CN203147737U - Boiler with external steam heater - Google Patents
Boiler with external steam heater Download PDFInfo
- Publication number
- CN203147737U CN203147737U CN 201320090069 CN201320090069U CN203147737U CN 203147737 U CN203147737 U CN 203147737U CN 201320090069 CN201320090069 CN 201320090069 CN 201320090069 U CN201320090069 U CN 201320090069U CN 203147737 U CN203147737 U CN 203147737U
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- heating surface
- steam heater
- external steam
- boiler
- flue
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Abstract
The utility model discloses a boiler with an external steam heater, which comprises a hearth. The hearth is connected with a tail flue; the middle part of the tail flue is divided into a tail front flue and a tail rear flue by a partition wall; a first heating surface is formed in the tail front flue; a first flue gas regulation baffle is arranged below the first heating surface; a second heating surface is formed in the tail rear flue; and a second flue gas regulation baffle is arranged below the second heating surface. The boiler is characterized in that a heating surface of the external steam heater is only formed in the first heating surface or the second heating surface; the external steam heater comprises an external steam heater inlet collecting box and an external steam heater outlet collecting box; and the external steam heater inlet collecting box and the external steam heater outlet collecting box are respectively connected with both ends of the heating surface of the external steam heater. The boiler has the characteristics of simple system structure, small occupied area, cost saving, good regulation property and the like.
Description
Technical field
The utility model relates to a kind of boiler of establishing the external steam heater, relates in particular to the boiler of a kind of back-end ductwork separation and the adjustable band external steam of flow heater, belongs to the boiler technology field.
Background technology
Existing large-sized boiler heating surface generally is furnished with economizer, evaporimeter, superheater and reheater.For the temperature of the reheated steam of controlling reheater outlet meets the demands, method for regulating temperature commonly used has burner swinging method, reheater spray desuperheating method, flue gas recirculation method and gas baffle method for regulating temperature.
In double-flue boiler, the gas baffle method of temperature control is widely used.Adopt gas baffle to regulate the boiler of reheat steam temperature mode, back-end ductwork is separated into two flues, is called the preceding flue of afterbody and afterbody rear pass.Before afterbody, arrange different heating surfaces respectively in flue and the afterbody rear pass, flue gas temperature adjustment baffle arrangement separate flue below.For the boiler that adopts the gas baffle regulative mode, generally arrange two-stage (or two parts) reheater heating surface.Low temperature (or first) reheater is arranged in the preceding flue of afterbody, and high temperature (or second portion) reheater is arranged in the preceding horizontal flue of back-end ductwork.Arrange low temperature superheater in the afterbody rear pass.Economizer then be arranged in as required flue low-temperature reheater before the afterbody below, rear pass low temperature superheater the below or be arranged in the below of low temperature superheater in the afterbody rear pass separately.By regulating the aperture of flue gas temperature adjustment baffle plate, regulate by the flue gas flow in flue before the afterbody and the afterbody rear pass, change the caloric receptivity of heating surface in the forward and backward flue, especially change the caloric receptivity of low-temperature reheater, thereby reach the purpose of regulating reheat steam temperature.
As shown in Figure 1, be the structural representation of traditional double-flue boiler.The steam that the steam turbine high-pressure cylinder steam discharge comes enters reheated steam inlet header case 15, after low-temperature reheater 6.1 heating, enter low-temperature reheater outlet collection case 16, cause high temperature reheater inlet header case 17 by pipeline, after high temperature reheater 18 is heated to required vapor (steam) temperature, arrive high temperature reheater outlet collection case 19 again.The high temperature reheated steam that satisfies parameter request is introduced in the follow-up system, generally enters into Steam Turbine Through IP Admission and continues work done.Wherein, the below of low-temperature reheater 6.1 is equipped with preceding flue economizer 6.2, and the opposite side of low-temperature reheater 6.1 is equipped with rear pass economizer 7.2 for the below of second low temperature superheater, 7.1, the second low temperature superheaters 7.1 that separate by partition wall 5.
Be mainly used in the station boiler at above-described conventional gas baffle temperature-adjusting type boiler, the superheated steam that boiler produces is after the steam turbine high-pressure cylinder acting, steam discharge enters boiler reheater and heats again, and the reheated steam that produces enters Steam Turbine Through IP Admission and continues acting.General reheated steam outlet temperature is identical with the superheated steam outlet temperature or close, the ratio of reheated steam flow and superheat steam flow changes little with boiler load, the ratio that the reheated steam caloric receptivity accounts for the total caloric receptivity of boiler changes not quite with boiler load, and fluctuation range is in～5% scope.
Use in the boiler in non-power station at present, especially in the chemical system, because the steam parameter classification is determined according to the chemical-process needs, some steam need be heated to certain parameter, require more flexible to the flow of heating steam, temperature, pressure etc., the superheated steam that the power boiler of these steam and chemical system configuration produces is not specific relation aspect flow, pressure and temperature, generally is referred to as external steam.External steam can be provided by the chemical system beyond the boiler, also can be according to the steam that is obtained special parameter by the steam of boiler itself through decompression or pressure and temperature reducing later on.The general requirement of the heating of external steam is heated to it steam with certain degree of superheat or it is heated to higher temperature from the lower state of the degree of superheat from saturation state, but it is still lower that the outlet temperature of its requirement is compared with the boiler overheating steam outlet temperature, generally be lower than 450 ℃, and the boiler overheating steam outlet temperature is generally about 530～550 ℃.
Because the reheated steam outlet temperature that the reheated steam boiler that existing power station is used requires is consistent with its superheated steam outlet temperature or approaching, also in 530～550 ℃ of left and right sides scopes, therefore reheater generally is divided into two-stage (or two parts) reheater heating surface layout, and the outlet temperature of above-described non-power station after with the heating of the external steam that requires in the boiler is lower, generally be lower than 450 ℃, therefore, original reheater heating surface is used for heating external steam, the outlet temperature that can't obtain to be fit to.
Heating to external steam provides a solution in patent ZL200720303494.6, independent saturated vapor superheater is set, to realize being steam heated to the purpose of system's desired parameters.But this mode need increase the relevant system of a whole set of boiler, and as combustion apparatus, furnace wall, condensed water heater, air preheater etc., floor space is big, system complex, cost height.
Summary of the invention
The purpose of this utility model is to solve original reheater heating surface is used for heating external steam, the outlet temperature that can't obtain to be fit to; Independent saturated vapor superheater is set, but floor space is big, system complex, problem that cost is high, provide a kind of simple in structure, take up an area of little, save cost, the boiler of establishing the external steam heater that modulability is good.
In order to achieve the above object, the utility model provides a kind of boiler of establishing the external steam heater, comprise burner hearth, burner hearth is connected with back-end ductwork, the mid portion of back-end ductwork is divided into flue and afterbody rear pass before the afterbody by partition wall, be provided with first heating surface in the flue before the afterbody, be provided with first gas proportioning damper below first heating surface, be provided with second heating surface in the afterbody rear pass, be provided with second gas proportioning damper below second heating surface, it is characterized in that, external steam heater heating surface only is located in first heating surface or second heating surface, the external steam heater comprises external steam heater inlet header case and external steam heater outlet collection case, and external steam heater inlet header case is connected with the two ends of external steam heater heating surface respectively with external steam heater outlet collection case.
Preferably, described first heating surface is separately external steam heater heating surface or is made up of external steam heater heating surface and first economizer, and second heating surface is separately second economizer or is made up of low temperature superheater and second economizer.
Preferably, described first heating surface is separately first economizer or is made up of low temperature superheater and first economizer, and second heating surface is separately external steam heater heating surface or is made up of external steam heater heating surface and second economizer.
The utility model is by setting up external steam heater heating surface in the boiler of maturation, it is arranged for the single-stage heating surface, the external steam heater outlet no longer is connected to other boiler heating surface, can be by in existing boiler, the afterbody single flue being separated, arrange external steam heater heating surface in the separation flue therein, reach heating steam to the requirement of special parameter, satisfy in the non-electric power station system demand to steam parameter; Flue gas temperature adjustment baffle plate is set, and by the flue gas share of the forward and backward flue of baffle opening control and regulation afterbody, thereby the caloric receptivity of adjusting external steam heater heating surface reaches the purpose of regulating outlet temperature, has good adjusting function.The utility model can add floor space, not increase extra steam generator system and reach the effect that produces nominal parameter steam by not increasing or reducing, and it is simple to have system architecture, and it is convenient to implement, the advantage of saving cost.
Description of drawings
Fig. 1 is the structural representation of traditional double-flue boiler;
Fig. 2 is a kind of structural representation of establishing the boiler of external steam heater.
Description of reference numerals
1 is burner hearth, 2 is back-end ductwork, 3 is flue before the afterbody, 4 is the afterbody rear pass, and 5 is partition wall, and 6 is first heating surface, 6.1 be low-temperature reheater, 6.2 be preceding flue economizer, 7 is second heating surface, 7.1 is second low temperature superheater, 7.2 be the rear pass economizer, 8 is first gas proportioning damper, and 9 is second gas proportioning damper, and 10 is pendant superheater, 11 is high temperature superheater, 12 is first low temperature superheater, and 13 is external steam heater inlet header case, and 14 is external steam heater outlet collection case.15 is reheated steam inlet header case, and 16 are low-temperature reheater outlet collection case, and 17 is high temperature reheater inlet header case, and 18 is high temperature reheater, and 19 are high temperature reheater outlet collection case.
The specific embodiment
For the utility model is become apparent, now with preferred embodiment, and conjunction with figs. is described in detail below.
The utility model is a kind of boiler of establishing the external steam heater, is not less than the main steam (superheated steam) of 8.0MPa for generation of pressure.The utility model utilizes original power boiler equipment, increases the one-level heating surface therein, to heat external steam to required parameter.Original power boiler afterbody is designed to single flue, wherein arranges economizer.In order to heat external steam, original back-end ductwork 2 is divided into flue 3 and afterbody rear pass 4 before the afterbody.Set up external steam heater heating surface in the separation flue therein, namely first heating surface 6 or second heating surface 7 include external steam heater heating surface, and this external steam heater heating surface only is installed in first heating surface 6 or second heating surface 7.External steam heater heating surface is arranged for the single-stage heating surface, medium in the external steam heater heating surface has independently import and outlet, be external steam heater inlet header case 13 and external steam heater outlet collection case 14, external steam heater inlet header case 13 is connected with the two ends of external steam heater heating surface respectively with external steam heater outlet collection case 14, and no longer be connected to other boiler heating surface, its outlet medium satisfies the parameter request of follow-up system.
External steam after external steam heater heating surface is heated to required vapor (steam) temperature, enters external steam heater outlet collection case 14 after introducing external steam heater inlet header case 13, leads to the subsequent technique system by pipeline.
As shown in Figure 2, be a kind of structural representation of establishing the boiler of external steam heater.Burner hearth 1 is connected with back-end ductwork 2, the mid portion of back-end ductwork 2 that only produces a kind of superheated steam boiler of parameter is divided into flue 3 and afterbody rear pass 4 before the afterbody by partition wall 5, in the flue 3 first heating surface 6 is installed before the afterbody, first gas proportioning damper 8 is installed below first heating surface 6, second heating surface 7 is installed in the afterbody rear pass 4, second gas proportioning damper 9 is installed below second heating surface 7, and the bottom of flue 3 and afterbody rear pass 4 is incorporated in the back-end ductwork 2 before the afterbody.
External steam heater heating surface can be arranged in any to be separated in the flue, both can be arranged in the preceding flue 3 of afterbody, also can be arranged in the afterbody rear pass 4, can determine according to the trend of inlet steam pipeline and the convenience of layout.Externally the bottom of steam heater heating surface can arrange economizer.Separate in the flue at another, can arrange boiler economizer according to the needs of boiler design, perhaps boiler superheater, lower disposed boiler economizer are arranged in top.Namely one of them of first heating surface 6 and second heating surface 7 is the combination of external steam heater heating surface or external steam heater heating surface and economizer separately, and another is separately the combination of economizer or low temperature superheater and economizer.The steam of external steam heater outlet need lead to beyond the boiler flue 2, and in the flue 3 time, drawing of steam can be drawn by back-end ductwork front wall or back-end ductwork furnace roof before external steam heater heating surface is arranged in afterbody; When external steam heater heating surface was arranged in the afterbody rear pass 4, drawing of steam can be drawn by wall behind the back-end ductwork or back-end ductwork furnace roof.It is extremely temperature required with steam or with the original steam parameter different steam of the steam of boiler behind decompression or pressure and temperature reducing own that external system comes that external steam heater heating surface is used for heating boiler, its intake condition is saturation state or superheat state, and its outlet parameter is superheat state.。The medium of external steam heater heating surface has independently import and outlet, and its outlet is not connected with other heating surface of boiler.Gas proportioning damper is used for regulating the vapor (steam) temperature of external steam heater outlet at rated value.The adjustment of external steam heater outlet medium is undertaken by gas proportioning damper.Regulate flue gas flow by flue before the afterbody 3 and afterbody rear pass 4 by regulating the gas proportioning damper aperture, thereby regulate the caloric receptivity of external steam heater heating surface, to obtain needed outlet medium temperature.
The utility model is a kind of boiler of establishing the external steam heater, comprise burner hearth 1 and back-end ductwork 2, fuel produces flue gas after burner hearth 1 internal combustion, as shown in Figure 2, the direction of arrow is the approach axis of flue gas, flue gas enters back-end ductwork 2, begins before enter back-end ductwork 2 from burner hearth 1 top, and the order that enters by flue gas is furnished with pendant superheater 10, high temperature superheater 11 and first low temperature superheater 12 successively.Back-end ductwork 2 is divided into flue 3 and afterbody rear pass 4 before the afterbody by partition wall 5, has arranged economizer in the flue 3 before the afterbody; Arranged external steam heater heating surface in the afterbody rear pass 4.Flue 3 and afterbody rear pass 4 bottoms are respectively arranged with first gas proportioning damper 8 and second gas proportioning damper 9 before afterbody, and flue gas is flowed through and reconsolidated in back-end ductwork 2 behind first gas proportioning damper 8 and second gas proportioning damper 9.The flue gas of outlet is flowed through and is discharged boiler behind the air preheater.
The boiler common property is given birth to two parameter grade steam in the present embodiment, first parameter grade is the high pressure superheated steam parameter, mainly be with high pressure boiler water supply (pressure 14.0MPa, 200 ℃ of temperature) after economizer, evaporimeter and superheater heating, produce high pressure superheated steam, outlet superheated steam parameter is: flow 600t/h, pressure 12.5MPa, 540 ℃ of temperature.Economizer, pendant superheater 10, high temperature superheater 11 and first low temperature superheater 12 all belong to the heating surface of this parameter grade.Second parameter grade is middle pressure parameter, and flow is 250t/h, and inlet pressure is 2.6MPa, and inlet temperature is saturation temperature, and outlet temperature is 340 ℃.The middle steam source of parameter of pressing is outside other process system steam of boiler, and its heat absorption at boiler internal is finished by external steam heater heating surface.
Boiler is in operation needs control superheat steam temperature and middle pressure steam temperature to reach rated value simultaneously.The pressure and temperature parameter of above-mentioned middle pressure parameter steam is constant, its flow fluctuates with the demand of outside other process system of boiler in 200～300t/h scope, but steam flow and the not specific relation of boiler load with the boiler overheating steam outlet do not reduce with boiler load.In order to guarantee that the middle pressure steam flow all can meet the requirements of outlet steam temperature in its fluctuation range, be provided with first gas proportioning damper 8 and second gas proportioning damper 9 under the arbitrary load of boiler in 50% load～100% load range.When boiler load changes, when flue-gas temperature changes and during the middle pressure steam changes in flow rate, by regulating the aperture of gas proportioning damper, the flow through flue gas flow of external steam heater heating surface of adjusting, thereby regulate the caloric receptivity of external steam heater heating surface, reach the purpose of control external steam heater outlet temperature.Because when the gas proportioning damper aperture changes, the exhaust gas volumn of the preceding flue 3 interior economizers of the afterbody of flowing through is respective change also, influence the caloric receptivity of economizer, thus the influence of superheated steam steam temperature is regulated by the two-stage direct-contact desuperheater of superheated steam system configuration, guaranteed that the steam temperature of superheated steam outlet also reaches nominal parameter.
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the flue 3 before the afterbody, and boiler superheater is arranged on the top of economizer; Arranged external steam heater heating surface in the afterbody rear pass 4, the bottom of external steam heater heating surface is equipped with economizer.Namely first heating surface 6 is made up of low temperature superheater and first economizer, and second heating surface 7 is made up of external steam heater heating surface and second economizer.Other are identical with embodiment 1.
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the flue 3 before the afterbody; Arranged external steam heater heating surface in the afterbody rear pass 4, the bottom of external steam heater heating surface is equipped with economizer.Namely first heating surface 6 is separately first economizer, and second heating surface 7 is made up of external steam heater heating surface and second economizer.Other are identical with embodiment 1.
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the flue 3 before the afterbody, and boiler superheater is arranged on the top of economizer; Arranged external steam heater heating surface in the afterbody rear pass 4.Namely first heating surface 6 is made up of low temperature superheater and first economizer, and second heating surface 7 is external steam heater heating surface separately.Other are identical with embodiment 1.
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the afterbody rear pass 4, and boiler superheater is arranged on the top of economizer; Arranged external steam heater heating surface in the flue 3 before the afterbody, the bottom of external steam heater heating surface is equipped with economizer.Namely second heating surface 7 is made up of low temperature superheater and second economizer, and first heating surface 6 is made up of external steam heater heating surface and first economizer.Other are identical with embodiment 1.
Embodiment 6
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the afterbody rear pass 4; Arranged external steam heater heating surface in the flue 3 before the afterbody.Namely second heating surface 7 is separately second economizer, and first heating surface 6 is external steam heater heating surface separately.Other are identical with embodiment 1.
Embodiment 7
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the afterbody rear pass 4; Arranged external steam heater heating surface in the flue 3 before the afterbody, the bottom of external steam heater heating surface is equipped with economizer.Namely second heating surface 7 is separately second economizer, and first heating surface 6 is made up of external steam heater heating surface and first economizer.Other are identical with embodiment 1.
The utility model is a kind of boiler of establishing the external steam heater, has arranged economizer in the afterbody rear pass 4, and boiler superheater is arranged on the top of economizer; Arranged external steam heater heating surface in the flue 3 before the afterbody.Namely second heating surface 7 is made up of low temperature superheater and second economizer, and first heating surface 6 is external steam heater heating surface separately.Other are identical with embodiment 1.
Claims (3)
1. boiler of establishing the external steam heater, comprise burner hearth (1), burner hearth (1) is connected with back-end ductwork (2), the mid portion of back-end ductwork (2) is divided into the preceding flue (3) of afterbody and afterbody rear pass (4) by partition wall (5), be provided with first heating surface (6) in the flue (3) before the afterbody, be provided with first gas proportioning damper (8) below first heating surface (6), be provided with second heating surface (7) in the afterbody rear pass (4), be provided with second gas proportioning damper (9) below second heating surface (7), it is characterized in that, external steam heater heating surface only is located in first heating surface (6) or second heating surface (7), the external steam heater comprises external steam heater inlet header case (13) and external steam heater outlet collection case (14), and external steam heater inlet header case (13) is connected with the two ends of external steam heater heating surface respectively with external steam heater outlet collection case (14).
2. a kind of boiler of establishing the external steam heater as claimed in claim 1, it is characterized in that, described first heating surface (6) is separately external steam heater heating surface or is made up of external steam heater heating surface and first economizer, and second heating surface (7) is separately second economizer or is made up of low temperature superheater and second economizer.
3. a kind of boiler of establishing the external steam heater as claimed in claim 1, it is characterized in that, described first heating surface (6) is separately first economizer or is made up of low temperature superheater and first economizer, and second heating surface (7) is separately external steam heater heating surface or is made up of external steam heater heating surface and second economizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320090069 CN203147737U (en) | 2013-02-27 | 2013-02-27 | Boiler with external steam heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320090069 CN203147737U (en) | 2013-02-27 | 2013-02-27 | Boiler with external steam heater |
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| Publication Number | Publication Date |
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| CN203147737U true CN203147737U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320090069 Expired - Fee Related CN203147737U (en) | 2013-02-27 | 2013-02-27 | Boiler with external steam heater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134045A (en) * | 2013-02-27 | 2013-06-05 | 上海锅炉厂有限公司 | Furnace provided with external steam heater |
| CN103574588A (en) * | 2013-11-29 | 2014-02-12 | 哈尔滨锅炉厂有限责任公司 | Tower-type boiler capable of regulating temperature by combined utilization of secondary reheating damper regulator and smoke recirculation |
| CN104613809A (en) * | 2014-10-30 | 2015-05-13 | 上海明华电力技术工程有限公司 | Built-in flue smoke amount distributing control system of economizer |
| CN107575855A (en) * | 2017-10-10 | 2018-01-12 | 苏州海陆重工股份有限公司 | Flue gas governor motion in back-end ductwork |
-
2013
- 2013-02-27 CN CN 201320090069 patent/CN203147737U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134045A (en) * | 2013-02-27 | 2013-06-05 | 上海锅炉厂有限公司 | Furnace provided with external steam heater |
| WO2014131272A1 (en) * | 2013-02-27 | 2014-09-04 | 上海锅炉厂有限公司 | Boiler provided with external steam heater |
| CN103134045B (en) * | 2013-02-27 | 2015-02-18 | 上海锅炉厂有限公司 | Furnace provided with external steam heater |
| CN103574588A (en) * | 2013-11-29 | 2014-02-12 | 哈尔滨锅炉厂有限责任公司 | Tower-type boiler capable of regulating temperature by combined utilization of secondary reheating damper regulator and smoke recirculation |
| CN104613809A (en) * | 2014-10-30 | 2015-05-13 | 上海明华电力技术工程有限公司 | Built-in flue smoke amount distributing control system of economizer |
| CN104613809B (en) * | 2014-10-30 | 2019-01-29 | 上海明华电力技术工程有限公司 | A kind of economizer built-in chimney flue exhaust gas volumn diverter control system |
| CN107575855A (en) * | 2017-10-10 | 2018-01-12 | 苏州海陆重工股份有限公司 | Flue gas governor motion in back-end ductwork |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20160227 |