CN101251250B - Circulating fluidized bed boiler with double-furnace structure - Google Patents
Circulating fluidized bed boiler with double-furnace structure Download PDFInfo
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- CN101251250B CN101251250B CN200810023832XA CN200810023832A CN101251250B CN 101251250 B CN101251250 B CN 101251250B CN 200810023832X A CN200810023832X A CN 200810023832XA CN 200810023832 A CN200810023832 A CN 200810023832A CN 101251250 B CN101251250 B CN 101251250B
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- waste residue
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- boiler
- furnace hearth
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Abstract
The invention relates to a double-furnace structure for a fluidized-bed waste residue boiler, which mainly comprises a fluidized-bed boiler furnace body, a coal-fired furnace hearth consists of a water wall tube and an immersed tube heating surface; a trough separator is arranged on the water wall tube of the coal-fired furnace hearth; a convection bank is arranged between an upper drum and a lower drum, a dropping ash bucket is connected to the lower part of the convection bundle, an economizer is arranged on the lower part of the lower drum. The invention is characterized in that: a waste residue burning furnace hearth is arranged in front of the coal-fired furnace hearth, an incinerator blowing wind box is arranged on the waste residue burning furnace hearth; the waste residue burning furnace hearth is communicated with the coal-fired furnace hearth. A waste residue feeding port, a waste residue discharging port and the incinerator blowing wind box are arranged on the waste residue burning furnace hearth. Two simultaneously arranged furnace hearths respectively burn coals and low heating value waste residue which can be burned sufficiently; the double-furnace structure can flexibly adjust the rate of the coal used by the boiler and waste residue according to the quantity of the waste residue, even if when the waste residue is stopped transporting, a coal combustion chamber still operates normally, so as to ensure that fuel gas is supplies to the boiler with full load.
Description
Technical field
The present invention relates to a kind of CFBB of double-furnace structure, the SZL type recirculating fluidized bed boiler using waste slag of two kinds of fuel (coal and the another kind of low heat value waste residue) that specifically be applied to burn.
Background technology
CFBB is a kind of common boiler plant, grows up from bubbling bed fluidized bed furnace; Compare with chain-grate boiler with coal-powder boiler, have characteristics such as fuel tolerance is wide, boiler thermal output is high, load regulation range is big, utilization of ash and slag property is good, obtained using widely at boiler industry.SZL type (promptly two drum longitudinal) CFBB is a kind of of many CFBB forms; It is simple in structure; Fuel tolerance is wide; Not only can burn coal, and can mix under the condition of burning coal, various biomass fuels and some more low-calorie factory wastes, mud etc. burn.SZL type fluidized-bed combustion boiler comprises compositions such as burner hearth, last lower drum and convection bank, grooved separator, economizer, combustion apparatus, and it has adopted than the higher fluidizing velocity of bubbling bed fluidized bed furnace; During operation; Fuel carries out fluidized bed combustion in burner hearth; A large amount of materials high-temperature flue gas that produces that burnt is carried down upper furnace secretly, passes through the grooved separator that is arranged in the furnace outlet place, and wherein the material of larger particles is come out by the grooved separator separates; Water-cooling wall falls behind the burner hearth, gets back to and continues to participate in burning in the bed.Boiler feedwater gets into upper drum through the feedwater operating platform after the economizer heating; Saturation water in the upper drum through down-comer, gets into furnace wall cooling next part case through convection bank, lower drum, is heated the back through furnace wall cooling again and gets into upper drum; After water separator separated, drew through the steam fairlead by saturated vapor in upper drum for the mixture of saturation water and saturated vapor.The boiler of this type in the shortcoming aspect the burning is: when boiler need be mixed when burning another kind of low heat value waste residue; Be that coal and low heat value waste residue are added single burner hearth internal combustion as fuel combination together generally speaking, owing to be furnished with more evaporating heating surface in the burner hearth, fractional cold is bigger; The burning of waste residue is not thorough; Efficiency of combustion is low, and the harmful substance that the waste residue burning is produced is thoroughly decomposed, and has caused the pollution of atmosphere; On the other hand, the mixed combustion in a burner hearth of waste residue and coal in order to guarantee combustion efficiency, must be added the coal of larger proportion during boiler operatiopn, so the adding proportion controllability of waste residue and coal is little, the economy of boiler overall operation is relatively poor.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, thereby a kind of CFBB of double-furnace structure is provided, it is provided with two burner hearths simultaneously, and coal combustion and low heat value waste residue fully burn it respectively; Can come the ratio of flexible steam coal and waste residue according to the amount of waste residue, even coal combustion chamber still can normally move when the waste residue stove is stopped transport, to guarantee boiler steam supply at full capacity.
Main solution of the present invention is achieved in that
The present invention includes the fluidized-bed combustion boiler body of heater, constitute coal-fired furnace cavity by water screen tube and pipe laying heating surface; On the furnace outlet water screen tube, arrange the grooved separator; Between upper drum and lower drum, arrange convection bank, ash dropping hopper is connected the convection bank below, and economizer is arranged on the lower drum below; Characteristic is in coal-fired furnace cavity the place ahead the refuse destructor furnace thorax to be set, and on the refuse destructor furnace thorax, arranges refuse destructor furnace thorax plenum chamber; The refuse destructor furnace thorax is communicated with coal-fired furnace cavity.
Be furnished with waste residue material inlet and waste residue slag-drip opening and refuse destructor furnace thorax plenum chamber on the described refuse destructor furnace thorax.
Compared with present technology the present invention has the following advantages:
The present invention is simple, compact and reasonable for structure; On the basis of the SZL of single chamber structure type fluid bed boiler using waste slag; Set up a refuse destructor furnace thorax again; Special combustion low heat value waste material separates low heat value waste material and coal, coal as single-fuel in former burner hearth internal combustion; The high-temperature flue gas of the two generation mixes in upper furnace, the heating surface of the boiler of flowing through successively again; Because boiler is furnished with enough height, high-temperature flue gas is stopped in burner hearth surpass 2 second time, harmful substance is thoroughly decomposed, meet the environmental protection standard requirement that waste residue burns fully.The refuse destructor furnace thorax adopts all-sealed structure, and firing efficiency is very high, and is also very good to the conformability of low heat value waste residue.Because the combustion system of coal and low heat value waste residue is relatively independent, make it can satisfy the requirement that useless low heat value slag burns fully, and the ratio that can come flexible coal and low heat value waste residue according to the amount of hanging down waste residue, have better economic property; Even coal combustion chamber also can normally move when the refuse destructor furnace thorax was stopped transport, still can guarantee boiler steam supply at full capacity.
Description of drawings
Fig. 1 is the cutaway view of front view of the present invention.
Fig. 2 is that the A-A of Fig. 1 is to cutaway view.
The specific embodiment
Following the present invention will combine the instance in the accompanying drawing to further describe:
The present invention mainly is made up of waste residue material inlet 1, refuse destructor furnace thorax 2, waste residue slag-drip opening 3, refuse destructor furnace thorax plenum chamber 4, water screen tube 5, grooved separator 6, upper drum 7, convection bank 8, lower drum 9, economizer 10, coal feeding hole 11, pipe laying heating surface 12, ash dropping hopper 13, coal-fired furnace cavity plenum chamber 14, down-comer 15, boiler furnace 16 and coal-fired furnace cavity 17 etc.
The present invention mainly comprises circulating fluid bed boiler body 16, constitutes coal-fired furnace cavity 17 by water screen tube 5 and pipe laying heating surface 12.Coal feeding hole 11 and coal-fired furnace cavity plenum chamber 14 are set on coal-fired furnace cavity 17; Down-comer 15 is connected coal-fired furnace cavity 17 belows.Grooved separator 6 is set on water screen tube 5; Ash dropping hopper 13 is connected convection bank 8 belows through pipeline, between upper drum 7 and lower drum 9, convection bank 8 is set, and economizer 10 is arranged on lower drum 9 belows.A refuse destructor furnace thorax 2 is set before coal-fired furnace cavity 17, is furnished with waste residue material inlet 1, waste residue slag-drip opening 3 and incinerator plenum chamber 4 on the refuse destructor furnace thorax 2; The upper drum 7 and two side walls of fluidized-bed combustion boiler are suitably extended forward, constitute the exhaust pass of refuse destructor furnace thorax, refuse destructor furnace thorax 2 is communicated with coal-fired furnace cavity 17 through exhaust pass; The high-temperature flue gas that refuse destructor furnace thorax 2 the produces exhaust pass of flowing through directly feeds the high-temperature flue gas that coal-fired fluidized bed boiler and coal-fired furnace cavity 17 produce and mixes in upper furnace, flows through other heating surface of boiler more successively; The heat that the burning of coal and waste residue is produced is fully used, and the efficiency of combustion of waste residue and burn-off rate also are improved.
The present invention is owing to set up a refuse destructor furnace thorax, special combustion low heat value waste residue, coal as single-fuel in former coal-fired furnace cavity 17 internal combustion.Refuse destructor furnace burner hearth 2 adopts the two-stage combustion design, and turbulence type pyrolytic incineration, 800～900 ℃ of ignition temperatures are adopted in the one-level burning; Secondary firing makes the unburned gas after-flame, and reaches 900～1000 ℃ of combustion high temperature for the combustion of spiral-flow type mixing chamber; This TV station boiler is furnished with enough height, high-temperature flue gas is stopped in burner hearth surpass 2 second time, and harmful substance is thoroughly decomposed, and meets guarantor's standard-required that waste residue burns ring fully.Through practice test, this double-furnace structure is practical and efficient.
Claims (2)
1. the CFBB of a double-furnace structure comprises boiler furnace (16), constitutes coal-fired furnace cavity (17) by water screen tube (5) and pipe laying heating surface (12); Grooved separator (6) is set on water screen tube (5); Ash dropping hopper (13) is connected convection bank (8) below through pipeline, between upper drum (7) and lower drum (9), convection bank (8) is set, and economizer (10) is arranged on lower drum (9) below; It is characterized in that refuse destructor furnace thorax (2) being set, go up at refuse destructor furnace thorax (2) and arrange refuse destructor furnace thorax plenum chamber (4) in coal-fired furnace cavity (17) the place ahead; Refuse destructor furnace thorax (2) is communicated with coal-fired furnace cavity (17).
2. the CFBB of double-furnace structure according to claim 1 is characterized in that being furnished with on the described refuse destructor furnace thorax (2) waste residue material inlet (1) and waste residue slag-drip opening (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810023832XA CN101251250B (en) | 2008-04-17 | 2008-04-17 | Circulating fluidized bed boiler with double-furnace structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810023832XA CN101251250B (en) | 2008-04-17 | 2008-04-17 | Circulating fluidized bed boiler with double-furnace structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101251250A CN101251250A (en) | 2008-08-27 |
| CN101251250B true CN101251250B (en) | 2012-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810023832XA Expired - Fee Related CN101251250B (en) | 2008-04-17 | 2008-04-17 | Circulating fluidized bed boiler with double-furnace structure |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900327B (en) * | 2010-09-08 | 2011-06-22 | 山东希尔生物质能源有限公司 | Biomass fuel inner circulation mechanical fluidized bed corner tube boiler |
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- 2008-04-17 CN CN200810023832XA patent/CN101251250B/en not_active Expired - Fee Related
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| CN101251250A (en) | 2008-08-27 |
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