CN204201871U - A kind of boiler exhaust gas residual neat recovering system - Google Patents
A kind of boiler exhaust gas residual neat recovering system Download PDFInfo
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- CN204201871U CN204201871U CN201420597117.8U CN201420597117U CN204201871U CN 204201871 U CN204201871 U CN 204201871U CN 201420597117 U CN201420597117 U CN 201420597117U CN 204201871 U CN204201871 U CN 204201871U
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Abstract
A kind of boiler exhaust gas residual neat recovering system, the utility model is the problem in order to solve existing power plant boiler heat loss due to exhaust gas, the utility model by multicomponent from formula mixed working fluid heat exchange of heat pipe, each group of separate type mixed working fluid heat exchange of heat pipe is made up of endotherm section and heat release section, loop is connected to form by steam pipework and liquid back pipe respectively between endotherm section and heat release section, multicomponent is arranged from multiple endotherm sections of formula mixed working fluid heat exchange of heat pipe step by step at flow of flue gas side's upstream sequence, corresponding multiple heat release section is being arranged step by step by backward on heating working medium flow direction, ensure that arrangement is flexible with this, reduce flue resistance, the temperature difference between flue gas and heated medium reduces, heat-economy is good.
Description
Technical field
The utility model belongs to boiler afterheat and reclaims power-saving technology, is specifically related to a kind of power plant boiler smoke waste heat recovery system.
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, but flue gas and condensate water carry out direct heat transfer in existing low-level (stack-gas) economizer, be unfavorable for the temperature controlling heat exchanger tube surface, coefficient of heat transfer difference simultaneously due to both is comparatively large, is unfavorable for the draught control that heat-transfer surface is arranged and flowed.
Utility model content
The purpose of this utility model is the problem in order to solve existing power plant boiler heat loss due to exhaust gas, and then provides a kind of power plant boiler smoke waste heat recovery system.
The technical solution of the utility model is: a kind of boiler exhaust gas residual neat recovering system, is characterized in that, comprising: multicomponent is from formula mixed working fluid heat exchange of heat pipe; Each group of separate type mixed working fluid heat exchange of heat pipe is made up of endotherm section and heat release section; Loop is connected to form by steam pipework and liquid back pipe respectively between endotherm section and heat release section; Multicomponent is arranged from multiple endotherm sections of formula mixed working fluid heat exchange of heat pipe step by step at flow of flue gas side's upstream sequence, and corresponding multiple heat release section is being arranged step by step by backward on heating working medium flow direction.
Further, liquid back pipe is arranged auxiliary circulating pump and liquid reserve tank.Each steam pipework is installed and vacuumizes arm, vacuumize arm and be connected with vavuum pump by multiple transfer valve.Adopt 3-10 group separate type mixed working fluid heat exchange of heat pipe.
The utility model compared with prior art has following effect:
The utility model adopts the multicomponent of water and alcohol mixed working fluid from formula hot pipe technique design power plant boiler flue gas waste heat recovery system, to reduce heat transfer temperature difference, thus improve the heat transfer effect of system, control heat exchanging pipe wall temperature simultaneously, improve system cloud gray model security.
Accompanying drawing explanation
Fig. 1 boiler exhaust gas residual neat recovering system fundamental diagram;
Fig. 2 boiler exhaust gas residual neat recovering system structure chart.
Detailed description of the invention
Heat pipe is a kind of high-performance heat transfer components, has the advantages such as the coefficient of heat transfer is high, heat exchange amount is large; But conventional capillary formula heat exchange of heat pipe is using every root heat pipe as a heat exchange unit, and its endotherm section and heat release section need to arrange nearby, affect the flexibility of its system; Endotherm section and heat release section combine as a whole from formula heat pipe by conventional one pack system, and only provide the heat exchanger that one group of operating mode is identical, overpressure is consistent, and makes the heat transfer temperature difference between fume side and water side cannot reduce further, affect heat-economy; Gravity type heat pipe needs heat release section to be arranged in endotherm section top, affects the adaptability of its system; Heat exchange of heat pipe adopts single working media, and heat transfer temperature difference cannot be reduced.
The utility model has used for reference the pluses and minuses of above-mentioned heat pipe, devises a kind of boiler exhaust gas residual neat recovering system, adopts multicomponent from formula mixed working fluid heat exchange of heat pipe, and is provided with multiple auxiliary circulating pump 5 and liquid reserve tank 6.Heat transferring medium in each group of heat pipe is water and crude alcohol mixture, heat transferring medium in endotherm section by flue gas, be evaporated to steam; Enter heat release section along steam pipework and be condensed into liquid, its heat is utilized by the smoke absorption after condensate water, hot net water, preheated air or desulfurization; Liquid returns endotherm section through auxiliary circulating pump along water return pipeline, completes whole circulation.
As shown in Figure 1, top line 11 is depicted as flue gas heat release performance curve, medium line 12 is depicted as mixed working fluid suction/heat release performance curve, below line 13 is depicted as medium heat absorption performance curve, A-B interval is depicted as the 1st group of heat exchanger performance curve, B-C interval is depicted as the 2nd group of heat exchanger performance curve, C-D interval is depicted as the 3rd group of heat exchanger performance curve, owing to adopting multi-group heat exchanger, in each group of separate type mixed working fluid heat exchange of heat pipe the pressure of water-alcohol mixture and concentration different, saturation temperature corresponding to it is not identical yet, set the pressure of each group of corresponding heat transferring medium from the locus of formula mixed working fluid heat exchange of heat pipe and adjustment by reasonable Arrangement multicomponent, concentration parameter, temperature interval (i.e. heat transfer temperature difference) between flue gas exotherm and medium endotherm can obviously reduce, effectively reduce the heat transfer temperature difference between fume side and water side when multi-group heat exchanger works, improve system heat-economy, wherein owing to adopting water and alcohol mixed working fluid, more single working medium reduce even further heat transfer temperature difference.
Fig. 2 gives the system of employing 3 groups of separate type heat pipe heater recovery boiler smoke discharging residual heat heat-setting water; Flue gas after boiler exhaust gas residual neat recovering system adopts 3-10 group separate type mixed working fluid heat exchange of heat pipe recovery boiler smoke discharging residual heat to be used for heat-setting water, hot net water, preheated air or desulfurization.
Each group of separate type mixed working fluid heat exchange of heat pipe is made up of endotherm section 1 and heat release section 2, and endotherm section 1 absorbs the waste heat of flue gas, and heat release section 2 releases heat to by heating working medium; Loop is connected to form by steam pipework 3 and liquid back pipe 4 respectively between endotherm section and heat release section, liquid back pipe 4 is arranged auxiliary circulating pump 5 and liquid reserve tank 6, each steam pipework is installed and vacuumizes arm, vacuumize arm to be connected with vavuum pump 8 by multiple transfer valve 7, during vavuum pump work, come to carry out controls adjustment to the operating pressure of each group of heat exchanger respectively by controlling one of them the opening and closing of multiple transfer valve 7;
Heat transferring medium in heat exchange of heat pipe is the mixture of water and alcohol, and wherein the volume content of alcohol is between 10%-50%.Operating temperature according to each group of heat exchange of heat pipe selects alcohol by volume content concn.In heat exchanger, temperature is higher, and alcohol by volume content is larger;
Utilize auxiliary circulating pump 5, the endotherm section of each group heat exchange of heat pipe and heat release section all can overcome gravity or drag effect that heat transferring medium is subject to and adopt counter-flow arrangement.
Compared with existing boiler exhaust gas residual neat recovering system, advantage of the present utility model is:
(1) arrangement is flexible, multicomponent from and adopt auxiliary circulating pump, according to flue and by the actual conditions arrangement system of heating working medium, flue resistance can be reduced;
(2) pressure and the concentration of the heat transferring medium in each group separate type mixed working fluid heat exchange of heat pipe are different, and the temperature difference between flue gas and heated medium reduces, and heat-economy is good;
(3) by regulating the pressure in heat pipe to control endotherm section pipeline wall temperature, corrosion is prevented.
Claims (4)
1. a boiler exhaust gas residual neat recovering system, is characterized in that, comprising: multicomponent is from formula mixed working fluid heat exchange of heat pipe; Each group of separate type mixed working fluid heat exchange of heat pipe is made up of endotherm section and heat release section; Loop is connected to form by steam pipework and liquid back pipe respectively between endotherm section and heat release section; Multicomponent is arranged from multiple endotherm sections of formula mixed working fluid heat exchange of heat pipe step by step at flow of flue gas side's upstream sequence, and corresponding multiple heat release section is being arranged step by step by backward on heating working medium flow direction.
2. boiler exhaust gas residual neat recovering system as claimed in claim 1, is characterized in that, liquid back pipe is arranged auxiliary circulating pump and liquid reserve tank.
3. boiler exhaust gas residual neat recovering system as claimed in claim 1, is characterized in that, each steam pipework is installed and vacuumizes arm, vacuumize arm and be connected with vavuum pump by multiple transfer valve.
4. boiler exhaust gas residual neat recovering system as claimed in claim 1, is characterized in that, adopts 3-10 group separate type mixed working fluid heat exchange of heat pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420597117.8U CN204201871U (en) | 2014-10-02 | 2014-10-02 | A kind of boiler exhaust gas residual neat recovering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420597117.8U CN204201871U (en) | 2014-10-02 | 2014-10-02 | A kind of boiler exhaust gas residual neat recovering system |
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| CN204201871U true CN204201871U (en) | 2015-03-11 |
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| CN201420597117.8U Active CN204201871U (en) | 2014-10-02 | 2014-10-02 | A kind of boiler exhaust gas residual neat recovering system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822958A (en) * | 2019-10-17 | 2020-02-21 | 山东科技大学 | Long-distance separated heat pipe heat exchange system |
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2014
- 2014-10-02 CN CN201420597117.8U patent/CN204201871U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822958A (en) * | 2019-10-17 | 2020-02-21 | 山东科技大学 | Long-distance separated heat pipe heat exchange system |
| WO2021072965A1 (en) * | 2019-10-17 | 2021-04-22 | 山东科技大学 | Long-distance separation type heat pipe heat exchange system |
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