CN102889570B - 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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- CN102889570B CN102889570B CN201210335374.XA CN201210335374A CN102889570B CN 102889570 B CN102889570 B CN 102889570B CN 201210335374 A CN201210335374 A CN 201210335374A CN 102889570 B CN102889570 B CN 102889570B
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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
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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 has twice reheater for power industry.
Background technology
In power plant, steam becomes relatively low pressure after doing work in steam turbine high-pressure cylinder, by high pressure cylinder, discharged, enter in boiler single reheat device and heat, and discharge after supplying with the acting of steam turbine single reheat intermediate pressure cylinder, enter in 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 heat thermodynamic cycle than the thermodynamic cycle of single reheat, there is higher efficiency.The above-mentioned boiler with double reheat is for power plant.
Efficiency of thermal cycle influence factor is mainly contained to steam pressure, vapor (steam) temperature and the reheating stage number for doing 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 over 580 ℃.In order further to improve efficiency of thermal cycle, the present invention proposes overheating steam temperature and reheat steam temperature all reaches 600 ℃ of above double reheat boilers.
Conventionally 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 ℃, conventionally reheater is arranged in to cigarette temperature area in the region of 1000 ℃ to 800 ℃, 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 conducting heat, need to have enough heat transfer temperature differences, 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 the heating surface of 600 ℃, become a difficult point of high parameter double reheat boiler design.
In addition, the adjusting of single reheat steam temperature generally adopts tilting burner, regulates a kind of can the meeting the demands in the means such as gas baffle.Owing to there is twice reheater, the steam temperature that how to regulate twice reheater is 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 boiler.Working medium in boiler is all 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, in stove, power pressure is just subcritical boiler lower than this pressure, being greater than this pressure is exactly super critical boiler, 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 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.; Having in addition other applicants is 350MW supercritical tower-type boiler using brown coal in the denomination of invention of application on December 21st, 2011, and application number is 201110432324.9.
Summary of the invention
The object 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 within the scope of 600 ℃-695 ℃, according to requirement of engineering, preferably 610 ℃-620 ℃ and 630 ℃-650 ℃ of temperature.
In order to realize object of the present invention, technical scheme of the present invention is:
A tower boiler with twice reheater, boiler is super critical boiler, 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, water-cooling wall outlet connects separator, separator outlet steam enters in low temperature superheater and high temperature superheater successively, finally enters steam turbine acting;
The steam of single reheat device, from steam turbine steam discharge, flows to from low to high from steam side temperature, and single reheat device comprises single reheat low-temperature reheater, single reheat high temperature reheater successively; Finally this steam enters in steam turbine and does work;
The steam of single reheat device, after steam turbine acting, becomes the steam discharge of steam turbine; The steam of secondary reheater, from the steam discharge of this steam turbine, flows to from low to high from steam side temperature, comprises double reheat low-temperature reheater, double reheat high temperature reheater; Finally this steam enters steam turbine acting;
Single reheat device and secondary reheater are arranged in parallel in burner hearth vertical gas pass.
Preferably, single reheat high temperature reheater is divided into cold section and hot arc, and double reheat high temperature reheater is divided into cold section and hot arc;
Low temperature superheater, from steam flow, comprises low temperature superheater suspention inlet tube, 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, be placed on high temperature superheater arranged beneath, be in the region that radiation characteristic is strong, absorption portion radiant heat, first and second hotter high temperature reheater hot arc be placed on high temperature superheater top and arrange;
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 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 vertical section heating surface, between cold section and hot arc, by the vertical section heating surface being arranged in vertical gas pass, connect.
Preferably, smoke gas flow crosses first and second again after 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 consist of column pipe membrane wall, this column pipe membrane wall, as a part for low temperature superheater, is drawn from low temperature superheater import header, gets back to low temperature superheater outlet header or gets back to middle mixing header;
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, superheater caloric receptivity is 65%-75%, and single reheat device caloric receptivity is 15%-25%, and secondary reheater caloric receptivity is 10%-15%, and three's sum is 100%.
Preferably, the steam pressure in superheater is 28MPa-35MPa; Steam pressure in single reheat device is 5MPa-14MPa;
Steam pressure in secondary reheater is 2MPa-5MPa.
Preferably, burner hearth is comprised of fin panel casing, and bottom water-cooling wall adopts helix tube; Top water-cooling wall adopts the arrangement of vertical tube;
After feedwater enters forward and backward flue economizer, then enter successively lower furnace portion spiral around pipeloop, enter in the middle of 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.
Preferably, superheater steam temperature is regulated with two-stage and is sprayed water to control by coal-water ratio; First and second reheater steam temperature synchronously adopts burner swing to regulate, and by gas baffle, regulates the balance of absorbing heat between first and second reheater; Trace water spray is set on low-temperature reheater outlet connecting pipe road.
Therefore, the present invention is placed in the flue near burner hearth part by part reheater heating surface, so as to the radiations heat energy of absorption portion burner hearth, thereby reaches the object that obtains enough temperature rises with less area.When meanwhile, reheater has radiation heating-surface characteristic to load reduction, guarantee that reheater export amount fixed temperature is also helpful.
Because radiations heat energy is having very large decline through after heating surface.For making twice outlet temperature can absorption portion radiant heat at more than 600 ℃ reheaters, 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 increase Liao Yi road to require to reach 600 ℃ of above steam, in other words general, 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, to there is a fixed difference difference, the heating surface that two outlet temperatures reach 600 ℃ is put in general continuous series connection, thereafter flue-gas temperature is just not enough to the 3rd heating surface to be heated to 600 ℃, so the present invention has adopted scheme in parallel, allow two heating surfaces share higher cigarette temperature.The object 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 current 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, steam heat-transfer character is better, the characteristic of steam has determined under 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 current high parameter double reheat scheme will accurately be calculated heating surface to arrange, not only met and reached temperature but also reach safe and reliable.
The temperature regulation characteristic of reheater, by tilting burner, regulates excess air coefficient and gas baffle to regulate in conjunction with completing.Swing by burner makes flame kernel in burner hearth raise or reduce, and therefore the reheater outlet temperature with radiation characteristic can raise or reduce.Because twice reheater is arranged in parallel, and in same cigarette temperature area, so their variation tendency is identical.Increase excess air coefficient and make to increase by the flue gas flow rate of heating surface, also there is the effect that improves reheater heat exchange.Top flue is divided into former and later two flues by column pipe membrane wall midfeather, in two flues, be furnished with respectively the low-temperature zone of single reheat device and the low-temperature zone of secondary reheater, this column pipe membrane wall is as a part for low temperature superheater, from low temperature superheater import header, draw, get back to low temperature superheater outlet header or get back to middle mixing header.Midfeather extends to back-end ductwork porch always, and two flue gas flow controllable registers are set herein.Its object is to control by the aperture of controllable register the flue gas flow of former and later two flues, to reach the object that regulates 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 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, 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 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, makes 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, superheater caloric receptivity is 65%-75%, single reheat device caloric receptivity is 15%-25%, 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 superheater is 30MPa-35MPa, and the steam pressure in single reheat device is 5MPa-13MPa, and the steam pressure in secondary reheater is 2MPa-5MPa.The material of first and second reheater is identical, be high-grade stainless steel, the trade mark is for example: SA-213TP347HFG, SA-213TP310HcbN, SA-213S304H, SA-335pg1,15CrMoG, 12Cr1MoVG, SA213T12, SA213T23, SA-335T91, SA210C.
Accompanying drawing explanation
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
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, 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 separation flue and flue collector up and down 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, and owing to there is no the separation of fin, flue gas is not blocked, and finned partition wall 18 is fin panel casing; The second flue divides horizontal flue 8 and vertical gas pass 9.This boiler is for example the boiler of coal dust burning.
From the high-temperature fuel gas of a plurality of burners 7 of burner hearth 6 bottoms, by burner hearth 6, enter the first flue 32 of vertical direction, then enter the horizontal flue 8 of the second flue, then enter the vertical gas pass 9 of the second flue.
Upper furnace vertical gas pass has 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, 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.
Top column pipe 23 is obstructed circulation mediums, for suspending low temperature superheater suspention inlet tube 22 in midair.
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, outdoor cloth placed fire coal boiler.
As shown in Fig. 1 and table 1, main vapour system flow is: before feedwater enters and enters after 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 water in economizer exit header enters after being converged by lower furnace portion water-cooling wall import header 4, 2, in water-cooling wall, after heating, enter water-cooling wall outlet header 28, water-cooling wall outlet header connects steam-water separator 19, separator outlet steam enters in low temperature superheater 15 and high temperature superheater 31 successively, finally enter steam turbine acting.
Boiler Furnace front porch width direction is arranged vertically 6 steam-water separators, and its import and export are connected with low temperature superheater with water-cooling wall respectively.Work as unit starting, boiler load is during lower than minimal once-through circulation load 30%BMCR, the MEDIA FLOW of evaporating heating surface outlet enters separator and carries out carbonated drink separation after the distributor before separator, steam enters primary superheater after entering two distributors by separator upper tube joint, saturation water enters in 1 water storage tank in below by each 1 of below of separator stack shell connecting pipe, and water storage tank is provided with water level and controls.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 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.From the import of burner hearth furnace hopper to high temperature superheater end burner hearth surrounding, adopt spirally-wound tubes; It above high temperature superheater end, is vertical tube coil.
Superheater steam temperature regulates by coal-water ratio and two-stage sprays water to control.First and second reheater steam temperature synchronously adopts burner swing to regulate, and by gas baffle, regulates the balance of absorbing heat between first and second reheater.Trace water spray is set on low-temperature reheater outlet connecting pipe road.
Key technology of the present invention
1, heating surface is arranged
Double reheat boiler is compared with single reheat boiler has increased by one group of high-temperature surface, there are high temperature superheater, single reheat high temperature reheater and double reheat high temperature reheater, and the heat absorption ratio of reheater significantly increases, therefore in design, need to consider rationally to carry out heating surface coupling to meet the variation of superheated steam and reheated steam heat absorption, meet the requirement of the security bringing of reheated steam outlet temperature raising simultaneously.
If single reheat design concept routinely, every one-level heating surface arranged in series, can cause having one-level high-temperature surface cannot obtain enough heat exchange temperature and pressure, thereby need to arrange the heat exchange area of a large amount of inefficiencies.Therefore in the design of double reheat heating surface, adopt audaciously part reheater in advance, absorption portion radiations heat energy, and by twice high mode that heating surface is arranged in parallel again, reach the optimum balance of heat exchange, economy, security.Because low temperature superheater is first and second again before cold section of hot high temperature reheater, blocked part heat radiation, therefore low temperature superheater is designed to shield tubular type superheater, distance between screen and screen is larger, distance is approximately 700mm-1300mm, preferred 900mm-1100mm, 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 ℃, there is 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 be connected, vertical section heating surface (25) is arranged in burner hearth, preferably be arranged on burner hearth centre position, be most preferably 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 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.Low-temperature reheater is connected by the header outside burner hearth with cold section of hot high temperature reheater more in addition, and more specifically, low-temperature reheater outlet header is connected by pipeline with cold section of 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 reheated steam outlet temperature all can reach design load, unit just can obtain higher efficiency like this.In the lower unit of steam exit temperature, the selection of method of temperature control has been an important problem, and for 600 ℃ that select above steam exit temperatures, the double reheat ultra supercritical unit of 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 temperature adjustment Scheme Choice, need to control respectively steam at different levels.
3 reheated steam temperature adjustment schemes
The present embodiment reheated steam method of temperature control: tilting burner+gas baffle+spray desuperheating.
The target of temperature adjustment: by adopting effective temperature regulating measure, guarantee that single reheat steam exit temperature all can reach design load with 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, the design of burner can swing up and down, the height of the oscillation adjustment combustion centre by burner, by the adjustment of combustion centre, change the flue-gas temperature of furnace outlet, affect the caloric receptivity of high temperature reheater, thereby regulate reheated steam outlet temperature.Due to one or two high heating surfaces that are all provided with again a part of radiation-absorbing heat, 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 gas baffle method of temperature control simultaneously, control the flue gas share entering in front and back separation flue by baffle opening, the heat absorption allocation proportion changing between a secondary reheater reaches the object that regulates a secondary reheater outlet temperature balance.In addition, on the pipeline of reheater, configure the vapor (steam) temperature deviation that spray desuperheating prevents the generation of overtemperature situation and effectively controls left and right sides simultaneously.
Between low-temperature reheater and high temperature reheater, arrange 4 micro-spray desuperheatings, 2 spray desuperheatings are arranged in low-temperature reheater import, under accidental conditions, spray desuperheating does not put into operation, only under 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 is also basically identical.Therefore 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.Adjustment by 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, boiler has been had and compared with underload, also have the feature of good reheat steam temperature.
Claims (7)
1. a 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, water-cooling wall outlet connects separator (19), separator outlet steam enters in low temperature superheater and high temperature superheater (31) successively, finally enters steam turbine acting;
The steam of single reheat device, from steam turbine steam discharge, flows to from low to high from steam side temperature, and single reheat device comprises single reheat low-temperature reheater (11), single reheat high temperature reheater successively; Finally this steam enters in steam turbine and does work;
The steam of single reheat device, after steam turbine acting, becomes the steam discharge of steam turbine; The steam of secondary reheater, from the steam discharge of this steam turbine, flows to from low to high from steam side temperature, comprises double reheat low-temperature reheater (12), double reheat high temperature reheater; Finally this steam enters steam turbine acting;
Single reheat device and secondary reheater are arranged in parallel in burner hearth vertical gas pass;
Single reheat high temperature reheater is divided into cold section (14) and hot arc (13), and double reheat high temperature reheater is divided into cold section (30) and hot arc (29);
Low temperature superheater, from steam flow, comprises low temperature superheater suspention inlet tube (22), 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, be placed on high temperature superheater arranged beneath, be in the region that radiation characteristic is strong, absorption portion radiant heat, described first and second hotter high temperature reheater hot arc be placed on high temperature superheater top and arrange;
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.
2. there is according to claim 1 the tower boiler of twice reheater, it is characterized in that:
Described low temperature superheater screen pipeline section, the distance between screen and 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), between described cold section and hot arc, by the vertical section heating surface (25) being arranged in vertical gas pass, connect.
3. there is according to claim 2 the tower boiler of twice reheater, it is characterized in that:
Smoke gas flow crosses first and second again after 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 consists of column pipe membrane wall, and this column pipe membrane wall, as a part for low temperature superheater, is drawn from low temperature superheater import header, gets back to low temperature superheater outlet header or gets back to middle mixing header;
Single reheat device is near front wall collocation, and secondary reheater is put near rear wall paper.
4. there is according to claim 2 the tower boiler of twice reheater, it 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, superheater caloric receptivity is 65%-75%, and single reheat device caloric receptivity is 15%-25%, and secondary reheater caloric receptivity is 10%-15%, and three's sum is 100%.
5. there is according to claim 3 the tower boiler of twice reheater, it is characterized in that:
Steam pressure in described superheater is 28MPa-35MPa;
Steam pressure in described single reheat device is 5MPa-14MPa;
Steam pressure in described secondary reheater is 2MPa-5MPa;
6. there is according to claim 2 the tower boiler of twice reheater, it is characterized in that:
Burner hearth is comprised of fin panel casing, and bottom water-cooling wall adopts helix tube; Top water-cooling wall adopts the arrangement of vertical tube;
After described feedwater enters forward and backward flue economizer, then enter successively lower furnace portion spiral around pipeloop, enter in the middle of 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.
7. there is according to claim 2 the tower boiler of twice reheater, it is characterized in that:
Superheater steam temperature regulates by coal-water ratio and two-stage sprays water to control; First and second reheater steam temperature synchronously adopts burner swing to regulate, and by gas baffle, regulates the balance of absorbing heat between first and second reheater; Trace water spray is set on 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 |
| PCT/CN2013/082333 WO2014040491A1 (en) | 2012-09-11 | 2013-08-27 | 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 |
| 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 CN102889570A (en) | 2013-01-23 |
| CN102889570B true CN102889570B (en) | 2014-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| CN102889570B (en) * | 2012-09-11 | 2014-11-12 | 上海锅炉厂有限公司 | Tower-type boiler with primary reheater and secondary reheater |
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| CN110332514A (en) * | 2019-08-22 | 2019-10-15 | 哈尔滨锅炉厂有限责任公司 | A kind of efficient wide load double reheat tower-type furnace economizer hierarchical arrangement system |
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| CN114110559B (en) * | 2021-11-12 | 2023-05-23 | 东方电气集团东方锅炉股份有限公司 | Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method |
| CN114754345B (en) * | 2022-04-24 | 2024-05-24 | 西安热工研究院有限公司 | Boiler and thermal power generating unit with baffle assembly |
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- 2012-09-11 CN CN201210335374.XA patent/CN102889570B/en active Active
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2013
- 2013-08-27 WO PCT/CN2013/082333 patent/WO2014040491A1/en active Application Filing
- 2013-08-27 MY MYPI2014702651A patent/MY176444A/en unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102889570A (en) | 2013-01-23 |
| PL237933B1 (en) | 2021-06-14 |
| PL409128A1 (en) | 2015-07-20 |
| WO2014040491A1 (en) | 2014-03-20 |
| ZA201406664B (en) | 2019-05-29 |
| MY176444A (en) | 2020-08-10 |
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