CN115717704A - Sludge drying slurrying fluidized bed coupling combustion system - Google Patents
Sludge drying slurrying fluidized bed coupling combustion system Download PDFInfo
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- CN115717704A CN115717704A CN202211360858.XA CN202211360858A CN115717704A CN 115717704 A CN115717704 A CN 115717704A CN 202211360858 A CN202211360858 A CN 202211360858A CN 115717704 A CN115717704 A CN 115717704A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a sludge drying pulping fluidized bed coupled combustion system, which comprises the following components in sequential connection: the system comprises a sludge drying and dehydrating unit, a pulping and slurry supplying unit, a boiler combustion unit and a flue gas treatment unit, wherein the sludge drying and dehydrating unit is used for drying and dehydrating wet sludge raw materials; the pulping and slurry supplying unit is used for finishing pulping of sludge coal coke slurry of the dried sludge and supplying slurry to the boiler combustion unit; the boiler combustion unit is used for burning the sludge coal coke slurry; the flue gas treatment unit is used for cleaning flue gas generated by the boiler combustion unit. By the structural arrangement of the invention, the system has lower requirement on the sludge drying degree, can fully utilize the heat value of the sludge and the wastewater to prepare the sludge coal coke slurry with stable heat value, and adopts the sludge coal coke slurry circulating fluidized bed boiler for clean burning, thereby fully utilizing the heat value of the sludge and effectively reducing the sludge treatment cost.
Description
Technical Field
The invention belongs to the technical field of dried sludge incineration, and particularly relates to a sludge drying pulping fluidized bed coupled combustion system.
Background
The transformation and upgrading of the energy structure is realized by pressing an 'acceleration key', and the state of excess capacity in the coal and electricity industry becomes more obvious along with the acceleration of energy supply transformation. With the rapid development of the urbanization process, the sewage treatment capacity will be continuously increased, and the situation of sludge enclosing cities is increasingly serious due to the limited sewage treatment capacity of short-plate byproduct sludge. How to organically combine the coal-electricity industry with sludge treatment, the environmental protection problem of the city can be solved while the coal-fired power plant assets around the city are worked, the promotion of the carbon emission reduction target is bidirectionally promoted, the method is a win-win choice, and the market prospect is wide.
The sludge enriches a large amount of organic matters, pollutants and nutrient substances in the sewage, and has dual attributes of pollution and resources. The sludge coupling combustion technology mixes the dried sludge with coal for power generation, fully utilizes the heat value of the sludge, effectively reduces the sludge treatment cost, and is an effective treatment method for stabilizing, reducing, harmlessly and recycling the sludge. A great deal of research and practice has been carried out on the sludge coupling combustion technology by a plurality of scientific research institutions and organizations, a plurality of sludge drying devices are developed, and municipal sludge coupling power generation demonstration is implemented in a plurality of projects. The sludge has high water content (80 percent), low heat value, is rich in gravel and organic substances and the like, and the coupled combustion still exists at present: high requirement on drying degree, high energy consumption, low blending combustion rate and the like. The efficient and low-consumption deep dehydration technology still needs to be further developed, the energy consumption of sludge drying is reduced, a large proportion of sludge with high water content is explored, and the process design rationality and the overall intelligent integration level are improved.
Aiming at sludge drying coupled co-combustion, different patents are put forward by different units to realize resource utilization of sludge. For example, patent publication No. CN108083607A proposes a system and method for sludge drying coupled coal-fired power generation by primary sludge dewatering, indirect drying, mixing with raw coal, grinding, and then feeding into a coal-fired boiler for coupled combustion, wherein wet sludge with a water content of more than 80% is dewatered and dried step by step until the water content is lower than 15%, and then the wet sludge is mixed with raw coal.
The patent publication No. CN111256153A provides a sludge drying direct-feeding co-combustion system suitable for a circulating fluidized bed boiler, which dries wet sludge with the water content of 70-85% and directly feeds the wet sludge into a furnace for co-combustion after the water content is reduced to 50-65%.
The patent publication No. CN110963668A provides an overheat steam drying sludge incineration device with a preheating function, the overheat steam drying sludge is adopted, the specific energy consumption of drying is lower than that of hot air drying, the patent independently converts the specific energy consumption of sludge drying into a certain energy-saving effect, but the energy-saving effect is not obvious due to comprehensive water treatment energy consumption, and meanwhile, the waste of high-quality steam is not considered.
The patent publication No. CN110606648A provides a system for carrying out filter pressing dehydration through a plate frame and adopting a fluidized bed furnace for incineration after a steam dryer is dried, and although the patent idea has certain novelty, the system structure is complex, and the problems of high-quality steam loss, high requirement on drying degree and the like exist.
The patent with publication number CN113531548A provides a combustion system of a pure-combustion sludge circulating fluidized bed boiler, the sludge used for combustion of the fluidized bed boiler provided by the patent is dried sludge, the front-end sludge drying treatment is not considered, and the sludge treatment capacity is still limited by the sludge drying pretreatment process. Patent publication No. CN11256154A/CN112174483A/CN211688800A proposes the idea of coupling sludge drying with mixed combustion power generation by using hot flue gas of a thermal power plant, and has the problems of high drying degree requirement, high energy consumption, low mixed combustion proportion and the like.
In the prior art, the system is too complex, and the implementation difficulty is high; or the requirement on drying degree is high, and the energy consumption is high; or the mixed combustion proportion is low, the problems of high-quality steam resource waste and the like exist, and the low-energy consumption, large-proportion and batch mixed combustion treatment of the sludge cannot be thoroughly realized.
Disclosure of Invention
The invention aims to: in order to overcome the problems of the prior art, the invention discloses a sludge drying pulping fluidized bed coupled combustion system, which has the advantages that the requirement on the sludge drying degree is lower through the structural arrangement of the sludge drying pulping fluidized bed coupled combustion system, the heat value and the waste water of the sludge can be fully utilized, the sludge coal coke slurry with stable heat value is prepared, and the sludge coal coke slurry circulating fluidized bed boiler is adopted for clean burning, so that the heat value of the sludge is fully utilized, the sludge treatment cost is effectively reduced, and the sludge can be treated in batches, thereby being an effective treatment method for stabilizing, reducing, harmlessly recycling the sludge.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a sludge drying slurrying fluidized bed coupling combustion system, coupling combustion system is including connecting gradually: the system comprises a sludge drying and dehydrating unit, a pulping and slurry supplying unit, a boiler combustion unit and a flue gas treatment unit, wherein the sludge drying and dehydrating unit is used for drying and dehydrating wet sludge raw materials; the pulping and slurry supplying unit is used for finishing pulping of sludge coal coke slurry of the dried sludge and supplying slurry to the boiler combustion unit; the boiler combustion unit is used for burning the sludge coal coke slurry; the flue gas treatment unit is used for cleaning the flue gas generated by the boiler combustion unit.
According to a preferred embodiment, the sludge drying and dewatering unit comprises: the sludge drying device comprises a sludge pool, a sludge conveyer, a sludge dryer and a dry sludge conveyer, wherein the sludge pool is connected with the sludge dryer through the sludge conveyer, the sludge dryer is used for completing the drying treatment of wet sludge, and the sludge dryer is communicated with a pulping and slurry supplying unit through the dry sludge conveyer.
According to a preferred embodiment, the pulp supply unit comprises: the device comprises a water storage tank, a medicament pool, a coal storage bin, a petroleum coke bin, a feeding machine, a grinding machine, a slurry filter, a sludge coal coke slurry conveyor and a slurry storage tank; the water storage tank, the medicament pool, the coal storage bin and the petroleum coke bin are respectively connected with a feeding machine, the feeding machine is connected with a grinding machine, the discharge end of the dry sludge conveyor is connected with the grinding machine, and the fully grinding and mixing of the dried sludge, the coal and the petroleum coke are completed through the grinding machine to prepare sludge-coal-coke slurry; the grinder is connected with a slurry storage tank through a slurry filter and a sludge coal coke slurry conveyor in sequence, and the slurry storage tank is connected with a boiler combustion unit through a boiler front slurry supply system.
According to a preferred embodiment, the stokehole slurry supply system adopts a screw pump to pump the sludge coal coke slurry, and adopts a granulator to granulate the sludge coal coke slurry after the sludge coal coke slurry is pumped to a feed port of a fluidized bed of a boiler combustion unit.
According to a preferred embodiment, the slurry filter is also connected with a sludge tank, and the sludge filtered by the slurry filter is sent to the sludge tank for secondary drying and is ground by the grinder for the second time; and a slurry stirrer for homogenizing the slurry is arranged on the slurry storage tank.
According to a preferred embodiment, the boiler combustion unit comprises: the system comprises a circulating fluidized bed boiler, a cyclone separator, a tail flue and an air preheater, wherein the bottom end of the circulating fluidized bed boiler is connected with a stokehole slurry supply system and is used for receiving granulated sludge coal coke slurry; the cyclone separator is arranged at the downstream of the circulating fluidized bed boiler, and a material returning device is arranged at the bottom ash particle outlet end of the cyclone separator and connected with the material supply end of the circulating fluidized bed boiler; one end of the tail flue is connected with the top end of the cyclone separator, and the other end of the tail flue is connected with the flue gas treatment unit.
According to a preferred embodiment, a plurality of air preheaters are arranged in the tail flue, and preheated air is introduced into the circulating fluidized bed boiler and the sludge dryer.
According to a preferred embodiment, a plurality of air preheaters are arranged in the tail flue, and preheated air is introduced into the circulating fluidized bed boiler; and the tail flue is communicated with the sludge dryer through a flue gas recirculation system, and the sludge drying treatment in the tail flue is completed by introducing flue gas into the sludge dryer.
According to a preferred embodiment, the circulating fluidized bed boiler is provided with a primary air supply port, a first layer secondary air supply port, a second layer secondary air supply port and a third layer secondary air supply port from the bottom to the top in sequence, and the air preheater supplies air to the primary air supply port through a primary air system; the air preheater supplies air to the first layer secondary air supply port and the second layer secondary air supply port through a secondary air system; the sludge dryer is communicated with the third layer of secondary air supply port through a flue gas pipeline and is used for introducing the clown gas generated by the sludge dryer into the circulating fluidized bed boiler for incineration treatment.
According to a preferred embodiment, the flue gas treatment unit comprises, connected in series: the boiler comprises a dust remover, an induced draft fan, a desulfurization system and a chimney, wherein the smoke outlet of a boiler combustion unit is connected with the air inlet end of the dust remover.
The working principle or the process of the sludge drying pulping fluidized bed coupling combustion system is as follows:
1) Wet sludge raw materials are kept stand and deposited in a sludge tank, a sludge conveyor is used for conveying the wet sludge raw materials to a sludge dryer after a small amount of water is removed, the sludge is dried by the sludge dryer through preheated air or recirculated hot flue gas, and all low-temperature wet and odorous flue gas generated in the drying process is introduced into a circulating fluidized bed boiler for combustion treatment.
2) The method comprises the steps of feeding dried sludge, petroleum coke, raw coal and an additive into a grinding machine, grinding and mixing the sludge, the petroleum coke and the raw coal by the grinding machine, enabling water in the sludge to be diluted as far as possible under the action of the additive, grinding uniform and stable sludge coke slurry, filtering the ground and mixed sludge coke slurry by a slurry filter, removing slurry slag with unqualified particle size, pumping the slurry into a slurry storage tank by a sludge coke slurry conveyor for storage, continuously stirring and mixing by a slurry stirrer in the storage process, preventing the slurry from being deposited and layered, and after a circulating fluidized bed boiler runs, pumping and granulating by a slurry supply system in front of the boiler, and uniformly spraying the slurry into a hearth.
3) After the circulating fluidized bed boiler is started to operate, the sludge coal coke slurry is uniformly sprayed into the boiler after being granulated, is agglomerated, mixed and combusted in a grading way under the combined action of primary/secondary air of the circulating fluidized bed boiler and high-temperature materials in the boiler, particles which are not completely combusted are separated by a cyclone separator, and are returned to a hearth by a material returning device to realize circulating combustion. High-temperature flue gas generated by combustion is subjected to heat exchange and utilization through an air preheater arranged in the tail flue. After the primary/secondary cold air is preheated by the air preheater, part of the primary/secondary cold air is introduced into a primary/secondary air system, so that the normal operation air quantity of the sludge coal coke slurry fluidized bed boiler is met; the rest part is sent into a sludge dryer through a bypass drying hot air pipeline to dry wet sludge, and all low-temperature wet and odorous flue gas generated in the drying process is subjected to secondary air combustion treatment through a third layer; or the flue gas recirculation system introduces the high-temperature flue gas in the tail flue into the sludge dryer to dry the wet sludge.
4) The low-temperature flue gas after heat exchange is sent into a tail flue gas treatment unit, is dedusted by a deduster in sequence, and is discharged after being desulfurized by a desulfurization system and lifted by a chimney.
The aforementioned main aspects of the invention and their respective further alternatives may be freely combined to form a plurality of aspects, all of which are aspects that may be adopted and claimed by the present invention. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that:
the invention relates to a sludge drying pulping fluidized bed coupling combustion system, which adopts the technical scheme of predrying, pulping and fluidized bed combustion, integrates drying, pulping and combustion, can improve the mixing amount of sludge by reducing the water content of the sludge through hot primary/secondary air of a fluidized bed boiler or recycled hot flue gas, can fully utilize the water in the sludge through pulping, and can greatly reduce the drying degree requirement and reduce the drying energy consumption through combustion of a sludge coal slurry fluidized bed boiler. Wet and odorous flue gas generated by drying sludge is sprayed into the hearth through the third layer of secondary air of the fluidized bed boiler, the combustible gas is fully combusted in the furnace, and then is discharged from a chimney after flue gas treatment such as dust removal, desulfurization and the like, so that the environmental pollution can be reduced.
Furthermore, the sludge coal coke slurry circulating fluidized bed boiler has advanced and reliable technology, and can realize large-scale development and greatly improve the sludge treatment capacity.
Furthermore, the sludge coal coke slurry is prepared by mixing high-heat-value petroleum coke, so that the mixing proportion of coal powder can be reduced, and the mixing proportion of sludge can be improved. And part of petroleum coke can be reasonably utilized while sludge is treated.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a sludge drying and pulping fluidized bed coupled combustion system of the invention;
FIG. 2 is a schematic structural diagram of another embodiment of the sludge drying pulping fluidized bed coupled combustion system of the present invention;
wherein, 1-a sludge pond, 2-a sludge conveyor, 3-a sludge dryer, 4-a dry sludge conveyor, 5-a water storage tank, 6-a medicament pond, 7-a coal storage bin, 8-a petroleum coke bin, 9-a feeder, 10-a grinder, 11-a slurry filter, 12-a sludge coal coke slurry conveyor, 13-a slurry storage tank, 14-a slurry stirrer, 15-a stokehole slurry supply system, 16-a circulating fluidized bed boiler, 17-a cyclone separator, 18-a material return device, 19-a primary air system, 20-a secondary air system, 21-a drying hot air pipeline, 22-a flue gas pipeline, 23-a third layer of secondary air, 24-a tail flue, 25-an air preheater, 26-a dust remover, 27-an induced draft fan, 28-a desulfurization system, 29-a chimney and 30-a flue gas recirculation system.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, it should be noted that, in the present invention, if the specific structures, connection relationships, position relationships, power source relationships, and the like are not written in particular, the structures, connection relationships, position relationships, power source relationships, and the like related to the present invention can be known by those skilled in the art without creative work on the basis of the prior art.
Example 1:
referring to fig. 1, the embodiment discloses a coupled combustion system of a sludge drying pulping fluidized bed, which includes: the system comprises a sludge drying and dehydrating unit, a pulping and slurry supplying unit, a boiler combustion unit and a flue gas treatment unit.
The sludge drying and dehydrating unit is used for drying and dehydrating wet sludge raw materials; the pulping and slurry supplying unit is used for finishing pulping of sludge coal coke slurry of the dried sludge and supplying slurry to the boiler combustion unit; the boiler combustion unit is used for burning the sludge coal coke slurry; the flue gas treatment unit is used for cleaning the flue gas generated by the boiler combustion unit.
Preferably, the sludge drying and dewatering unit comprises: a sludge pool 1, a sludge conveyer 2, a sludge dryer 3 and a dry sludge conveyer 4.
The sludge tank 1 is connected with a sludge dryer 3 through a sludge conveyor 2, the drying treatment of wet sludge is completed through the sludge dryer 3, and the sludge dryer 3 is communicated with a pulping and slurry supply unit through a dry sludge conveyor 42.
Wherein, the sludge dryer 3 can adopt a disc type dryer or a thin layer dryer. After being dried by the sludge dryer 3, the moisture of the original wet sludge is reduced from 80-95% to 65-70%, the dried and dehydrated sludge is conveyed to a downstream pulping process by the dry sludge conveyor 4, and low-temperature wet flue gas generated by drying is conveyed to the third layer of secondary air supply port 23 of the circulating fluidized bed boiler 16 through a wet flue gas pipeline for incineration treatment.
Preferably, the pulping and pulp-supplying unit comprises: a water storage tank 5, a medicament pool 6, a coal storage bin 7, a petroleum coke bin 8, a feeder 9, a grinder 10, a slurry filter 11, a sludge coal coke slurry conveyor 12 and a slurry storage tank 13.
The water storage tank 5, the medicament tank 6, the coal storage bin 7 and the petroleum coke bin 8 are respectively connected with the feeding machine 9, the feeding machine 9 is connected with the grinding machine 10, the discharge end of the dry sludge conveyor 42 is connected with the grinding machine 10, a sludge blending agent, a sludge coal coke slurry additive and the like are prepared in the medicament tank 6, the diluted sludge blending agent, the sludge coal coke slurry additive and the like are conveyed to the grinding machine 10 through a pipeline, the sludge, coal and petroleum coke are fully ground and mixed through the grinding machine 10, under the combined action of the additive, moisture in the sludge is separated out as much as possible, and meanwhile, the uniformity and the stability of the sludge coal coke slurry are improved.
The grinder 10 is connected with a slurry storage tank 13 through a slurry filter 11 and a sludge coal coke slurry conveyor 12 in sequence, and the slurry storage tank 13 is connected with a boiler combustion unit through a boiler front slurry supply system 15.
The stokehole slurry supply system 15 pumps the sludge coal coke slurry by adopting a screw pump, and after the sludge coal coke slurry is pumped to a fluidized bed feeding port of a boiler combustion unit, the sludge coal coke slurry is granulated by adopting a granulator. The slurry filter 11 is also connected with the sludge tank 1 and is used for conveying the sludge filtered by the slurry filter 11 to the sludge tank 1 for secondary drying and grinding by the grinder 10 for secondary grinding; the slurry storage tank 13 is provided with a slurry stirrer 14 for homogenizing the slurry.
Specifically, the sludge coal coke slurry after being fully ground and mixed is filtered by a slurry filter 11, and the particle diameter d of the sludge coal coke slurry is controlled 50 And (3) feeding a small amount of filtered coarse slurry particles into a sludge pool 1 at a particle size of about 50 micrometers, grinding and crushing the coarse slurry particles along with the sludge in the pool for the second time, pumping the sludge coal tar slurry with qualified particle size into a slurry storage tank 13 through a sludge coal tar slurry conveyor 12, storing the sludge coal tar slurry, installing a slurry stirrer 14 in the slurry storage tank 13, continuously rotating the slurry stirrer 14 to stir the slurry, further mixing the sludge coal tar slurry, improving the uniformity of the sludge coal tar slurry and preventing the slurry from settling and layering.
And a slurry outlet at the bottom of the slurry storage tank 13 is connected with a boiler front slurry supply system 15, after the boiler operates, the sludge coal coke slurry stored in the slurry storage tank 13 is pumped by a screw pump arranged in the boiler front slurry supply system 15, is sent to a feed inlet of a circulating fluidized bed boiler 16, is granulated by a granulator and is uniformly sprayed into the circulating fluidized bed boiler 16.
Preferably, the boiler combustion unit comprises: the system comprises a circulating fluidized bed boiler 16, a cyclone separator 17, a tail flue 24 and an air preheater 25, wherein the bottom end of the circulating fluidized bed boiler 16 is connected with a front-furnace slurry supply system and is used for receiving granulated sludge coal coke slurry.
The cyclone separator 17 is arranged at the downstream of the circulating fluidized bed boiler 16, a material returning device 18 is arranged at the bottom ash particle outlet end of the cyclone separator 17, and the material returning device 18 is connected with the material supply end of the circulating fluidized bed boiler 16; one end of the tail flue 24 is connected with the top end of the cyclone separator 17, and the other end is connected with the flue gas treatment unit.
Preferably, a plurality of air preheaters 25 are arranged in the tail flue 24, and preheated air is introduced into the circulating fluidized bed boiler 16 and the sludge dryer 3 for realizing the drying treatment of wet sludge.
The circulating fluidized bed boiler 16 is provided with a primary air supply port, a first layer secondary air supply port, a second layer secondary air supply port and a third layer secondary air supply port from the bottom to the top in sequence. The air preheater 25 supplies air to a primary air supply port through a primary air system 19; the air preheater 25 supplies air to the first layer secondary air supply opening and the second layer secondary air supply opening through the secondary air system 20. The sludge dryer 3 is communicated with the third layer of secondary air supply port through a flue gas pipeline 22 and is used for introducing the clown gas generated by the sludge dryer 3 into the circulating fluidized bed boiler 16 for incineration treatment.
Preferably, the flue gas treatment unit comprises, connected in series: the device comprises a dust remover 26, an induced draft fan 27, a desulfurization system 28 and a chimney 29, wherein the smoke outlet of the boiler combustion unit is connected with the air inlet end of the dust remover 26. Flue gas generated by burning the sludge coal coke slurry is dedusted by the deduster 26, and desulfurized by the desulfurization system 28 and then is exhausted after being lifted by the chimney 29.
Example 2
Referring to fig. 2, on the basis of embodiment 1, the embodiment discloses a sludge drying pulping fluidized bed coupled combustion system, which includes: a sludge drying dehydration unit, a pulping slurry supply unit, a boiler combustion unit and a flue gas treatment unit.
The sludge drying and dehydrating unit is used for drying and dehydrating wet sludge raw materials; the pulping and slurry supplying unit is used for finishing pulping of sludge coal coke slurry of the dried sludge and supplying slurry to the boiler combustion unit; the boiler combustion unit is used for burning the sludge coal coke slurry; the flue gas treatment unit is used for cleaning flue gas generated by the boiler combustion unit.
The difference from example 1 is: in the sludge drying pulping fluidized bed coupled combustion system of the embodiment, the sludge dryer 3 generates high-temperature flue gas based on the boiler combustion unit to realize drying treatment of wet sludge.
Specifically, a plurality of air preheaters 25 are arranged in the tail flue 24, and preheated air is introduced into the circulating fluidized bed boiler 16; and the tail flue 24 is communicated with the sludge dryer 3 through a flue gas recirculation system 30, and the sludge drying treatment in the tail flue is completed by introducing flue gas into the sludge dryer 3.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a sludge drying slurrying fluidized bed coupling combustion system which characterized in that, coupling combustion system is including connecting gradually: a sludge drying and dehydrating unit, a pulping and slurry supplying unit, a boiler combustion unit and a flue gas treatment unit,
the sludge drying and dehydrating unit is used for drying and dehydrating wet sludge raw materials; the pulping and slurry supplying unit is used for finishing pulping of sludge coal coke slurry of the dried sludge and supplying slurry to the boiler combustion unit; the boiler combustion unit is used for burning the sludge coal coke slurry; the flue gas treatment unit is used for cleaning the flue gas generated by the boiler combustion unit.
2. The sludge drying and pulping fluidized bed coupled combustion system of claim 1, wherein the sludge drying and dewatering unit comprises: a sludge pool (1), a sludge conveyer (2), a sludge dryer (3) and a dry sludge conveyer (4),
the sludge tank (1) is connected with a sludge dryer (3) through a sludge conveyor (2), the sludge dryer (3) completes drying treatment of wet sludge, and the sludge dryer (3) is communicated with a pulping and slurry supply unit through a dry sludge conveyor (4).
3. The sludge drying pulping fluidized bed coupled combustion system of claim 2, wherein the pulping pulp supply unit comprises: a water storage tank (5), a medicament pool (6), a coal storage bin (7), a petroleum coke bin (8), a feeding machine (9), a grinding machine (10), a slurry filter (11), a sludge coal coke slurry conveyor (12) and a slurry storage tank (13);
the water storage tank (5), the medicament pool (6), the coal storage bin (7) and the petroleum coke bin (8) are respectively connected with a feeding machine (9), the feeding machine (9) is connected with a grinding machine (10), the discharge end of the dry sludge conveyor (4) is connected with the grinding machine (10), and the fully grinding and mixing of the dried sludge, coal and petroleum coke are completed through the grinding machine (10) to prepare sludge coal coke slurry;
the grinder (10) is connected with a slurry storage tank (13) through a slurry filter (11) and a sludge coal coke slurry conveyor (12) in sequence, and the slurry storage tank (13) is connected with a boiler combustion unit through a boiler front slurry supply system (15).
4. The coupled combustion system of sludge drying and pulping fluidized bed according to claim 3, wherein the stokehole slurry supply system (15) pumps the sludge coal coke slurry by a screw pump, and the sludge coal coke slurry is granulated by a granulator after being pumped to a fluidized bed feed port of a boiler combustion unit.
5. The sludge drying and pulping fluidized bed coupled combustion system as set forth in claim 3, characterized in that the slurry filter (11) is further connected with the sludge tank (1) for sending the sludge filtered by the slurry filter (11) to the sludge tank for secondary drying and secondary grinding by the grinder (10); and a slurry stirrer (14) for homogenizing the slurry is arranged on the slurry storage tank (13).
6. The sludge drying pulping fluidized bed coupled combustion system of claim 3, wherein the boiler combustion unit comprises: a circulating fluidized bed boiler (16), a cyclone separator (17), a tail flue (24) and an air preheater (25),
the bottom end of the circulating fluidized bed boiler (16) is connected with a stokehole slurry supply system (15) and receives granulated sludge coal coke slurry;
the cyclone separator (17) is arranged at the downstream of the circulating fluidized bed boiler (16), a material returning device (18) is arranged at the bottom ash particle outlet end of the cyclone separator (17), and the material returning device (18) is connected with the feeding end of the circulating fluidized bed boiler (16);
one end of the tail flue (24) is connected with the top end of the cyclone separator (17), and the other end of the tail flue is connected with the flue gas treatment unit.
7. The coupled combustion system of sludge drying pulping fluidized bed according to claim 6, characterized in that a plurality of air preheaters (25) are arranged in the tail flue (24), and preheated air is introduced into the circulating fluidized bed boiler (16) and the sludge dryer (3).
8. The coupled combustion system of the sludge drying pulping fluidized bed according to claim 6, characterized in that a plurality of air preheaters (25) are arranged in the tail flue (24), and preheated air is introduced into the circulating fluidized bed boiler (16);
and the tail flue (24) is communicated with the sludge dryer (3) through a flue gas recirculation system (30), and the sludge drying treatment in the tail flue is completed by introducing flue gas into the sludge dryer (3).
9. The coupled combustion system of sludge drying pulping fluidized bed according to claim 7 or 8, wherein the circulating fluidized bed boiler (16) is provided with a primary air supply port, a first layer secondary air supply port, a second layer secondary air supply port and a third layer secondary air supply port (23) from bottom to top in sequence,
the air preheater (25) supplies air to the primary air supply port through the primary air system (19); the air preheater (25) supplies air to the first layer secondary air supply opening and the second layer secondary air supply opening through a secondary air system (20); the sludge dryer (3) is communicated with the third layer of secondary air supply opening (23) through a flue gas pipeline (22) and is used for introducing the clown gas generated by the sludge dryer (3) into the circulating fluidized bed boiler (16) for incineration treatment.
10. The sludge drying pulping fluidized bed coupled combustion system of claim 1, wherein the flue gas treatment unit comprises, connected in sequence: the boiler comprises a dust remover (26), an induced draft fan (27), a desulfurization system (28) and a chimney (29), wherein the smoke exhaust port of the boiler combustion unit is connected with the air inlet end of the dust remover (26).
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| CN202211360858.XA CN115717704A (en) | 2022-11-02 | 2022-11-02 | Sludge drying slurrying fluidized bed coupling combustion system |
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| CN202211360858.XA CN115717704A (en) | 2022-11-02 | 2022-11-02 | Sludge drying slurrying fluidized bed coupling combustion system |
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| CN202211360858.XA Pending CN115717704A (en) | 2022-11-02 | 2022-11-02 | Sludge drying slurrying fluidized bed coupling combustion system |
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