An integrated desulfurization and denitrification equipment

Abstract

This application provides an integrated desulfurization and denitrification device for purifying flue gas, including a reaction bed (1) and a support frame (2) for supporting the reaction bed (1); the reaction bed (1) includes two reaction chambers (11) connected in series and an air inlet (12) and an air outlet (13) connected to the left and right sides of the two reaction chambers (11); a permeable but non-permeable sealing plate (111) is provided on the left and right sides of the two reaction chambers (11) and between them; each reaction chamber (11) has a reactant feeding port (112) on its top surface and a reactant unloading port (113) on its bottom surface. This device achieves integrated desulfurization and denitrification through a modular reaction bed, improving the uniform distribution of flue gas, reducing the floor space, and lowering costs. In addition, it can also achieve separate unloading of desulfurizing agent and denitrifying agent, and at the same time, it can make full use of the reactant and avoid waste of reactant.

Description

Technical Field

[0001] This invention relates to the field of desulfurization and denitrification technology, specifically to an integrated desulfurization and denitrification device. Background Technology

[0002] Flue gas from steel mills and gas-fired power plants contains large amounts of pollutants such as sulfur dioxide and nitrogen oxides, which need to be purified before being released into the atmosphere. Currently, steel mills and power plants mostly use fixed-bed calcium-based dry desulfurization technology to treat sulfur dioxide in their flue gas. This involves using calcium-based particulate desulfurizing agents to absorb sulfur dioxide and generate calcium sulfate. Similarly, fixed-bed dry denitrification technology is used to treat nitrogen oxides in the flue gas, where denitrifying agents absorb the nitrogen oxides.

[0003] However, current fixed-bed desulfurization and denitrification systems have the following problems: 1) The two systems are built separately, resulting in a large footprint, high investment costs, and high operating costs. 2) Uneven bed material distribution leads to poor flue gas flow field uniformity, resulting in uneven desulfurization and denitrification effects. 3) When the fixed bed performs desulfurization and denitrification simultaneously, both desulfurizing and denitrifying agents are placed inside. When replacing the reactants, both can only be replaced simultaneously, resulting in reactant waste and making it impossible to accurately control the replacement amount. 4) Due to differences in reaction rates and degrees of reaction at different locations, the utilization rate of the reactants also varies. During replacement, some reactants may not be fully utilized, leading to reactant waste and increased costs.

[0004] Therefore, developing combined or integrated removal of pollutants from flue gas is an inevitable trend. Given the physicochemical properties of sulfur dioxide and nitrogen oxides in flue gas, the ability to simultaneously and precisely control desulfurization and denitrification technologies has become the primary research direction for integrated removal. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention provides an integrated desulfurization and denitrification device.

[0006] The technical solution of this invention is as follows:

[0007] An integrated desulfurization and denitrification device for purifying flue gas includes a reaction bed and a support frame for supporting the reaction bed.

[0008] The reaction bed includes two reaction chambers that are attached to each other and arranged side to side, as well as an air inlet and an air outlet connecting the left and right sides of the two reaction chambers.

[0009] The two reaction chambers are equipped with air-permeable but material-permeable sealing plates on both sides and between them. Each reaction chamber has a reactant feeding port on the top surface and a reactant unloading port on the bottom surface.

[0010] In operation, the two reaction chambers are filled with desulfurizing agent and denitrifying agent, respectively. Flue gas is introduced through the inlet and passes horizontally through the two reaction chambers in sequence, where it reacts chemically with the desulfurizing and denitrifying agents to remove sulfur dioxide and nitrogen oxides from the flue gas. The flue gas is then discharged through the outlet, achieving integrated removal of sulfur dioxide and nitrogen oxides from the flue gas and saving costs.

[0011] As an optimized design, each reaction chamber is divided into a first reaction chamber and a second reaction chamber by a scissor-shaped, cross-shaped partition. The upper parts of the first and second reaction chambers are connected to the reactant inlet, and the lower parts cross and are connected to the reactant outlet. The upper part of the first reaction chamber is closer to the air inlet, and the upper part of the second reaction chamber is closer to the air outlet. The reaction chamber closer to the air inlet is connected to a gas distribution plate at the corresponding cross-point.

[0012] After the flue gas comes into contact with the gas distribution plate, it is divided into upper and lower parts. The flue gas in the upper part of the gas distribution plate passes through the first reaction chamber and the second reaction chamber in turn, while the flue gas in the lower part passes through the second reaction chamber and the first reaction chamber in turn.

[0013] Since the reactant that reacts with the flue gas first will be used to a greater extent in the purification process than the reactant that reacts with the flue gas later, the two reaction chambers are scissor-crossed. This allows the reactants in the reaction chambers to exchange positions with the flue gas by unloading, thus achieving uniform and full utilization of the reactants.

[0014] Specifically, the first reaction chamber includes a first upper reaction chamber located at the upper left, a first lower reaction chamber located at the lower right, and a first discharge channel connecting the two.

[0015] The second reaction chamber includes a second upper reaction chamber located at the upper right, a second lower reaction chamber located at the lower left, and a second discharge channel connecting the two.

[0016] To ensure that the reactant discharged each time is fully utilized and controlled, the volumes of the first upper reaction chamber and the first lower reaction chamber are set to be the same, and the volumes of the second upper reaction chamber and the second lower reaction chamber are also set to be the same. This ensures that the amount of reactant in the upper reaction chamber is the same as that in the lower reaction chamber, so that the amount of unused reactant in the reaction chamber is in the lower reaction chamber each time, and the amount of unused reactant is half the capacity of the reaction chamber. Each time, only the unused reactant in the lower reaction chamber needs to be discharged, so that all the partially used reactant in the upper reaction chamber falls into the lower reaction chamber. The upper reaction chamber is then filled with new reactant, and the flue gas purification operation can be carried out again.

[0017] It is understandable that the new reactant reacts with sulfur dioxide or nitrogen oxides in the flue gas at a faster rate and has a stronger ability to purify the flue gas, thus making the air intake at the top of the gas distribution plate greater than that at the bottom.

[0018] Specifically, the air distribution plate is a flat plate with its front and rear edges connected to the front and rear side walls of the air inlet. Its right edge is connected to the sealing plate on the left side of the reaction chamber, and its left edge extends towards the air inlet of the air inlet, with a distance ratio of 6-7:3-4 between its left and right edges and the upper and lower side walls of the air inlet.

[0019] To prevent flue gas from flowing into the second upper reaction chamber without passing through the first upper reaction chamber, and into the first lower reaction chamber without passing through the second lower reaction chamber, the front and rear of the first upper reaction chamber, the first lower reaction chamber, the second upper reaction chamber, and the second lower reaction chamber extend to the front and rear ends of the reaction chamber, respectively. That is, the first upper reaction chamber and the second upper reaction chamber, as well as the second lower reaction chamber and the first lower reaction chamber, are in a left-right blocking relationship.

[0020] In addition, the first and second discharge channels are arranged side by side in the middle of the reaction chamber, and both of them have sloping surfaces in the left and right directions on the top and bottom, so that the reactant in the upper reaction chamber falls more smoothly and the two upper reaction chambers can be emptied at the same time.

[0021] The first and second discharge channels are separated by a diamond-shaped central partition, located at the center of the reaction chamber. Its left and right corners connect to the left and right sides of the chamber. The top and bottom surfaces of the first and second discharge channels are connected to the four inclined edges of the central partition. This diamond-shaped partition not only provides structural support for the top and bottom surfaces of the first and second discharge channels but also strengthens the internal structure of the reaction chamber, resulting in greater overall structural strength.

[0022] The right edge of the air distribution panel is flush with the left corner of the middle partition.

[0023] In addition, to avoid reactant residue in the upper reaction chamber, the bottom surface of the reaction chamber located above the discharge channel is inclined upward on the side away from the middle partition. That is, the bottom surface of the first upper reaction chamber located above the second discharge channel extends downward towards the opening of the first discharge channel and is connected to the middle partition, and the bottom surface of the second upper reaction chamber located above the first discharge channel extends downward towards the opening of the second discharge channel and is connected to the middle partition.

[0024] In operation, the integrated desulfurization and denitrification equipment of this application, after the flue gas enters the inlet duct, most of it flows from the upper part of the gas distribution plate to the first upper reaction chamber, passing through the first upper reaction chamber first, and then the second upper reaction chamber. During the purification process, the degree of reactant utilization in the first upper reaction chamber is greater than that in the second upper reaction chamber. A small portion of the flue gas flows from the lower part of the gas distribution plate to the second lower reaction chamber, passing through the second lower reaction chamber first, and then the first lower reaction chamber. During the purification process, the degree of reactant utilization in the second lower reaction chamber is greater than that in the first lower reaction chamber.

[0025] By unloading the reactants from the two lower reaction chambers, the reactants with relatively lower usage levels from the second upper reaction chamber fall into the second lower reaction chamber, while the reactants with relatively higher usage levels from the first upper reaction chamber fall into the first lower reaction chamber. In this way, during the next purification, the reactants with relatively lower usage levels can react chemically with the flue gas first, thus achieving the required purification while ensuring that the reactants are fully utilized.

[0026] In this application, a pre-storage chamber for the reactant is provided above the reactant feeding port. When the reactant settles during the purification of flue gas, it promptly fills the empty space above, preventing the flue gas from passing directly through the space without reacting with the reactant, thus affecting the purification results.

[0027] A discharge airlock assembly is provided below the reactant discharge port to discharge the reactant and control the discharge amount.

[0028] This invention provides an integrated desulfurization and denitrification device with a modular reaction bed, achieving integrated desulfurization and denitrification. This improves the uniformity of flue gas distribution while reducing the footprint and lowering investment and operating costs. Furthermore, the desulfurizing and denitrification agents are placed separately and can be replaced independently, avoiding waste of reactants. Simultaneously, by changing the sequence of contact between reactants of different utilization rates and the flue gas, the reactants are fully utilized, preventing waste and saving costs. Attached Figure Description

[0029] In the attached diagram:

[0030] Figure 1 This is a schematic diagram of an integrated desulfurization and denitrification equipment;

[0031] Figure 2 This is a schematic diagram of the integrated desulfurization and denitrification equipment.

[0032] Figure 3 This is a schematic diagram of the reaction chamber;

[0033] Figure 4 This is a schematic diagram of the first and second reaction chambers;

[0034] Figure 5 This is a schematic diagram of the flue gas desulfurization and denitrification process.

[0035] The components represented by the various reference numerals in the diagram are:

[0036] 1. Reaction bed; 11. Reaction chamber; 111. Sealing plate; 112. Reactant feeding port; 113. Reactant discharge port; 114. Partition; 1141. Intermediate partition; 115. First reaction chamber; 1151. First upper reaction chamber; 1152. First lower reaction chamber; 1153. First discharge channel; 116. Second reaction chamber; 1161. Second upper reaction chamber; 1162. Second lower reaction chamber; 1163. Second discharge channel; 12. Air inlet; 121. Flue gas inlet; 13. Air outlet; 131. Flue gas outlet; 14. Reactant pre-storage chamber; 15. Discharge airlock assembly; 151. Discharge hopper; 152. Discharge airlock device; 16. Gas distribution plate; 17. Uniform distribution plate; 2. Support. Detailed Implementation

[0037] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides an integrated desulfurization and denitrification device for purifying sulfides and nitrogen oxides carried in flue gas, which includes a reaction bed 1 and a support 2 for supporting the reaction bed 1.

[0038] The reaction bed 1 includes two reaction chambers 11 that are attached to each other and arranged side to side, as well as an air inlet 12 and an air outlet 13 connected to the left and right sides of the two reaction chambers 11.

[0039] The two reaction chambers 11 are fitted with air-permeable but material-permeable sealing plates 111 on both sides and between them. This allows the reaction chambers 11 to be filled with reactants, but the reactants cannot fall out of the sealing plates 111, while the flue gas can pass through each sealing plate 111. The sealing plates 111 can be perforated plates or small-mesh metal mesh, etc.

[0040] Each reaction chamber 11 has a reactant inlet 112 on its top surface. Above the reactant inlet 112 is a reactant pre-storage chamber 14, which stores reactant. When the reactant settles during flue gas purification, it promptly fills the empty space above, preventing flue gas from passing directly through the space without reacting with the reactant, thus affecting the purification results. It also serves to seal the top surface of the reaction chamber 11.

[0041] Each reaction chamber 11 has a reactant discharge port 113 on its bottom surface. Below the reactant discharge port 113 is a discharge airlock assembly 15, which is used to discharge the reactant in the reaction chamber 11 and control the discharge amount. At the same time, it can also seal the bottom surface of the reaction chamber 11, so that the flue gas can only flow from the inlet duct 12 to the outlet duct 13.

[0042] The unloading airlock assembly 15 includes an unloading hopper 151 and an unloading airlock device 152.

[0043] The discharge hopper 151 is an inverted cone shape. Its upper end is connected to the bottom surface of the reaction chamber 11, and its opening completely covers the reactant discharge port 113. Its lower end is connected to the discharge airlock device 152. The discharge airlock device 152 can be any type of airlock ash discharge machine currently available on the market.

[0044] In use, desulfurizing agent and denitrifying agent are respectively fed into the two reaction chambers 11 through the reactant feeding port 112. Flue gas is introduced through the inlet duct 12 and passes horizontally through the two reaction chambers 11 in sequence, where it reacts chemically with the desulfurizing agent and denitrifying agent to remove sulfur dioxide and nitrogen oxides from the flue gas. Then it is discharged from the outlet duct 13, realizing the integrated removal of sulfur dioxide and nitrogen oxides from the flue gas and saving costs.

[0045] For example Figures 2-4 As shown, each reaction chamber 11 is divided into a first reaction chamber 115 and a second reaction chamber 116 by a scissor-shaped cross-shaped partition 114. The first reaction chamber 115 and the second reaction chamber 116 preferably have the same shape.

[0046] The upper parts of the first reaction chamber 115 and the second reaction chamber 116 are respectively connected to the reactant feeding port 112, and the lower parts are connected to the reactant discharge port 113 after crossing. The upper part of the first reaction chamber 115 is close to the air inlet 12, and the upper part of the second reaction chamber 116 is close to the air outlet 13. The reaction chamber 11 on the side close to the air inlet 12 is connected to the gas distribution plate 16 at the corresponding intersection point.

[0047] After the flue gas comes into contact with the gas distribution plate 16, it is divided into upper and lower parts. The flue gas in the upper part of the gas distribution plate 16 passes through the first reaction chamber 115 and the second reaction chamber 116 in turn, while the flue gas in the lower part passes through the second reaction chamber 116 and the first reaction chamber 115 in turn.

[0048] Since the reactant that reacts with the flue gas first will be used to a greater extent in the purification process than the reactant that reacts with the flue gas later, the two reaction chambers are scissor-crossed. This allows the reactants in the reaction chambers to exchange positions with the flue gas by unloading, thus achieving uniform and full utilization of the reactants.

[0049] Specifically, the first reaction chamber 115 includes a first upper reaction chamber 1151 located at the upper left, a first lower reaction chamber 1152 located at the lower right, and a first discharge channel 1153 connecting the two.

[0050] The second reaction chamber 116 includes a second upper reaction chamber 1161 located on the upper right, a second lower reaction chamber 1162 located on the lower left, and a second discharge channel 1163 connecting the two.

[0051] To ensure that the reactant discharged each time is fully utilized and controlled, the volumes of the first upper reaction chamber 1151 and the first lower reaction chamber 1152 are set to be the same, and the volumes of the second upper reaction chamber 1161 and the second lower reaction chamber 1162 are also set to be the same. This ensures that the amount of reactant in the upper reaction chamber is the same as that in the lower reaction chamber, so that the unused reactant in the reaction chamber is placed in the lower reaction chamber each time, and the amount of unused reactant is half the capacity of the reaction chamber. Each time, only the unused reactant in the lower reaction chamber needs to be discharged, so that all the partially used reactant in the upper reaction chamber falls into the lower reaction chamber. New reactant is then added to the upper reaction chamber, and the flue gas purification operation can be carried out again.

[0052] It is understandable that the new reactant reacts with sulfur dioxide or nitrogen oxides in the flue gas at a faster rate and has a stronger ability to purify the flue gas. Therefore, the flue gas is divided unevenly by the gas distribution plate 16, so that the air intake at the top of the gas distribution plate 16 is greater than the air intake at the bottom.

[0053] Specifically, the gas distribution plate 16 is a flat plate with its front and rear edges connected to the front and rear side walls of the air inlet 12, its right edge connected to the sealing plate 111 on the left side of the reaction chamber 11, and its left edge extending towards the air inlet of the air inlet 12 with a distance ratio of 6-7:3-4 to the upper and lower side walls of the air inlet 12, so that both the new and old reactants can play a purification role.

[0054] The gas distribution plate 16 is connected to the side of the reaction chamber 11 at the connection end between the first upper reaction chamber 1151 and the second lower reaction chamber 1162. In this way, although the purification effect of the reactant in the two lower reaction chambers is reduced, because less flue gas enters, the unit flue gas can come into contact with more reactant to react, so the required purification effect can still be achieved. At the same time, the reactant can be fully utilized until it is completely ineffective.

[0055] To prevent flue gas from flowing into the second upper reaction chamber 1161 without passing through the first upper reaction chamber 1151, and into the first lower reaction chamber 1152 without passing through the second lower reaction chamber 1162, the front and rear of the first upper reaction chamber 1151, the first lower reaction chamber 1152, the second upper reaction chamber 1161, and the second lower reaction chamber 1162 extend to the front and rear ends of the reaction chamber 11, respectively. That is, the first upper reaction chamber 1151 and the second upper reaction chamber 1161, as well as the second lower reaction chamber 1162 and the first lower reaction chamber 1152, are in a left-right blocking relationship.

[0056] In addition, the first discharge channel 1153 and the second discharge channel 1163 are arranged side by side in the middle of the reaction chamber 11, and both of them have inclined surfaces in the left and right directions on the top and bottom, so that the reactant in the upper reaction chamber falls more smoothly and the two upper reaction chambers can be emptied at the same time.

[0057] The first discharge channel 1153 and the second discharge channel 1163 are separated by a rhomboid partition 1141. The partition 1141 is located at the center of the reaction chamber 11, and its left and right rhomboid corners connect to the left and right sides of the reaction chamber 11. The top and bottom surfaces of the first discharge channel 1153 and the second discharge channel 1163 are respectively connected to the four inclined sides of the partition 1141. The rhomboid partition 1141 not only provides structural support for the top and bottom surfaces of the first discharge channel 1153 and the second discharge channel 1163, but also strengthens the internal structure of the reaction chamber 11, making the overall structure of the reaction chamber 11 stronger.

[0058] The right edge of the air distribution plate 16 is flush with the left corner of the middle partition plate 1141.

[0059] In addition, to avoid reactant residue in the upper reaction chamber, the bottom surface of the reaction chamber above the discharge channel is inclined upward away from the middle partition 1141. That is, the bottom surface of the first upper reaction chamber 1151 above the second discharge channel 1163 extends downward towards the opening of the first discharge channel 1153 and is connected to the middle partition 1141. The bottom surface of the second upper reaction chamber 1161 above the first discharge channel 1153 extends downward towards the opening of the second discharge channel 1163 and is connected to the middle partition 1141.

[0060] In operation, the integrated desulfurization and denitrification equipment of this application, after the flue gas enters the inlet duct 12, most of it flows from the upper part of the gas distribution plate 16 to the first upper reaction chamber 1151, passing through the first upper reaction chamber 1151 first, and then through the second upper reaction chamber 1161. During the purification process, the utilization rate of the reactant in the first upper reaction chamber 1151 is greater than that in the second upper reaction chamber 1161. A small portion of the flue gas flows from the lower part of the gas distribution plate 16 to the second lower reaction chamber 1162, passing through the second lower reaction chamber 1162 first, and then through the first lower reaction chamber 1152. During the purification process, the utilization rate of the reactant in the second lower reaction chamber 1162 is greater than that in the first lower reaction chamber 1152.

[0061] By unloading the reactants from the two lower reaction chambers, the reactants with relatively lower usage in the second upper reaction chamber 1161 fall into the second lower reaction chamber 1162, and the reactants with relatively higher usage in the first upper reaction chamber 1151 fall into the first lower reaction chamber 1152. In this way, during the next purification, the reactants with relatively lower usage can react chemically with the flue gas first, so that the required purification requirements are met while the reactants are fully utilized.

[0062] In this application, the inlet duct 12 and the outlet duct 13 extend from the side of the reaction chamber 11 in a gradually narrowing cross-section away from the reaction chamber 11. Because the cross-section of the inlet duct 12 gradually widens along the flue gas flow direction, the flue gas diffuses outwards after entering the inlet duct 12, slowing down the gas flow velocity. This facilitates the uniform distribution of flue gas within the inlet duct 12 and also prevents the flue gas from eroding the sidewalls of the reaction chamber 11. Conversely, during exhaust, the cross-section of the outlet duct 13 gradually decreases, and the flue gas flow velocity gradually increases, which is beneficial for flue gas removal.

[0063] In this embodiment, the air inlet 12 and the air outlet 13 are preferably the same shape and are symmetrically arranged on both sides of the reaction chamber 11.

[0064] At the protruding ends of the air inlet duct 12 and the air outlet duct 13, that is, at the ends away from the reaction chamber 11, there are respectively a flue gas inlet 121 and a flue gas outlet 131. The flue gas inlet 121 and the flue gas outlet 131 are located at the center of the air inlet duct 12 and the air outlet duct 13, which is conducive to the uniform diffusion of flue gas in the air inlet duct 12.

[0065] In order to achieve a more rapid and uniform distribution of the flue gas, so that the gas distribution plate 16 can accurately divide the flue gas, a uniform distribution plate 17 can also be set between the flue gas inlet 121 and the gas distribution plate 16 in the air inlet duct 12. The uniform distribution plate 17 is parallel to the side of the reaction chamber 11, and the uniform distribution plate 17 is evenly provided with air vents.

[0066] In addition, to increase the overall structural strength of the reaction bed 1 and improve its service life, a support structure (not shown in the figure) is provided around the perimeter of the reaction chamber 11. Preferably, in this embodiment, the sealing plate 111 can be detachably connected to the support structure so that the reaction chamber 11 can be cleaned when not in use.

[0067] like Figure 5 The diagram illustrates the specific usage process of the integrated desulfurization and denitrification equipment provided in this application. Since the usage process of each reaction chamber 11 is the same, the following explanation will only use one reaction chamber 11 as an example:

[0068] S1: Prepare materials in advance.

[0069] Reactant is added to the two reaction chambers through the reactant inlet 112 until they are full, and sufficient reactant is left in the reactant pre-storage chamber 14.

[0070] At this point, all the reactants in each reaction chamber 11 are new reactants, and a predetermined amount of flue gas is introduced to react chemically with the reactants. The degree of reactant utilization in the first upper reaction chamber 1151 after the reaction will be greater than that in the second upper reaction chamber 1161. Similarly, the degree of reactant utilization in the second lower reaction chamber 1162 will be greater than that in the first lower reaction chamber 1152.

[0071] S2: Open the unloading airlock device 152 to unload the reactants in the second lower reaction chamber 1162 and the first lower reaction chamber 1152.

[0072] The discharged reactant is partially used and can be used as a pre-filler for another integrated desulfurization and denitrification device, thus eliminating the need for steps S1 and S2 in that device.

[0073] After unloading, the reactant in the first upper reaction chamber 1151 falls into the first lower reaction chamber 1152, and the reactant in the second upper reaction chamber 1161 falls into the second lower reaction chamber 1162. At this time, the degree of reactant utilization in the second lower reaction chamber 1162 is less than the degree of reactant utilization in the first lower reaction chamber 1152.

[0074] S3: New reactants are refilled into the first upper reaction chamber 1151 and the second upper reaction chamber 1161.

[0075] S4: Introduce flue gas.

[0076] The flue gas enters the intake duct 12 and is evenly distributed by the distribution plate 17, and then separated by the gas distribution plate 16, so that more flue gas flows to the first upper reaction chamber 1151 and less flue gas flows to the second lower reaction chamber 1162. For example, the gas distribution plate 16 divides the flue gas into 60-70% flowing to the first upper reaction chamber 1151 and 30-40% flowing to the second lower reaction chamber 1162.

[0077] As mentioned earlier, the reactant closer to the intake side is used to a greater extent during the reaction than the reactant farther from the intake side. Therefore, the reactant in the second lower reaction chamber 1162 will gradually become the same as the reactant in the first lower reaction chamber 1152, reaching simultaneous failure. At this time, the reactants in the first upper reaction chamber 1151 and the second upper reaction chamber 1161 are partially used, with the reactant in the first upper reaction chamber 1151 being used to a greater extent than the reactant in the second upper reaction chamber 1161.

[0078] S5: Stop the flue gas supply, open the unloading airlock device 152, and unload the failed reactant from the second lower reaction chamber 1162 and the first lower reaction chamber 1152.

[0079] At this time, the reactant in the first upper reaction chamber 1151 falls into the first lower reaction chamber 1152, and all the reactant in the second upper reaction chamber 1161 falls into the second lower reaction chamber 1162.

[0080] Repeat steps S3-S5 until the flue gas is completely purified.

[0081] Although the two reaction chambers 11 in the integrated desulfurization and denitrification equipment of this application have the same usage process, they are filled with different reactants. One is filled with desulfurizing agent and the other is filled with denitrifying agent. The chemical reaction rates of the two reactants are different, and the degree of use of the reactants is also different. Therefore, in actual use, unloading and filling can be carried out separately according to the specific usage of the reactants, thus avoiding the problem of reactant waste when unloading mixed.

[0082] As described above, the integrated desulfurization and denitrification equipment provided by this invention features a modular reaction bed 1, achieving integrated desulfurization and denitrification. This improves the uniformity of flue gas distribution while reducing the footprint and lowering investment and operating costs. Furthermore, the desulfurizing and denitrification agents are placed separately and can be replaced individually, avoiding waste of reactants. Simultaneously, by changing the sequence of contact between reactants of different utilization levels and the flue gas, the reactants are fully utilized, preventing waste and saving costs.

[0083] In addition, the integrated desulfurization and denitrification equipment provided in this application can be connected in parallel in actual use. When one is unloading, the flue gas is introduced into another device to achieve the continuity of flue gas treatment and increase the amount of flue gas that can be treated.

Claims

1. A desulfurization and denitration integrated apparatus for purifying flue gas, characterized by, The reaction bed (1) and the support (2) supporting the reaction bed (1); The reaction bed (1) comprises two reaction chambers (11) arranged left and right and abutting each other, and gas inlet channels (12) and gas outlet channels (13) connected to the left and right sides of the two reaction chambers (11); The left and right sides and the space between the two reaction chambers (11) are provided with material sealing plates (111) that are air permeable but not material permeable; The top surface of each reaction chamber (11) is provided with a reaction agent feeding port (112), and the bottom surface is provided with a reaction agent discharging port (113); Each reaction chamber (11) is divided into a first reaction chamber (115) and a second reaction chamber (116) arranged in a scissors cross by an air-permeable and material-impermeable partition (114), the upper parts of the first reaction chamber (115) and the second reaction chamber (116) are connected to the reaction agent feeding port (112) respectively, the lower parts are connected to the reaction agent discharging port (113) after being crossed respectively, the upper part of the first reaction chamber (115) is close to the side of the gas inlet channel (12), the upper part of the second reaction chamber (116) is close to the side of the gas outlet channel (13), and the reaction chamber (11) close to the side of the gas inlet channel (12) is connected with a gas distribution plate (16) at the corresponding cross point position; The flue gas on the upper part of the gas distribution plate (16) passes through the first reaction chamber (115) and the second reaction chamber (116) in sequence, and the flue gas on the lower part passes through the second reaction chamber (116) and the first reaction chamber (115) in sequence; The first reaction chamber (115) comprises a first upper reaction chamber (1151) located at the upper left, a first lower reaction chamber (1152) located at the lower right, and a first discharging channel (1153) connecting the two; The second reaction chamber (116) comprises a second upper reaction chamber (1161) located at the upper right, a second lower reaction chamber (1162) located at the lower left, and a second discharging channel (1163) connecting the two; The volumes of the first upper reaction chamber (1151) and the first lower reaction chamber (1152) are the same, and the volumes of the second upper reaction chamber (1161) and the second lower reaction chamber (1162) are the same; The gas inlet amount of the upper part of the gas distribution plate (16) is greater than that of the lower part; The first discharging channel (1153) and the second discharging channel (1163) are arranged in parallel at the front and back of the middle position of the reaction chamber (11), and the upper and lower surfaces of the two are inclined surfaces in the left-right direction; The first discharging channel (1153) and the second discharging channel (1163) are separated by a rhombus-shaped middle partition (1141), which is located at the center of the reaction chamber (11) and has its left and right rhombic corners connected to the left and right sides of the reaction chamber (11), and the upper and lower surfaces of the first discharging channel (1153) and the second discharging channel (1163) are connected to the four inclined edges of the middle partition (1141) respectively.

2. The desulfurization and denitration integrated apparatus according to claim 1, wherein The front and back surfaces of the first upper reaction chamber (1151), the first lower reaction chamber (1152), the second upper reaction chamber (1161), and the second lower reaction chamber (1162) extend to the front and back ends of the reaction chamber (11) respectively.

3. The desulfurization and denitration integrated apparatus according to claim 1, wherein The bottom surface of the first upper reaction chamber (1151) above the second lower feeding channel (1163) is inclined upward away from one side of the intermediate partition plate (1141); The bottom surface of the second upper reaction chamber (1161) above the first lower feeding channel (1153) is inclined upward away from one side of the intermediate partition plate (1141).

4. The desulfurization and denitration integrated apparatus according to claim 1, wherein The gas distribution plate (16) is a flat plate, the front and back edges of which are connected with the front and back side walls of the gas inlet channel (12), the right edge of which is connected with the left sealing plate (111) of the reaction chamber (11) and is flush with the left rhombus of the intermediate partition plate (1141), and the left edge of which extends to the gas inlet of the gas inlet channel (12).

5. The desulfurization and denitration integrated apparatus according to claim 4, wherein The distance ratio between the left edge of the gas distribution plate (16) and the upper and lower side walls of the gas inlet channel (12) is 6-7:4 or 7:3-4.

6. The desulfurization and denitration integrated apparatus according to claim 1, wherein A reaction agent pre-storage cavity (14) is arranged above the reaction agent feeding port (112), and a discharging gas locking assembly (15) is arranged below the reaction agent discharging port (113).

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