamination property by force.The result of trial operation of low capacity unit shows: when accurate eastern high sodium coal is used for plant generator factory fire coal, heating surface, economizer, air preheater contamination problem at boiler are very serious, basic metal is also very serious to the bulk material corrosion of boiler, and deslagging is also very difficult.Therefore, strong coking has proposed great challenge with strong contamination property to design and the operation of firing accurate eastern coal utility boiler, when firing accurate eastern coal entirely in the boiler stove coking very serious with heating surface contamination problem, boiler can't long-time running.Trace it to its cause, these problems all with coal ash in alkali metal content higher closely related.
At present, the accurate eastern coal that existing power generation system can only be utilized 20-30% with mix burning after other coal is mixed, it is very limited to aim at eastern coal usage quantity like this, again from other local high-quality fire coal of buying, has increased the cost of electricity-generating of electricity power enterprise simultaneously.Aim at the exploitation in eastern coalfield and the construction in power supply base and brought difficulty, therefore be difficult to the advantage of the eastern coal of standard is given full play to.
Other mixes the burning way for the another kind that generates electricity in order to utilize the eastern high sodium coal of standard: admix a silicon of fixing a number or aluminium sesquioxide etc. as adopting, can adjust the ash fusion point of stove internal combustion, can adopt accurate eastern high sodium coal in boiler, to burn more, also can play certain contamination that improves boiler and the problem of slagging scorification, but increased the effect of attrition boiler work-ing life of boiler simultaneously and reduced coal-fired calorific value, this makes the running cost that must increase construction investment and power plant again.
Therefore, how to reduce the alkali metal content in the accurate eastern coal, safe and economical boiler operation is over a long time guaranteed in anti-slagging scorification, contamination and corrosion, being electricity power enterprise and other industry institute inevitable problem that uses accurate eastern coal, also is the significant challenge that the construction of base of the accurate eastern coal electricity of current development faces.
Simultaneously, in station boiler powder process power generation system, medium-speed pulverizer is low because of the powder process power consumption, maintenance workload is little, the varying load performance is good etc., and advantage is widely used in burning smoke coal and the meager coal unit.But the common dry undercapacity of existing medium-speed pulverizer not only makes the coal powder performance variation, also influences simultaneously coal pulverizer and grinds to exert oneself and cause boiler output lower, makes the power generation system inefficiency.
Summary of the invention
Based on this, at above-mentioned technical problem, provide the high sodium coal of a kind of weary air-flowization to take off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
The high sodium coal of a kind of weary air-flowization takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, comprise the fluidized drying device, raw coal takes off the sodium pretreatment unit, medium-speed pulverizer, pulverized coal distributor, fan, seal fan, be located at the air preheater in the boiler flue, the turbine driven set that is connected with described boiler, described fluidized drying device is connected with the coal inlet of medium-speed pulverizer and the weary gas outlet of described turbine driven set, the sodium coal export that takes off that described raw coal takes off the sodium pretreatment unit is connected with the coal inlet of described fluidized drying device, the meal outlet of described medium-speed pulverizer is connected with the burner of described boiler through described pulverized coal distributor, described fan connects described air preheater, described air preheater divides two-way, one the tunnel connects described burner, another road connects the blast inlet of described medium-speed pulverizer, and described seal fan connects the sealing air port of described medium-speed pulverizer.
Described fluidized drying device comprises drying tube, be located at fluidized-bed and first heating tube in the described drying tube, be located at described drying tube outer sack cleaner and first heat-exchanger rig, described drying tube is provided with the air outlet, coal inlet, coal outlet, first air intake and second air intake, described air outlet and coal inlet are positioned at the top of described fluidized-bed, described coal outlet and second air intake are positioned at the below of described fluidized-bed, described air outlet is connected with described first heat-exchanger rig through described sack cleaner, air outlet one blower fan of described first heat-exchanger rig is connected with described second air intake, described coal outlet and sack cleaner all are connected with the coal inlet of described medium-speed pulverizer, the weary gas outlet of described turbine driven set is connected with described first heating tube through described first air intake, and described first heating tube is positioned at the top of described fluidized-bed.
Described raw coal takes off the sodium pretreatment unit and comprises:
Spray-type lacks the gas water cooler, is provided with spray header in the weary gas water cooler of described spray-type, and the air outlet of described first heat-exchanger rig also is connected through the weary gas water cooler of a blower fan and spray-type;
The raw coal that is connected with the weary gas water cooler of described spray-type takes off the sodium device, and described raw coal takes off the sodium utensil the raw coal entrance, and described raw coal takes off and is provided with second heating tube in the sodium device, and described second heating tube is connected with described first heating tube;
Take off the coal liquid/gas separator that the sodium device is connected with described raw coal, described coal liquid/gas separator has the sodium of taking off coal export, and the described sodium coal export that takes off is connected with the coal inlet of described drying tube;
Be used for cooling from second heat-exchanger rig of the coal washing waste water of coal liquid/gas separator, described second heat-exchanger rig is connected with described coal liquid/gas separator;
For the treatment of the water treating device of cooled coal washing waste water, described water treating device is connected with described second heat-exchanger rig, and it is also by a water pump and the weary gas water cooler of described spray-type.
This programme also comprises sodium potassium concentrated solution retrieving arrangement, and described sodium potassium concentrated solution retrieving arrangement is connected with described coal liquid/gas separator.
The utility model takes off by raw coal to be received pretreatment unit and high sodium coal is taken off sodium handles, high sodium coal is become the clean coal of high-quality, thereby significantly improve or fundamentally solve the interior coking of stove and heating surface contamination that the high sodium coal power generation unit of combustion faces, significant problems such as corrosion, be applicable to that effectively accurate eastern coal and other contain the sodium height, the purification upgrading of moisture high low grade coal is handled, and by the fluidized drying device coal is carried out predrying and fluidized drying, the former moisture content of coal that enters medium-speed pulverizer is significantly reduced, the full moisture content control of the clean coal of the high-quality that obtains is in 8% like this, sodium content control is in 2%, the thermal value of coal is promoted to more than 5500 kilocalories, and then the pulverized coal preparation system drying is exerted oneself significantly improve, the combustionproperty grow of coal dust has improved the power generation system generating efficiency greatly; In addition, the abundant recycle of the utility model system the waste liquid that produces in the system work process, waste gas and heat energy, saved cost of electricity-generating.
Description of drawings
Be elaborated below in conjunction with the drawings and specific embodiments the utility model:
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, the high sodium coal of a kind of weary air-flowization takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, comprises that fluidized drying device, raw coal take off sodium pretreatment unit, medium-speed pulverizer 11, pulverized coal distributor 12, fan 13, seal fan 14, air preheater 15, turbine driven set 16 and sodium potassium concentrated solution retrieving arrangement 17.
The fluidized drying device is connected with the coal inlet of medium-speed pulverizer 8 and the weary gas outlet of turbine driven set 13, and the sodium coal export that takes off that raw coal takes off the sodium pretreatment unit is connected with the coal inlet of fluidized drying device.
Particularly, the fluidized drying device is made of drying tube 1, fluidized-bed 2, first heating tube 3, sack cleaner 4, first heat-exchanger rig 5.
Wherein, fluidized-bed 2 and first heating tube 3 are positioned at the top that drying tube 1, the first heating tube 3 is positioned at fluidized-bed 2, and sack cleaner 4 and first heat-exchanger rig 5 are positioned at outside the drying tube 1.
Drying tube 1 is provided with air outlet, coal inlet, coal outlet, first air intake and second air intake, and air outlet and coal inlet are positioned at the top of fluidized-bed 2, and coal outlet and second air intake are positioned at the below of fluidized-bed 2.
The air outlet of drying tube 1 is connected with first heat-exchanger rig 5 through sack cleaner 4 and blower fan 18, first heat-exchanger rig 5 is connected with second air intake through blower fan 19 again, the coal outlet of drying tube 1 coal outlet and sack cleaner 6 all is connected with the coal inlet of medium-speed pulverizer 11, and first air intake of the weary gas outlet drying pipe 1 of the turbine driven set 16 that is connected with boiler 20 is connected with first heating tube 3.
Wherein, the water coolant tube bank can be set in first heat-exchanger rig 5, and the water of condensation of its generation can be recycled again.
Raw coal takes off the sodium pretreatment unit and comprises that spray-type lacks gas water cooler 6, raw coal takes off sodium device 7, coal liquid/gas separator 8, second heat-exchanger rig 9 and water treating device 10.
Particularly, the weary gas water cooler 6 of spray-type can external warm water, it has weary gas entrance, waste gas outlet, water-in and water outlet, and be provided with spray header 21 in it, the air outlet of first heat-exchanger rig 5 also is connected through the weary gas entrance of blower fan 22 with the weary gas water cooler 6 of spray-type, and waste gas outlet can be connected to thionizer 32.
The water outlet that raw coal takes off the weary gas water cooler 6 of sodium device 7 and spray-type is connected, and it has the raw coal entrance, and raw coal takes off and is provided with second heating tube, 24, the second heating tubes 24 in the sodium device 7 and is connected with first heating tube 3.
Coal liquid/gas separator 8 takes off sodium device 7 with raw coal and is connected, and it has the sodium of taking off coal export, takes off the sodium coal export and is connected indirectly with the coal inlet of drying tube 1.
Second heat-exchanger rig 9 is connected with coal liquid/gas separator 8, is used for cooling from the coal washing waste water of coal liquid/gas separator 8.
Sodium potassium concentrated solution retrieving arrangement 17 is connected with coal liquid/gas separator 10.
The meal outlet of medium-speed pulverizer 11 is connected with the burner 26 of boiler 20 through pulverized coal distributor 12.
The principle of work of native system is as follows:
High sodium coal input raw coal is taken off sodium device 7, the weary gas water cooler 6 of spray-type inserts external warm water, deliver to raw coal and take off sodium device 7, this warm water be infused in the concentrated solution for washing that raw coal takes off sodium device 7 in advance and mix, simultaneously, continue to enter in first heating tube 3 of drying tube 1 from the weary gas of the high temperature of turbine driven set 16, and be delivered to second heating tube 24 that raw coal takes off sodium device 7 from first heating tube 3, cooperate washings that high sodium coal is carried out Hybrid Heating and clean, take off sodium.Wherein, the steam in second heating tube 24 can be recycled after the condensation again.
Under certain temperature and pressure, wash in washing soln by certain hour, be subjected under the dual function of temperature and washing soln, can destroy the balance of former texture of coal, make water and basic metal in raw coal xln and surface and the pore that migration and dissolving take place rapidly, make a large amount of alkali metals in the raw coal comprise that sodium, potassium, mercury, sulphur, ashes etc. migrate in a large number or are dissolved in the washing soln, to reach the purification to raw coal.
Above-mentioned concentrated solution for washing major ingredient is acetic acid or hydrochloric acid and organic solvent, with the blending ratio of water be 1:(50-500), it mainly acts on is the organic class basic metal that removes raw coal.
Taking off coal liquid mixture behind the sodium takes off sodium device 7 from raw coal and enters the coal liquid/gas separator 8, to take off the sodium coal separates with coal washing waste water, the sodium coal of separating that takes off is sent to drying tube 1 by defeated device for coal from the sodium coal export that takes off of coal liquid/gas separator 8, and the coal washing waste water of separating is delivered to second heat-exchanger rig 9, after 9 coolings of second heat-exchanger rig, send in the water treating device 10.
Basic metal in 10 pairs of coal washing waste waters of water treating device etc. is handled, and the qualified water after the processing is delivered to the weary gas water cooler 6 of spray-type as recirculated water by pump 25, as the spray water.
The basic metal waste liquid can be imported in the sodium potassium concentrated solution retrieving arrangement 17, after concentrating and separating, can be used as industrial chemicals production chemical product.
High sodium coal is after raw coal takes off the sodium pretreatment unit and takes off sodium, take off the sodium coal and send into drying tube 1, and place on the fluidized-bed 2, the weary gas of high temperature from turbine driven set 16 enters in first heating tube 3 of drying tube 1 simultaneously, heating wherein take off the sodium coal, carry out predrying, at this moment, the a part of moisture content that takes off in the sodium coal forms steam, the air outlet of steam drying pipe 1, sack cleaner 4 and blower fan 18 enter first heat-exchanger rig 5, first heat-exchanger rig 5 liquefies the moisture content in the steam, the gas of remaining relatively dry divides two-way to carry, one the tunnel is delivered to the weary gas entrance of the weary gas water cooler 6 of spray-type through blower fan 22, and another road is delivered to second air intake of drying tube 1 at a high speed through blower fan 19.
Weary gas from first heat-exchanger rig, 5 relatively dries enters the weary gas water cooler 6 of spray-type, sprayed by above-mentioned recirculated water, moisture content in the weary gas is further liquefied, form warm water, taking off sodium device 7 for raw coal uses, can save external warm water resource, and remaining waste gas enters thionizer 32 by the waste gas outlet that spray-type lacks gas water cooler 6.
Because the effect of blower fan 19, dry weary gas makes the sodium coal that takes off on the fluidized-bed 2 that fluidized drying further take place from bottom to top at a high speed by fluidized-bed 2, and dry gas has become steam again, a part is taken off sodium coal generation fluidisation pulverizing formation coal dust simultaneously, and this is a precomminution step.
Coal dust after the precomminution is brought sack cleaner 4 into by steam from the air outlet, sack cleaner 4 is separated the coal dust in the steam, and sends into medium-speed pulverizer 11, simultaneously, steam is sent into after first heat-exchanger rig, 5 dryings again in the weary gas water cooler 6 of drying tube 1 and spray-type, so circulation.
In addition, the coal outlet of not taken away by steam in the drying tube 1 that takes off sodium coal drying pipe 1 enters medium-speed pulverizer 11.
Taking off the sodium coal grinds in medium-speed pulverizer 11, wind powder mixture after grinding enters the mill separator 29 of medium-speed pulverizer 12, isolated meal returns medium-speed pulverizer 11 to be continued to grind, qualified wind powder mixture is sent to each burner 26 after pulverized coal distributor 12 distributes, and sprays into boiler 20 internal combustion by burner 26.
The air of being carried by fan 13 heats by 27 fens two-way of blower fan through air preheater 15, one the tunnel is sent to medium-speed pulverizer 11 as a wind, another road is sent to each burner 26 as secondary air through bellows 28 distribution and is participated in stove internal combustion, steam steam supply turbine generator group 16 generatings that boiler 20 burnings produce are used, the weary gas of its generation can take off the use of sodium pretreatment unit for fluidized drying device and raw coal again, has utilized heat energy fully.
Seal fan 14 provides high pressure cold wind to be used for the sealing of medium-speed pulverizer 111 equipment such as grade.
The waste gas that the flue tail end produces is sent into chimney 23 by smoke duster 30 and blower fan 31.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the utility model, and be not to be used as restriction of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.
Claims (4)
1. the high sodium coal of weary air-flowization takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, it is characterized in that, comprise the fluidized drying device, raw coal takes off the sodium pretreatment unit, medium-speed pulverizer, pulverized coal distributor, fan, seal fan, be located at the air preheater in the boiler flue, the turbine driven set that is connected with described boiler, described fluidized drying device is connected with the coal inlet of medium-speed pulverizer and the weary gas outlet of described turbine driven set, the sodium coal export that takes off that described raw coal takes off the sodium pretreatment unit is connected with the coal inlet of described fluidized drying device, the meal outlet of described medium-speed pulverizer is connected with the burner of described boiler through described pulverized coal distributor, described fan connects described air preheater, described air preheater divides two-way, one the tunnel connects described burner, another road connects the blast inlet of described medium-speed pulverizer, and described seal fan connects the sealing air port of described medium-speed pulverizer.
2. the high sodium coal of a kind of weary air-flowization according to claim 1 takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, it is characterized in that, described fluidized drying device comprises drying tube, be located at fluidized-bed and first heating tube in the described drying tube, be located at described drying tube outer sack cleaner and first heat-exchanger rig, described drying tube is provided with the air outlet, coal inlet, coal outlet, first air intake and second air intake, described air outlet and coal inlet are positioned at the top of described fluidized-bed, described coal outlet and second air intake are positioned at the below of described fluidized-bed, described air outlet is connected with described first heat-exchanger rig through described sack cleaner, air outlet one blower fan of described first heat-exchanger rig is connected with described second air intake, described coal outlet and sack cleaner all are connected with the coal inlet of described medium-speed pulverizer, the weary gas outlet of described turbine driven set is connected with described first heating tube through described first air intake, and described first heating tube is positioned at the top of described fluidized-bed.
3. the high sodium coal of a kind of weary air-flowization according to claim 2 takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, it is characterized in that described raw coal takes off the sodium pretreatment unit and comprises:
Spray-type lacks the gas water cooler, is provided with spray header in the weary gas water cooler of described spray-type, and the air outlet of described first heat-exchanger rig also is connected through the weary gas water cooler of a blower fan and spray-type;
The raw coal that is connected with the weary gas water cooler of described spray-type takes off the sodium device, and described raw coal takes off the sodium utensil the raw coal entrance, and described raw coal takes off and is provided with second heating tube in the sodium device, and described second heating tube is connected with described first heating tube;
Take off the coal liquid/gas separator that the sodium device is connected with described raw coal, described coal liquid/gas separator has the sodium of taking off coal export, and the described sodium coal export that takes off is connected with the coal inlet of described drying tube;
Be used for cooling from second heat-exchanger rig of the coal washing waste water of coal liquid/gas separator, described second heat-exchanger rig is connected with described coal liquid/gas separator;
For the treatment of the water treating device of cooled coal washing waste water, described water treating device is connected with described second heat-exchanger rig, and it is also by a water pump and the weary gas water cooler of described spray-type.
4. the high sodium coal of a kind of weary air-flowization according to claim 3 takes off sodium pre-treatment medium-speed pulverizer blowing powder producing power generation system, it is characterized in that, also comprises sodium potassium concentrated solution retrieving arrangement, and described sodium potassium concentrated solution retrieving arrangement is connected with described coal liquid/gas separator.
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| CN 201320121127 CN203112784U (en) | 2013-03-18 | 2013-03-18 | Medium-speed mill direct-firedpulverizing power generation system for sodium removal pretreatment by fluidizing high sodium coal through exhaust gas |
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| CN 201320121127 CN203112784U (en) | 2013-03-18 | 2013-03-18 | Medium-speed mill direct-firedpulverizing power generation system for sodium removal pretreatment by fluidizing high sodium coal through exhaust gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713113A (en) * | 2015-01-27 | 2015-06-17 | 华北电力大学 | High sodium coal sodium-free upgrading fire coal power generation system integrating solar energy and waste-heat utilization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713113A (en) * | 2015-01-27 | 2015-06-17 | 华北电力大学 | High sodium coal sodium-free upgrading fire coal power generation system integrating solar energy and waste-heat utilization |
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