Dust removal and denitration device and industrial silicon smelting flue gas purification and waste heat utilization system

Abstract

The utility model discloses a dust removal and denitration device and an industrial silicon smelting flue gas purification and waste heat utilization system. The dust removal and denitration device comprises a flue gas dust remover unit, an SCR denitration reactor unit and an SCR denitration reducing agent supply unit, the SCR denitration reducing agent supply unit comprises a drainage device and an evaporation device, the drainage device comprises a drainage channel and an induced draft fan arranged on the drainage channel, and an inlet of the drainage channel is connected with the conveying channel of the dedusted flue gas and / or the conveying channel of the denitrated flue gas; an outlet of the drainage channel is connected with the evaporation device, and the evaporation device uses the flue gas output by the drainage device to heat a liquid SCR denitration reducing agent, so that the liquid SCR denitration reducing agent is converted into a gas SCR denitration reducing agent, and the gas SCR denitration reducing agent is conveyed to the conveying channel of the flue gas to be dedusted and / or the conveying channel of the dedusted flue gas. And the liquid SCR reducing agent is evaporated by utilizing heat of the flue gas, so that extra energy consumption is reduced.

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, in patent publication CN114887409A, provides an industrial silicon smelting flue gas treatment system. This system first uses a first waste heat boiler unit to condition the flue gas discharged from the industrial silicon smelting furnace, which has a temperature of 450°C to 650°C, to a first cooled flue gas with a temperature of 300°C to 450°C. This first cooled flue gas is then filtered and dust-purified by a flue gas filter and dust collector unit, and then treated as dust-removed flue gas. This dust-removed flue gas is then denitrated by an SCR denitrification reactor unit to produce denitrated flue gas. This denitrated flue gas is then treated by a second waste heat boiler unit to a second cooled flue gas with a temperature of 100°C to 200°C. The second cooled flue gas then enters a desulfurization unit for desulfurization. In actual use, this industrial silicon smelting flue gas treatment system has been found to have the following technical problems:

[0003] First, the desulfurization device is installed after the second waste heat boiler unit. When the desulfurization device selects dry desulfurization, since the exhaust gas after dry desulfurization will be mixed with a certain concentration of particulate matter (particulate matter includes residual desulfurizer and the reaction product of desulfurizer and sulfur dioxide), it is necessary to install dust removal equipment after the desulfurization device, resulting in a longer 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, significantly increasing 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 SCR denitrification reactor unit operates by injecting ammonia (the SCR denitrification reducing agent) into the denitrified flue gas under the action of a catalyst, reducing nitrogen oxides in the denitrified flue gas to nitrogen and water. To provide ammonia, aqueous ammonia is typically heated to 130°C-150°C using a heater; however, this approach consumes a lot of energy, reducing the economic efficiency 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 kiln 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 long footprint of the industrial silicon smelting flue gas treatment system.

[0008] In this regard, the first 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 perform a first waste heat recovery to output a first cooled flue gas; a first flue gas filter 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 and then output a first dust-removed flue gas; an SCR denitrification reactor unit, used to obtain the first dust-removed flue gas added with an SCR denitrification reducing agent 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 perform a first waste heat recovery to output a first dust-removed flue gas; After the second waste heat is recovered, a second cooled flue gas is output; 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 occupation 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 space.

[0010] The second purpose of the present disclosure is to provide an industrial kiln 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 perform a first waste heat recovery to output a first cooled flue gas; a first flue gas filter 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 denitrification reactor unit, used to obtain the first dust-removed flue gas added with an SCR denitrification reducing agent 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 perform a second waste heat recovery to output a second cooled flue gas; the first waste heat boiler unit adopts a waste heat boiler that outputs the first cooled flue gas at a temperature of 260℃-360℃, and the second waste heat boiler unit adopts a waste heat boiler that outputs the second cooled flue gas at a temperature of 140℃-160℃.

[0012] The first HRSG unit in the industrial kiln flue gas purification and waste heat utilization system outputs a first cooled flue gas temperature of 260°C to 360°C (optionally, the first HRSG unit utilizes a HRSG with a first cooled flue gas temperature of ≥260°C and less than 300°C, or a HRSG with a first cooled flue gas temperature greater than 300°C and less than 360°C). The second HRSG unit utilizes a second cooled flue gas temperature of 140°C to 160°C. The 260°C to 360°C first cooled flue gas temperature output by the first HRSG unit is ideal for medium- and high-temperature SCR denitrification reactions, where the activity of the medium- and high-temperature SCR denitrification catalyst is optimal. The 140°C to 160°C second cooled flue gas temperature output by the second HRSG unit is both above the dew point of water and acid in the second cooled flue gas, preventing condensation and the resulting corrosion in the flue system. Furthermore, the second cooled flue gas temperature ensures maximum energy efficiency while effectively avoiding acid condensation.

[0013] In addition, the inlet and outlet temperature difference of the second waste heat boiler unit 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 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, the third aspect provides a dust removal and denitrification device, 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 device and the 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 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 to convert the liquid SCR denitrification reducing agent into a gaseous SCR denitrification reducing agent and transport 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, comprising: a first waste heat boiler unit, for obtaining the smelting flue gas and performing a first waste heat recovery to output a first cooled flue gas; a first flue gas filter 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 to output a first dust-removed flue gas; an SCR denitrification reactor unit, for obtaining the first dust-removed flue gas to which an SCR denitrification reducing agent is added and outputting a denitrified flue gas after passing through an SCR denitrification catalyst; an SCR denitrification reducing agent supply unit, for supplying a first dust-removed flue gas to the conveying channel of the smelting 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 smelting flue gas conveying channel and / or the first cooled flue gas conveying channel and / or the first dust-removed flue gas conveying channel.

[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 in the background technology that the desulfurization device in the industrial silicon smelting flue gas treatment system significantly increases the floor space of the industrial silicon smelting flue gas treatment system.

[0019] In this regard, the fifth aspect provides a flue gas desulfurization device, including: a flue gas input structure, the flue gas input structure is used to receive the flue gas to be desulfurized; a flue gas output structure, the flue gas output structure is used to output the desulfurized flue gas; a meandering desulfurization flue, the meandering desulfurization flue is connected between the flue gas input structure and the flue gas output structure, and the two 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, 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 working, 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 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 reducing agent 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 mentioned 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 spatial 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 outer shell of the first waste heat boiler unit, and when in use, the first flue gas inlet to be cooled and the first cooled 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 outer 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 gas outlet 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 the eighth 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 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 reducing agent 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 above; 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 learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings that constitute a part of this specification are used to assist in understanding the present disclosure. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present disclosure, but do not constitute improper limitations on the present disclosure.

[0028] Figure 1 A three-dimensional model diagram of the 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 herein. DETAILED DESCRIPTION

[0034] The present disclosure is described clearly and completely below with reference to 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 with reference to the accompanying drawings, it should be noted that:

[0035] The technical solutions and technical features provided in each section, including the following description, may be combined with each other unless they conflict. In addition, where possible, these technical solutions, technical features, and related combinations may 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 any creative work should fall within the scope of patent protection.

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

[0038] Figure 1 A three-dimensional model diagram of the 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, industrial silicon smelting flue gas, which comes from an industrial silicon smelting ore furnace) and perform first waste heat recovery and then output first cooled flue gas.

[0040] The first flue gas filter dust collector unit 13 is used to obtain the first cooled flue gas and physically intercept 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 an SCR denitration reducing agent is added and output the denitration flue gas after passing through an 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-fired 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 microsilica 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; 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.

[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 microsilica powder with higher purity.

[0047] The above-mentioned industrial kiln flue gas purification and waste heat utilization system makes the space occupation 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 project 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 carrier through the desulfurizer to obtain desulfurized flue gas.

[0049] At this time, the industrial kiln flue gas purification and waste heat utilization system also includes a second flue gas filter 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 exchanger 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 exchanger 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 return channel 102 do not need to bend 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. 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 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 includes:

[0057] A) a first housing 21, wherein the first housing 21 has the following compartments formed by a first housing internal partition system;

[0058] A1) a left dust collector main cabin, the left dust collector main cabin having one or more left dust collector compartments arranged in sequence along the front-to-rear direction, each left dust collector compartment containing a left dust collector lower raw air compartment and a left dust collector upper clean air compartment, a filter element mounting plate provided between the left dust collector lower raw air compartment and the left dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment;

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

[0060] A3) an intermediate flue main compartment, located between the left and right dust collector main compartments and comprising a lower air intake compartment 23 and an upper exhaust compartment 24. The lower air intake compartment 23 extends in the front-to-back direction and communicates with the lower raw air compartments of the left and right dust collectors, respectively. The upper exhaust compartment 24 extends in the front-to-back direction.

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

[0062] B1) a left air collecting cabin, the lower portion of which is disposed above the main cabin body of the left dust collector and communicates with 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 portion of which is disposed above the main cabin body of the right dust collector and communicates with 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 being located between the left and right gas collecting chambers, the upper portion of the intermediate SCR denitration reaction chamber being in communication with the upper exhaust ports of the left and right gas collecting chambers, respectively, the lower portion of the intermediate SCR denitration reaction chamber being located above the intermediate flue main chamber body and in communication with the upper exhaust flue chamber 24, and an SCR denitration catalyst bed being provided in the intermediate SCR denitration reaction chamber;

[0065] The main air inlet of the lower air inlet flue compartment 23 and the main exhaust port 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, rearward).

[0066] The filter element may 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 denitrification equipment is low, the filter element may also be a cloth bag.

[0067] The above-mentioned integrated dust removal and denitrification 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 integrated dust removal and denitrification 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 denitrification reaction chamber from top to bottom. The airflow discharged from the intermediate SCR denitrification reaction chamber continues downward to enter the upper exhaust flue chamber 24, and thus is discharged from the integrated dust removal and denitrification equipment 1B through the upper exhaust flue chamber 24. The above-mentioned integrated dust removal and denitrification equipment 1B directly uses the upper exhaust flue chamber 24 in the large box to achieve exhaust. A simple improvement is made on the basis of the existing dust collector structure to realize the integrated dust removal and denitrification solution. The advantages of the above-mentioned integrated dust removal and denitrification equipment 1B include a simple structure and reduced construction costs, as well as convenient loading and unloading of the SCR denitrification catalyst and reduced 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 raw air chamber at the lower portion of each left dust collector and at the bottom of the raw air chamber at the lower portion of each right dust collector, and an ash unloading device is provided at the bottom of each ash hopper 25 .

[0071] In an optional embodiment, 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 one above the other are provided in the intermediate SCR denitration reaction chamber.

[0073] As a further improvement to 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, 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 aqueous ammonia, 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 housing 21, and the drainage channel 251 is formed by a drainage pipe. 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] As a result, the temperature of the first cooled flue gas output by the first HRSG unit 11 is between 260°C and 360°C (optionally, the first HRSG unit 11 utilizes a HRSG that outputs a first cooled flue gas temperature of ≥260°C and less than 300°C, or a HRSG that outputs a first cooled flue gas temperature greater than 300°C and less than 360°C). The second HRSG unit 15 utilizes a second cooled flue gas temperature of 140°C to 160°C. The 260°C to 360°C first cooled flue gas output by the first HRSG unit 11 is ideally suited for medium- and high-temperature SCR denitration reactions, where the activity of the medium- and high-temperature SCR denitration catalyst is optimal. The 140°C to 160°C second cooled flue gas output by the second HRSG unit 15 is both above the dew point of water and acid in the second cooled flue gas, preventing condensation and the resulting corrosion in the flue system. Furthermore, the second cooled flue gas temperature ensures maximum energy efficiency while 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, significantly reducing manufacturing costs; the lower operating temperature and simplified structure of the second waste heat boiler unit 15 make the second waste heat boiler unit 15 easier to maintain and clean, 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 This is a schematic diagram of the structure of an improved integrated dust removal and denitrification equipment disclosed in the present invention. Figure 6 As shown, the above-mentioned integrated dust removal and denitrification equipment 1B can be adjusted to: the integrated dust removal and denitrification equipment includes:

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

[0082] A1) a left dust collector main cabin, the left dust collector main cabin having one or more left dust collector compartments arranged in sequence along the front-to-rear direction, each left dust collector compartment containing a left dust collector lower raw air compartment and a left dust collector upper clean air compartment, a filter element mounting plate provided between the left dust collector lower raw air compartment and the left dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment;

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

[0084] A3) an intermediate flue main cabin, located between the left and right dust collector main cabins and comprising 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 in communication with the lower raw air cabins of the left and right dust collectors, respectively. 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 in communication with the upper clean air cabins of the left and right dust collectors, respectively.

[0085] B) A second box 22, which is arranged at the rear of the first box 21. The interior of the second box 22 has the following compartments separated by a second box internal partition system:

[0086] B1) a front air collecting cabin 29, the lower portion of which is arranged at the rear of the upper clean air delivery cabin and communicates with the upper clean air delivery cabin, and the upper portion 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 gas collecting chamber, the upper portion of the rear SCR denitration reaction chamber is connected to the upper exhaust port of the front gas 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 provided in the rear SCR denitration reaction chamber.

[0088] Figure 6The integrated dust removal and denitrification equipment shown has an appearance feature 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 to 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, 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 housing 21, and the drainage channel 251 is formed by a drainage pipe. 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 for increasing the flue gas flow path within a limited space, thereby improving space utilization; 2) Extending reaction time and improving 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, 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 meandering desulfurization flue 163 .

[0095] The smoke input structure 161 and the smoke output structure 162 may be staggered vertically and / or horizontally.

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

[0097] The above-described structure has a compact layout, further saving space. Denitrified flue gas return manifold 164 can direct denitrified flue gas to flue gas output structure 162 or flue gas input structure 161 during maintenance of the second waste heat boiler unit 15. Denitrified flue gas directed to flue gas output structure 162 can flow from flue gas output structure 162 to the second flue gas filter and dust collector unit 17, while denitrified flue gas directed to flue gas input structure 161 can flow from flue gas output structure 162 to the second flue gas filter and dust collector unit 17 after desulfurization in the meandering 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) on its outer shell. When in use, the first flue gas inlet to be cooled and the first flue gas outlet to be cooled are respectively connected to the corresponding flue through an expansion joint. The second waste heat boiler unit 15 is arranged on the left or right side of the first waste heat boiler unit 11. 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 respectively provided on its outer shell. When in use, the second flue gas inlet to be cooled and the second flue gas outlet to be cooled are respectively connected to the corresponding flue through an expansion joint. 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 an interval between them.

[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 describes the relevant contents of the present disclosure. Based on these descriptions, a person of ordinary skill in the art will be able to implement the present disclosure. Based on the above contents of this specification, all other embodiments obtained by a person of ordinary skill in the art without making any creative effort should fall within the scope of patent protection.

Claims

1. A dust removal and denitrification device, comprising: A flue gas dust collector unit is used to obtain the flue gas to be dusted, perform dust removal on it, and then output the dust-removed flue gas; An SCR denitration reactor unit is used to obtain the dust-removed flue gas to which an SCR denitration reducing agent is added, and output the denitrated flue gas after passing it through an SCR denitration catalyst; An SCR denitration reducing agent supply unit is used to add the SCR denitration reducing agent to the conveying channel of the flue gas to be dedusted and / or the conveying channel of the dedusted flue gas; Its characteristics are: 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 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. 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 transport it to the conveying channel of the flue gas to be dust-removed and / or the conveying channel of the dust-removed flue gas.

2. A dust removal and denitrification device according to claim 1, characterized in that: The flue gas dust collector unit is a flue gas filtering dust collector unit, which is used to obtain the flue gas to be dust-removed and physically intercept the dust in the flue gas to be dust-removed through a filter element and then output the dust-removed flue gas.

3. A dust removal and denitrification device according to claim 2, characterized in that: The SCR denitration reactor unit is assembled on the flue gas filter dust collector unit to form an integrated dust removal and denitration device.

4. A dust removal and denitrification device according to claim 3, characterized in that: The integrated dust removal and denitrification equipment includes: A) A first box, wherein the first box has the following compartments formed by the first box internal partition system: A1) a left dust collector main cabin, the left dust collector main cabin having one or more left dust collector compartments arranged in sequence along the front-to-rear direction, each left dust collector compartment containing a left dust collector lower raw air compartment and a left dust collector upper clean air compartment, a filter element mounting plate provided between the left dust collector lower raw air compartment and the left dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment; A2) a right dust collector main cabin body, the right dust collector main cabin body having one or more right dust collector compartments arranged in a front-to-rear direction, each right dust collector compartment containing a right dust collector lower raw air compartment and a right dust collector upper clean air compartment, a filter element mounting plate provided between the right dust collector lower raw air compartment and the right dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment; A3) an intermediate flue main compartment, located between the left dust collector main compartment and the right dust collector main compartment, and comprising a lower air intake compartment and an upper exhaust compartment. The lower air intake compartment extends in the front-to-back direction and is in communication with the lower raw air compartments of the left dust collector and the lower raw air compartments of the right dust collector, respectively. The upper exhaust compartment extends in the front-to-back direction. B) A second box, which is arranged on 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 interior of the second box has the following compartments separated by a partition system inside the second box: B1) a left air collecting cabin, the lower portion of which is disposed above the main cabin body of the left dust collector and communicates with 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 portion of which is disposed above the main cabin body of the right dust collector and communicates with 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, wherein 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 being in communication 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 being arranged above the intermediate flue main chamber body and in communication with the upper exhaust flue chamber, and an SCR denitration catalyst bed being arranged in the intermediate SCR denitration reaction chamber.

5. The dust removal and denitrification device according to claim 4, characterized in that: The inlet of the drainage channel is communicated with the upper exhaust flue chamber.

6. A dust removal and denitrification device according to claim 5, characterized in that: The induced draft fan is arranged on the first box body, and the drainage channel is composed of a drainage pipe. The drainage pipe is externally connected between the induced draft fan and the main exhaust port of the upper exhaust flue cabin.

7. The dust removal and denitrification device according to claim 3, characterized in that: The integrated dust removal and denitrification equipment includes: A) A first box, wherein the first box has the following compartments formed by the first box internal partition system: A1) a left dust collector main cabin, the left dust collector main cabin having one or more left dust collector compartments arranged in sequence along the front-to-rear direction, each left dust collector compartment containing a left dust collector lower raw air compartment and a left dust collector upper clean air compartment, a filter element mounting plate provided between the left dust collector lower raw air compartment and the left dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment; A2) a right dust collector main cabin body, the right dust collector main cabin body having one or more right dust collector compartments arranged in a front-to-rear direction, each right dust collector compartment containing a right dust collector lower raw air compartment and a right dust collector upper clean air compartment, a filter element mounting plate provided between the right dust collector lower raw air compartment and the right dust collector upper clean air compartment, a filter element mounted on the filter element mounting plate extending downwardly into the left dust collector lower raw air compartment; A3) an intermediate flue main compartment, located between the left dust collector main compartment and the right dust collector main compartment, and comprising a lower air intake compartment and an upper clean air delivery compartment. The lower air intake compartment extends in the front-to-back direction and is in communication with the lower raw air compartments of the left dust collectors and the lower raw air compartments of the right dust collectors, respectively. The upper clean air delivery compartment is located above the lower air intake compartment, extends in the front-to-back direction, and is in communication with the upper clean air compartments of the left dust collectors and the upper clean air compartments of the right dust collectors, respectively. B) a second box, which is arranged at the rear of the first box and has the following compartments formed by a partition system inside the second box: B1) a front gas collecting cabin, wherein the lower portion of the front gas collecting cabin is arranged at the rear of the upper clean air delivery cabin and is in communication with the upper clean air delivery cabin, and the upper portion of the front gas collecting cabin is provided with a front gas collecting cabin upper exhaust port; B2) a rear SCR denitration reaction chamber, wherein the rear SCR denitration reaction chamber is arranged at the rear of the front gas collecting chamber, the upper portion of the rear SCR denitration reaction chamber is connected to the upper exhaust port of the front gas 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 is provided in the rear SCR denitration reaction chamber.

8. The dust removal and denitrification device according to claim 7, characterized in that: The intermediate flue main cabin body also has a middle exhaust flue cabin located between the lower air intake flue cabin and the upper clean air delivery cabin, and the middle exhaust flue cabin 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; the total air intake port of the lower air intake flue cabin and the total exhaust port of the middle exhaust flue cabin are arranged on the same side of the first box body; the entrance of the drainage channel is connected to the middle exhaust flue cabin.

9. The dust removal and denitrification device according to claim 1, characterized in that: The liquid SCR denitration reducing agent is ammonia water, and the gaseous SCR denitration reducing agent is ammonia gas.

10. An industrial silicon smelting flue gas purification and waste heat utilization system, comprising: a first waste heat boiler unit, configured to obtain the smelting flue gas, recover the first waste heat, and then output a first cooled flue gas; a first flue gas filter dust collector unit, configured to obtain the first cooled flue gas, physically intercept dust in the first cooled flue gas through a filter element, and then output 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 pass the first dust-removed flue gas through an SCR denitration catalyst to output denitration flue gas; An SCR denitration reducing agent supply unit is used to add the SCR denitration reducing agent to the conveying channel of the smelting 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; Its characteristics are: 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 conveying channel of the first 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. 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 transport it to the conveying channel of the smelting 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.

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