CN112325273A - Gas recycling and heat recycling process and system thereof - Google Patents
Gas recycling and heat recycling process and system thereof Download PDFInfo
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- CN112325273A CN112325273A CN202011214684.7A CN202011214684A CN112325273A CN 112325273 A CN112325273 A CN 112325273A CN 202011214684 A CN202011214684 A CN 202011214684A CN 112325273 A CN112325273 A CN 112325273A
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- heat
- recycling
- dryer
- tail gas
- gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Water Supply & Treatment (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a gas recycling and heat recycling process and a system thereof, wherein the process comprises the following steps: filtering tail gas discharged from a dryer through a filtering device, recovering heat through a heat pipe evaporation section, condensing and dewatering the cooled tail gas through a condensing device, heating the dewatered tail gas through a heat pipe condensation section, pressurizing and preheating the heated tail gas, heating to 120 ℃, and recycling the tail gas to the dryer; the related system comprises an induced draft fan, a condensation dehumidification heat recovery mechanism, an air feeder and a steam heater which are sequentially communicated with an air outlet of the dryer according to the air flow direction. The drying exhaust dehumidification and heat recovery recycling process provided by the invention provides process guidance for drying exhaust dehumidification and heat recovery recycling requirements of different dryers (such as spray dryers, fluidized beds, air flow dryers and the like), so that low-cost recycling of drying exhaust (air or nitrogen) of different dryers becomes possible.
Description
Technical Field
The invention relates to a gas recycling and heat recycling process and a system thereof, belonging to the technical field of gas recycling and heat recycling.
Background
In pharmaceutical and chemical industries, various dryers are used to dry materials. Conventional dryers such as spray dryers, ebullating (fluidized) beds, pneumatic dryers and the like all employ hot air (or nitrogen) for drying, which is typically present in large quantities (typically 5000-3H), high exhaust temperature, high moisture content and complex odor-containing gas components.
At present, the environment-friendly facility is mainly adopted to treat and then is exhausted to the atmosphere, the investment of the environment-friendly facility is large, and the daily operating cost of the environment-friendly facility is high. For nitrogen drying, the cost of nitrogen is 0.7 yuan/Nm3The emission can also cause power after one-time useThe cost is high. If the exhaust of the dryer can be recycled, the environmental protection investment can be reduced, and the environmental protection treatment cost can be saved. In addition, the exhaust temperature of the dryer is high, and heat recovery can be performed by adopting a heat pipe and the like; the main obstacles for the circulation and reuse of the exhaust gas of the existing drying machine are as follows: the moisture content is high and the drying capacity is lost; dust is contained, and the heat exchanger is easy to block. The gas recycling process seen at present mainly adopts a low-temperature condensation dehumidification mode, is recycled after cooling and dehumidification, does not have a heat pipe heat recovery technology, does not have a steam condensation water heat recovery technology, and only adopts a first-stage water meter cooler at 7 ℃. The gas recycling process has the advantages of large 7 ℃ water consumption, large later steam consumption and high recycling cost.
The exhaust temperature of the dryer is 65-70 ℃, and the heat recovery value is high; the steam condensate is discharged to a sewer at the temperature of 80-90 ℃, and also has heat recovery value. The heat recovery technology of the heat pipe heat exchanger and the steam condensate heat exchanger can reduce the consumption of cooling water and steam, thereby reducing the power running cost and leading the gas recycling method to have higher popularization and application values.
Disclosure of Invention
In view of the above, the present invention provides a gas recycling and heat recycling process and a system thereof, which are used for recycling and heat recycling of high-temperature drying exhaust gas (air or nitrogen) discharged from a dryer, so as to solve the technical problem of high cost of the existing gas (air and nitrogen) recycling.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas recycling and heat recycling process comprises the following steps:
1) filtering and dedusting 65-70 ℃ tail gas discharged from the dryer by a filtering device, recovering heat by a heat pipe evaporation section until the gas temperature is 40-45 ℃, reducing the consumption of post-stage condensation dehumidification cold water and saving power cost;
2) condensing the cooled tail gas to 12-15 ℃ through a condensing device to remove water, and recovering stronger drying and dehumidifying capacity of exhaust;
3) the dehydrated tail gas passes through a heat pipe condensation section and is heated to 40-45 ℃, so that the subsequent heating steam amount is saved;
4) pressurizing the heated tail gas to 1500pa, preheating to 43-48 ℃, and recovering the waste heat in the discharged steam condensate;
5) heating the preheated tail gas to 120-130 ℃ and recycling the tail gas to a dryer.
Further, the dryer is any one of a spray dryer, a fluidized bed dryer, and an air flow dryer.
Further, the heating in the step 3) is heating by adopting the heat recovered from the evaporation section of the heat pipe to the condensation section of the heat pipe in the step 1), and external energy is not consumed;
in the step 4), the pressure is increased by a centrifugal fan, and the pressure is 0.005 Mpa;
the preheating in the step 4) is preheating by using waste heat of condensed water discharged by a steam heater;
the heating in the step 5) is heating by a steam heater.
Furthermore, in the process, the circulating air volume of the materials under different humidity can be adjusted in a fan frequency conversion and/or valve adjustment mode.
The invention also provides a gas recycling and heat recycling system formed by the gas recycling and heat recycling process, which is characterized by comprising a draught fan, a condensation and dehumidification heat recycling mechanism, a blower and a steam heater, wherein the draught fan, the condensation and dehumidification heat recycling mechanism, the blower and the steam heater are sequentially communicated with the air outlet of the dryer in the air flow direction;
the air outlet of the steam heater is communicated with the air inlet of the dryer;
the condensing and damp-heat removing recovery mechanism comprises a filtering device, a heat pipe evaporation section, a condensing device, a heat pipe condensation section, a centrifugal fan and a condensate water heat exchanger which are sequentially communicated according to the air flow direction.
Furthermore, the filter device is a G4 grade primary filter and a F5 grade intermediate filter which are sequentially arranged from the tail gas passing direction.
The condensing device is a 25 ℃ circulating water cooler, a plurality of 7 ℃ water coolers and a plurality of M-shaped water collectors which are sequentially arranged in the tail gas passing direction.
Further, the number of the M-shaped water collectors is 2;
the number of 7 degree water surface coolers was 2.
Further, the M-shaped water collector is arranged between the 25 ℃ circulating water cooler and the 7 ℃ water cooler, and between the 7 ℃ water cooler and the heat pipe condensation section.
Further, the water-collecting device also comprises a water baffle which is arranged between the 25 ℃ circulating water cooler and the 7 ℃ water cooler, and/or between the 7 ℃ water cooler and the M-shaped water collector.
The gas recycling and heat recovery process provided by the invention preheats and recovers high-temperature drying exhaust gas and steam condensate. Compared with the prior art, different devices such as the heat pipe are integrated into one unit through the combination of multiple technologies such as the heat pipe, the occupied area is small, and the installation space is saved. The drying exhaust dehumidification and heat recovery recycling process provided by the invention provides process guidance for drying exhaust dehumidification and heat recovery recycling requirements of different dryers (such as spray dryers, fluidized beds, air flow dryers and the like), so that low-cost recycling of drying exhaust of different dryers becomes possible. Meanwhile, the problem of environmental pollution caused by exhaust gas emission of the dryer is solved, and the environmental-friendly investment cost and the daily operation cost of a matched exhaust gas treatment device are saved.
Drawings
FIG. 1 is a flow chart of the gas recycling and heat recovery process of the present invention;
FIG. 2 is a schematic diagram of a gas recycling and heat recovery system;
FIG. 3 is a schematic view of a condensing dehumidifying heat-recovering mechanism 1;
FIG. 4 is a structural view of a condensing dehumidifying heat-recovering mechanism type 2.
In the drawings, the components represented by the respective reference numerals are listed below:
1. draught fan, 2, condensation dehumidification heat recovery mechanism, 3, forced draught blower, 4, steam heater, 5, desiccator, 21, filter equipment, 22, heat pipe evaporation zone, 23, condensing equipment, 24, heat pipe condensation zone, 25, centrifugal fan, 26, the condensate heat exchanger, 211, G4 level primary filter, 212, F5 level intermediate efficiency filter, 231, 25 ℃ circulation water cooler, 232, 7 ℃ water cooler, 233, M type water collector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 of the present invention, the gas recycling and heat recovery process comprises the following steps:
1) filtering and dedusting tail gas at 70 ℃ discharged from the dryer 5 through a filtering device 21, and recovering heat through a heat pipe evaporation section 22 until the gas temperature is 43 ℃;
2) condensing the cooled tail gas to 15 ℃ through a condensing device 23 to remove water;
3) the dehydrated tail gas passes through a heat pipe condensation section 24 and is heated to be more than or equal to 40 ℃;
4) pressurizing the heated tail gas to 1500pa, and preheating to be more than or equal to 45 ℃;
5) the preheated tail gas is pressurized by a blower 3, heated to 120 ℃ by a steam heater 4 and recycled to a dryer 5.
In some embodiments of the invention, the dryer 5 is any one of a spray dryer, a ebullated bed dryer, a pneumatic dryer.
In other embodiments of the present invention, the heating in step 3) is heating by using the heat recovered from the heat pipe evaporation section 22 to the heat pipe condensation section 24 in step 1),
in other embodiments of the present invention, the pressurization in step 4) is performed by a centrifugal fan 25 at a pressure of 0.005 Mpa.
In further embodiments of the present invention, the preheating in step 4) is preheating with a steam heater 4.
In other embodiments of the present invention, the air recycling and heat recycling process adjusts the air circulation volume of the materials with different humidity by means of fan frequency conversion and/or valve adjustment.
In other embodiments of the present invention, as shown in fig. 2 of the present invention, the gas recycling and heat recycling system formed by the gas recycling and heat recycling process includes a draught fan 1, a condensation and dehumidification heat recycling mechanism 2, a blower 3, and a steam heater 4, which are sequentially communicated with the air outlet of the dryer 5 in the air flow direction;
the air outlet of the steam heater 4 is communicated with the air inlet of the dryer 5;
the condensation and moisture removal heat recovery mechanism 2 comprises a filtering device 21, a heat pipe evaporation section 22, a condensing device 23, a heat pipe condensation section 24, a centrifugal fan 25 and a condensate heat exchanger 26 which are sequentially communicated in the air flow direction.
In other embodiments of the present invention, the filtering device 21 is a primary filter 211 of grade G4 and a secondary filter 212 of grade F5, which are sequentially arranged from the exhaust gas passing direction.
In other embodiments of the present invention, the condensing unit 23 is a 25 ℃ circulating water cooler 231, a plurality of 7 ℃ water coolers 231, and an M-type water collector 233, which are sequentially arranged from the tail gas passing direction;
in other embodiments of the present invention, the number of the M-type water collectors 233 is 2.
In other embodiments of the present invention, an M-type water collector 233 is disposed between the 25 ℃ circulating water cooler 231 and the 7 ℃ water cooler 232, and between the 7 ℃ water cooler 232 and the heat pipe condensing section 24.
In other embodiments of the present invention, the number of 7 c water coolers 232 is 2.
In other embodiments of the present invention, the gas recycling and heat recycling system further includes a water baffle, which is disposed between the 25 ℃ circulating water cooler 231 and the 7 ℃ water cooler 232, and/or between the 7 ℃ water cooler 232 and the M-type water collector 233.
In other embodiments of the present invention, as shown in fig. 3 of the present invention, the heat pipe is U-shaped and disposed on the condensation, dehumidification and heat recovery mechanism 2, and the condensation, dehumidification and heat recovery mechanism 2 is a straight pipe type, so that the floor area of the vertical surface is small, and the installation space of the vertical surface is saved.
In other embodiments of the present invention, as shown in fig. 4 of the present invention, the heat pipe is a straight pipe and is disposed on the condensation, dehumidification and heat recovery mechanism 2, and the condensation, dehumidification and heat recovery mechanism 2 is U-shaped, so that the floor space is small, and the installation space of the plane is saved.
Claims (10)
1. A gas recycling and heat recycling process is characterized by comprising the following steps:
1) filtering 65-70 ℃ tail gas discharged from a dryer by a filtering device, and recovering heat by a heat pipe evaporation section until the gas temperature is 40-45 ℃;
2) condensing the cooled tail gas to 12-15 ℃ through a condensing device to remove water;
3) passing the dehydrated tail gas through a heat pipe condensation section and heating to 40-45 ℃;
4) pressurizing the heated tail gas to 1500pa, and preheating to 43-48 ℃;
5) heating the preheated tail gas to 120-130 ℃ and recycling the tail gas to a dryer.
2. The process according to claim 1, wherein the dryer is any one of a spray dryer, a fluidized bed dryer, and a pneumatic dryer.
3. The process of claim 1, wherein the heating in step 3) is heating by heat recovered from the evaporation section of the heat pipe to the condensation section of the heat pipe in step 1);
in the step 4), the pressurization is realized by using a centrifugal fan, and the pressure is 0.005 Mpa;
preheating in the step 4) by using waste heat of condensed water discharged by a steam heater;
in the step 5), the heating is performed by a steam heater.
4. The gas recycling and heat-recovering process according to claim 1, wherein the circulating air volume of the material at different humidity is adjusted by means of fan frequency conversion and/or valve adjustment.
5. A gas recycling and heat recovery system formed by the gas recycling and heat recovery process according to any one of claims 1 to 4, which comprises an induced draft fan, a condensation and dehumidification heat recovery mechanism, a blower and a steam heater which are sequentially communicated with the exhaust outlet of the dryer according to the air flow direction;
the air outlet of the steam heater is communicated with the air inlet of the dryer;
the condensation moisture-removing and heat-recovering mechanism comprises a filtering device, a heat pipe evaporation section, a condensing device, a heat pipe condensation section, a centrifugal fan and a condensate water heat exchanger which are sequentially communicated according to the air flow direction.
6. The system of claim 5, wherein the filter device comprises a primary filter of G4 grade and a secondary filter of F5 grade sequentially arranged from the tail gas passing direction.
7. The gas recycling and heat recycling system according to claim 5, wherein the condensing device is a 25 ℃ circulating water cooler, a plurality of 7 ℃ water coolers, and a plurality of M-type water collectors sequentially arranged from the tail gas passing direction.
8. The gas recycling and heat recovery system of claim 7, wherein the number of M-type water collectors is 2;
the number of the water coolers at the temperature of 7 ℃ is 2.
9. The gas recycling and heat recovery system of claim 8, wherein said M-type water collector is disposed between said 25 ℃ circulating water cooler and said 7 ℃ water cooler, and between said 7 ℃ water cooler and said heat pipe condensing section.
10. The gas recycling and heat recycling system according to any one of claims 7 to 9, further comprising a water baffle plate, wherein the water baffle plate is disposed between the 25 ℃ circulating water cooler and the 7 ℃ water cooler, and/or between the 7 ℃ water cooler and the M-type water collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011214684.7A CN112325273A (en) | 2020-11-04 | 2020-11-04 | Gas recycling and heat recycling process and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011214684.7A CN112325273A (en) | 2020-11-04 | 2020-11-04 | Gas recycling and heat recycling process and system thereof |
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| Publication Number | Publication Date |
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| CN112325273A true CN112325273A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011214684.7A Pending CN112325273A (en) | 2020-11-04 | 2020-11-04 | Gas recycling and heat recycling process and system thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975303A (en) * | 2006-12-30 | 2007-06-06 | 东南大学 | Dithane M-22 Z-78 closed loop circulating drying method and apparatus |
| JP2010255557A (en) * | 2009-04-27 | 2010-11-11 | Minoru Morita | Power generation method using exhaust gas from conductive heat transfer dryer and drying facility having power generation function |
| CN102261828A (en) * | 2011-05-27 | 2011-11-30 | 上海麦风微波设备有限公司 | Energy-saving and environmentally-friendly drying method of coal slime and lignite and device thereof |
| CN202177205U (en) * | 2011-04-22 | 2012-03-28 | 中国石油化工集团公司 | Chemical filter unit for computer air-conditioning system |
| CN206207651U (en) * | 2016-11-28 | 2017-05-31 | 上海朗绿建筑科技股份有限公司 | A kind of new blower fan of Temperature and Humidity Control |
| CN110017666A (en) * | 2019-04-30 | 2019-07-16 | 中冶焦耐(大连)工程技术有限公司 | A kind of method and system of the dry sulphur ammonium of gas closed-circulation |
| CN210663588U (en) * | 2019-08-01 | 2020-06-02 | 润科生物工程（福建）有限公司 | Fluidized bed temperature control dehumidification air inlet device |
-
2020
- 2020-11-04 CN CN202011214684.7A patent/CN112325273A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975303A (en) * | 2006-12-30 | 2007-06-06 | 东南大学 | Dithane M-22 Z-78 closed loop circulating drying method and apparatus |
| JP2010255557A (en) * | 2009-04-27 | 2010-11-11 | Minoru Morita | Power generation method using exhaust gas from conductive heat transfer dryer and drying facility having power generation function |
| CN202177205U (en) * | 2011-04-22 | 2012-03-28 | 中国石油化工集团公司 | Chemical filter unit for computer air-conditioning system |
| CN102261828A (en) * | 2011-05-27 | 2011-11-30 | 上海麦风微波设备有限公司 | Energy-saving and environmentally-friendly drying method of coal slime and lignite and device thereof |
| CN206207651U (en) * | 2016-11-28 | 2017-05-31 | 上海朗绿建筑科技股份有限公司 | A kind of new blower fan of Temperature and Humidity Control |
| CN110017666A (en) * | 2019-04-30 | 2019-07-16 | 中冶焦耐(大连)工程技术有限公司 | A kind of method and system of the dry sulphur ammonium of gas closed-circulation |
| CN210663588U (en) * | 2019-08-01 | 2020-06-02 | 润科生物工程（福建）有限公司 | Fluidized bed temperature control dehumidification air inlet device |
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