CN203177191U - Boiler back dedusting and flue gas waste heat recovery integrated device - Google Patents
Boiler back dedusting and flue gas waste heat recovery integrated device Download PDFInfo
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- CN203177191U CN203177191U CN2013200786231U CN201320078623U CN203177191U CN 203177191 U CN203177191 U CN 203177191U CN 2013200786231 U CN2013200786231 U CN 2013200786231U CN 201320078623 U CN201320078623 U CN 201320078623U CN 203177191 U CN203177191 U CN 203177191U
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- flue gas
- chamber
- dedusting
- waste heat
- flow equalizing
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Abstract
The utility model discloses a boiler back dedusting and flue gas waste heat recovery integrated device. The boiler back dedusting and flue gas waste heat recovery integrated device comprises a heat exchange chamber, a smoke flow equalizing chamber and an electric dedusting chamber, wherein a smoke inlet and a flow guide plate II are arranged at the lower end of the heat exchange chamber, a water-cooled heat exchanger is arranged in the middle of the heat exchange chamber, a smoke outlet and a flow guide plate I are arranged at the upper end of the heat exchange chamber, and an ash blowing device is installed on the water-cooled heat exchanger. A flow guide plate III is arranged at the front end of the smoke flow equalizing chamber, a rectification hole plate is arranged at the back end of the smoke flow equalizing chamber, and a small hanging plate is installed on the rectification hole plate. An anode system and a cathode system are arranged in the electric dedusting chamber, and a hot blowing system is arranged at the top end of the cathode system. The bottom of the heat exchange chamber, the bottom of the smoke flow equalizing chamber and the bottom of the electric dedusting chamber are respectively provided with an ash cleaning device and a steam heating tube, the heat exchange chamber is communicated with the smoke flow equalizing chamber, and the smoke flow equalizing chamber is communicated with the electric dedusting chamber. After the boiler back dedusting and flue gas waste heat recovery integrated device is used in a boiler, efficient dedusting and efficient smoke waste heat recovery can be achieved. The boiler back dedusting and smoke waste heat recovery integrated device has the advantages of being high in smoke waste heat using rate and high in dedusting efficiency, and reduces operation cost of a follow-up desulfuration process.
Description
Technical field
The utility model relates to the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler, belongs to environmental protection, energy-saving field.
Background technology
Coal-fired power plant's dust in flue gas material is an important pollutant index of regulation in " thermal power plant's atmosphere pollutants emission standards ".At present, Chinese Ministry of Environmental Protection revises GB GB13223-2003 " thermal power plant's atmosphere pollutants emission standards ", with the dust maximal emission by the 50mg/Nm that stipulates in the primary standard
3Be tightened to 30mg/Nm
3, the permission discharge value of key area especially must not be greater than 20mg/Nm
3
In " the 12 5 years (2011～2015 years) planning outline of national economy and social development ", propose important restrictive index-: " the GDP energy consumption reduces about 16%, and total emissions of major pollutants reduces 8%～10% ".This is to put forward at the outstanding problem that resource environment pressure strengthens day by day, has embodied the requirement of building resource-conserving and friendly environment society.That is to say, when considering pollutant decrement qualified discharge, should select low energy consumption, technology that efficient is high for use.
In addition, along with the continuous exploitation of high-quality electricity coal, the quality of power plant soot descends rapidly in recent years.Thereby make power plant's generating efficiency descend, the pollutant in the power-plant flue gas, especially dust-like material, concentration increases.Therefore, seek and a kind ofly can take full advantage of power plant's energy and the method and apparatus of dust removal efficiently is necessary.
The heat that power-plant flue gas is taken away is significant energy loss in power plant's running, and empirical data shows, makes 10 ℃ of the every reductions of flue-gas temperature, and the energy of recovery is equivalent to 1% of power generating capacity.If can reclaim and use in the unit this part heat and go, can contribute for country reduces index to the GDP energy consumption so, can also effectively improve the economic benefit of unit.
In the art, mainly be to adopt flue gas heat exchange device (GGH) and other heat exchanger are installed to the way of recycling of fume afterheat.But there is civil engineering cycle length in GGH, moves shortcomings such as complicated, that the equipment initial investment is big.At present, that adopts in other heat exchanger mostly is water-cooled, i.e. the heating agent that heat exchange is adopted is water, utilizes water constantly to flow in the finned tube of heat exchanger inside and absorbs heat.
Electric cleaner is because its running resistance is low, efficiency of dust collection is high, maintenance workload is few and with advantages such as automation controls, be main dust collection method and the equipment of present coal-burning power plant.But, because the electric cleaner operation principle determines, his performance be subjected to fuel (coal) and the dust properties influence bigger, and the dust characteristic is closely related with flue-gas temperature, therefore, electric cleaner is subjected to the restriction of process conditions such as flue-gas temperature, and equipment performance can not be fully played.
Dust specific resistance is 10 in the flue gas
5～10
10In the time of between the Ω .cm, electric cleaner has the highest efficiency of dust collection, when dust specific resistance increases to 10
10～10
12In the time of between the Ω .cm, back corona phenomenon in various degree can appear in electric cleaner when work, cause efficiency of dust collection to descend fast, and opposite electrisity consumption is fast rise but.Dust specific resistance is proportionate with flue-gas temperature within the specific limits, at present the electric cleaner operating temperature of coal-burning power plant generally between 120～150 ℃, this temperature range exactly dust specific resistance 10
11～10
13Zone between the Ω .cm.
Summary of the invention
The purpose of this utility model is in order to solve above-mentioned electric cleaner operating temperature between 120～150 ℃ the time, and dust specific resistance increases to 10
11～10
13Ω .cm, back corona phenomenon in various degree can appear in electric cleaner, cause efficiency of dust collection to descend fast, the technical problem that electrisity consumption fast rise and flue gas waste heat recovery cut down the consumption of energy etc. and the integrated apparatus of dedusting and flue gas waste heat recovery after a kind of boiler is provided, when the integrated apparatus of dedusting and flue gas waste heat recovery is recycled in the flue gas heat energy by water-cooled heat exchanger behind this boiler, make the operating temperature of electric cleaner drop to about 80 ℃, dust specific resistance can drop to 10
10～10
12Ω .cm, thereby the efficiency of dust collection of raising electric cleaner, thus realize the integrated of high-effective dust-removing and waste heat recovery.
The technical solution of the utility model
The integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler comprises heat-exchanging chamber, flue gas flow equalizing chamber and electric precipitation chamber;
Described heat-exchanging chamber upper end is provided with exhanst gas outlet, and exhanst gas outlet is provided with deflector I, and the lower end is provided with gas approach, and gas approach is provided with deflector II, and the middle part is provided with water-cooled heat exchanger; Described deflector I links to each other with the outlet of water-cooled heat exchanger, and described deflector II links to each other with the import of water-cooled heat exchanger;
The heat exchange area of described heat-exchanging chamber can guarantee that the temperature of exhanst gas outlet in the heat-exchanging chamber is about 80 ℃;
The heat exchange element of described water-cooled heat exchanger is the fin-like blade pipe, and water-cooled heat exchanger is provided with soot blower, and its water (flow) direction is vertical with the flow of flue gas direction;
Described flue gas flow equalizing chamber front end is provided with circular blast baffle III, and preferred 2 groups, radian is 55～75 °, and monolateral lengthening 0.5～1.0 m, and the rear end is provided with on rectification orifice plate, the rectification orifice plate and is installed with small-sized link plate;
Described rectification orifice plate is arranged vertically in the flue gas flow equalizing chamber, and rectification orifice plate aperture opening ratio is between 30～40%, and hatch bore diameter is 90mm;
Described small-sized link plate is preferably long 500mm, the square plate of wide 200mm, and spot welding is welded extremely after being bolted on the rectification orifice plate, and the hole of opening on small-sized link plate and the rectification orifice plate is staggeredly arranged;
The inside of described electric precipitation chamber is provided with anode system, cathod system, be used for capturing the dust in flue gas that enters the electric precipitation chamber, the top of cathod system is provided with hot blow and sweeps system, is used for anti-condensation, and the front end of electric precipitation chamber is provided with gas approach, end is provided with the fume emission mouth;
Soot cleaning system is arranged respectively at heat-exchanging chamber, flue gas flow equalizing chamber and bottom, electric precipitation chamber; Wherein heat-exchanging chamber by the exhanst gas outlet that the upper end is provided be connected with the flue gas flow equalizing chamber, the flue gas flow equalizing chamber is connected with the gas approach that electric precipitation chamber front end is provided with by the exhanst gas outlet that the rear end is provided with;
Top, described electric precipitation chamber is provided with hot blow and sweeps system;
Described soot cleaning system comprises ash bucket and steam-heating pipe, and steam-heating pipe is arranged on the ash bucket outer wall, and arranging of steam-heating pipe mainly is the dust that captures in the heating ash bucket, increases the flowability of ash, avoids ash bucket to stop up.
Utilize the integrated apparatus of dedusting and flue gas waste heat recovery behind above-mentioned a kind of boiler to carry out the method for dedusting and flue gas waste heat recovery behind the boiler, step is as follows:
120～150 ℃ pending flue gas enters heat-exchanging chamber from gas approach, behind the deflector II water conservancy diversion on the gas approach, carry out heat exchange with the water-cooled heat exchange, thereby the partial heat energy in the recycling flue gas, at this moment, the flue-gas temperature in the exhanst gas outlet of heat-exchanging chamber is about 80 ℃; The deflector I water conservancy diversion of flue gas in the outlet of water-cooled heat exchange on exhanst gas outlet enters the flue gas flow equalizing chamber, and flue gas evenly enters electric cleaner in the indoor rectification through deflector III and rectification orifice plate of flue gas flow equalizing by the outlet of flue gas flow equalizing chamber and carries out dedusting; Because entering the flue-gas temperature of electric cleaner reduces, the ratio resistance of its volume and dust all reduces greatly, make the efficiency of dust collection of electric cleaner be improved, the fume emission mouth of flue gas through the electric precipitation chamber that last electric cleaner comes out enters follow-up flue gas desulfur device again and proceeds the desulfurization processing, and the integrated apparatus sedimentation of dedusting and flue gas waste heat recovery behind boiler and the dust of collecting are removed by soot cleaning system.
The beneficial effects of the utility model
The integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler, flue gas is by behind the water-cooled heat exchanger, the temperature of flue gas reduces, make and to enter the volume of the flue gas in the electric precipitation chamber and the ratio resistance of dust all reduces, thereby improved the efficiency of dust collection of electric cleaner, realized the integrated of high-effective dust-removing and waste heat recovery.
Further, the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler of the present utility model, owing to utilize water-cooled heat exchanger to recycle energy in the flue gas, thus improved the capacity usage ratio of unit.
Further, the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler of the present utility model, behind water-cooled heat exchanger, because the temperature of flue gas reduces, make flue gas volume reduce 10% approximately, the booster fan power consumption reduces 9% approximately, and make-up water reduces 32% approximately in the follow-up desulfurization process, therefore also can further reduce the cost of follow-up desulfurization process.
Practical engineering application shows that also the smoke entrance temperature of water-cooled heat exchanger is if reduce by 40 ℃, and the energy of maximum recyclable utilization is equivalent to the heat of 4.8% unit generation capacity; Simultaneously, the ratio resistance of dust can reduce by 10
1～10
2The order of magnitude of Ω .cm, thus make efficiency of dust collection significantly improve; Corresponding flue gas volume also will reduce 10%.
In sum, with existing independent electric cleaner to boiler after dedusting compare, guaranteeing under the identical efficiency of dust collection condition, use the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler of the present utility model, not only can improve the efficiency of dust collection of electric cleaner, realize the integrated of high-effective dust-removing and waste heat recovery, but also can reduce the energy consumption of dedusting, reduce the operating cost of follow-up desulfurization process.
Description of drawings
The structural representation of the integrated apparatus of dedusting and flue gas waste heat recovery behind Fig. 1, a kind of boiler of the present utility model;
The section of structure of the integrated apparatus of dedusting and flue gas waste heat recovery behind Fig. 2, a kind of boiler of the present utility model.
The specific embodiment
Also by reference to the accompanying drawings the utility model is further set forth below by specific embodiment, but do not limit the utility model.
Embodiment 1
The integrated device of dedusting and flue gas waste heat recovery behind a kind of boiler, its structural representation comprise heat-exchanging chamber 1, flue gas flow equalizing chamber 2 and electric precipitation chamber 3 as shown in Figure 1 and Figure 2;
Described heat-exchanging chamber 1 upper end is provided with exhanst gas outlet, and exhanst gas outlet is provided with deflector I, lower end and is provided with that gas approach 4, gas approach 4 are provided with deflector II, the middle part is provided with water-cooled heat exchanger 5;
The heat exchange area of described water-cooled heat exchanger 5 can guarantee that the temperature of exhanst gas outlet in the heat-exchanging chamber 1 is about 80 ℃;
The heat exchange element of described water-cooled heat exchanger 5 is the fin-like blade pipe, and water-cooled heat exchanger 5 is provided with soot blower 6, and the water (flow) direction in the water-cooled heat exchanger 5 is vertical with the flow of flue gas direction;
Flue gas flow equalizing chamber 2 front ends are provided with 2 groups of circular blast baffle III, and radian is 55～75 °, and monolateral lengthening 0.5～1.0m, and the rear end is provided with and is installed with small-sized link plate 8 on rectification orifice plate 7, the rectification orifice plate 7;
Described rectification orifice plate 7 is arranged vertically in flue gas flow equalizing chamber 2, and rectification orifice plate 7 aperture opening ratios are 36%, and hatch bore diameter is 90mm;
Described small-sized link plate 8 is long 500mm, the square plate of wide 200mm, and spot welding is welded extremely after being bolted on the rectification orifice plate 7, and the hole of opening on small-sized link plate 8 and the rectification orifice plate is staggeredly arranged;
Heat-exchanging chamber 1, flue gas flow equalizing chamber 2 and 3 bottoms, electric precipitation chamber are respectively equipped with soot cleaning system;
Described soot cleaning system comprises ash bucket 13 and the steam-heating pipe 14 that is arranged on ash bucket 13 outer walls;
Heat-exchanging chamber 1 by the exhanst gas outlet that the upper end is provided be connected with flue gas flow equalizing chamber 2, flue gas flow equalizing chamber 2 is connected with the gas approach of electric precipitation chamber 3 front ends by the exhanst gas outlet that the rear end is provided with.
Application Example 1
Use the integrated apparatus of dedusting and flue gas waste heat recovery behind embodiment 1 described a kind of boiler, the flue gas behind the Shanghai 3MW pilot scale boiler is carried out dedusting and fume afterheat reclaims, concrete steps are as follows:
The pending temperature that air preheater comes out behind the boiler is that the gas approach 4 of 120 ℃ the flue gas integrated apparatus of dedusting and flue gas waste heat recovery behind the boiler enters heat-exchanging chamber 1, behind the deflector I water conservancy diversion on the gas approach, carry out heat exchange with water-cooled heat exchanger 5, thereby the partial heat energy in the recycling flue gas, at this moment, the flue-gas temperature of water-cooled heat exchanger 5 outlet is at 80 ℃, is deposited in the flue gas on the water-cooled heat exchanger 5 the part dust and purged to the soot cleaning system of water-cooled heat exchanger 5 bottoms by heat-exchanging chamber 1 bottom by soot blower 6 and be eliminated;
The flue gas that is cooled to 80 ℃ enters flue gas flow equalizing chamber 2 behind the deflector II water conservancy diversion on the exhanst gas outlet 4 on heat-exchanging chamber 1 top, flue gas evenly enters electric precipitation chamber 3 through the rectification of deflector III and rectification orifice plate 7 by the outlet of flue gas flow equalizing chamber in flue gas flow equalizing chamber 2, the soot cleaning system removal that sedimentations and the dust collected arrange by its bottom in the flue gas flow equalizing chamber 2;
The anode system 9 that electric precipitation chamber 3 is provided with and cathod system 10 are used for capturing the dust in flue gas that enters the electric precipitation chamber, the dust of collecting in the electric precipitation chamber 3 is removed by the soot cleaning system that its bottom arranges, cathod system 10 is equipped with hot blow sweeps system 11, prevent the dewfall phenomenon, because the flue-gas temperature that enters in the dirt pocket 3 reduces, the ratio resistance of the volume of flue gas and dust all reduces greatly, make the efficiency of dust collection of electric precipitation chamber 3 be improved, the fume emission mouth 12 of flue gas through electric precipitation chamber 3 that comes out in last electric precipitation chamber 3 enters follow-up desulfurizer and carries out the desulfurization processing.
Final result shows: flue gas is after the integrated apparatus of dedusting and flue gas waste heat recovery behind above-mentioned a kind of boiler is handled, and the flue-gas temperature that air preheater comes out is reduced in 80 ℃ the process by original 120 ℃, and the ratio resistance of dust is by original 10 in the flue gas
11Ω .cm is reduced to 10
10Ω .cm, exhaust gas volumn is by 6378 m3/h(hygrometric states) drop to 5729 m3/h(hygrometric states), dust concentration is by the 7.25g/Nm3(dry state) be reduced to 18.2 mg/Nm3(dry states), final efficiency of dust collection is 99.75%, about 478MJ/h recovers energy.
Comparative examples
Flue gas after using independent electric cleaner technology to this pilot scale boiler carries out dedusting, and concrete steps are as follows:
The pending temperature that air preheater comes out behind the boiler is that 120 ℃ flue gas is from directly entering electric precipitation chamber 3.Final result shows: dust concentration is by the 7.25g/Nm3(dry state after independent electric cleaner 3 is handled) be reduced to 42 mg/Nm3(dry states), efficiency of dust collection is about 99.42%.
In sum, the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler of the present utility model, the smoke entrance temperature of water-cooled heat exchanger is if reduce by 40 ℃, and the heat of maximum recyclable utilization is equivalent to the energy of 4.8% unit generation amount;
Simultaneously, the ratio resistance that enters the dust in flue gas of electric precipitation chamber on inspection can reduce by 10
1The order of magnitude of Ω .cm, thus make efficiency of dust collection improve 0.33%;
Further, because that corresponding flue gas volume reduces is about 10%, thereby reduce the operating cost of follow-up desulfurization process.
Foregoing only is the basic explanation under the utility model design, and according to any equivalent transformation that the technical solution of the utility model is done, all should belong to protection domain of the present utility model.
Claims (7)
1. the integrated apparatus of dedusting and flue gas waste heat recovery behind the boiler comprises the electric precipitation chamber, it is characterized in that also comprising heat-exchanging chamber and flue gas flow equalizing chamber;
Described heat-exchanging chamber upper end is provided with exhanst gas outlet, and exhanst gas outlet is provided with deflector I, and there is gas approach the lower end, and gas approach is provided with deflector II, and the middle part is provided with water-cooled heat exchanger; Described deflector I links to each other with the outlet of water-cooled heat exchanger, and described deflector II links to each other with the entrance of water-cooled heat exchanger;
Further, on the described water-cooled heat exchanger soot blower is housed;
Flue gas flow equalizing chamber front end is provided with deflector III, the rear end is provided with the rectification orifice plate;
The top that the inside of electric precipitation chamber is provided with anode system and cathod system, its cathod system is provided with hot blow and sweeps system;
Heat-exchanging chamber, flue gas flow equalizing chamber and bottom, electric precipitation chamber are respectively equipped with soot cleaning system;
Heat-exchanging chamber by the exhanst gas outlet that the upper end is provided be connected with the flue gas flow equalizing chamber, the flue gas flow equalizing chamber is connected with the gas approach that electric precipitation chamber front end is provided with by the exhanst gas outlet that the rear end is provided with.
2. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 1 is characterized in that the heat exchange element of described water-cooled heat exchanger is the fin-like blade pipe, and water (flow) direction is vertical with the flow of flue gas direction in the water-cooled heat exchanger.
3. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 2 is characterized in that described water-cooled heat exchanger is provided with soot blower.
4. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 3, the deflector III that it is characterized in that described flue gas flow equalizing chamber front end is 2 groups of circular blast baffles, radian is 55～75 °, and monolateral lengthening 0.5～1.0m.
5. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 4, the rectification orifice plate that it is characterized in that rear end, described flue gas flow equalizing chamber is arranged vertically in the flue gas flow equalizing chamber, the rectification orifice plate has the different openings rate, is installed with small-sized link plate on it.
6. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 5, it is characterized in that the rectification orifice plate aperture opening ratio of rear end, described flue gas flow equalizing chamber is 30～40%, hatch bore diameter is 90mm, the small-sized link plate that is equipped with on the rectification orifice plate is long 500mm, the square plate of wide 200mm, spot welding is welded extremely after being bolted on the rectification orifice plate, and the hole of opening on small-sized link plate and the rectification orifice plate is staggeredly arranged.
7. the integrated apparatus of dedusting and flue gas waste heat recovery behind a kind of boiler as claimed in claim 6 is characterized in that described soot cleaning system comprises ash bucket and steam-heating pipe, and steam-heating pipe is arranged on the ash bucket outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200786231U CN203177191U (en) | 2013-02-20 | 2013-02-20 | Boiler back dedusting and flue gas waste heat recovery integrated device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200786231U CN203177191U (en) | 2013-02-20 | 2013-02-20 | Boiler back dedusting and flue gas waste heat recovery integrated device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203177191U true CN203177191U (en) | 2013-09-04 |
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ID=49073880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200786231U Expired - Fee Related CN203177191U (en) | 2013-02-20 | 2013-02-20 | Boiler back dedusting and flue gas waste heat recovery integrated device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203177191U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090403A (en) * | 2013-02-20 | 2013-05-08 | 上海电气石川岛电站环保工程有限公司 | Integrated device for dust removal and flue gas waste heat recovery at back of boiler and application thereof |
| CN103551250A (en) * | 2013-11-05 | 2014-02-05 | 福建龙净环保股份有限公司 | Electric dust collector and vibrating method thereof |
-
2013
- 2013-02-20 CN CN2013200786231U patent/CN203177191U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090403A (en) * | 2013-02-20 | 2013-05-08 | 上海电气石川岛电站环保工程有限公司 | Integrated device for dust removal and flue gas waste heat recovery at back of boiler and application thereof |
| CN103090403B (en) * | 2013-02-20 | 2015-09-02 | 上海电气石川岛电站环保工程有限公司 | The integrated apparatus of dedusting and flue gas waste heat recovery after a kind of boiler and application thereof |
| CN103551250A (en) * | 2013-11-05 | 2014-02-05 | 福建龙净环保股份有限公司 | Electric dust collector and vibrating method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20130904 Termination date: 20140220 |