CN207378806U - A kind of coal-fired boiler combustion runtime - Google Patents
A kind of coal-fired boiler combustion runtime Download PDFInfo
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- CN207378806U CN207378806U CN201720773431.0U CN201720773431U CN207378806U CN 207378806 U CN207378806 U CN 207378806U CN 201720773431 U CN201720773431 U CN 201720773431U CN 207378806 U CN207378806 U CN 207378806U
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Abstract
The utility model discloses a kind of coal-fired boiler combustion runtime, including feeding belt, batcher, gasification furnace, cyclone separator, gas-gas heat exchanger, reducing zone gas pipeline, main burning area gas pipeline；Feeding belt is connected by batcher with gasification furnace；The gas of gasification furnace generation is entered by reducing zone gas pipeline and main burning area gas pipeline in the burner hearth of coal-burning boiler respectively through gas-gas heat exchanger；Reducing zone gas pipeline, main burning area gas pipeline each lead into the reducing zone of burner hearth, main burning area；Electrically operated valve is equipped on reducing zone gas pipeline, main burning area gas pipeline.The utility model burning runtime sprays into assistant coal burning in burner hearth using biomass gasified gas, is not only able to avoid the fouling and slagging and etching problem of burner hearth, additionally it is possible to significantly reduce SO2With the concentration of emission of NOx, unburned carbon in flue dust is reduced, realizes that the high-grade of low-grade biomass energy utilizes.
Description
Technical field
The utility model belongs to power domain, and in particular to a kind of coal-burning boiler carries out the device surely fired for a long time.
Background technology
As coal resources are increasingly deficient and the market price is increasingly soaring, coal-fired cost accounted for the 70% of cost of electricity-generating with
On, in order to ensure fuel normal supply and reduce fuel cost, most coal-burning power plant's coal as received matter far inferior to boiler design coal quality,
Boiler operatiopn is caused, especially in low load stage, unstable combustion even boiler extinguishment problem often to occur there are problems.
At present, to meet coal-burning boiler low-load combustion-stabilizing needs, be substantially all be equipped with big oil gun, it is micro- oil or one kind in plasma or
A variety of corollary apparatus, these configurations meet boiler low load stable combustion requirement, but operation and maintenance cost is higher, and fuel system
It needs to be equipped with corresponding fire-fighting system, especially oil price lattice amount of increase is larger in recent years, and most power plant take many means control combustions
Oil mass, to achieve the purpose that control cost.In short, fuel system is costly and security risk is more；Later plasma ignition is in electricity
Factory tests successfully, and plasma ignition system solves security risk existing for fuel system, and need not be equipped with corresponding fire-fighting
System, but plasma cathode head only has the service life of tens hours, as the sluggish and each electricity power group of electricity market is to machine
The requirement of group operational flexibility, long-term underload will become normality, and it is clearly not to carry out long-term steady combustion using plasma oil gun
Desirable method.
The content of the invention
The purpose of this utility model is to solve defect in the prior art, provides one kind at low cost, Neng Gouchang
The device that phase surely fires.
In order to achieve the above object, the utility model provides a kind of coal-fired boiler combustion runtime, including feeding skin
Band, batcher, gasification furnace, cyclone separator, gas-gas heat exchanger, reducing zone gas pipeline, main burning area gas pipeline；Feeding skin
Band is connected by batcher with gasification furnace；The gas of gasification furnace generation passes through reducing zone gas pipeline respectively through gas-gas heat exchanger
Enter with main burning area gas pipeline in the burner hearth of coal-burning boiler；Reducing zone gas pipeline, main burning area gas pipeline lead to respectively
Enter reducing zone, the main burning area of burner hearth；Electrically operated valve is equipped on reducing zone gas pipeline, main burning area gas pipeline.
Wherein, multiple reducing zone combustion gas spouts are equipped at the reducing zone of coal-burning boiler burner hearth；Reducing zone combustion gas spout with
Reducing zone gas pipeline is connected.
Reducing zone combustion gas spout is uniformly distributed in the reducing zone of the coal-burning boiler burner hearth；Main burning area gas pipeline and stove
Main burner spout is connected in thorax.
The flue gas of the stove chamber inner combustion output of coal-burning boiler passes sequentially through pendant superheater, finishing superheater, cryogenic overheating
Device, economizer, air preheater, deduster and air-introduced machine, then after gas-gas heat exchanger, into the gasification furnace wind of gasification furnace
Room.
Gasification stream gauge is equipped between cyclone separator and gas-gas heat exchanger；It is equipped between air-introduced machine and gas-gas heat exchanger
Flue gas flow meter.
Reducing zone gas pipeline and main burning area gas pipeline are connected respectively with facing stove, and connecting place, which is equipped with, faces stove closing
Valve.
The utility model has the following advantages compared with prior art：
1st, the utility model utilizes biomass gasification technology, generates gasification pneumatic transmission and enters in burner hearth, carries out coal-fired auxiliary combustion,
It is not only able to avoid the fouling and slagging and etching problem of burner hearth, additionally it is possible to significantly reduce SO2With the concentration of emission of NOx, reduce and fly
Grey phosphorus content realizes that the high-grade of low-grade biomass energy utilizes.
2nd, in underload section, partial fuel coal is substituted by biomass gasified gas and is directly sprayed by main burner in burner hearth, it can
With replacing fuel oil system and plasma system, as a kind of new low-load combustion-stabilizing mode, the steady of boiler at low load operation is improved
Qualitative, this external enwergy increases exhaust gas volumn（The exhaust gas volumn that biomass gasified gas burning generates is that calorific values coal dust firing is waited to generate exhaust gas volumn
5-8 times）, increase the caloric receptivity of convection heating surface, improve final stage vapor (steam) temperature.Biomass sulfur content itself is low simultaneously, utilizes
Biogas substitutes partial fuel coal, can effectively reduce desulphurization system entrance SO2Concentration reduces the expense of desulphurization system operation.
3rd, in middle and high load section, biomass gasified gas is sprayed into from reducing zone in burner hearth, biogas is carried out and fires again, it can
With the NO for generating main burner areaxIt is reduced in reducing zone, is equivalent on the basis of air classification and has carried out burning point
Grade, had both reduced the fire box temperature in main burner area, and had reduced thermal NOxGeneration, while reducing zone spray into secondary fuel
Biomass gasified gas adds reducing zone reducing substances（CO、H2、CH4、CmHn）Concentration so that more NOxIt is reduced into
N2, significantly reduce furnace outlet NOxConcentration, denitrating system ammonia spraying amount are accordingly reduced, and the escaping of ammonia is also reduced therewith, to a certain degree
On reduce air preheater blocking risk.
4th, the utility model is smaller to the transformation of existing coal-fired boiler combustion system, at low cost, integral combustion runtime
By biomass gas reutilization technology, it is extensive, efficiently sharp to not only solve biomass energy for simple in structure and non-secondary pollution
Problem, and realize low-load combustion-stabilizing and middle and high load fires the low NO of heat drop againxPurpose.Simultaneously after gasification of biomass
It can be sold through the substantial amounts of biomass ash at cyclone separator separation as bio-fertilizer, the economic receipts of power plant can be increased
Benefit.
5th, the utility model can improve boiler low load stable combustion energy by using the mode of biogas and coal cofiring
Power, make boiler do not thrown when reaching more underload oil or plasma and can stable operation, can be used as unit realization depth peak regulation one
Kind approach.
Description of the drawings
Fig. 1 is the structure diagram of the utility model coal-fired boiler combustion runtime；
Fig. 2 is the structure diagram in burner hearth in Fig. 1；
Fig. 3 is the distribution schematic diagram of gas injection mouth in burner hearth in Fig. 2；
Fig. 4 is another distribution schematic diagram of gas injection mouth in burner hearth in Fig. 2.
In figure, 1- burner hearths, 2- air preheaters, 3- dedusters, 4- air-introduced machines, 5- flue gas flow meters, 6- mixed gas flows
Meter, 7- gasification furnaces, 8- feeding belts, 9- batchers, 10- gasification furnace air compartments, 11- cyclone separators, 12- gasification stream gauge,
13- augers, 14- gas-gas heat exchangers, 15- reducing zones gas pipeline, 16- main burner gas pipelines, 17- reducing zones gas pipeline
Valve, 18- main burner burnt gas valves, 19- fire air nozzles, 20- reducing zones combustion gas spout, 21- main burner combustion gas spouts, 22
Pendant superheater, 23- finishing superheaters, 24- final reheaters, 25- low temperature superheaters, 26- economizers, 27- face stove shut-off valve.
Specific embodiment
The utility model is described in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the utility model coal-fired boiler combustion runtime is transformed existing coal-burning boiler, including stove
The biomass gasified gas generating means being equipped with outside thorax, the biomass of bundling processing are delivered to batcher 9 by belt conveyor 8,
Subsequently into gasification furnace 7, while gasifying medium enters gasification furnace 7, biomass gasification production in gasification furnace 7 by gasification furnace air compartment 10
Raw biomass gasified gas enters cyclone separator 11, most biomass ash under separation, uncombusted biomass ash and point
The auger 13 set from the bed material particle to get off by lower part is delivered to again in gasification furnace 7, and biomass gasified gas is changed through gas gas
400 DEG C or so are cooled to after hot device 14, is passed through in burner hearth 1 and carries out auxiliary combustion.
Periodically in underload section（Load is less than 50%BMCR operating modes）, come by the conveying of multiple main burner gas pipelines 16
About 400 DEG C of biomass gasified gas after ash disposal and cooling, according to the yield of biomass gasified gas, control main burner combustion gas
Valve 18 is fully or partially opened, and gas is injected to by main burner combustion gas spout 21 in burner hearth 1, is substituted part coal dust and is fired
It burns, coal dust intake and biomass gasified gas intake heat control ratio as 1:60~1:20.Biomass gasified gas can simultaneously
It is sprayed by 21 center combustion gas spout of main burner spout.
In middle and high load stage（50% ~ 100%BMCR operating modes）, the warp to come is conveyed by multiple reducing zone gas pipelines 15
About 400 DEG C of biomass gasified gas after cooling down are crossed out after ash disposal, flow is controlled by respective reducing zone gas pipeline valve 17, is passed through
The penetrating burner hearth 1 of reducing zone combustion gas spout 20 is arranged in burn.
As shown in Fig. 2, pass through pendant superheater 22, finishing superheater 23, final stage successively in the flue gas that hearth combustion generates
Reheater 24, low temperature superheater 25, economizer 26 and air preheater 2 subsequently into deduster 3, most enter through air-introduced machine 4 afterwards
Desulphurization system and chimney.
Purified neat stress, by mixed airflow gauge 6, is passed through gas gas after flue gas flow meter 5 is mixed with First air
In heat exchanger 14, through biomass gasified gas（After 11 dedusting of cyclone separator, about 600 DEG C）After heating, into the gasification of gasification furnace 7
In stove air compartment 10, it can improve into stove wind-warm syndrome to 400 DEG C~450 DEG C, improve the rate of gasification and fuel gases calorific value of gasification furnace, reduce simultaneously
Biomass gasified gas temperature makes it meet requirement of the combustion gas suction ventilator to temperature, can also reduce combustion gas spout to 400 DEG C or so
Area.
Under the method for operation of underload section, face stove shut-off valve 27, reducing zone gas pipeline valve 17 keeps full off state.It should
Kind biogas Land use systems can solve unstable combustion during boiler at low load operation in the case where not throwing oil or plasma
Problem, while can meet long-time underload stable operation, had both saved oil firing or the expense for the plasma power consumption generation that comes into operation,
Also solve the problems, such as that plasma cannot continuously be run for a long time.
In middle and high load section, the coal dust and Secondary Air and reducing zone gas injection of the penetrating burner hearth 1 of main burner combustion gas spout 21
Mouth 20 sprays into biomass gasified gas primary combustion in stove of burner hearths, uncombusted coke and fuel gas and fire air nozzle 19
The burnout degree of penetrating carries out mixing after-flame.Under the method for operation, face stove shut-off valve 27, main burner burnt gas valve 18 keeps fully closed
Or part is closed.The intake heat ratio for controlling biomass gasified gas and coal dust is：1:10-3:20.This kind of biogas profit
The NO that main burner area can be generated with modexIt is reduced in reducing zone, is equivalent to and is carried out on the basis of air classification
Burning classification, had both reduced the fire box temperature in main burner area, reduces thermal NOxGeneration, while reducing zone spray into
Secondary fuel biomass gasified gas adds reducing zone reducing substances（CHi and CO）Concentration so that more NOxReduction
Into N2, significantly reduce furnace outlet NOxConcentration, denitrating system ammonia spraying amount are accordingly reduced, and the escaping of ammonia is also reduced therewith, certain journey
The risk of air preheater blocking is reduced on degree.
20 flexible arrangement of reducing zone combustion gas spout can unanimously be arranged in front-back wall with main burner combustion gas spout 21（Such as Fig. 3
It is shown）, both walls can also be arranged according to field condition.As shown in figure 3, when reducing zone combustion gas spout 20 is arranged in front-back wall
When, it is consistent with main burner combustion gas spout 21 with 20 quantity of layer reducing zone combustion gas spout and level interval, it is arranged in top layer master
Region between burner combustion gas spout 21 and fire air nozzle 19 is distributed according to 20 uniform amount of reducing zone combustion gas spout；Such as
Shown in Fig. 4, when reducing zone combustion gas spout 20 is arranged in both walls, arrangement height is consistent in front-back wall, and spacing is according to spray
Mouth uniform amount distribution.
When emergency or furnace shutting down process occurs in boiler, opening faces stove shut-off valve 27, biogas is transported to face stove into
Row burning, does not influence the continuous operation of gasification furnace.
Claims (6)
1. a kind of coal-fired boiler combustion runtime, it is characterised in that：Including feeding belt, batcher, gasification furnace, cyclonic separation
Device, gas-gas heat exchanger, reducing zone gas pipeline, main burning area gas pipeline；The feeding belt passes through batcher and gasification furnace
It is connected；The gas of gasification furnace generation through gas-gas heat exchanger, respectively by reducing zone gas pipeline and main burning area gas pipeline into
Enter in the burner hearth of coal-burning boiler；The reducing zone gas pipeline, main burning area gas pipeline each lead into the reduction of the burner hearth
Area, main burning area；Electrically operated valve is equipped on the reducing zone gas pipeline, main burning area gas pipeline.
2. coal-fired boiler combustion runtime according to claim 1, it is characterised in that：The coal-burning boiler burner hearth is gone back
Multiple reducing zone combustion gas spouts are equipped at former area；The reducing zone combustion gas spout is connected with the reducing zone gas pipeline.
3. coal-fired boiler combustion runtime according to claim 2, it is characterised in that：The reducing zone combustion gas spout is equal
The even reducing zone for being distributed in the coal-burning boiler burner hearth；Main burning area gas pipeline is connected with main burner spout in burner hearth
It is logical.
4. coal-fired boiler combustion runtime according to claim 3, it is characterised in that：In the burner hearth of the coal-burning boiler
The flue gas of burning output passes sequentially through pendant superheater, finishing superheater, low temperature superheater, economizer, air preheater, dedusting
Device and air-introduced machine, then after the gas-gas heat exchanger, into the gasification furnace air compartment of the gasification furnace.
5. coal-fired boiler combustion runtime according to claim 4, it is characterised in that：The cyclone separator and gas gas
Gasification stream gauge is equipped between heat exchanger；Flue gas flow meter is equipped between the air-introduced machine and gas-gas heat exchanger.
6. coal-fired boiler combustion runtime according to claim 5, it is characterised in that：The reducing zone gas pipeline and
Main burning area gas pipeline is connected respectively with facing stove, and connecting place, which is equipped with, faces stove closing valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720773431.0U CN207378806U (en) | 2017-06-29 | 2017-06-29 | A kind of coal-fired boiler combustion runtime |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720773431.0U CN207378806U (en) | 2017-06-29 | 2017-06-29 | A kind of coal-fired boiler combustion runtime |
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| Publication Number | Publication Date |
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| CN207378806U true CN207378806U (en) | 2018-05-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120639A (en) * | 2017-06-29 | 2017-09-01 | 南京电力设备质量性能检验中心 | A kind of coal-fired boiler combustion operation method and burning runtime |
| CN108534175A (en) * | 2018-06-11 | 2018-09-14 | 大唐环境产业集团股份有限公司 | A kind of coal-burning boiler plasma gasification ignition smooth combustion apparatus and method |
| CN109028037A (en) * | 2018-06-06 | 2018-12-18 | 大唐长山热电厂 | The method that the device and biogasification gas and coal dust being mixed and burned for biogasification gas and coal dust are mixed and burned |
| CN109735371A (en) * | 2019-02-13 | 2019-05-10 | 浙江大学 | A kind of biomass circulating fluidized bed direct-combustion boiler and its with gasification furnace coupled electricity-generation co-producing active carbon system |
| CN110129100A (en) * | 2019-05-28 | 2019-08-16 | 彭万旺 | Highly effective combustion system and method |
-
2017
- 2017-06-29 CN CN201720773431.0U patent/CN207378806U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120639A (en) * | 2017-06-29 | 2017-09-01 | 南京电力设备质量性能检验中心 | A kind of coal-fired boiler combustion operation method and burning runtime |
| CN109028037A (en) * | 2018-06-06 | 2018-12-18 | 大唐长山热电厂 | The method that the device and biogasification gas and coal dust being mixed and burned for biogasification gas and coal dust are mixed and burned |
| CN108534175A (en) * | 2018-06-11 | 2018-09-14 | 大唐环境产业集团股份有限公司 | A kind of coal-burning boiler plasma gasification ignition smooth combustion apparatus and method |
| CN108534175B (en) * | 2018-06-11 | 2023-10-10 | 大唐环境产业集团股份有限公司 | Plasma gasification ignition stable combustion device and method for coal-fired boiler |
| CN109735371A (en) * | 2019-02-13 | 2019-05-10 | 浙江大学 | A kind of biomass circulating fluidized bed direct-combustion boiler and its with gasification furnace coupled electricity-generation co-producing active carbon system |
| CN110129100A (en) * | 2019-05-28 | 2019-08-16 | 彭万旺 | Highly effective combustion system and method |
| CN110129100B (en) * | 2019-05-28 | 2023-12-22 | 彭万旺 | Efficient combustion system and method |
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Address after: 210033 Qixia, Jiangsu Province, Wonderland Road, No. 10, Patentee after: Guodian Nanjing electric power test & Research Co., Ltd. Address before: 210033 Qixia, Jiangsu Province, Wonderland Road, No. 10, Patentee before: Nanjing Power Equipment Quality & Performance Test Center |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210033 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Address before: 210033 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. |