CN104266179A - Limestone two-stage adding system for CFB (Circulating Fluid Bed) boiler - Google Patents

Limestone two-stage adding system for CFB (Circulating Fluid Bed) boiler Download PDF

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Publication number
CN104266179A
CN104266179A CN201410532376.7A CN201410532376A CN104266179A CN 104266179 A CN104266179 A CN 104266179A CN 201410532376 A CN201410532376 A CN 201410532376A CN 104266179 A CN104266179 A CN 104266179A
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CN
China
Prior art keywords
limestone
lime stone
batcher
lime
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410532376.7A
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Chinese (zh)
Inventor
张露璐
杨强
张加蓉
陈建华
朱瑾
金征
付焕兴
陈磊
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Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
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Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
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Publication date
Application filed by Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group filed Critical Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
Priority to CN201410532376.7A priority Critical patent/CN104266179A/en
Publication of CN104266179A publication Critical patent/CN104266179A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00Fluidised bed combustion apparatus
    • F23C10/18Details; Accessories

Abstract

The invention provides a limestone two-stage adding system for a CFB (Circulating Fluid Bed) boiler. The limestone two-stage adding system comprises a pneumatic conveying system connected and communicated with a limestone powder preparation system and a mechanical conveying system composed of a bucket type elevator, a limestone hopper and a feeder (3), wherein the bucket type elevator is used for outputting limestone to the limestone hopper; and the outlet end of the limestone hopper is connected and communicated with the feeding end of the feeder (3); the feeder (3) is driven by a feeder driving device (1), the discharge end of the feeder (3) is connected with a discharge pipeline (4), and the limestone outputted from the discharge pipeline (4) falls onto a coal conveying belt of a belt type conveyor (5). Due to the adoption of the limestone two-stage adding system, the type selection and the output of an original limestone power preparation system and an original pneumatic conveying system can be effectively reduced, the initial cost and the running expense of the limestone power preparation system and the pneumatic conveying system can be reduced, the energy-saving and consumption-reducing level of the CFB boiler can be improved; the limestone two-stage adding system has the outstanding advantages of simple structure, low investment cost, high reliability and the like.

Description

A kind of CFB boiler lime stone two-stage add-on system
Technical field
The present invention relates to CFB boiler technology field, especially relate to a kind of CFB boiler lime stone two-stage add-on system.
Background technology
CFB (English full name Circulating Fluidized-bed Boiler common at present, CFBB) boiler is coal boiler, in the boiler course of work, normal employing lime stone removes the sulphur composition in fire coal, to alleviate environmental pollution.
First the raw limestone of existing CFB boiler, normally utilize agstone preparation system to make agstone, then by air-transport system, agstone sent into boiler furnace.But because the sulfur content of part power plant fire coal used is high, being in great demand to agstone, therefore, lime stone consumption is larger, this must cause increase of exerting oneself, the type selecting difficulty of agstone preparation system and air-transport system, and the cost of investment of air-transport system itself compared with high, to run power consumption large, be unfavorable for energy-saving and cost-reducing and reduce the operating cost of CFB boiler.
Summary of the invention
The technical problem to be solved in the present invention is: for prior art Problems existing, provides a kind of CFB boiler lime stone two-stage add-on system, reduces the energy consumption of agstone preparation system and air-transport system, improves the economy of CFB boiler operatiopn.
The technical problem to be solved in the present invention realizes by the following technical solutions: a kind of CFB boiler lime stone two-stage add-on system, comprise the air-transport system that to be connected with agstone preparation system and to communicate and by bucket elevator, the mechanical conveying system of lime stone hopper and batcher composition, described bucket elevator exports lime building stones in lime stone hopper, described lime stone hopper outlet end is connected with batcher feeding end and communicates, described batcher is driven by batcher drive unit, its discharge end connects drainage line, the lime building stones exported from drainage line fall into the coal conveyer belt of ribbon conveyer.
Preferably, the connecting pipe between described lime stone hopper outlet end and batcher feeding end arranges gate.
Preferably, described gate is electric gate valve.
Preferably, described batcher adopts Weighing type batcher.
Preferably, described batcher drive unit adopts motor.
Preferably, the maximum particle diameter of lime building stones that described bucket elevator exports in lime stone hopper is less than or equal to 10mm.
Compared with prior art, the invention has the beneficial effects as follows: owing to adding lime stone mechanical conveying system on the basis of CFB boiler original conventional stage lime stone Geldart-D particle add-on system, this lime stone mechanical conveying system structure is simple, cost of investment is cheaper compared to the air-transport system of routine, and reliability is higher.Therefore, for the CFB boiler that lime stone consumption is larger, after adopting lime stone two-stage add-on system, the type selecting that effectively can reduce former agstone preparation system and air-transport system is exerted oneself, thus reduce initial cost and the operating cost of agstone preparation system and air-transport system, improve the energy-saving and cost-reducing level of CFB boiler.
Accompanying drawing explanation
Fig. 1 is the structural map of a kind of CFB boiler of the present invention lime stone two-stage add-on system.
Mark in figure: 1-batcher drive unit, 2-gate, 3-batcher, 4-drainage line, 5-ribbon conveyer.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of CFB boiler lime stone two-stage add-on system as shown in Figure 1, mainly comprise air-transport system and mechanical conveying system, mechanical conveying system wherein forms primarily of bucket elevator, lime stone hopper, batcher 3, at the feeding end of described batcher 3, discharge end, all pipeline coupling flange is set, described lime stone hopper outlet end is communicated with being connected by pipeline between batcher 3 feeding end, and lime stone hopper outlet end pipeline arranges a gate 2; Described batcher 3 is driven by batcher drive unit 1, the discharge end of batcher 3 connects drainage line 4, described drainage line 4 outlet is arranged in above the coal conveyer belt of the ribbon conveyer 5 of CFB coal delivery of boiler system, directly can drop into coal conveyer belt along drainage line 4 from the lime building stones of batcher 3 discharge end output.The lime building stones fallen on coal conveyer belt directly mix with the coal-fired powder on coal conveyer belt, are then delivered to boiler furnace by coal conveyer belt through feeder.Described air-transport system is connected by pipeline with agstone preparation system, boiler furnace respectively and communicates, lime building stones are first processed into powder through agstone preparation system, boiler furnace is delivered to again by air-transport system, both agstone material and fire coal Thorough combustion in boiler furnace had been conducive to, improve desulfurized effect and limestone utilization, powdered lime building stones are also convenient to Geldart-D particle simultaneously, are conducive to the energy consumption reducing air-transport system.
Above-mentioned batcher drive unit 1 can select motor, described gate 2 can select electronic coal gate, motor, electronic coal gate are convenient to by electrified control system centralized Control, so just can realize the electrification even Automated condtrol of CFB boiler lime stone two-stage add-on system, be conducive to saving manpower.Batcher 3 wherein can adopt Weighing type batcher, by the detection of weighing to lime building stones supply, the supply rate of lime building stones can be regulated easily, to improve the utilization rate entering the lime building stones of boiler furnace, improve the economy of CFB boiler operatiopn.
The present invention is applicable to the design of the larger CFB boiler lime stone handling system of lime stone consumption, the maximum particle diameter of the lime building stones that lime stone mechanical conveying system is wherein carried is less than or equal to 10mm, to ensure desulfuration efficiency higher in the Effec-tive Function of lime stone mechanical conveying system and CFB Boiler Furnace.If the limestone particle size of machinery conveying is excessive, the utilization rate of lime building stones in CFB boiler can be reduced, cause lime stone consumption to increase; If the limestone particle size of machinery conveying is too small, the agstone dust concentration of leakage may be caused in course of conveying to increase fast, thus cause larger potential safety hazard, also be unfavorable for environmental protection.Air-transport system is wherein the existing conventional scheme of CFB boiler controller system, the lime building stones carried need to carry out crushing grinding through agstone preparation system, the particle diameter of the agstone after grinding is at below 1mm, so that the efficient conveying of air-transport system.
The course of work of the mechanical conveying system increased is: first, adopts bucket elevator to be delivered to by lime building stones in lime stone hopper temporary; Secondly, when needs add lime building stones to boiler furnace, open gate 2, namely the lime building stones be in lime stone hopper drop on Weighing type batcher 3 by pipeline; Then, the lime building stones dropped on Weighing type batcher 3, under the driving effect of drive unit 1, are delivered to drainage line 4 by Weighing type batcher 3, and directly drop on the coal conveyer belt of ribbon conveyer 5 along drainage line 4; Finally, the lime building stones that coal-fired powder on coal conveyer belt falls on coal conveyer belt mix with the coal-fired powder on coal conveyer belt, and be delivered to boiler furnace by coal conveyer belt through feeder, wherein, the coal-fired powder on described coal conveyer belt is delivered on coal conveyer belt by thin coal breaker as shown in Figure 1.
Compared with only adopting the one-level lime stone Geldart-D particle add-on system of routine, the present invention utilizes the air-transport system of original routine except boiler furnace conveying lime building stones except continuing, also increasing utilizes mechanical conveying system to CFB boiler furnace adding portion lime building stones, so not only can reduce the lime stone consumption of air-transport system conveying, reduce exerting oneself of agstone preparation system and air-transport system, be conducive to the Selection and Design of agstone preparation system and air-transport system, and significantly reduce initial cost and the operating cost of agstone preparation system and air-transport system, be conducive to the energy-saving and cost-reducing level improving CFB boiler.In addition, due to the mechanical conveying system simple structure increased, easy to maintenance, it is cheaper compared to the initial cost cost of air-transport system, reliability is also higher, not only can ensure the lime stone consumption needed for CFB boiler, also effectively can reduce the cost of investment of CFB boiler, thus effectively improve the economy of CFB boiler operatiopn.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, it should be pointed out that all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a CFB boiler lime stone two-stage add-on system, comprise and be connected with agstone preparation system the air-transport system communicated, it is characterized in that: also comprise by bucket elevator, the mechanical conveying system that lime stone hopper and batcher (3) form, described bucket elevator exports lime building stones in lime stone hopper, described lime stone hopper outlet end is connected with batcher (3) feeding end and communicates, described batcher (3) is driven by batcher drive unit (1), its discharge end connects drainage line (4), the lime building stones exported from drainage line (4) fall into the coal conveyer belt of ribbon conveyer (5).
2. CFB boiler lime stone two-stage add-on system according to claim 1, is characterized in that: the connecting pipe between described lime stone hopper outlet end and batcher (3) feeding end is arranged gate (2).
3. CFB boiler lime stone two-stage add-on system according to claim 2, is characterized in that: described gate (2) is electric gate valve.
4. the lime stone two-stage add-on system of the CFB boiler according to any one of claim 1-3, is characterized in that: described batcher (3) adopts Weighing type batcher.
5. the lime stone two-stage add-on system of the CFB boiler according to any one of claim 1-3, is characterized in that: described batcher drive unit (1) adopts motor.
6. the lime stone two-stage add-on system of the CFB boiler according to any one of claim 1-3, is characterized in that: the maximum particle diameter of the lime building stones that described bucket elevator exports in lime stone hopper is less than or equal to 10mm.
CN201410532376.7A 2014-10-11 2014-10-11 Limestone two-stage adding system for CFB (Circulating Fluid Bed) boiler Pending CN104266179A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776425A (en) * 2015-04-17 2015-07-15 贵州电力试验研究院 Over-temperature prevention device for CFB (circulating fluid bed) boiler after addition and burning of peat and control method of over-temperature prevention device
CN106731944A (en) * 2016-12-29 2017-05-31 华中科技大学 A kind of adsorbent add-on system for Particulates from Coal Combustion emission reduction

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CN202725020U (en) * 2012-04-26 2013-02-13 上海美亚金桥能源有限公司 Calcium carbonate composite addition dry desulfurization system of circulating fluidized bed boiler (CFBB)
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CN204084347U (en) * 2014-10-11 2015-01-07 中国电力工程顾问集团西南电力设计院 A kind of CFB boiler lime stone two-stage add-on system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776425A (en) * 2015-04-17 2015-07-15 贵州电力试验研究院 Over-temperature prevention device for CFB (circulating fluid bed) boiler after addition and burning of peat and control method of over-temperature prevention device
CN106731944A (en) * 2016-12-29 2017-05-31 华中科技大学 A kind of adsorbent add-on system for Particulates from Coal Combustion emission reduction
CN106731944B (en) * 2016-12-29 2019-10-08 华中科技大学 A kind of adsorbent add-on system for Particulates from Coal Combustion emission reduction

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Free format text: CORRECT: APPLICANT; FROM: SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION TO: CHINA POWER ENGINEERING CONSULTING GROUP SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD.

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Application publication date: 20150107

RJ01 Rejection of invention patent application after publication