Waste heat boiler blow-down water recovery device and method

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a waste heat boiler blow-down water recovery device and method.The device comprises a boiler, a slurry pump, a stirring tank and a gas storage tank which are communicated through pipelines; the stirring tank comprises a stirring assembly arranged in the stirring tank and a motor used for driving the stirring assembly; the stirring assembly comprises a first driving rod, the first driving rod is of a hollow structure, the first driving rod is connected with the output end of the motor, and the first driving rod communicates with an air storage tank through a rotating joint; the second driving rod is of a hollow structure, and the second driving rod communicates with the first driving rod; the first stirring rods are of hollow structures, the number of the first stirring rods is two, and the first stirring rods communicate with the first driving rod and the second driving rod correspondingly; the second stirring rod is of a hollow structure, the second stirring rod is arranged in the first stirring rod and communicates with the first stirring rod, and a plurality of spraying holes are formed in the second stirring rod; the problem of insufficient reaction of carbon dioxide and grey water is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to a waste heat boiler sewage recovery device and method. Background Art

[0002] Boiler ash water is a mixture of unburned ash and cooling water from coal-fired or oil-fired boilers. It contains high concentrations of suspended solid waste and hazardous substances and is classified as industrial wastewater. Recycling ash water purifies these hazardous substances and meets environmental standards.

[0003] The grey water treatment process includes adjusting the pH to optimize the addition of flocculants, promoting the precipitation of suspended matter, accelerating the removal of hardness such as calcium carbonate and magnesium by the introduction of carbon dioxide, and enhancing the precipitation of flocculants to integrate large particles, accelerate sedimentation, and enhance filtration and clarification, ultimately ensuring that the treated water quality meets the discharge standards.

[0004] Referring to the document with the existing publication (announcement) number CN117401797A, a boiler ash water treatment and reuse device is disclosed. By arranging a combined power shaft, spiral blades, an aeration component and a buffer component, the downward vortex of the ash water inside the sedimentation tank body and the upward surging reaction gas are realized. The two offset each other to achieve the reaction between the ash water and the gas.

[0005] The vortex grey water reacts with the upward surging gas in order to enhance the mixing of the two through vortex and gas surge. However, the high-speed rotating flow caused by the vortex will cause the carbon dioxide to be unevenly distributed in the grey water, often forming larger bubbles instead of small bubble groups, thereby reducing the contact area between the carbon dioxide and the grey water and failing to make the two react more fully. Furthermore, since the reaction of carbon dioxide with grey water mainly depends on the size of the bubbles and the residence time of the gas in the grey water, large bubble ash rises rapidly and escapes the water surface, reducing the reaction time with the grey water. In addition, the vortex will disturb the sediment in the sedimentation tank, causing the sediment to re-suspend. Therefore, it is not ideal to promote the mixing of carbon dioxide and gas by vortex. Summary of the invention

[0006] The purpose of this scheme is to provide a waste heat boiler wastewater recovery device to solve the problem of insufficient reaction between carbon dioxide and ash water.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a waste heat boiler wastewater recovery device, comprising a boiler, a slurry pump, a stirring tank and a gas storage tank connected by pipelines from left to right, wherein carbon dioxide is arranged in the gas storage tank; the stirring tank comprises a stirring assembly arranged in the stirring tank and a motor for driving the stirring assembly; the stirring assembly comprises: A first driving rod, which is a hollow structure, is connected to an output end of the motor, and is connected to the gas storage tank via a rotary joint; A second driving rod, the second driving rod is a hollow structure, and the second driving rod is connected to the first driving rod; A first stirring rod, wherein the first stirring rod is a hollow structure, and the first stirring rod is in two groups, and is respectively connected to the first driving rod and the second driving rod; The second stirring rod is a hollow structure, the second stirring rod is slidably disposed in the first stirring rod and is communicated with the first stirring rod, and the second stirring rod is provided with a plurality of spray holes.

[0008] The principle of this scheme is that the gray water is introduced into the stirring tank through the slurry pump, and the gas storage tank introduces high-pressure carbon dioxide into the first driving rod through the rotary joint, and then into the second driving rod, the first stirring rod and the second stirring rod in sequence, and finally sprayed into the gray water from the spray hole. At the same time, the motor drives the driving rod and the stirring rod to rotate, thereby disturbing the gray water.

[0009] The effects of this scheme are as follows: (1) When the motor drives the stirring assembly to rotate, the centrifugal force generated causes the carbon dioxide bubbles ejected from the nozzle to diffuse around the stirring tank, thereby increasing the surface area of ​​contact between carbon dioxide and gray water, accelerating the gas dissolution process and reaction rate. At the same time, the stirring assembly disturbs the turbulence of gray water, accelerating the mixing of gray water and carbon dioxide. Furthermore, the centrifugal force generated by high-speed rotation can cause larger bubbles to break into smaller bubbles. Small bubbles have a larger surface area and can more effectively contact the solutes in the gray water than large bubbles, promoting the reaction between carbon dioxide and gray water. (2) In this scheme, in order to better achieve the dispersion effect of carbon dioxide in gray water, it can be achieved by controlling the speed of the motor. When the motor speed is slow, the carbon dioxide bubbles are subject to a smaller centrifugal force and will gather in the middle area of ​​the stirring tank; when the motor speed is fast, the bubbles are subject to a larger centrifugal force and will disperse around the stirring tank. Therefore, the motor speed can be changed periodically to adjust the distribution of bubbles in the mixing tank so that they rise in a "layered" manner, which not only promotes the uniform distribution of bubbles in the gray water, but also increases the contact time between the gas and the gray water due to the stratification of bubbles during the rising process. At the same time, it can further promote the mixing of gray water and carbon dioxide and accelerate the dissolution of gas.

[0010] Furthermore, a sealing cover is provided on the top of the stirring tank.

[0011] The principle and effect of this solution are: since the solubility of carbon dioxide in gray water is relatively low, but the solubility will increase under high pressure. The high-pressure carbon dioxide is introduced into the mixing tank from the gas storage tank, so the sealing cover is set to ensure the sealing of the mixing tank to increase the solubility of carbon dioxide in gray water.

[0012] Furthermore, the second driving rod is slidably disposed in the first driving rod, and the second driving rod is connected to a spring for returning the second driving rod to its original position.

[0013] The principle and effect of this scheme are as follows: (1) When carbon dioxide is introduced into the first driving rod, the second driving rod will be pushed out of the first driving rod, so that the second stirring rod connected to the second driving rod is away from the first stirring rod; when the introduction of carbon dioxide is stopped, the second driving rod is retracted into the first stirring rod under the drive of the spring. (2) In the process of carbon dioxide and gray water reaction, the gray water needs to be stirred. The second stirring rod is separated from the first stirring rod, which increases the distance between the two, and can expand the stirring range, thereby increasing the stirring area. After the introduction of carbon dioxide is stopped, flocculants need to be added to the stirring tank to aggregate into larger flocs, thereby precipitating the gray water. At this time, if the second stirring rod continues to stir at the bottom of the stirring tank, the flocculant will destroy the structure of the flocs, making it difficult for the flocs to settle. However, stirring cannot be stopped at this time. In the early stage of flocculant addition, if stirring is stopped, it is not conducive to the uniform mixing of the flocculant and the suspended particles in the gray water, resulting in uneven flocculation effect. Therefore, by retracting the second driving rod and the second stirring rod, the gray water can be stirred and the flocs can be avoided from being destroyed.

[0014] Furthermore, a support seat matched with the second driving rod is provided in the stirring tank.

[0015] The principle and effect of this solution are as follows: when the second driving rod is extended to the maximum stroke, the end of the second driving rod will contact the support seat and be rotationally connected thereto, and the support seat provides auxiliary support for the second driving rod.

[0016] Furthermore, there are multiple first stirring rods, and the multiple first stirring rods are circumferentially arranged along the axis of the first driving rod.

[0017] The principle and effect of this solution are: increasing the coverage area during stirring to make the stirring more uniform.

[0018] Furthermore, the second stirring rod is connected to a hollow guide rod, the outer wall of the guide rod is provided with a threaded guide groove, the second stirring rod is provided with a pin matching the guide groove, the guide rod is connected to an elastic rope, and the free end of the elastic rope is connected to the first stirring rod.

[0019] The principle and effect of this scheme are as follows: (1) When carbon dioxide is introduced into the first stirring rod and the motor rotates to generate centrifugal force, the guide rod will be pushed. With the cooperation of the latch, the guide rod drives the second stirring rod to move along the threaded track of the guide groove, so that the second stirring rod rotates and extends out of the first stirring rod, and the spray hole faces upward. After the introduction of carbon dioxide is stopped, the guide rod rotates 90 degrees driven by the elastic rope, so that the spray hole faces downward; after the motor stops, the guide rod drives the second stirring rod to retract into the first stirring rod under the drive of the elastic rope. (2) When carbon dioxide is introduced, the second stirring rod is extended and the spray hole faces upward, not only to increase the stirring area, but also because the second drive rod and the first drive rod are telescopic structures. When the spray hole faces upward, there will be a downward pressure on the second stirring rod and the second drive rod when the gas is ejected, so that the second drive rod is more stably in contact with the support seat. (3) After the introduction of carbon dioxide is stopped, flocculants need to be added to the water. In order to prevent the flocs from settling into the spray hole and causing the spray hole to be blocked, the spray hole is rotated downward. At this time, the grey water still needs to be stirred, so the second stirring rod cannot be retracted into the first stirring rod to avoid reducing the stirring area. (4) When the addition of flocculant stops and the grey water is still, the motor stops rotating and the second stirring rod needs to be retracted into the first stirring rod to avoid the flocs clogging the spray hole when cleaning the flocs.

[0020] A method for recovering waste water from a waste heat boiler comprises applying a waste water recovery device for a waste heat boiler as described above, comprising the following steps: Step S10: Introducing grey water, starting the slurry pump to introduce the grey water into the mixing tank, preparing for the next step of mixing and reaction; Step S20: introducing carbon dioxide, opening the connecting valve between the gas storage tank and the stirring tank, introducing high-pressure carbon dioxide from the gas storage tank into the first driving rod of the stirring tank through a rotary joint, and then passing through the second driving rod, the first stirring rod and the second stirring rod in sequence, and finally spraying out from the spray hole on the second stirring rod into the grey water; Step S30: stirring reaction, starting the motor, driving the stirring assembly to rotate, generating centrifugal force, causing carbon dioxide bubbles to diffuse around the stirring tank, increasing the contact area between the carbon dioxide bubbles and the grey water, and accelerating the gas dissolution process and reaction rate; Step S40: adjusting the bubbles, by periodically changing the rotation speed of the motor, adjusting the distribution of the bubbles in the grey water, achieving stratified rise, extending the contact time between the gas and the grey water, and accelerating dissolution and reaction; Step S50: adding reagents, and adding flocculants after the carbon dioxide and grey water react for 1 hour; Step S60: adjusting the stirring range, in the initial stage of adding the flocculant, speeding up the stirring speed to promote the mixing of the flocculant and the grey water, and when flocs are observed to be formed at the bottom of the reaction tank, reducing the stirring intensity and retracting the second driving rod and the stirring rod to avoid destroying the flocs and promote floc sedimentation; Step S70: After the flocs settle, the sediment is discharged through the slag discharge port at the bottom of the stirring tank. The treated grey water is filtered or further purified and is recovered or discharged after meeting the discharge standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of a waste heat boiler wastewater recovery device of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of a waste heat boiler wastewater recovery device of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a structural schematic diagram of the stirring tank of the present invention; Figure 4 The structure of the stirring assembly of the present invention is schematically shown in FIG. Figure 1 ; Figure 5 The structure of the stirring assembly of the present invention is schematically shown in FIG. Figure 2 ; Figure 6 It is a schematic structural diagram of the first driving rod and the second driving rod of the present invention; Figure 7 It is a schematic structural diagram of the guide rod and the second stirring rod of the present invention; Figure 8 It is a cross-sectional view of the guide rod and the second stirring rod of the present invention.

[0022] The figure marks in the drawings of the specification include: boiler 1, slurry pump 2, stirring tank 3, stirring assembly 31, motor 32, first driving rod 311, second driving rod 312, spring 313, first stirring rod 314, second stirring rod 315, spray hole 3151, guide rod 316, guide groove 3161, pin 317, elastic rope 318, sealing cover 33, support seat 34, gas storage tank 4. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept and technical effects of the present invention in combination with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention: See also Figure 1 and Figure 2 A waste heat boiler wastewater recovery device includes a boiler 1, a slurry pump 2, a mixing tank 3 and a gas storage tank 4 which are connected by pipelines from left to right, and carbon dioxide is arranged in the gas storage tank 4.

[0024] See also Figure 3-Figure 5A sealing cover 33 is provided on the top of the mixing tank 3 to ensure the sealing inside the mixing tank and increase the solubility of carbon dioxide in the grey water. The mixing tank 3 includes a mixing assembly 31 arranged inside the mixing tank 3 and a motor 32 for driving the mixing assembly 31. The motor 32 adopts a PID servo motor and is electrically connected to a PID controller. The mixing assembly 31 includes a first driving rod 311 and a second driving rod 312. The first driving rod 311 and the second driving rod 312 are both hollow structures. The first driving rod 311 is connected to the output end of the motor 32. The first driving rod 311 is connected to the gas storage tank 4 through a rotary joint; the second driving rod 312 is connected to the first driving rod 311. A support seat 34 matching the second driving rod 312 is provided at the bottom of the mixing tank 3. When the second driving rod 312 is extended to the maximum stroke, the end of the second driving rod 312 will contact the support seat 34 and be rotatably connected thereto. The support seat 34 provides auxiliary support for the second driving rod 312. Both the first driving rod 311 and the second driving rod 312 are provided with a first stirring rod 314, the first stirring rod 314 is a hollow structure, and the two groups of first stirring rods 314 are respectively connected to the first driving rod 311 and the second driving rod 312, and the number of the first stirring rods 314 is four first stirring rods 314 arranged circumferentially along the axis of the first driving rod 311 to increase the coverage during stirring and make the stirring more uniform; the second stirring rod 315 is slidably provided in the first stirring rod 314, the second stirring rod 315 is a hollow structure, and a plurality of spray holes 3151 are opened at the free end of the second stirring rod 315.

[0025] The specific working principle is as follows: water is introduced into the stirring tank 3 through the slurry pump 2, and the gas storage tank 4 introduces high-pressure carbon dioxide into the first driving rod 311 through the rotary joint, and then introduces the second driving rod 312, the first stirring rod 314 and the second stirring rod 315 in sequence, and finally sprays it into the gray water from the spray hole 3151. At the same time, the motor 32 drives the first driving rod 311 and the second driving rod 312 and the first stirring rod 314 and the second stirring rod 315 to rotate, thereby disturbing the gray water. When the motor 32 drives the stirring assembly 31 to rotate, the centrifugal force generated causes the carbon dioxide bubbles sprayed from the spray hole 3151 to diffuse around the stirring tank 3, thereby increasing the surface area of ​​contact between carbon dioxide and gray water, accelerating the gas dissolution process and reaction rate. At the same time, the stirring assembly 31 disturbs the turbulence of gray water and accelerates the mixing of gray water and carbon dioxide. Furthermore, the centrifugal force generated by high-speed rotation can cause larger bubbles to break into smaller bubbles. Small bubbles have a larger surface area and can more effectively contact the solute in the gray water than large bubbles, thereby promoting the reaction between carbon dioxide and gray water.

[0026] In order to better achieve the dispersion effect of carbon dioxide in the grey water, it can be achieved by controlling the speed of the motor 32. When the speed of the motor 32 is slow, the carbon dioxide bubbles are subject to a smaller centrifugal force and will gather in the middle area of ​​the stirring tank 3; when the speed of the motor 32 is fast, the bubbles are subject to a larger centrifugal force and will disperse around the stirring tank. Therefore, the speed of the motor 32 can be changed periodically to adjust the distribution of the bubbles in the stirring tank so that they rise in a "layered" shape, which not only promotes the uniform distribution of the bubbles in the grey water, but also increases the contact time between the gas and the grey water due to the stratification of the bubbles during the rising process. At the same time, it can further promote the mixing of grey water and carbon dioxide and accelerate the dissolution of the gas.

[0027] See also Figure 6 The second driving rod 312 is slidably disposed in the first driving rod 311, and the second driving rod 312 is connected to a spring 313 for resetting the second driving rod 312, and both ends of the spring 313 are fixedly connected to the first driving rod 311 and the second driving rod 312 respectively.

[0028] The specific working principle is as follows: During the reaction of carbon dioxide and gray water, the gray water needs to be stirred. When carbon dioxide is introduced into the first driving rod 311, the second driving rod 312 will be pushed to extend out of the first driving rod 311, so that the second stirring rod 315 connected to the second driving rod 312 is away from the first stirring rod 314. The second stirring rod 315 is separated from the first stirring rod 314, and the distance between the two is increased, which can expand the stirring range and thus increase the stirring area. After the introduction of carbon dioxide is stopped, flocculants need to be added to the stirring tank 3 to aggregate into larger flocs, thereby precipitating the gray water. At this time, if the second stirring rod 315 continues to stir at the bottom of the stirring tank 3, the flocculant will destroy the structure of the flocs, making it difficult for the flocs to settle. However, stirring cannot be stopped at this time. In the early stage of adding the flocculant, if stirring is stopped, it is not conducive to the uniform mixing of the flocculant and the suspended particles in the gray water, resulting in uneven flocculation effect. Therefore, when the introduction of carbon dioxide stops, the second driving rod 312 is retracted into the first stirring rod 314 driven by the spring 313. By retracting the second driving rod 312 and the second stirring rod 315, the grey water can be stirred and the flocs can be avoided from being damaged.

[0029] See also Figure 7 and Figure 8The second stirring rod 315 is connected to a hollow guide rod 316, the outer wall of the guide rod 316 is provided with a threaded guide groove 3161, the second stirring rod 315 is provided with a plug 317 matched with the guide groove 3161, the guide rod 316 is connected to an elastic rope 318, and the free end of the elastic rope 318 is fixedly connected to the first stirring rod 314. It should be noted that the thread needs to be set to a thread with a larger thread pitch, and the thread is set to half a circle, and a horizontal guide groove (not shown in the figure) is provided on the guide rod 316, and the guide groove is connected to the thread groove, so that the guide groove first contacts the plug 317, and then the thread contacts the plug 317, so that the guide rod can cooperate with the plug 317, so that the guide rod 316 can rotate 90 degrees.

[0030] Specific working principle: When carbon dioxide is introduced into the first stirring rod 314 and the motor 32 rotates to generate centrifugal force, the guide rod 316 is pushed. With the cooperation of the latch 317, the guide rod 316 drives the second stirring rod 315 to move along the threaded track of the guide groove, so that the second stirring rod 315 rotates and extends out of the first stirring rod 314, and the spray hole 3151 faces upward. When carbon dioxide is introduced, the second stirring rod 315 is extended and the spray hole 3151 faces upward, not only to increase the stirring area, but also because the second driving rod 312 and the first driving rod 311 are telescopic structures, and the spray hole 3151 facing upward will exert a downward pressure on the second stirring rod 315 and the second driving rod 312 when the gas is ejected, so that the second driving rod 312 is more stably in contact with the support seat 34.

[0031] After the introduction of carbon dioxide is stopped, the guide rod 316 rotates itself 90 degrees under the drive of the elastic rope 318, so that the spray hole 3151 faces downward. After the introduction of carbon dioxide is stopped, since flocculants need to be added to the water, in order to prevent the flocs from settling into the spray hole 3151 and causing the spray hole 3151 to be blocked, the spray hole 3151 is rotated downward. At this time, the gray water still needs to be stirred, so the second stirring rod 315 cannot be retracted into the first stirring rod 314 to avoid reducing the stirring area. When the addition of flocculants is stopped and the gray water is still, the motor 32 stops rotating. After the motor 32 stops, the guide rod 316 drives the second stirring rod 315 to retract into the first stirring rod 314 under the drive of the elastic rope 318, and retracts the second stirring rod 315 into the first stirring rod 314 to avoid the flocs from blocking the spray hole 3151 when cleaning the flocs.

[0032] In order to better realize the above waste heat boiler waste water recovery device, the present invention also provides a waste heat boiler waste water recovery method, including the application of a waste heat boiler waste water recovery device, including the following steps: Step S10: Introducing grey water, starting the slurry pump 2 to introduce the grey water into the mixing tank 3, preparing for the next step of mixing and reaction; Step S20: Carbon dioxide is introduced. The connecting valve between the gas storage tank 4 and the stirring tank 3 is opened. The gas storage tank 4 introduces high-pressure carbon dioxide into the first driving rod 311 of the stirring tank 3 through the rotary joint, and then passes through the second driving rod 312, the first stirring rod 314 and the second stirring rod 315 in sequence, and finally sprays out from the spray hole 3151 on the second stirring rod 315 into the grey water; Step S30: stirring reaction, starting the motor 32, driving the stirring assembly 31 to rotate, generating centrifugal force, causing the carbon dioxide bubbles to diffuse around the stirring tank 3, increasing the contact area between the carbon dioxide bubbles and the grey water, and accelerating the gas dissolution process and reaction rate; Step S40: adjusting the bubbles, by periodically changing the rotation speed of the motor 32, adjusting the distribution of the bubbles in the grey water, achieving stratified rise, extending the contact time between the gas and the grey water, and accelerating dissolution and reaction; Step S50: adding reagents, and adding flocculants after the carbon dioxide and grey water react for 1 hour; Step S60: adjusting the stirring range. In the initial stage of adding the flocculant, the stirring speed is increased to promote the mixing of the flocculant and the grey water. When flocs are observed to be formed at the bottom of the reaction tank, the stirring intensity is reduced and the second driving rod 312 and the stirring rod are retracted to avoid destroying the flocs and promote the flocs to settle. Step S70: After the flocs are settled, the sediment is discharged through the slag discharge port at the bottom of the stirring tank 3, and the treated grey water is filtered or further purified and is recovered or discharged after meeting the discharge standard.

[0033] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A waste heat boiler wastewater recovery device, comprising a boiler (1), a slurry pump (2), a stirring tank (3) and a gas storage tank (4) which are connected to each other from left to right through a pipeline, wherein carbon dioxide is provided in the gas storage tank (4); the stirring tank (3) comprises a stirring assembly (31) provided in the stirring tank (3) and a motor (32) for driving the stirring assembly (31); the device is characterized in that: The stirring assembly (31) comprises: A first driving rod (311), the first driving rod (311) being a hollow structure, the first driving rod (311) being connected to an output end of the motor (32), and the first driving rod (311) being in communication with the gas storage tank (4) via a rotary joint; a second driving rod (312), the second driving rod (312) being a hollow structure, and the second driving rod (312) being in communication with the first driving rod (311); A first stirring rod (314), wherein the first stirring rod (314) is a hollow structure, and the first stirring rod (314) is provided in two groups and is respectively connected to the first driving rod (311) and the second driving rod (312); The second stirring rod (315) is a hollow structure. The second stirring rod (315) is slidably disposed in the first stirring rod (314) and is connected to the first stirring rod (314). The second stirring rod (315) is provided with a plurality of spray holes (3151).

2. A waste heat boiler waste water recovery device according to claim 1, characterized in that: A sealing cover (33) is provided on the top of the stirring tank (3).

3. The waste heat boiler waste water recovery device according to claim 1, characterized in that: The second driving rod (312) is slidably disposed inside the first driving rod (311), and the second driving rod (312) is connected to a spring (313) for returning the second driving rod (312).

4. The waste heat boiler waste water recovery device according to claim 1, characterized in that: A support seat (34) matching with the second driving rod (312) is provided in the stirring tank (3).

5. The waste heat boiler waste water recovery device according to claim 1, characterized in that: There are multiple first stirring rods (314), and the multiple first stirring rods (314) are circumferentially arranged along the axis of the first driving rod (311).

6. The waste heat boiler waste water recovery device according to claim 1, characterized in that: The second stirring rod (315) is connected to a hollow guide rod (316); a threaded guide groove (3161) is provided on an outer wall of the guide rod (316); a latch (317) matching the guide groove (3161) is provided inside the second stirring rod (315); the guide rod (316) is connected to an elastic rope (318); a free end of the elastic rope (318) is connected to the first stirring rod (314).

7. A waste heat boiler waste water recovery method, comprising applying a waste heat boiler waste water recovery device as described in any one of claims 1 to 6, characterized in that: The steps include: Step S10: Introducing grey water, starting the slurry pump to introduce the grey water into the mixing tank, preparing for the next step of mixing and reaction; Step S20: introducing carbon dioxide, opening the connecting valve between the gas storage tank and the stirring tank, introducing high-pressure carbon dioxide from the gas storage tank into the first driving rod of the stirring tank through a rotary joint, and then passing through the second driving rod, the first stirring rod and the second stirring rod in sequence, and finally spraying out from the spray hole on the second stirring rod into the grey water; Step S30: stirring reaction, starting the motor, driving the stirring assembly to rotate, generating centrifugal force, causing carbon dioxide bubbles to diffuse around the stirring tank, increasing the contact area between the carbon dioxide bubbles and the grey water, and accelerating the gas dissolution process and reaction rate; Step S40: adjusting the bubbles, by periodically changing the rotation speed of the motor, adjusting the distribution of the bubbles in the grey water, achieving stratified rise, extending the contact time between the gas and the grey water, and accelerating dissolution and reaction; Step S50: adding reagents, and adding flocculants after the carbon dioxide and grey water react for 1 hour; Step S60: adjusting the stirring range, in the initial stage of adding the flocculant, speeding up the stirring speed to promote the mixing of the flocculant and the grey water, and when flocs are observed to be formed at the bottom of the reaction tank, reducing the stirring intensity and retracting the second driving rod and the stirring rod to avoid destroying the flocs and promote floc sedimentation; Step S70: After the flocs settle, the sediment is discharged through the slag discharge port at the bottom of the stirring tank. The treated grey water is filtered or further purified and is recovered or discharged after meeting the discharge standard.

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