CN111649343B - Efficient low-nitrogen VOC waste gas incinerator and incineration method - Google Patents
Efficient low-nitrogen VOC waste gas incinerator and incineration method Download PDFInfo
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- CN111649343B CN111649343B CN202010573238.9A CN202010573238A CN111649343B CN 111649343 B CN111649343 B CN 111649343B CN 202010573238 A CN202010573238 A CN 202010573238A CN 111649343 B CN111649343 B CN 111649343B
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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
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
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Abstract
The invention discloses a high-efficiency low-nitrogen VOC waste gas incinerator and an incineration method, the incinerator comprises an incinerator body and burners, an inlet of the incinerator body is hermetically connected with an end plate, a VOC waste gas cavity and a secondary air cavity which are mutually separated are arranged between the end plate and the burners, the VOC waste gas cavity is communicated with one end of a plurality of injection tube bundles, the other ends of the plurality of injection tube bundles penetrate through the end plate and extend into a hearth, the penetration part of the injection tube bundles and the end plate is sealed, a waste gas inlet is formed in the VOC cavity, the secondary air cavity is communicated with the hearth through a plurality of air nozzles in the end plate, an air inlet is formed in the secondary air cavity, and outlet ends of the burners penetrate through the VOC waste gas cavity, the secondary air cavity and the end plate and extend into the hearth. The invention can effectively reduce the emission of NOx after the waste gas is burnt, improve the burning efficiency and save the cost.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a high-efficiency low-nitrogen VOC waste gas incinerator and an incineration method.
Background
Volatile Organic Compounds (VOCs) are common pollutants emitted from petroleum, chemical and Organic solvent-using sites. Xylene, toluene, methyl ethyl ketone, halogen compounds and the like in VOC waste gas belong to toxic and pungent odor gas, and part of the toxic and pungent odor gas is listed as carcinogen, so that the direct contact of the toxic and pungent odor gas can cause harm to human health. The VOC exhaust gas, if discharged directly without treatment, will pollute the environment.
In the VOC waste gas generated in some industries (such as the coal chemical industry), the amount of waste gas is large, the types of VOC waste gas are many, the VOC components of each type of waste gas are very complex, the VOC content difference is very large, meanwhile, the flow rate and the corresponding heat value of each type of waste gas are very different, and the oxygen content in the waste gas is also very low. Aiming at the application, the invention specially designs a high-efficiency low-NOx-emission incinerator for treating various types of VOC waste gas and even organic waste liquid.
Disclosure of Invention
The invention aims to provide a high-efficiency low-nitrogen VOC waste gas incinerator and an incineration method, which are used for reducing the emission of NOx and improving the treatment efficiency during the treatment of VOC waste gas.
In order to solve the technical problem, the invention adopts the following scheme:
the utility model provides a high-efficient low-nitrogen VOC waste gas burns burning furnace, is including burning.
By adopting the technical scheme, the burner is used for burning to heat the hearth in advance, secondary air is sprayed into the hearth through different air nozzles on the end plate to form flameless combustion, NOx generated in the burning process of VOC waste gas is effectively inhibited, the VOC waste gas enters the hearth through the spray pipe bundles, stays for a period of time in the high-temperature hearth of the incinerator body, VOC organic components in the waste gas are oxidized and cracked into harmless CO2 and H2O under the high-temperature condition of the hearth to be discharged, the plurality of spray pipe bundles and the air nozzles ensure that the VOC waste gas and the secondary air are uniformly mixed in the hearth, the VOC waste gas and the secondary air are cracked at high temperature on the whole section of the hearth and release heat, a high-temperature section of the incinerator is close to an inlet end, the average temperature of the hearth is effectively improved, the treatment efficiency of the VOC waste gas is improved, and the CO concentration in the waste gas at the outlet of the incinerator is reduced.
Furthermore, as the preferred, a plurality of the air spout is concentric ring shape evenly distributed on the end plate, and a plurality of the injection tube bank is concentric ring shape evenly distributed at VOC waste gas cavity terminal surface, and ring shape distribution air spout and injection tube bank evenly crisscross set up.
Owing to adopt above-mentioned technical scheme, it is a plurality of air spout and injection tube bank are concentric ring form evenly distributed, and air spout and injection tube bank are even crisscross to be set up for VOC waste gas and secondary air can quick homogeneous mixing in furnace, have so both prevented to appear obvious flame in the furnace and have aroused local high temperature and produce a large amount of NOx, simultaneously, let furnace high-temperature section maintain in the place that is close to burning furnace body entrance side again, guarantee VOC's efficiency of getting rid of.
Preferably, the rear end of the incinerator body is provided with a waste gas heat exchanger, a secondary air heat exchanger and a waste heat boiler, the inlet end of the waste gas heat exchanger is communicated with a waste gas pipeline, the outlet end of the waste gas heat exchanger is communicated with a waste gas inlet of the VOC waste gas cavity through a pipeline, the secondary air heat exchanger is provided with a secondary air inlet, and the outlet of the secondary air heat exchanger is communicated with an air inlet of the secondary air cavity through a pipeline.
By adopting the technical scheme, the waste gas heat exchanger and the secondary air heat exchanger are arranged at the rear end of the incinerator to respectively carry out heat exchange treatment on the VOC waste gas and the secondary air, the heat of the high-temperature waste gas is effectively utilized in the incinerator by the double heat exchange mode, the consumption of high-calorific-value fuel is saved, the system operating cost is saved, the high-temperature waste gas flows out of the air heat exchanger after the temperature of the high-temperature waste gas is reduced, and the waste heat boiler can be set to further recover the heat of the high-temperature waste gas based on actual design parameters.
Preferably, the incinerator body is provided with a temperature measuring point in the hearth, a temperature sensor is arranged, and the combustion temperature in the hearth is measured through the temperature sensor; adjusting the injection amount of high-heat value fuel according to the feedback temperature value of the hearth
Further, preferably, the rear end of the incinerator body is also provided with an oxygen content analyzer; the secondary air quantity is adjusted through the real-time oxygen content measured by the rear-end oxygen content analyzer, so that enough oxygen content in the hearth is ensured to meet the requirement of oxidative cracking of VOC (volatile organic compounds) in waste gas and high-calorific-value fuel in the high-temperature environment of the hearth.
Preferably, the burner is provided with a fuel inlet and a combustion-supporting air inlet which are communicated with an external high-calorific-value fuel pipeline and are used for feeding the high-calorific-value fuel and the combustion-supporting air into the hearth of the incineration body according to a set proportion for combustion.
Preferably, the tail end of the high calorific value fuel pipeline is communicated with the fuel inlet of the burner and the waste gas inlet of the VOC waste gas cavity, a first cut-off valve is arranged between the high calorific value fuel pipeline and the fuel inlet of the burner, and a second cut-off valve is arranged between the high calorific value fuel pipeline and the VOC waste gas cavity.
By adopting the technical scheme, when the heat generated by the high-temperature pyrolysis of the VOC in the waste gas is not enough to maintain the temperature of the hearth, a certain amount of high-heat-value fuel can be supplemented into the VOC waste gas, in order to prevent the high-temperature flame burnt by the burner from generating a large amount of NOx, when the temperature of the hearth is higher than 800 ℃, the first cut-off valve in front of the burner is closed, the second cut-off valve in front of the VOC waste gas cavity is opened, the high-heat-value fuel is directly sprayed into the VOC waste gas cavity and mixed with the VOC waste gas, and then the high-heat-value fuel is sprayed into the hearth, mixed with the secondary air, subjected to oxidative cracking at high temperature and releases heat.
A method of incinerating VOC exhaust gas with high efficiency and low nitrogen, using the incinerator of any preceding claim, and comprising the steps of:
s1: the burner burns high-calorific-value fuel to heat the hearth of the incinerator body; the high-calorific-value fuel is combusted by a burner to heat the hearth, and the ratio of the high-calorific-value fuel to the combustion air is adjusted by adopting a double-cross amplitude limiting control mode.
S2: when the temperature of the hearth reaches 800 ℃, introducing VOC waste gas and secondary air, and respectively entering a VOC waste gas cavity and a secondary air cavity at the inlet end of the incinerator body after the VOC waste gas and the secondary air are subjected to heat exchange through a waste gas heat exchanger and a secondary air heat exchanger;
s3: after heat exchange, secondary air enters a secondary cavity, and is sprayed into a hearth of the incinerator body through secondary air nozzles uniformly distributed on an incinerator end plate, VOC waste gas after heat exchange enters a VOC waste gas cavity and is uniformly sprayed into the hearth of the incinerator through a spray pipe bundle, and the VOC waste gas and the secondary air are quickly and uniformly mixed in the hearth;
s4: when the heat generated by the high-temperature cracking of the VOC waste gas is not enough to maintain the temperature of the hearth, the first cut-off valve is closed, the second cut-off valve is opened, so that high-calorific-value fuel is directly sprayed into the VOC waste gas cavity and mixed with the VOC waste gas, and then is sprayed into the hearth to be mixed with secondary air, and is subjected to oxidative cracking at high temperature and releases heat;
S5: adjusting the spraying amount of the high-heat-value fuel according to the temperature value fed back by the temperature sensor in the hearth, and adjusting the secondary air amount through the real-time oxygen content measured by the rear-end oxygen content analyzer; the oxygen content measured by the oxygen content analyzer behind the heat exchanger corrects the gas/air ratio in real time, and prevents the system danger caused by the fuel excess due to the change of the components of the high-heat value mixed fuel.
The invention has the following beneficial effects:
1. the air nozzle and the jet pipe bundle on the end plate of the incinerator are uniformly and alternately arranged, so that the VOC waste gas and the secondary air are rapidly and uniformly mixed in a blast furnace hearth, and are rapidly pyrolyzed at the whole cross section of the hearth and release heat, the high-temperature section of the incinerator is close to the inlet end, the average temperature of the hearth is effectively improved, the treatment efficiency of the VOC waste gas is improved, and the CO concentration in the outlet waste gas of the incinerator is reduced.
2. The conventional burner is adopted to heat the hearth, high-calorific-value fuel of the burner is cut off in the actual operation stage, the high-calorific-value fuel is directly sprayed into VOC waste gas and then is sprayed into the hearth through different channels with secondary air, flameless combustion is formed, and NOx generated in the burning process of the VOC waste gas is effectively inhibited.
3. The waste gas heat exchanger and the secondary air heat exchanger are arranged at the rear end of the incinerator to respectively exchange heat for VOC waste gas and secondary air, and the double heat exchange mode enables heat of high-temperature waste gas to be effectively utilized in the incinerator, so that consumption of high-calorific-value fuel is reduced, and system operating cost is saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the cross-sectional structure a-a in fig. 1.
Reference numerals: 1-burner, 2-jet tube bundle, 3-first cut-off valve, 4-second cut-off valve, 5-VOC waste gas cavity, 6-secondary air cavity, 7-incinerator body, 8-waste gas heat exchanger, 9-secondary air heat exchanger, 10-oxygen analyzer, 11-high-heat value fuel pipeline, 12-air nozzle, 13-combustion air inlet, 14-fuel inlet, 15-waste gas inlet, 16-air inlet, 17-secondary air inlet, 18-end plate and 19-hearth.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or that are conventionally placed when the product of the present invention is used, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in figures 1 and 2, a high-efficiency low-nitrogen VOC waste gas incinerator comprises an incinerator body 7 and a burner 1, wherein the burner 1 is provided with a fuel inlet 14 and a combustion air inlet 13 which are communicated with an external high-heat value fuel pipeline 11 and are used for feeding high-heat value fuel and combustion air into a hearth 19 of the incinerator body 7 according to a set proportion for combustion, the inlet of the incinerator body 7 is hermetically connected with an end plate 18, a VOC waste gas cavity 5 and a secondary air cavity 6 which are mutually separated are arranged between the end plate 18 and the burner 1, so that VOC waste gas and secondary air cannot be mixed, a waste gas inlet 15 for waste gas to enter is arranged on the VOC waste gas cavity 5, an air inlet 16 for external air to enter is arranged on the secondary air cavity 6, the VOC waste gas cavity 5 is communicated with one end of a plurality of injection tube bundles 2 in a welding manner, the plurality of injection tube bundles 2 are uniformly distributed on the end surface of the VOC cavity 5 in a concentric circular ring shape and are hermetically communicated with the VOC cavity 5, the other ends of the plurality of injection tube bundles 2 sequentially penetrate through the secondary air cavity 6 and the end plate 18 and extend into the hearth 19, so that VOC waste gas can uniformly enter the hearth 19, the penetration part of the injection tube bundles 2 and the end plate 18 is sealed, the waste gas cannot leak into the secondary air cavity 6, the secondary air cavity 6 is communicated with the hearth 19 through a plurality of air nozzles 12 on the end plate 18, the outlet end of the burner 1 sequentially penetrates through the VOC waste gas cavity 5, the secondary air cavity 6 and the end plate 18 and extends into the hearth 19, the burner 1 is used for carrying out combustion to advance temperature rise on the hearth 19, secondary air is sprayed into the hearth 19 through different air nozzles 12 on the end plate 18 to form flameless combustion, NOx generated in the burning process of the VOC waste gas is effectively inhibited, the VOC waste gas enters the hearth 19 through the injection tube bundles 2 and stays in the high-temperature hearth 19 of the incinerator tube bundle body 1 for a period of time, and VOC organic components in the VOC waste gas are oxidized and cracked into harmless CO2 and H2O under the high-temperature condition of the hearth 19 to be discharged, a plurality of air spout 12 are concentric ring shape evenly distributed on end plate 18, ring shape distribution air spout 12 and the even crisscross setting of injection tube bank 2, make VOC waste gas and secondary air can quick homogeneous mixing in furnace 19, so both prevented appearing obvious flame in furnace 19 and arousing local high temperature and produce a large amount of NOx, and simultaneously, let furnace 19 high-temperature segment maintain in the place that is close to burn burning furnace body 7 entrance side again, guarantee VOC's removal efficiency and guarantee VOC waste gas and secondary air misce bene in furnace 19, pyrolysis and release heat on furnace 19 whole cross-section, the high-temperature segment that makes to burn burning furnace is close to the entry end, effectively improved furnace 19's average temperature, the treatment effeciency of VOC waste gas is improved, CO concentration in the burning furnace export waste gas has been reduced.
Example 2
In addition to the above embodiments, as shown in fig. 1, a waste gas heat exchanger 8, a secondary air heat exchanger 9 and a waste heat boiler are installed at the rear end of the incinerator body 7, the inlet end of the waste gas heat exchanger 8 is communicated with a waste gas pipeline, the outlet end thereof is communicated with a waste gas inlet 15 of the VOC waste gas cavity 5 through a pipeline, the secondary air heat exchanger 9 is provided with a secondary air inlet 17, and the outlet of the secondary air heat exchanger 9 is communicated with an air inlet 16 of the secondary air cavity 6 through a pipeline; the waste gas heat exchanger 8 and the secondary air heat exchanger 9 are arranged at the rear end of the incinerator to respectively exchange heat for VOC waste gas and secondary air, the heat of high-temperature waste gas is effectively utilized in the incinerator by the double heat exchange mode, the consumption of high-calorific-value fuel is reduced, the system operating cost is saved, the high-temperature waste gas flows out of the air heat exchanger after the temperature of the high-temperature waste gas is reduced, and the waste heat boiler can be arranged to further recover the heat of the high-temperature waste gas based on actual design parameters.
Example 3
On the basis of the above embodiment, there are temperature measuring points in the furnace 19 of the incinerator body 7, and a temperature sensor, not shown, is provided, and the combustion temperature in the furnace is measured by the temperature sensor; adjusting the injection amount of high-heat value fuel according to the feedback temperature value of the hearth
Example 4
In addition to the above embodiments, as shown in fig. 1, an oxygen content analyzer 10 is further installed at the rear end of the incinerator body 7; the secondary air amount is adjusted through the real-time oxygen content measured by the rear-end oxygen content analyzer 10, so that enough oxygen content in the hearth 19 is ensured to meet the requirement of the oxidative cracking of VOC components in the waste gas and high-heat-value fuel in the high-temperature environment of the hearth 19.
The burner 1 is provided with a fuel inlet 14 and a combustion-supporting air inlet 13 which are communicated with an external high-calorific-value fuel pipeline 11 and are used for feeding the high-calorific-value fuel and the combustion-supporting air into a hearth 19 of the incineration body 7 according to a set proportion for combustion.
The tail end of the high calorific value fuel pipeline 11 is simultaneously communicated with a fuel inlet 14 of the burner 1 and a waste gas inlet 15 of the VOC waste gas cavity 5, a first cut-off valve 3 is arranged between the high calorific value fuel pipeline 11 and the fuel inlet 14 of the burner 1, a second cut-off valve 4 is arranged between the furnace hearth and the waste gas inlet 15 of the VOC waste gas cavity 5, when the heat generated by the pyrolysis of VOC in the waste gas is not enough to maintain the temperature of the furnace hearth, a certain amount of high-heating-value fuel can be supplemented into the VOC waste gas, in order to prevent the high-temperature flame combusted by the burner 1 from generating a large amount of NOx, when the temperature of the hearth 19 is higher than 800 ℃, the first cut-off valve 3 in front of the burner 1 is closed, the second cut-off valve 4 in front of the VOC waste gas cavity 5 is opened, so that high-calorific-value fuel is directly sprayed into the VOC waste gas cavity 5 and is mixed with the VOC waste gas, then sprayed into the furnace 19 to be mixed with secondary air and oxidized and cracked at high temperature to release heat.
A method of incinerating VOC exhaust gas with high efficiency and low nitrogen content, using the incinerator of any preceding claim and including the steps of:
s1: the burner 1 burns high calorific value fuel to heat a hearth 19 of the incinerator body 7; the burner 1 is adopted to burn high calorific value fuel to heat the hearth, and a double-cross amplitude limiting control mode is adopted to adjust the ratio of the high calorific value fuel to combustion air.
S2: when the temperature of the hearth 19 reaches 800 ℃, introducing VOC waste gas and secondary air, and respectively entering a VOC waste gas cavity and a secondary air cavity at the inlet end of the incinerator body 7 after the heat exchange of the VOC waste gas and the secondary air is carried out by a waste gas heat exchanger 8 and a secondary air heat exchanger 9;
s3: after heat exchange, secondary air enters a secondary cavity, and is sprayed into a hearth 19 of the incinerator body 7 through air nozzles 12 uniformly distributed on an incinerator end plate, VOC waste gas after heat exchange enters a VOC waste gas cavity 5 and is uniformly sprayed into the hearth 19 of the incinerator through a spray pipe bundle 2, and the VOC waste gas and the secondary air are quickly and uniformly mixed in the hearth 19;
s4: when the heat generated by the high-temperature cracking of the VOC waste gas is not enough to maintain the temperature of the hearth 19, the first cut-off valve 3 is closed, the second cut-off valve 4 is opened, so that high-heat-value fuel is directly sprayed into the VOC waste gas cavity 5 and mixed with the VOC waste gas, and then is sprayed into the hearth 19 to be mixed with secondary air and subjected to oxidative cracking at high temperature, and heat is released;
S5: the spraying amount of the high-heat-value fuel is adjusted according to the temperature value fed back by the temperature sensor in the hearth 19, and the secondary air amount is adjusted through the real-time oxygen content measured by the rear-end oxygen content analyzer; the oxygen content measured by the oxygen content analyzer after the heat exchanger corrects the gas/air ratio in real time, and prevents the system danger caused by fuel surplus due to the component change of high-heat value mixed fuel.
The working principle of the invention is as follows: when the cold furnace is started, the burner 1 is adopted to burn high-calorific-value fuel to heat the hearth 19, the proportion of the high-calorific-value fuel to combustion air is adjusted by adopting a double-cross amplitude limiting control mode, and meanwhile, the oxygen content measured by an oxygen content analyzer behind the heat exchanger is used for correcting the gas/air proportion in real time to heat the hearth temperature to be above 800 ℃;
when the temperature of the hearth 19 reaches 800 ℃, VOC waste gas and secondary air are introduced, the VOC waste gas and the secondary air respectively enter a VOC waste gas cavity 5 and a secondary air cavity 6 at the inlet end of the incinerator after heat exchange through a waste gas heat exchanger and an air heat exchanger, the heat exchanger is used for recycling the heat of the high-temperature waste gas, the secondary air after heat exchange enters the secondary air cavity and is uniformly sprayed into the hearth of the incinerator through secondary air nozzles uniformly distributed on an end plate of the incinerator, the VOC waste gas after heat exchange enters the VOC waste gas cavity 5 and is uniformly sprayed into the hearth 19 of the incinerator through a spraying pipe bundle 2, and the VOC waste gas and the secondary air are quickly and uniformly mixed in the hearth due to the uniform staggered arrangement of the air nozzles 12 and the spraying pipe bundle 2 in concentric circles, so that the generation of a large amount of NOx caused by local high temperature due to obvious flame in the hearth is prevented, meanwhile, the high-temperature section of the hearth is maintained at a position close to the inlet side of the incinerator, so that the VOC removing efficiency is ensured.
When the heat generated by the pyrolysis of VOC in the waste gas is not enough to maintain the temperature of the hearth, a certain amount of high-heat value fuel is supplemented into the VOC waste gas, in order to prevent the high-temperature flame combusted by the burner 1 from generating a large amount of NOx, when the temperature of the hearth 19 is higher than 800 ℃, the first cut-off valve 3 in front of the burner 1 is closed, the second cut-off valve 4 in front of the VOC waste gas cavity 5 is opened, so that the high-calorific-value fuel is directly sprayed into the VOC waste gas cavity 5 and mixed with the VOC waste gas, then is sprayed into a hearth 19 to be mixed with secondary air and is subjected to oxidative cracking at high temperature to release heat, the injection amount of the high-heating-value fuel is adjusted according to the feedback temperature of the hearth 19, and meanwhile, the secondary air amount is adjusted through the real-time oxygen content measured by the rear-end oxygen content analyzer 10, so that the sufficient oxygen content in the hearth 19 is ensured to meet the requirement of the oxidative cracking of VOC (volatile organic compounds) in the waste gas and the high-heating-value fuel in the high-temperature environment of the hearth 19.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications, equivalent arrangements, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The high-efficiency low-nitrogen VOC waste gas incinerator is characterized by comprising an incinerator body (7) and a burner (1) for burning high-calorific-value fuel, wherein an inlet of the incinerator body (7) is hermetically connected with an end plate (18), a VOC waste gas cavity (5) and a secondary air cavity (6) which are mutually separated are arranged between the end plate (18) and the burner (1), the VOC waste gas cavity (5) is communicated with one end of a plurality of injection tube bundles (2), the other end of the plurality of injection tube bundles (2) penetrates through the end plate (18) to extend into a hearth (19), the penetrating part of the injection tube bundles (2) and the end plate (18) is sealed, a waste gas inlet (15) is formed in the VOC waste gas cavity (5), the secondary air cavity (6) is communicated with the hearth (19) through a plurality of air nozzles (12) in the end plate (18), the air nozzles (12) and the injection tube bundles (2) are uniformly arranged in a staggered manner, be equipped with air inlet (16) on secondary air cavity (6), be equipped with waste gas heat exchanger (8), secondary air heat exchanger (9) at incinerator body (7) rear end and carry out the heat exchange to VOC waste gas and secondary air respectively, nozzle (1) exit end passes in VOC waste gas cavity (5), secondary air cavity (6) and end plate (18) and extend to furnace (19), during the operation, cut off the high calorific value fuel of nozzle (1), directly spout high calorific value fuel into VOC waste gas, then spout into furnace (19) through different passageways with the secondary air, form flameless combustion.
2. The efficient low-nitrogen VOC waste gas incinerator according to claim 1, characterized in that said air nozzles (12) are uniformly distributed on the end plate (18) in concentric circular shape, and said spray tube bundles (2) are uniformly distributed on the end surface of the VOC waste gas cavity (5) in concentric circular shape.
3. A high efficiency, low nitrogen VOC flue gas incinerator according to claim 1 wherein the inlet end of said flue gas heat exchanger (8) is in communication with the flue gas duct and its outlet end is in communication with the flue gas inlet of the VOC flue gas chamber (5) through a duct, said secondary air heat exchanger (9) is provided with a secondary air inlet (17), and the outlet of said secondary air heat exchanger (9) is in communication with the air inlet (16) of the secondary air chamber (6) through a duct.
4. A high efficiency low nitrogen VOC exhaust gas incinerator according to claim 3 wherein said incinerator body (7) has a temperature measuring point in the furnace (19) and a temperature sensor is provided to measure the combustion temperature in said furnace (19).
5. A high efficiency low nitrogen VOC waste gas incinerator according to claim 4 characterized in that the rear end of said incinerator body (7) is also equipped with oxygen content analyzer (10).
6. A high efficiency low nitrogen VOC exhaust gas incinerator according to claim 1 wherein said burner (1) is provided with fuel inlet (14) and combustion air inlet (13) communicating with external high calorific value fuel pipe (11) for feeding high calorific value fuel and combustion air into the furnace (19) of said incinerator body (7) according to a predetermined ratio for combustion.
7. A high-efficiency low-nitrogen VOC waste gas incinerator according to claim 6, characterized in that the end of the high calorific value fuel pipeline (11) is simultaneously communicated with the fuel inlet (14) of the burner (1) and the waste gas inlet (15) of the VOC waste gas cavity (5), a first cut-off valve (3) is arranged between the high calorific value fuel pipeline (11) and the fuel inlet (14) of the burner (1), and a second cut-off valve (4) is arranged between the high calorific value fuel pipeline (11) and the waste gas inlet (15) of the VOC waste gas cavity (5).
8. A method for incinerating VOC exhaust gas with high efficiency and low nitrogen content, characterized by using an incinerator as claimed in any one of the preceding claims and comprising the steps of:
s1: the burner (1) burns high-calorific-value fuel to heat a hearth (19) of the incinerator body (7);
s2: when the temperature of the hearth (19) reaches 800 ℃, introducing VOC waste gas and secondary air, and respectively entering a VOC waste gas cavity (5) and a secondary air cavity (6) at the inlet end of the incinerator body (7) after the VOC waste gas and the secondary air are subjected to heat exchange through a waste gas heat exchanger (8) and a secondary air heat exchanger (9);
S3: after heat exchange, secondary air enters a secondary air cavity (6), and is sprayed into a hearth (19) of the incinerator body (7) through air nozzles (12) uniformly distributed on an end plate (18), VOC waste gas after heat exchange enters a VOC waste gas cavity (5) and is uniformly sprayed into the hearth (19) of the incinerator body (7) through a spraying pipe bundle (2), and the VOC waste gas and the secondary air are quickly and uniformly mixed in the hearth (19);
s4: when the heat generated by the high-temperature cracking of the VOC waste gas is not enough to maintain the temperature of the hearth (19), the first cut-off valve (3) is closed, the second cut-off valve (4) is opened, so that high-calorific-value fuel is directly sprayed into the VOC waste gas cavity (5) and mixed with the VOC waste gas, and then is sprayed into the hearth (19) to be mixed with secondary air, and is subjected to oxidative cracking at high temperature and releases heat;
s5: the injection amount of the high-heat-value fuel is adjusted according to the temperature value fed back by the temperature sensor in the hearth (19), and the secondary air amount is adjusted through the real-time oxygen content measured by the rear-end oxygen content analyzer (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010573238.9A CN111649343B (en) | 2020-06-22 | 2020-06-22 | Efficient low-nitrogen VOC waste gas incinerator and incineration method |
Applications Claiming Priority (1)
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