CN103134041A - Multistage waste heat recovery unit - Google Patents
Multistage waste heat recovery unit Download PDFInfo
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- CN103134041A CN103134041A CN2011103799065A CN201110379906A CN103134041A CN 103134041 A CN103134041 A CN 103134041A CN 2011103799065 A CN2011103799065 A CN 2011103799065A CN 201110379906 A CN201110379906 A CN 201110379906A CN 103134041 A CN103134041 A CN 103134041A
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Abstract
A multistage waste heat recovery unit is characterized in that a double-stage or the multistage waste heat recovery unit is arranged in a flue, and the multistage waste heat recovery unit comprises a multistage heat exchanger body, connecting pipelines and a by-pass wall temperature control system. The multistage waste heat recovery unit can perform gradated and gradual temperature dropping and cooling for flue gas, and effectively recover flue gas waste heat in a boiler. Due to the multistage temperature dropping, devices in the flue between the waste heat recovery units are prevented from low temperature corrosion. Meanwhile, the multistage waste heat recovery unit can be used for different purposes.
Description
Technical field
The present invention relates to heat recovery field, the multi-stage waste heat recovery device of especially a kind of station boiler, Industrial Boiler.
Background technology
At present, flue gas is the main path of general energy consumption equipment waste energy, and such as boiler exhaust gas consumes energy greatly about 15%, and other equipment are such as the main power consumption of forming machine, dryer and the kiln etc. of dyeing is all to pass through fume emission.
In society, energy-conservation " the 5th energy " that has become after coal, electric power, oil and natural gas.And ubiquity under heat utilization ratio in the use of present Industrial Boiler, residual heat of exhaust flue gas excess Temperature, and the problem such as flue gas internal contamination environmental gas too high levels.Industrial Boiler is the main thermal power equipment of China at present, and along with I cross rapid economic development, energy resource consumption increases day by day, and the problem that urban air quality goes from bad to worse is outstanding all the more.
Thermal power aspect energy consumption is high, the high one of the main reasons of pollution is exactly the fume emission of boiler, and the boiler exhaust gas problem is the direct pollution of flue gas pollutant on the one hand, is exactly too high exhaust gas temperature on the other hand.
Over past ten years, due to energy shortage, along with further carrying out of energy conservation.The advanced boiler of various novel energy-conservings is gradually improved.
Adopt advanced burner to strengthen burning, reduced the imperfect combustion amount.Yet, reduce the technology of exhaust gas temperature loss and Mist heat recovering and still make progress unhappy.In order further to improve the thermal efficiency of boiler, reach energy-saving and cost-reducing purpose, Mist heat recovering is also an energy saving way always.
Flue gas waste heat recovery is mainly to convert utilizable heat to by the heat that certain heat exchange mode carries flue gas.Set up smoke gas afterheat heat exchanger, take full advantage of flue gas and advance the common recognition that waste heat before the absorption tower has become the domestic and international expert of power system, and existing many successful experiences.
The approach of flue gas waste heat recovery adopts two kinds of methods usually: a kind of is pre-heated work pieces; Two kinds to be that preheated air carries out combustion-supporting.
Pre-heated work pieces need take larger volume and carry out heat exchange, often is subject to the restriction of Active workings.
And the place that domestic power plant can use is day by day in short supply, and the fume waste heat exchange device of single-stage is because bulky, manufacturing difficulty, difficult installation and transportation, be subject to the restriction in power plant place, and the waste-heat recovery device of bulky is also not satisfactory to the protection effect of cold end corrosion.
Summary of the invention
[0003] in order to overcome the shortcoming of above-mentioned prior art, for this reason, one object of the present invention is to propose that a kind of single-stage bulk volume is little, multistage multiduty waste-heat recovery device, and classification is successively lowered the temperature to flue gas.At first before deduster, air-introduced machine, flue gas is lowered the temperature for the first time, control cigarette temperature prevents the equipment cold end corrosion more than remaining on acid dew point.Before chimney, flue gas is lowered the temperature for the second time, fume afterheat is effectively reclaimed.This device has overcome the drawback of traditional waste heat recovery apparatus, adopts the multilevel device running, and more effectively the recovery boiler smoke discharging residual heat, protect the equipment in flue not to be subject to cold end corrosion, improves boiler efficiency remarkable.
To achieve these goals, patent scheme of the present invention is achieved in that
A kind of multi-stage waste heat recovery device is characterized in that being provided with twin-stage or multi-stage waste heat recovery device in flue, described multi-stage waste heat recovery device comprises multi-stage heat exchanger body, connecting line and bypass wall temperature control system.
Described multi-stage waste heat recovery device comprises one-level afterheat heat exchanger, secondary afterheat heat exchanger, variable frequency pump, condensate water entrance, condensate water outlet, bypass wall temperature control system and deduster, described one-level afterheat heat exchanger is arranged on after economizer before deduster, before the secondary afterheat heat exchanger is arranged on chimney, variable frequency pump can be controlled the water yield automatically according to the cigarette temperature, makes the water temperature of condensate water outlet reach the designing requirement value; Condensate water entrance and condensate water outlet are respectively condensed water water inlet and water side; The bypass wall temperature control system can be controlled the temperature of water inlet condensate water entrance automatically, makes tube wall temperature reach design load, prevents cold end corrosion, guarantees safe and reliable operation.
Described deduster is arranged between one-level afterheat heat exchanger and secondary afterheat heat exchanger.
Be provided with air-introduced machine between described deduster and one-level afterheat heat exchanger.
Described one-level afterheat heat exchanger is connected with desulfurizing tower.
The invention has the beneficial effects as follows:
The present invention can carry out gradation cooling down progressively to flue gas, effectively the recovery boiler fume afterheat.Because minute Multi-stage cooling, between waste-heat recovery device, the equipment in flue is not subjected to cold end corrosion so can protect.Waste-heat recovery devices at different levels can also act on various uses simultaneously.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is operation principle schematic diagram of the present invention.
In figure: 1 be the one-level afterheat heat exchanger, 2 for the secondary afterheat heat exchanger, 3 for flue gas, 4 for variable frequency pump, 5 for the condensate water entrance, 6 for condensate water outlet, 7 for the bypass wall temperature control system, 8 for deduster, 9 for air-introduced machine, 10 be desulfurizing tower.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As Fig. 1 to 2, a kind of multi-stage waste heat recovery device is characterized in that being provided with twin-stage or multi-stage waste heat recovery device in flue, and described multi-stage waste heat recovery device comprises multi-stage heat exchanger body, connecting line and bypass wall temperature control system.
Multi-stage waste heat recovery device comprises one-level afterheat heat exchanger 1, secondary afterheat heat exchanger 2, variable frequency pump 4, condensate water entrance 5, condensate water outlet 6, bypass wall temperature control system 7 and deduster 8, described one-level afterheat heat exchanger 1 is arranged on after economizer before deduster 8, before secondary afterheat heat exchanger 2 is arranged on chimney, variable frequency pump 4 can be controlled the water yield automatically according to the cigarette temperature, makes the water temperature of condensate water outlet 6 reach the designing requirement value; Condensate water entrance 5 and condensate water outlet 6 are respectively condensed water water inlet and water side; Bypass wall temperature control system 7 can be controlled the temperature of water inlet condensate water entrance 5 automatically, makes tube wall temperature reach design load, prevents cold end corrosion, guarantees safe and reliable operation.
Deduster 8 is arranged between one-level afterheat heat exchanger 1 and secondary afterheat heat exchanger 2.
Be provided with air-introduced machine 9 between deduster 8 and one-level afterheat heat exchanger 1.
One-level afterheat heat exchanger 1 is connected with desulfurizing tower 10.
The trend of flue gas 3 enters Fig. 2, when normal operation, when smoke gas afterheat heat exchanger condensate water entrance 5 temperature during lower than 90 ℃, bypass wall temperature control system 7 is opened automatically, the condensate return part that smoke gas afterheat heat exchanger condensate water outlet 6 place's temperature are higher is to smoke gas afterheat heat exchanger condensate water porch 5, improves condensing water inlet place 5 temperature and reaches design load.
When start operating performance, bypass wall temperature control system 7 is opened, variable frequency pump 4 low cruises, system warm-up soaking condition.
When designing into the cigarette temperature, exceed the regulating power of bypass wall temperature control system 7 when the cigarette temperature, cut off the condensate water terminal valve this moment, and flue gas heat-exchange units at different levels stop to the heat regenerative system heat supply.The self-loopa of heat exchanger system low speed prevents dry combustion method.
When system was in underrun, frequency conversion tank was controlled variable frequency pump 4 low cruises, when guaranteeing that condensate water can be heated to the designing requirement value in pipeline, reduced system's power consumption.
Bypass wall temperature control system 7 can effectively guarantee under various operating modes, more than flue gas heat-exchange units at different levels all can operate in design temperature, and the occurrent cold operation state of getting off quickly, guarantee to the full extent security of system.
Embodiment recited above is described the preferred embodiment of the present invention; be not that the spirit and scope of the present invention are limited; do not breaking away under design concept prerequisite of the present invention; various modification and improvement that in this area, common engineers and technicians make technical scheme of the present invention; all should fall into protection scope of the present invention, the technology contents that the present invention asks for protection all is documented in claims.
Claims (5)
1. a multi-stage waste heat recovery device, is characterized in that being provided with twin-stage or multi-stage waste heat recovery device in flue, and described multi-stage waste heat recovery device comprises multi-stage heat exchanger body, connecting line and bypass wall temperature control system.
2. multi-stage waste heat recovery device according to claim 1, it is characterized in that described multi-stage waste heat recovery device comprises one-level afterheat heat exchanger (1), secondary afterheat heat exchanger (2), variable frequency pump (4), condensate water entrance (5), condensate water outlet (6), bypass wall temperature control system (7) and deduster (8), after described one-level afterheat heat exchanger (1) is arranged on economizer, deduster (8) before, before secondary afterheat heat exchanger (2) is arranged on chimney, variable frequency pump (4) can be controlled the water yield automatically according to the cigarette temperature, make the water temperature of condensate water outlet (6) reach the designing requirement value, condensate water entrance (5) and condensate water outlet (6) are respectively condensed water water inlet and water side, bypass wall temperature control system (7) can be controlled the temperature of water inlet condensate water entrance (5) automatically, makes tube wall temperature reach design load, prevents cold end corrosion, guarantees safe and reliable operation.
3. multi-stage waste heat recovery device according to claim 1, is characterized in that described deduster (8) is arranged between one-level afterheat heat exchanger (1) and secondary afterheat heat exchanger (2).
4. multi-stage waste heat recovery device according to claim 1, is characterized in that being provided with air-introduced machine (9) between described deduster (8) and one-level afterheat heat exchanger (1).
5. multi-stage waste heat recovery device according to claim 1, is characterized in that described one-level afterheat heat exchanger (1) is connected with desulfurizing tower (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103799065A CN103134041A (en) | 2011-11-25 | 2011-11-25 | Multistage waste heat recovery unit |
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| CN2011103799065A CN103134041A (en) | 2011-11-25 | 2011-11-25 | Multistage waste heat recovery unit |
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| CN103134041A true CN103134041A (en) | 2013-06-05 |
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| CN2011103799065A Pending CN103134041A (en) | 2011-11-25 | 2011-11-25 | Multistage waste heat recovery unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104214783A (en) * | 2014-09-19 | 2014-12-17 | 王惠生 | Constant-temperature smoke exhaust control method and device in incineration process |
| CN106765259A (en) * | 2016-11-23 | 2017-05-31 | 广东东燃热能科技有限公司 | A kind of method of boiler residual heat recovery energy-saving |
| CN108873963A (en) * | 2017-05-08 | 2018-11-23 | 南京国能环保工程有限公司 | A kind of fume afterheat system-specific temperature data acquisition analysis system |
| CN113720177A (en) * | 2021-10-11 | 2021-11-30 | 茂名市茂南奥邦涂料有限公司 | Drying box low-temperature waste heat recovery system |
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| JP2001208302A (en) * | 2000-01-28 | 2001-08-03 | Kawasaki Thermal Engineering Co Ltd | Condensation type economizer for oxygen burning boiler |
| CN102042581A (en) * | 2011-01-21 | 2011-05-04 | 上海康洪精密机械有限公司 | System for generating low-pressure steam by utilizing flue gas waste heat |
| CN201903045U (en) * | 2010-11-08 | 2011-07-20 | 深圳中兴节能环保股份有限公司 | Residual-heat utilization device for tail flue gas of boiler |
| CN102213438A (en) * | 2010-04-08 | 2011-10-12 | 华润电力投资有限公司 | Smoke exhaust system for realizing energy conservation by using coal-fired boiler flue-gas waste heat recovery and water conservation by using wet desulphurization |
| CN202328164U (en) * | 2011-11-25 | 2012-07-11 | 江苏海德节能科技有限公司 | Multi-grade waste heat recovery device |
-
2011
- 2011-11-25 CN CN2011103799065A patent/CN103134041A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001208302A (en) * | 2000-01-28 | 2001-08-03 | Kawasaki Thermal Engineering Co Ltd | Condensation type economizer for oxygen burning boiler |
| CN102213438A (en) * | 2010-04-08 | 2011-10-12 | 华润电力投资有限公司 | Smoke exhaust system for realizing energy conservation by using coal-fired boiler flue-gas waste heat recovery and water conservation by using wet desulphurization |
| CN201903045U (en) * | 2010-11-08 | 2011-07-20 | 深圳中兴节能环保股份有限公司 | Residual-heat utilization device for tail flue gas of boiler |
| CN102042581A (en) * | 2011-01-21 | 2011-05-04 | 上海康洪精密机械有限公司 | System for generating low-pressure steam by utilizing flue gas waste heat |
| CN202328164U (en) * | 2011-11-25 | 2012-07-11 | 江苏海德节能科技有限公司 | Multi-grade waste heat recovery device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104214783A (en) * | 2014-09-19 | 2014-12-17 | 王惠生 | Constant-temperature smoke exhaust control method and device in incineration process |
| CN104214783B (en) * | 2014-09-19 | 2017-06-20 | 王惠生 | Constant temperature smoke evacuation control method and device in a kind of burning process |
| CN106765259A (en) * | 2016-11-23 | 2017-05-31 | 广东东燃热能科技有限公司 | A kind of method of boiler residual heat recovery energy-saving |
| CN108873963A (en) * | 2017-05-08 | 2018-11-23 | 南京国能环保工程有限公司 | A kind of fume afterheat system-specific temperature data acquisition analysis system |
| CN113720177A (en) * | 2021-10-11 | 2021-11-30 | 茂名市茂南奥邦涂料有限公司 | Drying box low-temperature waste heat recovery system |
| CN113720177B (en) * | 2021-10-11 | 2024-02-09 | 茂名市茂南奥邦涂料有限公司 | Stoving case low temperature waste heat recovery system |
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Application publication date: 20130605 |