CN110939940A - Waste gas purification and waste heat recovery method and device thereof - Google Patents
Waste gas purification and waste heat recovery method and device thereof Download PDFInfo
- Publication number
- CN110939940A CN110939940A CN201911247611.5A CN201911247611A CN110939940A CN 110939940 A CN110939940 A CN 110939940A CN 201911247611 A CN201911247611 A CN 201911247611A CN 110939940 A CN110939940 A CN 110939940A
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- Prior art keywords
- heat
- gas
- waste
- rotary
- rto
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/60—Separating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Incineration Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a waste gas purification and waste heat recovery method, which comprises the following steps: s1, removing particulate matters in the printing exhaust gas through a dry filter; s2, enabling the filtered waste gas to enter a heat storage area of a rotary RTO for heating, then enabling the waste gas to enter a combustion chamber for combustion, and enabling most of purified gas after combustion to enter a heat storage body for heat exchange and then discharging; s3, cleaning the heat accumulator by a small part of purified gas and returning the cleaned heat accumulator to the front end; and the other small part of purified gas enters a water-gas heat exchanger to heat circulating water, and the circulating water after heat exchange returns to the front-end water tank again to be heated. The invention also discloses a device suitable for the waste gas purification and waste heat recovery method, which comprises a rotary RTO, a dry filter, a flame arrester, a main fan and a water-gas heat exchanger. The method and the device for purifying waste gas and recovering waste heat greatly reduce the energy consumption in the printing and drying process, effectively utilize the waste heat, and achieve the purposes of reducing the operation cost, reducing the occupied area of equipment and reducing the operation and maintenance difficulty.
Description
Technical Field
The invention relates to a method and a device for purifying waste gas and recovering waste heat, belonging to the technical field of waste gas purification and application research in the packaging and printing industry.
Background
The common techniques for treating waste gas in the packaging and printing industry include washing, activated carbon adsorption, catalytic combustion, photo-oxidative degradation, direct combustion and the like. The concentration of waste gas generated in the packaging and printing industry is low, the components of the waste gas are many, and the working condition change is large, but the process cannot be widely applied due to the reasons of low treatment efficiency, high operating cost, easy generation of a large amount of hazardous wastes and the like.
RTO (Regenerative Thermal Oxidizer, RTO for short), Regenerative Thermal Oxidizer. The principle is that organic waste gas (VOCs) is oxidized into corresponding oxides and water at high temperature, so that the waste gas is purified, the waste gas purification efficiency reaches over 99 percent, and the heat recovery efficiency reaches over 95 percent.
The air reduction and thickening + RTO is widely applied to the printing industry at present. Because a large amount of heat is needed in the printing and drying process, the air reducing and thickening system needs to be provided with devices such as electric heating devices to heat and dry air, and thus, the energy consumption in the printing and drying process is overlarge. The traditional tower-type RTO equipment adopted at present has large floor area, complex investment cost and control and is not beneficial to the operation and maintenance of subsequent equipment, purified gas generated by combustion is not effectively utilized, and the reutilization rate of waste heat is required to be improved.
Disclosure of Invention
The invention aims to provide a waste gas purification and waste heat recovery method, which can effectively utilize the purified gas after combustion and recover the waste heat.
In order to solve the above problems, the technical scheme disclosed by the invention is as follows:
an exhaust gas purification and waste heat recovery method comprises the following steps:
s1, removing the particles in the printing waste gas through a dry filter to ensure the concentration of the particles<5mg/m3；
S2, enabling the filtered waste gas to enter a heat storage area of a rotary RTO (regenerative thermal oxidizer) to be heated in the heat storage area, enabling the heated waste gas to enter a combustion chamber for combustion, enabling most of combustion purified gas to enter a heat storage body to be subjected to heat storage and cooling, and enabling the heat-exchanged purified gas to be collected and discharged into a chimney;
s3, introducing a small part of the burned purified gas into a purging area from a purging pipeline of the rotary RTO to clean the heat accumulator and then returning the cleaned heat accumulator to the front end; taking out another small part of the burned purified gas to enter a water-gas heat exchanger in an oven of the printing machine to heat circulating water, returning the circulating water after heat exchange to the front-end water tank again to heat,
s4, the rotary valve rotating the RTO controls and switches among the heat accumulation area, the purging area and the heat release area, and the steps S2 and S3 are repeated.
The invention also discloses a device suitable for the waste gas purification and waste heat recovery method, which comprises a rotary RTO, a dry filter, a flame arrester, a main fan and a water-gas heat exchanger,
the rotary RTO is provided with a regenerator, a combustion chamber and a purging pipeline positioned in the middle, a rotary valve is arranged in the rotary RTO,
the bottom of the rotary RTO is provided with an air inlet, an air outlet and a blowing air circulation port, the air inlet is connected with an air inlet pipeline, the dry filter, the flame arrester and the main fan are sequentially arranged on the air inlet pipeline, the air outlet is connected with an exhaust pipeline,
the upper end of the rotary RTO is provided with a hot gas outlet connected with the combustion chamber, the hot gas outlet is connected with an exhaust pipeline through a waste heat recovery pipeline, the water-gas heat exchanger is arranged on the waste heat recovery pipeline,
a circulating pipeline is connected between the blowing air circulating port and the dry filter,
the rotary valve is used for switching the heat storage area, the purging area and the heat release area.
Further, the hydrothermal heat exchanger is a tubular heat exchanger.
Further, the rotary valve used in the regenerative incinerator disclosed in application No. 201810825244.1 was used.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the rotary RTO to carry out combustion treatment on the air-reduced waste gas, and part of heat generated by combustion supplies heat to the RTO, and is discharged after heat exchange in the heat storage area. One part of the redundant heat heats circulating water through the hydrothermal heat exchanger to heat and dry gas for the printing machine, and the other part cleans a bed layer of a cleaning area of the heat storage bed layer, so that the treatment efficiency is improved. The method and the device greatly reduce the energy consumption in the printing and drying process and effectively utilize the waste heat. The purposes of reducing the system operation cost, reducing the equipment floor area, reducing the investment cost and reducing the operation and maintenance difficulty are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. The objects, aspects and advantages of the present invention will become more apparent from the following description. It should be understood that the described embodiments are preferred embodiments of the invention, and not all embodiments.
Referring to fig. 1, a method for purifying exhaust gas and recovering waste heat includes the following steps:
s1, removing the particles in the printing waste gas through a dry filter to ensure the concentration of the particles<5mg/m3；
S2, enabling the filtered waste gas to enter a heat storage area of a rotary RTO (regenerative thermal oxidizer) to be heated in the heat storage area, enabling the heated waste gas to enter a combustion chamber for combustion, enabling most of combustion purified gas to enter a heat storage body to be subjected to heat storage and cooling, and enabling the heat-exchanged purified gas to be collected and discharged into a chimney 5;
s3, introducing a small part of the burned purified gas into a purging area from a purging pipeline of the rotary RTO to clean the heat accumulator and then returning the cleaned heat accumulator to the front end; taking out another small part of the burned purified gas to enter a water-gas heat exchanger in an oven of the printing machine to heat circulating water, returning the circulating water after heat exchange to the front-end water tank again to heat,
s4, the rotary valve rotating the RTO controls and switches among the heat accumulation area, the purging area and the heat release area, and the steps S2 and S3 are repeated.
The invention also discloses a device suitable for the waste gas purification and waste heat recovery method, which comprises a rotary RTO1, a dry filter 2, a flame arrester 3, a main fan 4 and a water-gas heat exchanger 6 in an oven of a printing machine. The hydrothermal heat exchanger is a tubular heat exchanger.
The rotary RTO1 has a regenerator 10, a combustion chamber 11 and a centrally located purge line 12, and a rotary valve 8 is mounted in a rotary RTO 1.
The bottom of rotatory RTO1 is equipped with air inlet 13, gas vent 14 and sweeps wind circulation mouth 15, air inlet 13 is connected air inlet pipeline a, dry-type filter 2, spark arrester 3 and main fan 4 are installed on air inlet pipeline a in proper order, gas vent 14 is connected with exhaust pipe b, and chimney 5 is connected to exhaust pipe b's other one end. The upper end of the rotary RTO1 is provided with a natural gas inlet 7 and a hot gas outlet 16 connected with the combustion chamber 11, the hot gas outlet 16 is connected with an exhaust pipeline b through a waste heat recovery pipeline c, the water-gas heat exchanger 6 is arranged on the waste heat recovery pipeline c, an arrow below the water-gas heat exchanger 6 in the figure indicates that cold water enters, and an arrow above the water-gas heat exchanger indicates that hot water leaves. And a circulating pipeline d is connected between the blowing air circulating port 15 and the dry filter 2, and the rotary valve 8 is used for switching the heat storage area, the blowing area and the heat release area.
The rotary valve 8 is preferably a rotary valve of a regenerative thermal oxidizer disclosed in application No. 201810825244.1, which is quick and flexible in response and is advantageous in improving the treatment efficiency of a rotary RTO apparatus.
The invention adopts the rotary RTO to carry out combustion treatment on the air-reduced waste gas, and part of heat generated by combustion supplies heat to the RTO, and is discharged after heat exchange in the heat storage area. One part of the redundant heat heats circulating water through the hydrothermal heat exchanger to heat and dry gas for the printing machine, and the other part cleans a bed layer of a cleaning area of the heat storage bed layer, so that the treatment efficiency is improved. The method and the device greatly reduce the energy consumption in the printing and drying process and effectively utilize the waste heat. The purposes of reducing the system operation cost, reducing the equipment floor area, reducing the investment cost and reducing the operation and maintenance difficulty can be achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and it is obvious that any person skilled in the art can easily conceive of alternative or modified embodiments based on the above embodiments and these should be covered by the present invention.
Claims (4)
1. A method for purifying waste gas and recovering waste heat is characterized by comprising the following steps:
s1, removing the particles in the printing waste gas through a dry filter to ensure the concentration of the particles<5mg/m3；
S2, enabling the filtered waste gas to enter a heat storage area of a rotary RTO (regenerative thermal oxidizer) to be heated in the heat storage area, enabling the heated waste gas to enter a combustion chamber for combustion, enabling most of combustion purified gas to enter a heat storage body to be subjected to heat storage and cooling, and enabling the heat-exchanged purified gas to be collected and discharged into a chimney;
s3, introducing a small part of the burned purified gas into a purging area from a purging pipeline of the rotary RTO to clean the heat accumulator and then returning the cleaned heat accumulator to the front end; taking out another small part of the burned purified gas to enter a water-gas heat exchanger in an oven of the printing machine to heat circulating water, returning the circulating water after heat exchange to the front-end water tank again to heat,
s4, the rotary valve rotating the RTO controls and switches among the heat accumulation area, the purging area and the heat release area, and the steps S2 and S3 are repeated.
2. An apparatus suitable for the exhaust gas purification and waste heat recovery method according to claim 1, wherein:
comprises a rotary RTO, a dry filter, a flame arrester, a main fan and a water-gas heat exchanger,
the rotary RTO is provided with a regenerator, a combustion chamber and a purging pipeline positioned in the middle, a rotary valve is arranged in the rotary RTO,
the bottom of the rotary RTO is provided with an air inlet, an air outlet and a blowing air circulation port, the air inlet is connected with an air inlet pipeline, the dry filter, the flame arrester and the main fan are sequentially arranged on the air inlet pipeline, the air outlet is connected with an exhaust pipeline,
the upper end of the rotary RTO is provided with a hot gas outlet connected with the combustion chamber, the hot gas outlet is connected with an exhaust pipeline through a waste heat recovery pipeline, the water-gas heat exchanger is arranged on the waste heat recovery pipeline,
a circulating pipeline is connected between the blowing air circulating port and the dry filter,
the rotary valve is used for switching the heat storage area, the purging area and the heat release area.
3. The apparatus for exhaust gas purification and waste heat recovery method according to claim 2, wherein:
the hydrothermal heat exchanger is a tubular heat exchanger.
4. The apparatus for exhaust gas purification and waste heat recovery method according to claim 2, wherein:
the rotary valve used was the rotary valve of the regenerative incinerator disclosed in application No. 201810825244.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247611.5A CN110939940A (en) | 2019-12-09 | 2019-12-09 | Waste gas purification and waste heat recovery method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247611.5A CN110939940A (en) | 2019-12-09 | 2019-12-09 | Waste gas purification and waste heat recovery method and device thereof |
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| Publication Number | Publication Date |
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| CN110939940A true CN110939940A (en) | 2020-03-31 |
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| CN201911247611.5A Pending CN110939940A (en) | 2019-12-09 | 2019-12-09 | Waste gas purification and waste heat recovery method and device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911941A (en) * | 2020-08-07 | 2020-11-10 | 华夏碧水环保科技有限公司 | Comprehensive utilization system for waste gas treatment heat energy |
| CN115247801A (en) * | 2021-12-30 | 2022-10-28 | 恩希爱（杭州）薄膜有限公司 | Regenerative combustion apparatus and method |
| CN116182169A (en) * | 2023-02-13 | 2023-05-30 | 苏州天迎蓝智能环保科技有限公司 | Plunger heat accumulating type waste gas incinerator |
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| CN209569740U (en) * | 2018-12-29 | 2019-11-01 | 江苏天祺环保科技有限公司 | A kind of rto waste heat recycling storage equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116182169A (en) * | 2023-02-13 | 2023-05-30 | 苏州天迎蓝智能环保科技有限公司 | Plunger heat accumulating type waste gas incinerator |
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Application publication date: 20200331 |