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 PDF

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Publication number
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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CN201810884955.6A
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CN109139158B (en
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刘义达
祁金胜
高振宝
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Shandong Electric Power Engineering Consulting Institute Corp Ltd
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Shandong Electric Power Engineering Consulting Institute Corp Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08Plants 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00Steam engine plants not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00Plants 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

Utilize the system and method for biogas sensible heat and smoke evaporative emission reduction desulfurization wastewater
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.
CN201810884955.6A 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 Active CN109139158B (en)

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