CN107013901A - A kind of condensed-water recovering device and method based on waste heat boiler low-temperature flue gas - Google Patents
A kind of condensed-water recovering device and method based on waste heat boiler low-temperature flue gas Download PDFInfo
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- CN107013901A CN107013901A CN201710378311.5A CN201710378311A CN107013901A CN 107013901 A CN107013901 A CN 107013901A CN 201710378311 A CN201710378311 A CN 201710378311A CN 107013901 A CN107013901 A CN 107013901A
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- heat exchanger
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- Water Supply & Treatment (AREA)
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas and method, including waste heat boiler (6), flue (1), chimney (10), the first water pump (2) and water supply tank (3), characterized in that, also including plate type heat exchanger (8), collection cylinder (4) and condensate water collecting case (7)；The plate type heat exchanger is arranged in the front end smoke canal between waste heat boiler (6) and chimney (10), the soft water outlet of plate type heat exchanger is connected with the feedwater piping of waste heat boiler, and the jet chimney outlet connection of waste heat boiler collects cylinder (4), condensate water collecting case (7) is arranged at below the cold water outlet of plate type heat exchanger.By setting plate type heat exchanger in flue, low-temperature flue gas waste heat is fully reclaimed, boiler feed temperature is improved, combustion gas utilization ratio is improved；Recovered flue gas condensate, as boiler replenishing water, alleviates the Northwest's water shortage phenomenon；When preventing that winter from running, flue, chimney arrangement icing phenomenon increase the service life.
Description
Technical field
The invention belongs to waste heat boiler recycling field, more particularly to a kind of condensate based on waste heat boiler low-temperature flue gas is returned
Receiving apparatus and method.
Background technology
For a long time, water resource lacks the main restricting factor of always the Northwest's socio-economic development, while also closing
It is the normal life and social stability of city dweller.Surface water excessive exploitation, river water contamination is increasingly serious, more exacerbates
The water shortage of the Northwest.Serious water shortage is northwest presently the most distinct issues.Counted according to hydraulic department, northwest consumption per day per capita
Only 131L, water 216.9L level is used far below National urban per capita.Whenever drought in summer, urban district is supplied water more difficult.
Natural gas obtains more and more use in the winter time as a kind of high-quality, efficient, cleaning boiler oil in heating.
Start within 16 years, northwest somewhere requires progressively to close down coal-burning boiler, to 16 years warm seasons, all realize clear based on natural gas
Clean energy heat supply.When investigating gas fired-boiler flue gas waste heat utilization device at the scene, it is found that most using effect is undesirable.It is main former
Cause：1) high fume temperature, fume afterheat does not make full use of；2) condensate could not be recycled, with fume emission to outdoor environment
In；3) contain sulfide in flue gas, steam condenses at chimney, corrode flue, chimney etc..
Because natural gas contains after a large amount of hydrogen atoms, therefore burning, vapour content is high in flue gas, and burn 1m3Natural gas is produced
Actual steam quality is about 1.67kg/m in raw flue gas3.When flue gas is less than dew point, the steam generation of flue gas reclaimed water condenses,
Contain a large amount of waste heats and vapor in the smoke evacuation of waste heat boiler.Major part residual heat using device is not provided with water-logging box, cigarette at present
Chimney bottom is also fitted without condensate drain and bears water facility substantially, causes condensate largely to be oozed out in flue afterbody, chimney wall, corrodes
Flue, chimney wall.
The content of the invention
The invention provides a kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas and method, its purpose exists
In overcoming the flue-gas temperature of waste heat boiler of the prior art discharge and the loss of steam energy, the condensate of generation is to flue
The problem of erosion being produced with chimney.
A kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas, including waste heat boiler 6, flue 1, chimney 10,
First water pump 2 and water supply tank 3, in addition to plate type heat exchanger 8, collection cylinder 4 and condensate water collecting case 7；
The plate type heat exchanger is arranged in the front end smoke canal between waste heat boiler 6 and chimney 10, plate type heat exchanger it is soft
Water out is connected with the jet chimney of waste heat boiler, and the jet chimney outlet connection collection cylinder 4 of waste heat boiler, condensate water collecting
Case 7 is arranged at below the cold water outlet of plate type heat exchanger.
Further, in addition to the second water pump 9 and soft water processor 5；
The condensate water collecting case 7, soft water processor 5 and water supply tank 3 pass sequentially through pipeline connection, and condensate water collecting
The second water pump 9 is provided between case 7 and soft water processor device 5, water supply tank is connected with plate type heat exchanger.
Further, in addition to the heat-accumulator tank that is arranged above the heat outlet of plate type heat exchanger.
Waste heat is collected using heat-accumulator tank, for heating domestic water etc.；
A kind of method for recovering condensation water based on waste heat boiler low-temperature flue gas, comprises the following steps：
Step 1：The flue gas that waste heat boiler 6 is discharged is introduced into plate type heat exchanger 8, meanwhile, the low temperature soft water in water supply tank leads to
Cross in the first water pump feeding plate type heat exchanger, high-temperature flue gas after soft water heat exchange with cooling, and flue-gas temperature passes through after being reduced to 45 DEG C
Chimney 10 is discharged into air, changes in thermogenetic high temperature soft water feeding waste heat boiler 6, collection is delivered to through the jet chimney in waste heat boiler
Cylinder 4；
Step 2：The condensate that flue gas after cooling is formed in plate type heat exchanger is flowed into condensate water collecting case.
Further, the water in the condensate water collecting case is pumped into soft water processor 5 through the second water pump 9, softened place
After reason, it is delivered in water supply tank 3.
Further, the pH value verifying attachment is tested to the condensate in condensate water collecting case.
Further, by setting heat-accumulator tank to collect waste heat on the heat outlet of plate type heat exchanger.
After the waste heat of generation is collected by heat-accumulator tank, for heating domestic water etc..
Beneficial effect
The invention provides a kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas, including waste heat boiler 6, cigarette
Road 1, chimney 10, the first water pump 2 and water supply tank 3, in addition to plate type heat exchanger 8, collection cylinder 4 and condensate water collecting case 7；It is described
Plate type heat exchanger is arranged in the front end smoke canal between waste heat boiler 6 and chimney 10, the soft water outlet and waste heat of plate type heat exchanger
The jet chimney of boiler is connected, and the jet chimney outlet connection collection cylinder 4 of waste heat boiler, and condensate water collecting case 7 is arranged at plate
Below the cold water outlet of formula heat exchanger.By being researched and analysed to the smoke components progress in waste heat boiler is substantial amounts of, waste heat pot is found
The heat contained by flue gas in stove is wasted, and plate type heat exchanger is set in flue, fully reclaims low-temperature flue gas waste heat, production life
Hot water living, improves combustion gas utilization ratio, saves combustion gas usage amount；Meanwhile, it is found that flue gas can be produced after plate type heat exchanger
Condensate, and set condensate water collecting case recovered flue gas condensate, as boiler replenishing water, has greatly reclaimed contained in flue gas
Heat and water, alleviate the Northwest's water shortage phenomenon；When preventing that winter from running, flue, chimney arrangement icing phenomenon, postponing it makes
Use the life-span.
Brief description of the drawings
Fig. 1 is the structural representation of device of the present invention；
Fig. 2 is the schematic flow sheet of the method for the invention.
Embodiment
The present invention is described further below in conjunction with drawings and examples.
As shown in figure 1, a kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas, including waste heat boiler 6, flue
1st, chimney 10, the first water pump 2 and water supply tank 3, in addition to plate type heat exchanger 8, collection cylinder 4 and condensate water collecting case 7；
The plate type heat exchanger is arranged in the front end smoke canal between waste heat boiler 6 and chimney 10, the heat of plate type heat exchanger
Gas outlet is connected with the jet chimney of waste heat boiler, and the jet chimney outlet connection collection cylinder 4 of waste heat boiler, condensate water collecting
Case 7 is arranged at below the cold water outlet of plate type heat exchanger.
Also include the second water pump 9 and soft water processor 5；The condensate water collecting case 7, soft water processor 5 and moisturizing
Case 3 passes sequentially through pipeline connection, and the second water pump 9, water supply tank are provided between condensate water collecting case 7 and soft water processor device 5
It is connected with plate type heat exchanger.
Waste heat is collected using heat-accumulator tank, for heating domestic water etc.；The hot gas for also including being arranged at plate type heat exchanger goes out
Heat-accumulator tank above mouthful.
As shown in Fig. 2 a kind of method for recovering condensation water based on waste heat boiler low-temperature flue gas, comprises the following steps：
Step 1：The flue gas that waste heat boiler 6 is discharged is introduced into plate type heat exchanger 8, meanwhile, the low temperature soft water in water supply tank leads to
Cross in the first water pump feeding plate type heat exchanger, high-temperature flue gas after water heat exchange with cooling, and flue-gas temperature is reduced to after 45 DEG C by cigarette
Chimney 10 is discharged into air, changes in thermogenetic high temperature soft water feeding waste heat boiler 6, collection vapour is delivered to through the jet chimney in waste heat boiler
Cylinder 4；
Step 2：The condensate that flue gas after cooling is formed in plate type heat exchanger is flowed into condensate water collecting case.
Water in the condensate water collecting case is pumped into soft water processor 5 through the second water pump 9, after softened processing, conveying
Into water supply tank 3.
The pH value verifying attachment is tested to the condensate in condensate water collecting case.
By setting heat-accumulator tank to collect waste heat on the heat outlet of plate type heat exchanger.
After the waste heat of generation is collected by heat-accumulator tank, for heating domestic water etc..
In this example, it is as follows to the vapor progress analytic explanation of waste heat boiler smoke evacuation component, flue gas first
The component 1. waste heat boiler is discharged fume；
Combustion of natural gas produces a large amount of flue gases, and theoretical flue gas composition has CO2、SO2、N2And H2O.Because combustion of natural gas is needed
Want large quantity of air combustion-supporting, to ensure burning, upstream combustion chamber air-fuel ratio α general controls are 1.1~1.3.So actual exhaust gas volumn
Also containing superfluous O2.Because gas component does not contain H2S, therefore actual flue gas composition is CO2、N2、H2O and O2.Root below
According to the gas component of table 1, burning 1m is calculated3The actual exhaust gas volumn that natural gas is produced.
The actual exhaust gas volumn computational chart of the combustion of natural gas of table 1
Note：Combustion gas saturation water capacity takes dg=10g/m3, local winter air water capacity da=6.5g/m3, excess air system
Number α takes 1.2.
2. the vapor of flue gas
Due to gas component not sulfur-bearing, so flue gas dew point temperature is equal to flue gas aqueous dew point temperature, according to natural gas
Combustion product reclaimed water vapor volume accounts for the share of flue gas volume, can try to achieve flue gas aqueous dew point temperature.When flue gas is normal pressure, flue gas
Aqueous dew point temperature and vapor relation are shown in Table 2.
The relation table of the flue gas aqueous dew point temperature of table 2 and vapour content (percent by volume)
| Flue gas vapour content/% | 5 | 10 | 15 | 20 | 30 | 50 |
| Flue gas aqueous dew point temperature/DEG C | 32.3 | 45.6 | 53.7 | 59.7 | 68.7 | 80.9 |
As seen from the above table, after certain distributed energy resource system combustion of natural gas, vapour content is 2.134/2.92 in flue gas
=16.5%, flue gas aqueous dew point temperature is tried to achieve for 55.5 DEG C by interpolation method.
Water-vapour density ρ=0.833kg/m under standard state3.Steam quality M in every cube of flue gasH2OIt is calculated as follows.
MH2O=VH2O×ρH2O=2.134 × 0.833=1.778kg/m3
When flue gas is less than dew point, the steam generation of flue gas reclaimed water condenses.Steam-laden in flue gas under corresponding temperature
Partial pressure can obtain condensation rate, by the lower condensation rate × M of different cigarette temperatureH2OObtain the 1m that burnt under different cigarette temperature3Natural gas produces cigarette
Condensing capacity in gas, is shown in Table 3.
Water recovery rate and condensing capacity relation table under the different cigarette temperature of table 3
| Exhaust gas temperature/DEG C | 55 | 50 | 45 | 40 | 30 | 20 |
| Condensation rate/% | 0.143 | 0.354 | 0.514 | 0.635 | 0.797 | 0.890 |
| Condensing capacity/kg/m3) | 0.254 | 0.629 | 0.914 | 1.129 | 1.417 | 1.582 |
The a set of 15MW gas turbines in northwest somewhere and the supporting distributing-supplying-energy system of waste heat boiler, not using flue gas condensed
Bear water before recovery measure, chimney emission temperature has condensate to ooze out at 90 DEG C or so at equipment, outdoor chimney periphery has icing existing
As not only the heat of condensate is not utilized in flue gas, also corrodes equipment, chimney raft.
The problem of with reference to current exhaust-heat boiler flue gas using existing, after using fume gas condensation Water Sproading measure, final cigarette
Chimney exhaust gas temperature is about 45 DEG C, a water system rate of water make-up 4.57t can be saved per hour, waste heat recovery volume is 775kJ/m3,
2.7 DEG C of waste heat boiler moisturizing temperature rise.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although with reference to above-described embodiment pair
The present invention is described in detail, those of ordinary skills in the art should understand that：Still can be to the specific of the present invention
Embodiment is modified or equivalent substitution, and any modification or equivalent substitution without departing from spirit and scope of the invention,
It all should cover among scope of the presently claimed invention.
Claims (7)
1. a kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas, including waste heat boiler (6), flue (1), chimney
(10), the first water pump (2) and water supply tank (3), it is characterised in that also including plate type heat exchanger (8), collection cylinder (4) and condensation
Water collection tank (7)；
The plate type heat exchanger is arranged in the front end smoke canal between waste heat boiler (6) and chimney (10), plate type heat exchanger it is soft
Water out is connected with the feedwater piping of waste heat boiler, and the jet chimney outlet connection collection cylinder (4) of waste heat boiler, and condensate is received
Header (7) is arranged at below the cold water outlet of plate type heat exchanger.
2. device according to claim 1, it is characterised in that also including the second water pump (9) and soft water processor (5)；
The condensate water collecting case (7), soft water processor (5) and water supply tank (3) pass sequentially through pipeline connection, and condensate is received
The second water pump (9) is provided between header (7) and soft water processor device (5), water supply tank is connected with plate type heat exchanger.
3. device according to claim 1 or 2, it is characterised in that the also heat outlet including being arranged at plate type heat exchanger
The heat-accumulator tank of top.
4. a kind of method for recovering condensation water based on waste heat boiler low-temperature flue gas, it is characterised in that comprise the following steps：
Step 1：The flue gas of waste heat boiler (6) discharge is introduced into plate type heat exchanger (8), meanwhile, the low temperature soft water in water supply tank leads to
Cross in the first water pump feeding plate type heat exchanger, high-temperature flue gas after soft water heat exchange with cooling, and flue-gas temperature passes through after being reduced to 45 DEG C
Chimney (10) is discharged into air, changes in thermogenetic high temperature soft water feeding waste heat boiler (6), is sent through the jet chimney in waste heat boiler
To collection cylinder (4)；
Step 2：The condensate that flue gas after cooling is formed in plate type heat exchanger is flowed into condensate water collecting case.
5. method according to claim 4, it is characterised in that the water in the condensate water collecting case is through the second water pump (9)
It is pumped into soft water processor (5), after softened processing, is delivered in water supply tank (3).
6. method according to claim 5, it is characterised in that the pH value verifying attachment is to solidifying in condensate water collecting case
Bear water and test.
7. the method according to claim any one of 4-6, it is characterised in that by the heat outlet of plate type heat exchanger
Heat-accumulator tank is set to collect waste heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710378311.5A CN107013901A (en) | 2017-05-24 | 2017-05-24 | A kind of condensed-water recovering device and method based on waste heat boiler low-temperature flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710378311.5A CN107013901A (en) | 2017-05-24 | 2017-05-24 | A kind of condensed-water recovering device and method based on waste heat boiler low-temperature flue gas |
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| Publication Number | Publication Date |
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| CN107013901A true CN107013901A (en) | 2017-08-04 |
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| CN201710378311.5A Withdrawn CN107013901A (en) | 2017-05-24 | 2017-05-24 | A kind of condensed-water recovering device and method based on waste heat boiler low-temperature flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195216A (en) * | 2018-02-24 | 2018-06-22 | 李宜立 | Steam and residual heat using device and its technique in flue gas |
| CN109865405A (en) * | 2017-12-02 | 2019-06-11 | 哈尔滨工大金涛科技股份有限公司 | The dehumidifying of natural gas flue gas disappears white device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1414321A (en) * | 2002-11-19 | 2003-04-30 | 西安交通大学 | Deep utilization of heat energy in exhaust gas and method of using its aqueous vapour as natural resources |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN204153755U (en) * | 2014-07-17 | 2015-02-11 | 常州市奥琳斯邦热能设备有限公司 | Energy-saving fuel steam boiler system |
| CN204421043U (en) * | 2015-01-23 | 2015-06-24 | 中核动力设备有限公司 | Off-gas recovery deep condensation device |
| CN205014336U (en) * | 2015-08-13 | 2016-02-03 | 中节能（常州）城市节能研究院有限公司 | Flue gas waste heat utilization equipment of natural gas boiler |
| CN206724139U (en) * | 2017-05-24 | 2017-12-08 | 湖南泰通能源管理股份有限公司 | A kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas |
-
2017
- 2017-05-24 CN CN201710378311.5A patent/CN107013901A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414321A (en) * | 2002-11-19 | 2003-04-30 | 西安交通大学 | Deep utilization of heat energy in exhaust gas and method of using its aqueous vapour as natural resources |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN204153755U (en) * | 2014-07-17 | 2015-02-11 | 常州市奥琳斯邦热能设备有限公司 | Energy-saving fuel steam boiler system |
| CN204421043U (en) * | 2015-01-23 | 2015-06-24 | 中核动力设备有限公司 | Off-gas recovery deep condensation device |
| CN205014336U (en) * | 2015-08-13 | 2016-02-03 | 中节能（常州）城市节能研究院有限公司 | Flue gas waste heat utilization equipment of natural gas boiler |
| CN206724139U (en) * | 2017-05-24 | 2017-12-08 | 湖南泰通能源管理股份有限公司 | A kind of condensed-water recovering device based on waste heat boiler low-temperature flue gas |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109865405A (en) * | 2017-12-02 | 2019-06-11 | 哈尔滨工大金涛科技股份有限公司 | The dehumidifying of natural gas flue gas disappears white device |
| CN108195216A (en) * | 2018-02-24 | 2018-06-22 | 李宜立 | Steam and residual heat using device and its technique in flue gas |
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Address after: 410116 Hunan province Changsha hi tech Development Zone, Lu Tin Road No. 28 Minmetals Lugu Science Park B2 building 501 room Applicant after: HUNAN TAITONG ENERGY MANAGEMENT CO.,LTD. Address before: 410116 Hunan province Changsha City Lugu high tech Zone base Oak Park building B2 Applicant before: HUNAN TAITONG ELECTRIC POWER SCIENCE AND TECHNOLOGY Co.,Ltd. |
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Application publication date: 20170804 |