CN207975678U - A kind of isobaric annular air compartment and its boiler system for boiler secondary air - Google Patents
A kind of isobaric annular air compartment and its boiler system for boiler secondary air Download PDFInfo
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- CN207975678U CN207975678U CN201820212752.8U CN201820212752U CN207975678U CN 207975678 U CN207975678 U CN 207975678U CN 201820212752 U CN201820212752 U CN 201820212752U CN 207975678 U CN207975678 U CN 207975678U
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- annular
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Abstract
The utility model discloses a kind of isobaric annular air compartment for boiler secondary air and its boiler systems, the equipressure annular air compartment is arranged in the burner hearth surrounding of boiler and forms closed loop chamber by being surrounded around one week air duct of burner hearth, there is Secondary Air entrance and Secondary Air to export for the equipressure annular air compartment, the equipressure annular air compartment is connected to by Secondary Air entrance with the secondary air passage of air preheater, the Secondary Air exit is provided with the connection air duct arranged along furnace height direction and be connected to the isobaric annular air compartment, wherein, branch's air duct access that the burner group being arranged on furnace wall cooling is drawn by its entrance connects air duct and is connected to the isobaric annular air compartment.The boiler system includes then the constant wall pressure ring shape air compartment.The utility model realizes reasonable wind distribution, and combustion stability is enhanced while each burner secondary air flow of leveling.
Description
Technical field
The utility model is related to the technical fields of station boiler, more particularly, are related to a kind of for boiler secondary air
Isobaric annular air compartment and its boiler system.
Background technology
Global lignite oil in place is about 4,000,000,000,000 tons, accounts for about the 40% of worldwide coal reserves.China's lignite resource is abundant,
According to statistics at the end of the 20th century, China is existing to verify 130,000,000,000 tons of lignite reserves, accounts for 13% or so of national coal gross reserves.
Due to the adjustment of global energy shortage and energy resource structure, people's is increasingly obtained to the utilization of the colms such as lignite
Pay attention to.China's lignite reserves are relatively abundanter, there is the natural conditions for developing and using lignite；The high-efficiency cleaning of lignite, which utilizes, can also meet
National energy-saving lowers consumption, and reduces the policy of discharge.Exploitation of the China to lignite as station boiler steam coal is started late, but brown
Coal reserves is relatively abundanter, has prerequisite to the utilization of lignite.
Current boiler using brown coal mainly uses ∏ types and tower two kinds of arrangement, prepares medium-speed pulverizer unit pulverized-coal system and fan
Grind unit pulverized-coal system.The low-moisture boiler using brown coal in generally uses medium-speed pulverizer unit pulverized-coal system；For middle height
The boiler using brown coal of moisture or more need to use direct feed pulverized coal-fan mill pulverized coal preparation system.
For the boiler using direct feed pulverized coal-fan mill pulverized coal preparation system, blowing system has the following problems：
1) the secondary air separating branch air duct of every group of burner differs greatly and resistance difference is big
As shown in Figure 1A, now generally using hexagonal (or octagonal) tangential firing arrangement, coal pulverizer surrounds the four of burner hearth
Week is evenly arranged, the burner at the corresponding angle of every mill.Since burner arrangement is in four sides wall, every group of burner it is secondary
Wind introduces branch pipe and trend there are larger difference, and resistance difference is big；As shown in Figure 1B, conventional medium-speed pulverizer corner tangential firing pot
Stove can then accomplish that quadrangle liquidates arrangement substantially.
2) the coal-grinding machine-cut stopping time causes burning tissues poor, easy slagging
For conventional Process In A Tangential Firing, singly when a certain coal pulverizer of stoppage in transit, stop transport a corresponding wind snout and correspondence
Good overfire air port, hearth combustion is still " quadrangle " tangential firing mode at this time, and burning combination will not deteriorate；And fan mill system
When stoppage in transit coal pulverizer, the burner group of the corresponding angles of a certain mill can entirely stop transport, and hearth combustion can be by " hexagonal fireball " at this time
Become " five jiaos of fireballs ", burning tissues can deteriorate, this just needs Secondary Air cooperation to keep good burning tissues, prevents fireball
The problems such as deflection slagging.And fan mill conventional arrangement makes Secondary Air there are larger resistance difference, cut stop mill when without
Method accomplishes the allocation of the amount of air of rationality.
3) fanned powder-grinding system First air is rigidly weak, and secondary air separating easily leads to unstable combustion with unevenness
Fanned powder-grinding system provides primary air pressure by fan mill coal pulverizer, but since fan mill promotes pressure head not
Foot, primary air velocity is usually relatively low, and First air rigidity is insufficient, this just needs Secondary Air to provide enough rigidity to carry out the good flame of tissue
Burning.But since each branch's duct resistance difference is big, it can not accomplish the rational allocation of the amount of air in each air duct, it is ensured that rational combustion
Burn tissue and stove combusting air aerodynamic field.
Therefore, it is necessary to solve each duct resistance matching and wind in the boiler system using direct feed pulverized coal-fan mill pulverized coal preparation system
The uneven problem of amount classification.
Invention content
In order to solve asking with fan mill tangentially firing boiler each group burner secondary air separating branch air duct Drag distribution unevenness
Topic, the purpose of this utility model are to provide a kind of Secondary Air cooperation plenum chamber structure realization reasonable wind distribution of isobaric annular air compartment,
Strengthen burning stability while each burner secondary air flow of leveling.
The one side of the utility model provides a kind of isobaric annular air compartment for boiler secondary air, the isobaric annular
Air compartment is arranged in the burner hearth surrounding of boiler and forms closed loop chamber by being surrounded around one week air duct of burner hearth, the isobaric annular
There is air compartment Secondary Air entrance and Secondary Air to export, the equipressure annular air compartment pass through Secondary Air entrance and air preheater two
Secondary wind air duct connection, the Secondary Air exit, which is provided with, to be arranged along furnace height direction and connects with the isobaric annular air compartment
Logical connection air duct, wherein branch's air duct access that the burner group being arranged on furnace wall cooling is drawn by its entrance connects
It gives a dinner for a visitor from afar and is connected to the isobaric annular air compartment.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the boiler are configuration
The tower boiler using brown coal of direct feed pulverized coal-fan mill pulverized coal preparation system.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the isobaric annular wind
Room is arranged on the top of burner hearth.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the Secondary Air entrance
It is arranged on rear side of burner hearth and the quantity of Secondary Air entrance is equal with the quantity of the secondary air passage of air preheater.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, burner group edge
If the short transverse for burner hearth is disposed with dried layer, there are several burners, the Secondary Air outlet and connection air duct per layer arrangement
Quantity it is equal with the quantity of every layer of burner.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the isobaric annular wind
The cross-sectional shape of room is round, square, rectangle or ellipse.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the isobaric annular wind
Room is cross-section equipressure annular air compartment or variable cross-section equipressure annular air compartment.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, in the branch air duct
It is provided with secondary air register.
One embodiment according to the utility model for the isobaric annular air compartment of boiler secondary air, the isobaric annular wind
The wind pressure of chamber interior everywhere it is equal and it is each connection air duct and branch air duct structure it is consistent.
The another aspect of the utility model provides a kind of boiler system, including the above-mentioned constant wall pressure ring for boiler secondary air
Shape air compartment.
Compared with prior art, isobaric annular air compartment provided by the utility model is conducive to each burner in boiler system
The stability of secondary air flow leveling and strengthen burning especially matches fanned powder-grinding system under the combination that puts into operation of different coal pulverizers
Can reasonable wind distribution neatly be carried out to hearth combustion, cause eccentricity of fire problem to carry out " correction " " corner cut " burning, reduce
Eccentricity of fire washes away water-cooling wall and causes slagging, prevents hearth combustion power from deteriorating, and reduces flue gas temperature of hearth outlet deviation.
Description of the drawings
Figure 1A shows the structural schematic diagram of conventional six-corner tangential Secondary Air air compartment in the prior art, and Figure 1B shows existing
The structural schematic diagram of conventional quadrangle tangential circle Secondary Air air compartment in technology.
Fig. 2 shows the knots according to the isobaric annular air compartment for boiler secondary air of the utility model exemplary embodiment
Structure schematic diagram.
Reference sign：
1- burner hearths, 2- equipressures annular air compartment, the secondary air passage of 3- air preheaters, 4- Secondary Airs entrance, 5- Secondary Airs
Outlet, 6- connections air duct, 7- branches air duct, 8- burners.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
Structure and principle progress below first to the utility model for the isobaric annular air compartment of boiler secondary air is detailed
Explanation.
Fig. 2 shows the knots according to the isobaric annular air compartment for boiler secondary air of the utility model exemplary embodiment
Structure schematic diagram.
As shown in Fig. 2, exemplary embodiment according to the present utility model, the annular wind of the equipressure for boiler secondary air
Room 2 is arranged in 1 surrounding of burner hearth of boiler and forms closed loop chamber by being surrounded around 1 one weeks air ducts of burner hearth, the constant wall pressure ring shape
Air compartment various places inside be connected to and it is uninterrupted.In fact, the constant wall pressure ring shape air compartment is exactly a kind of Secondary Air air compartment, for being transported to
The hot Secondary Air of each burner carries out leveling and evenly distributes.Preferably, which is configuration direct feed pulverized coal-fan mill pulverized coal preparation system
Tower boiler using brown coal.
Isobaric annular air compartment 2 has Secondary Air entrance 4 and Secondary Air outlet 5, and isobaric annular air compartment 2 passes through Secondary Air entrance
4 are connected to the secondary air passage 3 of air preheater.Preferably, the setting of Secondary Air entrance 4 is on rear side of burner hearth 1 and Secondary Air enters
The quantity of mouth 4 is equal with the quantity of secondary air passage 3 of air preheater, such as shown in Fig. 2, and setting enters there are two Secondary Air
Mouth 4.The air preheater of hot Secondary Air both sides after burner hearth leads to the equipressure by secondary air passage upwards after drawing as a result,
Annular air compartment 2, interface (i.e. Secondary Air entrance 4) are located on rear side of burner hearth, then the hot Secondary Air of two-way closes in isobaric annular air compartment 2
And the wind pressure deviation of hot Secondary Air at left and right sides of boiler furnace can be balanced.In addition, the hot secondary distribution in air preheater is given
Exit may also set up contact air duct, further the Secondary Air wind pressure of the balance left and right sides.
It is provided with the connection wind arranged along 1 short transverse of burner hearth and be connected to isobaric annular air compartment 2 at Secondary Air outlet 5
Road 6, wherein the access connection air duct 6 of branch air duct 7 that the burner group being arranged on 1 water-cooling wall of burner hearth is drawn by its entrance
And be connected to the isobaric annular air compartment 2, then come from air preheater hot Secondary Air enter isobaric annular air compartment 2 after lead to
It crosses connection air duct 6 and each branch air duct 7 and is assigned to each burner.In fact, the isobaric annular air compartment of the utility model is similar to
The big bellows of conventional boiler act on, in annular air compartment everywhere in pressure it is equal, to balance the wind pressure of each branch air duct entrance, guarantor
The intake for holding each corner cut burner is balanced, prevents the partially fiery phenomenon caused by each angle air quantity unevenness, ensures flameholding in stove
And even flow field.
Preferred embodiment according to the present utility model, the constant wall pressure ring shape air compartment 2 are arranged on the top of burner hearth 1, can avoid
Interference with the fan mill stove pipe of lower dense, primary air piping etc..Hot Secondary Air comes out backward from air preheater as a result,
On led in isobaric annular air compartment 2 via secondary air passage, then the connection air duct 6 by arranging straight down is assigned to each branch
Air duct 7 and the burner 8 connected.
Wherein, if burner group is disposed with dried layer along the short transverse of burner hearth 1, such as 4~8 layers can be arranged；Every layer
Several burners 8 are disposed with, burner 8 can be arranged according to the requirement of used combustion system in each corner cut, corner cut number
Amount is corresponding with coal pulverizer quantity, then 6 burners is configured for every layer for example, by using 6 jiaos of tangential firing modes, for example, by using 8 jiaos of circle of contacts
Combustion system formula then configures 8 burners for every layer；The quantity for connecting air duct 6 is equal with the quantity of every layer of burner 8, i.e. constant wall pressure ring
Shape air compartment 2 draws the connection air duct of corresponding corner cut quantity straight down, and each layer burner of each corner cut is by respective branch air duct
It is connected with the connection air duct arranged straight down.
The wind pressure of equipressure annular air compartment 2 various places inside described in the utility model is equal and each connection air duct 6 and branch air duct 7
Structure it is consistent, convenient for adjusting the Secondary Air air quantity uniformity of each each layer in angle, keep good flameholding in stove and reduce stove
Interior deviation.
Preferably, it is provided with secondary air register (not shown) in each branch air duct 7, to adjust the wind of each burner nozzle
Amount.
According to the utility model, the cross-sectional shape of isobaric annular air compartment 2 can be round, square, rectangle or
The shapes such as ellipse.Since the cross section of isobaric annular air compartment 2 is larger, flow velocity is relatively low in air compartment, from Secondary Air entrance 4 to secondary
Resistance is smaller everywhere for wind outlet 5, can be similar to zero, then it is equal to export 5 each point static pressures for Secondary Air.Certainly, the constant wall pressure ring shape wind
Specific size, concrete structure, section arrangement and the arrangement of Secondary Air incorporation way and burner of room 2 need to be because of items
Mesh specifically designs.
Boiler system provided by the utility model includes then the above-mentioned isobaric annular air compartment for boiler secondary air, thus
Avoiding the secondary air separating branch air duct of each group burner in system, there are larger resistance differences so that resistance, assignment of traffic are equal
It is even.
Below by specific embodiment, the utility model is described in further detail.
As shown in Fig. 2, being specially the tower boiler using brown coal for configuring direct feed pulverized coal-fan mill pulverized coal preparation system, burner arrangement is in stove
On four metopes of thorax water-cooling wall, in 6 jiaos of tangential firing modes as an example, isobaric annular air compartment is arranged in upper furnace, by enclosing
It is encircled into closed loop chamber and the composition constant wall pressure ring shape air compartment, the air of hot Secondary Air both sides after burner hearth around one week air duct of burner hearth
Preheater leads to isobaric annular air compartment by secondary air passage upwards after drawing, and after Secondary Air entrance is located at stove, two-way heat is secondary
Wind merges in the constant wall pressure ring shape air compartment.6 corner cut burner groups pass through the connection air duct arranged straight down and constant wall pressure ring
Shape air compartment connects, and the overfire air port of each layer burner connects air duct by the branch's air duct access respectively drawn, in each branch
Secondary air register is provided in air duct to adjust the air quantity of each spout.
Wherein, isobaric annular air compartment's various places inside wind pressure is equal, and the structure in each connection air duct and branch air duct is consistent, so as to
In the uniformity for adjusting each each layer Secondary Air air quantity in angle, keeps good flameholding row in stove and reduce deviation in stove.
Specifically, isobaric realization method is specially in the constant wall pressure ring shape air compartment：Secondary Air introduces and arrangement of burner
Different because of project, by taking the arrangement form in Fig. 2 as an example, the hot Secondary Air of the constant wall pressure ring shape air compartment introduces after burner hearth, stokehold,
One group of burner d and a are respectively arranged after stove, in a stove left side, stove right each arrangement 2 groups of burner e, f and b, c, Secondary Air inlet O Interface
Point on the basis of point, each burner a, b, c, d, e, f correspond to Secondary Air exit A, B, C, D, E, the F interface in each connection air duct
Point.
Air compartment inner second air flow velocity is relatively low, and 5 (A, B, C, D, E, F) resistances everywhere are exported from Secondary Air entrance 4 to Secondary Air
It is smaller, zero can be similar to, then the static pressure of Secondary Air 5 each points of outlet (A, B, C, D, E, F) is equal.Corner cut a, b, c, d, e, f couple
Each layer branch air duct 7 and corresponding connection 6 structure of air duct answered are consistent, and resistance is equal, then wind pressure at every layer of each burner inlet
It is equal.
In conclusion equipressure annular air compartment provided by the utility model is conducive to the Secondary Air of each burner in boiler system
The stability of leveling and strengthen burning is measured, especially matching fanned powder-grinding system being capable of spirit under the combination that puts into operation of different coal pulverizers
Reasonable wind distribution is carried out to hearth combustion livingly, causes eccentricity of fire problem to carry out " correction " " corner cut " burning, it is inclined to reduce flame
Oblique impact swabbing cold wall and cause slagging, prevent hearth combustion power deteriorate, reduce flue gas temperature of hearth outlet deviation.
The utility model is not limited to specific implementation mode above-mentioned.The utility model expands to any in this specification
The new feature of middle disclosure or any new combination, and disclose any new method or process the step of or any new group
It closes.
Claims (9)
1. a kind of isobaric annular air compartment for boiler secondary air, which is characterized in that the equipressure annular air compartment is arranged in boiler
Burner hearth surrounding and form closed loop chamber by being surrounded around one week air duct of burner hearth, it is described equipressure annular air compartment have Secondary Air
Entrance and Secondary Air outlet, the equipressure annular air compartment are connected to by Secondary Air entrance with the secondary air passage of air preheater,
The Secondary Air exit is provided with the connection air duct arranged along furnace height direction and be connected to the isobaric annular air compartment,
Wherein, be arranged the branch air duct access connection air duct that burner group on furnace wall cooling is drawn by its entrance and with it is described
Isobaric annular air compartment's connection.
2. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that the boiler is configuration
The tower boiler using brown coal of direct feed pulverized coal-fan mill pulverized coal preparation system.
3. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that the isobaric annular wind
Room is arranged on the top of burner hearth.
4. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that the Secondary Air entrance
It is arranged on rear side of burner hearth and the quantity of Secondary Air entrance is equal with the quantity of the secondary air passage of air preheater.
5. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that burner group edge
If the short transverse for burner hearth is disposed with dried layer, there are several burners, the Secondary Air outlet and connection air duct per layer arrangement
Quantity it is equal with the quantity of every layer of burner.
6. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that the isobaric annular wind
The cross-sectional shape of room is round, square, rectangle or ellipse.
7. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that in the branch air duct
It is provided with secondary air register.
8. being used for the isobaric annular air compartment of boiler secondary air according to claim 1, which is characterized in that the isobaric annular wind
The wind pressure of chamber interior everywhere it is equal and it is each connection air duct and branch air duct structure it is consistent.
9. a kind of boiler system, which is characterized in that including described in any one of claim 1 to 8 be used for boiler secondary air etc.
Press annular air compartment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820212752.8U CN207975678U (en) | 2018-02-07 | 2018-02-07 | A kind of isobaric annular air compartment and its boiler system for boiler secondary air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820212752.8U CN207975678U (en) | 2018-02-07 | 2018-02-07 | A kind of isobaric annular air compartment and its boiler system for boiler secondary air |
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| CN207975678U true CN207975678U (en) | 2018-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180500A (en) * | 2018-02-07 | 2018-06-19 | 东方电气集团东方锅炉股份有限公司 | A kind of isobaric annular air compartment and its boiler system for boiler secondary air |
-
2018
- 2018-02-07 CN CN201820212752.8U patent/CN207975678U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108180500A (en) * | 2018-02-07 | 2018-06-19 | 东方电气集团东方锅炉股份有限公司 | A kind of isobaric annular air compartment and its boiler system for boiler secondary air |
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