Flue gas purification and waste heat utilization system of industrial kiln

Abstract

The utility model discloses a flue gas purification and waste heat utilization system for an industrial kiln. The flue gas purification and waste heat utilization system comprises a first waste heat boiler unit, a first flue gas filtering dust remover unit, an SCR denitration reactor unit and a second waste heat boiler unit, the first waste heat boiler unit adopts a waste heat boiler which outputs first cooled flue gas at the temperature of 260-360 DEG C, and the second waste heat boiler unit adopts a waste heat boiler which outputs second cooled flue gas at the temperature of 140-160 DEG C. The temperature of the first cooled flue gas is very suitable for medium-high temperature SCR denitration reaction, and in the temperature range, the activity of a medium-high temperature SCR denitration catalyst is optimal. The temperature of the second cooled flue gas at the temperature of 140-160 DEG C is higher than the dew point temperature of water and acid in the second cooled flue gas, so that the problems of dew formation and consequent corrosion in the flue system can be prevented, and the temperature of the second cooled flue gas can ensure that the energy efficiency is maximized under the condition of effectively avoiding acid dew formation.

Description

Technical Field

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

[0002] The applicant provides an industrial silicon smelting flue gas treatment system in the patent document with publication number CN114887409A, which first adjusts the industrial silicon smelting furnace smelting flue gas with a temperature of 450℃-650℃ discharged from the industrial silicon smelting furnace to a first cooled flue gas with a temperature of 300℃-450℃ through a first waste heat boiler unit, and then adjusts the first cooled flue gas to dust-removed flue gas after filtering and dust-removing the first cooled flue gas through a flue gas filter dust collector unit, and then denitrates the dust-removed flue gas through an SCR denitration reactor unit to obtain denitrated flue gas, and then adjusts the denitrated flue gas to a second cooled flue gas with a temperature of 100℃-200℃ through a second waste heat boiler unit, and the second cooled flue gas finally enters a desulfurization device for desulfurization. In actual application, it is found that the industrial silicon smelting flue gas treatment system has the following technical problems.

[0003] First, the desulfurization device is set after the second waste heat boiler unit. When the desulfurization device selects dry desulfurization, since the tail gas after dry desulfurization will be mixed with a certain concentration of particulate matter (particulate matter includes residual desulfurizer and the reactant of desulfurizer and sulfur dioxide), it is necessary to set up dust removal equipment after the desulfurization device, which leads to a long process flow of the industrial silicon smelting flue gas treatment system, thereby increasing the 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, which significantly increases the floor space 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, the sulfur dioxide in the second cooled flue gas is likely to condense in the form of acid, causing serious corrosion of the pipeline. 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 is not fully utilized.

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

[0006] Fourth, although the applicant assembled the first waste heat recovery unit and the second waste heat recovery unit into an integrated heat exchange device based on the above-mentioned industrial silicon smelting flue gas treatment system, the flue structure connected to the integrated heat exchange device is complex, which increases the flue construction cost and also increases the airflow pressure loss. Utility Model Content

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

[0008] In this regard, in the first aspect, an industrial kiln flue gas purification and waste heat utilization system is provided, including: a first waste heat boiler unit, used to obtain the industrial kiln flue gas and perform a first waste heat recovery to output a first cooled flue gas; a first flue gas filtration and dust removal unit, used to obtain the first cooled flue gas and physically intercept the dust in the first cooled flue gas through a filter element to output a first dust-removed flue gas; an SCR denitration reactor unit, used to obtain the first dust-removed flue gas to which an SCR denitration reducing agent is added and output the denitrated flue gas after passing through an SCR denitration catalyst; a second waste heat boiler unit, used to obtain the denitrated flue gas and perform a first waste heat recovery to output a first dust-removed flue gas; The second cooled flue gas is output after the second waste heat is recovered; a flue gas desulfurization unit is used to obtain the second cooled flue gas added with a desulfurizer and output the desulfurized flue gas after desulfurization; 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, and the third ground area is located between the first ground area and the second ground area.

[0009] The above-mentioned industrial kiln flue gas purification and waste heat utilization system makes the space occupancy of the industrial kiln flue gas purification and waste heat utilization system compact through the reasonable spatial layout of the first waste heat boiler unit, the first flue gas filtration and dust removal unit, the SCR denitrification 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, which helps to shorten the floor space of the industrial silicon smelting flue gas treatment system and save project land.

[0010] The second purpose of the present disclosure is to provide an industrial furnace flue gas purification and waste heat utilization system to solve the problem of unreasonable 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.

[0011] In this regard, the second aspect provides an industrial kiln flue gas purification and waste heat utilization system, including: a first waste heat boiler unit, used to obtain the industrial kiln flue gas and output a first cooled flue gas after performing a first waste heat recovery; a first flue gas filter dust collector unit, used to obtain the first cooled flue gas and output a first dust-removed flue gas after physically intercepting the dust in the first cooled flue gas through a filter element; an SCR denitrification reactor unit, used to obtain the first dust-removed flue gas added with an SCR denitrification reductant and output the denitrified flue gas after passing through an SCR denitrification catalyst; a second waste heat boiler unit, used to obtain the denitrified flue gas and output a second cooled flue gas after performing a second waste heat recovery; the first waste heat boiler unit adopts a waste heat boiler that outputs the first cooled flue gas at a temperature of 260°C-360°C, and the second waste heat boiler unit adopts a waste heat boiler that outputs the second cooled flue gas at a temperature 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-mentioned industrial kiln flue gas purification and waste heat utilization system is 260℃-360℃ (optionally, the first waste heat boiler unit adopts a waste heat boiler that outputs the first cooled flue gas temperature of ≥260℃ and less than 300℃ or adopts a waste heat boiler that outputs the first cooled flue gas temperature of greater than 300℃ and ≤360℃), and the second cooled flue gas temperature adopted by the second waste heat boiler unit is 140℃-160℃. The temperature of the first cooled flue gas of 260℃-360℃ output by the first waste heat boiler unit is very suitable for medium and high temperature SCR denitration reaction. Within this temperature range, the activity of the medium and high temperature SCR denitration catalyst is optimal. The temperature of the second cooled flue gas of 140℃-160℃ output by the second waste heat boiler unit is higher than the dew point temperature of water and acid in the second cooled flue gas, which can prevent condensation in the flue system and the resulting corrosion problems, and the temperature of the second cooled flue gas can ensure the maximum energy efficiency under the condition of effectively avoiding acid condensation.

[0013] In addition, the inlet and outlet temperature difference of the second waste heat boiler unit is relatively small (if the temperature drops by 20°C from the first cooled flue gas to the denitrified flue gas, 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, the second waste heat boiler unit is allowed to adopt a more compact design, reduce thermal stress, and extend equipment life; the second waste heat boiler unit can also use more economical materials, such as carbon steel, significantly reducing manufacturing costs; the lower operating temperature and simplified structure of the second waste heat boiler unit make the second waste heat boiler unit easier to maintain and clean, greatly reducing the downtime and maintenance costs of the second waste heat boiler unit; since the inlet and outlet temperature difference of the second waste heat boiler unit is relatively small, the heat exchange surface design can be optimized, such as using denser fins to improve the heat exchange efficiency per unit area.

[0014] The third purpose of the present disclosure is to provide a dust removal and denitrification device and an industrial silicon smelting flue gas purification and waste heat utilization system to solve the problem of high energy consumption of the SCR denitrification reactor unit in the industrial silicon smelting flue gas treatment system in the background technology.

[0015] In this regard, in a third aspect, a dust removal and denitrification device is provided, comprising: a flue gas dust collector unit, for obtaining the flue gas to be dusted and outputting the dust-removed flue gas after dust removal; an SCR denitrification reactor unit, for obtaining the dust-removed flue gas to which an SCR denitrification reducing agent is added and outputting the denitrified flue gas after passing through an SCR denitrification catalyst; an SCR denitrification reducing agent supply unit, for adding the SCR denitrification reducing agent to the conveying channel of the flue gas to be dusted and / or the conveying channel of the dust-removed flue gas; the SCR denitrification reducing agent supply unit includes a drainage The invention relates to a device and an evaporation device, wherein the drainage device comprises a drainage channel and an induced draft fan arranged on the drainage channel, the inlet of the drainage channel is connected to the conveying channel of the dust-removed flue gas and / or the conveying channel of the denitrified flue gas, and the outlet of the drainage channel is connected to the evaporation device, and the evaporation device uses the flue gas output by the drainage device to heat the liquid SCR denitrification reducing agent so that the liquid SCR denitrification reducing agent is converted into a gaseous SCR denitrification reducing agent and is conveyed 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, an industrial silicon smelting flue gas purification and waste heat utilization system is provided, comprising: a first waste heat boiler unit, used to obtain the smelting flue gas and perform a first waste heat recovery to output a first cooled flue gas; a first flue gas filtering dust collector unit, used to obtain the first cooled flue gas and physically intercept the dust in the first cooled flue gas through a filter element to output a first dust-removed flue gas; an SCR denitration reactor unit, used to obtain the first dust-removed flue gas to which an SCR denitration reducing agent is added and output the denitration flue gas after passing through an SCR denitration catalyst; an SCR denitration reducing agent supply unit, used to supply the conveying channel of the industrial kiln flue gas and / or the conveying channel of the first cooled flue gas and / or the first dust-removed flue gas. The SCR denitrification reducing agent is added to the flue gas conveying channel; the SCR denitrification reducing agent supply unit includes a drainage device and an evaporation device, the drainage device includes a drainage channel and an induced draft fan arranged on the drainage channel, the inlet of the drainage channel is connected to the first dust-removed flue gas conveying channel and / or the denitrified flue gas conveying channel, the outlet of the drainage channel is connected to the evaporation device, the evaporation device uses the flue gas output by the drainage device to heat the liquid SCR denitrification reducing agent to convert the liquid SCR denitrification reducing agent into a gaseous SCR denitrification reducing agent and convey it to the conveying channel of the industrial kiln 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-mentioned dust removal and denitrification device and the industrial silicon smelting flue gas purification and waste heat utilization system cleverly utilize the heat of the flue gas itself to evaporate the liquid SCR reducing agent, reducing additional energy consumption.

[0018] The fourth purpose of the present disclosure is to provide a flue gas desulfurization device and an industrial kiln 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 technology significantly increases the floor space of the industrial silicon smelting flue gas treatment system.

[0019] In this regard, in a fifth aspect, a flue gas desulfurization device is provided, comprising: 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 meandering desulfurization flue, wherein the meandering desulfurization flue is connected between the flue gas input structure and the flue gas output structure, and wherein both ends of the meandering desulfurization flue are respectively connected to the flue gas input structure and the flue gas output structure; a desulfurizer input structure, wherein the desulfurizer input structure is used to add desulfurizer to the flue gas to be desulfurized and / or the flue gas in the meandering desulfurization flue; when in operation, the flue gas supply side equipment to be desulfurized corresponding to the flue gas input structure and the desulfurized flue gas receiving side equipment 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.

[0020] In the sixth aspect, an industrial kiln flue gas purification and waste heat utilization system includes: a first waste heat boiler unit, used to obtain the industrial kiln flue gas and output a first cooled flue gas after performing a first waste heat recovery; a first flue gas filtering dust collector unit, used to obtain the first cooled flue gas and output a first dust-removed flue gas after physically intercepting the dust in the first cooled flue gas through a filter element; an SCR denitrification reactor unit, used to obtain the first dust-removed flue gas added with an SCR denitrification reductant and output denitrified flue gas after passing through an SCR denitrification catalyst; a second waste heat boiler unit, used to obtain the denitrified flue gas and output a second cooled flue gas after performing a second waste heat recovery; a flue gas desulfurization unit, used to obtain the second cooled flue gas added with a desulfurizer and output desulfurized flue gas after performing desulfurization; the flue gas desulfurization unit adopts the flue gas desulfurization device of the fifth aspect above, and the flue gas input structure is used to receive the second cooled flue gas.

[0021] The above-mentioned flue gas desulfurization device and industrial kiln flue gas purification and waste heat utilization system adopts a zigzag desulfurization flue, which can bring the following advantages: 1) High space utilization efficiency: The zigzag desulfurization flue design allows the flue gas flow path to be increased within a limited space, thereby improving space utilization; 2) Extending reaction time and improving desulfurization efficiency: The zigzag desulfurization flue increases the residence time of the flue gas in the zigzag desulfurization flue, providing more sufficient time for the desulfurization reaction. Longer reaction time and path may significantly improve the desulfurization efficiency; 3) Layout optimization: The flue gas supply side equipment to be desulfurized corresponding to the flue gas input structure and the desulfurized flue gas receiving side equipment corresponding to the flue gas output structure are distributed on both sides of the plane formed by the center line of the zigzag desulfurization flue, realizing a compact and reasonable space layout, which helps to reduce the footprint of the industrial silicon smelting flue gas treatment system.

[0022] The fifth purpose of the present disclosure is to provide a flue gas waste heat recovery device and an industrial kiln flue gas purification and waste heat utilization system to solve the problem of complex flue 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 technology.

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

[0024] In an eighth aspect, an industrial kiln flue gas purification and waste heat utilization system is provided, comprising: a first waste heat boiler unit, used to obtain the industrial kiln flue gas and output a first cooled flue gas after performing a first waste heat recovery; a first flue gas filter dust collector unit, used to obtain the first cooled flue gas and output a first dust-removed flue gas after physically intercepting the dust in the first cooled flue gas through a filter element; an SCR denitrification reactor unit, used to obtain the first dust-removed flue gas to which an SCR denitrification reductant is added and output a denitrified flue gas after passing through an SCR denitrification catalyst; a second waste heat boiler unit, used to obtain the denitrified flue gas and output a second cooled flue gas after performing a second waste heat recovery; the first waste heat boiler unit and the second waste heat boiler unit form the flue gas waste heat recovery device of the seventh aspect; wherein, the first flue gas inlet to be cooled is used to obtain the industrial kiln flue gas, and the second flue gas inlet to be cooled is used to obtain the denitrified flue gas.

[0025] The above-mentioned flue gas waste heat recovery device and industrial kiln flue gas purification and waste heat utilization system, by optimizing the layout design of the first waste heat boiler unit and the second waste heat boiler unit, helps to improve the rationality of the spatial layout of the entire industrial kiln flue gas purification and waste heat utilization system.

[0026] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present disclosure will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this specification are used to assist in understanding the present disclosure. The contents provided in the drawings and their related descriptions in this specification may be used to explain the present disclosure, but shall not constitute an improper limitation on the present disclosure.

[0028] Figure 1 A three-dimensional model diagram of an industrial kiln flue gas purification and waste heat utilization system according to an embodiment of the present disclosure.

[0029] Figure 2 for Figure 1 A partial enlarged view of .

[0030] Figure 3 for Figure 1 A partial enlarged view of .

[0031] Figure 4 for Figure 1 A partial enlarged view of .

[0032] Figure 5 for Figure 1 The plan layout of the industrial kiln flue gas purification and waste heat utilization system is shown.

[0033] Figure 6 This is a schematic structural diagram of an improved integrated dust removal and denitrification equipment disclosed in the present invention. DETAILED DESCRIPTION

[0034] The present disclosure is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it should be particularly noted that:

[0035] The technical solutions and technical features provided in each section, 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 assigned specific technical themes and protected by relevant patents.

[0036] The embodiments of the present disclosure involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

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

[0038] Figure 1 A three-dimensional model diagram of an industrial kiln flue gas purification and waste heat utilization system according to an embodiment of the present disclosure. Figure 5 for Figure 1 The plan layout of the industrial furnace flue gas purification and waste heat utilization system is shown in the figure. Figure 1 , Figure 5 As shown, an industrial kiln flue gas purification and waste heat utilization system mainly includes: a first waste heat boiler unit 11, a first flue gas filter 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 industrial silicon smelting flue gas here, the industrial silicon smelting flue gas comes from the industrial silicon smelting ore furnace) and output the first cooled flue gas after performing the first waste heat recovery.

[0040] The first flue gas filter dust collector unit 13 is used to obtain the first cooled flue gas and physically intercept the dust in the first cooled flue gas through a filter element and then output a first dust-removed flue gas.

[0041] The SCR denitration reactor unit 14 is used to obtain the first dust-removed flue gas to which the SCR denitration reducing agent is added and output the denitration flue gas after passing through the SCR denitration catalyst.

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

[0043] The flue gas desulfurization unit 16 is used to obtain the second cooled flue gas to which the desulfurizer is added, perform desulfurization on the second cooled flue gas, and then output the desulfurized flue gas.

[0044] Among them, 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 filter dust collector unit 13 and the SCR denitrification 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-mentioned industrial kiln flue gas purification and waste heat utilization system is: the high-temperature flue gas generated by the industrial silicon smelting ore-heat 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 reduced temperature; the first cooled flue gas enters the first flue gas filter dust collector unit 13, and the dust particles (mainly microsilicon powder) in the flue gas are physically intercepted by the filter element, and the first dust-removed flue gas is output; the first dust-removed flue gas is denitrified after passing through the SCR denitrification reactor unit 14, and the denitrified flue gas is output; the denitrified flue gas enters the second waste heat boiler unit 15 for secondary heat recovery, further reducing the flue gas temperature, and outputting the second cooled flue gas; the second cooled flue gas is desulfurized after passing through the flue gas desulfurization unit 16, and the desulfurized flue gas is output.

[0046] Since the flue gas desulfurization unit 16 is arranged at the second cooled flue gas output end of the second waste heat boiler unit 15, the first flue gas filter dust collector unit 13 can recover micro-silicon powder with higher purity.

[0047] The above-mentioned industrial kiln flue gas purification and waste heat utilization system makes the space occupancy of the industrial kiln flue gas purification and waste heat utilization system compact through the reasonable spatial layout of the first waste heat boiler unit 11, the first flue gas filter dust collector unit 13, the SCR denitrification 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, which helps to shorten the floor space of the industrial silicon smelting flue gas treatment system and save engineering space.

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

[0049] At this time, the industrial furnace flue gas purification and waste heat utilization system also includes a second flue gas filtering dust collector 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 a second dust-removed flue gas.

[0050] The flue gas desulfurization unit 16 and the second flue gas filter dust collector unit 17 are both 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 filter dust collector unit 17 ; the second flue gas filter dust collector unit 17 is arranged between the first flue gas filter dust collector unit 13 and the flue gas desulfurization unit 16 .

[0052] In addition, the second dust-removed flue gas exhaust port of the second flue gas filter dust removal unit 17 is connected to the chimney 19 through the fan 18. Figure 5 As shown, the fan 18 and the chimney 19 are also located in the third ground area C.

[0053] like 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 so that the first waste heat boiler unit 11 and the second waste heat boiler unit 15 constitute an integrated heat exchange device 1A, and 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 located in a first direction; the SCR denitrification reactor unit 14 is assembled on the first flue gas filter dust collector unit 13 to form a dust removal and denitrification integrated device 1B, and the dust removal and denitrification integrated device 1B has a first cooled flue gas inlet and a denitrified flue gas inlet located in a second direction. Denitrification flue gas exhaust port; the integrated heat exchange device 1A is arranged opposite to the dust removal and denitrification integrated device 1B, and the third ground area C is located between the integrated heat exchange device 1A and the dust removal and denitrification integrated device 1B; the first direction and the second direction are relative directions, the first cooled flue gas exhaust port and the first cooled flue gas air inlet are connected to the first cooled flue gas air supply channel 101, the denitrified flue gas air inlet and the denitrified flue gas exhaust port are connected to the denitrified flue gas reflux channel 102, and the second cooled flue gas exhaust port and the flue gas desulfurization unit 16 are connected to the second cooled flue gas air supply channel.

[0054] Since the first cooled flue gas exhaust port, the denitrified flue gas air inlet and the second cooled flue gas exhaust port of the integrated heat exchanger 1A are designed in the first direction (specifically forward here), and the first cooled flue gas air inlet and the denitrified flue gas exhaust port of the integrated dust removal and denitrification equipment 1B are designed in the second direction (specifically backward here), the first direction and the second direction are relative directions. In this way, the first cooled flue gas air supply channel 101 and the denitrified flue gas reflux channel 102 do not need to be bent 180°, which can reduce the construction cost and airflow pressure loss of these flues.

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

[0056] Figure 2 for Figure 1 A partial enlarged view of . Figure 4 for Figure 1 A partial enlarged view of the Figure 2 , Figure 4 As shown, the integrated dust removal and denitrification equipment 1B comprises:

[0057] A) a first box 21, wherein the first box 21 has the following compartments formed by partitions in the first box;

[0058] A1) a left dust collector main cabin body, the left dust collector main cabin body having more than one left dust collector compartment arranged in sequence along the front-to-back direction, each left dust collector compartment having a left dust collector lower raw air cabin and a left dust collector upper clean air cabin, a filter element mounting plate being arranged between the left dust collector lower raw air cabin and the left dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0059] A2) a right dust collector main cabin body, the right dust collector main cabin body having more than one right dust collector compartments arranged in sequence along the front-to-back direction, each right dust collector compartment having a right dust collector lower raw air cabin and a right dust collector upper clean air cabin, a filter element mounting plate being provided between the right dust collector lower raw air cabin and the right dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0060] A3) an intermediate flue main cabin, which is located between the left dust collector main cabin and the right dust collector main cabin and comprises a lower air intake flue cabin 23 and an upper exhaust flue cabin 24, wherein the lower air intake flue cabin 23 extends in the front-to-back direction and is respectively connected to the lower original air cabins of the left dust collectors and the lower original air cabins of the right dust collectors, and the upper exhaust flue cabin 24 extends in the front-to-back direction;

[0061] B) A second box 22, which is arranged on the top of the first box 21 and has a reserved passage on the top surface of the first box 21 and around the second box 22. The second box 22 has the following compartments separated by a partition system in the second box:

[0062] B1) a left air collecting cabin, wherein the lower portion of the left air collecting cabin is arranged above the main cabin body of the left dust collector and is connected to the upper clean air cabin of each left dust collector, and an upper exhaust port of the left air collecting cabin is provided on the upper right partition of the left air collecting cabin;

[0063] B2) a right air collecting cabin, the lower part of which is arranged above the main cabin body of the right dust collector and is connected to the upper clean air cabin of each right dust collector, and an upper exhaust port of the right air collecting cabin is provided on the upper left partition of the right air collecting cabin;

[0064] B3) an intermediate SCR denitration reaction chamber, the intermediate SCR denitration reaction chamber is located between the left gas collecting chamber and the right gas collecting chamber, the upper portion of the intermediate SCR denitration reaction chamber is communicated with the upper exhaust port of the left gas collecting chamber and the upper exhaust port of the right gas collecting chamber respectively, the lower portion of the intermediate SCR denitration reaction chamber is arranged above the intermediate flue main chamber body and is communicated with the upper exhaust flue chamber 24, and an SCR denitration catalyst bed is arranged in the intermediate SCR denitration reaction chamber;

[0065] The total air inlet of the lower air inlet flue compartment 23 and the total exhaust outlet of the upper exhaust flue compartment 24 are arranged on the same side of the first box body 21 in the front-to-rear direction and face the second direction (specifically, are arranged backward).

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

[0067] The above-mentioned dust removal and denitration integrated equipment 1B has the appearance characteristics of a combination of a large box (first box 21) and a small box (second box 22), and the small box is located on the top of the large box. Among them, the internal structure of the large box is relatively common, and the internal structure of the small box and the connection relationship between the small box and the large box are the key innovations of the dust removal and denitration integrated equipment. The small box uses the left air collecting chamber and the right air collecting chamber to introduce the airflow in the upper clean air chamber of each left dust collector and the upper clean air chamber of each right dust collector from bottom to top into the small box, and then passes through the intermediate SCR denitration reaction chamber from top to bottom. The airflow discharged from the intermediate SCR denitration reaction chamber continues to enter the upper exhaust flue chamber 24 downward, and then the dust removal and denitration integrated equipment 1B is discharged through the upper exhaust flue chamber 24. The above-mentioned dust removal and denitration integrated equipment 1B directly uses the upper exhaust flue chamber 24 in the large box to achieve exhaust, and a simple improvement is made on the basis of the existing dust collector structure to realize the dust removal and denitration integrated solution. The advantages of the above-mentioned integrated dust removal and denitrification equipment 1B include simple structure and saving of construction cost, as well as convenient loading and unloading of SCR denitrification catalyst and saving of floor space.

[0068] In a preferred embodiment, the second box 22 is located at the center of the top of the first box 21, and a channel is reserved on the top surface of the first box 21 around the second box 22. In a common embodiment, both the first box 21 and the second box 22 are rectangular boxes.

[0069] In a preferred embodiment, the top plate of the lower air intake flue compartment and the bottom plate of the upper exhaust flue compartment form a conical structure, so that the cross-sectional area of ​​the lower air intake flue compartment in the front-to-back direction gradually decreases along the air intake direction and the cross-sectional area of ​​the upper exhaust flue compartment in the front-to-back direction gradually increases along the exhaust direction.

[0070] In a common implementation, an ash hopper 25 is provided at the bottom of the original air chamber at the bottom of each left dust collector and at the bottom of the original air chamber at the bottom of each right dust collector, and an ash unloading device is provided at the bottom of each ash hopper 25 .

[0071] In an optional implementation, the lower air intake flue chamber 23 is connected to the side of each ash hopper 25 through an independent air intake manifold, and an air intake valve is installed on each air intake manifold.

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

[0073] As a further improvement of the above-mentioned integrated dust removal and denitrification equipment 1B, the SCR denitrification reductant supply unit corresponding to the SCR denitrification reactor unit 14 (the SCR denitrification reductant supply unit is used to supply the SCR denitrification reductant) includes a drainage device 25 and an evaporation device 26, the drainage device 25 includes a drainage channel 251 and an induced draft fan 252 arranged on the drainage channel 251, the inlet of the drainage channel 251 is connected to the conveying channel of the denitrified flue gas, and the outlet of the drainage channel 251 is connected to the evaporation device 26, and the evaporation device 26 uses the flue gas output by the drainage device 25 to heat the liquid SCR denitrification reductant to convert the liquid SCR denitrification reductant into a gaseous SCR denitrification reductant and transport it to the conveying channel of the first dust-removed flue gas.

[0074] 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 cleverly utilizes the heat of the denitrified flue gas itself to evaporate the liquid SCR reducing agent, reducing additional energy consumption.

[0076] Specifically, the induced draft fan 252 is disposed on the first box body 21, and the drainage channel 251 is composed of a drainage pipe, and the drainage pipe 251 is externally connected between the induced draft fan 252 and the main exhaust port of the upper exhaust flue chamber 24. More specifically, the inlet of the drainage pipe 251 is connected to the denitrified 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 temperature of the first cooled flue gas output by the first waste heat boiler unit 11 is 260°C-360°C (optionally, the first waste heat boiler unit 11 adopts a waste heat boiler that outputs the first cooled flue gas temperature of ≥260°C and less than 300°C or adopts a waste heat boiler that outputs the first cooled flue gas temperature of greater than 300°C and ≤360°C), and the second cooled flue gas temperature adopted by the second waste heat boiler unit 15 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 11 is very suitable for the medium and high temperature SCR denitration reaction. Within this temperature range, the activity of the medium and high temperature SCR denitration catalyst is optimal. The temperature of the second cooled flue gas of 140°C-160°C output by the second waste heat boiler unit 15 is higher than the dew point temperature of water and acid in the second cooled flue gas, which can prevent condensation in the flue system and the resulting corrosion problem, and the temperature of the second cooled flue gas can ensure the maximum 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 a 20°C temperature drop from the first cooled flue gas to the denitrified flue gas is considered, the inlet and outlet temperature difference of the second waste heat boiler unit is reduced from 240°C-340°C to 140°C-160°C), therefore, the second waste heat boiler unit 15 is allowed to adopt a more compact design, reduce thermal stress, and extend equipment life; the second waste heat boiler unit 15 can also use more economical materials, such as carbon steel, which significantly reduces manufacturing costs; the lower operating temperature and simplified structure of the second waste heat boiler unit 15 make it easier to maintain and clean the second waste heat boiler unit 15, greatly reducing the downtime and maintenance costs of the second waste heat boiler unit 15; since the inlet and outlet temperature difference of the second waste heat boiler unit 15 is relatively small, the heat exchange surface design can be optimized, such as using denser fins to improve the heat exchange efficiency per unit area.

[0080] Figure 6 The schematic diagram of the structure of an improved integrated dust removal and denitrification equipment disclosed in the present invention is shown in FIG. Figure 6 As shown, the above-mentioned integrated dust removal and denitrification equipment 1B can be adjusted as follows: The integrated dust removal and denitrification equipment includes:

[0081] A) A first box 21, wherein the first box 21 has the following compartments separated by the first box internal partition system:

[0082] A1) a left dust collector main cabin body, the left dust collector main cabin body having more than one left dust collector compartment arranged in sequence along the front-to-back direction, each left dust collector compartment having a left dust collector lower raw air cabin and a left dust collector upper clean air cabin, a filter element mounting plate being arranged between the left dust collector lower raw air cabin and the left dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0083] A2) a right dust collector main cabin body, the right dust collector main cabin body having more than one right dust collector compartments arranged in sequence along the front-to-back direction, each right dust collector compartment having a right dust collector lower raw air cabin and a right dust collector upper clean air cabin, a filter element mounting plate being provided between the right dust collector lower raw air cabin and the right dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0084] A3) an intermediate flue main cabin, the intermediate flue main cabin is located between the left dust collector main cabin and the right dust collector main cabin and has a lower air intake cabin 27 and an upper clean air delivery cabin 28, the lower air intake cabin 27 extends in the front-to-back direction and is respectively connected to the lower original air cabin of each left dust collector and the lower original air cabin of each right dust collector, the upper clean air delivery cabin 28 is located above the lower air intake cabin 27, extends in the front-to-back direction and is respectively connected to the upper clean air cabin of each left dust collector and the upper clean air cabin of each right dust collector;

[0085] B) A second box 22, which is arranged at the rear of the first box 21, and has the following compartments formed by the partition system in the second box:

[0086] B1) a front air collecting cabin 29, the lower part of which is arranged at the rear of the upper clean air delivery cabin and communicated with the upper clean air delivery cabin, and the upper part of the front air collecting cabin is provided with an upper exhaust port of the front air collecting cabin;

[0087] B2) A rear SCR denitration reaction chamber 210, wherein the rear SCR denitration reaction chamber is arranged at the rear of the front air collecting chamber, the upper portion of the rear SCR denitration reaction chamber is communicated with the upper exhaust port of the front air collecting chamber, the lower portion of the rear SCR denitration reaction chamber is provided with a rear SCR denitration reaction chamber lower exhaust port, and an SCR denitration catalyst bed 211 is arranged in the rear SCR denitration reaction chamber.

[0088] Figure 6The integrated dust removal and denitrification equipment shown has the appearance characteristics of a combination of a large box (first box 21) and a small box (second box 22), and the small box is located at the rear of the large box. The upper clean air conveying cabin of the large box combined with the connection relationship between the small box and the large box is the key innovation of the integrated dust removal and denitrification equipment. Since the small box is located at the rear of the large box, the large box does not need to bear the weight of the small box. The large box guides the airflow into the small box through the upper clean air conveying cabin 28, which simply realizes the connection between the large box and the small box. The advantages of the above-mentioned integrated dust removal and denitrification equipment are simple structure and can save construction costs.

[0089] As needed, the intermediate flue main cabin body also has a middle exhaust flue cabin 212 located between the lower air intake flue cabin 27 and the upper clean air delivery cabin 28, and the middle exhaust flue cabin 212 extends in the front-to-back direction; the lower exhaust port of the rear SCR denitrification reaction cabin is connected to the rear end of the middle exhaust flue cabin 212; the total air intake port of the lower air intake flue cabin 27 and the total exhaust port of the middle exhaust flue cabin 212 are arranged on the same side of the first box body (specifically the rear side here).

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

[0091] Specifically, the induced draft fan 252 is disposed on the first box body 21, and the drainage channel 251 is composed of a drainage pipe, and the drainage pipe 251 is externally connected between the induced draft fan 252 and the main exhaust port of the middle exhaust flue chamber 212. More specifically, the inlet of the drainage pipe 251 is connected to the denitrified flue gas return channel 102.

[0092] Figure 3 for Figure 1 A partial enlarged view of the Figure 3As shown, the flue gas desulfurization unit 16 includes: a flue gas input structure 161, a flue gas output structure 162, a meandering 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, which is specifically the first flue gas conveying pipeline changing joint here; the flue gas output structure 163 is used to output the desulfurized flue gas, which is specifically the second flue gas conveying pipeline changing joint here; the meandering desulfurization flue 163 is connected between the flue gas input structure 161 and the flue gas output structure 162, and the two ends of the meandering desulfurization flue 163 are respectively connected to the flue gas input structure 161 and the flue gas output structure 162; the desulfurizer input structure is used to add desulfurizer to the flue gas to be desulfurized and / or the flue gas in the meandering desulfurization flue 163; when working, the flue gas supply side equipment to be desulfurized corresponding to the flue gas input structure 161 (i.e., the second waste heat boiler unit 15) and the desulfurized flue gas receiving side equipment corresponding to the flue gas output structure 163 (i.e., the second flue gas filter dust collector unit 17) are distributed on both sides of the plane formed by the center line of the meandering desulfurization flue 163.

[0093] The above-mentioned flue gas desulfurization unit 16 adopts a meandering desulfurization flue 163, which can bring the following advantages: 1) High space utilization efficiency: The meandering desulfurization flue 163 design allows the increase of the flue gas flow path within a limited space, thereby improving space utilization; 2) Extending the reaction time and improving the desulfurization efficiency: The meandering desulfurization flue 163 increases the residence time of the flue gas in the meandering desulfurization flue 163, providing more sufficient time for the desulfurization reaction. Longer reaction time and path may significantly improve the desulfurization efficiency; 3) Layout optimization: The flue gas supply side equipment to be desulfurized corresponding to the flue gas input structure 161 and the desulfurized flue gas receiving side equipment corresponding to the flue gas output structure 162 are distributed on both sides of the plane formed by the center line of the meandering desulfurization flue 163, thereby realizing a compact and reasonable spatial layout, which helps to reduce the system's footprint.

[0094] 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 meander-shaped desulfurization flue 163 .

[0095] The smoke input structure 161 and the smoke output structure 162 may be staggered up and down and / or left and right.

[0096] like Figure 3As shown, the denitrified flue gas reflow channel 102 is located above the second flue gas filter dust collector unit 17 and the second cooled flue gas supply channel and passes through the annular area surrounded by the meandering desulfurization flue 163, and an openable and closable denitrified flue gas reflow manifold 164 is connected between the denitrified flue gas reflow channel 163 and the flue gas output structure 162 or the flue gas input structure 161 (the denitrified flue gas reflow manifold 164 can be controlled to be on and off by a gate valve). When the denitrified flue gas reflow manifold 164 is opened, the denitrified flue gas can flow to the flue gas output structure 162 or the flue gas input structure 161 through the denitrified flue gas reflow manifold 164.

[0097] The above structure is compact in layout and can further save space. The denitrified flue gas return 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 filter dust collector 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 filter dust collector unit 17 after desulfurization in the meander desulfurization flue 163.

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

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

[0100] The above is a description of the relevant contents of the present disclosure. A person skilled in the art will be able to implement the present disclosure based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. 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; Features: The first waste heat boiler unit adopts a waste heat boiler that outputs a first cooled flue gas temperature of 260°C-360°C, and the second waste heat boiler unit adopts a waste heat boiler that outputs a second cooled flue gas temperature of 140°C-160°C.

2. The industrial furnace fume purification and waste heat utilization system according to claim 1, characterized in that: It also includes a flue gas desulfurization unit, which is used to obtain the second cooled flue gas added with a desulfurizer and desulfurize it to output the desulfurized flue gas.

3. The industrial furnace fume purification and waste heat utilization system according to claim 2, 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, and the third ground area is located between the first ground area and the second ground area.

4. The industrial furnace fume purification and waste heat utilization system according to claim 3, characterized in that: The flue gas desulfurization unit is used to obtain the second cooled flue gas to which a desulfurizer is added and remove sulfur in the gas phase from the gas phase in the form of a solid phase or a carrier through the desulfurizer to obtain desulfurized flue gas; It also includes a second flue gas filter dust collector unit, 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 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, and 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.

5. The industrial furnace fume purification and waste heat utilization system according to claim 4, 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.

6. The industrial furnace fume purification and waste heat utilization system according to claim 5, characterized in that: A mechanical dust collector is connected in series on the first cooled flue gas supply channel. The mechanical dust collector is arranged in the third ground area and is located beside the flue gas desulfurization unit.

7. The industrial furnace fume purification and waste heat utilization system according to claim 5, characterized in that: The mechanical dust collector is a cyclone dust collector.

8. The industrial furnace fume purification and waste heat utilization system according to claim 5, characterized in that: The integrated dust removal and denitrification equipment comprises: A) A first box, wherein the first box has the following compartments formed by the partition system in the first box: A1) a left dust collector main cabin body, the left dust collector main cabin body having more than one left dust collector compartment arranged in sequence along the front-to-back direction, each left dust collector compartment having a left dust collector lower raw air cabin and a left dust collector upper clean air cabin, a filter element mounting plate being arranged between the left dust collector lower raw air cabin and the left dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin; A2) a right dust collector main cabin body, the right dust collector main cabin body having more than one right dust collector compartments arranged in sequence along the front-to-back direction, each right dust collector compartment having a right dust collector lower raw air cabin and a right dust collector upper clean air cabin, a filter element mounting plate being provided between the right dust collector lower raw air cabin and the right dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin; A3) an intermediate flue main cabin body, the intermediate flue main cabin body is located between the left dust collector main cabin body and the right dust collector main cabin body and comprises a lower air intake flue cabin and an upper exhaust flue cabin, the lower air intake flue cabin extends in the front-to-back direction and is respectively connected to the lower original air cabins of each left dust collector and the lower original air cabins of each right dust collector, and the upper exhaust flue cabin extends in the front-to-back direction; B) A second box, which is arranged on the top of the first box and has a reserved passage on the top surface of the first box at the periphery of the second box. The second box has the following compartments separated by a partition system inside the second box: B1) a left air collecting cabin, wherein the lower portion of the left air collecting cabin is arranged above the main cabin body of the left dust collector and is connected to the upper clean air cabin of each left dust collector, and an upper exhaust port of the left air collecting cabin is provided on the upper right partition of the left air collecting cabin; B2) a right air collecting cabin, the lower part of which is arranged above the main cabin body of the right dust collector and is connected to the upper clean air cabin of each right dust collector, and an upper exhaust port of the right air collecting cabin is provided on the upper left partition of the right air collecting cabin; B3) an intermediate SCR denitration reaction chamber, the intermediate SCR denitration reaction chamber is located between the left gas collecting chamber and the right gas collecting chamber, the upper portion of the intermediate SCR denitration reaction chamber is communicated with the upper exhaust port of the left gas collecting chamber and the upper exhaust port of the right gas collecting chamber respectively, the lower portion of the intermediate SCR denitration reaction chamber is arranged above the intermediate flue main chamber body and communicated with the upper exhaust flue chamber, and an SCR denitration catalyst bed is arranged in the intermediate SCR denitration reaction chamber; Wherein, the total air inlet of the lower air inlet flue compartment and the total exhaust outlet of the upper exhaust flue compartment are arranged on the same side in the front-to-rear direction of the first box body and face the second direction.

9. The industrial furnace fume purification and waste heat utilization system according to claim 8, characterized in that: The first box body and the second box body are both rectangular boxes; The second box is located at the center of the top of the first box, and a channel is reserved on the top surface of the first box around the periphery of the second box; And / or, the top plate of the lower air intake flue chamber and the bottom plate of the upper exhaust flue chamber form a tapered structure, so that the cross-sectional area of ​​the lower air intake flue chamber in the front-to-back direction gradually decreases along the air intake direction and the cross-sectional area of ​​the upper exhaust flue chamber in the front-to-back direction gradually increases along the exhaust direction; And / or, an ash hopper is provided at the bottom of the original air chamber at the lower part of each left dust collector and at the bottom of the original air chamber at the lower part of each right dust collector, and an ash unloading device is provided at the bottom of each ash hopper.

10. The industrial furnace fume purification and waste heat utilization system according to claim 1, characterized in that: The industrial furnace flue gas is the smelting flue gas of industrial silicon; And / or, the first waste heat boiler unit adopts a waste heat boiler that outputs a first cooled flue gas temperature of ≥260°C and less than 300°C or adopts a waste heat boiler that outputs a first cooled flue gas temperature of greater than 300°C and ≤360°C.

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