Flue gas treatment method and flue gas treatment system

Abstract

The present invention discloses a flue gas treatment method and a flue gas treatment system. The flue gas treatment method includes: performing a first cooling treatment on the flue gas from the melting furnace to reduce the temperature of the flue gas to 950 - 1050 °C; performing SNCR denitrification treatment on the flue gas after the first cooling treatment; performing a second cooling treatment on the flue gas after the SNCR denitrification treatment to reduce the temperature of the flue gas to 480 °C - 520 °C; performing conditioning treatment on the flue gas after the second cooling treatment; performing dust removal treatment on the flue gas after the conditioning treatment; and performing boron removal treatment on the flue gas after the dust removal treatment. The technical solution of the present invention reduces the pollution of the flue gas to the surrounding environment by performing treatments such as cooling, conditioning, denitrification, dust removal, and boron removal on the flue gas from the melting furnace, so that the flue gas meets the emission standards.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and particularly relates to a flue gas treatment method and a flue gas treatment system. Background Art

[0002] Compared with ordinary soda-lime-silica glass, borosilicate glass has greatly improved mechanical properties, thermal stability, water resistance, alkali resistance, acid resistance, etc. Therefore, it is widely used in many industries such as aerospace, military, chemical industry, medicine, fire protection, household appliances, etc., and has good application value and social benefits.

[0003] The production of borosilicate glass requires adding a certain proportion of boron compounds to the batch material. According to the boron content of the product, the mass ratio of boron compounds in the batch material can be as high as 15%. During the glass melting process, factors such as high temperature and water vapor in the melting furnace will cause a large amount of B2O3 to volatilize. The volatilization of B2O3 not only wastes a large amount of raw materials and increases the material cost, but also seriously erodes the refractory material of the melting furnace and shortens the service life of the melting furnace. At the same time, B2O3 is discharged into the atmosphere with the flue gas and will combine with water in the air to form boric acid to form acid rain. If the flue gas of the melting furnace is not treated, it will cause serious pollution to the surrounding ecological environment.

[0004] Since the domestic borosilicate glass industry started relatively late, the corresponding flue gas treatment process is also lacking. At present, the flue gas treatment facilities in the borosilicate glass industry basically only treat dust and do not specifically treat B2O3 in the flue gas. Due to the lack of specific treatment of B2O3 in the flue gas, the flue gas discharge from the borosilicate glass melting furnace causes serious pollution to the surrounding ecological environment. Summary of the Invention

[0005] The main object of the present invention is to propose a flue gas treatment method, aiming to specifically treat the flue gas of the borosilicate glass melting furnace and reduce the pollution of the flue gas to the surrounding ecological environment.

[0006] To achieve the above object, the flue gas treatment method proposed by the present invention includes:

[0007] Performing a first temperature reduction treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 950 - 1050 °C;

[0008] Performing SNCR denitrification treatment on the flue gas after the first temperature reduction treatment;

[0009] Performing a second temperature reduction treatment on the flue gas after SNCR denitrification treatment to reduce the flue gas temperature to 480 - 520 °C;

[0010] Performing conditioning treatment on the flue gas after the second temperature reduction treatment;

[0011] Dust removal treatment is carried out on the flue gas after quenching and tempering treatment;

[0012] Boron removal treatment is carried out on the flue gas after dust removal treatment.

[0013] Preferably, the quenching and tempering treatment specifically includes: spraying a quenching and tempering agent and water into the quenching and tempering tower, and reacting the flue gas with the quenching and tempering agent and water at a temperature of 380°C to 420°C.

[0014] Preferably, the cooling treatment includes: introducing cold air into the flue gas, or spraying water mist into the flue gas, or cooling through a waste heat boiler.

[0015] Preferably, the dust removal treatment includes: using ceramic fiber tube dust removal or bag type dust removal.

[0016] Preferably, the boron removal treatment includes: absorbing and removing B2O3 in the flue gas with an alkali solution in a washing tower.

[0017] The present invention also proposes another flue gas treatment method, including:

[0018] Cooling treatment is carried out on the flue gas from the melting furnace to reduce the flue gas temperature to 480°C to 520°C;

[0019] Quenching and tempering treatment is carried out on the flue gas after cooling treatment;

[0020] SCR denitrification and dust removal integrated treatment is carried out on the flue gas after quenching and tempering treatment;

[0021] Boron removal treatment is carried out on the flue gas after SCR denitrification and dust removal integrated treatment.

[0022] The present invention also proposes another flue gas treatment method, including:

[0023] Cooling treatment is carried out on the flue gas from the melting furnace to reduce the flue gas temperature to 480°C to 520°C;

[0024] Quenching and tempering treatment is carried out on the flue gas after cooling treatment;

[0025] Dust removal treatment is carried out on the flue gas after quenching and tempering treatment;

[0026] SCR denitrification treatment is carried out on the flue gas after dust removal treatment;

[0027] Boron removal treatment is carried out on the flue gas after SCR denitrification treatment.

[0028] The present invention also proposes a flue gas treatment system, including:

[0029] A cooling device for cooling treatment of the flue gas;

[0030] A quenching and tempering device for modulating treatment of the flue gas;

[0031] A dust removal device for dust removal treatment of flue gas;

[0032] A denitration device for SNCR denitration treatment or SCR denitration treatment of flue gas; and,

[0033] A boron removal device for boron removal treatment of flue gas.

[0034] Preferably, the dust removal device includes a ceramic fiber tube dust removal device or a bag type dust removal device.

[0035] Preferably, the boron removal device includes a plurality of boron removal sub-devices, and the plurality of boron removal sub-devices can operate in series, in parallel, or independently.

[0036] The technical solution of the present invention reduces the pollution of flue gas to the surrounding environment by cooling, conditioning, denitrating, dust removing, boron removing, etc. the flue gas from the melting furnace, so that the flue gas meets the emission standards. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0038] Figure 1 It is a schematic flow chart of an embodiment of the flue gas treatment method of the present invention;

[0039] Figure 2 It is a schematic flow chart of another embodiment of the flue gas treatment method of the present invention;

[0040] Figure 3 It is a schematic flow chart of yet another embodiment of the flue gas treatment method of the present invention;

[0041] Figure 4 It is a schematic structural diagram of an embodiment of the flue gas treatment system of the present invention;

[0042] Figure 5 It is a schematic structural diagram of another embodiment of the flue gas treatment system of the present invention;

[0043] Figure 6 It is a schematic structural diagram of yet another embodiment of the flue gas treatment system of the present invention.

[0044] Explanation of the Reference Numerals in the Drawings:

[0045]

[0046]

[0047] The realization, functional features and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. Specific embodiments

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0050] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0051] The present invention provides a flue gas treatment method for specifically treating the flue gas of a borosilicate glass melting furnace and reducing the pollution of the flue gas to the surrounding ecological environment.

[0052] In an embodiment of the present invention, as Figure 1 shown, the flue gas treatment method includes the following steps:

[0053] S11. Perform a first cooling treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 950 - 1050 °C;

[0054] S12. Perform SNCR denitrification treatment on the flue gas after the first cooling treatment;

[0055] S13. Perform a second cooling treatment on the flue gas after SNCR denitrification treatment to reduce the flue gas temperature to 480 °C - 520 °C;

[0056] S14. Temper the flue gas after the second temperature reduction treatment;

[0057] S15. Remove dust from the flue gas after the tempering treatment;

[0058] S16. Remove boron from the flue gas after the dust removal treatment.

[0059] It should be noted that the above flue gas treatment method is applicable to the case where the NOx concentration in the melting furnace flue gas is relatively low (≤1000mg / Nm 3 ).

[0060] Specifically, for the temperature reduction treatment of the flue gas (including the first and second times), methods such as introducing cold air into the flue gas, spraying water mist into the flue gas, or reducing the temperature through a waste heat boiler can be adopted. Both cold air and water mist are much lower in temperature than the flue gas. After mixing with the flue gas, the temperature of the flue gas can be reduced. In addition, reducing the temperature through the waste heat boiler means introducing high-temperature flue gas into the waste heat boiler, allowing the flue gas to exchange heat with the water in the waste heat boiler, heating the water in the waste heat boiler for other uses. And the temperature of the flue gas decreases due to the heat exchange with the water in the waste heat boiler.

[0061] Since the reaction temperature of SNCR denitrification treatment is around 1000°C, the first temperature reduction treatment needs to reduce the flue gas temperature to between 950 and 1050°C. Since the reaction temperature of the tempering treatment is around 400°C, the second temperature reduction treatment needs to reduce the flue gas temperature to between 480°C and 520°C in advance.

[0062] In the present invention, SNCR (Selective Non-Catalytic Reduction) denitrification treatment is selective non-catalytic reduction denitrification treatment. This technology does not use a catalyst and sprays an amino reducing agent at an appropriate position in the flue gas system to reduce NOx to N2. The reaction temperature of SNCR denitrification treatment is around 1000°C, and the residence time in the flue duct is long, so the reaction is sufficient. Currently, SNCR denitrification technology mainly uses ammonia water as the reducing agent, and its main reaction equations are as follows:

[0063] 4NO + 4NH3 + O2 → 4N2 + 6H2O

[0064] 2NO + 4NH3 + 2O2 → 3N2 + 6H2O.

[0065] In the present invention, the quenching and tempering treatment specifically includes: spraying a quenching and tempering agent and water into a quenching and tempering tower, and enabling the flue gas to react with the quenching and tempering agent and water at a temperature of 380°C to 420°C. Spraying water into the quenching and tempering tower can not only play a role in cooling, reducing the temperature of the flue gas from 480°C to 520°C to 380°C to 420°C, but also form a microscopic wet method in the quenching and tempering tower, which is beneficial to improving the efficiency of subsequent denitrification and boron removal. The quenching and tempering agent can be slaked lime, quicklime, soda ash, etc.

[0066] In the present invention, the dust removal treatment includes: using ceramic fiber tube dust removal or bag type dust removal. The ceramic fiber tube dust removal has a wide applicable temperature range and has relatively low requirements for controlling the flue gas temperature at the front-end inlet; the bag type dust removal requires strict control of the flue gas temperature at the front-end inlet and is prone to problems such as bag sticking, but the bag type dust removal has a low cost. It can be selected according to specific actual needs, either ceramic fiber tube dust removal or bag type dust removal.

[0067] In the present invention, the boron removal treatment includes: absorbing and removing B2O3 in the flue gas with an alkali solution in a scrubbing tower. Multiple scrubbing towers can be provided, and the multiple scrubbing towers can operate in series, in parallel, or independently. Preferably, the multiple scrubbing towers operate in parallel. In this way, when one of the scrubbing towers is under maintenance, the other scrubbing towers can still operate normally and the flue gas treatment is not affected. The alkali solution is an aqueous solution of sodium hydroxide or potassium hydroxide. In the present invention, an alkali solution is sprayed into the scrubbing tower through a circulation pump to absorb B2O3 in the flue gas. The alkali solution can be recycled repeatedly, and by adding new alkali solution, a reasonable pH value is controlled, so as to achieve the best boron removal effect and the lowest operating cost.

[0068] The technical solution of the present invention reduces the pollution of the flue gas to the surrounding environment by cooling, quenching and tempering, denitrifying, dust removing, boron removing and other treatments on the flue gas from the melting furnace, so that the flue gas meets the emission standards.

[0069] The present invention also provides another flue gas treatment method for specifically treating the flue gas from a borosilicate glass melting furnace and reducing the pollution of the flue gas to the surrounding ecological environment.

[0070] In an embodiment of the present invention, as Figure 2 shown, the flue gas treatment method includes:

[0071] S21. Cooling the flue gas from the melting furnace to make the flue gas temperature drop to 480°C to 520°C;

[0072] S22. Performing quenching and tempering treatment on the cooled flue gas;

[0073] S23. Performing an integrated treatment of SCR denitrification and dust removal on the quenched and tempered flue gas;

[0074] S24. Perform boron removal treatment on the flue gas after SCR denitrification and integrated dust removal treatment.

[0075] It should be noted that the above flue gas treatment method is applicable to the case where the NOx concentration in the flue gas of the melting furnace is relatively high (>1000 mg / Nm 3 ). At the same time, the technical prerequisite for selecting this method is that the sulfur content of the flue gas entering the ceramic fiber tube should be as low as possible to avoid the generation of ammonium bisulfate or ammonium sulfate in the ceramic fiber tube.

[0076] SCR (Selective Catalytic Reduction) denitrification, that is, selective catalytic reduction denitrification, refers to the reduction of NO and NO2 in the flue gas to non-toxic N2 and H2O by the reducing agent NH3 at about 400 °C under the action of a catalyst (such as TiO2, V2O5, WO3), with almost no oxidation reaction of NH3 occurring, thereby reducing the consumption of NH3.

[0077] The integrated SCR denitrification and dust removal treatment in the present invention means that denitrification and dust removal are completed in a ceramic fiber tube dust collector. The filter material of this dust collector uses ceramic fiber tubes, and at the same time, a catalyst (such as TiO2, V2O5, WO3) is adsorbed on the surface of the ceramic fiber tubes, which can not only remove dust but also denitrify. Ammonia gas is sprayed into the flue gas before it enters the ceramic fiber tube dust collector for denitrification; at the same time, slaked lime is sprayed to neutralize the acidic gases in the original flue gas and also form a coating on the sticky dust such as sodium oxide and potassium oxide in the original flue gas, which is beneficial to back blowing and dust cleaning.

[0078] For the cooling treatment, conditioning treatment, dust removal treatment and boron removal treatment in the present invention, reference can be made to the foregoing explanations and will not be elaborated here.

[0079] The present invention also proposes another flue gas treatment method for specifically treating the flue gas of a borosilicate glass melting furnace to reduce the pollution of the flue gas to the surrounding ecological environment.

[0080] In an embodiment of the present invention, as Figure 3 shown, the flue gas treatment method includes:

[0081] S31. Perform cooling treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 480 °C - 520 °C;

[0082] S32. Perform conditioning treatment on the flue gas after cooling treatment;

[0083] S33. Perform dust removal treatment on the flue gas after conditioning treatment;

[0084] S34. Perform SCR denitrification treatment on the flue gas after dust removal treatment;

[0085] S35. Perform boron removal treatment on the flue gas after SCR denitrification treatment.

[0086] It should be noted that the above flue gas treatment method is applicable to the case where the NOx concentration in the flue gas of the melting furnace is relatively high (> 1000 mg / Nm 3 ).

[0087] SCR (Selective Catalytic Reduction) denitration, that is, selective catalytic reduction denitration, refers to the reduction of NO and NO2 in the flue gas to non-toxic N2 and H2O by the reducing agent NH3 at about 400 °C under the action of a catalyst (such as TiO2, V2O5, WO3), with almost no oxidation reaction of NH3 occurring, thereby reducing the consumption of NH3.

[0088] For the cooling treatment, conditioning treatment, dust removal treatment and boron removal treatment in the present invention, reference can be made to the foregoing explanations and will not be elaborated here.

[0089] The present invention also provides a flue gas treatment system for specifically treating the flue gas of a borosilicate glass melting furnace and reducing the pollution of the flue gas to the surrounding ecological environment. The flue gas treatment system includes:

[0090] A cooling device 10 for cooling the flue gas;

[0091] A conditioning device 20 for conditioning the flue gas;

[0092] A dust removal device 30 for removing dust from the flue gas;

[0093] A denitration device for performing SNCR denitration treatment or SCR denitration treatment on the flue gas; and,

[0094] A boron removal device 50 for removing boron from the flue gas.

[0095] As Figure 4 、 Figure 5 or Figure 6 shown, the cooling device 10 includes a cold air blower, and the cold air blower blows cold air into the flue. It can be understood that the cooling device can also be a water mist spraying device, and the water mist spraying device sprays water mist into the flue. Both cold air and water mist are much lower in temperature than the flue gas, and after mixing with the flue gas, the temperature of the flue gas can be reduced.

[0096] As Figure 4 、 Figure 5 or Figure 6As shown, the tempering equipment 20 includes a tempering tower 21, a tempering agent silo 22, a water tank 23, and a water pump 24. The tempering agent silo 22 supplies the tempering agent into the tempering tower 21, and the water pump 24 sprays the water in the water tank 23 into the tempering tower 21. The tempering agent is sprayed into the tempering tower 21 to coat and modify the alkali metal oxides and other chemical raw material fly ash in the flue gas, reducing problems such as blockage, bag sticking, and caking in the subsequent processes. The water pump 24 pumps the water in the water tank 23 into the tempering tower 21, and adding water can form a microscopic wet method in the tempering tower 21, which is beneficial to improving the efficiency of acid and boron removal.

[0097] As Figure 4 , Figure 5 or Figure 6 As shown, the dust removal equipment 30 includes a plurality of dust collectors 31, and the plurality of dust collectors are connected in parallel. The dust collector 30 is a ceramic fiber tube dust collector or a bag filter. The ceramic fiber tube dust collector has a wide applicable temperature range and has low requirements for controlling the flue gas temperature at the front-end inlet; the bag filter requires strict control of the flue gas temperature at the front-end inlet and is prone to problems such as bag sticking, but the bag filter has a low cost. The ceramic fiber tube dust collector or the bag filter can be selected according to specific actual needs.

[0098] As Figure 4 , Figure 5 or Figure 6 As shown, the boron removal equipment 50 includes a plurality of scrubbers 51, and the plurality of scrubbers 51 are connected in parallel or in series. In addition, the boron removal equipment 50 further includes an alkali liquid tank 52 and an alkali liquid pump 53, and the alkali liquid pump 53 sprays the alkali liquid in the alkali liquid tank 52 into the scrubber 51. During operation, the alkali liquid pump 53 pumps the alkali liquid in the alkali liquid tank 52 into the scrubber 51, and the alkali liquid reacts with B2O3 in the scrubber 51, thereby realizing the absorption and removal of B2O3 in the flue gas. When the plurality of scrubbers 51 are connected in series, the flue gas undergoes multi-stage boron removal treatment, and the boron removal effect of the flue gas is better. When the plurality of scrubbers 52 are connected in parallel, online maintenance can be realized, avoiding the direct discharge of flue gas into the atmosphere during maintenance.

[0099] Further, as Figure 4 , Figure 5 or Figure 6 As shown,, the boron removal equipment 50 further includes a stirrer 54, and the stirring end of the stirrer 54 extends into the alkali liquid tank 53. The alkali liquid in the alkali liquid tank 53 can be circulated repeatedly, and the alkali liquid in the alkali liquid tank 53 can control a reasonable pH value by adding new alkali materials, so as to achieve the best boron removal effect and the lowest operating cost. When adding new alkali materials, start the stirrer 54 to make the new alkali liquid stir evenly in the alkali liquid tank 53 and dissolve quickly.

[0100] In addition, the flue gas treatment system of the present invention further includes an induced draft fan 60 and a chimney 70. Through the induced draft fan and the chimney, the treated flue gas is discharged into the atmosphere.

[0101] In an embodiment of the present invention, as Figure 4 shown, the denitration device is specifically an SNCR denitration device 41. The cooling device 10 includes a first cold air fan 11 and a second cold air fan 12. The flue gas treatment system sequentially includes a first cold air fan 11, an SNCR denitration device 41, a second cold air fan 12, a conditioning device 20 (including a conditioning tower, a water tank, a conditioning agent silo, and a multi-stage water pump), a dust removal device 30 (including a plurality of dust collectors), a boron removal device 50 (including a plurality of scrubbers, an alkali liquid tank, and a multi-stage alkali liquid pump), an induced draft fan 60, a chimney 70, etc. in the flow direction of the flue gas. After the first temperature reduction treatment by the first cold air fan 11, the temperature of the flue gas drops to between 950 °C and 1050 °C, and then it enters the SNCR denitration device 41 for denitration reaction. After the second temperature reduction treatment by the second cold air fan 12, the temperature drops to between 480 °C and 520 °C, and then it enters the conditioning device 20 for conditioning treatment.

[0102] In the present invention, SNCR (Selective Non-Catalytic Reduction) denitration treatment is selective non-catalytic reduction denitration treatment. This technology does not use a catalyst and injects an amino reducing agent at an appropriate position in the flue gas system to reduce NOx to N2. The reaction temperature of SNCR denitration treatment is about 1000 °C, and the residence time in the flue duct is long, and the reaction is sufficient. Currently, the SNCR denitration technology mainly uses ammonia water as the reducing agent, and its main reaction equations are as follows:

[0103] 4NO + 4NH3 + O2 → 4N2 + 6H2O

[0104] 2NO + 4NH3 + 2O2 → 3N2 + 6H2O.

[0105] In another embodiment of the present invention, as Figure 5 shown, the denitration device and the dust removal device are integrated. The dust removal device 30 includes a plurality of ceramic fiber tube dust collectors. The surface of the ceramic fiber tubes of the ceramic fiber tube dust collectors adsorbs catalysts (such as TiO2, V2O5, WO3), which can not only remove dust but also denitrate. Ammonia gas is injected before the flue gas enters the ceramic fiber tube dust collectors for denitration; at the same time, slaked lime is injected to neutralize the acidic gases in the original flue gas and also form a coating on the sticky dust such as sodium oxide and potassium oxide in the original flue gas, which is beneficial for back blowing and dust cleaning.

[0106] The flue gas treatment system sequentially includes a first cold air fan 11, a conditioning device 20 (including a conditioning tower, a water tank, a conditioning agent silo, and a multi-stage water pump), a dust removal device 30 (including a plurality of dust collectors), a boron removal device 50 (including a plurality of scrubbers, an alkali solution tank, and a multi-stage alkali solution pump), an induced draft fan 60, a chimney 70, etc. in the flow direction of the flue gas.

[0107] In another embodiment of the present invention, as Figure 6 shown, the denitration device is an SCR denitration device 42, and the flue gas treatment system sequentially includes a first cold air fan 11, a conditioning device 20 (including a conditioning tower, a water tank, a conditioning agent silo, and a multi-stage water pump), a dust removal device 30 (including a plurality of dust collectors), an SCR denitration device 42, a boron removal device 50 (including a plurality of scrubbers, an alkali solution tank, and a multi-stage alkali solution pump), an induced draft fan 60, a chimney 70, etc. in the flow direction of the flue gas. The flue gas of the melting furnace is sequentially subjected to treatments such as cooling, conditioning, dust removal, SCR denitration, and boron removal, and then discharged into the atmosphere.

[0108] SCR (Selective Catalytic Reduction) denitration, that is, selective catalytic reduction denitration, means that under the action of a catalyst (such as TiO2, V2O5, WO3), the reducing agent NH3 reduces NO and NO2 in the flue gas into non-toxic N2 and H2O at about 400 °C, and almost no oxidation reaction of NH3 occurs, thereby reducing the consumption of NH3.

[0109] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A flue gas treatment method, characterized in that, Including: Conduct the first cooling treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 950 - 1050 °C; Conduct SNCR denitrification treatment on the flue gas after the first cooling treatment; Conduct the second cooling treatment on the flue gas after SNCR denitrification treatment to reduce the flue gas temperature to 480 °C - 520 °C; Conduct conditioning treatment on the flue gas after the second cooling treatment; Conduct dust removal treatment on the flue gas after conditioning treatment; Conduct boron removal treatment on the flue gas after dust removal treatment; Wherein, the conditioning treatment specifically includes: spraying a conditioning agent and water into the conditioning tower to make the flue gas react with the conditioning agent and water at a temperature of 380 °C - 420 °C; the conditioning agent includes slaked lime and quicklime; The cooling treatment includes: introducing cold air into the flue gas, or spraying water mist into the flue gas, or cooling through a waste heat boiler; The dust removal treatment includes: using ceramic fiber tube dust removal or bag type dust removal; The boron removal treatment includes: using an alkali solution in the scrubbing tower to absorb and remove B2O3 in the flue gas.

2. A flue gas treatment method, characterized in that, Including: Conduct a cooling treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 480 °C - 520 °C; Conduct conditioning treatment on the flue gas after the cooling treatment; Conduct integrated SCR denitrification and dust removal treatment on the flue gas after conditioning treatment; Conduct boron removal treatment on the flue gas after integrated SCR denitrification and dust removal treatment; Wherein, the conditioning treatment specifically includes: spraying a conditioning agent and water into the conditioning tower to make the flue gas react with the conditioning agent and water at a temperature of 380 °C - 420 °C; the conditioning agent includes slaked lime and quicklime; The cooling treatment includes: introducing cold air into the flue gas, or spraying water mist into the flue gas, or cooling through a waste heat boiler; The dust removal treatment includes: using ceramic fiber tube dust removal or bag type dust removal; The boron removal treatment includes: using an alkali solution in the scrubbing tower to absorb and remove B2O3 in the flue gas.

3. A flue gas treatment method, characterized in that Including: Conduct a cooling treatment on the flue gas from the melting furnace to reduce the flue gas temperature to 480 °C - 520 °C; Conduct conditioning treatment on the flue gas after the cooling treatment; Conduct dust removal treatment on the flue gas after conditioning treatment; Conduct SCR denitrification treatment on the flue gas after dust removal treatment; Conduct boron removal treatment on the flue gas after SCR denitrification treatment; Wherein, the conditioning treatment specifically includes: spraying a conditioning agent and water into the conditioning tower to make the flue gas react with the conditioning agent and water at a temperature of 380 °C - 420 °C; the conditioning agent includes slaked lime and quicklime; The cooling treatment includes: introducing cold air into the flue gas, or spraying water mist into the flue gas, or cooling through a waste heat boiler; The dust removal treatment includes: using ceramic fiber tube dust removal or bag type dust removal; The boron removal treatment includes: using an alkali solution in the scrubbing tower to absorb and remove B2O3 in the flue gas.

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