CN206918990U - Normal-pressure boiler secondary dedusting system - Google Patents

Abstract

A kind of normal-pressure boiler secondary dedusting system, including a secondary furnace being arranged in boiler body, the cyclone dust removal unit being arranged on outside boiler body, water film dedusting unit；Flow direction of the coal-fired flue-gas passage along heat smoke is divided into coal-fired flue-gas entrance, the first Vertical Channel, horizontal channel, the second Vertical Channel, coal-fired flue-gas outlet；This practicality is newly by setting secondary furnace, in the first Vertical Channel, horizontal channel, the second Vertical Channel of the tortuous trend of after-flame indoor design U-shaped, by coal-fired fully burning, coal-fired flue-gas passage is also equivalent to the effect of cyclone dust removal simultaneously, a part of coal dust is separated with flue gas, so that it burns away in secondary furnace, both reduce the dust harzard in flue gas, while also give full play to the heat energy utilization of fire coal；Coal dust in flue gas is separated to greatest extent with the water tank of inner division plate using cyclone dust collectors, the limewash in water tank separates out the sulfur in flue gas；Meet air environmental requirement by the fume emission of the secondary dedusting system.

Description

Normal-pressure boiler secondary dedusting system

Technical field

Boiler dust removal equipment technical field is the utility model is related to, more particularly to a kind of normal-pressure boiler secondary dedusting system.

Background technology

The problem of coal-burning boiler is primarily present is that smoke medicining dust-removing effect is poor, due to no clean-burning coal dust be present, from The often billowing black smoke of flue gas of chimney discharge, the dust in black smoke are generally divided into two classes, and one kind is the carbon black of particle very little, Granularity is about one micron, and this is due to incomplete combustion and formed that another kind of is the flying dust carried secretly in flue gas, including do not burn Coal grain, granularity is more than 1 micron.

Coal dust in coal-fired flue-gas, which fully burns, need to meet three conditions；First, flue gas has to pass through a high-temperature region；Its Two, flue gas will have sufficiently high speed to reach necessary turbulence when passing through high-temperature region, make unburned gas fully and empty with particle Gas contacts;Third, there is the air capacity needed for burning.

The more dust just for flue portion of conventional smoke prevention, dust collecting, take single Gravity Separation, dedusting effect Fruit is poor, and the sulfur in flue gas is directly discharged into air more, is polluted；Erosion caused by sulfur also results in the damage of business equipment It is bad；Flue gas caused by boiler is far from reaching national requirements for environmental protection.

The content of the invention

In view of this, in view of the above-mentioned problems, being necessary to provide a kind of black smoke and sulfur that can be eliminated in coal-fired flue-gas, and remove The normal-pressure boiler secondary dedusting system of dirt efficiency high.

A kind of normal-pressure boiler secondary dedusting system, including one be arranged in boiler body, and with the burning of boiler body The secondary furnace of room connection, cyclone dust removal unit, the water film dedusting unit being arranged on outside boiler body；The secondary furnace is a combustion Flue-gas passage, flow direction of the coal-fired flue-gas passage along heat smoke are divided into coal-fired flue-gas entrance, the first Vertical Channel, level Passage, the second Vertical Channel, coal-fired flue-gas outlet；Coal-fired flue-gas entrance and combustion chamber mouth everywhere in the top of combustion chamber, Coal-fired flue-gas is produced from combustion chamber, and the first Vertical Channel of secondary furnace, first Vertical Channel are flowed into from coal-fired flue-gas entrance Bottom and one end of horizontal channel connect, the other end of horizontal channel is connected with the bottom of the second Vertical Channel, described second The top of Vertical Channel exports for coal-fired flue-gas；The horizontal channel is set less than coal-fired flue-gas entrance and coal-fired flue-gas outlet, So that coal-fired flue-gas forms the tortuous trend of U-shaped in secondary furnace；The cyclone dust removal unit includes cyclone dust collectors, air-introduced machine； The air inlet of the cyclone dust collectors and above-mentioned coal-fired flue-gas outlet, the exhaust outlets of the cyclone dust collectors and air-introduced machine Air inlet connects；The water film dedusting unit includes the water tank of an inner division plate, and a side of the water tank is provided with one The air admission hole connected with air-introduced machine exhaust outlet, a steam vent, air admission hole of the dividing plate towards water tank are provided with the top of water tank It is fixed in water tank, and relative air admission hole is obliquely installed, and the coal-fired flue-gas entered from water tank air admission hole is changed into Xiang Shui Case flows；For water tank built with limewash, the water surface of limewash is less than the bottom of dividing plate.

Preferably, the cross-sectional area of first Vertical Channel expands along coal-fired flue-gas flow direction, so that into The coal-fired flue-gas of first Vertical Channel is into turbulent flow.

Preferably, the snakelike cooling coil of flow media can be added by being provided with second Vertical Channel, to reduce combustion The temperature of flue-gas.

Preferably, the normal-pressure boiler secondary dedusting system also includes economizer, has one inside the economizer for combustion The U-shaped flue of flue-gas circulation, the inwall of the U-shaped flue is provided with the interlayer for flow media circulation, so that the stream in interlayer Dynamic medium carries out heat exchange with entering the coal-fired flue-gas of U-shaped flue, and the both ends open of the U-shaped flue is respectively entering for economizer Gas port and exhaust outlet, air inlet and the coal-fired flue-gas outlet of the economizer, the exhaust outlet and air-introduced machine of the economizer Air inlet connection.

Preferably, the normal-pressure boiler secondary dedusting system also sets up the first direct exhaust chimney of a controllable conduction, described First direct exhaust chimney is arranged at combustion chamber or the top of secondary furnace, and combustion chamber or secondary furnace are in communication with the outside, and described first Direct exhaust chimney is vertically arranged.

Preferably, the water film dedusting unit is additionally provided with the second direct exhaust chimney, the air inlet of second direct exhaust chimney It is connected with the steam vent of water tank, water tank cavity is in communication with the outside, second direct exhaust chimney is vertically arranged.

Newly by setting secondary furnace, the first Vertical Channel, level in the tortuous trend of after-flame indoor design U-shaped are logical for this practicality Road, the second Vertical Channel, fully burnt coal-fired, while coal-fired flue-gas passage is also equivalent to the effect of cyclone dust removal, by one Divide coal dust to be separated with flue gas, so that it burns away in secondary furnace, both reduce the dust harzard in flue gas, while also fully send out Wave the heat energy utilization of fire coal；Coal dust in flue gas is divided to greatest extent using the water tank of cyclone dust collectors and inner division plate From the limewash in water tank separates out the sulfur in flue gas；Meet air environmental protection by the fume emission of the secondary dedusting system It is required that.

Brief description of the drawings

Fig. 1 is the structural representation of the normal-pressure boiler secondary dedusting system.

Fig. 2 is the water film dedusting cellular construction schematic diagram.

Fig. 3 is the coal economizer structure schematic diagram.

In figure：Secondary furnace 10, coal-fired flue-gas entrance 11, the first Vertical Channel 12, horizontal channel 13, the second Vertical Channel 14th, coal-fired flue-gas outlet 15, cyclone dust removal unit 20, cyclone dust collectors 21, air-introduced machine 22, water film dedusting unit 30, water tank 31, Dividing plate 32, limewash 33, the second direct exhaust chimney 34, snakelike cooling coil 40, economizer 50, U-shaped flue 51, interlayer 52, air inlet Mouth 53, exhaust outlet 54, the first direct exhaust chimney 60, combustion chamber 100.

Embodiment

, below will be to required use in embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the utility model, for this For the those of ordinary skill of field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other Accompanying drawing.

Referring to Fig. 1 and Fig. 2, the utility model embodiment provides a kind of normal-pressure boiler secondary dedusting system, including one It is arranged in boiler body, and secondary furnace 10, the whirlwind that is arranged on outside boiler body connected with the combustion chamber 100 of boiler body Dust removing units 20, water film dedusting unit 30；Secondary furnace 10 is a coal-fired flue-gas passage, and coal-fired flue-gas passage is along heat smoke Flow direction is divided into coal-fired flue-gas entrance 11, the first Vertical Channel 12, horizontal channel 13, the second Vertical Channel 14, coal-fired flue-gas outlet 15；Coal-fired flue-gas entrance 11 produces in the top of combustion chamber 100, coal-fired flue-gas from combustion chamber 100 everywhere with the connected entrance of combustion chamber 100 It is raw, the first Vertical Channel 12 of secondary furnace 10 is flowed into from coal-fired flue-gas entrance 11, the bottom of the first Vertical Channel 12 leads to level One end connection in road 13, the other end of horizontal channel 13 are connected with the bottom of the second Vertical Channel 14, the second Vertical Channel 14 Top is coal-fired flue-gas outlet 15；Horizontal channel 13 is set less than coal-fired flue-gas entrance 11 and coal-fired flue-gas outlet 15, so that combustion Flue-gas forms the tortuous trend of U-shaped in secondary furnace 10；Cyclone dust removal unit 20 includes cyclone dust collectors 21, air-introduced machine 22；Rotation The air inlet of wind deduster 21 connects with above-mentioned coal-fired flue-gas outlet 15, the exhaust outlet of cyclone dust collectors 21 and entering for air-introduced machine 22 Gas port connects；Water film dedusting unit 30 includes the water tank 31 of inner division plate 32, a side of water tank 31 be provided with one with The air admission hole of the exhaust outlet of air-introduced machine 22 connection, the top of water tank 31 is provided with a steam vent, air inlet of the dividing plate 32 towards water tank 31 Hole is fixed in water tank 31, and relative air admission hole is obliquely installed, and the coal-fired flue-gas entered from the air admission hole of water tank 31 is changed For to the flows of water tank 31；For water tank 31 built with limewash 33, the water surface of limewash 33 is less than the bottom of dividing plate 32.

In the present embodiment, secondary furnace 10 can be both built in boiler body, can also be external；Coal-fired flue-gas passage The time of fired coal combustion is increased, reduces and not yet has enough time burning, or has just burnt the outer row of red fine grained flue gas；Referring to figure The flow direction P of flue gas in 1, secondary furnace 10 connect air-introduced machine 22, and negtive pressure forced caused by air-introduced machine 22 is by combustion chamber 100 Flue gas is extracted out by the first Vertical Channel 12, horizontal channel 13, the second Vertical Channel 14, the first Vertical Channel 12, horizontal channel 13 and second Vertical Channel 14 form the tortuous trend of U-shaped, the component effect of coal dust gravity direction during moving downward is heavy Accumulate the outer row in the bottom surface of horizontal channel 13, further reducing fine grained flue gas；Flue gas continues with certain speed entrance Cyclone dust collectors 21, wherein, cyclone dust collectors 21 can be centrifugal cyclone deduster；The coal dust in flue gas is divided again through centrifugal action Separate out about 60% or so, remainder grit, which continues on through air-introduced machine 22 and aspirates the water film dedusting sulphur removal being admitted to below with flue gas, to be filled Put, change flow direction blows to the water surface of limewash 33 after washing away dividing plate 32, and remaining grit is adsorbed by the water surface and separated with flue gas, meanwhile, cigarette Sulfur in gas occurs chemical action with limewash 33 and is also precipitated；Dust-laden sulfur-containing smoke gas passes through secondary dedusting system, its index The discharge standard of air environmental requirement is reached.

This practicality newly by setting secondary furnace 10, in the secondary furnace 10 first Vertical Channel 12 of the tortuous trend of design U-shaped, Horizontal channel 13, the second Vertical Channel 14, by coal-fired fully burning, while coal-fired flue-gas passage is also equivalent to the work of cyclone dust removal With, a part of coal dust is separated with flue gas, so that it burns away in secondary furnace 10, has both reduced the dust harzard in flue gas, The heat energy utilization of fire coal is also given full play to simultaneously；Using the water tank 31 of cyclone dust collectors 21 and inner division plate 32 by coal dust in flue gas Separated to greatest extent, the limewash 33 in water tank 31 separates out the sulfur in flue gas；By the secondary dedusting system Fume emission meets air environmental requirement.

Referring to Fig. 1, further, the cross-sectional area of the first Vertical Channel 12 expands along coal-fired flue-gas flow direction, with Make coal-fired flue-gas into the first Vertical Channel 12 into turbulent flow.

In the present embodiment, due to the cross-sectional area of the first Vertical Channel 12 expand, coal dust flow velocity reduce, coal dust due to The effect of self gravitation is deposited on the bottom of horizontal channel 13, certain horizontal channel 13, the cross section face of the second Vertical Channel 14 Product is also designed to expand along coal-fired flue-gas flow direction；According to hydrodynamics, the cross-sectional area of the first Vertical Channel 12 expands Into turbulent flow, the coal dust in such flue gas can be mixed more fully the big flue gas for promoting to flow through with flue gas, is advantageous to not yet Have enough time burning, or just burnt red fine grained coal dust and fully burnt totally.

Referring to Fig. 1, further, the snakelike cooling coil 40 that can add flow media is provided with the second Vertical Channel 14, To reduce the temperature of coal-fired flue-gas.

The above-mentioned flue-gas temperature from the outflow of secondary furnace 10 is very high, passes through and sets snakelike cooler pan in the second Vertical Channel 14 Pipe 40 is by heat recovery and utilization or other heat exchangers；Flue-gas temperature is reduced simultaneously, to protect rear class electromechanical equipment It is safe for operation；For example, high-temperature flue gas is directly entered blower fan for a long time, causes draught fan impeller and axle etc. to deform, destroy dynamic balancing, wind Machine strenuous vibration under high speed rotational case, off-axis occurs and splits shell.

Referring to Fig. 3, further, normal-pressure boiler secondary dedusting system also includes economizer 50, has one inside economizer 50 For the U-shaped flue 51 of coal-fired flue-gas circulation, the inwall of U-shaped flue 51 is provided with the interlayer 52 for flow media circulation, so that interlayer Flow media in 52 carries out heat exchange with entering the coal-fired flue-gas of U-shaped flue 51, and the both ends open of U-shaped flue 51 is respectively to save The air inlet 53 and exhaust outlet 54 of coal device 50, the air inlet 53 of economizer 50 connect with coal-fired flue-gas outlet 15, economizer 50 Exhaust outlet 54 connects with the air inlet of air-introduced machine 22.

In the present embodiment, economizer 50 has the function that common that economizer 50 is more with above-mentioned snakelike cooling coil 40 The recycling for the waste heat being suitable in the relatively low flue gas of temperature, flue-gas temperature is also further reduced to protect rear class equipment.

Referring to Fig. 1, further, normal-pressure boiler secondary dedusting system also sets up the first direct exhaust chimney of a controllable conduction 60, the first direct exhaust chimney 60 is arranged at combustion chamber 100 or the top of secondary furnace 10, by combustion chamber 100 or secondary furnace 10 and outside Boundary is connected, and the first direct exhaust chimney 60 is vertically arranged.

The present embodiment stops heat supply, but the situation of not blowing out for boiler, and now flue gas is seldom in combustion chamber 100, flue gas Secondary dedusting system need not be passed through to discharge, but air is directly discharged into by the first direct exhaust chimney 60.

Referring to Fig. 1, further, water film dedusting unit 30 is additionally provided with the second direct exhaust chimney 34, the second direct exhaust chimney 34 Air inlet is connected with the steam vent of water tank 31, and the inner chamber of water tank 31 is in communication with the outside, and the second direct exhaust chimney 34 is vertically arranged.

For the sulfur in flue gas can not complete situation, sulfureous in flue gas part can produce corrosive substance and damage dedusting and set It is standby；By the second direct exhaust chimney 34 by the sulfur in flue gas from high altitude discharge, so as to avoid equipment corrosion from damaging.

Above disclosed is only the utility model preferred embodiment, can not limit the utility model with this certainly Interest field, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and according to this reality The equivalent variations made with new claim, still fall within the scope that utility model is covered.

Claims (6)

1. A kind of 1. normal-pressure boiler secondary dedusting system, it is characterised in that：Be arranged on including one in boiler body, and with boiler sheet The secondary furnace of the combustion chamber of body, the cyclone dust removal unit being arranged on outside boiler body, water film dedusting unit；The secondary furnace For a coal-fired flue-gas passage, flow direction of the coal-fired flue-gas passage along heat smoke is divided into coal-fired flue-gas entrance, first vertical Passage, horizontal channel, the second Vertical Channel, coal-fired flue-gas outlet；Coal-fired flue-gas entrance is with combustion chamber mouth everywhere in burning The top of room, coal-fired flue-gas from combustion chamber produce, from coal-fired flue-gas entrance flow into secondary furnace the first Vertical Channel, described first The bottom of Vertical Channel and one end of horizontal channel are connected, and the other end of horizontal channel is connected with the bottom of the second Vertical Channel, The top of second Vertical Channel exports for coal-fired flue-gas；The horizontal channel goes out less than coal-fired flue-gas entrance and coal-fired flue-gas Mouth is set, so that coal-fired flue-gas forms the tortuous trend of U-shaped in secondary furnace；The cyclone dust removal unit include cyclone dust collectors, Air-introduced machine；The air inlet of the cyclone dust collectors and above-mentioned coal-fired flue-gas outlet, the exhaust outlet of the cyclone dust collectors with The air inlet connection of air-introduced machine；The water film dedusting unit includes the water tank of an inner division plate, a side of the water tank An air admission hole connected with air-introduced machine exhaust outlet is provided with, is provided with a steam vent at the top of water tank, the dividing plate is towards water tank Air admission hole be fixed in water tank, and relative air admission hole is obliquely installed, and the coal-fired flue-gas entered from water tank air admission hole is changed It is changed into flowing to water tank bottom；For water tank built with limewash, the water surface of limewash is less than the bottom of dividing plate.
2. 2. normal-pressure boiler secondary dedusting system as claimed in claim 1, it is characterised in that：First Vertical Channel it is transversal Face area expands along coal-fired flue-gas flow direction, so that into the coal-fired flue-gas of the first Vertical Channel into turbulent flow.
3. 3. normal-pressure boiler secondary dedusting system as claimed in claim 2, it is characterised in that：Set in second Vertical Channel The snakelike cooling coil of flow media can be added by having, to reduce the temperature of coal-fired flue-gas.
4. 4. normal-pressure boiler secondary dedusting system as claimed in claim 3, it is characterised in that：The normal-pressure boiler final dusting system System also includes economizer, there is a U-shaped flue for coal-fired flue-gas circulation, the inwall of the U-shaped flue inside the economizer Provided with the interlayer for flow media circulation, so that the flow media in interlayer carries out hot friendship with entering the coal-fired flue-gas of U-shaped flue Change, the both ends open of the U-shaped flue is respectively the air inlet and exhaust outlet of economizer, the air inlet of the economizer with it is coal-fired Exhanst gas outlet connects, and the exhaust outlet of the economizer connects with the air inlet of air-introduced machine.
5. 5. normal-pressure boiler secondary dedusting system as claimed in claim 4, it is characterised in that：The normal-pressure boiler final dusting system System also sets up the first direct exhaust chimney of a controllable conduction, and first direct exhaust chimney is arranged at combustion chamber or the top of secondary furnace Portion, combustion chamber or secondary furnace are in communication with the outside, first direct exhaust chimney is vertically arranged.
6. 6. normal-pressure boiler secondary dedusting system as claimed in claim 5, it is characterised in that：The water film dedusting unit is also set up There is the second direct exhaust chimney, the air inlet of second direct exhaust chimney and the steam vent of water tank connect, by water tank cavity and the external world Connection, second direct exhaust chimney are vertically arranged.