CN104976607A - Boiler smoke-exhaustion waste heat recycling system additionally provided with heat exchange elements - Google Patents

Boiler smoke-exhaustion waste heat recycling system additionally provided with heat exchange elements Download PDF

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Publication number
CN104976607A
CN104976607A CN201510344984.XA CN201510344984A CN104976607A CN 104976607 A CN104976607 A CN 104976607A CN 201510344984 A CN201510344984 A CN 201510344984A CN 104976607 A CN104976607 A CN 104976607A
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China
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heat exchange
heat
exchanging component
gas
outlet
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CN104976607B (en
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张国柱
刘继平
李本锋
邢秦安
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Datang Scientific And Technological Industry Group Co ltd
Datang Beijing Energy Management Co Ltd
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Datang Scientific And Technological Industry Group Co ltd
Datang Beijing Energy Management Co Ltd
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Abstract

The invention discloses a boiler smoke-exhaustion waste heat recycling system. The boiler smoke-exhaustion waste heat recycling system comprises a low-temperature coal economizer, an inlet heat exchange assembly and an outlet heat exchange assembly, wherein the inlet heat exchange assembly is mounted between the low-temperature coal economizer and an inlet flue; the outlet heat exchange assembly is mounted between the low-temperature coal economizer and an outlet flue; and the inlet heat exchange assembly and the outlet heat exchange assembly are in the shapes of variable sections, and are distributed with a plurality of membrane type heat exchange elements on inner side walls. According to the boiler smoke-exhaustion waste heat recycling system, an inner working space is effectively utilized, the smoke gas side resistance of the low-temperature coal economizer is reduced, the heat exchange area is increased, and the system investment and the operation cost are reduced.

Description

A kind of boiler exhaust gas residual neat recovering system setting up heat exchange element
Technical field
The present invention relates to a kind of boiler exhaust gas residual neat recovering system, particularly a kind of boiler exhaust gas residual neat recovering system installing membrane type heat exchange element additional.
Background technology
Heat loss due to exhaust gas is the main heat loss of power plant boiler.Modern Large-scale fire-electricity unit boiler design smoke evacuation temperature is about about 120 DEG C, and corresponding heat loss due to exhaust gas accounts for about 5% of boiler oil thermal discharge.Exhaust gas temperature raises, and its heat loss due to exhaust gas also increases, and not only wastes energy, and desulphurization system water consumption also can be made to increase.For improving the performance driving economy of power plant, the low-level (stack-gas) economizer technology of boiler exhaust gas waste-heat condensate water is utilized to be widely used at China's Thermal Power Enterprises in recent years.Because the fume side coefficient of heat transfer is little, low-level (stack-gas) economizer volume in boiler exhaust gas residual neat recovering system is usually huge, for ensureing heat exchange amount, reducing smoke flow resistance loss, the low-level (stack-gas) economizer width for boiler exhaust gas residual neat recovering system is generally greater than flue width; On the one hand, due to site space restriction, the variable cross-section coupling part length of low-level (stack-gas) economizer and flue is less, because the abrupt change of cross-section makes flow resistance increase; On the other hand, be not provided with heat exchange element in variable cross-section part, the waste of low-level (stack-gas) economizer internal working volume can be caused.
How effectively utilizing working space, reducing the fume side resistance of low-level (stack-gas) economizer is the matter of utmost importance that the needs reducing system investments and operating cost solve.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes to install membrane type heat exchange element in the variable cross-section junction, both sides of low-level (stack-gas) economizer and flue, can make full use of working space and reduce the resistance of variable cross-section flue, thus the investment of reduction system and operating cost.
For achieving the above object, the present invention takes following design:
A kind of boiler exhaust gas residual neat recovering system, comprise low-level (stack-gas) economizer, entrance heat-exchanging component, outlet heat-exchanging component, it is characterized in that: low-level (stack-gas) economizer width is greater than gas approach and exhaust pass width, entrance heat-exchanging component is installed between low-level (stack-gas) economizer and gas approach, outlet heat-exchanging component is installed between low-level (stack-gas) economizer and exhaust pass, entrance heat-exchanging component and outlet heat-exchanging component are variable cross-section shape, its madial wall is arranged some membrane type heat exchange elements, outlet heat-exchanging component is provided with condensate water import, entrance heat-exchanging component is provided with condensate water outlet.
Further, the steel plate that membrane type heat exchange element is fixedly connected with on heat exchanger tube by heat exchanger tube is formed.
Further, at entrance heat-exchanging component and outlet heat-exchanging component place, its madial wall installs membrane type heat exchange element radially; The steel plate of membrane type heat exchange element is perpendicular to heat-exchanging component madial wall, and the long limit of steel plate is fixedly connected with madial wall.
Further, membrane type heat exchange element is made up of the vertical steel plate of 36-90 sheet; Angle between each steel plate is taken as 4 °-10 °.
Advantage of the present invention is: effectively utilize space, reduce the fume side resistance of low-level (stack-gas) economizer, increase heat exchange area, reduce system investments and operating cost.
Accompanying drawing explanation
The system architecture schematic diagram that Fig. 1 is.
Fig. 2 is membrane type heat exchange element structure chart.
Fig. 3 is membrane type heat exchange element layout drawing.
1. outlet heat-exchanging component, 2. low-level (stack-gas) economizer, 3. entrance heat-exchanging components in figure, 4. condensate water import, 5. condensate water outlet, 6. gas approach, 7. exhaust pass, 8. heat exchanger tube, 9. steel plate
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail, should be appreciated that content described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
As shown in Figure 1, low-level (stack-gas) economizer 2 width is generally greater than flue width, entrance heat-exchanging component 3 can be respectively arranged with and export heat-exchanging component 1 between low-level (stack-gas) economizer 2 and gas approach 6, exhaust pass 7, entrance heat-exchanging component 3 and outlet heat-exchanging component 1 are variable cross-section shape, its madial wall are arranged some membrane type heat exchange elements.Outlet heat-exchanging component 1 is provided with condensate water import 4, entrance heat-exchanging component 3 is provided with condensate water outlet 5.
At entrance heat-exchanging component 3 and outlet heat-exchanging component 1 place, connect flue and low-level (stack-gas) economizer, low-level (stack-gas) economizer width is generally greater than flue width, and flue gas flow field disturbance herein can be caused strong, and its coefficient of heat transfer is larger.Arrange heat exchanger tube herein, desirable good heat transfer effect.
Condensate water enters from condensate water import 4, after flowing through outlet heat-exchanging component 1, low-level (stack-gas) economizer 2 and entrance heat-exchanging component 3 successively, flows out from condensate water outlet 5.
As shown in Figure 2, the steel plate 9 that membrane type heat exchange element is fixedly connected with on heat exchanger tube by heat exchanger tube 8 is formed, steel plate is rectangle, the a series of membrane type heat exchange element composition deflectors installed in the heat-exchanging component of both sides, the flue gas flow field that can realize making to enter and flow out low-level (stack-gas) economizer is even, the loss of reduction flow of flue gas, can be used as heat exchange unit again simultaneously, thus increase heat exchange area, reduce investment and operating cost.
As shown in Figure 3, at entrance heat-exchanging component 3 and outlet heat-exchanging component 1 place, its madial wall installs membrane type heat exchange element radially, is made up of the vertical steel plate 9 of 36-90 sheet; Steel plate is perpendicular to heat-exchanging component madial wall, and the long limit of steel plate is fixedly connected with madial wall, thus forms guide functions by steel plain to inner flue gas flow field.For avoiding occurring boundary layer separation, effectively reduce resistance, the angle between each steel plate should be too not large, and the requirement can arranged according to space is taken as 4 °-10 °.In order to make, flow field is more even, raising heat transfer effect, and the steel plate quantity adopted in the present invention can be greater than water conservancy diversion actual requirement, and its arrangement is determined by method for numerical simulation.
Compared with existing boiler exhaust gas residual neat recovering system, advantage of the present invention is:
(1) fully space can be utilized by flue;
(2) cost of flue gas waste heat recovery system is reduced;
(3) system is simple, easily implements.
Last it is noted that the foregoing is only explanation of the present invention, be not limited to the present invention, although to invention has been detailed description, for a person skilled in the art, it still can be modified to aforementioned described technical scheme, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. a boiler exhaust gas residual neat recovering system, comprise low-level (stack-gas) economizer, entrance heat-exchanging component, outlet heat-exchanging component, it is characterized in that: low-level (stack-gas) economizer width is greater than gas approach and exhaust pass width, entrance heat-exchanging component is installed between low-level (stack-gas) economizer and gas approach, outlet heat-exchanging component is installed between low-level (stack-gas) economizer and exhaust pass, entrance heat-exchanging component and outlet heat-exchanging component are variable cross-section shape, its madial wall is arranged some membrane type heat exchange elements, outlet heat-exchanging component is provided with condensate water import, entrance heat-exchanging component is provided with condensate water outlet.
2. boiler exhaust gas residual neat recovering system according to claim 1, is characterized in that: the steel plate that membrane type heat exchange element is fixedly connected with on heat exchanger tube by heat exchanger tube is formed.
3. boiler exhaust gas residual neat recovering system according to claim 1, is characterized in that: at entrance heat-exchanging component and outlet heat-exchanging component place, its madial wall installs membrane type heat exchange element radially; The steel plate of membrane type heat exchange element is perpendicular to heat-exchanging component madial wall, and the long limit of steel plate is fixedly connected with madial wall.
4. boiler exhaust gas residual neat recovering system according to claim 3, is characterized in that: membrane type heat exchange element is made up of the vertical steel plate of 36-90 sheet; Angle between each steel plate is taken as 4 °-10 °.
CN201510344984.XA 2015-06-17 2015-06-17 A kind of boiler exhaust gas residual neat recovering system for adding heat exchange element Active CN104976607B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107702084A (en) * 2017-11-06 2018-02-16 江阴德耐特重工科技有限公司 A kind of power plant's low-level (stack-gas) economizer

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB206445A (en) * 1922-08-05 1923-11-05 Power Specialty Co Improvements in and relating to fuel economizers and like apparatus for effecting transfer of heat
US4138969A (en) * 1977-07-08 1979-02-13 Applied Engineering Co. Heat exchanger and economizer
CN201507915U (en) * 2009-10-15 2010-06-16 张士宽 Economizer for ordinary-pressure heat pipe
CN202253564U (en) * 2011-10-17 2012-05-30 岳阳金瀚高新技术有限责任公司 Waste heat recovery device of small-sized boiler
CN203336568U (en) * 2012-11-12 2013-12-11 同济大学 Plate-type economizer
CN103604113A (en) * 2013-11-21 2014-02-26 中国电力工程顾问集团中南电力设计院 Novel tube panel type water tube heat exchanger integrated with electrostatic precipitator
US20140262257A1 (en) * 2013-03-14 2014-09-18 Babcock & Wilcox Power Generation Group, Inc. Small supercritical once-thru steam generator
CN204901726U (en) * 2015-06-17 2015-12-23 大唐(北京)能源管理有限公司 Boiler of addding heat transfer component waste heat recovery system of discharging fume

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB206445A (en) * 1922-08-05 1923-11-05 Power Specialty Co Improvements in and relating to fuel economizers and like apparatus for effecting transfer of heat
US4138969A (en) * 1977-07-08 1979-02-13 Applied Engineering Co. Heat exchanger and economizer
CN201507915U (en) * 2009-10-15 2010-06-16 张士宽 Economizer for ordinary-pressure heat pipe
CN202253564U (en) * 2011-10-17 2012-05-30 岳阳金瀚高新技术有限责任公司 Waste heat recovery device of small-sized boiler
CN203336568U (en) * 2012-11-12 2013-12-11 同济大学 Plate-type economizer
US20140262257A1 (en) * 2013-03-14 2014-09-18 Babcock & Wilcox Power Generation Group, Inc. Small supercritical once-thru steam generator
CN103604113A (en) * 2013-11-21 2014-02-26 中国电力工程顾问集团中南电力设计院 Novel tube panel type water tube heat exchanger integrated with electrostatic precipitator
CN204901726U (en) * 2015-06-17 2015-12-23 大唐(北京)能源管理有限公司 Boiler of addding heat transfer component waste heat recovery system of discharging fume

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107702084A (en) * 2017-11-06 2018-02-16 江阴德耐特重工科技有限公司 A kind of power plant's low-level (stack-gas) economizer
CN107702084B (en) * 2017-11-06 2022-12-20 江阴德耐特重工科技有限公司 Low-temperature economizer of power plant

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