CN114110618B - Combustion device for treating acrylonitrile wastewater - Google Patents
Combustion device for treating acrylonitrile wastewater Download PDFInfo
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- CN114110618B CN114110618B CN202111314593.5A CN202111314593A CN114110618B CN 114110618 B CN114110618 B CN 114110618B CN 202111314593 A CN202111314593 A CN 202111314593A CN 114110618 B CN114110618 B CN 114110618B
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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
- F23G7/008—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for liquid waste
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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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
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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
- F23G2209/10—Liquid waste
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Abstract
The invention discloses a combustion device for treating acrylonitrile wastewater, which comprises a combustor and an incinerator; the burner consists of a shell, a central oil-gas combined spray gun, a peripheral oil-gas combined spray gun, an ignition gun, a flame detector, a sight glass and a connecting flange; the incinerator comprises a reduction incineration area, an oxidation incineration area, a denitration temperature adjustment area and an SNCR denitration area; the incinerator outlet is provided with a secondary temperature regulating area, the primary incineration area and the oxidation incineration area are arranged on the vertical section of the incinerator, and the denitration temperature regulating area, the SNCR denitration area and the secondary temperature regulating area are arranged on the horizontal section of the incinerator. The combustion device for treating the acrylonitrile wastewater, which is provided by the embodiment of the application, can treat the acrylonitrile wastewater with high efficiency, ensure that the decomposition of harmful substances is complete and reduce the secondary pollution of NOx as much as possible.
Description
Technical Field
The invention belongs to the technical field of chemical waste incineration, and particularly relates to a combustion device for treating acrylonitrile wastewater.
Background
The waste liquid incineration system is an important safety and environmental protection facility for petrochemical enterprises, is used for treating waste gas and waste liquid discharged by various process devices and auxiliary facilities, can timely, safely and reliably perform harmless incineration treatment, and meets the related environmental protection requirements. The waste liquid treatment technology has the international advanced level, high heat efficiency, low energy consumption and low pollutant emission.
The incineration method has the greatest advantage of reducing the waste water rapidly and to a great extent, and is a very effective waste water treatment method. The waste water incineration process is a comprehensive process integrating multiple subjects such as physical change, chemical change, reaction dynamics, catalysis, combustion aerodynamics, heat transfer science and the like.
The waste water produced in the acrylonitrile industry is large in quantity and contains fuel N, so that a combustion device is needed to burn acrylonitrile waste water, and the NOx content in the flue gas is controlled at the minimum level by reasonably designing a combustion system, so that the emission requirement is met, the long-period stable operation of the system is realized, and the operation reliability of the system is ensured.
Disclosure of Invention
In order to solve the problems, the embodiment of the invention provides a combustion device for treating acrylonitrile wastewater, which can effectively reduce the emission of NOx.
The technical scheme of the invention is as follows: a combustion device for treating acrylonitrile wastewater comprises a combustor and an incinerator;
the burner comprises a shell, a central oil-gas combined spray gun, a peripheral oil-gas combined spray gun, an ignition gun, a flame detector, a sight glass and a connecting flange;
the incinerator comprises a reduction incineration area, an oxidation incineration area, a denitration temperature adjustment area and an SNCR denitration area; the incinerator is characterized in that a secondary temperature regulating area is arranged at the outlet of the incinerator, the primary incineration area and the oxidation incineration area are arranged on the vertical section of the incinerator, and the denitration temperature regulating area, the SNCR denitration area and the secondary temperature regulating area are arranged on the horizontal section of the incinerator.
The inner wall of the shell is provided with a ceramic fiber felt for heat preservation and heat insulation;
a partition plate is arranged at the lower part of the shell, and a space exists between the partition plate and the burner outlet and is used for constructing refractory castable;
the center of the shell is provided with a combustion throat, 6 combustion throats are uniformly arranged on the periphery of the shell, and tangential rotational flow arrangement is formed by the combustion throats.
The central oil-gas combined spray gun is characterized in that an oil gun and a gas gun are arranged at the central position of the central oil-gas combined spray gun, the oil gun and the gas gun form a jacket, the center of the jacket is fuel oil, and fuel gas is arranged outside the jacket;
the gas gun outlet is provided with a flame stabilizer, and the flame stabilizer consists of a preset number of cyclone flame stabilizing blades.
The ignition gun is fuel gas or compressed air semi-premixed, the ignition gun is arranged on the outer side of the central oil-gas combined spray gun, and an ignition end of the ignition gun is arranged beside the flame stabilizer and used for igniting main flames.
The number of the flame detectors is 3, and 1 flame detector is arranged on the side face of the burner shell, and the end part of the flame detector is aligned to the tail end of the ignition gun and is used for monitoring the flame of the ignition gun;
and 2 are arranged at the top of the burner and are used for monitoring the burning of big flames.
The number of the sight glass is 7, and the sight glass is distributed on the center and the peripheral oil gas combined spray gun end plate and is used for observing the working state of each spray gun;
the connecting flange is used for connecting the burner and the incinerator.
The reduction incineration zone consists of a reduction incineration first zone and a reduction incineration second zone;
acrylonitrile waste water spray guns are uniformly arranged on the initial end shoulder part of the first reduction incineration area and the initial end shoulder part of the second reduction incineration area;
the first reduction incineration area and the second reduction incineration area are respectively provided with an air inlet for providing oxygen required by wastewater incineration;
the gun head of each acrylonitrile wastewater spray gun is positioned in an air outlet pipeline;
a lining structure is arranged on the inner side of the reduction incineration zone furnace shell, a chrome corundum brick is arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer;
and a laser CO analyzer and a thermocouple measuring point are arranged at the outlet of the reduction incineration zone and are used for monitoring the CO content and the temperature of the reduction zone.
An air inlet is formed in the starting position of the oxidation incineration area and used for providing air required by oxidation incineration;
the inlet of the oxidation incineration area is provided with a reducing diameter for increasing the flow rate of the flue gas and increasing the disturbance of the flue gas and oxidation wind, and each wind pipe of the oxidation wind forms a first preset angle with the flow direction of the flue gas;
a lining structure is arranged on the inner side of the oxidation incineration zone furnace shell, mullite bricks are arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer;
the outlet of the oxidation incineration area is provided with laser O 2 Analyzer, thermocouple measuring point and pressure measuring point, the laser O 2 The analyzer is used for monitoring O 2 The content, thermocouple measurement point is used for monitoring oxidation zone temperature, the pressure measurement point is used for monitoring furnace pressure.
An air inlet is formed in the initial position of the denitration temperature regulating area;
the front exhaust outlet direction is perpendicular to the flue gas flowing direction; the rear air outlet is arranged at the shoulder part of the temperature regulating area, and the direction of the air outlet is arranged at an angle with the flow direction of the flue gas;
and a thermocouple measuring point is arranged at the outlet of the denitration temperature-regulating area.
An SNCR spray gun is arranged at the inlet of the SNCR denitration zone;
lining structures are arranged on the inner sides of the denitration temperature regulation area and the SNCR denitration area furnace shell, mullite bricks are arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer;
the secondary temperature adjusting area is provided with an air inlet, and the direction of the secondary temperature adjusting air outlet and the flow direction of the smoke are tangential rotational flow.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a combustion device for treating acrylonitrile wastewater, which comprises a combustor and an incinerator, wherein the combustor provides a high-temperature heat source for the treatment of the acrylonitrile wastewater, and the incinerator provides sufficient incineration space and incineration time for the acrylonitrile wastewater. The combustion device for treating the acrylonitrile wastewater adopts an advanced multi-stage combustion process technology, adopts a mature, advanced and reasonable incineration technology, can treat the acrylonitrile wastewater with high efficiency, ensures complete decomposition of harmful substances, reduces the secondary pollution of NOx as much as possible, reduces the running cost of the system and the overall investment, and achieves the effects of maximum energy conservation, energy conservation and pollution reduction.
Drawings
FIG. 1 is a schematic view of a burner according to an embodiment of the present invention;
FIG. 2 is a schematic view of an incinerator according to an embodiment of the present invention;
FIG. 3 is a layout of an SNCR lance in accordance with an embodiment of the present invention;
fig. 4 is a layout diagram of a secondary temperature-adjusting air duct according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, according to specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The combustion device for treating acrylonitrile wastewater mainly comprises a burner and an incinerator. The burner has the function of providing a high-temperature heat source for the treatment of the acrylonitrile wastewater, and adopts the technical scheme that the burner is a high-power combined burner in the type of oil burning, gas burning or oil-gas mixed burning; the incinerator can adopt an L-shaped furnace body for top burning, and has the function of providing sufficient incineration space and incineration time for acrylonitrile wastewater, and the adopted technical scheme is multi-stage air distribution, multi-stage wastewater arrangement, in-furnace reduction-before-oxidation technology and in-furnace ammonia spraying denitration technology, so that the emission of NOx can be effectively reduced.
The following describes a combustion apparatus for treating acrylonitrile wastewater and its operation principle according to an embodiment of the present application with reference to fig. 1 to 4.
The combustion device for treating acrylonitrile wastewater in the embodiment of the application comprises a combustor and an incinerator, and the specific structure of the combustor is described below with reference to fig. 1, and the specific structure of the incinerator is described with reference to fig. 2.
1. Burner with a burner body
The burner for treating acrylonitrile wastewater mainly comprises a shell 101, a central oil-gas combined spray gun 102, a peripheral oil-gas combined spray gun 103, an ignition gun 104, a flame detector 105, a sight glass 106 and a connecting flange 107. The burner can provide 0-25 MW of power, and natural gas or diesel oil can be used alone or in combination as fuel.
The inner wall of the housing 101 is provided with a ceramic fiber mat 108 for thermal insulation and heat preservation. A partition 109 made of 310S is provided at the lower part of the casing 101, and a space is provided between the partition and the burner outlet for the construction of the refractory castable 110. The center of the shell is provided with 1 center combustion throat 111, the periphery of the shell is evenly provided with 6 peripheral combustion throats 112, and the center combustion throat 111 and the peripheral combustion throats 112 form tangential rotational flow arrangement.
The central oil-gas combined spray gun 102 is provided with a central oil gun 113 and a gas gun 114 at the central position, the central oil gun 113 and the gas gun 114 form a jacket, the center of the jacket is fuel oil, and the outside of the jacket is fuel gas. The flame holder 115 is arranged at the outlet of the gas gun 114 and is used for stabilizing flame, and the flame holder 115 consists of 8-12 swirl flame stabilizing blades.
The peripheral oil-gas combined spray gun 103 is provided with a peripheral oil gun 116 and four annular gas spray guns 117 at the center, the center is fuel oil, and the fuel gas is at the outermost side.
The ignition gun 104 is a fuel gas/compressed air semi-premixed type, is arranged outside the central oil-gas combined type spray gun 102, and the ignition end of the ignition gun 104 is arranged on the side of the flame stabilizer 115, so that main flames can be smoothly ignited.
The total of 3 flame detectors 105, 1 are arranged on the side face of the burner housing 101, and the end parts of the flame detectors are aligned with the tail ends of the ignition guns for monitoring the flames of the ignition guns 104; 2 are arranged on top of the burner housing 101 for monitoring the burning of a large flame.
The number of the sight glass 106 is 7, and the sight glass 106 is arranged on the end plates of the central oil gas combined type spray gun 102 and the peripheral oil gas combined type spray gun 103, so that the working states of the spray guns can be observed respectively.
The connection flange 107 is used for the connection of the burner to the incinerator.
2. Incinerator with a heat exchanger
As shown in fig. 2, the operating area of the incinerator for treating acrylonitrile wastewater mainly comprises a reduction incineration area 201, an oxidation incineration area 202, a denitration temperature-regulating area 203 and an SNCR denitration area 204, and a secondary temperature-regulating area 205 is further arranged at the outlet of the incinerator. The reduction incineration zone 201 and the oxidation incineration zone 202 are arranged on the vertical section of the incinerator, and the denitration temperature-regulating zone 203, the SNCR denitration zone 204 and the secondary temperature-regulating zone 205 are arranged on the horizontal section of the incinerator. And (5) designing micro negative pressure in the incinerator.
The reduction incineration zone 201 is composed of a reduction incineration 1 zone 206 and a reduction incineration 2 zone 207. The acrylonitrile waste water spray guns 208 are uniformly arranged on the starting end shoulder of the reduction incineration 1 area 206 and the starting end shoulder of the reduction incineration 2 area 207. The reduction incineration 1 area 206 and the reduction incineration 2 area 207 are respectively provided with an air inlet for providing oxygen required by wastewater incineration. The gun heads of the acrylonitrile waste water spray guns 208 are all positioned in the air outlet pipeline, so that the waste water can be ensured to fully react with oxygen, and an air flow cooling protection can be formed for the spray heads.
The acrylonitrile waste water spray gun 208 can be used according to different working conditions, and the incinerator has a large waste water regulating capacity. A lining structure is arranged on the inner side of the furnace shell of the reduction incineration zone 201, a chrome corundum brick 209 is arranged on the fire surface, and a ceramic fiber plate is arranged on the heat insulation layer. The outlet of the reduction incineration zone 201 is provided with a laser CO analyzer 211 and a thermocouple 212 measuring point for monitoring the CO content and the temperature of the reduction incineration zone 201.
An air inlet is arranged at the beginning of the oxidation incineration area 202, and the air inlet is formed by a plurality of oxidation air pipes 213 and is used for providing air required by oxidation incineration. The inlet of the oxidation incineration area 202 is provided with a diameter reduction, so that the flow rate of the flue gas is increased, and the disturbance of the flue gas and oxidation wind is enhanced, so that the purpose of full oxidation is realized. Each air pipe of the oxidation air is arranged at a certain angle with the flow direction of the flue gas.
The inner side of the furnace shell of the oxidation incineration area 202 is provided with a lining structure, the mullite brick 210 is arranged on the fire surface, and the heat insulation layer is provided with a ceramic fiber board. The laser O is arranged at the outlet of the oxidation incineration area 202 2 Analyzer 214, thermocouple point 212 and pressure point 215 for monitoring O 2 Content, oxidation incineration zone 202 temperature, and oxidation incineration zone 202 pressure. An air inlet is formed at the beginning of the denitration temperature-regulating area 203, and the air inlet is composed of a plurality of temperature-regulating air pipes 216 for temperature regulation. The direction of the temperature-regulating wind front exhaust outlet is perpendicular to the flow direction of the flue gas; the rear row is arranged at the shoulder of the denitration temperature regulating area 203, and the wind outlet direction and the flue gas flowing direction are arranged at an angle.
The thermocouple measuring point 212 at the outlet of the denitration temperature regulating area 203 is used for monitoring the temperature regulating effect. The inner sides of the furnace shells of the denitration temperature-regulating area 203 and the SNCR denitration area 204 are provided with lining structures, mullite bricks 210 are arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer. An air inlet is arranged on the secondary temperature adjusting area 205 and is used for secondary temperature adjustment.
As shown in fig. 2 and 3, the SNCR lance 217 is disposed at the inlet of the SNCR denitration zone 204. The upper 2 SNCR guns 217 of row 1 are arranged at 120 ° and the lower 2 SNCR guns 217 are arranged at 70 °. The 2 nd row has the upper 2 SNCR guns 217 arranged at 90 °, the middle 2 SNCR guns 217 arranged at 150 °, and the lower 2 SNCR guns 217 arranged at 60 °.
As shown in fig. 2 and fig. 4, 2 exhaust nozzles are arranged on the secondary temperature-regulating air, 12 DN125 air pipes 218 outlets are uniformly distributed on the front row, the air outlets are arranged in tangential rotational flow with the flow direction of the flue gas, and the tangential diameter is 2000mm; the back row is uniformly provided with 12 DN125 air pipes 218 outlets, the direction of the air outlets and the flow direction of the flue gas are tangential rotational flow, and the tangential diameter is 1000mm.
The burner is connected with the incinerator through a connecting flange to form a device for treating acrylonitrile wastewater. The above description of the specific structure of the apparatus will now explain the flow and principles of the apparatus for performing a low NOx combustion method.
3. Description of low NOx combustion method:
1) Reasonable graded air distribution
As shown in fig. 2, the combustion device for treating the acrylonitrile wastewater is totally provided with 6-level air distribution, wherein the combustion air is in 4 paths, which respectively distributes air to the burner, the reduction incineration 1 area 206, the reduction incineration 2 area 207 and the oxidation incineration area 202; the air is regulated into 2 paths, which are respectively distributed to the denitration temperature regulating area 203 and the secondary temperature regulating area 204.
The air distribution of the burner, the air distribution of the reduction incineration 1 area and the air distribution of the incineration 2 area are designed to have an oxygen deficiency coefficient of 0.8, and the adjustable range of the oxygen deficiency coefficient is 0.6-1.
The air distribution design peroxy coefficient of the oxidation incineration area is 1.4, and the adjustable range of the oxygen coefficient is 0.8-1.6. The design air quantity of the air distribution of the denitration temperature-regulating area can meet the design temperature-regulating target of 950 ℃. The design air quantity of the air distribution of the secondary temperature regulating area can meet the design temperature regulating target of 650 ℃.
2) Reasonable residence time of flue gas
The residence time of the flue gas in the reduction incineration area 201 is 0.8 to 1.2s; the residence time of the flue gas in the oxidation incineration area 202 is 0.85 to 1.35s; the residence time of the flue gas in the denitration temperature-regulating area 203 is 0.7 to 1s; the residence time of the flue gas in the SNCR denitration zone 204 is 0.7 to 1s.
The total effective volume of the furnace chamber of the incinerator for treating the acrylonitrile wastewater can meet the requirement that the total residence time of high-temperature flue gas in the incinerator is more than 2s, and can fully meet the incineration residence time and residence space of the acrylonitrile wastewater.
3) Reduction oxidation combustion technology
Below the burner a reduction incineration zone 201 of the incineration device is introduced. The acrylonitrile plant wastewater is combined prior to entering the plant and then introduced into the high temperature zone of the reduction incineration zone 201 through the high and low floor acrylonitrile wastewater lance 208, with the amount of combustion oxygen injected with the wastewater maintained below the stoichiometric air/wastewater ratio. In an oxygen-deficient environment, each compound such as acrylonitrile (C 3 H 3 N), acetonitrile (C) 2 H 3 N), hydrocyanic acid (HCN), and propionitrile (C) 3 H 5 N) nitrogen is reduced to N 2 Rather than NOx formation, the operating temperature drop of the reduction stage is adjusted by controlling the stoichiometric ratio. By such design, the formation of NOx from chemical nitrogen in the waste stream is greatly inhibited.
The operating temperature of the reduction incineration zone 201 is between 900 ℃ and 1150 ℃.
Excess oxidizing air is introduced at the inlet of the oxidation incineration zone 202 to complete the oxidation. Oxidation air is sprayed into the flue gas from the reduction incineration zone 201 through the annular spray holes, so that the sufficient mixing can be achieved.
The operating temperature in the oxidation incineration zone 202 is 1050-1100 ℃.
In order to further oxidize the combustible materials remaining in the flue gas at the outlet of the incineration zone 201, the incineration zone 202 must be controlled at a higher operating temperature. But this operating temperature cannot be too high otherwise thermal NOx is generated, which is mainly dependent on high temperatures and secondly requires sufficient oxygen. Therefore, the control of temperature and peroxide must be such that adequate combustion is achieved to achieve high destruction rates while preventing thermal NOx formation.
4) Good in-furnace denitration level
The SNCR denitration zone 204 is used to further remove NOx from the flue gas. The combustion products in the oxidation incineration area 202 enter a NOx selective non-catalytic reduction System (SNCR), after the temperature of the temperature regulating air in the denitration temperature regulating area 203 is regulated, ammonia water is atomized by compressed air by utilizing an SNCR spray gun 217 and then sprayed into a hearth, the design of the spray gun ensures that NOx and ammonia are finely mixed, and ammonia reacts with NOx to reduce N2. With this technique, approximately 40% to 50% of the NOx is reduced.
10 SNCR spray guns 217 are arranged on the SNCR denitration zone 204 in a front 4 and rear 6 mode. The SNCR spray gun 217 adopts a fan-shaped atomized ammonia water spraying technology, and has good atomization effect.
The combustion device for treating acrylonitrile wastewater, which is provided by the embodiment of the application, can effectively treat various kinds of nitrile-containing wastewater generated by the acrylonitrile device, adopts an advanced multi-stage combustion process technology, adopts a mature, advanced and reasonable incineration technology, can treat the acrylonitrile wastewater with high efficiency, ensures that the decomposition of harmful substances is complete and the secondary pollution of NOx is reduced as much as possible, reduces the running cost of a system and the overall investment, and achieves the effects of maximum energy conservation, energy conservation and pollution reduction.
The foregoing is merely illustrative of the best embodiments of the present invention, and the present invention is not limited thereto, but any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be construed as falling within the scope of the present invention.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (5)
1. A combustion apparatus for treating acrylonitrile wastewater, the apparatus comprising: a burner and an incinerator;
the burner comprises a shell, a central oil-gas combined spray gun, a peripheral oil-gas combined spray gun, an ignition gun, a flame detector, a sight glass and a connecting flange; the center of the shell is provided with 1 center combustion throat, the periphery of the shell is uniformly provided with 6 peripheral combustion throats, and the center combustion throat and the peripheral combustion throats form tangential rotational flow arrangement; the central oil-gas combined spray gun is provided with a central oil gun and a gas gun at the central position, the central oil gun and the gas gun form a jacket, the center of the jacket is fuel oil, and the outside of the jacket is fuel gas; the central position of the peripheral oil-gas combined spray gun is provided with a peripheral oil gun and four annular gas spray guns, the center is fuel oil, and the fuel gas is at the outermost side;
the incinerator consists of a reduction incineration area, an oxidation incineration area, a denitration temperature adjustment area and an SNCR denitration area; the incinerator outlet is provided with a secondary temperature regulating zone, the reduction incineration zone and the oxidation incineration zone are arranged on the vertical section of the incinerator, and the denitration temperature regulating zone, the SNCR denitration zone and the secondary temperature regulating zone are arranged on the horizontal section of the incinerator; an air inlet is formed in the initial position of the denitration temperature-adjusting area, and the air inlet consists of a plurality of temperature-adjusting air pipes and is used for adjusting temperature; the direction of the temperature-regulating wind front exhaust outlet is perpendicular to the flow direction of the flue gas; the rear air outlet is arranged at the shoulder part of the denitration temperature regulating area, and the direction of the air outlet is arranged at an angle with the flow direction of the flue gas; a thermocouple measuring point is arranged at the outlet of the denitration temperature-regulating area;
the reduction incineration zone consists of a reduction incineration first zone and a reduction incineration second zone; acrylonitrile waste water spray guns are uniformly arranged on the initial end shoulder part of the first reduction incineration area and the initial end shoulder part of the second reduction incineration area; the first reduction incineration area and the second reduction incineration area are respectively provided with an air inlet for providing oxygen required by wastewater incineration; the gun head of each acrylonitrile wastewater spray gun is positioned in an air outlet pipeline; a lining structure is arranged on the inner side of the reduction incineration zone furnace shell, a chrome corundum brick is arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer; a laser CO analyzer and a thermocouple measuring point are arranged at the outlet of the reduction incineration zone and used for monitoring the CO content and the temperature of the reduction zone;
the SNCR spray guns are arranged at the inlet of the SNCR denitration zone, the upper 2 SNCR spray guns of the 1 st row are arranged at 120 degrees, and the lower 2 SNCR spray guns are arranged at 70 degrees; the 2 nd row of 2 SNCR spray guns are arranged at 90 degrees, the 2 SNCR spray guns at the middle are arranged at 150 degrees, and the 2 SNCR spray guns at the lower are arranged at 60 degrees;
the air distribution of the burner, the air distribution of the first reduction and incineration area and the air distribution of the second reduction and incineration area are designed to have an oxygen deficiency coefficient of 0.8; the air distribution design peroxy coefficient of the oxidation incineration area is 1.4; the design air quantity of air distribution of the denitration temperature regulating area meets the design temperature regulating target 950 ℃, and the design air quantity of air distribution of the secondary temperature regulating area meets the design temperature regulating target 650 ℃;
an air inlet is formed in the starting position of the oxidation incineration area and used for providing air required by oxidation incineration;
the inlet of the oxidation incineration area is provided with a reducing diameter for increasing the flow rate of the flue gas and increasing the disturbance of the flue gas and oxidation wind, and each wind pipe of the oxidation wind forms a first preset angle with the flow direction of the flue gas;
a lining structure is arranged on the inner side of the oxidation incineration zone furnace shell, mullite bricks are arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer;
the outlet of the oxidation incineration area is provided with laser O 2 Analyzer, thermocouple measuring point and pressure measuring point, the laser O 2 The analyzer is used for monitoring O 2 The thermocouple measuring point is used for monitoring the temperature of the oxidation zone, and the pressure measuring point is used for monitoring the pressure of the hearth;
an SNCR spray gun is arranged at the inlet of the SNCR denitration zone;
lining structures are arranged on the inner sides of the denitration temperature regulation area and the SNCR denitration area furnace shell, mullite bricks are arranged on the fire surface, and a ceramic fiber board is arranged on the heat insulation layer;
the secondary temperature adjusting area is provided with an air inlet, and the direction of the secondary temperature adjusting air outlet and the flow direction of the smoke are tangential rotational flow.
2. The combustion apparatus for treating acrylonitrile wastewater according to claim 1, wherein:
the gas gun outlet of the central oil-gas combined spray gun is provided with a flame stabilizer, and the flame stabilizer consists of a preset number of cyclone flame stabilizing blades.
3. The combustion apparatus for treating acrylonitrile wastewater according to claim 2, wherein:
the ignition gun is a fuel gas or compressed air semi-premixed type, the ignition gun is arranged on the outer side of the central oil-gas combined type spray gun, and an ignition end of the ignition gun is arranged beside the flame stabilizer and used for igniting main flames.
4. A combustion apparatus for treating acrylonitrile wastewater as set forth in claim 3, wherein,
the number of the flame detectors is 3, and 1 flame detector is arranged on the side face of the burner shell, and the end part of the flame detector is aligned to the tail end of the ignition gun and is used for monitoring the flame of the ignition gun;
and 2 are arranged at the top of the burner and are used for monitoring the burning of big flames.
5. The combustion apparatus for treating acrylonitrile wastewater according to claim 1, wherein:
the number of the sight glass is 7, and the sight glass is distributed on the center and the peripheral oil gas combined spray gun end plate and is used for observing the working state of each spray gun;
the connecting flange is used for connecting the burner and the incinerator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111314593.5A CN114110618B (en) | 2021-11-08 | 2021-11-08 | Combustion device for treating acrylonitrile wastewater |
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| CN202111314593.5A CN114110618B (en) | 2021-11-08 | 2021-11-08 | Combustion device for treating acrylonitrile wastewater |
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| CN114110618A CN114110618A (en) | 2022-03-01 |
| CN114110618B true CN114110618B (en) | 2024-04-09 |
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