CN102303942B - Blue alga cake tubular pyrohydrolysis dewatering method and device - Google Patents
Blue alga cake tubular pyrohydrolysis dewatering method and device Download PDFInfo
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Abstract
The invention provides a blue alga cake tubular pyrohydrolysis dewatering method and a blue alga cake tubular pyrohydrolysis dewatering device. The device provided by the invention consists of a feeding system, a modifying system, a dewatering system, a heat exchange system and a purifying system. The method comprises: filling the pretreated blue alga cake raw material with a water content of about 80 percent by using raw material tank, heating the raw material by low-pressure steam directly, performing pyrohydrolysis under a medium-temperature condition, fully recovering and using residual energy in a hydrolysis process, adding treated clay, increasing the specific gravity of the mixture and obtaining a liquid-solid mixture; making the water content in the treated material obtained after liquid-solid separation adjustable, and reducing the water content to 40 to 60 percent from the 80 percent in the originally treated blue alga cake. Compared with the prior art, the device has the advantages that: the structure is simple, the operation is continuous and smooth; the hydrolysis temperature of algae is 110 to 150 DEG C; the reaction time is 10 to 20 minutes; the alga treatment is economic; reduction and innocent treatment can be realized quickly and effectively; and large-scale treatment can be carried out easily. Therefore, the invention provides a new approach for the treatment, disposal and recycling of blue algae and the recovery of energy from the equipment.
Description
Technical field
The present invention relates to a kind of bloom blue algae Waste Disposal Technology field, be specifically related to a kind of lake bloom blue algae minimizing dewatering, relate in particular to a kind of blue-green algae tube type water heating solution dehydration method and device, belong to the agriculture environmental protection field.
Background technology
Along with the mankind increase day by day to the exploitation activity of environmental resources, the high concentration of industrial expansion and urban population, the trade effluent and the sanitary sewage that contain in a large number pollution substance just enter water body without suitable processing, make the rising of the aerobic substance concentration such as ammonia nitrogen in water body, phosphorus and organic pollutant, increased the lifting capacity of the nutritive substance in water; And in order to improve the output of farm crop, using chemical fertilizer increases year by year,, through rainwash and infiltration, has more nutritive substance to run off and enters in water, has also increased the lifting capacity of the nutritive substance in water; Aspect aquaculture, for reaching the fishery high yield, the method for throwing in bait is adopted in some areas, and this also becomes water body and admits the main channel of the nutritive substances such as nitrogen, phosphorus.
Eutrophic water body outburst algae forms wawter bloom, is a global problem.In China, because the surge production of rapid economic development and population and the pollutent of life enter water body in a large number, inland rivers, water body in lake and offshore waters are subject to serious pollution, blue-green alga bloom, green alga wawter bloom, and the red algae wawter bloom takes place frequently.The blue-green algae material that increases rapidly, cause toxic substance, sordes matter processed and the organism of the release of mortality algae to local water quality and Air quality severe exacerbation, and jeopardize fishery and drinking water safety, how to handle these blue-green algaes well and make it minimizing and innoxious, become problem demanding prompt solution in environmental pollution treatment.
Through research for many years, the lake wawter blooms such as China Dian Chi, Taihu Lake, Chaohu are mainly blue-green alga blooms, take little, assist algae as main, and what this class algae was diameter at the 5-10 micron is unicellular, and on this type organic content 85%, nutrient content is very abundant.
municipal administration is at present processed the disposal blue-green algae and is mainly taked to salvage and press dewatering, the subject matter that exists has: salvaging is the important measures of eliminating the Inland Water water bloom pollution, in the Yunnan Province of China Dian Chi, Taihu Lake, Jiangsu, Chaohu, Anhui Province, Chinas etc. are used, but due to the water content of fresh and alive Cells of Blue-green Algae own in 90% left and right, the Cells of Blue-green Algae of salvaging out also exists a large amount of parlor gravity water and planar water, no matter the manual method of taking or mechanical means are salvaged, the water ratio of bloom blue algae is generally all at 95%-99%, too high water ratio, not only to the blue-green algae transportation, bring very large cost, bring great difficulty also for the blue-green algae ultimate disposal.
Plant factor is lower; Blue-green algae does not carry out the processing of minimizing, innoxious and stabilization; Volume is larger, and trucking costs is high, distributes stench and pathogenic agent in transportation, and affecting environmental health etc. is that present blue-green algae is processed existing common problem.Up to the present, also do not have the low mature technology of economical and effective, energy consumption carry out minimizing and harmless treatment and take full advantage of existing blue-green algae.
Given this, need to provide a kind of method that fundamentally solves the blue-green algae problem, must adopt stabilization process, blue alga cake is carried out minimizing cost-effectively, harmless treatment.
In existing blue alga cake dehydration Reduction Technology, the treatment process of proposition has following several:
1, Liu Xiufen, Chen Hui, Chen Jian, Deng (China Patent Publication No. CN:101330156A), a kind of method that realizes blue algae resource is disclosed, adopt blue algae water in tank in appositional pattern microbiological fuel cell reactor, remove blue-green algae or pollution substance by the degraded of the electrogenesis bacterium in blue-green algae, thereby realize the minimizing of blue-green algae, innoxious and resource utilization.
2, in being in harmony, Ni Jie, Wu Peisong, wait (China Patent Publication No. CN:101249995A) to disclose the tripping device of a kind of blue-green algae and water, by the flocculation producer is set in liquid-storing box, the blue algae water in liquid-storing box is separated effectively.
3, Huang Hongying, Chang Zhizhou, Ye Xiaomei, a kind of method of water bloom blue algae dewatering is disclosed Deng (China Patent Publication No. CN:101139123A), by add flocculation agent and auxiliary agent thereof in blue-green algae filtrate, after centrifuge dehydration, be conducive to water in born of the same parents and discharge, greatly improved dehydrating effect.
4, Hu Mingming, Sunyang, Sun Xiaopeng, a kind of technique of processing blue algae slurry with intracapsular dehydration technique is disclosed Deng (China Patent Publication No. CN:101219850123A), pass through high speed shear, homogeneous is broken, additional flocculating agents, separate by whizzer, reached blue-green algae slag and moisture from purpose, improve the feasibility of blue-green algae comprehensive utilization.
5, Ding Zujun, Zhou Haiping, Hu Suming, wait (China Patent Publication No. CN:101139124A) to disclose a kind of blue algae volume reduction technique, by add flocculation agent in blue algae slurry, stirs, and reached the purpose that reduces water ratio in blue-green algae.
But aforesaid method is all that unilaterally to collect, reduce the blue-green algae water ratio be purpose, and technological process needs more treatment process, and equipment requirements is harsh, and the large-scale production difficulty is large, and technique can not get effective assurance, and it is high that blue-green algae is disposed Financial cost.
As seen, blue-green algae is disposed and recycles need to solve two key issues: one, fast reducing and control pathogenic bacteria, microorganism and parasitic ovum in blue-green algae water ratio and killing blue algae, to realize innoxious and resource utilization; Two, reduce energy consumption and the Cost Problems that blue-green algae is disposed.
Summary of the invention
Technical problem to be solved by this invention is, the defect and the deficiency that exist in order to overcome prior art provide a kind of a kind of tube type water heating solution treatment process of quick, innoxious, economic reduction blue alga cake water ratio, the problem that exists to solve prior art.That this treatment process has advantages of is energy-efficient, processing cost is low, be fit to mass-producing processes, and to control the blue-green algae water ratio be 60% left and right.
The device that provides above-mentioned blue alga cake tubular thermal hydrolysis treatment process to use is provided another technical problem to be solved by this invention.
As a kind of blue alga cake tubular thermal hydrolysis treatment process of a first aspect of the present invention, this treatment process is carried out in one comprises the tubular type blue-green algae disposing device of feed system, heat-exchange system, reforming system, dewatering system and purification system; After described blue-green algae is sent into the heat-exchange system preheating by feed system, sending into reforming system filling clay carries out modification and obtains liquid-solid mixture again, described liquid-solid mixture is sent in heat-exchange system again, the blue-green algae of being come by feed system with preheating, liquid-solid mixture after heat exchange is sent into the dewatering system dehydration, and the algal biscuit moisture control that obtains is below 60%.
In treatment process of the present invention, the injection flow of described clay is that 50 orders or 100 purpose farmland arid soil settling velocity are controlled by clay.
Device as the processing of a kind of blue-green algae tube type water heating of a second aspect of the present invention solution, it is characterized in that, comprise feed system, heat-exchange system, reforming system, dewatering system and purification system, wherein heat-exchange system comprises the first preheater, the second preheater, non-condensable gas interchanger, flash steam interchanger; Reforming system comprises the first mixing tank, the second mixing tank, reactor, flasher, and the outlet of described feed system is connected with the blue-green algae entrance of the first preheater; The moisture blue-green algae outlet of the first preheater is connected with the moisture blue-green algae entrance of the second preheater, the liquid-solid mixture outlet of the second preheater connects the liquid-solid mixture inlet in dewatering system, the moisture blue-green algae outlet of the second preheater is connected with the moisture blue-green algae entrance of non-condensable gas interchanger, the liquid exit of non-condensable gas interchanger connects the first liquid entrance of the first preheater, the pneumatic outlet of non-condensable gas interchanger connects purification system, and the moisture blue-green algae outlet of non-condensable gas interchanger connects the moisture blue-green algae entrance of flash steam interchanger; The liquid exit of flash steam interchanger connects the second liquid entrance of the first preheater, the pneumatic outlet of flash steam interchanger connects purification system, the moisture blue-green algae outlet of flash steam interchanger connects the moisture blue-green algae entrance of the first mixing tank, the steam-in of the first mixing tank connects middle pressure steam, the moisture blue-green algae outlet of the first mixing tank connects the moisture blue-green algae entrance of the second mixing tank, the clay filler of the second mixing tank adds note hopper by clay and connects the clay tank, and the moisture blue-green algae outlet of the second mixing tank connects the moisture blue-green algae entrance of reactor; The liquid-solid mixture outlet of flasher connects the liquid-solid mixture inlet of the second preheater, and the vapour outlet of flasher connects the steam-in of flash steam interchanger.
Described dewatering system comprises decantor and whizzer, and the liquid-solid mixture inlet of decantor connects the liquid-solid mixture outlet of the second preheater, and the liquid-solid mixture outlet of decantor connects the liquid-solid mixture inlet of whizzer.
Described reactor adopts tubular reactor.
Beneficial effect of the present invention:
The device that the present invention uses finally makes blue-green algae reducing quantize and is innoxious, and the carrier of controlled composition is provided for possible green fertilizer.Therefore, the blue-green algae water ratio after liquid-solid separation will have adjustability; Compared with prior art, this device adopts the consumption of controlling clay, accelerates the solid-liquid settling velocity, blue-green algae thermal hydrolysis temperature 110-150 ℃, and reaction times 10-20min, and reduce the blue algae dewatering time.
The reactor of this device can adopt tubular reactor, also can adopt traditional tank reactor, carry out the blue-green algae processing owing to adopting method of the present invention, speed is fast, flow is large, can adopt tubular reactor, with respect to tank reactor, tubular reactor is saved space more, and a kind of blue-green algae tube type water heating solution treatment process also is provided simultaneously.
The present invention is energy-efficient, the reduction processing cost, and after treatment, the blue-green algae moisture control is in 60% left and right.
This apparatus structure is simple, can continuous and stable operation, can make blue-green algae reach fast minimizing, innoxious, be easy to carry out mass-producing and process, and sought a cost-effective novel approach for the energy recovery utilization of the processing of blue-green algae, disposal and equipment.
Description of drawings
Fig. 1 is the process flow sheet of the device of blue-green algae tube type water heating solution processing of the present invention.
In figure:
Feed system 100: storage tank 110, blue-green algae transferpump 120;
heat-exchange system 200: preheater 210, blue alga cake entrance 211, moisture blue-green algae outlet 212, liquid inlet 213, liquid inlet 214, fresh feed pump 220, preheater 230, moisture blue-green algae entrance 231, moisture blue-green algae outlet 232, liquid-solid mixture outlet 233, liquid-solid mixture inlet 234, non-condensable gas interchanger 240, moisture blue-green algae entrance 241, moisture blue-green algae outlet 242, liquid exit 243, pneumatic outlet 244, liquid 245, gas inlet 246, flash steam interchanger 250, moisture blue-green algae entrance 251, moisture blue-green algae outlet 252, liquid exit 253, pneumatic outlet 254, liquid 255, the steam-in 256 of vapor heat exchanger,
Reforming system 300: mixing tank 310, moisture blue-green algae entrance 311, moisture blue-green algae outlet 312, steam-in 313, mixing tank 320, moisture blue-green algae entrance 321, moisture blue-green algae outlet 322, clay filler 323, reactor 330, moisture blue-green algae entrance 331, liquid-solid mixture outlet 332, non-condensable gas 333, non-condensable gas outlet 334, flasher 340, liquid-solid mixture inlet 341, liquid-solid mixture outlet 343, vapour outlet 344, flash steam 346, clay 350, clay add tank 360, clay transferpump 370; Low-pressure steam 380,
Dewatering system 400: decantor 410, liquid-solid mixture inlet 411, liquid-solid mixture outlet 412, decantation clear liquid 413, whizzer 420, liquid-solid mixture inlet 421, isolate centrifugal clear liquid 423
600: the first moisture blue-green algaes 610 of blue-green algae, the second moisture blue-green algae 620, the 3rd moisture blue-green algae 630, the 4th moisture blue-green algae 640, the 5th moisture blue-green algae 650, blue-green algae argillaceous 660, the first liquid-solid mixture 670, the second liquid-solid mixture 680;
Blue alga cake 700.
Embodiment
In order to make technique means of the present invention, creation characteristic, reach purpose and effect is easy to understand, the present invention is further elaborated below in conjunction with embodiment.
The device that a kind of blue-green algae tube type water heating solution is processed, as shown in Figure 1, comprise feed system 100, heat-exchange system 200, reforming system 300, dewatering system 400 and purification system 500.
Heat-exchange system 200 comprises preheater 210, fresh feed pump 220, preheater 230, non-condensable gas interchanger 240 and flash steam interchanger 250.
The outlet of feed system 100 is connected with the blue-green algae entrance 211 of preheater 210; The moisture blue-green algae outlet 212 of this preheater 210 is connected with the moisture blue-green algae entrance 231 of preheater 230, the liquid-solid mixture outlet 233 of this preheater 230 connects the liquid-solid mixture inlet 411 of the decantor 410 in dewatering system, the moisture blue-green algae outlet 232 of preheater 230 is connected with the moisture blue-green algae entrance 241 of non-condensable gas interchanger 240, the liquid exit 243 of non-condensable gas interchanger 240 connects the liquid inlet 213 of preheater 210, and the pneumatic outlet 244 of non-condensable gas interchanger connects purification system.
The moisture blue-green algae outlet 242 of non-condensable gas interchanger 240 connects the moisture blue-green algae entrance 251 of flash steam interchanger 250, the liquid exit 253 of this flash steam interchanger 250 connects the liquid inlet 214 of preheater 210, and the pneumatic outlet 254 of flash steam interchanger 250 connects purification system; The moisture blue-green algae outlet 252 of flash steam interchanger 250 connects the moisture blue-green algae entrance 311 of mixing tank 310, the steam-in of mixing tank 310 connects middle pressure steam 380, the moisture blue-green algae outlet 312 of mixing tank 310 connects the moisture blue-green algae entrance 321 of mixing tank 320, the clay filler 323 of mixing tank 320 connects clay tank 360 by clay transferpump 370, and the moisture blue-green algae outlet 322 of mixing tank 320 connects the moisture blue-green algae entrance 331 of reactor 330; The non-condensable gas outlet 334 of reactor 330 connects the gas inlet 246 of non-condensable gas interchanger, and the liquid-solid mixture outlet 332 of reactor 330 connects the liquid-solid mixture inlet 341 of flasher 340; The liquid-solid mixture outlet 343 of flasher 340 connects the liquid-solid mixture inlet 234 of preheater 230, and the vapour outlet 344 of flasher 340 connects the steam-in 256 of flash steam interchanger 250.
The liquid-solid mixture inlet 411 of decantor 410 connects the liquid-solid mixture outlet 233 of preheater 230, and the liquid-solid mixture outlet 412 of decantor 410 connects the liquid-solid mixture inlet 421 of whizzer 420.
Embodiment 1
A kind of blue-green algae tube type water heating solution treatment process, comprise the following steps, as shown in Figure 1:
(1), preheating pressure testing step:
Carry out tubular type blue alga cake treatment unit with steam and carry out the preheating pressure testing, wherein pressure testing standard: the pressure of reforming system is 0.1-0.8Mpa, dewatering system, heat-exchange system, feed system, purification system four systems pressure are 0.1-0.3Mpa, and whole preheating pressure testing process stops when tubular type blue-green algae disposing device temperature reaches 120-150 ℃;
(2), the first pre-heating step:
With feedstock pump 120 blue-green algae 600 from storage tank 110 is continuously sent preheater 210 heat-exchange system 100 to, bring with the non-condensable gas interchanger 240 in heat-exchange system 200 liquid 255 that liquid 245 and flash steam interchanger 250 bring and mix, formation temperature is that 30-50 ℃ of the first moisture blue-green algae 610 sent by the moisture blue-green algae outlet 212 (namely the first preheater exports) of preheater 210.
(3) second pre-heating steps:
When preheater 210 has 1/3 level gage height, start fresh feed pump 220.In start-up, the flow of fresh feed pump changes from small to big, until prescribed value 2-12m
3/ h.Sent in preheater 230 in heat-exchange system 200 through fresh feed pumps 220 by the first moisture blue-green algae 610 after preheater 210 preheatings, the liquid-solid mixture 680 of with the flasher 340 in reforming system 300, coming carries out heat exchange, formation temperature is that 60-80 ℃ of the second moisture blue-green algae 620 sent by the moisture blue-green algae outlet 232 (i.e. second preheater the first outlet) of preheater 230 after heat exchange, and formation temperature is that 70-90 ℃ of liquid-solid mixture sent by the liquid-solid mixture outlet 233 (i.e. second preheater the second outlet) of preheater 230 after heat exchange.When starting fresh feed pump 220, control the injection rate of clay 350.
(4) the 3rd pre-heating steps:
Send into non-condensable gas interchanger 240 in heat-exchange system 200 by the second moisture blue-green algae 620 after preheater 230 preheatings, carry out heat exchange with reactor 330 non-condensable gas 333 out in reforming system 300, formation temperature is 75-95 ℃ of the 3rd moisture blue-green algae 630 after heat exchange; The 3rd moisture blue-green algae 630 is sent by the moisture blue-green algae outlet 242 (being the first outlet of non-condensable gas interchanger) of non-condensable gas interchanger; And after heat exchange formation temperature to be 80-100 ℃ of gas deliver to purification system 500 by the pneumatic outlet 244 (being the second outlet of non-condensable gas interchanger) of non-condensable gas interchanger 240 purifies.
(5) the 4th pre-heating steps:
Send into flash steam interchanger 250 in heat-exchange system 200 by the 3rd moisture blue-green algae 630 after 240 heat exchange of non-condensable gas interchanger, the flash steam 346 of with the flasher 340 in reforming system 300, coming carries out heat exchange, and formation temperature is 90-110 ℃ of the 4th moisture blue-green algae 640 after heat exchange; The 4th moisture blue-green algae 640 is sent by the moisture blue-green algae outlet 252 (being the first outlet of flash steam interchanger) of flash steam interchanger 250; And after heat exchange formation temperature to be 80-100 ℃ of gas deliver to purification system 500 by the pneumatic outlet 254 (being the second outlet of flash steam interchanger) of flash steam interchanger 250 purifies.
(6) first mixing steps:
By moisture blue-green algae outlet 252 mixing tanks 310 sent into reforming system 300 of the 4th moisture blue-green algae 640 after 250 heat exchange of flash steam interchanger from flash steam interchanger 250, moisture blue-green algae entrance 311 by mixing tank 310 enters in mixing tank 310, be that 3.5-3.8MPa middle pressure steam 380 mixes with passing into pressure, the formation temperature out is that the 5th moisture blue-green algae 650 of moisture blue-green algae 650, the five of 210-250 ℃ enters into the moisture blue-green algae entrance 321 of mixing tank 230 by the moisture blue-green algae outlet 312 of mixing tank 310.
Regulate the steam-in 313 that middle pressure steam 380 enters mixing tank 310, control moisture blue-green algae outlet 312 temperature outs of mixing tank 310 in 250 ℃ of scopes, the reaction times is 20min.
(7) second mixing steps:
The moisture blue-green algae 650 of mixing tank 310 the mixed the 5th is sent into the second mixing tank 320 in reforming system 300, mix with the clay 350 of filling, the clay filler 323 of mixing tank 320 connects clay tank 360 by clay pump 370, clay pump 370 is controlled the injection rate of clay 350, and controls the rate of addition of clay 350.Usually clay is 50 orders, 100 purpose farmland arid soils, according to 3.5 ‰ consumption of solid content in the 5th moisture blue-green algae 650, is pumped in mixing tank 320, press pH 5-7 control, forms blue-green algae 660 argillaceous.
(8) reactions steps:
The blue-green algae argillaceous 660 of mixing tank 320 formation is sent into reactor 330 react, in reaction process, the cellularstructure in blue-green algae is broken, discharges intracellular organic matter, generates small molecules carbide and nitride, and Maillard reaction occurs; Blue-green algae intermediate gap water, surface water, in conjunction with water, overflow between the blue-green algae particle, produce the first liquid-solid mixture 670 and non-condensable gas 333 and send; Reaction times 10min-20min wherein, temperature of reaction is controlled at 220-235 ℃.
The reactor 330 of this device can adopt tubular reactor, and the specification of tubular reactor is 159 * 6000/4 of Φ.
(8) flash distillation step:
, at the driving initial period, when flash steam interchanger 340 there is no thermal source, can substitute flash steam 346 with the low-pressure steam of 0.3Mpa.
The first liquid-solid mixture 670 of reactor 330 generations is sent into flasher 340 carry out flash distillation, the second liquid-solid mixture 680 and the flash steam 346 that form after flash distillation are sent.
After flasher 340 chargings: one will control flasher pressure in the 0.1-0.8Mpa scope, and two will observe and regulate the liquid level of flasher 340, have not both exceeded opening for feed, also not low to can't see liquid level.Flasher 340 is connected with flash steam interchanger 250, and flasher 340 is provided for secondary steam---the flasher 346 of heat exchange for flash steam interchanger 250.Flash steam 346 is during as the thermal source of flash steam interchanger, and low-pressure steam is closed.
(9) dehydrating step:
Formation temperature is that 70-90 ℃ of liquid-solid mixture delivered to dewatering system 400 by the liquid-solid mixture outlet 233 (namely the second preheater second exports) of preheater 230 and dewatered after the second preheater hot exchange.Dewatering system 400 comprises decantor 410 and whizzer 420.
The liquid-solid mixture outlet 233 of preheater 230 (i.e. second preheater the second outlet) is connected with the liquid-solid mixture inlet 411 of decantor, the liquid-solid mixture that enters decantor 410 is the sedimentation certain hour therein, and decantor clear liquid 413 constantly overflows (decantor 410 is isolated decantation clear liquid 413);
Concentrated solution is by the liquid-solid mixture inlet 421 of the liquid-solid mixture outlet 412 process whizzers of decantor 410; The whizzer 420 that constantly enters speed control by frequency variation carries out the liquid-solid separation of material, centrifugal through the 2000-5000rpm speed control by frequency variation, isolate centrifugal clear liquid 423, being precipitated as water ratio is the algal biscuit 700 of 40-60%, for follow-up recycling ready, as the carrier as composite fertilizer.
(8), the non-condensable gas 333 at reactor 330 tops is as the thermal source of non-condensable gas interchanger 240, the pneumatic outlet 244 by the non-condensable gas interchanger after heat exchange enters purification system 500.
(9), two kinds of clear liquids producing of this device: decantation clear liquid 413 and centrifugal clear liquid 423, by analysis after, enter the respective handling unit of blue-green algae supernatant liquor, supernatant liquor can be used as the substratum of green vegetables.
Embodiment 2
Referring to Fig. 1, a kind of blue-green algae tube type water heating solution treatment process comprises the following steps again:
(1), preheating pressure testing step:
Carry out tubular type blue alga cake treatment unit with steam and carry out the preheating pressure testing, wherein pressure testing standard: the pressure of reforming system is 0.1-0.8Mpa, dewatering system, heat-exchange system, feed system, purification system four systems pressure are 0.1-0.3Mpa, and whole preheating pressure testing process stops when tubular type blue-green algae disposing device temperature reaches 120-150 ℃;
(2), the first pre-heating step:
With feedstock pump 120 blue-green algae 600 from storage tank 110 is continuously sent preheater 210 heat-exchange system 100 to, bring with the non-condensable gas interchanger 240 in heat-exchange system 200 second liquid 255 that first liquid 245 and flash steam interchanger 250 bring and mix, formation temperature is that 30-50 ℃ of the first moisture blue-green algae 610 sent by the moisture blue-green algae outlet 212 (namely the first preheater exports) of preheater 210.
(3) second pre-heating steps:
When preheater 210 has 1/3 level gage height, start fresh feed pump 220.In start-up, the flow of fresh feed pump changes from small to big, until prescribed value 2-12m
3/ h.Sent in preheater 230 in heat-exchange system 200 through fresh feed pumps 220 by the first moisture blue-green algae 610 after preheater 210 preheatings, the second liquid-solid mixture 680 of with the flasher 340 in reforming system 300, coming carries out heat exchange, formation temperature is that 65-80 ℃ of the second moisture blue-green algae 620 sent by the moisture blue-green algae outlet 232 (i.e. second preheater the first outlet) of preheater 230 after heat exchange, and formation temperature is that 75-85 ℃ of liquid-solid mixture sent by the liquid-solid mixture outlet 233 (i.e. second preheater the second outlet) of preheater 230 after heat exchange.When starting fresh feed pump 220, control the injection rate of clay 350.
(4) the 3rd pre-heating steps:
Send into non-condensable gas interchanger 240 in heat-exchange system 200 by the second moisture blue-green algae 620 after preheater 230 preheatings, carry out heat exchange with reactor 330 non-condensable gas 333 out in reforming system 300, formation temperature is 85-95 ℃ of the 3rd moisture blue-green algae 630 after heat exchange; The 3rd moisture blue-green algae 630 is sent by the moisture blue-green algae outlet 242 (being the first outlet of non-condensable gas interchanger) of non-condensable gas interchanger; And after heat exchange formation temperature to be 85-100 ℃ of gas deliver to purification system 500 by the pneumatic outlet 244 (being the second outlet of non-condensable gas interchanger) of non-condensable gas interchanger purifies.
(5) the 4th pre-heating steps:
Send into flash steam interchanger 250 in heat-exchange system 200 by the 3rd moisture blue-green algae 630 after 240 heat exchange of non-condensable gas interchanger, the flash steam 346 of with the flasher 340 in reforming system 300, coming carries out heat exchange, and formation temperature is 90-110 ℃ of the 4th moisture blue-green algae 640 after heat exchange; The 4th moisture blue-green algae 640 is sent by the moisture blue-green algae outlet 252 (being the first outlet of flash steam interchanger) of flash steam interchanger; And after heat exchange formation temperature to be 85-100 ℃ of gas deliver to purification system 500 by the pneumatic outlet 254 (being the second outlet of flash steam interchanger) of flash steam interchanger purifies.
(6) first mixing steps:
By moisture blue-green algae outlet 252 mixing tanks 310 sent into reforming system 300 of the 4th moisture blue-green algae 640 after 250 heat exchange of flash steam interchanger from the flash steam interchanger, moisture blue-green algae entrance 311 by mixing tank 310 enters in mixing tank 310, be that 3.6-3.8MPa middle pressure steam 380 mixes with passing into pressure, the formation temperature out is that the 5th moisture blue-green algae 650 of moisture blue-green algae 650, the five of 210-250 ℃ enters into the moisture blue-green algae entrance 321 of mixing tank 320 by the moisture blue-green algae outlet 312 of mixing tank 310.
Regulate the steam-in 313 that middle pressure steam 380 enters mixing tank 310, control moisture blue-green algae outlet 312 temperature outs of mixing tank 310 in 250 ℃ of scopes, the reaction times is 20min.
(7) second mixing steps:
The moisture blue-green algae 650 of mixing tank 310 the mixed the 5th is sent into mixing tank 320 in reforming system 300, mix with the clay 350 of filling, the clay filler 323 of mixing tank 320 connects clay tank 360 by clay pump 370, clay pump 370 is controlled the injection rate of clay 350, and controls the rate of addition of clay 350.Usually clay is 50 orders, 100 purpose farmland arid soils, according to 3.5 ‰ consumption of solid content in the 5th moisture blue-green algae 650, is pumped in mixing tank 320, press pH 5-7 control, forms blue-green algae 660 argillaceous.
(8) reactions steps:
The blue-green algae argillaceous 660 of mixing tank 320 formation is sent into reactor 330 react, in reaction process, the cellularstructure in blue-green algae is broken, discharges intracellular organic matter, generates small molecules carbide and nitride, and Maillard reaction occurs; Blue-green algae intermediate gap water, surface water, in conjunction with water, overflow between the blue-green algae particle, produce the first liquid-solid mixture 670 and non-condensable gas 333 and send; Reaction times 10min-20min wherein, temperature of reaction is controlled at 225-235 ℃, and reaction pressure is controlled at 2.8-3.0MPa.
(8) flash distillation step:
, at the driving initial period, when flash steam interchanger 340 there is no thermal source, can substitute flash steam 346 with the low-pressure steam of 0.6Mpa.
The first liquid-solid mixture 670 of reactor 330 generations is sent into flasher 340 carry out flash distillation, the second liquid-solid mixture 680 and the flash steam 346 that form after flash distillation are sent.
After flasher 340 chargings: one will control flasher pressure in the 0.2-0.6Mpa scope, and two will observe and regulate the liquid level of flasher, have not both exceeded opening for feed, also not low to can't see liquid level.Flasher 340 is connected with flash steam interchanger 250, and flasher 340 is provided for secondary steam---the flasher 346 of heat exchange for flash steam interchanger 250.Flash steam 346 is during as the thermal source of flash steam interchanger, and low-pressure steam is closed.
(9) dehydrating step:
To be 70-85 ℃ of liquid-solid mixture deliver to dewatering system 400 by the liquid-solid mixture outlet 233 (i.e. second preheater the second outlet) of preheater 230 to formation temperature dewaters after preheater 230 heat exchanges.Dewatering system 400 comprises decantor 410 and whizzer 420.
The liquid-solid mixture outlet 233 of preheater 230 (i.e. second preheater the second outlet) is connected with the liquid-solid mixture inlet 411 of decantor, the liquid-solid mixture that enters decantor 410 is the sedimentation certain hour therein, and decantor clear liquid 413 constantly overflows (decantor 410 is isolated decantation clear liquid 413);
Concentrated solution is by the liquid-solid mixture inlet 421 of the liquid-solid mixture outlet 412 process whizzers of decantor 410; The whizzer 420 that constantly enters speed control by frequency variation carries out the liquid-solid separation of material, centrifugal through the 2500-5000rpm speed control by frequency variation, isolate centrifugal clear liquid 423, being precipitated as water ratio is the algal biscuit 700 of 40-60%, for follow-up recycling ready, as the carrier as composite fertilizer.
(8), the non-condensable gas 333 at reactor 330 tops is as the thermal source of non-condensable gas interchanger 240, the pneumatic outlet 244 by the non-condensable gas interchanger after heat exchange enters purification system 500.
(9), two kinds of clear liquids producing of this device: decantation clear liquid 413 and centrifugal clear liquid 423, by analysis after, enter the respective handling unit of blue-green algae supernatant liquor, supernatant liquor can be used as the substratum of green vegetables.
The reactor 330 of embodiment 1 can adopt tubular reactor, and the specification of tubular reactor is 159 * 6000/4 of Φ.Embodiment 2 adopts traditional tank reactor, and the specification of tank reactor is DN1600, VN5m
3Owing to adopting method of the present invention to carry out the blue-green algae processing, speed is fast, and flow is large, can adopt tubular reactor, and with respect to tank reactor, tubular reactor is saved space more.
Above demonstration and described basic skills of the present invention and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and specification sheets just illustrates principle of the present invention and method; under the prerequisite that does not break away from purport of the present invention and scope; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.
Claims (3)
1. blue alga cake tubular thermal hydrolysis treatment process, this treatment process is carried out in one comprises the tubular type blue-green algae disposing device of feed system, heat-exchange system, reforming system, dewatering system and purification system, after blue alga cake is sent into the heat-exchange system preheating by feed system, carry out modification, the non-condensable gas that forms in modifying process and secondary steam and liquid-solid mixture are sent into heat-exchange system as thermal source, the blue-green algae of being come by feed system with preheating; After adding clay, send into the dewatering system dehydration through the liquid-solid mixture after heat exchange, the algal biscuit moisture control is 60%;
Specifically comprise the steps:
(1), preheating pressure testing step:
Carry out tubular type blue alga cake treatment unit with steam and carry out the preheating pressure testing, wherein pressure testing standard: the pressure of reforming system is 0.1-0.8Mpa, dewatering system, heat-exchange system, feed system, purification system four systems pressure are 0.1-0.3Mpa, and whole preheating pressure testing process stops when tubular type blue-green algae disposing device temperature reaches 120-150 ℃;
(2), the first pre-heating step:
With feedstock pump blue-green algae from storage tank is continuously sent the first preheater heat-exchange system to, bring with the non-condensable gas interchanger in heat-exchange system the second liquid that first liquid and flash steam interchanger bring and mix, formation temperature is that 30-50 ℃ of the first moisture blue-green algae sent by the first preheater outlet;
(3) second pre-heating steps:
When the first preheater has 1/3 level gage height, start fresh feed pump, in start-up, the flow of fresh feed pump changes from small to big, until prescribed value 2-12m
3/ h, sent in the second preheater in heat-exchange system by the first moisture blue-green algae after the first preheater preheating, the second liquid-solid mixture of with the flasher in reforming system, coming carries out heat exchange, formation temperature is that 60-80 ℃ of the second moisture blue-green algae sent by second preheater the first outlet after heat exchange, and formation temperature is that 70-90 ℃ of liquid-solid mixture sent by second preheater the second outlet after heat exchange; When starting fresh feed pump, control the injection rate of clay;
(4) the 3rd pre-heating steps:
Send into non-condensable gas interchanger in heat-exchange system by the second moisture blue-green algae after the second preheater preheating, carry out heat exchange with the reactor non-condensable gas out in reforming system, formation temperature is that 75-95 ℃ of the 3rd moisture blue-green algae sent by the first outlet of non-condensable gas interchanger after heat exchange; And after heat exchange formation temperature to be 80-100 ℃ of gas deliver to purification system by the second outlet of non-condensable gas interchanger purifies;
(5) the 4th pre-heating steps:
Send into flash steam interchanger in heat-exchange system by the 3rd moisture blue-green algae after the heat exchange of non-condensable gas interchanger, the flash steam of with the flasher in reforming system, coming carries out heat exchange, and formation temperature is that 90-110 ℃ of the 4th moisture blue-green algae sent by the first outlet of flash steam interchanger after heat exchange; And after heat exchange formation temperature to be 80-100 ℃ of gas deliver to purification system by the second outlet of flash steam interchanger purifies;
(6) first mixing steps:
Export from the moisture blue-green algae of flash steam interchanger the first mixing tank of sending into reforming system by the 4th moisture blue-green algae after the heat exchange of flash steam interchanger, be that the 3.5-3.8MPa middle pressure steam mixes with passing into pressure, the formation temperature out is the 5th moisture blue-green algae of 210-250 ℃;
(7) second mixing steps:
The first mixing tank the mixed the 5th moisture blue-green algae is sent into the second mixing tank in reforming system, with the clay of filling, mix, the clay pump is controlled the injection rate of clay, and controls the rate of addition of clay, forms blue algae slurry argillaceous and sends; The filling rate of its medium clay soil is the 3.5wt ‰ of solid content in the 5th moisture blue alga cake, presses the pH value and controls for 5-7; Described clay is 50 orders, 100 purpose farmland arid soils;
(8) reactions steps:
The blue alga cake argillaceous of the second mixing tank formation is sent into reactor react, in reaction process, the cytocyst structure in blue-green algae is broken, discharges water and free water in born of the same parents, produces the first liquid-solid mixture and non-condensable gas and sends; Reaction times 10min-20min wherein, temperature of reaction is controlled at 220-235 ℃; Described reactor is tubular reactor;
(9) flash distillation step:
The first liquid-solid mixture of reactor generation is sent into flasher carry out flash distillation, the second liquid-solid mixture and the flash steam that form after flash distillation are sent; After the flasher charging: one will control the pressure of flasher in the 0.1-0.8MPa scope, the 2nd, the liquid level of observing and regulating flasher, both do not exceeded opening for feed, not low to can't see liquid level yet, flasher is connected with the interchanger of flasher, flasher is secondary steam-flash steam that the flasher interchanger is provided for heat exchange, and flash steam is during as the thermal source of described flasher interchanger, and low-pressure steam is closed;
(10) dehydrating step:
To be 70-90 ℃ of liquid-solid mixture deliver to by second preheater the second outlet that dewatering system dewaters to water ratio to formation temperature is 60% blue-green algae throw out after the second preheater hot exchange.
2. device of realizing the described blue alga cake tubular thermal hydrolysis of claim 1 treatment process, it is characterized in that, comprise feed system, heat-exchange system, reforming system, dewatering system and purification system, wherein heat-exchange system comprises the first preheater, the second preheater, non-condensable gas interchanger, flash steam interchanger, reforming system comprises the first mixing tank, the second mixing tank, reactor, flasher, and the outlet of described feed system is connected with the blue-green algae entrance of the first preheater; The moisture blue-green algae outlet of the first preheater is connected with the moisture blue-green algae entrance of the second preheater, the liquid-solid mixture outlet of the second preheater connects the liquid-solid mixture inlet in dewatering system, the moisture blue-green algae outlet of the second preheater is connected with the moisture blue-green algae entrance of non-condensable gas interchanger, the liquid exit of non-condensable gas interchanger connects the first liquid entrance of the first preheater, the pneumatic outlet of non-condensable gas interchanger connects purification system, and the moisture blue-green algae outlet of non-condensable gas interchanger connects the moisture blue-green algae entrance of flash steam interchanger; The liquid exit of flash steam interchanger connects the second liquid entrance of the first preheater, the pneumatic outlet of flash steam interchanger connects purification system, the moisture blue-green algae outlet of flash steam interchanger connects the moisture blue-green algae entrance of the first mixing tank, the steam-in of the first mixing tank connects low-pressure steam, the moisture blue-green algae outlet of the first mixing tank connects the moisture blue-green algae entrance of the second mixing tank, the clay filler of the second mixing tank connects clay by dispenser pump and drips tank, and the moisture blue-green algae outlet of the second mixing tank connects the moisture blue-green algae entrance of reactor; The non-condensable gas outlet of reactor connects the gas inlet of non-condensable gas interchanger, and the liquid-solid mixture outlet of reactor connects the liquid-solid mixture inlet of connecing of flasher; The liquid-solid mixture outlet of flasher connects the liquid-solid mixture inlet of the second preheater, and the vapour outlet of flasher connects the steam-in of flash steam interchanger.
3. device as claimed in claim 2, it is characterized in that, described dewatering system comprises decantor and whizzer, and the liquid-solid mixture inlet of decantor connects the liquid-solid mixture outlet of the second preheater, and the liquid-solid mixture outlet of decantor connects the liquid-solid mixture inlet of whizzer.
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| CN112174467A (en) * | 2020-09-04 | 2021-01-05 | 无锡国联环保科技股份有限公司 | Blue algae mud recycling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1762847A (en) * | 2004-10-19 | 2006-04-26 | 殷肇君 | Method for cleaning out blue algae of water area |
| CN101139124A (en) * | 2007-08-14 | 2008-03-12 | 江苏鼎泽环境工程有限公司 | Blue algae volume reduction technique |
| CN101318714A (en) * | 2008-07-23 | 2008-12-10 | 中国科学院水生生物研究所 | A method and device for harvesting water bloom cyanobacteria |
| CN101979349A (en) * | 2010-08-06 | 2011-02-23 | 安徽合协生态环境科技有限公司 | Tubular pyrohydrolysis treatment method and device for sludge |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1762847A (en) * | 2004-10-19 | 2006-04-26 | 殷肇君 | Method for cleaning out blue algae of water area |
| CN101139124A (en) * | 2007-08-14 | 2008-03-12 | 江苏鼎泽环境工程有限公司 | Blue algae volume reduction technique |
| CN101318714A (en) * | 2008-07-23 | 2008-12-10 | 中国科学院水生生物研究所 | A method and device for harvesting water bloom cyanobacteria |
| CN101979349A (en) * | 2010-08-06 | 2011-02-23 | 安徽合协生态环境科技有限公司 | Tubular pyrohydrolysis treatment method and device for sludge |
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