CN114674140A - Material drying waste gas cyclic heating utilization method and system - Google Patents
Material drying waste gas cyclic heating utilization method and system Download PDFInfo
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- CN114674140A CN114674140A CN202210362833.7A CN202210362833A CN114674140A CN 114674140 A CN114674140 A CN 114674140A CN 202210362833 A CN202210362833 A CN 202210362833A CN 114674140 A CN114674140 A CN 114674140A
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- waste gas
- gas
- condensable
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- condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a material drying waste gas cyclic heating utilization method and system. According to the invention, after the evaporated waste gas reaches an overheated state through a waste gas superheater, the evaporated waste gas enters a non-condensable gas heater after being dedusted by a filter type deduster, and after part of heat energy is released, the evaporated waste gas enters a waste gas condenser and then low-temperature non-condensable gas is discharged; the low-temperature non-condensable gas is heated by the non-condensable gas heater and then is conveyed to the non-condensable gas treatment equipment through the conveying pipeline under the suction action of the air exhaust fan. The invention makes the generated waste gas exchange heat in two stages, reduces the temperature, releases the condensed water and then heats the condensed water to increase the exhaust temperature of the non-condensable gas, so that the final non-condensable gas reaches the superheated gas, thereby being beneficial to not generating the condensed water in the gas conveying process, ensuring the cleanness and sanitation of the environment and preventing the corrosion of the pipeline.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection, and relates to a method and a system for circularly heating and utilizing material drying waste gas.
Background
In the existing material drying process, such as drying processes of sludge, solid wastes, food and medicine and the like, the generated high-temperature and high-humidity evaporation gas is dedusted and cooled and then is discharged after being burned or deodorized by a boiler, and the cooled non-condensable gas (generally below 45 ℃) is saturated gas and also contains saturated water vapor; when the waste gas is conveyed to waste gas treatment equipment by using a pipeline, a large amount of water is condensed due to the reduction of temperature; especially when drying the mud or harmful material, the water that releases contains the stink, has a poison or has corrosivity, can cause secondary pollution for the environment, if utilize the heat energy of desiccator export high temperature waste gas to heat the noncondensable gas after the condensation, improve the temperature of noncondensable gas, make the noncondensable gas be in the overheated state, when overheated noncondensable gas flows in the pipeline, before the temperature drops to below the saturation temperature, just can not produce the waste water that condenses, will not produce secondary pollution to the environment because of the waste water yet, the corruption influence to the pipeline also can reduce by a wide margin.
Disclosure of Invention
The invention aims to provide a method and a system for recycling, heating and utilizing material drying waste gas. The exhaust temperature of the non-condensable gas is increased by reheating the generated waste gas after the waste gas is subjected to two-stage heat exchange and the temperature is reduced and condensed water is released, so that the final non-condensable gas reaches superheated gas, no condensed water is generated in the gas conveying process, the cleanness and the sanitation of the environment are guaranteed, and the corrosion of a pipeline is prevented.
The invention specifically comprises the following steps:
step one, regulating the temperature of the evaporated waste gas through a waste gas superheater to control the temperature of the waste gas to be in a superheated state of 10 ℃ above the saturation temperature;
step two, the waste gas heated by the waste gas superheater in the step one enters a non-condensable gas heater after being dedusted by a filter type deduster, part of heat energy is released and then enters a waste gas condenser, and a large amount of heat energy released in the waste gas condensation process is absorbed by cooling water, so that the temperature is reduced; after being condensed, water in the waste gas is discharged through a hot end liquid outlet of the waste gas condenser, and low-temperature non-condensable gas is discharged from a hot end gas outlet of the waste gas condenser;
step three, the low-temperature non-condensable gas discharged from the gas outlet at the hot end of the waste gas condenser in the step two is connected to the inlet at the cold end of the non-condensable gas heater, and at the moment, the waste gas dedusted by the filter type deduster in the subsequent step enters the non-condensable gas heater to be used as a heating medium of the low-temperature non-condensable gas discharged after the condensation of the waste gas condenser in the previous step for heat exchange;
and step four, conveying the heated low-temperature non-condensable gas to non-condensable gas treatment equipment through a conveying pipeline under the suction action of an air exhaust fan.
The material drying waste gas cyclic heating method is realized based on the following material drying waste gas cyclic heating utilization system,
the system comprises a waste gas superheater, a dust remover, a non-condensable gas heater, a waste gas condenser and an air exhaust fan;
the waste gas superheater, the non-condensable gas heater and the waste gas condenser are all heat exchangers, a cold end inlet of the waste gas superheater is connected with waste gas generated in the drying process of the dryer, and a hot end of the waste gas superheater is an arbitrary heating device; the outlet of the cold end of the waste gas superheater is connected with a dust remover, the gas outlet of the dust remover is connected with the inlet of the hot end of the non-condensable gas heater, and the dust outlet of the dust remover is connected with the feed inlet of the dryer; the hot end outlet of the non-condensable gas heater is connected with the hot end inlet of the waste gas condenser, the hot end gas outlet of the waste gas condenser is connected with the cold end inlet of the non-condensable gas heater, and water condensed in the waste gas condensation process is discharged from the hot end liquid outlet of the waste gas condenser; the cold end of the waste gas condenser is any refrigerating device; the outlet of the cold end of the non-condensable gas heater is connected with an air exhaust fan.
Preferably, the waste gas superheater is heated by water vapor, a hot end inlet of the waste gas superheater is connected with the water vapor, and condensed water is discharged from a hot end outlet.
Preferably, the waste gas condenser is condensed by condensed water, a cold end inlet of the waste gas condenser is connected with the condensed water, and the condensed water flows out from a cold end outlet.
Preferably, the dust remover is a filter type dust remover.
Drawings
Fig. 1 is a schematic view of the overall structure of a system used in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A large amount of evaporation waste gas can be generated in the process of heating and drying wet materials in a dryer, and a material drying waste gas circulating heating method is realized based on the following material drying waste gas circulating heating utilization system;
as shown in fig. 1, the system includes an exhaust gas superheater 1, a dust remover 2, a non-condensable gas heater 3, an exhaust gas condenser 4, and an air extractor fan 5; waste gas over heater 1, noncondensable gas heater 3, waste gas condenser 4 are the heat exchanger, and waste gas over heater 1 heats through vapor in this embodiment, and waste gas condenser 4 condenses through the condensate water.
The inlet of the cold end of the waste gas superheater 1 is connected with waste gas generated in the drying process of the dryer, the inlet of the hot end of the waste gas superheater 1 is connected with water vapor, and condensed water is discharged from the outlet of the hot end; the outlet of the cold end of the waste gas superheater 1 is connected with a dust remover 2, and the dust remover 2 in the embodiment selects a filtering type dust remover. The air outlet of the dust remover is connected with the hot end inlet of the non-condensable gas heater 3, and the dust outlet of the dust remover is connected with the feed inlet of the dryer. The hot end outlet of the non-condensable gas heater 3 is connected with the hot end inlet of the waste gas condenser 4, the hot end gas outlet of the waste gas condenser 4 is connected with the cold end inlet of the non-condensable gas heater 3, and water condensed in the waste gas condensation process is discharged from the hot end liquid outlet of the waste gas condenser 4. And a cold end inlet of the waste gas condenser 4 is connected with condensate water, and the condensate water flows out from a cold end outlet after condensation. The outlet of the cold end of the non-condensable gas heater 3 is connected with an air exhaust fan 5.
The method specifically comprises the following steps:
step one, the temperature of the evaporated waste gas is adjusted through a waste gas superheater, so that the temperature of the waste gas is controlled to be in a superheated state above the saturation temperature by about 10 ℃, and the normal work of a subsequent filter type dust remover can be guaranteed (no condensation water is generated in the dust removing process, and the dust removing effect is guaranteed).
Step two, the waste gas heated by the waste gas superheater in the step one enters a non-condensable gas heater after being dedusted by a filter type deduster, part of heat energy is released and then enters a waste gas condenser, and a large amount of heat energy released in the waste gas condensation process is absorbed by cooling water, so that the temperature is reduced; a large amount of water in the waste gas is condensed and then discharged through a liquid outlet at the hot end of the waste gas condenser, and a gas outlet at the hot end of the waste gas condenser discharges low-temperature non-condensable gas (water which is not easy to condense in the conveying process).
And step three, the low-temperature non-condensable gas discharged from the gas outlet at the hot end of the waste gas condenser in the step two is connected to the inlet at the cold end of the non-condensable gas heater, and at the moment, the waste gas dedusted by the filter type deduster in the subsequent step enters the non-condensable gas heater to be used as a heating medium of the low-temperature non-condensable gas discharged after the condensation of the waste gas condenser in the previous step for heat exchange.
And step four, the heated low-temperature non-condensable gas is conveyed to non-condensable gas treatment equipment through a conveying pipeline under the suction action of an air exhaust fan.
Claims (5)
1. A material drying waste gas circulation heating method is characterized in that: the method specifically comprises the following steps:
step one, regulating the temperature of the evaporated waste gas through a waste gas superheater to control the temperature of the waste gas to be in a superheated state of 10 ℃ above the saturation temperature;
step two, the waste gas heated by the waste gas superheater in the step one enters a non-condensable gas heater after being dedusted by a filter type deduster, part of heat energy is released and then enters a waste gas condenser, and a large amount of heat energy released in the waste gas condensation process is absorbed by cooling water, so that the temperature is reduced; after being condensed, water in the waste gas is discharged through a liquid outlet at the hot end of the waste gas condenser, and low-temperature non-condensable gas is discharged from a gas outlet at the hot end of the waste gas condenser;
step three, the low-temperature non-condensable gas discharged from the gas outlet at the hot end of the waste gas condenser in the step two is connected to the inlet at the cold end of the non-condensable gas heater, and at the moment, the waste gas dedusted by the filter type deduster in the subsequent step enters the non-condensable gas heater to be used as a heating medium of the low-temperature non-condensable gas discharged after the condensation of the waste gas condenser in the previous step for heat exchange;
and step four, the heated low-temperature non-condensable gas is conveyed to non-condensable gas treatment equipment through a conveying pipeline under the suction action of an air exhaust fan.
2. The material drying exhaust gas circulation heating method according to claim 1, comprising the following material drying exhaust gas circulation heating utilization system, wherein: comprises a waste gas superheater, a dust remover, a non-condensable gas heater, a waste gas condenser and an air exhaust fan;
the waste gas superheater, the non-condensable gas heater and the waste gas condenser are all heat exchangers, waste gas generated in the drying process of the dryer is connected to the inlet of the cold end of the waste gas superheater, and the hot end of the waste gas superheater is provided with any heating device; the outlet of the cold end of the waste gas superheater is connected with a dust remover, the air outlet of the dust remover is connected with the inlet of the hot end of the non-condensable gas heater, and the dust outlet of the dust remover is connected with the feed inlet of the dryer; the hot end outlet of the non-condensable gas heater is connected with the hot end inlet of the waste gas condenser, the hot end gas outlet of the waste gas condenser is connected with the cold end inlet of the non-condensable gas heater, and water condensed in the waste gas condensation process is discharged from the hot end liquid outlet of the waste gas condenser; the cold end of the waste gas condenser is any refrigerating device; the outlet of the cold end of the non-condensable gas heater is connected with an air exhaust fan.
3. The material drying exhaust gas circulation heating utilization system according to claim 2, characterized in that: the waste gas superheater is heated by water vapor, a hot end inlet of the waste gas superheater is connected with water vapor, and condensed water is discharged from a hot end outlet.
4. The material drying exhaust gas circulation heating utilization system according to claim 2, characterized in that: the waste gas condenser is condensed through condensed water, a cold end inlet of the waste gas condenser is connected with the condensed water, and the condensed water flows out from a cold end outlet.
5. The material drying exhaust gas circulation heating utilization system according to claim 2, characterized in that: the dust remover adopts a filter type dust remover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362833.7A CN114674140A (en) | 2022-04-07 | 2022-04-07 | Material drying waste gas cyclic heating utilization method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362833.7A CN114674140A (en) | 2022-04-07 | 2022-04-07 | Material drying waste gas cyclic heating utilization method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114674140A true CN114674140A (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210362833.7A Pending CN114674140A (en) | 2022-04-07 | 2022-04-07 | Material drying waste gas cyclic heating utilization method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114674140A (en) |
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2022
- 2022-04-07 CN CN202210362833.7A patent/CN114674140A/en active Pending
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