CN102889570A - Tower-type boiler with primary reheater and secondary reheater - Google Patents
Tower-type boiler with primary reheater and secondary reheater Download PDFInfo
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- CN102889570A CN102889570A CN201210335374XA CN201210335374A CN102889570A CN 102889570 A CN102889570 A CN 102889570A CN 201210335374X A CN201210335374X A CN 201210335374XA CN 201210335374 A CN201210335374 A CN 201210335374A CN 102889570 A CN102889570 A CN 102889570A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
- F22G1/04—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler by diverting flow or hot flue gases to separate superheaters operating in reheating cycle, e.g. for reheating steam between a high-pressure turbine stage and an intermediate turbine stage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/001—Controlling by flue gas dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
Abstract
The invention discloses a tower-type boiler with a primary reheater and a secondary reheater. A superheater of the boiler comprises a low-temperature superheater and a high-temperature superheater; a technological process of a main steam system comprises the following steps that: feeding water enters a front flue coal economizer and a rear flue coal economizer which are arranged in parallel; water from outlets of the coal economizers enters water-cooling walls from the lower part of a hearth; outlets of the water-cooling walls are connected with a separator; and steam of an outlet of the separator enters the low-temperature superheater and the high-temperature superheater sequentially. According to a low-to-high flow direction of temperatures on a steam side, the primary reheater sequentially comprises primary reheating low-temperature reheaters and a primary reheating high-temperature reheater, the secondary reheater sequentially comprises secondary reheating low-temperature reheaters and a secondary reheating high-temperature reheater, and the primary reheater and the secondary reheater are connected with each other in parallel in a perpendicular flue.
Description
Technical field
The present invention relates to a kind of boiler that twice reheater arranged for power industry.
Background technology
In the power plant, steam becomes relatively low pressure after doing work in steam turbine high-pressure cylinder, discharged by high pressure cylinder, enter in the boiler single reheat device and heat, and discharge after supplying with the acting of steam turbine single reheat intermediate pressure cylinder, enter in the boiler secondary reheater and heat, and supply with steam turbine double reheat intermediate pressure cylinder and low pressure (LP) cylinder acting.This have twice again the thermodynamic cycle of heat have higher efficient than the thermodynamic cycle of single reheat.Above-mentioned boiler with double reheat is used for the power plant.
The efficiency of thermal cycle influence factor is mainly contained for the steam pressure, vapor (steam) temperature and the reheating stage number that do work.The vapor (steam) temperature of current single reheat unit is generally at 600 ℃.And existing double reheat unit superheater and reheater temperature are generally lower, not above 580 ℃.In order further to improve efficiency of thermal cycle, the present invention proposes overheating steam temperature and reheat steam temperature and reaches double reheat boiler more than 600 ℃.
Usually the heat absorption ratio of single reheat boiler superheater and reheater is about 80:20.Reheater heat absorption ratio is less, and only once hotter outlet temperature reach more than 600 ℃, usually reheater is arranged in the cigarette temperature area in 1000 ℃ to 800 ℃ zone, adopt heat convection.And the heat absorption ratio of double reheat boiler superheater of the present invention and single reheat device and secondary reheater is about 71:17:12.Reheater heat absorption large percentage, and have twice hotter outlet temperature reach more than 600 ℃ owing to conduct heat enough heat transfer temperature differences need to be arranged, otherwise need to arrange a large amount of heat exchange areas, not only raise the cost, and in the confined space, be difficult to arrange, increase boiler size.Therefore how to arrange that three vapor (steam) temperatures that comprise superheater, single reheat device, secondary reheater all reach 600 ℃ heating surface, become a difficult point of high parameter double reheat boiler design.
In addition, a kind of can the meeting the demands in the means such as tilting burner, adjusting gas baffle generally adopted in the adjusting of single reheat steam temperature.Because have twice reheater, steam temperature how to regulate twice reheater is the another one difficult point.
The ultra-supercritical boiler of indication of the present invention or super critical boiler refer to the pressure of working medium in the boiler.Working medium in the boiler all is water, and the critical pressure of water is: 22.115MPa, 374 ℃; When this pressure and temperature, the density of water and steam is identical, just cry the critical point of water, the interior power pressure of stove is lower than this pressure and just is subcritical boiler, be exactly super critical boiler greater than this pressure, vapor (steam) temperature is not less than 593 ℃ or steam pressure and is not less than 31 MPa and is called as ultra supercritical in the stove, and ultra supercritical also belongs to subcritical range.
Background technology document of the present invention has the applicant in the denomination of invention of application on April 7th, 2011 to be: a kind of flue is cut apart and the adjustable tower boiler of flow, and application number is 201110085966.6.; It is 350MW supercritical tower-type boiler using brown coal in the denomination of invention of application on December 21st, 2011 that other applicants are arranged in addition, and application number is 201110432324.9.
Summary of the invention
The purpose of this invention is to provide a kind of boiler with twice reheater, the outlet temperature of its superheater, single reheat device, secondary reheater can both reach in 600 ℃ of-695 ℃ of scopes, according to requirement of engineering, preferred 610 ℃-620 ℃ and 630 ℃-650 ℃ of temperature.
In order to realize purpose of the present invention, technical scheme of the present invention is:
A kind of tower boiler with twice reheater, boiler are super critical boiler, and the heating surface of boiler comprises superheater, single reheat device, secondary reheater; Superheater comprises low temperature superheater, high temperature superheater;
Main vapour system flow is: feedwater enters forward and backward flue economizer, front and back flue economizer is for being arranged in parallel, economizer exit water enters water-cooling wall by lower furnace portion, the water-cooling wall outlet connects separator, separator outlet steam enters in low temperature superheater and the high temperature superheater successively, finally enters the steam turbine acting;
The steam of single reheat device flows to from the steam side temperature from low to high from the steam turbine steam discharge, and the single reheat device comprises single reheat low-temperature reheater, single reheat high temperature reheater successively; This steam enters in the steam turbine and does work at last;
The steam of single reheat device namely becomes the steam discharge of steam turbine after the steam turbine acting; The steam of secondary reheater flows to from the steam side temperature from low to high from the steam discharge of this steam turbine, comprises double reheat low-temperature reheater, double reheat high temperature reheater; This steam enters the steam turbine acting at last;
Single reheat device and secondary reheater are arranged in parallel in the burner hearth vertical gas pass.
Preferably, the single reheat high temperature reheater is divided into cold section and hot arc, and the double reheat high temperature reheater is divided into cold section and hot arc;
Low temperature superheater comprises low temperature superheater suspention inlet tube from steam flow, low temperature superheater vertical section heating surface and low temperature superheater screen pipeline section;
First and second colder section of hot high temperature reheater arrange in advance, namely be placed on the high temperature superheater arranged beneath, be in the strong zone of radiation characteristic, the absorption portion radiant heat, first and second hotter high temperature reheater hot arc be placed on the high temperature superheater top and arrange;
The upper furnace vertical gas pass has low temperature superheater screen pipeline section along flue gas flow direction successively arranged in series, first and second cold section of hot high temperature reheater again, high temperature superheater, first and second hot high temperature reheater hot arc again, first and second hot low-temperature reheater again, economizer and low temperature superheater suspention inlet tube; Cold section of cold section of single reheat device and secondary reheater are arranged in parallel, and single reheat device hot arc and secondary reheater hot arc are arranged in parallel, and single reheat low-temperature reheater and double reheat low-temperature reheater are arranged in parallel.
Preferably, low temperature superheater screen pipeline section, the distance between screen and the screen is larger, can see through heat radiation; Low temperature superheater vertical section heating surface also can be suspended on the economizer, reheater, high temperature superheater of low temperature superheater screen pipeline section top;
First and second colder section of hot high temperature reheater be designed to shield tubular type, the screen that part is arranged in low temperature superheater with shield between the top at neutral place, can accept heat radiation;
First and second colder section of hot high temperature reheater also comprise the vertical section heating surface, connect by the vertical section heating surface that is arranged in the vertical gas pass between cold section and the hot arc.
Preferably, smoke gas flow crosses first and second again behind the hot high temperature reheater hot arc, exhaust gases passes is separated mid-feather and is divided into forward and backward flue, and front flue is furnished with single reheat low-temperature reheater and front flue economizer, and rear pass is furnished with double reheat cold reheat and rear pass economizer; Separate mid-feather and extend to the second flue entrance place, and gas baffle is set herein for flue gas flow before and after regulating;
Separate mid-feather and be made of the column pipe membrane wall, this column pipe membrane wall is drawn from low temperature superheater import header as the part of low temperature superheater, gets back to the low temperature superheater outlet header or gets back to middle mixing header;
The single reheat device is near front wall collocation, and secondary reheater is put near rear wall paper.
Preferably, superheater, single reheat device and secondary reheater outlet steam temperature reach 600 ℃ to 695 ℃;
The heat absorption percentage of double reheat boiler superheater and single reheat device and secondary reheater is, the superheater caloric receptivity is 65%-75%, and single reheat device caloric receptivity is 15%-25%, and the secondary reheater caloric receptivity is 10%-15%, and three's sum is 100%.
Preferably, the steam pressure in the superheater is 28MPa-35MPa; Steam pressure in the single reheat device is 5MPa-14MPa;
Steam pressure in the secondary reheater is 2MPa-5MPa.
Preferably, burner hearth is comprised of fin panel casing, and the bottom water-cooling wall adopts helix tube; The top water-cooling wall adopts the arrangement of vertical tube;
Feedwater enters after the forward and backward flue economizer, then enters successively the lower furnace portion spiral and centers on pipeloop, enters middle mixing header, the vertical tube panel of upper furnace, separator, low temperature superheater and high temperature superheater, and last steam enters the acting of steam turbine high pressure cylinder.
Preferably, the superheater steam temperature sprays water to control by coal-water ratio adjusting and two-stage; First and second reheater steam temperature adopts burner swing to regulate synchronously, regulates the balance of absorbing heat between first and second reheater by gas baffle; The trace water spray is set on the low-temperature reheater outlet connecting pipe road.
Therefore, the present invention places part reheater heating surface near burner hearth flue partly, so as to the radiations heat energy of absorption portion burner hearth, thereby reaches the purpose that obtains enough temperature rises with less area.Guarantee when simultaneously, reheater has the radiation heating-surface characteristic to load reduction that reheater export amount fixed temperature is also helpful.
Because radiations heat energy has very large decline after passing heating surface.For making twice outlet temperature can both the absorption portion radiant heat at the reheater more than 600 ℃, and guarantee to obtain higher heat transfer temperature difference.The present invention does not adopt the series connection form of common employing, and adopts the mode that twice reheater is arranged in parallel.
The difference of this double reheat scheme and conventional single reheat scheme is exactly to have increased by one tunnel steam that requires to reach more than 600 ℃, general in other words, it is constant that boiler combustion produces flue-gas temperature, want the heating surface of many high temperature to absorb heat, how to arrange? because conduct heat a fixed difference difference to be arranged, the heating surface that two outlet temperatures reach 600 ℃ is put in general continuous series connection, thereafter flue-gas temperature just is not enough to the 3rd heating surface has been heated to 600 ℃, so the present invention has adopted scheme in parallel, allow two heating surfaces share higher cigarette temperature.The purpose one that reheater partly shifts to an earlier date is in order to improve heat transfer efficiency, the 2nd, and for these temperature adjustment means of tilting burner have higher sensitivity.But in advance reheater neither simply shift to an earlier date just passable, but risky.In the range of choice of present conventional ultra supercritical common used material, for guaranteeing security, the vapor (steam) temperature of the reheater of raying heat can not be too high, otherwise tube wall temperature can be very high, causes not having selectable material.As for the more forward safety issue that but do not exist of low temperature superheater, this is because the pressure ratio reheater of superheater is much higher, the steam heat-transfer character is better, the characteristic of steam has determined under the same vapor (steam) temperature, the metal pipe-wall temperature of reheater is higher than superheater, so reheater can not blindly shift to an earlier date.And present high parameter double reheat scheme will accurately be calculated heating surface to arrange, not only satisfy to reach temperature but also reach safe and reliable.
The temperature regulation characteristic of reheater is regulated excess air coefficient and gas baffle and is regulated in conjunction with finishing by tilting burner.Swing by burner makes in the burner hearth flame kernel raise or reduce, and therefore the reheater outlet temperature with radiation characteristic can raise or reduce.Because twice reheater is arranged in parallel, and is in same cigarette temperature area, so their variation tendency is identical.Increase excess air coefficient the flue gas flow rate by heating surface is increased, also have the effect that improves the reheater heat exchange.The top flue is divided into former and later two flues by column pipe membrane wall midfeather, be furnished with respectively the low-temperature zone of single reheat device and the low-temperature zone of secondary reheater in two flues, this column pipe membrane wall is as the part of low temperature superheater, draw from low temperature superheater import header, get back to the low temperature superheater outlet header or get back to middle mixing header.Midfeather extends to the back-end ductwork porch always, and two flue gas flow controllable registers are set herein.Its purpose is to control by the aperture of controllable register the flue gas flow of former and later two flues, to reach the purpose of regulating the steam temperature rise of first and second low-temperature reheater in former and later two flues.The temperature rise of single reheat low-temperature zone improves, and then the temperature rise of double reheat low-temperature zone reduces, otherwise still.In conjunction with several means of adjusting of tilting burner, adjusting excess air coefficient and gas baffle, in the time of can guaranteeing underload or fuel change, twice reheater all reaches rated temperature.
Preferably, the single reheat device is near front wall collocation, secondary reheater is put near rear wall paper, because rear wall flue is near horizontal flue, flow velocity is fast with respect to the front wall flue, and the steam pressure of secondary reheater is less than single reheat device pressure, heat-transfer character is less better, therefore secondary reheater is arranged near rear wall, is conducive to heat absorption, so that first and second reheater heat absorption balance.
The heat absorption percentage of double reheat boiler superheater of the present invention and single reheat device and secondary reheater is, the superheater caloric receptivity is 65%-75%, single reheat device caloric receptivity is 15%-25%, the secondary reheater caloric receptivity is 10%-15%, three's sum is 100%, preferred proportion is about 71:17:12, and each proportional numbers is positive and negative 1 interior floating, and each proportional numbers sum is 100.Steam pressure in the superheater is 30MPa-35MPa, and the steam pressure in the single reheat device is 5MPa-13MPa, and the steam pressure in the secondary reheater is 2MPa-5MPa.The material of first and second reheater is identical, be high-grade stainless steel, the trade mark for example is: SA-213TP347HFG, SA-213TP310HcbN, SA-213S304H, SA-335pg1,15CrMoG, 12Cr1MoVG, SA213T12, SA213T23, SA-335T91, SA210C.
Description of drawings
Fig. 1 is the schematic side view of boiler;
Description of reference numerals: front water wall 1, rear water wall 2, middle mixing header 3, water-cooling wall import header 4, furnace roof 5, burner hearth 6, burner 7, the horizontal flue 8 of the second flue, the vertical gas pass 9 of the second flue, economizer 10, single reheat low-temperature reheater 11, double reheat low-temperature reheater 12, single reheat high temperature reheater hot arc 13, cold section 14 of single reheat high temperature reheater, low temperature superheater screen pipeline section 15, low temperature superheater vertical section heating surface 16, partition wall bottom (not being with fin) 17, finned partition wall 18, separator 19, low temperature superheater import header 20, gas baffle 21, low temperature superheater suspention inlet tube 22, top column pipe 23, low temperature superheater outlet header 24, vertical section heating surface 25, economizer import header 26, economizer exit header 27, water-cooling wall outlet header 28, double reheat high temperature reheater hot arc 29, cold section 30 of double reheat high temperature reheater, high temperature superheater 31, burner hearth vertical gas pass 32.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments, but the present invention is not limited to following embodiment.
As shown in Figure 1, it is that burner hearth vertical gas pass 32, the first flues are divided into up and down separation flue and flue collector that boiler comprises burner hearth 6, the first flues, separates flue and is divided into front flue and rear pass by finned partition wall 18; Finned partition wall is not finned heating surface light pipe 17 below 18, owing to there is not the separation of fin, flue gas is not stopped, and finned partition wall 18 is fin panel casing; The second flue divides horizontal flue 8 and vertical gas pass 9.This boiler for example is the boiler of coal dust burning.
By burner hearth 6, enter the first flue 32 of vertical direction from the high-temperature fuel gas of a plurality of burners 7 of burner hearth 6 bottoms, then enter the horizontal flue 8 of the second flue, then enter the vertical gas pass 9 of the second flue.
The upper furnace vertical gas pass has the low temperature pendant superheater along flue gas flow direction successively arranged in series, first and second cold section of hot high temperature reheater again, high temperature superheater, first and second is hot high temperature reheater hot arc and first and second hot low-temperature reheater more again, the front-back wall economizer, low temperature superheater suspention inlet tube; Cold section of cold section of single reheat device and secondary reheater are arranged in parallel, and single reheat device hot arc and secondary reheater hot arc are arranged in parallel, and single reheat low-temperature reheater and double reheat low-temperature reheater are arranged in parallel.
As shown in Figure 1, boiler is the coal-fired Turbo-generator Set of 1000MW grade, ultra supercritical parameter variable-pressure operation spirally-wound tubes Once-through Boiler, single burner hearth, double reheat, employing tangential firing mode, balanced draft, dry ash extraction, all steel overhung construction tower boiler, open-air cloth placed fire coal boiler.
Shown in Fig. 1 and table 1, main vapour system flow is: before feedwater enters and enters after the economizer import header 26, rear pass economizer 10, front and back flue economizer is for being arranged in parallel, water enters economizer exit header 27 after heating in economizer, water-cooling wall 1 before and after entering after water in the economizer exit header is converged by lower furnace portion water-cooling wall import header 4,2, heating is laggard in water-cooling wall enters water-cooled wall outlet header 28, the water-cooling wall outlet header connects steam-water separator 19, separator outlet steam enters in low temperature superheater 15 and the high temperature superheater 31 successively, finally enters the steam turbine acting.
Boiler Furnace front porch width perpendicular direction is arranged 6 steam-water separators, and its import and export are connected with low temperature superheater with water-cooling wall respectively.Work as unit starting, when boiler load is lower than minimal once-through circulation load 30%BMCR, enter separator behind the distributor of MEDIA FLOW before separator of evaporating heating surface outlet and carry out carbonated drink separation, steam enters primary superheater after entering two distributors by separator upper tube joint, saturation water then enters in 1 water storage tank in below by each 1 connecting pipe in separator stack shell below, and water storage tank is provided with water level control.1 drain water piping in water storage tank below causes a connector.Hydrophobic to recirculating system by connector one tunnel, another road is connected in the air suspended type flash vessel.
Burner hearth is comprised of membrane wall, and water-cooling wall adopts helix tube to add the arrangement of vertical tube.Adopt spirally-wound tubes around from the import of burner hearth furnace hopper to high temperature superheater end burner hearth; It is vertical tube coil above the high temperature superheater end.
The superheater steam temperature regulates by coal-water ratio and two-stage sprays water to control.First and second reheater steam temperature adopts burner swing to regulate synchronously, regulates the balance of absorbing heat between first and second reheater by gas baffle.The trace water spray is set on the low-temperature reheater outlet connecting pipe road.
Key technology of the present invention
1, heating surface is arranged
The double reheat boiler is compared with the single reheat boiler has increased by one group of high-temperature surface, high temperature superheater, single reheat high temperature reheater and double reheat high temperature reheater are arranged, and the heat absorption ratio of reheater significantly increases, therefore in design, need to consider rationally to carry out the variation that heating surface mates to satisfy superheated steam and reheated steam heat absorption, satisfy simultaneously the requirement of the security that brings of reheated steam outlet temperature raising.
If single reheat design concept routinely, every one-level heating surface arranged in series can cause having the one-level high-temperature surface can't obtain enough heat exchange temperature and pressure, thereby needs to arrange the heat exchange area of a large amount of inefficiencies.So in double reheat heating surface design, adopt audaciously the part reheater in advance, the absorption portion radiations heat energy, and with twice height mode of being arranged in parallel of heating surface again, reach the optimum balance of heat exchange, economy, security.Because low temperature superheater is first and second again before cold section of the hot high temperature reheater, blocked the part heat radiation, therefore low temperature superheater is designed to shield the tubular type superheater, distance between screen and the screen is larger, distance is 700mm-1300mm approximately, preferred 900mm-1100mm, the part heat radiation can penetrate low temperature superheater screen pipe, arrives first and second cold section of hot high temperature reheater again.First and second colder section of hot high temperature reheater be designed to shield tubular type, the screen that part is arranged in low temperature superheater with shield between the top at neutral place, can accept heat radiation, temperature is also higher herein, surpass 1000 ℃, even reach 1300 ℃-1500 ℃, have higher thermal radiation property; First and second colder section of hot high temperature reheater also comprise vertical section heating surface (25), vertical section heating surface (25) with first and second hotter high temperature reheater hot arc link to each other, vertical section heating surface (25) is arranged in the burner hearth, preferably be arranged on the burner hearth centre position, most preferably be arranged on the both sides of not finned partition wall 17.Be designed to shield the low temperature superheater of tubular type, the distance between screen and the screen is larger, can see through heat radiation; Low temperature superheater also comprises vertical section heating surface 16, and vertical section heating surface 16 also can suspend the economizer, reheater, high temperature superheater of low temperature superheater tube panel section top etc. in midair, as the suspention stress point of these heating surfaces.Cold section of low-temperature reheater and hot high temperature reheater again link to each other by the outer header of burner hearth in addition, and more specifically, the low-temperature reheater outlet header links to each other by pipeline with cold section import header of hot high temperature reheater again.
2 method of temperature control
In unit running process, no matter often need at full capacity or underload, superheated steam outlet temperature or the reheated steam outlet temperature all can reach design load, unit just can obtain higher efficient like this.In the lower unit of steam exit temperature, the selection of method of temperature control has been an important problem, and for the double reheat ultra supercritical unit of the steam exit temperature more than 600 ℃ of selecting, double reheat, the selection of method of temperature control is just even more important.
From the acting ability of steam at different levels, the temperature of a vapour is superior to the temperature rank of secondary vapour, and the temperature of secondary vapour is superior to the temperature rank of three vapour.When carrying out the temperature adjustment Scheme Choice, need to control respectively steam at different levels.
3 reheated steam temperature adjustment schemes
Present embodiment reheated steam method of temperature control: tilting burner+gas baffle+spray desuperheating.
The target of temperature adjustment: by adopting effective adjustment means, guarantee that the single reheat steam exit temperature all can reach design load with the double reheat steam exit temperature under 50% ~ 100%BMCR operating mode under 65% ~ 100%BMCR operating mode.
The thermoregulation effect of reheated steam during for effective solution underload, Burner design can swing up and down, the height of the oscillation adjustment combustion centre by burner, change the flue-gas temperature of furnace outlet by the adjustment of combustion centre, affect the caloric receptivity of high temperature reheater, thereby regulate the reheated steam outlet temperature.Because a secondary height all is provided with the heating surface of a part of radiation-absorbing heat again, the variation of flame kernel is remarkable on the impact of reheat steam temperature, can guarantee that a secondary reheater reaches specified steam temperature in larger load range.Select simultaneously the gas baffle method of temperature control, separate the flue gas share in the flue before and after entering by baffle opening control, the heat absorption allocation proportion that changes between a secondary reheater reaches the purpose of regulating a secondary reheater outlet temperature balance.Simultaneously in addition, the pipeline configuration spray desuperheating at reheater prevents the generation of overtemperature situation and the vapor (steam) temperature deviation of effective control left and right sides.
Arrange 4 micro-spray desuperheatings between low-temperature reheater and the high temperature reheater, 2 spray desuperheatings are arranged in the low-temperature reheater import, spray desuperheating does not put into operation under accidental conditions, only under the emergency episode operating mode, move, total water spray ability is 3%, and the ability of pipeline and valve is considered according to 250% of design injection flow rate.
This programme first and second again steam out temperature of hot vapour relatively approaches, and the ratio and first and second of first and second reheater heating surface area hotter caloric receptivity ratio also is basically identical.So it is essentially identical with the trend of load variations that the form that first and second reheater heating surface is arranged in parallel can guarantee twice reheater caloric receptivity.By the adjustment of tilting burner to flame kernel, can guarantee that first and second reheater outlet steam temperature all reaches rated value substantially, reached balance by the adjustment of tail flue gas baffle plate with regard to little caloric receptivity difference between the two originally again.In addition, first and second reheater has all been arranged a part of radiation heating-surface, and boiler has been had in the characteristics that also have good reheat steam temperature than underload.
Claims (8)
1. tower boiler with twice reheater, described boiler is super critical boiler, the heating surface of described boiler comprises superheater, single reheat device, secondary reheater; Superheater comprises low temperature superheater, high temperature superheater; It is characterized in that:
Main vapour system flow is: feedwater enters forward and backward flue economizer (10), front and back flue economizer is for being arranged in parallel, economizer exit water enters water-cooling wall (1) by lower furnace portion, the water-cooling wall outlet connects separator (19), separator outlet steam enters in low temperature superheater and the high temperature superheater (31) successively, finally enters the steam turbine acting;
The steam of single reheat device flows to from the steam side temperature from low to high from the steam turbine steam discharge, and the single reheat device comprises single reheat low-temperature reheater (11), single reheat high temperature reheater successively; This steam enters in the steam turbine and does work at last;
The steam of single reheat device namely becomes the steam discharge of steam turbine after the steam turbine acting; The steam of secondary reheater flows to from the steam side temperature from low to high from the steam discharge of this steam turbine, comprises double reheat low-temperature reheater (12), double reheat high temperature reheater; This steam enters the steam turbine acting at last;
Single reheat device and secondary reheater are arranged in parallel in the burner hearth vertical gas pass.
2. described tower boiler with twice reheater according to claim 1 is characterized in that:
The single reheat high temperature reheater is divided into cold section (14) and hot arc (13), and the double reheat high temperature reheater is divided into cold section (30) and hot arc (29);
Low temperature superheater comprises low temperature superheater suspention inlet tube (22) from steam flow, low temperature superheater vertical section heating surface (16) and low temperature superheater screen pipeline section (15);
Described first and second colder section of hot high temperature reheater arrange in advance, namely be placed on the high temperature superheater arranged beneath, be in the strong zone of radiation characteristic, the absorption portion radiant heat, described first and second hotter high temperature reheater hot arc be placed on the high temperature superheater top and arrange;
The upper furnace vertical gas pass has low temperature superheater screen pipeline section along flue gas flow direction successively arranged in series, first and second cold section of hot high temperature reheater again, high temperature superheater, first and second hot high temperature reheater hot arc again, first and second hot low-temperature reheater again, economizer and low temperature superheater suspention inlet tube; Cold section of cold section of single reheat device and secondary reheater are arranged in parallel, and single reheat device hot arc and secondary reheater hot arc are arranged in parallel, and single reheat low-temperature reheater and double reheat low-temperature reheater are arranged in parallel.
3. described tower boiler with twice reheater according to claim 2 is characterized in that:
Described low temperature superheater screen pipeline section, the distance between screen and the screen is larger, can see through heat radiation; Described low temperature superheater vertical section heating surface (16) also can suspend economizer, reheater, the high temperature superheater of low temperature superheater screen pipeline section top in midair;
First and second colder section of hot high temperature reheater be designed to shield tubular type, the screen that part is arranged in low temperature superheater with shield between the top at neutral place, can accept heat radiation;
Described first and second colder section of hot high temperature reheater also comprise vertical section heating surface (25), connect by the vertical section heating surface (25) that is arranged in the vertical gas pass between described cold section and the hot arc.
4. described tower boiler with twice reheater according to claim 3 is characterized in that:
Smoke gas flow crosses first and second again behind the hot high temperature reheater hot arc, exhaust gases passes is separated mid-feather and is divided into forward and backward flue, front flue is furnished with single reheat low-temperature reheater and front flue economizer, and rear pass is furnished with double reheat low-temperature reheater and rear pass economizer; Separate mid-feather and extend to the second flue entrance place, and gas baffle is set herein for flue gas flow before and after regulating;
Described separation mid-feather is made of the column pipe membrane wall, and this column pipe membrane wall is drawn from low temperature superheater import header as the part of low temperature superheater, gets back to the low temperature superheater outlet header or gets back to middle mixing header;
The single reheat device is near front wall collocation, and secondary reheater is put near rear wall paper.
5. described tower boiler with twice reheater according to claim 3 is characterized in that:
Described superheater, single reheat device and secondary reheater outlet steam temperature reach 600 ℃ to 695 ℃;
The heat absorption percentage of double reheat boiler superheater and single reheat device and secondary reheater is, the superheater caloric receptivity is 65%-75%, and single reheat device caloric receptivity is 15%-25%, and the secondary reheater caloric receptivity is 10%-15%, and three's sum is 100%.
6. described tower boiler with twice reheater according to claim 4 is characterized in that:
Steam pressure in the described superheater is 28MPa-35MPa;
Steam pressure in the described single reheat device is 5MPa-14MPa;
Steam pressure in the described secondary reheater is 2MPa-5MPa.
7. described tower boiler with twice reheater according to claim 3 is characterized in that:
Burner hearth is comprised of fin panel casing, and the bottom water-cooling wall adopts helix tube; The top water-cooling wall adopts the arrangement of vertical tube;
Described feedwater enters after the forward and backward flue economizer, then enter successively the lower furnace portion spiral and center on pipeloop, enter middle mixing header, the vertical tube panel of upper furnace, separator, low temperature superheater and high temperature superheater, last steam enters the acting of steam turbine high pressure cylinder.
8. described tower boiler with twice reheater according to claim 3 is characterized in that:
The superheater steam temperature regulates by coal-water ratio and two-stage sprays water to control; First and second reheater steam temperature adopts burner swing to regulate synchronously, regulates the balance of absorbing heat between first and second reheater by gas baffle; The trace water spray is set on the low-temperature reheater outlet connecting pipe road.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335374.XA CN102889570B (en) | 2012-09-11 | 2012-09-11 | Tower-type boiler with primary reheater and secondary reheater |
| PL409128A PL237933B1 (en) | 2012-09-11 | 2013-08-27 | Tower boiler equipped with main interstage superheater and auxiliary superheater |
| MYPI2014702651A MY176444A (en) | 2012-09-11 | 2013-08-27 | Tower-type boiler with primary reheater and secondary reheater |
| PCT/CN2013/082333 WO2014040491A1 (en) | 2012-09-11 | 2013-08-27 | Tower-type boiler with primary reheater and secondary reheater |
| ZA2014/06664A ZA201406664B (en) | 2012-09-11 | 2014-09-11 | Tower-type boiler with primary reheater and secondary reheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335374.XA CN102889570B (en) | 2012-09-11 | 2012-09-11 | Tower-type boiler with primary reheater and secondary reheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102889570A true CN102889570A (en) | 2013-01-23 |
| CN102889570B CN102889570B (en) | 2014-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210335374.XA Active CN102889570B (en) | 2012-09-11 | 2012-09-11 | Tower-type boiler with primary reheater and secondary reheater |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN102889570B (en) |
| MY (1) | MY176444A (en) |
| PL (1) | PL237933B1 (en) |
| WO (1) | WO2014040491A1 (en) |
| ZA (1) | ZA201406664B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102889570B (en) | 2014-11-12 |
| PL237933B1 (en) | 2021-06-14 |
| MY176444A (en) | 2020-08-10 |
| PL409128A1 (en) | 2015-07-20 |
| WO2014040491A1 (en) | 2014-03-20 |
| ZA201406664B (en) | 2019-05-29 |
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