CN101881433A - Steam boiler capable of burning biomass - Google Patents

Steam boiler capable of burning biomass Download PDF

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Publication number
CN101881433A
CN101881433A CN2009100392030A CN200910039203A CN101881433A CN 101881433 A CN101881433 A CN 101881433A CN 2009100392030 A CN2009100392030 A CN 2009100392030A CN 200910039203 A CN200910039203 A CN 200910039203A CN 101881433 A CN101881433 A CN 101881433A
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CN
China
Prior art keywords
biomass
burner hearth
steam boiler
wind
boiler
Prior art date
Application number
CN2009100392030A
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Chinese (zh)
Inventor
常厚春
李祖芹
马革
耿生斌
尹显录
张湘波
Original Assignee
广州迪森热能技术股份有限公司
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Priority to CN2009100392030A priority Critical patent/CN101881433A/en
Publication of CN101881433A publication Critical patent/CN101881433A/en

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Abstract

The invention discloses a steam boiler capable of burning biomass, comprising a boiler body, a loading system and a vapour-water pipe system, wherein the boiler body is provided with a hearth in which the biomass fuel burns so as to release heat and a heat exchange device positioned above the hearth; the loading system is connected with the boiler body so as to convey the biomass fuel to the hearth for burning; the vapour-water pipe system is connected with the heat exchange device so as to exchange heat generated by the burning of the biomass; the hearth is internally provided with a reciprocal grate which downward slopes relatively to the level in an angle of inclination of 5-25 degrees from the end of the hearth close to the loading system to the far end far away from the loading system so as to enable the biomass fuel falling on the fire grate to be pushed and extruded and to roll relatively to the fire grate. In the invention, the fire grate moves relatively to fuel, the fuel is constantly extruded in the process of being pushed so as to damage coke and ash shells; and the fuel rolls slowly, thereby enabling the material layer to be loosened and facilitating full combustion.

Description

Biomass-burning steam boiler

Technical field

The present invention relates to a kind of steam boiler, relating in particular to a kind of is the steam boiler of fuel with living beings.

Background technology

Biomass fuel (BMF) is a green energy resource, is the fuel that national policy is encouraged, and has following a few dot characteristics: 1. can realize greenhouse gases CO 2Ecological " zero " discharging: the energy of BMF comes from it when growing to nature CO 2Absorption, therefore, BMF has CO 2The characteristics of ecological " zero " discharging.2. typical low-carbon (LC) green energy resource: the burning of low-carbon (LC) energy BMF is based on fugitive constituent, and the content of its fixed carbon is about 15%, is typical low-carbon (LC) fuel; Sulfur content is also lower than diesel oil, only is 0.05%, desulfurizer need be set just can realize SO 2Discharging; Ash is 1.8% only, is about 1/10 of coal derived fuel, simple dust arrester is set just can realizes that dust emission is up to standard; The BMF nitrogen content is low, and the oxygen content height generates less NO during burning X3. typical recycling economy project: BMF derives from agriculture and forestry organic waste material, and feed distribution is extensively various, and content is big, and cost is low, and cycling deposition is inexhaustible, is typical recycling economy project.4. safe ready: density is big, and volume is little, and solid forming packs, and transportation stores convenient.

The biomass fuel its own particularity has proposed some special requirements to the design of combustion apparatus, such as, feeding manner, air supply mode etc. are so that full combustion of fuel and burning.

A kind of biomass chain combusting boiler device that is disclosed for No. 200710144970.9 as Chinese patent application, its living beings hopper is arranged on the front end face of burner hearth, described grey slag bucket is arranged on the front end face of living beings hopper, the setting height(from bottom) of described living beings hopper is H, the setting height(from bottom) of described grey slag bucket is B, the setting height(from bottom) H of described living beings hopper is greater than the setting height(from bottom) B of grey slag bucket, and described fire grate device is arranged on the below of living beings hopper and grey slag bucket.Its applicant thinks: adopt living beings hopper and grey slag bucket simultaneously, thereby realized that ash bed is following, biomass fuel is in last fuel distribution, avoid problems such as the easy scaling loss of fire grate of existing chain-grate boiler, perishable and non-complete combustion of fuel, and obtained better economic, environment and social benefit.But, by above content we as can be seen, therefore above-mentioned patented technology will adopt lime-ash to protect fire grate specially, causes the operating cost of equipment higher.

And for example Chinese utility model patent 200720140414.X is disclosed a kind ofly burns fully, the thermal efficiency is high and the horizontal normal pressure fire tube hot-water boiler of the energy saving and environment friendly special bio matter of effective corrosion-resistant fuel direct combustion, and it mainly is made up of burner body, drum, air-introduced machine.Drum is the cylindrical seal container, in the type fire tube is arranged back, its inlet links to each other with stove tube shell and far infrared combustion-supporting, the outlet communicate with air-introduced machine.During use, inject cold water in the drum, start air-introduced machine, behind the ignited fuel moment gasification direct-combustion, volatile matter of separating out from fuel and particulate enter at a high speed the far infrared combustion-supporting from first combustion chamber, blast tube under the effect of air-introduced machine, form eddy current and fully burning under deflector, form the high temperature roaring flame and enter back-shaped fire tube, with conduction pattern the water temperature in the drum is raise rapidly by the super heat-conductive pipe of even distribution on it.But, by above content we as can be seen, above-mentioned patented technology does not disclose how suitably to design the feeding manner of biomass fuel and the air distribution mode of combustion air.

Therefore, be badly in need of providing a kind of burning that is beneficial to biomass fuel and burn, efficiency of combustion is high and burner safe and reliable to operation.

Summary of the invention

Technical problem to be solved by this invention provides a kind of burning of biomass fuel and steam boiler that burns of being beneficial to.

Technical scheme of the present invention is achieved in that provides a kind of biomass-burning steam boiler, and it comprises: boiler body, its be provided with for biomass fuel burn within it heat release burner hearth and be positioned at the heat-exchanger rig of burner hearth top; Feeding system, it links to each other with boiler body and burns so that biomass fuel is sent in the burner hearth; And, the steam-water pipeline system, it links to each other with heat-exchanger rig and swaps out with the heat that biomass combustion is produced; Wherein, be provided with reciprocal grate in the burner hearth, reciprocal grate is with respect to the horizontal plane downward-sloping with the inclination angle of 5~25 degree to the far-end away from feeding system of burner hearth from the near-end of the close feeding system of burner hearth, and the feasible biomass fuel that drops on the fire grate is compressed and produces tumbling motion with respect to fire grate.

Preferably, reciprocal grate is with respect to the horizontal plane downward-sloping with the inclination angle of 10~20 degree to the far-end of burner hearth from the near-end of burner hearth.Particularly, this inclination angle can be selected about 15 degree, and the material of this reciprocal grate is RTSi5 preferably.

The required air of biomass fuel combustion of the present invention is three grades of air distributions.Particularly, further comprise being arranged at lower furnace portion and being positioned at a plurality of first order wind under the reciprocal grate and send into mouthful to send into first order wind to burner hearth.At least one second level wind that further comprises the near-end that is arranged at burner hearth is sent into mouth to send into second level wind in burner hearth.Comprise that further at least one third level wind sends into mouth, third level wind is sent into the place of connection of mouthful close burner hearth and heat-exchanger rig and tangentially is formed on the furnace wall of burner hearth to send into the third level wind of tangential swirl in described burner hearth.Preferably, the air output sent into mouthful of first order wind reduces to the far-end of burner hearth gradually from the near-end of burner hearth.More preferably, the 50%-70% of total wind pushing air amount of biomass-burning steam boiler is a first order wind, and the 20%-40% of total wind pushing air amount is a third level wind, and all the other are second level wind.

Particularly, can be provided with bottom smoke pipe and top smoke pipe in heat-exchanger rig, top smoke pipe and/or bottom smoke pipe are threaded flue.

Preferably, online soot blower be can further be provided with and top smoke pipe and bottom smoke pipe are used for regularly purging.

Particularly, feed system can comprise hopper, star feeder and the screw(-type) feeder that links to each other successively.

The invention has the beneficial effects as follows:

1. adopt high-quality reciprocal grate, the fire grate segment material can be RTSi5, has higher heat-resistant quality, aims at biological particles burning design, and structure is simpler, and is easy to install, safe and reliable to operation.Have characteristics such as cheap, construction time weak point, long service life.The grate surface inclination angle can be 15 °, and the fuel volatile matter that is heated in the fire grate front portion is separated out, and fire grate constantly moves back and forth by governing box, and fire grate and fuel have relative motion simultaneously.Fuel constantly is squeezed in the process that is pushed, thereby destroys coke button and grey shell.Fuel slowly rolls again simultaneously, and the bed of material is become flexible, and helps abundant burning.2. compare with traditional horizontal industrial boiler, this boiler furnace space is big.Because BMF fuel volatile matter height, can pyrolysis separate out volatile matter about 250 °, it is shorter that volatile matter is separated out the time, so there are enough volumes the combustion chamber, and can have firebreak to help blocking fire at the outlet block of burner hearth, make fuel that sufficient combustion space and burning time be arranged.3. the required air of fuel combustion is three grades of air distributions, and first order wind is sent into by the fire grate bottom, and its ratio accounts for 60% of total air, and each air compartment adopts the segmentation air distribution mode of " front portion is many, and middle afterbody is progressively few ".Second level wind is sent into burner hearth by the boiler front portion, helps the volatile combustion that separate out the stokehold, and its ratio accounts for 10% of total air.Third level wind is sent into by the both sides furnace wall of furnace outlet position, forms tangent circle eddy flow wind, and its ratio accounts for 30% of total air.This boiler wind speed adjustment is reasonable, has enough diffused air to supply with, and avoids improper because of the air supply, and the organic volatile branch is not burnt and causes smoke evacuation to be black, is the disadvantage of goldenrod cigarette when serious.4. convection heating surface is that the smoke pipe district is provided with online soot blower, regularly smoke pipe is purged, and can prevent the convection heating surface dust stratification effectively, guarantees the heat-transfer effect of threaded flue.5. can realize automatic igniting, full-automatic operation, fuel metering automatically, the ratio of air and forced-and-induced draft fan frequency are to adapt to the combustion requirements under the different load.6. feed mechanism can comprise drag conveyor, hopper, star feeder and screw(-type) feeder, mechanical automation degree height, and manually-operated is safeguarded simple.

Below in conjunction with drawings and Examples, further specify the present invention, but the present invention is not limited to these embodiment, any on essence spirit of the present invention improvement or substitute, still belong to scope required for protection in claims of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of biomass-burning steam boiler of the present invention.

The specific embodiment

Embodiment 1

Please refer to Fig. 1, biomass-burning steam boiler of the present invention comprises: boiler body 100, its be provided with for biomass fuel burn within it heat release burner hearth 110 and be positioned at the heat-exchanger rig 300 of burner hearth 110 tops; Feeding system 400, it links to each other with boiler body 100 and burns so that biomass fuel is sent in the burner hearth 110; And, steam-water pipeline system (not label), it links to each other with heat-exchanger rig 300 and swaps out with the heat that biomass combustion is produced; Wherein, be provided with the reciprocal grate of making by the RTSi5 material 700 in the burner hearth 110, reciprocal grate 700 is with respect to the horizontal plane downward-sloping with the inclination angle of about 15 degree to the far-end away from feeding system 400 of burner hearth from the near-end of the close feeding system 400 of burner hearth, and the feasible biomass fuel that drops on the reciprocal grate 700 is compressed and produces tumbling motions with respect to reciprocal grate 700.

The required air of biomass fuel combustion of the present invention is three grades of air distributions, specifically comprises: be arranged at burner hearth 110 bottoms and be positioned at a plurality of first order wind under the reciprocal grate 700 and send into mouthful (not label) to send into first order wind to burner hearth 110; At least one second level wind that is arranged at the near-end of burner hearth 110 is sent into mouthful (not label) to send into second level wind in burner hearth 110; And at least one third level wind sends into mouthfuls 150, and third level wind is sent into mouthfuls 150 and also tangentially is formed on the furnace wall of burner hearth 110 to send into the third level wind of tangential swirl in burner hearth near burner hearths 110 and the place of connection of heat-exchanger rig 300.Wherein, the air output sent into mouthful of first order wind reduces to the far-end of burner hearth gradually from the near-end of burner hearth 110.In addition, about 60% of total wind pushing air amount of biomass-burning steam boiler is a first order wind, and about 30% of total wind pushing air amount is a third level wind, and all the other are second level wind.

In addition, be provided with bottom smoke pipe 330 and top smoke pipe 370 in heat-exchanger rig 300, wherein, bottom smoke pipe 330 is a threaded flue.Further be provided with online soot blower 800 and be used for regularly purging top smoke pipe 370 and bottom smoke pipe 330.

Particularly, feed system 400 comprises hopper 410, star feeder 430 and the screw(-type) feeder 450 that links to each other successively.

Biomass-burning steam boiler of the present invention is that horizontal extreme misery pipe three backhauls are arranged.In use, fuel enters the hopper 410 of stokehold by feed system 400, through entering screw(-type) feeder 450 after star feeder 430 controls, sends into burner hearth 110 at last.Fuel in burner hearth fully the burning back produce flue gas flush water cold wall pipe (not shown) backward in the past, be then through bottom smoke pipe 330 from after flow to the front smoke box (not shown) forward, from front smoke box (not shown) smoke box (not shown) after top smoke pipe 370 flows into from front to back, enter back-end ductwork and after the heat exchange of cast iron gilled tube economizer (not shown) is carried out clarifying smoke by the deduster (not shown) again, discharge again by chimney.This biomass-burning steam boiler adopts the reciprocal grate of function admirable, and boiler wind speed adjustment adopts three grades of layouts, the burning that is beneficial to biomass fuel with burn.The boiler second backhaul smoke pipe adopts the threaded flue that is beneficial to the flue gas disturbance, can effectively alleviate the dust stratification in the flow of flue gas process.Regularly adopt pressure-air to purge to Boiler smoke tube, guarantee the efficient stable operation of boiler.This boiler structure is arranged compact, and fast-assembling is safe and reliable to operation.

Embodiment 2

As another kind of scheme of the present invention, other parts are identical with embodiment 1, and difference is:

The material of this reciprocal grate is made by other refractory material except that RTSi5.

This reciprocal grate 700 is with respect to the horizontal plane downward-sloping with the inclination angle of about 20 degree to the far-end away from feeding system 400 of burner hearth from the near-end of the close feeding system 400 of burner hearth.

About 50% of total wind pushing air amount of biomass-burning steam boiler is a first order wind, and about 35% of total wind pushing air amount is a third level wind, and about 15% of total wind pushing air amount is a third level wind.

Outlet block at burner hearth has firebreak to help blocking fire, makes fuel that sufficient combustion space and burning time be arranged.

Claims (10)

1. biomass-burning steam boiler comprises:
Boiler body, its be provided with for biomass fuel burn within it heat release burner hearth and be positioned at the heat-exchanger rig of described burner hearth top;
Feeding system, it links to each other with described boiler body and burns so that biomass fuel is sent in the described burner hearth; And
The steam-water pipeline system, it links to each other with described heat-exchanger rig and swaps out with the heat that biomass combustion is produced;
It is characterized in that:
Be provided with reciprocal grate in the described burner hearth, described reciprocal grate is with respect to the horizontal plane downward-sloping with the inclination angle of 5~25 degree to the far-end away from described feeding system of described burner hearth from the near-end of the close described feeding system of described burner hearth, and the feasible biomass fuel that drops on the described reciprocal grate is compressed and produces tumbling motion with respect to described reciprocal grate.
2. biomass-burning steam boiler as claimed in claim 1 is characterized in that, the material selection RTSi5 of described reciprocal grate, and described reciprocal grate is with respect to the horizontal plane downward-sloping with the inclination angle of 10~20 degree to the far-end of described burner hearth from the near-end of described burner hearth.
3. biomass-burning steam boiler as claimed in claim 1, it is characterized in that, comprise that further at least one third level wind sends into mouth, described third level wind is sent into the place of connection of mouthful close described burner hearth and described heat-exchanger rig and tangentially is formed on the furnace wall of described burner hearth to send into the third level wind of tangential swirl in described burner hearth.
4. biomass-burning steam boiler as claimed in claim 3 is characterized in that, further comprises being arranged at described lower furnace portion and being positioned at a plurality of first order wind under the described reciprocal grate sending into mouthful to send into first order wind to described burner hearth.
5. biomass-burning steam boiler as claimed in claim 4 is characterized in that, the air output that described first order wind is sent into mouthful reduces to the far-end of described burner hearth gradually from the near-end of described burner hearth.
6. biomass-burning steam boiler as claimed in claim 5 is characterized in that, comprises that further at least one second level wind of the near-end that is arranged at described burner hearth is sent into mouth to send into second level wind in described burner hearth.
7. biomass-burning steam boiler as claimed in claim 6, it is characterized in that, the 50%-70% of total wind pushing air amount of described biomass-burning steam boiler is described first order wind, and the 20%-40% of total wind pushing air amount is described third level wind, and all the other are described second level wind.
8. biomass-burning steam boiler as claimed in claim 1 is characterized in that, is provided with bottom smoke pipe and top smoke pipe in the described heat-exchanger rig, and described top smoke pipe and/or described bottom smoke pipe are threaded flue.
9. biomass-burning steam boiler as claimed in claim 8 is characterized in that, further is provided with online soot blower and is used for regularly purging described top smoke pipe and described bottom smoke pipe.
10. as the described biomass-burning steam boiler of one of claim 1~9, it is characterized in that described feed system comprises hopper, star feeder and the screw(-type) feeder that links to each other successively.
CN2009100392030A 2009-05-05 2009-05-05 Steam boiler capable of burning biomass CN101881433A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103322582A (en) * 2013-06-08 2013-09-25 北京奥科瑞丰新能源股份有限公司生物质能研究院 Biomass drying oven
CN103528089A (en) * 2013-10-18 2014-01-22 山西亿能节能科技服务有限公司 Method and device for controlling coal fired boiler wind pressure changing combustion
CN104501171A (en) * 2014-12-24 2015-04-08 山东华源锅炉有限公司 RDF (refuse derived fuel) pyrolysis and gasification system
CN104654266A (en) * 2015-02-09 2015-05-27 昌图县锅炉制造厂 Water boiler with single boiler barrel and four return strokes
CN105571118A (en) * 2015-12-24 2016-05-11 江苏大学 Biomass hot water boiler
CN106765143A (en) * 2016-12-19 2017-05-31 航天凯天环保科技股份有限公司 A kind of small-sized rubbish pyrogenation incinerator and its treating tail gas system and application

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103322582A (en) * 2013-06-08 2013-09-25 北京奥科瑞丰新能源股份有限公司生物质能研究院 Biomass drying oven
CN103528089A (en) * 2013-10-18 2014-01-22 山西亿能节能科技服务有限公司 Method and device for controlling coal fired boiler wind pressure changing combustion
CN104501171A (en) * 2014-12-24 2015-04-08 山东华源锅炉有限公司 RDF (refuse derived fuel) pyrolysis and gasification system
CN104501171B (en) * 2014-12-24 2017-09-29 山东华源锅炉有限公司 Garbage derivatived fuel (RDF) pyrolysis gasification system
CN104654266A (en) * 2015-02-09 2015-05-27 昌图县锅炉制造厂 Water boiler with single boiler barrel and four return strokes
CN105571118A (en) * 2015-12-24 2016-05-11 江苏大学 Biomass hot water boiler
CN106765143A (en) * 2016-12-19 2017-05-31 航天凯天环保科技股份有限公司 A kind of small-sized rubbish pyrogenation incinerator and its treating tail gas system and application

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