CN102032564B - Pulverized coal burner and boiler having same - Google Patents
Pulverized coal burner and boiler having same Download PDFInfo
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- CN102032564B CN102032564B CN 200910175072 CN200910175072A CN102032564B CN 102032564 B CN102032564 B CN 102032564B CN 200910175072 CN200910175072 CN 200910175072 CN 200910175072 A CN200910175072 A CN 200910175072A CN 102032564 B CN102032564 B CN 102032564B
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- combustion chamber
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- coal
- coal burner
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- 239000003245 coal Substances 0.000 title claims abstract description 111
- 238000002485 combustion reaction Methods 0.000 claims abstract description 95
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims abstract description 3
- 239000002817 coal dust Substances 0.000 claims description 53
- 230000007704 transition Effects 0.000 claims description 16
- 230000008676 import Effects 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000008602 contraction Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000013067 intermediate product Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- -1 NHi (i=0 Chemical compound 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses a pulverized coal burner and a boiler having the same. The pulverized coal burner comprises a heat source and an internal-combustion chamber for keeping the preset excess air coefficient of an internal pulverized coal air flow, wherein the heat source is positioned in the combustion chamber, and the internal-combustion chamber has an inlet and an outlet; and the heat source can light pulverized coal in the internal-combustion chamber and make the pulverized coal undergo reducing burning in the internal-combustion chamber; and the internal-combustion chamber comprises a metal outer cylinder and a ceramic liner. The ceramic material for making the liner of the pulverized coal burner has excellent high-temperature performance, and can retain corresponding mechanical performance under a continuous high-temperature condition; and the ceramic material has high thermal-insulation effect and can keep a higher temperature in the internal-combustion chamber of the pulverized coal burner.
Description
Technical field
The present invention relates to a kind of combustion apparatus, particularly a kind of coal burner also relates to the boiler with this coal burner.
Background technology
The applicant provides a kind of coal burner in the patent application of another part denomination of invention for " a kind of coal burner and have the boiler of this coal burner ", please refer to Fig. 1, and this figure illustrates the structure of the coal burner that foregoing invention provides.This coal burner comprises thermal source 330 and internal combustion chamber 320, and internal combustion chamber 320 has import 101 and outlet 102, and internal combustion chamber 320 forms a suitable space, has predetermined excess air coefficient to keep inner breeze airflow.The import 101 of internal combustion chamber 320 communicates with a wind pulverized coal channel, and breeze airflow enters in the internal combustion chamber 320 by wind pulverized coal channel, an import 101.Thermal source 330 stretches into the internal combustion chamber 320 from transition conduit 300, will light by the coal dust that import 101 enters internal combustion chamber 320 constantly.
On the breeze airflow flow direction, described internal combustion chamber 320 has predetermined length, and can keep excess air coefficient in the breeze airflow much smaller than 1.The excess air coefficient here refers to, the ratio of required theoretical air requirement when the actual air capacity that feeds internal combustion chamber 320 and completing combustion 1kg coal dust during burning 1kg coal dust.The mode of keeping predetermined excess air coefficient can be the ratio of air and coal dust in the restriction breeze airflow, and excess air coefficient is relevant with coal: the moisture of coal is more big, and excess air coefficient is more big, and pit ash is more big, and excess air coefficient is more little; Otherwise the moisture of coal is more little, and excess air coefficient is more big, and pit ash is more little, and excess air coefficient is more big.By simple test, just can determine the excess air coefficient that is fit to, obtain optimum technique effect.Preferably between 0.15-0.45, coal burner can be kept smooth combustion to excess air coefficient in this scope, can be implemented in the strong reducing atmosphere of internal combustion chamber 320 interior formation of coal powder ignition simultaneously, thereby suppresses the generation of nitrogen oxide effectively.
The course of work of the coal burner that this invention provides is: excess air coefficient is that the breeze airflow of 0.15-0.45 is when the internal combustion chamber 320, thermal source 330 is constantly with coal dust in the breeze airflow, incomplete, reproducibility burning that coal dust carries out in internal combustion chamber 320, the flame that the reproducibility burning forms is propagated in internal combustion chamber 320, and discharge heat, form suitable hot environment in internal combustion chamber 320, breeze airflow forms the high temperature pulverized coal flame from exporting 102 ejections.In the reproducibility combustion process, continuation thermal source 330 and the excess air coefficient condition much smaller than 1 makes keeps a reducing atmosphere in the internal combustion chamber 320.Under this hot environment, reducing atmosphere at first is thermal decomposited the nitrogen element in the coal dust, and changes into reproducibility intermediate product and nitrogen oxide such as NHi (i=0,1,2), HCN.The reproducibility intermediate product generates nitrogen with the reaction of nitrogen oxides that has generated.
Breeze airflow is in internal combustion chamber 320 internal combustion, the high temperature pulverized coal flame that forms is sprayed onto in the burner hearth by exporting 102, like this, coal dust catches fire with regard to the high-temperature flue gas that does not rely in the burner hearth, thereby for follow-up the burning away in burner hearth of coal dust provides good catch fire basis and condition, satisfy in the boiler furnace needs of coal dust smooth combustion.
Coal dust carries out in internal combustion chamber 320 in the reproducibility combustion process, and corresponding nitrogen element is converted into nitrogen, thereby can reduce the nitrogen element content in the coal dust that enters burner hearth, reduces the growing amount of the fuel NO that produces when coal dust burns in burner hearth; Because fuel NO is the chief component of the nitrogen oxide of coal dust firing, thereby can reduce the growing amount of nitrogen oxide in the burner hearth combustion process, reduce the growing amount of nitrogen oxide in the boiler running process.
When adopting above-mentioned internal combustion type pulverized coal burner, because coal dust is burning constantly in internal combustion chamber, and outwards spray the high temperature pulverized coal flame by described outlet, this working environment has proposed very high requirement to coal burner, require coal burner to have higher heat-resisting, anti-wear performance, also require to have suitable heat-insulating property, to reduce scattering and disappearing of heat.Yet the burner of prior art can't satisfy these requirements.
Summary of the invention
First purpose of the present invention is to provide a kind of coal burner with higher heat-resisting, anti-wear performance, and simultaneously, the heat that reduces coal burner scatters and disappears.
Second purpose of the present invention is to provide a kind of boiler with above-mentioned coal burner.
In order to realize above-mentioned first purpose, coal burner provided by the invention comprises thermal source and keeps the internal combustion chamber that inner breeze airflow has predetermined excess air coefficient, and described thermal source is positioned at internal combustion chamber, and described internal combustion chamber has import and outlet; Described thermal source can be lighted the coal dust by internal combustion chamber, and makes coal dust carry out reproducibility burning in internal combustion chamber, and described internal combustion locular wall comprises that metal urceolus and ceramic material make liner.
Preferably, be provided with insulating sandwich between described liner and the described urceolus.
Preferably, described insulating sandwich is the gas thermal insulation layer.
Preferably, also be provided with supporting mechanism between described liner and the urceolus, so that described liner and urceolus relative fixed.
Optionally, described supporting mechanism and liner are connected as a single entity, and perhaps are connected as a single entity with urceolus.
Preferably, described coal burner comprises the expansion transition piece of the Taper Pipe shape that rear end and liner front end join, and end cross-sectional area is less than the space of back end cross-sectional area before forming in this expansion transition piece.
Preferably, described expansion transition piece comprises the liner of being made by ceramic material.
Preferably, the main paragraph that joins before and after described liner comprises and the contraction changeover portion of Taper Pipe shape, end cross-sectional area was greater than the space of back end cross-sectional area before this shrank and forms in the changeover portion.
Preferably, described liner comprises that also the outlet of the tubular that joins with described contraction changeover portion rear end adjusts section, before this outlet is adjusted and is formed in the section end cross-sectional area with after the space that equates of end cross-sectional area.
In order to realize above-mentioned second purpose, boiler provided by the invention comprises burner hearth, also have above-mentioned any coal burner, the internal combustion chamber of described coal burner communicates with described burner hearth, makes the high temperature pulverized coal flame inject described burner hearth through described internal combustion chamber outlet.
Coal burner provided by the invention has metal urceolus, has the liner of tubular in the urceolus, and described liner is made by ceramic material; The cylindric space that described liner surrounds forms the internal combustion chamber of coal burner.Because ceramic material has heat-resisting quantity and resistance to heat shocks preferably, thereby also have good temperature resistance and resistance to heat shocks by the liner that ceramic material is made, this liner not only can adapt to the rapid variation of coal burner temperature in startup, stopped process, can also under the continuous high temperature condition, keep certain mechanical strength, and then can prolong the service life of coal burner.And the liner of being made by ceramic material has less pyroconductivity, can stop the heat of internal combustion chamber outwards to conduct better, reducing heat scatters and disappears, guarantee that internal combustion chamber has higher temperature, be conducive to separating out of coal dust volatile matter, for advantage has been created in the burning of coal dust; Simultaneously, guarantee the degree of coal dust reproducibility burning in internal combustion chamber.This structure can also make the outer surface of coal burner keep lower temperature, improves the security performance of coal burner.In addition, the liner that ceramic material is made also has characteristics such as wear-resistant, corrosion-resistant, can bear washing away of coal dust long period, avoids the high temperature corrosion problem of flue gas, thereby improves the serviceability of coal burner.
In further technical scheme, also be provided with insulating sandwich between the liner of coal burner and the urceolus.This structure can further reduce scattering and disappearing of heat, improves the temperature of internal combustion chamber, improves the combustibility of internal combustion chamber coal dust; Can also reduce coal burner urceolus temperature, improve the security of coal burner, guarantee that coal burner moves with security and stability.
In further technical scheme, described insulating sandwich is made as the air insulating sandwich, this designs simplification the structure of described coal burner, have characteristics easy to make, lower-cost; And because gas medium is very easy to obtain and change, therefore, can reduce the operation and maintenance cost of coal burner.
In further technical scheme, also be provided with supporting mechanism between the liner that ceramic material is made and the metal urceolus, so that liner and urceolus relative fixed prevent that liner from moving with respect to urceolus; This structure can improve the bulk strength of coal burner, guarantees the reliability of coal burner work.
In further technical scheme, described coal burner comprises the expansion transition piece of the Taper Pipe shape that joins with the liner front end.This expansion transition piece can make the flow velocity of breeze airflow reduce; Further, this structure can make coal dust stop the long time on the one hand in internal combustion chamber, coal dust is reached the coal dust liberated heat that has caught fire from thermal source absorb more heat, improve the flammability of coal dust, improve the stability that coal dust burns in boiler furnace; Reduce owing to the breeze airflow flow velocity is corresponding on the other hand; Can make coal dust in having the internal combustion chamber of predetermined length, stop the long time, make in the coal dust the nitrogen element as early as possible, how change into the reproducibility intermediate product to the greatest extent, finally be converted into nitrogen, and then suppress the generation of fuel NO better.Taper Pipe shape structure can be when reducing the primary air velocity degree, strengthen the turbulence intensity of breeze airflow, be conducive to improve the concentration of near axis coal dust in the internal combustion chamber, thereby can improve the flammability of colm, the burn-off rate of coal dust in the conformability of raising coal burner and the boiler.
In further technical scheme, described liner also comprises contraction changeover portion that join with the main paragraph rear end, the Taper Pipe shape.This structure can improve the speed that enters the high temperature pulverized coal flame in the boiler furnace, guarantee that burner hearth integral combustion tissue to internal combustion chamber outlet high temperature pulverized coal flame speed, momentum requirement, promotes the smooth combustion of tissue and the interior coal dust of burner hearth of aerodynamic field in the burner hearth.Taper Pipe shape structure can effectively reduce the generation of eddy current in the breeze airflow, and wall forms suitable fluidized bed on the internal combustion chamber limit, prevents localized burn and the coking of internal combustion chamber outlet.
In further technical scheme, described liner also comprises the outlet adjustment section of joining with described contraction changeover portion rear end.This structure can regular high temperature pulverized coal flame, improves the performance that coal burner jets out flames, and satisfies the needs of boiler combustion tissue.
Because coal burner has above-mentioned technique effect, have in the boiler of this coal burner, coal burner can provide more excellent high temperature pulverized coal flame to burner hearth, to satisfy the needs of burner hearth internal combustion tissue, improve the operational efficiency of boiler, reduce the minimum operation load of boiler, improve the conformability of boiler.
Description of drawings
Fig. 1 illustrates the structure of the coal burner that another invention of the applicant provides;
Fig. 2 illustrates the axial sectional structure of the coal burner that the embodiment of the invention one provides;
Fig. 3 illustrates the axial sectional structure of the coal burner that the embodiment of the invention two provides;
The A A cross-section structure of Fig. 4 schematic diagram 3;
Fig. 5 illustrates the axial sectional structure of the coal burner that the embodiment of the invention three provides;
Fig. 6 illustrates the axial sectional structure of the coal burner that the embodiment of the invention four provides;
Fig. 7 illustrates the supporting relation between the liner of metal urceolus and pottery vertically;
Fig. 8 illustrates the cross section of liner support zone of metal urceolus and pottery;
Fig. 9 illustrates the supporting construction that embodiment of the invention support section and pottery liner are connected as a single entity;
Figure 10 illustrates the supporting construction that embodiment of the invention support section and metal urceolus processed are connected as a single entity.
The specific embodiment
Below in conjunction with accompanying drawing technical scheme provided by the invention is described in detail, the description of this part only is exemplary and indicative explanation, should any restriction not arranged to protection scope of the present invention.
Should be noted that: in this part, be the direction consistent with breeze airflow flow direction in the internal combustion chamber axially, laterally be and axially vertical direction; And be reference with the coal dust flow direction, near the internal combustion chamber entrance location be before, away from the position of internal combustion chamber import be after.
Fig. 2 illustrates the axial sectional structure of the coal burner that the embodiment of the invention one provides.The coal burner that this example provides has metal urceolus 322, the main paragraph 321 of the liner that ceramic material is made, main paragraph 321 extends to form internal combustion chamber 320 vertically, internal combustion chamber 320 1 ends are import, this import communicates with the conduit 340 of input breeze airflow, and breeze airflow is entered in the internal combustion chamber 320, certainly, also can between internal combustion chamber 320 imports and conduit 340, transition portion be set, to connect import and conduit; The other end of internal combustion chamber 320 is outlet, and this outlet communicates with boiler furnace.Thermal source 330 in the coal burner ignites and enters the coal dust of internal combustion chamber 320, and coal dust is burnt in internal combustion chamber 320, and breeze airflow passes through internal combustion chamber 320 and finish burning in outlet enters the boiler furnace that is formed by furnace wall 310.
In this example, the liner that ceramic material is made has heat-resisting quantity and resistance to heat shocks preferably, thereby also have good temperature resistance and resistance to heat shocks by the liner that ceramic material is made, this liner not only can adapt to the rapid variation of coal burner temperature in startup, stopped process, can also under the continuous high temperature condition, keep certain mechanical strength, and then can prolong the service life of coal burner.And the liner of being made by ceramic material has less pyroconductivity, can stop the heat of internal combustion chamber 320 outwards to conduct better, reducing heat scatters and disappears, guarantee that internal combustion chamber 320 has higher temperature, be conducive to separating out of coal dust volatile matter, for advantage has been created in the burning of coal dust; Simultaneously, guarantee the degree of coal dust reproducibility burning in internal combustion chamber 320.This structure can also make the outer surface of coal burner keep lower temperature, improves the security performance of coal burner.In addition, the liner that ceramic material is made also has characteristics such as wear-resistant, corrosion-resistant, can bear washing away of coal dust long period, avoids the high temperature corrosion problem of flue gas, thereby improves the serviceability of coal burner.
Fig. 3 illustrates the axial sectional structure of the coal burner that the embodiment of the invention two provides.A-A cross-section structure in Fig. 4 schematic diagram 3.Present embodiment is provided with insulating sandwich 323 between liner that ceramic material is made and metal urceolus 322, insulating sandwich 323 can adopt known heat-barrier material, insulating sandwich 323 can reduce heat effectively and transmit to metal urceolus 322, reduced scattering and disappearing of heat, improve the temperature of internal combustion chamber 320, improve the combustibility of coal dust in the internal combustion chamber 320; Can also reduce coal burner urceolus 322 temperature, improve the security of coal burner, guarantee that coal burner moves with security and stability.
As shown in Figure 3, coal burner also comprises the expansion transition piece 350 of Taper Pipe shape, and end cross-sectional area was less than the space of back end cross-sectional area before expansion transition piece 350 formed, and its rear end and liner front end join; Namely on the breeze airflow flow direction, expansion transition piece 350 forms the long-pending ever-increasing one section breeze airflow passage of lateral cross section.Expansion transition piece 350 can make the flow velocity of breeze airflow reduce; Further, this structure can make coal dust stop the long time on the one hand in internal combustion chamber 320, coal dust is reached the coal dust liberated heat that has caught fire from thermal source absorb more heat, improve the flammability of coal dust, improve the stability that coal dust burns in boiler furnace; Reduce owing to the breeze airflow flow velocity is corresponding on the other hand; Can make coal dust in having the internal combustion chamber of predetermined length, stop the long time, make in the coal dust the nitrogen element as early as possible, how change into the reproducibility intermediate product to the greatest extent, finally be converted into nitrogen, and then suppress the generation of fuel NO better.Taper Pipe shape structure can be when reducing the primary air velocity degree, strengthen the turbulence intensity of breeze airflow, be conducive to improve the concentration of near axis coal dust in the internal combustion chamber, thereby can improve the flammability of colm, the burn-off rate of coal dust in the conformability of raising coal burner and the boiler.In this example, in order to guarantee the more dominance energy of coal burner, expansion transition piece 350 includes the liner that ceramic material is made; Because in expansion transition piece 350, temperature is lower than the temperature in the main paragraph 321, therefore, also can comprise the liner made from other materials.
As shown in Figure 3, liner also comprises the contraction changeover portion 360 that joins with main paragraph 321 rear ends, and shrinking changeover portion 360 is the Taper Pipe shape, and end cross-sectional area is greater than the space of back end cross-sectional area before forming in it; Namely on the breeze airflow flow direction, form the long-pending ever-reduced one section breeze airflow passage of lateral cross section.This structure can improve the speed that enters the high temperature pulverized coal flame in the boiler furnace, guarantee that burner hearth integral combustion tissue to internal combustion chamber 320 outlet high temperature pulverized coal flame speed, momentum requirement, promotes the smooth combustion of tissue and the interior coal dust of burner hearth of aerodynamic field in the burner hearth.Taper Pipe shape structure can effectively reduce the generation of eddy current in the breeze airflow, forms suitable fluidized bed at internal combustion chamber 320 limit walls, prevents localized burn and the coking of internal combustion chamber 320 outlets.
As shown in Figure 5, in the coal burner that embodiment three provides, liner can also comprise the outlet adjustment section 370 of the tubular that joins with contraction changeover portion 360 rear ends, the space that end cross-sectional area equated with the back end cross-sectional area before this outlet was adjusted and formed in the section, so that the high temperature pulverized coal flame is done further to adjust, improve the performance that coal burner jets out flames, satisfy the boiler combustion needs; Outlet is adjusted section 370 concrete structures and also can be arranged according to actual needs.
As shown in Figure 6, the embodiment of the invention four also provides the coal burner of another kind of structure.As preferred embodiment, insulating sandwich 323 is the gas insulating sandwich in the present embodiment, makes the gap between liner and the urceolus 322 that an amount of gas be arranged, and can further simplify the structure of insulating sandwich 323 like this; Because gas obtains and delivery easily, can reduce coal burner making, operation and maintenance cost.
Coal burner can also arrange supporting mechanism 326 between liner that ceramic material is made and metal urceolus 322; Fig. 7 illustrates the supporting relation between metal urceolus processed and the pottery liner, Fig. 8 to illustrate the cross section of metal urceolus and pottery liner support zone vertically.The outer surface of the liner that side of supporting mechanism 326 and ceramic material are made fits, and the inner surface of another side and metal urceolus 322 fits.The function of supporting mechanism 326 is: liner and metal urceolus 322 relative fixed that ceramic material is made, prevent that liner from moving with respect to urceolus 322, and improve the bulk strength of coal burner, guarantee the reliability of coal burner work.
This supporting mechanism 326 can be connected as a single entity with the liner that ceramic material is made, and as shown in Figure 9, the material of this supporting mechanism can be identical with liner.As shown in figure 10, supporting mechanism 326 can also be connected as a single entity with the urceolus 322 of heat-resisting steel.
Providing on the basis of above-mentioned coal burner, a kind of boiler also is provided, the boiler that provides comprises burner hearth, also has above-mentioned coal burner, the outlet of the internal combustion chamber of this coal burner communicates with burner hearth, make the high temperature pulverized coal flame inject described boiler furnace through the outlet of described coal burner, for the smooth combustion of coal dust in the boiler furnace provides condition.Because coal burner has above-mentioned technique effect, the boiler with this coal burner has corresponding technique effect.
The above only is preferred embodiment of the present invention, should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make many improvement, and these improvement also should be considered as protection scope of the present invention.
Claims (8)
1. a coal burner is characterized in that, comprises thermal source and keeps the internal combustion chamber that inner breeze airflow has predetermined excess air coefficient, and described thermal source is positioned at internal combustion chamber, and described internal combustion chamber has import and outlet; Described thermal source can be lighted the coal dust by internal combustion chamber, and make coal dust in internal combustion chamber, carry out the reproducibility burning, the wall of described internal combustion chamber comprises the liner that metal urceolus and ceramic material are made, the main paragraph that joins before and after described liner comprises and the contraction changeover portion of Taper Pipe shape, end cross-sectional area was greater than the space of back end cross-sectional area before this shrank and forms in the changeover portion; Described liner comprises that also the outlet of the tubular that joins with described contraction changeover portion rear end adjusts section, before this outlet is adjusted and is formed in the section end cross-sectional area with after the space that equates of end cross-sectional area.
2. coal burner according to claim 1 is characterized in that, is provided with insulating sandwich between described liner and the described urceolus.
3. coal burner according to claim 2 is characterized in that, described insulating sandwich is the gas thermal insulation layer.
4. according to each described coal burner of claim 1-3, it is characterized in that, also be provided with supporting mechanism between described liner and the urceolus, so that described liner and urceolus relative fixed.
5. coal burner according to claim 4 is characterized in that, the liner of the wall of described supporting mechanism and described internal combustion chamber is connected as a single entity, and perhaps the urceolus with the wall of described internal combustion chamber is connected as a single entity.
6. coal burner according to claim 4 is characterized in that, comprises the expansion transition piece of the Taper Pipe shape that rear end and liner front end join, and end cross-sectional area is less than the space of back end cross-sectional area before forming in this expansion transition piece.
7. coal burner according to claim 6 is characterized in that, described expansion transition piece comprises the liner of being made by ceramic material.
8. a boiler comprises burner hearth, it is characterized in that, also has each described coal burner among the claim 1-7, and the internal combustion chamber of described coal burner communicates with described burner hearth, makes the high temperature pulverized coal flame inject described burner hearth through described internal combustion chamber outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910175072 CN102032564B (en) | 2009-09-27 | 2009-09-27 | Pulverized coal burner and boiler having same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910175072 CN102032564B (en) | 2009-09-27 | 2009-09-27 | Pulverized coal burner and boiler having same |
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| Publication Number | Publication Date |
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| CN102032564A CN102032564A (en) | 2011-04-27 |
| CN102032564B true CN102032564B (en) | 2013-08-14 |
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