Denitration, deamination and CO removal integrated device for sintering flue gas

Abstract

The utility model belongs to the technical field of sintering devices, and particularly relates to a denitration, deamination and CO removal integrated device for sintering flue gas. The sintering flue gas denitration, deamination and CO removal integrated device comprises an ammonia spraying part, an SCR denitration reaction part, a deamination reaction part and a carbon monoxide reaction part, wherein the SCR denitration reaction part, the deamination reaction part and the carbon monoxide reaction part are sequentially communicated with one another in the flue gas flowing direction; the ammonia spraying part is communicated with the upstream of the SCR denitration reaction part along the flowing direction of the flue gas and is used for mixing ammonia gas with the flue gas to be treated and then feeding the mixture into the SCR denitration reaction part; the carbon monoxide reaction part is provided with a carbon monoxide catalyst for removing carbon monoxide in the flue gas. When the sintering flue gas denitration, deamination and CO removal integrated device provided by the utility model runs, flue gas to be treated enters the ammonia spraying part to be mixed with ammonia gas and then sequentially enters the SCR denitration reaction part, the deamination reaction part and the carbon monoxide reaction part to be subjected to denitration, deamination and CO removal treatment, so that the aim of cooperatively controlling denitration, deamination and CO removal of the sintering flue gas is fulfilled.

Description

Technical Field

[0001] This utility model belongs to the technical field of sintering equipment, specifically relating to an integrated device for denitrification, deammoniation and CO removal of sintering flue gas. Background Technology

[0002] With increasingly stringent NOx emission standards in China's steel sintering industry, achieving ultra-low or even ultra-ultra-low NOx emissions necessitates a significant increase in ammonia injection for SCR denitrification, leading to widespread and severe ammonia slip exceeding standards. Excessive ammonia slip not only poses a corrosion risk to downstream equipment such as flue gas ducts and heat exchangers, but also, when released into the atmosphere, becomes positive ions that generate PM2.5 sulfates and nitrates, exacerbating PM2.5 concentrations and negatively impacting surrounding air quality. Furthermore, carbon monoxide emission reduction in the steel sintering industry has gained increasing attention in recent years. Currently, the mainstream flue gas treatment process for sintering flue gas is flue gas desulfurization → flue gas reheat → SCR denitrification → chimney emission, with CO removal processes added on top of this. The mainstream carbon monoxide emission reduction process is catalytic oxidation. Because the reaction temperature ranges for denitrification and CO removal are relatively close, an SCR catalyst layer is typically used for support, with the carbon monoxide catalyst placed at the bottom of the SCR reactor. However, ammonia slip in SCR denitrification can easily lead to problems such as decreased carbon monoxide catalyst efficiency and poisoning / deactivation, meaning that SCR denitrification and carbon monoxide emission reduction are mutually restrictive. In summary, current SCR denitrification systems generally suffer from excessive ammonia slip, affecting air quality and limiting the efficiency and lifespan of carbon monoxide catalysts. Utility Model Content

[0003] The purpose of this invention is to solve the problem of synergistic control of ammonia and removal of carbon monoxide in sintering flue gas. It provides an integrated device for denitrification, ammonia removal and CO removal of sintering flue gas, which not only solves the problem of excessive ammonia escape in SCR reaction and reduces secondary pollution, but also improves the removal efficiency of carbon monoxide, responding to the call for carbon monoxide emission reduction.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An integrated device for denitrification, ammonia removal, and CO removal of sintering flue gas includes: an ammonia injection section and an SCR denitrification reaction section, an ammonia removal reaction section, and a carbon monoxide reaction section that are sequentially connected to each other along the flue gas flow direction; the ammonia injection section is connected upstream of the SCR denitrification reaction section along the flue gas flow direction, and is used to mix ammonia with the flue gas to be treated before entering the SCR denitrification reaction section; the ammonia removal section is provided with an ammonia removal catalyst for removing ammonia from the flue gas; the carbon monoxide reaction section is provided with a carbon monoxide catalyst for removing carbon monoxide from the flue gas.

[0006] In some specific embodiments, the SCR denitrification reaction section, the ammonia removal reaction section, and the carbon monoxide reaction section are sequentially arranged in the same reactor along the flue gas flow direction.

[0007] In some specific embodiments, the reactor is connected to the ammonia injection section through the reactor inlet flue, and the purified flue gas is discharged from the reactor outlet.

[0008] In some specific embodiments, the device includes a heat exchanger, the inlet flue of which is connected to the ammonia injection section and the outlet flue of which is connected to the outlet of the carbon monoxide reaction section, so that the flue gas to be treated enters the ammonia injection section through the heat exchanger and the purified flue gas is discharged through the heat exchanger.

[0009] In some specific embodiments, the device includes a heater located on the inlet flue that connects the heat exchanger and the ammonia injection section.

[0010] In some specific embodiments, the device includes an analysis and control unit, which includes a controller, an SCR denitrification outlet analyzer, and an ammonia removal outlet analyzer. The SCR denitrification outlet analyzer is located between the SCR denitrification reaction section and the ammonia removal reaction section, and is used to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section. The ammonia removal outlet analyzer is located between the ammonia removal reaction section and the carbon monoxide reaction section, and is used to monitor the ammonia concentration of the flue gas at the outlet of the ammonia removal reaction section. One end of the controller is connected to the SCR denitrification outlet analyzer and the ammonia removal outlet analyzer, and the other end is connected to the ammonia injection section, and is used to receive the monitoring data from the SCR denitrification outlet analyzer and the ammonia removal outlet analyzer and adjust the ammonia injection rate of the ammonia injection section according to the monitoring data.

[0011] In some specific embodiments, the ammonia injection unit includes an ammonia gas delivery pipe for introducing ammonia gas to mix with flue gas; the ammonia gas delivery pipe is equipped with a flow regulating valve; one end of the controller is connected to the flow regulating valve for controlling the valve opening to adjust the amount of ammonia injected by the ammonia injection unit.

[0012] In some specific embodiments, the SCR denitrification reaction section includes an N1 group of SCR denitrification catalysts spaced apart along the flue gas flow direction, where N1 ≥ 1.

[0013] In some specific embodiments, the deammoniation reaction section includes a group of N2 deammoniation catalysts spaced apart along the flue gas flow direction, where N2 ≥ 1.

[0014] In some specific embodiments, the carbon monoxide reaction section includes a group of N3 carbon monoxide catalysts spaced apart along the flue gas flow direction, where N3 ≥ 1.

[0015] The integrated sintering flue gas denitrification, deammoniation, and CO removal device provided by this invention operates as follows: The flue gas to be treated is transported to the ammonia injection section. Ammonia, the reducing agent required for the SCR denitrification reaction, is injected through the ammonia injection section and mixed with the flue gas. The mixture then enters the SCR denitrification reaction section for denitrification treatment. The resulting denitrified flue gas enters the deammoniation reaction section to remove unreacted ammonia. The deammoniation-removed flue gas then enters the carbon monoxide reaction section where a carbon monoxide catalyst removes carbon monoxide, thus forming purified flue gas which is then discharged. Compared to existing technologies, this invention sets up a deammoniation reaction section between the SCR denitrification reaction section and the carbon monoxide reaction section. This effectively prevents escaped ammonia from being emitted into the atmosphere with the flue gas, causing secondary pollution and affecting air quality. Furthermore, it reduces the impact of escaped ammonia on the subsequent carbon monoxide removal efficiency, which helps extend the lifespan of the carbon monoxide catalyst and improve carbon monoxide removal efficiency. This achieves the synergistic control of sintering flue gas denitrification, deammoniation, and CO removal.

[0016] In a preferred embodiment, the SCR denitrification reaction section, the deammoniation reaction section, and the carbon monoxide reaction section are arranged sequentially in the same reactor along the flue gas flow direction and are interconnected with each other, which is more conducive to reducing the floor space and saving investment costs.

[0017] In a preferred embodiment, the device includes an analysis and control unit, which comprises a controller, an SCR denitrification outlet analyzer, and an ammonia removal outlet analyzer. The analyzer is used to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section and the ammonia concentration of the flue gas at the outlet of the ammonia removal reaction section, and adjust the ammonia injection rate of the ammonia injection section based on the monitoring data. This helps to further improve the synergistic denitrification, ammonia removal, and CO removal efficiency of the device, achieve automated control, and save on operating costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the integrated device for denitrification, deammoniation and CO removal of sintering flue gas provided in one embodiment of the present invention.

[0019] Figure 2 This is a partial structural schematic diagram of an integrated device for denitrification, deammoniation, and CO removal of sintering flue gas provided in another embodiment of this utility model.

[0020] The attached diagram is labeled as follows: 100, inlet flue; 200, outlet flue; 300, ammonia injection section; 310, ammonia gas delivery pipeline; 320, flow regulating valve; 400, reactor; 410, SCR denitrification reaction section; 420, ammonia removal reaction section; 430, carbon monoxide reaction section; 440, reactor inlet flue; 500, heat exchanger; 600, heater; 700, analysis and control unit; 710, controller; 720, SCR denitrification outlet analyzer; 730, ammonia removal outlet analyzer; 410ˋ, SCR denitrification reactor; 420ˋ, ammonia removal reactor; 430ˋ, carbon monoxide reactor. Detailed Implementation

[0021] Although this disclosure can readily be embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is also understood that this specification should be regarded as an exemplary illustration of the principles of this disclosure and is not intended to limit the disclosure to what is described herein.

[0022] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of this disclosure, and does not imply that every embodiment of this disclosure must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0023] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this disclosure are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0024] Please see Figure 1 An embodiment of this utility model provides an integrated device for denitrification, ammonia removal, and CO removal of sintering flue gas, comprising: an ammonia injection section 300 and an SCR denitrification reaction section 410, an ammonia removal reaction section 420, and a carbon monoxide reaction section 430 connected sequentially along the flue gas flow direction. The ammonia injection section 300 is connected upstream of the SCR denitrification reaction section 410 along the flue gas flow direction, and is used to mix ammonia with the flue gas to be treated before entering the SCR denitrification reaction section 410; the ammonia removal section 420 is provided with an ammonia removal catalyst for removing ammonia from the flue gas; and the carbon monoxide reaction section 430 is provided with a carbon monoxide catalyst for removing carbon monoxide from the flue gas.

[0025] Through the above structural design, the flue gas to be treated is first conveyed to the ammonia injection section 300. The ammonia gas injected by the ammonia injection section 300 is mixed with the flue gas to be treated and then conveyed to the SCR denitrification reaction section 410 for denitrification treatment to reduce the NOx concentration in the flue gas. The denitrified flue gas enters the deammoniation reaction section 420 for deammoniation treatment to reduce the concentration of unreacted ammonia in the flue gas and reduce the impact of ammonia on the carbon monoxide catalyst in the subsequent carbon monoxide reaction section 430. This is beneficial to improving the carbon monoxide removal efficiency of the carbon monoxide reaction section 430 in the flue gas. The deammoniation-removed flue gas enters the carbon monoxide reaction section 430 to remove carbon monoxide. Finally, the purified flue gas after denitrification, deammoniation, and carbon monoxide removal is discharged, achieving the purpose of synergistic control of denitrification, deammoniation, and CO removal of sintering flue gas.

[0026] Furthermore, the SCR denitrification reaction unit 410, the ammonia removal reaction unit 420, and the carbon monoxide reaction unit 430 can be independent reactors, facilitating disassembly and flexible reaction control, or they can be integrated into the same reactor, which simplifies operation and saves space. Further, the SCR denitrification reaction unit 410, the ammonia removal reaction unit 420, and the carbon monoxide reaction unit 430 are sequentially arranged in the same reactor 400 along the flue gas flow direction. Integrating the SCR denitrification reaction unit 410, the ammonia removal reaction unit 420, and the carbon monoxide reaction unit 430 into the same reactor 400 saves space, simplifies operation, makes the device structure more compact, and the reaction more continuous, which is beneficial to further improve the efficiency of synergistic control of sintering flue gas denitrification, ammonia removal, and CO removal. On the other hand, it provides an improved approach for retrofitting the existing SCR denitrification reactor 400 into an integrated flue gas denitrification, ammonia removal, and CO removal reactor.

[0027] Furthermore, reactor 400 is connected to ammonia injection section 300 through reactor inlet flue 440, and purified flue gas that has undergone denitrification, deammoniation and CO removal is discharged from the outlet of reactor 400.

[0028] Furthermore, the device includes a heat exchanger 500, with its inlet flue 100 connected to the ammonia injection section 300 and its outlet flue 200 connected to the outlet of the carbon monoxide reaction section 430. This allows the flue gas to be treated to enter the ammonia injection section 300 through the heat exchanger 500, and the purified flue gas to be discharged through the heat exchanger 500. The flue gas to be treated first enters the heat exchanger 500 to exchange heat with the purified flue gas and be heated before entering the ammonia injection section 300. This allows for the full recovery and utilization of residual heat in the purified flue gas to raise the temperature of the flue gas to be treated, which is beneficial for energy conservation and reducing energy consumption and production costs.

[0029] Furthermore, the device includes a heater 600, which is located on the inlet flue 100 connecting the heat exchanger 500 and the ammonia injection section 300, for further heating the flue gas to be treated. Specifically, the heater 600 is connected to both the heat exchanger 500 and the ammonia injection section 300 via the inlet flue 100. The flue gas, after being heated by the heat exchanger 500, is then transported through the inlet flue 100 to the heater 600 for further heating, so that the flue gas reaches the processing temperature required for the subsequent SCR denitrification reaction. The further heated flue gas is then transported through the inlet flue 100 to the ammonia injection section 300.

[0030] Furthermore, the device includes an analysis and control unit 700, which includes a controller 710, an SCR denitrification outlet analyzer 720, and an ammonia removal outlet analyzer 730. The analysis and control unit 700 is used to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section 410 and the ammonia concentration of the flue gas at the outlet of the ammonia removal reaction section 420, and adjust the ammonia injection rate of the ammonia injection section 300 based on the monitoring data. The SCR denitrification outlet analyzer 720 is located between the SCR denitrification reaction section 410 and the deammoniation reaction section 420 to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section 410; the deammoniation outlet analyzer 730 is located between the deammoniation reaction section 420 and the carbon monoxide reaction section 430 to monitor the ammonia concentration of the flue gas at the outlet of the deammoniation reaction section 420; the controller 710 is connected at one end to the SCR denitrification outlet analyzer 720 and the deammoniation outlet analyzer 730 and at the other end to the ammonia injection section 300 to receive the monitoring data from the SCR denitrification outlet analyzer 720 and the deammoniation outlet analyzer 730 and adjust the ammonia injection rate of the ammonia injection section 300 according to the monitoring data.

[0031] Furthermore, the ammonia injection unit 300 includes an ammonia gas delivery pipe 310 for introducing ammonia gas to mix with flue gas. A flow regulating valve 320 is provided on the ammonia gas delivery pipe 310 to regulate the ammonia gas flow rate entering the ammonia injection unit 300, thereby regulating the amount of ammonia injected into the flue gas duct by the ammonia injection unit 300 to mix with the flue gas to be treated. One end of a controller 710 is connected to the flow regulating valve 320 to control the valve opening to adjust the ammonia injection amount of the ammonia injection unit 300.

[0032] Specifically, when the SCR denitrification outlet analyzer 720 detects a high NOx concentration in the flue gas at the outlet of the SCR denitrification reaction section 410, it may indicate that the ammonia injection volume of the ammonia injection section 300 is too small, resulting in insufficient denitrification reaction in the SCR denitrification reaction section 410. The analysis and control unit 700 receives the monitoring data and adjusts the opening of the flow regulating valve 320 appropriately based on the monitoring data to increase the ammonia injection volume of the ammonia injection section 300, thereby reducing the NOx concentration in the flue gas at the outlet of the SCR denitrification reaction section 410. When the ammonia concentration in the flue gas at the outlet of the ammonia removal reaction section 420 is high, it may indicate that the ammonia injection volume of the ammonia injection section 300 is too high, resulting in severe ammonia escape exceeding the standard, or even exceeding the processing capacity of the ammonia removal reaction section 420. The analysis and control unit 700 receives this monitoring data and adjusts the opening of the flow regulating valve 320 accordingly to reduce the ammonia injection volume of the ammonia injection section 300. During this adjustment process, it is also necessary to monitor the NOx concentration in the flue gas at the outlet of the SCR denitrification reaction section 410. While ensuring that the NOx concentration in the flue gas at the outlet of the SCR denitrification reaction section 410 meets the standard, the ammonia injection volume of the ammonia injection section 300 is reduced, thereby lowering the ammonia concentration in the flue gas at the outlet of the ammonia removal reaction section 420. This ensures that the subsequent carbon monoxide reaction section 430 has a high carbon monoxide catalyst removal efficiency.

[0033] Furthermore, the SCR denitrification reaction unit 410 includes N1 groups of SCR denitrification catalysts spaced apart along the flue gas flow direction, where N1 ≥ 1. This means the SCR denitrification catalysts can be arranged in a single layer or multiple layers, and the specific quantity can be selected based on the actual flue gas treatment capacity and device size. This invention does not impose any specific limitations on this quantity. The SCR denitrification catalysts can be any of the various options existing in the art.

[0034] Furthermore, the ammonia removal reaction section 420 includes ammonia removal catalysts arranged at intervals along the flue gas flow direction in groups of N2, where N2 ≥ 1. This means the ammonia removal catalysts can be arranged in single or multiple layers, and the specific quantity can be selected based on the actual flue gas treatment capacity and device size; this invention does not impose any specific limitations on this. The ammonia removal catalysts can be any of the various options existing in the art. The reaction principle of the ammonia removal catalyst in removing ammonia from flue gas is as follows: Under the catalytic action of the ammonia removal catalyst, ammonia reacts with oxygen in the flue gas to produce nitrogen and water. The reaction equation is 4NH3 + 3O2 = 2N2 + 6H2O.

[0035] Furthermore, the carbon monoxide reaction section 430 includes N3 groups of carbon monoxide catalysts spaced apart along the flue gas flow direction, where N3 ≥ 1. This means the carbon monoxide catalyst can be a single layer or multiple layers, and the specific number can be selected based on the actual flue gas treatment capacity and device size; this invention does not impose specific limitations on this. The carbon monoxide catalyst can be any of the existing options in the art, such as metal element catalysts, molecular sieve catalysts, etc. The reaction principle of the carbon monoxide catalyst in removing carbon monoxide from flue gas is as follows: Under the catalytic action of the carbon monoxide catalyst, carbon monoxide in the flue gas reacts with oxygen to produce carbon dioxide, and the reaction equation is 2CO + O2 = 2CO2.

[0036] The technical methods of the present invention will now be described and explained in detail and in complete detail with reference to the accompanying drawings of the embodiments of the present invention.

[0037] Example 1

[0038] This embodiment illustrates an integrated device for denitrification, ammonia removal, and CO removal of sintering flue gas, such as... Figure 1 As shown, it includes: inlet flue 100, outlet flue 200, ammonia injection section 300, reactor 400, heat exchanger 500, heater 600, and analysis and control unit 700.

[0039] In this embodiment, the heat exchanger 500 is connected to the inlet flue 100 and the outlet flue 200, respectively.

[0040] In this embodiment, the heater 600 is located on the inlet flue 100 that connects the heat exchanger 500 and the ammonia injection section 300.

[0041] In this embodiment, the ammonia injection unit 300 includes an ammonia gas delivery pipe 310, which is used to mix ammonia gas with the flue gas to be treated before entering the SCR denitrification reaction unit 410. The ammonia gas delivery pipe 310 is provided with a flow regulating valve 320, which is used to regulate the flow rate of ammonia gas entering the ammonia injection unit 300, thereby regulating the amount of ammonia injected into the flue gas duct by the ammonia injection unit 300 to mix with the flue gas to be treated.

[0042] In this embodiment, the SCR denitrification reaction unit 410, the ammonia removal reaction unit 420, and the carbon monoxide reaction unit 430 are sequentially arranged in the reactor 400 along the flue gas flow direction. The reactor 400 is connected to the ammonia injection unit 300 through the reactor inlet flue 440, and the gas outlet of the reactor 400 is connected to the outlet flue 200. The SCR denitrification reaction unit 410 includes three sets of SCR denitrification catalysts arranged at intervals along the flue gas flow direction. The SCR denitrification catalyst is the vanadium-titanium-based catalyst mentioned in Chinese patent document CN114642963B (this vanadium-titanium-based catalyst contains 72wt% TiO2, 2.45wt% MnO2, 10.67wt% V2O5, 7.77wt% CeO2, 2.35wt% Co2O3, and 4.34wt% glass fiber). The ammonia removal reaction unit 420 includes a group of ammonia removal catalysts spaced apart along the flue gas flow direction. The ammonia removal catalyst is an ammonia oxidation catalyst prepared according to the method of Example 1, CN115487820B. The carbon monoxide reaction unit 430 includes a group of carbon monoxide catalysts spaced apart along the flue gas flow direction. The carbon monoxide catalyst is a noble metal catalyst prepared according to the method of Example 1, CN114643065A.

[0043] In this embodiment, the analysis and control unit 700 includes a controller 710, an SCR denitrification outlet analyzer 720, and an ammonia removal outlet analyzer 730. It is used to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section 410 and the ammonia concentration of the flue gas at the outlet of the ammonia removal reaction section 420, and to adjust the ammonia injection rate of the ammonia injection section 300 based on the monitoring data. The SCR denitrification outlet analyzer 720 is located between the SCR denitrification reaction section 410 and the ammonia removal reaction section 420, and the ammonia removal outlet analyzer 730 is located between the ammonia removal reaction section 420 and the carbon monoxide reaction section 430. One end of the controller 710 is connected to the SCR denitrification outlet analyzer 720 and the ammonia removal outlet analyzer 730, and the other end is connected to the flow regulating valve 320 of the ammonia injection section 300. It is used to adjust the valve opening based on the monitoring data to regulate the ammonia injection rate of the ammonia injection section 300.

[0044] The device provided in this embodiment can handle an air volume of 1,000,000 Nm³. 3 / h (standard conditions) of industrial flue gas, of which NO in the flue gas X Concentration of 350 mg / Nm 3 (90% of the components are NO, the remainder is NO2), CO concentration is 8000 mg / Nm³. 3 The flue gas temperature is 280℃, and the ammonia injection rate during operation is 115 kg / h. Testing revealed that the NO content in the purified flue gas was... X The concentration is 45 mg / Nm 3 NO X The removal rate was 87.14%, and the NH3 concentration was 2.2 mg / Nm³. 3CO concentration is 3000 mg / Nm³ 3 The CO removal rate was 62.5%.

[0045] Example 2

[0046] This embodiment illustrates an integrated device for denitrification, ammonia removal, and CO removal of sintering flue gas. This device is identical to the one provided in Embodiment 1, except that the SCR denitrification reaction section 410, the ammonia removal reaction section 420, and the carbon monoxide reaction section 430 are each an independent SCR denitrification reactor 410ˋ, ammonia removal reactor 420ˋ, and carbon monoxide reactor 430ˋ arranged sequentially along the flue gas flow direction. Figure 2 As shown, the rest of the structure is the same as the device provided in Example 1.

[0047] The device provided in this embodiment can handle an air volume of 1,000,000 Nm³. 3 / h (standard conditions) of industrial flue gas, of which NO in the flue gas X Concentration of 350 mg / Nm 3 (90% of the components are NO, the remainder is NO2), CO concentration is 8000 mg / Nm³. 3 The flue gas temperature is 280℃, and the ammonia injection rate during operation is 115 kg / h. Testing revealed that the NO content in the purified flue gas was... X Concentration of 50 mg / Nm 3 NO X The removal rate was 85.71%, and the NH3 concentration was 2.4 mg / Nm³. 3 The CO concentration was 4000 mg / Nm³. 3 The CO removal rate is 50%.

[0048] When the integrated sintering flue gas denitrification, deammoniation and CO removal device provided in the above embodiments is running, the flue gas to be treated undergoes denitrification, deammoniation and CO removal treatment in sequence. At the same time, combined with the regulation of ammonia injection by the analysis and control unit 700, it is beneficial to improve the synergistic denitrification, deammoniation and CO removal efficiency of the device and save operating costs.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An integrated device for denitrification, ammonia removal, and CO removal of sintering flue gas, characterized in that, include: The system comprises an ammonia injection section and an SCR denitrification reaction section, an ammonia removal reaction section, and a carbon monoxide reaction section that are sequentially interconnected along the flue gas flow direction. The ammonia injection section is connected upstream of the SCR denitrification reaction section along the flue gas flow direction to allow ammonia to be mixed with the flue gas to be treated before entering the SCR denitrification reaction section. The ammonia removal section is equipped with an ammonia removal catalyst for removing ammonia from the flue gas. The carbon monoxide reaction section is equipped with a carbon monoxide catalyst for removing carbon monoxide from the flue gas.

2. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The SCR denitrification reaction section, the ammonia removal reaction section, and the carbon monoxide reaction section are sequentially arranged in the same reactor along the flue gas flow direction.

3. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 2, characterized in that, The reactor is connected to the ammonia injection section through the reactor inlet flue, and the purified flue gas is discharged from the reactor outlet.

4. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The device includes a heat exchanger, the inlet flue of which is connected to the ammonia injection section and the outlet flue of which is connected to the outlet of the carbon monoxide reaction section, so that the flue gas to be treated enters the ammonia injection section through the heat exchanger and the purified flue gas is discharged through the heat exchanger.

5. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 4, characterized in that, The device includes a heater located on the inlet flue connecting the heat exchanger and the ammonia injection section.

6. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The device includes an analysis and control unit, which includes a controller, an SCR denitrification outlet analyzer, and a deammoniation outlet analyzer. The SCR denitrification outlet analyzer is located between the SCR denitrification reaction section and the ammonia removal reaction section, and is used to monitor the NOx concentration of the flue gas at the outlet of the SCR denitrification reaction section; The ammonia removal outlet analyzer is located between the ammonia removal reaction section and the carbon monoxide reaction section, and is used to monitor the ammonia concentration in the flue gas at the outlet of the ammonia removal reaction section; The controller is connected at one end to the SCR denitrification outlet analyzer and the ammonia removal outlet analyzer, and at the other end to the ammonia injection unit. It is used to receive monitoring data from the SCR denitrification outlet analyzer and the ammonia removal outlet analyzer and adjust the ammonia injection volume of the ammonia injection unit according to the monitoring data.

7. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 6, characterized in that, The ammonia injection unit includes an ammonia gas delivery pipeline for introducing ammonia gas to mix with flue gas; a flow regulating valve is provided on the ammonia gas delivery pipeline; one end of the controller is connected to the flow regulating valve for controlling the valve opening to adjust the amount of ammonia injected by the ammonia injection unit.

8. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The SCR denitrification reaction section includes N1 groups of SCR denitrification catalysts spaced apart along the flue gas flow direction, where N1 ≥ 1.

9. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The deammoniation reaction section includes a group of N2 deammoniation catalysts spaced apart along the flue gas flow direction, where N2 ≥ 1.

10. The integrated device for denitrification, deammoniation, and CO removal of sintering flue gas according to claim 1, characterized in that, The carbon monoxide reaction section includes a group of N3 carbon monoxide catalysts spaced apart along the flue gas flow direction, where N3 ≥ 1.

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