Flue gas desulfurization device and industrial kiln flue gas purification and waste heat utilization system

Abstract

The utility model discloses a flue gas desulfurization device and an industrial kiln flue gas purification and waste heat utilization system, the flue gas desulfurization device comprises: a flue gas input structure for receiving flue gas to be desulfurized; the flue gas output structure is used for outputting the desulfurized flue gas; the dual-rectangular-shaped desulfurization flue is connected between the flue gas input structure and the flue gas output structure, and the two ends of the dual-rectangular-shaped desulfurization flue are connected with the flue gas input structure and the flue gas output structure respectively; the desulfurizing agent input structure is used for adding a desulfurizing agent into the flue gas to be desulfurized and / or the flue gas in the concentric-square-shaped desulfurization flue; during working, to-be-desulfurized flue gas supply side equipment corresponding to the flue gas input structure and desulfurized flue gas receiving side equipment corresponding to the flue gas output structure are distributed on the two sides of a plane formed by the center lines of the concentric-square-shaped desulfurization flue.

Description

Technical Field

[0001] The present disclosure relates to the technical field of industrial furnace flue gas treatment, specifically including: industrial furnace flue gas purification and waste heat utilization systems, dust removal and denitrification devices, flue gas desulfurization devices, flue gas waste heat recovery devices, and industrial silicon smelting flue gas purification and waste heat utilization systems. Background Art

[0002] The applicant provided an industrial silicon smelting flue gas treatment system in the patent document with the publication number CN114887409A. First, the industrial silicon smelting flue gas with a temperature of 450°C - 650°C discharged from the industrial silicon smelting furnace is adjusted to the first cooled flue gas with a temperature of 300°C - 450°C through the first waste heat boiler unit. Then, the first cooled flue gas is filtered and dust-removed and purified by the flue gas filtration and dust removal unit, and then adjusted to the dust-removed flue gas. Next, the dust-removed flue gas is denitrified by the SCR denitrification reactor unit to obtain the denitrified flue gas. After that, the denitrified flue gas is adjusted to the second cooled flue gas with a temperature of 100°C - 200°C through the second waste heat boiler unit, and the second cooled flue gas finally enters the desulfurization device for desulfurization. In practical applications, the following technical problems are found in this industrial silicon smelting flue gas treatment system.

[0003] First, the desulfurization device is arranged after the second waste heat boiler unit. When the dry desulfurization method is selected for the desulfurization device, since the tail gas after dry desulfurization will be mixed with a certain concentration of particulate matter (the particulate matter includes the remaining desulfurizing agent and the reaction product of the desulfurizing agent and sulfur dioxide), it is necessary to set up dust removal equipment after the desulfurization device, resulting in a relatively long process flow of the industrial silicon smelting flue gas treatment system, and further increasing the occupied length of the industrial silicon smelting flue gas treatment system. In addition, the desulfurization device usually uses a desulfurization tower, which has a large diameter and a high height, significantly increasing the floor area of the industrial silicon smelting flue gas treatment system.

[0004] Second, the temperature range of the second cooled flue gas output by the second waste heat boiler unit is unreasonable. When the temperature of the second cooled flue gas output by the second waste heat boiler unit is lower than 140°C, sulfur dioxide in the second cooled flue gas is likely to condense in the form of acid, causing serious pipeline corrosion. When the temperature of the second cooled flue gas output by the second waste heat boiler unit is higher than 160°C, the waste heat utilization is insufficient.

[0005] Third, the working principle of the SCR denitrification reactor unit is to reduce nitrogen oxides in the dust-removed flue gas to nitrogen and water by injecting ammonia (SCR denitrification reducing agent) into the dust-removed flue gas under the action of a catalyst. In order to provide ammonia, usually, ammonia water is heated to 130°C - 150°C by a heater; however, this method has high energy consumption and reduces the economic efficiency of the operation of the industrial silicon smelting flue gas treatment system.

[0006] Fourth, although the applicant also assembles the first waste heat recovery unit and the second waste heat recovery unit into an integrated heat exchange device on the basis of the above industrial silicon smelting flue gas treatment system, the flue duct structure connected to the integrated heat exchange device is complex, increasing the flue duct construction cost and also increasing the air flow pressure loss. Summary of the Utility Model

[0007] One of the objectives of the present disclosure is to provide an industrial furnace flue gas purification and waste heat utilization system to solve the problem that the process flow of the industrial silicon smelting flue gas treatment system in the background technology is relatively long, resulting in a relatively long occupied length of the industrial silicon smelting flue gas treatment system.

[0008] In this regard, in the first aspect, an industrial furnace flue gas purification and waste heat utilization system is provided, including: a first waste heat boiler unit for obtaining the industrial furnace flue gas and performing first waste heat recovery and then outputting a first cooled flue gas; a first flue gas filtration and dust removal unit for obtaining the first cooled flue gas and physically intercepting the dust in the first cooled flue gas through a filter element and then outputting a first dust-removed flue gas; an SCR denitration reactor unit for obtaining the first dust-removed flue gas added with an SCR denitration reducing agent and outputting a denitrated flue gas through an SCR denitration catalyst; a second waste heat boiler unit for obtaining the denitrated flue gas and performing second waste heat recovery and then outputting a second cooled flue gas; a flue gas desulfurization unit for obtaining the second cooled flue gas added with a desulfurizing agent and performing desulfurization and then outputting a desulfurized flue gas; the first waste heat boiler unit and the second waste heat boiler unit are both arranged in a first ground area, the first flue gas filtration and dust removal unit and the SCR denitration reactor unit are both arranged in a second ground area, the flue gas desulfurization unit and the subsequent flue gas treatment equipment of the flue gas desulfurization unit are arranged in a third ground area, the first ground area and the second ground area are arranged opposite to each other, and the third ground area is located between the first ground area and the second ground area.

[0009] Through the reasonable spatial layout of the first waste heat boiler unit, the first flue gas filtration and dust removal unit, the SCR denitration reactor unit, the second waste heat boiler unit, the flue gas desulfurization unit, and the subsequent flue gas treatment equipment of the flue gas desulfurization unit in the above industrial furnace flue gas purification and waste heat utilization system, the space occupation of the industrial furnace flue gas purification and waste heat utilization system is made compact, which helps to shorten the occupied length of the industrial silicon smelting flue gas treatment system and save project land occupation.

[0010] Another objective of the present disclosure is to provide an industrial furnace flue gas purification and waste heat utilization system to solve the problem that the temperature range of the second cooled flue gas output by the second waste heat boiler unit in the industrial silicon smelting flue gas treatment system in the background technology is unreasonable.

[0011] In this regard, in the second aspect, an industrial furnace flue gas purification and waste heat utilization system is provided, including: a first waste heat boiler unit for obtaining the industrial furnace flue gas and performing first waste heat recovery and then outputting a first cooled flue gas; a first flue gas filtration and dust removal unit for obtaining the first cooled flue gas and physically intercepting the dust in the first cooled flue gas through a filter element and then outputting a first dedusted flue gas; an SCR denitration reactor unit for obtaining the first dedusted flue gas added with an SCR denitration reducing agent and passing it through an SCR denitration catalyst and then outputting a denitrified flue gas; a second waste heat boiler unit for obtaining the denitrified flue gas and performing second waste heat recovery and then outputting a second cooled flue gas; the first waste heat boiler unit uses a waste heat boiler with an output temperature of the first cooled flue gas of 260°C - 360°C, and the second waste heat boiler unit uses a waste heat boiler with an output temperature of the second cooled flue gas of 140°C - 160°C.

[0012] The temperature of the first cooled flue gas output by the first waste heat boiler unit of the above industrial furnace flue gas purification and waste heat utilization system is 260°C - 360°C (optionally, the first waste heat boiler unit uses a waste heat boiler with an output temperature of the first cooled flue gas of ≥260°C and less than 300°C or uses a waste heat boiler with an output temperature of the first cooled flue gas of greater than 300°C and ≤360°C), and the temperature of the second cooled flue gas used by the second waste heat boiler unit is 140°C - 160°C. The temperature of the first cooled flue gas of 260°C - 360°C output by the first waste heat boiler unit is very suitable for medium-high temperature SCR denitration reaction. In this temperature range, the activity of the medium-high temperature SCR denitration catalyst is the best. The temperature of the second cooled flue gas of 140°C - 160°C output by the second waste heat boiler unit is both higher than the dew point temperatures of water and acid in the second cooled flue gas, which can prevent condensation and the resulting corrosion problems in the flue gas system. And, the temperature of the second cooled flue gas can ensure the maximization of energy efficiency under the condition of effectively avoiding acid condensation.

[0013] In addition, the temperature difference between the inlet and outlet of the second waste heat boiler unit is relatively small (if considering a 20°C drop in temperature from the first cooled flue gas to the denitrified flue gas, then the temperature difference between the inlet and outlet of the second waste heat boiler unit drops from 240°C - 340°C to 140°C - 160°C). Therefore, it allows the second waste heat boiler unit to adopt a more compact design, reduce thermal stress, and extend the equipment life; the second waste heat boiler unit can also use more economical materials, such as carbon steel, to significantly reduce the manufacturing cost; the lower operating temperature and simplified structure of the second waste heat boiler unit make the maintenance and cleaning of the second waste heat boiler unit easier, greatly reducing the downtime and maintenance cost of the second waste heat boiler unit; due to the relatively small temperature difference between the inlet and outlet of the second waste heat boiler unit, the heat transfer surface design can be optimized, such as using denser fins, to improve the heat transfer efficiency per unit area.

[0014] A third object of the present disclosure is to provide a dust removal and denitration device and a smelting flue gas purification and waste heat utilization system for industrial silicon, so as to solve the problem of high energy consumption of the SCR denitration reactor unit in the industrial silicon smelting flue gas treatment system in the background art.

[0015] In view of this, in a third aspect, a dust removal and denitration device is provided, including: a flue gas dust collector unit for obtaining the flue gas to be dust-removed and outputting the dust-removed flue gas after dust removal; an SCR denitration reactor unit for obtaining the dust-removed flue gas added with an SCR denitration reducing agent and outputting the denitrated flue gas after passing through an SCR denitration catalyst; an SCR denitration reducing agent supply unit for adding the SCR denitration reducing agent to the conveying channel of the flue gas to be dust-removed and / or the conveying channel of the dust-removed flue gas; the SCR denitration reducing agent supply unit includes a diversion device and an evaporation device, the diversion device includes a diversion channel and a draft fan arranged on the diversion channel, the inlet of the diversion channel is connected to the conveying channel of the dust-removed flue gas and / or the conveying channel of the denitrated flue gas, the outlet of the diversion channel is connected to the evaporation device, and the evaporation device uses the flue gas output by the diversion device to heat the liquid SCR denitration reducing agent to convert the liquid SCR denitration reducing agent into a gaseous SCR denitration reducing agent and convey it to the conveying channel of the flue gas to be dust-removed and / or the conveying channel of the dust-removed flue gas.

[0016] In a fourth aspect, a smelting flue gas purification and waste heat utilization system for industrial silicon is provided, including: a first waste heat boiler unit for obtaining the smelting flue gas and performing first waste heat recovery and then outputting the first cooled flue gas; a first flue gas filtration and dust collector unit for obtaining the first cooled flue gas and physically intercepting the dust in the first cooled flue gas through a filter element and then outputting the first dust-removed flue gas; an SCR denitration reactor unit for obtaining the first dust-removed flue gas added with an SCR denitration reducing agent and outputting the denitrated flue gas after passing through an SCR denitration catalyst; an SCR denitration reducing agent supply unit for adding the SCR denitration reducing agent to the conveying channel of the industrial furnace flue gas and / or the conveying channel of the first cooled flue gas and / or the conveying channel of the first dust-removed flue gas; the SCR denitration reducing agent supply unit includes a diversion device and an evaporation device, the diversion device includes a diversion channel and a draft fan arranged on the diversion channel, the inlet of the diversion channel is connected to the conveying channel of the first dust-removed flue gas and / or the conveying channel of the denitrated flue gas, the outlet of the diversion channel is connected to the evaporation device, and the evaporation device uses the flue gas output by the diversion device to heat the liquid SCR denitration reducing agent to convert the liquid SCR denitration reducing agent into a gaseous SCR denitration reducing agent and convey it to the conveying channel of the industrial furnace flue gas and / or the conveying channel of the first cooled flue gas and / or the conveying channel of the first dust-removed flue gas.

[0017] The above dust removal and denitration device and the smelting flue gas purification and waste heat utilization system for industrial silicon cleverly utilize the heat of the flue gas itself to evaporate the liquid SCR reducing agent, reducing the additional energy consumption.

[0018] A fourth object of the present disclosure is to provide a flue gas desulfurization device and an industrial furnace flue gas purification and waste heat utilization system to solve the technical problem that the desulfurization device in the industrial silicon smelting flue gas treatment system in the background art significantly increases the floor area of the industrial silicon smelting flue gas treatment system.

[0019] In this regard, in a fifth aspect, a flue gas desulfurization device is provided, including: a flue gas input structure for receiving the flue gas to be desulfurized; a flue gas output structure for outputting the desulfurized flue gas; a loop-shaped desulfurization flue connected between the flue gas input structure and the flue gas output structure, with both ends of the loop-shaped desulfurization flue respectively connected to the flue gas input structure and the flue gas output structure; a desulfurizing agent input structure for adding a desulfurizing agent to the flue gas to be desulfurized and / or the flue gas in the loop-shaped desulfurization flue; during operation, the equipment on the supply side of the flue gas to be desulfurized corresponding to the flue gas input structure and the equipment on the receiving side of the desulfurized flue gas corresponding to the flue gas output structure are distributed on both sides of the plane formed by the center line of the loop-shaped desulfurization flue.

[0020] In a sixth aspect, an industrial furnace flue gas purification and waste heat utilization system includes: a first waste heat boiler unit for obtaining the industrial furnace flue gas and performing first waste heat recovery and then outputting the first cooled flue gas; a first flue gas filter and dust collector unit for obtaining the first cooled flue gas and physically intercepting the dust in the first cooled flue gas through a filter element and then outputting the first dedusted flue gas; an SCR denitration reactor unit for obtaining the first dedusted flue gas added with an SCR denitration reducing agent and outputting the denitrated flue gas through an SCR denitration catalyst; a second waste heat boiler unit for obtaining the denitrated flue gas and performing second waste heat recovery and then outputting the second cooled flue gas; a flue gas desulfurization unit for obtaining the second cooled flue gas added with a desulfurizing agent and performing desulfurization and then outputting the desulfurized flue gas; the flue gas desulfurization unit adopts the flue gas desulfurization device in the above fifth aspect, and the flue gas input structure is used to receive the second cooled flue gas.

[0021] The above flue gas desulfurization device and the industrial furnace flue gas purification and waste heat utilization system adopt a meandering desulfurization flue, which can bring the following advantages: 1) High space utilization efficiency: The design of the meandering desulfurization flue allows for an increase in the flue gas flow path within a limited space, improving the space utilization rate; 2) Extended reaction time and improved desulfurization efficiency: The meandering desulfurization flue increases the residence time of the flue gas in the meandering desulfurization flue, providing more sufficient time for the desulfurization reaction. The longer reaction time and path may significantly improve the desulfurization efficiency; 3) Optimized layout: The equipment on the supply side of the flue gas to be desulfurized corresponding to the flue gas input structure and the equipment on the receiving side of the desulfurized flue gas corresponding to the flue gas output structure are distributed on both sides of the plane formed by the center line of the meandering desulfurization flue, achieving a compact and reasonable space layout, which helps to reduce the floor area of the industrial silicon smelting flue gas treatment system.

[0022] A fifth object of the present disclosure is to provide a flue gas waste heat recovery device and an industrial furnace flue gas purification and waste heat utilization system to solve the problem of the complex flue duct structure connected to the first waste heat boiler unit and the second waste heat boiler unit in the industrial silicon smelting flue gas treatment system in the background art.

[0023] In this regard, in a seventh aspect, a flue gas waste heat recovery device is provided, including: a first waste heat boiler unit, on the outer shell of the first waste heat boiler unit, a first flue gas to be cooled inlet and a first cooled flue gas outlet are respectively provided, and during use, the first flue gas to be cooled inlet and the first cooled flue gas outlet are respectively connected to the corresponding flue ducts through expansion joints; a second waste heat boiler unit, the second waste heat boiler unit is arranged on the left or right side of the first waste heat boiler unit, on the outer shell of the second waste heat boiler unit, a second flue gas to be cooled inlet and a second cooled flue gas outlet are respectively provided, and during use, the second flue gas to be cooled inlet and the second cooled flue gas outlet are respectively connected to the corresponding flue ducts through expansion joints; wherein, both the first cooled flue gas outlet and the second flue gas to be cooled inlet are arranged forward.

[0024] In an eighth aspect, an industrial furnace flue gas purification and waste heat utilization system is provided, including: a first waste heat boiler unit for obtaining the industrial furnace flue gas, performing first waste heat recovery, and then outputting a first cooled flue gas; a first flue gas filtration and dust removal unit for obtaining the first cooled flue gas, physically intercepting the dust in the first cooled flue gas through a filter element, and then outputting a first dedusted flue gas; an SCR denitration reactor unit for obtaining the first dedusted flue gas added with an SCR denitration reducing agent, and then outputting a denitrated flue gas through an SCR denitration catalyst; a second waste heat boiler unit for obtaining the denitrated flue gas, performing second waste heat recovery, and then outputting a second cooled flue gas; the first waste heat boiler unit and the second waste heat boiler unit form the flue gas waste heat recovery device in the above seventh aspect; wherein, the first flue gas to be cooled inlet is used to obtain the industrial furnace flue gas, and the second flue gas to be cooled inlet is used to obtain the denitrated flue gas.

[0025] For the above flue gas waste heat recovery device and the industrial furnace flue gas purification and waste heat utilization system, through the layout design optimization of the first waste heat boiler unit and the second waste heat boiler unit, it helps to improve the rationality of the spatial layout of the entire industrial furnace flue gas purification and waste heat utilization system.

[0026] The following further describes the present disclosure in conjunction with the accompanying drawings and specific embodiments. The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through practice. Description of the Drawings

[0027] The drawings forming a part of this specification are used to assist in understanding the present disclosure. The content provided in the drawings and the relevant explanations in this specification can be used to explain the present disclosure, but do not constitute an improper limitation to the present disclosure.

[0028] Figure 1 It is a three-dimensional model diagram of the industrial furnace flue gas purification and waste heat utilization system according to the embodiment of the present disclosure.

[0029] Figure 2 is Figure 1 a partial enlarged view of.

[0030] Figure 3 is Figure 1 a partial enlarged view of.

[0031] Figure 4 is Figure 1 a partial enlarged view of.

[0032] Figure 5 is Figure 1 the plan layout diagram of the industrial furnace flue gas purification and waste heat utilization system shown in.

[0033] Figure 6 This is a schematic structural diagram of an improved integrated dust removal and denitrification device of the present disclosure. Specific embodiments

[0034] The following clearly and completely describes the present disclosure with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure with reference to the accompanying drawings, it should be particularly noted that:

[0035] The technical solutions and technical features provided in each part including the following description can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be given specific technical subjects and be protected by relevant patents.

[0036] The embodiments of the present disclosure involved in the following description are usually only a part of the embodiments rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative work based on these embodiments should fall within the scope of patent protection.

[0037] Regarding the terms and units in this specification: The terms "including", "comprising", "having" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusion. The terms "front", "rear", "left", "right" in this specification and the corresponding claims and related parts represent relative positional relationships based on the accompanying drawings. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0038] Figure 1 This is a three-dimensional model diagram of the industrial furnace flue gas purification and waste heat utilization system of the embodiment of the present disclosure. Figure 5 It is Figure 1 The floor plan of the industrial furnace flue gas purification and waste heat utilization system shown. As Figure 1 、 Figure 5 shown, an industrial furnace flue gas purification and waste heat utilization system mainly includes: a first waste heat boiler unit 11, a first flue gas filter and dust collector unit 13, an SCR denitrification reactor unit 14 and a second waste heat boiler unit 15.

[0039] The first waste heat boiler unit 11 is used to obtain the industrial furnace flue gas (specifically, the flue gas from the smelting of industrial silicon here, and the flue gas from the smelting of industrial silicon comes from the submerged arc furnace for smelting industrial silicon) and perform the first waste heat recovery and then output the first cooled flue gas.

[0040] The first flue gas filtration and dust removal unit 13 is used to obtain the first cooled flue gas and output the first dedusted flue gas after physically intercepting the dust in the first cooled flue gas through a filter element.

[0041] The SCR denitration reactor unit 14 is used to obtain the first dedusted flue gas added with an SCR denitration reducing agent and output the denitrated flue gas after passing through an SCR denitration catalyst.

[0042] The second waste heat boiler unit 15 is used to obtain the denitrated flue gas and perform secondary waste heat recovery and then output the second cooled flue gas.

[0043] The flue gas desulfurization unit 16 is used to obtain the second cooled flue gas added with a desulfurizing agent and perform desulfurization and then output the desulfurized flue gas.

[0044] Wherein, the first waste heat boiler unit 11 and the second waste heat boiler unit 15 are both arranged in the first ground area A, the first flue gas filtration and dust removal unit 13 and the SCR denitration reactor unit 14 are both arranged in the second ground area B, the flue gas desulfurization unit 16 and the subsequent flue gas treatment equipment of the flue gas desulfurization unit 16 are arranged in the third ground area C, the first ground area A and the second ground area B are arranged opposite to each other, and the third ground area C is located between the first ground area A and the second ground area C.

[0045] The working principle of the above industrial furnace flue gas purification and waste heat utilization system is as follows: The high-temperature flue gas generated by the industrial silicon smelting submerged arc furnace enters the first waste heat boiler unit 11 for preliminary heat recovery, and the first waste heat boiler unit 11 outputs the first cooled flue gas with a reduced temperature; The first cooled flue gas enters the first flue gas filtration and dust removal unit 13, and the dust particles (mainly micro-silica powder) in the flue gas are physically intercepted through a filter element to output the first dedusted flue gas; The first dedusted flue gas is denitrated by the SCR denitration reactor unit 14 and then the denitrated flue gas is output; The denitrated flue gas enters the second waste heat boiler unit 15 for secondary heat recovery to further reduce the flue gas temperature and output the second cooled flue gas; The second cooled flue gas is desulfurized by the flue gas desulfurization unit 16 and then the desulfurized flue gas is output.

[0046] Since the flue gas desulfurization unit 16 is arranged at the output end of the second cooled flue gas of the second waste heat boiler unit 15, in this way, the first flue gas filtration and dust removal unit 13 can recover micro-silica powder with higher purity.

[0047] The above industrial furnace flue gas purification and waste heat utilization system, through the reasonable spatial layout of the first waste heat boiler unit 11, the first flue gas filtration and dust removal unit 13, the SCR denitration reactor unit 14, the second waste heat boiler unit 15, the flue gas desulfurization unit 16, and the subsequent flue gas treatment equipment of the flue gas desulfurization unit 16, makes the space occupation of the industrial furnace flue gas purification and waste heat utilization system compact, which helps to shorten the occupied length of the industrial silicon smelting flue gas treatment system and save the project land occupation.

[0048] In this embodiment, the flue gas desulfurization unit 16 selects the dry desulfurization technology. That is, the flue gas desulfurization unit 16 is used to obtain the second cooled flue gas added with a desulfurizing agent and remove sulfur in the gas phase in the form of a solid phase or carrier by the desulfurizing agent from the gas phase to obtain the desulfurized flue gas.

[0049] At this time, the industrial furnace flue gas purification and waste heat utilization system further includes a second flue gas filtration and dust removal unit 17, which is used to obtain the desulfurized flue gas and physically intercept the dust in the desulfurized flue gas through a filter element and then output the second dedusted flue gas.

[0050] Among them, both the flue gas desulfurization unit 16 and the second flue gas filtration and dust removal unit 17 are arranged in the third ground area C.

[0051] Specifically, the flue gas desulfurization unit 16 is arranged between the second waste heat boiler unit 15 and the second flue gas filtration and dust removal unit 17; the second flue gas filtration and dust removal unit 17 is arranged between the first flue gas filtration and dust removal unit 13 and the flue gas desulfurization unit 16.

[0052] In addition, the second dedusted flue gas exhaust port of the second flue gas filtration and dust removal unit 17 is connected to the chimney 19 through a fan 18. As Figure 5 can be seen, the fan 18 and the chimney 19 are also located in the third ground area C.

[0053] As Figure 1 、 Figure 5As shown, in a specific embodiment, the first waste heat boiler unit 11 and the second waste heat boiler unit 15 are connected together such that the first waste heat boiler unit 11 and the second waste heat boiler unit 15 form an integrated heat exchange device 1A. The integrated heat exchange device 1A has a first cooled flue gas exhaust port, a denitrified flue gas inlet, and a second cooled flue gas exhaust port in a first direction; the SCR denitrification reactor unit 14 is assembled on the first flue gas filter and dust collector unit 13 to form an integrated dust removal and denitrification device 1B. The integrated dust removal and denitrification device 1B has a first cooled flue gas inlet and a denitrified flue gas exhaust port in a second direction; the integrated heat exchange device 1A and the integrated dust removal and denitrification device 1B are disposed opposite to each other, and the third ground area C is located between the integrated heat exchange device 1A and the integrated dust removal and denitrification device 1B; the first direction and the second direction are opposite directions. A first cooled flue gas supply channel 101 is connected between the first cooled flue gas exhaust port and the first cooled flue gas inlet, a denitrified flue gas return channel 102 is connected between the denitrified flue gas inlet and the denitrified flue gas exhaust port, and a second cooled flue gas supply channel is connected between the second cooled flue gas exhaust port and the flue gas desulfurization unit 16.

[0054] Since, on the basis of adopting the integrated dust removal and denitrification device 1B and the integrated heat exchange device 1A, the first cooled flue gas exhaust port, the denitrified flue gas inlet, and the second cooled flue gas exhaust port of the integrated heat exchange device 1A are designed in the first direction (specifically forward here), and the first cooled flue gas inlet and the denitrified flue gas exhaust port of the integrated dust removal and denitrification device 1B are designed in the second direction (specifically backward here), and the first direction and the second direction are opposite directions, in this way, the first cooled flue gas supply channel 101 and the denitrified flue gas return channel 102 do not need to be bent by 180°, which can reduce the construction cost and the air flow pressure loss of these flue ducts.

[0055] In addition, a mechanical dust collector 12 is connected in series on the first cooled flue gas supply channel 101. The mechanical dust collector 12 is arranged in the third ground area C and is located beside the flue gas desulfurization unit 16 and the second flue gas filter and dust collector unit 17. The mechanical dust collector 12 generally adopts a cyclone dust collector.

[0056] Figure 2 For Figure 1 partial enlarged view of. Figure 4 For Figure 1 partial enlarged view of. Combining Figure 2 、 Figure 4 As shown, the integrated dust removal and denitrification device 1B includes:

[0057] A) The first box body 21, inside which there are the following compartments formed by separating through the first box body internal partition system;

[0058] A1) The left dust collector general compartment, which has more than one left dust collector compartment arranged in sequence along the front - rear direction. Each left dust collector compartment has a left dust collector lower raw gas compartment and a left dust collector upper clean gas compartment. Between the left dust collector lower raw gas compartment and the left dust collector upper clean gas compartment, there is a filter element mounting plate, and filter elements extending downward into the left dust collector lower raw gas compartment are installed on the filter element mounting plate;

[0059] A2) The right dust collector general compartment, which has more than one right dust collector compartment arranged in sequence along the front - rear direction. Each right dust collector compartment has a right dust collector lower raw gas compartment and a right dust collector upper clean gas compartment. Between the right dust collector lower raw gas compartment and the right dust collector upper clean gas compartment, there is a filter element mounting plate, and filter elements extending downward into the left dust collector lower raw gas compartment are installed on the filter element mounting plate;

[0060] A3) The middle flue general compartment, which is located between the left dust collector general compartment and the right dust collector general compartment and has a lower intake flue compartment 23 and an upper exhaust flue compartment 24. The lower intake flue compartment 23 extends along the front - rear direction and is respectively communicated with each left dust collector lower raw gas compartment and each right dust collector lower raw gas compartment, and the upper exhaust flue compartment 24 extends along the front - rear direction;

[0061] B) The second box body 22, which is arranged on the top of the first box body 21, and a passage is reserved around the second box body 22 on the top surface of the first box body 21. Inside the second box body 22, there are the following compartments formed by separating through the second box body internal partition system:

[0062] B1) The left gas collection compartment, the lower part of which is arranged above the left dust collector general compartment and is communicated with each left dust collector upper clean gas compartment. An upper exhaust opening of the left gas collection compartment is opened on the upper right partition board of the left gas collection compartment;

[0063] B2) The right gas collection compartment, the lower part of which is arranged above the right dust collector general compartment and is communicated with each right dust collector upper clean gas compartment. An upper exhaust opening of the right gas collection compartment is opened on the upper left partition board of the right gas collection compartment;

[0064] B3) Intermediate SCR denitration reaction chamber, which is located between the left gas collection chamber and the right gas collection chamber. The upper part of the intermediate SCR denitration reaction chamber is respectively communicated with the upper exhaust ports of the left gas collection chamber and the right gas collection chamber. The lower part of the intermediate SCR denitration reaction chamber is arranged above the intermediate flue gas main chamber and is communicated with the upper exhaust flue gas chamber 24. An SCR denitration catalyst bed layer is arranged in the intermediate SCR denitration reaction chamber;

[0065] Among them, the total intake port of the lower intake flue gas chamber 23 and the total exhaust port of the upper exhaust flue gas chamber 24 are arranged on the same side in the front-rear direction of the first box body 21 and face the second direction (specifically, set backward).

[0066] Among them, the filter element can be a metal filter bag, a ceramic tubular filter element or a metal tubular filter element. When the flue gas temperature entering the dust removal and denitration integrated equipment is relatively low, the filter element can also be a cloth bag.

[0067] The above-mentioned dust removal and denitration integrated equipment 1B has the external feature of a combination of a large box body (the first box body 21) and a small box body (the second box body 22) with the small box body located at the top of the large box body. Among them, the internal structure of the large box body is relatively common, and the internal structure of the small box body and the connection relationship between the small box body and the large box body are the key innovation points of this dust removal and denitration integrated equipment. The small box body uses the left gas collection chamber and the right gas collection chamber to introduce the air flow in the upper clean gas chambers of each left dust collector and each right dust collector from bottom to top into the small box body, and then from top to bottom through the intermediate SCR denitration reaction chamber. The air flow discharged from the intermediate SCR denitration reaction chamber continues to flow downward into the upper exhaust flue gas chamber 24, and thus is discharged from the dust removal and denitration integrated equipment 1B through the upper exhaust flue gas chamber 24. The above-mentioned dust removal and denitration integrated equipment 1B directly uses the upper exhaust flue gas chamber 24 in the large box body to achieve exhaust, and realizes the dust removal and denitration integrated scheme with a simple improvement on the basis of the existing dust collector structure. The advantages of the above-mentioned dust removal and denitration integrated equipment 1B are not only simple in structure and can save construction costs, but also have the advantages of convenient loading and unloading of the SCR denitration catalyst and saving floor area.

[0068] In a preferred implementation manner, the second box body 22 is located at the center of the top of the first box body 21, and a passage is reserved around the second box body 22 on the top surface of the first box body 21. In a general implementation manner, both the first box body 21 and the second box body 22 are rectangular box bodies.

[0069] In a preferred embodiment, the top plate of the lower intake flue gas chamber and the bottom plate of the upper exhaust flue gas chamber form a conical structure, such that the cross-sectional area of the lower intake flue gas chamber gradually decreases in the intake direction in the front-rear direction and the cross-sectional area of the upper exhaust flue gas chamber gradually increases in the exhaust direction in the front-rear direction.

[0070] In a general embodiment, ash hoppers 25 are provided at the bottoms of the raw gas chambers below each left dust collector and at the bottoms of the raw gas chambers below each right dust collector, and a dust discharging device is provided at the bottom of each ash hopper 25.

[0071] In an alternative embodiment, the lower intake flue gas chamber 23 is respectively connected to the sides of the ash hoppers 25 through independent intake manifolds, and intake valves are installed on each intake manifold.

[0072] In a preferred embodiment, at least two layers of SCR denitration catalyst beds arranged vertically are provided in the middle SCR denitration reaction chamber.

[0073] As a further improvement to the above dust removal and denitration integrated device 1B, the SCR denitration reducing agent supply unit (the SCR denitration reducing agent supply unit is used to supply the SCR denitration reducing agent) corresponding to the SCR denitration reactor unit 14 includes a diversion device 25 and an evaporation device 26. The diversion device 25 includes a diversion channel 251 and a draft fan 252 provided on the diversion channel 251. The inlet of the diversion channel 251 is connected to the conveying channel of the denitrated flue gas, the outlet of the diversion channel 251 is connected to the evaporation device 26, and the evaporation device 26 uses the flue gas output by the diversion device 25 to heat the liquid SCR denitration reducing agent to convert the liquid SCR denitration reducing agent into a gaseous SCR denitration reducing agent and convey it to the conveying channel of the first dust-removed flue gas.

[0074] Wherein, the liquid SCR denitration reducing agent is specifically ammonia water, and the gaseous SCR denitration reducing agent is specifically ammonia gas.

[0075] The above improvement makes clever use of the heat of the denitrated flue gas itself to evaporate the liquid SCR reducing agent, reducing the additional energy consumption.

[0076] Specifically, the draft fan 252 is provided on the first box body 21, the diversion channel 251 is composed of a diversion pipe, and the diversion pipe 251 is externally connected between the draft fan 252 and the total exhaust port of the upper exhaust flue gas chamber 24. More specifically, the inlet of the diversion pipe 251 is connected to the denitrated flue gas return channel 102.

[0077] In a preferred embodiment, the first waste heat boiler unit 11 uses a waste heat boiler that outputs a first cooled flue gas temperature of 260°C - 360°C, and the second waste heat boiler unit 15 uses a waste heat boiler that outputs a second cooled flue gas temperature of 140°C - 160°C.

[0078] Thus, the first cooled flue gas temperature output by the first waste heat boiler unit 11 is 260°C - 360°C (optionally, the first waste heat boiler unit 11 uses a waste heat boiler that outputs a first cooled flue gas temperature of ≥260°C and less than 300°C or uses a waste heat boiler that outputs a first cooled flue gas temperature of greater than 300°C and ≤360°C), and the second cooled flue gas temperature used by the second waste heat boiler unit 15 is 140°C - 160°C. The temperature of the 260°C - 360°C first cooled flue gas output by the first waste heat boiler unit 11 is very suitable for medium-high temperature SCR denitrification reaction. In this temperature range, the activity of the medium-high temperature SCR denitrification catalyst is the best. The temperature of the 140°C - 160°C second cooled flue gas output by the second waste heat boiler unit 15 is both higher than the dew point temperatures of water and acid in the second cooled flue gas, which can prevent condensation and the subsequent corrosion problems in the flue gas system. Moreover, the temperature of the second cooled flue gas can ensure the maximization of energy efficiency under the condition of effectively avoiding acid condensation.

[0079] In addition, the inlet and outlet temperature difference of the second waste heat boiler unit 15 is relatively small (if considering a 20°C drop in temperature from the first cooled flue gas to the denitrified flue gas, then the inlet and outlet temperature difference of the second waste heat boiler unit drops from 240°C - 340°C to 140°C - 160°C). Therefore, it allows the second waste heat boiler unit 15 to adopt a more compact design, reduce thermal stress, and extend the equipment life; the second waste heat boiler unit 15 can also use more economical materials, such as carbon steel, to significantly reduce the manufacturing cost; the lower operating temperature and simplified structure of the second waste heat boiler unit 15 make the maintenance and cleaning of the second waste heat boiler unit 15 easier, greatly reducing the downtime and maintenance cost of the second waste heat boiler unit 15; due to the relatively small inlet and outlet temperature difference of the second waste heat boiler unit 15, the heat transfer surface design can be optimized, such as using denser fins, to improve the heat transfer efficiency per unit area.

[0080] Figure 6 This is a structural schematic diagram of an improved dust removal and denitrification integrated device of the present disclosure. As Figure 6 shown, the above dust removal and denitrification integrated device 1B can be adjusted to: The dust removal and denitrification integrated device includes:

[0081] A) A first box body 21, and the interior of the first box body 21 has the following compartments formed by being separated by a first box body internal partition system:

[0082] A1) The total left dust collector cabin, the total left dust collector cabin having more than one left dust collector compartments arranged in sequence in the front-rear direction, each left dust collector compartment having a lower raw gas cabin of the left dust collector and an upper clean gas cabin of the left dust collector, a filter element mounting plate being provided between the lower raw gas cabin of the left dust collector and the upper clean gas cabin of the left dust collector, and a filter element being mounted on the filter element mounting plate and extending downward into the lower raw gas cabin of the left dust collector;

[0083] A2) The total right dust collector cabin, the total right dust collector cabin having more than one right dust collector compartments arranged in sequence in the front-rear direction, each right dust collector compartment having a lower raw gas cabin of the right dust collector and an upper clean gas cabin of the right dust collector, a filter element mounting plate being provided between the lower raw gas cabin of the right dust collector and the upper clean gas cabin of the right dust collector, and a filter element being mounted on the filter element mounting plate and extending downward into the lower raw gas cabin of the left dust collector;

[0084] A3) The total intermediate flue cabin, the total intermediate flue cabin being located between the total left dust collector cabin and the total right dust collector cabin and having a lower intake flue cabin 27 and an upper clean gas conveying cabin 28, the lower intake flue cabin 27 extending in the front-rear direction and being respectively communicated with each lower raw gas cabin of the left dust collector and each lower raw gas cabin of the right dust collector, and the upper clean gas conveying cabin 28 being located above the lower intake flue cabin 27, extending in the front-rear direction and being respectively communicated with each upper clean gas cabin of the left dust collector and each upper clean gas cabin of the right dust collector;

[0085] B) The second box body 22, the second box body 22 being arranged at the rear of the first box body 21, the interior of the second box body 22 having the following compartments formed by being separated by a second box body internal partition system:

[0086] B1) The front side gas collection cabin 29, the lower part of the front side gas collection cabin being arranged at the rear of the upper clean gas conveying cabin and being communicated with the upper clean gas conveying cabin, and the upper part of the front side gas collection cabin being provided with a front side gas collection cabin upper exhaust port;

[0087] B2) The rear side SCR denitration reaction cabin 210, the rear side SCR denitration reaction cabin being arranged at the rear of the front side gas collection cabin, the upper part of the rear side SCR denitration reaction cabin being communicated with the front side gas collection cabin upper exhaust port, the lower part of the rear side SCR denitration reaction cabin being provided with a rear side SCR denitration reaction cabin lower exhaust port, and an SCR denitration catalyst bed 211 being arranged in the rear side SCR denitration reaction cabin.

[0088] Figure 6The shown integrated dust removal and denitration equipment has the external shape feature of a combination of a large box body (the first box body 21) and a small box body (the second box body 22), and the small box body is located at the rear of the large box body. Among them, the connection relationship between the clean gas conveying cabin at the upper part of the large box body and the small box body is the key innovation point of this integrated dust removal and denitration equipment. Since the small box body is located at the rear of the large box body, the large box body does not need to bear the weight of the small box body. The large box body guides the air flow into the small box body through the upper clean gas conveying cabin 28, simply realizing the connection between the large box body and the small box body. The above integrated dust removal and denitration equipment has the advantages of simple structure and can save construction costs.

[0089] As required, the middle flue gas main cabin also has a middle exhaust flue gas cabin 212 located between the lower inlet flue gas cabin 27 and the upper clean gas conveying cabin 28, and the middle exhaust flue gas cabin 212 extends in the front-rear direction; the lower exhaust port of the rear SCR denitration reaction cabin is communicated with the rear end of the middle exhaust flue gas cabin 212; the total inlet of the lower inlet flue gas cabin 27 and the total exhaust of the middle exhaust flue gas cabin 212 are arranged on the same side (specifically the rear side here) of the first box body.

[0090] As a further improvement to the above integrated dust removal and denitration equipment 1B, the SCR denitration reductant supply unit corresponding to the SCR denitration reactor unit 14 (the SCR denitration reductant supply unit is used to supply SCR denitration reductant) includes a diversion device 25 and an evaporation device 26. The diversion device 25 includes a diversion channel 251 and a fan 252 arranged on the diversion channel 251. The inlet of the diversion channel 251 is connected to the conveying channel of the denitrated flue gas, and the outlet of the diversion channel 251 is connected to the evaporation device 26. The evaporation device 26 uses the flue gas output by the diversion device 25 to heat the liquid SCR denitration reductant to turn the liquid SCR denitration reductant into a gaseous SCR denitration reductant and convey it to the conveying channel of the first dust-removed flue gas.

[0091] Specifically, the fan 252 is arranged on the first box body 21, the diversion channel 251 is composed of a diversion pipe, and the diversion pipe 251 is externally connected between the fan 252 and the total exhaust port of the middle exhaust flue gas cabin 212. More specifically, the inlet of the diversion pipe 251 is connected to the denitrated flue gas return channel 102.

[0092] Figure 3 For Figure 1 Partial enlarged view of. Combined with Figure 3As shown, the flue gas desulfurization unit 16 includes: a flue gas input structure 161, a flue gas output structure 162, a loop-shaped desulfurization flue 163, and a desulfurizing agent input structure. Among them, the flue gas input structure 161 is used to receive the flue gas to be desulfurized, specifically a first flue gas conveying pipeline direction-changing joint here; the flue gas output structure 163 is used to output the desulfurized flue gas, specifically a second flue gas conveying pipeline direction-changing joint here; the loop-shaped desulfurization flue 163 is connected between the flue gas input structure 161 and the flue gas output structure 162, and both ends of the loop-shaped desulfurization flue 163 are respectively connected to the flue gas input structure 161 and the flue gas output structure 162; the desulfurizing agent input structure is used to add desulfurizing agent to the flue gas to be desulfurized and / or the flue gas in the loop-shaped desulfurization flue 163; during operation, the equipment on the supply side of the flue gas to be desulfurized corresponding to the flue gas input structure 161 (i.e., the second waste heat boiler unit 15) and the equipment on the receiving side of the desulfurized flue gas corresponding to the flue gas output structure 163 (i.e., the second flue gas filter and dust collector unit 17) are distributed on both sides of the plane formed by the center line of the loop-shaped desulfurization flue 163.

[0093] The above-mentioned flue gas desulfurization unit 16 adopts a loop-shaped desulfurization flue 163, which can bring the following advantages: 1) High space utilization efficiency: The design of the loop-shaped desulfurization flue 163 allows increasing the flue gas flow path in a limited space, improving the space utilization rate; 2) Prolonging the reaction time and improving the desulfurization efficiency: The loop-shaped desulfurization flue 163 increases the residence time of the flue gas in the loop-shaped desulfurization flue 163, providing more sufficient time for the desulfurization reaction. A longer reaction time and path may significantly improve the desulfurization efficiency; 3) Optimized layout: The equipment on the supply side of the flue gas to be desulfurized corresponding to the flue gas input structure 161 and the equipment on the receiving side of the desulfurized flue gas corresponding to the flue gas output structure 162 are distributed on both sides of the plane formed by the center line of the loop-shaped desulfurization flue 163, achieving a compact and reasonable space layout, which helps to reduce the floor area of the system.

[0094] Among them, the input direction of the flue gas to be desulfurized of the flue gas input structure 161 and / or the output direction of the desulfurized flue gas of the flue gas output structure 162 are usually perpendicular to the plane formed by the center line of the loop-shaped desulfurization flue 163.

[0095] The flue gas input structure 161 and the flue gas output structure 162 can be arranged with an up-and-down offset and / or a left-and-right offset.

[0096] Such as Figure 3As shown, the denitrified flue gas reflux channel 102 is located above the second flue gas filtration and dust removal unit 17 and the second cooled flue gas supply channel and passes through the annular area surrounded by the loop-shaped desulfurization flue 163. A switchable denitrified flue gas reflux manifold 164 is connected between the denitrified flue gas reflux channel 163 and the flue gas output structure 162 or the flue gas input structure 161 (the denitrified flue gas reflux manifold 164 can be controlled to be opened and closed by a slide valve). When the denitrified flue gas reflux manifold 164 is opened, the denitrified flue gas can flow through the denitrified flue gas reflux manifold 164 to the flue gas output structure 162 or the flue gas input structure 161.

[0097] The above structure is compact and can further save space. The denitrified flue gas reflux manifold 164 can introduce the denitrified flue gas into the flue gas output structure 162 or the flue gas input structure 161 during the maintenance of the second waste heat boiler unit 15. The denitrified flue gas introduced into the flue gas output structure 162 can flow from the flue gas output structure 162 to the second flue gas filtration and dust removal unit 17, while the denitrified flue gas introduced into the flue gas input structure 161 can flow from the flue gas output structure 162 to the second flue gas filtration and dust removal unit 17 after being desulfurized in the loop-shaped desulfurization flue 163.

[0098] As Figure 3 shown, in the above integrated heat exchange device 1A, a first inlet for the flue gas to be cooled and a first outlet for the cooled flue gas (i.e., the first cooled flue gas exhaust port) are respectively provided on the outer shell of the first waste heat boiler unit 11. During use, the first inlet for the flue gas to be cooled and the first outlet for the cooled flue gas are respectively connected to the corresponding flue through expansion joints. The second waste heat boiler unit 15 is arranged on the left or right side of the first waste heat boiler unit 11. A second inlet for the flue gas to be cooled (i.e., the denitrified flue gas inlet) and a second outlet for the cooled flue gas (i.e., the second cooled flue gas exhaust port) are respectively provided on the outer shell of the second waste heat boiler unit 15. During use, the second inlet for the flue gas to be cooled and the second outlet for the cooled flue gas are respectively connected to the corresponding flue through expansion joints. Among them, the first outlet for the cooled flue gas, the second inlet for the flue gas to be cooled, and the second outlet for the cooled flue gas are all arranged facing forward, and the second inlet for the flue gas to be cooled and the second outlet for the cooled flue gas are arranged at intervals up and down.

[0099] The second waste heat boiler unit 15 can be expanded on the left or right side of the first waste heat boiler unit 11.

[0100] The above has described the relevant content of the present disclosure. Those of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Based on the above content of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of patent protection.

Claims

1. A flue gas desulfurization device, characterized in that: include: A flue gas input structure, wherein the flue gas input structure is used to receive the flue gas to be desulfurized; A flue gas output structure, wherein the flue gas output structure is used to output the desulfurized flue gas; A meander-shaped desulfurization flue, wherein the meander-shaped desulfurization flue is connected between the flue gas input structure and the flue gas output structure, and the two ends of the meander-shaped desulfurization flue are respectively connected to the flue gas input structure and the flue gas output structure; A desulfurizing agent input structure, wherein the desulfurizing agent input structure is used to add desulfurizing agent to the flue gas to be desulfurized and / or the flue gas in the meandering desulfurization flue; During operation, the equipment on the supply side of the flue gas to be desulfurized corresponding to the flue gas input structure and the equipment on the receiving side of the desulfurized flue gas corresponding to the flue gas output structure are distributed on both sides of the plane formed by the center line of the meandering desulfurization flue.

2. A flue gas desulfurization device according to claim 1, characterized in that: It is used for obtaining the flue gas to be desulfurized to which the desulfurizer is added and removing the sulfur in the gas phase from the gas phase in the form of a solid phase or a carrier through the desulfurizer to obtain the desulfurized flue gas.

3. A flue gas desulfurization device according to claim 1 or 2, characterized in that: The smoke input structure and / or the smoke output structure adopts a smoke conveying pipeline changing joint.

4. A flue gas desulfurization device according to claim 1 or 2, characterized in that: The input direction of the flue gas to be desulfurized of the flue gas input structure and / or the output direction of the desulfurized flue gas of the flue gas output structure are perpendicular to the plane formed by the center line of the meandering desulfurization flue; And / or, the smoke input structure and the smoke output structure are staggered up and down and / or left and right.

5. An industrial kiln fume purification and waste heat utilization system, comprising: A first waste heat boiler unit is used to obtain the industrial kiln flue gas and perform first waste heat recovery to output first cooled flue gas; a first flue gas filtering and dust removal unit, for obtaining the first cooled flue gas, physically intercepting dust in the first cooled flue gas through a filter element, and then outputting first dust-removed flue gas; An SCR denitration reactor unit is used to obtain the first dust-removed flue gas to which an SCR denitration reducing agent is added and then output the denitration flue gas after passing through an SCR denitration catalyst; A second waste heat boiler unit is used to obtain the denitrified flue gas and perform a second waste heat recovery to output a second cooled flue gas; A flue gas desulfurization unit, used for obtaining the second cooled flue gas to which a desulfurizer is added, performing desulfurization on the second cooled flue gas, and then outputting desulfurized flue gas; Features: The flue gas desulfurization unit adopts a flue gas desulfurization device as claimed in any one of claims 1 to 4, and the flue gas input structure is used to receive the second cooled flue gas.

6. The industrial furnace fume purification and waste heat utilization system according to claim 5, characterized in that: The first waste heat boiler unit and the second waste heat boiler unit are both arranged in the first ground area, the first flue gas filter dust collector unit and the SCR denitrification reactor unit are both arranged in the second ground area, the flue gas desulfurization unit and the subsequent flue gas treatment equipment of the flue gas desulfurization unit are arranged in the third ground area, the first ground area and the second ground area are arranged opposite to each other, the third ground area is located between the first ground area and the second ground area, and the flue gas supply side equipment to be desulfurized is the second waste heat boiler unit.

7. The industrial furnace fume purification and waste heat utilization system according to claim 6, characterized in that: It also includes a second flue gas filter dust collector unit, which is used to obtain the desulfurized flue gas, physically intercept the dust in the desulfurized flue gas through a filter element, and then output a second dust-removed flue gas, and the second dust-removed flue gas exhaust port of the second flue gas filter dust collector unit is connected to the chimney through a fan; The flue gas desulfurization unit and the second flue gas filter dust collector unit are both arranged in the third ground area, the flue gas desulfurization unit is arranged between the second waste heat boiler unit and the second flue gas filter dust collector unit, the second flue gas filter dust collector unit is arranged between the first flue gas filter dust collector unit and the flue gas desulfurization unit, and the desulfurized flue gas receiving side equipment is the second flue gas filter dust collector unit.

8. The industrial furnace fume purification and waste heat utilization system according to claim 7, characterized in that: The first waste heat boiler unit and the second waste heat boiler unit are connected together so that the first waste heat boiler unit and the second waste heat boiler unit constitute an integrated heat exchange device, and the integrated heat exchange device has a first cooled flue gas exhaust port, a denitrified flue gas inlet port and a second cooled flue gas exhaust port located in a first direction; The SCR denitration reactor unit is assembled on the first flue gas filter dust collector unit to form a dust removal and denitration integrated device, and the dust removal and denitration integrated device has a first cooled flue gas inlet and a denitration flue gas exhaust port located in the second direction; The integrated heat exchange device is arranged opposite to the integrated dust removal and denitration device, and the third ground area is located between the integrated heat exchange device and the integrated dust removal and denitration device; The first direction and the second direction are relative directions, the first cooled flue gas exhaust port and the first cooled flue gas inlet are connected to the first cooled flue gas air supply channel, the denitrified flue gas inlet and the denitrified flue gas exhaust port are connected to the denitrified flue gas reflux channel, and the second cooled flue gas exhaust port and the flue gas desulfurization unit are connected to the second cooled flue gas air supply channel.

9. The industrial furnace fume purification and waste heat utilization system according to claim 8, characterized in that: The denitrification flue gas reflow channel is located above the second flue gas filter dust collector unit and the second cooled flue gas air supply channel and passes through the annular area surrounded by the meandering desulfurization flue. An openable and closable denitrification flue gas reflow manifold is connected between the denitrification flue gas reflow channel and the flue gas output structure or the flue gas input structure. When the denitrification flue gas reflow manifold is opened, the denitrification flue gas can flow to the flue gas output structure or the flue gas input structure through the denitrification flue gas reflow manifold.

10. The industrial furnace fume purification and waste heat utilization system according to claim 5, characterized in that: The industrial furnace flue gas is the smelting flue gas of industrial silicon.

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