Automatic ammonia adding device for condensate water of chemical feed water of thermal power plant

Abstract

The application discloses an automatic ammonia adding device for condensate water of chemical feed water of a thermal power plant. The automatic ammonia adding device comprises a box body, a motor, a feeding assembly and a driving assembly. The box body is provided with a drain pipe. The motor is installed on the box body. The feeding assembly is arranged in the box body and comprises a feeding pipe. The driving assembly is arranged in the box body and is connected with the motor and the feeding pipe. When the motor is started, the driving assembly drives the feeding pipe to move in a horizontal reciprocating linear motion and a rotating motion around the axis in the box body. The automatic ammonia adding device can realize active and forced stirring of the mixed liquid during the dosing process, dynamically change the adding point of the medicament, accelerate the mixing speed of ammonia water and condensate water and improve the mixing uniformity.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to an automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants. Background Technology

[0002] In thermal power plants, adding ammonia to feedwater and condensate is a key chemical treatment step for adjusting pH and preventing system corrosion. Related technologies utilize automated ammonia dosing systems based on online pH meter feedback, employing an intermittent batch dosing mode for automated control. Specifically, when the online pH meter detects that the pH value of the feedwater or condensate in the pipeline is below a set lower limit, the control system instructs the dosing pump to start, injecting a pre-calculated amount of ammonia solution into the condensate pipeline in one go or in batches. However, because the dosing action is static or simply dynamic (one-time injection), it results in slow mixing speed and poor mixing effect, leading to measurement errors and system control instability. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an automatic ammonia dosing device for condensate of chemical feedwater in thermal power plants, so as to facilitate uniform mixing of the reagents and the water to be treated.

[0005] An automatic ammonia dosing device for condensate in chemical feedwater of a thermal power plant, according to an embodiment of the present invention, includes: a housing, a motor, a feeding assembly, and a drive assembly. The housing is provided with a drain pipe. The motor is installed in the housing. The feeding assembly is arranged inside the housing and includes a feeding pipe. The drive assembly is arranged inside the housing and is connected to the motor and the feeding pipe, so that when the motor is started, the drive assembly drives the feeding pipe to reciprocate linearly in the horizontal direction and rotate around its own axis within the housing.

[0006] The automatic ammonia dosing device for condensate in chemical feedwater systems of thermal power plants, as described in this invention, utilizes a drive assembly to simultaneously perform horizontal reciprocating linear motion and rotational motion around an axis within the tank. This achieves active and forced stirring of the mixture during dosing and dynamically adjusts the dosing point. Therefore, the device accelerates the mixing speed of ammonia and condensate, improves mixing uniformity, and solves the problems of online pH meter measurement distortion and system control instability caused by uneven mixing in related technologies. This provides a guarantee for the stable operation of the feedwater treatment system in thermal power plants.

[0007] In some embodiments, the drive assembly includes a reciprocating lead screw, a mounting plate, a drive rod, a worm gear, a first sleeve, a worm wheel, and a transmission mechanism. The reciprocating lead screw is rotatably supported in the housing, and one end of the reciprocating lead screw is connected to the output shaft of the motor. The mounting plate is threaded onto the reciprocating lead screw. The feeding pipe is rotatably connected to the mounting plate. The drive rod is rotatably supported in the housing. The worm gear is fitted onto the drive rod and keyed to the drive rod, so that the worm gear rotates with the drive rod and slides axially on the drive rod. The first sleeve is fitted onto the feeding pipe. The worm wheel is fixed to the first sleeve and meshes with the worm gear. The transmission mechanism is located between the reciprocating lead screw and the drive rod to synchronously transmit the rotation of the reciprocating lead screw to the drive rod.

[0008] In some embodiments, the transmission mechanism includes a main wheel, a secondary wheel, and a belt. The main wheel is located at the end of the reciprocating lead screw, the secondary wheel is located at the end of the drive rod, and the belt is tensioned between the main wheel and the secondary wheel to make the main wheel and the secondary wheel rotate synchronously.

[0009] In some embodiments, the diameter of the main wheel is larger than the diameter of the secondary wheel.

[0010] In some embodiments, the feeding assembly further includes a second sleeve, a third sleeve, two L-shaped tubes, and an adjusting mechanism. The second sleeve is fitted onto the feeding tube, and the side wall of the second sleeve is provided with a feed pipe. The feeding tube is provided with a feed inlet at a position corresponding to the second sleeve. The third sleeve is fitted onto the bottom of the feeding tube. The two L-shaped tubes penetrate the side wall of the third sleeve and extend into the feeding tube. The adjusting mechanism is located inside the third sleeve to control the ammonia water to flow out from one or both of the two L-shaped tubes.

[0011] In some embodiments, the adjusting mechanism includes a sleeve, piston one, piston two, a U-shaped rod, a slider, and a limiting mechanism. The sleeve is coaxially arranged with the feeding tube, and the sleeve wall has a discharge port. Piston one and piston two are slidably and sealingly installed inside the sleeve and are respectively located on the upper and lower sides of the discharge port. The horizontal inlets of the two L-shaped tubes face into the sleeve, and the axial distance between the two inlets is equal to the length of piston one. The U-shaped rod is disposed between the sleeve and the slider. The outer surface of the feeding tube has a reciprocating thread, and the slider engages with the feeding tube through the reciprocating thread. The limiting mechanism is disposed between the slider and the driving assembly to restrict the slider to move only along the axial direction of the feeding tube.

[0012] In some embodiments, the limiting mechanism includes a fixing block, a mounting block, a connecting rod, and a limiting rod. The fixing block is rotatably sleeved on the worm gear, the mounting block is rotatably mounted on the first sleeve, the two ends of the connecting rod are respectively connected to the fixing block and the mounting block, and the limiting rod is disposed on the slider and slides through the mounting block.

[0013] In some embodiments, the two L-shaped tubes are arranged staggered in the vertical direction, wherein the height of the outlet end of the upper L-shaped tube is higher than the height of the outlet end of the lower L-shaped tube.

[0014] In some embodiments, when the feeding pipe rotates, the L-shaped tube at the lower end of the feeding pipe stirs the liquid inside the tank. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the automatic ammonia dosing device according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the drive component structure of the automatic ammonia dosing device according to an embodiment of the present invention.

[0017] Figure 3 This is a partial structural diagram of the feeding component of the automatic ammonia feeding device according to an embodiment of the present invention.

[0018] Figure 4 This is a detailed schematic diagram of the adjustment mechanism and the limiting mechanism of the automatic ammonia addition device according to an embodiment of the present invention.

[0019] Figure label:

[0020] 1-Box body; 11-Drainage pipe; 2-Motor; 3-Feeding assembly; 31-Feeding pipe; 311-Inlet; 312-Reciprocating thread; 32-Sleeve II; 321-Inlet pipe; 33-Sleeve III; 34-L-shaped pipe; 35-Adjusting mechanism; 351-Sleeve; 3511-Outlet; 352-Piston I; 353-Piston II; 354-U-shaped rod; 355-Slider; 356-Limiting mechanism; 3561-Fixing block; 3562-Mounting block; 3563-Connecting rod; 3564-Limiting rod; 4-Drive assembly; 41-Reciprocating lead screw; 42-Mounting plate; 43-Drive rod; 44-Worm gear; 45-Sleeve 1; 46-Worm wheel; 47-Transmission mechanism; 471-Main wheel; 472-Secondary wheel; 473-Belt. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to embodiments of the present invention is described below with reference to the accompanying drawings.

[0023] like Figures 1 to 4 As shown, the automatic ammonia dosing device for condensate of chemical feedwater in thermal power plants according to an embodiment of the present invention includes: a housing 1, a motor 2, a feeding assembly 3, and a drive assembly 4.

[0024] The housing 1 is equipped with a drain pipe 11, the motor 2 is installed in the housing 1, the feeding assembly 3 is arranged inside the housing 1, the feeding assembly 3 includes a feeding pipe 31, and the drive assembly 4 is arranged inside the housing 1. The drive assembly 4 is connected to the motor 2 and the feeding pipe 31 so that when the motor 2 is started, the drive assembly 4 drives the feeding pipe 31 to reciprocate linearly in the horizontal direction and rotate around its own axis inside the housing 1.

[0025] The tank 1 is used to contain and mix the condensate from the feedwater. A drain pipe 11 is provided on the side wall of the tank 1 for discharging the mixed water. The motor 2 serves as the power source and is fixedly installed on the upper part or at a suitable external location of the tank 1. The feeding assembly 3 is located inside the tank 1. The core component of the feeding assembly 3 is the feeding pipe 31, which is used to introduce ammonia into the condensate inside the tank 1. The drive assembly 4 is also located inside the tank 1 and is connected to both the motor 2 and the feeding pipe 31 of the feeding assembly 3.

[0026] The specific connection and transmission relationship of the drive component 4 is that when the motor 2 is powered on and started, the drive component 4 receives the rotational power output by the motor 2 and converts it into a compound action to drive the feeding pipe 31 to move. The compound action includes two simultaneous and independent motion components.

[0027] For example, the drive assembly 4 drives the feed pipe 31 to reciprocate linearly in the horizontal direction inside the housing 1, allowing the feed pipe 31 to move back and forth periodically along the length of the housing 1, thereby expanding the coverage area of ​​ammonia addition and preventing the reagent from accumulating locally in a single location. Simultaneously, the drive assembly 4 drives the feed pipe 31 to rotate continuously around its own central axis, making the feed pipe 31 itself a moving component in the liquid, capable of directly disturbing the surrounding fluid.

[0028] With the coordinated drive of the drive component 4, the feeding pipe 31 performs the above-mentioned horizontal reciprocating linear motion and rotational motion around the axis when the motor 2 is working, which makes the movement trajectory of the feeding pipe 31 in the box 1 more complex. The movement range of the feeding pipe 31 covers a larger horizontal area, and its own rotation also generates a continuous shearing and stirring effect on the fluid.

[0029] Understandably, when the automatic ammonia dosing device is working, the condensate to be treated enters tank 1 through the inlet. Motor 2 starts, driving the feed pipe 31 to begin a compound motion via drive assembly 4. Ammonia water is introduced into tank 1 through feed assembly 3 (specifically via feed pipe 31). Because feed pipe 31 simultaneously performs horizontal reciprocating movement and rotation, the ammonia water flowing out of feed pipe 31 is no longer statically injected into a fixed point, but rather dispersed by a release point that continuously moves and rotates in space. The horizontal movement of feed pipe 31 causes its release position to constantly change, while its own rotation acts like a stirring paddle, continuously agitating the surrounding condensate water during the movement.

[0030] Therefore, the dynamic addition method of the feed pipe 31 enhances the contact and mixing efficiency between ammonia water and condensate, breaks the local high concentration zone caused by traditional static dosing, and promotes the rapid and uniform diffusion of the agent throughout the entire tank volume.

[0031] The automatic ammonia dosing device for condensate in the chemical feedwater system of thermal power plants, according to an embodiment of the present invention, uses a drive component 4 to enable the dosing pipe 31 to simultaneously perform horizontal reciprocating linear motion and rotational motion around an axis within the housing 1. This achieves active and forced stirring of the mixture during the dosing process and dynamically adjusts the dosing point. Therefore, the device accelerates the mixing speed of ammonia and condensate, improves mixing uniformity, and solves the problems of online pH meter measurement distortion and system control instability caused by uneven mixing in related technologies, thus ensuring the stable operation of the feedwater treatment system in thermal power plants.

[0032] In some embodiments, such as Figure 1 and Figure 2 As shown, the drive assembly 4 includes a reciprocating lead screw 41, a mounting plate 42, a drive rod 43, a worm gear 44, a sleeve 45, a worm wheel 46, and a transmission mechanism 47.

[0033] The reciprocating screw 41 is rotatably supported inside the housing 1. One end of the reciprocating screw 41 is connected to the output shaft of the motor 2. The mounting plate 42 is threaded onto the reciprocating screw 41. The feeding pipe 31 is rotatably connected to the mounting plate 42. The drive rod 43 is rotatably supported inside the housing 1. The worm gear 44 is fitted onto the drive rod 43 and keyed to the drive rod 43 so that the worm gear 44 rotates with the drive rod 43 and slides axially on the drive rod 43. The sleeve 45 is fitted onto the feeding pipe 31. The worm wheel 46 is fixed to the sleeve 45 and meshes with the worm gear 44. The transmission mechanism 47 is located between the reciprocating screw 41 and the drive rod 43 to synchronously transmit the rotation of the reciprocating screw 41 to the drive rod 43.

[0034] The reciprocating screw 41 is rotatably mounted inside the housing 1 via bearings or a similar support structure. The axis of the reciprocating screw 41 is parallel to the horizontal direction in which the feeding pipe 31 is required to perform reciprocating motion. One end of the reciprocating screw 41 is connected to the output shaft of the motor 2 via a coupling or direct connection, thereby directly receiving the rotational power provided by the motor 2.

[0035] The mounting plate 42 is threadedly engaged with the external thread on the reciprocating screw 41 through its internal threaded hole, meaning the mounting plate 42 is fitted onto the reciprocating screw 41. When the reciprocating screw 41 rotates, due to the threaded engagement, the mounting plate 42 moves linearly along the axis of the reciprocating screw 41. Because the thread of the reciprocating screw 41 is designed as a reciprocating thread, meaning the thread lead direction changes periodically, the motion trajectory of the mounting plate 42 is a periodic reciprocating linear motion.

[0036] The upper end of the feeding tube 31 is rotatably connected to the mounting plate 42 through a structure such as a bearing or a sliding sleeve. The feeding tube 31 can rotate freely relative to the mounting plate 42. The horizontal position of the feeding tube 31 follows the mounting plate 42 to perform reciprocating linear motion along the axis of the reciprocating screw 41, thereby realizing the driving of the horizontal reciprocating linear motion of the feeding tube 31.

[0037] The drive rod 43 is rotatably supported within the housing 1 by bearings, and the axis of the drive rod 43 is parallel to the reciprocating lead screw 41. The worm gear 44 is fitted onto the drive rod 43, and the two are connected by a key, such as a flat key or spline, so that the worm gear 44 can rotate securely with the drive rod 43, while allowing the worm gear 44 to slide axially within a certain range on the axis of the drive rod 43.

[0038] The sleeve 45 is fixedly fitted onto the upper part of the feed tube 31, with no relative rotation between the sleeve 45 and the feed tube 31. The worm gear 46 is fixedly mounted on the sleeve 45, for example, by bolting or welding. The worm gear 46 meshes with the worm 44 to form a worm gear pair.

[0039] The transmission mechanism 47 is located between the reciprocating lead screw 41 and the drive rod 43, and synchronously transmits the rotational motion of the reciprocating lead screw 41 to the drive rod 43, thereby enabling the drive rod 43 to rotate.

[0040] Understandably, after motor 2 starts, it drives the reciprocating screw 41 to rotate, which, through its threaded engagement with the mounting plate 42, drives the mounting plate 42 to perform horizontal reciprocating linear motion. The mounting plate 42 drives the feeding tube 31, which is rotatably connected to it, to perform horizontal reciprocating linear motion synchronously. The rotation of the reciprocating screw 41 is simultaneously transmitted to the drive rod 43 through the transmission mechanism 47. The drive rod 43 begins to rotate, and the rotating drive rod 43 drives the worm gear 44 to rotate synchronously through a key connection. The rotating worm gear 44 drives the worm wheel 46, which meshes with it, to rotate. Since the worm wheel 46 is fixedly mounted on the sleeve 45, and the sleeve 45 is fixedly fitted onto the feeding tube 31, the rotation of the worm wheel 46 ultimately drives the feeding tube 31 to rotate around its own axis.

[0041] It should be noted that since the mounting plate 42 is making reciprocating linear motion, the feed tube 31, which is connected to it via a bearing, will also move accordingly. The worm 44 and the drive rod 43 are keyed together, allowing axial sliding. Therefore, even if the horizontal movement of the feed tube 31 (via the mounting plate 42) causes a change in the position of the meshing worm wheel 46, the worm 44 can slide on the drive rod 43 to adapt to the position change, always maintaining effective meshing with the worm wheel 46 and ensuring the continuity of the feed tube 31's rotational movement.

[0042] In some embodiments, such as Figure 2 As shown, the transmission mechanism 47 includes a main wheel 471, a secondary wheel 472, and a belt 473. The main wheel 471 is located at the end of the reciprocating screw 41, the secondary wheel 472 is located at the end of the drive rod 43, and the belt 473 is tensioned between the main wheel 471 and the secondary wheel 472 so that the main wheel 471 and the secondary wheel 472 rotate synchronously.

[0043] The main wheel 471 is fixedly mounted on the end of the reciprocating screw 41. For example, the main wheel 471 can be fixed to the rotation axis of the reciprocating screw 41 by means of key connection or flange connection to ensure that the two rotate synchronously. The auxiliary wheel 472 is fixedly mounted on the corresponding end of the drive rod 43 in the same way. The axes of the main wheel 471 and the auxiliary wheel 472 are parallel and they are aligned in space to facilitate transmission connection.

[0044] Belt 473 is fitted onto the main pulley 471 and the auxiliary pulley 472, and is maintained at a proper tension by a tensioning device (such as an adjustable tensioner or by adjusting the installation position). Belt 473 can be a synchronous belt (such as a toothed belt), a V-belt, or a flat belt, the choice of which depends on the required transmission accuracy and power. Belt 473 is tensioned between the main pulley 471 and the auxiliary pulley 472, forming a complete belt drive circuit.

[0045] Understandably, when motor 2 drives reciprocating screw 41 to rotate, the main wheel 471 fixed to the end of reciprocating screw 41 rotates synchronously. The rotation of the main wheel 471 transmits power to the auxiliary wheel 472 through a tensioned belt 473 via friction or meshing. Due to the tension of the belt 473, the auxiliary wheel 472 is forced to rotate synchronously with the main wheel 471. The rotation of the auxiliary wheel 472 directly drives the drive rod 43, which is fixedly connected to it, to rotate.

[0046] Through the transmission mechanism 47, the rotational motion of the reciprocating screw 41 is efficiently and smoothly transmitted synchronously to the drive rod 43, ensuring that the rotational speed of the drive rod 43 and the rotational speed of the reciprocating screw 41 maintain a fixed proportional relationship (depending on the diameter ratio of the main wheel 471 and the auxiliary wheel 472). Therefore, a stable mechanical synchronization is established between the horizontal reciprocating motion of the feed pipe 31 (determined by the rotational speed of the reciprocating screw 41) and its rotational motion (ultimately determined by the rotational speed of the drive rod 43).

[0047] Optionally, such as Figure 2 As shown, the diameter of the main wheel 471 is larger than the diameter of the secondary wheel 472.

[0048] That is, when the diameter of the driving wheel (main wheel 471) is larger than the diameter of the driven wheel (secondary wheel 472), the rotational speed of the driven wheel will be higher than that of the driving wheel. The rotational speed of the drive rod 43 is increased to be higher than that of the reciprocating screw 41. The rotational speed of the drive rod 43 determines the rotational speed of the worm gear 44, which in turn determines the rotational speed of the feed tube 31 through the worm gear pair. Therefore, the diameter of the main wheel 471 is larger than the diameter of the secondary wheel 472, making the rotational speed of the feed tube 31 higher than the speed of its horizontal reciprocating drive source (reciprocating screw 41).

[0049] In some embodiments, such as Figure 1 and Figure 3 As shown, the feeding assembly 3 also includes a second sleeve 32, a third sleeve 33, two L-shaped tubes 34, and an adjustment mechanism 35.

[0050] The second sleeve 32 is fitted onto the feeding pipe 31. The side wall of the second sleeve 32 is provided with a feed pipe 321. The feeding pipe 31 is provided with a feed port 311 at the position corresponding to the second sleeve 32. The third sleeve 33 is fitted onto the bottom of the feeding pipe 31. Two L-shaped pipes 34 penetrate the side wall of the third sleeve 33 and extend into the feeding pipe 31. The adjusting mechanism 35 is provided inside the third sleeve 33 to control the ammonia water to flow out from one or both of the two L-shaped pipes 34.

[0051] The second sleeve 32 is fitted onto the upper or middle part of the feed pipe 31. A feed pipe 321 is connected to the side wall of the second sleeve 32, which is used to connect to an external ammonia source (such as an ammonia storage tank or dosing pump). One or more feed ports 311 are provided on the wall of the feed pipe 31, corresponding to the position where the second sleeve 32 is fitted. The feed ports 311 connect the internal cavity of the feed pipe 31 with the internal cavity of the second sleeve 32. Ammonia water enters the second sleeve 32 through the external pipeline via the feed pipe 321, and then flows into the internal channel of the feed pipe 31 through the feed ports 311.

[0052] The sleeve 33 is fixedly fitted onto the bottom or lower end of the feeding tube 31. The sleeve 33 and the feeding tube 31 are usually fixed by welding or fasteners to ensure that there is no relative displacement between the two during movement.

[0053] Two L-shaped pipes 34 penetrate the side wall of sleeve 33 and extend into the interior of feed pipe 31. One end of the L-shaped pipe 34 (horizontal section inlet) is located in the internal cavity of feed pipe 31, and the other end (vertical section outlet) passes through the side wall of sleeve 33 and extends into the liquid inside tank 1. The two L-shaped pipes 34 constitute two outlet channels for ammonia water to flow from the inside of feed pipe 31 to the condensate inside tank 1.

[0054] The regulating mechanism 35 is located inside the casing 33 or integrated with the casing 33. Depending on the operating status of the device, the regulating mechanism 35 periodically changes the path of ammonia water outflow, controlling the ammonia water to selectively flow out from one of the two L-shaped pipes 34, or simultaneously flow out from both L-shaped pipes 34.

[0055] Understandably, ammonia water is continuously or intermittently supplied to sleeve 32 via feed pipe 321 through an external system. Because of the inlet 311 between sleeve 32 and feed pipe 31, ammonia water can enter the internal cavity of feed pipe 31. Driven by drive assembly 4, feed pipe 31 undergoes a combined horizontal reciprocating movement and rotation. The ammonia water entering feed pipe 31 flows downwards to the bottom of sleeve 33 region under gravity or slight pressure.

[0056] The regulating mechanism 35 is located in this area and dynamically guides the flow of ammonia. Based on the periodic positional changes of the internal components of the regulating mechanism 35, ammonia is allowed to flow to the horizontal inlet of one of the L-shaped pipes 34, or simultaneously to both inlets. The ammonia flows out from the vertical outlet of the guided L-shaped pipe 34 and into the condensate within the tank 1.

[0057] Because the feed pipe 31 itself is in motion, the L-shaped pipe 34, as a fixed part of it, also moves accordingly. Therefore, the injection point of ammonia water is not a static fixed point, but a point that dynamically changes in three-dimensional space due to the combined movement of the feed pipe 31. At the same time, the outlet of the L-shaped pipe 34 itself is also a moving part, generating additional disturbance to the surrounding liquid.

[0058] In some embodiments, such as Figure 3 and Figure 4 As shown, the adjusting mechanism 35 includes a sleeve 351, a first piston 352, a second piston 353, a U-shaped rod 354, a slider 355, and a limiting mechanism 356.

[0059] The sleeve 351 is coaxially arranged with the feeding tube 31. The sleeve 351 has a discharge port 3511 on its wall. Piston 1 352 and piston 2 353 are slidably and sealingly installed inside the sleeve 351 and are located on the upper and lower sides of the discharge port 3511 respectively. The horizontal inlets of the two L-shaped tubes 34 face the inside of the sleeve 351 respectively, and the axial distance between the two inlets is equal to the length of piston 1 352. The U-shaped rod 354 is located between the sleeve 351 and the slider 355. The outer surface of the feeding tube 31 is provided with a reciprocating thread 312. The slider 355 cooperates with the feeding tube 31 through the reciprocating thread 312. The limiting mechanism 356 is located between the slider 355 and the drive assembly 4 to limit the slider 355 to move only along the axial direction of the feeding tube 31.

[0060] The sleeve 351 is a cylindrical structure with an open top. The axis of the sleeve 351 coincides with the axis of the feed pipe 31, i.e., it is coaxially arranged. The sleeve 351 is fixedly installed inside the sleeve 33 or is integrally formed with the sleeve 33. A discharge port 3511 is opened on the cylindrical wall of the sleeve 351. The discharge port 3511 connects the interior of the sleeve 351 with the interior of the feed pipe 31, and is the only inlet for ammonia water to enter the sleeve 351 from the main channel of the feed pipe 31.

[0061] Piston 352 and piston 353 are two sliding seals, which can be, for example, metal parts with a rubber sealing ring or piston ring structure. They are slidably and sealingly mounted on the inner wall of sleeve 351, and can slide axially within sleeve 351 while maintaining a seal to prevent ammonia from leaking out in large quantities from the gap between them and the sleeve wall. Piston 352 and piston 353 are located above and below discharge port 3511, respectively; that is, discharge port 3511 is sandwiched between these two pistons.

[0062] The horizontal inlets of the two L-shaped tubes 34 (i.e., the ends that extend into the feed tube 31) face the interior of the sleeve 351, and there is a gap between the two inlets in the axial direction of the sleeve 351. The axial distance between the horizontal inlets of the two L-shaped tubes 34 is equal to the length of the piston-352 (or the axial dimension of the piston-352).

[0063] One end of the U-shaped rod 354 is fixedly connected to the outer wall or bottom of the sleeve 351, and the other end is fixedly connected to the slider 355. Therefore, the sleeve 351 and the slider 355 are rigidly connected through the U-shaped rod 354.

[0064] A reciprocating thread 312 is machined on the outer surface of the feed tube 31. The direction of the helix angle of the reciprocating thread 312 changes periodically, so that the nut (or slider) that mates with it does not move continuously in one direction during rotational relative motion, but rather makes a reciprocating axial movement. The slider 355 has a threaded structure or protrusion inside that matches the reciprocating thread 312, so that it can engage with the reciprocating thread 312, that is, the slider 355 mates with the feed tube 31 through the reciprocating thread 312.

[0065] The limiting mechanism 356 is disposed between the slider 355 and the drive assembly 4. The limiting mechanism 356 restricts the motion freedom of the slider 355, preventing it from rotating with the rotation of the feeding tube 31, but allowing it to move freely in the axial direction of the feeding tube 31.

[0066] Understandably, ammonia water flows into the feed pipe 31 through the inlet 311 and collects downwards. When the ammonia water reaches the sleeve 351 area, it enters the internal chamber of the sleeve 351 through the outlet 3511.

[0067] The feeding tube 31 rotates continuously under the drive of the drive assembly 4. Since the slider 355 engages with the rotating feeding tube 31 via the reciprocating thread 312 and is restricted from rotation by the limiting mechanism 356, a relative rotation occurs between the rotating feeding tube 31 and the stationary (non-rotating) slider 355. This relative rotation, due to the presence of the reciprocating thread 312, is converted into a reciprocating linear motion of the slider 355 along the axis of the feeding tube 31. The slider 355 moves upwards or downwards.

[0068] The reciprocating movement of slider 355 drives sleeve 351 to reciprocate axially synchronously via U-shaped rod 354. Since piston 1 352 and piston 2 353 are slidably and sealingly installed inside sleeve 351, they will move together with sleeve 351 or move relative to the fixed inlet of L-shaped tube 34.

[0069] As the sleeve 351 (along with piston 352 and piston 353) reciprocates, the positional relationship of the internal chamber of the sleeve 351 relative to the horizontal inlets of the two fixed L-shaped tubes 34 changes periodically: When the sleeve 351 moves to a certain position, piston 1 352 may just block the inlet of the upper L-shaped tube 34, while piston 2 353 does not block the lower inlet. At this time, ammonia water only flows out from the lower L-shaped tube 34.

[0070] When sleeve 351 moves to another position, piston 2 353 may block the lower inlet, while piston 1 352 does not block the upper inlet, and ammonia water only flows out from the upper L-shaped pipe 34.

[0071] When the sleeve 351 moves to the middle position, neither piston blocks the inlet, and ammonia water flows out from both L-shaped pipes 34 at the same time.

[0072] Since the distance between the two inlets is equal to the length of piston 352, piston 352 can sequentially cover (block or open) the two inlets during one reciprocating stroke.

[0073] In some embodiments, such as Figure 4 As shown, the limiting mechanism 356 includes a fixed block 3561, a mounting block 3562, a connecting rod 3563, and a limiting rod 3564. The fixed block 3561 is rotatably sleeved on the worm gear 44, the mounting block 3562 is rotatably mounted on the sleeve 45, the two ends of the connecting rod 3563 are respectively connected to the fixed block 3561 and the mounting block 3562, and the limiting rod 3564 is provided on the slider 355 and slides through the mounting block 3562.

[0074] The fixing block 3561 is a ring-shaped or block-shaped component. A hole is provided in the center of the fixing block 3561 to allow it to be rotatably fitted onto the worm 44 of the drive assembly 4. The fixing block 3561 can rotate freely relative to the worm 44, but changes in the axial position of the worm 44 (due to its keyed connection with the drive rod 43 allowing sliding) will cause the fixing block 3561 to move axially along with it. The rotatable connection between the fixing block 3561 and the worm 44 is typically achieved through a sliding bearing or clearance fit.

[0075] Mounting block 3562 is a support component and is rotatably mounted on sleeve 45. For example, mounting block 3562 can be mounted on the outer surface of sleeve 45 or on an extended bracket via a bearing or bushing, allowing it to rotate freely relative to sleeve 45 (i.e. relative to feed tube 31).

[0076] The connecting rod 3563 is a rigid member, and its two ends are connected to the fixing block 3561 and the mounting block 3562, respectively. The connection method can be threaded connection, welding, or hinged connection. The function of the connecting rod 3563 is to connect the fixing block 3561 and the mounting block 3562 into an integral frame and to transmit the axial position information of the worm gear 44 to the area where the mounting block 3562 is located.

[0077] The limiting rod 3564 is a straight rod, with one end fixedly mounted on the slider 355, for example, by welding or bolting. The other end of the limiting rod 3564 slidably passes through the mounting block 3562. Specifically, the mounting block 3562 has a smooth through hole or guide sleeve through which the limiting rod 3564 passes, forming a sliding fit that allows the limiting rod 3564 to slide freely axially within the hole, but not to rotate relative to it.

[0078] Understandably, the feeding tube 31 rotates under the drive of the drive assembly 4. Since the slider 355 engages with the reciprocating thread 312 on the outer surface of the feeding tube 31 through its internal thread structure, if the slider 355 is unrestrained, it will attempt to rotate with the feeding tube 31.

[0079] However, the limiting rod 3564 is fixedly connected to the slider 355 and slides through the mounting block 3562. The mounting block 3562 is connected to the fixing block 3561 via the connecting rod 3563, and the fixing block 3561 is sleeved on the worm gear 44. The worm gear 44 itself is driven to rotate by the drive rod 43 and allows axial sliding.

[0080] Mounting block 3562 is designed to rotate freely relative to sleeve 45 (which rotates with feed tube 31). Therefore, when feed tube 31 rotates, mounting block 3562 is not forced to rotate; it can remain stationary or rotate slowly (depending on friction). More importantly, the limiting rod 3564 and mounting block 3562 are in a sliding fit, allowing only axial movement and prohibiting relative rotation.

[0081] Therefore, when the feed tube 31 rotates, its tendency to rotate the slider 355 is prevented by the sliding fit (preventing rotation) between the limit rod 3564 and the mounting block 3562. The slider 355 is effectively limited and cannot rotate.

[0082] Meanwhile, since the fixing block 3561 is fitted onto the worm gear 44, and the worm gear 44 slides axially on the drive rod 43 as the feeding pipe 31 reciprocates horizontally, the entire limiting mechanism 356 (fixing block 3561, connecting rod 3563, mounting block 3562) can move as a whole along with the horizontal movement of the feeding pipe 31, thereby always maintaining the alignment and cooperation between the limiting rod 3564 and the mounting block 3562, and will not disengage or interfere due to the horizontal displacement of the feeding pipe 31.

[0083] In some embodiments, such as Figure 3 and Figure 4 As shown, the two L-shaped tubes 34 are staggered in the vertical direction, wherein the outlet end of the upper L-shaped tube 34 is higher than the outlet end of the lower L-shaped tube 34.

[0084] Both L-shaped pipes 34 penetrate the side wall of sleeve 33, and their vertical sections (outlet sections) extend into the liquid inside the tank 1. The two L-shaped pipes 34 are not at the same height in the vertical direction, but are staggered.

[0085] Specifically, one L-shaped tube 34 is defined as being located above, and the other as being located below. The outlet end (i.e., the lowest opening of the vertical section) of the upper L-shaped tube 34 is designed to be at a higher height than the outlet end of the lower L-shaped tube 34. The height difference can be achieved by setting the vertical section lengths of the two L-shaped tubes 34 to be different during manufacturing, or by setting their installation positions on the sleeve 33 to be at different heights.

[0086] The reciprocating movement of sleeve 351 controls which L-shaped pipe 34 the ammonia water flows out from. When the ammonia water is directed and flows out from the upper L-shaped pipe 34, the reagent is injected into a relatively high depth level of the liquid in tank 1. When the ammonia water is directed and flows out from the lower L-shaped pipe 34, the reagent is injected into a relatively low depth level. When both outlets are open simultaneously, the reagent is injected into two different depth levels at the same time.

[0087] Due to the height difference between the two outlets, the initial injection position of ammonia water in tank 1 changes in the vertical direction, breaking the traditional pattern that the agent is always injected from the same depth when adding chemicals through a single outlet.

[0088] In some embodiments, when the feeding pipe 31 rotates, the L-shaped pipe 34 at the lower end of the feeding pipe 31 stirs the liquid in the tank body 1.

[0089] The structure of the L-shaped tube 34 extends its vertical section (outlet section) into the liquid inside the tank 1. When the feed pipe 31 drives the L-shaped tube 34 to rotate, the vertical section of the L-shaped tube 34 moves in the liquid, and its tube body exerts a direct physical effect on the surrounding fluid.

[0090] The rotating L-shaped tube 34 moves in a manner similar to a paddle or stirring rod in a mixing device. During rotation, the tube wall of the L-shaped tube 34 pushes and shears the surrounding liquid, generating local eddies and velocity gradients, breaking the static or laminar state of the liquid, and promoting macroscopic circulation and microscopic mixing of the liquid.

[0091] More importantly, the stirring action is synchronous and originates from the same source as the dosing process. The power for stirring comes from the same motor 2 and drive assembly 4 that drives the feed pipe 31 to rotate, and the stirring actuator (L-shaped pipe 34) is also the outlet of the agent. That is, at the moment when ammonia water flows out of the outlet of L-shaped pipe 34, the outlet itself is violently stirring the surrounding liquid environment, thereby facilitating the rapid diffusion of the agent.

[0092] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0095] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0096] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants, characterized in that, include: The container includes a housing, a motor, a feeding assembly, and a drive assembly. The housing is equipped with a drain pipe. The motor is mounted in the housing. The feeding assembly, which includes a feeding pipe, is arranged inside the housing. The drive assembly is arranged inside the housing and connected to the motor and the feeding pipe, so that when the motor is started, the drive assembly drives the feeding pipe to reciprocate linearly in the horizontal direction and rotate around its own axis within the housing.

2. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 1, characterized in that, The drive assembly includes a reciprocating lead screw, a mounting plate, a drive rod, a worm gear, a sleeve, a worm wheel, and a transmission mechanism. The reciprocating lead screw is rotatably supported in the housing, and one end of the reciprocating lead screw is connected to the output shaft of the motor. The mounting plate is threaded onto the reciprocating lead screw. The feeding pipe is rotatably connected to the mounting plate. The drive rod is rotatably supported in the housing. The worm gear is fitted onto the drive rod and keyed to the drive rod, so that the worm gear rotates with the drive rod and slides axially on the drive rod. The sleeve is fitted onto the feeding pipe. The worm wheel is fixed to the sleeve and meshes with the worm gear. The transmission mechanism is located between the reciprocating lead screw and the drive rod to synchronously transmit the rotation of the reciprocating lead screw to the drive rod.

3. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 2, characterized in that, The transmission mechanism includes a main wheel, a secondary wheel, and a belt. The main wheel is located at the end of the reciprocating lead screw, the secondary wheel is located at the end of the drive rod, and the belt is tensioned between the main wheel and the secondary wheel to make the main wheel and the secondary wheel rotate synchronously.

4. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 3, characterized in that, The diameter of the main wheel is larger than the diameter of the secondary wheel.

5. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 2, characterized in that, The feeding assembly also includes a second sleeve, a third sleeve, two L-shaped tubes, and an adjustment mechanism. The second sleeve is fitted onto the feeding tube, and the side wall of the second sleeve is provided with a feed pipe. The feeding tube is provided with a feed inlet at a position corresponding to the second sleeve. The third sleeve is fitted onto the bottom of the feeding tube. The two L-shaped tubes penetrate the side wall of the third sleeve and extend into the feeding tube. The adjustment mechanism is located inside the third sleeve to control the ammonia water to flow out from one or both of the two L-shaped tubes.

6. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 5, characterized in that, The adjusting mechanism includes a sleeve, piston one, piston two, a U-shaped rod, a slider, and a limiting mechanism. The sleeve is coaxially arranged with the feeding tube, and the sleeve wall has a discharge port. Piston one and piston two are slidably and sealingly installed inside the sleeve and are located on the upper and lower sides of the discharge port, respectively. The horizontal inlets of the two L-shaped tubes face into the sleeve, and the axial distance between the two inlets is equal to the length of piston one. The U-shaped rod is located between the sleeve and the slider. The outer surface of the feeding tube has a reciprocating thread, and the slider engages with the feeding tube through the reciprocating thread. The limiting mechanism is located between the slider and the driving assembly to restrict the slider to move only along the axial direction of the feeding tube.

7. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 6, characterized in that, The limiting mechanism includes a fixed block, a mounting block, a connecting rod, and a limiting rod. The fixed block is rotatably sleeved on the worm gear, the mounting block is rotatably mounted on the sleeve, the two ends of the connecting rod are respectively connected to the fixed block and the mounting block, and the limiting rod is located on the slider and slides through the mounting block.

8. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to claim 6, characterized in that, The two L-shaped tubes are staggered in the vertical direction, wherein the outlet end of the upper L-shaped tube is at a higher height than the outlet end of the lower L-shaped tube.

9. The automatic ammonia dosing device for condensate in chemical feedwater of thermal power plants according to any one of claims 1-8, characterized in that, When the feeding pipe rotates, the L-shaped tube at the lower end of the feeding pipe stirs the liquid inside the tank.

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