CN101761933A - Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system - Google Patents
Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system Download PDFInfo
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Abstract
The invention relates to a low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system. A middle bin storage type steel ball coal mill hot air power feeding and meagre coal power preparation system is adopted as a prototype, and part of low-temperature furnace smoke is sucked from an outlet of a suction fan by a furnace smoke fan as an inert medium and part of drying mediums to be mixed with hot air taken from an outlet of an air preheater to enter a coal mill for drying and delivering coal powder; the oxygen content of the powder preparation system is reduced, and the explosion preventing requirement on grinding bituminous coal can be met. In addition, part of exhaust gas at an outlet of a power exhauster is led to an inlet of a heat primary fan by an exhaust gas transfer pipeline to be mixed with hot air to enter a primary bellows for delivering the coal powder; the temperature of a primary air and powder mixture and the oxygen concentration of the system are effectively reduced, and the combustion and explosion preventing requirement of bituminous coal delivery is met. Isolating doors are both installed on a furnace smoke system and an exhaust gas transfer system; by the switch control of the isolating doors, the switching of a typical hot air power feeding meagre coal system and a low-temperature furnace smoke exhaust gas and hot air drying composite powder feeding bituminous coal system is realized, and the invention is not only suitable for the meagre coal, but also suitable for the bituminous coal.
Description
Technical field
The invention belongs to generating plant pulverized coal boiler pulverized coal preparation system field, be specifically related to the dry weary gas and hot air composite powder feeding bituminous coal meager coal general type pulverized coal preparation system of a kind of low-temperature furnace smoke sucking.
Background technology
Pulverized coal preparation system is the important component part of generating plant pulverized coal boiler combustion system, and it mainly acts on is pulverized coal preparation and conveying, for boiler provides the coal dust of qualified fineness and the wind powder mixture of suitable temperature (being commonly referred to wind one time).Pulverized-coal fired boiler based on fuel different in kind can be divided into meager coal boiler and bituminous coal fired boiler, carries out the pulverized coal preparation system type selecting according to the design coal difference, and common a kind of pulverized coal preparation system is only applicable to a kind of coal of character.Warehouse formula low speed coal mill system is reliable in the middle of conventional, the coal adaptive capacity is stronger, both can grind meager coal, also can grind bituminous coal, the meager coal boiler is selected the higher pulverized coal carried by hot air mode of primary wind and powder mixture temperature usually, and bituminous coal fired boiler is generally selected the lower transporting pulverized coal with exhaust gas mode of primary wind and powder mixture temperature; Automatic powder feeding system is in a single day selected, can only be applicable to a kind of coal of character, and single meager coal or single bituminous coal can't be taken into account, and coal accommodation is very limited.Below to two kinds of pulverized coal carried by hot air and transporting pulverized coal with exhaust gas main in the middle of warehouse low speed coal mill system simply introduce.
Centre warehouse formula low speed coal mill system is made up of capital equipments such as feeder, coal pulverizer, mill separator, pulverized-coal collector, mill exhauster, Pulverized Coal Bin, machine supplying powders.Raw coal transports by coal conveyer belt from coal yard and enters the run coal bin storage, quantitatively falls into coal pulverizer according to the operation needs by regulating feeder.Pumped (conveying) medium generally is made up of the cold wind mixing of the hot blast of taking from the air preheater outlet and pressure fan outlet, feeds the effect that coal pulverizer plays dry and pulverized coal conveying.Finish the separation of wind powder through mill separator, pulverized-coal collector successively by the wind powder mixture that coal pulverizer comes out, most of coal dust falls into Pulverized Coal Bin after separating, and the weary gas wind that carries a small amount of fine breeze enters the blast pipe road through mill exhauster.
A) pulverized coal carried by hot air mode
Come out to carry the weary gas of a small amount of coal dust by mill exhauster and directly send into the burner hearth burning by weary gas blowout mouth, the coal dust in the Pulverized Coal Bin falls into air and powder mixer through machine supplying powder, mixes with heat primary air by burner to spray into the burner hearth burning.
B) transporting pulverized coal with exhaust gas mode
Qualified coal dust in the Pulverized Coal Bin falls into air and powder mixer through machine supplying powder, mixes with weary gas that mill exhauster comes out by burner to spray into the burner hearth burning.
No matter be pulverized coal carried by hot air mode or transporting pulverized coal with exhaust gas mode, all can only adapt to grinding and carrying of meager coal or bituminous coal, can not take into account.Change under the situation complicated, that the coal price fluctuation is frequent in current coal market, the price of bituminous coal and meager coal often has big gap, and back and forth fluctuation, instability, this pulverized coal preparation system that is only applicable to single coal has influenced the fire coal buying economy of power plant to a great extent.
Summary of the invention
The object of the present invention is to provide and a kind ofly can adapt to the dry weary gas and hot air composite powder feeding bituminous coal meager coal general type pulverized coal preparation system of low-temperature furnace smoke sucking that meager coal can adapt to bituminous coal again, the present invention has widened boiler coal accommodation, reduce the fuel purchase cost, improve economy of power plant.
For achieving the above object, the technical solution used in the present invention is: comprise feeder and the coal pulverizer that is connected with the coal outlet of feeder, the outlet of coal pulverizer through the coal dust pipeline successively with mill separator, pulverized-coal collector is connected, the outlet of pulverized-coal collector is divided into air pipe line and coal dust pipeline two parts, the coal dust pipeline of pulverized-coal collector is through Pulverized Coal Bin, machine supplying powder is connected with boiler-burner, pressure fan outlet cool air hose is divided into two-way, one the tunnel is connected with coal pulverizer inlet, another road is divided into three road hot blasts after the air preheater heating, one the tunnel is connected with coal pulverizer inlet, one the tunnel is connected with the inlet of machine supplying powder through the heat primary air machine, another road is connected with the inlet of boiler-burner, the air pipe line of pulverized-coal collector is divided into two-way behind Powder discharging fan, one the tunnel directly enters burner hearth through the weary gas blowout mouth of boiler, the weary gas transfer pipeline of another route is connected with heat primary air machine inlet through isolated door, boiler tail flue gas becomes low-temperature furnace smoke after entering the air preheater heat exchange, stove smoke pipe road is divided into two-way behind induced-draught fan, one the tunnel directly enters atmosphere, another Lu Jinglu cigarette blower fan through chimney, isolated door is connected with the coal pulverizer inlet.
With the powder process of middle warehouse formula low speed coal mill pulverized coal carried by hot air meager coal is prototype, extract the part low-temperature furnace smoke as inert media and part drying medium from the induced-draught fan outlet by stove cigarette blower fan, be mixed into coal pulverizer drying and pulverized coal conveying with the hot blast of taking from the air preheater outlet, greatly reduce the oxygen content of pulverized coal preparation system, can satisfy the requirement of explosion proof that grinds bituminous coal.In addition, the weary gas wind of mill exhauster exit portion is moved pipeline through weary cyclostrophic cause heat primary air machine inlet, be mixed into the bellows pulverized coal conveying No. one time with hot blast, effectively reduce primary wind and powder mixture temperature and system's oxygen concentration, satisfied the burn-proof and explosion prevention requirement that bituminous coal is carried.Stove cigarette system that increases newly and weary cyclostrophic move and all are equiped with isolated door in the system, can thoroughly isolate with original system, revert to typical pulverized coal carried by hot air meager coal system when isolated door is closed; When isolated door is opened, when stove cigarette system and weary cyclostrophic move system and come into operation, become the dry weary gas and hot air composite powder feeding bituminous coal system of low-temperature furnace smoke.So this pulverized coal preparation system can adapt to meager coal and adapt to bituminous coal again, and can be in operation, enlarge boiler coal accommodation greatly by convenient switching of simple isolated door operation realization.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, the coal pulverizer 6 that the present invention includes feeder 5 and be connected with the coal outlet of feeder 5, the outlet of coal pulverizer 6 through the coal dust pipeline successively with mill separator 7, pulverized-coal collector 8 is connected, and another outlet of mill separator 7 also is connected with the inlet of coal pulverizer 6, the outlet of pulverized-coal collector 8 is divided into air pipe line and coal dust pipeline two parts, the coal dust pipeline of pulverized-coal collector 8 is through Pulverized Coal Bin 9, machine supplying powder 10 is connected with boiler-burner 14, pressure fan 3 outlet cool air hoses are divided into two-way, one the tunnel is connected with coal pulverizer 6 inlet, another road is divided into three road hot blasts after air preheater 2 heating, one the tunnel is connected with coal pulverizer 6 inlet, one the tunnel is connected through the inlet of heat primary air machine 12 with machine supplying powder 10, another road is connected with the inlet of boiler-burner 14, the air pipe line of pulverized-coal collector 8 is divided into two-way behind Powder discharging fan 11, one the tunnel directly enters burner hearth through the weary gas blowout mouth 13 of boiler, the weary gas transfer pipeline 15 of another route is connected with heat primary air machine 12 inlets through isolated door 18, boiler 1 tail flue gas becomes low-temperature furnace smoke after entering air preheater 2 heat exchange, stove smoke pipe road is divided into two-way behind induced-draught fan 4, one the tunnel directly enters atmosphere, another Lu Jinglu cigarette blower fan 16 through chimney, isolated door 17 is connected with coal pulverizer 6 inlets.
The present invention is warehouse formula low speed coal mill pulverized coal carried by hot air meager coal system and transporting pulverized coal with exhaust gas bituminous coal system fully realizing on the basis of characteristics separately in the middle of to the typical case,, design to adapt to grinding and carrying of bituminous coal explosion-proof strict demand in conjunction with powdering system of bituminous coal by improvement to pulverized coal carried by hot air meager coal system.
1, widened boiler coal accommodation
Limited by pulverized coal preparation system, general meager coal boiler can't use the higher bituminous coal of volatile matter, mainly is subject to the anti-explosion safety of pulverized coal preparation system, when mixing a certain proportion of bituminous coal of burning, need mix a large amount of cold wind in order to reduce the coal pulverizer outlet temperature, influence boiler thermal output greatly.And induced-draught fan outlet of the present invention is extracted the part low-temperature furnace smoke as inert media and part drying medium by stove cigarette blower fan, is mixed into coal pulverizer with the hot blast of taking from the air preheater outlet, has reduced the oxygen content of system, to adapt to the needs that grind bituminous coal.In addition, the weary gas of mill exhauster exit portion is moved pipeline through weary cyclostrophic cause heat primary air machine inlet, be mixed into the bellows pulverized coal conveying No. one time, effectively reduce primary wind and powder mixing temperature and oxygen concentration simultaneously, prevent the spontaneous combustion and the blast of pulverized coal feed pipe with hot blast.Under the prerequisite that does not reduce boiler efficiency, pulverized coal preparation system not only is applicable to meager coal but also be applicable to bituminous coal, and can freely select, switch flexibly by between.Make boiler have very strong coal adaptability, estimate to go for the volatile matter height to V
Daf=40% bituminous coal.
2, system switches simple, flexible
The present invention has increased the low-temperature furnace smoke system in the warehouse formula pulverized coal carried by hot air meager coal system and weary cyclostrophic moves system in the middle of former typical steel ball milling, the system reform is simple relatively, and in newly-increased system, installed isolated door, only the switch by isolated door just can switch between meager coal and bituminous coal system flexibly.
3, reduce the NOx discharge capacity
The present invention is when realizing grinding bituminous coal, after extraction part low-temperature furnace smoke enters the dry coal dust of coal pulverizer, move system through weary cyclostrophic and enter primary air system, reduced the wind oxygen content one time, make that the burner flame central temperature reduces, reducing atmosphere strengthens, the air classification heighten degree, effectively suppressed the generation of NOx.So the present invention helps reducing boiler NOx discharging.
4, be applicable to that meager coal changes the boiler improvement project of bituminous coal
Be subjected to the influence of coal market, generating is with meager coal coal source instability, and is in short supply often, and price is higher, and some meager coal unit boiler need change burning bituminous coal.Advantages such as utilization the present invention has small investment, instant effect, and system reform quantities is little, reliable, and can be when some is specific, when the meager coal price is hanged down, switch back the former meager coal method of operation, many standby operation modes, the market adaptability is stronger.
Claims (1)
1. the low-temperature furnace smoke sucking drying lacks gas and hot air composite powder feeding bituminous coal meager coal general type pulverized coal preparation system, comprise feeder (5) and the coal pulverizer (6) that is connected with the coal outlet of feeder (5), the outlet of coal pulverizer (6) through the coal dust pipeline successively with mill separator (7), pulverized-coal collector (8) is connected, the outlet of pulverized-coal collector (8) is divided into air pipe line and coal dust pipeline two parts, the coal dust pipeline of pulverized-coal collector (8) is through Pulverized Coal Bin (9), machine supplying powder (10) is connected with boiler-burner (14), pressure fan (3) outlet cool air hose is divided into two-way, one the tunnel is connected with coal pulverizer (6) inlet, another road is divided into three road hot blasts after air preheater (2) heating, one the tunnel is connected with coal pulverizer (6) inlet, one the tunnel is connected through the inlet of heat primary air machine (12) with machine supplying powder (10), another road is connected with the inlet of boiler-burner (14), it is characterized in that: the air pipe line of pulverized-coal collector (8) is divided into two-way behind Powder discharging fan (11), one the tunnel directly enters burner hearth through the weary gas blowout mouth (13) of boiler, the weary gas transfer pipeline (15) of another route is connected with heat primary air machine (12) inlet through isolated door (18), boiler (1) tail flue gas becomes low-temperature furnace smoke after entering air preheater (2) heat exchange, stove smoke pipe road is divided into two-way behind induced-draught fan (4), one the tunnel directly enters atmosphere, another Lu Jinglu cigarette blower fan (16) through chimney, isolated door (17) is connected with coal pulverizer (6) inlet.
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