Method and device for recovering continuously-discharged sewage of boiler

Abstract

The invention relates to the technical field of boiler continuous blowdown sewage recovery, in particular to a boiler continuous blowdown sewage recovery method and device. According to the device, an impurity collecting groove is formed in the bottom of the boiler, and a closing mechanism linked with a blow-down valve and an impurity scraping piece driven by water flow are arranged in the groove. The method comprises the steps that a blow-down valve is opened, a closing mechanism is linked to isolate an impurity collecting groove, and meanwhile blow-down water flow is used for driving an impurity scraping piece to actively scrape dirt; then, the discharged high-temperature sewage is sequentially fed into a continuous blowdown flash tank, a water-water heat exchanger and a regular blowdown flash tank, and the chemical desalted water and the raw water are heated in an echelon mode. The problems of incomplete pollution discharge and heat energy waste are solved, the pollution discharge efficiency and the heat utilization rate are improved, and the energy-saving and emission-reducing effects are remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler continuous blowdown water recovery, in particular to a boiler continuous blowdown water recovery method and device. BACKGROUND

[0002] During the operation of a boiler, the dissolved solids (such as salts, silicates) and suspended solids (such as silt, corrosion products) in the feed water will concentrate as the water continues to evaporate. In order to control the concentration of these impurities within the safety standard, prevent the steam quality from declining due to water quality deterioration, salt deposition on the turbine blade corrosion, and avoid water slag deposition causing the furnace tube to be blocked, overheated, or even pipe explosion, etc. serious safety accidents, a portion of the boiler water must be discharged from the boiler periodically or continuously, which is called boiler blowdown.

[0003] However, the existing blowdown method has a significant energy waste problem. The boiler discharged blowdown water has high temperature and high pressure, and contains a large amount of heat energy. In many traditional systems, this part of high-temperature blowdown water is directly discharged without effective treatment, and its heat is wasted. In order to make up for the amount of water discharged, the boiler system needs to continuously supplement chemical desalting water and raw water with lower temperature, and a large amount of fuel is consumed to heat these cold water to the working temperature. This direct discharge not only greatly reduces the overall thermal efficiency of the boiler system, directly leading to high fuel costs, but also increases unnecessary carbon emissions, which is contrary to the current environmental protection requirements of energy saving and emission reduction.

[0004] And the existing technology is inefficient and has inherent defects in dealing with the water slag and dirt deposited at the bottom of the boiler. The traditional bottom blowdown (or periodic blowdown) only relies on the blowdown valve opened at the bottom of the boiler to use the water flow formed by the pressure difference for flushing. This method has the following problems, first, the blowdown is not thorough, and there are "dead angles": the water flow near the blowdown port will form a "conical" flushing area, which is called "pull-through effect" or "mouse hole effect". Only the dirt near the blowdown port can be effectively removed, while the dirt slightly far away or located in the "dead angle" of the boiler bottom structure will not be removed, and will be hardened after long-term accumulation, making it more difficult to remove. Moreover, due to the strong water flow impact force in the instant blowdown, a large amount of deposited dirt is stirred up, making it re-suspended in the water body of the entire boiler. These re-stirred suspended solids will enter the dense tube bundles such as water-cooled walls and superheaters along with the boiler water circulation, which is easy to cause blockage, form heat transfer deterioration points, cause local overheating, and become a serious safety hazard.

[0005] Therefore, as can be seen from the above, the existing boiler blowdown technology has significant deficiencies in both energy recovery and scale removal. On the one hand, direct waste of energy leads to increased operating costs and environmental burden; on the other hand, the original and inefficient blowdown method not only fails to completely remove the deposits, but also may cause new risks to the safe operation of the boiler due to agitation of the scale. Therefore, the market urgently needs a new type of boiler blowdown water treatment device that can not only efficiently recover the heat energy in the blowdown water, but also actively and completely remove the deposited scale at the bottom of the boiler, thereby fundamentally solving the problems existing in the prior art. SUMMARY

[0006] The purpose of the present application is to provide a boiler blowdown water recovery method and device to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A boiler blowdown water recycling method, comprising the following steps: a) Isolation and blowdown starting step: opening the valve on the blowdown pipe of the boiler body, the opening operation triggers the closing mechanism at the bottom of the boiler through a linkage mechanism, so that the closing mechanism isolates and closes the miscellaneous groove at the bottom of the boiler, and the high-concentration scale to be discharged is limited in a specific area; b) Active scale removal and auxiliary discharge step: during the blowdown process of step a), the kinetic energy of the blowdown water flow is used to drive the scale removing element to actively and mechanically remove and push the scale in the closed miscellaneous groove, and to discharge it together with the sewage from the blowdown pipe; c) Stepwise heat energy recovery step: the high-temperature sewage discharged from the blowdown pipe is sequentially guided to the blowdown expansion vessel for the first flash evaporation pressure reduction, then the flash evaporated high-temperature water is sent to the water-water heat exchanger for secondary heat exchange, and finally the cooled water is sent to the fixed blowdown expansion vessel for end heat energy recovery and communication with the raw water tank, thereby realizing multi-stage gradient utilization of sewage heat energy.

[0008] The linkage triggering in step a) specifically converts the rotary opening operation of the blowdown valve into the overturning closing operation of the closing mechanism (4) through a set of mechanical synchronous driving elements (46), thereby accurately realizing the simultaneous opening of the blowdown and isolation of the scale.

[0009] The driving scale removing element in step b) specifically rotates the guide fan (513) provided in the blowdown pipe by using the impact of the blowdown water flow, and the rotating power is converted into the reciprocating scraping movement of the scale removing element (5) in the miscellaneous groove through the gear transmission mechanism (514, 515) and the swash plate-linkage mechanism (53).

[0010] The utility model provides a boiler continuous sewage recovery device, including the boiler body, set up on the boiler body and go to the sewage pipe of water injection pipe, water injection pipe and sewage pipe are provided with first valve and second valve respectively, the bottom of boiler body is equipped with the miscellaneous groove, the miscellaneous groove is provided with the closing mechanism, and the closing mechanism is connected with second valve, The miscellaneous groove is also provided with a scum scraping element that synchronously assists in discharging the dirt in the miscellaneous groove during the sewage discharge process of the sewage pipe. One end of the sewage pipe is connected with a continuous sewage expansion vessel, the continuous sewage expansion vessel is connected with a water-water heat exchanger, the water-water heat exchanger is connected with a fixed sewage expansion vessel, and the fixed sewage expansion vessel is connected with a raw water tank.

[0011] Further, the miscellaneous groove is semicircular in shape.

[0012] Further, the closing mechanism includes a closing cover, a first support column, a second support column, a rotating sleeve, a support frame, and a synchronous driving element. The closing cover is slidingly connected at the miscellaneous groove. The two ends of the closing cover are rotatably sleeved on the first support column and the second support column, respectively. One end of the first support column extends to the inside of the front smoke box of the boiler body. The support frame is fixedly installed inside the front smoke box of the boiler body and is used for fixedly connecting the first support column. The second support column is fixedly installed inside the boiler body. The rotating sleeve is rotatably sleeved outside the first support column and is rotatably connected with the boiler body through a sealing bearing. One end of the rotating sleeve is connected with the synchronous driving element, and the synchronous driving element is connected with the second valve.

[0013] Further, the synchronous driving element includes a rotating rod, a synchronization element, a guide rod, and a turnover element. The rotating rod is fixedly installed on the handle of the second valve. The synchronization element is installed outside the boiler body and is connected between the rotating rod and the guide rod. The guide rod is rotatably connected inside the front smoke box of the boiler body. The guide rod is provided with a guide groove. The turnover element is connected with the guide groove and the rotating sleeve.

[0014] Further, the turnover element includes a guide frame, a guide shaft, a slide rail, a rack, and a half gear. The guide frame is provided outside the guide rod. One end of the guide shaft is slidingly connected with the guide groove, and the other end of the guide shaft is fixedly connected with the guide frame. The guide frame is slidingly connected with the slide rail. The slide rail is fixedly installed inside the front smoke box of the boiler body. The rack is fixedly installed on one side of the guide frame and is meshingly connected with the half gear. The half gear is fixedly sleeved outside the rotating sleeve. The provided turnover element drives the rotating sleeve to turn over.

[0015] Further, the impurity scraping device comprises a water flow driving device, a support rod, an inclined disc, a first limiting plate, a second limiting plate, a reciprocating scraping device, a first guide device, a guide-in device and a second guide device, the water flow driving device is arranged between the sewage pipe and the impurity collecting groove, and is used for driving the support rod, two ends of the support rod are rotationally connected with the first support column and the second support column respectively; The inclined disc is provided with a plurality of inclined discs which are fixedly installed on the support rod at equal intervals, the first limiting plate and the second limiting plate are provided on the outer side of each inclined disc, two limiting columns are fixedly installed on the side of the first limiting plate and the second limiting plate close to the inclined disc, and the two limiting columns are slidingly connected with the edge of the inclined disc. The reciprocating scraping device and the guide-in device are arranged on the first limiting plate and the second limiting plate respectively, the first guide device and the second guide device are fixedly installed between the first support column and the second support column, the reciprocating scraping device is connected with the first guide device, and the guide-in device is connected with the second support column, and the impurity scraping device is arranged, so that the high-concentration impurities in the impurity collecting groove can be scraped.

[0016] Further, the water flow driving device comprises a fixing frame, a rotating rod, a flow guide fan, a first bevel gear and a second bevel gear, the fixing frame is fixedly installed in the sewage pipe, and is used for supporting the rotating rod, the bottom of the rotating rod is fixedly connected with the flow guide fan, the top of the rotating rod extends into the impurity collecting groove and is fixedly connected with the first bevel gear, the first bevel gear is fixedly connected with the second bevel gear, and the second bevel gear is fixedly sleeved on one end of the support rod, and the water flow driving device is arranged, so that the support rod can be driven.

[0017] Further, the reciprocating scraping device comprises a connecting frame and a scraping plate, the connecting frame is fixedly installed on the first limiting plate and connected with the first guide device, and the scraping plate is provided with two arc-shaped scraping plates which are fixedly installed on two ends of the connecting frame and are used for scraping the dirt on the inner wall of the inverted closed cover.

[0018] Further, the first guide device comprises a guide rod and a side plate, the side plate is provided with two side plates which are fixedly installed on the first support column and the second support column respectively, two ends of the guide rod are fixedly connected with the two side plates, and the connecting frame is slidingly sleeved on the outer side of the guide rod, so that the reciprocating scraping device can be guided.

[0019] Further, the second guide comprises a positioning rod and positioning racks, the two positioning racks are respectively installed on the first supporting column and the second supporting column, the positioning rod is fixedly installed between the two positioning racks, and the plurality of guide-in elements are connected with the positioning rod.

[0020] The present application has at least the following advantages: The present application has at least the following advantages: When the present application is used, the high-concentration impurities can be collected in the collecting groove, and the high-concentration impurities in the collecting groove can be fully discharged through the blowdown pipe, and the high-concentration impurities are effectively prevented from diffusing into the boiler body, thereby effectively discharging the boiler sewage. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 3 It is a schematic diagram of the overall structure of the present application; Figure 4 It is a schematic diagram of the overall structure of the present application; Figure 5 It is a schematic diagram of the overall structure of the present application; Figure 6 It is a schematic diagram of the overall structure of the present application; Figure 7 It is a schematic diagram of the overall structure of the present application; Figure 8 It is a schematic diagram of the overall structure of the present application; Figure 9 It is a schematic diagram of the overall structure of the present application; Figure 10 It is a schematic diagram of the overall structure of the present application; Figure 11 It is a schematic diagram of the overall structure of the present application; Figure 12 It is a schematic diagram of the overall structure of the present application; Figure 13 It is a schematic view of the synchronous driving member structure of the present application; Figure 14 It is a schematic view of the swash plate structure of the present application; Figure 15 It is a schematic view of the first limiting plate structure of the present application.

[0022] In the figure: 1-boiler body; 11-junk collecting tank; 2-water injection pipe; 21-first valve; 22-second valve; 3-drain pipe; 4-closing mechanism; 41-closing cover; 42-first support column; 43-second support column; 44-rotary sleeve; 45-support frame; 46-synchronous driving member; 461-rotary rod; 462-synchronous member; 4621-first synchronous gear; 4622-second synchronous gear; 4623-synchronous belt; 4624-protection shell; 463-guide rod; 464-turnover member; 4641-guide frame; 4642-guide shaft; 4643-slideway; 4644-rack; 4645-half gear; 5-junk scraping member; 51-water flow driving member; 511-fixed frame; 512-rotary rod; 513-liquid guiding fan; 514-first helical gear; 515-second helical gear; 52-supporting rod; 53-swash plate; 54-first limiting plate; 55-second limiting plate; 56-reciprocating scraping member; 561-connecting frame; 562-scraping plate; 57-first guide member; 571-guide rod; 572-side plate; 58-lead-in member; 581-moving block; 582-pushing branch; 583-flow pushing plate; 584-connecting seat; 59-second guide member; 591-limiting column; 592-positioning rod; 593-positioning frame; 6-raw water tank; 7-continuous drain expansion vessel; 8-water-water heat exchanger; 9-constant drain expansion vessel. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. EMBODIMENT

[0024] Please refer to Figures 1 to 5 A boiler continuous drain water recycling device, comprising a boiler body 1, a water injection pipe 2 and a drain pipe 3 arranged on the boiler body 1, and in the present application, a water pump is arranged on the water injection pipe 2 and the drain pipe 3, which is prior art and will not be described in detail, the water injection pipe 2 and the drain pipe 3 are respectively provided with a first valve 21 and a second valve 22, the bottom of the boiler body 1 is provided with a junk collecting tank 11, the junk collecting tank 11 is provided with a closing mechanism 4, and the closing mechanism 4 is connected with the second valve 22. A scumming element 5 is arranged at the collecting groove 11, which synchronously assists in discharging the dirt at the collecting groove 11 during the discharging process of the discharging pipe 3; One end of the discharging pipe 3 is connected with a continuous discharging expansion vessel 7, the continuous discharging expansion vessel 7 is connected with a water-water heat exchanger 8, the water-water heat exchanger 8 is a surface heat exchanger, the water-water heat exchanger 8 is connected with a constant discharging expansion vessel 9, and the constant discharging expansion vessel 9 is connected with the raw water tank 6.

[0025] The collecting groove 11 is semicircular in shape; the closing mechanism 4 comprises a closing cover 41, a first supporting column 42, a second supporting column 43, a rotating sleeve 44, a supporting frame 45 and a synchronous driving element 46, the closing cover 41 is slidingly connected at the collecting groove 11, and the closing cover 41 is semicircular in shape, as shown in the accompanying drawings Figures 5 to 9 , and in the initial state, the outer surface of the closing cover 41 is in close contact with the inner wall of the collecting groove 11, while when discharging, the closing cover 41 and the collecting groove 11 form a hollow cylindrical shape, realizing the closing effect of high-concentration impurities at the bottom of the boiler body 1, preventing the diffusion of high-concentration impurities, and in this application, a plurality of water holes are arranged at equal intervals on the closing cover 41, which can ensure that the pressure inside the collecting groove 11 cavity in the closed state is consistent with the pressure inside the boiler body 1, and at the same time, avoid the diffusion of impurities; Please refer to Figures 5 to 10 , both ends of the closing cover 41 are rotatably sleeved on the first supporting column 42 and the second supporting column 43, one end of the first supporting column 42 extends to the inside of the front smoke box of the boiler body 1, the supporting frame 45 is fixedly installed in the inside of the front smoke box of the boiler body 1, and the supporting frame 45 is used for fixedly connecting the first supporting column 42, and the second supporting column 43 is fixedly installed in the inside of the boiler body 1; The rotating sleeve 44 is rotatably sleeved on the outside of the first supporting column 42, and the rotating sleeve 44 is rotatably connected with the boiler body 1 through a sealing bearing, that is, the rotating sleeve 44 is sealingly connected with the boiler body 1 while the rotating sleeve 44 can rotate relative to the boiler body 1, one end of the rotating sleeve 44 is connected with the synchronous driving element 46, and the synchronous driving element 46 is connected with the second valve 22.

[0026] Please refer to Figures 11 to 13 , the synchronous driving element 46 comprises a rotating rod 461, a synchronous element 462, a guide rod 463 and a turnover element 464, the rotating rod 461 is fixedly installed on the handle of the second valve 22, the synchronous element 462 is installed on the outside of the boiler body 1, and the synchronous element 462 is connected between the rotating rod 461 and the guide rod 463, the guide rod 463 is rotatably connected in the inside of the front smoke box of the boiler body 1, the guide rod 463 is provided with a guide groove, the turnover element 464 is connected with the guide groove, and the turnover element 464 is connected with the rotating sleeve 44.

[0027] The turnover piece 464 comprises a guide frame 4641, a guide shaft 4642, a slide rail 4643, a rack 4644 and a half gear 4645. The guide frame 4641 is arranged outside the guide rod 463. One end of the guide shaft 4642 is in sliding connection with the guide groove, and the other end of the guide shaft 4642 is fixedly connected with the guide frame 4641. The guide frame 4641 is in sliding connection with the slide rail 4643, and the slide rail 4643 is fixedly installed inside the front smoke box of the boiler body 1. The rack 4644 is fixedly installed on one side of the guide frame 4641, and the rack 4644 is in meshing connection with the half gear 4645. The half gear 4645 is fixedly sleeved outside the rotating sleeve 44.

[0028] As a supplement, the synchronous piece 462 comprises a first synchronous gear 4621, a second synchronous gear 4622 and a synchronous belt 4623. The first synchronous gear 4621 is fixedly sleeved on the rotating rod 461. The second synchronous gear 4622 is fixedly sleeved on the bottom of the guide rod 463. The bottom of the guide rod 463 is also provided with a protective shell 4624, which is fixedly installed on the bottom of the boiler body 1. The protective shell 4624 is used for protecting the first synchronous gear 4621 and the second synchronous gear 4622. The synchronous belt 4623 is in transmission connection between the first synchronous gear 4621 and the second synchronous gear 4622. Therefore, when the rotating rod 461 rotates, the second synchronous gear 4622 is driven to rotate through the first synchronous gear 4621 and the synchronous belt 4623, so as to further drive the guide rod 463 to rotate. Specific implementation process: when the boiler sewage is discharged, the staff rotates the second valve 22 on the blow-off pipe 3, that is, rotates the rotating rod 461, so that the rotating rod 461 rotates by 90°. When the rotating rod 461 slowly rotates the second valve 22, the blow-off pipe 3 is opened, and the rotating rod 461 drives the guide rod 463 to rotate through the synchronous piece 462 and the synchronous belt 4623. When the guide rod 463 rotates, the guide shaft 4642 is further driven under the limiting action of the guide groove on the guide rod 463. Under the limiting action of the guide frame 4641 and the slide rail 4643, the guide frame 4641 drives the rack 4644 on it to rotate relative to the half gear 4645. When the half gear 4645 rotates, the rotating sleeve 44 rotates synchronously, that is, the rotating sleeve 44 rotates by 180°, so that the closing cover 41 rotates to the upper side of the impurity collecting groove 11, and the closing cover 41 keeps the inside of the impurity collecting groove 11 relatively closed.

[0029] Please refer to Figures 5 to 7 and Figures 14 and 15, the scraping piece 5 includes a water flow driving piece 51, a supporting rod 52, an inclined disc 53, a first limiting plate 54, a second limiting plate 55, a reciprocating scraping piece 56, a first guide piece 57, a guide-in piece 58 and a second guide piece 59, the water flow driving piece 51 is arranged between the blow-off pipe 3 and the impurity collecting groove 11, the water flow driving piece 51 is used for driving the supporting rod 52, both ends of the supporting rod 52 are rotationally connected with the first supporting column 42 and the second supporting column 43 respectively; The inclined disc 53 is provided with a plurality of inclined discs 53 which are fixedly installed at equal intervals on the supporting rod 52, the first limiting plate 54 and the second limiting plate 55 are arranged on the outer side of each inclined disc 53, two limiting columns 591 are fixedly installed on the side of the first limiting plate 54 and the second limiting plate 55 close to the inclined disc 53, and the two limiting columns 591 are slidingly connected with the edge of the inclined disc 53; The reciprocating scraping piece 56 and the guide-in piece 58 are respectively installed on the first limiting plate 54 and the second limiting plate 55, the first guide piece 57 and the second guide piece 59 are fixedly installed between the first supporting column 42 and the second supporting column 43, a plurality of reciprocating scraping pieces 56 are connected with the first guide piece 57, and a plurality of guide-in pieces 58 are connected with the second supporting column 43.

[0030] The water flow driving piece 51 includes a fixed frame 511, a rotating rod 512, a flow guide fan 513, a first bevel gear 514 and a second bevel gear 515, the fixed frame 511 is fixedly installed inside the blow-off pipe 3, and the fixed frame 511 is used for supporting the rotating rod 512, the rotating rod 512 is rotationally connected with the fixed frame 511, the bottom of the rotating rod 512 is fixedly connected with the flow guide fan 513, a sliding groove is arranged at the position of the rotating rod 512 of the closed cover 41, the arrangement of the sliding groove does not affect the rotation of the rotating rod 512, and can enable the closed cover 41 to stably rotate, the top of the rotating rod 512 extends into the impurity collecting groove 11 and is fixedly connected with the first bevel gear 514, the first bevel gear 514 is fixedly connected with the second bevel gear 515, and the second bevel gear 515 is fixedly sleeved on one end of the supporting rod 52.

[0031] The reciprocating scraping piece 56 includes a connecting frame 561 and a scraping plate 562, the connecting frame 561 is fixedly installed on the first limiting plate 54, and the connecting frame 561 is connected with the first guide piece 57, the scraping plate 562 is provided with two, the two scraping plates 562 are both arc-shaped, the two scraping plates 562 are fixedly installed on both ends of the connecting frame 561, and the two scraping plates 562 are used for scraping the dirt on the inner wall of the overturned closed cover 41.

[0032] The first guide piece 57 includes a guide rod 571 and a side plate 572, the side plate 572 is provided with two, the two side plates 572 are fixedly installed on the first supporting column 42 and the second supporting column 43 respectively, the two ends of the guide rod 571 are fixedly connected with the two side plates 572, and a plurality of connecting frames 561 are slidingly sleeved on the outer side of the guide rod 571.

[0033] The second guide 59 comprises a positioning rod 592 and two positioning frames 593, the two positioning frames 593 are respectively installed on the first support column 42 and the second support column 43, and the positioning rod 592 is fixedly installed between the two positioning frames 593, and the plurality of guide-in elements 58 are connected with the positioning rod 592.

[0034] Specific implementation process: when the blowdown pipe 3 is opened, the boiler sewage is discharged through the blowdown pipe 3, and the closure cover 41 and the collecting groove 11 form a relatively closed state, and when the sewage is discharged, the water flow passes through the guide fan 513, thereby driving the guide fan 513, and the guide fan 513 rotates, thereby driving the rotating rod 512 to rotate synchronously, when the rotating rod 512 rotates, the first bevel gear 514 is driven to rotate, the first bevel gear 514 drives the second bevel gear 515 to rotate, thereby further rotating the support rod 52 relative to the first support column 42 and the second support column 43, when the support rod 52 rotates, the plurality of swash plates 53 on the synchronous belt 4623 are driven to rotate synchronously, the limiting column 591 at the edge of the swash plate 53 is further reciprocatingly slid on the guide rod 571 under the limiting action of the first limiting plate 54 and the connecting frame 561, and when the connecting frame 561 reciprocatingly moves, the scraping plate 562 is reciprocatingly moved relative to the inner wall of the turned-over closure cover 41 under the synchronous belt 4623, thereby achieving the effect of scraping the dirt on the inner wall of the closure cover 41, and the plurality of swash plates 53 in the application further simultaneously achieve the effect of pushing the sewage, so that the sewage flows out towards the blowdown pipe 3. Embodiment

[0035] Please refer to Figures 14 and 15 , embodiment two is a further supplementary description of the guide-in element 58 in embodiment one, specifically: the guide-in element 58 comprises a moving block 581, a pushing branch 582, a flow pushing plate 583 and a connecting seat 584, the moving block 581 is slidingly sleeved outside the positioning rod 592, and the moving block 581 is fixedly connected with the second limiting plate 55, one end of the pushing branch 582 is rotatably connected with the moving block 581 through a pin shaft, and the other end of the pushing branch 582 is rotatably connected with the connecting seat 584 through a pin shaft, and the connecting seat 584 is fixedly installed on the positioning rod 592; Thus, when the supporting rod 52 rotates, the plurality of inclined discs 53 on the synchronous belt 4623 rotate synchronously, and the two sets of limiting columns 591 on the inclined discs 53 rotate, and the limiting columns 591 are driven to further drive the moving blocks 581 to reciprocate relative to the positioning rods 592 under the limiting action of the second limiting plate 55 and the moving blocks 581, and the moving blocks 581 reciprocate to drive the push flow plate 583 to reciprocate through the push rod 582, so that the push flow plate 583 continuously pushes the sewage in the impurity collection groove 11 to flow towards the sewage pipe 3.

[0036] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A method for recycling boiler wastewater, characterized in that: The following steps are involved: a) Isolation and blowdown start-up step: Opening the valve on the blowdown pipe of the boiler body. This opening action triggers the closing mechanism at the bottom of the boiler through a linkage mechanism, causing the closing mechanism to isolate and seal the sump at the bottom of the boiler, confining the high-concentration dirt to be discharged to a specific area; b) Active cleaning and auxiliary discharge step: During the discharge process in step a), the scraper is driven by the kinetic energy of the wastewater flow to actively mechanically scrape and push the dirt in the closed sump, and forcibly discharge it from the sewage pipe along with the wastewater; c) Steps of cascade heat energy recovery: The high-temperature sewage discharged from the sewage pipe is guided to the continuous row expansion tank in sequence for the first flash evaporation and pressure reduction, and then the high-temperature water after flash evaporation is sent to the water-to-water heat exchanger for secondary heat exchange. Finally, the cooled water is sent to the fixed row expansion tank for terminal heat energy recovery and connected to the raw water tank, thereby realizing multi-stage cascade utilization of sewage heat energy.

2. The method for recycling boiler wastewater according to claim 1, characterized in that: The linkage triggering in step a) is specifically to convert the rotation opening action of the sewage discharge valve into the flip closing action of the closing mechanism (4) through a set of mechanical synchronous driving parts (46), thereby accurately achieving the synchronization of sewage discharge opening and dirt isolation.

3. The method for recycling boiler wastewater according to claim 1, characterized in that: The driving of the scraper in step b) is specifically achieved by utilizing the sewage flow to impact the guide fan (513) disposed in the sewage pipe to cause it to rotate, and the rotational power is converted into a reciprocating scraping motion of the scraper (5) in the debris collecting tank through a gear transmission mechanism (514, 515) and a swash plate-connecting rod mechanism (53).

4. A boiler sewage recovery device, comprising a boiler body (1), a water injection pipe (2) and a sewage discharge pipe (3) arranged on the boiler body (1), wherein the water injection pipe (2) and the sewage discharge pipe (3) are respectively provided with a first valve (21) and a second valve (22), and characterized in that: The bottom of the boiler body (1) is provided with a collecting groove (11), the collecting groove (11) is provided with a closing mechanism (4), and the closing mechanism (4) is connected to the second valve (22); The debris collecting tank (11) is also provided with a scraper (5), and the scraper (5) assists in the synchronous discharge of dirt from the debris collecting tank (11) during the process of sewage discharge from the sewage pipe (3); One end of the sewage pipe (3) is connected to a continuous row expansion container (7), the continuous row expansion container (7) is connected to a water-to-water heat exchanger (8), the water-to-water heat exchanger (8) is connected to a fixed row expansion container (9), and the fixed row expansion container (9) is connected to the raw water tank (6).

5. The boiler wastewater recovery device according to claim 4, characterized in that: The collecting trough (11) is semicircular in shape; the closing mechanism (4) comprises a closing cover (41), a first support column (42), a second support column (43), a rotating sleeve (44), a support frame (45) and a synchronous driving member (46); the closing cover (41) is slidably connected to the collecting trough (11); the two ends of the closing cover (41) are respectively rotatably sleeved on the first support column (42) and the second support column (43); one end of the first support column (42) extends to the inside of the front smoke box of the boiler body (1); the support frame (45) is fixedly installed in the inside of the front smoke box of the boiler body (1); and the support frame (45) is used to fixedly connect the first support column (42); the second support column (43) is fixedly installed in the inside of the boiler body (1); The rotating sleeve (44) is rotatably sleeved on the outside of the first support column (42), and the rotating sleeve (44) is rotatably connected to the boiler body (1) via a sealing bearing. One end of the rotating sleeve (44) is connected to a synchronous drive member (46), and the synchronous drive member (46) is connected to the second valve (22).

6. The boiler wastewater recovery device according to claim 5, characterized in that: The synchronous driving member (46) includes a rotating rod (461), a synchronous member (462), a guide rod (463) and a flip member (464), wherein the rotating rod (461) is fixedly mounted on the handle of the second valve (22), the synchronous member (462) is mounted on the outside of the boiler body (1), and the synchronous member (462) is connected between the rotating rod (461) and the guide rod (463), the guide rod (463) is rotatably connected to the inside of the front smoke box of the boiler body (1), the guide rod (463) is provided with a guide groove, the flip member (464) is connected to the guide groove, and the flip member (464) is connected to the rotating sleeve (44); the flip member (464) includes a guide frame (4641), a guide shaft ( 4642), a slide rail (4643), a rack (4644) and a half gear (4645), the guide frame (4641) is arranged on the outside of the guide rod (463), one end of the guide shaft (4642) is slidably connected to the guide groove, and the other end of the guide shaft (4642) is fixedly connected to the guide frame (4641), the guide frame (4641) is slidably connected to the slide rail (4643), the slide rail (4643) is fixedly installed inside the front smoke box of the boiler body (1), the rack (4644) is fixedly installed on one side of the guide frame (4641), and the rack (4644) is meshed with the half gear (4645), and the half gear (4645) is fixedly sleeved on the outside of the rotating sleeve (44).

7. The boiler wastewater recovery device according to claim 4, characterized in that: The scraper (5) comprises a water flow driving member (51), a support rod (52), a swash plate (53), a first limiting plate (54), a second limiting plate (55), a reciprocating scraper (56), a first guide member (57), an introduction member (58) and a second guide member (59). The water flow driving member (51) is arranged between the sewage pipe (3) and the debris collecting tank (11). The water flow driving member (51) is used to drive the support rod (52). Both ends of the support rod (52) are rotatably connected to the first support column (42) and the second support column (43) respectively. The swash plate (53) is provided with a plurality of swash plates (53), and the plurality of swash plates (53) are fixedly mounted on the support rod (52) at equal distances. A first limiting plate (54) and a second limiting plate (55) are provided on the outside of each swash plate (53). Two limiting columns (591) are fixedly mounted on one side of the first limiting plate (54) and the second limiting plate (55) close to the swash plate (53). The two limiting columns (591) are both slidably connected to the edge of the swash plate (53). The reciprocating scraping member (56) and the introducing member (58) are respectively mounted on the first limiting plate (54) and the second limiting plate (55); the first guiding member (57) and the second guiding member (59) are both fixedly mounted between the first supporting column (42) and the second supporting column (43); a plurality of the reciprocating scraping members (56) are connected to the first guiding member (57), and a plurality of the introducing members (58) are connected to the second supporting column (43).

8. The boiler wastewater recovery device according to claim 7, characterized in that: The water flow driving member (51) comprises a fixing frame (511), a rotating rod (512), a guide fan (513), a first bevel gear (514) and a second bevel gear (515); the fixing frame (511) is fixedly installed inside the sewage pipe (3), and the fixing frame (511) is used to support the rotating rod (512); the bottom of the rotating rod (512) is fixedly connected to the guide fan (513), and the top of the rotating rod (512) extends to the inside of the sump (11) and is fixedly connected to the first bevel gear (514); the first bevel gear (514) is fixedly connected to the second bevel gear (515), and the second bevel gear (515) is fixedly sleeved on one end of the support rod (52).

9. The boiler wastewater recovery device according to claim 8, characterized in that: The reciprocating scraper (56) includes a connecting frame (561) and a scraper plate (562). The connecting frame (561) is fixedly mounted on the first limiting plate (54), and the connecting frame (561) is connected to the first guide member (57). Two scraper plates (562) are provided. Both of the two scraper plates (562) are arc-shaped. The two scraper plates (562) are fixedly mounted at both ends of the connecting frame (561). The two scraper plates (562) are used to flip the scraper plate. The first guide member (57) comprises a guide rod (571) and a side plate (572), two side plates (572) are provided, and the two side plates (572) are fixedly mounted on the first support column (42) and the second support column (43), respectively. The two ends of the guide rod (571) are fixedly connected to the two side plates (572), and the plurality of connecting frames (561) are all slidably sleeved on the outside of the guide rod (571).

10. The boiler wastewater recovery device according to claim 9, characterized in that: The second guide member (59) includes a positioning rod (592) and a positioning frame (593). Two positioning frames (593) are provided. The two positioning frames (593) are respectively installed on the first support column (42) and the second support column (43). The positioning rod (592) is fixedly installed between the two positioning frames (593). The plurality of guide members (58) are all connected to the positioning rod (592).

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