CN202561728U - Small-and-medium scale industrial boiler system for cleaning fuel of burning powder body - Google Patents

Small-and-medium scale industrial boiler system for cleaning fuel of burning powder body Download PDF

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Publication number
CN202561728U
CN202561728U CN2012201870164U CN201220187016U CN202561728U CN 202561728 U CN202561728 U CN 202561728U CN 2012201870164 U CN2012201870164 U CN 2012201870164U CN 201220187016 U CN201220187016 U CN 201220187016U CN 202561728 U CN202561728 U CN 202561728U
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China
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outlet
powder
connects
boiler
air
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CN2012201870164U
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Chinese (zh)
Inventor
张榕杰
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福建永恒能源管理有限公司
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Abstract

The utility model discloses a small-and-medium scale industrial boiler system for cleaning a fuel of a burning powder body. The small-and-medium scale industrial boiler system comprises a fuel feeding device, a boiler burning device, a tail gas flue heating power recovering device and a flue gas desulfurization, denitration and dust-removal device which are sequentially connected. Because the burning device adopts the arrangements of double-burner equipment and a double-return trip gas flue, the stable operation of the boiler at the load of smaller than 35 percent and the compact structure of the boiler are guaranteed. By adopting the selective catalytic reduction denitration technology, the pneumatic emulsion desulfuration technology and a bag-type dust removal technology are adopted, the ideal desulfuration, denitration and dust-removal effects of the tail gas flue can be achieved. The small-and-medium scale industrial boiler system has the advantages of simple and reliable structure, convenience in operation and small floor area, the burning efficiency is up to over 98 percent, and the emission of pollutants is far below the national control standard.

Description

The middle-size and small-size industrial boiler system of clean burning powder fuel

Technical field

The utility model belongs to the energy-conserving and emission-cutting technology of heating power production field, particularly relates to a kind of middle-size and small-size industrial boiler system of clean burning powder fuel.

Background technology

Future quite over a long time in, the numerous needs with heat with industries such as the economic field of vapour such as chemical industry, papermaking, weaving, light industry and foods, coal-burned industrial boiler will be the leading products that production provides heat and steam.According to incompletely statistics, at present China's 500,000 small-sized coal-burned industrial boilers below the 35t/h of having an appointment have a wide range of applications in industries such as chemical industry, papermaking, printing and dyeing, light industry and foods.

Yet the middle-size and small-size coal-burned industrial boiler ubiquity of China has efficiency of combustion low, problems such as pollutant emission height.The average operating thermal efficiency of China's coal-burned industrial boiler only has about 65% at present; Than low 15~20 percentage points of international most advanced level; Its reason mainly contains 2 points: the one, design owing to Industrial Boiler generally all is directed against certain concrete coal, and the enterprise of China has problems such as coal is changeable basically in actual motion.The 2nd, the automaticity and the operation and management level of steam generator system are lower.In addition; Middle-size and small-size coal-burned industrial boiler is comprising aspect the emission control of Air thing that desulfurization, denitration and dedusting etc. also have some problems; As; Traditional miniature boiler generally adopts water film dedusting, and this need consume a large amount of water for industrial uses, has secondary pollution and dust simultaneously and problem such as can't recycle.And desulphurization denitration equipment is not installed at the middle-size and small-size Industrial Boiler that uses that puts into operation at present mostly by China; Along with the pay attention to day by day of country to environmental problem; At present more existing enterprises gradually adopt dry method, semidry method or wet desulfurizing process to carry out flue gas desulfurization; Advantage such as wet process of FGD technology, technology maturation low, the recyclable utilization of accessory substance gypsum and being adopted wherein with its desulfuration efficiency height, wide accommodation, calcium sulfur ratio morely, but also have shortcomings such as dropping into height, complex equipments, volume are big, operating cost height.

Therefore, change Traditional industrial boiler combustion theory, (reduce the powder granule particle diameter, increase specific grain surface and amass, improve the reactive of particle and then improve its burning velocity, reach the effect that improves efficiency of combustion through technology is integrated; Operation stability when adopting double burner with the assurance boiler at low load; Adopt the compact conformation and the high-efficiency desulfurization of Pneumatic emulsifying technical guarantee flue gas processing device; Deng); A middle-size and small-size industrial boiler system of innovative design exploitation to clean burning powder fuel; To improve the efficiency of combustion of middle-size and small-size industrial boiler system; Reduce its Air thing discharging, significant to improving economic benefit of enterprises and social benefit, will have wide market application prospect.

The utility model content

The purpose of the utility model is to provide the middle-size and small-size industrial boiler system that a kind of efficiency of combustion is high, pollutant emission meets the clean burning powder fuel of national increasingly stringent environmental requirement.

For realizing above-mentioned purpose, the technical solution of the utility model is:

The utility model is a kind of middle-size and small-size industrial boiler system of clean burning powder fuel, and it comprises fuel charging gear, boiler combustion device, back-end ductwork heating power retracting device, flue gas desulfurization, denitration and dust arrester; And the auxiliary detection control device etc.

Described fuel charging gear comprises powder Bunker, screw unloading valve, middle powder storehouse, screw(-type) feeder, primary air fan; The outer coal supply device of said powder Bunker import junction chamber, outlet connects said screw unloading valve, and said middle powder storehouse import connects said screw unloading valve, and outlet connects said screw(-type) feeder import; Said screw(-type) feeder outlet connects primary air fan; Described powder Bunker and middle powder storehouse add ultrasonic oscillator and mechnical oscillator;

Described boiler combustion device comprises overfire air fan, double burner, burner hearth, water-cooling wall; Described double burner and water-cooling wall are arranged in the burner hearth, and the air inlet of burner connects the outlet of ajutage and the outlet of overfire air fan.

Described back-end ductwork heating power retracting device comprises economizer, air preheater; Said economizer inlet is connected the exhanst gas outlet of burner hearth afterbody, and outlet connects air preheater;

Described flue gas desulfurization, denitration and dust arrester comprise sack cleaner, Pneumatic emulsifying desulfurizer, SCR (SCR) denitrification apparatus, air-introduced machine, chimney; Said sack cleaner import connects described air preheater outlet; Exhaust outlet on it and exhaust outlet are connected the import and the ash releasing tube of selective catalytic reduction denitration device respectively; The selective catalytic reduction denitration device outlet connects the import of said Pneumatic emulsifying desulfurizer; The outlet of Pneumatic emulsifying desulfurizer connects described air-introduced machine import, and the air-introduced machine outlet connects leads to outdoor chimney.

After adopting such scheme, the utlity model has following several big characteristics:

One, fail powder system and adopt ultrasonic concussion and machinery concussion technology, can prevent powder agglomeration, it is continuous and stable to guarantee that superfine powder is carried.

Two, combustion system has adopted double burner, two backhaul flue to arrange.Adopt double burner to help strengthening the flow field disturbance, prolong the fine fuels time of staying of particle in burner hearth, but overheavy firing, and the burnout rate of raising combustible particle has also helped guaranteeing simultaneously the stable operation of boiler than underload the time.When load was low to moderate 35%, boiler still can normally move; Two backhaul flues arrange and then make the boiler combustion system compact conformation that floor space is little.

Three, light a fire smoothly and have higher efficiency of combustion, this device to be directed to the powder fuel of combustion heat value more than 5000kcal/kg for guaranteeing; The fugitive constituent of fuel should be greater than 20%.

Four, denitrification apparatus adopts the SCR technology; Desulphurization system adopts the Pneumatic emulsifying sulfur removal technology, and absorption liquid adopts certain density niter buck (also can use alkaline industrial waste water); Adopt bag-type dust, can realize the cleaning discharging of flue dust.

Five, this device is realized automatically controlling, and helps improving operational efficiency, reduces operating cost.

Through above-mentioned technology and the design of structural utility model, the feasible characteristics such as steam generator system compactness, floor space is few, stable, energy utilization rate is high, pollutant emission is low that the utlity model has.When the calorific value of powder fuel when 5500kcal/kg is above, its burnout rate can reach more than 98%, the sulfur dioxide in flue gas concentration of emission is less than 50mg/m 3, discharged nitrous oxides concentration is less than 300mg/m 3, smoke dust discharge concentration is less than 50mg/m 3, far below the national standard requirement.

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

Description of drawings

Fig. 1 is the device plane of the utility model.

The specific embodiment

As shown in Figure 1; The utility model is a kind of middle-size and small-size industrial boiler system of clean burning powder fuel, and it is made up of fuel charging gear 1, boiler combustion device 2, back-end ductwork heating power retracting device 3, flue gas desulfurization, denitration and dust arrester 4 and various auxiliary detection control device five parts.

Described fuel charging gear 1 is made up of powder Bunker 11, screw unloading valve 12, middle filler bin 13, screw(-type) feeder 14, primary air fan 15 and corresponding pipeline etc.Said powder Bunker 11 import junction chamber outer fuel feedwaies, its outlet connects screw unloading valve 12; Filler bin 13 imports connect screw unloading valve 12 in the middle of said, and outlet connects said screw(-type) feeder 14.Described powder Bunker 11 adds ultrasonic oscillator 16 and mechnical oscillator 17 with middle powder storehouse 13.Said screw(-type) feeder 14 outlets connect the material blanking tube of an inclination; One ajutage is set below said screw(-type) feeder 14; The import of said ajutage connects primary air fan 15, and the outlet of said ajutage is circular arc, and said material blanking tube is the tangential and connects said ajutage.When screw unloading valve 12 was opened, filler bin 13 in the middle of the powder in the powder Bunker 11 flows into was carried through screw(-type) feeder 14 then, is mixed into boiler combustion with a wind.

Described boiler combustion device 2 is made up of overfire air fan 21, burner 22-1, burner 22-2, burner hearth 23, water-cooling wall 24 and corresponding pipeline.Described burner 22-1, burner 22-2 and water-cooling wall 24 all are arranged in the burner hearth 23, and the air inlet of burner 22-1 and burner 22-2 is connected the outlet and the ajutage outlet of overfire air fan 22.One time wind is sent powder into burner hearth 23; Secondary wind is sneaked into after the powder air-flow catches fire; Supply with the required oxygen amount of powder fuel after-flame, guarantee its completing combustion, combustion product is that main, convection current is that the heat transfer type of assisting is with the working medium in the heat transferred water-cooling wall 24 with the radiation.

Described back-end ductwork heating power retracting device 3 is made up of economizer 31, air preheater 32 and corresponding pipeline.Said economizer 31 inlets are connected the exhanst gas outlet of said burner hearth 23 afterbodys, and its outlet connects air preheater.

Described flue gas desulfurization, denitration and dust arrester 4 are made up of sack cleaner 41, selective catalytic reduction denitration device and Pneumatic emulsifying desulfurizer 42, air-introduced machine (not shown), chimney 44 and corresponding pipeline.Said sack cleaner 41 imports connect described air preheater outlet; Exhaust outlet on it and exhaust outlet are connected the import and the ash releasing tube of selective catalytic reduction denitration device and Pneumatic emulsifying desulfurizer 42 respectively; 42 outlets of Pneumatic emulsifying desulfurizer connect the import of said air-introduced machine, and the air-introduced machine outlet connects leads to outdoor chimney.The absorption liquid of described Pneumatic emulsifying desulfurizer 42 adopts niter buck (or alkaline industrial waste water).

The operation principle of the utility model:

When screw unloading valve 12 is opened; Powder storehouse 13 in the middle of powder in the powder Bunker 11 gets into (ultrasonic oscillator 16 guarantees the continous-stable that superfine powder is carried with mechnical oscillator 17); Pass through the conveying of screw(-type) feeder 14 again; Send into burner hearth 23 by a wind and burn, send into an amount of secondary wind in the burning later stage.Wherein, One time wind carries powder fuel to get into burner hearth 23; And volatile combustion requisite oxygen amount in the powder fuel fire stage is provided, secondary wind is sneaked into after the powder air-flow catches fire, and supplies with powder fuel after-flame requisite oxygen amount; Guarantee its burning, combustion product (mainly being flue gas) is that main, convection current is that the heat transfer type of assisting is with the working medium in the heat transferred water-cooling wall with the radiation.The middle low-temperature flue gas that burning generates is flowed through when being arranged in economizer 31 in the boiler, air preheater 32, and the heat in the flue gas is absorbed, and exhaust gas temperature reduces, and improves boiler efficiency, fuel saving.The employing of economizer 31 has improved the water temperature that gets into the stove tube and has reduced the temperature difference between drum wall and the feedwater, thereby the drum thermal stress is reduced, and improves the drum life-span.Air preheater 32 utilizes the required air of fume afterheat heating flame, has strengthened and has caught fire and combustion process.The flue gas that temperature reduces is got into by sack cleaner 41 air inlets, and when ash flue bucket, the part big dust particle is separated by inertia force and gravity effect; Directly fall into the ash bucket bottom; Behind ash bucket, the filter bag filtering area of casing in the entering, flying dust is delayed at the filter bag outer surface; Flue gas after being purified gets into upper box through filter pocket mouths, is discharged by air outlet again.Flow through again selective catalytic reduction denitration device and Pneumatic emulsifying desulfurizer 42 of flue gas after the dedusting carries out desulphurization denitration; Since in the emulsion specific area of liquid grain than methods such as water film dedusting, spraying and dedusting big several times to tens times; Therefore; The efficient of the harmful substance of unit liquid measure supplementary set and absorption will enlarge markedly, and desulphurization reaction speed is fast, efficient is high, the absorption liquid utilization rate high.At last, flue gas enters atmosphere by air-introduced machine 43 suction chimneys 44.

Claims (1)

1. the middle-size and small-size industrial boiler system of a clean burning powder fuel, it is characterized in that: it comprises fuel charging gear, boiler combustion device, back-end ductwork heating power retracting device, flue gas desulfurization, denitration and dust arrester;
Described fuel charging gear comprises powder Bunker, screw unloading valve, middle powder storehouse, screw(-type) feeder, primary air fan; The outer coal supply device of said powder Bunker import junction chamber, outlet connects said screw unloading valve, and said middle powder storehouse import connects said screw unloading valve, and outlet connects said screw(-type) feeder import; Said screw(-type) feeder outlet connects primary air fan; Described powder Bunker and middle powder storehouse add ultrasonic oscillator and mechnical oscillator;
Described boiler combustion device comprises overfire air fan, double burner, burner hearth, water-cooling wall; Described double burner and water-cooling wall are arranged in the burner hearth, and the air inlet of burner connects the outlet of ajutage and the outlet of overfire air fan;
Described back-end ductwork heating power retracting device comprises economizer, air preheater; Said economizer inlet is connected the exhanst gas outlet of burner hearth afterbody, and outlet connects air preheater;
Described flue gas desulfurization, denitration and dust arrester comprise sack cleaner, Pneumatic emulsifying desulfurizer, SCR (SCR) denitrification apparatus, air-introduced machine, chimney; Said sack cleaner import connects described air preheater outlet; Exhaust outlet on it and exhaust outlet are connected the import and the ash releasing tube of Pneumatic emulsifying desulfurizer respectively; The outlet of Pneumatic emulsifying desulfurizer connects the import of said air-introduced machine, and the air-introduced machine outlet connects leads to outdoor chimney.
CN2012201870164U 2012-04-27 2012-04-27 Small-and-medium scale industrial boiler system for cleaning fuel of burning powder body CN202561728U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103203177A (en) * 2013-03-21 2013-07-17 王民发 Application of multi-section composition pollutant removing technology in novel coal powder industrial boilers
CN104344417A (en) * 2014-10-30 2015-02-11 惠州市拓丰实业有限公司 High-efficiency and energy-saving boiler
CN104976615A (en) * 2015-07-09 2015-10-14 福建永恒能源管理有限公司 Backflow smoke recycling coal dust industrial boiler combustion system
CN105157050A (en) * 2015-10-15 2015-12-16 亿利洁能科技有限公司 Ultra-low-emission energy supply system for industrial boiler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103203177A (en) * 2013-03-21 2013-07-17 王民发 Application of multi-section composition pollutant removing technology in novel coal powder industrial boilers
CN104344417A (en) * 2014-10-30 2015-02-11 惠州市拓丰实业有限公司 High-efficiency and energy-saving boiler
CN104976615A (en) * 2015-07-09 2015-10-14 福建永恒能源管理有限公司 Backflow smoke recycling coal dust industrial boiler combustion system
CN105157050A (en) * 2015-10-15 2015-12-16 亿利洁能科技有限公司 Ultra-low-emission energy supply system for industrial boiler

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Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Small-and-medium scale industrial boiler system for cleaning fuel of burning powder body

Effective date of registration: 20171123

Granted publication date: 20121128

Pledgee: Industrial Bank Limited by Share Ltd Quanzhou branch

Pledgor: Fujian Eternal Energy Management Co., Ltd.

Registration number: 2017350000136

PE01 Entry into force of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20181119

Granted publication date: 20121128

Pledgee: Industrial Bank Limited by Share Ltd Quanzhou branch

Pledgor: Fujian Eternal Energy Management Co., Ltd.

Registration number: 2017350000136

PC01 Cancellation of the registration of the contract for pledge of patent right