CN113735209A

CN113735209A - Full-quantification landfill leachate treatment device and process

Info

Publication number: CN113735209A
Application number: CN202111057200.7A
Authority: CN
Inventors: 王鹏; 瞿艳军; 汪伟伟; 柳翔; 郭晓静
Original assignee: Beijing Jingwei Environmental Technology Co ltd
Current assignee: Beijing Jingwei Environmental Technology Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2021-12-03

Abstract

The invention relates to a full-quantification landfill leachate treatment device.A circulating liquid outlet and a circulating liquid inlet of a primary separation chamber are respectively connected with an inlet and an outlet of a primary circulating evaporator; the steam inlet of the steam purification system is connected with the steam outlet of the primary separation chamber; the steam inlet and the steam outlet of the first-stage steam compressor are respectively connected with the steam outlet of the steam purification system and the secondary steam inlet of the first-stage circulating evaporator; the steam inlet of the second-stage steam compressor is connected with the steam outlet of the first-stage steam compressor; the steam inlet and the circulating liquid inlet of the secondary circulating evaporator are respectively connected with the steam outlet of the secondary steam compressor and the circulating liquid outlet of the primary separating chamber; the second-stage separation chamber is connected with a second-stage circulating evaporator, and the second-stage separation chamber is connected with a steam purification system; the third-stage vapor compressor is connected with the second-stage vapor compressor; the dryer is connected with a three-stage steam compressor, the dryer is connected with a two-stage separation chamber, and the dryer is connected with a steam purification system. The forced circulation process with high circulation ratio is adopted, the anti-scaling performance of the system is good, and the continuous stable operation period is longer than 20 days.

Description

Full-quantification landfill leachate treatment device and process

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a full-quantification landfill leachate treatment device and process.

Background

The landfill leachate contains refractory organic matters, ammonia nitrogen and various inorganic salts and is brownish black. High-concentration landfill leachate can not be biochemically treated, and meanwhile, because the salt content is high, no proper reverse osmosis membrane can be subjected to reduction treatment at present. High-concentration landfill leachate containing a large amount of pollutants seriously threatens surface water, underground water, soil environment and the like, cannot be directly discharged into the environment, and is a difficult problem which needs to be solved when various technologies are applied to leachate treatment by reasonable treatment and disposal.

The MVR (Mechanical Vapor Recompression) evaporation technology is an evaporation technology for recycling latent heat of steam, avoids energy waste caused by condensing and discharging secondary steam, saves a condensing system, simplifies equipment flow, greatly simplifies operation, meets the technical requirements of energy conservation and emission reduction in China at present, and is considered as a wastewater treatment technology with great development potential. MVR evaporation is a technique that uses secondary steam as heating steam after its temperature and pressure are raised by mechanical compression. The mechanical vapor recompression principle is shown in figure 1, waste water enters a system, is mixed with returned mother liquor and circulating liquid and then enters an evaporator, heat absorption and evaporation are carried out, evaporated steam (secondary steam) is sucked by a compressor, is input into the evaporator after compression, temperature and pressure rise and then is subjected to heat release and condensation, condensed water is used as water for other processes or is directly discharged after reaching the standard, evaporated concentrated waste water is precipitated in the form of crystals by solute dissolved in the waste water when the concentration reaches the saturation solubility, and then the concentrated waste water is changed into a mixture (crystal slurry) of the crystals and the mother liquor. The crystal slurry is discharged from the evaporator, most of the crystal slurry is used as circulating liquid to continue the process, and the other small part of the crystal slurry is discharged into a separator. The crystal and the mother liquid in the crystal slurry are separated by the separator, the separated mother liquid returns to the system to continue to participate in circulation, and the separated crystal can be used as solid waste to be buried or reused. Therefore, the salt and liquid separation of the high-concentration salt-containing wastewater is realized. The whole process shows that the method can completely treat the waste water and can realize the aim of zero discharge of the landfill leachate.

The evaporator form that can be applied to the MVR technique is more, because high enriched landfill leachate has high COD, high ammonia nitrogen, the high characteristics that contain the salt, ordinary traditional evaporator easily appears scale deposit, blocks up, heat exchange efficiency and descends the scheduling problem to bring about drawbacks such as operating cycle weak point, cleaning cost height, equipment life weak point, consequently select a suitable evaporator form to be the problem that the MVR technique is applied to high enriched landfill leachate at first needs to be solved.

At present, most of drying treatment devices are used for drying by a rotary drum scraper, flash evaporation drying and the like, the drying devices all need heat sources to provide drying effects, the heat sources comprise steam heat sources and heat conduction oil heat sources, and steam or other fuels cannot be provided in many project addresses needing drying, and only electric energy can be provided. If the electric energy or other fuels are directly used for providing the heat source for drying, the heat required by the drying process is extremely high, and meanwhile, the heat cannot be recycled, which provides new challenges and difficulties for the drying technology.

Although the MVR evaporation technology has solved the problem of energy waste, there still exist problems to be solved urgently in the treatment effect of the wastewater: the concentrate of production is irritated again and can be leaded to whole heat exchange efficiency to descend, if carry out the mummification to the concentrate, need additionally provide the heat source again, is steam usually, has increased the degree of difficulty undoubtedly to some places.

Disclosure of Invention

The invention aims to solve the technical problem of providing a full-quantification landfill leachate treatment device and process so as to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: a full-scale landfill leachate treatment plant, comprising:

a circulating liquid inlet of the primary circulating evaporator is connected with high-concentration landfill leachate;

a circulating liquid inlet of the first-stage separation chamber is connected with a circulating liquid outlet of the first-stage circulating evaporator, and a circulating liquid outlet of the first-stage separation chamber is connected with a circulating liquid inlet of the first-stage circulating evaporator;

the steam inlet of the steam purification system is connected with the steam outlet of the primary separation chamber;

the steam inlet of the first-stage steam compressor is connected with the steam outlet of the steam purification system, and the steam outlet of the first-stage steam compressor is connected with the secondary steam inlet of the first-stage circulating evaporator;

the steam inlet of the second-stage steam compressor is connected with the steam outlet of the first-stage steam compressor;

the steam inlet of the second-stage circulating evaporator is connected with the steam outlet of the second-stage steam compressor, and the circulating liquid inlet of the second-stage circulating evaporator is connected with the circulating liquid outlet of the first-stage separation chamber;

and a circulating liquid inlet of the second-stage separation chamber is connected with a circulating liquid outlet of the second-stage circulating evaporator, a circulating liquid outlet of the second-stage separation chamber is connected with a circulating liquid inlet of the second-stage circulating evaporator, and a steam outlet of the second-stage separation chamber is connected with a steam inlet of the steam purification system.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, still include:

and a steam inlet of the dryer is connected with a steam outlet of the secondary steam compressor, a circulating liquid inlet of the dryer is connected with a circulating liquid outlet of the secondary separation chamber, and a steam outlet of the dryer is connected with a steam inlet of the steam purification system.

Further, still include:

and a steam inlet of the three-stage steam compressor is connected with a steam outlet of the two-stage steam compressor, and a steam outlet of the three-stage steam compressor is connected with a steam inlet of the dryer.

Further, the pressure of the secondary steam output by the first-stage steam compressor is 30 kPaA-200 kPaA, and the temperature is 70-120 ℃.

Further, the pressure of the secondary steam output by the secondary steam compressor is 50 kPaA-280 kPaA, and the temperature is 80-130 ℃.

Further, the pressure of the secondary steam output by the three-stage steam compressor is 70 kPaA-370 kPaA, and the temperature is 90-140 ℃.

Further, the temperature of the landfill leachate sent into the primary separation chamber by the primary circulating evaporator is 65-115 ℃.

And the system further comprises a primary circulating pump, wherein the outlet of the primary circulating pump is connected with a circulating liquid inlet of the primary circulating evaporator, and the inlet of the primary circulating pump is connected with a circulating liquid outlet of the primary separating chamber and the high-concentration landfill leachate.

And the circulating system further comprises a second-stage circulating pump, wherein the outlet of the second-stage circulating pump is connected with a circulating liquid inlet of the second-stage circulating evaporator, and the inlet of the second-stage circulating pump is connected with a circulating liquid outlet of the first-stage separating chamber and a circulating liquid outlet of the second-stage separating chamber.

Further, still include waste heat recovery system, waste heat recovery system includes:

the inlet of the liquid inlet pump is connected with high-concentration landfill leachate;

the inlet of the cold side of the distilled water heat exchanger is connected with the outlet of the liquid inlet pump;

the hot side inlet of the distilled water cooler is connected with the hot side outlet of the distilled water heat exchanger, the hot side outlet of the distilled water cooler is connected with the delivery pipeline, the cold side inlet of the distilled water cooler is connected with the circulating cooling water supply branch pipe, and the cold side outlet of the distilled water cooler is connected with the circulating cooling water return branch pipe;

a liquid outlet of the distilled water tank is connected with a hot side inlet of the distilled water heat exchanger through a distilled water pump, and a liquid inlet of the distilled water tank is connected with a distilled water outlet of the primary circulating evaporator, a distilled water outlet of the secondary circulating evaporator and a distilled water outlet of the dryer;

the cold side inlet of the non-condensable gas heat exchanger is connected with the hot side outlet of the distilled water heat exchanger, the cold side outlet of the non-condensable gas heat exchanger is connected with the inlet of the primary circulating pump, and the hot side inlet of the non-condensable gas heat exchanger is connected with the non-condensable gas outlet of the primary circulating evaporator, the non-condensable gas outlet of the secondary circulating evaporator and the non-condensable gas outlet of the dryer;

the hot side inlet of the non-condensable gas cooler is connected with the hot side outlet of the non-condensable gas heat exchanger, the cold side inlet of the non-condensable gas cooler is connected with the circulating cooling water supply branch pipe, and the cold side outlet of the non-condensable gas cooler is connected with the circulating cooling water return branch pipe;

the inlet of the vacuum pump is connected with the hot side outlet of the non-condensable gas cooler;

the inlet of the tail gas buffer cylinder is connected with the outlet of the vacuum pump;

and the inlet of the deodorization system is connected with the outlet of the tail gas buffer cylinder.

Further, the temperature of the high-concentration landfill leachate sent into the primary circulating pump by the noncondensable gas heat exchanger is 60-95 ℃.

Further, the vapor purification system includes:

the steam inlet of the expansion tank is connected with the steam outlet of the primary separation chamber, the steam outlet of the secondary separation chamber and the steam outlet of the dryer;

a steam inlet of the acid washing steam device is connected with a steam outlet of the expansion tank;

and a steam inlet of the alkaline washing steam device is connected with a steam outlet of the acid washing steam device, and a steam outlet of the alkaline washing steam device is connected with a steam inlet of the primary steam compressor.

A full-quantification landfill leachate treatment process comprises the following steps:

the high-concentration landfill leachate to be treated flows into a distilled water heat exchanger through a liquid inlet pump, exchanges heat with distilled water in the distilled water heat exchanger, then flows into a non-condensable gas heat exchanger to exchange heat with non-condensable gas, and the high-concentration landfill leachate is heated to 60-95 ℃;

the non-condensable gas after heat exchange in the non-condensable gas heat exchanger flows into a non-condensable gas cooler and exchanges heat with circulating cooling water in the non-condensable gas cooler again to realize cooling again, and the non-condensable gas flowing out of the non-condensable gas cooler flows to a vacuum pump, a tail gas buffer cylinder and a deodorization system in sequence;

the distilled water after heat exchange in the distilled water heat exchanger flows into the distilled water cooler and exchanges heat with the circulating cooling water in the distilled water cooler again to realize cooling again, and finally the distilled water generated by the distilled water cooler flows out;

the high-concentration landfill leachate flowing out of the non-condensable gas heat exchanger flows into a tube pass of a heating section of a primary circulating evaporator through a primary circulating pump, and exchanges heat with secondary steam in a shell pass of the heating section of the primary circulating evaporator to reach a boiling point;

the non-condensable gas generated by the primary circulating evaporator flows into the non-condensable gas heat exchanger, and the distilled water generated by the primary circulating evaporator flows into the distilled water tank;

the landfill leachate reaching the boiling point flows into a primary separation chamber, gas-liquid two-phase separation occurs in the primary separation chamber, and the separated secondary steam flows into a steam purification system for washing and purification;

the purified secondary steam flows into a first-stage steam compressor to be heated and boosted, part of the secondary steam flowing out of the first-stage steam compressor returns to the shell pass of the heating section of the first-stage circulating evaporator to be used as an evaporation heat source for heat exchange and is condensed into distilled water, and the condensed distilled water flows into a distilled water tank;

one part of the liquid phase separated from the primary separation chamber flows back into the primary circulation evaporator through the primary circulation pump for circulation, and the other part flows into the secondary circulation evaporator through the secondary circulation pump;

the landfill leachate reaching the boiling point enters a secondary circulating evaporator and exchanges heat with secondary steam in a heating section shell pass of the secondary circulating evaporator;

the other part of the secondary steam flowing out from the first-stage steam compressor flows into the second-stage steam compressor for secondary temperature and pressure rise, and one part of the secondary steam heated and pressurized by the second-stage steam compressor returns to the shell pass of the heating section of the second-stage circulating evaporator to be used as an evaporation heat source for heat exchange and is condensed into distilled water;

the non-condensable gas generated by the secondary circulating evaporator flows into the non-condensable gas heat exchanger, and the distilled water generated by the secondary circulating evaporator flows into the distilled water tank;

the landfill leachate flowing out of the secondary circulating evaporator flows into a secondary separation chamber, gas-liquid two-phase separation is carried out in the secondary separation chamber, and the separated secondary steam flows into a steam purification system for washing and purification;

one part of the liquid phase separated from the secondary separation chamber flows back into the secondary circulation evaporator through the secondary circulation pump to be circulated, and the other part flows into the dryer;

the other part of the secondary steam flowing out of the secondary steam compressor flows into the tertiary steam compressor, is heated and pressurized again by the tertiary steam compressor and then flows into the dryer, and the liquid phase flowing into the dryer from the secondary separation chamber is subjected to heat exchange and drying;

the dried secondary steam flows into a steam purification system for purification and washing, and the concentrated solution is dried and then transported to the outside for landfill;

the non-condensable gas generated by the dryer flows into the non-condensable gas heat exchanger, and the distilled water generated by the dryer flows into the distilled water tank, so that the whole treatment process is completed.

The invention has the beneficial effects that:

1) the forced circulation process with high circulation ratio is adopted, the anti-scaling performance of the system is good, and the continuous stable operation period is more than 20 days;

2) the dryer does not need to provide a heat source independently, and can be electrified;

3) no concentrated solution is generated, and the full-scale treatment is carried out;

4) a steam purification system is adopted to directly remove ammonia nitrogen and organic matters in the polluted steam in a gas phase state, so that the quality of produced water can directly reach the standard;

5) the waste heat recovery system recovers the heat of the discharged non-condensable gas (80-120 ℃) and the high-temperature distilled water (80-105 ℃), the recovered heat heats the landfill leachate sent by the water inlet pump to 60-95 ℃, the high-temperature distilled water with the recovered heat is further reduced to 35-55 ℃ by circulating cooling water and is discharged, and the energy-saving effect is obvious;

6) the water yield (total daily water yield/total daily water inflow) is 70-90%, and the final water yield can reach the discharge standard specified in table 2 in the control standard of domestic refuse landfill GB 16889-2008.

Drawings

FIG. 1 is a schematic diagram of a prior art MVR system;

fig. 2 is a layout diagram of the full-scale landfill leachate treatment device according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. one-level circulation evaporator, 2, one-level separation chamber, 3, one-level vapor compressor, 4, second grade vapor compressor, 5, second grade circulation evaporator, 6, second grade separation chamber, 7, third grade vapor compressor, 8, the desiccator, 9, one-level circulating pump, 10, the second grade circulating pump, 11, the feed liquor pump, 12, the distilled water heat exchanger, 13, the distilled water cooler, 14, the distilled water jar, 15, the noncondensable gas heat exchanger, 16, the noncondensable gas cooler, 17, the vacuum pump, 18, the tail gas buffer cylinder, 19, the deodorization system, 20, the expansion tank, 21, the pickling vapour device, 22, the alkali washing vapour device, 23, the distilled water pump.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

Example 1

As shown in fig. 2, a full-scale landfill leachate treatment device comprises:

the system comprises a primary circulating evaporator 1, a primary separation chamber 2, a steam purification system, a primary steam compressor 3, a secondary steam compressor 4, a secondary circulating evaporator 5, a secondary separation chamber 6, a tertiary steam compressor 7 and a dryer 8;

a circulating liquid inlet of the primary circulating evaporator 1 is connected with high-concentration landfill leachate;

a circulating liquid inlet of the primary separating chamber 2 is connected with a circulating liquid outlet of the primary circulating evaporator 1, and a circulating liquid outlet of the primary separating chamber 2 is connected with a circulating liquid inlet of the primary circulating evaporator 1, namely, the landfill leachate reaching the boiling point in the primary circulating evaporator 1 can flow into the primary separating chamber 2 and undergo gas-liquid two-phase separation in the primary separating chamber 2, and a part of separated liquid phase can be sent back to the primary circulating evaporator 1 for circulation;

a steam inlet of the steam purification system is connected with a steam outlet of the primary separation chamber 2, namely, the gas phase separated from the primary separation chamber 2 is sent into the steam purification system for purification;

the steam inlet of the first-stage steam compressor 3 is connected with the steam outlet of the steam purification system, and the steam outlet of the first-stage steam compressor 3 is connected with the secondary steam inlet of the first-stage circulating evaporator 1;

the steam inlet of the second-stage steam compressor 4 is connected with the steam outlet of the first-stage steam compressor 3;

a steam inlet of the secondary circulating evaporator 5 is connected with a steam outlet of the secondary steam compressor 4, and a circulating liquid inlet of the secondary circulating evaporator 5 is connected with a circulating liquid outlet of the primary separating chamber 2;

a circulating liquid inlet of the secondary separation chamber 6 is connected with a circulating liquid outlet of the secondary circulating evaporator 5, a circulating liquid outlet of the secondary separation chamber 6 is connected with a circulating liquid inlet of the secondary circulating evaporator 5, and a steam outlet of the secondary separation chamber 6 is connected with a steam inlet of the steam purification system;

the steam inlet of the third-stage steam compressor 7 is connected with the steam outlet of the second-stage steam compressor 4;

the steam inlet of the dryer 8 is connected with the steam outlet of the three-stage steam compressor 7, the circulating liquid inlet of the dryer 8 is connected with the circulating liquid outlet of the second-stage separation chamber 6, and the steam outlet of the dryer 8 is connected with the steam inlet of the steam purification system.

The high-concentration landfill leachate exchanges heat with secondary steam which is heated and boosted by a primary steam compressor 3 in a heating section shell pass of a primary circulating evaporator 1 to reach a boiling point;

the landfill leachate reaching the boiling point enters a primary separation chamber 2, gas-liquid two-phase separation occurs in the primary separation chamber 2, and the separated secondary steam is sent to a steam purification system for washing and purification;

the purified secondary steam is sent into a first-stage steam compressor 3 to be heated and pressurized, and then returns to the shell side of the heating section of the first-stage circulating evaporator 1 to be used as an evaporation heat source for heat exchange and condensed into distilled water;

one part of the liquid phase separated from the primary separation chamber 2 flows back into the primary circulation evaporator 1 for circulation, the other part of the liquid phase is sent into the secondary circulation evaporator 5, the working principle of the secondary circulation evaporator 5 is the same as that of the primary circulation evaporator 1,

the landfill leachate reaching the boiling point in the secondary circulating evaporator 5 enters a secondary separation chamber 6, gas-liquid two-phase separation occurs in the secondary separation chamber 6, and the separated secondary steam is sent into a steam purification system for washing and purification;

the purified secondary steam is sent into a first-stage steam compressor 3 for temperature rise and pressure rise, and then is heated and pressure rise by a second-stage steam compressor 4, one part of the secondary steam returns to the shell pass of the heating section of a second-stage circulating evaporator 5 to be used as an evaporation heat source for heat exchange and is condensed into distilled water, and the other part of the secondary steam is sent into a third-stage steam compressor 7, is heated and pressure rise by the third-stage steam compressor 7 and is sent into a dryer 8;

part of the liquid phase separated from the secondary separation chamber 6 flows back to the secondary circulation evaporator 5 for circulation, and the other part enters the dryer 8.

Example 2

As shown in fig. 2, this embodiment is further optimized based on embodiment 1, and it specifically includes the following steps:

the pressure of the secondary steam output by the primary steam compressor 3 is 30 kPaA-200 kPaA, and the temperature is 70-120 ℃.

Example 3

As shown in fig. 2, this embodiment is further optimized based on embodiment 1 or 2, and it specifically includes the following steps:

the pressure of the secondary steam output by the secondary steam compressor 4 is 50 kPaA-280 kPaA, and the temperature is 80-130 ℃.

Example 4

As shown in fig. 2, this embodiment is further optimized based on

embodiment

1, 2 or 3, and it is specifically as follows:

the pressure of the secondary steam output by the three-stage steam compressor 7 is 70 kPaA-370 kPaA, and the temperature is 90-140 ℃.

Example 5

As shown in fig. 2, this embodiment is further optimized based on any one of embodiments 1 to 4, and specifically includes the following steps:

the temperature of the landfill leachate sent into the primary separation chamber 2 by the primary circulating evaporator 1 is 65-115 ℃ (the boiling point of the landfill leachate).

Example 6

As shown in fig. 2, this embodiment is further optimized based on any one of embodiments 1 to 5, and specifically includes the following steps:

the full-quantification landfill leachate treatment device further comprises a primary circulating pump 9, an outlet of the primary circulating pump 9 is connected with a circulating liquid inlet of the primary circulating evaporator 1, and an inlet of the primary circulating pump 9 is connected with a circulating liquid outlet of the primary separating chamber 2 and the high-concentration landfill leachate.

Example 7

As shown in fig. 2, this embodiment is further optimized based on any one of embodiments 1 to 6, and specifically includes the following steps:

the full-quantification landfill leachate treatment device further comprises a second-stage circulating pump 10, an outlet of the second-stage circulating pump 10 is connected with a circulating liquid inlet of the second-stage circulating evaporator 5, and an inlet of the second-stage circulating pump 10 is connected with a circulating liquid outlet of the first-stage separating chamber 2 and a circulating liquid outlet of the second-stage separating chamber 6.

Example 8

As shown in fig. 2, this embodiment is further optimized based on embodiment 6 or 7, and it is specifically as follows:

the full-quantification landfill leachate treatment device further comprises a waste heat recovery system, and the waste heat recovery system comprises:

the system comprises a liquid inlet pump 11, a distilled water heat exchanger 12, a distilled water cooler 13, a distilled water tank 14, a non-condensable gas heat exchanger 15, a non-condensable gas cooler 16, a vacuum pump 17, a tail gas buffer cylinder 18, a deodorization system 19 and a distilled water pump 23;

the inlet of the liquid inlet pump 11 is connected with high-concentration landfill leachate;

the cold side inlet of the distilled water heat exchanger 12 is connected with the outlet of the liquid inlet pump 11;

a hot side inlet of the distilled water cooler 13 is connected with a hot side outlet of the distilled water heat exchanger 12, a hot side outlet of the distilled water cooler 13 is connected with an outgoing pipeline, a cold side inlet of the distilled water cooler 13 is connected with a circulating cooling water supply branch pipe, and a cold side outlet of the distilled water cooler 13 is connected with a circulating cooling water return branch pipe;

a liquid outlet of the distilled water tank 14 is connected with a hot side inlet of the distilled water heat exchanger 12 through a distilled water pump 23, and a liquid inlet of the distilled water tank 14 is respectively connected with a distilled water outlet of the primary circulating evaporator 1, a distilled water outlet of the secondary circulating evaporator 5 and a distilled water outlet of the dryer 8;

a cold side inlet of the non-condensable gas heat exchanger 15 is connected with a hot side outlet of the distilled water heat exchanger 12, a cold side outlet of the non-condensable gas heat exchanger 15 is connected with an inlet of the primary circulating pump 9, and a hot side inlet of the non-condensable gas heat exchanger 15 is respectively connected with a non-condensable gas outlet of the primary circulating evaporator 1, a non-condensable gas outlet of the secondary circulating evaporator 5 and a non-condensable gas outlet of the dryer 8;

a hot side inlet of the non-condensable gas cooler 16 is connected with a hot side outlet of the non-condensable gas heat exchanger 15, a cold side inlet of the non-condensable gas cooler 16 is connected with a circulating cooling water supply branch pipe, and a cold side outlet of the non-condensable gas cooler 16 is connected with a circulating cooling water return branch pipe;

the inlet of the vacuum pump 17 is connected with the hot side outlet of the non-condensable gas cooler 16;

the inlet of the tail gas buffer cylinder 18 is connected with the outlet of the vacuum pump 17;

the inlet of the deodorization system 19 is connected with the outlet of the tail gas buffer cylinder 18.

Example 9

As shown in fig. 2, this embodiment is further optimized based on embodiment 7 or 8, and it is specifically as follows:

the temperature of the high-concentration landfill leachate sent into the primary circulating pump 9 by the non-condensable gas heat exchanger 15 is 60-95 ℃.

Example 10

As shown in fig. 2, this embodiment is further optimized based on any one of embodiments 1 to 9, and specifically includes the following steps:

the vapor purification system includes: an expansion tank 20, an acid washing steam device 21 and an alkali washing steam device 22;

the steam inlet of the expansion tank 20 is respectively connected with the steam outlet of the primary separation chamber 2, the steam outlet of the secondary separation chamber 6 and the steam outlet of the dryer 8;

a steam inlet of the acid washing steam device 21 is connected with a steam outlet of the expansion tank 20;

a steam inlet of the alkali washing steam device 22 is connected with a steam outlet of the acid washing steam device 21, and a steam outlet of the alkali washing steam device 22 is connected with a steam inlet of the primary steam compressor 3;

removing ammonia nitrogen pollutants in the secondary dirty steam through acid washing, and removing organic matters in the steam through alkali washing; wherein the liquid-gas ratio (mass ratio) in the acid washing process is 10-200, and the liquid-gas ratio (mass ratio) in the alkali washing process is 20-350;

the secondary clean steam after acid and alkali washing is sent to a primary steam compressor 3 for temperature rise and pressure rise and then enters the evaporation process.

The drier 8 is preferably a rotary drum scraper drier, the drier 8 dries the concentrated solution generated by the secondary separation chamber 6, the steam of the secondary steam compressor 4 is heated and pressurized again through the tertiary steam compressor 7, and the heated and pressurized steam is subjected to heat exchange drying with the concentrated solution through the rotary drum scraper drier; secondary steam generated by drying sequentially enters an expansion tank 20, an acid washing steam device 21 and an alkali washing steam device 22 for purification and washing, and concentrated solution is dried and then is transported to the outside for landfill; the steam condensate water after heat exchange enters the distilled water tank 14; the produced non-condensable gas is introduced into the non-condensable gas heat exchanger 15.

The steam pressure passing through the first-stage steam compressor 3, the second-stage steam compressor 4 and the third-stage steam compressor 7 is respectively controlled by the corresponding three regulating valves.

the high-concentration landfill leachate to be treated flows into a distilled water heat exchanger 12 through a liquid inlet pump 11, exchanges heat with distilled water in the distilled water heat exchanger 12, then flows into a non-condensable gas heat exchanger 15 to exchange heat with non-condensable gas, and the high-concentration landfill leachate is heated to 60-95 ℃;

the non-condensable gas after heat exchange in the non-condensable gas heat exchanger 15 flows into the non-condensable gas cooler 16 and exchanges heat with circulating cooling water in the non-condensable gas cooler 16 again to realize temperature reduction again, and the non-condensable gas flowing out of the non-condensable gas cooler 16 flows to the vacuum pump 17, the tail gas buffer cylinder 18 and the deodorization system 19 in sequence;

the distilled water after heat exchange in the distilled water heat exchanger 12 flows into the distilled water cooler 13, and exchanges heat with the circulating cooling water in the distilled water cooler 13 again to realize temperature reduction again, and finally the distilled water generated by the distilled water cooler 13 flows out;

the high-concentration landfill leachate flowing out of the non-condensable gas heat exchanger 15 flows into the tube side of the heating section of the primary circulating evaporator 1 through the primary circulating pump 9 and exchanges heat with secondary steam in the shell side of the heating section of the primary circulating evaporator 1 to reach a boiling point;

the non-condensable gas generated by the primary circulating evaporator 1 flows into a non-condensable gas heat exchanger 15, and the distilled water generated by the primary circulating evaporator 1 flows into a distilled water tank 14;

the landfill leachate reaching the boiling point flows into the primary separation chamber 2, gas-liquid two-phase separation occurs in the primary separation chamber 2, and the separated secondary steam flows into a steam purification system for washing and purification;

wherein, the purified secondary steam flows into the first-stage vapor compressor 3 to raise the temperature and pressure, a part of the secondary steam flowing out of the first-stage vapor compressor 3 returns to the shell pass of the heating section of the first-stage circulating evaporator 1 to be used as an evaporation heat source for heat exchange and is condensed into distilled water, and the condensed distilled water flows into the distilled water tank 14;

one part of the liquid phase separated from the primary separation chamber 2 flows back into the primary circulation evaporator 1 for circulation through a primary circulation pump 9, and the other part flows into the secondary circulation evaporator 5 through a secondary circulation pump 10;

the landfill leachate reaching the boiling point enters a secondary circulating evaporator 5 and exchanges heat with secondary steam in a heating section shell pass of the secondary circulating evaporator 5;

wherein, the other part of the secondary steam flowing out from the first-stage steam compressor 3 flows into the second-stage steam compressor 4 for heating and boosting again, and one part of the secondary steam heated and boosted by the second-stage steam compressor 4 returns to the shell pass of the heating section of the second-stage circulating evaporator 5 to be used as an evaporation heat source for heat exchange and is condensed into distilled water;

the non-condensable gas generated by the secondary circulating evaporator 5 flows into a non-condensable gas heat exchanger 15, and the distilled water generated by the secondary circulating evaporator 5 flows into a distilled water tank 14;

the landfill leachate flowing out of the secondary circulating evaporator 5 flows into a secondary separation chamber 6, gas-liquid two-phase separation is carried out in the secondary separation chamber 6, and the separated secondary steam flows into a steam purification system for washing and purification;

one part of the liquid phase separated from the secondary separation chamber 6 flows back into the secondary circulation evaporator 5 through a secondary circulation pump 10 for circulation, and the other part flows into a drier 8;

the other part of the secondary steam flowing out of the secondary steam compressor 4 flows into the tertiary steam compressor 7, is heated and pressurized again by the tertiary steam compressor 7 and then flows into the dryer 8, and the liquid phase flowing into the dryer 8 from the secondary separation chamber 6 is subjected to heat exchange and drying;

the noncondensable gas generated by the dryer 8 flows into the noncondensable gas heat exchanger 15, and the distilled water generated by the dryer 8 flows into the distilled water tank 14, so that the whole treatment process is completed.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides a full-scale landfill leachate processing apparatus which characterized in that includes:

a primary circulating evaporator (1), wherein a circulating liquid inlet of the primary circulating evaporator is connected with high-concentration landfill leachate;

a first-stage separation chamber (2), wherein a circulating liquid inlet of the first-stage separation chamber is connected with a circulating liquid outlet of the first-stage circulating evaporator (1), and a circulating liquid outlet of the first-stage separation chamber is connected with a circulating liquid inlet of the first-stage circulating evaporator (1);

the steam inlet of the steam purification system is connected with the steam outlet of the primary separation chamber (2);

the steam inlet of the first-stage steam compressor (3) is connected with the steam outlet of the steam purification system, and the steam outlet of the first-stage steam compressor is connected with the secondary steam inlet of the first-stage circulating evaporator (1);

a second-stage vapor compressor (4), the vapor inlet of which is connected with the vapor outlet of the first-stage vapor compressor (3);

a steam inlet of the secondary circulating evaporator (5) is connected with a steam outlet of the secondary steam compressor (4), and a circulating liquid inlet of the secondary circulating evaporator is connected with a circulating liquid outlet of the primary separating chamber (2);

and a circulating liquid inlet of the secondary separation chamber (6) is connected with a circulating liquid outlet of the secondary circulating evaporator (5), a circulating liquid outlet of the secondary separation chamber is connected with a circulating liquid inlet of the secondary circulating evaporator (5), and a steam outlet of the secondary separation chamber is connected with a steam inlet of the steam purification system.

2. The apparatus of claim 1, wherein the apparatus comprises: further comprising:

and a steam inlet of the dryer (8) is connected with a steam outlet of the secondary steam compressor (4), a circulating liquid inlet of the dryer is connected with a circulating liquid outlet of the secondary separation chamber (6), and a steam outlet of the dryer is connected with a steam inlet of the steam purification system.

3. The apparatus of claim 2, wherein the apparatus comprises: further comprising:

and a steam inlet of the three-stage steam compressor (7) is connected with a steam outlet of the two-stage steam compressor (4), and a steam outlet of the three-stage steam compressor is connected with a steam inlet of the dryer (8).

4. The apparatus of claim 1, wherein the apparatus comprises: the temperature of the landfill leachate sent into the primary separation chamber (2) by the primary circulating evaporator (1) is 65-115 ℃.

5. The device for treating full-scale landfill leachate according to any one of claims 1 to 4, wherein: the device also comprises a primary circulating pump (9), the outlet of the primary circulating pump is connected with the circulating liquid inlet of the primary circulating evaporator (1), and the inlet of the primary circulating pump is connected with the circulating liquid outlet of the primary separating chamber (2) and the high-concentration landfill leachate.

6. The full-scale landfill leachate treatment device according to claim 5, wherein: the device also comprises a secondary circulating pump (10), the outlet of the secondary circulating pump is connected with the circulating liquid inlet of the secondary circulating evaporator (5), and the inlet of the secondary circulating pump is connected with the circulating liquid outlet of the primary separating chamber (2) and the circulating liquid outlet of the secondary separating chamber (6).

7. The apparatus of claim 5 or 6, wherein the apparatus comprises: still include waste heat recovery system, waste heat recovery system includes:

a liquid inlet pump (11), the inlet of which is connected with high-concentration landfill leachate;

a distilled water heat exchanger (12) with a cold side inlet connected with an outlet of the liquid inlet pump (11);

the hot side inlet of the distilled water cooler (13) is connected with the hot side outlet of the distilled water heat exchanger (12), the hot side outlet of the distilled water cooler is connected with the delivery pipeline, the cold side inlet of the distilled water cooler is connected with the circulating cooling water supply branch pipe, and the cold side outlet of the distilled water cooler is connected with the circulating cooling water return branch pipe;

a liquid outlet of the distilled water tank (14) is connected with a hot side inlet of the distilled water heat exchanger (12) through a distilled water pump (23), and a liquid inlet thereof is connected with a distilled water outlet of the primary circulating evaporator (1), a distilled water outlet of the secondary circulating evaporator (5) and a distilled water outlet of the dryer (8);

the cold side inlet of the non-condensable gas heat exchanger (15) is connected with the hot side outlet of the distilled water heat exchanger (12), the cold side outlet of the non-condensable gas heat exchanger is connected with the inlet of the primary circulating pump (9), and the hot side inlet of the non-condensable gas heat exchanger is connected with the non-condensable gas outlet of the primary circulating evaporator (1), the non-condensable gas outlet of the secondary circulating evaporator (5) and the non-condensable gas outlet of the dryer (8);

a non-condensable gas cooler (16), wherein a hot side inlet of the non-condensable gas cooler is connected with a hot side outlet of the non-condensable gas heat exchanger (15), a cold side inlet of the non-condensable gas cooler is connected with a circulating cooling water supply branch pipe, and a cold side outlet of the non-condensable gas cooler is connected with a circulating cooling water return branch pipe;

a vacuum pump (17), the inlet of which is connected with the hot side outlet of the non-condensable gas cooler (16);

an inlet of the tail gas buffer cylinder (18) is connected with an outlet of the vacuum pump (17);

and the inlet of the deodorization system (19) is connected with the outlet of the tail gas buffer cylinder (18).

8. The apparatus of claim 7, wherein the apparatus comprises: the temperature of the high-concentration landfill leachate sent into the primary circulating pump (9) by the non-condensable gas heat exchanger (15) is 60-95 ℃.

9. The apparatus of claim 1, wherein the apparatus comprises: the vapor purification system includes:

the steam inlet of the expansion tank (20) is connected with the steam outlet of the primary separation chamber (2), the steam outlet of the secondary separation chamber (6) and the steam outlet of the dryer (8);

a steam inlet of the acid washing steam device (21) is connected with a steam outlet of the expansion tank (20);

and a steam inlet of the alkaline washing steam device (22) is connected with a steam outlet of the acid washing steam device (21), and a steam outlet of the alkaline washing steam device is connected with a steam inlet of the primary steam compressor (3).

10. A full-quantification landfill leachate treatment process is characterized by comprising the following steps:

the high-concentration landfill leachate to be treated flows into a distilled water heat exchanger (12) through a liquid inlet pump (11), exchanges heat with distilled water in the distilled water heat exchanger (12), and then flows into a non-condensable gas heat exchanger (15) to exchange heat with non-condensable gas, so that the high-concentration landfill leachate is heated to 60-95 ℃;

the non-condensable gas after heat exchange in the non-condensable gas heat exchanger (15) flows into the non-condensable gas cooler (16) and exchanges heat with circulating cooling water in the non-condensable gas cooler (16) again to realize secondary cooling, and the non-condensable gas flowing out of the non-condensable gas cooler (16) flows to a vacuum pump (17), a tail gas buffer cylinder (18) and a deodorization system (19) in sequence;

distilled water after heat exchange in the distilled water heat exchanger (12) flows into the distilled water cooler (13) and exchanges heat with circulating cooling water in the distilled water cooler (13) again to realize temperature reduction again, and finally distilled water generated by the distilled water cooler (13) flows out;

the high-concentration landfill leachate flowing out of the non-condensable gas heat exchanger (15) flows into the tube side of the heating section of the primary circulating evaporator (1) through the primary circulating pump (9) and exchanges heat with secondary steam in the shell side of the heating section of the primary circulating evaporator (1) to reach a boiling point;

the non-condensable gas generated by the primary circulating evaporator (1) flows into a non-condensable gas heat exchanger (15), and the distilled water generated by the primary circulating evaporator (1) flows into a distilled water tank (14);

the landfill leachate reaching the boiling point flows into a primary separation chamber (2), gas-liquid two-phase separation occurs in the primary separation chamber (2), and the separated secondary steam flows into a steam purification system for washing and purification;

the purified secondary steam flows into a first-stage steam compressor (3) to be heated and pressurized, part of the secondary steam flowing out of the first-stage steam compressor (3) returns to the shell side of the heating section of the first-stage circulating evaporator (1) to be used as an evaporation heat source for heat exchange and is condensed into distilled water, and the condensed distilled water flows into a distilled water tank (14);

one part of the liquid phase separated from the primary separation chamber (2) flows back into the primary circulation evaporator (1) through a primary circulation pump (9) for circulation, and the other part flows into the secondary circulation evaporator (5) through a secondary circulation pump (10);

the landfill leachate reaching the boiling point enters a secondary circulating evaporator (5) and exchanges heat with secondary steam in the shell pass of the heating section of the secondary circulating evaporator (5);

the other part of the secondary steam flowing out from the first-stage steam compressor (3) flows into the second-stage steam compressor (4) to be heated and boosted again, and one part of the secondary steam heated and boosted by the second-stage steam compressor (4) returns to the shell pass of the heating section of the second-stage circulating evaporator (5) to be used as an evaporation heat source for heat exchange and is condensed into distilled water;

the non-condensable gas generated by the secondary circulating evaporator (5) flows into a non-condensable gas heat exchanger (15), and the distilled water generated by the secondary circulating evaporator (5) flows into a distilled water tank (14);

the landfill leachate flowing out of the secondary circulating evaporator (5) flows into a secondary separation chamber (6), gas-liquid two-phase separation is carried out in the secondary separation chamber (6), and the separated secondary steam flows into a steam purification system for washing and purification;

one part of the liquid phase separated from the secondary separation chamber (6) flows back into the secondary circulation evaporator (5) through a secondary circulation pump (10) for circulation, and the other part flows into a dryer (8);

the other part of the secondary steam flowing out of the secondary steam compressor (4) flows into the tertiary steam compressor (7), is heated and pressurized again by the tertiary steam compressor (7) and then flows into the dryer (8), and the liquid phase flowing into the dryer (8) from the secondary separation chamber (6) is subjected to heat exchange drying;

the non-condensable gas generated by the dryer (8) flows into the non-condensable gas heat exchanger (15), and the distilled water generated by the dryer (8) flows into the distilled water tank (14), so that the whole treatment process is completed.