CN205824998U - A kind of small scall coal-fired boiler integral economizer - Google Patents
A kind of small scall coal-fired boiler integral economizer Download PDFInfo
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- CN205824998U CN205824998U CN201620730026.6U CN201620730026U CN205824998U CN 205824998 U CN205824998 U CN 205824998U CN 201620730026 U CN201620730026 U CN 201620730026U CN 205824998 U CN205824998 U CN 205824998U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 230000008020 evaporation Effects 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000000740 bleeding effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 17
- 239000002253 acid Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 10
- 229920006395 saturated elastomer Polymers 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 239000000428 dust Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000013517 stratification Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
This utility model provides a kind of small scall coal-fired boiler integral economizer, including low-temperature heat exchange part and high temperature heat exchanging part；Described low-temperature heat exchange part includes steam-generating bank, down-comer, cross over pipe, drum, first order coil group, liquidometer, bypass pipe, temperature measuring equipment, controller, water outlet collecting box pipe, control valve, economizer water inlet pipe and water inlet collecting box pipe, steam-generating bank is located in flue, the upper end of steam-generating bank is connected with drum, drum is located at the top of steam-generating bank, drum is provided with exhaustor, and exhaustor is provided with air bleeding valve；Described high temperature heat exchanging part includes that second level coil group, economizer outlet pipe and connecting tube, described second level coil are mounted in flue, and second level coil group is positioned at first order coil group upstream；Second level coil group is by least 2 coils.The combination steel economizer that this utility model relates to substitutes cast iron gilled tube economizer, enormously simplify processing technology, saves cost of manufacture.
Description
Technical field
This utility model relates to a kind of steel boiler of cast iron gilled tube economizer that substitutes to hot-water heating system, refers in particular to a kind of small-sized combustion
Coal burning boiler integral economizer.
Background technology
SO is produced during combustion of sulfur in coal3, SO3Steam is combined formation H in flue gas2SO4Steam.When boiler low-temperature is subject to
The wall temperature of hot side is less than H2SO4During the acid dew point of steam, H2SO4Steam forms condensed fluid the most in this place, and producing harm has: (1)
H2SO4Condensed fluid corrosion heating surface；(2) flying dust in the absorption of the condensed fluid on heating surface flue gas, forms " caking property " dust stratification.Acid knot
The consequence of dew is: economizer corrosion failure, leak；Superficial dust cannot be removed, and exchange capability of heat declines, and exhaust gas temperature raises.
In order to tackle the cold end corrosion of heating surface and reduce exhaust gas temperature, first the mankind have invented has anti-corrosion function
Cast iron gilled tube economizer, be mainly used in the miniature boiler that boiler feed temperature is relatively low, operation process is simple.
But, cast iron gilled tube economizer in addition to there is anti-corrosion function, other shortcoming highly significant: (1) boiler feed temperature is low
(room temperature), heating surface wall acid condensation in flue gas side is inevitable, although corrosion-resistant, but the condensed fluid bonding flue gas on heating surface
In flying dust, " caking property " dust stratification can be formed on heating surface so that the heat transmission resistance of heating surface increases, heat exchange amount significantly under
Fall；(2) manufacture of cast iron gilled tube economizer experienced by founding, casting, and all face lathes are processed, and joint flange is connected with bolt
Deng, yield rate is low, energy consumption is high, volume is big, only needs bend pipe, the complex process of welding, various, and cost more than steel economizer
High.
Investigation shows: (1) China uses the small scall coal-fired boiler of cast iron gilled tube economizer, substantial amounts, wide application, overall coal
Amount consumes huge；(2) because economizer surface wall acid condensation is inevitable, there is " caking property " dust stratification also in heating surface wall
Being inevitable, therefore, after boiler operatiopn, if operation management is not in place, boiler output meeting degradation, exhaust gas temperature drastically rises
High；(3) 10t/h and following small scall coal-fired boiler are because cold end corrosion, and for economic management angle, typically no configuration is empty
Air preheater, therefore, the drastically rising of exhaust gas temperature means that boiler efficiency drastically declines.Finding shows, although small-sized
Coal-burning boiler design efficiency is about 80%, because acid condensation trouble, but the actual operating efficiency of sizable a part of boiler
Less than 60%.
Analysis shows, transforms the small scall coal-fired boiler of single concrete unit or waste heat recovery, and economic benefit is effective,
Even without economic benefits；If using novel compositions steel economizer, the acid condensation solving this kind of boiler the most technically is asked
Topic, again from the relatively low manufacturing cost of manufacturing process, moreover it is possible to exhaust gas temperature is greatly lowered, for whole country, it is energy-conservation
Emission reduction effect will be the most notable.
Improving constantly along with boiler pressure, capacity and efficiency are isoparametric, the shortcoming of cast iron gilled tube economizer is completely exposed.In
It is that the advantage of steel economizer manifests again, bears that pressure is high, volume is little, manufacturing process is simple, low cost etc.；But, in order to
Prevent cold end corrosion, it is proposed that the precondition that steel economizer uses: boiler feedwater must be heated to ability after the temperature specified
Economizer can be sent into.
The precondition of steel economizer is used it can be seen that small scall coal-fired boiler uses steel from high parameter coal-burning boiler
The effort that the hope of economizer and needs are made.
At present, home and abroad is about little with the document of steel economizer replacement for small boiler cast iron gilled tube economizer.
In document, carry out exhaust heat recovering method about high-temperature smoke discharging more.As: patent documentation CN102243033 A
(2011.07.08 application) " vapour-liquid heat exchanger of a kind of low temperature resistant corrosion ", uses the heat exchanger of many heat pipe combination to add hot water
Recovered flue gas heat；Patent documentation CN102435083 A (2011.12.15 application) " the split type heat exchange that heat pipe wall temperature is controlled
Device ", heat air with Split hot Manifold technology, Mist heat recovering, when ambient temperature, boiler load change, by controlling
The circulating load of heat-transfer working medium adjusts heat exchange amount, prevents heating surface from acid dew condensation phenomenon occur.
Summary of the invention
The purpose of this utility model is in the deficiency manufactured and during use for existing cast iron gilled tube economizer, it is provided that a kind of
Small scall coal-fired boiler combined steel economizer, has that processing technique is simple, heating surface does not condenses, be formed without " caking property " amasss
Ash, moreover it is possible to reduce exhaust gas temperature and improve effect of boiler thermal output.
The technical solution of the utility model is as follows:
A kind of small scall coal-fired boiler integral economizer, including low-temperature heat exchange part and high temperature heat exchanging part；
Described low-temperature heat exchange part includes steam-generating bank, down-comer, cross over pipe, drum, first order coil group, liquid level
Meter, bypass pipe, temperature measuring equipment, controller, collecting box pipe, control valve group, economizer water inlet pipe and water inlet collecting box pipe, steam-generating bank sets
In flue, the upper end of steam-generating bank is connected with drum, and drum is located at the top of steam-generating bank, and drum is provided with exhaustor,
Exhaustor is provided with air bleeding valve；
Steam-generating bank is made up of at least 2 group evaporation bank of tubes, and any one group of evaporation bank of tubes is made up of at least 2 heat exchanger tubes, appoints
The anticipate lower end of the heat exchanger tube on one group of evaporation bank of tubes connects collecting box pipe by one and is connected, the adjacent connection evaporated on bank of tubes
Collecting box pipe is connected by cross over pipe；
Described first order coil is mounted in drum, and first order coil group is made up of at least 2 coils, and all
The water inlet end of the coil in first order coil group is parallel on water collecting box pipe, snakelike in all first order coil groups
The water side of pipe is parallel on a water outlet collecting box pipe, and described water outlet collecting box pipe is connected with one end of bypass pipe, bypass pipe
The other end is connected with collecting box pipe, and being connected between collecting box pipe with water inlet collecting box pipe has control valve group, and control valve group is by least 2 controls
Valve processed forms；Control valve group is electrically connected with the signal output part of controller, and the signal input part of controller is electrically connected with thermometric dress
Putting, temperature measuring equipment is located on drum；
The upper end of described down-comer is connected with the lower wall of drum, and the lower end of down-comer is connected with cross over pipe；Described liquid
The upper end of position meter is connected with drum, and the lower end of liquidometer is connected with the connection collecting box pipe in steam-generating bank；
Described high temperature heat exchanging part includes second level coil group, economizer outlet pipe and connecting tube, described second level Serpentis
Shape pipe is mounted in flue, and second level coil group is positioned at steam-generating bank upstream, and second level coil group is snakelike by least 2
Pipe forms；The water inlet end of all coils in the coil group of the second level is parallel on a water inlet end collecting box pipe, water inlet end collection
Case pipe is connected by connecting tube with the water outlet collecting box pipe of first order coil group；With the coil in first order coil group
Water side is parallel on a water side collecting box pipe, and water side collecting box pipe is connected with economizer outlet pipe.
Further, described control valve is electromagnetic valve or ball valve.
Further, the material of described economizer is boiler steel.
System Working Principle: steam-generating bank absorbs the heat of flue gas, and the saturated heat-transfer working medium water in steam-generating bank is turned
Becoming saturated vapor, saturated vapor enters drum；It is saturated that first order snakelike heat exchange tube group and bypass heat exchanger tube absorb in drum
The steam latent heat boiler feedwater to flowing through in pipe heating for the first time, boiler feedwater heats up, and saturated vapor release latent heat becomes saturated
Water, flows back in steam-generating bank under gravity, such cycle heat exchange；Second level snakelike heat exchange tube group absorbs the heat of flue gas
Amount, continues heating to the boiler feedwater heated up.
In order to ensure that the wall surface temperature of steam-generating bank is higher than acid dew point, it is desirable to the saturation temperature of steam-generating bank transfer working medium in heat
Higher than acid dew point, its method is that the number of the control valve group open and close adjusting all control valves composition is (particularly as follows: pass through controlling
Write-in program in device, controller receives the signal of temperature measuring equipment and judges, and then realizing the control of the number of valve group open and close
System), regulate first order snakelike heat exchange tube group and the caloric receptivity of bypass heat exchanger tube, when the heat of steam-generating bank absorption flue gas is more than
When first order snakelike heat exchange tube group and bypass heat exchanger tube absorb the heat of steam, in the saturation temperature of steam-generating bank transfer working medium in heat
Rise, otherwise, then decline.
Advantage of the present utility model:
(1) combination steel economizer substitutes cast iron gilled tube economizer, enormously simplify processing technology, saves cost of manufacture；
(2) combination steel economizer has been inherently eliminated heating surface acid condensation and heating surface " caking property " dust stratification problem,
Achieve design performance and the unification on runnability of small scall coal-fired boiler；
(3) exhaust gas temperature declines more, and energy-saving effect is obvious.
Accompanying drawing explanation
Fig. 1 is forward sight structural representation of the present utility model；
Fig. 2 is the structural representation of one group of steam-generating bank.
In figure: it is snakelike that 1-steam-generating bank, 101-connect collecting box pipe, 2-down-comer, 3-cross over pipe, 4-drum, the 5-first order
Pipe group, 6-liquidometer, 7-second level coil group, 8-economizer outlet pipe, 9-connecting tube, 10-bypass pipe, 11-air bleeding valve,
12-temperature measuring equipment, 13-controller, 14-collecting box pipe, 15-control valve group, 16-economizer water inlet pipe, 17-are intake collecting box pipe
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is further described:
As shown in Figure 1, 2, a kind of small scall coal-fired boiler integral economizer, including low-temperature heat exchange part and high temperature heat exchanging part
Point；
Described low-temperature heat exchange part includes steam-generating bank 1, down-comer 2, cross over pipe 3, drum 4, first order coil group
5, liquidometer 6, bypass pipe 10, temperature measuring equipment 12, controller 13, collecting box pipe 14, control valve group 15, economizer water inlet pipe 16 and enter
Water collecting box pipe 17, steam-generating bank 1 is located in flue, and the upper end of steam-generating bank 1 is connected with drum 4, and drum 4 is located at steam-generating bank
The top of 1, drum 4 is provided with exhaustor, and exhaustor is provided with air bleeding valve 11；
Steam-generating bank 1 is made up of at least 2 group evaporation bank of tubes, and any one group of evaporation bank of tubes is made up of at least 2 heat exchanger tubes, appoints
The anticipate lower end of the heat exchanger tube on one group of evaporation bank of tubes connects collecting box pipe 101 by one and is connected, on adjacent evaporation bank of tubes
Connect collecting box pipe 101 to be connected by cross over pipe 3；
Described first order coil group 5 is located in drum 4, and first order coil group 5 is made up of at least 2 coils, and
The water inlet end of the coil in all first order coil groups 5 is parallel on water collecting box pipe 17, all first order coil groups 5
On the water side of coil be parallel on a water outlet collecting box pipe, described water outlet collecting box pipe is connected with one end of bypass pipe 10
Logical, the other end of bypass pipe 10 is connected with collecting box pipe 14, and being connected between collecting box pipe 14 with water inlet collecting box pipe 17 has control valve group
15, control valve group 15 is made up of at least 2 control valves；Control valve group 15 is electrically connected with the signal output part of controller 13, controls
The signal input part of device 13 is electrically connected with temperature measuring equipment 12, and temperature measuring equipment 12 is located on drum 4；
The upper end of described down-comer 2 is connected with the lower wall of drum 4, and the lower end of down-comer 2 is connected with cross over pipe 3；Institute
The upper end stating liquidometer 6 is connected with drum 4, and the lower end of liquidometer 6 is connected with the connection collecting box pipe 101 in steam-generating bank 1；
Described high temperature heat exchanging part includes second level coil group 7, economizer outlet pipe 8 and connecting tube 9, the described second level
Coil group 7 is located in flue, and second level coil group 7 is positioned at steam-generating bank 1 upstream, therefore, coil group 7 place, the second level
Flue at temperature higher relative to the temperature at the flue at steam-generating bank 1 place；Second level coil group 7 is by least 2
Coil forms；The water inlet end of all coils in second level coil group 7 is parallel on a water inlet end collecting box pipe, water inlet
End collecting box pipe is connected by connecting tube 9 with the water outlet collecting box pipe of first order coil group 5；Institute in second level coil group 7
Have on a water side collecting box pipe in parallel of coil, and be connected with economizer outlet pipe 8.
Described control valve is electromagnetic valve or ball valve, and the material of described economizer is boiler steel.
Concrete principle and applicable cases be described below:
Smoke convection washes away steam-generating bank 1, transfers heat to the heat-transfer working medium water in steam-generating bank 1, saturation
Heat-transfer working medium water 18 becomes saturated vapor after absorbing heat, enter drum 4；Drum 4 upper end is mounted with exhaust steam valve 11, temperature measuring equipment
12, first order coil group 5 in parallel and bypass pipe 10 are installed in drum 4, economizer water inlet pipe 16 connects water inlet collecting box pipe 17,
Boiler feedwater enters in first order snakelike heat exchange tube group 5 after economizer water inlet pipe 16, water inlet header 17, and boiler feedwater absorbs
In drum 4, saturated vapor latent heat heats up, and saturated vapor release latent heat becomes saturated condensed water, under gravity, low by drum 4
The down-comer 2 in portion flows back in steam-generating bank 1.
High temperature heat exchanging part is second level coil group 1, and second level coil group 1 is arranged in high-temperature flue gas section, and boiler is given
Water, after low-temperature heat exchange part heats up, is delivered to second level coil group 7 by connecting tube 9 and is heated, the pot after again heating up
Stove feedwater is sent into next boiler heat exchange parts by economizer outlet pipe 8.
The coal type change that small scall coal-fired boiler uses is frequent, for this situation, in water inlet collecting box pipe 17 and water outlet header
Arranging control valve group 15 between pipe 14, such as: when the sulfur content in coal is higher, acid dew-point temperature improves, now, by controller 13
The temperature arranged in program is heightened, and the valve number that control valve group 15 is controlled to close by controller 13 reduces, and passes in steam-generating bank 1
The saturation temperature of hot working fluid water 18 raises, and ensures that the wall surface temperature of steam-generating bank is higher than acid dew point with this.In like manner, containing in coal
When sulfur content is relatively low, the temperature arranged in controller 13 program is turned down, then can reclaim the heat energy of more flue gas.
When the stable operation of the boiler long period, periodically open air bleeding valve 11, get rid of the on-condensible gas of low-temperature heat exchange part,
Keep heat transfer efficient heat exchange.
Applicable cases: 1 capacity 10t/h, pressure 1.25MPa, the steam boiler of vapor (steam) temperature 194 DEG C, feed temperature 20
DEG C, use cast iron gilled tube economizer, exhaust gas temperature 166 DEG C.After boiler operatiopn, economizer dust stratification, actual exhaust gas temperature 190 DEG C～240
℃.Using the feedwater heating of this small scall coal-fired boiler integral economizer, exhaust gas temperature can reduce to 135 DEG C.
Claims (3)
1. a small scall coal-fired boiler integral economizer, it is characterised in that include low-temperature heat exchange part and high temperature heat exchanging part；
Described low-temperature heat exchange part includes that steam-generating bank (1), down-comer (2), cross over pipe (3), drum (4), the first order are snakelike
Pipe group (5), liquidometer (6), bypass pipe (10), temperature measuring equipment (12), controller (13), collecting box pipe (14), control valve group (15),
Economizer water inlet pipe (16) and water inlet collecting box pipe (17), steam-generating bank (1) is located in flue, the upper end of steam-generating bank (1) and vapour
Bag (4) is connected, and drum (4) is located at the top of steam-generating bank (1), and drum (4) is provided with exhaustor, and exhaustor is provided with aerofluxus
Valve (11)；
Steam-generating bank (1) is made up of at least 2 group evaporation bank of tubes, and any one group of evaporation bank of tubes is made up of at least 2 heat exchanger tubes, arbitrarily
The lower end of the heat exchanger tube on one group of evaporation bank of tubes connects collecting box pipe (101) by one and is connected, on adjacent evaporation bank of tubes
Connect collecting box pipe (101) to be connected by cross over pipe (3)；
Described first order coil group (5) is located in drum (4), and first order coil group (5) is made up of at least 2 coils,
And the water inlet end of the coil on all first order coil group (5) is parallel on water collecting box pipe (17), all first order Serpentiss
The water side of the coil in shape pipe group (5) is parallel on a water outlet collecting box pipe, described water outlet collecting box pipe and bypass pipe (10)
One end be connected, the other end of bypass pipe (10) is connected with collecting box pipe (14), collecting box pipe (14) with water inlet collecting box pipe (17)
Between connect have control valve group (15), control valve group (15) to be made up of at least 2 control valves；Control valve group (15) is electrically connected with control
The signal output part of device processed (13), the signal input part of controller (13) is electrically connected with temperature measuring equipment (12), temperature measuring equipment (12)
It is located on drum (4)；
The upper end of described down-comer (2) is connected with the lower wall of drum (4), and the lower end of down-comer (2) is connected with cross over pipe (3)
Logical；The upper end of described liquidometer (6) is connected with drum (4), the lower end of liquidometer (6) and the connection collection in steam-generating bank (1)
Case pipe (101) is connected；
Described high temperature heat exchanging part includes second level coil group (7), economizer outlet pipe (8) and connecting tube (9), described second
Level coil group (7) is located in flue, and second level coil group (7) is positioned at steam-generating bank (1) upstream, second level coil group
(7) it is made up of at least 2 coils；The water inlet end of all coils on second level coil group (7) is parallel to a water inlet
On end collecting box pipe, water inlet end collecting box pipe is connected by connecting tube (9) with the water outlet collecting box pipe of first order coil group (5)；The
On the collecting box pipe in parallel of the water side of all coils on two grades of coil groups (7), and it is connected with economizer outlet pipe (8)
Logical.
A kind of small scall coal-fired boiler integral economizer the most according to claim 1, it is characterised in that described control valve is
Electromagnetic valve or ball valve.
A kind of small scall coal-fired boiler integral economizer the most according to claim 1 and 2, it is characterised in that described province coal
The material of device is boiler steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620730026.6U CN205824998U (en) | 2016-07-12 | 2016-07-12 | A kind of small scall coal-fired boiler integral economizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620730026.6U CN205824998U (en) | 2016-07-12 | 2016-07-12 | A kind of small scall coal-fired boiler integral economizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106016240A (en) * | 2016-07-12 | 2016-10-12 | 江苏大学 | Combined coal economizer of small coal-fired boiler |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106016240A (en) * | 2016-07-12 | 2016-10-12 | 江苏大学 | Combined coal economizer of small coal-fired boiler |
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