CN107270288B - Common-mode synchronous industrial flue gas after-combustion circulating treatment module, device and method - Google Patents

Common-mode synchronous industrial flue gas after-combustion circulating treatment module, device and method Download PDF

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CN107270288B
CN107270288B CN201710668790.4A CN201710668790A CN107270288B CN 107270288 B CN107270288 B CN 107270288B CN 201710668790 A CN201710668790 A CN 201710668790A CN 107270288 B CN107270288 B CN 107270288B
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flue gas
porous medium
combustion
conical
gas
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CN107270288A (en
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段秀春
许嘉文
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Shen Shaowu
Xu Huaxiong
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)

Abstract

A common-mode synchronous industrial flue gas after-combustion circulating treatment module, a device and a method are disclosed, the module comprises a cylindrical burner and two conical cylindrical porous medium cores, the cylindrical burner comprises a cylinder body and an annular radiation screen sleeved in the cylinder body, a gas mixing chamber is formed between the cylinder body and the radiation screen, a radial gas inlet scroll is arranged at the outer side part of the cylinder body, and a central shaft is arranged at the center of the cylindrical burner; the two conical cylindrical porous medium cores are sleeved on the central shaft of the cylindrical combustor in a symmetrical manner with the conical tops opposite to each other and can axially slide, a secondary combustion space is formed between the two conical cylindrical porous medium cores and the annular radiation screen, and the two conical bottoms respectively form an air inlet and an air outlet. The device is composed of a plurality of modules. The method comprises low-nitrogen combustion, wherein the returned flue gas and oxygen-containing flue gas generated by the low-nitrogen combustion are discharged after being combusted in a secondary combustion space. The invention can save energy while realizing low NOX and VOC emission.

Description

Common-mode synchronous industrial flue gas re-combustion circulating treatment module, device and method
Technical Field
The present invention relates to an industrial flue gas treatment device, and particularly to a low-nitrogen and Volatile Organic Compound (VOC) treatment device and method for a gas fuel combustion system.
Background
The combustion modes adopted in the existing natural gas burners and combustors are mostly equal pressure type-diffusion, semi-premixing and premixing type combustion. Due to the improvement of the environmental emission standard, the combustion system is required to greatly reduce the emission of high-temperature Nitrogen Oxides (NOX) and process VOC, so that the full-premix type wire mesh combustor with the low NOX working characteristic is gradually popularized. But also has the characteristics of low specific power, low efficiency, low regulation ratio, easy tempering of 8230823060, 8230microwave, and the like.
The currently popular low-nitrogen burner (low-NOX burner) is a "metal fiber mesh burner". In order to obtain a stable low nitrogen emission index, the gas equivalence ratio needs to be amplified and accurately adjusted based on the low NOX generation temperature set in the wire mesh reaction zone, so as to control the flame temperature and the flame stability per unit medium area. The set low-nitrogen flame temperature is generally 850-950 ℃. Above this temperature, the amount of nitrogen oxides formed during combustion begins to increase linearly. In order to obtain larger power, the area of the wire mesh must be enlarged, so that the specific power is reduced, the radiation capability of the flame is reduced, and the overall heating capability of the system is reduced.
The low NOX emissions from porous media combustion are due to their structural properties that allow stable (flame holding) control of premixed gas with large excess air factor. Therefore, under the same heating working condition, the porous medium combustion mode can generate more oxygen-containing smoke, or needs larger combustion space, and the equipment volume is increased; otherwise, the power is reduced.
The VOC is generally defined as: the general name of volatile organic compounds which have melting point lower than room temperature and boiling point between 50 ℃ and 260 ℃ and can participate in atmospheric photochemical reaction. There are two main approaches to VOC treatment with the current state of the art. Absorption catalysis and combustion removal. For large-scale industrial production, the absorption catalysis method requires a large equipment structure and high post-treatment cost, and has a large pressure on production cost. Therefore, the combustion removal method is applied to practical VOC treatment engineering more frequently. The drawbacks of the combustion removal method are mainly the additional energy consumption, and how to reduce the system energy consumption (or how to fully utilize the additional energy consumption) is the key of the VOC combustion removal method.
Disclosure of Invention
The invention aims to provide a common-mode synchronous industrial flue gas after-combustion circulating treatment module, a common-mode synchronous industrial flue gas after-combustion circulating treatment device and a common-mode synchronous industrial flue gas after-combustion circulating treatment method, which can realize low NOX and low VOC emission and can save energy.
The invention has the conception that: the flue gas VOC combustion processor and the combustor main combustion chamber are designed in a common mode to form a common-mode synchronous industrial flue gas VOC reburning circulating processor. That is, low-NOX combustion + flue gas multi-cycle afterburning = low NOX, VOC emissions. The multi-circulation re-combustion of the flue gas forms an independent heat radiation enhanced VOC reaction area, namely a secondary combustion space, by enhancing the heat radiation of the flame of the main burner and innovating a porous medium type radiation absorber structure. The returned flue gas enters a secondary combustion space from the first porous medium, and is subjected to deceleration and diffusion; spraying out from the second porous medium, and reducing and increasing the pressure; the time slot for this process is the VOC reaction period. The gap between the two porous media is adjusted to be the control point of the reaction temperature/time of the flue gas VOC. The sensible heat of the flue gas and the combustible components are completely reacted to form 'super enthalpy' to participate in working condition heating, and extremely low NOX and VOC emission is achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a common-mode synchronous industrial flue gas reburning circulating treatment module comprises a cylindrical combustor 1 and two conical cylindrical porous medium cores 2 and 5, wherein the cylindrical combustor 1 comprises a cylinder 11 and an annular radiation screen 12 sleeved in the cylinder 11, a gas mixing chamber 13 is formed between the cylinder 11 and the radiation screen 12, a radial gas inlet scroll 6 communicated with the gas mixing chamber 13 is arranged at the outer side part of the cylinder 11, and a central shaft 4 is arranged at the center of the cylindrical combustor 1; the two conical cylindrical porous medium cores 2 and 5 are sleeved on the central shaft 4 of the cylindrical combustor 1 in a symmetrical mode with opposite conical tops and can axially slide, a secondary combustion space 3 is formed between the two conical cylindrical porous medium cores 2 and 5 and the annular radiation screen 12, and an air inlet 7 and an air outlet 8 are formed at the bottoms of the two cones respectively.
Preferably, the annular radiation screen sequentially comprises a mixed gas rectifying cavity, a capillary nozzle layer, a cross blunting body layer and a porous medium radiation layer from the outer layer to the inner layer.
Preferably, the conical cylindrical porous medium cores 2 and 5 are made of a circular planar porous medium which is convexly elongated along the axis, wherein the axis of the capillary hole is parallel to the central axis 4 of the cylindrical burner 1.
The utility model provides a synchronous type industry flue gas of common mode is fired circulation processing apparatus again, processing apparatus includes that a plurality of synchronous type industry flue gas of common mode is fired circulation processing module again and is fired circulation processing module series connection, parallelly connected or series-parallel connection constitute, a plurality of synchronous type industry flue gas of common mode is fired circulation processing module again for the synchronous type industry flue gas of common mode again, the synchronous type industry flue gas of a plurality of common mode is fired circulation processing module again for above-mentioned arbitrary one.
A common-mode synchronous industrial flue gas re-combustion circulating treatment method comprises the following steps:
configuring any one of the common-mode synchronous industrial flue gas re-combustion circulating treatment modules;
inputting fuel gas into the fuel gas mixing chamber 13 from the radial gas inlet scroll 6, wherein the fuel gas is combusted at the inner wall surface of the annular radiation screen 12 in a low-nitrogen mode, the generated oxygen-containing flue gas is discharged into the secondary combustion space 3 through the annular radiation screen 12, and the annular radiation screen 12 radiates heat to the secondary combustion space 3;
meanwhile, the other path of return flue gas enters the secondary combustion space 3 from the air inlet 7 through one conical cylindrical porous medium core body 2 and is ejected from the air outlet 8 through the other conical cylindrical porous medium core body 5;
the gap between the two conical cylindrical porous medium cores 2 and 5 is adjusted to control the reaction temperature and time of the flue gas in the secondary combustion space 3, so that combustible components in the flue gas can be completely reacted.
Preferably, the mode of controlling the afterburning of the flue gas in the secondary combustion space 3 comprises at least one of the following modes:
oxygen-containing flue gas generated by low-nitrogen combustion is discharged into the secondary combustion space 3 along the direction vertical to the central shaft 4, and the pressure of the flue gas is higher than that of the flue gas input from the conical cylindrical porous medium core 2, so that the two paths of flue gas form tangential flow turbulent mixing heat transfer;
the two cone-shaped porous medium cores 2 and 5 absorb the radiant heat of the annular radiation screen 12 to heat the medium holes of the annular radiation screen, and the flue gas obtains heat to react when flowing through the high-temperature medium holes;
the gap between the two conical cylindrical porous medium cores 2 and 5 is adjusted to enable the pneumatic parameters of the secondary combustion space 3 to change linearly, and the radiation energy of the flame is transmitted to the treated flue gas to the maximum extent.
Compared with the prior art, the invention has the following beneficial effects:
through the innovative design of the gas type low-NOx combustor and the porous medium VOC reburning processor, a combustion/reburning common-type combustion chamber is constructed, so that the combustion is changed from vector single circulation to scalar multiple circulation, the contribution rate of sensible heat of flue gas to system heat is improved, and the energy-saving effect is obvious and exact. The invention integrates multiple machine functions into a whole due to the compact structure. So that the method has the advantages of high efficiency, material saving, environmental protection and production space saving.
Drawings
FIG. 1 is a schematic structural diagram of a common-mode synchronous industrial flue gas post-combustion cycle processing module according to an embodiment;
FIG. 2 is a plan view thereof;
FIG. 3 is a schematic structural diagram of another embodiment of a common-mode synchronous industrial flue gas post-combustion circulation treatment device, which is partially cut away;
FIG. 4 is a schematic perspective view of a conical-cylindrical porous media core according to another embodiment;
FIG. 5 is a schematic plan view of a conical cylindrical porous medium core according to another embodiment;
FIG. 6 is a side view, partially broken away, of another embodiment of a conical cylindrical porous media core.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1 and 2, the common mode synchronous industrial flue gas reburning circulation processing module comprises a cylindrical combustor 1 and two conical cylindrical porous medium cores 2 and 5, wherein the cylindrical combustor 1 comprises a cylinder 11 and an annular radiation screen 12 sleeved in the cylinder 11, a gas mixing chamber 13 is formed between the cylinder 11 and the radiation screen 12, a radial gas inlet scroll 6 communicated with the gas mixing chamber 13 is arranged at the outer side part of the cylinder 11, and a central shaft 4 is arranged at the center of the cylindrical combustor 1; the two conical cylindrical porous medium cores 2 and 5 are sleeved on the central shaft 4 of the cylindrical combustor 1 in a symmetrical mode with opposite conical tops and can axially slide, a secondary combustion space 3 is formed between the two conical cylindrical porous medium cores 2 and 5 and the annular radiation screen 12, and an air inlet 7 and an air outlet 8 are formed at the bottoms of the two cones respectively.
Further, the annular radiation screen 12 adopts the following structure: from the outer layer to the inner layer, the annular radiation screen 12 sequentially comprises a mixed gas rectification cavity, a capillary nozzle layer, a cross-shaped passivation layer and a porous medium radiation layer. The mixed gas rectification cavity is used for constant pressure and constant flow, the capillary nozzle layer is used for preventing backfire, the cross bluff body layer is used as a flame setter, and the porous medium radiation layer is used for flame spreading. Through the structure, the flame is burnt under the working condition of 900 ℃ and is positioned between the cross blunt body layer and the porous medium black body layer, the porous medium made of the black body material reaches the set temperature along with the burning process, and the flame also plays a role of a constant ignition source when the heat radiation is generated outwards. Therefore, a working environment with the temperature of 900-1000 ℃ and the oxygen content of about 11% is formed in the secondary combustion space 3, so that combustible components (containing VOC) in the repeatedly returned smoke with the oxygen content of not less than 5% entering the upstream of the secondary combustion space 3 are re-combusted and burnt out, and then the smoke is discharged from the downstream of the secondary combustion space 3.
Further, the conical cylindrical porous medium cores 2 and 5 are made of a circular planar porous medium which is convexly elongated along the axis, wherein the axis of the capillary hole is parallel to the central axis 4 of the cylindrical burner 1. In specific application, the thickness (capillary depth) of the porous medium can be designed according to parameters such as flue gas components, process flow, air flow pressure drop, VOC removal rate and the like. The porous medium core bodies 2 and 5 are made into cone-shaped cylinders, the purpose is mainly to expand the wall surfaces of the pores of the capillary pore group and directly absorb the radiant heat from the radial annular radiation screen 12, and after the capillary absorbs the radiant heat, the heat is directly transferred to the smoke flowing through, namely, the smoke obtains heat to react when flowing through the high-temperature medium pores. The flat plate type porous medium has extremely small absorption corresponding to radial radiation heat, and the heat transfer of the flat plate type porous medium is mainly convection heat transfer and heat transfer of extremely small area at the periphery of the end face of the medium plate. In terms of heat transfer principle, the radiant heat transfer of a flame accounts for over 70% of its total energy.
From the aspect of heat receiving performance: compared with a porous medium conical tube with the diameter of 100 mm and the thickness of 10 mm, the multi-cavity medium plate has the bottom diameter of 100 mm, the top diameter of 30 mm, the height of 80 mm and the thickness of 10 mm, and the radial projection area of heat radiation corresponding to the wall surface with the diameter of 100 mm and the length of 80 mm of the combustion chamber is as follows: 3140mm 2 ∶17977mm 2 The area of the side of the cone is 5.72 times of that of the right circular flat plate, and the heating capacity of the cone-shaped porous medium is 5.72 times higher than that of the right circular plate;
from the aspect of heat transfer capacity: the water conservancy area of the capillary hole of the perfect circular multi-hollow dielectric plate is 7389mm 2 The water conservancy area of the conical cylindrical porous medium is 21733mm 2 The heat dissipation area of the conical cylinder is 2.94 times of that of the regular round flat plate.
From the comparison of the simple data, one core of the invention is the common-mode synchronous flue gas VOC treatment structure which is extremely high overall thermal efficiency in a low-nitrogen combustion state.
The porous medium material can be: 310S, siC, 25Lv5, 27Lv7m2.
Referring to fig. 3, the common mode synchronous industrial flue gas after-combustion circulation processing device is formed by connecting two common mode synchronous industrial flue gas after-combustion circulation processing modules in series. The common-mode synchronous industrial flue gas after-combustion circulating treatment module is basically the same as the treatment module shown in figure 1, and is different from the treatment module shown in figure 1 in that capillary pores of the conical cylindrical porous medium cores 2 and 5 are different. The foregoing embodiments are circular holes. In the present embodiment, the triangular holes are shown, and with reference to fig. 4 to 6, arrows A1 and A2 indicate the airflow direction.
In practical application, a plurality of common mode synchronous industrial flue gas re-combustion circulating treatment modules can be connected in series, in parallel or in series and parallel to form the common mode synchronous industrial flue gas re-combustion circulating treatment device according to requirements.
The common-mode synchronous industrial flue gas after-combustion circulating processing module is suitable for low-nitrogen and VOC processing of all gas fuel combustion systems.
The flue gas treatment process mainly comprises the following steps: the smoke/air is mixed to form gas, the gas is combusted to transfer heat, the smoke porous medium is subjected to secondary combustion, and the mixed smoke is output. More specifically, the flue gas treatment method comprises the following steps:
fuel/air mixture (gas) is input into the gas mixing chamber 13 from the radial gas inlet scroll 6, the gas is subjected to low-nitrogen combustion on the inner wall surface of the annular radiation screen 12 through the pores of the annular radiation screen 12 to form cylindrical film flame, the annular radiation screen 12 is also heated to about 900 ℃, oxygen-containing flue gas generated by the low-nitrogen combustion is discharged into the secondary combustion space 3 through the annular radiation screen 12, and the annular radiation screen 12 radiates heat to the secondary combustion space 3 at the same time;
meanwhile, the other path of return flue gas enters the secondary combustion space 3 from the air inlet 7 through one conical cylindrical porous medium core body 2 and is sprayed out from the air outlet 8 through the other conical cylindrical porous medium core body 5, and VOC is removed by the re-combustion of the flue gas in the process;
by adjusting the gas pressure in the secondary combustion space 3 and adjusting the gap between the two conical cylindrical porous medium cores 2 and 5, the reaction temperature and time of the flue gas in the secondary combustion space 3 can be controlled, so that combustible components in the flue gas can be completely reacted.
In a preferred mode, the afterburning control mode of the flue gas in the secondary combustion space 3 comprises the following steps:
oxygen-containing flue gas generated by low-nitrogen combustion is discharged into the secondary combustion space 3 along the direction vertical to the central shaft 4, and the pressure of the flue gas is higher than that of the flue gas input from the conical cylindrical porous medium core 2, so that the two paths of flue gas form tangential flow turbulent mixing heat transfer;
the two cone-shaped porous medium cores 2 and 5 absorb the radiant heat of the annular radiation screen 12 to heat the medium holes of the annular radiation screen, and the flue gas obtains heat to react when flowing through the high-temperature medium holes;
the gap between the two conical cylindrical porous medium cores 2 and 5 is adjusted, so that the pneumatic parameters of the secondary combustion space 3 are changed linearly, and the radiant energy of the flame is transmitted to the treated flue gas to the maximum extent.
At least some embodiments have the following advantages:
(1) High efficiency: at a set low-nitrogen combustion temperature, the gas is subjected to low-nitrogen combustion in a stationary reaction zone (annular radiation screen) by creating a porous medium structure of a combustion chamber and performing aerodynamic optimization. Meanwhile, a high-temperature flue gas backflow reburning process after combustion with a high excess air coefficient is established, so that the sensible heat of the flue gas and the oxygen which is not completely in the flue gas repeatedly participate in the subsequent combustion reaction, the flue gas waste heat can be recycled, and the oxygen in the large excess air coefficient of low-nitrogen combustion can provide beneficial support for the reburning process.
(2) High heat transfer: the inner wall surface of the cylindrical combustor forms low-nitrogen combustion, and simultaneously re-combustion is organized for the flue gas flowing from the upstream in three ways. The method comprises the following steps that firstly, a cylindrical combustor discharges smoke through a porous medium annular radiation screen, the direction of the cylindrical combustor is vertical to the axis of the combustor, and tangential flow turbulent mixing heat transfer is formed because the pressure of a smoke outlet of the annular radiation screen is greater than that of axially circulated backflow smoke; secondly, the axially introduced backflow flue gas passes through two symmetrically-installed cone-shaped porous medium cores, the pair of porous medium cores are synchronously heated by radiation of the annular radiation screens of the porous medium cores, and turbulent flue gas containing combustible components obtains more heat in the high-temperature medium holes and fully reacts. The distance between the conical tops of the two conical cylindrical porous medium cores is adjusted, so that the pneumatic parameters of a VOC central reaction area (secondary combustion space) between the two conical cylinders and the radiation screen annularly arranged on the outer sleeve can be linearly changed, the radiation energy of flame is transmitted to the treated flue gas to the maximum extent, and VOC elimination is completed.
(3) Low NOx: in the porous medium combination body with a special configuration, the gas equivalence ratio is increased along with the change of flow and is automatically adjusted in a set servo interval, so that the temperature of a reaction zone is constant at a design point (950 ℃ plus or minus 50 ℃), and stable low-nitrogen emission is formed. The annular radiation screen utilizes the corrugated structure thereof to provide unidirectional flowing axial force for the flame sprayed out from the mesh surface of the annular radiation screen.
(4) Low consumption: the sensible heat of the flue gas can be brought back to the combustion area by the reburning of the flue gas, the combustible components of the VOC can participate in the reaction, and the combustion reaction area forms an 'over-enthalpy' state, namely: the total heat in the reaction zone exceeds the heat contained in the primary fuel supply. Isothermal output results in a low loss state. From the combustion principle, low nitrogen starts from the reduction of flame temperature, and the method is to increase the excess air quantity and dope more cold air, so that the combustion reaction is slowed down. If the reaction zone is not prolonged (the combustion space is enlarged), the combustion efficiency is reduced, and the incomplete fuel and oxygen in the flue gas are increased. The establishment of the flue gas multi-cycle re-combustion mode can effectively squeeze combustible components in dry fuel gas and recycle flue gas waste heat, thereby forming the phenomenon of 'super enthalpy' at a given temperature section and ensuring the whole heating process flow to have low consumption.
(5) VOC elimination: for the heating system working condition, the VOC is generated because the heated object is heated (the heating temperature is lower than 500 ℃). Particularly, in a flameless heating state, VOC generated by a heated object is discharged along with smoke. The invention eliminates VOC in the flue gas by using the reburning of the flue gas in the porous medium with a special configuration. As a result, the VOC is exhausted while contributing heat.
(6) The combustion and the flue gas treatment are integrated, the efficiency of the whole machine is high, and the external energy is low. The invention constructs a combustion/re-combustion common type combustion chamber by the innovative design of the gas type low NOx combustor and the porous medium VOC re-combustion processor, so that the combustion is changed from vector single circulation to scalar multi-circulation, the contribution rate of the sensible heat of the flue gas to the heat of the system is improved, and the energy-saving effect is obvious and exact.
(7) The method is compact: the invention has compact structure, and combines multiple machine functions into a whole. So that the method has the advantages of high efficiency, material saving, environmental protection and production space saving.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for assisting the understanding of the present invention by those skilled in the art, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art under the spirit of the present invention shall be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a synchronous type industry flue gas of common mode is fired circulation processing module again which characterized in that: the treatment module comprises a cylindrical combustor (1) and two conical cylindrical porous medium cores (2 and 5), wherein the cylindrical combustor (1) comprises a cylinder (11) and an annular radiation screen (12) sleeved in the cylinder (11), a gas mixing chamber (13) is formed between the cylinder (11) and the annular radiation screen (12), a radial gas inlet scroll (6) communicated with the gas mixing chamber (13) is arranged at the outer side part of the cylinder (11), and a central shaft (4) is arranged at the center of the cylindrical combustor (1); the two conical cylindrical porous medium cores (2 and 5) are opposite in conical tops and symmetrically sleeved on the central shaft (4) of the cylindrical combustor (1) and can axially slide, a secondary combustion space (3) is formed between the two conical cylindrical porous medium cores (2 and 5) and the annular radiation screen (12), and the bottoms of the two cones respectively form a flue gas inlet (7) and a flue gas outlet (8);
from the outer layer to the inner layer, the annular radiation screen 12 sequentially comprises a mixed gas rectification cavity, a capillary nozzle layer, a cross-shaped passivation layer and a porous medium radiation layer; the mixed gas rectification cavity is used for constant pressure and constant flow, the capillary nozzle layer is used for preventing backfire, the cross blunt body layer is used as a flame setter, and the porous medium radiation layer is used for flame spreading.
2. The common-mode synchronous industrial flue gas after-combustion circulation processing module according to claim 1, characterized in that: the conical cylindrical porous medium cores (2 and 5) are made by protruding and elongating a circular plane porous medium along the axis, wherein the axis of a capillary hole is parallel to the central shaft (4) of the cylindrical combustor (1).
3. The utility model provides a synchronous type industry flue gas of common mode after combustion circulation processing apparatus which characterized in that: the processing device is formed by connecting a plurality of common mode synchronous type industrial flue gas re-combustion circulating processing modules in series and/or in parallel, and the common mode synchronous type industrial flue gas re-combustion circulating processing modules are the common mode synchronous type industrial flue gas re-combustion circulating processing modules according to any one of claims 1 to 2.
4. A common-mode synchronous industrial flue gas re-combustion circulating treatment method is characterized by comprising the following steps: configuring the common-mode synchronous industrial flue gas re-combustion cycle processing module of any one of claims 1 to 2; inputting fuel gas into the fuel gas mixing chamber (13) from the radial air inlet scroll (6), wherein the fuel gas is combusted at the inner wall surface of the annular radiation screen (12) in a low-nitrogen mode, the generated oxygen-containing flue gas is discharged into the secondary combustion space (3) through the annular radiation screen (12), and the annular radiation screen (12) radiates heat to the secondary combustion space (3); meanwhile, the other path of return flue gas enters the secondary combustion space (3) from a flue gas inlet (7) through one conical cylindrical porous medium core body (2) and is sprayed out from a flue gas outlet (8) through the other conical cylindrical porous medium core body (5); the gap between the two conical cylindrical porous medium cores (2 and 5) is adjusted to control the reaction temperature and time of the flue gas in the secondary combustion space 3, so that the combustible components in the flue gas can be completely reacted.
5. A common-mode synchronous industrial flue gas re-ignition cycle processing method according to claim 4, characterized in that the re-ignition control mode of the flue gas in the secondary combustion space (3) comprises at least one of the following modes: oxygen-containing flue gas generated by low-nitrogen combustion is discharged into the secondary combustion space (3) along the direction vertical to the central shaft (4), and the pressure of the discharged flue gas is greater than that of the flue gas input from the conical cylindrical porous medium core (2), so that the two paths of flue gas form tangential flow turbulent mixing heat transfer; the two cone-shaped porous medium cores (2 and 5) absorb the radiant heat of the annular radiation screen (12) to heat the medium holes of the annular radiation screen, and the flue gas obtains heat to react when flowing through the high-temperature medium holes; the gap between the two conical cylindrical porous medium cores (2 and 5) is adjusted to ensure that the pneumatic parameters of the secondary combustion space (3) are changed linearly, and the radiation energy of the flame is transmitted to the treated flue gas to the maximum extent.
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