Tunnel blasting excavation flue gas desulfurization and denitrification all-in-one machine

Abstract

The invention relates to the technical field of flue gas desulfurization and denitrification, in particular to a flue gas desulfurization and denitrification all-in-one machine for tunnel blasting excavation. The plurality of first fixed shells are arranged in the tank body; the gas guide pipe is rotationally arranged on the tank body; the second fixing shells are all arranged on the gas guide pipe, solid catalytic absorbents are stored in the second fixing shells, and the solid catalytic absorbents are composed of nanoscale high-activity calcium hydroxide, catalysts and special auxiliaries; and the third fixing shell is fixedly connected to the tank body, and a vent hole is formed in the third fixing shell. According to the invention, the solid catalytic absorbent composed of nano-scale high-activity calcium hydroxide, the catalyst and the special auxiliary agent is arranged, so that flue gas can be conveniently subjected to desulfurization and denitrification treatment in a tunnel in a normal temperature state, and the problem of tunnel heat accumulation caused by high-temperature operation of traditional equipment is effectively avoided; the thermal comfort and the safety of a construction environment are obviously improved, and meanwhile, the energy consumption and the cooling requirement are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization and denitrification, and in particular to an integrated machine for flue gas desulfurization and denitrification used in tunnel blasting and excavation. Background Art

[0002] During the tunnel blasting and excavation process, the explosion of explosives will produce a large amount of sulfur dioxide (SO2), nitrogen oxides (NO X ) and other harmful gases seriously endanger the health of workers and pollute the construction environment. Therefore, efficient flue gas purification equipment is required for desulfurization and denitrification. Currently, most flue gas desulfurization and denitrification systems draw on industrial boiler or power plant emission control technologies, generally using processes such as selective catalytic reduction (SCR) or wet / semi-dry chemical absorption. These core treatment units typically require relatively high temperatures (usually 150°C to 400°C) to maintain catalyst activity and reaction efficiency.

[0003] However, when this type of high-temperature treatment equipment is used in the special environment of narrow, closed tunnels with poor ventilation and heat dissipation conditions, it exposes significant defects: the heat generated during the operation of the equipment itself is difficult to dissipate in a timely manner. In addition, the superposition of residual heat from blasting and heat sources from mechanical operations causes the ambient temperature in the tunnel to continue to rise. Excessively high ambient temperatures not only affect the working comfort and safety of construction workers, but can also easily lead to health risks such as heatstroke and fatigue. It can also accelerate the aging of electrical equipment, reduce the stability of control systems, and even induce a decrease in the efficiency of the ventilation system, forming a vicious cycle. In addition, increasing ventilation dilution to reduce the temperature will cause the spread of pollutants to expand, which in turn reduces the capture and treatment efficiency of purification equipment and weakens the overall treatment effect. Summary of the Invention

[0004] In order to overcome the problems in the above-mentioned background technology, the present invention provides an integrated desulfurization and denitrification machine for flue gas from tunnel blasting and excavation.

[0005] The technical solution is: a tunnel blasting excavation flue gas desulfurization and denitrification integrated machine, including: A tank body, wherein the tank body is provided with a gas injection port and an exhaust port; a plurality of first fixed shells, each disposed in the tank body, and all of the first fixed shells are located between the gas injection port and the gas exhaust port; an air guide pipe, rotatably arranged on the tank body; a plurality of second fixed shells, each disposed on the air duct, the number of the second fixed shells being the same as the number of the first fixed shells, the second fixed shells storing a solid catalytic absorber, the solid catalytic absorber comprising nano-scale highly active calcium hydroxide, a catalyst, and a special additive, the solid catalytic absorber being used to remove sulfur dioxide and nitrogen oxides from flue gas at room temperature; The third fixing shell is fixedly connected to the bottom of the tank body, and the third fixing shell is provided with a vent hole.

[0006] More preferably, the plurality of first fixed shells and the plurality of second fixed shells are staggeredly distributed, and the first fixed shells are used to delay the rising of smoke.

[0007] More preferably, the air guide pipe is fixedly connected to a plurality of circular tubes, the circular tubes are provided with exhaust holes, and one-way valves are installed in the exhaust holes of the circular tubes. The circular tubes are used to inject oxygen into the solid catalytic absorbent.

[0008] More preferably, the tank body is fixedly connected to a drive motor, and the output shaft of the drive motor is transmitted to the air duct via a gear set, and the drive motor is used to drive the air duct and the circular tube to rotate.

[0009] More preferably, it further comprises: A first electric push rod is fixedly connected to the tank body; a sleeve fixedly connected to the telescopic end of the first electric push rod, the sleeve being sleeved on the outside of the air duct, the tank body and the third fixed shell being slidably connected to the sleeve, and the sleeve being fixedly connected to the adjacent second fixed shell; a plurality of first connecting rods, each fixedly connected between two adjacent second fixed shells, wherein the first connecting rods penetrate adjacent first fixed shells and are slidably connected thereto, and the second fixed shells are slidably connected to the air guide tubes, and all the first connecting rods are used together to synchronously move all the second fixed shells; Multiple fixed plates are fixedly connected to the air duct, the number of the fixed plates is the same as the number of the second fixed shells, the fixed plates are slidingly connected to the adjacent second fixed shells, the tank body is provided with a filling port for installing a switch valve, and the third fixed shell is provided with a discharge port for installing a switch valve.

[0010] More preferably, the fixing plate is provided with a frustum surface for reducing the residue of the solid catalytic absorbent.

[0011] More preferably, the third fixed shell is fixed with a spiral plate, and the spiral plate is used to guide the gas to rotate.

[0012] More preferably, the air guide tube is fixedly connected to a plurality of stirring racks, the number of the stirring racks is the same as the number of the first fixed shells, and the stirring racks are located in adjacent first fixed shells.

[0013] More preferably, the air guide pipe is fixedly connected to an impeller, the second fixed shell close to the impeller is fixedly connected to a fixing ring, and the fixing ring is provided with a plurality of notches.

[0014] More preferably, it further comprises: a second electric push rod fixedly connected to the tank body; a sliding frame penetrating the tank body and in sliding connection therewith, the telescopic end of the second electric push rod being fixedly connected to the sliding frame; a plurality of second connecting rods, each fixedly connected between two adjacent first fixed shells in sliding connection with the tank body, all the second connecting rods being used to synchronously move all the first fixed shells.

[0015] The present application has the following advantages: 1. The solid catalytic absorbent composed of nanoscale high-activity calcium hydroxide, a catalyst and a special additive is used to facilitate the desulfurization and denitrification of flue gas in a tunnel at room temperature, effectively avoiding the heat accumulation in the tunnel caused by the high-temperature operation of traditional equipment, significantly improving the thermal comfort and safety of the construction environment, and reducing energy consumption and cooling demand; 2. The first fixed shell is used as a physical barrier for the flue gas flow, forcing the flue gas to change the flow direction when passing through the solid catalytic absorbent layer, forming a detour penetration path, effectively prolonging the residence time of the flue gas in the catalytic reaction zone, significantly increasing the contact time and reaction opportunity between the flue gas and the absorbent, and enhancing the stability and reliability of the purification process; 3. By controlling the operation of the first electric push rod, relative movement between the second fixed shell and the fixed plate is driven, which automatically discharges and replaces the saturated and ineffective solid catalytic absorbent in the shell, significantly improving the automation and safety of absorbent replacement, effectively avoiding the interruption of purification caused by the replacement process, and ensuring the continuous and efficient desulfurization and denitrification reaction; 4. By controlling the operation of the second electric push rod, the first fixed shell moves relative to the adjacent second fixed shell, increasing the depth of the first fixed shell inserted into the solid catalytic absorbent in the adjacent second fixed shell, further controlling the residence time of the flue gas in the solid catalytic absorbent, and facilitating the flexible optimization of reaction efficiency according to the actual working conditions such as the pollution concentration and flow variation of the tunnel blasting flue gas: deepening the insertion to prolong the reaction time under high pollution load to ensure complete purification, and moderately retracting to reduce system resistance and save energy under low load. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of the present application; Figure 2 is a schematic diagram of the three-dimensional structure at the first fixed shell and the second fixed shell of the present application; Figure 3 is a sectional view of the tank body and the first fixed shell of the present application; Figure 4 is a sectional view of the second fixed shell and the fixed plate of the present application.

[0017] The reference numbers in the figure are: 1-tank body, 101-gas injection port, 102-exhaust port, 103-material injection port, 2-first fixed shell, 3-air guide tube, 4-second fixed shell, 5-third fixed shell, 501-discharge port, 6-circular tube, 7-drive motor, 8-first electric push rod, 9-sleeve, 10-first connecting rod, 11-fixed plate, 12-spiral plate, 13-stirring frame, 14-impeller, 15-fixed ring, 16-second electric push rod, 17-sliding frame, 18-second connecting rod. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: A tunnel blasting excavation flue gas desulfurization and denitrification integrated machine, such as Figure 1-Figure 3 As shown, it includes: a tank body 1, a control panel is fixedly connected to the front of the tank body 1, and the upper and lower parts of the tank body 1 are respectively provided with an air injection port 101 and an exhaust port 102, the central axis of the air injection port 101 is away from the central axis of the tank body 1, and is used for the flue gas injected into the tank body 1 through the air injection port 101 to rotate in the tank body 1; two first fixed shells 2, both are arranged in the tank body 1, and all the first fixed shells 2 are located between the air injection port 101 and the exhaust port 102; an air guide pipe 3, rotatably arranged on the tank body 1; two second fixed shells 4, both are arranged on the air guide pipe 3, and the second fixed shell 4 stores a solid catalytic absorber, which is composed of nano-scale high-activity calcium hydroxide, a catalyst and a special additive. The solid catalytic absorber is used to remove sulfur dioxide and nitrogen oxides in the flue gas at room temperature and normal pressure environment; a third fixed shell 5, fixed to the bottom of the tank body 1, and the third fixed shell 5 is provided with an air vent, which is used to filter particulate impurities in the flue gas.

[0020] like Figure 1-Figure 3As shown, the two first fixed shells 2 and the two second fixed shells 4 are staggered. Under the blocking effect of the first fixed shell 2, the flue gas is forced to change its flow direction when passing through the solid catalytic absorbent layer in the second fixed shell 4, forming a circuitous infiltration path, delaying the floating of the flue gas, and the air duct 3 is fixed with two groups of circular tubes 6. The number of circular tubes 6 in each group is four and circumferentially equidistant. Exhaust holes are opened at the lower part of the circular tubes 6. A one-way valve is installed in the exhaust hole of the circular tubes 6. The circular tubes 6 are used to inject oxygen into the solid catalytic absorbent. The lower surface of the tank body 1 is fixed with a drive motor 7 through a support. The output shaft of the drive motor 7 and the lower part of the air duct 3 are fixed with gears. The two gears are engaged. The drive motor 7 is used to drive the air duct 3 and the circular tube 6 to rotate, and the control panel is electrically connected to the drive motor 7.

[0021] The working process of the integrated desulfurization and denitrification machine for tunnel blasting excavation in this embodiment is as follows: During the tunnel blasting excavation process, the equipment is transported to the designated area, and then the operator installs two drive fans on the tank body 1. The two drive fans are respectively located in the air injection port 101 and the exhaust port 102, and the oxygen supply unit is installed in the air duct 3. Then the operator starts the two drive fans, the oxygen supply unit and the drive motor 7 through the control panel on the tank body 1. The two drive fans work to allow the flue gas in the tunnel to enter the tank body 1 through the air injection port 101, and then the flue gas flows upward through the air vents on the third fixed shell 5 to the vicinity of the first fixed shell 2 on the lower side. Under the blocking effect of the first fixed shell 2, the flue gas flows downward to the solid catalytic absorber of the second fixed shell 4 on the lower side, and then the flue gas flows upward from the middle of the first fixed shell 2. After that, the flue gas repeats the above flow through the first fixed shell 2 on the upper side, and finally the flue gas is discharged from the exhaust port 102.

[0022] During the flow of flue gas, the oxygen supply unit works to inject oxygen into the air guide pipe 3, so that the oxygen is discharged from the exhaust hole on the circular tube 6, and the flue gas flows upward in the solid catalytic absorbent. In this process, the drive motor 7 works to drive the air guide pipe 3 to rotate, and the air guide pipe 3 drives all the circular tubes 6 to rotate together, so that the circular tubes 6 stir the solid catalytic absorbent in the second fixed shell 4 to make it more uniform, and the rotation of the circular tubes 6 makes the oxygen evenly distributed in the solid catalytic absorbent. The oxygen catalyzes the nitrogen oxides in the flue gas to convert the nitrogen oxides into absorbable nitrate ions. Then the nano-scale high-activity calcium hydroxide in the solid catalytic absorbent absorbs the nitrate ions, thereby achieving the purpose of removing nitrogen oxides. At the same time, the nano-scale high-activity calcium hydroxide absorbs sulfur dioxide, thereby completing the effects of both denitrification and desulfurization.

[0023] After the device has been working for a specified time, the control panel turns off the two driving fans, the oxygen supply unit and the driving motor 7, and the blasting excavation operation of the tunnel is stopped at this time. The operator replaces the solid catalytic absorber in the tank body 1. After the replacement is completed, the two driving fans, the oxygen supply unit and the driving motor 7 in the device are started again, and the tunnel blasting excavation operation can be carried out again.

[0024] Example 2: Based on Example 1, Figure 2 and Figure 3 As shown, it also includes: a first electric push rod 8, fixed to the tank body 1, and the first electric push rod 8 is electrically connected to the control panel; a sleeve 9, fixed to the telescopic end of the first electric push rod 8, the sleeve 9 is sleeved on the outside of the air guide tube 3, and the tank body 1 and the third fixed shell 5 are both slidably connected to the sleeve 9, and the upper end of the sleeve 9 is fixed to the lower surface of the adjacent second fixed shell 4; four first connecting rods 10, fixed between the two second fixed shells 4, the number of which is the number shown in the drawings (the actual number can be adjusted as needed, when the second fixed shell 4 has three, the first connecting rod 10 has two groups, each group of first connecting rods 10 is installed between two adjacent second fixed shells 4), and the first connecting rod 10 penetrates the adjacent first fixed shell 2 and is slidably connected thereto, the second fixed shell 4 is slidably connected to the air duct 3, and the four first connecting rods 10 are used together to synchronously move the two second fixed shells 4; two fixed plates 11 are both fixed to the air duct 3, and the fixed plates 11 are slidably connected to the adjacent second fixed shells 4. The upper surface of the fixed plate 11 is set as a frustum to reduce the residue of the solid catalytic absorbent. The tank body 1 is provided with a filling port 103 for installing a switch valve, and the third fixed shell 5 is provided with a discharge port 501 for installing a switch valve.

[0025] like Figure 2-Figure 4 As shown, the third fixed shell 5 is fixed with a spiral plate 12, which is used to guide the gas to rotate, the air guide pipe 3 is fixed with two stirring racks 13, the stirring racks 13 are located in the adjacent first fixed shell 2, the air guide pipe 3 is fixed with an impeller 14, and the impeller 14 is located between the two stirring racks 13, the upper second fixed shell 4 is fixed with a fixing ring 15, and the fixing ring 15 is provided with a plurality of notches for the flow of flue gas. During the downward movement of the second fixed shell 4, the second fixed shell 4 drives the fixing ring 15 to move downward, so that the fixing ring 15 covers the outside of the impeller 14.

[0026] The working process of this embodiment is similar to that of the first embodiment and is described in detail as follows: During the process of treating the flue gas in the tunnel, after the flue gas enters the tank body 1 through the gas injection port 101, the flue gas rotates between the tank body 1 and the third fixed shell 5 under the guidance of the spiral plate 12. This rotation causes the particulate impurities in the flue gas to gather near the inner wall of the tank body 1 under the action of centrifugation, reducing the covering of the vent holes on the third fixed shell 5 by the particulate impurities, ensuring the stability of the flow rate of the flue gas in the tank body 1, improving the coordinated treatment efficiency of desulfurization, denitrification and dust removal, ensuring the operational reliability and durability of the device, and subsequently repeating the above operations to perform desulfurization and denitrification operations on the flue gas.

[0027] During the desulfurization and denitrification operation of the flue gas, the control panel intermittently starts the first electric push rod 8, wherein the telescopic end of the first electric push rod 8 drives the sleeve 9, the two second fixed shells 4 and all the first connecting rods 10 to move downward together. During this process, the second fixed shell 4 and the fixed plate 11 move relative to each other, so that the solid catalytic absorber in the second fixed shell 4 falls downward by exceeding its upper edge, wherein the solid catalytic absorber in the lowermost second fixed shell 4 falls into the third fixed shell 5. Then the operator starts the switch valve at the injection port 103 and the switch valve at the discharge port 501 through the control panel to discharge the saturated solid catalytic absorber in the third fixed shell 5, and the subsequent operator adds new solid catalytic absorber to the injection port 103. After the telescopic end of the first electric push rod 8 is extended for a set time, the control panel controls the telescopic end of the first electric push rod 8 to retract and reset, and then repeats the above-mentioned desulfurization and denitrification treatment of the flue gas. In this process, the solid catalytic absorber is replaced online, which effectively avoids the purification interruption caused by the replacement process and ensures that the desulfurization and denitrification reactions are carried out continuously and efficiently.

[0028] During the desulfurization and denitrification process of the flue gas, the rotation of the air duct 3 simultaneously drives the rotation of the stirring frame 13 and the impeller 14, wherein the rotation of the stirring frame 13 stirs and loosens the solid catalytic absorber in the middle of the first fixed shell 2, so as to facilitate uniform contact between the flue gas and the solid catalytic absorber, and the rotation of the impeller 14 stirs the flue gas in the tank body 1, so as to facilitate uniform flue gas concentration, significantly improving the contact efficiency and reaction consistency between the flue gas and the solid catalytic absorber, avoiding the problem of local excessive reaction or insufficient purification caused by uneven concentration field, thereby ensuring that the solid catalytic absorber can efficiently and stably perform desulfurization and denitrification functions within the entire cross-section, improving the overall purification efficiency and reaction rate, and enhancing the processing capacity and operation stability of the device under complex working conditions.

[0029] Example 3: Based on Example 2, Figure 1-Figure 3As shown, it also comprises: a second electric push rod 16 fixed to the tank body 1, the second electric push rod 16 being electrically connected with the control panel; a sliding frame 17 penetrating the tank body 1 and being in sliding connection with the tank body 1, the telescopic end of the second electric push rod 16 being fixed to the sliding frame 17; four second connecting rods 18, each being fixed between two first fixed shells 2, the number being the number shown in the drawing (the actual number can be adjusted as needed, when the first fixed shell 2 has three, the second connecting rod 18 has two groups, and each group of the second connecting rod 18 is installed between two adjacent first fixed shells 2), the first fixed shell 2 being in sliding connection with the tank body 1, the upper surface of the first fixed shell 2 being a circular truncated surface, the circular truncated surface of the first fixed shell 2 being used to reduce the solid catalytic absorbent remaining thereon, and all the second connecting rods 18 being used to make all the first fixed shells 2 move synchronously.

[0030] The working process of the embodiment is continued from the embodiment 2, and the detailed description is as follows: In the process of desulfurization and denitrification treatment of flue gas, the operator controls the second electric push rod 16 to work through the control panel, so that the telescopic end of the second electric push rod 16 drives the sliding frame 17, all the second connecting rods 18 and the two first fixed shells 2 to move downward together, so that the first fixed shell 2 is inserted into the solid catalytic absorbent in the second fixed shell 4, the residence time of flue gas in the solid catalytic absorbent is prolonged, the contact time and reaction opportunity of flue gas and solid catalytic absorbent are significantly increased, and the completeness and conversion efficiency of the desulfurization and denitrification reaction are improved, which is especially beneficial to improving the removal effect of low-concentration or difficult-to-react components.

[0031] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tunnel blasting excavation flue gas desulfurization and denitrification integrated machine, characterized by comprising: A tank body (1), wherein the tank body (1) is provided with a gas injection port (101) and an exhaust port (102); A plurality of first fixed shells (2) are all arranged in the tank body (1), and all of the first fixed shells (2) are located between the gas injection port (101) and the gas exhaust port (102); An air guide tube (3) is rotatably mounted on the tank body (1); A plurality of second fixed shells (4) are all arranged on the air guide pipe (3), the number of the second fixed shells (4) being the same as the number of the first fixed shells (2), the second fixed shells (4) storing a solid catalytic absorber, the solid catalytic absorber consisting of nano-scale highly active calcium hydroxide, a catalyst and a special auxiliary agent, and the solid catalytic absorber is used to remove sulfur dioxide and nitrogen oxides from flue gas at room temperature; The third fixed shell (5) is fixedly connected to the bottom of the tank body (1), and the third fixed shell (5) is provided with a vent hole.

2. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 1 is characterized in that: The plurality of first fixed shells (2) and the plurality of second fixed shells (4) are distributed in a staggered manner, and the first fixed shells (2) are used to delay the rising of smoke.

3. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 2 is characterized in that: The air guide pipe (3) is fixedly connected to a plurality of circular tubes (6), each of which is provided with an exhaust hole. A one-way valve is installed in the exhaust hole of the circular tube (6), and the circular tube (6) is used to inject oxygen into the solid catalytic absorbent.

4. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 3 is characterized in that: The tank body (1) is fixedly connected to a drive motor (7), and a gear set is used to transmit power between the output shaft of the drive motor (7) and the air guide tube (3). The drive motor (7) is used to drive the air guide tube (3) and the circular tube (6) to rotate.

5. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 4 is characterized in that: include: A first electric push rod (8) is fixedly connected to the tank body (1); A sleeve (9) is fixedly connected to the telescopic end of the first electric push rod (8), the sleeve (9) is sleeved on the outside of the air guide tube (3), and the tank body (1) and the third fixed shell (5) are both slidably connected to the sleeve (9), and the sleeve (9) is fixedly connected to the adjacent second fixed shell (4); A plurality of first connecting rods (10) are respectively fixed between two adjacent second fixed shells (4), and the first connecting rods (10) penetrate the adjacent first fixed shells (2) and are slidably connected thereto, the second fixed shells (4) are slidably connected to the air guide tube (3), and all the first connecting rods (10) are used together to enable all the second fixed shells (4) to move synchronously; A plurality of fixed plates (11) are fixedly connected to the air guide tube (3), the number of the fixed plates (11) is the same as the number of the second fixed shells (4), the fixed plates (11) are slidably connected to the adjacent second fixed shells (4), the tank body (1) is provided with a material injection port (103) for installing a switch valve, and the third fixed shell (5) is provided with a material discharge port (501) for installing a switch valve.

6. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 5, characterized in that: The fixed plate (11) is provided with a circular table surface for reducing the residue of the solid catalytic absorbent.

7. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 6, characterized in that: The third fixed shell (5) is fixedly connected to a spiral plate (12), and the spiral plate (12) is used to guide the rotation of the gas.

8. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 7, characterized in that: The air guide tube (3) is fixedly connected to a plurality of stirring racks (13), the number of the stirring racks (13) is the same as the number of the first fixed shells (2), and the stirring racks (13) are located in adjacent first fixed shells (2).

9. The integrated desulfurization and denitrification machine for tunnel blasting excavation flue gas according to claim 8, characterized in that: The air guide pipe (3) is fixedly connected to an impeller (14), and the second fixed shell (4) close to the impeller (14) is fixedly connected to a fixed ring (15), and the fixed ring (15) is provided with a plurality of notches.

10. The integrated desulfurization and denitrification machine for tunnel blasting excavation according to claim 9, characterized in that: include: A second electric push rod (16) is fixedly connected to the tank body (1); A sliding frame (17) penetrates the tank body (1) and is slidably connected thereto, and a telescopic end of the second electric push rod (16) is fixedly connected to the sliding frame (17); A plurality of second connecting rods (18) are respectively fixed between two adjacent first fixed shells (2), the first fixed shells (2) are slidably connected to the tank body (1), and all the second connecting rods (18) are used to enable all the first fixed shells (2) to move synchronously.

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