CN105444144A - 300MWCFB boiler and distribution method for oil shale for combustion - Google Patents

300MWCFB boiler and distribution method for oil shale for combustion Download PDF

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Publication number
CN105444144A
CN105444144A CN201510983680.8A CN201510983680A CN105444144A CN 105444144 A CN105444144 A CN 105444144A CN 201510983680 A CN201510983680 A CN 201510983680A CN 105444144 A CN105444144 A CN 105444144A
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CN
China
Prior art keywords
burner hearth
boiler
oil shale
square
superheater
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Granted
Application number
CN201510983680.8A
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Chinese (zh)
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CN105444144B (en
Inventor
姜雪
姜孝国
王君峰
高新宇
王刚
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Harbin Boiler Co Ltd
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Harbin Boiler Co Ltd
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Priority to CN201510983680.8A priority Critical patent/CN105444144B/en
Publication of CN105444144A publication Critical patent/CN105444144A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • 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
    • F23C10/02Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/04Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
    • F23C10/08Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
    • F23C10/10Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
    • 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
    • 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 
    • F23C2206/00Fluidised bed combustion
    • F23C2206/10Circulating fluidised bed
    • 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 
    • F23C2900/00Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/99004Combustion process using petroleum coke or any other fuel with a very low content in volatile matters

Abstract

The invention relates to a 300MWCFB boiler and a distribution method for oil shale for combustion. Implementation of upsizing of a circulating fluidized bed boiler for the oil shale for combustion becomes an important topic for technological development of the circulating fluidized bed boiler. The 300MWCFB boiler for the oil shale for combustion comprises a boiler body; a boiler cylinder (11) is arranged above a square hearth and along the center of the hearth; a slag cooler (9) and an under-bed start-up burner (10) are arranged below the square hearth; a water cooling screen (9), a high-temperature re-heater (6) and a high-temperature super-heater (7) are arranged in the center area of the upper space in the square hearth; steam and water separators (3) are symmetrically arranged at the two sides of the square hearth; the upper parts of the steam and water separators are connected with the square hearth via inlet flues (2); the lower parts of the steam and water separators are connected with the square hearth via material returning valves (8); the steam and water separators are used for connecting a steam and cold separator with a tail enclosure wall super-heater (14) via outlet flues (4). The invention discloses the 300MWCFB boiler which is applicable to the oil shale for combustion.

Description

For 300MWCFB boiler and the layout method of fuel oil shale
technical field:
the present invention relates to a kind of 300MWCFB boiler for fuel oil shale.
background technology:
china's oil shale reserves is large, traditional oil shale using energy source technique exists that cost is high, utilization rate is low, granule wax shale cannot be refined oil, about there is 30% oil shale to refine oil, need discharge on the spot and stack, create very serious environmental pollution, and adopt oil shale can realize the comprehensive utilization of oil shale as the fuel of coal-burning power plant, and the pollution reduced environment, be conducive to solving the problems such as fuel anxiety and oil shale accumulation, there is far-reaching social benefit, because pulverized coal preparation system is unreliable, dust stratification, stifled ash, the problems such as seriously corroded and steady combustion difficulty exist, oil shale cannot be used as the fuel of pulverized-coal fired boiler always, and adopt Combustion technology of circulating fluidized to solve the problem, as far back as the nineties in last century, the small-scale circulating fluidized bed boiler of existing fuel oil shale is put into commercial operation, but its efficiency of combustion is low, pollutant discharge amount is higher, therefore, the maximization realizing the CFBB of fuel oil shale fuel has become key subjects of Technology of Circulating Fluidized Bed Boiler development, the domestic technology that there is no the 300MWCFB boiler of fuel oil shale fuel at present, this technology has wide market prospects.
current 300MWCFB boiler technology is very ripe, obtains a large amount of application at home and abroad.Because oil shale abrasiveness is strong, volatile matter is high, easily catch fire, after-flame is difficult, calorific value is low, comparatively large on the impact of stove combustion, on heavy duty boiler, design difficulty is also comparatively large, so, be that the 300MWCFB boiler technology of fuel does not also have Related product at present with oil shale.
summary of the invention:
the object of this invention is to provide a kind of 300MWCFB boiler for fuel oil shale and layout method thereof.
above-mentioned object is realized by following technical scheme:
a kind of 300MWCFB boiler for fuel oil shale, its composition comprises: boiler body, described boiler body front portion is provided with square burner hearth, prolong burner hearth center arrangement directly over described square burner hearth and have drum, the below of described square burner hearth has slag cooler and Induct burner, the central area in described square burner hearth internal upper part space is furnished with water-cooling screen, high temperature reheater and high temperature superheater, described square burner hearth bilateral symmetry is furnished with steam-water separator, described steam-water separator top is connected with square burner hearth by gas approach, described steam-water separator bottom is connected by the square thorax of material returning valve and stove, cold for vapour separator is communicated with afterbody enclosure wall superheater by exhaust pass by described steam-water separator.
the described 300MWCFB boiler for fuel oil shale, described enclosure wall superheater is arranged in square burner hearth dead astern, described enclosure wall superheater is divided into former and later two flues, before described enclosure wall superheater, flue arranges low-temperature reheater and economizer A successively under upper, medium temperature overheater is arranged successively from top to bottom in described enclosure wall superheater rear pass, low temperature superheater and economizer B, it is economizer hopper below described enclosure wall superheater, described economizer hopper rear connects SCR device, below described SCR device, air preheater is set, described air preheater is connected with square burner hearth by hot-flow flue, the exhanst gas outlet of described air preheater is connected flue gas system respectively with air intake.
the described 300MWCFB boiler for fuel oil shale, described square burner hearth center line overlaps with boiler body center line, described slag cooler is drawn on the left of square burner hearth, under described bed, starter is drawn on the right side of square burner hearth, described enclosure wall superheater is that square, described enclosure wall superheater center line overlaps with boiler center line.
the layout method of the described 300MWCFB boiler for fuel oil shale, adopt H type layout, single burner hearth, single air distributor structure, improve furnace height as far as possible, make the extended residence time of fuel in burner hearth, ensure that oil shale fuel can be fully burned in burner hearth, consider the many structures in the form of sheets of oil shale, be not easy to the fluidisation of bed material, reasonable Arrangement major diameter bell-shaped blast cap on burner hearth air distribution plate, in it, pipe resistance is reasonable in design, make cloth wind even, make a stream evenly.
the layout method of the described 300MWCFB boiler for fuel oil shale, reheated steam adopts afterbody twin flue damper adjustment, front flue arranges low-temperature reheater and economizer, rear pass arranges medium temperature overheater, low temperature superheater and economizer, and above heating surface is arranged in Bao Qiang district, the cold separator of efficient Scroll vapour is adopted to be arranged symmetrically with, its separative efficiency can reach more than 99.99%, the dust content entering afterbody Bao Qiang district reduces greatly, thus effectively prevent the wearing and tearing of Bao Qiang district heating surface, separator is arranged symmetrically with, each separator inlet exhaust gas volumn and inventory substantially equal, be easy to the uniformity ensureing separator separating effect and returning charge amount, inner flue gas of the stove and material flow field also symmetrically form, flowing evenly, stove combustion diabatic process is easy to ensure.
the layout method of the described 300MWCFB boiler for fuel oil shale, adopt on bed, bed second line of a couplet chalaza ignition technique, improve speed of ignition, nearly fast steady combustion, reduce igniting and throw oil mass, fuel is sent into burner hearth by two-way material returning valve, extend ignition time, coal supply evenly, mixing is better, is conducive to the burning of oil shale fuel, high temperature superheater is arranged in stove, high temperature reheater and water-cooling screen, and all curtain walls are and draw from side wall, be evenly arranged in burner hearth central area, tube panel is heated more even, reduce the uneven degree of pipe thermic load in curtain wall, burner hearth internal heat can be reached simultaneously and absorb more uniform object, thus the more effective uniformity controlling boiler bed temperature, more be conducive to the Thorough combustion of oil shale fuel in burner hearth, and this arrangement, make stove internal heating surface as far as possible away from the sticking wall flow of burner hearth Matter Transfer, reduce the wearing and tearing of heating surface in burner hearth, for the feature that the abrasiveness of oil shale is strong, significant points in burner hearth lays wearing-proof refractory material.
beneficial effect of the present invention:
1. the present invention adopts H type layout, single burner hearth, single air distributor structure, improve furnace height as far as possible, make the extended residence time of fuel in burner hearth, ensure that oil shale fuel can be fully burned in burner hearth, consider the many structures in the form of sheets of oil shale, be not easy to the fluidisation of bed material, on burner hearth air distribution plate, reasonable Arrangement breathes out the major diameter bell-shaped blast cap of pot patented technology, in it, pipe resistance is reasonable in design, makes cloth wind even, make a stream evenly.
reheated steam of the present invention adopts afterbody twin flue damper adjustment, front flue arranges low-temperature reheater and economizer, rear pass arranges medium temperature overheater, low temperature superheater and economizer, and above heating surface is arranged in Bao Qiang district, the cold separator of efficient Scroll vapour is adopted to be arranged symmetrically with, its separative efficiency can reach more than 99.99%, the dust content entering afterbody Bao Qiang district reduces greatly, thus effectively prevent the wearing and tearing of Bao Qiang district heating surface, separator is arranged symmetrically with, each separator inlet exhaust gas volumn and inventory substantially equal, be easy to the uniformity ensureing separator separating effect and returning charge amount, inner flue gas of the stove and material flow field also symmetrically form, flowing evenly, stove combustion diabatic process is easy to ensure.
the present invention adopts on bed, bed second line of a couplet chalaza ignition technique, improves speed of ignition, nearly fast steady combustion, reduces igniting and throws oil mass, fuel is sent into burner hearth by two-way material returning valve, extend ignition time, coal supply evenly, mixing is better, is conducive to the burning of oil shale fuel, high temperature superheater is arranged in stove, high temperature reheater and water-cooling screen, and all curtain walls are and draw from side wall, be evenly arranged in burner hearth central area, tube panel is heated more even, reduce the uneven degree of pipe thermic load in curtain wall, burner hearth internal heat can be reached simultaneously and absorb more uniform object, thus the more effective uniformity controlling boiler bed temperature, more be conducive to the Thorough combustion of oil shale fuel in burner hearth, and this arrangement, make stove internal heating surface as far as possible away from the sticking wall flow of burner hearth Matter Transfer, reduce the wearing and tearing of heating surface in burner hearth, for the feature that the abrasiveness of oil shale is strong, during conceptual design, significant points in burner hearth lays wearing-proof refractory material.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
accompanying drawing 2 is front views of accompanying drawing 1.
accompanying drawing 3 is top views of accompanying drawing 1.
detailed description of the invention:
embodiment 1:
a kind of 300MWCFB boiler for fuel oil shale, its composition comprises: boiler body, described described boiler body front portion is provided with square burner hearth 1, prolong burner hearth center arrangement directly over described square burner hearth and have drum 11, the below of described square burner hearth has slag cooler 9 and Induct burner 10, the central area in described square burner hearth internal upper part space is furnished with water-cooling screen 5, high temperature reheater 6 and high temperature superheater 7, described square burner hearth bilateral symmetry is furnished with steam-water separator 3, described steam-water separator top is connected with square burner hearth by gas approach 2, described steam-water separator bottom is connected with the square thorax of stove by material returning valve 8, cold for vapour separator is communicated with afterbody enclosure wall superheater 14 by exhaust pass 4 by described steam-water separator.
embodiment 2:
the 300MWCFB boiler for fuel oil shale according to embodiment 1, described enclosure wall superheater is arranged in square burner hearth dead astern, described enclosure wall superheater is divided into former and later two flues, before described enclosure wall superheater, flue arranges low-temperature reheater and economizer A18 successively under upper, medium temperature overheater 15 is arranged successively from top to bottom in described enclosure wall superheater rear pass, low temperature superheater 16 and economizer B19, it is economizer hopper 20 below described enclosure wall superheater, described economizer hopper rear connects SCR device 21, air preheater 12 is set below described SCR device, described air preheater is connected with square burner hearth by hot-flow flue, the exhanst gas outlet of described air preheater is connected flue gas system respectively with air intake.
embodiment 3:
the 300MWCFB boiler for fuel oil shale according to embodiment 1 or 2, described square burner hearth center line overlaps with boiler body center line, described slag cooler is drawn on the left of square burner hearth, under described bed, starter is drawn on the right side of square burner hearth, described enclosure wall superheater is that square, described enclosure wall superheater center line overlaps with boiler center line.
embodiment 4:
the layout method of the 300MWCFB boiler for fuel oil shale according to embodiment 1 or 2 or 3, adopt H type layout, single burner hearth, single air distributor structure, improve furnace height as far as possible, make the extended residence time of fuel in burner hearth, ensure that oil shale fuel can be fully burned in burner hearth, consider the many structures in the form of sheets of oil shale, be not easy to the fluidisation of bed material, reasonable Arrangement major diameter bell-shaped blast cap on burner hearth air distribution plate, in it, pipe resistance is reasonable in design, make cloth wind even, make a stream evenly.
embodiment 5:
the layout method of the 300MWCFB boiler for fuel oil shale according to embodiment 1 or 2 or 3 or 4, reheated steam adopts afterbody twin flue damper adjustment, front flue arranges low-temperature reheater and economizer, rear pass arranges medium temperature overheater, low temperature superheater and economizer, and above heating surface is arranged in Bao Qiang district, the cold separator of efficient Scroll vapour is adopted to be arranged symmetrically with, its separative efficiency can reach more than 99.99%, the dust content entering afterbody Bao Qiang district reduces greatly, thus effectively prevent the wearing and tearing of Bao Qiang district heating surface, separator is arranged symmetrically with, each separator inlet exhaust gas volumn and inventory substantially equal, be easy to the uniformity ensureing separator separating effect and returning charge amount, inner flue gas of the stove and material flow field also symmetrically form, flowing evenly, stove combustion diabatic process is easy to ensure.
embodiment 6:
the layout method of the 300MWCFB boiler for fuel oil shale according to embodiment 1 or 2 or 3 or 4 or 5, adopt on bed, bed second line of a couplet chalaza ignition technique, improve speed of ignition, nearly fast steady combustion, reduce igniting and throw oil mass, fuel is sent into burner hearth by two-way material returning valve, extend ignition time, coal supply evenly, mixing is better, is conducive to the burning of oil shale fuel, high temperature superheater is arranged in stove, high temperature reheater and water-cooling screen, and all curtain walls are and draw from side wall, be evenly arranged in burner hearth central area, tube panel is heated more even, reduce the uneven degree of pipe thermic load in curtain wall, burner hearth internal heat can be reached simultaneously and absorb more uniform object, thus the more effective uniformity controlling boiler bed temperature, more be conducive to the Thorough combustion of oil shale fuel in burner hearth, and this arrangement, make stove internal heating surface as far as possible away from the sticking wall flow of burner hearth Matter Transfer, reduce the wearing and tearing of heating surface in burner hearth, for the feature that the abrasiveness of oil shale is strong, significant points in burner hearth lays wearing-proof refractory material.

Claims (6)

1. the 300MWCFB boiler for fuel oil shale, its composition comprises: boiler body, it is characterized in that: described boiler body front portion is provided with square burner hearth, prolong burner hearth center arrangement directly over described square burner hearth and have drum, the below of described square burner hearth has slag cooler and Induct burner, the central area in described square burner hearth internal upper part space is furnished with water-cooling screen, high temperature reheater and high temperature superheater, described square burner hearth bilateral symmetry is furnished with steam-water separator, described steam-water separator top is connected with square burner hearth by gas approach, described steam-water separator bottom is connected by the square thorax of material returning valve and stove, cold for vapour separator is communicated with afterbody enclosure wall superheater by exhaust pass by described steam-water separator.
2. the 300MWCFB boiler for fuel oil shale according to claim 1, it is characterized in that: described enclosure wall superheater is arranged in square burner hearth dead astern, described enclosure wall superheater is divided into former and later two flues, before described enclosure wall superheater, flue arranges low-temperature reheater and economizer A successively under upper, described enclosure wall superheater rear pass. inside arrange medium temperature overheater successively from top to bottom, low temperature superheater and economizer B, it is economizer hopper below described enclosure wall superheater, described economizer hopper rear connects SCR device, below described SCR device, air preheater is set, described air preheater is connected with square burner hearth by hot-flow flue, the exhanst gas outlet of described air preheater is connected flue gas system respectively with air intake.
3. according to the 300MWCFB boiler of claim 1 or 2 for fuel oil shale, it is characterized in that: described square burner hearth center line overlaps with boiler body center line, described slag cooler is drawn on the left of square burner hearth, under described bed, starter is drawn on the right side of square burner hearth, described enclosure wall superheater is that square, described enclosure wall superheater center line overlaps with boiler center line.
4. a claim 1 or 2 or 3 is for the layout method of the 300MWCFB boiler of fuel oil shale, it is characterized in that: adopt H type layout, single burner hearth, single air distributor structure, improve furnace height as far as possible, make the extended residence time of fuel in burner hearth, ensure that oil shale fuel can be fully burned in burner hearth, consider the many structures in the form of sheets of oil shale, be not easy to the fluidisation of bed material, reasonable Arrangement major diameter bell-shaped blast cap on burner hearth air distribution plate, in it, pipe resistance is reasonable in design, make cloth wind even, make a stream evenly.
5. the layout method of the 300MWCFB boiler for fuel oil shale according to claim 4, it is characterized in that: reheated steam adopts afterbody twin flue damper adjustment, front flue arranges low-temperature reheater and economizer, rear pass arranges medium temperature overheater, low temperature superheater and economizer, and above heating surface is arranged in Bao Qiang district, the cold separator of efficient Scroll vapour is adopted to be arranged symmetrically with, its separative efficiency can reach more than 99.99%, the dust content entering afterbody Bao Qiang district reduces greatly, thus effectively prevent the wearing and tearing of Bao Qiang district heating surface, separator is arranged symmetrically with, each separator inlet exhaust gas volumn and inventory substantially equal, be easy to the uniformity ensureing separator separating effect and returning charge amount, inner flue gas of the stove and material flow field also symmetrically form, flowing evenly, stove combustion diabatic process is easy to ensure.
6. the layout method of the 300MWCFB boiler for fuel oil shale according to claim 4 or 5, it is characterized in that: adopt on bed, bed second line of a couplet chalaza ignition technique, improve speed of ignition, nearly fast steady combustion, reduce igniting and throw oil mass, fuel is sent into burner hearth by two-way material returning valve, extend ignition time, coal supply evenly, mixing is better, is conducive to the burning of oil shale fuel, high temperature superheater is arranged in stove, high temperature reheater and water-cooling screen, and all curtain walls are and draw from side wall, be evenly arranged in burner hearth central area, tube panel is heated more even, reduce the uneven degree of pipe thermic load in curtain wall, burner hearth internal heat can be reached simultaneously and absorb more uniform object, thus the more effective uniformity controlling boiler bed temperature, more be conducive to the Thorough combustion of oil shale fuel in burner hearth, and this arrangement, make stove internal heating surface as far as possible away from the sticking wall flow of burner hearth Matter Transfer, reduce the wearing and tearing of heating surface in burner hearth, for the feature that the abrasiveness of oil shale is strong, significant points in burner hearth lays wearing-proof refractory material.
CN201510983680.8A 2015-12-24 2015-12-24 For using the 300MWCFB boilers and layout method of oil shale Active CN105444144B (en)

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CN110285400A (en) * 2019-06-28 2019-09-27 自贡华西能源工业有限公司 Pure fuel oil shale CFB boiler
CN110822394A (en) * 2019-11-19 2020-02-21 哈尔滨锅炉厂有限责任公司 Novel biomass direct-fired CFB boiler and combustion method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110285400A (en) * 2019-06-28 2019-09-27 自贡华西能源工业有限公司 Pure fuel oil shale CFB boiler
CN110285400B (en) * 2019-06-28 2020-10-09 自贡华西能源工业有限公司 Pure fuel oil shale CFB boiler
CN110822394A (en) * 2019-11-19 2020-02-21 哈尔滨锅炉厂有限责任公司 Novel biomass direct-fired CFB boiler and combustion method

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