CN218993362U

CN218993362U - Continuous waste water high-quality recovery system based on superheated steam purifier

Info

Publication number: CN218993362U
Application number: CN202223093644.9U
Authority: CN
Inventors: 余剑; 刘登亮; 刘万超; 刘秀; 李帅
Original assignee: Chinalco Environmental Protection And Energy Conservation Group Co ltd
Current assignee: Chinalco Environmental Protection And Energy Conservation Group Co ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-05-09
Anticipated expiration: 2032-11-21

Abstract

The utility model discloses a continuous waste water high-quality recovery system based on a superheated steam purifier, wherein a continuous waste water pipeline is connected with an input port of a continuous expansion vessel through a stop valve; the flash water outlet of the row of flash tanks is connected with a flash water pipeline; the steam mixer is provided with a first steam inlet and a second steam inlet, a saturated steam outlet of the continuous row of expansion vessels is connected with the first steam inlet of the steam mixer through a one-way valve, and a source superheated steam pipeline is connected with the second steam inlet through a stop valve; the outlet of the steam mixer is connected with the superheated steam inlet of the steam purifier through a one-way valve; the outlet of the steam purifier is connected with a steam supply pipeline. The system adopts two modes to convert part or all working media and heat in the continuous waste water into high-quality superheated steam, has higher value, can efficiently filter out impurities such as phosphate and the like contained in the superheated steam, and generates the superheated steam meeting or exceeding the external steam supply index requirement.

Description

Continuous waste water high-quality recovery system based on superheated steam purifier

Technical Field

The utility model relates to the technical field of boiler residual pressure waste heat recovery, in particular to a continuous waste water high-quality recovery system based on a superheated steam purifier.

Background

The existing continuous-discharge waste water recovery system of the boiler adopts unit system configuration, continuous-discharge waste water is discharged to a continuous-discharge flash vessel for flash evaporation, and flash evaporation saturated steam reaches the pressure of a deaerator (less than 0.9 MPa) and then enters the deaerator for recovery; the flash saturated water (equal to the flash steam pressure) is discharged to a fixed-row flash tank of the boiler, and after the flash steam is flashed again, the part of flash steam is discharged to the air through the fixed row, and the flash water is directly discharged.

According to the existing continuous exhaust waste water recovery system of the boiler, for a certain 330MW unit, the steam drum pressure is 17.5MPa (saturated steam specific enthalpy 1710.76 kg/kg), the deaerator pressure is 0.8MPa (saturated steam specific enthalpy, saturated water specific enthalpy), and after the continuous exhaust flash evaporator is flashed, the working medium and heat are distributed according to the following rule (neglecting loss): 1× 1710.76 =a× 2768.3+ (1-a) × 721.02 (a: mass percent of vapor after flash evaporation), then a= (1710.76-721.02)/(2768.3-721.02) =48.3%, heat percent after flash evaporation= (48.3% × 2768.3)/1710.76 =78.16%; 51.7% of the total mass contained in the flash water was lost by 21.84% of the total heat. Some continuous-discharge wastewater recovery systems use a mode of adding a heat exchanger to heat desalted water for flash water of a continuous-discharge flash tank, and extract some heat, but still have some loss.

Generally, the best condition of the traditional recovery mode is that the continuous waste water is partially converted into saturated steam, partially heated water and other mediums, and the medium is partially wasted and is not utilized with high quality.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a continuous wastewater high-quality recovery system based on a superheated steam purifier.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

as one scheme of the utility model, the continuous waste water high-quality recovery system based on the superheated steam purifier comprises a continuous expansion vessel, a steam mixer and a steam purifier; the continuous waste water pipeline is connected with the input port of the continuous expansion vessel through a stop valve; the flash water outlet of the row of flash tanks is connected with a flash water pipeline; the steam mixer is provided with a first steam inlet and a second steam inlet, a saturated steam outlet of the continuous row of expansion vessels is connected with the first steam inlet of the steam mixer through a one-way valve, and a source superheated steam pipeline is connected with the second steam inlet through a stop valve; the outlet of the steam mixer is connected with the superheated steam inlet of the steam purifier through a one-way valve; the outlet of the steam purifier is connected with a steam supply pipeline.

Further, a soda mixer is included; the continuous waste water discharge pipeline and the source superheated steam pipeline are respectively connected with the inlet of the steam-water mixer; the outlet of the steam-water mixer is connected with the superheated steam inlet of the steam purifier; the outlet of the steam purifier is connected with a steam supply pipeline.

Still further, the vapor purifier includes a purifier body, a superheated vapor inlet, a superheated vapor outlet, and a nanofiltration unit bundle; the purifier body is respectively provided with a superheated steam inlet and a superheated steam outlet; the nano-filtration unit tube bundle is arranged in the purifier body and is positioned between a front cavity and a rear cavity in the purifier body, the nano-filtration unit tube bundle is composed of a plurality of nano-filtration tubes, the front end tube orifices of the nano-filtration tubes are closed, and the rear end tube orifices of the nano-filtration tubes are open; the front end and the middle part of the nano-filtration unit tube bundle are supported by the tube bundle, and the rear end is supported by the tube plate; the tube plate is fixed with the outer tube wall at the rear end of the nano filter tube in a sealing way.

Furthermore, the nano filter tube is made of foam metal material, and the temperature resistance is more than 500 ℃.

Further, a desalted water flushing port is arranged at the top of the rear chamber of the purifier body; and a flushing water outlet is arranged at the bottom of the front cavity of the purifier body.

Still further, the steam purifier also comprises a steam inlet temperature pressure measuring point and a steam outlet temperature pressure measuring point, wherein the steam inlet temperature pressure measuring point and the steam outlet temperature pressure measuring point are respectively arranged on an inlet pipe section and an outlet pipe section of the steam purifier.

Further, the part of the inlet pipe section of the steam purifier connected with the purifier body is vertical to the purifier body.

Further, a front cavity manhole and a rear cavity manhole are also arranged on the purifier body; the front cavity manhole corresponds to the center of the front end cover of the purifier body; the back chamber manhole is positioned at the top of the back chamber of the purifier body.

Furthermore, the purifier body is also provided with a front end cover and a rear end cover, wherein the front end cover is in arc-shaped arrangement and is connected with the front end of the front cavity of the purifier body by adopting a flange and a high-strength bolt; the rear end cover is arc-shaped and is connected with the rear end of the rear chamber of the purifier body through a flange and high-strength bolts.

The utility model has the beneficial effects that:

1. the utility model can convert part or all working medium and heat in the continuous waste water into high-quality superheated steam in two ways, and has higher value compared with the saturated steam with the same pressure as the deaerator, heating water, desalted water or directly discharging.

2. The utility model adopts the nano-filtration unit made of foam metal to purify the superheated steam, the operating temperature is less than or equal to 500 ℃, and impurities such as phosphate and the like contained in the superheated steam can be efficiently filtered out, so that the superheated steam meeting or exceeding the external steam supply index requirement is generated.

3. The utility model can expand the application mode of continuous waste water, and the optimal application mode is selected by the source superheated steam, the continuous waste water, the final steam supply parameters, the flow and the like, so as to provide high-quality superheated steam far higher than the pressure of the deaerator.

Drawings

FIG. 1 is a schematic diagram showing the overall connection of the recovery system in examples 1 and 2 of the present utility model;

FIG. 2 is a cross-sectional view of the steam purifier according to

embodiments

1 and 2 of the present utility model;

FIG. 3 is an A-direction cross-sectional view of the steam purifier according to examples 1 and 2 of the present utility model;

fig. 4 is a B-direction sectional view of the steam purifier according to examples 1 and 2 of the present utility model.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings, and it should be noted that, on the premise of the present technical solution, the present embodiment provides a detailed implementation manner and a specific operation procedure, but the protection scope of the present utility model is not limited to the present embodiment.

Example 1

The embodiment provides a continuous waste water high-quality recovery system based on a superheated steam purifier, which is shown in fig. 1 and comprises a continuous expansion vessel 1, a steam mixer 2 and a steam purifier 3; the continuous waste water pipeline is connected with the input port of the continuous expansion vessel 1 through a stop valve; the flash water outlet of the row of flash tanks 1 is connected with a flash water pipeline; the steam mixer 2 is provided with a first steam inlet and a second steam inlet, the saturated steam outlet of the continuous expansion vessel 1 is connected with the first steam inlet of the steam mixer 2 through a one-way valve, and the source superheated steam pipeline 4 is connected with the second steam inlet through a stop valve; the outlet of the steam mixer 2 is connected with the superheated steam inlet of the steam purifier through a one-way valve; the outlet of the steam purifier 3 is connected with a steam supply pipeline.

In the recovery system, after the continuous wastewater is flashed by the continuous expansion vessel 1, saturated steam containing certain impurities is output from the continuous expansion vessel 1, is input into the steam mixer 2 from the first steam inlet of the steam mixer 2, and source superheated steam is sent into the second steam inlet of the steam mixer from the source superheated steam pipeline. The two paths of steam are fully mixed into superheated steam containing certain impurities in a steam mixer. The superheated steam inlet of the steam purifier 3 receives the superheated steam containing certain impurities and output by the steam mixer 2, filters the impurities in the superheated steam, and conveys the clean superheated steam to a steam supply pipeline.

As shown in fig. 2 to 4, the steam purifier 3 includes a purifier body 31, a first superheated steam inlet 32, a second superheated steam inlet 33, a superheated steam outlet 34, a steam inlet temperature and pressure measuring point 35, a steam outlet temperature and pressure measuring point 36, a desalted water flushing port 37, a flushing water outlet 38, a nano-filtration unit tube bundle 39, a tube bundle support 310, a tube sheet 311, a front chamber manhole 312, a rear chamber manhole 313, a front end cover 314, and a rear end cover 315; the purifier body 31 is provided with a first superheated steam inlet 32, a second superheated steam inlet 33 and a superheated steam outlet 34, respectively, wherein the first superheated steam inlet 32 is connected to the outlet of the steam mixer 2. The steam inlet temperature and pressure measuring point 35 and the steam outlet temperature and pressure measuring point 36 are respectively arranged on an inlet pipe section and an outlet pipe section of the steam purifier 3; the nano-filtration unit tube bundles 39 are arranged inside the purifier body 31 and between a front cavity and a rear cavity inside the purifier body 31, the nano-filtration unit tube bundles 39 are composed of a plurality of nano-filtration tubes, the front end tube openings of the nano-filtration tubes are welded and sealed by stainless steel, and the welded openings extend along the axial direction by 20mm, so that tightness during steam flushing is ensured; the rear pipe orifice of the nano filter pipe is open; the front end and the middle part of the nano-filtration unit tube bundle 39 are supported by a tube bundle support 310, and the rear end is supported by a tube plate 311; the tube sheet 311 is welded to the outer tube wall at the rear end of the nanofiltration tube to ensure that steam can only enter the rear chamber of the purifier body 31 from within the nanofiltration tube. The nano filter tube is made of foam metal material, and the temperature resistance is more than 500 ℃. The top of the rear chamber of the purifier body 31 is provided with a desalted water flushing port 37; the front chamber bottom flush water outlet 38 of the cleaner body 31.

The steam to be purified enters the outside of the nano-filter tube after being homogenized in the front cavity of the purifier body 31, and enters the inside of the nano-filter tube from the outside of the nano-filter tube, thereby completing steam purification; impurities such as phosphate in the steam are remained on the outer wall of the nano filter tube; the cleaned superheated steam is collected in the rear chamber and is output from the superheated steam outlet 34 to a steam supply line for supplying steam to a steam consumer. The steam inlet temperature and pressure measuring point 35 and the steam outlet temperature and pressure measuring point 36 are used for jointly judging the operation condition of the purifier, and when the differential pressure is more than 0.02MPa, the steam purifier 3 needs to be cleaned. At this time, the demineralized water flushing port 37 is opened, demineralized water is introduced into the rear cavity of the purifier body 31 until the interior of the purifier body 31 is filled, and after 24 hours of soaking, the flushing water outlet 38 is opened to discharge sewage.

In the present embodiment, the portion of the inlet pipe section of the steam purifier 3 connected to the purifier body 31 is perpendicular to the purifier body 31. Superheated steam to be purified vertically enters the steam purifier 3 from the inlet pipeline, so that the scouring of the steam to the nano-filtration unit tube bundles can be reduced.

In this embodiment, the front cavity manhole 312 is located at the center of the front end cover 314 for the front cavity internal inspection of the purifier body 31; the rear chamber manhole 313 is located at the top of the rear chamber of the cleaner body 1 for the internal inspection of the rear chamber of the cleaner body 31.

In this embodiment, the front end cover 314 is arc-shaped, and is connected with the front end of the front cavity of the purifier body 31 by adopting a flange and high-strength bolts; the rear end cap 315 is arc-shaped and is connected with the rear end of the rear chamber of the purifier body 31 by adopting a flange and high-strength bolts. The flange connection is easy to repair and replace the internal facilities.

Example 2

Compared with the embodiment 1, as shown in fig. 1, the embodiment further comprises a steam-water mixer 5; the waste water pipeline and the source superheated steam pipeline are connected with inlets of the steam-water mixer 5 respectively; the outlet of the steam-water mixer 5 is connected with a superheated steam inlet II of the steam purifier. In the recovery system, in the steam-water mixer 5, the continuously discharged waste water is directly sprayed into superheated steam and then purified by the steam purifier 3.

Example 3

A certain thermal power plant is a 4X 330W heat supply and external industrial steam supply unit, a continuous wastewater discharge system is arranged as a unit, and the design flow is 5-20t/h. Each current continuous drainage system discharges about 2t/h of continuous drainage waste water, the continuous drainage system cannot be put into operation normally, the continuous drainage waste water is directly discharged to a fixed drainage expansion vessel, flash steam is directly emptied through fixed drainage expansion, flash water is directly discharged, a large amount of working media and heat are lost, pollution of surrounding environment is caused, and potential safety hazards exist due to icing phenomenon in winter. Steam drum boiler pressure 17.5MPa (saturated water specific enthalpy 1710.76 kj/kg) at 4X 2t/h, annual operating hours 8000: working fluid loss = 4 x 2 x 8000 = 6.4 ten thousand t; heat loss=4×2×8000× 1710.76 =10.95 kj, corresponding to standard coal 3736t.

200t/h of superheated steam (0.8 MPa, 300 ℃ and 3056.92 kj/kg) provided outside the plant, namely, higher-quality superheated steam (0.98 MPa, 340 ℃ and 3137.35 kj/kg) is adopted, and the temperature of the superheated steam is reduced by boiler feed water; the continuous water is directly discharged.

TABLE 1

The recovery system described in the new embodiment 1-2, wherein the continuous waste water is flashed by the continuous flash vessel, partially converted into saturated steam, enters the steam mixer to be mixed with the source superheated steam, and is purified by the steam purifier. According to 200t/h of final external supply superheated steam, 78.2% of heat and 48.3% of working medium in 8t/h continuous wastewater can be recovered, 8.57 ten thousand GJ of heat and 3.09 ten thousand tons of working medium can be recovered annually, as shown in Table 1. Finally, the heat and the working medium are converted into high-quality qualified steam for industrial steam supply. Saturated water of the continuous row of expansion vessels can heat in winter and heat industrial water in summer.

The continuous waste water can be directly sprayed into the superheated steam through a steam-water mixer and then purified through a steam purifier. According to 200t/h of final external supply superheated steam, 83.2% of heat and 83.2% of working medium in 8t/h continuous wastewater can be recovered, 9.11 ten thousand GJ of heat and 5.33 ten thousand tons of working medium can be recovered annually, as shown in Table 1. Finally, the heat and the working medium are converted into high-quality qualified steam for industrial steam supply. The rest part of the continuous waste water can be used for heating in winter and heating industrial water in summer.

Benefit analysis:

after the recovery system described in the embodiments 1-2 is adopted, the continuous waste water is flash evaporated and recovered into high-quality superheated steam through the flash evaporator, and the benefits of the recovery into high-quality steam through direct injection in the present case are respectively: 350.49 ten thousand yuan and 372.83 ten thousand yuan (without working medium, the unit price of the standard coal is 1200 yuan/t). The parameters of providing high quality superheater steam are: 0.8MPa, 300 ℃ and 3056.92kj/kg.

Example 4

Some alumina factories are provided with 2X 410t/h fluidized beds, 250 MW back pressure units are arranged, and the process supplies steam at high pressure of 170t/h (8.5 MPa, 320 ℃) and steam at low pressure of 300t/h (0.6 MPa, 250 ℃ and 2957.65 kj/kg); a low pressure steam source (0.8826 MPa, 266 ℃, 2983 kj/kg); the original low-pressure steam supply is realized by adopting low-pressure steam source steam through temperature and pressure reduction, and the temperature reduction water is desalted water (0.6 MPa, 20 ℃ and 84.48 kj/kg) at 20 ℃.

The two furnaces are provided with a unit continuous discharge capacity expansion system, and the actual continuous discharge waste water is directly introduced into an alumina industrial mixed heat exchange system to heat red mud washing water. The total amount of the continuous waste water is about 10t/h and the single unit is 5t/h under the influence of the quality of the alumina backwater. The waste heat of the alumina roasting flue gas is recycled through technical improvement, the heat exchange from waste water discharged continuously to red mud washing water is not needed any more, and the waste heat and working medium of the part are required to be recycled. Calculated as drum pressure 10MPa (saturated water specific enthalpy 1407.87 kj/kg), annual operating hour 8000: working fluid loss = 2 x 5 x 8000 = 8 ten thousand t; heat loss=2×5×8000× 1407.87 =11.26 kj, corresponding to standard coal 3840.67t.

TABLE 2

The recovery system described in the new embodiment 1-2, the continuous waste water is flash-evaporated by the continuous flash vessel, part of the waste water is converted into saturated steam, and the saturated steam enters the steam mixer 2 to be mixed with the superheated steam, and then is purified by the steam purifier 3. According to the calculation of 300t/h of final external supply superheated steam, 69.2% of heat and 35.4% of working medium in 10t/h continuous wastewater can be recovered, 7.8 ten thousand GJ of heat and 2.83 ten thousand tons of working medium can be recovered annually, as shown in Table 2. Finally, the heat and the working medium are converted into high-quality qualified steam for industrial steam supply. Saturated water of the continuous row of expansion vessels can heat in winter and heat industrial water in summer.

The continuous waste water can be directly sprayed into the superheated steam through a steam-water mixer and then purified through a steam purifier. According to the calculation of 300t/h of final external supply superheated steam, 32.9% of heat and 32.9% of working medium in 10t/h continuous wastewater can be recovered, and 3.7 ten thousand GJ of heat and 2.63 ten thousand tons of working medium can be recovered annually, as shown in Table 2. Finally, the heat and the working medium are converted into high-quality qualified steam for industrial steam supply. The rest part of the continuous waste water can be used for heating in winter and heating industrial water in summer.

Benefit analysis:

after the recovery system described in the embodiments 1-2 is adopted, the continuous waste water is flash evaporated and recovered into high-quality superheated steam through the flash evaporator, and the benefits of the recovery into high-quality steam through direct injection in the present case are respectively: 318.99 ten thousand yuan and 151.57 ten thousand yuan (without working medium, the unit price of the standard coal is 1200 yuan/t). The parameters of providing high quality superheater steam are: 0.6MPa, 250 ℃ and 2957.65kj/kg.

Example 5

The source of a certain thermal power plant is a 2X 330MW water-cooled pure condensing unit, the continuous waste water discharge units are arranged, and the design flow is 5-20t/h; in recent years, the device is changed into a heating and industrial steam extraction unit due to factors such as rapid price rising of coal price; the design of heating area is 1140 ten thousand square meters, and the actual heating area is 200 ten thousand square meters, and heating and steam supply are: 0.15MPa, 230 ℃, 150t/h and 2932.96kj/kg; industrial steam supply: the method is divided into medium-pressure steam supply A:3.2MPa, 306 ℃, 100t/h, 3003.5kj/kg, industrial low-pressure steam supply B:2.3MPa, 296 ℃, 400t/h and 3005.99kj/kg. Each current continuous drainage system discharges 3t/h continuous drainage waste water, the continuous drainage system is not normally put into operation all the time, the continuous drainage waste water is directly discharged to a continuous drainage expansion vessel, flash steam is directly emptied through expansion, the flash steam is directly discharged, a large amount of working media and heat are lost, pollution of the surrounding environment is caused, and potential safety hazards exist due to icing in winter. Steam drum boiler pressure 17.5MPa (saturated water specific enthalpy 1710.76 kj/kg) at 2X 3t/h, annual operating hours 8000: working fluid loss = 2 x 3 x 8000 = 4.8 ten thousand t; heat loss=2×3×8000× 1710.76 =8.21 kj, which corresponds to standard coal 2800t.

The plant supplies steam by adopting main steam (16.7 MPa, 540 ℃ and 3404.27 kj/kg) for decompression and temperature reduction (desalted water: 3.2MPa, 20 ℃ and 86.93 kj/kg). The low-pressure steam supply heat is far greater than the medium-pressure steam supply, and the continuous waste water can be consumed more, so the embodiment selects the low-pressure steam supply to consume the continuous waste water.

TABLE 3 Table 3

The recovery system described in the new embodiment 1-2, the continuous waste water is flash-evaporated by the continuous flash vessel, part of the waste water is converted into saturated steam, and the saturated steam enters the steam mixer 2 to be mixed with the superheated steam, and then is purified by the steam purifier 3. According to the calculation of 400t/h of final external supply superheated steam, 67.7% of heat and 41.4% of working medium in 6t/h continuous waste water can be recovered, 5.56 ten thousand GJ of heat and 1.99 ten thousand tons of working medium can be recovered annually, and finally, the heat and the working medium are converted into high-quality qualified steam for industrial steam supply, as shown in Table 3. Saturated water of the continuous row of expansion vessels can heat in winter and heat industrial water in summer.

The continuous waste water can be directly sprayed into the superheated steam through a steam-water mixer and then purified through a steam purifier. According to the calculation of 400t/h of final external supply superheated steam, 100% of heat and 100% of working medium in 6t/h continuous waste water can be recovered, 8.21 kilo GJ heat and 4.8 kilo tons of working medium can be recovered annually, and the heat and the working medium can be finally converted into high-quality qualified steam for industrial steam supply as shown in Table 3.

Benefit analysis:

after the recovery system described in the embodiments 1-2 is adopted, the continuous waste water is flash evaporated and recovered into high-quality superheated steam through the flash evaporator, and the benefits of the recovery into high-quality steam through direct injection in the present case are respectively: 227.58 ten thousand yuan and 336.02 ten thousand yuan (without working medium, the unit price of the standard coal is 1200 yuan/t). The parameters of providing high quality superheater steam are: 2.3MPa, 296 ℃ and 3005.99kj/kg.

By comparing examples 3-5, examples 1-2 provide two working medium and heat recovery modes of continuous wastewater: firstly, after flash evaporation by adopting a continuous flash evaporator, converting the working medium and heat of flash evaporation saturated steam into high-quality superheated steam; and secondly, directly atomizing and spraying the continuous waste water, and converting all working media and heat of the sprayed continuous waste water into high-quality superheated steam. The two input modes are different in source superheated steam flow, specific enthalpy and continuous waste water flow, and the quantity of converting continuous waste water into high-quality superheated steam is different, so that users are required to select according to actual requirements.

Various modifications and variations of the present utility model will be apparent to those skilled in the art in light of the foregoing teachings and are intended to be included within the scope of the following claims.

Claims

1. The continuous waste water high-quality recovery system based on the superheated steam purifier is characterized by comprising a continuous expansion vessel, a steam mixer and a steam purifier; the continuous waste water pipeline is connected with the input port of the continuous expansion vessel through a stop valve; the flash water outlet of the row of flash tanks is connected with a flash water pipeline; the steam mixer is provided with a first steam inlet and a second steam inlet, a saturated steam outlet of the continuous row of expansion vessels is connected with the first steam inlet of the steam mixer through a one-way valve, and a source superheated steam pipeline is connected with the second steam inlet through a stop valve; the outlet of the steam mixer is connected with the superheated steam inlet of the steam purifier through a one-way valve; the outlet of the steam purifier is connected with a steam supply pipeline.

2. The continuous-flow high-quality recovery system based on a superheated steam purifier according to claim 1, further comprising a steam-water mixer; the continuous waste water discharge pipeline and the source superheated steam pipeline are respectively connected with the inlet of the steam-water mixer; the outlet of the steam-water mixer is connected with the superheated steam inlet of the steam purifier.

3. The continuous waste water high quality recovery system based on superheated steam purifier according to claim 1 or 2, characterized in that the steam purifier comprises a purifier body, a superheated steam inlet, a superheated steam outlet and a nanofiltration unit tube bundle; the purifier body is respectively provided with a superheated steam inlet and a superheated steam outlet; the nano-filtration unit tube bundle is arranged in the purifier body and is positioned between a front cavity and a rear cavity in the purifier body, the nano-filtration unit tube bundle is composed of a plurality of nano-filtration tubes, the front end tube orifices of the nano-filtration tubes are closed, and the rear end tube orifices of the nano-filtration tubes are open; the front end and the middle part of the nano-filtration unit tube bundle are supported by the tube bundle, and the rear end is supported by the tube plate; the tube plate is fixed with the outer tube wall at the rear end of the nano filter tube in a sealing way.

4. The continuous wastewater high-quality recovery system based on a superheated steam purifier as claimed in claim 3, wherein the nano filter tube is made of foam metal material, and has a temperature resistance of > 500 ℃.

5. The continuous wastewater high-quality recovery system based on the superheated steam purifier as claimed in claim 3, wherein the top of the rear chamber of the purifier body is provided with a demineralized water flushing port; and a flushing water outlet is arranged at the bottom of the front cavity of the purifier body.

6. The continuous waste water high-quality recovery system based on a superheated steam purifier as claimed in claim 5, wherein the steam purifier further comprises a steam inlet temperature pressure measuring point and a steam outlet temperature pressure measuring point, and the steam inlet temperature pressure measuring point and the steam outlet temperature pressure measuring point are respectively arranged at an inlet pipe section and an outlet pipe section of the steam purifier.

7. The continuous wastewater high-quality recovery system based on a superheated steam purifier according to claim 3, wherein the portion of the inlet pipe section of the steam purifier connected to the purifier body is perpendicular to the purifier body.

8. The continuous wastewater high-quality recovery system based on the superheated steam purifier as claimed in claim 3, wherein the purifier body is further provided with a front chamber manhole and a rear chamber manhole; the front cavity manhole corresponds to the center of the front end cover of the purifier body; the back chamber manhole is positioned at the top of the back chamber of the purifier body.

9. The continuous waste water high-quality recovery system based on the superheated steam purifier as claimed in claim 3, wherein the purifier body is further provided with a front end cover and a rear end cover, the front end cover is arc-shaped, and is connected with the front end of the front cavity of the purifier body by adopting a flange and high-strength bolts; the rear end cover is arc-shaped and is connected with the rear end of the rear chamber of the purifier body through a flange and high-strength bolts.