CN102798112B - Boiler capable of preventing scorification and dust stratification - Google Patents
Boiler capable of preventing scorification and dust stratification Download PDFInfo
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- CN102798112B CN102798112B CN201210328883.XA CN201210328883A CN102798112B CN 102798112 B CN102798112 B CN 102798112B CN 201210328883 A CN201210328883 A CN 201210328883A CN 102798112 B CN102798112 B CN 102798112B
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- flue
- shock chamber
- boiler
- comer
- import
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- 239000000428 dust Substances 0.000 title claims abstract description 26
- 238000013517 stratification Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 230000035939 shock Effects 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000008676 import Effects 0.000 claims description 24
- 229910052783 alkali metal Inorganic materials 0.000 claims description 12
- 150000001340 alkali metals Chemical class 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000003500 flue dust Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 flue gas alkali metal Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000001883 metal evaporation Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Incineration Of Waste (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a technology for preventing scorification and dust stratification in a boiler, and in particular relates to a boiler capable of preventing scorification and dust stratification. The boiler comprises a hearth and a flue communicated with the hearth, wherein a platen superheater is arranged at the top of the hearth; the flue is internally provided with a convection superheater and a reheater; a low-temperature area is arranged behind the flue in which the convection superheater and the reheater are arranged; a declining pipe is arranged at the bottom of the flue adjoining to the front end of the low-temperature area; a shock chamber is arranged at the lower end of the declining pipe; an outlet at the bottom of the shock chamber is connected to an inlet of a clarifying tank; the inlet of the clarifying tank is connected to an inlet of a filter; the inlet of the filter is connected to an inlet of a secondary heat exchanger; an outlet of the secondary heat exchanger is communicated to an chilling water inlet at the wall of the declining pipe through a plurality of pipelines; and an outlet at the upper end of the side wall of the shock chamber is connected with a tail flue. Water bath dedusting is carried out on the flue gas by using the shock chamber arranged at the tail of the boiler, scorification and dust stratification of a heated surface in the low-temperature area of the boiler are reduced, the heat exchanging efficiency of an heat exchange surface is improved, and the boiler steam rate is stabilized.
Description
Technical field
The present invention relates to the technology preventing pulverized-coal fired boiler slagging scorification dust stratification, particularly a kind of boiler preventing slagging scorification dust stratification.
Background technology
High alkalinity coal, in combustion due to the volatilization of alkali metal, easily forms one deck bottoming attachment in heating surface condensation.Along with attachment is to the suction-operated of flying dust, heating surface can be made to occur contamination in various degree and fouling phenomenon, and soot blower cannot be used to remove, thus increase heat exchange thermal resistance, reduce the heat exchange efficiency of heat-transfer surface, finally make burner hearth exert oneself greatly to reduce and cause blowing out.Dust stratification have impact on the appropriate design layout of heating surface simultaneously, causes exhaust gas temperature to raise.In addition on the one hand, alkali metal can form complex compound with iron phase element, is formed and gnaws the effect of biting, the compressive resistance of metal heated is reduced to metal pipe-wall, causes heat-transfer surface to restrain and booster occurs, the stability that the equipment that has a strong impact on runs and reliability.Dust stratification stains the safe and economical operation that drastically influence boiler in a word.
Pulverized-coal fired boiler dust stratification problem is the ubiquitous phenomenon of current thermal power plant, gently then affects heat transfer, forces boiler load down to run, and reduces the efficiency of boiler; Heavy then cause unplanned blowing out or cause serious accident, be jeopardize the difficult problem that safe and economical boiler runs.Domestic engineering operation experience is also lacked for burning high alkalinity coal, at present only individual power plants in the overbasic utilization of combustion research.Clogging problems is caused for due to alkali metal evaporation, it is a difficult problem of boiler operatiopn always, carried out the time of upper a century to the research of station boiler slagging scorification, the settling mode summed up comprises outer coal to be mixed burning, ignition temperature field optimizing tissue, adds modified material etc.Outer coal mixes burning problem indeed through other low alkalinity metal coals of interpolation, reduces alkali-metal relative amount in raw coal, and the demand of the external coal of which is comparatively large, if raw coal Land use systems is electric power stations near coal-mines, this mode is often subject to the restriction of traffic condition; Ignition temperature field optimizing tissue effectively can avoid the heterogeneity in temperature field, and the clogging problems for high-temperature area can locally solve; Add the restriction that modified material is subject to coal characteristic and cost etc., more difficult large-scale application.Therefore, due to the difficulty of problem itself, never a reasonable mode is treated the direct combustion problem of high sodium coal and is solved, reach directly utilize high sodium coal combustion, object that equipment is in reliable and stable operation.
Summary of the invention
The present invention is for solving existing station boiler low-temperature space slagging scorification fouling phenomenon, provide a kind of boiler preventing slagging scorification dust stratification, by transformation boiler back end ductwork, add shock chamber and alkali metal and flying dust are adsorbed, solve slagging scorification and dust stratification from source.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of boiler preventing slagging scorification dust stratification, comprise burner hearth, the flue be communicated with burner hearth, roof of the furnace is provided with pendant superheater, convection superheater and reheater is provided with in flue, convection superheater and reheater place flue be low-temperature space below, it is characterized in that: the bottom of the flue adjacent with low-temperature space front end is provided with down-comer, down-comer lower end is provided with shock chamber, outlet bottom shock chamber is connected to the import of defecator, the import of defecator is connected to the import of filter, the import of filter is connected to the import of secondary heat exchanger, the outlet of secondary heat exchanger by some pipeline communications to the chilled water import being positioned at down-comer tube wall, the outlet of the sidewall upper of described shock chamber connects back-end ductwork.
Described chilled water import distributes along the even circumferential of down-comer tube wall, after chilled water enters down-comer, slowly flows downward along down-comer inwall, forms water membrane.
Air preheater is provided with in described back-end ductwork.
Water pump is provided with between described defecator and filter.
The outlet of described shock chamber sidewall upper and back-end ductwork Flange joint.
Operation principle of the present invention is as follows:
Flue gas in burner hearth enters flue, with pendant superheater, convection superheater, the abundant heat exchange of reheater, enter alkali metal easily occur condense low-temperature space before, flue gas entered shock chamber through down-comer and carried out water-bath; When carrying out water-bath, because chilled water import even circumferential distributes, chilled water slowly flows downward along down-comer inwall, form water membrane, when flue gas enters shock chamber by down-comer, flue gas is forced to wash fully with chilled water, and the alkali metal of the flying dust in flue gas and easily condensation is removed, form buck, reach the purification object of flue dust; Flue gas after Quench is exported by shock chamber and enters back-end ductwork, carries out heat exchange with air preheater, reduces exhaust gas temperature; Buck bottom shock chamber enters defecator, and in defecator, buck is by after preliminary treatment, to be beaten by buck and purifies buck further toward filter, carrying out flue gas washing, recycling finally by reentering shock chamber after secondary heat exchanger heat exchange from water pump.
Beneficial effect of the present invention is as follows:
(1) utilize in the boiler of high alkalinity coal in burning, adopt shock chamber's water-bath, water bath dust-removing is carried out to flue gas, decreases slagging scorification and the dust stratification of boiler low-temperature district heating surface, improve the heat exchange efficiency of heat-transfer surface, stablize boiler output;
(2) to decrease in flue gas alkali metal to the corrosion of boiler heating surface, improve boiler safety and economy is run;
(3) adopt the sensible heat of chilled water to flue gas to reclaim, process Posterior circle is carried out to chilled water and utilizes, reduce thermal losses as much as possible;
(4) adopt Flange joint, by flue zones of different separately, unlike material can be adopted respectively, thus reduce costs;
(5) modified node method of the present invention is not limited to use high alkalinity coal burning boiler, applicable equally to other pulverized-coal fired boiler slagging scorification dust stratifications.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Wherein, Reference numeral is as follows: 1 burner hearth, 2 pendant superheaters, 3 convection superheaters, 4 reheaters, 5 down-comers, 6 shock chambers, 7 defecators, 8 water pumps, 9 filters, 10 secondary heat exchangers, 11 air preheaters.
Detailed description of the invention
As shown in Figure 1, a kind of boiler preventing slagging scorification dust stratification, comprise burner hearth 1, the flue be communicated with burner hearth 1, burner hearth 1 top is provided with pendant superheater 2, convection superheater 3 and reheater 4 is provided with in flue, convection superheater 3 and reheater 4 place flue be low-temperature space below, the bottom of the flue adjacent with low-temperature space front end is provided with down-comer 5, down-comer 5 lower end is provided with shock chamber 6, outlet bottom shock chamber 6 is connected to the import of defecator 7, the import of defecator 7 is connected to the import of filter 9, the import of filter 9 is connected to the import of secondary heat exchanger 10, the outlet of secondary heat exchanger 10 by some pipeline communications to the chilled water import being positioned at down-comer 5 tube wall, the outlet of the sidewall upper of described shock chamber 6 connects back-end ductwork.
Described chilled water import distributes along the even circumferential of down-comer 5 tube wall, after chilled water enters down-comer 5, slowly flows downward along down-comer 5 inwall, forms water membrane.
Air preheater 11 is provided with in described back-end ductwork.
Water pump 8 is provided with between described defecator 7 and filter 9.
The outlet of described shock chamber 6 sidewall upper and back-end ductwork Flange joint.
Operation principle of the present invention is as follows:
Flue gas in burner hearth 1 enters flue, and with the fully heat exchange of pendant superheater 2, convection superheater 3, reheater 4, entering before the low-temperature space condensed easily occurs alkali metal, flue gas entered shock chamber 6 through down-comer 5 and carries out water-bath; When carrying out water-bath, because chilled water import even circumferential distributes, chilled water slowly flows downward along down-comer 5 inwall, form water membrane, when flue gas enters shock chamber 6 by down-comer 5, flue gas is forced to wash fully with chilled water, and the alkali metal of the flying dust in flue gas and easily condensation is removed, form buck, reach the purification object of flue dust; Flue gas after Quench is exported by shock chamber 6 and enters back-end ductwork, carries out heat exchange with air preheater 11, reduces exhaust gas temperature; Buck bottom shock chamber 6 enters defecator 7, in defecator 7 buck by preliminary treatment after, from water pump 8 buck beaten and purify buck further toward filter 9, carrying out flue gas washing finally by reentering shock chamber 6 after secondary heat exchanger 10 heat exchange, recycling.
Claims (5)
1. one kind prevents the boiler of slagging scorification dust stratification, comprise burner hearth (1), the flue be communicated with burner hearth (1), burner hearth (1) top is provided with pendant superheater (2), convection superheater (3) and reheater (4) is provided with in flue, convection superheater (3) and reheater (4) place flue be low-temperature space below, it is characterized in that: the bottom of the flue adjacent with low-temperature space front end is provided with down-comer (5), down-comer (5) lower end is provided with shock chamber (6), the outlet of bottom, shock chamber (6) is connected to the import of defecator (7), the import of defecator (7) is connected to the import of filter (9), the import of filter (9) is connected to the import of secondary heat exchanger (10), the outlet of secondary heat exchanger (10) by some pipeline communications to the chilled water import being positioned at down-comer (5) tube wall, the outlet of the sidewall upper of described shock chamber (6) connects back-end ductwork, air preheater (11) is provided with in described back-end ductwork.
2. a kind of boiler preventing slagging scorification dust stratification according to claim 1, it is characterized in that: described chilled water import distributes along the even circumferential of down-comer (5) tube wall, after chilled water enters down-comer (5), slowly flow downward along down-comer (5) inwall, form water membrane.
3. a kind of boiler preventing slagging scorification dust stratification according to claim 1, is characterized in that: be provided with water pump (8) between described defecator (7) and filter (9).
4. a kind of boiler preventing slagging scorification dust stratification according to claim 1, is characterized in that: the outlet of described shock chamber (6) sidewall upper and back-end ductwork Flange joint.
5. a kind of boiler preventing slagging scorification dust stratification according to claim 1-4 any one, it is characterized in that its operation principle is: the flue gas in burner hearth (1) enters flue, with pendant superheater (2), convection superheater (3), reheater (4) fully heat exchange, enter alkali metal easily occur condense low-temperature space before, flue gas entered shock chamber (6) through down-comer (5) and carried out water-bath; When carrying out water-bath, because chilled water import even circumferential distributes, chilled water slowly flows downward along down-comer (5) inwall, form water membrane, when flue gas enters shock chamber (6) by down-comer (5), flue gas is forced to wash fully with chilled water, and the alkali metal of the flying dust in flue gas and easily condensation is removed, form buck, reach the purification object of flue dust; Flue gas after Quench is exported by shock chamber (6) and enters back-end ductwork, carries out heat exchange with air preheater (11), reduces exhaust gas temperature; The buck of bottom, shock chamber (6) enters defecator (7), after the middle buck of defecator (7) is by preliminary treatment, from water pump (8) buck beaten and purify buck further toward filter (9), carrying out flue gas washing finally by reentering shock chamber (6) after secondary heat exchanger (10) heat exchange, recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210328883.XA CN102798112B (en) | 2012-09-07 | 2012-09-07 | Boiler capable of preventing scorification and dust stratification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210328883.XA CN102798112B (en) | 2012-09-07 | 2012-09-07 | Boiler capable of preventing scorification and dust stratification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102798112A CN102798112A (en) | 2012-11-28 |
| CN102798112B true CN102798112B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210328883.XA Active CN102798112B (en) | 2012-09-07 | 2012-09-07 | Boiler capable of preventing scorification and dust stratification |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106195996A (en) * | 2016-06-30 | 2016-12-07 | 禹州市神运机械有限公司 | A kind of ossicated circulation boiler furnace apparatus |
| CN108119896A (en) * | 2017-12-18 | 2018-06-05 | 国网新疆电力有限公司电力科学研究院 | It is a kind of to improve accurate eastern coal combustion slagging, the multifuel combustion method of fouling characteristics |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3872836A (en) * | 1973-09-18 | 1975-03-25 | Foster Wheeler Corp | Coal-fired generator of medium to large capacity |
| SU1733844A1 (en) * | 1990-02-14 | 1992-05-15 | Томский политехнический институт им.С.М.Кирова | Boiler |
| CN100429194C (en) * | 2006-09-28 | 2008-10-29 | 南京大学 | Method for utilizing reaction heat in process of producing methane chloride and purifying mixture |
| CN101298569B (en) * | 2008-06-26 | 2011-05-11 | 华东理工大学 | Gasification method of shock chilling type pulp or powder carbonaceous material |
| CN102434357A (en) * | 2011-10-21 | 2012-05-02 | 华北电力大学（保定） | System for generating power employing condensed water of flue gases in supercharged oxygen-enriched coal burning boiler |
| CN202813331U (en) * | 2012-09-07 | 2013-03-20 | 中国东方电气集团有限公司 | Slag-bonding and dust accumulation preventing boiler |
-
2012
- 2012-09-07 CN CN201210328883.XA patent/CN102798112B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3872836A (en) * | 1973-09-18 | 1975-03-25 | Foster Wheeler Corp | Coal-fired generator of medium to large capacity |
| SU1733844A1 (en) * | 1990-02-14 | 1992-05-15 | Томский политехнический институт им.С.М.Кирова | Boiler |
| CN100429194C (en) * | 2006-09-28 | 2008-10-29 | 南京大学 | Method for utilizing reaction heat in process of producing methane chloride and purifying mixture |
| CN101298569B (en) * | 2008-06-26 | 2011-05-11 | 华东理工大学 | Gasification method of shock chilling type pulp or powder carbonaceous material |
| CN102434357A (en) * | 2011-10-21 | 2012-05-02 | 华北电力大学（保定） | System for generating power employing condensed water of flue gases in supercharged oxygen-enriched coal burning boiler |
| CN202813331U (en) * | 2012-09-07 | 2013-03-20 | 中国东方电气集团有限公司 | Slag-bonding and dust accumulation preventing boiler |
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| Publication number | Publication date |
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| CN102798112A (en) | 2012-11-28 |
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Effective date of registration: 20180426 Address after: 610000 18 West core road, hi-tech West District, Chengdu, Sichuan Patentee after: Dongfang Electric Co., Ltd. Address before: 610036 Shu Han Road, Jinniu District, Chengdu, Sichuan Province, No. 333 Patentee before: Dongfang Electric Corporation |