CN103411206A - Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system - Google Patents
Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system Download PDFInfo
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- CN103411206A CN103411206A CN2013103472601A CN201310347260A CN103411206A CN 103411206 A CN103411206 A CN 103411206A CN 2013103472601 A CN2013103472601 A CN 2013103472601A CN 201310347260 A CN201310347260 A CN 201310347260A CN 103411206 A CN103411206 A CN 103411206A
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Abstract
The invention discloses a chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system. The chain grate boiler comprises air chambers, a grate, a coal bed, a front arch, limestone nozzles, a rear arch, a hearth, a front boiler wall, a rear boiler wall, a left boiler wall, a right boiler wall and a secondary air spray pipe system. The secondary air spray pipe system includes an upper layer and a lower layer disposed on the front and rear arches and the left and right boiler walls respectively in a staggering manner. The limestone nozzles are opposing positions of the front and rear boiler walls in the hearth zone at 800 DEG C and are installed by tilting up at 20 degrees. The chain grate boiler has the advantage that emission concentration of nitric oxide and sulfur dioxide is further decreased.
Description
Technical field
The present invention relates to a kind of with bilayer dislocation Secondary Air jet pipe and agstone lance system
Chain-grate boiler, relate to the fields such as the energy and thermal power engineering.
Background technology
Existing chain-grate boiler comprises fire grate, coal seam, face arch, rear arch.During coal combustion, there are nitrogen oxide and sulfur dioxide to generate.The discharge of nitrogen oxide is very large on human respiratory tract's impact, may bring out cancer, but not cause enough attention, CN200820059852 discloses a kind of composite secondary air apparatus for chain boiler combustion, its structural representation as shown in Figure 1 and Figure 2, aditus laryngis place at front chimney arch and rear chimney arch composition arranges respectively an air main 7, at each air main 7 place, 3 arms 9 are set respectively, liquidate in twos, promote the mixing of flue gas, be conducive to the after-flame of combustible, on the chimney arch of aditus laryngis upper position and side wall, wind jet pipe 5 is set respectively, wind jet pipe 6, being 45 degree arranges, from this wind jet pipe 5, at freeze profile, become the circle of an illusion with the Secondary Air that wind jet pipe 6 penetrates, with a wind air quantity reasonable coordination, reduce the discharge of nitrogen oxide, this composite secondary air apparatus for chain boiler combustion is in conjunction with the flow behavior of fluid and the heat transmitting in grate-fired furnace, promote the flue gas body in burner hearth to mix, reduce the discharge of fuel gas and carbon black, reduce unburned carbon in flue dust, reduce the discharge of nitrogen oxide, reached the effect of certain energy-conserving and environment-protective.But owing to not considering to arrange the shower nozzle of agstone, can not reduce the discharge of sulfur dioxide in this composite secondary air apparatus for chain boiler combustion.While chimney arch place composite secondary air apparatus too complexity causes the inner air tube mass flow discrepancy even, and flue gas viscosity makes greatly the circle of more difficult formation illusion.Therefore exist can not work in coordination with reduce sulfur dioxide (SO2) emissions and reduce further that nitrogen oxide generates and discharge technical problem.
Summary of the invention
Purpose of the present invention is in order to solve above-mentioned collaborative reducing emission of sulfur dioxide, the chain-grate boiler with bilayer dislocation Secondary Air and agstone lance system that further reduces the technical problem of nitrogen oxide generation and discharge etc. and propose, by this dislocation of bilayer with the chain-grate boiler of bilayer dislocation Secondary Air jet pipe and agstone lance system Secondary Air jet pipe, can effectively destroy the formation condition of nitrogen oxide in stove, reduce generation and the discharge of nitrogen oxide, reach the effect of environmental protection, the lime stone sprayed into by the agstone lance system simultaneously is cracked into calcium oxide, calcium oxide reacts generation calcium sulfate with the sulfur dioxide in flue gas, thereby further remove the sulfur dioxide in flue gas.Should with the chain-grate boiler of bilayer dislocation Secondary Air jet pipe and agstone lance system optimized from the air under fire grate with from the mixing of coal volatile matter, reduce the discharge of combustible and carbon black, reduce unburned carbon in flue dust, the raising boiler efficiency.
Know-why of the present invention
A kind of chain-grate boiler with double-deck wrong row's Secondary Air jet pipe and agstone lance system, to reduce the generation of nitrogen oxide in stove, reach the effect of denitration, and this is a kind of upgrading of conventional Secondary Air; Conventional Secondary Air is simple from strengthening the flue gas mixing, and it is unreasonable that spout is set, and effect is undesirable.In the present invention, send in two stages by the air of the use of burning, at first total air is sent into to burner hearth from the air compartment under the fire grate of primary zone by a certain percentage, make burning be in anaerobic condition in primary zone, thereby reduce ignition temperature, generate carbon monoxide; And the volatile matter nitrogen in fuel decomposes generation a large amount of HN, HCN, NH
3And NH
2Deng, they or mutual composition generation N
2Or with the nitrogen oxide generation reduction reaction generated, thereby suppressed the generation of nitrogen oxide.Then, the part Secondary Air is sent into from the upper strata overfire air port to after-flame is lower due to flame temperature in this zone so that fuel enters the air excess zone, thus a large amount of nitrogen oxide can not generated yet, thereby total formation of nitrogen oxides and discharge capacity descend.
Be of the present invention a kind of with double-deck wrong Secondary Air jet pipe and the agstone lance system of arranging
Chain-grate boilerBy having strengthened mixing of flue gas and air, the spout that Dual-layer liquidates in twos is set, the layout that is staggered, be conducive to the after-flame of combustible, reduced the discharge of combustible and carbon black, reduced unburned carbon in flue dust; In primary zone, cause fuel-rich combustion, in the Secondary Air zone by the combustible after-flame, destroyed the condition that nitrogen oxide generates, but higher for hypoxgia in the primary zone temperature, still temperature is not high in Secondary Air district air abundance, the condition of having avoided two of high temperature and oxygen enrichments to generate nitrogen oxide meets simultaneously, has reduced generation and the discharge of nitrogen oxide, thereby has reached the effect of denitration.
In addition, a kind of chain-grate boiler with double-deck wrong row's Secondary Air jet pipe and agstone lance system of the present invention, desulfurization is exactly to the various CaCO of furnace injection in combustion process
3, CaO, carbide slag and the slag, slag etc. that are rich in metal oxide are as sulphur-fixing agent, then by it in the Industrial Boiler internal combustion, the SO that coal combustion produces
2Just also do not have to overflow with coal in the sulphur-fixing agent generation chemical reaction of calcic, generate the solid sulfur phase hydrochlorate, with slag, discharge, thereby minimizing sulfur dioxide enters atmosphere and contaminated environment with flue gas.The chemical equation of sulphur-fixing agent is:
CaCO
3(calcining) → CaO+CO
2– 183 kJ/mol
CaO + SO
2 +
O
2 → CaSO
4 + 486183 kJ / mol
Burning is when agstone is sprayed onto burner hearth in behind suitable position, as long as temperature is higher than 750 ℃, lime stone can the quick roasting of quilt and form calcium oxide.CaO is in the temperature range of 800～1200 ℃ and SO
2Meet and will carry out desulphurization reaction and generate CaSO
4, at 800 ℃ of region divisions of fire box temperature, the 20 ℃ of angle opposite-flushing type agstone shower nozzles that tilt obliquely, the sulfur dioxide that has extended pulverized limestone and generation carries out the reaction time of desulphurization reaction, generates calcium sulfate, gets rid of burner hearth with slag, thereby reaches the effect of desulfurization.And the desulfurization of this kind method is good to the adaptability that boiler load changes, invest low, equipment simple, the occupation of land is little, can slough simultaneously SO
2/ SO
3, the multiple pollutants such as HCl, HF, flue gas keeps dry state, without anticorrosion, without hot again, directly smoke stack emission of the flue gas after purification, all materials (comprising desulfurization product) are all dry states, be highly susceptible to collecting, transport and stack, without wastewater treatment, operating cost is lower.
Technical scheme of the present invention
A kind of chain-grate boiler with double-deck wrong row's Secondary Air jet pipe and agstone lance system, comprise air compartment, fire grate, coal seam, front chimney arch, the shower nozzle of agstone, rear chimney arch, burner hearth, wall after boiler front wall, boiler, the left wall of boiler, the right wall of boiler and Secondary Air lance system;
Described Secondary Air lance system is upper and lower two-layer Secondary Air lance system, and arranged in dislocation is at forward and backward chimney arch, on left and right side wall respectively;
The shower nozzle of described agstone is located at after boiler front wall that fire box temperature is 800 ℃ of zones, boiler relative position on wall, and install at the 20 ℃ of angles that are inclined upwardly;
The Secondary Air lance system of the lower floor in the Secondary Air lance system of described upper and lower two-layer dislocation is included on the left wall of boiler, the right wall of boiler 2 of arranging respectively each the set arm on airduct and 1 supervisor who arranges respectively in front chimney arch, rear chimney arch and every supervisor that liquidates and forms;
2 biconjugates that arrange respectively on upper set each arm of 1 supervisor who arranges respectively in front chimney arch, rear chimney arch and every supervisor and the left wall of boiler, the right wall of boiler rush airduct and amount to 10 airducts on same absolute altitude, every supervisor is provided with 2 arms corresponding to position, with convenient air, be ejected in burner hearth from arm, Secondary Air along the arm ejection liquidates in twos, two biconjugates that are provided with left and right side wall place rush the wind that secondary air channel blows out and combine, and have strengthened mixing that should the zone flue gas and have flowed;
The Secondary Air lance system on the upper strata in the Secondary Air lance system of described upper and lower two-layer dislocation, namely be included in each 1 list arranged of correspondence position on front chimney arch, rear chimney arch to blowing on the left wall of secondary air channel and boiler, the right wall of boiler each 1 list arranged of correspondence position to blowing secondary air channel, amount to 4 lists identical to the absolute altitude that blows secondary air channel, liquidate in twos with the wind that forms front chimney arch, rear chimney arch and the left wall of boiler, the right wall of boiler place secondary air channel;
The material of the material of all Secondary Air airducts in the Secondary Air lance system of described upper and lower two-layer dislocation and the shower nozzle of agstone is the refractory concrete castable.
Like this, from a wind of air compartment pass fire grate, coal seam enters in burner hearth, parallel with the volatile matter of separating out from coal seam, before and after relying on, the effect of chimney arch mixes, and promotes the after-flame with coal of lighting of new coal; Local oxygen-rich area and fuel-rich regions are still arranged, and mixability is limited, and the lower floor's Secondary Air arranged at chimney arch aditus laryngis place liquidates in twos, and vertical with the direction of flow of flue gas, effectively strengthen the mixing of flue gas, reduced the discharge of fuel gas and carbon black, reduced unburned carbon in flue dust.
The setting of double-deck dislocation Secondary Air, purpose are the generation discharges that reduces nitrogen oxide.It is imagined substantially, and excess Temperature is avoided in hope and excess air coefficient all is in the situation of higher level at the nitrogen oxide formation zone, thereby reduces the growing amount of nitrogen oxide.Top in primary zone arranges overfire air port, makes the part Secondary Air spray in burner hearth by this spout;
The be inclined upwardly shower nozzle of the agstone that 20 ℃ of angles liquidate, can effectively extend the time that agstone reacts with sulfur dioxide, strengthens desulfurized effect.
Beneficial effect of the present invention
A kind of chain-grate boiler with double-deck wrong row's Secondary Air jet pipe and agstone lance system of the present invention
, due toAdopted double-deck wrong row's Secondary Air jet pipe, thereby strengthened the disturbance of gas in chain-grate boiler, increase the chance that air contacts with the coal volatile matter, built the burning situation of " at high-temperature region richness fuel, at the low-temperature space oxygen enrichment ", thereby reduced generation and the discharge of nitrogen oxide.Simultaneously, at 800 ℃ of region divisions shower nozzle of the agstone liquidated at 20 degree angles obliquely, increased lime stone and sulfur dioxide in flue gas touch opportunity, thereby further reduced the concentration of emission of nitrogen oxide and sulfur dioxide.
The accompanying drawing explanation
The structural representation of Fig. 1, composite secondary air apparatus for chain boiler combustion;
The generalized section of Fig. 2, composite secondary air apparatus for chain boiler combustion;
The front view sectional structure schematic diagram of a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system of Fig. 3, embodiment 1, in figure, 1 is that air compartment, 2 is that fire grate, 3 is that coal seam, 4 is front chimney arch, 51,52 for upper strata, chimney arch place singly liquidate secondary air channel, 61,62 for the shower nozzle of agstone, 7 for upper strata, the side wall place secondary air channel, 81,82 that singly liquidates rushes secondary air channel for side wall lower floor biconjugate, 91,92 for chimney arch place lower floor biconjugate rushes Secondary Air, be responsible for, 10 be rear chimney arch;
The top view structural representation of a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system of Fig. 4, embodiment 1;
The A-A vertical view cutaway drawing of a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system of Fig. 5, embodiment 1.
The specific embodiment
Below by specific embodiment, also by reference to the accompanying drawings the present invention is further set forth, but do not limit the present invention.
A kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system, the cutaway view of its front view as shown in Figure 3, in Fig. 3,1 is air compartment, 2 is fire grate, 3 is coal seam, 4 is front chimney arch, 51, 52 is front chimney arch, upper strata, the rear chimney arch place secondary air channel that singly liquidates, it is its position correspondence, formation liquidates, 61, 62 for being arranged on the boiler front wall, the shower nozzle of the agstone of wall after boiler, 7 are upper strata, the boiler right-side wall place secondary air channel that singly liquidates, 81, 82 rush secondary air channel for boiler right-side wall lower floor biconjugate, 91, 92 is front chimney arch, rear chimney arch place lower floor biconjugate rushes the Secondary Air supervisor, it is its position correspondence, formation liquidates, 10 is rear chimney arch,
The shower nozzle 61,62 of described agstone is separately positioned on fire box temperature left and right, 800 ℃ of zones the 20 ℃ of angles that tilt obliquely;
Above-mentioned a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system, its top view as shown in Figure 4, as can be seen from Figure 4, be respectively the biconjugate that is arranged on the left wall of boiler lower floor and rush secondary air channel 81 ', 82 ', to rush secondary air channel 81,82 positions corresponding with the right wall of boiler lower floor biconjugate respectively in its position, be arranged on the position correspondence of the shower nozzle 61,62 of the agstone of wall after boiler front wall, boiler, formation liquidates;
From Fig. 3, can find out in conjunction with Fig. 4, each 1 list arranged is to blowing on secondary air channel 51,52 and the left wall of boiler, the right wall of boiler each 1 list arranged of correspondence position to blowing secondary air channel 7,7 ' at correspondence position on front chimney arch, rear chimney arch, amount to 4 lists identical to the absolute altitude that blows secondary air channel, with the wind that forms front chimney arch, rear chimney arch and the left wall of boiler, the right wall of boiler place secondary air channel, liquidate in twos, the Secondary Air lance system that namely forms upper and lower two-layer dislocation is the Secondary Air lance system at the middle and upper levels;
Above-mentioned a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system, from the A-A of its front view to the top view of overlooking downwards as shown in Figure 5, in Fig. 5, can find out, front chimney arch, 2 supervisors 91 that arrange in rear chimney arch, 92, on supervisor 91, be provided with arm 911, 912, on supervisor 92, be provided with arm 921, 922, wherein arm 911 is relative with the position of arm 921, arm 921 is relative with the position of arm 922, 2 set supervisors 91, 92 and its upper setting 911, 912, 921, 9224 arms and a boiler left side, 2 biconjugates that arrange respectively on the right wall of boiler rush airduct 81, 82, 81 ', 82 ' amounts to 10 airducts on same absolute altitude, namely form described on, lower floor's Secondary Air lance system in the Secondary Air lance system of lower two-layer dislocation.
When above-mentioned a kind of chain-grate boiler with double-deck wrong row's Secondary Air and agstone lance system carries out work, from the air of blower fan from the left and right side wall respectively from the supervisor 91 of lower floor's Secondary Air, 92 enter front chimney arch, in rear chimney arch, at front chimney arch, in rear chimney arch, carry out assignment of traffic, be assigned to respectively two groups of corresponding arms 911 of supervisor, 912, 921, in 922, air is from arm 911, 912, 921, 922 are ejected in burner hearth, along arm 911, 912, 921, the Secondary Air of 922 ejections liquidates in twos, with the left wall of boiler, the right wall of boiler place lower floor biconjugate rushes secondary air channel 81, 81 ', 82, 82 ' the wind blown out combines, changed this regional flow field, flue gas mixability is vertically upward strengthened, being conducive to this regional flue gas mixes,
Upper strata secondary air channel 51,52 is set simultaneously on front chimney arch, rear chimney arch, with upper strata secondary air channel 7,7 on the left wall of boiler, the right wall of boiler ' because absolute altitude is identical, form singly the liquidate wind of secondary air channel of front chimney arch, rear chimney arch and the left wall of boiler, upper strata, boiler right wall place and liquidate in twos, further strengthened the mixing of the flue gas in should zone and flowed;
Namely form the chain-grate boiler with bilayer dislocation Secondary Air and agstone lance system
.
Application Example 1
Utilize the described a kind of chain-grate boiler with bilayer dislocation Secondary Air and agstone lance system of embodiment 1 to carry out desulphurization denitration, coal seam 3 on traveling-grate stoker 2 from left to right successively through moisture separate out, several processes such as Volatile, volatile combustion, coke burning and after-flame wait, the concentration of emission of final nitrogen oxide is controlled at 400mg/m
3Below, the concentration of emission of sulfur dioxide is controlled at 400mg/m
3Below.
Application comparative examples 1
Adopt chain-grate boiler of the prior art to carry out desulphurization denitration, coal seam 3 on traveling-grate stoker 2 from left to right successively through moisture separate out, several processes such as Volatile, volatile combustion, coke burning and after-flame wait, final discharged nitrous oxides concentration is 700mg/m
3Left and right, sulfur dioxide emissioning concentration are 900mg/m
3Left and right.
And adopt the disclosed a kind of composite secondary air apparatus for chain boiler combustion of CN200820059852 to carry out desulphurization denitration, coal seam 3 on traveling-grate stoker 2 from left to right successively through moisture separate out, several processes such as Volatile, volatile combustion, coke burning and after-flame wait, final discharged nitrous oxides concentration is 525mg/m
3Left and right, sulfur dioxide emissioning concentration are 900mg/m
3Left and right.
Show thus, the disclosed a kind of composite secondary air apparatus for chain boiler combustion of patent CN200820059852 carries out desulphurization denitration, and nitrous oxides concentration has reduced 25%; But sulfur dioxide concentration does not become substantially, is still 900mg/m
3.
And above-mentioned Application Example 1 and the disclosed a kind of composite secondary air apparatus for chain boiler combustion of CN200820059852 are carried out to the nitrogen oxide after desulphurization denitration, sulfur dioxide emissioning concentration contrasts, can find out, a kind of chain-grate boiler with bilayer dislocation Secondary Air and agstone lance system of the present invention has reduced by 24% than the concentration of emission of the nitrogen oxide of the disclosed a kind of composite secondary air apparatus for chain boiler combustion of patent CN200820059852, the concentration of emission of sulfur dioxide has reduced by 56%, shown that thus a kind of chain-grate boiler with bilayer dislocation Secondary Air and agstone lance system of the present invention can significantly reduce generation and the discharge of nitrogen oxide, also significantly reduced simultaneously the discharge of sulfur dioxide.
Above said content is the basic explanation under conceiving for the present invention only, and according to technical scheme of the present invention institute
Any equivalent transformation of doing, all should belong to protection scope of the present invention.
Claims (2)
1. with double-deck mistake, arrange the chain-grate boiler of Secondary Air jet pipe and agstone lance system for one kind, comprise air compartment, fire grate, coal seam, front chimney arch, the shower nozzle of agstone, rear chimney arch, burner hearth, wall after boiler front wall, boiler, the left wall of boiler, the right wall of boiler and Secondary Air lance system;
It is characterized in that described Secondary Air lance system is upper and lower two-layer Secondary Air lance system, arranged in dislocation is at front chimney arch, rear chimney arch, on a boiler left side, boiler right-side wall respectively;
The shower nozzle of described agstone is located at after boiler front wall that fire box temperature is 800 ℃ of zones, boiler relative position on wall, and install at the 20 ℃ of angles that are inclined upwardly;
The Secondary Air lance system of the lower floor in the Secondary Air lance system of described upper and lower two-layer dislocation be included on the left wall of boiler, the right wall of boiler that 2 biconjugates that arrange respectively rush airduct and 1 supervisor arranging respectively in front chimney arch, rear chimney arch and every supervisor on each set arm form;
2 biconjugates that arrange respectively on upper set each arm of 1 supervisor who arranges respectively in front chimney arch, rear chimney arch and every supervisor and the left wall of boiler, the right wall of boiler rush airduct and amount to 10 airducts on same absolute altitude;
The Secondary Air lance system on the upper strata in the Secondary Air lance system of described upper and lower two-layer dislocation, namely be included in each 1 list arranged of correspondence position on front chimney arch, rear chimney arch and to blowing secondary air channel, amount to 4 lists identical to the absolute altitude that blows secondary air channel to blowing each 1 list arranged of correspondence position on the left wall of secondary air channel and boiler, the right wall of boiler.
2. a kind of chain-grate boiler with double-deck wrong row's Secondary Air jet pipe and agstone lance system as claimed in claim 1, is characterized in that the material of the shower nozzle of the material of all airducts in the Secondary Air lance system of described upper and lower two-layer dislocation and agstone is the refractory concrete castable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310347260.1A CN103411206B (en) | 2013-08-12 | 2013-08-12 | Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system |
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|---|---|---|---|
| CN201310347260.1A CN103411206B (en) | 2013-08-12 | 2013-08-12 | Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439791A (en) * | 2016-09-09 | 2017-02-22 | 苏州金洋环保科技有限公司 | Energy saving and emission reducing process for chain grate boiler |
| CN110107884A (en) * | 2019-04-29 | 2019-08-09 | 航天科工哈尔滨风华有限公司电站设备分公司 | A kind of efficiently low NOXBurning zone fires device |
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| EP1188022B1 (en) * | 1999-05-21 | 2010-03-24 | Barlow Projects, Inc. | Improved mass fuel combustion system |
| CN101949534A (en) * | 2010-09-30 | 2011-01-19 | 清华大学 | Biomass grate firing boiler |
| CN202303342U (en) * | 2011-10-26 | 2012-07-04 | 杭州蓝禾新能源工程技术有限公司 | Vacuum boiler for biomass particles |
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| JP3140180B2 (en) * | 1992-06-29 | 2001-03-05 | 株式会社タクマ | boiler |
| EP1188022B1 (en) * | 1999-05-21 | 2010-03-24 | Barlow Projects, Inc. | Improved mass fuel combustion system |
| CN2534468Y (en) * | 2002-04-26 | 2003-02-05 | 卢长柱 | Vortex furnace arch moving gasification stepping burning bed furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439791A (en) * | 2016-09-09 | 2017-02-22 | 苏州金洋环保科技有限公司 | Energy saving and emission reducing process for chain grate boiler |
| CN110107884A (en) * | 2019-04-29 | 2019-08-09 | 航天科工哈尔滨风华有限公司电站设备分公司 | A kind of efficiently low NOXBurning zone fires device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103411206B (en) | 2015-07-22 |
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