CN106746129B - Landfill leachate evaporation crystallization system - Google Patents
Landfill leachate evaporation crystallization system Download PDFInfo
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Abstract
The invention discloses a landfill leachate evaporative crystallization system, which comprises a coagulation turbidity removal subsystem, a heat recovery subsystem, an MVR evaporation subsystem and a tail gas deodorization subsystem; the coagulation turbidity removal subsystem is sequentially connected with the heat recovery subsystem and the MVR evaporation subsystem; a clear liquid return port of the heat recovery subsystem is connected to the coagulation turbidity removal subsystem; a concentrated solution return port of the MVR evaporation subsystem is connected to the heat recovery subsystem; the tail gas deodorization subsystem is connected with the heat recovery subsystem. The concentrated solution produced in the system is mixed with the stock solution before the reflux and then is circularly treated; the dosage of the agent of the coagulation turbidity removal subsystem is small, and the coagulation turbidity removal subsystem has obvious removal effect on turbidity and SS; the evaporator of the MVR evaporation subsystem adopts a sand-water circulation self-descaling system, and long-term stable operation of the evaporation subsystem is realized.
Description
Technical Field
The invention relates to the field of landfill leachate treatment, in particular to a landfill leachate stock solution evaporation and crystallization system.
Background
Pollution control of landfill leachate is always a troublesome problem in municipal waste management systems at home and abroad. The foreign research has been started earlier, and has been experienced for decades so far, and various treatment technologies and processes are developed. The research on the landfill leachate treatment technology in China is late, and most of the research is carried out according to foreign technologies, so that the search for a set of technology which is economical and reasonable and is suitable for landfill leachate treatment in China is an urgent problem for promoting the development of the landfill treatment technology.
The 'pollution control standard of domestic refuse landfill' (GB16889-2008) released and implemented in China in 2008 provides a higher standard for landfill leachate treatment, and increasingly serious environmental pollution problems also provide higher requirements for pollution emission reduction of various industries. The leachate has the characteristics of large water quality and water quantity fluctuation, high ammonia nitrogen content, unbalanced nutrient elements and the like, so that the treatment is difficult to reach the standard, and the operation cost is high. At present, domestic garbage disposal manufacturers mainly adopt a process of 'pretreatment + biochemistry + membrane', and the process comprises a plurality of treatment processes of flocculation, anaerobism, aerobism, ultrafiltration (MBR), NF/RO and the like, the system is complex, the affected factors are more, and because the membrane recovery rate is limited, concentrated solution with high pollution concentration of over 30 percent can be generated in the operation.
At present, the treatment method of the membrane concentrated solution mainly comprises a recharge circulation treatment and an evaporation treatment, if the recharge circulation treatment is adopted, salt is easy to accumulate due to the fact that salt cannot be discharged in time, the activity of microorganisms in the biochemical treatment process is influenced, the cleaning and replacing frequency of the membrane is increased, the operation cost is increased, and therefore the method is not a long-term effective solution. If evaporation treatment is adopted, an MVC + DI evaporation mode is adopted at present, and because landfill leachate contains high salt and high organic matters, six problems mainly exist in evaporation, namely a pretreatment system is not arranged before the landfill leachate enters an evaporation system, so that a preheater is seriously blocked; after entering the evaporator, along with the evaporation and concentration of the percolate, crystals such as salt, calcium, magnesium and the like in the percolate are separated out and adhered to the heat exchange tube, so that the evaporator is seriously scaled; the temperature difference change of the feeding temperature is large along with the change of weather, and the heat balance of the system fails after the feeding temperature enters the evaporation; the cold material entering system is started completely by an electric heating mode, so that the time is long; the concentrated solution and condensed water produced by the evaporation system cannot be effectively treated after being treated by DI, so that secondary pollution is caused. These problems seriously affect the long-term stable operation of the landfill leachate evaporation treatment system.
Disclosure of Invention
Based on the problems of the prior art, the invention aims to provide a landfill leachate evaporative crystallization system which has the advantages of small dosage of medicament, no generation of high-salinity concentrated solution and capacity of automatically cleaning scale of an evaporator.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a landfill leachate evaporative crystallization system, which comprises:
a coagulation turbidity removal subsystem, a heat recovery subsystem, an MVR evaporation subsystem and a tail gas deodorization subsystem; wherein the content of the first and second substances,
the coagulation turbidity removal subsystem is sequentially connected with the heat recovery subsystem and the MVR evaporation subsystem;
a clear liquid return port of the heat recovery subsystem is connected to the coagulation turbidity removal subsystem;
a concentrated solution return port of the MVR evaporation subsystem is connected to the heat recovery subsystem;
and the tail gas deodorization subsystem is connected with the MVR evaporation subsystem.
According to the technical scheme provided by the invention, the evaporative crystallization system for landfill leachate provided by the embodiment of the invention has the following beneficial effects:
(1) by arranging the coagulation turbidity removal subsystem, a small amount of medicament can be added, so that suspended solid particles and part of macromolecular organic matters in the leachate are effectively removed, and conditions are created for subsequent evaporation.
(2) The coagulation turbidity removal subsystem is arranged, so that macromolecular organic matters and inorganic salts with high boiling points in the concentrated solution produced by the system are in a micro-supersaturated state, the macromolecular organic matters and the inorganic salts are separated out in large quantity through the cooling crystallizer of the heat recovery subsystem, the solid and the liquid are separated through the second centrifugal machine, the produced clear solution flows into the coagulation turbidity removal subsystem again, the produced sludge is subjected to harmless treatment, and the concentrated solution with high salinity, high COD and difficult degradation is not produced.
(3) Through setting up MVR evaporation subsystem, the secondary steam that will evaporate the production condenses into the comdenstion water in the evaporimeter tubulation after compressing through vapor compressor, and this comdenstion water gets into biochemical workshop section after the heat is retrieved in the cooling, discharges after reaching standard.
(4) The MVR evaporation subsystem is internally provided with the electric steam boiler-condensed water tank integrated device, the electric steam boiler and the condensed water tank are combined into a whole, and steam generated by the electric steam boiler and circulating liquid in an evaporator are mixed and heated in the starting stage of the MVR evaporation subsystem, so that the efficiency is high, the equipment investment is saved, the energy consumption in the starting stage is effectively saved, and the starting time is shortened.
(5) The evaporator of the MVR evaporation subsystem adopts a sand-water circulation mechanism, has a self-descaling function and effectively prolongs the cleaning period.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of an evaporative crystallization system for landfill leachate according to an embodiment of the present invention;
the parts corresponding to the reference numerals in the figures are: 1-a coagulation turbidity removal subsystem; 11-liquid coming tank; 12-a first stirring device; 13-PAC solution supply means; 14-a second stirring device; 15-PAM supply solution; 16-a first centrifuge; 17-a sludge treatment device; 2-a heat recovery subsystem; 21-a buffer tank; 22-a feed pump; 23-cooling the crystallizer; 24-a discharge pump; 25-a second centrifuge; 26-a filter; 27-water preheater; 28-gas water preheater; 29-gas-liquid separator; 291-condensation water pool; 292-biochemical treatment device; 3-MVR evaporation subsystem; 31-a hot well; 32-an evaporator; 33-a circulating water pump; 34-a vapor compressor; 35-electric steam boiler-condensate tank integrated device; 36-condensate pump; 4-tail gas deodorization subsystem.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a landfill leachate evaporative crystallization system, which is a novel landfill leachate evaporative crystallization system with a self-cleaning evaporator, which has a small dosage of chemicals, does not produce a high-salinity concentrated solution, and includes:
a coagulation turbidity removal subsystem, a heat recovery subsystem, an MVR evaporation subsystem and a tail gas deodorization subsystem; wherein the content of the first and second substances,
the coagulation turbidity removal subsystem is sequentially connected with the heat recovery subsystem and the MVR evaporation subsystem;
a clear liquid return port of the heat recovery subsystem is connected to the coagulation turbidity removal subsystem;
a concentrated solution return port of the MVR evaporation subsystem is connected to the heat recovery subsystem;
the tail gas deodorization subsystem is connected with the heat recovery subsystem.
The coagulation turbidity removal subsystem in the system comprises: the system comprises a liquid inlet tank, a first stirring device, a PAC solution supply device, a second stirring device, a PAM supply solution, a first centrifuge and a sludge treatment device; wherein the content of the first and second substances,
the liquid inlet tank is respectively provided with a stock solution inlet, a clear solution inlet and a mixed solution outlet;
a mixed liquid outlet of the liquid inlet tank is sequentially connected with a first stirring device, a second stirring device and a first centrifugal machine;
the PAC solution supply device is connected to the first stirring device;
the PAM supply solution is connected to the second stirring device;
the first centrifugal machine is provided with a clear liquid outlet and a sludge outlet which are respectively connected with the heat recovery system, and the sludge outlet is connected with the sludge treatment device.
The coagulation turbidity removal subsystem is suitable for direct evaporation treatment of landfill leachate stock solution, the leachate stock solution is mixed with saturated liquid which flows automatically from a liquid tank, the mixed liquid sequentially passes through a first stirring device to be mixed with PAC solution supplied by a PAC solution supply device, a PAM solution supplied by a PAM solution supply device is mixed by a second stirring device, the mixed liquid enters a first centrifugal machine for centrifugal separation, the produced clear liquid enters a heat recovery subsystem, and the separated sludge enters a sludge treatment device.
The heat recovery subsystem in the above system comprises: the device comprises a buffer tank, a feeding pump, a cooling crystallizer, a discharging pump, a second centrifugal machine, a filter, a water-water preheater, a gas-liquid separator and a condensate water tank; wherein the content of the first and second substances,
the cooling crystallizer is provided with a clear liquid inlet, a crystal slurry outlet, a concentrated liquid inlet and a clear liquid outlet;
the buffer tank is connected with a clear liquid outlet of a first centrifugal machine of the coagulation turbidity removal subsystem, and is connected with a clear liquid inlet of the cooling crystallizer through a pipeline provided with a feed pump;
a crystal slurry outlet of the cooling crystallizer is connected with a second centrifugal machine through a pipeline provided with a discharge pump, and the second centrifugal machine is provided with a clear liquid reflux port connected to a clear liquid inlet of a liquid tank of the coagulation turbidity removal subsystem;
a concentrated solution inlet of the cooling crystallizer is connected with a concentrated solution reflux port of the MVR evaporation subsystem;
a clear liquid outlet of the cooling crystallizer is sequentially connected with a water preheater and a gas water preheater through a filter;
the water-water preheater is respectively provided with a condensed water inlet and a condensed water outlet;
the gas-water preheater is respectively provided with an uncondensed gas inlet, an uncondensed gas outlet and a clear liquid outlet;
a condensed water outlet of the water-water preheater and an uncondensed gas outlet of the gas-water preheater are respectively connected with the gas-liquid separator;
the water phase outlet of the gas-liquid separator is connected with the condensate water tank, and the gas phase outlet of the gas-liquid separator is connected with the tail gas deodorization subsystem;
and a condensed water inlet of the water-water preheater, an uncondensed gas inlet of the gas-water preheater and a clear liquid outlet of the gas-water preheater are respectively connected with the MVR evaporation subsystem.
The heat recovery subsystem further comprises: and the biochemical treatment device is connected with the water outlet of the condensate water tank.
In the heat recovery subsystem, two water preheaters can be arranged, one water preheater is used mainly, and the other water preheater is used for standby; two gas-water preheaters are also arranged, one gas-water preheater is used mainly, and the other gas-water preheater is used for standby.
The heat recovery subsystem cools the concentrated solution produced by the MVR evaporation subsystem through a cooling crystallizer and then enters a second centrifuge, the crystal floc produced by the second centrifuge is mixed with the sludge produced by the coagulation turbidity removal subsystem and then enters a sludge treatment system, and the saturated solution produced by the second centrifuge flows back to a liquid inlet tank of the coagulation turbidity removal subsystem; cooling the condensate by a water preheater, then feeding the condensate into a gas-liquid separator, cooling the non-condensable gas, then feeding the non-condensable gas to a biochemical treatment device, and discharging the non-condensable gas after reaching the standard; the noncondensable gas is cooled by a gas-water preheater, enters a gas-liquid separator for cooling again and enters a tail gas deodorization subsystem; because the turbidity of the clear liquid obtained after the landfill leachate stock solution is coagulated and turbidity is removed has the characteristic of rising again after heating, the clear liquid produced by the coagulation and turbidity removal subsystem is heated up by a cooling crystallizer, is separated by a filter into flocs, and then is heated up to a set temperature by a water preheater and a gas preheater in sequence and enters an MVR evaporation subsystem.
The MVR evaporation subsystem in the system comprises: the system comprises a hot well, an evaporator, a steam compressor, a circulating water pump, an electric steam boiler-condensed water tank integrated device; wherein the content of the first and second substances,
the hot well is connected with a clear liquid outlet of the gas-water preheater;
sand is arranged in the hot well, and the hot well is connected back to the evaporator through a circulating liquid pipeline provided with a circulating water pump to form a sand-water circulating mechanism;
the hot well is connected to the evaporator through a circulating liquid pipeline provided with a circulating water pump;
the bottom of the hot well is provided with a concentrated solution return port connected to a concentrated solution inlet of a cooling crystallizer of the heat recovery subsystem;
the evaporator is connected with the vapor compressor;
the evaporator is connected with an electric steam boiler-condensed water tank integrated device, the electric steam boiler-condensed water tank integrated device is respectively provided with a steam outlet and a condensed water outlet, the steam outlet is connected back to the evaporator, and the condensed water outlet is connected to a condensed water inlet of a water preheater of the heat recovery subsystem through a condensed water pump;
the evaporator is provided with an uncondensed gas outlet which is connected with an uncondensed gas inlet of a gas-water preheater of the heat recovery subsystem.
The electric steam boiler-condensed water tank integrated device of the MVR evaporation subsystem is an integrated device combining an electric steam boiler and a condensed water tank into a whole.
The evaporator of the MVR evaporation subsystem is a horizontal spraying falling-film evaporator, a spray head and a heat exchange pipe are arranged in the evaporator, and a wire mesh demister and a gas-liquid separation tank are arranged at a secondary steam outlet; the evaporation temperature of the evaporator is 85-105 ℃, and constant-temperature evaporation can be realized by controlling the pressure of the evaporator barrel; the spraying density of the circulating liquid of the evaporator is 0.08-0.15 kg/(m.s).
The MVR evaporation subsystem enables clear liquid produced by the coagulation turbidity removal subsystem heated to a specified temperature to alternately enter the upper part and the bottom part of the hot well, and the upper part of the MVR evaporation subsystem is mixed with circulating liquid and then sprayed to the outer surface of a heat exchanger tube nest; sand entering from the bottom of the hot well is suspended, and then mixed with circulating liquid and sprayed to the surface of the heat exchanger tube array, so that the sand is used for removing scaling substances on the surface of the heat pipe bundle in the falling process. The circulating liquid on the surface of the tube array exchanges heat with high-temperature steam from a steam compressor in the tube array, the secondary steam generated by evaporation enters the steam compressor for compression, the high-temperature steam in the tube array is cooled into condensed water, the condensed water enters an electric steam boiler and then enters a water preheater, and the produced concentrated liquid enters a cooling crystallizer from a hot well. Wherein electric steam boiler and condensate water pitcher unite two into one, and at the vaporization system start-up stage, the steam that generates directly gets into the evaporimeter, mixes the heating with the circulating liquid, has effectively shortened vaporization system start-up time, and because the heat balance that comes the liquid temperature very low, the evaporimeter scale deposit etc. causes became invalid in the vaporization stage moreover, electric steam boiler can play the effect that the system heat was rectified.
The tail gas deodorization subsystem in the system adopts a non-condensable gas absorption tower with alkaline liquid as absorption liquid, and the non-condensable gas is discharged into the atmosphere after the odor of the non-condensable gas is removed by the non-condensable gas absorption tower. The noncondensable gas absorption tower can adopt a filler type absorption tower, and can use alkali liquor with a certain concentration to absorb harmful acid gas in the odor.
In the system, the concentrated solution produced by the MVR evaporation subsystem is mixed with the landfill leachate stock solution before the coagulation sedimentation, and after the coagulation sedimentation, the mixed solution enters the heat recovery subsystem, and then enters the MVR evaporation subsystem after heat exchange with the hot concentrated solution, the condensed water and the non-condensable gas produced by the MVR evaporation subsystem in sequence, so that the energy recovery system of the whole system is ensured, and meanwhile, the system is ensured not to produce concentrated solution, so that the system can run reliably and energy-saving.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the landfill leachate evaporative crystallization system of the present embodiment includes a coagulation turbidity removal subsystem, a heat recovery subsystem, an evaporation subsystem, and a tail gas deodorization subsystem; wherein the content of the first and second substances,
the coagulation turbidity removal subsystem comprises: the leachate stock solution is mixed with saturated liquid flowing automatically in the liquid tank, and then is mixed with the PAC solution supplied by the PAC solution supply device through the first stirring device in sequence, the PAM solution supplied by the second stirring device and the PAM solution supplied by the PAM solution supply device is mixed and then enters the first centrifugal machine for centrifugal separation, the produced clear liquid enters the heat recovery subsystem, and the sludge enters the sludge treatment device.
The heat recovery subsystem includes: the system comprises a cooling crystallizer, a second centrifuge, a filter, a water-water preheater (one use and one standby), a gas-liquid separator and a gas-water preheater (one use and one standby), wherein concentrated liquid produced by the system enters the second centrifuge after being cooled by the cooling crystallizer, crystal floc produced by the second centrifuge is mixed and solidified with sludge produced by a coagulation turbidity removal subsystem and then enters a sludge treatment system, and saturated liquid produced by the second centrifuge flows back to a liquid inlet tank; cooling the condensate by a water preheater, then feeding the condensate into a gas-liquid separator, cooling the non-condensable gas, then sending the non-condensable gas to biochemical treatment, and discharging the non-condensable gas after reaching the standard; cooling the noncondensable gas by a gas-water preheater, then feeding the noncondensable gas into a gas-liquid separator for cooling again, and then feeding the noncondensable gas into a tail gas deodorization system; and the clear liquid produced by the coagulation and turbidity removal subsystem is heated up by a cooling crystallizer, is separated into flocs by a filter, is heated up to a set temperature by a water preheater and a gas water preheater in sequence, and then enters the MVR evaporation subsystem.
The MVR evaporation subsystem includes: the system comprises an evaporator, a hot well, a vapor compressor and an electric steam boiler-condensate water tank integrated device, wherein clear liquid produced by a coagulation and turbidity removal subsystem heated to a specified temperature alternately enters the upper part and the bottom part of the hot well, enters the upper part, is mixed with circulating liquid and then is sprayed to the outer surface of a heat exchanger tube in the evaporator; sand entering from the bottom of the hot well is suspended, and then mixed with circulating liquid and sprayed to the surface of the heat exchanger tube array, so that the sand is used for removing scaling substances on the surface of the heat pipe bundle in the falling process. The circulating liquid on the surface of the heat exchanger tube nest exchanges heat with high-temperature steam from a steam compressor in the tube nest, secondary steam generated by evaporation enters the steam compressor to be compressed, the high-temperature steam in the heat exchanger tube nest is cooled into condensed water, the condensed water enters an electric steam boiler-condensed water tank integrated device of an electric steam boiler and then enters a water preheater of a heat recovery subsystem, and the generated concentrated liquid enters a cooling crystallizer of the heat recovery subsystem from a hot well. In the electric steam boiler-condensed water tank integrated device, an electric steam boiler and a condensed water tank are combined into a whole, and generated steam directly enters an evaporator and is mixed with circulating liquid for heating in the starting stage of an MVR evaporation subsystem.
The tail gas deodorization subsystem adopts a non-condensable gas absorption tower, and the non-condensable gas is discharged into the atmosphere after the odor of the non-condensable gas is removed by the non-condensable gas absorption tower.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A landfill leachate evaporative crystallization system, characterized by, includes:
a coagulation turbidity removal subsystem, a heat recovery subsystem, an MVR evaporation subsystem and a tail gas deodorization subsystem; wherein the content of the first and second substances,
the coagulation turbidity removal subsystem is sequentially connected with the heat recovery subsystem and the MVR evaporation subsystem;
a clear liquid return port of the heat recovery subsystem is connected to the coagulation turbidity removal subsystem;
a concentrated solution return port of the MVR evaporation subsystem is connected to the heat recovery subsystem;
the tail gas deodorization subsystem is connected with the heat recovery subsystem;
the heat recovery subsystem includes: the device comprises a buffer tank, a feeding pump, a cooling crystallizer, a discharging pump, a second centrifugal machine, a filter, a water-water preheater, a gas-liquid separator and a condensate water tank; wherein the content of the first and second substances,
the cooling crystallizer is provided with a clear liquid inlet, a crystal slurry outlet, a concentrated liquid inlet and a clear liquid outlet;
the buffer tank is connected with a clear liquid outlet of a first centrifugal machine of the coagulation turbidity removal subsystem, and the buffer tank is connected with a clear liquid inlet of the cooling crystallizer through a pipeline provided with a feed pump;
the crystal slurry outlet of the cooling crystallizer is connected with the second centrifuge through a pipeline provided with a discharge pump, and the second centrifuge is provided with a clear liquid reflux port connected to a clear liquid inlet of a liquid tank of the coagulation turbidity removal subsystem;
a concentrated solution inlet of the cooling crystallizer is connected with a concentrated solution reflux port of the MVR evaporation subsystem;
the clear liquid outlet of the cooling crystallizer is sequentially connected with the water preheater and the gas-water preheater through a filter;
the water-water preheater is respectively provided with a condensed water inlet and a condensed water outlet;
the gas-water preheater is respectively provided with an uncondensed gas inlet, an uncondensed gas outlet and a clear liquid outlet;
a condensed water outlet of the water-water preheater and an uncondensed gas outlet of the gas-water preheater are respectively connected with a gas-liquid separator;
the water phase outlet of the gas-liquid separator is connected with the condensed water pool, and the gas phase outlet of the gas-liquid separator is connected with the tail gas deodorization subsystem;
the condensed water inlet of the water-water preheater, the non-condensed gas inlet of the gas-water preheater and the clear liquid outlet of the gas-water preheater are respectively connected with the MVR evaporation subsystem.
2. The evaporative crystallization system for landfill leachate according to claim 1, wherein the coagulation turbidity removal subsystem comprises:
the system comprises a liquid inlet tank, a first stirring device, a PAC solution supply device, a second stirring device, a PAM supply solution, a first centrifuge and a sludge treatment device; wherein the content of the first and second substances,
the liquid inlet tank is respectively provided with a stock solution inlet, a clear solution inlet and a mixed solution outlet;
the mixed liquid outlet of the liquid inlet tank is sequentially connected with the first stirring device, the second stirring device and the first centrifugal machine;
the PAC solution supply device is connected to the first stirring device;
the PAM supply solution is connected to the second stirring device;
the first centrifugal machine is provided with a clear liquid outlet and a sludge outlet which are respectively connected with the heat recovery system, and the sludge outlet is connected with the sludge treatment device.
3. The landfill leachate evaporative crystallization system of claim 1, wherein the heat recovery subsystem further comprises: and the biochemical treatment device is connected with the water outlet of the condensate water tank.
4. The landfill leachate evaporative crystallization system of claim 1 or 2, wherein the MVR evaporation subsystem comprises: the system comprises a hot well, an evaporator, a steam compressor, a circulating water pump, an electric steam boiler-condensed water tank integrated device; wherein the content of the first and second substances,
the hot well is connected with a clear liquid outlet of the gas-water preheater;
an evaporator is arranged at the upper end of the hot well and is communicated with the inside of the hot well;
sand is arranged in the hot well, and the hot well is connected back to the evaporator through a circulating liquid pipeline provided with a circulating water pump to form a sand-water circulating mechanism;
the bottom of the hot well is provided with a concentrated solution return port connected to a concentrated solution inlet of a cooling crystallizer of the heat recovery subsystem;
the evaporator is connected with the vapor compressor;
the evaporator is connected with the electric steam boiler-condensed water tank integrated device, the electric steam boiler-condensed water tank integrated device is respectively provided with a steam outlet and a condensed water outlet, the steam outlet is connected back to the evaporator, and the condensed water outlet is connected to a condensed water inlet of a water preheater of the heat recovery subsystem through a condensed water pump;
the evaporator is provided with an uncondensed gas outlet which is connected with an uncondensed gas inlet of a gas-water preheater of the heat recovery subsystem.
5. The evaporative crystallization system for landfill leachate according to claim 4, wherein the electric steam boiler-condensed water tank integrated device is an integrated device combining an electric steam boiler and a condensed water tank.
6. The landfill leachate evaporative crystallization system of claim 4, wherein the evaporator is a horizontal spray falling film evaporator, a spray head and a heat exchange pipe are arranged in the evaporator, and a wire mesh demister and a gas-liquid separation tank are arranged at a secondary steam outlet;
the evaporation temperature of the evaporator is 85-105 ℃;
the spraying density of the circulating liquid of the evaporator is 0.08-0.15 kg/(m.s).
7. The landfill leachate evaporative crystallization system of claim 1 or 2, wherein the tail gas deodorization subsystem employs a non-condensable gas absorption tower with an absorption liquid being an alkaline liquid.
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| CN110732224A (en) * | 2018-07-20 | 2020-01-31 | 中山市共创环保有限公司 | Tail gas treatment device of landfill leachate evaporation treatment system and treatment process thereof |
| CN108928983A (en) * | 2018-07-25 | 2018-12-04 | 山东鑫蓝新能源科技有限公司 | A kind of sewage low temperature distillation processing system |
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| CN101182049B (en) * | 2007-11-23 | 2011-03-16 | 陈伟雄 | Evaporation system for treating refuse leachate |
| CN103387306A (en) * | 2013-07-30 | 2013-11-13 | 大连广泰源环保科技有限公司 | Garbage leachate processing system and processing technology thereof |
| CN204588908U (en) * | 2015-04-30 | 2015-08-26 | 中山中珠环保科技有限公司 | A kind of New-type refuse vehicle percolation liquid treating system |
| CN105031965A (en) * | 2015-07-22 | 2015-11-11 | 深圳市捷晶能源科技有限公司 | Zero-emission evaporation and crystallization device |
| CN205099536U (en) * | 2015-10-28 | 2016-03-23 | 江苏维尔利环保科技股份有限公司 | Treatment facility of landfill leachate reverse osmosis concentrate |
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