CN101956986A - Method for recycling low-temperature waste heat from waste incineration fume - Google Patents
Method for recycling low-temperature waste heat from waste incineration fume Download PDFInfo
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- CN101956986A CN101956986A CN 201010519559 CN201010519559A CN101956986A CN 101956986 A CN101956986 A CN 101956986A CN 201010519559 CN201010519559 CN 201010519559 CN 201010519559 A CN201010519559 A CN 201010519559A CN 101956986 A CN101956986 A CN 101956986A
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Abstract
The invention relates to a method for recycling low-temperature waste heat from waste incineration fume. The method comprises the following steps of: (1) introducing dedusted low-temperature waste incineration fume into a cold end of a heat pipe type heat exchanger to cool, wherein a heat-conducting medium in a heat pipe is gasified and enters a hot end of the heat pipe at the same time, and fume contact sides of the heat pipe type heat exchanger are coated with an anticorrosive material; (2) introducing the cooled fume into a shell pass of a shell and tube condenser and fully exchanging the heat between the cooled fume and room temperature water in a tube pass to recycle the waste heat, wherein the fume contact sides of the shell and tube condenser are coated with the anticorrosive material; (3) collecting fume condensed fluid under the action of gravity on the lower part of the condenser to discharge, and performing subsequent innocent treatment; (4) introducing the condensed fume into the hot end of the heat pipe type heat exchanger to heat, wherein the heat conducting medium in the heat pipe is condensed and is returned to the cold end of the heat pipe in a gravity flow mode for repeated heat exchange at the same time; and (5) introducing the heated fume into a chimney to discharge directly. The method has the advantages of simple process, compact structure, small occupied area, small investment, low operating cost and the like, and thus has wide development prospect and high popularization value.
Description
Technical field
The present invention relates to a kind of low temperature exhaust heat recovery method of flue gas, particularly the low temperature exhaust heat of flue gas of refuse burning is recycled, and is applicable to that also the low temperature exhaust heat of the field flue gases such as iron and steel, chemical industry of the same terms is recycled.
Background technology
The generation of domestic waste, crop material, municipal sludge is big, coverage is wide, has become one of serious restriction Chinese society, economic key factor that develops in a healthy way.At present, the generation of National urban house refuse is up to 1.6 hundred million tons/year, and just increases year by year with the speed of 5%-8%.Incineration technology is handled domestic waste, owing to have the rubbish of making minimizing to greatest extent, the advantages such as resource of the minimum innoxious and heat energy utilization that pollutes are risen just at home gradually.According to incompletely statistics, at present domestic existing nearly 100 garbage incinerating power plants drop in succession to be built and operation, and China is also with solid waste burning power plants such as a rubbish, mud and stalk surplus newly-built 300 in the five-year.
Because all multifactor impacts such as economic condition and geographical environments, the high characteristics of Chinese rubbish ubiquity moisture content can reach more than 50% usually.Smoke evacuation moisture content after the waste incineration surpasses 30%, and temperature reaches more than 150 ℃, and water vapour thereby directly discharged not only causes the flue gas physics sensible heat usefulness of not making a profit, and the latent heat of vaporization also wastes, and also can form strong white cigarette during winter, and peripheral resident is caused puzzlement.
Present authorized flue gas waste heat recovery patent is more, but relates generally to following content: 1. middle high-temperature flue gas waste heat recovery or the waste heat boiler transformation more than 200 ℃, as " a kind of flue gas waste heat recovery method and device thereof "; 2. the waste heat recovery of fire coal or sinter fume is as " latent heat method flue gas waste heat recovery system ".By comparison, the invention belongs to the degree of depth waste heat recovery of low-temperature flue gas, flue-gas temperature need be reduced to below 50 ℃ fully recycle-water steam latent heat, and the spontaneous draught capacity of flue gas thereby reduce greatly is difficult to directly discharge by chimney; In addition, be rich in multiple sour gas in the flue gas of refuse burning, as HCL, HF, NOx and SOx etc., the acid corrosion that produces in the condensing heat-exchange process is extremely strong, and the plant maintenance in the waste heat recovery is also relative with design difficulty bigger.
Summary of the invention
The present invention provides for solving the technical problem that exists in the known technology that a kind of flow process is simple, high efficiency, flue gas of refuse burning low temperature exhaust heat recovery method cheaply.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of low temperature exhaust heat recovery method of flue gas of refuse burning, comprise the steps: that (one) lowers the temperature the cold junction that the low temperature flue gas of refuse burning after the dedusting passes to heat-pipe heat exchanger, heat-conducting medium while generating gasification in the heat pipe also enters the heat pipe hot junction, and the flue gas contact side of heat exchange of heat pipe all applies anticorrosion material; (2) flue gas after the described cooling is sent into the shell and tube condenser shell side, with the abundant heat exchange of normal-temperature water in the tube side to reclaim its waste heat, the flue gas contact side of pipe bundle condenser all applies anticorrosion material; (3) flue gas condensing liquid converges at condenser by the gravity effect and discharges, and carries out follow-up harmless treatment; (4) heat up in the hot junction that described condensed flue gas is passed to heat-pipe heat exchanger, and the heat-conducting medium in the heat pipe condensation takes place simultaneously and returns the heat pipe cold junction by the gravity flow mode and repeat heat exchange; (5) flue gas after the described intensification is sent into chimney and directly discharging.
The coated anticorrosion material of described heat exchange of heat pipe and pipe bundle condenser flue gas contact side is a graphite.
The temperature of the low temperature flue gas of refuse burning after the described dedusting is 150～200 ℃, and dustiness is lower than 1g/Nm
3
Flue-gas temperature after the described cooling is about 120～130 ℃.
Described condensed flue-gas temperature is about 30～50 ℃.
Flue-gas temperature after the described intensification is about 80～90 ℃.
Heat-conducting medium in the described heat exchange of heat pipe is a demineralized water.
Advantage and good effect that the present invention has are: adopt efficient heat transmission equipment recovery obvious heat of smoke and vapour latent heats such as heat pipe, significantly improve waste heat recovery efficient; Intensity height, good heat conduction effect, graphite material that acidproof ability is strong are coated on the flue gas contact side of equipment, efficiently solve problems such as the cold end corrosion of flue gas of refuse burning and equipment attrition; Temperature raise again after condensed flue gas reclaimed the inlet obvious heat of smoke by heat exchange of heat pipe, and the spontaneous draught capacity of chimney weakens problem to be eliminated, and need not external heat source.Advantages such as the present invention has that flow process is simple, compact conformation, floor space are little, small investment, operating cost are low, thereby development prospect and promotional value are preferably arranged.
Description of drawings
Fig. 1 is the schematic flow sheet of facing of the present invention, and Fig. 2 is a side-looking schematic flow sheet of the present invention.
1, the low-temperature flue gas after the dedusting, 2, heat-pipe heat exchanger, 3, tubular heat exchanger, 4, flue gas condensing liquid, 5, the normal temperature cooling water, 6, hot water.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1 and Fig. 2, the low temperature exhaust heat recovery method of a kind of flue gas of refuse burning of the present invention.
Embodiment 1:
Low-temperature flue gas condition after the dedusting: 150 ℃ of temperature, the about 2g/Nm of dustiness
3, the about 92881Nm of flow
3/ h, moisture content 31%.
Low-temperature flue gas 1 after the dedusting takes the shape of the letter U and flows through whole system.At entrance side, flue gas 1 is recovery section sensible heat after heat pipe 2 cooling at first, and temperature is reduced to 120 ℃, the shell side that enters pipe bundle condenser 3 afterwards with the cigarette temperature drop to dew-point temperature, about 34 ℃.Normal temperature cooling water 5 in the tube side is by corresponding heating and obtain hot water 6.In this process, the waste heat recovery total amount can reach 13MW, and 4 of flue gas condensing liquid are discharged by device bottom.At outlet side, low-temperature flue gas temperature after heat pipe 2 is recovered into oral-lateral flue gas 1 sensible heat raises again, reaches 80 ℃, after chimney discharge smoothly.
Adopt said method to reclaim the gained waste heat and per hour 300 tons of water can be heated to 60 ℃ by 20 ℃, this hot water can be used as the recycling or peripheral resident living heat supply of boiler feedwater.
Embodiment 2:
Low-temperature flue gas condition after the dedusting: 160 ℃ of temperature, the about 1.5g/Nm of dustiness
3, the about 113456Nm of flow
3/ h, moisture content 22%.
Low-temperature flue gas 1 after the dedusting takes the shape of the letter U and flows through whole system.At entrance side, flue gas 1 is recovery section sensible heat after heat pipe 2 cooling at first, and temperature is reduced to 135 ℃, the shell side that enters pipe bundle condenser 3 afterwards with the cigarette temperature drop to dew-point temperature, about 50 ℃.Normal temperature cooling water 5 in the tube side is by corresponding heating and obtain hot water 6.In this process, the waste heat recovery total amount can reach 10MW, and 4 of flue gas condensing liquid are discharged by device bottom.At outlet side, low-temperature flue gas temperature after heat pipe 2 is recovered into oral-lateral flue gas 1 sensible heat raises again, reaches 90 ℃, after chimney discharge smoothly.
Adopt said method to reclaim the gained waste heat and per hour 175 tons of water can be heated to 70 ℃ by 20 ℃, this hot water can be used as the recycling or peripheral resident living heat supply of boiler feedwater.
Embodiment 3:
Low-temperature flue gas condition after the dedusting: 180 ℃ of temperature, the about 1.8g/Nm of dustiness
3, the about 10762Nm of flow
3/ h, moisture content 25%.
Low-temperature flue gas 1 after the dedusting takes the shape of the letter U and flows through whole system.At entrance side, flue gas 1 is recovery section sensible heat behind hot pipe cooling at first, and temperature is reduced to 130 ℃, the shell side that enters pipe bundle condenser 3 afterwards with the cigarette temperature drop to dew-point temperature, about 59 ℃.Normal temperature cooling water 5 in the tube side is by corresponding heating and obtain hot water 6.In this process, the waste heat recovery total amount can reach 8MW, and 4 of flue gas condensing liquid are discharged by device bottom.At outlet side, low-temperature flue gas temperature after heat pipe 2 is recovered into oral-lateral flue gas 1 sensible heat raises again, reaches 85 ℃, after chimney discharge smoothly.
Adopt said method to reclaim the gained waste heat and per hour 182 tons of water can be heated to 60 ℃ by 20 ℃, this hot water can be used as the recycling or peripheral resident living heat supply of boiler feedwater.
The present invention utilizes efficient heat transfer technology recovery flue gas of refuse burning waste heats such as heat pipe, and be used for boiler feedwater or resident living heat supply, have that flow process is simple, investment and plurality of advantages such as operating cost is low, facility compact and heat recovery efficiency height, it is low to be particularly useful for dustiness, content of acid gas height, temperature are not higher than the heat recovery of 200 ℃ low-temperature flue gas.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (7)
1. the low temperature exhaust heat recovery method of a flue gas of refuse burning is characterized in that, comprises the steps:
(1) cold junction that the low temperature flue gas of refuse burning after the dedusting is passed to heat-pipe heat exchanger is lowered the temperature, and the heat-conducting medium while generating gasification in the heat pipe also enters the heat pipe hot junction, and the flue gas contact side of heat exchange of heat pipe all applies anticorrosion material;
(2) flue gas after the described cooling is sent into the shell and tube condenser shell side, with the abundant heat exchange of normal-temperature water in the tube side to reclaim its waste heat, the flue gas contact side of pipe bundle condenser all applies anticorrosion material;
(3) flue gas condensing liquid converges at condenser by the gravity effect and discharges, and carries out follow-up harmless treatment;
(4) heat up in the hot junction that described condensed flue gas is passed to heat-pipe heat exchanger, and the heat-conducting medium in the heat pipe condensation takes place simultaneously and returns the heat pipe cold junction by the gravity flow mode and repeat heat exchange;
(5) flue gas after the described intensification is sent into chimney and directly discharging.
2. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that, the coated anticorrosion material of described heat exchange of heat pipe and pipe bundle condenser flue gas contact side is a graphite.
3. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that the temperature of the low temperature flue gas of refuse burning after the described dedusting is 150～200 ℃, and dustiness is lower than 1g/Nm
3
4. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that the flue-gas temperature after the described cooling is about 120～130 ℃.
5. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that described condensed flue-gas temperature is about 30～50 ℃.
6. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that the flue-gas temperature after the described intensification is about 80～90 ℃.
7. flue gas of refuse burning low temperature exhaust heat recovery method according to claim 1 is characterized in that, the heat-conducting medium in the described heat exchange of heat pipe is a demineralized water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105195597A CN101956986B (en) | 2010-10-26 | 2010-10-26 | Method for recycling low-temperature waste heat from waste incineration fume |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105195597A CN101956986B (en) | 2010-10-26 | 2010-10-26 | Method for recycling low-temperature waste heat from waste incineration fume |
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| Publication Number | Publication Date |
|---|---|
| CN101956986A true CN101956986A (en) | 2011-01-26 |
| CN101956986B CN101956986B (en) | 2012-01-25 |
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|---|---|---|---|
| CN2010105195597A Expired - Fee Related CN101956986B (en) | 2010-10-26 | 2010-10-26 | Method for recycling low-temperature waste heat from waste incineration fume |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213119A (en) * | 2011-04-29 | 2011-10-12 | 赵振海 | Chimney-type air heat-exchange power generation system |
| CN105509067A (en) * | 2016-02-01 | 2016-04-20 | 上海煜工环保科技有限公司 | Typical domestic refuse incineration treatment system |
| CN109550382A (en) * | 2018-12-04 | 2019-04-02 | 北京朗净时代环境科技有限公司 | A kind of desulfuration boiler flue gas purification device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60152893A (en) * | 1984-01-19 | 1985-08-12 | Seishi Gijutsu Kenkyu Kumiai | Waste heat recovery device |
| DE20113189U1 (en) * | 2001-08-09 | 2001-10-25 | Tsai Ming Kun | Plant for the recovery of thermal energy from exhaust gases |
| CN201081559Y (en) * | 2007-06-05 | 2008-07-02 | 天津渤海环保工程有限公司 | Integrated fume cleaning and waste heat recovery device |
| CN201133777Y (en) * | 2007-09-29 | 2008-10-15 | 大连熵立得传热技术有限公司 | Air pre-heating device for high-temperature flue gas |
-
2010
- 2010-10-26 CN CN2010105195597A patent/CN101956986B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60152893A (en) * | 1984-01-19 | 1985-08-12 | Seishi Gijutsu Kenkyu Kumiai | Waste heat recovery device |
| DE20113189U1 (en) * | 2001-08-09 | 2001-10-25 | Tsai Ming Kun | Plant for the recovery of thermal energy from exhaust gases |
| CN201081559Y (en) * | 2007-06-05 | 2008-07-02 | 天津渤海环保工程有限公司 | Integrated fume cleaning and waste heat recovery device |
| CN201133777Y (en) * | 2007-09-29 | 2008-10-15 | 大连熵立得传热技术有限公司 | Air pre-heating device for high-temperature flue gas |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213119A (en) * | 2011-04-29 | 2011-10-12 | 赵振海 | Chimney-type air heat-exchange power generation system |
| CN105509067A (en) * | 2016-02-01 | 2016-04-20 | 上海煜工环保科技有限公司 | Typical domestic refuse incineration treatment system |
| CN109550382A (en) * | 2018-12-04 | 2019-04-02 | 北京朗净时代环境科技有限公司 | A kind of desulfuration boiler flue gas purification device |
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| CN101956986B (en) | 2012-01-25 |
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Granted publication date: 20120125 Termination date: 20121026 |