CN104972682A - Production method and product of energy-saving polytetrafluoroethylene tube used for flue gas afterheat heat exchanger - Google Patents
Production method and product of energy-saving polytetrafluoroethylene tube used for flue gas afterheat heat exchanger Download PDFInfo
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- CN104972682A CN104972682A CN201410135142.9A CN201410135142A CN104972682A CN 104972682 A CN104972682 A CN 104972682A CN 201410135142 A CN201410135142 A CN 201410135142A CN 104972682 A CN104972682 A CN 104972682A
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Abstract
The invention relates to a production method and a product of an energy-saving polytetrafluoroethylene tube used for a flue gas afterheat heat exchanger. The production method of the energy-saving polytetrafluoroethylene tube used for a flue gas afterheat heat exchanger comprises the following steps: screening raw materials, extruding an assistant agent and blending, pushing and extruding, drying, sintering and cooling. A flue gas afterheat heat exchanger produced by adopting the polytetrafluoroethylene tube is compact in structure and small in volume, and therefore, a relatively large heat transfer area can be obtained in a relatively small volume, and the heat transfer capacity of a unit volume is better than that of a metal heat exchanger.
Description
Technical field
The present invention relates to production method and the product of the energy-conservation polyfluortetraethylene pipe of smoke gas afterheat heat exchanger.
Background technology
In the existing fossil-fired unit of China, form the exhaust gas temperature of boiler generally at 125 DEG C to about 150 DEG C, boiler using brown coal is at about 170 DEG C, and high fume temperature is a general phenomenon, causes huge economic loss thus.
Under the macroclimate of current " energy-saving and emission-reduction ", some power plant progressively recognize the energy waste caused due to high fume temperature, start to utilize smoke gas afterheat heat exchanger, make the temperature of flue gas reduce by 40 DEG C to 50 DEG C again, and achieve first-stage success.
At present, smoke gas afterheat heat exchanger pipe is generally metal material.A large amount of SO is produced in power plant soot process
2, SO
3, in smoke evacuation process, exhaust gas temperature is low, part SO
2, SO
3sulfurous acid, sulfuric acid can be formed, smoke gas afterheat heat exchanger metal tube is corroded.Cause flue gas heat-exchange unit short for service life like this, be generally 3-4, the metal tube corroded not easily is changed, and maintenance cost is high.Use the smoke gas afterheat heat exchanger equipment investment of metal tube to reclaim and also need 2-3.So investment return is low after occurring installing smoke gas afterheat heat exchanger, each high-power station is not high to installation flue gas heat-exchange unit enthusiasm.
Polytetrafluoroethylene (PTFE) common name " King ", it has very superior chemical stability and quite high heat endurance, and it can use in the medium such as any acid, alkali, oxidant, solvent extremely strong with corrosivity in the temperature range of-195-260 DEG C.With polyfluortetraethylene pipe as smoke gas afterheat heat exchanger heat exchanger tube, although thermal conductivity factor extremely low (being about stainless 1/100,1/1000 of copper and aluminium), but according to less pipe, wall thickness is very thin, and thermal resistance is little, less scaling, the shortcoming of thermal conductivity factor difference can be compensated.Simultaneously with the smoke gas afterheat heat exchanger of little control, compact conformation volume is little, thus can obtain larger heat transfer area in less volume, and the heat-transfer capability of the unit volume being is better than metallic recuperator.Due to the decay resistance of polytetrafluoroethylene (PTFE) excellence, use polyfluortetraethylene pipe effectively to avoid being corroded at smoke gas afterheat heat exchanger, make smoke gas afterheat heat exchanger can run more than 15 years under full load condition.Use the smoke gas afterheat heat exchanger equipment investment of polyfluortetraethylene pipe to reclaim and generally need 3-5.As can be seen here, use the smoke gas afterheat heat exchanger income phase of polyfluortetraethylene pipe to be greater than 10 years, there is very high investment return and be worth.
In addition, the smoke gas afterheat heat exchanger of polyfluortetraethylene pipe is used also to have the following advantages:
1. smoke gas afterheat heat exchanger can absorb waste heat for heat-setting water from flue gas, improves the efficiency of unit;
2. exhaust gas temperature reduces, and flue gas can be made when entering desulfurizing tower to reach best desulfuration efficiency state, greatly reduces the cooling water consumption in desulfurizing tower.
Summary of the invention
The product using polytetrafluoroethylene (PTFE) pipe production method of the present invention to produce, uses polyfluortetraethylene pipe to replace metal tube, reduces flue gas heat-exchange unit maintenance cost in power-plant flue gas heat exchanger, improves flue gas heat-exchange unit service life.
For realizing aforementioned object, the present invention adopts following technical scheme: the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe, comprises the following steps:
Raw material sifting step, is sieved PTFE dispersion resin by screen cloth;
Extruding adjuvant admixes step, and the PTFE dispersion resin after sieving is admixed extruding adjuvant, places for subsequent use after stirring;
Pre-molding step, makes definite shape by precompression cylinder, can load squeeze cylinder by the PTFE dispersion resin pressure admixing extruding adjuvant;
Pushing extrusion step, loads the material base of pre-molding in squeeze cylinder, releases pushing prefabrication;
Baking step, dries the prefabrication releasing pushing;
Sintering step, puts into sintering furnace by the prefabrication after oven dry and sinters;
Cooling step, by the polyfluortetraethylene pipe quench cooled after sintering.
In described raw material sifting step, the screen cloth of PTFE dispersion resin about 8 orders sieves, and the temperature in this step controls below 19 DEG C.
Described extruding adjuvant is admixed in step, stirs 15-25 minute after admixing extruding adjuvant, places 24 hours at 25-30 DEG C.
In described whipping process, mixer rotating speed is 7rpm.
In described pre-molding step, precompressed pressure used is 4-6Mpa, and precompressed speed is 30mm/min.
In described pre-molding step, the diameter of precompression cylinder should 1-1.5mm less of the diameter of squeeze cylinder.
In described baking step, inlet temperature is set to 130 DEG C, and outlet temperature is set to 280 DEG C.
In described sintering step, sintering furnace inlet temperature is set to 300 DEG C, and outlet temperature is set to 420 DEG C.
In described cooling step, by the polyfluortetraethylene pipe after sintering at cold quenching-in water.
The product using the inventive method to make, can be used as the heat exchanger tube of smoke gas afterheat heat exchanger.
The invention has the beneficial effects as follows: invented a kind of mode of production of flue gas heat-exchange unit polyfluortetraethylene pipe, used this product effectively can improve the service life of flue gas heat-exchange unit, reduce maintenance cost.
Detailed description of the invention
Disclosure sets forth a kind of polytetrafluoroethylene (PTFE) pipe production method being applied in smoke gas afterheat heat exchanger, its production procedure mainly comprise that raw material sieves, admixes extruding adjuvant, pre-molding, pushing are extruded, dry (drying), sintering, cooling.
Production procedure of the present invention is illustrated as:
1. the raw material indication raw material that sieves is PTFE dispersion resin, is sieved by the PTFE dispersion resin being stored in less than 19 DEG C with the screen cloth about 8 orders.Resin should be prevented in operation to be subject to shear action, to avoid resin fibre.
2. admix extruding adjuvant to be added by the PTFE dispersion resin sieved in drying, clean wide-mouth bottle, capacity should not exceed 2/3 of wide-mouth bottle volume, adds extruding adjuvant (calcium stearate or zinc stearate), then covered by lid in resin.Then, be placed on by wide-mouth bottle on mixer and stir 15-25 minute, mixer rotating speed is 7rpm.For making extruding adjuvant fully can penetrate into interlaminar resin, need place 24 hours at 25-30 DEG C.
3. the object of pre-molding pre-molding removes the air admixed in the raw material of adjuvant, and powder compaction is become definite shape can load squeeze cylinder.Precompressed pressure used is 4-6Mpa, and precompressed speed is 30mm/min.The diameter of precompression cylinder should 1-1.5mm less of the diameter of squeeze cylinder.
4. pushing is extruded and is loaded in squeeze cylinder by material base, and allow it force to release pushing prefabrication from mouth mould by the pushing of plunger, in pushing process, PTFE dispersion resin becomes the fibre structure aligned.Bias pressure and adjuvant content, compression ratio are relevant, and adjuvant content increases, compression ratio reduces, and bias pressure declines.
5. dry (drying) pushing adjuvant before reaching sintering temperature in prefabrication should remove.Baking temperature depends on boiling range and the rate of drying of pushing adjuvant, and rate of drying should be not too fast, in order to avoid goods turn to be yellow, longitudinal cracking.Dry porch gets 130 DEG C, and exit generally gets 280 DEG C.
6. sinter PTFE to push prefabricated pipe melting is transparent at a sintering temperature and just become closely knit product afterwards.Sintering furnace temperature is arranged by gradient, and sintering furnace inlet temperature is generally 300 DEG C, and outlet temperature is generally 420 DEG C.Sintering velocity and product wall thickness, diameter, sintering temperature is relevant, should determine by actual conditions.
7. cool PTFE prefabricated pipe at a sintering temperature melting time, crystalline state destroys becomes unformed, but can rearrange formation crystalline state again at cooling procedure Middle molecule chain.The degree of crystallinity of end article is relevant with cooldown rate, and cooldown rate is slower, and degree of crystallinity is higher, and vice versa.Naturally during cooling, degree of crystallinity is 70-80%, is 50% in the degree of crystallinity of cold quenching-in water.Degree of crystallinity is lower, then PTFE tube is more soft, and flexible life is longer.
Utilize the features such as polyfluortetraethylene pipe is corrosion-resistant, high-low temperature resistant, excellent self-cleaning, make it be applied in power-plant flue gas heat exchanger.
Claims (10)
1. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe, is characterized in that, comprise the following steps:
Raw material sifting step, is sieved PTFE dispersion resin by screen cloth;
Extruding adjuvant admixes step, and the PTFE dispersion resin after sieving is admixed extruding adjuvant, places for subsequent use after stirring;
Pre-molding step, makes definite shape by precompression cylinder, can load squeeze cylinder by the PTFE dispersion resin pressure admixing extruding adjuvant;
Pushing extrusion step, loads the material base of pre-molding in squeeze cylinder, releases pushing prefabrication;
Baking step, dries the prefabrication releasing pushing;
Sintering step, puts into sintering furnace by the prefabrication after oven dry and sinters;
Cooling step, by the polyfluortetraethylene pipe quench cooled after sintering.
2. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, it is characterized in that, in described raw material sifting step, the screen cloth of PTFE dispersion resin about 8 orders sieves, and the temperature in this step controls below 19 DEG C.
3. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, it is characterized in that, described extruding adjuvant is admixed in step, stirs 15-25 minute after admixing extruding adjuvant, places 24 hours at 25-30 DEG C.
4. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 3, it is characterized in that, in described whipping process, mixer rotating speed is 7rpm.
5. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, it is characterized in that, in described pre-molding step, precompressed pressure used is 4-6Mpa, and precompressed speed is 30mm/min.
6. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 5, it is characterized in that, in described pre-molding step, the diameter of precompression cylinder should 1-1.5mm less of the diameter of squeeze cylinder.
7. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, it is characterized in that, in described baking step, inlet temperature is set to 130 DEG C, and outlet temperature is set to 280 DEG C.
8. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, it is characterized in that, in described sintering step, sintering furnace inlet temperature is set to 300 DEG C, and outlet temperature is set to 420 DEG C.
9. the smoke gas afterheat heat exchanger production method of energy-conservation polyfluortetraethylene pipe as claimed in claim 1, is characterized in that, in described cooling step, by the polyfluortetraethylene pipe after sintering at cold quenching-in water.
10. use as arbitrary in claim 1 to 9 as described in the product made of method, can be used as the heat exchanger tube of smoke gas afterheat heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135142.9A CN104972682A (en) | 2014-04-04 | 2014-04-04 | Production method and product of energy-saving polytetrafluoroethylene tube used for flue gas afterheat heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135142.9A CN104972682A (en) | 2014-04-04 | 2014-04-04 | Production method and product of energy-saving polytetrafluoroethylene tube used for flue gas afterheat heat exchanger |
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| CN104972682A true CN104972682A (en) | 2015-10-14 |
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|---|---|---|---|
| CN201410135142.9A Pending CN104972682A (en) | 2014-04-04 | 2014-04-04 | Production method and product of energy-saving polytetrafluoroethylene tube used for flue gas afterheat heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023849A (en) * | 2016-02-01 | 2017-08-08 | 北京亚太环保股份有限公司 | A kind of flue gas waste heat utilization device |
Citations (4)
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|---|---|---|---|---|
| CN101597379A (en) * | 2009-04-24 | 2009-12-09 | 曾燕飞 | The making method of the colored raw material band of winding and sintering tetrafluoroethylene |
| CN101642960A (en) * | 2009-09-04 | 2010-02-10 | 曾燕飞 | Preparation method of polytetrafluoroethylene thread seal tape film for communication cable |
| CN101708655A (en) * | 2009-11-24 | 2010-05-19 | 曾燕飞 | Method for manufacturing expanded polytetrafluoroethylene plate |
| CN103481528A (en) * | 2013-09-04 | 2014-01-01 | 湖州森诺氟材料科技有限公司 | Biaxially-oriented porous expanded polytetrafluoroethylene expanded hollow tubular membrane and preparation method thereof |
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2014
- 2014-04-04 CN CN201410135142.9A patent/CN104972682A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597379A (en) * | 2009-04-24 | 2009-12-09 | 曾燕飞 | The making method of the colored raw material band of winding and sintering tetrafluoroethylene |
| CN101642960A (en) * | 2009-09-04 | 2010-02-10 | 曾燕飞 | Preparation method of polytetrafluoroethylene thread seal tape film for communication cable |
| CN101708655A (en) * | 2009-11-24 | 2010-05-19 | 曾燕飞 | Method for manufacturing expanded polytetrafluoroethylene plate |
| CN103481528A (en) * | 2013-09-04 | 2014-01-01 | 湖州森诺氟材料科技有限公司 | Biaxially-oriented porous expanded polytetrafluoroethylene expanded hollow tubular membrane and preparation method thereof |
Non-Patent Citations (1)
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| 于红军: "《工业配件用塑料制品与加工》", 28 February 2003 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023849A (en) * | 2016-02-01 | 2017-08-08 | 北京亚太环保股份有限公司 | A kind of flue gas waste heat utilization device |
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Application publication date: 20151014 |
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