CN109139158A - Utilize the system and method for biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater - Google Patents
Utilize the system and method for biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater Download PDFInfo
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- CN109139158A CN109139158A CN201810884955.6A CN201810884955A CN109139158A CN 109139158 A CN109139158 A CN 109139158A CN 201810884955 A CN201810884955 A CN 201810884955A CN 109139158 A CN109139158 A CN 109139158A
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- desulfurization wastewater
- flue gas
- heat
- biogas
- flue
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 119
- 230000003009 desulfurizing Effects 0.000 title claims abstract description 119
- 239000002351 wastewater Substances 0.000 title claims abstract description 116
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nODVweCcgaGVpZ2h0PSc4NXB4JyB2aWV3Qm94PScwIDAgODUgODUnPgo8IS0tIEVORCBPRiBIRUFERVIgLS0+CjxyZWN0IHN0eWxlPSdvcGFjaXR5OjEuMDtmaWxsOiNGRkZGRkY7c3Ryb2tlOm5vbmUnIHdpZHRoPSc4NS4wJyBoZWlnaHQ9Jzg1LjAnIHg9JzAuMCcgeT0nMC4wJz4gPC9yZWN0Pgo8dGV4dCB4PSczNS4wJyB5PSc1My42JyBjbGFzcz0nYXRvbS0wJyBzdHlsZT0nZm9udC1zaXplOjIzcHg7Zm9udC1zdHlsZTpub3JtYWw7Zm9udC13ZWlnaHQ6bm9ybWFsO2ZpbGwtb3BhY2l0eToxO3N0cm9rZTpub25lO2ZvbnQtZmFtaWx5OnNhbnMtc2VyaWY7dGV4dC1hbmNob3I6c3RhcnQ7ZmlsbDojM0I0MTQzJyA+QzwvdGV4dD4KPHRleHQgeD0nNTEuMCcgeT0nNTMuNicgY2xhc3M9J2F0b20tMCcgc3R5bGU9J2ZvbnQtc2l6ZToyM3B4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO3RleHQtYW5jaG9yOnN0YXJ0O2ZpbGw6IzNCNDE0MycgPkg8L3RleHQ+Cjx0ZXh0IHg9JzY3LjAnIHk9JzYyLjknIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6MTVweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiMzQjQxNDMnID40PC90ZXh0Pgo8L3N2Zz4K C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 230000001603 reducing Effects 0.000 title claims abstract description 42
- 239000000779 smoke Substances 0.000 title claims abstract description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000003546 flue gas Substances 0.000 claims abstract description 124
- 239000002028 Biomass Substances 0.000 claims abstract description 65
- 238000001694 spray drying Methods 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group 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- 238000002425 crystallisation Methods 0.000 claims abstract description 22
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- 150000003839 salts Chemical class 0.000 claims abstract description 17
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- 238000009833 condensation Methods 0.000 claims abstract description 16
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
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- FKNQFGJONOIPTF-UHFFFAOYSA-N sodium cation Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound 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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
Abstract
The invention discloses a kind of system and method using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater.Wherein, which includes: heat exchange of heat pipe, and evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；Heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Biomass medium temperature combustion gas after cooling down enters coal unit combustion power generation；Flue gas recycled after heating mixes after entering spray drying tower with the desulfurization wastewater sprayed in spray drying tower, enters dedusting in deduster after converging later into the flue gas that the flue of deduster entrance and coal unit air preheater export；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting.The present invention removes the harmful substance in desulfurization wastewater using the sensible heat of discarded biogas, energy-saving and environment-friendly, and the purity is high of byproduct salt crystallization, added value are high.
Description
Technical field
The invention belongs to coal-fired coupled biological matter power fields more particularly to a kind of utilization biogas sensible heat and flue gas to steam
The system and method for sending out emission reduction desulfurization wastewater.
Background technique
Coal-fired coupled biological matter coupled electricity-generation technology can crack stalk field and directly burn equal governance problem, can overcome biology
The matter energy resourceization disadvantage higher using pollutant emission level can promote the low-carbon cleaning hair of power industry especially coal electricity
Exhibition.Wherein, gasification of biomass coupling is important coupled electricity-generation approach.
Biomass Gasification in Circulating Fluidized Bed is anti-by biomass oxidizing fire, reduction and thermal decomposition etc. in gasification furnace
It answers, burns including part material and the oxygen in air, energy required for reduction and pyrolysis is provided, it is most of former
Material is thermally decomposed under high temperature state, and generating temperature is more than 700 DEG C of combustion gas.If it exceeds 700 DEG C of combustion gas directly transport
If burning into the coal-burning boiler being coupled, since the specific volume of high-temperature fuel gas under same pressure is larger, with low temperature combustion gas phase
Than needing more heavy in section gas pipeline to go to convey, moreover, the thermal expansion and thermal walking of high-temperature fuel gas pipeline are all than low temperature combustion gas
Pipeline is big, and stress state is more severe than low temperature gas pipeline, more dangerous；On the other hand, the combustion gas more than 700 DEG C directly transports
It is unfavorable to the cooling protection of burner into burner, it be easy to cause the scaling loss of burner.Therefore, usually gasification is generated
High-temperature fuel gas, which cools down to be transported in coal-burning boiler again, to burn.
Biogas is exactly containing a large amount of tar there are also another characteristic.Tar is heavy in cooling procedure for high-temperature fuel gas
Product is easy to cause heat exchange cooling failure.Moreover, once because tar deposition leads to exchange heat cooling failure it is necessary to gasification furnace and combustion gas
Heat-condutive oil heat exchanger is overhauled in conveyance conduit blowing out later, and this also becomes the master that restriction biomass gas fires generation technology development again
Want one of factor.
Prior art CN203741285U discloses a kind of biomass thermal combustion gas cooling system, first with the cooling high temperature of conduction oil
Combustion gas, then cooling conduction oil is removed with condensed water.However, there are risk of leakage for conduction oil, once leakage, which is easy kindling, causes fire,
And heat-condutive oil heat exchanger is the heat exchanger of tandem type, even if a root canal is damaged, it is also desirable to gasification furnace and fuel gas transportation pipeline
Heat-condutive oil heat exchanger is overhauled in blowing out later, because blowing out economic loss caused by heat-condutive oil heat exchanger failure is huge.
Desulfurization wastewater is usually the discharge water generated in absorption tower, specific in boiler smoke process of wet desulphurization
In operation process, in order to keep serum recycle system substance in desulfurizer to stablize in some equilibrium state, in order to avoid in flue gas
Soluble substance is more than the requirement of related specifications, and guarantees gypsum quality, and then the water in system is discharged a part, becomes useless
Water, that is to say, that the collective effect of gypsum dehydration and cleaning system etc. produces desulfurization wastewater.Contain a large amount of sulphur in waste water
Hydrochlorate and heavy metal etc., and there is quite a few to provide to want that the substance of emission control must be carried out for national environmental protection, therefore want
Certain processing is carried out to desulfurization wastewater, the final purpose for realizing zero-emission.Desulfurization wastewater zero-emission is multinomial comprehensive water-using, section
The use of water technology, is finally just able to achieve.Every water-saving technology individually talks a certain Xiang Jie through during production technology
Water technology is zero-emission difficult to realize.
From the point of view of the actual conditions of Desulphurization for Coal-fired Power Plant wastewater treatment, mostly with coagulating sedimentation and total value and processing mode pair
Desulfurization wastewater is handled, but it is merely capable of removing the related substances in discharge standard, and calcium ion and sodium ion etc. still stay
It is stored in waste water, actual treatment complex procedures, and treatment effect is not very ideal.Conventional waste water Zero discharge treatment method is
Conventional multiple-effect evaporation crystallization processes.Vapo(u)rization system is divided into 4 units: heat input unit, heat recovery units, crystalline element, attached
Belong to system unit.Heat input unit accesses steam from main plant area, becomes low-pressure steam after pressure and temperature reducing, then steam is sent
Waste water is heated to heating room.Condensate liquid after heat exchange then enters in condensation water tank.Desulfurization after conventional treatment
Waste water draining is sent to salt slurry case after the heating of multistage evaporation room concentration, cyclone is delivered to by brine pump, by the salt of bulky grain
Crystallization carries out eddy flow and enters centrifuge, isolates salt crystal, is then sent to all kinds of drying beds dryings through screw conveyor again
Tower is dried.The slurries that cyclone and centrifuge are isolated are back in heating system is evaporated concentration again, final dry
Salt crystallization packed and transported factory out.But the high energy consumption of the treatment process limits its pushing away in desulfurization wastewater zero-emission field
Extensively
There are also a kind of technologies promoted, i.e. flue evaporation at present.Flue evaporation is divided into low after air preheater again
The high-temperature flue gas evaporation of warm smoke evaporative and air preheater bypass.Prior art CN107129094A discloses a kind of using air preheater
Preceding high-temperature flue gas, the system that crystallization is evaporated to desulfurization wastewater by the evaporating column being independently arranged.However, air preheater is general
Height more than 20 meters of height, if drawing high-temperature flue gas before air preheater to zero meter, it is longer that it will cause flue lengths, elbow
It is more, due to having not gone through deduster before air preheater, therefore it is easy to cause dust stratification in elbow；If in order to reduce flue length
And high-temperature flue gas is drawn before air preheater to the independent evaporating column built on boiler steel frame, it will cause newly-increased to boiler steel frame
Biggish load, for improvement project, increase on original boiler steel frame larger load be usually need by
Consolidation process, and consolidation process generally requires and increases biggish expense.
In conclusion existing fire coal coupled biological matter electricity generation system and desulfurization wastewater emission-reducing system have the following deficiencies:
(1) harmful substance is more in desulfurization wastewater, and current desulfurization wastewater emission-reducing process energy consumption is big, and byproduct salt crystallizes
Purity it is low.
(2) the heat utilization medium of existing coal-fired coupled biological matter electricity generation system is condensed water, and the heat of biogas
Have the characteristics that unstable, the heat of biogas is utilized using the method for heat-setting water, to the heating power system of coal unit
The stability influence for parameter of uniting is larger, increases complexity to operation.
(3) heat-condutive oil heat exchanger caused by due to being precipitated etc. tar is damaged and then leads to entire coal-fired coupled biological matter
Electricity generation system paralysis, the repair time is long and overhauls high labor cost.
Summary of the invention
In order to solve the deficiencies in the prior art, the first object of the present invention is to provide a kind of utilization biogas sensible heat and cigarette
The system that gas evaporates emission reduction desulfurization wastewater can make full use of the aobvious of biogas in coal-fired coupled biological matter electricity generation system
Heat, and it is used to remove the harmful substance in coal unit desulfurization wastewater, it is energy-saving and environment-friendly, and the purity of byproduct salt crystallization
High, added value height.
A kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the invention, comprising: heat pipe changes
Hot device, the heat exchange of heat pipe include evaporator section and condensation segment, wherein and evaporator section is connected with biomass high-temperature gas pipeline,
Heat for organism-absorbing matter high-temperature fuel gas；Condensation segment is connected with flue gas recycled pipeline, for putting to flue gas recycled
Heat；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting.
Further, the deduster is connected by air-introduced machine with desulfurization island, and the flue gas recycled pipeline is from air-introduced machine
Flue afterwards is drawn, and flue gas recycled pipeline is connected to heat exchange of heat pipe by gas recirculating fan.
Further, the deduster is connected by air-introduced machine with desulfurization island, and the flue gas recycled pipeline is from deduster
It is drawn on flue afterwards and before air-introduced machine, and flue gas recycled pipeline is connected to heat exchange of heat pipe by gas recirculating fan.
Further, the heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
Its effect generated are as follows:
When a wherein heat pipe is blocked up or when a variety of causes failure is damaged by tar deposition, the normal of other heat pipes is not influenced
Work.
Further, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature gas pipeline
Top.
Its effect generated are as follows:
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and again by biomass high-temperature gas heating in evaporator section, repeatedly.
Further, the system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes that desulfurization is useless
Water storage tank is used to keep in the desulfurization wastewater of coal unit generation, when biomass gasifying furnace is gone into operation, then by desulfurization wastewater storage tank
In desulfurization wastewater spray into spray drying tower in.
Further, the system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes air preheater
Spray drying tower is drawn from the flue before coal unit air preheater and accessed to bypass flue, in the spray drying tower, from sky
After mixing with desulfurization wastewater evaporation and crystal process occurs for the bypass flue gas that pre- device bypass flue comes；When biomass gasifying furnace is normally transported
When row, the air door on air preheater bypass flue is closed, and air preheater bypass flue is not run.
Further, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater sprays into spraying by spray head
Drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.
Further, spray drying tower bottom is equipped with ash bucket and storehouse pumps, and the particle that desulfurization wastewater evaporative crystallization generates is received
Collect ash bucket, is pumped and be discharged by storehouse after the particle accumulation to preset height in ash bucket.
The second object of the present invention is to provide a kind of is using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater
The working method of system can remove the harmful substance in desulfurization wastewater, energy-saving and environment-friendly, and the crystallization of byproduct salt is pure
Degree is high, added value is high.
A kind of working method of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the invention, packet
It includes:
Flue gas recycled is heated up biomass high-temperature combustion gas cooling down by heat exchange of heat pipe；
Biomass medium temperature combustion gas after cooling down enters coal unit combustion power generation；
Flue gas recycled after heating mixes after entering spray drying tower with the desulfurization wastewater sprayed in spray drying tower, real
Now to the evaporative crystallization of desulfurization wastewater, the salt crystalline particle of precipitation largely passes through the ash that natural subsidence enters spray drying tower
Bucket；
The flue gas that the flue gas come out from spray drying tower enters the flue of deduster entrance and coal unit air preheater exports
Enter dedusting in deduster after converging；Flue gas after dedusting is connected to air-introduced machine.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention removes the harmful substance in desulfurization wastewater using the sensible heat of discarded biogas, it is not only energy saving but also
Environmental protection, and what the present invention utilized is from the hot cigarette that the flue gas of house outlet is recycled and is thermally formed by biogas
Gas, compared with the hot fume before conventionally employed deduster entrance, the original dustiness of flue gas is low, so that the crystallization of byproduct salt is pure
Degree is high, added value is high.
(2) system overhaul of the invention using biogas sensible heat is easy to maintain: when tar deposition or a variety of causes are led
When the single heat pipe damage caused, remaining heat pipe remains to work normally.Compared with conventional thermal conductive oil heat exchanger, heat exchange of heat pipe it is each
Root heat pipe can relatively independent work, have the advantages that it is insensitive to tar deposition, and conventional thermal conductive oil heat exchanger cleaning deposition
Tar when, need to every root canal road power shovel tar removing, and heat exchange of heat pipe only need to quickly extract the heat pipe of damage out, then change
Repair time and maintenance cost of labor is greatly saved in upper new heat pipe.
(3) present invention is compared in the prior art using the sensible heat of biogas come heat-setting water, due to heat-setting
Water is affected to the therrmodynamic system of coal unit, and the yield and source due to biomass have seasonal, gasification furnace event
Factors, the times of putting into operation of biomass gasifying furnace such as barrier rate is higher are unstable, that is to say, that can using the sensible heat of biogas come plus
The operating condition that heat setting is born water is not the operating condition of normality, and the heat of biogas have the characteristics that it is unstable, using heat-setting
The method of water utilizes the heat of biogas, larger to the stability influence of the therrmodynamic system parameter of coal unit, to operation
Increase complexity.When optimizing therrmodynamic system, if design point selection is not utilize the sensible heat of biogas solidifying to heat
It bears water, then when the sensible heat using biogas is come heat-setting water, energy consumption and available energy loss are not achieved minimum；And if set
Enumeration selection is using the sensible heat of biogas come heat-setting water, then not utilizing the sensible heat of biogas solidifying to heat
When bearing water, energy consumption and available energy loss are not achieved minimum.And the present invention on therrmodynamic system without influence, therrmodynamic system can by energy consumption and
Available energy loss is minimum to be designed；On the other hand, no matter whether the source of biomass stable, whether gas processed is stable, can realize
Emission reduction or even zero-emission to desulfurization wastewater.After all the reason of, is that the heating of condensed water is closely joined with electrical energy production
The process of system is continuous process, and is to allow interrupted process, for example can use storage to the evaporative crystallization of desulfurization wastewater
It is interrupted on the mode deadline of desulfurization wastewater.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is that system example one structure of the invention using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater is shown
It is intended to；
Fig. 2 is that system example two structure of the invention using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater is shown
It is intended to；
Fig. 3 is that system example three structure of the invention using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater is shown
It is intended to；
Fig. 4 is that system example four structure of the invention using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater is shown
It is intended to；
Fig. 5 is that system example five structure of the invention using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater is shown
It is intended to.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Example one
As shown in Figure 1, a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment,
It include: heat exchange of heat pipe, evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting.
In the present embodiment, heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
It is blocked up or when a variety of causes failure is damaged by tar deposition when a wherein heat pipe in this way, do not influence other heat pipes
It works normally.
In specific implementation, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature combustion gas
The top of pipeline.
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and in evaporator section again by biomass high-temperature gas heating, repeatedly.
In the present embodiment, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater is sprayed by spray head
Spray drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.In the present embodiment, the flue gas after air-introduced machine is
The driving force of positive pressure flue gas, flue gas recycled comes from air-introduced machine.
In the present embodiment, spray drying tower bottom is equipped with ash bucket and storehouse pumps, the particle that desulfurization wastewater evaporative crystallization generates
It is collected into ash bucket, is pumped and is discharged by storehouse after the particle accumulation to preset height in ash bucket.
The working principle of the system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment are as follows:
Recycling cold flue gas is connected to heated become of heat exchange of heat pipe and recycles hot fume, and recycling hot fume enters spraying dry
Dry tower realizes that the evaporative crystallization to desulfurization wastewater, the salt crystalline particle of precipitation largely pass through natural subsidence and enter spray drying tower
Ash bucket, a small amount of salt crystalline particle be mixed in recycling flue gas in leaves spray drying tower.It is discharged from spray drying tower
Flue gas is known as recycling flue gas.Recycling flue gas is connected to the flue and coal unit sky of deduster entrance from spray drying tower
The flue gas of pre- device outlet enters dedusting in deduster after converging.Flue gas by deduster dedusting is connected to air-introduced machine.
The recycling cold flue gas of the present embodiment is all the recycling heat extracted out after deduster, therefore enter spray drying tower
The coal-fired dust that flue gas contains is considerably less, so with higher pure by the salt crystalline particle of the storehouse pump discharge of spray drying tower
Degree, can be collected sale, market value with higher can create higher Poly-generation economic benefit.
Embodiment two
As shown in Fig. 2, a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment,
It include: heat exchange of heat pipe, evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline
It is logical；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting；
The deduster is connected by air-introduced machine with desulfurization island, and the flue gas recycled pipeline draws from the flue after air-introduced machine
Out, and flue gas recycled pipeline by gas recirculating fan is connected to heat exchange of heat pipe.
Flue gas after the present embodiment air-introduced machine is still positive pressure flue gas, but by setting gas recirculating fan, can be further
The pressure head for guaranteeing flue gas recycled, can overcome bigger flow resistance.
In the present embodiment, heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
It is blocked up or when a variety of causes failure is damaged by tar deposition when a wherein heat pipe in this way, do not influence other heat pipes
It works normally.
In specific implementation, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature combustion gas
The top of pipeline.
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and in evaporator section again by biomass high-temperature gas heating, repeatedly.
In the present embodiment, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater is sprayed by spray head
Spray drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.
In the present embodiment, spray drying tower bottom is equipped with ash bucket and storehouse pumps, the particle that desulfurization wastewater evaporative crystallization generates
It is collected into ash bucket, is pumped and is discharged by storehouse after the particle accumulation to preset height in ash bucket.
Embodiment three
As shown in figure 3, a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment,
It include: heat exchange of heat pipe, evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting；
The deduster is connected by air-introduced machine with desulfurization island, and in the present embodiment, the flue gas recycled pipeline is from dedusting
It is drawn on flue after device and before air-introduced machine, and flue gas recycled pipeline is connected to heat exchange of heat pipe by gas recirculating fan.
In the present embodiment, since the flue gas after deduster, before air-introduced machine is negative pressure flue gas, so needing through setting flue gas
Recirculation blower promotes the pressure head of flue gas recycled, by flue gas recycled boosting at positive pressure flue gas, to overcome the flowing resistance along journey
Power.
In the present embodiment, heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
It is blocked up or when a variety of causes failure is damaged by tar deposition when a wherein heat pipe in this way, do not influence other heat pipes
It works normally.
In specific implementation, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature combustion gas
The top of pipeline.
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and in evaporator section again by biomass high-temperature gas heating, repeatedly.
In the present embodiment, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater is sprayed by spray head
Spray drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.
In the present embodiment, spray drying tower bottom is equipped with ash bucket and storehouse pumps, the particle that desulfurization wastewater evaporative crystallization generates
It is collected into ash bucket, is pumped and is discharged by storehouse after the particle accumulation to preset height in ash bucket.
Example IV
As shown in figure 4, a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment,
It include: heat exchange of heat pipe, evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting；
The system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes desulfurization wastewater storage tank,
For keeping in the desulfurization wastewater of coal unit generation.
When biomass gasifying furnace is stopped transport for some reason and idle time is shorter, since biogas stops production, therefore coal unit is produced
Raw desulfurization wastewater is temporarily stored in desulfurization wastewater storage tank, when biomass gasifying furnace is gone into operation, then will be in desulfurization wastewater storage tank
Desulfurization wastewater spray into spray drying tower in.To realize Biogas technique, desulfurization wastewater technique of zero discharge and hair
Electrician's process system be coupled in it is temporal discontinuously so that the stoppage in transit of Biogas technology process is to desulfurization wastewater technique of zero discharge
Influence be reduced to it is minimum.
In the present embodiment, heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
It is blocked up or when a variety of causes failure is damaged by tar deposition when a wherein heat pipe in this way, do not influence other heat pipes
It works normally.
In specific implementation, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature combustion gas
The top of pipeline.
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and in evaporator section again by biomass high-temperature gas heating, repeatedly.
In the present embodiment, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater is sprayed by spray head
Spray drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.
In the present embodiment, spray drying tower bottom is equipped with ash bucket and storehouse pumps, the particle that desulfurization wastewater evaporative crystallization generates
It is collected into ash bucket, is pumped and is discharged by storehouse after the particle accumulation to preset height in ash bucket.
In the present embodiment, recycle cold flue gas entrance can be deduster after, the flue before air-introduced machine, be also possible to
Flue after air-introduced machine.When the flue extraction recycling cold flue gas after deduster, before air-introduced machine, on flue gas recirculation pipeline
It needs that gas recirculating fan is arranged；When recycling cold flue gas from the flue extraction after air-introduced machine, on flue gas recirculation pipeline
Gas recirculating fan can be set, gas recirculating fan can also be not provided with.
Embodiment five
As shown in figure 5, a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the present embodiment,
It include: heat exchange of heat pipe, evaporator section is connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；Cool down cold
But the biomass medium temperature combustion gas after enters coal unit combustion power generation；Flue gas recycled after heating enter after spray drying tower with
The desulfurization wastewater mixing sprayed in spray drying tower, later into the flue of deduster entrance and the outlet of coal unit air preheater
Flue gas enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting；
The system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes air preheater bypass flue,
It draws from the flue before coal unit air preheater and accesses spray drying tower, bypasses flue gas air preheater bypass flue and desulfurization
Evaporation and crystal process occurs after waste water mixing；When biomass gasifying furnace operates normally, the air door on air preheater bypass flue is closed
It closes, air preheater bypass flue is not run.
The embodiment is suitable for when biomass gasifying furnace is stopped transport for some reason and idle time is longer.
In the present embodiment, heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
It is blocked up or when a variety of causes failure is damaged by tar deposition when a wherein heat pipe in this way, do not influence other heat pipes
It works normally.
In specific implementation, heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at biomass high-temperature combustion gas
The top of pipeline.
The cold of heat exchange of heat pipe is flow to by the heat transfer medium of biomass high-temperature gas heating upwards in heat exchange of heat pipe
Solidifying section, and to flue gas recycled heat release in condensation segment, the adopting heat pipes for heat transfer medium after heat release is flowed down to heat by gravity
The evaporator section of heat exchange of heat pipe, and in evaporator section again by biomass high-temperature gas heating, repeatedly.
In the present embodiment, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater is sprayed by spray head
Spray drying tower, and evaporation and crystal process occurs after mixing with recycling hot fume.
In the present embodiment, spray drying tower bottom is equipped with ash bucket and storehouse pumps, the particle that desulfurization wastewater evaporative crystallization generates
It is collected into ash bucket, is pumped and is discharged by storehouse after the particle accumulation to preset height in ash bucket.
In the present embodiment, recycle cold flue gas entrance can be deduster after, the flue before air-introduced machine, be also possible to
Flue after air-introduced machine.When the flue extraction recycling cold flue gas after deduster, before air-introduced machine, on flue gas recirculation pipeline
It needs that gas recirculating fan is arranged；When recycling cold flue gas from the flue extraction after air-introduced machine, on flue gas recirculation pipeline
Gas recirculating fan can be set, gas recirculating fan can also be not provided with.
The present invention also provides a kind of work of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater
Method can remove the harmful substance in desulfurization wastewater, energy-saving and environment-friendly, and the crystallization of byproduct salt is with high purity, attached
Value added height.
A kind of working method of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the invention, packet
It includes:
Flue gas recycled is heated up biomass high-temperature combustion gas cooling down by heat exchange of heat pipe；
Biomass medium temperature combustion gas after cooling down enters coal unit combustion power generation；
Flue gas recycled after heating mixes after entering spray drying tower with the desulfurization wastewater sprayed in spray drying tower, real
Now to the evaporative crystallization of desulfurization wastewater, the salt crystalline particle of precipitation largely passes through the ash that natural subsidence enters spray drying tower
Bucket；
The flue gas that the flue gas come out from spray drying tower enters the flue of deduster entrance and coal unit air preheater exports
Enter dedusting in deduster after converging；Flue gas after dedusting is connected to air-introduced machine.
The present invention removes the harmful substance in desulfurization wastewater using the sensible heat of discarded biogas, not only energy conservation but also ring
It protects, and the purity is high of byproduct salt crystallization, added value are high.
System overhaul using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater of the invention is easy to maintain: working as coke
When single heat pipe caused by oil deposition or a variety of causes damages, remaining heat pipe remains to work normally.With conventional thermal conductive oil heat exchanger
Compare, each heat pipe of heat exchange of heat pipe can relatively independent work, have the advantages that insensitive to tar deposition, and tradition is led
When the tar of hot oil heat exchanger cleaning deposition, need to every root canal road power shovel tar removing, and heat exchange of heat pipe only need to quickly be taken out
Then the heat pipe damaged out changes new heat pipe, repair time and maintenance cost of labor is greatly saved.
The present invention is compared in the prior art using the sensible heat of biogas come heat-setting water, and the present invention is to therrmodynamic system
Without influence, therrmodynamic system can be designed by energy consumption and available energy loss are minimum.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater characterized by comprising heat pipe changes
Hot device, evaporator section are connected with biomass high-temperature gas pipeline, and condensation segment is connected with flue gas recycled pipeline；
The heat exchange of heat pipe is used for biomass high-temperature combustion gas cooling down, and flue gas recycled is heated up；After cooling down
Biomass medium temperature combustion gas enter coal unit combustion power generation；Flue gas recycled after heating enters after spray drying tower and spraying
The desulfurization wastewater mixing sprayed in drying tower, flue gas recycled enters the flue and coal unit air preheater of deduster entrance later
The flue gas of outlet enters dedusting in deduster after converging；The flue gas recycled pipeline is connected with the pipeline after deduster dedusting
It is logical.
2. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that the deduster is connected by air-introduced machine with desulfurization island, and the flue gas recycled pipeline draws from the flue after air-introduced machine
Out, and flue gas recycled pipeline by gas recirculating fan is connected to heat exchange of heat pipe.
3. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is, the deduster is connected by air-introduced machine with desulfurization island, and the flue gas recycled pipeline is after deduster and air-introduced machine
It is drawn on preceding flue, and flue gas recycled pipeline is connected to heat exchange of heat pipe by gas recirculating fan.
4. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that the heat exchange of heat pipe is constituted using at least two heat pipe parallel connections.
5. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that heat exchange of heat pipe uses gravity assisted heat pipe, and flue gas recycled pipeline is located at the top of biomass high-temperature gas pipeline.
6. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that the system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes desulfurization wastewater storage tank,
For keeping in the desulfurization wastewater of coal unit generation, when biomass gasifying furnace is gone into operation, then by the desulfurization in desulfurization wastewater storage tank
Waste water sprays into spray drying tower.
7. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that the system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater further includes air preheater bypass flue,
It draws from the flue before coal unit air preheater and accesses spray drying tower, the bypass flue gas come from air preheater bypass flue
Evaporation and crystal process occurs after mixing with desulfurization wastewater；When biomass gasifying furnace operates normally, on air preheater bypass flue
Air door is closed, and air preheater bypass flue is not run.
8. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is, the spray head of desulfurization wastewater is equipped in the spray drying tower, desulfurization wastewater by spray head penetrating spray drying tower, and with
Evaporation and crystal process occurs after recycling hot fume mixing.
9. a kind of system using biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as described in claim 1, special
Sign is that spray drying tower bottom is equipped with ash bucket and storehouse pumps, and the particle that desulfurization wastewater evaporative crystallization generates is collected into ash bucket, ash
It is pumped and is discharged by storehouse after particle accumulation to preset height in bucket.
10. a kind of utilize biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater as claimed in any one of claims 1-9 wherein
System working method characterized by comprising
Flue gas recycled is heated up biomass high-temperature combustion gas cooling down by heat exchange of heat pipe；
Biomass medium temperature combustion gas after cooling down enters coal unit combustion power generation；
Flue gas recycled after heating mixes after entering spray drying tower with the desulfurization wastewater sprayed in spray drying tower, realization pair
The evaporative crystallization of desulfurization wastewater, the salt crystalline particle of precipitation largely pass through the ash bucket that natural subsidence enters spray drying tower；
The flue gas that the flue that the flue gas come out from spray drying tower enters deduster entrance is exported with coal unit air preheater converges
Enter dedusting in deduster afterwards；Flue gas after dedusting is connected to air-introduced machine.
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| CN201810884955.6A CN109139158B (en) | 2018-08-06 | 2018-08-06 | System and method for reducing emission of desulfurization wastewater by using sensible heat of biomass gas and flue gas evaporation |
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Cited By (1)
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