CN102189024B - Compound pulverizing system based on coal pulverizer - Google Patents
Compound pulverizing system based on coal pulverizer Download PDFInfo
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- CN102189024B CN102189024B CN 201019060024 CN201019060024A CN102189024B CN 102189024 B CN102189024 B CN 102189024B CN 201019060024 CN201019060024 CN 201019060024 CN 201019060024 A CN201019060024 A CN 201019060024A CN 102189024 B CN102189024 B CN 102189024B
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Abstract
A compound pulverizing system based on a coal pulverizer comprises a fine powder separator, a coal dust warehouse, a coal dust feeder, a coal dust mixer, a mill fan, a coal pulverizer, a coal feeder, a crude powder separator and a primary air supply mechanism, wherein the coal feeder is connected with an inlet port of the coal pulverizer; an outlet port of the coal pulverizer is connected with the inlet port of the crude powder separator; an outlet port of the crude powder separator is divided into two routes with one route leading to the fine powder separator through a powder pipe of the coal dust warehouse and transfer valves and the other route leading to primary air pipelines through transfer valves; an exhaust gas outlet port of the fine powder separator is connected with the primary air pipelines through an exhaust pipe, the mill fan and transfer valves; a powder outlet port of the fine powder separator is connected with an inlet port of the coal dust warehouse; and an outlet port of the coal dust warehouse is connected with the primary air pipelines through powder supply pipes, the coal dust feeder and the coal dust mixer. The compound pulverizing system based on a coal pulverizer in the invention has advantages of simple and compact structure, low cost, low energy consumption and good pulverizing effect, and can be widely applied.
Description
Technical field
The present invention is mainly concerned with coal-fired station coal dust preparation system field, refers in particular to a kind of combined type powder manufacturing apparatus.
Background technology
There is following contradiction in unit pulverized-coal system based on various low speed coal mills (singly advancing singly to go out and the type of going with each other all the time) always in design and running: when selection is excessive if low speed coal mill is exerted oneself, the powder process unit power consumption can be always higher when then moving, and economy is poorer when running on the lower load moves; Selection is too small if low speed coal mill is exerted oneself, when then moving because the reasons such as change of granularity of coal-fired caloric value, moisture, ash content, erosive index and raw coal, coal dust chap when causing moving, Mill output deficiency, boiler combustion stability and efficiency of combustion descend the problems such as boiler output deficiency.The reason that this situation occurs is: when (1) coal-fired quality descended, the absolute dosage of coal dust increased, if the rich degree of exerting oneself of coal pulverizer is inadequate, then can cause the coal pulverizer Mill output not enough, can not satisfy the requirement of boiler high load capacity or the power that overfills operation; (2) when coal-fired inferior quality working condition requirement boiler high load capacity or oepration at full load, ventilation in the coal pulverizer increases, and this will cause the coal dust chap of coal pulverizer outlet, thereby combustion stability and efficiency of combustion in the stove are descended, the boiler fly ash carbon content increases, and boiler efficiency descends; (3) in unit pulverized-coal system, the powder process amount of low speed coal mill must change with the variation of boiler load, when boiler load descends, coal pulverizer powder process amount descends, and for low speed coal mill, its no-load power consumption and full-load power consumption differ very little, so the unit power consumption of Ball Mill unit pulverized-coal system is along with the decline of loading increases pro rata.
Summary of the invention
The technical problem to be solved in the present invention just is: for the technical problem that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, energy consumption is low, powder process is effective, applied widely combined type pulverized coal preparation system based on coal pulverizer.
For solving the problems of the technologies described above, the present invention by the following technical solutions.
A kind of combined type pulverized coal preparation system based on coal pulverizer, it is characterized in that: comprise pulverized-coal collector, Pulverized Coal Bin, machine supplying powder, coal, pulverulent fuel mixer, mill exhauster, coal pulverizer, feeder, mill separator and a wind wind sector, described feeder links to each other with the entrance point of coal pulverizer, the port of export of described coal pulverizer links to each other with the arrival end of mill separator, the port of export of described mill separator is divided into two-way, leading up to powder storehouse powder feeding pipe and switch valve links to each other with pulverized-coal collector, and another road links to each other with an airduct by switch valve; The weary gas port of export of described pulverized-coal collector links to each other with an airduct by blast pipe, mill exhauster and switch valve, the flour extraction end of described pulverized-coal collector links to each other with the arrival end of Pulverized Coal Bin, and the port of export of described Pulverized Coal Bin links to each other with an airduct by powder feeding pipe, machine supplying powder and coal, pulverulent fuel mixer.
As a further improvement on the present invention:
The port of export of described Pulverized Coal Bin passes through to link to each other with mill separator behind powder feeding pipe, machine supplying powder, the coal, pulverulent fuel mixer, and the port of export of described mill separator links to each other with an airduct.
Described mill separator comprises shell body and is installed in the interior baffle of shell body, be equiped with axial blade between described baffle and the shell body inwall, the upper end of described shell body is provided with the fine breeze outlet conduit, described fine breeze outlet conduit is divided into two branch roads, one of them branch road links to each other with pulverized-coal collector by powder storehouse powder feeding pipe and switch valve, and another branch road links to each other with an airduct by switch valve; The grinding machine breeze airflow inlet tube that the lower end of described shell body is provided with the meal backpass ductwork and links to each other with coal pulverizer, the upper end of described shell body are provided with the powder storehouse breeze airflow inlet tube more than that links to each other with the Pulverized Coal Bin port of export.
Be provided with breeze airflow is cushioned and is dispensed to the water conservancy diversion buffer unit of fine breeze outlet conduit under the breeze airflow inlet tube of described powder storehouse.
Described water conservancy diversion buffer unit is one group arc cone, and the fluid of described arc cone imports end towards powder storehouse breeze airflow inlet tube, and the fluid of described arc cone is derived end towards the fine breeze outlet conduit.
The top of described shell body is cylindric, and the bottom of described shell body is coniform, and described powder storehouse breeze airflow inlet tube more than two circumferentially evenly distributes along shell body top circular end face.
The quantity of described powder storehouse breeze airflow inlet tube is identical with the quantity of fine breeze outlet conduit.
Being provided with between described powder storehouse breeze airflow inlet tube and the shell body is inclined upwardly arranges straight length or the circular arc pipeline section of upwards arranging.
Compared with prior art, advantage of the present invention just is: after 1. adopting the present invention, and all the time economic load operation of coal pulverizer, and have best fineness of pulverized coal, thus improved stability and the efficiency of combustion of boiler combustion; 2. when the boiler at low load operating mode is moved, by each pulverized-coal collector of switch valve, the coal dust amount more than needed of coal pulverizer outlet is stored in the Pulverized Coal Bin, thereby can absorbs deposit the more than needed of low speed coal mill and exert oneself; When 3. pulverizer capacity can not satisfy the boiler load requirement, can send into and improve the coal dust amount of sending into boiler in the coal powder injection-type coarse pulverized coal separator being stored in coal dust in the Pulverized Coal Bin, satisfying the burden requirement of boiler, thereby pulverized coal preparation system and boiler have greatly been improved to the adaptive capacity of coal and load; 4. the fault that can be the steel ball coal mill straight blowing type milling system disappears to lack provides the overhaul reserve time, has improved pulverized coal preparation system reliability of operation and flexibility.5. after the powder storehouse is full, can stop part or all of coal pulverizer operation, reduce the powder process power consumption.6. be stored in the Pulverized Coal Bin when different coals is made powder, reach by coal powder injection-type coarse pulverized coal separator and accurately control fast the purpose that Coal rank is mixed burning, stable ignition and burning.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the main TV structure schematic diagram of a kind of mill separator in the embodiment of the invention 1;
Fig. 3 be Fig. 2 overlook the partial structurtes schematic diagram;
Fig. 4 is the main TV structure schematic diagram of another kind of mill separator in the embodiment of the invention 1;
Fig. 5 be Fig. 4 overlook the partial structurtes schematic diagram;
Fig. 6 is that the present invention is the structural representation of embodiment 2.
Marginal data
1, pulverized-coal collector; 2, Pulverized Coal Bin; 3, machine supplying powder; 4, coal, pulverulent fuel mixer; 5, mill exhauster; 6, coal pulverizer; 7, feeder; 8, mill separator; 801, meal backpass ductwork; 802, fine breeze outlet conduit; 803, powder storehouse breeze airflow inlet tube; 804, mill separator top; 805, water conservancy diversion buffer unit; 806, discharge distributes conveyance conduit; 807, baffle; 808, axial blade; 809, shell body; 810, bracing or strutting arrangement; 812, grinding machine breeze airflow inlet tube; 9, airduct; 10, burner; 11, wind wind sector; 12, powder storehouse powder feeding pipe; 13, powder storehouse powder feeding pipe switch valve; 14, blast pipe; 15, blast pipe switch valve; 16, Pulverized Coal Bin flour extraction pipe; 17, Pulverized Coal Bin flour extraction pipe switch valve.
The specific embodiment
Below with reference to specific embodiment and Figure of description the present invention is described in further details.
Embodiment 1: as shown in Figure 1, the present invention is based on the combined type pulverized coal preparation system of coal pulverizer, comprise pulverized-coal collector 1, Pulverized Coal Bin 2, machine supplying powder 3, coal, pulverulent fuel mixer 4, mill exhauster 5, coal pulverizer 6, feeder 7, mill separator 8 and a wind wind sector 11, coal pulverizer 6 adopts double-inlet and double-outlet steel ball coal mill, and the two ends of coal pulverizer 6 are connected with respectively a mill separator 8 and a feeder 7.Feeder 7 links to each other with the entrance point of coal pulverizer 6, the port of export of coal pulverizer 6 links to each other with the arrival end of mill separator 8, the port of export of mill separator 8 is divided into two-way, leading up to three powder storehouse powder feeding pipe 12 and powder storehouse powder feeding pipe switch valve 13 links to each other with pulverized-coal collector 1, and the fine breeze of separating enters into Pulverized Coal Bin 2 behind pulverized-coal collector 1; Another road links to each other with an airduct 9 by switch valve; The weary gas port of export of pulverized-coal collector 1 links to each other with an airduct 9 by blast pipe 14, mill exhauster 5 and blast pipe switch valve 15, and the spout by corresponding burner 10 sprays into burner hearth separately.The port of export of Pulverized Coal Bin 2 links to each other with mill separator 8 after by Pulverized Coal Bin flour extraction pipe 16, machine supplying powder 3, coal, pulverulent fuel mixer 4, Pulverized Coal Bin flour extraction pipe switch valve 17, and a road of mill separator 8 ports of export link to each other with an airduct 9.A wind wind sector 11 is that coal pulverizer 6, mill separator 8 and powder storehouse powder feeding pipe 12 are for a wind.
When boiler moves, if Pulverized Coal Bin 2 interior powder positions are not arrived when the highest, then carry out the storage powder of Pulverized Coal Bin 2 under underload.By control powder storehouse powder feeding pipe switch valve 13, the primary mixture of coal pulverizer 6 one ends sent into through mill separator 8 after pulverized-coal collector 1 separates coal dust is stored in the Pulverized Coal Bin 2.Weary gas in the pulverized-coal collector 1 is sent in the airduct 9 of switch terminal after by mill exhauster 5 adherence pressures, and the spout by burner 10 sprays into burner hearth separately.
When Pulverized Coal Bin 2 was filled, if boiler load is still lower, coal pulverizer 6 can be out of service, opens Pulverized Coal Bin 2 and put powder, by an airduct 9 coal dust sent into burner 10.This moment milling waste steam not processed.
When boiler moved under high load capacity, the electrically operated valve that switches on the pipeline made pulverized-coal collector out of service, and coal pulverizer 6 keeps direct-firing operation, regulates suitable machine supplying powder 3 rotating speeds by the needs of load, and the coal dust of storage in the Pulverized Coal Bin 2 is sent into combustion system.This moment is milling waste steam not processed also.
System in this example is simple and reliable, and it is original direct-firing, substantially constant that the pulverized coal preparation system method of operation keeps.Adopt the pressure air high concentration to carry the coal dust of sending in the machine supplying powder 3, can effectively prevent the obstruction of Pulverized Coal Bin flour extraction pipe 16, an airduct 9, used powder feeding air quantity is very little with respect to primary air flow, can improve wind concentration one time.
Referring to Fig. 2 and Fig. 3, a kind of mill separator 8 of example among the present invention, comprise shell body 809 and be installed in baffle 807 in the shell body 809, the top of shell body 809 is cylindric, the bottom of shell body 809 is coniform, baffle 807 is coniform, and the design of taper is beneficial to carries out water conservancy diversion to breeze airflow.Be equiped with axial blade 808 between baffle 807 and shell body 809 inwalls, axial blade 808 is for adjusting the foliaceous behind the gap, the upper end of shell body 809 is provided with fine breeze outlet conduit 802, this fine breeze outlet conduit 802 is divided into two-way, one the tunnel links to each other with an airduct 9, and another road links to each other with powder storehouse powder feeding pipe 12.The end that fine breeze outlet conduit 802 links to each other with shell body 809 is provided with discharge and distributes conveyance conduit 806.The grinding machine breeze airflow inlet tube 812 that the lower end of shell body 809 is provided with meal backpass ductwork 801 and links to each other with coal pulverizer 6, the coal dust of coal pulverizer 6 outputs enters the bottom of shell body 809 through grinding machine breeze airflow inlet tube 812 under the blowing of air-flow, breeze airflow comes separated through meal after the axial blade 808 and fine powder, underproof meal will fall into meal backpass ductwork 801 and be imported into coal pulverizer 6 continuation grindings, and qualified fine breeze delivers in the coal burner of boiler from fine breeze outlet conduit 802 with drier.The upper end of the present invention China and foreign countries housing 809 is provided with the powder storehouse breeze airflow inlet tube 803 more than that links to each other with Pulverized Coal Bin 2, and this powder storehouse breeze airflow inlet tube 803 is communicated with Pulverized Coal Bin flour extraction pipe 16.Adopt a powder storehouse breeze airflow inlet tube 803 that is positioned at shell body 809 middle parts in the present embodiment.The coal dust that is stored in the Pulverized Coal Bin 2 can be passed in the shell body 809 by powder storehouse breeze airflow inlet tube 803, and enter in the fine breeze outlet conduit 802 after in shell body 809, finishing buffering and distribution, be delivered in the burner 10 of boiler finally by an airduct 9.
In the present embodiment, be provided with breeze airflow is cushioned and is dispensed to the water conservancy diversion buffer unit 805 of fine breeze outlet conduit 802 under the powder storehouse breeze airflow inlet tube 803.Water conservancy diversion buffer unit 805 is one group of arc cone, and the fluid of arc cone imports end towards powder storehouse breeze airflow inlet tube 803, and the fluid of arc cone is derived end towards fine breeze outlet conduit 802.Water conservancy diversion buffer unit 805 is supported on the baffle 807 by bracing or strutting arrangement 810.Water conservancy diversion buffer unit 805 can also adopt the various structures patterns such as arc cone-plate, pot type cone, cone, its support can be adopted round steel, band steel and 809 of shell bodies horizontal be connected or inner cone between vertical (or vertical) connection.
Referring to Fig. 4 and Fig. 5, mill separator 8 for the another kind of example of the present invention, its structure difference is: adopt the powder storehouse breeze airflow inlet tube 803 more than two, and each powder storehouse breeze airflow inlet tube 803 circumferentially evenly distributing along shell body 809 top circular end faces.Also can be further the quantity of powder storehouse breeze airflow inlet tube 803 and the quantity of fine breeze outlet conduit 802 are designed to identical, to guarantee the uniformity of breeze airflow.When adopting 803 design of many powder storehouse breeze airflow inlet tubes, can also when 803 access of powder storehouse breeze airflow inlet tube, adopt the circular arc pipeline section that is inclined upwardly the certain angle straight length or makes progress, to reduce the flow resistance of breeze airflow, improve the uniformity that fine breeze distributes between each coal dust output channel.Mill separator for this circumferential multiple entry type, fine breeze air-flow from Pulverized Coal Bin 2 enters the space on mill separator top 804 from the circumferential equally distributed porch of shell body 809 top cylinder body straight sections from many pipelines, then distribute conveyance conduit 806 to enter in the fine breeze outlet conduit 802 through discharge, and then be admitted in the boiler and burn.Obviously, under this kind operating mode, mill separator 8 plays a part a kind of coal dust fully to be mixed and distributor.
Embodiment 2: as shown in Figure 6, the present invention is based on the combined type pulverized coal preparation system of coal pulverizer, comprise pulverized-coal collector 1, Pulverized Coal Bin 2, machine supplying powder 3, coal, pulverulent fuel mixer 4, mill exhauster 5, coal pulverizer 6, feeder 7, mill separator 8 and a wind wind sector 11, coal pulverizer 6 adopts double-inlet and double-outlet steel ball coal mill, and the two ends of coal pulverizer 6 are connected with respectively a mill separator 8 and a feeder 7.Feeder 7 links to each other with the entrance point of coal pulverizer 6, the port of export of coal pulverizer 6 links to each other with the arrival end of mill separator 8, the port of export of mill separator 8 is divided into two-way, leading up to three powder storehouse powder feeding pipe 12 and powder storehouse powder feeding pipe switch valve 13 links to each other with pulverized-coal collector 1, and the fine breeze of separating enters into Pulverized Coal Bin 2 behind pulverized-coal collector 1; Another road links to each other with an airduct 9 by switch valve; The weary gas port of export of pulverized-coal collector 1 links to each other with an airduct 9 by blast pipe 14, mill exhauster 5 and blast pipe switch valve 15, and the spout by corresponding burner 10 sprays into burner hearth separately.The port of export of Pulverized Coal Bin 2 passes through to link to each other with mill separator 8 behind Pulverized Coal Bin flour extraction pipe 16, machine supplying powder 3, the coal, pulverulent fuel mixer 4, and the port of export of Pulverized Coal Bin 2 directly links to each other with an airduct 9 by powder feeding pipe, machine supplying powder 3 and coal, pulverulent fuel mixer 4.A wind wind sector 11 is that coal pulverizer 6, mill separator 8 and powder storehouse powder feeding pipe 12 are for a wind.
In the scheme of this example, system can the warehouse formula and direct-firing between switch, flexibility is high.When coal dust reached the highest powder position in the Pulverized Coal Bin 2, coal pulverizer 6 was fully out of service, and system moves by warehouse formula mode.Like this, can guarantee that coal pulverizer 6 is all the time in most economical operating mode operation.During high load capacity, move by direct-firing mode, and the powder of depositing in the Pulverized Coal Bin 2 is sent in airduct 9 by machine supplying powder 3, to satisfy the needs of load.System flow is simple under the high load capacity, and resistance is little, and operating cost also reduces.During underload, can make the sub-load (or certain end of a coal pulverizer 6) of coal pulverizer 6 change the process of separating and storing coal dust over to.
Below only be preferred embodiment of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art, in the some improvements and modifications that do not break away under the principle of the invention prerequisite, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. combined type pulverized coal preparation system based on coal pulverizer, it is characterized in that: comprise pulverized-coal collector (1), Pulverized Coal Bin (2), machine supplying powder (3), coal, pulverulent fuel mixer (4), mill exhauster (5), coal pulverizer (6), feeder (7), mill separator (8) and a wind wind sector (11), described feeder (7) links to each other with the entrance point of coal pulverizer (6), the port of export of described coal pulverizer (6) links to each other with the arrival end of mill separator (8), the port of export of described mill separator (8) is divided into two-way, leading up to powder storehouse powder feeding pipe (12) and switch valve links to each other with pulverized-coal collector (1), and another road links to each other with an airduct (9) by switch valve; The weary gas port of export of described pulverized-coal collector (1) links to each other with an airduct (9) by blast pipe (14), mill exhauster (5) and switch valve, the flour extraction end of described pulverized-coal collector (1) links to each other with the arrival end of Pulverized Coal Bin (2), and the port of export of described Pulverized Coal Bin (2) links to each other with an airduct (9) by powder feeding pipe, machine supplying powder (3) and coal, pulverulent fuel mixer (4); The port of export of described Pulverized Coal Bin (2) passes through to link to each other with mill separator (8) behind powder feeding pipe, machine supplying powder (3), the coal, pulverulent fuel mixer (4), and the port of export of described mill separator (8) links to each other with an airduct (9).
2. the combined type pulverized coal preparation system based on coal pulverizer according to claim 1, it is characterized in that: described mill separator (8) comprises shell body (809) and is installed in the interior baffle (807) of shell body (809), be equiped with axial blade (808) between described baffle (807) and shell body (809) inwall, the upper end of described shell body (809) is provided with fine breeze outlet conduit (802), described fine breeze outlet conduit (802) has two branch roads, one of them branch road links to each other with pulverized-coal collector (1) by powder storehouse powder feeding pipe (12) and switch valve, and another branch road links to each other with an airduct (9) by switch valve; The grinding machine breeze airflow inlet tube (812) that the lower end of described shell body (809) is provided with meal backpass ductwork (801) and links to each other with coal pulverizer (6), the upper end of described shell body (809) are provided with the powder storehouse breeze airflow inlet tube (803) more than that links to each other with Pulverized Coal Bin (2) port of export.
3. the combined type pulverized coal preparation system based on coal pulverizer according to claim 2 is characterized in that: the water conservancy diversion buffer unit (805) that is provided with breeze airflow is cushioned and is dispensed to fine breeze outlet conduit (802) under the described powder storehouse breeze airflow inlet tube (803).
4. the combined type pulverized coal preparation system based on coal pulverizer according to claim 3, it is characterized in that: described water conservancy diversion buffer unit (805) is one group of arc cone, the fluid of described arc cone imports end towards powder storehouse breeze airflow inlet tube (803), and the fluid of described arc cone is derived end towards fine breeze outlet conduit (802).
5. the combined type pulverized coal preparation system based on coal pulverizer according to claim 2, it is characterized in that: the top of described shell body (809) is cylindric, the bottom of described shell body (809) is coniform, described powder storehouse breeze airflow inlet tube (803) is more than two, and described powder storehouse breeze airflow inlet tube (803) more than two circumferentially evenly distributes along shell body (809) top circular end face.
6. the combined type pulverized coal preparation system based on coal pulverizer according to claim 5, it is characterized in that: the quantity of described powder storehouse breeze airflow inlet tube (803) is identical with the quantity of fine breeze outlet conduit (802).
7. the combined type pulverized coal preparation system based on coal pulverizer according to claim 5 is characterized in that: the straight length that being provided with between described powder storehouse breeze airflow inlet tube (803) and the shell body (809) is inclined upwardly arranges or the circular arc pipeline section of upwards arranging.
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| CN 201019060024 CN102189024B (en) | 2010-03-01 | 2010-03-01 | Compound pulverizing system based on coal pulverizer |
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| CN 201019060024 CN102189024B (en) | 2010-03-01 | 2010-03-01 | Compound pulverizing system based on coal pulverizer |
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| CN102189024B true CN102189024B (en) | 2013-03-06 |
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| CN103537355B (en) * | 2013-10-11 | 2015-06-17 | 陕煤集团神木张家峁矿业有限公司 | System and method for preparing ultrafine pulverized coal |
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| CN113617471A (en) * | 2021-08-04 | 2021-11-09 | 苏州西热节能环保技术有限公司 | System capable of reducing cold air volume of steel ball coal mill |
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