CN210601653U - Waste heat recovery system for VOC waste gas incineration - Google Patents
Waste heat recovery system for VOC waste gas incineration Download PDFInfo
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- CN210601653U CN210601653U CN201920796833.1U CN201920796833U CN210601653U CN 210601653 U CN210601653 U CN 210601653U CN 201920796833 U CN201920796833 U CN 201920796833U CN 210601653 U CN210601653 U CN 210601653U
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Abstract
The utility model provides a waste heat recovery system that VOC waste gas burns, include: the incinerator, the burner, the first heat exchange device and the blower; the burner is arranged on the incinerator, and an exhaust port of the incinerator is connected with an air inlet of the first heat exchange device; the first heat exchange device is provided with an air inlet, an air outlet of the air blower is connected with the air inlet, and the air blower conveys air to the first heat exchange device through the air inlet so that the exhaust gas flowing through the first heat exchange device exchanges heat with the air; the first heat exchange device is provided with a first exhaust port which is communicated with an air inlet of the incinerator, and when the air blower operates, the air blower sends air subjected to heat exchange into the incinerator through the first exhaust port to participate in incineration. The utility model discloses can improve VOC exhaust-gas treatment efficiency and waste heat recovery, reduce exhaust emission's harm.
Description
Technical Field
The utility model relates to a waste gas treatment technical field especially relates to a waste heat recovery system that VOC waste gas burns.
Background
Volatile Organic Compounds (VOCs) are common pollutants emitted from petroleum, chemical and Organic solvent sites, and are harmful to human health when in direct contact, and some of the components have been classified as carcinogens. Meanwhile, the VOC organic waste gas also has a certain heat value and is directly discharged without being treated, so that the environment is polluted and energy is wasted. For toxic and harmful VOC which does not need to be recovered or has high recovery difficulty, the incineration speed of non-preheated air is low, the efficiency is low, and the environmental protection index cannot be reached; and the large-flow VOC incineration treatment wastes high-grade heat in a white way if waste heat recovery is not carried out on the incinerated smoke, which is not beneficial to energy conservation.
The energy utilization rate of China is only about 33% at present, which is 10% lower than that of developed countries, and 60-65% of energy in industrial energy is converted into waste heat resources, wherein the low-temperature waste heat with the temperature lower than 350 ℃ accounts for about 60% of the total amount of the waste heat. Therefore, the industrial waste heat recycling is also called as a new energy source, has great energy-saving potential, and becomes an important content of energy-saving and emission-reducing work in China.
SUMMERY OF THE UTILITY MODEL
The utility model provides a waste heat recovery system that VOC waste gas burns solves current VOC exhaust-gas treatment and has the problem of burning incompletely, discharging the unqualified and the energy is extravagant of index, can improve VOC exhaust-gas treatment efficiency, reduces exhaust emission's harm, improves the energy recuperation efficiency among the exhaust emission.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a waste heat recovery system for VOC exhaust incineration comprising: the incinerator, the burner, the first heat exchange device and the blower;
the combustor is arranged on the incinerator and used for carrying out incineration treatment on the VOC waste gas entering the incinerator;
the exhaust port of the incinerator is connected with the air inlet of the first heat exchange device, so that the exhaust gas of the incinerator flows through the first heat exchange device for heat exchange;
the first heat exchange device is provided with an air inlet, an air outlet of the air blower is connected with the air inlet, and the air blower conveys air to the first heat exchange device through the air inlet so that the exhaust gas flowing through the first heat exchange device exchanges heat with the air;
the first heat exchange device is provided with a first exhaust port, the first exhaust port is communicated with the air inlet of the incinerator, and air after heat exchange enters the incinerator through the first exhaust port.
Preferably, the method further comprises the following steps: a second heat exchange means;
the first heat exchange device is provided with a second exhaust port, the first heat exchange device is communicated with an air inlet of the second heat exchange device through the second exhaust port, and the second heat exchange device is used for carrying out secondary heat exchange on exhaust gas flowing through the first heat exchange device.
Preferably, the second heat exchange device comprises: the system comprises an evaporator, an expander, a condenser, a circulating pump and a liquid storage tank;
the evaporator is connected with the expander through a first pipeline, the expander is connected with the condenser through a second pipeline, the condenser is connected with the liquid storage tank through a third pipeline, the liquid storage tank is connected with the circulating pump through a fourth pipeline, and the circulating pump is connected with the evaporator through a fifth pipeline to form a circulating loop;
when the circulating pump operates, the organic working medium in the liquid storage tank circularly operates through a circulating loop;
the evaporator is used for absorbing the heat of the exhaust gas flowing through so as to change the passing organic working medium from liquid state to gas state;
the organic working medium expands in the expander to do work; and the expanded exhaust steam is cooled by a condenser, stored by a liquid storage device and then pressurized and conveyed to the evaporator by the circulating pump to complete a cycle. Preferably, the second heat exchange device further comprises: a preheater;
the preheater is arranged on the fifth pipeline, and the organic working medium flows through the preheater firstly and then enters the evaporator so as to preheat the flowing organic working medium;
the preheater is provided with an air inlet which is communicated with the exhaust gas outlet of the evaporator, so that the exhaust gas flowing through the evaporator further flows through the preheater, exchanges heat with the organic working medium in the preheater to preheat the organic working medium, and then is discharged into a chimney.
Preferably, the second heat exchange device further comprises: and the generator is used for converting kinetic energy expanded in the expander to do work into electric energy.
Preferably, the organic working medium is R1233zd refrigerant or R245fa refrigerant.
Preferably, the incinerator comprises: the furnace comprises a furnace body, a combustion chamber and a heat accumulator;
the furnace body comprises an outer furnace body and an inner furnace body;
the inner furnace body is of a hollow structure and is provided with the combustion chamber, and one or more heat accumulators are paved on the inner wall of the inner furnace body.
Preferably, at least part of the side wall of the inner furnace body is of a porous structure; the outer furnace body covers the outer side of the inner furnace body, an air cavity is formed between the inner wall of the outer furnace body and the outer wall of the inner furnace body, the outer furnace body is provided with an air inlet, and external air enters the air cavity through the air inlet so that an air film cooling layer is formed on the side wall of the inner furnace body.
Preferably, the method further comprises the following steps: the ignition burner comprises an igniter, an auxiliary fuel gas channel and an air channel, and the ignition burner feeds auxiliary fuel and air into the combustion chamber for combustion according to a set proportion through the auxiliary fuel gas channel and the air channel.
Preferably, the combustor anterior segment sets up a plurality of nozzles, and every nozzle all includes VOC exhaust gas channel and air channel for the operation number of nozzle is confirmed according to the combustion temperature in VOC tolerance and the combustion chamber to the staged combustion.
The utility model provides a waste heat recovery system that VOC waste gas burns carries out the heat exchange back through the exhaust gas that will burn burning furnace and first heat transfer device, and the messenger flows through and gets into the burning furnace after first heat transfer device's the air heating and participates in the VOC waste gas and burns, solves current VOC exhaust-gas treatment and has the problem of burning incompletely, discharging the unqualified and energy waste of index, is favorable to VOC to be totally by burning degradation, no longer causes the pollution to the environment.
Further, the utility model discloses still include second heat transfer device to carry out the secondary to the exhaust gas waste heat and retrieve, the waste heat of retrieving can be used for the inflation work power generation, realizes abundant recycle combustion exhaust heat and removes the electricity generation, and energy-conserving effect is showing.
Drawings
Fig. 1 is a schematic view of a waste heat recovery system for VOC exhaust gas incineration provided by the present invention;
fig. 2 is a schematic structural diagram of a waste heat recovery system provided by an embodiment of the present invention;
fig. 3 is a schematic view of an incinerator according to an embodiment of the present invention.
Reference numerals
1 outer furnace body
2 inner furnace body
3 combustion chamber
4 burner
5 ignition burner
6 heat accumulator
7 air inlet
8 air outlet
9 temperature measuring point
12 blower
13 circulating pump
S1 first pipeline
S2 second pipeline
S3 third pipeline
S4 fourth pipeline
S5 fifth pipeline
Detailed Description
In order to make those skilled in the art better understand the solution of the embodiments of the present invention, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and the implementation manner.
To current VOC waste gas burn have the incomplete problem of burning, waste heat utilization ratio is low, the utility model provides a VOC waste gas burns's waste heat recovery system, VOC waste gas get into waste gas and burn burning furnace burning, burn burning furnace and discharge out the waste flue gas through first heat transfer device, carry out the heat exchange with the air of flowing through first heat transfer device, make the air after the heating reentrant burning of participation VOC waste gas in burning furnace. The problems of incomplete incineration, unqualified emission indexes and energy waste in the existing VOC waste gas treatment are solved, the VOC waste gas treatment efficiency can be improved, the harm of waste gas emission is reduced, and the energy recovery efficiency in the waste gas emission is improved.
As shown in fig. 1, a waste heat recovery system for VOC exhaust gas incineration comprises: the incinerator, the combustor, a first heat exchange device and a blower. The combustor is arranged on the incinerator and used for carrying out incineration treatment on the VOC waste gas entering the incinerator. The exhaust port of the incinerator is connected with the air inlet of the first heat exchange device, so that waste flue gas discharged by the incinerator flows through the first heat exchange device for heat exchange. The first heat exchange device is provided with an air inlet, an air outlet of the air blower is connected with the air inlet, and the air blower conveys air to the first heat exchange device through the air inlet so that the discharged waste flue gas flowing through the first heat exchange device is subjected to heat exchange with the air. The first heat exchange device is provided with a first exhaust port, the first exhaust port is communicated with the air inlet of the incinerator, and when the air blower operates, the air after heat exchange is sent into the incinerator through the first exhaust port by the air blower to participate in the incineration of the VOC waste gas.
Specifically, the waste flue gas that discharges that will burn burning furnace emission carries out the heat exchange through first heat transfer device, simultaneously, carry the new trend air through the air-blower to first heat transfer device, the new trend air is heated when passing through first heat transfer device and heaies up to the heat that utilizes to discharge waste flue gas makes the new trend air that gets into in burning furnace and heaies up, is favorable to VOC waste gas to be burnt degradation completely, no longer causes the pollution to the environment, has utilized the waste heat that discharges waste flue gas simultaneously, has reduced energy resource consumption. It should be noted that the first heat exchange device may adopt a high-temperature heat exchanger.
In practical application, as shown in fig. 2, the inlet air of the blower 12 is heated by the first heat exchange device and then enters the burner together with the VOC waste gas and the auxiliary fuel (possibly) to be combusted in the incinerator, and the exhaust gas discharged from the incinerator enters the first heat exchange device to heat the fresh air, so that the temperature of the fresh air entering the incinerator is raised, and the waste heat of the exhaust gas can be effectively utilized.
Further, the system further comprises: a second heat exchange means; the first heat exchange device is provided with a second exhaust port, the first heat exchange device is communicated with an air inlet of the second heat exchange device through the second exhaust port, and the second heat exchange device is used for carrying out secondary heat exchange on the discharged waste flue gas flowing through the first heat exchange device.
In practical application, after the discharged waste gas is subjected to heat exchange through the first heat exchange device, the temperature of the discharged waste gas is still very high, and if the discharged waste gas is directly discharged into the atmosphere, a large amount of energy is wasted. Therefore, the second heat exchange device can be adopted to recover the waste heat of the exhaust gas.
As shown in fig. 2, the second heat exchange device includes: an evaporator, an expander, a condenser, a circulating pump 13 and a liquid storage tank. The evaporator pass through first pipeline S1 with the expander links to each other, the expander pass through second pipeline S2 with the condenser links to each other, the condenser pass through third pipeline S3 with the liquid storage pot links to each other, the liquid storage pot pass through fourth pipeline S4 with the circulating pump links to each other, circulating pump 13 pass through fifth pipeline S5 with the evaporator links to each other to form circulation circuit. When the circulating pump 13 operates, the circulating pump 13 circulates the organic working medium in the liquid storage tank through the circulating loop. The organic working medium absorbs the heat of the exhaust gas flowing through the evaporator, the heat is changed from liquid to gas, the organic working medium expands in the expander to do work, and the expanded exhaust steam is cooled by the condenser, stored by the liquid storage device and then is pressurized by the working medium pump and sent to the evaporator to complete a cycle. Further, the organic working medium is R1233zd refrigerant or R245fa refrigerant. As shown in fig. 2, the refrigerant circulates in the circulation loop through the circulation pump 13, the evaporator makes the liquid refrigerant absorb the heat in the exhaust gas to become a gaseous refrigerant, then the gaseous refrigerant expands in the expander to work and push the generator to convert into electric energy, the expanded exhaust steam is cooled by the condenser, stored in the reservoir and then pressurized by the working medium pump to be sent to the evaporator, a cycle is completed, and further waste heat absorption of the exhaust flue gas is completed. Further, the second heat exchange device further comprises: a preheater; the preheater is arranged on the fifth pipeline, and the organic working medium firstly flows through the preheater and then enters the evaporator so as to preheat the flowing organic working medium. The preheater is provided with an air inlet which is communicated with the exhaust gas outlet of the evaporator, so that the exhaust gas which flows through the evaporator further flows through the preheater, exchanges heat with the organic working medium in the preheater to preheat the organic working medium, and then is discharged into a chimney.
As shown in fig. 2, the evaporator is connected behind the high-temperature preheater, and the flue gas is exhausted to the atmosphere through a chimney after the heat of the flue gas is recovered by the evaporator and the preheater.
The second heat exchange device further comprises: and the generator is used for converting kinetic energy generated by expansion work in the expansion machine into electric energy so as to realize power generation by utilizing waste heat of discharged waste gas.
As shown in fig. 3, the incinerator includes: a furnace body, a combustion chamber 3 and a heat accumulator 6; the furnace body comprises an outer furnace body 1 and an inner furnace body 3; the inner furnace body 2 is of a hollow structure and is provided with the combustion chamber 3, and one or more heat accumulators 6 are laid on the inner wall of the inner furnace body 2.
Further, at least part of the side wall of the inner furnace body 2 is of a porous structure; the outer furnace body 1 covers the outer side of the inner furnace body 2, an air cavity is formed between the inner wall of the outer furnace body and the outer wall of the inner furnace body 2, the outer furnace body is provided with an air inlet 7, and external air enters the air cavity through the air inlet 7, so that an air film cooling layer is formed on the side wall of the inner furnace body. One end of the furnace body is provided with the combustor 4, the other end of the furnace body is provided with an air outlet 8, and external VOC waste gas enters the combustion chamber through an air inlet of the combustor to be incinerated and then is discharged from the air outlet 8. Furthermore, the combustion chamber is also provided with a temperature measuring point 9, and a temperature sensor penetrates through the temperature measuring point 9 to measure the combustion temperature in the combustion chamber.
Specifically, one or more heat accumulators are paved inside the furnace body, the temperature of the combustion chamber is increased through the stored heat of the heat accumulators, the energy consumption is reduced, the waste gas is combusted more sufficiently, and the low-temperature combustion at 900 ℃ is kept in the furnace. The porous structure is arranged on the side wall of the inner furnace body, so that an air film cooling layer is formed in an air cavity formed between the inner furnace body and the outer furnace body, masonry, anchoring and furnace baking of refractory bricks are avoided, and the service life of the incinerator is prolonged. The heat accumulator is made of refractory materials, such as ceramic fibers, is used for heating and storing heat in the furnace, can be made of ceramic fiber refractory bricks and fireproof cotton, and can be designed according to actual needs.
The system further comprises: the ignition burner comprises an igniter, an auxiliary fuel gas channel and an air channel, and the ignition burner feeds auxiliary fuel and air into the combustion chamber for combustion according to a set proportion through the auxiliary fuel gas channel and the air channel.
Further, the combustor anterior segment sets up a plurality of nozzles, and every nozzle all includes VOC exhaust gas channel and air duct for the operation number of nozzle is confirmed according to the combustion temperature in VOC tolerance and the combustion chamber to the staged combustion.
Before the VOC waste gas enters the combustion chamber, auxiliary fuel and air are ignited through the ignition burner, the heat accumulator is heated and stored, the temperature of the combustion chamber is gradually heated to reach a set temperature threshold, and then the VOC waste gas is introduced for incineration. The heat accumulator can not only accumulate heat, but also generate high-temperature reflux, improve the temperature of the root part of the waste gas, facilitate combustion reaction and burnout and ensure the destruction rate.
The utility model provides a waste heat recovery system that VOC waste gas burns carries out the heat exchange back through the exhaust gas that will burn burning furnace and first heat transfer device, makes and gets into burning in burning furnace after first heat transfer device's the new trend air heating of flowing through. The problem of present VOC exhaust-gas treatment have burn incompletely, discharge index is unqualified and the energy is wasted is solved, VOC exhaust-gas treatment efficiency can be improved, exhaust emission's harm is reduced, the energy recuperation efficiency among the exhaust emission is improved.
The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.
Claims (10)
1. The utility model provides a VOC waste gas burns waste heat recovery system which characterized in that includes: the incinerator, the burner, the first heat exchange device and the blower;
the combustor is arranged on the incinerator and used for carrying out incineration treatment on the VOC waste gas entering the incinerator;
the exhaust port of the incinerator is connected with the air inlet of the first heat exchange device, so that the exhaust gas of the incinerator flows through the first heat exchange device for heat exchange;
the first heat exchange device is provided with an air inlet, an air outlet of the air blower is connected with the air inlet, and the air blower conveys air to the first heat exchange device through the air inlet so that the exhaust gas flowing through the first heat exchange device exchanges heat with the air;
the first heat exchange device is provided with a first exhaust port, the first exhaust port is communicated with the air inlet of the incinerator, and air after heat exchange enters the incinerator through the first exhaust port.
2. A VOC exhaust gas incineration waste heat recovery system according to claim 1, further comprising: a second heat exchange means;
the first heat exchange device is provided with a second exhaust port, the first heat exchange device is communicated with an air inlet of the second heat exchange device through the second exhaust port, and the second heat exchange device is used for carrying out secondary heat exchange on exhaust gas flowing through the first heat exchange device.
3. A VOC exhaust gas incinerating waste heat recovery system according to claim 2, wherein the second heat exchanging means comprises: the system comprises an evaporator, an expander, a condenser, a circulating pump and a liquid storage tank;
the evaporator is connected with the expander through a first pipeline, the expander is connected with the condenser through a second pipeline, the condenser is connected with the liquid storage tank through a third pipeline, the liquid storage tank is connected with the circulating pump through a fourth pipeline, and the circulating pump is connected with the evaporator through a fifth pipeline to form a circulating loop;
when the circulating pump operates, the organic working medium in the liquid storage tank circularly operates through a circulating loop;
the evaporator is used for absorbing the heat of the exhaust gas flowing through so as to change the passing organic working medium from liquid state to gas state;
the organic working medium expands in the expander to do work; and the expanded exhaust steam is cooled by a condenser, stored by a liquid storage device and then pressurized and conveyed to the evaporator by the circulating pump to complete a cycle.
4. A VOC exhaust gas incinerating waste heat recovery system according to claim 3, wherein the second heat exchanging means further comprises: a preheater;
the preheater is arranged on the fifth pipeline, and the organic working medium flows through the preheater firstly and then enters the evaporator so as to preheat the flowing organic working medium;
the preheater is provided with an air inlet which is communicated with the exhaust gas outlet of the evaporator, so that the exhaust gas flowing through the evaporator further flows through the preheater, exchanges heat with the organic working medium in the preheater to preheat the organic working medium, and then is discharged into a chimney.
5. A VOC exhaust gas incineration waste heat recovery system as claimed in claim 4, wherein said second heat exchange means further comprises: and the generator is used for converting kinetic energy expanded in the expander to do work into electric energy.
6. A waste heat recovery system for VOC waste gas incineration as claimed in claim 5, wherein the organic working fluid is R1233zd refrigerant or R245fa refrigerant.
7. A VOC exhaust gas incinerating waste heat recovery system according to claim 1, wherein the incinerator comprises: the furnace comprises a furnace body, a combustion chamber and a heat accumulator;
the furnace body comprises an outer furnace body and an inner furnace body;
the inner furnace body is of a hollow structure and is provided with the combustion chamber, and one or more heat accumulators are paved on the inner wall of the inner furnace body.
8. A VOC waste gas incineration waste heat recovery system as claimed in claim 7, characterized in that the inner furnace sidewall is at least partially of a porous structure; the outer furnace body covers the outer side of the inner furnace body, an air cavity is formed between the inner wall of the outer furnace body and the outer wall of the inner furnace body, the outer furnace body is provided with an air inlet, and external air enters the air cavity through the air inlet so that an air film cooling layer is formed on the side wall of the inner furnace body.
9. A VOC exhaust gas incineration waste heat recovery system according to claim 8, further comprising: the ignition burner comprises an igniter, an auxiliary fuel gas channel and an air channel, and the ignition burner feeds auxiliary fuel and air into the combustion chamber for combustion according to a set proportion through the auxiliary fuel gas channel and the air channel.
10. A VOC exhaust gas incineration waste heat recovery system according to any of claims 1 to 9, wherein a plurality of burners are provided at the front section of the burner, each burner includes a VOC exhaust gas channel and an air channel for staged combustion, and the number of operating burners is determined according to the amount of VOC and the combustion temperature in the combustion chamber.
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| CN201920796833.1U CN210601653U (en) | 2019-05-30 | 2019-05-30 | Waste heat recovery system for VOC waste gas incineration |
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| CN201920796833.1U CN210601653U (en) | 2019-05-30 | 2019-05-30 | Waste heat recovery system for VOC waste gas incineration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230820A (en) * | 2019-05-30 | 2019-09-13 | 万泰（苏州）环境科技有限公司 | A kind of residual neat recovering system of VOC burned waste gas |
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2019
- 2019-05-30 CN CN201920796833.1U patent/CN210601653U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230820A (en) * | 2019-05-30 | 2019-09-13 | 万泰（苏州）环境科技有限公司 | A kind of residual neat recovering system of VOC burned waste gas |
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