CN103939923A - Strong-directionality supersonic-speed steam flow steam soot blower system - Google Patents
Strong-directionality supersonic-speed steam flow steam soot blower system Download PDFInfo
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- CN103939923A CN103939923A CN201410210177.4A CN201410210177A CN103939923A CN 103939923 A CN103939923 A CN 103939923A CN 201410210177 A CN201410210177 A CN 201410210177A CN 103939923 A CN103939923 A CN 103939923A
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Abstract
The invention provides a strong-directionality supersonic-speed steam flow steam soot blower system, and relates to an efficient cleaning system which is applied to a high-temperature convection heating surface and a half-radiation heating surface of a power station burning Zhundong coal pi-shaped boiler, wherein steam serves as a working medium of the efficient cleaning system. The strong-directionality supersonic-speed steam flow steam soot blower system comprises a low-temperature reheater outlet header steam guide pipe, a soot blowing steam source branch side main stop valve, a soot blowing steam source branch side steam distribution header, a screen type superheater soot blowing and steam distribution header steam inlet valve, a high-temperature superheater soot blowing and steam distribution header steam inlet valve, a high-temperature reheater soot blowing and steam distribution header steam inlet valve, a screen type superheater soot blowing and steam distribution header, a high-temperature superheater soot blowing and steam distribution header, a high-temperature reheater soot blowing and steam distribution header, soot blower set star/stop valves, soot blower set steam supply small headers, supersonic-speed steam flow spray nozzles, supersonic-speed steam flow spray nozzle positioning cleadings, roof tubes, roof tube fins, a distributed control system and connecting pipelines. Outlets of the supersonic-speed steam flow spray nozzles are shaped like narrow and long squares provided with fillets, are easily arranged between a roof superheater and a side enclosure wall superheater, and are closely attached to a heating surface which needs soot removal. A large number of supersonic-speed steam flow spray nozzles can be arranged as needed, and therefore the soot removal capacity of the strong-directionality supersonic-speed steam flow steam soot blower system is far better than that of a long-stroke steam soot blower in the prior art.
Description
(1) technical field:
The present invention points to by force supersonic speed steam flow Steam Soot-Blower System and relates to a kind of high temperature convection heating surface and half radiation heating-surface that uses accurate eastern coal Π shape boiler for power station, adopts the high-efficiency cleaning system that steam is working medium.
(2) background technology:
Since there being station boiler just to have steam sootblower, its structure last 100 years does not have large variation.
Prior art comprises for the Steam Soot-Blower System of high temperature convection heating surface and half radiation heating-surface: total shut-off valve, steam pressure-reducing station, connecting pipe, manual maintenance isolating valve, drain valve, long stroke steam sootblower, PLC (Programmable Logic Controller); The vapour source of typical long stroke steam sootblower is taken from superheater and is divided shield outlet (19.3MPa563 DEG C), 3.0MPa493 DEG C after the decompression of steam pressure-reducing station; The inner tube of long stroke steam sootblower is fixed, post-decompression steam enters inner tube through manual maintenance with the inlet valve that isolating valve and long stroke steam sootblower carry, moving cooperation of the inner surface of ash gun pipe and the outer surface of inner tube scalable, rotation, the tightness between annular gland packing box maintenance inner tube and ash gun pipe; The end of ash gun pipe is provided with 1 or 2 radial nozzles; The design steam flow of long stroke steam sootblower is generally 60kg/min to 120kg/min; Ash gun pipe is driven and is sent in stove by electrically driven treadmill, and inlet valve is opened, and blows ash and starts, and advances and arrive counter motion after extreme position in ash gun tube edge rotation limit; Under PLC controls, long stroke steam sootblower can continue back and forth operation, the reciprocal time that also can work and specify for a long time; Long stroke steam sootblower is usually placed between each group of heating surface, provides a kind of probability to blow grey function to being arranged in its forward and backward heating surface.
The station boiler of prior art burns accurate eastern coal 40% when above mixing, and occurs that the slagging scorification of hearth combustor region is serious; Pendant superheater, high temperature superheater, the contamination of high temperature reheater cigarette side, dust stratification, obstruction are serious; Exhaust gas temperature raises, degradation phenomenon under on-load ability.As expected, 100% uses accurate eastern coal, and the common way of prior art is the long stroke steam sootblower of configuration to be doubled and operation continuously, yet do not have station boiler 100% use accurate eastern coal for a long time, the record of safe operation.
(3) summary of the invention:
Technical problem to be solved:
The operating pressure of the long stroke steam sootblower of prior art can not be too low, and pressure is low not only blows that grey ability declines but also ash gun pipe amount of deflection increases, and may can not contract, and burns out ash gun pipe; Operating pressure can not be too high, the too high tightness that is difficult to ensure ring packing stuffing-box; Ash gun pipe meeting in service attenuate gradually, the too high ash gun pipe of operating pressure working life also shortens; The long stroke steam sootblower of prior art must configure steam pressure-reducing station operating pressure is fluctuateed among a small circle for this reason.
The decompression process of steam in pressure-reducing station, sees it is a constant enthalpy entropy increasing process from thermodynamics, make steam in nozzle by pressure energy be converted to speed can ability greatly decline, blow grey usefulness also significantly decline.
The long stroke steam sootblower complex structure of prior art, maintenance workload is large, and maintenance cost is high, and cost is high; Stove needs roomy installation, operation, maintenance platform to coordinate outward; 1 of the end of ash gun pipe or 2 radial nozzles are due to structural restriction, and nozzle efficiency is low; Due to structural limitation, the long stroke steam sootblower of prior art is difficult to manufacture the product that is greater than 120kg/min.
For above-mentioned reasons, expect that energy 100% uses the boiler of accurate eastern coal, the long stroke steam sootblower of configuration doubles, can arrange that the side wall of long stroke steam sootblower piled, be also the not sure clean conditions of long period maintenance pendant superheater, high temperature superheater, high temperature reheater of the continuous operation of soot blower.
Solve the technical scheme that its technical problem adopts:
The object that the present invention points to by force supersonic speed steam flow Steam Soot-Blower System is to provide a kind of high temperature convection heating surface and half radiation heating-surface that uses accurate eastern coal Π shape boiler for power station, adopts the high-efficiency cleaning system that steam is working medium.Take technology path unlike the prior art, the long stroke steam sootblower energy consumption that solves prior art is high, and deashing usefulness is low, particularly uses the problem that can not keep for a long time convection heating surface and half radiation heating-surface cleaning on accurate eastern coal utility boiler 100%.
The present invention points to by force supersonic speed steam flow Steam Soot-Blower System and comprises low-temperature reheater outlet header steam guiding tube (1), blow the total stop valve of grey vapour source point side (2), blow a grey vapour source point side and join vapour header (3), pendant superheater blows ash and joins vapour header inlet valve (4), high temperature superheater blows ash and joins vapour header inlet valve (5), high temperature reheater blows ash and joins vapour header inlet valve (6), pendant superheater blows ash and joins vapour header (7), high temperature superheater blows ash and joins vapour header (8), high temperature reheater blows ash and joins vapour header (9), soot blower group start and stop valves (10), the little header of soot blower group steam supply (11), supersonic speed steam flow nozzle (12), supersonic speed steam flow nozzle location cage plate (13), roof tube (14), roof tube fin (15), dcs, connecting pipe, supersonic speed steam flow nozzle (12) is the good convergent-divergent shape nozzle of aerodynamic properties, import circle has set in nozzle cushion cap, throat is converted into the long narrow rectangle with fillet, reach local velocity of sound at throat's steam flow, continue raising speed at divergent segment steam flow and reach hypersonic speed, Outlet Section is the long narrow rectangle with fillet, is easy to be arranged between steam/side enclosure wall superheater pipe, 2 to 6 supersonic speed steam flow nozzles (12) parallel connection is supersonic speed steam flow nozzle sets, by the little header of soot blower group steam supply (11) steam supply, each soot blower group start and stop valves (10) are subject to the control of dcs, control lasting blowing time and the interval time of each group of supersonic speed steam flow nozzle, can compensate to a certain extent the thermal deviation of heating surface, improve the safety in operation of station boiler, the once lasting blowing time of each group supersonic speed steam flow nozzle is 30s to 120s, and 2 times blowing time is spaced apart 1h to 24h, blow grey vapour source and take from low-temperature reheater outlet header steam guiding tube (1), this place's steam enthalpy is higher, and moderate pressure has higher isentropic enthalpy drop, and it is more even on the impact of mass flow in the heating surface tube of low-temperature reheater that vapour is got at this place.
The beneficial effect of the invention:
The accurate eastern coal high temperature convection heating surface of boilers of power plants of solution prior art and half radiation heating-surface contamination, dust stratification, the serious problem of obstruction, provide a kind of high-efficiency cleaning system taking steam as working medium;
Supersonic speed steam flow nozzle has high nozzle velocity coefficient, more effectively the pressure energy of steam is converted to speed energy;
Without steam pressure-reducing station without entropy increasing process, supersonic speed steam flow nozzle can obtain higher usable enthalpy drop, supersonic speed steam flow jet expansion flow velocity can exceed 1200m/s, and the kinetic energy that same quality steam has is than the high order of magnitude of the long stroke steam sootblower of prior art;
Supersonic speed steam flow jet expansion is to be easily arranged between steam and side enclosure wall superheater pipe with the long narrow rectangle of fillet, press close to need the heating surface of deashing, can arrange on demand a large amount of supersonic speed steam flow nozzles, there is the deashing ability of the long stroke steam sootblower that far exceedes prior art;
Supersonic speed steam flow nozzle has highly directive, is arranged in supersonic speed steam flow nozzle sets on boiler ceiling and is particularly suitable for getting through the dust stratification of bridging type between heating surface;
Can design on demand large flow supersonic speed steam flow nozzle, there is no technical difficulty;
Supersonic speed steam flow nozzle movement-less part, manufacturing cost, operating cost, maintenance cost are lower than the long stroke steam sootblower of prior art;
Supersonic speed steam flow nozzle can be divided into 8 to 24 groups on demand along stove is wide, when each component, drop into, controlled by DCS (dcs), control lasting blowing time and the interval time of each group of supersonic speed steam flow nozzle, can compensate to a certain extent the thermal deviation of heating surface, improve the safety in operation of station boiler;
The once lasting blowing time of each group supersonic speed steam flow nozzle is 30s to 120s, and 2 times blowing time is spaced apart 1h to 24h, and its energy consumption is less than the long stroke steam sootblower of the prior art of continuous operation;
Steam conveying pipe is shorter, and absolute altitude changes little, has from hydrophobic ability, respectively organizes supersonic speed steam flow nozzle and starts front without hydrophobic program;
Unit load is higher, and the deashing ability that points to by force supersonic speed steam flow Steam Soot-Blower System is stronger, is conducive to the heavy-duty service of unit long period;
Strong sensing supersonic speed steam flow Steam Soot-Blower System also can be for using common bituminous coal, meager coal, brown coal, anthracitic station boiler, not only there is manufacturing cost, operating cost, advantage that maintenance cost is low compared with the long stroke steam sootblower of prior art, and can compensate to a certain extent the thermal deviation of heating surface, improve the safety in operation of station boiler.
(4) brief description of the drawings:
Fig. 1 is the strong supersonic speed steam flow Steam Soot-Blower System steam-supplying system figure that points to.
Fig. 2 is the location and installation figure of supersonic speed steam flow nozzle on roof tube.
In Fig. 1 and Fig. 2:
1 low-temperature reheater outlet header steam guiding tube, 2 blow the total stop valve of grey vapour source point side,
3 blow a grey vapour source point side join vapour header, 4 pendant superheaters blow ash join vapour header inlet valve,
5 high temperature superheaters blow ash join vapour header inlet valve, 6 high temperature reheaters blow ash join vapour header inlet valve,
7 pendant superheaters blow ash join vapour header, 8 high temperature superheaters blow ash join vapour header,
9 high temperature reheaters blow ash join vapour header, 10 soot blower group start and stop valves,
The little header of 11 soot blower group steam supply, 12 supersonic speed steam flow nozzles,
13 supersonic speed steam flow nozzles location cage plates, 14 roof tubes,
15 roof tube fins.
(5) detailed description of the invention:
Now in conjunction with Fig. 1 with a 600MW grade, the single reheat Π type ultra supercritical station boiler that uses 605 DEG C/623 DEG C of the main stripping temperature/reheat steam temperature of accurate eastern coal degree is that example explanation realizes optimal way of the present invention.
The present invention points to by force supersonic speed steam flow Steam Soot-Blower System and comprises low-temperature reheater outlet header steam guiding tube (1), blow the total stop valve of grey vapour source point side (2), blow a grey vapour source point side and join vapour header (3), pendant superheater blows ash and joins vapour header inlet valve (4), high temperature superheater blows ash and joins vapour header inlet valve (5), high temperature reheater blows ash and joins vapour header inlet valve (6), pendant superheater blows ash and joins vapour header (7), high temperature superheater blows ash and joins vapour header (8), high temperature reheater blows ash and joins vapour header (9), soot blower group start and stop valves (10), the little header of soot blower group steam supply (11), supersonic speed steam flow nozzle (12), supersonic speed steam flow nozzle location cage plate (13), roof tube (14), roof tube fin (15), dcs, connecting pipe, supersonic speed steam flow nozzle (12) is the good convergent-divergent shape nozzle of aerodynamic properties, import circle has set in nozzle cushion cap, throat is converted into the long narrow rectangle with fillet, reach local velocity of sound at throat's steam flow, continue raising speed at divergent segment steam flow and reach hypersonic speed, Outlet Section is the long narrow rectangle with fillet, is easy to be arranged between steam/side enclosure wall superheater pipe, 2 to 6 supersonic speed steam flow nozzles (12) parallel connection is supersonic speed steam flow nozzle sets, by the little header of soot blower group steam supply (11) steam supply, each soot blower group start and stop valves (10) are subject to the control of dcs, control lasting blowing time and the interval time of each group of supersonic speed steam flow nozzle, can compensate to a certain extent the thermal deviation of heating surface, improve the safety in operation of station boiler, the once lasting blowing time of each group supersonic speed steam flow nozzle is 30s to 120s, and 2 times blowing time is spaced apart 1h to 24h, blow grey vapour source and take from low-temperature reheater outlet header steam guiding tube (1), this place's steam enthalpy is higher, and moderate pressure has higher isentropic enthalpy drop, and it is more even on the impact of mass flow in the heating surface tube of low-temperature reheater that vapour is got at this place.
Low-temperature reheater outlet header steam guiding tube (1) get steam ports upwards, tube connector upwards passes after the large bag of furnace roof and arranges and blow the total stop valve of grey vapour source point side (2); Low-temperature reheater outlet header steam guiding tube (1) is divided into A, B both sides, and Fig. 1 only draws a side wherein.
Pendant superheater blows ash and joins vapour header (7), high temperature superheater and blow ash and join vapour header (8), high temperature reheater and blow the half that ash is joined the length of vapour header (9) and be respectively furnace width, each header is divided into A, B both sides, and Fig. 1 only draws a side wherein.
Soot blower group start and stop valves (10) are quick electric metal seal ball valve, 580 DEG C of maximum operating temperatures, be arranged on the large bag of furnace roof along stove is wide, every stove arranges totally 45, soot blower group start and stop valves (10), be divided into 3 row, wherein pendant superheater row arrange 15, and high temperature superheater row arrange 17, and high temperature reheater row arrange 13.
Supersonic speed steam flow nozzle (12) is hot investment casting product, material is martensitic stain less steel 1Cr13, design discharge 120kg/min (only single), every stove arranges totally 180, supersonic speed steam flow nozzle (12), all be arranged in ceiling, wherein pendant superheater position arranges 60, and high temperature superheater position arranges 68, and high temperature reheater position arranges 52.
Supersonic speed steam flow nozzle is located cage plate (13) for fixing supersonic speed steam flow nozzle (12), the dynamical reaction while being enough to bear supersonic speed steam flow nozzle (12) work and the thrust of connecting pipe thermal expansion, and material is 12Cr1MoV.
Connecting pipe material is 12Cr1MoV, total system is to blow the total stop valve of grey vapour source point side (2) as peak, connecting pipe after and before the valve has 5% downward hydraulic gradient at least, the flexibility that connecting pipe is necessary, is enough to the connecting pipe thermal deformation producing while absorbing soot blower group start and stop valves (10) start and stop.
Claims (6)
1. one kind strong is pointed to supersonic speed steam flow Steam Soot-Blower System, it is characterized in that: comprise low-temperature reheater outlet header steam guiding tube (1), blow the total stop valve of grey vapour source point side (2), blow a grey vapour source point side and join vapour header (3), pendant superheater blows ash and joins vapour header inlet valve (4), high temperature superheater blows ash and joins vapour header inlet valve (5), high temperature reheater blows ash and joins vapour header inlet valve (6), pendant superheater blows ash and joins vapour header (7), high temperature superheater blows ash and joins vapour header (8), high temperature reheater blows ash and joins vapour header (9), soot blower group start and stop valves (10), the little header of soot blower group steam supply (11), supersonic speed steam flow nozzle (12), supersonic speed steam flow nozzle location cage plate (13), roof tube (14), roof tube fin (15), dcs, connecting pipe, supersonic speed steam flow nozzle (12) is the good convergent-divergent shape nozzle of aerodynamic properties, import circle has set in nozzle cushion cap, throat is converted into the long narrow rectangle with fillet, reach local velocity of sound at throat's steam flow, continue raising speed at divergent segment steam flow and reach hypersonic speed, Outlet Section is the long narrow rectangle with fillet, is easy to be arranged between steam/side enclosure wall superheater pipe, 2 to 6 supersonic speed steam flow nozzles (12) parallel connection is supersonic speed steam flow nozzle sets, by the little header of soot blower group steam supply (11) steam supply, each soot blower group start and stop valves (10) are subject to the control of dcs, control lasting blowing time and the interval time of each group of supersonic speed steam flow nozzle, can compensate to a certain extent the thermal deviation of heating surface, improve the safety in operation of station boiler, the once lasting blowing time of each group supersonic speed steam flow nozzle is 30s to 120s, and 2 times blowing time is spaced apart 1h to 24h, blow grey vapour source and take from low-temperature reheater outlet header steam guiding tube (1), this place's steam enthalpy is higher, and moderate pressure has higher isentropic enthalpy drop, and it is more even on the impact of mass flow in the heating surface tube of low-temperature reheater that vapour is got at this place.
2. one according to claim 1 is pointed to by force supersonic speed steam flow Steam Soot-Blower System, what it is characterized in that described low-temperature reheater outlet header steam guiding tube (1) gets steam ports upwards, and tube connector upwards passes after the large bag of furnace roof and arranges and blow the total stop valve of grey vapour source point side (2); Low-temperature reheater outlet header steam guiding tube (1) is divided into A, B both sides.
3. one according to claim 1 is pointed to by force supersonic speed steam flow Steam Soot-Blower System, it is characterized in that described pendant superheater blows ash and joins vapour header (7), high temperature superheater and blow ash and join vapour header (8), high temperature reheater and blow the half that ash is joined the length of vapour header (9) and be respectively furnace width, each header is divided into A, B both sides.
4. one according to claim 1 is pointed to by force supersonic speed steam flow Steam Soot-Blower System, it is characterized in that described soot blower group start and stop valves (10) are quick electric metal seal ball valve, 580 DEG C of maximum operating temperatures, are arranged on the large bag of furnace roof along stove is wide.
5. one according to claim 1 is pointed to by force supersonic speed steam flow Steam Soot-Blower System, it is characterized in that described supersonic speed steam flow nozzle (12) is hot investment casting product, and material is martensitic stain less steel 1Cr13.
6. one according to claim 1 is pointed to by force supersonic speed steam flow Steam Soot-Blower System, it is characterized in that described connecting pipe material is 12Cr1MoV, total system is to blow the total stop valve of grey vapour source point side (2) as peak, connecting pipe after and before the valve has 5% downward hydraulic gradient at least, the flexibility that connecting pipe is necessary, is enough to the connecting pipe thermal deformation producing while absorbing soot blower group start and stop valves (10) start and stop.
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| CN201410210177.4A CN103939923B (en) | 2014-05-19 | 2014-05-19 | Strong sensing supersonic speed steam flow Steam Soot-Blower System |
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| CN201410210177.4A CN103939923B (en) | 2014-05-19 | 2014-05-19 | Strong sensing supersonic speed steam flow Steam Soot-Blower System |
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| CN103939923B CN103939923B (en) | 2016-06-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104673399A (en) * | 2015-02-04 | 2015-06-03 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for blowing ash in entrained flow gasifier |
| CN112393263A (en) * | 2020-09-03 | 2021-02-23 | 上海克莱德贝尔格曼机械有限公司 | Soot blowing system and soot blowing method for improving blockage of air preheater |
| WO2022141015A1 (en) * | 2020-12-29 | 2022-07-07 | 苏州西热节能环保技术有限公司 | Steam soot blowing apparatus, rotary air preheater, and steam jet parameter design method |
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| WO2022141015A1 (en) * | 2020-12-29 | 2022-07-07 | 苏州西热节能环保技术有限公司 | Steam soot blowing apparatus, rotary air preheater, and steam jet parameter design method |
| US11885492B2 (en) | 2020-12-29 | 2024-01-30 | Suzhou Tpri Ener & Enviro Tech Co., Ltd. | Steam soot blowing device, rotary air preheater and steam jet parameter design method |
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