CN215490930U - Coal fired power plant solid waste and wastewater cooperative treatment system - Google Patents
Coal fired power plant solid waste and wastewater cooperative treatment system Download PDFInfo
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- CN215490930U CN215490930U CN202120845114.1U CN202120845114U CN215490930U CN 215490930 U CN215490930 U CN 215490930U CN 202120845114 U CN202120845114 U CN 202120845114U CN 215490930 U CN215490930 U CN 215490930U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The utility model provides a coal-fired power plant solid waste and wastewater co-treatment system, and belongs to the technical field of power plant waste treatment. The utility model takes superheated steam as the main power of a steam pulverizer (1-2) and prepares furnace bottom slag and fly ash into superfine powder for high value utilization; the obtained first waste heat steam is respectively used for drying the desulfurized gypsum and the wastewater and drying the fuel coal to realize the cascade utilization of energy, the waste steam after the heat supply of the first waste heat steam enters a heat exchanger (4) to heat cold air, and hot air generated after the heat exchange can be used as preheating air of an air supplementing system of a boiler to realize the deep recycling of waste heat resources; and the first evaporation water vapor generated by the first drying and dehydrating device (2-2) and the second evaporation water vapor generated by the second drying and dehydrating device (3-1) enter the heat exchanger (4) to heat cold air, and condensed water generated after heat exchange enters a circulating water system of a power plant to realize water resource recycling, so that zero emission of wastewater is realized.
Description
Technical Field
The utility model relates to the technical field of waste treatment of power plants, in particular to a solid waste and wastewater co-treatment system of a coal-fired power plant.
Background
During the operation of coal-fired power plants, solid waste and waste water are inevitably generated. The disposal of solid waste and waste water from coal-fired power plants can add significant cost to the power plant.
For the treatment of solid waste, the existing power plants usually carry out resource processing and utilization on the solid waste, but high energy consumption is generated in the processing and utilization process; in order to realize zero discharge of wastewater, most of the existing coal-fired power plants adopt a treatment mode of 'pretreatment softening + nanofiltration salt separation + membrane concentration + evaporative crystallization', but the technology has huge investment and high operation cost, and cannot be popularized and applied in a large range in the power plants; and part of coal-fired power plants directly spray the wastewater into the flue gas, the wastewater is evaporated by using the waste heat of the flue gas, and water vapor is directly discharged into the atmosphere along with the flue gas after evaporation.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide a coal-fired power plant solid waste and wastewater co-treatment system. The treatment system provided by the utility model can not only realize the cooperative treatment of the solid waste and the wastewater of the coal-fired power plant and realize the zero discharge of the wastewater, but also fully utilize the waste heat resource in the treatment process and realize the low-cost treatment and the resource full utilization of the solid waste and the wastewater of the coal-fired power plant.
In order to achieve the purpose of the utility model, the utility model provides the following technical scheme:
the utility model provides a coal-fired power plant solid waste and wastewater co-treatment system, which comprises a material treatment system and a heat exchange system, wherein the material treatment system comprises a material inlet, a material outlet, a heat exchange system and a heat exchange system;
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1, a desulfurization gypsum and wastewater comprehensive treatment system 2 and a fuel drying system 3;
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1 and a mixing device 1-1, wherein the mixing device 1-1 is provided with a fly ash inlet, a crushing furnace bottom slag inlet and a mixture outlet;
a steam pulverizer 1-2 with an inlet communicated with the mixture outlet;
the comprehensive desulfurization gypsum and wastewater treatment system 2 comprises a stirring device 2-1, wherein the stirring device 2-1 is provided with a desulfurization gypsum inlet, a wastewater inlet and a mixed slurry outlet;
the inlet of the first drying and dehydrating device 2-2 is communicated with the mixed slurry outlet, and the first drying and dehydrating device 2-2 is provided with a first evaporated water vapor outlet and a desulfurized gypsum dry powder outlet;
the fuel drying system 3 comprises a second drying and dehydrating device 3-1, and the second drying and dehydrating device 3-1 is provided with a fuel inlet, a second evaporated water vapor outlet and a dried fuel outlet;
the heat exchange system comprises a first heat exchange pipeline I positioned in the supersonic steam pulverizer 1-2, and the first heat exchange pipeline I is provided with a superheated steam inlet and a first residual steam outlet;
the second heat exchange pipeline II is positioned in the first drying and dehydrating device 2-2 and is provided with a first residual steam inlet and a first residual steam outlet; the first waste steam inlet is communicated with the first waste steam outlet;
a third heat exchange pipeline III positioned in the second drying and dehydrating device 3-1, wherein the third heat exchange pipeline III is provided with a second residual steam inlet and a second residual steam outlet; the second waste steam inlet is communicated with the first waste steam outlet;
the heat exchange system also comprises a heat exchanger 4, and the heat exchanger 4 is provided with an evaporation water vapor inlet, a residual steam inlet, a cold air inlet, a hot air outlet and a condensed water outlet; the evaporation water vapor inlet is communicated with the first evaporation water vapor outlet and the second evaporation water vapor outlet; the residual steam inlet is communicated with the first residual steam outlet and the second residual steam outlet.
Preferably, the steam pulverizer 1-2 is a supersonic steam pulverizer
Preferably, the comprehensive treatment system 1 for the bottom slag and the fly ash further comprises a fly ash powder concentrator 1-3, the fly ash powder concentrator 1-3 is provided with a fly ash raw material inlet, a fine fly ash outlet and a coarse fly ash outlet, and the coarse fly ash outlet is communicated with the fly ash inlet of the mixing device 1-1.
Preferably, the comprehensive treatment system 1 for the furnace bottom slag and the fly ash further comprises a furnace bottom slag crusher 1-4 and a sieving machine 1-5 which are sequentially communicated;
the furnace bottom slag crusher 1-4 is provided with a furnace bottom slag raw material inlet and a crushed material outlet;
the screening machine 1-5 is provided with a crushed material inlet, an oversize material outlet and an undersize material outlet, and the undersize material outlet is communicated with a furnace bottom slag inlet of the mixing device 1-1; the oversize outlet is communicated with a furnace bottom slag raw material inlet of the furnace bottom slag crusher 1-4;
the screen mesh of the screening machine 1-5 is 30-60 meshes.
Preferably, a lifter 1-16 is arranged between the oversize product outlet of the sieving machine 1-5 and the hearth slag raw material inlet of the hearth slag crusher 1-4.
Preferably, a second induced draft fan 5-2 is arranged between the pipeline communicated with the first residual steam outlet and the heat exchanger 4; a third induced draft fan 5-3 is arranged between the second residual steam outlet and the pipeline communicated with the heat exchanger 4; a fourth induced draft fan 5-4 is arranged between the cold air and the pipeline communicated with the cold air inlet; and a fifth induced draft fan 5-5 is arranged at the hot air outlet.
The utility model provides a coal-fired power plant solid waste and wastewater co-treatment system, which comprises a material treatment system and a heat exchange system, wherein the material treatment system comprises a material inlet, a material outlet, a heat exchange system and a heat exchange system; in the utility model, the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1, a desulfurization gypsum and wastewater comprehensive treatment system 2 and a fuel drying system 3; the furnace bottom slag and the fly ash are mixed and crushed by using the comprehensive treatment system 1 for the furnace bottom slag and the fly ash, and the obtained fly ash and furnace bottom slag mixed powder ultrafine powder can be sold as a finished product and used as an active admixture for cement and concrete; according to the utility model, the desulfurization gypsum and wastewater comprehensive treatment system 2 is utilized to stir, dry and dehydrate the desulfurization gypsum and wastewater, and the dehydrated desulfurization gypsum dry powder can be sold as a finished product; the utility model utilizes the fuel drying system 3 to dry the fuel, and the obtained dry fuel can directly enter a boiler to be combusted for power generation.
In the utility model, the heat exchange system comprises a first heat exchange pipeline I positioned in the steam pulverizer 1-2, a second heat exchange pipeline II positioned in the first drying and dehydrating device 2-2, a third heat exchange pipeline III positioned in the second drying and dehydrating device 3-1, and a heat exchanger 4. The utility model takes superheated steam as the main power of a steam pulverizer 1-2, and prepares furnace bottom slag and fly ash into superfine powder for high value utilization; the obtained first waste heat steam respectively enters a second heat exchange pipeline II positioned in the first drying and dehydrating device 2-2 and a third heat exchange pipeline III positioned in the second drying and dehydrating device 3-1 and is used for drying desulfurized gypsum and wastewater and drying fuel to realize the cascade utilization of energy, the waste gas after heat supply of the first waste heat steam enters a heat exchanger 4 to heat cold air, and hot air generated after heat exchange can be used as preheating air of an air supplementing system of a boiler to realize the deep recycling of waste heat resources; the first evaporation water vapor generated by the first drying and dehydrating device 2-2 and the second evaporation water vapor generated by the second drying and dehydrating device 3-1 enter the heat exchanger 4 to heat cold air, and condensed water generated after heat exchange can enter a circulating water system of a power plant to realize water resource recycling, so that zero emission of waste water is realized.
Drawings
FIG. 1 is a schematic view of a coal-fired power plant solid waste and wastewater co-treatment system according to the present invention;
FIG. 2 is a schematic view of a coal-fired power plant solid waste and wastewater co-treatment system in a preferred embodiment of the present invention;
in the drawings 1 and 2, 1-1 is a mixing device, 1-2 is a steam pulverizer, 1-3 is a fly ash powder concentrator, 1-4 is a furnace bottom slag pulverizer, 1-5 is a sieving machine, 1-6 is a first spiral powder conveyor, 1-7 is a powder collector, 1-8 is a first pneumatic powder conveyor, 1-9 is a first finished powder bin, 1-10 is a first buffer powder bin, 1-11 is a second pneumatic powder conveyor, 1-12 is a third pneumatic powder conveyor, 1-13 is a second finished powder bin, 1-14 is a second buffer powder bin, 1-15 is a first spiral powder conveyor, 1-16 is a lifting machine, 1-17 is a fourth pneumatic powder conveyor, 1-18 is a third buffer powder bin, 1-19 is a second spiral powder conveyor, 2-1 is a stirring device, 2-2 is a first drying and dehydrating device, 2-3 is a first belt conveyor, 2-4 is a wastewater pump, 2-5 is a slurry conveying pump, 2-6 is a third spiral powder conveying machine, 2-7 is a fifth pneumatic powder conveying machine, 2-8 is a third finished product powder bin, 3-1 is a second drying and dehydrating device, 3-2 is a fuel buffer bin, 3-3 is a spiral feeder, 3-4 is a second belt conveyor, 4 is a heat exchanger, 5-1 is a first induced draft fan, 5-2 is a second induced draft fan, 5-3 is a third induced draft fan, 5-4 is a fourth induced draft fan, 5-5 is a fifth induced draft fan, and 6 is a condensate water pump.
Detailed Description
The utility model provides a coal-fired power plant solid waste and wastewater co-treatment system, which comprises a material treatment system and a heat exchange system, wherein the material treatment system comprises a material inlet, a material outlet, a heat exchange system and a heat exchange system;
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1, a desulfurization gypsum and wastewater comprehensive treatment system 2 and a fuel drying system 3;
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1 and a mixing device 1-1, wherein the mixing device 1-1 is provided with a fly ash inlet, a crushing furnace bottom slag inlet and a mixture outlet;
a steam pulverizer 1-2 with an inlet communicated with the mixture outlet;
the comprehensive desulfurization gypsum and wastewater treatment system 2 comprises a stirring device 2-1, wherein the stirring device 2-1 is provided with a desulfurization gypsum inlet, a wastewater inlet and a mixed slurry outlet;
the inlet of the first drying and dehydrating device 2-2 is communicated with the mixed slurry outlet, and the first drying and dehydrating device 2-2 is provided with a first evaporated water vapor outlet and a desulfurized gypsum dry powder outlet;
the fuel drying system 3 comprises a second drying and dehydrating device 3-1, and the second drying and dehydrating device 3-1 is provided with a fuel inlet and a second evaporated water vapor outlet;
the heat exchange system comprises a first heat exchange pipeline I positioned in the supersonic steam pulverizer 1-2, and the first heat exchange pipeline I is provided with a superheated steam inlet and a first residual steam outlet;
the second heat exchange pipeline II is positioned in the first drying and dehydrating device 2-2 and is provided with a first residual steam inlet and a first residual steam outlet; the first waste steam inlet is communicated with the first waste steam outlet;
a third heat exchange pipeline III positioned in the second drying and dehydrating device 3-1, wherein the third heat exchange pipeline III is provided with a second residual steam inlet and a second residual steam outlet; the second waste steam inlet is communicated with the first waste steam outlet;
the heat exchange system also comprises a heat exchanger 4, and the heat exchanger 4 is provided with an evaporation water vapor inlet, a residual steam inlet, a cold air inlet, a hot air outlet and a condensed water outlet; the evaporation water vapor inlet is communicated with the first evaporation water vapor outlet and the second evaporation water vapor outlet; the residual steam inlet is communicated with the first residual steam outlet and the second residual steam outlet.
In the utility model, the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system 1, the furnace bottom slag and fly ash comprehensive treatment system 1 comprises a mixing device 1-1, and the mixing device 1-1 is provided with a fly ash inlet, a crushing furnace bottom slag inlet and a mixture outlet. The utility model has no special requirements on the mixing device 1-1, and the mixing device 1-1 well known in the art can be used, such as a mixer. The utility model has no special requirements on the arrangement positions of the fly ash inlet, the crushing furnace bottom slag inlet and the mixture outlet, and can be designed correspondingly according to the actual situation.
In the utility model, the comprehensive treatment system 1 for the furnace bottom slag and the fly ash comprises a steam pulverizer 1-2, wherein an inlet of the steam pulverizer is communicated with an outlet of the mixture. In the present invention, the steam pulverizer 1-2 is preferably a supersonic steam pulverizer 1-2.
In the present invention, when the steam pulverizer 1-2 is a supersonic steam pulverizer 1-2, the supersonic steam pulverizer 1-2 can utilize supersonic jet entrainment force of superheated steam to mix and entrain furnace slag and fly ash into high-speed steam flow, then utilizes collision impact force of the high-speed steam to cause mutual high-speed collision among solid particles in the steam to realize instant pulverization of the solid particles, the pulverized fine particles enter a grading device of the supersonic steam pulverizer 1-2 along with the steam, under the centrifugal and impact action of a grading device, the crushed solid particles are separated into ultrafine powder particles and coarser particles, wherein, the ultrafine powder particles flow out of the supersonic steam pulverizer 1-2 along with the steam flow, the coarser particles return to be involved in the supersonic steam flow again, and the secondary pulverization is carried out until the particles meet the requirement of the size of the ultrafine powder particles.
In the present invention, a first screw conveyor 1-6 is preferably provided between the mixing device 1-1 and the steam pulverizer 1-2. In the utility model, the outlet of the steam pulverizer 1-2 is preferably communicated with a powder collector 1-7, and the powder in the powder collector 1-7 is conveyed to a first finished powder bin 1-9 for storage through a first pneumatic powder conveyer 1-8.
In the utility model, the comprehensive treatment system 1 for the furnace bottom slag and the fly ash further comprises a fly ash powder selecting machine 1-3, wherein the fly ash powder selecting machine 1-3 is provided with a fly ash raw material inlet, a fine fly ash outlet and a coarse fly ash outlet, and the coarse fly ash outlet is communicated with the fly ash inlet of the mixing device 1-1. The utility model has no special requirements on the types of the fly ash powder separators 1-3, and the powder separators well known to the technical personnel in the field can be used. In the utility model, the fly ash is preferably placed in the first cache powder bin 1-10 and is conveyed to the powder concentrator through the second pneumatic powder conveyer 1-11. In the utility model, the median diameter D50 of the fine fly ash screened by the fly ash screening machine 1-3 is preferably 5-15 μm, and more preferably 8-10 μm. In the utility model, the fine fly ash screened by the fly ash screening machine 1-3 is preferably sent to a second finished product powder bin 1-13 through a third pneumatic powder conveyer 1-12 for storage. In the utility model, the fine fly ash screened by the fly ash screening machine 1-3 can be sold as a finished product.
In the utility model, the coarse coal ash screened by the coal ash screening machine 1-3 is preferably placed in a second buffer powder bin 1-14 and is conveyed to a mixing device 1-1 through a first spiral coal conveyor 1-15.
In the utility model, the comprehensive treatment system 1 for the furnace bottom slag and the fly ash also preferably comprises a furnace bottom slag crusher 1-4 and a sieving machine 1-5 which are communicated in sequence. In the present invention, the bottom slag crusher 1-4 is preferably provided with a bottom slag raw material inlet and a crushed material outlet. The present invention does not require any particular kind of bottom slag crusher 1-4, and a crusher well known to those skilled in the art may be used.
In the utility model, the screening machine 1-5 is preferably provided with a crushed material inlet, an oversize material outlet and an undersize material outlet, and the undersize material outlet is communicated with a furnace bottom slag inlet of the mixing device 1-1; the oversize outlet is communicated with the furnace bottom slag raw material inlet of the furnace bottom slag crusher 1-4. The present invention does not require any particular type of screening machine 1-5, and it is sufficient to use a screening machine 1-5 known to those skilled in the art. In the utility model, the screen mesh of the screening machine 1-5 is preferably 30-60 meshes, and more preferably 40-50 meshes.
In the utility model, the furnace bottom slag is preferably arranged in a furnace bottom slag bin, and the furnace bottom slag bin is communicated with furnace bottom slag raw material inlets of the furnace bottom slag crushers 1 to 4. In the utility model, a lifter 1-16 is preferably arranged between the oversize product outlet of the sieving machine 1-5 and the hearth slag raw material inlet of the hearth slag crusher 1-4. The utility model has no special requirements as to the type of elevator in question, but it is sufficient if the elevator, which is well known to the person skilled in the art, is capable of conveying material.
In the utility model, the undersize material of the screening machine 1-5 is preferably conveyed to a third buffer powder bin 1-18 for buffering through a fourth pneumatic powder conveyer 1-17, and the furnace bottom slag in the third buffer powder bin 1-18 is preferably conveyed to a mixing device 1-1 through a second spiral powder conveyer 1-19.
In the utility model, the comprehensive treatment system 2 for the desulfurized gypsum and the wastewater comprises a stirring device 2-1, wherein the stirring device 2-1 is provided with a desulfurized gypsum inlet, a wastewater inlet and a mixed slurry outlet; the present invention does not require any special kind of stirring device 2-1, and a stirring device 2-1 having a numerical value suitable for those skilled in the art may be used. The arrangement positions of the desulfurized gypsum inlet, the waste water inlet and the mixed slurry outlet are not required to be special, and the desulfurization gypsum mixing device is designed correspondingly according to actual conditions. In the utility model, the desulfurized gypsum is preferably conveyed to the stirring device 2-1 by the first belt conveyor 2-3; the desulfurization waste water is preferably conveyed to the stirring device 2-1 by a waste water pump 2-4.
In the utility model, the comprehensive treatment system 2 for the desulfurized gypsum and the wastewater comprises a first drying and dehydrating device 2-2, an inlet of which is communicated with the mixed slurry outlet, and the first drying and dehydrating device 2-2 is provided with a first evaporated water vapor outlet and a desulfurized gypsum dry powder outlet. The present invention does not require any particular kind of the first drying and dehydrating device 2-2, and any drying and dehydrating device known to those skilled in the art may be used. The arrangement positions of the first evaporation water vapor outlet and the desulfurized gypsum dry powder outlet are not required to be special, and the device can be designed correspondingly according to actual conditions. In the utility model, a slurry conveying pump 2-5 is preferably arranged between the pipelines for communicating the stirring device 2-1 with the first drying device.
In the utility model, the dry desulfurized gypsum powder generated by the first drying and dehydrating device 2-2 is preferably conveyed to the third finished product powder bin 2-8 through the third spiral powder conveyor 2-6 and the fifth pneumatic powder conveyor 2-7 in sequence for storage.
In the present invention, the fuel drying system 3 includes a second drying and dehydrating device 3-1, and the second drying and dehydrating device 3-1 is provided with a fuel inlet and a second evaporated water vapor outlet. The present invention does not require any particular kind of second dewatering device, and a dewatering device known to those skilled in the art may be used. The second drying and dehydrating device 3-1 is provided with a fuel inlet and a second evaporated water vapor outlet, and the arrangement positions of the fuel inlet and the second evaporated water vapor outlet are not required to be special, so that the device can be designed correspondingly according to actual conditions. In the present invention, the fuel is preferably stored in a fuel buffer 3-2 and is delivered to the second drying and dehydrating device 3-1 by a screw feeder 3-3. In the present invention, after the second drying and dehydrating device 3-1 dries and dehydrates the fuel, the resultant dried fuel is preferably conveyed to the boiler by the second belt conveyor 3-4.
In the utility model, the heat exchange system comprises a first heat exchange pipeline I positioned in the supersonic steam pulverizer 1-2, and the first heat exchange pipeline I is provided with a superheated steam inlet and a first residual steam outlet. The utility model realizes heat supply to the steam pulverizer 1-2 through the first heat exchange pipeline I.
In the utility model, the heat exchange system comprises a second heat exchange pipeline II positioned in the first drying and dehydrating device 2-2, and the second heat exchange pipeline II is provided with a first residual steam inlet and a first residual steam outlet; the first waste steam inlet is communicated with the first waste steam outlet. According to the utility model, the heat supply for drying the desulfurized gypsum slurry is realized through the second heat exchange pipeline II.
In the utility model, the heat exchange system comprises a third heat exchange pipeline III positioned in the second drying and dehydrating device 3-1, and the third heat exchange pipeline III is provided with a second residual steam inlet and a second residual steam outlet; the second waste steam inlet is communicated with the first waste steam outlet. According to the utility model, heat supply in the fuel drying process is realized through the third heat exchange pipeline III.
In the utility model, a first induced draft fan 5-1 is preferably arranged between the first residual steam outlet and the first and second pipelines for communicating the steam inlets.
In the present invention, the heat exchange system further comprises a heat exchanger 4, and the heat exchanger 4 is preferably a dividing wall type heat exchanger 4. In the utility model, the heat exchanger 4 is provided with an evaporation water vapor inlet, a residual steam inlet, a cold air inlet, a hot air outlet and a condensed water outlet; the evaporation water vapor inlet is communicated with the first evaporation water vapor outlet and the second evaporation water vapor outlet; the residual steam inlet is communicated with the first residual steam outlet and the second residual steam outlet. In the utility model, a second induced draft fan 5-2 is preferably arranged between the pipelines for communicating the first residual steam outlet with the heat exchanger 4; a third induced draft fan 5-3 is preferably arranged between the second residual steam outlet and the pipeline communicated with the heat exchanger 4; a fourth induced draft fan 5-4 is preferably arranged between the cold air and the pipeline communicated with the cold air inlet; and a fifth induced draft fan 5-5 is preferably arranged at the hot air outlet. In the present invention, the condensed water outlet is preferably provided with a condensed water pump 6.
In the utility model, a schematic diagram of the coal-fired power plant solid waste and wastewater co-treatment system is shown in FIG. 1, and a schematic diagram of a preferred scheme is shown in FIG. 2; in the drawings 1 and 2, 1-1 is a mixing device, 1-2 is a steam pulverizer, 1-3 is a fly ash powder concentrator, 1-4 is a furnace bottom slag pulverizer, 1-5 is a sieving machine, 1-6 is a first spiral powder conveyor, 1-7 is a powder collector, 1-8 is a first pneumatic powder conveyor, 1-9 is a first finished powder bin, 1-10 is a first buffer powder bin, 1-11 is a second pneumatic powder conveyor, 1-12 is a third pneumatic powder conveyor, 1-13 is a second finished powder bin, 1-14 is a second buffer powder bin, 1-15 is a first spiral powder conveyor, 1-16 is a lifting machine, 1-17 is a fourth pneumatic powder conveyor, 1-18 is a third buffer powder bin, 1-19 is a second spiral powder conveyor, 2-1 is a stirring device, 2-2 is a first drying and dehydrating device, 2-3 is a first belt conveyor, 2-4 is a wastewater pump, 2-5 is a slurry conveying pump, 2-6 is a third spiral powder conveying machine, 2-7 is a fifth pneumatic powder conveying machine, 2-8 is a third finished product powder bin, 3-1 is a second drying and dehydrating device, 3-2 is a fuel buffer bin, 3-3 is a spiral feeder, 3-4 is a second belt conveyor, 4 is a heat exchanger, 5-1 is a first induced draft fan, 5-2 is a second induced draft fan, 5-3 is a third induced draft fan, 5-4 is a fourth induced draft fan, 5-5 is a fifth induced draft fan, and 6 is a condensate water pump.
In the utility model, the method for performing the cooperative treatment on the solid waste and the wastewater of the coal-fired power plant based on the system for performing the cooperative treatment on the solid waste and the wastewater of the coal-fired power plant comprises the following steps:
the fly ash and the furnace bottom slag enter a mixing device 1-1 to be mixed to obtain a mixture, and the mixture enters a steam grinder 1-2 to be ground to obtain fly ash and furnace bottom slag mixed powder superfine powder; the heat of the steam pulverizer 1-2 comes from superheated steam, and first residual steam generated after the superheated steam supplies heat enters a second heat exchange pipeline II and a third heat exchange pipeline III;
the desulfurization gypsum and the wastewater enter a stirring device 2-1 to be stirred to obtain mixed slurry, the mixed slurry enters a first drying and dehydrating device 2-2 to be subjected to first drying and dehydrating to obtain desulfurization gypsum dry powder and first evaporated water vapor, and the first evaporated water vapor enters a heat exchanger 4; the heat of the first drying dehydration comes from first residual steam, and the first residual steam generated after the heat supply of the first residual steam enters a heat exchanger 4;
the fuel enters a second drying and dehydrating device 3-1 to be subjected to second drying and dehydrating to obtain dry fuel and second evaporation water vapor, and the second evaporation water vapor enters a heat exchanger 4; the heat of the second drying dehydration comes from the first residual steam, and the second residual steam generated after the heat supply of the first residual steam enters the heat exchanger 4;
and cold air enters the heat exchanger 4 to exchange heat with the first residual steam, the second residual steam, the first evaporation water vapor and the second evaporation water vapor to obtain hot air and condensed water.
In the utility model, fly ash and furnace bottom slag are mixed in a mixing device 1-1 to obtain a mixture, and the mixture is crushed in a steam crusher 1-2 to obtain fly ash and furnace bottom slag mixed powder superfine powder. In the utility model, the mass ratio of the fly ash to the bottom slag is preferably 0.6-1: 1, and more preferably 0.7-0.8: 1. In the utility model, the particle size of the fly ash is preferably below a sieve of 30-60 meshes; the grain size of the furnace bottom slag is preferably 30-60 meshes below the sieve.
The utility model does not require any particular mixing means, such as stirring, known to the person skilled in the art. In the utility model, the steam jet speed of the steam pulverizer 1-2 is preferably 450-550 m/s, more preferably 480-500 m/s, and the frequency of the classifier of the steam pulverizer 1-2 is preferably 60-100 Hz, more preferably 80 Hz; in the utility model, the median diameter D50 of the superfine powder of the fly ash and furnace bottom slag mixed powder is preferably 5-15 μm, and more preferably 8-10 μm. In the utility model, the temperature of the superheated steam is preferably 300-350 ℃, more preferably 320-340 ℃, and the pressure is preferably 1.0-1.5 MPa, more preferably 1.2-1.4 MPa.
According to the utility model, desulfurized gypsum and wastewater enter a stirring device 2-1 to be stirred to obtain mixed slurry, and the mixed slurry enters a first drying and dehydrating device 2-2 to be subjected to first drying and dehydrating to obtain desulfurized gypsum dry powder and first evaporated water vapor. The desulfurization gypsum of the present invention is not particularly limited, and those known to those skilled in the art can be used. In the present invention, the wastewater is preferably a coal-fired power plant wastewater, more preferably a coal-fired power plant desulfurization wastewater. As an embodiment of the utility model, the coal-fired power plant desulfurization wastewater preferably contains 90% of water and 10% of salt substances by mass percentage, and the salt substances preferably comprise desulfurized gypsum and chloride ions, sodium ions and magnesium ions.
In the utility model, the mass ratio of the desulfurized gypsum to the wastewater is preferably 1: 2-2.5, and more preferably 1: 2.2-2.4; in the utility model, the temperature of the first residual steam is preferably 120-200 ℃, and more preferably 140-160 ℃; the pressure is preferably 0.1 to 0.5MPa, more preferably 0.2 to 0.4 MPa. In the utility model, the water content of the desulfurized gypsum dry powder is preferably less than or equal to 1 percent.
In the utility model, the fuel enters the second drying and dehydrating device 3-1 to be subjected to second drying and dehydrating to obtain dry fuel and second evaporated water vapor. In the present invention, the fuel is preferably coal. In the utility model, the temperature of the first residual steam is preferably 120-200 ℃, and more preferably 140-160 ℃; the pressure is preferably 0.1 to 0.5MPa, more preferably 0.2 to 0.4 MPa.
In the utility model, cold air enters the heat exchanger 4 to exchange heat with the first residual steam, the second residual steam, the first evaporation water vapor and the second evaporation water vapor to obtain hot air and condensed water. In the utility model, the flow speed of the cold air is preferably 10-15 m/s; the temperature of the hot air is preferably 85-95 ℃, and more preferably 90 ℃; the temperature of the condensed water is preferably 65-85 ℃, and more preferably 70-80 ℃.
The coal-fired power plant solid waste and wastewater co-treatment system provided by the utility model is described in detail by the following examples, but the utility model is not to be construed as being limited by the scope of the utility model.
Example 1
The coal-fired power plant solid waste and wastewater synergistic treatment system shown in fig. 1 is used for treating fly ash, furnace bottom slag, desulfurization gypsum and desulfurization wastewater generated by a coal-fired power plant, and the method comprises the following steps:
feeding the fly ash with the grain size of 30-60 meshes and the furnace bottom slag with the grain size of 30-60 meshes into a mixing device 1-1 according to a mass ratio of 0.6:1 for mixing to obtain a mixture, and feeding the mixture into a steam grinder 1-2 for grinding to obtain fly ash and furnace bottom slag mixed powder superfine powder, wherein the grain size of the superfine powder is 5-15 microns; the heat of the steam pulverizer 1-2 comes from superheated steam, wherein the temperature of the superheated steam is 350 ℃, the pressure of the superheated steam is 1MPa, the temperature of first residual steam generated after the superheated steam supplies heat is 150 ℃, and the pressure of the first residual steam is 0.1MPa, and the first residual steam and the third residual steam respectively enter a second heat exchange pipeline II and a third heat exchange pipeline III;
the desulfurization gypsum and the desulfurization wastewater enter a stirring device 2-1 to be stirred according to the mass ratio of 1:2 to obtain mixed slurry, the mixed slurry enters a first drying and dehydrating device 2-2 to be subjected to first drying and dehydrating to obtain desulfurization gypsum dry powder and first evaporation water vapor, and the first evaporation water vapor enters a heat exchanger 4; the heat of the first drying dehydration is from first residual steam, the temperature of the first residual steam generated after the heat supply of the first residual steam is 105 ℃, the pressure is 0.05MPa, and the first residual steam enters the heat exchanger 4;
the fuel enters a second drying and dehydrating device 3-1 to be subjected to second drying and dehydrating to obtain dry fuel and second evaporation water vapor, and the second evaporation water vapor enters a heat exchanger 4; the heat of the second drying dehydration is from the first residual steam, the temperature of the second residual steam generated after the heat supply of the first residual steam is 110 ℃, the pressure is 0.08MPa, and the second residual steam enters the heat exchanger 4;
cold air enters the heat exchanger 4 to exchange heat with the first residual steam, the second residual steam, the first evaporation water vapor and the second evaporation water vapor, so that hot air at 90 ℃ and condensed water at 65 ℃ are obtained.
Example 2
The coal-fired power plant solid waste and wastewater synergistic treatment system shown in fig. 1 is used for treating fly ash, furnace bottom slag, desulfurization gypsum and desulfurization wastewater generated by a coal-fired power plant, and the method comprises the following steps:
feeding the fly ash with the grain size of 30-60 meshes and the furnace bottom slag with the grain size of 30-60 meshes into a mixing device 1-1 according to a mass ratio of 0.8:1 to mix to obtain a mixture, and feeding the mixture into a steam grinder 1-2 to grind to obtain fly ash and furnace bottom slag mixed powder superfine powder, wherein the grain size of the superfine powder is 5-15 microns; the heat of the steam pulverizer 1-2 comes from superheated steam, wherein the temperature of the superheated steam is 300 ℃, the pressure of the superheated steam is 1.2MPa, the temperature of first residual steam generated after the superheated steam supplies heat is 120 ℃, and the pressure of the first residual steam is 0.2MPa, and the first residual steam respectively enter a second heat exchange pipeline II and a third heat exchange pipeline III;
the desulfurization gypsum and the desulfurization wastewater enter a stirring device 2-1 to be stirred according to the mass ratio of 1:2.2 to obtain mixed slurry, the mixed slurry enters a first drying and dehydrating device 2-2 to be subjected to first drying and dehydrating to obtain desulfurization gypsum dry powder and first evaporation water vapor, and the first evaporation water vapor enters a heat exchanger 4; the heat of the first drying dehydration comes from first residual steam, the temperature of the first residual steam generated after the heat supply of the first residual steam is 110 ℃, the pressure is 0.05MPa, and the first residual steam enters a heat exchanger 4;
the fuel enters a second drying and dehydrating device 3-1 to be subjected to second drying and dehydrating to obtain dry fuel and second evaporation water vapor, and the second evaporation water vapor enters a heat exchanger 4; the heat of the second drying dehydration is from the first residual steam, the temperature of the second residual steam generated after the heat supply of the first residual steam is 110 ℃, the pressure is 0.08MPa, and the second residual steam enters the heat exchanger 4;
cold air enters the heat exchanger 4 to exchange heat with the first residual steam, the second residual steam, the first evaporation water vapor and the second evaporation water vapor, so that hot air at 85 ℃ and condensed water at 70 ℃ are obtained.
Example 3
The coal-fired power plant solid waste and wastewater synergistic treatment system shown in fig. 1 is used for treating fly ash, furnace bottom slag, desulfurization gypsum and desulfurization wastewater generated by a coal-fired power plant, and the method comprises the following steps:
the method comprises the following steps of feeding fly ash with the grain size of 30-60 meshes and furnace bottom slag with the grain size of 30-60 meshes into a mixing device 1-1 according to a mass ratio of 1:1 for mixing to obtain a mixture, feeding the mixture into a steam grinder 1-2 for grinding to obtain fly ash and furnace bottom slag mixed powder superfine powder, wherein the grain size of the superfine powder is 5-15 microns; the heat of the steam pulverizer 1-2 comes from superheated steam, wherein the temperature of the superheated steam is 320 ℃, the pressure of the superheated steam is 1.5MPa, the temperature of first residual steam generated after the superheated steam supplies heat is 180 ℃, and the pressure of the first residual steam is 0.5MPa, and the first residual steam respectively enter a second heat exchange pipeline II and a third heat exchange pipeline III;
the desulfurization gypsum and the desulfurization wastewater enter a stirring device 2-1 to be stirred according to the mass ratio of 1:2.5 to obtain mixed slurry, the mixed slurry enters a first drying and dehydrating device 2-2 to be subjected to first drying and dehydrating to obtain desulfurization gypsum dry powder and first evaporation water vapor, and the first evaporation water vapor enters a heat exchanger 4; the heat of the first drying dehydration is from first residual steam, the temperature of the first residual steam generated after the heat supply of the first residual steam is 102 ℃, the pressure is 0.05MPa, and the first residual steam enters the heat exchanger 4;
the fuel enters a second drying and dehydrating device 3-1 to be subjected to second drying and dehydrating to obtain dry fuel and second evaporation water vapor, and the second evaporation water vapor enters a heat exchanger 4; the heat of the second drying dehydration is from the first residual steam, the temperature of the second residual steam generated after the heat supply of the first residual steam is 110 ℃, the pressure is 0.08MPa, and the second residual steam enters the heat exchanger 4;
cold air enters the heat exchanger 4 to exchange heat with the first residual steam, the second residual steam, the first evaporation water vapor and the second evaporation water vapor, and hot air at 95 ℃ and condensed water at 85 ℃ are obtained.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A coal-fired power plant solid waste and wastewater cooperative treatment system comprises a material treatment system and a heat exchange system;
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system (1), a desulfurization gypsum and wastewater comprehensive treatment system (2) and a fuel drying system (3);
the material treatment system comprises a furnace bottom slag and fly ash comprehensive treatment system (1) and a mixing device (1-1), wherein the mixing device (1-1) is provided with a fly ash inlet, a crushing furnace bottom slag inlet and a mixture outlet;
a supersonic steam pulverizer (1-2) with an inlet communicated with the mixture outlet;
the desulfurization gypsum and wastewater comprehensive treatment system (2) comprises a stirring device (2-1), wherein the stirring device (2-1) is provided with a desulfurization gypsum inlet, a wastewater inlet and a mixed slurry outlet;
the inlet of the first drying and dehydrating device (2-2) is communicated with the mixed slurry outlet, and the first drying and dehydrating device (2-2) is provided with a first evaporation water vapor outlet and a desulfurized gypsum dry powder outlet;
the fuel drying system (3) comprises a second drying and dehydrating device (3-1), and the second drying and dehydrating device (3-1) is provided with a fuel inlet, a second evaporated water vapor outlet and a dried fuel outlet;
the heat exchange system comprises a first heat exchange pipeline (I) positioned in the supersonic steam pulverizer (1-2), and the first heat exchange pipeline (I) is provided with a superheated steam inlet and a first residual steam outlet;
the second heat exchange pipeline (II) is positioned in the first drying and dehydrating device (2-2) and is provided with a first residual steam inlet and a first residual steam outlet; the first waste steam inlet is communicated with the first waste steam outlet;
a third heat exchange pipeline (III) positioned in the second drying and dehydrating device (3-1), wherein the third heat exchange pipeline (III) is provided with a second residual steam inlet and a second residual steam outlet; the second waste steam inlet is communicated with the first waste steam outlet;
the heat exchange system also comprises a heat exchanger (4), and the heat exchanger (4) is provided with an evaporation water vapor inlet, a residual steam inlet, a cold air inlet, a hot air outlet and a condensed water outlet; the evaporation water vapor inlet is communicated with the first evaporation water vapor outlet and the second evaporation water vapor outlet; the residual steam inlet is communicated with the first residual steam outlet and the second residual steam outlet.
2. The system for co-processing solid waste and wastewater of a coal-fired power plant as defined in claim 1, wherein the system (1) for comprehensive treatment of bottom slag and fly ash further comprises a fly ash powder concentrator (1-3), the fly ash powder concentrator (1-3) is provided with a fly ash raw material inlet, a fine fly ash outlet and a coarse fly ash outlet, and the coarse fly ash outlet is communicated with the fly ash inlet of the mixing device (1-1).
3. The coal-fired power plant solid waste and wastewater co-processing system according to claim 1, wherein the comprehensive treatment system (1) for the bottom slag and the fly ash further comprises a bottom slag crusher (1-4) and a sieving machine (1-5) which are sequentially communicated;
the furnace bottom slag crusher (1-4) is provided with a furnace bottom slag raw material inlet and a crushed material outlet;
the screening machine (1-5) is provided with a crushed material inlet, an oversize outlet and an undersize outlet, and the undersize outlet is communicated with a furnace bottom slag inlet of the mixing device (1-1); the oversize outlet is communicated with a furnace bottom slag raw material inlet of the furnace bottom slag crusher (1-4).
4. The coal-fired power plant solid waste and wastewater co-treatment system according to claim 3, wherein the screen mesh size of the screening machine (1-5) is 30-60 meshes.
5. The coal-fired power plant solid waste and wastewater co-processing system as claimed in claim 3, characterized in that a lifter (1-16) is arranged between the oversize outlet of the sieving machine (1-5) and the hearth slag raw material inlet of the hearth slag crusher (1-4).
6. The coal-fired power plant solid waste and wastewater co-processing system according to claim 1, wherein a second induced draft fan (5-2) is arranged between pipelines communicating the first residual steam outlet and the heat exchanger (4); a third induced draft fan (5-3) is arranged between the second residual steam outlet and the pipeline communicated with the heat exchanger (4); a fourth induced draft fan (5-4) is arranged between the cold air and the pipeline communicated with the cold air inlet; and a fifth induced draft fan (5-5) is arranged at the hot air outlet.
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| CN113008017A (en) * | 2021-04-23 | 2021-06-22 | 徐州无废城市技术研究院有限公司 | Coal-fired power plant solid waste and wastewater co-treatment system and method |
| CN114804484A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Coking wastewater crystallization separation device and process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008017A (en) * | 2021-04-23 | 2021-06-22 | 徐州无废城市技术研究院有限公司 | Coal-fired power plant solid waste and wastewater co-treatment system and method |
| CN113008017B (en) * | 2021-04-23 | 2023-12-26 | 徐州无废城市技术研究院有限公司 | Coal-fired power plant solid waste and wastewater cooperative treatment system and method |
| CN114804484A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Coking wastewater crystallization separation device and process |
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