CN112377924B - System and method for medium-temperature separation circulating fluidized bed boiler co-combustion of sludge - Google Patents
System and method for medium-temperature separation circulating fluidized bed boiler co-combustion of sludge Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a system and a method for medium temperature separation circulating fluidized bed boiler sludge blending combustion, wherein the system comprises a medium temperature separation cyclone separator and the like, and the method comprises the following steps: when the sludge is mixed and burned in the medium-temperature separation circulating fluidized bed boiler, the sludge is conveyed to a vertical feeder arranged above a corner flue of a central barrel of a medium-temperature separation cyclone separator through a pumping pipeline by a plunger pump, the vertical feeder cuts and scatters the agglomerated sludge and then enters the central barrel, the sludge sequentially passes through the central barrel, a barrel body and a cone from top to bottom, directly contacts with rising medium-temperature smoke gas to exchange heat in the movement process, under the action of turbulence, moisture in the sludge is rapidly evaporated, particles are contracted, collapsed and redispersed, the water content of the sludge is reduced to about 40%, then the sludge falls into an ash discharge port, and the sludge is mixed with circulating ash and then conveyed to a hearth of the circulating fluidized bed boiler through a material returning device to be burned. The invention reduces the water content of the sludge through the medium-temperature separation cyclone separator, and realizes the purpose of blending and burning the sludge on the medium-temperature separation fluidized bed boiler.
Description
Technical Field
The invention belongs to the technical field of coal-fired coupled sludge power generation, and particularly relates to a system and a method for medium-temperature separation circulating fluidized bed boiler sludge blending combustion.
Background
Along with the rapid improvement of the urbanization rate and the urbanization level in China, the urban sewage treatment capacity in China is continuously improved. By 2016, the total amount of national wastewater discharge is 711.10 hundred million t, the domestic sewage discharge accounts for 71.4 percent, and only 31 main urban domestic sewage discharge reaches 176.81 million. The urban domestic sewage treatment rate is 93.44%, and the sludge yield of main cities in China is about 4000 ten thousand tons based on 80% of water. Although the municipal sludge is rich in organic matters and various nutrient elements, the municipal sludge also contains a large amount of pathogenic bacteria, parasitic ova, heavy metals, polycyclic aromatic hydrocarbons and other toxic and harmful substances. The sludge treatment technology mainly comprises sludge drying, concentration and dehydration, anaerobic digestion, aerobic fermentation and the like, and the sludge disposal mode mainly comprises landfill, land utilization, building material utilization, incineration and the like.
At present, the sludge treatment technology in developed countries is relatively mature, and the legal system is also relatively perfect. Sludge disposal in european areas is gradually developed from land utilization and landfill to incineration, sludge disposal in north america has been mainly for agricultural use and incineration, and sludge disposal in japan is mainly for building material utilization after incineration due to land restriction.
The sludge treatment in cities and towns in China is mainly land landfill, and the landfill sites of all main cities are nearly saturated, so that the phenomenon of sludge enclosing the city is gradually formed. With the stricter urban environmental protection policy, the proportion of direct landfill treatment of urban sludge is gradually reduced. Meanwhile, most municipal industrial and domestic sewage share the same pipe network, so that the content of various heavy metals in the sludge is high, and the land utilization is limited. In contrast, sludge incineration can not only eliminate harmful substances, but also greatly reduce the volume of sludge, can realize harmless treatment of sludge, and is one of the most promising sludge disposal methods.
Municipal sludge, also called municipal sludge, mainly refers to sludge from sewage treatment plants, which is the largest amount of sludge, and mainly has the following characteristics:
1) the water content is high and can reach about 80 percent generally;
2) the content of microorganisms and pathogens is high;
3) the odor pollutes the environment;
4) contains heavy metals;
5) contains fine powder.
The characteristics of the sludge bring great difficulty to the harmless treatment of the sludge, but the sludge contains a plurality of organic matters and has certain utilization value. Generally, the sludge treatment should be carried out according to the principles of harmlessness, reduction and resource utilization, and the sludge incineration by the coal-fired unit coupling completely conforms to the principles.
The coal-fired unit coupled sludge power generation is used as a sludge incineration utilization form, has the unique advantages of high treatment capacity, strong adaptability, high system efficiency and the like, and has attracted extensive attention in recent years. The national energy agency proposes in 2017 that 'areas mainly based on landfill sites are selected preferentially to generate a cogeneration coal-electric machine set, and lay out technical improvement projects of coupling garbage and sludge power generation by burning coal, with the emphasis on 36 key cities such as direct prefectures, provincial cities, planned single-row cities and the like, large garbage and sludge generation amount and difficult land utilization or limited space', and 42 demonstration projects of coupling sludge power generation are approved for the first time.
The circulating fluidized bed CFB boiler has the advantages of wide fuel adaptability, low pollutant discharge, flexible operation and the like, and is widely applied at home and abroad. The CFB boiler is used for incinerating the sludge, the characteristic of wide fuel adaptability can be exerted, the heat value of the sludge is fully utilized, clean and stable green electric power or heat source is provided by combining with the existing facilities matched with a unit, and meanwhile, the environmental problem of 'sludge surrounding' is solved, so that the CFB boiler is a model of green circular economy, is favored by a plurality of power plants or other industrial enterprises matched with circulating fluidized bed boilers in recent years, and also becomes an important direction in the field of engineering application research.
For a conventional high-temperature separation circulating fluidized bed boiler, the sludge sent to a factory is conveyed to the top of the boiler through a pumping system in a top feeding mode and then enters a CFB boiler for incineration. The sludge enters a hearth from the top of the furnace in a free falling body mode, and the whole incineration process is completed according to the theoretical mechanism of agglomeration combustion. The sludge blending combustion proportion of the method can reach 5-10 percent generally;
in order to realize medium-temperature separation, a large number of heating surface tube bundles such as evaporation tubes, superheaters, high-temperature economizers and the like are arranged at the upper part of the hearth, and the residual space in the hearth is limited. When the sludge is mixed and burned, in order to avoid the sludge from being adhered to the heating surface tube bundle, the influence of water evaporation and heat absorption in the sludge on the temperature distribution of the upper space of the hearth is considered, and further the heat transfer and heat exchange of the convection heating surface are influenced, so that the sludge can not be fed from the top of the sludge furnace like a high-temperature separation circulating fluidized bed boiler, and the advantage of wide fuel adaptability of the circulating fluidized bed boiler is difficult to exert when the sludge is mixed and burned.
In view of the structural characteristics of the medium-temperature separation circulating fluidized bed boiler, engineering technicians provide practical experience for the reference of the mixed combustion of coal slime in the circulating fluidized bed boiler, and sludge from a pumping system is injected into the middle part of a hearth through a spray gun by adopting a feeding mode at the middle part of the hearth. The system layout of the middle feeding scheme is influenced by field conditions more and is difficult to arrange; the feeding point is generally arranged in the middle of the side wall, the width and depth of the hearth of the circulating fluidized bed boiler are greatly different, and if the feeding is inevitably more uniform on the side wall, the sludge distribution is seriously uneven, so that the running stability of the boiler is influenced; in addition, the mechanical failure of the spray gun in the middle feeding mode is high, and the later maintenance workload is large. Meanwhile, the water content of the sludge is 80 percent and is far higher than the water content of the coal slime by 30 percent, and the feeding material in the middle of the hearth is close to the bed layer, so that the stability of the bed temperature is greatly influenced. In summary, for the co-combustion of sludge, the middle feeding of the furnace is still not mature enough on the medium temperature separation circulating fluidized bed boiler.
Disclosure of Invention
The invention aims to overcome the defect that the existing sludge mixing burning technology of a circulating fluidized bed boiler is difficult to realize sludge mixing burning in a certain proportion on a medium-temperature separation circulating fluidized bed boiler, and provides a system and a method for sludge mixing burning of the medium-temperature separation circulating fluidized bed boiler.
The invention is realized by adopting the following technical scheme:
a system for blending and burning sludge in a medium-temperature separation circulating fluidized bed boiler comprises a plunger pump, a pumping pipeline, a vertical feeder, a medium-temperature separation cyclone separator, a material returning device and a circulating fluidized bed boiler hearth; the plunger pump is used for conveying sludge to a vertical feeder arranged above a corner flue of a central barrel of the medium-temperature separation cyclone separator through a pumping pipeline, the vertical feeder is used for cutting and scattering the agglomerated sludge and then feeding the agglomerated sludge into the central barrel, the sludge sequentially passes through the central barrel, a separator barrel and a separator cone from top to bottom, the water content of the sludge is reduced to about 40%, the sludge falls into an ash discharge port of the separator and is mixed with circulating ash and then conveyed to a hearth of the circulating fluidized bed boiler through a material returning device for combustion.
The invention is further improved in that the water content of the sludge is 80%.
The invention is further improved in that the upper part of the hearth of the circulating fluidized bed boiler is sequentially provided with an evaporator, a superheater and a high-temperature economizer from bottom to top.
The further improvement of the invention is that the circulating fluidized bed boiler adopts a medium temperature separation mode, and the temperature of medium temperature flue gas is 500-650 ℃.
A method for mixing and burning sludge in a medium-temperature separation circulating fluidized bed boiler is based on the system for mixing and burning sludge in the medium-temperature separation circulating fluidized bed boiler, and comprises the following steps: when the sludge is mixed and burned in the medium-temperature separation circulating fluidized bed boiler, the sludge is conveyed to a vertical feeder arranged above a corner flue of a central barrel of a medium-temperature separation cyclone separator through a pumping pipeline by a plunger pump, the vertical feeder cuts and scatters the agglomerated sludge and then enters the central barrel, the sludge sequentially passes through the central barrel, a separator barrel and a separator cone from top to bottom, directly contacts with the rising medium-temperature flue gas to exchange heat in the movement process, under the action of strong turbulence, moisture in the sludge is rapidly evaporated, particles are contracted, collapsed and redispersed, the water content of the sludge is reduced to about 40%, the sludge falls into an ash discharge port of the separator, and the sludge is mixed with circulating ash and then conveyed to a hearth of the circulating fluidized bed boiler through a material returning device to be burned.
The invention has the further improvement that the vertical feeder cuts and breaks up the agglomerated sludge in a spiral feeding mode and then enters the central cylinder.
The invention has at least the following beneficial technical effects:
the invention provides a system and a method for blending and burning sludge in a medium-temperature separation circulating fluidized bed boiler, wherein a plunger pump is adopted to convey the sludge to a vertical feeder arranged above a central cylinder corner flue of a medium-temperature separation cyclone separator through a pumping pipeline, the conveying mode is simple and reliable, continuous conveying can be realized, and a pump body and the pipeline are in a sealed state, so that no odor is leaked, and no adverse effect is caused on the environment. The vertical feeder feeds the medium-temperature separation cyclone separator in a spiral feeding mode, and the spiral fins of the feeder can cut and scatter the agglomerated sludge, so that excessive agglomeration of the sludge can be effectively prevented, and meanwhile, the front-section drying process of the sludge after entering the central cylinder is facilitated. After entering a cyclone separator, sludge sequentially passes through a central cylinder, a separator cylinder and a separator cone from top to bottom, directly contacts with rising medium-temperature flue gas (the temperature is 500-650 ℃) for heat exchange in the movement process, the sludge and the flue gas move in reverse directions and are lifted by the rising flue gas, the contact time of the sludge and the flue gas in the cyclone separator is longer, meanwhile, as the movement track of air flow in the cyclone separator is spiral, the turbulence degree of the air flow is stronger, under the action of strong turbulence, moisture in the sludge is rapidly evaporated, particles are contracted, collapsed and redispersed, the moisture content of the sludge is reduced to about 40%, the physical property is changed from an agglomeration state to a dispersion state, and finally the sludge falls into an ash discharge port of the cyclone separator and is conveyed to a boiler hearth of a circulating fluidized bed for combustion through a material returning device, and as the moisture content of the sludge fed into a hearth bed layer is about 40%, the sludge is equivalent to lignite, the influence on the combustion in the furnace is small, and particularly for the circulating fluidized bed boiler burning brown coal, the influence on the bed combustion is hardly caused. The wet flue gas enters the tail flue through the central cylinder, and finally the standard emission is realized by using environmental protection facilities such as denitration, dust removal, desulfurization and the like which are equipped in the boiler, so that the existing facilities are utilized to the maximum extent, and better environmental protection benefit is realized on the basis of reducing the environmental protection cost.
Compared with the existing sludge mixed combustion technology, the invention adopts a mode of feeding by the central cylinder of the cyclone separator, well solves the problem that the traditional medium-temperature separation circulating fluidized bed boiler is difficult to carry out sludge mixed combustion, skillfully avoids a large number of evaporation and overheating heating surface tube bundles arranged at the upper part of a hearth, avoids sludge from being adhered to the heating surface tube bundles, also prevents the influence of moisture evaporation and heat absorption in the sludge on the temperature distribution of the upper space of the hearth, further influences the heat transfer and heat exchange to a convection heating surface, and simultaneously carries out countercurrent heat exchange by utilizing high-turbulence smoke rising spirally in the separator and the sludge, realizes the drying of the sludge before entering the boiler, and reduces the influence of the mixed combustion sludge on the combustion in the boiler; the dried sludge (with the water content of 40 percent) is sent into the hearth through the material returning device, so that the influence on bed parameters is reduced to the maximum extent. The method is characterized in that medium-temperature flue gas with high turbulence (the temperature is 500-650 ℃) in a cyclone separator is utilized to complete the transformation process before the sludge enters a furnace, the water content of the sludge is reduced to about 40%, the physical properties are changed from an agglomeration state to a dispersion state, and the sludge is returned to the furnace for combustion through a material returning device.
Drawings
FIG. 1 is a schematic diagram of a system and a method for sludge co-combustion in a medium temperature separation circulating fluidized bed boiler according to the present invention.
The notation in the figure is:
the device comprises a plunger pump 1, a pumping pipeline 2, a vertical feeder 3, a medium-temperature separation cyclone separator 4, a central cylinder 5, a separator cylinder 6, a separator cone 7, a separator ash discharge port 8, a material returning device 9, a circulating fluidized bed boiler hearth 10, an evaporator 11, a superheater 12 and a high-temperature economizer 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the system for co-combusting sludge in the medium temperature separation circulating fluidized bed boiler provided by the invention comprises a plunger pump 1, a pumping pipeline 2, a vertical feeder 3, a medium temperature separation cyclone separator 4, a material returning device 9 and a circulating fluidized bed boiler hearth 10. The medium-temperature separation cyclone separator 4 comprises a central cylinder 5, a separator cylinder 6, a separator cone 7 and a separator ash discharge port 8, the circulating fluidized bed boiler is a medium-temperature separation circulating bed boiler, and an evaporator 11, a superheater 12 and a high-temperature economizer 13 are sequentially arranged on the upper part of a hearth 10 of the circulating fluidized bed boiler from bottom to top. Sludge from the bin is sucked from an inlet of the plunger pump 2, is pressurized by a reciprocating piston and then enters the vertical feeder 3 arranged at the top of the medium temperature separation cyclone separator 4 through the pumping pipeline 2, and then is fed into the central cylinder 5 of the separator through the vertical feeder 3. The sludge directly contacts with rising medium-temperature flue gas (the temperature is 500-650 ℃) for heat exchange in the falling process, sequentially passes through the central cylinder 5, the separator cylinder 6 and the separator cone 7 from top to bottom, is dried under the action of the flue gas, falls into the ash discharge port 8 of the separator after the moisture content of the sludge is reduced to about 40%, and is conveyed to the hearth 10 of the circulating fluidized bed boiler through the material returning device 9 for combustion.
The invention provides a method for co-firing sludge in a medium-temperature separation circulating fluidized bed boiler, which comprises the following steps of: when the medium temperature separation circulating fluidized bed boiler is used for blending and burning sludge, the sludge is conveyed to a vertical feeder 3 arranged above a corner flue of a central cylinder 5 of a medium temperature separation cyclone separator 4 through a plunger pump 1, the vertical feeder 3 cuts and scatters the agglomerated sludge in a spiral feeding mode and then enters the central cylinder, the sludge sequentially passes through the central cylinder 5, a separator cylinder 6 and a separator cone 7 from top to bottom, the sludge directly contacts with rising medium temperature flue gas (the temperature is 500-650 ℃) to exchange heat in the movement process, under the action of strong turbulence, moisture in the sludge is rapidly evaporated, particles are contracted, collapsed and redispersed, the moisture content of the sludge is reduced to about 40%, then the sludge falls into a separator ash discharge port 8, and the sludge is mixed with circulating ash and then conveyed to a circulating fluidized bed boiler hearth 10 through a material returning device 9 to be combusted.
The sludge is conveyed to the vertical feeder 3 arranged above the corner flue of the central cylinder 5 of the medium temperature separation cyclone separator 4 through the plunger pump 1 through the pumping pipeline 2, the conveying mode is simple and reliable, the continuous conveying can be realized, the pump body and the pipeline are both in a sealed state, no odor is leaked, and no adverse effect is caused to the environment. The vertical feeder 3 feeds the medium-temperature separation cyclone separator 4 in a spiral feeding mode, and the spiral fins of the feeder can cut and scatter the agglomerated sludge, so that excessive agglomeration of the sludge can be effectively prevented, and meanwhile, the front-section drying process of the sludge after entering the central cylinder is facilitated. After entering the cyclone separator 4, the sludge sequentially passes through the central cylinder 5, the separator cylinder 6 and the separator cone 7 from top to bottom, directly contacts with and exchanges heat with rising medium-temperature flue gas (the temperature is 500-650 ℃) in the movement process, the sludge and the flue gas move reversely and are subjected to the lifting action of the rising flue gas, the contact time of the sludge and the flue gas in the cyclone separator 4 is longer, meanwhile, as the movement track of the air flow in the cyclone separator 4 is spiral, the turbulence degree of the air flow is stronger, under the action of strong turbulence, moisture in the sludge is rapidly evaporated, particles are contracted, collapsed and redispersed, the moisture content of the sludge is reduced to about 40%, the physical property is changed from an agglomeration state to a dispersion state, and finally the sludge falls into the separator ash discharge port 8 and is conveyed to the circulating fluidized bed boiler hearth 10 for combustion through the material return device 9, and as the moisture content of the sludge conveyed to a hearth bed layer is about 40%, compared with lignite, the lignite has little influence on combustion in the furnace, and particularly has little adverse influence on bed combustion in the circulating fluidized bed boiler burning lignite. The wet flue gas enters the tail flue through the central cylinder 5, and finally the standard emission is realized by using environmental protection facilities such as denitration, dust removal, desulfurization and the like which are equipped in the boiler, so that the existing facilities are utilized to the maximum extent, and better environmental protection benefit is realized on the basis of reducing the environmental protection cost.
In the invention, the sludge is sucked into the plunger pump from the storage bin, the water content is usually about 80%, the sludge enters the vertical feeder at the top of the separator after being pressurized and is fed into the central cylinder by the vertical feeder. The sludge meets the high-turbulence flue gas (the temperature is 500-650 ℃) in the falling motion process of the central cylinder and moves reversely, so that extremely strong convective heat transfer is realized, the heat transfer coefficient is greatly improved, and the sludge can complete the evaporation process of partial moisture in a short time and in a short stroke.
The invention fully considers the structural characteristics of the medium-temperature separation circulating fluidized bed, and more heating surface tube bundles are arranged at the upper part of the hearth. The central cylinder feeding mode of the separator is adopted, so that the sludge is prevented from adhering to the heating surface tube bundle and the influence on heat transfer and heat exchange of the heating surface is avoided, and the problem of sludge mixed burning of the medium-temperature separation circulating fluidized bed boiler is solved.
In conclusion, the invention skillfully avoids a large amount of evaporation and overheating heating surface tube bundles arranged at the upper part of the hearth by a feeding mode of the central cylinder of the separator, prevents sludge from being adhered to the heating surface tube bundles, also prevents the influence of evaporation and heat absorption of moisture in the sludge on the temperature distribution of the upper space of the hearth, further influences the heat transfer and heat exchange of a convection heating surface, and simultaneously utilizes high-turbulence smoke rising spirally in the separator to perform countercurrent heat exchange with the sludge, realizes the drying of the sludge before entering the furnace and reduces the influence of sludge mixed with combustion in the furnace; the dry sludge (with the water content of 40%) is fed into the hearth through the material returning device, the influence on bed parameters is reduced to the maximum extent, meanwhile, wet flue gas is carried to enter the tail flue through the central cylinder, and finally, the standard emission is realized by using environmental protection facilities such as denitration, dust removal and desulfurization which are equipped in the boiler, the existing facilities are utilized to the maximum extent, and better environmental protection benefit is realized on the basis of reducing the environmental protection cost. The medium-temperature separation circulating fluidized bed boiler has the advantages of less modification work amount, simple system arrangement, realization of mixed combustion of sludge in a considerable proportion, low production and operation cost and realization of considerable economic benefits.
Claims (8)
1. The system for the sludge co-combustion of the medium-temperature separation circulating fluidized bed boiler is characterized by comprising a plunger pump (1), a pumping pipeline (2), a vertical feeder (3), a medium-temperature separation cyclone separator (4), a material returning device (9) and a circulating fluidized bed boiler furnace (10); wherein,
plunger pump (1) is used for carrying mud to vertical batcher (3) of setting in middle temperature separation cyclone (4) center section of thick bamboo (5) corner flue top through pumping pipeline (2), vertical batcher (3) are used for cutting the reunion mud, get into center section of thick bamboo (5) after breaking up, mud top-down passes through center section of thick bamboo (5), separator barrel (6), separator cone (7) in proper order, fall into separator ash discharge mouth (8) after the mud moisture content drops to about 40%, mix with the circulation ash after through returning charge device (9) carry to circulating fluidized bed boiler furnace (10) and burn.
2. The system for middle-temperature separation circulating fluidized bed boiler co-combustion of sludge as claimed in claim 1, wherein the water content of the sludge is 80%.
3. The system for middle-temperature separation of sludge blended in a circulating fluidized bed boiler according to claim 1, wherein an evaporator (11), a superheater (12) and a high-temperature economizer (13) are sequentially arranged on the upper part of the circulating fluidized bed boiler furnace (10) from bottom to top.
4. The system for moderate temperature separation of sludge mixed in a circulating fluidized bed boiler according to claim 1, wherein the circulating fluidized bed boiler adopts a moderate temperature separation mode.
5. The system for middle-temperature separation of sludge blended in a circulating fluidized bed boiler according to claim 4, wherein the temperature of the middle-temperature flue gas is 500-650 ℃.
6. A method for middle-temperature separation of sludge mixed with a circulating fluidized bed boiler is characterized in that the method is based on the system for middle-temperature separation of sludge mixed with a circulating fluidized bed boiler in any one of claims 1 to 5, and comprises the following steps: when the medium-temperature separation circulating fluidized bed boiler is used for mixing and burning sludge, the sludge is conveyed to a vertical feeder (3) arranged above a corner flue of a central cylinder (5) of a medium-temperature separation cyclone separator (4) through a plunger pump (1), the agglomerated sludge is cut and scattered by the vertical feeder (3) and then enters the central cylinder (5), the sludge sequentially passes through the central cylinder (5), a separator cylinder body (6) and a separator cone (7) from top to bottom, the sludge is directly contacted with rising medium-temperature flue gas in the movement process for heat exchange, under the action of strong turbulence, moisture in the sludge is rapidly evaporated, particles shrink, collapse and redisperse, the moisture content of the sludge falls into a separator ash discharge port (8) after the moisture content of the sludge is reduced to a set value, and the sludge is mixed with circulating ash and then conveyed to a circulating fluidized bed boiler hearth (10) through a material returning device (9) for combustion.
7. The method for middle-temperature separation of the sludge blended in the circulating fluidized bed boiler according to claim 6, wherein the vertical feeder (3) cuts and breaks up the agglomerated sludge in a spiral feeding manner and then enters the central cylinder (5).
8. A method for middle temperature separation of mixed burning sludge of circulating fluidized bed boiler according to claim 6, characterized in that the water content of the sludge is reduced to 40% and then falls into the ash discharge port (8) of the separator.
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| WO2014128357A1 (en) * | 2013-02-22 | 2014-08-28 | Endev Oy | Method and apparatus for combustion of sludge |
| CN203866216U (en) * | 2014-04-22 | 2014-10-08 | 云南民族大学 | Circulating fluidized bed reaction device for preparing fused calcium-magnesium phosphate fertilizer |
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Patent Citations (8)
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| GB1339492A (en) * | 1970-01-10 | 1973-12-05 | Keller Peukert Gmbh | Drying of sewage sludge |
| JP2000074564A (en) * | 1998-09-01 | 2000-03-14 | Ishikawajima Harima Heavy Ind Co Ltd | Sludge substance drying device |
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