A precise control system for wet desulfurization and oxidation air volume in coal-fired power plants

Abstract

The present invention relates to the technical field of wet flue gas desulfurization, and more specifically to a precise control system for wet flue gas desulfurization oxidation air volume in a coal-fired power plant, comprising a blast assembly arranged in an absorption tower, the blast assembly comprising: a blast pipe, a symmetrically provided ejection slot at the end thereof, a first end of the ejection slot being provided with an inclined push slope; a movable seat, a symmetrical piston slidably arranged in the blast pipe, the movable seat being driven by the wind pressure in the blast pipe to slide relatively away to expose the ejection slot; a cleaning block. The precise control system for wet flue gas desulfurization oxidation air volume in a coal-fired power plant provided by the invention utilizes a movable seat slidably arranged in the blast pipe by a piston, when the air volume blown into the blast pipe by the oxidation fan decreases, the air pressure inside the blast pipe decreases, and the two movable seats slide relatively close to cover part of the ejection slot, thereby maintaining the ejection speed of the gas at the ejection slot, and avoiding the problem that the slurry will enter and adhere to the inner wall of the blast pipe to form a crystal layer due to the change in air volume.

Description

Technical Field

[0001] The present invention relates to the technical field of wet desulfurization, and in particular to a precise control system for wet desulfurization oxidation air volume in a coal-fired power plant. Background Art

[0002] At present, coal-fired power plants often use wet desulfurization technology to treat the sulfur element in the flue gas. The technical principle of wet desulfurization is that the lime slurry in the absorption tower circulates to absorb SO2 in the flue gas to generate CaSO3. When air is blown into the lime slurry, CaSO3 can be oxidized into CaSO4 to generate gypsum.

[0003] According to publication number CN117244387A, publication (announcement) date: 2023.12.19, a system and method for online monitoring and controlling the oxidation state of wet desulfurization slurry is disclosed. It belongs to the technical field of limestone-gypsum wet desulfurization. By comparing the flue gas parameters and the oxidation air flow rate as prediction parameters, and using DO and ORP as feedback parameters reflecting the oxidation state, the desulfurization oxidation air volume is precisely controlled in a prediction-feedback adjustment manner, which is beneficial to further improve the online monitoring level of the desulfurization oxidation reaction, prevent a series of problems caused by insufficient slurry oxidation, and achieve energy-saving optimization of the oxidation system.

[0004] According to publication number CN112682342B, publication (announcement) date: 2023.05.12, a method and device for controlling the air volume of oxidation air for wet desulfurization slurry is disclosed, wherein the method includes: obtaining the operating cost of the desulfurization system within a fixed time interval; detecting the concentration of calcium sulfite within the fixed time interval; regularly adjusting the air volume of oxidation air according to the concentration of calcium sulfite; obtaining the operating cost of the desulfurization system within the fixed time interval after adjusting the air volume of oxidation air; comparing the operating costs before and after adjusting the air volume, and determining that the air volume of oxidation air corresponding to the minimum operating cost is the optimal air volume of oxidation air. The present invention reasonably adjusts the air volume of oxidation air by calculating the operating cost of the desulfurization system within a fixed time interval and detecting the concentration of calcium sulfite, thereby improving the desulfurization efficiency, ensuring the quality of gypsum, and saving operating costs, thereby achieving the effect of safe operation of equipment and energy saving and consumption reduction.

[0005] In the prior art including the above-mentioned patent, air is blown into the lime slurry in the absorption tower by using an oxidation air duct network arranged in the desulfurization absorption tower, and the air volume blown into the slurry by the oxidation fan is regulated by detecting the concentration of calcium sulfite. When the air volume blown by the oxidation fan changes from large to small, the pressure in the oxidation air duct decreases so that the slurry will enter and adhere to the inner wall of the oxidation air duct and then be blown out again. Long-term reciprocation can easily cause a crystal layer to form inside the oxidation air duct orifice, causing the oxidation air duct orifice to become smaller. Summary of the invention

[0006] The purpose of the present invention is to provide a precise control system for wet desulfurization and oxidation air volume in a coal-fired power plant to solve the above-mentioned problems.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a precise control system for wet desulfurization and oxidation air volume in a coal-fired power plant, comprising an absorption tower and an air blast assembly arranged in the absorption tower, wherein the air blast assembly comprises:

[0008] The blast pipe has a symmetrically disposed ejection slot at its end, and a first end of the ejection slot is provided with an inclined push slope;

[0009] A movable seat, whose symmetrical piston is slidably arranged in the blast pipe, and the movable seat is driven by the wind pressure in the blast pipe to slide relatively away to expose the ejection slot;

[0010] The cleaning block is symmetrically provided with a sliding part, which is slidably arranged in a vertical slide groove opened on the movable seat. The first end of the cleaning block is provided with an inclined resistance surface. The movable seat is driven to slide relatively so that the inclined resistance surface resists the inclined push slope and slides, and the cleaning block moves to scratch the inner wall of the spray groove.

[0011] Preferably, a secondary spray groove is provided on the cleaning block, the narrow end of the secondary spray groove is connected to the inclined resistance surface, and the wide end faces the inner side of the blower pipe, and the movable seat is driven to slide away relatively so that the inclined push slope pushes the cleaning block to slide along the vertical slide groove, and the narrow end of the secondary spray groove moves closer to the inclined push slope.

[0012] Preferably, it also includes a rotating rod rotatably arranged on the movable seat, and driving blades and windward blades are arranged in a circular array at both ends of the rotating rod. The driving blades are located on the outside of the blast pipe, and the windward blades are located on the inside of the blast pipe. The airflow in the blast pipe is ejected along the ejection hole to drive the windward blades to drive the rotating rod to rotate.

[0013] Preferably, the first elastic member is further included, with both ends respectively fixedly connected to the two movable seats to pull the movable seats to move relatively, close together and reset.

[0014] Preferably, it also includes a load-bearing ring seat which is rotatably disposed in the movable seat and is coaxial with the rotating rod and rotates in the opposite direction.

[0015] Preferably, the load-bearing ring seat is provided with contact portions in a circumferential array, the contact portions are provided with inclined surfaces, the cleaning block is provided with raised portions in a linear array, the raised portions are provided with arc-shaped abutment surfaces whose axes are parallel and offset to the axis of the load-bearing ring seat.

[0016] Preferably, it also includes a worm wheel component, a first transmission gear and a second transmission gear rotatably arranged in the movable seat, the worm wheel component is coupled with the worm portion arranged on the rotating rod, the first helical tooth portion of the worm wheel component is coupled with the second helical tooth portion of the first transmission gear, the first transmission gear is coupled with the secondary ring gear of the second transmission gear, and the second transmission gear is coupled with the load-bearing ring seat.

[0017] Preferably, the movable seat is provided with an arc-shaped slide groove with both ends connected to the vertical slide groove, one end of the arc-shaped slide groove is connected to the lowest position of the vertical slide groove, and the cleaning block is provided with a partial worm gear portion, and the movable seat is driven to slide away relatively so that the cleaning block slides along the vertical slide groove until the partial worm gear portion is coupled with the worm gear portion, and the rotating rod keeps rotating to drive the sliding portion into the arc-shaped slide groove through the worm gear portion and the partial worm gear portion, and the cleaning block is inclined to contact the inclined push slope so that the narrow end of the secondary spray slot is inclined toward the inclined push slope.

[0018] Preferably, a linear array of through-shaped windward holes is provided on the windward blade, and openings at both ends of the windward holes are respectively a wide hole and a narrow hole.

[0019] Preferably, the cleaning block is symmetrically provided with extensions located in the movable grooves of the movable seat, and the movable grooves are provided with a second elastic member and a third elastic member, one end of which is connected to the extensions to drive the cleaning block to slide and return to a vertical shape.

[0020] In the above technical scheme, the invention provides a coal-fired power plant wet desulfurization oxidation air volume precision control system, which has the following beneficial effects: using a movable seat slidably arranged in the blast pipe by a piston, when the air volume blown into the blast pipe by the oxidation blower decreases, the air pressure inside the blast pipe decreases, and the two movable seats slide relatively close to block part of the ejection slot, thereby maintaining the ejection speed of the gas at the ejection slot, avoiding the problem of slurry entering and sticking to the inner wall of the blast pipe to form a crystal layer due to changes in air volume. Secondly, the movable seat is used to drive the cleaning block to move and scratch the clean ejection slot, avoiding the problem of the ejection slot being blocked by the crystal layer on the inner wall of the ejection slot, and further ensuring the stability of the blast pipe blowing the slurry through the ejection slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of an air blowing assembly provided in an embodiment of the present invention;

[0024] Figure 3 A schematic cross-sectional view of the transverse structure of an air blowing assembly provided in an embodiment of the present invention;

[0025] Figure 4 A schematic cross-sectional view of the vertical structure of the vertical slide groove of the movable seat provided in an embodiment of the present invention;

[0026] Figure 5 A schematic cross-sectional view of the vertical structure of the air blowing assembly provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a rotating rod, a load-bearing ring seat and a transmission assembly provided in an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the exploded structure of the load-bearing ring seat and the cleaning block provided in an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the explosion structure when the sliding portion of the cleaning block provided by the embodiment of the present invention is located in the arc-shaped slide groove;

[0030] Fig. 9 A schematic structural diagram of a cleaning block, a second elastic member and a third elastic member provided in an embodiment of the present invention;

[0031] Fig.10 The embodiment of the present invention provides Figure 4 A local enlarged schematic diagram of the middle A;

[0032] Fig.11 The embodiment of the present invention provides Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0033] Fig.12 The embodiment of the present invention provides Figure 8 A partial enlarged schematic diagram of point C in the middle.

[0034] Description of reference numerals:

[0035] 1. Absorption tower; 11. Smoke outlet; 12. Spray pipe; 13. Smoke inlet pipe; 14. Slurry discharge pipe; 2. Blowing assembly; 21. Blowing pipe; 211. Spraying slot; 2111. Inclined push slope; 3. Movable seat; 31. Vertical slide slot; 32. Arc slide slot; 33. Movable slot; 4. Rotating rod; 41. Driving blade; 42. Windward blade; 421. Windward hole; 43. Worm; 5. Cleaning block; 51. Inclined contact surface; 52. Secondary spray slot; 53, sliding portion; 54, partial worm gear portion; 55, extension portion; 56, raised portion; 561, arc-shaped abutment surface; 6, load-bearing ring seat; 61, contact portion; 611, inclined surface; 71, worm wheel; 711, first oblique tooth portion; 72, first transmission gear; 721, second oblique tooth portion; 73, second transmission gear; 731, secondary ring gear; 91, first elastic member; 92, second elastic member; 93, third elastic member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0037] like Figure 1-12 As shown, a coal-fired power plant wet desulfurization oxidation air volume precision control system includes an absorption tower 1 and an air blast assembly 2 arranged in the absorption tower 1. The air blast assembly 2 includes:

[0038] The blast pipe 21 has a symmetrically disposed ejection slot 211 at its end, and a first end of the ejection slot 211 is provided with an inclined push slope 2111;

[0039] The movable seat 3 has a symmetrical piston slidably disposed in the blast pipe 21. The movable seat 3 is driven by the wind pressure in the blast pipe 21 to slide relatively away to expose the ejection slot 211.

[0040] The cleaning block 5 is symmetrically provided with a sliding portion 53, which is slidably arranged in a vertical slide groove 31 provided on the movable seat 3. An inclined resistance surface 51 is arranged at the first end of the cleaning block 5. The movable seat 3 is driven to slide relatively so that the inclined resistance surface 51 resists the inclined push slope 2111 to slide, and the cleaning block 5 moves to scratch the inner wall of the ejection groove 211.

[0041] Specifically, Figure 1As shown, the absorption tower 1 is provided with a smoke exhaust port 11, a spray pipe 12, a smoke inlet pipe 13 and a slurry discharge pipe 14. The smoke is discharged into the absorption tower 1 through the smoke inlet pipe 13, and the lime slurry is sprayed in the absorption tower 1 through the spray pipe 12. The smoke contacts and reacts with the lime slurry for desulfurization, and the desulfurized smoke is discharged along the smoke exhaust port 11. The lime slurry is discharged from the absorption tower 1 from the slurry discharge pipe 14. The end of the blast pipe 21 extends into the absorption tower 1 and the end of the blast pipe 21 is provided with a spray groove 211, and the other end of the blast pipe 21 is connected to an oxidation fan, which blows air into the slurry at the bottom of the absorption tower 1 through the blast pipe 21 and the spray groove 211.

[0042] like Figure 5 As shown, the two movable seats 3 are symmetrically and horizontally slidably arranged in the blast pipe 21, and the piston of the movable seat 3 is slidably arranged. When the oxidation fan blows air into the blast pipe 21, the internal pressure of the blast pipe 21 increases to make the two movable seats 3 slide horizontally away, thereby making the movable seats 3 slide and expose the ejection slot 211. At this time, the blast pipe 21 blows air into the slurry in the absorption tower 1 through the ejection slot 211. When the amount of air blown into the blast pipe 21 by the oxidation fan decreases, the internal air pressure of the blast pipe 21 decreases, and the two movable seats 3 slide relatively close to cover part of the ejection slot 211, thereby maintaining the ejection speed of the gas at the ejection slot 211, thereby avoiding the problem that the slurry will enter and adhere to the inner wall of the blast pipe 21 to form a crystal layer due to changes in air volume.

[0043] Secondly, the cleaning block 5 is movably arranged on the movable seat 3 through the sliding part 53, and the end of the cleaning block 5 facing the ejection groove 211 is the first end, and the ends of the two ejection grooves 211 opposite to each other are the first ends. When the air pressure in the blast pipe 21 changes and causes the movable seat 3 to slide relatively, the cleaning block 5 moves horizontally following the movable seat 3, and the cleaning block 5 is also moved obliquely to scratch the inner wall of the ejection groove 211 due to the inclined resistance surface 51 of the cleaning block 5 abutting against the inclined push slope 2111, and then the cleaning block 5 is driven by the movable seat 3 to move and scratch the clean ejection groove 211, thereby avoiding the problem of crystallization layer on the inner wall of the ejection groove 211 causing blockage of the ejection groove 211, and further ensuring the stability of the blast pipe 21 in blowing the slurry through the ejection groove 211.

[0044] In the above technical solution, the movable seat 3 is slidably arranged in the blast pipe 21 by the piston. When the air volume blown into the blast pipe 21 by the oxidation blower decreases, the air pressure inside the blast pipe 21 decreases, and the two movable seats 3 slide relatively close to cover part of the ejection slot 211, thereby maintaining the ejection speed of the gas at the ejection slot 211, and avoiding the problem that the slurry will enter and adhere to the inner wall of the blast pipe 21 to form a crystal layer due to the change in air volume. Secondly, the movable seat 3 is used to drive the cleaning block 5 to move and scratch the ejection slot 211 to avoid the problem that the crystal layer is generated on the inner wall of the ejection slot 211 and the ejection slot 211 is blocked, and the stability of the blast pipe 21 blowing the slurry through the ejection slot 211 is further ensured.

[0045] As another embodiment provided by the present invention, a secondary spray groove 52 is provided on the cleaning block 5, the narrow end of the secondary spray groove 52 is connected to the inclined resistance surface 51, and the wide end faces the inner side of the blower pipe 21, and the movable seat 3 is driven to slide relatively away so that the inclined push slope 2111 pushes the cleaning block 5 to slide along the vertical slide groove 31, and the narrow end of the secondary spray groove 52 moves closer to the inclined push slope 2111.

[0046] Specifically, Fig.11 As shown, the narrow end of the secondary spray slot 52 is connected to the inclined abutment surface 51, and the wide end of the secondary spray slot 52 faces the inner side of the blast pipe 21. When the movable seat 3 is located at a position to shield the ejection slot 211, the cleaning block 5 abuts against the inner wall of the ejection slot 211 so that the wide end of the secondary spray slot 52 is closed by the inner wall of the ejection slot 211, thereby achieving that when the blast pipe 21 is not blowing, the ejection slot 211 is shielded by the movable seat 3, and the secondary spray slot 52 is shielded by the ejection slot 211, thereby preventing the slurry in the absorption tower 1 from flowing back into the blast pipe 21 and causing crystallization and leakage inside the blast pipe 21.

[0047] When the oxidation fan reduces the air blown into the blast pipe 21, the movable seat 3 slides away relatively due to the internal air pressure of the blast pipe 21 to expose part of the ejection slot 211. At this time, the cleaning block 5 follows the horizontal sliding of the movable seat 3 and also descends vertically along the vertical slide slot 31, but the narrow end of the secondary ejection slot 52 still extends out of the outside of the ejection slot 211, and the wide end of the secondary ejection slot 52 is connected to the inside of the blast pipe 21, thereby achieving that most of the air in the blast pipe 21 is vertically blown into the slurry along the ejection slot 211, and a small part of the blast pipe 21 is obliquely blown into the slurry of the absorption tower 1 along the secondary ejection slot 52, thereby causing a small part of the air to move obliquely toward the annular inner wall of the absorption tower 1, thereby avoiding the problem of insufficient reactive oxygen content in the slurry around the inner wall of the absorption tower 1 when the amount of blown air is small, thereby improving the uniformity of the overall oxidation of the slurry in the absorption tower 1, and also improving the uniformity of the overall slurry.

[0048] When the oxidation fan blows more air into the blast pipe 21, the sliding seat 3 slides away relatively due to the internal air pressure of the blast pipe 21 to expose the ejection slot 211. At this time, the cleaning block 5 follows the horizontal sliding of the movable seat 3 and also vertically descends along the vertical slide slot 31, and the narrow end of the secondary ejection slot 52 descends toward the inclined push slope 2111. At this time, part of the air in the blast pipe 21 is blown into the gap of the inclined push slope 2111 along the secondary ejection slot 52 to avoid the problem of slurry crystallization in the smaller airflow area of ​​the ejection slot 211 and the formation of a crystal layer, thereby ensuring the improvement of the flow stability of the ejection slot 211.

[0049] As another embodiment provided by the present invention, it also includes a rotating rod 4 rotatably arranged on the movable seat 3, and driving blades 41 and windward blades 42 are arranged in a circular array at both ends of the rotating rod 4. The driving blades 41 are located on the outside of the blast pipe 21, and the windward blades 42 are located on the inside of the blast pipe 21. The airflow in the blast pipe 21 is ejected along the ejection groove 211 to drive the windward blades 42 to drive the rotating rod 4 to rotate.

[0050] Specifically, Figure 5 As shown, a rotating rod 4 is rotatably arranged on the movable seat 3, and the windward blade 42 of the rotating rod 4 is located on the inner side of the blast pipe 21, and the driving blade 41 is located on the outer side of the blast pipe 21. When the oxidation fan blows air into the blast pipe 21, the movable seat 3 slides to expose the ejection slot 211, and the air is blown into the slurry along the ejection slot 211. When the air is blown into the slurry from the ejection slot 211, it will also push the windward blade 42 to continuously rotate the rotating rod 4. Therefore, the driving blade 41 on the rotating rod 4 continuously rotates to drive the slurry at the bottom of the absorption tower 1 to flow, so that the slurry flow at the bottom of the absorption tower 1 impacts the inner wall of the absorption tower 1 and obtains a more uniform slurry, thereby reducing the crystallization rate of the slurry.

[0051] Furthermore, the windward blade 42 is provided with a linear array of windward holes 421 in a through shape, and the openings at both ends of the windward holes 421 are respectively a wide hole and a narrow hole. Figure 6 As shown, the two ends of the windward hole 421 opened on the windward blade 42 are a wide hole and a narrow hole respectively. When the windward blade 42 is blown by the airflow, the wide hole of the windward blade 42 on one side of the rotating rod 4 faces the direction of the airflow, and the narrow hole of the windward blade 42 on the other side faces the direction of the airflow. Since the airflow enters the windward hole 421 along the wide hole and flows out from the narrow hole, it can generate a greater thrust on the windward blade 42, so that the rotating rod 4 can use the windward blade 42 and the windward hole 421 to be driven by the airflow to continue to rotate, thereby increasing the rotation stability of the rotating rod 4.

[0052] As another embodiment provided by the present invention, it also includes a first elastic member 91 whose two ends are respectively fixedly connected to the two movable seats 3 to pull the movable seats 3 to move relatively, close together and reset.

[0053] Specifically, Figure 3As shown, both ends of the first elastic member 91 are fixedly connected to the movable seat 3 respectively. When the oxidation blower does not blow air into the blast pipe 21, the first elastic member 91 pulls the two movable seats 3 to slide closer together to stably block the ejection slot 211.

[0054] During the operation of the absorption tower 1, the internal slurry will gradually become viscous. When the viscosity increases, crystallization is more likely to occur in the slurry, so more air needs to be blown in. The rotation of the driving blade 41 will also apply a relatively close reaction force to the movable seat 3. Therefore, the driving blade 41 and the first elastic member 91 apply a relatively sliding force to the movable seat 3, and the air pressure inside the blast pipe 21 applies a relatively sliding force to the movable seat 3. When the viscosity of the slurry increases, the resistance of the driving blade 41 of the rotating rod 4 increases to reduce the rotation speed of the rotating rod 4, and the reaction thrust of the rotating rod 4 on the movable seat 3 decreases so that the two movable seats are driven by the internal air pressure of the blast pipe 21 to slide relatively away to further expose the ejection groove 211, thereby increasing the air blowing flow rate, further avoiding crystallization of the slurry, and improving the uniformity of the slurry.

[0055] When the rotation speed of the rotating rod 4 decreases, the rotation speed of the windward blade 42 also decreases, and the total amount of gas ejected from the ejection slot 211 increases. However, the intermittent blocking time caused by the reduced rotation speed of the windward blade 42 becomes longer, thereby increasing the interval time of gas ejection from the ejection slot 211, thereby reducing the volume of the bubbles ejected from the ejection slot 211, increasing the contact area between the blown air and the slurry, further avoiding crystallization of the slurry and improving the uniformity of the slurry.

[0056] Furthermore, if the viscosity of the slurry on both sides of the blast pipe 21 is inconsistent, Figure 3 As shown, if the viscosity of the slurry at the left side of the blast pipe 21 is greater than that of the slurry on the right side, the rotation speed of the left rotating rod 4 is less than that of the right rotating rod 4, and the two movable seats 3 slide to the left as a whole due to the reaction force difference generated by the rotation speed difference of the rotating rod 4, thereby achieving that the opening of the left ejection slot 211 is larger than the opening of the right ejection slot 211, and realizing the adjustment of the size of the ejection slots 211 at different positions according to the different viscosities of some slurries, balancing the viscosity level of the overall slurry, and improving the desulfurization efficiency of the slurry to the flue gas.

[0057] The first elastic member 91 can be replaced by a spring, an elastic plate, an airbag or other elastic objects known to those skilled in the art.

[0058] As another embodiment provided by the present invention, it also includes a load-bearing ring seat 6 which is rotatably disposed in the movable seat 3 and is coaxial with the rotating rod 4 and rotates in the opposite direction.

[0059] Specifically, Figure 3The load ring seat 6 is coaxially rotated with the rotating rod 4, and there is a sliding seal between the movable seat 3 and the blast pipe 21. When the symmetrically arranged rotating rod 4 is driven by air to rotate synchronously, it will also apply a horizontal torsional force to the movable seat 3. The existence of the torsional force is likely to compress the movable seat 3 for a long time so that the dynamic seal on the movable seat 3 fails. The load ring seat 6 is arranged on the movable seat 3 and rotates coaxially with the rotating rod 4 in the opposite direction, and the load ring seat 6 and the rotating rod 4 rotate in the opposite direction to offset the torsional force applied by the rotating rod 4 to the movable seat 3, thereby improving the stability of the movable seal of the movable seat 3.

[0060] The load-bearing ring seat 6 can be driven to rotate by a motor in conjunction with gears, or driven to rotate by airflow, or can be replaced by other driving components known to those skilled in the art that can drive the load-bearing ring seat 6 and the rotating rod 4 to rotate coaxially and in opposite directions.

[0061] As another embodiment provided by the present invention, a contact portion 61 is provided in a circumferential array on the load ring seat 6, and a slope 611 is provided on the contact portion 61. A protrusion 56 is provided in a linear array on the cleaning block 5, and an arc-shaped contact surface 561 is provided on the protrusion 56, whose axis is parallel to the axis of the load ring seat 6 and offset.

[0062] Specifically, Figure 7 As shown, the weight ring seat 6 is provided with a contact portion 61 in a circumferential array, and the protrusion 56 of the cleaning block 5 is provided with an arc-shaped contact surface 561, and the axis of the arc-shaped contact surface 561 is offset and parallel to the axis of the weight ring seat 6, as shown in FIG. Fig.11 As shown, when the oxidation blower blows air into the blast pipe 21, the movable seat 3 is driven to slide relatively away to expose the ejection slot 211, and the cleaning block 5 slides down along the vertical slide slot 31, and the rotating rod 4 is driven by the airflow to continue to rotate, and the load-bearing ring seat 6 and the rotating rod 4 maintain reverse coaxial rotation to make a plurality of contact portions 61 rotate circumferentially. At this time, the contact portion 61 will rotate close to the protrusion 56, and the inclined surface 611 contacts the protrusion 56 to drive the contact portion 61 into between the protrusions 56. As the contact portion 61 continues to rotate circumferentially, the contact portion 61 contacts the arc-shaped contact surface 561 and makes the cleaning block 5 follow the contact portion 61 rotates and slides vertically downward along the vertical slide groove 31 until the contact portion 61 is disengaged from the protrusion 56, and the cleaning block 5 moves vertically upward to reset, and the other contact portion 61 rotates to contact and enter between the protrusions 56 to form a cycle, so that the contact portion 61 of the load-bearing ring seat 6 is used to drive the cleaning block 5 to perform vertical reciprocating shaking, thereby causing a collision and a gap between the cleaning block 5 and the inclined push slope 2111, so that the crystal layer on the inclined push slope 2111 is scratched by the cleaning block 5 and discharged by the impact of the gas, thereby further realizing the cleaning of the inner wall of the ejection groove 211 and improving the ejection stability of the ejection groove 211.

[0063] As another embodiment provided by the present invention, it also includes a worm wheel component 71, a first transmission gear 72 and a second transmission gear 73 rotatably arranged in the movable seat 3, the worm wheel component 71 is coupled with the worm portion 43 arranged on the rotating rod 4, the first bevel tooth portion 711 of the worm wheel component 71 is coupled with the second bevel tooth portion 721 of the first transmission gear 72, the first transmission gear 72 is coupled with the secondary ring gear 731 of the second transmission gear 73, and the second transmission gear 73 is coupled with the load-bearing ring seat 6.

[0064] Specifically, Figure 6 As shown, the worm gear 71 is coupled to the worm portion 43 of the rotating rod 4, the first bevel tooth portion 711 of the worm gear 71 is coupled to the second bevel tooth portion 721 of the first transmission gear 72, the first transmission gear 72 is coupled to the secondary ring gear 731 of the second transmission gear 73, and the second transmission gear 73 is coupled to the load ring seat 6. When the rotating rod 4 is driven to rotate by the air flow inside the blower pipe 21, the worm portion 43, the worm gear 71, the first transmission gear 72 and the second transmission gear 73 are utilized to drive the load ring seat 6 to rotate in the opposite direction to the rotating rod 4, thereby improving the driven activity stability of the load ring seat 6 without the need for an additional driving source, thereby improving the operating stability of the rotating rod 4 and the load ring seat 6.

[0065] As another embodiment provided by the present invention, an arc-shaped slide groove 32 is provided on the movable seat 3, both ends of which are connected to the vertical slide groove 31, one end of the arc-shaped slide groove 32 is connected to the lowest position of the vertical slide groove 31, and a partial worm gear portion 54 is provided on the cleaning block 5. The movable seat 3 is driven to slide relatively away so that the cleaning block 5 slides along the vertical slide groove 31 until the partial worm gear portion 54 is coupled with the worm portion 43, and the rotating rod 4 keeps rotating to drive the sliding portion 53 into the arc-shaped slide groove 32 through the worm portion 43 and the partial worm gear portion 54, and the cleaning block 5 is inclined to contact the inclined push slope 2111 so that the narrow end of the secondary spray slot 52 is inclined toward the inclined push slope 2111.

[0066] Specifically, Fig.10 As shown, the movable seat 3 is provided with an arc-shaped slide groove 32 and a vertical slide groove 31, and the sliding portion 53 of the cleaning block 5 is located between the vertical slide groove 31 and the movable seat 3. Fig.11 As shown, a partial worm gear portion 54 is provided on the cleaning block 5. When the oxidation blower blows a large amount of air into the blast pipe 21, the movable seat 3 is driven to move relatively away to the farthest position and completely expose the ejection slot 211. At this time, the cleaning block 5 is pushed by the inclined push slope 2111 and slides vertically to the lowest vertical position. At this time, the sliding portion 53 is located at the lowest position of the vertical slide groove 31, and the partial worm gear portion 54 is coupled with the worm portion 43. When the rotating rod 4 is driven to rotate by the airflow, the worm portion 43 rotates and drives the sliding portion 53 to move into the arc-shaped slide groove 32, and the cleaning block 5 is driven to slide and rotate in an inclined state, as shown in FIG. Fig.12As shown, when the cleaning block 5 is inclined, the first end of the cleaning block 5 is inclined to abut against the inclined push slope 2111 so that there is a gap between the inclined push slope 2111 and the inclined abutting surface 51, and the narrow mouth of the secondary spray slot 52 is inclined toward the inclined push slope 2111. At this time, most of the air in the blast pipe 21 is vertically blown into the slurry along the ejection slot 211, and a small part of the air flows out along the secondary spray slot 52 and then moves along the inclined push slope 2111 and moves vertically upward to the ejection slot 211, so that when the ejection slot 211 is opened to the maximum, the gas is divided into two streams and ejected separately and collided alternately, so that the air bubbles ejected into the slurry collide with each other to further reduce the volume of the bubbles, thereby increasing the contact area between the air and the slurry to increase the desulfurization rate and reduce the crystallization rate.

[0067] Secondly, when the sliding portion 53 of the cleaning block 5 is driven into the arc-shaped slide groove 32, the cleaning block 5 is inclined so that the protrusion 56 moves away from the load-bearing ring seat 6, and the rotating rod 4 also drives the load-bearing ring seat 6 to rotate, but the load-bearing ring seat 6 rotates so that the contact portion 61 pushes against the protrusion 56 on the lowermost side of the cleaning block 5 in turn, and then the contact portion 61 pushes against the protrusion 56 to drive the cleaning block 5 to rotate around the axis of the sliding portion 53. The narrow mouth of the secondary spray slot 52 rotates close to the inclined push slope 2111 and then moves away, thereby intermittently reducing the gap between the inclined push slope 2111 and the cleaning block 5, further increasing the ejection speed of the bubbles ejected from the secondary spray slot 52 to the side of the ejection slot 211, thereby further reducing the volume of the bubbles.

[0068] Furthermore, the cleaning block 5 is symmetrically provided with an extension portion 55 located in the movable groove 33 of the movable seat 3, and the movable groove 33 is provided with a second elastic member 92 and a third elastic member 93, one end of which is connected to the extension portion 55 to drive the cleaning block 5 to slide back to a vertical state. Fig.10 As shown, the second elastic member 92 is used to drive the cleaning block 5 to slide vertically upward and reset, and the second elastic member 92 is used to push the extension portion 55 to rotate the cleaning block 5 and reset it to a vertical state. When the sliding portion 53 of the cleaning block 5 is driven into the arc-shaped slide groove 32, the cleaning block 5 is pushed by the second elastic member 92 and the third elastic member 93 and slides along the arc-shaped slide groove 32 until the first end of the cleaning block 5 abuts against the inclined push slope 2111. At this time, the cleaning block 5 is locked in an inclined state. Only when the amount of air blown into the blower pipe 21 by the oxidation fan decreases, the movable seat 3 slides relatively close to each other. At this time, the cleaning block 5 is separated from the inclined push slope 2111, so that the second elastic member 92 and the third elastic member 93 can drive the cleaning block 5 to reset to a vertical state.

[0069] The second elastic member 92 and the third elastic member 93 can be replaced by springs, elastic plates, air bags and other elastic objects known to those skilled in the art.

[0070] Working principle: When the oxidation blower blows air into the blower pipe 21, the pressure inside the blower pipe 21 increases so that the two movable seats 3 slide away horizontally, and then the movable seats 3 slide and expose the ejection slot 211. At this time, the blower pipe 21 blows air into the slurry of the absorption tower 1 through the ejection slot 211, and the cleaning block 5 is also moved obliquely to scrape the inner wall of the ejection slot 211 because the inclined abutting surface 51 of the cleaning block 5 abuts against the inclined push slope 2111.

[0071] When the air blown into the blast pipe 21 by the oxidation blower decreases, most of the air in the blast pipe 21 is blown vertically into the slurry along the ejection slot 211, and a small part of the air in the blast pipe 21 is blown obliquely into the slurry in the absorption tower 1 along the secondary ejection slot 52, thereby causing a small part of the air to move obliquely toward the annular inner wall of the absorption tower 1.

[0072] When the oxidation fan blows more air into the blast pipe 21, the narrow end of the secondary spray slot 52 drops toward the inclined push slope 2111. At this time, part of the air in the blast pipe 21 blows along the secondary spray slot 52 into the gap of the inclined push slope 2111 to prevent the slurry from crystallizing in the smaller airflow area of ​​the ejection slot 211 and forming a crystal layer.

[0073] When air is blown into the slurry from the ejection slot 211, it also pushes the windward blade 42 to rotate the rotating rod 4 continuously, so that the driving blade 41 on the rotating rod 4 rotates continuously to drive the slurry at the bottom of the absorption tower 1 to flow, and the load-bearing ring seat 6 rotates coaxially and in the opposite direction with the rotating rod 4, and the load-bearing ring seat 6 rotates in the opposite direction with the rotating rod 4 to offset the torsional force applied by the rotating rod 4 to the movable seat 3, and the contact portion 61 of the load-bearing ring seat 6 drives the cleaning block 5 to perform vertical reciprocating shaking, thereby causing a collision and a gap between the cleaning block 5 and the inclined push slope 2111, so that the crystal layer on the inclined push slope 2111 is scraped by the cleaning block 5 and discharged by the impact of the gas;

[0074] When the oxidation blower blows a large amount of air into the blast pipe 21, the movable seat 3 is driven to move relatively away to the farthest position and completely expose the ejection slot 211. At this time, the cleaning block 5 is pushed by the inclined push slope 2111 and slides vertically to the lowest vertical position. At this time, the sliding portion 53 is located at the lowest position of the vertical slide slot 31, and part of the worm gear portion 54 is coupled with the worm portion 43. When the rotating rod 4 is driven to rotate by the airflow, the worm portion 43 rotates and drives the sliding portion 53 to move into the arc-shaped slide slot 32, and the cleaning block 5 is driven to slide and rotate in an inclined state, such as Fig.12As shown, when the cleaning block 5 is inclined, the first end of the cleaning block 5 is inclined to abut against the inclined push slope 2111 so that a gap is formed between the inclined push slope 2111 and the inclined abutting surface 51, and the narrow mouth of the secondary spray slot 52 is inclined toward the inclined push slope 2111. At this time, most of the air in the blast pipe 21 is vertically blown into the slurry along the ejection slot 211, and a small part of the air flows out along the secondary spray slot 52 and then moves along the inclined push slope 2111 and moves vertically upwards toward the ejection slot 211, so that when the ejection slot 211 is opened to the maximum, the gas is divided into two streams and ejected separately and collided alternately, so that the air bubbles ejected into the slurry collide with each other and the bubble volume is further reduced.

[0075] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A precise air volume control system for wet desulfurization and oxidation in a coal-fired power plant, comprising an absorption tower (1), characterized in that: It also includes an air blowing assembly (2) disposed in the absorption tower (1), wherein the air blowing assembly (2) includes: The blast pipe (21) has a symmetrically disposed ejection groove (211) at its end, and a first end of the ejection groove (211) is provided with an inclined push slope (2111); A movable seat (3) having a symmetrical piston slidably disposed in the blast pipe (21), wherein the movable seat (3) is driven by the wind pressure in the blast pipe (21) to slide relatively away to expose the ejection slot (211); A cleaning block (5) is symmetrically provided with a sliding portion (53), the sliding portion (53) being slidably arranged in a vertical sliding groove (31) provided on the movable seat (3), the first end of the cleaning block (5) being provided with an inclined contact surface (51), the movable seat (3) being driven to slide relatively so that the inclined contact surface (51) contacts the inclined push slope (2111) to slide, and the cleaning block (5) moves to scrape the inner wall of the ejection groove (211); The cleaning block (5) is provided with a secondary spraying slot (52), the narrow end of the secondary spraying slot (52) is connected to the inclined contact surface (51), and the wide end faces the inner side of the blast pipe (21), the movable seat (3) is driven to slide relatively away so that the inclined push slope (2111) pushes the cleaning block (5) to slide along the vertical slide groove (31), and the narrow end of the secondary spraying slot (52) moves toward the inclined push slope (2111); It also includes a first elastic member (91) whose two ends are respectively fixedly connected to the two movable seats (3) to pull the movable seats (3) to move relatively, close together and reset.

2. According to claim 1, a coal-fired power plant wet desulfurization oxidation air volume precision control system is characterized in that: It also includes a rotating rod (4) rotatably arranged on the movable seat (3), and driving blades (41) and windward blades (42) are arranged in a circumferential array at both ends of the rotating rod (4), the driving blades (41) are located outside the blast pipe (21), and the windward blades (42) are located inside the blast pipe (21), and the airflow in the blast pipe (21) is ejected along the ejection slot (211) to drive the windward blades (42) to drive the rotating rod (4) to rotate.

3. According to claim 2, a coal-fired power plant wet desulfurization oxidation air volume precision control system is characterized in that: It also includes a load-bearing ring seat (6) which is rotatably arranged in the movable seat (3) and is coaxial with the rotating rod (4) and rotates in the opposite direction.

4. According to claim 3, a coal-fired power plant wet desulfurization oxidation air volume precision control system is characterized in that: The load-bearing ring seat (6) is provided with contact portions (61) in a circumferential array, and the contact portions (61) are provided with inclined surfaces (611). The cleaning block (5) is provided with raised portions (56) in a linear array, and the raised portions (56) are provided with arc-shaped abutment surfaces (561) whose axes are parallel to and offset from the axes of the load-bearing ring seat (6).

5. According to claim 4, a coal-fired power plant wet desulfurization oxidation air volume precision control system is characterized in that: The invention also comprises a worm wheel (71), a first transmission gear (72) and a second transmission gear (73) rotatably arranged in the movable seat (3); the worm wheel (71) is coupled to a worm portion (43) arranged on the rotating rod (4); the first helical tooth portion (711) of the worm wheel (71) is coupled to the second helical tooth portion (721) of the first transmission gear (72); the first transmission gear (72) is coupled to the secondary ring gear (731) of the second transmission gear (73); and the second transmission gear (73) is coupled to the load ring seat (6).

6. A coal-fired power plant wet desulfurization oxidation air volume precision control system according to claim 5, characterized in that: The movable seat (3) is provided with an arc-shaped slide groove (32) whose two ends are both connected to the vertical slide groove (31), one end of the arc-shaped slide groove (32) is connected to the lowest position of the vertical slide groove (31), and the cleaning block (5) is provided with a partial worm gear portion (54). The movable seat (3) is driven to slide relatively away so that the cleaning block (5) slides along the vertical slide groove (31) until the partial worm gear portion (54) is coupled with the worm gear portion (43), and the rotating rod (4) keeps rotating to drive the sliding portion (53) into the arc-shaped slide groove (32) through the worm gear portion (43) and the partial worm gear portion (54), and the cleaning block (5) is inclined to contact the inclined push slope (2111) so that the narrow end of the secondary spray slot (52) is inclined toward the inclined push slope (2111).

7. A coal-fired power plant wet desulfurization oxidation air volume precision control system according to claim 2, characterized in that: The windward blades (42) are provided with a linear array of windward holes (421) in a through shape, and the openings at both ends of the windward holes (421) are respectively a wide hole and a narrow hole.

8. A coal-fired power plant wet desulfurization oxidation air volume precision control system according to claim 7, characterized in that: The cleaning block (5) is symmetrically provided with an extension portion (55) located in a movable groove (33) opened in the movable seat (3); a second elastic member (92) and a third elastic member (93) are provided in the movable groove (33), one end of which is connected to the extension portion (55) to drive the cleaning block (5) to slide and return to a vertical position.

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