CN104235833A - Transformed novel boiler for burning rice husk and method for producing thermal insulation covering agent by using novel boiler - Google Patents
Transformed novel boiler for burning rice husk and method for producing thermal insulation covering agent by using novel boiler Download PDFInfo
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- CN104235833A CN104235833A CN201410395089.6A CN201410395089A CN104235833A CN 104235833 A CN104235833 A CN 104235833A CN 201410395089 A CN201410395089 A CN 201410395089A CN 104235833 A CN104235833 A CN 104235833A
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Abstract
The invention discloses a transformed novel boiler for burning rice husk. The novel boiler comprises a fuel nozzle and a front arch matched with the fuel nozzle, wherein a lug boss is formed at one end, which is close to the inner side of a hearth, of the front arch. The rice husk ash with a certain fixed carbon content generated by burning the rice husk in the boiler has high economic value, can be applied to the field of metal smelting industries such as continuous casting, thermal insulation of RH and other various ladles, thermal insulation of reinforced riser molten metal top surface dusting powder and thermal insulation of continuous casting Tundishes and is used for preventing oxidization of the molten iron surface of agglomeration killed steel. Moreover, the novel boiler has the characteristics of excellent burning property, low thermal conductivity, high heat breakage rate, high heat, good thermal insulation effect, good diffusivity and small original used units.
Description
Technical field
The present invention relates to boiler and change combustion technology field.More specifically, relate to a kind of New-type boiler of reworked combusting rice hull and produce the method for thermal-insulating covering agent with it.
Background technology
Existing combustion coal chain boiler great majority adopt bituminous coal to make fuel, and energy consumption is large, and smoke discharge amount is large, and contaminated environment, the thermal efficiency is lower.Also part miniature boiler is had to do the transformation being changed combustion rice husk by fire coal, but exist to run and do not reach product, fire box temperature compared with low, that fume amount is large, fuel availability is low problem, the lime-ash produced in addition can not obtain effectively and reasonably, high value added utilization, affects environment.The combustion coal chain boiler that the present invention be directed to original less than 35 tons is transformed, and face arch is mated with burner, is more suitable for using rice husk as fuel.
Summary of the invention
First technical problem that the present invention will solve is to provide a kind of New-type boiler of reworked combusting rice hull.This boiler utilizes existing combustion coal chain boiler to transform, make it possess and use rice husk condition, adopt burner wind model rice husk, adopt suspending pyrogenation technology, coke after pyrolysis contraction is deposited on grate and burns away, also initial ulking thickness and the flying dust share of bed is significantly reduced while improve bed stability, and can under the prerequisite ensureing normal operation of boiler, by adjustment boiler operatiopn duty parameter, obtain the metal smelt industry thermal-insulating covering agent (the rice husk carbon that phosphorus content is higher) meeting quality criteria requirements.After project reconstruction completes operation, 1 ton of rice husk while production 3.5 tons of steam (≤2.5MPa), attached product 150-200kg thermal-insulating covering agent.
Second technical problem that the present invention will solve is to provide a kind of method utilizing above-mentioned boiler for producing thermal-insulating covering agent.
For solving above-mentioned first technical problem, the present invention adopts following technical proposals:
A New-type boiler for reworked combusting rice hull, comprises hopper, fire grate, fuel delivery system and burner hearth; The outlet of described fuel delivery system is connected with the upper end of hopper, it is characterized in that: also comprise burner and be located at the face arch that burner hearth import department and burner match, described face arch is provided with boss in the one end inside burner hearth, described burner is arranged on the lower end of described hopper, the below of described burner is fire grate), burner hearth import department is located at by described burner.
Preferably, described face arch to be combined the arch formed by tilting section and horizontal segment, and the length of the tilting section of described face arch accounts for 30% of face arch total length, and angle is 45 °.
Preferably, described burner is notch cuttype, and burner outlet is partitioned into three nozzles from top to bottom by dividing plate, and dividing plate is cascade arrangement; The width of described burner is 90-250mm, and fuel transport distance is 500-1000mm, and the spacing between dividing plate is 180-450mm; The air outlet velocity of described burner is 20m/s, and excess air coefficient is 1.3; Described burner has three at least, and described fire grate air quantity accounts for 60% of total blast volume.
Preferably, the height of described boss is 100-200mm; Gap between the lower surface of described hopper and fire grate upper surface is 15-35cm, and the feeding speed of described fire grate is 10-15 m/h.
The bulk density of rice husk is 96-160kg/m3,1/5 of not enough coal, low heat valve is 3400kcal/kg, is about 60% of raw coal, in identical thermal efficiency situation, reach identical combustion power, in burner hearth, the volume of rice husk need be 8-10 times of coal, even if when using rice husk, fire grate speed is coal-fired 2 times, when ensureing normal combustion load, the 4-5 when ulking thickness of fuel bed is also fire coal doubly, should reach more than 500mm and just can reach nominal output.After changing rice hull fuel into, even if coal flashboard is mentioned the burning load that peak (200-300mm) can not meet boiler.Rice hull fuel is compared with coal, and volatile matter content, up to 70%, catches fire easily, but fixed carbon burns comparatively difficulty, and original boiler is for rice hull fuel bad adaptability.
Arch design of the present invention, while consideration combusting rice hull characteristic, will be mated with burner, better to organize stove combustion.Rice husk sprays into burner hearth by burner, be settled down on fire grate after clashing into face arch, the volatile matter content of rice husk is high, catch fire easily, primary zone is forward, and part rice husk obtains dry and pyrolysis contraction in flight course, and the fuel gas that pyrolysis produces further promotes the carrying out of this process, due to can about 50% be shunk after rice husk thermal decomposition, the fuel depth on grate is also made to reduce to some extent.
Face arch of the present invention adopts tilting section to combine with horizontal segment arch, tilting section is in order to better and burner match, the total length (a segment length) of face arch extends, b section plays the effect of banking fire, move after impelling ignition point, in order to avoid burn out coal flashboard and coal bunker, play the effect supporting burner simultaneously.
For solving above-mentioned second technical problem, a kind of method utilizing the New-type boiler of above-mentioned reworked combusting rice hull to produce thermal-insulating covering agent of the present invention, comprises the steps:
Rice husk enters burner hearth through burner 1, sedimentation after buttress before part rice husk clashes into, and another part throws wall-jets along with material spray wind forms one at face arch wall, sedimentation after the boss 3 in shock face arch exit; Rice husk constantly absorbs heat entering burner hearth in the process of sedimentation, through burning and pyrolytic process, in pyrolytic process, rice husk starts to shrink, make mutually level bed have been piled up more coke, the volatilization burning simultaneously produced consumes a large amount of air, hinders the diffusion of oxygen to coke surface, hinders coke burning; Coke is deposited to after above fire grate 5, by blower variable frequency and each air compartment airdoor control fire grate air quantity, and the phosphorus content of lime-ash is controlled by the residing time in furnace of rice husk coke, in running under the prerequisite ensureing volatile combustion, control air blast air quantity and be less than 30% of nominal air delivery, rear arch area air door Close All, obtains the commodity thermal-insulating covering agent meeting quality criteria requirements.Thermal-insulating covering agent is come out of the stove and is adopted original coal-fired slag-tapping system, mark collation package warehouse-in after cooling.
Beneficial effect of the present invention is as follows:
Devise scientific and reasonable boiler front arch arch modification scheme, burner feed scheme, boiler operatiopn process control method, propose the auxiliary plan of feedstock transportation, dust pelletizing system simultaneously.After having transformed operation, ton rice husk steam production can reach more than 3.5 tons, can produce more than thermal-insulating covering agent 150kg.Boiler thermal output is more coal-fired improves more than 5%, the more coal-fired decline more than 90% of sulfur dioxide in flue gas discharge capacity, production of steam cost is more coal-fired declines more than 20%, thermal-insulating covering agent market price is at about 1000 yuan/ton, bring new growth engines again, overall economic efficiency improves more than 50% before comparatively transforming.Both having solved combustion coal chain boiler adopts bituminous coal to make fuel, and energy consumption is large, and smoke discharge amount is large, contaminated environment, the problem that the thermal efficiency is lower.Also solve after part miniature boiler done and change the transformation of combustion rice husk by fire coal, the fluctuation of service of existence, fire box temperature are compared with low, that fume amount is large, fuel availability is low problem.The fuel that the present invention uses is agricultural wastes, belongs to regenerative resource, facilitates the comprehensive utilization of agricultural wastes, meets the relevant energy-saving and emission-reduction policy of country.Applied widely, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is structural representation of the present invention;
Fig. 2 is face arch of the present invention and burner scheme of installation;
Fig. 3 is the agent structure schematic diagram of burner of the present invention.
In figure, 1-burner, 2-face arch, 3-boss, 4-hopper, 5-fire grate, 6-fuel delivery system,
Detailed description of the invention
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
See Fig. 1 to Fig. 3, the New-type boiler of reworked combusting rice hull of the present invention, boiler arranges the face arch 2 matched with burner 1, face arch 2 closes by tilting section and horizontal segment phase structure the arch formed, and it is highly 100-200mm (height boss 3 d) in Fig. 2 that the outlet of face arch 2 is provided with; In the lower end of the hopper 4 of boiler, burner 1 is set; Gap between the lower surface of hopper 4 and fire grate 5 upper surface is 15-35cm, and fire grate 5 feeding speed is 10-15 m/h; The side of boiler arranges mechanical type fuel delivery system 6.
The length of the tilting section of face arch 2 accounts for 30% of face arch total length, and angle (i.e. α) is 45 °.
Face arch of the present invention adopts tilting section to combine with horizontal segment arch, tilting section be in order to better and burner match, the total length prolongation 20% of face arch, b section plays the effect of banking fire, move after impelling ignition point, in order to avoid burn out coal flashboard and coal bunker, play the effect supporting burner simultaneously.A section design length extended 20% more originally.The boss height of arch: 4,6,10,15,20,35T/H boiler respectively by 50,70,90,120,150,200mm design.The height h of face arch does not change.Tilting section length accounts for 30% of face arch total length, and increasing in the outlet of front arch area is in addition highly 100-200mm boss, can change the flow trace of front arch area wall-jets, increase disturbance and the time of staying of this strand of jet.The present invention adopts Pneumatic feeding, the coverage rate of front arch area is improved, improve front arch area temperature levels, promote the carrying out of pyrolytic process, rice hull fuel is made to complete pyrolysis largely in furnace cavity, then shrink sedimentation, feed air-flow not only increases the disturbance of front arch area, also can effectively prevent microexplosion from firing.
Burner 1 is notch cuttype, and burner outlet is partitioned into three nozzles from top to bottom by dividing plate, and dividing plate is cascade arrangement; The width of described burner 1 is 90-250mm, and fuel transport distance is 500-1000mm, and the spacing between dividing plate is 180-450mm; The air outlet velocity of described burner 1 is 20m/s, and excess air coefficient is 1.3; Described burner 1 has three at least, and described fire grate air quantity accounts for 60% of total blast volume.
The Main Function of burner is that rice husk is blown into burner hearth from hopper, and rice husk is evenly distributed on burner hearth plane of structure.Consider rice husk rough surface, poor fluidity, long distance delivery and break-in all can increase the possibility that rice husk blocks in the duct, and the present invention makes the transportation range of rice husk in burner be 500-1000mm, in order to ensure the stability of carrying, devise three grades of nozzles to ensure smooth delivery of power.The upwards take-off of burner Way out half, air-flow forms one along face arch buttress and throws wall-jets, and second half adopts block piece to organize the flight path of rice husk in burner hearth.Boiler between steam production 4-15T/H adopts three burner designs, and both sides width is between 90-250mm, and intermediate width is between 180-450mm.Boiler between steam production 20-35T/H adopts five burner designs, and both sides width is between 90-250mm, and middle three width are between 180-450mm.Point fire grate coal bunker plane of structure such as all burners.Spray gas outlet wind speed is 20m/s, and excess air coefficient is by 1.3, and for ensureing the cooling degree of fire grate, fire grate air quantity presses 60% of total blast volume.Burner material spray blower fan is arranged according to boiler grate blower air quantity and blast, and air quantity adopts frequency conversion to reconcile and controls.Burner total length and each flow-stopping plate length in-site measurement are determined, arc outlet is located in face arch tilting section starting point, and arc outlet radian is 45 °.4,6,10,15T/H boiler erection three burners, broad in the middle, small in ends; 20,25,35T/H boiler erection five burners, middle three large, small in ends.Point fire grate coal bunker plane of structure such as each burner center.Model same with fire grate air blast selected by the supporting air blast of spray fuel, adopts VFC air quantity and blast, and spray gas outlet wind speed is about 20m/s.
6,10,15,20,35T/H boiler burner physical dimension sees the following form:
| ? | Width n | Flange height h | Height a | Height b | Height g | The wide m of flange |
| 6T/H boiler both sides | 100 | 400 | 100 | 70 | 40 | 150 |
| In the middle of 6T/H boiler | 200 | 400 | 100 | 70 | 40 | 250 |
| 10T/H boiler both sides | 180 | 400 | 100 | 70 | 40 | 260 |
| In the middle of 10T/H boiler | 350 | 400 | 100 | 70 | 40 | 430 |
| 15T/H boiler both sides | 300 | 400 | 100 | 70 | 40 | 380 |
| In the middle of 15T/H boiler | 450 | 400 | 100 | 70 | 40 | 530 |
| 20T/H boiler both sides | 300 | 400 | 100 | 70 | 40 | 380 |
| In the middle of 20T/H boiler | 450 | 400 | 100 | 70 | 40 | 530 |
| 35T/H boiler both sides | 400 | 400 | 100 | 70 | 40 | 480 |
| In the middle of 35T/H boiler | 550 | 400 | 100 | 70 | 40 | 630 |
The present invention adopts mechanical type fuel delivery system 6 to carry rice husk, comprises bucket elevator and conveying worm, and lectotype selection produces 3 tons of steam designs by 1 ton of rice husk, and the bulk density of rice husk presses 120kg/m3 design.The speed of service regulates and adopts VFC.Flue gas dust collecting system adopts the mode of ceramic multi-tube dedusting and water film dedusting series connection, and can ensure flue dust qualified discharge, particular/special requirement can select sack cleaner.Lectotype selection selection and the adaptive model of boiler nominal production capacity.
A kind of method of the New-type boiler attached product thermal-insulating covering agent of above-mentioned reworked combusting rice hull that utilizes is as follows:
Rice husk enters burner hearth through burner 1, sedimentation after buttress before part rice husk clashes into, and another part throws wall-jets along with material spray wind forms one at face arch wall, sedimentation after the boss 3 in shock face arch exit; Rice husk constantly absorbs heat entering burner hearth in the process of sedimentation, through burning and pyrolytic process, in pyrolytic process, rice husk starts to shrink, make mutually level bed have been piled up more coke, the volatilization burning simultaneously produced consumes a large amount of air, hinders the diffusion of oxygen to coke surface, hinders coke burning; Coke is deposited to after above fire grate 5, by blower variable frequency and each air compartment airdoor control fire grate air quantity, and the phosphorus content of lime-ash is controlled by the residing time in furnace of rice husk coke, in running under the prerequisite ensureing volatile combustion, control air blast air quantity and be less than 30% of nominal air delivery, rear arch area air door Close All, obtains the commodity thermal-insulating covering agent meeting quality criteria requirements.Thermal-insulating covering agent is come out of the stove and is adopted original coal-fired slag-tapping system, mark collation package warehouse-in after cooling.Thermal-insulating covering agent refers to the lime-ash meeting following quality standard: fixed carbon content >=35%, bulk density≤0.16g/cm3, thermal conductivity factor 0.023 ~ 0.039, moisture content≤0.8.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (5)
1. a New-type boiler for reworked combusting rice hull, comprises hopper (4), fire grate (5), fuel delivery system (6) and burner hearth; The outlet of described fuel delivery system (6) is connected with the upper end of hopper (4), it is characterized in that: also comprise burner (1) and be located at the face arch (2) that burner hearth import department and burner (1) match, described face arch (2) is provided with boss (3) in the one end inside burner hearth, described burner (1) is arranged on the lower end of described hopper (4), the below of described burner (1) is fire grate (5), and burner hearth import department is located at by described burner (1).
2. the New-type boiler of reworked combusting rice hull according to claim 1, it is characterized in that: described face arch (2) to be combined the arch formed by tilting section and horizontal segment, the length of the tilting section of described face arch (2) accounts for 30% of face arch total length, and angle is 45 °.
3. the New-type boiler of reworked combusting rice hull according to claim 1, is characterized in that: three grades of nozzles that described burner (1) is notch cuttype, and burner outlet is partitioned into three nozzles from top to bottom by dividing plate, and dividing plate is cascade arrangement; The width of described burner (1) is 90-250mm, and fuel transport distance is 500-1000mm, and the spacing between dividing plate is 180-450mm; The air outlet velocity of described burner (1) is 20m/s, and excess air coefficient is 1.3; Described burner (1) has three at least, and described fire grate air quantity accounts for 60% of total blast volume.
4. the New-type boiler of reworked combusting rice hull according to claim 1, is characterized in that: the height of described boss (3) is 100-200mm; Gap between the lower surface of described hopper (4) and fire grate (5) upper surface is 15-35cm, and the feeding speed of described fire grate (5) is 10-15 m/h.
5. utilize the New-type boiler of the reworked combusting rice hull described in claim 1 to produce a method for thermal-insulating covering agent, it is characterized in that, comprise the steps:
1) rice husk enters burner hearth, rice husk sedimentation through hopper and burner (1);
2) rice husk constantly absorbs heat entering burner hearth in the process of sedimentation, through burning and pyrolysis, makes mutually level bed have been piled up more coke;
3) coke is deposited to after above fire grate (5), by blower variable frequency and each air compartment airdoor control fire grate air quantity, and the phosphorus content of lime-ash is controlled by the residing time in furnace of rice husk coke, control air blast air quantity and be less than 30% of nominal air delivery, rear arch area air door Close All, obtains thermal-insulating covering agent.
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| CN201410395089.6A CN104235833B (en) | 2014-08-12 | 2014-08-12 | Transformed boiler for burning rice husk and method for producing thermal insulation covering agent by using boiler |
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| CN201410395089.6A CN104235833B (en) | 2014-08-12 | 2014-08-12 | Transformed boiler for burning rice husk and method for producing thermal insulation covering agent by using boiler |
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| CN104235833B CN104235833B (en) | 2017-02-15 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87211159U (en) * | 1987-07-31 | 1988-12-28 | 哈尔滨锅炉工业公司 | Rice hull compound combustion boiler |
| JP2006112687A (en) * | 2004-10-13 | 2006-04-27 | Takada Engineering:Kk | Multistage fluidized bed combustion method for rice hull |
| CN201103917Y (en) * | 2007-08-22 | 2008-08-20 | 刘胜康 | Chaff injector for coal-fired boiler |
| CN101354130A (en) * | 2007-07-25 | 2009-01-28 | 李建胜 | Method for combusting rice hull using existing chain industry boiler |
| CN102732276A (en) * | 2012-06-21 | 2012-10-17 | 安徽明太生物科技有限公司 | Rice husk direct-combustion and carbonization combination apparatus |
| CN202546813U (en) * | 2012-04-16 | 2012-11-21 | 湖南省新沙锅炉有限公司 | Multi-functional fixed fire grate boiler device |
| CN202598580U (en) * | 2012-04-11 | 2012-12-12 | 哈尔滨哈东新春锅炉有限公司 | Interchangeable arch of biomass and coal |
| CN202813757U (en) * | 2012-09-04 | 2013-03-20 | 姜平 | Rice hull burning air heating furnace |
-
2014
- 2014-08-12 CN CN201410395089.6A patent/CN104235833B/en not_active Expired - Fee Related
Patent Citations (8)
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|---|---|---|---|---|
| CN87211159U (en) * | 1987-07-31 | 1988-12-28 | 哈尔滨锅炉工业公司 | Rice hull compound combustion boiler |
| JP2006112687A (en) * | 2004-10-13 | 2006-04-27 | Takada Engineering:Kk | Multistage fluidized bed combustion method for rice hull |
| CN101354130A (en) * | 2007-07-25 | 2009-01-28 | 李建胜 | Method for combusting rice hull using existing chain industry boiler |
| CN201103917Y (en) * | 2007-08-22 | 2008-08-20 | 刘胜康 | Chaff injector for coal-fired boiler |
| CN202598580U (en) * | 2012-04-11 | 2012-12-12 | 哈尔滨哈东新春锅炉有限公司 | Interchangeable arch of biomass and coal |
| CN202546813U (en) * | 2012-04-16 | 2012-11-21 | 湖南省新沙锅炉有限公司 | Multi-functional fixed fire grate boiler device |
| CN102732276A (en) * | 2012-06-21 | 2012-10-17 | 安徽明太生物科技有限公司 | Rice husk direct-combustion and carbonization combination apparatus |
| CN202813757U (en) * | 2012-09-04 | 2013-03-20 | 姜平 | Rice hull burning air heating furnace |
Non-Patent Citations (1)
| Title |
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| 王光盛等: "燃煤燃稻壳两用炉的改进设计", 《现代化农业》, no. 8, 15 August 1999 (1999-08-15), pages 36 * |
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