CN210050796U - Circulating fluidized bed thermodynamic system arrangement structure burning ultrahigh ash fuel - Google Patents
Circulating fluidized bed thermodynamic system arrangement structure burning ultrahigh ash fuel Download PDFInfo
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- CN210050796U CN210050796U CN201920695973.XU CN201920695973U CN210050796U CN 210050796 U CN210050796 U CN 210050796U CN 201920695973 U CN201920695973 U CN 201920695973U CN 210050796 U CN210050796 U CN 210050796U
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Abstract
The utility model discloses a fire circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, apart from in the furnace the regional partial furnace space setting to the unequal cross-section structure more than 15% H of air distributor, the ratio α of maximum sectional area and minimum sectional area in the unequal cross-section structure region satisfies 1 < α and is less than or equal to 2, wherein, H is the height of air distributor to furnace roof in the furnace.
Description
Technical Field
The utility model relates to an utilize circulating fluidized bed boiler to fire the technical field of super high ash content fuel, more specifically say, relate to a fire circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel.
Background
The stone coal is widely distributed in China as a multi-metal symbiotic shale ore. The stone coal has the characteristics of high ash content, low heat value, high hardness and the like, and can be used as an inferior fuel and can also be used for extracting various rare metals from the inferior fuel. According to the statistics of data of Ministry of coal, the current stone coal resource reserves of about 618 hundred million tons in China are widely distributed in Hunan, Guangxi, Zhejiang, Jiangxi and other places, the stone coal is rich in associated vanadium resources, wherein V
2O
5V in stone coal of not less than 0.5%
2O
5The resource amount is 77075 kilotons which is V in the vanadium titano-magnetite of China
2O
5The resource amount is 2.7 times, and the extraction of vanadium from stone coal becomes an important development direction for utilizing vanadium resources in China.
Therefore, the method has the advantages that the mining and utilization value of the stone coal is high, an effective way for comprehensive utilization of the stone coal is explored, the heat resources and associated metals are fully utilized, the maximum benefit is ensured, and the method is an urgent problem to be solved in the current energy field.
The stone coal as fuel has the greatest characteristics of large ash amount, particularly low heat value, larger converted ash content and high silicon content in ash components, so the arrangement of a heating surface in a furnace needs to be considered particularly, and the wear-resistant characteristic of the stone coal is well made. The abrasion rate of the material to the pipe wall is in direct proportion to the cubic power of the flow velocity and in direct proportion to the concentration of the material, namely the abrasion is reduced, the particle velocity and the particle concentration are reduced, heat transfer in the furnace is required to be considered, and the heat transfer in the furnace cannot be sacrificed.
Therefore, the thermal system taking stone coal as fuel needs to solve the core problems that: the balance between low particle concentration in the furnace and heat transfer.
The chinese patent CN201010547451 discloses a comprehensive utilization method of vanadium extraction and power generation by burning stone coal in a circulating fluidized bed boiler, which mainly aims at performing co-combustion power generation by using stone coal and petroleum coke or anthracite in the circulating fluidized bed boiler, preparing sulfuric acid by using sulfur-containing flue gas, and performing acid-leaching vanadium extraction on ash generated after combustion by using the prepared sulfuric acid.
The chinese patent CN201310155681, "a circulating fluidized bed boiler system for extracting selenium from stone coal", mainly aims at increasing the content of selenium in fly ash entering a selenium extraction system and reducing the amount of fly ash entering the selenium extraction system, and does not specifically consider how to arrange heating surfaces in a circulating fluidized bed boiler burning stone coal.
Chinese patent No. CN201310431117, "a multi-bed circulating fluidized bed stone coal decarbonization device", mainly describes a multi-bed circulating fluidized bed stone coal decarbonization device for realizing stable combustion of low-calorific-value stone coal and high decarbonization efficiency, and how to arrange the heated surfaces of the circulating fluidized bed boiler burning stone coal is not considered in detail.
However, none of the above patents solves the core problem, i.e., the balance between low particle concentration and heat transfer in the furnace, and still limits the efficient use of ultra-high ash fuel with 60% ash content such as stone coal.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a can solve the interior low particle concentration of stove and the balance problem between the heat transfer betterly burn circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel.
The utility model provides a fire circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, apart from the partial furnace space setting of region more than 15% H of grid plate in the furnace to be non-uniform cross section structure, the maximum sectional area in the non-uniform cross section structure region satisfies 1 < α and is less than or equal to 2 with the ratio α of minimum sectional area, and wherein, H is the height of grid plate to furnace roof in the furnace.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, apart from air distribution plate 15% H ~ 50% H's partial furnace space sets up to non-uniform cross section structure in the furnace, the air distribution plate is single air distribution plate or two air distribution plates.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of superelevation ash content fuel, it is 3 ~ 5m/s to enlarge furnace sectional area to the furnace section speed under the BMCR operating mode.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, work as when super high ash content fuel is the stone coal, furnace's the biggest fuel particle diameter of going into stove is controlled within 6 mm.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, circulating fluidized bed thermodynamic system arrangement structure includes furnace, separation unit entry flue, separation unit export flue, afterbody flue and feed back unit, furnace passes through separation unit entry flue and links to each other with the separation unit, the separation unit passes through separation unit export flue and links to each other with the afterbody flue and links to each other with furnace through the feed back unit, circulating fluidized bed thermodynamic system arrangement structure still includes the over heater, the screen type over heater is not arranged in the furnace.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, circulating fluidized bed thermodynamic system arrangement structure still includes the reheater, the reheater heating surface is not arranged in the furnace.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash fuel, circulating fluidized bed thermodynamic system arrangement structure still includes external heat exchanger, arrange partly over heater in the external heat exchanger.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash fuel, circulating fluidized bed thermodynamic system arrangement structure still includes external heat exchanger, arrange partly over heater and a part re-heater in the external heat exchanger.
According to the utility model discloses burn circulating fluidized bed thermodynamic system arrangement structure's of super high ash content fuel one embodiment, furnace lower part lateral wall all is provided with the fine residue discharge port apart from position and feed back unit department between 200mm ~ H/2 of aerofoil.
According to the utility model discloses burn an embodiment of circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel, external heat exchanger is provided with the fine sediment discharge port.
Compare with current conventional circulating fluidized bed coal fired boiler, the utility model discloses a system is fired with super high ash content fuel and is had following several advantages:
1) the hearth space above a certain area of the air distribution plate is of a non-uniform cross-section structure, so that large solid particles in bed materials and fuel cannot be carried to the upper part of the hearth by hot smoke, and the concentration of the small solid particles on the upper part of the hearth can be controlled to reduce abrasion;
2) the section of the hearth is properly enlarged, so that the lower solid particle entrainment rate is realized, and the lower solid particle concentration in the flue gas is maintained, so that the abrasion is reduced;
3) the particle size of the fuel entering the furnace is controlled and the particle size of the finer particles is adopted, so that the fuel particles can be uniformly distributed in the furnace under the conditions of lower smoke velocity and lower particle velocity, and the heat transfer of the upper part is not influenced;
4) the side wall of the lower part of the hearth, a material returning device, an external heat exchanger and other suitable positions are provided with a fine slag discharging port, the hearth bed pressure is controlled at a lower level, the stock of the circulating materials in the hearth tends to a conventional circulating fluidized bed boiler, and the abrasion is further reduced;
5) and a screen superheater is not arranged in the boiler, and a screen reheater is not arranged in the boiler for the boiler with reheating, so that the abrasion of a high-temperature level heating surface is prevented.
Drawings
Fig. 1 shows an overall schematic of an ultra high ash fuel fired circulating fluidized bed thermodynamic system arrangement according to an exemplary embodiment of the present invention.
Fig. 2 shows an overall schematic of an ultra high ash fuel fired circulating fluidized bed thermodynamic system arrangement according to another exemplary embodiment of the present invention.
Description of reference numerals:
1-hearth, 2-separation unit inlet flue, 3-separation unit, 4-feed back unit, 5-separation unit outlet flue, 6-tail flue, 7-external heat exchanger, 8-air distribution plate, 9-unequal cross section structure and 10-fine slag discharge port.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The circulating fluidized bed thermodynamic system arrangement for burning ultra-high ash fuel of the present invention is specifically described and illustrated below.
Fig. 1 shows an overall structure diagram of an arrangement structure of a circulating fluidized bed thermal system burning ultra-high ash fuel according to an exemplary embodiment of the present invention, and fig. 2 shows an overall structure diagram of an arrangement structure of a circulating fluidized bed thermal system burning ultra-high ash fuel according to another exemplary embodiment of the present invention.
As shown in fig. 1 and 2, according to an exemplary embodiment of the present invention, the circulating fluidized bed thermal system arrangement structure burning ultra-high ash fuel comprises a furnace 1, a separation unit inlet flue 2, a separation unit 3, a feed back unit 4, a separation unit outlet flue 5 and a tail flue 6, the furnace 1 is connected with the separation unit 3 through the separation unit inlet flue 2, the separation unit 3 is connected with the tail flue 6 through the separation unit outlet flue 5 and is connected with the furnace 1 through the feed back unit 4.
The specific process is as follows: the fuel is fed from a feeding port and then is combusted in the hearth 1, the generated high-temperature flue gas enters a separation unit 3 (such as a cyclone separator) through a separation unit inlet flue 2 for gas-solid separation, a material returning unit 4 is arranged below each separation unit, the material separated by the separation unit 3 returns to the hearth 1 through the material returning unit 4, and the hot flue gas subjected to gas-solid separation by the separation unit 3 enters a tail flue 6 through a separation unit outlet flue 5.
In order to realize the utility model discloses an aim at, the utility model discloses the partial furnace space that the circulating fluidized bed thermodynamic system arrangement structure's that fires super high ash content fuel furnace 1 middle distance distributor 815% H above region sets up to unequal cross-section structure 9, and the ratio α of the biggest sectional area in this unequal cross-section structure region satisfies 1 < α and is less than or equal to 2 with minimum sectional area, wherein, H is the height of distributor to the furnace roof in the furnace through this setting, make the bed material, great solid particle can't be carried to the furnace export by hot flue gas clamp in the fuel, thereby control the lower solid particle concentration in furnace upper portion, alleviate wearing and tearing effectively.
Preferably, a part of hearth space 15-50% H away from the air distribution plate in the hearth is set to be a non-uniform cross-section structure, so that the control of the solid particle concentration is facilitated, and the reduction of the abrasion is also facilitated. Furthermore, the air distribution plate of the utility model can be a single air distribution plate or a double air distribution plate.
Further, the utility model discloses in through suitably enlarging furnace sectional area to furnace section speed under the BMCR operating mode be 3 ~ 5m/s, can realize lower solid particle and smuggle the rate secretly, maintain the lower solid particle concentration in furnace upper portion.
In addition, the fuel particle size is strictly controlled and the finer particle size is adopted, so that the proper entrainment rate of the fuel particles in the furnace can be realized under the conditions of lower smoke velocity and lower particle velocity, and the heat transfer at the upper part is not influenced. When the ultrahigh ash fuel is stone coal, the grain size of the maximum fuel entering the furnace of the hearth is controlled within 6 mm.
The utility model discloses a circulating fluidized bed thermodynamic system arrangement structure can also include the over heater, nevertheless avoids the wearing and tearing of heating surface, does not arrange platen superheater in furnace 1. The utility model discloses a circulating fluidized bed thermodynamic system arrangement structure can also include still including the reheater, in order to avoid the wearing and tearing of heating surface, does not arrange the screen type reheater in furnace 1.
The utility model discloses a circulating fluidized bed thermodynamic system arrangement structure can dispose external heat exchanger 7, wherein, can arrange partly over heater in the external heat exchanger 7, also can arrange partly over heater and partly reheater according to the demand.
According to the utility model, the position between 8200 mm ~ H/2 apart from the grid plate and the feed back unit 4 department of the lateral wall of the lower part of the hearth 1 are provided with the fine slag discharge port 10. Through the arrangement of the fine slag discharge port, on one hand, the hearth bed pressure is controlled at a lower level, on the other hand, the stock of the circulating materials in the furnace is promoted to tend to the conventional circulating fluidized bed boiler, and the abrasion caused by overhigh particle concentration at the upper part of the hearth is prevented. In addition, when the utility model discloses dispose external heat exchanger 7, external heat exchanger 7 also is provided with the fine sediment discharge port to ensure that furnace bed pressure control is at lower level.
The invention will be further described with reference to specific embodiments.
Example 1:
the embodiment aims at the stone coal with the heat value of 1000 kilocalories and ash content of nearly 80 percent and SiO in the coal ash component
2The content exceeds 80 percent, and the fluidized bed boiler needs to realize the supercritical parameter of 350 MW.
The specific parameters of the fluidized bed boiler are shown in table 1 below.
Table 1 specific parameters of the fluidized bed boiler in example 1
As shown in fig. 1, the fluidized bed boiler in this embodiment is a single-hearth, single air distribution plate, balanced ventilation, single intermediate reheating, and circulating fluidized bed combustion mode. Wherein, the distance H from the air distribution plate to the furnace top is 40 m.
The furnace space in the area 9m to 14m away from the air distribution plate adopts a non-uniform cross-section structure, and the ratio of the maximum cross-section area to the minimum cross-section area of the area is controlled to be 1.5. And the section of the furnace 1 is properly enlarged to control the speed of the section of the furnace to be 4m/s under the BMCR working condition. The grain diameter of the stone coal entering the furnace is controlled within 6mm, so that fuel particles can be uniformly distributed in the furnace under the conditions of lower smoke velocity and lower particle velocity, and the heat transfer in the furnace is good.
The hot flue gas that fuel burning produced gives the water-cooling wall of furnace 1 with the heat transfer, get into the separation unit 3 through separation unit entry flue 2 and carry out gas-solid separation, separation unit 3 adopts high temperature cooling formula cyclone, every furnace 1 corresponds 4 cyclone, arrange in the both sides steelframe of furnace 1, all be furnished with feed back unit 4 under every cyclone, the material that is separated by cyclone is partly through feed back unit 4 direct return furnace 1, another part is then returned furnace 1 after external heat exchanger 7 again.
Each hearth 1 corresponds to 4 external heat exchangers 7 and is arranged in steel frames on two sides of each hearth 1, a high-temperature superheater and a high-temperature reheater are arranged in each external heat exchanger 7, and the outlet temperature of each external heat exchanger is controlled by controlling the flow of solid particles in each external heat exchanger 7. The hot flue gas after gas-solid separation by the cyclone separator enters a tail flue 6 through an outlet flue 5 of the separation unit.
Wherein, the position that the lateral wall of furnace 1 lower part apart from air distribution plate 8200 mm ~ 10m is equipped with a plurality of row's thin cinder notch, evenly arranges along back wall specific area, and every feed back unit all is equipped with row's thin cinder notch, and every external heat exchanger also is provided with row's thin cinder notch, guarantees that furnace bed pressure control is at lower level.
Example 2:
the embodiment aims at the stone coal with the heat value of 1000 kilocalories and ash content of nearly 80 percent and SiO in the coal ash component
2The content exceeds 80 percent, and the fluidized bed boiler needs to realize 600MW ultra-supercritical parameters.
The specific parameters of the fluidized bed boiler are shown in table 2 below.
Table 2 specific parameters of the fluidized bed boiler in example 2
| Name (R) | Unit of | BMCR operating mode number |
| Main steam flow | t/h | 2060 |
| Main steam outlet pressure | MPa(g) | 26.15 |
| Main steam outlet temperature | ℃ | 605 |
| Water supply temperature at the inlet of economizer | ℃ | 296 |
| Reheat steam flow | t/h | 1676.93 |
| Reheat steam inlet pressure | MPa(g) | 5.3 |
| Reheat steam inlet temperature | ℃ | 362 |
| Reheat steam outlet pressure | MPa(g) | 5.1 |
| Outlet temperature of reheat steam | ℃ | 603 |
As shown in fig. 2, the fluidized bed boiler in this embodiment is a single-hearth, double-air-distribution-plate, balanced ventilation, single intermediate reheating, and circulating fluidized bed combustion mode. Wherein, the distance H from the air distribution plate to the furnace top is 55 m.
The difference of this embodiment and embodiment 1 is that furnace is the pants type, is furnished with two air distribution plates, and because of the boiler evaporation capacity is big, the separation unit increases to 6, and external heat exchanger increases to 6. The rest of the structural arrangement in terms of reducing wear and taking into account heat transfer in the furnace is the same as in example 1.
By the system configuration of the embodiment 1 and the embodiment 2, lower hearth flue gas spelt can be realized, the particulate matter concentration is obviously reduced, the abrasion of a heating surface is effectively controlled, and the heat transfer in the furnace is considered. The effect of the above embodiment on the prior art is shown in table 1 below.
Table 1 comparison of the effects of example 1 and example 2 with the prior art
To sum up, the utility model discloses a burn circulating fluidized bed thermodynamic system arrangement structure of super high ash content fuel can maintain lower particle concentration and lower particle speed in the stove through above improvement, alleviates the heating surface wearing and tearing, compromises the stove simultaneously and conducts heat, ensures that the stove is interior to conduct heat evenly.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The circulating fluidized bed thermodynamic system arrangement structure is characterized in that partial furnace space in a region, more than 15% H, away from an air distribution plate in a furnace is set to be of a non-uniform cross-section structure, the ratio α of the maximum cross-section area to the minimum cross-section area in the region of the non-uniform cross-section structure meets the requirement that the ratio is more than 1 and less than or equal to α and less than or equal to 2, and H is the height from the air distribution plate in the furnace to the furnace top.
2. The arrangement structure of the thermodynamic system of the circulating fluidized bed burning ultra-high ash fuel of claim 1, wherein the partial furnace space in the furnace from 15% H to 50% H of the air distribution plate is arranged in a non-uniform cross-section structure, and the air distribution plate is a single air distribution plate or a double air distribution plate.
3. The circulating fluidized bed thermodynamic system arrangement structure combusting ultra-high ash fuel as claimed in claim 1, wherein the furnace sectional area is enlarged to a furnace sectional velocity of 3-5 m/s under BMCR condition.
4. The ultra-high ash fuel fired circulating fluidized bed thermodynamic system arrangement of claim 1, wherein when the ultra-high ash fuel is stone coal, the fired maximum fuel particle size of the furnace hearth is controlled to within 6 mm.
5. The ultra-high ash fuel-fired circulating fluidized bed thermal system arrangement structure of claim 1, comprising a furnace, a separation unit inlet flue, a separation unit outlet flue, a tail flue and a return unit, wherein the furnace is connected with the separation unit through the separation unit inlet flue, the separation unit is connected with the tail flue through the separation unit outlet flue and is connected with the furnace through the return unit, the circulating fluidized bed thermal system arrangement structure further comprises a superheater, and no platen superheater is arranged in the furnace.
6. The ultra-high ash fuel-fired circulating fluidized bed thermal system arrangement of claim 1 or 5, further comprising a reheater, wherein no reheater heating surface is disposed within the furnace.
7. The ultra-high ash fuel-fired circulating fluidized bed thermal system arrangement of claim 5, further comprising an external heat exchanger having a portion of a superheater disposed therein.
8. The ultra-high ash fuel-fired circulating fluidized bed thermal system arrangement of claim 6, further comprising an external heat exchanger within which a portion of the superheater and a portion of the reheater are disposed.
9. The arrangement structure of the thermodynamic system of a circulating fluidized bed burning ultra-high ash fuel of claim 7, wherein fine slag discharge ports are arranged at the position between 200 mm-H/2 of the lower side wall of the hearth and the air distribution plate and at the position of the feed back unit.
10. The ultra-high ash fuel-fired circulating fluidized bed thermodynamic system arrangement structure of claim 7 or 8, wherein the external heat exchanger is provided with a fine slag discharge port.
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| CN110094723A (en) * | 2019-05-15 | 2019-08-06 | 东方电气集团东方锅炉股份有限公司 | A kind of recirculating fluidized bed therrmodynamic system arragement construction for firing superelevation ash fuel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110094723A (en) * | 2019-05-15 | 2019-08-06 | 东方电气集团东方锅炉股份有限公司 | A kind of recirculating fluidized bed therrmodynamic system arragement construction for firing superelevation ash fuel |
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